CN220509033U

CN220509033U - Impedance test fixture

Info

Publication number: CN220509033U
Application number: CN202321681875.3U
Authority: CN
Inventors: 龚健
Original assignee: Hefei Yulong Photoelectric Technology Co ltd
Current assignee: Hefei Yulong Photoelectric Technology Co ltd
Priority date: 2023-06-29
Filing date: 2023-06-29
Publication date: 2024-02-20
Anticipated expiration: 2033-06-29

Abstract

The utility model relates to the technical field of PCB detection devices, and particularly discloses an impedance test fixture which comprises a test instrument, a support frame, an air cylinder, a workbench and a dial, wherein the support frame is arranged on the support frame; the lower end of the supporting frame is connected with the workbench, and the upper end of the supporting frame is fixedly connected with the air cylinder; the cylinder output shaft is equipped with the connecting plate, and the connecting plate lower extreme is connected with the dial, and the workstation is located dial below and workstation upper end is equipped with the standing groove that is used for placing the PCB, and the dial is connected with the test instrument electricity. The impedance test jig adopting the scheme can solve the problems of low efficiency and easiness in causing scratches of the PCB caused by the impedance of the manual test PCB in the prior art.

Description

Impedance test fixture

Technical Field

The utility model belongs to the technical field of PCB detection devices, and particularly discloses an impedance test fixture.

Background

PCB (Printed Circuit Board), also called a printed circuit board, is an important support for electronic components, is widely used as a carrier for electronic components with high-tech added value, and as 3G, 4G or even 5G networks are popularized, many electronic products have higher and higher requirements on impedance precision control in the printed circuit board, so that the impedance of the PCB needs to be measured.

Some of the existing impedance test measurement is to manually measure the impedance value through a universal meter, the test point needs to be found, and as the pen point of the meter is in poor contact at the uneven force application position of the test point, the stability of the test value is affected, scratches on the PCB test point can be caused by excessive force application, and the manual measurement efficiency is low.

Disclosure of Invention

The utility model aims to provide an impedance test fixture for solving the problems of low efficiency and easiness in causing scratches of a PCB caused by manually testing the impedance of the PCB in the prior art.

In order to achieve the above object, the basic scheme of the present utility model is as follows: the impedance test fixture comprises a test instrument, a support frame, an air cylinder, a workbench and a dial; the lower end of the supporting frame is connected with the workbench, and the upper end of the supporting frame is fixedly connected with the air cylinder; the cylinder output shaft is equipped with the connecting plate, and the connecting plate lower extreme is connected with the dial, and the workstation is located dial below and workstation upper end is equipped with the standing groove that is used for placing the PCB, and the dial is connected with the test instrument electricity.

The working principle and beneficial effects of the basic scheme are that: when the impedance test jig of the scheme is adopted, the PCB to be tested is placed in the placing groove, so that the PCB can be initially fixed. And the cylinder is started to drive the connecting plate to move downwards, and the needle dial connected with the connecting plate moves downwards along with the connecting rod until the needle dial contacts with the detection point of the PCB. Also, because the dial is connected to the test instrument, a loop is formed between the dial and the test instrument when the dial contacts the PCB, so that the impedance of the PCB contact point is detected and displayed on the test instrument. The staff can know the impedance value of the PCB to be tested. Then the cylinder drives the dial to move upwards, and the PCB in the placing groove can be taken out to carry out impedance detection on the next PCB.

By adopting the impedance test fixture, the manual holding of the test instrument is not needed for detection, so that the labor is saved, and the working efficiency is improved. Moreover, the needle disc is driven to move through the air cylinder, namely, the moving route of the needle disc is a vertical straight line, the needle disc cannot contact with other places of the PCB, and scratches on the PCB are avoided.

Further, the number of needle trays is four. The number of the needle discs is four, so that the impedance of a plurality of PCBs can be tested at one time, and the working efficiency is improved.

Further, the four needle plates are arranged in a step shape along the connecting plate. The four needle plates are arranged in a step shape along the connecting plate, so that the needle plates are convenient to take, and the damage to the PCB caused by contact between the needle plates and other parts of other PCBs during testing can be avoided.

Further, a placing plate is arranged at the upper end of the workbench, and a placing groove is formed in the place of the placing plate; the upper end of the workbench is provided with a groove, and the placing plate is detachably connected with the groove. For PCBs of different models, placing grooves of different models can be formed in the placing plate. When detecting PCBs of different models, the placing plate is replaced. Thus, detection of PCBs of different models can be realized.

Further, the connecting plate is detachably connected with the needle disc, and the connecting plate is detachably connected with the output shaft of the air cylinder. When aiming at PCBs of different models, the connecting plate or the dial can be replaced, so that impedance tests can be carried out on PCBs of different models.

Further, the engine control device further comprises a controller, and the controller is electrically connected with the air cylinder.

Drawings

FIG. 1 is a front view of an impedance testing fixture according to the present utility model;

FIG. 2 is a cross-sectional view of a table in an impedance test fixture according to the present utility model;

fig. 3 is a schematic structural diagram of an impedance testing jig placing plate according to the present utility model.

Detailed Description

The following is a further detailed description of the embodiments:

reference numerals in the drawings of the specification include: the device comprises a workbench 1, a support frame 2, an ohmmeter 3, a placing plate 4, a controller 5, an air cylinder 6, a connecting plate 7, a dial 8, a groove 9, a placing groove 10 and a connecting frame 11.

The embodiment is basically as shown in fig. 1-3, and an impedance testing jig includes a testing instrument, where the testing instrument in the embodiment adopts an ohmmeter 3. The impedance testing jig in this embodiment further includes a supporting frame 2, a connecting frame 11, an air cylinder 6, a workbench 1 and a dial 8. The lower end of the connecting frame 11 is connected with the workbench 1 through screws, and the ohmmeter 3 is connected with the upper end of the connecting frame 11. The lower end of the supporting frame 2 is connected with the workbench 1 through a screw, the upper end of the supporting frame 2 is fixedly connected with the air cylinder 6, and the connection mode can adopt a bolt connection mode. The output shaft of the air cylinder 6 is provided with a connecting plate 7, the connecting plate 7 is detachably connected with the output shaft of the air cylinder 6, and the connecting mode can be in bolted connection. The lower end of the connecting plate 7 is connected with the needle dial 8 in a detachable way, and the connecting mode can be connected by bolts. The dial 8 is electrically connected to the test instrument. The impedance test fixture in this embodiment further includes a controller 5, and the controller 5 is electrically connected with the cylinder 6. The controller 5, the air cylinder 6 and the ohmmeter 3 in this embodiment are all in the prior art, and those skilled in the art know the specific model, structure and connection mode thereof, and can select and connect appropriate components as required.

In this embodiment, the number of the needle trays 8 is four, and the lower end of each needle tray 8 is provided with a probe. The four needle trays 8 are arranged in a step along the connecting plate 7.

The workbench 1 is positioned below the dial 8, a placing groove 10 for placing a PCB is formed in the upper end of the workbench 1, a placing plate 4 is arranged at the upper end of the workbench 1, and the placing groove 10 is formed in the place of the placing plate 4; the upper end of the workbench 1 is provided with a groove 9, the longitudinal section of the groove 9 is in an inverted trapezoid shape, and the lower end of the placing plate 4 can be placed in the groove 9.

The specific implementation mode is as follows: when the impedance test fixture of the embodiment is adopted, the PCB to be tested is firstly placed in the placing groove 10, so that the PCB can be initially fixed. The controller 5 is then activated, and the controller 5 controls the activation of the cylinder 6. The output shaft of the cylinder 6 extends out and drives the connection plate 7 to move downwards, and the dial 8 connected with the connection plate 7 moves downwards together with the connection rod until the probe of the dial 8 is stopped briefly for a few seconds after it comes into contact with the detection point of the PCB. Also because the dial 8 is connected to the test instrument, the probes of the dial 8, when in contact with the PCB, form a loop with the test instrument to detect the impedance of the PCB contact and display it on the ohmmeter 3. The staff can know the impedance value of the PCB to be tested. Then the controller 5 controls the air cylinder 6 to drive the dial 8 to move upwards, and the PCB in the placing groove 10 can be taken out to carry out impedance detection on the next PCB.

The detected positions are fixed for the same type of PCB. The placement groove 10 is configured such that the inspection point position of each PCB is fixed after the PCB is placed in the placement groove 10. When the cylinder 6 drives the dial 8 to move downwards, the probe can just contact with the monitoring point and detect impedance, and the working efficiency can be greatly improved. Different types of placement slots 10 may be provided at the placement plate 4 for different types of PCBs. When detecting PCBs of different models, the placement plate 4 is replaced. Thus, detection of PCBs of different models can be realized. Meanwhile, when the PCB with different types is used, the connecting plate 7 or the needle dial 8 can be replaced, and the position of the probe is changed, so that the probe is always opposite to the detection point, and the impedance test can be performed on the PCB with different types.

By adopting the impedance test fixture of the embodiment, the manual holding of the test instrument for detection is not needed, so that the labor is saved, and the working efficiency is improved. Moreover, the needle dial 8 is driven to move through the air cylinder 6, namely, the moving route of the needle dial 8 is a vertical straight line, so that the needle dial 8 cannot contact with other places of the PCB, and scratches on the PCB are avoided.

The foregoing is merely exemplary of the present utility model and the specific structures and/or characteristics of the present utility model that are well known in the art have not been described in detail herein. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present utility model, and these should also be considered as the scope of the present utility model, which does not affect the effect of the implementation of the present utility model and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.

Claims

1. The utility model provides an impedance test tool, includes test instrument, its characterized in that: the device also comprises a supporting frame (2), an air cylinder (6), a workbench (1) and a needle dial (8); the lower end of the supporting frame (2) is connected with the workbench (1), and the upper end is fixedly connected with the air cylinder (6); the output shaft of the air cylinder (6) is provided with a connecting plate (7), the lower end of the connecting plate (7) is connected with a needle dial (8), the workbench (1) is positioned below the needle dial (8), the upper end of the workbench (1) is provided with a placing groove (10) for placing a PCB, and the needle dial (8) is electrically connected with a testing instrument; the number of the needle discs (8) is four; the four needle plates (8) are arranged in a step shape along the connecting plate (7); the upper end of the workbench (1) is provided with a placing plate (4), and the placing groove (10) is arranged at the place of the placing plate (4); the upper end of the workbench (1) is provided with a groove (9), and the placing plate (4) is detachably connected with the groove (9); the device also comprises a controller (5), wherein the controller (5) is electrically connected with the air cylinder (6); the test instrument is an ohmmeter.

2. The impedance testing jig of claim 1, wherein: the connecting plate (7) is detachably connected with the needle dial (8), and the connecting plate (7) is detachably connected with the output shaft of the air cylinder (6).