Automatic electric arc welding device for chair metal frame

Abstract

The application is suitable for the technical field of chair welding, and provides a chair metal frame automatic arc welding device, which comprises an automatic arc welding frame, an arc welding head for automatic arc welding is installed at one end of the automatic arc welding frame, and a positioning and clamping assembly for adaptively clamping a chair metal frame is installed at the other end of the automatic arc welding frame; the positioning and clamping assembly comprises two multi-section clamping arms, the multi-section clamping arm comprises a plurality of unit clamping arms, and the unit clamping arms are sequentially assembled in head-to-tail mode; the unit clamping arm comprises a plurality of clamping plates and a joint, and the joint is assembled on the clamping plates; the joint is used for adjusting the rotation angle of the clamping plates in the transverse direction and / or the longitudinal direction; adaptive clamping of chair metal frames with different shapes, models and sizes, such as a single-column rotary base of a chair metal frame and a special-shaped joint with a compatible curved surface at a multi-hinge structure of a folding chair, is realized.

Description

Technical Field

[0001] This invention relates to the field of chair welding technology, and more particularly to an automatic arc welding device for chair metal frames. Background Technology

[0002] The automated arc welding of the chair's metal frame utilizes digital pulsed MIG / MAG welding technology, employing a six-axis robot in conjunction with a laser weld seam tracking system to achieve high-precision welding. This process is suitable for materials such as carbon steel, stainless steel, and aluminum alloys (thickness 0.8-3mm), using a 90-130A pulsed current and Ar / CO2 mixed gas protection, with a welding speed of up to 1.5m / min. Key advantages include controllable penetration depth, a 90% reduction in spatter, and integrated real-time penetration monitoring and heat input management (linear energy ≤0.8kJ / mm), ensuring no burn-through deformation in thin-walled tubes (e.g., Φ25×1.2mm). The weld seam meets ISO 5817-B standards, reducing single-piece welding time to within 3 minutes and increasing the yield to over 99%.

[0003] During the automatic arc welding of chair metal frames, a positioning clamp is required to position and hold the chair metal frame to adapt to automatic arc welding. However, the existing universal positioning clamp only clamps from two directions towards the middle, which cannot adapt well to the different shapes, styles and sizes of chair metal frames. For example, the single-column rotating base of the chair metal frame and the multi-hinge structure of the folding chair require customized fixtures. The universal positioning clamp cannot be compatible with irregular joints with curved surface angles of less than 15 degrees.

[0004] Therefore, an automatic arc welding device for chair metal frames is proposed to solve the above problems. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] The purpose of this invention is to provide an automatic arc welding device for chair metal frames, which aims to solve the problem that existing universal positioning clamping frames only clamp from two directions toward the middle, and cannot effectively adapt to the clamping of chair metal frames of different shapes, styles and sizes.

[0007] (II) Technical Solution

[0008] Specifically: An automatic arc welding device for chair metal frames includes an automatic arc welding frame for automatically arc welding chair metal frames conveyed on a conveyor belt. One end of the automatic arc welding frame is equipped with an arc welding head for automatic arc welding, and the other end is equipped with a positioning and clamping assembly for adaptively holding the chair metal frame. The positioning and clamping assembly includes a guide groove, a guide plate, and two multi-section clamping arms. The guide groove is formed on the guide plate and distributed along the main body of the guide plate. The two multi-section clamping arms... The multi-section clamping arms are symmetrically assembled on the guide plate; the multi-section clamping arms are slidably assembled on the guide groove and can be controlled to move on the guide groove by an electric telescopic rod; wherein, the multi-section clamping arms include multiple unit clamping arms, which are assembled end to end; each unit clamping arm includes a multi-level clamping plate and a joint, the multi-level clamping plate is used to act on the chair metal frame to be welded, and to clamp the chair metal frame to be welded; the joint is assembled on the multi-level clamping plate; the joint is used to adjust the rotation angle of the multi-level clamping plate in the transverse and / or longitudinal directions;

[0009] The conveyor belt transports the chair frame to be welded to the automatic arc welding frame. The automatic arc welding frame uses an electric telescopic rod on a positioning clamping assembly attached to one end. The electric telescopic rod controls two multi-section clamping arms symmetrically assembled on a guide plate to move towards each other, clamping the chair frame to be welded. This completes the adaptive clamping of the chair frame by the positioning clamping assembly. The automatic arc welding frame then uses an arc welding head attached to the other end to perform automatic arc welding on the chair frame. During the process of the multi-section clamping arms acting on the chair frame to be welded, multiple or more sections of the multiple clamping arms can adjust the rotation angle of the multi-level clamping plates in the horizontal, vertical, or combined horizontal and vertical directions through joints. This allows for excellent adaptive clamping of chair frames of different shapes, styles, and sizes, such as the single-column rotating base of the chair frame and the curved irregular joint of the multi-hinge structure of the folding chair.

[0010] The technical solution of this application will be further described below:

[0011] In one embodiment, the automatic arc welding frame includes a support beam, an arc welding head and a positioning clamping assembly distributed at both ends of the support beam; the arc welding head and the positioning clamping assembly are respectively mounted on the support beam by a robotic arm.

[0012] In one embodiment, the robotic arm includes:

[0013] Support base, assembled at the end of the supporting beam;

[0014] The lifting platform is assembled at the end of the support base.

[0015] Furthermore, the robotic arm also includes:

[0016] A horizontal telescopic arm is installed horizontally on the lifting platform; the horizontal telescopic arm is perpendicular to the lifting platform.

[0017] A longitudinal telescopic arm is mounted longitudinally on a transverse telescopic arm; the longitudinal telescopic arm and the transverse telescopic arm are perpendicularly distributed.

[0018] A second horizontal telescopic arm is mounted horizontally on a first longitudinal telescopic arm; the second horizontal telescopic arm and the first longitudinal telescopic arm are distributed perpendicularly to each other.

[0019] The second longitudinal telescopic arm is mounted longitudinally on the second transverse telescopic arm; the second longitudinal telescopic arm and the second transverse telescopic arm are distributed perpendicularly.

[0020] Furthermore, hydraulic telescopic rods are installed on the first horizontal telescopic arm, the first vertical telescopic arm, the second horizontal telescopic arm, and the second vertical telescopic arm; motors are installed on the first horizontal telescopic arm and the second horizontal telescopic arm, and the motors are used to drive the first horizontal telescopic arm and the second horizontal telescopic arm to rotate.

[0021] In one embodiment, the multi-stage clamping plate includes:

[0022] A main clamping plate is assembled on the joint; the main clamping plate has multiple through cavities.

[0023] Multiple secondary clamping plates correspond one-to-one with multiple insertion cavities; each secondary clamping plate is movably inserted into the insertion cavity, and a spring is fixed at the end of the secondary clamping plate, with the spring located at the bottom of the insertion cavity.

[0024] Electromagnetic coils are laid on both the outer surface of the secondary clamping plate and the inner surface of the insertion cavity.

[0025] Therefore, when the energization of the electromagnetic coil 1 laid on the outer surface of the secondary clamping plate and the inner surface of the insertion cavity is disconnected, the electromagnetic coil 1 loses its magnetism. During the process of the multi-level clamping plate acting on the chair metal frame to be welded, the multi-level clamping plate can be moved into the insertion cavity through one or more local secondary clamping plates, so that the multi-level clamping plate can adapt to the shape of the chair metal frame surface with a more suitable concave shape. At this time, the electromagnetic coil 1 is energized again to make it magnetically attracted.

[0026] In one embodiment, the joint includes:

[0027] Two support plates are fixed to the ends of two adjacent multi-stage clamping plates, respectively;

[0028] A rotation drive component is assembled between the two support plates; the rotation drive component is used to drive the two support plates to rotate relative to each other.

[0029] Furthermore, the rotation drive includes:

[0030] The upper rotating column is fixed to one of the two support plates;

[0031] The lower rotating column is fixed to the other of the two support plates.

[0032] Furthermore, the lower rotating column has a placement cavity, inside which are two main drive stages arranged in a circular array; a bearing seat is provided at the center of the placement cavity column located inside the main drive stages; a driven column is provided on the upper rotating column, located at the center of the upper rotating column; the driven column includes:

[0033] The locating pin is rotatably mounted on the bearing housing;

[0034] A positioning sleeve is fitted and fixed to the outside of the positioning post;

[0035] Two magnetic adsorption plates are fixed to the positioning sleeve; the two magnetic adsorption plates are arranged in an array around the positioning sleeve and are located in the gap between the two main drive stages.

[0036] Electromagnetic coils are installed on the side of the main drive platform and on the magnetic adsorption plate; the magnetic adsorption plate and the main drive platform are connected by a buffer spring.

[0037] Furthermore, a rotating structure is fixed on one of the support plates, and the rotating structure is fixed at the end of the multi-stage clamping plate; the rotating structure includes a rotary motor, which is used to drive two adjacent multi-stage clamping plates to rotate.

[0038] Therefore, starting the rotary motor causes the two adjacent multi-stage clamping plates to rotate longitudinally. Energizing the electromagnetic coils on the side of the main drive platform and the magnetic adsorption plate makes the magnetic adsorption plate and the main drive platform magnetic, causing them to move closer together. This causes the upper and lower rotating columns to rotate relative to each other, compressing the buffer springs and thus rotating the two adjacent multi-stage clamping plates laterally. This allows for the adjustment of the rotation angle of the multi-stage clamping plates in one or more parts of multiple unit clamping arms, through joints in the lateral, longitudinal, or combined lateral and longitudinal directions. This enables adaptive clamping of chair metal frames of different shapes, styles, and sizes, such as the curved joints of a single-column rotating base of a chair metal frame and the multi-hinge structure of a folding chair.

[0039] (III) Beneficial Effects

[0040] Compared with existing technologies, the automatic arc welding device for chair metal frames of the present invention can achieve the following:

[0041] 1. The conveyor belt transports the chair metal frame to be welded to the automatic arc welding frame. The automatic arc welding frame uses an electric telescopic rod on a positioning clamping assembly attached to one end. The electric telescopic rod controls two multi-section clamping arms symmetrically mounted on guide plates to move towards each other, clamping the chair metal frame to be welded. This completes the adaptive clamping of the chair metal frame by the positioning clamping assembly. The automatic arc welding frame then uses an arc welding head attached to its other end to perform automatic arc welding on the chair metal frame. While the multi-section clamping arms are acting on the chair metal frame to be welded, the rotary motor is started, causing the rotary motor to drive the two adjacent multi-stage clamping plates to rotate in the longitudinal direction, which is the main drive. The energization of the electromagnetic coils on the side of the moving platform and the magnetic adsorption plate makes the magnetic adsorption plate and the main drive platform magnetic and bring them close together, causing the upper and lower rotating columns to rotate relative to each other, compressing the buffer springs, and driving the two adjacent multi-stage clamping plates to rotate in the lateral direction. This is beneficial for multiple clamping arms, where multiple or more clamping arms can be used to adjust the rotation angle of the multi-stage clamping plates in the lateral, longitudinal, or combined lateral and longitudinal directions through the joints. This allows for adaptive clamping of chair metal frames of different shapes, styles and sizes, such as the single-column rotating base of the chair metal frame and the curved joint of the multi-hinge structure of the folding chair.

[0042] 2. Disconnect the energization of the electromagnetic coil one laid on the outer surface of the secondary clamping plate and the inner surface of the insertion cavity. The electromagnetic coil one loses its magnetism. During the process of the multi-level clamping plate acting on the chair metal frame to be welded, the multi-level clamping plate can be moved into the insertion cavity through one or more local secondary clamping plates, so that the multi-level clamping plate can adapt to the shape of the chair metal frame surface with a more suitable concave shape. At this time, the electromagnetic coil one is energized again to make it magnetically attracted. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the automatic arc welding device for a chair metal frame according to one embodiment of the present invention;

[0044] Figure 2 This is a schematic diagram of the structure of an automatic arc welding frame in one embodiment of the present invention;

[0045] Figure 3 This is a schematic diagram of the structure of a robotic arm in one embodiment of the present invention;

[0046] Figure 4 This is a schematic diagram of the positioning and clamping assembly in one embodiment of the present invention;

[0047] Figure 5 This is a schematic diagram of the structure of a multi-section clamping arm in one embodiment of the present invention;

[0048] Figure 6 This is a schematic diagram of the structure of a unit clamping arm in one embodiment of the present invention;

[0049] Figure 7 This is a schematic diagram of the structure of a multi-level clamping plate in one embodiment of the present invention;

[0050] Figure 8 This is a schematic diagram of the joint structure in one embodiment of the present invention;

[0051] Figure 9 This is a schematic diagram of the structure of a rotation drive component in one embodiment of the present invention;

[0052] Figure 10 for Figure 9 Schematic diagram of the middle and lower rotating column and the driven column;

[0053] Figure 11 This is a schematic diagram of the joint structure in another embodiment of the present invention.

[0054] In the attached diagram:

[0055] 1. Drive belt; 2. Automatic arc welding frame;

[0056] Robotic arm 21, arc welding head 22, erection beam 23, positioning and clamping assembly 24;

[0057] Support base 211, lifting platform 212, horizontal telescopic arm 1 213, vertical telescopic arm 1 214, horizontal telescopic arm 2 215, vertical telescopic arm 2 216; guide groove 241, guide plate 242, multi-section clamping arm 243, unit clamping arm 244, multi-stage clamping plate 245, joint 246.

[0058] Main clamping plate 2451, secondary clamping plate 2452; rotating structure 2460, support plate 2461, rotating drive component 2462, upper rotating column 2463, lower rotating column 2464, driven column 2465; main drive platform 24641, bearing seat 24642; positioning sleeve 24651, magnetic adsorption plate 24652, positioning column 24653. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The specific implementation of the invention will be described in detail below with reference to specific embodiments.

[0060] In embodiments of the present invention, such as Figure 1 and Figure 2As shown: Automatic arc welding device for chair metal frame, including automatic arc welding frame 2 for automatically arc welding chair metal frame conveyed on conveyor belt 1, wherein an arc welding head 22 for automatic arc welding is installed at one end of the automatic arc welding frame 2, and a positioning clamping assembly 24 for adaptively clamping the chair metal frame is installed at the other end of the automatic arc welding frame 2.

[0061] Therefore, the chair metal frame to be welded is placed at one end of the conveyor belt 1, and the chair metal frame to be welded is transported to the position of the automatic arc welding frame 2 by the conveyor belt 1. The automatic arc welding frame 2 uses the positioning clamping assembly 24 attached to one end to adapt to clamp the chair metal frame, and the automatic arc welding frame 2 uses the arc welding head 22 attached to the other end to perform automatic arc welding on the chair metal frame to be welded.

[0062] It should also be noted that: the transmission belt 1 is existing technology, which can be purchased on the market and can be found in existing literature; it is not the technology that this application seeks to protect, so it will not be discussed in detail here.

[0063] like Figure 4 As shown: The positioning and clamping assembly 24 includes:

[0064] Guide plate 242;

[0065] Guide grooves 241 are formed on the guide plate 242 and distributed along the main body of the guide plate 242;

[0066] Two multi-section clamping arms 243 are symmetrically mounted on the guide plate 242; the multi-section clamping arms 243 are slidably mounted on the guide groove 241 and can be controlled to move on the guide groove 241 by an electric telescopic rod.

[0067] Therefore, when the conveyor belt 1 transports the chair metal frame to be welded to the position of the automatic arc welding frame 2, the positioning clamping assembly 24 starts the electric telescopic rod to control the two multi-section clamping arms 243, which are symmetrically assembled on the guide plate 242, to move towards each other, clamp the chair metal frame to be welded, and complete the automatic arc welding of the chair metal frame to be welded.

[0068] It should also be noted that: the electric telescopic rod is laid inside the guide groove 241 and distributed along the opening direction of the guide groove 241; the electric telescopic rod is existing technology and can be purchased on the market and can be found in existing literature; it is not the subject of this application and will not be described in detail here.

[0069] Meanwhile, the electric telescopic rod can be replaced by a hydraulic telescopic rod, or even a pneumatic telescopic rod, etc. The specific structure is not limited, as long as it can control the two multi-section clamping arms 243, which are symmetrically assembled on the guide plate 242, to move towards each other and clamp the metal frame of the chair to be welded; here, the electric telescopic rod is preferred.

[0070] Among them, such as Figures 5-8 As shown: The multi-section clamping arm 243 includes multiple unit clamping arms 244, which are assembled end-to-end; each unit clamping arm 244 includes:

[0071] The multi-stage clamping plate 245 is used to clamp the metal frame of the chair to be welded.

[0072] Joint 246 is mounted on the multi-stage clamping plate 245; the joint 246 is used to adjust the rotation angle of the multi-stage clamping plate 245 in the lateral and / or longitudinal directions.

[0073] Therefore, when the conveyor belt 1 transports the chair metal frame to be welded to the position of the automatic arc welding frame 2, the automatic arc welding frame 2 uses an electric telescopic rod on a positioning clamping assembly 24 attached to one end. The electric telescopic rod controls two multi-section clamping arms 243 symmetrically mounted on a guide plate 242 to move towards each other, clamping the chair metal frame to be welded. This completes the adaptive clamping of the positioning clamping assembly 24 to the chair metal frame, and the automatic arc welding frame 2 uses an arc welding head 22 attached to the other end to weld the chair metal frame. The frame is subjected to automatic arc welding; during the process of the multi-section clamping arm 243 acting on the chair metal frame to be welded, one or more parts of the multiple unit clamping arms 244 can adjust the rotation angle of the multi-level clamping plate 245 in the horizontal, vertical, or combined horizontal and vertical directions through the joint 246, so as to achieve good adaptive clamping for chair metal frames of different shapes, styles and sizes, such as the single column rotating base of the chair metal frame and the curved irregular joint of the multi-hinge structure of the folding chair.

[0074] This solves the problem that existing universal positioning clamps only clamp from two directions toward the middle, and cannot effectively clamp metal chair frames of different shapes, styles and sizes.

[0075] In another embodiment of the present invention, such as Figure 2 and Figure 3 As shown: The automatic arc welding frame 2 includes a support beam 23, an arc welding head 22 and a positioning clamping assembly 24 distributed at both ends of the support beam 23; the arc welding head 22 and the positioning clamping assembly 24 are respectively mounted on the support beam 23 by a robotic arm 21.

[0076] In another embodiment of the present invention, such as Figure 3 As shown: The robotic arm 21 includes:

[0077] Support base 211 is assembled at the end of the supporting crossbeam 23;

[0078] The lifting platform 212 is assembled at the end of the support base 211.

[0079] In another embodiment of the present invention, such as Figure 3 As shown: The robotic arm 21 also includes:

[0080] A horizontal telescopic arm 213 is horizontally mounted on the lifting platform 212; the horizontal telescopic arm 213 is perpendicular to the lifting platform 212.

[0081] A longitudinal telescopic arm 214 is longitudinally mounted on a transverse telescopic arm 213; the longitudinal telescopic arm 214 and the transverse telescopic arm 213 are perpendicularly distributed.

[0082] A second lateral telescopic arm 215 is mounted laterally on a first longitudinal telescopic arm 214; the second lateral telescopic arm 215 and the first longitudinal telescopic arm 214 are perpendicularly distributed.

[0083] The longitudinal telescopic arm 216 is mounted longitudinally on the transverse telescopic arm 215; the longitudinal telescopic arm 216 and the transverse telescopic arm 215 are perpendicularly distributed.

[0084] In another embodiment of the present invention, such as Figure 3 As shown: Hydraulic telescopic rods are installed on the first transverse telescopic arm 213, the first longitudinal telescopic arm 214, the second transverse telescopic arm 215, and the second longitudinal telescopic arm 216.

[0085] Motors are installed on the first horizontal telescopic arm 213 and the second horizontal telescopic arm 215. The motors are used to drive the first horizontal telescopic arm 213 and the second horizontal telescopic arm 215 to rotate.

[0086] In another embodiment of the present invention, such as Figure 7 As shown: The multi-stage clamping plate 245 includes:

[0087] The main clamping plate 2451 is assembled on the joint 246; the main clamping plate 2451 has multiple through cavities.

[0088] Multiple secondary clamping plates 2452 correspond one-to-one with multiple insertion cavities; the secondary clamping plates 2452 are movably inserted into the insertion cavities, and springs are fixed at the ends of the secondary clamping plates 2452, with the springs located at the bottom of the insertion cavities.

[0089] Electromagnetic coils are laid on both the outer surface of the secondary clamping plate 2452 and the inner surface of the insertion cavity.

[0090] Therefore, when the energization of the electromagnetic coil 1 laid on the outer surface of the secondary clamping plate 2452 and the inner surface of the insertion cavity is disconnected, the electromagnetic coil 1 loses its magnetism. During the process of the multi-level clamping plate 245 acting on the chair metal frame to be welded, the multi-level clamping plate 245 can be movably inserted into the insertion cavity through one or more secondary clamping plates 2452 in one local area, so that the multi-level clamping plate 245 can adapt to the shape of the chair metal frame surface with a more suitable concave shape. At this time, the electromagnetic coil 1 is energized again to make it magnetically attracted.

[0091] The wiring method for the first electromagnetic coil is existing technology, which can be obtained from literature or assembled by purchasing parts on the market; it is not the subject of this invention and will not be described in detail here.

[0092] In another embodiment of the present invention, such as Figure 6 and Figure 8 As shown: The joint 246 includes:

[0093] Two support plates 2461 are fixed to the ends of two adjacent multi-stage clamping plates 245, respectively;

[0094] A rotation drive component 2462 is assembled between the two support plates 2461; the rotation drive component 2462 is used to drive the two support plates 2461 to rotate relative to each other.

[0095] In another embodiment of the present invention, such as Figure 9 and Figure 10 As shown: The rotation drive component 2462 includes:

[0096] The upper rotating column 2463 is fixed on one of the two support plates 2461;

[0097] The lower rotating column 2464 is fixed on the other support plate 2461 of the two support plates 2461.

[0098] In another embodiment of the present invention, such as Figure 9 and Figure 10 As shown: A placement cavity is formed on the lower rotating column 2464, and two main drive stages 24641 are arranged in a ring array inside the placement cavity; a bearing seat 24642 ​​is provided at the center of the placement cavity located inside the main drive stages 24641; a driven column 2465 is provided on the upper rotating column 2463, and the driven column 2465 is located at the center of the upper rotating column 2463; the driven column 2465 includes:

[0099] Positioning pin 24653 is rotatably mounted on bearing housing 24642;

[0100] Positioning sleeve 24651 is fitted and fixed to the outside of positioning post 24653;

[0101] Two magnetic adsorption plates 24652 are fixed on the positioning sleeve 24651; the two magnetic adsorption plates 24652 are arrayed around the positioning sleeve 24651 and are located in the gap between the two main drive stages 24641.

[0102] Electromagnetic coils are laid on one side of the main drive platform 24641 and on the magnetic adsorption plate 24652; the magnetic adsorption plate 24652 and the main drive platform 24641 are connected by a buffer spring.

[0103] The wiring method for the second electromagnetic coil is existing technology, which can be obtained from literature or assembled by purchasing parts on the market; it is not the subject of this invention and will not be described in detail here.

[0104] In another embodiment of the present invention, such as Figure 11 As shown: A rotating structure 2460 is fixed on a support plate 2461. The rotating structure 2460 is fixed at the end of the multi-stage clamping plate 245. The rotating structure 2460 includes a rotating motor, which is used to drive two adjacent multi-stage clamping plates 245 to rotate.

[0105] Therefore, starting the rotary motor causes the two adjacent multi-stage clamping plates 245 to rotate in the longitudinal direction. The electromagnetic coils energized on the side of the main drive platform 24641 and the magnetic adsorption plate 24652 make the magnetic adsorption plate 24652 and the main drive platform 24641 magnetic and bring them closer together. This causes the upper rotating column 2463 and the lower rotating column 2464 to rotate relative to each other, compressing the buffer spring and completing the rotation of the two adjacent multi-stage clamping plates 245 in the lateral direction. This is beneficial for adjusting the rotation angle of the multi-stage clamping plates 245 in one or more parts of the multiple unit clamping arms 244 through the joints 246 in the lateral, longitudinal, or combined lateral and longitudinal directions. This allows for adaptive clamping of chair metal frames of different shapes, styles and sizes, such as the single-column rotating base of the chair metal frame and the curved joint of the multi-hinge structure of the folding chair.

[0106] This solves the problem that existing universal positioning clamps only clamp from two directions toward the middle, and cannot effectively clamp metal chair frames of different shapes, styles and sizes.

[0107] In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0108] In the description of this invention, although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic arc welding device for chair metal frames, comprising an automatic arc welding frame for automatically arc welding chair metal frames conveyed on a conveyor belt, characterized in that, The automatic arc welding frame is equipped with an arc welding head for automatic arc welding at one end, and a positioning clamping assembly for adaptively clamping the metal frame of the chair at the other end. The positioning and clamping assembly includes: Guide plate; Guide grooves are formed on the guide plate and distributed along the main body of the guide plate; Two multi-section clamping arms are symmetrically assembled on the guide plate; the multi-section clamping arms are slidably assembled on the guide groove and can be controlled to move on the guide groove by an electric telescopic rod; The multi-section clamping arm comprises multiple unit clamping arms, which are assembled sequentially end-to-end; each unit clamping arm includes: Multi-level clamping plates are used to clamp the metal frame of the chair to be welded. A joint is fitted onto the multi-stage clamping plate; the joint is used to adjust the rotation angle of the multi-stage clamping plate in the lateral and / or longitudinal directions. The joint includes: Two support plates are fixed to the ends of two adjacent multi-stage clamping plates, respectively; A rotation drive component is assembled between the two support plates; the rotation drive component is used to drive the two support plates to rotate relative to each other. The rotation drive component includes: The upper rotating column is fixed to one of the two support plates; The lower rotating column is fixed to the other of the two support plates; The lower rotating column has a placement cavity, inside which are two main drive stages arranged in a circular array. A bearing seat is located at the center of the placement cavity column, inside the main drive stages. A driven column is located on the upper rotating column, at its center. The driven column includes: The locating pin is rotatably mounted on the bearing housing; A positioning sleeve is fitted and fixed to the outside of the positioning post; Two magnetic adsorption plates are fixed to the positioning sleeve; the two magnetic adsorption plates are arranged in an array around the positioning sleeve and are located in the gap between the two main drive stages. Among them, electromagnetic coils are laid on the side of the main drive platform and the magnetic adsorption plate; the magnetic adsorption plate and the main drive platform are connected by a buffer spring. The multi-level clamping plate includes: A main clamping plate is assembled on the joint; the main clamping plate has multiple through cavities. Multiple secondary clamping plates correspond one-to-one with multiple insertion cavities; each secondary clamping plate is movably inserted into the insertion cavity, and a spring is fixed at the end of the secondary clamping plate, with the spring located at the bottom of the insertion cavity. Electromagnetic coils are laid on both the outer surface of the secondary clamping plate and the inner surface of the insertion cavity.

2. The automatic arc welding device for chair metal frames according to claim 1, characterized in that, The automatic arc welding frame includes a support beam, an arc welding head and a positioning clamping assembly distributed at both ends of the support beam; the arc welding head and the positioning clamping assembly are respectively mounted on the support beam by robotic arms.

3. The automatic arc welding device for chair metal frames according to claim 2, characterized in that, The robotic arm includes: Support base, assembled at the end of the supporting beam; The lifting platform is assembled at the end of the support base.

4. The automatic arc welding device for chair metal frames according to claim 3, characterized in that, The robotic arm also includes: A horizontal telescopic arm is installed horizontally on the lifting platform; the horizontal telescopic arm is perpendicular to the lifting platform. A longitudinal telescopic arm is mounted longitudinally on a transverse telescopic arm; the longitudinal telescopic arm and the transverse telescopic arm are perpendicularly distributed. A second horizontal telescopic arm is mounted horizontally on a first longitudinal telescopic arm; the second horizontal telescopic arm and the first longitudinal telescopic arm are distributed perpendicularly to each other. The second longitudinal telescopic arm is mounted longitudinally on the second transverse telescopic arm; the second longitudinal telescopic arm and the second transverse telescopic arm are distributed perpendicularly.

5. The automatic arc welding device for chair metal frames according to claim 4, characterized in that, Hydraulic telescopic rods are installed on the first horizontal telescopic arm, the first longitudinal telescopic arm, the second horizontal telescopic arm, and the second longitudinal telescopic arm. Motors are installed on both the first and second horizontal telescopic arms, which are used to drive the first and second horizontal telescopic arms to rotate.

6. The automatic arc welding device for chair metal frames according to claim 1, characterized in that, A rotating structure is fixed on one of the support plates, and the rotating structure is fixed at the end of the multi-stage clamping plate; the rotating structure includes a rotary motor, which is used to drive two adjacent multi-stage clamping plates to rotate.

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