Metal chair frame welding positioning tool

Abstract

The application relates to the technical field of welding tooling, and discloses a metal chair frame welding positioning tooling, 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, the supporting part comprises a supporting plate, the supporting plate is in an L-shaped structure, the first positioning part comprises a hinged plate, the number of the hinged plates is two, the two hinged plates are symmetrically connected to the supporting plate, a supporting arm is hingedly connected to each of the two hinged plates through a bolt, the first positioning part is fixed through magnetic attraction, the adsorption piece and the magnet are attracted to each other, the elastic clamping of the clamping part replaces a traditional spot welding fixing mode, welding adhesion risks of the tooling and workpieces are eliminated from the source, when the tooling is disassembled, the magnetic attraction only needs to be separated and the clamping block only needs to be pulled, an angle grinder is not needed for cutting or knocking, workpiece surface scratching, deformation and main weld damage are avoided, and the waste product 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 tends to spread along the contact surface, expanding the connection area between the tooling and the skeleton. Meanwhile, some toolings are designed with multi-directional closed clamping to ensure positioning accuracy, but it is difficult for tools to reach the contact points when removing them, and forcibly prying them apart can easily cause deformation of the tooling 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 main weld of the chair frame skeleton, leading to an increase in scrap rate. In addition, frequent forced removal can accelerate the wear of the tooling positioning piece, shorten the service life of the tooling and increase equipment maintenance costs.

[0007] In summary, the existing metal chair frame welding positioning tool is unreasonable in structure design, and the temporary fixing method is rough, which leads to the problems of welding adhesion of the tool and the chair frame skeleton, and difficulty in removal, which seriously affects the production efficiency, product quality and production cost, so a metal chair frame welding positioning tool is proposed to solve the above problems. SUMMARY

[0008] (I) Technical problems solved

[0009] In view of the deficiencies of the prior art, the present application provides a metal chair frame welding positioning tool, which solves the problem of easy adhesion and welding of the metal chair frame welding positioning tool and the skeleton, and the tool is difficult to contact after welding. Forced separation will cause damage to the tool and the skeleton, thereby shortening the service life of the tool.

[0010] (II) Technical solutions

[0011] To achieve the above purpose, the present application provides the following technical scheme: a metal chair frame welding positioning tool, comprising a base, the base is provided with an adjusting part, the adjusting part is connected with a supporting part, the supporting part is provided with a positioning part one, the positioning part one is provided with a positioning part two, the supporting part is connected with a clamping part, the supporting part comprises a supporting plate, the supporting plate is L-shaped structure, the positioning part one comprises a hinge plate, the number of the hinge plate is two, the two hinge plates are symmetrically connected on the supporting plate, the two hinge plates are both hingedly connected with a supporting arm through a bolt, the two supporting arms are both provided with a positioning hole, the end of the two supporting arms is both connected with an adsorption piece, the two ear ends of the supporting plate are both provided with a clamping groove, the two clamping grooves are both connected with a magnet, each magnet is attracted to the adjacent adsorption piece.

[0012] Preferably, the positioning part two comprises two grooves, the two grooves are symmetrically provided on the two ear ends of the supporting plate, the inner walls of the two grooves are both slidably connected with a compensation block, the compensation block is L-shaped structure, and each compensation block is elastically connected with a spring two between the inner wall of the groove.

[0013] Preferably, the adjusting part comprises an adjusting groove, the adjusting groove is provided in the middle of the base, the base is symmetrically provided with four sliding grooves, four sliding holes are provided in the four sliding grooves, four limiting holes are symmetrically provided in the adjusting groove, the four limiting holes and the four sliding grooves are staggered, a baffle is installed on the base, and a through hole is provided in the baffle.

[0014] Preferably, the adjusting part further comprises a screw, the screw is rotationally connected at the center of the adjusting groove, the end of the screw is movably connected through the through hole of the baffle and is fixedly connected with a hand wheel, the adjusting circular table is slidably connected in the adjusting groove, and four limiting plates are fixedly connected on the adjusting circular table.

[0015] Preferably, the supporting part further comprises a sliding arm, the sliding arm is slidably connected to the inner wall of one of the sliding grooves, one end of the sliding arm is slidably connected through the sliding hole and is fixedly connected with a supporting plate, the supporting plate is fixedly connected between the supporting plate and the supporting plate, the other end of the sliding arm is an arc surface structure and is attached between the adjusting circular table, a tab is connected to the sliding arm, and a spring is elastically connected between the tab and the sliding groove.

[0016] Preferably, the positioning part one and the positioning part two form a positioning compensation mechanism, the number of the positioning compensation mechanism and the supporting part is four respectively, and four positioning compensation mechanisms are respectively installed on four supporting parts.

[0017] Preferably, the four sliding arms in the four supporting parts are respectively arranged in the four sliding grooves, and the arc ends of the four sliding arms are attached to the adjusting circular table.

[0018] Preferably, the clamping part comprises two positioning arms, two positioning arms are respectively mounted on two supporting plates on the same side, two positioning arms are provided with a guide groove, a guide block is arranged in each guide groove, a clamping block is connected to each guide block, and a tension spring is elastically connected between the inner wall of each guide groove and the guide block.

[0019] Preferably, the supporting plate is provided with a chair frame connecting piece, two compensation blocks in each positioning part two are respectively abutted on an inner wall corner of the chair frame connecting piece, the chair frame connecting piece is attached between the four supporting plates, the two sides of the chair frame connecting piece are welded with welding pieces, and a seat is mounted on the chair frame connecting piece.

[0020] Preferably, the number of the clamping part is two, the other clamping part is mounted on the two supporting plates on the other side, the two clamping parts are symmetrically arranged with each other, and the two clamping blocks in each clamping part are clamped with the welding pieces on the same side, and the two chair legs are welded between the welding pieces.

[0021] (Three) beneficial effects

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

[0023] 1. The metal chair frame welding positioning tool adopts magnetic attraction fixation of the positioning part one, the adsorption piece and the magnet are attracted to each other, the elastic clamping of the clamping part replaces the traditional spot welding fixation mode, the welding adhesion risk of the tool and the workpiece is eliminated from the source, when disassembling, only the magnetic attraction and the pulling of the clamping block are needed, without the need of angle grinder cutting or knocking, the surface scratch, deformation and main weld damage of the workpiece are avoided, and the scrap rate is reduced.

[0024] 2. The metal chair frame welding positioning tool adopts the L-shaped compensation block of the positioning part two, which is elastically connected with the groove through the spring two, can automatically abut against the inner wall corner of the chair frame connecting piece, compensates the gap caused by the machining error, ensures the close fit of the workpieces of different sizes and the support plate, solves the problems of loose or tight positioning caused by the one-size-fits-all of the traditional positioning block one, and improves the positioning accuracy consistency of the workpieces in batch production.

[0025] 3. The metal chair frame welding positioning tool adopts the clamping part, the clamping block is driven to slide along the guide groove through the tension spring, and the elastic clamping force is formed, which can stably clamp the connecting part of the chair leg and the welding piece, and avoid the deformation of the workpiece caused by rigid extrusion, and at the same time, the synchronous distance adjustment of the adjusting part is matched, which can adapt to chair legs of different lengths and diameters, and improve the universality of the tool.

[0026] 4. The metal chair frame welding positioning tool adopts the adjusting part, the adjusting circular table is driven by the screw rod to realize the synchronous distance adjustment of the four supporting parts, ensure the center positioning accuracy of the chair frame connecting piece, the adjustable supporting arm of the positioning part one is inserted into the pin through the positioning hole, and the L-shaped structure of the support plate is matched to form multi-directional accurate constraint on the connecting piece, the clamping part is symmetrically arranged to ensure the relative position stability of the chair leg and the welding piece, and the three parts work together to effectively avoid the horizontal deviation or angle deviation of the workpiece in the welding process, improve the welding quality and subsequent assembly accuracy.

[0027] 5. The metal chair frame welding positioning tool adopts magnetic attraction and elastic structure to reduce the hard friction between the tool and the workpiece, and the components are designed in a modular manner, so that they can be replaced individually without the need of overall scrapping, at the same time, the structural deformation caused by forced disassembly of the traditional tool is avoided, the service life is significantly prolonged, and the equipment maintenance and replacement cost is reduced.

[0028] 6. The metal chair frame welding positioning tool adopts the hand wheel drive of the adjusting part to realize rapid size adaptation, the positioning part and the clamping part do not need complex tools for operation, the tool debugging time is reduced, the positioning is accurate, the disassembly is convenient, the additional processes such as repair welding, rework and repair scratch in the traditional process are avoided, the welding processing efficiency of a single chair frame is significantly improved, and the tool is suitable for batch production scenes. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a whole structure schematic view of the metal chair frame welding positioning tool.

[0030] Figure 2 A metal chair frame welding positioning tool support part and chair frame connecting piece assembly drawing is provided for the present application;

[0031] Figure 3 A metal chair frame welding positioning tool support part and chair frame connecting piece assembly drawing is provided for the present application;

[0032] Figure 4 A metal chair frame welding positioning tool support part and chair frame connecting piece assembly drawing is provided for the present application;

[0033] Figure 5 A metal chair frame welding positioning tool support part and chair frame connecting piece assembly drawing is provided for the present application;

[0034] Figure 6 A metal chair frame welding positioning tool support part and chair frame connecting piece assembly drawing is provided for the present application;

[0035] Figure 7 A metal chair frame welding positioning tool support part and chair frame connecting piece assembly drawing is provided for the present application;

[0036] Figure 8 A metal chair frame welding positioning tool support part and chair frame connecting piece assembly drawing is provided for the present application;

[0037] Figure 9 A metal chair frame welding positioning tool support part and chair frame connecting piece assembly drawing is provided for the present application;

[0038] In the figure: 1, base; 2, adjusting part; 21, adjusting groove; 22, sliding groove; 23, sliding hole; 24, limiting hole; 25, screw; 26, hand wheel; 27, adjusting round table; 28, limiting plate; 3, support part; 31, sliding arm; 32, tab; 33, spring one; 34, support plate; 35, support plate; 4, positioning part one; 41, hinged plate; 42, support arm; 43, positioning hole; 44, adsorption piece; 45, magnet; 5, positioning part two; 51, groove; 52, compensation block; 53, spring two; 6, clamping part; 61, positioning arm; 62, guide groove; 63, guide block; 64, clamping block; 7, chair frame connecting piece; 8, welding piece; 9, chair leg; 10, chair seat; 11, baffle. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0040] Please refer to Figures 1-9 The application provides a technical solution: a metal chair frame welding positioning tool, which comprises a base 1, an adjusting part 2 is arranged on the base 1, synchronous spacing adjustment of a supporting part 3 is realized through mechanical transmission, metal chair frame connecting pieces 7 of different sizes are adapted, basic adjustment capability is provided for positioning and clamping, the supporting part 3 is connected to the adjusting part 2, serves as a mounting carrier of a positioning structure and a clamping structure, transmits power of the adjusting part 2 and provides stable support, meanwhile, positioning accuracy is ensured through an elastic reset structure, a positioning part one 4 is arranged on the supporting part 3, the plane position of the chair frame connecting piece 7 is accurately fixed through adjustable mechanical positioning and magnetic attraction assistance, transverse deviation during welding is avoided, a positioning part two 5 is arranged on the positioning part one 4, size errors of the chair frame connecting piece 7 are eliminated through an elastic compensation structure, the fitting accuracy of edges and corners of the connecting piece 7 and a supporting plate 35 is ensured, the consistency of welding positioning is improved, a clamping part 6 is connected to the supporting part 3, a chair leg 9 and a welding piece 8 are elastically clamped, the relative position stability of the two during the welding process is ensured, meanwhile, the tool and the workpiece are prevented from being adhered due to excessive clamping, the supporting part 3 comprises the supporting plate 35, the supporting plate 35 is an L-shaped structure, the positioning part one 4 comprises a hinged plate 41, the number of the hinged plates 41 is two, the two hinged plates 41 are symmetrically connected to the supporting plate 35, a supporting arm 42 is hingedly connected to each of the two hinged plates 41 through a bolt, a positioning hole 43 is formed in each of the two supporting arms 42, an adsorption piece 44 is connected to the end of each of the two supporting arms 42, a clamping groove is formed in each of the two ear ends of the supporting plate 35, a magnet 45 is connected to each of the two clamping grooves, each magnet 45 is attracted to the adsorption piece 44 adjacent to the magnet 45, the adsorption piece 44 at the end of the supporting arm 42 is attracted to the magnet 45 on the supporting plate 35, the angle of the supporting arm 42 is stably fixed, the positioning hole 43 can be inserted into an auxiliary positioning pin, the accurate constraint on the connecting piece is further strengthened, the positioning part two 5 comprises two grooves 51, the two grooves 51 are symmetrically formed in the two ear ends of the supporting plate 35, a compensation block 52 is slidably connected to the inner wall of each of the two grooves 51, the compensation block 52 is an L-shaped structure, a spring two 53 is elastically connected between each compensation block 52 and the inner wall of the groove 51 where the compensation block 52 is located, 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 spring two 53, when the chair frame connecting piece 7 is placed on the supporting plate 35, the compensation block 52 abuts against the inner wall edge corner of the connecting piece under the elastic force of the spring two 53, automatically compensates for the gap caused by the machining error, and ensures the close fitting of the connecting piece and the supporting plate 35.

[0041] In the embodiment, the adjusting part 2 comprises an adjusting groove 21 which is arranged in the middle of the base 1, four sliding grooves 22 are symmetrically arranged on the base 1, sliding holes 23 are arranged in the four sliding grooves 22, four limiting holes 24 are symmetrically arranged in the adjusting groove 21, the four limiting holes 24 are staggered with the four sliding grooves 22, a baffle 11 is arranged on the base 1, a through hole is arranged in the baffle 11, the adjusting part 2 further comprises a screw rod 25 which is rotationally connected to the center of the adjusting groove 21, the end of the screw rod 25 is movably arranged through the through hole of the baffle 11 and is fixedly connected with a hand wheel 26, an adjusting circular table 27 is slidably arranged in the adjusting groove 21, four limiting plates 28 are fixedly connected to the adjusting circular table 27, the four limiting plates 28 are slidably arranged in the four limiting holes 24 respectively, the screw rod 25 is driven to rotate by rotating the hand wheel 26, the adjusting circular table 27 is driven to move axially along the adjusting groove 21, the conical surface structure of the adjusting circular table 27 drives the four sliding arms 31 to move synchronously radially along the sliding grooves 22, the distance between the supporting parts 3 is expanded or contracted, the limiting plates 28 are limited to rotate by cooperating with the limiting holes 24, and the stability of the adjustment is ensured.

[0042] It is worth noting that the supporting part 3 further comprises a sliding arm 31 which is slidably arranged on the inner wall of one of the sliding grooves 22, one end of the sliding arm 31 is slidably arranged through the sliding hole 23 and is fixedly connected with a supporting plate 34, the supporting plate 34 is fixedly connected between the supporting plate 35, the other end of the sliding arm 31 is an arc surface structure and is attached to the adjusting circular table 27, a tab 32 is connected to the sliding arm 31, a spring 33 is elastically connected between the tab 32 and the sliding groove 22, the positioning part one 4 and the positioning part two 5 form a positioning compensation mechanism, the number of the positioning compensation mechanism and the supporting part 3 is four respectively, the four positioning compensation mechanisms are arranged on the four supporting parts 3 respectively, the two positioning compensation mechanisms are symmetrically arranged with each other, the four sliding arms 31 in the four supporting parts 3 are arranged in the four sliding grooves 22 respectively, the arc end of the four sliding arms 31 is attached to the adjusting circular table 27, one end of the sliding arm 31 is attached to the adjusting circular table 27, receives the power of the adjusting part 2 and slides along the sliding groove 22, drives the supporting plate 34 and the supporting plate 35 to move synchronously, the spring 33 connects the tab 32 and the sliding groove 22, provides elastic tension when the adjusting circular table 27 is reset, and makes the sliding arm 31 return to the initial position, the L-shaped supporting plate 35 provides a mounting surface for the positioning part one 4 and the positioning part two 5, and directly attaches to the chair frame connecting piece 7 to realize basic support.

[0043] It is worth noting that the clamping part 6 comprises two positioning arms 61 respectively mounted on the two support plates 34 on the same side, two positioning arms 61 are provided with guide grooves 62, each guide groove 62 is provided with a guide block 63, each guide block 63 is connected with a clamping block 64, each guide block 63 is elastically connected with a tension spring between the inner wall of the guide groove 62, the support plate 35 is provided with a chair frame connecting piece 7, the two compensation blocks 52 in each positioning part two 5 abut on the inner wall corner of the chair frame connecting piece 7 respectively, the chair frame connecting piece 7 is attached between the four support plates 35, the chair frame connecting piece 7 is welded with a welding sheet 8 on both sides, the chair seat 10 is installed on the chair frame connecting piece 7, the number of clamping parts 6 is two, 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 are clamped with the welding sheet 8 on the same side, the two chair legs 9 are respectively welded between the welding sheet 8 connected with each other, the positioning arm 61 is fixed on the support plate 34, the guide block 63 slides along the guide groove 62, drives the clamping block 64 to approach or away from the welding sheet 8, the tension spring connects the guide block 63 with the inner wall of the guide groove 62, provides continuous clamping force, makes the clamping block 64 stably clamp the connecting part of the chair leg 9 and the welding sheet 8, the elastic clamping design avoids the deformation of the workpiece caused by rigid extrusion, reduces the need for spot welding fixation, and is convenient for later removal.

[0044] Working principle, rotate hand wheel 26, screw rod 25 drives adjusting circular table 27 to move axially along adjusting groove 21, the taper surface of adjusting circular table 27 extrudes the arc surface end of four slide arms 31, so that slide arms 31 slide outward along slide groove 22, drive support plates 34 and support plates 35 to expand synchronously, until the spacing of four support plates 35 adapts to the size of chair frame connecting piece 7, spring one 33 is in a stretched state at this time, reserving elastic force for subsequent reset, limiting plate 28 slides along limiting hole 24, ensuring that adjusting circular table 27 does not rotate, ensuring the synchronism of movement of four slide arms 31.

[0045] Place the chair frame connecting piece 7 on the four support plates 35, the outer wall is attached with the support plate 35, the support arm 42 of the positioning part one 4 is attached with the edge of the chair frame connecting piece 7, the adsorption sheet 44 is attracted and fixed with the magnet 45 to fix the angle of the support arm 42, the positioning hole 43 is inserted into the pin to strengthen the constraint, preventing the chair frame connecting piece 7 from sliding transversely, the compensation block 52 of the positioning part two 5 automatically abuts on the inner wall of the chair frame connecting piece 7 under the elastic force of spring two 53, compensating for the gap caused by machining error, ensuring the close attachment of the chair frame connecting piece 7 and the support plate 35, avoiding micro displacement during welding.

[0046] The two side welding pieces 8 of the chair frame connecting piece 7 need to be welded with the chair legs 9. The chair legs 9 are placed at the preset positions of the welding pieces 8, the clamping blocks 64 of the clamping part 6 slide along the guide grooves 62 under the action of the tension of the tension spring, and the chair legs 9 are clamped from both sides. The elastic clamping design avoids workpiece deformation caused by rigid extrusion, and at the same time, there is no need to fix the workpiece through spot welding, thereby reducing the risk of welding from the source.

[0047] During the welding process, the positioning part one 4 and the positioning part two 5 ensure the stable position of the connecting piece, and the clamping part 6 ensures the accurate relative position of the chair legs 9 and the welding pieces 8. Since the fixation of the tool and the workpiece depends on the magnetic positioning part one 4 and the elastic clamping positioning part two 5 and the clamping part 6, rather than spot welding, welding spatter and slag will not cause the tool and the workpiece to be adhered.

[0048] After the welding is completed, the hand wheel 26 is reversely rotated, the circular table 27 is adjusted to move to the left, the spring one 33 pulls the sliding arm 31 to reset, the distance between the four supporting plates 35 is reduced, the supporting of the chair frame connecting piece 7 is released, the supporting arm 42 is manually pulled, the adsorption piece 44 is separated from the magnet 45, and the positioning constraint is released.

[0049] The clamping block 64 is pulled outward, the tension spring is stretched, the clamping block 64 is separated from the chair leg 9, the tool removal is completed, the whole process does not need to be cut or knocked, the workpiece or the tool is avoided from being damaged, and the problem of difficult removal of the traditional tool is solved.

[0050] It should be noted that, in the present text, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or equipment including the element.

Claims

1. A metal chair frame welding positioning tool, comprising a base (1), characterized in that: The base (1) is provided with an adjusting part (2), the adjusting part (2) is connected with a supporting part (3), the supporting part (3) is provided with a positioning part one (4), the positioning part one (4) is provided with a positioning part two (5), the supporting part (3) is connected with a clamping part (6), the supporting part (3) includes a supporting plate (35), the supporting plate (35) is L-shaped structure, the positioning part one (4) includes a hinged plate (41), the number of the hinged plate (41) is two, two the hinged plate (41) is symmetrically connected on the supporting plate (35), two the hinged plate (41) is all connected with a support arm (42) through a bolt, two the support arm (42) is all provided with a positioning hole (43), the end of two the support arm (42) is all connected with an adsorption piece (44), the two ear ends of the supporting plate (35) are all provided with a clamping groove, two the clamping groove is all connected with a magnet (45), each The magnet (45) is attracted to the adsorption piece (44) adjacent to itself; The positioning part two (5) includes two grooves (51), two the groove (51) is symmetrically provided on the two ear ends of the supporting plate (35), the inner wall of two the groove (51) is slidably connected with a compensation block (52), the compensation block (52) is L-shaped structure, each The spring two (53) is elastically connected between the compensation block (52) and the inner wall of the groove (51) where it is located. The adjusting part (2) includes an adjusting groove (21), the adjusting groove (21) is provided in the middle of the base (1), the base (1) is symmetrically provided with four sliding grooves (22), four The sliding groove (22) is all provided with a sliding hole (23), the adjusting groove (21) is symmetrically provided with four limiting holes (24), four The limiting hole (24) and four sliding grooves (22) are staggered, the base (1) is provided with a baffle (11), the baffle (11) is provided with a through hole; The adjusting part (2) further includes a screw rod (25), the screw rod (25) is rotatably connected to the center of the adjusting groove (21), the end of the screw rod (25) is movably connected through the through hole of the baffle (11) and is fixedly connected with a hand wheel (26), the adjusting groove (21) is slidably connected with an adjusting circular table (27), the surface of the adjusting circular table (27) is a conical surface structure, the adjusting circular table (27) is fixedly connected with four limiting plates (28), four The limiting plate (28) is slidably connected in four limiting holes (24) respectively; The supporting part (3) further includes a sliding arm (31), the sliding arm (31) is slidably connected to the inner wall of one of the sliding grooves (22), one end of the sliding arm (31) is slidably connected through the sliding hole (23) and is fixedly connected with a support plate (34), the support plate (34) is fixedly connected between the supporting plate (35), the other end of the sliding arm (31) is an arc surface structure and is attached to the adjusting circular table (27), the sliding arm (31) is connected with a tab (32), the tab (32) is elastically connected with a spring one (33) between the sliding groove (22). The positioning part one (4) and the positioning part two (5) constitute a positioning compensation mechanism, the positioning compensation mechanism and the support part (3) are each four in number, four positioning compensation mechanisms are respectively installed on four support parts (3), and every two positioning compensation mechanisms are symmetrically arranged with each other; Four sliding arms (31) in four support parts (3) are respectively arranged in four sliding grooves (22), and the arc surface ends of four sliding arms (31) are all attached to the adjusting circular table (27).

2. The metal chair frame welding positioning tool according to claim 1, characterized in that: The clamping part (6) comprises two positioning arms (61), two positioning arms (61) are respectively installed on two support plates (34) on the same side, two positioning arms (61) are all provided with guide grooves (62), each guide groove (62) is provided with a guide block (63), each guide block (63) is connected with a clamping block (64), and each guide block (63) is elastically connected with the inner wall of the guide groove (62) by a tension spring.

3. The metal chair frame welding positioning tool according to claim 2, characterized in that: The support plate (35) is provided with a chair frame connecting piece (7), two compensation blocks (52) in each positioning part two (5) are respectively abutted against an inner wall corner of the chair frame connecting piece (7), the chair frame connecting piece (7) is attached between four support plates (35), and the two sides of the chair frame connecting piece (7) are welded with welding sheets (8).

4. The metal chair frame welding positioning tool according to claim 3, characterized in that: The number of the clamping part (6) is two, another clamping part (6) is installed on two support plates (34) on the other side, two clamping parts (6) are symmetrically arranged with each other, two clamping blocks (64) in each clamping part (6) are clamped with chair legs (9) between the welding sheets (8) on the same side, and two chair legs (9) are respectively welded between the welding sheets (8) connected with each other.

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