Press fitting tool for piston sealing element

Abstract

The utility model discloses a piston sealing element press-fitting tool which is characterized in that a sealing element is pushed by a pressing sleeve to move along a guide conical surface of a guide sleeve, and in the pushing process, the inner wall of a pressing part of the pressing sleeve is tightly attached to the guide conical surface and slowly opens in an umbrella shape under the action of the guide conical surface. And the elastic body is assembled into the piston sealing groove along the conical surface of the guide sleeve. The pressing sleeve structure can protect the elastic body of the sealing element from being damaged in the press fitting process, the elastic body is not twisted or overturned, and the sealing effect of the piston is better. After press-fitting is finished, the press-in part of the pressing sleeve can quickly return to the original shape, the piston and the elastic body are convenient to replace, and the assembly efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing component press-fitting, in particular to a piston sealing component press-fitting tool. Background Art

[0002] At present, when the industry is performing press-fitting operations on seals, it is mainly done by using two flat-blade screwdrivers or ribbons to unilaterally expand the combined sealing elastomer and rotate it into the groove of the piston. During this assembly process, the inner ring of the combined sealing elastomer is stressed, and the edges of the flat-blade screwdriver or ribbon will damage the elastomer if the force is too great, thereby affecting the sealing effect of the piston.

[0003] In the prior art, such as the Chinese utility model patent with application number 201521065758X, it discloses a device for assembling piston seals, which is achieved by rationally utilizing tools such as a pusher, an expander, and a shaping sleeve. An expander is provided at the outer end of the piston, and the seal sleeve after heating and softening is placed on the guide surface of the expander. The seal is pushed along the guide surface of the expander by the pusher until the seal is pushed into the sealing groove of the piston. However, during the assembly process, the pusher cannot always keep in contact with the guide surface of the expander, causing the seal to flip and twist during the assembly process. In addition, the device also requires the use of a shaping sleeve to complete the assembly of the seal. Therefore, the device has problems such as low efficiency and easy damage to the seal, which affects the sealing effect of the piston. Utility Model Content

[0004] In order to overcome the problems in the prior art of low assembly efficiency, easy damage to the seal, and influence on the sealing effect of the piston during the seal assembly process.

[0005] In view of at least one of the above technical problems, the utility model provides a piston seal press fitting tool, which pushes the seal to move along the guide cone surface of the guide sleeve through the press sleeve. During the pushing process, the inner wall of the press-in part of the press sleeve fits tightly with the guide cone surface and slowly opens in an umbrella shape under the action of the guide cone surface. The elastic body is assembled into the piston seal groove along the guide cone surface. The specific technical solution is as follows:

[0006] A piston seal press-fitting tool comprises: a press sleeve and a guide sleeve, wherein the guide sleeve comprises a connecting portion sleeved on the end of the piston and a guide cone surface for guiding the movement of the seal, and the press sleeve is used to push the seal to move along the guide cone surface into the piston seal groove, and comprises a press-in portion sleeved on the outside of the guide cone surface and capable of opening in an umbrella shape on the guide cone surface.

[0007] Furthermore, a plurality of strip-shaped grooves are provided on the pressing sleeve wall at one end of the pressing sleeve to divide the pressing sleeve along the circumferential direction, so as to form a pressing portion that can be opened in an umbrella shape on the guiding conical surface.

[0008] Furthermore, the strip-shaped groove extends axially along the pressing sleeve, and its length is greater than the length of the guiding cone surface.

[0009] Furthermore, one end of the pressing sleeve away from the pressing portion is provided with a pressing head groove connected to a pressing machine, and there is a clearance fit between the pressing head groove and the pressing head of the pressing machine.

[0010] Furthermore, the connecting portion of the guide sleeve is a stepped groove, and the ram groove and the ram of the press are clearance-fitted.

[0011] Furthermore, the guide sleeve is made of grade steel, and the pressure sleeve is made of high-elastic stainless steel.

[0012] Furthermore, each edge of the pressing sleeve and the guide sleeve is provided with a rounded corner.

[0013] Compared with the prior art, the above piston seal press-fitting tool has the following beneficial effects:

[0014] The utility model uses a pressing sleeve to push the seal to move along the guide cone surface of the guide sleeve, so that the elastic body is assembled into the piston sealing groove along the guide cone surface. During the pushing process, the pressing part of the pressing sleeve slowly opens in an umbrella shape under the action of the guide cone surface, so that its inner wall keeps in close contact with the guide cone surface. The pressing sleeve structure of the utility model can protect the sealing elastic body from damage during the pressing process, and the elastic body is not twisted or turned, so that the sealing effect of the piston is better. After the pressing is completed, the pressing part of the pressing sleeve can quickly return to its original state, which is convenient for replacing the piston and the elastic body and improving the assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the press-fitting tooling of the utility model;

[0016] Figure 2 It is a cross-sectional view of the guide sleeve of the utility model;

[0017] Figure 3 It is a structural schematic diagram of the compression sleeve of the utility model, (a is a cross-sectional view, b is a bottom view);

[0018] Explanation of the numbers in the figure: 1. pressing sleeve; 11. pressing head groove; 12. pressing part; 2. guide sleeve; 21. guiding cone surface; 22. connecting part; 3. sealing element; 4. piston. DETAILED DESCRIPTION

[0019] In order to better understand the purpose, structure and function of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below.

[0020] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "provided with" and any variations thereof in this application are open-ended and are intended to cover non-exclusive inclusions.

[0021] The serial numbers assigned to the components herein are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" mentioned in this disclosure, unless otherwise specified, includes both direct and indirect "connections". In the description of this application, it should be understood that the directional terms "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on Figure 1 The orientations or positional relationships shown are only for the convenience of description and do not indicate or imply that the devices or units referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0022] like Figure 1 As shown, the utility model proposes a piston seal press fitting, which cooperates with a vertical press to assemble the seal 3 into the sealing groove of the piston 4. In this embodiment, the seal 3 is a combined seal, including an elastomer, two retaining rings and two guide rings.

[0023] The piston seal press-fitting tool proposed in the utility model comprises: a guide sleeve 2 and a press sleeve 1, wherein the guide sleeve 2 comprises a connecting portion 22 sleeved on the end of the piston 4 and a guide cone 21 guiding the seal 3 to move. The press sleeve 1 is cylindrical, and its bottom is a press-in portion 12. Four strip grooves are arranged on the wall of the press-in portion 12 to divide it in the circumferential direction, and the strip grooves extend axially along the press sleeve 1. During press-fitting, the seal 3 is sleeved on the end of the guide cone 21 of the guide sleeve 2, and the press-in portion 12 of the press sleeve 1 abuts against the upper side of the seal 3, pushing the seal 3 to move along the guide cone 21 into the sealing groove of the piston 4. During the pushing process, the inner wall of the press-in portion 12 of the press sleeve 1 remains in close contact with the guide cone 21, and slowly opens in an umbrella shape under the action of the guide cone 21. The press sleeve 1 in this embodiment can protect the elastomer of the seal 3 from damage during the press-fitting process, and the elastomer is not twisted or turned over, so that the sealing effect of the piston 4 is better. After the press-fitting is completed, the pressing portion 12 of the press sleeve 1 can be quickly restored to its original state, which is convenient for replacing the piston 4 and the sealing member 3 and improving the assembly efficiency.

[0024] In some embodiments, Figure 3As shown, the material of the pressing sleeve 1 is high elastic stainless steel. The strip groove of the pressing portion 12 extends upward from the bottom of the pressing sleeve 1 along its axis, the width of the strip groove is 4mm, and its length L4 is greater than the length of the guide cone 21 of the guide sleeve 2. In the process of pushing, the inner wall of the pressing portion 12 can always keep in close contact with the guide cone 21, ensuring the smooth progress of the press-fitting operation.

[0025] In some embodiments, the end of the pressing sleeve 1 away from the pressing portion 12 is provided with a pressing head groove 11 connected to the pressing head of the press, and the inner diameter D4 of the pressing head groove 11 is matched with the clearance of the pressing head of the press, and the clearance amount is 0.2mm, which can achieve quick assembly. The depth L3 of the pressing head groove 11 is equal to two-thirds of the length of the pressing head of the press, ensuring the reliability of the connection between the pressing head of the press and the pressing sleeve 1. The inner diameter D5 of the pressing portion 12 is interference fit with the annular raised part of the elastomer, and the interference amount is 1mm. The edges of the pressing sleeve 1 are rounded to avoid scratching the elastomer during assembly.

[0026] In some embodiments, Figure 2 As shown, the material of the guide sleeve 2 is 45# (45# steel) and has been quenched and tempered. The specific structural form of the connecting portion 22 can be selected according to the shape and size of the piston 4. For example, when there is a step on the outer diameter of the piston 4, the connecting portion 22 adopts a stepped groove structure, and the stepped groove is clearance-matched with the piston 4, and the clearance is 0.3mm~0.35mm. The first step length L1 of the stepped groove is greater than the size of the first sealing groove of the piston 4; the difference between the second step length L2 of the stepped groove and the first step length L1 is consistent with the step size of the piston 4. The guide cone 21 end of the guide sleeve 2 is in the shape of a truncated cone, and its small end diameter D3 is smaller than the inner diameter of the elastomer of the seal 3; the edges of the guide sleeve 2 are rounded to avoid scratching the elastomer of the seal 3 and the piston 4 during assembly.

[0027] It can be understood that the above description is only for illustrating the specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the disclosure scope of the present application.

Claims

1. A piston seal press-fitting tool, characterized in that: include: A pressing sleeve (1) and a guide sleeve (2), wherein the guide sleeve (2) comprises a connecting portion (22) sleeved on the end of a piston (4) and a guide conical surface (21) for guiding the movement of a sealing member (3), and the pressing sleeve (1) is used to push the sealing member (3) to move along the guide conical surface (21) into a sealing groove of the piston (4), and comprises a pressing portion (12) sleeved on the outside of the guide conical surface (21) and capable of opening in an umbrella shape on the guide conical surface (21).

2. The piston seal press-fitting tool according to claim 1, characterized in that: A plurality of strip-shaped grooves are provided on the pressing sleeve wall at one end of the pressing sleeve (1) to divide the pressing sleeve in the circumferential direction, thereby forming a pressing portion (12) that can be opened in an umbrella shape on the guide conical surface (21).

3. The piston seal press-fitting tool according to claim 2, characterized in that: The strip-shaped groove extends axially along the pressing sleeve (1), and its length is greater than the length of the guiding conical surface (21).

4. The piston seal press-fitting tool according to claim 2, characterized in that: An end of the pressing sleeve (1) away from the pressing portion (12) is provided with a pressing head groove (11) connected to a pressing machine, and a clearance fit is formed between the pressing head groove (11) and the pressing head of the pressing machine.

5. The piston seal press-fitting tool according to claim 1, characterized in that: The connecting portion (22) of the guide sleeve (2) is a stepped groove, and there is a clearance fit between the stepped groove and the piston (4).

6. The piston seal press-fitting tool according to claim 1, characterized in that: The guide sleeve (2) is made of 45# steel, and the pressure sleeve (1) is made of high-elastic stainless steel.

7. The piston seal press-fitting tool according to claim 1, characterized in that: Each edge of the pressing sleeve (1) and the guide sleeve (2) is provided with a rounded corner.

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