A double-sided welding device for metal paint can connecting joints and a welding method thereof

Abstract

The present application belongs to the technical field of metal paint can welding, and particularly relates to a metal paint can connecting joint double-sided welding device and a welding method thereof, which comprises a feeding and forming unit, a conveying chain group arranged at the bottom of the feeding and forming unit and used for driving the movement of a push block, the feeding and forming unit is used for curling a first material into a second material, and the second material is pushed by the push block to move horizontally inside a material guiding assembly, the material guiding assembly is used for driving the two ends of the second material to be misaligned and superimposed, and then to move between an upper guide wheel and a lower guide wheel of a welding part; a closed loop copper wire is sleeved between the upper guide wheel and the lower guide wheel, and a plurality of guide wheels for guiding are arranged between the upper guide wheel and the lower guide wheel. Through the cooperation of the welding part and the feeding and forming unit, the welding efficiency of the metal paint can connecting joint is effectively improved, and the problems of the existing welding device, such as the inability to mass-produce, the deformation and damage of the can body during the welding process, and the low welding precision, are solved.

Description

Technical Field

[0001] This invention belongs to the field of metal paint can welding technology, specifically relating to a double-sided welding device and welding method for metal paint can joints. Background Technology

[0002] Metal paint cans typically consist of a body, a bottom, and a lid. The body is formed by rolling thin metal sheets (such as tinplate) into a circle and then welding them together with butt joints or lap joints. Because paint cans need to be well-sealed to prevent solvent evaporation and leakage of contents, the welding quality of the joints in the body is crucial.

[0003] Problems with existing technology: Currently available metal paint can welding equipment typically only welds one side of the can body. This method is not suitable for mass production of metal paint cans and greatly affects the production efficiency of metal paint cans.

[0004] Currently, when welding the body of a metal paint can, it is usually necessary to overlap the two ends of the can. However, the existing overlap control methods mostly use mechanical clamping. In actual use, this method is prone to causing deformation and damage to the thin-walled can body, thus affecting the finished product of the metal paint can welding.

[0005] The existing metal paint can body is usually formed and welded using two separate machines. However, deformation can easily occur during the transfer of the rolled and formed can body, which can lead to deviations in welding accuracy and reduce the production efficiency of metal paint cans. Summary of the Invention

[0006] The purpose of this invention is to provide a double-sided welding device and welding method for the joint seam of metal paint cans. By cooperating with the welding part and the feeding and forming unit, the welding efficiency of the joint seam of metal paint cans is effectively improved, and the problems of existing welding devices being unable to be mass-produced, the can body being easily deformed and damaged during the welding process, and the low welding precision are solved.

[0007] The specific technical solution adopted by this invention is as follows: A double-sided welding device and welding method for the joint of a metal paint can, comprising a feeding and forming unit and a conveyor chain set disposed at the bottom of the feeding and forming unit for driving the pusher block to move. The feeding and forming unit is used to curl a first material into a second material and push the second material to move horizontally inside the guide assembly through the pusher block. The guide assembly is used to drive the two ends of the second material to overlap in a staggered manner and move to the space between the upper guide wheel and the lower guide wheel of the welding part. A closed loop copper wire is sleeved between an upper guide wheel and a lower guide wheel. Multiple guide wheels for guiding are also provided between the upper and lower guide wheels, as well as a tensioning wheel group for adjusting the tension of the copper wire, so that the copper wire forms a closed loop with two arc-shaped sections inside the upper and lower guide wheels. The second material to be welded is placed between the closed loops of the upper and lower arc-shaped sections. The copper wire rotates under the drive of the upper guide wheel. The upper and lower arc-shaped sections of the copper wire are pressed against the inner and outer walls of the second material. The contact resistance between the copper wire and the second material generates resistance heat to melt the second material. The first cylinder pushes the lower guide wheel to apply welding pressure for double-sided continuous resistance seam welding of the longitudinal seam of the second material.

[0008] The feeding and forming unit includes a mounting platform set on the top of the frame, and a lifting frame set on one side of the mounting platform is used to push the first material to move vertically, so that one end of the first material moves to one side of the guide plate; A forming component is fixedly installed on the top of the mounting platform. A material suction component fixedly installed on the top of the forming component is used to lift one end of the first material, so that the lifted end of the first material moves to the top of the guide plate.

[0009] The molding assembly includes a housing fixedly mounted on the top of the mounting platform, and a second motor mounted on one side of the housing for driving the gear set to rotate; The gear set is used to drive the two sets of forming rollers to rotate, and the forming rollers are provided in three sets and arranged in an inverted triangular shape, which are used to curl the first material into the second material. The two ends of the bottom forming roller are threaded to the outer shell through bearing seats and adjusting screws.

[0010] The molding assembly also includes a limiting cylinder disposed below the outer shell, with a lower limiting plate concentrically arranged below the limiting cylinder, and side limiting plates fixedly installed on both sides of the outer shell to limit the movement trajectory of the first material, so that the first material after being rolled is sleeved on the surface of the limiting cylinder. The lower limit plate is located inside the fixed frame, and the conveyor chain assembly installed inside the fixed frame drives the pusher block to move linearly, so that the pusher block passes through the outer shell and the lower limit plate, and pushes the second material to move linearly.

[0011] The limiting cylinder is provided with an upper limiting roller frame and a lower limiting roller frame on one side. The upper limiting roller frame and the lower limiting roller frame form a cage-type guide structure, which allows the pusher to push the second material to move in the cage-type guide structure to the bottom of the welding part for welding. The welded second material is then transported to the next process by the conveying roller group provided on one side of the upper limiting roller frame. The upper limit roller frame is used to drive the material guide assembly to be fixedly installed with the frame. The bottom of the material guide assembly is fixedly installed with a fixing seat for guiding the copper wire welded inside the second material.

[0012] The lower guide wheel is located inside the fixed base, and a first cylinder fixedly installed inside the fixed base is used to drive the lower guide wheel to move vertically; The fixed base has a conductive wheel with copper wire for conducting electricity rotatably mounted inside. One end of the conductive wheel is provided with a conductive slip ring. The inner wall of the fixed base is provided with a carbon brush assembly that slides in contact with the conductive slip ring. The carbon brush assembly is connected to an external power source through a wire to supply power to the rotating copper wire.

[0013] A guide plate is fixedly installed on the top of the fixed base. A first clamping part and a second clamping part are provided on one side of the guide plate. An electromagnet with the N pole facing down is provided inside the first clamping part, and an electromagnet with the N pole facing up is provided inside the second clamping part. When the second material passes through the first clamping part and the second clamping part, the magnetic attraction between the electromagnet and the inner and outer walls of the second material causes the pressing rollers of the first clamping part and the second clamping part to move towards each other and are used to press and close the outer and inner walls of the second material. A guide frame for guiding the second material is fixedly installed on one side of the guide plate. A first guide groove and a second guide groove are respectively provided on both sides of the guide frame. The first guide groove is connected to the first guide groove, and the second guide groove is connected to the second guide groove, so that the two ends of the second material move inside the first guide groove and the second guide groove respectively.

[0014] The suction assembly includes a mounting base, on one side of which a second cylinder is hinged. The second cylinder is used to drive the connecting base and the card seat to move in a fan-shaped motion. The connecting base is hinged to the top of the housing via a hinged seat on its side. The card holder is used to drive the pneumatic suction cup to the top of the first material, and to suck the upper surface of the first material through the pneumatic suction cup, and to move one end of the first material into the inside of the shell. The forming component drives the conveying roller to rotate, so that the first material moves into the inside of the forming roller and is rolled into a cylindrical shape by the rotation of the forming roller.

[0015] A feeding assembly is provided on the top of the first material, and the feeding assembly is mounted to the frame via a mounting block; The feeding assembly includes a third cylinder hinged to one side of the frame. The third cylinder drives the frame to move vertically through a fixed rod, causing the frame to roll into contact with the first material and push the first material to move linearly.

[0016] A method for double-sided welding of the joint seam of a metal paint can includes the following steps: Feeding and conveying: The first material, after being cut, is stacked on the top of the lifting frame. Through the coordinated action of the feeding wheel and the suction component, the first material is separated sheet by sheet and conveyed to the forming component. Roll forming: The first material is introduced into the forming roller by the rotation of the conveying roller, and the first material in the flat shape is continuously rolled into the second material in the cylindrical shape by the rotation and extrusion of the forming roller. Positioning and feeding: The pusher blocks on the conveyor chain are driven to move by the operation of the conveyor chain group, pushing the cylindrical second material blank along the axis so that it passes through the limiting cylinder and enters the inside of the guide assembly. The overlap length of the two ends of the second material is precisely controlled by the guide assembly to prepare for the joint. Overlap and closure: When the second material passes through the channel formed by the first clamping part and the second clamping part, the magnetic attraction force generated by the electromagnet acts on the inner and outer walls of the blank, and with the cooperation of the clamping roller, the two ends of the second material are tightly closed to form an overlap seam to be welded. Longitudinal seam welding: The first motor is started, driving the upper and lower guide wheels to rotate synchronously, causing the copper wire tensioned between them to circulate; at the same time, the first cylinder drives the lower guide wheel to move upward, applying a predetermined welding pressure, so that the upper and lower arc-shaped parts of the copper wire are tightly pressed against the inner and outer walls of the second material overlap joint; and through an external power source, electricity is supplied to the conductive wheel in contact with the copper wire, causing the copper wire to heat up, and the overlap joint of the second material is melted and connected by resistance heat, realizing continuous resistance welding of the longitudinal seam of the tank body as the copper wire rotates continuously; Material feeding: The second material, after welding, is conveyed to the next process for processing by a set of conveying rollers installed inside the fixed frame.

[0017] The technical effects achieved by this invention are as follows: This invention utilizes multiple guide wheels rotatably mounted on the front of the frame. These guide wheels, along with an upper guide wheel, a lower guide wheel, and a conductive wheel, form a closed-loop copper wire roller assembly. The upper and lower guide wheels allow the upper and lower arc-shaped sections of the copper wire to press against the outer and inner walls of a second material. A first cylinder drives the lower guide wheel vertically, applying a predetermined welding pressure based on the thickness of the second material. An external power source energizes the conductive wheel, energizing the copper wire and creating a backflow. The contact resistance between the copper wire and the outer and inner walls of the second material generates resistive heat, melting the contact surface between the second material and the copper wire. This resistive welding of the overlapping portions of the second material's ends is achieved through the rotation of the copper wire, resulting in continuous double-sided welding. This method is more efficient than existing single-sided welding and is suitable for welding large quantities of metal paint can bodies.

[0018] This invention features a material guiding assembly inside a fixed frame. The material guiding assembly has a first and a second material guiding groove on both sides of its guiding plate, which are connected to the first and second guiding grooves of a guide frame. Since the guide frame is located on one side of the feeding and forming unit, the two ends of the rolled second material can enter the first and second guiding grooves respectively. Both the first and second guiding grooves are inclined, and their vertical heights overlap, which is the overlap length of the second material. The material guiding assembly adopts a modular design and is fixed to the fixed seat and upper limit roller frame with bolts. Therefore, during actual welding, a suitable material guiding assembly can be replaced according to the can body processing requirements. Compared to existing mechanical clamping, it does not damage the rolled second material and improves the finished product effect of the metal paint can body welding. Furthermore, with the combined action of the first and second clamping parts, the two ends of the second material are rolled, clamped, and closed before welding, further improving the welding quality.

[0019] This invention features an installation platform mounted on one side of a fixed frame, and a lifting frame on one side of the installation platform. The lifting frame can vertically move the neatly stacked first material to one side of the forming component. A feeding component is fixedly mounted on one side of the frame via an installation block, and a suction component is mounted on the top of the forming component. By activating a second cylinder, the connecting seat can move a pneumatic suction cup to the top of the first material. The activation of the pneumatic suction cup generates suction, which, through the extension of the second cylinder, sends the end of the first material to the top of the guide plate. Activation of the feeding wheel pushes the first material into the interior of the forming component, and it is then fed to the forming roller via a conveyor roller to be rolled into a second material. The second material is then sent to the welding section for welding processing under the action of the conveyor chain and pusher block. Therefore, this device integrates the forming and welding of the metal paint can body into one unit, avoiding precision errors caused by intermediate transfer, thereby improving welding accuracy and finished product quality. Attached Figure Description

[0020] Figure 1 This is a perspective view of the overall installation structure of the present invention; Figure 2 This is a schematic diagram of the installation structure of the feeding and forming unit in this invention; Figure 3 This is the present invention. Figure 2 Enlarged schematic diagram of the structure at point A in the middle; Figure 4 This is a schematic diagram of the welding part installation structure in this invention; Figure 5 This is a schematic diagram of the welding part and the material guiding assembly in this invention; Figure 6This is a schematic diagram of the specific structure of the welding part in this invention; Figure 7 This is a schematic diagram of the specific structure of the feeding and forming unit in this invention; Figure 8 This is a schematic diagram of the molding component structure in this invention; Figure 9 This is a schematic diagram of the forming roller installation structure in this invention; Figure 10 This is a schematic diagram of the material suction assembly structure in this invention; Figure 11 This is a schematic diagram of the feeding component structure in this invention; Figure 12 This is a schematic diagram of the installation structure of the first clamping part and the second clamping part in this invention; Figure 13 This is a schematic diagram of the working state structure of the first clamping part and the second clamping part in this invention; Figure 14 This is a schematic diagram of the disassembled guide frame structure in this invention; Figure 15 This is a flowchart of the double-sided welding method for the joint of a metal paint can in this invention; Figure 16 This is a flowchart of the longitudinal seam welding process in this invention.

[0021] The attached diagram lists the components represented by each number as follows: 1. Frame; 2. Protective cover; 3. Welding section; 31. First motor; 32. Upper guide wheel; 33. First cylinder; 34. Lower guide wheel; 35. Tensioning wheel assembly; 36. Guide wheel; 37. Copper wire; 38. Conductive wheel; 4. Feeding and forming unit; 41. Mounting platform; 42. Lifting frame; 43. Molding component; 431. Housing; 432. Second motor; 433. Lower limit plate; 434. Limiting cylinder; 435. Gear set; 436. Molding roller; 437. Side limit plate; 44. Suction assembly; 441. Mounting base; 442. Second cylinder; 443. Connecting base; 444. Card holder; 445. Pneumatic suction cup; 45. Feeding assembly; 451. Frame; 452. Fixing rod; 453. Feeding wheel; 455. Third cylinder; 46. ​​First material; 47. Mounting block; 48. Conveyor roller; 49. Guide plate; 5. Upper limit roller frame; 6. Fixing frame; 7. Lower limit roller frame; 8. Material guiding assembly; 81. Material guiding plate; 811. First material guiding groove; 812. Second material guiding groove; 82. First clamping part; 821. Mounting plate; 822. Electromagnet; 823. Pressure roller; 83. Second clamping part; 84. Guide rod; 85. Guide frame; 851. First guide groove; 852. Second guide groove; 9. Fixed base; 10. Second material; 11. Air-cooled structure; 12. Conveyor chain assembly; 13. Push block; 14. Conveyor roller assembly. Detailed Implementation

[0022] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0023] like Figure 1-14 As shown, a double-sided welding device and welding method for the joint of a metal paint can includes a feeding and forming unit 4 and a conveying chain group 12 set at the bottom of the feeding and forming unit 4 for driving the push block 13 to move. The conveying chain group 12 consists of a square chain, four sets of sprockets, and a drive motor, so that the conveying chain group 12 can rotate inside the fixed frame 6.

[0024] Furthermore, a pusher block 13 is fixedly installed on the surface of the conveyor chain assembly 12, and the pusher block 13 is located between the outer shell 431 and the lower limit plate 433. Therefore, the second material 10, which has been rolled and formed, can be synchronously pushed into the interior of the guide assembly 8 through the axial movement of the pusher block 13.

[0025] Furthermore, the outer casing 431 is fixedly installed on the top of the mounting platform 41, and a lifting frame 42 is also provided on one side of the mounting platform 41. The lifting frame 42 is a lifting platform with a scissor brace structure and is driven by a hydraulic cylinder, which enables it to move the neatly stacked first material 46 vertically to one side of the outer casing 431.

[0026] It should be noted that the first material 46 can be rolled into the second material 10 by the forming component 43. The first material 46 refers to the paint can body in the shape of a metal sheet, and the second material 10 refers to the paint can body rolled into the shape of a metal cylinder. In the following content, the first material 46 and the second material 10 refer to the same thing.

[0027] See attached document Figure 7 , Figure 8 and Figure 10A suction assembly 44 is fixedly installed on the top of the molding assembly 43, and the output end of the mounting base 441 is hinged to the connecting base 443 through a ball joint. Therefore, the retraction of the mounting base 441 can drive the connecting base 443 and the card holder 444 to move downward in a fan shape, so that the card holder 444 drives the pneumatic suction cup 445 to move to the top of the first material 46.

[0028] According to the above structure, by activating the pneumatic suction cup 445, the air between the pneumatic suction cup 445 and the first material 46 can be sucked away, thereby achieving the adsorption between the pneumatic suction cup 445 and the first material 46.

[0029] Specifically, when the second cylinder 442 starts to extend, it can drive the connecting seat 443 and the pneumatic suction cup 445 to move upward in a fan shape, thereby causing the end of the first material 46 near the molding component 43 to be lifted up and moved above the guide plate 49. By stopping the operation of the pneumatic suction cup 445, the end of the first material 46 can be placed on the top of the guide plate 49.

[0030] More specifically, a feeding assembly 45 is also provided on the top of the first material 46. While limiting the first material 46 on the top of the lifting frame 42, the feeding assembly 45 can also send the first material 46 located on the top of the guide plate 49 into the interior of the forming assembly 43 for curling and forming.

[0031] Please refer to the appendix for details. Figure 2 , Figure 7 , Figure 11 and Figure 13 Mounting block 47 is fixedly installed on the side of frame 1 by bolts, and frame 451 is fixedly installed at the bottom of mounting block 47 by aluminum alloy connector. Frame 451 is assembled from multiple aluminum alloy profiles, and fixing rod 452 is fixedly installed at the top of frame 451.

[0032] Specifically, a third cylinder 455 is hinged to the outside of the fixing rod 452. The frame 451 can be adjusted by the third cylinder 455 by loosening the mounting block 47, thus making it suitable for different usage scenarios.

[0033] According to the above structure, a bracket is fixedly installed at the bottom of the frame 451, and the feeding wheel 453 is rotatably installed with the bracket. The rotation of the feeding wheel 453 is driven by a micro motor, and its surface is provided with anti-slip texture to increase the friction generated when it comes into contact with the first material 46, thereby ensuring sufficient pushing force so that the first material 46 can smoothly enter the interior of the molding component 43.

[0034] Furthermore, a conveying roller 48 is also provided inside the molding component 43. The conveying roller 48 can be externally driven by a motor to rotate, thereby gradually introducing the first material 46 into the molding area of ​​the molding roller 436. By starting the second motor 432, the gear set 435 and the molding roller 436 are driven to rotate, so that the first material 46 can be continuously extruded when passing through the molding roller 436, and gradually form a cylindrical second material 10.

[0035] Furthermore, at the bottom of the outer shell 431, side limiting plates 437 are provided on both sides of the forming roller 436. The side limiting plates 437 can restrict the movement direction of the second material 10 that is rolled and formed, so that the second material 10 is sleeved on the outside of the limiting cylinder 434.

[0036] It is worth noting that there is a certain gap between the limiting cylinder 434 and the forming roller 436, and this gap is greater than the thickness of the second material 10, so that the packaged and rolled second material 10 can move axially from the surface of the limiting cylinder 434 to the interior of the guiding assembly 8.

[0037] See attached document Figure 2 , Figure 5 and Figures 12 to 14 During the process of the second material 10 entering the guiding assembly 8, the guide frame 85 can play a guiding role. The first guide groove 851 and the second guide groove 852 are provided on both sides of the guide frame 85. Since the two ends of the second material 10 after being rolled and formed are not in complete contact, under the action of the guide frame 85, the two ends of the second material 10 can enter the interior of the first guide groove 851 and the second guide groove 852 respectively.

[0038] Specifically, a first guide groove 811 and a second guide groove 812 are respectively provided on both sides of the guide plate 81. The first guide groove 811 is connected to the first guide groove 851, and the second guide groove 812 is connected to the second guide groove 852. Therefore, the two ends of the second material 10 separated by the guide frame 85 can enter the interior of the guide plate 81.

[0039] Specifically, after the two ends of the second material 10 enter the interior of the first guide groove 811 and the second guide groove 812, the upper limit roller frame 5 and the lower limit roller frame 7 set inside the fixed frame 6 can clamp the exterior of the second material 10, so that the two ends of the second material 10 are misaligned and overlapped.

[0040] To achieve the above objectives, both the first guide trough 811 and the second guide trough 812 need to be designed to be inclined, and the first guide trough 811 and the second guide trough 812 are staggered in the vertical direction. Furthermore, the ends of the first guide trough 811 and the second guide trough 812 that extend into the guide plate 81 have a certain overlap in the vertical direction. Therefore, when the second material 10 moves to the other end inside the guide assembly 8, the overlap of the first guide trough 811 and the second guide trough 812 is the overlap length between the two ends of the second material 10.

[0041] It is worth noting that the first guide groove 811 and the second guide groove 812 provided on both sides inside the guide plate 81 do not overlap at the starting end. They gradually overlap to a set overlap length at the end near the conveyor roller group 14. Therefore, when the copper wire 37 of the welding part 3 passes through the guide assembly 8 and enters the fixed seat 9, the two ends of the second material 10 will not come into contact with the copper wire 37 during the movement inside the first guide groove 811 and the second guide groove 812.

[0042] As can be further explained, the guide plate 81 is fixed between the fixed seat 9 and the upper limit roller frame 5 with bolts. At the same time, the guide plate 81 adopts a modular design, so in actual use, the corresponding guide plate 81 can be replaced according to the different dimensions of the paint can body being welded.

[0043] Please refer to the appendix again. Figure 5 , Figure 12 and Figure 13 An installation groove is provided at the other end of the guide plate 81, and the first clamping part 82 and the second clamping part 83 are slidably installed inside the installation groove via the guide rod 84. The first clamping part 82 and the second clamping part 83 are arranged in a mirror image, so that the second material 10 can pass through the first clamping part 82 and the second clamping part 83 under the guidance of the guide plate 81.

[0044] Specifically, the first clamping part 82 and the second clamping part 83 have the same structure, and the first clamping part 82 and the second clamping part 83 can work together, that is, simultaneously energize the electromagnets 822 mounted on the mounting plate 821 of the first clamping part 82 and the second clamping part 83, so that the electromagnets 822 generate magnetism.

[0045] Furthermore, the N pole of the electromagnet 822 located inside the first clamping part 82 faces downward, while the N pole of the electromagnet 822 located inside the second clamping part 83 faces upward. Therefore, when the second material 10 has not passed through the first clamping part 82 and the second clamping part 83, the pressing rollers 823 located inside the first clamping part 82 and the second clamping part 83 are moved away from each other by the repulsion of the like poles of the two sets of electromagnets 822.

[0046] Furthermore, when the second material 10 passes between the first clamping part 82 and the second clamping part 83, the magnetic repulsion between the first clamping part 82 and the second clamping part 83 can be isolated by the second material 10. Under the magnetic attraction between the electromagnet 822 and the outside and inside of the second material 10, the pressing roller 823 moves synchronously toward the second material 10 and applies a certain clamping force from the inside and outside of the second material 10.

[0047] It is worth noting that this clamping method can not only avoid damage to the thin-walled tank body, but also ensure that the second material 10 maintains a stable position during the welding process, further improving the welding accuracy and product quality. At the same time, the clamping effect can also close both ends of the second material 10 before welding.

[0048] In addition, the design of the first clamping part 82 and the second clamping part 83 also has an adaptive function. The electromagnet 822 inside can automatically adjust the magnetic strength according to the thickness of the second material 10, thereby realizing the compatibility processing of metal paint can bodies of different specifications. This feature makes the device more flexible and efficient in dealing with diverse production needs.

[0049] As can be further explained, the first guide groove 811 and the second guide groove 812 used at one end of the guide plate 81 on which the first clamping part 82 and the second clamping part 83 are installed are directly connected, thereby ensuring that the first clamping part 82 and the second clamping part 83 can push the two ends of the second material 10 to close.

[0050] See attached document Figures 4 to 6 and Figure 13 Multiple guide wheels 36, a tensioning wheel assembly 35, and an upper guide wheel 32 are rotatably mounted on the surface of the frame 1. A first motor 31 is driven to one side of the upper guide wheel 32, and copper wire 37 is wound on the surfaces of the guide wheels 36, the tensioning wheel assembly 35, and the upper guide wheel 32.

[0051] Furthermore, the welding part 3 also includes a copper wire 37, a guide wheel 36 and a lower guide wheel 34 located inside the fixed base 9. One end of the conductive wheel 38 is provided with a conductive slip ring. The inner wall of the fixed base 9 is provided with a carbon brush assembly that slides in contact with the conductive slip ring. The carbon brush assembly is connected to an external power source through a wire to supply power to the rotating copper wire 37.

[0052] Furthermore, a first cylinder 33 is fixedly installed inside the fixed base 9, and the output shaft of the first cylinder 33 is fixedly installed with the bearing seat of the lower guide wheel 34. Therefore, the lower guide wheel 34 can be pushed to slide inside the fixed base 9 by starting the first cylinder 33, thereby adjusting the distance between the upper guide wheel 32 and the lower guide wheel 34.

[0053] Specifically, the copper wire 37 has two arc-shaped sections on the surfaces of the upper guide wheel 32 and the lower guide wheel 34 that come into contact with the second material 10. Therefore, as the lower guide wheel 34 moves upward, the lower arc-shaped section can approach the upper arc-shaped section, thereby applying a set welding pressure to the second material 10 and improving the welding quality.

[0054] It should be noted that, due to the welding pressure between the copper wire 37 and the second material 10, the copper wire 37 can push the second material 10 to move axially during the continuous rotation of the copper wire 37, thereby achieving continuous welding of the second material 10 on both sides. At the same time, inside the fixed frame 6, a conveyor roller group 14 is provided on one side of the upper guide wheel 32 and the lower guide wheel 34. Therefore, the copper wire 37 can send the welded second material 10 to the conveyor roller group 14, and the conveyor roller group 14 can send the welded second material 10 to the next process for processing.

[0055] As a supplementary explanation, a protective cover 2 is also installed on the front of the frame 1. The protective cover 2 can be flipped on the front of the frame 1 to cover the welding part 3, thereby preventing safety hazards caused by foreign objects or human beings coming into contact with the copper wire 37 during the welding process.

[0056] It is worth noting that the copper wire 37 is a closed loop, so the copper wire 37 located inside the rack 1 can be cooled by the air-cooling structure 11 installed inside the rack 1, thereby avoiding the copper wire 37 from being affected by high temperature for a long time. The air-cooling structure 11 consists of an outer shell and an internal array of fans.

[0057] In addition, to ensure the continuity and efficiency of the welding process, the drive system of the first motor 31 can adopt a high-precision servo motor. This type of motor has the characteristics of fast response and stable operation, and can flexibly adjust the speed of the copper wire 37 according to actual needs, so as to adapt to the welding requirements of metal paint can bodies of different specifications.

[0058] like Figure 1-16 As shown, this embodiment also provides a method for double-sided welding of the joint seam of a metal paint can, which achieves efficient and high-quality production of the can body through the following specific structure and process steps.

[0059] Feeding and conveying process: The feeding and forming unit 4 involved in this process is installed at the beginning of the production line. The feeding and forming unit 4 includes a vertically lifting frame 42 and a feeding component 45 located above it. The first material 46, which has been cut in the previous step, is neatly stacked on the top of the lifting frame 42. When the feeding program is started, the suction component 44 moves downward and sucks up the top single sheet of thin plate. With the rotation of the feeding wheel 453, the sheet is separated from the material pile and conveyed forward to the entrance of the forming component 43 of the next process.

[0060] Rolling and forming process: Several sets of conveying rollers 48 and a set of adjustable gap forming rollers 436 are installed in parallel inside the outer casing 431. When the rectangular first material 46 is conveyed to the conveying roller 48, it continues to move forward under the action of friction on the roller surface and enters the arc-shaped cavity of the forming roller 436. As the forming rollers 436 rotate in opposite directions, the flat material is subjected to gradually increasing bending stress, thereby undergoing plastic deformation along the longitudinal direction and continuously curling into a cylindrical second material 10 with an open longitudinal slit, which is then fitted onto the outside of the limiting cylinder 434.

[0061] Positioning and feeding process: After being rolled and formed, the cylindrical second material 10 falls inside the lower limit plate 433. The starting drive push block 13 of the conveyor chain group 12 abuts against the rear edge of the cylindrical second material 10 and pushes it axially, so that the second material 10 passes through the limit cylinder 434 and moves to the guide assembly 8. The two ends of the second material 10 pass through the first guide groove 851 and the second guide groove 852 in sequence and enter the interior of the first guide groove 811 and the second guide groove 812. Through the special design of the second guide groove 812, the second material 10 moves towards the welding part 3. During this process, the upper limit roller frame 5 and the lower limit roller frame 7 automatically adjust the overlap length of the two ends of the second material 10 and move to the other end of the guide plate 81.

[0062] Overlapping and closing procedures: The end of the material guiding assembly 8 is equipped with a first clamping part 82 and a second clamping part 83. When the front end of the cylindrical second material 10 enters the channel formed by the first clamping part 82 and the second clamping part 83, the electromagnet 822 is in the normally open state. Therefore, the transmission of the magnetic field is blocked by the second material 10, causing the two sets of electromagnets 822 to move towards the outer wall and inner wall of the second material 10 respectively, and drive the two sets of pressing rollers 823 to press the longitudinal seam of the second material 10 together precisely and tightly to form an overlapping state, which is ready for subsequent welding.

[0063] Longitudinal seam welding process: This process uses resistance welding technology. The upper guide wheel 32 can be driven by the first motor 31 installed inside the frame 1. A copper wire 37 is wrapped around the upper guide wheel 32, the lower guide wheel 34, the guide wheel 36 and the conductive wheel 38 under the tensioning action of the tensioning wheel group 35, forming a loop.

[0064] When welding begins, the first cylinder 33 pushes the lower guide wheel 34 upward, causing the copper wire 37 on the lower guide wheel 34 to press against the overlap of the cylindrical second material 10. At this time, the upper arc-shaped part of the copper wire 37 is pressed against the outer wall of the cylindrical second material 10, and the lower arc-shaped part is pressed against the inner wall of the cylindrical second material 10.

[0065] Subsequently, the conductive wheel 38, which is in contact with the copper wire 37, is connected to an external welding power source (high current, low voltage). Due to the maximum contact resistance at the lap joint, the instantaneous high temperature melts the metal, achieving welding. At the same time, the start of the first motor 31 drives the copper wire 37 to rotate continuously in a circular motion. The copper wire 37 rolls forward on the surface of the blank, thereby achieving continuous welding of the entire longitudinal seam. Because the copper wire 37 is constantly circulating, the welding point always contacts a new copper wire surface, avoiding electrode adhesion and ensuring the continuity and consistency of the weld.

[0066] Material cutting process: The second material 10, after welding, is started by the conveyor roller group 14 set at one end of the fixed frame 6, which can send the can body to subsequent processes, such as weld cooling, anti-rust paint application, flanging, bottom sealing or stacking, thereby completing the entire manufacturing process of the can body.

[0067] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A double-sided welding device for the joint seam of a metal paint can, characterized in that, include: The feeding and forming unit (4) and the conveying chain group (12) set at the bottom of the feeding and forming unit (4) for driving the push block (13) to move. The feeding and forming unit (4) is used to roll the first material (46) into the second material (10) and push the second material (10) to move horizontally inside the guide assembly (8) through the push block (13). The guide assembly (8) is used to drive the two ends of the second material (10) to overlap in a staggered manner and move to the upper guide wheel (32) and the lower guide wheel (34) of the welding part (3). A closed loop copper wire (37) is sleeved between an upper guide wheel (32) and a lower guide wheel (34). A plurality of guide wheels (36) for guiding are also provided between the upper guide wheel (32) and the lower guide wheel (34), as well as a tensioning wheel group (35) for adjusting the tension of the copper wire (37), so that the copper wire (37) forms a closed loop with two arc-shaped sections inside the upper guide wheel (32) and the lower guide wheel (34); The second material (10) to be welded is placed between the closed loops of the upper and lower arc sections. The copper wire (37) rotates under the drive of the upper guide wheel (32). The upper and lower arc sections of the copper wire (37) are pressed against the inner and outer walls of the second material (10). The contact resistance between the copper wire (37) and the second material (10) generates resistance heat to melt the second material (10). The first cylinder (33) pushes the lower guide wheel (34) to apply welding pressure for the double-sided continuous resistance seam welding of the longitudinal seam of the second material (10).

2. The double-sided welding device for the joint of a metal paint can according to claim 1, characterized in that: The feeding and forming unit (4) includes a mounting platform (41) set on the top of the frame (1), and a lifting frame (42) set on one side of the mounting platform (41) is used to push the first material (46) to move vertically, so that one end of the first material (46) moves to one side of the guide plate (49); A molding component (43) is fixedly installed on the top of the mounting platform (41). A suction component (44) fixedly installed on the top of the molding component (43) is used to drive one end of the first material (46) to tilt up, so that the tilted end of the first material (46) moves to the top of the guide plate (49).

3. The double-sided welding device for the joint of a metal paint can according to claim 2, characterized in that: The molding assembly (43) includes a housing (431) fixedly mounted on the top of the mounting platform (41), and a second motor (432) mounted on one side of the housing (431) for driving the gear set (435) to rotate. The gear set (435) is used to drive the two sets of forming rollers (436) to rotate, and the forming rollers (436) are provided in three sets and arranged in an inverted triangular shape, for curling the first material (46) into the second material (10). The two ends of the bottom forming roller (436) are threaded to the outer shell (431) through bearing seats and adjusting screws.

4. The double-sided welding device for the joint of a metal paint can according to claim 3, characterized in that: The molding component (43) also includes a limiting cylinder (434) disposed below the outer shell (431). A lower limiting plate (433) is concentrically arranged below the limiting cylinder (434). Side limiting plates (437) for limiting the movement trajectory of the first material (46) are fixedly installed on both sides of the outer shell (431), so that the first material (46) after being rolled is sleeved on the surface of the limiting cylinder (434). The lower limit plate (433) is located inside the fixed frame (6), and the conveyor chain group (12) installed inside the fixed frame (6) drives the push block (13) to move linearly, so that the push block (13) passes through the outer shell (431) and the lower limit plate (433), and pushes the second material (10) to move linearly.

5. The double-sided welding device for the joint of a metal paint can according to claim 4, characterized in that: The limiting cylinder (434) is provided with an upper limiting roller frame (5) and a lower limiting roller frame (7) on one side. The upper limiting roller frame (5) and the lower limiting roller frame (7) form a cage-type guide structure, which allows the push block (13) to push the second material (10) to move in the cage-type guide structure to the bottom of the welding part (3) for welding. The welding completed second material (10) is transported to the next process by the conveying roller group (14) provided on one side of the upper limiting roller frame (5). The upper limit roller frame (5) is used to drive the material guide assembly (8) to be fixedly installed with the frame (1). The bottom of the material guide assembly (8) is fixedly installed with a fixing seat (9) for guiding the copper wire (37) welded inside the second material (10).

6. The double-sided welding device for the joint of a metal paint can according to claim 1, characterized in that: The lower guide wheel (34) is located inside the fixed base (9), and the first cylinder (33) fixedly installed inside the fixed base (9) is used to push the lower guide wheel (34) to move vertically; The fixed base (9) is rotatably mounted with a conductive wheel (38) that conducts electricity with copper wire (37). One end of the conductive wheel (38) is provided with a conductive slip ring. The inner wall of the fixed base (9) is provided with a carbon brush assembly that slides in contact with the conductive slip ring. The carbon brush assembly is connected to an external power source through a wire to supply power to the rotating copper wire (37).

7. The double-sided welding device for the joint of a metal paint can according to claim 6, characterized in that: A guide plate (81) is fixedly installed on the top of the fixed base (9). A first clamping part (82) and a second clamping part (83) are provided on one side of the guide plate (81). An electromagnet (822) with the N pole facing down is provided inside the first clamping part (82), and an electromagnet (822) with the N pole facing up is provided inside the second clamping part (83). When the second material (10) passes through the first clamping part (82) and the second clamping part (83), the electromagnet (822) magnetically attracts the inner and outer walls of the second material (10), causing the pressing rollers (823) of the first clamping part (82) and the second clamping part (83) to move towards each other and are used to press and close the outer and inner walls of the second material (10). A guide frame (85) for guiding the second material (10) is fixedly installed on one side of the guide plate (81). A first guide groove (851) and a second guide groove (852) are respectively provided on both sides of the guide frame (85). The first guide groove (851) is connected to the first guide groove (811), and the second guide groove (852) is connected to the second guide groove (812), so that the two ends of the second material (10) move inside the first guide groove (811) and the second guide groove (812) respectively.

8. The double-sided welding device for the joint of a metal paint can according to claim 2, characterized in that: The suction assembly (44) includes a mounting base (441), on one side of which a second cylinder (442) is hinged. The second cylinder (442) is used to drive the connecting base (443) and the card holder (444) to move in a fan shape. The connecting base (443) is hinged to the top of the outer shell (431) through a hinged seat on the side. The card holder (444) is used to drive the pneumatic suction cup (445) to move to the top of the first material (46), and the pneumatic suction cup (445) sucks the upper surface of the first material (46), and moves one end of the first material (46) to the inside of the outer shell (431). The forming component (43) drives the conveying roller (48) to rotate, so that the first material (46) moves to the inside of the forming roller (436), and is rolled into a cylindrical shape by the rotation of the forming roller (436).

9. The double-sided welding device for the joint of a metal paint can according to claim 1, characterized in that: The first material (46) is provided with a feeding assembly (45) on top, and the feeding assembly (45) is installed on the frame (1) via a mounting block (47); The feeding assembly (45) includes a third cylinder (455) hinged to one side of the frame (1). The third cylinder (455) drives the frame (451) to move vertically through the fixed rod (452), so that the frame (451) drives (454) to roll into contact with the first material (46), and pushes the first material (46) to move linearly through the (454).

10. A method for double-sided welding of metal paint can joints, applied to the double-sided welding device for metal paint can joints according to any one of claims 1-9, characterized in that, Includes the following steps: Feeding and conveying: The first material (46) after being cut is placed on the top of the lifting frame (42). Through the coordinated action of the feeding wheel (453) and the suction component (44), the first material (46) is separated piece by piece and conveyed to the forming component (43). Rolling and forming: The first material (46) is introduced into the forming roller (436) by the rotation of the conveying roller (48). The first material (46) in the flat shape is continuously rolled into the second material (10) in the cylindrical shape by the rotation and extrusion action of the forming roller (436). Positioning and feeding: The push block (13) on the conveyor chain group (12) is driven to move by the operation of the conveyor chain group (12), and the cylindrical second material (10) blank is pushed along the axis so that it passes through the limiting cylinder (434) and enters the guide assembly (8) in sequence. The overlap length of the two ends of the second material (10) is precisely controlled by the guide assembly (8) to prepare for the joint. Overlap and closure: When the second material (10) passes through the channel formed by the first clamping part (82) and the second clamping part (83), the magnetic attraction force generated by the electromagnet (822) acts on the inner and outer walls of the blank, and with the cooperation of the clamping roller (823), the two ends of the second material (10) are tightly closed to form an overlap seam to be welded. Longitudinal seam welding: Start the first motor (31) to drive the upper guide wheel (32) and the lower guide wheel (34) to rotate synchronously, driving the copper wire (37) tensioned between them to circulate; at the same time, the first cylinder (33) drives the lower guide wheel (34) to move upward, applying a predetermined welding pressure, so that the upper and lower arc-shaped parts of the copper wire are tightly pressed against the inner and outer walls of the lap joint of the second material (10); and through the external power supply, power is supplied to the conductive wheel (38) in contact with the copper wire (37), so that the copper wire (37) heats up, and the lap joint of the second material (10) is melted and connected by resistance heat, so as to realize continuous resistance welding of the longitudinal seam of the tank body as the copper wire (37) rotates continuously; Material feeding: The second material (10) after welding is conveyed to the next process for processing under the action of the conveyor roller group (14) installed inside the fixed frame (6).

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