Copper pipe welding machine

Abstract

The invention provides a copper pipe welding machine, and particularly relates to the technical field of welding machines, the copper pipe welding machine comprises a welding table, a placing frame is fixedly arranged on one side of the top surface of the welding table, a plasma arc welding gun is connected to the placing frame in a clamped mode, and square blocks are slidably connected into four vertical grooves correspondingly; clamping blocks are fixedly arranged at the ends, away from the gear ring, of the four square blocks correspondingly, two copper pipes can be automatically clamped and fixed through the two fixed rings and the four clamping blocks arranged on the two fixed rings, so that the coaxiality and stability of the two copper pipes are guaranteed, stable welding of the two copper pipes is facilitated, the welding effect is improved, and the welding efficiency is improved. And in the process, manual clamping is not needed, automatic clamping can be achieved only by starting a small motor through a controller, so that the clamping convenience of the two copper pipes is improved, the moving distance of the four clamping blocks can be automatically adjusted through the rotating angle of an output shaft of the small motor, and the clamping efficiency is improved. And the copper pipe clamp is better suitable for clamping copper pipes with different sizes.

Description

Technical Field

[0001] The invention provides a copper tube welding machine, and particularly relates to the technical field of welding machines. Background Art

[0002] At present, plasma arc welding machines are usually used for copper pipe welding. Plasma arc welding is a method of welding using a high-energy-density plasma arc. It uses a plasma arc with a high temperature of tens of thousands of degrees Celsius generated by a specially constructed plasma arc torch to effectively melt the weldment and achieve copper pipe welding.

[0003] A copper tube welding device is disclosed in the utility model with authorization announcement number CN220881232U. The welding device extends into the tube mouth of the copper tube through a conical column until the tube mouth of the copper tube is stretched open. By manually turning the direction of the connecting block, another copper tube can be sleeved on the fixed column. The moving block can make the copper tube with the stretched tube mouth sleeve on the copper tube on the fixed column during movement. After the positions of the two copper tubes are fixed, the staff can weld the copper tubes more conveniently, and the operation is simpler and more convenient.

[0004] However, there are still some shortcomings when using the above copper tube welding device: the welding device cannot effectively position the copper tube. Although an arc plate and a cover plate are provided to clamp and fix a copper tube, the fixing method requires manual opening of the arc plate first and then fixing it with bolts to the cover plate. This process is not only cumbersome to operate, but also cannot flexibly adapt to copper tubes of different sizes. The applicability and positioning effect of clamping and fixing the copper tube are poor. Moreover, when the welding device fixes another copper tube, it only uses a sleeve connection method to fix it. The sleeve connection process not only requires manual operation, but also has poor stability. When the ports of the two copper tubes are subsequently connected, it is easy to cause the port parts of the two copper tubes to be misaligned, and it is impossible to achieve a good positioning and clamping effect on the two copper tubes, which will affect the restraint and fixing effect when the two copper tubes are welded.

[0005] Therefore, the present invention provides a copper tube welding machine to make up for and improve the deficiencies of the prior art. Summary of the invention

[0006] In view of the defects existing in the prior art, the present invention provides a copper tube welding machine, which can effectively solve the relevant technical problems raised by the background technology.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: The invention discloses a copper tube welding machine, comprising a welding table, a placing frame is fixedly arranged on one side of the top surface of the welding table, a plasma arc welding gun is clamped on the placing frame, a positioning tube clamping mechanism is arranged on the upper surface of the welding table, the positioning tube clamping mechanism comprises two groove frame plates fixedly connected to the top surface of the welding table, a rectangular frame is slidably connected to the two groove frame plates, a fixed ring is fixedly connected to the two rectangular frames, a small motor is fixedly installed on the top of the two fixed rings, a small gear is fixedly connected to the output shafts of the two small motors, a gear ring is rotatably connected to the two fixed rings on the sides away from each other, and the two fixed rings are rotatably connected to the gear ring. The fixed ring and the two gear rings are coaxially arranged, and the two gear rings are meshed with corresponding pinions. Four vertical grooves are evenly arranged on the two fixed rings, and the four vertical grooves are distributed in a cross shape. Square blocks are respectively slidably connected in the four vertical grooves, and clamping blocks are fixedly arranged at one end of the four square blocks away from the gear rings. Four arc grooves are evenly arranged on the two gear rings, and sliding rods are respectively slidably connected in the four arc grooves. The positions of the four sliding rods correspond to the positions of the four square blocks, and each sliding rod is fixedly connected to the corresponding square block. An I-plate is arranged on the side where the two fixed rings are close to each other.

[0008] Preferably, the four clamping blocks are each provided with an arc surface on one side away from the square block, and a rubber anti-slip layer is provided on the arc surface.

[0009] Preferably, the I-plate is located on the axial center lines of the two fixed rings and the two gear rings.

[0010] Preferably, a cotton cloth layer is provided on one side surface of the I-shaped plate close to the two fixed rings.

[0011] Preferably, an active pipe alignment mechanism is provided on the upper surface of the welding table and on one side close to the I-plate, and the active pipe alignment mechanism includes a center swing plate rotatably connected to the upper surface of the welding table, the center swing plate is located directly below the I-plate, a center gear is fixedly provided at the center of the top surface of the center swing plate, two ends of the center swing plate away from the center gear are respectively rotatably connected to connecting rods, and the ends of the two connecting rods away from the center swing plate are respectively rotatably connected to the bottom of adjacent rectangular frames, a rack is fixedly connected to the bottom of the I-plate, an electric-controlled telescopic rod is fixedly installed on the upper surface of the welding table, the top of the I-plate is fixed on the telescopic end of the electric-controlled telescopic rod, and the center gear is located on the horizontal movement path of the rack.

[0012] Preferably, the telescopic end of the electrically-controlled telescopic rod is initially in an extended state, and the I-shaped plate is always in a horizontal state.

[0013] Preferably, after the telescopic end of the electrically-controlled telescopic rod is retracted to a final position, the rack is always engaged with the central gear.

[0014] Preferably, the active pipe alignment mechanism also includes a collecting component, which includes a suction pump fixedly mounted on the upper surface of the welding table, a collecting pipe is connected to the suction end of the suction pump, and two open cavity panels are connected to the end of the collection tube away from the suction pump, and the positions of the two open cavity panels correspond to the positions of the cotton cloth layers on both sides of the I-shaped plate, a push rod is fixedly mounted on the top of the I-shaped plate, and a push switch is fixedly mounted on the top of the side of the electric telescopic rod away from the telescopic end thereof, and the push switch is located on the path of horizontal movement of the push rod.

[0015] Preferably, a side of the open cavity panel close to the cotton cloth layer is designed to be open, and the open portion is flush with the outer surface of the cotton cloth layer.

[0016] Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects: The copper tube welding machine can automatically clamp and fix the two copper tubes respectively by using two fixed rings and four clamping blocks arranged on the two fixed rings, so as to ensure the coaxiality and stability of the two copper tubes, thereby facilitating stable welding of the two copper tubes and improving the welding effect. In addition, no manual clamping is required during the process. Only a small motor can be started by a controller to realize automatic clamping and positioning of the two copper tubes, thereby improving the convenience of clamping the two copper tubes. In addition, the four clamping blocks can automatically adjust the moving distance of the four clamping blocks by the rotation angle of the output shaft of the small motor, so as to be more suitable for clamping copper tubes of different sizes. The I-shaped plate can ensure that the positions of the two copper tubes clamped by the four clamping blocks are at the same horizontal distance from the I-shaped plates, that is, the distance between the clamping position of the two copper tubes and the welding position after the final butt joint is the same, so that not only can the clamping position of the two copper tubes be quickly located to ensure the consistency of the clamping position of the two copper tubes, but also it is convenient for the subsequent butt joint of the two copper tubes; When the I-shaped plate is horizontally displaced between the two fixed rings, the ends of the two copper tubes are in contact with the cotton cloth layer, so as to wipe off the dust and impurities attached to the ends of the two copper tubes with the cotton cloth layer, so as to avoid the dust and impurities affecting the welding quality of the two copper tubes; After the two copper tubes are clamped and fixed, the two fixed rings are automatically driven to approach each other horizontally by the cooperation of the electric control telescopic rod, the center swing plate and other components, that is, the end parts of the two copper tubes are automatically docked, without manual docking, which improves the efficiency of docking copper tubes. At the same time, after the two copper tubes are docked, the electric control telescopic rod, the rack and the center gear are used to cooperate to keep the two copper tubes in a stable docking state, thereby improving the stability of the weld when the two copper tubes are welded, and further improving the welding quality of the copper tubes; By utilizing the suction force provided by the suction pump, the dust and impurities adsorbed on the surface of the cotton cloth layer can be automatically collected through two open cavity plates to reduce the amount of dust and impurities adhering to the outer surface of the cotton cloth layer, thereby ensuring the wiping and adsorption effect of the cotton cloth layer, which is suitable for the wiping treatment before welding of batch copper tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a main perspective structural diagram of the present invention; Figure 2 Another perspective three-dimensional structural diagram of the present invention; Figure 3 It is a partial three-dimensional structural diagram of the fixed ring and the gear ring related parts of the present invention; Figure 4 It is a partial three-dimensional structural diagram of the gear ring and the pinion gear related parts of the present invention; Figure 5 It is an exploded three-dimensional structural diagram of the fixed ring and the gear ring related parts of the present invention; Figure 6 It is a partial three-dimensional structural diagram of the relevant components of the clamping block of the present invention; Figure 7 It is a partial three-dimensional structural diagram of the central swing plate and the related parts of the electric control telescopic rod of the present invention; Figure 8 It is a partial three-dimensional structural diagram of the relevant components at the center swing plate of the present invention; Fig. 9 It is a partial three-dimensional structural diagram of the relevant components when the telescopic end of the electric-controlled telescopic rod of the present invention is in a retracted state.

[0018] The numbers in the figure represent: 1. Welding table; 11. Placement rack; 12. Plasma arc welding gun; Positioning and clamping tube mechanism: 21, slot frame plate; 22, rectangular frame; 23, fixed ring; 231, vertical slot; 232, square block; 233, clamping block; 24, gear ring; 241, arc slot; 242, slide bar; 25, small motor; 26, small gear; 27, I-shaped plate; 271, cotton cloth layer; Active pipe alignment mechanism: 31, center swing plate; 32, connecting rod; 33, rack; 34, center gear; 35, electric control telescopic rod; Collection components: 36, push rod; 37, push switch; 38, suction pump; 39, collection tube; 310, open cavity panel. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the embodiments.

[0020] Embodiment 1: Figures 1 to 6As shown, a copper tube welding machine includes a welding table 1, a placement rack 11 is fixedly provided on one side of the top surface of the welding table 1, a plasma arc welding gun 12 is clamped on the placement rack 11, and the plasma arc welding gun 12 can be connected to an external gas supply device in the prior art. A positioning tube clamping mechanism is provided on the upper surface of the welding table 1, and the positioning tube clamping mechanism includes two groove frame plates 21 fixedly connected to the top surface of the welding table 1, a rectangular frame 22 is slidably connected to each of the two groove frame plates 21, and a fixed ring 23 is fixedly connected to each of the two rectangular frames 22, and a small motor 25 is fixedly installed on the top of each of the two fixed rings 23, and a pinion 26 is fixedly connected to the output shaft of each of the two small motors 25, and a gear ring 24 is rotatably connected to the two fixed rings 23 on the side away from each other, and the two fixed rings 23 and the two gear rings 24 are coaxially arranged, and the two gear rings 24 are connected to the corresponding pinion 26. The two fixed rings 23 are meshed with each other, and four vertical grooves 231 are evenly opened on the two fixed rings 23. The four vertical grooves 231 are distributed in a cross shape. Square blocks 232 are slidably connected in the four vertical grooves 231 respectively. A clamping block 233 is fixedly set at one end of the four square blocks 232 away from the gear ring 24. There are four clamping blocks 233 in total. The four clamping blocks 233 are provided with an arc surface on one side away from the square block 232, and a rubber anti-skid layer is provided on the arc surface. The arc surface of the clamping block 233 is better in contact with the outer wall of the copper tube, and the rubber anti-skid layer can increase the friction when clamping the copper tube and reduce the damage to the outer surface of the copper tube. Four arc grooves 241 are evenly opened on the two gear rings 24, and sliding rods 242 are slidably connected in the four arc grooves 241 respectively. The positions of the four sliding rods 242 correspond to the positions of the four square blocks 232, and each sliding rod 242 is fixedly connected to the corresponding square block 232. An I-plate 27 is provided on the side where the two fixed rings 23 are close to each other. The I-plate 27 is located on the axis of the two fixed rings 23 and the two gear rings 24. Cotton cloth layers 271 are provided on the surface of one side of the I-plate 27 close to the two fixed rings 23. The cotton cloth layer 271 is absorbent cotton, which has good adsorption properties and can better wipe and adsorb dust and impurities. The cotton cloth layer 271 is attached to the surface of one side of the I-plate 27 close to the fixed ring 23 through Velcro for manual replacement by users.

[0021] As mentioned above, the two small motors 25 are both controlled by an external controller, and the output shafts of the two small motors 25 can be controlled to rotate forward and reverse by the external controller.

[0022] When in use: the staff takes two copper tubes to be welded, and the end of one of the copper tubes has been expanded in advance. Then, the staff uses the position of the I-shaped plate 27 as a reference, holds a copper tube and passes it horizontally through the gear ring 24 and the fixed ring 23 until one end of the copper tube touches the outer surface of the cotton cloth layer 271 on the I-shaped plate 27, and then starts the corresponding small motor 25 through the controller, and the output shaft of the small motor 25 drives the pinion 26 to rotate forward, and then drives the gear ring 24 to rotate in the opposite direction through the pinion 26. As the gear ring 24 rotates in the opposite direction, it drives the four arc grooves 241 to rotate synchronously, causing the four arc grooves 241 to squeeze the corresponding slide bars 242 respectively, and the four vertical grooves 231 and the four square blocks 232 cooperate in sliding. The four square blocks 232 are respectively moved along the tracks of the corresponding vertical grooves 231, and at the same time, they are displaced in the direction close to the center of the fixed ring 23, thereby causing the four clamping blocks 233 to gradually move in the direction of the center of the fixed ring 23, that is, the four clamping blocks 233 are simultaneously close to the outer wall of the copper tube, until the arc surfaces of the four clamping blocks 233 contact and clamp the outer surface of the copper tube, and then the small motor 25 is turned off by the controller, and as the small motor 25 is turned off, its output shaft cannot rotate freely, that is, the gear ring 24 cannot rotate, and at this time, the four clamping blocks 233 will be kept in the current state of clamping the copper tube. Similarly, according to the above steps, the four clamping blocks 233 on the other side are used to clamp and fix another copper tube. Therefore, by using two fixed rings 23 and four clamping blocks 233 arranged on the two fixed rings 23, the two copper tubes can be automatically clamped and fixed respectively to ensure the coaxiality and stability of the two copper tubes, thereby facilitating the stable welding of the two copper tubes and improving the welding effect. In addition, no manual clamping is required during the process, and automatic clamping can be achieved by simply starting the small motor 25 through the controller, thereby improving the convenience of clamping the two copper tubes. Moreover, the four clamping blocks 233 can automatically adjust the moving distance of the four clamping blocks 233 through the rotation angle of the output shaft of the small motor 25, so as to be more suitable for clamping copper tubes of different sizes.

[0023] In the above process, the I-shaped plate 27 can be used to ensure that the positions of the two copper tubes clamped by the four clamping blocks 233 are at the same horizontal distance from the I-shaped plate 27, that is, the distance between the clamping position of the two copper tubes and the welding position after the final docking is the same. This not only can quickly locate the clamping position of the two copper tubes and ensure the consistency of the clamping position of the two copper tubes, but also facilitates the subsequent docking of the two copper tubes.

[0024] Embodiment 2: Figure 1 , Figure 7 , Figure 8As shown, the above-mentioned copper tube welding machine also includes an active tube alignment mechanism arranged on the upper surface of the welding table 1 and close to one side of the I-plate 27, the active tube alignment mechanism includes a center swing plate 31 rotatably connected to the upper surface of the welding table 1, the center swing plate 31 is located directly below the I-plate 27, a center gear 34 is fixedly arranged at the center of the top surface of the center swing plate 31, two ends of the center swing plate 31 away from the center gear 34 are respectively rotatably connected to connecting rods 32, one end of the two connecting rods 32 away from the center swing plate 31 is respectively rotatably connected to the bottom of the adjacent rectangular frame 22, a rack 33 is fixedly connected to the bottom of the I-plate 27, an electric-controlled telescopic rod 35 is fixedly installed on the upper surface of the welding table 1, the top of the I-plate 27 is fixed on the telescopic end of the electric-controlled telescopic rod 35, the telescopic end of the electric-controlled telescopic rod 35 is initially in an extended state, and the I-plate 27 is always in a horizontal state. The central gear 34 is located on the horizontal movement path of the rack 33. After the telescopic end of the electric telescopic rod 35 is retracted to the final position, the rack 33 is always meshed with the central gear 34. Specifically, a plurality of teeth meshing with the central gear 34 are evenly arranged on the side of the rack 33 away from the central gear 34. That is to say, only when the telescopic end of the electric telescopic rod 35 is retracted, and these teeth are driven to move to the position of the central gear 34, will they be meshed with the central gear 34 for transmission. At this time, the telescopic end of the electric telescopic rod 35 has driven the I-shaped plate 27 to move and move away from the two fixed rings 23.

[0025] The above-mentioned electric control telescopic rod 35 is also controlled by the above-mentioned external controller, and its telescopic end can be controlled to be horizontally retracted and horizontally extended through the controller.

[0026] When in use: After the two copper tubes are clamped and fixed, the staff then starts the electric telescopic rod 35 through the controller, prompting the telescopic end of the electric telescopic rod 35 to be retracted, so as to drive the I-shaped plate 27 to move horizontally synchronously. When the telescopic end of the electric telescopic rod 35 is retracted by half, the I-shaped plate 27 is completely away from the two fixed rings 23. When the I-shaped plate 27 moves horizontally between the two fixed rings 23, the ends of the two copper tubes are in contact with the cotton layer 271, so that as the cotton layer 271 moves horizontally, the cotton layer 271 will be used to wipe off the dust and impurities attached to the ends of the two copper tubes, so as to prevent the dust and impurities from affecting the welding quality of the two copper tubes.

[0027] At the same time, when the telescopic end of the electric telescopic rod 35 drives the I-shaped plate 27 to continue to retract the remaining half, the teeth on the rack 33 will be meshed with the central gear 34, and the central gear 34 will be driven to rotate, and the central swing plate 31 will be driven to rotate synchronously through the rotation of the central gear 34. As the central swing plate 31 rotates, the connecting rods 32 on both sides will be driven to rotate. Since the two fixed rings 23 slide inside the groove frame plate 21 through the rectangular frame 22, as the connecting rod 32 rotates, the two fixed rings 23 will be pulled along the groove frame. The tracks of the plates 21 approach horizontally, thereby driving the two copper tubes clamped and fixed on the two fixed rings 23 to automatically approach each other, and when the telescopic end of the electric telescopic rod 35 is retracted to the final position, the two fixed rings 23 drive the ports of the two copper tubes to dock, and the telescopic end of the electric telescopic rod 35 remains in the current state, and the teeth on the rack 33 are still engaged with the central gear 34, so that the central swing plate 31 cannot rotate, that is, after the two fixed rings 23 drive the two copper tubes to dock, they will stably remain in the current state. Then the staff can remove the plasma arc welding gun 12 from the placement rack 11, and use the plasma arc welding gun 12 to align the docking parts of the two copper tubes for welding.

[0028] Therefore, after the two copper tubes are clamped and fixed, the two fixed rings 23 are automatically driven to approach each other horizontally by the cooperation of the electrically-controlled telescopic rod 35, the center swing plate 31 and other components, that is, the end parts of the two copper tubes are prompted to achieve the effect of automatic docking, without the need for manual docking, thereby improving the efficiency of docking the copper tubes. At the same time, after the two copper tubes are docked, the electrically-controlled telescopic rod 35, the rack 33 and the center gear 34 are used to cooperate to ensure that the two copper tubes always maintain a stable docking state, thereby improving the stability of the weld when the two copper tubes are welded, and further improving the welding quality of the copper tubes.

[0029] Embodiment 3: Figure 7 , Fig. 9As shown, the active pipe alignment mechanism further includes a collection assembly, which includes a suction pump 38 fixedly mounted on the upper surface of the welding table 1, and a collection pipe 39 is connected to the suction end of the suction pump 38. A solenoid valve is provided at the connection portion between the suction pump 38 and the collection pipe 39, and the solenoid valve is initially in a closed state; in addition, the discharge end of the suction pump 38 can be connected to an external collection container, such as a dust bag. Two open cavities 310 are connected to one end of the collection pipe 39 away from the suction pump 38, and the positions of the two open cavities 310 correspond to the positions of the cotton cloth layers 271 on both sides of the I-shaped plate 27, that is, when the telescopic end of the electric control telescopic rod 35 is retracted to the end, the surface of one side of the cotton cloth layer 271 close to the open cavities 310 corresponds to the position of the open cavities 310. The side of the open cavities 310 close to the cotton cloth layer 271 is set to be open, and the open portion is flush with the outer surface of the cotton cloth layer 271. A push rod 36 is fixedly provided on the top of the I-shaped plate 27, and a push switch 37 is fixedly installed on the top of the side of the electric control telescopic rod 35 away from the telescopic end thereof. The push switch 37 is located on the horizontal movement path of the push rod 36. Specifically, when the telescopic end of the electric control telescopic rod 35 is retracted and drives the I-shaped plate 27 to move to the final position, the push rod 36 just hits the push switch 37, and the push switch 37 can control the suction pump 38 to start and control the solenoid valve to open automatically. When the push rod 36 is away from the push switch 37, the push switch 37 controls the suction pump 38 to close.

[0030] During use: In addition, considering that dust and impurities will adhere to the surface of the copper tube after the cotton layer 271 wipes the port, in order to ensure the effectiveness of the cotton layer 271 in wiping and absorbing dust and impurities during the subsequent copper tube welding. When the telescopic end of the electric telescopic rod 35 is retracted to the final position, it will also drive the push rod 36 to move synchronously, and after the telescopic end of the electric telescopic rod 35 is retracted to the final position, the push rod 36 will trigger the push switch 37, thereby starting the suction pump 38 through the push switch 37. After the suction pump 38 is started, a continuous suction force is formed at the open cavity 310 through the collection pipe 39, and at this time, the cotton layer 271 just corresponds to the position of the two open cavity panels 310, and the open part of the open cavity panel 310 is flush with the outer surface of the cotton layer 271, so that dust and impurities are collected into the external collection container. Therefore, by utilizing the suction force provided by the suction pump 38, the dust and impurities adsorbed on the surface of the cotton cloth layer 271 can be automatically collected through the two open cavity panels 310 to reduce the amount of dust and impurities adhering to the outer surface of the cotton cloth layer 271, thereby ensuring the wiping and adsorption effect of the cotton cloth layer 271, which is suitable for wiping treatment before batch copper pipe welding.

[0031] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A copper tube welding machine, comprising a welding table (1), a placement frame (11) being fixedly arranged on one side of the top surface of the welding table (1), a plasma arc welding gun (12) being clamped on the placement frame (11), characterized in that: The upper surface of the welding table (1) is provided with a positioning pipe clamping mechanism, which comprises two groove frame plates (21) fixedly connected to the top surface of the welding table (1), the two groove frame plates (21) are slidably connected to a rectangular frame (22), the two rectangular frames (22) are fixedly connected to a fixed ring (23), the tops of the two fixed rings (23) are fixedly mounted with a small motor (25), the output shafts of the two small motors (25) are fixedly connected to a small gear (26), the two fixed rings (23) are rotatably connected to a gear ring (24) on the sides away from each other, the two fixed rings (23) and the two gear rings (24) are coaxially arranged, the two gear rings (24) are meshed with the corresponding small gears (26), and the two fixed rings (23) are coaxially arranged to the two fixed rings (23) and the two gear rings (24) are meshed with each other. Four vertical grooves (231) are evenly formed on each of the fixed rings (23), and the four vertical grooves (231) are distributed in a cross shape. A square block (232) is slidably connected in each of the four vertical grooves (231). A clamping block (233) is fixedly provided at one end of each of the four square blocks (232) away from the gear ring (24). Four arc grooves (241) are evenly formed on each of the two gear rings (24), and a sliding rod (242) is slidably connected in each of the four arc grooves (241). The positions of the four sliding rods (242) correspond to the positions of the four square blocks (232), and each sliding rod (242) is fixedly connected to the corresponding square block (232). An I-shaped plate (27) is provided on the side of the two fixed rings (23) close to each other.

2. The copper tube welding machine according to claim 1, characterized in that: The four clamping blocks (233) are each provided with an arc surface on one side away from the square block (232), and a rubber anti-slip layer is provided on the arc surface.

3. The copper tube welding machine according to claim 1, characterized in that: The I-shaped plate (27) is located on the axis lines of the two fixed rings (23) and the two gear rings (24).

4. The copper tube welding machine according to claim 3, characterized in that: A cotton cloth layer (271) is provided on one side surface of the I-shaped plate (27) close to the two fixed rings (23).

5. The copper tube welding machine according to claim 1, characterized in that: An active pipe alignment mechanism is provided on the upper surface of the welding table (1) and on one side close to the I-shaped plate (27). The active pipe alignment mechanism comprises a central swing plate (31) rotatably connected to the upper surface of the welding table (1). The central swing plate (31) is located directly below the I-shaped plate (27). A central gear (34) is fixedly provided at the center of the top surface of the central swing plate (31). Two ends of the central swing plate (31) away from the central gear (34) are rotatably connected to connecting rods (32). One end of the two connecting rods (32) away from the central swing plate (31) is rotatably connected to the bottom of adjacent rectangular frames (22). A rack (33) is fixedly connected to the bottom of the I-shaped plate (27). An electric-controlled telescopic rod (35) is fixedly installed on the upper surface of the welding table (1). The top of the I-shaped plate (27) is fixed to the telescopic end of the electric-controlled telescopic rod (35). The central gear (34) is located on the horizontal movement path of the rack (33).

6. The copper tube welding machine according to claim 5, characterized in that: The telescopic end of the electrically controlled telescopic rod (35) is initially in an extended state, and the I-shaped plate (27) is always in a horizontal state.

7. The copper tube welding machine according to claim 5, characterized in that: After the telescopic end of the electrically controlled telescopic rod (35) is retracted to the final position, the rack (33) is always in mesh with the central gear (34).

8. The copper tube welding machine according to claim 5, characterized in that: The active pipe alignment mechanism further comprises a collecting assembly, the collecting assembly comprising a suction pump (38) fixedly mounted on the upper surface of the welding table (1); a collecting pipe (39) is connected to the suction end of the suction pump (38); two open cavity panels (310) are connected to one end of the collecting pipe (39) away from the suction pump (38); positions of the two open cavity panels (310) correspond to positions of the cotton cloth layers (271) on both sides of the I-shaped plate (27); a push rod (36) is fixedly mounted on the top of the I-shaped plate (27); a push switch (37) is fixedly mounted on the top of the side of the electric control telescopic rod (35) away from the telescopic end thereof; the push switch (37) is located on the path of horizontal movement of the push rod (36).

9. The copper tube welding machine according to claim 8, characterized in that: The side of the open cavity panel (310) close to the cotton cloth layer (271) is designed to be open, and the open portion is flush with the outer surface of the cotton cloth layer (271).

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