Experimental fixture for on-off detection of pcb board material

Abstract

The utility model discloses a kind of pcb board material on-off detection experimental fixtures, it is related to pcb board material technical field, including pedestal, detection mechanism and positioning mechanism, pedestal is provided with connecting column, connecting column detachably connects the detection mechanism, pedestal detachably connects positioning mechanism;Positioning mechanism includes locating plate, elastic fixing block, notched two, guide rod, sliding block, gyro wheel guide block and pressure spring, two notches two are set in pedestal bottom, guide rod is fixedly connected in notched two, guide rod both sides are slidably connected sliding block, sliding block is fixedly connected locating plate, locating plate is fixedly connected elastic fixing block, the pressure spring sleeve guide rod, pressure spring both ends are fixedly connected with the inboard of two sides locating plate respectively, locating plate other side is fixedly connected guide block, guide block is rollingly connected gyro wheel;Through wedge abuts gyro wheel and drives locating plate displacement, handle is pressed down simultaneously, positioning mechanism is positioned to pcb board material.

Description

Technical Field

[0001] This utility model relates to the field of PCB board technology, specifically to a test fixture for testing the continuity of PCB boards. Background Technology

[0002] PCBs are one of the core components of electronic devices, used for mechanical support and electrical connection of electronic components. The development of PCB technology is essentially driven by the miniaturization, functional integration, and high-speed performance of electronic devices. From "electrical interconnection" to "system integration," PCBs have evolved from simple signal transmission carriers into hybrid integrated platforms that include passive components and even chips. Flexible and foldable PCBs are driving innovation in the form of electronic devices and enabling intelligent sensing in conjunction with sensors.

[0003] PCB board inspection is a crucial step in ensuring the quality and reliability of circuit boards. As the core carrier of electronic devices, the continuity of the circuits in the PCB directly affects product performance. The purpose of continuity testing is to identify open or short circuit defects in the circuitry, preventing equipment malfunctions caused by circuit faults. These defects may be caused by manufacturing process errors, material defects, or accidental damage during assembly. Utility Model Content

[0004] The purpose of this invention is to provide a test fixture for testing the continuity of PCB boards, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A test fixture for testing the continuity of PCB boards includes a base, a testing mechanism, and a positioning mechanism. The base is provided with a connecting column, which is detachably connected to the testing mechanism. The base is detachably connected to the positioning mechanism. The positioning mechanism includes a positioning plate, an elastic fixing block, two slots, a guide rod, a slider, a roller guide block, and a pressure spring. Two slots are opened at the bottom of the base. The guide rod is fixedly connected to the slots. The slider is slidably connected to both sides of the guide rod. The slider is fixedly connected to the positioning plate. The positioning plate is fixedly connected to the elastic fixing block. The pressure spring is sleeved on the guide rod. Both ends of the pressure spring are fixedly connected to the inner side of the positioning plate on both sides. The guide block is fixedly connected to the other side of the positioning plate. The guide block is rotatably connected to the roller.

[0006] Using the above technical solution, the testing mechanism includes a needle bed, a pressure plate, and a probe. The needle bed is provided with several positioning holes, and a probe is detachably connected to the positioning holes. Test holes corresponding to the needle bed are opened on the pressure plate. The needle bed is fixed to the bottom of the pressure plate by bolts. The probe tip passes through the test hole of the pressure plate and protrudes from the surface of the needle bed for contacting the test point of the PCB board.

[0007] Using the above technical solution, the needle bed has a slot, and a bidirectional screw is screwed into the slot. The threads at both ends of the bidirectional screw are opposite. Two drive blocks are screwed into both ends of the bidirectional screw. A knob is fixedly connected to one end of the bidirectional screw. The drive block is fixedly connected to a connecting block. The connecting block is fixedly connected to a wedge block.

[0008] A further improvement of this utility model is that a detection camera is installed in the middle of the needle bed, and a camera lens is installed on the detection camera.

[0009] A further improvement of this utility model is that a rubber pad is laid at the bottom of the base.

[0010] A further improvement of this utility model is that: the middle part of the pressure plate is hinged to one end of the handle by a pin, one end of the handle is screwed to the movable page of the hinge, and the other end is a non-slip grip. The base is provided with multiple connecting rods, and the pressure plate and the needle bed move up and down along the connecting rods.

[0011] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows: 1. This utility model provides a test fixture for testing the continuity of PCB boards. By adjusting the positioning mechanism, the PCB board can be positioned to avoid inaccurate test data caused by PCB board offset. For example, if the PCB board is offset by 1 mm during testing, the testing equipment may misjudge a normal board as an "offset defect" or miss the actual tiny cracks. Positioning can avoid qualified boards being misjudged as scrap due to testing errors. If the PCB is not fixed, it is necessary to frequently adjust the position of the board or manually mark the test points. Positioning can reduce labor costs. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings.

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the main structure of this utility model; Figure 3 This is a top view of the structure of this utility model; Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure along the AA direction; Figure 5 for Figure 3 A schematic diagram of the cross-sectional structure along the BB direction; In the diagram: 1. Base; 2. Connecting column; 3. Detection mechanism; 4. Positioning mechanism; 5. Rubber pad; 6. Handle; 7. Connecting rod; 8. Groove one; 9. Wedge block; 10. Connecting block; 11. Drive block; 12. Knob; 13. Detection camera; 14. Camera lens; 31. Pressure plate; 32. Needle bed; 33. Probe; 41. Bidirectional screw; 42. Positioning plate; 43. Elastic fixing block; 44. Groove two; 45. Guide rod; 46. Slider; 47. Roller; 48. Guide block; 49. Pressure spring. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to embodiments: Example 1 like Figures 1-5 As shown, this utility model provides a test fixture for testing the continuity of PCB boards, including a base 1, a testing mechanism 3, and a positioning mechanism 4. The base 1 is provided with a connecting column 2, which is detachably connected to the testing mechanism 3. The base 1 is detachably connected to the positioning mechanism 4. The positioning mechanism includes a positioning plate 42, an elastic fixing block 43, a slot 44, a guide rod 45, a slider 46, a roller 47, a guide block 48, and a pressure spring 49. Two slots 44 are opened at the bottom of the base 1. The guide rod 45 is fixedly connected to the slot 44. The slider 46 is slidably connected to both sides of the guide rod 45. The slider 46 is fixedly connected to the positioning plate 42. The positioning plate 42 is fixedly connected to the elastic fixing block 43. The pressure spring 49 is sleeved on the guide rod 45. The two ends of the pressure spring 49 are fixedly connected to the inner side of the positioning plate 42 on both sides. The guide block 48 is fixedly connected to the other side of the positioning plate 42. The guide block 48 is rotatably connected to the roller 47.

[0015] In this embodiment, the testing mechanism 3 includes a needle bed 32, a pressure plate 31, and a probe 33. The needle bed 32 is provided with a plurality of positioning holes, and the probe 33 is detachably connected to the positioning holes. The pressure plate 31 has test holes corresponding to the needle bed 32. The needle bed 32 is fixed to the bottom of the pressure plate 31 by bolts. The tip of the probe 33 passes through the test hole of the pressure plate 31 and protrudes from the surface of the needle bed 32 for contacting the test point of the PCB board.

[0016] like Figures 1-5 As shown, in this embodiment, preferably, the connecting column 2 and the detection mechanism 3 are detachably connected to facilitate quick replacement of different models of detection components, adapt to diverse detection needs, and reduce equipment modification costs. The positioning mechanism 4 can adjust its positioning according to product specifications, flexibly adapting to workpieces of different sizes or shapes, and improving the equipment's versatility.

[0017] like Figures 1-5As shown, the needle bed 32 has a slot 8, and a bidirectional screw 41 is screwed into the slot 8. The threads at both ends of the bidirectional screw 41 are opposite. Two drive blocks 11 are screwed into the two ends of the bidirectional screw 41. A knob 12 is fixedly connected to one end of the bidirectional screw 41. The drive block 11 is fixedly connected to the connecting block 10. The connecting block 10 is fixedly connected to the wedge block 9. The PCB board is placed between two positioning plates 42. Pressing down the handle 6 moves the pressure plate 31 and the needle bed 32 downwards. The wedge block 9 moves with the pressure plate. When the wedge block 9 abuts against the roller 47, the roller 47 moves under the pressure of the wedge block. The roller 47 moves the guide block 48. The positioning plate 42 moves with the roller 47 and the guide block 48. The pressure spring 49 deforms under the pressure. The positioning plate 42 moves the elastic fixing block 43 to position the PCB board. When the PCB board is not positioned in the middle, the knob 12 can be adjusted. The threads at both ends of the bidirectional screw 41 are opposite. When the knob 12 is turned to drive the bidirectional screw 41 to rotate, the positioning plates at both ends will move towards the center or separate synchronously to form a symmetrical clamping force. The PCB board is clamped simultaneously on both sides to prevent displacement or deformation caused by unilateral force, ensuring a fixed position during testing and reducing testing errors caused by positioning deviations. The guide rod 45 is fixed in slot 2 44 inside the base 1, providing rigid support and axial positioning for the slider 46. During sliding, the slot 2 44 restricts the radial displacement of the slider 46, ensuring that the positioning plate 42 moves in a straight line and preventing jamming or displacement of the positioning plate 42 due to slider 46 misalignment. The guide rod 45 and the positioning plate 42 are independent components; if worn due to long-term use, they can be replaced separately without disassembling the entire fixture. The bidirectional threaded structure of the slot 1 8 and the bidirectional screw 41 provides significant advantages in positioning accuracy, adjustment flexibility, structural stability, and cost control.

[0018] Example 2 like Figures 1-5 As shown, based on Embodiment 1, this utility model provides a technical solution: Preferably, the base 1 of the fixture is generally made of an aluminum alloy base plate, serving as the basic platform for the entire fixture, providing stable support, and ensuring that the fixture will not shake or deform during testing; the needle bed 32 has a large number of test probes 33, which directly contact the test points on the PCB board to achieve electrical connection, so as to test the circuit of the PCB board, such as detecting short circuits, open circuits, or faulty components. The base 1 is covered with rubber pads 5. When the pressure plate 31 pushes down the probes 33, the rubber pads 5 absorb the mechanical impact force through elastic deformation, preventing the PCB board from directly colliding with the rigid base, which could cause edge breakage or surface scratches. Especially for thin PCBs or boards with precision components on the surface, the buffering effect can significantly reduce the risk of physical damage during testing.

[0019] like Figures 1-5As shown, based on Example 1, a detection camera is installed in the middle of the needle bed, and a camera lens is mounted on the detection camera. The detection camera, installed in the middle of the needle bed, is closer to the PCB board, and with a high-magnification lens, micron-level detection accuracy can be achieved. For the fine structure of micro-components, the lens can capture details such as solder joint morphology and solder distribution, avoiding image blurring caused by distance, and facilitating the detection of problems such as cold solder joints and misalignment. While the needle bed performs electrical function tests on the PCB, the camera can capture real-time images of the contact status between the probes and the PCB pads, achieving dual verification of electrical testing and visual inspection. The detection camera is installed in the empty space in the middle of the needle bed, and lens selection can avoid probe obstruction, ensuring coverage of the entire PCB area. The images captured by the camera are correlated with the needle bed detection data in real time. Through coordinate mapping, the defect location is accurately located. For example, when the needle bed detects that a pad is not powered, the detection camera image can immediately show whether the pad has insufficient solder paste, component misalignment, or other problems, assisting in the analysis of the cause of failure.

[0020] A rubber pad 5 is laid at the bottom of the base 1. The rubber pad 5 provides sufficient cushioning without being too soft and causing instability in the PCB board support. Minor planar errors may exist during the base manufacturing process; the elasticity of the rubber pad 5 fills these gaps, ensuring uniform contact between the bottom surface of the PCB board and the base 1. This prevents bending and deformation of the board due to localized suspension, which could affect testing accuracy. The rubber pad 5 is made of insulating material, isolating the PCB board from direct contact with the metal base 1 and preventing electrostatic discharge from the base 1 from damaging sensitive components on the PCB board. The addition of an antistatic agent to the rubber pad 5 further reduces the risk of static electricity accumulation and helps form a shielding structure, enhancing EMI protection. The elastic contact of the rubber pad 5 can slightly attract the PCB board, reducing positional deviation during manual placement. The friction of the pad helps fix the board, ensuring the alignment accuracy of the test points and probes 33. During testing, the PCB board may undergo slight deformation due to heat generated by electricity. The elasticity of the rubber pad 5 can compensate for this deformation, preventing board warping or fluctuations in the contact pressure of the probe 33 caused by rigid support. Although the rubber pad 5 may seem to be a supporting role in the fixture, it plays a key role in mechanical protection, electrical insulation, and test stability. Its design combines the characteristics of the PCB board, test requirements, and fixture structure. Through optimization of materials, thickness, and laying method, it achieves the dual value of protection and function.

[0021] Example 3 like Figures 1-5As shown, based on Embodiment 1, this utility model provides a technical solution: Preferably, the middle part of the pressure plate 31 is hinged to one end of the handle 6 via a pin. One end of the handle 6 is screwed onto the movable leaf of the hinge, and the other end is a non-slip grip. The base 1 is provided with multiple connecting rods 7, and the pressure plate 31 and the needle bed 32 move up and down along the connecting rods 7. The handle 6 is hinged to the pressure plate 31 via the pin to form a lever system. The operator only needs to apply 2-3 kg of force to make the pressure plate 31 generate 10-15 kg of downward pressure, which is especially suitable for long-term manual testing scenarios and can reduce operator fatigue. The base 1 is provided with multiple connecting rods 7 that cooperate with the guide holes of the pressure plate 31 and the needle bed 32 to form a linear constraint, preventing the pressure plate 31 and the needle bed 32 from shifting. This can prevent the pressure plate 31 from tilting and causing uneven force on the probes 33, ensuring synchronous contact when multiple probes 33 are detected. The connecting rods 7 can be made of stainless steel to avoid poor contact between the probes 33 and the PCB board due to the pressure plate 31 sagging, ensuring the accuracy of continuity testing.

[0022] In this embodiment, the anti-slip grip at the end of the handle 6 ensures a stable grip even when the operator's hands are sweaty, preventing the pressure plate 31 from suddenly pressing down and damaging the PCB board due to slippage. This structure requires no electricity or air supply, and its purely mechanical structure provides stability. Through a "mechanical lever + linear guide" design, the structure balances the convenience of manual operation with cost control, making it particularly suitable for continuity testing in small-to-medium batch production or R&D stages. It represents a cost-effective fixture solution.

[0023] Example 4 like Figures 1-5 As shown, based on Embodiment 1, this utility model provides a technical solution: the positioning plate 42 is fixedly connected to the elastic fixing block 43, which can avoid damage to the PCB board caused by excessive clamping force and provide buffer for clamping the PCB board. The bidirectional screw 41 is fixedly connected to the knob 12. When the knob 12 drives the bidirectional screw 41 to rotate, it is screwed to the positioning plate 42 through the bidirectional screw 41. The threads at both ends of the bidirectional screw 41 are opposite, which drives the drive block 11 to move, causing the two positioning plates 42 to converge or separate towards the center. After the elastic fixing block 43 abuts against the PCB board, it can maintain its position without additional locking device, avoiding displacement due to vibration during the detection process. When the detection is completed and the handle 6 is lifted, the wedge block 9 moves up with the needle bed 32. The wedge block 9 no longer applies pressure to the roller 47, and the pressure spring 49 drives the positioning plate 42 to reset.

[0024] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A test fixture for testing the continuity of PCB boards, comprising: a base (1), a testing mechanism (3), and a positioning mechanism (4), characterized in that: The base (1) is provided with a connecting column (2), which is detachably connected to the detection mechanism (3). The base (1) is detachably connected to the positioning mechanism (4). The positioning mechanism (4) includes a positioning plate (42), an elastic fixing block (43), a guide rod (45), a slider (46), a roller (47), a guide block (48), and a pressure spring (49). The base (1) has two slots (44) at its bottom, and the guide rod (45) is fixedly connected to the slots (44). Inside, the guide rod (45) is slidably connected to the slider (46) on both sides, the slider (46) is fixedly connected to the positioning plate (42), the positioning plate (42) is fixedly connected to the elastic fixing block (43), the pressure spring (49) is sleeved on the guide rod (45), the two ends of the pressure spring (49) are fixedly connected to the inner side of the positioning plate (42) on both sides respectively, the other side of the positioning plate (42) is fixedly connected to the guide block (48), and the guide block (48) is rotatably connected to the roller (47).

2. The experimental fixture for testing the continuity of PCB boards according to claim 1, characterized in that: The testing mechanism (3) includes a needle bed (32), a pressure plate (31), and a probe (33). The needle bed (32) is provided with several positioning holes, and a probe (33) is detachably connected to the positioning holes. The pressure plate (31) has test holes corresponding to the needle bed (32). The needle bed (32) is fixed to the bottom of the pressure plate (31) by bolts. The tip of the probe (33) passes through the test holes and protrudes from the surface of the needle bed (32) to contact the test point of the PCB board.

3. The experimental fixture for testing the continuity of PCB boards according to claim 2, characterized in that: The needle bed (32) has a slot (8) and a bidirectional screw (41) is screwed into the slot (8). Two drive blocks (11) are screwed into the two ends of the bidirectional screw (41). A knob (12) is fixedly connected to one end of the bidirectional screw (41). The drive block (11) is fixedly connected to the connecting block (10). The connecting block (10) is fixedly connected to the wedge block (9).

4. The experimental fixture for testing the continuity of PCB boards according to claim 2, characterized in that: A detection camera (13) is installed on the needle bed (32), and a camera lens (14) is installed on the detection camera (13).

5. The experimental fixture for testing the continuity of PCB boards according to claim 1, characterized in that: The base (1) has a rubber pad (5) laid at the bottom.

6. The experimental fixture for testing the continuity of PCB boards according to claim 2, characterized in that: The middle part of the pressure plate (31) is hinged to one end of the handle (6) by a pin. One end of the handle (6) is screwed onto the movable page of the hinge, and the other end is a non-slip grip. The base (1) is provided with multiple connecting rods (7). The pressure plate (31) and the needle bed (32) move up and down along the connecting rods (7).

Images