Positioning and clamping device for flame tube plasma arc welding

Abstract

The invention discloses a positioning and clamping device for flame tube plasma arc welding, particularly relates to the technical field of welding positioning and fixing, and comprises a welding positioning frame, a bracket, a support frame and a multi-point synchronous uniform-force positioning and fixing assembly, the multi-point synchronous uniform-force positioning and fixing assembly comprises a gear motor, a transverse screw rod, two transverse sleeve blocks, a linkage strip and an inner wall clamping strip. The multi-point synchronous uniform-force positioning and fixing assembly has the advantages that synchronous multi-point accurate stress fixing of the flame tube workpiece is achieved, and the plasma arc welding accuracy of the flame tube workpiece is greatly improved, so that the problem that the flame tube workpiece cannot be synchronously positioned and fixed at multiple points according to specified extrusion force is solved; the problems that thermal deformation is prone to occurring in the plasma arc welding process due to too tight fixing, shaking and deviation occur in plasma arc welding of the flame tube due to too loose fixing, synchronous multi-point accurate stress positioning and fixing of the flame tube are difficult to achieve, and the plasma arc welding accuracy of the flame tube is poor are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of welding positioning and fixing, and more particularly to a positioning and clamping device for flame tube plasma arc welding. Background Art

[0002] In the intelligent manufacturing equipment industry, plasma arc welding machines are used for flame tube plasma arc welding, and plasma arc welding requires a plasma arc welding positioning and clamping device. This device primarily positions and secures the workpiece during the plasma arc welding process, ensuring its stability. The high temperatures generated during plasma arc welding and the vibrations of the plasma arc welding tool can easily cause the workpiece to move. The positioning and clamping device effectively secures the flame tube, maintaining its stability during plasma arc welding. Workpiece stability helps ensure weld accuracy and consistency, thereby improving plasma arc welding quality and ultimately enhancing overall product quality. This is crucial for ensuring plasma arc welding effectiveness and product quality.

[0003] In existing public literature, patent publication number CN116275803A discloses a positioning and clamping device for gas turbine flame tube assembly welding. This invention uses a clamping plate to adjust the conical tube and gas conduit, aligning the axes of the conical tube, gas conduit, and flame tube head, thereby improving flame tube welding accuracy. The invention also uses an air reservoir, a supporting airbag, and a flexible anti-slip layer to drive the flame tube to rotate, facilitating welding operations with external welding equipment. However, this technology still has the following problems.

[0004] When a plasma arc welding machine performs plasma arc welding on a flame tube, a positioning clamping device is required to position and fix the flame tube. However, during the positioning and fixing process, if only the outer point of the flame tube is positioned and fixed one by one, it is impossible to keep multiple points synchronously positioned and fixed according to the specified extrusion pressure. If the fixation is too tight, it is easy to cause thermal deformation during the plasma arc welding process, and if it is too loose, it will cause shaking and offset in the plasma arc welding of the flame tube. It is difficult to achieve synchronous multi-point precise force positioning and fixation of the flame tube, resulting in poor accuracy of the plasma arc welding of the flame tube. For this reason, a positioning clamping device for flame tube plasma arc welding is needed. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides the following technical solutions: a positioning and clamping device for flame tube plasma arc welding, comprising a welding positioning frame, a bracket and a support frame, the bracket being fixed on the lower inclined surface of the welding positioning frame, the support frame being fixed at the top end of the bracket, and a multi-point synchronous equal-force positioning and fixing component being installed on the inner wall of the support frame; the multi-point synchronous equal-force positioning and fixing component comprises a reduction motor fixed on one side of the inner wall of the support frame, and the output end of the reduction motor is fixedly connected to a transverse screw, the outer wall of the transverse screw is threadedly connected to two transverse sleeves, the two threads of the outer wall of the transverse screw are opposite and symmetrically opened, both sides of the transverse sleeve are fixedly connected to a linkage bar, and one side of the linkage bar is fixedly connected to an inner wall clamping bar.

[0006] The outer wall of each inner wall clamping strip is slidably connected to a sleeve end block, a lateral torque sensor is fixedly installed on the other side of the inner wall of the support frame, and the sensing end of the lateral torque sensor is fixedly connected to the lateral screw, and a flame tube workpiece is slidably connected to one side of the support frame.

[0007] Preferably, both transverse sleeves are slidably connected to the support frame, and the outer walls of the transverse sleeves and the inner walls of the support frame are smooth. Preferably, both inner wall clamping strips are slidably connected to the support frame. The outer walls of the inner wall clamping strips and the inner walls of the sleeve end block are smooth, and both the sleeve end block and the inner wall clamping strips are made of stainless steel.

[0008] When this technology is in use, the reduction motor drives the transverse screw to rotate. The transverse screw drives the two transverse sleeves away from each other under the action of the thread transmission force. The transverse sleeve moves right along the inner wall of the support frame, while the other transverse sleeve moves left along the inner wall of the support frame. The two linkage bars respectively drive the two inner wall clamping bars to move right. The two inner wall clamping bars are squeezed to the right position of the inner wall of the flame tube workpiece, while the other two inner wall clamping bars are simultaneously squeezed to the left position of the inner wall of the flame tube workpiece. When the torque value sensed by the transverse torque sensor is the same as the value set by the controller, the reduction motor is turned off by the controller.

[0009] Preferably, the upper surface of the support frame is fixedly connected to a sliding frame, and the inner wall of the sliding frame is provided with an end multi-point positioning and fixing component; the end multi-point positioning and fixing component includes a locking motor fixedly arranged on the inner wall of the sliding frame, and the output end of the locking motor is fixedly connected to a longitudinal screw, and the outer wall of the longitudinal screw is threadedly connected to two socket blocks, and the two threads on the outer wall of the longitudinal screw are opposite and symmetrically opened; one side of the socket block is fixedly connected to a pull rod, and one end of the pull rod is fixedly connected to the pull frame, and the inner wall of the pull frame is fixedly installed with a guide rod, and two sliding sleeve blocks are slidably connected to the outer wall of the guide rod, and the two sliding sleeve blocks are both slidably connected to the pull frame, and the sliding sleeve block is fixedly connected to the socket end block.

[0010] A longitudinal torque sensor is mounted at the bottom end of the longitudinal screw, and the sensing end of the longitudinal torque sensor is fixedly connected to the longitudinal screw. A support block is fixedly connected to one side of the outer wall of the longitudinal torque sensor, and the support block is fixedly connected to the sliding frame. The two sleeve blocks are both slidably connected to the sliding frame and are symmetrically arranged about the center of the sliding frame. The vertical cross-section of the guide rod is circular, and the outer wall of the guide rod and the inner wall of the sliding sleeve block are both smooth. A gap is provided between the pull frame and the sleeve end block, and the support block is used to support the longitudinal torque sensor.

[0011] When this technology is in use, the locking motor drives the longitudinal screw, causing the sleeve block to tilt upward and the other sleeve block to tilt downward. The pull frame causes the guide rod to tilt upward, and the two sliding sleeve blocks drive the two sleeve end blocks to tilt upward. The two sleeve end blocks tilt upward and squeeze at the bottom of the flame tube workpiece, while the other two sleeve end blocks above tilt downward and squeeze at the top of the flame tube workpiece. When the torque value sensed by the longitudinal torque sensor matches the torque value set by the controller, the controller shuts off the locking motor.

[0012] Preferably, a connecting block is fixedly connected to the lower inclined surface of the flame tube workpiece near its top, and a positioning support block is fixedly mounted at the bottom end of the connecting block, and the positioning support block is slidably connected to the flame tube workpiece. A support ring is fixedly connected to the upper inclined surface of the welding positioning frame, and a plurality of peripheral positioning blocks are fixedly connected to one side of the support ring. The plurality of peripheral positioning blocks are used to position the flame tube workpiece. A limiting sleeve is provided on both sides of the welding positioning frame, and both limiting sleeves are slidably connected to the welding positioning frame. A base is mounted at the bottom end of each limiting sleeve, and both limiting sleeves are fixedly connected to the base. A rotating shaft is rotatably connected to the inner wall of each limiting sleeve, and both rotating shafts are fixedly connected to the welding positioning frame. A rotating handle is fixedly mounted at one end of one of the rotating shafts, and a threaded locking bolt is embedded in one side of the limiting sleeve. The plurality of peripheral positioning blocks are arranged equidistantly in a circular pattern, and the two limiting sleeves are symmetrically arranged about the welding positioning frame. A controller is mounted on one side of the base, and the controller is fixedly connected to the base.

[0013] During use, this technology inserts the flame tube into the gap formed by multiple peripheral positioning blocks. A positioning frame is welded to support the support ring, which in turn supports the peripheral positioning blocks. These blocks position the flame tube at multiple points around the periphery. The positioning blocks support the bottom of the flame tube. Turning the handle rotates the shaft, and then turning the locking bolt presses it against the outer wall of the shaft.

[0014] Technical effects and advantages of the present invention:

[0015] 1. The present invention uses a multi-point synchronous force-equalizing positioning and fixing component. The reduction motor drives the transverse screw to rotate. The transverse screw drives the two transverse sleeves to move away from each other under the action of the thread transmission force. The transverse sleeve moves to the right along the inner wall of the support frame, and the other transverse sleeve moves to the left along the inner wall of the support frame. The two inner wall clamping strips are squeezed on the right side of the inner wall of the flame tube workpiece, and the other two inner wall clamping strips are squeezed on the left side of the inner wall of the flame tube workpiece at the same time. The internal synchronous multi-point precise force fixation of the flame tube workpiece can be achieved, which greatly improves the plasma arc welding accuracy of the flame tube workpiece.

[0016] 2. The present invention adopts an end multi-point positioning and fixing component, and the locking motor drives the longitudinal screw. The longitudinal screw drives the two socket blocks to approach each other under the action of the thread transmission force, the socket block tilts upward, and the other socket block tilts downward. The pull frame causes the guide rod to tilt upward, and the guide rod drives the two sliding socket blocks to tilt upward. The two lower socket end blocks are squeezed at the two end positions of the bottom end of the flame tube workpiece according to the specified extrusion force. At the same time, the other two upper socket end blocks are squeezed at the two end positions of the top end of the flame tube workpiece according to the specified extrusion force. The end of the flame tube workpiece can be precisely fixed with multi-point force at the same time, which greatly improves the accuracy of plasma arc welding of the flame tube workpiece.

[0017] 3. The present invention inserts the flame tube workpiece into the gap surrounded by multiple peripheral positioning blocks. The multiple peripheral positioning blocks perform multi-point positioning on the periphery of the flame tube workpiece. The connecting block supports the positioning block. The positioning block positions and supports the bottom end of the flame tube workpiece. The periphery and end of the flame tube workpiece are tilted and positioned. The flame tube workpiece is quickly positioned by its own gravity, which greatly improves the plasma arc welding accuracy of the flame tube workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a bottom view structural diagram of the positioning clamping device for flame tube plasma arc welding of the present invention.

[0019] Figure 2 This is a schematic diagram of the horizontal and vertical cross-sectional structures of the positioning clamping device for flame tube plasma arc welding of the present invention.

[0020] Figure 3 It is a schematic diagram of the partial structure of the cross section of the connection between the pull rod and the socket block of the present invention.

[0021] Figure 4 It is a schematic diagram of the local structure of the horizontal and vertical sections of the connection between the support frame and the reduction motor of the present invention.

[0022] Figure 5 For the present invention Figure 2 Enlarged structural diagram at point A in the middle.

[0023] Figure 6 This is a schematic diagram of the partial structure of the connection between the welding positioning frame and the connecting block of the present invention.

[0024] Figure 7 This is a schematic diagram of the main structure of the positioning clamping device for flame tube plasma arc welding of the present invention.

[0025] Figure 8 This is a schematic diagram of the partial structure of the connection between the welding positioning frame and the rotating shaft of the present invention.

[0026] Figure 9 This is a rear structural schematic diagram of the positioning clamping device for flame tube plasma arc welding of the present invention.

[0027] The accompanying drawings are marked as follows: 1. welding positioning frame; 2. bracket; 3. support frame; 4. transverse screw; 5. reduction motor; 6. transverse sleeve; 7. linkage bar; 8. inner wall clamping bar; 9. sleeve end block; 10. transverse torque sensor; 11. flame tube workpiece; 12. sliding frame; 13. longitudinal screw; 14. locking motor; 15. sleeve block; 16. pull rod; 17. pull frame; 18. guide rod; 19. sliding sleeve; 20. longitudinal torque sensor; 21. support block; 22. connecting block; 23. positioning support block; 24. support ring; 25. peripheral positioning block; 26. limit sleeve; 27. base; 28. rotating shaft; 29. rotating handle; 30. locking bolt; 31. controller. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] As attached Figure 1 - Attachment Figure 9 A positioning and clamping device for flame tube plasma arc welding is shown, and the positioning and clamping device for flame tube plasma arc welding is provided with a multi-point synchronous force-equalizing positioning and fixing component and an end multi-point positioning and fixing component. The setting of each mechanism and component can realize synchronous multi-point precise force fixation of the flame tube workpiece 11, greatly improving the plasma arc welding accuracy of the flame tube workpiece 11. The specific structural settings of each mechanism and component are as follows.

[0030] In this embodiment, as shown in the attached Figure 1 - Attachment Figure 5As shown, the bracket 2 is fixed on the lower inclined surface of the welding positioning frame 1, the support frame 3 is fixed at the top of the bracket 2, and the inner wall of the support frame 3 is installed with a multi-point synchronous equal-force positioning and fixing component; the multi-point synchronous equal-force positioning and fixing component includes a reduction motor 5 fixed on one side of the inner wall of the support frame 3, and the output end of the reduction motor 5 is fixedly connected to a transverse screw 4, the outer wall of the transverse screw 4 is threadedly connected to two transverse sleeve blocks 6, the two threads on the outer wall of the transverse screw 4 are opposite and symmetrically opened, and both sides of the transverse sleeve block 6 are fixedly connected with a linkage bar 7, and one side of the linkage bar 7 is fixedly connected to an inner wall clamping bar 8.

[0031] Each inner wall clamping strip 8 has a sliding connection to its outer wall with a sleeve end block 9. A transverse torque sensor 10 is fixedly mounted on the other side of the inner wall of the support frame 3, and its sensing end is fixedly connected to the transverse screw 4. A flame tube workpiece 11 is slidingly connected to one side of the support frame 3. Both transverse sleeve blocks 6 are slidingly connected to the support frame 3, and both their outer walls and the inner wall of the support frame 3 are smooth. Both inner wall clamping strips 8 are slidingly connected to the support frame 3. The outer walls of the inner wall clamping strips 8 and the inner walls of the sleeve end blocks 9 are smooth, and both the sleeve end blocks 9 and the inner wall clamping strips 8 are made of stainless steel.

[0032] In this embodiment, as shown in the attached Figure 3 - Attachment Figure 5 As shown, the upper surface of the support frame 3 is fixedly connected to the sliding frame 12, and the inner wall of the sliding frame 12 is provided with an end multi-point positioning and fixing assembly; the end multi-point positioning and fixing assembly includes a locking motor 14 fixedly arranged on the inner wall of the sliding frame 12, and the output end of the locking motor 14 is fixedly connected to the longitudinal screw 13, and the outer wall of the longitudinal screw 13 is threadedly connected to two socket blocks 15, and the two threads on the outer wall of the longitudinal screw 13 are opposite and symmetrical.

[0033] A pull rod 16 is fixedly connected to one side of the sleeve block 15. A pull frame 17 is fixedly connected to one end of the pull rod 16. A guide rod 18 is fixedly mounted on the inner wall of the pull frame 17. Two sliding sleeves 19 are slidably connected to the outer wall of the guide rod 18. Both sliding sleeves 19 are slidably connected to the pull frame 17 and fixedly connected to the sleeve end block 9. A longitudinal torque sensor 20 is mounted at the bottom end of the longitudinal screw 13, and the sensing end of the longitudinal torque sensor 20 is fixedly connected to the longitudinal screw 13. A support block 21 is fixedly connected to one side of the outer wall of the longitudinal torque sensor 20, and fixedly connected to the sliding frame 12. Both sleeve blocks 15 are slidably connected to the sliding frame 12 and are symmetrically arranged about the middle of the sliding frame 12. The vertical cross-section of the guide rod 18 is circular, and the outer wall of the guide rod 18 and the inner wall of the sliding sleeve 19 are smooth. A gap is provided between the pull frame 17 and the sleeve end block 9 , and the support block 21 is used to support the longitudinal torque sensor 20 .

[0034] In this embodiment, as shown in the attached Figure 6-9 As shown, a connecting block 22 is fixedly connected to the lower inclined surface of the flame tube workpiece 11 near its top position, and a positioning support block 23 is fixedly installed on the bottom end of the connecting block 22, and the positioning support block 23 is slidably connected to the flame tube workpiece 11; a support ring 24 is fixedly connected to the upper inclined surface of the welding positioning frame 1, and a plurality of peripheral positioning blocks 25 are fixedly connected to one side of the support ring 24. The plurality of peripheral positioning blocks 25 are used to position the flame tube workpiece 11, and a limiting sleeve 26 is provided on both sides of the welding positioning frame 1. The two limiting sleeves 26 are slidably connected to the welding positioning frame 1, and a base 27 is installed at the bottom end of the limiting sleeve 26. The two limiting sleeves 26 are fixedly connected to the base 27; the inner wall of each limiting sleeve 26 is rotatably connected to a rotating shaft 28, and the two rotating shafts 28 are fixedly connected to the welding positioning frame 1. A rotating handle 29 is fixedly installed at one end of one of the rotating shafts 28, and a threaded locking bolt 30 is embedded in one side of the limiting sleeve 26. A plurality of peripheral positioning blocks 25 are arranged in a circular ring with equal spacing, and two limiting sleeves 26 are symmetrically arranged about the welding positioning frame 1. A controller 31 is installed on one side of the base 27, and the controller 31 is fixedly connected to the base 27.

[0035] The working principle of the positioning clamping device for plasma arc welding of the flame tube used in the plasma arc welding machine of the present invention is as follows:

[0036] Step 1: During the tilted positioning installation, the flame tube workpiece 11 is inserted into the gap surrounded by multiple peripheral positioning blocks 25. The support ring 24 is supported by the welding positioning frame 1. The support ring 24 supports multiple peripheral positioning blocks 25. The multiple peripheral positioning blocks 25 perform multi-point positioning on the periphery of the flame tube workpiece 11. At the same time, the welding positioning frame 1 supports the connecting block 22, the connecting block 22 supports the positioning support block 23, and the positioning support block 23 positions and supports the bottom end of the flame tube workpiece 11. Then, the rotating handle 29 is rotated, and the rotating handle 29 drives the rotating shaft 28 to rotate. The rotating shaft 28 drives the welding positioning frame 1 to rotate to the adjustment angle, and then the locking bolt 30 is rotated. Under the action of the threaded transmission force, the locking bolt 30 and the limiting sleeve 26 are squeezed on the outer wall of the rotating shaft 28, thereby achieving the fixing operation of the rotating shaft 28, and the base 27 provides stable support force for the two limiting sleeves 26.

[0037] Step 2. When multiple points are synchronously positioned and fixed with equal force, the reduction motor 5 is started through the controller 31. The reduction motor 5 drives the transverse screw 4 to rotate. The transverse screw 4 rotates inside the support frame 3. The transverse screw 4 drives the two transverse sleeves 6 to move away from each other under the action of the thread transmission force. The transverse sleeve 6 moves right along the inner wall of the support frame 3, and the other transverse sleeve 6 moves left along the inner wall of the support frame 3. The transverse sleeve 6 drives the two linkage bars 7 to move right. The two linkage bars 7 respectively drive the two inner wall clamping bars 8 to move right. The inner wall clamping bars 8 drive the socket end block 9 to move right. The two inner wall clamping bars 8 are squeezed on the right side of the inner wall of the flame tube workpiece 11, and the other two inner wall clamping bars 8 are squeezed on the left side of the inner wall of the flame tube workpiece 11 at the same time. When the torque value sensed by the transverse torque sensor 10 is the same as the value set by the controller 31, the reduction motor 5 is turned off through the controller 31. Please refer to the attached document for the movement direction described in the above paragraph. Figure 2 - Attachment Figure 5 The view orientation.

[0038] Step 3: When the end is positioned and fixed at multiple points, the locking motor 14 is started by the controller 31 to realize electrical connection drive. The locking motor 14 drives the longitudinal screw 13. The longitudinal screw 13 drives the two socket blocks 15 to approach each other under the action of the thread transmission force. The socket block 15 tilts upward and the other socket block 15 tilts downward. The socket block 15 drives the pull rod 16 to tilt upward. The pull rod 16 drives the pull frame 17 to tilt upward. The pull frame 17 causes the guide rod 18 to tilt upward. The guide rod 18 drives the two sliding sleeves 19 to tilt upward. The two sliding sleeves 19 respectively drive the two socket end blocks 9 to tilt upward. The two socket end blocks 9 tilt upward and squeeze at the bottom end position of the flame tube workpiece 11. At the same time, the other two socket end blocks 9 above will also move downward synchronously. The other two socket end blocks 9 above will tilt downward and squeeze at the top end position of the flame tube workpiece 11.

[0039] The support block 21 is supported by the sliding frame 12, and the support block 21 supports the longitudinal torque sensor 20, which senses the torque of the longitudinal screw 13. When the torque value sensed by the longitudinal torque sensor 20 is the same as the torque value set by the controller 31, the locking motor 14 is turned off by the controller 31, so that the two lower sleeve end blocks 9 are squeezed at the two end positions of the bottom end of the flame tube workpiece 11 according to the specified extrusion force, and at the same time, the other two upper sleeve end blocks 9 are squeezed at the two end positions of the top end of the flame tube workpiece 11 according to the specified extrusion force. In this way, the flame tube workpiece 11 is synchronized at multiple points and precisely positioned and fixed with force. After positioning and fixing, the gap on the flame tube workpiece 11 can be plasma arc welded through the welding gun part of the plasma arc welding machine. Please refer to the attached for the movement direction described in the above paragraph. Figure 3 - Attachment Figure 5 The view orientation.

[0040] The contents not described in detail in the specification belong to the existing technology known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited, and conventional equipment can be used. In this technical solution, the electrical control components not mentioned are not shown in the figure because they belong to the existing technology and are not described here.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A positioning clamping device for flame tube plasma arc welding, comprising a welding positioning frame (1), a bracket (2) and a support frame (3), wherein the bracket (2) is fixed on the lower inclined surface of the welding positioning frame (1), and the support frame (3) is fixed on the top of the bracket (2), characterized in that: The inner wall of the support frame (3) is equipped with a multi-point synchronous force-averaging positioning and fixing assembly; The multi-point synchronous uniform force positioning and fixing component comprises a reduction motor (5) fixed on one side of the inner wall of the support frame (3), and the output end of the reduction motor (5) is fixedly connected to a transverse screw (4), the outer wall of the transverse screw (4) is threadedly connected to two transverse sleeves (6), the two threads of the outer wall of the transverse screw (4) are opposite and symmetrically opened, both sides of the transverse sleeve (6) are fixedly connected to a linkage bar (7), and one side of the linkage bar (7) is fixedly connected to an inner wall clamping bar (8); The outer wall of each inner wall clamping strip (8) is slidably connected to a sleeve end block (9), a lateral torque sensor (10) is fixedly installed on the other side of the inner wall of the support frame (3), and the sensing end of the lateral torque sensor (10) is fixedly connected to the lateral screw (4), and a flame tube workpiece (11) is slidably connected to one side of the support frame (3).

2. The positioning clamping device for flame tube plasma arc welding according to claim 1, characterized in that: The two transverse sleeve blocks (6) are both slidably connected to the support frame (3), and the outer wall of the transverse sleeve block (6) and the inner wall of the support frame (3) are both smooth surfaces; The two inner wall clamping strips (8) are both slidably connected to the support frame (3).

3. The positioning clamping device for flame tube plasma arc welding according to claim 1, characterized in that: The outer wall of the inner wall clamping strip (8) and the inner wall of the sleeve end block (9) are both smooth surfaces, and the sleeve end block (9) and the inner wall clamping strip (8) are both made of stainless steel.

4. The positioning clamping device for flame tube plasma arc welding according to claim 1, characterized in that: The upper surface of the support frame (3) is fixedly connected to a sliding frame (12), and the inner wall of the sliding frame (12) is provided with an end multi-point positioning and fixing component; The end multi-point positioning and fixing assembly includes a locking motor (14) fixedly arranged on the inner wall of the sliding frame (12), and the output end of the locking motor (14) is fixedly connected to a longitudinal screw (13), the outer wall of the longitudinal screw (13) is threadedly connected to two socket blocks (15), and the two threads on the outer wall of the longitudinal screw (13) are opposite and symmetrically opened; A pull bar (16) is fixedly connected to one side of the sleeve block (15), a pull frame (17) is fixedly connected to one end of the pull bar (16), and a guide rod (18) is fixedly installed on the inner wall of the pull frame (17), and two sliding sleeve blocks (19) are slidably connected to the outer wall of the guide rod (18), and the two sliding sleeve blocks (19) are slidably connected to the pull frame (17), and the sliding sleeve blocks (19) are fixedly connected to the sleeve end block (9); A longitudinal torque sensor (20) is installed at the bottom end of the longitudinal screw (13), and the sensing end of the longitudinal torque sensor (20) is fixedly connected to the longitudinal screw (13). A support block (21) is fixedly connected to one side of the outer wall of the longitudinal torque sensor (20), and the support block (21) is fixedly connected to the slide frame (12).

5. The positioning clamping device for flame tube plasma arc welding according to claim 4, characterized in that: The two sleeve blocks (15) are both slidably connected to the slide frame (12), and the two sleeve blocks (15) are symmetrically arranged about the middle of the slide frame (12).

6. The positioning clamping device for flame tube plasma arc welding according to claim 4, characterized in that: The vertical cross-section of the guide rod (18) is circular, and the outer wall of the guide rod (18) and the inner wall of the sliding sleeve (19) are both smooth surfaces.

7. The positioning clamping device for flame tube plasma arc welding according to claim 4, characterized in that: A gap is provided between the pull frame (17) and the sleeve end block (9), and the support block (21) is used to support the longitudinal torque sensor (20).

8. The positioning clamping device for flame tube plasma arc welding according to claim 1, characterized in that: A connecting block (22) is fixedly connected to the lower inclined surface of the flame tube workpiece (11) near its top end, a positioning support block (23) is fixedly installed at the bottom end of the connecting block (22), and the positioning support block (23) is slidably connected to the flame tube workpiece (11); The upper inclined surface of the welding positioning frame (1) is fixedly connected to a support ring (24), and one side of the support ring (24) is fixedly connected to a plurality of peripheral positioning blocks (25), and the plurality of peripheral positioning blocks (25) are used to position the flame tube workpiece (11). Both sides of the welding positioning frame (1) are provided with limiting sleeves (26), and the two limiting sleeves (26) are slidably connected to the welding positioning frame (1). The bottom end of the limiting sleeve (26) is installed with a base (27), and the two limiting sleeves (26) are fixedly connected to the base (27); The inner wall of each limiting sleeve (26) is rotatably connected to a rotating shaft (28), and the two rotating shafts (28) are fixedly connected to the welding positioning frame (1). A rotating handle (29) is fixedly installed at one end of one of the rotating shafts (28), and a threaded locking bolt (30) is embedded on one side of the limiting sleeve (26).

9. The positioning clamping device for flame tube plasma arc welding according to claim 8, characterized in that: The plurality of peripheral positioning blocks (25) are arranged in a circular ring with equal spacing, and the two limiting sleeves (26) are symmetrically arranged with respect to the welding positioning frame (1).

10. The positioning clamping device for flame tube plasma arc welding according to claim 8, characterized in that: A controller (31) is installed on one side of the base (27), and the controller (31) is fixedly connected to the base (27).

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