A spot welding device for manufacturing electronic components

Abstract

The present invention provides a spot welding device for manufacturing electronic components, which relates to the technical field of welding equipment, including a welding box, wherein a box door is arranged on the welding box, air inlet pipes are installed on both side walls of the welding box, a purification box is fixedly installed on the upper end of the welding box, an exhaust pipe is installed inside the purification box, the lower end of the exhaust pipe is arranged in the welding box, a suction pump is fixedly installed inside the purification box, the air inlet end of the suction pump is connected with the exhaust pipe, an activated carbon adsorption plate is installed on the upper end of the purification box, the air outlet end of the suction pump is located below the activated carbon adsorption plate, a control panel is installed on the side wall of the purification box, a manipulator is fixedly installed in the inner wall of the welding box, and a clamping mechanism includes a U-shaped frame, and two U-shaped frames are symmetrically installed on the inner wall of the welding box. Through a unique multi-directional clamping design, the device is suitable for electronic components of any specifications, and the two sides and two ends of the electronic components are synchronously fixed, so as to effectively prevent displacement and shaking during welding and reduce the occurrence rate of welding defects.

Description

Technical Field

[0001] The invention belongs to the technical field of welding equipment, and more specifically, particularly relates to a spot welding device used for manufacturing electronic components. Background Art

[0002] Spot welding refers to a welding method that uses a cylindrical electrode to form a weld between the contact surfaces of two overlapping workpieces. During spot welding, pressure is first applied to make the workpieces in close contact, and then current is turned on. The contact between the workpieces melts under the action of resistance heat, and a weld is formed after cooling.

[0003] However, the existing spot welding devices for electronic components manufacturing still have the following shortcomings when used:

[0004] 1. Existing spot welding equipment often cannot achieve multi-directional and stable clamping when clamping electronic components. Especially for electronic components of different specifications, the adaptability is insufficient, which leads to displacement and shaking during the welding process, increasing the risk of welding defects;

[0005] 2. Most of the existing spot welding equipment does not have the function of autonomous uniform speed flipping. During the welding process, when one side of the workpiece is welded and the other side needs to be welded, the equipment has to be stopped to perform manual flipping operations. This frequent shutdown operation is not only cumbersome and time-consuming, but also seriously disrupts the continuity and fluency of the welding work.

[0006] In view of the existing structure and defects, improvements are made to provide a spot welding device for the manufacture of electronic components. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides a spot welding device for manufacturing electronic components to solve the above problems.

[0008] A spot welding device for manufacturing electronic components, comprising a welding box, a box door is provided on the welding box, air inlet pipes are installed on both side walls of the welding box, a purification box is fixedly installed on the upper end of the welding box, an air extraction pipe is installed inside the purification box, the lower end of the air extraction pipe is arranged in the welding box, a suction pump is fixedly installed inside the purification box, the air inlet end of the suction pump is connected to the air extraction pipe, an activated carbon adsorption plate is installed on the upper end of the purification box, the air outlet end of the suction pump is located below the activated carbon adsorption plate, a control panel is installed on the side wall of the purification box, a manipulator is fixedly installed in the inner wall of the welding box, and a welding gun head is installed on the manipulator;

[0009] A clamping mechanism is symmetrically fixedly installed in the inner side wall of the welding box;

[0010] The clamping mechanism comprises a U-shaped frame, wherein two U-shaped frames are symmetrically mounted on the inner side wall of the welding box, and rotating columns are rotatably mounted inside the two U-shaped frames, and first gear rings are fixedly sleeved on the two rotating columns.

[0011] Preferably, slots are provided on the opposite ends of the two rotating columns, first threaded rings are threadedly installed on the two rotating columns, plug posts are slidably installed inside the two slots, arc grooves are symmetrically provided on the two plug posts, and the two first threaded rings are respectively arranged in two groups of arc grooves.

[0012] Preferably, the two plug posts are both threadedly mounted with a second threaded ring, the two plug posts are symmetrically provided with inner grooves on opposite ends, the two inner grooves are both rotatably mounted with clamping strips, and the two groups of clamping strips are both provided with cross grooves.

[0013] Preferably, the two groups of clamps are fixedly mounted with a first spring, the ends of the two groups of the first springs away from the two groups of clamps are respectively fixedly mounted in the inner walls of the two groups of inner grooves, the two groups of cross grooves are slidably mounted with a cross block, and the two groups of cross blocks are fixedly mounted with a first screw.

[0014] Preferably, a third threaded ring is threadedly installed on both groups of the first screw rods, second springs are fixedly installed on both side walls of the two groups of the cross blocks, and a connecting ring is fixedly installed on one end of each second spring away from the cross block.

[0015] Preferably, the two groups of cross blocks are both fixedly installed with second screws, both ends of the two groups of second screws are threadedly installed with fourth threaded rings, and the two groups of second screws are both slidably installed with sliding bars.

[0016] Preferably, each of the slide bars is provided with a limiting groove, a clamping plate is provided between each group of the slide bars, limiting blocks are symmetrically fixedly installed on the side walls of the two groups of clamping plates, and each of the limiting blocks is slidably installed in each limiting groove.

[0017] Preferably, third springs are fixedly mounted on both upper and lower ends of the two groups of clamps, and one end of each of the third springs away from the clamp is fixedly connected to each slide bar.

[0018] Preferably, a double-headed motor is fixedly installed inside the welding box, driving shafts are installed at both ends of the double-headed motor, and second gear rings are fixedly installed on both driving shafts.

[0019] Preferably, the two second gear rings and the two first gear rings are meshed with internal toothed belts, a top plate is fixedly mounted on the upper end of the double-headed motor, mounting grooves are opened at the four corners of the top plate, and a collection box is inserted into the mounting groove.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] In the present invention, a plug post, a second threaded ring, a clamping strip, a cross block, a second screw rod, a fourth threaded ring, a sliding strip and a clamping plate are provided. When the two second threaded rings are rotated, the two second threaded rings will move toward the middle on the plug post. At this time, the two second threaded rings will squeeze the two groups of clamping strips, and the free ends of the two groups of clamping strips will move toward the middle. At the same time, the two groups of first springs will also be compressed accordingly. When the two groups of clamping strips are flipped, the two groups of cross blocks will be driven to flip accordingly. At this time, the two groups of cross blocks will complete the clamping and fixing of the two ends of the electronic component. Then, the two ends of the sliding strip can be respectively sleeved on the two ends of the second screw rod, and then the fourth threaded ring can be installed on the two ends of the second screw rod to complete the fixing of the sliding strip. At this time, the two groups of clamping plates will synchronously fix the two sides of the two electronic components. The unique multi-directional clamping design makes the device suitable for electronic components of any specifications, and synchronously fixes the two sides and two ends of the electronic components, effectively preventing displacement and shaking during welding, and reducing the incidence of welding defects.

[0022] In the present invention, by providing a rotating column, a first threaded ring, an insertion column and an arc groove, the two first threaded rings are rotated on the two rotating columns. Since the two first threaded rings are also synchronously limited in the two groups of arc grooves, the rotation of the two first threaded rings will drive the two insertion columns to move toward the middle of the device, and the movement of the two insertion columns will drive the two electronic components to move toward the middle of the device, so that the weld positions of the two electronic components can be pressed tightly. The device is convenient for fine-tuning the positions of the electronic components, effectively avoiding welding defects caused by inaccurate weld positions, reducing the defective rate, reducing the errors caused by position changes, and improving the consistency of welding effects;

[0023] In the present invention, by providing a control panel, a rotating column, a first gear ring, a plug column, a double-headed motor, a driving shaft, a second gear ring and an inner gear belt, the double-headed motor can be started by controlling the control panel during spot welding, and the two driving shafts will rotate synchronously, the two driving shafts will drive the two second gear rings to rotate, and the two second gear rings will drive the two inner gear belts to transmit, the two inner gear belts will synchronously drive the two first gear rings and the rotating column to rotate, and the two rotating columns will drive the two plug columns to rotate, and the two plug columns will drive the two electronic components to rotate synchronously, so that the equipment can ensure that the solder joints are evenly distributed on the electronic components during welding, thereby improving the quality and stability of welding;

[0024] In the present invention, a welding box, an air intake pipe, a purification box, an air extraction pipe, a suction pump and an activated carbon adsorption plate are provided. Under the action of the suction pump, external air is sucked into the welding box through the air intake pipe, and then the smoke generated by welding is sucked out from the inside of the welding box. The smoke enters the purification box through the air extraction pipe, and then is discharged after being filtered by the activated carbon adsorption plate. The suction action of the suction pump forms a good air flow circulation, improves the air quality of the working environment, helps to reduce the temperature of the welding area, and prolongs the service life of the equipment.

[0025] In the present invention, by providing a welding gun head, a mounting groove and a collection box, when welding slag is generated during the spot welding process, the welding slag will fall into the collection box for collection under the action of gravity or by contact with the welding gun head, so that the device can be used to simultaneously collect the generated welding slag or impurities. By designing the collection box to be inserted into the mounting groove, the process of removing and cleaning the welding slag is also simpler and more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the box door opening state of the present invention;

[0028] Figure 3 It is a schematic diagram of the suction pump connection explosion structure of the present invention;

[0029] Figure 4 This is a schematic diagram of the explosion structure of the inner toothed belt connection of the present invention;

[0030] Figure 5 It is a schematic diagram of the explosion structure of the collection box connection of the present invention;

[0031] Figure 6 This is a schematic diagram of the explosion structure of the plug-in column connection of the present invention;

[0032] Figure 7 This is a schematic diagram of the cross block connection explosion structure of the present invention;

[0033] Figure 8 It is a schematic diagram of the splint connection explosion structure of the present invention.

[0034] In the figure, the corresponding relationship between the structure names and the reference numerals is: 11, welding box; 12, box door; 13, air inlet pipe; 14, purification box; 15, exhaust pipe; 16, suction pump; 17, activated carbon adsorption plate; 18, control panel; 21, manipulator; 22, welding gun head; 23, U-shaped frame; 24, rotating column; 25, first gear ring; 26, slot; 27, first threaded ring; 28, plug column; 29, arc groove; 31, second threaded ring; 32, inner groove; 33, Clamping strip; 34, cross slot; 35, first spring; 36, cross block; 37, first screw; 38, third threaded ring; 41, second spring; 42, connecting ring; 43, second screw; 44, fourth threaded ring; 45, sliding strip; 46, limiting groove; 47, clamping plate; 48, limiting block; 49, third spring; 51, double-headed motor; 52, driving shaft; 53, second gear ring; 54, inner toothed belt; 55, top plate; 56, mounting groove; 57, collection box. DETAILED DESCRIPTION

[0035] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] See also Figure 1-Figure 8 The present invention provides a spot welding device for manufacturing electronic components, including a welding box 11, a box door 12 is provided on the welding box 11, air inlet pipes 13 are installed on both side walls of the welding box 11, a purification box 14 is fixedly installed at the upper end of the welding box 11, an exhaust pipe 15 is installed inside the purification box 14, the lower end of the exhaust pipe 15 is arranged in the welding box 11, a suction pump 16 is fixedly installed inside the purification box 14, the air inlet end of the suction pump 16 is connected to the exhaust pipe 15, an activated carbon adsorption plate 17 is installed on the upper end of the purification box 14, the air outlet end of the suction pump 16 is located below the activated carbon adsorption plate 17, and a control panel is installed on the side wall of the purification box 14 18. A manipulator 21 is fixedly installed in the inner wall of the welding box 11, and a welding gun head 22 is installed on the manipulator 21. When welding starts, the suction pump 16 can be started through the control panel 18. Under the action of the suction pump 16, external air will be sucked into the welding box 11 through the air inlet pipe 13, and then the smoke generated by welding will be sucked out from the inside of the welding box 11. The smoke enters the purification box 14 through the exhaust pipe 15, and then is discharged after being filtered by the activated carbon adsorption plate 17. The suction action of the suction pump 16 forms a good airflow circulation, improves the air quality of the working environment, helps to reduce the temperature of the welding area, and prolongs the service life of the equipment;

[0037] A clamping mechanism is symmetrically fixedly installed in the inner wall of the welding box 11;

[0038] The clamping mechanism includes a U-shaped frame 23, and the two U-shaped frames 23 are symmetrically installed on the inner wall of the welding box 11. A rotating column 24 is rotatably installed inside the two U-shaped frames 23. A first toothed ring 25 is fixedly sleeved on the two rotating columns 24. A slot 26 is opened on the opposite ends of the two rotating columns 24. A first threaded ring 27 is threadedly installed on the two rotating columns 24. A plug-in column 28 is slidably installed inside the two slots 26. The two plug-in columns 28 are symmetrically provided with arc grooves 29. The two first threaded rings 27 are respectively arranged in two groups of arc grooves 29. When the electronic components are fixed, the two rotating columns 24 can be rotated at this time. The first threaded ring 27 is provided. Since the two first threaded rings 27 are also synchronously limited in the two groups of arc grooves 29, the rotation of the two first threaded rings 27 will drive the two plug posts 28 to move toward the middle of the device, and the movement of the two plug posts 28 will drive the two electronic components to move toward the middle of the device, so that the weld positions of the two electronic components can be pressed together. The device is convenient for fine-tuning the positions of the electronic components, effectively avoiding welding defects caused by inaccurate weld positions, reducing the defective rate, reducing the errors caused by position changes, and improving the consistency of welding effects;

[0039] The two plug posts 28 are both threadedly mounted with a second threaded ring 31, and the two plug posts 28 are symmetrically provided with inner grooves 32 at opposite ends, and the two inner grooves 32 are both rotatably provided with clamping strips 33, and the two groups of clamping strips 33 are both provided with cross grooves 34, and the two groups of clamping strips 33 are both fixedly mounted with first springs 35, and the ends of the two groups of first springs 35 away from the two groups of clamping strips 33 are respectively fixedly mounted on the inner walls of the two groups of inner grooves 32, and the two groups of cross grooves 34 are both slidably provided with cross blocks 36, and the two groups of cross blocks 36 are both fixedly mounted with first screws 37, and the two groups The first screw rod 37 is threadedly mounted with a third threaded ring 38, and the side walls of the two groups of cross blocks 36 are fixedly mounted with second springs 41, and the end of each second spring 41 away from the cross block 36 is fixedly mounted with a connecting ring 42, and the inside of the two groups of cross blocks 36 is fixedly mounted with a second screw rod 43, and both ends of the two groups of second screw rods 43 are threadedly mounted with a fourth threaded ring 44, and the two groups of second screw rods 43 are slidably mounted with a slide bar 45, and each slide bar 45 is provided with a limiting groove 46, and a clamping plate 47 is provided between each group of slide bars 45, and the use When the box door 12 is opened, the two electronic components to be welded are placed between the two groups of clamping plates 47 respectively. At this time, the two second threaded rings 31 are rotated on the two plug posts 28. Under the rotation of the two second threaded rings 31, they will move toward the middle of the plug posts 28. At this time, the two second threaded rings 31 will squeeze the two groups of clamping strips 33, and the free ends of the two groups of clamping strips 33 will move toward the middle. At the same time, the two groups of first springs 35 will also be compressed. The flipping of the two groups of clamping strips 33 will drive the two groups of cross blocks 36 to flip over. At this time, the two groups of cross blocks 36 will be turned over. The block 36 will complete the clamping and fixing of the two ends of the electronic components, and then the two ends of the slide bar 45 can be respectively sleeved on the two ends of the second screw rod 43, and then the fourth threaded ring 44 is installed on the two ends of the second screw rod 43 to complete the fixing of the slide bar 45. At this time, the two sets of clamping plates 47 will synchronously fix the two sides of the two electronic components. The unique multi-directional clamping design makes the device suitable for electronic components of any specifications, and synchronously fixes the two sides and two ends of the electronic components, effectively preventing displacement and shaking during welding, and reducing the incidence of welding defects;

[0040] Limiting blocks 48 are symmetrically fixedly installed on the side walls of the two groups of clamps 47, and each limiting block 48 is slidably installed in each limiting groove 46. Third springs 49 are fixedly installed on the upper and lower ends of the two groups of clamps 47, and one end of each third spring 49 away from the clamp 47 is fixedly connected to each slide bar 45. A double-headed motor 51 is fixedly installed inside the welding box 11, and driving shafts 52 are installed at both ends of the double-headed motor 51. Second gear rings 53 are fixedly installed on the two driving shafts 52, and the two second gear rings 53 are meshed with internal toothed belts 54 on the two first gear rings 25. When the welds of the two electronic components are aligned, the box door 12 can be closed, and the operation of the manipulator 21 can be controlled by the control panel 18, and then the spot welding of the two electronic components can be achieved through the welding gun head 22. During spot welding, the double-headed motor 51 can be started by controlling the control panel 18, and the two driving shafts 52 will rotate synchronously, and the two driving shafts 52 will drive the two second gear rings 53 to rotate synchronously. The two inner toothed belts 54 will drive the two first toothed rings 25 and the rotating column 24 to rotate, and the two rotating columns 24 will drive the two plug posts 28 to rotate, and the two plug posts 28 will drive the two electronic components to rotate synchronously, so that the equipment can ensure that the solder joints are evenly distributed on the electronic components during welding, thereby improving the quality and stability of welding. A top plate 55 is fixedly installed on the upper end of the double-headed motor 51, and mounting grooves 56 are provided at the four corners of the top plate 55. A collecting box 57 is inserted into the mounting groove 56. When welding slag is generated during spot welding, the welding slag will fall into the collecting box 57 for collection under the action of gravity or by contact with the welding gun head 22, so that the equipment is convenient for synchronously collecting the generated welding slag or impurities when in use, and by designing the collecting box 57 to be inserted into the mounting groove 56, the process of taking and cleaning the welding slag is also simpler and more convenient.

[0041] Working principle:

[0042] In the first step, when using, the box door 12 can be opened first, and then the two electronic components to be welded are placed between the two groups of clamping plates 47 respectively. At this time, the two second threaded rings 31 are rotated on the two plug posts 28. Under the rotation of the two second threaded rings 31, they will move toward the middle on the plug posts 28. At this time, the two second threaded rings 31 will squeeze the two groups of clamping strips 33, and the free ends of the two groups of clamping strips 33 will move toward the middle. At the same time, the two groups of first springs 35 will also be compressed. Under the flipping of the two groups of clamping strips 33, the two groups of cross blocks 36 will be flipped. At this time The two groups of cross blocks 36 will complete the clamping and fixing of the two ends of the electronic components, and then the two ends of the slide bar 45 can be respectively sleeved on the two ends of the second screw rod 43, and then the fourth threaded ring 44 is installed on the two ends of the second screw rod 43 to complete the fixing of the slide bar 45. At this time, the two groups of clamping plates 47 will synchronously fix the two sides of the two electronic components. The unique multi-directional clamping design makes the device suitable for electronic components of any specifications, and synchronously fixes the two sides and two ends of the electronic components, effectively preventing displacement and shaking during welding, and reducing the incidence of welding defects;

[0043] In the second step, after the electronic components are fixed, the two first threaded rings 27 can be rotated on the two rotating posts 24. Since the two first threaded rings 27 are also synchronously limited in the two sets of arc grooves 29, the rotation of the two first threaded rings 27 will drive the two plug posts 28 to move toward the middle of the device, and the movement of the two plug posts 28 will drive the two electronic components to move toward the middle of the device, so that the weld positions of the two electronic components can be pressed together. The device is convenient for fine-tuning the positions of the electronic components, effectively avoiding welding defects caused by inaccurate weld positions, reducing the defective rate, reducing the errors caused by position changes, and improving the consistency of welding effects;

[0044] The third step is that after the welds of the two electronic components are aligned, the box door 12 can be closed, the robot 21 can be controlled to operate through the control panel 18, and then the spot welding of the two electronic components can be realized through the welding gun head 22. During spot welding, the double-headed motor 51 can be controlled to start through the control panel 18, and the two drive shafts 52 will rotate synchronously, and the two drive shafts 52 will drive the two second gear rings 53 to rotate accordingly, and the two second gear rings 53 will drive the two inner toothed belts 54 to transmit accordingly, and the two inner toothed belts 54 will synchronously drive the two first gear rings 25 and the rotating column 24 to rotate, and the two rotating columns 24 will drive the two plug posts 28 to rotate accordingly, and the two plug posts 28 will drive the two electronic components to rotate synchronously, so that the equipment can ensure that the solder joints are evenly distributed on the electronic components during welding, thereby improving the quality and stability of welding;

[0045] In the fourth step, when welding starts, the suction pump 16 can be started through the control panel 18. Under the action of the suction pump 16, the external air will be sucked into the welding box 11 through the air inlet pipe 13, and then the smoke generated by welding will be sucked out from the inside of the welding box 11. The smoke enters the purification box 14 through the exhaust pipe 15, and then is discharged after being filtered by the activated carbon adsorption plate 17. The suction action of the suction pump 16 forms a good airflow circulation, improves the air quality of the working environment, helps to reduce the temperature of the welding area, and prolongs the service life of the equipment;

[0046] In the fifth step, when welding slag is generated during the spot welding process, the welding slag will fall into the collection box 57 for collection under the action of gravity or by contact with the welding gun head 22, so that the device can be used to collect the generated welding slag or impurities simultaneously. By designing the collection box 57 to be inserted into the installation groove 56, the process of removing and cleaning the welding slag is also simpler and more convenient.

[0047] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A spot welding device for manufacturing electronic components, comprising a welding box (11), wherein the welding box (11) is provided with a box door (12), characterized in that: An air inlet pipe (13) is installed on both side walls of the welding box (11); a purification box (14) is fixedly installed on the upper end of the welding box (11); an air extraction pipe (15) is installed inside the purification box (14); the lower end of the air extraction pipe (15) is arranged in the welding box (11); a suction pump (16) is fixedly installed inside the purification box (14); the air inlet end of the suction pump (16) is connected to the air extraction pipe (15); an activated carbon adsorption plate (17) is installed on the upper end of the purification box (14); and the air outlet end of the suction pump (16) is located below the activated carbon adsorption plate (17); A control panel (18) is installed on the side wall of the purification box (14), a manipulator (21) is fixedly installed in the inner wall of the welding box (11), and a welding gun head (22) is installed on the manipulator (21); A clamping mechanism is symmetrically fixedly installed in the inner wall of the welding box (11); The clamping mechanism comprises a U-shaped frame (23), wherein two U-shaped frames (23) are symmetrically mounted on the inner wall of the welding box (11), a rotating column (24) is rotatably mounted inside the two U-shaped frames (23), a first gear ring (25) is fixedly sleeved on the two rotating columns (24), a slot (26) is provided on the opposite ends of the two rotating columns (24), a first threaded ring (27) is threadedly mounted on the two rotating columns (24), a plug-in column (28) is slidably mounted inside the two slots (26), an arc groove (29) is symmetrically opened on the two plug-in columns (28), the two first threaded rings (27) are respectively arranged in two groups of arc grooves (29), and a second threaded ring (25) is threadedly mounted on the two plug-in columns (28). The two plug posts (28) are symmetrically provided with inner grooves (32) at opposite ends thereof, and clamping strips (33) are rotatably installed inside the two inner grooves (32). A cross groove (34) is provided inside the two groups of clamping strips (33). A first spring (35) is fixedly installed on the two groups of clamping strips (33). One end of the two groups of the first springs (35) away from the two groups of clamping strips (33) is fixedly installed in the inner walls of the two groups of inner grooves (32). A cross block (36) is slidably installed inside the two groups of the cross grooves (34). A first screw rod (37) is fixedly installed on the two groups of the cross blocks (36). A second screw rod (43) is fixedly installed inside the two groups of the cross blocks (36). The two groups of the second screw rods (43) are fixedly installed on the two groups of the cross blocks (36). A fourth threaded ring (44) is threadedly installed on each end of the two groups of the second screw rods (43), a slide bar (45) is slidably installed on each of the slide bars (45), and a limit groove (46) is provided on each of the slide bars (45). A clamping plate (47) is arranged between each group of the slide bars (45), and a limit block (48) is symmetrically fixedly installed on the side walls of the two groups of the clamping plates (47), and each limit block (48) is slidably installed in each limit groove (46). A third threaded ring (38) is threadedly installed on the two groups of the first screw rods (37), and a second spring (41) is fixedly installed on the side walls of the two sides of the cross block (36). A connecting ring (42) is fixedly installed on the end of each second spring (41) away from the cross block (36). The upper and lower ends of the clamping plate (47) of the group are fixedly installed with third springs (49), and one end of each third spring (49) away from the clamping plate (47) is fixedly connected to each slide bar (45). A double-headed motor (51) is fixedly installed inside the welding box (11), and driving shafts (52) are installed at both ends of the double-headed motor (51). Second gear rings (53) are fixedly installed on the two driving shafts (52), and the two second gear rings (53) and the two first gear rings (25) are meshed with internal toothed belts (54). A top plate (55) is fixedly installed on the upper end of the double-headed motor (51), and mounting grooves (56) are opened at the four corners of the top plate (55), and a collection box (57) is inserted into the mounting groove (56).

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