Metal frame splicing and welding device and splicing and welding method

Abstract

The present application relates to the technical fields of metal frame splicing and welding, and discloses a metal frame splicing and welding device and method, which comprises a rack, a I-shaped bearing plate for welding bearing is installed in the rack, two symmetrical carriages are slidably installed between the rack and the I-shaped bearing plate through guide rails, and two ball screw linear modules for transverse movement of the carriages are installed on the inner wall of the top of the rack. The present application can internally support the corner of the joint of the side frame and the U-shaped frame by the upper and lower right-angle supporting plates of the setting traveling inner supporting part, and externally clamp the corner by the corner pressing part, so as to form rigid support in the heat affected zone, significantly inhibit the deformation caused by high temperature, ensure the welding precision, greatly improve the production efficiency, realize the automatic intelligent manufacturing from placing the workpiece, then positioning, clamping, welding, deformation prevention to finished product taking out, and significantly improve the welding precision, quality stability and operation safety.

Description

Technical Field

[0001] This invention relates to the field of metal frame welding technology, specifically to a metal frame welding equipment and welding method. Background Technology

[0002] In the manufacturing process of metal structural components, frame components are widely used in mechanical equipment, building formwork, logistics equipment and automation equipment due to their high structural strength and good load-bearing capacity. Taking a rectangular metal frame as an example, it is usually made by splicing a U-shaped frame and two side frames and welding them together using plasma arc welding. Before plasma arc welding, each component needs to be precisely positioned and clamped to ensure the quality of the weld and the overall dimensional accuracy.

[0003] Plasma arc welding, a high-energy-density welding method that uses a plasma arc as a heat source, is based on the principle of using the compressed arc generated between the tungsten electrode inside the plasma welding torch and the workpiece to form a plasma arc with extremely high temperature and concentrated energy, thereby achieving the melting and joining of metal materials. This process has advantages such as high energy density, narrow heat-affected zone, fast welding speed, and beautiful weld formation, and is especially suitable for welding medium and thin plate structural parts that are sensitive to heat deformation.

[0004] During the welding process of metal frames, especially at the short gaps between the joints, the temperature in the welding area rises sharply, which can easily cause thermal deformation of the unwelded parts. Particularly at the inner corner where the two parts fit together, the structural rigidity is relatively weak, and without effective support, it is very easy to warp or shrink due to thermal stress, which will affect the subsequent assembly accuracy. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a metal frame welding equipment and welding method, mainly to solve the problem that due to the relatively weak structural rigidity, the frame is prone to warping or shrinkage deformation under thermal stress without effective support, which in turn affects the subsequent assembly accuracy.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A metal frame welding equipment includes a frame, an I-shaped support plate for welding is installed inside the frame, two symmetrical carriages are slidably installed between the frame and the I-shaped support plate via guide rails, two ball screw linear modules for lateral movement of the carriages are installed on the inner wall of the top of the frame, and two inner clamping parts and one outer clamping part are installed in each carriage, the inner clamping parts and the outer clamping parts are used to clamp the side frame on both sides; The two inner clamping components include thickened square tubes, with right-angle frames installed inside the thickened square tubes, and inner support frames installed at the free ends of the right-angle frames; Each of the two inner support frames on each carriage is provided with a traveling inner support member on one side. The traveling inner support member is used to support the inner corner of the joint between the side frame and the U-shaped frame. Both inner walls of the carriage are provided with external pressing members that cooperate with the corresponding traveling inner support members. The external pressing members are used to press the edge of the U-shaped frame. The metal frame welding equipment also includes a lifting platform, a four-sided limiting component for limiting the U-shaped frame, and a welding component for welding. A stepped square opening is provided in the middle of the I-shaped support plate; The lifting platform includes a bottom support fixedly connected to the lower surface of the I-shaped support plate, and multiple electric telescopic rods fixedly connected to the center of the upper surface of the bottom support. The piston rod ends of the multiple electric telescopic rods are fixedly connected to a stepped square plate, and multiple telescopic rods are fixedly connected to the four corners of the lower surface of the stepped square plate at corresponding positions between the bottom support and the base. The stepped square plate and the stepped square opening fit together; The four-sided limiting component includes two rows of blocks fixedly connected to the upper surface of the stepped square plate. The blocks are used to limit the two bottom edges of the U-shaped frame. The welding assembly includes two robotic arms fixedly connected to the upper surface of the bottom support.

[0007] Furthermore, the accompanying inner support includes a cylinder two fixedly connected to one side of the inner support frame. The piston rod end of the cylinder two is fixedly connected to a connecting seat. Two mounting cavities are opened on one side of the connecting seat, and the two mounting cavities are a top opening and a bottom opening, respectively. Both of the mounting cavities are fixedly connected to electric push rods facing opposite directions, and the telescopic ends of the electric push rods are fixedly connected to follower internal supports.

[0008] Based on the aforementioned scheme, two square rods are fixedly connected to the top and bottom of the connecting seat, and the two square rods are distributed in an L-shape. Right-angle support plates are fixedly connected to the free ends of the two square rods at the same end, and the distance between the opposite sides of the two right-angle support plates is equal to the inner width of the side frame. Both sides of the follow-up inner support are provided with clearance grooves to avoid the opposite rod.

[0009] As a further embodiment of the present invention, the upper surface of the right-angle support plate located at the top is provided with a corner clamping member, which cooperates with the right-angle support plate to clamp the corner where the U-shaped frame connects to the side frame. The corner clamping component includes a corner cylinder fixedly connected to the upper surface of the top right-angle support plate. The rotating output end of the corner cylinder is detachably mounted with a pressure rod by bolts. The corner cylinder and the pressure rod cooperate to perform the clamping action.

[0010] Furthermore, the external pressing component includes a curved plate fixedly connected to the inner walls of both sides of the slide, a cylinder three fixedly connected to one side of the curved plate, an end plate fixedly connected to the piston end of the cylinder three, and an external pressure plate fixedly connected to one side of the end plate.

[0011] As a further embodiment of the present invention, two sliding openings are provided on the upper surface of the stepped square plate near the other two sides. A U-shaped stop bar is slidably installed in the two sliding openings on the same side. The U-shaped stop bar is used to limit the two sides of the U-shaped frame. Two cylinders are fixedly connected to the lower surface of the stepped square plate for pushing and pulling the U-shaped stop bar to slide up and down along the sliding opening. A limiting groove is provided at the top of the sliding opening, and a plate that cooperates with the limiting groove is fixedly connected to one side of each end of the U-shaped stop bar. The thickness of the panel is equal to the thickness of the U-shaped frame, and the depth of the limiting groove is half the thickness of the panel.

[0012] Furthermore, the external clamping component includes multiple L-shaped plates fixedly connected to the inner wall of the bottom of the slide, and a set of light rods fixedly connected to one side of each L-shaped plate. An external pressure frame is threaded through the multiple sets of light rods and slidably connected to them via a sliding sleeve. A cylinder is fixedly connected at the center of the inner wall of the bottom of the slide to move the external pressure frame laterally along the light rods. A cross strut is fixedly connected between the two inner support frames. The distance between the top and bottom of the cross strut is equal to the width of the inner side of the side frame. The two inner support frames, the cross strut, and the accompanying inner support components cooperate to form a support part that fits into the inner side of the side frame.

[0013] Based on the aforementioned scheme, a plasma arc welding torch is fixedly connected to the end of the robotic arm, and the robotic arm is used to drive the plasma arc welding torch to move along a predetermined trajectory.

[0014] A method for welding metal frames includes the following steps: Step 1: U-shaped frame installation and pre-positioning. Place the U-shaped frame on the I-shaped support plate. Use the four-sided limiting components driven by the lifting platform to initially position the U-shaped frame, centering it and restricting its horizontal movement. For side frame loading and installation, the two side frames are respectively fastened to one side of the inner clamping member, abutting against the inner wall of the side frame from the inside, and the outer clamping member presses against the outer wall of the side frame from the outside, thus completing the double-sided clamping and fixing of the side frame. Step 2: Start the two ball screw linear modules to drive the two carriages to move laterally along the guide rail towards the U-shaped frame until the side frame held by the inner and outer clamping parts on the carriages reaches the required welding position. The accompanying inner support parts support the inner edge and corner of the side frame. Then, the outer pressing parts apply pressure from the edge of the U-shaped frame. The outer pressing parts and the accompanying inner support parts cooperate to complete the double-sided extrusion. Step 3: Welding. The welding components are welded to the joints between the U-shaped frame and the two side frames along a predetermined trajectory. During the welding process, the accompanying inner support can move synchronously with the welding position, continuously providing support for the inner corner; Step 4: Unloading. After welding is completed, the welding assembly is retracted, and the external pressing parts, accompanying inner support parts, and external clamping parts are released in sequence. The ball screw linear module is started to drive the slide to move inward, so that the inner clamping parts are disengaged from the side frame. Next, the welded metal frame body is lowered by the lifting platform, and finally the metal frame is removed from the I-shaped support plate. After removal, the slide is reset by the ball screw linear module, and the lifting platform is moved up to reset.

[0015] Compared with the prior art, the present invention provides a metal frame welding device and welding method, which has the following beneficial effects: 1. The present invention uses an accompanying inner support member, with right-angle support plates distributed vertically to support the corner where the side frame and the U-shaped frame meet from the inside, and with the corner clamping member clamping from the outside, to form a rigid support in the heat-affected zone, which significantly suppresses deformation caused by high temperature and ensures the accuracy of welding.

[0016] 2. This invention achieves bidirectional clamping during the welding process by setting external pressing members on both sides of the carriage to cooperate with the accompanying inner support members. When the accompanying inner support members support from the inside, the outer pressure plate presses the U-shaped frame from the outer edge, providing a reverse constraint force for the welding area. This effectively avoids warping deformation to the outside caused by unidirectional force during the welding process and ensures the flatness of the weld.

[0017] 3. This invention uses a lifting platform embedded in an I-shaped support plate and multiple sections of electric telescopic rods to drive the stepped square plate to rise and fall along the stepped square opening. After welding is completed, the lifting platform drives the metal frame body to automatically descend and detach from the support plane, providing ample operating space for picking up parts and significantly improving the convenience of operation.

[0018] 4. The present invention uses a four-sided limiting component formed by combining a stop block and a liftable U-shaped stop bar to limit the bottom and side edges of the U-shaped frame in all directions. In addition, the U-shaped stop bar, in conjunction with the insert plate and the limiting groove, not only effectively constrains the U-shaped frame and prevents welding displacement, but also avoids interference with the feeding process of the side frame due to the limiting structure being too high.

[0019] 5. The L-shaped square rod and right-angle support plate in the accompanying inner support of the present invention can support the inner corner of the side frame from both the top and bottom ends at the same time. This not only provides a large support area, but also avoids motion interference through the design of the avoidance groove, so that the support component can flexibly extend or retract according to the welding process.

[0020] 6. This invention integrates inner and outer clamping components on the carriage, using an inner support frame to support from the inside and an outer pressure frame to press from the outside, achieving double-sided clamping of the side frame. In addition, with the cross strut and accompanying inner support component, a support part that fits with the inner side of the side frame is formed, ensuring the accuracy of the side frame's positioning before welding and the stability of its posture during welding, laying a solid foundation for welding accuracy. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the front three-dimensional structure of a metal frame welding device proposed in this invention. Figure 2 This is a rear perspective view of a metal frame welding device proposed in this invention; Figure 3 This is an exploded view of the slide, side frame, and external clamping component of a metal frame welding device proposed in this invention; Figure 4 This is a side frame fastening diagram of a metal frame welding device proposed in this invention; Figure 5 This is a schematic diagram of the slide and inner clamping component of a metal frame welding device proposed in this invention; Figure 6 This is a schematic diagram of the back of the inner clamping component of a metal frame welding device proposed in this invention; Figure 7 This is an enlarged view of the inner support frame and accompanying inner support components of a metal frame welding device proposed in this invention; Figure 8 This is a schematic diagram of the accompanying internal support structure of a metal frame welding equipment proposed in this invention; Figure 9 This is an exploded view of the connecting seat and the follower internal support of a metal frame welding device proposed in this invention; Figure 10 This is a schematic diagram of the bottom structure of a metal frame welding device proposed in this invention; Figure 11 This is a schematic diagram of the lifting platform structure of a metal frame welding equipment proposed in this invention; Figure 12 This is an enlarged view of the bottom of the I-shaped support plate of a metal frame welding equipment proposed in this invention; Figure 13 This is an enlarged schematic diagram of the stepped square plate structure of a metal frame welding equipment proposed in this invention; Figure 14 This is a schematic diagram of the stepped square plate and U-shaped stop bar structure of a metal frame welding equipment proposed in this invention; Figure 15 This invention proposes a metal frame welding device. Figure 13 A magnified structural diagram of part A.

[0022] In the diagram: 1. Frame; 2. I-beam bearing plate; 3. Carriage; 4. Ball screw linear module; 5. Internal clamping components; 501. Thickened square tube; 502. Right-angle frame; 503. Internal support frame; 504. Cross strut; 6. External clamping component; 601. L-shaped plate; 602. Smooth rod; 603. External pressure frame; 604. Cylinder 1; 7. Accompanying internal support component; 701. Cylinder II; 702. Connecting seat; 703. Square rod; 704. Right-angle support plate; 705. Mounting cavity; 706. Electric push rod; 707. Accompanying internal support; 708. Corner clamping component; 7081. Corner cylinder; 7082. Pressure rod; 709. Alignment groove; 8. External pressing component; 801. Bending plate; 802. Cylinder 3; 803. End plate; 804. External pressure plate; 9. Lifting platform; 901. Stepped square opening; 902. Stepped square plate; 903. Bottom support; 904. Multi-section telescopic rod; 905. Multi-section electric telescopic rod; 10. Four-sided limiting assembly; 1001. Stop block; 1002. Slide opening; 1003. U-shaped stop bar; 1004. Cylinder four; 1005. Limiting groove; 1006. Panel; 11. Welding components; 1101. Robotic arm; 1102. Plasma arc welding torch; 12. Metal frame body; 1201. U-shaped frame; 1202. Side frame. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0024] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They 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 limiting the invention.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] Please see Figures 1-15 As shown, a metal frame welding equipment includes a frame 1 that serves as the mounting base for the entire equipment and a metal frame body 12. like Figure 13 As shown, the specific structure of the metal frame body 12 includes a U-shaped frame 1201 and two side frames 1202. Before welding, the two side frames 1202 are respectively connected to the two sides of the opening end of the U-shaped frame 1201 to form a rectangular frame structure to be welded. The parts to be welded are mainly the two short gaps between the U-shaped frame 1201 and the side frames 1202. like Figures 1-2 As shown, an I-shaped support plate 2 is fixedly connected to the inside of the frame 1 by bolts. The I-shaped support plate 2 mainly serves as a support platform during the welding process to support the metal frame body 12 to be welded. Between the frame 1 and the I-shaped support plate 2, two symmetrically arranged slides 3 are slidably installed via guide rails. In order to realize the automated lateral movement of the slides 3, two ball screw linear modules 4 are fixedly connected to the top inner wall of the frame 1 by bolts. The two slides 3 are respectively connected to the moving end of the corresponding ball screw linear module 4, thereby driving the two slides 3 to move closer or further away from each other.

[0027] It should be noted that the ball screw linear module 4 achieves precise linear motion through the coordinated operation of various components: the slide table is the moving part, the ball screw and guide rail form the transmission core, the motor and coupling provide power, and the aluminum alloy profile and support base ensure structural stability. Furthermore, by cooperating with magnetic switches, proximity switches, or photoelectric switches, the displacement of the slide table can be precisely controlled. Those skilled in the art can set it according to actual needs, which will not be elaborated here.

[0028] like Figures 3-7 As shown, each carriage 3 has two inner clamping parts 5 and one outer clamping part 6 installed inside. The inner clamping parts 5 and the outer clamping parts 6 work together to clamp the side frame 1202 from both the inner and outer sides. Specifically, both inner clamping parts 5 include a thickened square tube 501, which is fixedly connected to the bottom of the slide 3 by bolts. A right-angle frame 502 is fixedly connected to the inside of the thickened square tube 501 by bolts. An inner support frame 503 is fixedly connected to the free end of the right-angle frame 502 by bolts. The inner support frame 503 is used to support the side frame 1202 from the inside. Meanwhile, the outer clamping component 6 includes multiple L-shaped plates 601, which are fixedly connected to the bottom inner wall of the slide 3 by bolts. Each L-shaped plate 601 has a set of smooth rods 602 fixedly connected to one side. An outer pressure frame 603 is passed through multiple sets of smooth rods 602. The outer pressure frame 603 is slidably connected to the smooth rods 602 through a sliding sleeve to ensure the smooth movement of the outer pressure frame 603. A cylinder 604 is fixedly connected to the center of the bottom inner wall of the slide 3 by bolts. The piston rod end of the cylinder 604 is connected to the outer pressure frame 603 to drive the outer pressure frame 603 to move laterally along the smooth rods 602. When the cylinder 604 retracts, the outer pressure frame 603 presses the side frame 1202 from the outside, forming a double-sided clamping of the side frame 1202 with the inner support frame 503 on the inside.

[0029] To achieve a stable connection between the two inner support frames 503 and ensure the support accuracy of the inner side of the side frame 1202, a cross strut 504 is bolted between the two inner support frames 503. The distance between the top and bottom of the cross strut 504 is equal to the inner width of the side frame 1202. The two inner support frames 503, the cross strut 504, and the accompanying inner support 7 work together to form a support that fits perfectly with the inner side of the side frame 1202, ensuring that the inner shape of the side frame 1202 remains stable during the welding process.

[0030] like Figures 7-9 As shown, considering that the welding area will generate a high temperature when welding the short gap between the U-shaped frame 1201 and the side frame 1202, which can easily cause thermal deformation of the unwelded parts, especially the inner corner of the joint, in order to solve this problem, each of the two inner support frames 503 on each carriage 3 is provided with a traveling inner support 7 on one side. The traveling inner support 7 is used to support the inner corner of the joint between the side frame 1202 and the U-shaped frame 1201 during the welding process to resist thermal deformation.

[0031] Specifically, the accompanying inner support 7 includes a second cylinder 701 that is fixedly connected to one side of the inner support frame 503 by bolts. The piston rod end of the second cylinder 701 is fixedly connected to a connecting seat 702 by bolts. Two mounting cavities 705 are opened on one side of the connecting seat 702, with one opening facing upwards and the other opening downwards. An electric push rod 706 is fixedly connected to each of the two mounting cavities 705 by bolts, and the two electric push rods 706 face opposite directions. The telescopic end of each electric push rod 706 is fixedly connected to a following inner support 707 by bolts. It should be noted that the electric push rod 706 is existing technology. It is a customized linear actuator with a Hall displacement sensor inside, which realizes precise control of the push rod's extension and retraction displacement. In cooperation with the robotic arm 1101, it realizes the synchronous operation of the welding position and the follow-up inner support 707. Those skilled in the art can set it according to actual needs, which will not be elaborated here.

[0032] The top and bottom ends of the connecting seat 702 are fixedly connected to two square rods 703 by bolts. The two square rods 703 are distributed in an L-shape. The free ends of the two square rods 703 at the same end are fixedly connected to right-angle support plates 704 by bolts. The distance between the opposite sides of the two right-angle support plates 704 is equal to the inner width of the side frame 1202, so as to support the inner corner of the side frame 1202 from the upper and lower ends. The follower inner support 707 has a clearance groove 709 on both sides. The clearance groove 709 is used to avoid the square rods 703, ensuring that the follower inner support 707 will not interfere with the square rods 703 when it moves under the drive of the electric push rod 706.

[0033] Specifically, during plasma arc welding of the short seam, welding proceeds from top to bottom. Simultaneously, the upper electric push rod 706 fully extends, and the follower inner support 707 engages with the upper right-angle support plate 704. The lower electric push rod 706 fully retracts, and the follower inner support 707 engages with the lower surface of the connecting seat 702. When welding the topmost part, the right-angle support plate 704 provides initial support. As welding downwards, the upper electric push rod 706 gradually retracts, causing the follower inner support 707 to slowly move downwards, always maintaining synchronization with the welding position and continuously supporting the side of the welded area. The inner corner of frame 1202 provides effective support until the upper follower inner support 707 is in contact with the upper surface of the connecting seat 702. Welding continues and is supported by the connecting seat 702. When welding downwards beyond the range of the connecting seat 702, the lower electric push rod 706 gradually extends, driving the lower follower inner support 707 to move downwards from the lower surface of the connecting seat 702 to take over the support. This ensures that the inner corner of the side frame 1202 is always stably supported during the entire short seam welding process, thereby ensuring the structural accuracy of the frame after welding.

[0034] During the welding process, the welding area between the U-shaped frame 1201 and the side frame 1202 will heat up rapidly. Although the welding position itself can be clamped and shaped by the inner clamp 5 and the outer clamp 6, the joint of the top bend is still easily affected by the high temperature and deformed, which will affect the assembly of subsequent parts. To solve this problem, a corner clamping part 708 is provided on the upper surface of the right angle support plate 704 located at the top. The corner clamping part 708 cooperates with the right angle support plate 704 to clamp the corner part where the U-shaped frame 1201 and the side frame 1202 are connected. Specifically, the corner clamping component 708 includes a corner cylinder 7081 that is fixedly connected to the upper surface of the top right-angle support plate 704 by bolts. The rotating output end of the corner cylinder 7081 is detachably mounted with a pressure rod 7082 by bolts. When it is necessary to clamp the corner, the corner cylinder 7081 first drives the pressure rod 7082 to rotate directly above the position to be clamped, and then performs the clamping action, so that the pressure rod 7082 is clamped on the upper surface of the corner and forms a clamp with the right-angle support plate 704 below, thereby effectively preventing the part from deforming due to high temperature.

[0035] It should be noted that the 7081 rotary cylinder is a power actuator that converts the pressure energy of compressed air into mechanical energy. Its core feature is that while the piston rod completes linear reciprocating motion, it can also rotate at a preset angle, thereby achieving a composite motion trajectory of "rotating first and then pressing" or "releasing first and then rotating". It can complete complex actions such as avoidance, clearance and pressing within a limited space. This is existing technology, and those skilled in the art can set it according to actual needs, which will not be elaborated here.

[0036] During the welding process, since there is only support force from the inside out, it is impossible to guarantee whether the welding will deform outwards, which will affect the welding quality. To solve this problem, external pressing parts 8 are provided on the inner walls of both sides of the slide 3 to cooperate with the corresponding accompanying inner support parts 7. The external pressing parts 8 are used to press the edge position of the U-shaped frame 1201 to provide reverse constraint. like Figure 5 As shown, specifically, the external pressing component 8 includes a bent plate 801 that is bolted to the inner walls of both sides of the slide 3. A cylinder 802 is bolted to one side of the bent plate 801. An end plate 803 is bolted to the piston end of the cylinder 802. An outer pressure plate 804 is bolted to one side of the end plate 803. When the cylinder 701 of the accompanying inner support component 7 extends, the cylinder 802 of the external pressing component 8 also extends synchronously, so that the outer pressure plate 804 is attached to the outer edge of the U-shaped frame 1201. This works in conjunction with the accompanying inner support component 7 to clamp the welded parts in both directions, preventing the welded parts from deforming outwards.

[0037] like Figures 10-12As shown, in order to facilitate the removal of the welded metal frame body 12 from the equipment after welding, a lifting platform 9 is provided inside the I-shaped support plate 2; Specifically, the lifting platform 9 includes a stepped square opening 901 located in the middle of the I-shaped support plate 2. A bottom support 903 is bolted to the lower surface of the I-shaped support plate 2. A multi-section electric telescopic rod 905 is bolted to the center of the upper surface of the bottom support 903. A stepped square plate 902 is bolted to the piston rod end of the multi-section electric telescopic rod 905. A multi-section telescopic rod 904 is bolted to the four corners of the lower surface of the stepped square plate 902 and the corresponding positions between the bottom support 903 and the bottom support 903. The multi-section telescopic rod 904 serves as a guide element to ensure the stability of the lifting of the stepped square plate 902. The stepped square plate 902 and the stepped square opening 901 fit together. It should be noted that the multi-section electric telescopic rod 905 is an actuator that converts rotary motion into linear motion. Its core structure typically consists of a drive motor, a reduction mechanism, a lead screw pair, and a multi-stage sleeve. Compared with traditional single-stage electric telescopic rods, the multi-section electric telescopic rod 905 can maintain a shorter length in the retracted state, while achieving a stroke several times its retracted length when extended. It features a compact structure, large stroke, and small footprint, making it particularly suitable for applications where installation space is limited but a large lifting stroke is required. This is existing technology, and those skilled in the art can configure it according to actual needs, which will not be elaborated here.

[0038] When it is necessary to retrieve the part, the multi-section electric telescopic rod 905 retracts, pulling the stepped square plate 902 downward, so that the welded metal frame body 12 moves down and away from the I-shaped support plate 2, making it easy to remove.

[0039] like Figures 13-15 As shown, in order to ensure the positioning accuracy of the U-shaped frame 1201 during the welding process and to prevent displacement during the welding process, thereby affecting the welding quality, a four-sided limiting component 10 for limiting the U-shaped frame 1201 is installed on the stepped square plate 902. Specifically, the four-sided limiting assembly 10 includes two rows of stop blocks 1001 fixedly connected to the upper surface of the stepped square plate 902 by bolts. The two rows of stop blocks 1001 are used to limit the two bottom edges of the U-shaped frame 1201. Two sliding openings 1002 are opened on the upper surface of the stepped square plate 902 near the other two sides. U-shaped stop bars 1003 are slidably installed in the two sliding openings 1002 on the same side. The U-shaped stop bars 1003 are used to limit the two sides of the U-shaped frame 1201. Two cylinders 1004 are fixedly connected to the lower surface of the stepped square plate 902 by bolts. The two cylinders 1004 are used to drive the corresponding U-shaped stop bars 1003 to slide up and down along the sliding openings 1002.

[0040] Since the U-shaped stop bar 1003 may affect the feeding of the side frame 1202 during its extension, but if the U-shaped stop bar 1003 is completely retracted during the feeding process, it cannot be guaranteed that the U-shaped frame 1201 will not undergo slight displacement during welding. To prevent slight displacement of the U-shaped frame 1201, a limiting groove 1005 is provided at the top of the opening of the slide 1002. One side of each end of the U-shaped stop bar 1003 is fixedly connected with a bolt to cooperate with the limiting groove 1005. The thickness of the panel 1006 is equal to that of the U-shaped frame 1201. The depth of the limiting groove 1005 is half the thickness of the panel 1006. When the U-shaped stop bar 1003 moves downward to the limiting position, half of the panel 1006 is embedded in the limiting groove 1005, and the other half is exposed. The exposed part is half the thickness of the U-shaped frame 1201. This can limit the side of the U-shaped frame 1201 without affecting the feeding of the side frame 1202 due to the protrusion.

[0041] It should be noted that cylinders 604, 701, 802, and 1004 are all power actuators that convert the pressure energy of compressed air into mechanical energy. By controlling the gas inlet and outlet, they drive the piston to perform linear reciprocating motion. They can be used in conjunction with magnetic switches, proximity switches, or photoelectric switches to achieve precise control of the extension and retraction displacement of the cylinder piston rod. Those skilled in the art can set these parameters according to actual needs, which will not be elaborated here.

[0042] like Figure 11 As shown, in order to automate the welding process, the equipment is also equipped with a welding assembly 11. The welding assembly 11 includes two robotic arms 1101 that are fixedly connected to the upper surface of the bottom support 903 by bolts. The ends of the robotic arms 1101 are fixedly connected to a plasma arc welding torch 1102 by bolts. During the welding process, the robotic arms 1101 move according to a preset trajectory, driving the plasma arc welding torch 1102 to precisely weld the short gap between the U-shaped frame 1201 and the side frame 1202.

[0043] The robotic arm 1101 is a multi-axis robotic arm, which includes a robotic arm frame consisting of a base, upper arm, lower arm and six rotary joints connected in series, a drive element driven by a servo motor, a transmission component consisting of a reducer and synchronous belt, a control component consisting of a motion controller, servo driver and host computer software, and a standard flange interface for mounting the welding torch end effector interface. The multi-axis robotic arm is a highly flexible automated execution mechanism that can achieve arbitrary motion trajectories in three-dimensional space. Its core advantage lies in the coordinated movement of multiple rotary joints, which allows the plasma arc welding torch 1102 at the end to reach any position in space and approach the weld at any angle. This is existing technology, and those skilled in the art can set it according to actual needs, which will not be elaborated here.

[0044] By integrating a robotic arm 1101 and a plasma arc welding gun 1102 on the bottom support, and combining the double-sided clamping of the side frame 1202 and the double-sided clamping of the joint after the side frame 1202 and the U-shaped frame 1201 are combined, a semi-automatic splicing and welding equipment is constructed to prevent deformation caused by high temperature during welding. The robotic arm 1101 can accurately perform welding operations according to the preset trajectory, avoiding the instability of manual welding. While ensuring uniform and beautiful welds, it greatly improves the overall strength of metal frame splicing in mass production.

[0045] The inner clamping component 5 and the outer clamping component 6 achieve double-sided clamping of the side frame 1202, the accompanying inner support component 7 and the outer pressing component achieve anti-deformation, and the multi-axis robotic arm and the plasma arc welding system are organically integrated to construct an intelligent device for splicing and welding the metal frame body 12. The inner clamping component 5 and the outer clamping component 6 work together to achieve double-sided automatic clamping of the side frame 1202. The accompanying inner support component 7, the corner clamping component 708 and the outer pressing component 8 together constitute the anti-deformation component. The robotic arm 1101 works with the plasma arc welding gun 1102 to achieve precision welding. The lifting platform 9 and the four-sided limiting component 10 facilitate material unloading, greatly improve production efficiency, and realize intelligent manufacturing that automates the entire process from placing the workpiece, then positioning, clamping, welding, anti-deformation to taking out the finished product. This significantly improves welding accuracy, quality stability and operational safety.

[0046] Plasma arc welding is a high-energy-density welding method that uses a plasma arc as a heat source. The basic principle is to use the compressed arc generated between the tungsten electrode inside the plasma arc welding gun 1102 and the workpiece to form a plasma arc with extremely high temperature and concentrated energy, thereby achieving the melting and joining of metal materials. Combined with the robotic arm 1101, it realizes automated precision welding of complex spatial trajectories. The robotic arm 1101, as a motion actuator, adopts a multi-axis robotic arm (usually with six degrees of freedom) and can achieve trajectory movement of arbitrary posture in three-dimensional space. The plasma arc welding gun 1102 is installed at the end of the robotic arm 1101 and achieves precise welding trajectory tracking with the movement of the robotic arm 1101. During its movement, the robotic arm 1101 always maintains the axis of the plasma arc welding torch 1102 at a preset angle (usually 80°~90°) with the weld surface to ensure the penetration depth of the plasma arc and the formation effect of the molten pool. The flexible posture adjustment capability of the robotic arm 1101 can adapt to the spatial angle changes of different weld positions.

[0047] The specific steps involved in using it are as follows: S1: First, the U-shaped frame 1201 is positioned by the four-sided limiting assembly 10. The cylinder 1004 retracts to drive the U-shaped stop bar 1003 to move upward and extend the slide 1002. Together with the two rows of stop blocks 1001, the four sides of the U-shaped frame 1201 are limited. Then, the U-shaped frame 1201 is placed on the stepped square plate 902 of the lifting platform 9, and the four sides of the U-shaped frame 1201 are limited by the two U-shaped stop bars 1003 and the two rows of stop blocks 1001. S2: Then, fasten the two side frames 1202 to the sides of the two inner clamping parts 5 respectively, so that the inner side of the side frame 1202 contacts the inner support frame 503 and the right angle support plate 704 of the accompanying inner support part 7. Activate the second cylinder 701 in the accompanying inner support part 7 to push the connecting seat 702 to move to the two sides of the side frame 1202, so that the right angle support plate 704 fits against the inner corner of the side frame 1202. Then activate the first cylinder 604 to pull the outer pressure frame 603 to press the side frame 1202 from the outside, forming a double-sided clamping of the side frame 1202 with the inner support frame 503. S3: Next, the ball screw linear module 4 drives the two slides 3 to move closer to each other. During the process of approaching, the cylinder 4 1004 extends to drive the U-shaped stop bar 1003 to move downward until the insert plate 1006 on the side of the end of the U-shaped stop bar 1003 is embedded in the limiting groove 1005. At this time, the exposed part of the U-shaped stop bar 1003 is half the wall thickness of the U-shaped frame 1201, so as to avoid affecting the movement of the side frame 1202. Finally, the side frame 1202 held by the inner clamping part 5 and the outer clamping part 6 on the two slides 3 moves to the position corresponding to the side frame 1202 to be welded. Subsequently, cylinder 802 in the external pressing component 8 is activated to push the outer pressure plate 804 to press against the outer edge of the U-shaped frame 1201. This, together with the accompanying inner support component 7, clamps the welded parts in both directions. Then, the corner cylinder 7081 in the corner pressing component 708 is activated to rotate the pressure rod 7082 to the corner where the U-shaped frame 1201 connects with the side frame 1202 (i.e., the joint position at the bend edge opening of the U-shaped frame 1201 and the side frame 1202), and presses the corner down.

[0048] S4: After the docking is completed, the welding assembly 11 is started. The robotic arm 1101 drives the plasma arc welding gun 1102 to move along the predetermined trajectory to perform plasma arc welding on the two short gaps (i.e., the vertical position) between the U-shaped frame 1201 and the side frame 1202. The welding method can be either pull welding or spot welding followed by full welding. At the same time as the plasma arc welding is performed, the electric push rod 706 in the accompanying inner support 7 is started to drive the following inner support 707 to move up or down, so that the following inner support 707 abuts against the inner wall of the U-shaped frame 1201 and the side frame 1202, further filling the internal space of the support and preventing welding deformation. After the vertical position welding is completed, the corner cylinder 7081 is reset and drives the pressure rod 7082 to rotate and move upward to reset, so that the docking position at the opening of the bent edge of the U-shaped frame 1201 and the side frame 1202 is avoided. At this time, the welding assembly 11 is used to perform plasma arc welding on the docking position at the opening of the bent edge. S5: After all welding is completed, the welding assembly 11 is retracted, the external pressing part 8, the accompanying inner support part 7, and the outer clamping part 6 are released in sequence, and the ball screw linear module 4 is started to drive the slide 3 to move inward, so that the inner clamping part 5 is disengaged from the side frame 1202.

[0049] Next, by retracting the multi-section electric telescopic rod 905, the stepped square plate 902 is moved down, which in turn moves the welded metal frame body 12 down. Finally, the metal frame is removed from the stepped square plate 902. After removal, the ball screw linear module 4 is activated to reset the slide 3, and the stepped square plate 902 moves up to reset, completing one work cycle.

[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A metal frame welding equipment, comprising a frame (1), characterized in that, The frame (1) is equipped with an I-shaped support plate (2) for welding support. Two symmetrical slides (3) are slidably installed between the frame (1) and the I-shaped support plate (2) via guide rails. Two ball screw linear modules (4) are installed on the inner wall of the top of the frame (1) to make the slides (3) move laterally. Each slide (3) is equipped with two inner clamping parts (5) and one outer clamping part (6). The inner clamping parts (5) and the outer clamping parts (6) are used to clamp the side frame (1202) on both sides. The two inner clamping members (5) include a thickened square tube (501), a right angle bracket (502) is installed inside the thickened square tube (501), and an inner support bracket (503) is installed at the free end of the right angle bracket (502). Each of the two inner support frames (503) on each carriage (3) is provided with a traveling inner support (7) on one side. The traveling inner support (7) is used to support the inner corner of the fitting between the side frame (1202) and the U-shaped frame (1201). The inner walls on both sides of the carriage (3) are provided with an external pressing member (8) that works with the corresponding traveling inner support member (7). The external pressing member (8) is used to press the edge of the U-shaped frame (1201). The metal frame welding equipment also includes a lifting platform (9), a four-sided limiting component (10) for limiting the U-shaped frame (1201), and a welding component (11) for welding. A stepped square opening (901) is provided in the middle of the I-shaped support plate (2); The lifting platform (9) includes a bottom bracket (903) fixedly connected to the lower surface of the I-shaped support plate (2). Multiple electric telescopic rods (905) are fixedly connected at the center of the upper surface of the bottom bracket (903). A stepped square plate (902) is fixedly connected to the piston rod end of the multiple electric telescopic rods (905). Multiple telescopic rods (904) are fixedly connected at the four corners of the lower surface of the stepped square plate (902) and at the corresponding positions between the bottom bracket (903). The stepped square plate (902) and the stepped square opening (901) fit together; The four-sided limiting component (10) includes two rows of blocks (1001) fixedly connected to the upper surface of the stepped square plate (902), and the blocks (1001) are used to limit the two bottom edges of the U-shaped frame (1201); The welding assembly (11) includes two robotic arms (1101) fixedly connected to the upper surface of the bottom support (903).

2. The metal frame welding equipment according to claim 1, characterized in that, The accompanying inner support (7) includes a cylinder two (701) fixedly connected to one side of the inner support frame (503). The piston rod end of the cylinder two (701) is fixedly connected to a connecting seat (702). Two mounting cavities (705) are opened on one side of the connecting seat (702). The two mounting cavities (705) are a top opening and a bottom opening, respectively. Both of the mounting cavities (705) are fixedly connected to electric push rods (706) facing opposite directions, and the telescopic ends of the electric push rods (706) are fixedly connected to follower inner supports (707).

3. The metal frame welding equipment according to claim 2, characterized in that, The top and bottom ends of the connecting seat (702) are fixedly connected to two square rods (703), and the two square rods (703) are distributed in an L-shape. The free ends of the two square rods (703) at the same end are fixedly connected to right angle support plates (704). The distance between the opposite sides of the two right angle support plates (704) is equal to the inner width of the side frame (1202). Both sides of the follow-up inner support (707) are provided with clearance grooves (709) to avoid the opposite rod (703).

4. The metal frame welding equipment according to claim 3, characterized in that, The upper surface of the right-angle support plate (704) located at the top is provided with a corner clamping member (708), which cooperates with the right-angle support plate (704) to clamp the corner where the U-shaped frame (1201) and the side frame (1202) are connected; The corner clamping component (708) includes a corner cylinder (7081) fixedly connected to the upper surface of the top right-angle support plate (704). The rotating output end of the corner cylinder (7081) is detachably mounted with a pressure rod (7082) by bolts. The corner cylinder (7081) and the pressure rod (7082) cooperate to perform the clamping action.

5. The metal frame welding equipment according to claim 1, characterized in that, The external pressing component (8) includes a bent plate (801) fixedly connected to the inner walls of both sides of the slide (3). A cylinder three (802) is fixedly connected to one side of the bent plate (801). An end plate (803) is fixedly connected to the piston end of the cylinder three (802). An external pressure plate (804) is fixedly connected to one side of the end plate (803).

6. The metal frame welding equipment according to claim 1, characterized in that, The stepped square plate (902) has two sliding openings (1002) on its upper surface near the other two sides. U-shaped stop bars (1003) are slidably installed in the two sliding openings (1002) on the same side. The U-shaped stop bars (1003) are used to limit the two sides of the U-shaped frame (1201). Two cylinders (1004) are fixedly connected to the lower surface of the stepped square plate (902) for pushing and pulling the U-shaped stop bars (1003) to slide up and down along the sliding openings (1002). The top of the opening of the slide (1002) is provided with a limiting groove (1005), and one side of each end of the U-shaped stop (1003) is fixedly connected with a panel (1006) that works in conjunction with the limiting groove (1005). The thickness of the panel (1006) is equal to the thickness of the U-shaped frame (1201), and the depth of the limiting groove (1005) is half the thickness of the panel (1006).

7. The metal frame welding equipment according to claim 1, characterized in that, The external clamping member (6) includes multiple L-shaped plates (601) fixedly connected to the inner wall of the bottom of the slide (3). Each L-shaped plate (601) has a set of light rods (602) fixedly connected to one side. An external pressure frame (603) is threaded through the multiple sets of light rods (602) and slidably connected to them via a sliding sleeve. A cylinder (604) is fixedly connected at the center of the inner wall of the bottom of the slide (3) to move the external pressure frame (603) laterally along the light rods (602). A cross strut (504) is fixedly connected between the two inner support frames (503). The distance between the top and bottom of the cross strut (504) is equal to the width of the inner side of the side frame (1202). The two inner support frames (503), the cross strut (504), and the accompanying inner support member (7) cooperate to form a support part that fits into the inner side of the side frame (1202).

8. The metal frame welding equipment according to claim 1, characterized in that, The end of the robotic arm (1101) is fixedly connected to a plasma arc welding gun (1102), and the robotic arm (1101) is used to drive the plasma arc welding gun (1102) to move along a predetermined trajectory.

9. A method for welding a metal frame, applicable to the metal frame welding equipment described in claim 1, characterized in that, Includes the following steps: Step 1: Installation and pre-positioning of U-shaped frame (1201): Place U-shaped frame (1201) on I-shaped support plate (2), and use the four-sided limiting component (10) driven by lifting platform (9) to pre-position U-shaped frame (1201), so that U-shaped frame (1201) is centered and its horizontal movement is restricted. The side frame (1202) is loaded and installed. The two side frames (1202) are respectively fastened to one side of the inner clamp (5), and the inner wall of the side frame (1202) is pressed from the inside by the outer clamp (6), so as to complete the double-sided clamping and fixing of the side frame (1202). Step 2: Start the two ball screw linear modules (4) and drive the two carriages (3) to move laterally along the guide rail towards the U-shaped frame (1201) until the side frame (1202) held by the inner clamping part (5) and the outer clamping part (6) on the carriage (3) reaches the position to be welded. The accompanying inner support part (7) supports the inner edge and corner of the side frame (1202). Then the outer pressing part (8) applies pressure from the edge position of the U-shaped frame (1201). The outer pressing part (8) and the accompanying inner support part (7) cooperate to complete the double-sided extrusion. Step 3: Welding. The welding assembly (11) is welded to the joint between the U-shaped frame (1201) and the two side frames (1202) along a predetermined trajectory. During the welding process, the accompanying inner support (7) can move synchronously with the welding position and continuously provide support for the inner corner; Step 4: Unloading. After welding is completed, the welding assembly (11) is retracted, and the external pressing part (8), the accompanying inner support part (7), and the outer clamping part (6) are released in sequence. The ball screw linear module (4) is started to drive the slide (3) to move inward, so that the inner clamping part (5) is disengaged from the side frame (1202). Next, the welded metal frame body (12) is moved down by the lifting platform (9), and finally the metal frame is removed from the I-shaped support plate (2). After removal, the slide (3) is reset by the ball screw linear module (4), and the lifting platform (9) is moved up to reset.

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