Pipeline welding clamp

Abstract

The utility model provides a pipeline welding clamp which comprises a sleeve, a limiting piece, a pull rod and a supporting assembly. The limiting piece is arranged at the end, away from the pipeline welding position, of the sleeve and used for being in limiting fit with the pipeline. One end of the pull rod is inserted into the sleeve; the supporting assembly comprises a connecting rod and a supporting piece, the two ends of the connecting rod are rotationally connected with the end, close to the pipeline welding position, of the pull rod and the supporting piece correspondingly so as to drive the supporting piece to move in the direction close to and away from the pipeline welding position through the connecting rod when the pull rod moves, and the supporting piece is used for abutting against the inner side of the pipeline welding position. The pipeline welding clamp is inserted into a pipeline, the supporting piece moves to the pipeline welding position of the pipeline, then the limiting piece and the pipeline are in limiting fit, then the pull rod is pulled, the pull rod drives the supporting piece to move and unfold through the connecting rod, and the supporting piece moves outwards and abuts against the pipeline welding position. Therefore, the supporting piece can completely support the welding position of the pipeline.

Description

TECHNICAL FIELD

[0001] The embodiment of the utility model relates to the technical field of welding equipment, in particular to a pipeline welding fixture. BACKGROUND

[0002] Pipeline welding refers to the process of connecting two or more pipeline components together by heating, and the heat source used in the welding process can be flame, electric arc or laser, etc.

[0003] At present, when welding a pipeline, external supporting clamps are generally used for clamping and positioning between two pipeline sections, but for soft pipelines, the external supporting clamping operation has high requirements, and improper operation can easily deform the pipeline connection. At present, there are also internal supporting clamps, but they are only used to support the pipeline from the inside, and it is difficult to align the welding of the pipeline, and the operation mode of the existing internal supporting clamps is relatively troublesome and the structure is relatively complex. UTILITY MODEL CONTENT

[0004] The purpose of the embodiment of the utility model is to provide a pipeline welding fixture, aiming at solving the problems of the existing internal supporting clamps.

[0005] To solve the above technical problems, the embodiment of the utility model provides a pipeline welding fixture for pipeline welding, which comprises:

[0006] A sleeve, one end of the sleeve is used for inserting into the pipeline and is close to the pipeline welding position of the pipeline;

[0007] A limiting piece, the limiting piece is arranged at one end of the sleeve away from the pipeline welding position, and the limiting piece is used for limiting cooperation with the pipeline to limit the movement of the sleeve relative to the pipeline;

[0008] A pull rod, one end of the pull rod is inserted into the sleeve, and the pull rod is arranged to be movable along the axial direction of the sleeve relative to the sleeve;

[0009] A supporting assembly, the supporting assembly comprises a connecting rod and a supporting piece, two ends of the connecting rod are rotatably connected to one end of the pull rod close to the pipeline welding position and the supporting piece, so that the supporting piece is driven by the connecting rod to move towards the pipeline welding position or away from the pipeline welding position when the pull rod moves, and the supporting piece is used for abutting to the inner side of the pipeline welding position.

[0010] Preferably, the limiting piece is arranged on the sleeve in a movable and adjustable manner along the axial direction of the sleeve.

[0011] Preferably, a threaded hole is formed on the limiting piece, and the sleeve passes through the limiting piece from the threaded hole at an end of the sleeve away from the pipe welding part, and an external thread is arranged on an outer circumferential side of the end of the sleeve away from the support assembly and threadedly matched with the threaded hole.

[0012] Preferably, the limiting piece is a limiting disc, and the limiting piece is arranged at an end of the sleeve located outside the pipe, and the limiting piece is used for abutting against an end surface of the pipe.

[0013] Preferably, an insertion edge is protruded on a surface of the limiting piece close to the support assembly, and the insertion edge is used for being inserted into the pipe.

[0014] Preferably, the end of the pull rod away from the support assembly is located outside the sleeve and is provided with a limiting nut, and an external thread is arranged on the end of the pull rod away from the support assembly and threadedly matched with the limiting nut, so that the pull rod is limited in the direction of being inserted into the sleeve when the limiting nut abuts against an end surface of the sleeve away from the support assembly.

[0015] Preferably, a sliding block is arranged on the end of the pull rod close to the support assembly, the sliding block is arranged in the sleeve in a manner capable of sliding along an axial direction of the sleeve, and the pull rod is rotationally connected with the connecting rod through the sliding block.

[0016] Preferably, a sliding groove extending along an axial direction of the sleeve is formed on the end of the sleeve close to the support assembly, a first connecting lug is arranged on the pull rod, the pull rod is rotationally connected with the connecting rod through the first connecting lug, part of the first connecting lug is located in the sliding groove, and the first connecting lug and the sliding groove form a sliding fit in the axial direction of the sleeve.

[0017] Preferably, a rotation limiting part is protruded on an outer circumferential side of the end of the sleeve close to the support assembly, and the rotation limiting part is located on a side of the connecting rod close to the sleeve in a rotation direction, so as to limit a rotation angle of the connecting rod through the rotation limiting part.

[0018] Preferably, a plurality of support assemblies are arranged along a circumferential direction of the pull rod.

[0019] Compared with the prior art, the utility model has the beneficial effects that:

[0020] The pipeline welding clamp is inserted into the pipeline, and the supporting piece is moved to the pipeline welding position of the pipeline, then the limiting piece is limited to cooperate with the pipeline, then the pull rod is pulled, the pull rod drives the supporting piece to move and expand through the connecting rod, the supporting piece moves outward and abuts against the pipeline welding position, so that the supporting piece can completely support the pipeline welding position, so that the pipeline welding clamp adopts the internal supporting structure, on the one hand, the pipeline is not deformed, on the other hand, the stability is better, the positioning is more accurate, the two pipeline sections of the pipeline can be aligned, thereby facilitating welding, and the problems that the existing external supporting clamp is difficult to operate and is easy to deform the pipeline are solved, and the problem that the existing internal supporting clamp is difficult to realize welding alignment is solved. BRIEF DESCRIPTION OF DRAWINGS

[0021] One or more embodiments are illustrated by way of example in the figures that form a part of this patent document, these example illustrations do not limit the embodiments, elements having the same reference numbers in the figures represent similar elements, unless otherwise specified, the figures in the drawings do not constitute a proportional limit.

[0022] Figure 1 It is a structure schematic view of the pipeline welding clamp in the embodiment of the utility model;

[0023] Figure 2 It is Figure 1 It is a partial enlarged view of A in the figure;

[0024] Figure 3 It is Figure 1 It is a partial enlarged view of B in the figure.

[0025] The utility model drawing mark explanation:

[0026] Pipeline welding clamp 100, sleeve 1, sliding groove 11, rotating limiting part 12, limiting piece 2, limiting disc 2a, threaded hole 21, plug-in edge 22, boss 23, pull rod 3, sliding block 31, first connecting lug 32, supporting assembly 4, connecting rod 41, supporting piece 42, second connecting lug 43, limiting nut 5, end cover 6, pipeline 200, pipeline welding position 210, pipeline section 220.

[0027] The realization, functional characteristics and advantages of the utility model will be further explained by combining with the embodiment and referring to the drawings. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort fall within the scope of the present application.

[0029] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0030] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0031] The present application provides a kind of pipeline welding fixture, the pipeline welding fixture can be used in the welding of workpiece such as pipeline, the pipeline welding fixture is used in the welding of pipeline as an example below, Figures 1 to 3 A preferred embodiment of the pipeline welding fixture provided by the present application is shown.

[0032] Please refer to Figures 1 to 3 In the present embodiment, the pipeline welding fixture 100 includes a sleeve 1, a limiting piece 2, a pull rod 3, and a support assembly 4. One end of the sleeve 1 is used to be inserted into the pipeline 200 and is close to the pipeline welding portion 210 of the pipeline 200. The limiting piece 2 is arranged at the end of the sleeve 1 away from the pipeline welding portion 210, and is used to form a limiting fit with the pipeline 200 to limit the movement of the sleeve 1 relative to the pipeline 200. One end of the pull rod 3 is inserted into the sleeve 1, and the pull rod 3 is arranged to be movable along the axial direction of the sleeve 1 relative to the sleeve 1. The support assembly 4 includes a connecting rod 41 and a support piece 42. The two ends of the connecting rod 41 are rotatably connected to one end of the pull rod 3 close to the pipeline welding portion 210 and the support piece 42, respectively. When the pull rod 3 moves, the support piece 42 is driven by the connecting rod 41 to move towards or away from the pipeline welding portion 210. The support piece 42 is used to abut the inner side of the pipeline welding portion 210.

[0033] Specifically, the pipe welding clamp 100 is a telescopic inner support clamp, which can be used in the welding of a pipe 200. The pipe 200 includes a plurality of pipe sections 220 connected in sequence, and a pipe welding joint 210 is formed between any two adjacent pipe sections 220. The axial direction of the pipe 200 is defined as the front-rear direction, and the end of the pipe 200 into which the pipe welding clamp 100 is inserted is the rear end of the pipe 200.

[0034] The sleeve 1 is arranged to extend along the front-rear direction. When the pipe welding clamp 100 is installed on the pipe 200, the front end of the sleeve 1 is inserted into the pipe 200 from the rear end of the pipe 200, and the front end of the sleeve 1 is close to the pipe welding joint 210 of the pipe 200, while the rear end of the sleeve 1 is located outside the pipe 200 and on the rear side of the pipe 200.

[0035] The limiting member 2 is arranged at the rear end of the sleeve 1. When the front end of the sleeve 1 is inserted into the pipe 200, the limiting member 2 is in limiting cooperation with the rear end of the pipe 200, so that the sleeve 1 is relatively fixed with the pipe 200.

[0036] The pull rod 3 is arranged to extend along the front-rear direction. The front end of the pull rod 3 is inserted into the sleeve 1, and the pull rod 3 is arranged to be movable forward and backward relative to the sleeve 1. The rear end of the pull rod 3 is located outside the sleeve 1 and on the rear side of the sleeve 1, so that the operator can push the pull rod 3 forward and pull the pull rod 3 backward through the rear end of the pull rod 3.

[0037] The support assembly 4 is located outside the sleeve 1. When the pipe welding clamp 100 is installed on the pipe 200, the support assembly 4 is located between the sleeve 1 and the inner pipe wall of the pipe 200, and the support assembly 4 is close to the pipe welding joint 210. The support assembly 4 includes a connecting rod 41 and a support member 42. One end of the connecting rod 41 is rotatably connected to the front end of the pull rod 3, and the end of the connecting rod 41 away from the pull rod 3 is rotatably connected to the support member 42. The surface of the support member 42 away from the connecting rod 41 is used to abut against the inner pipe wall of the pipe 200.

[0038] The sleeve 1, the pull rod 3 and the support assembly 4 form an umbrella structure, the pipeline welding clamp 100 is installed on the pipeline 200, when the operator pushes the pull rod 3 forward, the pull rod 3 drives the support 42 to move through the connecting rod 41 to fold, so that the support 42 moves to the pull rod 3 and closes. When the operator pulls the pull rod 3 backward, the pull rod 3 drives the support 42 to move through the connecting rod 41 to unfold, so that the support 42 moves to the pipeline welding position 210 and closes against the pipeline welding position 210, at this time, the support 42 can fully support the pipeline welding position 210, and the operator can leave the pipeline welding clamp 100, thereby reducing the labor cost. The pipeline welding clamp 100 can be suitable for manual welding or machine welding, and when the pipeline welding clamp 100 is used for machine welding, the pipeline welding clamp 100 does not affect the rotation of the pipeline 200. The pipeline welding clamp 100 is driven by a cylinder, an oil cylinder, a motor and the like, and is a pure mechanical structure without external wiring, and the structure is simpler. The specific shape of the support 42 can be set according to the actual situation, for example, the support 42 can be in the form of a sheet, a block, a strip or a plate.

[0039] The support assembly 4 is usually arranged along the circumference of the sleeve 1, so that the pipeline 200 can be better supported from the inside by the support assembly 4. Figures 1 to 3 In the embodiment, the support assembly 4 is provided with a plurality of supports along the circumference of the pull rod 3. Thus, one pull rod 3 can synchronously drive a plurality of support assemblies 4, which not only can better support the pipeline 200 by a plurality of support assemblies 4, but also the structure of the pipeline welding clamp 100 is relatively simple.

[0040] The pipeline welding clamp 100 of the utility model is inserted into the pipeline 200, and the support 42 is moved to the pipeline welding position 210 of the pipeline 200, then the limiting piece 2 is limitedly matched with the pipeline 200, then the pull rod 3 is pulled, the pull rod 3 drives the support 42 to move through the connecting rod 41 to unfold, the support 42 moves outward and abuts against the pipeline welding position 210, so that the support 42 can fully support the pipeline welding position 210, so that the pipeline welding clamp 100 adopts an internal support structure, which can not cause the pipeline 200 to deform, has better stability and more accurate positioning, can align the two pipeline sections 220 of the pipeline 200, thereby facilitating welding, solves the problems that the existing external support clamp has large operation difficulty and is easy to deform the pipeline 200, and solves the problem that the existing internal support clamp is difficult to realize welding alignment.

[0041] When the front end of the sleeve 1 is inserted into the pipeline 200, the sleeve 1 can be relatively fixed with the pipeline 200 through the limiting piece 2, and the specific shape and pattern of the limiting piece 2 can be set according to actual conditions. For example, the limiting piece 2 can be in the shape of a strip, a square block, or a disc, etc. In addition, the limiting piece 2 can be located inside the pipeline 200 to form a limiting fit with the pipeline 200, or the limiting piece 2 can be located outside the pipeline 200 to form a limiting fit with the pipeline 200.

[0042] Optionally, referring to Figures 1 to 3 In this embodiment, the limiting piece 2 is a limiting disc 2a, which is arranged at the end of the sleeve 1 outside the pipeline 200, and is used to abut against the end face of the pipeline 200.

[0043] Specifically, the limiting piece 2 is in the shape of a disc, and the disc-shaped limiting piece 2 is a limiting disc 2a. The diameter of the limiting disc 2a is greater than the inner diameter of the pipeline 200, and a through hole is arranged through the front and back of the middle part of the limiting disc 2a. The limiting disc 2a is arranged outside the rear end of the pipeline 200 through the through hole. When the front end of the sleeve 1 is inserted into the pipeline 200, the limiting disc 2a abuts against the rear side of the pipeline 200, and the front surface of the limiting disc 2a abuts against the rear end face of the pipeline 200. In this way, the limiting disc 2a can not only limit the sleeve 1 and the pipeline 200 in the front-rear direction, but also support the sleeve 1 in the radial direction of the pipeline 200. In the following, the limiting piece 2 will be taken as the limiting disc 2a as an example for introduction.

[0044] Further, referring to Figures 1 to 3 In this embodiment, the surface of the limiting piece 2 close to the support assembly 4 is convexly provided with a plug-in edge 22, which is used to be inserted into the pipeline 200.

[0045] Specifically, the front surface of the limiting piece 2 is convexly provided with a plug-in edge 22 forward. When the front end of the sleeve 1 is inserted into the pipeline 200, the plug-in edge 22 is inserted into the rear end of the pipeline 200, and the plug-in edge 22 abuts against the inner tube wall of the pipeline 200. In this way, through the abutting fit between the plug-in edge 22 and the inner tube wall of the pipeline 200, the sleeve 1 and the pipeline 200 can be limited in the radial direction of the pipeline 200, and the support effect of the limiting disc 2a on the sleeve 1 will also be better. The plug-in edge 22 is usually arranged in extension along the circumferential direction of the pipeline 200, for example, the plug-in edge 22 can be arranged in the shape of a whole or a large half of a circle.

[0046] Optionally, referring to Figures 1 to 3 In this embodiment, the limiting piece 2 is arranged on the sleeve 1 in a manner that can be adjusted in the axial direction of the sleeve 1.

[0047] Specifically, the limiting piece 2 is arranged on the sleeve 1 in a manner capable of being adjusted forwardly and backwardly, so that the installation position of the limiting piece 2 on the sleeve 1 can be adjusted forwardly and backwardly based on the distance between the pipe welding portion 210 and the rear end face of the pipe 200 in actual situation, which is beneficial to completely support the pipe welding portion 210 by the supporting piece 42, and improves the versatility of the pipe welding clamp 100.

[0048] There are various specific arrangement manners for realizing that the limiting piece 2 is arranged on the sleeve 1 in a manner capable of being adjusted forwardly and backwardly, for example, a clamping structure or a threaded connection structure arranged along the front-rear direction is arranged between the limiting piece 2 and the sleeve 1, so as to realize that the limiting piece 2 is arranged on the sleeve 1 in a manner capable of being adjusted forwardly and backwardly.

[0049] Optionally, referring to Figures 1 to 3 In the embodiment, a threaded hole 21 is formed in the limiting piece 2, the sleeve 1 passes through the limiting piece 2 from the threaded hole 21, and an outer thread is arranged on the outer circumferential side of the end of the sleeve 1 away from the supporting assembly 4 and threadedly matched with the threaded hole 21.

[0050] Specifically, as introduced above, the middle part of the limiting piece 2 is provided with a through hole penetrating the limiting piece 2 forwardly and backwardly, and an inner thread is arranged on the inner hole wall of the through hole to form the threaded hole 21. An outer thread is arranged on the outer circumferential side of the rear end of the sleeve 1 and threadedly matched with the threaded hole 21, so that the installation position of the limiting piece 2 on the sleeve 1 can be adjusted forwardly and backwardly by rotating the limiting piece 2.

[0051] Further, referring to Figures 1 to 3 In the embodiment, a boss 23 is protruded rearwardly on the rear surface of the limiting piece 2, and the threaded hole 21 is arranged on the boss 23. Arranging the threaded hole 21 on the boss 23 can strengthen the structural strength of the limiting piece 2 at the threaded hole 21.

[0052] The front end of the pull rod 3 is inserted into the sleeve 1, and in the process of moving the pull rod 3 forwardly and backwardly relative to the sleeve 1, the front end of the pull rod 3 can be located in the sleeve 1 at all times; or the front end of the pull rod 3 can protrude forwardly out of the sleeve 1. Optionally, referring to Figures 1 to 3 In the embodiment, an end cover 6 is arranged on the end of the sleeve 1 close to the supporting assembly 4.

[0053] Specifically, the front end of the sleeve 1 is provided with the end cover 6, the front end of the sleeve 1 is blocked by the end cover 6, so that the pull rod 3 can be actively limited from the front side by the end cover 6, the front end of the pull rod 3 is located in the sleeve 1 at all times, so as to avoid that the pull rod 3 is separated from the sleeve 1 from the front end of the sleeve 1, and below the process of moving the pull rod 3 forwardly and backwardly relative to the sleeve 1 will be taken as an example for introduction.

[0054] Optionally, referring to Figures 1 to 3In the embodiment, the pull rod 3 is provided with a sliding block 31 at one end close to the support assembly 4, the sliding block 31 is arranged in the sleeve 1 and can slide along the axial direction of the sleeve 1, and the pull rod 3 is rotationally connected with the connecting rod 41 through the sliding block 31.

[0055] Specifically, the diameter of the pull rod 3 is smaller than the inner diameter of the sleeve 1, so that the operator can pull the pull rod 3 more labor-saving. The front end of the pull rod 3 is provided with the sliding block 31, the shape and size of the sliding block 31 are generally matched with the shape and size of the sleeve 1, so that the sliding cooperation between the sliding block 31 and the sleeve 1 can guide the movement of the pull rod 3 in the front-rear direction. The following will be introduced by taking the rotationally connecting the connecting rod 41 with the pull rod 3 through the sliding block 31 as an example.

[0056] When the support 42 abuts against the pipe welding portion 210, the included angle between the connecting rod 41 and the sleeve 1 can be an acute angle, a right angle or an obtuse angle. Alternatively, please refer to Figures 1 to 3 In the embodiment, when the support 42 abuts against the pipe welding portion 210, the included angle between the connecting rod 41 and the sleeve 1 is an acute angle.

[0057] Alternatively, please refer to Figures 1 to 3 In the embodiment, the sleeve 1 is provided with a sliding groove 11 extending along the axial direction of the sleeve 1 at one end close to the support assembly 4, and the pull rod 3 or part of the connecting rod 41 extends into the sliding groove 11 and can slide in the front-rear direction of the sliding groove 11.

[0058] Specifically, the sleeve 1 is provided with the sliding groove 11 extending along the front-rear direction at the front end corresponding to the connecting rod 41, and the pull rod 3 or part of the connecting rod 41 extends into the sliding groove 11 and can slide in the front-rear direction of the sliding groove 11, so that the sliding groove 11 not only guides the movement of the pull rod 3 in the front-rear direction, but also limits the movement of the pull rod 3 in the circumferential direction of the sleeve 1.

[0059] Further, please refer to Figures 1 to 3 In the embodiment, the pull rod 3 is provided with a first connecting lug 32, the pull rod 3 is rotationally connected with the connecting rod 41 through the first connecting lug 32, part of the first connecting lug 32 is located in the sliding groove 11, and the first connecting lug 32 and the sliding groove 11 form a sliding cooperation in the axial direction of the sleeve 1.

[0060] Specifically, the sliding block 31 is provided with the first connecting lug 32 protruding from the circumferential side surface corresponding to the support assembly 4, the first connecting lug 32 is rotationally connected with the connecting rod 41, and the first connecting lug 32 also forms a sliding cooperation with the sliding groove 11 in the front-rear direction, so that the first connecting lug 32 not only facilitates the rotationally connecting the front end of the pull rod 3 with the connecting rod 41, but also facilitates guiding the movement of the pull rod 3 in the front-rear direction.

[0061] Alternatively, please refer to Figures 1 to 3In the embodiment, the support 42 is provided with a second connecting lug 43, and the support 42 is rotationally connected to the connecting rod 41 through the second connecting lug 43.

[0062] Specifically, the support 42 is provided with the second connecting lug 43 on a surface close to the sleeve 1, and the second connecting lug 43 is rotationally connected to an end of the connecting rod 41 away from the sleeve 1, so as to facilitate the rotational connection of the support 42 and the connecting rod 41.

[0063] Optionally, referring to Figures 1 to 3 In the embodiment, the sleeve 1 is provided with a rotation limiting part 12 on an outer circumferential side of an end close to the support assembly 4, and the rotation limiting part 12 is located on a side of the connecting rod 41 close to the sleeve 1 in the rotation direction, so as to limit the rotation angle of the connecting rod 41 through the rotation limiting part 12.

[0064] Specifically, the sleeve 1 is provided with the rotation limiting part 12 on an outer circumferential side of a front end, and the rotation limiting part 12 is located on a rear side of the sliding groove 11, so as to limit the rotation angle of the connecting rod 41 (i.e. the maximum unfolding angle or the minimum folding angle of the support assembly 4) through the rotation limiting part 12. For example, when the support 42 abuts against the pipe welding part 210, the rotation limiting part 12 abuts against a rear side of the connecting rod 41. The specific shape of the rotation limiting part 12 is not specially limited, for example, the rotation limiting part 12 can be provided in the shape of a bump, a boss or a protrusion, for example, in the embodiment, the rotation limiting part 12 is a limiting seat.

[0065] Optionally, referring to Figures 1 to 3 Figures 1 to 3 In the embodiment, an end of the pull rod 3 away from the support assembly 4 is located outside the sleeve 1 and is provided with a limiting nut 5, and the end of the pull rod 3 away from the support assembly 4 is provided with an external thread threadedly matched with the limiting nut 5, so as to limit the pull rod 3 in the direction of insertion of the pull rod 3 into the sleeve 1 when the limiting nut 5 abuts against an end face of the sleeve 1 away from the support assembly 4.

[0066] Specifically, the rear end of the pull rod 3 is located outside the sleeve 1, and the rear end of the pull rod 3 is provided with an external thread on a circumferential side, so as to be able to install the limiting nut 5 at the rear end of the pull rod 3. Thus, when the support 42 abuts against the pipe welding part 210, the limiting nut 5 is rotated, so as to make the limiting nut 5 abut against a rear end face of the sleeve 1, so that the pull rod 3 can be positionally fixed.

[0067] The pipe welding clamp 100 realizes the sliding of the sliding block 31 through the sleeve 1 and the pull rod 3, the connecting rod 41 located on the outer side of the sliding block 31 is matched with the rotation limiting part 12, when the pull rod 3 is pulled, the connecting rod 41 pushes and jacks the support 42 outward through limiting, so as to realize the inner support of the pipe 200, at the same time, through the cooperation of the limiting disc 2a, it is ensured that the sleeve 1 will not be inclined, and through the cooperation of the pull rod 3 and the limiting nut 5, it is ensured that the pull rod 3 can be positionally fixed.

[0068] After the pipe welding fixture 100 is inserted into the pipe 200 as a whole, the support 42 is moved to the pipe welding position 210, then the limiting disc 2a is rotated, the insertion edge 22 of the limiting disc 2a is inserted into the rear end of the pipe 200, then the pull rod 3 is pulled, the pull rod 3 drives the sliding block 31 to retreat, when the connecting rod 41 abuts against the rotating limiting part 12, the support 42 moves outward and abuts against the pipe welding position 210, at this time, the limiting nut 5 is rotated, the position of the pull rod 3 is fixed through the limiting nut 5, at this time, the support 42 completely supports the pipe welding position 210, and the operator can leave.

[0069] The above is only the preferred embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation, direct / indirect application in other related technical fields under the utility model concept of the utility model, and the contents of the utility model specification and drawings are included in the patent protection range of the utility model.

Claims

1. A pipe welding fixture for pipe welding, characterized by, The pipeline welding clamp comprises: a sleeve, one end of the sleeve being arranged to be inserted into the pipeline and close to the pipeline welding position of the pipeline; a limiting piece, the limiting piece being arranged at the end of the sleeve away from the pipeline welding position, the limiting piece being arranged to form a limiting fit with the pipeline to limit the movement of the sleeve relative to the pipeline; a pull rod, one end of the pull rod being inserted into the sleeve, the pull rod being arranged to be movable along the axial direction of the sleeve relative to the sleeve; a support assembly, the support assembly comprising a connecting rod and a support piece, two ends of the connecting rod being rotatably connected to one end of the pull rod close to the pipeline welding position and the support piece, respectively, the support piece being arranged to be moved by the connecting rod towards the pipeline welding position or away from the pipeline welding position when the pull rod is moved, the support piece being arranged to abut the inner side of the pipeline welding position.

2. The pipe welding fixture of claim 1, wherein, The limiting piece is arranged on the sleeve to be movable along the axial direction of the sleeve.

3. The pipe welding fixture of claim 2, wherein, A threaded hole is formed in the limiting piece, the end of the sleeve away from the pipeline welding position penetrating through the limiting piece from the threaded hole, an external thread being arranged on the outer circumferential surface of the end of the sleeve away from the support assembly to threadedly engage with the threaded hole.

4. The pipe welding fixture of claim 1, wherein, The limiting piece is a limiting disc, the limiting disc being arranged at the end of the sleeve outside the pipeline, the limiting disc being arranged to abut the end face of the pipeline.

5. The pipe welding fixture of claim 4, wherein, An insertion edge is arranged on the surface of the limiting piece close to the support assembly, the insertion edge being arranged to be inserted into the pipeline.

6. A pipe welding fixture according to any one of claims 1-5, characterized in that An end of the pull rod away from the support assembly is arranged outside the sleeve and provided with a limiting nut, an external thread being arranged on the end of the pull rod away from the support assembly to threadedly engage with the limiting nut, so that the pull rod is limited in the direction of being inserted into the sleeve when the limiting nut abuts the end face of the sleeve away from the support assembly.

7. A pipe welding fixture according to any one of claims 1-5, characterized in that A sliding block is arranged on the end of the pull rod close to the support assembly, the sliding block being arranged to be slidable along the axial direction of the sleeve, the pull rod being rotatably connected to the connecting rod through the sliding block.

8. The pipe welding fixture of any one of claims 1-5, wherein, A sliding groove extending along the axial direction of the sleeve is formed in the end of the sleeve close to the support assembly, a first connecting lug being arranged on the pull rod, the pull rod being rotatably connected to the connecting rod through the first connecting lug, part of the first connecting lug being arranged in the sliding groove, the first connecting lug and the sliding groove forming a sliding fit in the axial direction of the sleeve.

9. The pipe welding fixture of any one of claims 1-5, wherein, A rotation limiting part is arranged on the outer circumferential surface of the end of the sleeve close to the support assembly, the rotation limiting part being arranged on the side of the connecting rod close to the sleeve in the rotation direction to limit the rotation angle of the connecting rod through the rotation limiting part.

10. The pipe welding fixture of any one of claims 1-5, wherein, A plurality of support assemblies are arranged along the circumferential direction of the pull rod.

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