CN211231059U - Digital hydraulic leveling system of working platform of overhead working truck - Google Patents
Digital hydraulic leveling system of working platform of overhead working truck Download PDFInfo
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Abstract
The utility model provides a digital hydraulic leveling system of a working platform of an overhead working truck, which comprises an oil supply unit, a leveling sensor, a stepping motor, a digital leveling cylinder and a digital valve; the oil supply unit comprises an oil supply main pipe and an oil return main pipe; the leveling sensor is used for detecting the inclination of the working platform; a rotating shaft of the stepping motor rotates according to the inclination angle value detected by the leveling sensor; a cylinder rod of the digital leveling cylinder is connected with the working platform; when the cylinder rod extends and retracts along the digital leveling cylinder, the inclination angle of the working platform is driven to change; the digital valve comprises a pressure oil port P0, an oil return port T0, a working oil port A0 and a working oil port B0; the pressure oil port P0 is communicated with an oil supply main pipe, the oil return port T0 is communicated with an oil return main pipe, the working oil port A0 is communicated with a rod cavity, and the working oil port B0 is connected with a rodless cavity; the rotating shaft of the stepping motor is connected with the valve core of the digital valve, and the digital valve is driven to change direction when the rotating shaft of the stepping motor rotates. The utility model realizes the precise stable control of the automatic leveling of the working platform; and can manual emergent standby control, the security is high.
Description
Technical Field
The utility model relates to an engineering machine tool hydraulic control equipment field especially relates to an aerial working car work platform's digital hydraulic pressure leveling system.
Background
The leveling technology of the working platform is one of the key technologies of the high-altitude operation vehicle, and directly influences the safety of operators, the flexibility of operation, the adaptability of environment and other performances. The leveling modes of the working platform of the overhead working truck mainly comprise a mechanical type leveling mode, a hydrostatic type leveling mode, an electro-hydraulic proportional type leveling mode and the like, the mechanical type leveling mode and the hydrostatic type leveling mode are mainly used for folding arm type and telescopic arm type overhead working trucks, and the electro-hydraulic proportional type leveling mode is mostly applied to high-altitude and complex hybrid arm overhead working trucks.
The existing high-altitude operation vehicle adopts a traditional electro-hydraulic proportional leveling mode, mainly adopts an open-loop control mode of proportional valve control, is provided with a balance valve on an oil cylinder, and has the following problems: the electric control needs to carry out proportional control (P control), proportional plus integral control (PI control) and proportional plus integral plus derivative control (PID) on an error signal between input and output, and the PID adjustment of an electric control parameter is difficult; the proportional valve control system has high requirement on the cleanliness of oil, and the oil can cause shaking faults due to pollution; the arm frame is at different positions and different speeds, the load change is large, the opening of a balance valve on an oil cylinder is greatly influenced by the load change, in addition, the leveling of the platform is greatly influenced by large temperature difference change of an oil temperature environment and the like, and the platform is easy to generate faults of shaking, overshoot or lag, large start-stop impact and the like in the leveling process.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides an aerial work car work platform's digital hydraulic pressure leveling system has realized aerial work car work platform automatic leveling's accurate stable control to can manual emergent stand-by control, the security is high.
The technical scheme is as follows: the utility model provides an aerial working car work platform's digital hydraulic pressure leveling system, include
An oil supply unit; the oil supply unit comprises an oil supply main pipe and an oil return main pipe;
the leveling sensor is used for detecting the inclination of the working platform;
a stepping motor; a rotating shaft of the stepping motor rotates according to the inclination angle value detected by the leveling sensor;
a digital leveling cylinder; a cylinder rod of the digital leveling cylinder is connected with the working platform; an oil cavity at one side of the digital leveling cylinder, where a cylinder rod is located, is a rod cavity, and an oil cavity at the other side is a rodless cavity; when the cylinder rod stretches along the digital leveling cylinder, the inclination angle of the working platform is driven to change;
a digital valve; the digital valve comprises a pressure oil port P0, an oil return port T0, a working oil port A0 and a working oil port B0; the pressure oil port P0 is communicated with an oil supply main pipe, the oil return port T0 is communicated with an oil return main pipe, the working oil port A0 is communicated with a rod cavity, and the working oil port B0 is connected with a rodless cavity; and a rotating shaft of the stepping motor is connected with a valve core of the digital valve, and the rotating shaft of the stepping motor drives the digital valve to change direction when rotating.
Further, the device also comprises an electromagnetic valve II; the electromagnetic valve II comprises a pressure oil port P2, an oil return port T2, a working oil port A2 and a working oil port B2; the pressure oil port P2 is communicated with an oil supply main pipe, the oil return port T2 is communicated with an oil return main pipe, the working oil port A2 is communicated with a rod cavity, and the working oil port B2 is communicated with a rodless cavity;
when the pressure oil port P2 is communicated with the working oil port A2, the oil return port T2 is communicated with the working oil port B2; when the pressure port P2 is communicated with the working port B2, the return port T2 is communicated with the working port a 2.
Further, the second solenoid valve is provided with a second manual emergency positioning knob and used for manual reversing of the second solenoid valve.
Furthermore, a solenoid valve I for stopping the flow of hydraulic oil is disposed on a hydraulic line connecting the pressure port P0 and the return port T0.
Furthermore, a hydraulic control one-way valve is arranged on a pipeline at the hydraulic oil interface of the rod cavity and/or the rodless cavity; the hydraulic control one-way valve comprises an oil inlet V, an oil outlet C and a control oil port K; the oil inlet V is communicated with one side of the digital valve, the oil outlet C is communicated with one side of the digital leveling cylinder, and the control oil port K is communicated with a hydraulic pipeline at a pressure oil port P0;
the solenoid valve I comprises a pressure oil port P1, an oil return port T1, a working oil port A1 and a working oil port B1; the pressure oil port P1 can be communicated with a working oil port A1, and the oil return port T1 can be communicated with a working oil port B1; solenoid valve I is provided with first manual emergent location knob for solenoid valve I manual switching-over.
Further, the device also comprises an electromagnetic valve III and an electromagnetic valve IV;
the solenoid valve III comprises a working oil port A3, a working oil port B3 and a working oil port C3; the working oil port A3 and the working oil port B3 can be respectively communicated with the working oil port C3; the working oil port A3 is communicated with a working oil port A0, the working oil port B3 is communicated with a working oil port A2, and the working oil port C3 is communicated with a rod cavity;
the solenoid valve IV comprises a working oil port A4, a working oil port B4 and a working oil port C4; the working oil port A4 and the working oil port B4 can be respectively communicated with the working oil port C4; the working oil port A4 is communicated with a working oil port B0, the working oil port B4 is communicated with a working oil port B2, and the working oil port C4 is communicated with a rodless cavity.
Further, a throttle valve I is arranged between the working oil port B3 and the working oil port A2; and a throttle valve II is arranged between the working oil port B4 and the working oil port B2.
Further, the electromagnetic valve I is a two-position four-way middle-position H-shaped spring reset single electromagnetic valve; the electromagnetic valve II is a spring reset double electromagnetic valve of a three-position four-way middle position O type; and the solenoid valve III and the solenoid valve IV are both two-position three-way spring reset single solenoid valves.
Furthermore, an overflow valve used for relieving pressure of the oil supply main pipe is arranged between the oil supply main pipe and the oil return main pipe.
Further, the device also comprises a rotary table structure, a main arm variable amplitude oil cylinder, a crank arm variable amplitude oil cylinder and a working platform; the rotary table structure is hinged with the main arm through a pin shaft; one end of the main arm derricking oil cylinder is hinged with the rotary table structure through a pin shaft, and the other end of the main arm derricking oil cylinder is hinged with the main arm through a pin shaft;
one end of the crank arm is connected with the tail end of the main arm through a first connecting rod mechanism, and the other end of the crank arm is connected with the working platform through a second connecting rod mechanism; one end of the crank arm variable amplitude oil cylinder is hinged to the inner side of the main arm through a pin shaft, and the other end of the crank arm variable amplitude oil cylinder is hinged to a first connecting rod mechanism between the crank arm and the main arm through a pin shaft;
the cylinder bottom at one side of the rodless cavity of the digital leveling cylinder is hinged with the crank arm through a pin shaft, and the cylinder rod of the digital leveling cylinder is hinged with a second connecting rod mechanism between the working platform and the crank arm through a pin shaft.
Has the advantages that: the utility model discloses a leveling sensor's signal, step motor rotary motion drive digital valve case operation opens the valve port, makes system pressure oil get into the rodless chamber of digital leveling jar or the pole chamber of digital leveling jar through the digital valve. When the cylinder rod extends or retracts, the digital leveling cylinder internal mechanical feedback mechanism pushes the digital valve core to move back until the opened valve port is closed, the profiling of the hydraulic cylinder linear movement to the motor rotation angle is completed, the torque amplification is realized in the process, and the servo system with the mechanical feedback is provided. According to the digital cylinder control mechanism, the number of the electric pulse signals of the digital valve corresponds to the stroke of the digital leveling cylinder, the frequency of the electric pulse signals of the digital valve corresponds to the speed of the digital leveling cylinder, and the angle signal electric control system detected by the leveling sensor can control the number and the frequency of the corresponding pulse signals of the digital valve so as to realize the position control and the speed control of the digital leveling cylinder. Thereby realizing the accurate leveling of the working platform. The structure realizes the servo control of the mechanical-hydraulic closed loop of micron-scale precision control of the working platform, the leveling control system is digital control, the control system is greatly simplified, the response speed is high, the control precision is high, and the stability is high. And the utility model discloses can also manual emergent standby control, improve the security.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural diagram of the stepping motor, the digital leveling cylinder, the digital valve, the electromagnetic valve iii 304 and the electromagnetic valve iv of the present invention;
fig. 3 is the structure schematic diagram of the mechanical arm and the working platform of the middle and high altitude operation vehicle of the utility model.
Detailed Description
As shown in fig. 3, the digital hydraulic leveling system for the working platform of the aerial work platform comprises a rotary table structure 1, a main arm 2, a main arm luffing cylinder 3, a crank arm 4, a crank arm luffing cylinder 5, a working platform 6, an electric control system 7 and a leveling sensor 8 for detecting the inclination of the working platform 6.
The rotary table structure 1 is hinged with the main arm 2 through a pin shaft; one end of the main arm luffing cylinder 3 is hinged with the rotary table structure 1 through a pin shaft, and the other end of the main arm luffing cylinder 3 is hinged with the main arm 2 through a pin shaft.
One end of the crank arm 4 is connected with the tail end of the main arm 2 through a first link mechanism, and the other end of the crank arm 4 is connected with the working platform 6 through a second link mechanism. One end of the crank arm variable amplitude oil cylinder 5 is hinged to the inner side of the main arm 2 through a pin shaft, and the other end of the crank arm variable amplitude oil cylinder 5 is hinged to a first connecting rod mechanism between the crank arm 4 and the main arm 2 through a pin shaft.
When the main arm 2 of the working arm is lifted, the rodless cavity of the main arm amplitude variation cylinder 3 takes oil, the cylinder rod of the main arm amplitude variation cylinder 3 extends outwards to drive the main arm to lift, and the working platform 6 can tilt forwards; when the main arm 2 of the working arm descends, the rod cavity of the main arm amplitude variation cylinder 3 takes oil, the cylinder rod of the main arm amplitude variation cylinder 3 retracts to drive the main arm to descend, and the working platform 6 can incline backwards. The leveling sensor 8 can detect the forward and backward tilting movements of the work platform 6.
The utility model also comprises an oil supply unit; the oil supply unit comprises an oil pump 9 and an oil tank; an oil inlet of the oil pump 9 is connected with an oil tank, and an oil outlet of the oil pump is connected with an oil supply main pipe to supply oil to the digital hydraulic leveling system; and return oil of the digital hydraulic leveling system flows back to the oil tank along the return oil main pipe. An overflow valve 11 used for relieving the pressure of the oil supply main pipe is arranged between the oil supply main pipe and the oil return main pipe. The oil outlet of the oil pump 9 is also provided with a one-way valve 10
As shown in fig. 1 and 2, the present invention further includes a stepping motor 303, a digital leveling cylinder 301, and a digital valve 302. The stepping motor 303 and the digital valve 302 are integrally mounted on a cylinder bottom block of the digital leveling cylinder 301.
The rotating shaft of the stepping motor 303 rotates according to the inclination angle value detected by the leveling sensor 8.
The cylinder rod of the digital leveling cylinder 301 is connected with the working platform 6; an oil cavity at one side of the digital leveling cylinder 301, where a cylinder rod is located, is a rod cavity, and an oil cavity at the other side is a rodless cavity. The cylinder bottom of one side of the rodless cavity of the digital leveling cylinder 301 is hinged with the crank arm 4 through a pin shaft, and the cylinder rod of the digital leveling cylinder 301 is hinged with a second connecting rod mechanism between the working platform 6 and the crank arm 4 through a pin shaft. When the cylinder rod extends and retracts along the digital leveling cylinder 301, the inclination angle of the working platform 8 is driven to change.
The digital valve 302 comprises a pressure oil port P0, an oil return port T0, a working oil port A0 and a working oil port B0; the pressure oil port P0 is communicated with an oil supply main pipe, the oil return port T0 is communicated with an oil return main pipe, the working oil port A0 is communicated with a rod cavity, and the working oil port B0 is connected with a rodless cavity; the rotating shaft of the stepping motor 303 is connected with the valve core of the digital valve 302, and the rotating shaft of the stepping motor 303 drives the digital valve 302 to change direction when rotating.
The leveling sensor 8 detects an inclined angle signal of the working platform and feeds the inclined angle signal back to the electronic control system 7, the electronic control system 7 controls the running direction of the stepping motor 303 to rotate clockwise or reversely according to the fact that an inclined angle value detected by the leveling sensor 8 is a positive value or a negative value, the stepping motor 303 rotates to drive the valve core of the digital valve 302 to run to generate axial leftward movement or rightward movement, a valve port is opened, and system pressure oil enters a rodless cavity of the digital leveling cylinder 301 or a rod cavity of the digital leveling cylinder through the digital valve 302. Meanwhile, when the cylinder rod extends or retracts, the mechanical feedback mechanism in the digital leveling cylinder 301 pushes the valve core of the digital valve 302 to move back until the opened valve port is closed, so that the profiling of the linear movement of the hydraulic cylinder on the rotation angle of the motor is completed, the torque amplification is realized in the process, and the servo system with the mechanical feedback is provided. According to the digital cylinder control mechanism, the number of the electric pulse signals of the digital valve 302 corresponds to the stroke of the digital leveling cylinder 301, the frequency of the electric pulse signals of the digital valve 302 corresponds to the speed of the digital leveling cylinder 301, and the angle signal electric control system 7 detected by the leveling sensor 8 can control the number and the frequency of the corresponding pulse signals of the digital valve 302 to realize the position control and the speed control of the digital leveling cylinder 301, so that the accurate leveling of the working platform 6 is realized.
As shown in fig. 1, an electromagnetic valve I201 for stopping the flow of hydraulic oil is disposed on a hydraulic pipeline connecting a pressure port P0 and a connection oil return port T0, and the electromagnetic valve I201 is preferably a two-position four-way middle H-shaped spring-return single-electromagnetic valve. The solenoid valve I201 comprises a pressure oil port P1, an oil return port T1, a working oil port A1 and a working oil port B1; the pressure port P1 may communicate with the working port a1, and the oil return port T1 may communicate with the working port B1. When the leveling operation is not needed, the electromagnetic valve I201 is closed, the pressure oil port P0 and the oil return port T0 of the digital valve 302 are isolated from being communicated with the outside, and oil pressure leakage is prevented. The solenoid valve i201 may be two solenoid valves provided on the hydraulic line connecting the pressure port P0 and the return port T0, respectively.
The utility model discloses still include solenoid valve II 202, solenoid valve II 202 is the two solenoid valves of spring return of the preferred tribit cross meso position O type. The electromagnetic valve II 202 comprises a pressure oil port P2, an oil return port T2, a working oil port A2 and a working oil port B2; the pressure oil port P2 is communicated with an oil supply main pipe, the oil return port T2 is communicated with an oil return main pipe, the working oil port A2 is communicated with a rod cavity, and the working oil port B2 is communicated with a rodless cavity; when the pressure oil port P2 is communicated with the working oil port A2, the oil return port T2 is communicated with the working oil port B2; when the pressure port P2 is communicated with the working port B2, the return port T2 is communicated with the working port a 2. When the digital valve 302 fails, the electromagnetic valve II 202 is reversed to realize the leveling of the working platform 6.
The utility model discloses still include solenoid valve III 304 and solenoid valve IV 305, solenoid valve III 304 and solenoid valve IV 305 are preferably two tee bend spring single solenoid valves that reset.
The solenoid valve III 304 comprises a working oil port A3, a working oil port B3 and a working oil port C3; the working oil port A3 and the working oil port B3 can be respectively communicated with the working oil port C3; the working oil port A3 is communicated with a working oil port A0, the working oil port B3 is communicated with a working oil port A2, and the working oil port C3 is communicated with a rod cavity.
The solenoid valve IV 305 comprises a working oil port A4, a working oil port B4 and a working oil port C4; the working oil port A4 and the working oil port B4 can be respectively communicated with the working oil port C4; the working oil port A4 is communicated with a working oil port B0, the working oil port B4 is communicated with a working oil port B2, and the working oil port C4 is communicated with a rodless cavity.
And two valve positions of the electromagnetic valve III 304 and the electromagnetic valve IV 305 in reversing are adopted, wherein one valve position can conduct the digital valve 302 and the digital leveling cylinder 301, and the other valve position can conduct the electromagnetic valve II 202 and the digital leveling cylinder 301, so that the leveling of the working platform 6 is realized by operating the digital valve 302 or the electromagnetic valve II 202 respectively.
A throttle valve I203 is arranged between the working oil port B3 and the working oil port A2; and a throttle valve II 204 is arranged between the working oil port B4 and the working oil port B2. The throttle valve I203 and the throttle valve II 204 are flow control valves, and when leveling operation is performed through the electromagnetic valve II 202, the cylinder rod of the digital leveling cylinder 301 can be slowly extended or retracted, so that manual backward tilting or forward tilting leveling action of the working platform 6 can be slowly controlled, and the leveling safety of the working platform 6 is ensured.
A hydraulic control one-way valve 306 is also arranged on a pipeline at the hydraulic oil interface of the rod cavity and/or the rodless cavity; the hydraulic control one-way valve 306 comprises an oil inlet V, an oil outlet C and a control oil port K; the oil inlet V is communicated with one side of the digital valve 302, the oil outlet C is communicated with one side of the digital leveling cylinder 301, and the control oil port K is communicated with a hydraulic pipeline at a pressure oil port P0. When a hydraulic system has faults such as pipe explosion, power failure and the like of a hydraulic pipeline, the hydraulic control one-way valve 306 is used for maintaining the oil pressure of the digital leveling cylinder 301, preventing the working platform from inclining and improving the safety. The pilot operated check valve 306 is preferably installed in a line on the side where the hydraulic oil of the digital leveling cylinder 301 is pressed out when the work platform 6 is inclined by its own weight. In this embodiment, when the working platform 6 is inclined due to its own weight, the cylinder rod moves downward, and the hydraulic oil in the rod chamber is pressed out, so that the hydraulic control check valve 306 is installed on the pipeline at the hydraulic oil interface of the rod chamber.
As shown in fig. 2, the solenoid valve iii 304, the solenoid valve iv 305, and the pilot operated check valve 306 are integrally mounted on a valve seat of the digital valve 302.
The utility model discloses a digit hydraulic pressure leveling working process as follows: when the rodless cavity of the main arm luffing cylinder 3 enters pressure oil, the cylinder rod of the main arm luffing cylinder 3 extends outwards to drive the main arm 1 to lift, the working platform 6 can tilt forwards, the leveling sensor 8 at the bottom surface of the bracket of the working platform 6 detects the tilting angle signal of the working platform and feeds back the tilting angle signal to the electronic control system 7, the electronic control system 7 takes a positive value according to the tilting angle value detected by the leveling sensor 8, the electronic control system 7 drives the stepping motor 303 to rotate to drive the valve core of the digital valve 302 to rotate and move axially rightwards, the valve port of the digital valve 302 is opened, meanwhile, the electric control system 7 enables the electromagnetic valve I201, the electromagnetic valve III 304 and the electromagnetic valve IV 305 to be electrified, pressure oil from the hydraulic pump 9 enters a rodless cavity of the digital leveling cylinder 301 through the electromagnetic valve I201, the digital valve 302 and the electromagnetic valve IV 305, a cylinder rod of the digital leveling cylinder 301 extends outwards to drive the working platform 6 to lean backwards to realize automatic leveling, and the oil path is as follows: fuel supply manifold → P1 → A1 → P0 → B0 → A4 → C4 → rodless cavity; the oil liquid in the rod cavity of the digital leveling cylinder 301 returns to the oil tank through the hydraulic control one-way valve 306, the electromagnetic valve III 304, the digital valve 302 and the electromagnetic valve I201, and the oil liquid path is as follows: rod cavity → C → V → C3 → A3 → A0 → T0 → B1 → T1 → oil return manifold.
When pressure oil enters a rod cavity of the main arm amplitude cylinder 3, a cylinder rod of the main arm amplitude cylinder 3 retracts to drive the main arm 1 to descend, the working platform 6 can tilt backwards, the leveling sensor 8 on the bottom surface of the bracket of the working platform 6 detects an inclined angle signal of the working platform and feeds the inclined angle signal back to the electronic control system 7, the electronic control system 7 takes a negative value according to the inclined angle value detected by the leveling sensor 8, the electronic control system 7 drives the stepping motor 303 to rotate to drive the valve core of the digital valve 302 to operate and move axially leftwards, the valve port of the digital valve 302 is opened, meanwhile, the electronic control system 7 enables the electromagnetic valves I201, III 304 and IV 305 to be powered, the pressure oil from the hydraulic pump 9 enters the rod cavity of the digital leveling cylinder 301 through the electromagnetic valve I201, the digital valve 302, the electromagnetic valve III 304 and the hydraulic control one-way valve 306, the digital leveling cylinder 301 retracts to drive, the oil path is as follows: fuel supply manifold → P1 → a1 → P0 → a0 → A3 → C3 → V → C → rod cavity; oil in the rodless cavity of the digital leveling cylinder 301 returns to an oil tank through an electromagnetic valve IV 305, a digital valve 302 and an electromagnetic valve I201, and the oil path is as follows: rodless cavity → C4 → A4 → B0 → T0 → B1 → T1 → oil return manifold.
When the crank arm 4 rises or falls to drive the working platform 6 to tilt forwards or backwards, the working mechanism of the electric control system 7, the leveling sensor 8 and the digital leveling cylinder 301 which jointly realize the automatic leveling of the working platform is the same as that of the main arm 2, and the details are not repeated here.
The utility model discloses realize aerial working car work platform's auto leveling, but the inevitable meeting of control system has the risk of breaking down.
In order to further improve the safety, the electromagnetic valve I201 is provided with a first manual emergency positioning knob for manual reversing of the electromagnetic valve I201; the second solenoid valve II 202 is provided with a second manual emergency positioning knob and used for manual reversing of the second solenoid valve II 202.
When faults such as power loss and the like cannot be automatically leveled, the digital leveling cylinder 301 can be converted into a common hydraulic cylinder to carry out full-hydraulic manual emergency operation through full-hydraulic manual operation control of the solenoid valve I201, the solenoid valve II 202, the solenoid valve III 304 and the solenoid valve IV 305, and manual leveling of the working platform 6 is realized.
The working process of manual leveling is as follows: when the working platform 6 needs to be manually tilted forwards to realize manual adjustment, valve heads of the electromagnetic valve I201, the electromagnetic valve II 202, the electromagnetic valve III 304 and the electromagnetic valve IV 305 are all in a power-off state; and (3) manually reversing to adjust the valve positions of the electromagnetic valve I201 and the electromagnetic valve II 202, and enabling pressure oil from the hydraulic pump 9 to enter a rod cavity of the digital leveling cylinder 301 through the electromagnetic valve II 202, the throttle valve I203, the hydraulic control electromagnetic valve III 304 and the hydraulic control one-way valve 306 so as to enable the cylinder rod to retract slowly. The oil path is as follows: oil supply manifold → P2 → A2 → B3 → C3 → V → C → rod cavity; the oil in the rodless cavity of the digital leveling cylinder 301 returns to the oil tank through an electromagnetic valve IV 305, a throttle valve II 204 and an electromagnetic valve II 202, and the oil path is as follows: the rodless cavity → C4 → B4 → B2 → T2 → oil return header pipe, which realizes the manual forward tilt leveling of the working platform 6. After the manual leveling is finished, the solenoid valve I201 and the solenoid valve II 202 are reset.
When the working platform 6 needs to be manually tilted backwards to realize manual leveling, valve heads of the electromagnetic valve I201, the electromagnetic valve II 202, the electromagnetic valve III 304 and the electromagnetic valve IV 305 are still in a power-off state, the valve positions of the electromagnetic valve I201 and the electromagnetic valve II 202 are adjusted through manual reversing operation, and pressure oil from the hydraulic pump 9 enters a rodless cavity of the digital leveling cylinder 301 through the electromagnetic valve II 202, the throttle valve II 204 and the electromagnetic valve IV 305; the solenoid valve i201 is turned on, the pressure port P0 keeps oil pressure, and the pressure at the control port K of the pilot operated check valve 306 is provided to reversely open the pilot operated check valve 306, so that the cylinder rod slowly extends outwards. The oil path is as follows: oil supply manifold → P2 → B2 → B4 → C4 → rodless chamber; the oil liquid in the rod cavity of the digital leveling cylinder 301 returns to the oil tank through a hydraulic control one-way valve 306, an electromagnetic valve III 304, a throttle valve I203 and an electromagnetic valve II 202, and the oil path is as follows: rod cavity → C → V → C3 → B3 → A2 → T2 → oil return manifold, which enables manual recline leveling of the work platform. After the manual leveling is finished, the solenoid valve I201 and the solenoid valve II 202 are reset.
Claims (10)
1. The utility model provides a high altitude construction car work platform's digital hydraulic pressure leveling system which characterized in that: comprises that
An oil supply unit; the oil supply unit comprises an oil supply main pipe and an oil return main pipe;
the leveling sensor (8) is used for detecting the inclination of the working platform (6);
a stepping motor (303); a rotating shaft of the stepping motor (303) rotates according to the inclination angle value detected by the leveling sensor (8);
a digital leveling cylinder (301); a cylinder rod of the digital leveling cylinder (301) is connected with the working platform (6); an oil cavity at one side of the digital leveling cylinder (301) where a cylinder rod is located is a rod cavity, and an oil cavity at the other side is a rodless cavity; when the cylinder rod stretches along the digital leveling cylinder (301), the inclination angle of the working platform (6) is driven to change;
a digital valve (302); the digital valve (302) comprises a pressure oil port P0, an oil return port T0, a working oil port A0 and a working oil port B0; the pressure oil port P0 is communicated with an oil supply main pipe, the oil return port T0 is communicated with an oil return main pipe, the working oil port A0 is communicated with a rod cavity, and the working oil port B0 is connected with a rodless cavity; and a rotating shaft of the stepping motor (303) is connected with a valve core of the digital valve (302), and the rotating shaft of the stepping motor (303) drives the digital valve (302) to change direction when rotating.
2. The digital hydraulic leveling system for aerial lift truck work platforms of claim 1 wherein: the device also comprises an electromagnetic valve II (202); the electromagnetic valve II (202) comprises a pressure oil port P2, an oil return port T2, a working oil port A2 and a working oil port B2; the pressure oil port P2 is communicated with an oil supply main pipe, the oil return port T2 is communicated with an oil return main pipe, the working oil port A2 is communicated with a rod cavity, and the working oil port B2 is communicated with a rodless cavity;
when the pressure oil port P2 is communicated with the working oil port A2, the oil return port T2 is communicated with the working oil port B2; when the pressure port P2 is communicated with the working port B2, the return port T2 is communicated with the working port a 2.
3. The digital hydraulic leveling system for aerial lift truck work platforms of claim 2 wherein: and the second solenoid valve II (202) is provided with a second manual emergency positioning knob for manual reversing of the second solenoid valve II (202).
4. The digital hydraulic leveling system for aerial lift truck work platforms of claim 3 wherein: an electromagnetic valve I (201) for stopping the circulation of hydraulic oil is arranged on a hydraulic pipeline connecting the pressure oil port P0 and the oil return port T0.
5. The digital hydraulic leveling system for aerial lift truck work platforms of claim 4 wherein: a hydraulic control one-way valve (306) is arranged on a pipeline at the hydraulic oil interface of the rod cavity and/or the rodless cavity; the hydraulic control one-way valve (306) comprises an oil inlet V, an oil outlet C and a control oil port K; the oil inlet V is communicated with one side of the digital valve (302), the oil outlet C is communicated with one side of the digital leveling cylinder (301), and the control oil port K is communicated with a hydraulic pipeline at a pressure oil port P0;
the solenoid valve I (201) comprises a pressure oil port P1, an oil return port T1, a working oil port A1 and a working oil port B1; the pressure oil port P1 can be communicated with a working oil port A1, and the oil return port T1 can be communicated with a working oil port B1; solenoid valve I (201) are provided with first manual emergent location knob for solenoid valve I (201) manual switching-over.
6. The digital hydraulic leveling system for aerial lift truck work platforms of claim 5 wherein: the electromagnetic valve further comprises an electromagnetic valve III (304) and an electromagnetic valve IV (305);
the solenoid valve III (304) comprises a working oil port A3, a working oil port B3 and a working oil port C3; the working oil port A3 and the working oil port B3 can be respectively communicated with the working oil port C3; the working oil port A3 is communicated with a working oil port A0, the working oil port B3 is communicated with a working oil port A2, and the working oil port C3 is communicated with a rod cavity;
the solenoid valve IV (305) comprises a working oil port A4, a working oil port B4 and a working oil port C4; the working oil port A4 and the working oil port B4 can be respectively communicated with the working oil port C4; the working oil port A4 is communicated with a working oil port B0, the working oil port B4 is communicated with a working oil port B2, and the working oil port C4 is communicated with a rodless cavity.
7. The digital hydraulic leveling system for aerial lift truck work platforms of claim 6 wherein: a throttle valve I (203) is arranged between the working oil port B3 and the working oil port A2; and a throttle valve II (204) is arranged between the working oil port B4 and the working oil port B2.
8. The digital hydraulic leveling system for aerial lift truck work platforms of claim 6 wherein: the electromagnetic valve I (201) is a two-position four-way middle H-shaped spring reset single electromagnetic valve; the solenoid valve II (202) is a spring reset double solenoid valve of a three-position four-way middle position O type; solenoid valve III (304) and solenoid valve IV (305) are two-position three-way spring reset single solenoid valves.
9. The digital hydraulic leveling system for aerial lift truck work platforms of claim 1 wherein: an overflow valve (11) used for relieving the pressure of the oil supply main pipe is arranged between the oil supply main pipe and the oil return main pipe.
10. The digital hydraulic leveling system for aerial lift truck work platforms of any one of claims 1 to 9 wherein: the device also comprises a rotary table structure (1), a main arm (2), a main arm variable amplitude oil cylinder (3), a crank arm (4) and a crank arm variable amplitude oil cylinder (5); the rotary table structure (1) is hinged with the main arm (2) through a pin shaft; one end of the main arm variable amplitude oil cylinder (3) is hinged with the rotary table structure (1) through a pin shaft, and the other end of the main arm variable amplitude oil cylinder (3) is hinged with the main arm (2) through a pin shaft;
one end of the crank arm (4) is connected with the tail end of the main arm (2) through a first connecting rod mechanism, and the other end of the crank arm (4) is connected with the working platform (6) through a second connecting rod mechanism; one end of a crank arm variable amplitude oil cylinder (5) is hinged to the inner side of the main arm (2) through a pin shaft, and the other end of the crank arm variable amplitude oil cylinder (5) is hinged to a first connecting rod mechanism between the crank arm (4) and the main arm (2) through a pin shaft;
the cylinder bottom at one side of the rodless cavity of the digital leveling cylinder (301) is hinged with the crank arm (4) through a pin shaft, and the cylinder rod of the digital leveling cylinder (301) is hinged with a second connecting rod mechanism between the working platform (6) and the crank arm (4) through a pin shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922086621.7U CN211231059U (en) | 2019-11-28 | 2019-11-28 | Digital hydraulic leveling system of working platform of overhead working truck |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922086621.7U CN211231059U (en) | 2019-11-28 | 2019-11-28 | Digital hydraulic leveling system of working platform of overhead working truck |
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| CN211231059U true CN211231059U (en) | 2020-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922086621.7U Withdrawn - After Issue CN211231059U (en) | 2019-11-28 | 2019-11-28 | Digital hydraulic leveling system of working platform of overhead working truck |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110864019A (en) * | 2019-11-28 | 2020-03-06 | 徐州海伦哲特种车辆有限公司 | Digital hydraulic leveling system of working platform of overhead working truck |
| CN113324059A (en) * | 2021-07-01 | 2021-08-31 | 西南交通大学 | Electric hydrostatic high-pressure valve |
| CN114278645A (en) * | 2021-12-17 | 2022-04-05 | 合肥长源液压股份有限公司 | Digital hydraulic cylinder |
-
2019
- 2019-11-28 CN CN201922086621.7U patent/CN211231059U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110864019A (en) * | 2019-11-28 | 2020-03-06 | 徐州海伦哲特种车辆有限公司 | Digital hydraulic leveling system of working platform of overhead working truck |
| CN110864019B (en) * | 2019-11-28 | 2024-08-23 | 徐州海伦哲特种车辆有限公司 | Digital hydraulic leveling system of working platform of overhead working truck |
| CN113324059A (en) * | 2021-07-01 | 2021-08-31 | 西南交通大学 | Electric hydrostatic high-pressure valve |
| CN114278645A (en) * | 2021-12-17 | 2022-04-05 | 合肥长源液压股份有限公司 | Digital hydraulic cylinder |
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