Multi-mode flexible four-corner welding machine and method for improving weld fillet strength

Abstract

The invention discloses a multi-mode flexible four-corner welding machine and method for improving the weld fillet strength, and belongs to the technical field of profile manufacturing. The welding machine comprises a machine body, a cross beam of the machine body is adjustable along an X axis, machine heads on the cross beam slide along a Y axis, and four groups of machine heads clamp four corners of a profile. The machine head integrates a pressing assembly, a heating assembly, a broaching assembly, a seam pressing assembly and the like, the pressing assembly achieves profile fixing and position adjusting through a plurality of guide rail pairs, the broaching assembly carries out precise broaching on a welding seam, and the seam pressing assembly prevents molten chips from overflowing and carries out surface molding on the profile. The method comprises the steps of debugging, charging, positioning and limiting, heating, welding seam width adjustment, welding and discharging. Welding and welding seam finishing are integrated, and the secondary machining defect is avoided; multiple groups of adjustable mechanisms and detachable accessories are matched with various profiles; the surface of the color profile can be protected, the welding quality is enhanced, and the flexible manufacturing capacity of a production line is improved.

Description

Technical Field

[0001] This invention belongs to the field of profile manufacturing technology, specifically relating to a multi-mode flexible four-corner welding machine and method for improving weld corner strength. Background Technology

[0002] With the continuous development of the real estate industry and the improvement of the level of building industrialization, doors and windows, as core components of building envelope systems, are subject to increasingly stringent requirements regarding installation efficiency and project quality. Due to their excellent thermal insulation performance, corrosion resistance, and high cost-effectiveness, PVC doors and windows have become the mainstream choice in the current building door and window industry. In particular, colored PVC profiles prepared using lamination and co-extrusion processes, with their rich appearance colors and decorative effects, have further expanded the application scenarios of PVC doors and windows, and market demand continues to grow.

[0003] However, in the production and processing of both colored and conventional PVC windows and doors, welding is a crucial process that determines the structural strength and appearance quality of the windows and doors. Currently, mainstream PVC window and door welding equipment can only perform one or a limited number of welding modes, making it difficult to adapt to diverse profile specifications and processing needs, resulting in poor equipment versatility. Specific shortcomings are concentrated in the following aspects: The welding process is cumbersome and prone to quality defects: Traditional welding processes require the welded section to be transferred to a specialized corner-cleaning machine for secondary processing. This not only increases equipment investment and floor space requirements but, more importantly, easily introduces reference deviations during secondary positioning. Furthermore, to remove residual weld seams during corner cleaning, an area 2-3mm wide needs to be cleaned, resulting in a rough and unsightly weld appearance. For colored coated or co-extruded profiles, the corner cleaning process directly damages the surface colored layer, exposing the underlying white substrate. Subsequent painting repairs are necessary, increasing costs, and the repaired paint may fade or peel after 1-2 years, severely impacting the long-term appearance of doors and windows. Additionally, unavoidable height differences during profile welding lead to poor surface smoothness after corner cleaning, further reducing processing accuracy. Summary of the Invention

[0004] To address the problems existing in the prior art, a multi-mode flexible four-corner welding machine and method for improving weld corner strength are proposed.

[0005] The technical solution to the technical problem solved by the present invention is as follows: On the one hand, a multi-mode flexible four-corner welding machine for improving weld corner strength is proposed, including a bed, on which two sets of crossbeams are slidably connected along the X-axis and the two crossbeams are arranged in parallel; at both ends of each crossbeam, machine heads are slidably connected along the Y-axis direction, and the four sets of machine heads can clamp the four corners of the profile to realize the profile welding. The machine head includes a base, on which two sets of clamping feed guide rails are arranged perpendicularly to each other. Each set of clamping feed guide rails is slidably connected to a clamping component. A heating component is arranged between the two clamping components, which can extend between the two clamping components to heat the profile clamped by the clamping components. The clamping assembly includes a clamping plate that can slide along the clamping feed guide rail pair; a clamping moving guide rail pair is connected to the clamping plate; a column is slidably connected to the clamping moving guide rail pair; the bottom of the column is connected to the lower clamping clamp; the side of the column is connected to the upper clamping guide rail pair; the upper clamping clamp can move vertically along the upper clamping guide rail pair; the upper and lower clamping clamps can press against each other to fix the profile.

[0006] Preferably, the outer side of the lower clamp is also provided with an auxiliary component, which includes an auxiliary guide rail pair vertically arranged on the clamp plate. A lower auxiliary support plate and an upper auxiliary support plate are vertically slidably connected on the auxiliary guide rail pair. A support plate spring is connected between the lower auxiliary support plate and the clamp plate. The support plate spring can lift the profile when the upper clamp is lifted, thereby separating it from the lower clamp. The upper auxiliary support plate is driven to press down onto the upper surface of the profile by an upper auxiliary clamping cylinder.

[0007] Preferably, a broaching assembly is also provided between the two clamping assemblies. The broaching assembly includes two broach guide rail pairs, which are arranged in parallel. One broach guide rail pair is slidably connected to an upper broach, and the other broach guide rail pair is slidably connected to a lower broach. The upper and lower broaches are arranged opposite to each other. Both the upper and lower broaches are driven by a broach cylinder fixed on the base to move laterally along the broach guide rail pairs, thereby broaching the upper and lower welds of the welded profile.

[0008] Preferably, the assembly also includes a seam pressing component, which comprises an upper pressure plate and a lower pressure plate. The upper and lower pressure plates can press the weld seam against each other to prevent molten metal from overflowing. A guide rod is connected to the top of the upper pressure plate, and the guide rod is slidably connected to the upper pressure plate mounting seat, which is fixed to the base. An upper pressure plate cylinder is also fixed on the upper pressure plate mounting seat. The upper pressure plate cylinder can push the upper pressure plate downward to press the weld seam at the top of the profile. A fixing plate is provided at the bottom of the lower pressure plate, and a positioning lifting pair is connected to the fixing plate. The lower pressure plate can move vertically along the positioning lifting pair. A lower pressure plate cylinder is also connected to the fixing plate, and the lower pressure plate cylinder can push the lower pressure plate upward to press the weld seam at the bottom of the profile.

[0009] Preferably, the upper pressure plate includes an upper positioning plate and an upper V-shaped pressure plate, the upper V-shaped pressure plate being detachably connected to the upper positioning plate, and the upper positioning plate being connected to the guide rod; the lower pressure plate includes a lower positioning plate and a lower V-shaped pressure plate, the lower V-shaped pressure plate being detachably connected to the lower positioning plate, and the lower positioning plate being cylinder-driven connected to the lower pressure plate.

[0010] Preferably, it also includes an outer corner pad, which can fit against the outer side wall of the profile to form an external support for the profile; the outer corner pad is detachably connected to the lower clamp.

[0011] Preferably, it also includes an inner corner clamping assembly; the inner corner clamping assembly includes a connecting plate fixed to the bottom of the upper clamp; a translation guide pair is connected to the connecting plate; a slider is slidably connected to the translation guide pair, and the slider is pushed to move laterally by a clamping cylinder fixed to the connecting plate; a pressure plate mounting block is connected to the end of the slider, and an inner corner clamping plate is detachably connected to the pressure plate mounting block.

[0012] Preferably, the slider and the pressure plate mounting block are connected by a floating spring. The floating spring is sleeved on the limiting rod. One end of the limiting rod is fixedly connected to the pressure plate mounting block, and the other end of the limiting rod can extend into the slider and slide along the slider.

[0013] Preferably, the top of the column is connected to an electric cylinder mounting plate, on which a servo electric cylinder is fixed. The servo electric cylinder is driven by an electric cylinder motor; the telescopic end of the servo electric cylinder is connected to an upper clamp.

[0014] On the other hand, a welding method using this flexible four-corner welding machine is proposed, including the following steps: S1. Debugging; Adjust the distance between the two crossbeams of the equipment to the required profile feeding width; Select the outer corner pads according to the size and cross-sectional shape of the profile and install them on the lower clamping clamps; Select the inner corner pressure plates and install them on the inner corner clamping components. S2. Loading; First, place the profile between the two crossbeams. Manually place both ends of the profile on the lower clamping clamp so that the outer side of the profile fits against the inner side of the outer corner pad. Then, place the profile between the two machine heads on a single crossbeam. Manually place the two profiles on the lower clamping clamp between the two machine heads on the crossbeam so that the outer side of the profile fits against the inner side of the outer corner pad. S3. Positioning and limiting; the upper clamp moves downward to press the profile; S4. Heating; The heating component extends between the two profiles to heat the welded ends of the profiles, while the pressing component moves in opposite directions to bring the two profiles closer to the heating component; After heating is completed, the pressing component moves in the opposite direction and the heating component retracts. S5. Adjust the weld width; drive the upper clamp to lift upwards, and the support plate spring lifts the lower auxiliary support plate upwards to separate the profile from the lower clamp; after separation, the column moves on the clamp moving guide pair to adjust the relative position of the upper and lower clamps and the profile, thereby adjusting the weld width; S6. Welding; After the upper clamping clamp presses down to tighten the profile, the two clamping components move in opposite directions to make the welding surfaces of the two profiles come together for welding; the upper and lower broaches of the broaching component reciprocate to broach the profile weld; after broaching is completed, the upper and lower pressure plates of the pressing component press the weld in opposite directions to ensure that the weld does not deform. S7. Discharge; After the welding time is reached, the seam pressing component retracts, the upper clamp moves up to loosen the profile, and the two crossbeams move in opposite directions; the pusher cylinder drives the pusher plate to push the profile out of the pressing component, and the profile falls onto the feeding belt, which then transports the welded profile out of the welding machine.

[0015] Compared with existing technologies, the above technical solution has the following advantages or beneficial effects: 1. This invention integrates heating components, clamping components, and other mechanisms in the machine head, achieving integrated processing of welding and weld finishing. After welding, there is no need for secondary processing by transportation, which reduces equipment investment and production floor space, while also avoiding flatness defects caused by reference deviations during secondary positioning.

[0016] 2. The upper and lower broaches of the broaching assembly of this invention can precisely broach the weld directly after welding, and the broaching width can be precisely controlled, making the weld surface smooth and beautiful. For colored coated or co-extruded profiles, precise broaching can effectively protect the surface colored layer, completely eliminating the need for corner cleaning and subsequent painting repair. This not only reduces labor and material costs, but also avoids the problem of paint fading during repairs, ensuring the long-term consistent appearance of doors and windows.

[0017] 3. The upper and lower pressure plates of the seam pressing assembly of this invention precisely press the weld seam after broaching, effectively preventing molten material from overflowing and enhancing the weld seam density to meet the structural strength requirements of mid-to-high-end doors and windows. Furthermore, the broaching assembly uses a cylinder-driven flexible broaching method, which reduces the wear rate compared to rigid shear blades, effectively improving production continuity.

[0018] 4. The bed beam of this invention is adjustable along the X-axis, and the machine head slides along the Y-axis of the beam. Combined with multiple adjustable mechanisms such as the clamping jaw moving guide rail pair and the upper clamping jaw guide rail pair in the clamping assembly, it can quickly adapt to profiles of different lengths, widths, and cross-sectional dimensions. The outer corner pads and inner corner pressure plates are detachable, allowing for quick replacement of accessories of corresponding specifications according to the profile cross-sectional shape without modifying the main structure of the equipment. The floating structure composed of a floating spring and a limiting rod in the inner corner clamping assembly can adapt to minor deformations during the profile welding process, ensuring uniform transmission of clamping force, avoiding damage to the profile, and improving the flexible manufacturing capability of the production line.

[0019] 5. This invention constructs a semi-automated processing flow from loading and positioning, heating and welding, broaching and finishing to unloading and conveying by using a servo-electric cylinder-driven upper clamp, a cylinder-controlled auxiliary support plate, and a pushing assembly. The support plate spring of the auxiliary assembly automatically lifts the profile during the weld width adjustment stage, achieving damage-free separation from the lower clamp. Combined with the precise movement of the column, this makes weld width adjustment more convenient and efficient. The clamping cylinder of the inner corner clamping assembly works in conjunction with the translation guide pair to achieve automatic clamping and positioning of the inner corners, reducing manual intervention. Throughout the entire process, the operator only needs to complete the loading and parameter setting; the equipment can automatically complete subsequent processes, effectively improving the standardization level and production efficiency of the production line. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0021] Figure 1 This is an isometric side view of a flexible four-corner welding machine.

[0022] Figure 2 This is an isometric side view of the machine head.

[0023] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0024] Figure 4 yes Figure 2 Enlarged view of section B in the middle.

[0025] Figure 5 This is an isometric side view of the clamping assembly.

[0026] Figure 6 This is an isometric side view of the pressure plate portion of the seam sealing assembly.

[0027] Figure 7 This is an isometric side view of the lower pressure plate portion of the seam sealing assembly.

[0028] Figure 8 This is an isometric side view of the inner corner clamping component.

[0029] Explanation of reference numerals in the attached figures: 1. Electrical control box; 2. Operating table; 3. Machine head; 4. Crossbeam; 5. Bed; 6. X-axis drive motor; 7. Horizontal slide rail pair; 8. Heating assembly; 9. Seaming assembly; 10. Base plate; 11. Pressing tool feed guide rail pair; 12. Pressing plate; 13. Lower pull cutter; 14. Support plate spring; 15. Lower pressing clamp; 16. Extrusion cutter; 17. Lower auxiliary support plate; 18. Profile; 19. Outer corner pad; 20. Upper pressing clamp guide rail pair; 21. Upper pull cutter; 22. Auxiliary assembly; 23. Pull cutter guide rail pair; 24. Pull cutter cylinder; 25. Upper auxiliary clamping cylinder; 26. Column; 27. Electric cylinder mounting plate; 28. Electric cylinder motor; 29. ​​Servo electric cylinder; 30. Auxiliary guide rail pair; 31. Upper auxiliary support plate; 32. Pushing cylinder; 33. Pressing tool feed servo motor 34. Feed motor mounting plate; 35. Feed screw pair; 36. Clamp moving guide rail pair; 37. Clamp moving servo screw motor; 38. Screw motor base; 39. Main support plate; 40. Upper clamp; 41. Upper clamp cylinder; 42. Guide rod; 43. Linear bearing pair; 44. Upper clamp mounting base; 45. Upper positioning plate; 46. Upper V-shaped clamp; 47. Lower V-shaped clamp; 48. Lower positioning plate; 49. Lower clamp cylinder; 50. Positioning lifting pair; 51. Fixing plate; 52. X-axis drive belt; 53. Inner corner clamping assembly; 54. Clamping cylinder; 55. Connecting plate; 56. T-nut; 57. Slider; 58. Translation guide rail pair; 59. Floating spring; 60. Limit rod; 61. Clamp mounting block; 62. Inner corner clamp. Detailed Implementation

[0030] To clearly illustrate the technical features of this solution, the invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. The following disclosure provides many different embodiments or examples for implementing different structures of the invention. To simplify the disclosure of the invention, components and arrangements of specific examples are described below. Furthermore, reference numerals and / or letters may be repeated in different examples. This repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. It should be noted that the components illustrated in the drawings are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted to avoid unnecessarily limiting the invention. Terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] Example 1: Please see Figures 1-8 This embodiment proposes a multi-mode flexible four-corner welding machine to improve weld corner strength, including a bed 5, an operating table 2 for controlling the welding machine and an electrical control box 1 on one side of the bed 5; two sets of crossbeams 4 are slidably connected on the bed 5 along the X-axis, and the two crossbeams 4 are arranged in parallel; each crossbeam 4 has a machine head 3 slidably connected to both ends along the Y-axis, and the four sets of machine heads 3 can clamp the four corners of the profile 18 to realize the welding of the profile 18; The machine head 3 includes a base, on which two sets of clamping feed guide rail pairs 11 are arranged perpendicularly to each other. Each set of clamping feed guide rail pairs 11 is slidably connected to a clamping component. A heating component 8 is arranged between the two clamping components. The heating component 8 includes a heating plate, which is pushed by a cylinder. The heating component 8 can extend between the two clamping components to heat the profile 18 clamped by the clamping components. The clamping assembly includes a clamping plate 12, which can slide along the clamping feed guide rail 11; a clamping moving guide rail 36 is connected to the clamping plate 12; a column 26 is slidably connected to the clamping moving guide rail 36; a lower clamping clamp 15 is connected to the bottom of the column 26; an upper clamping guide rail 20 is connected to the side of the column 26; the upper clamping clamp 40 can move vertically along the upper clamping guide rail 20; the upper clamping clamp 40 and the lower clamping clamp 15 can clamp the profile 18 in opposite directions to fix the profile 18; in addition, extrusion blades 16 are provided on both the upper clamping clamp 40 and the lower clamping clamp 15, which can flatten the upper and lower surfaces of the profile 18 to ensure flatness.

[0032] Example 2: Continue reading Figures 1-8 Based on Example 1, this example mainly introduces how each part is driven. The driving method is not unique, and the following is the preferred method.

[0033] First, regarding how the crossbeam 4 moves: At least two sets of transverse slide rail pairs 7 are provided on the bed 5 along the X-axis direction. One crossbeam 4 can slide along the transverse slide rail pair 7, while the other crossbeam 4 is fixed to the bed. The transverse slide rail pair 7 provides guidance for the movement of the crossbeam 4. In addition, an X-axis drive belt 52 is provided on the inner side of the transverse slide rail pair 7, and the bottom of one crossbeam 4 is fixed to the belt. The X-axis drive belt 52 is driven to rotate by an X-axis drive motor 6 fixed on the bed 5. When the X-axis drive motor 6 is working, it drives the X-axis drive belt 52 to rotate, thereby driving one crossbeam 4 to move towards the other crossbeam 4, realizing opposite movement.

[0034] Secondly, regarding the movement of the clamping components on the machine head 3: the working feed motor mounting plate 34 is fixedly connected to the base plate 10, the working feed motor mounting plate 34 is fixedly connected to the clamping feed servo motor 33, the output end of the clamping feed servo motor 33 is connected to the working feed screw pair 35, the moving block on the working feed screw pair 35 is connected to the clamping plate 12 to drive the clamping components above to move, and the clamping components are moved by the clamping feed servo motor 33 to achieve the opposite movement of the two clamping components.

[0035] Secondly, regarding the left and right movement of the upper clamp 40 and the lower clamp 15: the left and right movement of the upper clamp 40 and the lower clamp 15 allows for the flattening process of the upper and lower surfaces of the profile 18 via the extrusion blade 16 mounted on them, and also allows for adjustment of the clamping position on the profile 18, improving production efficiency. A clamp moving guide rail pair 36 is connected to the clamp plate 12, and a lead screw motor base 38 is also connected to the clamp plate 12. A clamp moving servo lead screw motor 37 is fixedly connected to the lead screw base 38, and is connected to the column 26 through the lead screw; the clamp moving servo lead screw motor 37 drives the lead screw to rotate, which in turn drives the column 26 and the upper clamp 40 and the lower clamp 15 on it to move left and right.

[0036] By using servo CNC axis control for both the working feed and vertical clamping of the left and right clamping components, the left and right clamping components of one machine head 3 can be fed simultaneously. The feed speed can be controlled by servo CNC, realizing co-extrusion welding, avoiding the influence of cylinder pressure fluctuations on welding time and strength, ensuring the consistency of welding patterns, and improving the angle strength of the weld.

[0037] Finally, regarding the vertical movement of the upper clamp 40: an electric cylinder mounting plate 27 is connected to the top of the column 26, and a servo electric cylinder 29 is fixed on the electric cylinder mounting plate 27. The servo electric cylinder 29 is driven by the electric cylinder motor 28. The telescopic end of the servo electric cylinder 29 is connected to the upper clamp 40, and the servo electric cylinder 29 pushes the upper clamp 40 to move vertically.

[0038] Example 3: Continue reading Figures 1-8 Based on the above embodiments, this embodiment finds that an auxiliary component 22 is also provided on the outside of the lower clamp 15. The auxiliary component 22 includes an auxiliary guide rail pair 30 vertically arranged on the clamp plate 12. A lower auxiliary support plate 17 and an upper auxiliary support plate 31 are vertically slidably connected on the auxiliary guide rail pair 30. A support plate spring 14 is connected between the lower auxiliary support plate 17 and the clamp plate 12. The support plate spring 14 can lift the profile 18 when the upper clamp 40 is lifted, thereby separating it from the lower clamp 15. The upper auxiliary support plate 31 is driven to press down onto the upper surface of the profile 18 by the upper auxiliary clamping cylinder 25.

[0039] Example 4: Continue reading Figures 1-8 In this embodiment, a broaching assembly is also provided between the two clamping assemblies. The broaching assembly includes two broach guide rail pairs 23, which are arranged in parallel. One broach guide rail pair 23 is slidably connected to an upper broach 21, and the other broach guide rail pair 23 is slidably connected to a lower broach 13. The upper broach 21 and the lower broach 13 are arranged opposite to each other. Both the upper broach 21 and the lower broach 13 are driven to move laterally along the broach guide rail pair 23 by a broach cylinder 24 fixed on the base, so as to broach the upper and lower welds of the welded profile 18.

[0040] Example 5: Continue reading Figures 1-8In this embodiment, a seam pressing assembly 9 is also included. The seam pressing assembly 9 includes an upper pressure plate and a lower pressure plate. The upper pressure plate and the lower pressure plate can press the weld seam against each other to prevent molten metal from overflowing. A guide rod 42 is connected to the top of the upper pressure plate. The guide rod 42 is slidably connected to the linear bearing pair 43 of the upper pressure plate mounting seat 44. The upper pressure plate mounting seat 44 is fixed on the base. An upper pressure plate cylinder 41 is also fixed on the upper pressure plate mounting seat 44. The upper pressure plate cylinder 41 can push the upper pressure plate down to press the weld seam on the upper part of the profile 18. A fixing plate 51 is provided at the bottom of the lower pressure plate. A positioning lifting pair 50 is connected to the fixing plate 51. The lower pressure plate can move vertically along the positioning lifting pair 50. A lower pressure plate cylinder 49 is also connected to the fixing plate 51. The lower pressure plate cylinder 49 can push the lower pressure plate up to press the weld seam at the bottom of the profile 18.

[0041] The upper pressure plate includes an upper positioning plate 45 and an upper V-shaped pressure plate 46. The upper V-shaped pressure plate 46 is detachably connected to the upper positioning plate 45, and the upper positioning plate 45 is connected to the guide rod 42. The lower pressure plate includes a lower positioning plate 48 and a lower V-shaped pressure plate 47. The lower V-shaped pressure plate 47 is detachably connected to the lower positioning plate 48, and the lower positioning plate 48 is driven by the lower pressure plate cylinder 49.

[0042] Example 6: Continue reading Figures 1-8 This embodiment also includes an outer corner pad 19 and an inner pressure holding assembly. The outer corner pad 19 can fit against the outer side wall of the profile 18 to form an outer support for the profile 18. The outer corner pad 19 is detachably connected to the lower clamp 15. In this embodiment, the outer corner pad 19 is inserted into the main support plate 39, and the outer corner pad 19 can be replaced according to the different outer surfaces of the profile 18.

[0043] The inner corner clamping assembly 53 includes a connecting plate 55 fixed to the bottom of the upper clamp 40; a translation guide pair 58 is connected to the connecting plate 55; a slider 57 is slidably connected to the translation guide pair 58, and the slider 57 is pushed to move laterally by a clamping cylinder 54 fixed to the connecting plate 55; a pressure plate mounting block 61 is connected to the end of the slider 57, and an inner corner clamping plate 62 is detachably connected to the pressure plate mounting block 61.

[0044] The slider 57 is connected to the pressure plate mounting block 61 by a floating spring 59. The floating spring 59 is sleeved on the limiting rod 60. One end of the limiting rod 60 is fixedly connected to the pressure plate mounting block 61, and the other end of the limiting rod 60 can extend into the slider 57 and slide along the slider 57.

[0045] The entire assembly can be fixed in the T-slot of the upper clamping clamp 40 by adjusting the T-nut 56 via the pressure plate. It can be adjusted back and forth according to the width of different profiles 18. The inner corner pressure plate 62 needs to be replaced according to the different inner corner cross-sections of the profile 18. It is connected to the pressure plate mounting block 61 through the T-slot for easy replacement.

[0046] Furthermore, based on the above embodiments, a welding method using this flexible four-corner welding machine is proposed, comprising the following steps: S1. Debugging; Adjust the distance between the two crossbeams 4 of the equipment to the required material feeding width of the profile 18; Select the outer corner pad 19 according to the size and cross-sectional shape of the profile 18 and install it on the lower clamp 15; Select the inner corner clamp 62 and install it on the inner corner clamping assembly 53. S2. Loading; First, place the profile 18 between the two crossbeams 4. Manually place both ends of the profile 18 onto the lower clamp 15 so that the outer side of the profile 18 fits against the inner side of the outer corner pad 19; then place the profile 18 between the two machine heads 3 on a single crossbeam 4. Manually place the two profiles 18 on the lower clamp 15 between the two machine heads 3 on the crossbeam 4 so that the outer side of the profile 18 fits against the inner side of the outer corner pad 19. S3. Positioning and limiting; the upper clamp 40 moves downward to press and tighten the profile 18; S4. Heating; The heating component 8 extends between the two profiles 18 to heat the welding ends of the profiles 18, while the pressing component moves in opposite directions to bring the two profiles 18 closer to the heating component 8; After heating is completed, the pressing component moves in the opposite direction and the heating component 8 retracts. S5. Adjust the weld width; drive the upper clamp 40 to lift upwards, and the support plate spring 14 to lift the lower auxiliary support plate 17 upwards, so as to separate the profile 18 from the lower clamp 15; after separation, the column 26 moves on the clamp moving guide rail pair 36 to adjust the relative position of the upper clamp 40 and the lower clamp 15 with the profile 18, so as to adjust the weld width. S6. Welding; After the upper clamping clamp 40 presses down to clamp the profile 18, the two clamping components move in opposite directions to make the welding surfaces of the two profiles 18 come together for welding; the upper broach 21 and the lower broach 13 of the broaching component reciprocate to broach the weld of the profile 18; after broaching is completed, the upper pressure plate and the lower pressure plate of the pressing component 9 press the weld in opposite directions to ensure that the weld does not deform; S7. Discharge; After the welding time is reached, the seam pressing assembly 9 retracts, the upper clamp 40 moves up to release the profile 18, and the two crossbeams 4 move in opposite directions; a pusher cylinder 32 is also provided between the upper clamp 40 and the lower clamp 15 of one of the pressing assemblies. The pusher cylinder 32 drives the pusher plate to push the profile 18 out of the pressing assembly, and the profile 18 falls onto the feeding belt. The feeding belt transports the welded profile 18 out of the welding machine.

[0047] Although the specific embodiments of the invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the invention. Based on the technical solutions of the invention, various modifications or variations that can be made by those skilled in the art without creative effort are still within the scope of protection of the invention.

Claims

1. A multi-mode flexible four-corner welding machine for improving weld strength, comprising a bed (5), two sets of crossbeams (4) slidably connected along the X-axis on the bed (5), the two crossbeams (4) being arranged in parallel; each crossbeam (4) having a head (3) slidably connected to both ends along the Y-axis, the four heads (3) being able to clamp the four corners of a profile (18) to achieve welding of the profile (18); characterized in that: The machine head (3) includes a base, on which two sets of clamping tool guide rail pairs (11) are arranged perpendicularly to each other. Each set of clamping tool guide rail pairs (11) is slidably connected to a clamping component. A heating component (8) is arranged between the two clamping components. The heating component (8) can extend between the two clamping components to heat the profile (18) clamped by the clamping components. The clamping assembly includes a clamping plate (12), which can slide along the clamping feed guide (11); the clamping plate (12) is connected to the clamping moving guide (36); the clamping moving guide (36) is slidably connected to the column (26), the bottom of the column (26) is connected to the lower clamp (15), the side of the column (26) is connected to the upper clamping guide (20), the upper clamp (40) can move vertically along the upper clamping guide (20), and the upper clamp (40) and the lower clamp (15) can press the profile (18) against each other to fix the profile (18).

2. The multi-mode flexible four-corner welding machine for improving weld strength according to claim 1, characterized in that: An auxiliary component (22) is also provided on the outside of the lower clamp (15). The auxiliary component (22) includes an auxiliary guide rail pair (30) vertically arranged on the clamp plate (12). A lower auxiliary support plate (17) and an upper auxiliary support plate (31) are vertically slidably connected on the auxiliary guide rail pair (30). A support plate spring (14) is connected between the lower auxiliary support plate (17) and the clamp plate (12). The support plate spring (14) can lift the profile (18) when the upper clamp (40) is lifted, thereby separating it from the lower clamp (15). The upper auxiliary support plate (31) is driven to press down onto the upper surface of the profile (18) by the upper auxiliary clamping cylinder (25).

3. The multi-mode flexible four-corner welding machine for improving weld strength according to claim 1, characterized in that: A broaching assembly is also provided between the two clamping assemblies. The broaching assembly includes two broach guide rail pairs (23). The two broach guide rail pairs (23) are arranged in parallel. One broach guide rail pair (23) is slidably connected to an upper broach (21), and the other broach guide rail pair (23) is slidably connected to a lower broach (13). The upper broach (21) and the lower broach (13) are arranged opposite to each other. The upper broach (21) and the lower broach (13) are both driven by a broach cylinder (24) fixed on the base to move laterally along the broach guide rail pair (23) to realize the broaching of the upper and lower welds of the welded profile (18).

4. A multi-mode flexible four-corner welding machine for improving weld strength according to claim 3, characterized in that: It also includes a seam pressing assembly (9), which includes an upper pressure plate and a lower pressure plate. The upper and lower pressure plates can press the weld seam against each other to prevent molten metal from overflowing. A guide rod (42) is connected to the top of the upper pressure plate. The guide rod (42) is slidably connected to the upper pressure plate mounting seat (44), which is fixed to the base. An upper pressure plate cylinder (41) is also fixed on the upper pressure plate mounting seat (44). The upper pressure plate cylinder (41) can push the upper pressure plate down to press the weld seam at the top of the profile (18). A fixing plate (51) is provided at the bottom of the lower pressure plate. A positioning lifting pair (50) is connected to the fixing plate (51), and the lower pressure plate can move vertically along the positioning lifting pair (50). A lower pressure plate cylinder (49) is also connected to the fixing plate (51), and the lower pressure plate cylinder (49) can push the lower pressure plate up to press the weld seam at the bottom of the profile (18).

5. A multi-mode flexible four-corner welding machine for improving weld strength according to claim 4, characterized in that: The upper pressure plate includes an upper positioning plate (45) and an upper V-shaped pressure plate (46). The upper V-shaped pressure plate (46) is detachably connected to the upper positioning plate (45), and the upper positioning plate (45) is connected to the guide rod (42). The lower pressure plate includes a lower positioning plate (48) and a lower V-shaped pressure plate (47). The lower V-shaped pressure plate (47) is detachably connected to the lower positioning plate (48), and the lower positioning plate (48) is driven by the lower pressure plate cylinder (49).

6. The multi-mode flexible four-corner welding machine for improving weld strength according to claim 1, characterized in that: It also includes an outer corner pad (19), which can fit against the outer side wall of the profile (18) to form an outer support for the profile (18); the outer corner pad (19) is detachably connected to the lower clamp (15).

7. A multi-mode flexible four-corner welding machine for improving weld strength according to claim 6, characterized in that: It also includes an inner corner clamping assembly (53); the inner corner clamping assembly (53) includes a connecting plate (55) fixed to the bottom of the upper clamp (40); a translation guide pair (58) is connected to the connecting plate (55); a slider (57) is slidably connected to the translation guide pair (58), and the slider (57) is pushed to move laterally by a clamping cylinder (54) fixed to the connecting plate (55); the end of the slider (57) is connected to a pressure plate mounting block (61), and an inner corner pressure plate (62) is detachably connected to the pressure plate mounting block (61).

8. A multi-mode flexible four-corner welding machine for improving weld strength according to claim 7, characterized in that: The slider (57) and the pressure plate mounting block (61) are connected by a floating spring (59). The floating spring (59) is sleeved on the limiting rod (60). One end of the limiting rod (60) is fixedly connected to the pressure plate mounting block (61), and the other end of the limiting rod (60) can extend into the slider (57) and slide along the slider (57).

9. A multi-mode flexible four-corner welding machine for improving weld strength according to claim 1, characterized in that: The top of the column (26) is connected to the electric cylinder mounting plate (27), and a servo electric cylinder (29) is fixed on the electric cylinder mounting plate (27). The servo electric cylinder (29) is driven by the electric cylinder motor (28). The telescopic end of the servo electric cylinder (29) is connected to the upper clamp (40).

10. A welding method using the flexible four-corner welding machine according to any one of claims 1-9, characterized in that, Includes the following steps: S1. Debugging; Adjust the distance between the two crossbeams (4) of the equipment to the required material feeding width of the profile (18); Select the outer corner pad (19) according to the size and cross-sectional shape of the profile (18) and install it on the lower clamp (15); Select the inner corner pressure plate (62) and install it on the inner corner clamping assembly (53); S2. Loading; First, place the profile (18) between the two crossbeams (4), and manually place both ends of the profile (18) on the lower clamp (15) so that the outer side of the profile (18) fits against the inner side of the outer corner pad (19); then place the profile (18) between the two machine heads (3) on a single crossbeam (4), and manually place the two profiles (18) on the lower clamp (15) between the two machine heads (3) on the crossbeam (4) so ​​that the outer side of the profile (18) fits against the inner side of the outer corner pad (19); S3. Positioning and limiting; the upper clamp (40) moves down to press the profile (18); S4. Heating; The heating component (8) extends between the two profiles (18) to heat the welding end of the profiles (18), while the pressing component moves in opposite directions to bring the two profiles (18) closer to the heating component (8); After heating is completed, the pressing component moves in the opposite direction and the heating component (8) retracts; S5. Adjust the weld width; drive the upper clamp (40) to lift upwards, and the support plate spring (14) lifts the lower auxiliary support plate (17) upwards to separate the profile (18) from the lower clamp (15); after separation, the column (26) moves on the clamp moving guide pair (36) to adjust the relative position of the upper clamp (40) and the lower clamp (15) with the profile (18) to adjust the weld width; S6. Welding; After the upper clamp (40) presses down and clamps the profile (18), the two clamping components move in opposite directions to make the welding surfaces of the two profiles (18) come together for welding; the upper broach (21) and lower broach (13) of the broaching component reciprocate to broach the weld of the profile (18); after broaching is completed, the upper pressure plate and lower pressure plate of the pressing component (9) press the weld in opposite directions to ensure that the weld does not deform; S7. Discharge; After the welding time is reached, the seam pressing assembly (9) retracts, the upper clamp (40) moves up to loosen the profile (18), and the two crossbeams (4) move in opposite directions; the pusher cylinder (32) drives the pusher plate to push the profile (18) out of the pressing assembly, the profile (18) falls onto the feeding belt, and the feeding belt transports the welded profile (18) out of the welding machine.

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