Detection jig for printed circuit board

Abstract

The utility model relates to the related technical field of industrial detection jigs, in particular to a detection jig for a printed circuit board, which comprises a base, one end of the base is fixedly connected with a back plate, one side of the back plate is provided with an executing mechanism, and one end of the base is provided with a fixing mechanism. The position of the sliding rod can be adjusted according to the width of the printed circuit board by placing the printed circuit board at a proper position on the base, loosening the second bolts on the two sides of the fixing frame, so that the sliding rod can adapt to the size of the printed circuit board, tightening the second bolts, fixing the sliding rod at the current position, rotating the third bolt and pushing the sliding block; the sliding block is tightly attached to the printed circuit board, so that the printed circuit board is fixed, rotation of the lead screw enables the lower pressing plate to move downwards along the fixing shaft, when the lower pressing plate moves and the probe makes contact with the printed circuit board, related detection work can be started, and the detection efficiency of the printed circuit board is greatly improved.

Description

Technical Field

[0001] This utility model relates to the technical field of industrial testing fixtures, and in particular to a testing fixture for printed circuit boards. Background Technology

[0002] Traditional testing fixtures are common tools in industrial manufacturing, electronic component testing, and precision machining, primarily used for standardized testing of product dimensions, performance parameters, and assembly positions. Originally designed to meet the quality control needs of specific products in fixed production processes, early fixtures often used aluminum alloys and steel as the main materials, with structures consisting mainly of fixed clamps and rigid probes, relying on manual operation or simple mechanical transmission to perform the testing. However, as the manufacturing industry has evolved towards multi-variety, small-batch, and high-precision production, the limitations of traditional fixtures have become increasingly apparent. They are ill-suited to the new demands of complex surface testing, flexible production, and refined quality control. Therefore, a testing fixture specifically for printed circuit boards is needed.

[0003] However, existing printed circuit board (PCB) testing fixtures are often designed for specific applications, with fixed probe angles and clamp dimensions. This limits their application to products of a single specification or similar shape. For irregular surfaces or multi-model products on the same line, frequent fixture changes or custom-made fixtures are required, which is time-consuming, labor-intensive, and costly. Furthermore, existing fixtures typically use ordinary threaded drives or rigid connection structures, lacking efficient guiding support. Long-term use can lead to probe positioning deviations due to friction wear and component deformation, affecting the reliability of test data. The clamping mechanisms of existing fixtures are mostly single-sided rigid clamping, which can cause uneven force or deformation on the tested item, potentially damaging the product during testing and affecting the efficiency of PCB testing. Utility Model Content

[0004] The purpose of this utility model is to provide a testing fixture for printed circuit boards (PCBs) to solve the problems mentioned in the background art regarding existing PCB industrial testing fixtures. These fixtures are mostly designed for a one-to-one basis, with fixed probe angles and clamp dimensions, making them only suitable for testing products of a single specification or similar shape. For irregular surfaces or multi-model products testing on the same line, frequent fixture changes or custom-made fixtures are required, which is time-consuming, labor-intensive, and costly. Furthermore, existing fixtures typically use ordinary threaded drives or rigid connection structures, lacking efficient guiding support. Long-term use can lead to probe positioning deviations due to friction wear and component deformation, affecting the reliability of testing data. The clamping mechanisms of existing fixtures are mostly single-sided rigid clamping, which can easily cause uneven force or deformation on the tested item, potentially damaging the product during testing and affecting the efficiency of PCB testing.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a testing fixture for printed circuit boards, comprising a base, a back plate fixedly connected to one end of the base, an execution mechanism provided on one side of the back plate, and a fixing mechanism provided at one end of the base;

[0006] The actuator includes a fixed block, a drive motor, a lead screw, a lower pressure plate, a fixed shaft, a narrow plate, a first bolt, and a probe. The drive motor is fixedly connected to one side of the back plate, the output end of the drive motor is fixedly connected to the lead screw, the lower pressure plate is threaded to one side of the lead screw, the fixed shaft is fixedly connected to one end of the base surface, the narrow plate is fixedly connected to one end of the lower pressure plate, the first bolt is movably sleeved on the other end of the lower pressure plate, and the probe is fixedly connected to one end of the narrow plate.

[0007] The fixing mechanism includes a fixing frame, a second bolt, a sliding rod, a third bolt, and a sliding block. The fixing frame is fixedly connected to one end of the base surface. The second bolt is slidably connected to both sides of the fixing frame. The sliding rod is threaded to one side of the surface of the second bolt. The third bolt is threaded to one side of the sliding rod. The sliding block is attached to one end of the third bolt.

[0008] Preferably, the lead screw is connected to the base bearing, and the lower pressure plate is slidably connected to the fixed shaft.

[0009] Preferably, the fixing block is connected to the lead screw bearing, and the fixing shaft is configured in two sets.

[0010] Preferably, the narrow plate is movably sleeved with the first bolt.

[0011] Preferably, the fixing frame is slidably connected to the sliding block, and the sliding rod is configured in two sets.

[0012] Preferably, the fixing frame is made of phenolic plastic, and the base is made of phenolic plastic and carbon fiber reinforced plastic.

[0013] Preferably, the sliding block is made of rubber.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This testing fixture for printed circuit boards, through the bearing connection between the lead screw and the base and the fixing block, and with the assistance of two sets of fixed shaft guide pressure plates, reduces movement deviation, making the probe positioning more accurate. Long-term use is less prone to testing errors due to friction or uneven force. The probe angle can be adjusted via movable bolts to adapt to irregular surfaces. Furthermore, the sliding rod and rubber sliding block of the fixing mechanism support bidirectional clamping of items of different sizes, avoiding the limitations of traditional fixtures in fixing dimensions. The base is made of phenolic plastic carbon fiber reinforced material, which is high-temperature resistant and impact-resistant. In addition, the rubber sliding block does not damage the surface of the item when clamping. The probe angle and the position of the fixing mechanism can be quickly adjusted according to actual needs, reducing operation time and difficulty, and greatly improving the testing efficiency of printed circuit boards. Attached Figure Description

[0015] Figure 1 This is a side view of the appearance structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the interaction between the actuator and the base of this utility model;

[0017] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A in the middle;

[0018] Figure 4 This utility model Figure 2 Enlarged structural diagram at point B;

[0019] Figure 5 This utility model Figure 2 Enlarged structural diagram at point C.

[0020] In the diagram: 1. Base; 2. Back plate; 3. Actuator; 301. Fixing block; 302. Drive motor; 303. Lead screw; 304. Lower pressure plate; 305. Fixing shaft; 306. Narrow plate; 307. First bolt; 308. Probe; 4. Fixing mechanism; 401. Fixing frame; 402. Second bolt; 403. Sliding rod; 404. Third bolt; 405. Sliding block. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-5This utility model provides a technical solution: a testing fixture for printed circuit boards, including a base 1, a back plate 2 fixedly connected to one end of the base 1, an execution mechanism 3 provided on one side of the back plate 2, and a fixing mechanism 4 provided at one end of the base 1.

[0023] The actuator 3 includes a fixed block 301, a drive motor 302, a lead screw 303, a lower pressure plate 304, a fixed shaft 305, a narrow plate 306, a first bolt 307, and a probe 308. The drive motor 302 is fixedly connected to one side of the back plate 2. The lead screw 303 is fixedly connected to the output end of the drive motor 302. The lower pressure plate 304 is threaded onto one side of the surface of the lead screw 303. The fixed shaft 305 is fixedly connected to one end of the surface of the base 1. The narrow plate 306 is fixedly connected to one end of the lower pressure plate 304. The other end is movably fitted with the first bolt 307, and one end of the narrow plate 306 is fixedly connected with the probe 308. During use, the drive motor 302 can be started, and the drive motor 302 drives the lead screw 303 to rotate. The rotation of the lead screw 303 will cause the lower pressure plate 304 to move downward along the fixed shaft 305. When the lower pressure plate 304 moves, the narrow plate 306 and the probe 308 on the narrow plate 306 at one end also move downward. When the probe 308 contacts the printed circuit board, the relevant testing work can begin.

[0024] The fixing mechanism 4 includes a fixing frame 401, a second bolt 402, a sliding rod 403, a third bolt 404, and a sliding block 405. The fixing frame 401 is fixedly connected to one end of the surface of the base 1. The second bolt 402 is slidably connected to both sides of the fixing frame 401. The sliding rod 403 is threadedly connected to one side of the surface of the second bolt 402. The third bolt 404 is threadedly connected to one side of the sliding rod 403. The sliding block 405 is attached to one end of the third bolt 404. During use, the printed circuit board can be placed in a suitable position on the base 1, the second bolts 402 on both sides of the fixing frame 401 can be loosened, the position of the sliding rod 403 can be adjusted according to the width of the printed circuit board so that the sliding rod 403 can adapt to the size of the printed circuit board, the second bolt 402 can be tightened to fix the sliding rod 403 in the current position, and the third bolt 404 can be rotated to push the sliding block 405 so that the sliding block 405 fits tightly against the printed circuit board, thereby fixing the printed circuit board.

[0025] Furthermore, the lead screw 303 is connected to the base 1 by a bearing, and the lower pressure plate 304 is slidably connected to the fixed shaft 305. Through the setting of the lead screw 303 and the base 1, the bearing connection reduces the frictional resistance when the lead screw 303 rotates, making the power transmission of the drive motor 302 more efficient and reducing energy loss. At the same time, the bearing support can prevent the lead screw 303 from radially offset due to gravity or load, ensuring that the lower pressure plate 304 rises and falls smoothly in the vertical direction, improving the positioning accuracy of the probe 308. Through the setting of the lower pressure plate 304 and the fixed shaft 305, the fixed shaft 305 provides guide support for the lower pressure plate 304. The sliding connection structure restricts the circumferential rotation of the lower pressure plate 304 when the lead screw 303 rotates, ensuring that it only moves linearly along the axial direction of the fixed shaft 305, avoiding detection deviation caused by the shaking of the probe 308, and improving the stability of the detection process.

[0026] Furthermore, the fixing block 301 is connected to the lead screw 303 by a bearing, and the fixing shaft 305 is set in two sets. Through the setting of the fixing block 301 and the lead screw 303, the fixing block 301 fixes the end of the lead screw 303 through the bearing, and shares the axial load of the lead screw 303, preventing the lead screw 303 from bending and deforming due to long-term stress. The setting of two sets of fixing shafts 305, in conjunction with the design of two sets of fixing shafts 305, forms a symmetrical support structure, which enhances the anti-tilting ability of the lower pressure plate 304 during movement, and is suitable for high-precision detection scenarios.

[0027] Furthermore, the narrow plate 306 is movably connected to the first bolt 307. Through the setting of the narrow plate 306 and the first bolt 307, the narrow plate 306 can rotate freely around the first bolt 307, allowing the probe 308 to adjust its angle according to the detection requirements, adapting to printed circuit boards of different shapes or inclined surfaces, improving the versatility of the device. In addition, the movable connection structure facilitates quick disassembly and replacement of the probe 308 during later maintenance.

[0028] Furthermore, the fixing frame 401 is slidably connected to the sliding block 405, and the sliding rod 403 is set in two sets. With the setting of the fixing frame 401 and the sliding block 405, the fixing frame 401 can slide inside one side of the fixing frame 401, thereby achieving the effect of fixing the printed circuit board. With the setting of the two sets of sliding rods 403, the sliding block 405 and the fixing frame 401 slide in cooperation with the two sets of sliding rods 403, which can clamp the printed circuit board of different widths in both directions symmetrically, avoiding the offset of the printed circuit board caused by unilateral force.

[0029] Furthermore, the fixing frame 401 is made of phenolic plastic, and the base 1 is made of phenolic plastic carbon fiber reinforced plastic. With the phenolic plastic fixing frame 401, phenolic plastic has the characteristics of high temperature resistance, good insulation and chemical corrosion resistance, and is suitable for long-term use in harsh environments, thus extending the life of the device. With the phenolic plastic carbon fiber reinforced plastic base 1, the base 1 is made of phenolic plastic carbon fiber reinforced material, which significantly improves the structural strength and impact resistance while maintaining the lightweight characteristics, ensuring the overall stability of the device and reducing detection errors caused by vibration.

[0030] Furthermore, the sliding block 405 is made of rubber. With the setting of the rubber sliding block 405, the surface friction of the rubber sliding block 405 is large, which can provide stable clamping force without damaging the surface of the printed circuit board. The elastic deformation characteristics of rubber can also compensate for the dimensional tolerance of the printed circuit board and improve the compatibility of the fixing mechanism.

[0031] Working principle: During use, the printed circuit board (PCB) can be placed in a suitable position on the base 1. Loosen the second bolts 402 on both sides of the fixing bracket 401, adjust the position of the sliding rod 403 according to the width of the PCB, so that the sliding rod 403 can adapt to the size of the PCB, tighten the second bolts 402 to fix the sliding rod 403 in the current position, rotate the third bolt 404 to push the sliding block 405, so that the sliding block 405 fits tightly against the PCB, thereby fixing the PCB. The drive motor 302 can be started to drive the lead screw 303 to rotate. The rotation of the lead screw 303 will cause the lower pressure plate 304 to move downward along the fixed shaft 305. When the lower pressure plate 304 moves, the narrow plate 306 at one end and the probe 308 of the narrow plate 306 also move downward. When the probe 308 contacts the PCB, the relevant testing work can be started, which greatly improves the testing efficiency of the PCB.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A testing fixture for printed circuit boards, comprising a base (1), characterized in that: One end of the base (1) is fixedly connected to a back plate (2), an actuator (3) is provided on one side of the back plate (2), and a fixing mechanism (4) is provided on one end of the base (1); The actuator (3) includes a fixed block (301), a drive motor (302), a lead screw (303), a lower pressure plate (304), a fixed shaft (305), a narrow plate (306), a first bolt (307), and a probe (308). The drive motor (302) is fixedly connected to one side of the back plate (2). The lead screw (303) is fixedly connected to the output end of the drive motor (302). The lower pressure plate (304) is threadedly connected to one side of the surface of the lead screw (303). The fixed shaft (305) is fixedly connected to one end of the surface of the base (1). The narrow plate (306) is fixedly connected to one end of the lower pressure plate (304). The first bolt (307) is movably sleeved on the other end of the lower pressure plate (304). The probe (308) is fixedly connected to one end of the narrow plate (306). The fixing mechanism (4) includes a fixing frame (401), a second bolt (402), a sliding rod (403), a third bolt (404), and a sliding block (405). The fixing frame (401) is slidably connected to both sides of the second bolt (402). The sliding rod (403) is threadedly connected to one side of the surface of the second bolt (402). The third bolt (404) is threadedly connected to one side of the sliding rod (403). The sliding block (405) is attached to one end of the third bolt (404).

2. The testing fixture for printed circuit boards according to claim 1, characterized in that: The lead screw (303) is connected to the base (1) by a bearing, and the lower pressure plate (304) is slidably connected to the fixed shaft (305).

3. The testing fixture for printed circuit boards according to claim 1, characterized in that: The fixed block (301) is connected to the lead screw (303) bearing, and the fixed shaft (305) is set in two sets.

4. The testing fixture for printed circuit boards according to claim 1, characterized in that: The narrow plate (306) is movably connected to the first bolt (307).

5. A testing fixture for printed circuit boards according to claim 1, characterized in that: The fixed frame (401) is slidably connected to the sliding block (405), and the sliding rod (403) is configured in two sets.

6. A testing fixture for printed circuit boards according to claim 1, characterized in that: The fixing frame (401) is made of phenolic plastic, and the base (1) is made of phenolic plastic and carbon fiber reinforced plastic.

7. A testing fixture for printed circuit boards according to claim 1, characterized in that: The sliding block (405) is made of rubber.

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