An alloy steel pipe welding device

Abstract

The application belongs to the technical field of alloy steel pipe welding, in particular to an alloy steel pipe welding device, which comprises a base plate, a feeding table is installed on the base plate, a translation mechanism is arranged behind the feeding table, a fixing arm is arranged on the translation mechanism, a laser welding head is fixedly installed at the end of the fixing arm, a fixing frame is also fixedly installed on the base plate, a first cylinder for driving a fixing sleeve is fixedly installed on the fixing frame, and a fixer for pressing down the pipe is rotatably installed on the fixing sleeve. Through the cooperation of the fixer, the feeding table and the translation mechanism, the T-shaped butt joint of two groups of pipes can be fixed, the laser welding head can be welded around the butt joint of the two groups of pipes without circumferential movement, the excessive dragging of the laser welding head on the wire is avoided, and the interference of the wire on the laser welding head is avoided.

Description

Technical Field

[0001] This invention belongs to the field of lithium battery tab processing technology, specifically an alloy steel pipe welding device. Background Technology

[0002] Welded pipes are widely used in the automotive industry and are one of the important basic materials for automobile manufacturing. Welded pipes (welded steel pipes) mainly include three categories: carbon steel welded pipes, low alloy steel pipes, and stainless steel welded pipes. During the production and processing of welded pipes, laser welding is required. The welding methods of welded pipes mainly consist of end-to-end butt welding and T-butt welding. Different welding methods are processed by different laser welding equipment. The laser welding equipment used for T-butt welding has a relatively complex structure and needs to be improved.

[0003] Patent CN217586128U discloses a welding device for guide seams in welded pipes, integrating modules for clamping and centering, welding, drive positioning, and guide seam grinding. This device, through the coordinated use of clamping and centering and drive positioning components, can precisely clamp and position welded pipes in both vertical and horizontal positions, ensuring a stable and reliable welding process. Simultaneously, the system features intersection line following and automatic welding torch height adjustment functions, ensuring the welding torch is always in the optimal welding position, effectively eliminating height differences and significantly improving weld consistency. The guide seam grinding component performs rotational pretreatment on the welding area, further optimizing the welding environment. The entire system achieves full automation of the guide seam welding process for welded pipes, significantly improving production efficiency while ensuring high-quality welding, without requiring manual intervention.

[0004] In the above solution, the welding torch needs to be driven to move around the weld seam, which requires the welding torch to rotate 360 ​​degrees. Since the tail of the welding torch is connected to the host via a wire, if the welding torch needs to rotate 360 ​​degrees, it is not conducive to the laying of the wire, and the wire will interfere with the rotation of the welding torch. Therefore, the present invention provides an alloy steel pipe welding device. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: The alloy steel pipe welding device of the present invention includes a base plate, a feeding platform installed on the base plate, a translation mechanism arranged behind the feeding platform, a fixed arm arranged on the translation mechanism, a laser welding head fixedly installed at the end of the fixed arm, a fixed frame fixedly installed on the base plate, a first cylinder for driving the fixed sleeve fixedly installed on the fixed frame, a fixture for pressing down the pipe rotatably installed on the fixed sleeve, the feeding platform includes a fixed platform, the fixed platform is fixedly installed on the base plate, a turntable rotatably installed on the fixed platform, a feeding box for placing the pipe fixedly installed on the turntable, a gearbox installed at the bottom of the fixed platform, and a motor driving the turntable to rotate through the gearbox; By coordinating the fixture, feeding platform, and translation mechanism, not only is the T-shaped connection of the two sets of pipes fixed, but the laser welding head can also weld around the connection point of the two sets of pipes without making circular motion, thus avoiding excessive dragging of the wire by the laser welding head and preventing interference from the wire to the laser welding head.

[0007] Preferably, the fixing frame has two sets of through holes symmetrically opened, and two sets of sliding rods are inserted into the two sets of through holes. The lower ends of the two sets of sliding rods are respectively connected to the two ends of the fixing sleeve. As the first cylinder drives the fixing sleeve to move downwards together with the fixing device, the fixing sleeve drives the sliding rod to slide along the through hole, which guides the movement of the fixing device.

[0008] Preferably, the fixture includes an outer column, a fixed sleeve rotatably mounted on the outer column, an inner column movably inserted into the outer column, a rotatably connected screw connector at the upper end of the inner column, two sets of movable frames symmetrically and movably mounted on the lower end of the outer column, guide wheels rotatably mounted on the movable frames, two sets of guide columns symmetrically mounted on the movable frames, a first spring sleeved on the guide columns, two sets of guide frames symmetrically and movably mounted on the lower end of the outer column, guide columns inserted into the guide frames, a support frame fixedly mounted on the fixed frame, a second cylinder for pushing the screw connector fixedly mounted on the support frame, two sets of slots symmetrically opened on the lower end of the outer column, the movable frame slidingly connected to the slots, two sets of guide grooves symmetrically opened on the inner column, guide wheels rollingly connected to the guide grooves, grooves provided in the guide grooves, grooves engaging the guide wheels, and several sets of rollers rotatably mounted at equal angles in the discharge box; The inner column descends to approach the mating holes on a set of pipes, and the set of pipes is slowly rotated to automatically align the inner column with the mating holes on the set of pipes. The operation is simple, which can quickly and accurately determine the position of the pipes and improve the welding efficiency of the pipes.

[0009] Preferably, the fixture further includes two sets of rectangular shafts, which are respectively inserted into two sets of guide frames. A second spring is sleeved on one end of the rectangular shaft, and a roller is rotatably installed on the other end of the rectangular shaft. A guide hole is provided on the movable frame, and the rectangular shaft is slidably connected to the guide hole. An annular groove for rolling the roller is provided on the guide wheel. Four sets of trapezoidal blocks for blocking the roller are provided at equal angles in the annular groove. One end of the second spring is fixedly connected to the end of the rectangular shaft, and the other end of the second spring is fixedly connected to the guide frame. When the guide wheel is misaligned with the groove, the roller enters the annular groove. As the inner column moves downward, the guide wheel rolls clockwise along the guide groove. During the rolling process, the roller rolls along the annular groove and is blocked by a set of trapezoidal blocks, preventing the entire guide wheel from rolling clockwise. At this time, the friction between the guide wheel and the guide groove changes from rolling friction to sliding friction, increasing the resistance of the guide wheel to the descent of the inner column, reducing the descent speed of the inner column, and preventing the lower end of the inner column from violently impacting the interface.

[0010] The beneficial effects of this invention are as follows: 1. By coordinating the fixture, feeding platform, and translation mechanism, not only is the T-shaped joint of the two sets of pipes fixed, but the laser welding head can also weld around the joint of the two sets of pipes without making circular motion, thus avoiding excessive dragging of the wire by the laser welding head and preventing interference of the wire to the laser welding head.

[0011] 2. Under the influence of gravity, the lower end of the inner column will directly pass through the docking hole and enter the interior of the pipe until the upper end of the screw connector is blocked by the fixing bracket and cannot move. At this time, the lower end of the inner column is suspended inside the pipe. Then, the other set of pipes is released. Under the influence of gravity, the other set of pipes slides down along the inner column until the lower end of the other set of pipes approaches the docking hole on the first set of pipes. The other set of pipes is slightly rotated so that the lower end of the other set of pipes is completely fitted with the docking hole on the first set of pipes, realizing the docking of the two sets of pipes. Then, the first cylinder drives the fixing sleeve together with the outer column to move downward, so that the lower end of the outer column presses the upper end of the other set of pipes. At the same time, under the rebound force of the first spring, the guide wheel engages the groove, realizing the T-shaped docking of the two sets of pipes. By the inner column descending and approaching the docking hole on the first set of pipes, and slowly rotating the first set of pipes, the inner column automatically docks with the docking hole on the first set of pipes. The operation is simple, so the position of the pipes can be quickly and accurately determined, improving the welding efficiency of the pipes. Attached Figure Description

[0012] The invention will now be further described with reference to the accompanying drawings.

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0014] Figure 2 This is a schematic diagram of the feeding platform of the present invention.

[0015] Figure 3 This is a schematic diagram of the combination of the fixing frame, fixing sleeve, and fixing device of the present invention.

[0016] Figure 4 This is a cross-sectional schematic diagram of the fixator of the present invention.

[0017] Figure 5 for Figure 4 Enlarged diagram of point A in the middle.

[0018] Figure 6 This is a schematic diagram of the material feeding box of the present invention.

[0019] Figure 7 This is a cross-sectional view of the outer column, movable frame, guide wheel, guide frame, rectangular shaft, and second spring assembly of the present invention.

[0020] Figure 8 This is a cross-sectional view of the movable frame, guide wheel, rectangular shaft, second spring, and roller assembly of the present invention.

[0021] In the diagram: 1. Base plate; 2. Feeding platform; 201. Fixed platform; 202. Turntable; 203. Gearbox; 204. Motor; 205. Feeding box; 2051. Roller; 3. Translation mechanism; 4. Fixed arm; 5. Laser welding head; 6. Fixing frame; 601. Through hole; 7. First cylinder; 8. Fixing sleeve; 9. Fixture; 901. Outer column; 9011. Slot; 902. Inner column; 903. Screw-in connector; 9031. Guide groove; 9032. Groove; 904. Movable frame; 9041. Guide hole; 905. Guide wheel; 9051. Annular groove; 9052. Trapezoidal block; 906. Guide post; 907. First spring; 908. Guide frame; 909. Rectangular shaft; 910. Second spring; 911. Roller; 10. Slide rod; 11. Support frame; 12. Second cylinder. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0023] Example 1: As Figures 1 to 2 As shown in the embodiment of the present invention, an alloy steel pipe welding device includes a base plate 1, a feeding platform 2 mounted on the base plate 1, a translation mechanism 3 arranged behind the feeding platform 2, a fixed arm 4 arranged on the translation mechanism 3, a laser welding head 5 fixedly mounted at the end of the fixed arm 4, a fixed frame 6 fixedly mounted on the base plate 1, a first cylinder 7 for driving a fixed sleeve 8 fixedly mounted on the fixed frame 6, a fixture 9 for pressing down the pipe rotatably mounted on the fixed sleeve 8, the feeding platform 2 includes a fixed platform 201 fixedly mounted on the base plate 1, a turntable 202 rotatably mounted on the fixed platform 201, a feeding box 205 for placing the pipe fixedly mounted on the turntable 202, a gearbox 203 mounted at the bottom of the fixed platform 201, and a motor 204 driving the turntable 202 to rotate through the gearbox 203.

[0024] Specifically, the translation mechanism 3 is composed of two existing ball screw structures. The gearbox 203 consists of a housing and two sets of bevel gears meshing together. When T-shaped butt welding of the pipes is required, one set of pipes is first placed into the feeding box 205, and then the other set of pipes is vertically butt-welded with the butt hole on the first set of pipes. At this time, the other set of pipes is located directly below the fixing device 9. The first cylinder 7 is activated, and the first cylinder 7 drives the fixing sleeve 8 to move downward together with the fixing device 9 until the lower end of the fixing device 9 presses against the upper end of the other set of pipes, realizing the T-shaped butt welding of the two sets of pipes. The T-shaped butt joint is fixed, and then the translation mechanism 3 drives the fixed arm 4 and the laser welding head 5 to move, so that the end of the laser welding head 5 is close to the joint of the two sets of pipes. Then the laser welding head 5 welds the joint of the two sets of pipes. At the same time, the motor 204 drives the turntable 202 and the feeding box 205 to rotate together through the gearbox 203. The feeding box 205 drives the fixing device 9 to rotate through the two sets of pipes. With the cooperation of the translation mechanism 3, the laser welding head 5 can move in the longitudinal and vertical directions, so that the laser welding head 5 can weld around the joint of the two sets of pipes, realizing the T-shaped butt welding of the pipes. Compared with the existing technology, by setting up the fixing device 9, the feeding table 2, and the translation mechanism 3, not only is the T-shaped butt joint of the two sets of pipes fixed, but the laser welding head 5 can also weld around the joint of the two sets of pipes without making circular motion, avoiding excessive dragging of the laser welding head 5 on the wire, and thus avoiding interference of the wire on the laser welding head 5.

[0025] Furthermore, two sets of through holes 601 are symmetrically provided on the fixing frame 6. Two sets of slide rods 10 are inserted into the two sets of through holes 601, and the lower ends of the two sets of slide rods 10 are respectively connected to the two ends of the fixing sleeve 8.

[0026] Specifically, during the process of the first cylinder 7 driving the fixing sleeve 8 and the fixing device 9 to move downward together, the fixing sleeve 8 drives the slide rod 10 to slide along the through hole 601, which plays a guiding role in the movement of the fixing device 9.

[0027] like Figures 3 to 6As shown, the fixture 9 includes an outer column 901, a fixing sleeve 8 rotatably mounted on the outer column 901, an inner column 902 movably inserted into the outer column 901, and a screw connector 903 rotatably connected to the upper end of the inner column 902. Two sets of movable frames 904 are symmetrically and movably mounted on the lower end of the outer column 901, guide wheels 905 are rotatably mounted on the movable frames 904, two sets of guide posts 906 are symmetrically mounted on the movable frames 904, and a first spring 907 is sleeved on the guide posts 906. Two sets of guide frames 908 are also symmetrically and movably mounted on the lower end of the outer column 901, with the guide posts 906 inserted into the guide frames 908. On the 08, a support frame 11 is fixedly installed on the fixed frame 6. A second cylinder 12 for pushing the swivel joint 903 is fixedly installed on the support frame 11. Two sets of slots 9011 are symmetrically opened at the lower end of the outer column 901. The movable frame 904 is slidably connected to the slots 9011. Two sets of guide grooves 9031 are symmetrically opened on the inner column 902. The guide wheel 905 is slidably connected to the guide groove 9031. A groove 9032 is provided in the guide groove 9031. The groove 9032 is engaged with the guide wheel 905. Several sets of rollers 2051 are rotatably installed in the material box 205 at equal angles.

[0028] Specifically, when manually connecting two sets of pipes in a T-shape, it is necessary to ensure that the central axis of the fixing device 9 is on the same straight line as the central axis of the other set of pipes. However, the accuracy of manually splicing two sets of pipes is low, and the operator needs to repeatedly adjust and check the relative position of the pipes, which leads to cumbersome operation, low material feeding efficiency, and thus restricts the overall welding efficiency. When performing a T-joint on two sets of pipes, one set of pipes is placed in the feeding box 205, positioned between several sets of rollers 2051. Then, the other set of pipes is fitted onto the lower end of the inner column 902, with the upper end of the other set of pipes close to the lower end of the outer column 901. Next, the second cylinder 12 pushes the swivel joint 903, along with the inner column 902, downward. During this process, the two sets of grooves 9032 on the inner column 902 press against the corresponding guide wheels 905, causing the guide wheels 905 to drive the movable frame 904, along with the two sets of guide columns 906, outward along the slot 9011. The inner column 902 moves laterally, and the movable frame 904 compresses the two sets of first springs 907. When the guide wheel 905 is misaligned with the groove 9032, the upper end of the screw connector 903 disengages from the driving end of the second cylinder 12 and retracts the driving end of the second cylinder 12. Under the action of gravity, the inner column 902 moves downward automatically, and at the same time, the two sets of guide wheels 905 roll along the corresponding guide grooves 9031. Since the axis of the mating hole on one set of pipes is not on the same straight line as the axis of the inner column 902, the lower end of the inner column 902 will be resisted by the mating hole on one set of pipes. The tube is blocked and cannot move further downwards. At this point, the worker uses their other hand to rub a set of tubes. Because the discharge box 205 has rollers 2051, the tube can easily rotate. During the slow rotation of the tube, when the axis of the mating hole on the tube is aligned with the axis of the inner column 902, under the action of gravity, the lower end of the inner column 902 will directly pass through the mating hole and enter the tube until the upper end of the screw connector 903 is blocked by the fixing bracket 6 and cannot move. At this point, the lower end of the inner column 902 is suspended inside the tube. Then, the other set of tubes is released. Under the influence of gravity, another set of pipes slides downwards along the inner column 902 until the lower end of the other set of pipes approaches the mating hole on the first set of pipes. The other set of pipes is slightly rotated so that the lower end of the other set of pipes is fully engaged with the mating hole on the first set of pipes, thus achieving the docking of the two sets of pipes. Then, the first cylinder 7 drives the fixing sleeve 8 and the outer column 901 to move downwards, so that the lower end of the outer column 901 presses against the upper end of the other set of pipes. At the same time, under the rebound force of the first spring 907, the guide wheel 905 engages with the groove 9032, thus achieving the T-shaped docking of the two sets of pipes. By lowering the inner column 902 to approach the mating hole on the first set of pipes and slowly rotating the first set of pipes, the inner column 902 automatically docks with the mating hole on the first set of pipes. The operation is simple, thus enabling quick and accurate determination of the position of the pipes and improving the welding efficiency of the pipes.

[0029] Example 2: Figure 7 and Figure 8As shown in the comparative embodiment one, another embodiment of the present invention is as follows: the fixture 9 further includes two sets of rectangular shafts 909, which are respectively inserted into two sets of guide frames 908. A second spring 910 is sleeved on one end of the rectangular shaft 909, and a roller 911 is rotatably installed on the other end of the rectangular shaft 909. A guide hole 9041 is provided on the movable frame 904, and the rectangular shaft 909 is slidably connected to the guide hole 9041. An annular groove 9051 for rolling connection of the roller 911 is provided on the guide wheel 905. Four sets of trapezoidal blocks 9052 for blocking the roller 911 are provided at equal angles in the annular groove 9051. One end of the second spring 910 is fixedly connected to the end of the rectangular shaft 909, and the other end of the second spring 910 is fixedly connected to the guide frame 908.

[0030] Specifically, the inner column 902 is pushed downward by the second cylinder 12. Under the action of gravity and thrust, the inner column 902 will descend very quickly, causing the lower end of the inner column 902 to hit the interface on a set of pipes, causing a dent at the interface and affecting the insertion of the inner column 902 into the mating hole. Therefore, when the guide wheel 905 is misaligned with the groove, the roller 911 enters the annular groove 9051. When the inner post 902 moves downward, the guide wheel 905 rolls clockwise along the guide groove 9031. During the rolling of the guide wheel 905, the roller 911 rolls along the annular groove 9051, and the roller 911 is blocked by a set of trapezoidal blocks 9052, preventing the entire guide wheel 905 from rolling clockwise. At this time, the friction between the guide wheel 905 and the guide groove 9031 changes from rolling friction to sliding friction, increasing the friction between the guide wheel 905 and the guide groove 9031. 05 provides resistance to the descent of the inner column 902, reducing its descent speed and preventing the lower end of the inner column 902 from violently impacting the interface. Secondly, when the fixed sleeve 8 moves downward, the guide wheel 905 will roll counterclockwise along the guide groove 9031. During the rolling of the roller 911 along the annular groove 9051, the roller 911 will be pushed by the inclined surface on the trapezoidal block, causing the roller 911 to drive the rectangular shaft 909 to move and stretch the second spring 910, so that the roller 911 can roll normally along the annular groove 9051.

[0031] Working principle: First, a set of pipes is placed into the feeding box 205. Then, another set of pipes is vertically connected to the mating hole on the first set of pipes. At this time, the other set of pipes is directly below the fixing device 9. The first cylinder 7 is activated, and the first cylinder 7 drives the fixing sleeve 8 and the fixing device 9 to move downward together until the lower end of the fixing device 9 presses down on the upper end of the other set of pipes, thus fixing the T-shaped joint of the two sets of pipes. Then, the translation mechanism 3 drives the fixing arm 4 and the laser welding head 5 to move, so that the end of the laser welding head 5 is close to the joint of the two sets of pipes. Then, the laser welding head 5 welds the joint of the two sets of pipes. At the same time, the motor 204 drives the turntable 202 and the feeding box 205 to rotate together through the gearbox 203. The feeding box 205 drives the fixing device 9 to rotate through the two sets of pipes. With the cooperation of the translation mechanism 3, the laser welding head 5 can move in the longitudinal and vertical directions, so that the laser welding head 5 welds around the joint of the two sets of pipes, thus realizing the T-shaped joint welding of the pipes. When performing a T-joint on two sets of pipes, one set of pipes is placed in the feeding box 205, positioned between several sets of rollers 2051. Then, the other set of pipes is fitted onto the lower end of the inner column 902, with the upper end of the other set of pipes close to the lower end of the outer column 901. Next, the second cylinder 12 pushes the swivel joint 903, along with the inner column 902, downward. During this process, the two sets of grooves 9032 on the inner column 902 press against the corresponding guide wheels 905, causing the guide wheels 905 to drive the movable frame 904, along with the two sets of guide columns 906, outward along the slot 9011. The inner column 902 moves laterally, and the movable frame 904 compresses the two sets of first springs 907. When the guide wheel 905 is misaligned with the groove 9032, the upper end of the screw connector 903 disengages from the driving end of the second cylinder 12 and retracts the driving end of the second cylinder 12. Under the action of gravity, the inner column 902 moves downward automatically, and at the same time, the two sets of guide wheels 905 roll along the corresponding guide grooves 9031. Since the axis of the mating hole on one set of pipes is not on the same straight line as the axis of the inner column 902, the lower end of the inner column 902 will be resisted by the mating hole on one set of pipes. The tube is blocked and cannot move further downwards. At this point, the worker uses their other hand to rub a set of tubes. Because the discharge box 205 has rollers 2051, the tube can easily rotate. During the slow rotation of the tube, when the axis of the mating hole on the tube is aligned with the axis of the inner column 902, under the action of gravity, the lower end of the inner column 902 will directly pass through the mating hole and enter the tube until the upper end of the screw connector 903 is blocked by the fixing bracket 6 and cannot move. At this point, the lower end of the inner column 902 is suspended inside the tube. Then, the other set of tubes is released. Under the action of gravity, the other set of pipes slides down along the inner column 902 until the lower end of the other set of pipes approaches the docking hole on the first set of pipes. The other set of pipes is slightly rotated so that the lower end of the other set of pipes is completely fitted with the docking hole on the first set of pipes, realizing the docking of the two sets of pipes. Then, the first cylinder 7 drives the fixing sleeve 8 together with the outer column 901 to move downward, so that the lower end of the outer column 901 presses against the upper end of the other set of pipes. At the same time, under the rebound force of the first spring 907, the guide wheel 905 engages with the groove 9032, realizing the T-shaped docking of the two sets of pipes. When the guide wheel 905 is misaligned with the groove, the roller 911 enters the annular groove 9051. As the inner post 902 moves downwards, the guide wheel 905 rolls clockwise along the guide groove 9031. During this rolling process, the roller 911 rolls along the annular groove 9051 and is blocked by a set of trapezoidal blocks 9052, preventing the guide wheel 905 from rolling clockwise. At this point, the friction between the guide wheel 905 and the guide groove 9031 changes from rolling friction to sliding friction, increasing the friction between the guide wheel 905 and the groove. The descent resistance of the inner column 902 reduces its descent speed, preventing the lower end of the inner column 902 from violently impacting the interface. Secondly, when the fixed sleeve 8 moves downward, the guide wheel 905 will roll counterclockwise along the guide groove 9031. During the rolling of the roller 911 along the annular groove 9051, the roller 911 will be pushed by the inclined surface on the trapezoidal block, causing the roller 911 to drive the rectangular shaft 909 to move and stretch the second spring 910, so that the roller 911 can roll normally along the annular groove 9051.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An alloy steel pipe welding device, comprising a base plate (1), characterized in that: A feeding platform (2) is installed on the base plate (1). A translation mechanism (3) is provided behind the feeding platform (2). A fixed arm (4) is provided on the translation mechanism (3). A laser welding head (5) is fixedly installed at the end of the fixed arm (4). A fixed frame (6) is also fixedly installed on the base plate (1). A first cylinder (7) for driving the fixed sleeve (8) is fixedly installed on the fixed frame (6). A fixture (9) for pressing down the pipe is rotatably installed on the fixed sleeve (8). The feeding platform (2) includes a fixed platform (201), which is fixedly installed on the base plate (1); Rotate the turntable (202) mounted on the fixed platform (201); A material feeding box (205) for placing pipes is fixedly installed on the turntable (202); Gearbox (203), said gearbox (203) is mounted on the bottom of said fixed platform (201); The motor (204) drives the turntable (202) to rotate through the gearbox (203).

2. The alloy steel pipe welding device according to claim 1, characterized in that: The fixing frame (6) has two sets of through holes (601) symmetrically opened. The two sets of through holes (601) are connected to two sets of slide rods (10). The lower ends of the two sets of slide rods (10) are respectively connected to the two ends of the fixing sleeve (8).

3. The alloy steel pipe welding device according to claim 2, characterized in that: The fixture (9) includes an outer post (901), and the fixing sleeve (8) is rotatably fitted onto the outer post (901); The inner column (902) is movably connected to the outer column (901); Rotary connection to the upper end of the inner column (902) is made of screw joint (903); Two sets of movable frames (904) are symmetrically and movably installed at the lower end of the outer column (901). Rotate the guide wheel (905) mounted on the movable frame (904); Two sets of guide columns (906) are symmetrically installed on the movable frame (904); A first spring (907) is sleeved on the guide post (906); Two sets of guide frames (908) are symmetrically and movably installed at the lower end of the outer column (901), and the guide column (906) is inserted into the guide frame (908).

4. The alloy steel pipe welding device according to claim 3, characterized in that: A support frame (11) is fixedly installed on the fixed frame (6), and a second cylinder (12) for pushing the swivel joint (903) is fixedly installed on the support frame (11).

5. The alloy steel pipe welding device according to claim 4, characterized in that: The lower end of the outer column (901) is provided with two sets of slots (9011), and the movable frame (904) is slidably connected to the slots (9011).

6. The alloy steel pipe welding device according to claim 5, characterized in that: Two sets of guide grooves (9031) are symmetrically opened on the inner column (902), and the guide wheel (905) is tactilely connected to the guide grooves (9031).

7. The alloy steel pipe welding device according to claim 6, characterized in that: The guide groove (9031) is provided with a groove (9032), the groove (9032) engages with the guide wheel (905), and several sets of rollers (2051) are rotatably installed in the feeding box (205) at equal angles.

8. The alloy steel pipe welding device according to claim 7, characterized in that: The fixture (9) also includes two sets of rectangular shafts (909), which are respectively inserted into two sets of guide frames (908); A second spring (910) is sleeved on one end of the rectangular shaft (909), one end of the second spring (910) is fixedly connected to the end of the rectangular shaft (909), and the other end of the second spring (910) is fixedly connected to the guide frame (908). Rotate the roller (911) mounted on the other end of the rectangular shaft (909).

9. The alloy steel pipe welding device according to claim 8, characterized in that: The movable frame (904) has a guide hole (9041), and the rectangular shaft (909) is slidably connected to the guide hole (9041).

10. The alloy steel pipe welding device according to claim 9, characterized in that: The guide wheel (905) is provided with an annular groove (9051) for rolling connection of the roller (911), and four sets of trapezoidal blocks (9052) for blocking the roller (911) are provided at equal angles in the annular groove (9051).

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