阅读说明：本技术 一种检测治具及跪针检测方法 (Detection jig and kneeling needle detection method ) 是由 章伟 于 2019-10-29 设计创作，主要内容包括：本申请提供了一种检测治具及跪针检测方法,所述检测治具包括治具主体、相互平行的测试针和定位板,所述治具主体和定位板上均设有与电路板待测区域的板孔一一对应的针孔,所述测试针一一对应的设置的所述治具主体和定位板的针孔中,并可沿针孔滑动,所述定位板与所述治具主体间隔设置且滑动连接,所述治具主体内部的定位弹性件使所述测试针具有向下的推力,确保与连接器针尾良好的接触。本申请所述的测试治具结构简单,仅仅通过测试针端面的高度差即可反应出是否有跪针现象的发生,检测结果分析直观快速,且无需使用x-ray发射装置等昂贵的仪器,能够大大的降低检测装置的成本。(The application provides a detection tool and kneel needle detection method, detection tool includes tool main part, test needle and locating plate that are parallel to each other, all be equipped with the pinhole with the regional diaphragm orifice one-to-one that awaits measuring of circuit board on tool main part and the locating plate, the setting of test needle one-to-one in the pinhole of tool main part and locating plate to can follow the pinhole and slide, the locating plate with tool main part interval sets up and sliding connection, the inside location elastic component of tool main part makes the test needle has decurrent thrust, ensures with the good contact of connector needle tail. The application test fixture simple structure, only can respond out the emergence whether have the needle phenomenon of kneeling through the difference in height of test needle terminal surface, the analysis of testing result is directly perceived quick, and need not to use expensive instruments such as x-ray emitter, reduction detection device's that can be great cost.)

1. The utility model provides a detection tool which characterized in that, detection tool includes:

the jig comprises a jig main body, wherein a first pinhole and an elastic piece cavity are arranged on the jig main body, the first pinhole corresponds to plate holes of a region to be tested of a circuit board one by one, the elastic piece cavity is formed by radially extending a non-end part region of the first pinhole, and a first elastic piece is arranged in the elastic piece cavity;

the test needles are parallel to each other, correspond to the first needle holes one by one and are connected with the first needle holes in a sliding mode, and the lengths of the test needles are equal; the test needle is provided with a first blocking part, the first blocking part is blocked at the lower end of the elastic part cavity, the first elastic part is sleeved on the test needle, and two ends of the first elastic part are limited by the top of the elastic part cavity and the first blocking part respectively;

the positioning plate is provided with second needle holes which correspond to the first needle holes one by one, and the test needles are connected with the second needle holes in a sliding manner; the positioning plate and the jig main body are arranged at intervals, a connecting rod parallel to the test needle is arranged on the positioning plate, the lower end of the connecting rod is fixedly connected with the guide plate, the upper end of the connecting rod is slidably connected with the jig main body, a second blocking part is arranged on the connecting rod, and the lower surface of the second blocking part is blocked by the jig main body, so that the lower end of the test needle extends out of the positioning plate at equal distance.

2. The testing jig of claim 1, wherein the lower end of the testing needle is hemispherical or conical.

3. The inspection jig of claim 1, wherein at least two connecting rods are provided.

4. The detecting tool according to claim 1, wherein the tool body comprises an upper pressing plate, a tubular plate and a lower pressing plate which are sequentially connected from top to bottom, the upper pressing plate and the lower pressing plate are provided with first pinholes corresponding to each other, and the tubular plate is provided with an elastic member cavity corresponding to the first pinholes.

5. The inspection fixture according to claim 4, wherein the fixture body includes an observation plate, the observation plate is disposed at an upper end of the upper press plate and is fixed to the upper press plate, and the observation plate is provided with a corresponding first pinhole.

6. The detection jig according to claim 4, wherein the jig main body comprises a connecting plate, the connecting plate is arranged at the lower end of the lower pressing plate and fixedly connected with the lower pressing plate, and the observation plate is provided with a corresponding first pinhole; be equipped with the upper side ear on the relative side of top board, be equipped with on the connecting plate with the downside ear that the upper side ear corresponds, the upper end of connecting rod is passed the downside ear with the upper side ear, with side ear sliding connection, the lower surface quilt of second card fender portion the upper surface card of downside ear keeps off, still be equipped with the second elastic component on the connecting rod, the both ends of second elastic component quilt respectively the upper side ear with the card of second card fender portion keeps off.

7. The inspection jig according to claim 1, wherein the number of the test needles is 50 to 150.

8. The inspection jig according to claim 1, wherein the diameter of the test pin is 0.2 to 1 mm.

9. The inspection fixture of claim 1, wherein the first resilient member is configured as a compression spring and the second resilient member is configured as a compression spring.

10. A kneeling needle detection method for the detection jig according to any one of claims 1 to 9, characterized by comprising the following steps:

after the area to be tested of the circuit board is connected with the connector, the lower end of the test needle extends into the plate hole in a one-to-one correspondence manner with the plate hole of the area to be tested of the circuit board from the direction opposite to the connection direction, and the guide plate is attached to the surface of the circuit board;

driving the jig main body to move downwards, wherein each test pin extends into the bottom of the corresponding plate hole and is in contact with the pin tail of the connector;

observing the upper ends of the test needles, and if the upper ends of the test needles are level, avoiding the phenomenon of kneeling needles; and if the upper end of each test needle has a height difference, the area to be tested of the circuit board has a kneeling needle phenomenon.

Technical Field

The application relates to a detection jig, especially relates to a detection jig.

Background

The pin kneeling phenomenon, as shown in fig. 1, refers to a phenomenon that the pin 21 of the connector, also called a fish eye, is not correctly and completely pressed into the corresponding hole 11 of the circuit board during the process of pressing the circuit board 1 and the connector 2, resulting in the pin breakage, bending and twisting of the pin between the bottom of the connector and the circuit board. Since it occurs between the bottom of the connector and the circuit board, it cannot be directly discovered after the crimping is completed. If the product cannot be detected and found in time, the product has serious hidden quality trouble.

At present, the kneeling needle phenomenon is detected mainly by using X-ray (X-ray). The circuit board after crimping and assembling is put into an X-ray detection device, the circuit board is subjected to perspective shooting by utilizing the high-strength penetrability of the X-ray to form a picture, and the picture formed by X-ray perspective is analyzed, so that the kneeling needle phenomenon is found. Typically, X-ray detection devices include both 2D and 3D. 2D X-ray is a positive perspective picture of the whole product taken by X-ray, and the projection size and the abnormality of the pin tail of the connector around the crimping hole are compared, thereby judging whether the kneeling pin phenomenon exists or not. 3D X-ray is to take the multi-angle perspective picture of the whole product by X-ray, and to get the cut layer image of the relevant layer of the product by special arithmetic operation, to find out whether there is missing point, to judge whether there is kneeling needle. The X-ray detection device is short in test time, but the test device is high in cost and difficult in result analysis.

Disclosure of Invention

In view of the aforesaid of the detection existence of present pin of kneeling phenomenon not enough, this application provides a detection tool, simple structure, reduction detection device's that can be great cost, and the testing result analysis is directly perceived quick.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

a detection jig includes:

the jig comprises a jig main body, wherein a first pinhole and an elastic piece cavity are arranged on the jig main body, the first pinhole corresponds to plate holes of a region to be tested of a circuit board one by one, the elastic piece cavity is formed by radially extending a non-end part region of the first pinhole, and a first elastic piece is arranged in the elastic piece cavity;

the test needles are parallel to each other, correspond to the first needle holes one by one and are connected with the first needle holes in a sliding mode, and the lengths of the test needles are equal; the test needle is provided with a first blocking part, the first blocking part is blocked at the lower end of the elastic part cavity, the first elastic part is sleeved on the test needle, and two ends of the first elastic part are limited by the top of the elastic part cavity and the first blocking part respectively;

the positioning plate is provided with second needle holes which correspond to the first needle holes one by one, and the test needles are connected with the second needle holes in a sliding manner; the positioning plate and the jig main body are arranged at intervals, a connecting rod parallel to the test needle is arranged on the positioning plate, the lower end of the connecting rod is fixedly connected with the guide plate, the upper end of the connecting rod is slidably connected with the jig main body, a second blocking part is arranged on the connecting rod, and the lower surface of the second blocking part is blocked by the jig main body, so that the lower end of the test needle extends out of the positioning plate at equal distance.

First card fender portion, elastic component chamber, first elastic component and test needle's cooperation, the elasticity that first elastic component produced because of the deformation makes test needle have decurrent thrust, ensures that the lower extreme of test needle keeps in contact with the backshank of connector, and after the test is accomplished, also can make the both ends of being tested the needle reset. The cooperation of connecting rod, second card fender portion, locating plate and tool main part makes the deflector with tool main part spaced sliding connection, the lower extreme of test needle stretches out the isometric distance of locating plate makes each test needle can be quick with the cooperation of the diaphragm orifice one-to-one in the region that awaits measuring of circuit board, the connecting rod still has the effect of direction, makes the probe needle can the perpendicular to circuit board. Wherein, one-to-one correspondence means that the number and the arrangement order are consistent.

If the pin kneeling phenomenon exists, the pin tail of the connector is not correctly and completely pressed into the corresponding plate hole of the circuit board, the pin of the connector pin tail is broken, bent or twisted, and the height difference of the pin tail is obviously changed. In addition, the circuit board has small board aperture, so that enough light cannot pass through the circuit board, and the circuit board is dark and cannot be observed by naked eyes. This application is isometric through setting up the test needle, before the detection begins, the upper end and the lower extreme of each test needle all keep in the coplanar, then stretch into each test needle in the diaphragm orifice that the circuit board awaits measuring the region, the lower extreme of each test needle with stop motion behind the backshank contact of connector, at this moment, the both ends of test needle can demonstrate the consistent difference in height of backshank of connector behind the crimping, whether the upper end through observing each test needle is in the coplanar, whether the analysis that can be quick has the emergence of kneeling needle phenomenon. The application test fixture simple structure, only can respond out the emergence whether have the needle phenomenon of kneeling through the difference in height of test needle terminal surface, the analysis of testing result is directly perceived quick, and need not to use expensive instruments such as x-ray emitter, reduction detection device's that can be great cost.

Preferably, the lower end of the test needle is hemispherical or conical. The lower end of the test needle is set to be in a shape from big to small, so that the test needle can still accurately extend into the plate hole corresponding to the to-be-detected area of the corresponding circuit board within a certain error range.

Preferably, the connecting rods are at least two, so that the connecting and positioning effects of the positioning plate are better.

Preferably, the tool main part is including top board, tubulose board and the holding down plate that from top to bottom connects gradually, be equipped with the first pinhole that corresponds each other on top board and the holding down plate, be equipped with on the tubulose board with the elastic component chamber that first pinhole corresponds. The multi-layer split structure is connected after being processed respectively, so that the processing is convenient, the process is simpler, and the cost is lower.

Preferably, the tool main part includes the observation board, the observation board sets up the upper end of top board, with the top board concreties, be equipped with corresponding first pinhole on the observation board. The observation plate is arranged to set a specific observation area, so that observation is more convenient.

Preferably, the tool main part includes the connecting plate, the connecting plate sets up the lower extreme of holding down plate, with the holding down plate concreties, be equipped with corresponding first pinhole on the observation board. Through the connecting plate, can adjust the thickness of tool main part, also make the more convenient manual drive of tool main part, perhaps driven by the manipulator.

Preferably, be equipped with the upper ear on the relative side of top board, be equipped with on the connecting plate with the downside ear that the upper ear corresponds, the upper end of connecting rod is passed the downside ear with the upper ear, with side ear sliding connection, the lower surface quilt of second card fender portion the upper surface card of lower ear keeps off, still be equipped with the second elastic component on the connecting rod, the both ends of second elastic component quilt respectively the upper ear with the card of second card fender portion keeps off. The second elastic piece enables the positioning plate to reset better due to the elastic force generated by the second deformation.

Preferably, the number of the test needles is 50-150. When the number of the test needles is within the range of 50-150, the test fixture is used for detection, so that the efficiency and the accuracy can be best.

Preferably, the diameter of test needle is 0.2 ~ 1mm, especially when the diameter of testing the needle at any time is not more than 0.5mm, uses this application test fixture detect, can make the better location of test needle, more quick accurate stretch into the circuit board waits to detect in the regional plate hole.

Preferably, the lower end of the test needle extends out of the positioning plate by 0.5-1 mm. And the lower end of the test needle can conveniently extend into a plate hole of the circuit board to be detected in the area by a short distance.

Preferably, the first blocking part is integrally formed with or detachably connected to the probe, and the second blocking part is integrally formed with or detachably connected to the guide rod. The blocking part is used for forming a step and forming a supporting part for providing blocking. The specific connection mode of the first blocking part and the test needle or the connecting rod can be selected according to a specific production process.

Preferably, the first elastic member is a compression spring, the second elastic member is a compression spring, and the elastic member can be selected according to the axial movement distance and the preset elastic force, and can also be a spring plate, a block body made of an elastic material, and the like.

The application also provides a kneeling needle detection method, which is used for the detection jig, and is characterized by comprising the following steps:

after the area to be tested of the circuit board is connected with the connector, the lower end of the test needle extends into the plate hole in a one-to-one correspondence manner with the plate hole of the area to be tested of the circuit board from the direction opposite to the connection direction, and the guide plate is attached to the surface of the circuit board;

driving the jig main body to move downwards, wherein each test pin extends into the bottom of the corresponding plate hole and is in contact with the pin tail of the connector;

observing the upper ends of the test needles, and if the upper ends of the test needles are level, avoiding the phenomenon of kneeling needles; and if the upper end of each test needle has a height difference, the area to be tested of the circuit board has a kneeling needle phenomenon.

Before the detection begins, the upper end and the lower extreme of each test needle all keep in the coplanar, then stretch into each test needle in the diaphragm orifice of the circuit board region of awaiting measuring, the lower extreme of each test needle with stop motion behind the backshank contact of connector, at this moment, the both ends of test needle can demonstrate the difference in height unanimous with the backshank of connector behind the crimping, whether the upper end through observing each test needle is in the coplanar, whether the analysis that can be quick has the emergence of the needle phenomenon of kneeling. The application test fixture simple structure, only can respond out the emergence whether have the needle phenomenon of kneeling through the difference in height of test needle terminal surface, the analysis of testing result is directly perceived quick, and need not to use expensive instruments such as x-ray emitter, reduction detection device's that can be great cost.

The application has the advantages that: the application provides a detection tool and kneel needle detection method, detection tool includes tool main part, test needle and locating plate that are parallel to each other, all be equipped with the pinhole with the regional diaphragm orifice one-to-one that awaits measuring of circuit board on tool main part and the locating plate, the setting of test needle one-to-one in the pinhole of tool main part and locating plate to can follow the pinhole and slide, the locating plate with tool main part interval sets up and sliding connection, the inside location elastic component of tool main part makes the test needle has decurrent thrust, ensures with the good contact of connector needle tail. The application test fixture simple structure, only can respond out the emergence whether have the needle phenomenon of kneeling through the difference in height of test needle terminal surface, the analysis of testing result is directly perceived quick, and need not to use expensive instruments such as x-ray emitter, reduction detection device's that can be great cost.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic view of the kneeling needle phenomenon described in the background of the present application;

fig. 2 is a schematic diagram illustrating a state of the detection jig according to the embodiment of the present application before the detection is started;

fig. 3 is a schematic diagram illustrating a state of the detection fixture in the detection process according to the embodiment of the application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

As shown in fig. 1, 2 and 3, a detection jig includes:

the jig comprises a jig main body 1, wherein a first pin hole 11 and an elastic piece cavity 12 are arranged on the jig main body 1, the first pin hole 11 corresponds to a plate hole 41 of a region to be tested of a circuit board 4 in a one-to-one mode, the elastic piece cavity 12 is formed by radially extending the non-end part region of the first pin hole 11, and a first elastic piece 13 is arranged in the elastic piece cavity 12;

the testing needles 2 are parallel to each other, correspond to the first needle holes 11 one by one, and are connected with the first needle holes 11 in a sliding manner, and the lengths of the testing needles 2 are equal; the test needle 2 is provided with a first blocking part 12, the first blocking part 12 is blocked at the lower end of the elastic part cavity 12, the first elastic part 13 is sleeved on the test needle 2, and two ends of the first elastic part are limited by the top of the elastic part cavity 12 and the first blocking part 12 respectively;

the positioning plate 3 is provided with second pin holes 31 which correspond to the first pin holes 11 one by one, and the test pin 2 is connected with the second pin holes 31 in a sliding manner; the positioning plate 3 and the jig main body 1 are arranged at intervals, the positioning plate 3 is provided with a connecting rod 32 parallel to the test needle 2, the lower end of the connecting rod 32 is fixedly connected with the guide plate, the upper end of the connecting rod is connected with the jig main body 1 in a sliding manner, the connecting rod 32 is provided with a second blocking part 33, and the lower surface of the second blocking part 33 is blocked by the jig main body 1, so that the lower end of the test needle 2 extends out of the positioning plate 3 at equal distances.

First card fender portion 12, elastic component chamber 12, first elastic component 13 and the cooperation of testing needle 2, first elastic component 13 makes testing needle 2 have decurrent thrust because of the elasticity that deformation produced, ensures that the lower extreme of testing needle 2 keeps in contact with the backshank 51 of connector 5, and after the test is accomplished, also can make the both ends of being tested needle 2 reset. Connecting rod 32, second card portion 33, locating plate 3 and tool main part 1's cooperation makes the deflector with tool main part 1 spaced sliding connection, the lower extreme of test pin 2 stretches out the isometric distance of locating plate 3 makes each test pin 2 can be quick with the cooperation of the diaphragm orifice 41 one-to-one in the region that awaits measuring of circuit board 4, connecting rod 32 still has the effect of direction, makes the probe pin can perpendicular to circuit board 4. Wherein, one-to-one correspondence means that the number and the arrangement order are consistent.

If the pin kneeling occurs, the pin 51 of the connector 5 is not properly and completely pressed into the corresponding board hole 41 of the circuit board 4, and the pin 51 of the connector 5 is broken, bent or twisted, so that the height difference of the pin 51 is obviously changed. In addition, since the hole diameter of the plate hole 41 of the circuit board 4 is small, sufficient light cannot pass through, and the plate hole is dark and cannot be observed with the naked eye. This application is isometric through setting up test needle 2, before the detection begins, the upper end and the lower extreme of each test needle 2 all keep in the coplanar, then stretch into circuit board 4 with each test needle 2 and await measuring regional plate hole 41, each test needle 2 the lower extreme with stop motion behind connector 5's the contact of needle tail 51, at this moment, the both ends of test needle 2 can demonstrate the difference in height unanimous with connector 5's needle tail 51 behind the crimping, and whether the upper end through observing each test needle 2 is in same plane, whether the analysis that can be quick has the emergence of the needle phenomenon of kneeling. The application test fixture simple structure, only can respond out the emergence whether have the needle phenomenon of kneeling through the difference in height of 2 terminal surfaces of test needle, the analysis of testing result is directly perceived quick, and need not to use expensive instruments such as x-ray emitter, reduction detection device's that can be great cost.

The testing needle 2 can still accurately extend into the plate hole 41 corresponding to the region to be detected of the corresponding circuit board 4 within a certain error range, in some embodiments of the present application, the lower end of the testing needle 2 can be set to be in a shape that decreases from large to small, especially a hemispherical shape or a conical shape, and the effect is the best.

The quantity of connecting rod 32 can be selected according to the size of locating plate 3 when the area of locating plate 3 is great, can set up more figure, generally, connecting rod 32 can set up to two, can make locating plate 3's connection with fix a position well, and simple structure.

In order to make the processing technology of the jig main body 1 simpler, we set the jig main body 1 to be a split structure, for example, in some embodiments of the present application, the jig main body 1 includes an upper press plate, a tubular plate and a lower press plate which are sequentially connected from top to bottom, the upper press plate and the lower press plate are provided with first pinholes 11 corresponding to each other, and the tubular plate is provided with an elastic member cavity 12 corresponding to the first pinholes 11. The multi-layer split structure is processed respectively and then connected, so that the processing technology is simpler.

For the convenience of observation, in some embodiments of the present application, the fixture body 1 may further include an observation plate, the observation plate is disposed at the upper end of the upper pressing plate and is fixedly connected to the upper pressing plate, and the observation plate is provided with corresponding first pinholes 11.

In order to adjust the thickness of tool main part 1, in the partial embodiment of this application, tool main part 1 includes the connecting plate, the connecting plate sets up the lower extreme of holding down plate, with the holding down plate concreties, be equipped with corresponding first pinhole 11 on the observation board.

In addition, in order to facilitate power input, a power input structure matched with a driving mechanism can be arranged on one or more of the upper pressing plate, the spring plate, the lower pressing plate and the connecting plate, and the driving mechanism can be an air cylinder, an oil cylinder or a mechanical arm and can also be manually operated by an operator to provide power. For example, when power is provided by manual operation of an operator, the opposite side surfaces on one or more of the upper pressure plate, the spring plate, the lower pressure plate and the connecting plate are extended to form handles for facilitating hand holding.

In order to facilitate the installation of the connecting rod 32, in some embodiments of the present application, an upper side ear is disposed on the opposite side of the upper pressing plate, a lower side ear corresponding to the upper side ear is disposed on the connecting plate, the upper end of the connecting rod 32 passes through the lower side ear and the upper side ear and is slidably connected with the side ear, the lower surface of the second blocking portion 33 is blocked by the upper surface of the lower side ear, the connecting rod 32 is further provided with a second elastic member 34, and two ends of the second elastic member 34 are respectively blocked by the upper side ear and the second blocking portion 33. The second elastic element 34 can be better restored to the original position by the elastic force generated by the second deformation. In addition, the connecting bar 32 also has a guiding function, so that the probe pin can be perpendicular to the circuit board 4.

In the embodiment of the present application, the number of the test pins 2 is preferably set to 50 to 150. When the number of the test needles 2 is in the range of 50-150, both the efficiency and the accuracy can be optimized.

In the embodiment of the present application, the diameter of the test needle 2 is preferably 0.2 to 1 mm. Particularly, when the diameter of the test needle 2 is not more than 0.5mm, the test needle 2 can be positioned better and can extend into the plate hole 41 of the area to be detected of the circuit board 4 more quickly and accurately.

In order to make the lower end of the test needle 2 more easily extend into the plate hole 41 of the area to be detected of the circuit board 4, the distance that the lower end of the test needle 2 extends out of the positioning plate 3 is preferably kept between 0.5mm and 1 mm.

The blocking part is used for forming a step, forms a supporting part for providing blocking, can be arranged in various forms, the first blocking part 12 and the probe can be arranged in an integrally formed structure and can also be arranged in a detachable connection structure, and similarly, the second blocking part 33 and the guide rod can also be arranged in an integrally formed structure or a detachable connection structure. The shape of the engaging portion may be changed adaptively as necessary, and may be provided in a shape of a raised ring or a stepped shape, for example.

The elastic members may be selected according to the distance of the axial movement and the magnitude of the preset elastic force, in some embodiments of the present application, the first elastic member 13 is a compression spring, the second elastic member 34 is a compression spring, and in other embodiments of the present application, the elastic members may be spring plates or blocks made of elastic materials.

The application also provides a kneeling needle detection method, which is used for the detection jig, and is characterized by comprising the following steps:

s1, after the area to be tested of the circuit board 4 is connected with the connector 5, the lower end of the test needle 2 extends into the plate hole 41 in a one-to-one correspondence manner with the plate hole 41 of the area to be tested of the circuit board 4 from the direction opposite to the connection direction, and the guide plate is attached to the surface of the circuit board 4;

s2, driving the jig main body 1 to move downwards, and enabling each test pin 2 to extend into the bottom of the corresponding plate hole 41 and to be in contact with the pin tail 51 of the connector 5;

s3, observing the upper ends of the test needles 2, and if the upper ends of the test needles 2 are flush, avoiding the kneeling needle phenomenon; if the upper ends of the test needles 2 have height differences, kneeling needles are arranged in the area to be tested of the circuit board 4.

Before the detection starts, the upper end and the lower end of each test needle 2 are kept in the same plane, then each test needle 2 extends into a plate hole 41 of a region to be detected of the circuit board 4, the lower end of each test needle 2 is contacted with a needle tail 51 of the connector 5 and then stops moving, at the moment, the two ends of each test needle 2 can present a height difference consistent with the needle tail 51 of the connector 5 after compression joint, and whether kneeling needle phenomenon occurs or not can be rapidly analyzed by observing whether the upper end of each test needle 2 is in the same plane or not. The application test fixture simple structure, only can respond out the emergence whether have the needle phenomenon of kneeling through the difference in height of 2 terminal surfaces of test needle, the analysis of testing result is directly perceived quick, and need not to use expensive instruments such as x-ray emitter, reduction detection device's that can be great cost.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present disclosure should be covered within the scope of the present application.

Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.