A hydraulic cylinder leak-proof seal structure

Abstract

The utility model discloses a kind of leak-proof sealing structure of hydraulic oil cylinder, comprising: cylinder barrel, telescopic rod is equipped in cylinder barrel interior, piston is threadedly connected with telescopic rod one end, and end cover is installed in one end of cylinder barrel;Sealing assembly, sealing assembly is located between end cover and cylinder barrel, and sealing assembly includes: first recess, first sealing ring, third recess, fourth recess, second sealing ring, placing groove and dustproof sealing element, first recess is set in end cover inner side, third recess is set in end cover outer side, first recess and third recess are each equipped with first sealing ring in interior, fourth recess is set in end cover inner side, second sealing ring is equipped in fourth recess interior, placing groove is set in one side of end cover, dustproof sealing element is equipped in placing groove interior.The utility model realizes the setting of sealing assembly, optimizes sealing structure layout, introduces self-tight type sealing mechanism and dustproof function, effectively solves the problems, such as traditional hydraulic oil cylinder is easily leaked, poor pollution resistance and the like.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, specifically to a leak-proof sealing structure for hydraulic cylinders. Background Technology

[0002] A hydraulic cylinder is an actuator that converts the pressure energy of a liquid (usually hydraulic oil) into mechanical energy. It is widely used in various mechanical equipment, such as construction machinery, metallurgical equipment, ships, aviation, and machine tools. It uses liquid pressure to drive a piston rod to perform linear reciprocating motion, thereby achieving the pushing and pulling action on the load.

[0003] Existing hydraulic cylinders typically use a single O-ring or Y-ring for sealing. However, during use, leaks occur at multiple points, such as the gap between the telescopic rod and the end cap, and the mating surface between the end cap and the cylinder. The existing structure is too simple to completely block the leakage path, and the sealing force is unstable when the system pressure fluctuates. At the same time, external dust, moisture and other contaminants can easily enter the cylinder with the reciprocating motion of the telescopic rod, contaminating the hydraulic oil and accelerating the wear of the seals and the inner wall of the cylinder. Utility Model Content

[0004] The technical problem to be solved by this utility model embodiment is to provide a leak-proof sealing structure for hydraulic cylinders. By setting the sealing components, optimizing the sealing structure layout, introducing a self-tightening sealing mechanism and dustproof function, the problem of easy leakage and poor anti-pollution ability of traditional hydraulic cylinders is effectively solved.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a leak-proof sealing structure for a hydraulic cylinder, comprising:

[0006] A cylinder barrel, wherein a telescopic rod is provided inside the cylinder barrel, a piston is threaded to one end of the telescopic rod, and an end cap is installed at one end of the cylinder barrel;

[0007] A sealing assembly is disposed between the end cap and the cylinder to prevent leakage. The sealing assembly includes: a first groove, a first sealing ring, a third groove, a fourth groove, a second sealing ring, a placement groove, and a dustproof seal. The end cap has a first groove on its inner side and a third groove on its outer side. The first and third grooves each have a first sealing ring inside. The end cap has a fourth groove on its inner side, and a second sealing ring inside the fourth groove. The end cap has a placement groove on one side, and a dustproof seal is provided inside the placement groove.

[0008] Furthermore, a first connecting pipe and a second connecting pipe are respectively connected to the outer side of the cylinder. Both the first connecting pipe and the second connecting pipe communicate with the inside of the cylinder. Two limiting rings are installed on the inner wall of the cylinder, and the piston is located between the limiting rings. The cross-sectional size of the piston is adapted to the cross-sectional size of the cylinder. The first connecting pipe and the second connecting pipe are respectively located on the side of the limiting ring away from the piston.

[0009] Furthermore, one end of the cylinder is connected to a mounting flange, and the end cover has holes corresponding to the position of the mounting flange. The end cover is connected to the mounting flange by bolts. The surface of the mounting flange has a first sealing groove, and the side of the end cover facing the cylinder has a second sealing groove. The first sealing groove and the second sealing groove are in corresponding positions, and a sealing ring is provided between the first sealing groove and the second sealing groove.

[0010] Furthermore, the sealing ring is an O-ring, the first sealing ring is a U-ring, and the second sealing ring is a D-ring.

[0011] Furthermore, the inner wall of the end cap is provided with a second groove that communicates with the first groove, and a guide ring is provided inside the second groove, with a sealing gasket provided on one side of the guide ring.

[0012] Furthermore, the dustproof seal has multiple evenly distributed through holes, and a ring-shaped mounting plate is provided on one side of the dustproof seal. The mounting plate has mounting holes corresponding to the positions of the through holes. The end cap has multiple fixing holes communicating with the placement groove on one side, and mounting bolts are provided in the fixing holes.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] By designing the sealing components, multiple sealing structures can be incorporated into the end cap, including a first sealing ring, a second sealing ring, and a sealing ring, to seal the gaps between the end cap and the telescopic rod, and between the end cap and the cylinder. Simultaneously, the first sealing ring has a pressure-self-tightening function; as the hydraulic system pressure increases, its lip automatically tightens outwards under the action of hydraulic oil, thereby enhancing the sealing force and effectively preventing internal leakage under high-pressure conditions. Secondly, the dustproof seal effectively removes external contaminants such as dust, moisture, and mud adhering to the surface of the telescopic rod during its reciprocating motion, preventing impurities from entering the cylinder and maintaining the cleanliness of the hydraulic oil. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a half-sectional view of the overall structure of this utility model.

[0017] Figure 3 This is a cross-sectional view of the overall structure of this utility model.

[0018] Figure 4 This is a schematic diagram of the cylinder structure of this utility model.

[0019] Figure 5 This is a schematic diagram of the dustproof sealing component of this utility model.

[0020] Figure 6 This is a schematic diagram of the second groove structure of this utility model.

[0021] Figure 7 This is a half-sectional view of the end cap structure of this utility model.

[0022] Figure 8 For the present utility model Figure 3 Enlarged view of point A in the image.

[0023] Figure 9 For the present utility model Figure 3 Enlarged view of point B in the image.

[0024] In the diagram: 1. Cylinder; 101. First connecting pipe; 102. Second connecting pipe; 103. Mounting flange; 104. First sealing groove; 2. Telescopic rod; 201. Piston; 3. End cap; 301. Second sealing groove; 302. Sealing ring; 4. First groove; 401. First sealing ring; 402. Guide ring; 403. Sealing gasket; 404. Second groove; 405. Third groove; 406. Fourth groove; 407. Second sealing ring; 5. Placement groove; 501. Dustproof seal; 502. Through hole; 503. Mounting plate; 504. Mounting hole; 505. Mounting bolt; 506. Fixing hole. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] This application provides a leak-proof sealing structure for hydraulic cylinders, which solves the problems of easy leakage and poor anti-pollution ability of traditional hydraulic cylinders.

[0027] By setting the sealing components, multiple sealing structures can be designed on the end cover 3, including a first sealing ring 401, a second sealing ring 407, and a sealing ring 302, to seal the gaps between the end cover 3 and the telescopic rod 2, and between the end cover 3 and the cylinder 1. At the same time, the first sealing ring 401 has a pressure self-tightening function. As the hydraulic system pressure increases, its lip automatically closes outward under the action of hydraulic oil, and the sealing force is enhanced, effectively preventing internal leakage under high pressure conditions. Secondly, by setting the dustproof seal 501, external contaminants such as dust, moisture, and mud adhering to the surface of the telescopic rod 2 can be effectively scraped off during the reciprocating motion, preventing impurities from entering the cylinder 1 and maintaining the cleanliness of the hydraulic oil.

[0028] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0029] Reference Figure 1 , Figure 2 and Figure 3 As shown, a leak-proof sealing structure for a hydraulic cylinder includes: a cylinder barrel 1, with a telescopic rod 2 inside the cylinder barrel 1, a piston 201 threadedly connected to one end of the telescopic rod 2, and an end cap 3 installed at one end of the cylinder barrel 1; and a sealing assembly, which is located between the end cap 3 and the cylinder barrel 1 to prevent leakage. The sealing assembly includes: a first groove 4, a first sealing ring 401, a third groove 405, a fourth groove 406, a second sealing ring 407, a placement groove 5, and a dustproof seal 501. The first groove is formed on the inner side of the end cap 3. 4. A third groove 405 is provided on the outer side of the end cap 3. A first sealing ring 401 is provided inside both the first groove 4 and the third groove 405. A fourth groove 406 is provided on the inner side of the end cap 3. A second sealing ring 407 is provided inside the fourth groove 406. A placement groove 5 is provided on one side of the end cap 3. A dustproof seal 501 is provided inside the placement groove 5. A first connecting pipe 101 and a second connecting pipe 102 are respectively connected to the outer side of the cylinder 1. Both the first connecting pipe 101 and the second connecting pipe 102 communicate with the inside of the cylinder 1.

[0030] In use, it is connected to an external hydraulic pump through the first connecting pipe 101 and the second connecting pipe 102 to provide hydraulic power to the cylinder 1. During the extension and retraction of the telescopic rod 2, the first sealing ring 401 and the second sealing ring 407 in the sealing assembly are used to prevent hydraulic oil from leaking from the gap between the telescopic rod 2 and the end cover 3, and to seal the gap between the end cover 3 and the cylinder 1 to avoid hydraulic oil leakage.

[0031] Furthermore, two limiting rings are installed on the inner wall of the cylinder 1, and the piston 201 is located between the limiting rings. The cross-sectional size of the piston 201 is adapted to the cross-sectional size of the cylinder 1. The first connecting pipe 101 and the second connecting pipe 102 are located on the side of the limiting ring away from the piston 201, respectively.

[0032] When the telescopic rod 2 needs to extend, hydraulic oil can be injected into the cylinder 1 through the first connecting pipe 101, causing the hydraulic oil pressure on one side of the piston 201 to rise, while the hydraulic oil on the other side enters the hydraulic pump through the second connecting pipe 102, causing the piston 201 to push the telescopic rod 2 outward under the action of the pressure difference.

[0033] When the telescopic rod 2 needs to retract, hydraulic oil is injected into the cylinder 1 through the second connecting pipe 102, and the hydraulic oil on the piston 201 side is discharged from the first connecting pipe 101, thus completing the retraction of the telescopic rod 2.

[0034] Reference Figure 2 , Figure 3 and Figure 9 As shown, one end of the cylinder 1 is connected to a mounting flange 103. The end cover 3 has holes corresponding to the position of the mounting flange 103. The end cover 3 is connected to the mounting flange 103 by bolts. The surface of the mounting flange 103 has a first sealing groove 104. The side of the end cover 3 facing the cylinder 1 has a second sealing groove 301. The first sealing groove 104 and the second sealing groove 301 are in corresponding positions. A sealing ring 302 is provided between the first sealing groove 104 and the second sealing groove 301.

[0035] When the end cap 3 is installed on the cylinder 1, the first sealing groove 104 and the second sealing groove 301 are close to each other to form an annular groove that fits the sealing ring 302. The sealing ring 302 is squeezed by the first sealing groove 104 and the second sealing groove 301, causing the sealing ring 302 to undergo elastic deformation, thereby sealing the gap between the end cap 3 and the mounting flange 103 to prevent hydraulic oil leakage inside the cylinder 1.

[0036] Reference Figure 8 and Figure 9 As shown, sealing ring 302 is an O-ring, first sealing ring 401 is a U-ring, and second sealing ring 407 is a D-ring. Through the setting of the first sealing ring 401, during the use of cylinder 1, some hydraulic oil seeps from between end cap 3 and telescopic rod 2 into the first groove 4, or seeps into the third groove 405 through the gap between end cap 3 and cylinder 1. At this time, the hydraulic oil enters the U-shaped cavity on the first sealing ring 401, pushing the lip to expand outward and tightly adhere to the outer surface of the first groove 4 and telescopic rod 2 to form a self-tightening seal. The higher the pressure, the stronger the sealing force.

[0037] Similarly, hydraulic oil enters the U-shaped cavity of the first sealing ring 401 in the third groove 405, thereby sealing the gap between the end cover 3 and the cylinder 1.

[0038] The D-shaped design of the second sealing ring 407 provides better stability and compression resistance, while the flat portion helps maintain the position of the second sealing ring 407 and reduces displacement caused by improper installation or pressure fluctuations. The semi-circular portion provides good elastic recovery force, which helps maintain the sealing contact pressure.

[0039] Reference Figure 5 , Figure 6 and Figure 7 As shown, the inner wall of the end cap 3 is provided with a second groove 404 that communicates with the first groove 4. The second groove 404 is provided with a guide ring 402 inside, and a sealing gasket 403 is provided on one side of the guide ring 402.

[0040] Then, by setting the guide ring 402, it is ensured that the telescopic rod 2 moves smoothly along the predetermined trajectory, avoiding abnormal wear caused by eccentric load, while effectively dispersing the lateral load, reducing the pressure on the sealing structure, and preventing the sealing structure from failing prematurely.

[0041] Reference Figure 7 As shown, the dustproof seal 501 has multiple evenly distributed through holes 502. The dustproof seal 501 has an annular mounting plate 503 on one side. The mounting plate 503 has mounting holes 504 corresponding to the positions of the through holes 502. The end cap 3 has multiple fixing holes 506 communicating with the placement groove 5 on one side. The fixing holes 506 are equipped with mounting bolts 505.

[0042] During installation, the mounting plate 503 and dustproof seal 501 can be sequentially fitted onto the telescopic rod 2. Then, the telescopic rod 2 passes through the end cover 3 and is connected to the piston 201. Next, the piston 201 is inserted into the cylinder 1. Then, the end cover 3 is installed through the mounting flange 103. After the end cover 3 is installed, the dustproof seal 501 can be placed in the placement groove 5, and the through hole 502 is aligned with the fixing hole 506. Then, the mounting plate 503 is moved toward the dustproof seal 501, and the mounting hole 504 is aligned with the through hole 502. Then, the mounting bolt 505 passes through the mounting hole 504 and the through hole 502 and is screwed into the fixing hole 506 to complete the installation of the dustproof seal 501. Through the setting of the dustproof seal 501, the dustproof seal 501 can scrape off dirt, moisture and other impurities attached to the surface of the telescopic rod 2 during use, while providing a certain degree of sealing effect to prevent external contaminants from entering the hydraulic cylinder.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A leak-proof sealing structure for a hydraulic cylinder, characterized in that, include: A cylinder (1) is provided inside the cylinder (1), a telescopic rod (2) is provided inside the cylinder (1), a piston (201) is threaded to one end of the telescopic rod (2), and an end cap (3) is installed at one end of the cylinder (1). A sealing assembly is provided between the end cap (3) and the cylinder (1) to prevent leakage. The sealing assembly includes: a first groove (4), a first sealing ring (401), a third groove (405), a fourth groove (406), a second sealing ring (407), a placement groove (5), and a dustproof seal (501). The end cap (3) has a first groove (4) on its inner side and a third groove (405) on its outer side. The first groove (4) and the third groove (405) are both provided with a first sealing ring (401). The end cap (3) has a fourth groove (406) on its inner side and a second sealing ring (407) inside the fourth groove (406). The end cap (3) has a placement groove (5) on one side and a dustproof seal (501) inside the placement groove (5).

2. The anti-leakage sealing structure for the hydraulic cylinder according to claim 1, characterized in that, The cylinder (1) is connected to a first connecting pipe (101) and a second connecting pipe (102) on its outer side. Both the first connecting pipe (101) and the second connecting pipe (102) are connected to the inside of the cylinder (1).

3. The anti-leakage sealing structure for the hydraulic cylinder according to claim 2, characterized in that, Two limiting rings are installed on the inner wall of the cylinder (1), and the piston (201) is located between the limiting rings. The cross-sectional size of the piston (201) is adapted to the cross-sectional size of the cylinder (1). The first connecting pipe (101) and the second connecting pipe (102) are respectively located on the side of the limiting ring away from the piston (201).

4. The anti-leakage sealing structure for the hydraulic cylinder according to claim 1, characterized in that, One end of the cylinder (1) is connected to a mounting flange (103), and the end cover (3) has holes corresponding to the position of the mounting flange (103). The end cover (3) is connected to the mounting flange (103) by bolts.

5. The anti-leakage sealing structure for the hydraulic cylinder according to claim 4, characterized in that, The mounting flange (103) has a first sealing groove (104) on its surface, and the end cover (3) has a second sealing groove (301) on the side facing the cylinder (1). The first sealing groove (104) and the second sealing groove (301) are in corresponding positions, and a sealing ring (302) is provided between the first sealing groove (104) and the second sealing groove (301).

6. The anti-leakage sealing structure for a hydraulic cylinder according to claim 5, characterized in that, The sealing ring (302) is an O-ring, the first sealing ring (401) is a U-ring, and the second sealing ring (407) is a D-ring.

7. The anti-leakage sealing structure for the hydraulic cylinder according to claim 1, characterized in that, The inner wall of the end cap (3) is provided with a second groove (404) that communicates with the first groove (4). The second groove (404) is provided with a guide ring (402) inside, and a sealing gasket (403) is provided on one side of the guide ring (402).

8. The anti-leakage sealing structure for the hydraulic cylinder according to claim 1, characterized in that, The dustproof seal (501) has a plurality of evenly distributed through holes (502). The dustproof seal (501) has a ring-shaped mounting plate (503) on one side. The mounting plate (503) has mounting holes (504) corresponding to the positions of the through holes (502). The end cap (3) has a plurality of fixing holes (506) communicating with the placement groove (5) on one side. The fixing holes (506) are provided with mounting bolts (505).

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