Wear-resistant hydraulic cylinder

Abstract

The application relates to the field of hydraulic executing elements, in particular to a wear-resistant hydraulic cylinder, which comprises a cylinder barrel, a piston block sliding in the cylinder barrel, a piston rod sliding and rotating out of a cap, a mounting hole is formed in the piston block, the piston rod is threadedly connected with the bottom of the mounting hole, two mutually parallel first wear-resistant plate pieces are tightly and slidingly matched with one side of the piston block relative to the piston rod, two mutually parallel second wear-resistant plate pieces are tightly and slidingly matched with the side of the two first wear-resistant plate pieces away from the piston block, a top supporting platform is arranged on the piston rod, the diameter of the top supporting platform gradually decreases along the direction close to the bottom of the mounting hole, the first wear-resistant plate pieces and the second wear-resistant plate pieces are all top supported on the top supporting platform, a top supporting ring is further fixedly sleeved on the piston rod, the top supporting ring is located on the side of the second wear-resistant plate pieces away from the first wear-resistant plate pieces, and a limiting compression spring is top supported between the top supporting ring and the two second wear-resistant plate pieces. The application has the effect of prolonging the service life of the hydraulic cylinder.

Description

Wear-resistant hydraulic cylinder Technical Field

[0001] This application relates to the field of hydraulic actuators, and in particular to a wear-resistant hydraulic cylinder. Background Technology

[0002] Hydraulic cylinders are hydraulic actuators that convert hydraulic energy into mechanical energy and perform linear reciprocating motion (or oscillating motion). Due to their simple structure, reliable operation, and smooth running, they are widely used in the hydraulic systems of various machines.

[0003] Chinese Patent No. CN206802002U discloses a hydraulic cylinder, including a cylindrical cylinder, a cap and a cylinder bottom fixedly connected to the cylinder, a piston rod that slides through the cap, and a piston connected to the piston rod and sliding inside the cylinder.

[0004] Because of the friction between the piston and the inner wall of the cylinder, after prolonged use, gaps will form between the inner wall of the cylinder and the piston due to wear, resulting in a gradual decline in the performance of the hydraulic cylinder and obvious deficiencies. Summary of the Invention

[0005] In order to improve the problem that the performance of hydraulic cylinders gradually declines after prolonged use, this application provides a wear-resistant hydraulic cylinder.

[0006] The wear-resistant hydraulic cylinder provided in this application adopts the following technical solution:

[0007] A wear-resistant hydraulic cylinder includes a cylinder barrel, a piston block sliding within the cylinder barrel, and a piston rod that slides and rotates through a cap. The piston block has a mounting hole, and the piston rod is threaded into the mounting hole. Two parallel first wear-resistant plates are fitted against and slidably engaged on one side of the piston block opposite to the piston rod. Two parallel second wear-resistant plates are fitted against and slidably engaged on the side of the two first wear-resistant plates opposite to the piston block. The first wear-resistant plates are perpendicular to the second wear-resistant plates. A support platform is provided on the piston rod, the diameter of which gradually decreases towards the bottom of the mounting hole. Both the first and second wear-resistant plates abut against the support platform. A support ring is also fixedly fitted onto the piston rod, located on the side of the second wear-resistant plates opposite to the first wear-resistant plates. A limit spring supports the support ring between the support ring and the two second wear-resistant plates.

[0008] By adopting the above technical solution, when the inner wall of the cylinder is worn, the worker manually rotates the piston rod, which moves closer to the inside of the cylinder. This pushes the two first wear-resistant plates and the two second wear-resistant plates away from each other synchronously until the first and second wear-resistant plates are both pressed against the inner wall of the cylinder. In this way, the two first wear-resistant plates and the two second wear-resistant plates, together with the piston block, re-isolate the inner cavity of the cylinder, thereby extending the service life of the hydraulic cylinder.

[0009] Optionally, two sealing slots are provided on opposite sides of the two first wear-resistant plates. The sealing slots on the two first wear-resistant plates are divided into two groups corresponding to each other and the two groups are symmetrically distributed about the axis of the mounting hole. A sealing strip is inserted between the two corresponding sealing slots. A sealing spring supports the sealing strip and the closed end of the sealing slot. The sealing strip is in close contact with the piston block and the second wear-resistant plate.

[0010] By adopting the above technical solution, the sealing strip is inserted into the sealing slot on the first wear-resistant plate, which can guide the relative or opposite movement between the two first wear-resistant plates. In addition, the sealing strip maintains the original isolation function of the piston block by tightly adhering to the piston block and the second wear-resistant plate.

[0011] Optionally, the sealing insert has a guide opening on one side that is close to the second wear-resistant plate, and the second wear-resistant plate is provided with a guide strip that slides with the guide opening, the guide strip being perpendicular to the sealing insert.

[0012] By adopting the above technical solution, the sliding cooperation between the guide strip and the guide opening plays a guiding role in the relative or opposite sliding between the two second wear-resistant plates.

[0013] Optionally, an extension pin is coaxially provided at one end of the piston rod located in the mounting hole. The extension pin slides and rotates through the piston block to the side facing away from the top support ring. An anti-loosening disc is coaxially provided at the other end of the extension pin relative to the piston rod. An annular groove coaxial with the anti-loosening disc is opened on the side of the piston block opposite to the anti-loosening disc. Anti-loosening teeth are densely distributed and closely attached to the outer wall of the annular groove. The anti-loosening teeth are circumferentially inclined relative to the tightening direction of the piston rod. An elastic piece is provided on the anti-loosening disc located in the annular groove and engaging with the anti-loosening teeth.

[0014] By adopting the above technical solution, whenever the performance of the hydraulic cylinder deteriorates and the worker tightens the piston rod, the piston rod will drive the anti-loosening disc to rotate through the extension pin. The anti-loosening disc causes the elastic plate to deform and pass over different anti-loosening teeth. The snap-fit ​​between the elastic plate and the anti-loosening teeth reduces the possibility of the piston rod reversing and becoming loose, which is beneficial to improving the contact effect between the first wear-resistant plate and the second wear-resistant plate and the inner wall of the cylinder.

[0015] Optionally, multiple annular grooves are coaxially formed on the piston block, the diameter of the multiple annular grooves gradually increases along the direction away from the axis of the extension pin, the size of the anti-loosening teeth in the multiple annular grooves gradually increases along the direction away from the axis of the extension pin, and at least one elastic plate is provided on the anti-loosening disc relative to each annular groove.

[0016] By adopting the above technical solution, since the wear degree of the cylinder inner wall may vary each time the worker tightens the piston rod, the piston rod rotation angle may also vary. By setting anti-loosening teeth of different sizes in different annular grooves, a high degree of anti-reverse rotation effect can be achieved for the piston rod after rotation at different angles.

[0017] Optionally, an elastic rubber bushing is provided between the mounting hole and the side wall of the piston rod.

[0018] By adopting the above technical solution, the elastic rubber bushing improves the sealing performance between the mounting hole and the piston block, and reduces the possibility of hydraulic oil flowing back and forth on both sides of the piston block.

[0019] Optionally, the anti-loosening disc is bolted to the extension pin.

[0020] By adopting the above technical solution, the anti-loosening disc and elastic plate, together with the anti-loosening teeth, have an anti-reverse effect on the piston rod, thus ensuring that the piston rod can only rotate in one direction. Through the bolting connection between the anti-loosening disc and the extension pin, workers can separate the anti-loosening disc from the extension pin after replacing the first and second wear-resistant plates, thereby restoring the piston rod to its initial state.

[0021] Optionally, a through groove is formed between the two ends of the extension pin, and the through groove extends to the outer circumferential wall of the extension pin.

[0022] By adopting the above technical solution, when the worker turns the piston rod, the hydraulic oil at the bottom of the mounting hole can flow from the through groove into the cylinder, reducing the possibility that the hydraulic oil will obstruct the worker's manual turning of the piston rod.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. When the inner wall of the cylinder is worn, the worker manually rotates the piston rod, which moves closer to the inside of the cylinder. This pushes the two first wear-resistant plates and two second wear-resistant plates away from each other until the first and second wear-resistant plates are pressed against the inner wall of the cylinder. In this way, the two first wear-resistant plates and two second wear-resistant plates, together with the piston block, re-isolate the inner cavity of the cylinder, thereby extending the service life of the hydraulic cylinder.

[0025] 2. Whenever the performance of the hydraulic cylinder deteriorates and the worker tightens the piston rod, the piston rod will drive the anti-loosening disc to rotate through the extension pin. The anti-loosening disc causes the elastic plate to deform and pass over different anti-loosening teeth. The engagement between the elastic plate and the anti-loosening teeth reduces the possibility of the piston rod reversing and becoming loose, which helps to improve the contact effect between the first and second wear-resistant plates and the inner wall of the cylinder. Attached Figure Description

[0026] Figure 1 is a cross-sectional view of an embodiment of this application.

[0027] Figure 2 is an exploded view of the first wear-resistant plate, the second wear-resistant plate, and the piston rod in an embodiment of this application.

[0028] Figure 3 is a cross-sectional view of the anti-loosening teeth, extension pins, and elastic plates in an embodiment of this application.

[0029] Explanation of reference numerals in the attached drawings: 1. Cylinder barrel; 2. Spare cap; 3. Cylinder bottom; 4. Piston rod; 5. Piston block; 51. Mounting hole; 52. Ring groove; 6. First wear-resistant plate; 61. Sealing slot; 7. Second wear-resistant plate; 8. Top support platform; 9. Top support ring; 10. Limiting spring; 11. Sealing insert; 111. Guide port; 12. Sealing spring; 13. Guide strip; 14. Extension pin; 141. Through groove; 15. Anti-loosening disc; 16. Anti-loosening tooth; 17. Elastic sheet; 18. Elastic rubber bushing. Detailed Implementation

[0030] The present application will be further described in detail below with reference to Figures 1-3.

[0031] This application discloses a wear-resistant hydraulic cylinder.

[0032] Referring to Figure 1, the wear-resistant hydraulic cylinder includes a cylinder barrel 1 with a rectangular cross section and a piston block 5 that slides inside the cylinder barrel 1. One end of the cylinder barrel 1 is integrally formed with a cylinder bottom 3, and the other end is bolted with a spare cap 2. A piston rod 4 that slides and rotates through the spare cap 2 is provided on the piston block 5.

[0033] Referring to Figures 1 and 2, the piston block 5 has a T-shaped mounting hole 51 on one side opposite the piston rod 4. The piston rod 4 is threaded into the mounting hole 51 at the smaller diameter position. A top support surface 8 is integrally formed on the piston rod 4, and the diameter of the top support surface 8 gradually decreases along the direction close to the bottom of the mounting hole 51.

[0034] Referring to Figures 1 and 2, the piston block 5 has two parallel first wear-resistant plates 6 that are in close contact and sliding fit with the piston rod 4 on one side, and two parallel second wear-resistant plates 7 that are in close contact and sliding fit with the side of the two first wear-resistant plates 6 that are in close contact with the piston block 5 on the other side.

[0035] The first wear-resistant plate 6 is perpendicular to the second wear-resistant plate 7. The piston rod 4 is located between the two first wear-resistant plates 6 and between the two second wear-resistant plates 7. Both the first wear-resistant plate 6 and the second wear-resistant plate 7 abut against the top support platform 8.

[0036] Referring to Figures 1 and 2, a top support ring 9 is integrally formed on the piston rod 4 relative to the rod body inside the cylinder 1. The top support ring 9 is located on the side of the second wear-resistant plate 7 facing away from the first wear-resistant plate 6, and a limit spring 10 is provided between the top support ring 9 and the second wear-resistant plate 7.

[0037] Referring to Figures 1 and 2, when the hydraulic cylinder's performance deteriorates due to prolonged use, the worker twists the piston rod 4. Under the action of the piston rod 4 being threadedly connected to the mounting hole 51, the piston rod 4 moves towards the bottom of the mounting hole 51, thereby supporting the platform 8 and pushing the two first wear-resistant plates 6 and the two second wear-resistant plates 7 away from each other synchronously until the first wear-resistant plates 6 and the second wear-resistant plates 7 press against the inner wall of the cylinder.

[0038] Referring to Figures 1 and 2, two sealing slots 61 are opened on opposite sides of the two first wear-resistant plates 6. The sealing slots 61 on the two first wear-resistant plates 6 are divided into two groups corresponding to each other, and the two groups are symmetrically distributed about the axis of the mounting hole 51.

[0039] A sealing strip 11 is inserted between two corresponding sealing slots 61. A sealing spring 12 supports the sealing strip 11 and the closed end of the corresponding sealing slot 61. The sealing strip 11 is in close contact with the piston block 5 and the second wear-resistant plate 7.

[0040] The sealing strip 11 engages with the sealing slot 61, guiding the opposing and relative movements between the two first wear-resistant plates 6. Furthermore, the tight contact between the sealing strip 11, the piston block 5, and the second wear-resistant plate 7 restores the isolation function of the first wear-resistant plate 6 and the second wear-resistant plate 7 within the cylinder 1, in conjunction with the piston block 5.

[0041] Referring to Figures 1 and 2, the sealing strip 11 has a guide opening 111 on one side that is close to the second wear-resistant plate 7. The second wear-resistant plate 7 has an integrally formed guide strip 13 that slides with the guide opening 111. The guide strip 13 is perpendicular to the sealing strip 11. The sliding fit between the guide strip 13 and the guide opening 111 guides the relative and opposite movements between the two second wear-resistant plates 7.

[0042] Referring to Figures 1, 2 and 3, since the piston rod 4 is threadedly connected to the mounting hole 51, and collisions are inevitable during the operation of the piston rod 4, the piston rod 4 may become loose due to the collision and reverse rotation. This will create gaps between the first wear-resistant plate 6 and the second wear-resistant plate 7 and the inner wall of the cylinder 1, thus reducing the performance of the hydraulic cylinder.

[0043] For this purpose, an extension pin 14 is coaxially welded to one end of the piston rod 4 located in the mounting hole 51. The extension pin 14 slides and rotates through to the side of the piston block 5 facing away from the top support ring 9. An anti-loosening disc 15 is coaxially bolted to the other end of the extension pin 14 relative to the piston rod 4.

[0044] Referring to Figures 1, 2 and 3, the piston block 5 has an annular groove 52 coaxial with the anti-loosening disc 15 on one side relative to the anti-loosening disc 15. The outer wall of the annular groove 52 is densely covered with anti-loosening teeth 16 in the circumferential direction and closely attached to it. The anti-loosening teeth 16 are circumferentially inclined relative to the tightening direction of the piston rod 4. An elastic piece 17 located in the annular groove 52 and engaged with the anti-loosening teeth 16 is bolted to the anti-loosening disc 15.

[0045] Referring to Figures 1, 2, and 3, during the process of the worker turning the piston rod 4, the piston rod 4 drives the elastic plate 17 to rotate via the extension pin 14 and the anti-loosening disc 15. Each time the elastic plate 17 passes an anti-loosening tooth 16, the elastic plate 17 will deform once. When the worker stops turning the piston rod 4, the elastic plate 17 can engage with the anti-loosening tooth 16 at its current position.

[0046] The snap-fit ​​between the elastic plate 17 and the anti-loosening tooth 16 ensures that the piston rod 4 can only be tightened in the forward direction and cannot be loosened in the reverse direction. Therefore, the piston rod 4 will not loosen due to vibration, ensuring that the high performance of the hydraulic cylinder can be maintained for a long time.

[0047] Referring to Figures 1, 2, and 3, the different wear levels on the inner wall of cylinder 1 each time result in different rotation angles of piston rod 4, which means that piston rod 4 may have a certain amount of reverse rotation margin.

[0048] For this purpose, multiple annular grooves 52 are coaxially formed on the same side of the piston block 5. The diameter of the multiple annular grooves 52 gradually increases in the direction away from the axis of the extension pin 14. The size of the anti-loosening teeth 16 in the multiple annular grooves 52 gradually increases in the direction away from the axis of the extension pin 14. Two elastic plates 17 are bolted to the anti-loosening disc 15 relative to each annular groove 52. The two elastic plates 17 corresponding to the same annular groove 52 are symmetrically distributed about the axis of the extension pin 14.

[0049] Referring to Figures 1, 2, and 3, the arrangement of the multiple annular grooves 52 and the anti-loosening teeth 16 of different sizes makes the angle required to rotate the piston rod 4 past a single anti-loosening tooth 16 gradually increase along the direction away from the axis of the extension pin 14, thereby providing a high anti-reverse function for the piston rod 4 after being turned at different angles.

[0050] Referring to Figures 1, 2, and 3, the anti-loosening disc 15 is bolted to the extension pin 14. After the worker replaces the first wear-resistant plate 6 and the second wear-resistant plate 7, the anti-loosening disc 15 and the extension pin 14 can be separated, thereby allowing the piston rod 4 to return to its initial state.

[0051] Referring to Figures 1, 2 and 3, a through groove 141 is opened between the two ends of the extension pin 14. The through groove 141 extends to the outer circumferential wall of the extension pin 14. The through groove 141 allows the piston rod 4 to push the hydraulic oil at the smaller position of the mounting hole 51 into the cylinder 1 when the worker tightens the piston rod 4, reducing the possibility that the hydraulic oil cannot be discharged from the mounting hole 51 and thus hinders the worker from tightening the piston rod 4.

[0052] Referring to Figure 1, an elastic rubber bushing 18 is provided between the mounting hole 51 with a larger diameter and the side wall of the piston rod 4. The elastic rubber bushing 18 improves the sealing performance between the mounting hole 51 and the piston block 5, and reduces the possibility of hydraulic oil flowing back and forth on both sides of the piston block 5.

[0053] The implementation principle of a wear-resistant hydraulic cylinder in this application embodiment is as follows:

[0054] When the hydraulic cylinder's performance deteriorates due to prolonged use, the worker twists the piston rod 4. Under the action of the piston rod 4's threaded connection with the mounting hole 51, the piston rod 4 moves towards the bottom of the mounting hole 51. This pushes the platform 8 to push the two first wear-resistant plates 6 and the two second wear-resistant plates 7 away from each other synchronously until the first wear-resistant plates 6 and the second wear-resistant plates 7 press against the inner wall of the cylinder. Through the tight contact between the sealing strip 11, the piston block 5, and the second wear-resistant plates 7, the first wear-resistant plates 6 and the second wear-resistant plates 7, together with the piston block 5, restore the isolation function of the first wear-resistant plates 6 and the second wear-resistant plates 7 to the inner cavity of the cylinder 1.

[0055] During this process, the piston rod 4 drives the elastic plate 17 to rotate via the extension pin 14 and the anti-loosening disc 15. Each time the elastic plate 17 passes an anti-loosening tooth 16, the elastic plate 17 deforms. When the worker stops turning the piston rod 4, the elastic plate 17 can engage with the anti-loosening tooth 16 at its position, thereby reducing the possibility of the piston rod 4 reversing and loosening due to vibration, which would lead to a decrease in the performance of the hydraulic cylinder.

[0056] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A wear-resistant hydraulic cylinder, comprising a cylinder barrel (1), a piston block (5) sliding within the cylinder barrel (1), and a piston rod (4) sliding and rotating through a cap (2), wherein the piston block (5) has a mounting hole (51), and the piston rod (4) is threadedly connected to the mounting hole (51), characterized in that: The piston block (5) has two parallel first wear-resistant plates (6) that are tightly attached to and slidably fitted on one side of the piston rod (4). The two first wear-resistant plates (6) have two parallel second wear-resistant plates (7) that are tightly attached to and slidably fitted on the side of the piston block (5) facing away from the piston block (5). The first wear-resistant plates (6) are perpendicular to the second wear-resistant plates (7). A top support platform (8) is provided on the piston rod (4). The diameter of the top support platform (8) gradually decreases along the direction close to the bottom of the mounting hole (51). Both the first wear-resistant plates (6) and the second wear-resistant plates (7) abut against the top support platform (8). A top support ring (9) is also provided on the piston rod (4). The top support ring (9) is located on the side of the second wear-resistant plates (7) facing away from the first wear-resistant plates (6). A limit spring abuts between the top support ring (9) and the two second wear-resistant plates (7). 10); Two sealing slots (61) are opened on opposite sides of the two first wear-resistant plates (6). The sealing slots (61) on the two first wear-resistant plates (6) are divided into two groups in pairs and the two groups are symmetrically distributed about the axis of the mounting hole (51). A sealing strip (11) is inserted between the two corresponding sealing slots (61). A sealing spring (12) is supported between the sealing strip (11) and the closed end of the sealing slot (61). The sealing strip (11) is in close contact with the piston block (5) and the sealing strip (11) is in close contact with the second wear-resistant plate (7). A guide opening (111) is opened on the side of the sealing strip (11) that is in close contact with the second wear-resistant plate (7). A guide strip (13) is provided on the second wear-resistant plate (7) that slides with the guide opening (111). The guide strip (13) is perpendicular to the sealing strip (11).

2. The wear-resistant hydraulic cylinder according to claim 1, characterized in that: One end of the piston rod (4) located in the mounting hole (51) is coaxially provided with an extension pin (14). The extension pin (14) slides and rotates through the piston block (5) on the side facing away from the top support ring (9). The other end of the extension pin (14) is coaxially provided with an anti-loosening disc (15). The piston block (5) has an annular groove (52) coaxial with the anti-loosening disc (15) on the side opposite to the anti-loosening disc (15). The outer wall of the annular groove (52) is densely covered with anti-loosening teeth (16) and closely attached to it. The anti-loosening teeth (16) are circumferentially inclined relative to the tightening direction of the piston rod (4). The anti-loosening disc (15) is provided with an elastic piece (17) located in the annular groove (52) and engaging with the anti-loosening teeth (16).

3. The wear-resistant hydraulic cylinder according to claim 2, characterized in that: Multiple annular grooves (52) are coaxially formed on the piston block (5). The diameter of the multiple annular grooves (52) gradually increases along the direction away from the axis of the extension pin (14). The size of the anti-loosening teeth (16) in the multiple annular grooves (52) gradually increases along the direction away from the axis of the extension pin (14). At least one elastic sheet (17) is provided on the anti-loosening disc (15) relative to each annular groove (52).

4. The wear-resistant hydraulic cylinder according to claim 1, characterized in that: An elastic rubber bushing (18) is provided between the mounting hole (51) and the side wall of the piston rod (4).

5. The wear-resistant hydraulic cylinder according to claim 3, characterized in that: The anti-loosening disc (15) is bolted to the extension pin (14).

6. The wear-resistant hydraulic cylinder according to claim 5, characterized in that: A through groove (141) is provided between the two ends of the extension pin (14), and the through groove (141) extends to the outer circumferential wall of the extension pin (14).

Images