Metal pipe welding machining device

Abstract

The invention discloses a metal pipe welding processing device, which relates to the technical field of metal welding and comprises a base, a welding gun is fixedly mounted on the left side of the base, two sliding chassis are slidably mounted at the top of the base, two U-shaped frames are fixedly mounted at the top of the base, and a cross beam is fixedly connected between the two U-shaped frames. A threaded rod rotationally penetrates through the position between the two sliding base plates, a first gear is fixedly installed on the circumferential face of the threaded rod, and clamping pipes are slidably installed at the tops of the sliding base plates. A limiting ejector rod makes contact with a limiting plug pin and limits the limiting plug pin, so that when a double-layer clamping plate detects that a thick spring is compressed due to the fact that the clamping force is too large, a threaded inlet rod is limited in time, that is, the double-layer clamping plate can be stopped from continuously applying pressure to a metal pipe in time, and deformation generated when the thin metal pipe is clamped is avoided; and meanwhile, a small triangular block indirectly performs air injection cleaning on the interior of the clamping pipe through a contact pressing type air valve.

Description

Technical Field

[0001] The invention relates to the technical field of metal welding, in particular to a metal pipe welding processing device. Background Art

[0002] The metal pipe welding processing device is usually used for clamping metal pipe workpieces when welding, with the aim of avoiding position displacement of the workpiece during welding as much as possible, thereby affecting the welding quality.

[0003] The patent with the patent announcement number CN222536769U relates to the field of metal tube processing technology. The patent includes a processing table and a mounting plate. A motor is installed on one surface of the mounting plate, and the motor is connected to a main gear. A limit groove is provided on one surface of the mounting plate, and a limit rod is installed in the limit groove. The limit rod is connected to a sub-gear. A placement groove is provided on one surface of the sub-gear, and a mounting column is installed in the placement groove. A fixing rod is installed in the mounting column, and the fixing rod is connected to a fixing plate. A connecting groove is provided on one surface of the mounting column, and a sliding rod is installed in the connecting groove. A nut is installed on the side surface of the sliding rod. The patent places the metal tubes to be welded in two placement grooves respectively by setting a motor, a fixing rod and a fixing plate, and pulls the sliding rod, which drives the fixing rod to extend and retract, and further drives the fixing plate to move, thereby fixing the metal tube. The motor rotates the metal tube through the meshing between the gears, thereby realizing welding under the metal tube, and the operation is simple.

[0004] In the above patent, a satisfactory effect is achieved through a relatively simple structure, and the metal tube can be rotated during the clamping process to ensure the welding quality. However, if the clamping device cannot be limited in time when clamping a metal tube with a thin inner wall, the metal tube may be deformed during the clamping process, which may affect the welding position and quality. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a metal pipe welding processing device, which solves the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A metal pipe welding and processing device, including a base, a welding torch is fixedly installed on the left side of the base, two sliding chassis are slidably installed on the top of the base, two U-shaped frames are fixedly installed on the top of the base, a cross beam is fixedly connected between the two U-shaped frames, a threaded rod is rotatably penetrated between the two sliding chassis, a first gear is fixedly installed on the circumferential surface of the threaded rod, a clamping pipe is slidably installed on the top of the sliding chassis, a synchronous groove is opened on the circumferential surface of the clamping pipe, an annular groove is opened inside the clamping pipe, a second gear is rotatably installed on the circumferential surface of the inner wall of the annular groove, an annular rack is slidably installed on the circumferential surface of the inner wall of the annular groove, a threaded feed rod penetrates through the top of the second gear, a double-layer clamping plate is fixedly installed at the bottom of the threaded feed rod, a limiting pin is rotatably installed on the top of the double-layer clamping plate, a limiting pin groove is opened on the circumferential surface of the bottom of the threaded feed rod, a limiting top rod is fixedly installed at the bottom of the double-layer clamping plate, a push-button air valve is fixedly installed on the inner wall of the annular groove, a small triangular block is fixedly installed on the circumferential surface of the annular rack, and an air nozzle is fixedly installed inside the clamping pipe. By the limiting top rod contacting the limiting pin and limiting it, when the double-layer clamping plate detects that the clamping force is too large and causes the thick spring to compress, the threaded feed rod can be limited in time, that is, the double-layer clamping plate can be stopped from continuously applying pressure to the metal pipe in time, avoiding deformation when clamping a thinner metal pipe. At the same time, the small triangular block indirectly jets air into the clamping pipe for cleaning by contacting the push-button air valve.

[0007] According to the above technical solutions, the first gear contacts the inner wall of the synchronous groove, the threaded rod is threadedly connected with the sliding chassis, the second gear meshes with the annular rack, an air pump is fixedly installed on the left side of the base, the air pump is communicated with the push-button air valve through a first air pipe, the push-button air valve is communicated with the air nozzle through a second air pipe, the limiting pin contacts the limiting pin groove, the limiting pin is located on the movement track of the limiting top rod, a detection plate is arranged at the bottom of the double-layer clamping plate, a thick spring is arranged between the detection plate and the double-layer clamping plate, the push-button air valve is located on the movement track of the small triangular block, an inner hexagonal pipe is fixedly installed at the top of the threaded feed rod, and the threaded feed rod is threadedly connected with the clamping pipe. The meshing of the second gear and the annular rack realizes the mutual transmission between the two, that is, only by rotating one of the second gears, the other gears meshing with the annular rack can rotate at the same speed at the same time, thereby improving the clamping stability.

[0008] According to the above technical solutions, a T-shaped box is slidably installed on the side of the cross beam, a grinding plate is slidably installed on the side of the cross beam, the rear part of the T-shaped box is rotatably connected with the front part of the grinding plate through a rotating connecting rod, a sliding block is slidably installed at the front end of the grinding plate, and a grinding sand block is arranged at the front part of the grinding plate. The sliding block enables the device to replace the grinding sand block more conveniently, improving the continuity of the device during continuous operation.

[0009] According to the above technical solution, a cylinder is fixedly installed inside the T-shaped box. A first piston rod is slidably installed at the top inner wall of the cylinder. The top of the first piston rod is fixedly connected to the side of the cross beam. A second piston rod is slidably installed at the bottom inner wall of the cylinder. A trapezoidal top block is fixedly installed at the bottom of the T-shaped box. By sliding the first piston rod to squeeze the gas to drive the second piston rod to slide, it realizes that after the metal pipe is polished for a certain time, the polishing plate and the polishing sand block are pushed upward to disengage from the metal pipe, avoiding the polishing plate from hindering the subsequent welding operation.

[0010] According to the above technical solution, a return spring is arranged between the sliding block and the T-shaped box. The rotating link is located on the movement track of the second piston rod. The first piston rod penetrates through the side of the T-shaped box. The sliding block contacts the side of the polishing sand block. The elastic force of the return spring further simplifies the process of replacing the polishing sand block, making it only necessary to push it in when replacing a new polishing sand block.

[0011] According to the above technical solution, a rubber ring is fixedly installed on the circumferential surface of the rear part of the clamping pipe. A protective cover is slidably installed at the rear part of the clamping pipe. A support bar is fixedly connected between the rubber ring and the protective cover. A fixed support plate is fixedly installed at the rear part of the sliding chassis. A fixed connecting block is slidably installed at the top of the fixed support plate. The top of the fixed connecting block is fixedly connected to the bottom of the protective cover. By the rubber ring being squeezed to drive the protective cover to extend, it realizes the protection of the welding part before the formal welding, weakening the strong light generated by welding and preventing spark splash.

[0012] According to the above technical solution, a scraping block is fixedly installed inside the clamping pipe. A rotating brush is rotatably installed on the side of the fixed connecting block through a connecting block. The scraping block and the rotating brush realize the cleaning of metal debris inside and outside the protective cover respectively, avoiding the accumulation of metal debris, which may cause jamming during the extension process of the protective cover, and improving the stability of the device during long-term operation.

[0013] According to the above technical solution, the bottom of the scraping block contacts the inner wall of the protective cover. Thread grooves are formed on the circumferential surface of the rotating brush. A transmission thin rod is fixedly installed at the bottom of the protective cover. The bottom of the transmission thin rod contacts the inner wall of the thread groove. The trapezoidal top block is located on the movement track of the rubber ring. The sliding of the protective cover drives the rotating brush to rotate through the transmission thin rod, enabling the rotating brush to rotate while sliding together with the sliding chassis, thereby improving the cleaning efficiency.

[0014] The present invention provides a metal pipe welding and processing device. It has the following beneficial effects: (1). In this invention, when the double-layer clamping plates detect that the clamping force is too large, causing the thick spring to compress, the limiting ejector rod contacts the limiting pin and limits it, so as to limit the threaded feed rod in time, that is, it can stop the double-layer clamping plates from continuously applying pressure to the metal pipe in time, avoiding deformation when clamping a thin metal pipe. At the same time, the small triangular block indirectly jets air into the clamped pipe through the contact push-type air valve to clean it, avoiding metal debris between the double-layer clamping plates and the metal pipe, which may cause scratches on the circumferential surface of the metal pipe, and further improving the overall processing quality of the device.

[0015] (2). In this invention, the grinding plate and the grinding sand block are used to grind the end face of the metal pipe before welding, avoiding the influence of factors such as rust on the end face of the metal pipe on the welding quality. The sliding block and the return spring simplify the operation process of replacing the grinding sand block, making the overall operation of the device more smooth. At the same time, through the first piston rod and the second piston rod, before the formal welding starts, the grinding plate is pushed above the device to separate it from the metal pipe to avoid the grinding plate from hindering the welding process, further improving the automation degree of the device.

[0016] (3). In this invention, the trapezoidal top block drives the support bar and the protective cover through the contact rubber ring, realizing that the protective cover automatically extends during the welding process to weaken the strong light generated during welding and avoid the sparks from splashing, improving the safety of the operator during operation. At the same time, the scraping block and the rotating brush indirectly clean the inside of the protective cover and the top of the base, avoiding the accumulation of metal debris generated during welding, which may affect the overall operation of the device. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the first gear of the present invention; Figure 3 It is a schematic diagram of the internal structure of the clamped pipe of the present invention; Figure 4 It is a schematic diagram of the structure of the limiting pin and the limiting ejector rod of the present invention; Figure 5 It is a schematic diagram of the position structure of the T-shaped box and the grinding plate of the present invention; Figure 6 It is a schematic diagram of the internal structure of the T-shaped box of the present invention; Figure 7 It is a schematic diagram of the structure of the rubber ring and the protective cover of the present invention; Figure 8 It is a schematic diagram of the structure of the rotating brush and the scraping block of the present invention.

[0018] In the figure: 1. Base; 2. Welding torch; 3. Sliding chassis; 4. U-shaped frame; 5. Cross beam; 6. Threaded rod; 7. Gear 1; 8. Clamping tube; 901. Gear 2; 902. Ring rack; 903. Double-layer splint; 904. Limit pin; 905. Limit ejector rod; 906. Pressurized air valve; 907. Air nozzle; 1001. T-shaped box; 1002. Grinding plate; 1003. Cylinder; 1004. Piston rod 1; 1005. Piston rod 2; 1006. Trapezoidal top block; 1007. Sliding block; 1101. Rubber ring; 1102. Support bar; 1103. Protective cover; 1104. Scraping block; 1105. Fixed support plate; 1106. Fixed connecting block; 1107. Rotary brush; 12. Air pump. Detailed implementation manner

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to Figures 1 - 8 , a metal pipe welding and processing device, including a base 1, a welding torch 2 is fixedly installed on the left side of the base 1, two sliding chassis 3 are slidably installed on the top of the base 1, two U-shaped frames 4 are fixedly installed on the top of the base 1, a cross beam 5 is fixedly connected between the two U-shaped frames 4, a threaded rod 6 is rotatably penetrated between the two sliding chassis 3, a gear 1 7 is fixedly installed on the circumferential surface of the threaded rod 6, a clamping tube 8 is slidably installed on the top of the sliding chassis 3, a synchronous groove is opened on the circumferential surface of the clamping tube 8, an annular groove is opened inside the clamping tube 8, a gear 2 901 is rotatably installed on the circumferential surface of the inner wall of the annular groove, a ring rack 902 is slidably installed on the circumferential surface of the inner wall of the annular groove, a threaded feed rod penetrates through the top of the gear 2 901, a double-layer splint 903 is fixedly installed at the bottom of the threaded feed rod, a limit pin 904 is rotatably installed at the top of the double-layer splint 903, a limit pin groove is opened on the circumferential surface of the bottom of the threaded feed rod, a limit ejector rod 905 is fixedly installed at the bottom of the double-layer splint 903, a pressurized air valve 906 is fixedly installed on the inner wall of the annular groove, a small triangular block is fixedly installed on the circumferential surface of the ring rack 902, an air nozzle 907 is fixedly installed inside the clamping tube 8. By the limit ejector rod 905 contacting the limit pin 904 and limiting it, when the double-layer splint 903 detects that the clamping force is too large and causes the thick spring to be compressed, the threaded feed rod can be limited in time, that is, the double-layer splint 903 can be stopped from continuously applying pressure to the metal pipe in time, avoiding deformation when clamping a thinner metal pipe. At the same time, the small triangular block indirectly jets air into the clamping tube 8 by contacting the pressurized air valve 906 for cleaning.

[0021] Gear 1 7 is in contact with the inner wall of the synchronous groove. The threaded rod 6 is threadedly connected to the sliding chassis 3. Gear 2 901 meshes with the annular rack 902. An air pump 12 is fixedly installed on the left side of the base 1. The air pump 12 is connected to the push-button air valve 906 through the first air pipe. The push-button air valve 906 is connected to the air nozzle 907 through the second air pipe. The limit pin 904 is in contact with the limit pin groove. The limit pin 904 is located on the movement track of the limit ejector rod 905. A detection plate is arranged at the bottom of the double-layer clamp 903. A thick spring is arranged between the detection plate and the double-layer clamp 903. The push-button air valve 906 is located on the movement track of the small triangular block. The top of the threaded feed rod is fixedly installed with an internal hexagonal pipe. The threaded feed rod is threadedly connected to the clamping pipe 8. The meshing of Gear 2 901 and the annular rack 902 realizes the mutual transmission between the two, that is, only by rotating one of the Gear 2 901s, the other gears meshing with the annular rack 902 can rotate at the same speed simultaneously, thereby improving the clamping stability.

[0022] A T-shaped box 1001 is slidably installed on the side of the cross beam 5. A grinding plate 1002 is slidably installed on the side of the cross beam 5. The rear part of the T-shaped box 1001 is rotatably connected to the front part of the grinding plate 1002 through a rotating connecting rod. A sliding block 1007 is slidably installed at the front end of the grinding plate 1002. Grinding sand blocks are arranged at the front part of the grinding plate 1002. The sliding block 1007 enables the device to replace the grinding sand blocks more conveniently and improves the continuity of the device during continuous operation.

[0023] A cylinder 1003 is fixedly installed inside the T-shaped box 1001. A first piston rod 1004 is slidably installed at the top inner wall of the cylinder 1003. The top of the first piston rod 1004 is fixedly connected to the side of the cross beam 5. A second piston rod 1005 is slidably installed at the bottom inner wall of the cylinder 1003. A trapezoidal top block 1006 is fixedly installed at the bottom of the T-shaped box 1001. By the first piston rod 1004 sliding and squeezing the gas to drive the second piston rod 1005 to slide, it realizes that after grinding the metal pipe for a certain time, the grinding plate 1002 and the grinding sand blocks are pushed upward to be separated from the metal pipe, avoiding the grinding plate 1002 from hindering the subsequent welding operation.

[0024] A return spring is arranged between the sliding block 1007 and the T-shaped box 1001. The rotating connecting rod is located on the movement track of the second piston rod 1005. The first piston rod 1004 penetrates through the side of the T-shaped box 1001. The sliding block 1007 is in contact with the side of the grinding sand block. The elastic force of the return spring further simplifies the process of replacing the grinding sand blocks, making it only necessary to push the new grinding sand blocks in when replacing them.

[0025] A rubber ring 1101 is fixedly installed on the circumferential surface of the rear part of the clamping tube 8, and a protective cover 1103 is slidably installed on the rear part of the clamping tube 8. A support bar 1102 is fixedly connected between the rubber ring 1101 and the protective cover 1103. A fixed support plate 1105 is fixedly installed on the rear part of the sliding chassis 3. A fixed connecting block 1106 is slidably installed on the top of the fixed support plate 1105. The top of the fixed connecting block 1106 is fixedly connected to the bottom of the protective cover 1103. When the rubber ring 1101 is squeezed, the protective cover 1103 is driven to extend, realizing the protection of the welding part before welding, weakening the strong light generated by welding and preventing the generation of spark splashing.

[0026] A scraping block 1104 is fixedly installed inside the clamping tube 8. A rotary brush 1107 is rotatably installed on the side of the fixed connecting block 1106 through a connecting block. The scraping block 1104 and the rotary brush 1107 realize the cleaning of metal debris inside and outside the protective cover 1103 respectively, avoiding the accumulation of metal debris and causing jamming during the extension of the protective cover 1103, and improving the stability of the device during long-term operation.

[0027] The bottom of the scraping block 1104 contacts the inner wall of the protective cover 1103. A thread groove is formed on the circumferential surface of the rotary brush 1107. A transmission thin rod is fixedly installed at the bottom of the protective cover 1103. The bottom of the transmission thin rod contacts the inner wall of the thread groove. The trapezoidal top block 1006 is located on the movement track of the rubber ring 1101. The sliding of the protective cover 1103 drives the rotary brush 1107 to rotate through the transmission thin rod, so that the rotary brush 1107 rotates while sliding together with the sliding chassis 3, thus improving the cleaning efficiency.

[0028] During operation: before the device welds the metal tube, put the metal tube into the clamping tube 8, then use a hexagonal wrench to insert it into the inner hexagonal tube and rotate it. The rotation of the inner hexagonal tube drives the threaded feed rod to rotate together. When the threaded feed rod rotates, it drives the limit pin 904 to rotate together through the limit pin groove. Since the threaded feed rod is threadedly connected to the clamping tube 8, the threaded feed rod slides downward while rotating. The downward sliding of the threaded feed rod drives the double-layer clamping plate 903 and the detection plate to slide together until the bottom of the detection plate contacts the circumferential surface of the metal tube. When the detection plate contacts the metal tube, if the inner hexagonal tube continues to be rotated, the bottom of the detection plate will squeeze the thick spring under the pressure of the metal tube and drive the limit push rod 905 to slide upward at the same time. The limit push rod 9 After sliding upward, 05 contacts and limits the limit pin 904, making the limit pin 904 unable to transmit any more. If the limit pin 904 cannot rotate, the limit pin groove makes the threaded feed rod unable to continue to rotate. However, since the limit push rod 905 only contacts one side of the limit pin 904, the limit pin 904 can still rotate in the opposite direction after being limited. Therefore, if the threaded feed rod continues to rotate after the detection plate contacts the metal tube, it will be limited immediately so that it cannot continue to rotate. However, after limiting, the threaded feed rod can still rotate in the opposite direction, that is, rotate in the opposite direction to make the detection plate out of contact with the metal tube, thereby avoiding deformation of the metal tube and affecting the processing quality due to poor control of the clamping force when clamping a thinner metal tube. At the same time, the rotation of the threaded feed rod drives gear 2 901 to rotate together, and the rotation of gear 2 901 drives the annular rack 902 to rotate. The rotation of the annular rack 902 drives the small triangular block to rotate and makes the small triangular block contact with the push-type air valve 906 and open the push-type air valve 906. After the push-type air valve 906 is opened, the gas flows out from the air pump 12, passes through the air pipe 1, the push-type air valve 906 and the air pipe 2, and is finally ejected from the air nozzle 907, thereby realizing the jet cleaning of the inside of the clamping tube 8 when clamping the metal tube, avoiding the residual metal debris inside it causing scratches on the circumferential surface of the metal tube to affect the overall processing quality.

[0029] After the clamping operation of the metal pipe is completed, the operator rotates the threaded rod 6. Since the threaded rod 6 is threadedly connected to the sliding chassis 3, the rotation of the threaded rod 6 drives the sliding chassis 3 and the clamping pipe 8 to slide together. While rotating the threaded rod 6, it drives the first gear 7 to rotate together. Since the first gear 7 contacts the inner wall of the synchronous groove, the rotation of the first gear 7 drives the clamping pipe 8 to rotate together. During the sliding process of the clamping pipe 8, it drives the metal pipe to slide together until its end face contacts the grinding sand plate. Since the clamping pipe 8 rotates while sliding, the end face of the metal pipe is ground after it contacts the grinding sand plate. To prevent the end face of the metal pipe from rusting and affecting the welding quality. When the clamping pipe 8 slides, it drives the trapezoidal top block 1006 to slide upward through contact. The sliding of the trapezoidal top block 1006 drives the cylinder 1003 to slide upward together. Since the first piston rod 1004 is fixedly connected to the cross beam 5, when the cylinder 1003 slides upward, the first piston rod 1004 slides downward relative to the cylinder 1003. The sliding of the first piston rod 1004 drives the second piston rod 1005 to slide by squeezing the air inside the cylinder 1003. During the sliding process of the second piston rod 1005, it drives the rotating link to rotate upward through contact. The rotation of the rotating link drives the grinding plate 1002 and the grinding sand block to slide upward together, that is, after grinding the end face of the metal pipe for a certain period of time, the first piston rod 1004 and the second piston rod 1005 drive it to slide upward so that the grinding sand block is separated from the end face of the metal pipe, avoiding the grinding plate 1002 continuously grinding the metal pipe and hindering the subsequent welding work.

[0030] During the sliding process of the clamping tube 8, the rubber ring 1101 is driven to contact the trapezoidal top block 1006, and the rubber ring 1101 is subjected to a downward extrusion force. After being extruded, the rubber ring 1101 drives one end of the support strip 1102 connected to it to slide downward. When the top of the support strip 1102 slides downward, it drives the bottom of the support strip 1102 to slide backward, thereby driving the protective cover 1103 to slide backward together. That is, before welding, the protective cover 1103 is extended to weaken the strong light generated during the welding process. At the same time, the protective cover 1103 is fixedly connected to the rear part of the sliding chassis 3 through the fixed connecting block 1106 and the fixed support plate 1105, so that when the clamping tube 8 rotates, it does not drive the protective cover 1103 to rotate together. That is, it avoids the influence on the welding of the metal tube by the welding torch 2 caused by the rotation of the protective cover 1103. When the clamping tube 8 rotates, it drives the scraping block 1104 to rotate together. The scraping block 1104 scrapes the metal debris accumulated on the inner wall of the protective cover 1103 by contacting the inner wall of the protective cover 1103. At the same time, when the protective cover 1103 extends, it drives the transmission thin rod to slide together. Since the transmission thin rod contacts the spiral groove of the rotary brush 1107, the sliding of the protective cover 1103 drives the rotary brush 1107 to rotate to sweep away the metal debris accumulated on the top of the base 1, thereby avoiding the accumulation of metal debris and affecting the normal extension of the protective cover 1103.

[0031] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A metal pipe welding and processing device, comprising a base (1), characterized in that: A welding torch (2) is fixedly installed on the left side of the base (1). Two sliding chassis (3) are slidably installed on the top of the base (1). Two U-shaped frames (4) are fixedly installed on the top of the base (1). A cross beam (5) is fixedly connected between the two U-shaped frames (4). A threaded rod (6) is rotatably penetrated between the two sliding chassis (3). A first gear (7) is fixedly installed on the circumferential surface of the threaded rod (6). A clamping pipe (8) is slidably installed on the top of the sliding chassis (3). A synchronous groove is formed on the circumferential surface of the clamping pipe (8). An annular groove is formed inside the clamping pipe (8). A second gear (901) is rotatably installed on the circumferential surface of the inner wall of the annular groove. An annular rack (902) is slidably installed on the circumferential surface of the inner wall of the annular groove. A threaded feed rod penetrates through the top of the second gear (901). A double-layer clamping plate (903) is fixedly installed at the bottom of the threaded feed rod. A limit pin (904) is rotatably installed on the top of the double-layer clamping plate (903). A limit pin groove is formed on the circumferential surface of the bottom of the threaded feed rod. A limit ejector rod (905) is fixedly installed at the bottom of the double-layer clamping plate (903). A push-button air valve (906) is fixedly installed on the inner wall of the annular groove. A small triangular block is fixedly installed on the circumferential surface of the annular rack (902). An air nozzle (907) is fixedly installed inside the clamping pipe (8).

2. A metal tube welding and processing device according to claim 1, characterized in that: The first gear (7) is in contact with the inner wall of the synchronous groove. The threaded rod (6) is threadedly connected with the sliding chassis (3). The second gear (901) is engaged with the annular rack (902). An air pump (12) is fixedly installed on the left side of the base (1). The air pump (12) is communicated with the push-button air valve (906) through a first air pipe. The push-button air valve (906) is communicated with the air nozzle (907) through a second air pipe. The limit pin (904) is in contact with the limit pin groove. The limit pin (904) is located on the movement track of the limit ejector rod (905). A detection plate is arranged at the bottom of the double-layer clamping plate (903). A thick spring is arranged between the detection plate and the double-layer clamping plate (903). The push-button air valve (906) is located on the movement track of the small triangular block. An internal hexagonal pipe is fixedly installed at the top of the threaded feed rod. The threaded feed rod is threadedly connected with the clamping pipe (8).

3. The metal pipe welding and processing device according to claim 2, characterized in that: A T-shaped box (1001) is slidably installed on the side of the cross beam (5). A grinding plate (1002) is slidably installed on the side of the cross beam (5). The rear part of the T-shaped box (1001) is rotatably connected with the front part of the grinding plate (1002) through a rotating connecting rod. A sliding block (1007) is slidably installed at the front end of the grinding plate (1002). Grinding sand blocks are arranged at the front part of the grinding plate (1002).

4. A metal tube welding and processing device according to claim 3, characterized in that: Inside the T-shaped box (1001), a cylinder (1003) is fixedly installed. Inside the inner wall of the cylinder (1003), a first piston rod (1004) is slidably installed. The top of the first piston rod (1004) is fixedly connected to the side of the cross beam (5). Inside the bottom inner wall of the cylinder (1003), a second piston rod (1005) is slidably installed. At the bottom of the T-shaped box (1001), a trapezoidal top block (1006) is fixedly installed.

5. The metal pipe welding and processing device according to claim 4, characterized in that: A return spring is arranged between the sliding block (1007) and the T-shaped box (1001). The rotating connecting rod is located on the movement track of the second piston rod (1005). The first piston rod (1004) penetrates through the side of the T-shaped box (1001). The sliding block (1007) is in contact with the side of the grinding sand block.

6. The metal tube welding and processing device according to claim 5, characterized in that: On the circumferential surface at the rear of the clamping pipe (8), a rubber ring (1101) is fixedly installed. A protective cover (1103) is slidably installed at the rear of the clamping pipe (8). Between the rubber ring (1101) and the protective cover (1103), a support strip (1102) is fixedly connected. At the rear of the sliding chassis (3), a fixed support plate (1105) is fixedly installed. On the top of the fixed support plate (1105), a fixed connecting block (1106) is slidably installed. The top of the fixed connecting block (1106) is fixedly connected to the bottom of the protective cover (1103).

7. A metal pipe welding and processing device according to claim 6, characterized in that: Inside the clamping pipe (8), a scraping block (1104) is fixedly installed. On the side of the fixed connecting block (1106), a rotary brush (1107) is rotatably installed through a connecting block.

8. A metal tube welding and processing device according to claim 7, characterized in that: The bottom of the scraping block (1104) is in contact with the inner wall of the protective cover (1103). Threaded grooves are formed on the circumferential surface of the rotary brush (1107). At the bottom of the protective cover (1103), a transmission thin rod is fixedly installed. The bottom of the transmission thin rod is in contact with the inner wall of the threaded groove. The trapezoidal top block (1006) is located on the movement track of the rubber ring (1101).

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