Positioning and clamping device for welding copper tubes for heat exchangers

Abstract

The present application relates to the field of copper pipe processing, and particularly relates to a positioning and clamping device for copper pipe welding for heat exchanger, which comprises a copper pipe welding table and hydraulic cylinders arranged on the surfaces of the two sides of the copper pipe welding table, the piston rod of the hydraulic cylinder is fixedly connected with a fixed arm plate on one end surface, the outer surface of the fixed arm plate is fixedly connected with a clamping tooth pushing plate, and two groups of transmission rods are movably sleeved on the surfaces of the two sides of the copper pipe welding table and located at the top edge positions. After the positioning of the copper pipe is completed, the welding device is used to weld the adhering connection of the copper pipe, in the process of welding, the fixed arm plate can be moved up and down by cooperating with the hydraulic cylinder, the transmission gear on the outer surface of the transmission rod can be pushed by the clamping tooth pushing plate on the outer surface of the fixed arm plate, and when the copper pipe clamping table is turned over, the pushing precision of the hydraulic cylinder can be finely controlled by the precision speed regulating valve.

Description

Technical Field

[0001] This invention belongs to the field of copper tube processing technology, specifically a positioning and clamping device for welding copper tubes for heat exchangers. Background Technology

[0002] Copper pipe welding positioning and clamping devices have broad application prospects and market demand in industrial production. A copper pipe welding positioning and clamping device is a device used to position and clamp copper pipes for welding. During the copper pipe welding process, it is necessary to ensure the accurate position of the copper pipe and stabilize it through the clamping device to ensure the quality and efficiency of the welding. This device can be widely used in copper pipe welding processes, including pipeline engineering, air conditioning and refrigeration, heat exchanger manufacturing and other fields.

[0003] In current technologies, when large fixtures driven by hydraulic cylinders and racks are used for laser welding after positioning, the fixtures themselves are heavy and the pressure balance of the hydraulic system is poor. This results in instability and low precision during the rotation and positioning process, which in turn affects the welding quality.

[0004] Therefore, the present invention provides a positioning and clamping device for welding copper tubes for heat exchangers. Summary of the Invention

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

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: The positioning and clamping device for welding copper tubes for heat exchangers according to the present invention includes a copper tube welding table and hydraulic cylinders disposed on both sides of the copper tube welding table. A fixed arm plate is fixedly connected to one end of the piston rod of the hydraulic cylinder. A toothed push plate is fixedly connected to the outer side of the fixed arm plate. Two sets of transmission rods are movably sleeved on both sides of the copper tube welding table and at the top edge. A transmission gear meshing with the outer side of the toothed push plate is provided on the outer side of one end of the two sets of transmission rods. A copper tube clamping table is fixedly connected to the other end of the two sets of transmission rods. Two sets of precision speed regulating valves are fixedly installed on the two oil pipes of the hydraulic cylinder and the oil pipes are connected to the oil pipes of the precision speed regulating valves. Multiple copper tubes are movably sleeved on the outer side of the copper tube clamping table.

[0007] Preferably, a clamping plate is oscillatingly connected to the top surface of the copper tube clamping platform, and a lower copper tube limiting groove and an upper copper tube limiting groove are respectively provided on the side surface of the copper tube clamping platform and the clamping plate that are in contact with each other.

[0008] Preferably, the outer surface of the second copper tube is movably attached to the inner wall of the lower copper tube limiting groove and the upper copper tube limiting groove, and a copper tube clamping groove is provided on the inner wall of the copper tube clamping platform at the middle position.

[0009] Preferably, a copper tube is movably sleeved on the inner wall of the copper tube clamping groove, and the position of the copper tube is set at the bottom edge of the copper tube.

[0010] Preferably, copper tube adjusters are symmetrically arranged on both sides of the copper tube clamping platform, and the outer surface of the output end of the copper tube adjuster is movably attached to both ends of the copper tube.

[0011] Preferably, the bottom surface of the copper tube adjuster is provided with multiple sets of electro-hydraulic actuators, and the piston rod surface of the electro-hydraulic actuators is fixedly connected with a push block that is movably sleeved on the inner wall of the copper tube adjuster.

[0012] Preferably, the top surface of the push block is provided with an arc-shaped rounded corner, and one side surface of the push block is provided with a semi-circular overlapping arm that is movably sleeved on the outer surface of the copper tube.

[0013] Preferably, a damping rod is fixedly connected to the inner wall of the lower copper tube limiting groove and the upper copper tube limiting groove, and an elastic wire is movably sleeved on the outer surface of the damping rod. An extrusion strip is fixedly connected to the other end of the damping rod and the elastic wire, and anti-slip soft strips are respectively provided on the mating surfaces of the two sets of extrusion strips.

[0014] Preferably, the inner wall surface of the anti-slip strip is movably attached to the outer surface of the second copper tube, the outer surface of the extrusion strip is movably sleeved inside the lower copper tube limiting groove, the two sides of the extrusion strip are symmetrically and fixedly connected with limiting blocks, and the two sides of the inner wall surface of the lower copper tube limiting groove are provided with limiting grooves at positions corresponding to the limiting blocks.

[0015] Preferably, a fixed arm is fixedly installed on the bottom surface of the hydraulic cylinder, and the outer surface of the fixed arm is fixedly connected to the outer surface of the copper pipe welding station.

[0016] The beneficial effects of this invention are as follows: 1. The positioning and clamping device for welding copper tubes in a heat exchanger as described in this invention, after the copper tube is positioned, is used in conjunction with a welding device to weld the fitting joint of the copper tube. During the welding process, a hydraulic cylinder can be used to move the fixed arm plate up and down, and a toothed push plate on the outer surface of the fixed arm plate can be used to push the transmission gear on the outer surface of the transmission rod. When the copper tube clamping platform is flipped, the pushing accuracy of the hydraulic cylinder can be precisely controlled by a precision speed control valve, so that the transmission rod drives the copper tube clamping platform to adjust the angle, ensuring that the copper tube clamping platform can maintain extremely high stability and high precision when flipping and positioning. 2. The positioning and clamping device for welding copper tubes in a heat exchanger as described in this invention, when the lower copper tube limiting groove and the upper copper tube limiting groove are connected, the anti-slip soft strip inside the lower and upper copper tube limiting grooves gently overlaps the surface of the second copper tube, initially limiting the position of the second copper tube. Subsequently, the push block is lifted by the electro-hydraulic push rod, and the arc-shaped rounded corner on the top surface of the push block slides at one end of the second copper tube. At this time, the arc-shaped surface of the arc-shaped rounded corner is used so that when the push block is lifted, one end of the second copper tube will slide to one side under the traction of the arc-shaped rounded corner, thereby adjusting the angle and position of the second copper tube. The push blocks on both sides of the second copper tube are adjusted at the same time, so that the second copper tube can be adjusted synchronously and the position of some parts of the second copper tube will not be too tilted. 3. The positioning and clamping device for welding copper tubes for heat exchangers described in this invention, after the second copper tube is limited by the semi-circular overlapping arm and the push block, is continuously pressed down in conjunction with the upper copper tube limiting groove, and the small gap left between the lower copper tube limiting groove and the upper copper tube limiting groove is closed, so that the anti-slip soft strip inside the extrusion strip can be firmly attached to the surface of the second copper tube. The anti-slip soft strip will deform under the extrusion of the lower copper tube limiting groove and the upper copper tube limiting groove. The deformed anti-slip soft strip increases the contact area and friction between it and the second copper tube, so that the second copper tube can be firmly limited inside the extrusion strip. At the same time, the thickness of the anti-slip soft strip can effectively limit and restrict the second copper tube that is smaller than the size of the hole of the clamping product. 4. The positioning and clamping device for welding copper tubes in heat exchangers described in this invention, when the extrusion bar needs to clamp copper tubes larger than the size of the holes in the clamping product, the anti-slip soft strip can effectively prevent the extrusion bar of the metal product from directly contacting the outer surface of the copper tube, greatly reducing the deformation of the copper tube caused by external pressure due to the holes in the metal clamping product. At the same time, as the lower copper tube limiting groove and the upper copper tube limiting groove extrude the copper tube, the extrusion bar will slide inside the lower copper tube limiting groove and the limiting groove under the limitation of the limiting block, thereby compressing the damping rod and the elastic wire, and using the reverse elastic force of the elastic wire to push the extrusion bar, thereby increasing the extrusion force and adhesion between the anti-slip soft strip and the copper tube, achieving the effect of providing a certain extrusion error tolerance when the extrusion bar moves inside the lower copper tube limiting groove and the upper copper tube limiting groove extrudes large-sized copper tubes. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1 This is a perspective view of the present invention; Figure 2 This is a perspective view illustrating the flipping of the copper tube clamping platform in this invention; Figure 3 This is a three-dimensional view of the precision speed control valve in this invention; Figure 4 This is a three-dimensional view of the unfolded copper tube clamping platform of the present invention; Figure 5 This is a three-dimensional schematic diagram of the working process of the copper tube adjuster in this invention; Figure 6 This is a three-dimensional cross-sectional view of the upper copper tube limiting groove and the limiting groove in this invention; Figure 7 This is a three-dimensional cross-sectional view of the upper copper tube limiting groove and the limiting groove docking in this invention; Figure 8 This is a three-dimensional perspective view of the upper copper tube limiting groove and the limiting groove in cross-section, showing their connection.

[0019] In the diagram: 11. Copper pipe welding table; 12. Fixed arm; 121. Hydraulic cylinder; 122. Fixed arm plate; 123. Gear push plate; 124. Transmission gear; 125. Transmission rod; 126. Precision speed control valve; 127. Copper pipe clamping table; a1. Copper pipe clamping groove; a2. Lower copper pipe limiting groove; a21. Upper copper pipe limiting groove; a22. Limiting groove; a23. Damping rod; a24. Elastic wire; a25. Extrusion strip; a26. Anti-slip soft strip; a27. Limiting block; a3. Copper pipe one; a4. Copper pipe two; a5. Copper pipe adjuster; a51. Electro-hydraulic actuator; a52. Push block; a53. Arc-shaped rounded corner; a54. Semi-circular overlapping arm; 13. Clamping plate. Detailed Implementation

[0020] 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.

[0021] like Figures 1 to 3 As shown in the figure, a positioning and clamping device for welding copper tubes for heat exchangers according to an embodiment of the present invention includes a copper tube welding table 11 and hydraulic cylinders 121 disposed on both sides of the copper tube welding table 11. A fixed arm plate 122 is fixedly connected to one end of the piston rod of the hydraulic cylinder 121. A toothed push plate 123 is fixedly connected to the outer side of the fixed arm plate 122. Two sets of transmission rods 125 are movably sleeved on both sides of the copper tube welding table 11 at the top edge. A transmission gear 124 is provided on the outer side of one end of the two sets of transmission rods 125 and meshes with the outer side of the toothed push plate 123. A copper tube clamping table 127 is fixedly connected to the other end of the two sets of transmission rods 125. Two sets of precision speed regulating valves are fixedly installed on the two oil pipes of the hydraulic cylinder 121, and the oil pipes are connected to the oil pipes of the precision speed regulating valves 126. Multiple copper tubes a4 are movably sleeved on the outer side of the copper tube clamping table 127.

[0022] After the copper tube 2 a4 is positioned, the welding device is used to weld the joint of the copper tube 2 a4. During the welding process, the hydraulic cylinder 121 can be used to move the fixed arm plate 122 up and down. The toothed push plate 123 on the outer surface of the fixed arm plate 122 pushes the transmission gear 124 on the outer surface of the transmission rod 125. When the copper tube clamping table 127 is flipped, the precision speed control valve 126 can be used to finely control the pushing accuracy of the hydraulic cylinder 121. This allows the transmission rod 125 to drive the copper tube clamping table 127 to adjust the angle, ensuring that the copper tube clamping table 127 can maintain extremely high stability and high precision when it is flipped and positioned. The precision speed control valve 126, as a pressure-compensated throttle valve, is typically composed of a differential pressure reducing valve and a throttle valve connected in series. Regardless of changes in external load or fluctuations in system pressure, the precision speed control valve 126 automatically maintains a constant pressure difference across the throttle orifice, thus ensuring a constant flow rate through the valve. For example, when hydraulic oil flows through the precision speed control valve 126, it first experiences a pressure drop through the throttle valve before entering the differential pressure reducing valve. The differential pressure reducing valve and the throttle valve work together to maintain a constant pressure difference across the throttle orifice. Maintaining a set constant pressure difference, when the actuator of the precision speed control valve 126 encounters significant resistance, the outlet pressure of the throttle valve will increase. The constant pressure reducing valve core will sense the imbalance of forces at both ends and move to the right, which will increase the opening of the pressure reducing port and decrease the pressure, thereby pushing up the pressure at the inlet of the throttle valve. Ultimately, the pressure difference before and after the throttle port will be restored to the original set value, and the flow rate will remain stable. Conversely, if the resistance decreases and the outlet pressure drops, the pressure reducing valve core will move to the left to close the pressure reducing port and reduce the inlet pressure, thus maintaining the absolute constant pressure difference and flow rate.

[0023] like Figures 4 to 8As shown, a clamping plate 13 is oscillatingly connected to the top surface of the copper tube clamping platform 127. The sides of the copper tube clamping platform 127 and the clamping plate 13 that are in contact with each other are respectively provided with a lower copper tube limiting groove a2 and an upper copper tube limiting groove a21. Multiple sets of electro-hydraulic push rods a51 are provided on the bottom surface of the copper tube adjuster a5. A push block a52 is fixedly connected to the piston rod surface of the electro-hydraulic push rod a51 and is movably sleeved on the inner wall of the copper tube adjuster a5. The top surface of the push block a52 is provided with an arc-shaped rounded corner a53. A semi-circular overlapping arm a54 is provided on one side surface of the push block a52 and is movably sleeved on the outer surface of the copper tube a4. The lower copper tube limiting groove a2 and the upper copper tube limiting groove a21 are also provided. A damping rod a23 is fixedly connected to the inner wall of 1. An elastic wire a24 is movably sleeved on the outer surface of the damping rod a23. An extrusion strip a25 is fixedly connected to the other end of the damping rod a23 and the elastic wire a24. The inner wall of the anti-slip soft strip a26 is movably attached to the outer surface of the copper tube a4. Anti-slip soft strips a26 are respectively provided on the contact surfaces of the two sets of extrusion strips a25. The outer surface of the extrusion strip a25 is movably sleeved inside the lower copper tube limiting groove a2. Limiting blocks a27 are symmetrically fixedly connected to the two sides of the extrusion strip a25. Limiting grooves a22 are opened on the inner walls of the two sides of the lower copper tube limiting groove a2 at positions corresponding to the limiting blocks a27.

[0024] When the lower copper tube limiting groove a2 and the upper copper tube limiting groove a21 are connected, the anti-slip soft strip a26 inside the lower copper tube limiting groove a2 and the upper copper tube limiting groove a21 gently overlaps the surface of the second copper tube a4, initially limiting the position of the second copper tube a4. Subsequently, the electro-hydraulic actuator a51 lifts the push block a52, causing the arc-shaped rounded corner a53 on the top surface of the push block a52 to slide at one end of the second copper tube a4. At this time, the arc-shaped rounded corner a53 is used to... The curved surface of the copper tube a4 causes one end of the copper tube a4 to slide to one side under the pull of the curved rounded corner a53 when the push block a52 is lifted, thereby adjusting the angle and position of the copper tube a4. The push blocks a52 on both sides of the copper tube a4 are adjusted at the same time, which can adjust the copper tube a4 synchronously and prevent the position of the copper tube a4 from being too tilted. Adjusting only one end will also prevent the copper tube a4 from being effectively adjusted. As push block a52 rises, the top surface of push block a52 will create an upward tilting angle on one end of copper tube a4. However, under the constraint of the upper copper tube limiting groove a21, copper tube a4 will not have an excessive tilting angle. At the same time, under the traction of the arc angle of the arc corner a53, copper tube a4 will have a downward thrust moving towards the copper tube limiting groove a2. The traction of the arc angle of the arc corner a53 can effectively reduce the squeezing force between one end of copper tube a4 and the surface of the arc corner a53. When copper tube a4 is pushed in the opposite direction by the two sets of push blocks a52, it will be positioned at the center of the lower copper tube limiting groove a2. Then, the semi-circular overlapping arm a54 on the outer surface of the push block a52 will fit onto the bottom outer surface of copper tube a4, thereby limiting the position of copper tube a4. This will prevent copper tube a4 from shifting too much in subsequent processing. After the copper tube a4 is defined by the semi-circular overlapping arm a54 and the push block a52, it is continuously pressed down in conjunction with the copper tube limiting groove a21, and the small gap left between the lower copper tube limiting groove a2 and the upper copper tube limiting groove a21 is closed. This allows the anti-slip soft strip a26 inside the extrusion strip a25 to be firmly attached to the surface of the copper tube a4. The anti-slip soft strip a26 will deform under the extrusion of the lower copper tube limiting groove a2 and the upper copper tube limiting groove a21. The deformed anti-slip soft strip a26 increases the contact area and friction between it and the copper tube a4, so that the copper tube a4 can be firmly defined inside the extrusion strip a25. At the same time, the thickness of the anti-slip soft strip a26 can effectively limit and define copper tubes a4 that are smaller than the size of the clamping product hole. When the extrusion bar a25 needs to clamp copper tubes a24 that are larger than the size of the holes in the clamping products, the anti-slip strip a26 can effectively prevent the extrusion bar a25 from directly contacting the outer surface of the copper tube a4, greatly reducing the deformation of the copper tube a4 caused by external pressure due to the holes in the clamping products. Simultaneously, as the lower copper tube limiting groove a2 and the upper copper tube limiting groove a21 extrude pressure on the copper tube a4, the extrusion bar a25 slides within the lower copper tube limiting groove a2 and the limiting groove a22 under the constraint of the limiting block a27, thereby compressing the damping rod a23 and the elastic wire a24, and utilizing the elastic wire a2... The reverse elastic force of 4 pushes the extrusion strip a25, thereby increasing the extrusion force and adhesion between the anti-slip soft strip a26 and the copper tube a4. This allows the extrusion strip a25 to move inside the lower copper tube limiting groove a2, providing a certain extrusion tolerance when the lower copper tube limiting groove a2 and the upper copper tube limiting groove a21 extrude the large-size copper tube a4. This avoids the situation where the extrusion angle and force of the lower copper tube limiting groove a2 and the upper copper tube limiting groove a21 are limited and cannot be randomly changed with the size of the copper tube a4.

[0025] like Figure 4 As shown, the outer surface of copper tube a4 is movably attached to the inner wall of the lower copper tube limiting groove a2 and the upper copper tube limiting groove a21. A copper tube clamping groove a1 is provided on the inner wall of the copper tube clamping platform 127 at the middle position. A copper tube a3 is movably sleeved on the inner wall of the copper tube clamping groove a1. The position of copper tube a3 is set at the bottom edge of copper tube a4. Copper tube adjusters a5 are symmetrically arranged on both sides of the copper tube clamping platform 127. The outer surface of the output end of the copper tube adjuster a5 is movably attached to both ends of copper tube a4.

[0026] Multiple copper tubes a4 are placed on the inner walls of the copper tube clamping groove a1 and the lower copper tube limiting groove a2, respectively. At this time, the clamping plate 13 is swung so that the upper copper tube limiting groove a21 on the bottom surface of the clamping plate 13 is fitted onto the top surface of the copper tube a4. The angle and position of the copper tube a4 are adjusted with the copper tube adjuster a5. Then, the copper tube a4 is positioned by the mutual pressing between the clamping plate 13 and the copper tube clamping table 127. Finally, the multiple copper tubes a4 are welded and positioned with the welding device.

[0027] Working principle: Multiple copper tubes a4 are placed on the inner walls of the copper tube clamping groove a1 and the lower copper tube limiting groove a2, respectively. The clamping plate 13 is then swung so that the upper copper tube limiting groove a21 on the bottom surface of the clamping plate 13 engages with the top surface of the copper tube a4. The angle and position of the copper tubes a4 are then adjusted using the copper tube adjuster a5. The copper tubes a4 are then positioned by the mutual pressing between the clamping plate 13 and the copper tube clamping table 127. Finally, the welding device is used to weld and position the multiple copper tubes a4. During the process, the fixed arm plate 122 can be moved up and down in conjunction with the hydraulic cylinder 121, and the toothed push plate 123 on the outer surface of the fixed arm plate 122 can push the transmission gear 124 on the outer surface of the transmission rod 125. When the copper tube clamping platform 127 is flipped, the pushing accuracy of the hydraulic cylinder 121 can be precisely controlled by the precision speed regulating valve 126, so that the transmission rod 125 drives the copper tube clamping platform 127 to adjust the angle, ensuring that the copper tube clamping platform 127 can maintain extremely high stability and high precision when flipping and positioning.

[0028] 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 and clamping device for welding copper tubes for heat exchangers, comprising a copper tube welding table (11) and hydraulic cylinders (121) disposed on both sides of the copper tube welding table (11), characterized in that: A fixed arm plate (122) is fixedly connected to one end of the piston rod of the hydraulic cylinder (121). A toothed push plate (123) is fixedly connected to the outer surface of the fixed arm plate (122). Two sets of transmission rods (125) are movably sleeved on both sides of the copper tube welding table (11) at the top edge. A transmission gear (124) meshing with the outer surface of the toothed push plate (123) is provided on the outer surface of one end of the two sets of transmission rods (125). A copper tube clamping platform (127) is fixedly connected to the other end of the two sets of transmission rods (125). Two sets of precision speed regulating valves are fixedly installed on the two oil pipes of the hydraulic cylinder (121), and the oil pipes are connected to the oil pipes of the precision speed regulating valves (126). Multiple copper tubes (a4) are movably sleeved on the outer surface of the copper tube clamping platform (127).

2. The positioning and clamping device for welding copper tubes in a heat exchanger according to claim 1, characterized in that: The top surface of the copper tube clamping platform (127) is oscillatingly connected to a clamping plate (13). The copper tube clamping platform (127) and the clamping plate (13) are respectively provided with a lower copper tube limiting groove (a2) and an upper copper tube limiting groove (a21) on the side surface where they are in contact.

3. The positioning and clamping device for welding copper tubes in a heat exchanger according to claim 1, characterized in that: The outer surface of the second copper tube (a4) is movably attached to the inner wall of the lower copper tube limiting groove (a2) and the upper copper tube limiting groove (a21). The inner wall of the copper tube clamping platform (127) is provided with a copper tube snap-fit ​​groove (a1) located in the middle.

4. The positioning and clamping device for welding copper tubes in a heat exchanger according to claim 3, characterized in that: The inner wall of the copper pipe clamping groove (a1) is movably fitted with copper pipe one (a3), and the position of copper pipe one (a3) ​​is set at the bottom edge of copper pipe two (a4).

5. A positioning and clamping device for welding copper tubes for heat exchangers according to claim 1, characterized in that: The copper tube clamping platform (127) is symmetrically provided with copper tube adjusters (a5) on both sides, and the outer surface of the output end of the copper tube adjuster (a5) is movably attached to both ends of the copper tube (a4).

6. A positioning and clamping device for welding copper tubes for heat exchangers according to claim 5, characterized in that: The bottom surface of the copper tube adjuster (a5) is provided with multiple sets of electro-hydraulic actuators (a51), and the piston rod surface of the electro-hydraulic actuator (a51) is fixedly connected with a push block (a52) that is movably sleeved on the inner wall of the copper tube adjuster (a5).

7. A positioning and clamping device for welding copper tubes in a heat exchanger according to claim 6, characterized in that: The top surface of the push block (a52) is provided with an arc-shaped rounded corner (a53), and one side surface of the push block (a52) is provided with a semi-circular overlapping arm (a54) that is movably sleeved on the outer surface of the copper tube (a4).

8. A positioning and clamping device for welding copper tubes for heat exchangers according to claim 2, characterized in that: A damping rod (a23) is fixedly connected to the inner wall of the lower copper tube limiting groove (a2) and the upper copper tube limiting groove (a21). An elastic wire (a24) is movably sleeved on the outer surface of the damping rod (a23). An extrusion strip (a25) is fixedly connected to the other end of the damping rod (a23) and the elastic wire (a24). Anti-slip soft strips (a26) are respectively provided on the mating surfaces of the two sets of extrusion strips (a25).

9. A positioning and clamping device for welding copper tubes for heat exchangers according to claim 8, characterized in that: The inner wall of the anti-slip strip (a26) is movably attached to the outer surface of the copper tube (a4), the outer surface of the extrusion strip (a25) is movably sleeved inside the lower copper tube limiting groove (a2), the two sides of the extrusion strip (a25) are symmetrically fixedly connected to limiting blocks (a27), and the two sides of the lower copper tube limiting groove (a2) are provided with limiting grooves (a22) at positions opposite to the limiting blocks (a27).

10. A positioning and clamping device for welding copper tubes for heat exchangers according to claim 1, characterized in that: A fixed arm (12) is fixedly installed on the bottom surface of the hydraulic cylinder (121), and the outer surface of the fixed arm (12) is fixedly connected to the outer surface of the copper pipe welding table (11).

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