Bent arm welding tool

Abstract

The invention discloses a bent arm welding tool, belongs to the field of welding auxiliary facilities, and aims to improve the welding efficiency and precision. A base is included; the base is provided with a limiting structure I for supporting and limiting the position of the connecting rod I; the limiting structure II is used for supporting and limiting the position of the upper bent arm; the limiting structure III is used for supporting and limiting the position of the lower bent arm; the limiting structure IV is used for supporting and limiting the position of a connecting shaft on the vehicle door; the limiting structure V is used for supporting and limiting the position of the vehicle door lower connecting shaft; the sixth limiting structure is used for supporting and limiting the second connecting rod; after the first connecting rod, the automobile door upper connecting shaft, the automobile door lower connecting shaft, the upper bent arm, the lower bent arm and the second connecting rod are in place, the relative position relation among the connecting rods meets the requirement of the bent arm assembly. Thus, after all parts forming a bent arm assembly are installed on the bent arm welding tool at a time, construction of all welding seams can be completed at a time, so that construction of all the welding seams is based on the same welding datum, the welding seam consistency of all the welding seams is guaranteed, and the finished product quality of the bent arm assembly is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the field of welding auxiliary facilities, and specifically relates to a bent arm welding tooling. Background Art

[0002] The bent arm assembly of the middle door of a passenger car is one of the key components in the passenger car door system, mainly used to connect the door and the vehicle body, support the opening and closing movement of the door, and ensure the stability and safety of the door during operation. Figure 1 There is disclosed a bent arm assembly structure of the middle door of a passenger car, including a lower bent arm 101, an upper bent arm 102, a first connecting rod 103, a second connecting rod 104, an upper connecting shaft 106 of the door and a lower connecting shaft 105 of the door; these components are welded into a bent arm assembly 1.

[0003] Among them, connection shaft heads 103A are respectively provided at both ends of the first connecting rod 103, one of the connection shaft heads 103A is used to install the upper support on the vehicle body, and the other connection shaft head 103A is used to install the lower support on the vehicle body; both the lower bent arm 101 and the upper bent arm 102 include an arc section 101A close to the vehicle body, a bent section 101B close to the door, and a straight section 101C connecting the arc section 101A and the bent section 101B; the lower connecting shaft 105 of the door is a stepped shaft, including a lower large shaft section 105A, a lower middle shaft section 105B and a lower small shaft section 105C, and a plane is machined along the axial direction on the upper edge of the lower small shaft section 105C; the lower large shaft section 105A is connected to the bent section 101B of the lower bent arm 101 through a weld; the upper connecting shaft 106 of the door is a stepped shaft, including an upper large shaft section 106A and an upper middle shaft section 106B; the upper large shaft section 106A is connected to the bent section 101B of the upper bent arm 102 through a weld; the second connecting rod 104 is parallel to the first connecting rod 103, one end is connected to the straight section 101C of the upper bent arm 102 through a weld, and the other end is connected to the straight section 101C of the lower bent arm 101 through a weld; the arc section 101A of the lower bent arm 101 is connected to the first connecting rod 103 through a weld, and the arc section 101A of the upper bent arm 102 is connected to the first connecting rod 103 through a weld; a limiting shaft 107 parallel to the first connecting rod 103 is arranged inside the arc section 101A of the lower bent arm 101, a connecting pipe 108 is welded inside the arc section 101A of the lower bent arm 101, and the limiting shaft 107 is welded to the connecting pipe 108.

[0004] There are multiple welds in the above-mentioned bent arm assembly. At present, there is no special welding auxiliary tooling to clamp these rod components. During welding, mainly two of the components are first fixedly welded on the welding operation table, and then the previously welded structure is used as a whole to be welded with other components until all welds are completed. During the whole process, it is necessary to frequently adjust the positions of the components, which not only wastes time, but also has low welding efficiency and difficult precision guarantee. Summary of the Invention

[0005] The object of the present invention is to provide a bent arm welding tooling fixture, which fixes each component constituting the bent arm assembly, realizes simultaneous welding of each component, and improves welding efficiency and precision.

[0006] The technical solution adopted by the present invention is: a bent arm welding tooling fixture,

[0007] including a base;

[0008] The base is provided with:

[0009] a first limiting structure for lifting and limiting the position of the first connecting rod;

[0010] a second limiting structure for lifting and limiting the position of the upper bent arm;

[0011] a third limiting structure for lifting and limiting the position of the lower bent arm;

[0012] a fourth limiting structure for lifting and limiting the position of the upper connecting shaft on the vehicle door;

[0013] a fifth limiting structure for lifting and limiting the position of the lower connecting shaft on the vehicle door;

[0014] and a sixth limiting structure for lifting and limiting the second connecting rod;

[0015] When the first connecting rod is in place in the first limiting structure, the upper connecting shaft on the vehicle door is in place in the fourth limiting structure, the lower connecting shaft on the vehicle door is in place in the fifth limiting structure, the upper bent arm is in place in the second limiting structure, the lower bent arm is in place in the third limiting structure, and the second connecting rod is in place in the sixth limiting structure, the relative position relationship among the first connecting rod, the upper connecting shaft on the vehicle door, the lower connecting shaft on the vehicle door, the upper bent arm, the lower bent arm, and the second connecting rod meets the requirements of the bent arm assembly.

[0016] Further, the base includes a horizontal bottom frame, a first support cross beam for installing the first limiting structure, and a second support cross beam for installing the second limiting structure and the third limiting structure; the first support cross beam is supported on the bottom frame through columns at both ends of its bottom; the second support cross beam is supported on the bottom frame through columns at both ends of its bottom.

[0017] Further, the first limiting structure includes end brackets for lifting and supporting the connecting shaft heads at both ends of the first connecting rod. A V-shaped groove for clamping the connecting shaft heads is provided on the end brackets, and the end faces at both ends of the first connecting rod abut against the limiting end faces of the two sets of end brackets;

[0018] Pressing devices are respectively arranged laterally outside the end brackets. The pressing heads of the pressing devices are centered above the end brackets. When the connecting shaft heads are supported on the end brackets, the pressing heads of the pressing devices press down the connecting shaft heads.

[0019] Further, there are two sets of limiting claws arranged horizontally. The limiting claws include a mounting base and a claw arm. The mounting base is mounted on the base. One end of the claw arm is hinged to the mounting base, and the other end extends upward and bends forward to above the first connecting rod. One set of the claw arms resists the lower bent arm from the right side of the lower bent arm, and the other set of claw arms resists the upper bent arm from the left side of the upper bent arm.

[0020] Further, both the second limiting structure and the third limiting structure include a first clamp for locking the straight section and a second clamp for locking the bent section.

[0021] Further, the first clamp includes a first clamping block and a first clamping plate. The first clamping block includes a connecting section for connecting with the base and a lifting section for lifting the straight section. The lifting section includes a bottom lifting plane and a lateral limiting plane. The bottom lifting plane is inclined, and the inclination is the same as that of the straight section. The first clamping plate is arranged on the opposite side of the lateral limiting plane, and the straight section is clamped relatively by the first clamping plate and the lateral limiting plane.

[0022] Further, the first clamping plate is longitudinally movably mounted on the first clamping block. When the first clamping plate moves backward longitudinally to the extreme position, the front end of the first clamping plate is longitudinally located behind the bottom lifting plane.

[0023] Further, a longitudinally extending strip-shaped hole is provided on the first clamping plate. A threaded rod is fixed on the side surface of the first clamping block. The threaded rod passes through the strip-shaped hole and is connected with an adjusting nut.

[0024] Further, the connecting section of the first clamping block is of a square tube structure.

[0025] The second limiting structure further includes a bracket for lifting the arc section of the upper bent arm. The bracket is L-shaped. The horizontal section of the bracket is inserted into the cavity of the connecting section, and the top of the vertical section supports the arc section.

[0026] Further, the third limiting structure further includes a pillar for supporting the limiting shaft. The top of the pillar includes a vertical plate and a horizontal plate. A cushion block is provided on the horizontal plate. The limiting shaft is arranged in the limiting groove of the cushion block. An adjusting through hole for installing an adjusting rod is provided on the vertical plate. The adjusting rod passes through the adjusting through hole and abuts against the end face of the limiting shaft. A limiting plate adapted to the inclination of the connecting pipe is provided on the inner side of the horizontal plate. The connecting pipe leans against the limiting plate and its bottom end is supported on the horizontal plate.

[0027] Further, the second clamp includes a second clamping block and a second clamping plate. The second clamping block is mounted on the base, and the second clamping plate is detachably connected to the second clamping block. The bent section is clamped relatively by the second clamping plate and the second clamping block.

[0028] Further, the fourth limiting structure includes an L-shaped upper positioning block. A jack that penetrates transversely and is adapted to the jack hole of the upper middle shaft segment and a slot adapted to the upper large shaft segment are provided on the upper positioning block, and the jack and the slot are coaxial. A limiting screw is provided on the right side of the upper positioning block, and the limiting screw is installed on the base through an ear seat. The stepped surface of the upper positioning block and the limiting screw clamp the upper large shaft segment axially along the upper large shaft segment.

[0029] A pressing device is provided longitudinally on the front side of the upper positioning block. When the connecting shaft on the vehicle door is positioned on the upper positioning block, the pressing head of the pressing device presses down on the upper large shaft segment.

[0030] Further, the fifth limiting structure includes a stepped lower positioning block.

[0031] A stepped limiting groove adapted to the lower large shaft segment and the lower middle shaft segment is provided on the second step surface of the lower positioning block. During operation, the lower large shaft segment and the lower middle shaft segment are inserted into the limiting groove, and the stepped surface of the limiting groove abuts against the stepped surface between the lower large shaft segment and the lower middle shaft segment.

[0032] A limiting block is provided on the first step surface of the lower positioning block, and the rear side surface of the limiting block fits the plane of the lower small shaft segment.

[0033] A pressing device is provided longitudinally on the front side of the lower positioning block. When the lower connecting shaft on the vehicle door is positioned on the lower positioning block, the pressing head of the pressing device presses down on the lower large shaft segment.

[0034] Further, the sixth limiting structure includes two supporting blocks and a pressing device arranged transversely along the base. When the second connecting rod is positioned in the groove of the supporting block, the pressing head of the pressing device presses down on the second connecting rod.

[0035] The beneficial effects of the present invention are as follows: In the bending arm welding tooling disclosed in the present invention, components such as the first connecting rod, the upper bending arm, the lower bending arm, the upper connecting shaft on the vehicle door, the lower connecting shaft on the vehicle door, and the second connecting rod that constitute the bending arm assembly can all be limited by corresponding limiting structures, so that after these components are positioned by this bending arm welding tooling, their relative positions meet the requirements of the finished bending arm assembly. In this way, after all the components constituting the finished bending arm assembly are installed on this bending arm welding tooling at one time, all welds can be constructed at one time, so that the construction of all welds is based on the same welding reference, ensuring the weld consistency of each weld and ensuring the finished product quality of the bending arm assembly. Moreover, the position of the component does not need to be frequently adjusted during the whole process, saving the adjustment time. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the bending arm assembly structure;

[0037] Figure 2 It is a schematic diagram of the bending arm welding tooling structure disclosed in the present invention;

[0038] Figure 3 It is a schematic structural diagram of fixture 1;

[0039] Figure 4 It is a schematic structural diagram of the lower positioning block;

[0040] Figure 5 It is a partial schematic diagram of the limit structure 4;

[0041] Figure 6 It is a schematic structural diagram of using a bent arm welding tooling to position each component of the bent arm assembly;

[0042] Figure 7 It is Figure 6 front view;

[0043] Figure 8 It is Figure 6 top view;

[0044] Figure 9 It is Figure 6 left view;

[0045] Figure 10 It is Figure 6 right view.

[0046] In the figure, the bent arm assembly 1, lower bent arm 101, arc section 101A, bending section 101B, straight section 101C, upper bent arm 102, connecting rod 1 103, connecting shaft head 103A, connecting rod 2 104, door lower connecting shaft 105, lower large shaft section 105A, lower middle shaft section 105B, lower small shaft section 105C, door upper connecting shaft 106, upper large shaft section 106A, upper middle shaft section 106B, limit shaft 107, connecting pipe 108, limit structure 1 3, end support 301, limit claw 302, mounting seat 3021, claw arm 3022, limit structure 2 4, clamping block 1 401, connecting section 4011, lifting section 4012, bottom lifting plane 4013, lateral limit plane 4014, clamping plate 1 402, strip hole 4021, threaded rod 403, adjusting nut 404, bracket 405, clamping block 2 406, clamping plate 2 407, limit structure 3 5, support column 501, vertical plate 5011, horizontal plate 5012, adjusting through hole 5013, cushion block 502, limit plate 503, limit structure 4 6, upper positioning block 601, step surface 6011, jack 6012, slot 6013, limit screw 602, ear seat 603, limit structure 5 7, lower positioning block 701, limit groove 7011, limit block 702, limit structure 6 8, support block 801, pressing device 9. Specific embodiments

[0047] The following further describes the present invention in conjunction with the drawings and embodiments as follows:

[0048] In the present invention, the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "vertical", "upper", "front", "rear", "upright", "horizontal", "top", "bottom", etc. is based on the Figure 2 orientation or positional relationship shown. It is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0049] The bent arm welding tooling, as Figure 2 shown, includes a base 2, and disposed on the base 2 are:

[0050] a first limiting structure 3 for lifting and defining the position of the first connecting rod 103;

[0051] a second limiting structure 4 for lifting and defining the position of the upper bent arm 102;

[0052] a third limiting structure 5 for lifting and defining the position of the lower bent arm 101;

[0053] a fourth limiting structure 6 for lifting and defining the position of the upper connecting shaft 106 on the vehicle door;

[0054] a fifth limiting structure 7 for lifting and defining the position of the lower connecting shaft 105 on the vehicle door;

[0055] and a sixth limiting structure 8 for lifting and defining the second connecting rod 104.

[0056] As Figures 6 - 10 shown, when the first connecting rod 103 is positioned in the first limiting structure 3, the upper connecting shaft 106 on the vehicle door is positioned in the fourth limiting structure 6, the lower connecting shaft 105 on the vehicle door is positioned in the fifth limiting structure 7, the upper bent arm 102 is positioned in the second limiting structure 4, the lower bent arm 101 is positioned in the third limiting structure 5, and the second connecting rod 104 is positioned in the sixth limiting structure 8, the relative positional relationship among the first connecting rod 103, the upper connecting shaft 106 on the vehicle door, the lower connecting shaft 105 on the vehicle door, the upper bent arm 102, the lower bent arm 101, and the second connecting rod 104 meets the requirements of the bent arm assembly 1.

[0057] For the bent arm welding tooling disclosed in the present invention, components such as the first connecting rod 103, the upper bent arm 102, the lower bent arm 101, the upper connecting shaft 106 on the vehicle door, the lower connecting shaft 105 on the vehicle door, and the second connecting rod 104 that constitute the bent arm assembly 1 can all be limited in position by corresponding limiting structures. After these components are positioned on this bent arm welding tooling, their relative positions meet the requirements of the finished bent arm assembly 1. Thus, after all the components constituting the bent arm assembly 1 are installed on this bent arm welding tooling at one time, all welds can be constructed at one time, such that the construction of all welds is based on the same welding reference, ensuring the weld consistency of each weld, and thereby ensuring the finished product quality of the bent arm assembly 1. Moreover, during the whole process, there is no need to frequently adjust the positions of the components, saving the adjustment time.

[0058] As Figure 1 shown, the base 2 includes a horizontal bottom frame 201, a first support crossbeam 202 for mounting the first limiting structure 3, and a second support crossbeam 203 for mounting the second limiting structure 4 and the third limiting structure 5; the first support crossbeam 202 is supported on the bottom frame 201 by columns at both ends of its bottom; the second support crossbeam 203 is supported on the bottom frame 201 by columns at both ends of its bottom. The frame-type base 2 formed by crossbeams, columns, etc. has a simple structure, is light in weight and saves materials.

[0059] Among them, the first limiting structure 3 includes end brackets 301 for supporting the connecting shaft heads 103A at both ends of the first connecting rod 103. A V-shaped groove for clamping the connecting shaft head 103A is provided on the end bracket 301, and the end faces at both ends of the first connecting rod 103 abut against the limiting end faces of the two sets of end brackets 301;

[0060] Pressing devices 9 are respectively arranged laterally outside the end brackets 301. The pressing heads of the pressing devices 9 are centered on the end brackets 301 above the end brackets 301. After the connecting shaft head 103A is supported on the end brackets 301, the pressing heads of the pressing devices 9 press down the connecting shaft head 103A.

[0061] The first connecting rod 103 is clamped in the V-shaped groove. The V-shaped groove plays a role in limiting the first connecting rod 103 longitudinally to prevent the first connecting rod 103 from moving longitudinally.

[0062] Laterally, the right end face of the left end bracket 301 is its limiting end face, and the left end face of the right end bracket 301 is its limiting end face. The end faces at both ends of the first connecting rod 103 are the end faces where the first connecting rod 103 contacts the connecting shaft head 103A. The two ends of the first connecting rod 103 are clamped between the right end face of the left end bracket 301 and the left end face of the right end bracket 301 to limit the first connecting rod 103 axially and prevent the first connecting rod 103 from moving laterally, that is, axially along the first connecting rod 103.

[0063] After the first connecting rod 103 is in place on the end bracket 301, the connecting shaft head 103A is pressed down by the pressing device 9 to completely lock the first connecting rod 103 and prevent the first connecting rod 103 from moving.

[0064] In order to prevent the first connecting rod 103 from bending due to suspension, a middle support block can be provided in the middle of the first connecting rod 103. The middle support block is fixed to the base 2. During use, the first connecting rod 103 is directly placed on the middle support block.

[0065] Of course, the limiting structure 1-3 can also adopt a pair of oppositely arranged ejector rods, and the purpose can be achieved by pressing the connecting rod 1-103 tightly along the axial direction of the connecting rod 1-103 from both ends of the connecting rod 1-103 through this pair of ejector rods.

[0066] In order to further limit the connecting rod 1-103, preferably, two sets of limiting claws 302 are arranged transversely. The limiting claws 302 include a mounting seat 3021 and a claw arm 3022. The mounting seat 3021 is mounted on the base 2, and one end of the claw arm 3022 is hinged to the mounting seat 3021, and the other end extends upward and bends forward to above the connecting rod 1-103. The connecting rod 1-103 is limited by the two sets of limiting claws 302, and the risk of deformation joints caused by welding is further reduced. One set of the claw arms 3022 resists the lower bent arm 101 from the right side of the lower bent arm 101, and the other set of claw arms 3022 resists the upper bent arm 102 from the left side of the upper bent arm 102, and it also plays a certain limiting role on the lower bent arm 101 and the upper bent arm 102 during the welding process, reducing the risk of skew deformation of the upper bent arm 102 or the lower bent arm 101 along the axial direction of the connecting rod 1-103 due to welding.

[0067] Preferably, both the limiting structure 2-4 and the limiting structure 3-5 include a fixture 1 for locking the straight section 101C and a fixture 2 for locking the bent section 101B. The fixture 1 and the fixture 2 perform multi-point limiting along the extension direction of the upper bent arm 102 or the lower bent arm 101, improving the stable reliability of clamping the upper bent arm 102 or the lower bent arm 101.

[0068] Among them, as Figure 3 shown, the fixture 1 includes a clamping block 1-401 and a clamping plate 1-402; the clamping block 1-401 includes a connecting section 4011 for connecting with the base 2 and a lifting section 4012 for lifting the straight section 101C. The lifting section 4012 includes a bottom lifting plane 4013 and a lateral limiting plane 4014. The bottom lifting plane 4013 is inclined, and the inclination degree is the same as that of the straight section 101C. The lifting plane 4013 lifts the straight section 101C from below the straight section 101C; the clamping plate 1-402 is arranged on the opposite side of the lateral limiting plane 4014, and the straight section 101C is clamped relatively by the clamping plate 1-402 and the lateral limiting plane 4014.

[0069] The clamping plate 1-402 can be directly fastened to the clamping block 1-401 by fastening screws. During use, first, loosen the clamping plate 1-402, and place the straight section 101C on the bottom lifting plane 4013; then, tighten the fastening screws to push the clamping plate 1-402 towards the lateral limiting plane 4014 to clamp the straight section 101C.

[0070] In order to facilitate the insertion of the straight section 101C while preventing the clamping plate 1-402 from detaching from the clamping block 1-401, preferably,

[0071] The clamping plate 1 (402) is longitudinally movably mounted on the clamping block 1 (401); when the clamping plate 1 (402) moves backward longitudinally to the extreme position, the front end of the clamping plate 1 (402) is longitudinally located behind the bottom supporting plane (4013).

[0072] The movable connection between the clamping plate 1 (402) and the clamping block 1 (401) can be realized in the form of a sliding groove and a slider. In this embodiment, a strip-shaped hole (4021) extending longitudinally is provided on the clamping plate 1 (402); a threaded rod (403) is fixed on the side surface of the clamping block 1 (401), and the threaded rod (403) passes through the strip-shaped hole (4021) and is connected to an adjusting nut (404). This structure is simple and convenient to process.

[0073] Preferably, the connecting section (4011) of the clamping block 1 (401) is of a square tube structure; the limiting structure 2 (4) further includes a bracket (405) for supporting the arc section (101A) of the upper bending arm (102). The bracket (405) is L-shaped, the horizontal section of the bracket (405) is inserted into the cavity of the connecting section (4011), and the top of the vertical section supports the arc section (101A). The setting of the bracket (405) adds a support to the arc section (101A), which is more conducive to ensuring the stability of the upper bending arm (102). The bracket (405) is inserted into the connecting section (4011) and then bolted to the base (2), making the structure of the limiting structure 2 (4) more compact.

[0074] In order to simultaneously complete the welding of the limiting shaft (107) and the connecting pipe (108), preferably, the limiting structure 3 (5) further includes a pillar (501) for supporting the limiting shaft (107). The top of the pillar (501) includes a vertical plate (5011) and a horizontal plate (5012). A cushion block (502) is provided on the horizontal plate (5012), the limiting shaft (107) is arranged in the limiting groove of the cushion block (502), and an adjusting through hole (5013) for installing an adjusting rod is provided on the vertical plate (5011). The adjusting rod passes through the adjusting through hole (5013) and abuts against the end face of the limiting shaft (107); a limiting plate (503) adapted to the inclination of the connecting pipe (108) is provided on the inner side of the horizontal plate (5012), and the connecting pipe (108) leans against the limiting plate (503) and its bottom end is supported on the horizontal plate (5012).

[0075] The fixture 2 includes a clamping block 2 (406) and a clamping plate 2 (407). The clamping block 2 (406) is installed on the base (2), and the clamping plate 2 (407) is detachably connected to the clamping block 2 (406), and the bending section (101B) is clamped by the clamping plate 2 (407) and the clamping block 2 (406) relatively.

[0076] A semi-circular hoop can be used as the limiting structure 4 (6) to fixedly surround the connecting shaft (106) on the vehicle door on the base (2). In this embodiment, as Figure 5As shown, the fourth limiting structure 6 includes an L-shaped upper positioning block 601. On the upper positioning block 601, there are provided a jack 6012 penetrating transversely and adapted to the upper middle shaft section 106B, and a slot 6013 adapted to the upper large shaft section 106A. The jack 6012 and the slot 6013 are coaxial. On the right side of the upper positioning block 601, there is a limiting screw 602, and the limiting screw 602 is installed on the base 2 through an ear seat 603. The stepped surface 6011 of the upper positioning block 601 and the limiting screw 602 clamp the upper large shaft section 106A axially relative to each other, so that the position of the connecting shaft 106 on the vehicle door is determined.

[0077] A pressing device 9 is provided longitudinally on the front side of the upper positioning block 601. When the connecting shaft 106 on the vehicle door is positioned on the upper positioning block 601, the pressing head of the pressing device 9 presses down on the upper large shaft section 106A. The setting of the pressing device 9 can fix the connecting shaft 106 on the vehicle door and prevent the connecting shaft 106 on the vehicle door from rotating.

[0078] Similarly, as Figure 4 shown, the fifth limiting structure 7 includes a stepped lower positioning block 701. On the second step surface of the lower positioning block 701, there is a stepped limiting groove 7011 adapted to the lower large shaft section 105A and the lower middle shaft section 105B. During operation, the lower large shaft section 105A and the lower middle shaft section 105B are inserted into the limiting groove 7011, and the stepped surface 6011 of the limiting groove 7011 abuts against the stepped surface between the lower large shaft section 105A and the lower middle shaft section 105B. A limiting block 702 is provided on the first step surface of the lower positioning block 701, and the rear side surface of the limiting block 702 fits against the plane of the lower small shaft section 105C. In this way, the position of the lower connecting shaft 105 on the vehicle door is determined.

[0079] A pressing device 9 is provided longitudinally on the front side of the lower positioning block 701. When the lower connecting shaft 105 on the vehicle door is positioned on the lower positioning block 701, the pressing head of the pressing device 9 presses down on the lower large shaft section 105A.

[0080] The sixth limiting structure 8 includes two supporting blocks 801 arranged transversely along the base 2 and a pressing device 9. When the second connecting rod 104 is positioned in the groove of the supporting block 801, the pressing head of the pressing device 9 presses down on the second connecting rod 104. The sixth limiting structure 8 can also adopt a hoop structure or the like.

[0081] The pressing device 9 disclosed in this embodiment can adopt an existing quick clamp or the like.

[0082] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Bend-arm welding tool, characterized by: comprising a base (2); The base (2) is provided with: A limiting structure (3) for supporting and limiting the position of a connecting rod (103); A second limiting structure (4) for supporting and limiting the position of the upper curved arm (102); A limiting structure three (5) for supporting and limiting the position of the lower bending arm (101); A limiting structure four (6) for supporting and limiting the position of a connecting shaft (106) on the vehicle door; A limiting structure five (7) for supporting and limiting the position of the lower connecting shaft (105) of the vehicle door; and a limiting structure six (8) for supporting and limiting the second connecting rod (104); When the connecting rod 1 (103) is located at the limiting structure 1 (3), the upper connecting shaft (106) of the vehicle door is located at the limiting structure 4 (6), the lower connecting shaft (105) of the vehicle door is located at the limiting structure 5 (7), the upper bending arm (102) is located at the limiting structure 2 (4), the lower bending arm (101) is located at the limiting structure 3 (5), and the connecting rod 2 (104) is located at the limiting structure 6 (8), the relative position relationship between the connecting rod 1 (103), the upper connecting shaft (106) of the vehicle door, the lower connecting shaft (105) of the vehicle door, the upper bending arm (102), the lower bending arm (101) and the connecting rod 2 (104) meets the requirements of the bending arm assembly (1).

2. The bent arm welding tool as claimed in claim 1, characterized in that: The limiting structure (3) comprises end brackets (301) for supporting the connecting shaft head (103A) at both ends of the connecting rod (103), and the end brackets (301) are provided with V-shaped grooves for clamping the connecting shaft head (103A), and the end surfaces at both ends of the connecting rod (103) are against the limiting end surfaces of the two sets of end brackets (301); A pressing device (9) is provided on the outer side of the end bracket (301) in the transverse direction. The pressing head of the pressing device (9) is aligned with the end bracket (301) above the end bracket (301). When the connecting shaft head (103A) is supported on the end bracket (301), the pressing head of the pressing device (9) presses down the connecting shaft head (103A).

3. The bent arm welding tool as claimed in claim 2, characterized in that: Two sets of limiting claws (302) are arranged in the transverse direction, and the limiting claws (302) include a mounting seat (3021) and a claw arm (3022). The mounting seat (3021) is installed on the base (2), and one end of the claw arm (3022) is hinged to the mounting seat (3021), and the other end extends upward and bends forward to the top of the connecting rod (103); one set of the claw arms (3022) resists the lower bending arm (101) from the right side of the lower bending arm (101), and the other set of claw arms (3022) resists the upper bending arm (102) from the left side of the upper bending arm (102).

4. The bent arm welding tool according to any one of claims 1 to 3, characterized in that: The second limiting structure (4) and the third limiting structure (5) both include a clamp first for locking the straight section (101C) and a clamp second for locking the bent section (101B).

5. The bent arm welding tool as claimed in claim 4, characterized in that: The clamp 1 comprises a clamp block 1 (401) and a clamp plate 1 (402); the clamp block 1 (401) comprises a connecting section (4011) for connecting with a base (2) and a lifting section (4012) for lifting the straight section (101C); the lifting section (4012) comprises a bottom lifting plane (4013) and a lateral limiting plane (4014); the bottom lifting plane (4013) is arranged at an inclination, and the inclination is consistent with the inclination of the straight section (101C); the clamp plate 1 (402) is arranged on the opposite side of the lateral limiting plane (4014), and the straight section (101C) is relatively clamped by the clamp plate 1 (402) and the lateral limiting plane (4014); The second clamp comprises a second clamp block (406) and a second clamp plate (407). The second clamp block (406) is mounted on the base (2). The second clamp plate (407) is detachably connected to the second clamp block (406). The second clamp plate (407) and the second clamp block (406) relatively clamp the bending section (101B).

6. The bent arm welding tool as claimed in claim 5, characterized in that: The clamping plate 1 (402) is movably installed on the clamping block 1 (401) along the longitudinal direction; when the clamping plate 1 (402) moves backward to the extreme position along the longitudinal direction, the front end of the clamping plate 1 (402) is located at the rear side of the bottom lifting plane (4013) along the longitudinal direction; the clamping plate 1 (402) is provided with a longitudinally extending strip hole (4021); a threaded rod (403) is fixed to the side of the clamping block 1 (401), and the threaded rod (403) passes through the strip hole (4021) and is connected to the adjusting nut (404).

7. The bent arm welding tool as claimed in claim 5, characterized in that: The connecting section (4011) of the clamping block 1 (401) is a square tube structure; The second limiting structure (4) also includes a bracket (405) for supporting the arc segment (101A) of the upper curved arm (102); the bracket (405) is L-shaped, the horizontal section of the bracket (405) is inserted into the cavity of the connecting section (4011), and the top of the vertical section supports the arc segment (101A).

8. The bent-arm welding tool according to any one of claims 1 to 3, characterized in that: The limiting structure three (5) also includes a pillar (501) supporting the limiting shaft (107), the top of the pillar (501) includes a vertical plate (5011) and a horizontal plate (5012), a cushion block (502) is arranged on the horizontal plate (5012), the limiting shaft (107) is arranged in the limiting groove of the cushion block (502), and an adjustment through hole (5013) for installing an adjustment rod is arranged on the vertical plate (5011), and the adjustment rod passes through the adjustment through hole (5013) and abuts against the end face of the limiting shaft (107); a limiting plate (503) adapted to the inclination of the connecting tube (108) is arranged on the inner side of the horizontal plate (5012), and the connecting tube (108) rests on the limiting plate (503) and its bottom end is supported on the horizontal plate (5012).

9. The bent arm welding tool according to any one of claims 1 to 3, characterized in that: The limiting structure four (6) comprises an L-shaped upper positioning block (601), on which a plug hole (6012) penetrating in the transverse direction and connected to the upper middle shaft section (106B) and a slot (6013) adapted to the upper large shaft section (106A) are arranged, and the plug hole (6012) and the slot (6013) are coaxial; a limiting screw (602) is arranged on the right side of the upper positioning block (601), and the limiting screw (602) is installed on the base (2) via an ear seat (603); the step surface (6011) of the upper positioning block (601) and the limiting screw (602) relatively clamp the upper large shaft section (106A) along the axial direction of the upper large shaft section (106A); A pressing device (9) is arranged on the front side of the upper positioning block (601) in the longitudinal direction. When the connecting shaft (106) on the vehicle door is located on the upper positioning block (601), the pressing head of the pressing device (9) presses down the upper large shaft section (106A).

10. The bent arm welding tool according to any one of claims 1 to 3, characterized in that: The limiting structure five (7) comprises a stepped lower positioning block (701), A stepped limiting groove (7011) adapted to the lower large shaft section (105A) and the lower middle shaft section (105B) is provided on the second step surface of the lower positioning block (701); when in operation, the lower large shaft section (105A) and the lower middle shaft section (105B) are inserted into the limiting groove (7011), and the step surface (6011) of the limiting groove (7011) abuts against the step surface between the lower large shaft section (105A) and the lower middle shaft section (105B); A limiting block (702) is arranged on the first step surface of the lower positioning block (701), and the rear side surface of the limiting block (702) is in contact with the plane of the lower small shaft segment (105C); A pressing device (9) is arranged at the front side of the lower positioning block (701) in the longitudinal direction. When the lower connecting shaft (105) of the vehicle door is located on the lower positioning block (701), the pressing head of the pressing device (9) presses down the lower large shaft section (105A).

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