Combined sealing structure of hydraulic cylinder

Abstract

The utility model discloses a hydraulic cylinder combined sealing structure which comprises a cylinder bottom, a mounting hole is formed in the surface of the cylinder bottom and penetrates through the cylinder bottom, a cylinder barrel is fixedly connected to the top of the cylinder bottom, second clamping blocks are inserted into the two sides of the inner wall of the cylinder barrel, a first sealing ring is attached to the inner wall of the cylinder barrel, and a second sealing ring is attached to the inner wall of the cylinder barrel. The two sides of the outer wall of the first sealing ring are fixedly connected to the outer wall of the second clamping block, and a piston rod is attached to the inner wall of the first sealing ring. According to the combined sealing structure of the hydraulic cylinder, the handle, the connecting disc, the threaded rod and the bent plate are matched, so that the first sealing ring can be quickly and conveniently replaced, and the problems that when a top sealing ring of an existing combined sealing structure of the hydraulic cylinder is replaced, the replacement is troublesome, and the replacement efficiency is high are solved. The speed is slow, so that the sealing ring at the top of the hydraulic cylinder is inconvenient to replace.

Description

Technical Field

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

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has a simple structure and reliable operation. When the hydraulic cylinder is working, a combined seal structure is required to seal the inside of the hydraulic cylinder.

[0003] For example, a combined seal structure of a hydraulic cylinder with the authorization announcement number CN209067581U includes a split piston, a combined seal device arranged on the split piston, a first thin-wall sleeve and a second thin-wall sleeve for adjusting the seal gap in the combined seal device; although the above document can achieve advantages such as good sealing effect and reliability, it can eliminate or reduce the problem of increased leakage caused by increased pressure, and is suitable for occasions with high oil pressure and high requirements for sealing performance;

[0004] However, during use, when the hydraulic cylinder is working, the inside of the hydraulic cylinder is sealed by the sealing ring at the top of the hydraulic cylinder. Since the piston rod rubs against the sealing ring when the piston rod moves, after a long time, the gap between the piston rod and the sealing ring becomes larger, and the sealing ring needs to be replaced. As a result, the replacement is troublesome and slow, making it inconvenient to replace the sealing ring at the top of the hydraulic cylinder. Content of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the utility model provides a solution to the problem that the existing replacement is troublesome and slow, making it inconvenient to replace the sealing ring at the top of the hydraulic cylinder.

[0006] To achieve the above object, the utility model is realized by the following technical solutions: A combined seal structure of a hydraulic cylinder, including a cylinder bottom, on the surface of the cylinder bottom there is an installation hole which penetrates through the cylinder bottom, at the top of the cylinder bottom is fixedly connected a cylinder barrel, on both sides of the inner wall of the cylinder barrel are inserted second blocks, on the inner wall of the cylinder barrel is fitted a first sealing ring, on both sides of the outer wall of the first sealing ring are fixedly connected to the outer walls of the second blocks, on the inner wall of the first sealing ring is fitted a piston rod which extends to the outside of the cylinder barrel, at the top inner wall of the cylinder bottom is inserted a first block, at the top of the first block is fixedly connected a top cover, the bottom of the top cover fits on the outer wall top of the cylinder barrel, outside the cylinder barrel is provided a replacement device, the replacement device includes a handle, a connecting plate, a threaded rod and a curved plate, at the end of the handle is fixedly connected a connecting plate, on one side of the connecting plate is fixedly connected a threaded rod, on the outer wall of the threaded rod is threadedly connected a curved plate, the threaded rod is threadedly connected to the cylinder barrel, and the end of the curved plate away from the threaded rod is fixedly connected to the outer wall of the top cover;

[0007] Preferably, at the bottom side of the cylinder barrel is communicated a first pipeline, and at the top side of the cylinder barrel is communicated a second pipeline.

[0008] Preferably, at the bottom of the piston rod is fixedly connected a mounting plate, and the mounting plate is fixedly connected with a piston by bolts.

[0009] Preferably, the outer wall of the piston fits on the inner wall of the cylinder barrel, and on the outer wall of the piston is sleeved a second sealing ring, and the outer of the second sealing ring fits on the inner wall of the cylinder barrel.

[0010] Preferably, on the side of the curved plate is provided a limiting device, the limiting device includes an L-shaped column, a pull rod and a spring, one end of the L-shaped column is fixedly connected to the outer wall of the curved plate, inside the L-shaped column is inserted the pull rod, the pull rod is movably connected with the L-shaped column, and between the pull rod and the L-shaped column is fixedly connected a spring.

[0011] Preferably, the end of the pull rod is inserted into the inside of the curved plate, the outer wall of the pull rod is inserted into the inside of the connecting plate, and the pull rod is movably connected with the connecting plate.

[0012] The utility model has the following beneficial effects: For this combined seal structure of the hydraulic cylinder, through the cooperation among the handle, the connecting plate, the threaded rod and the curved plate, it can achieve quick replacement of the first sealing ring, which is convenient for replacing the first sealing ring, and solves the problem that when replacing the top sealing ring of the existing combined seal structure of the hydraulic cylinder, it is rather troublesome and slow, thus being inconvenient for replacing the sealing ring at the top of the hydraulic cylinder.

[0013] Through the cooperation among the L-shaped column, the pull rod and the spring, the limit of the connecting plate is achieved, solving the problem that in the existing combined seal structure of the hydraulic cylinder during operation, the cylinder barrel shakes, causing the connecting plate to rotate, thereby reducing the firmness of the replacement device. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the present utility model;

[0015] Figure 2 It is a schematic external view of the present utility model;

[0016] Figure 3 It is Figure 1 a schematic structural diagram of the bottom cylinder, the top cover and the piston rod in

[0017] Figure 4 It is Figure 1 a schematic structural diagram of the middle curved column, the threaded rod and the curved plate in

[0018] Figure 5 It is Figure 1 a schematic enlarged structural diagram at A in

[0019] In the figure: 1. Bottom cylinder, 2. Mounting hole, 3. Cylinder barrel, 4. Piston rod, 5. Handle, 6. Connecting plate, 7. Threaded rod, 8. Curved plate, 9. Top cover, 10. First clamping block, 11. First sealing ring, 12. Second clamping block, 13. L-shaped column, 14. Pull rod, 15. Spring, 16. Mounting plate, 17. Piston, 18. Second sealing ring, 19. First pipeline, 20. Second pipeline. Detailed Embodiment

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0021] When replacing the sealing ring at the top of the existing hydraulic cylinder, it is rather troublesome and slow, thus making it inconvenient to replace the sealing ring at the top of the hydraulic cylinder.

[0022] In view of this, the present utility model provides a combined seal structure for a hydraulic cylinder. Through the cooperation among the handle, the connecting plate, the threaded rod and the curved plate, the first sealing ring can be quickly replaced, which is convenient for replacing the first sealing ring, solving the problem that when replacing the top sealing ring of the existing combined seal structure of the hydraulic cylinder, it is rather troublesome and slow, thus making it inconvenient to replace the sealing ring at the top of the hydraulic cylinder.

[0023] Those skilled in the art shall connect the components in this case in sequence. For the specific connection and operation sequence, reference should be made to the following working principle. The detailed connection means are well-known techniques in this field. The following mainly introduces the working principle and process.

[0024] Example 1. It can be seen from Figure 1-4 that a combined seal structure of a hydraulic cylinder in this case includes a cylinder bottom 1. An installation hole 2 is provided on the surface of the cylinder bottom 1. The cylinder bottom 1 is installed through the installation hole 2. The installation hole 2 penetrates the cylinder bottom 1. The number of the installation holes 2 is four. The shape of the installation hole 2 is a cylinder. A cylinder barrel 3 is fixedly connected to the top of the cylinder bottom 1. Second clamping blocks 12 are inserted on both sides of the inner wall of the cylinder barrel 3. The second clamping blocks 12 limit a first sealing ring 11. The first sealing ring 11 is attached to the inner wall of the cylinder barrel 3. The first sealing ring 12 seals the inside of the cylinder barrel 3. Both sides of the outer wall of the first sealing ring 11 are fixedly connected to the outer wall of the second clamping blocks 12. A piston rod 4 is attached to the inner wall of the first sealing ring 11. The piston rod 4 moves in the first sealing ring 11. The piston rod 4 extends to the outside of the cylinder barrel 3. A first clamping block 10 is inserted into the top inner wall of the cylinder bottom 1. A top cover 9 is fixedly connected to the top of the first clamping block 10. The first clamping block 10 positions the top cover 9 to facilitate the alignment of the top cover 9 with the cylinder barrel 3. The bottom of the top cover 9 is attached to the top of the outer wall of the cylinder barrel 3. A replacement device is provided outside the cylinder barrel 3. The replacement device includes a handle 5, a connection disk 6, a threaded rod 7 and a curved plate 8. The end of the handle 5 is fixedly connected to the connection disk 6. The handle 5 drives the connection disk 6 to rotate. A threaded rod 7 is fixedly connected to one side of the connection disk 6. The connection disk 6 drives the threaded rod 7 to rotate. The threaded rod 7 is threadedly connected to the curved plate 8. The threaded rod 7 rotates in the curved plate 8. The threaded rod 7 is threadedly connected to the cylinder barrel 3. The threaded rod 7 rotates out of the inside of the cylinder barrel 3. The end of the curved plate 8 away from the threaded rod 7 is fixedly connected to the outer wall of the top cover 9.

[0025] In the specific implementation process, it is particularly worth noting that the cylinder bottom 1 is installed through the installation hole 2. The installation hole 2 penetrates the cylinder bottom 1. The number of the installation holes 2 is four. The second clamping blocks 12 limit the first sealing ring 11. The first sealing ring 11 seals the inside of the cylinder barrel 3. The piston rod 4 moves in the first sealing ring 11. The first clamping block 10 positions the top cover 9 to facilitate the alignment of the top cover 9 with the cylinder barrel 3. The handle 5 drives the connection disk 6 to rotate. The connection disk 6 drives the threaded rod 7 to rotate. The threaded rod 7 rotates in the curved plate 8. The threaded rod 7 rotates out of the inside of the cylinder barrel 3, realizing the rapid replacement of the first sealing ring 11.

[0026] Specifically, when the first sealing ring 11 needs to be replaced, the staff rotates the handles 5 on the four faces in sequence. The handles 5 drive the connection disk 6 to rotate, and the connection disk 6 drives the threaded rod 7 to rotate. The threaded rod 7 rotates out of the inside of the curved plate 8. At this time, the staff pulls the curved plate 8 upward. The curved plate 8 drives the top cover 9 to move, and the top cover 9 drives the first clamping block 10 to move out of the inside of the cylinder barrel 3. The top cover 9 leaves the cylinder barrel 3, and the cylinder barrel 3 is opened. The staff takes out the first sealing ring 11 inside the cylinder barrel 3, puts the replaced first sealing ring 11 into the inside of the cylinder barrel 3, inserts the second clamping blocks 12 on both sides of the replaced first sealing ring 11 into the inner wall of the cylinder barrel 3. The staff puts the top cover 9 back on the top of the cylinder barrel 3 again, and the first clamping block 10 is inserted into the inside of the cylinder barrel 3 again. The staff rotates the handle 5 in the opposite direction, and the threaded rod 7 rotates back into the inside of the curved plate 8 to fix the top cover 9 again, completing the quick replacement of the first sealing ring 11 and facilitating the replacement of the first sealing ring 11.

[0027] Embodiment 2. As can be seen from Figure 1 、 2 and 5, a first pipeline 19 is connected to the bottom of the side of the cylinder barrel 3, and external hydraulic oil enters the bottom of the cylinder barrel 3 through the first pipeline 19. A second pipeline 20 is connected to the top of the side of the cylinder barrel 3, and the hydraulic oil inside the cylinder barrel 3 flows out through the second pipeline 20.

[0028] In the specific implementation process, it is particularly pointed out that external hydraulic oil enters the bottom of the cylinder barrel 3 through the first pipeline 19, and the hydraulic oil inside the cylinder barrel 3 flows out through the second pipeline 20 to realize the operation of the hydraulic cylinder.

[0029] Furthermore, a mounting plate 16 is fixedly connected to the bottom of the piston rod 4. The mounting plate 16 drives the piston rod 4 to move. The mounting plate 16 is fixedly connected with a piston 17 through bolts. The staff can replace the piston 17 by rotating the bolts. The piston 17 drives the mounting plate 16 to move.

[0030] In the specific implementation process, it is particularly pointed out that the mounting plate 16 drives the piston rod 4 to move, the piston 17 drives the mounting plate 16 to move, and the staff can replace the piston 17 by rotating the bolts, realizing the movement of the piston rod 4 and the replacement of the piston 17.

[0031] Furthermore, the outer wall of the piston 17 fits against the inner wall of the cylinder barrel 3. A second sealing ring 18 is sleeved on the outer wall of the piston 17. The second sealing ring 18 increases the sealing performance between the piston 17 and the cylinder barrel 3. The outer part of the second sealing ring 18 fits against the inner wall of the cylinder barrel 3.

[0032] In the specific implementation process, it is particularly pointed out that the second sealing ring 18 increases the sealing performance between the piston 17 and the cylinder barrel 3, realizing the sealing between the piston 17 and the cylinder barrel 3.

[0033] Specifically, when the external hydraulic oil enters the bottom of the cylinder barrel 3 through the first pipeline 19, the hydraulic oil drives the piston 17 to move at this time. The piston 17 drives the bolt and the mounting plate 16 to move, and the mounting plate 16 drives the piston rod 4 to rise. At this time, the hydraulic oil at the top of the cylinder barrel 3 is discharged through the second pipeline 20. If the external hydraulic oil enters the cylinder barrel 3 through the second pipeline 20, the piston rod 4 descends.

[0034] Embodiment 3. It can be seen from Figure 1-4 that a limiting device is arranged on the side surface of the curved plate 8. The limiting device includes an L-shaped column 13, a pull rod 14 and a spring 15. One end of the L-shaped column 13 is fixedly connected to the outer wall of the curved plate 8. The L-shaped column 13 supports the pull rod 14. The L-shaped column 13 is an inverted L-shaped. The pull rod 14 is inserted into the inner wall of the L-shaped column 13. The pull rod 14 is movably connected to the L-shaped column 13. When the pull rod 14 moves, the pull rod 14 slides in the L-shaped column 13. A spring 15 is fixedly connected between the pull rod 14 and the L-shaped column 13. The pull rod 14 is fixed by the elastic deformation of the spring 15;

[0035] In the specific implementation process, the L-shaped column 13 supports the pull rod 14. The L-shaped column 13 is an inverted L-shaped. When the pull rod 14 moves, the pull rod 14 slides in the L-shaped column 13. The pull rod 14 is fixed by the elastic deformation of the spring 15 to limit the connecting disc 6 and prevent the connecting disc 6 from rotating;

[0036] Furthermore, the end of the pull rod 14 is inserted into the inside of the curved plate 8, and the outer wall of the pull rod 14 is inserted into the inside of the connecting disc 6. The pull rod 14 first penetrates into the connecting disc 6 and then into the curved plate 8. The pull rod 14 is movably connected to the connecting disc 6;

[0037] In the specific implementation process, the pull rod 14 first penetrates into the connecting disc 6 and then into the curved plate 8 to limit the connecting disc 6;

[0038] Specifically, when the connecting disc 6 rotates, the staff first pulls the pull rod 14. The pull rod 14 drives the spring 15 to move. The pull rod 14 slides in the L-shaped column 13. The pull rod 14 first leaves the curved plate 8 and finally leaves the connecting disc 6. At this time, the staff can rotate the handle 5 to drive the connecting disc 6 to rotate and release the limit of the connecting disc 6. When the connecting disc 6 finishes rotating, the staff releases the pull rod 14. At this time, the spring 15 rebounds and drives the pull rod 14 back to the initial position by the elastic force to limit the connecting disc 6 and prevent the connecting disc 6 from rotating when the cylinder barrel 3 shakes, affecting the firmness of the replacement device.

[0039] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A combined seal structure for a hydraulic cylinder, comprising a cylinder bottom (1), characterized in that: The surface of the cylinder bottom (1) is provided with mounting holes (2) which penetrate through the cylinder bottom (1). A cylinder barrel (3) is fixedly connected to the top of the cylinder bottom (1). Second clamping blocks (12) are inserted into both sides of the inner wall of the cylinder barrel (3). A first sealing ring (11) is attached to the inner wall of the cylinder barrel (3). Both sides of the outer wall of the first sealing ring (11) are fixedly connected to the outer walls of the second clamping blocks (12). A piston rod (4) is attached to the inner wall of the first sealing ring (11). The piston rod (4) extends to the outside of the cylinder barrel (3). A first clamping block (10) is inserted into the top inner wall of the cylinder bottom (1). A top cover (9) is fixedly connected to the top of the first clamping block (10). The bottom of the top cover (9) is attached to the top of the outer wall of the cylinder barrel (3). A replacement device is arranged outside the cylinder barrel (3). The replacement device includes a handle (5), a connecting plate (6), a threaded rod (7) and a curved plate (8). One end of the handle (5) is fixedly connected to the connecting plate (6). A threaded rod (7) is fixedly connected to one side of the connecting plate (6). A curved plate (8) is threadedly connected to the outer wall of the threaded rod (7). The threaded rod (7) is threadedly connected to the cylinder barrel (3). One end of the curved plate (8) far away from the threaded rod (7) is fixedly connected to the outer wall of the top cover (9).

2. The combined seal structure of a hydraulic cylinder according to claim 1, wherein: A first pipe (19) communicates with the bottom of the side of the cylinder barrel (3), and a second pipe (20) communicates with the top of the side of the cylinder barrel (3).

3. A combined seal structure for a hydraulic cylinder according to claim 1, characterized in that: A mounting plate (16) is fixedly connected to the bottom of the piston rod (4). A piston (17) is fixedly connected to the mounting plate (16) by bolts.

4. A combined seal structure of a hydraulic cylinder according to claim 3, characterized in that: The outer wall of the piston (17) is attached to the inner wall of the cylinder barrel (3). A second sealing ring (18) is sleeved on the outer wall of the piston (17). The outer side of the second sealing ring (18) is attached to the inner wall of the cylinder barrel (3).

5. A combined seal structure of a hydraulic cylinder according to claim 1, characterized in that: A limiting device is arranged on the side of the curved plate (8). The limiting device includes an L-shaped column (13), a pull rod (14) and a spring (15). One end of the L-shaped column (13) is fixedly connected to the outer wall of the curved plate (8). A pull rod (14) is inserted into the inner wall of the L-shaped column (13). The pull rod (14) is movably connected to the L-shaped column (13). A spring (15) is fixedly connected between the pull rod (14) and the L-shaped column (13).

6. A combined seal structure for a hydraulic cylinder according to claim 5, characterized in that: The end of the pull rod (14) is inserted into the inside of the curved plate (8). The outer wall of the pull rod (14) is inserted into the inside of the connecting plate (6). The pull rod (14) is movably connected to the connecting plate (6).

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