PCB size detection tool

Abstract

The utility model discloses a PCB size detection tool, and belongs to the field of circuit board detection. Comprising a detection table; the detection assembly is installed on the detection table, the detection assembly comprises a supporting part which is installed on the detection table and used for supporting the PCB, the supporting part comprises a second clamping base installed on the detection table, and a groove used for embedding and positioning one side edge of the PCB is formed in the second clamping base; a limiting part used for keeping the PCB placed in the groove in a vertical state is vertically arranged on the second clamping seat in a penetrating mode, and a contact part used for clamping the other side edge of the PCB is installed on the detection table. According to the PCB size detection tool, rapid positioning of the circuit board is achieved through the groove of the second clamping seat, the operation process is simplified, the limiting part forcibly keeps the circuit board perpendicular, the manual alignment error is eliminated, the contact part and the supporting part are stably clamped, and the data accuracy and the detection efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of circuit board inspection technology, and in particular to a tooling for inspecting the dimensions of PCB circuit boards. Background Technology

[0002] In modern electronics manufacturing, PCBs are key components of various electronic devices, and their dimensional accuracy directly affects the compatibility of components and the overall circuit performance. As electronic products become increasingly miniaturized, integrated, and high-density, the dimensional accuracy requirements for PCBs are becoming more stringent. Therefore, PCB dimensional inspection has become a crucial step in ensuring product quality.

[0003] For example, utility model patent CN221404131 U discloses a circuit board size detection device, which includes a base, a main rod, a thickness measuring component, and a length measuring component. This allows for the clamping of circuit boards of different sizes by pushing two U-shaped sliding frames. By reading the scale lines on the second and first measuring rulers, the length and width of the circuit board can be measured respectively. When the angle of the circuit board needs to be adjusted, turning the crank handle will rotate the plate, thus facilitating the adjustment of the circuit board's position and making it convenient to detect its size.

[0004] However, when the aforementioned testing device clamps and fixes the PCB circuit board, the circuit board must first be placed between two sets of resisting blocks. Then, two U-shaped sliding frame components are manually moved to slide the two sets of resisting blocks until they contact the surface of the circuit board. Subsequently, two bolts need to be tightened on each U-shaped sliding frame to complete the fixation. The entire process requires multiple bolt operations in steps, which is quite cumbersome. Moreover, when batch testing circuit boards of different sizes, frequent bolt tightening and loosening operations will reduce testing efficiency. At the same time, since the clamping process relies on manual alignment, it is difficult to ensure that the measurement reference plane of the circuit board is perpendicular to the first measuring ruler. Angle deviations can easily lead to errors in the thickness or length and width measurements, thus affecting the product's qualification judgment. Therefore, it is necessary to design a PCB circuit board size testing fixture.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Utility Model Content

[0006] This utility model provides a PCB circuit board size inspection fixture to solve the problems of needing to tighten multiple bolts in steps to clamp the circuit board, which is complicated and inefficient; manual alignment is difficult to ensure perpendicularity, which is prone to angular deviation and measurement errors, affecting the judgment.

[0007] This utility model embodiment adopts the following technical solution: a PCB circuit board size inspection fixture. It mainly includes an inspection table; an inspection component mounted on the inspection table, the inspection component including a support portion mounted on the inspection table for supporting the PCB circuit board, the support portion including a clamping seat two mounted on the inspection table, the clamping seat two having a groove for positioning one side of the PCB circuit board, the clamping seat two having a vertically penetrating limiting portion for maintaining the vertical state of the PCB circuit board placed in the groove, and a contact portion for clamping the other side of the PCB circuit board mounted on the inspection table.

[0008] Furthermore, the limiting part includes a T-shaped seat that is installed through the clamping seat two. A fixing part is installed on the T-shaped seat near both ends. A bidirectional lead screw two is mounted between the two sets of fixing parts. The bidirectional lead screw two has two sets of spiral grooves with opposite directions of rotation. A movable seat is threaded onto the two sets of spiral grooves on the bidirectional lead screw two. A clamping block that contacts and clamps the PCB circuit board is installed on the movable seat. A silicone pad is embedded at the contact position between the clamping block and the PCB circuit board.

[0009] Furthermore, the contact part includes a guide rod mounted on the testing table. A scale is embedded on both sides of the guide rod. The zero mark of the scale is aligned with the bottom surface of the inner wall of the groove of the second clamping seat to form a measurement reference. A sliding sleeve is movably sleeved on the guide rod. A clamping seat is mounted on the side of the sliding sleeve. The clamping seat and the second clamping seat are arranged in a mirror symmetrical manner. The clamping seat and the second clamping seat have similar structures.

[0010] Furthermore, a pressure sensor is embedded in the inner wall of a groove in the clamping seat.

[0011] Furthermore, both sets of clamping blocks are vertically perforated with limiting strips, which are parallel to the grooves. The end of the limiting strip extending out of the clamping seat has a mounting part. The mounting part on the left is defined as mounting part one, and the mounting part on the right is defined as mounting part two. A laser displacement sensor is mounted on mounting part one, and the laser head of the laser displacement sensor is flush with the side of the clamping block closest to the PCB circuit board. A receiver is mounted on mounting part two, and the photosensitive surface of the receiver is aligned with the inner working surface of the clamping block.

[0012] Furthermore, the placement assembly includes a support frame, a movable component mounted on the support frame, the movable component including a mounting bracket mounted on the support frame, a drive unit disposed between the mounting bracket and the support frame, the drive unit including a lead screw connected between the mounting bracket and the support frame via a bearing;

[0013] A drive component is installed on the support frame and at one end of the lead screw. The drive component is keyed to one end of the lead screw. A slide plate is threaded onto the lead screw. Two sets of slide rails are installed on the mounting frame. The slide plate slides on both sets of slide rails simultaneously. The slide plate is connected to the sliding sleeve.

[0014] Furthermore, a PLC control system is installed on the support frame.

[0015] The above-mentioned technical solutions adopted in the embodiments of this utility model can achieve the following beneficial effects:

[0016] This PCB circuit board dimensional inspection fixture features a groove in the clamping seat of the support unit for side-mounting and positioning of the circuit board. This replaces the complex operation of traditional multi-bolt step-by-step fixing, avoiding the tedious process of manually moving the resisting blocks and tightening multiple bolts, thus simplifying the clamping process. Simultaneously, the vertically penetrating limiting part on the clamping seat of the support unit mechanically maintains the verticality of the circuit board when its side is placed in the groove. This changes the traditional fixture's reliance on manual alignment, preventing the measurement reference surface from being non-perpendicular due to manual operation. It effectively reduces thickness or length / width measurement errors caused by angular deviations, improving the stability and reliability of the inspection reference. The contact part, in conjunction with the support unit, achieves stable clamping of both sides of the circuit board, ensuring the circuit board's position is fixed during measurement and further guaranteeing the accuracy of the inspection data. Attached Figure Description

[0017] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0018] In the attached diagram:

[0019] Figure 1 This is an overall schematic diagram of the PCB circuit board size inspection fixture in this application;

[0020] Figure 2 for Figure 1 A schematic diagram of the structure in its default state;

[0021] Figure 3 for Figure 2 A schematic diagram of the bottom structure;

[0022] Figure 4 for Figure 2 A partial structural diagram;

[0023] Figure 5 for Figure 4 Enlarged view of point A;

[0024] Figure label:

[0025] 1. Placement component; 11. Support frame; 12. PLC control system; 14. Detection table; 2. Moving component; 21. Mounting frame; 22. Drive unit; 23. Slide rail; 24. Slide plate; 25. Lead screw one; 26. Drive component; 3. Detection component; 31. Guide rod; 32. Scale; 33. Sliding sleeve; 34. Clamping seat one; 35. Clamping seat two; 36. Groove; 37. T-shaped seat; 38. Fixing part; 39. Bidirectional lead screw two; 310. Moving seat; 311. Clamping block; 312. Limiting strip; 313. Laser displacement sensor; 314. Receiver. Detailed Implementation

[0026] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0027] The technical solutions provided by the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0028] Reference Figures 1-3 As shown, this utility model embodiment provides a PCB circuit board size inspection fixture, including a placement component 1. The placement component 1 includes a support frame 11, and an inspection table 14 is fixedly installed on the support frame 11. An inspection component 3 is installed on the inspection table 14. The inspection component 3 includes a support part installed on the inspection table 14. The support part includes a clamping seat 35 fixedly installed on the inspection table 14. The clamping seat 35 is used to support the PCB circuit board.

[0029] The clamping base 35 has a groove 36 for positioning one side of the PCB circuit board, and a limiting part is vertically provided through the clamping base 35. At the same time, a through groove (not shown in the figure) adapted to the limiting part is provided on the clamping base 35. The limiting part is used to keep one side of the PCB circuit board in a vertical state when it is placed in the groove 36.

[0030] The limiting part includes a T-shaped seat 37 that is fixedly installed on the clamping seat 35. Fixing parts 38 are fixedly installed on the T-shaped seat 37 near both ends. A bidirectional lead screw 39 is mounted between the two sets of fixing parts 38. The bidirectional lead screw 39 has two sets of spiral grooves with opposite directions of rotation. A turntable (not shown in the figure) is fixedly installed at one end of the bidirectional lead screw 39. The turntable facilitates the rotation of the bidirectional lead screw 39. Meanwhile, a movable seat 310 is threadedly connected to the two sets of spiral grooves on the bidirectional lead screw 39. A clamping block 311 that contacts and clamps the PCB circuit board is fixedly installed on the movable seat 310. A silicone pad (not shown in the figure) is embedded at the contact position between the clamping block 311 and the PCB circuit board. The silicone pad buffers the clamping force to avoid damage to the board surface and enhances the friction to prevent the circuit board from slipping.

[0031] In the initial state, the operator first inserts one side of the PCB circuit board into the groove 36, ensuring that the bottom surface of the PCB circuit board is completely in contact with the bottom surface of the groove 36, forming a stable horizontal support reference. Then, the operator holds and rotates the turntable, driving the two-way lead screw 39 to rotate synchronously. Under the action of the threaded transmission, the two sets of moving seats 310 begin to move synchronously towards each other along the axial direction, causing the two sets of clamping blocks 311 fixed to the moving seats 310 to gradually approach each other from both sides of the circuit board. As the turntable continues to rotate, the embedded silicone pads on the clamping blocks 311 first gently contact the side of the circuit board until the side of the circuit board is completely in contact with the vertical sidewall of the groove 36, so that the side of the PCB circuit board remains perpendicular to the bottom surface of the groove 36.

[0032] To measure the length of a PCB circuit board, such as Figures 2-5 As shown, a contact part is installed on the testing table 14. The contact part includes a guide rod 31 fixedly installed on the testing table 14, and a scale 32 is embedded on both sides of the guide rod 31. The zero mark of the scale 32 is aligned with the bottom surface of the inner wall of the groove 36 of the clamping seat 2 35 to form a measurement reference. Meanwhile, a sliding sleeve 33 is movably sleeved on the guide rod 31, and a clamping seat 1 34 is fixedly installed on the side of the sliding sleeve 33. The clamping seat 1 34 and the clamping seat 2 35 are arranged in a mirror symmetrical manner, and the clamping seat 1 34 and the clamping seat 2 35 have similar structures.

[0033] Furthermore, a pressure sensor embedded in the inner wall of the groove 36 of the clamping seat 34 monitors the contact force in real time. When the pressure value reaches a preset threshold, it indicates that the clamping seat 34 is completely in contact with the side of the circuit board. At this time, the length of the circuit board can be accurately obtained by directly reading the scale value of the ruler 32 corresponding to the bottom surface of the sliding sleeve 33. If the width needs to be measured, simply rotate the circuit board 90°, reinstall it, align the width side with the groove 36, and complete the measurement using the same measurement principle.

[0034] In this application, to improve reading accuracy, a magnifying glass assembly (not shown in the figure) is provided on the bottom surface of the sliding sleeve 33, which can magnify the scale lines and effectively reduce human reading errors.

[0035] To drive the sliding sleeve 33 to move, so that it automatically approaches the side of the PCB circuit board, such as... Figures 3-4 As shown, a movable component 2 is installed on the support frame 11. The movable component 2 includes a mounting frame 21 fixedly installed on the support frame 11, and a drive unit 22 is provided between the mounting frame 21 and the support frame 11. The drive unit 22 includes a lead screw 25 connected between the mounting frame 21 and the support frame 11 by a bearing. A drive member 26 is fixedly installed on the support frame 11 and at one end of the lead screw 25. The drive member 26 is keyed to one end of the lead screw 25, and a slide plate 24 is threadedly connected to the lead screw 25. Two sets of slide rails 23 are fixedly installed on the side of the mounting frame 21 near the guide rod 31. The slide plate 24 slides on both sets of slide rails 23 and is connected to the sliding sleeve 33.

[0036] When it is necessary to measure the length of the PCB circuit board, the control system sends a command to the drive unit 26, and the lead screw 25 rotates clockwise, driving the slide plate 24 to move along the slide rail 23 towards the clamping seat 35 until the pressure sensor on the inner wall of the groove 36 of the clamping seat 34 reports that the contact force has reached the preset value, and the drive unit 26 stops starting.

[0037] To measure the thickness of a PCB circuit board, such as Figures 4-5 As shown, a limiting strip 312 is vertically inserted through both sets of clamping blocks 311. The limiting strip 312 is parallel to the groove 36, and one end of the limiting strip 312 extending out of the clamping seat 35 has a mounting portion (not shown in the figure). Figure 5 Based on this, the mounting part on the left is defined as mounting part one, and the mounting part on the right is defined as mounting part two. A laser displacement sensor 313 is mounted on mounting part one. The laser head of the laser displacement sensor 313 is flush with the side of the clamping block 311 that is close to the PCB circuit board. A receiver 314 is mounted on mounting part two. The photosensitive surface of the receiver 314 is also aligned with the inner working surface of the clamping block 311.

[0038] After the clamping block 311 clamps the PCB circuit board via the bidirectional lead screw 39, the laser beam emitted by the laser displacement sensor 313 is received in real time by the receiver 314. The system calculates the actual thickness of the circuit board by calculating the time difference between the laser beam emission and reception, combined with an air refractive index compensation algorithm.

[0039] Meanwhile, a PLC control system 12 is installed on the support frame 11, which is used to control the operation of the above-mentioned equipment.

[0040] Working Principle: During testing, the operator first inserts one side of the circuit board into the groove 36 of the clamping seat 35. The bottom surface of the groove 36 is completely flush with the bottom surface of the circuit board, forming a horizontal support reference. The hand-held turntable drives the bidirectional lead screw 39 to rotate, using its two reverse spiral grooves to drive the two sets of moving seats 310 to move synchronously in opposite directions, so that the clamping block 311 flexibly clamps the circuit board from both sides through the embedded silicone pad. During this process, the contact force of the clamping block 311 is evenly transmitted through the silicone pad, avoiding scratches on the board surface, while the friction force causes the side of the circuit board to fit tightly against the vertical sidewall of the groove 36. The T-shaped seat 37 of the limiting part and the through groove of the clamping seat 35 form a rigid vertical constraint, forcing the side of the circuit board to remain absolutely perpendicular to the bottom surface of the groove 36, eliminating the angular deviation caused by manual alignment, and establishing a unified geometric reference for subsequent measurements.

[0041] The drive unit 26 (servo motor) of the moving component 2 drives the lead screw 25 to rotate, causing the slide plate 24 to move along the slide rail 23 and push the sliding sleeve 33 until the pressure sensor on the inner wall of the groove 36 of the clamping seat 34 feedbacks the preset contact force, indicating that it is completely in contact with the side of the circuit board. At this time, the scale value of the scale 32 corresponding to the bottom surface of the sliding sleeve 33 reflects the length of the circuit board. To measure the width, simply rotate the circuit board 90° so that the width side is aligned with the groove 36 and repeat the same process. The magnifying glass assembly on the bottom surface of the sliding sleeve 33 further magnifies the scale lines, reducing human reading errors. After the circuit board is clamped, the thickness of the PCB circuit board is obtained through the cooperation of the laser displacement sensor 313 and the receiver 314.

[0042] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A PCB circuit board size inspection fixture, characterized in that: include Testing station (14); The detection component (3) is installed on the detection table (14). The detection component (3) includes a support part installed on the detection table (14) and used to support the PCB circuit board. The support part includes a clamping seat two (35) installed on the detection table (14). The clamping seat two (35) has a groove (36) for positioning one side of the PCB circuit board. The clamping seat two (35) has a limiting part that is vertically provided to keep the PCB circuit board placed in the groove (36) in a vertical state. The detection table (14) is equipped with a contact part for clamping the other side of the PCB circuit board.

2. The PCB circuit board size inspection fixture according to claim 1, characterized in that: The limiting part includes a T-shaped seat (37) that is installed through the clamping seat (35). A fixing part (38) is installed on the T-shaped seat (37) near both ends. A double-acting screw (39) is mounted between the two sets of fixing parts (38) and a double-acting screw (39) is mounted on the bearing. The double-acting screw (39) has two sets of spiral grooves with opposite directions of rotation. A movable seat (310) is threaded onto the two sets of spiral grooves on the double-acting screw (39). A clamping block (311) that contacts and clamps the PCB circuit board is installed on the movable seat (310). A silicone pad is embedded at the contact position between the clamping block (311) and the PCB circuit board.

3. The PCB circuit board size inspection fixture according to claim 2, characterized in that: The contact part includes a guide rod (31) mounted on the testing table (14). A scale (32) is embedded on both sides of the guide rod (31). The zero mark of the scale (32) is aligned with the bottom surface of the inner wall of the groove (36) of the clamping seat (35) to form a measurement reference. A sliding sleeve (33) is movably sleeved on the guide rod (31). A clamping seat (34) is mounted on the side of the sliding sleeve (33). The clamping seat (34) and the clamping seat (35) are arranged in a mirror symmetrical manner. The clamping seat (34) and the clamping seat (35) have similar structures.

4. The PCB circuit board size inspection fixture according to claim 3, characterized in that: The pressure sensor is embedded in the inner wall of the groove (36) of the clamping seat (34).

5. The PCB circuit board size inspection fixture according to claim 2, characterized in that: Both sets of clamping blocks (311) are vertically connected by limiting strips (312), which are parallel to the grooves (36). The limiting strips (312) extend out of one end of the clamping seat (35) and have a mounting part. The mounting part on the left is defined as mounting part one, and the mounting part on the right is defined as mounting part two. A laser displacement sensor (313) is mounted on mounting part one. The laser head of the laser displacement sensor (313) is flush with the side of the clamping block (311) that is close to the PCB circuit board. A receiver (314) is mounted on mounting part two. The photosensitive surface of the receiver (314) is aligned with the inner working surface of the clamping block (311).

6. The PCB circuit board size inspection fixture according to claim 3, characterized in that: The device includes a placement assembly (1), which includes a support frame (11). A moving assembly (2) is mounted on the support frame (11). The moving assembly (2) includes a mounting bracket (21) mounted on the support frame (11). A driving unit (22) is provided between the mounting bracket (21) and the support frame (11). The driving unit (22) includes a lead screw (25) connected between the mounting bracket (21) and the support frame (11) via a bearing. A drive unit (26) is installed on the support frame (11) and at one end of the lead screw (25). The drive unit (26) is keyed to one end of the lead screw (25). A slide plate (24) is threaded onto the lead screw (25). Two sets of slide rails (23) are installed on the mounting frame (21). The slide plate (24) slides on both sets of slide rails (23) at the same time. The slide plate (24) is connected to the sliding sleeve (33).

7. The PCB circuit board size inspection fixture according to claim 6, characterized in that: A PLC control system (12) is installed on the support frame (11).

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