Special-shaped steel pipe welding device

Abstract

The invention relates to the technical field of special-shaped steel pipe machining, in particular to a special-shaped steel pipe welding device which comprises a welding module fixedly installed on a bottom plate, the welding module comprises a fixing frame and a power box which are fixedly installed on the bottom plate, and a second electric push rod is installed at the top of the fixing frame and fixedly connected with the top of an upper cover through a hanging rod. A rotatable upper tooth part is installed in the upper cover, a lower cover matched with the upper cover is installed on the power box, a rotatable lower tooth part with the same structure as the upper tooth part is installed on the lower cover, electromagnets used for locking the corresponding upper tooth part and the lower tooth part are installed on the upper cover and the lower cover correspondingly, and a linear moving pair is installed on the upper tooth part through a connecting block. An extension plate is installed on a sliding block of the linear moving pair, a welding machine is installed at the end, away from the sliding block, of the extension plate through an electric rotary table, and a driving motor for driving the upper tooth part and the lower tooth part is installed in the power box. The device is high in automation degree and can adapt to special-shaped steel pipes with various sections.

Description

Technical Field

[0001] The present invention relates to the technical field of special-shaped steel pipe processing, and particularly relates to a special-shaped steel pipe welding device. Background Art

[0002] With the development of industrial technology, special-shaped steel pipes are increasingly widely used in fields such as construction, machinery, and automobiles. Due to the complex cross-sectional shape of special-shaped steel pipes, it is difficult for traditional welding devices to achieve high-precision and high-efficiency welding. In the prior art, the welding of special-shaped steel pipes usually adopts manual operation or semi-automatic equipment, and there are the following problems: poor adaptability. Traditional welding devices are difficult to adapt to special-shaped steel pipes with different cross-sectional shapes. Especially for the welding of asymmetric or curved seams, it is often necessary to frequently adjust the positions of the fixture and the welding torch, resulting in low production efficiency; low degree of automation. The lifting, clamping, and welding actions of existing equipment are mostly step-by-step operations, lacking coordinated control, and it is difficult to achieve a continuous and precise welding process.

[0003] To solve the above problems, some technical solutions attempt to improve the welding effect by improving the fixture or the driving method of the welding torch, but there are still defects such as complex structure and cumbersome adjustment. Summary of the Invention

[0004] In order to solve the defects in the prior art, the present invention provides a special-shaped steel pipe welding device, which is specifically realized through the following technical solutions: A special-shaped steel pipe welding device includes a welding module fixedly installed on a bottom plate and two automatically liftable tables, and the two tables are respectively located on both sides of the welding module; a clamping component is fixedly installed at one end of the table close to the welding module. The welding module includes a fixed frame and a power box fixedly installed on the bottom plate. A second electric push rod is installed on the top of the fixed frame, and the output end of the second electric push rod is vertically downward and fixedly connected to the top of an upper cover through a suspension rod. A rotatable upper tooth part is installed in the upper cover. A lower cover matching the upper cover is installed on the power box, and a lower tooth part that can rotate and has the same structure as the upper tooth part is installed on the lower cover. Electromagnets for locking the corresponding upper tooth part and lower tooth part are installed on both the upper cover and the lower cover. The upper tooth part is installed with a linear motion pair through a connecting block, and an extension plate is installed on the slider of the linear motion pair. A welding machine is installed at one end of the extension plate far from the slider through an electric turntable. A driving motor for driving the upper tooth part and the lower tooth part is installed in the power box.

[0005] Guide grooves are installed in both the upper cover and the lower cover, and cages with rollers are installed on both sides of the upper tooth part and the lower tooth part. The cages are located in the corresponding guide grooves and are in rolling cooperation with the guide grooves.

[0006] A first gear is fixedly installed at the output end of the driving motor. The first gear meshes with a second gear. The second gear is fixedly installed on a gear shaft. Both ends of the gear shaft are installed in a power box through bearing seats. The second gear drives an upper tooth part and a lower tooth part.

[0007] A through hole for the second gear to pass through is provided on the lower cover.

[0008] Four vertical telescopic cylinders are fixedly installed at the bottom of the tabletop. The bottom of the telescopic cylinder extends into a corresponding guide cylinder. The bottom of the guide cylinder is fixedly connected to a bottom plate. A first electric push rod is also fixedly installed on the bottom plate. The output end of the first electric push rod faces upward and is fixedly connected to the bottom of the corresponding tabletop through a flange.

[0009] A guide rod is installed on the upper cover. The guide rod penetrates through a fixing frame.

[0010] Limit holes corresponding to the electromagnets are provided on both the upper tooth part and the lower tooth part.

[0011] The linear motion pair is a linear motor. The slider of the linear motor is fixedly connected to one end of an extension plate through a bolt.

[0012] The clamping component includes a slide rail fixedly installed on the tabletop. A first clamping block and a second clamping block are slidably installed on the slide rail. The first clamping block and the second clamping block are arranged in a mirror image. A lead screw that can rotate freely is installed on the slide rail. The lead screw is provided with a first thread section and a second thread section. The thread directions of the first thread section and the second thread section are opposite. The first clamping block and the second clamping block are respectively in threaded engagement with the first thread section and the second thread section.

[0013] A driving component is installed at one end of the lead screw.

[0014] The technical solution of the present invention has the following advantages: High adaptability and flexibility: Through the liftable tabletop, adjustable clamping component, and multi-degree-of-freedom motion design of the welding machine (including linear motion pair, electric turntable, and slewing mechanism), it can meet the welding requirements of special-shaped steel pipes with different cross-sectional shapes, especially suitable for precise welding of asymmetric or curved seams.

[0015] Automation and coordinated control: Using automated components such as electric push rods, driving motors, and electromagnets, and cooperating with a controller to realize synchronous adjustment of the tabletop lift, ring gear rotation, position and angle of the welding torch, improving the welding efficiency, reducing manual intervention, and avoiding precision deviation caused by traditional step-by-step operations.

[0016] Structural Stability and Precision Assurance: The upper tooth part and the lower tooth part are in rolling fit with the guide groove through a cage with rollers, ensuring smooth rotation and precise positioning of the gear ring; the electromagnet locking mechanism prevents the gear ring from falling off, enhancing the reliability of equipment operation; the design of the guide rod and the telescopic cylinder further strengthens the structural stability between the welding module and the tabletop.

[0017] Modularity and Convenient Maintenance: The split upper cover, lower cover and gear ring structure are convenient for disassembly, assembly and maintenance; the clamping component uses a lead screw to drive mirror clamping blocks, which can quickly adapt to different pipe diameters and is easy to replace the fixture.

[0018] Cost - effectiveness: By optimizing mechanical transmission and applying standardized components, the manufacturing cost is reduced while ensuring performance.

[0019] In summary, the present invention solves the problems of poor adaptability, low automation level and insufficient precision in the prior art, and realizes efficient, precise and stable operation of special - shaped steel pipe welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following - described drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 is the structural schematic diagram of the present invention; Figure 2 is the structural schematic diagram of the welding module; Figure 3 is the structural schematic diagram of the slewing mechanism; Figure 4 is the internal structural schematic diagram of the slewing mechanism; Figure 5 is the structural schematic diagram of the upper cover; Figure 6 is the structural schematic diagram of the lower cover; Figure 7 is the structural schematic diagram of the gear ring; Figure 8 is for Figure 7 the structural schematic diagram at position A in Figure 9 is for Figure 7 the structural schematic diagram at position B in Figure 10 is the structural schematic diagram of the power box; Figure 11 is the structural schematic diagram of the clamping component.

[0022] In the figure, 1 - bottom plate, 2 - guide cylinder, 3 - telescopic cylinder, 4 - first electric push rod, 5 - clamping component, 6 - fixing bracket, 7 - guide rod, 8 - second electric push rod, 9 - slewing mechanism, 10 - power box, 11 - welding machine, 12 - support rod, 13 - upper cover, 14 - connecting block, 15 - electromagnet, 16 - lower cover, 17 - lower tooth part, 18 - upper tooth part, 19 - linear motor, 20 - welding torch, 21 - first guide groove, 22 - first accommodation cavity, 23 - second accommodation cavity, 24 - second guide groove, 25 - through hole, 26 - extension plate, 27 - connecting frame, 28 - roller, 29 - first cage, 30 - roller, 31 - locking bolt, 32 - second cage, 33 - driving motor, 34 - motor seat, 35 - first gear, 36 - second gear, 37 - slide rail, 38 - lead screw, 39 - first clamping block, 40 - second clamping block. Detailed implementation manner

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred modules or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral molding; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] As shown in the atta Figure 1As shown in the figure, the present invention provides a special-shaped steel pipe welding device, which includes a bottom plate 1. A welding module is installed in the middle of the bottom plate 1, and a welding machine 11 capable of rotating 360 degrees around a certain horizontal axis is installed on the welding module. Lifting tables are installed at both ends of the bottom plate 1, and the two tables are respectively located on both sides of the welding module.

[0028] Both tables are located on the axis of the welding module.

[0029] Four vertical telescopic cylinders 3 are fixedly installed at the bottom of the aforementioned table. In this embodiment, the four telescopic cylinders 3 are respectively installed at the four corners of the bottom of the table.

[0030] The bottom of the telescopic cylinder 3 extends into the corresponding guide cylinder 2, and the bottom of the guide cylinder 2 is fixedly connected to the bottom plate 1.

[0031] Two vertical first electric push rods 4 are also fixedly installed on the bottom plate 1. The output ends of the first electric push rods 4 face upward and are fixedly connected to the bottom of the corresponding table through flanges.

[0032] A clamping component 5 is fixedly installed at one end of the table close to the welding module. The clamping component 5 is used to fix both sides of the seam of the special-shaped steel pipe to be welded and make the axis of the seam coincide with the predetermined axis.

[0033] The structure of the welding module is as shown in the attached Figure 1 and attached Figure 2 As shown, it includes a fixing frame 6 fixedly installed on the bottom plate 1. The bottom of its vertical part is fixedly connected to the bottom plate 1, and the top of the horizontal part is fixedly installed with a second electric push rod 8.

[0034] The second electric push rod 8 is vertically arranged, and the output end is vertically downward.

[0035] The output end of the second electric push rod 8 penetrates through the horizontal part and is fixedly connected to the top of the hanging rod through a flange. The bottom of the hanging rod is fixedly connected to the top of the slewing mechanism 9 through a flange.

[0036] In this embodiment, the slewing mechanism 9 is in a circular ring shape, and the aforementioned predetermined axis is the axis of the slewing mechanism 9.

[0037] A rotatable gear ring is installed in the slewing mechanism 9, and the welding machine 11 capable of rotating around the axis of the slewing mechanism 9 is installed on the gear ring.

[0038] Two guide rods 7 are also fixedly installed on the top of the slewing mechanism 9. The guide rods 7 are also vertically arranged, and their axes are parallel to the axis of the second electric push rod 8.

[0039] A power box 10 is also fixedly installed on the bottom plate 1. The power box 10 is used to provide power for the gear ring, drive it to drive the welding machine 11 to rotate, and complete the welding of the special-shaped steel pipe.

[0040] The structure of the slewing mechanism 9 is as shown in the appendix Figure 3 and the appendix Figure 4 As shown, it is integrally formed by splicing two semi-circular structures, the aforementioned suspension rod and guide rod 7 are both installed on the upper semi-circular structure, and the lower semi-circular structure is fixed to the top of the power box 10 through the support rod 12.

[0041] Specifically, the slewing mechanism 9 includes a cover body, a gear ring is installed inside the cover body and can rotate freely; a connecting block 14 is fixedly installed on the inner wall of the gear ring through bolts, and the welding machine 11 is fixedly installed at one end of the connecting block 14 through bolts.

[0042] The cover body is used to limit the gear ring and can protect the convex teeth of the gear ring to prevent injury.

[0043] The cover body is composed of an upper cover 13 and a lower cover 16. The aforementioned guide rod 7 and suspension rod are both fixed on the upper cover 13.

[0044] The gear ring is also composed of an upper tooth part 18 and a lower tooth part 17 that are both semi-circular. The connection between the two can adopt the plug-in structure in the prior art, or the two end faces can directly abut; the connection method between the upper cover 13 and the lower cover 16 is the same.

[0045] The aforementioned connecting block 14 is installed on the inner wall of the upper tooth part 18.

[0046] In the initial state, the upper tooth part 18 is located inside the upper cover 13, and the lower tooth part 17 is located inside the lower cover 16. After the welding starts, the power box 10 drives the entire gear ring to rotate 360 degrees, that is, both the upper tooth part 18 and the lower tooth part 17 rotate 360 degrees and then return to the initial position.

[0047] The structure of the upper cover 13 is as shown in the appendix Figure 5 As shown, it includes an arc-shaped first accommodating cavity 22, and the cross-section of the first accommodating cavity 22 is U-shaped; first guide grooves 21 are opened on both side walls of the first accommodating cavity 22.

[0048] The first accommodating cavity 22 is used to accommodate the upper tooth part 18.

[0049] The first guide grooves 21 are used to accommodate the rollers installed on both sides of the upper tooth part 18. Specifically, as shown in the appendix Figure 7 and the appendix Figure 9 As shown, a first cage 29 and a second cage 32 are respectively installed on both sides of the upper tooth part 18. The first cage 29 and the second cage 32 are respectively fixed on both sides of the upper tooth part 18 through two locking bolts 31 that penetrate the upper tooth part 18. In this embodiment, the locking bolts 31 sequentially penetrate the first cage 29, the upper tooth part 18, and the second cage 32, and then nuts are installed for locking. Counterbores are opened on both the first cage 29 and the second cage 32, and the two counterbores are respectively used to accommodate the bolt head and the nut.

[0050] At least three rollers 30 are installed on the first cage 29, and at least three rollers 30 are also installed on the second cage 32. The first cage 29 and the second cage 32 are respectively located in two first guide grooves 21 of the upper cover 13, and the rollers 30 are in rolling fit with the corresponding first guide grooves 21.

[0051] The locking bolt 31 is an internal hexagonal bolt. Both ends of the locking bolt 31 are respectively located in the counterbores of the first cage 29 and the second cage 32 to avoid adverse effects on the rotation of the upper tooth part 18.

[0052] As shown in the Figure 3 drawing, three electromagnets 15 are installed on both side walls of the upper cover 13 by bolts. When the electromagnets 15 are energized, the central shaft penetrates through the upper cover 13 and is inserted into the limiting hole of the upper tooth part 18. When the electromagnets 15 are de-energized, the central shaft disengages from the limiting hole.

[0053] The electromagnets 15 are used to fix the upper tooth part 18 to prevent the upper tooth part 18 from falling off the upper cover 13 when the second electric push rod 8 lifts the upper cover 13.

[0054] The structure of the lower cover 16 is as shown in the Figure 6 drawing, including an arc-shaped second accommodation cavity 23, and the cross-section of the second accommodation cavity 23 is U-shaped; second guide grooves 24 are opened on both side walls of the second accommodation cavity 23.

[0055] The second accommodation cavity 23 is used to accommodate the lower tooth part 17. As shown in the Figure 7 drawing, the structure of the lower tooth part 17 is exactly the same as that of the upper tooth part 18, that is, the first cage 29 and the second cage 32 are respectively installed on both sides of the lower tooth part 17, and these first cages 29 and second cages 32 are respectively located in the corresponding second guide grooves 24.

[0056] A through hole 25 communicating with the second accommodation cavity 23 is opened at the bottom of the lower cover 16, and the through hole 25 is used for the driving connection between the gear ring and the power box 10.

[0057] In order to ensure the stability of the lower tooth part 17 when the second electric push rod 8 lifts the upper cover 13, the lower cover 16 is also installed with electromagnets 15, and the installation method is the same as that of the electromagnets 15 on the upper cover 13. The electromagnets 15 are prior art and will not be elaborated here.

[0058] In the initial state, the upper cover 13 and the lower cover 16 are snapped together to form a complete cover body. The first accommodating cavity 22 and the second accommodating cavity 23 form a complete installation cavity, and the first guiding groove 21 and the corresponding second guiding groove 24 form a complete guiding groove. The lower tooth part 17 and the upper tooth part 18 form a complete tooth ring. The tooth ring is located in the installation cavity, and the first cage 29 and the second cage 32 on the tooth ring are located in the corresponding guiding grooves, so that the tooth ring can rotate freely and maintain the stability of its position.

[0059] The structure of the aforementioned power box 10 is as shown in the appendix Figure 10 and includes a box body. Inside the box body, a driving motor 33 is installed through a motor base 34. A first gear 35 is fixedly installed at the output end of the driving motor 33. The first gear 35 meshes with a second gear 36. The second gear 36 is fixedly installed on a gear shaft, and both ends of the gear shaft are installed in the box body through bearing seats.

[0060] The second gear 36 passes through the through hole 25 at the top of the box body and meshes with the tooth ring.

[0061] The structure of the aforementioned welding machine 11 is as shown in the appendix Figure 8 and includes a linear motor 19 fixedly installed at one end of a connecting block 14 through bolts. The slider of the linear motor 19 is fixedly connected to the first end of an extension plate 26 through bolts. The second end of the extension plate 26 is installed with an electric turntable through bolts, and a welding torch 20 is installed on the electric turntable through bolts. A wire feeder is installed on the welding torch 20.

[0062] At the top of the linear motor 19, that is, at the end far from the welding torch 20, a roller shaft 28 is installed through a connecting frame 27. The roller shaft 28 is used for installing welding wire.

[0063] Of course, the linear motor 19 can also be replaced with a linear guide pair composed of a lead screw, a nut slider, a guide rail, and a servo motor, or replaced with a third electric push rod. When the linear motor 19 is replaced with a linear guide pair, the extension plate 26 is connected to the nut slider through bolts, and the connecting frame 27 can be installed at the top of the guide rail. When the linear motor 19 is replaced with a third electric push rod, the extension plate 26 is fixedly connected to the output end of the third electric push rod, or the electric turntable is directly installed at the output end of the third electric push rod, and the connecting frame 27 can be installed on the cylinder body of the third electric push rod.

[0064] The linear motor 19 and the electric turntable are both prior arts and will not be elaborated here.

[0065] The structure of the aforementioned clamping component 5 is as shown in the appendix Figure 11 and includes a slide rail 37 fixedly installed on the tabletop through bolts. The top surface of the slide rail 37 is flush with the top surface of the tabletop. A first clamping block 39 and a second clamping block 40 are slidably installed on the slide rail 37, and the first clamping block 39 and the second clamping block 40 are arranged in a mirror image.

[0066] A lead screw 38 that can rotate freely is installed on the slide rail 37. The lead screw 38 is provided with a first thread section and a second thread section, and the thread directions of the first thread section and the second thread section are opposite. The aforementioned first clamping block 39 and second clamping block 40 are respectively in threaded engagement with the first thread section and the second thread section. Therefore, when the lead screw 38 rotates, the first clamping block 39 and the second clamping block 40 move in a mirror image manner.

[0067] One end of the lead screw 38 can be installed with components such as a handwheel, a servo motor, etc. for driving the rotation of the lead screw 38. Preferably, a servo motor is used.

[0068] Both the first clamping block 39 and the second clamping block 40 are provided with reserved holes for installing clamps that match different products.

[0069] In this embodiment, the servo motor, the electric push rod, the electric turntable, the welding machine 11, the linear motor 19, the drive motor 33, and the electromagnet 15 are all electrically connected to the controller and are uniformly controlled by the controller.

[0070] In this embodiment, the electrical appliances on the slewing mechanism are powered by slip rings. For example, a complete slip ring is divided into two semi - circles, which are respectively installed on the upper cover 13 and the lower cover 16. When the upper cover 13 and the lower cover 16 are buckled together, they form a complete slip ring, and the electrical appliances are connected to the slip ring through corresponding wires.

[0071] During use, first, the electromagnet 15 is powered on, and then the upper cover 13 is lifted by the second electric push rod 8. Subsequently, the special - shaped steel pipe that has been bent into a predetermined shape by a pipe bender is placed on the tabletop, and the joint of the special - shaped steel is adjusted in place. Then, the special - shaped steel pipe is clamped and fixed by the two clamping components 5. The controller automatically controls the synchronous lifting of the two tabletops, adjusts the height of the special - shaped steel pipe, and places the upper cover 13 in place.

[0072] Immediately, the motor base 34, the welding machine 11, the electric turntable, and the linear moving pair are started, and welding begins according to a pre - set trajectory. Since the welding machine 11 is installed on the linear moving pair through the electric turntable, the distance and angle between the welding machine 11 and the axis of the slewing mechanism can be adjusted. Therefore, it can be applied to the welding of various special - shaped steel pipes.

[0073] After the gear ring rotates 360 degrees, the welding is completed. Immediately, the electromagnet 15 is powered on, the second electric push rod 8 lifts the upper cover 13, the clamping components 5 are loosened, and the welded special - shaped steel pipe is taken off. At this time, the position of the tabletop does not need to be changed until the product type is changed.

[0074] Obviously, the above embodiments are merely examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A special-shaped steel pipe welding device, characterized in that, It includes a welding module fixedly installed on the base plate (1) and two automatically liftable tables, with the two tables located on both sides of the welding module respectively; a clamping component (5) is fixedly installed at one end of each table close to the welding module. The welding module includes a fixed frame (6) and a power box (10) fixedly installed on the base plate (1). A second electric push rod (8) is installed at the top of the fixed frame (6), and the output end of the second electric push rod (8) is vertically downward and fixedly connected to the top of the upper cover (13) through a suspension rod. A rotatable upper tooth part (18) is installed inside the upper cover (13). A lower cover (16) matching the upper cover (13) is installed on the power box (10), and a lower tooth part (17) that can rotate and has the same structure as the upper tooth part (18) is installed on the lower cover (16). Electromagnets (15) for locking the corresponding upper tooth part (18) and lower tooth part (17) are installed on both the upper cover (13) and the lower cover (16). The upper tooth part (18) is installed with a linear motion pair through a connecting block (14), and an extension plate (26) is installed on the slider of the linear motion pair. A welding machine (11) is installed at one end of the extension plate (26) away from the slider through an electric rotary table. A driving motor (33) for driving the upper tooth part (18) and the lower tooth part (17) is installed inside the power box (10).

2. The special-shaped steel pipe welding device according to claim 1, characterized in that, Guide grooves are installed inside both the upper cover (13) and the lower cover (16). Cage holders with rollers (30) are installed on both sides of the upper tooth part (18) and the lower tooth part (17). The cage holders are located in the corresponding guide grooves and are in rolling cooperation with the guide grooves.

3. The special-shaped steel pipe welding device according to claim 1, characterized in that, A first gear (35) is fixedly installed at the output end of the driving motor (33). The first gear (35) meshes with a second gear (36). The second gear (36) is fixedly installed on a gear shaft, and both ends of the gear shaft are installed in the power box (10) through bearing seats. The second gear (36) drives the upper tooth part (18) and the lower tooth part (17).

4. The special-shaped steel pipe welding device according to claim 3, characterized in that, A through hole (25) for the second gear (36) to pass through is provided on the lower cover (16).

5. The special-shaped steel pipe welding device according to claim 1, characterized in that, Four vertical telescopic cylinders (3) are fixedly installed at the bottom of each table. The bottom of the telescopic cylinder (3) extends into the corresponding guide cylinder (2), and the bottom of the guide cylinder (2) is fixedly connected to the base plate (1). A first electric push rod (4) is also fixedly installed on the base plate (1), and the output end of the first electric push rod (4) faces upward and is fixedly connected to the bottom of the corresponding table through a flange.

6. The special-shaped steel pipe welding device according to claim 1, wherein A guide rod (7) is installed on the upper cover (13), and the guide rod (7) penetrates through the fixed frame (6).

7. The special-shaped steel pipe welding device according to claim 1, characterized in that, Limit holes corresponding to the electromagnets (15) are provided on both the upper tooth part (18) and the lower tooth part (17).

8. The special-shaped steel pipe welding device according to claim 1, characterized in that, The linear motion pair is a linear motor (19), and the slider of the linear motor (19) is fixedly connected to one end of the extension plate (26) through bolts.

9. The special-shaped steel pipe welding device according to claim 1, characterized in that The clamping member (5) includes a slide rail (37) fixedly installed on the tabletop. A first clamping block (39) and a second clamping block (40) are slidably installed on the slide rail (37). The first clamping block (39) and the second clamping block (40) are arranged in a mirror image. The slide rail (37) is installed with a lead screw (38) that can rotate freely. The lead screw (38) is provided with a first thread section and a second thread section. The thread directions of the first thread section and the second thread section are opposite. The first clamping block (39) and the second clamping block (40) are respectively in threaded engagement with the first thread section and the second thread section.

10. The special-shaped steel pipe welding device according to claim 9, characterized in that, One end of the lead screw (38) is installed with a driving member.

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