A positioning welding device for pipe welding

Abstract

The application belongs to the technical field of welding equipment, and particularly relates to a positioning and welding device for pipeline welding, which comprises a workbench. A bearing plate is slidably arranged at the top end of the workbench. Pipeline clamping devices are symmetrically arranged at the top end of the bearing plate. A first screw rod is threadedly arranged at the bottom end of the bearing plate. One end of the first screw rod penetrates through the workbench and extends to one side of the workbench. A motor is fixedly arranged at the end of the first screw rod extending to one side of the workbench. A protection assembly for preventing sparks from damaging the first screw rod is arranged at the bottom end of the bearing plate. A self-adapting clamping regulation and control mechanism with elastic pre-stress is formed by a driving block, a synchronous strip and an auxiliary clamping plate. The mechanism can realize pipeline workpiece clamping action while retaining the dynamic regulation and control capability of adjustable clamping spacing and clamping pressure distribution, and is suitable for various pipeline workpieces with different diameters, wall thicknesses and deformation degrees.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, specifically a positioning welding device for pipeline welding. Background Technology

[0002] Pipeline welding is widely used in many industries such as petrochemical, metallurgy, power and municipal engineering. During the welding process, if the weld area is not accurately aligned or the clamping is unstable, it is very easy to cause quality defects such as weld offset, thermal deformation and insufficient penetration.

[0003] Therefore, existing welding auxiliary equipment is often equipped with a clamp structure, but its versatility and degree of automation are limited, making it difficult to quickly adapt to pipe fittings of different diameters or structures, which seriously affects welding efficiency.

[0004] Especially in multi-station continuous welding operations, the lack of auxiliary positioning structures with automatic adjustment capabilities and high-precision positioning functions has become a bottleneck restricting the efficiency of welding equipment.

[0005] Therefore, there is an urgent need to provide a positioning welding device that is suitable for welding various types of pipes and has high adaptability and stability. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies and address the problem that welding pipes with other materials easily generates a large number of sparks, which can damage the feeding device, thereby reducing work efficiency and shortening the service life of the device, this invention proposes a positioning welding device for pipe welding.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a positioning welding device for pipe welding, including a worktable; a bearing plate is slidably installed on the top of the worktable, and pipe clamping devices are symmetrically installed on the top of the bearing plate; a first lead screw is threadedly installed on the bottom of the bearing plate; one end of the first lead screw passes through the worktable and extends to one side of the worktable; a motor is fixedly installed on the end of the first lead screw extending to one side of the worktable; and a protective component for preventing sparks from damaging the first lead screw is provided at the bottom of the bearing plate.

[0008] The protective assembly includes toothed plates disposed at the bottom end of the support plate. Two toothed plates are symmetrically installed. A first gear is meshed on one side of each toothed plate. The first gear is rotatably mounted on the bottom end of each first gear. A first bevel gear is fixedly installed at the bottom end of each first gear. A second bevel gear is meshed on one side of each first bevel gear. A synchronizing rod is fixedly installed on the side of each second bevel gear away from the first bevel gear. A protective plate is fixedly installed at the other end of each synchronizing rod. A drive assembly is provided on one side of each protective plate.

[0009] Preferably, the drive assembly includes drive blocks disposed on one side of the protective plate. The drive blocks are all slidably mounted on the inner wall of the synchronization groove. The synchronization groove is opened at the top of the support plate. One end of each drive block abuts against a synchronization bar. The synchronization bars are all slidably mounted on the inner wall of the synchronization groove. A first spring is installed at the bottom end of each synchronization bar. A first drive rack is slidably mounted on the end of the worktable away from the motor. A second gear is meshed on one side of the first drive rack. A second drive rack is meshed on the side of the second gear away from the first drive rack. A movable platform is fixedly mounted on the top end of the second drive rack. Auxiliary components are provided at one end of the synchronization bar and the top end of the movable platform.

[0010] Preferably, the auxiliary component includes an auxiliary clamping plate disposed at one end of the synchronization bar or at the top of the moving stage. Fixing boxes are slidably installed on all sides of the auxiliary clamping plate. One fixing box is fixedly installed at the top of the support plate, and the other fixing box is fixedly installed at the top of the moving stage. A second spring is installed on one side of each auxiliary clamping plate, and an adjustment component is provided on one side of each fixing box.

[0011] Preferably, the adjustment assembly includes an adjustment handle disposed on one side of the fixed box, and a second lead screw is fixedly installed on one side of the adjustment handle. One end of the second lead screw passes through the fixed box and extends to one side of the fixed box. An adjustment plate is threaded onto the outer wall of the second lead screw, and the adjustment plate and the auxiliary clamping plate are connected by a second spring.

[0012] Preferably, the number of teeth on one side of the tooth plate is equal to one-quarter of the number of teeth of the first gear.

[0013] Preferably, the protective plates abut against each other, one end of one of the protective plates is provided with a long plate, and the other end of the protective plate is provided with a corresponding sliding groove.

[0014] Preferably, the horizontal height of one end of the synchronization bar is higher than the horizontal height of the other end, and the distance difference between the two ends of the synchronization bar is less than the distance between the two ends of the drive block.

[0015] Preferably, a blocking plate is installed on the side of the auxiliary clamping plate near the second spring, and the blocking plate is disposed on the periphery of the second spring.

[0016] A welding method for a positioning welding device used for pipe welding, the specific implementation method includes the following steps:

[0017] Step 1: Place the pipe to be welded on top of the support plate and clamp it in place using the pipe clamping device;

[0018] Step 2: Start the motor so that it drives the first lead screw to rotate. The first lead screw drives the bearing plate to move away from the motor, and the bearing plate then drives the pipe to move.

[0019] Step 3: As the bearing plate moves, it drives the toothed plate to move. When the toothed plate abuts against the first gear, the toothed plate drives the first gear to rotate, the first gear drives the first bevel gear to rotate, the first bevel gear drives the second bevel gear to rotate, the second bevel gear then drives the synchronizing rod to rotate, and the synchronizing rod drives the protective plate to rotate, so that the protective plates abut against each other, preventing a large number of sparks generated during pipe welding from splashing onto the surface of the first lead screw and causing damage to the first lead screw;

[0020] Step 4: As the protective plate rotates, it drives the drive block to rotate, causing the drive block to move into the synchronous groove and abut against the synchronous bar. The drive block drives the synchronous bar to move closer to the first spring, causing the first spring to undergo elastic deformation and accumulate elastic potential energy. When one end of the synchronous bar moves to stop and block the auxiliary clamping plate, the second spring releases its elastic potential energy and undergoes elastic deformation, pushing the auxiliary clamping plate against one side of the pipe. At the same time, the bearing plate abuts against one side of the first drive rack and drives the first drive rack to move closer to the second gear. The first drive rack drives the second gear to rotate, and the second gear drives the second drive rack to rotate, causing the second drive rack to drive another auxiliary clamping plate and the fixing box to move, so that the other fixing box abuts against the other side of the pipe, thereby further stabilizing the pipe.

[0021] Step 5: Perform welding operations on the pipes;

[0022] Step 6: When the pipe volume is large, the adjusting handle can be rotated to drive the second lead screw to rotate. The second lead screw drives the fixed box to move away from the adjusting handle. The adjusting handle squeezes the second lead screw, causing the second lead screw to undergo elastic deformation, accumulating elastic potential energy, and increasing the movement distance of the auxiliary clamping plate, thereby maintaining the clamping effect on the pipe.

[0023] The advantages of this invention are:

[0024] By constructing a linkage transmission chain from components such as toothed plates, gears, bevel gears, and synchronizing rods, the spark protection mechanism triggered by the movement of the bearing plate during the welding preparation stage is self-synchronized and closed. This structure can achieve self-response without the need for additional sensing or electrical control systems, effectively preventing thermal damage to the core transmission components caused by metal spatter during welding. It significantly improves the equipment's anti-interference capability and adaptability to high-temperature conditions, breaking through the limitations of existing welding fixtures' spark shielding function, which relies on manual or external control.

[0025] The mechanism consists of a drive block, a synchronization bar, an auxiliary clamping plate, and other components, forming an adaptive clamping control mechanism with elastic prestress. While achieving the clamping action of the pipe workpiece, it retains the dynamic adjustment capability of the adjustable clamping distance and clamping pressure distribution. It is suitable for various pipe parts with different diameters, wall thicknesses, and deformation degrees. It provides a dynamically adaptable clamping response for the stability of the pipe body in the heat-affected zone of the weld, which helps to control the positioning accuracy and compensate for thermal deformation during the welding process.

[0026] By establishing a time-coordinated linkage between the carrier plate's movement, clamping action, and protection action, the system not only reduces its dependence on the synchronization of multi-axis control, thus lowering equipment complexity and the burden on the control system, but also shortens the pre-adjustment time before pipe type change welding, improving cycle efficiency and task response capability in multi-batch automated welding scenarios. It is especially suitable for automated pipe welding lines with multi-size switching in fields such as petrochemicals, power, and rail transportation. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0029] Figure 2 This is a schematic cross-sectional view of the protective component of the present invention;

[0030] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0031] Figure 4 This is a schematic cross-sectional view of the adjustment component of the present invention;

[0032] Figure 5 For the present invention Figure 4 Enlarged view of point B in the middle;

[0033] Figure 6 This is a schematic cross-sectional view of the drive component of the present invention;

[0034] Figure 7 For the present invention Figure 6 A magnified view of point C in the middle.

[0035] In the diagram: 100, workbench; 101, bearing plate; 102, pipe clamping device; 103, first lead screw; 104, motor; 200, protection component; 201, gear plate; 202, first gear; 203, first bevel gear; 204, second bevel gear; 205, synchronizing rod; 206, protection plate; 300, drive component; 301, drive block; 302, synchronizing groove; 303, synchronizing bar; 304, first spring; 305, first drive rack; 306, second gear; 307, second drive rack; 308, moving table; 400, auxiliary component; 401, auxiliary clamping plate; 402, second spring; 403, fixing box; 500, adjusting component; 501, adjusting handle; 502, second lead screw; 503, adjusting plate. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1

[0038] Please see Figure 1-7 As shown, a positioning welding device for pipe welding includes a worktable 100; a support plate 101 is slidably mounted on the top of the worktable 100, and pipe clamping devices 102 are symmetrically mounted on the top of the support plate 101; a first lead screw 103 is threadedly mounted on the bottom of the support plate 101; one end of the first lead screw 103 passes through the worktable 100 and extends to one side of the worktable 100; a motor 104 is fixedly mounted on the end of the first lead screw 103 extending to one side of the worktable 100; and a protective component 200 for preventing sparks from damaging the first lead screw 103 is provided at the bottom of the support plate 101.

[0039] The protection component 200 includes a toothed plate 201 disposed at the bottom end of the support plate 101. Two toothed plates 201 are symmetrically installed. A first gear 202 is meshed on one side of each toothed plate 201. The first gear 202 is rotatably mounted on the bottom end of the workbench 100. A first bevel gear 203 is fixedly installed at the bottom end of each first bevel gear 202. A second bevel gear 204 is meshed on one side of each first bevel gear 203. A synchronizing rod 205 is fixedly installed on the side of each second bevel gear 204 away from the first bevel gear 203. A protection plate 206 is fixedly installed at the other end of each synchronizing rod 205. A drive component 300 is disposed on one side of each protection plate 206. By setting the protection component 200, when passing through the support plate 101, the first gear 201 is protected. When moving the pipeline, the bearing plate 101 drives the toothed plate 201 to move, which in turn drives the protective plate 206 to rotate through the first gear 202, the first bevel gear 203, the second bevel gear 204 and the synchronizing rod 205. This causes the protective plates 206 to abut against each other, forming a barrier plate. This avoids the problem that when welding the pipeline, the first lead screw 103 is more likely to generate a large number of sparks compared to other materials, which would cause the sparks to splash onto the surface of the first lead screw 103 and damage it. This would affect the movement of the bearing plate 101 and reduce the welding efficiency. The reduced impact of sparks generated during welding on the first lead screw 103 extends the working life of the first lead screw 103 and improves the working efficiency of the device.

[0040] A welding method for a positioning welding device used for pipe welding, the specific implementation method includes the following steps:

[0041] Step 1: Place the pipe to be welded on the top of the support plate 101 and clamp and fix it using the pipe clamping device 102;

[0042] Step 2: Start the motor 104, so that the motor 104 drives the first lead screw 103 to rotate, the first lead screw 103 drives the bearing plate 101 to move away from the motor 104, and the bearing plate 101 then drives the pipe to move.

[0043] Step 3: As the bearing plate 101 moves, it drives the toothed plate 201 to move. When the toothed plate 201 abuts against the first gear 202, the toothed plate 201 drives the first gear 202 to rotate. The first gear 202 drives the first bevel gear 203 to rotate. The first bevel gear 203 drives the second bevel gear 204 to rotate. The second bevel gear 204 then drives the synchronizing rod 205 to rotate. The synchronizing rod 205 drives the protective plate 206 to rotate, so that the protective plates 206 abut against each other, preventing a large number of sparks generated during pipe welding from splashing onto the surface of the first lead screw 103 and causing damage to the first lead screw 103.

[0044] Step 4: As the protective plate 206 rotates, it drives the drive block 301 to rotate, causing the drive block 301 to move into the synchronous groove 302 and abut against the synchronous bar 303. The drive block 301 drives the synchronous bar 303 to move closer to the first spring 304, causing the first spring 304 to undergo elastic deformation and accumulate elastic potential energy. When one end of the synchronous bar 303 moves to stop and block the auxiliary clamping plate 401, the second spring 402 releases its elastic potential energy and undergoes elastic deformation, pushing the auxiliary clamping plate 401 to abut against one side of the pipe. At the same time, the bearing plate 101 abuts against one side of the first drive rack 305 and drives the first drive rack 305 to move closer to the second gear 306. The first drive rack 305 drives the second gear 306 to rotate, and the second gear 306 drives the second drive rack 307 to rotate, causing the second drive rack 307 to drive another auxiliary clamping plate 401 and the fixing box 403 to move, so that the other fixing box 403 abuts against the other side of the pipe, thereby further stabilizing the pipe.

[0045] Step 5: Perform welding operations on the pipes;

[0046] Step 6: When the pipe volume is large, the adjusting handle 501 can be rotated to drive the second lead screw 502 to rotate. The second lead screw 502 drives the fixed box 403 to move away from the adjusting handle 501. The adjusting handle 501 squeezes the second lead screw 502, causing the second lead screw 502 to undergo elastic deformation, accumulate elastic potential energy, and increase the moving distance of the auxiliary clamping plate 401, thereby maintaining the clamping effect on the pipe.

[0047] Example 2

[0048] Please see Figure 1-2 , Figure 4-7As shown in the comparison with Embodiment 1, as another embodiment of the present invention, the drive assembly 300 includes drive blocks 301 disposed on one side of the protective plate 206. Each drive block 301 is slidably mounted on the inner wall of the synchronization groove 302, which is located at the top of the support plate 101. One end of each drive block 301 abuts against a synchronization bar 303, which is slidably mounted on the inner wall of the synchronization groove 302. A first spring 304 is installed at the bottom end of each synchronization bar 303. A first drive rack 305 is slidably mounted on the end of the worktable 100 away from the motor 104. A second gear 306 is meshed on one side of the first drive rack 305. A second drive rack 307 is meshed on the side of the second gear 306 away from the first drive rack 305. A movable [unclear - possibly a device or mechanism] is fixedly mounted at the top of the second drive rack 307. Auxiliary components 400 are provided at one end of the moving table 308, one end of the synchronization bar 303, and the top of the moving table 308. By setting the drive component 300, when the support plate 101 drives the protection component 200 to operate, the protection plate 206 drives the drive block 301 to rotate, and the support plate 101 drives the first drive rack 305 to move, thereby driving the auxiliary component 400 to operate. When welding ends, when the motor 104 drives the support plate 101 to reset, the auxiliary component 400 automatically releases its auxiliary fixing effect on the pipeline. This avoids the problem of complicated procedures when the auxiliary component 400 needs to be manually operated, and the problem of reduced work efficiency when waiting for the auxiliary component 400 to cool down before resetting after welding. This reduces the number of operation steps and improves work efficiency.

[0049] Please see Figure 1-2 , Figure 4-7 As shown, the auxiliary component 400 includes an auxiliary clamping plate 401 disposed at one end of the synchronization bar 303 or at the top of the moving table 308. Fixing boxes 403 are slidably mounted on the periphery of the auxiliary clamping plate 401. One fixing box 403 is fixedly mounted at the top of the support plate 101, and the other fixing box 403 is fixedly mounted at the top of the moving table 308. A second spring 402 is mounted on one side of each auxiliary clamping plate 401, and an adjusting component 500 is disposed on one side of each fixing box 403. By setting the auxiliary component 400, when the support plate 101 moves to the end of the worktable 100 away from the motor 104, the protective plate 20... 6 drives the drive block 301 to move, and the drive block 301 abuts against the timing bar 303, so that the drive block 301 drives the auxiliary clamping plate 401 to abut against one side of the pipe through the timing bar 303 and the second spring 402. At the same time, the bearing plate 101 drives the first drive rack 305 to move, so that the first drive rack 305 drives another auxiliary clamping plate 401 to move to the other side of the pipe through the second gear 306, the second drive rack 307, the fixing box 403 and the second spring 402, thereby further clamping and fixing the pipe, making the pipe more stable in the welding operation, thereby improving the welding effect of the pipe.

[0050] Please see Figure 4-7 As shown, the adjustment assembly 500 includes an adjustment handle 501 disposed on one side of the fixed box 403. A second lead screw 502 is fixedly installed on one side of the adjustment handle 501. One end of the second lead screw 502 passes through the fixed box 403 and extends to one side of the fixed box 403. An adjustment plate 503 is threadedly installed on the outer wall of the second lead screw 502. The adjustment plate 503 and the auxiliary clamping plate 401 are connected by a second spring 402. By setting the adjustment assembly 500, when the pipe volume is small, the adjustment handle 501 can be rotated to compress the second spring 402 through the second lead screw 502 and the adjustment plate 503, increasing the initial elastic potential energy of the second spring 402 and increasing the moving distance of the auxiliary clamping plate 401. This avoids the situation where the moving distance of the auxiliary clamping plate 401 is short when the pipe volume is small, which can easily reduce the clamping effect on the pipe and thus reduce the welding effect of the pipe. This improves the applicability of the device and increases the clamping effect of the device, thereby improving the welding effect of the pipe.

[0051] Please see Figure 2-3 As shown, the number of teeth on one side of the toothed plate 201 is equal to one-quarter of the number of teeth of the first gear 202. When the bearing plate 101 abuts against the end of the worktable 100 away from the motor 104, the toothed plate 201 drives the first gear 202 to rotate one-quarter of a turn. This causes the first gear 202 to drive the protective plate 206 to rotate ninety degrees through the first bevel gear 203, the second bevel gear 204, and the synchronizing rod 205. This avoids the problem that when the toothed plate 201 has fewer teeth, there will be a gap at the bottom of the protective plate 206 when it abuts, which would cause sparks generated during welding to easily pass through the barrier plate formed by the protective plate 206 and splash onto the surface of the first lead screw 103, causing damage to the first lead screw 103. When the toothed plate 201 has more teeth, it is easy to cause movement interference between the auxiliary clamping plates 401, affecting the overall operation of the device. This improves the stability and reliability of the device.

[0052] Please see Figure 1-2 , Figure 4-6 As shown, the protective plates 206 abut against each other. One end of one protective plate 206 is provided with a long plate, and the other end of the other protective plate 206 is provided with a corresponding groove. When the protective plates 206 rotate, the long plate can rotate on the inner wall of the groove, which avoids the protective plates 206 from easily abutting against each other when rotating in opposite directions, causing motion interference and creating gaps. This prevents sparks generated during pipe welding from easily splashing onto the surface of the first lead screw 103 through the gaps, thereby damaging the first lead screw 103 and affecting the movement of the bearing plate 101. This improves the stability and reliability of the device.

[0053] Please see Figure 4-5As shown, the horizontal height of one end of the synchronization bar 303 is higher than that of the other end, and the distance difference between the two ends of the synchronization bar 303 is less than the distance between the two ends of the drive block 301. Before welding preparation, the higher end of the synchronization bar 303 can prevent the auxiliary clamping plate 401 from moving away from the second spring 402. When the protective plates 206 abut against each other to form a barrier, the higher end of the synchronization bar 303 moves completely into the synchronization groove 302, stopping the limiting effect on the auxiliary clamping plate 401. This avoids the problem that when the higher end of the synchronization bar 303 is too high, after the protective plate 206 forms a barrier, the synchronization bar 303 still limits the auxiliary clamping plate 401, making it difficult for the auxiliary clamping plate 401 to move to the side of the pipe, thus reducing the auxiliary clamping effect of the auxiliary component 400. This improves the auxiliary clamping effect of the auxiliary component 400 and enhances the reliability and stability of the device.

[0054] Please see Figure 4-5 As shown, a baffle plate is installed on the side of the auxiliary clamping plate 401 near the second spring 402. The baffle plate is located around the second spring 402. When the auxiliary clamping plate 401 abuts against one side of the pipe, the baffle plate can protect the second spring 402, avoiding the problem that a large number of sparks are easily generated during the welding operation of the pipe, causing sparks to splash onto the surface of the second spring 402 and damage it, thus reducing the service life of the second spring 402 and improving its service life.

[0055] Working principle: When welding is required, the pipe to be welded is placed on top of the support plate 101 and clamped and fixed by the pipe clamping device 102. The motor 104 is started, causing the motor 104 to drive the first lead screw 103 to rotate. The first lead screw 103 drives the support plate 101 to move away from the motor 104. The support plate 101 then drives the pipe to move. At the same time, the support plate 101 drives the toothed plate 201 to move. When the toothed plate 201 abuts against the first gear 202, the toothed plate 201 drives the first gear 202 to rotate. The first gear 202 drives the first bevel gear 203 to rotate. The first bevel gear 203 drives the second bevel gear 204 to rotate. The second bevel gear 204 then drives the synchronizing rod 205 to rotate. The synchronizing rod 205 drives the protective plate 206 to rotate, so that the protective plates 206 abut against each other, preventing a large amount of sparks generated during pipe welding from splashing onto the surface of the first lead screw 103 and causing damage to it. At the same time, the protective plate 206 drives the drive block. Rotation of 301 causes the drive block 301 to move into the synchronization groove 302 and abut against the synchronization bar 303. The drive block 301 drives the synchronization bar 303 to move closer to the first spring 304, causing the first spring 304 to undergo elastic deformation and accumulate elastic potential energy. When one end of the synchronization bar 303 moves to the stop blocking auxiliary clamping plate 401, the second spring 402 releases elastic potential energy and undergoes elastic deformation, pushing the auxiliary clamping plate 401 to abut against one side of the pipe. At the same time, the bearing plate 101 abuts against one side of the first drive rack 305 and drives the first drive rack 305 to move closer to the second gear 306. The first drive rack 305 drives the second gear 306 to rotate, and the second gear 306 drives the second drive rack 307 to rotate, causing the second drive rack 307 to drive another auxiliary clamping plate 401 and the fixing box 403 to move, so that the other fixing box 403 abuts against the other side of the pipe, thereby further stabilizing the pipe. At this time, welding operations are performed on the pipe.

[0056] When the pipe volume is large, the adjusting handle 501 can be rotated to drive the second lead screw 502 to rotate. The second lead screw 502 drives the fixed box 403 to move away from the adjusting handle 501. The adjusting handle 501 squeezes the second lead screw 502, causing the second lead screw 502 to undergo elastic deformation, accumulate elastic potential energy, and increase the moving distance of the auxiliary clamping plate 401, thereby maintaining the clamping effect on the pipe.

[0057] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0058] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A positioning welding device for pipe welding, characterized in that, The utility model relates to a worktable, which comprises a worktable (100), a bearing plate (101) slidingly installed at the top end of the worktable (100), a pipe clamping device (102) symmetrically installed at the top end of the bearing plate (101), a first lead screw (103) screwedly installed at the bottom end of the bearing plate (101), one end of the first lead screw (103) penetrating through the worktable (100) and extending to one side of the worktable (100), a motor (104) fixedly installed at the end of the first lead screw (103) extending to one side of the worktable (100), and a protection assembly (200) provided at the bottom end of the bearing plate (101) for preventing sparks from damaging the first lead screw (103). The protection assembly (200) comprises two toothed plates (201) provided at the bottom end of the bearing plate (101), the toothed plates (201) are symmetrically installed, a first gear (202) is engagedly installed on one side of each toothed plate (201), the first gears (202) are rotationally installed at the bottom end of the worktable (100), a first bevel gear (203) is fixedly installed at the bottom end of each first gear (202), a second bevel gear (204) is engagedly installed on one side of each first bevel gear (203), a synchronous rod (205) is fixedly installed on the side of each second bevel gear (204) away from the first bevel gear (203), a protection plate (206) is fixedly installed at the other end of each synchronous rod (205), and a driving assembly (300) is provided on one side of each protection plate (206). The driving assembly (300) comprises a driving block (301) provided on one side of each protection plate (206), the driving blocks (301) are slidingly installed on the inner wall of a synchronous groove (302), the synchronous groove (302) is formed in the top end of the bearing plate (101), a synchronous strip (303) is abutted on one end of each driving block (301), the synchronous strips (303) are slidingly installed on the inner wall of the synchronous groove (302), and a first spring (304) is installed at the bottom end of each synchronous strip (303). A first driving rack (305) is slidingly installed at the end of the worktable (100) away from the motor (104), a second gear (306) is engagedly installed on one side of the first driving rack (305), a second driving rack (307) is engagedly installed on the side of the second gear (306) away from the first driving rack (305), a moving table (308) is fixedly installed at the top end of the second driving rack (307), and an auxiliary assembly (400) is provided on one end of each synchronous strip (303) and the top end of the moving table (308). ​ The auxiliary assembly (400) comprises an auxiliary clamping plate (401) arranged at one end of the synchronous bar (303) or the top end of the moving table (308), slidingly mounted with fixing boxes (403) on the circumferential side of the auxiliary clamping plate (401), one of the fixing boxes (403) is fixedly installed at the top end of the bearing plate (101), the other fixing box (403) is fixedly installed at the top end of the moving table (308), one side of the auxiliary clamping plate (401) is installed with a second spring (402), and one side of the fixing box (403) is provided with an adjusting assembly (500).

2. A positioning welding device for pipe welding according to claim 1, characterized in that: The adjusting assembly (500) comprises an adjusting handle (501) arranged on one side of the fixing box (403), and one side of the adjusting handle (501) is fixedly installed with a second lead screw (502), one end of the second lead screw (502) penetrates through the fixing box (403) and extends to one side of the fixing box (403), and the outer wall of the second lead screw (502) is screwedly installed with an adjusting plate (503), and the adjusting plate (503) and the auxiliary clamping plate (401) are connected through the second spring (402).

3. A positioning welding device for pipe welding according to claim 1, characterized in that: The number of teeth on one side of the toothed plate (201) is equal to one fourth of the number of teeth of the first gear (202).

4. A positioning welding device for pipe welding according to claim 1, characterized in that: The protection plates (206) abut against each other, and one end of one of the protection plates (206) is provided with a long plate, and one end of the other protection plate (206) is correspondingly provided with a sliding groove.

5. A positioning welding device for pipe welding according to claim 1, characterized in that: The horizontal height of one end of the synchronous bar (303) is higher than that of the other end, and the distance difference between the heights of the two ends of the synchronous bar (303) is smaller than the distance between the two ends of the driving block (301).

6. A positioning welding device for pipe welding according to claim 1, characterized in that: The auxiliary clamping plate (401) is installed with a blocking plate on the side close to the second spring (402), and the blocking plate is arranged on the circumferential side of the second spring (402).

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