A three-position four-way directional control valve

Abstract

The utility model discloses a three -way reversing valve, including valve body, valve core, manual reversing handle and return spring, the valve core sliding installation is in the valve body, and manual reversing handle is hinged in the end of valve core, install hydraulic reversing cylinder and oil tank on the valve body, the liquid outlet of oil tank and the liquid inlet of hydraulic reversing cylinder are communicated through liquid inlet pipe and micro - pump no.

Description

Technical Field

[0001] This utility model relates to the field of control valve technology, and in particular to a three-position four-way directional valve. Background Technology

[0002] The three-position four-way directional valve is a common control valve. This valve has three working positions and four oil ports (usually two inlets and two outlets), which are represented by P, 0, A, and B respectively. Among them, P is the oil inlet, 0 is the oil return port, and A and B are connected to the upper and lower chambers of the actuator respectively. The three-position four-way directional valve consists of a two-position four-way directional valve and a stationary position valve. It can be either a spool valve structure or an on / off valve structure.

[0003] Existing common three-position four-way directional valves are either manually controlled or electrically or hydraulically controlled, all of which are single-control valves and cannot achieve dual control. When the single control fails, the entire valve cannot work properly, affecting the safe operation of the equipment.

[0004] Therefore, we propose a three-position four-way directional valve to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a three-position four-way reversing valve to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A three-position four-way directional valve includes a valve body, a valve core, a manual directional handle, and a return spring. The valve core is slidably mounted in the valve body, and the manual directional handle is hinged to the end of the valve core for controlling the sliding displacement of the valve core. A hydraulic directional cylinder and an oil tank are mounted on the valve body. The outlet of the oil tank is connected to the inlet of the hydraulic directional cylinder through an inlet pipe and a micro pump one. The outlet of the oil tank is connected to the return port of the hydraulic directional cylinder through a return pipe and a micro pump two.

[0008] A piston block is movably installed inside the hydraulic reversing cylinder. A spring is connected between the piston block and the inner bottom of the hydraulic reversing cylinder. A connecting rod passes through the spring, with one end of the connecting rod connected to the piston block and the other end passing through the hydraulic reversing cylinder and the valve body and connected to a pressing block. A pressure block is also installed on the shaft of the valve core. When the pressing block moves downward, it presses the pressure block to control the sliding displacement of the valve core.

[0009] In a further embodiment, the lower end of the extrusion block and the upper end of the pressure block adopt a mutually cooperating inclined structure.

[0010] In a further embodiment, a plurality of rollers are uniformly rotatably mounted on the lower inclined surface of the extrusion block, the axis of which is perpendicular to the extension direction of the lower inclined surface of the extrusion block.

[0011] In a further embodiment, the oil tank is also provided with an inlet, and a cap is screwed onto the external thread of the inlet.

[0012] In a further embodiment, the pressure block is locked to the valve core shaft by a pair of bushings, which are locked together by several sets of bolts.

[0013] In a further embodiment, a controller is also mounted on the valve body, which is electrically connected to micropump one and micropump two.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention, by setting a manual reversing handle and a hydraulic reversing cylinder, allows the entire valve to not only be controlled by the manual reversing handle to slide and move the valve core, but also by changing the pressure inside the hydraulic reversing cylinder to drive the piston block to drive the extrusion block to extrude the pressure block, thereby controlling the sliding and moving of the valve core. This achieves a dual control effect, so that if one control fails, the other control can still maintain the normal operation of the valve, which is beneficial to improving the safety of equipment operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the left front view structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the left rear view structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the valve body of this utility model after partial cross-section.

[0019] Figure 4 This is a schematic diagram of the structure of the extrusion block and the pressure block of this utility model when they are in contact.

[0020] In the diagram: 1. Valve body; 2. Valve core; 3. Manual reversing handle; 4. Hydraulic reversing cylinder; 41. Piston block; 42. Spring; 43. Connecting rod; 44. Pressing block; 441. Roller; 5. Oil tank; 51. Cap; 6. Inlet pipe; 7. Micro pump one; 8. Return pipe; 9. Micro pump two; 10. Controller; 11. Pressure block; 111. Bushing; 112. Bolt; 12. Return spring. Detailed Implementation

[0021] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-4A three-position four-way directional control valve includes a valve body 1, a valve core 2, a manual directional control handle 3, and a return spring 12. The valve core 2 is laterally slidably installed inside the valve body 1. One end of the manual directional control handle 3 is hinged to the front end of the shaft of the valve core 2, and the other end extends out of the valve body 1 to control the sliding displacement of the valve core 2. The rear end of the shaft of the valve core 2 is connected to the valve body 1 by the return spring 12. In the initial natural state, the valve core 2 is in the left position. The manual directional control handle 3 can control the valve core 2 to move to the right two positions in sequence, so that the valve core 2 is in the middle or right position. When the valve core 2 moves to the right, it will compress the return spring 12 and shorten it. When the manual directional control handle 3 moves to the left, the valve core 2 can return to the left under the elastic force of the return spring 12. A hydraulic directional cylinder 4 and an oil tank 5 are installed on the valve body 1. The outlet of the oil tank 5 and the inlet of the hydraulic directional cylinder 4 are connected by an inlet pipe 6 and a micro pump 7. The inlet pipe 6 extends into the oil tank. The hydraulic cylinder 4 is connected to the hydraulic tank 5 via a return pipe 8 and a micro pump 9, allowing the micro pump 7 to draw oil from the tank and deliver it to the hydraulic reversing cylinder 4. The pressure of the hydraulic cylinder 4 is adjusted by changing the amount of oil in it. A piston block 41 is movably installed inside the hydraulic reversing cylinder 4. The hydraulic reversing cylinder 4 can slide vertically inside. A spring 42 is connected between the piston block 41 and the bottom of the hydraulic reversing cylinder 4. A connecting rod 43 passes through the spring 42. One end of the connecting rod 43 is connected to the piston block 41, and the other end passes through the hydraulic reversing cylinder 4 and the valve body 1 and is connected to a pressing block 44. The pressing block 44 extends into the valve body 1. A pressure block 11 is also installed on the shaft of the valve core 2. When the pressing block 44 moves downward, it presses the pressure block 11 to control the sliding displacement of the valve core 2.

[0025] To improve the pressing effect between the extrusion block 44 and the pressure block 11, the lower end of the extrusion block 44 and the upper end of the pressure block 11 adopt a mutually cooperating inclined structure. Furthermore, several rollers 441 are evenly rotatably mounted on the lower inclined surface of the extrusion block 44. The axis of the rollers 441 is perpendicular to the extension direction of the lower inclined surface of the extrusion block 44. When the rollers 441 contact the inclined surface of the pressure block 11, their rotation can reduce the sliding friction resistance of the extrusion contact, making the extrusion smoother and less strenuous.

[0026] To facilitate adjustment of the oil level in the oil tank 5, an inlet is provided on the oil tank 5. A cap 51 is screwed onto the external thread of the inlet, which allows for observation of the oil level when the cap 51 is opened, and also allows for replenishment of oil through the inlet.

[0027] To facilitate the assembly and disassembly of the pressure block 11, the pressure block 11 is locked to the shaft of the valve core 2 via a pair of bushings 111. One half of the bushings 111 is fixed to the pressure block 11 and fastened to the shaft of the valve core 2, while the other half of the bushings 111 is fastened to the bottom of the shaft of the valve core 2. The pair of bushings 111 are locked together by several sets of bolts 112, thereby fastening the shaft of the valve core 2.

[0028] A controller 10 is also installed on the valve body 1. The controller 10 is electrically connected to the micro pump 7 and the micro pump 9. The controller 10 can conveniently control the operation of the micro pump 7 and the micro pump 9. In actual operation, the controller 10 can accurately control the working status of the micro pump 7 and the micro pump 9. The micro pump 7 and the micro pump 9 can be fixed displacement pumps, thereby accurately controlling the amount of oil in the hydraulic reversing cylinder 4. Then, the position of the valve core 2 can be accurately controlled by the displacement of the piston block 41, the connecting rod 43 and the extrusion block 44.

[0029] Working process: During hydraulic reversing drive, after receiving an external signal, the controller 10 starts either micro pump 7 or micro pump 9. When micro pump 7 starts, it pumps oil from the oil tank 5 through the inlet pipe 6 into the inlet of the hydraulic reversing cylinder 4. The oil pressure pushes the piston block 41 to move downward against the resistance of the spring 42. The piston block 41 drives the pressing block 44 to move downward through the connecting rod 43. The inclined surface of the pressing block 44 contacts the inclined surface of the pressure block 11, converting the vertical force into a horizontal thrust, forcing the valve core 2 to slide to the right. When micro pump 9 starts, it pumps oil from the hydraulic reversing cylinder 4 through the return pipe 8 into the return port of the oil tank 5. The oil pressure pushes the piston block 41 upward, while the spring 42 assists in resetting. The connecting rod 43 drives the pressing block 44 to move upward, disengaging it from the pressure block 11. The reset spring... Spring 12 pushes valve core 2 to slide to the left, returning it to the neutral or initial position. The reset of valve core 2 depends on the elastic force of reset spring 12. After the squeezing block 44 disengages from the pressure block 11, it automatically returns to its original position. In order to accurately determine the position of valve core 2, three levels of oil volume can be set first. For example, when the oil volume is less than 5ml, squeezing block 44 does not contact pressure block 11, and valve core 2 is in the left position; when the oil volume is 10ml, squeezing block 44 partially contacts pressure block 11, and valve core 2 is pushed to the left to the neutral position; when the oil volume is 20ml, squeezing block 44 fully contacts pressure block 11, and valve core 2 is pushed to the left to the right position. Then, by controlling the oil volume in hydraulic reversing cylinder 4 through micro pump 1 7 or micro pump 2 9, the position of valve core 2 can be accurately controlled.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A three-position four-way directional valve, comprising a valve body (1), a valve core (2), a manual directional handle (3), and a return spring (12), characterized in that: The valve body (1) is equipped with a hydraulic reversing cylinder (4) and an oil tank (5). The outlet of the oil tank (5) is connected to the inlet of the hydraulic reversing cylinder (4) through an inlet pipe (6) and a micro pump (7). The outlet of the oil tank (5) is connected to the return port of the hydraulic reversing cylinder (4) through a return pipe (8) and a micro pump (9). A piston block (41) is movably installed inside the hydraulic reversing cylinder (4). A spring (42) is connected between the piston block (41) and the inner bottom of the hydraulic reversing cylinder (4). A connecting rod (43) passes through the spring (42). One end of the connecting rod (43) is connected to the piston block (41), and the other end passes through the hydraulic reversing cylinder (4) and the valve body (1) and is connected to a pressing block (44). A pressure block (11) is also installed on the shaft of the valve core (2). When the pressing block (44) moves downward, it presses the pressure block (11) to control the sliding displacement of the valve core (2).

2. A three-position four-way directional valve according to claim 1, characterized in that: The lower end of the extrusion block (44) and the upper end of the pressure block (11) adopt a mutually cooperating inclined structure.

3. A three-position four-way directional valve according to claim 1, characterized in that: Several rollers (441) are also uniformly rotatably mounted on the lower inclined surface of the extrusion block (44), and the axis of the rollers (441) is perpendicular to the extension direction of the lower inclined surface of the extrusion block (44).

4. A three-position four-way directional valve according to claim 1, characterized in that: The oil tank (5) is also provided with an inlet, and a cap (51) is screwed onto the external thread of the inlet.

5. A three-position four-way directional valve according to claim 1, characterized in that: The pressure block (11) is locked to the shaft of the valve core (2) by a pair of bushings (111), and the pair of bushings (111) is locked to the shaft by a number of bolts (112).

6. A three-position four-way directional valve according to claim 1, characterized in that: The valve body (1) is also equipped with a controller (10), which is electrically connected to micro pump one (7) and micro pump two (9).

Images