A pipe straight seam welding clamping tool and clamping installation method

Abstract

The present application relates to the technical field of pipeline welding, and discloses a pipeline straight seam welding clamping tool and a clamping installation method, which comprise a rack, a bearing chip guide assembly, a welding assembly and a clamping assembly; the bearing chip guide assembly is installed on the top of the rack; the bearing chip guide assembly comprises a chip guide groove, an inclined backing plate, a chip collecting groove and a support seat; the support seat is fixedly installed on the rack; the inclined backing plate is symmetrically arranged on the two sides of the support seat; the chip guide groove is arrayed along the length direction of the inclined backing plate; and the chip collecting groove is arranged below the inclined backing plate and fixedly connected with the rack. The pipeline straight seam welding clamping tool and the clamping installation method are characterized in that a slidable limiting rod is arranged on the supporting clamping shaft, the clamping fulcrum span is quickly adjusted by translating the limiting rod, a single tool can be adapted to various outer diameter pipelines, the clamping die does not need to be replaced, hydraulic synchronous clamping adjustment is achieved, manual screwing of bolts is not needed, the pipe diameter switching and adjusting time is shortened, and multiple specifications of pipes can be processed in batches.

Description

Technical Field

[0001] This invention relates to the field of pipeline welding technology, specifically to a clamping fixture and clamping installation method for straight seam welding of pipelines. Background Technology

[0002] Straight seam welding is a common processing technique in the field of metal pipe processing. Existing pipe welding clamping fixtures mostly adopt a single-sided rigid clamping structure, which relies on a single point or a single row of support to limit the pipe, and has the following defects:

[0003] The pipe has a cylindrical curved surface structure, and the single-point rigid clamping force is concentrated. During the welding process, it is affected by the thermal stress of the welding gun and the welding vibration, which makes the pipe prone to radial displacement and circumferential rotation. The alignment accuracy of the straight seam weld decreases, resulting in defects such as weld skew, uneven weld width, and welding omissions, and the finished product qualification rate is low.

[0004] Single-size clamping structures can only clamp pipes of a fixed diameter. For pipes of different outer diameters, the entire set of clamping molds needs to be replaced, which is time-consuming and has poor production versatility. Rigid clamping structures are prone to scratching the outer wall of the pipe, and thin-walled pipes are prone to extrusion deformation when clamped.

[0005] Pipeline welding generates a large amount of metal slag and high-temperature iron filings. Existing tooling lacks a dedicated chip guiding structure, causing slag to accumulate below the pipe weld and on the clamping contact surface. The high-temperature iron filings continuously burn the outer wall of the pipe, causing surface burns and accelerated wear of the clamps. At the same time, the accumulated slag obscures the weld, making it impossible for operators to observe the welding process in real time. Summary of the Invention

[0006] The purpose of this invention is to provide a clamping fixture and clamping installation method for straight seam welding of pipelines, in order to solve the problems mentioned in the background art, such as the pipeline being a cylindrical curved surface structure, the single-point rigid clamping force being concentrated, the pipeline being affected by the thermal stress of the welding gun and the welding vibration during the welding process, the pipeline being prone to radial displacement and circumferential rotation, the straight seam weld alignment accuracy being reduced, and defects such as weld skew, uneven weld width, and welding omissions occurring, resulting in a low finished product qualification rate.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a pipe straight seam welding clamping fixture and clamping installation method, comprising: a frame, a chip-carrying and chip-guiding assembly, a welding assembly, and a clamping assembly;

[0008] A chip-guiding assembly is installed on the top of the frame. This assembly includes chip guide grooves, inclined pads, a chip collection groove, and a support base. The support base is fixedly installed on the frame. The inclined pads are symmetrically arranged on both sides of the support base. The chip guide grooves are arrayed along the length of the inclined pads. The chip collection groove is located below the inclined pads and is fixedly connected to the frame. The support base is locked to the upper part of the frame, symmetrically supporting the inclined pads on both sides, forming a V-shaped placement position with a lower center and higher sides. This adapts to the natural placement and positioning of cylindrical pipes. The chip guide grooves are densely arranged along the length of the inclined pads, allowing welding slag and iron filings that fall during welding to slide down through the grooves, preventing slag accumulation on the contact surface between the pipe and the pads.

[0009] Furthermore, the chip guide groove is a trapezoidal through groove, which slopes downwards and connects to the chip collection groove. A detachable slag discharge pull-out box is provided at the front end of the chip collection groove. The inclined pad is arranged at an angle to prevent axial sliding during pipe welding and to guide the welding slag to flow downwards into the chip collection groove. The chip collection groove is located directly below the inclined pad to collect all falling welding slag. The front pull-out box can be periodically removed for cleaning to prevent welding slag from accumulating and spilling, contaminating the tooling and workpiece.

[0010] Furthermore, the welding assembly is slidably mounted on the rear side of the frame. The welding assembly includes a moving guide rail, a drive slide, and a welding head. The moving guide rail is horizontally fixed to the upper part of the frame, the drive slide is slidably mounted on the moving guide rail, and the welding head is vertically fixed to the bottom of the drive slide. The welding head faces the pipe placement position between two sets of inclined pads. The moving guide rail is horizontally mounted on the rear side of the frame, and the axis of the guide rail is completely parallel to the center line of the pipe seam, limiting the drive slide to move only in a straight line along the weld seam direction. The drive slide has a built-in servo walking module, which receives signals from the control system and slides back and forth at a uniform speed along the guide rail, precisely controlling the welding walking speed. The welding head is vertically mounted on the bottom of the slide and can be raised and lowered to adjust the distance between the welding nozzle and the pipe weld seam. When the slide moves, the welding head follows synchronously, completing continuous welding operations along the entire straight seam of the pipe.

[0011] Furthermore, the moving guide rail is arranged parallel to the central axis of the pipe placement station on the inclined pad, and the drive slide moves in a uniform reciprocating linear motion along the moving guide rail.

[0012] Furthermore, all clamping components are mounted above the inclined pad. Each clamping component includes a connecting block, a support clamping shaft, a pressing pad, a rotating plate, a hydraulic cylinder, and a U-shaped rotating rod. The connecting block is locked and fixed to the inclined pad. One end of the hydraulic cylinder is hinged to the connecting block, and the other end is hinged to the rotating plate. The connecting block, fixed to the inclined pad, serves as the hinged mounting base for the hydraulic cylinder. One end of the hydraulic cylinder is hinged to the connecting block, and the other end is hinged to the rotating plate. The hydraulic system outputs pressure to push the piston rod of the hydraulic cylinder outward, causing the rotating plate to rotate around the hinge point. The rotating plate is rigidly connected to the U-shaped rotating rod. The rotation of the rotating plate synchronously causes the U-shaped rotating rod to swing as a whole. The U-shaped rotating rod uses the pressing pad as the fulcrum of rotation, and the upper support clamping shaft swings in an arc. The two U-shaped rotating rods on both sides swing inward synchronously, so that the support clamping shaft presses against the outer wall of the pipe to complete the clamping. The hydraulic cylinder retracts in the opposite direction, and the support clamping shaft swings outward to release the workpiece.

[0013] Furthermore, the rotating plate is fixedly connected to one end of the U-shaped rotating rod, and a supporting clamping shaft passes through the middle of the U-shaped rotating rod. The lower end of the U-shaped rotating rod is rotatably connected to a compression pad, and segmented arc strips are provided on the inner side of the compression pad. The compression pad is an arc-shaped elastic pad with an arc matching the outer curved surface of the pipe to avoid rigid clamping from scratching the pipe. The segmented arc strips are evenly distributed on the inner side of the compression pad, with multiple arc strips contacting the outer wall of the pipe at multiple points, dispersing the clamping pressure and preventing the thin-walled pipe from being squeezed and deformed. At the same time, the anti-slip texture of the arc strips increases the frictional resistance and prevents circumferential rotation of the pipe during welding.

[0014] Furthermore, the extrusion pad is an arc-shaped elastic pad, and the segmented arc strips are arranged at equal intervals along the arc-shaped inner wall of the extrusion pad, with anti-slip textures on the surface of the segmented arc strips.

[0015] Furthermore, the supporting clamping shaft includes a limiting rod, a collar, a connecting shaft, and a bellows. The limiting rod passes through the U-shaped rotating rod, and the collar is fixed to both ends of the limiting rod. The connecting shaft coaxially connects the two limiting rod sections, and the bellows seals the gap between the connecting shaft and the collar. The limiting rod passes through the U-shaped rotating rod, and the two limiting rod sections are coaxially connected via the connecting shaft. The operator can pull the limiting rod left and right to change the span of the fulcrum of the U-shaped rotating rod, adapting to pipes of different outer diameters. The collar is fixed to both ends of the limiting rod as a limiting and locking structure. After adjustment, the collar is tightened to fix the position of the limiting rod and prevent the fulcrum from shifting during clamping.

[0016] Furthermore, the bellows is a corrosion-resistant metal telescopic bellows, with both ends of the bellows being sealed and welded to two side collars, and the interior of the bellows is filled with high-temperature resistant grease. The bellows covers the mating gap between the mating shaft and the collars, and extends and retracts synchronously with the extension and retraction of the limiting rod, sealing and blocking the sliding gap of the shaft body, preventing welding shavings and dust from entering the shaft mating surface, and preventing the shaft body from rusting, jamming, or failing.

[0017] Furthermore, a method for clamping and installing a straight seam welded pipe comprises the following steps:

[0018] S1. Pipe placement: The worker places the pipe to be welded horizontally between the compression pads on the inclined pads on both sides and manually adjusts the position of the pipe so that the straight seam to be welded is directly opposite the welding head above.

[0019] S2. Clamping and locking: The staff simultaneously starts the hydraulic cylinders of the clamping components on both sides. The hydraulic cylinders extend and push the rotating plate to rotate. The rotating plate drives the U-shaped rotating rod to rotate around the support clamping shaft, so that the two sides of the extrusion pads move towards the outer wall of the pipe at the same time. The segmented arc strip fits the curved surface of the pipe to complete the limit clamping.

[0020] S3. Welding operation: The worker starts the welding assembly and drives the slide to move at a constant speed along the moving guide rail. The welding head moves down to continuously weld the straight seam of the pipe. The welding slag produced by welding slides down the chip guide groove to the chip collection groove for unified collection.

[0021] S4. Unloading: After welding a single pipe, the hydraulic cylinder retracts and pulls the rotating plate to rotate in the opposite direction, supporting the clamp shaft to detach from the outer wall of the pipe. The welded pipe is then manually removed, and the welding slag in the chip collection groove is emptied. Step S2 is then repeated for cyclic processing.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] (i) The pipe straight seam welding clamping fixture and clamping installation method are achieved by synchronously driving the U-shaped rotating rod to swing and clamp the pipe through the hydraulic cylinders on both sides, and the clamping shafts on both sides synchronously center and clamp the pipe. The segmented arc strips fit the outer wall of the pipe at multiple points in an arc shape, and the radial and circumferential bidirectional limit is achieved. During the welding process, the pipe does not deviate or rotate, the straight seam weld is always aligned with the welding joint, the weld formation is uniform, and defects such as off-center welding and missing welding are eliminated.

[0024] (ii) The pipe straight seam welding clamping fixture and clamping installation method are provided by setting a sliding limit rod through the abutment clamping shaft. The span of the clamping support point can be quickly adjusted by moving the limit rod. A single set of fixtures can be adapted to pipes of various outer diameters without changing the clamping mold. Hydraulic synchronous clamping adjustment is provided, and manual bolt tightening is not required. The pipe diameter switching adjustment time is shortened, and it is suitable for batch processing of multiple specifications of pipes.

[0025] (III) The pipe straight seam welding clamping fixture and clamping installation method integrate the chip guide groove and the chip collection groove through the chip guide component. The high temperature welding iron chips directly pass through the pad and fall into the chip collection groove, which will not accumulate on the pipe clamping contact surface and avoid the high temperature welding slag burning the outer wall of the pipe. At the same time, it prevents the welding slag from filling the clamping gap and causing the jaws to wear and the clamping to slip, which greatly extends the service life of the clamping component and eliminates the need for frequent shutdown to clean the welding slag on the workpiece surface.

[0026] (iv) The straight seam welding clamping fixture and clamping installation method of the pipeline is to set a metal bellows sealing structure at the joint position of the support clamping shaft. During the extension and retraction of the shaft, the bellows completely blocks the sliding gap, isolates the welding slag, dust and welding fumes from corroding the shaft core, avoids shaft corrosion, jamming and adjustment failure, and reduces the frequency of fixture maintenance.

[0027] (v) The straight seam welding clamping fixture and clamping installation method of the pipeline uses an arc-shaped elastic material with segmented arc strips for flexible clamping through the extrusion pad. The clamping pressure is evenly distributed by multiple arc strips, which greatly reduces the rigid contact stress. Thin-walled pipelines will not have extrusion dents or scratches on the outer wall. There is no need for subsequent grinding and repair of the pipe surface, reducing processing steps. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is another schematic diagram of the overall structure of the present invention;

[0030] Figure 3 This is a schematic diagram of the chip-carrying assembly structure of the present invention;

[0031] Figure 4 This is a schematic diagram of the welding assembly structure of the present invention;

[0032] Figure 5 This is a schematic diagram of the structure of the chip-carrying and clamping components of the present invention;

[0033] Figure 6 This is a cross-sectional schematic diagram of the chip-carrying assembly structure of the present invention;

[0034] Figure 7 This is an enlarged schematic diagram of structure A of the present invention;

[0035] Figure 8 This is a schematic diagram of the clamping component structure of the present invention;

[0036] Figure 9 This is a disassembled schematic diagram of the clamping component structure of the present invention;

[0037] Figure 10 This is a disassembly diagram of the supporting clamping shaft structure of the present invention;

[0038] Figure 11 This is an enlarged schematic diagram of structure B of the present invention;

[0039] Figure 12 This is a schematic flowchart of a pipe straight seam welding clamping and installation method according to the present invention.

[0040] In the diagram: 1. Frame; 2. Chip-carrying assembly; 21. Chip guide groove; 22. Inclined pad; 23. Chip collection groove; 24. Support base; 3. Welding assembly; 31. Moving guide rail; 32. Drive slide; 33. Welding head; 4. Clamping assembly; 41. Connecting block; 42. Supporting clamping shaft; 421. Limiting rod; 422. Collar; 423. Connecting shaft; 424. Bellows; 43. Extrusion pad; 44. Rotating plate; 45. Hydraulic cylinder; 46. Segmented arc bar; 47. U-shaped rotating rod. Detailed Implementation

[0041] Example 1, as Figures 1 to 11 As shown, the present invention provides a technical solution: a pipe straight seam welding clamping fixture and clamping installation method, comprising: a frame 1, a chip-carrying and chip-guiding assembly 2, a welding assembly 3, and a clamping assembly 4;

[0042] The top of the frame 1 is equipped with a chip-carrying and guiding assembly 2. The chip-carrying and guiding assembly 2 includes chip guide grooves 21, inclined pads 22, chip collection grooves 23, and a support base 24. The support base 24 is fixedly installed on the frame 1. The inclined pads 22 are symmetrically and inclinedly arranged on both sides of the support base 24. The chip guide grooves 21 are arrayed along the length of the inclined pads 22. The chip collection grooves 23 are located below the inclined pads 22 and are fixedly connected to the frame 1. The support base 24 is locked and fixed to the upper part of the frame 1, symmetrically supporting the inclined pads 22 on both sides, so that the inclined pads form a V-shaped placement position with a low middle and high sides, which is suitable for the natural placement and positioning of cylindrical pipes. The chip guide grooves 21 are densely arranged along the length of the inclined pads. Welding slag and iron filings that fall during welding fall through the chip guide grooves and slide down, avoiding the accumulation of welding slag on the contact surface between the pipe and the pad.

[0043] The chip guide groove 21 is a trapezoidal through groove, which slopes downwards and connects to the chip collection groove 23. A detachable slag discharge pull-out box is provided at the front end of the chip collection groove 23. The inclined pad 22 is arranged at an angle to prevent axial sliding during pipe welding and to guide the welding slag to flow downwards into the chip collection groove. The chip collection groove 23 is located directly below the inclined pad and collects all falling welding slag. The front pull-out box can be periodically removed for cleaning to prevent welding slag from accumulating and spilling, contaminating the tooling and workpiece.

[0044] The welding assembly 3 is slidably mounted on the rear side of the frame 1. The welding assembly 3 includes a moving guide rail 31, a drive slide 32, and a welding head 33. The moving guide rail 31 is horizontally fixed to the upper part of the frame 1. The drive slide 32 is slidably mounted on the moving guide rail 31. The welding head 33 is vertically fixed to the bottom of the drive slide 32, and the welding head 33 faces the pipe placement position between the two sets of inclined pads 22. The moving guide rail 31 is horizontally mounted on the rear side of the frame, and the axis of the guide rail is completely parallel to the center line of the pipe seam, limiting the drive slide to move only in a straight line along the weld seam direction. The drive slide 32 has a built-in servo walking module. After receiving the control system signal, it slides back and forth along the guide rail at a uniform speed to precisely control the welding walking speed. The welding head 33 is vertically mounted on the bottom of the slide and can be raised and lowered to adjust the distance between the welding nozzle and the pipe weld seam. When the slide moves, the welding head follows synchronously to complete the continuous welding operation along the entire straight seam of the pipe.

[0045] The movable guide rail 31 is arranged parallel to the central axis of the pipe placement position on the inclined pad 22, and the drive slide 32 moves in uniform reciprocating linear motion along the movable guide rail 31.

[0046] Example 2, based on Example 1, such as Figures 7 to 11 As shown, the clamping components 4 are all installed above the inclined pad 22. The clamping components 4 include a connecting block 41, a supporting clamping shaft 42, a squeezing pad 43, a rotating plate 44, a hydraulic cylinder 45, and a U-shaped rotating rod 47. The connecting block 41 is locked and fixed on the inclined pad 22. One end of the hydraulic cylinder 45 is hinged to the connecting block 41, and the other end is hinged to the rotating plate 44. The connecting block 41 is fixed on the inclined pad 22 as a hinged mounting base for the hydraulic cylinder. One end of the hydraulic cylinder 45 is hinged to the connecting block, and the other end is hinged to the rotating plate 44. The hydraulic system outputs pressure to push the piston rod of the hydraulic cylinder to extend, causing the rotating plate 44 to rotate around the hinge point. The rotating plate is rigidly connected to the U-shaped rotating rod 47. The rotation of the rotating plate synchronously drives the U-shaped rotating rod to swing as a whole. The U-shaped rotating rod 47 uses the extrusion pad 43 as the rotation fulcrum, and the upper end of the support clamping shaft 42 swings in an arc. The two sides of the U-shaped rotating rod swing inward synchronously so that the support clamping shaft 42 extrudes the outer wall of the pipe to complete the clamping. The hydraulic cylinder contracts in the opposite direction, and the support clamping shaft 42 swings outward to release the workpiece.

[0047] The rotating plate 44 is fixedly connected to one end of the U-shaped rotating rod 47. A support clamping shaft 42 passes through the middle of the U-shaped rotating rod 47. The lower end of the U-shaped rotating rod 47 is rotatably connected to the extrusion pad 43. The extrusion pad 43 is provided with segmented arc strips 46 on its inner side. The extrusion pad 43 is an arc-shaped elastic pad with an arc matching the outer curved surface of the pipe to avoid rigid clamping from scratching the pipe. The segmented arc strips 46 are evenly distributed on the inner side of the extrusion pad. Multiple arc strips make multiple points of contact with the outer wall of the pipe, dispersing the clamping pressure and preventing the thin-walled pipe from being squeezed and deformed. At the same time, the anti-slip texture of the arc strips increases the frictional resistance and prevents circumferential rotation of the pipe during welding.

[0048] The extrusion pad 43 is an arc-shaped elastic pad, and the segmented arc strips 46 are arranged at equal intervals along the arc-shaped inner wall of the extrusion pad 43. Anti-slip textures are formed on the surface of the segmented arc strips 46.

[0049] The supporting clamping shaft 42 includes a limiting rod 421, a collar 422, a connecting shaft 423, and a bellows 424. The limiting rod 421 passes through a U-shaped rotating rod 47. The collar 422 is fixed to both ends of the limiting rod 421. The connecting shaft 423 coaxially connects the two sections of the limiting rod 421. The bellows 424 seals the gap between the connecting shaft 423 and the collar 422. The limiting rod 421 passes through the U-shaped rotating rod 47, and the two sections of the limiting rod are coaxially connected by the connecting shaft 423. The operator can pull the limiting rod to move it left and right, changing the span of the fulcrum of the U-shaped rotating rod to adapt to pipes with different outer diameter specifications. The collar 422 is fixed to both ends of the limiting rod as a limiting and locking structure. After adjustment, the collar is locked to fix the position of the limiting rod and prevent the fulcrum from shifting during clamping.

[0050] The bellows 424 is a corrosion-resistant metal telescopic bellows. Both ends of the bellows 424 are sealed and welded to the two side collars 422. The interior of the bellows 424 is filled with high-temperature resistant grease. The bellows 424 covers the mating gap between the shaft and the collars, extending and retracting synchronously with the extension and retraction of the limiting rod. It seals and blocks the sliding gap of the shaft, preventing welding shavings and dust from entering the shaft mating surface, thus preventing shaft corrosion and jamming failure.

[0051] Example 3, based on Examples 1 and 2, such as Figure 12 As shown, a pipe straight seam welding clamping installation method consists of the following steps:

[0052] S1. Pipe placement: The worker places the pipe to be welded horizontally between the compression pads 43 on the inclined pads 22 on both sides and manually adjusts the position of the pipe so that the straight seam to be welded is directly opposite the upper welding head 33.

[0053] S2. Clamping and locking: The staff simultaneously starts the hydraulic cylinders 45 of the clamping components 4 on both sides. The hydraulic cylinders 45 extend and push the rotating plate 44 to rotate. The rotating plate 44 drives the U-shaped rotating rod 47 to rotate around the support clamping shaft 42, so that the two side extrusion pads 43 move towards the outer wall of the pipe simultaneously, and the segmented arc strips 46 fit the curved surface of the pipe to complete the limit clamping.

[0054] S3. Welding operation: The worker starts the welding component 3, drives the slide 32 to move at a constant speed along the moving guide rail 31, and the welding head 33 moves down to perform continuous welding on the straight seam of the pipe. The welding slag produced by welding slides down the chip guide groove 21 to the chip collection groove 23 for unified collection.

[0055] S4. Unloading: After the welding of a single pipe is completed, the hydraulic cylinder 45 retracts and pulls the rotating plate 44 to rotate in the opposite direction, supporting the clamping shaft 42 to detach from the outer wall of the pipe. The welded pipe is then manually removed, and the welding slag in the chip collection groove 23 is emptied. Step S2 is then repeated for cyclic processing.

[0056] In use, the support base 24 is locked and fixed on the upper part of the frame 1, symmetrically supporting the inclined pads 22 on both sides, so that the inclined pads form a V-shaped placement position with a low middle and high sides, which is suitable for the natural placement and positioning of cylindrical pipes. The chip guide grooves 21 are densely opened along the length of the inclined pads. During the welding process, the welding slag and iron filings fall through the chip guide grooves and slide down, avoiding the accumulation of welding slag on the contact surface between the pipe and the pad.

[0057] The inclined pad 22 is arranged at an angle to prevent the pipe from sliding along the axis during welding and to guide the welding slag to flow downward to the chip collection groove. The chip collection groove 23 is located directly below the inclined pad to collect all the falling welding slag. The front pull-out box can be pulled out periodically for cleaning to prevent welding slag from accumulating and spilling and contaminating the tooling and workpiece.

[0058] The movable guide rail 31 is horizontally mounted on the rear side of the frame. The axis of the guide rail is completely parallel to the center line of the straight seam of the pipe, which limits the drive slide to move only in a straight line along the weld seam direction. The drive slide 32 has a built-in servo walking module. After receiving the control system signal, it slides back and forth along the guide rail at a uniform speed to precisely control the welding walking speed. The welding head 33 is vertically mounted on the bottom of the slide. It can be raised and lowered to adjust the distance between the welding nozzle and the pipe weld seam. When the slide moves, the welding head follows synchronously to complete the continuous welding operation along the entire straight seam of the pipe.

[0059] The connecting block 41 is fixed on the inclined pad 22 as a hinged mounting base for the hydraulic cylinder. One end of the hydraulic cylinder 45 is hinged to the connecting block, and the other end is hinged to the rotating plate 44. The hydraulic system outputs pressure to push the piston rod of the hydraulic cylinder to extend, causing the rotating plate 44 to rotate around the hinge point. The rotating plate is rigidly connected to the U-shaped rotating rod 47. The rotation of the rotating plate synchronously drives the U-shaped rotating rod to swing as a whole. The U-shaped rotating rod 47 uses the extrusion pad 43 as the rotation fulcrum, and the upper end of the support clamping shaft 42 swings in an arc. The two sides of the U-shaped rotating rod swing inward synchronously so that the support clamping shaft 42 extrudes the outer wall of the pipe to complete the clamping. The hydraulic cylinder contracts in the opposite direction, and the support clamping shaft 42 swings outward to release the workpiece.

[0060] The extrusion pad 43 is an arc-shaped elastic pad with an arc matching the outer curved surface of the pipe, avoiding rigid clamping that could scratch the pipe. The segmented arc strips 46 are evenly arranged on the inner side of the extrusion pad, with multiple arc strips contacting the outer wall of the pipe at multiple points, dispersing the clamping pressure and preventing the thin-walled pipe from being squeezed and deformed. At the same time, the anti-slip texture of the arc strips increases the frictional resistance and prevents circumferential rotation of the pipe during welding.

[0061] The limiting rod 421 passes through the U-shaped rotating rod 47. The two limiting rods are coaxially spliced ​​through the docking shaft 423. The operator can pull the limiting rod to move left and right, change the fulcrum span of the U-shaped rotating rod, and adapt to pipes with different outer diameter specifications. The collar 422 is fixed at both ends of the limiting rod as a limiting locking structure. After adjustment, the collar is locked to fix the position of the limiting rod and prevent the fulcrum from shifting during clamping.

[0062] The 424 bellows covers the mating gap between the shaft and the collar, and extends and retracts synchronously with the extension and retraction of the limit rod, sealing and blocking the sliding gap of the shaft, preventing welding shavings and dust from entering the shaft mating surface, and preventing the shaft from rusting, jamming and failure.

Claims

1. A clamping fixture for straight seam welding of pipes, characterized in that, It includes a frame (1), a chip-carrying assembly (2), a welding assembly (3), and a clamping assembly (4); The top of the frame (1) is equipped with a chip-carrying assembly (2). The chip-carrying assembly (2) includes a chip guide groove (21), an inclined pad (22), a chip collection groove (23), and a support base (24). The support base (24) is fixedly installed on the frame (1). The inclined pad (22) is symmetrically and inclinedly arranged on both sides of the support base (24). The chip guide groove (21) is arrayed along the length direction of the inclined pad (22). The chip collection groove (23) is located below the inclined pad (22) and is fixedly connected to the frame (1).

2. The pipe straight seam welding clamping fixture according to claim 1, characterized in that: The chip guide groove (21) is a trapezoidal through groove. The chip guide groove (21) is inclined downward and connected to the chip collection groove (23). A detachable slag discharge pull box is provided at the front end of the chip collection groove (23).

3. The pipe straight seam welding clamping fixture according to claim 1, characterized in that: The welding assembly (3) is slidably mounted on the rear side of the frame (1). The welding assembly (3) includes a moving guide rail (31), a drive slide (32) and a welding head (33). The moving guide rail (31) is horizontally fixed on the upper part of the frame (1). The drive slide (32) is slidably mounted on the moving guide rail (31). The welding head (33) is vertically fixed on the bottom of the drive slide (32). The welding head (33) is directly facing the pipe placement position between the two sets of inclined pads (22).

4. The pipe straight seam welding clamping fixture according to claim 3, characterized in that: The moving guide rail (31) is arranged parallel to the central axis of the pipe placement station on the inclined pad (22), and the driving slide (32) moves in uniform reciprocating linear motion along the moving guide rail (31).

5. A pipe straight seam welding clamping fixture according to claim 4, characterized in that: The clamping components (4) are all installed above the inclined pad (22). The clamping components (4) include a connecting block (41), a support clamping shaft (42), a squeezing pad (43), a rotating plate (44), a hydraulic cylinder (45), and a U-shaped rotating rod (47). The connecting block (41) is locked and fixed on the inclined pad (22). One end of the hydraulic cylinder (45) is hinged to the connecting block (41), and the other end is hinged to the rotating plate (44).

6. The pipe straight seam welding clamping fixture according to claim 5, characterized in that: The rotating plate (44) is fixedly connected to one end of the U-shaped rotating rod (47). A support clamping shaft (42) is inserted through the middle of the U-shaped rotating rod (47). The lower end of the U-shaped rotating rod (47) is rotatably connected to the extrusion pad (43). The inner side of the extrusion pad (43) is provided with segmented arc strips (46).

7. A pipe straight seam welding clamping fixture according to claim 6, characterized in that: The extrusion pad (43) is an arc-shaped elastic pad, and the segmented arc strips (46) are arranged at equal intervals along the arc-shaped inner wall of the extrusion pad (43). Anti-slip textures are opened on the surface of the segmented arc strips (46).

8. A pipe straight seam welding clamping fixture according to claim 7, characterized in that: The supporting clamp shaft (42) includes a limiting rod (421), a collar (422), a docking shaft (423), and a bellows (424). The limiting rod (421) passes through the U-shaped rotating rod (47). The collar (422) is fixed to both ends of the limiting rod (421). The docking shaft (423) is coaxially connected to the two sections of the limiting rod (421). The bellows (424) seals and covers the docking gap between the docking shaft (423) and the collar (422).

9. A pipe straight seam welding clamping fixture according to claim 8, characterized in that: The corrugated pipe (424) is a corrosion-resistant metal telescopic corrugated pipe. Both ends of the corrugated pipe (424) are respectively sealed and welded to the two side collars (422). The corrugated pipe (424) is filled with high-temperature resistant grease.

10. A pipe straight seam welding clamping fixture according to any one of claims 1-9 is now proposed as a pipe straight seam welding clamping and installation method, characterized in that, It consists of the following steps: S1. Pipe placement: The staff places the pipe to be welded horizontally between the compression pads (43) on the inclined pads (22) on both sides and manually adjusts the position of the pipe so that the straight seam to be welded is directly opposite the upper welding head (33). S2, clamping and locking, the staff simultaneously start the hydraulic cylinders (45) of the clamping components (4) on both sides, the hydraulic cylinders (45) extend and push the rotating plate (44) to rotate, the rotating plate (44) drives the U-shaped rotating rod (47) to rotate around the support clamping shaft (42), so that the two sides of the extrusion pads (43) move towards the outer wall of the pipe at the same time, and the segmented arc strip (46) fits the curved surface of the pipe to complete the limit clamping; S3. Welding operation: The staff starts the welding assembly (3) and drives the slide (32) to move at a constant speed along the moving guide rail (31). The welding head (33) moves down to perform continuous welding on the straight seam of the pipeline. The welding slag produced by welding slides down through the chip guide groove (21) to the chip collection groove (23) for unified collection. S4. Unloading: After the welding of a single pipe is completed, the hydraulic cylinder (45) retracts and pulls the rotating plate (44) to rotate in the opposite direction, supporting the clamping shaft (42) to separate from the outer wall of the pipe. The welded pipe is then manually removed, and the welding slag in the chip collection groove (23) is emptied before repeating step S2 for cycle processing.

Images