PCB circuit board short circuit defect testing device

Abstract

The utility model relates to the field of PCBs, in particular to a PCB short circuit defect testing device. Comprising a bottom plate, supporting rods, bolts, a supporting plate, positioning columns, a cover plate, a mounting plate and the like. The bottom plate is installed on the lower side of a testing area inside the PCB electrical performance testing machine, a plurality of supporting rods are fixed to the bottom plate through bolts, a supporting plate is fixed to the upper sides of the supporting rods on the bottom plate through bolts, a PCB is placed on the supporting plate, testing points are arranged on the PCB, positioning columns are arranged at the four corners of the upper side of the supporting plate, and probes and a plurality of ejector pins are arranged on the upper side of the supporting plate. The probes are connected with a PCB electrical performance testing machine through copper wires, and the probes are in contact with testing points on the PCB. According to the utility model, the resistance and inductance values of the PCB are measured in a four-wire resistance test and inductance test mode, the control threshold values of the resistance and inductance values of good products are screened as standard threshold values, and short circuit defects of different lines in the same network can be accurately intercepted.

Description

Technical Field

[0001] This utility model relates to the field of PCB circuit boards, and in particular to a short-circuit defect testing device for PCB circuit boards. Background Technology

[0002] A PCB, or Printed Circuit Board, is a crucial component of the electronics industry. It supports and connects electronic components by forming point-to-point electrical connections on an insulating substrate. The primary function of a PCB is to provide a predetermined design platform, enabling various electronic components to be electrically connected according to design requirements and to achieve their intended electronic functions.

[0003] When testing for short circuit defects on PCB circuit boards, ordinary 2-wire electrical testers cannot intercept short circuit defects in the same network, and high-precision 4-wire milli-resistance tests also cannot intercept 100% of them, which may lead to defective products entering the market. At the same time, traditional testing mainly relies on AOI visual inspection for short circuit problems in different lines of the same network. This method can only be observed and judged from the surface and is difficult to detect potential short circuit problems comprehensively and accurately, which has significant limitations. Utility Model Content

[0004] To overcome the shortcomings of short circuit testing blind spots in different lines of the same network, this utility model provides a short circuit defect testing device for PCB circuit boards.

[0005] The technical solution is as follows: A PCB circuit board short circuit defect testing device includes a base plate, support rods, bolts, a support plate, positioning posts, a cover plate, a mounting plate, probes, ejector pins, and a PCB electrical performance testing machine. The base plate is installed on the lower side of the testing area inside the PCB electrical performance testing machine. Multiple support rods are fixed to the base plate by bolts. A support plate is fixed to the upper side of the support rods on the base plate by bolts. A PCB board is placed on the support plate, and test points are set on the PCB board. Positioning posts are set at the four corners of the upper side of the support plate. Probes and multiple ejector pins are set on the upper side of the support plate. The probes are connected to the PCB electrical performance testing machine through copper wires and contact the test points on the PCB board. A cylinder is set in the middle of the PCB electrical performance testing machine. The piston of the cylinder is connected to the mounting plate. Multiple support rods are fixed to the lower side of the mounting plate by bolts. A cover plate is fixed to the bottom of the support rods on the lower side of the mounting plate by bolts. Positioning holes adapted to the positioning posts are opened on the lower side of the cover plate.

[0006] Optionally, the upper dimension of the positioning post is adapted to the positioning hole on the lower side of the cover plate, and the lower dimension of the positioning post is larger than the positioning hole.

[0007] Optionally, the ejector pin is located below the PCB board in a position that does not affect the circuit.

[0008] Optionally, the position of the probe on the support plate can be adjusted according to the measurement point position of different PCB boards.

[0009] Optionally, the support rods are evenly distributed above the base plate and below the mounting plate.

[0010] Optionally, it also includes a protective shell, which is provided on the upper side of the base plate and covers the support rod on the upper side of the base plate. A through hole is opened on the rear side of the protective shell for the copper wire connecting the probe and the PCB electrical performance tester to pass through.

[0011] The beneficial effects are as follows: 1. This utility model measures the resistance and inductance values ​​of the PCB board by using a four-wire resistance test + inductance test, and uses the control threshold of the resistance and inductance values ​​of good products as the standard threshold. It can accurately intercept short circuit defects in different lines of the same network, and solve the limitation of traditional testing of short circuits in different lines of the same network that can only rely on AOI visual inspection. It blocks the defects from the testing point and ensures that no defective products are leaked.

[0012] 2. This utility model avoids damage to the PCB board caused by excessive downward movement of the cover plate through the design of the positioning post size; through the design of the ejector pin position, it ensures that the ejector pin is located below the PCB board and does not affect the circuit position, and will not interfere with the circuit when supporting the PCB board, thus ensuring the normal operation of the PCB board circuit and avoiding deviations in test results due to improper ejector pin position.

[0013] 3. This utility model can adjust the position of the probe on the support plate according to the measurement point position of different PCB boards, which can adapt to the testing needs of PCB boards with different measurement point positions, thus improving the applicability and flexibility of the device. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is a three-dimensional structural diagram of the present invention after the protective shell has been removed.

[0016] Figure 3 This is a three-dimensional structural diagram of the support plate, positioning column, and probe of this utility model.

[0017] Figure 4 This utility model Figure 3 Enlarged view of point A in the middle.

[0018] Figure 5 This is a three-dimensional structural diagram of the cover plate of this utility model when it is pressed down.

[0019] Figure 6 This is a three-dimensional structural diagram of the present invention when installed on a PCB electrical performance testing machine.

[0020] The above-mentioned attached drawings include the following reference numerals: 1. base plate, 101. protective shell, 2. support rod, 21. bolt, 3. support plate, 4. positioning post, 5. cover plate, 6. mounting plate, 7. probe, 8. ejector pin, 9. PCB electrical performance tester. Detailed Implementation

[0021] The present invention will be further described below with reference to specific embodiments. It should also be noted that, unless otherwise explicitly specified and limited, terms such as "setting," "installing," "connecting," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0022] PCB circuit board short circuit defect testing device, such as Figures 1-6 As shown, the device includes a base plate 1, support rods 2, bolts 21, a support plate 3, positioning pins 4, a cover plate 5, a mounting plate 6, probes 7, ejector pins 8, and a PCB electrical performance tester 9. The base plate 1 is installed on the lower side of the internal testing area of ​​the PCB electrical performance tester 9. Multiple support rods 2 are fixed to the base plate 1 by bolts 21. A support plate 3 is fixed to the upper side of the support rods 2 on the base plate 1 by bolts 21. A PCB board is placed on the support plate 3, and test points are provided on the PCB board. Positioning pins 4 are provided at the four corners of the upper side of the support plate 3. Probes 7 and multiple ejector pins 8 are provided on the upper side of the support plate 3. Probes 7 are connected to the PCB electrical performance tester 9 through copper wires and contact the test points on the PCB board. A cylinder is provided in the middle of the PCB electrical performance tester 9. The piston of the cylinder is connected to the mounting plate 6. Multiple support rods 2 are fixed to the lower side of the mounting plate 6 by bolts 21. A cover plate 5 is fixed to the bottom of the support rods 2 on the lower side of the mounting plate 6 by bolts 21. Positioning holes that are compatible with the positioning pins 4 are opened on the lower side of the cover plate 5.

[0023] During use, the PCB board is placed on the support plate 3, the ejector pin 8 contacts and supports the PCB board, the probe 7 contacts the test point on the PCB board, the piston of the cylinder of the PCB electrical performance tester 9 extends downward, driving the mounting plate 6 and cover plate 5 to descend, the positioning post 4 on the support plate 3 is embedded in the positioning hole of the cover plate 5, the support plate 3 and cover plate 5 clamp the PCB board to avoid unnecessary displacement during the test. The PCB electrical performance tester 9 measures the resistance and inductance values ​​of the PCB board by four-wire resistance test + inductance test, and uses the control threshold of resistance and inductance values ​​for screening good products as the standard threshold. It can accurately intercept short circuit defects in different lines of the same network, solving the limitation of traditional testing of short circuits in different lines of the same network that can only rely on AOI visual inspection. By blocking the problem from the test, it can guarantee 100% defect-free products.

[0024] The upper part of the positioning post 4 is adapted to the positioning hole on the lower side of the cover plate 5. The lower part of the positioning post 4 is larger than the positioning hole. When the cover plate 5 moves downward under the action of the cylinder, after the positioning post 4 is inserted into the positioning hole, the cover plate 5 cannot continue to move downward excessively due to the limitation of the lower part, thereby avoiding the squeezing damage to the PCB board that may be caused by excessive movement.

[0025] The ejector pin 8 is positioned below the PCB board so as not to affect the circuit. This ensures that the ejector pin 8 will not interfere with the circuit when supporting the PCB board, thus guaranteeing the normal operation of the PCB board circuit and avoiding deviations in test results due to improper positioning of the ejector pin 8.

[0026] The position of probe 7 on support plate 3 can be adjusted according to the measurement point position of different PCB boards, which can adapt to the testing needs of PCB boards with different measurement point positions, thus improving the applicability and flexibility of the device.

[0027] The support rods 2 are evenly distributed above the base plate 1 and below the mounting plate 6. The evenly distributed support rods 2 can ensure that the support force of the base plate 1 on the support plate 3 and the mounting plate 6 on the cover plate 5 is uniform, so that the PCB board is subjected to uniform force during the test and avoids deformation or damage to the PCB board due to uneven force.

[0028] like Figure 1 As shown, it also includes a protective shell 101. The protective shell 101 is provided on the upper side of the base plate 1. The protective shell 101 covers the support rod 2 on the upper side of the base plate 1. The protective shell 101 has a through hole on the rear side. The through hole is used for the copper wire connecting the probe 7 and the PCB electrical performance tester 9 to pass through. The protective shell 101 can play a certain protective role for the copper wire connecting the probe 7 and the PCB electrical performance tester 9.

[0029] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A PCB circuit board short-circuit defect testing device, characterized in that, The test includes a base plate (1), support rods (2), bolts (21), a support plate (3), positioning posts (4), a cover plate (5), a mounting plate (6), probes (7), ejector pins (8), and a PCB electrical performance tester (9). The base plate (1) is installed on the lower side of the test area inside the PCB electrical performance tester (9). Multiple support rods (2) are fixed on the base plate (1) by bolts (21). A support plate (3) is fixed on the upper side of the support rods (2) on the base plate (1) by bolts (21). A PCB board is placed on the support plate (3), and test points are provided on the PCB board. Positioning posts (4) are provided at the four corners of the side. Probes (7) and multiple pins (8) are provided on the upper side of the support plate (3). The probes (7) are connected to the PCB electrical performance tester (9) through copper wires. The probes (7) are in contact with the test points on the PCB board. A cylinder is provided in the middle of the PCB electrical performance tester (9). The piston of the cylinder is connected to the mounting plate (6). Multiple support rods (2) are fixed on the lower side of the mounting plate (6) by bolts (21). The bottom of the support rods (2) on the lower side of the mounting plate (6) is fixed with a cover plate (5) by bolts (21). The lower side of the cover plate (5) has a positioning hole that matches the positioning posts (4).

2. The PCB circuit board short-circuit defect testing device as described in claim 1, characterized in that, The upper dimension of the positioning post (4) is adapted to the positioning hole on the lower side of the cover plate (5), and the lower dimension of the positioning post (4) is larger than the positioning hole.

3. The PCB circuit board short-circuit defect testing device as described in claim 2, characterized in that, The ejector pin (8) is located below the PCB board in a position that does not affect the circuit.

4. The PCB circuit board short-circuit defect testing device as described in claim 3, characterized in that, The position of the probe (7) on the support plate (3) can be adjusted according to the measurement point position of different PCB boards.

5. The PCB circuit board short-circuit defect testing device as described in claim 4, characterized in that, The support rods (2) are evenly distributed above the base plate (1) and below the mounting plate (6).

6. The PCB circuit board short-circuit defect testing device as described in claim 5, characterized in that, It also includes a protective shell (101). The protective shell (101) is provided on the upper side of the base plate (1). The protective shell (101) covers the support rod (2) on the upper side of the base plate (1). A through hole is opened on the rear side of the protective shell (101). The through hole is used for the copper wire connecting the probe (7) and the PCB electrical performance tester (9) to pass through.

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