CN211785793U

CN211785793U - Tool for testing indirect electric resistance between contact pin and PCB

Info

Publication number: CN211785793U
Application number: CN201922230591.2U
Authority: CN
Inventors: 秦佳; 张勇; 郑伟
Original assignee: Wuxi Jewel Technology Co ltd
Current assignee: Wuxi Jewel Technology Co ltd
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2020-10-27
Anticipated expiration: 2029-12-13

Abstract

The utility model discloses a test contact pin and indirect frock of electrocuting resistance of PCB, including bottom plate, foraminiferous metal block, dowel, linear guide, sliding bottom plate, fixed plate, pin, probe subassembly I, probe subassembly II includes main part, screw hole board, front bezel, spanner, fixed plate, linear guide II, pin and probe syringe needle respectively. The utility model provides a test fixture, through this frock and the special instrument of measurement contact resistance, can be stable, accurately measure the contact resistance between contact pin and the PCB who inserts in the PCB, solved and unable fixed after the past contact pin inserts the PCB, the contact pin easily drops, and the measuring instrument probe can't guarantee to contact the difficult department of the constant pressure of the body under test, has improved measuring accuracy and stability greatly.

Description

Tool for testing indirect electric resistance between contact pin and PCB

Technical Field

The utility model belongs to the technical field of the test fixture, especially, frock of electric shock resistance between test contact pin and PCB.

Background

After the pin is inserted into the PCB, the bonding strength between the pin and the PCB is highly required because of the non-soldering specificity, and the contact resistance must be measured to prevent the overall mechanical and electrical performance from being deteriorated due to the excessive contact resistance. The contact resistance is mainly influenced by the contact material, positive pressure, surface state, applied voltage and current, etc. The common measurement method is only to fix the PCB body, and the probes are used for touching the two pin ends of the contact pins to measure the contact resistance, so that the positive pressure cannot be ensured, the measurement result error is large, and 36 contact pins are simultaneously inserted into one PCB, so that the test efficiency is very low. And if the fixture is adopted for clamping, the constant positive pressure can be ensured, meanwhile, the bonding strength between the contact pin and the PCB can not be influenced, various different measurement modes can be tried to reduce the error to the minimum, and the measurement efficiency can be greatly improved.

SUMMERY OF THE UTILITY MODEL

The invention aims to solve the problems and design a tool to accurately measure the contact resistance between a contact pin and a PCB on the premise of ensuring the contact pin and the PCB to be intact.

The utility model aims at adopting the following technical scheme to realize, a frock of indirect electric shock resistance of test contact pin and PCB, including bottom plate, foraminiferous metal block, dowel pin, linear guide, sliding bottom plate, fixed plate, pin, probe subassembly I, probe subassembly II, linear guide fixes on the bottom plate, the sliding bottom plate bottom is equipped with the spout and can slides along linear guide, the fixed vertical fixed plate that is equipped with on the sliding bottom plate, the fixed plate is L-shaped, PCB fixes on the fixed plate through upper and lower two fastening pins; the metal blocks with holes are fixedly arranged on the bottom plate and are parallel to the linear guide rail, and round holes are longitudinally arranged on the metal blocks with holes; the sliding bottom plate left side is located foraminiferous metal block, and sliding bottom plate left side tip is equipped with the round hole, and round hole is fixed with sliding bottom plate about the shop bolt passes, mentions the shop bolt, and sliding bottom plate can freely slide along linear guide I.

Preferably, the probe assembly I and the probe assembly II respectively comprise a main body, a screw hole plate, a front plate, a wrench, a fixing plate, a linear guide rail II, a pin and a probe needle head, wherein the linear guide rail II is fixedly arranged on the main body, a sliding groove is formed in the back of the screw hole plate and can slide along the linear guide rail II, the front plate can slide up and down relative to the screw hole plate, and the front of the front plate is provided with the pin capable of pulling the front plate; the wrench comprises a fixing piece, a rotating shaft and a rotating hand, wherein the fixing piece is fixed at the left end of the fixing plate, the rotating shaft is arranged on the fixing piece, and the rotating hand of the wrench can rotate relative to the rotating shaft; the right side of the lower part of the screw hole plate is fixedly provided with a horizontal push rod, the right end of the push rod is connected in the middle of a rotating hand through a connecting rod, and the rotating hand can drive the screw hole plate to move along the direction of the II X axis of the linear guide rail.

The utility model provides a test fixture, through this frock and the special instrument of measurement contact resistance, can be stable, accurately measure the contact resistance between contact pin and the PCB who inserts in the PCB, solved and unable fixed after the past contact pin inserts the PCB, the contact pin easily drops, and the measuring instrument probe can't guarantee to contact the difficult department of the constant pressure of the body under test, has improved measuring accuracy and stability greatly.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings.

FIG. 1 is a schematic structural view of the fixture for testing the indirect contact resistance between the contact pin and the PCB of the present invention;

FIG. 2 is a front view of the probe assembly.

Fig. 3 is a perspective view of the probe assembly.

In the figure, 1, a base plate, 2, a metal block with holes, 3, a positioning pin, 4, a linear guide rail, 5, a sliding base plate, 6, a fixing plate, 7, a fastening pin, 8, a probe assembly I, 9, a probe assembly II, 11, a main body, 12, a screw hole plate, 13, a front plate, 14, a spanner, 15, a fixing plate, 16, a linear guide rail II, 17, a pin and 18 probe needles.

Detailed Description

As shown in fig. 1, the tooling component includes: the probe comprises a base plate 1, a metal block 2 with holes, a positioning pin 3, a linear guide rail 4, a sliding base plate 5, a fixing plate 6, a pin 7, a probe assembly I8 and a probe assembly II 9; the linear guide rail is fixedly arranged on the bottom plate, the bottom of the sliding bottom plate 5 is provided with a sliding chute which can slide along the linear guide rail 4, the sliding bottom plate 5 is fixedly provided with a vertical fixing plate 6, the fixing plate 6 is L-shaped, and the PCB is fixed on the fixing plate 6 through an upper fastening pin and a lower fastening pin; foraminiferous metal block 2 is fixed to be located on bottom plate 1, and is parallel with linear guide, and longitudinal arrangement is equipped with the round hole on foraminiferous metal block 2, and 5 left sides of sliding bottom plate are located foraminiferous metal block 2 above, and 5 left side tip of sliding bottom plate are equipped with the round hole, and the round hole is fixed with sliding bottom plate 5 about the shop bolt passes, mentions the shop bolt, and sliding bottom plate can freely slide along linear guide I4.

The contact pin is inserted into the PCB, the PCB is fixed on the tool through the fastening pin 7 by the two through holes, the sliding bottom plate 5 and the fixing plate 6 form a system capable of moving in the Z-axis direction, the PCB can move in the Z-axis direction, and the system is used for measuring different contact pins on the Z-axis position of the PCB so as to select an area needing to be measured. Probe subassembly I8 and probe subassembly II 9 are used for contacting the needle point and the backshank both ends of contact pin, and two probe subassemblies pass through hexagonal screw fixation on the frock, and the below is furnished with linear guide, can remove in X axle direction to this pressure to the contact pin of controlling, increase or reduce pressure according to actual conditions. The two probe assemblies can be adjusted up and down with the pins to measure different pins in the same area.

The specific working principle of the probe assembly I8 and the probe assembly II 9 is shown in figures 2 and 3.

The probe assembly includes: the device comprises a main body 11, a screw hole plate 12, a front plate 13, a wrench 14, a fixing plate 15, a linear guide rail II 16, a pin 17 and a probe needle 18. The linear guide rail II 16 is fixedly arranged on the main body 11, a sliding groove is arranged behind the screw hole plate 12 and can slide along the linear guide rail II, the front plate 13 can slide up and down relative to the screw hole plate 12, and a pin 7 capable of pulling the front plate is arranged in front of the front plate; a fixing piece of the wrench is fixed at the lower part of the left end of the fixing plate, a rotating shaft is arranged on the fixing piece, and a rotating handle of the wrench can rotate relative to the rotating shaft; the right side of the lower part of the screw hole plate 12 is fixedly provided with a horizontal push rod, the right end of the push rod is connected in the middle of a rotating hand through a connecting rod, the rotating hand can be rotated to drive the screw hole plate 12 to move along the direction of the II X axis of the linear guide rail, the position of a wrench is fixed, and the pressure of a probe needle head is fixed.

The probe tip 18 is used to contact the pin tip and the pin tail. The pin 17 and the front plate 13 form a module capable of moving in the Y-axis direction, and pins at different positions in the same area can be measured. The wrench 14, the fixing plate 15 and the linear guide rail II 16 form a module for keeping constant pressure.

After the PCB is installed in the tool, the probes on the tool are adjusted to proper positions, the lead of the special contact resistance measuring instrument is connected to the two probes, the total resistance between the contact pin and the PCB can be measured, and the resistance values of the contact pin and the PCB are subtracted to obtain the contact resistance. In order to improve the measurement accuracy, a copper wire can be connected between the two contact pins, the internal resistance of the loop is measured, and then the resistance of the contact pins, the resistance of the PCB and the internal resistance of the loop are subtracted according to a conventional measurement mode to obtain the contact resistance. The PCB can move longitudinally on the tool, the probe module can move transversely and longitudinally in two directions, and the second contact pin can be quickly and accurately positioned to continue to be measured after the first contact resistance is measured.

Experiments prove that the contact resistance can be quickly and accurately measured by using the tool, the data consistency is good, and the working efficiency in actual production is greatly improved.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A tool for testing indirect electric shock resistance of a contact pin and a PCB is characterized by comprising a base plate, a metal block with holes, a positioning pin, a linear guide rail, a sliding base plate, a fixing plate, a pin, a probe assembly I and a probe assembly II, wherein the linear guide rail is fixedly arranged on the base plate, a sliding chute is formed in the bottom of the sliding base plate and can slide along the linear guide rail, a vertical fixing plate is fixedly arranged on a sliding base plate, the fixing plate is L-shaped, and the PCB is fixedly arranged on the fixing plate through an upper fastening pin and a lower fastening pin; the metal blocks with holes are fixedly arranged on the bottom plate and are parallel to the linear guide rail, and round holes are longitudinally arranged on the metal blocks with holes; the sliding bottom plate left side is located foraminiferous metal block, and sliding bottom plate left side tip is equipped with the round hole, and round hole is fixed with sliding bottom plate about the shop bolt passes, mentions the shop bolt, and sliding bottom plate can freely slide along linear guide I.

2. The tool for testing the contact resistance between the contact pin and the PCB as claimed in claim 1, wherein the probe assembly I and the probe assembly II respectively comprise a main body, a screw hole plate, a front plate, a wrench, a fixing plate, a linear guide rail II, a pin and a probe needle head, the linear guide rail II is fixedly arranged on the main body, a sliding groove is arranged at the back of the screw hole plate and can slide along the linear guide rail II, the front plate can slide up and down relative to the screw hole plate, and the pin capable of pulling the front plate is arranged in front of the front plate; the wrench comprises a fixing piece, a rotating shaft and a rotating hand, wherein the fixing piece is fixed at the left end of the fixing plate, the rotating shaft is arranged on the fixing piece, and the rotating hand of the wrench can rotate relative to the rotating shaft; the right side of the lower part of the screw hole plate is fixedly provided with a horizontal push rod, the right end of the push rod is connected in the middle of the rotating hand through a connecting rod, and the rotating hand can drive the screw hole plate to move along the horizontal direction of the linear guide rail II.