Seamless welding support device for PFA (Polyfluoroalkoxy) pipe

Abstract

The utility model belongs to the technical field of seamless welding of PFA pipes, and particularly relates to a seamless welding supporting device for a PFA pipe. The seamless welding supporting device for the PFA pipe comprises an air bag, the axial tensioning assembly is arranged in the air bag; wherein the two ends of the axial tensioning assembly are fixedly connected with the two ends of the air bag. According to the seamless welding supporting device for the PFA pipe, the axial tensioning assembly is arranged in the air bag, so that axial expansion of the air bag is limited, and the situations of pipe deformation, inconsistent sizes and the like are reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to PFA pipe seamless welding technical field, specifically related to a kind of PFA pipe seamless welding support device. BACKGROUND

[0002] In the seamless welding process of PFA pipe, PFA pipe collapses inward when heated, resulting in insufficient roundness of the welded part, and the contact pressure during welding is also uneven. Therefore, in the seamless welding of PFA pipe, support is needed inside the pipe by air bag. Specifically, during welding, first align the end portions of the two pipes to be welded in the heating device, then insert the air bag into the pipe to form an internal support, thereby cooperating with the inner wall of the heating device to constrain the radial deformation of the pipe, and finally weld the welded part by heating device. The welded part of the welded PFA pipe has no fusion marks and welding scars.

[0003] The conventional air bag is limited by the inner wall of the PFA pipe, and the air bag will expand axially (i.e. along the length direction of the pipe) during inflation. In addition, the collapse of the PFA pipe under heat will also squeeze the air bag, causing the air bag to expand axially, resulting in insufficient or uneven radial support provided by the air bag, and thus leading to inconsistent pipe sizes and pipe deformation after welding. SUMMARY

[0004] The utility model aims to provide a kind of PFA pipe seamless welding support device, to solve the technical problem that the air bag inflation is axially expanded and leads to poor welding quality.

[0005] The present application provides a kind of PFA pipe seamless welding support device. The PFA pipe seamless welding support device comprises:

[0006] an air bag;

[0007] an axial tensioning assembly arranged inside the air bag; wherein

[0008] the two ends of the axial tensioning assembly are fixedly connected to the two ends of the air bag.

[0009] In an embodiment of the present application, the air bag includes a head portion and a tail portion at both ends, and a working portion in the middle;

[0010] the inner side of the head portion is provided with a gas nozzle connector;

[0011] one end of the axial tensioning assembly is fixed in the gas nozzle connector, and the other end is fixed to the tail portion of the air bag.

[0012] In an embodiment of the present application, one end of the gas nozzle connector is located outside the air bag for connecting a gas nozzle;

[0013] the other end of the gas nozzle connector is located inside the air bag for fixing the axial tensioning assembly.

[0014] In one embodiment of this application, an air passage is provided inside the air nozzle connector, and a stepped portion is provided on the inner wall of the end of the air passage located inside the airbag;

[0015] The axial tensioning assembly includes a tensioning member and a retaining ring located at the front end of the tensioning member;

[0016] The tensioning member is inserted into the air passage, and the retaining ring is engaged on the inner side of the step.

[0017] In one embodiment of this application, a first annular groove is provided on the outer periphery of the air nozzle connector;

[0018] The inner wall of the head of the airbag is provided with an annular protrusion for engaging with the first annular groove.

[0019] In one embodiment of this application, the outer periphery of the head of the airbag is provided with a front end cover;

[0020] The outer periphery of the air nozzle connector is provided with a second annular groove;

[0021] The front end of the front cover is engaged in the second annular groove.

[0022] In one embodiment of this application, the tail portion of the airbag is provided with a rear end cover;

[0023] The axial tensioning assembly includes a tensioning member and a fixing post located at the rear end of the tensioning member;

[0024] One end of the fixing post is fixedly connected to the tensioning member, and the other end passes through the tail of the airbag, with the exposed part fixedly connected to the rear end cover.

[0025] In one embodiment of this application, the fixing post is threadedly engaged with the rear end cover.

[0026] In one embodiment of this application, the portion of the fixing post located inside the tail of the airbag is provided with an enlarged diameter portion.

[0027] In one embodiment of this application, the interior of the working part is provided with several reinforcing ribs.

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

[0029] Unlike existing technologies, this application provides a seamless welding support device for PFA pipes. This seamless welding support device for PFA pipes includes: an air bladder; and an axial tensioning assembly disposed inside the air bladder; wherein the two ends of the axial tensioning assembly are fixedly connected to the two ends of the air bladder. This utility model's seamless welding support device for PFA pipes, by setting the axial tensioning assembly inside the air bladder, restricts the axial expansion of the air bladder, reducing pipe deformation and dimensional inconsistencies.

[0030] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0031] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of a preferred embodiment of the PFA pipe seamless welding support device of this utility model;

[0034] Figure 2 This is a cross-sectional view of a preferred embodiment of the PFA pipe seamless welding support device of this utility model;

[0035] Figure 3 yes Figure 2 Enlarged view of a portion of the image;

[0036] Figure 4 This is a cross-sectional view of an airbag according to a preferred embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of an axial tensioning assembly according to a preferred embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram of a preferred embodiment of the air nozzle connector and air nozzle of the present invention.

[0039] In the picture:

[0040] Airbag 1, head 11, annular protrusion 111, tail 12, working part 13, reinforcing rib 131, axial tensioning assembly 2, tensioning member 21, fixing ring 22, fixing post 23, diameter expansion part 231, air nozzle connector 3, air passage 31, step part 32, air nozzle 4, first annular groove 33, second annular groove 34, front end cover 5, rear end cover 6. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0042] This application provides a seamless welding support device for PFA pipes, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, in the following embodiments, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0043] See Figure 1 and Figure 2 In one embodiment, the PFA tube seamless welding support device includes: an airbag 1; and an axial tensioning assembly 2 disposed inside the airbag 1; wherein the two ends of the axial tensioning assembly 2 are fixedly connected to the two ends of the airbag 1.

[0044] In this embodiment, by providing an axial tensioning component 2 inside the airbag 1 to tension both ends of the airbag 1, the axial expansion of the airbag 1 during inflation can be restricted.

[0045] See Figure 2 and Figure 3 Specifically, the airbag 1 includes a head 11 and a tail 12 located at both ends, and a working part 13 located in the middle; an air nozzle connector 3 is provided on the inner side of the head 11; one end of the axial tensioning assembly 2 is fixed in the air nozzle connector 3, and the other end is fixed in the tail 12 of the airbag 1.

[0046] See Figure 4 In this embodiment, the head 11 and tail 12 of the airbag 1 can be used to assemble other components, and the working part 13 is the main expansion area of ​​the airbag 1, used to support the inner wall of the PFA tube to be welded. Optionally, the working part 13 is provided with several reinforcing ribs 131 inside, which can make the supporting force provided by the working part 13 more stable.

[0047] Furthermore, one end of the air nozzle connector 3 is located outside the airbag 1 and is used to connect the air nozzle 4; the other end of the air nozzle connector 3 is located inside the airbag 1 and is used to fix the axial tensioning assembly 2.

[0048] Optionally, the air nozzle 4 can be a miniature pagoda PT quick-connect fitting, which can be threaded with the air nozzle fitting 3.

[0049] As an optional embodiment for the axial tensioning assembly 2 to mate with the air nozzle connector 3, see [link to relevant documentation]. Figure 2 , Figure 3 and Figure 5 The air nozzle connector 3 is provided with an air passage 31 inside, and the inner wall of the end of the air passage 31 located inside the airbag 1 is provided with a stepped portion 32; the axial tensioning assembly 2 includes a tensioning member 21 and a fixing ring 22 located at the front end of the tensioning member 21; the tensioning member 21 passes through the air passage 31, and the fixing ring 22 is engaged inside the stepped portion 32.

[0050] Optionally, during assembly, the tensioning member 21 can be inserted into the air passage 31 first, and then the retaining ring 22 can be fixed onto the tensioning member 21. The tensioning member 21 is connected to the air nozzle connector 3 through the cooperation between the retaining ring 22 and the step portion 32. It is understood that the cooperation between the retaining ring 22 and the step portion 32 is not a sealing fit, so it will not block the air passage 31. During inflation, gas can enter the air passage 31 from the air nozzle 4 and then enter the airbag 1.

[0051] See Figure 3 and Figure 6 As a method for fixing the air nozzle connector 3 to the head 11 of the airbag 1, the outer periphery of the air nozzle connector 3 is provided with a first annular groove 33; the inner wall of the head 11 of the airbag 1 is provided with an annular protrusion 111 for engaging with the first annular groove 33. During installation, the air nozzle connector 3 can be inserted along the through hole of the head 11 until the annular protrusion 111 engages with the first annular groove 33, thus completing the fixing of the air nozzle connector 3 to the head 11 of the airbag 1.

[0052] Furthermore, a front cover 5 is provided on the outer periphery of the head 11 of the airbag 1; a second annular groove 34 is provided on the outer periphery of the air nozzle connector 3; the front end of the front cover 5 is snapped into the second annular groove 34. The front cover 5 may be made of aluminum alloy, and its covering on the outer periphery of the head 11 can further secure the fixed connection between the air nozzle connector 3 and the airbag 1.

[0053] Furthermore, as a preferred method of fixing the axial tensioning assembly 2 to the tail 12 of the airbag 1, see [reference needed]. Figure 2 and Figure 5 The airbag 1 has a rear end cover 6 covering the outer periphery of its tail 12; the axial tensioning assembly 2 includes a tensioning member 21 and a fixing post 23 located at the rear end of the tensioning member 21; one end of the fixing post 23 is fixedly connected to the tensioning member 21, and the other end passes through the tail 12 of the airbag 1 and the exposed part is fixedly connected to the rear end cover 6.

[0054] Optionally, the fixing post 23 is threadedly engaged with the rear end cover 6.

[0055] During assembly, the rear end of the fixing post 23 can be pushed out from the tail 12 first, and then the rear end cover 6 can be gradually tightened onto the rear end of the fixing post 23.

[0056] In this embodiment, see Figure 5 Preferably, the portion of the fixing post 23 located inside the tail 12 of the airbag 1 is provided with an enlarged diameter portion 231. The outer periphery of the enlarged diameter portion 231 may be arc-shaped.

[0057] As the rear end cap 6 is gradually tightened onto the rear end of the fixing post 23, the enlarged diameter portion 231 is continuously inserted into the tail 12 of the airbag 1, which can effectively seal the tail 12.

[0058] In this embodiment, as an optional implementation of the axial tensioning assembly 2, the tensioning member 21 can be a steel wire rope, and the fixing ring 22 can be a metal ring, which is pressed and fixed to the front end of the tensioning member 21 by hydraulic clamps; the front end of the fixing post 23 can be provided with an insertion groove for the rear end of the tensioning member 21 to be inserted. After the tensioning member 21 is inserted, it can also be pressed and fixed by hydraulic clamps, so that the tensioning member 21 is connected to the fixing post 23.

[0059] It should be noted that all the devices (parts whose specific structures are not specified) selected in this application are general standard parts or parts known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0060] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly, for example, they can be fixed connections, detachable connections, or integral connections.

[0061] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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 utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0062] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A seamless welding support device for PFA pipes, characterized in that, include: Airbag (1); An axial tensioning assembly (2) is disposed inside the airbag (1); in The two ends of the axial tensioning assembly (2) are fixedly connected to the two ends of the airbag (1).

2. The seamless welding support device for PFA pipes according to claim 1, characterized in that, The airbag (1) includes a head (11) and a tail (12) located at both ends, and a working part (13) located in the middle; An air nozzle connector (3) is provided on the inner side of the head (11); One end of the axial tensioning assembly (2) is fixed inside the air nozzle connector (3), and the other end is fixed to the tail (12) of the airbag (1).

3. The seamless welding support device for PFA pipes according to claim 2, characterized in that, One end of the air nozzle connector (3) is located outside the airbag (1) and is used to connect the air nozzle (4); The other end of the air nozzle connector (3) is located inside the airbag (1) and is used to fix the axial tensioning assembly (2).

4. The seamless welding support device for PFA pipes according to claim 2, characterized in that, The air nozzle connector (3) is provided with an air passage (31) inside, and the inner wall of the end of the air passage (31) located inside the airbag (1) is provided with a stepped part (32); The axial tensioning assembly (2) includes a tensioning member (21) and a retaining ring (22) located at the front end of the tensioning member (21); The tensioning member (21) is inserted into the air passage (31), and the fixing ring (22) is engaged on the inner side of the step portion (32).

5. The seamless welding support device for PFA pipes according to claim 4, characterized in that, The outer periphery of the air nozzle connector (3) is provided with a first annular groove (33); The inner wall of the head (11) of the airbag (1) is provided with an annular protrusion (111) for engaging in the first annular groove (33).

6. The seamless welding support device for PFA pipes according to claim 4, characterized in that, The outer periphery of the head (11) of the airbag (1) is covered with a front end cover (5); The outer periphery of the air nozzle connector (3) is provided with a second annular groove (34); The front end of the front cover (5) is engaged in the second annular groove (34).

7. The seamless welding support device for PFA pipes according to claim 2, characterized in that, The tail (12) of the airbag (1) is covered with a rear end cover (6); The axial tensioning assembly (2) includes a tensioning member (21) and a fixing post (23) located at the rear end of the tensioning member (21); One end of the fixing post (23) is fixedly connected to the tensioner (21), and the other end is inserted through the tail (12) of the airbag (1) and the exposed part is fixedly connected to the rear cover (6).

8. The seamless welding support device for PFA pipes according to claim 7, characterized in that, The fixing post (23) is threadedly engaged with the rear end cover (6).

9. The seamless welding support device for PFA pipes according to claim 7, characterized in that, The portion of the fixing post (23) located inside the tail (12) of the airbag (1) is provided with an enlarged diameter portion (231).

10. The seamless welding support device for PFA pipes according to claim 2, characterized in that, The working part (13) is provided with several reinforcing ribs (131) inside.

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