CN113359005A

CN113359005A - Clamp and method for testing needle points of PCBA (printed circuit board assembly)

Info

Publication number: CN113359005A
Application number: CN202110542320.XA
Authority: CN
Inventors: 涂海涛; 薛国荣; 冼祖国; 梁峰国; 蒋三海
Original assignee: Shenzhen Haichuangjia Technology Co ltd
Current assignee: Shenzhen Haichuangjia Technology Co ltd
Priority date: 2021-05-18
Filing date: 2021-05-18
Publication date: 2021-09-07
Anticipated expiration: 2041-05-18
Also published as: CN113359005B

Abstract

The invention relates to a fixture and a test method for testing needle points of a PCBA (printed circuit board assembly), wherein the fixture for testing the needle points of the PCBA comprises a lower shell and an upper shell, a first interface needle and a second interface needle are arranged at the bottom of the inner wall of the lower shell, the number of the second interface needles is multiple, the lower shell is movably connected with the upper shell through a hinge and a connecting rod, and a probe board is fixedly connected onto the upper shell through a fixing bolt. The fixture and the test method for testing the pin points of the PCBA have the advantages that due to the fact that the infrared emitter and the infrared receiver are adopted, compared with the prior art, the infrared emitter and the infrared receiver are used, the pin points which are obviously unstable in connection or not welded are detected firstly, the qualified PCBA is detected, and then ICT is used for detection, time is saved, different PCBA can be conveniently detected by replacing different probe plates, and resources are saved.

Description

Clamp and method for testing needle points of PCBA (printed circuit board assembly)

Technical Field

The invention relates to the technical field of PCBA testing, in particular to a fixture and a testing method for testing pins of a PCBA board.

Background

PCBA (printed Circuit Board Assembly) refers to the whole process of PCB blank Board passing through SMT loading or DIP plug-in. The pin point test is a branch of the PCBA test, and mainly tests the continuity of PAD points (some welding points of electronic components to be welded on the PCB), pins (which refer to electronic components with pins, such as resistors, and the shape is often a hole shape), gold fingers (which refer to large copper points on the PCB), and other related functional tests.

In-circuit testers (ICTs) are widely used in the PCBA process industry for their excellent testing and inspection performance. The ICT can find problems with solder and components in the PCBA. It has high speed and high stability.

Where electrical probes are used to test Printed Circuit Boards (PCBs) for short circuits, open circuits, resistors, capacitors and other basic quantities to show whether the assembly is manufactured correctly. However, during detection, different probe cards cannot be replaced according to different detection points, different clamps need to be purchased, resources are wasted, the use is not simple and convenient, and for the needle points which are obviously unstable in connection or are not welded, ICT is directly used for detection, and time and resources are wasted.

Disclosure of Invention

Technical problem to be solved

In view of the above disadvantages and shortcomings of the prior art, the invention provides a fixture for testing pin points of a PCBA board and a testing method thereof, which solve the technical problems that a probe board is fixed on the fixture and is inconvenient to replace, and no pin points which are not welded or are welded and broken are screened to directly perform ICT, thereby wasting resources.

(II) technical scheme

In order to achieve the purpose, the invention adopts the main technical scheme that:

in a first aspect, an embodiment of the present invention provides a fixture for testing pin points of a PCBA board, including a lower housing and an upper housing, wherein a bottom portion of an inner wall of the lower housing is provided with a first interface pin and a second interface pin, a plurality of second interface pins are provided, the lower housing is movably connected with the upper housing through a hinge and a connecting rod, the upper housing is fixedly connected with a probe board through a fixing bolt, the probe board is provided with a first probe and a second probe, the upper housing is provided with a placing groove, the probe board is clamped in the placing groove, the placing groove is fixedly connected with four elastic pressure bars, the four elastic pressure bars are uniformly distributed at four corners of the placing groove, the four elastic pressure bars are provided with limit pressure bars, the four limit pressure bars are fixedly connected with the same limiting pressure bar, the PCBA board is clamped on the support board, the infrared ray transmitting device is characterized in that an infrared ray transmitter and an infrared ray receiver are respectively arranged on two sides of the top of the carrier plate, the first interface needle is connected with an equipment power wiring end through a first wire, the first probe is connected with the equipment power wiring end through a second wire, and the second probe is connected with the second interface needle through a third wire.

According to the clamp for testing the pin points of the PCBA, the contact surfaces of the probes on the probe board and the pin points of the PCBA are protected through the arrangement of the elastic pressing rods and the limiting pressing rods, the abrasion of the probes is reduced, the first probes, the second probes, the first interface pins, the second interface pins and the equipment power supply terminal form a loop through the arrangement of the first conducting wires, the second conducting wires and the third conducting wires, and whether the PCBA is short-circuited or open-circuited or not, and the resistance, the capacitance and other basic quantities can be checked to display whether the assembly is manufactured correctly or not.

Optionally, a first fixed block of fixedly connected with on the support plate, go up fixedly connected with second fixed block on the casing, first movable groove and second movable groove have been seted up on first fixed block and the second fixed block respectively, it is connected with the regulation pole to rotate on the second fixed block, fixedly connected with dead lever on the regulation pole, the other end joint of dead lever is in first movable groove. Under the combined action of the first fixing block, the second fixing block, the first movable groove, the second movable groove, the adjusting rod and the like, the first fixing block and the second fixing block can be fixed together, and therefore the PCBA board can be stably contacted with the probe.

Optionally, the carrier plate is made of an antistatic material.

In a second aspect, embodiments of the present invention provide a method of testing a fixture for testing pin points on a PCBA board, including,

s1: selecting a probe board suitable for the PCBA board, and fixing the probe board in a placing groove on the upper shell through a fixing bolt;

s2: connecting the first probe with the equipment power supply terminal by using a second lead, and then connecting the second probe with the second interface pin by using a third lead;

s3: placing the carrier plate with the PCBA board above the placing groove, and pressing the carrier plate downwards to enable the probes to be in contact with the needle points on the PCBA board;

s4: the needle points on the PCBA board are detected using an infrared transmitter and an infrared receiver.

And step S4, detecting whether the needle point has obvious unconnected stable trace, and detecting by ICT after the needle point is qualified.

According to the test method of the fixture for testing the pin points of the PCBA, provided by the embodiment of the invention, different positions on the PCBA can be detected by installing different probe plates, and PCBAs with different pin points can also be detected, so that the detection is more convenient.

Alternatively, the probes on the probe card may be shaped as 30 ° sharp needles, two-jaw needles, blunt needles, 4-jaw or 7-jaw needles.

Different probe shapes can detect different needle points. The PAD point is detected by a 30-degree sharp needle or two-claw needle, the pin is a blunt needle or 4-claw or 7-claw needle, the golden finger is a sharp needle or 2-claw needle, and the shape of the probe can be selected according to actual requirements.

(III) advantageous effects

The invention has the beneficial effects that: according to the fixture and the test method for testing the pin points of the PCBA, due to the fact that the infrared emitter and the infrared receiver are adopted, compared with the prior art, the infrared emitter and the infrared receiver are used, the pin points which are obviously connected and unstable or are not welded are detected, the qualified PCBA is detected, and then ICT is used for detection, time is saved, different PCBA boards can be conveniently detected by replacing different probe boards, and resources are saved.

Drawings

FIG. 1 is a schematic front view of a fixture and a test method for testing pins of a PCBA board according to an embodiment 1 of the present invention;

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;

fig. 3 is a schematic perspective view of the present invention.

[ description of reference ]

1. An upper housing; 2. an equipment power terminal; 3. a lower housing; 4. a first conductive line; 5. a first interface pin; 6. a second interface pin; 7. a second conductive line; 8. a second probe; 9. a first probe; 10. PCBA board; 11. a carrier plate; 12. an infrared emitter; 13. an infrared receiver; 14. a second fixed block; 15. a first fixed block; 16. a first movable slot; 17. a second movable slot; 18. adjusting a rod; 19. elastic pressing rods; 20. and limiting the pressing rod.

Detailed Description

For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings. In which the terms "upper", "lower", etc. are used herein with reference to the orientation of fig. 1.

According to the infrared transmitter 12 and the infrared receiver 13 provided by the embodiment of the invention, the pin points which are obviously connected and are unstable or not welded are detected, the qualified PCBA board 10 is detected, and ICT is used for detection, so that the time is saved, the contact surfaces of the pins of the probe board and the pin points of the PCBA board 10 are protected through the arrangement of the elastic pressing rod 19 and the limiting pressing rod 20, the abrasion of the probes is reduced, and the first probe 9, the second probe 8, the first interface pin 5, the second interface pin 6 and the equipment power supply terminal 2 form a loop through the arrangement of the first lead 4, the second lead 7 and the third lead, so that whether the PCBA board 10 is short-circuited or open-circuited or not and whether the resistance, the capacitance and other basic quantities are detected to show whether the assembly is manufactured correctly or not.

In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

Detailed description of the preferred embodiments

Example 1:

referring to fig. 1, 2 and 3, a fixture for testing needle points of a PCBA board comprises a lower housing 3 and an upper housing 1, wherein a first interface needle 5 and a second interface needle 6 are arranged at the bottom of the inner wall of the lower housing 3, a plurality of second interface needles 6 are arranged, the lower housing 3 is movably connected with the upper housing 1 through hinges and connecting rods, a probe board is fixedly connected with the upper housing 1 through fixing bolts, a first probe 9 and a second probe 8 are arranged on the probe board, a placing groove is arranged on the upper housing 1, the probe board is clamped in the placing groove, elastic pressure rods 19 are fixedly connected in the placing groove, the number of the elastic pressure rods 19 is four, the four elastic pressure rods 19 are uniformly distributed at four corners of the placing groove, limiting pressure rods 20 are arranged on the four elastic pressure rods 19, and the same carrier plate 11 is fixedly connected with the four limiting pressure rods 20, the material of support plate 11 is made by antistatic material, the joint has PCBA board 10 on support plate 11, the top both sides of support plate 11 are provided with infrared emitter 12 and infrared receiver 13 respectively, first interface needle 5 is connected with equipment power connection end 2 through first wire 4, first probe 9 is connected with equipment power connection end 2 through second wire 7, second probe 8 passes through the third wire with second interface needle 6 and is connected, and setting through infrared emitter 12 and infrared receiver 13 uses infrared emitter 12 and infrared receiver 13, detects the needle point that has obvious connection unstability or not welded earlier, detects qualified PCBA board 10, uses ICT to detect again, has saved the time, through changing different probe card, conveniently detects different PCBA boards 10, has saved the resource.

The utility model discloses a PCBA probe card, including support plate 11, last fixedly connected with first fixed block 15 of fixedly connected with, go up fixedly connected with second fixed block 14 on the casing 1, first movable groove 16 and second movable groove 17 have been seted up on first fixed block 15 and the second fixed block 14 respectively, it is connected with regulation pole 18 to rotate on the second fixed block 14, fixedly connected with dead lever on the regulation pole 18, the other end joint of dead lever is in first movable groove 16, under the combined action of first fixed block 15, second fixed block 14, first movable groove 16, second movable groove 17 and regulation pole 18 etc., can make first fixed block 15 and second fixed block 14 fix together to can make PCBA board 10 and probe carry out the stationary contact.

Example 2:

referring to fig. 1 and 2, a method of testing a fixture for testing pin points of a PCBA board, comprises,

s1: selecting a probe board suitable for the PCBA board 10, fixing the probe board in a placing groove on the upper shell 1 through a fixing bolt, wherein the shape of a probe on the probe board can be a 30-degree sharp needle, two claw needles, a blunt needle, 4 claws or 7 claw needles, the different shapes of the probe can detect different needle points, the 30-degree sharp needle or the two claw needles are usually selected for detecting a PAD point, the blunt needle or the 4 claws or the 7 claw needles are usually selected for a pin, the sharp needle or the 2 claw needle is usually selected for a golden finger, and the shape of the probe can be selected according to actual requirements;

s2: connecting the first probe 9 with the equipment power terminal 2 by using a second lead 7, and then connecting the second probe 8 with the second interface pin 6 by using a third lead;

s3: placing the carrier plate 11 with the PCBA board 10 above the placing groove, pressing the movable carrier plate 11 downwards, and enabling the probe to be in contact with the needle point on the PCBA board 10 under the limiting and buffering of the limiting pressing rod 20 and the elastic pressing rod 19;

s4: during detection, the infrared emitter 12 and the infrared receiver 13 are used for detecting the needle points on the PCBA board 10, whether the needle points have obvious unconnected stable traces or not is determined, and ICT is used for detecting after the needle points are qualified.

Before detection, the adjusting rod 18 can be rotated to slide the adjusting rod 18 from the second movable groove 17 into the first movable groove 16, so that the adjusting rod 18 can be fixed in the second fixed groove, and the contact point between the probe and the needle point can be relatively stable.

In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either as communication within the two elements or as an interactive relationship of the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, a first feature may be "on" or "under" a second feature, and the first and second features may be in direct contact, or the first and second features may be in indirect contact via an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lower level than the second feature.

In the description herein, the description of the terms "one embodiment," "some embodiments," "an embodiment," "an example," "a specific example" or "some examples" or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the above embodiments without departing from the scope of the present invention.

Claims

1. A clamp for testing needle points of a PCBA (printed circuit board assembly) board comprises a lower shell (3) and an upper shell (1), and is characterized in that a first interface needle (5) and a second interface needle (6) are arranged at the bottom of the inner wall of the lower shell (3), a plurality of second interface needles (6) are arranged, the lower shell (3) is movably connected with the upper shell (1) through a hinge and a connecting rod, a probe board is fixedly connected onto the upper shell (1) through a fixing bolt, a first probe (9) and a second probe (8) are arranged on the probe board, a placing groove is formed in the upper shell (1), the probe board is clamped in the placing groove, elastic pressure rods (19) are fixedly connected into the placing groove, the number of the elastic pressure rods (19) is four, the four elastic pressure rods (19) are uniformly distributed in four corners of the placing groove, and limiting pressure rods (20) are arranged on the four elastic pressure rods (19), four same support plate (11) of fixedly connected with is gone up to spacing pressure stick (20), the joint has PCBA board (10) on support plate (11), the top both sides of support plate (11) are provided with infrared emitter (12) and infrared receiver (13) respectively, first interface needle (5) are connected with equipment power connection end (2) through first wire (4), first probe (9) are connected with equipment power connection end (2) through second wire (7), second probe (8) are connected through the third wire with second interface needle (6).

2. A fixture for testing pins of a PCBA board, as claimed in claim 1, wherein: the support plate is characterized in that a first fixing block (15) is fixedly connected to the support plate (11), a second fixing block (14) is fixedly connected to the upper shell (1), and a first movable groove (16) and a second movable groove (17) are formed in the first fixing block (15) and the second fixing block (14) respectively.

3. A fixture for testing pins of a PCBA board, as claimed in claim 2, wherein: the second fixing block (14) is rotatably connected with an adjusting rod (18), the adjusting rod (18) is fixedly connected with a fixing rod, and the other end of the fixing rod is clamped in the first movable groove (16).

4. A fixture for testing pins of a PCBA board, as claimed in claim 1, wherein: the material of the carrier plate (11) is made of an antistatic material.

5. A method of testing a fixture for testing pin points on a PCBA board as claimed in any one of claims 1 to 4, comprising,

s1: selecting a probe board suitable for the PCBA board (10), and fixing the probe board in a placing groove on the upper shell (1) through a fixing bolt;

s2: connecting the first probe (9) with the equipment power terminal (2) using a second wire (7), and then connecting the second probe (8) with the second interface pin (6) using a third wire;

s3: placing the carrier plate (11) provided with the PCBA (printed circuit board assembly) plate (10) above the placing groove, and pressing the carrier plate (11) downwards to enable the probes to be in contact with the needle points on the PCBA plate (10);

s4: the needle points on the PCBA board (10) are detected using an infrared emitter (12) and an infrared receiver (13).

6. A method of testing a fixture for testing pins of a PCBA board as recited in claim 5, wherein: the probes on the probe board are in the shapes of 30-degree sharp needles, two-claw needles, blunt needles, 4-claw or 7-claw needles.