Spot welding device for automobile parts

Abstract

The invention relates to a spot welding device for automobile parts. The spot welding device comprises a rack, a spot welding mechanism, a head end cleaning mechanism, a driving mechanism and a moving mechanism, the two spot welding mechanisms are coaxial and oppositely arranged. Each spot welding mechanism comprises a base, a spot welding head, a sleeve, a guide rod, a limiting block and a first elastic piece. The head end cleaning mechanisms and the spot welding mechanisms are arranged in a one-to-one correspondence mode. The head end cleaning mechanism comprises a first cleaning ring, a brush body, a pipe body, a baffle and a torsional spring. The driving mechanism drives the two bases to slide oppositely so as to perform spot welding on the automobile parts; and the moving mechanism drives the rack to move at intervals so as to perform spot welding on a plurality of point positions of the automobile parts. According to the device, through the design that pre-pressing is conducted firstly, then spot welding is conducted, and timely separation is conducted after spot welding, the contact time of a spot welding head and automobile accessories is shortened; after spot welding, welding slag is directly ground through the brush body, the cleanliness of the spot welding head is guaranteed, and the welding slag is prevented from affecting the subsequent spot welding effect.

Description

Technical Field

[0001] This invention relates to the field of spot welding technology for automotive parts, and more specifically to a spot welding device for automotive parts. Background Technology

[0002] Spot welding is generally divided into two main categories: double-sided spot welding and single-sided spot welding. In double-sided spot welding, electrodes feed current from both sides of the workpiece to the weld area. The typical double-sided spot welding method is the most commonly used, in which electrode indentations are present on both sides of the workpiece. Spot welding equipment is widely used in the welding process of automotive parts; the specific spot welding process is as follows: The workpiece joint is fed between the upper and lower welding heads of the spot welding machine and clamped; power is turned on, so that the contact surfaces of the two workpieces are heated and locally melted to form a weld nugget; after the power is turned off, pressure is maintained, so that the weld nugget cools and solidifies under pressure to form a weld spot; the pressure is removed, and spot welding is performed on the next spot.

[0003] In body spot welding operations, welding slag often adheres to the welding head during use. This slag tends to stick firmly to the surface of the welding head, and if not cleaned promptly, it can disrupt the effective contact between the welding head and the workpiece, leading to unstable welding current conduction and affecting weld quality. Therefore, the welding head must be regularly re-grinded. However, current re-grinding methods require removing the welding head from the welding clamp, re-grinding it, and then reinstalling it. This frequent disassembly and reassembly not only consumes a significant amount of production time and reduces the overall efficiency of body welding, but also may cause a decrease in the connection accuracy between the welding clamp and the welding head due to repeated disassembly and reassembly, further increasing equipment maintenance costs and the difficulty of quality control.

[0004] Secondly, during spot welding, to ensure a tight fit and stable welding at the joint of two workpieces, the spot welding head needs to apply a certain clamping pressure to the workpiece and maintain this pressure until the weld point cools and solidifies. This pressure-holding method has two main drawbacks. First, it keeps the spot welding head in close contact with the workpiece's welding area for an extended period, causing the welding slag generated during welding to be squeezed and adsorbed onto the surface of the spot welding head under pressure, further exacerbating the slag adhesion and increasing the difficulty of subsequent cleaning and grinding. Second, the continuous pressure application and holding process of the spot welding head on the workpiece completely occupies the operating time of the spot welding equipment. During this time, the equipment cannot perform welding operations at the next point, greatly extending the welding cycle of a single workpiece. Especially in scenarios involving continuous welding of multiple welding points on a car body, this time occupation significantly reduces the processing efficiency of the entire production line, making it difficult to meet the demands of large-volume, high-paced production. Summary of the Invention

[0005] In view of the above-mentioned problems in the existing technology, the technical problem to be solved by the present invention is: First, welding slag will stick to the spot welding head during use; second, the continuous pressure application and holding process of the spot welding head on the workpiece requires the entire operation time of the spot welding equipment, which greatly extends the welding cycle of a single workpiece.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a spot welding device for automotive parts, comprising: frame; A spot welding mechanism, comprising two coaxially arranged opposite each other, includes: a base, a spot welding head, a sleeve, a guide rod, a limiting block, and a first elastic element; the base is slidably mounted on the frame along the axial direction of the spot welding head; the spot welding head is mounted on the base; the sleeve is coaxially sleeved on the spot welding head; the guide rod slides through the base along the length direction of the spot welding head; a limiting block is installed at one end of the guide rod away from the spot welding head, and the other end of the guide rod is fixedly connected to the sleeve; the first elastic element applies an elastic force to the sleeve away from the limiting block; A head-end cleaning mechanism is provided, corresponding one-to-one with the spot welding mechanism; the head-end cleaning mechanism includes: a first cleaning ring, a brush body, a tube body, a baffle, and a torsion spring; the first cleaning ring is coaxially and rotatably installed inside the sleeve and sleeved on the spot welding head, and the outer wall of the first cleaning ring and the sleeve form a first annular cavity; the brush body is installed inside the first cleaning ring; the sleeve has an insertion hole along its length, one end of the insertion hole being located on the inner wall of the sleeve and at the end of the sleeve away from the guide rod; the tube body is arranged along the sliding direction of the base, and the tube body... One end of the tube is fixedly mounted on the base, and the other end of the tube is inserted into the socket on the sleeve. A baffle is hinged to one side of the tube located inside the socket, and a torsion spring applies a torque to the baffle to seal the end of the tube inside the socket. An exhaust hole is provided on the side wall of the tube. A connecting hole is also provided on the sleeve, which connects the socket and the first annular cavity. The connecting hole is located on the stroke of the exhaust hole, so as to connect the tube and the first annular cavity through the connecting hole and the exhaust hole, thereby driving the first cleaning ring to rotate through the gas. A drive mechanism drives the two bases to slide in opposite directions to spot weld automotive parts; and The moving mechanism drives the frame to move at intervals to perform spot welding on multiple points of the automotive parts.

[0007] Preferably, the first cleaning ring includes: an annular body and fan blades; a plurality of fan blades are installed in the circumferential direction on the outer side wall of the annular body, and the plurality of fan blades are located in the first annular cavity; the air pipe introduces gas in the tangential direction of the first annular cavity.

[0008] Preferably, the annular body has multiple through holes evenly distributed in the circumferential direction.

[0009] Preferably, the spot welding mechanism further includes: a second elastic element; the spot welding head is slidably mounted on the base along the sliding direction of the base; the second elastic element applies an elastic force to the spot welding head in the direction of the automotive parts.

[0010] Preferably, the driving mechanism includes: a bidirectional screw and a motor; the bidirectional screw is arranged along the sliding direction of the base and is rotatably mounted on the frame; the two bases are respectively threaded to both ends of the bidirectional screw; the motor drives the bidirectional screw to rotate.

[0011] Preferably, the moving mechanism includes a guide rail and a slide block; the slide block is slidably mounted on the guide rail, and the frame is fixedly mounted on the slide block.

[0012] Preferably, it also includes a workpiece cleaning mechanism that cleans the surface of the automotive parts to be welded.

[0013] Preferably, the workpiece cleaning mechanism includes: a second cleaning ring, an intermediate cleaning section, an elastic telescopic cleaning section, a rotating roller, a friction wheel, a pull rope, and a fixed pulley; the second cleaning ring has the same structure as the first cleaning ring; the second cleaning ring is coaxially and rotatably installed inside the sleeve, and the outer wall of the second cleaning ring and the sleeve form a second annular cavity; one end of the insertion hole on the inner wall of the sleeve communicates with the second annular cavity, thereby driving the second cleaning ring to rotate through gas; elastic telescopic cleaning sections are respectively provided at both ends of the intermediate cleaning section, and one end of the elastic telescopic cleaning section is connected to the intermediate cleaning section. One end of the elastic telescopic cleaning section is hinged, and the other end of the elastic telescopic cleaning section is hinged to the inner wall of the second cleaning ring; the rotating roller is rotatably mounted on the inner wall of the second cleaning ring, and the axis of the rotating roller is perpendicular to the axis of the second cleaning ring; the friction wheel is coaxially fixed with the rotating roller; the fixed pulley is mounted on the inner wall of the second cleaning ring and located below the rotating roller, and the fixed pulley, the intermediate cleaning section, and the elastic telescopic cleaning section are located on the same plane; one end of the pull rope is fixedly mounted on the intermediate cleaning section, and the other end of the pull rope passes around the fixed pulley and is fixedly mounted on the rotating roller.

[0014] Compared with the prior art, the present invention has at least the following advantages: 1. In this invention, the spot welding device has three main advantages: First, by pre-pressing before spot welding and separating promptly after spot welding, the contact time between the spot welding head and the automotive parts is reduced, which can reduce the risk of deformation of the parts due to heat, and at the same time reduce the wear of the spot welding head and extend its service life. Second, the dual pressure effect of pre-pressing and continuous pressure holding during separation improves the fit and welding stability of the automotive parts joints, and reduces defects such as false welds and incomplete welds. Third, after spot welding, the welding slag can be directly removed by brushing, without the need for additional cleaning procedures, simplifying the overall operation steps, while ensuring the cleanliness of the spot welding head and avoiding the welding slag from affecting the subsequent spot welding effect. The design of this gas pipe and its corresponding structure serves several purposes: First, the relative movement of the pipe body and sleeve allows for the switching between the connection hole and the exhaust hole, enabling the same gas source to automatically perform two functions in different processes: cleaning impurities on the surface of components before spot welding and driving the cleaning ring to grind the spot welding head after spot welding, without the need for an additional switching device. Second, the automatic opening and closing of the baffle is achieved through changes in gas pressure and the cooperation of a torsion spring, ensuring that the gas flows precisely to the target position in different processes, guaranteeing both the targeted nature of impurity cleaning and the stability of the cleaning ring drive. Third, the process of gas cleaning impurities is linked to the spot welding action, completing the cleaning before the spot welding head contacts the components, effectively reducing the impact of impurities on welding quality and improving spot welding reliability. Fourth, the insertion and connection method between the pipe body and the insertion hole allows the gas passage to switch with the relative movement of the base and the sleeve, reducing pipe entanglement or interference problems and improving the smoothness of device operation.

[0015] 2. In this invention, while the airflow drives the fan blades to rotate, the gas is blown through the through hole to the tip of the spot welding head, which can quickly reduce the temperature of the tip of the spot welding head, reduce the wear of the spot welding head caused by high temperature, and extend its service life. Moreover, the airflow can not only help to blow away the welding slag and debris generated by brush body grinding, reducing the accumulation of welding slag inside the device, but also cool down the spot welding head. One airflow achieves two functions, improving gas utilization efficiency and further optimizing the use effect of the device.

[0016] 3. In this invention, the elastic force of the second elastic element and the sliding design of the spot welding head allow the base to continue sliding after the spot welding head contacts the component, naturally extending the contact time between the spot welding head and the component. This ensures the full transfer of spot welding energy and the integrity of the welding process, reducing the problem of insufficient welding strength caused by insufficient contact time. Furthermore, the compression process of the second elastic element can buffer the impact force brought by the sliding of the base, avoiding rigid impact between the spot welding head and the component, reducing surface damage to the component and mechanical wear of the spot welding head. This structure can also adapt to automotive components of different thicknesses or with slight deformation. By compensating for the size differences of the components through the expansion and contraction of the second elastic element, it ensures that the spot welding head always maintains effective contact with the component, improving the adaptability of the device to components of different specifications.

[0017] 4. In this invention, after the sleeve abuts against the automotive part, the intermediate cleaning section and the elastic telescopic cleaning section simultaneously abut against the surface of the automotive part to be spot welded. The head of the spot welding head moves outward from the sleeve, and the connecting hole and the vent hole separate from each other. At this time, the gas inside the tube cannot be discharged through the vent hole, and the gas pressure inside the tube increases, overcoming the elastic torque of the torsion spring and pushing the baffle to rotate, so that the tube connects with the insertion hole through the end. The gas passes directly through the insertion hole to the second annular cavity inside the sleeve, and then drives the second cleaning ring to rotate. The second cleaning ring drives the intermediate cleaning section and the elastic telescopic cleaning section. The rotation of the welding head cleans impurities from the surface of the automotive parts. As the welding head moves outward from the sleeve, it comes into contact with the friction wheel. The movement of the welding head drives the friction wheel to rotate, which in turn drives the rotating roller to rotate. The rotating roller winds up the pull rope, which in turn pulls the middle cleaning section toward the edge of the inner wall of the second cleaning ring. The middle cleaning section applies a pulling force to the two elastic telescopic cleaning sections, causing them to extend and rotate, thus avoiding the welding head. The welding head can then perform spot welding on the surface of the automotive parts to be welded. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0019] Figure 1 This is a perspective view of a spot welding device for automotive parts provided in an embodiment of the present invention.

[0020] Figure 2 This is a cross-sectional view of the head-end cleaning mechanism provided in an embodiment of the present invention.

[0021] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0022] Figure 4 This is a perspective view of the cleaning ring provided in an embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram of the workpiece cleaning mechanism provided in an embodiment of the present invention.

[0024] Reference numerals: 1. Frame; 2. Spot welding mechanism; 21. Base; 22. Spot welding head; 23. Sleeve; 24. Guide rod; 25. Limiting block; 26. First elastic element; 27. Second elastic element; 3. Head end cleaning mechanism; 31. First cleaning ring; 311. Annular body; 312. Fan blade; 313. Through hole; 32. Brush body; 33. Tube body; 34. Baffle; 35. First annular cavity; 36. Exhaust hole; 37. Connecting hole; 38. Insertion hole; 4. Drive mechanism; 41. Bidirectional screw; 42. Motor; 5. Moving mechanism; 51. Guide rail; 52. Slide; 6. Workpiece cleaning mechanism; 61. Second cleaning ring; 62. Intermediate cleaning section; 63. Elastic telescopic cleaning section; 64. Rotating roller; 65. Friction wheel; 66. Pull rope; 67. Fixed pulley; 68. Second annular cavity. Detailed Implementation

[0025] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0026] See Figures 1-5The present invention provides an embodiment of a spot welding device for automotive parts, comprising: a frame 1, spot welding mechanisms 2, a head cleaning mechanism 3, a drive mechanism 4, and a moving mechanism 5; two spot welding mechanisms 2 are coaxially arranged and facing each other, and each spot welding mechanism 2 includes: a base 21, a spot welding head 22, a sleeve 23, a guide rod 24, a limiting block 25, and a first elastic element 26; the base 21 is slidably mounted on the frame 1 along the axial direction of the spot welding head 22; the spot welding head 22 is mounted on the base 21; the sleeve 23 is coaxially sleeved on the spot welding head 22; the guide rod 24 slides along the length direction of the spot welding head 22. The guide rod 24 passes through the base 21; and a limiting block 25 is installed at one end of the guide rod 24 away from the spot welding head 22, and the other end of the guide rod 24 is fixedly connected to the sleeve 23; the first elastic element 26 applies an elastic force to the sleeve 23 away from the limiting block 25; the head cleaning mechanism 3 is set one-to-one with the spot welding mechanism 2; the head cleaning mechanism 3 includes: a first cleaning ring 31, a brush body 32, a tube body 33, a baffle 34 and a torsion spring; the first cleaning ring 31 is coaxially and rotatably installed inside the sleeve 23 and sleeved on the spot welding head 22, and the outer wall of the first cleaning ring 31 and the sleeve 23 form a... A first annular cavity 35; a brush body 32 is installed inside a first cleaning ring 31; a sleeve 23 has an insertion hole 38 along its length, one end of which is located on the inner wall of the sleeve 23 and at the end of the sleeve 23 away from the guide rod 24; a tube 33 is arranged along the sliding direction of the base 21, and one end of the tube 33 is fixedly installed on the base 21, while the other end of the tube 33 is inserted into the insertion hole 38 on the sleeve 23; a baffle 34 is hinged to one side of the tube 33 at the end inside the insertion hole 38, and a torsion spring applies a torque to the baffle 34 to seal the tube. 33 is located at one end inside the insertion hole 38; an exhaust hole 36 is provided on the side wall of the tube body 33; a connecting hole 37 is also provided on the sleeve 23, the connecting hole 37 connects the insertion hole 38 and the first annular cavity 35; the connecting hole 37 is located on the stroke of the exhaust hole 36, so as to connect the tube body 33 and the first annular cavity 35 through the connecting hole 37 and the exhaust hole 36, and then drive the first cleaning ring 31 to rotate through the gas; the driving mechanism 4 drives the two bases 21 to slide in opposite directions to spot weld the automotive parts; the moving mechanism 5 drives the frame 1 to move at intervals to spot weld multiple points of the automotive parts.

[0027] In practice, the automotive parts to be spot-welded are first fixed, and then the moving mechanism 5 is controlled to move. The moving mechanism 5 drives the frame 1 to move at intervals, precisely moving the spot welding mechanism 2 to the first spot welding position. Then, the drive mechanism 4 is controlled to move, driving the two bases 21 to slide in opposite directions, driving the two spot welding heads 22 to move in opposite directions synchronously. During this process, the bases 21 first drive the sleeve 23 to abut against the surface of the automotive parts to apply pre-pressure. Then, the bases 21 continue to move against the elastic force of the first elastic element 26, allowing the first elastic element 26 to store energy. At the same time, the guide rod 24 slides along the bases 21 until the spot welding head 22 precisely abuts against the spot welding position and completes the spot welding operation, reducing the contact time between the spot welding head 22 and the automotive parts. After the spot welding is completed, the drive mechanism 4 drives the two bases 21 to move in opposite directions, causing the spot welding head 22 to separate from the automotive parts. At this time, the first elastic element 26 releases its elastic force, driving the sleeve 23 to continue to apply pressure to the automotive parts, ensuring that the joint of the two automotive parts is always tightly fitted, ensuring welding stability. The end of the tube 33 furthest from the baffle 34 is the air inlet, continuously supplying gas into the tube 33. When the sleeve 23 abuts against the automotive part, the tip of the spot welding head 22 moves outward from the sleeve 23 (i.e., during the process of spot welding head 22 about to begin spot welding). The connecting hole 37 and the exhaust hole 36 separate. At this time, the gas inside the tube 33 cannot be discharged through the exhaust hole 36, and the internal air pressure of the tube 33 increases. This overcomes the elastic torque of the torsion spring and pushes the baffle 34 to rotate, allowing the tube 33 to connect with the insertion hole 38 at its end. The gas then passes directly through the insertion hole 38 to the surface of the automotive part inside the sleeve 23, cleaning dust and other impurities on the automotive part to reduce [gas pressure]. Surface impurities interfere with spot welding; after spot welding head 22 completes spot welding, its head moves toward the inside of sleeve 23. When the head of spot welding head 22 moves into the first cleaning ring 31, the connecting hole 37 coincides with the exhaust hole 36. At this time, the gas in the tube 33 can flow into the first annular cavity 35 through the exhaust hole 36 and the connecting hole 37. The gas pressure at the end of the tube 33 drops significantly. The elastic torque of the torsion spring pushes the baffle 34 to reset, sealing the end of the tube 33. All the gas in the tube 33 is then introduced into the first annular cavity 35 through the connecting hole 37 and the exhaust hole 36, driving the first cleaning ring 31 to rotate, thus achieving the grinding treatment of the head of spot welding head 22.

[0028] See Figures 1-5 In other embodiments, the first cleaning ring 31 includes: an annular body 311 and fan blades 312; a plurality of fan blades 312 are installed in the circumferential direction on the outer side wall of the annular body 311, and the plurality of fan blades 312 are located in the first annular cavity 35; gas is introduced into the tangential direction of the air pipe in the first annular cavity 35.

[0029] In specific implementation, when it is necessary to control the rotation of the first cleaning ring 31 to grind the spot welding head 22, the gas pipe is introduced into the gas pipe along the tangential direction of the first annular cavity 35. Due to the tangential air intake design, the airflow entering the first annular cavity 35 directly acts on the multiple fan blades 312 installed circumferentially on the outer wall of the annular body 311, pushing the fan blades 312 to rotate around the axis of the annular body 311. The fan blades 312 are fixedly connected to the annular body 311, thereby driving the annular body 311 to rotate synchronously, so that the brush body 32 installed in the annular body 311 rotates together with the annular body 311, thereby realizing the grinding treatment of the welding slag adhering to the spot welding head 22.

[0030] Furthermore, the annular body 311 has multiple through holes 313 evenly distributed in the circumferential direction. During the long-term continuous spot welding process, the spot welding head 22 will experience a rapid increase in temperature due to the continuous accumulation of resistance heat and arc heat between the electrode and the workpiece. Excessive temperature will change the metal structure of the spot welding head 22, causing it to soften and deform, which will not only shorten the service life of the spot welding head 22, but also have a potential impact on the reliability and safety of the vehicle body welding. Therefore, the gas in the first annular cavity 35 will also be blown directly to the head end of the spot welding head 22 located in the first cleaning ring 31 through the multiple through holes 313 evenly distributed in the circumferential direction, to cool down the head end of the spot welding head 22 that has just completed the spot welding operation.

[0031] See Figures 1-5 In other embodiments, the spot welding mechanism 2 further includes: a second elastic element 27; a spot welding head 22 slidably mounted on the base 21 along the sliding direction of the base 21; and the second elastic element 27 applying a spring force to the spot welding head 22 in the direction of the automotive part. Specifically, when the drive mechanism 4 drives the base 21 to slide towards the automotive part, because the spot welding head 22 is slidably mounted along the sliding direction of the base 21 and the second elastic element 27 applies a spring force to the spot welding head 22 in the direction of the automotive part, the spot welding head 22 will first contact the automotive part; the base 21 continues to slide under the action of the drive mechanism 4, at which time the second elastic element 27 is compressed and stores force, while the spot welding head 22 remains relatively stationary because it has already contacted the automotive part, allowing the base 21 to continue sliding a distance relative to the spot welding head 22. During this process, the spot welding head 22 remains in contact with the automotive part at the welding position, extending the contact time between the spot welding head 22 and the part to ensure sufficient welding.

[0032] See Figures 1-5In other embodiments, the drive mechanism 4 includes a bidirectional screw 41 and a motor 42. The bidirectional screw 41 is arranged along the sliding direction of the base 21 and is rotatably mounted on the frame 1. The two bases 21 are threadedly connected to both ends of the bidirectional screw 41. The motor 42 drives the bidirectional screw 41 to rotate. In specific implementation, after the motor 42 starts, it drives the bidirectional screw 41 to rotate on the frame 1. Since the two bases 21 are threadedly connected to both ends of the bidirectional screw 41 and the threads at both ends of the bidirectional screw 41 rotate in opposite directions, when the screw rotates, the two bases 21 will slide synchronously in opposite directions along the axial direction of the bidirectional screw 41. When welding is required at the spot welding position, the motor 42 drives the bidirectional screw 41 to rotate in the forward direction, and the two bases 21 drive the spot welding head 22 to move synchronously in opposite directions to achieve welding. After welding is completed, the motor 42 drives the bidirectional screw 41 to rotate in the reverse direction, and the two bases 21 drive the spot welding head 22 to move synchronously in the opposite direction to achieve separation.

[0033] See Figures 1-5 In other embodiments, the moving mechanism 5 includes a guide rail 51 and a slide 52; the slide 52 is slidably mounted on the guide rail 51, and the frame 1 is fixedly mounted on the slide 52.

[0034] In practice, the moving mechanism 5 achieves the intermittent movement of the frame 1 through the cooperation of the guide rail 51 and the slide 52: the guide rail 51 is fixedly set along the distribution direction of multiple spot welding points on the automotive parts; when it is necessary to switch the spot welding position, the slide 52 slides smoothly along the extension direction of the guide rail 51, driving the frame 1 and the spot welding mechanism 2, head cleaning mechanism 3, etc. on the frame 1 to move synchronously; after the slide 52 drives the frame 1 to move so that the spot welding mechanism 2 is aligned with the next spot welding point, the slide 52 completes the positioning on the guide rail 51 to ensure the accurate position of the spot welding mechanism 2, and then the drive mechanism 4 can be started to carry out the spot welding operation at that point; throughout the movement process, the guide rail 51 provides stable guidance for the slide 52, and the slide 52 provides a stable mounting and moving carrier for the frame 1.

[0035] See Figures 1-5 In another embodiment, a workpiece cleaning mechanism 6 is also included, which cleans the surface of the automotive parts to be welded. By providing the workpiece cleaning mechanism 6, impurities on the surface of the automotive parts can be removed, thereby effectively preventing impurities from interfering with the spot welding.

[0036] Furthermore, the workpiece cleaning mechanism 6 includes: a second cleaning ring 61, an intermediate cleaning section 62, an elastic telescopic cleaning section 63, a rotating roller 64, a friction wheel 65, a pull rope 66, and a fixed pulley 67; the second cleaning ring 61 has the same structure as the first cleaning ring 31; the second cleaning ring 61 is coaxially and rotatably installed inside the sleeve 23, and the outer wall of the second cleaning ring 61 and the sleeve 23 form a second annular cavity 68; one end of the insertion hole 38 on the inner wall of the sleeve 23 communicates with the second annular cavity 68, thereby driving the second cleaning ring 61 to rotate through gas; the two ends of the intermediate cleaning section 62 are respectively provided with elastic telescopic cleaning sections 63, and one end of the elastic telescopic cleaning section 63... One end of the intermediate cleaning section 62 is hinged to the other end of the elastic telescopic cleaning section 63, which is hinged to the inner wall of the second cleaning ring 61. The rotating roller 64 is rotatably mounted on the inner wall of the second cleaning ring 61, and the axis of the rotating roller 64 is perpendicular to the axis of the second cleaning ring 61. The friction wheel 65 is coaxially fixed with the rotating roller 64. The fixed pulley 67 is mounted on the inner wall of the second cleaning ring 61 and located below the rotating roller 64. The fixed pulley 67, the intermediate cleaning section 62, and the elastic telescopic cleaning section 63 are located on the same plane. One end of the pull rope 66 is fixedly mounted on the intermediate cleaning section 62, and the other end of the pull rope 66 is fixedly mounted on the rotating roller 64 after passing over the fixed pulley 67.

[0037] In practice, after the sleeve 23 abuts against the automotive part, the intermediate cleaning section 62 and the elastic telescopic cleaning section 63 simultaneously abut against the surface of the automotive part to be spot welded. The head of the spot welding head 22 moves outward from the sleeve 23, and the connecting hole 37 and the vent hole 36 separate. At this time, the gas in the tube 33 cannot be discharged through the vent hole 36, and the gas pressure inside the tube 33 increases, overcoming the elastic torque of the torsion spring and pushing the baffle 34 to rotate, so that the tube 33 is connected to the insertion hole 38 through the end. The gas passes directly through the insertion hole 38 to the second annular cavity 68 inside the sleeve 23, and then drives the second cleaning ring 61 to rotate. The second cleaning ring 61 drives the intermediate cleaning section 62 and the elastic telescopic cleaning section 63 to rotate. The welding head 22 rotates, thereby cleaning impurities from the surface of the automotive parts. As the head of the welding head 22 moves outward from the sleeve 23, the welding head 22 comes into contact with the friction wheel 65. The movement of the welding head 22 drives the friction wheel 65 to rotate through friction. The friction wheel 65 drives the rotating roller 64 to rotate. The rotating roller 64 winds up the pull rope 66, thereby pulling the intermediate cleaning section 62 toward the edge of the inner wall of the second cleaning ring 61. The intermediate cleaning section 62 applies a pulling force to the two elastic telescopic cleaning sections 63, causing the elastic telescopic cleaning sections 63 to extend and rotate, thus avoiding the welding head 22. The welding head 22 can then perform spot welding on the surface of the automotive parts to be spot welded.

[0038] 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 spot welding device for automotive parts, characterized in that, include: frame; A spot welding mechanism, comprising two coaxially arranged opposite each other, includes: a base, a spot welding head, a sleeve, a guide rod, a limiting block, and a first elastic element; the base is slidably mounted on the frame along the axial direction of the spot welding head; the spot welding head is mounted on the base; the sleeve is coaxially sleeved on the spot welding head; the guide rod slides through the base along the length direction of the spot welding head; a limiting block is installed at one end of the guide rod away from the spot welding head, and the other end of the guide rod is fixedly connected to the sleeve; the first elastic element applies an elastic force to the sleeve away from the limiting block; A head-end cleaning mechanism is provided, corresponding one-to-one with the spot welding mechanism; the head-end cleaning mechanism includes: a first cleaning ring, a brush body, a tube body, a baffle, and a torsion spring; the first cleaning ring is coaxially and rotatably installed inside the sleeve and sleeved on the spot welding head, and the outer wall of the first cleaning ring and the sleeve form a first annular cavity; the brush body is installed inside the first cleaning ring; the sleeve has an insertion hole along its length, one end of the insertion hole being located on the inner wall of the sleeve and at the end of the sleeve away from the guide rod; the tube body is arranged along the sliding direction of the base, and the tube body... One end of the tube is fixedly mounted on the base, and the other end of the tube is inserted into the socket on the sleeve. A baffle is hinged to one side of the tube located inside the socket, and a torsion spring applies a torque to the baffle to seal the end of the tube inside the socket. An exhaust hole is provided on the side wall of the tube. A connecting hole is also provided on the sleeve, which connects the socket and the first annular cavity. The connecting hole is located on the stroke of the exhaust hole, so as to connect the tube and the first annular cavity through the connecting hole and the exhaust hole, thereby driving the first cleaning ring to rotate through the gas. A drive mechanism drives the two bases to slide in opposite directions to spot weld automotive parts; and The moving mechanism drives the frame to move at intervals to perform spot welding on multiple points of the automotive parts.

2. The spot welding device for automotive parts according to claim 1, characterized in that, The first cleaning ring includes: an annular body and fan blades; multiple fan blades are installed in the circumferential direction on the outer side wall of the annular body, and the multiple fan blades are located in the first annular cavity; the air pipe introduces gas in the tangential direction of the first annular cavity.

3. The spot welding device for automotive parts according to claim 2, characterized in that, The annular body has multiple through holes evenly distributed in the circumferential direction.

4. The spot welding device for automotive parts according to claim 1, characterized in that, The spot welding mechanism further includes: a second elastic element; the spot welding head is slidably mounted on the base along the sliding direction of the base; the second elastic element applies an elastic force to the spot welding head in the direction of the automotive parts.

5. The spot welding device for automotive parts according to claim 1, characterized in that, The driving mechanism includes a bidirectional screw and a motor; the bidirectional screw is arranged along the sliding direction of the base and is rotatably mounted on the frame; the two bases are respectively threaded to both ends of the bidirectional screw; the motor drives the bidirectional screw to rotate.

6. The spot welding device for automotive parts according to claim 1, characterized in that, The moving mechanism includes a guide rail and a slide block; the slide block is slidably mounted on the guide rail, and the frame is fixedly mounted on the slide block.

7. The spot welding device for automotive parts according to claim 1, characterized in that, It also includes a workpiece cleaning mechanism that cleans the surfaces of the automotive parts to be welded.

8. The spot welding device for automotive parts according to claim 7, characterized in that, The workpiece cleaning mechanism includes: a second cleaning ring, an intermediate cleaning section, an elastic telescopic cleaning section, a rotating roller, a friction wheel, a pull rope, and a fixed pulley; the second cleaning ring has the same structure as the first cleaning ring; the second cleaning ring is coaxially and rotatably installed inside the sleeve, and the outer wall of the second cleaning ring and the sleeve form a second annular cavity; one end of the insertion hole on the inner wall of the sleeve communicates with the second annular cavity, thereby driving the second cleaning ring to rotate through gas; elastic telescopic cleaning sections are respectively provided at both ends of the intermediate cleaning section, and one end of the elastic telescopic cleaning section is connected to one end of the intermediate cleaning section. The first cleaning section is hinged at one end, and the other end of the elastic telescopic cleaning section is hinged to the inner wall of the second cleaning ring. The rotating roller is rotatably mounted on the inner wall of the second cleaning ring, and the axis of the rotating roller is perpendicular to the axis of the second cleaning ring. The friction wheel is coaxially fixed with the rotating roller. The fixed pulley is mounted on the inner wall of the second cleaning ring and located below the rotating roller, and the fixed pulley, the intermediate cleaning section, and the elastic telescopic cleaning section are located on the same plane. One end of the pull rope is fixedly mounted on the intermediate cleaning section, and the other end of the pull rope passes around the fixed pulley and is fixedly mounted on the rotating roller.

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