A device for preventing current shunting of a multi-spot welding machine

Abstract

The present invention relates to a field of welding technology, and specifically to a device for preventing current shunting of a multi-spot welding machine, comprising a mounting table, two groups of fixing mechanisms capable of fixing metal plates are fixedly mounted on the upper end of the mounting table, a mounting frame is fixedly connected to the upper end of the mounting table, an abutment frame capable of triggering a reset mechanism is fixedly connected to the upper end of the mounting table, a second welding head capable of welding the metal plate is fixedly connected to the outer wall of the mounting block, a high-voltage capacitor capable of increasing the high-voltage current released by the second welding head is fixedly connected to the upper end surface of the mounting block, the high-voltage capacitor is interconnected with the second welding head, an anti-shunting mechanism capable of reducing current shunting when the second welding head is welded is fixedly connected to the bottom of the second welding head, and a high-pressure gas pump capable of delivering high-pressure gas to the anti-shunting mechanism is also fixedly mounted on the upper end of the mounting table, thereby avoiding the problem of short circuit caused by welding of multiple welding heads.

Description

Technical Field

[0001] The invention relates to the technical field of welding, in particular to a device for preventing current shunting of a multi-spot welding machine. Background Art

[0002] Multi-spot welding machine background technology involves the development and optimization of welding equipment, especially the technological progress aimed at improving welding efficiency and quality. Multi-spot welding machine is a kind of welding equipment, which enhances production capacity and operational flexibility by providing multiple welding points. The working principle of multi-spot welding machine is mainly based on resistance welding technology, in which the spot welding machine adopts the principle of double-sided double-point overcurrent welding, and the two layers of metal form contact resistance under the pressure of two electrodes, so as to form instantaneous heat welding at the two contact resistance points. This technology is not only suitable for welding between metals, but also widely used in the connection process of other materials, such as welding of plastics;

[0003] From the perspective of equipment types, welding machines are diverse, including single-point, two-point, three-point, four-point and even six-point welding machines and four-corner welding machines. These different types of welding equipment demonstrate the versatility and adaptability of welding technology. Each welding machine has its specific functions and working efficiency to meet different industrial production needs. However, during the use of multi-spot welding machines, the simultaneous operation of multiple welding heads may cause excessive current output and lead to short circuits, or the spot welding of metal sheets may cause current shunting.

[0004] Chinese patent (Announcement No. CN105834570B), the patent relates to a device for preventing current shunting of a multi-spot welding machine, the welding machine includes multiple welding guns and a welding table corresponding to the welding guns, the objects to be welded are fixed to the welding table by bolts, each welding gun is provided with an anti-current shunting device, the anti-current shunting device includes: a power connection unit: one end is connected to the welding gun and connected to the alternating current; a telescopic joint: the lower end is connected to the welding table through an air-cooled cable tube, and the upper end can rise to contact and connect with the electric fusion connection device; a lifting cylinder: connected to the lower end of the telescopic joint through a connecting block, and at most only one lifting cylinder is in a lifting state. Compared with the prior art, the present invention has a simple structure. During multi-spot welding, only the current at the welding position forms a loop, which effectively prevents the dispersion of the current, improves the quality of welding, and has a stable effect.

[0005] In the existing technology, spot welding with multiple welding heads at the same time may cause excessive current output leading to a short circuit, or current shunting may occur during the spot welding of metal sheets, which will greatly reduce work efficiency and waste time and manpower. In order to solve the problem that spot welding may cause excessive current output leading to a short circuit and current shunting may occur during the spot welding of metal sheets, we propose a device for preventing current shunting in a multi-spot welding machine. Summary of the invention

[0006] The object of the present invention is to provide a device for preventing current shunting of a multi-spot welding machine, so as to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A device for preventing current shunting of a multi-spot welding machine comprises a mounting table, characterized in that two groups of fixing mechanisms capable of fixing metal plates are fixedly mounted on the upper end of the mounting table, a mounting frame is fixedly connected to the upper end of the mounting table, five groups of first welding heads are fixedly connected to the upper end of the mounting frame, two groups of electric telescopic arms are fixedly connected to the upper end of the mounting table, a fixing bar is fixedly connected between the two groups of the electric telescopic arms, five groups of first elastic telescopic rods are fixedly connected to the bottom of the fixing bar, a mounting block is fixedly connected to the output end of the first elastic telescopic rod, a second welding head capable of welding metal plates is fixedly connected to the outer wall of the mounting block, and a resetting mechanism capable of resetting the second welding head is fixedly connected between each group of the mounting blocks and the mounting table;

[0009] An abutment frame that can trigger a reset mechanism is fixedly connected to the upper end of the mounting table, a high-voltage capacitor that can increase the high-voltage current released by the second welding head is fixedly connected to the upper end of the mounting block, the high-voltage capacitor and the second welding head are interconnected, an anti-shunt mechanism that can reduce current shunt when the second welding head is welding is fixedly connected to the bottom of the second welding head, and a high-pressure air pump that can deliver high-pressure gas to the anti-shunt mechanism is also fixedly installed on the upper end of the mounting table.

[0010] As a further feature of the present invention, the fixing mechanism includes a second abutment plate, which is fixedly mounted on the upper end of the mounting table, and the upper end of the second abutment plate is slidably connected to the first abutment plate having a reset function.

[0011] As a further feature of the present invention, the outer wall of the second abutment plate is rotatably connected with an abutment circular plate, and the outer wall of the abutment circular plate is provided with an abutment circular block which can lift the first abutment plate, and the upper end of the abutment circular block abuts against the first abutment plate.

[0012] As a further embodiment of the present invention, the reset mechanism includes a first cylinder, which is fixedly connected to a fixed bar via a mounting plate, a first air plug is slidably connected to the inner wall of the first cylinder, a damper which can slow down the reset speed of the first air plug is fixedly connected between the first air plug and the inner wall of the first cylinder, an abutment block is fixedly connected to one end of the first air plug away from the damper, and an inclined wall is provided at the bottom of the abutment block.

[0013] As a further feature of the present invention, a connecting block is fixedly connected between the first elastic telescopic rod and the mounting block, the upper end of the connecting block abuts against the outer wall of the inclined wall, the bottom of the connecting block is provided with a curved surface that can reduce friction with the outer wall of the abutment block, a first elastic spring is provided inside the first elastic telescopic rod, the bottom end of the inner wall of the first elastic telescopic rod is also fixedly connected to an abutment rod, and the outer wall of the abutment rod is slidably connected to the inside of a fixed bar, the fixing bar is fixedly connected to a second cylinder, a second air plug is slidably connected to the inside of the second cylinder, and the second air plug is connected to the first cylinder with each other.

[0014] As a further feature of the present invention, the anti-diversion mechanism includes a connecting air pipe, the outer wall of which is fixedly connected to a pressure block, a plurality of inclined grooves are provided inside the pressure block, and one end of the connecting air pipe close to the pressure block is also fixedly connected to an installation outer tube, the pressure block is located inside the installation outer tube, and the outer wall of the installation outer tube is provided with a connecting air port for injecting high-pressure gas into the inclined groove.

[0015] As a further feature of the present invention, one end of the air pressure round block away from the connecting air pipe is fixedly connected to a cold air pipe, one end of the cold air pipe close to the air pressure round block is fixedly connected to the mounting outer pipe, the inside of the connecting air pipe is fixedly connected to a conical block, a plurality of air dispersion ports are provided inside the conical block, one end of the connecting air pipe away from the air pressure round block is fixedly connected to a hot air pipe, and the high-pressure air pump is fixedly connected to the connecting air port.

[0016] As a further feature of the present invention, a first gas box is fixedly connected to the outer wall of the second welding head, the first gas box is fixedly connected to the hot air pipe, a second telescopic barrel is fixedly connected to the bottom of the first gas box, a mounting circular plate is fixedly connected to the interior of the second telescopic barrel, six groups of first abutment columns with a reset function are slidably connected to the interior of the mounting circular plate, a second gas box is fixedly connected to the outer wall of the second telescopic barrel, six groups of second abutment columns with a reset function are fixedly connected to the bottom of the second gas box, and the second gas box is fixedly connected to the cold air pipe.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. When the present invention is used, when the first telescopic barrel and the second telescopic barrel abut against the plate at the same time, the first abutting column and the second abutting column are both contracted, and because the first abutting column and the second abutting column move upward, the inclined groove and the first gas port are both unblocked, and the hot high-pressure gas inside the first gas box will heat the range abutted by the second telescopic barrel. Preheating can slow down the cooling rate after welding, which is conducive to the escape of diffused hydrogen in the weld metal and avoids the generation of hydrogen-induced cracks. This process reduces the hardening degree of the weld and the heat-affected zone, thereby improving the crack resistance of the weld joint. Appropriate preheating can ensure that the temperature of the welding area is uniform and avoid internal and external splashing caused by local overheating. Spatter not only affects the appearance quality of the weld, but also may bring safety hazards. Therefore, controlling the welding temperature by preheating is an effective means to reduce spatter. Preheating allows the workpiece to reach a certain temperature before welding, so that it can reach a melting state faster during formal welding, thereby improving the welding speed. The heating part can increase the resistance to prevent current shunting during welding.

[0019] 2. When the present invention is used, when the electric telescopic arm drives the second welding head to continue to descend through the first elastic telescopic rod, the inclined wall will leave the abutment with the connecting block. At this time, the first elastic telescopic rod will drive the connecting block to shrink. At this time, the electric telescopic leg continues to drive the following groups of second welding heads to descend, and the plates can be welded in sequence, avoiding the impact of short circuit or excessive power load caused by welding multiple groups at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a front view of a device for preventing current shunting of a multi-spot welding machine.

[0021] Figure 2 The present invention is a rear view of a device for preventing current shunting of a multi-spot welding machine.

[0022] Figure 3 The present invention is a schematic diagram of the structure of the fixed bar position of a device for preventing current shunting of a multi-spot welding machine.

[0023] Figure 4 The present invention is a schematic diagram of the structure of a fixing mechanism of a device for preventing current shunting of a multi-spot welding machine.

[0024] Figure 5 The present invention is a schematic diagram of the internal structure of the first cylinder in a device for preventing current shunting of a multi-spot welding machine.

[0025] Figure 6 The present invention is a schematic diagram of the internal structure of a first elastic telescopic rod in a device for preventing current shunting of a multi-spot welding machine.

[0026] Figure 7 The present invention is a schematic diagram of the structure of the second cylinder position in a device for preventing current shunting of a multi-spot welding machine.

[0027] Figure 8 The present invention is a schematic diagram of the position structure of the first gas box in a device for preventing current shunting of a multi-spot welding machine.

[0028] Fig. 9 The present invention is a schematic diagram of connecting an air pipe and a conical block in a device for preventing current shunting of a multi-spot welding machine.

[0029] Fig.10 The present invention is a schematic diagram of the structure of the inclined slot position in a device for preventing current shunting of a multi-spot welding machine.

[0030] Fig.11 The present invention is a schematic diagram of the internal structure of a connecting air pipe in a device for preventing current shunting of a multi-spot welding machine.

[0031] Fig.12 The present invention is a schematic diagram of the internal structure of a second telescopic barrel in a device for preventing current shunting of a multi-spot welding machine.

[0032] Fig.13 The present invention is a schematic diagram of the upper structure of the first gas box in a device for preventing current shunting of a multi-spot welding machine.

[0033] Fig.14 The present invention is a schematic diagram of the bottom structure of the first gas box in a device for preventing current shunting of a multi-spot welding machine.

[0034] In the figure: 1, mounting table; 2, electric telescopic leg; 3, mounting frame; 4, first welding head; 5, second welding head; 6, second elastic spring; 7, high-voltage capacitor; 8, mounting block; 9, abutment frame; 10, fixing bar; 11, high-pressure air pump; 12, electric telescopic arm; 13, first elastic telescopic rod; 14, first abutment plate; 15, sliding rod; 16, third elastic spring; 17, abutment round block; 18, abutment round plate; 19, first abutment column;

[0035] 20. Second abutment plate; 21. First cylinder; 22. First air plug; 23. Abutment block; 24. Oblique wall; 25. Connecting block; 26. Mounting circular plate; 27. Damper; 28. Fourth elastic spring; 29. ​​Abutment rod; 30. Second air plug; 31. Second cylinder; 32. First air box; 33. First telescopic barrel; 34. Connecting air pipe; 35. Connecting air port; 36. Mounting outer pipe; 37. Air pressure circular block; 38. Cold air pipe; 39. Conical block;

[0036] 40. hot air pipe; 41. air diffusion port; 42. inclined slot; 43. second air box; 44. fifth elastic spring; 45. second abutting column; 46. first air port; 47. second telescopic barrel; 48. second air port; 101. fixing mechanism; 201. reset mechanism; 301. anti-diversion mechanism. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Example 1: Please refer to Figure 1 , 2 , 3, 4, 5, and 6, in an embodiment of the present invention, a device for preventing current shunting of a multi-spot welding machine includes a mounting table 1, four groups of freely retractable electric telescopic legs 2 are fixedly connected to the bottom of the mounting table 1, and the electric telescopic legs 2 can arbitrarily increase the height of the mounting table 1, so that workers of different heights can adjust the mounting table 1 to a suitable height through the four groups of electric telescopic legs 2, two groups of fixing mechanisms 101 that can fix metal plates are fixedly installed on the upper end of the mounting table 1, and the two groups of fixing mechanisms 101 are symmetrically distributed, the upper end surface of the mounting table 1 is fixedly connected to a mounting frame 3 by bolts, the upper end surface of the mounting frame 3 is fixedly connected to five groups of first welding heads 4, two groups of electric telescopic arms 12 are fixedly connected to the upper end of the mounting table 1, a fixing bar 10 is fixedly connected between the two groups of electric telescopic arms 12, and five groups of first elastic telescopic rods are welded and fixedly connected to the bottom of the fixing bar 10 13. The output end of the first elastic telescopic rod 13 is fixedly connected with a mounting block 8, and five groups of mounting blocks 8 are arranged in sequence from high to low. The outer wall of the mounting block 8 is fixedly connected with a second welding head 5 that can be welded to a metal plate. A reset mechanism 201 that can reset the second welding head 5 is fixedly connected between each group of mounting blocks 8 and the mounting table 1. An abutment frame 9 that can trigger the reset mechanism 201 is fixedly connected to the upper end of the mounting table 1, and each group of second welding heads 5 is located directly above the corresponding first welding head 4. A high-voltage capacitor 7 that can increase the high-voltage current released by the second welding head 5 is fixedly connected to the upper end surface of the mounting block 8. The high-voltage capacitor 7 is interconnected with the second welding head 5. An anti-shunt mechanism 301 that can reduce the current shunt during welding of the second welding head 5 is fixedly connected to the bottom of the second welding head 5. A high-pressure gas pump 11 that can deliver high-pressure gas to the anti-shunt mechanism 301 is also fixedly installed on the upper end of the mounting table 1.

[0039] Example 2: Please refer to Figure 1 , 2As shown in , 4, the fixing mechanism 101 includes a second abutting plate 20, the second abutting plate 20 is fixedly mounted on the upper end of the mounting table 1, the upper end of the second abutting plate 20 is slidably connected to the first abutting plate 14 with a reset function, specifically, the upper end of the sliding rod 15 is fixedly connected with the sliding rod 15, the first abutting plate 14 is slidably connected to the outer wall of the sliding rod 15, a third elastic spring 16 is fixedly connected between the first abutting plate 14 and the second abutting plate 20, the third elastic spring 16 is sleeved on the outer surface of the sliding rod 15, more specifically, two groups of sliding grooves are provided inside the first abutting plate 14, the outer wall of the sliding rod 15 is slidably connected to the inner wall of the sliding groove, and the inner wall of the sliding groove and the outer wall of the sliding rod 15 are both coated with lubricating oil, the opposite ends of the first abutting plate 14 and the second abutting plate 20 are fixedly connected with an anti-slip rubber pad, the two groups of plates to be welded are placed between the first abutting plate 14 and the second abutting plate 20, and the first abutting plate 1 is fixedly connected to the second abutting plate 14 by the third elastic spring 16. The first abutment plate 14 and the second abutment plate 20 can be reset, and the plates to be welded can be clamped by the first abutment plate 14 and the second abutment plate 20. The sliding rod 15 can guide the first abutment plate 14, and the two sets of sliding rods 15 can also improve the stability of the first abutment plate 14 when moving. The lubricating oil can greatly reduce the friction of the sliding rod 15 inside the sliding groove, and extend the service life of the sliding rod 15 and the sliding groove. The anti-skid rubber pad can also enhance the friction between the first abutment plate 14 and the second abutment plate 20 on the steel, so that the second abutment plate 20 and the first abutment plate 14 are better fixed to the steel. The outer wall of the second abutment plate 20 is rotatably connected with an abutment circular plate 18, and a reset torsion spring is fixedly connected between the abutment circular plate 18 and the second abutment plate 20, and the reset torsion spring can better reset the abutment circular plate 18. The outer wall of the abutment circular plate 18 is provided with an abutment circular block 17 that can lift the first abutment plate 14, and the upper end of the abutment circular block 17 abuts against the first abutment plate 14.

[0040] Please refer to Figure 1 , 2As shown in Figures 5, 6, and 7, the reset mechanism 201 includes a first cylinder 21, which is fixedly connected to the fixing bar 10 through a mounting plate, a first air plug 22 is slidably connected to the inner wall of the first cylinder 21, a sealing ring is installed on the outer wall of the first air plug 22, and the outer wall of the sealing ring abuts against the inner wall of the first cylinder 21, when the first air plug 22 moves on the inner wall of the first cylinder 21, the sealing ring can well improve the sealing between the first air plug 22 and the first cylinder 21, a damper 27 that can slow down the reset speed of the first air plug 22 is fixedly connected between the first air plug 22 and the inner wall of the first cylinder 21, and a fourth elastic spring 28 is also fixedly connected between the first air plug 22 and the inner wall of the first cylinder 21, an abutting block 23 is fixedly connected to the end of the first air plug 22 away from the damper 27, and an inclined wall 24 is provided at the bottom of the abutting block 23, a connecting block 25 is fixedly connected between the first elastic telescopic rod 13 and the mounting block 8, and the connecting block 2 The upper end of the connecting block 25 abuts against the outer wall of the inclined wall 24, and the bottom of the connecting block 25 is provided with a curved surface that can reduce the friction with the outer wall of the abutting block 23. A first elastic spring is provided inside the first elastic telescopic rod 13, and the bottom end of the inner wall of the first elastic telescopic rod 13 is also fixedly connected to the abutting rod 29, and the outer wall of the abutting rod 29 is slidably connected to the inside of the fixing bar 10, and the fixing bar 10 is fixedly connected to the second cylinder 31, and the second cylinder 31 is slidably connected to the second air plug 30, and the second air plug 30 is connected to the first cylinder 21. Specifically, a steel pipe is connected between the first cylinder 21 and the second cylinder 31. The steel pipe has the characteristics of not easy to deform, high temperature resistance and corrosion resistance. When the first cylinder 21 and the first air plug 22 and the second air plug 30 inside the second cylinder 31 move back and forth, the second cylinder 31 and the first cylinder 21 inhale and deflate each other, and at this time, the steel pipe between the first cylinder 21 and the second cylinder 31 will not be deformed by the influence of air pressure.

[0041] Please refer to Figure 1 , 2As shown in Figures 8, 9, 10, and 11, the anti-diversion mechanism 301 includes a connecting air pipe 34, the outer wall of the connecting air pipe 34 is fixedly connected to a gas pressure round block 37, a plurality of inclined grooves 42 are opened inside the gas pressure round block 37, and the inclined grooves 42 are distributed in a circle, and the inner wall of the inclined groove 42 is inclined at an angle, so that when the high-pressure gas passes through the inner wall of the inclined groove 42, the high-pressure gas will first pass through the inner wall of the inclined groove 42, and then move from the inner wall of the connecting air pipe 34, and because the inner wall of the inclined groove 42 is inclined at an angle, the gas will move in a high-speed spiral on the inner wall of the connecting air pipe 34 under the action of the inclined angle of the inner wall of the inclined groove 42, and the end of the connecting air pipe 34 close to the gas pressure round block 37 is also fixedly connected to the mounting outer tube 36, and the gas pressure round block 37 is located Inside the outer tube 36, a connecting air port 35 is provided on the outer wall of the outer tube 36 for injecting high-pressure gas into the inclined groove 42. The end of the air pressure block 37 away from the connecting air pipe 34 is fixedly connected to the cold air pipe 38. The end of the cold air pipe 38 close to the air pressure block 37 is fixedly connected to the outer tube 36, and the cold air pipe 38, the inclined groove 42 and the connecting air pipe 34 are interconnected. The connecting air pipe 34 is fixedly connected to a conical block 39, the conical block 39 is conical in shape, and a plurality of air dispersion ports 41 are provided inside the conical block 39, and the plurality of air dispersion ports 41 are also distributed in a circle. The end of the connecting air pipe 34 away from the air pressure block 37 is fixedly connected to the hot air pipe 40, and the high-pressure air pump 11 is fixedly connected to the connecting air port 35.

[0042] Please refer to Fig.12 , 13As shown in FIG. 14 , the outer wall of the second welding head 5 is fixedly connected to the first gas box 32, the first gas box 32 is fixedly connected to the hot gas pipe 40, the bottom of the first gas box 32 is fixedly connected to the second telescopic barrel 47, the interior of the second telescopic barrel 47 is fixedly connected to the mounting circular plate 26, the interior of the mounting circular plate 26 is slidably connected to six groups of first abutting columns 19 with a reset function, specifically, six groups of first gas ports 46 are opened inside the mounting circular plate 26, each group of first abutting columns 19 is slidably connected to the inner wall of the corresponding first gas port 46, and the first A second elastic spring 6 is fixedly connected between an abutting column 19 and the mounting circular plate 26, and the second elastic spring 6 is sleeved on the outer wall of the first abutting column 19. The inner wall of the first air port 46 and the outer wall of the first abutting column 19 are also coated with lubricating oil. When the first abutting column 19 is squeezed with the plate to be welded, the first abutting column 19 moves upward, and the second elastic spring 6 can quickly reset the first abutting column 19. The outer wall of the second telescopic barrel 47 is fixedly connected to the second air box 43, and the bottom of the second air box 43 is fixedly connected to six groups of The second abutment column 45 with a reset function, specifically, six groups of second air ports 48 are opened at the bottom end of the inner wall of the second air box 43, each group of second abutment columns 45 is slidably connected in the inner wall of a corresponding group of second air ports 48, a fifth elastic spring 44 is fixedly connected between the second abutment column 45 and the second air box 43, and the fifth elastic spring 44 is sleeved on the outer surface of the second abutment column 45, the second air box 43 is fixedly connected to the cold air pipe 38, and the second abutment column 45 and the first abutment column 19 are made of ceramic material, and when the second welding When the joint 5 is welded to the welding plate, since the second abutment column 45 contacts the first abutment column 19 before the welding plate, and since the second welding head 5 and the first welding head 4 will generate high temperature for the welding plate, they are welded, and since the first abutment column 19 and the first abutment column 19 are both made of ceramic material, they have the characteristics of high temperature resistance and corrosion resistance, and are not conductive, a number of notches are opened at the bottom of the second telescopic barrel 47 and the first telescopic barrel 33 to prevent gas from being discharged from the inside of the second telescopic barrel 47 and the first telescopic barrel 33.

[0043] The working principle of the present invention is: when the welding plate needs to be fixed, the plate is placed between the first abutting plate 14 and the second abutting plate 20, and the abutting circular plate 18 is rotated at this time, and the third elastic spring 16 drives the first abutting plate 14 to reset, and the first abutting plate 14 fixes the plate to be welded;

[0044] Start the high-pressure air pump 11, and the high-pressure air pump 11 inflates the inside of the installation outer tube 36 through the connecting air port 35. The gas inside the installation outer tube 36 enters the inside of the inclined groove 42 through the air pressure round block 37. The electric telescopic arm 12 will drive the first elastic telescopic rod 13 to descend through the fixing bar 10. The first elastic telescopic rod 13 will drive the second welding head 5 to move toward the corresponding first welding head 4 through the mounting block 8, and the second welding head 5 and the first welding head 4 can weld the plate. Since five groups of second welding heads 5 weld the plate at the same time, the current output may be too large, resulting in a short circuit. In the case of the high-pressure gas passing through the inner wall of the chute 42, the high-pressure gas will first pass through the inner wall of the chute 42, and then move from the inner wall of the connecting air pipe 34. Since the inner wall of the chute 42 is inclined at an angle, the gas will move in a spiral at high speed on the inner wall of the connecting air pipe 34 under the action of the inclined angle of the inner wall of the chute 42. When the gas moves at a high speed, a high-pressure area will be formed in the middle of the conical block 39 with the high-speed moving gas. At this time, the high-pressure area will transport gas in the direction of the cold air pipe 38. At this time, both groups of gas are moving in a spiral, and the two groups of gas are moving in opposite directions. The spiral rotates, and the two groups of gases move in opposite directions, rubbing against each other at high speed during the movement. The gas ejected from the diffuser 41 will reach a high temperature of more than 150 degrees, and the gas ejected from the hot air pipe 40 will reach a low temperature of about minus 45 degrees, and the high temperature will enter the first gas box 32 through the hot air pipe 40, and the low-temperature gas ejected from the cold air pipe 38 will enter the second gas box 43. When it is necessary to weld the plate, when the first telescopic barrel 33 and the second telescopic barrel 47 are simultaneously abutted against the plate, the first abutting column 19 and the second abutting column 45 are both Contraction, and because the first abutment column 19 and the second abutment column 45 move upward, the inclined groove 42 and the first gas port 46 are both unblocked, and the hot high-pressure gas inside the first gas box 32 will heat the range abutted by the second telescopic barrel 47. Preheating can slow down the cooling rate after welding, which is beneficial to the escape of diffused hydrogen in the weld metal and avoids hydrogen-induced cracks. This process reduces the hardening degree of the weld and the heat-affected zone, thereby improving the crack resistance of the welded joint. Proper preheating can ensure uniform temperature in the welding area and avoid internal and external splashing caused by local overheating. Spatter not only affects the appearance quality of the weld, but may also bring safety hazards. Therefore, controlling the welding temperature by preheating is an effective means to reduce spatter. Preheating allows the workpiece to reach a certain temperature before welding, so that it can reach a melting state more quickly during formal welding, thereby increasing the welding speed. The cold air inside the second gas box 43 will enter between the first telescopic barrel 33 and the plate. The high-pressure cold air inside the first telescopic barrel 33 can cool the outside of the range covered by the second telescopic barrel 47 to prevent the hot air inside the second telescopic barrel 47 from affecting the range not covered by the second telescopic barrel 47. It is worth noting that the heating part can increase the resistance to prevent current shunting during welding.

[0045] When the electric telescopic arm 12 drives the second welding head 5 to continue to descend through the first elastic telescopic rod 13, the inclined wall 24 will leave the contact with the connecting block 25. At this time, the first elastic telescopic rod 13 will drive the connecting block 25 to shrink. At this time, the electric telescopic leg 2 continues to drive the following groups of second welding heads 5 to descend, and the plates can be welded in sequence, avoiding the influence of short circuit or excessive power load caused by welding of multiple groups at the same time. If it is necessary to reset the first elastic telescopic rod 13, start the two groups of electric telescopic arms 12, and the two groups of electric telescopic arms 12 drive the second gas plug 30 and the abutment rod 29 to move upward through the fixing bar 10. When the second gas plug 30 and the abutment rod 2 When 9 abuts against the abutment frame 9, the abutment frame 9 will first abut against the abutment rod 29, and the five groups of abutment rods 29 will drive the electric telescopic arm 12 to reset in turn. At this time, when the second air plug 30 is completely abutted against the abutment frame 9, the gas inside the abutment frame 9 will enter the first cylinder 21, and the first air plug 22 inside the first cylinder 21 will drive the abutment block 23 to move in the direction of the first elastic telescopic rod 13. At this time, the electric telescopic arm 12 is started to drive the fixing bar 10 to move upward. Since a damper 27 is connected between the first air plug 22 and the first cylinder 21, the damper 27 can slow down the speed of resetting the first air plug 22, so that when the connecting block 25 resets upward, the connecting block 25 can abut against the inclined wall 24.

[0046] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for preventing current shunting in a multi-spot welding machine, comprising a mounting table (1), characterized in that: Two groups of fixing mechanisms (101) capable of fixing metal plates are fixedly installed on the upper end of the installation table (1); a mounting frame (3) is fixedly connected to the upper end of the installation table (1); five groups of first welding heads (4) are fixedly connected to the upper end of the installation frame (3); two groups of electric telescopic arms (12) are fixedly connected to the upper end of the installation table (1); a fixing bar (10) is fixedly connected between the two groups of electric telescopic arms (12); five groups of first elastic telescopic rods (13) are fixedly connected to the bottom of the fixing bar (10); a mounting block (8) is fixedly connected to the output end of the first elastic telescopic rod (13); a second welding head (5) capable of being welded to the metal plate is fixedly connected to the outer wall of the mounting block (8); and a resetting mechanism (201) capable of resetting the second welding head (5) is fixedly connected between each group of the mounting blocks (8) and the installation table (1); The upper end of the mounting table (1) is fixedly connected to an abutment frame (9) capable of triggering a reset mechanism (201); the upper end surface of the mounting block (8) is fixedly connected to a high-voltage capacitor (7) capable of increasing the high-voltage current released by the second welding head (5); the high-voltage capacitor (7) and the second welding head (5) are interconnected; the bottom of the second welding head (5) is fixedly connected to an anti-shunt mechanism (301) capable of reducing current shunt during welding of the second welding head (5); and the upper end of the mounting table (1) is also fixedly installed with a high-pressure gas pump (11) capable of delivering high-pressure gas to the anti-shunt mechanism (301).

2. A device for preventing current shunting in a multi-spot welding machine according to claim 1, characterized in that: The fixing mechanism (101) comprises a second abutment plate (20), the second abutment plate (20) being fixedly mounted on the upper end of the mounting table (1), the upper end of the second abutment plate (20) being slidably connected to a first abutment plate (14) having a reset function.

3. A device for preventing current shunting of a multi-spot welding machine according to claim 2, characterized in that: The outer wall of the second abutment plate (20) is rotatably connected to an abutment circular plate (18), and the outer wall of the abutment circular plate (18) is provided with an abutment circular block (17) capable of lifting the first abutment plate (14), and the upper end of the abutment circular block (17) abuts against the first abutment plate (14).

4. A device for preventing current shunting in a multi-spot welding machine according to claim 1, characterized in that: The reset mechanism (201) comprises a first cylinder (21), the first cylinder (21) being fixedly connected to a fixing bar (10) via a mounting plate, a first air plug (22) being slidably connected to the inner wall of the first cylinder (21), a damper (27) being fixedly connected between the first air plug (22) and the inner wall of the first cylinder (21) for slowing down the reset speed of the first air plug (22), an end of the first air plug (22) away from the damper (27) being fixedly connected to an abutment block (23), and an inclined wall (24) being provided at the bottom of the abutment block (23).

5. A device for preventing current shunting of a multi-spot welding machine according to claim 2, characterized in that: A connecting block (25) is fixedly connected between the first elastic telescopic rod (13) and the mounting block (8); the upper end of the connecting block (25) abuts against the outer wall of the inclined wall (24); the bottom of the connecting block (25) is provided with a curved surface that can reduce friction with the outer wall of the abutting block (23); a first elastic spring is provided inside the first elastic telescopic rod (13); the bottom end of the inner wall of the first elastic telescopic rod (13) is also fixedly connected to an abutting rod (29); the outer wall of the abutting rod (29) is slidably connected to the inside of the fixing bar (10); the fixing bar (10) is fixedly connected to a second cylinder (31); a second air plug (30) is slidably connected to the inside of the second cylinder (31); the second air plug (30) and the first cylinder (21) are connected to each other.

6. A device for preventing current shunting in a multi-spot welding machine according to claim 1, characterized in that: The anti-diversion mechanism (301) comprises a connecting air pipe (34), the outer wall of the connecting air pipe (34) is fixedly connected with a gas pressure round block (37), a plurality of inclined grooves (42) are provided inside the gas pressure round block (37), one end of the connecting air pipe (34) close to the gas pressure round block (37) is also fixedly connected with an installation outer tube (36), the gas pressure round block (37) is located inside the installation outer tube (36), and the outer wall of the installation outer tube (36) is provided with a connecting air port (35) for injecting high-pressure gas into the inclined groove (42).

7. A device for preventing current shunting in a multi-spot welding machine according to claim 6, characterized in that: The end of the air pressure round block (37) away from the connecting air pipe (34) is fixedly connected to a cold air pipe (38), and the end of the cold air pipe (38) close to the air pressure round block (37) is fixedly connected to the mounting outer pipe (36). The connecting air pipe (34) is fixedly connected to a conical block (39), and a plurality of air dispersion ports (41) are provided inside the conical block (39). The end of the connecting air pipe (34) away from the air pressure round block (37) is fixedly connected to a hot air pipe (40), and the high-pressure air pump (11) is fixedly connected to the connecting air port (35).

8. A device for preventing current shunting in a multi-spot welding machine according to claim 7, characterized in that: The outer wall of the second welding head (5) is fixedly connected to a first gas box (32), the first gas box (32) is fixedly connected to a hot gas pipe (40), the bottom of the first gas box (32) is fixedly connected to a second telescopic barrel (47), the interior of the second telescopic barrel (47) is fixedly connected to a mounting circular plate (26), the interior of the mounting circular plate (26) is slidably connected to six groups of first abutment columns (19) with a reset function, the outer wall of the second telescopic barrel (47) is fixedly connected to a second gas box (43), the bottom of the second gas box (43) is fixedly connected to six groups of second abutment columns (45) with a reset function, and the second gas box (43) is fixedly connected to a cold gas pipe (38).

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