A proportional directional valve with chip installation

Abstract

The present invention discloses a plate-mounted proportional directional valve, comprising a valve body, a locking disk, a hook and a fixing pin; the hook is provided on one connecting surface of the valve body, and the fixing pin is provided on the other opposite connecting surface; the hook is rotatably connected to the valve body, the locking disk is rotatably arranged on the valve body, and an opening is provided on the locking disk; the locking disk can be rotated relative to the valve body until the opening is aligned with the hook and the fixing pin, so that the hook on the valve body can be rotated to form a connection or disconnection with the fixing pin on the adjacent valve body; the locking disk can be rotated until the opening is misaligned with the hook and the fixing pin to limit the rotation of the hook relative to the valve body. The plate-mounted proportional directional valve can realize convenient and quick assembly and disassembly operations.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic valves, and in particular to a proportional directional valve installed in a sheet-type manner. Background Art

[0002] The slide valve type proportional directional valve generally adopts a proportional solenoid to drive the valve core. It controls the flow of hydraulic oil based on the principle that the input voltage or current of the proportional solenoid is proportional to the displacement of the valve core. It is widely used in the hydraulic control systems of mechanical processing equipment such as injection molding machines, die-casting machines, extruders and stretching machines.

[0003] The chip-mounted proportional directional valve is a type of proportional directional valve. When in use, the chip-mounted proportional directional valve does not need to be installed on the integrated valve block. It is only necessary to place multiple chip-mounted proportional directional valves between the first valve plate and the tail valve plate, and then use multiple long screws to fix the first valve plate, the tail valve plate and multiple chip-mounted proportional directional valves together. This not only saves the cost of the integrated valve block, but also reduces the overall volume. Therefore, the chip-mounted proportional directional valve has been used more and more widely.

[0004] However, the existing chip-mounted proportional directional valve has the following problems:

[0005] 1. When multiple proportional directional valves installed in the existing chip type are required to be used in series, all the proportional directional valves installed in the chip type are generally strung on the screw, and then fixed with nuts at the end of the screw, which makes the installation and assembly of the valve group more complicated and requires a lot of manpower. In addition, this installation method is prone to leakage when used in working conditions with large pressure shocks;

[0006] 2. When the existing plate-mounted proportional directional valve group is in use, if one of the plate-mounted proportional directional valves is damaged and needs maintenance, the system needs to be shut down, and then the damaged valve needs to be dismantled and repaired before it can be assembled and used again. This maintenance process consumes a lot of time and manpower, affecting the normal use of the overall hydraulic system. Summary of the invention

[0007] In view of the above problems, the present invention proposes a plate-mounted proportional directional valve to overcome the above problems or at least partially solve the above problems.

[0008] A plate-mounted proportional directional valve comprises a valve body, a locking disk, a hook and a fixing pin; the hook is provided on one connecting surface of the valve body, and the fixing pin is provided on the other opposite connecting surface; the hook is rotatably connected to the valve body, and the locking disk is rotatably arranged on the valve body, and an opening is provided on the locking disk; the locking disk can be rotated relative to the valve body until the opening is aligned with the hook and the fixing pin, so that the hook on the valve body can be rotated to form a connection or decoupling with the fixing pin on the adjacent valve body; the locking disk can be rotated until the opening is misaligned with the hook and the fixing pin to limit the rotation of the hook relative to the valve body.

[0009] Optionally, the hook is rotatably arranged on the valve body through a torsion spring, and a hook slope is provided at one end of the hook that can be connected with the fixing pin; when two adjacent valve bodies are connected, the hook slope can abut against the fixing pin on the other valve body and drive the hook to overcome the torsion spring and rotate to open, and the hook can rotate under the action of the torsion spring to form a connection with the fixing pin.

[0010] Optionally, the plate-mounted proportional directional valve is also provided with a locking piston; a hook groove is provided on the hook, a rotating slider and a sliding spring are provided in the hook groove, the rotating slider is coaxially rotatably arranged with the torsion spring, the hook can reciprocate relative to the rotating slider along the direction in which two adjacent valve bodies are connected, and the sliding spring is connected to the rotating slider to drive the hook to move in the extending direction; a hook pin is provided at the other end of the hook, the locking piston is movably arranged on the valve body, and a piston ramp is provided at one end of the locking piston, the locking piston can move relative to the valve body until the piston ramp abuts against the hook pin, so as to drive the hook to overcome the sliding spring and move in the retracting direction.

[0011] Optionally, a control flow channel is provided on the valve body; the control flow channel extends to the other end of the locking piston to introduce control oil to drive the locking piston to move until the piston slope abuts against the hook pin.

[0012] Optionally, the control flow channel is communicated with port P.

[0013] Optionally, the valve body is provided with a plurality of the hooks and a plurality of the fixing pins, and the locking disk is provided with a plurality of the openings, and the plurality of the openings can rotate with the locking disk to be aligned with or staggered with the plurality of the hooks and the plurality of the fixing pins.

[0014] Optionally, the plurality of hooks and the plurality of fixing pins are arranged at end positions close to the valve body, and the locking plate is rotatably arranged at the end of the valve body.

[0015] Optionally, the chip-mounted proportional directional valve is also provided with a valve shaft and a valve core, and the valve body is provided with a high-pressure flow channel, a low-pressure flow channel and a working port, the high-pressure flow channel passes through the valve body and is connected to the P port, and the low-pressure flow channel passes through the valve body and is connected to the T port; the valve shaft is rotatably arranged inside the valve body, and the outer circumferential surface of the valve shaft is provided with a high-pressure flow groove, a low-pressure flow groove and a working flow groove arranged along the circumferential direction, and the inner circumferential surface of the valve shaft is provided with a high-pressure annular groove connected to the high-pressure flow groove, a low-pressure annular groove connected to the low-pressure flow groove, and a working annular groove connected to the working flow groove, and the valve shaft can rotate relative to the valve body to control the connection and disconnection of the high-pressure flow groove and the high-pressure flow channel, the connection and disconnection of the low-pressure flow groove and the low-pressure flow channel, and the connection and disconnection of the working flow groove and the working port; the valve core is located in the valve shaft and can reciprocate relative to the valve shaft to control the connection and disconnection relationship between the high-pressure annular groove, the low-pressure annular groove and the working annular groove.

[0016] Optionally, the valve shaft and the locking disk are arranged to rotate synchronously, and when the locking disk rotates until the opening is aligned with the hook, the valve shaft rotates until the high-pressure flow groove is disconnected from the high-pressure flow channel, the low-pressure flow groove is disconnected from the low-pressure flow channel, and the working flow groove is disconnected from the working port, and when the locking disk rotates until the opening is staggered from the hook, the valve shaft can rotate until the high-pressure flow groove is connected to the high-pressure flow channel, the low-pressure flow groove is connected to the low-pressure flow channel, and the working flow groove is connected to the working port.

[0017] Optionally, the plate-mounted proportional directional valve also includes a proportional solenoid, a gasket and a control spring, wherein the proportional solenoid is arranged at the end of the valve body, the gasket is arranged at the end of the valve core, and the control spring is located between the protruding end of the proportional solenoid and the gasket.

[0018] The plate-mounted proportional directional valve of the present invention has the following beneficial technical effects:

[0019] 1. In the present invention, by arranging a locking disk, a hook and a fixing pin on the valve body, the opening of the locking disk can be aligned with the hook during assembly, and the hook can be rotated outward to quickly connect the hook with the fixing pin. After the assembly is completed, the locking disk is rotated to stagger the opening with the hook to restrict the hook from rotating outward, thereby completing the connection of the adjacent plate-type installed proportional directional valves by using the hook and the fixing pin, and the hook and the fixing pin will not be disengaged, thereby achieving convenient and quick assembly and disassembly.

[0020] 2. In the present invention, by providing a locking piston, a rotating slider and a sliding spring, when the plate-type mounted proportional directional valve of the present invention works normally, by pushing the locking piston to slide outward, the hook can be pushed to overcome the sliding spring and slide relative to the rotating slider under the action of the piston inclined surface, and then the two valve bodies are tightened by the fixing pin to avoid leakage caused by pressure fluctuations during use.

[0021] 3. In the present invention, by setting the valve shaft and rotating the valve shaft, the high-pressure flow channel, the low-pressure flow channel and the working flow channel can be blocked to prevent the oil from flowing into the inner hole of the valve shaft, so that the internal parts can be replaced without the oil flowing out, and the replacement will not affect the use of other valves, thereby realizing online maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic cross-sectional structure diagram of the slice-type installed proportional directional valve of this embodiment;

[0023] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along the AA direction;

[0024] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure along the BB direction;

[0025] Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure along the CC direction;

[0026] Figure 5 for Figure 1 Schematic diagram of the cross-sectional structure along the DD direction;

[0027] Figure 6 for Figure 1 Schematic diagram of the cross-sectional structure along the EE direction;

[0028] Figure 7 for Figure 1 Schematic diagram of the cross-sectional structure along the FF direction;

[0029] Figure 8 for Figure 1 Schematic diagram of the cross-sectional structure along the GG direction;

[0030] Fig. 9 for Figure 1 Schematic diagram of the cross-sectional structure along the HH direction;

[0031] Fig.10 for Figure 1 Schematic diagram of the cross-sectional structure along direction II;

[0032] Fig.11It is a partial cross-sectional view of two plate-mounted proportional directional valves connected in this embodiment;

[0033] Fig.12 A partial cross-sectional view of the two-piece proportional directional valve installed in this embodiment when disassembled;

[0034] Fig.13 This is a schematic diagram of the proportional directional valves installed in slices in this embodiment connected in series to form a valve group. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0036] Combination Figures 1 to 13 As shown in FIG. 1 , the proportional directional valve of the present embodiment comprises a valve body 1, a first locking plate 2, a second locking plate 3, a hook 4 and a fixing pin 5. Among them, four hooks 4 are arranged on one connecting surface of the valve body 1, and four fixing pins 5 are arranged on the other connecting surface opposite to the valve body 1. Fig. 9 As shown, the upper surface is provided with four hooks 4, and the lower surface is provided with four fixing pins 5. Each hook 4 is rotatably connected to the valve body 1, and the first locking plate 2 and the second locking plate 3 are both rotatably arranged on the valve body 1, and openings 6 are provided on the first locking plate 2 and the second locking plate 3. The first locking plate 2 and the second locking plate 3 can be rotated relative to the valve body 1 until the openings 6 are aligned with the hooks 4 and the fixing pins 5, so that the hooks 4 on the valve body 1 can be rotated to connect or disconnect with the fixing pins 5 on the adjacent valve body 1, as shown in FIG. Fig.12 At the same time, the first locking plate 2 and the second locking plate 3 can also rotate until the opening 6 is misaligned with the hook 4 and the fixing pin 5 to limit the rotation of the hook 4 relative to the valve body 1, as shown in FIG. Fig.11 shown.

[0037] In the chip-mounted proportional directional valve of the present embodiment, by respectively arranging hooks and fixing pins on the two surfaces of the valve body that are fitted and connected with the front and rear adjacent valve bodies, and providing a locking disk with an opening and capable of rotation on the valve body, the connection between the hook and the fixing pin can be utilized when the adjacent valve bodies are fitted and connected to complete the quick connection between the adjacent valve bodies, and the rotation of the hook can be restricted by rotating the locking disk to prevent it from being unhooked, thereby ensuring the stability and reliability of the connection between the adjacent valve bodies through the hook and the fixing pin, and realizing convenient and quick assembly and disassembly of the chip-mounted proportional directional valve.

[0038] Among them, four hooks and four fixing pins are respectively arranged on the valve body of this embodiment, and the four hooks and four fixing pins are respectively located near the four corners of the connection surface, so that the fitting effect of the connection between two adjacent valve bodies can be improved, and thus, the first locking plate and the second locking plate are respectively arranged at the two ends of the valve body to facilitate the control of the rotation of the hook. Of course, in other embodiments, according to different design and use requirements, such as the difference in valve body size and system pressure, the number of hooks and fixing pins can be increased or decreased and the specific setting positions can be adjusted to meet different use requirements.

[0039] Combination Fig. 9 and Fig.10 As shown, a receiving groove 7 is provided at the position where the hook 4 and the fixing pin 5 are provided in the valve body 1, and the receiving groove 7 extends to the end surface of the valve body 1. In this way, by rotating the first locking plate 2 and the second locking plate 3 to control the alignment of the opening 6 and the receiving groove 7, it is possible to control whether the hook 4 can rotate. For example, when the opening 6 is aligned with the receiving groove 7, as shown in FIG. Fig.12 As shown, the hook 4 can rotate relative to the valve body 1 without being restricted, so as to achieve the connection and separation of the hook 4 and the fixing pin 5; when the opening 6 and the receiving groove 7 are staggered, as shown Fig.11 As shown, the hook 4 is restricted from rotating by the first locking disk 2 or the second locking disk 3 to maintain the connection between the hook 4 and the fixing pin 5 and prevent the hook 4 and the fixing pin 5 from being accidentally unhooked.

[0040] Combination Fig.11 and Fig.12 As shown, in the proportional directional valve installed in the sheet type in this embodiment, the hook 4 is rotatably arranged on the valve body 1 through the torsion spring 8, and the end of the hook 4 that can be connected with the fixing pin 5 is provided with a hook slope 9. When two adjacent valve bodies 1 are connected, the hook slope 9 can abut against the fixing pin 5 on the other valve body 1 and drive the hook 4 to overcome the torsion spring 8 and rotate to open. The hook 4 can also rotate under the action of the torsion spring 8 to connect with the fixing pin 5, that is, Fig.11 Position relationship shown.

[0041] In this embodiment, the hook is connected to the valve body by using a torsion spring, and a hook slope is set at the end of the hook. When connecting the hook and the fixing pin, the hook slope and the torsion spring can be used to achieve automatic and quick connection. When unhooking, it is only necessary to operate the hook to overcome the force of the torsion spring, thereby improving the convenience of connection and disassembly.

[0042] Combination Figures 9 to 12As shown, in the proportional directional valve of the present embodiment, a locking piston 10 is also provided, and a hook groove 11 is provided on the hook 4, and a rotating slider 12 and a sliding spring 13 are provided in the hook groove 11. The rotating slider 12 is coaxially arranged with the torsion spring 8, and the hook 4 can reciprocate relative to the rotating slider 12 in the direction of connection between two adjacent valve bodies 1, that is, the hook 4 can rotate relative to the valve body 1 together with the rotating slider 12, and can also reciprocate in a linear direction relative to the rotating slider 12. The sliding spring 13 is connected to the rotating slider 12 to drive the hook 4 to move in the extending direction, that is, to Fig.11 The other end of the hook 4 is provided with a hook pin 14, i.e. Fig.11 The lower end of the hook 4 is provided with a hook pin 14. A locking piston 10 is movably provided at the positions corresponding to the four hooks 4 on the valve body 1, and a piston slope 15 is provided at one end of the locking piston 10, that is, Fig.11 The left end of the locking piston 10 is provided with a piston slope 15. The locking piston 10 can move relative to the valve body 1 until the piston slope 15 abuts against the hook pin 14, so as to drive the hook 4 to overcome the sliding spring 13 and move in the retracting direction, that is, Fig.11 Move in the downward direction as shown.

[0043] In this embodiment, by providing a rotating slider and a sliding spring, the hook can be rotated under the action of the torsion spring and can also move in a linear direction. In this way, by further providing a hook pin and a locking piston, after the connection between the hook and the fixing pin is completed, the locking piston can be controlled to move toward the hook so that the inclined surface of the piston abuts against the hook pin, thereby driving the hook to overcome the sliding spring and move in the retracting direction, and then the two valve bodies are tightened by the fixing pin, thereby improving the connection firmness of the two valve bodies and avoiding leakage problems caused by pressure fluctuations during operation.

[0044] Combination Fig. 9 and Fig.10 As shown, a control channel 16 is also provided on the valve body 1 of this embodiment. The control channel 16 extends to the other end of each locking piston 10, that is, Fig. 9 and Fig.10 The locking piston 10 shown is not provided with an end of a piston slope, so that control oil is introduced to drive the locking piston 10 to move until the piston slope 15 abuts against the hook pin 14, thereby realizing the oil control action on the locking piston.

[0045] Further, combined with Figure 1 , Fig. 9 and Fig.10As shown, in this embodiment, the other end of the control channel 16 extends to communicate with the P port, so that the high-pressure oil at the P port can be used as the control oil for controlling the movement of the locking piston. Therefore, when the chip-mounted proportional directional valve is working, the high-pressure oil at the P port can be used to directly tighten the two valve bodies, eliminating the introduction of additional control oil and improving the integration of structure and control.

[0046] Combination Figures 1 to 13 As shown, in the proportional directional valve of the slice type installation of the present embodiment, a valve shaft 17 and a valve core 18 are further provided, and a high-pressure flow channel 19, a low-pressure flow channel 20, a first working port 21 and a second working port 22 are further provided on the valve body 1. The high-pressure flow channel 19 penetrates the valve body 1 and communicates with the high-pressure flow channel 19 on the adjacent valve body 1 and finally communicates with the P port, and the low-pressure flow channel 20 penetrates the valve body 1 and communicates with the low-pressure flow channel 20 on the adjacent valve body 1 and finally communicates with the T port. The valve shaft 17 is rotatably arranged inside the valve body 1, and the outer circumferential surface of the valve shaft 17 is provided with a high-pressure flow groove 23, a low-pressure flow groove 24, a first working flow groove 25 and a second working flow groove 26 arranged along the circumferential direction, and the inner circumferential surface of the valve shaft 17 is provided with a high-pressure annular groove 27 communicating with the high-pressure flow groove 23, a low-pressure annular groove 28 communicating with the low-pressure flow groove 24, a first working annular groove 29 communicating with the first working flow groove 25, and a second working annular groove 30 communicating with the second working flow groove 26. The valve shaft 17 can reciprocate relative to the valve body 1 to control the on-off relationship between the high-pressure flow groove 23 and the high-pressure flow channel 19, the on-off relationship between the low-pressure flow groove 24 and the low-pressure flow channel 20, the on-off relationship between the first working flow groove 25 and the first working port 21, and the on-off relationship between the second working flow groove 26 and the second working port 22. The valve core 18 is located in the valve shaft 17 and can reciprocate relative to the valve shaft 17 to control the on-off relationship between the high-pressure flow groove 23, the low-pressure flow groove 24, the first working flow groove 25, and the second working flow groove 26.

[0047] In this embodiment, a rotatable valve shaft is provided between the valve core and the valve body, and a flow groove and an annular groove are provided on the valve shaft. The connection between the flow channel on the valve body and the corresponding flow groove can be cut off by rotating the valve shaft, thereby preventing oil from flowing into the valve shaft when the valve core is disassembled and replaced. At the same time, online maintenance can be achieved without affecting the normal operation of other valves.

[0048] Combination Figure 1As shown, in the proportional directional valve installed in the plate type of this embodiment, the valve shaft 17 is synchronously rotated with the first locking disk 2 and the second locking disk 3, for example, connected by a pin shaft. When the first locking disk 2 and the second locking disk 3 rotate until the opening 6 is aligned with the hook 4, the valve shaft 17 rotates until the high-pressure flow groove 23 is disconnected from the high-pressure flow channel 19, the low-pressure flow groove 24 is disconnected from the low-pressure flow channel 20, the first working flow groove 25 is disconnected from the first working port 21, and the second working flow groove 26 is disconnected from the second working port 22. When the first locking disk 2 and the second locking disk 3 rotate until the opening 6 is staggered with the hook 4, the valve shaft 17 rotates until the high-pressure flow groove 23 is connected to the high-pressure flow channel 19, the low-pressure flow groove 24 is connected to the low-pressure flow channel 20, the first working flow groove 25 is connected to the first working port 21, and the second working flow groove 26 is connected to the second working port 22.

[0049] In this way, when the locking disk is rotated until the opening is aligned with the hook to connect or unhook the hook and the fixing pin, the valve shaft can be driven to rotate to a blocking state for each flow channel at the same time, thereby further improving the integration of structure and control.

[0050] Combination Figures 2 to 8 As shown, in this embodiment, the high-pressure flow groove 23, the low-pressure flow groove 24, the first working flow groove 25 and the second working flow groove 26 arranged on the valve shaft 17 are all arc grooves with a central angle of 90°, and the four openings 6 on the first locking plate 2 and the second locking plate 3 are not evenly distributed along the circumferential direction. Figure 7 and Figure 8 The opening 6 and the hook 4 are in a staggered position, and the first locking plate 2 and the second locking plate 3 can be rotated 90 degrees in this state to align the opening 6 with the hook 4. In this way, when the first locking plate and the second locking plate are rotated 90 degrees, the switching of the alignment relationship between the opening and the hook and the switching of the on-off relationship between the flow slot and the corresponding flow channel can be completed, and when the first locking plate and the second locking plate are rotated 180 degrees, the switching relationship between the flow slot and the corresponding flow channel can be changed while keeping the alignment relationship between the opening and the hook unchanged.

[0051] In addition, combined Figure 1 As shown, in the slice-type mounted proportional directional valve of this embodiment, a proportional electromagnet 31, a gasket 32 ​​and a control spring 33 are further provided, a proportional electromagnet 31 is respectively provided at both ends of the valve body 1, the gasket 32 ​​is arranged at the end of the valve core 18, and the control spring 33 is located between the extended end of the proportional electromagnet 31 and the gasket 32. In this way, the action of the valve core can be controlled by the proportional electromagnet and the control spring, so as to realize the operation of the slice-type mounted proportional directional valve.

[0052] Combination Figures 1 to 13 As shown, the specific working process of the slice-type proportional directional valve of this embodiment is as follows:

[0053] When it is necessary to use the slice-type mounted proportional directional valve of this embodiment to assemble into a valve group, first, the first joint valve plate is fixedly connected to the first slice-type mounted proportional directional valve of this embodiment, so that the P port on the first joint valve plate is connected to the high-pressure flow channel 19, and the T port is connected to the low-pressure flow channel 20. Then, the first locking disk 2 on all the slice-type mounted proportional directional valves is rotated 90 degrees clockwise, so that the first locking disk 2 drives the valve shaft 17 and the second locking disk 3 to rotate synchronously, so that the hook 4 is aligned with the opening 6, and all the slice-type mounted proportional directional valves are switched to the connected state. Then, the hook 4 and the fixing pin 5 on the two adjacent slice-type mounted proportional directional valves are aligned and inserted, and the hook slope 9 is abutted against the fixing pin 5 and the hook 4 is pushed to overcome the torsion spring 8. After rotating to make room, the two valve bodies 1 continue to move in the fitting direction. When the two valve bodies 1 are fitted together, the hook 4 rotates in the opposite direction under the action of the torsion spring 8 and hooks the fixing pin 5. After all the valve bodies 1 are hung together, all the first locking disks 2 are controlled to rotate 90 degrees counterclockwise, so that the first locking disk 2 drives the valve shaft 17 and the second locking disk 3 to rotate synchronously, so that the hook 4 is staggered with the opening 6, and the first locking disk 2 and the second locking disk 3 are used to block the hook 4 so that the hook 4 cannot rotate outward. Finally, the tail-joined valve plate is fixedly connected to the last proportional directional valve installed in the sheet type of this embodiment, so that the tail-joined valve plate blocks the high-pressure flow channel 19 and the low-pressure flow channel 20, and the proportional directional valve installed in the sheet type of this embodiment is assembled into a valve group.

[0054] When the valve group composed of the slice-type proportional directional valves of this embodiment works normally, high-pressure oil is introduced into the P port, and the high-pressure oil enters the high-pressure flow channel 19, and controls the sliding of the valve core 18 through the proportional solenoid 31, thereby changing the direction of the oil circuit under the cooperation of the control spring 33 and the valve shaft 17 to achieve normal function. At the same time, the high-pressure oil at the P port flows to the locking piston 10 through the control flow channel 16, thereby pushing the locking piston 10 to extend outward, so that the piston inclined surface 15 abuts against the hook pin 14, pushing the hook 4 to overcome the sliding spring 13 to slide, so that the hook 4 pulls the fixing pin 5 to further tighten and fix the two valve bodies 1.

[0055] When the valve group composed of the slice-type proportional directional valves of the present embodiment has been working for a long time and one of the slice-type proportional directional valves needs to be maintained, first, the first locking disk 2 in the corresponding slice-type proportional directional valve is driven to drive the valve shaft 17 and the second locking disk 3 to rotate 180 degrees counterclockwise, so that the hook 4 continues to be staggered with the opening 6 and cannot rotate outward, and the high-pressure flow groove 23, the low-pressure flow groove 24, the first working flow groove 25 and the second working flow groove 26 are rotated to the high-pressure flow channel 19 and the low-pressure flow channel 19 respectively. 20. Disconnect the first working port 21 and the second working port 22, then disassemble the proportional solenoids 31 at both ends of the valve body 1, and then disassemble and replace the gasket 32, the control spring 33 and the valve core 18. At this time, the high-pressure flow channel 19, the low-pressure flow channel 20, the first working port 21 and the second working port 22 on the valve body 1 are all in a blocked state and no oil will flow into the valve shaft 17. In addition, the high-pressure flow channel 19 and the low-pressure flow channel 20 on each valve body 1 are in a connected state, which does not affect the normal operation of other valves. After completing the replacement of parts, the first locking disk 2 can be driven to rotate 180 degrees clockwise to return to the normal working state to complete the maintenance work.

[0056] When the valve group composed of the proportional directional valve installed in the sheet type of this embodiment needs to be disassembled, first, stop the delivery of high-pressure oil at the P port, reduce the oil pressure at the P port to zero, release the effect of the locking piston 10 on the hook 4, then drive the first locking plate 2 to rotate 90 degrees counterclockwise, drive the valve shaft 17 and the second locking plate 3 to rotate synchronously, so that the opening 6 is aligned with the hook 4, and then drive the hook 4 to overcome the force of the torsion spring 8 to rotate and separate from the fixing pin 5, thereby separating the two adjacent valve bodies 1 to complete the disassembly.

Claims

1. A plate-mounted proportional directional valve, characterized in that: It comprises a valve body, a locking plate, a hook and a fixing pin; the hook is provided on one connecting surface of the valve body, and the fixing pin is provided on the other connecting surface opposite to the hook; the hook is rotatably connected to the valve body, and the locking plate is rotatably arranged on the valve body, and an opening is provided on the locking plate; the locking plate can be rotated relative to the valve body until the opening is aligned with the hook and the fixing pin, so that the hook on the valve body can be rotated to form a connection or decoupling with the fixing pin on the adjacent valve body; the locking plate can be rotated until the opening is misaligned with the hook and the fixing pin to limit the rotation of the hook relative to the valve body.

2. The plate-mounted proportional directional valve according to claim 1, characterized in that: The hook is rotatably arranged on the valve body through a torsion spring, and one end of the hook that can be connected with the fixing pin is provided with a hook slope; when two adjacent valve bodies are connected, the hook slope can abut against the fixing pin on the other valve body and drive the hook to overcome the torsion spring and rotate to open, and the hook can rotate under the action of the torsion spring to form a connection with the fixing pin.

3. The plate-mounted proportional directional valve according to claim 2, characterized in that: The plate-type mounted proportional directional valve is also provided with a locking piston; a hook groove is provided on the hook, a rotating slider and a sliding spring are provided in the hook groove, the rotating slider is coaxially rotatably arranged with the torsion spring, the hook can reciprocate relative to the rotating slider along the direction in which two adjacent valve bodies are connected, and the sliding spring is connected to the rotating slider to drive the hook to move in the extending direction; a hook pin is provided at the other end of the hook, the locking piston is movably arranged on the valve body, and a piston slope is provided at one end of the locking piston, the locking piston can move relative to the valve body until the piston slope abuts against the hook pin, so as to drive the hook to overcome the sliding spring and move in the retracting direction.

4. The plate-mounted proportional directional valve according to claim 3, characterized in that: The valve body is provided with a control flow channel; the control flow channel extends to the other end of the locking piston, so as to introduce control oil to drive the locking piston to move until the piston slope abuts against the hook pin.

5. The plate-mounted proportional directional valve according to claim 4, characterized in that: The control flow channel is communicated with the P port.

6. The plate-mounted proportional directional valve according to claim 1, characterized in that: The valve body is provided with a plurality of hooks and a plurality of fixing pins, and the locking disk is provided with a plurality of openings, and the plurality of openings can rotate with the locking disk to be aligned with or staggered with the plurality of hooks and the plurality of fixing pins.

7. The plate-mounted proportional directional valve according to claim 6, characterized in that: The plurality of hooks and the plurality of fixing pins are arranged at end positions close to the valve body, and the locking plate is rotatably arranged at the end of the valve body.

8. The plate-mounted proportional directional valve according to any one of claims 1 to 7, characterized in that: The plate-mounted proportional directional valve is also provided with a valve shaft and a valve core, and the valve body is provided with a high-pressure flow channel, a low-pressure flow channel and a working port, the high-pressure flow channel passes through the valve body and is connected to the P port, and the low-pressure flow channel passes through the valve body and is connected to the T port; the valve shaft is rotatably arranged inside the valve body, and the outer circumferential surface of the valve shaft is provided with a high-pressure flow groove, a low-pressure flow groove and a working flow groove arranged along the circumferential direction, and the inner circumferential surface of the valve shaft is provided with a high-pressure annular groove connected to the high-pressure flow groove, a low-pressure annular groove connected to the low-pressure flow groove, and a working annular groove connected to the working flow groove, and the valve shaft can rotate relative to the valve body to control the connection and disconnection of the high-pressure flow groove and the high-pressure flow channel, the connection and disconnection of the low-pressure flow groove and the low-pressure flow channel, and the connection and disconnection of the working flow groove and the working port; the valve core is located in the valve shaft and can reciprocate relative to the valve shaft to control the connection and disconnection relationship between the high-pressure annular groove, the low-pressure annular groove and the working annular groove.

9. The plate-mounted proportional directional valve according to claim 8, characterized in that: The valve shaft and the locking disk are arranged to rotate synchronously. When the locking disk rotates until the opening is aligned with the hook, the valve shaft rotates until the high-pressure flow groove is disconnected from the high-pressure flow channel, the low-pressure flow groove is disconnected from the low-pressure flow channel, and the working flow groove is disconnected from the working port. When the locking disk rotates until the opening is staggered from the hook, the valve shaft can rotate until the high-pressure flow groove is connected to the high-pressure flow channel, the low-pressure flow groove is connected to the low-pressure flow channel, and the working flow groove is connected to the working port.

10. The plate-mounted proportional directional valve according to claim 8, characterized in that: The plate-mounted proportional directional valve also includes a proportional solenoid, a gasket and a control spring. The proportional solenoid is arranged at the end of the valve body, the gasket is arranged at the end of the valve core, and the control spring is located between the protruding end of the proportional solenoid and the gasket.

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