A welding auxiliary device for sand prevention filter screen pipe of petroleum

Abstract

The utility model discloses a kind of welding auxiliary devices for petroleum sand prevention filter screen pipe, for cooperating with welding robot to carry out the welding of petroleum sand prevention filter screen pipe, comprising: auxiliary machine tool, slide rail is provided thereon;Feeding and discharging frame, for placing pipe fittings, the feeding and discharging frame is set to the both sides of the auxiliary machine tool;Automatic material turning mechanism, for driving pipe fittings lifting and overturning;Automatic jacking mechanism, for jacking pipe fittings.By the above mode, a kind of welding auxiliary devices for petroleum sand prevention filter screen pipe of the utility model can realize one-key automatic material turning and one-key automatic jacking function in production process, so that pipe fittings can be freely transmitted, lifted and processed, realize assembly line production, thereby significantly improve production efficiency, so that processing becomes faster and safer, and while improving capacity, product quality can also be improved, reduce raw material waste, save production cost.

Description

Technical Field

[0001] This utility model relates to the technical field of oil sand control and filter screen tube processing equipment, and in particular to a welding auxiliary device for oil sand control and filter screen tubes. Background Technology

[0002] In recent years, with the continuous development of the global economy, energy demand will continue to grow. As one of the main energy sources, oil production and consumption are also increasing globally, and transportation demand will also increase accordingly. Therefore, the demand for oil pipeline fittings is increasing. The global market size for oil pipeline infrastructure is expected to reach US$110 billion in 2024.

[0003] Metal mesh filter pipes account for a large proportion of transportation equipment in the petroleum, energy, and other industries. Compared with other types of filter pipes, metal mesh filter pipes have excellent characteristics such as strong adaptability, relatively low cost, and good repairability. Therefore, metal mesh filter pipes are becoming increasingly popular in the market.

[0004] However, with the increasing demand for metal mesh filter tubes, the shortcomings of previous processing techniques have gradually become apparent, mainly as follows: 1. Currently, when welding metal mesh onto pipe fittings, it is still necessary to manually move the pipe fittings to the welding position and flip them over. Then, the welded pipe fittings are unloaded manually. This method is extremely inefficient and cannot achieve proper positioning of the pipe fittings, thus affecting the welding efficiency. 2. The inability to precisely fix the pipe fittings and metal mesh, and the inability to adapt to long welding operations of pipe fittings of different lengths, makes it easy for the metal mesh to shift or detach during welding, thereby reducing welding efficiency and pipe fitting yield. Utility Model Content

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A welding auxiliary device is provided for oilfield sand control filter screen pipes, used in conjunction with a welding robot for welding oilfield sand control filter screen pipes, comprising: Auxiliary machine tool, which is equipped with slide rails; Loading and unloading racks are used to place pipe fittings, and the loading and unloading racks are arranged on both sides of the auxiliary machine tool; An automatic tipping mechanism is used to drive the lifting and flipping of pipe fittings. It includes a tipping base, a lifting plate, an inclined tipping plate, a bracket, and a blocking block. The tipping base is movably connected to the slide rail. The lifting plate is movably mounted on the tipping base. The inclined tipping plate is fixedly connected to the top of the lifting plate. The height of the inclined tipping plate gradually decreases from the feeding direction to the discharging direction, so as to drive the pipe fittings to flip in a specified direction. The bracket is fixedly connected to the side of the inclined tipping plate. The blocking block is movably connected to the bracket. The blocking block flips up and down on the bracket under the drive of a lever cylinder, so as to block the pipe fittings on the inclined tipping plate or release the pipe fittings. An automatic clamping mechanism for clamping pipe fittings includes a pipe fitting support assembly, a movable clamping assembly, and a misalignment linkage assembly. Two sets of the movable clamping assemblies are arranged opposite to each other on an auxiliary machine tool, and at least one set of the movable clamping assemblies is movably connected to the auxiliary machine tool via a slide rail to clamp both ends of the pipe fitting. Several sets of pipe fitting support assemblies are located between the two sets of movable clamping assemblies, and the pipe fitting support assemblies are slidably connected to the auxiliary machine tool via the slide rail to support and position the pipe fitting. The movable clamping assembly movably connected to the auxiliary machine tool is connected to the adjacent pipe fitting support assembly via the misalignment linkage assembly, so that the pipe fitting support assembly moves with the movable clamping assembly.

[0006] In a preferred embodiment of the present invention, the automatic material turning mechanism further includes a material turning and lifting cylinder, which is disposed on the material turning base and drives the lifting plate to move up and down.

[0007] In a preferred embodiment of the present invention, the two ends of the lifting plate extend toward the upper and lower material racks on both sides, so that the lifting plate and the upper and lower material racks partially overlap in the horizontal direction.

[0008] In a preferred embodiment of the present invention, the top surface of the lifting plate is provided with a plurality of inclined tilting plates connected end to end.

[0009] In a preferred embodiment of the present invention, the blocking block is rotatably mounted on the top of the bracket via a rotating shaft. A lever cylinder mounted on the bracket or lifting plate is movably connected to one end of the blocking block to drive the blocking block to rotate axially around the rotating shaft, so that the other end of the blocking block swings upward above the inclined tilting plate to block the pipe.

[0010] In a preferred embodiment of this utility model, the flipping base is provided with a plurality of quick clamps, and a pressing block is fixedly connected to the bottom of the pressing rod in the quick clamp. The quick clamp drives the pressing block to move up and down to abut or move away from the top surface of the auxiliary machine tool, thereby realizing the locking and unlocking of the automatic flipping mechanism.

[0011] In a preferred embodiment of this utility model, the pipe support assembly includes a support base, a pipe support seat, a V-shaped roller, and a lifting mechanism. The V-shaped roller is rotatably disposed within the pipe support seat to support the pipe and position it within the V-shaped roller. The lifting mechanism drives the pipe support seat to move up and down to adjust the height of the V-shaped roller according to the processing requirements of pipes with different diameters.

[0012] In a preferred embodiment of the present invention, the movable clamping assembly includes a movable platform, a conical top, and a telescopic drive mechanism. The movable platform is connected to the auxiliary machine tool, the conical top is movably connected to the movable platform, and the telescopic drive mechanism drives the conical top to perform telescopic movement, thereby clamping or loosening the pipe fitting.

[0013] In a preferred embodiment of the present invention, in the two sets of movable clamping assemblies, a rotary drive mechanism that drives the cone to rotate is provided on the movable platform of one set of movable clamping assemblies, and a push-pull drive mechanism is connected to the movable platform of the other set of movable clamping assemblies. The push-pull drive mechanism drives the movable platform to move back and forth on the auxiliary machine tool.

[0014] In a preferred embodiment of this utility model, the misaligned linkage assembly includes a first rod and a second rod. The outer end of one of the first rod and the second rod is fixedly connected to a movable platform, and the outer end of the other rod is fixedly connected to a support base. The inner ends of the first rod and the second rod are staggered, and a movable guide groove is provided on the first rod or the second rod. A limiting rod is fixedly connected to the second rod or the first rod. The limiting rod is movably connected to the movable guide groove to adjust the extension and retraction of the first rod and the second rod.

[0015] The beneficial effects of this utility model are: it can realize one-click automatic material turning and one-click automatic clamping functions in the production process, so that the pipe fittings can be freely transported, lifted and processed, realizing assembly line production, thereby significantly improving production efficiency, making processing faster and safer, and improving product quality while increasing production capacity, reducing raw material waste and saving production costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. 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 a preferred embodiment of a welding auxiliary device for oil sand control and filtration screen pipe according to the present invention. Figure 2 This is a schematic diagram of a preferred embodiment of a welding auxiliary device for oil sand control and filtration screen pipe according to the present invention. Figure 3 This is a schematic diagram of the automatic material turning mechanism in a preferred embodiment of a welding auxiliary device for oil sand control and filter screen pipe of this utility model. Figure 4 This is a schematic diagram of the automatic clamping mechanism in a preferred embodiment of a welding auxiliary device for oil sand control and filter screen pipe of this utility model. Figure 5 This is a bottom view of the automatic clamping mechanism in a preferred embodiment of a welding auxiliary device for oil sand control and filter screen pipe of this utility model. Figure 6 This is a schematic diagram of the cone top structure in a preferred embodiment of a welding auxiliary device for oil sand control and filtration screen pipe according to the present invention. Detailed Implementation

[0017] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] Please see Figure 1-6 The embodiments of this utility model include: A welding auxiliary device for oilfield sand control filter screens is used to cooperate with welding robots to flip, tighten, and load / unload oilfield sand control filter screens (hereinafter referred to as pipe fittings 10) to achieve assembly line production. Its structure includes: an auxiliary machine tool 1, a loading / unloading rack 12, an automatic flipping mechanism 2, and an automatic tightening mechanism 3. The auxiliary machine tool is equipped with a slide rail 11. The loading / unloading rack 12 is set on both sides of the auxiliary machine tool 1 to store pipe fittings 10 to be welded or welded. The automatic flipping mechanism 2 is fixed or movably set on the auxiliary machine tool 1 via a movable slide rail to drive the pipe fittings 10 to be lifted and flipped. Two sets of automatic tightening mechanisms 3 are arranged opposite to each other on the auxiliary machine tool 1 on the front and rear sides of the automatic flipping mechanism 2, and at least one set of automatic tightening mechanisms 3 is slidably connected to the slide rail 11 on the auxiliary machine tool 1 to position and tighten the pipe fittings 10 to be welded.

[0019] In some embodiments of this application, two sets of welding robots 13 are arranged between two adjacent sets of auxiliary machine tools. During welding, the two sets of welding robots 13 respectively weld the two ends of the pipe fitting 10.

[0020] Furthermore, a shared loading and unloading rack 12 is provided between the two adjacent sets of auxiliary machine tools 1.

[0021] In some embodiments of this application, a set of loading and unloading racks 12 includes multiple parallel pipe racks to provide more stable load-bearing capacity.

[0022] Furthermore, each set of auxiliary machine tools 1 is connected to two sets of pneumatic tilting mechanisms 2. The two sets of pneumatic tilting mechanisms 2 are set at intervals, and the specific interval can be adjusted in real time according to the length of the pipe 10 to provide more stable support.

[0023] In some embodiments of this application, one set of automatic clamping mechanisms 3 is fixed on the auxiliary machine tool 1, and another set of automatic clamping mechanisms 3 moves back and forth along the slide rail 11 to adjust the position in real time according to the length of the pipe 10 for clamping.

[0024] (1) Automatic material turning mechanism The automatic material turning mechanism 2 includes a material turning base 21, a material turning lifting cylinder 22, a lifting plate 23, a lifting guide column 24, an inclined material turning plate 25, a bracket 26, a blocking block 27, a rotating shaft 28, and a lever cylinder 29.

[0025] The tilting base 21 is connected to the auxiliary machine tool 1. The tilting lifting cylinder 22 is set on the tilting base 21, and its output end is connected to the lifting plate 23 to drive the lifting plate 23 to move up and down. The two ends of the lifting plate 23 extend towards the upper and lower material racks 12 on both sides, so that the lifting plate 23 and the upper and lower material racks 12 partially overlap in the horizontal direction to prevent the pipe 10 from leaking through the gap due to the gap between the lifting plate 23 and the upper and lower material racks 12 in the horizontal direction. The top surface of the lifting plate 23 is provided with multiple inclined tilting plates 25 connected end to end, and the height of each inclined tilting plate 25 gradually decreases from the feeding direction to the discharging direction to drive the pipe 10 to flip and roll in the specified direction.

[0026] The bracket 26 is fixedly connected to the lifting plate 23. The blocking block 27 is rotatably mounted on the top of the bracket 26 via the rotating shaft 28. The output end of the lever cylinder 29 mounted on the bracket 26 or the lifting plate 23 is movably connected to the end of the blocking block 27 near the feeding direction, so as to drive the blocking block 27 to rotate axially around the rotating shaft 28, causing the other end of the blocking block 27 near the discharge direction to swing up and down, thereby blocking and limiting the pipe 10 on the inclined tilting plate 25 or releasing the pipe 10.

[0027] Furthermore, the bottom surface of the flipping base 21 is provided with a slider 211 that is movably connected to the slide rail. The slider 211 is fixed to the bottom surface of both sides of the flipping base 21 by screws.

[0028] Furthermore, the upper end of the guide post 24 is fixedly connected to the lifting plate 23, and its lower end is movably connected to the ball bearing guide sleeve 210 on the tilting base 21, so as to improve the stability of the lifting movement of the lifting plate 23.

[0029] In some embodiments of this application, the tilting plate 25 and the lifting plate 23 are an integral structure.

[0030] In some other embodiments of this application, the tilting plate 25 is fixedly connected to the lifting plate 23 by screws.

[0031] Furthermore, the flipping base 21 is provided with several quick clamps 212. The bottom of the pressure bar in the quick clamp 212 is fixedly connected to a clamping block 213. The quick clamp 212 drives the clamping block 213 to move up and down to abut or move away from the top surface of the auxiliary machine tool 1, thereby realizing the locking and unlocking of the automatic flipping mechanism.

[0032] In some embodiments of this application, a horizontal quick clamp is provided on each side of the flipping base 21, and the two horizontal quick clamps are arranged diagonally.

[0033] Before welding, adjust the position or spacing of the automatic flipping mechanism according to the length of the pipe fitting. Then, rotate the quick clamp to drive the clamping block to press against the auxiliary machine tool to lock the position of the automatic flipping mechanism.

[0034] When welding is required on the pipe fittings, the pipe fittings move from the upstream loading / unloading rack towards the automatic tipping mechanism, either manually or with existing automatic feeding equipment such as conveyor belts or pushing mechanisms. At the same time, the tipping lifting cylinder drives the lifting plate to rise (at this time, the blocking block is in a tilted state) to lift the pipe fittings so that they can fall onto the inclined tipping plate. Due to the inclined angle of the tipping plate, the pipe fittings will automatically roll along the inclined tipping plate in the designated direction until they reach the target position and are blocked by the blocking block. The tipping lifting cylinder then drives the lifting plate to fall, so that the pipe fittings fall onto the automatic clamping mechanism, which then works with the welding robot to perform welding.

[0035] After welding is completed, the tilting and lifting cylinder lifts the pipe again through the lifting plate, so that the pipe first gets off the automatic clamping mechanism and then moves to the target height (level with or slightly higher than the loading and unloading rack). The lever cylinder is opened to drive the blocking block to flip to a horizontal state. Since there is no longer the restriction of the blocking block, the pipe will continue to roll down along the inclined tilting plate until the pipe falls on the loading and unloading rack downstream of the automatic tilting mechanism, thus completing the unloading.

[0036] In addition, when two inclined tilting plates are installed on the lifting plate, two pipe fittings can simultaneously fall on their corresponding inclined tilting plates (i.e., the first and second inclined tilting plates). Since there is a certain height difference at the connection point of two adjacent inclined tilting plates, this height difference can be used to restrict the pipe fittings closer to the loading direction. The pipe fittings located on the first inclined tilting plate closer to the unloading direction need to be restricted by blocking blocks to prevent the two pipe fittings from being close together. After the pipe fitting closer to the unloading direction has been welded, the tilting and lifting cylinder first lifts the two pipe fittings. After welding, the pipe fitting loses the effect of the blocking blocks and moves to the loading and unloading rack. The unwelded pipe fittings can move from the current second inclined tilting plate to the subsequent first inclined tilting plate under the action of manual or automatic feeding equipment and be blocked by blocking blocks. At the same time, a new unprocessed pipe fitting moves from the loading and unloading rack to the second inclined tilting plate, thus realizing assembly line production.

[0037] (2) Automatic tightening mechanism In a set of automatic clamping mechanisms connected to an auxiliary machine tool, the structure includes a pipe support assembly 31, a misaligned linkage assembly 32, and a movable clamping assembly 33, wherein the pipe support assembly 31 is connected to the movable clamping assembly 33 via the misaligned linkage assembly 32.

[0038] The pipe support assembly 31 includes a support base 310, a pipe support seat 311, a V-shaped roller (bearing) 312, and a lifting mechanism 313. The V-shaped roller 312 is rotatably disposed in the pipe support seat 311 to support the pipe 10 and position the pipe 10 at the bottom of the V-groove of the V-shaped roller 312. The lifting mechanism 313 is disposed on the support base 310, and its top is connected to the pipe support seat 311 to drive the pipe support seat 311 to move up and down, thereby adjusting the height of the V-shaped roller 312 according to the processing requirements of pipes of different diameters.

[0039] Furthermore, the bottom of the support base 310 is slidably connected to the slide rail 11 on the auxiliary machine tool 1 via a slider.

[0040] Furthermore, a guide rod 314 is connected to the bottom of the pipe support 311. The lower part of the guide rod 314 is movably connected to the support base 310 to improve the stability of the pipe support 311 during lifting. The top surface of the pipe support 311 is lower than the bottom of the V-groove in the V-roller 312 to prevent the pipe support 311 from interfering when the pipe 10 falls into the V-groove of the V-roller 312.

[0041] In some embodiments of this application, the lifting mechanism 313 includes a lifting cylinder, the output end of which is connected to the bottom surface of the pipe support.

[0042] In some other embodiments of this application, the lifting mechanism 313 includes a turbine, a worm gear 315, and a drive unit. The worm gear is vertically and rotatably connected to the support base. The top end of the worm gear is connected to the bottom surface of the pipe support seat. The turbine gear is rotatably connected to the support base via a rotating shaft and meshes with the worm gear. The turbine gear is connected to the drive unit. Under the action of the drive unit, the turbine gear rotates axially to drive the worm gear to move up and down, thereby causing the pipe support seat and the V-shaped roller to move up and down.

[0043] The drive unit can be an automatic drive device such as a motor, or a manual drive device such as a handwheel 316.

[0044] The movable clamping assembly 33 includes a movable stage 331, a push-pull drive mechanism 332, a cone top 333, and a telescopic drive mechanism 334.

[0045] The movable table 331 is connected to the auxiliary machine tool 1. The push-pull drive mechanism 332 is set on the auxiliary machine tool 1, and its output end is connected to the movable table 331 to drive the movable table 331 to move back and forth on the auxiliary machine tool 1, thereby achieving the effect of adjusting the position according to the length of the pipe fitting 10. The cone apex 333 is rotatably connected to the movable table 331. The telescopic drive mechanism 334 is connected to the cone apex 333 to drive the cone apex 333 to perform telescopic movement, thereby tightening or loosening the pipe fitting 10.

[0046] In some embodiments of this application, the bottom of the mobile stage is provided with a slider that is movably connected to the slide rail.

[0047] In some embodiments of this application, a sliding guide sleeve is provided inside the mobile stage and is movably connected to the rear of the cone apex.

[0048] In some embodiments of this application, the cone tip 333 adopts a standard rotatable cone tip, which includes a connecting part movably connected to the moving platform and a flexible conical head movably connected to the end of the pipe fitting, and the conical head is rotatably connected to the connecting part through a rotating shaft.

[0049] In the above embodiments of this application, among the two sets of automatic clamping mechanisms on the auxiliary machine tool 1, at least one set of automatic clamping mechanisms may have a conical head with an active rotation function. That is, a rotation drive mechanism needs to be connected to the rotation shaft of the conical head. For example, the rotation drive mechanism includes a transmission belt and a motor. The belt is wound around the rotation shaft and the output shaft of the motor. The transmission belt is driven by the motor to move, thereby realizing the rotation of the conical head.

[0050] The misaligned linkage assembly 32 includes a first rod 320 and a second rod 321. A rod is connected to both the moving platform 331 and the support base 310. A movable guide groove 322 is provided on either the first or second rod 320. A plurality of limiting rods 323 are fixedly connected to either the second or first rod 321. The limiting rods 323 are movably connected to the movable guide groove 322, allowing the limiting rods 323 to move back and forth within the movable guide groove 322 to adjust the misalignment length between the first rod 320 and the second rod 321, thereby realizing the extension and retraction of the first rod 320 and the second rod 321.

[0051] When a set of automatic clamping mechanisms is fixedly connected to an auxiliary machine tool, the structure of the pipe support assembly remains unchanged, and it can still move back and forth on the auxiliary machine tool. In the movable clamping assembly, the movable table is fixedly installed on the auxiliary machine tool by fasteners such as screws. At the same time, the staggered connection assembly can be eliminated to reduce costs. Other structures are the same as those of the automatic clamping mechanism that is movably connected to the auxiliary machine tool.

[0052] When the automatic clamping mechanism clamps, the push-pull drive mechanism pushes the moving platform closer to the end of the pipe. At this time, the misalignment linkage assembly gradually retracts (i.e., the degree of overlap between the two rods increases). The push-pull drive mechanism continues to push the moving platform. When the misalignment linkage assembly can no longer retract, the pipe support assembly is pushed forward under the action of the misalignment linkage assembly and the moving clamping assembly, causing the pipe support assembly to move to the bottom of the pipe and the cone apex to move closer to the end of the pipe. When the automatic flipping mechanism lowers the pipe to be welded, the pipe falls onto the V-shaped roller. The telescopic drive mechanism drives the cone apex to extend and clamp the end of the pipe to clamp it from both ends (at this time, the pipe can still contact the V-shaped roller). The welding robot begins to weld the pipe. At the same time, the rotation drive mechanism drives the cone apex to rotate, causing the pipe to rotate under the action of the cone apex, thus enabling the welding robot to complete the axial welding process.

[0053] When the welding is completed and the automatic clamping mechanism is in the open state, the telescopic drive mechanism drives the cone tip to retract, causing the cone tip to detach from the pipe fitting. At this time, the pipe fitting continues to be supported by the pipe fitting support assembly. The push-pull drive mechanism drives the moving table to retreat a certain distance away from the pipe fitting, so that the misalignment linkage assembly is fully pulled apart. The automatic tilting mechanism lifts up to support the pipe fitting (at this time, the blocking block rises to block the pipe fitting). At the same time, the push-pull drive mechanism continues to drive the moving table to retreat, so that the pipe fitting support assembly also retreats synchronously, so that the pipe fitting is completely disengaged from the moving clamping assembly. This will prevent operational accidents when tilting the pipe fitting in the next step. After the pipe fitting is lifted to the target position, the blocking block is moved to a horizontal state, and the pipe fitting falls along the inclined tilting plate onto the loading and unloading rack for unloading.

[0054] The automatic clamping mechanism can automatically clamp and loosen pipe fittings during the production process, thereby accurately and efficiently realizing the positioning, fixing and separation functions of pipe fittings. Moreover, it can be remotely controlled, reducing manual operation, improving safety, and facilitating automated production line production.

[0055] The beneficial effects of this utility model for a welding auxiliary device for oilfield sand control filter screen pipes are as follows: by setting an automatic material turning mechanism and an automatic clamping mechanism, and cooperating with several sets of pipe racks, one-click automatic material turning and one-click automatic clamping functions can be realized during the production process, allowing pipes to be freely transported, lifted and processed, reducing the use of overhead cranes, significantly improving production efficiency, making processing faster and safer, realizing assembly line production, and improving product quality while increasing production capacity, reducing raw material waste, and saving production costs.

[0056] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A welding auxiliary device for oilfield sand control filter screen pipes, used in conjunction with a welding robot for welding oilfield sand control filter screen pipes, characterized in that, include: Auxiliary machine tool, which is equipped with slide rails; Loading and unloading racks are used to place pipe fittings, and the loading and unloading racks are arranged on both sides of the auxiliary machine tool; An automatic tipping mechanism is used to drive the lifting and flipping of pipe fittings. It includes a tipping base, a lifting plate, an inclined tipping plate, a bracket, and a blocking block. The tipping base is movably connected to the slide rail. The lifting plate is movably mounted on the tipping base. The inclined tipping plate is fixedly connected to the top of the lifting plate. The height of the inclined tipping plate gradually decreases from the feeding direction to the discharging direction, so as to drive the pipe fittings to flip in a specified direction. The bracket is fixedly connected to the side of the inclined tipping plate. The blocking block is movably connected to the bracket. The blocking block flips up and down on the bracket under the drive of a lever cylinder, so as to block the pipe fittings on the inclined tipping plate or release the pipe fittings. An automatic clamping mechanism for clamping pipe fittings includes a pipe fitting support assembly, a movable clamping assembly, and a misalignment linkage assembly. Two sets of the movable clamping assemblies are arranged opposite to each other on an auxiliary machine tool, and at least one set of the movable clamping assemblies is movably connected to the auxiliary machine tool via a slide rail to clamp both ends of the pipe fitting. Several sets of pipe fitting support assemblies are located between the two sets of movable clamping assemblies, and the pipe fitting support assemblies are slidably connected to the auxiliary machine tool via the slide rail to support and position the pipe fitting. The movable clamping assembly movably connected to the auxiliary machine tool is connected to the adjacent pipe fitting support assembly via the misalignment linkage assembly, so that the pipe fitting support assembly moves with the movable clamping assembly.

2. The welding auxiliary device for oilfield sand control and filter screen pipe according to claim 1, characterized in that, The automatic material turning mechanism also includes a material turning and lifting cylinder, which is mounted on the material turning base and drives the lifting plate to move up and down.

3. The welding auxiliary device for oilfield sand control and filter screen pipe according to claim 1, characterized in that, Both ends of the lifting plate extend toward the upper and lower material racks on both sides, so that the lifting plate and the upper and lower material racks partially overlap in the horizontal direction.

4. The welding auxiliary device for oilfield sand control and filter screen pipe according to claim 1, characterized in that, The top surface of the lifting plate is provided with multiple inclined tilting plates connected end to end.

5. The welding auxiliary device for oilfield sand control and filter screen pipe according to claim 1, characterized in that, The blocking block is rotatably mounted on the top of the bracket via a rotating shaft. A lever cylinder mounted on the bracket or lifting plate is movably connected to one end of the blocking block to drive the blocking block to rotate axially around the rotating shaft, causing the other end of the blocking block to swing upward above the inclined tilting plate to block the pipe.

6. The welding auxiliary device for oilfield sand control and filter screen pipe according to claim 1, characterized in that, The material-turning base is equipped with several quick-clamping clamps. A clamping block is fixedly connected to the bottom of the pressure bar in the quick-clamping clamp. The quick-clamping clamp drives the clamping block to move up and down to abut or move away from the top surface of the auxiliary machine tool, thereby realizing the locking and unlocking of the automatic material-turning mechanism.

7. The welding auxiliary device for oilfield sand control and filter screen pipe according to claim 1, characterized in that, The pipe support assembly includes a support base, a pipe support seat, a V-shaped roller, and a lifting mechanism. The V-shaped roller is rotatably disposed within the pipe support seat to support the pipe and position it within the V-shaped roller. The lifting mechanism drives the pipe support seat to move up and down to adjust the height of the V-shaped roller according to the processing requirements of pipes of different diameters.

8. The welding auxiliary device for oilfield sand control and filter screen pipe according to claim 1, characterized in that, The movable clamping assembly includes a movable platform, a conical top, and a telescopic drive mechanism. The movable platform is connected to the auxiliary machine tool, the conical top is movably connected to the movable platform, and the telescopic drive mechanism drives the conical top to perform telescopic movement, thereby clamping or loosening the pipe fitting.

9. A welding auxiliary device for oilfield sand control and filter screen pipe according to claim 8, characterized in that, In the two sets of movable clamping assemblies, one set of movable clamping assemblies has a rotary drive mechanism on the movable platform that drives the cone to rotate, and the other set of movable clamping assemblies has a push-pull drive mechanism connected to the movable platform. The push-pull drive mechanism drives the movable platform to move back and forth on the auxiliary machine tool.

10. A welding auxiliary device for oilfield sand control and filter screen pipe according to claim 1, characterized in that, The misaligned linkage assembly includes a first rod and a second rod. The outer end of one of the first rod and the second rod is fixedly connected to the moving platform, and the outer end of the other rod is fixedly connected to the support base. The inner ends of the first rod and the second rod are staggered, and a movable guide groove is provided on the first rod or the second rod. A limiting rod is fixedly connected to the second rod or the first rod. The limiting rod is movably connected to the movable guide groove to adjust the extension and retraction of the first rod and the second rod.

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