Positioning device for metal pipeline welding

Abstract

The invention belongs to the technical field of plasma arc positioning welding, and particularly relates to a metal pipeline welding positioning device which comprises a working bottom plate, a movable supporting frame and a multi-axis welding mechanical arm. The welding station comprises an arc strip plate, a first positioning component and a second positioning component, the first positioning component and the second positioning component are movably mounted on the inner side of the top of the arc strip plate, the annular metal belt located on the outer side of the clamping structure is wound, the annular diameter is decreased, and the annular metal belt is gradually attached to the outer side of the bent portion of the L-shaped metal pipe; the metal belt is tightly attached to the outer side of the bent portion of the L-shaped metal pipe in an inclined mode, the clamping structure abuts against the outer side of the bent portion of the L-shaped metal pipe, and due to the fact that the first positioning component and the second positioning component are arranged in the same mode, the first positioning component and the second positioning component can exert crossed pulling force on the bent portion of the L-shaped metal pipe; and further, the bent part of the L-shaped metal pipe is positioned.

Description

Technical Field

[0001] The invention belongs to the field of plasma arc positioning welding, in particular to a positioning device for metal pipeline welding. Background Art

[0002] Metal L-shaped pipes are a common form of pipe structure, widely used in industries such as industry, construction, and fluid transportation. L-shaped pipes are composed of two mutually perpendicular pipe sections, forming a right angle. In most cases, this right angle is set in a curved shape. In actual use, 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 first and then moved toward each other for docking. The two pipe docking positions are welded using a plasma arc welding joint to form a U-shaped pipe.

[0003] A patent document with publication number CN111438490B discloses a pipeline welding positioning device, which includes multiple connecting brackets and positioning rollers. The left and right sides of the upper part of the connecting bracket respectively extend forward with connecting plate parts for connecting to the connecting bracket in front, and the front ends of the two connecting plate parts are respectively hinged to the upper part of the connecting bracket in front, forming a welding space between the two connecting plate parts; a locking mechanism is provided between the head and tail connecting brackets of the device for realizing the connection or separation of the head and tail connecting brackets.

[0004] In traditional technology, when welding two L-shaped metal bends, the straight pipe of the L-shaped metal bend is first positioned by clamping it, and then the two straight pipes of the L-shaped metal bend to be welded are connected, and welding is performed through the 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 shorter, if the positioning is performed by clamping this shorter straight pipe, the welding part of this straight pipe will be covered or affected. Clamping the outer side of the straight pipe at the non-welding position of the L-shaped metal bend, that is, the straight pipe position at the welding position of the metal bend is not positioned, which will cause the metal pipe to shift during the welding process, thereby affecting the subsequent pipeline welding.

[0005] To this end, the present invention provides a positioning device for metal pipe welding. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is as follows: a positioning device for metal pipe welding according to the present invention comprises a working base plate and two movable support frames movably mounted above the working base plate, a multi-axis welding robot arm is mounted on the side of the working base plate, a plasma arc welding head is fixedly mounted on the end of the multi-axis welding robot arm, a motor shaft is mounted on the top side of the movable support frame, and a welding station is mounted on the same side of the movable support frame via the motor shaft; The welding station includes an arc strip plate and a first positioning member and a second positioning member movably mounted on the inner side of the top of the arc strip plate. The first positioning member and the second positioning member are components made of the same structure, and the first positioning member and the second positioning member are not at the same horizontal height. The positioning component includes a driving component fixedly installed on the outside of the top end of the arc strip and a clamping structure movably installed on one side of the driving component. Through the setting of the driving component, the clamping structure rotates on one side of the driving component and moves toward the center position of the arc strip. A metal belt is wound and installed on one side of the clamping structure. One end of the metal belt is fixedly installed on one side of the clamping structure, and the other end of the metal belt passes through the clamping structure and extends to the interior of the driving component.

[0008] Preferably, an L-shaped arc plate is fixedly installed on the outer side of the arc strip plate, and the arc strip plate includes a semi-arc ring 1 and a semi-arc ring 2 movably installed at the top, and the semi-arc ring 1 and the semi-arc ring 2 are slidably installed therebetween, and the bottom end of the L-shaped arc plate is fixedly connected to the outer side of the arc strip plate, and the horizontal height of the bottom end of the L-shaped arc plate is lower than that of the semi-arc ring 2. A plurality of telescopic rods 1 are fixedly installed on the side of the L-shaped arc plate, and a plurality of corresponding telescopic rods 1 are connected to the semi-arc ring 1, and a plurality of corresponding telescopic rods 1 are connected to the semi-arc ring 2, the semi-arc ring 1 is connected to the positioning component 1, and the semi-arc 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 a plurality of telescopic clamping blocks are movably installed inside the arc ring. The plurality of telescopic clamping blocks are simultaneously telescoped to clamp the metal pipe.

[0010] Preferably, a plurality of telescopic rods 2 are fixedly installed on the bottom of the arc strip plate, a lifting plate is fixedly installed on the lower ends of the plurality of telescopic rods 2, a center block is fixedly installed at the center position above the lifting plate, a plurality of telescopic clamping blocks 2 are fixedly installed on the outside of the center block, and the plurality of telescopic clamping blocks 2 are distributed in a ring on the outside of the center block.

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

[0012] Preferably, the clamping structure comprises a clamping ring fixedly mounted on one side of the winding shell, and a rubber ring is fixedly mounted on the side of the clamping ring facing the metal belt.

[0013] Preferably, a plurality of inclined through-grooves are provided inside the clamping structure, and air nozzles are fixedly installed inside the plurality of through-grooves, and air is supplied to the air nozzles by an external air pump.

[0014] Preferably, a structural groove is provided inside the component shell, 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 mounted on the outer side of the component housing, one end of the fixed motor is connected to a driving wheel via a shaft, and the driving wheel is located in the component housing and meshes with the meshing wheel.

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

[0017] The beneficial effects of the present invention are as follows: 1. The positioning device for metal pipe welding described in the present invention is a device in which a ring-shaped metal belt on the outside of the clamping structure is rolled up, and the diameter of the ring becomes smaller, gradually fitting with the outside of the bending part of the L-shaped metal pipe. When the metal belt is gradually tightened, the metal belt is tilted and tightly fitted to the outside of the bending part of the L-shaped metal pipe, and the clamping structure is against the outside of the bending part of the L-shaped metal pipe. Due to the same setting of the positioning component one and the positioning component two, the positioning component one and the positioning component two will apply a cross tension to the bending part of the L-shaped metal pipe, thereby positioning the bending part of the L-shaped metal pipe, avoiding the situation where the straight pipe at the front end of the bending part of the L-shaped metal pipe to be welded is too short, and thus the position closest to the welding position to be welded cannot be positioned and clamped.

[0018] 2. A positioning device for metal pipe welding described in the present invention, by extending a plurality of telescopic clamping blocks 1, one end of the plurality of telescopic clamping blocks 1 will abut against the outside of the metal pipe to clamp it, and then by contracting a plurality of telescopic rods 2, the lifting plate is raised, that is, the lifting plate abuts against the lower end of the metal pipe, and by driving the plurality of telescopic clamping blocks 2, the plurality of telescopic clamping blocks 2 are extended. At this time, the outer sides of the plurality of telescopic clamping blocks 2 abut against the inner wall of the lower end of the metal pipe, thereby fixing the metal pipe, and the plurality of telescopic clamping blocks 1 are contracted and no longer contact the metal pipe. The contraction or lifting of the plurality of telescopic rods 2 drives the bent part of the metal pipe to rise and fall inside the arc strip plate, so that the bent part of the metal pipe is inside the metal belt set by the corresponding positioning component 1 and positioning component 2, and the bent part of the metal pipe is preliminarily positioned.

[0019] 3. The positioning device for metal pipe welding described in the present invention can supply air to the inside of the air nozzle through an external air pump. The two air nozzles are arranged at different levels and blow air toward the opposite inner walls on both sides of the metal strip. When the metal strip is unwound, the length of the metal strip portion outside the clamping ring is increased. 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 strip plate, the lifting plate can drive the metal pipe to rise, so that the curved portion of the metal pipe is inside the metal strip with a large ring structure. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 1 It is an overall stereogram of the present invention; Figure 2 It is a three-dimensional schematic diagram of the working base plate and the movable support frame in the present invention; Figure 3 This is a three-dimensional schematic diagram of the L-shaped arc plate and the circular arc strip plate in the present invention; Figure 4 It is a three-dimensional schematic diagram of the positioning member 1 and the positioning member 2 in the present invention; Figure 5 It is a three-dimensional schematic diagram of the positioning component in the present invention; Figure 6 It is a three-dimensional schematic diagram of the lifting plate in the present invention; Figure 7 It is a three-dimensional schematic diagram of the component shell in the present invention; Figure 8 It is a three-dimensional schematic diagram of the winding drum in the present invention; Figure 9 It is a front plan view schematic diagram of the metal belt in the present invention.

[0022] In the figure: 1, working base plate; 13, multi-axis welding robot arm; 131, plasma arc welding joint; 2, mobile support frame; 21, motor shaft; 3, welding station; 4, L-shaped arc plate; 41, telescopic rod 1; 5, circular arc strip plate; 51, circular arc ring; 52, telescopic clamping block 1; 53, lifting plate; 531, center block; 532, telescopic clamping block 2; 54, telescopic rod 2; 55, semi-arc ring 1; 56, semi-arc ring 2; 6, positioning member 1; 6 1. Metal belt; 62. Clamping structure; 621. Clamping ring; 622. Rubber ring; 623. Through-groove; 624. Air nozzle; 63. Driving component; 631. Arc-shaped connecting block; 632. Component housing; 6321. Structural groove; 6322. Fixed motor; 6323. Driving wheel; 6324. Engaging wheel; 6325. Telescopic rod three; 633. Winding shell; 6331. Winding drum; 6332. Cylindrical groove; 7. Positioning component two. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0024] Example 1: Figure 1-4 As shown, a positioning device for metal pipe welding according to an embodiment of the present invention includes a working base plate 1 and two mobile support frames 2 movably mounted above the working base plate 1. A multi-axis welding robot arm 13 is mounted on the side of the working base plate 1. A plasma arc welding head 131 is fixedly mounted on the end of the multi-axis welding robot arm 13. A motor shaft 21 is mounted on the top side of the mobile support frame 2. A welding station 3 is mounted on the same side of the mobile support frame 2 via the motor shaft 21. The welding station 3 includes an arc strip plate 5 and a positioning member 1 6 and a positioning member 2 7 movably mounted on the inner side of the top of the arc strip plate 5. The positioning member 1 6 and the positioning member 2 7 are components made of the same structure, but the positioning member 1 6 and the positioning member 2 7 are not at the same horizontal height; The positioning member 6 includes a driving member 63 fixedly mounted on the outside of the top end of the arc strip 5 and a clamping structure 62 movably mounted on one side of the driving member 63. Through the setting of the driving member 63, the clamping structure 62 rotates on one side of the driving member 63 and moves toward the center position of the arc strip 5. A metal belt 61 is wound and installed on one side of the clamping structure 62. One end of the metal belt 61 is fixedly mounted on one side of the clamping structure 62, and the other end of the metal belt 61 passes through the clamping structure 62 and extends to the inside of the driving member 63.

[0025] Specifically, two L-shaped metal tubes are placed on the corresponding welding stations 3. At this time, one end of the metal belt 61 is unwound, that is, more parts of the metal belt 61 are released from the driving member 63 and the clamping structure 62. At this time, the metal belt 61 outside the clamping structure 62 is a large ring structure as a whole. Because the clamping structure 62 and the metal belt 61 can rotate outside the driving member 63 and move toward the center of the arc strip 5, the bending part of the L-shaped metal tube is at the same height as the positioning member 1 6 and the positioning member 2 7 set at the top of the arc strip 5, and the bending part of the L-shaped metal tube is at the metal strip 63. The metal belt 61 is inside the annular structure. Since the positioning member 1 6 and the positioning member 2 7 are components made of the same structure, the positioning member 2 7 is also provided with a metal belt 61. At this time, the bending part of the L-shaped metal tube is inside the two metal belts 61. The driving clamping structure 62 drives the metal belt 61 to rotate so that it is aligned with the bending part of the L-shaped metal tube. Then, the driving clamping structure 62 drives the metal belt 61 to move toward the bending part of the L-shaped metal tube, and at the same time, the metal belt 61 is wound. That is, the ring-shaped metal belt 61 outside the clamping structure 62 is wound, and the diameter of the ring becomes smaller, gradually aligning with the L-shaped metal tube. The outer side of the bending part of the L-shaped metal tube is fitted. When the metal belt 61 is gradually tightened, the metal belt 61 is tilted and tightly fitted to the outer side of the bending part of the L-shaped metal tube, and the clamping structure 62 is against the outer side of the bending part of the L-shaped metal tube. Due to the same setting of the positioning member 1 6 and the positioning member 2 7, the positioning member 1 6 and the positioning member 2 7 will apply a cross tension to the bending part of the L-shaped metal tube, thereby positioning the bending part of the L-shaped metal tube, avoiding the problem that the straight pipe at the front end of the bending part of the L-shaped metal tube to be welded is short, and thus the positioning clamp cannot be performed at the position closest to the welding position to be welded. In the conventional technology, the straight tube at the front end of the bending part of the L-shaped metal tube where welding is required is generally clamped and positioned. However, when the straight tube position is short, the clamping position is easy to cover or be close to the position where welding is required, thus affecting the welding effect. After the two metal L-shaped tubes are positioned, the two movable support frames 2 and the welding station 3 are moved toward each other above the working base plate 1, so that the two metal L-shaped tubes are docked at the positions where welding is required. Then, the multi-axis moving multi-axis welding robot 13 is used 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 strip 5. The arc strip 5 includes a semi-arc ring 1 55 and a semi-arc ring 2 56 movably installed at the top. The semi-arc ring 1 55 and the semi-arc ring 2 56 are slidably installed therebetween. The bottom end of the L-shaped arc plate 4 is fixedly connected to the outer side of the arc strip 5. The horizontal height of the bottom end of the L-shaped arc plate 4 is lower than that of the semi-arc ring 2 56. A plurality of telescopic rods 1 41 are fixedly installed on the side of the L-shaped arc plate 4. A plurality of corresponding telescopic rods 1 41 are connected to the semi-arc ring 1 55. A plurality of corresponding telescopic rods 1 41 are connected to the semi-arc ring 2 56. The semi-arc ring 1 55 is connected to the positioning component 1 6. The semi-arc ring 2 56 is connected to the positioning component 2 7.

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

[0028] A plurality of telescopic rods 54 are fixedly installed at the bottom of the arc strip 5, a lifting plate 53 is fixedly installed at the lower end of the plurality of telescopic rods 54, a center block 531 is fixedly installed at the center position above the lifting plate 53, and a plurality of telescopic clamping blocks 532 are fixedly installed on the outer side of the center block 531, and the plurality of telescopic clamping blocks 532 are distributed in a ring on the outer side of the center block 531.

[0029] Specifically, the lower end of the L-shaped arc plate 4 is fixedly connected to the circular arc strip plate 5. Therefore, when the corresponding multiple telescopic rods 1 41 are extended and retracted, the corresponding semi-arc ring 1 55 and semi-arc ring 2 56 will move, thereby changing the horizontal position of the positioning member 1 6 or the positioning member 2 7 to adapt to the position of the bending part of the metal pipe of different diameters. When the welding station 3 needs to position the metal pipe, the metal pipe is first placed inside the circular 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 the multiple telescopic clamping blocks 2 532 are inside the lower end of the metal pipe. Through the extension of 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. Subsequently, through the contraction of the multiple telescopic rods 2 54, the lifting plate 53 is raised, 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 are extended. At this time, the multiple telescopic clamping blocks 2 532 The outer side of the metal pipe is against the inner wall of the lower end of the metal pipe, thereby fixing the metal pipe. The multiple telescopic clamping blocks 52 are retracted and no longer contact the metal pipe. The contraction or lifting of the multiple telescopic rods 54 drives the bent part of the metal pipe to rise and fall inside the arc strip plate 5, so that the bent part of the metal pipe is inside the metal belt 61 provided with the corresponding positioning member 1 6 and positioning member 2 7, and the bent part of the metal pipe is preliminarily positioned. At this time, the metal belt 61 is unwound to form a large ring structure, and then the bent part of the metal pipe is tightened and positioned by rewinding the metal belt 61, thereby coordinating the fixation of the bottom position of the metal pipe and positioning the nearest position of the part to be welded to achieve the purpose of better welding. In this device, the metal belt 61 can contact the outer side of the bent part of the metal pipe over a large area, and can be effective for metal pipes of different diameters. Compared with the traditional technology of clamping and positioning by telescopic blocks, a more comprehensive fit can be provided to provide a positioning effect.

[0030] like Figure 5 and 7 As shown, the driving component 63 includes an arc-shaped connecting block 631 fixedly mounted on the outside of the semi-arc ring 55 and a component shell 632 fixedly mounted on one side of the arc-shaped connecting block 631. A winding shell 633 is movably mounted on the side of the component shell 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 mounted on one side of the winding shell 633 , and a rubber ring 622 is fixedly mounted on the side of the clamping ring 621 facing the metal belt 61 .

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

[0033] Specifically, when it is initially required that the bent portion of the metal pipe be within a large annular structure formed by the metal belt 61, air can be supplied to the inside of the air nozzle 624 through an external air pump. The two air nozzles 624 are set at different levels and blow toward the opposite inner walls on both sides of the metal belt 61. When the metal belt 61 is unwound, the longer the portion of the metal belt 61 outside the clamping ring 621 is, the blowing of the two inclined air nozzles 624 can allow the metal belt 61 outside the clamping ring 621 to form a large annular structure. As the metal pipe is placed inside the arc strip plate 5, the lifting plate 53 can drive the metal pipe to rise, so that the bent portion of the metal pipe is in a large annular structure. The inside of the metal belt 61 is electrically driven to move the clamping ring 621 toward the bending part 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 the winding operation, so that one end of the metal belt 61 is wound, that is, the length of the metal belt 61 outside the clamping ring 621 is reduced until the metal belt 61 is fitted and tightened on the outside of the bending part of the metal pipe. The large-area fitting makes the metal pipe evenly stressed, and there will be no damage to the pipe due to clamping and positioning. In addition, the two-way tensioning method of the positioning member 1 6 and the positioning member 2 7 can balance the torque of the pipe bending part to prevent the pipe from being deformed or shifted due to uneven force.

[0034] Example 2: Figure 7-9 As shown, compared with Example 1, another embodiment of the present invention is: a structural groove 6321 is opened inside the component shell 632, and a meshing wheel 6324 is movably installed inside the structural groove 6321. A telescopic rod three 6325 is fixedly installed on one side of the meshing wheel 6324, and one end of the telescopic rod three 6325 is fixedly connected to the winding shell 633.

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

[0036] A cylindrical groove 6332 is defined inside the winding shell 633 , and a winding drum 6331 is rotatably installed inside the cylindrical groove 6332 . One end of the metal belt 61 passes through the clamping ring 621 and extends into the cylindrical groove 6332 and is wound by the winding drum 6331 .

[0037] Specifically, the driving wheel 6323 and the meshing wheel 6324 engaged with it are driven by the fixed motor 6322 to rotate, and the rotation of the meshing wheel 6324 drives the rotation of the telescopic rod three 6325, the winding shell 633, the clamping structure 62 and the metal belt 61. The inclined metal belt 61 can be wound on the outer side of the bend of the metal pipe, and the telescopic rod three 6325 can be electrically extended and retracted, thereby driving the clamping structure 62 to move toward the metal pipe. The winding drum 6331 inside the cylindrical groove 6332 can reel in and out one end of the metal belt 61, thereby changing the length of the metal belt 61 outside the clamping structure 62.

[0038] Working principle: Place two L-shaped metal tubes on the corresponding welding station 3. At this time, one end of the metal belt 61 is unwound, that is, more parts of the metal belt 61 are released from the driving member 63 and the clamping structure 62. At this time, the metal belt 61 outside the clamping structure 62 is a large ring structure as a whole. Because the clamping structure 62 and the metal belt 61 can rotate outside the driving member 63 and move toward the center of the arc strip 5, the bending part of the L-shaped metal tube is at the same height as the positioning member 1 6 and the positioning member 2 7 set at the top of the arc strip 5, and the bending part of the L-shaped metal tube is at Inside the annular structure of the metal belt 61, since the positioning member 1 6 and the positioning member 2 7 are components made of the same structure, the positioning member 2 7 is also provided with a metal belt 61. At this time, the bending part of the L-shaped metal tube is inside the two metal belts 61. The driving clamping structure 62 drives the metal belt 61 to rotate so that it is aligned with the bending part of the L-shaped metal tube. Then, the driving clamping structure 62 drives the metal belt 61 to move toward the bending part of the L-shaped metal tube, and at the same time, the metal belt 61 is wound, that is, the annular metal belt 61 on the outside of the clamping structure 62 is wound, and the diameter of the ring becomes smaller, gradually aligning with the L-shaped metal tube. The outer side of the bending part of the metal tube is fitted. When the metal belt 61 is gradually tightened, the metal belt 61 is tilted and tightly fitted to the outer side of the bending part of the L-shaped metal tube, and the clamping structure 62 is against the outer side of the bending part of the L-shaped metal tube. Due to the same setting of the positioning member 1 6 and the positioning member 2 7, the positioning member 1 6 and the positioning member 2 7 will apply a cross tension to the bending part of the L-shaped metal tube, thereby positioning the bending part of the L-shaped metal tube, avoiding the problem that the straight pipe at the front end of the bending part of the L-shaped metal tube to be welded is shorter, and thus the positioning clamp cannot be performed at the position closest to the welding position. In the conventional technology, the straight tube at the front end of the bending part of the L-shaped metal tube where welding is required is generally clamped and positioned. However, when the straight tube position is short, the clamping position is easy to cover or be close to the position where welding is required, thus affecting the welding effect. After the two metal L-shaped tubes are positioned, the two movable support frames 2 and the welding station 3 are moved toward each other above the working base plate 1, so that the two metal L-shaped tubes are docked at the positions where welding is required. Then, the multi-axis moving multi-axis welding robot 13 is used 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 circular arc strip plate 5. Therefore, when the corresponding multiple telescopic rods 1 41 are extended and retracted, the corresponding semi-arc ring 1 55 and semi-arc ring 2 56 will move, thereby changing the horizontal position of the positioning component 1 6 or the positioning component 2 7 to adapt to the position of the bending part of the metal pipe with different diameters. When the welding station 3 is needed to position the metal pipe, the metal pipe is first placed inside the circular 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 the multiple telescopic clamping blocks 2 532 are inside the lower end of the metal pipe. Through the extension of 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. Subsequently, through the contraction of the multiple telescopic rods 2 54, the lifting plate 53 is raised, 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 are extended. At this time, the multiple telescopic The outer side of the clamping block 2 532 is against the inner wall of the lower end of the metal pipe, thereby fixing the metal pipe. The multiple telescopic clamping blocks 1 52 shrink and no longer contact the metal pipe. The contraction or lifting of the multiple telescopic rods 2 54 drives the bent part of the metal pipe to rise and fall inside the arc strip 5, so that the bent part of the metal pipe is inside the metal belt 61 set by the corresponding positioning component 1 6 and positioning component 2 7. At this time, the metal belt 61 is unwound to form a large ring structure, and then the bent part of the metal pipe is tightened and positioned by the winding of the metal belt 61, thereby cooperating with the fixation of the bottom position of the metal pipe and positioning the nearest position of the part to be welded to achieve the purpose of better welding. The metal belt 61 in this device can contact the outer side of the bent part of the metal pipe over a large area, and can be effective for metal pipes of different diameters. Compared with the traditional technology of clamping and positioning by telescopic blocks, it can provide a more comprehensive fit and positioning effect.

[0039] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A positioning device for metal pipe welding, comprising a working base plate (1) and two movable support frames (2) movably mounted above the working base plate (1), wherein a multi-axis welding robot arm (13) is mounted on the side of the working base plate (1), and a plasma arc welding head (131) is fixedly mounted on the end of the multi-axis welding robot arm (13), characterized in that: A motor shaft (21) is installed on the top side of the movable support frame (2), and a welding station (3) is connected and installed on the same side of the movable support frame (2) via the motor shaft (21); The welding station (3) includes an arc strip plate (5) and a positioning member 1 (6) and a positioning member 2 (7) movably mounted on the inner side of the top of the arc strip plate (5), wherein the positioning member 1 (6) and the positioning member 2 (7) are components made of the same structure, and the positioning member 1 (6) and the positioning member 2 (7) are not at the same horizontal height; The positioning member (6) includes a driving member (63) fixedly mounted on the outer side of the top end of the arc strip (5) and a clamping structure (62) movably mounted on one side of the driving member (63). Through the setting of the driving member (63), the clamping structure (62) rotates on one side of the driving member (63) and moves toward the center position of the arc strip (5). A metal belt (61) is wound and mounted on one side of the clamping structure (62). One end of the metal belt (61) is fixedly mounted on one side of the clamping structure (62), and the other end of the metal belt (61) passes through the clamping structure (62) and extends to the inside of the driving member (63).

2. A metal pipe welding positioning device according to claim 1, characterized in that: An L-shaped arc plate (4) is fixedly installed on the outer side of the arc strip (5), and the arc strip (5) includes a semi-arc ring 1 (55) and a semi-arc ring 2 (56) movably installed at the top, and the semi-arc ring 1 (55) and the semi-arc ring 2 (56) are slidably installed therebetween. The bottom end of the L-shaped arc plate (4) is fixedly connected to the outer side of the arc strip (5), and the horizontal height of the bottom end of the L-shaped arc plate (4) is lower than that of the semi-arc ring 2 (56). A plurality of telescopic rods 1 (41) are fixedly installed on the side of the L-shaped arc plate (4), and a plurality of corresponding telescopic rods 1 (41) are connected to the semi-arc ring 1 (55), and a plurality of corresponding telescopic rods 1 (41) are connected to the semi-arc ring 2 (56). The semi-arc ring 1 (55) is connected to the positioning component 1 (6), and the semi-arc ring 2 (56) is connected to the positioning component 2 (7).

3. A metal pipe welding positioning device according to claim 2, characterized in that: An arc ring (51) is fixedly mounted on the inner wall of the arc strip (5), and a plurality of telescopic clamping blocks (52) are movably mounted inside the arc ring (51). The plurality of telescopic clamping blocks (52) are simultaneously telescoped to clamp the metal pipe.

4. A metal pipe welding positioning device according to claim 3, characterized in that: A plurality of telescopic rods (54) are fixedly mounted on the bottom of the arc strip (5), a lifting plate (53) is fixedly mounted on the lower ends of the plurality of telescopic rods (54), a center block (531) is fixedly mounted at the center position above the lifting plate (53), a plurality of telescopic clamping blocks (532) are fixedly mounted on the outer side of the center block (531), and the plurality of telescopic clamping blocks (532) are distributed in an annular manner on the outer side of the center block (531).

5. The metal pipe welding positioning device according to claim 1, characterized in that: The driving component (63) includes an arc-shaped connecting block (631) fixedly mounted on the outside of the semi-arc ring (55) and a component housing (632) fixedly mounted on one side of the arc-shaped connecting block (631). A winding shell (633) is movably mounted on the side of the component housing (632), and the clamping structure (62) is fixedly connected to the winding shell (633).

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

7. A metal pipe welding positioning device according to claim 6, characterized in that: A plurality of inclined through-grooves (623) are provided inside the clamping structure (62), and air nozzles (624) are fixedly installed inside the plurality of through-grooves (623), and the air nozzles (624) are supplied with air by an external air pump.

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

9. A metal pipe welding positioning device according to claim 8, characterized in that: A fixed motor (6322) is fixedly mounted on the outside of the component housing (632), one end of the fixed motor (6322) is connected to a driving wheel (6323) via a shaft, and the driving wheel (6323) is located in the component housing (632) and meshes with the meshing wheel (6324).

10. The metal pipe welding positioning device according to claim 5, characterized in that: A cylindrical groove (6332) is provided inside the winding shell (633), and a winding drum (6331) is rotatably installed inside the cylindrical groove (6332). One end of the metal belt (61) passes through the clamping ring (621) and extends to the inside of the cylindrical groove (6332) and is wound by the winding drum (6331).

Images