Chair back welding fixing tool

Abstract

The present application relates to the technical field of welding, in particular to a chair back welding fixing tool, which comprises a workbench, two first sliding blocks, a first bidirectional screw rod, two leg clamping mechanisms, a driving mechanism, a second sliding block, a first driving screw rod, a lifting mechanism, a seat plate support table, a centering clamping mechanism and a lateral clamping mechanism; the distance between the two leg clamping mechanisms is adjusted by rotating the first bidirectional screw rod to adapt to chair backs of different widths; the leg clamping mechanisms are driven by the driving mechanism to tightly hold the chair back legs; the seat plate on the seat plate support table is moved to tightly contact the chair back by rotating the first driving screw rod; the height of the seat plate is adjusted by the lifting mechanism to match the chair back legs in the height direction; the seat plate is clamped from both sides by the centering clamping mechanism to be centrally positioned; the seat plate is pressed from the side by the lateral clamping mechanism to prevent movement during welding; thus, the problem that the existing fixing tool can only weld and assemble single-size seats and has poor versatility is solved.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a welding fixture for chair backs. Background Technology

[0002] The existing student chair consists of two parts: a metal seat plate with two metal legs vertically welded to the front bottom and a metal backrest with two one-piece metal legs underneath. The metal backrest and the two metal legs form an inverted U-shape. After the metal backrest is welded to the rear end of the metal seat plate, a four-legged chair is formed.

[0003] Currently, during welding, fixed fixtures are used to position and clamp the metal seat plate with welded metal legs and the metal chair back respectively, and then weld them together.

[0004] However, the positioning structure of the aforementioned fixed tooling is a non-adjustable design, which can only be used for welding seats of a single size. When the size of a product batch changes, the tooling needs to be replaced, resulting in poor versatility and high production costs. Summary of the Invention

[0005] The purpose of this invention is to provide a chair back welding fixture, which aims to solve the problem that existing fixtures can only weld and assemble chairs of a single size, resulting in insufficient versatility.

[0006] To achieve the above objectives, the present invention provides a chair back welding and fixing fixture, including a worktable, two first sliders, a first bidirectional lead screw, two leg clamping mechanisms, a drive mechanism, a second slider, a first drive lead screw, a lifting mechanism, a seat support platform, a centering clamping mechanism, and a lateral clamping mechanism. The worktable is provided with a first slide groove and a second slide groove; two first sliders are slidably disposed in the first slide grooves respectively; a first bidirectional lead screw is rotatably disposed on the worktable and threadedly connected to the two first sliders respectively; each first slider is provided with a leg clamping mechanism; a drive mechanism is disposed at the bottom of the worktable for driving the two leg clamping mechanisms to perform clamping actions; the second slider is slidably disposed in the second slide groove; the first drive lead screw is rotatably disposed on the worktable and threadedly connected to the second slider; a lifting mechanism is disposed on the second slider; a seat plate support is disposed at the top of the lifting mechanism; a centering clamping mechanism is disposed on the seat plate support; and a lateral clamping mechanism is disposed on the seat plate support.

[0007] The outrigger clamping mechanism includes a square tube, four clamping components, and a driving component; The square tube is fixedly mounted on the top of the first slider; the four clamping members are respectively mounted on the square tube; the driving member is mounted on the periphery of the square tube and is used to drive the four clamping members to perform clamping actions.

[0008] The clamping component includes multiple first guide rods, abutment plates, mounting plates, and multiple springs; Multiple first guide rods are slidably disposed on the square tube and pass through the square tube; the abutment plate is fixedly disposed at one end of the multiple first guide rods located inside the square tube; the mounting plate is fixedly disposed at one end of the multiple first guide rods located outside the square tube; a spring is sleeved on each first guide rod, and the spring is located outside the square tube.

[0009] The driving component includes two connecting rods, a synchronizing ring, a pressing block, four inner triangular blocks, and four outer triangular blocks; The two connecting rods are slidably mounted on the first slider and pass through the first slider; the synchronization ring is fixedly mounted on the top of the two connecting rods and located around the square tube; the pressing block is fixedly mounted on the bottom of the two connecting rods; the four inner triangular blocks are fixedly mounted on the four mounting plates; the four outer triangular blocks are fixedly mounted on the synchronization ring; the four outer triangular blocks and the four inner triangular blocks are in one-to-one contact.

[0010] The drive mechanism includes an electric push rod, a mounting block, and a pressure rod; The electric push rod is fixedly installed at the bottom of the workbench; the mounting block is fixedly installed at the output end of the electric push rod; the pressure rod is fixedly installed on the mounting block and is slidably connected to the two pressing blocks respectively, and passes through the two pressing blocks respectively.

[0011] The lifting mechanism includes a U-shaped plate, multiple second guide rods, and a second drive screw. The U-shaped plate is fixedly mounted on the top of the second slider; a plurality of second guide rods are slidably mounted on the U-shaped plate and pass through the U-shaped plate; the second drive screw is rotatably connected to the seat plate support platform and threadedly connected to the U-shaped plate, and passes through the U-shaped plate.

[0012] The centering clamping mechanism includes two third sliders, a second bidirectional lead screw, and two centering clamping plates. The seat plate support platform is provided with a third sliding groove; the two third sliders are respectively slidably disposed in the third sliding groove; the second bidirectional lead screw is rotatably disposed on the seat plate support platform and is threadedly connected to the two third sliders respectively; the two centering clamping plates are respectively fixedly disposed on the top of the two third sliders.

[0013] The lateral clamping mechanism includes two third guide rods, a lateral clamping plate, and a third drive screw; The two third guide rods are slidably disposed on the seat plate support platform and pass through the seat plate support platform respectively; the lateral clamping plate is fixedly disposed at one end of the two third guide rods; the third drive screw is rotatably connected to the lateral clamping plate and threadedly connected to the seat plate support platform, and passes through the seat plate support platform.

[0014] The lateral clamping mechanism further includes a friction pad; The friction pad is fixedly mounted on the lateral clamping plate.

[0015] The chair back welding and fixing fixture also includes multiple casters; Multiple casters are rotatably mounted on the bottom of the worktable.

[0016] This invention discloses a chair back welding and fixing fixture. The worktable is provided with a first and a second sliding groove, which respectively guide the movement of two first and second sliders. By rotating the first bidirectional lead screw, with its two ends having opposite thread directions, the two first sliders can be driven to move towards or away from each other along the first sliding groove, thereby adjusting the distance between the two leg clamping mechanisms to accommodate the distance between the two legs of chair backs of different widths. The driving mechanism is used to drive the two leg clamping mechanisms to perform clamping actions, providing a unified power source so that the two sets of leg clamping mechanisms can simultaneously tighten or loosen the two legs of the chair back. By rotating the first driving lead screw, the second slider can be driven to move along the second sliding groove, thereby causing the lifting mechanism, the seat support platform and its centering clamping mechanism and lateral clamping mechanism to translate as a whole, so that the seat plate already clamped and fixed on the seat support platform moves closer to the chair back clamped and fixed by the leg clamping mechanisms until the rear end of the seat plate contacts and abuts the chair back, at which point welding can be performed. The lifting mechanism is mounted on the second slider and moves together with the second slider. The seat support platform is located on top of the lifting mechanism, which adjusts the support height of the seat support platform to align the seat plate with the clamped chair back in the height direction. The centering clamping mechanism is located on the seat support platform and clamps the seat plate from both sides, centering it in the width direction. The lateral clamping mechanism is located on the seat support platform and presses the seat plate firmly from the side to prevent it from shifting during welding. This solves the problem that existing fixed fixtures can only weld and assemble seats of a single size, lacking versatility. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention.

[0019] Figure 2 This is a structural schematic diagram of the present invention from another perspective.

[0020] Figure 3 This is a structural schematic diagram of the present invention from another perspective.

[0021] Figure 4 This is a structural schematic diagram of the present invention from another perspective.

[0022] Figure 5 This is a schematic diagram of the support leg clamping mechanism of the present invention.

[0023] Figure 6 This is a schematic diagram of the support leg clamping mechanism of the present invention from another angle.

[0024] 1-Workbench, 2-First slider, 3-First bidirectional lead screw, 4-Leg clamping mechanism, 5-Drive mechanism, 6-Second slider, 7-First drive lead screw, 8-Lifting mechanism, 9-Seat support platform, 10-Centering clamping mechanism, 11-Side clamping mechanism, 12-Wheel caster, 101-First slide rail, 102-Second slide rail, 401-Square tube, 402-Clamping component, 403-Drive component, 4021-First guide rod, 4022-Abutment plate, 4023-Mounting plate, 4024-Spring, 4031 - Connecting rod, 4032 Synchronous ring, 4033 Pressing block, 4034 Inner triangular block, 4035 Outer triangular block, 501 Electric push rod, 502 Mounting block, 503 Pressure rod, 801 U-shaped plate, 802 Second guide rod, 803 Second drive screw, 901 Third slide groove, 1001 Third slider, 1002 Second bidirectional screw, 1003 Centering clamping plate, 1101 Third guide rod, 1102 Lateral clamping plate, 1103 Third drive screw, 1104 Friction pad. Detailed Implementation

[0025] Please see Figures 1-6 ,in, Figure 1 This is a schematic diagram of the structure of the present invention. Figure 2 This is a structural schematic diagram of the present invention from another perspective. Figure 3 This is a structural schematic diagram of the present invention from another perspective. Figure 4 This is a structural schematic diagram of the present invention from another perspective. Figure 5 This is a schematic diagram of the support leg clamping mechanism of the present invention. Figure 6This is a schematic diagram of the support leg clamping mechanism of the present invention from another angle.

[0026] This invention provides a chair back welding and fixing fixture: including a worktable 1, two first sliders 2, a first bidirectional lead screw 3, two leg clamping mechanisms 4, a drive mechanism 5, a second slider 6, a first drive lead screw 7, a lifting mechanism 8, a seat support platform 9, a centering clamping mechanism 10, and a lateral clamping mechanism 11; the worktable 1 is provided with a first slide groove 101 and a second slide groove 102; the leg clamping mechanism 4 includes a square tube 401, four clamping members 402, and a drive member 403; the clamping member 402 includes multiple first guide rods 4021, abutment plates 4022, mounting plates 4023, and multiple springs 4024; the drive member 403 includes two connecting rods 4031, a synchronization ring 4032, a pressing block 4033, four inner triangular blocks 4034, and four outer triangular blocks 4035. 035; The drive mechanism 5 includes an electric push rod 501, a mounting block 502, and a pressure rod 503; The lifting mechanism 8 includes a U-shaped plate 801, multiple second guide rods 802, and a second drive screw 803; The centering clamping mechanism 10 includes two third sliders 1001, a second bidirectional screw 1002, and two centering clamping plates 1003; The seat support platform 9 is provided with a third sliding groove 901; The lateral clamping mechanism 11 includes two third guide rods 1101, a lateral clamping plate 1102, and a third drive screw 1103; The lateral clamping mechanism 11 also includes a friction pad 1104; The chair back welding fixing fixture also includes multiple universal wheels 12; The aforementioned solution solves the problem that existing fixing fixtures can only weld and assemble seats of a single size, resulting in insufficient versatility.

[0027] Furthermore, the two first sliders 2 are slidably disposed within the first slide groove 101; the first bidirectional lead screw 3 is rotatably disposed on the worktable 1 and threadedly connected to the two first sliders 2 respectively; each first slider 2 is provided with a leg clamping mechanism 4; the driving mechanism 5 is disposed at the bottom of the worktable 1 and is used to drive the two leg clamping mechanisms 4 to perform clamping actions; the second slider 6 is slidably disposed within the second slide groove 102; the first driving lead screw 7 is rotatably disposed on the worktable 1 and threadedly connected to the second slider 6; the lifting mechanism 8 is disposed on the second slider 6; the seat plate support platform 9 is disposed at the top of the lifting mechanism 8; the centering clamping mechanism 10 is disposed on the seat plate support platform 9; and the lateral clamping mechanism 11 is disposed on the seat plate support platform 9.

[0028] In this embodiment, the first slide groove 101 and the second slide groove 102 provided on the workbench 1 provide movement guides for the two first sliders 2 and the two second sliders 6, respectively. By rotating the first bidirectional lead screw 3, which has opposite threads at both ends, the two first sliders 2 can be driven to move towards or away from each other along the first slide groove 101, thereby adjusting the distance between the two leg clamping mechanisms 4 to accommodate the distance between the two legs of chair backs with different widths. The drive mechanism 5 is used to drive the two leg clamping mechanisms 4 to perform clamping actions, providing a unified power source so that the two sets of leg clamping mechanisms 4 can simultaneously tighten or loosen the two legs of the chair back. By rotating the first drive screw 7, the second slider 6 can be driven to move along the second slide groove 102, thereby causing the lifting mechanism 8, the seat support platform 9, and the centering clamping mechanism 10 and the lateral clamping mechanism 11 on it to translate as a whole. This causes the seat plate, which is already clamped and fixed on the seat support platform 9, to move closer to the chair back, which is already clamped and fixed by the support leg clamping mechanism 4, until the rear end of the seat plate contacts and abuts the chair back. At this point, welding can be performed. The lifting mechanism 8 is mounted on the second slider 6 and moves together with the second slider 6. The seat support platform 9 is mounted on top of the lifting mechanism 8. The lifting mechanism 8 is used to adjust the support height of the seat support platform 9 so that the seat plate matches the clamped chair back in the height direction. The centering clamping mechanism 10 is mounted on the seat support platform 9 and is used to clamp the seat plate from both sides, so that the seat plate is centered in the width direction. The lateral clamping mechanism 11 is mounted on the seat support platform 9 and is used to press the seat plate from the side to prevent the seat plate from shifting during welding. This solves the problem that existing fixed tooling can only weld and assemble seats of a single size, resulting in insufficient versatility.

[0029] Furthermore, the square tube 401 is fixedly disposed on the top of the first slider 2; the four clamping members 402 are respectively disposed on the square tube 401; the driving member 403 is disposed on the periphery of the square tube 401 and is used to drive the four clamping members 402 to perform clamping actions.

[0030] In this embodiment, the leg clamping mechanism 4 accommodates the backrest legs through the square tube 401, and the four clamping members 402 respectively clamp the legs from four directions of the square tube 401. The driving member 403 is used to drive the four clamping members 402 to achieve the clamping action, so that the four clamping members 402 simultaneously retract towards the center of the square tube 401 or simultaneously release outward.

[0031] Furthermore, a plurality of first guide rods 4021 are slidably disposed on the square tube 401 and pass through the square tube 401; the abutment plate 4022 is fixedly disposed at one end of the plurality of first guide rods 4021 located inside the square tube 401; the mounting plate 4023 is fixedly disposed at one end of the plurality of first guide rods 4021 located outside the square tube 401; a spring 4024 is sleeved on each first guide rod 4021, and the spring 4024 is located outside the square tube 401.

[0032] In this embodiment, a plurality of first guide rods 4021 pass through the square tube 401, allowing the first guide rods 4021 to slide relative to the square tube 401; the abutment plate 4022 is located inside the square tube 401 and is used to contact and hold the chair back legs; the mounting plate 4023 is located outside the square tube 401 and is connected to the abutment plate 4022 through the first guide rods 4021, and when the mounting plate 4023 is moved by force, it drives the abutment plate 4022 to move synchronously; the spring 4024 is sleeved on the first guide rods 4021 and located outside the square tube 401, and is used to provide a restoring force so that the abutment plate 4022 automatically releases after the external force is lost.

[0033] Furthermore, the two connecting rods 4031 are slidably disposed on the first slider 2 and pass through the first slider 2; the synchronization ring 4032 is fixedly disposed at the top of the two connecting rods 4031 and located around the square tube 401; the pressing block 4033 is fixedly disposed at the bottom of the two connecting rods 4031; the four inner triangular blocks 4034 are fixedly disposed on the four mounting plates 4023; the four outer triangular blocks 4035 are fixedly disposed on the synchronization ring 4032; the four outer triangular blocks 4035 and the four inner triangular blocks 4034 are in one-to-one contact.

[0034] In this embodiment, when the pressing block 4033 is subjected to force, it drives the synchronous ring 4032 to move up and down through the two connecting rods 4031; when the synchronous ring 4032 moves down, the outer triangular block 4035 squeezes the inner triangular block 4034, pushing the mounting plate 4023 to move towards the center of the square tube 401, and then drives the abutment plate 4022 to hug the chair back support leg through the first guide rod 4021.

[0035] Furthermore, the electric push rod 501 is fixedly installed at the bottom of the workbench 1; the mounting block 502 is fixedly installed at the output end of the electric push rod 501; the pressure rod 503 is fixedly installed on the mounting block 502 and is slidably connected to the two pressing blocks 4033 respectively, and passes through the two pressing blocks 4033 respectively.

[0036] In this embodiment, the electric push rod 501 serves as a power source, driving the pressure rod 503 to move up and down via the mounting block 502. The pressure rod 503 simultaneously passes through both pressing blocks 4033. When the electric push rod 501 extends, the pressure rod 503 presses down on the pressing blocks 4033. The pressing blocks 4033, through the connecting rod 4031, pull the synchronous ring 4032 downward, thereby driving the outer triangular block 4035 to squeeze the inner triangular block 4034, causing the mounting plate to... 4023 moves toward the center of the square tube 401, and the abutment plate 4022 hugs the chair back support leg; when the electric push rod 501 retracts, the pressure rod 503 moves upward and drives the pressing block 4033 to move upward, and the pressing block 4033 pushes the synchronous ring 4032 to move upward and reset through the connecting rod 4031. The outer triangular block 4035 resets together with the synchronous ring 4032, the spring 4024 pushes the mounting plate 4023 to reset outward, and the abutment plate 4022 is released.

[0037] Furthermore, the U-shaped plate 801 is fixedly disposed on the top of the second slider 6; a plurality of second guide rods 802 are respectively slidably disposed on the U-shaped plate 801 and pass through the U-shaped plate 801; the second drive screw 803 is rotatably connected to the seat plate support platform 9 and threadedly connected to the U-shaped plate 801 and passes through the U-shaped plate 801.

[0038] In this embodiment, the lifting mechanism 8 moves together with the second slider 6 via the U-shaped plate 801; multiple second guide rods 802 provide guidance for the lifting and lowering of the seat support platform 9, ensuring smooth lifting and lowering; by rotating the second drive screw 803, which is threadedly engaged with the U-shaped plate 801, the seat support platform 9 is driven to rise or fall, thereby adjusting the support height of the seat support platform 9 so that the seat placed on it matches the backrest legs that have been clamped and fixed in the height direction.

[0039] Furthermore, the seat plate support platform 9 is provided with a third slide groove 901; the two third sliders 1001 are respectively slidably disposed in the third slide groove 901; the second bidirectional lead screw 1002 is rotatably disposed on the seat plate support platform 9 and is threadedly connected to the two third sliders 1001 respectively; the two centering clamping plates 1003 are respectively fixedly disposed on the top of the two third sliders 1001.

[0040] In this embodiment, by rotating the second bidirectional lead screw 1002, the two third sliders 1001 can be driven to move towards or away from each other along the third slide groove 901 by means of the opposite screw threads at both ends, thereby adjusting the distance between the two centering clamping plates 1003; the two centering clamping plates 1003 clamp from both sides of the base plate towards the center, so that the base plate is centered in the width direction.

[0041] Furthermore, the two third guide rods 1101 are slidably disposed on the seat plate support platform 9 and pass through the seat plate support platform 9 respectively; the lateral clamping plate 1102 is fixedly disposed at one end of the two third guide rods 1101; the third drive screw 1103 is rotatably connected to the lateral clamping plate 1102 and threadedly connected to the seat plate support platform 9, and passes through the seat plate support platform 9.

[0042] In this embodiment, the two third guide rods 1101 provide movement guidance for the lateral clamping plate 1102; by rotating the third drive screw 1103, which is threadedly engaged with the seat plate support 9, the lateral clamping plate 1102 is pushed closer to or away from the seat plate, pressing the seat plate from the side and also pressing a portion of the support legs to prevent the seat plate from shifting during welding. The overall structure is an L-shape for clamping the seat plate and the two support legs. After clamping, the two support legs are located on the sides of the two third guide rods 1101.

[0043] Furthermore, the friction pad 1104 is fixedly mounted on the lateral clamping plate 1102.

[0044] In this embodiment, the friction pad 1104 is fixedly disposed on the lateral clamping plate 1102 to increase the friction between the lateral clamping plate 1102 and the seat plate, so that the seat plate is more stable after being pressed and is not easy to slip.

[0045] Furthermore, multiple casters 12 are rotatably mounted on the bottom of the workbench 1.

[0046] In this embodiment, multiple casters 12 are rotatably mounted on the bottom of the workbench 1, which facilitates the movement and handling of the entire tooling to meet the needs of different welding stations.

[0047] This embodiment describes a chair back welding fixture. Based on the dimensions of the chair to be welded, the first bidirectional lead screw 3 is rotated, driving the two first sliders 2 to move towards or away from each other along the first slide groove 101. This adjusts the distance between the two leg clamping mechanisms 4 to match the distance between the two legs of the chair back. The two legs of the chair back are inserted into the two square tubes 401 respectively. The electric push rod 501 is activated, extending and driving the pressure rod 503 to press down the pressing block 4033 via the mounting block 502. The pressing block 4033 pulls the synchronous ring 4032 downward via the connecting rod 4031. The outer triangular block 4035 on the synchronous ring 4032 presses against the inner triangular block 4034 on the mounting plate 4023, driving the mounting plate 4023 to move towards the center of the square tube 401. The abutment plate 4022 then grips the chair back legs. Rotate the second drive screw 803, which is threaded into the U-shaped plate 801, to drive the seat support platform 9 to rise or fall, adjusting its support height to match the clamped chair back in the height direction. Place the seat plate on the seat support platform 9, and rotate the second bidirectional screw 1002 to drive the two third sliders 1001 to move towards each other along the third slide groove 901, causing the two centering clamping plates 1003 to clamp the seat plate from both sides toward the center, positioning the seat plate in the center in the width direction. Rotate the third drive screw 1103 to push the lateral clamping plate 1102 to press the seat plate and part of the support legs from the side, fixing the L-shaped structure formed by the seat plate and the two support legs. Rotate the first drive screw 7 to drive the second slider 6 to move along the second slide groove 102, causing the seat plate on the seat support platform 9 to move towards the chair back until the rear end of the seat plate contacts and abuts the end of the chair back support leg. At this point, welding can be performed at the contact point.

[0048] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A chair back welding and fixing fixture, characterized in that, It includes a worktable, two first sliders, a first bidirectional lead screw, two support leg clamping mechanisms, a drive mechanism, a second slider, a first drive lead screw, a lifting mechanism, a seat support platform, a centering clamping mechanism, and a lateral clamping mechanism; The worktable is provided with a first slide groove and a second slide groove; two first sliders are slidably disposed in the first slide grooves respectively; a first bidirectional lead screw is rotatably disposed on the worktable and threadedly connected to the two first sliders respectively; each first slider is provided with a leg clamping mechanism; a drive mechanism is disposed at the bottom of the worktable for driving the two leg clamping mechanisms to perform clamping actions; the second slider is slidably disposed in the second slide groove; the first drive lead screw is rotatably disposed on the worktable and threadedly connected to the second slider; a lifting mechanism is disposed on the second slider; a seat plate support is disposed at the top of the lifting mechanism; a centering clamping mechanism is disposed on the seat plate support; and a lateral clamping mechanism is disposed on the seat plate support.

2. The chair back welding and fixing fixture as described in claim 1, characterized in that, The outrigger clamping mechanism includes a square tube, four clamping components, and a driving component; The square tube is fixedly mounted on the top of the first slider; the four clamping members are respectively mounted on the square tube; the driving member is mounted on the periphery of the square tube and is used to drive the four clamping members to perform clamping actions.

3. The chair back welding and fixing fixture as described in claim 2, characterized in that, The clamping component includes multiple first guide rods, a retaining plate, a mounting plate, and multiple springs; Multiple first guide rods are slidably disposed on the square tube and pass through the square tube; the abutment plate is fixedly disposed at one end of the multiple first guide rods located inside the square tube; the mounting plate is fixedly disposed at one end of the multiple first guide rods located outside the square tube; a spring is sleeved on each first guide rod, and the spring is located outside the square tube.

4. The chair back welding and fixing fixture as described in claim 3, characterized in that, The driving component includes two connecting rods, a synchronizing ring, a pressing block, four inner triangular blocks, and four outer triangular blocks; The two connecting rods are slidably mounted on the first slider and pass through the first slider; the synchronization ring is fixedly mounted on the top of the two connecting rods and located around the square tube; the pressing block is fixedly mounted on the bottom of the two connecting rods; the four inner triangular blocks are fixedly mounted on the four mounting plates; the four outer triangular blocks are fixedly mounted on the synchronization ring; the four outer triangular blocks and the four inner triangular blocks are in one-to-one contact.

5. The chair back welding and fixing fixture as described in claim 4, characterized in that, The drive mechanism includes an electric push rod, a mounting block, and a pressure rod; The electric push rod is fixedly installed at the bottom of the workbench; the mounting block is fixedly installed at the output end of the electric push rod; the pressure rod is fixedly installed on the mounting block and is slidably connected to the two pressing blocks respectively, and passes through the two pressing blocks respectively.

6. The chair back welding and fixing fixture as described in claim 5, characterized in that, The lifting mechanism includes a U-shaped plate, multiple second guide rods, and a second drive screw. The U-shaped plate is fixedly mounted on the top of the second slider; a plurality of second guide rods are slidably mounted on the U-shaped plate and pass through the U-shaped plate; the second drive screw is rotatably connected to the seat plate support platform and threadedly connected to the U-shaped plate, and passes through the U-shaped plate.

7. The chair back welding and fixing fixture as described in claim 6, characterized in that, The centering clamping mechanism includes two third sliders, a second bidirectional lead screw, and two centering clamping plates; The seat plate support platform is provided with a third sliding groove; the two third sliders are respectively slidably disposed in the third sliding groove; the second bidirectional lead screw is rotatably disposed on the seat plate support platform and is threadedly connected to the two third sliders respectively; the two centering clamping plates are respectively fixedly disposed on the top of the two third sliders.

8. The chair back welding and fixing fixture as described in claim 7, characterized in that, The lateral clamping mechanism includes two third guide rods, a lateral clamping plate, and a third drive screw; The two third guide rods are slidably disposed on the seat plate support platform and pass through the seat plate support platform respectively; the lateral clamping plate is fixedly disposed at one end of the two third guide rods; the third drive screw is rotatably connected to the lateral clamping plate and threadedly connected to the seat plate support platform, and passes through the seat plate support platform.

9. The chair back welding and fixing fixture as described in claim 8, characterized in that, The lateral clamping mechanism also includes a friction pad; The friction pad is fixedly mounted on the lateral clamping plate.

10. The chair back welding and fixing fixture as described in claim 9, characterized in that, The chair back welding and fixing fixture also includes multiple casters; Multiple casters are rotatably mounted on the bottom of the worktable.

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