Cylinder body sealing structure

Abstract

The utility model discloses a cylinder body sealing structure which comprises a barrel body, an end cover is arranged at the top of the barrel body, a piston rod is connected to the top of the end cover in a sliding mode, a piston head is arranged at the bottom of the piston rod, a sealing assembly is arranged on the circumferential outer wall of the piston head, and a dustproof assembly located on the circumferential outer wall of the piston rod is arranged on the circumferential inner wall of the end cover. The sealing performance of the hydraulic cylinder is improved through the sealing rubber ring, friction during movement of the piston rod is reduced, the sealing rubber ring is abraded after long-term use, the thickness of the sealing rubber ring is reduced, and then the extrusion action of the sealing rubber ring and the compensation rubber ring on the pressing ring is weakened; and secondly, the sealing performance is improved through the sealing ring and the Glyd ring, dust is prevented from entering the cylinder along the circumferential outer wall of the piston rod to affect the viscosity of hydraulic oil through the dustproof ring, and the attached dust is conveniently scraped away through the scraping ring when the piston rod moves.

Description

Technical Field

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

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion. It has a simple structure and reliable operation. When used to achieve reciprocating motion, it eliminates the need for a speed reduction device, has no transmission backlash, and provides smooth movement. During the operation of a hydraulic cylinder, the piston's sealing is particularly important as it reciprocates within the cylinder barrel.

[0003] The prior art patent document CN214887650U provides a piston sealing structure, including an outer sealing ring and an inner sealing ring. After assembly, the inner circumference of the inner sealing ring and the outer circumference of the piston body elastically abut against each other and are interference-fitted, so that a good seal is formed between the outer sealing ring and the cavity wall of the sliding cavity. When the outer sealing ring gradually wears, the interference between the outer sealing ring and the cavity wall of the sliding cavity decreases. The inner sealing ring causes the outer sealing ring to expand outward to compensate for the reduced interference due to the wear of the outer sealing ring. This ensures the sealing performance between the sealing element and the cavity wall of the sliding cavity, improves the situation where the traditional piston sealing structure is prone to sealing failure due to wear, and greatly improves the service life of the piston.

[0004] Although the device has many beneficial effects, it still has the following problems: During the use of the device, the elasticity of the inner sealing ring has a limited compensation effect. When the inner sealing ring casting is restored, the compensation effect will gradually weaken, and it is difficult to stably compensate for the elasticity of the outer sealing ring. Secondly, during the use of the device, dust may enter the hydraulic cylinder with the piston rod, affecting the viscosity of the hydraulic oil, which needs to be improved. In view of this, we propose a cylinder sealing structure. Utility Model Content

[0005] The purpose of this section is to outline some aspects of the embodiments of this utility model and to briefly introduce some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be used to limit the scope of this utility model.

[0006] 1. Technical problems to be solved:

[0007] To address the issues mentioned above, such as the limited compensation effect of the inner sealing ring's elasticity, the gradual weakening of the compensation effect as the inner sealing ring casting recovers, the difficulty in stably compensating for the elasticity of the outer sealing ring, and the potential for dust to enter the hydraulic cylinder with the piston rod, affecting the viscosity of the hydraulic oil, this utility model is proposed.

[0008] Therefore, the purpose of this utility model is to provide a cylinder sealing structure that provides good compensation for the sealing ring, facilitates the maintenance of the hydraulic cylinder's sealing performance, and has a good dustproof effect to prevent dust from entering the hydraulic cylinder.

[0009] 2. Technical Solution:

[0010] To solve the above-mentioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0011] A cylinder sealing structure includes a cylinder with an end cap at the top. A piston rod is slidably connected to the top of the end cap. A piston head is located at the bottom of the piston rod. A sealing assembly is provided on the outer circumference of the piston head. The sealing assembly includes an installation groove formed on the outer circumference of the piston head. A receiving groove is formed at the top of the installation groove. Multiple springs are provided at the top of the receiving groove. A pressure ring is provided at the bottom of the springs. A compensating rubber ring is provided at the bottom of the installation groove. A sealing rubber ring is provided on the outer circumference of the compensating rubber ring. A dustproof assembly is provided on the inner circumference of the end cap, located on the outer circumference of the piston rod.

[0012] In a preferred embodiment of the cylinder sealing structure of this utility model, the dustproof component includes a sealing ring, a dustproof ring on the top of the sealing ring, a scraper ring on the top of the dustproof ring, a groove on the outer circumference of the dustproof ring, and a Gladius ring on the inner circumference of the groove.

[0013] In a preferred embodiment of the cylinder sealing structure of this utility model, the bottom of the outer circumferential wall of the pressure ring is inclined, and the bottom of the outer circumferential wall of the pressure ring abuts against the inner circumferential wall of the compensation rubber ring.

[0014] In a preferred embodiment of the cylinder sealing structure of this utility model, the cross-section of the Glyd ring is H-shaped, and the size and position of the slot match the size and position of the Glyd ring.

[0015] In a preferred embodiment of the cylinder sealing structure of this utility model, the sealing ring and the sealing ring are both made of nitrile rubber, and the dustproof ring is made of PTFE.

[0016] As a preferred embodiment of the cylinder sealing structure of this utility model, the piston head is provided with guide rings at the top and bottom of its circumferential outer wall, and the diameter of the guide rings matches the inner diameter of the cylinder.

[0017] As a preferred embodiment of the cylinder sealing structure of this utility model, a flange ring is provided on the top of the outer circumferential wall of the cylinder, and a plurality of bolts are arranged in an annular array on the top of the end cover.

[0018] 3. Beneficial effects:

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] This type of cylinder sealing structure improves the sealing performance of the hydraulic cylinder through the sealing rubber ring and reduces the friction during piston rod movement. After long-term use, the sealing rubber ring wears down and its thickness decreases. As a result, the squeezing effect of the sealing rubber ring and the compensating rubber ring on the pressure ring weakens. The spring's rebound force drives the pressure ring to move downward, thereby causing the compensating rubber ring to move outward and fit tightly against the inner wall of the cylinder circumference to compensate for the wear.

[0021] This cylinder sealing structure improves sealing performance through sealing rings and Glyd rings, prevents dust from entering the cylinder along the outer circumference of the piston rod and affecting the viscosity of the hydraulic oil through a dustproof ring, and facilitates the removal of adhering dust when the piston rod moves through a scraper ring. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0023] Figure 1 This is a schematic diagram of the overall structure of a cylinder sealing structure according to the present invention;

[0024] Figure 2 This is a schematic diagram of the piston rod and piston head structure of a cylinder sealing structure according to the present invention;

[0025] Figure 3 This is a cross-sectional schematic diagram of the sealing component structure of a cylinder sealing structure according to the present invention;

[0026] Figure 4 This is a cross-sectional schematic diagram of the dustproof component structure of a cylinder sealing structure according to the present invention.

[0027] The following are the labels in the diagram: 1. Cylinder; 2. End cap; 3. Piston rod; 4. Piston head; 5. Sealing assembly; 6. Dustproof assembly; 7. Guide ring; 8. Flange ring; 9. Bolt; 501. Mounting groove; 502. Receiving groove; 503. Spring; 504. Pressure ring; 505. Compensating rubber ring; 506. Sealing ring; 601. Sealing ring; 602. Dustproof ring; 603. Scraper ring; 604. Slot; 605. Glyd ring. Detailed Implementation

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0029] This utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this utility model. In actual manufacturing, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0030] The orientation or positional relationship indicated in the terminology is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing the present invention and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0031] The term "connection method" should be interpreted broadly. For example, "connection" 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 a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] The embodiments of this utility model will now be described in further detail with reference to the accompanying drawings.

[0033] This utility model provides an overall structural diagram of one embodiment of a cylinder sealing structure, including:

[0034] Please see Figures 1-4 This embodiment of a cylinder sealing structure includes a cylinder 1, an end cap 2 threadedly connected to the top of the cylinder 1, a piston rod 3 slidably connected to the top of the end cap 2, a piston head 4 fixedly mounted at the bottom of the piston rod 3, and a sealing assembly 5 slidably connected to the outer circumference of the piston head 4. The sealing assembly 5 includes a mounting groove 501 formed on the outer circumference of the piston head 4, a receiving groove 502 formed at the top of the mounting groove 501, a plurality of springs 503 fixedly mounted at the top of the receiving groove 502, a pressure ring 504 fixedly mounted at the bottom of the springs 503, and a compensating rubber ring 505 slidably connected to the bottom of the mounting groove 501. A sealing ring 506 is fixedly provided on the wall, and a dustproof component 6 located on the outer wall of the piston rod 3 is fixedly provided on the inner circumference of the end cover 2. The sealing ring 506 improves the sealing performance of the hydraulic cylinder and reduces the friction when the piston rod 3 moves. After long-term use, the sealing ring 506 wears down and its thickness decreases. As a result, the squeezing effect of the sealing ring 506 and the compensating ring 505 on the pressure ring 504 weakens. The spring 503 pushes the pressure ring 504 downward, thereby causing the compensating ring 505 to move the sealing ring 506 outward and press it against the inner circumference of the cylinder 1 to compensate for the wear.

[0035] It is worth noting that, in order to improve user comfort, the dustproof component 6 specifically includes a sealing ring 601, a dustproof ring 602 fixedly mounted on the top of the sealing ring 601, a scraper ring 603 fixedly mounted on the top of the dustproof ring 602, a groove 604 opened on the outer circumference of the dustproof ring 602, and a Glyd ring 605 engaged on the inner circumference of the groove 604. The sealing performance is improved by the sealing ring 601 and the Glyd ring 605. The dustproof ring 602 prevents dust from entering the cylinder 1 along the outer circumference of the piston rod 3 and affecting the viscosity of the hydraulic oil. The scraper ring 603 facilitates the removal of the attached dust when the piston rod 3 moves.

[0036] Next, in order to facilitate the outward movement of the compensating rubber ring 505, specifically, the bottom of the outer circumference of the pressure ring 504 is inclined, and the bottom of the outer circumference of the pressure ring 504 abuts against the inner circumference of the compensating rubber ring 505. The pressure ring 504 abuts against the inner circumference of the compensating rubber ring 505, which facilitates the pressure ring 504 to better compress the compensating rubber ring 505 when it moves downward.

[0037] Meanwhile, to prevent the Glyd ring 605 from falling off, specifically, the cross-section of the Glyd ring 605 is H-shaped, and the size and position of the slot 604 match the size and position of the Glyd ring 605. By using an H-shaped Glyd ring 605 that matches the size and position of the slot 604, the stability of the Glyd ring 605 is improved.

[0038] Furthermore, to improve assembly stability, specifically, the sealing ring 506 and the sealing ring 601 are both made of nitrile rubber, while the dust ring 602 is made of PTFE. Nitrile rubber is mainly used to manufacture oil-resistant rubber products, and its acrylonitrile content has five different ranges. The higher the acrylonitrile content, the better the oil resistance. Nitrile rubber also has good water resistance, airtightness, and excellent adhesion. PTFE is polytetrafluoroethylene, also known as Teflon, a high molecular polymer polymerized from tetrafluoroethylene as a monomer. It has excellent heat and cold resistance, acid and alkali resistance, resistance to various organic solvents, and a long service life.

[0039] It is worth noting that, in order to guide the piston head 4 to move up and down, guide rings 7 are fixed at the top and bottom of the outer circumference of the piston head 4. The diameter of the guide rings 7 matches the inner diameter of the cylinder 1. The guide rings 7, whose diameter matches the inner diameter of the cylinder 1, facilitate the guidance of the piston head 4.

[0040] Finally, in order to improve the connection stability of the end cap 2, specifically, a flange ring 8 is welded to the top of the outer circumference of the cylinder 1, and multiple bolts 9 are connected to the top of the end cap 2 by an annular array of threads. By screwing in the bolts 9, the end cap 2 is connected to the flange ring 8, making the connection between the end cap 2 and the cylinder 1 tighter.

[0041] Combination Figures 1-4 The cylinder sealing structure of this embodiment is used in the following specific process:

[0042] 1. According to actual use, after long-term use, the sealing ring 506 wears down and the thickness of the sealing ring 506 decreases. As a result, the squeezing effect of the sealing ring 506 and the compensating ring 505 on the pressure ring 504 weakens. The rebound force of the spring 503 drives the pressure ring 504 to move downward, squeezing the compensating ring 505 and causing the compensating ring 505 to move outward. This causes the sealing ring 506 to move outward and fit tightly against the inner circumference of the cylinder 1, compensating for the wear.

[0043] 2: A Glyd ring 605 is snapped into the inner wall of the groove 604, and a sealing ring 601 is installed on the inner wall of the end cover 2. A dustproof ring 602 prevents dust from entering the cylinder 1. When the piston rod 3 moves, a scraper ring 603 scrapes off the dust adhering to the outer wall of the piston rod 3.

[0044] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A cylinder sealing structure characterized by comprising: The utility model relates to a cylinder (1) top is equipped with end cover (2), end cover (2) top slidingly connected has piston rod (3), piston rod (3) bottom is equipped with piston head (4), piston head (4) circumferential outer wall is equipped with sealing assembly (5), sealing assembly (5) includes the installation groove (501) being opened in piston head (4) circumferential outer wall, installation groove (501) top is equipped with the containing groove (502), containing groove (502) top is equipped with a plurality of spring (503), spring (503) bottom is equipped with compression ring (504), installation groove (501) bottom is equipped with compensation rubber ring (505), compensation rubber ring (505) circumferential outer wall is equipped with sealing rubber ring (506), end cover (2) circumferential inner wall is equipped with the dustproof assembly (6) being located in piston rod (3) circumferential outer wall.

2. The cylinder sealing structure according to claim 1, characterized by The dustproof assembly (6) includes a sealing ring (601), the sealing ring (601) top is equipped with dustproof ring (602), the dustproof ring (602) top is equipped with scraping ring (603), the dustproof ring (602) circumferential outer wall is equipped with the clamping groove (604), and the clamping groove (604) circumferential inner wall is equipped with a gasket (605).

3. The cylinder sealing structure according to claim 2, characterized by The bottom of the compression ring (504) circumferential outer wall is inclined, and the bottom of the compression ring (504) circumferential outer wall abuts against the circumferential inner wall of the compensation rubber ring (505).

4. The cylinder sealing structure according to claim 3, characterized by The cross section of the gasket (605) is H-shaped, and the size and position of the clamping groove (604) are matched with the size and position of the gasket (605).

5. The cylinder seal structure according to claim 4, characterized by The material of the sealing rubber ring (506) and the material of the sealing ring (601) are both nitrile rubber, and the material of the dustproof ring (602) is PTFE.

6. The cylinder seal structure according to claim 5, characterized by The top and bottom of the piston head (4) circumferential outer wall are both equipped with a guide ring (7), and the diameter of the guide ring (7) is matched with the inner diameter of the cylinder (1).

7. The cylinder seal structure according to claim 6, characterized by The top of the cylinder (1) circumferential outer wall is equipped with a flange ring (8), and the top of the end cover (2) is annularly arranged with a plurality of bolts (9).

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