Pipe expanding structure and pipe expanding device

Abstract

The utility model provides a kind of pipe expanding structure and pipe expanding device, it is related to expansion joint technical field, solve the technical problem of poor expansion joint effect in prior art when expansion joint. The pipe expanding structure and pipe expanding device include expansion head main body and press sleeve pipe body, press sleeve pipe body is sleeved on expansion head main body, and press sleeve pipe body can reciprocate along expansion head main body;Expansion head main body and press sleeve pipe body between being provided with compression assembly, compression assembly is used to drive press sleeve pipe body to move on expansion head main body, to make the end of press sleeve pipe body exceed expansion head main body end portion. The utility model is used to provide a kind of pipe expanding structure and pipe expanding device for improving expansion joint effect, guaranteeing expansion joint qualified rate.

Description

Technical Field

[0001] This utility model relates to the field of expansion joint technology, and in particular to an expansion tube structure and expansion tube device. Background Technology

[0002] Sheet metal parts and pipe fittings are typically connected using expansion joints. The expansion joint process involves inserting an expander into the pipe fitting, causing plastic deformation until the fitting is completely fitted onto the sheet metal part, and deforming the area around the hole in the sheet metal part. The expander is then removed. Because the pipe fitting undergoes plastic deformation while the sheet metal part remains in an elastic deformation state, the enlarged pipe diameter cannot shrink, while the hole wall in the sheet metal part elastically recovers, reducing the hole diameter (restoration). This results in a tight connection between the pipe fitting and the sheet metal part. This method utilizes the deformation between the pipe fitting and the groove in the sheet metal part's hole to achieve a tight and sealed connection. Using external force to cause plastic deformation at the end of the pipe fitting to connect it to the sheet metal part is also called pipe expansion, and it often uses an expander.

[0003] However, in the existing technology, when expanding the pipe joint, the expansion head is directly inserted into the pipe joint. This expansion method is prone to causing deformation of the sheet metal parts, resulting in unsatisfactory surface flatness of the sheet metal parts, poor expansion effect, and high scrap rate. Utility Model Content

[0004] The purpose of this utility model is to provide an expansion tube structure and device to solve the technical problem of poor expansion effect during expansion in the prior art. The various technical effects of the preferred technical solutions provided by this utility model are detailed below.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] The expansion tube structure provided by this utility model includes an expansion head body and a pressure sleeve body. The pressure sleeve body is sleeved on the expansion head body and can reciprocate along the expansion head body.

[0007] A clamping assembly is provided between the expansion head body and the pressure sleeve body. The clamping assembly is used to drive the pressure sleeve body to move on the expansion head body so that the end of the pressure sleeve body extends beyond the end of the expansion head body.

[0008] As an optional implementation, the clamping assembly is a sealed chamber disposed between the expansion head body and the pressure sleeve body.

[0009] As an optional implementation, a first sealing ring is provided on the outer wall of the expansion head body, and a second sealing ring is provided on the inner wall of the pressure sleeve tube. The outer diameter of the first sealing ring is adapted to the inner diameter of the pressure sleeve tube, and the inner diameter of the second sealing ring is adapted to the outer wall of the expansion head body, so as to form the sealing chamber between the first sealing ring and the second sealing ring.

[0010] As an optional implementation, the expansion head body is provided with a first main body segment and a second main body segment, the diameter of the first main body segment is smaller than the diameter of the second main body segment, and the first main body segment is disposed on the side away from the first end of the expansion head body;

[0011] The first sealing ring is disposed on the first main body segment, and the second sealing ring is fitted with the second main body segment.

[0012] As an optional implementation, the clamping assembly includes a clamping spring, and a fixing seat is provided at the second end of the expansion head body away from the pressure sleeve body, with the clamping spring disposed between the fixing seat and the pressure sleeve body.

[0013] As an optional implementation, a limiting boss is provided on the inner wall of the compression sleeve, the limiting boss is located on the moving path of the expansion head body, and the limiting boss is located on the side away from the first end of the expansion head body.

[0014] As an optional implementation, the fixing seat, the expansion head body, and the pressure sleeve body are concentrically assembled.

[0015] An expansion tube device, comprising the expansion tube structure as described above.

[0016] As an optional implementation, a workbench is also included, with the expansion head body disposed perpendicularly to the workbench;

[0017] The tube connector to be expanded is mounted on a sheet metal part, which is mounted on the worktable. The worktable is provided with a positioning pin, and the tube connector to be expanded is positioned by the positioning pin.

[0018] As an optional implementation, an intermediate gasket is also provided between the sheet metal part and the pressure sleeve body.

[0019] The beneficial effects of this utility model are as follows: The expansion tube structure and device provided by this utility model include an expansion head body and a pressure sleeve body. The expansion head body is used for expanding the pipe joint. The pressure sleeve body is sleeved on the expansion head body and can reciprocate along the expansion head body. A clamping component is provided between the expansion head body and the pressure sleeve body. The clamping component is used to drive the pressure sleeve body to move on the expansion head body so that the end of the pressure sleeve body extends beyond the end of the expansion head body. When expanding the pipe using the expansion tube structure provided by this utility model, firstly, the expansion head body and the pressure sleeve body move synchronously closer to the sheet metal part. Under the action of the clamping component, the end of the pressure sleeve body can be driven to extend beyond the end of the expansion head body, so that the pressure sleeve body can first abut against the sheet metal part and apply a pre-clamping force to the sheet metal part. After the pressure sleeve body abuts against the sheet metal part, the expansion head body continues to move, and the end of the expansion head body will extend out of the pressure sleeve body, thereby completing the expansion of the pipe joint. Compared with the existing technology, the expansion tube structure provided by this utility model can effectively avoid the problem of deformation of sheet metal parts when the pipe joint is expanded, effectively ensure the surface flatness of sheet metal parts, have a good expansion joint effect, and greatly improve the expansion joint qualification rate. Attached Figure Description

[0020] 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 or the prior art will be briefly introduced below. 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.

[0021] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model;

[0022] Figure 2 This is a cross-sectional view of Embodiment 1 of this utility model;

[0023] Figure 3 This is a structural schematic diagram of Embodiment 2 of the present invention;

[0024] Figure 4 This is a cross-sectional view of Embodiment 2 of this utility model;

[0025] Figure 5 This is a cross-sectional view of Embodiment 3 of this utility model.

[0026] In the picture:

[0027] 100. Expansion head body; 200. Compression sleeve body; 300. Compression assembly; 400. Intermediate gasket; 500. Sheet metal part; 600. Pipe fitting; 700. Fixing base;

[0028] 110. First main body section; 120. Second main body section; 130. First sealing ring body; 210. Second sealing ring body; 220. Limiting boss; 310. Sealing chamber; 320. Compression spring. Detailed Implementation

[0029] Please refer to the attached diagram below. Figures 1-5 This document explains the content of this utility model and its differences from existing technologies. The technical solutions (including preferred solutions) of this utility model are further described in detail below through accompanying drawings and examples of optional embodiments. It should be noted that any technical feature or solution in this embodiment is one or more of a variety of optional technical features or solutions. For the sake of brevity, this document cannot exhaustively list all alternative technical features and solutions of this utility model, nor is it convenient to emphasize that each implementation of a technical feature is one of multiple optional implementations. Therefore, those skilled in the art should understand that any technical means provided by this utility model can be replaced, or any two or more technical means or features provided by this utility model can be combined to obtain a new technical solution. No technical feature or solution in this embodiment limits the scope of protection of this utility model. The scope of protection of this utility model should include any alternative technical solutions that can be conceived by those skilled in the art without creative effort, as well as new technical solutions obtained by combining any two or more technical means or features provided by this utility model.

[0030] In the description of this invention, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and do not 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 this invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] This utility model provides a tube expansion structure and tube expansion device that improves the expansion effect and ensures the expansion qualification rate.

[0033] The following is combined with Figures 1-5 The technical solution provided by this utility model will be described in more detail.

[0034] This utility model provides an expansion tube structure, including an expansion head body 100 and a pressure sleeve body 200. The pressure sleeve body 200 is sleeved on the expansion head body 100 and can reciprocate along the expansion head body 100.

[0035] A clamping assembly 300 is provided between the expansion head body 100 and the pressure sleeve body 200. The clamping assembly 300 is used to drive the pressure sleeve body 200 to move on the expansion head body 100 so that the end of the pressure sleeve body 200 extends beyond the end of the expansion head body 100.

[0036] The expansion tube structure provided by this utility model includes an expansion head body 100 and a compression sleeve body 200. The expansion head body 100 is used for expanding the pipe connector 600. The compression sleeve body 200 is sleeved on the expansion head body 100 and can reciprocate along the expansion head body 100. A clamping assembly 300 is provided between the expansion head body 100 and the compression sleeve body 200. The clamping assembly 300 is used to drive the compression sleeve body 200 to move on the expansion head body 100 so that the end of the compression sleeve body 200 extends beyond the end of the expansion head body 100. When expanding the pipe using the expansion structure provided by this utility model, firstly, the expansion head body 100 and the pressure sleeve body 200 move synchronously towards the sheet metal part 500. Under the action of the clamping component 300, the end of the pressure sleeve body 200 can be driven to extend beyond the end of the expansion head body 100, thereby allowing the pressure sleeve body 200 to first abut against the sheet metal part 500, applying a pre-clamping force to the sheet metal part 500. After the pressure sleeve body 200 abuts against the sheet metal part 500, the expansion head body 100 continues to move, and the end of the expansion head body 100 will extend out of the pressure sleeve body 200, thus completing the expansion of the pipe joint 600. Compared with the prior art, the expansion structure provided by this utility model can effectively avoid the problem of easy deformation of the sheet metal part 500 when expanding the pipe joint 600, effectively ensure the surface flatness of the sheet metal part 500, achieve good expansion effect, and significantly improve the expansion qualification rate.

[0037] It should be noted that in some embodiments, an intermediate shim 400 is provided between the sheet metal part 500 and the pressure sleeve body 200, which can better ensure the surface flatness of the sheet metal part 500.

[0038] In some other embodiments, the intermediate gasket 400 is disposed on the sheet metal part 500. The intermediate gasket 400 is used for welding with other parts, thereby playing an isolation and sealing role in the product. By adopting the expansion tube structure provided by this utility model, the gap between the intermediate gasket 400 and the sheet metal part 500 can be effectively guaranteed, the surface flatness between the intermediate gasket 400 and the sheet metal part 500 can be well controlled, and the tightness of the expansion joint can also be improved to a certain extent.

[0039] In some embodiments of this utility model, the clamping assembly 300 is a sealed chamber 310 disposed between the expansion head body 100 and the pressure sleeve body 200.

[0040] In some embodiments of this utility model, a sealed chamber 310 is provided between the expansion head body 100 and the pressure sleeve body 200. When the expansion head body 100 and the pressure sleeve body 200 are driven to move relative to each other, the gas in the sealed chamber 310 can be compressed, thereby driving the pressure sleeve body 200 to move on the expansion head body 100, so that the end of the pressure sleeve body 200 extends beyond the end of the expansion head body 100. Thus, when the expansion tube structure provided by this utility model is used for tube expansion, the pressure sleeve body 200 can first abut against the sheet metal part 500, applying a pre-compression force to the sheet metal part 500. After the pressure sleeve body 200 abuts against the sheet metal part 500, the expansion head body 100 continues to move, and the end of the expansion head body 100 will extend out of the pressure sleeve body 200, thereby completing the expansion of the pipe joint 600. Compared with the prior art, the expansion tube structure provided by this utility model can effectively avoid the problem of deformation of sheet metal part 500 when the pipe joint 600 is expanded, and effectively ensure the surface flatness of sheet metal part 500.

[0041] In some embodiments of this utility model, a first sealing ring 130 is provided on the outer wall of the expansion head body 100, and a second sealing ring 210 is provided on the inner wall of the pressure sleeve body 200. The outer diameter of the first sealing ring 130 is adapted to the inner diameter of the pressure sleeve body 200, and the inner diameter of the second sealing ring 210 is adapted to the outer wall of the expansion head body 100, so as to form the sealing chamber 310 between the first sealing ring 130 and the second sealing ring 210.

[0042] In some embodiments of the present invention described above, a first sealing ring 130 is provided on the outer wall of the expansion head body 100, and a second sealing ring 210 is provided on the inner wall of the pressure sleeve body 200. A sealing chamber 310 is formed between the first sealing ring 130 and the second sealing ring 210. The gas pressure in the sealing chamber 310 can drive the end of the pressure sleeve body 200 beyond the end of the expansion head body 100. When the expansion head body 100 and the pressure sleeve body 200 are driven to move until the pressure sleeve body 200 abuts against the intermediate gasket 400 or against the sheet metal part 500, the expansion head body 100 continues to move towards the sheet metal part 500, thereby completing the tube expansion. During the tube expansion process, the gas pressure in the sealing chamber 310 can ensure that the pressure sleeve body 200 abuts against the intermediate gasket 400 or against the sheet metal part 500, thus ensuring the surface flatness of the intermediate gasket 400 and the sheet metal part 500.

[0043] In some embodiments of this utility model, the expansion head body 100 is provided with a first main body segment 110 and a second main body segment 120, the diameter of the first main body segment 110 is smaller than the diameter of the second main body segment 120, and the first main body segment 110 is disposed on the side away from the first end of the expansion head body 100.

[0044] The first sealing ring 130 is disposed on the first main body section 110, and the second sealing ring 210 cooperates with the second main body section 120.

[0045] In some embodiments of the present invention described above, the expansion head body 100 includes a first main body segment 110 and a second main body segment 120. The first sealing ring 130 is disposed on the first main body segment 110. The outer diameter of the first sealing ring 130 is adapted to the inner diameter of the pressure sleeve body 200. The second sealing ring 210 cooperates with the second main body segment 120, thereby ensuring that a sealed chamber is formed between the first sealing ring 130 and the second sealing ring 210. Furthermore, since the expansion head body 100 includes the first main body segment 110 and the second main body segment 120, and the diameter of the first main body segment 110 is smaller than the diameter of the second main body segment 120, the area of ​​the sealed chamber can be increased, thereby ensuring a better pressing effect and improving the surface flatness of the intermediate gasket 400 and the sheet metal part 500.

[0046] It is understandable that when the compression sleeve 200 abuts against the intermediate gasket 400 or the sheet metal part 500, and the expansion head body 100 moves downward to complete the expansion, as the expansion head body 100 resets, the gas pressure in the sealed chamber drives the compression sleeve 200 to reset.

[0047] In some embodiments of this utility model, the clamping assembly 300 includes a clamping spring 320, and a fixing seat 700 is provided at the second end of the expansion head body 100 away from the pressure sleeve body 200. The clamping spring 320 is disposed between the fixing seat 700 and the pressure sleeve body 200.

[0048] In some embodiments of the present invention described above, the clamping assembly 300 includes a clamping spring 320, which is disposed between the fixed base 700 and the clamping sleeve 200. When the expansion tube structure provided by the present invention is used for tube expansion, firstly, the expansion head body 100 and the clamping sleeve 200 move synchronously closer to the sheet metal part 500. Under the action of the clamping spring 320, the end of the clamping sleeve 200 can be driven to extend beyond the end of the expansion head body 100, thereby allowing the clamping sleeve 200 to abut against the sheet metal part 500 and apply a pre-clamping force to the sheet metal part 500. After the clamping sleeve 200 abuts against the sheet metal part 500, the expansion head body 100 continues to move, squeezing the clamping spring 320, and the end of the expansion head body 100 will extend out of the clamping sleeve 200, thereby completing the expansion of the pipe joint 600. Compared with the prior art, the expansion tube structure provided by this utility model can effectively avoid the problem of deformation of sheet metal part 500 when the pipe joint 600 is expanded, and effectively ensure the surface flatness of sheet metal part 500.

[0049] It is understood that the clamping assembly 300 may also include a clamping spring 320 and a sealing chamber 310. The clamping spring 320 and the sealing chamber 310 together apply a pre-clamping force to the sheet metal part 500, effectively ensuring the surface flatness of the sheet metal part 500 or ensuring the gap between the intermediate gasket 400 and the sheet metal part 500.

[0050] In some embodiments of this utility model, a limiting boss 220 is provided on the inner wall of the compression sleeve body 200. The limiting boss 220 is disposed on the moving path of the expansion head body 100, and the limiting boss 220 is disposed on the side away from the first end of the expansion head body 100.

[0051] In some of the embodiments of this utility model described above, by providing a limiting boss 220 on the inner wall of the pressure sleeve body 200, the limiting boss 220 can restrict the movement between the expansion head body 100 and the pressure sleeve body 200, thereby playing a limiting role.

[0052] In some embodiments of this utility model, the fixed base 700, the expansion head body 100, and the pressure sleeve body 200 are concentrically assembled.

[0053] This utility model also provides a tube expansion device, including the tube expansion structure described above.

[0054] The expansion device provided by this utility model includes the expansion structure described above, which also effectively avoids the problem of deformation of the sheet metal part 500 when the pipe joint 600 is expanded, and effectively ensures the surface flatness of the sheet metal part 500.

[0055] In some embodiments of this utility model, the tube expansion device further includes a worktable, and the expansion head body 100 is arranged perpendicularly to the worktable;

[0056] The expansion tube connector 600 is mounted on the sheet metal part 500, which is mounted on the worktable. The worktable is provided with a positioning pin, and the expansion tube connector 600 is positioned by the positioning pin.

[0057] In some embodiments of the present invention described above, the tube expansion device further includes a workbench, on which the tube joint 600 to be expanded is disposed on the sheet metal part 500. The sheet metal part 500 is disposed on the workbench, and the tube expansion structure is used to expand the tube joint 600 to ensure a tight expansion joint. The workbench is provided with a positioning pin, and the tube joint 600 to be expanded is positioned by the positioning pin, thereby ensuring accurate tube expansion position and ensuring expansion joint effect.

[0058] In some embodiments of this utility model, an intermediate gasket 400 is also provided between the sheet metal part 500 and the pressure sleeve body 200.

[0059] In some embodiments of the present invention described above, by providing an intermediate gasket 400 between the sheet metal part 500 and the pressure sleeve body 200, the intermediate gasket 400 directly contacts the pressure sleeve body 200, and the pressure sleeve body 200 can first abut against the intermediate gasket 400, thereby ensuring the surface flatness of the intermediate gasket 400 and the sheet metal part 500, and ensuring the gap between the intermediate gasket 400 and the sheet metal part 500, improving the expansion joint effect and the expansion joint tightness.

[0060] It should be noted that in some embodiments, the intermediate gasket 400 is welded to the sheet metal part 500. The intermediate gasket 400 is used to weld with the product parts and plays an isolation and sealing role in the product.

[0061] Example 1:

[0062] The expansion tube structure provided by this utility model includes an expansion head body 100 and a pressure sleeve body 200. The pressure sleeve body 200 is concentrically sleeved on the expansion head body 100, and the pressure sleeve body 200 can reciprocate along the expansion head body 100.

[0063] A fixing seat 700 is provided at the second end of the expansion head body 100 away from the pressure sleeve body 200. A compression spring 320 is provided between the fixing seat 700 and the pressure sleeve body 200. The elastic force of the compression spring 320 can drive the pressure sleeve body 200 to move on the expansion head body 100 so that the end of the pressure sleeve body 200 extends beyond the first end of the expansion head body 100.

[0064] Furthermore, a limiting boss 220 is provided on the inner wall of the compression sleeve body 200. The limiting boss 220 is located on the moving path of the expansion head body 100, and the limiting boss 220 is located on the side away from the first end of the expansion head body 100.

[0065] Example 2:

[0066] The expansion tube structure provided by this utility model includes an expansion head body 100 and a pressure sleeve body 200. The pressure sleeve body 200 is concentrically sleeved on the expansion head body 100 and can reciprocate along the expansion head body 100. A fixing seat 700 is provided at the second end of the expansion head body 100 away from the pressure sleeve body 200.

[0067] The expansion head body 100 is provided with a first body segment 110 and a second body segment 120. The diameter of the first body segment 110 is smaller than the diameter of the second body segment 120. The first body segment 110 is connected to the fixing seat 700, and the second body segment 120 is connected to the first body segment 110.

[0068] The first main body segment 110 is provided with a first sealing ring 130, the outer diameter of the first sealing ring 130 is adapted to the inner diameter of the pressure sleeve 200, and a second sealing ring 210 is provided on the inner wall of the pressure sleeve 200. The second sealing ring 210 cooperates with the second main body segment 120 to form a sealing chamber 310 between the first sealing ring 130 and the second sealing ring 210. The gas pressure in the sealing chamber 310 can drive the pressure sleeve 200 to move on the expansion head body 100 so that the end of the pressure sleeve 200 extends beyond the end of the expansion head body 100.

[0069] This utility model also provides a tube expansion device, including the tube expansion structure described above.

[0070] Furthermore, it also includes a worktable, with the expansion head body 100 being arranged perpendicularly to the worktable;

[0071] The expansion tube connector 600 is mounted on the sheet metal part 500, which is mounted on the worktable. The worktable is provided with a positioning pin, and the expansion tube connector 600 is positioned by the positioning pin.

[0072] Furthermore, an intermediate gasket 400 is provided between the sheet metal part 500 and the pressure sleeve body 200.

[0073] Example 3:

[0074] The difference between this embodiment 3 and embodiment 2 is that a compression spring 320 is provided between the fixed seat 700 and the pressure sleeve body 200.

[0075] In the description of this specification, references to terms such as "example," "embodiment," or "some embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0076] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. An expansion tube structure, characterized in that, It includes an expansion head body and a pressure sleeve body, wherein the pressure sleeve body is sleeved on the expansion head body and the pressure sleeve body can reciprocate along the expansion head body; A clamping assembly is provided between the expansion head body and the pressure sleeve body. The clamping assembly is used to drive the pressure sleeve body to move on the expansion head body so that the end of the pressure sleeve body extends beyond the end of the expansion head body.

2. The tube expansion structure according to claim 1, characterized in that, The clamping assembly is a sealed chamber disposed between the expansion head body and the pressure sleeve body.

3. The tube expansion structure according to claim 2, characterized in that, A first sealing ring is provided on the outer wall of the expansion head body, and a second sealing ring is provided on the inner wall of the pressure sleeve tube. The outer diameter of the first sealing ring is adapted to the inner diameter of the pressure sleeve tube, and the inner diameter of the second sealing ring is adapted to the outer wall of the expansion head body, so as to form the sealing chamber between the first sealing ring and the second sealing ring.

4. The tube expansion structure according to claim 3, characterized in that, The expansion head body is provided with a first main body section and a second main body section, wherein the first main body section is located on the side away from the first end of the expansion head body; The first sealing ring is disposed on the first main body segment, and the second sealing ring is fitted with the second main body segment.

5. The tube expansion structure according to claim 4, characterized in that, The diameter of the first main body segment is smaller than the diameter of the second main body segment.

6. The tube expansion structure according to any one of claims 1-5, characterized in that, The clamping assembly includes a clamping spring, and a fixed seat is provided at the second end of the expansion head body away from the pressure sleeve body. The clamping spring is disposed between the fixed seat and the pressure sleeve body.

7. The tube expansion structure according to any one of claims 1-5, characterized in that, A limiting boss is provided on the inner wall of the compression sleeve. The limiting boss is located on the moving path of the expansion head body and is located on the side away from the first end of the expansion head body.

8. The tube expansion structure according to claim 6, characterized in that, The fixed base, the expansion head body, and the pressure sleeve body are concentrically assembled.

9. A tube expansion device, characterized in that, Includes the tube expansion structure as described in any one of claims 1-8.

10. The tube expansion device according to claim 9, characterized in that, It also includes a worktable, with the expansion head body being arranged perpendicularly to the worktable; The tube connector to be expanded is mounted on a sheet metal part, which is mounted on the worktable. The worktable is provided with a positioning pin, and the tube connector to be expanded is positioned by the positioning pin.

11. The tube expansion device according to claim 10, characterized in that, An intermediate gasket is also provided between the sheet metal part and the pressure sleeve body.

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