Novel AGC oil cylinder dustproof structure

Abstract

The utility model provides a novel AGC oil cylinder dustproof structure, an AGC oil cylinder comprises a shell and a piston rod, a sealing area is arranged at the joint of the shell and the piston rod, the dustproof structure is arranged in the sealing area, the dustproof structure comprises a sealing ring, an upper isolation cover and a lower isolation cover, the upper isolation cover is arranged between the sealing ring and the shell, and the lower isolation cover is arranged between the sealing ring and the piston rod. A secondary blocking area is arranged between the upper isolation cover and the sealing ring, a secondary blocking area is arranged between the upper isolation cover and the shell and the sealing ring, the lower isolation cover is arranged between the sealing ring and the shell, a primary blocking area is arranged between the upper isolation cover and the shell and between the upper isolation cover and the sealing ring, and the primary blocking area and the secondary blocking area are continuously distributed on the outer side of the sealing ring. And dust is prevented from entering the shell to pollute oil and affect the normal use performance of the oil cylinder, and the double protection mechanism can be implemented in the reverse direction so as to achieve the protection effect on hydraulic oil from inside to outside.

Description

Technical Field

[0001] The utility model relates to the technical field of oil cylinder sealing and dustproofing, in particular to a novel AGC oil cylinder dustproofing structure. Background Art

[0002] In order to prevent dust and impurities from entering the inside of the AGC cylinder, it is often necessary to set a dust-proof structure with a certain dust-proof function at the front end cover of the AGC cylinder. The front end cover is the part where the piston rod (the output part of the cylinder) can extend relative to the AGC cylinder. When a traditional cylinder sets a sealing dust-proof structure here, it is achieved through an interference fit between the piston rod and the sealing ring, and the sealing ring is loaded in the front end cover. Although this method can achieve sealing around the piston rod to prevent the entry of dust, due to the interference fit, the long-term reciprocating motion of the piston rod causes the sealing ring to be greatly worn, which is not conducive to long-term use.

[0003] In the prior art, a patent with announcement number CN217950860U proposes a new dustproof structure for an AGC cylinder. The application optimizes the dustproof ring structure, specifically adopts a double-lip structure at the top and the bottom. In principle, the original structure that achieves sealing and dustproofing through interference fit of the inner hole size (that is, the inner diameter of the sealing ring is smaller than the rod diameter) is changed to a structure that achieves dustproofing through space compression sealing.

[0004] Although the spatial compression sealing method has improved the problem of the sealing ring being susceptible to wear, its protective mechanism is still relatively simple in its function, and there is room for improvement in the protection effect against dust and impurities. Utility Model Content

[0005] In response to the defects existing in the prior art, the utility model provides a new AGC oil cylinder dustproof structure, which provides a multi-level protection mechanism. When the previous layer of protection mechanism fails, the subsequent layer will take over, making it more difficult for the sealing of the oil cylinder to be interfered with and fail, thereby improving the protection effect of the AGC oil cylinder against dust and impurities.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A novel dustproof structure for an AGC oil cylinder. The AGC oil cylinder comprises a shell and a piston rod. A sealing area is provided at the connection between the shell and the piston rod, and a dustproof structure is provided in the sealing area. The dustproof structure comprises a sealing ring, an upper partition cover and a lower partition cover. The upper partition cover is provided between the sealing ring and the shell, and a secondary barrier area is provided between the shell and the sealing ring. The lower partition cover is provided between the sealing ring and the shell, and a primary barrier area is provided between the upper partition cover, the shell and the sealing ring. The primary barrier area and the secondary barrier area are continuously distributed on the outside of the sealing ring.

[0008] As a further solution of the utility model: the top end of the sealing ring is in extrusion contact with the inner wall of the shell.

[0009] As a further solution of the utility model: the sealing ring is in a round tube shape and is slidably sleeved relative to the piston rod.

[0010] As a further solution of the utility model: the upper partition cover is in the shape of an inverted conical tube, one end of the upper partition cover is plugged and fixed with the sealing ring, and the other end is in contact with the top end of the inner wall of the shell.

[0011] As a further solution of the utility model: the lower baffle includes a pointed corner portion, a first connecting portion and a second connecting portion. The first connecting portion is distributed on the side of the pointed corner portion facing the piston rod, and the connection with the sealing ring is vertical. The second connecting portion is distributed on the side of the pointed corner portion facing the shell, and the connection with the shell is horizontal.

[0012] As a further solution of the utility model: a first slot cooperating with the first connecting part is formed on the sealing ring, a second slot cooperating with the second connecting part is formed on the inner wall of the shell, and vertical sections of the first slot and the second slot are both T-shaped.

[0013] As a further solution of the utility model: the vertical section of the pointed corner is V-shaped, one end of the pointed corner faces the inner side of the shell, and the oil is divided into an inner layer and an outer layer when contacting the pointed corner.

[0014] Beneficial effects of the utility model:

[0015] The double combined protection mechanism achieves effective dust blocking from the outside to the inside, preventing dust from entering the housing and contaminating the oil, affecting the normal performance of the cylinder. The double protection mechanism can also be implemented in the reverse direction to achieve the effect of protecting the hydraulic oil from the inside to the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the AGC cylinder structure;

[0017] Figure 2 It is a schematic diagram of the relative setting area of ​​the new dustproof structure and the AGC oil cylinder provided by the utility model;

[0018] Figure 3 This is a schematic diagram of the cross-sectional structure of the utility model connected with the AGC oil cylinder;

[0019] Figure 4 This is a schematic diagram of the exploded structure of the utility model connected with the AGC oil cylinder;

[0020] Figure 5 This is a schematic diagram of the distribution of the primary barrier area and the secondary barrier area of ​​the utility model;

[0021] Figure 6 It is a schematic diagram of the detailed structure of the utility model in vertical section.

[0022] In the figure: 1, sealing ring; 2, upper partition cover; 3, lower partition cover; 301, sharp corner; 302, first connecting part; 303, second connecting part; 401, first slot; 402, second slot. DETAILED DESCRIPTION

[0023] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.

[0024] like Figure 1-6 As shown, a novel dustproof structure of an AGC cylinder is shown. The AGC cylinder includes a shell and a piston rod. A sealing area is provided at the connection between the shell and the piston rod. The sealing area is provided with a dustproof structure. The dustproof structure includes a sealing ring 1, an upper partition cover 2 and a lower partition cover 3. The upper partition cover 2 is provided between the sealing ring 1 and the shell, and a secondary barrier area is provided between the shell and the sealing ring 1. The lower partition cover 3 is provided between the sealing ring 1 and the shell, and a primary barrier area is provided between the upper partition cover 2, the shell and the sealing ring 1. The primary barrier area and the secondary barrier area are continuously distributed on the outside of the sealing ring 1.

[0025] The purpose of dust protection for the AGC oil cylinder is to prevent external dust and other impurities from contacting the oil inside the shell. The following describes the dual protection mechanisms from outside to inside and from inside to outside of the dust protection structure constructed in this application:

[0026] Double protection mechanism from outside to inside: From outside to inside, the first protection mechanism is the combination of the seal ring 1 body and the primary barrier area, refer to Figure 6 The degree of sealing of the sealing ring 1 to the piston rod in the vertical direction is determined by the thickness of the sealing ring 1. When a crack appears at the joint between the sealing ring 1 and the shell, dust enters the shell and is blocked in the primary barrier area outside the upper partition cover 2. Even if the crack spreads to the upper partition cover 2, the dust continues to fall and is still blocked in the secondary barrier area when it touches the lower partition cover 3. The double combined protection mechanism realizes effective dust blocking from the outside to the inside, preventing dust from entering the shell and contaminating the oil, thereby affecting the normal performance of the cylinder.

[0027] Double protection mechanism from the inside to the outside: Although in the present application, the sealing method adopted is a non-interference connection (but the sealing is ensured by increasing the thickness of the sealing ring 1), but in the actual use process, as the piston rod continues to reciprocate, the friction between it and the sealing ring 1 will still cause the sealing ring 1 to deform, resulting in hydraulic leakage. To prevent this phenomenon from occurring, the above-mentioned double protection mechanism is implemented from the reverse direction, which can achieve the effect of protecting the hydraulic oil from the inside to the outside. Specifically, when the deformation degree of the sealing ring 1 is small, the setting of the lower partition cover 3 can effectively block it, and when the deformation degree of the sealing ring 1 is large, it affects the connection between it and the lower partition cover 3. At this time, even if the hydraulic oil breaks through the barrier of the lower partition cover 3 and enters the secondary barrier area, it will still be blocked by the upper partition cover 2 and the primary barrier area, making it difficult to overflow from the connecting gap between the piston rod and the shell, thereby ensuring the normal use performance of the cylinder as a whole.

[0028] On the basis of the implementation of the above, the top end of the sealing ring 1 is in extrusion contact with the inner wall of the shell, ensuring that the sealing performance can be guaranteed when the secondary barrier area is formed.

[0029] The sealing ring 1 is in the shape of a circular tube and is slidably sleeved relative to the piston rod. A tubular sealing structure is selected to increase the length of the sealing surface formed from the vertical upwards, which is adapted to the action mechanism of the other components in the present application.

[0030] The upper shroud 2 is in the shape of an inverted conical tube, one end of which is plugged and fixed to the sealing ring 1, and the other end is abutted against the top of the inner wall of the shell. The upper shroud 2 adopts a conical shape to form a certain inclination on the vertical plane, which not only increases its own structural strength, but also makes it difficult for the oil to adhere to its surface when it comes into contact with it.

[0031] The lower baffle 3 includes a pointed corner portion 301, a first connecting portion 302 and a second connecting portion 303. The first connecting portion 302 is distributed on the side of the pointed corner portion 301 facing the piston rod, and the connection with the sealing ring 1 is vertical. The second connecting portion 303 is distributed on the side of the pointed corner portion 301 facing the shell, and the connection with the shell is horizontal. The lower baffle 3 is the part of the entire sealing and dustproof structure that directly contacts the hydraulic oil surface. The vertical section of the pointed corner portion 301 is V-shaped, and one end of the pointed corner faces the inner side of the shell. Its pointed shape will divide the oil into an inner layer and an outer layer when it contacts the pointed corner portion 301. Compared with the impact generated by the entire oil surface, such stratification can differentiate and weaken the impact of the hydraulic oil on the sealing structure during the operation of the cylinder, thereby reducing the possibility of deformation of the relevant sealing structure from the root and significantly increasing the performance of the corresponding sealing structure.

[0032] The sealing ring 1 is provided with a first slot 401 which cooperates with the first connecting portion 302, and the inner wall of the housing is provided with a second slot 402 which cooperates with the second connecting portion 303. The vertical sections of the first slot 401 and the second slot 402 are both T-shaped. First, from the overall shape of the connection, refer to Figure 5 The connecting surface on one side of the lower partition 3 is horizontal, and the other side is vertical. When subjected to friction and impact of hydraulic oil, the force will be dispersed in two mutually perpendicular directions to ensure the stability of the connection of the lower partition 3. Then, from the details of the connection parts, they are all in the shape of a barbed T. The embedded shape makes the connection stronger and is more conducive to the lower partition 3 to exert its sealing performance.

[0033] The above is a detailed description of an embodiment of the utility model, but the content is only a preferred embodiment of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent modifications and improvements made according to the scope of application of the utility model should be included in the scope of patent coverage of the utility model.

Claims

1. A new dustproof structure of AGC oil cylinder, the AGC oil cylinder comprises a shell and a piston rod, the connection between the shell and the piston rod is provided with a sealing area, characterized in that: The sealing area is provided with a dustproof structure, and the dustproof structure comprises: Sealing ring (1); An upper isolation cover (2) is arranged between the sealing ring (1) and the shell, and a secondary isolation zone is provided between the shell and the sealing ring (1); The lower partition cover (3) is arranged between the sealing ring (1) and the shell, and a primary barrier zone is provided between the upper partition cover (2), the shell and the sealing ring (1). The primary barrier zone and the secondary barrier zone are continuously distributed outside the sealing ring (1).

2. A novel AGC oil cylinder dustproof structure according to claim 1, characterized in that: The top end of the sealing ring (1) is in extrusion contact with the inner wall of the shell.

3. A novel AGC oil cylinder dustproof structure according to claim 1, characterized in that: The sealing ring (1) is in the shape of a circular tube and is slidably sleeved relative to the piston rod.

4. A novel AGC oil cylinder dustproof structure according to claim 1, characterized in that: The upper diaphragm (2) is in the shape of an inverted conical tube. One end of the upper diaphragm (2) is plugged and fixed to the sealing ring (1), and the other end is in contact with the top end of the inner wall of the shell.

5. The novel AGC oil cylinder dustproof structure according to claim 1 is characterized in that: The lower partition cover (3) comprises: A sharp corner portion (301); The first connecting portion (302) is located on the side of the pointed corner portion (301) facing the piston rod, and the connection with the sealing ring (1) is vertical; The second connection portion (303) is distributed on the side of the pointed corner portion (301) facing the shell, and the connection with the shell is horizontal.

6. A novel AGC oil cylinder dustproof structure according to claim 5, characterized in that: The sealing ring (1) is provided with a first slot (401) cooperating with the first connecting portion (302), and the inner wall of the shell is provided with a second slot (402) cooperating with the second connecting portion (303), and the vertical sections of the first slot (401) and the second slot (402) are both T-shaped.

7. The novel AGC oil cylinder dustproof structure according to claim 5 is characterized in that: The vertical section of the pointed corner (301) is V-shaped, with one end of the pointed corner facing the inner side of the shell, and the oil is divided into an inner layer and an outer layer when contacting the pointed corner (301).

Images