Metal chair frame welding positioning tool

Abstract

The invention relates to the technical field of welding tools, and discloses a metal chair frame welding and positioning tool which comprises a base, an adjusting part is arranged on the base, a supporting part is connected to the adjusting part, a first positioning part is arranged on the supporting part, a second positioning part is arranged on the first positioning part, a clamping part is connected to the supporting part, and the clamping part is connected to the adjusting part. The supporting part comprises a supporting plate, the supporting plate is of an L-shaped structure, the first positioning part comprises hinge plates, the number of the hinge plates is two, the two hinge plates are symmetrically connected to the supporting plate, supporting arms are hinged to the two hinge plates through plug pins, magnetic attraction fixing of the first positioning part is adopted, an attraction piece and a magnet attract each other, and the supporting plate and the first positioning part attract each other. Elastic clamping of the clamping part replaces a traditional spot welding fixing mode, the welding adhesion risk of the tool and the workpiece is eliminated from the source, only magnetic attraction separation and clamping block pulling are needed during dismounting, cutting or knocking of an angle grinder is not needed, workpiece surface scratching and deformation and main welding seam damage are avoided, and the rejection rate is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding tooling, in particular to a metal chair frame welding positioning tooling. BACKGROUND

[0002] In the field of metal furniture manufacturing, the welding quality of the metal chair frame, which is the core load-bearing structure of the chair, directly determines the stability, safety and service life of the product. The metal chair frame is usually made of steel pipes, steel plates and other profiles through welding. During the welding process, the relative position accuracy of each component needs to be ensured to ensure smooth subsequent assembly and the aesthetic degree of the finished product. Therefore, welding positioning tooling, as a key auxiliary equipment for precise positioning, is indispensable in the mass production of metal chair frames.

[0003] The existing metal chair frame welding positioning tooling usually combines positioning blocks, clamping devices and support structures to temporarily fix the components of the chair frame. To prevent the workpiece from shifting due to thermal deformation or external forces during welding, the fixing method of the tooling and the chair frame skeleton often uses mechanical clamping combined with local spot welding assistance, that is, the tooling positioning piece is temporarily connected to the chair frame skeleton through spot welding, and then the tooling is removed after the main weld is completed. However, in actual production, it is not uncommon for the tooling and the chair frame skeleton to be welded together and difficult to separate due to welding processing, which has become a prominent pain point restricting production efficiency and product quality.

[0004] Specifically, the operator often spot welds the contact parts of the tooling positioning piece and the chair frame skeleton, but due to the lack of precise weld design, it is easy to have too large welds and too deep weld penetration, resulting in a firm fusion of the tooling and the skeleton. Especially when the gap between the tooling positioning piece and the skeleton is too small or completely adhered, welding spatter and slag will seep into the gap and solidify, further exacerbating the adhesion of the two, eventually forming a welded state.

[0005] The positioning blocks and clamping pieces of the existing positioning tooling often use a monolithic structure, and the contact surface with the chair frame skeleton is a continuous plane or curved surface without anti-adhesion structures such as welding avoidance grooves and separation gaps. During welding, the high-temperature molten pool is easy to spread along the contact surface, expanding the connection area of the tooling and the skeleton. Meanwhile, some toolings are designed with multi-directional closed clamping to pursue positioning accuracy, making it difficult for tools to reach the contact points when disassembling, and forcibly prying may cause tool deformation or damage to the chair frame skeleton.

[0006] When the tooling and the chair frame skeleton are welded together, they need to be forcibly separated by methods such as angle grinder cutting, gas cutting or chisel knocking, which not only increases additional working hours, but also may cause scratches, deformation or even damage to the completed main weld on the surface of the chair frame skeleton, leading to an increase in scrap rate. In addition, frequent forced disassembly will accelerate the wear of the tooling positioning piece, shorten the service life of the tooling, and increase equipment maintenance costs.

[0007] To sum up, the existing metal chair frame welding positioning tooling has unreasonable structural design and rough temporary fixing methods, which leads to widespread problems such as welding adhesion between the tooling and the chair frame and difficulty in removal, seriously affecting production efficiency, product quality and production costs. Therefore, a metal chair frame welding positioning tooling is proposed to solve the above-mentioned problems. Summary of the Invention

[0008] (1) Technical problems solved

[0009] In response to the shortcomings of the existing technology, the present invention provides a metal chair frame welding positioning tool, which solves the problem that the metal chair frame welding positioning tool and the frame are easily adhered and welded together, and it is difficult for the tool to reach the contact point of the tool after welding. Forced separation will cause damage to the tool and the frame, thereby shortening the service life of the tool.

[0010] (2) Technical solution

[0011] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a metal chair frame welding positioning tool, comprising a base, an adjustment part is provided on the base, a support part is connected to the adjustment part, a positioning part 1 is provided on the support part, a positioning part 2 is provided on the positioning part 1, a clamping part is connected to the support part, the support part comprises a support plate, the support plate is an L-shaped structure, the positioning part 1 comprises a hinge plate, there are two hinge plates, the two hinge plates are symmetrically connected to the support plate, the two hinge plates are hinged with support arms through pins, positioning holes are provided on the two support arms, the ends of the two support arms are connected to adsorption plates, the two ear ends of the support plate are provided with card slots, the two card slots are connected with magnets, and each of the magnets is attracted to the adsorption plate adjacent to itself by opposite sex.

[0012] Preferably, the second positioning part includes two grooves, which are symmetrically opened on the two ear ends of the support plate. The inner walls of the two grooves are slidably connected with compensation blocks, and the compensation blocks are L-shaped structures. Each compensation block is elastically connected to the inner wall of the groove with spring 2.

[0013] Preferably, the adjustment portion includes an adjustment slot, which is located in the middle of the base. Four sliding slots are symmetrically provided on the base, and sliding holes are provided in the four sliding slots. Four limiting holes are symmetrically provided in the adjustment slot, and the four limiting holes are staggered with the four sliding slots. A baffle is installed on the base, and a through hole is provided on the baffle.

[0014] Preferably, the adjusting part also includes a screw, which is rotatably connected to the center of the adjusting groove, and the end of the screw moves through the through hole on the baffle and is fixedly connected to the handwheel. An adjusting table is slidably connected in the adjusting groove, and four limit plates are fixedly connected to the adjusting table. The four limit plates are slidably connected to the four limit holes respectively.

[0015] Preferably, the support part also includes a sliding arm, which is slidably connected to the inner wall of one of the slide grooves, one end of the sliding arm slides through the sliding hole and is fixedly connected to the support plate, the support plate is fixedly connected to the support plate, the other end of the sliding arm is an arc structure and fits between the adjusting table, a protrusion is connected to the sliding arm, and a spring is elastically connected between the protrusion and the slide groove.

[0016] Preferably, the positioning part one and the positioning part two form a positioning compensation mechanism, and the number of the positioning compensation mechanisms and the number of the supporting parts are four, and the four positioning compensation mechanisms are respectively installed on four supporting parts, and every two positioning compensation mechanisms are arranged symmetrically with each other.

[0017] Preferably, the four sliding arms in the four supporting parts are respectively arranged in four sliding grooves, and the arc surface ends of the four sliding arms are all in contact with the adjusting table.

[0018] Preferably, the clamping part includes two positioning arms, and the two positioning arms are respectively installed on two support plates on the same side. A guide groove is provided on the two positioning arms, and a guide block is provided in each guide groove. A clamping block is connected to each guide block, and each guide block is elastically connected to the inner wall of the guide groove by a tension spring.

[0019] Preferably, a chair frame connector is provided on the support plate, and the two compensation blocks in each of the second positioning parts respectively abut against a corner of the inner wall of the chair frame connector, the chair frame connector is fitted with the four support plates, welding plates are welded on both sides of the chair frame connector, and a chair seat is installed on the chair frame connector.

[0020] Preferably, there are two clamping parts, and the other clamping part is installed on the two support plates on the other side. The two clamping parts are symmetrically arranged with each other, and the two clamping blocks in each clamping part clamp the chair legs with the welding pieces on the same side, and the two chair legs are respectively welded to the connected welding pieces.

[0021] (3) Beneficial effects

[0022] Compared with the prior art, the present invention provides a metal chair frame welding positioning tool, which has the following beneficial effects:

[0023] 1. The metal chair frame welding positioning fixture adopts magnetic fixation in the positioning part. The adsorption sheet and the magnet are attracted by opposite charges, and the elastic clamping of the clamping part replaces the traditional spot welding fixation method, eliminating the risk of welding adhesion between the fixture and the workpiece from the source. When dismantling, you only need to separate the magnetic attraction and pull the clamping block. There is no need to cut or knock with an angle grinder, which avoids scratches, deformation of the workpiece surface and damage to the main weld, thereby reducing the scrap rate.

[0024] 2. The metal chair frame welding positioning fixture adopts an L-shaped compensation block in the positioning part 2, which is elastically connected to the groove through spring 2. It can automatically abut the inner wall corners of the chair frame connector to compensate for the gap caused by processing errors, ensure that workpieces of different sizes fit tightly with the support plate, and solve the problem of loose or overtight positioning caused by the one-size-fits-all positioning of traditional positioning blocks, thereby improving the positioning accuracy consistency of each workpiece in mass production.

[0025] 3. The metal chair frame welding positioning tool adopts a clamping part that drives the clamping block to slide along the guide groove through a tension spring to form an elastic clamping force. It can not only stably clamp the connection between the chair leg and the welding piece, but also avoid deformation of the workpiece caused by rigid extrusion. At the same time, with the synchronous spacing adjustment of the adjustment part, it can adapt to chair legs of different lengths and diameters, thereby improving the versatility of the tooling.

[0026] 4. The metal chair frame welding positioning fixture adopts an adjustment part that drives the adjustment table through a screw to achieve synchronous spacing adjustment of the four support parts, ensuring the center positioning accuracy of the chair frame connector. The adjustable support arm of the positioning part is inserted into the pin through the positioning hole, and cooperates with the L-shaped structure of the support plate to form multi-directional precise constraints on the connector. The clamping part is symmetrically arranged to ensure the relative position stability of the chair leg and the welding plate. The three work together to effectively avoid lateral offset or angular deviation of the workpiece during welding, thereby improving the weld quality and subsequent assembly accuracy.

[0027] 5. The metal chair frame welding positioning tooling adopts magnetic attraction and elastic structure to reduce the hard friction between the tooling and the workpiece, and each component adopts modular design. After wear, it can be replaced individually without scrapping the entire tooling. At the same time, it avoids the structural deformation caused by forced dismantling of traditional tooling, significantly extends the service life, and reduces equipment maintenance and replacement costs.

[0028] 6. The metal chair frame welding positioning tool uses a handwheel drive in the adjustment part to achieve rapid size adaptation. The positioning part and the clamping part do not require complex tools to operate, reducing the tooling debugging time. Due to its precise positioning and easy disassembly, it avoids additional processes such as repair welding, rework, and scratch repair in traditional processes, significantly improving the welding processing efficiency of a single set of chair frames and is suitable for mass production scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of a metal chair frame welding and positioning tooling proposed by the present invention;

[0030] Figure 2 This is an assembly diagram of a metal chair frame welding positioning tool support portion and a chair frame connecting piece proposed by the present invention;

[0031] Figure 3 This is a connection diagram of the support part, positioning part 1 and positioning part 2 of a metal chair frame welding positioning tool proposed by the present invention;

[0032] Figure 4 This is a connection diagram of the adjustment part, support part and clamping part of the metal chair frame welding positioning tool proposed by the present invention;

[0033] Figure 5 This is a structural schematic diagram of a metal chair frame welding positioning tool base proposed by the present invention;

[0034] Figure 6 This is a structural schematic diagram of an adjusting circular table for a metal chair frame welding positioning tooling proposed by the present invention;

[0035] Figure 7 This is a structural schematic diagram of a metal chair frame welding positioning tool support portion proposed by the present invention;

[0036] Figure 8 This is a structural schematic diagram of the positioning part 1 and the positioning part 2 of a metal chair frame welding positioning tool proposed by the present invention;

[0037] Figure 9 This is a structural schematic diagram of the clamping part of a metal chair frame welding positioning tooling proposed by the present invention.

[0038] In the figure: 1. Base; 2. Adjusting part; 21. Adjusting groove; 22. Slide groove; 23. Slide hole; 24. Limiting hole; 25. Screw; 26. Handwheel; 27. Adjusting table; 28. Limiting plate; 3. Supporting part; 31. Slide arm; 32. Protruding piece; 33. Spring 1; 34. Support plate; 35. Support plate; 4. Positioning part 1; 41. Hinge plate; 42. Support arm; 43. Positioning hole; 44. Adsorption plate; 45. Magnet; 5. Positioning part 2; 51. Groove; 52. Compensating block; 53. Spring 2; 6. Clamping part; 61. Positioning arm; 62. Guide groove; 63. Guide block; 64. Clamping block; 7. Chair frame connector; 8. Welding piece; 9. Chair leg; 10. Seat; 11. Baffle. DETAILED DESCRIPTION

[0039] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] See also Figure 1-9 The present invention provides a technical solution: a metal chair frame welding positioning tool, comprising a base 1, an adjusting part 2 is provided on the base 1, and the synchronous spacing adjustment of the supporting part 3 is achieved through mechanical transmission, which is adapted to metal chair frame connectors 7 of different sizes, providing basic adjustment capabilities for positioning and clamping. The adjusting part 2 is connected to the supporting part 3, which serves as an installation carrier for the positioning structure and the clamping structure, transmits the power of the adjusting part 2 and provides stable support, and at the same time ensures the positioning accuracy through the elastic reset structure. A positioning part 4 is provided on the supporting part 3, which accurately fixes the plane position of the chair frame connector 7 through adjustable mechanical positioning and magnetic suction assistance. To avoid lateral deviation during welding, a positioning part 2 5 is provided on the positioning part 1 4, which eliminates the dimensional error of the chair frame connector 7 through an elastic compensation structure, ensures the fitting accuracy of its corners with the support plate 35, and improves the consistency of welding positioning. A clamping part 6 is connected to the support part 3, which elastically clamps the chair leg 9 and the welding piece 8 to ensure the relative position of the two during the welding process. At the same time, it avoids adhesion of the tooling and the workpiece caused by excessive clamping. The support part 3 includes a support plate 35, and the support plate 35 is an L-shaped structure. The positioning part 1 4 includes a hinge plate 41. There are two hinge plates 41, and the two hinge plates 41 are symmetrically connected to the support On the support plate 35, the two hinge plates 41 are hinged with support arms 42 through pins, and positioning holes 43 are provided on the two support arms 42. The ends of the two support arms 42 are connected with adsorption sheets 44. The two ear ends of the support plate 35 are provided with card slots, and the two card slots are connected with magnets 45. Each magnet 45 is attracted to the adsorption sheet 44 adjacent to itself by opposite sex. The adsorption sheet 44 at the end of the support arm 42 and the magnet 45 on the support plate 35 are attracted by opposite sex to achieve stable fixation of the angle of the support arm 42. The positioning hole 43 can be inserted with an auxiliary positioning pin to further strengthen the precise constraint of the connector. The positioning portion 5 includes two grooves 51 Two grooves 51 are symmetrically opened on the two ear ends of the support plate 35. The inner walls of the two grooves 51 are slidably connected with compensation blocks 52. The compensation blocks 52 are L-shaped structures. Each compensation block 52 is elastically connected to the inner wall of the groove 51 with a second spring 53. The L-shaped compensation block 52 is slidably connected in the groove 51 and is elastically connected to the inner wall of the groove 51 through the second spring 53. When the chair frame connector 7 is placed on the support plate 35, the compensation block 52 abuts against the inner wall corners of the connector under the elastic force of the second spring 53, automatically compensating for the gap caused by processing errors, and ensuring that the connector and the support plate 35 fit tightly.

[0041] In this embodiment, the adjusting portion 2 includes an adjusting groove 21, the adjusting groove 21 is opened in the middle of the base 1, four slide grooves 22 are symmetrically opened on the base 1, and four slide grooves 22 are opened in each of the four slide grooves 23. Four limiting holes 24 are symmetrically opened in the adjusting groove 21, and the four limiting holes 24 are staggered with the four slide grooves 22. A baffle 11 is installed on the base 1, and a through hole is opened on the baffle 11. The adjusting portion 2 also includes a screw 25, which is rotatably connected to the center of the adjusting groove 21, and the end of the screw 25 is movable through the through hole on the baffle 11 and fixedly connected There is a handwheel 26, and an adjusting table 27 is slidably connected in the adjusting groove 21. Four limit plates 28 are fixedly connected to the adjusting table 27. The four limit plates 28 are respectively slidably connected to the four limit holes 24. By turning the handwheel 26, the screw 25 is driven to rotate, and the adjusting table 27 is driven to move axially along the adjusting groove 21. The conical structure of the adjusting table 27 pushes the four sliding arms 31 to move synchronously radially along the slide groove 22 to achieve expansion or contraction of the spacing of the support part 3. The limit plates 28 cooperate with the limit holes 24 to limit the rotation of the adjusting table 27 to ensure adjustment stability.

[0042] It is worth noting that the support portion 3 also includes a sliding arm 31, which is slidably connected to the inner wall of one of the slide grooves 22. One end of the sliding arm 31 slides through the sliding hole 23 and is fixedly connected to a support plate 34. The support plate 34 is fixedly connected to the support plate 35. The other end of the sliding arm 31 is a curved surface structure and fits between the adjustment round table 27. A protrusion 32 is connected to the sliding arm 31, and a spring 1 33 is elastically connected between the protrusion 32 and the slide groove 22. The positioning part 1 4 and the positioning part 2 5 form a positioning compensation mechanism. There are four positioning compensation mechanisms and four support parts 3. The four positioning compensation mechanisms are respectively installed on the four support parts 3. Each two positioning compensation mechanisms are arranged symmetrically with each other. The four sliding arms 31 in the four supporting parts 3 are respectively arranged in the four sliding grooves 22. The arc ends of the four sliding arms 31 are all fitted with the adjusting table 27. One end of the sliding arm 31 is fitted with the adjusting table 27, receives the power of the adjusting part 2 and slides along the sliding groove 22, driving the support plate 34 and the support plate 35 to move synchronously. The spring 1 33 connects the protrusion 32 and the sliding groove 22, and provides elastic tension when the adjusting table 27 is reset, so that the sliding arm 31 returns to its initial position. The L-shaped support plate 35 provides a mounting surface for the positioning part 1 4 and the positioning part 2 5, and at the same time directly fits the chair frame connector 7 to realize basic support.

[0043] It is worth noting that the clamping part 6 includes two positioning arms 61, and the two positioning arms 61 are respectively installed on the two support plates 34 on the same side. A guide groove 62 is provided on the two positioning arms 61, and a guide block 63 is provided in each guide groove 62. A clamping block 64 is connected to each guide block 63. Each guide block 63 is elastically connected to the inner wall of the guide groove 62 in which it is located by a tension spring. A chair frame connector 7 is provided on the support plate 35. The two compensation blocks 52 in each positioning part 2 5 are respectively abutted against a corner of the inner wall of the chair frame connector 7. The chair frame connector 7 fits with the four support plates 35. Welding plates 8 are welded on both sides of the chair frame connector 7. A seat 10 is installed on the chair frame connector 7. There are two holding parts 6, and the other clamping part 6 is installed on the two support plates 34 on the other side. The two clamping parts 6 are symmetrically arranged with each other. The two clamping blocks 64 in each clamping part 6 clamp the chair legs 9 between the welding pieces 8 on the same side. The two chair legs 9 are respectively welded to the connected welding pieces 8. The positioning arm 61 is fixed on the support plate 34, and the guide block 63 slides along the guide groove 62, driving the clamping block 64 to move closer to or away from the welding piece 8. The tension spring connects the guide block 63 and the inner wall of the guide groove 62 to provide continuous clamping force, so that the clamping block 64 stably clamps the connection between the chair leg 9 and the welding piece 8. The elastic clamping design avoids deformation of the workpiece caused by rigid extrusion, while reducing the need for spot welding fixation, which is convenient for later disassembly.

[0044] Working principle: turn the handwheel 26, the screw 25 drives the adjusting table 27 to move axially along the adjusting groove 21, and the conical surface of the adjusting table 27 squeezes the arc ends of the four sliding arms 31, so that the sliding arms 31 slide outward along the sliding groove 22, driving the support plate 34 and the support plate 35 to expand synchronously until the spacing between the four support plates 35 adapts to the size of the chair frame connector 7. The spring 1 33 is in a stretched state at this time, and reserves elastic force for subsequent reset. The limit plate 28 slides along the limit hole 24 to ensure that the adjusting table 27 does not rotate, thereby ensuring the synchronization of the movement of the four sliding arms 31.

[0045] The chair frame connector 7 is placed on the four support plates 35, with its outer wall fitting against the support plates 35, the support arm 42 of the positioning part 1 4 fitting against the edge of the chair frame connector 7, the adsorption sheet 44 and the magnet 45 are attracted to fix the angle of the support arm 42, and a pin is inserted through the positioning hole 43 to strengthen the constraint and prevent the chair frame connector 7 from sliding laterally. The compensation block 52 of the positioning part 2 5 automatically abuts against the four corners of the inner wall of the chair frame connector 7 under the elastic force of the spring 2 53, compensating for the gap caused by the processing error, ensuring the close fit between the chair frame connector 7 and the support plate 35, and avoiding micro-displacement during welding.

[0046] The welding plates 8 on both sides of the chair frame connecting piece 7 need to be welded to the chair legs 9. The chair legs 9 are placed at the preset position of the welding plates 8. The clamping blocks 64 of the clamping part 6 slide along the guide groove 62 under the tension of the tension spring, clamping the chair legs 9 from both sides. The elastic clamping design avoids deformation of the workpiece caused by rigid extrusion. At the same time, there is no need to fix the tooling and the workpiece by spot welding, reducing the risk of welding from the source.

[0047] During the welding process, positioning part 1 4 and positioning part 2 5 ensure the stable position of the connecting part, and the clamping part 6 ensures the accurate relative position of the chair leg 9 and the welding piece 8. Since the fixation of the tooling and the workpiece relies on the magnetic positioning part 1 4 and the elastically clamped positioning part 2 5 and the clamping part 6, rather than spot welding, welding spatter and slag will not cause the tooling and the workpiece to stick together.

[0048] After welding is completed, the hand wheel 26 is rotated in the opposite direction, the adjustment table 27 moves to the left, the spring 1 33 pulls the slide arm 31 to reset, the distance between the four support plates 35 is reduced, and the support for the chair frame connector 7 is separated. The support arm 42 is manually pulled, the adsorption sheet 44 is separated from the magnet 45, and the positioning constraint is released.

[0049] Pull the clamp 64 outward, the tension spring stretches, and the clamp 64 is separated from the chair leg 9, completing the removal of the tooling. The entire process does not require cutting or knocking, avoiding damage to the workpiece or tooling, and solving the problem of difficult removal of traditional tooling.

[0050] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

Claims

1. A metal chair frame welding and positioning tool, comprising a base (1), characterized in that: The base (1) is provided with an adjusting portion (2), the adjusting portion (2) is connected to a supporting portion (3), the supporting portion (3) is provided with a positioning portion (4), the positioning portion (4) is provided with a positioning portion (5), the supporting portion (3) is connected with a clamping portion (6), the supporting portion (3) includes a supporting plate (35), the supporting plate (35) is an L-shaped structure, the positioning portion (4) includes a hinge plate (41), and the number of the hinge plates (41) is two. The two hinge plates (41) are symmetrically connected to the support plate (35), and the two hinge plates (41) are hinged with support arms (42) through pins. The two support arms (42) are provided with positioning holes (43). The ends of the two support arms (42) are connected with adsorption sheets (44). The two ear ends of the support plate (35) are provided with card slots. The two card slots are connected with magnets (45), and each magnet (45) is attracted to the adsorption sheet (44) adjacent to itself by opposite sex.

2. The metal chair frame welding and positioning tool according to claim 1, characterized in that: The second positioning portion (5) includes two grooves (51), and the two grooves (51) are symmetrically opened on the two ear ends of the support plate (35). The inner walls of the two grooves (51) are slidably connected with compensation blocks (52), and the compensation blocks (52) are L-shaped structures. Each compensation block (52) is elastically connected to the inner wall of the groove (51) where it is located by a second spring (53).

3. The metal chair frame welding and positioning tool according to claim 2, characterized in that: The adjusting portion (2) includes an adjusting groove (21), the adjusting groove (21) is opened in the middle of the base (1), four sliding grooves (22) are symmetrically opened on the base (1), and the four sliding grooves (22) are each provided with a sliding hole (23), four limiting holes (24) are symmetrically opened in the adjusting groove (21), and the four limiting holes (24) and the four sliding grooves (22) are staggered, and a baffle (11) is installed on the base (1), and a through hole is opened on the baffle (11).

4. The metal chair frame welding and positioning tool according to claim 3, characterized in that: The adjusting portion (2) further comprises a screw (25), the screw (25) being rotatably connected to the center of the adjusting groove (21), the end of the screw (25) being movable through the through hole on the baffle (11) and being fixedly connected to a hand wheel (26), an adjusting round table (27) being slidably connected in the adjusting groove (21), four limiting plates (28) being fixedly connected to the adjusting round table (27), and the four limiting plates (28) being slidably connected to the four limiting holes (24) respectively.

5. The metal chair frame welding and positioning tool according to claim 4, characterized in that: The support portion (3) further comprises a sliding arm (31), the sliding arm (31) being slidably connected to the inner wall of one of the slide grooves (22), one end of the sliding arm (31) slidingly passes through the slide hole (23) and is fixedly connected to a support plate (34), the support plate (34) and the support plate (35) being fixedly connected, the other end of the sliding arm (31) being an arc surface structure and being fitted with the adjusting round table (27), the sliding arm (31) being connected to a convex piece (32), and a spring (33) being elastically connected between the convex piece (32) and the slide groove (22).

6. The metal chair frame welding and positioning tool according to claim 5, characterized in that: The positioning part 1 (4) and the positioning part 2 (5) form a positioning compensation mechanism. The number of the positioning compensation mechanisms and the number of the supporting parts (3) are four, and the four positioning compensation mechanisms are respectively installed on the four supporting parts (3). Every two positioning compensation mechanisms are symmetrically arranged with respect to each other.

7. The metal chair frame welding and positioning tool according to claim 6, characterized in that: The four sliding arms (31) in the four supporting parts (3) are respectively arranged in the four sliding grooves (22), and the arc surface ends of the four sliding arms (31) are all in contact with the adjusting truncated table (27).

8. The metal chair frame welding and positioning tool according to claim 7, characterized in that: The clamping portion (6) includes two positioning arms (61), and the two positioning arms (61) are respectively installed on two support plates (34) on the same side. The two positioning arms (61) are each provided with a guide groove (62), and each guide groove (62) is provided with a guide block (63). Each guide block (63) is connected to a clamping block (64), and each guide block (63) is elastically connected to the inner wall of the guide groove (62) by a tension spring.

9. The metal chair frame welding and positioning tool according to claim 8, characterized in that: A chair frame connector (7) is provided on the support plate (35), and the two compensation blocks (52) in each positioning portion (5) are respectively abutted against a corner of the inner wall of the chair frame connector (7), and the chair frame connector (7) and the four support plates (35) are fitted together. Welding plates (8) are welded on both sides of the chair frame connector (7), and a chair seat (10) is installed on the chair frame connector (7).

10. The metal chair frame welding and positioning tool according to claim 9, characterized in that: There are two clamping parts (6), and the other clamping part (6) is installed on the two support plates (34) on the other side. The two clamping parts (6) are symmetrically arranged with each other. The two clamping blocks (64) in each clamping part (6) and the welding piece (8) on the same side clamp a chair leg (9), and the two chair legs (9) are respectively welded to the connected welding pieces (8).

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