A welding fixture for a seat belt bracket and nut

Abstract

The utility model belongs to the technical field of clamp, especially involves safety belt support and nut's welding clamp, including bottom plate, positioning assembly, support clamping mechanism and nut pressure solid establishment, positioning assembly includes locating block, support flat plate, positioning pin and riser seat, locating block and riser seat are adjacent to set up and can be detachably installed in bottom plate, the top side of locating block is equipped with positioning pin, support flat plate is equipped with the through hole that penetrates, and positioning pin passes through the through hole and extends upward, one end of support flat plate is installed in the top of locating block, support clamping mechanism includes fixed block, translation piece, moving plate, first clamping plate and clamping block, fixed block is detachably installed on the bottom plate, translation piece is installed in the top of fixed block, and its output end is connected with moving plate, and first clamping plate and clamping block are arranged on moving plate, nut pressure solid establishment includes lifting piece, mounting plate and swing bar, mounting plate is detachably installed on the bottom plate, lifting piece is arranged in one side of mounting plate, and its output end is hinged with one end of swing bar, realize the clamp sharing of same type parts.

Description

Technical Field

[0001] This utility model belongs to the field of clamping technology, and in particular relates to a welding clamp for a seat belt bracket and a nut. Background Technology

[0002] In the field of automotive technology, please refer to Figure 3 and Figure 4 The driver and passenger seatbelt brackets (hereinafter referred to as "seatbelt brackets") are typically U-shaped structures. Both their top and bottom plates employ a combination of curved and flat surfaces, resulting in an asymmetrical configuration due to functional requirements. The bottom plate has a vertically penetrating connecting hole for subsequent assembly. During the manufacturing process of the seatbelt brackets, a right-hand drive nut (hereinafter referred to as "nut") must be installed. The screw hole of this nut must align with the connecting hole on the bottom plate and be welded and fixed to the bottom plate of the seatbelt bracket.

[0003] Due to the irregular structure of seat belt brackets, different specifications of seat belt brackets of the same type require different fixtures for the through slots, and the corresponding positioning fixtures for the nuts also need to be adjusted. Existing fixtures are incompatible with brackets of the same type but different specifications. Therefore, when welding seat belt brackets of the same type but different vehicle models or batches, a complete set of fixtures must be custom-made and replaced, requiring machine downtime for debugging. This increases the manufacturing cost of the fixtures and reduces production efficiency. Utility Model Content

[0004] The purpose of this utility model is to provide a welding fixture for seat belt brackets and nuts, which solves the problem that existing fixtures are not compatible with seat belt brackets of different specifications of the same type, requiring the customization of new fixtures, which increases costs and reduces efficiency.

[0005] To achieve the above objectives, this utility model provides a welding fixture for a seat belt bracket and a nut, comprising a base plate, a positioning assembly, a bracket clamping mechanism, and a nut clamping mechanism. The base plate has multiple mounting holes. The bracket clamping mechanism and the nut clamping mechanism are located on opposite sides of the positioning assembly. The positioning assembly includes a positioning block, a support plate, a positioning pin, and a stand. The positioning block and the stand are adjacent to each other and detachably mounted on the base plate. The stand supports and positions the sidewall of the seat belt bracket. The top side of the positioning block has a positioning pin. The support plate has a through hole extending vertically, through which the positioning pin passes and extends upwards to position the seat belt bracket and the nut. One end of the support plate is mounted on the top of the positioning block to support the seat belt bracket and nut. The bottom has a support bracket; the bracket clamping mechanism includes a fixed block, a translation component, a moving plate, a first clamping plate, and a clamping block. The fixed block is detachably mounted on the base plate, the translation component is mounted on the top of the fixed block, and its output end is connected to the moving plate. The first clamping plate and the clamping block are located on the moving plate. The first clamping plate is used to press the seat belt bracket onto the support plate, and the clamping block is used to press the side wall of the seat belt bracket onto the stand. The nut clamping mechanism includes a lifting component, a mounting plate, and a swing rod. The mounting plate is detachably mounted on the base plate, the lifting component is fixedly located on one side of the mounting plate, and its output end is hinged to one end of the swing rod. The lifting component drives one end of the swing rod to move upward, causing the other end of the swing rod to rotate downward, so as to press the nut onto the seat belt bracket.

[0006] Furthermore, the translational direction of the bracket clamping mechanism is set at a certain angle with the central axis of the positioning component, and it also includes a connecting block and a limiting block. One end of the connecting block is disposed on the moving plate, and the limiting block and the clamping block are respectively disposed on both sides of the connecting block. The limiting block is used to position the outer wall of the nut.

[0007] Furthermore, the bracket clamping mechanism also includes a stop block, which is mounted on the base plate and located between the positioning component and the bracket clamping mechanism, for limiting the travel of the moving plate.

[0008] Furthermore, the bracket clamping mechanism also includes a second clamping plate, which is disposed on the top of the movable plate and is used to position the top of the seat belt bracket.

[0009] Furthermore, the base plate is mounted on the base plate via a support column, and the mounting plate is mounted on the bottom surface of the base plate, so that the lifting member is located between the base plate and the base plate. The nut clamping mechanism also includes a connecting seat and a connecting member. The connecting seat is located between the lifting member and the positioning component, and its top side near the positioning component has an upwardly extending protrusion. The connecting member is H-shaped, with its lower end hinged to the connecting seat and its upper end hinged to the swing rod. The protrusion is used to limit the rotation angle of the connecting member.

[0010] Furthermore, the free end of the rocker arm is a pressure block adapted to the shape of the top of the nut. The pressure block has a positioning hole that runs vertically through the nut. The positioning hole is directly opposite the top surface of the nut. A guide plate is provided on the top surface of the rocker arm. The guide plate has a guide hole that connects to the positioning hole. The top of the rocker arm near the free end has a downwardly recessed groove. A first connecting rod and a second connecting rod are hinged in the groove. One end of the first connecting rod is hinged to the second connecting rod, and the other end is hinged to the top of a positioning post. The bottom end of the positioning post passes through the guide hole and the positioning hole in sequence and abuts against the top of the nut. A boss extends radially from the outer periphery of the positioning post. The boss is located in the positioning hole. A spring is sleeved on the outer periphery of the positioning post. The two ends of the spring abut against the guide plate and the boss, respectively. A cover plate is also provided above the groove. The end of the second connecting rod away from the first connecting rod is hinged to the side wall of the groove. Its free end is bent and extends above the groove, abutting against the end of the cover plate away from the first connecting rod.

[0011] Furthermore, the stand has at least one support block on its inner wall near the positioning block, the top surface of the support block is higher than the top surface of the positioning pin, and the stand has stops on both sides, the two stops being used to limit the front and rear ends of the seat belt bracket.

[0012] Furthermore, the positioning component, the bracket clamping mechanism, and the nut pressing mechanism are each provided in two sets, and are respectively located on the left and right sides of the base plate.

[0013] Furthermore, the translation and lifting components are cylinders.

[0014] The above-mentioned technical solutions in the welding fixture for the seat belt bracket and nut provided in this embodiment of the utility model have at least the following technical effects: First, the locating pin is passed through the connecting hole at the bottom of the seat belt bracket, allowing the support plate to stably support the bottom of the seat belt bracket. Simultaneously, the locating pin radially constrains the bottom of the seat belt bracket. The inner side of the support is tightly fitted against and supports the side wall of the seat belt bracket, ensuring initial positioning accuracy from both the bottom and side. Next, the translational component of the bracket clamping mechanism drives the moving plate towards the seat belt bracket, causing the first clamping plate and clamping block to simultaneously extend into the seat belt bracket. The clamping block presses the side wall of the seat belt bracket against the inner side of the support, and the first clamping plate presses the bottom surface of the seat belt bracket against the support plate, firmly clamping the seat belt bracket onto the positioning assembly and effectively preventing displacement during welding. Then, the threaded hole of the nut is fitted into the locating pin extending from the bottom of the seat belt bracket, achieving radial positioning and positioning the nut directly above the connecting hole of the seat belt bracket. Then, the lifting component of the nut clamping mechanism drives one end of the swing arm to rise, causing the other end of the swing arm to rotate downwards and press against the top of the nut, thereby achieving axial clamping and positioning of the nut and ensuring high-precision alignment between the threaded hole of the nut and the connecting hole of the seat belt bracket. Finally, the contact area between the nut and the seat belt bracket is automatically welded to form a welded part.

[0015] After welding, the nut clamping mechanism resets, the lifting component drives one end of the swing arm downwards, and the other end of the swing arm rises, contacting the nut for clamping; the bracket clamping mechanism resets, and the translation component drives the first clamping plate and clamping block to retract, releasing the fixation on the seat belt bracket. The finished welded part is then directly removed upwards, detaching it from the positioning assembly, completing one work cycle. This continuous automated cycle of "part placement-clamping-part placement-clamping-welding-resetting-part removal" is suitable for mass production.

[0016] Since the positioning pin of the positioning component is used for positioning both the seat belt bracket and the nut, it works in conjunction with the bracket clamping mechanism to automatically tighten and loosen the seat belt bracket and the nut clamping mechanism to tighten and loosen the nut, ensuring the consistency of the position of the parts to be welded each time they are clamped. This achieves high-precision repeatable positioning of the parts to be welded by the fixture and effectively reduces welding errors.

[0017] Furthermore, the fixture adopts a modular design: the positioning block and stand of the positioning component are detachably mounted on the base plate, with the remaining parts assembled on the positioning block; the bracket clamping mechanism is detachably mounted on the base plate via a fixing block, with the remaining parts mounted on the fixing block; the nut clamping mechanism is detachably mounted on the base plate via a mounting plate, with the remaining parts located on the lifting component. This layout allows for flexible assembly and disassembly of each component and mechanism on the base plate, enabling quick switching and adjustment of their relative positions. It adapts to the clamping and positioning needs of seat belt brackets and nuts of different specifications of the same type, achieving fixture sharing for similar parts. On the one hand, this significantly improves the switching efficiency of the fixture and reduces adjustment time; on the other hand, it avoids designing separate dedicated fixtures for parts of different specifications, effectively reducing the production cost of dedicated fixtures. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a first-view structural schematic diagram of the welding fixture for the seat belt bracket and nut provided in an embodiment of the present utility model.

[0020] Figure 2 This is a second-view structural schematic diagram of the welding fixture for the seat belt bracket and nut provided in an embodiment of the present utility model.

[0021] Figure 3 This is a schematic diagram of the structure of the seat belt bracket and nut after welding, as provided in an embodiment of this utility model.

[0022] Figure 4 This is a structural diagram of a seatbelt bracket provided in an embodiment of the present utility model.

[0023] Figure 5 A structural diagram of the nut provided in an embodiment of this utility model.

[0024] Figure 6 This is a structural diagram of the positioning assembly of the welding fixture for the seat belt bracket and nut provided in an embodiment of the present utility model.

[0025] Figure 7 This is a first-view structural diagram of the bracket clamping mechanism of the welding fixture for the seat belt bracket and nut provided in an embodiment of the present utility model.

[0026] Figure 8 This is a second-view structural diagram of the bracket clamping mechanism of the welding fixture for the seat belt bracket and nut provided in an embodiment of the present utility model.

[0027] Figure 9 The first-view structural diagram shows the nut clamping mechanism of the welding fixture for the seat belt bracket and nut provided in the embodiment of this utility model in the state of clamping the nut.

[0028] Figure 10 The second-view structural diagram shows the nut clamping mechanism of the welding fixture for the seat belt bracket and nut provided in the embodiment of this utility model in the state of clamping the nut.

[0029] Figure 11 The nut clamping mechanism of the welding fixture for the seat belt bracket and nut provided in this embodiment of the utility model is in a cross-sectional view of the nut clamping mechanism.

[0030] Figure 12 The structural diagram shows the positioning pin extending out of the positioning hole in the nut clamping mechanism of the welding fixture for the seat belt bracket and nut provided in this embodiment of the utility model.

[0031] Figure 13 This is a partial structural diagram of the nut clamping mechanism of the welding fixture for the seat belt bracket and nut provided in this embodiment of the utility model, showing how the nut is loosened.

[0032] In the diagram, 100 is the base plate, 110 is the mounting hole, 120 is the support column, and 130 is the base plate. 200. Positioning component; 210. Positioning block; 220. Support plate; 221. Through hole; 230. Positioning pin; 240. Stand; 241. Support block; 242. Stop block. 300. Bracket clamping mechanism; 310. Fixing block; 320. Translation component; 330. Moving plate; 340. First clamping plate; 350. Clamping block; 360. Connecting block; 370. Limiting block; 380. Stopping block; 390. Second clamping plate. 400. Nut clamping mechanism; 410. Lifting component; 420. Mounting plate; 430. Swing rod; 431. Pressure block; 432. Positioning hole; 433. Guide plate; 434. Groove; 435. Cover plate; 440. Connecting seat; 441. Protrusion; 450. Connecting component; 460. First connecting rod; 461. Positioning pin; 462. Boss; 463. Spring; 470. Second connecting rod. 500. Seatbelt bracket 600, Nut; 610, Limiting Ring. Detailed Implementation

[0033] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of this utility model, and should not be construed as limiting the utility model.

[0034] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0037] In one embodiment of the welding fixture for the seat belt bracket and nut of this utility model, please refer to... Figures 1 to 13 The welding fixture for the seat belt bracket and nut includes a base plate 100, a positioning component 200, a bracket clamping mechanism 300, and a nut clamping mechanism 400. The base plate 100 has multiple mounting holes 110. The bracket clamping mechanism 300 and the nut clamping mechanism 400 are located on the front and rear sides of the positioning component 200, respectively. The positioning component 200 includes a positioning block 210, a support plate 220, a positioning pin 230, and a stand 240. The positioning block 210 and the stand 240 are arranged adjacent to each other and detachably mounted on the base plate 100. The positioning pin 230 is located on the top side of the positioning block 210. The support plate 220 has a through hole 221 extending vertically, through which the positioning pin 230 passes and extends upwards, for positioning the seat belt bracket 500 and the nut 600. One end of the support plate 220 is mounted on the top of the positioning block 210 to support the bottom of the seat belt bracket 500. At least one support block 241 is provided on the inner side of the stand 240 near the positioning block 210 to support and position the side wall of the seat belt bracket 500. The top surface of the support block 241 is higher than the top surface of the positioning pin 230. The front and rear sides of the stand 240 are respectively provided with stop blocks 242, and the two stop blocks 242 cooperate to limit the front and rear ends of the seat belt bracket 500.

[0038] Specifically, the connecting hole at the bottom of the seat belt bracket 500 is passed through the positioning pin 230 of the positioning assembly, allowing its bottom to be placed stably on the support plate 220. The positioning pin 230 provides radial constraint to the bottom of the bracket 500, while the support plate 220 provides stable bottom support. The support block 241 on the inner side of the stand 240 abuts against the side wall of the bracket 500, serving a positioning function; at the same time, the stops 242 on the front and rear sides of the stand 240 respectively limit the front and rear ends of the seat belt bracket 500, thereby ensuring that the seat belt bracket 500 is stably positioned on the positioning assembly 200.

[0039] Preferably, please refer to Figure 6 The inner side of the support 240 has two spaced-apart support blocks 241. This design reduces the contact area between the seat belt bracket 500 and the support 240, which helps to enhance positioning stability. A stop block 242 is detachably installed on the side of the support 240, facilitating replacement and adjustment of the spacing between the two stop blocks 242 to accommodate seat belt brackets 500 of different sizes. The top surface of the support block 241 is higher than the top surface of the positioning pin 230, ensuring that the support block 241 is positioned in the upper-middle part of the side wall of the seat belt bracket 500. The support 240 and the support plate 220 provide stable support throughout the welding process, effectively preventing deformation of the product to be welded.

[0040] Furthermore, the positioning block 210 is locked onto the mounting hole 110 on the base plate by locking bolts, facilitating quick assembly and disassembly. Other components and mechanisms are installed on the base plate 100 using the same locking method.

[0041] Please refer to Figure 1 , Figure 7 and Figure 8 The bracket clamping mechanism 300 includes a fixed block 310, a translation component 320, a moving plate 330, a first clamping plate 340, a clamping block 350, a connecting block 360, a limiting block 370, a stop block 380, and a second clamping plate 390. The translation direction of the bracket clamping mechanism 300 is set at a certain angle to the central axis of the positioning component 200. The fixed block 310 is detachably installed on the base plate 100. The translation component 320 is installed on the top of the fixed block 310, and its output end is connected to the moving plate 330. The first clamping plate 340 and the second clamping plate 390 are respectively installed below and above the moving plate 330 to press the bottom and top surfaces of the seat belt bracket 500 respectively. One end of the connecting block 360 is mounted on the movable plate 330. A clamping block 350 and a limiting block 370 are respectively provided on both sides of the connecting block 360. The clamping block 360 is located on the side of the connecting block 360 closest to the stop block 242. The clamping block 350 is used to press the side wall of the seat belt bracket 500 against the stand 240. The limiting block 370 is used to position the outer side wall of the nut 600. The stop block 380 is mounted on the base plate 100 and located between the positioning assembly 200 and the fixing block 310 of the bracket clamping mechanism, used to limit the travel of the movable plate 330.

[0042] Specifically, because the translation direction of the bracket clamping mechanism 300 forms a certain angle with the central axis of the positioning component 200, after the seat belt bracket 500 is positioned on the positioning component 200, the translation component 320 drives the moving plate 330 to move directionally toward the seat belt bracket 500. When the moving plate 330 reaches the preset clamping position, the stop block 380 precisely abuts against the moving plate 330, restricting its continued advance, thereby preventing the clamping block and clamping plate from excessively pressing the seat belt bracket 500 and causing deformation or damage. At this time, the clamping block 350 extends into the inside of the seat belt bracket 500 and presses its side wall against the support block 241 of the stand, and the limiting block 370 is located beside the positioning pin 230; the first clamping plate 340 simultaneously extends into the inside of the seat belt bracket 500 and presses the bottom surface of the seat belt bracket 500 against the support platform 220, while the second clamping plate 390 is located on the top surface of the seat belt bracket 500 and applies pressure to the top surface. Through multi-directional clamping action, the seat belt bracket 500 is firmly clamped onto the positioning component 200, effectively preventing displacement during the welding process. Subsequently, the nut 600 is fitted onto the positioning pin 230, and the limiting block 370 abuts against the outer wall of the nut 600, achieving radial positioning of the nut 600 and ensuring that the nut 600 is accurately positioned directly above the connecting hole.

[0043] Preferably, please refer to Figure 5 A limiting ring 610 extends downward from the inner wall of the threaded hole of the nut 600, and this limiting ring 610 is coaxially connected with the threaded hole. When the nut 600 is fitted into the locating pin 230, the limiting ring 610 at the bottom of the nut 600 extends into the connecting hole of the seat belt bracket 500, forming a tight fit with the hole wall to achieve radial limiting, ensuring the connection and positioning accuracy between the nut 600 and the seat belt bracket 500, and preventing the nut 600 from misaligning or falling off during installation and welding.

[0044] Further, please refer to Figure 7 and Figure 8 The clamping block 350 includes a connecting section and a clamping section. The connecting section is parallel to the moving direction of the moving plate 330, with one end located on one side of the connecting block 360 and the other end extending outward from the free end of the connecting block 360 and bent at a certain angle to form the clamping section. The clamping section is parallel to the inner side of the support block 241 to increase the contact area with the seat belt bracket 500, ensuring that the side wall of the bracket 500 is pressed tightly against the inner side of the support block 241, thus improving the pressing stability of the side wall. In addition, the angle between the translation direction of the bracket clamping mechanism 300 and the central axis of the positioning component 200 is reasonably set so that the clamping block 350 avoids interference with the stop block 242 of the stand during movement. The bottom surfaces of the connecting block 360, the limiting block 370, and the clamping block 350 are all kept in a non-contact state with the bottom surface 500 of the seat belt bracket to prevent scratching the bracket during movement.

[0045] Please refer to Figure 1 , Figures 9 to 13 The plate 100 is mounted above the base plate 130 via the support column 120. The nut clamping mechanism 400 includes a lifting member 410, a mounting plate 420, a swing rod 430, a connecting seat 440, and a connecting member 450. The mounting plate 420 is detachably mounted on the bottom surface of the base plate 100. The lifting member 410 is fixedly mounted on one side of the mounting plate 420, so that the lifting member 410 is located between the base plate 100 and the base plate 130. The output end of the lifting member 410 is hinged to one end of the swing rod 430. The other free end of the swing rod 430 is a pressure block 431 that is adapted to the shape of the top of the nut 600. The pressure block 431 is provided with a positioning hole 432 that runs vertically through the top and bottom. The positioning hole 432 is directly opposite the top surface of the nut 600. The top surface of the pressure block is provided with a guide plate 433. The guide plate 433 is provided with a guide hole that connects to the positioning hole 432. The top of the rocker arm 430 near its free end has a downwardly recessed groove 434. A first connecting rod 460 and a second connecting rod 470 are hinged within the groove 434. One end of the first connecting rod 460 is hinged to the second connecting rod 470, and the other end is hinged to the top of a positioning post 461. The bottom end of the positioning post 461 passes through a guide hole and a positioning hole 432, and abuts against the top of the nut 600. A boss 462 extends radially from the outer periphery of the positioning post 461, located within the positioning hole 432. A spring 463 is also fitted around the outer periphery of the positioning post 461, with both ends abutting against the guide plate 433 and the boss 462, respectively. A cover plate 435 is also provided above the groove 434. The end of the second connecting rod 470 away from the first connecting rod 460 is hinged to the side wall of the groove 434, and its free end is bent and extends above the groove 434, abutting against the end of the cover plate 435 away from the first connecting rod 460.

[0046] The connecting seat 440 is located between the lifting member 410 and the positioning assembly 200, and has an upwardly extending protrusion 441 on its top side near the positioning assembly 200. The connecting member 450 is H-shaped, with its lower end hinged to the connecting seat 440 and its upper end hinged to the middle of the swing arm 430. The protrusion 441 is used to limit the rotation angle of the connecting member 450. The lifting member 410 drives one end of the swing arm 430 to move upward, causing the free end of the swing arm 430 to rotate downward, so as to press the nut 600 onto the seat belt bracket 500.

[0047] Specifically, after the nut 600 completes its initial positioning, the lifting component 410 drives one end of the swing arm 430 to rotate upwards. At this time, the connecting component 450 of the connecting seat acts as a fulcrum, and the free end of the swing arm 430 rotates downwards around this fulcrum. Under the force of the spring 463, the positioning post 461 of the pressure block extends from below the positioning hole 432 and first contacts the top of the positioning nut 600. As the swing arm 430 continues to rotate, the pressure block 431 moves downwards along the guide of the positioning post 461, pressing the nut 600 against the seat belt bracket 500, thus achieving axial positioning of the nut 600. When the swing arm 430 rotates to the predetermined position, the protrusion 41 on the connecting seat abuts against the cross plate of the H-shaped connecting component 450, restricting the free end of the swing arm 430 from moving further downwards and preventing the pressure block 431 from over-pressing the nut 600 and causing damage. Subsequently, a robot automatically welds the contact area between the nut 600 and the seat belt bracket 500 to form a welded part.

[0048] Please refer to Figure 11 The positioning hole 432 has a larger diameter at the top and a smaller diameter at the bottom. The diameter of the guide hole is smaller than the diameter of the boss 462. Under the force of the spring 463, the bottom end of the positioning pin 461 extends below the positioning hole 432 of the pressure block. At this time, the first connecting rod 460 abuts against the bottom of the groove 434, and the free end of the second connecting rod 470 tilts upward and abuts against the end side of the cover plate 435. When the rocker arm 430 drives the pressure block 431 to rotate downward and approach the nut 600, the positioning pin 461 first contacts the nut 600 and achieves pre-positioning. Then, the pressure block 431 presses down along the positioning pin 461 and presses the nut 600 tightly, effectively preventing misalignment and ensuring that the nut 600 and the connection hole of the seat belt bracket 500 are accurately aligned. During this process, the positioning pin 461 moves upward along the positioning hole 432, compressing the spring 463, and remains in place in the positioning hole 432 under the restriction of the guide plate 433. At the same time, the first connecting rod 460 tilts upward and pushes the free end of the second connecting rod 470 downward.

[0049] In addition, the lifting component 410 is located between the base plate 100 and the base plate 130, which can effectively reduce the overall height of the positioning component 200 and the bracket clamping mechanism 300 on the base plate 100, reduce the manufacturing cost of related parts, and facilitate maintenance and replacement.

[0050] Preferably, please refer to Figure 1 The positioning component 200, the bracket clamping mechanism 300, and the nut clamping mechanism 400 are each provided in two sets, and are respectively located on the left and right sides of the base plate 100. Specifically, two sets of fixtures are provided on the same base plate 100 to form a dual-station layout, which can perform assembly and welding operations simultaneously, or perform material loading / unloading operations at the other station while welding is being performed at one station, effectively improving the production efficiency of welded parts.

[0051] Further, please refer to Figure 7 and Figure 11The translation component 320 is a double-guide-rod cylinder, ensuring smooth linear movement of the moving plate 330 and its clamping elements, guaranteeing the repeatability and welding quality of the bracket clamping mechanism 300. The lifting component 410 is a standard cylinder, ensuring the provision of vertical linear thrust; its simple structure reduces costs.

[0052] The fixture usage process in this embodiment is as follows: The connecting hole of the seatbelt bracket 500 is passed through the positioning pin 230 and positioned on the positioning component 200, taking approximately 1.6 seconds. Then, the bracket clamping mechanism 300 firmly clamps the seatbelt bracket 500 onto the positioning component 200, taking approximately 0.4 seconds. Next, the nut 600 is inserted into the positioning pin 230, taking approximately 1.6 seconds. Then, the nut clamping mechanism 400 clamps and positions the nut 600 onto the seatbelt bracket 500, taking approximately 0.4 seconds. Next, the contact area between the nut 600 and the seatbelt bracket 500 is automatically welded to form a welded part, a process that takes approximately 14.4 seconds. After welding, the nut clamping mechanism 400 resets in approximately 0.4 seconds, the bracket clamping mechanism 300 resets in 0.4 seconds, and finally, the welded part is removed in approximately 2 seconds. The entire work cycle takes no more than 22 seconds, significantly improving production efficiency. This process can be continuously repeated and is suitable for mass production.

[0053] Since the positioning pin 230 of the positioning component is used for positioning both the seat belt bracket 500 and the nut 600, and works in conjunction with the bracket clamping mechanism 300 to automatically clamp and loosen the seat belt bracket 500 and the nut clamping mechanism 400 to clamp the nut 600, the position of the parts to be welded is consistent each time they are clamped, and the fixture achieves high-precision repeatable positioning of the parts to be welded, effectively reducing welding errors.

[0054] Furthermore, the fixture adopts a modular design: the positioning block 210 and the stand 240 of the positioning component are detachably mounted on the base plate 100, and the remaining parts are respectively assembled on the positioning block 210 and the stand 240; the bracket clamping mechanism 300 is detachably mounted on the base plate 100 via the fixing block 310, and the remaining parts are mounted on the fixing block 310; the nut clamping mechanism 400 is detachably mounted on the base plate 100 via the mounting plate 420, and the remaining parts are located on the lifting component 410. This layout allows for flexible assembly and disassembly of each component and mechanism on the base plate 100, quick switching and adjustment of relative positions, adapting to the clamping and positioning requirements of seat belt brackets 500 and nuts 600 of the same type but different specifications, realizing the sharing of fixtures for the same type of parts. On the one hand, it greatly improves the switching efficiency of the fixture and reduces the adjustment time; on the other hand, it avoids designing special fixtures for different specifications of parts, effectively reducing the production cost of special fixtures.

[0055] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A welding fixture for a seatbelt bracket and a nut, characterized in that, It includes a base plate, a positioning assembly, a bracket clamping mechanism, and a nut tightening mechanism. The base plate has multiple mounting holes, and the bracket clamping mechanism and the nut tightening mechanism are located on both sides of the positioning assembly. The positioning assembly includes a positioning block, a support plate, a positioning pin, and a stand. The positioning block and the stand are arranged adjacent to each other and detachably mounted on the base plate. The stand is used to support and position the side wall of the seat belt bracket. The top side of the positioning block is provided with a positioning pin. The support plate is provided with a through hole extending vertically. The positioning pin passes through the through hole and extends upward to position the seat belt bracket and the nut. One end of the support plate is mounted on the top of the positioning block to support the bottom of the seat belt bracket. The bracket clamping mechanism includes a fixed block, a translation component, a movable plate, a first clamping plate, and a clamping block. The fixed block is detachably mounted on the base plate. The translation component is mounted on the top of the fixed block, and its output end is connected to the movable plate. The first clamping plate and the clamping block are disposed on the movable plate. The first clamping plate is used to press the seat belt bracket onto the support plate, and the clamping block is used to press the side wall of the seat belt bracket onto the upright. The nut clamping mechanism includes a lifting component, a mounting plate, and a swing arm. The mounting plate is detachably mounted on the base plate. The lifting component is fixedly mounted on one side of the mounting plate, and its output end is hinged to one end of the swing arm. The lifting component drives one end of the swing arm to move upward, causing the other end of the swing arm to rotate downward, so as to clamp the nut onto the seat belt bracket.

2. The welding fixture for the seat belt bracket and nut according to claim 1, characterized in that: The translation direction of the bracket clamping mechanism is set at a certain angle with the central axis of the positioning component. It also includes a connecting block and a limiting block. One end of the connecting block is located on the moving plate. The limiting block and the clamping block are respectively located on both sides of the connecting block. The limiting block is used to position the outer wall of the nut.

3. The welding fixture for the seat belt bracket and nut according to claim 2, characterized in that: The bracket clamping mechanism further includes a stop block, which is mounted on the base plate and located between the positioning component and the bracket clamping mechanism, for limiting the travel of the moving plate.

4. The welding fixture for the seat belt bracket and nut according to claim 2, characterized in that: The bracket clamping mechanism further includes a second clamping plate, which is located on top of the movable plate and is used to position the top of the seat belt bracket.

5. The welding fixture for the seat belt bracket and nut according to claim 1, characterized in that: The base plate is mounted above the substrate via support columns, and the mounting plate is disposed on the bottom surface of the base plate, so that the lifting component is located between the base plate and the substrate. The nut clamping mechanism further includes a connecting seat and a connecting member. The connecting seat is located between the lifting member and the positioning component, and has an upwardly extending protrusion on the top side near the positioning component. The connecting member is H-shaped, with its lower end hinged to the connecting seat and its upper end hinged to the swing rod. The protrusion is used to limit the rotation angle of the connecting member.

6. The welding fixture for the seat belt bracket and nut according to claim 5, characterized in that: The free end of the rocker arm is a pressure block adapted to the shape of the top of the nut. The pressure block has a positioning hole that extends vertically through the nut. The positioning hole is directly opposite the top surface of the nut. A guide plate is provided on the top surface of the pressure block, and the guide plate has a guide hole that connects to the positioning hole. The top of the swing arm near the free end is provided with a downward recessed groove. A first connecting rod and a second connecting rod are hinged in the groove. One end of the first connecting rod is hinged to the second connecting rod, and the other end is hinged to the top of a positioning post. The bottom end of the positioning post passes through the guide hole and the positioning hole in sequence and abuts against the top of the nut. A boss extends radially from the outer periphery of the positioning post. The boss is located in the positioning hole. A spring is sleeved on the outer periphery of the positioning post. The two ends of the spring abut against the guide plate and the boss, respectively. A cover plate is also provided above the groove, which is used to limit the stroke of the positioning post; the end of the second connecting rod away from the first connecting rod is hinged to the side wall of the groove, and its free end is bent and extends out of the groove, and abuts against the end of the cover plate away from the first connecting rod.

7. The welding fixture for the seat belt bracket and nut according to claim 1, characterized in that: At least one support block is provided on the inner wall of the stand near the positioning block. The top surface of the support block is higher than the top surface of the positioning pin. Stop blocks are provided on both sides of the stand. The two stop blocks are used to limit the front and rear ends of the seat belt bracket.

8. The welding fixture for the seat belt bracket and nut according to any one of claims 1 to 7, characterized in that: The positioning component, the bracket clamping mechanism, and the nut pressing mechanism are each provided in two sets, and are respectively located on the left and right sides of the base plate.

9. The welding fixture for the seat belt bracket and nut according to claim 1, characterized in that: The translation and lifting components are cylinders.

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