Oil cylinder piston sealing ring assembly tool

Abstract

The utility model discloses an oil cylinder piston sealing ring assembly tool, which relates to the field of pistons, and adopts the technical scheme that the oil cylinder piston sealing ring assembly tool comprises a guide sleeve and a push sleeve, the outer surface of the guide sleeve is of an outer conical surface structure, and the large-diameter end of the outer conical surface structure is in butt joint with the end face of the piston. The push sleeve comprises a barrel section and an expansion section, the expansion section comprises a plurality of elastic push plates axially extending from one end of the barrel section, the end of the expansion section wraps and is in butt joint with the outer surface of the guide sleeve, and the inner diameter of the end of the expansion section is smaller than the circle diameter of the sealing ring in the natural state. The push sleeve can automatically adapt to the change of the outer diameter of the outer conical surface structure of the guide sleeve, the sealing ring is more easily pushed, the assembly efficiency is very high, and the assembly quality of the sealing ring is better and more stable.

Description

Technical Field

[0001] This utility model relates to the field of pistons, and in particular to a tooling for assembling piston seals for hydraulic cylinders. Background Technology

[0002] Pistons typically have sealing grooves on their outer circumference for installing sealing rings. To ensure effective sealing, the diameter of the sealing ring is designed to match the diameter of the sealing groove, meaning the inner diameter of the sealing ring is smaller than the outer diameter of the piston. Therefore, it's difficult to fit the sealing ring into the sealing groove during assembly. Existing related technologies, such as the DAS sealing ring installation fixture for a hydraulic cylinder piston disclosed in patent document CN203542518U, use a pusher and a conical sleeve to assemble the sealing ring onto the piston. However, this solution has some problems. Because the sealing ring's natural diameter differs from its diameter before entering the sealing groove, the pusher's inner diameter must be larger than the piston's outer diameter to consistently provide thrust. Therefore, during the sleeve insertion stage, the pusher can only contact the outer edge of the sealing ring. After the outer edge of the sealing ring is subjected to force, it acts on the inner side, increasing the friction between the sealing ring and the outer wall of the sleeve, making it difficult to push the sealing ring onto the sleeve, resulting in very difficult assembly. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a hydraulic cylinder piston sealing ring assembly fixture. The push sleeve can automatically adapt to the outer diameter change of the outer conical surface structure of the guide sleeve, making the sealing ring easier to push, resulting in very high assembly efficiency, better and more stable sealing ring assembly quality.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a hydraulic cylinder piston sealing ring assembly tooling, including a guide sleeve and a push sleeve;

[0005] The outer surface of the guide sleeve is an outer conical surface structure, and one end of the outer conical surface structure with a large diameter is in contact with the piston end face;

[0006] The push sleeve includes a cylindrical section and an expansion section. The expansion section includes several elastic push plates extending axially from one end of the cylindrical section. The end of the expansion section wraps around and abuts the outer surface of the guide sleeve. The inner diameter of the end of the expansion section is smaller than the diameter of the sealing ring in its natural state.

[0007] In use, firstly, the large diameter end of the guide sleeve is aligned with the end of the piston. The sealing ring is then placed on the outer surface of the guide sleeve. Next, the end of the expansion section of the push sleeve is aligned with the small diameter end of the guide sleeve and wrapped around the outer surface of the guide sleeve. The push sleeve is pushed towards one side of the piston. As it is pushed, the end of the expansion section expands on the outer surface of the guide sleeve and moves. The sealing ring located on the surface of the guide sleeve is pushed towards the large diameter end of the guide sleeve until it crosses the large diameter end of the guide sleeve and enters the outside of the piston. It is then pushed into the sealing groove of the piston. This completes the installation of the piston sealing ring.

[0008] Preferably, the cylindrical section and the expansion section are integrally formed, which can improve the service life.

[0009] Preferably, the expansion section is formed by axial wire cutting of a metal or plastic cylinder. This makes processing easier.

[0010] Preferably, the inner diameter of the larger diameter end of the outer conical structure is greater than or equal to the outer diameter of the piston end. This facilitates fitting the structure onto the piston.

[0011] Preferably, the system further includes a shaping sleeve, the inner wall of which has an inner conical surface structure. The smaller diameter end of the inner conical surface structure is larger than the outer diameter of the piston, but smaller than the outer diameter of the sealing ring located on the piston. After the sealing ring enters the sealing groove, the shaping sleeve is placed on the piston and pushed towards the sealing ring. The inner conical surface structure compresses the sealing ring, and combined with the rotational action, this achieves the effects of rotational shaping and static shaping of the sealing ring.

[0012] Preferably, the larger diameter end of the inner conical structure is larger than the outer diameter of the sealing ring located inside the piston, to ensure that the inner conical structure can contact the sealing ring.

[0013] The beneficial effects of this utility model are:

[0014] This solution allows for a very simple and convenient assembly of the sealing ring into the piston's sealing groove. The push sleeve can automatically adapt to changes in the outer diameter of the guide sleeve's outer conical surface structure, making the sealing ring easier to push, resulting in very high assembly efficiency, better and more stable sealing ring assembly quality. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only one of the drawings of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of an embodiment of the present utility model;

[0017] The components are: 1. Piston; 2. Guide sleeve; 3. Sealing ring; 4. Push sleeve; 5. Shaping sleeve. Detailed Implementation

[0018] To enhance understanding of this utility model, it will be described in further detail below with reference to the accompanying drawings and embodiments. These embodiments are only used to explain this utility model and do not limit the scope of protection of this utility model.

[0019] Example

[0020] like Figure 1 As shown, a hydraulic cylinder piston sealing ring assembly fixture includes a guide sleeve 2 and a push sleeve 4; the outer surface of the guide sleeve 2 is an external conical structure, and one end of the large diameter of the external conical structure is in contact with the end face of the piston 1; the push sleeve 4 includes a cylindrical section and an expansion section, the expansion section includes several elastic push plates extending axially from one end of the cylindrical section, the end of the expansion section wraps around and abuts the outer surface of the guide sleeve 2, and the inner diameter of the end of the expansion section is smaller than the diameter of the sealing ring 3 in its natural state.

[0021] In use, firstly, the large diameter end of the guide sleeve 2 is aligned with the end of the piston 1. The sealing ring 3 is then placed on the outer surface of the guide sleeve 2. Next, the end of the expansion section of the push sleeve 4 is aligned with the small diameter end of the guide sleeve 2 and wrapped around the outer surface of the guide sleeve 2. The push sleeve 4 is pushed towards one side of the piston 1. As it is pushed, the end of the expansion section expands and moves on the outer surface of the guide sleeve 2. The sealing ring 3 located on the surface of the guide sleeve 2 is pushed towards the large diameter end of the guide sleeve 2 until it crosses the large diameter end of the guide sleeve 2 and enters the outside of the piston 1. It is then pushed into the sealing groove of the piston 1. This completes the installation of the sealing ring 3 on the piston 1.

[0022] During actual assembly, in order to make it easier for the sealing ring 3 to be pushed into the sealing groove, the sealing ring can be heated appropriately to make it softer.

[0023] The cylindrical section and the expansion section are integrally molded, which can improve the service life.

[0024] The expansion section is formed by axial line cutting of a metal or plastic cylinder, making it easier to process.

[0025] The inner diameter of the larger diameter end of the outer conical structure is greater than or equal to the outer diameter of the piston 1 end. This facilitates fitting the piston 1.

[0026] It also includes a shaping sleeve 5, the inner wall of which has an inner conical surface structure. The smaller diameter end of the inner conical surface structure is larger than the outer diameter of the piston 1, but smaller than the outer diameter of the sealing ring 3 located on the piston 1. After the sealing ring 3 enters the sealing groove, the shaping sleeve 5 is placed on the piston 1 and pushed towards the sealing ring 3. The inner conical surface structure will compress the sealing ring 3. Combined with the rotational action, this achieves the effect of rotational shaping and static shaping of the sealing ring 3.

[0027] The larger diameter end of the inner conical structure is larger than the outer diameter of the sealing ring 3 located inside the piston 1. This ensures that the inner conical structure can contact the sealing ring 3.

[0028] The beneficial effects of this utility model are:

[0029] Using this solution, the sealing ring 3 can be easily and conveniently assembled into the sealing groove of the piston 1, with very high assembly efficiency.

[0030] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0031] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A hydraulic cylinder piston seal ring assembly fixture, characterized in that, Includes guide sleeve (2) and push sleeve (4); The outer surface of the guide sleeve (2) is an outer conical surface structure, and one end of the outer conical surface structure with the large diameter is in contact with the end face of the piston (1); The push sleeve (4) includes a cylindrical section and an expansion section. The expansion section includes several elastic push plates extending axially from one end of the cylindrical section. The end of the expansion section wraps around and abuts the outer surface of the guide sleeve (2). The inner diameter of the end of the expansion section is smaller than the diameter of the sealing ring (3) in its natural state.

2. The hydraulic cylinder piston sealing ring assembly fixture according to claim 1, characterized in that: The cylindrical section and the expansion section are integrally formed.

3. The hydraulic cylinder piston sealing ring assembly fixture according to claim 1, characterized in that: The expansion section is formed by axial line cutting of a metal or plastic cylinder.

4. The hydraulic cylinder piston seal ring assembly fixture according to claim 1, characterized in that: The inner diameter of the larger diameter end of the outer conical structure is greater than or equal to the outer diameter of the piston (1) end.

5. The hydraulic cylinder piston sealing ring assembly fixture according to claim 1, characterized in that: It also includes a shaping sleeve (5), the inner wall of which is an inner conical structure. The small diameter end of the inner conical structure is larger than the outer diameter of the piston (1) and smaller than the outer diameter of the sealing ring (3) located on the piston (1).

6. The hydraulic cylinder piston seal ring assembly fixture according to claim 5, characterized in that: The larger diameter of the inner conical structure is greater than the outer diameter of the sealing ring (3) located inside the piston (1).

Images