Welding equipment for folding chair

Abstract

The invention relates to the technical field of welding equipment, in particular to welding equipment for folding chairs, which comprises a base, a worktable rotationally connected to the working surface of the base through a rotating rod, a welding manipulator arranged on one side surface of the base, and four groups of clamping assemblies uniformly distributed on the worktable, in the using process, the moving distances of the two sets of clamping blocks are the same, so that after the clamping assemblies clamp and fix the same batch of cross beam materials with the same size, the joints of the supporting rods and the fixing rods are located at the same position all the time, that is, the welding positions of the supporting rods and the fixing rods are located at the same position all the time; therefore, the position of the welding manipulator does not need to be adjusted all the time, the welding efficiency is improved, the welding quality consistency is ensured, and the precision and reliability of products are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of welding equipment, and particularly relates to a welding equipment for folding chairs. Background Art

[0002] Folding chairs are light and have a simple structure. When folded, they can save space, and when opened, they can be used as chairs. The stable structure of folding chairs mainly relies on cross braces. The cross braces need to be welded by a welding machine to achieve the stability effect, so as to form a folding chair. Therefore, a welding machine is required to weld the cross braces.

[0003] Traditional welding machines use manual hand-held welding torches to perform welding operations on steel structure cross braces. The operators need to maintain a standing posture throughout the process for repetitive positioning operations, and the daily operation intensity is as high as 8 - 10 hours. In the specific work process, workers need to complete procedures such as positioning and clamping of single workpieces, arc starting and welding, and cooling and taking out in sequence. Each product takes an average of 5 - 8 minutes, and due to the influence of personnel fatigue factors, quality defects such as discontinuous welds and undercut are likely to occur. The main structure of the equipment is only equipped with a fixed welding platform, lacking a rotating workbench that can carry multiple workstations, resulting in an invalid working hour loss of 15% - 20% during the workpiece replacement process. At the same time, for some welding equipment with a rotating workbench, fixed fixtures are mostly used to position the workpieces. When facing cross beam materials of different specifications, it is necessary to repeatedly adjust the fixture spacing and clamping stroke, resulting in time-consuming equipment debugging and difficulty in ensuring the consistency of clamping and positioning of multiple batches of workpieces, seriously affecting the operation efficiency of the welding manipulator; secondly, during the welding process, the rigid clamping of the fixture is likely to cause stress concentration after the workpiece is thermally deformed, and the conventional elastic buffer structure has the problem of premature reset, resulting in micro-displacement during the weld cooling stage, which is extremely likely to cause defects such as welding cracks; furthermore, when the existing clamping mechanism quickly releases the constraint after welding, the sudden release of residual stress in the weld area is likely to cause deformation of the component, lacking buffer control for the release of the welding thermal stress gradient. Summary of the Invention

[0004] In view of the above-mentioned drawbacks of the prior art, the present invention provides a welding equipment for folding chairs, which can effectively solve the problem of low welding efficiency of welding equipment in the prior art.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions:

[0006] The present invention provides a welding device for a folding chair, which includes a base, a workbench rotatably connected to the working surface of the base through a rotating rod, and a welding manipulator arranged on one side surface of the base. It further includes four groups of clamping components evenly distributed on the workbench. The clamping component includes four support frames evenly installed on the workbench. A placing component is arranged in the middle of the top surface of the support frame. A limiting component is arranged near the placing component on the top surface of the support frame. One side surface of the support frame is connected with an auxiliary component for driving the limiting component to work through a frame body;

[0007] Among them, the limiting component includes two groups of support frames symmetrically installed at the edge positions on both sides of the top surface of the support frame. A main extrusion block is rotatably connected to the side surface of the mounting seat near the frame body through a rotating rod. A main extrusion plate is fixedly installed on the side surface of the connecting ring at the end of the main extrusion block. Two groups of clamping blocks are symmetrically and slidably connected to the top surface of the support frame. Mounting blocks are installed on the side surfaces of the two groups of clamping blocks. The end of the main extrusion plate is rotatably connected to the mounting block at the corresponding position through a main connecting plate. A secondary extrusion block is rotatably connected to the end face of the mounting seat far from the frame body through a rotating rod. A secondary extrusion plate is fixedly installed on the side surface of the connecting ring at the end of the secondary extrusion block. The end of the secondary extrusion plate is rotatably connected to the mounting block at the corresponding position through a secondary connecting plate. The lower end of the main extrusion block is connected to the secondary extrusion block through a connecting block.

[0008] Furthermore, a limiting groove is opened in the lower part of the clamping surface of the clamping block. A limiting block is arranged inside the limiting groove. An elastic rubber layer is arranged on the inner side surface of the limiting groove.

[0009] Furthermore, the auxiliary component includes a piston cylinder corresponding to the position of the main extrusion block on the mounting frame body. A magnetic block is elastically slidably connected inside the piston cylinder through a spring. One end face of the magnetic block close to the main extrusion block is fixedly connected with a connecting rod. The end of the connecting rod far from the piston cylinder is connected with the main extrusion block through a slider and a chute. The connecting rod and the slider are connected through a hinge. A one-way air inlet pipe is arranged on the annular inner side surface of the piston cylinder corresponding to the upper part of the frame body. An exhaust pipe is arranged on the annular inner side surface of the piston cylinder corresponding to the lower part of the frame body. A magnetic part is arranged on the top surface of the base corresponding to the position of the welding manipulator. The magnetic part corresponds to the position of one of the magnetic blocks.

[0010] Furthermore, a connecting frame is connected to the lower part of the annular inner side surface of the exhaust pipe. A piston rod is elastically slidably connected to the middle of the top surface of the connecting frame. The lower end of the piston rod penetrates through the connecting frame and extends to the outside of the exhaust pipe and is connected with a sealing cylinder. The sealing cylinder is in contact connection with the exhaust pipe.

[0011] Furthermore, a uniformly distributed number of balls are arranged on the bottom surface of the sealing cylinder.

[0012] Furthermore, a circular plate is provided at the lower portion of the workbench, the base and the circular plate are fixedly connected, the lower end of the exhaust pipe passes through the workbench and extends to a position close to the circular plate, the ball is in contact with the top surface of the circular plate, and an arc-shaped movable groove is provided on the top surface of the circular plate corresponding to the lower portion of the exhaust pipe at a position rotated ninety degrees clockwise along the welding robot, the depth of the arc-shaped movable groove is less than the depth of the sealing cylinder, and evenly distributed adjustment holes are provided on the annular inner surface of the exhaust pipe.

[0013] Furthermore, a circular movable groove is provided on the top surface of the circular plate corresponding to the lower part of the exhaust pipe at a position rotated 180 degrees clockwise along the welding manipulator, and the depth of the circular movable groove is greater than the depth of the sealing cylinder.

[0014] Furthermore, the placement assembly includes a placement plate that is evenly connected to the middle of the top surface of the support frame through threaded rods and nuts, and a placement groove is opened in the middle of the top surface of the placement plate.

[0015] Furthermore, the semicircular inner side surface of the main extrusion block is provided with evenly distributed adsorption holes, and the interior of the placement plate is provided with ventilation grooves, the adsorption holes and the ventilation grooves are interconnected, the ventilation grooves on the two placement plates are interconnected through a bellows, and the side of the ventilation groove on the placement plate near the support frame is connected with a ventilation pipe, and the ventilation pipe extends from one end away from the placement plate to a position near the one-way air inlet pipe and is interconnected with it.

[0016] Furthermore, the inner diameter of the one-way air inlet pipe is larger than the inner diameter of the ventilation pipe.

[0017] Compared with the known prior art, the technical solution provided by the present invention:

[0018] 1. The clamping block drives the limit block and the support rod to move to a position close to the fixed rod until the support rod and the fixed rod are tightly abutted against each other, completing the connection between the support rod and the fixed rod, which is convenient for subsequent welding work. It is worth noting that within the moving path range of the clamping block, the distance that the clamping block moves with the support rod is determined by the length of the fixed rod. Therefore, within the moving path range of the clamping block, the clamping assembly can complete the clamping work of beams of different sizes, thereby facilitating the welding work of beams of different sizes. At the same time, since the two groups of clamping blocks move the same distance, after the clamping assembly completes the clamping and fixing of the same batch of beam materials of the same size, the junction of the support rod and the fixed rod is always in the same position, that is, the welding point of the support rod and the fixed rod is always in the same position, thereby no longer needing to adjust the position of the welding manipulator, thereby improving welding efficiency, ensuring the consistency of welding quality, and improving product precision and reliability.

[0019] 2. The clamping block squeezes and fixes the limiting block through the elastic rubber layer. By controlling factors such as the elastic rubber layer and the movable distance of the sealing cylinder, it is ensured that when the connecting rod makes a slight reset movement, the elastic rubber layer makes an elastic reset movement, but at this time the clamping block will not drive the limiting block to move, and thus will not drive the welded cross beam to move, avoiding the problem of damaging the welded cross beam.

[0020] 3. By setting that after the clamping assembly rotates for a period of time, the elastic rubber layer will make a certain elastic reset movement to reduce the squeezing force on the limiting block, avoiding the problem that the clamping force on the cross beam is cancelled immediately after welding, resulting in cracks or deformation of the weld. By continuously pressing for a certain period of time, the accumulation of thermal stress at the welding place is reduced, further ensuring the welding effect of the cross beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic diagram of the complete structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the clamping assembly of the present invention;

[0024] Figure 3 It is a schematic diagram of the partial structure at the firmware assembly of the present invention;

[0025] Figure 4 It is a schematic diagram of the structure at the clamping block of the present invention;

[0026] Figure 5 It is a schematic diagram of the partial sectional structure at the auxiliary assembly of the present invention;

[0027] Figure 6 It is a schematic diagram of the structure at the connection between the exhaust pipe and the sealing cylinder of the present invention;

[0028] Figure 7 It is a state diagram before and after the sealing cylinder of the present invention moves into the first movable groove;

[0029] Figure 8 It is a state diagram before and after the sealing cylinder of the present invention moves into the second movable groove;

[0030] Figure 9 It is a schematic diagram of the structure at the circular plate of the present invention;

[0031] Figure 10This is a schematic cross-sectional structure diagram of the component placement location of the present invention.

[0032] The reference numerals in the figure respectively represent: 1, base; 2, workbench; 3, welding manipulator; 4, clamping assembly; 40, frame; 41, support frame; 42, limiting assembly; 420, connecting block; 421, mounting seat; 422, main extrusion block; 423, main extrusion plate; 424, main connecting plate; 425, secondary extrusion block; 426, secondary extrusion plate; 427, secondary connecting plate; 428, mounting block; 429, clamping block; 4210, limiting groove; 4211, limiting block; 4212, elastic rubber layer; 43, auxiliary assembly; 431, piston cylinder; 432, connecting rod; 433, magnetic block; 434, spring; 435, one-way intake pipe; 436, exhaust pipe; 437, piston rod; 438, connecting frame; 439, sealing cylinder; 4310, circular plate; 4311, magnetic part; 4312, circular arc moving groove; 4313, circular moving groove; 4314, ball; 4315, adjustment hole; 44, placement assembly; 441, placement plate; 442, placement groove; 443, ventilation groove; 444, adsorption hole; 445, corrugated pipe; 446, ventilation pipe. Detailed implementation manners

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] The present invention will be further described below with reference to the embodiments.

[0035] Embodiment: Refer to Figures 1 to 10 , a welding device for a folding chair, including a base 1, a workbench 2 rotatably connected to the working surface of the base 1 through a rotating rod, and a welding manipulator 3 disposed on one side surface of the base 1. It further includes four groups of clamping assemblies 4 evenly distributed on the workbench 2. The clamping assembly 4 includes four support frames 41 evenly mounted on the workbench 2. A placement assembly 44 is provided in the middle of the top surface of the support frame 41. A limiting assembly 42 is provided near the placement assembly 44 on the top surface of the support frame 41. One side surface of the support frame 41 is connected through a frame 40 with an auxiliary assembly 43 for driving the limiting assembly 42 to work;

[0036] Among them, the limiting component 42 includes two groups of support frames 41 symmetrically installed on both sides of the top surface edge of the support frame 41. The side of the mounting seat 421 near the frame body 40 is rotatably connected to the main extrusion block 422 through a rotating rod. The side of the connecting ring at the end of the main extrusion block 422 is fixedly installed with a main extrusion plate 423. Two groups of clamping blocks 429 are symmetrically and slidably connected to the top surface of the support frame 41. Mounting blocks 428 are installed on the sides of the two groups of clamping blocks 429. The end of the main extrusion plate 423 is rotatably connected to the mounting block 428 at the corresponding position through the main connecting plate 424. The end face of the mounting seat 421 far from the frame body 40 is rotatably connected to the secondary extrusion block 425 through a rotating rod. The side of the connecting ring at the end of the secondary extrusion block 425 is fixedly installed with a secondary extrusion plate 426. The end of the secondary extrusion plate 426 is rotatably connected to the mounting block 428 at the corresponding position through the secondary connecting plate 427. The lower end of the main extrusion block 422 is connected to the secondary extrusion block 425 through a connecting block 420.

[0037] During the use process, the operator places the crossbeam material to be welded on one of the clamping components 4. It should be noted that since the lower part of the workbench 2 is connected to the output end of the motor through a rotating rod, the workbench 2 can rotate under the action of the motor. Therefore, the operator only needs to fix at the corresponding position on the side of the base 1 to place the crossbeam material on multiple groups of clamping components 4.

[0038] The placing component 44 includes placing plates 441 evenly connected to the middle of the top surface of the support frame 41 through threaded rods and nuts. Placing grooves 442 are formed in the middle of the top surface of the placing plates 441.

[0039] Furthermore, the crossbeam is composed of a support rod and a fixing rod. When placing the crossbeam material, the operator can first place the fixing rod in the crossbeam component into the placing groove 442 on the placing plate 441. It should be noted that the number of placing plates 441 can be adjusted according to the number of fixing rods to be welded on the crossbeam, and the placing plates 441 and the support frame 41 are threadedly connected through threaded rods, which is convenient for adjusting the distance between two adjacent placing plates 441, facilitating the adjustment of the distance between two adjacent fixing rods, and thus increasing the comprehensiveness of the welding equipment.

[0040] Refer to Figure 10 , a limiting groove 4210 is formed in the lower part of the clamping surface of the clamping block 429. A limiting block 4211 is arranged inside the limiting groove 4210. An elastic rubber layer 4212 is arranged on the inner side surface of the limiting groove 4210. It should be noted that the limiting block 4211 is composed of a straight groove and two vertical grooves penetrating through the clamping block 429. When placing the limiting block 4211, first overcome the elasticity of the elastic rubber layer 4212 and place the limiting block 4211 into the straight groove. When the two ends of the limiting block 4211 correspond to the vertical grooves, move the limiting block 4211 downward to complete the placement of the limiting block 4211.

[0041] Furthermore, the limiting block 4211 is located at the lower part of the clamping block 429 to avoid the problem of blocking the welding part. The limiting block 4211 is composed of a sliding part and a limiting ring. Among them, the inner diameter of the limiting ring can be adjusted according to the size of the crossbeam support rods to be welded in each batch to ensure the limiting effect of the limiting ring. After the above reference is completed, the operator can vertically place the support rod to be welded into the inside of the limiting ring. Since the inner diameter of the limiting ring corresponds to the size of the support rod and there is a certain distance between the limiting ring and the working surface of the support frame 41, when the support rod is placed inside the limiting ring, under the action of the limiting ring, the support rod will be in a vertical state to facilitate the subsequent welding work;

[0042] Furthermore, after the crossbeam material on one set of clamping components 4 is placed, the servo motor drives the workbench 2 and the clamping components 4 with the crossbeam material placed thereon to rotate until it is in the position corresponding to the welding manipulator 3, and then the motor is turned off. The servo motor is a motor used to precisely control position, speed, and acceleration to ensure the accuracy of the operation. This is a conventional technical means in the prior art, so it will not be elaborated here. When the clamping component 4 with the crossbeam is in the corresponding position with the welding manipulator 3, the welding manipulator 3 completes the welding work between the fixed rod and the support rod. It should be noted that during the welding process of the welding manipulator 3, the operator can place the crossbeam material on the other set of clamping components 4 to ensure the continuity and efficiency of the welding work. After welding, the servo motor drives the workbench 2 and the next set of clamping components 4 with the crossbeam material placed thereon to rotate until it is in the position corresponding to the welding manipulator 3, and then repeat the above operation. It should be noted that some operators can perform the material taking work on the welded crossbeam to further improve the efficiency of the welding work.

[0043] Refer to Figures 2 to 9 , the auxiliary component 43 includes a piston cylinder 431 corresponding to the position of the main extrusion block 422 on the mounting frame 40. A magnetic block 433 is elastically slidably connected inside the piston cylinder 431 through a spring 434. The end face of the magnetic block 433 close to the main extrusion block 422 is fixedly connected with a connecting rod 432. The end of the connecting rod 432 away from the piston cylinder 431 is connected to the main extrusion block 422 through a slider and a chute. The connecting rod 432 is connected to the slider through a hinge. A one-way intake pipe 435 is provided on the annular inner side of the piston cylinder 431 corresponding to the upper part of the frame 40, and an exhaust pipe 436 is provided on the annular inner side of the piston cylinder 431 corresponding to the lower part of the frame 40. A magnetic member 4311 is provided on the top surface of the base 1 corresponding to the position of the welding manipulator 3, and the magnetic member 4311 corresponds to the position of one of the magnetic blocks 433.

[0044] Further, when welding rods are to be applied to the cross beam on one set of clamping components 4, the auxiliary component 43 drives the limiting component 42 to rotate clockwise around the mounting base 421. During this process, the main pressing block 422 drives the main pressing plate 423 to rotate clockwise. At the same time, the lower end of the main pressing block 422 drives the connecting block 420 to gradually move in the direction of the upper left. The connecting block 420 drives the secondary pressing block 425 and the secondary pressing plate 426 to rotate clockwise around the mounting base 421. When the main pressing plate 423 rotates, it presses the corresponding mounting block 428 through the main connecting plate 424 to move it in the direction closer to the middle of the support frame 41. When the secondary pressing plate 426 rotates, it presses the corresponding mounting block 428 through the secondary connecting plate 427 to move it in the direction closer to the middle of the support frame 41. It should be noted that the main connecting plate 424 and the secondary connecting plate 427 have the same size specifications, and the included angle between the main pressing plate 423 and the main connecting plate 424, and between the secondary pressing plate 426 and the secondary connecting plate 427 in the initial state is the same. Therefore, the offset distances of the secondary pressing plate 426 and the main connecting plate 424 are the same, that is, the moving distances of the two sets of mounting blocks 428 are the same, and further the moving distances of the two sets of clamping blocks 429 are the same.

[0045] Further, the clamping block 429 drives the limiting block 4211 and the support rod to move towards the position closer to the fixed rod until the support rod and the fixed rod are in contact and pressed tightly, completing the docking work between the support rod and the fixed rod to facilitate the subsequent welding work. It should be noted that within the moving path range of the clamping block 429, the moving distance of the clamping block 429 with the support rod depends on the length of the fixed rod. Further, within the moving path range of the clamping block 429, the clamping component 4 can complete the clamping work on cross beams of different sizes, and thus facilitate the welding work on cross beams of different sizes.

[0046] Further, since the moving distances of the two sets of clamping blocks 429 are the same, after the clamping component 4 clamps and fixes the same batch of cross beam materials with the same size, the connection point between the support rod and the fixed rod is always in the same position, that is, the welding point between the support rod and the fixed rod is always in the same position. Therefore, it is not necessary to continuously adjust the position of the welding manipulator 3, improving the welding efficiency, ensuring the consistency of the welding quality, and improving the accuracy and reliability of the product.

[0047] It should be noted that when one of the clamping assemblies 4 moves to the position corresponding to the clamping assembly 4, the magnetic member 4311 corresponds to the magnetic block 433 in position, and the magnetic properties of the surfaces of the magnetic member 4311 and the magnetic block 433 that are close to each other are the same. When the magnetic member 4311 corresponds to the magnetic block 433 in position, a repulsive force is generated between the magnetic member 4311 and the magnetic block 433. The repulsive force causes the magnetic block 433 to drive the connecting rod 432 to move in the direction close to the main extrusion block 422 against the elastic force of the spring 434 and gradually extrude it. Since one end of the connecting rod 432 away from the piston cylinder 431 is connected to the main extrusion block 422 through a slider and a chute, and the connecting rod 432 and the slider are connected by a hinge, during the movement of the connecting rod 432, the main extrusion block 422 will be gradually driven to rotate. This is a conventional technical means in the prior art, so it will not be elaborated here. It should be noted that the spring 434 is made of non-magnetic material, and the magnetic member 4311 can be an electromagnet. An electromagnet is a device that generates a magnetic field through the action of an electric current, which facilitates controlling the magnitude of the repulsive force between the magnetic member 4311 and the main extrusion block 422 according to requirements. It should be noted that the method of driving the connecting rod 432 to move through the repulsive force between the magnetic member 4311 and the main extrusion block 422 can also be replaced by an electric telescopic rod or the like, which facilitates completing the welding work of the folding chair crossbeam according to requirements.

[0048] Uniformly distributed adsorption holes 444 are formed on the semi-circular inner side surfaces of the main extrusion blocks 422. Ventilation grooves 443 are formed inside the placement plates 441. The adsorption holes 444 and the ventilation grooves 443 are connected in communication. The ventilation grooves 443 on the two placement plates 441 are connected in communication through a corrugated pipe 445. A ventilation pipe 446 is connected to the side surface of the ventilation groove 443 on the placement plate 441 close to the support frame 41. One end of the ventilation pipe 446 away from the placement plate 441 extends to a position close to the one-way intake pipe 435 and is connected to it in communication. The material property of the corrugated pipe 445 has a certain ductility, which facilitates the adjustment of the distance between the two placement plates 441.

[0049] It should be noted that during the movement of the magnetic block 433, external gas enters the inside of the piston cylinder 431 through the one-way intake pipe 435 to ensure the normal progress of the movement of the magnetic block 433. The one-way intake pipe 435 is composed of a pipe and a one-way valve. Further, during the process of the gas inside the one-way intake pipe 435 entering the inside of the piston cylinder 431, the gas inside the ventilation groove 443 will also enter the inside of the one-way intake pipe 435 through the ventilation pipe 446. During this process, external gas enters the inside of the ventilation groove 443 through the adsorption holes 444, and a negative pressure adsorption force is generated at the opening of the ventilation groove 443, thereby pre-fixing the fixing rod and ensuring the docking effect between the fixing rod and the support rod.

[0050] Refer to Figures 6 to 8, a connecting frame 438 is connected to the lower part of the annular inner side surface of the exhaust pipe 436. The middle part of the top surface of the connecting frame 438 is elastically and slidably connected with a piston rod 437. The lower end of the piston rod 437 penetrates through the connecting frame 438 and extends to the outside of the exhaust pipe 436 and is connected with a sealing cylinder 439. The sealing cylinder 439 is in contact connection with the exhaust pipe 436.

[0051] Refer to Figure 7 , a circular plate 4310 is provided at the lower part of the workbench 2. The base 1 is fixedly connected with the circular plate 4310. The lower end of the exhaust pipe 436 penetrates through the workbench 2 and extends to a position close to the circular plate 4310. The ball 4314 is in contact with the top surface of the circular plate 4310. An arc-shaped movable groove 4312 is formed in the lower part of the exhaust pipe 436 corresponding to the position where the welding manipulator 3 rotates 90 degrees clockwise along the circular plate 4310. Adjusting holes 4315 are evenly distributed on the annular inner surface of the exhaust pipe 436.

[0052] Further, after the welding work on the crossbeam of one set of clamping components 4 is completed, the workbench 2 is rotated by 90 degrees by the motor. When the workbench 2 rotates, the repulsive force between the magnetic block 433 and the magnetic member 4311 of this set of clamping components 4 gradually disappears. Since the ball 4314 is in contact with the top surface of the circular plate 4310, the sealing cylinder 439 cannot move, and the gas inside the piston cylinder 431 cannot be discharged normally. Under the elastic force of the spring 434 restoring its elastic deformation, the magnetic block 433 has a tendency to move towards the frame 40. After the above work is completed, when the position of the sealing cylinder 439 of this set of clamping components 4 corresponds to the arc-shaped movable groove 4312, under the elastic force of the spring 434 restoring its elastic deformation, the gas inside the piston cylinder 431 enters the inside of the exhaust pipe 436 to squeeze the sealing cylinder 439. The squeezing force causes the sealing cylinder 439 to move towards the inner top surface of the arc-shaped movable groove 4312 against the elastic force between it and the connecting frame 438 until the ball 4314 is in contact with the top surface of the circular plate 4310. At this time, part of the gas inside the piston cylinder 431 enters the cavity formed after the sealing cylinder 439 moves, and the connecting rod 432 undergoes a slight reset movement. Since the clamping block 429 fixes the limiting block 4211 by squeezing through the elastic rubber layer 4212, by controlling factors such as the elastic rubber layer 4212 and the movable distance of the sealing cylinder 439, it is ensured that when the connecting rod 432 undergoes a slight reset movement, the elastic rubber layer 4212 undergoes an elastic reset movement, but at this time the clamping block 429 will not drive the limiting block 4211 to move. This is a conventional technical means in the prior art and will not be elaborated here. Furthermore, it will not drive the welded crossbeam to move, avoiding the problem of damaging the welded crossbeam. At the same time, by controlling the elastic reset movement of the elastic rubber layer 4212, it is ensured that the operator can easily move the limiting block 4211 upward and then horizontally, and then take out the welded crossbeam, ensuring the continuity of the welding work.

[0053] It should be noted that by setting this set of clamping components 4 to rotate for a period of time, the elastic rubber layer 4212 will undergo a certain elastic reset movement to reduce the squeezing force on the limiting block 4211, avoiding the problem that the clamping force on the crossbeam is immediately cancelled after welding is completed, resulting in cracks or deformation of the weld seam. By continuously pressing for a certain period of time, the accumulation of thermal stress at the welding point is reduced, further ensuring the welding effect on the crossbeam.

[0054] Refer to Figure 8 , a circular movable groove 4313 is provided at the lower part of the exhaust pipe 436 corresponding to the position where the top surface of the circular plate 4310 rotates 180 degrees clockwise along the welding manipulator 3.

[0055] It should be noted that as the welding work progresses, when the clamping assembly 4 rotates to the position corresponding to the circular movable groove 4313, since the depth of the arc-shaped movable groove 4312 is less than the depth of the sealing cylinder 439 and the depth of the circular movable groove 4313 is greater than the depth of the sealing cylinder 439, the sealing cylinder 439 continues to move downward under the elastic force of the spring 434 restoring its elastic deformation. A gap is formed between the sealing cylinder 439 and the circular plate 4310, and the gas inside the piston cylinder 431 is discharged through the gap. The magnetic block 433 gradually resets, facilitating the next clamping and fixing work.

[0056] It should be noted that by providing the adjustment hole 4315, the gas inside the exhaust pipe 436 will also be discharged through the adjustment hole 4315. By controlling its inner diameter, during the rotation of the clamping assembly 4, the amount of gas discharged through the adjustment hole 4315 is not sufficient to cause obvious movement of the magnetic block 433. However, when the clamping assembly 4 rotates to the position of the adjustment hole 4315, since the cross beam on one of the clamping assemblies 4 is performing welding work at this time, at this time, the gas that cannot be discharged between the sealing cylinder 439 and the circular plate 4310 gradually discharges through the adjustment hole 4315, ensuring that under the elastic force of the connection between the piston rod 437 and the connecting frame 438 restoring their elastic deformation, the sealing cylinder 439 can be in a tightly pressed state with the ball 4314 again, facilitating the next work.

[0057] Refer to Figure 6 , the bottom surface of the sealing cylinder 439 is provided with uniformly distributed balls 4314, which converts the sliding friction between the sealing cylinder 439 and the circular plate 4310 into rolling friction, reducing the wear degree between the sealing cylinder 439 and the circular plate 4310.

[0058] Refer to Figure 5 , the inner diameter of the one-way intake pipe 435 is greater than the inner diameter of the vent pipe 446, controlling the gas entering the one-way intake pipe 435 from the vent pipe 446 per unit time, avoiding the problem that the negative pressure adsorption force generated at the adsorption hole 444 is too large, making it difficult for the fixing rod to move under the extrusion force of the clamping block 429 and the support rod. At the same time, when the magnetic block 433 stops moving, that is, when the docking work of the fixing rod and the support rod is completed, the outside gas gradually enters the inside of the vent pipe 446, canceling the generated negative pressure adsorption force, facilitating the subsequent material taking work.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A welding device for a folding chair, comprising a base (1), a workbench (2) rotatably connected to the base (1) via a rotating rod, characterized in that: Also includes: Four groups of clamping assemblies (4) are evenly distributed on the workbench (2), the clamping assemblies (4) comprising four support frames (41) evenly mounted on the workbench (2), the support frames (41) being provided with limit assemblies (42), and the side surfaces of the support frames (41) being connected to auxiliary assemblies (43) for driving the limit assemblies (42) to work through a frame body (40); The limiting assembly (42) comprises two groups of support frames (41) symmetrically mounted on the edge positions of both sides of the top surface of the support frame (41); a main extrusion block (422) is rotatably connected to the side of the mounting seat (421) close to the frame body (40); a main extrusion plate (423) is fixedly mounted on the annular side of the main extrusion block (422); two groups of clamping blocks (429) are symmetrically slidably connected to the top surface of the support frame (41); the sides of the two groups of clamping blocks (429) are provided with mounting blocks (428); the main extrusion plate (423) The end of the main extrusion block (422) is rotatably connected to the mounting block (428) at the corresponding position through the main connecting plate (424); the end surface of the mounting seat (421) at the position away from the frame (40) is rotatably connected to the secondary extrusion block (425); the annular side surface of the secondary extrusion block (425) is installed with a secondary extrusion plate (426); the end of the secondary extrusion plate (426) is rotatably connected to the mounting block (428) at the corresponding position through the secondary connecting plate (427); the lower end of the main extrusion block (422) is connected to the secondary extrusion block (425) through the connecting block (420).

2. A welding device for a folding chair according to claim 1, characterized in that: A limiting groove (4210) is provided at the lower part of the clamping surface of the clamping block (429), a limiting block (4211) is provided inside the limiting groove (4210), and an elastic rubber layer (4212) is provided on the inner side surface of the limiting groove (4210).

3. A welding device for a folding chair according to claim 2, characterized in that: The auxiliary component (43) comprises a piston cylinder (431) on the mounting frame (40) corresponding to the position of the main extrusion block (422); the interior of the piston cylinder (431) is elastically slidably connected to a magnetic block (433) via a spring (434); the end surface of the magnetic block (433) close to the main extrusion block (422) is fixedly connected to a connecting rod (432); the end of the connecting rod (432) away from the piston cylinder (431) is connected to the main extrusion block (422) via a slider and a slide groove; The connecting rod (432) is connected to the slider via a hinge; a one-way air inlet pipe (435) is provided on the annular inner side surface of the piston cylinder (431) at a position corresponding to the upper part of the frame (40); an exhaust pipe (436) is provided on the annular inner side surface of the piston cylinder (431) at a position corresponding to the lower part of the frame (40); a magnetic part (4311) is provided on the top surface of the base (1) at a position corresponding to the welding robot (3); and the magnetic part (4311) corresponds to the position of one of the magnetic blocks (433).

4. A welding device for a folding chair according to claim 3, characterized in that: A connecting frame (438) is connected to the lower portion of the annular inner side surface of the exhaust pipe (436); a piston rod (437) is elastically slidably connected to the middle portion of the top surface of the connecting frame (438); the lower end of the piston rod (437) passes through the connecting frame (438) and extends to the outside of the exhaust pipe (436) and is connected to a sealing cylinder (439); the sealing cylinder (439) is in abutting connection with the exhaust pipe (436).

5. A welding device for a folding chair according to claim 4, characterized in that: The bottom surface of the sealing cylinder (439) is provided with evenly distributed balls (4314).

6. A welding device for a folding chair according to claim 5, characterized in that: The top surface of the base (1) is connected to a circular plate (4310) near the lower end of the workbench (2), the lower end of the exhaust pipe (436) passes through the workbench (2) and extends to a position close to the circular plate (4310), the ball (4314) is in contact with the top surface of the circular plate (4310), and the top surface of the circular plate (4310) corresponds to the lower part of the exhaust pipe (436) rotated ninety degrees clockwise along the welding robot (3) and is provided with an arc-shaped movable groove (4312), the depth of the arc-shaped movable groove (4312) is less than the depth of the sealing cylinder (439), and the annular inner surface of the exhaust pipe (436) is provided with evenly distributed adjustment holes (4315).

7. A welding device for a folding chair according to claim 6, characterized in that: A circular movable groove (4313) is provided on the top surface of the circular plate (4310) corresponding to the lower part of the exhaust pipe (436) at a position rotated 180 degrees clockwise along the welding robot (3), and the depth of the circular movable groove (4313) is greater than the depth of the sealing cylinder (439).

8. The welding device for a folding chair according to claim 7, characterized in that: The support frame (41) is provided with a placement assembly (44), and the placement assembly (44) comprises a placement plate (441) evenly connected to the middle of the top surface of the support frame (41) through a threaded rod and a nut, and a placement groove (442) is opened in the middle of the top surface of the placement plate (441).

9. A welding device for a folding chair according to claim 8, characterized in that: The semicircular inner side surface of the main extrusion block (422) is provided with uniformly distributed adsorption holes (444), and the interior of the placement plate (441) is provided with ventilation grooves (443). The adsorption holes (444) are interconnected with the ventilation grooves (443), and the ventilation grooves (443) on the two placement plates (441) are interconnected through a bellows (445). The side of the ventilation groove (443) on the placement plate (441) near the support frame (41) is connected with a ventilation pipe (446), and the ventilation pipe (446) extends from one end of the placement plate (441) to a position near the one-way air inlet pipe (435) and is interconnected with it.

10. A welding device for a folding chair according to claim 9, characterized in that: The inner diameter of the one-way air inlet pipe (435) is greater than the inner diameter of the vent pipe (446).

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