Automatic welding equipment for office chair leg central tube

Abstract

The utility model discloses automatic welding equipment for office chair leg central tubes. The automatic welding equipment comprises a rack, the vibrating disc is arranged on one side of the rack and is used for conveying the central pipe; the to-be-fed material positioning device is arranged on the rack and is used for receiving the plurality of central pipes sent out by the vibration disc and sequentially arranging and positioning the central pipes; the spot welding workbench is arranged on the rack and is used for bearing the office chair leg main body; the feeding device is arranged on the rack and is used for placing the central pipe on the to-be-fed positioning device on the office chair leg main body; the pressing and positioning device is arranged on the rack and is used for axially pressing the central pipe on the office chair leg main body; the spot welding device is arranged on the rack and is used for spot welding at the joint of the central pipe and the office chair leg main body; the reinforcing welding workbench is arranged on the rack; the transfer device is arranged on the rack and can be used for conveying the office chair leg main body subjected to spot welding of the central pipe to the reinforcement welding workbench; and the reinforcing welding device is arranged on the rack and is used for reinforcing and welding the central pipe.

Description

[Technical Field]

[0001] This utility model relates to an automatic welding device for the center tube of an office chair leg. [Background Technology]

[0002] Office chair legs on the market are generally manufactured using the molding process disclosed in Chinese invention patent application number 202410663408.0. This process includes a chair leg body formed by stamping from a metal template. The chair leg body includes a fixed part at the center, multiple support parts extending around the fixed part, and an installation part at the extended ends of the support parts. A tubular bushing is welded to the center of the fixed part, a roller seat is welded inside the installation part, and a support inner bone is welded to the support part. The two ends of the support inner bone are fixedly connected to the bushing and the roller seat by welding. Currently, the bushing fixed at the center of the chair leg body is generally welded manually. This method is not only time-consuming and labor-intensive, with high labor costs and low overall efficiency, but also exposes employees to strong light and dust, potentially leading to occupational diseases. Furthermore, the welding quality is unstable, and manual welding is prone to defects such as poor product appearance, incomplete welds, detachment, and missed welds.

[0003] Therefore, this utility model was created based on the above-mentioned shortcomings. [Utility Model Content]

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an automatic welding equipment for the center tube of office chair legs that saves manpower and improves welding efficiency and quality.

[0005] This utility model is achieved through the following technical solution:

[0006] An automatic welding device for the center tube of an office chair leg, characterized in that:

[0007] Includes rack 1;

[0008] Vibratory feeder 2, which is located on one side of the frame 1 and is used to transport the central tube;

[0009] The material positioning device 3 is installed on the frame 1 to receive and position multiple central tubes sent out by the vibratory feeder 2 in sequence.

[0010] A spot welding workbench 4 is mounted on the frame 1 and is used to support the main body of the office chair legs;

[0011] The feeding device 5 is mounted on the frame 1 and is used to place the central tube on the waiting positioning device 3 onto the main body of the office chair leg.

[0012] A pressing and positioning device 6 is provided on the frame 1 and is used to axially press the central tube onto the main body of the office chair leg.

[0013] A spot welding device 7 is arranged on the frame 1 and used for spot welding the center tube and the office chair leg body at the joint;

[0014] A reinforcing welding workbench 8 is arranged on the frame 1 and used for carrying the office chair leg body after the center tube is spot welded;

[0015] A transfer device 9 is arranged on the frame 1 and can send the office chair leg body after the center tube is spot welded to the reinforcing welding workbench 8;

[0016] A reinforcing welding device 10 is arranged on the frame 1 and used for reinforcing welding the center tube and the office chair leg body at the joint.

[0017] The office chair leg center tube automatic welding equipment has the characteristics that the vibration disc 2 is provided with a screening device 21, the screening device 21 comprises a screening block 211, on which a through port 210 matching the shape of the center tube is formed and through which the center tube passes in sequence, and a push cylinder 212 that drives the screening block 211 to push the center tube back into the vibration disc 2 when the center tube is stuck in the through port 210.

[0018] The office chair leg center tube automatic welding equipment has the characteristics that the material positioning device 3 comprises a material discharging chute 31 connected with the vibration disc 2 at one end for the center tube to enter in sequence and a push rod cylinder 32 fixed on the material discharging chute 31, the other end of the material discharging chute 31 is provided with a waiting station 33 for one center tube to enter, and the push rod cylinder 32 is provided with a push rod 321 that extends to block the remaining center tubes when one center tube enters the waiting station 33.

[0019] The office chair leg center tube automatic welding equipment has the characteristics that the frame 1 is provided with a first support frame 11 on one side of the spot welding workbench 4 and a second support frame 12 on one side of the reinforcing welding workbench 8.

[0020] The office chair leg center tube automatic welding equipment has the characteristics that the pressing positioning device 6 is provided with two and located above the spot welding workbench 4 and the reinforcing welding workbench 8 respectively, and the pressing positioning device 6 comprises a pressing cylinder 61 vertically arranged on the first support frame 11 and the second support frame 12, and a pressing block 62 arranged on the piston rod of the pressing cylinder 61 and pressed against the center tube by the pressing cylinder 61.

[0021] The office chair leg center tube automatic welding equipment has the characteristics that the feeding device 5 comprises a material clamping cylinder 51 arranged on the first support frame 11 and capable of clamping the center tube from the material positioning device 3, a vertical driving mechanism 52 that drives the material clamping cylinder 51 to move up and down, and a translation driving mechanism 53 that drives the material clamping cylinder 51 to move horizontally above the material positioning device 3 or above the spot welding workbench 4.

[0022] The office chair leg center tube automatic welding equipment as described above is characterized in that: the translation driving mechanism 53 comprises a first guide rail seat 531 arranged on the first support frame 11, a first horizontal guide rail 532 arranged transversely on the first guide rail seat 531, a first sliding table 533 slidably arranged on the first horizontal guide rail 532, a first screw nut sliding block 534 fixed on the first sliding table 533, a first screw rod 535 arranged in parallel with the first horizontal guide rail 532 and passing through the first screw nut sliding block 534, and a first motor 536 driving the first screw rod 535 to rotate so as to drive the first screw nut sliding block 534 to move along the first screw rod 535 and drive the first sliding table 533 to move horizontally; the vertical driving mechanism 52 comprises a second guide rail seat 521 arranged on the first sliding table 533, a first vertical guide rail 522 arranged vertically on the second guide rail seat 521, a second sliding table 523 slidably arranged on the first vertical guide rail 522, a second screw nut sliding block 524 fixed on the second sliding table 523, a second screw rod 525 arranged in parallel with the first vertical guide rail 522 and passing through the second screw nut sliding block 524, a second motor 526 driving the second screw rod 525 to rotate so as to drive the second screw nut sliding block 524 to move along the second screw rod 525 and drive the second sliding table 523 to move up and down, and a cylinder mounting frame 527 fixed on the second sliding table 523; the clamping cylinder 51 is mounted on the cylinder mounting frame 527.

[0023] The office chair leg center tube automatic welding equipment as described above is characterized in that: the spot welding device 7 comprises a third guide rail seat 71 arranged on the first support frame 11, a second vertical guide rail 72 arranged vertically on the third guide rail seat 71, a third sliding table 73 slidably arranged on the second vertical guide rail 72, a third screw nut sliding block 74 fixed on the third sliding table 73, a third screw rod 75 arranged in parallel with the second vertical guide rail 72 and passing through the third screw nut sliding block 74, a third motor 76 driving the third screw rod 75 to rotate so as to drive the third screw nut sliding block 74 to move along the third screw rod 75 and drive the third sliding table 73 to move up and down, and a first welding gun 77 mounted on the third sliding table 73; the reinforcing welding device 10 comprises a fourth guide rail seat 101 arranged on the second support frame 12, a third vertical guide rail 102 arranged vertically on the fourth guide rail seat 101, a fourth sliding table 103 slidably arranged on the third vertical guide rail 102, a fourth screw nut sliding block 104 fixed on the fourth sliding table 103, a fourth screw rod 105 arranged in parallel with the third vertical guide rail 102 and passing through the fourth screw nut sliding block 104, a fourth motor 106 driving the fourth screw rod 105 to rotate so as to drive the fourth screw nut sliding block 104 to move along the fourth screw rod 105 and drive the fourth sliding table 103 to move up and down, and a second welding gun 107 mounted on the fourth sliding table 103.

[0024] The office chair leg center pipe automatic welding equipment has the characteristics that the transfer device 9 comprises a fifth guide rail base 91 extending from the spot welding workbench 4 to the reinforcing welding workbench 8 and being movable up and down relative to the rack 1, a lifting mechanism 92 driving the fifth guide rail base 91 to move up and down, a second horizontal guide rail 93 arranged along the length direction of the fifth guide rail base 91, a fifth sliding table 94 slidably arranged on the second horizontal guide rail 93, a fifth screw nut sliding block 95 fixed on the fifth sliding table 94, a fifth screw rod 96 arranged in parallel with the second horizontal guide rail 93 and passing through the fifth screw nut sliding block 95, a seventh motor 97 driving the fifth screw rod 96 to rotate and enabling the fifth screw nut sliding block 95 to move along the fifth screw rod 96 and drive the fifth sliding table 94 to move horizontally, and a carrying block 98 arranged on the fifth sliding table 94 and capable of carrying the office chair leg body after the spot welding center pipe.

[0025] The office chair leg center pipe automatic welding equipment has the characteristics that the lifting mechanism 92 comprises a push screw rod 921 supported below the fifth guide rail base 91 and movable up and down relative to the rack 1, an eighth motor 922 arranged on the rack 1, and a connecting rotating shaft 924 driven to rotate by the eighth motor 922 and enabling the push screw rod 921 to rotate through a linkage gear set 923.

[0026] Compared with the prior art, the office chair leg center pipe automatic welding equipment has the following advantages:

[0027] 1、The office chair leg center pipe automatic welding equipment has the characteristics that the center pipe is conveyed to the material positioning device by the vibrating disc and sequentially arranged and positioned, the office chair leg body is placed on the spot welding workbench, then the feeding device places the center pipe on the office chair leg body on the material positioning device and positions the center pipe by the pressing positioning device, then the spot welding device spot welds the joint between the center pipe and the office chair leg body, the center pipe is preliminarily fixed, the transfer device sends the office chair leg body after the spot welding center pipe to the reinforcing welding workbench, and finally the reinforcing welding device reinforces and welds the joint between the center pipe and the office chair leg body, so that the automatic welding of the center pipe and the office chair leg body is realized, the welding is efficient and stable, time and labor are saved, labor cost is saved, production cost is reduced, product quality is guaranteed, automatic production avoids the radiation and harm of welding strong light and smoke dust to employees, and the risk of work injury is minimized. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a perspective view of the office chair leg center pipe automatic welding equipment;

[0029] Figure 2 is a structural schematic view of the vibrating disc of the office chair leg center pipe automatic welding equipment;

[0030] Figure 3Is the structure schematic diagram of the material positioning device of the utility model;

[0031] Figure 4 Is the structure schematic diagram of the material positioning device of the utility model;

[0032] Figure 5 Is the structure schematic diagram of the material positioning device of the utility model;

[0033] Figure 6 Is the structure schematic diagram of the material positioning device of the utility model;

CONCRETE EMBODIMENT

[0034] The utility model is further described below in combination with the drawings:

[0035] As Figures 1 to 6As shown, an automatic welding equipment for the center tubes of office chair legs includes a frame 1; a vibratory feeder 2, which is disposed on one side of the frame 1 and used to transport the center tubes; a waiting and positioning device 3, which is disposed on the frame 1 and used to receive and arrange multiple center tubes fed by the vibratory feeder 2 in sequence; a spot welding workbench 4, which is disposed on the frame 1 and used to support the main body of the office chair leg; a feeding device 5, which is disposed on the frame 1 and used to place the center tubes on the waiting and positioning device 3 onto the main body of the office chair leg; and a pressing and positioning device 6, which is disposed on the frame 1. The system includes: a central tube axially pressing it onto the office chair leg body; a spot welding device 7, mounted on the frame 1 and used for spot welding at the junction of the central tube and the office chair leg body; a reinforcement welding workbench 8, mounted on the frame 1 and used to support the office chair leg body after spot welding the central tube; a transfer device 9, mounted on the frame 1 and used to transfer the office chair leg body after spot welding the central tube to the reinforcement welding workbench 8; and a reinforcement welding device 10, mounted on the frame 1 and used for reinforcement welding at the junction of the central tube and the office chair leg body. Specifically, the spot welding workbench 4 and the reinforcement welding workbench 8 have grooves for the office chair leg body to be engaged and positioned. This invention uses a vibratory feeder 2 to transport the central tube to the waiting and positioning device 3 for sequential positioning. After the main body of the office chair leg is placed on the spot welding workbench 4, the feeding device 5 places the central tube from the waiting and positioning device 3 onto the main body of the office chair leg and presses and positions the central tube using the clamping and positioning device 6. Then, the spot welding device 7 performs spot welding on the joint between the central tube and the main body of the office chair leg to initially fix the central tube. The transfer device 9 then sends the office chair leg with the spot-welded central tube to the reinforcement welding workbench 8. Finally, the reinforcement welding device 10 performs reinforcement welding on the joint between the central tube and the main body of the office chair leg, realizing automatic welding of the central tube and the main body of the office chair leg. The welding is efficient and stable, saving time and effort, reducing labor costs, and helping to reduce production costs and ensure product quality. Moreover, automated production avoids the radiation and harm to employees from the strong light and fumes of welding, minimizing the risk of workplace injuries.

[0036] like Figure 2 As shown, the vibratory feeder 2 is equipped with a screening device 21. The screening device 21 includes a screening block 211 with a passage opening 210 that matches the shape of the central tube and allows the central tube to pass through sequentially, and a push cylinder 212 that drives the screening block 211 to push the central tube back into the vibratory feeder 2 when the central tube gets stuck in the passage opening 210. In a specific implementation, the outer diameter of the central tube gradually increases from top to bottom, with the larger end welded to the main body of the office chair leg. The passage opening 210 is close to a trapezoid, with a longer base and a shorter top. When the vibratory feeder 2 delivers the central tube to the passage opening 210, it must match the passage opening 210 to pass through. Only when the central tube is aligned correctly will it reach the material positioning device 3 to wait for feeding. Otherwise, it will be sent back into the vibratory feeder 2 by the screening block 211 driven by the push cylinder 212.

[0037] As Figure 3 shown, the material positioning device 3 includes a discharge chute 31 connected with the vibration disc 2 for the center tube to enter in sequence and a push rod cylinder 32 fixed on the discharge chute 31, the other end of the discharge chute 31 is provided with a waiting station 33 for a center tube to enter, the push rod cylinder 32 is provided with a push rod 321 which can extend to block the remaining center tube when a center tube enters the waiting station 33, the push rod 321 can block the excessive center tube to avoid affecting the feeding device to take away the center tube on the waiting station 33; when the center tube on the waiting station 33 is taken away, the push rod cylinder 32 drives the push rod 321 to retract, so that the next center tube can slide to the waiting station 33.

[0038] In the utility model, the first support frame 11 and the second support frame 12 are arranged on the rack 1.

[0039] In the utility model, the pressing positioning device 6 is provided with two and is located above the spot welding workbench 4 and the reinforcing welding workbench 8 respectively, the pressing positioning device 6 includes a pressing cylinder 61 vertically arranged on the first support frame 11 and the second support frame 12, a pressing block 62 arranged on the piston rod of the pressing cylinder 61 and driven by the pressing cylinder 61 to press against the center tube.When the center tube is placed on the office chair foot body, the pressing cylinder 61 drives the pressing block 62 to move down and press the center tube on the office chair foot body to position, facilitating the smooth progress of subsequent welding work; when welding is completed, the pressing block 62 resets.

[0040] As Figure 4 shown, the feeding device 5 includes a material clamping cylinder 51 arranged on the first support frame 11 and capable of clamping the center tube from the material positioning device 3, a vertical driving mechanism 52 driving the material clamping cylinder 51 to move up and down, a translation driving mechanism 53 driving the material clamping cylinder 51 to move horizontally above the material positioning device 3 or above the spot welding workbench 4.When the material clamping cylinder 51 clamps the center tube, the vertical driving mechanism 52 drives the material clamping cylinder 51 to move up and lift, and then the translation driving mechanism 53 drives the material clamping cylinder 51 to move horizontally above the spot welding workbench 4, finally the material clamping cylinder 51 places the center tube on the office chair foot body; when the feeding is completed, the material clamping cylinder 51 resets above the waiting station 33.

[0041] Specifically, the translation driving mechanism 53 comprises a first guide rail base 531 arranged on the first support frame 11, a first horizontal guide rail 532 arranged transversely on the first guide rail base 531, a first sliding table 533 slidably arranged on the first horizontal guide rail 532, a first screw nut sliding block 534 fixed on the first sliding table 533, a first screw rod 535 arranged in parallel with the first horizontal guide rail 532 and penetrating through the first screw nut sliding block 534, and a first motor 536 driving the first screw rod 535 to rotate so as to drive the first screw nut sliding block 534 to move along the first screw rod 535 and drive the first sliding table 533 to move horizontally. The vertical driving mechanism 52 comprises a second guide rail base 521 arranged on the first sliding table 533, a first vertical guide rail 522 arranged vertically on the second guide rail base 521, a second sliding table 523 slidably arranged on the first vertical guide rail 522, a second screw nut sliding block 524 fixed on the second sliding table 523, a second screw rod 525 arranged in parallel with the first vertical guide rail 522 and penetrating through the second screw nut sliding block 524, a second motor 526 driving the second screw rod 525 to rotate so as to drive the second screw nut sliding block 524 to move along the second screw rod 525 and drive the second sliding table 523 to move up and down, a cylinder mounting bracket 527 fixed on the second sliding table 523, and the material clamping cylinder 51 mounted on the cylinder mounting bracket 527. Through the above structure, the material clamping cylinder 51 can move up and down and horizontally, and move flexibly between the waiting station 33 and the spot welding workbench 4.

[0042] The spot welding device 7 comprises a third guide rail base 71 arranged on the first support frame 11, a second vertical guide rail 72 arranged vertically on the third guide rail base 71, a third sliding table 73 slidably arranged on the second vertical guide rail 72, a third screw nut sliding block 74 fixed on the third sliding table 73, a third screw rod 75 arranged in parallel with the second vertical guide rail 72 and passing through the third screw nut sliding block 74, a third motor 76 driving the third screw rod 75 to rotate so as to drive the third screw nut sliding block 74 to move along the third screw rod 75 and drive the third sliding table 73 to move up and down, a first welding gun 77 mounted on the third sliding table 73, and the reinforcing welding device 10 comprises a fourth guide rail base 101 arranged on the second support frame 12, a third vertical guide rail 102 arranged vertically on the fourth guide rail base 101, a fourth sliding table 103 slidably arranged on the third vertical guide rail 102, a fourth screw nut sliding block 104 fixed on the fourth sliding table 103, a fourth screw rod 105 arranged in parallel with the third vertical guide rail 102 and passing through the fourth screw nut sliding block 104, a fourth motor 106 driving the fourth screw rod 105 to rotate so as to drive the fourth screw nut sliding block 104 to move along the fourth screw rod 105 and drive the fourth sliding table 103 to move up and down, and a second welding gun 107 mounted on the fourth sliding table 103. Through the above structure, the first welding gun 77 and the second welding gun 107 can move up and down, which facilitates welding in the working position and resetting after moving up. Specifically, the rack 1 is further provided with a motor driving the spot welding workbench 4 and the reinforcing welding workbench 8 to rotate. During the welding process, the spot welding workbench 4 and the reinforcing welding workbench 8 can drive the office chair leg body to rotate under the driving of the corresponding motor, which facilitates welding at different positions.

[0043] As Figure 6As shown, the transfer device 9 comprises a fifth guide rail base 91 extending from the spot welding workbench 4 to the reinforcing welding workbench 8 and movable up and down relative to the rack 1, a lifting mechanism 92 driving the fifth guide rail base 91 to move up and down, a second horizontal guide rail 93 arranged along the length direction of the fifth guide rail base 91, a fifth sliding table 94 slidably arranged on the second horizontal guide rail 93, a fifth screw nut sliding block 95 fixed on the fifth sliding table 94, a fifth screw rod 96 arranged parallel to the second horizontal guide rail 93 and passing through the fifth screw nut sliding block 95, a seventh motor 97 driving the fifth screw rod 96 to rotate so as to drive the fifth screw nut sliding block 95 to move along the fifth screw rod 96 and drive the fifth sliding table 94 to move horizontally, and a load block 98 arranged on the fifth sliding table 94 and capable of bearing the office chair leg body after the spot welding of the center pipe. In the initial state, the load block 98 is below the office chair leg body, and after the center pipe is spot welded on the office chair leg body, the lifting mechanism 92 drives the fifth guide rail base 91 to move up, so that the load block 98 moves up to support the office chair leg body. Then, the seventh motor 97 works to drive the fifth screw rod 96 to rotate so as to drive the fifth screw nut sliding block 95 to move along the fifth screw rod 96 and drive the fifth sliding table 94 to move horizontally, so that the load block 98 with the office chair leg body arrives on the reinforcing welding workbench 8. Finally, the lifting mechanism 92 drives the fifth guide rail base 91 to move down so that the office chair leg body falls on the reinforcing welding workbench 8 for positioning, and then reinforcing welding is performed.

[0044] Specifically, the lifting mechanism 92 comprises a push screw 921 supported below the fifth guide rail base 91 and movable up and down relative to the rack 1, an eighth motor 922 arranged on the rack 1, and a connecting rotating shaft 924 driven by the eighth motor 922 to rotate and drive the push screw 921 to move up and down through a meshing gear set 923 when rotating. The meshing gear set 923 comprises a plurality of meshing gears, one input gear arranged on the connecting rotating shaft 924 and one output gear meshing with the push screw 921. When the eighth motor 922 drives the connecting rotating shaft 924 to rotate, the meshing gear set 923 is driven, thereby driving the push screw 921 to move up and down, so as to lift or lower the fifth guide rail base 91.

Claims

1. An office chair leg center tube automatic welding device characterized in that: it comprises a rack (1); a vibrating disc (2) arranged on one side of the rack (1) and used for conveying center tubes; a material positioning device (3) arranged on the rack (1) and used for receiving and sequentially arranging the center tubes conveyed by the vibrating disc (2); a spot welding workbench (4) arranged on the rack (1) and used for carrying office chair leg bodies; a feeding device (5) arranged on the rack (1) and used for placing the center tubes on the office chair leg bodies; a pressing positioning device (6) arranged on the rack (1) and used for pressing the center tubes on the office chair leg bodies in an axial direction; a spot welding device (7) arranged on the rack (1) and used for spot welding the center tubes and the office chair leg bodies; a reinforcing welding workbench (8) arranged on the rack (1) and used for carrying the office chair leg bodies after the center tubes are spot welded; a transfer device (9) arranged on the rack (1) and capable of conveying the office chair leg bodies after the center tubes are spot welded to the reinforcing welding workbench (8); and a reinforcing welding device (10) arranged on the rack (1) and used for reinforcing welding the center tubes and the office chair leg bodies. The vibrating disc (2) is provided with a screening device (21), which comprises a screening block (211) with a through hole (210) matching the shape of the center tube and through which the center tube sequentially passes, and a push cylinder (212) for driving the screening block (211) to push the center tube back into the vibrating disc (2) when the center tube is stuck in the through hole (210). The material positioning device (3) comprises a material discharging chute (31) connected to the vibrating disc (2) for sequentially entering the center tubes, and a push rod cylinder (32) fixed on the material discharging chute (31), one end of the material discharging chute (31) is provided with a waiting station (33) for one center tube to enter, and the push rod cylinder (32) is provided with a push rod (321) which is extended to block the remaining center tubes when one center tube enters the waiting station (33). The rack (1) is provided with a first support frame (11) located on one side of the spot welding workbench (4) and a second support frame (12) located on one side of the reinforcing welding workbench (8). The pressing positioning device (6) is arranged above the spot welding workbench (4) and the reinforcing welding workbench (8), and comprises a pressing cylinder (61) arranged vertically on the first support frame (11) and the second support frame (12), and a pressing block (62) arranged on the piston rod of the pressing cylinder (61) and pressed against the center tube driven by the pressing cylinder (61). ​ ​ ​ ​ ​ ​ 2. The office chair foot center tube automatic welding apparatus of claim 1, wherein: ​ 3. The office chair foot center tube automatic welding apparatus of claim 1, wherein: ​ 4. The office chair foot center tube automatic welding apparatus of claim 1, wherein: ​ 5. The office chair foot center tube automatic welding apparatus of claim 4, wherein: ​ 6. The office chair foot center tube automatic welding apparatus of claim 4, wherein: The feeding device (5) comprises a clamping cylinder (51) arranged on the first support frame (11) and capable of clamping the center pipe from the material positioning device (3), a vertical driving mechanism (52) driving the clamping cylinder (51) to move up and down, and a translation driving mechanism (53) driving the clamping cylinder (51) to move horizontally above the material positioning device (3) or above the spot welding workbench (4).

7. The office chair foot center tube automatic welding apparatus of claim 6, wherein: The translation driving mechanism (53) comprises a first guide rail base (531) arranged on the first support frame (11), a first horizontal guide rail (532) arranged transversely on the first guide rail base (531), a first sliding table (533) slidably arranged on the first horizontal guide rail (532), a first screw nut sliding block (534) fixed on the first sliding table (533), a first screw rod (535) arranged in parallel with the first horizontal guide rail (532) and passing through the first screw nut sliding block (534), and a first motor (536) driving the first screw rod (535) to rotate, so that the first screw nut sliding block (534) moves along the first screw rod (535) and drives the first sliding table (533) to move horizontally. The vertical driving mechanism (52) comprises a second guide rail base (521) arranged on the first sliding table (533), a first vertical guide rail (522) arranged vertically on the second guide rail base (521), a second sliding table (523) slidably arranged on the first vertical guide rail (522), a second screw nut sliding block (524) fixed on the second sliding table (523), a second screw rod (525) arranged in parallel with the first vertical guide rail (522) and passing through the second screw nut sliding block (524), a second motor (526) driving the second screw rod (525) to rotate, so that the second screw nut sliding block (524) moves along the second screw rod (525) and drives the second sliding table (523) to move up and down, and a cylinder mounting frame (527) fixed on the second sliding table (523). The clamping cylinder (51) is mounted on the cylinder mounting frame (527).

8. The office chair foot center tube automatic welding apparatus of claim 4, wherein: The spot welding device (7) comprises a third guide rail base (71) arranged on the first support frame (11), a second vertical guide rail (72) vertically arranged on the third guide rail base (71), a third sliding table (73) slidably arranged on the second vertical guide rail (72), a third screw nut sliding block (74) fixed on the third sliding table (73), a third screw rod (75) arranged in parallel with the second vertical guide rail (72) and passing through the third screw nut sliding block (74), a third motor (76) driving the third screw rod (75) to rotate so that the third screw nut sliding block (74) moves along the third screw rod (75) to drive the third sliding table (73) to move up and down, and a first welding gun (77) mounted on the third sliding table (73).

9. The office chair foot center tube automatic welding apparatus of claim 1, wherein: The reinforcing welding device (10) comprises a fourth guide rail base (101) arranged on the second support frame (12), a third vertical guide rail (102) vertically arranged on the fourth guide rail base (101), a fourth sliding table (103) slidably arranged on the third vertical guide rail (102), a fourth screw nut sliding block (104) fixed on the fourth sliding table (103), a fourth screw rod (105) arranged in parallel with the third vertical guide rail (102) and passing through the fourth screw nut sliding block (104), a fourth motor (106) driving the fourth screw rod (105) to rotate so that the fourth screw nut sliding block (104) moves along the fourth screw rod (105) to drive the fourth sliding table (103) to move up and down, and a second welding gun (107) mounted on the fourth sliding table (103).

10. The office chair foot center tube automatic welding apparatus of claim 9, wherein: The transfer device (9) comprises a fifth guide rail base (91) extending from the spot welding workbench (4) to the reinforcing welding workbench (8) and being movable up and down relative to the rack (1), a lifting mechanism (92) driving the fifth guide rail base (91) to move up and down, a second horizontal guide rail (93) arranged along the length direction of the fifth guide rail base (91), a fifth sliding table (94) slidably arranged on the second horizontal guide rail (93), a fifth screw nut sliding block (95) fixed on the fifth sliding table (94), a fifth screw rod (96) arranged in parallel with the second horizontal guide rail (93) and passing through the fifth screw nut sliding block (95), a seventh motor (97) driving the fifth screw rod (96) to rotate so that the fifth screw nut sliding block (95) moves along the fifth screw rod (96) to drive the fifth sliding table (94) to move horizontally, and a carrying block (98) arranged on the fifth sliding table (94) and capable of carrying the office chair leg body behind the spot welding center pipe. The lifting mechanism (92) comprises a pushing screw rod (921) supported below the fifth guide rail base (91) and movable up and down relative to the rack (1), an eighth motor (922) arranged on the rack (1), and a connecting rotating shaft (924) driven to rotate by the eighth motor (922) and driving the pushing screw rod (921) to rotate through a gear set (923) when rotating.

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