A folding chair cross brace welding device

Abstract

The present invention belongs to the field of other special equipment manufacturing, specifically a folding chair cross brace welding device, including a frame, a transmission mechanism is provided in the frame, and two sets of welding mechanisms are symmetrically provided on both sides of the frame, a conveyor belt mechanism is provided at the bottom of the frame, the transmission mechanism includes two sets of transmission shafts, the two sets of transmission shafts are rotatably installed in the frame, two sets of sprockets are symmetrically installed on the transmission shafts, the chains engage the two sets of sprockets, and several sets of assembly frames for assembling cross braces are arranged around the two sets of chains, the cross brace is composed of two sets of vertical rods and one set of cross rods, the welding mechanism includes a fixed plate, one end of the fixed plate is fixedly connected to the frame, two sets of guide rails symmetrically installed on the fixed plate, and a laser welding gun that is slidably connected to the guide rails; after the cross brace is welded, it will make a circular motion with the assembly frame and automatically fall onto the conveyor belt mechanism, without the need for staff to remove the cross brace, which not only reduces the workload of the staff, but also improves the automation rate of the device.

Description

Technical Field

[0001] The invention belongs to the field of other special equipment manufacturing, in particular to a folding chair cross brace welding device. Background Art

[0002] During the processing and assembly of folding chairs, some components are assembled by welding. For example, when welding the cross brace, the cross brace and the corresponding assembly parts are first pre-assembled on the welding device, and then the welding gun on the welding device is used to automatically weld the joints, thereby realizing the welding processing of the cross brace. This type of welding device belongs to the manufacturing of other special equipment.

[0003] The patent with announcement number CN221064940U discloses an automatic welding machine for folding chair cross braces, including a base, a welding machine assembly, and a rotating structure. The welding machine assembly includes a concave frame, a first motor, a screw, a movable plate and other structures. The rotating structure includes a second motor, a rotating gear, a gear rotating disk, a storage rack, a limiting structure and other structures. This solution sets up a rotating structure and a limiting structure. When in use, it is placed in the place where work is required through the base, and the power equipment is turned on to make it reach the working operating conditions. Compared with traditional welding machines, it saves labor costs, improves welding work efficiency, and adds a limiting function.

[0004] In the above scheme, before welding the cross brace, the cross brace needs to be assembled to the frame. After welding the cross brace, the staff needs to remove the cross brace from the frame before assembling the new cross brace to the frame. This operation method not only makes the automation rate of the device relatively low, but also increases the workload of the staff. For this reason, the present invention provides a cross brace welding device for a folding chair. Summary of the Invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the present invention to solve its technical problems is as follows: a folding chair cross brace welding device described in the present invention comprises a frame, a transmission mechanism is provided in the frame, and two sets of welding mechanisms are symmetrically provided on both sides of the frame, a conveyor belt mechanism is provided at the bottom of the frame, the transmission mechanism comprises two sets of transmission shafts, the two sets of transmission shafts are rotatably installed in the frame, two sets of sprockets are symmetrically installed on the transmission shafts, chains engage the two sets of sprockets, and several sets of assembly frames for assembling cross braces are arranged around the two sets of chains, the cross braces are composed of two sets of vertical rods and one set of cross rods, the welding mechanism comprises a fixed plate, one end of the fixed plate is fixedly connected to the frame, two sets of guide rails symmetrically installed on the fixed plate, a laser welding gun slidably connected to the guide rails, a receiving plate for connecting the two sets of laser welding guns, and a cylinder fixedly installed on the fixed plate for driving the receiving plate;

[0007] After welding, the cross brace will move in a circle with the assembly frame and automatically fall onto the conveyor belt mechanism. There is no need for workers to remove the cross brace, which not only reduces the workload of workers but also improves the automation rate of the device.

[0008] Preferably, the assembly frame includes a base, two sets of chains fixedly connected on both sides of the base, a support frame fixedly mounted on the base for placing a cross bar, a movable plate movably mounted in the lower end of the base, two sets of push columns fixedly mounted on the movable plate, a rotating sleeve movably plugged into the push columns, the rotating sleeve rotatably mounted in the base, six sets of movable blocks arranged at equal angles at the upper end of the rotating sleeve, a splint fixedly connecting the movable blocks, a spring arranged between the movable plate and the inner wall of the base, a plurality of sets of rectangular grooves opened on the base, the movable blocks are plugged into the guide columns, and the guide columns are fixed Installed in the rectangular groove, the movable block is slidably connected to the rectangular groove, six groups of oblique grooves are opened at equal angles on the upper end surface of the rotating sleeve, a receiving shaft is provided at the lower end of the movable block, the receiving shaft is located in the oblique groove, two groups of spiral grooves are opened on the outer ring of the rotating sleeve, two groups of pins are provided on the outer ring of the push column, the pins are located in the spiral grooves, rollers are rotatably installed on the lower end of the movable plate, a guide plate is provided in the frame, both ends of the guide plate are rotatably connected to the two groups of transmission shafts, the rollers roll and link the outer ring of the guide plate, and the outer ring of the guide plate is composed of a first ring surface, an inclined surface, and a second ring surface;

[0009] Since the inner diameter of the area enclosed by the six groups of plywood is adjustable, it is convenient for workers to assemble the cross brace to the support frame.

[0010] Preferably, the support frame includes a fixed sleeve, the fixed sleeve is fixedly mounted on the base, a telescopic plate movably mounted in the fixed sleeve, two groups of receiving blocks symmetrically arranged on both sides of the telescopic plate, one end of the two groups of rotating shafts are respectively rotatably connected to the two groups of receiving blocks, an arc groove for placing a cross bar is provided on the upper end of the telescopic plate, two groups of arc bars for supporting the rotating shaft are symmetrically provided on one end of the frame, guide grooves are opened on both sides of the fixed sleeve, and the receiving blocks are slidably connected to the guide grooves;

[0011] When the cross brace breaks free from the adsorption of the telescopic plate, the descending speed of the cross brace will be significantly reduced, thereby reducing the impact force of the cross brace on the conveyor belt mechanism, reducing the damage to the conveyor belt mechanism, and increasing the service life of the conveyor belt mechanism.

[0012] The beneficial effects of the present invention are as follows:

[0013] 1. After the cross brace is welded, it will move in a circle with the assembly frame and automatically fall onto the conveyor belt mechanism. There is no need for workers to remove the cross brace, which not only reduces the workload of the workers but also improves the automation rate of the device.

[0014] 2. When the assembly frame is located at the discharge point, the six groups of splints are in a separated state, and the inner diameter of the area surrounded by the six groups of splints is slightly larger than the outer diameter of the vertical rod, so that the vertical rod can be easily inserted into the area surrounded by the six groups of splints. Then the cross bar is placed on the upper end of the support frame to realize the pre-assembly of the cross brace. When the assembly frame makes a circular motion, the roller at the lower end of the assembly frame first rolls along the first annular surface, and then the roller is squeezed by the inclined surface, so that the roller drives the movable plate together with the two groups of push columns to move upward, and the movable plate compresses the spring, and at the same time The push column drives the two sets of pins to slide along the corresponding spiral grooves, causing the rotating sleeve to rotate. As the rotating sleeve rotates, the receiving shaft slides along the oblique groove, causing the six sets of splints to close and clamp the vertical rod until the roller rolls to the second ring surface, thereby correcting the position of the vertical rod and fixing the cross brace. After the cross brace is welded, as the assembly frame makes a circular motion, the roller will roll back to the first ring surface under the action of the spring rebound force, which will release the clamping of the six sets of splints on the vertical rod, and the cross brace will automatically fall onto the conveyor belt mechanism.

[0015] 3. When the cross bar is placed on the support frame, the cross bar is located in the arc groove, and the telescopic plate has a certain adsorption force on the cross bar. After the cross brace is welded, as the assembly frame makes a circular motion, the rotating shaft will roll along the arc bar until the rotating shaft is staggered from the arc bar. At this time, the cross brace falls, and the cross brace drives the telescopic plate to move downward through the cross bar. The telescopic plate drives the receiving block to slide along the guide groove, and the rotating shaft moves downward with the receiving block until the telescopic plate can no longer move downward. At this time, the gravity of the cross brace is greater than the adsorption force of the telescopic plate, causing the cross bar to break free from the adsorption of the telescopic plate. When the cross brace breaks free from the adsorption of the telescopic plate, the descending speed of the cross brace will be significantly reduced, thereby reducing the impact force of the cross brace on the conveyor belt mechanism, reducing the damage to the conveyor belt mechanism, and improving the service life of the conveyor belt mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the cross-section of the frame, transmission mechanism, welding mechanism, and cross brace assembly of the present invention.

[0019] Figure 3 It is a schematic diagram of the transmission mechanism, welding mechanism and cross brace assembly of the present invention.

[0020] Figure 4 It is a schematic diagram of the assembly frame and cross brace combination of the present invention.

[0021] Figure 5 This is a schematic diagram of the assembly of the push column, rotating sleeve and movable block of the present invention.

[0022] Figure 6This is a schematic diagram of the cross-section of the frame, transmission shaft, assembly frame, and welding mechanism of the present invention.

[0023] Figure 7 It is a schematic diagram of the base, support frame and cross brace combination of the present invention.

[0024] Figure 8 This is a schematic diagram of the cross-section of the frame, sprocket, chain, transmission shaft, and assembly frame of the present invention.

[0025] Figure: 1, frame; 101, guide plate; 11, first ring surface; 12, inclined surface; 13, second ring surface; 102, arc strip; 2, transmission mechanism; 3, welding mechanism; 4, conveyor belt mechanism; 5, cross brace; 501, vertical rod; 502, cross rod; 201, transmission shaft; 202, sprocket; 203, chain; 204, assembly frame; 301, fixing plate; 302, guide rail; 303, laser welding gun; 304, receiving plate; 305, cylinder; 2041, base ; 411, rectangular groove; 2042, support frame; 2043, movable plate; 431, roller; 2044, push column; 441, pin shaft; 2045, rotating sleeve; 451, spiral groove; 452, oblique groove; 2046, movable block; 461, guide column; 462, receiving shaft; 2047, splint; 2048, spring; 421, fixed sleeve; 422, telescopic plate; 423, receiving block; 424, rotating shaft; 425, arc groove; 426, guide groove. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0027] Example 1: Figures 1 to 3 As shown, a folding chair cross brace welding device according to an embodiment of the present invention includes a frame 1, a transmission mechanism 2 is provided in the frame 1, and two sets of welding mechanisms 3 are symmetrically provided on both sides of the frame 1, a conveyor belt mechanism 4 is provided at the bottom of the frame 1, the transmission mechanism 2 includes two sets of transmission shafts 201, the two sets of transmission shafts 201 are rotatably installed in the frame 1, two sets of sprockets 202 are symmetrically installed on the transmission shafts 201, chains 203 engage the two sets of sprockets 202, and a chain 203 is arranged around the two sets of chains 203. There are several groups of assembly frames 204 for assembling cross braces 5. The cross braces 5 are composed of two groups of vertical rods 501 and a group of cross rods 502. The welding mechanism 3 includes a fixed plate 301, one end of the fixed plate 301 is fixedly connected to the frame 1, two groups of guide rails 302 are symmetrically installed on the fixed plate 301, a laser welding gun 303 slidably connected to the guide rails 302, a receiving plate 304 for connecting the two groups of laser welding guns 303, and a cylinder 305 fixedly installed on the fixed plate 301 for driving the receiving plate 304.

[0028] Specifically, before welding the cross brace 5, two sets of vertical bars 501 and one set of cross bars 502 are placed on the assembly rack 204 at the discharge point. Figure 1 The position indicated by the middle arrow is the discharge point, so that two sets of vertical rods 501 and a set of horizontal rods 502 are assembled into a horizontal support 5, and then a set of transmission shafts 201 are driven by a motor to rotate, and the transmission shafts 201 drive two sets of sprockets 202 to rotate, and the two sets of sprockets 202 drive two sets of chains 203 together with several sets of assembly frames 204 to do circular motion, and the attached Figure 2 The direction indicated by the middle arrow is the direction of circular motion, until the assembly rack 204 with the cross brace 5 is moved between the two sets of welding mechanisms 3, and then the two sets of cylinders 305 are started. The cylinders 305 push the receiving plates 304 to move the two sets of laser welding guns 303 along the corresponding guide rails 302 toward the cross brace 5, so that the ends of the laser welding guns 303 are close to the welding point position of the cross brace 5, and then the cross brace 5 is welded by the laser welding guns 303. In this process, the cross brace 5 is assembled on the next set of assembly racks 204. After the welding is completed, the laser welding guns 303 are withdrawn, and several sets of assembly racks 204 are driven to perform circular motion. , so that the next group of assembly racks 204 move to the two groups of welding mechanisms 3 for welding. At the same time, as several groups of assembly racks 204 make circular motions, the welded cross braces 5 will move to the bottom of the frame 1. Under the action of gravity, the cross braces 5 will fall onto the conveyor belt mechanism 4, and the cross braces 5 will be transported away by the conveyor belt mechanism 4. Then the above operation is repeated in a cycle. Compared with the existing technology, after the welding is completed, the cross braces 5 will make circular motions with the assembly racks 204 and automatically fall onto the conveyor belt mechanism 4. There is no need for staff to take away the cross braces 5, which not only reduces the workload of the staff, but also improves the automation rate of the device.

[0029] like Figures 4 to 6As shown, the assembly frame 204 includes a base 2041, two groups of chains 203 are fixedly connected on both sides of the base 2041, a support frame 2042 fixedly mounted on the base 2041 for placing the cross bar 502, a movable plate 2043 movably mounted in the lower end of the base 2041, two groups of push columns 2044 fixedly mounted on the movable plate 2043, a rotating sleeve 2045 movably plugged into the push columns 2044, the rotating sleeve 2045 is rotatably mounted in the base 2041, six groups of movable blocks 2046 are arranged at equal angles at the upper end of the rotating sleeve 2045, a clamping plate 2047 fixedly connected to the movable blocks 2046, a spring 2048 arranged between the movable plate 2043 and the inner wall of the base 2041, and a plurality of groups of rectangular grooves 411 are opened on the base 2041, and the movable blocks 2046 are plugged into the guide columns 4 61, the guide column 461 is fixedly installed in the rectangular groove 411, the movable block 2046 is slidably connected to the rectangular groove 411, six groups of oblique grooves 452 are opened at equal angles on the upper end surface of the rotating sleeve 2045, and a receiving shaft 462 is provided at the lower end of the movable block 2046. The receiving shaft 462 is located in the oblique groove 452, and two groups of spiral grooves 451 are opened on the outer ring of the rotating sleeve 2045. Two groups of pins 441 are provided on the outer ring of the pushing column 2044, and the pins 441 are located in the spiral groove 451. The lower end of the movable plate 2043 is rotatably installed with a roller 431, and a guide plate 101 is provided in the frame 1. The two ends of the guide plate 101 are respectively rotatably connected to the two groups of transmission shafts 201, and the roller 431 is rollingly connected to the outer ring of the guide plate 101. The outer ring of the guide plate 101 consists of a first annular surface 11, an inclined surface 12, and a second annular surface 13.

[0030] Specifically, the upper end of the support frame 2042 is made of a magnetic material, and the upper end of the support frame 2042 has a certain adsorption force on the cross bar 502, and the adsorption force is less than the gravity of the entire cross brace 5. In order to ensure the accuracy of the laser welding gun 303 in welding the cross brace 5, the assembly points of the assembly frame 204 and the two sets of vertical bars 501 and one set of cross bars 502 are designed to be relatively compact. Some ends of the vertical bars 501 will have burrs caused by cutting, making it difficult to assemble the vertical bars 501 on the assembly frame 204. Even if it is assembled on the assembly frame 204, the vertical bars 501 will get stuck on the assembly frame 204. 04, so that the cross brace 5 cannot fall onto the conveyor belt mechanism 4. When the assembly rack 204 is located at the discharge point, the six groups of splints 2047 are in a separated state, and the inner diameter of the area surrounded by the six groups of splints 2047 is slightly larger than the outer diameter of the vertical rod 501, so that the vertical rod 501 can be easily inserted into the area surrounded by the six groups of splints 2047. Then, the cross bar 502 is placed on the upper end of the support rack 2042, and the position and distance of the end of the cross bar 502 relative to the vertical rod 501 are adjusted to realize the pre-assembly of the cross brace 5. When the assembly rack 204 makes a circular motion, the assembly rack 204 The roller 431 at the lower end first rolls along the first annular surface 11, and then the roller 431 is squeezed by the inclined surface 12, so that the roller 431 drives the movable plate 2043 and the two sets of push pins 2044 to move upward, and the movable plate 2043 compresses the spring 2048. At the same time, the push pins 2044 drive the two sets of pins 441 to slide along the corresponding spiral grooves 451, so that the rotating sleeve 2045 rotates. As the rotating sleeve 2045 rotates, the receiving shaft 462 slides along the oblique groove 452. Under the guidance of the oblique groove 452, the six sets of splints 2047 are closed, and Clamp the vertical rod 501 until the roller 431 rolls onto the second annular surface 13 to correct the position of the vertical rod 501 and fix the cross brace 5. After the cross brace 5 is welded, as the assembly frame 204 makes a circular motion, under the action of the rebound force of the spring 2048, the roller 431 will roll back to the first annular surface 11, and the six groups of splints 2047 will release the clamping of the vertical rod 501. The cross brace 5 will automatically fall onto the conveyor belt mechanism 4. Since the inner diameter of the area enclosed by the six groups of splints 2047 is adjustable, it is convenient for the staff to assemble the cross brace 5 to the support frame 2042.

[0031] Example 2: Figure 7 and Figure 8As shown, compared with Example 1, another embodiment of the present invention is: the support frame 2042 includes a fixed sleeve 421, the fixed sleeve 421 is fixedly installed on the base 2041, a telescopic plate 422 movably installed in the fixed sleeve 421, two groups of receiving blocks 423 symmetrically arranged on both sides of the telescopic plate 422, one end of the two groups of rotating shafts 424 are respectively rotatably connected to the two groups of receiving blocks 423, an upper end of the telescopic plate 422 is provided with an arc groove 425 for placing the cross bar 502, and two groups of arc bars 102 for supporting the rotating shaft 424 are symmetrically provided at one end of the frame 1, guide grooves 426 are opened on both sides of the fixed sleeve 421, and the receiving blocks 423 are slidably connected to the guide grooves 426.

[0032] Specifically, the telescopic plate 422 is made of magnet material, and the fixed sleeve 421 is made of aluminum alloy. The above-mentioned cross brace 5 falls directly onto the conveyor belt mechanism 4. The falling cross brace 5 will directly hit the conveyor belt of the conveyor belt mechanism 4, and the conveyor belt will be damaged. In the long run, the damage to the conveyor belt will become more and more serious, which will reduce the service life of the conveyor belt. When the cross bar 502 is placed on the support frame 2042, the cross bar 502 is located in the arc groove 425, and the telescopic plate 422 has a certain adsorption force on the cross bar 502. After the cross brace 5 is welded, as the assembly frame 204 makes a circular motion, the rotating shaft 424 will roll along the arc bar 102 until the rotating shaft 424 is staggered. The curved bar 102, at this time the cross brace 5 falls, the cross brace 5 drives the telescopic plate 422 to move downward through the cross bar 502, the telescopic plate 422 drives the receiving block 423 to slide along the guide groove 426, and the rotating shaft 424 moves downward with the receiving block 423 until the telescopic plate 422 can no longer move downward. At this time, the gravity of the cross brace 5 is greater than the adsorption force of the telescopic plate 422, so that the cross bar 502 breaks free from the adsorption of the telescopic plate 422. When the cross brace 5 breaks free from the adsorption of the telescopic plate 422, the descending speed of the cross brace 5 will be significantly reduced, thereby reducing the impact force of the cross brace 5 on the conveyor belt mechanism 4, reducing the damage to the conveyor belt mechanism 4, and improving the service life of the conveyor belt mechanism 4.

[0033] Working principle: Place two sets of vertical rods 501 and a set of horizontal rods 502 on the assembly rack 204 located at the discharge point, so that the two sets of vertical rods 501 and a set of horizontal rods 502 are assembled into a horizontal brace 5, and then a set of transmission shafts 201 are driven by a motor to rotate, and the transmission shafts 201 drive two sets of sprockets 202 to rotate, and the two sets of sprockets 202 drive two sets of chains 203 together with several sets of assembly racks 204 to make circular motions until the assembly rack 204 with the horizontal brace 5 is moved between the two sets of welding mechanisms 3, and then the two sets of cylinders 305 are started, and the cylinders 305 push the receiving plates 304 to make the two sets of laser welding guns 303 move along the corresponding guide rails 302 toward the direction of the horizontal brace 5. , make the end of the laser welding gun 303 close to the welding point position of the cross brace 5, and then weld the cross brace 5 through the laser welding gun 303. During this process, continue to assemble the cross brace 5 on the next group of assembly racks 204. After welding is completed, withdraw the laser welding gun 303, and continue to drive several groups of assembly racks 204 to make circular motions, so that the next group of assembly racks 204 move to the two groups of welding mechanisms 3 for welding. At the same time, as several groups of assembly racks 204 make circular motions, the welded cross brace 5 will move to the bottom of the frame 1. Under the action of gravity, the cross brace 5 will fall onto the conveyor belt mechanism 4, and the conveyor belt mechanism 4 will transport the cross brace 5 away, and then repeat the above operation in a cycle;

[0034] When the assembly frame 204 is located at the discharge point, the six groups of plywood 2047 are in a separated state, and the inner diameter of the area surrounded by the six groups of plywood 2047 is slightly larger than the outer diameter of the vertical rod 501, so that the vertical rod 501 can be easily inserted into the area surrounded by the six groups of plywood 2047, and then the cross bar 502 is placed on the upper end of the support frame 2042, and the position and distance of the end of the cross bar 502 relative to the vertical rod 501 are adjusted to realize the pre-assembly of the cross brace 5. When the assembly frame 204 makes a circular motion, the roller 431 at the lower end of the assembly frame 204 first rolls along the first annular surface 11, and then the roller 431 is squeezed by the inclined surface 12, so that the roller 431 drives the movable plate 2043 together with the two groups of push columns 2044 to move upward, and the movable plate 2043 compresses the spring 2048, at the same time, the push column 2044 drives the two groups of pins 441 to slide along the corresponding spiral groove 451, so that the rotating sleeve 2045 rotates. As the rotating sleeve 2045 rotates, the receiving shaft 462 slides along the oblique groove 452. Under the guidance of the oblique groove 452, the six groups of clamps 2047 are closed and clamp the vertical rod 501 until the roller 431 rolls onto the second annular surface 13, thereby correcting the position of the vertical rod 501 and fixing the cross brace 5. After the cross brace 5 is welded, as the assembly frame 204 makes a circular motion, under the action of the rebound force of the spring 2048, the roller 431 will roll back to the first annular surface 11, and the clamping of the six groups of clamps 2047 on the vertical rod 501 will be released, and the cross brace 5 will automatically fall onto the conveyor belt mechanism 4;

[0035] When the cross bar 502 is placed on the support frame 2042, the cross bar 502 is located in the arc groove 425, and the telescopic plate 422 has a certain adsorption force on the cross bar 502. After the cross brace 5 is welded, as the assembly frame 204 makes a circular motion, the rotating shaft 424 will roll along the arc bar 102 until the rotating shaft 424 staggers the arc bar 102. At this time, the cross brace 5 falls, and the cross brace 5 drives the telescopic plate 422 to move downward through the cross bar 502, and the telescopic plate 422 drives the receiving block 423 to slide along the guide groove 426, and the rotating shaft 424 moves downward with the receiving block 423 until the telescopic plate 422 can no longer move downward. At this time, the gravity of the cross brace 5 is greater than the adsorption force of the telescopic plate 422, causing the cross bar 502 to break free from the adsorption of the telescopic plate 422. Since the cross brace 5 breaks free from the adsorption of the telescopic plate 422, the descending speed of the cross brace 5 will be significantly reduced, thereby reducing the impact force of the cross brace 5 on the conveyor belt mechanism 4.

[0036] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A folding chair cross brace welding device, comprising a frame (1), characterized in that: A transmission mechanism (2) is provided in the frame (1), two sets of welding mechanisms (3) are symmetrically provided on both sides of the frame (1), and a conveyor belt mechanism (4) is provided at the bottom of the frame (1); The transmission mechanism (2) comprises two sets of transmission shafts (201), and the two sets of transmission shafts (201) are rotatably mounted in the frame (1); Two sets of sprockets (202) are symmetrically mounted on the transmission shaft (201); two sets of chains (203), the chains (203) engaging the two sets of sprockets (202); Several groups of assembly frames (204) for assembling cross braces (5) are arranged around the two groups of chains (203), and the cross braces (5) are composed of two groups of vertical rods (501) and one group of cross rods (502); The welding mechanism (3) comprises a fixing plate (301), one end of which is fixedly connected to the frame (1); Two sets of guide rails (302) symmetrically mounted on the fixed plate (301); a laser welding gun (303) slidably connected to the guide rail (302); A connecting plate (304) for connecting two sets of laser welding guns (303); A cylinder (305) fixedly mounted on the fixing plate (301) for driving the receiving plate (304); The assembly rack (204) includes: A base (2041), with two sets of chains (203) fixedly connected to both sides of the base (2041); A support frame (2042) fixedly mounted on the base (2041) for placing the crossbar (502); The support frame (2042) comprises: A fixing sleeve (421), the fixing sleeve (421) being fixedly mounted on the base (2041); a telescopic plate (422) movably mounted in the fixing sleeve (421); Two groups of receiving blocks (423) symmetrically arranged on both sides of the telescopic plate (422); Two groups of rotating shafts (424), one end of each of the two groups of rotating shafts (424) being rotatably connected to the two groups of receiving blocks (423); The upper end of the telescopic plate (422) is provided with an arc groove (425) for placing the cross bar (502), and one end of the frame (1) is symmetrically provided with two groups of arc bars (102) for supporting the rotating shaft (424). Guide grooves (426) are provided on both sides of the fixing sleeve (421), and the receiving block (423) is slidably connected to the guide grooves (426).

2. A folding chair cross brace welding device according to claim 1, characterized in that: A movable plate (2043) movably mounted within the lower end of the base (2041); Two sets of push columns (2044) are fixedly mounted on the movable plate (2043); A rotating sleeve (2045) movably plugged into the pushing column (2044), the rotating sleeve (2045) being rotatably mounted within the base (2041); Six groups of movable blocks (2046) are arranged at equal angles at the upper end of the rotating sleeve (2045); a splint (2047) fixedly connected to the movable block (2046); A spring (2048) is provided between the movable plate (2043) and the inner wall of the base (2041).

3. A folding chair cross brace welding device according to claim 2, characterized in that: The base (2041) is provided with a plurality of rectangular grooves (411), the movable block (2046) is plugged into the guide pillar (461), the guide pillar (461) is fixedly installed in the rectangular groove (411), and the movable block (2046) is slidably connected to the rectangular groove (411).

4. A folding chair cross brace welding device according to claim 3, characterized in that: The upper end surface of the rotating sleeve (2045) is provided with six groups of oblique grooves (452) at equal angles, and the lower end of the movable block (2046) is provided with a receiving shaft (462), and the receiving shaft (462) is located in the oblique grooves (452).

5. A folding chair cross brace welding device according to claim 4, characterized in that: Two groups of spiral grooves (451) are provided on the outer ring of the rotating sleeve (2045), and two groups of pins (441) are provided on the outer ring of the pushing column (2044), and the pins (441) are located in the spiral grooves (451).

6. A folding chair cross brace welding device according to claim 5, characterized in that: A roller (431) is rotatably mounted on the lower end of the movable plate (2043), a guide plate (101) is provided in the frame (1), both ends of the guide plate (101) are rotatably connected to the two sets of transmission shafts (201), and the roller (431) is rollingly connected to the outer ring of the guide plate (101).

7. A folding chair cross brace welding device according to claim 6, characterized in that: The outer ring of the guide plate (101) consists of a first annular surface (11), an inclined surface (12), and a second annular surface (13).

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