Welding jig for spot welding machine

Abstract

The utility model belongs to the technical field of circuit board welding equipment, and discloses a welding jig for a spot welding machine, which comprises a base plate body, a movable positioning component and a pressing component, and the movable positioning component and the pressing component are both fixed on the base plate body; the base plate body is provided with an electric welding through groove frame used for providing an operation space for an electric welding machine. The movable positioning assembly comprises a pair of linear guide rail mechanisms, a block-up block, a first guide sliding rail, a positioning block, a fixing base and a second guide sliding rail, the pair of linear guide rail mechanisms are fixed to the base plate body and arranged on the left side and the right side of the electric welding through groove frame correspondingly, and the block-up block is connected to the pair of linear guide rails; and the pair of linear guide rails is fixedly connected with the first guide slide rail through the block-up block. According to the utility model, circuit boards with different sizes are compatible through X-Y-axis bidirectional adjustment and a four-point positioning structure, and the consistency of welding positions is remarkably improved by combining the embedded guide rail and the stop screw for locking.

Description

Technical Field

[0001] This utility model belongs to the technical field of circuit board welding equipment, and more specifically, it relates to a welding fixture for a spot welding machine. Background Technology

[0002] In the field of circuit board welding equipment technology, spot welding machine fixtures are core equipment for positioning electronic components and circuit boards during welding. Their positioning accuracy and compatibility directly affect welding quality and production efficiency. Traditional welding fixtures mostly adopt fixed rigid positioning structures, using preset holes or stops to limit the circuit board in one direction, which has the following technical drawbacks:

[0003] 1. Insufficient size adaptability: The fixed positioning structure cannot be compatible with circuit boards of different specifications. When switching products on the production line, the fixtures need to be changed frequently, resulting in low equipment utilization and time-consuming changeover.

[0004] 2. Limited positioning accuracy: Single-sided or two-point positioning methods are prone to micro-displacement of the circuit board during the soldering process, especially when soldering at multiple points, which can easily lead to cumulative errors and poor consistency of solder joint positions.

[0005] 3. Poor rigidity of the adjustment mechanism: Most existing adjustable fixtures use a sliding groove and bolt locking structure. After adjustment, they are prone to displacement due to vibration or external force, and repeated adjustment can easily lead to thread wear and insufficient positioning stability.

[0006] 4. Insufficient compatibility of press-fit components: Traditional press-fit components lack a dynamic pressure compensation mechanism, which can easily lead to local stress concentration when pressing uneven or irregularly shaped components, resulting in component damage or poor soldering.

[0007] While some improvement solutions attempt to introduce movable guide rail structures, most are limited to single-axis adjustment and lack precise locking mechanisms, making it difficult to simultaneously meet the dual requirements of multi-size compatibility and welding precision. Furthermore, the existing fixtures' open working space design is insufficient, easily interfering with the welding torch's movement trajectory and further limiting welding efficiency. Therefore, there is an urgent need for a welding fixture that combines multi-directional precise adjustment, stable locking, and flexible pressing functions to improve the consistency of welding processes and the versatility of equipment.

[0008] Therefore, this utility model provides a welding fixture for a spot welding machine. Utility Model Content

[0009] In view of the above-mentioned problems of the existing technology, the purpose of this utility model is to provide a welding fixture for a spot welding machine, which is compatible with circuit boards of different sizes through bidirectional adjustment of XY axis and four-point positioning structure, and significantly improves the consistency of welding position by combining interlocking guide rail and locking screw.

[0010] The objective of this utility model can be achieved through the following technical solutions:

[0011] A welding fixture for a spot welding machine includes a base plate, a movable positioning component for fixing a circuit board, and a pressing component for positioning electronic components on the circuit board that need to be welded. The movable positioning component and the pressing component are both fixed on the base plate.

[0012] The base plate is provided with a welding through groove frame for providing working space for the welding machine;

[0013] The movable positioning component includes a pair of linear guide rail mechanisms, a shim block, a first guide rail, a positioning block, a fixing seat, and a second guide rail. The pair of linear guide rail mechanisms are fixed on the base plate and respectively placed on the left and right sides of the welding slot frame. Each pair of linear guide rails is connected to a shim block. The pair of linear guide rails are fixedly connected to the first guide rail via the shim blocks. The first guide rail is placed on the front side of the welding slot frame. A pair of positioning blocks are provided inside the first guide rail. The second guide rail is fixedly connected to the fixing seat. The second guide rail is fixed on the base plate via the fixing seat and placed on the rear side of the welding slot frame. A pair of positioning blocks are also provided inside the second guide rail. The movable positioning component positions and fixes the circuit board through the two pairs of positioning blocks.

[0014] As a further preferred technical solution of this utility model, the pressing assembly includes a pressing plate, a fixing post, and a fixing ring. The pressing plate has a first mounting hole at each of its four corners. The pressing plate is connected to the fixing post through the first mounting hole. The upper end of the fixing post is a threaded post. The threaded post of the fixing post corresponds one-to-one with the first mounting hole of the pressing plate. The fixing ring has a threaded through hole at its center. The fixing ring is screwed to the threaded post of the fixing post through the threaded through hole.

[0015] The fixing column is fixedly connected to the base plate, and a regular hexagonal groove is formed on the side of the fixing ring.

[0016] As a further preferred technical solution of this utility model, the pressing assembly further includes a plurality of elastic plunger pins, and the pressing plate body is also provided with a plurality of second mounting holes. The plurality of elastic plunger pins correspond to the plurality of second mounting holes, and the elastic plunger pins are connected to the pressing plate body through the corresponding second mounting holes.

[0017] As a further preferred technical solution of this utility model, the pressing assembly further includes a plurality of rubber pressure heads, each corresponding to a plurality of elastic plunger pins, and is disposed at one end of the corresponding plurality of elastic plunger pins near the base plate.

[0018] As a further preferred technical solution of this utility model, the pressed plate body is provided with a number of hollow areas.

[0019] As a further preferred technical solution of this utility model, the linear guide mechanism includes a fitting guide rail and a slider. The fitting guide rail is fitted with the slider. The fitting guide rail is provided with a number of stepped holes at equal intervals. The fitting guide rail is fixed to the base plate by the number of stepped holes and cup head screws.

[0020] The upper surface of the slider is provided with a first screw hole, and the slider is fixedly connected to the shim block through the first screw hole. The side of the slider is provided with a first screw through hole, and the slider is fixed to the fitting guide rail through the first screw through hole and a stop screw.

[0021] As a further preferred technical solution of this utility model, the raised block is also provided with a second screw hole, and both ends of the first guide slide rail are provided with a third screw hole. The raised block and the first guide slide rail are connected through the second screw hole and the third screw hole.

[0022] The fixed base has a cross-section that is roughly convex. The fixed base has a fourth screw hole and is fixed to the base plate through the fourth screw hole. The fixed base also has a fifth screw hole. Both ends of the second guide slide rail have sixth screw holes. The fixed base and the second guide slide rail are connected through the fifth screw hole and the sixth screw hole.

[0023] As a further preferred technical solution of this utility model, both the first guide slide rail and the second guide slide rail are provided with irregularly shaped recessed through grooves.

[0024] The positioning block is provided with a positioning pin, which positions the circuit board. The positioning block is also provided with a shaped boss, which engages with the shaped recessed groove of the first guide rail or the second guide rail. The positioning block is provided with a second screw hole, which is fixed to the first guide rail or the second guide rail through the second screw hole and a locking screw.

[0025] As described above, the welding fixture for a spot welding machine provided by this utility model has the following beneficial effects:

[0026] This utility model utilizes the aforementioned welding fixture for a spot welding machine. Compared with the prior art, due to the adoption of this structure, the combination design of the linear guide rail mechanism, the first guide rail, and the second guide rail in the movable positioning component enables bidirectional adjustment of the XY axis. Furthermore, both the front first guide rail and the rear second guide rail are equipped with two positioning blocks, forming a four-point positioning structure, which can be compatible with the precise positioning of circuit boards of different sizes. In addition, the guide rail mechanism also adopts an interlocking guide rail with locking screws, which significantly improves the consistency of welding position.

[0027] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, 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.

[0029] Figure 1 This is a schematic diagram of the structure of a welding fixture for a spot welding machine according to this utility model application;

[0030] Figure 2 This is a top view of a welding fixture for a spot welding machine according to this utility model application;

[0031] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0032] Figure 4 This is a schematic diagram of the pressing plate of a welding fixture for a spot welding machine according to this utility model application;

[0033] Figure 5 This is a schematic diagram of the structure of a fixing ring for a welding fixture used in a spot welding machine, as per this utility model application.

[0034] Figure 6 This is a schematic diagram of the structure of a positioning block for a welding fixture used in a spot welding machine, as per this utility model application.

[0035] Figure 7 This is a schematic diagram of the structure of a first guide rail or a second guide rail for a welding fixture used in a spot welding machine, which is the subject of this utility model application.

[0036] Summary of figure labels and their descriptions:

[0037] 100. Base plate; 110. Welded through-slot frame; 200. Movable positioning component; 210. Linear guide mechanism; 211. Fitting guide rail; 212. Slider; 220. Elevating block; 230. First guide rail; 240. Positioning block; 241. Positioning pin; 242. Irregular boss; 250. Fixing seat; 260. Second guide rail; 261. Irregular recessed through-slot; 300. Pressing component; 310. Pressing plate; 311. First mounting hole; 312. Second mounting hole; 313. Hollowed-out area; 320. Fixing post; 321. Threaded post; 330. Fixing ring; 331. Threaded through hole; 332. Regular hexagonal slot; 400. Elastic plunger pin; 500. Rubber pressure head; 600. Circuit board; 700. Electronic component. Detailed Implementation

[0038] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0039] It should be noted that the structures, proportions, and sizes depicted in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention. Specific structures can be described with reference to the accompanying drawings of the patent application.

[0040] This utility model provides a welding fixture for a spot welding machine. Please refer to [link / reference]. Figures 1 to 7 As shown, it includes a base plate 100, a movable positioning component 200 for fixing a circuit board 600, and a pressing component 300 for positioning electronic components 700 that need to be soldered on the circuit board 600. The movable positioning component 200 and the pressing component 300 are both fixed on the base plate 100.

[0041] The base plate 100 is provided with a welding through groove frame 110 for providing working space for the welding machine;

[0042] The movable positioning component 200 includes a pair of linear guide rail mechanisms 210, a shim block 220, a first guide rail 230, a positioning block 240, a fixing base 250, and a second guide rail 260. The pair of linear guide rail mechanisms 210 are fixed on the base plate 100 and respectively positioned on the left and right sides of the welding channel frame 110. Each of the pair of linear guide rails is connected to a shim block 220. The pair of linear guide rails are fixedly connected to the first guide rail 230 via the shim block 220. The first guide rail 230, located on the front side of the welding channel frame 110, is provided with a pair of positioning blocks 240. The second guide rail 260 is fixedly connected to the fixed seat 250. The second guide rail 260 is fixed to the base plate 100 by the fixed seat 250 and located on the rear side of the welding channel frame 110. The second guide rail 260 is also provided with a pair of positioning blocks 240. The movable positioning component 200 positions and fixes the circuit board 600 by the two pairs of positioning blocks 240.

[0043] It should be noted that: This utility model achieves multi-dimensional flexible adjustment of the circuit board 600 through the movable positioning component 200 (including linear guide rail, shim block 220, guide slide rail, etc.), adapting to the positioning requirements of circuit boards 600 of different sizes. In addition, the front and rear double guide slide rails cooperate with the positioning block 240 to achieve precise positioning of the four corners of the circuit board 600, ensuring accurate alignment of electronic components 700 and solder points during welding. Furthermore, the welding through slot frame 110 provides open space for welding operations, avoiding interference of the fixture structure with the movement of the welding gun, and improving welding accuracy and efficiency.

[0044] The pressing assembly 300 includes a pressing plate 310, a fixing post 320, and a fixing ring 330. The pressing plate 310 has a first mounting hole 311 at each of its four corners. The pressing plate 310 is connected to the fixing post 320 through the first mounting hole 311. The upper end of the fixing post 320 is a threaded post 321. The threaded post 321 of the fixing post 320 corresponds one-to-one with the first mounting hole 311 of the pressing plate 310. The fixing ring 330 has a threaded through hole 331 at its center. The fixing ring 330 is screwed to the threaded post 321 of the fixing post 320 through the threaded through hole 331.

[0045] The fixed column 320 is fixedly connected to the base plate 100. A regular hexagonal slot 332 is opened on the side of the fixed ring 330. The welding through slot frame 110 provides open space for welding operations, avoids interference of the fixture structure with the movement of the welding gun, and improves welding accuracy and efficiency.

[0046] The pressing assembly 300 also includes a plurality of elastic plunger pins 400, and the pressing plate 310 is provided with a plurality of second mounting holes 312. The plurality of elastic plunger pins 400 correspond to the plurality of second mounting holes 312, and the elastic plunger pins 400 are connected to the pressing plate 310 through the corresponding second mounting holes 312. The elastic plunger pins 400 provide dynamic pressure compensation, automatically balancing the force on components of different heights during the pressing process, avoiding poor soldering or pressure damage caused by differences in component height, and the elastic support reduces the impact of mechanical vibration on the welding quality, which is especially suitable for welding scenarios of precision electronic components 700.

[0047] The pressing assembly 300 also includes a plurality of rubber pressure heads 500, which correspond one-to-one with the plurality of elastic plunger pins 400 and are disposed at the end of the corresponding elastic plunger pins 400 near the base plate 100. The rubber pressure heads 500 serve as a buffer medium, protecting the surface of the electronic components 700 from rigid compression damage and preventing component displacement by increasing the coefficient of friction. Furthermore, rubber heads of different hardness (such as silicone or fluororubber) can be replaced according to the component material to expand the compatibility of the fixture.

[0048] The press plate 310 has several hollow areas 313. The hollow areas 313 not only reduce the overall weight of the fixture, making it easier for manual handling and quick changes on the production line, but also improve heat dissipation performance and prevent the fixture from deforming due to high welding temperatures.

[0049] The linear guide mechanism 210 includes a fitting guide rail 211 and a slider 212. The fitting guide rail 211 and the slider 212 are fitted together. The fitting guide rail 211 has a number of stepped holes evenly spaced. The fitting guide rail 211 is fixed to the base plate 100 through the stepped holes and cup head screws.

[0050] The upper surface of the slider 212 is provided with a first screw hole, and the slider 212 is fixedly connected to the shim block 220 through the first screw hole. The side of the slider 212 is provided with a first screw through hole, and the slider 212 is fixed to the fitting guide rail 211 through the first screw through hole and the locking screw.

[0051] The shim block 220 is also provided with a second screw hole, and both ends of the first guide slide rail 230 are provided with a third screw hole. The shim block 220 and the first guide slide rail 230 are connected through the second screw hole and the third screw hole.

[0052] The fixed base 250 has a cross-section that is roughly convex. The fixed base 250 is provided with a fourth screw hole, and the fixed base 250 is fixed to the base plate 100 through the fourth screw hole. The fixed base 250 is also provided with a fifth screw hole. The second guide slide rail 260 has a sixth screw hole at both ends. The fixed base 250 and the second guide slide rail 260 are connected through the fifth screw hole and the sixth screw hole.

[0053] Both the first guide slide rail 230 and the second guide slide rail 260 are provided with irregularly shaped recessed through grooves 261;

[0054] The positioning block 240 is provided with a positioning pin 241, which positions the circuit board 600. The positioning block 240 is also provided with a shaped boss 242, which engages with the shaped recessed through groove 261 of the first guide rail 230 or the second guide rail 260 through the shaped boss 242. The positioning block 240 is provided with a second screw-in through hole, which is used to fix the positioning block 240 to the first guide rail 230 or the second guide rail 260 through the second screw-in through hole and a locking screw.

[0055] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A welding fixture for a spot welding machine, characterized in that, It includes a base plate, a movable positioning component for fixing a circuit board, and a pressing component for positioning electronic components on the circuit board that need to be soldered. The movable positioning component and the pressing component are both fixed on the base plate. The base plate is provided with a welding through groove frame for providing working space for the welding machine; The movable positioning component includes a pair of linear guide rail mechanisms, a shim block, a first guide rail, a positioning block, a fixing seat, and a second guide rail. The pair of linear guide rail mechanisms are fixed on the base plate and respectively placed on the left and right sides of the welding slot frame. Each pair of linear guide rails is connected to a shim block. The pair of linear guide rails are fixedly connected to the first guide rail via the shim blocks. The first guide rail is placed on the front side of the welding slot frame. A pair of positioning blocks are provided inside the first guide rail. The second guide rail is fixedly connected to the fixing seat. The second guide rail is fixed on the base plate via the fixing seat and placed on the rear side of the welding slot frame. A pair of positioning blocks are also provided inside the second guide rail. The movable positioning component positions and fixes the circuit board through the two pairs of positioning blocks.

2. The welding fixture for a spot welding machine according to claim 1, characterized in that, The pressing assembly includes a pressing plate, a fixing post, and a fixing ring. The pressing plate has a first mounting hole at each of its four corners. The pressing plate is connected to the fixing post through the first mounting hole. The upper end of the fixing post is a threaded post. The threaded post of the fixing post corresponds one-to-one with the first mounting hole of the pressing plate. The fixing ring has a threaded through hole at its center. The fixing ring is screwed to the threaded post of the fixing post through the threaded through hole. The fixing column is fixedly connected to the base plate, and a regular hexagonal groove is formed on the side of the fixing ring.

3. A welding fixture for a spot welding machine according to claim 2, characterized in that, The pressing assembly further includes several elastic plunger pins, and the pressing plate body is provided with several second mounting holes. The several elastic plunger pins correspond to the several second mounting holes, and the elastic plunger pins are connected to the pressing plate body through the corresponding second mounting holes.

4. A welding fixture for a spot welding machine according to claim 3, characterized in that, The pressing assembly also includes several rubber pressure heads, which correspond one-to-one with several elastic plunger pins and are disposed at one end of the corresponding elastic plunger pins near the base plate.

5. A welding fixture for a spot welding machine according to claim 2, characterized in that, The pressed plate has several hollow areas.

6. A welding fixture for a spot welding machine according to claim 1, characterized in that, The linear guide mechanism includes a mating guide rail and a slider. The mating guide rail is mated with the slider. The mating guide rail has a number of stepped holes evenly spaced. The mating guide rail is fixed to the base plate by the stepped holes and cup head screws. The upper surface of the slider is provided with a first screw hole, and the slider is fixedly connected to the shim block through the first screw hole. The side of the slider is provided with a first screw through hole, and the slider is fixed to the fitting guide rail through the first screw through hole and a stop screw.

7. A welding fixture for a spot welding machine according to claim 1, characterized in that, The raised block is also provided with a second screw hole, and both ends of the first guide slide rail are provided with a third screw hole. The raised block and the first guide slide rail are connected through the second screw hole and the third screw hole. The fixed base has a cross-section that is roughly convex. The fixed base has a fourth screw hole and is fixed to the base plate through the fourth screw hole. The fixed base also has a fifth screw hole. Both ends of the second guide slide rail have sixth screw holes. The fixed base and the second guide slide rail are connected through the fifth screw hole and the sixth screw hole.

8. A welding fixture for a spot welding machine according to claim 1, characterized in that, Both the first guide rail and the second guide rail are provided with irregularly shaped recessed through grooves; The positioning block is provided with a positioning pin, which positions the circuit board. The positioning block is also provided with a shaped boss, which engages with the shaped recessed groove of the first guide rail or the second guide rail. The positioning block is provided with a second screw hole, which is fixed to the first guide rail or the second guide rail through the second screw hole and a locking screw.

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