A high-pressure hydraulic cylinder with a combined sealing structure

Abstract

This invention relates to the field of hydraulic cylinder technology, specifically a high-pressure hydraulic cylinder with a combined sealing structure, comprising: a traction groove on the inner side of the cylinder body, a sealing groove on the surface of the traction groove, a fixing groove on the end face of the cylinder body, a traction rod on the surface of a threaded pipe, an installation groove on the surface of the traction rod, a positioning tube on the end face of the threaded pipe, and a fixing nut on the surface of the positioning tube; the beneficial effects are: firstly, the threaded pipe is screwed into the inside of the cylinder body, and then the sealing performance between the threaded pipe and the cylinder body is increased by the cooperation of the sealing strip and the sealing groove; then, the first arc plate and the second arc plate are spliced ​​together and fixed by the installation nut; then, the spliced ​​first arc plate and the second arc plate can be screwed into the threaded groove, so that the scraper on the end face of the first arc plate and the second arc plate can easily contact the piston rod surface, and finally, the scraper can be used to easily clean the particles on the piston rod surface.

Description

Technical Field

[0001] This invention relates to the field of hydraulic cylinder technology, specifically to a high-pressure hydraulic cylinder with a combined sealing structure. Background Technology

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy, performing linear reciprocating motion (or oscillating motion). It has a simple structure and reliable operation. When used to achieve reciprocating motion, it eliminates the need for a speed reduction device and has no transmission backlash, resulting in smooth movement. Therefore, it is widely used in the hydraulic systems of various machines. The output force of a hydraulic cylinder is directly proportional to the effective area of ​​the piston and the pressure difference between its two sides. A hydraulic cylinder basically consists of a cylinder barrel and cylinder head, a piston and piston rod, and sealing devices.

[0003] In actual working conditions, due to the effects of external environmental factors, the surface of the hydraulic rod will inevitably adsorb a certain amount of impurities and dust. When the hydraulic rod reciprocates through the cylinder, these particulate materials are easily deposited on the surface of the seals, resulting in increased resistance to movement of the hydraulic rod, significant local wear, and consequently affecting the sealing effect and smoothness of the cylinder.

[0004] Therefore, this invention proposes a high-pressure hydraulic cylinder with a combined sealing structure to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a high-pressure hydraulic cylinder with a combined sealing structure to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-pressure hydraulic cylinder with a combined sealing structure, comprising: a cylinder body, a piston rod disposed within the cylinder body, a first mounting seat disposed at one end of the cylinder body, a second mounting seat disposed at one end of the piston rod, a traction groove being provided on the inner side of the cylinder body, a sealing groove being provided on the surface of the traction groove, and a fixing groove being provided on the end face of the cylinder body. The threaded pipe has a traction rod on its surface, an installation groove on its surface, a sealing strip inside the installation groove, a positioning tube on its end face, a fixing nut on its surface, and a sealing tube on the inner side of the fixing nut. The first arc-shaped plate has a positioning slot on its side. The second arc-shaped plate has a positioning plate on its side, and both the first and second arc-shaped plates have scrapers on their end faces.

[0007] Preferably, a sealing gasket is provided in the fixing groove. The sealing gasket has an annular plate structure. The inner side of the cylinder body is threaded. The threaded pipe is screwed into the cylinder body. The traction rod and the traction groove are spirally integrated. The traction rod is inserted into the traction groove and fixedly connected to the surface of the threaded pipe.

[0008] Preferably, the sealing strip is fixedly connected in the mounting groove, the sealing strip is inserted into the sealing groove, the surface of the positioning tube is threaded, the fixing nut is screwed onto the positioning tube, a limit spring is provided on the side of the fixing nut, one end of the limit spring is fixedly connected to the side of the fixing nut, and the other end of the limit spring is provided with a positioning plate, the positioning plate having an annular plate structure.

[0009] Preferably, the positioning plate is provided with a sealing plate on its surface. The sealing plate has an annular plate structure, is inserted into the fixing groove, and the sealing tube is fixedly connected to the side of the fixing nut.

[0010] Preferably, a limiting and fixing groove is provided on the end face of the sealing tube, and a rubber plate is provided in the limiting and fixing groove. The rubber plate has an annular plate structure, and an installation thread groove is provided on the end face of the positioning tube.

[0011] Preferably, a sealing ring is provided on the inner annular surface of the positioning tube, and threads are provided on the surfaces of the first arc plate and the second arc plate. After the first arc plate and the second arc plate are spliced ​​together, they are screwed into the installation thread groove.

[0012] Preferably, after the first arc-shaped plate and the second arc-shaped plate are spliced ​​together, an installation nut is screwed onto the surface, and the positioning plate has a square plate structure as a whole, and the positioning plate is inserted into the positioning slot.

[0013] Preferably, the scraper is provided in two sets, and the two sets of scrapers are respectively fixedly connected to the end faces of the first arc plate and the second arc plate. The first arc plate and the second arc plate are spliced ​​together to form a ring structure, and the inner side of the scraper is in contact with the surface of the piston rod.

[0014] Preferably, the first arc-shaped plate and the second arc-shaped plate are integrally formed in an arc-shaped plate structure, and the inner ring surface of the sealing ring is in contact with the piston rod surface.

[0015] Preferably, the positioning tube is fixedly connected to the end face of the threaded tube, and the positioning slot has a square plate-like structure. There are two sets of positioning slots, and the two sets of positioning slots are symmetrically distributed about the inner surface of the first arc-shaped plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention proposes a high-pressure hydraulic cylinder with a combined sealing structure. In use, a threaded pipe is first screwed into the cylinder body. Then, the sealing performance between the threaded pipe and the cylinder body is enhanced by the cooperation of a sealing strip and a sealing groove. Next, a first arc-shaped plate and a second arc-shaped plate are spliced ​​together and fixed with mounting nuts. The spliced ​​first and second arc-shaped plates are then screwed into the threaded groove. The scrapers on the end faces of the first and second arc-shaped plates can easily contact the piston rod surface, allowing for easy cleaning of particles from the piston rod surface and ensuring a good seal between the piston rod and the cylinder body. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a partial cross-sectional view of the device of the present invention; Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 This is a schematic diagram of the threaded pipe structure of the present invention; Figure 5 This is a schematic diagram of the structure of the present invention when the threaded pipe is tilted; Figure 6 This is a partial sectional view of the hydraulic cylinder body of the present invention; Figure 7 for Figure 6 Enlarged structural diagram at point B; Figure 8 This is a cross-sectional view of the device of the present invention; Figure 9 for Figure 8 Enlarged structural diagram at point C; Figure 10 This is a schematic diagram of the first and second arc-shaped plates of the present invention.

[0018] In the diagram: 1. Cylinder body; 2. Piston rod; 3. First mounting seat; 4. Second mounting seat; 5. Traction groove; 6. Sealing groove; 7. Fixing groove; 8. Threaded pipe; 9. Traction rod; 10. Mounting groove; 11. Sealing strip; 12. Fixing nut; 13. Sealing tube; 14. First arc-shaped plate; 15. Positioning slot; 16. Second arc-shaped plate; 17. Positioning plate; 18. Scraper; 19. Sealing gasket; 20. Positioning tube; 21. Limiting spring; 22. Positioning plate; 23. Sealing plate; 24. Limiting fixing groove; 25. Rubber plate; 26. Mounting threaded groove; 27. Mounting nut; 28. Sealing ring. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit 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.

[0020] Example 1: Please refer to Figures 1 to 10This invention provides a technical solution: a high-pressure hydraulic cylinder with a combined sealing structure, comprising: a cylinder body 1, a piston rod 2 disposed inside the cylinder body 1, a first mounting seat 3 disposed at one end of the cylinder body 1, a second mounting seat 4 disposed at one end of the piston rod 2, a traction groove 5 formed on the inner side of the cylinder body 1, a sealing groove 6 formed on the surface of the traction groove 5, and a fixing groove 7 formed on the end face of the cylinder body 1; a threaded pipe 8, a traction rod 9 disposed on the surface of the threaded pipe 8, an installation groove 10 formed on the surface of the traction rod 9, a sealing strip 11 disposed inside the installation groove 10, a positioning tube 20 disposed on the end face of the threaded pipe 8, a fixing nut 12 disposed on the surface of the positioning tube 20, and a sealing tube 13 disposed on the inner side of the fixing nut 12; a first arc-shaped plate 14, a positioning slot 15 formed on the side of the first arc-shaped plate 14; a second arc-shaped plate 16, a positioning plate 17 disposed on the side of the second arc-shaped plate 16, and scrapers 18 disposed on the end faces of both the first arc-shaped plate 14 and the second arc-shaped plate 16; First, the threaded pipe 8 is screwed into the inside of the cylinder body 1. Then, the sealing strip 11 and the sealing groove 6 are used to increase the sealing performance between the threaded pipe 8 and the cylinder body 1. Next, the first arc plate 14 and the second arc plate 16 are spliced ​​together and fixed by the mounting nut 27. Then, the spliced ​​first arc plate 14 and the second arc plate 16 can be screwed into the mounting thread groove 26. The scraper 18 set on the end face of the first arc plate 14 and the second arc plate 16 can easily contact the surface of the piston rod 2. Finally, the scraper 18 can be used to easily clean the particles on the surface of the piston rod 2, thereby ensuring the sealing effect between the piston rod 2 and the cylinder body 1.

[0021] Example 2: Based on Example 1, a scraper 18 is provided to facilitate the removal of impurities from the surface of the piston rod 2. A sealing plate 23 is provided on the surface of the positioning plate 22. The sealing plate 23 has an annular plate structure and is inserted into the fixing groove 7. The sealing tube 13 is fixedly connected to the side of the fixing nut 12. A limiting fixing groove 24 is opened on the end face of the sealing tube 13. A rubber plate 25 is provided in the limiting fixing groove 24. The rubber plate 25 has an annular plate structure. An installation thread groove 26 is opened on the end face of the positioning tube 20. A sealing ring 28 is provided on the inner annular surface of the positioning tube 20. Threads are opened on the surfaces of the first arc plate 14 and the second arc plate 16. After the first arc plate 14 and the second arc plate 16 are spliced ​​together, they are screwed into the installation thread groove 26. In use, the first arc plate 14 and the second arc plate 16 are first spliced ​​together. Then, the spliced ​​first arc plate 14 and the second arc plate 16 can be easily screwed into the mounting threaded groove 26, thereby fixing the first arc plate 14 and the second arc plate 16. Then, when the piston rod 2 is displaced, the contact between the scraper 18 and the surface of the piston rod 2 can easily clean the larger particles of impurities attached to the surface of the piston rod 2, avoiding wear of the larger particles of impurities with the inside of the cylinder body 1, which would affect the sealing effect. The setting of the sealing ring 28 can increase the sealing performance between the positioning tube 20 and the piston rod 2.

[0022] To facilitate the removal of the first arc plate 14 and the second arc plate 16, a positioning plate 17 is provided. After the first arc plate 14 and the second arc plate 16 are spliced ​​together, an installation nut 27 is screwed onto their surfaces. The positioning plate 17 has a square plate-like structure. The positioning plate 17 is inserted into the positioning slot 15. Two sets of scrapers 18 are provided. The two sets of scrapers 18 are respectively fixedly connected to the end faces of the first arc plate 14 and the second arc plate 16. After the first arc plate 14 and the second arc plate 16 are spliced ​​together, they form a ring structure. The inner side of the scraper 18 is in contact with the surface of the piston rod 2. The first arc plate 14 and the second arc plate 16 have an arc plate-like structure. The inner ring surface of the sealing ring 28 is in contact with the surface of the piston rod 2. The positioning tube 20 is fixedly connected to the end face of the threaded tube 8. The positioning slot 15 has a square plate-like structure. Two sets of positioning slots 15 are provided. The two sets of positioning slots 15 are symmetrically distributed about the inner surface of the first arc plate 14. When it is necessary to remove the first arc plate 14 and the second arc plate 16 during use, firstly rotate the spliced ​​first arc plate 14 and the second arc plate 16 so that the first arc plate 14 and the second arc plate 16 are screwed out of the mounting thread groove 26. Then, the mounting nut 27 can be rotated so that the mounting nut 27 is screwed out of the first arc plate 14 and the second arc plate 16. This removes the limiting effect of the mounting nut 27 on the first arc plate 14 and the second arc plate 16, making it easy to separate the first arc plate 14 and the second arc plate 16. The cooperation between the positioning plate 17 and the positioning groove 15 facilitates the splicing of the first arc plate 14 and the second arc plate 16. The positioning plate 17 can be inserted into the positioning groove 15 to prevent the first arc plate 14 and the second arc plate 16 from shifting, thus facilitating the subsequent fixed connection of the first arc plate 14 and the second arc plate 16 using the mounting nut 27.

[0023] Example 3: Based on Example 2, in order to improve the sealing effect of the cylinder body 1, a threaded tube 8 is provided, a sealing gasket 19 is provided in the fixing groove 7, the sealing gasket 19 has an annular plate structure, the inner side of the cylinder body 1 is threaded, the threaded tube 8 is screwed into the cylinder body 1, the traction rod 9 and the traction groove 5 are spiral in shape, the traction rod 9 is inserted into the traction groove 5, the traction rod 9 is fixedly connected to the surface of the threaded tube 8, the sealing strip 11 is fixedly connected to the mounting groove 10, the sealing strip 11 is inserted into the sealing groove 6, the surface of the positioning tube 20 is threaded, the fixing nut 12 is screwed onto the positioning tube 20, the side of the fixing nut 12 is provided with a limit spring 21, one end of the limit spring 21 is fixedly connected to the side of the fixing nut 12, and the other end of the limit spring 21 is provided with a positioning plate 22, the positioning plate 22 has an annular plate structure; When the threaded tube 8 is screwed into the cylinder body 1, the spiral traction rod 9 can be spirally inserted into the traction groove 5. The sealing strip 11 set in the traction rod 9 can then be engaged in the sealing groove 6. The cooperation between the sealing strip 11 and the sealing groove 6 increases the sealing performance between the threaded tube 8 and the cylinder body 1. Then, by rotating the fixing nut 12, the sealing tube 13 is brought into contact with the end face of the cylinder body 1. The rubber plate 25 set in the limiting fixing groove 24 can increase the seal between the sealing tube 13 and the end face of the cylinder body 1. When the fixing nut 12 is rotated, the sealing plate 23 can be easily engaged in the fixing groove 7. Together with the limiting spring 21, the sealing gasket 19 is squeezed. The elastic force of the limiting spring 21 ensures that the sealing plate 23 is always in contact with the surface of the sealing gasket 19, thereby further improving the sealing effect.

[0024] In actual use, firstly, the threaded pipe 8 is screwed into the inside of the cylinder body 1. Then, the sealing strip 11 and the sealing groove 6 are used to increase the sealing performance between the threaded pipe 8 and the cylinder body 1. Next, the first arc plate 14 and the second arc plate 16 are spliced ​​together and fixed with the mounting nut 27. Then, the spliced ​​first arc plate 14 and the second arc plate 16 can be screwed into the threaded groove 26. Thus, the scraper 18 set on the end face of the first arc plate 14 and the second arc plate 16 can easily contact the surface of the piston rod 2. Finally, the scraper 18 can be used to easily clean the particles on the surface of the piston rod 2, thereby ensuring the sealing effect between the piston rod 2 and the cylinder body 1. In addition, when it is necessary to remove the first arc plate 14 and the second arc plate 16, firstly, the spliced ​​first arc plate 14 and the second arc plate 16 are removed. 4. Rotate the second arc plate 16 to screw the first arc plate 14 and the second arc plate 16 out of the mounting threaded groove 26. Then, rotate the mounting nut 27 to screw the mounting nut 27 out of the first arc plate 14 and the second arc plate 16. This removes the limiting effect of the mounting nut 27 on the first arc plate 14 and the second arc plate 16, making it easy to separate the first arc plate 14 and the second arc plate 16. The cooperation between the positioning plate 17 and the positioning groove 15 facilitates the splicing of the first arc plate 14 and the second arc plate 16. The positioning plate 17 can be inserted into the positioning groove 15 to prevent the first arc plate 14 and the second arc plate 16 from shifting. This makes it easy to fix the first arc plate 14 and the second arc plate 16 together using the mounting nut 27.

[0025] 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 high pressure hydraulic cylinder with a combined seal arrangement, comprising: The cylinder body (1) has a piston rod (2) inside it, a first mounting seat (3) is provided at one end of the cylinder body (1), and a second mounting seat (4) is provided at one end of the piston rod (2). The cylinder body (1) has a traction groove (5) on its inner side, a sealing groove (6) on its surface, and a fixing groove (7) on its end face. A threaded pipe (8) is provided with a traction rod (9) on its surface. An installation groove (10) is provided on the surface of the traction rod (9). A sealing strip (11) is provided in the installation groove (10). A positioning tube (20) is provided on the end face of the threaded pipe (8). A fixing nut (12) is provided on the surface of the positioning tube (20). A sealing tube (13) is provided on the inner side of the fixing nut (12). The first arc-shaped plate (14) has a positioning slot (15) on its side. The second arc plate (16) has a positioning plate (17) on its side, and the end faces of the first arc plate (14) and the second arc plate (16) are both provided with scrapers (18). The sealing strip (11) is fixedly connected in the mounting groove (10), and the sealing strip (11) is inserted into the sealing groove (6). The surface of the positioning tube (20) is threaded, and the fixing nut (12) is screwed onto the positioning tube (20). A limit spring (21) is provided on the side of the fixing nut (12). One end of the limit spring (21) is fixedly connected to the side of the fixing nut (12), and the other end of the limit spring (21) is provided with a positioning plate (22). The positioning plate (22) has an annular plate structure. The positioning plate (22) is provided with a sealing plate (23), which has an annular plate structure. The sealing plate (23) is inserted into the fixing groove (7), and the sealing tube (13) is fixedly connected to the side of the fixing nut (12). The end face of the sealing tube (13) is provided with a limiting fixing groove (24), and a rubber plate (25) is provided in the limiting fixing groove (24). The rubber plate (25) has an annular plate structure, and the end face of the positioning tube (20) is provided with an installation thread groove (26).

2. A high-pressure hydraulic cylinder with a combined sealing structure according to claim 1, characterized in that: A sealing gasket (19) is provided in the fixed groove (7). The sealing gasket (19) has an annular plate structure. The inner side of the cylinder body (1) is threaded. The threaded tube (8) is screwed into the cylinder body (1). The traction rod (9) and the traction groove (5) are spiral in shape. The traction rod (9) is inserted into the traction groove (5). The traction rod (9) is fixedly connected to the surface of the threaded tube (8).

3. A high-pressure hydraulic cylinder with a combined sealing structure according to claim 1, characterized in that: The inner ring of the positioning tube (20) is provided with a sealing ring (28). The surfaces of the first arc plate (14) and the second arc plate (16) are both threaded. After the first arc plate (14) and the second arc plate (16) are spliced ​​together, they are screwed into the installation thread groove (26).

4. A high-pressure hydraulic cylinder with a combined sealing structure according to claim 1, characterized in that: After the first arc plate (14) and the second arc plate (16) are spliced ​​together, the surface is screwed with a mounting nut (27). The positioning plate (17) is a square plate structure and is inserted into the positioning slot (15).

5. A high-pressure hydraulic cylinder with a combined sealing structure according to claim 1, characterized in that: The scraper (18) is provided in two sets. The two sets of scrapers (18) are fixedly connected to the end faces of the first arc plate (14) and the second arc plate (16) respectively. The first arc plate (14) and the second arc plate (16) are spliced ​​together to form a ring structure. The inner side of the scraper (18) is in contact with the surface of the piston rod (2).

6. A high-pressure hydraulic cylinder with a combined sealing structure according to claim 1, characterized in that: The first arc plate (14) and the second arc plate (16) are integrally arc plate-shaped structures, and the inner ring surface of the sealing ring (28) is in contact with the surface of the piston rod (2).

7. A high-pressure hydraulic cylinder with a combined sealing structure according to claim 1, characterized in that: The positioning tube (20) is fixedly connected to the end face of the threaded tube (8). The positioning slot (15) has a square plate structure. There are two sets of positioning slots (15). The two sets of positioning slots (15) are symmetrically distributed about the inner surface of the first arc plate (14).

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