Hydraulic motor single spill valve assembly structure

Abstract

The application discloses a hydraulic motor single overflow valve assembly structure and relates to the technical field of hydraulic motors.The hydraulic motor single overflow valve assembly structure comprises a valve body, a valve cover arranged on the valve body, an overflow valve assembly assembled on the valve body, a flow distribution disc and a plunger motor arranged in the valve body, a plunger connected to a nine-hole disc on the plunger motor, a lotus-shaped output shaft fixedly connected to the bottom of the nine-hole disc, and two cavities A and B arranged on the flow distribution disc.The hydraulic motor oil path structure is adjusted, the single overflow valve assembly structure is adopted, the motor oil return shares one common overflow channel, the oil path is switched through the form of the added check valve, the working switching process of the single overflow valve assembly is realized, the demand for the number of overflow valve assemblies is reduced, the cost of products is greatly reduced, and the residual metal iron scraps in the hydraulic oil can be recycled regardless of the working state of the plunger motor, namely, the forward rotation or the reverse rotation, so that the maintenance process is more standardized and efficient.

Description

Technical Field

[0001] This invention relates to the field of hydraulic motor technology, specifically to a single relief valve assembly structure for a hydraulic motor. Background Technology

[0002] A hydraulic motor is a core actuator in a hydraulic system. Essentially, it's an energy conversion device that transforms the pressure energy of a liquid into rotational mechanical energy. It's commonly used as a power output component to drive various mechanical equipment and has extremely wide applications in industry. In the hydraulic motor's operating circuit, the relief valve assembly is a crucial pressure control component that ensures reliable motor operation and maintains system stability. When a hydraulic motor encounters a sudden overload, the circuit pressure will surge instantly, far exceeding the pressure limits of the motor and pipelines. At this time, the relief valve assembly directly discharges the high-pressure oil back to the oil tank, preventing damage such as internal seal rupture, drive shaft breakage, and housing rupture. It also prevents high pressure from impacting the upstream hydraulic pump and other components.

[0003] Currently, overflow protection and oil replenishment solutions for bidirectional hydraulic motors mainly fall into two categories. One category uses two independent overflow valve assemblies corresponding to the two working chambers of the motor, setting overload pressures for the forward and reverse directions respectively. An independent oil replenishment pump and a replenishment check valve assembly are also configured to replenish oil to the low-pressure side. The other category integrates the two overflow valve assemblies inside the motor valve cover, eliminating the need for external connecting pipelines. However, the overflow valve assembly is difficult to manufacture and requires precise product fit during assembly. Firstly, the above approach occupies a large installation space, hindering the miniaturization design of the entire machine. More importantly, the multiple overflow valve assemblies can easily lead to inconsistent pressures. Since the spring preload and wear of the overflow valve assembly are easily affected, when the bidirectional braking characteristics are unbalanced, impacts and uneven loads are highly likely to occur. Therefore, existing hydraulic motors still have shortcomings in overflow protection and oil replenishment processes, and improvements are still needed in terms of low cost and high integration. Summary of the Invention

[0004] The purpose of this invention is to provide a single relief valve assembly structure for a hydraulic motor, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a hydraulic motor single relief valve assembly structure, including a valve body, a valve cover provided on the valve body, a relief valve assembly assembled on the valve body, a distribution plate and a plunger motor provided inside the valve body, the plunger on the plunger motor being connected to a nine-hole plate, a lotus output shaft being fixedly connected to the bottom of the nine-hole plate, and two cavities A and B being provided on the distribution plate; The valve cover has an oil passage port 1 and an oil passage port 2 that are respectively connected to cavities A and B. The valve body also has two one-way valves 1 on its side, which are respectively located in cavities A and B. The output ends of the two one-way valves 1 are connected through a channel 1. The overflow valve assembly is connected to a common overflow channel, which is connected to the channel 1. One-way valves 2 are provided on both sides of the common overflow channel, and the output ends of the two one-way valves 2 are respectively connected to cavities A and B through the channel 2.

[0006] Optionally, both oil inlet one and oil inlet two have positioning and mounting holes on their outer periphery, and hydraulic oil pipes are fixedly installed through the positioning and mounting holes.

[0007] Optionally, an intercepting net is fixedly connected to the inner wall of the hydraulic oil pipe. The intercepting net is inclined, and filtering components are provided on both the high and low sides of the intercepting net.

[0008] Optionally, the filter component includes a cavity formed in the inner wall of the hydraulic oil pipe, an isolation plate slidably connected to the inner wall of the cavity, the isolation plate being adapted to the cavity, an electromagnetic actuator embedded in the hydraulic oil pipe, the output end of the electromagnetic actuator being fixedly connected to the end of the isolation plate, and a sealing ring embedded in the inner wall of the cavity, the sealing ring being installed on the outside of the output end of the electromagnetic actuator.

[0009] Optionally, the hydraulic oil pipe is rotatably connected to a signal recognition plate via a torsion spring. The signal recognition plate is tilted in the opposite direction to the interception net. A sensing chip is installed inside the signal recognition plate, and a sensing component corresponding to the sensing chip is installed inside the electromagnetic driver.

[0010] Optionally, the first cavity and the inner wall of the hydraulic oil pipe are slidably connected to a drip filter plate. The inner wall of the hydraulic oil pipe is provided with a second cavity that communicates with the first cavity. The second cavity extends into the hydraulic oil pipe. The inner wall of the second cavity is provided with an arc-shaped closing plate. The communication state between the first cavity and the second cavity is changed by the arc-shaped closing plate. The inner wall of the hydraulic oil pipe is provided with an arc-shaped groove that matches the arc-shaped closing plate.

[0011] Optionally, a disc is fixedly connected to the end of the drip filter plate, and a ring is rotatably connected to the outer circumference of the disc. The arc-shaped closed plate is fixedly connected to the surface of the ring.

[0012] Optionally, the inner wall of the hydraulic oil pipe is embedded with two magnets, the surface of the ring is embedded with two sensing iron plates corresponding to the magnets, and an operating handle is fixedly connected to the surface of the ring. The surface of the operating handle is provided with anti-slip texture.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: Because the relief valve assembly is difficult to manufacture and requires precise product fit, this invention adjusts the oil circuit structure of the hydraulic motor and adopts a single relief valve assembly structure. The motor oil return shares a common relief channel, and the oil circuit switching is achieved by adding a check valve. This reduces the number of relief valve assemblies required and greatly reduces the product cost. By directly integrating the rectifier oil circuit and the common overflow route into the cast flow channel inside the valve cover, the check valve and the overflow valve share the same integrated flow channel, further reducing the number of cartridge joints and seals. This results in fewer leakage points than existing technologies and a higher overall integration.

[0014] Second, this invention can recycle residual metal filings in hydraulic oil regardless of whether the piston motor is rotating forward or backward, greatly improving the product's service life. At the same time, the special tilt setting increases the area of ​​the interception net, reducing the chance of the interception net getting clogged and reducing the number of times it needs to be cleaned and maintained.

[0015] Third, when the present invention needs to collect and maintain the intercepted iron filings, the hydraulic oil around the iron filings can be significantly reduced in advance to avoid the situation where hydraulic oil spills all over the ground when the drip filter plate is pulled out. At the same time, the setting of the induction iron plate and magnet can prevent personnel from missing this step during operation, making the maintenance steps of this hydraulic motor more standardized. Attached Figure Description

[0016] Figure 1 This is the first isometric view of the present invention; Figure 2 This is the second isometric view of the present invention; Figure 3 This is a first sectional view from the frontal perspective of the present invention; Figure 4 This is a right-view sectional view of the present invention; Figure 5 This is a first sectional view of the invention from a top-down perspective on the right. Figure 6 This is a second sectional view of the invention from a top-down perspective on the right. Figure 7 This is a second sectional view from the frontal perspective of the present invention; Figure 8 This is a schematic diagram of the hydraulic oil pipe structure of the present invention; Figure 9 This is a diagram showing the positional relationship between the interception net and the hydraulic oil pipe of this invention; Figure 10 For the present invention Figure 9 Enlarged view of the structure at point A in the middle; Figure 11 This is a schematic diagram illustrating the constraint of the circular ring of the present invention; Figure 12 This is a hydraulic schematic diagram of the present invention.

[0017] In the diagram: 1. Valve body; 2. Valve cover; 3. Relief valve assembly; 4. Distribution plate; 5. Piston motor; 6. Nine-hole plate; 7. Lotus output shaft; 8. Oil port one; 9. Oil port two; 10. Check valve one; 11. Channel one; 12. Common overflow channel; 13. Check valve two; 14. Channel two; 15. Positioning mounting hole; 16. Hydraulic oil pipe; 17. Interception net; 18. Cavity one; 19. Isolation plate; 20. Electromagnetic actuator; 21. Sealing ring; 22. Signal recognition board; 23. Drip filter plate; 24. Cavity two; 25. Arc-shaped closing plate; 26. Disc; 27. Ring; 28. Magnet; 29. ​​Induction iron plate; 30. Operating handle. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1, please refer to Figures 1 to 7 , Figure 12 This invention provides a hydraulic motor single relief valve assembly structure, including a valve body 1, a valve cover 2 on the valve body 1, and a relief valve assembly 3 mounted on the valve body 1. The valve body 1 also contains a distribution plate 4, a plunger motor 5, and a plunger on the plunger motor 5 connected to a nine-hole plate 6. A lotus output shaft 7 is fixedly connected to the bottom of the nine-hole plate 6. The distribution plate 4 has two cavities, A and B. The surface of the valve cover 2 has an oil passage port 8 and an oil passage port 9 communicating with cavities A and B respectively. Hydraulic oil enters through the oil passage port 8, passes through cavity A of the distribution plate 4, and enters the bottom chamber of the plunger at the corresponding position on the plunger motor 5, pushing the plunger... The piston is pushed outward, so that its head is pressed tightly against the end face of the inclined nine-hole disc 6. The reaction force of the nine-hole disc 6 on the piston can be decomposed into two components. Along the piston axis, it is balanced with the hydraulic pressure at the bottom of the piston and does not generate a rotational torque. However, perpendicular to the piston axis, it generates a tangential torque on the central axis of the piston motor 5, which drives the piston motor 5 to rotate around the axis. When the piston motor 5 rotates, the piston that has completed its work will rotate to the position of cavity B of the distribution disc 4. The piston is pushed back into the cylinder by the nine-hole disc 6, and the low-pressure oil is discharged from cavity B and then from the oil outlet 2 9. At the same time, the next piston rotates to the position of cavity A and repeats the above thrust process, thus continuing to rotate.

[0020] Since the diameter and pressure rating of oil inlet 8 and oil inlet 9 are exactly the same, when a change of direction is required, only the direction of hydraulic oil input needs to be changed. That is, the original oil inlet port 8 becomes the oil return port, and the original oil return port oil inlet 9 becomes the oil inlet port.

[0021] Two check valves 10 are also provided on the side of the valve body 1. The two check valves 10 are respectively located in cavity A and cavity B. The output ends of the two check valves 10 are connected through channel 11. The overflow valve assembly 3 is connected to a common overflow channel 12, which is connected to channel 11. Check valves 13 are provided on both sides of the common overflow channel 12. The output ends of the two check valves 13 are respectively connected to cavities A and B through channel 14.

[0022] In this embodiment: See Figure 12 The hydraulic schematic diagram illustrates the process. Under normal forward rotation, high-pressure oil enters cavity A through port 8, driving the piston motor 5 to rotate forward. Low-pressure oil, after work, flows out from cavity B. At this time, cavity A has normal pressure, while cavity B has positive pressure. Both check valves 10 are closed, and oil flows only in the main circuit of piston motor 5. When the motor brakes suddenly, the pressure in cavity A rises sharply, opening check valve 10. High-pressure oil flows into channel 11 and then through the common overflow channel 12, pushing the valve core of the overflow valve assembly 3 to open and release pressure. The high-pressure oil overflows into the common low-pressure cavity. Since cavity B is under negative pressure, check valve 13 in cavity B automatically opens, allowing the overflowing oil to directly replenish cavity B through channel 14, preventing air cavitation and reducing peak pressure. The entire process is a closed-loop buffer.

[0023] During normal reverse operation, high-pressure oil enters from cavity B at oil port 29, driving piston motor 5 to reverse. At this time, the structural operation principle is the same as described above, but the motion pattern is the opposite. High-pressure oil also enters the common overflow channel 12 through channel 11. Through the above process, the overflow effect can be achieved on both the left and right sides.

[0024] Because the relief valve assembly 3 is difficult to manufacture and requires precise product fit, this structure adjusts the hydraulic motor's oil circuit structure and adopts a single relief valve assembly 3 structure, sharing a common relief channel 12. By adding a check valve to switch the oil circuit, the working switching process of the single relief valve assembly 3 is realized, reducing the number of relief valve assemblies 3 required and greatly reducing the product cost.

[0025] Example 2, based on the above examples: Please see Figure 1 , Figure 8 and Figure 9Both oil inlet 8 and oil inlet 9 have positioning and mounting holes 15 on their outer periphery, and hydraulic oil pipes 16 are fixedly installed through the positioning and mounting holes 15. An interception net 17 is fixedly connected to the inner wall of the hydraulic oil pipe 16. The interception net 17 is set at an angle, and filter components are set on both the high and low sides of the interception net 17.

[0026] In this embodiment: considering that when the piston motor 5 is working, the hydraulic oil rubs against the inner wall of the piston motor 5, which will produce metal debris mixed in the hydraulic oil. Over time, this will reduce the quality of the hydraulic oil and affect the working efficiency of the piston motor 5. By setting the interception net 17, metal impurities can be intercepted, preventing most impurities from entering the interior of the piston motor 5 and causing damage to the internal precision components, thus extending the service life. The special setting of the inclined state increases the area of ​​the interception net 17, which reduces the probability of the interception net clogging to a certain extent and reduces the number of times cleaning and maintenance are required. Simultaneously, the flow of hydraulic oil can move iron filings and impurities on the interception net 17 to the side of the interception net 17, such as... Figure 9 As shown, if the hydraulic oil flows from bottom to top, the iron filings will move to the upper right side; if the hydraulic oil flows from top to bottom, the impurities on that side will be pushed into the filter component on the lower right side. The filter component will collect the iron filings and impurities on that side. This design allows for the collection and processing of impurities regardless of whether the piston motor 5 is rotating forward or backward.

[0027] Example 3, based on the above examples: Please see Figure 9 and Figure 10 The filter component includes a cavity 18 formed in the inner wall of the hydraulic oil pipe 16. An isolation plate 19 is slidably connected to the inner wall of the cavity 18. The isolation plate 19 is adapted to the cavity 18. An electromagnetic actuator 20 is embedded in the hydraulic oil pipe 16. The output end of the electromagnetic actuator 20 is fixedly connected to the end of the isolation plate 19. A sealing ring 21 is embedded in the inner wall of the cavity 18. The sealing ring 21 is installed on the outside of the output end of the electromagnetic actuator 20. In this embodiment, the electromagnetic driver 20 can drive the isolation plate 19 to extend or retract. When extended, it can isolate the cavity 18. If the working state of the piston motor 5 changes, this can prevent the collected iron filings from flowing out again and avoid causing damage again. Since the hydraulic oil pipe 16 is rotatably connected to the signal recognition plate 22 through the torsion spring, the signal recognition plate 22 is tilted in the opposite direction to the interception net 17. The signal recognition plate 22 is equipped with a sensing chip, and the electromagnetic driver 20 is equipped with a sensing component corresponding to the sensing chip.

[0028] Depend on Figure 10It can be seen that when the hydraulic oil flows from bottom to top, it will push the signal recognition plate 22, which is tilted in the opposite direction to the interception net 17, to deflect. This means that the signal recognition plate 22 is close to the electromagnetic driver 20. At this time, the internal sensing chip and the sensing components in the electromagnetic driver 20 cooperate to drive the electromagnetic driver 20. That is, at this time, the isolation plate 19 retracts and the cavity 18 is in an open state. Similarly, the signal recognition plate 22 on the other side is not in contact with the position of the electromagnetic driver 20 because its opening is facing the hydraulic oil. The cavity 18 on this side is in a closed state.

[0029] It should be emphasized that the electromagnetic actuator 20 can also be started by manually connecting an external control sensor, that is, the control state of the electromagnetic actuator 20 can be automatically changed according to the flow direction of the hydraulic oil.

[0030] Example 4, based on the above examples: Please see Figure 9 and Figure 10 A drip filter plate 23 is slidably connected to the inner wall of cavity 18 and hydraulic oil pipe 16. A cavity 24 connected to cavity 18 is opened on the inner wall of hydraulic oil pipe 16. Cavity 24 extends into hydraulic oil pipe 16. An arc-shaped closing plate 25 is provided on the inner wall of cavity 24. The communication state between cavity 18 and cavity 24 is changed by the arc-shaped closing plate 25. An arc-shaped groove adapted to the arc-shaped closing plate 25 is opened on the inner wall of hydraulic oil pipe 16. A disc 26 is fixedly connected to the end of the drip filter plate 23. A ring 27 is rotatably connected to the outer circumference of the disc 26. An arc-shaped closing plate 25 is fixedly connected to the surface of the ring 27. Two magnets 28 are embedded in the inner wall of the hydraulic oil pipe 16. Two sensing iron pieces 29 corresponding to the magnets 28 are embedded in the surface of the ring 27. An operating handle 30 is fixedly connected to the surface of the ring 27. The surface of the operating handle 30 is provided with anti-slip texture.

[0031] In this embodiment: When the plunger motor 5 is not working, some of the hydraulic oil in the hydraulic oil pipe 16 can be pre-emptively discharged. Then, the iron filings in the cavity 18 are processed. At this time, after the operator holds the operating handle 30, it needs to be slightly rotated to make the ring 27 rotate, causing the inductive iron plate 29 to be misaligned with the magnet 28. Then, the operating handle 30 can be pulled normally to pull out the disc 26 through the ring 27. The disc 26 can then pull out the drip filter plate 23 along with the debris on it, and the debris can be collected normally. During the deflection of the ring 27, the arc-shaped closing plate 25 will be driven to deflect synchronously. Since the arc-shaped closing plate 25 initially isolates the cavity 24 and the cavity 18 from each other, after the deflection, the two will be in a connected state. At this time, the hydraulic oil mixed with metal filings inside the cavity 18 will flow back into the hydraulic oil pipe 16 through the cavity 24 and be discharged together.

[0032] By using the above method, the hydraulic oil in the cavity can be significantly reduced in advance during each cleaning of metal debris, avoiding the situation where hydraulic oil spills all over the ground at the opening when the drip filter plate is pulled out. At the same time, the setting of the induction iron plate 29 and the magnet 28 can prevent personnel from missing this step during operation, making the operation process more standardized.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydraulic motor single relief valve assembly structure, comprising a valve body (1), characterized in that: The valve body (1) is provided with a valve cover (2), the valve body (1) is equipped with an overflow valve assembly (3), the valve body (1) is also provided with a distribution plate (4), a plunger motor (5), the plunger on the plunger motor (5) is connected to a nine-hole plate (6), the bottom of the nine-hole plate (6) is fixedly connected with a lotus output shaft (7), and the distribution plate (4) is provided with two cavities A and B; The surface of the valve cover (2) is provided with an oil passage port 1 (8) and an oil passage port 2 (9) that are respectively connected to the two cavities A and B. The side of the valve body (1) is also provided with two one-way valves 1 (10). The two one-way valves 1 (10) are respectively located in the A cavity and the B cavity. The output ends of the two one-way valves 1 (10) are connected through the channel 1 (11). The overflow valve assembly (3) is connected to a common overflow channel (12). The common overflow channel (12) is connected to the channel 1 (11). One-way valves 2 (13) are provided on both sides of the common overflow channel (12). The output ends of the two one-way valves 2 (13) are respectively connected to the two cavities A and B through the channel 2 (14). Both the first oil outlet (8) and the second oil outlet (9) have positioning mounting holes (15) on their outer periphery, and hydraulic oil pipes (16) are fixedly installed through the positioning mounting holes (15). The inner wall of the hydraulic oil pipe (16) is fixedly connected to an interception net (17), the interception net (17) is inclined, and filter components are provided on both the high and low sides of the interception net (17); The filter component includes: A cavity (18) is formed on the inner wall of the hydraulic oil pipe (16). An isolation plate (19) is slidably connected to the inner wall of the cavity (18). The isolation plate (19) is adapted to the cavity (18). An electromagnetic actuator (20) is embedded in the hydraulic oil pipe (16). The output end of the electromagnetic actuator (20) is fixedly connected to the end of the isolation plate (19). A sealing ring (21) is embedded in the inner wall of the cavity (18). The sealing ring (21) is installed on the outside of the output end of the electromagnetic actuator (20). The inner wall of the first cavity (18) and the inner wall of the hydraulic oil pipe (16) are slidably connected to a drip filter plate (23). The inner wall of the hydraulic oil pipe (16) is provided with a second cavity (24) that communicates with the first cavity (18). The second cavity (24) extends into the hydraulic oil pipe (16). The inner wall of the second cavity (24) is provided with an arc-shaped closing plate (25). The communication state between the first cavity (18) and the second cavity (24) is changed by the arc-shaped closing plate (25). The inner wall of the hydraulic oil pipe (16) is provided with an arc-shaped groove that matches the arc-shaped closing plate (25).

2. The hydraulic motor single relief valve assembly structure according to claim 1, characterized in that: The hydraulic oil pipe (16) is rotatably connected to a signal recognition plate (22) via a torsion spring. The signal recognition plate (22) is tilted in the opposite direction to the interception net (17). A sensing chip is provided inside the signal recognition plate (22), and a sensing component corresponding to the sensing chip is provided inside the electromagnetic driver (20).

3. The hydraulic motor single relief valve assembly structure according to claim 2, characterized in that: The end of the drip filter plate (23) is fixedly connected to a disc (26), and a ring (27) is rotatably connected to the outer circumference of the disc (26). The arc-shaped closed plate (25) is fixedly connected to the surface of the ring (27).

4. The hydraulic motor single relief valve assembly structure according to claim 3, characterized in that: The inner wall of the hydraulic oil pipe (16) is embedded with two magnets (28), and the surface of the ring (27) is embedded with two sensing iron pieces (29) corresponding to the magnets (28). The surface of the ring (27) is fixedly connected with an operating handle (30), and the surface of the operating handle (30) is provided with anti-slip texture.

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