Sealing element for hydraulic cylinder

Abstract

The utility model provides a sealing element for a hydraulic cylinder, which relates to the technical field of sealing elements and comprises a rubber ring, a wear-resistant part is arranged on the outer side of the rubber ring, baffle rings are arranged on two sides of the wear-resistant part, a positioning component is arranged on the outer surface of the wear-resistant part, and fastening components are arranged on the outer surfaces of the baffle rings. The positioning assembly comprises a plurality of pushing pieces, one side of each pushing piece is fixedly connected with one side of the baffle ring, a plurality of grooves are formed in the two sides of the wear-resisting part, and the inner walls of the grooves are fixedly connected with bent pieces. The push piece on one side of the baffle ring is inserted into the groove in the outer surface of the wear-resistant part and located between the bent piece and the bottom end of the inner wall of the groove, the protruding position of the push piece is clamped to the rear side of the bent piece through the bent piece, and the mutual position and angle between the baffle ring and the wear-resistant part are further limited. And the convenience when the sealing element is mounted and the stability when the sealing element works are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of seals, in particular to a seal for a hydraulic cylinder. Background Technique

[0002] Hydraulic cylinder seals are crucial components in hydraulic cylinders. Their main function is to prevent the leakage of working media and the entry of foreign objects from the outside into hydraulic components and hydraulic systems as much as possible. The piston seal located at the head of the hydraulic cylinder piston mainly functions to prevent the leakage of hydraulic oil from the piston head and is the main seal inside the hydraulic cylinder.

[0003] The piston seal is mainly composed of two retaining rings, a wear-resistant part, and a main sealing rubber body. When installing, the two retaining rings need to be sleeved on both sides of the wear-resistant part and the main sealing rubber body. Since there is no connection between the retaining rings, the seal, and the main sealing part, the stability of the seal during operation is not high, and there will be a certain deviation in the angles between the components when installing the seal, resulting in difficult installation. Content of the Utility Model

[0004] The purpose of the utility model is to solve the problem that due to the lack of connection between the retaining rings, the seal, and the main sealing part, the stability of the seal during operation is not high, and there will be a certain deviation in the angles between the components when installing the seal, resulting in difficult installation, and to propose a seal for a hydraulic cylinder.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: A seal for a hydraulic cylinder includes a rubber ring. An outer side of the rubber ring is provided with a wear-resistant part. Both sides of the wear-resistant part are provided with retaining rings. An outer surface of the wear-resistant part is provided with a positioning component. An outer surface of the retaining ring is provided with a fastening component. The positioning component can position the angle and relative position between the retaining ring and the wear-resistant part, and the fastening component can assist in fixing the relative positions among the rubber ring, the wear-resistant part, and the retaining ring after the rubber ring is installed.

[0006] The effects achieved by the above components are as follows: When installing the seal, first put the rubber ring on the sealing part of the piston rod, then use a tool to put the wear-resistant part on the outer side of the rubber ring, and then install the two retaining rings on both sides of the wear-resistant part by means of the positioning component. After the retaining rings are installed, install the fastening component on one side of the retaining ring to further limit the angles among the rubber ring, the wear-resistant part, and the retaining ring.

[0007] Preferably, the positioning component includes a plurality of pushing pieces. One side of the plurality of pushing pieces is fixedly connected to one side of the retaining ring. The pushing pieces are circumferentially distributed on one side of the retaining ring. A plurality of grooves are formed on both sides of the wear-resistant member. The grooves are circumferentially distributed on the outer surface of the wear-resistant member. A bent piece is fixedly connected to the inner wall of the groove. A protrusion is provided between the bent piece and one end of the pushing piece. The bent piece is made of polyurethane material.

[0008] The effects achieved by the above components are as follows: By providing the pushing pieces, when installing the seal and sleeving the two retaining rings on the outside of the wear-resistant member, align the side of the two retaining rings with the pushing pieces with the groove positions on the outer surface of the wear-resistant member, and then insert the pushing pieces into the grooves on the outer surface of the wear-resistant member. When the pushing piece enters the groove, the protrusion on the surface will contact one end of the polyurethane bent piece and push the bent piece to bend inward and deform. Subsequently, when the pushing piece continues to move, it will move between the bent piece and the bottom end of the groove inner wall, and then the bent piece will return to its original shape and clamp the protrusion of the pushing piece behind the bent piece, further restricting the relative position and angle between the retaining ring and the wear-resistant member, improving the convenience when installing the seal and the stability when the seal works.

[0009] Preferably, the edge of the end of the pushing piece provided with the protrusion has a smooth outer surface, and the outer surface of the bent piece away from the groove is a smooth outer surface.

[0010] The effects achieved by the above components are as follows: By providing the edge of the end of the pushing piece provided with the protrusion and the outer surface of the bent piece away from the groove as smooth outer surfaces, it is easier for the pushing piece to enter the groove and push the bent piece to deform without getting stuck.

[0011] Preferably, a plurality of inclined blocks are fixedly connected to the outer surface of the retaining ring. One side of the inclined block away from the retaining ring is fixedly connected to one side of the pushing piece.

[0012] The effects achieved by the above components are as follows: By providing the inclined blocks, the connection between the pushing piece and the retaining ring can be strengthened, and as much as possible, the deflection and fracture at the connection between the pushing piece and the retaining ring when the pushing piece is stressed can be avoided, affecting the normal use of the positioning component.

[0013] Preferably, a plurality of auxiliary components are provided on the outer surface of the retaining ring. The auxiliary component includes a slider. One side of the slider is fixedly connected to a pressing block. A plurality of rectangular grooves are formed on the outer surface of the retaining ring. Sliding grooves are formed on both sides of the inner wall of the rectangular groove. Both ends of the slider slide on the inner wall of the sliding groove.

[0014] The effects achieved by the above components are as follows: When it is necessary to remove the retaining ring after the push piece on one side of the retaining ring is stuck at the bent piece inside the groove on the outer surface of the wear-resistant part, the slider can be pushed at the rectangular groove on the outer surface of the retaining ring to slide on the inner wall of the chute, control the extrusion block to move towards the inside of the groove, and make the bent piece deform by extruding the bent piece with the extrusion block. Then, pull the retaining ring on this side to pull out the push piece from the inside of the groove, and pull out each push piece in turn to remove the retaining ring from one side of the wear-resistant part.

[0015] Preferably, the fastening component includes two semi-circular rods. Bent rods are fixedly connected to both ends of the two semi-circular rods. The bent rods are made of polyurethane material. A sector block is fixedly connected to one end of the bent rod. An annular groove is provided on one side of the outer surface of the retaining ring.

[0016] The effects achieved by the above components are as follows: After fixing the two retaining rings on one side of the wear-resistant part, the two semi-circular rods can be pinched on one side of the two retaining rings to make the polyurethane bent rods move closer to each other and deform. Then, the two semi-circular rods are inserted into the annular groove on the outer surface of the retaining ring. After the semi-circular rods are located inside the annular groove, the bent rods will return to their original shape, fixing the semi-circular rods inside the annular groove, and pressing the sector block at one end of the bent rod against the outside of the rubber ring to further limit the angle between the rubber ring, the wear-resistant part and the retaining ring, and improve the stability of the seal during operation.

[0017] Preferably, a plurality of convex strips are fixedly connected to one side of the sector block, and the convex strips are linearly distributed on the outer surface of the sector block.

[0018] The effects achieved by the above components are as follows: When it is necessary to remove the fastening component, the bent rod can be controlled to deform by pinching the convex strips on the outer surfaces of the two sector blocks with the hand. The convex strips can increase the friction force when the hand contacts the outer surface of the sector block, making it more convenient to control the deformation of the bent rod and not easy to slip.

[0019] Compared with the prior art, the advantages and positive effects of the present utility model are as follows:

[0020] In the present utility model, by setting the positioning component, the push piece on one side of the retaining ring is inserted into the groove on the outer surface of the wear-resistant part between the bent piece and the bottom end of the inner wall of the groove, and the raised part of the push piece is stuck at the rear side of the bent piece by the bent piece, further restricting the relative position and angle between the retaining ring and the wear-resistant part, and improving the convenience during the installation of the seal and the stability of the seal during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0022] Figure 2 is a partial cross-sectional three-dimensional structural schematic diagram of the rubber ring of the present utility model;

[0023] Figure 3 For the present utility model Figure 2 is a schematic perspective view of a partially enlarged structure at position A;

[0024] Figure 4 is a schematic perspective view of the structure of the wear-resistant part of the present utility model;

[0025] Figure 5 is a schematic perspective view of the structure of the retaining ring of the present utility model;

[0026] Figure 6 For the present utility model Figure 5 is a schematic perspective view of a partially enlarged structure at position B;

[0027] Figure 7 is a schematic perspective view of the structure of the semi-circular rod of the present utility model.

[0028] Legend: 1, rubber ring; 2, positioning component; 3, fastening component; 4, wear-resistant part; 5, retaining ring; 21, groove; 22, bent piece; 23, pushing piece; 24, inclined block; 25, auxiliary component; 251, rectangular groove; 252, sliding groove; 253, slider; 254, extrusion block; 31, annular groove; 32, semi-circular rod; 33, bent rod; 34, sector block; 35, rib. Detailed implementation manners

[0029] Example 1, as Figure 1-5 shown, a seal for a hydraulic cylinder includes a rubber ring 1. A wear-resistant part 4 is arranged on the outer side of the rubber ring 1. Retaining rings 5 are arranged on both sides of the wear-resistant part 4. A positioning component 2 is arranged on the outer surface of the wear-resistant part 4. A fastening component 3 is arranged on the outer surface of the retaining ring 5. The positioning component 2 can position the angle and relative positions between the retaining ring 5 and the wear-resistant part 4. The fastening component 3 can assist in fixing the relative positions between the rubber ring 1, the wear-resistant part 4 and the retaining ring 5 after the rubber ring 1 is installed. When installing the seal, first put the rubber ring 1 on the sealing part of the piston rod. Then, with the aid of tools, put the wear-resistant part 4 on the outer side of the rubber ring 1. Then, respectively install the two retaining rings 5 on both sides of the wear-resistant part 4 by means of the positioning component. After the retaining rings 5 are installed, install the fastening component 3 on one side of the retaining ring 5 to further limit the angle between the rubber ring 1, the wear-resistant part 4 and the retaining ring 5.

[0030] Refer to Figure 2-6As shown in the figure, in this embodiment: The positioning component 2 includes a number of pushing pieces 23. One side of the number of pushing pieces 23 is fixedly connected to one side of the retaining ring 5. The pushing pieces 23 are circumferentially distributed on one side of the retaining ring 5. A number of grooves 21 are formed on both sides of the wear-resistant member 4. The grooves 21 are circumferentially distributed on the outer surface of the wear-resistant member 4. A bending piece 22 is fixedly connected to the inner wall of the groove 21. There is a protrusion between the bending piece 22 and one end of the pushing piece 23. The bending piece 22 is made of polyurethane material. By providing the pushing piece 23, when installing the seal and sleeving the two retaining rings 5 on the outside of the wear-resistant member 4, align the side of the two retaining rings 5 with the pushing pieces 23 with the position of the grooves 21 on the outer surface of the wear-resistant member 4, and then insert the pushing pieces 23 into the grooves 21 on the outer surface of the wear-resistant member 4. When the pushing piece 23 enters the groove 21, the protrusion on its surface will contact one end of the polyurethane bending piece 22 and push the bending piece 22 to bend inward and deform. Subsequently, when the pushing piece 23 continues to move, it will move between the bending piece 22 and the bottom end of the inner wall of the groove 21. Then the bending piece 22 will return to its original state and clamp the protrusion of the pushing piece 23 behind the bending piece 22, further restricting the relative position and angle between the retaining ring 5 and the wear-resistant member 4, improving the convenience when installing the seal and the stability when the seal works.

[0031] Refer to Figure 2-6 As shown in the figure, in this embodiment: The edge of the end of the pushing piece 23 with the protrusion has a smooth outer surface. The outer surface of the bending piece 22 away from the groove 21 is a smooth outer surface. By providing that the edge of the end of the pushing piece 23 with the protrusion and the outer surface of the bending piece 22 away from the groove 21 are smooth outer surfaces, it is easier for the pushing piece 23 to enter the groove 21 and push the bending piece 22 to deform without getting stuck. A number of inclined blocks 24 are fixedly connected to the outer surface of the retaining ring 5. One side of the inclined block 24 away from the retaining ring 5 is fixedly connected to one side of the pushing piece 23. By providing the inclined blocks 24, the connection between the pushing piece 23 and the retaining ring 5 can be strengthened, and as much as possible, avoid the deflection and fracture at the connection between the pushing piece 23 and the retaining ring 5 when the pushing piece 23 is stressed, which affects the normal use of the positioning component 2.

[0032] Refer to Figure 2-6As shown in the figure, in this embodiment: several auxiliary components 25 are arranged on the outer surface of the retaining ring 5. The auxiliary component 25 includes a slider 253. One side of the slider 253 is fixedly connected with a pressing block 254. Several rectangular grooves 251 are formed on the outer surface of the retaining ring 5. Both sides of the inner wall of the rectangular groove 251 are provided with sliding grooves 252. Both ends of the slider 253 slide on the inner wall of the sliding groove 252. When it is necessary to remove the retaining ring 5 after the pushing piece 23 on one side of the retaining ring 5 is stuck at the bent piece 22 inside the groove 21 on the outer surface of the wear-resistant part 4, the slider 253 can be pushed at the rectangular groove 251 on the outer surface of the retaining ring 5 to slide on the inner wall of the sliding groove 252, controlling the pressing block 254 to move towards the inside of the groove 21. The bent piece 22 is deformed by pressing the bent piece 22 with the pressing block 254. Then, the retaining ring 5 on this side is pulled to pull out the pushing piece 23 from the inside of the groove 21. The pushing pieces 23 are pulled out in sequence to remove the retaining ring 5 from one side of the wear-resistant part 4.

[0033] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 5 as well as Figure 7 As shown in the figure, in this embodiment: the fastening component 3 includes two semi-circular rods 32. Both ends of the two semi-circular rods 32 are fixedly connected with bending rods 33. The bending rods 33 are made of polyurethane material. One end of the bending rod 33 is fixedly connected with a sector block 34. An annular groove 31 is formed on one side of the outer surface of the retaining ring 5. After the two retaining rings 5 are fixed on one side of the wear-resistant part 4, the two semi-circular rods 32 can be pinched on one side of the two retaining rings 5 to make the polyurethane bending rods 33 move closer to the middle and deform. Then, the two semi-circular rods 32 are clamped into the annular groove 31 on the outer surface of the retaining ring 5. After the semi-circular rods 32 are located inside the annular groove 31, the bending rods 33 will return to their original state, fixing the semi-circular rods 32 inside the annular groove 31, and pressing the sector block 34 at one end of the bending rod 33 on the outside of the rubber ring 1 to further limit the angle between the rubber ring 1, the wear-resistant part 4 and the retaining ring 5, improving the stability of the seal during operation. Several convex strips 35 are fixedly connected to one side of the sector block 34. The convex strips 35 are linearly distributed on the outer surface of the sector block 34. When it is necessary to remove the fastening component 3, the bending rod 33 can be controlled to deform by pinching the convex strips 35 on the outer surface of the two sector blocks 34 with the hand. The convex strips 35 can increase the friction force when the hand contacts the outer surface of the sector block 34, making it more convenient and less likely to slip when controlling the bending rod 33 to deform.

[0034] Working principle: When installing a seal at the piston of a hydraulic cylinder, first put the rubber ring 1 on the sealing part of the piston rod. Then, with the help of tools, put the wear-resistant part 4 on the outside of the rubber ring 1. Next, align the side of the two retaining rings 5 with the push piece 23 on both sides of the wear-resistant part 4 with the groove 21 on the outer surface of the wear-resistant part 4. Push the retaining ring 5 to insert the push piece 23 into the groove 21 on the outer surface of the wear-resistant part 4. When the push piece 23 enters the groove 21, the protrusion on its surface will contact one end of the polyurethane bending piece 22 and push the bending piece 22 to bend inward and deform. Then, when the push piece 23 continues to move, it will move between the bending piece 22 and the bottom end of the inner wall of the groove 21. Then, the bending piece 22 will return to its original shape and clamp the protrusion of the push piece 23 behind the bending piece 22, further restricting the relative position and angle between the retaining ring 5 and the wear-resistant part 4. After installing the two retaining rings 5 on both sides of the wear-resistant part 4, pinch the two semi-circular rods 32 on one side of the two retaining rings 5 to make the polyurethane bending rod 33 move closer to the middle and deform. Then, insert the two semi-circular rods 32 into the annular groove 31 on the outer surface of the retaining ring 5. After the semi-circular rods 32 are located inside the annular groove 31, the bending rod 33 will return to its original shape, fix the semi-circular rods 32 inside the annular groove 31, and press the sector block 34 at one end of the bending rod 33 on the outside of the rubber ring 1, further restricting the angle between the rubber ring 1, the wear-resistant part 4, and the retaining ring 5. When it is necessary to remove the retaining ring 5 from the outer surface of the wear-resistant part 4, first pinch the convex strip 35 on the outer surface of the two pressing blocks by hand to control the deformation of the bending rod 33 and remove the semi-circular rods 32. Then, push the slider 253 to slide on the inner wall of the chute 252 at the rectangular groove 251 on the outer surface of the retaining ring 5, control the extrusion block 254 to move into the groove 21, squeeze the bending piece 22 through the extrusion block 254 to make the bending piece 22 deform, and then pull the retaining ring 5 on this side to pull out the push piece 23 from the inside of the groove 21. Pull out each push piece 23 in turn to remove the retaining ring 5 from one side of the wear-resistant part 4.

[0035] The above is only the preferred embodiment of the present invention, and it is not a limitation of the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present invention, any simple modification, equivalent change, and modification made to the above embodiments according to the technical essence of the present invention still belong to the protection scope of the technical solution of the present invention. In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

Claims

1. A seal for a hydraulic cylinder, comprising a rubber ring (1), characterized in that: A wear-resistant part (4) is arranged on the outside of the rubber ring (1), retaining rings (5) are arranged on both sides of the wear-resistant part (4), a positioning component (2) is arranged on the outer surface of the wear-resistant part (4), and a fastening component (3) is arranged on the outer surface of the retaining ring (5), the positioning component (2) can locate the angle and relative position between the retaining ring (5) and the wear-resistant part (4), and the fastening component (3) can assist in fixing the relative position between the rubber ring (1) and the wear-resistant part (4) and the retaining ring (5) after the rubber ring (1) is installed.

2. A seal for a hydraulic cylinder according to claim 1, characterized in that: The positioning assembly (2) comprises a plurality of push pieces (23), one side of each of the push pieces (23) is fixedly connected to one side of the retaining ring (5), the push pieces (23) are circumferentially distributed on one side of the retaining ring (5), a plurality of grooves (21) are provided on both sides of the wear-resistant part (4), the grooves (21) are circumferentially distributed on the outer surface of the wear-resistant part (4), the inner wall of the groove (21) is fixedly connected to a bending piece (22), one end of the bending piece (22) and the push piece (23) is provided with a protrusion, and the bending piece (22) is made of polyurethane material.

3. A seal for a hydraulic cylinder according to claim 2, characterized in that: The edge of one end of the push piece (23) provided with the protrusion is a smooth outer surface, and the outer surface of the bending piece (22) on the side away from the groove (21) is a smooth outer surface.

4. A seal for a hydraulic cylinder according to claim 3, characterized in that: A plurality of inclined blocks (24) are fixedly connected to the outer surface of the retaining ring (5), and a side of the inclined block (24) away from the retaining ring (5) is fixedly connected to a side of the push piece (23).

5. A seal for a hydraulic cylinder according to claim 4, characterized in that: The outer surface of the retaining ring (5) is provided with a plurality of auxiliary components (25) which can facilitate the removal of the push piece (23) from the inside of the groove (21) to release the connection between the retaining ring (5) and the wear-resistant part (4).

6. A seal for a hydraulic cylinder according to claim 5, characterized in that: The auxiliary component (25) comprises a slider (253), one side of which is fixedly connected to an extrusion block (254), the outer surface of the retaining ring (5) is provided with a plurality of rectangular grooves (251), the inner walls of the rectangular grooves (251) are provided with sliding grooves (252), and the two ends of the slider (253) slide on the inner walls of the sliding grooves (252).

7. A seal for a hydraulic cylinder according to claim 1, characterized in that: The fastening assembly (3) comprises two semicircular rods (32), both ends of the two semicircular rods (32) are fixedly connected with curved rods (33), the curved rods (33) are made of polyurethane material, one end of the curved rod (33) is fixedly connected with a fan-shaped block (34), and an annular groove (31) is provided on one side of the outer surface of the retaining ring (5).

8. A seal for a hydraulic cylinder according to claim 7, characterized in that: A plurality of convex strips (35) are fixedly connected to one side of the sector-shaped block (34), and the convex strips (35) are linearly distributed on the outer surface of the sector-shaped block (34).

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