A straight seam welding machine

Abstract

This invention relates to the field of welding machines, specifically a straight seam welding machine. The machine includes a welding head and a base box located on the lower side. A side plate is fixedly connected to the upper rear end of the base box, and a fixing frame is fixedly connected to the front end of the side plate. A circumferential support component capable of changing diameter is installed at the front end of the fixing frame. Shaping components capable of moving inward are respectively arranged on the left and right sides of the circumferential support component. A lifting component capable of lifting and lowering is installed at the upper end of the side plate. A linkage structure is installed between the lifting component and the shaping components on both sides. The welding head is mounted on the lifting component. This invention sets two working states: cylindrical workpiece welding and flat workpiece welding. Both share the core mechanisms of drive, linkage, lifting, and welding, allowing for rapid switching of working conditions without structural changes. Furthermore, the use of a radially expandable circumferential support component enables adaptive adjustment of the support diameter, quickly adapting to cylindrical workpieces with different inner diameters.

Description

Technical Field

[0001] This invention relates to the field of welding machines, and in particular to a straight seam welding machine. Background Technology

[0002] Straight seam welding equipment, as a core piece of equipment for metal joining, is mainly used to achieve longitudinal continuous weld formation of plates and pipes, effectively improving the welding accuracy and efficiency of plates and pipes. Currently, traditional straight seam welding equipment generally suffers from problems such as limited functionality, poor adaptability, low automation, and unstable weld quality in practical production applications. Most existing equipment can only perform welding operations on a single type of workpiece; dedicated welding equipment is required for cylindrical and flat workpieces, as illustrated by Chinese patents with publication numbers CN120023470B and CN218193554U. This results in high equipment investment costs, large footprint, and low changeover efficiency, making it difficult to meet the needs of multi-variety, small-batch production.

[0003] Furthermore, in the welding process of cylindrical workpieces, traditional support structures are mostly of fixed size and cannot be adjusted according to the inner diameter of the workpiece. It is necessary to replace the support components according to the diameter of the welded part, resulting in poor versatility of the support structure. In the welding process of flat workpieces, traditional clamping methods mostly use mechanical fixation such as bolts and pressure plates. Moreover, when welding at different angles, it is necessary to reload the clamps, which is cumbersome, inefficient, and prone to causing damage such as indentations and scratches on the workpiece surface. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides a straight seam welding machine, which effectively solves the problems mentioned in the background art.

[0005] The technical solution adopted by the present invention to solve the above problems is as follows: A straight seam welding machine includes a welding head and a base box located on the lower side. A side plate is fixedly connected to the upper rear end of the base box, and a fixing frame is fixedly connected to the front end of the side plate. A circumferential support component capable of changing diameter is installed at the front end of the fixing frame. Shaping components capable of moving inward are respectively provided on the left and right sides of the circumferential support component. A drive device capable of controlling the two shaping components to move inward is installed inside the base box. The upper end of the side plate is equipped with a lifting assembly that can be raised and lowered. The lifting assembly and the shaping assemblies on both sides are connected by a linkage structure. When the shaping assemblies on both sides move inward under the action of the linkage structure, the lifting assembly moves downward. The welding head is mounted on the lifting assembly, which is equipped with a drive unit capable of controlling the welding head to reciprocate along the axial direction of the circumferential support assembly.

[0006] Preferably, the circumferential support assembly includes a horizontally arranged intermediate cylinder with one end fixedly connected to the fixed frame. Multiple adjusting plates are evenly arranged on the outer side of the intermediate cylinder. A bidirectional screw is rotatably connected to the center of the intermediate cylinder. An adjusting knob is fixedly connected to the front end of the bidirectional screw. Moving blocks are threadedly connected to both sides of the bidirectional screw. Hinged rods are hinged to both sides of the inner end of each adjusting plate. The other end of each hinged rod is hinged to a corresponding moving block. A strip-shaped opening penetrating the intermediate cylinder is axially formed on the surface of the intermediate cylinder corresponding to the hinged rod, for accommodating the connection between the hinged rod and the moving block.

[0007] Preferably, the outer ends of the adjusting plate are respectively fixedly connected with copper plates for heat conduction.

[0008] Preferably, the surface of the fixing frame is vertically provided with radius scales on both sides, and the two ends of the adjustment plate located on the lower side are fixedly connected with pointers corresponding to the radius scales.

[0009] Preferably, the shaping component includes a central beam and hinged inclined plates on the upper and lower sides of the central beam. The outer ends of the inclined plates are inclined inward. A worm gear is fixedly connected coaxially to the hinge point where the front end of the inclined plate is hinged to the central beam. A worm is meshed between the two worm gears. The worm is rotatably connected to the central beam. A control knob is fixedly connected to one end of the worm.

[0010] Preferably, the surface of the upper opening and closing inclined plate has a rectangular opening, and a support plate is provided inside the rectangular opening. The inner end of the support plate is fixedly connected to the front and rear sides of the plate, and the rotating shaft is rotatably connected to the inner wall of the rectangular opening. A brake gear is splinedly connected to the surface of the front rotating shaft. A brake tooth plate is meshed on one side of the brake gear. The brake tooth plate is slidably connected to the surface of the opening and closing inclined plate. A brake spring is fixedly connected to the side of the brake tooth plate away from the brake gear. The other end of the brake spring is fixedly connected to the opening and closing inclined plate. A reinforcing knob is threadedly connected to the front side of the front rotating shaft.

[0011] Preferably, a plurality of magnetic plates are fixedly connected to the upper surface of the support plate.

[0012] Preferably, the driving device includes a drive motor fixedly connected inside the base box and a guide column rotatably connected inside the base box. The guide column has helical grooves with opposite rotation directions on both sides of its surface. A drive gear is coaxially fixedly connected to the power output end of the drive motor, and a driven gear is coaxially fixedly connected to one end of the guide column. The drive gear and the driven gear mesh and transmit power. A movable frame is provided at the outer end of the intermediate beam. The movable frame is horizontally slidably connected to the base box, and an elastic buffer rod is installed between the movable frame and the corresponding intermediate beam. A mating pin is fixedly connected to the lower end of each movable frame, and the lower end of each mating pin meshes with the corresponding helical groove.

[0013] Preferably, the lifting assembly includes a top plate, with brackets fixedly connected to both rear ends of the top plate, and an installation guide rail installed on the lower side of the top plate. The installation guide rail is parallel to the intermediate cylinder, and elastic buffer rods are also installed between the top plate and the two ends of the installation guide rail. A movable slider is slidably connected to the surface of the installation guide rail along its length. An installation hole is opened in the middle of the movable slider, and a welding head is threaded into the inner side of the installation hole and located on the lower side of the installation guide rail. An mounting plate is fixedly connected to the upper end of the mounting guide rail, and a connecting plate is fixedly connected to the surface of the movable slider. The connecting plate and the mounting plate are slidably connected along the length of the connecting plate. The driving unit includes a driving screw rotatably connected to the outer end of the mounting plate. The connecting plate is threadedly connected to the driving screw. A control motor is fixedly connected to the rear end of the mounting plate, and the output end of the control motor is coaxially fixedly connected to one end of the driving screw.

[0014] Preferably, the linkage structure includes a guide plate fixedly connected to the upper rear side of the movable frame, the upper end of the guide plate is provided with a guide groove and the upper end of the guide groove is inclined inward, and the outer end of the bracket is fixedly connected with a guide pin, the guide pin slidingly engaging with the guide groove.

[0015] This invention features a novel structure, ingenious design, and simple and convenient operation, offering the following advantages compared to existing technologies: 1. This invention sets up two working states: cylindrical workpiece welding and flat workpiece welding. They share the core mechanisms of drive, linkage, lifting and welding. The working conditions can be quickly switched without changing the structure. This overcomes the shortcomings of traditional equipment with single function, realizes multi-purpose use, greatly reduces equipment investment costs and changeover time, and improves the versatility and applicability of the equipment. 2. This invention employs a radially extendable circumferential support assembly. Through the linkage structure of the adjustment knob, bidirectional screw, hinge rod, and adjustment plate, the support diameter can be adaptively adjusted. Combined with the pointer and radius scale, accurate readings can be achieved. It can quickly adapt to cylindrical workpieces with different inner diameter specifications, providing uniform and stable support and effectively ensuring the roundness accuracy of the workpiece. Attached Figure Description

[0016] Figure 1 This is a first schematic diagram of the overall structure of a straight seam welding machine according to the present invention.

[0017] Figure 2 This is a second schematic diagram of the overall structure of a straight seam welding machine according to the present invention.

[0018] Figure 3 This is a schematic diagram of the circumferential support component structure of a straight seam welding machine according to the present invention.

[0019] Figure 4 This is an exploded view of the circumferential support component structure of a straight seam welding machine according to the present invention.

[0020] Figure 5 This is a schematic diagram of the radius scale structure of a straight seam welding machine according to the present invention.

[0021] Figure 6 This is a schematic diagram of the opening and closing inclined plate installation structure of a straight seam welding machine according to the present invention.

[0022] Figure 7 This invention relates to a straight seam welding machine. Figure 6 A magnified schematic diagram of the local structure at point K.

[0023] Figure 8 This is a first schematic diagram of the drive device structure of a straight seam welding machine according to the present invention.

[0024] Figure 9 This is a second schematic diagram of the drive device structure of a straight seam welding machine according to the present invention.

[0025] Figure 10 This is a schematic diagram of the connection structure between the lifting assembly and the linkage structure of a straight seam welding machine according to the present invention.

[0026] Figure 11 This is a schematic diagram of the welding head installation structure of a straight seam welding machine according to the present invention.

[0027] Figure 12 This is a schematic diagram of the pressure plate installation structure of a straight seam welding machine according to the present invention.

[0028] Figure 13 This is a schematic diagram of the elastic buffer rod structure of a straight seam welding machine according to the present invention.

[0029] Numbering in the diagram: 1-Base box, 2-Side plate, 3-Intermediate cylinder, 4-Strip opening, 5-Double-direction screw, 6-Moving block, 7-Adjusting knob, 8-Hinge rod, 9-Adjusting plate, 10-Copper plate, 11-Fixing bracket, 12-Radius scale, 13-Pointer, 14-Moving bracket, 15-Guide post, 16-Matching pin, 17-Driven gear, 18-Drive gear, 19-Drive motor, 20-Helical groove, 21-Elastic buffer rod, 211-Buffer cylinder, 212-Buffer rod, 213-Buffer spring, 214-Baffle, 22-Intermediate beam, 23-Opening 24-Inclined plate, 25-Worm gear, 26-Control knob, 27-Support plate, 28-Magnetic plate, 29-Brake gear, 30-Brake tooth plate, 31-Brake spring, 32-Reinforcement knob, 33-Rotating shaft, 34-Outrigger, 35-Guide plate, 36-Guide groove, 37-Top plate, 38-Bracket, 39-Guide pin, 40-Mounting guide rail, 41-Mounting port, 42-Moving slider, 43-Welding head, 44-Mounting plate, 45-Drive screw, 46-Control motor, 47-Pressure plate, 48-Connecting plate, 50-Limit rod. Detailed Implementation

[0030] The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0031] like Figure 1-13 As shown, the present invention provides a straight seam welding machine, including a welding head 43 and a base box 1 located on the lower side. Support legs 34 are fixedly connected to the four corners of the lower end of the base box 1 to assist in the stable placement of the base box 1. A side plate 2 is fixedly connected to the upper rear end of the base box 1, and a fixing frame 11 is fixedly connected to the front end of the side plate 2. A circumferential support assembly capable of changing diameter is installed at the front end of the fixing frame 11. The circumferential support assembly provides stable circumferential support for the cylindrical workpiece, ensuring that the workpiece does not deform or collapse during shaping and welding. The outer diameter of the support can be flexibly adjusted according to the inner diameter of the workpiece to adapt to cylindrical workpieces of different specifications. The left and right sides of the circumferential support assembly are respectively provided with shaping components that can move inward. The shaping components are used to center, clamp and shape the cylindrical workpiece from both sides, so that the gap to be welded on the workpiece is aligned and tightly fitted, eliminating gap deviation before welding. The bottom box 1 is equipped with a drive device that can control the two shaping components to move inward. The drive device provides synchronous and stable moving power to the shaping components, ensuring that the shaping force on both sides is consistent and avoiding workpiece skewing.

[0032] This invention forms a stable installation foundation for the entire machine by using the base box 1 and the side plate 2. It modularly integrates the three core functions of circumferential support, lateral shaping, and power drive. The components work together without interfering with each other, and can quickly adapt to the clamping and positioning of cylindrical workpieces with various inner diameters. Under the dual constraints of support and shaping, the workpiece is subjected to uniform force and reliable positioning, which can fundamentally reduce the occurrence rate of defects such as workpiece displacement, warping, and uneven gaps before welding. It significantly improves the equipment's universal adaptability and clamping and positioning accuracy, and lays a stable structural foundation for subsequent high-quality straight seam welding.

[0033] The upper end of the side plate 2 is equipped with a lifting assembly that can be raised and lowered. The lifting assembly is used to drive the welding head 43 to adjust its height up and down to match the welding height of workpieces with different diameters. At the same time, it drives the pressure structure to press down so that the edge to be welded fits tightly. The lifting assembly and the shaping assemblies on both sides are connected by a linkage structure. When the shaping assemblies on both sides move inward under the action of the linkage structure, the lifting assembly moves downward. The linkage structure achieves mechanical synchronization of the shaping and pressing actions, eliminating the need for independent control of the lifting component, simplifying the operation process, and ensuring that the welding head 43 immediately enters the working height after shaping, improving the continuity of operation and welding accuracy. The shaping component has a V-shaped structure with the opening facing inward. When the shaping component is used to weld cylindrical components, it is used to press the cylindrical welded parts against the circumferential support component for shaping. Then, the lifting component moves downward to press against the two welding ends of the cylindrical welded structure. Through step-by-step shaping and pressing, the roundness and centering of the workpiece are ensured first, and then the weld is pressed, effectively avoiding problems such as misalignment, excessive gaps, and incomplete welding during welding, thus ensuring welding quality. The welding head 43 is mounted on the lifting assembly, and the lifting assembly is equipped with a drive unit that can control the welding head 43 to reciprocate along the axial direction of the circumferential support assembly. The drive unit provides stable axial movement power to the welding head 43, so as to realize continuous and uniform welding of straight seams and ensure that the weld formation is uniform and consistent.

[0034] The lifting assembly and linkage structure work together to achieve mechanical synchronization of the shaping and pressing welding actions, eliminating the need for an independent electrical control system and manual adjustment. The structure responds quickly, the timing of actions is precise, and the failure rate is low. The shaping and pressing process first ensures the roundness of the workpiece and its alignment with the center of the shaping assembly and surface fit, and then forces the weld edges to fit, which can significantly reduce welding defects such as misalignment, uneven gaps, incomplete welding, and burn-through, and effectively improve the strength and appearance quality of the welded joint. The drive unit drives the welding head 43 to move axially at a uniform speed, which can ensure uniform and stable welding heat input, so that the weld width, weld depth and mechanical properties of the straight seam weld are highly consistent, which greatly improves the qualification rate of the welded product.

[0035] like Figure 3 and Figure 4 As shown, the circumferential support assembly includes a horizontally positioned intermediate cylinder 3 with one end fixedly connected to the fixed frame 11. Multiple adjusting plates 9 are evenly arranged on the outer side of the intermediate cylinder 3. A bidirectional screw 5 is rotatably connected to the middle of the intermediate cylinder 3. An adjusting knob 7 is fixedly connected to the front end of the bidirectional screw 5. Moving blocks 6 are threadedly connected to both sides of the bidirectional screw 5. Hinge rods 8 are hinged to both sides of the inner end of the adjusting plates 9. The other end of each hinge rod 8 is hinged to a corresponding moving block 6. A through-hole 4 is axially formed on the surface of the intermediate cylinder 3 corresponding to the hinge rod 8, used to accommodate the connection between the hinge rod 8 and the moving block 6. Rotating the adjusting knob 7 drives the bidirectional screw 5 to rotate, causing the moving blocks 6 on both sides to move synchronously towards or away from each other. The hinge rods 8 push the adjusting plates 9 to synchronously extend and retract radially, achieving continuous adjustment of the support diameter. The multiple adjusting plates 9 are evenly distributed, ensuring balanced support force and effectively preventing local deformation of the cylindrical workpiece, thus guaranteeing the roundness accuracy of the workpiece.

[0036] During use, a radial telescopic structure with a two-way screw 5 and a hinged rod 8 is employed, enabling continuous stepless adjustment of the support diameter. The adjustment process is smooth and stable with high positioning accuracy. Multiple adjustment plates 9 are evenly distributed along the circumference, ensuring that the inner wall of the workpiece bears uniform radial support force without local stress concentration. This effectively suppresses deformations such as ellipticization and local depressions in cylindrical workpieces under welding high temperatures and clamping forces, precisely ensuring the roundness and shape accuracy of the workpiece. Structurally, this avoids problems such as weld stretching and twisting caused by unstable support.

[0037] The outer ends of the adjustment plate 9 are respectively fixedly connected to copper plates 10 for heat conduction; the copper plates 10 have high thermal conductivity and can quickly disperse the heat transferred to the adjustment plate 9 during welding, avoid the adjustment plate 9 from deforming due to high temperature, reduce the heat from burning the inner wall of the workpiece, protect the surface quality of the workpiece, and extend the service life of the circumferential support assembly.

[0038] Based on the excellent thermal conductivity and heat dissipation performance of copper plate 10, the heat conducted to the support structure during the welding process can be quickly diffused and dissipated, effectively reducing the risk of thermal deformation and thermal fatigue failure of adjustment plate 9 caused by high temperature accumulation, and ensuring long-term stability of support dimensions; at the same time, it can reduce the concentrated conduction of high temperature to the inner wall of the workpiece, avoid problems such as ablation, discoloration and accelerated oxidation of the inner wall of the workpiece, significantly improve the surface forming quality and integrity of the workpiece, slow down the aging rate of support components, and extend the overall service life and maintenance cycle of the equipment.

[0039] like Figure 5As shown, the fixed frame 11 has vertical radius scales 12 on both sides of its surface. The two ends of the adjustment plate 9 located on the lower side are fixedly connected to pointers 13 corresponding to the radius scales 12. The pointers 13 cooperate with the radius scales 12 to read the current support radius value intuitively and accurately. No additional measuring tools are needed to quickly match the inner diameter of the workpiece, thereby improving adjustment efficiency and accuracy.

[0040] The combination of pointer 13 and radius scale 12 forms a visual and precise reading structure, allowing operators to directly and quickly read the current support radius value without the need for external measuring tools such as calipers or feeler gauges, thus significantly shortening the workpiece changeover and adjustment time. The intuitive and clear readings can effectively avoid dimensional deviations caused by human estimation, ensuring that the support radius and the inner diameter of the workpiece are highly matched, improving adjustment accuracy and work efficiency, and reducing the reliance on operator experience.

[0041] like Figures 6-7 As shown, the shaping component includes a central beam 22 and hinged opening and closing inclined plates 23 on the upper and lower sides of the central beam 22. The outer ends of the opening and closing inclined plates 23 are inclined inward. A worm gear 24 is fixedly connected coaxially to the hinge point where the front end of the opening and closing inclined plate 23 is hinged to the central beam 22. A worm 25 meshes between the two worm gears 24. The worm 25 is rotatably connected to the central beam 22. A control knob 26 is fixedly connected to one end of the worm 25. In use, the control knob 26 is turned by hand to drive the worm 25 to rotate. Through the meshing transmission between the worm 25 and the worm gears 24, the upper and lower opening and closing inclined plates 23 are driven synchronously. Preferably, the control knob 26 can be rotated using a wrench or other tools during use. Alternatively, the control knob 26 can be replaced with a servo motor for control and drive. By controlling the included angle of the two opening and closing inclined plates 23, cylindrical workpieces of different diameters can be used for welding. By adjusting the angle of the two opening and closing inclined plates 23, the inclined plates 23 can press against the surface of the workpiece near the weld, making the force on the cylindrical workpiece closer to the weld, further improving the alignment effect of the weld. The worm gear structure has a self-locking characteristic, and the opening and closing inclined plates 23 will not loosen on their own after adjustment, ensuring clamping stability.

[0042] In specific operation, a synchronous transmission structure of worm gear 25 driving double worm wheels 24 is adopted, which can ensure that the upper and lower opening and closing inclined plates 23 open and close with the same angular velocity and symmetrical angle, ensuring that the force on both sides of the workpiece is uniform and symmetrical, and the centering is accurate. Moreover, the opening and closing amplitude of the inclined plates 23 can be adjusted according to the diameter of the cylindrical welded parts, and adaptive adjustments can be made as needed. The worm gear has a large transmission ratio, low speed, large torque and reverse self-locking characteristics. The adjustment process is smooth and shock-free. After clamping in place, it can maintain the clamping state for a long time without loosening or rebounding. It can effectively resist the influence of welding vibration, significantly improve the shaping accuracy and clamping reliability, and provide a stable guarantee for the accurate alignment of the weld.

[0043] Furthermore, in order to broaden the scope of application of the present invention, such as... Figures 6-7 As shown, a rectangular opening is provided on the surface of the upper opening and closing inclined plate 23. A support plate 27 is provided inside the rectangular opening. Rotating shafts 33 are fixedly connected to the front and rear sides of the inner end of the support plate 27, and the rotating shafts 33 are rotatably connected to the inner wall of the rectangular opening. The support plate 27 can swing freely around the rotating shafts 33, so that the equipment can be adapted to welding cylindrical workpieces and can also place flat workpieces, realizing multiple uses of one machine. The support plate 27 can swing up and down around the rotation shaft 33. Two corresponding support plates 27 correspond to each other and can hold flat welded parts, facilitating welding of flat welded parts. By adjusting the angle of the two support plates 27, straight seam welding of flat welded parts at different angles can be performed. The settings and adjustments can be made according to the user's needs. During adjustment, the support plate 27 is swung outward to a horizontal position, and the flat welded part is placed on the horizontally placed support plate 27 for welding. When two flat welded parts need to be welded at a certain angle, the support plate 27 can be controlled to swing to the corresponding angle to support the flat welded parts, facilitating welding of the flat welded parts at the specified angle. The surface of the rotation shaft 33 on the front side is splined with a brake gear 29. One side of the brake gear 29 meshes with a brake tooth plate 30. The brake tooth plate 30 and the opening and closing inclined plate 23 are connected by a brake gear 29. The brake plate 30 is slidably connected to the brake gear 29, with a brake spring 31 fixedly connected to the side of the brake tooth plate 30 away from the brake gear 29. The other end of the brake spring 31 is fixedly connected to the opening and closing inclined plate 23. The brake spring 31 continuously pushes the brake tooth plate 30 to mesh with the brake gear 29, realizing automatic locking of the angle of the support plate 27. After adjusting the angle, it can remain stable without additional fixing. A reinforcing knob 32 is threadedly connected to the front side of the rotating shaft 33. The width of the brake gear 29 is greater than the width of the brake tooth plate 30, so that the brake gear 29 can move along the axial direction of the rotating shaft 33 without being blocked by the brake tooth plate 30. By tightening the reinforcing knob 32, the brake gear 29 can be further pressed, so that the brake gear 29 and the end face of the opening and closing inclined plate 23 are tightly fitted, the friction is increased, and the firmness of the support plate 27 is further improved, ensuring that the support plate 27 does not shift at an angle under welding vibration, and improving welding stability.

[0044] The angularly swingable support plate 27 structure enables the equipment to be compatible with straight seam welding operations on both cylindrical and flat workpieces, greatly expanding the equipment's application scenarios and processing range, and achieving multi-functionality. The elastic automatic locking mechanism, composed of a brake gear 29, a brake tooth plate 30, and a brake spring 31, together with the reinforced knob 32, forms a double mechanical locking structure. The locking is reliable and has strong vibration resistance, maintaining angular stability without drifting under continuous welding vibration. This meets the high-precision positioning requirements for straight seam welding at different angles, significantly improving the equipment's versatility and welding stability.

[0045] Multiple magnetic plates 28 are fixedly connected to the upper surface of the support plate 27. The magnetic plates 28 can quickly attract and fix flat workpieces. The magnetic strength of the magnetic plates 28 is mainly sufficient to attract flat welded parts. If the flat workpieces are not aligned when placed, they can be manually adjusted without excessive magnetic force. By attracting the welded workpieces with the magnetic plates 28, the cumbersome clamping steps of traditional fixtures are eliminated. The clamping is efficient and the positioning is accurate, preventing the workpieces from shifting during the welding process.

[0046] The magnetic plate 28 adsorption-type fixing structure eliminates the need for traditional mechanical clamps such as bolts and pressure plates, making clamping and disassembly operations simple and quick, which can significantly shorten the auxiliary time for workpiece clamping and improve the overall processing efficiency. The magnetic adsorption force is uniform and will not produce mechanical damage such as indentations or scratches on the workpiece surface, which helps to maintain the integrity of the workpiece surface. At the same time, the adsorption positioning accuracy is high and the constraint is reliable, which can effectively prevent the workpiece from moving or shifting during welding and ensure the accurate position of the weld.

[0047] like Figure 8As shown, the driving device includes a drive motor 19 fixedly connected inside the base box 1 and a guide column 15 rotatably connected inside the base box 1. The drive motor 19 is a self-locking motor, used to stably drive the guide column 15 to rotate and give the guide column 15 a self-locking effect. The guide column 15 has spiral grooves 20 with opposite rotation directions on both sides of its surface. A drive gear 18 is coaxially fixedly connected to the power output end of the drive motor 19, and a driven gear 17 is coaxially fixedly connected to one end of the guide column 15. The drive gear 18 and the driven gear 17 mesh and transmit power. The drive motor 19 drives the guide column 15 to rotate through the meshing transmission of the drive gear 18 and the driven gear 17, resulting in smooth transmission, precise power transmission, and ensuring uniform rotation speed of the guide column 15. A movable frame 14 is provided at the outer end of the intermediate beam 22. The movable frame 14 is horizontally slidably connected to the base box 1, and an elastic buffer rod 21 is installed between the movable frame 14 and the corresponding intermediate beam 22. The punch 21 includes a buffer cylinder 211 with an open upper end, a buffer rod 212 slidably connected to the upper opening of the buffer cylinder 211, and a buffer spring 213 inside the buffer cylinder 211. A baffle 214 is fixedly connected to the lower end of the buffer rod 212. The baffle 214 slides with the inner wall of the buffer cylinder 211 and is located above the buffer spring 213. The whole assembly forms an elastic telescopic component, which is buffered and elastically reset by the buffer spring 213. The elastic buffer rod 21 can buffer the pressure plate 47 pressing against the weld bead. The rigid impact force applied during the compression alignment of the weld seam is used to prevent excessive pressure from damaging the workpiece and to provide overload protection. The lower end of the moving frame 14 is fixedly connected to a mating pin 16, and the lower end of the mating pin 16 engages with the corresponding spiral groove 20 for transmission. When the guide column 15 rotates, the spiral grooves 20 on both sides rotate in opposite directions, causing the mating pin 16 and the moving frame 14 to move synchronously towards each other, so as to realize the synchronous centering movement of the shaping components on both sides, ensuring that the workpiece is subjected to symmetrical force and accurately centered.

[0048] The drive motor 19, in conjunction with the drive gear 18 and the driven gear 17, provides stable power output, high transmission efficiency, and precise speed control, ensuring uniform and reliable rotational power for the guide column 15. The double-helical groove 20 on the surface of the guide column 15 can drive the two sides of the shaping components to achieve high-precision synchronous centering movement, with small centering error and symmetrical force on the workpiece, effectively ensuring that the center of the workpiece coincides with the welding center. The elastic buffer rod 21 can absorb the rigid impact and overload force during the shaping process, preventing the workpiece from being crushed or deformed, while also providing overload protection for the drive mechanism and the shaping mechanism, improving the safety and service life of the equipment.

[0049] like Figure 9 and Figure 10As shown, the lifting assembly includes a top plate 37, with brackets 38 fixedly connected to both rear ends of the top plate 37. Vertically arranged limiting rods 50 are slidably connected to the surfaces of the brackets 38. The limiting rods 50 are fixedly connected to the side plates 2, and a circular plate is fixedly connected to the bottom of the limiting rods 50 to prevent the top plate 37 from detaching from the limiting rods 50. Under the action of the limiting rods 50, the top plate 37 can move up and down stably. The limiting rods 50 provide vertical guidance for the top plate 37, restricting horizontal swaying and ensuring stable up and down movement of the lifting assembly.

[0050] A mounting guide rail 40 is installed on the lower side of the top plate 37. The mounting guide rail 40 is parallel to the intermediate cylinder 3. Elastic buffer rods 21 are also installed between the top plate 37 and both ends of the mounting guide rail 40. The elastic buffer rods 21 can buffer the impact force when the welding head 43 is pressed down, avoiding rigid contact damage to the workpiece, while ensuring uniform and gentle pressing force. A movable slider 42 is slidably connected to the surface of the mounting guide rail 40 along its length. A mounting hole is opened in the middle of the movable slider 42. The welding head 43 is threaded into the inner side of the mounting hole and is located on the lower side of the mounting guide rail 40. By rotating the welding head 43, the distance between the welding head 43 and the workpiece can be finely adjusted under the action of the threaded connection to accommodate workpieces of different thicknesses. The surface of the mounting guide rail 40 along its length... An installation port 41 is provided in the direction of the welding head 43. The welding end of the welding head 43 extends through the installation port 41 to the lower side of the installation guide rail 40. A pressure plate 47 is fixedly connected to both sides of the lower end of the installation port 41. The lower end of the pressure plate 47 is inclined outward. When the installation guide rail 40 moves downward and welding is performed by the welding head 43, the pressure plate 47 can press down on the two ends to be welded, so that the two ends to be welded can be effectively aligned. The vertical height of the pressure plate 47 can limit the distance between the welding head 43 and the workpiece, so that the welding head 43 is kept within the rated distance range that can perform its function when welding the workpiece. The inclined pressure plate 47 can adaptively fit the two sides of the weld seam of the workpiece, press the weld seam before the welding head 43, eliminate gaps and misalignments, provide stable welding conditions for straight seam welding, and can significantly improve the welding quality.

[0051] During operation, the elastic buffer rod 21 provides flexible downward pressure cushioning, which can prevent the welding head 43 and the pressure plate 47 from generating rigid impact on the workpiece, protecting the workpiece surface from being crushed or deformed; the inclined pressure plate 47 has self-adaptive fitting capability. When the inclined pressure plate 47 is pressed down, it can squeeze the weld seams at both ends of the cylindrical welded part through the inner wall, so that the weld seams at both ends are aligned. Before welding, defects such as weld seam misalignment and uneven gaps are eliminated in advance, providing stable and fitting joint conditions for welding; in conjunction with the stable installation guide rail 40 and the linear movement of the moving slider 42, the weld seam forming quality can be further improved.

[0052] An mounting plate 44 is fixedly connected to the upper end of the mounting guide rail 40. A connecting plate 48 is fixedly connected to the surface of the movable slider 42. The connecting plate 48 and the mounting plate 44 are slidably connected along the length. A sliding opening is provided on the surface of the mounting plate 44 along the length direction. The connecting plate 48 is slidably connected to the sliding opening. The driving unit includes a driving screw 45 rotatably connected to the outer end of the mounting plate 44. The connecting plate 48 and the driving screw 45 are threadedly connected. A control motor 46 is fixedly connected to the rear end of the mounting plate 44. The output end of the control motor 46 is coaxially fixedly connected to one end of the driving screw 45. The control motor 46 drives the driving screw 45 to rotate, and drives the connecting plate 48 and the movable slider 42 to move smoothly along the mounting guide rail 40 through threaded transmission. The transmission accuracy is high and the movement speed is uniform, which can realize continuous uniform speed welding of straight seams, ensuring that the weld width is consistent and the shape is beautiful.

[0053] By employing a transmission system where a control motor 46 is coupled with a precision drive screw 45, the motion control achieves high precision, fast response, and smooth, pulsation-free operation. This enables high-precision, uniform linear motion of the welding head 43. The movement speed of the welding head 43 is regulated by a synchronous control mechanism, which includes an encoder and a control unit. Through real-time feedback signals, the wire feed rate is matched with the movement speed of the welding head 43, thereby achieving uniform and stable weld seam during the welding process. The welding head 43, the wire feed rate, and the range of welding parameters can be adaptively designed according to the welding material and thickness, without being limited by specific parameters. Uniform welding ensures stable welding heat input and uniform molten pool formation, maintaining a high degree of consistency in the weld width, reinforcement height, and appearance of the straight seam weld. This effectively improves the weld appearance quality and internal quality stability, meeting the requirements for high-quality welding.

[0054] like Figure 9 As shown, the linkage structure includes a guide plate 35 fixedly connected to the upper rear side of the movable frame 14. The upper end of the guide plate 35 is provided with a guide groove 36, and the upper end of the guide groove 36 is inclined inward. The outer end of the bracket 38 is fixedly connected with a guide pin 39, and the guide pin 39 slides in cooperation with the guide groove 36. When the shaping component moves inward, the guide pin 39 is pushed downward through the guide groove 36 on the surface of the guide plate 35, thereby driving the bracket 38 and the top plate 37 to descend. When the top plate 37 moves downward, it drives the mounting rail 40 to move downward, thereby causing the welding head 43, which is mounted on the mounting rail 40 by the movable slider 42, to move downward synchronously. This achieves the effect of the shaping component and the welding head 43 moving inward at the same time. After the shaping component extrudes and shapes the cylindrical welded part, the welding head 43 moves to the upper side of the weld to weld the weld, realizing the linkage effect of "automatic pressing down when shaping is in place". Based on the different diameters of the welded parts, when welding parts with different diameters, since the welding head 43 is mounted on the mounting guide rail 40 via the sliding slider 42, when the shaping component and the mounting guide rail 40 move inward and are blocked by the welded parts, the elastic buffer rod 21 can retract to compensate for the displacement difference between the shaping component and the top plate 37. Thus, the elastic buffer rod 21 has two functions in use: it can not only buffer the downward movement of the welding head 43 driven by the mounting guide rail 40, but also retract when the shaping component and the mounting guide rail 40 move inward and are blocked by the welded parts, avoiding jamming due to obstruction by the welded parts during movement. It eliminates the need for manual or electronic adjustment of the lifting height, has a simple structure, reliable operation, and rapid response, greatly improving work efficiency, and is especially suitable for batch, high-efficiency automated welding production scenarios.

[0055] In use, the circumferential support component serves as the workpiece positioning reference. A drive device moves the two shaping components inwards synchronously to align the cylindrical workpiece laterally with the weld seam. When welding a flat workpiece, the workpiece can be directly attached to the support plate 27 using a magnetic plate 28. Then, the two shaping components are moved inwards to align the weld seam. During the movement of the shaping components, a linkage structure drives the lifting component to move downwards synchronously, causing the welding head 43 and the pressure plate 47 to automatically descend to the welding position. The pressure plate 47 pre-presses the two sides of the weld seam to eliminate misalignment and gaps. Subsequently, the drive unit moves the welding head 43 along the workpiece axis at a uniform speed to complete continuous straight seam welding. After welding, each mechanism resets sequentially, achieving integrated automatic operation of support, shaping, linkage pressing, and welding.

[0056] This invention provides two working states: cylindrical workpiece welding and flat workpiece welding. The two working states share the same drive mechanism, lifting mechanism, and welding head 43, etc. It can quickly switch according to the type of workpiece and realize multi-functional, high-precision, and highly adaptable straight seam welding operations.

[0057] When in use, it adopts a modular and variable structure design. Through the same set of power drive, mechanical linkage and welding walking system, combined with switchable support and clamping structures, it can meet the clamping and positioning, edge shaping and straight seam welding requirements of cylindrical rotating workpieces and flat planar workpieces respectively, so as to realize the compact structure and maximize the function of the equipment.

[0058] For cylindrical workpieces, a composite constraint method combining circumferential rigid support and lateral flexible shaping is adopted to ensure the roundness of the workpiece and the alignment accuracy of the weld. For flat workpieces, a planar constraint method combining angle-adjustable support and magnetic adsorption fixation is adopted to ensure the flatness of the workpiece and the straightness of the weld. This allows both types of workpieces to be welded and formed under low stress and high stability. Both working states adopt a pure mechanical linkage method of shaping action and pressing action. The precise matching of action timing is achieved by the cooperation of guide groove 36 and guide pin 39, which conforms to the design theory of high reliability, low failure rate and strong stability of mechanical systems, and ensures the continuous and consistent welding process.

[0059] During welding, a standardized welding process involving pre-pressurization, arc stabilization, and uniform speed movement is employed. Combined with structures such as the copper plate 10 thermal conductive support, the elastic buffer rod 21 buffer, and the pressure plate 47 self-adaptive pressure, the welding heat input, weld gap, and misalignment are effectively controlled, meeting the welding quality control requirements of uniform penetration, aesthetically pleasing formation, and stable joint performance.

[0060] When welding cylindrical workpieces, a radially expandable circumferential support assembly is used, which enables continuous stepless adjustment of the support diameter and quick adaptation to the inner wall support of cylindrical workpieces with different inner diameter specifications. When welding cylindrical workpieces, a rectangular thin plate is first yielded into a circle, and the internal circumferential support assembly supports the inside of the cylindrical workpiece. The shaping components on both sides move synchronously to center and shape the cylindrical joint, which can accurately center and shape the edges, effectively eliminating problems such as elliptical deformation, uneven gaps, and misaligned joints. With the mechanical linkage pressing down and the adaptive pressure plate 47, the weld is tightly fitted and the welding position is accurate. The outer end of the adjusting plate 9 is equipped with a copper plate 10 for heat conduction, which can quickly disperse the high temperature of welding and avoid thermal deformation of the support structure and the inner wall of the workpiece, significantly improving the forming quality, dimensional accuracy and equipment versatility of cylindrical straight seam welding.

[0061] During the welding of flat workpieces, the support plate 27 can swing freely around the rotation axis 33 and be adjusted according to the required welding angle of the flat workpiece, so as to achieve flexible adjustment of the welding angle and meet the requirements of various straight seam welding such as butt joint and oblique joint of flat workpieces. Then, the welding head 43 moves down and drives the lower shaping component to move inward, so that the two weld seams of the flat workpiece are aligned, and then the welding head 43 is controlled to move and weld. The brake gear 29, brake tooth plate 30 and brake spring 31 form an elastic automatic locking mechanism, which, together with the reinforcing knob 32, forms a double mechanical locking, which has strong resistance to welding vibration and stable angle positioning without drift. The upper end of the support plate 27 is equipped with a magnetic plate 28, which can quickly adsorb and fix the flat workpiece, and the clamping is efficient and convenient without mechanical indentation damage and high positioning accuracy. The working conditions can be switched without changing the core mechanism, and the flat straight seam welding can be achieved at a constant speed and stably on the same equipment, which greatly expands the applicable scenarios of the equipment, reduces the equipment investment and replacement costs, and realizes one machine for multiple uses.

[0062] This invention overcomes the shortcomings of traditional straight seam welding machines, such as limited functionality and applicability, by freely switching between two working states. It achieves compatible welding of cylindrical and flat workpieces under the premise of compact structure and reasonable cost. The two working states share the drive, linkage, lifting and welding mechanisms, resulting in high structural utilization, simple operation and low maintenance costs. At the same time, relying on rigid-flexible composite positioning and mechanical linkage control, both working conditions have the advantages of fast clamping, accurate positioning, excellent forming and stable operation, effectively improving the overall efficiency of the equipment.

[0063] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A straight seam welding machine, comprising a welding head (43), characterized in that: It also includes a bottom box (1) located on the lower side, a side plate (2) is fixedly connected to the upper rear end of the bottom box (1), a fixing frame (11) is fixedly connected to the front end of the side plate (2), a circumferential support component capable of changing diameter is installed at the front end of the fixing frame (11), and shaping components capable of moving inward are respectively provided on the left and right sides of the circumferential support component. A drive device capable of controlling the two shaping components to move inward is installed inside the bottom box (1). The upper end of the side plate (2) is equipped with a lifting assembly that can be raised and lowered. The lifting assembly and the shaping assemblies on both sides are connected by a linkage structure. When the shaping assemblies on both sides move inward under the action of the linkage structure, the lifting assembly moves downward. The welding head (43) is mounted on the lifting assembly, which is equipped with a drive unit capable of controlling the welding head (43) to reciprocate along the axial direction of the circumferential support assembly.

2. The straight seam welding machine as described in claim 1, characterized in that: The circumferential support assembly includes a horizontally arranged intermediate cylinder (3) with one end fixedly connected to the fixed frame (11). Multiple adjusting plates (9) are evenly arranged on the outer side of the intermediate cylinder (3). A bidirectional screw (5) is rotatably connected to the middle of the intermediate cylinder (3). An adjusting knob (7) is fixedly connected to the front end of the bidirectional screw (5). Moving blocks (6) are threadedly connected to both sides of the bidirectional screw (5). Hinges (8) are hinged to both sides of the inner end of the adjusting plate (9). The other end of the hinge rod (8) is hinged to the corresponding moving block (6). The surface of the intermediate cylinder (3) corresponding to the hinge rod (8) is provided with a strip-shaped opening (4) that passes through the intermediate cylinder (3) along the axial direction to accommodate the connection between the hinge rod (8) and the moving block (6).

3. A straight seam welding machine as described in claim 2, characterized in that: The outer ends of the regulating plate (9) are respectively fixedly connected to copper plates (10) for heat conduction.

4. A straight seam welding machine as described in claim 2, characterized in that: The fixed frame (11) has vertical radius scales (12) on both sides of its surface, and the two ends of the adjustment plate (9) located on the lower side are fixedly connected to pointers (13) corresponding to the radius scales (12).

5. A straight seam welding machine as described in claim 2, characterized in that: The shaping component includes a middle beam (22) and opening and closing inclined plates (23) hinged to the upper and lower sides of the middle beam (22). The outer ends of the opening and closing inclined plates (23) are inclined inward. The hinge point at which the front end of the opening and closing inclined plates (23) is hinged to the middle beam (22) is fixedly connected to a worm gear (24). A worm (25) meshes between the two worm gears (24). The worm (25) is rotatably connected to the middle beam (22). A control knob (26) is fixedly connected to one end of the worm (25).

6. A straight seam welding machine as described in claim 5, characterized in that: A rectangular opening is provided on the surface of the upper opening and closing inclined plate (23). A support plate (27) is provided inside the rectangular opening. A rotating shaft (33) is fixedly connected to the front and rear sides of the inner end of the support plate (27). The rotating shaft (33) is rotatably connected to the inner wall of the rectangular opening. A brake gear (29) is splined on the surface of the rotating shaft (33) on the front side. A brake tooth plate (30) meshes with one side of the brake gear (29). The brake tooth plate (30) is slidably connected to the surface of the opening and closing inclined plate (23). A brake spring (31) is fixedly connected to the side of the brake tooth plate (30) away from the brake gear (29). The other end of the brake spring (31) is fixedly connected to the opening and closing inclined plate (23). A reinforcing knob (32) is threadedly connected to the front side of the rotating shaft (33) on the front side.

7. A straight seam welding machine as described in claim 6, characterized in that: Multiple magnetic plates (28) are fixedly connected to the upper surface of the support plate (27).

8. A straight seam welding machine as described in claim 5, characterized in that: The driving device includes a drive motor (19) fixedly connected inside the bottom box (1) and a guide column (15) rotatably connected inside the bottom box (1). The guide column (15) has spiral grooves (20) with opposite directions of rotation on both sides of its surface. The drive motor (19) has a drive gear (18) fixedly connected to its power output end on the same axis. One end of the guide column (15) has a driven gear (17) fixedly connected to its same axis. The drive gear (18) meshes with the driven gear (17) for transmission. The outer end of the intermediate beam (22) is provided with a movable frame (14). The movable frame (14) is horizontally slidably connected to the bottom box (1). An elastic buffer rod (21) is installed between the movable frame (14) and the corresponding intermediate beam (22). The lower end of the movable frame (14) is fixedly connected with a mating pin (16). The lower end of the mating pin (16) meshes with the corresponding spiral groove (20) for transmission.

9. A straight seam welding machine as described in claim 8, characterized in that: The lifting assembly includes a top plate (37), brackets (38) are fixedly connected to both sides of the rear end of the top plate (37), and an installation guide rail (40) is installed on the lower side of the top plate (37). The installation guide rail (40) is arranged parallel to the intermediate cylinder (3). An elastic buffer rod (21) is also installed between the top plate (37) and the two ends of the installation guide rail (40). A movable slider (42) is slidably connected to the surface of the installation guide rail (40) along the length direction. An installation hole is opened in the middle of the movable slider (42). The welding head (43) is threaded to the inside of the installation hole and the welding head (43) is located on the lower side of the installation guide rail (40). The upper end of the mounting guide rail (40) is fixedly connected to a mounting plate (44), and the surface of the movable slider (42) is fixedly connected to a connecting plate (48). The connecting plate (48) and the mounting plate (44) are slidably connected along the length. The driving unit includes a driving screw (45) rotatably connected to the outer end of the mounting plate (44). The connecting plate (48) is threadedly connected to the driving screw (45). The rear end of the mounting plate (44) is fixedly connected to a control motor (46). The output end of the control motor (46) is coaxially fixedly connected to one end of the driving screw (45).

10. A straight seam welding machine as described in claim 9, characterized in that: The linkage structure includes a guide plate (35) fixedly connected to the upper rear side of the movable frame (14). The upper end of the guide plate (35) is provided with a guide groove (36) and the upper end of the guide groove (36) is inclined inward. The outer end of the bracket (38) is fixedly connected with a guide pin (39) and the guide pin (39) slides with the guide groove (36).

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