An auxiliary jig for a flying probe tester

Abstract

This utility model discloses an auxiliary fixture for a flying probe tester, applicable to the field of fixtures. It includes a mounting frame with upper and lower guide rails at its upper and lower ends, respectively. The upper guide rail connects to a clamping beam, and the lower guide rail connects to a lower support. The clamping beam has multiple clamping units, including hollow columns, insert rods with clamping covers, and electromagnets. Edge clamping is achieved by the electromagnets and springs driving the insert rods to rise and fall. The lower support has a support unit, including a hollow telescopic column, a movable end with a support cover, and an electromagnet. The electromagnet drives the support cover to rise and fall to support the PCB. During operation, the support unit lifts the PCB, the clamping beam moves the clamping units closer, and the electromagnet drives the clamping cover to press down and clamp the PCB edge with the hollow column. The support unit then resets. Through the coordinated action of the clamping and support units, precise positioning and edge protection of the circuit board are ensured during testing, achieving automated and stable clamping and protection of the PCB circuit board.

Description

Technical Field

[0001] This utility model relates to the field of fixtures, and in particular to an auxiliary fixture for a flying probe tester. Background Technology

[0002] The auxiliary fixture for flying probe testing machines is a key auxiliary device for ensuring the stability and efficiency of testing precision electronic components. This fixture adopts a modular design, using high-precision positioning pins and a quick-locking structure to achieve rapid clamping of test components of different specifications, such as PCB boards and flexible circuit boards. The repeatability is ±0.01mm, effectively avoiding displacement errors during testing. The fixture surface is made of insulating and anti-static material, with built-in elastic buffer components that can adapt to workpieces of different thicknesses and prevent board deformation caused by excessive probe bed pressure. The integrated vacuum adsorption system and side limiting mechanism work together to ensure the stability of ultra-thin and irregularly shaped workpieces during high-speed testing.

[0003] Chinese patent CN204882625U discloses a planar flying probe tester fixture. By using a planar flying probe tester fixture with a symmetrical opening and closing mechanism, the center plane of PCBs of different thicknesses is kept consistent, thereby ensuring that the distance between the test probes on both sides of the planar flying probe tester and each side of the PCB is consistent, and achieving uniform clamping force.

[0004] Chinese patent CN203658399U discloses a vertical flying probe tester fixture for holding PCB boards, including a fixed plate, a movable plate, a first clamping strip, a second clamping strip, a guide assembly, an auxiliary spring, a connecting rod assembly, a limiting assembly, and a drive assembly; when the item is no longer needed to be held, the drive assembly only needs to move in the opposite direction to remove the item, making operation convenient.

[0005] In existing flying probe tester fixtures, the clamping force is not uniform enough, which can easily lead to unreliable clamping and makes it difficult to clamp PCBs of different shapes, resulting in poor adaptability. Utility Model Content

[0006] The core of this invention lies in solving the problem of uneven clamping force in existing clamps, which easily leads to unreliable clamping, through the synergistic effect of the clamping unit and the support unit.

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] An auxiliary fixture for a flying probe testing machine includes a mounting frame. A pair of upper guide rails and a pair of lower guide rails are connected to the upper and lower ends of the mounting frame, respectively. A pair of clamping beams are connected between the pair of upper guide rails. The movable ends of the pair of upper guide rails are fixedly connected to the two clamping beams, respectively. A lower bracket is connected between the pair of lower guide rails, and the movable ends of the pair of lower guide rails are fixedly connected to the two lower brackets, respectively. Multiple evenly distributed clamping units are provided on the clamping beams. Each clamping unit includes a hollow column, the lower end of which is fixedly connected to a limiting block. A limiting groove matching the limiting block is provided on the clamping beam. A first compression spring is connected between the sidewall of the limiting groove and the limiting block. The top of the hollow column has a slot and a rod is slidably inserted therein. A second compression spring is connected between the rod and the bottom of the slot. A clamping cap is fixedly connected to the top of the rod. A first electromagnet is embedded in the hollow column. The support unit includes a hollow telescopic column fixedly connected to the lower bracket. A cover is fixedly connected to the top of the movable end of the hollow telescopic column. A second electromagnet is connected inside the fixed end of the hollow telescopic column. Permanent magnets are embedded in both the insert rod and the cover. A return spring is connected between the second electromagnet and the cover.

[0009] Furthermore, when the clamping unit is in its initial position, it is close to the opposite ends of a pair of clamping beams, and a first compression spring is installed on the side of the clamping unit away from the opposite ends of the pair of clamping beams.

[0010] Furthermore, when the movable end of the hollow telescopic column rises to its maximum displacement, the hollow column and the upper surface of the cover are on the same horizontal plane.

[0011] Furthermore, the movable end of the upper guide rail includes a slide table, one end of the clamping beam is matched with the slide table on one upper guide rail, and the other end is provided with a slider that is slidably connected to another upper guide rail. Both ends of the clamping beam are threaded with adjusting bolts, and the two adjusting bolts are rotatably connected to the slider and the slide table respectively.

[0012] Furthermore, a silicone pad layer is laid on the top of the cover and the bottom surface of the clamping cover.

[0013] Furthermore, the hollow column has tapered ends, and the maximum width of the hollow column is consistent with the outer diameter of the clamping cap.

[0014] Optionally, pressure sensors are connected to multiple covers, and a controller is installed on the lower bracket. The pressure sensors and second electromagnets at each support unit are grouped together and electrically connected to the controller.

[0015] Compared with existing technologies, the advantages of this utility model are: (1) This solution ensures the precise positioning and edge protection of the circuit board during the testing process through the coordinated action of the clamping unit and the support unit, and realizes the automated and stable clamping and protection of the PCB circuit board.

[0016] (2) It achieves uniform multi-point support for PCB circuit boards, effectively avoids the risk of deformation caused by local stress concentration, improves test accuracy and circuit board protection effect, and can significantly enhance the adaptability and reliability of the fixture, especially when dealing with large-size or thin PCBs. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present utility model; Figure 2 This is a perspective view of the PCB board clamping process according to the present invention. Figure 3 This is a side view of the PCB board being clamped using this utility model; Figure 4 This is a front sectional view of the clamping unit of this utility model; Figure 5 for Figure 4 Schematic diagram of the structure at point A; Figure 6 This is a cross-sectional view of the support unit of this utility model; Figure 7 for Figure 6 Schematic diagram of the structure at point B; Figure 8 This is a side sectional view of the clamping unit of this utility model; Figure 9 for Figure 8 Schematic diagram of the structure at point C; Explanation of the labels in the diagram: 1. Mounting frame; 2. Upper guide rail; 3. Lower guide rail; 4. Clamping beam; 5. Clamping unit; 51. Hollow column; 52. Limiting block; 53. Insert rod; 54. Clamping cover; 6. Lower bracket; 7. Support unit; 71. Hollow telescopic column; 72. Support cover. Detailed Implementation

[0018] The technical solution will now be clearly and completely described with reference to the accompanying drawings of the embodiments of this utility model.

[0019] First implementation method: Please see Figures 1-9An auxiliary fixture for a flying probe testing machine includes a mounting frame 1. A pair of upper guide rails 2 and a pair of lower guide rails 3 are connected to the upper and lower ends of the mounting frame 1, respectively. A pair of clamping beams 4 are connected between the pair of upper guide rails 2. The movable ends of the pair of upper guide rails 2 are fixedly connected to the two clamping beams 4, respectively. A lower bracket 6 is connected between the pair of lower guide rails 3, and the movable ends of the pair of lower guide rails 3 are fixedly connected to the two lower brackets 6, respectively. Multiple evenly distributed clamping units 5 are provided on the clamping beams 4. Each clamping unit 5 includes a hollow column 51. A limiting block 52 is fixedly connected to the lower end of the hollow column 51. A limiting groove matching the limiting block 52 is opened on the clamping beams 4. A first compression spring is connected between the side wall of the limiting groove and the limiting block 52. The top of the hollow column 51 has a slot and a rod 53 is slidably inserted therein. A second compression spring is connected between the rod 53 and the bottom of the slot. A clamping cover 54 is fixedly connected to the top of the rod 53. A first electromagnet is embedded in the hollow column 51. The support unit 7 includes a hollow telescopic column 71 fixedly connected to the lower bracket 6. A cover 72 is fixedly connected to the top of the movable end of the hollow telescopic column 71. A second electromagnet is connected inside the fixed end of the hollow telescopic column 71. Permanent magnets are embedded in both the insert rod 53 and the cover 72. A return spring is connected between the second electromagnet and the cover 72.

[0020] When the clamping unit 5 is in its initial position, it is close to the opposite ends of a pair of clamping beams 4, and a first compression spring is installed on the side of the clamping unit 5 away from the opposite ends of the pair of clamping beams 4.

[0021] When the movable end of the hollow telescopic column 71 rises to its maximum displacement, the upper surface of the hollow column 51 and the cover 72 are on the same horizontal plane.

[0022] The movable end of the upper guide rail 2 includes a slide table. One end of the clamping beam 4 is matched with the slide table on one upper guide rail 2, and the other end is provided with a slider that is slidably connected to another upper guide rail 2. Both ends of the clamping beam 4 are threaded with adjusting bolts, and the two adjusting bolts are rotatably connected to the slider and the slide table respectively.

[0023] The top of the cover 72 and the lower surface of the clamping cover 54 are both covered with silicone pads.

[0024] The hollow column 51 has tapered ends, and the maximum width of the hollow column 51 is consistent with the outer diameter of the clamping cover 54.

[0025] When this solution is in operation: A1. First, place the PCB circuit board to be tested on a pair of lower brackets 6 and support it through multiple support units 7. Then drive the pair of lower brackets 6 to move between a pair of clamping beams 4. A2, then the second electromagnet is activated. The magnetic force generated by the electromagnet repels the permanent magnet inside the cover 72, overcoming the spring force of the return spring, driving the movable end of the hollow telescopic column 71 to rise, and moving the cover 72 to the maximum displacement position, so that the PCB circuit board is lifted to the predetermined height, and the PCB circuit board is located on the upper side of the hollow column 51. A3, at this time, drive a pair of clamping beams 4 to move closer to each other, so that the plug rod 53 fits against the edge of the PCB circuit. At this time, the edge of the PCB circuit is directly above the hollow column 51. Then, activate the first electromagnet in the clamping unit 5. The magnetic force generated by the electromagnet attracts the permanent magnet in the plug rod 53, driving the plug rod 53 to slide down along the slot of the hollow column 51, causing the clamping cover 54 to press down. At the same time, the second electromagnet closes, and the support cover 72 is reset under the action of the reset spring, causing the PCB circuit board to descend. When the clamping cover 54 is pressed down to contact the PCB circuit board, the lower surface of the clamping cover 54 and the upper surface of the hollow column 51 clamp together and protect the edge of the PCB circuit board. A4, and then the flying probe tester probes can test the PCB circuit board that is firmly clamped; A5. After the test is completed, the first electromagnet is turned off, the plug rod 53 is reset under the action of the second compression spring, and then the pair of clamping beams 4 are driven to move away from each other. The tested PCB circuit board can then fall on the pair of lower brackets 6. Then, the pair of lower brackets 6 are driven to move to transfer the tested PCB circuit board away. This first embodiment achieves automated and stable clamping and protection of PCB circuit boards. Through the coordinated action of clamping unit 5 and support unit 7, it ensures accurate positioning and edge protection of the circuit board during testing. The silicone pad design of clamping cover 54 and support cover 72 effectively buffers clamping pressure and avoids scratching the surface of the circuit board. At the same time, the adjusting bolt structure of upper guide rail 2 and lower guide rail 3 allows for flexible adjustment of clamping position to adapt to PCB circuit boards of different sizes, significantly improving the testing efficiency and reliability of the flying probe tester. This embodiment also utilizes intelligent control of electromagnets and springs to achieve automatic adjustment of clamping force, reduce manual intervention, reduce operational complexity, thereby saving time and reducing the risk of product damage in batch testing.

[0026] Second implementation method: Please see Figures 6-7 The difference between this implementation method and the first implementation method is that: Pressure sensors are connected to multiple covers 72, and a controller is installed on the lower bracket 6. The pressure sensors and second electromagnets at each support unit 7 are grouped together and electrically connected to the controller.

[0027] In this specific implementation, the support unit 7 supports the PCB circuit board that is clamped together by the clamping cover 54 and the hollow column 51. After step A3, the second electromagnet is turned on again and its power is adjusted to raise the cover 72. The value of the pressure sensor at the cover 72 is monitored in real time. When the pressure sensor value reaches the set value, the working power of the second electromagnet is maintained. In this way, multiple support units 7 used to support the PCB circuit board support it with the same supporting force, avoiding excessive local pressure and deformation.

[0028] This implementation provides uniform multi-point support for the PCB circuit board, effectively avoiding the risk of deformation caused by local stress concentration, improving testing accuracy and circuit board protection, and significantly enhancing the adaptability and reliability of the fixture, especially when dealing with large or thin PCBs.

[0029] The above description is merely a preferred embodiment of this utility model; it encompasses all the protection scope of this utility model. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be covered within the protection scope of this utility model.

Claims

1. An auxiliary fixture for a flying probe testing machine, comprising a mounting frame (1), wherein a pair of upper guide rails (2) and a pair of lower guide rails (3) are respectively connected to the upper and lower ends of the mounting frame (1), characterized in that: A pair of clamping beams (4) are connected between a pair of upper guide rails (2), and the movable ends of the pair of upper guide rails (2) are fixedly connected to the two clamping beams (4) respectively. A pair of lower guide rails (3) are connected between a pair of lower brackets (6), and the movable ends of the pair of lower guide rails (3) are fixedly connected to the two lower brackets (6) respectively. A plurality of evenly distributed clamping units (5) are provided on the clamping beams (4). The clamping unit (5) includes a hollow column (51). The lower end of the hollow column (51) is fixedly connected to a limiting block (52). A limiting groove matching the limiting block (52) is opened on the clamping beams (4). A first compression spring is connected between the side wall of the limiting groove and the limiting block (52). The top of the hollow column (51) has a slot and a rod (53) is slidably inserted therein. A second compression spring is connected between the rod (53) and the bottom of the slot. A clamping cover (54) is fixedly connected to the top of the rod (53). A first electromagnet is embedded in the hollow column (51). It also includes a support unit (7), which includes a hollow telescopic column (71) fixedly connected to the lower bracket (6). A cover (72) is fixedly connected to the top of the movable end of the hollow telescopic column (71). A second electromagnet is connected inside the fixed end of the hollow telescopic column (71). Permanent magnets are embedded in both the insert rod (53) and the cover (72). A reset spring is connected between the second electromagnet and the cover (72).

2. The auxiliary fixture for a flying probe testing machine according to claim 1, characterized in that: When the clamping unit (5) is in its initial position, it is close to the opposite ends of a pair of clamping beams (4), and the first compression spring is installed on the side of the clamping unit (5) away from the opposite ends of the pair of clamping beams (4).

3. The auxiliary fixture for a flying probe testing machine according to claim 1, characterized in that: When the movable end of the hollow telescopic column (71) rises to its maximum displacement, the upper surface of the hollow column (51) and the cover (72) are on the same horizontal plane.

4. The auxiliary fixture for a flying probe testing machine according to claim 1, characterized in that: The movable end of the upper guide rail (2) includes a slide table. One end of the clamping beam (4) is matched with the slide table on one upper guide rail (2), and the other end is provided with a slider that is slidably connected to another upper guide rail (2). Both ends of the clamping beam (4) are threaded with adjusting bolts, and the two adjusting bolts are rotatably connected to the slider and the slide table respectively.

5. The auxiliary fixture for a flying probe testing machine according to claim 1, characterized in that: The top of the cover (72) and the bottom surface of the clamping cover (54) are both covered with a silicone pad layer.

6. The auxiliary fixture for a flying probe testing machine according to claim 1, characterized in that: The hollow column (51) has tapered ends, and the maximum width of the hollow column (51) is consistent with the outer diameter of the clamping cover (54).

7. The auxiliary fixture for a flying probe testing machine according to claim 1, characterized in that: Pressure sensors are connected to multiple of the brackets (72), and a controller is installed on the lower bracket (6). The pressure sensors and second electromagnets at each of the support units (7) are grouped together and electrically connected to the controller.

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