A post-weld surface treatment assist device for a can bodymaker seam welder

Abstract

The application discloses a kind of postweld surface treatment auxiliary devices of can making seam welder, belong to welding auxiliary equipment technical field.It includes push can feeding mechanism, seam welding mechanism, discharge conveying mechanism, pressure coating mechanism and processing mechanism in its side;Pressure coating mechanism includes liquid supply unit, coating unit with profiling roller and scraping unit with C-shaped scraper;Processing mechanism includes trigger unit with slope end and friction end and supply unit.The application is rolled by profiling roller and is coated, which avoids the wear and tear of traditional brush and uneven coating;When cleaning, trigger unit translation uses slope end to lift profiling roller, friction end drives its rotation, and supply unit discharges diluent in parallel, guides profiling roller to soften by liquid and cooperates C-shaped scraper to remove residual paint automatically, which eliminates manual shutdown disassembly and washing process, and significantly improves the automation continuous operation efficiency of assembly line.

Description

Technical Field

[0001] This invention relates to the field of welding auxiliary equipment technology, and in particular to a post-weld surface treatment auxiliary device for a can-making seam welding machine. Background Technology

[0002] In existing automated metal can manufacturing lines, the standard can-making process typically includes sequential steps such as can body rolling, longitudinal seam welding, online weld seam repair coating, and subsequent curing and drying. Among these, the online weld seam repair coating mechanism, as a key post-processing device, performs a secondary coating treatment on the newly welded joint area. The operational stability and coating accuracy of this mechanism determine the corrosion resistance and sealing life of the finished metal can.

[0003] In the manufacturing process of metal cans, longitudinal seams are typically connected using resistance welding. During welding, the instantaneous high temperature can directly burn away the original metal protective coating and printed coating on the surface of the weld and its heat-affected zone. To prevent the exposed pure iron substrate from rapidly oxidizing and corroding in the air, an online surface treatment process must be performed immediately after the seam welding. This involves applying a protective coating, such as a quick-drying anti-corrosion paint, to the weld while it is still hot to form a protective layer and achieve a leak-proof seal.

[0004] Currently, most existing post-weld surface treatment equipment uses brush assemblies for contact coating. However, in actual high-speed continuous processing, the brushes are easily worn after prolonged relative friction with the can surface, resulting in uneven coating thickness and difficulty in uniform coating. Secondly, when the production line is intermittent or stopped, the highly volatile protective medium remaining in the micropores of the brush will evaporate and solidify, causing the bristles to lose their flexibility and become rigid and hardened. When used again, it is easy to scratch the surface of the subsequent metal can. To avoid this problem, operators need to disassemble the brushes for cleaning or scrap and replace consumables after stopping the machine. Manual intervention reduces the operating efficiency of the automated production line. Summary of the Invention

[0005] This invention provides an auxiliary device for post-weld surface treatment of a can-making seam welding machine, which solves the problems of uneven coating caused by wear during processing of existing contact brush coating devices, and the tendency to scratch the can body due to the drying and hardening of residual medium during machine downtime. It also requires disassembling the brush for cleaning or scrapping and replacing consumables after each machine downtime.

[0006] The present invention adopts the following technical solution: a post-weld surface treatment auxiliary device for a can-making seam welding machine. It includes a can-pushing and feeding mechanism for pushing and feeding metal cans; The seam welding mechanism, located downstream of the can-pushing and feeding mechanism, is used to complete the longitudinal seam welding of the metal can body. The discharge conveying mechanism is located downstream of the seam welding mechanism and is used to transport the welded metal tank. The pressure coating mechanism is located above the material conveying mechanism and includes a liquid supply unit, a coating unit, and a scraping unit located on one side of the coating unit. The liquid supply unit is used to drip paint onto the weld seam. The coating unit has a contour roller for pressing the weld seam. The scraping unit has a C-shaped scraper that abuts against the contour roller and is used to scrape the paint off the contour roller when it moves to a designated position. The processing mechanism, located on the side of the pressure coating mechanism, includes a trigger unit that moves towards the coating unit and a supply unit located on the side of the trigger unit. The trigger unit has an inclined end for lifting the contour roller and a friction end for frictionally driving the contour roller to rotate. The supply unit abuts against the trigger unit and is used to guide the contour roller to rotate and scrape off the paint when the trigger unit is displaced, as well as to discharge the diluent from the supply unit.

[0007] Furthermore, the pressure coating mechanism also includes a mounting top plate, which is fixed on the discharge conveying mechanism. The liquid supply unit includes a position sensor and a paint dripping tube. The position sensor is set on the side of the mounting top plate to sense the metal tank in place. The paint dripping tube is set vertically on the mounting top plate and aligned with the weld position, with one end adapted to be connected to an external liquid supply device for dripping paint onto the weld.

[0008] Furthermore, the coating unit includes a lifting cylinder, a lifting plate, a sleeve rod, and a U-shaped wheel frame. The lifting cylinder is vertically fixed to the side of the mounting top plate via a side frame to provide power for vertical displacement. The lifting plate is fixed to the telescopic end of the lifting cylinder. The sleeve rod consists of two interlocking rods with a spring connecting the interlocking ends of the two rods. One rod is vertically fixed to the lifting plate, and the U-shaped wheel frame is horizontally fixed to the bottom end of the other rod. A contour roller is rotatably mounted on the U-shaped wheel frame to press down on the weld seam.

[0009] Furthermore, the scraping unit also includes a rotating frame. One end of the rotating frame is rotatably mounted on the bottom surface of the mounting top plate via a torsion spring. The C-shaped scraper is inclinedly mounted on the rotating frame. The torsion spring is adapted to apply an initial torque to the rotating frame so that the C-shaped scraper always maintains an elastic contact with the contour roller when the contour roller approaches and reaches the designated position to scrape off the paint.

[0010] Furthermore, the triggering unit includes a mounting side plate, a horizontal cylinder, a C-shaped drive frame, a slider, and a sliding guide rail. The mounting side plate is fixed on the discharge conveying mechanism, the horizontal cylinder is horizontally mounted on the mounting side plate, the C-shaped drive frame is fixed on the telescopic end of the horizontal cylinder, the slider is fixed on the upper surface of the C-shaped drive frame, and the sliding guide rail is fixed on the bottom surface of the mounting top plate and slides with the slider to provide linear guidance for the displacement of the C-shaped drive frame.

[0011] Furthermore, the coating unit also includes a trigger rod and a friction rod. The trigger rod is horizontally fixed to the side of the U-shaped wheel frame, and the friction rod is coaxially fixed to the central axis of the contour roller. The inclined end includes a lifting block, and the friction end includes a friction strip. The lifting block is fixed to the upper surface of the lower horizontal end of the C-shaped drive frame and has a sloping front end. The friction strip is fixed to the bottom surface of the upper horizontal end of the C-shaped drive frame. When the lifting cylinder retracts to its initial state, and the horizontal cylinder drives the C-shaped drive frame to move, the front ramp of the lifting block is adapted to engage with the trigger rod to lift the contour roller, and the friction strip is adapted to contact the friction rod, using sliding friction to drive the contour roller to rotate.

[0012] Furthermore, the triggering unit also includes a squeezing wedge, which is fixed to the side of the C-shaped drive frame for contact and engagement with the supply unit; The supply unit includes a squeezing cylinder, a piston drive end, a limiting spring, and a liquid outlet pipe. The squeezing cylinder is fixed to the inner side of the mounting top plate by a clamp. One end of the piston drive end moves through the inside of the squeezing cylinder and is correspondingly set with the squeezing inclined block. The limiting spring is sleeved on the piston drive end and its two ends are respectively connected to the squeezing cylinder and the protrusion at one end of the piston drive end. It is used to initially limit the piston drive end to be in a stretched state relative to the squeezing cylinder. The liquid outlet pipe is connected to the bottom end of the squeezing cylinder through a one-way valve. The bottom of the squeezing cylinder is also connected to an inlet pipe through a one-way valve and is suitable for connection to an external liquid supply device.

[0013] Furthermore, the supply unit also includes a C-shaped cleaning frame and a liquid outlet horizontal pipe. The C-shaped cleaning frame is fixed on the bottom surface of the mounting top plate and is located directly above the contour roller. It is used to cover the contour roller during cleaning. The liquid outlet horizontal pipe is horizontally fixed inside the C-shaped cleaning frame and one end is connected to the liquid outlet pipe. Several drip nozzles are connected along the straight direction on the liquid outlet horizontal pipe for discharging diluent onto the surface of the contour roller.

[0014] Furthermore, it also includes a can-making frame, and the can-pushing and feeding mechanism includes a linear motion module, a sliding frame, a vertical push arm, and a pushing claw. The sliding frame is set on the linear motion module, the vertical push arm is fixed on the sliding frame, and the pushing claw is set at the bottom of the vertical push arm to abut against and push the edge of the metal can into the seam welding mechanism.

[0015] Furthermore, the seam welding mechanism includes a seam welding head, a conductive voltage wheel, an upper welding wheel, an auxiliary frame, and a guide wheel. The seam welding head is located on the side of the can-making machine frame. The conductive voltage wheel and the upper welding wheel are both located on the seam welding head. The guide wheel is located on the can-making machine frame via the auxiliary frame to adapt to the curvature of the metal can surface. A welding wheel bracket is also installed on the can-making machine frame via a support.

[0016] The technical solutions adopted in the embodiments of the present invention can achieve the following beneficial effects: An auxiliary device for post-weld surface treatment of a can-making seam welding machine is disclosed. This invention features a pressure coating mechanism positioned above the material conveying mechanism. A coating unit with a contouring roller applies paint dripping from the weld seam using a pressure coating method, replacing the traditional brush-based application. This effectively avoids problems such as brush media wear and uneven coating thickness. Simultaneously, the invention incorporates a side-mounted processing mechanism that works in conjunction with a scraping unit. When the machine stops or is intermittently moved to a designated position by the contouring roller, the trigger unit of the processing mechanism moves horizontally towards the coating unit, utilizing… The inclined end of the device lifts the contour roller, and the friction end drives the contour roller to rotate. During displacement, it contacts the linkage supply unit to discharge diluent to the contour roller, thereby guiding the contour roller to soften under the liquid while cooperating with the C-shaped scraper to perform a rotating scraping action. This achieves fully automatic in-situ cleaning and scraping of waste paint on the pressure coating parts, eliminating the hidden danger of residual medium volatilization and solidification leading to hardening and scratching of subsequent cans. It also eliminates the tedious process of manual shutdown for disassembly and cleaning or replacement of waste consumables, significantly improving the overall automated continuous operation efficiency of the can manufacturing line. Attached Figure Description

[0017] The accompanying drawings, which are provided to further illustrate the invention and form part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0018] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of an auxiliary device for post-weld surface treatment of a can-making seam welding machine according to this application; Figure 2 For the present invention Figure 1 Schematic diagram of the frame structure of the can-making machine; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the diagram; Figure 4 For the present invention Figure 2 Enlarged structural diagram at point B in the diagram; Figure 5 For the present invention Figure 1 A schematic diagram of a partial structure; Figure 6 For the present invention Figure 5 A schematic diagram of a partial structure; Figure 7 For the present invention Figure 6 Enlarged structural diagram at point C; Figure 8 For the present invention Figure 6 Another perspective structural diagram; Figure 9 For the present invention Figure 8 Enlarged structural diagram at point D in the diagram; Figure 10 For the present invention Figure 8 A partial structural diagram.

[0019] Figure label: 1. Can making machine frame; 11. Conveyor chain; 12. Supporting circular guide rail; 2. Seam welding mechanism; 21. Seam welding head; 22. Conductor roller; 23. Upper welding roller; 24. Auxiliary frame; 25. Guide roller; 26. Welding roller bracket; 3. Can pushing and feeding mechanism; 31. Linear movement module; 32. Sliding frame; 33. Vertical push arm; 34. Pushing claw; 35. Pushing end; 4. Discharge conveying mechanism; 41. Conveyor frame; 42. Clamping belt unit; 43. Drive motor; 5. Coating mechanism; 51. Mounting top plate; 52. In-situ sensor; 53. Paint dripping pipe; 54. 541. Lifting cylinder; 55. Side frame; 56. Lifting plate; 57. Sleeve rod; 58. U-shaped wheel frame; 59. Trigger rod; 60. Friction rod; 61. Contouring roller; 62. Rotating frame; 63. C-shaped scraper; 64. Processing mechanism; 65. Mounting side plate; 66. Horizontal cylinder; 67. C-shaped drive frame; 68. Sliding block; 69. Friction strip; 60. Sliding guide rail; 60. Lifting block; 610. Extrusion block; 62. Extrusion cylinder; 63. Piston drive end; 64. Limiting spring; 65. Liquid outlet pipe; 66. C-shaped cleaning frame; 67. Liquid outlet horizontal pipe. Detailed Implementation

[0020] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0021] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] Reference Figures 1-10 As shown, this embodiment provides a post-weld surface treatment auxiliary device for a can-making seam welding machine, including a can-pushing and feeding mechanism 3 for pushing and feeding a metal can; a seam welding mechanism 2, located downstream of the can-pushing and feeding mechanism 3, for completing longitudinal seam welding of the metal can; a discharge conveying mechanism 4, located downstream of the seam welding mechanism 2, for conveying the welded metal can; and a pressure coating mechanism 5, located above the discharge conveying mechanism 4, including a liquid supply unit, a coating unit, and a scraping unit located on one side of the coating unit. The liquid supply unit is used to drip paint onto the weld seam, the coating unit has a contour roller 58 for pressing the weld seam, and the scraping unit has a C-shaped scraper 510. The C-shaped scraper 510 abuts against the contour roller 58 and is suitable for scraping the paint off the contour roller 58 when it moves to a specified position. The processing mechanism 6 is located on the side of the pressure coating mechanism 5. It includes a trigger unit that moves towards the coating unit and a supply unit located on the side of the trigger unit. The trigger unit has an inclined end for lifting the contour roller 58 and a friction end for frictionally driving the contour roller 58 to rotate. The supply unit abuts against the trigger unit and is used to guide the contour roller 58 to rotate and scrape off the paint when the trigger unit is displaced, as well as to discharge the diluent from the supply unit.

[0023] The working principle of this device is as follows: the metal can is pushed forward by the can feeding mechanism 3 and enters the seam welding mechanism 2 to complete the longitudinal weld. After welding, the can then enters the discharge conveying mechanism 4 for stable conveying. When it moves to the bottom of the pressure coating mechanism 5, the liquid supply unit drips paint onto the weld. The coating unit presses down to make the contour roller 58 elastically fit against the surface of the weld. The friction force of the can moving forward drives it to rotate and press the paint onto the weld.

[0024] When the machine is stopped for cleaning after the pressure coating is completed, the coating unit is lifted and reset. At this time, the trigger unit of the processing mechanism 6 starts to move laterally, and lifts the contour roller 58 into the internal space in sequence. At this time, the C-shaped scraper 510 of the scraping unit automatically adheres to the surface of the contour roller 58 and drives it to rotate at high speed to scrape the paint on the surface. At the same time, through the linkage extrusion supply unit, the thinner is sprayed onto the surface of the rotating contour roller 58, realizing the automated cleaning and paint scraping of the pressure coating roller after welding.

[0025] To achieve the feeding and seam welding of the metal tank, refer to Figures 1-4 As shown, it also includes a can-making frame 1 and a can-pushing and feeding mechanism 3, which includes a linear motion module 31, a sliding frame 32, a vertical push arm 33, and a pushing claw 34. The sliding frame 32 is mounted on the linear motion module 31, the vertical push arm 33 is fixed on the sliding frame 32, and the pushing claw 34 is mounted at the bottom of the vertical push arm 33. Furthermore, the front end of the pushing claw 34 is hinged to a pushing end 35, and a one-way torsion spring connects the two. When feeding, the linear motion module 31 drives the sliding frame 32 to move. When the pushing end 35 moves forward, it is limited by the one-way torsion spring, maintains hard contact with the end of the metal can, and pushes the feeding forward. When retracting, the pushing end 35 is obstructed and can overcome the spring force of the torsion spring to deflect, thereby smoothly avoiding the subsequent metal can.

[0026] It should be noted that the can-making frame 1 described in this embodiment is actually the frame of the rolling machine for the preceding process. Since it is a conventional and known device in the field, in order to highlight the core inventive point of this invention, it is only briefly described and schematically drawn in this application and the accompanying drawings.

[0027] During feeding, the linear motion module 31 drives the sliding frame 32 to move, and the pusher claw 34 directly abuts against and pushes the edge of the metal can, pushing it into the seam welding mechanism 2. The seam welding mechanism 2 includes a seam welding head 21, a voltage-conducting roller 22, an upper welding roller 23, an auxiliary frame 24, and a guide roller 25. The seam welding head 21 is located on the side of the can-making machine frame 1. The voltage-conducting roller 22 and the upper welding roller 23 are both located on the seam welding head 21. The guide roller 25 is located on the can-making machine frame 1 via the auxiliary frame 24. A welding roller bracket 26 is also mounted on the can-making machine frame 1 via a support. During welding, the guide roller 25 conforms to the curvature of the metal can surface, and works with the voltage-conducting roller 22 and the upper welding roller 23 to complete the longitudinal seam welding.

[0028] To ensure a smooth transport of the welded metal can body in preparation for subsequent coating, refer to... Figure 1 and Figure 5 As shown, the discharge conveying mechanism 4 includes a conveyor frame 41, a clamping belt unit 42, and a drive motor 43. The clamping belt unit 42 is symmetrically mounted on the conveyor frame 41, and the drive motor 43 is mounted on the conveyor frame 41. A conveying chain 11 is arranged in a straight line along one side of the can-making machine frame 1. A support circular guide rail 12 supporting the metal can is fixed to one end of the can-making machine frame 1 by a bracket. During the conveying process, the drive motor 43 provides power, and the clamping belt unit 42 clamps the surface of the welded metal can from both sides. In conjunction with the support circular guide rail 12 supporting the metal can at the bottom and the conveying chain 11, the can is ensured to move forward smoothly without deviation.

[0029] To achieve paint dripping and pressing, refer to Figures 5-8 As shown, the pressure coating mechanism 5 also includes a mounting top plate 51, which is fixed on the discharge conveying mechanism 4. The liquid supply unit includes a position sensor 52 and a paint dripping tube 53. The position sensor 52 is located on the side of the mounting top plate 51 and is used to sense the linear position of the front end of the metal can being conveyed forward by the clamping belt unit 42 in real time. The paint dripping tube 53 is rigidly mounted vertically through the mounting top plate 51, and its bottom outlet is aligned vertically with the longitudinal weld seam trajectory line of the metal can below. The top end of the paint dripping tube 53 is suitable for connection to an external liquid supply device and is used to perform quantitative and timed paint dripping operations at the axially moving weld seam when the position electrical signal of the control system is received.

[0030] To achieve adaptive elastic buffer coating, continue to refer to... Figures 5-8As shown, the coating unit includes a lifting cylinder 54, a lifting plate 55, a sleeve rod 56, and a U-shaped wheel frame 57. The lifting cylinder 54 is vertically fixed to the side of the mounting top plate 51 via a side frame 541. The lifting plate 55 is fixed to the telescopic end of the lifting cylinder 54. The sleeve rod 56 consists of two interlocking rods with a spring connecting the interlocking ends of the two rods. One rod is vertically fixed to the lifting plate 55. The U-shaped wheel frame 57 is horizontally fixed to the bottom end of the other rod. The contour roller 58 is rotatably mounted on the U-shaped wheel frame 57 and is used to press down and tightly adhere to the longitudinal weld seam on the surface of the tank.

[0031] During the pressure coating and follow-up buffer stroke, when the in-situ sensor 52 senses that the metal can is in position, it triggers the extension end of the lifting cylinder 54 to extend vertically downwards. Through the lifting plate 55 and the sleeve rod 56, it drives the U-shaped wheel frame 57 and the contour roller 58 to move downwards as a whole until the outer peripheral surface of the contour roller 58 presses against the weld surface of the metal can. As the downward stroke continues, the spring inside the sleeve rod 56 is compressed and undergoes axial deformation, providing a constant buffer force for the contour roller 58 to press downwards. At the same time, relying on the surface sliding friction generated by the linear displacement of the metal can, the contour roller 58 is passively driven to rotate continuously around its own central axis, and finally the paint dripped from the paint tube 53 is evenly spread and squeezed along the longitudinal weld.

[0032] To maintain elastic contact for scraping paint when the contour roller 58 moves to a designated height, refer to... Figure 10 As shown, the scraping unit also includes a rotating frame 59. One end of the rotating frame 59 is rotatably mounted on the bottom surface of the mounting top plate 51 via a torsion spring, and the C-shaped scraper 510 is inclinedly mounted on the rotating frame 59. In the default state, the torsion spring is suitable for applying initial torque to the rotating frame 59. When the machine is stopped for cleaning after the coating is completed, the lifting cylinder 54 retracts to lift the coating unit upward and reset it. Then, the trigger unit of the processing mechanism 6 starts to move laterally, further lifting the contour roller 58 into its internal space. At this time, driven by the initial torque of the torsion spring, the C-shaped scraper 510 automatically adheres to the outer peripheral surface of the contour roller 58 and always maintains a tight elastic contact.

[0033] During the subsequent rotation of the contour roller 58 driven by the trigger unit, the C-shaped scraper 510 utilizes the elastic pressing blade to generate relative friction, scraping off the paint adhering to the roller surface. Furthermore, in this application, a collection box can be installed at the inclined bottom end of the C-shaped scraper 510 via a bracket. Simultaneously, the scraped paint, under the influence of gravity and inertia, flows along the inclined and concave C-shaped arc structure on the upper surface of the C-shaped scraper 510, ultimately collecting in the collection box for unified collection, effectively preventing secondary splashing or backflow of waste paint towards the roller.

[0034] To drive the contour roller 58 to rotate for scraping and cleaning, refer to Figures 8-10As shown, the triggering unit includes a mounting side plate 61, a horizontal cylinder 62, a C-shaped drive frame 63, a slider 631, and a sliding guide rail 64. The mounting side plate 61 is fixed on the discharge conveying mechanism 4. The horizontal cylinder 62 is horizontally mounted on the mounting side plate 61. The C-shaped drive frame 63 is fixed to the telescopic end of the horizontal cylinder 62. The slider 631 is fixed to the upper surface of the C-shaped drive frame 63. The sliding guide rail 64 is fixed to the bottom surface of the mounting top plate 51 and slides in cooperation with the slider 631, providing high-strength linear guidance for the suspension displacement of the C-shaped drive frame 63. The coating unit also includes a trigger rod 571 and a friction rod 572. The trigger rod 571 is horizontally cantilevered and fixed to the side of the U-shaped wheel frame 57. The friction rod 572 is coaxially fixed to the central axis of the contour roller 58.

[0035] For transmission engagement, the inclined end of the trigger unit includes a lifting block 65, and the friction end includes a friction strip 632. The lifting block 65 is fixed on the upper surface of the lower horizontal end of the C-shaped drive frame 63 and the front end is designed as a climbing slope. The friction strip 632 is fixed on the bottom surface of the upper horizontal end of the C-shaped drive frame 63.

[0036] During the cleaning drive and transmission conversion stroke, when the pressure coating operation is completed and the lifting cylinder 54 retracts to its initial position, the driven trigger rod 571 is at a level with the bottom of the ramp at the front end of the lifting block 65. Subsequently, the horizontal cylinder 62 is activated and provides translational force, driving the C-shaped drive frame 63 to move forward linearly along the sliding guide rail 64.

[0037] In the previous shift stroke, firstly, the lower half of the C-shaped drive frame 63 is used to drive the front ramp of the lifting block 65 to abut against and gradually push the trigger rod 571 in front. Using the wedge transmission principle of the inclined plane, the sleeve rod 56 is forced to overcome the internal spring resistance to generate axial compression, thereby converting the horizontal thrust into a vertical upward lifting force, which drives the U-shaped wheel frame 57 and the contour roller 58 to be lifted upward a second time and enter the internal space of the upper supply unit. Next, using the upper half of the C-shaped drive frame 63 for transmission, the friction strip 632 fixed on the bottom horizontal end of the frame contacts the surface of the friction rod 572. As the C-shaped drive frame 63 moves forward horizontally, a continuous tangential sliding friction force is generated between the friction strip 632 and the relatively fixed friction rod 572. This friction force forms a torque, which is passively converted into the rotation of the friction rod 572 and its coaxially fixed contour roller 58 around its own central axis. Through the translation stroke of a single cylinder, the two compound actions of lifting and rotation friction are realized sequentially and synchronously, simplifying the power source and improving the cleaning transmission efficiency.

[0038] To achieve coordinated quantitative extrusion and spray guidance of the cleaning diluent, refer to Figure 6 and Figures 8-10The triggering unit also includes a squeezing ramp 66 fixed to the side of the C-shaped drive frame 63, with its lower end face designed as a ramp to provide the squeezing stroke. The supply unit includes a squeezing cylinder 67, a piston drive end 68, a limiting spring 69, a liquid outlet pipe 610, a C-shaped cleaning frame 611, and a liquid outlet horizontal pipe 612. The squeezing cylinder 67 is fixed to the inner side of the mounting top plate 51 by a clamp. One end of the piston drive end 68 extends movably into the interior of the squeezing cylinder 67 and is positioned directly below the squeezing ramp 66. The limiting spring 69 is sleeved on the piston drive end 68, and its two ends are respectively connected to the upper end face of the squeezing cylinder 67 and the boss at one end of the piston drive end 68, used to initially limit the piston drive end 68 to be in a pulled-out stretched state relative to the squeezing cylinder 67.

[0039] The liquid outlet pipe 610 is connected to the bottom end of the extrusion cylinder 67 through a drain check valve. The bottom of the extrusion cylinder 67 is also connected to an inlet pipe through an inlet check valve, which is suitable for connection to an external liquid supply device. The C-shaped cleaning frame 611 is fixed on the bottom surface of the mounting top plate 51 and is directly above the designated position of the contour roller 58. It is used to cover the contour roller 58 during cleaning. The liquid outlet horizontal pipe 612 is horizontally fixed inside the C-shaped cleaning frame 611 and one end is connected to the liquid outlet pipe 610. Several downward-aligned drip nozzles are connected along the straight direction on the liquid outlet horizontal pipe 612.

[0040] During the spraying and negative pressure pump suction strokes, when the horizontal cylinder 62 drives the C-shaped drive frame 63 forward, the extrusion wedge 66 fixed on its side moves synchronously, and its bottom slope actively contacts and gradually abuts against the piston drive end 68 below. Utilizing the wedge transmission principle of the inclined surface, the piston drive end 68 is forced to overcome the resistance of the limit spring 69 and press downward into the extrusion cylinder 67. At this time, the inlet check valve is closed under pressure, and the quantitative diluent in the extrusion cylinder 67 is expelled through the outlet pipe 610 and flows into the outlet horizontal pipe 612 in the C-shaped cleaning frame 611. Finally, it is discharged from several drip nozzles to the surface of the contour roller 58 below. Since the contour roller 58 is in a slow rotation state at this time, the discharged diluent can evenly cover and soften the paint adhering to the roller surface, improving the scraping efficiency.

[0041] When a single shutdown cleaning is completed, the horizontal cylinder 62 drives the C-shaped drive frame 63 back to the initial position, and the squeezing inclined block 66 then removes the downward pressure on the piston drive end 68. At this time, the compressed limit spring 69 instantly releases its elastic potential energy, pulls the piston drive end 68 upward in the opposite direction to reset, completes the entire pumping fluid cycle, and prepares for the spraying action of the next working cycle.

[0042] The specific workflow is as follows: During feeding, the linear motion module 31 drives the sliding frame 32 and the vertical push arm 33 to move. The feeding end 35 at the front end of the feeding claw 34 is limited by a one-way torsion spring and maintains hard contact with the end of the metal can, pushing it smoothly into the seam welding mechanism 2. It works with the welding wheel 23 and the guide wheel 25 to complete the longitudinal seam welding. During the retraction, the feeding end 35 is obstructed and can overcome the torsion spring force to deflect, thus smoothly avoiding the metal can waiting to be fed later.

[0043] After welding, the tank enters the discharge conveyor mechanism 4, where it is clamped and supported by the clamping belt unit 42 and the bottom support circular guide rail 12. It is then conveyed backward along the conveyor chain 11. When the in-situ sensor 52 detects that the metal tank has arrived, the paint dripping tube 53 drips paint onto the weld seam of the tank in a measured amount. Then, the lifting cylinder 54 extends and drives the U-shaped wheel frame 57 to move down through the lifting plate 55 and the sleeve rod 56, so that the contour roller 58 presses against the weld seam surface. As the downward stroke continues, the spring inside the sleeve rod 56 is compressed and deformed to generate a constant buffer force. The contour roller 58 rotates continuously due to the friction of the linear displacement of the tank conveyor, spreading the dripped paint evenly and pressing it onto the weld seam.

[0044] When the machine is stopped for cleaning after the coating is completed, the lifting cylinder 54 retracts, driving the sleeve rod 56, U-shaped wheel frame 57 and contour roller 58 to move up to the initial reset position. At this time, the trigger rod 571 is just flush with the bottom end of the ramp of the lifting block 65 under the C-shaped drive frame 63. Then the horizontal cylinder 62 is activated, pushing the C-shaped drive frame 63 to move horizontally forward along the sliding guide rail 64. First, the ramp at the front end of the lifting block 65 pushes the trigger rod 571, forcing the sleeve rod 56 to compress the spring, and further lifting the contour roller 58 into the internal space of the C-shaped cleaning frame 611. At this time, under the initial torque drive of the torsion spring, the C-shaped scraper 510 automatically adheres to the surface of the contour roller 58 and maintains a tight elastic contact.

[0045] Next, the extrusion block 66 fixed to the side of the C-shaped drive frame 63 presses the piston drive end 68 downward, causing it to overcome the limiting spring 69 and press into the extrusion cylinder 67. The diluent in the extrusion cylinder 67 opens the drain check valve and flows into the drain horizontal pipe 612 through the drain pipe 610, and is discharged downward through several drip nozzles. Simultaneously, the friction strip 632 on the bottom surface of the C-shaped drive frame 63 contacts and rubs with the friction rod 572, causing the contour roller 58 to rotate. The discharged diluent covers and softens the paint adhering to the surface of the contour roller 58. The C-shaped scraper 510 uses the elastic pressing blade to scrape off the adhering paint. The paint tilts and flows away along the C-shaped scraper 510, and finally collects in the collection box installed on the bottom bracket for unified collection.

[0046] After a single cleaning cycle, the horizontal cylinder 62 drives the C-shaped drive frame 63 back to its initial position, the squeezing inclined block 66 removes the downward pressure, the limit spring 69 releases its potential energy, the lifting piston drive end 68 resets and is pulled out, and the squeezing cylinder 67 draws a certain amount of diluent from the external liquid supply equipment by relying on the internal negative pressure, completing the pump liquid circulation and preparing for the spraying action of the next working cycle.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A post-weld surface treatment auxiliary device for a can-making seam welding machine, characterized in that, include: The can-pushing and feeding mechanism (3) is used to push the metal can body for feeding; The seam welding mechanism (2) is located downstream of the can-pushing and feeding mechanism (3) and is used to complete the longitudinal seam welding of the metal can body; The discharge conveying mechanism (4) is located downstream of the seam welding mechanism (2) and is used to convey the welded metal can. The pressure coating mechanism (5) is located above the material conveying mechanism (4) and includes a liquid supply unit, a coating unit, and a scraping unit located on one side of the coating unit. The liquid supply unit is used to drip paint onto the weld. The coating unit has a contour roller (58) for pressing the weld. The scraping unit has a C-shaped scraper (510). The C-shaped scraper (510) abuts against the contour roller (58) and is used to scrape the paint off the contour roller (58) when it moves to a specified position. The processing mechanism (6) is disposed on the side of the pressure coating mechanism (5), including a trigger unit that moves towards the coating unit and a supply unit disposed on the side of the trigger unit. The trigger unit has an inclined end for lifting the contour roller (58) and a friction end for frictionally driving the contour roller (58) to rotate. The supply unit abuts against the trigger unit and is used to guide the contour roller (58) to rotate and scrape off the paint and discharge the diluent from the supply unit when the trigger unit is displaced. The coating mechanism (5) also includes a mounting top plate (51); The coating unit includes a lifting cylinder (54), a lifting plate (55), a sleeve rod (56), and a U-shaped wheel frame (57). The lifting cylinder (54) is vertically fixed to the side of the mounting top plate (51) via a side frame (541) to provide power for vertical displacement. The lifting plate (55) is fixed to the telescopic end of the lifting cylinder (54). The sleeve rod (56) consists of two interlocking rods with a spring connecting the interlocking ends of the two rods. One rod is vertically fixed to the lifting plate (55). The U-shaped wheel frame (57) is horizontally fixed to the bottom end of the other rod. The contour roller (58) is rotatably mounted on the U-shaped wheel frame (57) for pressing down on the weld seam. The triggering unit includes a mounting side plate (61), a horizontal cylinder (62), a C-shaped drive frame (63), a slider (631), and a sliding guide rail (64). The mounting side plate (61) is fixed on the discharge conveying mechanism (4). The horizontal cylinder (62) is horizontally arranged on the mounting side plate (61). The C-shaped drive frame (63) is fixed to the telescopic end of the horizontal cylinder (62). The slider (631) is fixed to the upper surface of the C-shaped drive frame (63). The sliding guide rail (64) is fixed to the bottom surface of the mounting top plate (51) and slides with the slider (631) to provide linear guidance for the displacement of the C-shaped drive frame (63). The application unit also includes a trigger rod (571) and a friction rod (572). The trigger rod (571) is horizontally fixed to the side of the U-shaped wheel frame (57). The friction rod (572) is coaxially fixed to the central axis of the contour roller (58). The inclined end includes a lifting block (65). The friction end includes a friction strip (632). The lifting block (65) is fixed to the upper surface of the lower horizontal end of the C-shaped drive frame (63) and has a sloping front end. The friction strip (632) is fixed to the bottom surface of the upper horizontal end of the C-shaped drive frame (63). When the lifting cylinder (54) retracts to its initial state, and the horizontal cylinder (62) drives the C-shaped drive frame (63) to move, the front ramp of the lifting block (65) is adapted to abut against the trigger rod (571) to lift the contour roller (58), and the friction strip (632) is adapted to contact the friction rod (572) to drive the contour roller (58) to rotate by sliding friction.

2. The auxiliary device for post-weld surface treatment of a can-making seam welding machine according to claim 1, characterized in that: The mounting top plate (51) is fixed on the discharge conveying mechanism (4). The liquid supply unit includes a position sensor (52) and a paint dripping tube (53). The position sensor (52) is set on the side of the mounting top plate (51) to sense the metal tank in place. The paint dripping tube (53) is vertically set on the mounting top plate (51) and aligned with the weld position, with one end suitable for connection to an external liquid supply device, for dripping paint onto the weld.

3. The auxiliary device for post-weld surface treatment of a can-making seam welding machine according to claim 2, characterized in that: The scraping unit also includes a rotating frame (59), one end of which is rotatably mounted on the bottom surface of the mounting top plate (51) via a torsion spring. The C-shaped scraper (510) is inclinedly mounted on the rotating frame (59). The torsion spring is adapted to apply an initial torque to the rotating frame (59) so that the C-shaped scraper (510) always maintains an elastic contact with the contour roller (58) to scrape off the paint when the contour roller (58) approaches and reaches the designated position.

4. The auxiliary device for post-weld surface treatment of a can-making seam welding machine according to claim 3, characterized in that: The triggering unit also includes a squeezing wedge (66), which is fixed to the side of the C-shaped drive frame (63) and is used to abut against the supply unit. The supply unit includes a squeezing cylinder (67), a piston drive end (68), a limiting spring (69), and a liquid outlet pipe (610). The squeezing cylinder (67) is fixed to the inner side of the mounting top plate (51) by a clamp. One end of the piston drive end (68) extends movably into the inside of the squeezing cylinder (67) and is correspondingly arranged with the squeezing inclined block (66). The limiting spring (69) is sleeved on the piston drive end (68) and its two ends are respectively connected to the protrusions at one end of the squeezing cylinder (67) and the piston drive end (68), which are used to initially limit the piston drive end (68) to be in a stretched state relative to the squeezing cylinder (67). The liquid outlet pipe (610) is connected to the bottom end of the squeezing cylinder (67) through a one-way valve. The bottom of the squeezing cylinder (67) is also connected to an inlet pipe through a one-way valve and is suitable for connection with an external liquid supply device.

5. The auxiliary device for post-weld surface treatment of a can-making seam welding machine according to claim 4, characterized in that: The supply unit also includes a C-shaped cleaning frame (611) and a liquid outlet horizontal pipe (612). The C-shaped cleaning frame (611) is fixed to the bottom surface of the mounting top plate (51) and is located directly above the contour roller (58) to cover the contour roller (58) during cleaning. The liquid outlet horizontal pipe (612) is horizontally fixed inside the C-shaped cleaning frame (611) and one end is connected to the liquid outlet pipe (610). Several drip nozzles are connected along the straight direction on the liquid outlet horizontal pipe (612) to discharge diluent onto the surface of the contour roller (58).

6. The auxiliary device for post-weld surface treatment of a can-making seam welding machine according to claim 1, characterized in that: It also includes a can-making machine frame (1), and the can-pushing and feeding mechanism (3) includes a linear motion module (31), a sliding frame (32), a vertical push arm (33) and a pusher claw (34). The sliding frame (32) is mounted on the linear motion module (31), the vertical push arm (33) is fixed on the sliding frame (32), and the pusher claw (34) is mounted at the bottom of the vertical push arm (33) for abutting and pushing the edge of the metal can into the seam welding mechanism (2).

7. The auxiliary device for post-weld surface treatment of a can-making seam welding machine according to claim 6, characterized in that: The seam welding mechanism (2) includes a seam welding head (21), a voltage guide wheel (22), an upper welding wheel (23), an auxiliary frame (24), and a guide wheel (25). The seam welding head (21) is located on the side of the can-making machine frame (1). The voltage guide wheel (22) and the upper welding wheel (23) are both located on the seam welding head (21). The guide wheel (25) is located on the can-making machine frame (1) via the auxiliary frame (24) to adapt to the curvature of the metal can surface. The can-making machine frame (1) is also equipped with a welding wheel bracket (26) via a support.

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