CN118457124A

CN118457124A - Wheel type construction machine, suspension adjustment method for wheel type construction machine, and wheel load balancing method

Info

Publication number: CN118457124A
Application number: CN202410704913.5A
Authority: CN
Inventors: 张永亮; 张付义; 王志芳; 韩玉习; 郑国俊; 宋建军; 赵磊; 张程
Original assignee: Xuzhou Heavy Machinery Co Ltd
Current assignee: Xuzhou Heavy Machinery Co Ltd
Priority date: 2024-05-31
Filing date: 2024-05-31
Publication date: 2024-08-09

Abstract

The invention discloses a wheel type engineering machine, a suspension adjusting method and a wheel load balancing method, wherein the wheel type engineering machine comprises a suspension valve bank, the suspension valve bank comprises a suspension oil cylinder, the suspension valve bank further comprises a first control valve bank, an energy accumulator, a second control valve bank and a third control valve bank, the first control valve bank is used for controlling the connection or disconnection between a first cavity and a pressure oil port which are connected with the first control valve bank and an oil return port, the second control valve bank of the first suspension valve bank is connected with a second cavity and the pressure oil port of the suspension oil cylinder of the second suspension valve bank, the second control valve bank of the second suspension valve bank is connected with the second cavity and the pressure oil port of the suspension oil cylinder of the first suspension valve bank and the oil return port, the second cavity of the suspension oil cylinder of the first suspension valve bank is simultaneously connected with a pipeline between the third control valve bank of the second suspension valve bank and the overflow valve, and the pipeline between the third control valve bank of the suspension oil cylinder of the second suspension valve bank is simultaneously connected with the pipeline between the third control valve bank and the overflow valve of the first suspension valve bank.

Description

Wheel type construction machine, suspension adjustment method for wheel type construction machine, and wheel load balancing method

Technical Field

The invention relates to the technical field of engineering machinery, in particular to a wheel type engineering machine, a suspension adjusting method of the wheel type engineering machine and a wheel load balancing method.

Background

The suspension is a generic term for all force-transmitting connection devices between the frame (or the carrier body) and the axle (or wheels) of a vehicle, which function to transmit forces and torque between the wheels and the frame, and to cushion the impact forces transmitted to the frame or the body by the uneven road surface and to reduce the vibrations caused thereby, so as to ensure smooth running of the vehicle. The wheel type engineering machinery vehicles mostly adopt hydro-pneumatic suspension systems, and are composed of an energy accumulator, a suspension oil cylinder, a control valve for controlling hydro-pneumatic suspension posture and the like, and the main principle of the hydro-pneumatic suspension systems is that the suspension oil cylinder and the energy accumulator absorb vertical impact load in the running process of the engineering vehicles, so that hydraulic oil moves back and forth between a rodless cavity of the suspension oil cylinder and the energy accumulator through an oil way, and vibration reduction is achieved. The damping device has excellent nonlinear elastic characteristics and good damping performance, can well meet the smoothness requirement of the engineering vehicle, and is widely applied to engineering machinery wheeled vehicles. In addition to the wheel bearing and walking state on the ground, many wheel type engineering machines have a leg structure, and when the leg is borne on the ground, the wheel may be in a state of bearing less or not bearing. The suspension of the wheel type engineering machinery in the prior art is usually adjusted in a tire bearing state, the adjusting function is simpler, and the adjustment in a tire non-bearing state is not performed.

Disclosure of Invention

The invention aims to provide a wheel type engineering machine which can be adjusted for a suspension in a tire bearing state and a non-bearing state and has rich adjusting functions.

The first aspect of the invention discloses a wheel type engineering machine, comprising a controller and at least two wheel groups along a running direction, wherein the wheel groups comprise two wheels which are positioned on two opposite sides of the wheel type engineering machine along a direction perpendicular to the running direction, the wheel type engineering machine also comprises a plurality of suspension components which are respectively in one-to-one correspondence with the at least two wheel groups, the suspension components comprise two suspension valve groups which are respectively connected with the two wheels of the corresponding wheel groups in one-to-one correspondence, the suspension components comprise a pressure oil port for pumping hydraulic oil and an oil return port for returning oil to an oil tank, the suspension valve groups comprise suspension oil cylinders connected with the corresponding wheels, the suspension oil cylinders comprise a first cavity for feeding hydraulic oil to extend the suspension oil and a second cavity for feeding hydraulic oil to shorten the suspension oil cylinders, the suspension valve group further comprises a first control valve group which is connected with the controller in a signal way and is connected between the first cavity and the pressure oil port as well as the oil return port, an energy accumulator, a second control valve group which is connected with the controller in a signal way, an overflow valve which is connected between the energy accumulator and the oil return port as well as a third control valve group which is connected with the controller in a signal way and is connected between the overflow valve and the energy accumulator and is used for controlling the connection or disconnection of a pipeline where the overflow valve is located, the first control valve group is used for controlling the connection or disconnection of the first cavity and the pressure oil port which are connected with the first control valve group as well as the connection or disconnection of the first cavity and the oil return port which are connected with the first control valve group, the two suspension valve groups comprise a first suspension valve group and a second suspension valve group, the second control valve group of the first suspension valve group is connected with the second cavity of a suspension oil cylinder of the second suspension valve group as well as the pressure oil port and the oil return port, the second control valve group of the second suspension valve group is connected with the second cavity of the suspension cylinder of the first suspension valve group and the pressure oil port and the oil return port, so as to control the connection or disconnection between the second cavity connected with the second control valve group and the pressure oil port and the connection or disconnection between the second cavity connected with the second control valve group and the oil return port, and the second cavity of the suspension cylinder of the first suspension valve group is simultaneously connected with a pipeline between the third control valve group of the second suspension valve group and the overflow valve, and the second cavity of the suspension cylinder of the second suspension valve group is simultaneously connected with a pipeline between the third control valve group of the first suspension valve group and the overflow valve.

In some embodiments, the first control valve group comprises a first on-off valve and a second on-off valve, wherein the first on-off valve is used for controlling the connection or disconnection of a pipeline, the first on-off valve is connected between the first cavity and the pressure oil port, and the second on-off valve is connected between the first cavity and the oil return port; and/or the second control valve group comprises a third on-off valve and a fourth on-off valve which are used for controlling the connection or disconnection of a pipeline, the third on-off valve is connected between a second cavity connected with the second control valve group and the pressure oil port, and the second on-off valve is connected between a second cavity connected with the second control valve group and the oil return port.

In some embodiments, the suspension valve group further comprises a fourth control valve group connecting a pipeline between the accumulator and the third control valve group and the first cavity of the suspension cylinder, and the fourth control valve group is used for controlling communication or disconnection between the pipeline between the accumulator and the third control valve group and the first cavity of the suspension cylinder.

In some embodiments, the fourth control valve bank includes a fifth on-off valve having a first port connected to the first chamber, a second port connected to the line between the accumulator and the third control valve bank, a first fluid control port, and a second fluid control port, the fifth on-off valve having a first valve position where the first port and the second port are in communication, and a second valve position where the first port and the second port are out of communication, the first fluid control port being vented with a pressure fluid, the fifth on-off valve tending to switch to the first valve position, the second fluid control port being vented with a pressure fluid, the fifth on-off valve tending to switch to the second valve position.

In some embodiments, the first fluid control port of the first suspension valve group is in communication with the first fluid control port of the second suspension valve group and the second fluid control port of the first suspension valve group is in communication with the second fluid control port of the second suspension valve group.

In some embodiments, the suspension valve group further comprises a pressure detector in signal connection with the controller for detecting the pressure of hydraulic oil in the first or second chamber, the suspension assembly further comprises a fifth control valve group in signal connection with the controller for connecting the accumulator of the first suspension valve group and the accumulator of the second suspension valve group, the fifth control valve group being for controlling the communication or disconnection of a pipe between the accumulator of the first suspension valve group and the accumulator of the second suspension valve group.

In some embodiments, the effective pressure area of the hydraulic oil of the first chamber of the suspension cylinder of the two suspension valve groups is the same, and the effective pressure area of the hydraulic oil of the second chamber of the suspension cylinder of the two suspension valve groups is the same.

In some embodiments, the suspension cylinder single piston rod hydraulic cylinder, the first cavity is a rodless cavity, and the second cavity is a rod cavity.

The second aspect of the present invention discloses a suspension adjustment method using any one of the wheel type construction machines, comprising:

When wheels of the wheel set are grounded and the suspension corresponding to the wheel set needs to be stretched, a first control valve set of the suspension valve set is controlled, a first cavity of a suspension cylinder of the suspension valve set is communicated with the pressure oil port, and the first cavity of the suspension cylinder of the suspension valve set is disconnected with the oil return port, so that in the process: when a first elastic mode is required to be entered, controlling a second control valve group of the suspension valve group, disconnecting a second cavity of a suspension cylinder of the suspension valve group from the pressure oil port and the oil return port, and controlling a third control valve group to be communicated with a pipeline where the third control valve group is located; when a first rigid mode is required to be entered, controlling a second control valve group of the suspension valve group, disconnecting a second cavity connected with the second control valve group from the pressure oil port, connecting the second cavity connected with the second control valve group with the oil return port, and controlling the third control valve group to disconnect a pipeline where the third control valve group is located;

When wheels of the wheel set are grounded and a suspension corresponding to the wheel set needs to be shortened, a first control valve set of the suspension valve set is controlled, a first cavity of a suspension cylinder of the suspension valve set is disconnected from the pressure oil port, the first cavity of the suspension cylinder of the suspension valve set is communicated with the oil return port, a second control valve set of the suspension valve set is controlled, a second cavity connected with the second control valve set is disconnected from the pressure oil port and the oil return port, and a pipeline where the third control valve set is located is controlled to be communicated;

when wheels of the wheel set are all separated from the ground and a suspension corresponding to the wheel set needs to be shortened, controlling a second control valve set of the suspension valve set, enabling a second cavity connected with the second control valve set to be communicated with the pressure oil port, disconnecting the second cavity connected with the second control valve set from the oil return port, controlling a first control valve set of the suspension valve set, disconnecting a first cavity of a suspension oil cylinder of the suspension valve set from the pressure oil port, and enabling a first cavity of the suspension oil cylinder of the suspension valve set to be communicated with the oil return port;

When wheels of the wheel set are all separated from the ground and suspension of the wheel type engineering machinery is required to be stretched, a first control valve set of the suspension valve set is controlled, a first cavity of a suspension oil cylinder of the suspension valve set is communicated with the pressure oil port, the first cavity of the suspension oil cylinder of the suspension valve set is disconnected with the oil return port, and in the process: when a second elastic mode is needed to be entered, a second control valve group of the suspension valve group is controlled, so that a second cavity of a suspension cylinder of the suspension valve group is disconnected from the pressure oil port and the oil return port, and the third control valve group is controlled to be communicated with a pipeline where the third control valve group is located; when a second rigid mode is needed to be entered, a second control valve group of the suspension valve group is controlled, a second cavity connected with the second control valve group is disconnected with the pressure oil port, the second cavity connected with the second control valve group is communicated with the oil return port, and the third control valve group is controlled to disconnect a pipeline where the third control valve group is located.

The third aspect of the present invention discloses a suspension adjustment method using any one of the wheel type construction machines, comprising:

when wheels of the wheel set are grounded and a suspension corresponding to the wheel set needs to be stretched, a first control valve set of the suspension valve set is controlled, a first cavity of a suspension cylinder of the suspension valve set is communicated with the pressure oil port, the first cavity of the suspension cylinder of the suspension valve set is disconnected with the oil return port, a second control valve set of the suspension valve set is controlled, a second cavity connected with the second control valve set is disconnected with the pressure oil port, a second cavity connected with the second control valve set is communicated with the oil return port, and a pipeline where the third control valve set is located is controlled to be disconnected;

When wheels of the wheel set are grounded and a suspension corresponding to the wheel set needs to be shortened, a first control valve set of the suspension valve set is controlled, a first cavity of a suspension oil cylinder of the suspension valve set is disconnected from the pressure oil port, the first cavity of the suspension oil cylinder of the suspension valve set is communicated with the oil return port, a second control valve set of the suspension valve set is controlled, a second cavity connected with the second control valve set is disconnected from the pressure oil port and the oil return port, a pipeline where the third control valve set is positioned is controlled to be communicated, and a pipeline between the energy accumulator and the third control valve set is controlled to be communicated with the first cavity connected with the fourth control valve set;

When wheels of the wheel set are all separated from the ground and a suspension corresponding to the wheel set needs to be shortened, controlling a second control valve set of the suspension valve set, enabling a second cavity connected with the second control valve set to be communicated with the pressure oil port, enabling a second cavity connected with the second control valve set to be disconnected with the oil return port, controlling a first control valve set of the suspension valve set, enabling a first cavity of a suspension cylinder of the suspension valve set to be disconnected with the pressure oil port, enabling the first cavity of the suspension cylinder of the suspension valve set to be communicated with the oil return port, controlling a third control valve set to disconnect a pipeline where the third control valve set is located and controlling a fourth control valve set to disconnect a pipeline between the energy accumulator and the third control valve set from the first cavity connected with the fourth control valve set;

When wheels of the wheel set are grounded and the suspension of the wheel type engineering machinery is required to be stretched, a first control valve bank of the suspension valve bank is controlled, a first cavity of a suspension cylinder of the suspension valve bank is communicated with the pressure oil port, the first cavity of the suspension cylinder of the suspension valve bank is disconnected with the oil return port, a second control valve bank of the suspension valve bank is controlled, a second cavity connected with the second control valve bank is disconnected with the pressure oil port and communicated with the oil return port, a pipeline where the third control valve bank is located is controlled to be disconnected, and a pipeline between the energy accumulator and the third control valve bank is controlled to be disconnected with the first cavity connected with the fourth control valve bank.

The fourth aspect of the present invention discloses a wheel load balancing method for the wheel type engineering machine, comprising:

When the absolute value of the difference between the detection results of the pressure sensors of the first suspension valve bank and the pressure sensors of the second suspension valve bank is larger than a first threshold value, the first control valve bank and the second control valve bank of the first suspension valve bank and the second suspension valve bank are controlled firstly, so that the suspension cylinders of the first suspension valve bank and the second suspension valve bank are disconnected from the pressure oil port and the oil return port, then the third control valve bank of the first suspension valve bank and the third control valve bank of the second suspension valve bank is switched to a connected state and is disconnected after the first time, then the fifth control valve bank is switched to the connected state and the third control valve bank of the first suspension valve bank and the third control valve bank of the second suspension valve bank are switched to the connected state after the second time is kept, and the third control valve bank of the first suspension valve bank and the second suspension valve bank is switched to the disconnected state after the third time is kept.

Based on the wheel type engineering machine provided by the invention, the suspension can be adjusted in a ground bearing state or a non-bearing state of the wheel. When the wheels of the wheel set are grounded, when the suspension stretches, the elastic mode can be entered to adjust the suspension cylinder, so that the suspension cylinder is adjusted more stably, or the rigid mode is entered to adjust the suspension cylinder, so that the suspension cylinder is adjusted more quickly and rapidly. When the wheels of the wheel set are off the ground and not bearing, when the suspension stretches, the second elastic mode can be entered to adjust the suspension cylinder, so that the adjustment of the suspension cylinder is more stable, or the second rigid mode is entered to adjust the suspension cylinder, so that the adjustment of the suspension cylinder is more rapid.

Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:

Fig. 1 is a schematic structural view of a wheel type construction machine according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a suspension assembly of a wheeled work machine according to one embodiment;

fig. 3 is a schematic structural view of a suspension assembly of a wheel type construction machine according to another embodiment.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for defining the components, and are merely for convenience in distinguishing the corresponding components, and the terms are not meant to have any special meaning unless otherwise indicated, so that the scope of the present invention is not to be construed as being limited.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Spatially relative terms, such as "above … …," "above … …," "upper surface on … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The wheel type construction machine of the present embodiment includes a controller and at least two wheel sets in the traveling direction, and in the embodiment shown in the drawings, includes 7 wheel sets.

The wheel set includes two wheels located on opposite sides of the wheel type construction machine in a direction perpendicular to the traveling direction, the two wheels including a left wheel located on the left side of the driver in the cab and a right wheel located on the right side of the driver.

The wheel type engineering machinery further comprises a plurality of suspension components which are in one-to-one correspondence with at least two wheel groups, namely, each wheel group is provided with one suspension component in a matched mode, and one suspension component is used for controlling suspensions of two wheels of each wheel group.

The suspension assembly comprises two suspension valve groups connected with two wheels of the corresponding wheel set in a one-to-one correspondence respectively, the suspension assembly comprises a pressure oil port 11 for pumping hydraulic oil and an oil return port 12 for returning oil to an oil tank, the suspension valve groups comprise a suspension cylinder 2 connected with the corresponding wheels, the suspension cylinder 2 comprises a first cavity 21 for introducing hydraulic oil to extend the suspension cylinder 2 and a second cavity 22 for introducing hydraulic oil to shorten the suspension cylinder 2, and in the embodiment shown in the figure, the first cavity 21 is a rodless cavity, and the second cavity is a rod cavity.

The suspension valve group further comprises a first control valve group 31 which is in signal connection with the controller and is connected between the first cavity 21 and the pressure oil port 11 and the oil return port 12, an energy accumulator 41, a second control valve group 32 which is in signal connection with the controller, an overflow valve 43 which is connected between the energy accumulator 41 and the oil return port 12, and a third control valve group 33 which is in signal connection with the controller and is connected between the overflow valve 43 and the energy accumulator 41 and is used for controlling the connection or disconnection of a pipeline where the suspension valve group is located. The first control valve group 31 is connected between the first chamber 21 and the pressure port 11 and between the first chamber 21 and the oil return port 12. The first control valve group 31 is used for controlling the connection or disconnection between the first chamber 21 to which it is connected and the pressure port 11, and controlling the connection or disconnection between the first chamber 21 to which it is connected and the oil return port 12. The third control valve group 3 comprises an on-off valve which controls the connection or disconnection of the pipeline in which the third control valve group is positioned through the state change of connection or disconnection of the third control valve group.

The two suspension valve groups include a first suspension valve group and a second suspension valve group, and a second control valve group 32 of the first suspension valve group is connected with the second chamber 22 and the pressure oil port 11 of the suspension cylinder 2 of the second suspension valve group and the oil return port 12 for controlling the connection or disconnection between the second chamber 22 and the pressure oil port 11 connected thereto and the connection or disconnection between the second chamber 22 and the oil return port 12 connected thereto, and a second control valve group 32 of the second suspension valve group is connected with the second chamber 22 and the pressure oil port 11 and the oil return port 12 of the suspension cylinder 2 of the first suspension valve group for controlling the connection or disconnection between the second chamber 22 and the pressure oil port 11 connected thereto and the connection or disconnection between the second chamber 22 and the oil return port 12 connected thereto. Namely, one end of the second control valve group 32 of the first suspension valve group is connected with the pressure oil port 11 and the oil return port 12, and the other end of the second control valve group is connected with the second cavity 22 of the suspension cylinder 2 of the second suspension valve group, so that the second control valve group 32 of the first suspension valve group can control whether the second cavity 22 of the suspension cylinder 2 of the second suspension valve group is communicated with or disconnected from the pressure oil port 11, and can also control whether the second cavity 22 of the suspension cylinder 2 of the second suspension valve group is communicated with or disconnected from the oil return port 12. One end of a second control valve group 32 of the second suspension valve group is connected with the pressure oil port 11 and the oil return port 12, and the other end of the second control valve group is connected with the second cavity 22 of the suspension cylinder 2 of the first suspension valve group, so that the second control valve group 32 of the second suspension valve group can control whether the second cavity 22 of the suspension cylinder 2 of the first suspension valve group is communicated with or disconnected from the pressure oil port 11, and can also control whether the second cavity 22 of the suspension cylinder 2 of the first suspension valve group is communicated with or disconnected from the oil return port 12.

The second chamber 22 of the suspension cylinder 2 of the first suspension valve group is connected to the line between the third control valve group 33 of the second suspension valve group and the relief valve 43 at the same time, and the second chamber 22 of the suspension cylinder 2 of the second suspension valve group is connected to the line between the third control valve group 33 of the first suspension valve group and the relief valve 43 at the same time. I.e. the line between the third control valve group 33 of the second suspension valve group and the relief valve 43 is connected to the second chamber 22 of the suspension cylinder 2 of the first suspension valve group and the line between the third control valve group 33 of the first suspension valve group and the relief valve 43 is connected to the second chamber 22 of the suspension cylinder 2 of the second suspension valve group.

When the wheels of the wheel set are grounded and the corresponding suspension of the wheel set needs to be stretched, the first control valve group 31 of the suspension valve group is controlled, so that the first cavity 21 of the suspension cylinder 2 of the suspension valve group where the first control valve group 31 is positioned is communicated with the pressure oil port 11, and the first cavity 21 of the suspension cylinder 2 of the suspension valve group is disconnected with the oil return port 12. In this process: when the first elastic mode needs to be entered, the second control valve group 32 of the suspension valve group is controlled, the second cavity 22 of the suspension cylinder 2 of the suspension valve group connected with the second control valve group 32 is disconnected from the pressure oil port 11 and the oil return port 12, the third control valve group 33 is controlled to enable the pipeline where the third control valve group 33 is located to be communicated, at the moment, hydraulic oil output by the pressure oil port 11 enters the first cavity of the suspension cylinder of the first suspension valve group and the first cavity of the suspension cylinder of the second suspension valve group, the piston of the suspension cylinder of the first suspension valve group and the piston of the suspension cylinder of the second suspension valve group are pushed to extend, hydraulic oil in the second cavity of the suspension cylinder of the first suspension valve group and the second cavity of the suspension cylinder of the second suspension valve group is output, and then the hydraulic oil enters the accumulator of the second suspension valve group and the accumulator of the third control valve group of the first suspension valve group through the third control valve group of the second suspension valve group, and the buffer effect of the accumulator can enable the extension process of the suspension cylinder to be more stable. When the first rigid mode needs to be entered, the second control valve group 32 of the suspension valve group is controlled, the second cavity 22 connected with the second control valve group 32 is disconnected from the pressure oil port 11, the second cavity 22 connected with the second control valve group 32 is communicated with the oil return port 12, and the third control valve group 33 is controlled to disconnect a pipeline where the third control valve group is located; at this time, hydraulic oil output by the pressure oil port 11 enters a first cavity of a suspension cylinder of the first suspension valve bank and a first cavity of a suspension cylinder of the second suspension valve bank, a piston of the suspension cylinder of the first suspension valve bank and a piston of the suspension cylinder of the second suspension valve bank are pushed to extend, hydraulic oil in a second cavity of the suspension cylinder of the first suspension valve bank and a second cavity of the suspension cylinder of the second suspension valve bank is output, and then enters an oil return port through a second control valve bank of the second suspension valve bank and enters the oil return port through a second control valve bank of the first suspension valve bank respectively, so that the suspension cylinder can be rapidly stretched, and the suspension valve bank is more agile and efficient.

When the wheels of the wheel set are grounded and the corresponding suspensions of the wheel set are required to be shortened, the first control valve group 31 of the suspension valve group is controlled, the first cavity 21 of the suspension cylinder 2 of the suspension valve group is disconnected from the pressure oil port 11, the first cavity 21 of the suspension cylinder 2 of the suspension valve group is communicated with the oil return port 12, the second control valve group 32 of the suspension valve group is controlled, the second cavity 22 connected with the second control valve group 32 is disconnected from the pressure oil port 11 and the oil return port 12, and the third control valve group 33 is controlled to be communicated with a pipeline where the third control valve group 33 is located. In this embodiment, when the wheels are grounded, the suspension cylinder bears the gravity of the vehicle body, under the action of the gravity, the piston of the suspension cylinder is retracted, the pressure oil in the first cavity of the suspension cylinder is discharged to the oil return port 12 and returns to the oil tank, at this time, the second cavity of the suspension cylinder can obtain the oil supplement of the accumulator through the third control valve, the shrinkage of the suspension is stable, and in the embodiment shown in the figure, the second cavity of the suspension cylinder of the first suspension valve group obtains the oil supplement of the accumulator of the second suspension valve group through the third control valve of the second suspension valve group.

When wheels of the wheel set are all separated from the ground and the corresponding suspension of the wheel set needs to be shortened, controlling a second control valve set 32 of the suspension valve set, enabling a second cavity 22 connected with the second control valve set 32 to be communicated with a pressure oil port 11, enabling a second cavity 22 connected with the second control valve set 32 to be disconnected with an oil return port 12, controlling a first control valve set 31 of the suspension valve set, enabling a first cavity 21 of a suspension cylinder 2 of the suspension valve set to be disconnected with the pressure oil port 11, and enabling a first cavity 21 of the suspension cylinder 2 of the suspension valve set to be communicated with the oil return port 12; at this time, hydraulic oil output by the pressure oil port 11 enters a second cavity of a suspension cylinder of the first suspension valve bank and a second cavity of a suspension cylinder of the second suspension valve bank, so that a piston of the suspension cylinder of the first suspension valve bank and a piston of the suspension cylinder of the second suspension valve bank are pushed to extend, hydraulic oil in the second cavity of the suspension cylinder of the first suspension valve bank and the second cavity of the suspension cylinder of the second suspension valve bank is output, and then enters an oil return port through a second control valve bank of the second suspension valve bank and enters the oil return port through a second control valve bank of the first suspension valve bank respectively, so that the suspension cylinder can be rapidly stretched, and the suspension cylinder is more agile and efficient.

When wheels of the wheel set are all separated from the ground and a suspension of the wheel type engineering machinery is required to be stretched, a first control valve group 31 of the suspension valve group is controlled, a first cavity 21 of a suspension cylinder 2 of the suspension valve group is communicated with a pressure oil port 11, the first cavity 21 of the suspension cylinder 2 of the suspension valve group is disconnected with an oil return port 12, and in the process: when the second elastic mode needs to be entered, the second control valve group 32 of the suspension valve group is controlled, so that the second cavity 22 of the suspension cylinder 2 of the suspension valve group is disconnected from the pressure oil port 11 and the oil return port 12, and the third control valve group 33 is controlled to be communicated with a pipeline where the third control valve group is positioned; at this time, hydraulic oil output by the pressure oil port 11 enters a first cavity of a suspension cylinder of the first suspension valve bank and a first cavity of a suspension cylinder of the second suspension valve bank, a piston of the suspension cylinder of the first suspension valve bank and a piston of the suspension cylinder of the second suspension valve bank are pushed to extend, hydraulic oil in a second cavity of the suspension cylinder of the first suspension valve bank and a second cavity of the suspension cylinder of the second suspension valve bank is output, then the hydraulic oil enters an accumulator of the second suspension valve bank through a third control valve bank of the second suspension valve bank and an accumulator of the first suspension valve bank through a third control valve bank of the first suspension valve bank respectively, and the extension process of the suspension cylinder can be more stable due to the buffer effect of the accumulator. When the suspension valve set needs to enter the second rigid mode, the second control valve set 32 of the suspension valve set is controlled, the second cavity 22 connected with the second control valve set 32 is disconnected from the pressure oil port 11, the second cavity 22 connected with the second control valve set 32 is communicated with the oil return port 12, and the third control valve set 33 is controlled to disconnect a pipeline where the third control valve set is located. At this time, hydraulic oil output by the pressure oil port 11 enters a first cavity of a suspension cylinder of the first suspension valve bank and a first cavity of a suspension cylinder of the second suspension valve bank, a piston of the suspension cylinder of the first suspension valve bank and a piston of the suspension cylinder of the second suspension valve bank are pushed to extend, hydraulic oil in a second cavity of the suspension cylinder of the first suspension valve bank and a second cavity of the suspension cylinder of the second suspension valve bank is output, and then enters an oil return port through a second control valve bank of the second suspension valve bank and enters the oil return port through a second control valve bank of the first suspension valve bank respectively, so that the suspension cylinder can be rapidly stretched, and the suspension valve bank is more agile and efficient.

The wheel type construction machine according to the present embodiment can adjust the suspension in a state where the wheels are grounded or in a state where the wheels are not grounded. When the wheels of the wheel set are grounded, when the suspension stretches, the elastic mode can be entered to adjust the suspension cylinder 2, so that the adjustment of the suspension cylinder 2 is more stable, or the rigid mode is entered to adjust the suspension cylinder 2, so that the adjustment of the suspension cylinder 2 is more rapid. When the wheels of the wheel set are off the ground and not bearing, when the suspension stretches, the second elastic mode can be entered to adjust the suspension cylinder 2, so that the adjustment of the suspension cylinder 2 is more stable, or the second rigid mode is entered to adjust the suspension cylinder 2, so that the adjustment of the suspension cylinder 2 is more rapid. The wheel type engineering machinery of the embodiment can realize suspension adjustment in multiple modes, has rich adjusting functions and can adapt to more multi-working-condition requirements.

In some embodiments, the first control valve group 31 includes a first on-off valve 311 and a second on-off valve 312 for controlling on-off of a pipeline where the first on-off valve is connected between the first cavity 21 and the pressure oil port 11, and the second on-off valve is connected between the first cavity 21 and the oil return port 12, in the embodiment shown in the figure, the first on-off valve 311 and the second on-off valve 312 are two-position two-way electromagnetic on-off valves, the controller controls the first on-off valve 311 and the second on-off valve 312 to be powered on so as to achieve on-off of the pipeline where the first on-off valve 311 and the second on-off valve 312 are located, and the controller controls the first on-off valve 311 and the second on-off valve 312 to be powered off so as to achieve off of the pipeline where the first on-off valve 311 and the second on-off valve 312 are located. And/or the second control valve group 32 comprises a third on-off valve 321 and a fourth on-off valve 322 for controlling the connection or disconnection of the pipeline, the third on-off valve is connected between the second cavity 22 connected with the second control valve group 32 and the pressure oil port 11, and the second on-off valve is connected between the second cavity 22 connected with the second control valve group 32 and the oil return port 12. In the embodiment shown in the figure, the third three-way shut-off valve 321 and the fourth shut-off valve 322 are two-position two-way electromagnetic shut-off valves, the controller controls the third three-way shut-off valve 321 and the fourth shut-off valve 322 to be powered on so as to realize the communication of the pipelines where the third three-way shut-off valve 321 and the fourth shut-off valve 322 are located, and the controller controls the third three-way shut-off valve 321 and the fourth shut-off valve 322 to be powered off so as to realize the disconnection of the pipelines where the third three-way shut-off valve 321 and the fourth shut-off valve 322 are located.

In some embodiments, as shown in fig. 2 and 3, the suspension valve group further comprises a fourth control valve group 34 connecting the line between the accumulator 41 and the third control valve group 33 and the first chamber 21 of the suspension cylinder 2, the fourth control valve group 34 being used to control the communication or disconnection between the line between the accumulator 41 and the third control valve group 33 and the first chamber 21 of the suspension cylinder 2. In this embodiment, when the wheels of the wheel set are grounded and the suspension corresponding to the wheel set needs to be shortened, the first control valve set 31 of the suspension valve set can be controlled, the first cavity 21 of the suspension cylinder 2 of the suspension valve set is disconnected from the pressure oil port 11, the first cavity 21 of the suspension cylinder 2 of the suspension valve set is communicated with the oil return port 12, the second control valve set 32 of the suspension valve set is controlled, the second cavity 22 connected with the second control valve set 32 is disconnected from the pressure oil port 11 and the oil return port 12, the third control valve set 33 is controlled to be communicated with a pipeline where the third control valve set 33 is located, and the fourth control valve set 34 is controlled to be communicated with the first cavity 21 connected with the fourth control valve set 34. In this embodiment, when the wheels are grounded, the suspension cylinder bears the gravity of the vehicle body, under the action of the gravity, the piston of the suspension cylinder is retracted, a part of the pressure oil in the first cavity of the suspension cylinder flows into the second cavity of the suspension cylinder of the suspension valve group on the other side through the fourth control valve group 34 of the suspension valve group where the piston is located and the third control valve group 33 of the suspension valve group where the piston is located, so as to realize a differential oil path, thereby shortening the suspension cylinder more quickly and effectively, and the other part of the pressure oil in the first cavity of the suspension cylinder is discharged back to the oil tank through the oil return port 12.

In some embodiments, the fourth control valve bank 34 comprises a fifth on-off valve having a first port connected to the first chamber 21, a second port connected to the line between the accumulator 41 and the third control valve bank 33, a first fluid control port, and a second fluid control port, the fifth on-off valve having a first valve position in which the first port and the second port are in communication, and a second valve position in which the first port and the second port are disconnected, the first fluid control port being vented with pressure fluid, the fifth on-off valve tending to switch to the first valve position, the second fluid control port being vented with pressure fluid, the fifth on-off valve tending to switch to the second valve position. When the first fluid control port and the second fluid control port are hydraulic control ports, the pressure fluid is hydraulic oil, the fifth on-off valve is a two-position two-way hydraulic control on-off valve, and when the first fluid control port and the second fluid control port are pneumatic control ports, the pressure fluid is pressure gas, and the fifth on-off valve is a two-position two-way pneumatic control on-off valve.

In some embodiments, to better achieve the coordinated and synchronized action of the first and second suspension valve sets, as shown in fig. 2 and 3, the first fluid control port of the first suspension valve set communicates with the first fluid control port of the second suspension valve set, and the second fluid control port of the first suspension valve set communicates with the second fluid control port of the second suspension valve set.

In some embodiments, the suspension valve group further comprises a pressure detector 42 in signal connection with the controller for detecting the pressure of the hydraulic oil of the first chamber 21 or the second chamber 22, the suspension assembly further comprises a fifth control valve group 35 in signal connection with the controller and connecting the accumulator 41 of the first suspension valve group and the accumulator 41 of the second suspension valve group, the fifth control valve group 35 being for controlling the communication or disconnection of a pipe between the accumulator 41 of the first suspension valve group and the accumulator 41 of the second suspension valve group. As shown in fig. 3, in the present embodiment, when the absolute value of the difference between the detection results of the pressure sensors 42 of the first and second suspension valve groups is greater than the first threshold value, the first and second control valve groups 31 and 32 of the first and second suspension valve groups are first controlled, the suspension cylinders 2 of the first and second suspension valve groups are disconnected from both the pressure oil ports 11 and the oil return ports 12, then the third control valve groups 33 of the first and second suspension valve groups are switched to the communication state and are disconnected after the first time of the maintenance of the communication state, then the fifth control valve groups 35 are switched to the communication state and the third control valve groups 33 of the first and second suspension valve groups are switched to the communication state after the second time of the maintenance of the communication state, the third control valve group 33 of the first and second suspension valve groups is switched to the off state after being maintained in the on state for a third time. After leveling, when the absolute value of the difference between the detection results of the pressure sensor 42 of the first suspension valve group and the pressure sensor 42 of the second suspension valve group is greater than a first threshold, the first threshold is a pressure value obtained by means of experience, experiment, simulation design, and the like, and when the difference between the detection results is greater than the first threshold, the imbalance of the wheel loads of the two wheels of the wheel group is reflected. The suspension cylinders of the suspension assembly can now be pressure leveled using the steps described above. The suspension cylinders 2 of the first suspension valve group and the second suspension valve group are disconnected from the pressure oil port 11 and the oil return port 12, so that the pressure influence of the pressure oil port and the oil return port on the second cavity is avoided, when the third control valve group 33 of the two suspension valve groups is switched to a communication state, the two energy accumulators are respectively communicated with the second cavities of the two suspension cylinders, the two energy accumulators establish pressure balance with the second cavities of the two suspension cylinders after the first time passes, and then the third control valve group 33 is disconnected, so that the pressure of the two energy accumulators is kept. Then, the fifth control valve group 35 is switched to the communication state, and after a second time is spent in the communication state, the third control valve group 33 of the first suspension valve group and the second suspension valve group is switched to the communication state, and after a third time is spent in the communication state, the third control valve group 33 of the first suspension valve group and the second suspension valve group is switched to the disconnection state; with the communication of the fifth control valve group 35, the two accumulators are communicated, pressure balance is established between the two accumulators after the second time passes, then the two third control valve groups 33 are switched to a communication state, then the two accumulators for establishing pressure balance are simultaneously communicated with the second cavities of the two suspension cylinders, and after the third time passes, pressure balance is established, so that the two suspension cylinders are pressure balanced, the two third control valve groups 33 are switched to a disconnection state after the pressure balance is established, the two suspension cylinders are kept independent in oil cavity again, and at the moment, the hydraulic oil pressure in the oil cavity is balanced, and the two wheel loads of the wheel set are balanced. the first time, the second time and the third time are required for establishing balance, and can be designed according to experience, experiment, simulation design and other means.

The wheel-type engineering machine of this embodiment can determine whether the pressure of the suspension cylinders 2 of the wheels on both sides of the wheel set is too great by determining the difference between the detection results of the pressure sensor 42 of the first suspension valve set and the pressure sensor 42 of the second suspension valve set, that is, determine whether the wheel load is balanced, and when the pressure difference is too great, control and operate the first control valve set 31, the third control valve set 33, the fifth control valve set 35 and the second control valve set 32 of the first suspension valve set and the second suspension valve set through the controller, so that the accumulators 41 of the first suspension valve set and the second suspension valve set can obtain the pressure of the hydraulic oil of the two suspension cylinders 2, and perform pressure balance on the two suspension cylinders 2 after performing pressure balance between the two accumulators 41. Because the inflow or outflow volume of hydraulic oil required by pressure balance is small, the building reaction is quick, the two energy accumulators are utilized to perform pressure balance with the connected suspension cylinders respectively, then the pressure balance is built between the two energy accumulators, and the pressure balance is built with the two suspension cylinders through the energy accumulators, so that the building process of the pressure balance is more stable and reliable, the impact on the two suspension cylinders 2 in the pressure balance adjusting process is reduced, and the pressure balance adjustment of the two suspension cylinders 2 is more stable and effective.

In some embodiments, the effective pressure area of the hydraulic oil of the first chamber 21 of the suspension cylinders 2 of the two suspension valve groups is the same, and the effective pressure area of the hydraulic oil of the second chamber 22 of the suspension cylinders 2 of the two suspension valve groups is the same.

In some embodiments, the suspension cylinder 2 is a single piston rod hydraulic cylinder, the first chamber 21 being a rodless chamber and the second chamber 22 being a rod chamber.

In some embodiments, a suspension adjustment method of the wheel type engineering machine is further disclosed, including:

When wheels of the wheel set are grounded and the corresponding suspension of the wheel set needs to be stretched, the first control valve group 31 of the suspension valve group is controlled, so that the first cavity 21 of the suspension cylinder 2 of the suspension valve group is communicated with the pressure oil port 11, and the first cavity 21 of the suspension cylinder 2 of the suspension valve group is disconnected with the oil return port 12, and in the process: when the first elastic mode needs to be entered, the second control valve group 32 of the suspension valve group is controlled, so that the second cavity 22 of the suspension cylinder 2 of the suspension valve group is disconnected from the pressure oil port 11 and the oil return port 12, and the third control valve group 33 is controlled to be communicated with a pipeline where the third control valve group is positioned; when the first rigid mode needs to be entered, the second control valve group 32 of the suspension valve group is controlled, the second cavity 22 connected with the second control valve group 32 is disconnected from the pressure oil port 11, the second cavity 22 connected with the second control valve group 32 is communicated with the oil return port 12, and the third control valve group 33 is controlled to disconnect a pipeline where the third control valve group is located;

When wheels of the wheel set are grounded and the corresponding suspensions of the wheel set are required to be shortened, the first control valve group 31 of the suspension valve group is controlled, the first cavity 21 of the suspension cylinder 2 of the suspension valve group is disconnected from the pressure oil port 11, the first cavity 21 of the suspension cylinder 2 of the suspension valve group is communicated with the oil return port 12, the second control valve group 32 of the suspension valve group is controlled, the second cavity 22 connected with the second control valve group 32 is disconnected from the pressure oil port 11 and the oil return port 12, and the third control valve group 33 is controlled to be communicated with a pipeline where the third control valve group is positioned;

When wheels of the wheel set are all separated from the ground and the corresponding suspension of the wheel set needs to be shortened, controlling a second control valve set 32 of the suspension valve set, enabling a second cavity 22 connected with the second control valve set 32 to be communicated with a pressure oil port 11, enabling a second cavity 22 connected with the second control valve set 32 to be disconnected with an oil return port 12, controlling a first control valve set 31 of the suspension valve set, enabling a first cavity 21 of a suspension cylinder 2 of the suspension valve set to be disconnected with the pressure oil port 11, and enabling a first cavity 21 of the suspension cylinder 2 of the suspension valve set to be communicated with the oil return port 12;

When wheels of the wheel set are all separated from the ground and a suspension of the wheel type engineering machinery is required to be stretched, a first control valve group 31 of the suspension valve group is controlled, a first cavity 21 of a suspension cylinder 2 of the suspension valve group is communicated with a pressure oil port 11, the first cavity 21 of the suspension cylinder 2 of the suspension valve group is disconnected with an oil return port 12, and in the process: when the second elastic mode needs to be entered, the second control valve group 32 of the suspension valve group is controlled, so that the second cavity 22 of the suspension cylinder 2 of the suspension valve group is disconnected from the pressure oil port 11 and the oil return port 12, and the third control valve group 33 is controlled to be communicated with a pipeline where the third control valve group is positioned; when the suspension valve set needs to enter the second rigid mode, the second control valve set 32 of the suspension valve set is controlled, the second cavity 22 connected with the second control valve set 32 is disconnected from the pressure oil port 11, the second cavity 22 connected with the second control valve set 32 is communicated with the oil return port 12, and the third control valve set 33 is controlled to disconnect a pipeline where the third control valve set is located.

When wheels of the wheel set are grounded and the corresponding suspension of the wheel set needs to be stretched, a first control valve group 31 of the suspension valve group is controlled, a first cavity 21 of a suspension cylinder 2 of the suspension valve group is communicated with a pressure oil port 11, the first cavity 21 of the suspension cylinder 2 of the suspension valve group is disconnected from an oil return port 12, a second control valve group 32 of the suspension valve group is controlled, a second cavity 22 connected with the second control valve group 32 is disconnected from the pressure oil port 11, a second cavity 22 connected with the second control valve group 32 is communicated with the oil return port 12, and a third control valve group 33 is controlled to disconnect a pipeline where the third control valve group is positioned;

when wheels of the wheel set are grounded and the corresponding suspensions of the wheel set are required to be shortened, the first control valve group 31 of the suspension valve group is controlled, the first cavity 21 of the suspension cylinder 2 of the suspension valve group is disconnected from the pressure oil port 11, the first cavity 21 of the suspension cylinder 2 of the suspension valve group is communicated with the oil return port 12, the second control valve group 32 of the suspension valve group is controlled, the second cavity 22 connected with the second control valve group 32 is disconnected from the pressure oil port 11 and the oil return port 12, the third control valve group 33 is controlled to be communicated with a pipeline where the third control valve group 33 is located, and the fourth control valve group 34 is controlled to be communicated with the first cavity 21 connected with the fourth control valve group 34;

when wheels of the wheel set are all separated from the ground and the corresponding suspension of the wheel set needs to be shortened, controlling a second control valve bank 32 of the suspension valve bank, enabling a second cavity 22 connected with the second control valve bank 32 to be communicated with a pressure oil port 11, enabling a second cavity 22 connected with the second control valve bank 32 to be disconnected with an oil return port 12, controlling a first control valve bank 31 of the suspension valve bank, enabling a first cavity 21 of a suspension cylinder 2 of the suspension valve bank to be disconnected with the pressure oil port 11, enabling the first cavity 21 of the suspension cylinder 2 of the suspension valve bank to be communicated with the oil return port 12, controlling a third control valve bank 33 to disconnect a pipeline where the suspension valve bank is located and controlling a fourth control valve bank 34 to disconnect a pipeline between an accumulator 41 and the third control valve bank 33 from the first cavity 21 connected with the fourth control valve bank 34;

when wheels of the wheel set are grounded and the suspension of the wheel type engineering machinery needs to be stretched, the first control valve group 31 of the suspension valve group is controlled, the first cavity 21 of the suspension cylinder 2 of the suspension valve group is communicated with the pressure oil port 11, the first cavity 21 of the suspension cylinder 2 of the suspension valve group is disconnected from the oil return port 12, the second control valve group 32 of the suspension valve group is controlled, the second cavity 22 connected with the second control valve group 32 is disconnected from the pressure oil port 11 and communicated with the oil return port 12, the third control valve group 33 is controlled to disconnect a pipeline where the third control valve group 33 is located, and the fourth control valve group 34 is controlled to disconnect a pipeline between the accumulator 41 and the third control valve group 33 from the first cavity 21 connected with the fourth control valve group 34.

In some embodiments, a method for balancing the wheel load of a wheel-type engineering machine is also disclosed, including:

When the absolute value of the difference between the detection results of the pressure sensor 42 of the first suspension valve group and the pressure sensor 42 of the second suspension valve group is larger than the first threshold value, the first control valve group 31 and the second control valve group 32 of the first suspension valve group and the second suspension valve group are controlled first, the suspension cylinder 2 of the first suspension valve group and the second suspension valve group is disconnected from the pressure oil port 11 and the oil return port 12, then the third control valve group 33 of the first suspension valve group and the second suspension valve group is switched to the connected state and is disconnected after the first time, then the fifth control valve group 35 is switched to the connected state and the third control valve group 33 of the first suspension valve group and the second suspension valve group is switched to the connected state after the second time, and the third control valve group 33 of the first suspension valve group and the second suspension valve group is switched to the disconnected state after the third time.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.

Claims

1. The wheel type engineering machine is characterized by comprising a controller and at least two wheel groups along the running direction, wherein the wheel groups comprise two wheels which are positioned on two opposite sides of the wheel type engineering machine along the direction perpendicular to the running direction, the wheel type engineering machine further comprises a plurality of suspension components which are respectively in one-to-one correspondence with the at least two wheel groups, the suspension components comprise two suspension valve groups which are respectively connected with the two wheels of the corresponding wheel groups in one-to-one correspondence, the suspension components comprise a pressure oil port for pumping hydraulic oil and an oil return port for returning oil to an oil tank, the suspension valve groups comprise suspension oil cylinders connected with the corresponding wheels, the suspension oil cylinders comprise a first cavity for feeding hydraulic oil to extend the suspension oil cylinders and a second cavity for feeding hydraulic oil to shorten the suspension oil cylinders, the suspension valve group further comprises a first control valve group which is connected with the controller in a signal way and is connected between the first cavity and the pressure oil port as well as the oil return port, an energy accumulator, a second control valve group which is connected with the controller in a signal way, an overflow valve which is connected between the energy accumulator and the oil return port as well as a third control valve group which is connected with the controller in a signal way and is connected between the overflow valve and the energy accumulator and is used for controlling the connection or disconnection of a pipeline where the overflow valve is located, the first control valve group is used for controlling the connection or disconnection of the first cavity and the pressure oil port which are connected with the first control valve group as well as the connection or disconnection of the first cavity and the oil return port which are connected with the first control valve group, the two suspension valve groups comprise a first suspension valve group and a second suspension valve group, the second control valve group of the first suspension valve group is connected with the second cavity of a suspension oil cylinder of the second suspension valve group as well as the pressure oil port and the oil return port, the second control valve group of the second suspension valve group is connected with the second cavity of the suspension cylinder of the first suspension valve group and the pressure oil port and the oil return port, so as to control the connection or disconnection between the second cavity connected with the second control valve group and the pressure oil port and the connection or disconnection between the second cavity connected with the second control valve group and the oil return port, and the second cavity of the suspension cylinder of the first suspension valve group is simultaneously connected with a pipeline between the third control valve group of the second suspension valve group and the overflow valve, and the second cavity of the suspension cylinder of the second suspension valve group is simultaneously connected with a pipeline between the third control valve group of the first suspension valve group and the overflow valve.

2. The wheel type engineering machine as claimed in claim 1, wherein the first control valve group comprises a first on-off valve and a second on-off valve for controlling the connection or disconnection of a pipeline, the first on-off valve is connected between the first cavity and the pressure oil port, and the second on-off valve is connected between the first cavity and the oil return port; and/or the second control valve group comprises a third on-off valve and a fourth on-off valve which are used for controlling the connection or disconnection of a pipeline, the third on-off valve is connected between a second cavity connected with the second control valve group and the pressure oil port, and the second on-off valve is connected between a second cavity connected with the second control valve group and the oil return port.

3. The wheel type construction machine according to claim 1, wherein the suspension valve group further includes a fourth control valve group connecting a pipe between the accumulator and the third control valve group and the first chamber of the suspension cylinder, the fourth control valve group being for controlling communication or disconnection between the pipe between the accumulator and the third control valve group and the first chamber of the suspension cylinder.

4. A wheel-type construction machine according to claim 3, wherein the fourth control valve group includes a fifth on-off valve having a first port connected to the first chamber, a second port connected to a pipe between the accumulator and the third control valve group, a first fluid control port, and a second fluid control port, the fifth on-off valve having a first valve position at which the first port and the second port communicate, and a second valve position at which the first port and the second port are disconnected, the first fluid control port being supplied with a pressure fluid, the fifth on-off valve tending to switch to the first valve position, the second fluid control port being supplied with a pressure fluid, the fifth on-off valve tending to switch to the second valve position.

5. The wheel-type working machine according to claim 4, wherein the first fluid control port of the first suspension valve group and the first fluid control port of the second suspension valve group are communicated, and the second fluid control port of the first suspension valve group and the second fluid control port of the second suspension valve group are communicated.

6. A wheeled construction machine according to any one of claims 1 to 5, wherein the suspension valve group further comprises a pressure detector in signal connection with the controller for detecting the pressure of hydraulic oil in the first or second chamber, and the suspension assembly further comprises a fifth control valve group in signal connection with the controller for connecting the accumulator of the first suspension valve group and the accumulator of the second suspension valve group, the fifth control valve group being for controlling the connection or disconnection of a pipe between the accumulator of the first suspension valve group and the accumulator of the second suspension valve group.

7. The wheel type construction machine according to claim 6, wherein the effective pressure acting areas of the hydraulic oil of the first chambers of the suspension cylinders of the two suspension valve groups are identical, and the effective pressure acting areas of the hydraulic oil of the second chambers of the suspension cylinders of the two suspension valve groups are identical.

8. The wheel type engineering machine according to claim 6, wherein the suspension oil cylinder is a single piston rod hydraulic cylinder, the first cavity is a rodless cavity, and the second cavity is a rod cavity.

9. A suspension adjustment method using the wheel type construction machine according to any one of claims 1 to 8, comprising:

10. A suspension adjustment method using the wheel type construction machine according to any one of claims 3 to 5, comprising:

when wheels of the wheel set are all separated from the ground and a suspension of the wheel type engineering machinery is required to be stretched, a first control valve bank of the suspension valve bank is controlled, a first cavity of a suspension cylinder of the suspension valve bank is communicated with the pressure oil port, the first cavity of the suspension cylinder of the suspension valve bank is disconnected with the oil return port, a second control valve bank of the suspension valve bank is controlled, a second cavity connected with the second control valve bank is disconnected with the pressure oil port and communicated with the oil return port, a pipeline where the third control valve bank is located is controlled to be disconnected, and a pipeline between the energy accumulator and the third control valve bank is controlled to be disconnected with the first cavity connected with the fourth control valve bank.

11. A method of equalizing the wheel load of the wheel type construction machine according to claim 6 or 7, comprising: