A clamping device for welding special-shaped pipes

Abstract

The present invention discloses a clamping device for welding special-shaped pipes, comprising a driving component, wherein a plurality of mounting frames are arranged at the upper end of the driving component, and a rotating component is arranged in the middle of the mounting frame. In the present invention, the driving component, the mounting frame, the rotating component, the upper clamping component, the lower clamping component, and the elastic component cooperate with each other, so that special-shaped pipes with different cross sections can be clamped and fixed, such as a D-shaped pipe, whose cross section is similar to the letter "D", an elliptical pipe, whose cross section is elliptical, a triangular pipe, whose cross section is triangular, and a trapezoidal pipe, whose cross section is similar to a trapezoid. Special-shaped pipes are used in many fields, but when they are welded and fixed, a customized clamping device is usually required and is not universal. Through the scheme, a soft chain can be used to fit the surface of the special-shaped pipe, so as to achieve the purpose of fixing it. At the same time, the active sprocket is used to drive the chain to rotate, and the special-shaped pipe can also be driven to rotate during welding, thereby further improving practicality.

Description

Technical Field

[0001] The invention relates to the technical field of special-shaped pipe welding and fixing, and more specifically to a clamping device for special-shaped pipe welding. Background Art

[0002] Special-shaped tubes refer to tubes with various irregular cross-sectional shapes in addition to common shapes such as round and square. Special-shaped tubes have various shapes, and the following are common types: D-shaped tube: its cross-sectional shape is similar to the letter "D", elliptical tube: the cross-sectional shape is elliptical, triangular tube, the cross-sectional shape is triangular, and trapezoidal tube, the cross-sectional shape is similar to a trapezoid. Special-shaped tubes are used in many fields. For example, in the field of architecture, they are used to build unique architectural structures and decorative elements to increase the beauty and uniqueness of the building, furniture manufacturing to create creative and personalized furniture designs, and machinery manufacturing to meet the structural and functional requirements of some special mechanical parts. Through welding, multiple special-shaped tubes can be connected together to form a more stable overall structure. For example, when building a large frame structure in a building, welding special-shaped tubes can ensure that the frame can withstand large loads and external forces, and increase the safety and reliability of the structure. Sometimes, the length or shape of a single special-shaped tube cannot fully meet the needs of actual applications. Through welding, special-shaped tubes of different lengths or shapes can be spliced ​​into the required size and shape. For example, when manufacturing furniture of special shapes, several sections of special-shaped tubes may need to be welded together to achieve the ideal design effect.

[0003] Chinese patent application number: CN106475721B, provides a clamping device for welding special-shaped pipes. The solution has a simple structure and can make the welding and clamping tooling of the automobile muffler easy to operate, improve the welding assembly efficiency, and fix the various components of the automobile muffler, especially the special-shaped pipe, during the welding process, reduce welding errors, and improve the welding quality of the product. However, when clamping a triangular, trapezoidal, or elliptical pipe, it cannot achieve the clamping and fixing effect. When facing welding pipes with different cross sections, different clamping devices need to be replaced to achieve the fixing effect.

[0004] Therefore, in view of the above technical problems, it is necessary to provide a clamping device for welding special-shaped pipes. Summary of the invention

[0005] The object of the present invention is to provide a clamping device for welding special-shaped pipes to solve the above-mentioned problems.

[0006] In order to achieve the above purpose, the technical solution provided by an embodiment of the present invention is as follows:

[0007] A clamping device for welding a special-shaped pipe comprises a driving assembly, a plurality of mounting frames are arranged at the upper end of the driving assembly, a rotating assembly is arranged in the middle of the mounting frame, an upper clamping assembly is arranged at the upper end of the rotating assembly, a lower clamping assembly is arranged at the lower end of the rotating assembly, and an elastic assembly is arranged between the upper clamping assembly and the lower clamping assembly;

[0008] The driving assembly includes a base, a pair of first servo motors are fixedly connected inside the base, a pair of mutually symmetrical bidirectional screw rods are rotatably connected inside the base, one end of the pair of bidirectional screw rods is respectively fixedly connected to the output ends of the pair of first servo motors, and a pair of sliding blocks are connected to the middle of the bidirectional screw rods through threads;

[0009] The present invention arranges a driving component and utilizes a first servo motor inside a base to drive a bidirectional screw rod to rotate, so that a sliding block moves, thereby clamping the special-shaped pipe.

[0010] As a further improvement of the present invention, the rotating assembly includes an arc-shaped sleeve fixedly connected to the inside of the mounting frame, a semicircular shell is fixedly connected to the middle of the arc-shaped sleeve, a chain is sleeved inside the arc-shaped sleeve, a rotating shaft is rotatably connected to the inside of the semicircular shell, a driving sprocket is fixedly connected to the middle of the rotating shaft, and the driving sprocket is meshed with the chain, a second servo motor is fixedly connected to the outside of the semicircular shell, and the output end of the second servo motor is fixedly connected to one end of the rotating shaft, and a pair of circular protrusions are fixedly connected to both upper and lower ends of the arc-shaped sleeve;

[0011] The present invention arranges a rotating assembly and utilizes a second servo motor to drive a driving sprocket on a rotating shaft to rotate, thereby driving the chain to move, thereby achieving the effect of driving the special-shaped pipe to rotate during welding and facilitating the welding operation.

[0012] As a further improvement of the present invention, the upper clamping assembly includes an upper strip sleeve, the lower end of the upper strip sleeve is fixedly connected to a pair of first rotating rings, and the pair of the first rotating rings are respectively rotatably connected to a pair of circular protrusions at the upper end of the semicircular shell, the lower end of the upper strip sleeve is fixedly connected to two pairs of limit blocks, a sliding rod is fixedly connected between a pair of the limit blocks, and a one-way screw rod is rotatably connected between the other pair of the limit blocks, a rectangular adjusting rod is provided between the sliding rod and the one-way screw rod, the front and rear sides of the rectangular adjusting rod are fixedly connected to sliding protrusions, the sliding protrusion at the front end is slidably connected to the sliding rod, and the sliding protrusion at the rear end is threadedly connected to the one-way screw rod, one end of the rectangular adjusting rod is rotatably connected to the first driven sprocket, and the first driven sprocket is meshed with the chain.

[0013] As a further improvement of the present invention, the lower clamping assembly includes a lower strip sleeve, one end of the lower strip sleeve is fixedly connected to a pair of mutually symmetrical second rotating rings, the pair of second rotating rings are respectively rotatably connected to a pair of circular protrusions at the lower end of the arc sleeve, the other end of the lower strip sleeve is fixedly connected to a rectangular fixing rod, one end of the rectangular fixing rod is rotatably connected to a second driven sprocket, and the second driven sprocket is meshingly connected to the chain.

[0014] As a further improvement of the present invention, the elastic component includes a pair of mounting rings, which are fixedly connected to the middle parts of the upper strip sleeve and the lower strip sleeve respectively, and the interiors of the pair of mounting rings are fixedly connected with spring rods by screws.

[0015] As a further improvement of the present invention, threaded holes are provided at both upper and lower ends of the mounting frame, the lower end of the mounting frame is fixedly connected to the upper end of the sliding block by bolts, and a strip hole is provided in the middle of the mounting frame.

[0016] As a further improvement of the present invention, the outer ring of the arc-shaped sleeve is provided with a pair of vertically symmetrical rectangular holes, and the inner ring of the arc-shaped sleeve is provided with an arc-shaped hole;

[0017] The invention provides a pair of vertically symmetrical rectangular holes on the outer ring of the arc-shaped sleeve to facilitate the chain to pass through when the shape is changed.

[0018] As a further improvement of the present invention, a strip-shaped sliding hole is provided at the lower end of the upper strip-shaped sleeve;

[0019] The invention provides a strip-shaped sliding hole at the lower end of the upper strip-shaped sleeve to slide and limit the rectangular adjusting rod.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] (1) The present invention can clamp and fix a variety of special-shaped tubes with different cross-sections through the mutual cooperation between the driving component, the mounting frame, the rotating component, the upper clamping component, the lower clamping component, and the elastic component. For example, a D-shaped tube has a cross-sectional shape similar to the letter "D", an elliptical tube has an elliptical cross-section, a triangular tube has a triangular cross-section, and a trapezoidal tube has a cross-section similar to a trapezoid. Special-shaped tubes are used in many fields, but when they are welded and fixed, a customized clamping device is usually required and is not universal. Through this solution, a soft chain can be used to fit the surface of the special-shaped tube, thereby achieving the purpose of fixing it. At the same time, the active sprocket drives the chain to rotate, and the special-shaped tube can also be driven to rotate during welding, thereby further improving practicality.

[0022] (2) The present invention realizes the following by superimposing and linking two sets of mounting frames, rotating components, upper clamping components, lower clamping components, and elastic components, and replacing the extended chain can achieve Figure 4The form shown can be used to clamp and fix special-shaped pipes with larger diameters, further improving the adaptability of the solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the overall split structure in the present invention;

[0025] Figure 3 It is a schematic diagram of adjusting the overall structure in the present invention;

[0026] Figure 4 It is a schematic diagram of the overall structure of the lengthened chain in the present invention;

[0027] Figure 5 It is a schematic diagram of the structure of the mounting frame in the present invention;

[0028] Figure 6 It is a schematic diagram of the cross-sectional structure of the arc-shaped sleeve in the present invention;

[0029] Figure 7 This is a schematic diagram of the overall disassembly structure of the elastic component in the present invention;

[0030] Figure 8 It is a schematic diagram of the overall structure of the clamping assembly in the present invention;

[0031] Fig. 9 It is a schematic diagram of the overall structure of the upper clamping assembly in the present invention;

[0032] Fig.10 It is a schematic diagram of the overall disassembly structure of the rotating assembly in the present invention.

[0033] Numbers in the figure: 1, driving assembly; 2, mounting frame; 3, rotating assembly; 4, upper clamping assembly; 5, lower clamping assembly; 6, elastic assembly; 101, base; 102, first servo motor; 103, bidirectional screw rod; 104, sliding block; 301, arc sleeve; 302, semicircular housing; 303, chain; 304, rotating shaft; 305, driving sprocket; 306, second servo motor; 307, circular Bump; 401, upper strip sleeve; 402, first rotating ring; 403, limit block; 404, sliding rod; 405, one-way screw; 406, rectangular adjusting rod; 407, sliding bump; 408, first driven sprocket; 501, lower strip sleeve; 502, second rotating ring; 503, rectangular fixing rod; 504, second driven sprocket; 601, mounting ring; 602, spring rod; 603, screw. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0035] See also Figure 1 - Fig.10 As shown, a clamping device for welding a special-shaped pipe comprises a driving assembly 1, a plurality of mounting frames 2 are arranged at the upper end of the driving assembly 1, a rotating assembly 3 is arranged in the middle of the mounting frame 2, an upper clamping assembly 4 is arranged at the upper end of the rotating assembly 3, a lower clamping assembly 5 is arranged at the lower end of the rotating assembly 3, and an elastic assembly 6 is arranged between the upper clamping assembly 4 and the lower clamping assembly 5;

[0036] The driving assembly 1 includes a base 101, a pair of first servo motors 102 are fixedly connected inside the base 101, a pair of mutually symmetrical bidirectional screw rods 103 are rotatably connected inside the base 101, one end of the pair of bidirectional screw rods 103 is respectively fixedly connected to the output ends of the pair of first servo motors 102, and a pair of sliding blocks 104 are connected to the middle of the bidirectional screw rods 103 through threads;

[0037] The present invention provides a driving assembly 1 and utilizes a first servo motor 102 inside a base 101 to drive a bidirectional screw rod 103 to rotate, thereby moving a sliding block 104 and clamping the special-shaped tube.

[0038] See also Figure 1 - Fig.10 As shown, the rotating assembly 3 includes an arc sleeve 301 fixedly connected to the inside of the mounting frame 2, a semicircular shell 302 is fixedly connected to the middle of the arc sleeve 301, a chain 303 is sleeved inside the arc sleeve 301, a rotating shaft 304 is rotatably connected to the inside of the semicircular shell 302, a driving sprocket 305 is fixedly connected to the middle of the rotating shaft 304, and the driving sprocket 305 is meshed with the chain 303, a second servo motor 306 is fixedly connected to the outside of the semicircular shell 302, and the output end of the second servo motor 306 is fixedly connected to one end of the rotating shaft 304, and a pair of circular protrusions 307 are fixedly connected to the upper and lower ends of the arc sleeve 301;

[0039] The present invention starts a pair of first servo motors 102 inside the base 101. The output end of the first servo motor 102 starts to rotate, driving the bidirectional screw 103 connected thereto to rotate. Since the bidirectional screw 103 is threadedly connected to the sliding block 104, the rotation of the bidirectional screw 103 enables the pair of sliding blocks 104 to move closer to or farther from each other along the axis direction of the screw. Threaded holes are provided at both the upper and lower ends of the mounting frame 2, which are fixedly connected to the upper end of the sliding block 104 by bolts. When the sliding block 104 moves, the mounting frame 2 fixedly connected thereto also moves, and a rotating component 3 is provided in the middle of the mounting frame 2.

[0040] See also Figure 1 - Fig. 9 As shown, the upper clamping assembly 4 includes an upper strip sleeve 401, a pair of first rotating rings 402 are fixedly connected at the lower end of the upper strip sleeve 401, and the pair of first rotating rings 402 are respectively rotatably connected to a pair of circular protrusions 307 at the upper end of the semicircular shell 302, and two pairs of limit blocks 403 are fixedly connected at the lower end of the upper strip sleeve 401, a sliding rod 404 is fixedly connected between a pair of limit blocks 403, and a one-way screw rod 405 is rotatably connected between the other pair of limit blocks 403, and a rectangular adjustment rod 406 is provided between the sliding rod 404 and the one-way screw rod 405, and the front and rear sides of the rectangular adjustment rod 406 are fixedly connected with sliding protrusions 407, the front end sliding protrusion 407 is slidably connected to the sliding rod 404, and the rear end sliding protrusion 407 is threadedly connected to the one-way screw rod 405, and one end of the rectangular adjustment rod 406 is rotatably connected to a first driven sprocket 408, and the first driven sprocket 408 is meshed and connected with the chain 303;

[0041] The present invention includes an upper strip sleeve 401, a first rotating ring 402, a stopper 403, a sliding rod 404, a one-way screw 405, a rectangular adjustment rod 406, a sliding protrusion 407 and a first driven sprocket 408 through an upper clamping assembly 4. A pair of first rotating rings 402 at the lower end of the upper strip sleeve 401 are rotatably connected with a pair of circular protrusions 307 at the upper end of the semicircular housing 302, so that the upper strip sleeve 401 can rotate relatively.

[0042] See also Figure 1 - Figure 8 As shown, the lower clamping assembly 5 includes a lower strip sleeve 501, one end of which is fixedly connected to a pair of second symmetrical rotating rings 502, the pair of second rotating rings 502 are respectively rotatably connected to a pair of circular protrusions 307 at the lower end of the arc sleeve 301, the other end of the lower strip sleeve 501 is fixedly connected to a rectangular fixed rod 503, one end of the rectangular fixed rod 503 is rotatably connected to a second driven sprocket 504, and the second driven sprocket 504 is meshed and connected with the chain 303;

[0043] The present invention includes a lower strip sleeve 501, a second rotating ring 502, a rectangular fixing rod 503 and a second driven sprocket 504 through a lower clamping assembly 5. A pair of second rotating rings 502 at one end of the lower strip sleeve 501 are rotatably connected with a pair of circular protrusions 307 at the lower end of the arc sleeve 301, thereby ensuring the flexible rotation of the lower strip sleeve 501. When the chain 303 contacts the special-shaped tube, the upper strip sleeve 401 and the lower strip sleeve 501 will shrink inward.

[0044] See also Figure 3 - Figure 7 As shown, the elastic component 6 includes a pair of mounting rings 601 , which are fixedly connected to the middle of the upper strip sleeve 401 and the lower strip sleeve 501 , respectively, and the interior of the pair of mounting rings 601 is fixedly connected with a spring rod 602 via a screw 603 .

[0045] See also Figure 1 - Figure 5 As shown, threaded holes are provided at both ends of the mounting frame 2 , the lower end of the mounting frame 2 is fixedly connected to the upper end of the sliding block 104 by bolts, and a strip hole is provided in the middle of the mounting frame 2 .

[0046] See also Fig.10 As shown, the outer ring of the arc sleeve 301 is provided with a pair of vertically symmetrical rectangular holes, and the inner ring of the arc sleeve 301 is provided with an arc hole;

[0047] In the present invention, a pair of vertically symmetrical rectangular holes are provided on the outer ring of the arc-shaped sleeve 301 to facilitate the chain 303 to pass through when changing the form.

[0048] See also Figure 6 As shown, a strip-shaped sliding hole is provided at the lower end of the upper strip-shaped sleeve 401;

[0049] In the present invention, a strip-shaped sliding hole is provided at the lower end of the upper strip-shaped sleeve 401 to slide and limit the rectangular adjusting rod 406 .

[0050] Operation principle: The clamping device for welding special-shaped pipes is mainly composed of a driving component 1, a mounting frame 2, a rotating component 3, an upper clamping component 4, a lower clamping component 5 and an elastic component 6.

[0051] First, the driving assembly 1 includes a base 101, a first servo motor 102, a bidirectional screw 103 and a sliding block 104. When a clamping operation is required, a pair of first servo motors 102 inside the base 101 are started. The output end of the first servo motor 102 starts to rotate, driving the bidirectional screw 103 connected thereto to rotate. Since the bidirectional screw 103 is threadedly connected to the sliding block 104, the rotation of the bidirectional screw 103 enables a pair of sliding blocks 104 to move closer to or farther from each other along the axis direction of the screw. Threaded holes are provided at both upper and lower ends of the mounting frame 2, which are fixedly connected to the upper end of the sliding block 104 by bolts. When the sliding block 104 moves, the mounting frame 2 fixedly connected thereto also moves therewith. A rotating assembly 3 is provided in the middle of the mounting frame 2, and the rotating assembly 3 includes an arc sleeve 301, a semicircular housing 302, a chain 303, a rotating shaft 304, a driving sprocket 305, a second servo motor 306 and a circular protrusion 307. As the mounting frame 2 moves, the arc sleeve 301 is driven to approach the special-shaped tube to be clamped. The chain 303 set inside the arc sleeve 301 gradually approaches the special-shaped tube. Since the chain 303 has a certain flexibility, it can be adaptively deformed according to the shape of the special-shaped tube. At the same time, the upper clamping assembly 4 and the lower clamping assembly 5 will also move accordingly. The upper clamping assembly 4 includes an upper strip sleeve 401, a first rotating ring 402, a limit block 403, a sliding rod 404, a one-way screw rod 405, a rectangular adjustment rod 406, a sliding protrusion 407 and a first driven sprocket 408. A pair of first rotating rings 402 at the lower end of the upper strip sleeve 401 are rotatably connected with a pair of circular protrusions 307 at the upper end of the semicircular shell 302, so that the upper strip sleeve 401 can rotate relatively. The lower clamping assembly 5 includes a lower strip sleeve 501, a second rotating ring 502, a rectangular fixed rod 503 and a second driven sprocket 504. A pair of second rotating rings 502 at one end of the lower strip sleeve 501 are rotatably connected to a pair of circular protrusions 307 at the lower end of the arc sleeve 301, ensuring the flexible rotation of the lower strip sleeve 501. When the chain 303 contacts the special-shaped tube, the upper strip sleeve 401 and the lower strip sleeve 501 will shrink inward. An elastic component 6 is provided between the upper strip sleeve 401 and the lower strip sleeve 501, and the elastic component 6 includes a pair of mounting rings 601 and a spring rod 602 fixedly connected to the inside of the mounting ring 601 by screws 603. When the upper strip sleeve 401 and the lower strip sleeve 501 shrink inward, the spring rod 602 in the middle will be squeezed. The elasticity of the spring rod 602 provides a stable clamping force for clamping. Moreover, the spring rods 602 with different elastic forces can be replaced according to the actual clamping requirements to adapt to the special-shaped tubes of different specifications and shapes to ensure the firmness and stability of the clamping. During the welding process, if the special-shaped tube needs to be turned over, the second servo motor 306 is started. The output end of the second servo motor 306 drives the rotating shaft 304 to rotate, and the driving sprocket 305 fixedly connected to the middle of the rotating shaft 304 rotates accordingly.The driving sprocket 305 is meshed and connected with the chain 303, and the rotation of the driving sprocket 305 drives the chain 303 to move. The chain 303 drives the special-shaped tube to rotate through the friction force with the surface of the special-shaped tube, realizes the turning over, facilitates the welding operation, and greatly improves the efficiency and quality of welding. When it is necessary to clamp a special-shaped tube with a larger diameter, the two sets of mounting frames 2 can be fixed to each other by bolts. In this way, the rotating component 3, the upper clamping component 4, the lower clamping component 5 and the elastic component 6 are superimposed and linked to each other. At the same time, the extended chain 303 is replaced to form a new clamping form, as shown in Figure 4. This structure can better meet the clamping requirements of large-diameter special-shaped tubes, and further improves the adaptability and versatility of the device.

[0052] For example, for a special-shaped tube with a D-shaped cross-section, when clamping, the chain 303 can fit its irregular surface, and the upper clamping assembly 4 and the lower clamping assembly 5 adjust the angle and position accordingly, and the elastic assembly 6 provides appropriate clamping force to ensure that the special-shaped tube is firmly clamped. When turning over is required during welding, the rotation of the chain 303 drives the special-shaped tube to turn over smoothly, which is convenient for all-round welding operations. For another example, for a special-shaped tube with an elliptical cross-section, the chain 303 can also adapt to its curved shape to achieve effective clamping and rotation during welding.

[0053] In summary, the clamping device for welding special-shaped pipes can flexibly adapt to the clamping requirements of special-shaped pipes with different cross-sections through the coordinated work between various components, and can conveniently realize the rotation of the special-shaped pipes during the welding process, thereby improving the efficiency and quality of welding, and has strong versatility and practicality.

[0054] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0055] In addition, it should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that those skilled in the art can understand.

Claims

1. A clamping device for welding special-shaped pipes, characterized in that: It comprises a driving assembly (1), wherein a plurality of mounting frames (2) are provided at the upper end of the driving assembly (1), a rotating assembly (3) is provided in the middle of the mounting frame (2), an upper clamping assembly (4) is provided at the upper end of the rotating assembly (3), a lower clamping assembly (5) is provided at the lower end of the rotating assembly (3), and an elastic assembly (6) is provided between the upper clamping assembly (4) and the lower clamping assembly (5); The driving assembly (1) comprises a base (101), a pair of first servo motors (102) are fixedly connected inside the base (101), a pair of mutually symmetrical bidirectional screw rods (103) are rotatably connected inside the base (101), one end of the pair of bidirectional screw rods (103) are respectively fixedly connected to the output ends of the pair of first servo motors (102), and a pair of sliding blocks (104) are connected to the middle of the bidirectional screw rods (103) via threads; The rotating assembly (3) comprises an arc-shaped sleeve (301) fixedly connected to the inside of the mounting frame (2); a semicircular housing (302) is fixedly connected to the middle of the arc-shaped sleeve (301); a chain (303) is sleeved inside the arc-shaped sleeve (301); a rotating shaft (304) is rotatably connected to the inside of the semicircular housing (302); a driving sprocket (305) is fixedly connected to the middle of the rotating shaft (304); the driving sprocket (305) is meshingly connected to the chain (303); a second servo motor (306) is fixedly connected to the outside of the semicircular housing (302); an output end of the second servo motor (306) is fixedly connected to one end of the rotating shaft (304); and a pair of circular protrusions (307) are fixedly connected to the upper and lower ends of the arc-shaped sleeve (301); The upper clamping assembly (4) comprises an upper strip-shaped sleeve (401), the lower end of which is fixedly connected to a pair of first rotating circular rings (402), the pair of first rotating circular rings (402) being rotatably connected to a pair of circular protrusions (307) at the upper end of the semicircular housing (302), the lower end of which is fixedly connected to two pairs of limit blocks (403), a pair of the limit blocks (403) being fixedly connected to a sliding rod (404), and the other pair of the limit blocks (403) being rotatably connected to a one-way screw rod. (405), a rectangular adjustment rod (406) is provided between the sliding rod (404) and the one-way screw rod (405), and sliding protrusions (407) are fixedly connected to the front and rear sides of the rectangular adjustment rod (406), the sliding protrusion (407) at the front end is slidably connected to the sliding rod (404), and the sliding protrusion (407) at the rear end is threadedly connected to the one-way screw rod (405), and one end of the rectangular adjustment rod (406) is rotatably connected to a first driven sprocket (408), and the first driven sprocket (408) is meshingly connected to the chain (303); The lower clamping assembly (5) comprises a lower strip sleeve (501), one end of the lower strip sleeve (501) is fixedly connected to a pair of second symmetrical rotating circular rings (502), the pair of second rotating circular rings (502) are respectively rotatably connected to a pair of circular protrusions (307) at the lower end of the arc sleeve (301), the other end of the lower strip sleeve (501) is fixedly connected to a rectangular fixing rod (503), one end of the rectangular fixing rod (503) is rotatably connected to a second driven sprocket (504), and the second driven sprocket (504) is meshingly connected to the chain (303); The elastic component (6) comprises a pair of mounting rings (601), the pair of mounting rings (601) being fixedly connected to the middle parts of the upper strip sleeve (401) and the lower strip sleeve (501) respectively, and the interiors of the pair of mounting rings (601) are fixedly connected to spring rods (602) via screws (603).

2. The clamping device for welding special-shaped pipes according to claim 1, characterized in that: Threaded holes are provided at both upper and lower ends of the mounting frame (2); the lower end of the mounting frame (2) is fixedly connected to the upper end of the sliding block (104) via bolts; and a strip hole is provided in the middle of the mounting frame (2).

3. The clamping device for welding special-shaped pipes according to claim 1, characterized in that: The outer ring of the arc-shaped sleeve (301) is provided with a pair of vertically symmetrical rectangular holes, and the inner ring of the arc-shaped sleeve (301) is provided with an arc-shaped hole.

4. The clamping device for welding special-shaped pipes according to claim 1, characterized in that: A strip-shaped sliding hole is provided at the lower end of the upper strip-shaped sleeve (401).

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