A cold-drawn steel pipe welding positioning fixture

Abstract

This invention belongs to the technical field of welding auxiliary devices, specifically relating to a welding positioning fixture for cold-drawn steel pipes. It includes a support mechanism, a pipe fixing mechanism, a combined positioning mechanism, and an automatic friction rotation mechanism. The support mechanism supports the entire fixture; the pipe fixing mechanism clamps and fixes the first pipe to be welded; the combined positioning mechanism connects and positions the second pipe to be welded with the first pipe clamped and fixed by the pipe fixing mechanism; after the first and second pipes are initially welded, when the pipe fixing mechanism releases the welded first pipe, the automatic friction rotation mechanism automatically drives the first pipe under its own weight, using friction to drive the welded first pipe to rotate automatically during the release process. This solves the problem of inaccurate positioning between the axes of the two pipes during welding, which leads to uneven welding and affects welding efficiency.

Description

Technical Field

[0001] This invention relates to the field of welding auxiliary device technology, specifically a welding positioning fixture for cold-drawn steel pipes. Background Technology

[0002] In steel pipe welding construction, it is often necessary to butt-weld two pipes. Existing pipe welding positioning fixtures usually include a clamping mechanism for fixing the original pipe and a combined installation positioning mechanism for centering and aligning the pipe to be welded with the original pipe and maintaining their relative positions.

[0003] Current welding positioning fixtures typically involve separately fixing the two pipes to be welded before alignment and welding. However, during the alignment and welding process, due to the significant weight of the steel pipes, the ends of the long, narrow pipes are prone to sagging and bending, making it impossible to ensure that the two ends of the pipes remain in the same axial position. This instability in the axial alignment between the two pipes requires multiple alignment adjustments and can easily result in the welded pipes not being straight, necessitating rework. Furthermore, if the two pipes are directly fixed before welding, the weld seam is easily obscured, making welding difficult and requiring multiple manual rotations. Therefore, welding efficiency is significantly affected. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of the embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] Therefore, the purpose of this invention is to provide a cold-drawn steel pipe welding positioning fixture to replace the traditional method of positioning and fixing steel pipes during welding, thereby avoiding the problem of inaccurate positioning between the axes of the two pipes during the welding process, which leads to unevenness after welding and affects welding efficiency.

[0006] To address the aforementioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution: A welding positioning fixture for cold-drawn steel pipes, comprising: A support mechanism is used to support the entire fixture and maintain its stability. A pipe fixing mechanism, which is mounted on the support mechanism and is used to clamp and fix the first pipe to be welded; A combined positioning mechanism is located on one side of the pipe fixing mechanism. When the combined positioning mechanism is working, it connects and positions the second pipe to be welded with the first pipe that has been clamped and fixed by the pipe fixing mechanism. An automatic friction rotation mechanism is installed on one side of the pipe fixing mechanism. After the first and second pipes are initially welded together, when the pipe fixing mechanism loosens the welded first pipe, the automatic friction rotation mechanism is automatically driven by the weight of the first pipe to rotate automatically during the loosening process using friction.

[0007] In a preferred embodiment of the cold-drawn steel pipe welding positioning fixture of the present invention, the support mechanism includes a support frame and a balance base located at the bottom of the support frame.

[0008] As a preferred embodiment of the cold-drawn steel pipe welding positioning fixture of the present invention, the pipe fixing mechanism includes a fixing frame connected to the support frame and having a connecting lug at the top, a top limiting component mounted on the fixing frame, and a bottom clamping support component mounted on the fixing frame.

[0009] As a preferred embodiment of the cold-drawn steel pipe welding positioning fixture of the present invention, the top limiting component includes a fixing plate detachably mounted on the fixing frame, limiting blocks located on both sides of the fixing plate and having cross openings at the bottom, and rubber blocks mounted on the cross openings at the bottom of the limiting blocks.

[0010] As a preferred embodiment of the cold-drawn steel pipe welding positioning fixture of the present invention, the bottom clamping support assembly includes a mounting frame mounted on the fixed frame, grippers movably mounted on both sides of the mounting frame, an adjusting rod movably mounted on the mounting frame, and a transmission component with one end movably connected to the mounting frame and the other end pulsatorically connected to the two grippers.

[0011] As a preferred embodiment of the cold-drawn steel pipe welding positioning fixture of the present invention, the side wall of the mounting frame is provided with a straight slide groove and a plurality of arc-shaped slide grooves. The transmission component includes a first connecting shaft that is slidably connected to the linear slide groove, and two second connecting shafts that are hinged to the first connecting shaft via connecting rods. The middle part of the gripper has a third connecting shaft that is slidably connected to the arc-shaped groove, and the end of the gripper is rotatably connected to the second connecting shaft. The end of the adjusting rod near the mounting bracket has a limiting groove corresponding to both ends of the first connecting shaft.

[0012] As a preferred embodiment of the cold-drawn steel pipe welding positioning fixture of the present invention, the combined positioning mechanism includes a first assembly, a second assembly whose one end is movably connected to one end of the first assembly, a third assembly whose one end is movably connected to the other end of the second assembly, and an adjustment component whose one end is drively connected to the other end of the third assembly and whose other end is drively connected to the end of the first assembly away from the second assembly.

[0013] As a preferred embodiment of the cold-drawn steel pipe welding positioning fixture of the present invention, the first assembly includes two parallel arc-shaped blocks and a long strip positioning plate located inside the arc-shaped blocks, wherein the second assembly and the third assembly have the same structure as the first assembly.

[0014] As a preferred embodiment of the cold-drawn steel pipe welding positioning fixture of the present invention, the side wall of the arc-shaped block has a first connecting groove, and one end of the arc-shaped block of the third assembly has a second connecting groove. The adjustment assembly includes a first rotating rod located in the second connecting groove, a second rotating rod located in the first connecting groove, a slide rod with one end rotatably connected to the first rotating rod and the other end slidably connected to the second rotating rod, and a handle installed on the side wall of the first rotating rod.

[0015] As a preferred embodiment of the cold-drawn steel pipe welding positioning fixture of the present invention, the automatic friction rotation mechanism includes a connecting block fixedly installed on the side wall of the limiting block and having a connecting frame on the side wall, an arc-shaped trigger frame rotatably connected to the connecting block, and a friction drive roller rotatably installed on the connecting frame and having its outer surface in contact with the outer side wall of the first pipe. The top of the arc-shaped trigger frame has a drive shaft rotatably connected to the connecting hole of the connecting block. A torsion spring with its other end connected to the inner wall of the connecting hole is sleeved on the drive shaft. The side wall of the friction drive roller has a connecting member that is drively connected to the drive shaft.

[0016] Compared with the prior art, the present invention has the following advantages: This cold-drawn steel pipe welding positioning fixture clamps and fixes the first pipe to be welded through a pipe fixing mechanism, and then connects and positions the second pipe to be welded with the clamped first pipe through a combination positioning mechanism, thereby positioning and assembling the two pipes to be welded together. This ensures that the axes of the two pipes remain consistent during the welding process. Furthermore, during the process of releasing the pipes after the first weld, the automatic friction rotation mechanism drives the pipes to rotate synchronously by converting the friction force from the pipes' gravity, without the need for additional power. This facilitates the re-exposing of parts that were previously obscured during the combination positioning, thus making it easier to perform repair welding. This replaces the traditional method of positioning and fixing steel pipes during welding, avoiding the problem of inaccurate positioning between the axes of the two pipes during the welding process, which leads to unevenness after welding and affects welding efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the structure of a cold-drawn steel pipe welding positioning fixture according to the present invention; Figure 2 This is a structural exploded view of a cold-drawn steel pipe welding positioning fixture according to the present invention; Figure 3 This is a structural exploded view of the pipe fixing mechanism of a cold-drawn steel pipe welding positioning fixture according to the present invention; Figure 4 This is a structural exploded view of the bottom support clamping assembly of a cold-drawn steel pipe welding positioning fixture according to the present invention; Figure 5 This is a schematic diagram of the combined positioning mechanism of a cold-drawn steel pipe welding positioning fixture of the present invention, which connects and positions two pipes. Figure 6 This is a structural exploded view of the combined positioning mechanism of a cold-drawn steel pipe welding positioning fixture according to the present invention; Figure 7 This is a schematic diagram of the automatic friction rotation mechanism of a cold-drawn steel pipe welding positioning fixture according to the present invention.

[0018] In the diagram: 100, Support mechanism; 110, Support frame; 120, Balance base; 200, Pipe fixing mechanism; 210, Fixing frame; 210a, Connecting ear; 220, Top limiting component; 220a, Fixing plate; 220b, Limiting block; 220c, Rubber block; 230, Bottom clamping support component; 230a, Mounting frame; 230a-1, Linear slide; 230a-2, Arc slide; 230b, Gripper; 230c, Adjusting rod; 230d, Transmission component; 230d-1, First connecting shaft; 230d2, Second connecting shaft; 300, Combined positioning mechanism; 3 10. First assembly; 310a. Arc-shaped block; 310a-1. First connecting groove; 310b. Long strip positioning plate; 320. Second assembly; 330. Third assembly; 330a. Second connecting groove; 340. Adjustment component; 340a. First rotating rod; 340b. Second rotating rod; 340c. Slide rod; 340d. Handle; 400. Automatic friction rotation mechanism; 410. Connecting block; 410a. Connecting frame; 420. Arc-shaped trigger frame; 420a. Drive shaft; 430. Friction drive roller; 430a. Connector; 500. First pipe; 600. Second pipe. Detailed Implementation

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0022] This invention provides a cold-drawn steel pipe welding positioning fixture, which replaces the traditional method of positioning and fixing steel pipes during welding. It avoids the problem of inaccurate positioning between the axes of the two pipes during the welding process, which leads to unevenness after welding and affects welding efficiency.

[0023] Figures 1-7 The diagram shown is a structural schematic of a cold-drawn steel pipe welding positioning fixture according to the present invention. Please refer to [link / reference]. Figures 1-7 This paper provides a detailed introduction to the welding positioning fixture for this type of cold-drawn steel pipe.

[0024] Example 1 refer to Figures 1-7This invention discloses a cold-drawn steel pipe welding positioning fixture, the main body of which includes a support mechanism 100, a pipe fixing mechanism 200, a combined positioning mechanism 300, and an automatic friction rotation mechanism 400.

[0025] refer to Figures 1-2 The support mechanism 100 is used to support the entire fixture and maintain its stability, thereby making the entire fixture and pipeline more stable and reliable during the welding process. refer to Figures 1-3 The pipe fixing mechanism 200 is used to clamp and fix the first pipe 500 to be welded. The pipe fixing mechanism 200 is installed on the support mechanism 100 and is used to clamp and fix the first pipe 500 to be welded, thereby facilitating the positioning of the second pipe 600 to be welded and facilitating subsequent welding work. refer to Figures 1-6 The combined positioning mechanism 300 is used to combine and position the first pipe 500 and the second pipe 600 to be welded, thereby fixing the first pipe 500 and the second pipe 600 as a whole. The combined positioning mechanism 300 is located on one side of the pipe fixing mechanism 200. When the combined positioning mechanism 300 is working, it connects and positions the second pipe 600 to be welded with the first pipe 500 after it has been clamped and fixed by the pipe fixing mechanism 200. After the combined positioning mechanism 300 connects and positions the second pipe 600 to be welded with the first pipe 500 after it has been clamped and fixed, the first pipe 500 and the second pipe 600 become a fixed body, which facilitates the stability of the two with the same axis. refer to Figures 1-7 The automatic friction rotation mechanism 400 is used to drive the pipe to rotate synchronously by converting the pipe's own weight into frictional force during the process of the pipe fixing mechanism 200 loosening the pipe. The automatic friction rotation mechanism 400 is installed on one side of the pipe fixing mechanism 200. After the first pipe 500 and the second pipe 600 are initially welded, when the pipe fixing mechanism 200 loosens the welded first pipe 500, the automatic friction rotation mechanism 400 is automatically driven to work under the weight of the first pipe 500. The frictional force drives the welded first pipe 500 to rotate automatically during the loosening process. Thus, when the pipe after one welding is slowly loosened, the pipe slowly descends under its own weight, thereby driving the automatic friction rotation mechanism 400 to work. The frictional force drives the pipe to rotate synchronously during the slight descent, thereby exposing the welded parts that were previously covered by the combined positioning mechanism 300, thus facilitating the completion of the repair welding.

[0026] In this embodiment, the specific usage process is as follows: First, the first pipe 500 to be welded is carefully fixed by the pipe fixing mechanism 200. Then, the second pipe 600 to be welded is connected and positioned with the clamped and fixed first pipe 500 by the combination positioning mechanism 300, so that the first pipe 500 and the second pipe 600 become the same fixed body. At the same time, the axes of the two are consistent and not easy to misalign, thereby improving the stability of welding. After the first weld is completed, the welded pipe is slightly loosened by the pipe fixing mechanism 200. At this time, the pipe will fall slightly under its own weight. Then, the automatic friction rotation mechanism 400 converts the weight of the pipe into friction force, causing the pipe to rotate synchronously, thereby exposing the weld that was previously covered by the combination positioning mechanism 300. Then, the pipe is clamped and fixed again, and the part that was not welded in the first weld is repaired. The welding quality is guaranteed and the welding efficiency is high throughout the process.

[0027] Example 2 Based on Example 1, and referring to Figures 1-2 The support mechanism 100 includes a support frame 110 and a balance base 120 located at the bottom of the support frame 110. The support frame 110 is used to facilitate the installation of the fixing frame 210. The balance base 120 is used to maintain the stability of the entire fixture. The balance base 120 includes multiple linearly connected load-bearing blocks. At the same time, the number of load-bearing blocks on both sides is the same, thereby increasing the balance stability at both ends as the welded pipe gradually lengthens.

[0028] Example 3 Based on Example 2, and referring to Figures 1-4 The pipe fixing mechanism 200 includes a fixing frame 210 connected to the support frame 110 and having a connecting ear 210a at the top, a top limiting component 220 mounted on the fixing frame 210, and a bottom clamping support component 230 mounted on the fixing frame 210. The fixing frame 210 is used to install the top limiting component 220 and the bottom clamping support component 230. The connecting ear 210a is used to facilitate hoisting when the entire fixture needs to be transferred. The top limiting component 220 is used to limit the top sides of the first pipe 500 to be welded. The bottom clamping mechanism component is used to clamp and support the first pipe 500.

[0029] In the embodiment, reference Figures 3-4The top limiting assembly 220 includes a fixing plate 220a detachably mounted on the fixing frame 210, limiting blocks 220b located on both sides of the fixing plate 220a and having cross openings at the bottom, and rubber blocks 220c mounted on the cross openings at the bottom of the limiting blocks 220b. The fixing plate 220a is used to install the limiting blocks 220b, the cross openings at the bottom of the limiting blocks 220b are used to limit the top sides of the first pipe 500, and the rubber blocks 220c are used to prevent friction scratches between the first pipe 500 and the limiting blocks 220b.

[0030] In the embodiment, reference Figures 3-4 The bottom clamping support assembly 230 includes a mounting frame 230a mounted on the fixed frame 210, grippers 230b movably mounted on both sides of the mounting frame 230a, an adjusting rod 230c movably mounted on the mounting frame 230a, and a transmission component 230d with one end movably connected to the mounting frame 230a and the other end pulsatorically connected to the two grippers 230b. The mounting frame 230a is used to movably mount the grippers 230b, the adjusting rod 230c, and the transmission component 230d. The two grippers 230b are used to clamp or release the first pipe 500 when they move closer or further apart. The adjusting rod 230c is used to drive the transmission component 230d to rotate when it rotates. The transmission component 230d is used to drive the two grippers 230b to move closer or further apart when the adjusting rod 230c rotates.

[0031] In the embodiment, reference Figure 4 The side wall of the mounting bracket 230a is provided with a straight slide groove 230a-1 and a plurality of arc slide grooves 230a-2. The straight slide groove 230a-1 is used to slide the first connecting shaft 230d-1, and the arc slide groove 230a-2 is used to slide the third connecting shaft. refer to Figure 4 The transmission component 230d includes a first connecting shaft 230d-1 slidably connected to the linear slide groove 230a-1, and two second connecting shafts 230d2 hinged to the first connecting shaft 230d-1 via connecting rods. The first connecting shaft 230d-1 is used to drive the second connecting shafts 230d2 to move when it moves up and down in the linear slide groove 230a-1. The second connecting shafts 230d2 are used to drive the two grippers 230b to move closer or further apart when they move. The middle part of the gripper 230b has a third connecting shaft that is slidably connected to the arc-shaped sliding groove 230a-2, and the end of the gripper 230b is rotatably connected to the second connecting shaft 230d2; The adjusting rod 230c has a limiting groove at one end near the mounting bracket 230a that corresponds to the two ends of the first connecting shaft 230d-1, which is used to drive the first connecting shaft 230d-1 to move within the linear slide groove 230a-1 when the adjusting rod 230c is rotated.

[0032] In this embodiment, the specific workflow is as follows: When fixing the first pipe 500, the first pipe 500 is first lifted to the bottom of the gripper 230b, and then the adjusting rod 230c is rotated so that the first connecting shaft 230d-1 moves upward in the linear slide groove 230a-1. Thus, driven by the movement of the second connecting shaft 230d2, the two grippers 230b are moved closer to each other and lifted upward until the top two sides of the first pipe 500 contact the rubber block 220c in the cross opening at the bottom of the limiting block 220b, thereby completing the clamping and fixing of the first pipe 500. In addition, the bottom is clamped and supported by the clamping jaws 230b and the cross opening is limited, which makes it easy to clamp and fix pipes of different sizes. This avoids the situation where the clamping is not tight enough when dealing with pipes of different sizes if the clamping jaws 230b are used alone. This improves the versatility of the fixture.

[0033] Example 4 Based on Example 3, and referring to Figures 1-6 The combined positioning mechanism 300 includes a first assembly 310, a second assembly 320 whose one end is movably connected to one end of the first assembly 310, a third assembly 330 whose one end is movably connected to the other end of the second assembly 320, and an adjustment component 340 whose one end is drively connected to the other end of the third assembly 330 and whose other end is drively connected to the end of the first assembly 310 away from the second assembly 320. The first assembly 310, the second assembly 320, and the third assembly 330 cooperate with each other to clamp and fix the first pipe 500, thereby connecting and positioning the second pipe 600 and the first pipe 500. The adjustment component 340 is used to adjust the convergence amplitude of the first assembly 310, the second assembly 320, and the third assembly 330, thereby connecting and positioning or releasing the second pipe 600 and the first pipe 500.

[0034] In the embodiment, reference Figures 5-6The first assembly 310 includes two parallel arc-shaped blocks 310a and a long strip positioning plate 310b located inside the arc-shaped blocks 310a. The second assembly 320 and the third assembly 330 have the same structure as the first assembly 310. The three sets of arc-shaped plates are used to drive the three long strip positioning plates 310b to converge when they are brought together, thereby providing a three-point connection and positioning between the first pipe 500 and the second pipe 600. This makes the second pipe 600 and the first pipe 500 a fixed entity, ensuring that their axes are always aligned and preventing misalignment during welding.

[0035] In the embodiment, reference Figures 5-6 The side wall of the arc-shaped block 310a has a first connecting groove 310a-1 for movably installing the second rotating rod 340b, and one end of the arc-shaped block 310a of the third assembly 330 has a second connecting groove 330a for movably installing the first rotating rod 340a. refer to Figures 5-6 The adjustment assembly 340 includes a first rotating rod 340a located in the second connecting groove 330a, a second rotating rod 340b located in the first connecting groove 310a-1, a slide rod 340c with one end rotatably connected to the first rotating rod 340a and the other end slidably connected to the second rotating rod 340b, and a handle 340d installed on the side wall of the first rotating rod 340a. The first rotating rod 340a is used to install the handle 340d and the slide rod 340c. The second rotating rod 340b is used to slidably install the slide rod 340c. The slide rod 340c is used to facilitate the sliding of the second rotating rod 340b, thereby driving the first assembly 310 to move closer to the center position of the third assembly 330 and the second assembly 320. The handle 340d is used to drive the first rotating rod 340a to rotate when it rotates.

[0036] In this embodiment, the specific workflow is as follows: When connecting the second pipe 600 to be welded with the first pipe 500, the combined positioning mechanism 300 is first placed on the first pipe 500. Then, the second pipe 600 is lifted to a position roughly flush with the first pipe 500. Then, the lever 340d is rotated. At this time, the first rotating rod 340a rotates and slides on the sliding rod 340c, thereby causing the arc plate of the first assembly 310 and the arc plates of the second assembly 320 and the third assembly 330 to converge with each other, indirectly causing the three long strip positioning plates 310b to converge with each other until the second pipe 600 is completely clamped. Then, the second pipe 600 and the first pipe 500 are connected and positioned. At this time, the second pipe 600 and the first pipe 500 become a fixed body, and their axes are aligned, which facilitates the stability during welding. Furthermore, when the combined positioning mechanism 300 works in conjunction with the pipe fixing mechanism 200, it not only completes the alignment of the pipe to be welded, but also serves as a position reference benchmark after the pipe fixing mechanism 200 is released. That is, when the pipe fixing mechanism 200 releases the first pipe 500, the combined positioning mechanism 300 still maintains the axial and radial relative relationship between the first pipe 500 and the second pipe 600 to be welded, so that the first pipe 500 can still be reset along the original central axis after being rotated, without the need for re-alignment.

[0037] Example 5 Based on Example 4, and referring to Figures 1-7 The automatic friction rotation mechanism 400 includes a connecting block 410 fixedly installed on the side wall of the limiting block 220b and having a connecting frame 410a on the side wall, an arc-shaped trigger frame 420 rotatably connected to the connecting block 410, and a friction drive roller 430 rotatably installed on the connecting frame 410a with its outer surface in contact with the outer side wall of the first pipe 500. The connecting block 410 is used to install the arc-shaped trigger frame 420 and the friction drive roller 430. The arc-shaped trigger frame 420 is used to automatically trigger the friction drive roller 430 to rotate when the first pipe 500 and the second pipe 600 are released and fall after initial welding. The friction drive roller 430 is used to make the pipe rotate synchronously during the fall by means of friction between it and the pipe. The top of the arc-shaped trigger frame 420 has a connecting frame 410a. The drive shaft 420a, which is rotatably connected to the connecting hole of the connecting block 410, is used to drive the friction drive roller 430 to rotate when the arc-shaped trigger frame 420 is squeezed and flipped by the pipe. A torsion spring is sleeved on the drive shaft 420a, with the other end connected to the inner wall of the connecting hole. This is to prevent the arc-shaped trigger frame 420 from naturally drooping under its own weight and failing to sense the signal of the pipe falling in time. At the same time, after the pipe is re-clamped and positioned, the arc-shaped trigger frame 420 is reset by its own characteristics. The side wall of the friction drive roller 430 has a connecting piece 430a that is connected to the drive shaft 420a for transmission. This is to prevent the pipe from being reversed after it is re-clamped and positioned, so that the part that was just exposed but not welded is covered again by the long strip positioning block.

[0038] In this embodiment, the connector 430a includes a ratchet connecting seat with a ratchet groove on the side wall and a ratchet (not shown in the figure) with an elastic pawl located inside the ratchet groove and outside the outer wall. Thus, during the slight drop of the pipe after the first weld, when the arc-shaped trigger frame 420 flips and drives the drive shaft 420a to rotate, it can drive the friction drive roller 430 to rotate. When the pipe is re-clamped and positioned for re-welding, it avoids the torsion spring driving the arc-shaped trigger frame 420 and the drive shaft 420a to reverse, which would cause the friction drive shaft 420a to also reverse, resulting in the pipe being synchronously reversed during the repositioning and clamping process, and the part that was just exposed and covered by the elongated positioning plate 310b being covered again.

[0039] In this embodiment, the specific workflow is as follows: After the first weld is performed on the first pipe 500 and the second pipe 600 after connection and positioning, the handle 340d and the adjusting rod 230c are rotated to loosen the pipe. At this time, the pipe begins to fall. The side wall of the falling pipe is squeezed against the arc-shaped trigger frame 420. The arc-shaped trigger frame 420 drives the drive shaft 420a to rotate, thereby driving the friction drive roller 430 to rotate under the connection action of the connector 430a. At this time, the friction drive roller 430 rotates relative to the side wall of the falling pipe due to friction, indirectly driving the pipe to rotate synchronously during the falling process. This causes the part that was not welded in the first weld to be misaligned with the long strip positioning plate 310b. Then, the handle 340d and the adjusting rod 230c are rotated again to reposition and fix the pipe. The part that was not welded in the first weld is then re-welded, thereby completing the overall welding of the first pipe 500 and the second pipe 600. Furthermore, after the combined positioning mechanism 300 completes the connection and positioning of the first pipe 500 and the second pipe 600 to be welded, its own structure decomposes the axial gravity of the pipe into circumferential frictional force acting on the pipe. When the pipe is released, it descends under the action of gravity, and the friction causes the pipe to rotate controllably without the need for external power or manual manipulation. At the same time, the friction surface of the friction drive roller 430 and the positioning surface of the elongated positioning plate 310b together determine the rotation speed and angle range, so that the weld area of ​​the pipe that is blocked can automatically rotate to a position that is easy to re-weld, reducing human judgment errors. In addition, under the linkage of the combined positioning mechanism 300 and the automatic friction rotation mechanism 400, the two can achieve the linkage function of positioning and automatic rotation without the need for additional transmission components 230d or power sources, reducing the complexity and failure rate of the fixture, while avoiding mechanical damage to the pipe surface caused by clamping methods such as clamping.

[0040] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, as long as there is no structural conflict, the features in the disclosed embodiments can be combined with each other in any manner. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A welding positioning fixture for cold-drawn steel pipes, characterized in that, include: A support mechanism (100) is used to support the entire fixture and maintain its stability. A pipe fixing mechanism (200) is mounted on the support mechanism (100) and is used to clamp and fix the first pipe (500) to be welded; A combined positioning mechanism (300) is located on one side of the pipe fixing mechanism (200). When the combined positioning mechanism (300) is working, it connects and positions the second pipe (600) to be welded with the first pipe (500) that has been clamped and fixed by the pipe fixing mechanism (200). An automatic friction rotation mechanism (400) is installed on one side of the pipe fixing mechanism (200). After the first pipe (500) and the second pipe (600) are initially welded, when the pipe fixing mechanism (200) loosens the welded first pipe (500), the automatic friction rotation mechanism (400) is automatically driven to work under the weight of the first pipe (500). The friction force drives the welded first pipe (500) to rotate automatically during the loosening process.

2. The welding positioning fixture for cold-drawn steel pipes according to claim 1, characterized in that, The support mechanism (100) includes a support frame (110) and a balance base (120) located at the bottom of the support frame (110).

3. The cold-drawn steel pipe welding positioning fixture according to claim 2, characterized in that, The pipe fixing mechanism (200) includes a fixing frame (210) connected to the support frame (110) and having a connecting lug (210a) at the top, a top limiting assembly (220) mounted on the fixing frame (210), and a bottom clamping support assembly (230) mounted on the fixing frame (210).

4. The welding positioning fixture for cold-drawn steel pipes according to claim 3, characterized in that, The top limiting assembly (220) includes a fixing plate (220a) detachably mounted on the fixing frame (210), limiting blocks (220b) located on both sides of the fixing plate (220a) and having cross openings at the bottom, and a rubber block (220c) mounted on the cross openings at the bottom of the limiting block (220b).

5. The welding positioning fixture for cold-drawn steel pipes according to claim 4, characterized in that, The bottom clamping support assembly (230) includes a mounting bracket (230a) mounted on the fixed frame (210), grippers (230b) movably mounted on both sides of the mounting bracket (230a), an adjusting rod (230c) movably mounted on the mounting bracket (230a), and a transmission component (230d) with one end movably connected to the mounting bracket (230a) and the other end pulsatorically connected to the two grippers (230b).

6. The welding positioning fixture for cold-drawn steel pipes according to claim 5, characterized in that, The side wall of the mounting bracket (230a) is provided with a straight slide groove (230a-1) and a plurality of arc-shaped slide grooves (230a-2); The transmission component (230d) includes a first connecting shaft (230d-1) that is slidably connected to the linear slide (230a-1), and two second connecting shafts (230d2) that are hinged to the first connecting shaft (230d-1) via connecting rods. The middle part of the gripper (230b) has a third connecting shaft that is slidably connected to the arc-shaped slide groove (230a-2), and the end of the gripper (230b) is rotatably connected to the second connecting shaft (230d2). The adjusting rod (230c) has a limiting groove at one end near the mounting bracket (230a) that corresponds to both ends of the first connecting shaft (230d-1).

7. A cold-drawn steel pipe welding positioning fixture according to claim 6, characterized in that, The combined positioning mechanism (300) includes a first assembly (310), a second assembly (320) whose one end is movably connected to one end of the first assembly (310), a third assembly (330) whose one end is movably connected to the other end of the second assembly (320), and an adjustment component (340) whose one end is drivenly connected to the other end of the third assembly (330) and whose other end is drivenly connected to the end of the first assembly (310) away from the second assembly (320).

8. A welding positioning fixture for cold-drawn steel pipes according to claim 7, characterized in that, The first assembly (310) includes two parallel arc-shaped blocks (310a) and a long strip positioning plate (310b) located inside the arc-shaped blocks (310a). The second assembly (320) and the third assembly (330) have the same structure as the first assembly (310).

9. A welding positioning fixture for cold-drawn steel pipes according to claim 8, characterized in that, The sidewall of the arc-shaped block (310a) has a first connecting groove (310a-1), and one end of the arc-shaped block (310a) of the third assembly (330) has a second connecting groove (330a). The adjustment assembly (340) includes a first rotating rod (340a) located in the second connecting groove (330a), a second rotating rod (340b) located in the first connecting groove (310a-1), a slide rod (340c) with one end rotatably connected to the first rotating rod (340a) and the other end slidably connected to the second rotating rod (340b), and a handle (340d) installed on the side wall of the first rotating rod (340a).

10. A welding positioning fixture for cold-drawn steel pipes according to claim 9, characterized in that, The automatic friction rotation mechanism (400) includes a connecting block (410) fixedly installed on the side wall of the limiting block (220b) and having a connecting frame (410a) on the side wall, an arc-shaped trigger frame (420) rotatably connected to the connecting block (410), and a friction drive roller (430) rotatably installed on the connecting frame (410a) and having its outer surface in contact with the outer wall of the first pipe (500). The top of the arc-shaped trigger frame (420) has a drive shaft (420a) rotatably connected to the connecting hole of the connecting block (410). A torsion spring with its other end connected to the inner wall of the connecting hole is sleeved on the drive shaft (420a). The side wall of the friction drive roller (430) has a connecting piece (430a) that is drively connected to the drive shaft (420a).

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