CN219774877U - Two-point hydraulic control valve with pressure cut-off for motor - Google Patents

Abstract

The utility model discloses a two-point hydraulic control valve with pressure cutoff for a motor, which comprises a valve body, wherein the valve body is provided with an HZ3 control valve, the valve body is provided with a D control valve, the HZ3 control valve comprises an HZ3 main valve hole, one side of the HZ3 main valve hole is in threaded connection with a screw plug, and the HZ3 main valve hole is provided with an HZ3 valve core, and the utility model has the beneficial effects that: when a certain pressure is introduced from the X port, the pressure pushes the HZ3 valve core to move rightwards after overcoming the first spring force, so that the HZ3 control valve is reversed, the communication relation of four oil ports is changed into p-a and p-b communication, the large-area cavity and the small-area cavity of the variable piston are both high pressure, and the variable piston is changed into a small-displacement state from a large-displacement state under the action of pressure difference caused by area difference; the variable piston small-area cavity is still communicated with high-pressure oil, and the variable piston moves downwards under the pushing of the high-pressure oil in the small-area cavity, so that the motor is switched from a high-speed running state with minimum displacement to a low-speed high-torque state with maximum displacement.

Description

Two-point hydraulic control valve with pressure cut-off for motor

Technical Field

The utility model relates to the technical field of machinery, in particular to a two-point hydraulic control valve for cutting off a motor with pressure.

Background

The hydraulic motor is used as an executive component of a hydraulic system and is usually used for driving a load to do rotary motion, such as the rotation of a crane winch, the walking of a crawler belt and the like, and the control mode of the hydraulic motor is many, wherein the hydraulic motor has two-point hydraulic control of HZ 3.

Most of the prior HZ3 type control valves do not have a pressure cut-off function, and if the motor runs in a rapid small torque state (small displacement), the motor is easy to damage when encountering a large load, and besides, the prior HZ3 type control valves need to replace a piston rod with the same area ratio, so that the manufacturing cost of the motor is greatly increased.

Therefore, the two-point hydraulic control valve for cutting off the motor with pressure is designed and produced so as to solve the problem that the motor is easy to damage when a large load is encountered.

Disclosure of Invention

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a motor is with two point hydraulically controlled control valves that take pressure to cut off, includes the valve body, the valve body is provided with the HZ3 control valve, the valve body is provided with the D control valve, the HZ3 control valve includes the HZ3 main valve opening, one side threaded connection of HZ3 main valve opening has the plug screw, the HZ3 main valve opening is provided with the HZ3 case, the plug screw laminating has first spring holder, fixedly connected with first spring between first spring holder and the HZ3 case, the D control valve includes the D valve opening, the internally mounted of D valve opening has the valve pocket, the valve pocket is provided with the D case, the second spring holder is installed to one side of D case, second spring holder fixedly connected with second spring, D valve opening threaded connection has adjusting nut, adjusting nut threaded connection has adjusting screw, D threaded connection has sealed lock nut.

Preferably, an oil return cavity is arranged at one side of the HZ3 main valve hole close to the screw plug, and an X external control port is arranged at one side of the HZ3 main valve hole far away from the screw plug.

Preferably, the diameter of the HZ3 main valve hole is smaller than that of the oil return cavity.

Preferably, the HZ3 valve core is stepped.

Preferably, the right side of the HZ3 valve core is provided with a section of large-diameter shoulder.

Compared with the prior art, the utility model has the beneficial effects that: when a certain pressure is introduced from the X port, the pressure pushes the HZ3 valve core to move rightward after overcoming the first spring force, so that the HZ3 control valve is reversed, the communication relation of four oil ports is changed into p-a communication and p-b communication, the large-area cavity and the small-area cavity of the variable piston are both high pressure, and the variable piston is changed into a small-displacement state from a large-displacement state under the action of pressure difference caused by area difference, namely, the equipment is switched from low-speed operation to high-speed operation; the variable piston small-area cavity is still communicated with high-pressure oil, and the variable piston moves downwards under the pushing of the high-pressure oil in the small-area cavity, so that the motor is switched from a high-speed running state with minimum displacement to a low-speed high-torque state with maximum displacement.

Drawings

FIG. 1 is a schematic view of a partial cross-sectional structure of an HZ3 control valve of the present utility model;

FIG. 2 is a schematic view of a partial cross-sectional structure of a D control valve of the present utility model;

FIG. 3 is a schematic diagram of a partial mating structure of a motor and a control valve according to the present utility model;

fig. 4 is a schematic view of the hydraulic remote structure of the present utility model.

In the figure: 1. a valve body; 2. an HZ3 valve core; 3. a first spring; 4. a first spring seat; 5. a screw plug; 6. an adjusting screw; 7. sealing the lock nut; 8. an adjusting nut; 9. a second spring seat; 10. a second spring; 11. a valve core D; 12. a valve sleeve; 20. an HZ3 control valve; 21. HZ3 main valve hole; 30. a control valve; 31. and D, valve hole.

Detailed Description

The utility model is further described below with reference to the accompanying drawings.

Examples

Referring to fig. 1-4, the present embodiment provides a two-point hydraulic control valve for motor with pressure cut-off, which is composed of a valve body 1, an HZ3 valve core 2, a first spring 3, a first spring seat 4, a screw plug 5, and an HZ3 main valve hole 21 together to form a two-position four-way reversing valve (HZ 3 control valve 20), so as to realize the two-point control function of the motor, wherein the HZ3 main valve hole 21 of the valve body 1 is a through hole, the left side of the HZ3 main valve hole 21 is an X external control port, the right side is an oil return cavity, and the diameter of the oil return cavity is larger than that of the HZ3 main valve hole 21; the HZ3 valve core 2 is in a ladder shape, and a section of large-diameter shoulder is processed on the right side of the HZ3 valve core 2; the HZ3 valve core 2 is arranged from the right side of the HZ3 main valve hole 21, and the HZ3 valve core 2 is in clearance fit with the HZ3 main valve hole 21; the orifice of the oil return cavity is blocked by a screw plug 5; a first spring 3 and a first spring seat 4 are arranged between the right side of the HZ3 valve core 2 and the screw plug 5, the first spring seat 4 is attached to the first screw plug 5, and the left end face of the large shoulder is attached to the right end face of the main valve hole under the precompression force of the first spring 3 of the HZ3 valve core 2.

The valve body 1, the adjusting screw 6, the sealing lock nut 7, the adjusting nut 8, the second spring 10, the second spring seat 9, the D valve core 11, the valve sleeve 12 and the D valve hole 31 form a two-position three-way reversing valve (D control valve 30), the D valve hole 31 of the valve body 1 for realizing the pressure cutting-off function of the motor is a blind hole, the bottom of the hole is communicated with a T hole through a process hole, and the T hole is communicated with the oil tank after being communicated with the motor shell; the valve sleeve 12 is arranged in the D valve hole 31, and the two are in transition fit; the right end face of the valve sleeve 12 is attached to the bottom end of the D valve hole 31; the outer circle matched with the D valve hole 31 is formed by two sections of diameters, the diameter of the outer circle at the rightmost side is slightly smaller, the other diameters are slightly larger, and the two sections of different diameters form an annular area; the valve core 11 is arranged in a central hole of the valve sleeve 12, and the valve core 11 is provided with a second spring seat 9, a second spring 10, the second spring seat 9 and an adjusting nut 8 in turn leftwards; the adjusting nut 8 is in threaded connection with the valve body 1 and is fixed on the end face of the hole of the D valve 30; the adjusting screw 6 is screwed into the adjusting nut 8 rightwards, and is propped against the second spring seat 9, so that the second spring 10 is pressed and deformed to generate the compression force of the second spring 10, and finally the D valve core 11 is pressed on the bottom surface of the D valve hole 31, and the compression force value of the second spring 10 corresponds to the pressure cut-off value one by one.

In the initial state, the communication relation of four oil ports of the two-position four-way reversing valve formed by the HZ3 valve core 2 and the D valve hole 31 is p-b communication, a-t communication; the communication relation of three oil ports of the two-position three-way valve formed by the valve core 11 and the valve sleeve 12 is D-f communication, and f-c is not communicated; at this time, the port a of the HZ3 control valve 20 is communicated with the large area cavity of the variable piston through the port D, the port f and the port M2 of the D control valve in sequence, and the port b is communicated with the small area cavity of the variable piston through the port M1. At this time, the large-area cavity of the variable piston is low pressure, the small-area cavity is high pressure, so that the motor is in a maximum displacement state, after a certain pressure is introduced from the X port, the pressure pushes the HZ3 valve core 2 to overcome the force of the first spring 3 and then move rightwards, the HZ3 control valve 20 is reversed, the four-port communication relationship is changed into p-a and p-b communication, the large-area cavity and the small-area cavity of the variable piston are both high pressure, and the variable piston is changed into a small-displacement state from a large-displacement state under the action of pressure difference caused by area difference, namely, the device is switched from low-speed operation to high-speed operation.

When the motor runs in a high-speed state, if the load suddenly increases, the system pressure rises, when the pressure reaches a pressure cut-off set value, the D valve core 11 is pushed, the two-position three-way valve is reversed, an oil way from an a port of the HZ3 control valve 20 to the large-area side of the piston rod is cut off, the large-area side oil of the piston rod is communicated with the T port directly through an M1 port, an f port and a c port in sequence, and finally is communicated with an oil tank, a small-area cavity of a variable piston is still communicated with high-pressure oil, and the variable piston moves downwards under the pushing of the high-pressure oil of the small-area cavity, so that the motor is switched from a high-speed running state with minimum displacement to a low-speed large-torque state with maximum displacement.

The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which are intended to be comprehended within the scope of the present utility model.

Other parts of the present utility model not described in detail are all of the prior art, and are not described in detail herein.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (5)

1. The utility model provides a motor is with two point hydraulically controlled control valves that take pressure to cut off, includes valve body (1), valve body (1) are provided with HZ3 control valve (20), valve body (1) are provided with D control valve (30), its characterized in that: the utility model provides a high-pressure fluid control valve, including HZ3 control valve (20), HZ3 control valve (20) include HZ3 main valve hole (21), one side threaded connection of HZ3 main valve hole (21) has plug screw (5), HZ3 main valve hole (21) are provided with HZ3 case (2), plug screw (5) laminating has first spring holder (4), fixedly connected with first spring (3) between first spring holder (4) and HZ3 case (2), D control valve (30) include D valve hole (31), the internally mounted of D valve hole (31) has valve pocket (12), valve pocket (12) are provided with D case (11), second spring holder (9) are installed to one side of D case (11), second spring holder (9) fixedly connected with second spring (10), D valve hole (31) threaded connection has adjusting nut (8), adjusting nut (8) threaded connection has adjusting screw (6), and D valve hole (31) threaded connection has sealed lock nut (7).

2. The two-point pilot operated control valve with pressure cutoff for a motor of claim 1, wherein: the side of the HZ3 main valve hole (21) close to the screw plug (5) is an oil return cavity, and the side of the HZ3 main valve hole (21) far away from the screw plug (5) is an X external control port.

3. The two-point pilot operated control valve with pressure cutoff for a motor of claim 1, wherein: the diameter of the HZ3 main valve hole (21) is smaller than that of the oil return cavity.

4. The two-point pilot operated control valve with pressure cutoff for a motor of claim 1, wherein: the HZ3 valve core (2) is in a ladder shape.

5. The two-point pilot operated control valve with pressure cutoff for a motor of claim 4, wherein: a section of shoulder is arranged on the right side of the HZ3 valve core (2).