JPH034865Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a liquid control valve suitable for placement in a hydraulic circuit provided in a lifting device such as a hydraulic elevator or cargo lift.

[Conventional technology]

Conventionally, in elevating devices such as hydraulic elevators and cargo lifts that raise and lower heavy objects, as shown in FIG. By operating the liquid switching valve 35 disposed in the circuit 34, pressure liquid is controlled to flow into each single acting cylinder 32, 33 to raise the table 31, and is branched from the single acting cylinder side circuit of the liquid switching valve 35 to control the flow of pressure liquid into each single acting cylinder 32, 33. Liquid control valve 3 arranged in a branch circuit 36 connected to the side
7, the pressure liquid in each single-acting cylinder 32, 33 is controlled to flow out to the low pressure side, and the table 31 is lowered.

[Problem that the invention attempts to solve]

However, in order to prevent the table 31 from descending due to the heavy load loaded on it or its own weight when the table 31 is stopped, the structure of the liquid control valve 37 is as shown in FIG. A poppet-shaped valve body 41 is removably attached to a valve seat 40 formed in a communication hole that communicates between the outflow passages 39 connected to the side to prevent liquid leakage in the closed state. The pressure liquid in each single-acting cylinder 32, 33 is controlled to flow out by pressing the body 41 away from the valve seat 40 against the force of the spring 43, and when the electromagnetic device 42 is de-energized, the valve body 41
Since the valve seat 40 is seated by three forces and the outflow of pressure liquid is blocked, the change of the valve seat 40 from the open state to the closed state is short, and the single-acting cylinder 3
When stopping 2, 33 on the way down, surge pressure occurs in the hydraulic circuit, causing vibration and noise in the lifting device.
In the worst case scenario, there was a problem in that the load on the table could fall and be damaged.

The present invention solves these problems and provides a liquid control valve in which the speed of movement of the valve body from the open position to the closed direction can be freely controlled, and optimal liquid control can be obtained depending on the application. It is something.

[Means for solving problems]

The structure of the present invention, which was created to solve this problem, is that the liquid inflow passage and outflow passage are connected to the main body through a communication hole formed with the valve seat, and the liquid can be removed from the valve seat or seated on the valve seat. A valve body is arranged to open and close the communication hole by fitting into the guide hole of the main body so as to be movable in the axial direction, so that the pressure on the inflow passage side is applied to the valve body in the opening direction, and the pressure on the inflow passage side and the throttle passage are A working chamber is provided at the back of the valve body that communicates with the valve body through the valve body so that pressure and a spring force are applied to the valve body in the closing direction. A braking member is disposed in the body by fitting the distal end into the end facing the action chamber of the body, and the liquid in the action chamber formed by the fitting and insertion of the brake member into the valve body is throttled and controlled to flow out of the valve body. It is characterized in that it is provided to brake the speed of movement of the body from the open position to the closed direction.

[Effect]

In this configuration of the present invention, by communicating the working chamber to the low pressure side by moving the pilot valve body, the valve body moves in the opening direction of the communication hole by the acting force due to the pressure on the inflow passage side, and the pilot valve By cutting off the communication between the working chamber and the low pressure side by moving the body, the valve body moves from the open position of the communication hole to the closing direction by the action force of the working chamber pressure and the spring force, and the movement When the brake member is inserted into the end of the valve body, the liquid in the action chamber formed by the valve body is throttled and controlled to flow out, so the movement speed of the valve body in the closing direction is gently braked. Optimal liquid control can be obtained depending on the application.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, reference numeral 1 denotes a liquid control valve body (hereinafter referred to as the main body), which is composed of a main body 2 and a sub-body 3 that are integrally connected. The main body 2 has a fluid inflow passage 4 and an outflow passage 5, and the inflow and outflow passages are communicated with each other through a communication hole 6 inside. 7 is a valve seat formed at the opening of the communication hole 6 on the inflow passage 4 side; 8 is a valve body for opening and closing the communication hole 6; one end has a poppet shape so as to be in line contact with the valve seat 7; It is fitted into a guide hole 9 provided coaxially with the hole 6 and communicating with the inflow passage 4 side so as to be movable in the axial direction. 10
12 is a bushing member press-fitted into the sub-body 3, one end of which is inserted into the guide hole 9 of the main body 2, and the main-sub body 2 is inserted into the guide hole 9. It is positioned between the main bodies 2 and 3, and has a large-diameter hole 13 and a small-diameter hole 14 formed in series and penetrated inside, and a pilot having a diameter smaller than the diameter of the valve seat 7 at the stepped portion of the different diameter. A valve seat 15 is formed. 16 is a pilot valve body, and the bushing member 12
It is movably inserted into the large diameter hole 13 of the valve, and one end is provided with a sphere 17 that can be attached to and separated from the pilot valve seat 15 to block communication of the working chamber 11 from the small diameter hole 14 to the outflow passage 5 side via the return path 18. I try to do that. 19
A spring is connected between the valve body 8 and the pilot valve body 16, and is provided to apply a force to each valve body in the closing direction, that is, in the direction of seating the valve seat. Reference numeral 20 denotes a push rod for abutting the sphere 17 and moving the pilot valve body 16. The push rod 20 is inserted into the small diameter hole 14 of the bushing member 12 and has one end extending outside the sub-body 3. Reference numeral 21 denotes an electromagnetic device placed on the side surface of the sub-body 3, in which the movable core 24 is attracted to the fixed core 23 by energizing the coil 22.
The push rod 20 is moved by pressing the push rod 20. Reference numeral 25 denotes a braking member that brakes the speed of movement of the valve body 8 from the open position to the closed direction,
The distal end portion is inserted into one end portion facing the main body 2 and is screwed into the main body 2. Reference numeral 26 denotes a constriction passage, which is an action chamber 2 formed by fitting the braking member 25 into the main body 8.
7 is provided so as to communicate with the outflow passage 5. 28
is a spring that is housed in the action chamber 27 and presses the valve body 8 in the opening direction.

Next, the operation of this configuration will be explained.

It is assumed that the inflow passage 4 is connected to the single-acting cylinder side of the lifting device, and the outflow passage 5 is connected to the low pressure side, respectively, and the drawing shows a state in which the coil 22 of the electromagnetic device 21 is not energized.

When the coil 22 is energized from this, the movable iron core 2
4 is attracted to the fixed iron core 23 and presses and moves the pilot valve body 16 via the push rod 20 so as to separate it from the pilot valve seat 15, and the pressure liquid in the action chamber 11 is pumped through the notch provided on the outer periphery of the pilot valve body 16. flows out from the pilot valve seat 15 through the small-diameter hole 14 and the return passage 18 to the outflow passage 5 side, and the valve body 8 has the pressure in the action chamber 11 almost equal to the pressure on the outflow passage 5 side due to the action of the throttle passage 10. As a result, the pressure liquid on the inflow passage 4 side is moved away from the valve seat 7 against the force of the spring 19 by the acting force of the pressure on the inflow passage 4 side, and the pressure liquid on the inflow passage 4 side flows out into the outflow passage 5 and is The moving cylinder moves downward. When the coil 22 is de-energized to stop the downward movement of the single-acting cylinder, the adsorption of the movable core 24 is released and the pilot valve body 16 seats the sphere 17 on the pilot valve seat 15 by the force of the spring 19. The communication between the action chamber 11 and the outflow passage 5 is cut off. Since the pressure liquid on the inflow passage 4 side flows into the action chamber 11 through the throttle passage 10, the valve body 8 is moved to be seated on the valve seat 8 by the action force of the action chamber 11 pressure and the force of the spring 19. Then, the outflow of the pressure liquid on the inflow passage 4 side is blocked and the single-acting cylinder stops.

With this operation, when the valve body 8 moves from the open position to the closing direction, the valve body 8 directs the liquid in the action chamber 27 formed with the brake member 25 to the outflow passage 26 through the throttle passage 26.
Since it flows out to the side and resists the force of the spring 28, its movement speed is reduced by the action chamber 27 caused by the aperture passage 26.
It is braked by the acting force of the pressure and the mounting force of the spring 28 and is gently seated on the valve seat 8, so that the single-acting cylinder connected to the inflow passage 4 side can be stopped without a shock during the downward operation. By changing the diameter of the throttle passage 26 and changing the amount of liquid flowing out from the action chamber 27, it is possible to easily obtain the optimum liquid control according to the application, and by this action, the liquid circuit of the lifting device can be easily controlled. It is easy to raise and lower heavy objects smoothly and safely.

Note that the spring 28 housed in the action chamber 27 may be omitted if necessary.

[Effect of idea]

As described above, according to the present invention, the inflow passage and the outflow passage of the liquid are provided in the main body so as to communicate with each other through the communication hole in which the valve seat is formed, and the main body is guided so as to leave the valve seat and sit on the valve seat. A valve body is arranged to open and close the communication hole by being fitted into the hole so as to be movable in the axial direction, and the valve body causes pressure on the inflow passage side to act on the valve body in the opening direction, and communicates with the inflow passage side via the throttle passage. A working chamber formed at the back is provided so that pressure and spring force act on the valve body in the closing direction, and the working chamber is provided so that it can be freely communicated with and shut off to the low pressure side by moving the pilot valve body, and is opposed to the working chamber of the valve body. A braking member is placed in the main body by fitting the tip into the end, and the liquid in the action chamber formed by fitting the braking member into the valve body is throttled and controlled to flow out from the open position of the valve body in the closing direction. Since it is provided to brake the speed of movement of the valve body from the open position to the closed direction, it is possible to gently brake the speed of movement of the valve body from the open position to the closed direction, and it is possible to easily obtain optimal liquid control according to the application. By placing it in the liquid circuit of the lifting device, heavy objects can be raised and lowered smoothly and safely, and the range of use can be expanded.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view of a liquid control valve showing an embodiment of the present invention, Fig. 2 is a liquid circuit diagram of a lifting device to which the liquid control valve of the present invention is applied, and Fig. 3 is a conventional example of a liquid control valve. It is a diagram. DESCRIPTION OF SYMBOLS 1... Main body, 4... Inflow passage, 5... Outflow passage, 7... Valve seat, 8... Valve element, 9, 27... Action chamber, 16... Pilot valve element, 25... Regulating member.

Claims (1)

[Scope of utility model registration request] The liquid inflow passage and outflow passage are provided in the main body so as to communicate with each other through a communication hole formed with the valve seat, and the valve seat is fitted into the guide hole of the main body so as to be able to move freely in the axial direction so as to be able to move away from the valve seat or sit on the valve seat. A valve element is inserted to open and close the communication hole, and pressure on the inflow passage side is applied to the valve element in the opening direction, and an action chamber pressure and a spring are formed on the back of the valve element, which communicates with the inflow passage side via a restriction passage. A force is applied to the valve body in the closing direction, an action chamber is provided so that communication can be cut off to the low pressure side by moving the pilot valve body, and the tip is inserted into the end of the valve body opposite to the action chamber. A brake member is disposed in the main body, and the liquid in the action chamber formed by fitting the brake member into the valve body is throttled and controlled to flow out and brake the speed of movement of the valve body from the open position to the closed direction. Liquid control valve consisting of