Buffering overflow valve

Abstract

The invention relates to the technical field of overflow valves, and particularly discloses a buffer overflow valve which comprises a main valve body and a pilot valve body communicated with the main valve body, and a circular cavity is formed in the main valve body and used for oil circulation; a cylinder is arranged in the circular cavity, used for blocking the circular cavity and capable of sliding and rotating in the circular cavity under the action of oil pressure, and a damping hole coaxial with the circular cavity is formed in the cylinder and used for generating resistance to oil flowing in the circular cavity, so that pressure difference is generated in the space on the upper side and the space on the lower side of the cylinder; according to the buffer overflow valve, when oil pressure pushes the cylinder to move or the first spring pushes the cylinder to move, the wing plate can automatically scrape and clean impurities on the damping hole, so that the impurities fall off from the inner wall of the damping hole and are discharged along with oil liquid, and the situation that the impurities stay in the damping hole to block circulation of the oil liquid is effectively avoided; when the overflow valve is started and closed, the damping hole can be cleaned at a time.

Description

Technical Field

[0001] The present invention relates to the technical field of overflow valves, and particularly relates to a buffer overflow valve. Background Art

[0002] Overflow valves usually adopt a pilot-operated structure and consist of two parts: a main valve and a pilot valve. When the system pressure is lower than the set pressure of the pilot valve, the pilot valve closes, the pressures in the upper and lower chambers of the main valve core are equal, and the main valve core is in a closed state under the action of the spring force, and the valve port does not overflow. When the system pressure rises to the set pressure of the pilot valve, the pilot valve opens, and the oil in the upper chamber of the main valve core flows back to the fuel tank through the pilot valve, reducing the pressure in the upper chamber of the main valve core. The main valve core moves upward under the action of the pressure difference between the upper and lower chambers, overcoming the spring force, opening the valve port, and achieving overflow, thereby limiting the system pressure to the set pressure value. The damping hole is an essential structure in the overflow valve and is usually located on the main valve core or the pilot valve core of the overflow valve to generate a pressure difference inside the valve body so that the main valve core can be opened.

[0003] A patent document with the publication number CN117570076B discloses an overflow valve. When the pressure of the hydraulic oil exceeds the threshold value, the safety valve opens, the normally open valve seals the sealing chamber and the pressure stabilizing chamber, and the normally closed valve opens the pressure relief pipe, causing the flow direction of the hydraulic oil inside the overflow valve body to change to enter from the oil inlet, flow through the sealing chamber, the pressure relief chamber, the pressure stabilizing chamber, and then flow through the pressure relief pipe to the outside of the overflow valve body, completing the overflow and pressure stabilization of the overflow valve body, improving the stability and safety of the device, and reducing the situation that the device malfunctions due to excessive hydraulic oil pressure inside the overflow valve body. During the process of the hydraulic oil flowing from the pressure relief chamber to the pressure stabilizing chamber, the hydraulic oil pushes the damping block, causing the damping block to move and contact the cleaning rod, and the cleaning rod cleans the pressure relief channel inside the damping block, facilitating the overflow valve body to resume normal operation and extending the service life of the device.

[0004] However, the following problems still exist in this solution. Only when the pressure of the hydraulic oil inside the overflow valve exceeds the threshold value and the valve body cannot be opened normally, the cleaning rod can clean the pressure relief channel inside the damping block. When the device can be normally enabled, the damping block cannot be cleaned, which leads to the inability to clean the impurities inside the damping block in the use of the device. When there are impurities in the damping block, although it will not directly affect the startup of the device, the impurities will partially block the damping block, increasing the resistance of the oil flow through the damping block. This will cause the pressure in the upper chamber of the main valve core to be affected. Even if the system pressure does not reach the normal set value, the main valve core may open for overflow in advance, or it may not open accurately after reaching the set value, resulting in the actual system pressure deviating from the set pressure, affecting the pressure regulation accuracy, and the flow of the oil in the damping block is affected, easily causing delays in the opening and closing of the overflow valve, resulting in the overflow valve being unable to respond promptly to the increase in system pressure, and affecting the rapid recovery and stability of the system pressure. Summary of the Invention

[0005] The present invention provides a buffer overflow valve, aiming to solve the problem that impurities in the damping block cannot be cleaned in time in the related art.

[0006] The buffer overflow valve of the present invention includes a main valve body and a pilot valve body connected thereto. A circular cavity is formed inside the main valve body for the flow of hydraulic oil. A cylinder body is arranged inside the circular cavity to block the circular cavity and can slide and rotate in the circular cavity under the action of oil pressure. A damping hole coaxial with the circular cavity is formed inside the cylinder body to generate resistance to the hydraulic oil flowing in the circular cavity, so as to generate a pressure difference between the upper and lower spaces of the cylinder body. An installation shaft and a wing plate are arranged inside the damping hole. The wing plate is fixedly installed on the installation shaft, and its outer side is closely attached to the inner wall of the damping hole. The installation shaft vertically penetrates the damping hole and can move circumferentially in the damping hole as the cylinder body rotates, so that the wing plate moves along the inner wall of the damping hole to clean the damping hole. A scraping plate is slidably assembled on the installation shaft along its length direction, and the scraping plate is closely attached to the inner side of the wing plate and can slide along the installation shaft when the wing plate moves to clean the inner side of the wing plate.

[0007] Preferably, an overflow cavity communicating with the circular cavity is formed inside the main valve body, and the overflow cavity is located outside the cylinder body. An oil inlet hole and an oil outlet hole are formed inside the main valve body. The oil inlet hole is located below the overflow cavity and communicates with the circular cavity, and the oil outlet hole communicates with the overflow cavity. A return groove is arranged between the main valve body and the pilot valve body, and the bottom end of the return groove communicates with the overflow cavity.

[0008] Preferably, a pressure regulating cavity and a voltage stabilizing cavity are horizontally formed inside the pilot valve body. The pressure regulating cavity communicates with the top end of the return groove. A partition table is arranged between the pressure regulating cavity and the voltage stabilizing cavity, and a through hole is horizontally formed inside the partition table.

[0009] Preferably, a convex platform extending into the circular cavity is fixedly installed on the pilot valve body, and a communication groove is formed inside the convex platform. An L-shaped upper support rod is arranged at the bottom of the convex platform, and the bottom end of the upper support rod is fixed to the top end of the installation shaft. A sealing plug is arranged at the bottom end of the circular cavity, and an L-shaped lower support rod is rotatably connected to the sealing plug, and the top end of the lower support rod is fixed to the bottom end of the installation shaft.

[0010] Preferably, a transmission gear is rotatably connected to the bottom of the convex platform. A clamping groove is formed at the bottom of the transmission gear. A plug rod inserted into the clamping groove is arranged at the top end of the upper support rod. A gear column meshing with the transmission gear is also rotatably assembled at the bottom of the convex platform. A cavity communicating with the damping hole is formed inside the cylinder body, and a transmission gear ring meshing with the gear column is fixedly installed inside the cavity.

[0011] Preferably, a slide groove is provided on the side wall of the mounting shaft along its length direction, the scraper is slidably assembled inside the slide groove, a turntable is fixedly installed on the bottom end of the lower support rod, a guide ring located on one side of the turntable is fixedly installed on the sealing plug, a traction rope is fixedly connected to the bottom of the scraper, the bottom end of the traction rope passes through the guide ring and is fixedly connected to the turntable, an elastic rope is fixedly connected to the top of the scraper, and the top end of the elastic rope is fixedly connected to the upper support rod.

[0012] Preferably, a first spring is fixedly mounted on the cylinder, a support ring is fixedly mounted on the top end of the first spring, and the support ring is rotatably connected to the outside of the boss.

[0013] Preferably, a spiral groove located above the overflow cavity is formed inside the circular cavity, and a guide block slidably assembled in the spiral groove is fixedly mounted on the outer wall of the cylinder.

[0014] Preferably, a cone is provided inside the pressure regulating chamber, and the cone end of the cone is inserted into the through hole, a pressure regulating spring is fixedly installed on the end of the cone away from the through hole, a support plate is fixedly connected to the end of the pressure regulating spring away from the cone, and the support plate is slidably assembled in the pressure regulating chamber.

[0015] Preferably, a mounting seat is fixedly installed on the side wall of the pilot valve body, a threaded barrel is fixedly installed inside the mounting seat, a pressure regulating handle is threadedly connected to the threaded barrel, a push rod is rotatably connected to the inside of the pressure regulating handle, and the end of the push rod away from the pressure regulating handle is rotatably assembled on the support plate.

[0016] 1. When the present invention is in use, when the oil pressure pushes the cylinder to move or the first spring pushes the cylinder to move, the wing plate can automatically scrape and clean the impurities on the damping hole, so that the impurities fall off from the inner wall of the damping hole and are discharged along with the oil, effectively avoiding the impurities from being retained in the damping hole and blocking the flow of the oil, so that the overflow valve will clean the damping hole once when starting and closing, ensuring that the oil can flow well in the damping hole, so that the equipment maintains a good response speed, and ensures the accuracy of the pressure regulation of the equipment, thereby ensuring the stability and reliability of the entire pressure system.

[0017] 2. When the present invention is in use, while the wing plate is scraping off impurities, the scraper can move to clean the impurities remaining on the wing plate, so that the impurities are completely separated from the damping hole, further reducing the possibility of impurities being retained in the damping hole and improving the use effect of the equipment.

[0018] 3. When the present invention is in use, the sealing plug is removed to disengage the plug rod of the upper support rod from the slot, and the cleaning mechanism and the traction mechanism can be quickly taken out for easy maintenance and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the present invention.

[0020] Figure 2 is the enlarged structural schematic diagram of part A in the present invention Figure 1 in the present invention

[0021] Figure 3 is the enlarged structural schematic diagram of part B in the present invention Figure 1 in the present invention

[0022] Figure 4 is the cross-sectional view of the main valve body of the present invention

[0023] Figure 5 is the three-dimensional view of the main spool valve of the present invention

[0024] Figure 6 is the three-dimensional view of the cylinder body and the transmission mechanism of the present invention

[0025] Figure 7 is the three-dimensional view of the cleaning mechanism of the present invention

[0026] Figure 8 is the enlarged structural schematic diagram of part C in the present invention Figure 7 in the present invention

[0027] Figure 9 is the bottom structural schematic diagram of the transmission gear of the present invention

[0028] Figure 10 is the three-dimensional view of the cone body of the present invention

[0029] Reference numerals: 10. Main valve body; 11. Circular cavity; 12. Overflow cavity; 13. Oil inlet hole; 14. Oil outlet hole; 15. Return groove; 16. Sealing plug; 20. Pilot valve body; 21. Pressure regulating cavity; 22. Voltage stabilizing cavity; 23. Partition platform; 24. Through hole; 25. Boss; 26. Connecting groove; 30. Main spool valve; 31. Cylinder body; 311. Damping hole; 312. Cavity; 313. Annular platform; 32. Support ring; 33. First spring; 40. Pilot spool valve; 41. Cone body; 411. Notch; 42. Support plate; 43. Pressure regulating spring; 50. Pressure regulating assembly; 51. Mounting seat; 52. Threaded barrel; 53. Pressure regulating handle; 54. Push rod; 60. Guide mechanism; 61. Spiral groove; 62. Guide block; 70. Cleaning mechanism; 71. Mounting shaft; 711. Slide groove; 712. Scraper; 72. Wing plate; 73. Upper support rod; 731. Insertion rod; 74. Lower support rod; 80. Traction mechanism; 81. Turntable; 82. Guide ring; 83. Traction rope; 84. Elastic rope; 90. Transmission mechanism; 91. Transmission gear; 911. Card slot; 92. Gear column; 93. Transmission gear ring Detailed implementation manners

[0030] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0031] As Figures 1 to 10 shown, the buffer overflow valve of the present invention includes a main valve body 10, a pilot valve body 20, a main spool 30, a pilot spool 40, a pressure regulating assembly 50, a guiding mechanism 60, a cleaning mechanism 70, a traction mechanism 80, and a transmission mechanism 90. The pilot valve body 20 is arranged on the main valve body 10. The main spool 30 and the pilot spool 40 are arranged inside the main valve body 10 and the pilot valve body 20. Cooperating with the main valve body 10 and the pilot valve body 20 for oil overflow, the pressure of the equipment can be regulated by adjusting the pilot spool 40 with the pressure regulating assembly 50. The guiding mechanism 60 is arranged on the main spool 30 and can make it rotate during the movement of the main spool 30. Then, the cleaning mechanism 70 and the traction mechanism 80 are driven by the transmission mechanism 90 to operate, and the main spool 30 is cleaned to ensure good circulation of the oil.

[0032] Referring Figure 1 to Figure 4 , a circular cavity 11 and an overflow cavity 12 are formed inside the main valve body 10. The overflow cavity 12 is communicated with the circular cavity 11 and the cross-sectional area of the overflow cavity 12 is larger than that of the circular cavity 11. An oil inlet hole 13 and an oil outlet hole 14 are also formed inside the main valve body 10. The oil inlet hole 13 is located below the overflow cavity 12 and is communicated with the circular cavity 11 so that the oil can enter the inside of the circular cavity 11. The oil outlet hole 14 is communicated with the overflow cavity 12 so that the oil can be discharged after entering the overflow cavity 12. A return groove 15 is arranged between the main valve body 10 and the pilot valve body 20, and the bottom end of the return groove 15 is communicated with the overflow cavity 12, so that the oil can enter the overflow cavity 12 through the return groove 15 after passing through the pilot valve body 20. A sealing plug 16 is arranged at the bottom end of the circular cavity 11 for plugging the bottom end of the circular cavity 11.

[0033] Referring Figure 1 , a pressure regulating cavity 21 and a voltage stabilizing cavity 22 are transversely formed inside the pilot valve body 20. A partition platform 23 is arranged between the pressure regulating cavity 21 and the voltage stabilizing cavity 22, and a through hole 24 is transversely formed inside the partition platform 23 to communicate the pressure regulating cavity 21 and the voltage stabilizing cavity 22. The oil in the voltage stabilizing cavity 22 can enter the inside of the pressure regulating cavity 21 through the through hole 24. The pressure regulating cavity 21 is communicated with the top end of the return groove 15. A boss 25 extending into the inside of the circular cavity 11 is fixedly installed on the pilot valve body 20, and a communication groove 26 is formed inside the boss 25 to communicate the circular cavity 11 and the voltage stabilizing cavity 22, so that the oil in the circular cavity 11 can pass through the communication groove 26.

[0034] Referring Figure 1 , Figure 5 andFigure 6 , the main spool 30 includes a cylinder body 31, a support ring 32 and a first spring 33. The cylinder body 31 is arranged inside the circular cavity 11 and can slide and rotate within the circular cavity 11 to close the overflow cavity 12 and block the connection between the overflow cavity 12 and the circular cavity 11. The support ring 32 is rotatably connected to the outside of the boss 25. The first spring 33 is fixedly installed between the cylinder body 31 and the support ring 32 to elastically support the cylinder body 31, enabling the cylinder body 31 to slide within the circular cavity 11 under the push of oil pressure, compress the first spring 33, release the closure of the overflow cavity 12, and allow the circular cavity 11 and the overflow cavity 12 to communicate for oil overflow. After the cylinder body 31 loses the thrust of oil pressure, the first spring 33 pushes the cylinder body 31 to slide back to its original position.

[0035] A damping hole 311 and a cavity 312 are coaxially formed inside the cylinder body 31, and the damping hole 311 communicates with the cavity 312, so that the oil entering the circular cavity 11 can pass through the damping hole 311 and the cavity 312 inside the cylinder body 31. During the oil delivery process, a pressure difference can be generated between the front and rear sides of the cylinder body 31 when passing through the damping hole 311, and then the cylinder body 31 can be pushed to move within the circular cavity 11 by the oil pressure and compress the first spring 33. An annular platform 313 is provided at the bottom end of the cylinder body 31, and the annular platform 313 is fixedly installed inside the circular cavity 11 below the overflow cavity 12 to block and support the cylinder body 31, so that the first spring 33 remains in a compressed state and exerts a downward force on the cylinder body 31.

[0036] Reference Figure 1 And Figure 10 , the pilot spool 40 includes a cone body 41, a support plate 42 and a pressure regulating spring 43. The cone body 41 is arranged inside the pressure regulating cavity 21, and the tapered end of the cone body 41 is inserted into the through hole 24 to block the through hole 24. The support plate 42 is slidably assembled inside the pressure regulating cavity 21. The pressure regulating spring 43 is fixedly installed between the cone body 41 and the support plate 42 to apply a thrust to the cone body 41 in the direction of the through hole 24. A plurality of notches 411 are formed on the cone body 41, facilitating the flow of oil through the cone body 41 and into the pressure regulating cavity 21 after passing through the through hole 24.

[0037] Reference Figure 1 , the pressure regulating assembly 50 includes a mounting seat 51, a threaded cylinder 52, a pressure regulating handle 53 and a push rod 54. The mounting seat 51 is fixedly installed on the side wall of the pilot valve body 20. The threaded cylinder 52 is fixedly installed inside the mounting seat 51. The pressure regulating handle 53 is threadedly connected to the outside of the threaded cylinder 52. The push rod 54 is slidably assembled inside the threaded cylinder 52, and both ends of the push rod 54 are respectively rotatably connected to the pressure regulating handle 53 and the support plate 42, so that when the pressure regulating handle 53 moves outside the threaded cylinder 52, the push rod 54 pushes the support plate 42 to move, adjusting the pressure of the pressure regulating spring 43.

[0038] Reference Figure 1 、 Figure 4 and Figure 5 As shown in FIGS.

[0039] Reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 7 and Figure 8 The cleaning mechanism 70 includes a mounting shaft 71, wing plates 72, upper support rods 73 and lower support rods 74. The mounting shaft 71 is vertically arranged inside the circular cavity 11 and penetrates through the inside of the damping hole 311 vertically. The wing plates 72 are arc-shaped plates fixedly installed on the mounting shaft 71, and the outer side surfaces of the wing plates 72 (the side close to the inner wall of the damping hole 311) are closely attached to the inner wall of the damping hole 311. Both the upper support rod 73 and the lower support rod 74 are L-shaped rods composed of a horizontal part and a vertical part. The horizontal parts of the upper support rod 73 and the lower support rod 74 are respectively fixedly connected to the upper and lower ends of the mounting shaft 71. The vertical parts of the upper support rod 73 and the lower support rod 74 are coaxial with the circular cavity 11 and can rotate inside the circular cavity 11 to drive the mounting shaft 71 to rotate. The wing plates 72 scrape off the impurities adhering to the inner wall of the damping hole 311, so that the impurities fall off from the inner wall of the damping hole 311 and are discharged from the damping hole 311 along with the oil fluid, avoiding the retention of impurities in the damping hole 311 and affecting the flow of the oil fluid. The vertical part of the upper support rod 73 is arranged at the bottom of the boss 25, and the vertical part of the lower support rod 74 is rotatably assembled in the sealing plug 16.

[0040] A chute 711 is formed on the side wall of the mounting shaft 71 along its length direction. A scraper 712 is slidably assembled in the chute 711. The two ends of the scraper 712 extend to the side of the wing plate 72 and are closely attached to the inner side surface of the wing plate 72 (the side far from the inner wall of the damping hole 311). After the wing plate 72 cleans the inner wall of the damping hole 311, the scraper 712 slides along the chute 711 to scrape and clean some of the impurities adhering to the inner side of the wing plate 72 during the cleaning of the damping hole 311, further avoiding the retention of impurities inside the damping hole 311 and ensuring the flow effect of the oil fluid in the damping hole 311.

[0041] Reference Figure 2 、 Figure 3 、 Figure 6 、 Figure 7 and Figure 8, the traction mechanism 80 includes a turntable 81, a guide ring 82, a traction rope 83, and an elastic rope 84. The turntable 81 is fixedly installed on the vertical portion of the lower support rod 74. The guide ring 82 is located on one side of the turntable 81 and is fixedly installed on the sealing plug 16. The top end of the traction rope 83 is fixedly connected to the bottom of the scraper 712, and the bottom end of the traction rope 83 passes through the guide ring 82 and is fixed on the turntable 81. When the turntable 81 rotates following the lower support rod 74, it can wind up the traction rope 83, and then pull the scraper 712 to slide downward along the chute 711 to clean the wing plate 72. The bottom end of the elastic rope 84 is fixedly connected to the top of the scraper 712, and the top end of the elastic rope 84 is fixedly connected to the upper support rod 73. When the wing plate 72 descends, it pulls the elastic rope 84 to stretch. When the turntable 81 flips to release the traction rope 83, the elastic rope 84 can reset and contract to pull the wing plate 72 to slide upward, cleaning the wing plate 72 again. Scraper rings are provided on both the mounting shaft 71 and the lower support rod 74. The elastic rope 84 and the traction rope 83 respectively pass through the two scraper rings, and when the elastic rope 84 and the traction rope 83 are retracted and released, the scraper rings can scrape and clean the impurities adhering to the elastic rope 84 and the traction rope 83.

[0042] Reference Figure 6 , the transmission mechanism 90 includes a transmission gear 91, a gear column 92, and a transmission gear ring 93. The transmission gear 91 and the gear column 92 are both rotatably assembled at the bottom of the boss 25 and mesh with each other. The transmission gear 91 is coaxially arranged with the circular cavity 11, and the top end of the vertical portion of the upper support rod 73 is arranged inside the transmission gear 91. The transmission gear ring 93 is fixedly installed on the inner wall of the cavity 312 and meshes with the gear column 92. When the cylinder body 31 rotates, the transmission gear ring 93 can push the gear column 92 to rotate, and then drive the transmission gear 91 to rotate, causing the upper support rod 73, the mounting shaft 71, and the lower support rod 74 to rotate, and the wing plate 72 cleans the damping holes 311. The height of the gear column 92 is greater than the height of the transmission gear ring 93, so that the transmission gear ring 93 will not disengage from the gear column 92 during up and down movement, and the transmission gear ring 93 always maintains a meshing state with the gear column 92.

[0043] Reference Figure 7 With Figure 9 , a card slot 911 is opened at the bottom of the transmission gear 91. A plug rod 731 adapted to the card slot 911 is fixedly installed on the vertical portion of the upper support rod 73, and the plug rod 731 is inserted into the inside of the card slot 911. Through the insertion between the plug rod 731 and the card slot 911, when the transmission gear 91 rotates, it can drive the upper support rod 73 to rotate. When the upper support rod 73 moves downward, the plug rod 731 can be disengaged from the card slot 911 and separated from the transmission gear 91, so that when the sealing plug 16 is taken out from the bottom end of the circular cavity 11, the cleaning mechanism 70 can be pulled out of the circular cavity 11 for easy maintenance and replacement.

[0044] Working principle: The oil fluid enters the interior of the circular cavity 11 through the oil inlet hole 13, passes through the damping hole 311 of the main spool valve 30, enters the interior of the pressure stabilizing cavity 22 through the communication groove 26, and then the oil fluid enters the through hole 24 to push the conical body 41 of the pilot spool valve 40 to move backward to release the blockage of the through hole 24 and compress the pressure regulating spring 43. The oil fluid enters the return groove 15 through the pressure regulating cavity 21, so that the oil fluid enters the overflow cavity 12 and is discharged through the oil outlet hole 14.

[0045] As the oil fluid is discharged, a pressure difference is formed between the upper and lower sides of the main spool valve 30. The pressure below the main spool valve 30 is greater than the pressure above, so the oil fluid pushes the cylinder body 31 of the main spool valve 30 to move upward in the circular cavity 11 to compress the first spring 33, release the blockage of the cylinder body 31 on the overflow cavity 12, and enable the oil fluid in the circular cavity 11 to directly enter the overflow cavity 12 and then be discharged to complete overflow. The compression amount of the pressure regulating spring 43 is adjusted by the pressure regulating assembly 50 for pressure regulation to keep the equipment in a stable overflow effect.

[0046] While the cylinder body 31 is moving, under the guidance of the spiral groove 61, the guide block 62 causes the moving cylinder body 31 to rotate. The transmission gear ring 93 pushes the gear column 92 to rotate, and then drives the transmission gear 91 to drive the upper support rod 73 to rotate, so that the upper support rod 73 drives the mounting shaft 71, the wing plate 72 and the lower support rod 74 to rotate. The wing plate 72 scrapes and cleans the impurities adhering to the inner wall of the damping hole 311, so that the impurities fall off and then follow the oil fluid to be discharged from the damping hole 311.

[0047] When the wing plate 72 rotates to clean the impurities, the lower support rod 74 drives the turntable 81 to rotate to wind up the traction rope 83, so that the traction rope 83 pulls the scraper 712 to move downward along the chute 711 and stretch the elastic rope 84, scraping and pushing off the impurities adhering to the inner side of the wing plate 72 to the outside of the damping hole 311. When the main spool valve 30 resets and drives the lower support rod 74 to rotate in the reverse direction, the traction rope 83 is released from the turntable 81, and the elastic rope 84 contracts to pull the scraper 712 to move upward, cleaning the inner side of the wing plate 72 again, effectively reducing the residue of impurities in the damping hole 311 and improving the cleaning effect.

[0048] When the present invention is in use, when the cylinder body 31 is pushed to move by hydraulic pressure or the first spring 33, the wing plate 72 can automatically scrape and clean the impurities on the damping hole 311, so that the impurities fall off from the inner wall of the damping hole 311 and are discharged along with the oil. While the wing plate 72 scrapes the impurities, the scraper 712 can move to clean the impurities remaining on the wing plate 72, so that the impurities are completely separated from the damping hole 311, effectively avoiding the retention of impurities in the damping hole 311 and blocking the flow of oil. When the overflow valve starts and closes, the damping hole 311 will be cleaned once, ensuring that the oil can flow well in the damping hole 311, enabling the device to maintain a good response speed and ensuring the accuracy of the device pressure regulation, thereby ensuring the stability and reliability of the entire pressure system.

[0049] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A buffer overflow valve, comprising a main valve body (10) and a pilot valve body (20) connected thereto, characterized in that, Inside the main valve body (10), a circular cavity (11) is provided for the circulation of hydraulic oil; Inside the circular cavity (11), a cylinder body (31) is arranged to block the circular cavity (11), and it can slide and rotate inside the circular cavity (11) under the action of hydraulic pressure. Inside the cylinder body (31), a damping hole (311) coaxial with the circular cavity (11) is provided to generate resistance to the hydraulic oil flowing in the circular cavity (11), so as to generate a pressure difference between the spaces on the upper and lower sides of the cylinder body (31); Inside the damping hole (311), a mounting shaft (71) and a wing plate (72) are arranged. The wing plate (72) is fixedly installed on the mounting shaft (71), and its outer side is closely attached to the inner wall of the damping hole (311). The mounting shaft (71) vertically penetrates the damping hole (311) and can move circumferentially inside the damping hole (311) as the cylinder body (31) rotates, so that the wing plate (72) moves along the inner wall of the damping hole (311) to clean the damping hole (311); A scraper (712) is slidably assembled on the mounting shaft (71) along its length direction, and the scraper (712) is closely attached to the inner side of the wing plate (72) and can slide along the mounting shaft (71) when the wing plate (72) moves to clean the inner side of the wing plate (72).

2. The buffer overflow valve according to claim 1, characterized in that, Inside the main valve body (10), an overflow cavity (12) connected to the circular cavity (11) is provided, and the overflow cavity (12) is located outside the cylinder body (31). An oil inlet hole (13) and an oil outlet hole (14) are provided inside the main valve body (10). The oil inlet hole (13) is located below the overflow cavity (12) and is connected to the circular cavity (11), and the oil outlet hole (14) is connected to the overflow cavity (12). A return groove (15) is provided between the main valve body (10) and the pilot valve body (20), and the bottom end of the return groove (15) is connected to the overflow cavity (12).

3. The buffer overflow valve according to claim 1, wherein Inside the pilot valve body (20), a pressure regulating cavity (21) and a pressure stabilizing cavity (22) are horizontally provided. The pressure regulating cavity (21) is connected to the top end of the return groove (15). A partition platform (23) is provided between the pressure regulating cavity (21) and the pressure stabilizing cavity (22), and a through hole (24) is horizontally provided inside the partition platform (23).

4. The buffer overflow valve according to claim 1, wherein A boss (25) extending into the inside of the circular cavity (11) is fixedly installed on the pilot valve body (20), and a communication groove (26) is provided inside the boss (25). An L-shaped upper support rod (73) is provided at the bottom of the boss (25), and the bottom end of the upper support rod (73) is fixed to the top end of the mounting shaft (71). A sealing plug (16) is provided at the bottom end of the circular cavity (11), and an L-shaped lower support rod (74) is rotatably connected to the sealing plug (16), and the top end of the lower support rod (74) is fixed to the bottom end of the mounting shaft (71).

5. The buffer overflow valve according to claim 4, characterized in that, A transmission gear (91) is rotatably connected to the bottom of the boss (25). A clamping groove (911) is formed at the bottom of the transmission gear (91). A plug rod (731) inserted into the clamping groove (911) is arranged at the top end of the upper support rod (73). A gear column (92) meshing with the transmission gear (91) is also rotatably assembled at the bottom of the boss (25). A cavity (312) communicating with the damping hole (311) is formed inside the cylinder body (31). A transmission gear ring (93) meshing with the gear column (92) is fixedly installed inside the cavity (312).

6. The buffer overflow valve according to claim 5, characterized in that, A sliding groove (711) is formed along the length direction on the side wall of the installation shaft (71). A scraping plate (712) is slidably assembled inside the sliding groove (711). A rotating disc (81) is fixedly installed at the bottom end of the lower support rod (74). A guiding ring (82) located on one side of the rotating disc (81) is fixedly installed on the sealing plug (16). A traction rope (83) is fixedly connected to the bottom of the scraping plate (712). The bottom end of the traction rope (83) passes through the guiding ring (82) and is fixedly connected inside the rotating disc (81). An elastic rope (84) is fixedly connected to the top of the scraping plate (712). The top end of the elastic rope (84) is fixedly connected to the upper support rod (73).

7. The buffer overflow valve according to claim 6, wherein A first spring (33) is fixedly installed on the cylinder body (31). A support ring (32) is fixedly installed at the top end of the first spring (33), and the support ring (32) is rotatably connected to the outside of the boss (25).

8. The buffer overflow valve according to claim 4, wherein, A spiral groove (61) located above the overflow cavity (12) is formed inside the circular cavity (11). A guiding block (62) slidably assembled inside the spiral groove (61) is fixedly installed on the outer wall of the cylinder body (31).

9. The buffer overflow valve according to claim 3, wherein, A cone body (41) is arranged inside the pressure regulating cavity (21), and the tapered end of the cone body (41) is inserted into the through hole (24). A pressure regulating spring (43) is fixedly installed at the end of the cone body (41) away from the through hole (24). One end of the pressure regulating spring (43) away from the cone body (41) is fixedly connected to a support plate (42), and the support plate (42) is slidably assembled inside the pressure regulating cavity (21).

10. The buffer overflow valve according to claim 9, characterized in that, A mounting seat (51) is fixedly installed on the side wall of the pilot valve body (20). A threaded cylinder (52) is fixedly installed inside the mounting seat (51). A pressure regulating handle (53) is threadedly connected to the threaded cylinder (52). A push rod (54) is rotatably connected inside the pressure regulating handle (53), and one end of the push rod (54) away from the pressure regulating handle (53) is rotatably assembled on the support plate (42).

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