Welding equipment for folding chairs

Abstract

The present invention relates to the technical field of welding equipment, and specifically to a welding equipment for folding chairs, comprising a base, a workbench rotatably connected to a working surface of the base by a rotating rod, and a welding manipulator arranged on one side surface of the base. The equipment also includes four groups of clamping assemblies evenly distributed on the workbench. During use of the present invention, the two groups of clamping blocks move the same distance, so after the clamping assemblies complete clamping and fixing of the same batch of beam materials of the same size, the intersection 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, and thus there is no need to constantly adjust the position of the welding manipulator, thereby improving welding efficiency, ensuring consistency of welding quality, and improving product precision and reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of welding equipment, in particular to a welding equipment for a folding chair. Background Art

[0002] The folding chair is light and simple in structure. It can save space when folded and can be used as a chair when opened. The stable structure of the folding chair mainly depends on the cross brace. The formation of the cross brace requires welding work by a welding machine to make the cross brace play a stabilizing role, thus forming a folding chair. Therefore, a welding machine is needed to weld the cross brace.

[0003] Traditional welding machines use a handheld torch to weld steel structure cross braces. Operators must remain standing throughout the process, performing repetitive positioning operations, with a daily workload of up to 8-10 hours. Workers must sequentially complete the workpiece positioning and clamping, arc welding, cooling, and removal, taking an average of 5-8 minutes per piece. This process is also prone to fatigue, leading to quality defects such as weld discontinuities and undercuts. The main structure of the equipment is only equipped with a fixed welding platform and lacks a rotary worktable that can carry multiple workstations, resulting in 15% to 20% invalid working time loss during the workpiece replacement process. At the same time, some welding equipment with a rotary worktable mostly uses fixed fixtures to position the workpiece. When facing beam materials of different specifications, it is necessary to repeatedly adjust the fixture spacing and clamping stroke, which makes the equipment debugging time-consuming and difficult to ensure the consistency of clamping and positioning of multiple batches of workpieces, seriously affecting the operating efficiency of the welding manipulator; secondly, the rigid clamping of the fixture during welding can easily cause stress concentration after thermal deformation of the workpiece, and the conventional elastic buffer structure has the problem of premature reset, resulting in micro-displacement in the weld cooling stage, which can easily cause defects such as welding cracks; thirdly, when the existing clamping mechanism is quickly released after welding is completed, the sudden release of residual stress in the weld area can easily cause component deformation, and there is a lack of buffering control for the release of welding thermal stress gradients. Summary of the Invention

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

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

[0006] The present invention provides a welding device for a folding chair, comprising a base, a workbench rotatably connected to a working surface of the base via a rotating rod, and a welding manipulator disposed on one side surface of the base. The device also comprises four groups of clamping assemblies evenly distributed on the workbench, wherein the clamping assemblies include four support frames evenly mounted on the workbench, a placement assembly being provided in the middle of the top surface of the support frame, a limit assembly being provided on the top surface of the support frame near the placement assembly, and an auxiliary assembly for driving the limit assembly to operate being connected to one side surface of the support frame via a frame body.

[0007] The locking plate is fixedly mounted on the support frame, and the locking plate is fixedly mounted on the support frame to lock the support frame.

[0008] Furthermore, a limiting groove is provided at the lower portion of the clamping surface of the clamping block, a limiting block is provided inside the limiting groove, and an elastic rubber layer is provided on the inner side surface of the limiting groove.

[0009] Furthermore, the auxiliary component includes a piston cylinder installed on the frame body corresponding to the position of the main extrusion block, the interior of the piston cylinder is elastically slidably connected to a magnetic block through a spring, the end face of the magnetic block close to the main extrusion block is fixedly connected to a connecting rod, the end of the connecting rod away from the piston cylinder is connected to the main extrusion block through a slider and a slide groove, the connecting rod and the slider are connected by a hinge, the annular inner surface of the piston cylinder is provided with a one-way air inlet pipe at a position corresponding to the upper part of the frame body, the annular inner surface of the piston cylinder is provided with an exhaust pipe at a position corresponding to the lower part of the frame body, the top surface of the base is provided with a magnetic part at a position corresponding to the welding robot, and 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, and a piston rod is elastically and slidably connected to the middle part of the top surface of the connecting frame. The lower end of the piston rod passes through the connecting frame and extends to the outside of the exhaust pipe and is connected to a sealing cylinder. The sealing cylinder is in a contact connection with the exhaust pipe.

[0011] Furthermore, the bottom surface of the sealing cylinder is provided with evenly distributed balls.

[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 portion of the exhaust pipe at a position rotated 180 degrees clockwise along the welding robot, 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 provided 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 communicated with each other, the ventilation grooves on the two placement plates are communicated with each other through a bellows, and the side of the ventilation groove on the placement plate near the support frame position is connected with a ventilation pipe, and the ventilation pipe extends from one end of the placement plate to a position near the one-way air inlet pipe and is communicated 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 toward 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 and facilitating 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. Thus, within the moving path range of the clamping block, the clamping assembly can complete the clamping work of beams of different sizes, thereby facilitating welding of beams of different sizes. At the same time, since the two sets 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 eliminating the need to constantly adjust the position of the welding robot, thereby improving welding efficiency, ensuring consistency in welding quality, and improving product precision and reliability.

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

[0020] 3. By setting the clamping assembly to rotate for a period of time, the elastic rubber layer will undergo a certain elastic reset movement to reduce the extrusion force on the limit block, avoiding the problem of canceling the clamping force on the beam immediately after welding is completed, which will cause cracks or deformation in the weld. 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 of the beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

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

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

[0024] Figure 3 It is a schematic diagram of the local structure of the firmware component of the present invention;

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

[0026] Figure 5 It is a partial cross-sectional structural schematic diagram of the auxiliary component of the present invention;

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

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

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

[0030] Figure 9 This is a schematic structural diagram of the circular plate of the present invention;

[0031] Figure 10This is a schematic cross-sectional view of the structure where the components of the present invention are placed.

[0032] The numbers in the figure represent: 1. base; 2. workbench; 3. welding manipulator; 4. clamping assembly; 40. frame; 41. support frame; 42. limit 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. limit groove; 4211. limit block; 4212. elastic rubber layer; 43. auxiliary assembly; 431 , piston cylinder; 432, connecting rod; 433, magnetic block; 434, spring; 435, one-way air inlet pipe; 436, exhaust pipe; 437, piston rod; 438, connecting frame; 439, sealing cylinder; 4310, circular plate; 4311, magnetic part; 4312, arc-shaped movable groove; 4313, circular movable groove; 4314, ball; 4315, adjustment hole; 44, placement component; 441, placement plate; 442, placement groove; 443, ventilation groove; 444, adsorption hole; 445, bellows; 446, ventilation pipe. DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

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

[0035] Example: Refer to Figures 1 to 10 A welding device for a folding chair includes a base 1, a workbench 2 rotatably connected to the working surface of the base 1 by a rotating rod, and a welding robot 3 arranged on one side of the base 1. The device also 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 limit assembly 42 is provided on the top surface of the support frame 41 near the placement assembly 44. An auxiliary assembly 43 for driving the limit assembly 42 is connected to one side of the support frame 41 through a frame body 40.

[0036] Among them, the limiting assembly 42 includes two groups of mounting seats 421 symmetrically installed on the edge positions of both sides of the top surface of the support frame 41, the side of the mounting seat 421 close to the frame body 40 is rotatably connected to the main extrusion block 422 through a rotating rod, and the side of the connecting ring at the end of the main extrusion block 422 is fixedly installed with a main extrusion plate 423, the top surface of the support frame 41 is symmetrically and slidingly connected with two groups of clamping blocks 429, and the sides of the two groups of clamping blocks 429 are installed with mounting blocks 428, the ends of the main extrusion plate 423 are rotatably connected to the mounting blocks 428 at the corresponding positions through the main connecting plate 424, and the end surface of the mounting seat 421 away from the frame body 40 is rotatably connected to the secondary extrusion block 425 through a rotating rod, and the secondary extrusion plate 426 is fixedly installed on the side of the connecting ring at the end of the secondary extrusion block 425, and 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, and the lower end of the main extrusion block 422 is connected to the secondary extrusion block 425 through the connecting block 420.

[0037] During use, the operator places the beam material to be welded on one of the clamping components 4. It is worth noting 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, so the operator only needs to fix the corresponding position on the side of the base 1 to place the beam material on multiple groups of clamping components 4.

[0038] The placement assembly 44 includes a placement plate 441 that is evenly connected to the middle of the top surface of the support frame 41 through threaded rods and nuts. A placement groove 442 is opened in the middle of the top surface of the placement plate 441.

[0039] Furthermore, the beam is composed of a support rod and a fixed rod. When placing the beam material, the operator can first place the fixed rod in the beam component inside the placement groove 442 on the placement plate 441. It is worth noting that the number of placement plates 441 can be adjusted according to the number of fixed rods that need to be welded to the beam, and the placement plates 441 and the support frame 41 are connected by threaded rods and threads, which facilitates the adjustment of the distance between the two placement plates 441 and the distance between the two fixed rods, thereby increasing the comprehensiveness of the welding equipment.

[0040] Reference Figure 10 A limiting groove 4210 is provided at the lower part of the clamping surface of the clamping block 429, and a limiting block 4211 is provided inside the limiting groove 4210. The inner side of the limiting groove 4210 is provided with an elastic rubber layer 4212. It is worth noting that the limiting block 4211 consists of a straight groove and two vertical grooves that are arranged through the clamping block 429. When placing the limiting block 4211, the limiting block 4211 is first placed into the straight groove to overcome the elasticity of the elastic rubber layer 4212. When the two ends of the limiting block 4211 correspond to the positions of the vertical grooves, the limiting block 4211 is moved downward to complete the placement of the limiting block 4211.

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

[0042] Furthermore, when the placement of the beam material on one group of clamping assemblies 4 is completed, the workbench 2 and the clamping assembly 4 with the beam material placed thereon are driven by a servo motor to rotate until they are in a position corresponding to the welding robot 3, and the motor is turned off. The servo motor is an electric 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 assembly 4 with the beam is placed corresponds to the position of the welding robot 3, the welding robot 3 completes the welding work between the fixed rod and the support rod. It is worth noting that during the welding process of the welding robot 3, the operator can place the beam material on another group of clamping assemblies 4 to ensure the continuity and efficiency of the welding work. After the welding is completed, the workbench 2 and the next group of clamping assemblies 4 with the beam material placed thereon are driven by a servo motor to rotate until they are in a position corresponding to the welding robot 3, and the above operation is repeated. It is worth noting that some operators can take the material from the welded beam, further improving the efficiency of the welding work.

[0043] Reference Figures 2 to 9 The auxiliary component 43 includes a piston cylinder 431 installed on the frame 40 corresponding to the position of the main extrusion block 422. The interior of the piston cylinder 431 is elastically slidably connected to the magnetic block 433 through a spring 434. The end face of the magnetic block 433 close to the main extrusion block 422 is fixedly connected to the 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 slide groove. The connecting rod 432 and the slider are connected by a hinge. The annular inner surface of the piston cylinder 431 is provided with a one-way air inlet pipe 435 at a position corresponding to the upper part of the frame 40, and the annular inner surface of the piston cylinder 431 is provided with an exhaust pipe 436 at a position corresponding to the lower part of the frame 40. The top surface of the base 1 is provided with a magnetic part 4311 at a position corresponding to the welding robot 3. The magnetic part 4311 corresponds to the position of one of the magnetic blocks 433.

[0044] Furthermore, when it is necessary to weld a rod to the crossbeam on one of the groups of clamping assemblies 4, the auxiliary assembly 43 drives the limiting assembly 42 to rotate clockwise around the mounting seat 421. During this process, the main extrusion block 422 drives the main extrusion plate 423 to rotate clockwise. At the same time, the lower end of the main extrusion block 422 drives the connecting block 420 to gradually move toward the upper left direction. The connecting block 420 drives the secondary extrusion block 425 and the secondary extrusion plate 426 to rotate clockwise around the mounting seat 421. When the main extrusion plate 423 rotates, it squeezes its corresponding mounting block 428 through the main connecting plate 424 to move it closer to the support frame 41. The secondary extrusion plate 426 rotates through the secondary connecting plate 427 to squeeze the corresponding mounting block 428 so that it moves toward the middle of the support frame 41. It is worth noting that the main connecting plate 424 and the secondary connecting plate 427 have the same size specifications, and the angles between the main extrusion plate 423 and the main connecting plate 424, and the secondary extrusion plate 426 and the secondary connecting plate 427 are the same in the initial state. Therefore, the offset distances of the secondary extrusion plate 426 and the main connecting plate 424 are the same, that is, the two groups of mounting blocks 428 move the same distance, and thus the two groups of clamping blocks 429 move the same distance.

[0045] Furthermore, the clamping block 429 drives the limit block 4211 and the support rod to move toward a position close to the fixed rod until the support rod and the fixed rod are tightly abutted against each other, completing the docking work between the support rod and the fixed rod to facilitate subsequent welding work. It is worth noting that within the moving path range of the clamping block 429, the distance that the clamping block 429 moves with the support rod is determined by the length of the fixed rod. Furthermore, within the moving path range of the clamping block 429, the clamping assembly 4 can complete the clamping work of beams of different sizes, thereby facilitating the welding work of beams of different sizes.

[0046] Furthermore, since the two groups of clamping blocks 429 move the same distance, after the clamping assembly 4 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, and there is no need to constantly adjust the position of the welding robot 3, thereby improving welding efficiency, ensuring consistency in welding quality, and improving product accuracy and reliability.

[0047] It is worth noting that when one of the clamping components 4 moves to the position of the corresponding clamping component 4, the position of the magnetic piece 4311 corresponds to the position of the magnetic block 433, and the magnetism of the close surface of the magnetic piece 4311 and the magnetic block 433 is the same. When the position of the magnetic piece 4311 corresponds to the position of the magnetic block 433, a repulsive force is generated between the magnetic piece 4311 and the magnetic block 433. The repulsive force causes the magnetic block 433 to drive the connecting rod 432 to overcome the elastic force of the spring 434 and move toward the direction close to the main extrusion block 422, and gradually squeeze it. Since the end of the connecting rod 432 away from the piston cylinder 431 is connected to the main extrusion block 422 through the slider and the slide groove, the connecting rod 432 and the slider are connected. It is connected by a hinge, so during the movement of the connecting rod 432, the main extrusion block 422 will gradually rotate. This is a conventional technical means in the prior art, so it will not be described here. It is worth noting that the spring 434 is made of non-magnetic material, and the magnetic part 4311 can be an electromagnet. An electromagnet is a device that generates a magnetic field through the action of electric current, which makes it convenient to control the size of the repulsive force between the magnetic part 4311 and the main extrusion block 422 as needed. It is worth noting that the method of driving the connecting rod 432 to move by the repulsive force between the magnetic part 4311 and the main extrusion block 422 can also be replaced by an electric telescopic rod, etc., which makes it convenient to complete the welding work of the folding chair beam as needed.

[0048] The semicircular inner side surface of the main extrusion block 422 is provided with evenly distributed adsorption holes 444, and the interior of the placement plate 441 is provided with ventilation grooves 443. The adsorption holes 444 and the ventilation grooves 443 are communicated with each other, and the ventilation grooves 443 on the two placement plates 441 are communicated with each other through 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. 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 communicated with it. The material property of the bellows 445 has a certain ductility, which is convenient for adjusting the distance between the two placement plates 441.

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

[0050] Reference Figures 6 to 8The lower part of the annular inner side surface of the exhaust pipe 436 is connected to a connecting frame 438, and the middle part of the top surface of the connecting frame 438 is elastically and slidingly connected to a piston rod 437. 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 and the exhaust pipe 436 are in a contact connection.

[0051] Reference Figure 7 A circular plate 4310 is provided at the lower part of the workbench 2, and the base 1 is fixedly connected to the circular plate 4310. 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. 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. An arc-shaped movable groove 4312 is provided, and evenly distributed adjustment holes 4315 are provided on the annular inner surface of the exhaust pipe 436.

[0052] Furthermore, after the welding work is completed on the crossbeams on one set of clamping components 4, the workbench 2 is driven by the motor to rotate ninety degrees. When the workbench 2 rotates, the repulsive force between the magnetic block 433 and the magnetic member 4311 of the clamping component 4 gradually disappears. Since the ball 4314 contacts 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 to restore the elastic deformation, the magnetic block 433 generates a force to move. 43. The sealing cylinder 439 of the clamping assembly 4 is in the position corresponding to the arc-shaped movable groove 4312. Under the elastic force of the spring 434 to restore the elastic deformation, the gas inside the piston cylinder 431 enters the exhaust pipe 436 to squeeze the sealing cylinder 439. The squeezing force causes the sealing cylinder 439 to overcome the elastic force between the sealing cylinder 439 and the connecting frame 438 and move toward the top surface of the arc-shaped movable groove 4312 until the ball 4314 and the circular plate are in the position corresponding to the arc-shaped movable groove 4312. The top surface of 4310 contacts and, at this time, the gas in the internal part of the piston cylinder 431 enters the cavity generated by the movement of the sealing cylinder 439, and the connecting rod 432 undergoes a slight reset movement. Since the clamping block 429 squeezes and fixes the limit block 4211 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 elastic reset movement, but at this time the clamping block 429 will not drive the limit block 4211 to move. This is a conventional technical means in the prior art and will not be described in detail here, and will not drive the welded beam to move, thereby avoiding the problem of damage to the welded beam. 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 limit block 4211 upward, and then move the limit block 4211 horizontally, and then remove the welded beam, thereby ensuring the continuity of the welding work.

[0053] It is worth noting that by setting this group 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 limit block 4211, thereby avoiding the problem of canceling the clamping force on the beam immediately after welding is completed, which will cause cracks or deformation in the weld. By continuously pressing for a certain period of time, the accumulation of thermal stress at the weld is reduced, further ensuring the welding effect of the beam.

[0054] Reference Figure 8 A circular movable groove 4313 is provided on the top surface of the circular plate 4310 , which corresponds to the lower portion of the exhaust pipe 436 at a position rotated 180 degrees clockwise along the welding robot 3 .

[0055] It is worth noting 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 to restore the elastic deformation, and the gap between the sealing cylinder 439 and the circular plate 4310 is opened. The gas inside the piston cylinder 431 is discharged through the gap, and the magnetic block 433 gradually resets, facilitating the next clamping and fixing work.

[0056] It is worth noting that by setting 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 above-mentioned clamping component 4, the amount of gas discharged through the adjustment hole 4315 is not enough to cause obvious movement of the magnetic block 433. However, when the clamping component 4 is rotated to the position of the adjustment hole 4315, since the beams on one group of the clamping components 4 are undergoing welding work at this time, the gas that cannot be discharged through the sealing cylinder 439 and the circular plate 4310 is gradually discharged through the adjustment hole 4315, ensuring that the piston rod 437 is restored to its elastic deformation under the action of the elastic force of the connecting frame 438, and the sealing cylinder 439 can be in a tight state with the ball 4314 again, which is convenient for the next work.

[0057] Reference Figure 6 The bottom surface of the sealing cylinder 439 is provided with evenly distributed balls 4314, which convert the sliding friction between the sealing cylinder 439 and the circular plate 4310 into rolling friction, thereby reducing the wear of the sealing cylinder 439 and the circular plate 4310.

[0058] Reference Figure 5 The inner diameter of the one-way air inlet pipe 435 is larger than the inner diameter of the vent pipe 446, and the gas entering the one-way air inlet pipe 435 per unit time is controlled to avoid the problem that the negative pressure adsorption force generated at the adsorption hole 444 is too large, which makes the fixed rod difficult to move under the squeezing 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 between the fixed rod and the support rod is completed, the outside gas gradually enters the interior of the vent pipe 446, canceling the negative pressure adsorption force generated, and facilitating the subsequent material removal work.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, 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 various 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 a limit assembly (42), and the side of the support frame (41) being connected to an auxiliary assembly (43) for driving the limit assembly (42) to work via a frame body (40); The limiting assembly (42) includes two groups of mounting seats (421) symmetrically mounted on the edge positions of both sides of the top surface of the support frame (41), the side of the mounting seat (421) close to the position of the frame body (40) is rotatably connected to the main extrusion block (422), and the annular side of the main extrusion block (422) is fixedly mounted with a main extrusion plate (423), and the top surface of the support frame (41) is symmetrically slidably connected with two groups of clamping blocks (429), and the sides of the two groups of clamping blocks (429) are both provided with mounting blocks (428), and the main extrusion plate (423) is fixedly mounted with the annular side of the main extrusion block (422). ) is rotatably connected to a mounting block (428) at a corresponding position via a main connecting plate (424); an end face of the mounting seat (421) at a position away from the frame (40) is rotatably connected to a secondary extrusion block (425); a secondary extrusion plate (426) is mounted on an annular side surface of the secondary extrusion block (425); an end of the secondary extrusion plate (426) is rotatably connected to a mounting block (428) at a corresponding position via a secondary connecting plate (427); and a lower end of the main extrusion block (422) is connected to the secondary extrusion block (425) via a connecting block (420); The auxiliary component (43) includes a piston cylinder (431) corresponding to the position of the main extrusion block (422) on the mounting frame (40), 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 slot, and the connecting rod (432) is fixedly connected to the main extrusion block (422) via a slider and a slot. The connecting rod (432) and the slider are connected 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 portion 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 portion of the frame (40); a magnetic member (4311) is provided on the top surface of the base (1) at a position corresponding to the welding manipulator (3); and the magnetic member (4311) corresponds to the position of one of the magnetic blocks (433); The lower portion of the annular inner side surface of the exhaust pipe (436) is connected to a connecting frame (438), the middle portion of the top surface of the connecting frame (438) is elastically slidably connected to a piston rod (437), 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), and the sealing cylinder (439) is in a contact connection with the exhaust pipe (436); The bottom surface of the sealing cylinder (439) is provided with evenly distributed balls (4314); 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 manipulator (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).

2. A welding device for a folding chair according to claim 1, characterized in that: A limiting groove (4210) is provided at the lower portion 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. The welding equipment for folding chairs according to claim 1, characterized in that: A circular movable groove (4313) is provided on the top surface of the circular plate (4310) corresponding to the lower portion of the exhaust pipe (436) at a position rotated 180 degrees clockwise along the welding manipulator (3). The depth of the circular movable groove (4313) is greater than the depth of the sealing cylinder (439).

4. The welding equipment for folding chairs according to claim 1, characterized in that: A placement assembly (44) is provided on the support frame (41), and the placement assembly (44) includes a placement plate (441) uniformly 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 provided in the middle of the top surface of the placement plate (441).

5. The welding equipment for folding chairs according to claim 4, 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) and the ventilation grooves (443) are interconnected, 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.

6. The welding equipment for folding chairs according to claim 5, 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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