A multi-head resistance spot welding machine with adjustable node-welding pitch

Abstract

The application discloses a plate-fin heat sink multi-head resistance spot welding machine with adjustable node welding spacing, and relates to the technical field of plate-fin heat sink resistance spot welding equipment. The plate-fin heat sink multi-head resistance spot welding machine comprises a mounting plate, a plurality of guide machine heads are slidably connected to the surface of the mounting plate, a spot welding electrode head is arranged at the bottom end of the guide machine head, a locking assembly is arranged above the spot welding electrode head for limiting the spot welding electrode head, a smoke suction assembly is symmetrically arranged on the outer wall of the spot welding electrode head for collecting smoke, and the locking assembly comprises a fixed plate which is fixedly connected to the lower position of the outer wall of the guide machine head. The fixed block and the clamping block on the moving plate are matched with each other, so that the spot welding electrode head can be stably attached to the surface of the workpiece when moving downward, the welding pressure of each group of welding points is uniform, the defects of virtual welding and false welding caused by the suspension of the low-position electrode are avoided to a certain extent, the workpiece is prevented from being pressed through or the indentation being too deep caused by the pressure overload of the high-position electrode, and the quality of the heat sink welding product is improved.

Description

Technical Field

[0001] This invention relates to the field of plate heat sink resistance spot welding equipment, specifically a plate heat sink multi-head resistance spot welding machine with adjustable spot welding spacing. Background Technology

[0002] The multi-head resistance spot welding machine for plate heat sinks is a special resistance welding equipment developed for mass welding of plate heat sinks (heat sink fins and substrate, heat sink splicing, heat sink sheet metal components). It completes the welding of multiple weld points at one time by using multiple sets of electrodes to work synchronously or in a time-sharing manner. It mostly adopts a gantry-type rigid frame with multiple sets of independent welding heads installed on the crossbeam. The welding heads can slide left and right along the crossbeam to adjust the spacing and adapt to the welding point layout of heat sinks of different specifications.

[0003] Currently, in the field of plate heat sink welding, the main equipment for achieving synchronous downward movement of multiple welding heads is the integrated pressure gantry multi-head welding machine. This is the most mainstream and classic model in the mass production of plate heat sinks. All welding heads are rigidly fixed on the same integrated pressure beam. The two ends of the beam are driven by 1 to 2 main air cylinders / hydraulic cylinders, which work together with the vertical guide rails on both sides to perform horizontal lifting. It is widely used in the mass standardized production of heat sinks for oil heaters, heat sink sheet metal for air conditioners, and conventional power electronic heat sinks. It is a standard piece of equipment in the production line of heat sink components for home appliances.

[0004] In existing technologies, the assembly and fixing of plate heat sink fins to the substrate often employs multi-head resistance spot welding. This method uses multiple sets of electrodes to simultaneously apply current and pressure, achieving synchronous welding at multiple points to meet the efficiency requirements of large-scale production. However, in actual production, due to the combined influence of multiple factors such as dimensional tolerances in fin punching and depth deviations in substrate slot processing, it is difficult to maintain an ideal coplanar state on the welding end faces of the heat sink fins. Vertical height deviations may exist on the surfaces of different welding points, making it difficult to form a uniform and flat welding reference surface. Current conventional multi-head resistance spot welding equipment struggles to achieve synchronous welding. During the pressing operation, each electrode head cannot autonomously adjust the pressing stroke and contact pressure according to the actual height of the corresponding point. Welding points with excessive height will contact the electrode first and bear excessive pressure load, while welding points with excessive height will have problems such as poor electrode fit or even suspension. Ultimately, this will cause significant differences in contact pressure and contact resistance between welding points, which may lead to problems such as poor welding, false welding, and workpiece crushing, which will cause the workpiece to be scrapped. This makes it difficult to ensure the assembly accuracy and performance of the finished heat sink, and to a certain extent, it is not conducive to quality control and capacity improvement in large-scale production. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a multi-head resistance spot welding machine for plate heat sinks with adjustable spot welding spacing, so as to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-head resistance spot welding machine for plate heat sinks with adjustable spot welding spacing, comprising a mounting plate, wherein multiple sets of guide heads are slidably connected to one side surface of the mounting plate, a spot welding electrode head is provided at the bottom end of the guide head, a locking component is provided above the spot welding electrode head to limit its position, and a smoke collection component is symmetrically provided on the outer wall of the spot welding electrode head to collect fumes. The locking assembly includes a fixed plate fixedly connected to the lower part of the outer wall of the guide head, a movable plate sleeved on the outer wall of the spot welding electrode head below the fixed plate, a fixed block fixedly connected to the upper surface of the movable plate, and a locking block on one side of the fixed block; The fumigation assembly includes fumigation hoods symmetrically arranged on both sides of the spot welding electrode head. The surface of the fumigation hood is connected to a suction pipe, and the other end of the suction pipe is connected to an exhaust fan.

[0007] Preferably, a spring is sleeved on the outer wall of the spot welding electrode head, and the spring is connected to the lower surface of the movable plate. A guide rod is slidably connected to the side of the movable plate away from the fixed block, and the top end of the guide rod is connected to the fixed plate.

[0008] Preferably, a fixing cover is fixedly connected to the lower surface of the fixing plate, the locking block is located on the inner wall of the fixing cover, the top of the fixing block extends to the inner wall of the fixing cover, a limiting plate is fixedly connected to the inner wall of the fixing cover, the limiting plate is located below the locking block and in contact with the locking block.

[0009] Preferably, a groove is formed on one side surface of the fixing block, and multiple sets of slots are formed on the surface of the fixing block below the groove. The slots are engaged with the inner wall of the groove, and the slots are engaged with the slots during movement.

[0010] Preferably, both ends of the fixing plate are provided with slots, and the ends of the two sets of fume hoods away from the spot welding electrode head are connected to connecting rods. The top of the connecting rods extends to the inner wall of the slots. The top of the fixing plate is symmetrically provided with drive motors, and the output end of the drive motors extends to the inner wall of the slots and is connected to the connecting rods.

[0011] Preferably, one set of the smoking hood shaft ends extend to the outer wall of the connecting rod and is fixedly connected to an arc-shaped rod, and one side surface of the connecting rod is connected to an arc-shaped sleeve, the arc-shaped rod being slidably connected to the inner wall of the arc-shaped sleeve.

[0012] Preferably, the top of the fixing block is provided with a piston rod on the inner wall of the fixing cover, and the outer wall of the piston rod is connected to a connecting pipe. The connecting pipe extends to the outside of the fixing cover and is connected to the arc-shaped sleeve.

[0013] In summary, the present invention has the following main beneficial effects: 1. This invention, through the cooperation of the fixed block and the locking block on the moving plate, can automatically match the actual surface height of each point on the workpiece during the pre-pressing process. Relying on the reaction force of the workpiece, the fixed block is pushed upward. When the locking block is locked into the inner wall of the slot, the height of the spot welding electrode head can be limited. When the formal welding process is executed for the second time, all spot welding electrode heads move downward and can be stably attached to the surface of the workpiece at the same time, ensuring that the welding pressure of each group of welding points is uniform and consistent. To a certain extent, it avoids the defects of false welding and false welding caused by the suspension of the low electrode, and avoids the defects such as workpiece crushing and deep indentation caused by the overload of the high electrode pressure, which significantly improves the quality of the heat sink welding product. 2. This invention uses symmetrical fume hoods on both sides of the spot welding electrode head. A drive motor, in conjunction with a connecting rod, causes the fume hoods to swing circumferentially, thereby widening the fume collection area, increasing the collection range, and improving the coverage and capture efficiency of the fume collection. Simultaneously, by adjusting the distance the fixed block moves, the downward tilt angle of the fume hood can be automatically adjusted according to the actual height of the workpiece at each point. The greater the contraction distance of the spot welding electrode head and the higher the corresponding point, the greater the downward tilt of the fume hood, which facilitates filling the collection gaps between high and low points. Combined with the upward drifting motion characteristics of the heated fumes, the fume collection is achieved, effectively reducing the escape of harmful metal fumes and protecting the occupational health of workers. Attached Figure Description

[0014] Figure 1 This is a first-view perspective three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 This is a second-view perspective three-dimensional schematic diagram of the overall structure of the present invention; Figure 3 This is a three-dimensional schematic diagram of part of the structure of the present invention; Figure 4 This is a three-dimensional schematic diagram of the overall structure of the locking component and the smoking component of the present invention; Figure 5 This is a three-dimensional schematic diagram of the locking component and the smoking component of the present invention; Figure 6 This is a three-dimensional disassembly diagram of a portion of the locking component of the present invention; Figure 7 This is an exploded perspective view of a portion of the smoking component of the present invention.

[0015] In the diagram: 1. Mounting plate; 2. Guide head; 3. Spot welding electrode head; 41. Moving plate; 42. Guide rod; 43. Fixing block; 431. Slide groove; 432. Slot; 44. Fixing plate; 441. Slot; 45. Fixing cover; 451. Limiting plate; 46. Locking block; 51. Connecting rod; 52. Fume hood; 521. Suction pipe; 53. Arc rod; 54. Arc sleeve; 55. Connecting pipe; 56. Piston rod. Detailed Implementation

[0016] A multi-head resistance spot welding machine for plate heat sinks with adjustable spot welding spacing, such as Figure 1 - Figure 7 As shown, it includes a mounting plate 1. Multiple sets of guide heads 2 are slidably connected to one side surface of the mounting plate 1. A spot welding electrode head 3 is provided at the bottom of the guide head 2. The spot welding electrode head 3 is controlled to move vertically downward by the guide head 2. When the spot welding electrode head 3 contacts the surface of the heat sink, spot welding can be performed on the heat sink by the spot welding electrode head 3. A locking component is provided above the spot welding electrode head 3 to limit its movement. A smoke collection component is symmetrically provided on the outer wall of the spot welding electrode head 3 to collect the smoke. The locking assembly includes a fixed plate 44 fixedly connected to the lower part of the outer wall of the guide head 2. Below the fixed plate 44 is a movable plate 41 sleeved on the outer wall of the spot welding electrode head 3. When the fixed plate 44 moves downward, if the spot welding electrode head 3 retracts, the movable plate 41 moves with the spot welding electrode head 3. A fixed block 43 is fixedly connected to the upper surface of the movable plate 41. A locking block 46 is provided on one side of the fixed block 43. The movable plate 41 can synchronously drive the fixed block 43 to move upward. The locking block 46 can lock the fixed block 43. Thus, the height position of the spot welding electrode head 3 can be limited by the movable plate 41. The fumigation assembly includes fumigation hoods 52 symmetrically arranged on both sides of the spot welding electrode head 3. A suction pipe 521 is connected to the surface of the fumigation hood 52, and the other end of the suction pipe 521 is connected to the exhaust fan. The fumigation generated during spot welding can be collected, purified and discharged through the suction pipe 521 in conjunction with the fumigation hood 52, so as to prevent harmful fumes from affecting the health of the workers.

[0017] See Figure 4 and Figure 5 It is known that a spring is sleeved on the outer wall of the spot welding electrode head 3, and the spring is connected to the lower surface of the moving plate 41. The spring can prevent the spot welding electrode head 3 from rigidly contacting the heat sink and causing damage to the heat sink. A guide rod 42 is slidably connected to the side of the moving plate 41 away from the fixed block 43. The top end of the guide rod 42 is connected to the fixed plate 44. The guide rod 42 can limit the movement direction of the moving plate 41.

[0018] See Figure 4 - Figure 5 It is known that a fixing cover 45 is fixedly connected to the lower surface of the fixing plate 44, the locking block 46 is located on the inner wall of the fixing cover 45, the top of the fixing block 43 extends to the inner wall of the fixing cover 45, and a limiting plate 451 is fixedly connected to the inner wall of the fixing cover 45. The limiting plate 451 is located below the locking block 46 and is in contact with the locking block 46. The locking block 46 can be limited by the limiting plate 451, and then the moving plate 41 and the spot welding electrode head 3 can be limited by the locking block 46 in conjunction with the fixing block 43.

[0019] See Figure 6It is known that a groove 431 is provided on one side surface of the fixing block 43. When the locking block 46 is engaged with the inner wall of the groove 431, the spot welding electrode head 3 is within the normal pressure range. Multiple sets of slots 432 are provided on the surface of the fixing block 43 below the groove 431. The locking block 46 is engaged with the inner wall of the groove 431. During the movement, the locking block 46 engages with the slot 432. When the pressure generated when the spot welding electrode head 3 contacts the heat sink is too large, the fixing block 43 and the spot welding electrode head 3 move upward until the locking block 46 engages with the inner wall of the corresponding slot 432. This limits the position and height of the spot welding electrode head 3, which facilitates the subsequent spot welding operation on the heat sink.

[0020] See Figure 4 and Figure 7 It is known that slots 441 are provided at both ends of the fixing plate 44. The ends of the two sets of fume hoods 52 away from the spot welding electrode head 3 are connected to connecting rods 51. The top of the connecting rods 51 extends to the inner wall of the slots 441. The top of the fixing plate 44 is symmetrically provided with drive motors, and the output end of the drive motors extends to the inner wall of the slots 441 and is connected to the connecting rods 51. The drive motors drive the connecting rods 51 to rotate on the inner wall of the slots 441, which in turn drives the fume hoods 52 to swing back and forth on the outer wall of the spot welding electrode head 3, thereby facilitating the expansion of the fume hoods 52's fume fume fume fume fume fume fume fume fume fume fume fume 3 fume fume fume fume fume fume 3 fume fume fume fume fume 3 fume fume fume fume fume 3 fume fume fume fume 3 fume fume fume fume 3 fume fume fume fume 3 fume fume fume fume 3 fume fume fume fume 52 fume ...

[0021] See Figure 7 It is known that the end of the shaft of a set of smoke hoods 52 extends to the outer wall of the connecting rod 51 and is fixedly connected to an arc-shaped rod 53. An arc-shaped sleeve 54 is connected to one side surface of the connecting rod 51. The arc-shaped rod 53 is slidably connected to the inner wall of the arc-shaped sleeve 54. When the arc-shaped rod 53 extends out from the inner wall of the arc-shaped sleeve 54, it can cooperate with the shaft to drive the smoke hood 52 to rotate. Through the adaptive compensation of the angle of the smoke hood 52, the collection blank area caused by the height difference of different points can be reduced, and the overall smoke collection efficiency can be improved.

[0022] See Figure 4 and Figure 7 It is known that the top of the fixing block 43 is provided with a piston rod 56 on the inner wall of the fixing cover 45. The outer wall of the piston rod 56 is connected to a connecting pipe 55, which extends to the outside of the fixing cover 45 and is connected to the arc sleeve 54. When the spot welding electrode head 3 and the moving plate 41 move upward, the piston rod 56 can be squeezed simultaneously, and the hydraulic medium inside the piston rod 56 is squeezed into the cavity inside the arc sleeve 54 through the connecting pipe 55, thereby pushing the arc rod 53 to move and adjusting the angle of the fume hood 52.

[0023] The working principle of this invention is as follows: When performing spot welding on heat sinks, the lateral position of each group of guide heads 2 on the mounting plate 1 is first adjusted by the lateral drive assembly. The drive assembly includes a transmission screw with a continuous transmission thread on its outer wall. Through the screw drive, each group of guide heads 2 can be moved laterally along the mounting plate 1, thereby adjusting the lateral spacing between each group of spot welding electrode heads 3 to adapt to the spot welding requirements of heat sinks with different fin spacing and different weld point arrangements. After the lateral spacing of the spot welding electrode heads 3 is adjusted, the guide heads 2 drive the spot welding electrode heads 3 to make a vertical feed movement, moving them vertically downwards to close to the workpiece surface, thus completing the pre-positioning preparation for the formal spot welding operation. When the spot welding electrode head 3 moves down with the guide head 2 and comes into contact with the surface of the heat sink, due to the influence of the height deviation of the heat sink surface, each group of spot welding electrode heads 3 may not be able to contact the workpiece surface at the same time. Some spot welding electrode heads 3 corresponding to high welding points will contact the workpiece surface first. At this time, the guide head 2 drives the fixed plate 44 to continue to feed downward. The spot welding electrode head 3 that has contacted the workpiece is subjected to the reaction force of the workpiece, which drives the moving plate 41 to move upward. The outer wall of the spot welding electrode head 3 is sleeved with a spring. As the spot welding electrode head 3 contracts relatively, the spring is gradually compressed, and the contact pressure of the spot welding electrode head 3 increases accordingly. When the fixed block 43 moves upward relative to the moving plate 41 with the spot welding electrode head 3, the locking block 46 slides relative to the sliding groove 431. At this time, the spot welding electrode head 3 is in the normal welding pressure range. When the fixed plate 44 continues to move downward, after the contact pressure of some spot welding electrode heads 3 reaches the set range, under the elastic force of the torsion spring, the locking block 46 is locked into the corresponding height groove 432 one by one. When all the spot welding electrode heads 3 are in contact with the surface of the heat sink, the guide head 2 drives the fixed plate 44 to move upward as a whole. At this time, the locking block 46 is blocked by the inner wall limit plate 451 of the fixed cover 45 and forms a reverse locking with the groove 432, thereby locking the relative extension height of the fixed block 43 and the spot welding electrode head 3 in one direction. After the height locking is completed, the lower end face of each group of spot welding electrode heads 3 has adapted to the height difference of the workpiece surface to form a corresponding extension length. When the guide head 2 drives the spot welding electrode heads 3 to press down for the second time to perform the formal spot welding operation, all spot welding electrode heads 3 can simultaneously and stably adhere to the surface of the heat sink, and the welding pressure of each group is uniform and consistent. This avoids defects such as false welding and spurious welding caused by the suspension of the low electrode, and also prevents the workpiece from being crushed and the indentation from being too deep due to the overload of the high electrode pressure. This effectively improves the welding quality and structural reliability of the finished heat sink. After the spot welding operation is completed, when the guide head 2 drives the spot welding electrode heads 3 to reset, the electromagnetic block is energized by the wireless controller. The fixed block 43 can be attracted by the magnetic force, and the fixed block 43 can be moved to separate the card block 46 from the card slot 432, thereby releasing the lock of the card block 46 on the fixed block 43, so that the spot welding electrode head 3 can be reset, which is convenient for subsequent welding operations. During spot welding, fume hoods 52 are provided on both sides of the spot welding electrode head 3. The exhaust fan is connected to the fume hood 52 through the exhaust pipe 521. The metal fumes generated during spot welding are treated by the purification device and discharged in compliance with standards, preventing workers from inhaling harmful fumes and ensuring a safe production environment. Since the fume hood 52 is mounted on the fixed plate 44 through the connecting rod 51, and the fixed plate 44 has slots 441 at both ends, the connecting rod 51 can be driven by the drive motor to slide back and forth along the inner wall of the slot 441, so that the fume hood 52 swings back and forth slightly around the vertical axis of the spot welding electrode head 3, thereby widening the area for fume collection and improving the fume collection effect. When the moving plate 41 moves downward relative to the fixed block 43, the spot welding electrode head 3 contracts, and the upper end of the fixed block 43 simultaneously exerts a squeezing effect on the piston rod 56. The piston rod 56 squeezes the hydraulic medium in the cavity, causing the hydraulic medium to be transported through the connecting pipe 55 to the inner cavity of the arc-shaped sleeve 54. An arc-shaped rod 53 is fixedly connected to the end of the shaft of the fume hood 52. The arc-shaped rod 53 is slidably inserted into the arc-shaped sleeve 54. As the hydraulic medium is injected, the arc-shaped rod 53 extends along the arc-shaped cavity of the arc-shaped sleeve 54, thereby driving the fume hood. The greater the contraction of the spot welding electrode head 3, the higher the surface height of the workpiece at that point, and the greater the downward rotation angle of the fume hood 52. Due to the upward dispersion of the flue gas caused by the buoyancy of the heat, the capture blank area caused by the height difference of different points can be reduced through the adaptive compensation of the angles of the fume hoods 52 on both sides, so that the flue gas at high and low points can be effectively captured, significantly improving the overall flue gas capture efficiency. The contents not described in detail in this description are the prior art known to those skilled in the art.

[0024] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A multi-head resistance spot welding machine for plate heat sinks with adjustable spot welding spacing, comprising a mounting plate (1), characterized in that: Multiple sets of guide heads (2) are slidably connected to one side surface of the mounting plate (1). A spot welding electrode head (3) is provided at the bottom of the guide head (2). A locking component is provided above the spot welding electrode head (3) to limit its position. A smoke collection component is symmetrically provided on the outer wall of the spot welding electrode head (3). The locking assembly includes a fixed plate (44) fixedly connected to the lower part of the outer wall of the guide head (2), and a movable plate (41) sleeved on the outer wall of the spot welding electrode head (3) is provided below the fixed plate (44). A fixed block (43) is fixedly connected to the upper surface of the movable plate (41), and a locking block (46) is provided on one side of the fixed block (43). The fumigation assembly includes fumigation hoods (52) symmetrically arranged on both sides of the spot welding electrode head (3). A suction pipe (521) is connected to the surface of the fumigation hood (52), and the other end of the suction pipe (521) is connected to the air duct device.

2. The multi-head resistance spot welding machine for plate heat sinks with adjustable spot welding spacing according to claim 1, characterized in that: The outer wall of the spot welding electrode head (3) is fitted with a spring, and the spring is connected to the lower surface of the moving plate (41). A guide rod (42) is slidably connected to the side of the moving plate (41) away from the fixed block (43). The top end of the guide rod (42) is connected to the fixed plate (44).

3. The multi-head resistance spot welding machine for plate heat sinks with adjustable spot welding spacing according to claim 2, characterized in that: A fixing cover (45) is fixedly connected to the lower surface of the fixing plate (44). The locking block (46) is located on the inner wall of the fixing cover (45). The top of the fixing block (43) extends to the inner wall of the fixing cover (45). A limiting plate (451) is fixedly connected to the inner wall of the fixing cover (45). The limiting plate (451) is located below the locking block (46) and is in contact with the locking block (46).

4. The multi-head resistance spot welding machine for plate heat sinks with adjustable spot welding spacing according to claim 3, characterized in that: The fixed block (43) has a sliding groove (431) on one side surface. The fixed block (43) has multiple sets of slots (432) below the sliding groove (431) on its surface. The slot (46) is engaged with the inner wall of the sliding groove (431). The slot (46) engages with the slot (432) during movement.

5. A multi-head resistance spot welding machine for plate heat sinks with adjustable spot welding spacing according to claim 4, characterized in that: The fixed plate (44) has slots (441) at both ends. The two sets of fume hoods (52) are connected to a connecting rod (51) at the end away from the spot welding electrode head (3). The top of the connecting rod (51) extends to the inner wall of the slot (441). The fixed plate (44) has a drive motor symmetrically arranged at the top, and the output end of the drive motor extends to the inner wall of the slot (441) and is connected to the connecting rod (51).

6. A multi-head resistance spot welding machine for plate heat sinks with adjustable spot welding spacing according to claim 5, characterized in that: A set of the smoking hoods (52) has a shaft end that extends to the outer wall of the connecting rod (51) and is fixedly connected to an arc-shaped rod (53). An arc-shaped sleeve (54) is connected to one side surface of the connecting rod (51), and the arc-shaped rod (53) is slidably connected to the inner wall of the arc-shaped sleeve (54).

7. A multi-head resistance spot welding machine for plate heat sinks with adjustable spot welding spacing according to claim 6, characterized in that: The top of the fixing block (43) is located on the inner wall of the fixing cover (45) and a piston rod (56) is provided. The outer wall of the piston rod (56) is connected to a connecting pipe (55). The connecting pipe (55) extends to the outside of the fixing cover (45) and is connected to the arc sleeve (54).

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