A seam welder for metal packaging cans

Abstract

A kind of joint welding machine for metal packaging can processing, the present application relates to metal intelligent welding equipment technical field, it includes frame, upper welding wheel component, lower electrode bar and pressing mechanism;The bottom of the crossbeam of frame is equipped with horizontal slide rail, and the pressing mechanism is movably installed on horizontal slide rail using horizontal sliding block, and the upper welding wheel component is installed on the pressing mechanism;The pressing mechanism is movably connected on horizontal nut in horizontal drive screw pair;Lower electrode bar is correspondingly arranged below upper welding wheel component;The lower side of lower electrode bar is provided with clamping mechanism;Lower electrode bar and clamping mechanism are rotatably installed on frame using rotating mechanism, and the upper portion of lower electrode bar is equipped with insulating baffle, it can be adjusted according to the diameter of metal can to be welded, improve adaptability;And have clamping positioning mechanism, can avoid the position deviation of metal packaging can body in the process of feeding welding, improve welding stability, improve welding quality.

Description

Technical Field

[0001] This invention relates to the field of intelligent metal welding equipment technology, specifically to a joint welding machine for processing metal packaging cans. Background Technology

[0002] Seam welding of metal packaging cans is a core manufacturing process. Currently, the mainstream equipment is the resistance seam welding machine, which achieves continuous welding by applying pressure and current through an electrode wheel and is widely used in the food and chemical industries. However, existing equipment has significant shortcomings in actual production: First, poor workpiece adaptability: traditional models are mostly fixed structures, making it difficult to accommodate cans of different diameters. Changing specifications is cumbersome and results in long downtime. Second, insufficient welding stability: small metal packaging cans are generally manually supported for welding, which can lead to positioning deviations and weld misalignment. Therefore, there is an urgent need to develop a metal packaging can seam welding machine with strong adaptability and stable welding to solve the above technical problems. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings and deficiencies of the prior art by providing a seam welding machine for metal packaging cans. This machine can be adjusted according to the diameter of the metal can to be welded, thus improving its adaptability. It also has a clamping and positioning mechanism to prevent the metal packaging can from shifting position during the feeding and welding process, thereby improving welding stability and welding quality.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: it includes a frame, an upper welding wheel assembly, a lower electrode rod, and a pressing mechanism; a horizontal slide rail is installed at the bottom of the frame's crossbeam, and a pressing mechanism is movably mounted on the horizontal slide rail using a horizontal slider; the upper welding wheel assembly is mounted on the pressing mechanism; the pressing mechanism is movably connected to a horizontal nut in a horizontal drive screw pair; the lower electrode rod is correspondingly positioned below the upper welding wheel assembly; a clamping mechanism is provided below the lower electrode rod; the lower electrode rod and the clamping mechanism are rotatably mounted on the frame using a rotating mechanism, and an insulating baffle is installed on the upper part of the lower electrode rod.

[0005] Furthermore, the upper welding wheel assembly includes an upper welding wheel drive, the output end of which is connected to the upper welding wheel, and the upper welding wheel drive is mounted on the bottom of the pressing mechanism using an upper welding wheel drive mounting base.

[0006] Furthermore, the pressing mechanism includes an upper welding wheel assembly mounting plate, the upper welding wheel drive mounting seat is fixed to the bottom of the upper welding wheel assembly mounting plate, the upper welding wheel assembly mounting plate is connected to the output end of the pressurizing cylinder, the pressurizing cylinder is fixed to the bottom of the horizontal nut, and longitudinal guide rods are fixed at the four corners of the upper welding wheel assembly mounting plate. The longitudinal guide rods are movably disposed in the longitudinal guide sleeves, the longitudinal guide sleeves are installed in the guide sleeve mounting plate, and the guide sleeve mounting plate is installed on the two side walls of the horizontal nut.

[0007] Furthermore, the rotating mechanism includes a rotating seat, one side wall of which is rotatably mounted in an opening in the longitudinal beam of the frame via a rotating shaft, and the other side wall of the rotating seat is connected to the output shaft of a rotary drive servo motor, which is embedded in the inner wall of the opening; positioning pins are movably inserted into the upper, lower, left, and right sides of the rotating seat, and the other end of the positioning pin is mounted on the output end of a positioning cylinder, which is embedded in the left and right inner walls of the opening; a wire hole is provided through the top of the rotating seat.

[0008] Furthermore, the clamping mechanism includes a clamping seat, the clamping seat having upper and lower guide grooves inside, a clamping bidirectional threaded screw being rotatably mounted in the upper and lower guide grooves via a screw seat, the lower end of the clamping bidirectional threaded screw passing through the clamping seat and connected to the output end of a clamping drive servo motor, the clamping drive servo motor being mounted at the bottom of the clamping seat via a motor mounting bracket; clamping nuts are rotatably connected to the clamping bidirectional threaded screw, the two clamping nuts being respectively connected to the upper clamping roller and the lower clamping roller, and the outer walls of the two clamping nuts are both limited and guided by the inner walls of the upper and lower guide grooves.

[0009] Furthermore, several limiting posts are installed at the bottom of the upper clamping roller, and the lower ends of the limiting posts are movably inserted into the lower clamping roller.

[0010] Furthermore, the clamping seat is mounted vertically and adjustablely in the rotating seat using a lifting mechanism.

[0011] Furthermore, the lifting mechanism includes a lifting drive servo motor, which is installed at the bottom of the groove inside the rotating seat. The output end of the lifting drive servo motor is connected to a lifting lead screw, and the upper end of the lifting lead screw is rotatably mounted on the top of the groove inside the rotating seat using a lead screw seat. The lifting lead screw is connected to the back of the clamping seat via a lifting nut. The two side walls of the clamping seat are slidably mounted on the lifting slide rails via lifting sliders, and the lifting slide rails are fixed to the two side walls of the groove inside the rotating seat.

[0012] Furthermore, the insulating baffle is movably inserted into a through groove on one side of the upper part of the lower electrode rod, and the outer end of the insulating baffle is exposed above the outer end of the lower electrode rod; several return springs are installed in the through groove, and the upper end of the return springs is connected to the bottom of the insulating baffle; several iron plates are embedded in one side wall of the insulating baffle, and the iron plates are magnetically attracted to the electromagnet, which is embedded in one inner side wall of the through groove.

[0013] The workflow of this invention is as follows: The upper welding wheel assembly, rotating mechanism, clamping mechanism, lower electrode rod, pressing mechanism, lifting mechanism, electromagnet, cooling system, dust removal system and power supply system (the cooling system, dust removal system and power supply system are all basic supporting systems of existing resistance welding machines, and will not be described in detail here) and other related electrical control components are all connected to the PLC programmable controller; According to the diameter specifications of the tank to be welded, the lifting mechanism is started, and the lifting drive servo motor drives the lifting screw to rotate. Through the lifting screw nut, the clamping mechanism is vertically adjusted along the lifting slide rail. In conjunction with the pressure stroke of the pressing mechanism, the clamping position of the lower electrode rod and the clamping position of the clamping mechanism are precisely radially matched with the welding position of the upper welding wheel assembly, which is compatible with the processing of tanks of different diameters. The electromagnet inside the lower electrode rod is de-energized and demagnetized. Under the return force of the return spring, the insulating baffle extends outward from the through groove. Multiple cans to be welded are then placed on the lower electrode rod with a certain gap, ensuring that the lower wall of each can is positioned between the upper and lower clamping rollers. The lower right edge of the overlapping weld seam of each can abuts against the side wall of the insulating baffle. This unifies the weld seams of multiple cans and aligns the weld seams with the welding station. Then, the clamping mechanism is activated. The clamping drive servo motor drives the clamping bidirectional threaded screw to rotate, causing the upper and lower clamping nuts to move synchronously in opposite directions along the upper and lower guide grooves. This, in turn, drives the upper and lower clamping rollers to close synchronously, stably clamping the tank to be welded. During the clamping process, the limiting post at the bottom of the upper clamping roller is inserted into the corresponding hole of the lower clamping roller to achieve precise limiting of the clamping stroke, avoid clamping misalignment, and prevent radial displacement and axial movement of the tank to be welded during subsequent welding feed, thus solving the defect of weld seam misalignment at the root. After clamping multiple tanks to be welded, the pressurizing cylinder of the pressing mechanism is activated, driving the upper welding wheel assembly mounting plate downwards. During this process, the longitudinal guide rod and the longitudinal guide sleeve form a vertical guide limit, ensuring the verticality and stability of the downward pressurization process and preventing pressurization deviation. After descending to the correct position, the upper welding wheel presses against the weld seam of the tank with a set pressure, forming a complete resistance welding circuit with the lower electrode rod below. The upper welding wheel drive rotates, coordinating with the horizontal feed of the horizontal drive screw pair to perform continuous seam welding operations on multiple tanks to be welded. Specifically, the welding current passes through the upper welding wheel. The heat is conducted to the joint of the tank body by the lower electrode rod. Joule heat is generated by the contact resistance of the metal contact surface, which rapidly heats the metal base material at the joint to a molten state. At the same time, under the constant pressure of the upper welding wheel, the molten metal is forged and bonded. With the continuous rotation and horizontal feed of the upper welding wheel, the entire joint of multiple tanks to be welded is continuously welded and formed. Throughout the welding process, the clamping mechanism always maintains a stable clamping on multiple tanks to be welded. With the internal support of the lower electrode rod, the positional deviation of multiple tanks to be welded is limited throughout the process, ensuring that the weld position is accurate, the formation is uniform, and the welding strength meets the standards. After welding is completed, the pressurizing cylinder drives the upper welding wheel assembly mounting plate and the upper welding wheel assembly to move upward and reset, detaching them from the welding station. The insulating baffle is manually pressed down. At this time, the electromagnet is energized and generates a magnetic attraction force, which overcomes the elastic force of the return spring by attracting the iron sheet, and retracts the insulating baffle 11 into the through groove. At the same time, the clamping drive servo motor rotates in the opposite direction, which drives the upper clamping roller and the lower clamping roller to move in opposite directions through the clamping bidirectional threaded screw, releasing the welded can. Then, the positioning cylinder drives the positioning pin to retract, releasing the circumferential lock on the rotating seat. The rotation drive servo motor starts, driving the rotating seat to rotate circumferentially around the rotation axis, which synchronously drives the lower electrode rod of the clamping mechanism and the welded can to rotate as a whole. Multiple welded cans slide directly from the lower electrode rod and the clamping mechanism, are quickly collected, and enter the next round of welding operation.

[0014] Compared with the prior art, the beneficial effects of the present invention are: High adaptability: The clamping position can be adjusted by the lifting mechanism and the pressurization stroke can be combined with the pressing mechanism to process tanks of different diameters. The changeover and debugging are simple and the downtime is greatly shortened. Precise positioning: The insulating baffle provides uniform positioning for the weld, and the clamping mechanism, in conjunction with the limiting column, stably clamps the tank, preventing radial offset and axial movement during welding and solving the problem of weld offset; High welding quality: The guiding structure of the pressing mechanism ensures the verticality of the pressure, and the clamping mechanism and the lower electrode rod provide double limiting during welding, making the weld position accurate, the forming uniform, and the welding strength up to standard. High production efficiency: It can realize continuous seam welding of multiple tanks. After welding, the clamps can be quickly released and rotated for unloading through an electronically controlled structure. No manual disassembly is required, which simplifies the process and improves the continuity of operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention.

[0016] Figure 2 This is a schematic diagram of the structure of the lower pressing mechanism and the upper welding wheel assembly in this invention.

[0017] Figure 3 This is a schematic diagram showing the connection between the rotating mechanism, the clamping mechanism, and the lower electrode rod in this invention.

[0018] Figure 4 yes Figure 3 Enlarged view of section A.

[0019] Figure 5 This is a schematic diagram showing the connection between the clamping mechanism and the lifting mechanism in this invention.

[0020] Figure 6 This is a schematic diagram of the clamping seat in the clamping mechanism of the present invention after being cut open.

[0021] Figure 7 This is a cross-sectional view of the lower electrode rod located at the position of the return spring in this invention.

[0022] Figure 8 yes Figure 7 Enlarged view of section B in the middle.

[0023] Figure 9 This is a cross-sectional view of the lower electrode rod located at the position of the electromagnet in this invention.

[0024] Figure 10 yes Figure 9 Enlarged view of section C.

[0025] Figure 11 This is a partially enlarged view of the clamping state of the upper and lower clamping rollers in this invention.

[0026] Explanation of reference numerals in the attached figures: Frame 1, Horizontal slider 2, Horizontal slide rail 3, Horizontal drive screw pair 4, Horizontal screw nut 4-1, Upper welding wheel assembly 5, Upper welding wheel drive 5-1, Upper welding wheel 5-2, Upper welding wheel drive mounting base 5-3, Rotating mechanism 6, Rotating seat 6-1, Wire guide hole 6-1-1, Rotating drive servo motor 6-2, Positioning cylinder 6-3, Positioning pin 6-4, Rotating shaft 6-5, Clamping mechanism 7, Clamping seat 7-1, Upper and lower guide grooves 7-1-1, Motor mounting base 7-2, Clamping drive servo motor 7-3, Lower clamping roller 7-4, Upper clamping roller 7-5 Roller, 7-6 Clamping nut, 7-7 Clamping bidirectional threaded screw, 8 Lower electrode rod, 8-1 Through groove, 9 Lowering mechanism, 9-1 Upper welding wheel assembly mounting plate, 9-2 Pressurizing cylinder, 9-3 Guide sleeve mounting plate, 9-4 Longitudinal guide sleeve, 9-5 Longitudinal guide rod, 10 Lifting mechanism, 10-1 Lifting drive servo motor, 10-2 Lifting screw, 10-3 Lifting slide rail, 10-4 Lifting slider, 10-5 Lifting nut, 11 Insulating baffle, 12 Return spring, 13 Iron sheet, 14 Electromagnet, 15 Limiting post, 16 Tank to be welded. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The preferred embodiments described are only examples. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] like Figures 1-11As shown, this specific embodiment adopts the following technical solution: It includes a frame 1, an upper welding wheel assembly 5, a lower electrode rod 8, and a pressing mechanism 9; a horizontal slide rail 3 is installed at the bottom of the crossbeam of the frame 1, and a pressing mechanism 9 is movably installed on the horizontal slide rail 3 by means of a horizontal slider 2. The upper welding wheel assembly 5 (the upper welding wheel assembly 5 is equipped with a wear compensation system, which is an existing structure and will not be described in detail here) is installed on the pressing mechanism 9; the pressing mechanism 9 is movably connected to the horizontal nut 4-1 in the horizontal drive screw pair 4; the lower electrode rod 8 is correspondingly set on... Below the upper welding wheel assembly 5; below the lower electrode rod 8, a clamping mechanism 7 is provided; the lower electrode rod 8 and the clamping mechanism 7 are rotatably mounted on the frame 1 by means of a rotating mechanism 6. An insulating baffle 11 is installed on the upper part of the lower electrode rod 8. The upper edge of the insulating baffle 11 has an arc-shaped structure that matches the outer circle of the lower electrode rod 8. Multiple sensors are installed on the upper outer wall of the lower electrode rod 8, located on the same side as the insulating baffle 11, to monitor whether the tank 16 to be welded is properly fitted and whether the weld joint is against the side wall of the insulating baffle 11.

[0029] The upper welding wheel assembly 5 includes an upper welding wheel drive 5-1, the output end of which is connected to the upper welding wheel 5-2. The upper welding wheel drive 5-1 is mounted on the bottom of the pressing mechanism 9 using an upper welding wheel drive mounting base 5-3.

[0030] The pressing mechanism 9 includes an upper welding wheel assembly mounting plate 9-1. The upper welding wheel drive mounting seat 5-3 is fixed to the bottom of the upper welding wheel assembly mounting plate 9-1. The upper welding wheel assembly mounting plate 9-1 is connected to the output end of the pressurizing cylinder 9-2. The pressurizing cylinder 9-2 is fixed to the bottom of the horizontal nut 4-1. Longitudinal guide rods 9-5 are fixed at the four corners of the upper welding wheel assembly mounting plate 9-1. The longitudinal guide rods 9-5 are movably arranged in the longitudinal guide sleeves 9-4. The longitudinal guide sleeves 9-4 are installed in the guide sleeve mounting plate 9-3. The guide sleeve mounting plate 9-3 is installed on both side walls of the horizontal nut 4-1.

[0031] The rotating mechanism 6 includes a rotating seat 6-1. One side wall of the rotating seat 6-1 is rotatably mounted in an opening in the longitudinal beam of the frame 1 via a rotating shaft 6-5. The other side wall of the rotating seat 6-1 is connected to the output shaft of a rotary drive servo motor 6-2, which is embedded in the inner wall of the opening. Positioning pins 6-4 are movably inserted into the upper, lower, left, and right sides of the rotating seat 6-1. The other end of the positioning pin 6-4 is mounted on the output end of a positioning cylinder 6-3, which is embedded in the inner walls of the opening. A stroke sensor is installed on the inner wall of the opening in the longitudinal beam of the frame 1, on one side of the positioning cylinder 6-3, to detect whether the positioning pin 6-4 is fully inserted into the positioning hole of the rotating seat 6-1, thus achieving effective locking. A wire hole 6-1-1 is provided through the top of the rotating seat 6-1 for connecting the through-layout of the wiring.

[0032] The clamping mechanism 7 includes a clamping seat 7-1. The clamping seat 7-1 has upper and lower guide grooves 7-1-1 inside. A clamping bidirectional threaded screw 7-7 is rotatably mounted in the upper and lower guide grooves 7-1-1 via a screw seat. The lower end of the clamping bidirectional threaded screw 7-7 passes through the clamping seat 7-1 and connects to the output end of a clamping drive servo motor 7-3. The clamping drive servo motor 7-3 is mounted on the bottom of the clamping seat 7-1 via a motor mounting base 7-2. Clamping nuts 7-6 are rotatably connected to the clamping bidirectional threaded screw 7-7. The two clamping nuts 7-6 are respectively connected to the upper clamping roller 7-5 and the lower clamping roller 7-6. 4 (and a pressure sensor is embedded at the connection position between the roller shaft end of the upper clamping roller 7-5 and the clamping nut 7-6 to monitor the clamping force of the upper clamping roller 7-5 and the lower clamping roller 7-4 on the tank 16 to be welded in real time, so as to ensure that the clamping force is uniform and there is no overpressure or underpressure), and the outer walls of the two clamping nuts 7-6 are limited and guided by the inner walls of the upper and lower guide grooves 7-1-1; several limiting posts 15 are installed at the bottom of the upper clamping roller 7-5, and the lower ends of the limiting posts 15 are movably inserted into the lower clamping roller 7-4; the clamping seat 7-1 is installed in the rotating seat 6-1 in an adjustable manner using the lifting mechanism 10.

[0033] The lifting mechanism 10 includes a lifting drive servo motor 10-1, which is installed at the bottom of the groove inside the rotating seat 6-1. The output end of the lifting drive servo motor 10-1 is connected to a lifting lead screw 10-2. The upper end of the lifting lead screw 10-2 is rotatably mounted on the top of the groove inside the rotating seat 6-1 using a lead screw seat. The lifting lead screw 10-2 is connected to the back of the clamping seat 7-1 using a lifting lead screw nut 10-5. The two side walls of the clamping seat 7-1 are slidably mounted on the lifting slide rail 10-3 using a lifting slider 10-4. The lifting slide rail 10-3 is fixed to the two side walls of the groove inside the rotating seat 6-1.

[0034] The insulating baffle 11 is movably inserted into the through groove 8-1 on one side of the upper part of the lower electrode rod 8, and the outer end of the insulating baffle 11 is exposed to the outer end of the lower electrode rod 8. The inside of the through groove 8-1 is coated with a high-temperature resistant coating and an insulating coating to effectively prevent the return spring 12 and the insulating baffle 11 placed in the through groove 8-1 from being deformed by heat. Several return springs 12 are installed in the through groove 8-1, and the upper end of the return spring 12 is connected to the bottom of the insulating baffle 11. Several iron pieces 13 are embedded in one side wall of the insulating baffle 11. The iron pieces 13 are magnetically attracted to the electromagnet 14. The electromagnet 14 is embedded in one inner side wall of the through groove 8-1. When the insulating baffle 11 is extended to the limit, the iron pieces 13 and the electromagnet 14 are in a vertically misaligned state.

[0035] Before use, the following components are connected to the PLC programmable controller: upper welding wheel assembly 5, rotating mechanism 6, clamping mechanism 7, lower electrode rod 8, pressing mechanism 9, lifting mechanism 10, electromagnet 14, cooling system, dust removal system, and power supply system (the cooling system, dust removal system, and power supply system are all basic supporting systems of existing resistance welding machines and will not be described in detail here). The PLC programmable controller is set with full-process action safety interlock logic and a linkage adjustment database of welding parameters and tank diameter. Each sensor adopts a protective structure that is resistant to high welding temperature and prevents metal spatter, so as to avoid circuit damage or signal interference under welding conditions and ensure that the detection signal is stably transmitted to the PLC programmable controller. According to the diameter specifications of the tank 16 to be welded, the lifting mechanism 10 is started, and the lifting drive servo motor 10-1 drives the lifting screw 10-2 to rotate. Through the lifting screw nut 10-5, the clamping mechanism 7 is driven to make vertical lifting and lowering adjustment along the lifting slide rail 10-3. With the pressure stroke of the pressing mechanism 9, the clamping position of the lower electrode rod 8 and the clamping position of the clamping mechanism 7 are precisely radially matched with the welding position of the upper welding wheel assembly 5, which is compatible with the processing of tanks of different diameters. The electromagnet 14 inside the lower electrode rod 8 is de-energized and demagnetized. Under the return force of the return spring 12, the insulating baffle 11 extends outward from the through groove 8-1. Then, multiple cans 16 to be welded are placed on the lower electrode rod 8 with a certain gap, and the lower can wall of the can 16 to be welded is located between the upper clamping roller 7-5 and the lower clamping roller 7-4. The lower right edge of the overlapping part of the weld seam of the can 16 to be welded abuts against the side wall of the insulating baffle 11, so that the weld seam of multiple cans 16 to be welded is unified and the weld seam of the can is aligned with the welding station. After the multiple cans 16 to be welded are detected to be in place, the next process begins. Then, the clamping mechanism 7 is activated, and the clamping drive servo motor 7-3 drives the clamping bidirectional threaded screw 7-7 to rotate, causing the upper and lower clamping nuts 7-6 to move synchronously towards each other along the upper and lower guide grooves 7-1-1. This drives the upper clamping roller 7-5 and the lower clamping roller 7-4 to close synchronously, stably clamping the tank 16 to be welded. The pressure sensor monitors the clamping force in real time to ensure uniformity. During the clamping process, the limiting post 15 at the bottom of the upper clamping roller 7-5 is inserted into the corresponding hole of the lower clamping roller 7-4 to achieve precise limiting of the clamping stroke, avoid clamping misalignment, and prevent radial displacement and axial movement of the tank 16 to be welded during subsequent welding feed, thus solving the defect of weld misalignment from the root. After clamping multiple tanks 16 to be welded, the pressurizing cylinder 9-2 of the pressing mechanism 9 is activated, driving the upper welding wheel assembly mounting plate 9-1 downward. During this process, the longitudinal guide rod 9-5 and the longitudinal guide sleeve 9-4 form a vertical guide limit to ensure the verticality and stability of the downward pressurization process and avoid pressurization deviation. After descending to the position, the upper welding wheel 5-2 is pressed against the weld seam of the tank with a set pressure, forming a complete resistance welding circuit with the lower electrode rod 8 below. The upper welding wheel drive 5-1 drives the upper welding wheel 5-2 to rotate, cooperating with the horizontal feed of the horizontal drive screw pair 4 to perform continuous seam welding operations on multiple tanks to be welded. The wear compensation system at the upper welding wheel assembly 5 automatically compensates for the wear of the welding wheel. Specifically: the welding current is conducted to the joint of the tank body through the upper welding wheel 5-2 and the lower electrode rod 8. Joule heat is generated by the contact resistance of the metal contact surface, which rapidly heats the metal base material at the joint to a molten state. At the same time, under the constant pressure of the upper welding wheel 5-2, the molten metal completes the forging and pressing bond. With the continuous rotation and horizontal feed of the upper welding wheel 5-2, the continuous welding and forming of the entire joint of multiple tank bodies 16 to be welded is achieved. Throughout the welding process, the clamping mechanism 7 always maintains a stable clamping on the multiple tank bodies 16 to be welded. With the internal support of the lower electrode rod 8, the positional deviation of the multiple tank bodies 16 to be welded is limited throughout the process, ensuring that the weld position is accurate, the forming is uniform, and the welding strength meets the standards. After welding is completed, the welded tank is allowed to cool. Then, the pressurizing cylinder 9-2 drives the upper welding wheel assembly mounting plate 9-1 and the upper welding wheel assembly 5 to move upward and reset, disengaging them from the welding station. The insulating baffle 11 is manually pressed down. At this time, the electromagnet 14 is energized to generate a magnetic attraction force, which overcomes the elastic force of the return spring 12 by adsorbing the iron sheet 13, and retracts the insulating baffle 11 into the through groove 8-1. Simultaneously, the clamping drive servo motor 7-3 rotates in the opposite direction, driving the upper clamping roller 7-5 and the lower clamping roller 7-4 to move in opposite directions through the clamping bidirectional threaded screw 7-7, releasing the welded tank. Next, the positioning cylinder 6-3 drives the positioning pin 6-4 to retract, releasing the circumferential lock on the rotating seat 6-1. The rotation drive servo motor 6-2 starts, driving the rotating seat 6-1 to rotate around the rotation axis 6-5. The circumferential rotation synchronously drives the clamping mechanism 7, the lower electrode rod 8, and the welded tank to rotate as a whole. Multiple welded tanks slide directly off the lower electrode rod 8 and the clamping mechanism 7, are quickly collected, and then enter the next round of welding operations.

[0036] Compared with the prior art, the beneficial effects of the present invention are: 1. Improve tank adaptability and reduce changeover costs: The lifting mechanism drives the clamping mechanism to make vertical lifting and adjustment, and with the pressure stroke of the pressing mechanism, the welding station and the clamping station can achieve precise radial adaptation, which can be compatible with the processing of metal packaging cans of different diameters; there is no need to change the fixed structure, and the debugging is simple when changing the tank specifications, which greatly shortens the equipment downtime and improves production efficiency.

[0037] 2. Achieve precise tank positioning and eliminate weld seam misalignment: Insulating baffles are used to uniformly limit the welding seam of the tank, ensuring that the weld seam of the tank is precisely aligned with the welding station; at the same time, the upper and lower clamping rollers of the clamping mechanism can stably clamp the tank, and with the precise limiting of the limiting column, radial deviation and axial movement of the tank during the welding feed are prevented, thus fundamentally solving the positioning deviation and weld seam misalignment problems caused by traditional manual support.

[0038] 3. Ensure welding pressure stability and improve welding foundation quality: The pressing mechanism is equipped with a longitudinal guide rod and a longitudinal guide sleeve. When the upper welding wheel assembly is driven by the pressurizing cylinder to pressurize downward, it forms a vertical guide limit to ensure the verticality and stability of the pressurization process, avoid pressurization deviation, and ensure that the upper welding wheel presses the tank weld seam evenly with the set pressure, laying the foundation for stable welding.

[0039] 4. Enables continuous seam welding and improves production efficiency: The rotation of the upper welding wheel, combined with the horizontal feed of the horizontal drive screw pair, can complete the continuous resistance seam welding of multiple tanks to be welded. The welding current forms a complete circuit through the upper welding wheel and the lower electrode rod. The metal is melted by Joule heating and then forged and pressed together, completing the welding of the entire seam in one go, which greatly improves the production efficiency of tank welding.

[0040] 5. Enables rapid unloading after welding and optimizes the work process: After welding, the insulating baffle can be retracted by electromagnet adsorption, the clamping mechanism releases the tank, and then the rotating mechanism drives the rotating seat to rotate the entire tank, so that the welded tank can slide down directly without manual disassembly, achieving rapid unloading and collection, simplifying the work steps, and further improving production continuity.

[0041] 6. The structural design is safe and practical, improving the usability of the equipment: The insulating baffle set on the lower electrode rod can position the tank before welding and can be easily retracted after welding without affecting unloading; the rotating mechanism realizes the circumferential locking and unlocking of the rotating seat through the positioning pin and positioning cylinder, ensuring the stability of the equipment structure during welding, and the operation is flexible when rotating for unloading. The overall structural design takes into account both safety and practicality.

[0042] For those skilled in the art, modifications can be made to the technical solutions described in the foregoing embodiments, and equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the protection scope of this invention.

Claims

1. A seam welding machine for processing metal packaging cans, characterized in that: It includes a frame (1), an upper welding wheel assembly (5), a lower electrode rod (8), and a pressing mechanism (9); a horizontal slide rail (3) is installed at the bottom of the crossbeam of the frame (1), and a pressing mechanism (9) is movably installed on the horizontal slide rail (3) by means of a horizontal slider (2), and the upper welding wheel assembly (5) is installed on the pressing mechanism (9); the pressing mechanism (9) is movably connected to the horizontal nut (4-1) in the horizontal drive screw pair (4); the lower electrode rod (8) is correspondingly arranged below the upper welding wheel assembly (5); a clamping mechanism (7) is arranged below the lower electrode rod (8); the lower electrode rod (8) and the clamping mechanism (7) are rotatably installed on the frame (1) by means of a rotating mechanism (6), and an insulating baffle (11) is installed on the upper part of the lower electrode rod (8).

2. The seam welding machine for processing metal packaging cans according to claim 1, characterized in that: The upper welding wheel assembly (5) includes an upper welding wheel drive (5-1), the output end of which is connected to the upper welding wheel (5-2), and the upper welding wheel drive (5-1) is mounted on the bottom of the pressing mechanism (9) using an upper welding wheel drive mounting base (5-3).

3. The seam welding machine for processing metal packaging cans according to claim 2, characterized in that: The pressing mechanism (9) includes an upper welding wheel assembly mounting plate (9-1), an upper welding wheel drive mounting seat (5-3) fixed at the bottom of the upper welding wheel assembly mounting plate (9-1), an upper welding wheel assembly mounting plate (9-1) connected to the output end of a pressurizing cylinder (9-2), a pressurizing cylinder (9-2) fixed at the bottom of a horizontal nut (4-1), and longitudinal guide rods (9-5) fixed at the four corners of the upper welding wheel assembly mounting plate (9-1). The longitudinal guide rods (9-5) are movably disposed in a longitudinal guide sleeve (9-4), a longitudinal guide sleeve (9-4) is installed in a guide sleeve mounting plate (9-3), and a guide sleeve mounting plate (9-3) is installed on both sides of the horizontal nut (4-1).

4. The seam welding machine for processing metal packaging cans according to claim 3, characterized in that: The rotating mechanism (6) includes a rotating seat (6-1). One side wall of the rotating seat (6-1) is rotatably mounted in an opening in the longitudinal beam of the frame (1) via a rotating shaft (6-5). The other side wall of the rotating seat (6-1) is connected to the output shaft of a rotating drive servo motor (6-2). The rotating drive servo motor (6-2) is embedded in the inner wall of the opening. Positioning pins (6-4) are movably inserted into the upper, lower, left, and right sides of the rotating seat (6-1). The other end of the positioning pin (6-4) is mounted on the output end of a positioning cylinder (6-3). The positioning cylinder (6-3) is embedded in the left and right inner walls of the opening. A wire hole (6-1-1) is opened through the top of the rotating seat (6-1).

5. A seam welding machine for processing metal packaging cans according to claim 4, characterized in that: The clamping mechanism (7) includes a clamping seat (7-1). The clamping seat (7-1) has an upper and lower guide groove (7-1-1) inside. A clamping bidirectional threaded screw (7-7) is rotatably mounted in the upper and lower guide groove (7-1-1) using a screw seat. The lower end of the clamping bidirectional threaded screw (7-7) passes through the clamping seat (7-1) and is connected to the output end of the clamping drive servo motor (7-3). The clamping drive servo motor (7-3) is mounted on the bottom of the clamping seat (7-1) using a motor mounting seat (7-2). A clamping nut (7-6) is rotatably connected to the clamping bidirectional threaded screw (7-7). The two clamping nuts (7-6) are respectively connected to the upper clamping roller (7-5) and the lower clamping roller (7-4), and the outer walls of the two clamping nuts (7-6) are limited and guided by the inner wall of the upper and lower guide groove (7-1-1).

6. The seam welding machine for processing metal packaging cans according to claim 5, characterized in that: Several limiting posts (15) are installed at the bottom of the upper clamping roller (7-5), and the lower end of the limiting posts (15) is movably inserted into the lower clamping roller (7-4).

7. A seam welding machine for processing metal packaging cans according to claim 6, characterized in that: The clamping seat (7-1) is installed in the rotating seat (6-1) in an adjustable manner using a lifting mechanism (10).

8. A seam welding machine for processing metal packaging cans according to claim 7, characterized in that: The lifting mechanism (10) includes a lifting drive servo motor (10-1), which is installed at the bottom of the groove in the rotating seat (6-1). The output end of the lifting drive servo motor (10-1) is connected to a lifting screw (10-2). The upper end of the lifting screw (10-2) is rotatably installed on the top of the groove in the rotating seat (6-1) using a screw seat. The lifting screw (10-2) is connected to the back of the clamping seat (7-1) using a lifting screw nut (10-5). The two side walls of the clamping seat (7-1) are slidably mounted on the lifting slide rail (10-3) using a lifting slider (10-4). The lifting slide rail (10-3) is fixed on the two side walls of the groove in the rotating seat (6-1).

9. A seam welding machine for processing metal packaging cans according to claim 8, characterized in that: The insulating baffle (11) is movably inserted into the through groove (8-1) on one side of the upper part of the lower electrode rod (8), and the outer end of the insulating baffle (11) is exposed to the outer end of the lower electrode rod (8); several return springs (12) are installed in the through groove (8-1), and the upper end of the return spring (12) is connected to the bottom of the insulating baffle (11); several iron pieces (13) are embedded in one side wall of the insulating baffle (11), and the iron pieces (13) are magnetically attracted to the electromagnet (14), and the electromagnet (14) is embedded in one inner side wall of the through groove (8-1).

10. A seam welding machine for processing metal packaging cans according to claim 9, characterized in that: Its workflow is as follows: The upper welding wheel assembly (5), rotating mechanism (6), clamping mechanism (7), lower electrode rod (8), pressing mechanism (9), lifting mechanism (10), electromagnet (14), cooling system, dust removal system and power supply system and other related electrical control components are all connected to the PLC programmable controller; According to the diameter specification of the tank (16) to be welded, the lifting mechanism (10) is started, the lifting drive servo motor (10-1) drives the lifting screw (10-2) to rotate, and the lifting screw nut (10-5) drives the clamping mechanism (7) to make vertical lifting adjustment along the lifting slide rail (10-3). With the pressure stroke of the pressing mechanism (9), the clamping position of the lower electrode rod (8) and the clamping position of the clamping mechanism (7) are precisely matched with the welding position of the upper welding wheel assembly (5), which is compatible with the processing of tanks of different diameters. The electromagnet (14) inside the lower electrode rod (8) is de-energized and demagnetized. Under the rebound force of the return spring (12), the insulating baffle (11) extends outward from the through groove (8-1). Then, multiple cans (16) to be welded are placed on the lower electrode rod (8) with a certain gap, and the lower can wall of the can (16) to be welded is located between the upper clamping roller (7-5) and the lower clamping roller (7-4). The lower right edge of the overlapping part of the weld seam of the can (16) to be welded abuts against the side wall of the insulating baffle (11). The welding seams of multiple tanks (16) to be welded can be unified, and the welding seams of the tanks to be welded can be aligned with the welding station. Then the clamping mechanism (7) is started, and the clamping drive servo motor (7-3) drives the clamping bidirectional threaded screw (7-7) to rotate, which drives the upper and lower clamping nuts (7-6) to move synchronously in opposite directions along the upper and lower guide grooves (7-1-1), thereby driving the upper clamping roller (7-5) and the lower clamping roller (7-4) to close synchronously, and stably clamping the tank (16) to be welded. During the clamping process, the limiting post (15) at the bottom of the upper clamping roller (7-5) is inserted into the corresponding hole of the lower clamping roller (7-4) to achieve precise limiting of the clamping stroke, avoid clamping misalignment, and at the same time prevent the tank (16) to be welded from radial displacement and axial movement during the subsequent welding feed process, thus solving the defect of weld seam displacement from the root. After clamping multiple tanks (16) to be welded, the pressurizing cylinder (9-2) of the pressing mechanism (9) is activated, driving the upper welding wheel assembly mounting plate (9-1) to descend. During the process, the longitudinal guide rod (9-5) and the longitudinal guide sleeve (9-4) form a vertical guide limit to ensure the verticality and stability of the downward pressurization process and avoid pressurization deviation. After descending to the position, the upper welding wheel (5-2) presses against the weld seam of the tank with the set pressure, forming a complete resistance welding circuit with the lower electrode rod (8) below. The upper welding wheel drive (5-1) drives the upper welding wheel (5-2) to rotate, and cooperates with the horizontal feed of the horizontal drive screw pair (4) to perform continuous seam welding of multiple tanks to be welded. Specifically: welding current Through the upper welding wheel (5-2) and the lower electrode rod (8), the heat is conducted to the joint of the tank body. Joule heat is generated by the contact resistance of the metal contact surface, which quickly heats the metal base material at the joint to a molten state. At the same time, under the constant pressure of the upper welding wheel (5-2), the molten metal completes the forging and pressing. With the continuous rotation and horizontal feeding of the upper welding wheel (5-2), the continuous welding and forming of the entire joint of multiple tanks (16) to be welded is achieved. During the entire welding process, the clamping mechanism (7) always maintains stable clamping on multiple tanks (16) to be welded. With the internal support of the lower electrode rod (8), the positional deviation of multiple tanks (16) to be welded is restricted throughout the process, ensuring that the weld position is accurate, the forming is uniform, and the welding strength meets the standards. After welding is completed, the pressurizing cylinder (9-2) drives the upper welding wheel assembly mounting plate (9-1) and the upper welding wheel assembly (5) to move upward and reset, leaving the welding station; the insulating baffle (11) is manually pressed down. At this time, the electromagnet (14) is energized to generate a magnetic attraction force, which overcomes the elastic force of the return spring (12) by adsorbing the iron sheet (13), and retracts the insulating baffle (11) into the through groove (8-1); at the same time, the clamping drive servo motor (7-3) rotates in the opposite direction, and drives the upper clamping roller (7-5) and the lower clamping roller (7-4) to move in opposite directions through the clamping bidirectional threaded screw (7-7), releasing the welded tank; then, the positioning cylinder (6-3) drives the positioning pin (6-4) to retract, releasing the circumferential lock on the rotating seat (6-1); the rotation drive servo motor (6-2) starts, driving the rotating seat (6-1) to rotate around the rotation axis (6-5). The circumferential rotation synchronously drives the lower electrode rod (8) and the welded tank body of the clamping mechanism (7) to rotate as a whole. Multiple welded tank bodies slide directly from the lower electrode rod (8) and the clamping mechanism (7), are quickly collected, and then enter the next round of welding operation.

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