PCB electrical performance testing device

Abstract

A PCB electrical performance testing device comprises a base assembly, a fuzz button assembly and a tail end throwing line, the base assembly comprises an upper base, a lower base and a stud, the upper base is fixed to the lower base through the stud, an installation table is arranged on the inner side of the upper base, an installation hole penetrating through the upper base and the lower base is formed in the bottom face of the installation table, and the fuzz button assembly comprises a fuzz button assembly and a tail end throwing line. The fuzz button combining piece is fixed on the base combining piece through the mounting hole, and the tail end throwing line is arranged below the fuzz button combining piece. Through the structural arrangement of the base assembly and the fuzz button assembly, the functions of data exchange and signal transmission between the testing device and an external structure are achieved, rapid, accurate and damage-free testing of the electrical performance of to-be-tested PCBs of different heights is achieved, the overall structure is simple, the machining technology is mature, and operation is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of PCB testing, and in particular to a PCB electrical performance testing device. Background Art

[0002] PCB is a carrier for electronic components to achieve reliable electrical connection. It is widely used in aviation, aerospace, shipbuilding, electronics, weapons and equipment in the military field. Nowadays, military PCB components are developing in the direction of high density, small pitch and multi-layer, which leads to bottlenecks such as high process difficulty and high complexity in the processing and molding of PCB components. In addition, some PCBs often have performance defects such as short circuit, open circuit and leakage after molding. If the faulty parts cannot be screened in time after PCB molding, it will cause unnecessary cost waste in the subsequent manufacturing process of PCB. Therefore, how to conduct fast, accurate and non-destructive electrical performance testing of PCB during the PCB molding process has become one of the bottlenecks restricting the development of PCB manufacturing industry.

[0003] In recent years, as PCB performance testing has developed towards elastic contact and non-destructive testing, testing technology based on the hairy button contact form has become one of the key technologies leading to breakthroughs in PCB performance testing. At the same time, the excellent solder-free performance and low-profile structural advantages of the hairy button contact can also be expanded to various structural forms of PCB electrical performance testing.

[0004] Commonly used PCB electrical performance test methods mainly include special, general and flying probe. Special test uses special fixtures for testing, which is only applicable to one type of PCB model. Its advantage is strong specialization, but its disadvantage is low versatility. The basic principle of general test is that the layout of PCB circuit is designed according to the grid (i.e. circuit density), and it is processed and designed according to the hole position. Its advantage is that the probe can be reused, but its disadvantage is that it is only applicable to low-density spacing test. The principle of flying probe test is to move two probes in the three directions of X, Y and Z to test the two endpoints of each circuit one by one, so there is no need to make professional fixtures. Its advantage is that the test method is simple, but its disadvantage is that the test speed is slow.

[0005] For example, the patent document with the publication number CN220231914U specifically discloses a PCB board test device, including a test box, a test structure connected to the test box, a replacement structure and a downward pressure structure, the test structure includes a needle plate and the installation slot, the test box is detachably connected with the needle plate, the interior of the installation slot is installed with a PCB board body, the downward pressure structure is used to apply pressure to the PCB board body, so that the PCB board body is fully in contact with the probe, and the pressure plate is quickly replaced by the limit structure, which is suitable for applying downward pressure to PCB board bodies of different sizes. The general test principle adopted by the device is only suitable for low-density spacing testing.

[0006] In summary, the current existing technologies generally have defects such as poor test accuracy, low versatility, slow test speed, etc. Therefore, there is an urgent need for a test device based on the hair button contact form test technology that can realize fast, accurate and non-destructive testing of electrical properties during PCB molding. Summary of the invention

[0007] In view of the problems existing in the prior art, the present invention provides a PCB electrical performance testing device.

[0008] The present invention is implemented in this way. It provides a PCB electrical performance testing device including a base assembly, a wool button assembly and a tail end sling, wherein the base assembly includes an upper base, a lower base and a stud, the upper base is fixed to the lower base by the stud, a mounting platform is arranged on the inner side of the upper base, a mounting hole penetrating the upper base and the lower base is arranged on the bottom surface of the mounting platform, the wool button assembly is fixed to the base assembly through the mounting hole, and the tail end sling is arranged below the wool button assembly.

[0009] Furthermore, the stud is arranged at four corners of the upper base and the lower base, the positioning end of the stud is placed in the lower base, the part of the stud protruding from the upper base is provided with a thread, and the middle part of the stud is provided as a square protrusion.

[0010] Furthermore, a square groove matching with the square protrusion is provided at the bottom of the upper base, and the square protrusion is completely embedded in the square groove.

[0011] Furthermore, a through structure is provided between the upper base and the lower base, and an avoidance groove is provided in the inner wall of the through structure.

[0012] Furthermore, guide pins are arranged inside the four corners of the upper base and the lower base.

[0013] Furthermore, the wool button assembly includes a floating contact cap, a wool button contact piece and a needle body assembly, the floating contact cap is arranged above the wool button contact piece, the wool button contact piece is arranged above the needle body assembly, a tail end fixing glue is arranged at the lower end of the needle body assembly, and the tail end swing line is connected to the lower end of the needle body assembly through the tail end fixing glue.

[0014] Furthermore, the floating contact cap is a sharp corner having guiding and contacting functions, and the floating contact cap can float axially.

[0015] Furthermore, the floating contact cap has a floating contact cap tip and a step at the floating contact cap tip at its upper end, the step at the floating contact cap tip is located below the floating contact cap tip, and a round stepped column is provided at the tail end of the floating contact cap.

[0016] Furthermore, the step diameter at the tip corner of the floating contact cap is larger than the metal hole diameter of the PCB to be tested and smaller than twice the width from the inner wall of the mounting platform to the center point of the mounting hole.

[0017] Furthermore, the upper circle diameter of the circular stepped column is the same as the diameter of the hair button contact piece, and the lower circle diameter is the same as the diameter of the floating contact cap column part.

[0018] In summary, the beneficial effect of the present invention is that the function of data exchange and signal transmission between the test device and the external structure can be realized through the setting of the wool button assembly, and the versatility of the structure is enhanced by the setting of the floating contact cap, so that the test device can be quickly matched with the design according to the height changes of different PCBs, and the electrical performance of the PCBs to be tested at different heights can be accurately and non-destructively tested. The upper and lower split structures of the base assembly can realize the rapid assembly of the test device, with greater flexibility, easy installation and disassembly, and the overall structure is simple, the processing technology is mature, and it is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the stud of the present invention;

[0022] Figure 3 It is a schematic structural diagram of the wool button fastener of the present invention;

[0023] Figure 4 It is a structural schematic diagram of the guide pin of the present invention;

[0024] Figure 5 is a schematic structural diagram of a floating contact cap of the present invention;

[0025] Figure 6 It is a schematic diagram of the top view of the square convex block of the present invention;

[0026] Figure 7 It is a schematic diagram of an implementation of the present invention;

[0027] Explanation of the accompanying numbers: 1-upper base; 2-lower base; 3-stud; 4-guide pin; 5-avoidance slot; 6-floating contact cap; 7-wool button contact piece; 8-needle body assembly; 9-tail end fixing glue; 10-floating contact cap tip; 11-step at the floating contact cap tip; 12-the tail end of the floating contact cap is a round stepped column; 13-square bump; 14-test device tail end throw line; 15-thread; 16-positioning end; 17-PCB to be tested; 18-PCB testing device. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Combination Figures 1 to 7 The figure shows a specific embodiment of a PCB electrical performance testing device provided by the present invention, and the specific contents are as follows:

[0030] The PCB electrical performance testing device provided by the embodiment of the present invention includes: a base assembly, a wool button assembly and a tail end sling 14, the base assembly includes an upper base 1, a lower base 2 and a stud 3, the upper base 1 is fixed to the lower base 2 by the stud 3, a mounting platform is arranged on the inner side of the upper base 1, and a mounting hole penetrating the upper base 1 and the lower base 2 is arranged on the bottom surface of the mounting platform, the wool button assembly is fixed on the base assembly through the mounting hole, and the tail end sling 14 is arranged below the wool button assembly. The above device has a simple structure and is universal. Through the arrangement of the wool button assembly, the design can be quickly matched according to the height changes of different PCBs, so as to realize accurate and non-destructive testing of the electrical performance of PCBs to be tested at different heights, and the base assembly is an upper and lower split structure, which can realize rapid assembly of the testing device.

[0031] In this embodiment, the stud 3 is arranged at the four corners of the upper base 1 and the lower base 2, the positioning end 16 of the stud 3 is placed in the lower base 2, the part of the stud 3 protruding from the upper base 1 is provided with a thread 15, and the middle part of the stud 3 is provided with a square protrusion 13. By providing a thread on the stud 3, the PCB to be tested and the test device can be reliably locked. By providing the positioning end 16 of the stud 3, the stud 3 can be fixed in the base assembly, is not easy to be displaced, and the cooperation with the PCB to be tested is more reliable. The stud 3 is not easy to rotate by the provision of the square protrusion 13.

[0032] In this embodiment, a square groove cooperating with the square protrusion 13 is provided at the bottom of the upper base 1, and the square protrusion 13 is completely embedded in the square groove. The cooperation between the square protrusion 13 and the square groove ensures that the stud 3 will not rotate when the PCB to be tested and the test device are locked, thereby playing an anti-rotation role and improving the locking effect.

[0033] In this embodiment, a through structure is formed between the upper base 1 and the lower base 2 , and an avoidance groove 5 is provided in the inner wall of the through structure, so as to realize the avoidance function of the non-test area of ​​the PCB to be tested.

[0034] In this embodiment, guide pins 4 are further provided inside the four corners of the upper base 1 and the lower base 2. The upper base 1 and the lower base 2 are reliably fixed by adopting the guide pins 4. The guide pins 4 are provided inside the four corners so that each guide pin 4 is subjected to uniform force during the assembly process and the use process, and the fixing effect is better.

[0035] In this embodiment, the wool button assembly includes a floating contact cap 6, a wool button contact piece 7 and a needle body assembly 8, the floating contact cap 6 is arranged above the wool button contact piece 7, the wool button contact piece 7 is arranged above the needle body assembly 8, the lower end of the needle body assembly 8 is provided with a tail end fixing glue 9, the tail end swing line 14 is connected to the lower end of the needle body assembly 8 through the tail end fixing glue 9, the wool button assembly is reliably fixed by opening mounting holes on the upper base 1 and the lower base 2, one end of the wool button assembly is axially floating, and the other end is the tail end swing line 14 of the swing line structure, the tail end swing line 14 can be connected to the external test interface, thereby realizing the function of data exchange and signal transmission between the test device and the external structure.

[0036] In this embodiment, the floating contact cap 6 is a sharp corner having guiding and contacting functions. The floating contact cap 6 can float axially, thereby ensuring the position accuracy and contact reliability with the PCB to be tested during the test process.

[0037] In this embodiment, a floating contact cap tip 10 and a step 11 at the floating contact cap tip are provided at the upper end of the floating contact cap 6, and the step 11 at the floating contact cap tip is located below the floating contact cap tip 10. A circular stepped column 12 is provided at the tail end of the floating contact cap 6. By providing the floating contact cap tip 10 and the step 11 at the floating contact cap tip, the step 11 at the floating contact cap tip has a limiting function, the floating contact cap tip 10 can float axially, and can be used with different PCB height changes. The tail end of the floating contact cap 6 is provided with a circular stepped column 12 structure, which can be fixed to the mounting hole of the upper base 1 by stamping, and has better stability.

[0038] In this embodiment, the diameter of the step 11 at the tip corner of the floating contact cap is larger than the metal hole diameter of the PCB to be tested and smaller than twice the width from the inner wall of the mounting platform to the center point of the mounting hole. Its designed diameter is larger than the metal hole diameter of the PCB to be tested, which can ensure that the test fixture will not be damaged after the PCB to be tested is locked with the test device, thereby achieving the reusability of the test device and reducing the test cost.

[0039] In this embodiment, the upper circle diameter of the circular stepped column body 12 is the same as the diameter of the wool button contact piece 7, and the lower circle diameter is the same as the diameter of the cylindrical part of the floating contact cap 6. The inclined surface structure of the circular stepped column body 12 is a structure with a larger end and a smaller end, which has an anti-slip function and can ensure that the floating contact cap 6 will not fall out after being stamped into the mounting hole of the upper base 1.

[0040] In the embodiment, the test device realizes the data exchange and signal transmission between the test device and the external structure through the setting of the wool button fitting; the versatility of the structure is enhanced by the setting of the floating contact cap, so that the test device can be quickly matched with the design according to the height change of different PCBs, and the electrical performance of the PCBs to be tested at different heights can be accurately and non-destructively tested; the upper and lower split structures of the base fitting are set to realize the rapid assembly of the test device, enhance the flexibility of the device, and facilitate installation and disassembly, and the overall structure is simple, the processing technology is mature, and it is easy to operate. The test device as a whole can realize the rapid, accurate and non-destructive testing of the electrical performance during the PCB molding process.

[0041] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A PCB electrical performance testing device, characterized in that: The invention comprises a base assembly, a wool button assembly and a tail end swing line (14), wherein the base assembly comprises an upper base (1), a lower base (2) and a stud (3), wherein the upper base (1) is fixed to the lower base (2) via the stud (3), a mounting platform is arranged on the inner side of the upper base (1), and a mounting hole penetrating the upper base (1) and the lower base (2) is arranged on the bottom surface of the mounting platform, wherein the wool button assembly is fixed to the base assembly via the mounting hole, and the tail end swing line (14) is arranged below the wool button assembly.

2. The PCB electrical performance testing device according to claim 1, characterized in that: The stud (3) is arranged at four corners of the upper base (1) and the lower base (2), the positioning end (16) of the stud (3) is placed in the lower base (2), the part of the stud (3) protruding from the upper base (1) is provided with a thread (15), and the middle part of the stud (3) is provided with a square protrusion (13).

3. The PCB electrical performance testing device according to claim 2, characterized in that: The bottom of the upper base (1) is provided with a square groove which matches the square protrusion (13), and the square protrusion (13) is completely embedded in the square groove.

4. The PCB electrical performance testing device according to claim 1, characterized in that: A through structure is formed between the upper base (1) and the lower base (2), and an avoidance groove (5) is provided in the inner wall of the through structure.

5. The PCB electrical performance testing device according to any one of claims 1 to 4, characterized in that: Guide pins (4) are also arranged inside the four corners of the upper base (1) and the lower base (2).

6. The PCB electrical performance testing device according to claim 1, characterized in that: The wool button assembly comprises a floating contact cap (6), a wool button contact piece (7) and a needle body assembly (8); the floating contact cap (6) is arranged above the wool button contact piece (7); the wool button contact piece (7) is arranged above the needle body assembly (8); a tail end fixing glue (9) is arranged at the lower end of the needle body assembly (8); and the tail end swing line (14) is connected to the lower end of the needle body assembly (8) via the tail end fixing glue (9).

7. The PCB electrical performance testing device according to claim 6, characterized in that: The floating contact cap (6) is a sharp corner having guiding and contacting functions, and the floating contact cap (6) can float axially.

8. The PCB electrical performance testing device according to claim 7, characterized in that: The upper end of the floating contact cap (6) is provided with a floating contact cap tip (10) and a step (11) at the floating contact cap tip; the step (11) at the floating contact cap tip is located below the floating contact cap tip (10); and the tail end of the floating contact cap (6) is provided with a round stepped column (12).

9. The PCB electrical performance testing device according to claim 8, characterized in that: The diameter of the step (11) at the tip corner of the floating contact cap is larger than the diameter of the metal hole of the PCB to be tested and smaller than twice the width from the inner wall of the mounting platform to the center point of the mounting hole.

10. The PCB electrical performance testing device according to claim 9, characterized in that: The upper circle diameter of the circular stepped column (12) is the same as the diameter of the wool button contact piece (7), and the lower circle diameter is the same as the diameter of the column part of the floating contact cap (6).

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