Sealing device based on piston type hydraulic cylinder

Abstract

The utility model relates to the technical field of hydraulic cylinders, and discloses a sealing device based on a piston type hydraulic cylinder, which comprises a hydraulic cylinder body, a first oil pipe, a second oil pipe, a sealing sleeve, a piston rod and a first piston block, the first oil pipe is arranged at the top of the hydraulic cylinder body, and the second oil pipe is arranged on one side, corresponding to the first oil pipe, of the top of the hydraulic cylinder body. A sealing sleeve is arranged at one end of the hydraulic cylinder body, a piston rod is arranged in the sealing sleeve, a first piston block is arranged at the position, corresponding to the interior of the hydraulic cylinder body, of one end of the piston rod, and a sealing device for preventing leakage of the first piston block is arranged in the hydraulic cylinder body. The hydraulic cylinder sealing device is compact and reasonable in structural design, the problem that a common sealing device cannot be suitable for hydraulic cylinders of different sizes is solved, and the sealing performance of the hydraulic cylinder is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a sealing device based on a piston type hydraulic cylinder. Background Art

[0002] The 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, and is widely used in hydraulic systems of various machines. The hydraulic cylinder is basically composed of a cylinder barrel and a cylinder head, a piston and a piston rod, a sealing device, etc., and the sealing device of the hydraulic cylinder is a key component to ensure the normal operation of the hydraulic system. Its main purpose is to prevent the leakage of the working medium and the entry of foreign matter from the outside. The piston seal is mainly used at the piston end of the hydraulic cylinder, and its function is to prevent the leakage of the working medium inside the hydraulic cylinder. However, the general sealing device is a sealing ring, and it is necessary to manually install a sealing ring of a certain specification into the groove of the piston, so that the sealing ring cannot be applied to hydraulic cylinders of different sizes, and thus cannot fit tightly against the cylinder body, which reduces the sealing of the hydraulic cylinder. Moreover, once the sealing ring is damaged by friction for a long time, it is troublesome to replace it, which affects the working efficiency of the hydraulic cylinder. For this reason, we propose a sealing device based on a piston hydraulic cylinder. Utility Model Content

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies in the prior art, the utility model provides a sealing device based on a piston-type hydraulic cylinder, which solves the above-mentioned problems.

[0005] (II) Technical solution

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a sealing device based on a piston-type hydraulic cylinder, comprising a hydraulic cylinder body, a first oil pipe, a second oil pipe, a sealing sleeve, a piston rod and a first piston block, the top of the hydraulic cylinder body is provided with the first oil pipe, and the top of the hydraulic cylinder body is provided with the second oil pipe on one side corresponding to the first oil pipe, and one end of the hydraulic cylinder body is provided with a sealing sleeve, the inside of the sealing sleeve is provided with a piston rod, and one end of the piston rod is provided with the first piston block corresponding to the inside of the hydraulic cylinder body, and further comprising:

[0007] A sealing device is provided inside the hydraulic cylinder body to prevent leakage of the first piston block;

[0008] One end of the first piston block is provided with an extrusion device for enhancing the effect of the sealing device.

[0009] Preferably, one end of the first piston block is provided with four movable grooves, and the other end of the first piston block is fixedly connected to a piston rod, one end of the piston rod passes through one side of the hydraulic cylinder body and is movably connected to the inside of the sealing sleeve.

[0010] Preferably, the sealing device includes a second piston block, a sealing ring and a fixed rod, one end of the first piston block is fixedly connected to four fixed rods, one end of the four fixed rods is fixedly connected to the second piston block, and a sealing ring is movably connected between the first piston block and the second piston block.

[0011] Preferably, a threaded groove is provided on one side of the second piston block, and the internal thread of the threaded groove is connected to a threaded rod, and both sides of the sealing ring are tightly attached to one side of the first piston block and the second piston block, and one side of the four fixing rods is sleeved inside the sealing ring, and the sealing ring is made of rubber.

[0012] Preferably, the extrusion device includes a movable block, a telescopic cylinder, a fixed cylinder, a connecting rod, an extrusion plate and a slider, one end of the first piston block is fixedly connected to the fixed cylinder, one end of the fixed cylinder is movably connected to the telescopic cylinder, one end of the telescopic cylinder is fixedly connected to the movable block, and the outer surface of the telescopic cylinder is movably connected to four groups of connecting rods, one end of the movable block is movably connected to the inside of the threaded groove, one end of the four groups of connecting rods are movably connected to four extrusion plates, and four sliders are fixedly connected to the bottom of the four extrusion plates.

[0013] Preferably, the interior of the telescopic cylinder is hollow, and a spring is fixedly connected to the inner wall of the telescopic cylinder, and one end of the spring is fixedly connected to one end of the fixed cylinder.

[0014] Preferably, the four extrusion plates are L-shaped, and four sliders are fixedly connected to one side of the transverse plates of the four extrusion plates, one side of the four sliders is movably connected to the inside of the four movable grooves, and the vertical plates of the four extrusion plates are movably connected to the inside of the sealing ring.

[0015] (III) Beneficial effects

[0016] Compared with the prior art, the utility model provides a sealing device based on a piston-type hydraulic cylinder, which has the following beneficial effects:

[0017] 1. The sealing device of the hydraulic cylinder drives the telescopic cylinder to press down on the fixed cylinder toward the first piston block through the movable block, thereby driving one end of the four groups of connecting rods on the telescopic cylinder to move toward the first piston block, so that the other ends of the four groups of connecting rods drive the four extrusion plates to move outward, and then the four movable grooves are used to limit the movement of the four sliders, so that the four sliders drive the four extrusion plates to expand along the tracks of the four movable grooves, so that the four sliders allow the sealing ring to expand outward, so that the outer surface of the sealing ring can be tightly attached to the inner wall of the hydraulic cylinder body without leaving any tiny gaps.

[0018] 2. The sealing device of the hydraulic cylinder, by loosening the threaded rod, allows the telescopic cylinder to utilize the elastic force of the spring fixedly connected between the telescopic cylinder and the fixed cylinder to move the telescopic cylinder on the fixed cylinder toward the second piston block, so that the telescopic cylinder can drive the four extrusion plates to contract through the four connecting rods, so that the four extrusion plates release the expansion movement of the sealing ring, so that the sealing ring can be replaced between the first piston block and the second piston block, thereby facilitating the replacement of the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of the hydraulic cylinder of the utility model;

[0021] Figure 3 This is a schematic diagram of the extrusion device of the utility model;

[0022] Figure 4 It is a cross-sectional schematic diagram of the extrusion device of the utility model.

[0023] In the figure: 1. hydraulic cylinder body; 2. first oil pipe; 3. second oil pipe; 4. sealing sleeve; 5. piston rod; 6. first piston block; 7. second piston block; 8. sealing ring; 9. movable groove; 10. threaded groove; 11. threaded rod; 12. fixed rod; 13. movable block; 14. telescopic cylinder; 15. spring; 16. fixed cylinder; 17. connecting rod; 18. extrusion plate; 19. slider. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-4 A sealing device based on a piston type hydraulic cylinder comprises a hydraulic cylinder body 1, a first oil pipe 2, a second oil pipe 3, a sealing sleeve 4, a piston rod 5 and a first piston block 6, wherein the first oil pipe 2 is arranged on the top of the hydraulic cylinder body 1, and the second oil pipe 3 is arranged on the side of the top of the hydraulic cylinder body 1 corresponding to the first oil pipe 2, and the sealing sleeve 4 is arranged on one end of the hydraulic cylinder body 1, the piston rod 5 is arranged inside the sealing sleeve 4, and the first piston block 6 is arranged on one end of the piston rod 5 corresponding to the inside of the hydraulic cylinder body 1, and further comprises:

[0026] A sealing device is provided inside the hydraulic cylinder body 1 to prevent leakage of the first piston block 6;

[0027] One end of the first piston block 6 is provided with an extrusion device for enhancing the sealing effect.

[0028] Furthermore, four movable grooves 9 are formed at one end of the first piston block 6 , and a piston rod 5 is fixedly connected to the other end of the first piston block 6 . One end of the piston rod 5 passes through one side of the hydraulic cylinder body 1 and is movably connected to the inside of the sealing sleeve 4 .

[0029] Furthermore, the sealing device includes a second piston block 7, a sealing ring 8 and a fixed rod 12. One end of the first piston block 6 is fixedly connected to four fixed rods 12, one end of the four fixed rods 12 is fixedly connected to the second piston block 7, and a sealing ring 8 is movably connected between the first piston block 6 and the second piston block 7.

[0030] Furthermore, a threaded groove 10 is provided on one side of the second piston block 7, and the internal thread of the threaded groove 10 is connected to a threaded rod 11, and both sides of the sealing ring 8 are tightly attached to one side of the first piston block 6 and the second piston block 7, and one side of the four fixing rods 12 is sleeved on the inside of the sealing ring 8, and the sealing ring 8 is made of rubber.

[0031] Furthermore, the extrusion device includes a movable block 13, a telescopic cylinder 14, a fixed cylinder 16, a connecting rod 17, an extrusion plate 18 and a slider 19, one end of the first piston block 6 is fixedly connected to the fixed cylinder 16, one end of the fixed cylinder 16 is movably connected to the telescopic cylinder 14, one end of the telescopic cylinder 14 is fixedly connected to the movable block 13, and the outer surface of the telescopic cylinder 14 is movably connected to four groups of connecting rods 17, one end of the movable block 13 is movably connected to the inside of the threaded groove 10, one end of the four groups of connecting rods 17 is movably connected to four extrusion plates 18, and four sliders 19 are fixedly connected to the bottom of the four extrusion plates 18.

[0032] Furthermore, the interior of the telescopic cylinder 14 is in a hollow state, and a spring 15 is fixedly connected to the inner wall of the telescopic cylinder 14 , and one end of the spring 15 is fixedly connected to one end of the fixed cylinder 16 .

[0033] Furthermore, the four extrusion plates 18 are L-shaped, and four sliders 19 are fixedly connected to one side of the transverse plates of the four extrusion plates 18, one side of the four sliders 19 is movably connected to the inside of the four movable grooves 9, and the vertical plates of the four extrusion plates 18 are movably connected to the inside of the sealing ring 8.

[0034] Working principle: When the piston of the hydraulic cylinder needs to be sealed, firstly, the threaded rod 11 is tightened on the second piston block 7 through the threaded connection between the threaded rod 11 and the threaded groove 10, so that one end of the threaded rod 11 pushes the movable block 13 toward the telescopic cylinder 14, so that the movable block 13 drives the telescopic cylinder 14 to press down on the fixed cylinder 16 toward the first piston block 6, thereby driving one end of the four groups of connecting rods 17 on the telescopic cylinder 14 to move toward the first piston block 6, so that the other ends of the four groups of connecting rods 17 drive the four extrusion plates 18 to move outward, and then the four movable grooves 9 are used to limit the movement of the four sliders 19, so that the four sliders 19 drive the four extrusion plates 18 to expand along the tracks of the four movable grooves 9, so that The four sliders 19 allow the sealing ring 8 to expand outward, so that the outer surface of the sealing ring 8 can be tightly attached to the inner wall of the hydraulic cylinder body 1 without leaving any tiny gaps, so that there will be no liquid leakage when the hydraulic cylinder is working. When it is necessary to replace the sealing ring 8, it is only necessary to loosen the threaded rod 11 so that the telescopic cylinder 14 can use the elastic force of the spring 15 fixedly connected between the telescopic cylinder 14 and the fixed cylinder 16 to make the telescopic cylinder 14 move toward the second piston block 7 on the fixed cylinder 16, so that the telescopic cylinder 14 can drive the four extrusion plates 18 to contract through the four connecting rods 17, so that the four extrusion plates 18 release the expansion movement of the sealing ring 8, so that the sealing ring 8 can be replaced from between the first piston block 6 and the second piston block 7.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealing device based on a piston type hydraulic cylinder, comprising a hydraulic cylinder body (1), a first oil pipe (2), a second oil pipe (3), a sealing sleeve (4), a piston rod (5) and a first piston block (6), wherein the first oil pipe (2) is arranged at the top of the hydraulic cylinder body (1), and the second oil pipe (3) is arranged at the side of the top of the hydraulic cylinder body (1) corresponding to the first oil pipe (2), and a sealing sleeve (4) is arranged at one end of the hydraulic cylinder body (1), a piston rod (5) is arranged inside the sealing sleeve (4), and a first piston block (6) is arranged at one end of the piston rod (5) corresponding to the inside of the hydraulic cylinder body (1), characterized in that: Also includes: A sealing device is provided inside the hydraulic cylinder body (1) to prevent leakage of the first piston block (6); One end of the first piston block (6) is provided with an extrusion device for enhancing the effect of the sealing device.

2. A sealing device based on a piston-type hydraulic cylinder according to claim 1, characterized in that: One end of the first piston block (6) is provided with four movable grooves (9), and the other end of the first piston block (6) is fixedly connected to a piston rod (5), one end of the piston rod (5) passes through one side of the hydraulic cylinder body (1) and is movably connected to the inside of the sealing sleeve (4).

3. A sealing device based on a piston-type hydraulic cylinder according to claim 1, characterized in that: The sealing device comprises a second piston block (7), a sealing ring (8) and a fixed rod (12); one end of the first piston block (6) is fixedly connected to four fixed rods (12); one end of the four fixed rods (12) is fixedly connected to the second piston block (7); and a sealing ring (8) is movably connected between the first piston block (6) and the second piston block (7).

4. A sealing device based on a piston-type hydraulic cylinder according to claim 3, characterized in that: A thread groove (10) is provided on one side of the second piston block (7), and a threaded rod (11) is connected to the internal thread of the thread groove (10), and two sides of the sealing ring (8) are tightly attached to one side of the first piston block (6) and the second piston block (7), and one side of the four fixing rods (12) is sleeved inside the sealing ring (8), and the sealing ring (8) is made of rubber.

5. The sealing device based on a piston type hydraulic cylinder according to claim 1, characterized in that: The extrusion device comprises a movable block (13), a telescopic cylinder (14), a fixed cylinder (16), a connecting rod (17), an extrusion plate (18) and a slider (19); one end of the first piston block (6) is fixedly connected to the fixed cylinder (16); one end of the fixed cylinder (16) is movably connected to the telescopic cylinder (14); one end of the telescopic cylinder (14) is fixedly connected to the movable block (13); and the outer surface of the telescopic cylinder (14) is movably connected to four groups of connecting rods (17); one end of the movable block (13) is movably connected to the inside of the threaded groove (10); one end of the four groups of connecting rods (17) is movably connected to four extrusion plates (18); and the bottoms of the four extrusion plates (18) are fixedly connected to four sliders (19).

6. A sealing device based on a piston-type hydraulic cylinder according to claim 5, characterized in that: The interior of the telescopic cylinder (14) is in a hollow state, and a spring (15) is fixedly connected to the inner wall of the telescopic cylinder (14), and one end of the spring (15) is fixedly connected to one end of the fixed cylinder (16).

7. The sealing device based on a piston-type hydraulic cylinder according to claim 5, characterized in that: The four extrusion plates (18) are L-shaped, and one side of the transverse plates of the four extrusion plates (18) is fixedly connected to four sliders (19), one side of the four sliders (19) is movably connected inside the four movable grooves (9), and the vertical plates of the four extrusion plates (18) are movably connected inside the sealing ring (8).

Images