Positioning device for welding metal pipes

Abstract

The application belongs to the technical field of plasma arc positioning welding, in particular to a positioning device for metal pipeline welding, which comprises a working base plate, a moving support frame and a multi-axis welding mechanical arm, the end of the multi-axis welding mechanical arm is fixedly provided with a plasma arc welding head, the welding station comprises a circular arc strip plate and positioning members one and two movably installed on the inner side of the top of the circular arc strip plate, the metal belt in the form of a ring outside the clamping structure is wound, the diameter of the ring is reduced, gradually adheres to the outer side of the curved part of the L-shaped metal pipe, when the metal belt is gradually tightened, the metal belt is inclined and closely adheres to the outer side of the curved part of the L-shaped metal pipe, and the clamping structure abuts against the outer side of the curved part of the L-shaped metal pipe, because the positioning member one and the positioning member two are arranged in the same way, the positioning member one and the positioning member two will exert a cross tension on the curved part of the L-shaped metal pipe, thereby positioning the curved part of the L-shaped metal pipe.

Description

Technical Field

[0001] This invention belongs to the field of plasma arc positioning welding, specifically a positioning device for metal pipe welding. Background Technology

[0002] Metal L-shaped pipes are a common pipe structure widely used in industry, construction, and fluid transportation. An L-shaped pipe consists of two mutually perpendicular pipe sections forming a right angle. In most cases, this right angle is curved. In practical applications, the ends of the two metal L-shaped pipes need to be welded to form a U-shaped pipe. In this process, two cylindrical workpieces are usually clamped and then moved towards each other to connect. A plasma arc welding head is used to weld the two pipes at the connection point to form a U-shaped pipe.

[0003] A patent document with publication number CN111438490B discloses a pipe welding positioning device, which includes multiple connecting brackets and positioning rollers. The upper left and right sides of the connecting brackets have connecting plates extending forward for connecting with the connecting bracket in front. The front ends of the two connecting plates are respectively hinged to the upper part of the connecting bracket in front, and a welding space is formed between the two connecting plates. A locking mechanism is provided between the first and last connecting brackets of the device to realize the connection or separation of the first and last connecting brackets.

[0004] In traditional welding techniques, when welding two L-shaped metal bends, the straight pipes of the L-shaped metal bends are first positioned by clamping them. Then, the two straight pipes of the two L-shaped metal bends to be welded are joined together and welded using a welding head to complete the welding of the two L-shaped metal bends. However, when the straight pipe at the welding position of the L-shaped metal bend is short, clamping this shorter straight pipe for positioning will cover or affect the welding area of ​​this part of the straight pipe. The outside of the straight pipe at the non-welding position of this L-shaped metal bend, i.e., the straight pipe position at the welding position of the metal bend, is not positioned, which can cause the metal pipe to shift during the welding process, thus affecting the subsequent pipe welding.

[0005] Therefore, the present invention provides a positioning device for welding metal pipes. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The positioning device for welding metal pipes according to the present invention includes a working base plate and two movable support frames that are movablely installed on the working base plate. A multi-axis welding robot arm is installed on the side of the working base plate. A plasma arc welding head is fixedly installed at the end of the multi-axis welding robot arm. A motor shaft is installed on the top side of the movable support frame. A welding station is connected and installed on the same side of the movable support frame through the motor shaft. The welding station includes an arc-shaped strip plate and positioning component one and positioning component two movably installed on the inner side of the top of the arc-shaped strip plate. Positioning component one and positioning component two are components made of the same structure, but positioning component one and positioning component two are not at the same horizontal height. The positioning component includes a driving component fixedly installed on the outer side of the top of the arc-shaped strip and a clamping structure movably installed on one side of the driving component. With the driving component, the clamping structure rotates on one side of the driving component and moves toward the center of the arc-shaped strip. A metal strip is wound and installed on one side of the clamping structure. One end of the metal strip is fixedly installed on one side of the clamping structure, and the other end of the metal strip extends through the clamping structure into the interior of the driving component.

[0008] Preferably, an L-shaped arc plate is fixedly installed on the outer side of the arc plate. The arc plate includes a semi-circular ring 1 and a semi-circular ring 2 movably installed at the top. The semi-circular ring 1 and the semi-circular ring 2 are slidably installed between each other. The bottom end of the L-shaped arc plate is fixedly connected to the outer side of the arc plate. The bottom end of the L-shaped arc plate is horizontally lower than the semi-circular ring 2. Multiple telescopic rods 1 are fixedly installed on the side of the L-shaped arc plate. Multiple telescopic rods 1 are connected to the semi-circular ring 1 and the semi-circular ring 2. The semi-circular ring 1 is connected to the positioning component 1, and the semi-circular ring 2 is connected to the positioning component 2.

[0009] Preferably, an arc ring is fixedly installed on the inner wall of the arc strip, and multiple telescopic clamping blocks are movably installed inside the arc ring. The multiple telescopic clamping blocks extend and retract simultaneously to clamp the metal pipe.

[0010] Preferably, a plurality of telescopic rods are fixedly installed at the bottom of the arc-shaped strip, and a lifting plate is fixedly installed at the lower end of the plurality of telescopic rods. A central block is fixedly installed at the center position above the lifting plate, and a plurality of telescopic clamping blocks are fixedly installed on the outside of the central block. The plurality of telescopic clamping blocks are distributed in a ring on the outside of the central block.

[0011] Preferably, the driving component includes an arc-shaped connecting block fixedly installed on the outer side of the semi-arc ring and a component housing fixedly installed on one side of the arc-shaped connecting block. A winding shell is movably installed on the side of the component housing, and the clamping structure is fixedly connected to the winding shell.

[0012] Preferably, the clamping structure includes a clamping ring fixedly installed on one side of the winding shell, and a rubber ring is fixedly installed on the side of the clamping ring facing the metal strip.

[0013] Preferably, the clamping structure has multiple inclined through slots inside, and air nozzles are fixedly installed inside the multiple through slots. The air nozzles are supplied with air by an external air pump.

[0014] Preferably, the outer shell of the component has a structural groove inside, a meshing wheel is movably installed inside the structural groove, a telescopic rod three is fixedly installed on one side of the meshing wheel, and one end of the telescopic rod three is fixedly connected to the winding shell.

[0015] Preferably, a fixed motor is fixedly installed on the outer side of the component housing, and one end of the fixed motor is connected to a drive wheel via a shaft. The drive wheel is located on the component housing and meshes with a meshing wheel.

[0016] Preferably, the inside of the winding shell is provided with a cylindrical groove, and a winding drum is rotatably installed inside the cylindrical groove. One end of the metal strip extends through the clamping ring into the inside of the cylindrical groove and is wound up by the winding drum.

[0017] The beneficial effects of this invention are as follows: 1. The positioning device for welding metal pipes according to the present invention involves winding a ring-shaped metal strip outside the clamping structure. The diameter of the ring decreases, gradually bringing it into contact with the outside of the curved part of the L-shaped metal pipe. As the metal strip is gradually tightened, it is inclined and tightly attached to the outside of the curved part of the L-shaped metal pipe, and the clamping structure abuts against the outside of the curved part of the L-shaped metal pipe. Due to the identical arrangement of positioning component one and positioning component two, positioning component one and positioning component two apply a cross-pulling force to the curved part of the L-shaped metal pipe, thereby positioning the curved part of the L-shaped metal pipe. This avoids the situation where the straight pipe at the welding position at the front end of the curved part of the L-shaped metal pipe is too short, thus preventing the positioning and clamping of the closest position to the welding position.

[0018] 2. The positioning device for welding metal pipes according to the present invention involves extending multiple telescopic clamping blocks one at one end, which then abuts against the outside of the metal pipe to clamp it. Subsequently, retracting multiple telescopic rods two causes the lifting plate to rise, i.e., the lifting plate abuts against the lower end of the metal pipe. By driving the multiple telescopic clamping blocks two, the multiple telescopic clamping blocks two extend, at which point the outer sides of the multiple telescopic clamping blocks two abut against the inner wall of the lower end of the metal pipe, thereby fixing the metal pipe. When the multiple telescopic clamping blocks one retract, they no longer contact the metal pipe. The retraction or lifting of the multiple telescopic rods two causes the curved part of the metal pipe to rise and fall inside the arc plate, so that the curved part of the metal pipe is located inside the metal strip where the corresponding positioning components one and two are set, thus performing preliminary positioning of the curved part of the metal pipe.

[0019] 3. The positioning device for welding metal pipes according to the present invention can supply air to the inside of the air nozzles through an external air pump. The two air nozzles are set at different levels and blow air onto the opposing inner walls on both sides of the metal strip. When the metal strip is unwound, so that the length of the metal strip outside the clamping ring is larger, the blowing of the two inclined air nozzles can make the metal strip outside the clamping ring form a large ring structure. As the metal pipe is placed inside the arc plate, the lifting plate can drive the metal pipe to rise, so that the curved part of the metal pipe is inside the metal strip with a large ring structure. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a three-dimensional view of the entire invention; Figure 2 This is a three-dimensional schematic diagram of the working base plate and the movable support frame in this invention; Figure 3 This is a three-dimensional schematic diagram of the L-shaped arc plate and the circular arc strip plate in this invention; Figure 4 This is a three-dimensional schematic diagram of positioning component one and positioning component two in this invention; Figure 5 This is a three-dimensional schematic diagram of the positioning component in this invention; Figure 6 This is a three-dimensional schematic diagram of the lifting plate in this invention; Figure 7 This is a three-dimensional schematic diagram of the outer shell of the component in this invention; Figure 8 This is a three-dimensional schematic diagram of the winding drum in this invention; Figure 9 This is a frontal view of the metal strip in this invention.

[0022] In the diagram: 1. Working base plate; 13. Multi-axis welding robotic arm; 131. Plasma arc welding head; 2. Moving support frame; 21. Motor shaft; 3. Welding station; 4. L-shaped arc plate; 41. Telescopic rod one; 5. Circular arc plate; 51. Circular arc ring; 52. Telescopic clamping block one; 53. Lifting plate; 531. Center block; 532. Telescopic clamping block two; 54. Telescopic rod two; 55. Semi-arc ring one; 56. Semi-arc ring two; 6. Positioning component one; 6 1. Metal strip; 62. Clamping structure; 621. Clamping ring; 622. Rubber ring; 623. Through groove; 624. Air nozzle; 63. Drive component; 631. Arc-shaped connecting block; 632. Component shell; 6321. Structural groove; 6322. Fixed motor; 6323. Drive wheel; 6324. Meshing wheel; 6325. Telescopic rod three; 633. Rewinding shell; 6331. Rewinding drum; 6332. Cylindrical groove; 7. Positioning component two. Detailed Implementation

[0023] 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.

[0024] Example 1: As Figure 1-4 As shown, a positioning device for welding metal pipes according to an embodiment of the present invention includes a working base plate 1 and two movable support frames 2 that are movably installed above the working base plate 1. A multi-axis welding robotic arm 13 is installed on the side of the working base plate 1. A plasma arc welding head 131 is fixedly installed at the end of the multi-axis welding robotic arm 13. A motor shaft 21 is installed on the top side of the movable support frame 2. A welding station 3 is connected and installed on the same side of the movable support frame 2 through the motor shaft 21. Welding station 3 includes an arc strip plate 5 and positioning component 6 and positioning component 7 movably installed on the inner side of the top of the arc strip plate 5. Positioning component 6 and positioning component 7 are components made of the same structure, but positioning component 6 and positioning component 7 are not at the same horizontal height. The positioning component 6 includes a driving component 63 fixedly installed on the outer side of the top of the arc plate 5 and a clamping structure 62 movably installed on one side of the driving component 63. With the driving component 63, the clamping structure 62 rotates on one side of the driving component 63 and moves toward the center of the arc plate 5. A metal strip 61 is wound and installed on one side of the clamping structure 62. One end of the metal strip 61 is fixedly installed on one side of the clamping structure 62, and the other end of the metal strip 61 extends through the clamping structure 62 into the interior of the driving component 63.

[0025] Specifically, two L-shaped metal tubes are placed on the corresponding welding station 3. At this time, one end of the metal strip 61 is unwound, meaning that more of the metal strip 61 is released from the drive member 63 and the clamping structure 62. The metal strip 61 outside the clamping structure 62 forms a large annular structure. Because the clamping structure 62 and the metal strip 61 can rotate outside the drive member 63 and move towards the center of the arc plate 5, the bent part of the L-shaped metal tube is at the same height as the positioning member 6 and positioning member 7 at the top of the arc plate 5. Inside the annular structure of the metal strip 61, since positioning component 1 6 and positioning component 2 7 are made of the same structure, positioning component 2 7 is also equipped with a metal strip 61. At this time, the bent part of the L-shaped metal tube is located inside the two metal strips 61. The driving clamping structure 62 drives the metal strip 61 to rotate, aligning it with the bent part of the L-shaped metal tube. Subsequently, the driving mechanism causes the clamping structure 62 to move the metal strip 61 toward the bent part of the L-shaped metal tube, while simultaneously causing the metal strip 61 to be wound up. That is, at this time, the annular metal strip 61 located outside the clamping structure 62 is wound up, and the diameter of the annulus decreases, gradually aligning with the L-shaped metal tube. The metal strip 61 is gradually tightened and then adheres tightly to the outside of the bent portion of the L-shaped metal tube. The clamping structure 62 also abuts against the outside of the bent portion. Due to the identical arrangement of positioning components 61 and 7, a cross-pulling force is applied to the bent portion of the L-shaped metal tube, thus positioning it. This prevents the inability to clamp the closest position to the welding location due to the short straight pipe at the front end of the bent portion of the L-shaped metal tube. In traditional techniques, the straight section at the front end of the bent part of the L-shaped metal tube is clamped and positioned to be welded. However, when this straight section is short, the clamping position can easily cover or be close to the welding position, thus affecting the welding effect. After both metal L-shaped tubes are positioned, the two movable support frames 2 and the welding station 3 move towards each other above the working base plate 1, thereby making the welding positions of the two metal L-shaped tubes align. Then, the multi-axis welding robot arm 13 moves to track and adjust the position, and the plasma arc welding head 131 is used to complete the welding of the two metal L-shaped tubes.

[0026] like Figure 3-6As shown, an L-shaped arc plate 4 is fixedly installed on the outer side of the arc plate 5. The arc plate 5 includes a semi-circular ring 55 and a semi-circular ring 56 movably installed at the top. The semi-circular ring 55 and the semi-circular ring 56 are slidably installed between each other. The bottom end of the L-shaped arc plate 4 is fixedly connected to the outer side of the arc plate 5. The bottom end of the L-shaped arc plate 4 is horizontally lower than the semi-circular ring 56. Multiple telescopic rods 41 are fixedly installed on the side of the L-shaped arc plate 4. Multiple corresponding telescopic rods 41 are connected to the semi-circular ring 55 and the semi-circular ring 56. The semi-circular ring 55 is connected to the positioning component 6, and the semi-circular ring 56 is connected to the positioning component 7.

[0027] An arc ring 51 is fixedly installed on the inner wall of the arc strip 5. Multiple telescopic clamping blocks 52 are movably installed inside the arc ring 51. The multiple telescopic clamping blocks 52 extend and retract simultaneously to clamp the metal pipe.

[0028] Multiple telescopic rods 54 are fixedly installed at the bottom of the arc-shaped strip 5. A lifting plate 53 is fixedly installed at the lower end of the multiple telescopic rods 54. A center block 531 is fixedly installed at the center position above the lifting plate 53. Multiple telescopic clamping blocks 532 are fixedly installed on the outside of the center block 531. The multiple telescopic clamping blocks 532 are distributed in a ring on the outside of the center block 531.

[0029] Specifically, the lower end of the L-shaped arc plate 4 is fixedly connected to the arc strip plate 5. Therefore, when the corresponding multiple telescopic rods 41 extend or retract, the corresponding semi-arc rings 55 and 56 will move, thereby changing the horizontal position of the positioning component 6 or the positioning component 7 to adapt to the position of the bent parts of metal pipes of different diameters. When the welding station 3 needs to position the metal pipe, the metal pipe is first placed inside the arc strip plate 5, and the lower end of the metal pipe is above the lifting plate 53. At this time, the center block 531 and multiple telescopic clamping blocks 532 are inside the lower end of the metal pipe. By extending the multiple telescopic clamping blocks 52, one end of the multiple telescopic clamping blocks 52 will abut against the outside of the metal pipe to clamp it. Then, by retracting the multiple telescopic rods 54, the lifting plate 53 rises, that is, the lifting plate 53 abuts against the lower end of the metal pipe. By driving the multiple telescopic clamping blocks 532, the multiple telescopic clamping blocks 532 extend. The outer side of the metal pipe is pressed against the inner wall of the lower end, thus fixing the metal pipe. Multiple telescopic clamping blocks 52 retract and no longer contact the metal pipe. The retraction or lifting of multiple telescopic rods 54 drives the curved part of the metal pipe to rise and fall inside the arc plate 5, so that the curved part of the metal pipe is inside the metal strip 61 set by the corresponding positioning component 6 and positioning component 7, and the curved part of the metal pipe is initially positioned. At this time, the metal strip 61 is unwound into a large ring structure. Then, the curved part of the metal pipe is tightened and positioned by the winding of the metal strip 61, which in turn fixes the bottom position of the metal pipe. By positioning the closest position of the part to be welded, the purpose of better welding is achieved. In this device, the metal strip 61 can contact the outer side of the curved part of the metal pipe over a large area, and it can work for metal pipes of different diameters. Compared with the traditional method of clamping and positioning by telescopic blocks, it can provide a more comprehensive fit and positioning effect.

[0030] like Figure 5 and 7 As shown, the driving component 63 includes an arc-shaped connecting block 631 fixedly installed on the outside of the semi-arc ring 55 and a component housing 632 fixedly installed on one side of the arc-shaped connecting block 631. A winding shell 633 is movably installed on the side of the component housing 632, and the clamping structure 62 is fixedly connected to the winding shell 633.

[0031] The clamping structure 62 includes a clamping ring 621 fixedly installed on one side of the winding shell 633, and a rubber ring 622 fixedly installed on the side of the clamping ring 621 facing the metal strip 61.

[0032] The clamping structure 62 has multiple inclined through slots 623 inside, and air nozzles 624 are fixedly installed inside the multiple through slots 623. The air nozzles 624 are supplied with air by an external air pump.

[0033] Specifically, when the initial requirement is for the bent portion of the metal pipe to be within the large annular structure formed by the metal strip 61, an external air pump can supply air into the nozzle 624. Two nozzles 624 are positioned at different levels and blow air onto the opposing inner walls of the metal strip 61. As the metal strip 61 is unwound, increasing the length of the portion outside the clamping ring 621, the blowing of the two inclined nozzles 624 allows the metal strip 61 outside the clamping ring 621 to form a large annular structure. As the metal pipe is placed inside the arc-shaped plate 5, the lifting plate 53 can raise the metal pipe, causing the bent portion of the metal pipe to be within the large annular structure. Inside the metal strip 61, the clamping ring 621 is moved toward the bending part by electric drive until the rubber ring 622 is squeezed against the outside of the bending part of the metal pipe. At the same time, the winding shell 633 performs winding work, so that one end of the metal strip 61 is wound up. That is, at this time, the length of the metal strip 61 outside the clamping ring 621 becomes smaller, until the metal strip 61 is tightly attached to the outside of the bending part of the metal pipe. The large-area attachment makes the metal pipe evenly stressed, and there will be no damage to the pipe due to clamping and positioning. Moreover, the bidirectional tensioning method of positioning component 1 6 and positioning component 2 7 can balance the torque of the bending part of the pipe and prevent the pipe from deforming or shifting due to uneven stress.

[0034] Example 2: Figure 7-9 As shown in the comparative embodiment one, another embodiment of the present invention is as follows: a structural groove 6321 is provided inside the component shell 632, a meshing wheel 6324 is movably installed inside the structural groove 6321, a telescopic rod 6325 is fixedly installed on one side of the meshing wheel 6324, and one end of the telescopic rod 6325 is fixedly connected to the winding shell 633.

[0035] A fixed motor 6322 is fixedly installed on the outside of the component housing 632. One end of the fixed motor 6322 is connected to a drive wheel 6323 via a shaft. The drive wheel 6323 is located in the component housing 632 and meshes with the meshing wheel 6324.

[0036] The inside of the take-up shell 633 is provided with a cylindrical groove 6332, and a take-up drum 6331 is rotatably installed inside the cylindrical groove 6332. One end of the metal strip 61 extends through the clamping ring 621 into the inside of the cylindrical groove 6332 and is wound up by the take-up drum 6331.

[0037] Specifically, the drive of the fixed motor 6322 drives the drive wheel 6323 and the meshing wheel 6324 to rotate. The rotation of the meshing wheel 6324 drives the rotation of the telescopic rod 6325, the winding shell 633, the clamping structure 62, and the metal strip 61. The inclined metal strip 61 can be wound up on the outside of the curved metal pipe. The telescopic rod 6325 can be electrically extended and retracted, thereby driving the clamping structure 62 to move towards the metal pipe. The winding drum 6331 inside the cylindrical groove 6332 can wind and unwind one end of the metal strip 61, thereby changing the length of the metal strip 61 outside the clamping structure 62.

[0038] Working principle: Two L-shaped metal tubes are placed on the corresponding welding station 3. At this time, one end of the metal strip 61 is unwound, meaning more of the metal strip 61 is released from the drive member 63 and the clamping structure 62. The metal strip 61 outside the clamping structure 62 forms a large annular structure. Because the clamping structure 62 and the metal strip 61 can rotate outside the drive member 63 and move towards the center of the arc plate 5, the bent part of the L-shaped metal tube is at the same height as the positioning member 6 and positioning member 7 at the top of the arc plate 5. Inside the annular structure of the metal strip 61, since the positioning component 6 and the positioning component 7 are made of the same structure, the positioning component 7 also has a metal strip 61. At this time, the bent part of the L-shaped metal tube is located inside the two metal strips 61. The driving clamping structure 62 drives the metal strip 61 to rotate, aligning it with the bent part of the L-shaped metal tube. Then, the driving clamping structure 62 drives the metal strip 61 to move towards the bent part of the L-shaped metal tube, while the metal strip 61 is wound up. That is, at this time, the annular metal strip 61 located outside the clamping structure 62 is wound up, and the diameter of the annulus becomes smaller, gradually aligning with the L-shaped... The metal strip 61 is gradually tightened and then pressed against the outside of the bent portion of the L-shaped metal tube. The clamping structure 62 also abuts against the outside of the bent portion. Due to the identical arrangement of positioning components 61 and 7, a cross-pulling force is applied to the bent portion of the L-shaped metal tube, thus positioning it. This prevents the inability to clamp the closest point to the welding position due to the short straight section at the front end of the bent portion of the L-shaped metal tube. In traditional techniques, the straight section at the front end of the bent part of the L-shaped metal tube is clamped and positioned to be welded. However, when this straight section is short, the clamping position can easily cover or be close to the welding position, thus affecting the welding effect. After both metal L-shaped tubes are positioned, the two movable support frames 2 and the welding station 3 move towards each other above the working base plate 1, thereby making the welding positions of the two metal L-shaped tubes align. Then, the multi-axis welding robot arm 13 moves to track and adjust the position, and the plasma arc welding head 131 is used to complete the welding of the two metal L-shaped tubes.The lower end of the L-shaped arc plate 4 is fixedly connected to the arc strip plate 5. Therefore, when the corresponding multiple telescopic rods 1 41 extend or retract, the corresponding semi-arc rings 1 55 and 2 56 will move, thereby changing the horizontal position of the positioning component 1 6 or positioning component 2 7 to adapt to the position of the bent parts of metal pipes of different diameters. When the welding station 3 needs to position the metal pipe, the metal pipe is first placed inside the arc strip plate 5, and the lower end of the metal pipe is above the lifting plate 53. At this time, the center block 531 and multiple telescopic clamping blocks 2 532 are inside the lower end of the metal pipe. By extending the multiple telescopic clamping blocks 1 52, one end of the multiple telescopic clamping blocks 1 52 will abut against the outside of the metal pipe to clamp it. Then, by retracting the multiple telescopic rods 2 54, the lifting plate 53 rises, that is, the lifting plate 53 abuts against the lower end of the metal pipe. By driving the multiple telescopic clamping blocks 2 532, the multiple telescopic clamping blocks 2 532 extend. At this time, the multiple telescopic rods 1 54 extend. The outer side of clamping block 532 abuts against the lower inner wall of the metal pipe, thus fixing the metal pipe. Multiple telescopic clamping blocks 52 retract and no longer contact the metal pipe. The retraction or lifting of multiple telescopic rods 54 causes the bent part of the metal pipe to rise and fall inside the arc plate 5, so that the bent part of the metal pipe is inside the metal strip 61 set by the corresponding positioning component 6 and positioning component 7. At this time, the metal strip 61 is unwound into a large ring structure. Then, the winding of the metal strip 61 tightens and positions the bent part of the metal pipe, thus fixing the bottom position of the metal pipe. By positioning the closest position of the part to be welded, a better welding purpose is achieved. In this device, the metal strip 61 can contact the outer side of the bent part of the metal pipe over a large area, and it can work for metal pipes of different diameters. Compared with the traditional method of clamping and positioning by telescopic blocks, it can provide a more comprehensive fit and positioning effect.

[0039] 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. A positioning device for welding metal pipes, comprising a working base plate (1) and two movable support frames (2) mounted on the working base plate (1), wherein a multi-axis welding robotic arm (13) is mounted on the side of the working base plate (1), and a plasma arc welding head (131) is fixedly mounted at the end of the multi-axis welding robotic arm (13), characterized in that: A motor shaft (21) is installed on the top side of the mobile support frame (2), and a welding station (3) is connected and installed on the same side of the mobile support frame (2) through the motor shaft (21). The welding station (3) includes an arc plate (5) and positioning component one (6) and positioning component two (7) movably installed on the inner side of the top of the arc plate (5). The positioning component one (6) and positioning component two (7) are components made of the same structure, and the positioning component one (6) and positioning component two (7) are not at the same horizontal height. The positioning component (6) includes a driving component (63) fixedly installed on the outer side of the top of the arc plate (5) and a clamping structure (62) movably installed on one side of the driving component (63). With the driving component (63) in place, the clamping structure (62) rotates on one side of the driving component (63) and moves toward the center of the arc plate (5). A metal strip (61) is wound up and installed on one side of the clamping structure (62). One end of the metal strip (61) is fixedly installed on one side of the clamping structure (62), and the other end of the metal strip (61) extends through the clamping structure (62) into the interior of the driving component (63). As the metal strip (61) in a ring shape outside the clamping structure (62) is wound up, the diameter of the ring becomes smaller and gradually fits against the outside of the curved part of the L-shaped metal tube. After the metal strip (61) is gradually tightened, the metal strip (61) is tilted and tightly fitted against the outside of the curved part of the L-shaped metal tube.

2. The positioning device for welding metal pipes according to claim 1, characterized in that: An L-shaped arc plate (4) is fixedly installed on the outer side of the arc plate (5). The arc plate (5) includes a semi-arc ring one (55) and a semi-arc ring two (56) movably installed at the top. The semi-arc ring one (55) and the semi-arc ring two (56) are slidably installed between each other. The bottom end of the L-shaped arc plate (4) is fixedly connected to the outer side of the arc plate (5). The bottom end of the L-shaped arc plate (4) is horizontally lower than the semi-arc ring two (56). Multiple telescopic rods one (41) are fixedly installed on the side of the L-shaped arc plate (4). Multiple telescopic rods one (41) are connected to the semi-arc ring one (55). Multiple telescopic rods one (41) are connected to the semi-arc ring two (56). The semi-arc ring one (55) is connected to the positioning component one (6). The semi-arc ring two (56) is connected to the positioning component two (7).

3. A positioning device for welding metal pipes according to claim 2, characterized in that: An arc ring (51) is fixedly installed on the inner wall of the arc strip (5). Multiple telescopic clamping blocks (52) are movably installed inside the arc ring (51). The multiple telescopic clamping blocks (52) simultaneously extend and retract to clamp the metal pipe.

4. A positioning device for welding metal pipes according to claim 3, characterized in that: Multiple telescopic rods (54) are fixedly installed at the bottom of the arc-shaped strip (5). A lifting plate (53) is fixedly installed at the lower end of the multiple telescopic rods (54). A center block (531) is fixedly installed at the center position above the lifting plate (53). Multiple telescopic clamping blocks (532) are fixedly installed on the outside of the center block (531). The multiple telescopic clamping blocks (532) are distributed in a ring on the outside of the center block (531).

5. A positioning device for welding metal pipes according to claim 2, characterized in that: The driving component (63) includes an arc-shaped connecting block (631) fixedly installed on the outside of the semi-arc ring (55) and a component shell (632) fixedly installed on one side of the arc-shaped connecting block (631). A winding shell (633) is movably installed on the side of the component shell (632), and the clamping structure (62) is fixedly connected to the winding shell (633).

6. A positioning device for welding metal pipes according to claim 5, characterized in that: The clamping structure (62) includes a clamping ring (621) fixedly installed on one side of the winding shell (633), and a rubber ring (622) is fixedly installed on the side of the clamping ring (621) facing the metal strip (61).

7. A positioning device for welding metal pipes according to claim 6, characterized in that: The clamping structure (62) has multiple inclined through slots (623) inside, and air nozzles (624) are fixedly installed inside the multiple through slots (623). The air nozzles (624) are supplied with air by an external air pump.

8. A positioning device for welding metal pipes according to claim 5, characterized in that: The outer shell (632) of the component has a structural groove (6321) inside. A meshing wheel (6324) is movably installed inside the structural groove (6321). A telescopic rod (6325) is fixedly installed on one side of the meshing wheel (6324). One end of the telescopic rod (6325) is fixedly connected to the winding shell (633).

9. A positioning device for welding metal pipes according to claim 8, characterized in that: A fixed motor (6322) is fixedly installed on the outside of the component housing (632). One end of the fixed motor (6322) is connected to a drive wheel (6323) via a shaft. The drive wheel (6323) is located inside the component housing (632) and meshes with a meshing wheel (6324).

10. A positioning device for welding metal pipes according to claim 5, characterized in that: The inside of the take-up shell (633) is provided with a cylindrical groove (6332), and a take-up drum (6331) is rotatably installed inside the cylindrical groove (6332). One end of the metal strip (61) extends through the clamping ring (621) into the inside of the cylindrical groove (6332) and is wound up by the take-up drum (6331).

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