CN205120829U - Little resistance test device - Google Patents

Abstract

The utility model discloses a micro-resistance testing device, which is used for testing the micro-resistance of a circuit board. The micro-resistance device includes a testing mechanism, a driving mechanism and a control mechanism. The testing mechanism includes a base, a workbench, and a testing fixture , a test module and a charge-coupled image sensor, the workbench includes a lower fixed table and an upper fixed table, the test fixture includes a lower fixture and an upper fixture, the upper fixture is set relative to the lower fixture, and the The lower fixture is used to clamp the circuit board, the test module is clamped between the upper fixed table and the lower fixed table, the test module is provided with a test probe, and the test probe contacts the circuit board The micro-resistor of the charge coupling monitors the position information of the circuit board, the driving mechanism drives the sliding of the lower fixed table, the control mechanism controls the operation of the driving mechanism, and controls the micro-circuit board of the test module to test resistance.

Description

Micro resistance test device

technical field

The utility model relates to the field of circuit board resistance testing, in particular to a micro-resistance testing device.

Background technique

As we all know, all electronic and electrical equipment or control systems must use printed circuit boards. In order to ensure that the circuit boards do not have open circuits or short circuits, printed circuit boards must pass the test of the PCB testing machine before shipment, and unqualified circuit boards Check out.

With the rapid development of electronic technology, the number of layers of printed circuit boards (PCBs) is getting higher and higher, the circuit density is getting denser, and the pad size is getting smaller and smaller. Customers have stricter requirements for boards, especially It is the safety and stability of PCB, such as automobile boards that are related to life safety, and aerospace control system electronic boards that are concerned with national defense. Ordinary two-terminal testing machines usually use the disconnection test method, which is based on the known cable impedance, electronic control impedance, and contact impedance plus the impedance of the PCB under test, so it is impossible to measure the true value of the PCB under test. Impedance, so that small defects in the hole and small gaps in the circuit cannot be detected. When the line resistance is less than 20Ω, it has basically become its test blind area. In actual production, it is found that some defects of PCB, such as no copper in the hole, void, thin copper, thin line, line gap, etc., will affect the line resistance. When the resistance is less than 20Ω, the test result shows PASS, but the customer After high-temperature welding, the resistance value changes, resulting in an open circuit problem, which eventually leads to customer complaints, and in serious cases, compensation must be paid to the customer.

The existing printed circuit board testing machines mainly include the following types: double-density, quadruple-density, and six-fold-density general-purpose two-wire testing machines, which are mainly used for testing ordinary circuit boards; four-wire flying probe testing machines are mainly used for It is suitable for small resistance PCB testing, but it is generally only used for sample testing, and it is difficult to meet the needs of batch board testing.

Utility model content

The purpose of the utility model is to provide a micro-resistance testing device which improves testing efficiency.

In order to solve the above technical problems, the utility model provides a micro-resistance testing device for testing the micro-resistance of a circuit board, wherein the micro-resistance device includes a testing mechanism, a driving mechanism and a control mechanism, and the testing mechanism includes a basic seat, workbench, test fixture, test module and charge-coupled image sensor, the workbench includes a lower fixed platform mounted on the base and an upper fixed platform slidably arranged relative to the lower fixed platform, The test fixture includes a lower fixture fixed on the lower fixed platform and an upper fixture fixed on the upper fixed platform, the upper fixture is arranged relative to the lower fixture, and the lower fixture is used to clamp the circuit plate, the test module is clamped between the upper fixed table and the lower fixed table, the test module is provided with a test probe and a test circuit connected to the test probe, and the test probe is used for The upper fixture and the lower fixture contact the micro-resistance on the circuit board when they are close together, and the charge-coupled image sensor is fixed between the upper fixture and the lower fixture for monitoring the position of the circuit board information, the drive mechanism drives the lower fixed table to slide, the control mechanism is electrically connected to the drive mechanism and the test module to control the operation of the drive mechanism, and controls the test module to test the circuit board microresistor.

Wherein, the micro-resistance testing device also includes a feeding mechanism, the feeding mechanism includes a feeding frame and a feeding table that is slidably connected to the feeding frame, and the feeding frame is fixed on one side of the base , the feeding table is used to place the circuit board to the lower fixture, and the driving mechanism also drives the feeding table to slide.

Wherein, the feeding mechanism also includes a first vertical transmission shaft fixed to the feeding frame and a first horizontal transmission shaft slidingly connected to the first vertical transmission shaft, and the first horizontal transmission shaft is along the The vertical direction is slidably disposed on the first vertical transmission shaft, and the feed table is slidably disposed on the first horizontal transmission shaft along the horizontal direction.

Wherein, the micro-resistance testing device also includes a discharge mechanism, the discharge mechanism includes a discharge frame and a discharge platform that is slidably connected to the discharge frame, and the discharge frame is fixed on the base relative to the On the other side of the feeding rack, the discharging platform is used to take out the circuit board from the lower fixture, and the driving mechanism also drives the discharging platform to slide.

Wherein, the discharge mechanism also includes a second vertical transmission shaft fixed to the discharge frame and a second horizontal transmission shaft slidingly connected to the second vertical transmission shaft, and the second horizontal transmission shaft is along the The vertical direction is slidably disposed on the second vertical transmission shaft, and the discharge platform is slidably disposed on the second horizontal transmission shaft along the horizontal direction.

Wherein, the micro-resistance testing device further includes a fine-tuning mechanism, and the fine-tuning mechanism is installed on the base to adjust the horizontal position of the upper fixed platform or/and the lower fixed platform.

Wherein, the fine-tuning mechanism includes an upper adjustment assembly and a lower adjustment assembly, the upper adjustment assembly is installed on the base to adjust the front and rear, left and right, and rotation angle positions of the upper fixed table, and the lower adjustment assembly Installed on the base, it is used to adjust the front and rear, left and right and rotation angle positions of the lower fixed platform.

Wherein, the control mechanism includes a display and an operation keyboard, the display is fixed on the base, electrically connected to the test module, and used to display the test information of the test module, and the operation keyboard is fixed on the The base is electrically connected to the test module for inputting test instructions to the test module.

Wherein, the control mechanism further includes a control processor electrically connected to the display and the operation keyboard, and the control processor is a computer.

Wherein, the driving mechanism is a motor.

The micro-resistance testing device of the present utility model comprises a lower clamp fixed on the lower fixed platform and an upper clamp fixed on the upper fixed platform through the test fixture, and the upper clamp is arranged relative to the lower clamp , the lower fixture is used to clamp the circuit board, the upper and lower fixed tables clamp the test module, the test module is provided with a test probe and a test circuit connected to the test probe, the test The probe is used to contact the micro-resistor on the circuit board when the upper fixture and the lower fixture are close together, and the charge-coupled image sensor is fixed between the upper fixture and the lower fixture for monitoring The location information of the circuit board, so as to realize the automatic test of the micro-resistance of the circuit board, so as to meet the test of the micro-resistance of the batch circuit board, thereby improving the efficiency of micro-resistance testing.

Description of drawings

In order to illustrate the technical solution of the utility model more clearly, the accompanying drawings that need to be used in the implementation will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some implementations of the utility model. Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is the schematic diagram of the micro-resistance testing device provided by the utility model;

FIG. 2 is an enlarged schematic view of part II of the micro-resistance testing device of FIG. 1 .

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention.

Please refer to FIG. 1 and FIG. 2 , a micro-resistance testing device 100 provided by an embodiment of the present invention. A micro-resistance testing device 100 provided in an embodiment of the present utility model. The micro-resistance testing device 100 includes a testing mechanism 10 , a driving mechanism 20 and a control mechanism 30 . The test mechanism 10 includes a base 11 , a workbench 12 , a test fixture 13 , a test module 14 and a charge-coupled image sensor (not shown). The workbench 12 includes an upper fixed platform 122 fixed on the base 11 and a lower fixed platform 121 slidably arranged relative to the upper fixed platform 122, and the test fixture 13 includes an upper fixed platform 121 fixed on the lower fixed platform 121. The upper lower clamp 131 and the upper clamp 132 fixed on the upper fixed platform 122 . The upper fixture 132 is arranged relative to the lower fixture 131, and the lower fixture 131 is used for clamping a circuit board (not shown), and the test is clamped between the upper fixing table 122 and the lower fixing table 121. Module 14. The test module 14 is provided with a test probe (not shown) and a test circuit (not shown) connected to the test probe, and the test probe is used to close the upper clamp 132 to the lower clamp 131 When touching the micro-resistor on the circuit board. The charge-coupled image sensor is fixed between the upper fixture 132 and the lower fixture 131 for monitoring the position information of the circuit board. The drive mechanism 20 drives the lower fixed table 121 to slide, and the control mechanism 30 is electrically connected to the drive mechanism 20 and the test module 14 to control the operation of the drive mechanism 20 and control the test module 14a Test the micro-resistance of the circuit board.

The lower fixture 131 is driven closer to the upper fixture 132 by the lower fixing table 121, thereby realizing that the test module 14 automatically contacts the circuit board on the lower fixture 131, thereby realizing automatic testing of micro-resistance, so as to satisfy The micro-resistance of batch circuit boards is tested, so that the micro-resistance testing device 100 improves testing efficiency.

In this embodiment, the base 11 is a box, the base 11 includes a bottom end 11a and a top end 11b oppositely arranged, the bottom end 11a is fixed on the ground, and the bottom end 11b is installed on the top end 11b. Fixed table 121. A transmission assembly (not shown) is arranged in the base 11 , and the transmission assembly transmits the driving force of the driving mechanism 20 to the lower fixed platform 121 to drive the lower fixed platform 121 to slide. In other embodiments, the base 11 may also be composed of multiple steel rods.

In this embodiment, the lower fixing platform 121 is a rectangular plate, the lower fixing platform 121 is slidably connected to the base 11, and the lower fixing platform 121 can slide along the horizontal plane on the base 11, The position of the lower fixing table 121 is adjusted to facilitate the adjustment of the position of the circuit board and improve the testing accuracy of the micro-resistance testing device 100 . A positioning groove (not shown) is provided on the side of the lower fixing table 121 facing away from the base 11 , and the positioning groove is used to fix the lower clamp 131 and lock the lower clamp 131 by screws. In other embodiments, the lower fixing platform 121 can also be provided with positioning pins, and the positioning pins can position the lower fixture 131, and the lower fixing platform 121 can also be provided with buckles to connect the lower fixture 131. Clamp 131 .

In this embodiment, the upper fixing platform 122 is a rectangular plate, and the upper fixture 132 is fixed on a side of the upper fixing platform 122 facing the lower fixing platform 121 . The upper fixing table 122 can also slide horizontally, so that the horizontal position of the upper fixing table 122 can be adjusted, so as to conveniently adjust the position of the upper clamp 132 to align with the position on the circuit board. The testing accuracy of the micro-resistance testing device 100 is improved. In other embodiments, the upper fixing platform 122 may also be connected to the upper clamp 132 by snap-fitting.

In this embodiment, the lower fixture 131 is detachably connected to the testing module 14 . The test module 14 is clamped by the lower fixing table 121 , so that the test module 14 can be easily disassembled and maintained, thereby improving the service life of the micro-resistance testing device 100 . Specifically, the lower fixing table 121 uses a support plate (not shown) and a U-shaped card box to clamp the test module 14 .

In this embodiment, the upper fixture 132 is detachably connected to the testing module 14 . The test module 14 is clamped by the upper fixing table 122 , so that the test module 14 can be easily disassembled and maintained, thereby improving the service life of the micro-resistance testing device 100 . Specifically, the upper fixing table 122 uses a support plate (not shown) and a U-shaped card box to clamp the test module 14 .

In this embodiment, the test module 14 includes a test circuit board 141 and a test dial 142 fixed on the test circuit board 141, the test circuit is arranged on the test circuit board 141, and the test circuit board Test line for 4-wire resistance. A plurality of probes are arrayed on the test dial 142 , and each probe is connected to the test circuit via a cable. The micro-resistance of any circuit structure on the circuit board can be quickly tested by using the testing module 14 , which improves the testing efficiency of the micro-resistance testing device 100 . In other actual manners, the test module 14 may also include a voltage stabilizing circuit and a current stabilizing circuit, so as to improve the safety of the micro-resistance testing device 100 .

In this embodiment, the charge-coupled image sensor includes a lower sensor (not shown) and an upper sensor (not shown), the lower sensor is fixed on the base 11, close to the The lower fixed platform 121 is described to monitor the horizontal position of the lower fixed platform 121. The upper sensor is fixed on the upper fixed platform 122 to monitor the horizontal position of the lower fixed platform 122, so as to facilitate the adjustment of the horizontal positions of the lower fixed platform 121 and the upper fixed platform 122, that is, to facilitate the adjustment of the lower fixed platform 122. The horizontal positions of the jig 13 and the circuit board are described, so that the jig 13 is accurately aligned with the circuit on the circuit board for testing, thereby improving the testing accuracy of the micro-resistance testing device 100 .

In this embodiment, the driving mechanism 20 is fixed in the base 11, and the driving mechanism 20 is a motor. The lower fixing platform 121 slides vertically relative to the upper fixing platform 122 . When the driving mechanism 20 drives the lower fixing table 121 to move closer to the upper fixing table 122, the circuit board of the upper fixture 132 is brought into contact with the probes on the lower fixture 131, so as to realize the circuit The micro-resistance on the board is tested, and when the micro-resistance test of the circuit board is finished, the driving mechanism 20 drives the lower fixed table 121 away from the upper fixed table 122, so that the circuit board is far away from the test module 14, so that it is convenient to take out the circuit board. In other practical ways, the driving mechanism 20 may also be a hydraulic driving machine or a pneumatic driving machine.

In this embodiment, the control mechanism 30 includes a display 31, an operation keyboard 32, and a control processor 33. The display 31 is fixed on the base 11 and electrically connected to the test module 14 for displaying the For the test information of the test module 14 , the operation keyboard 31 is fixed on the base 11 and electrically connected to the test module 14 for inputting test instructions to the test module 14 . The control processor 33 is a computer. The control processor 33 is electrically connected to the display 31 and the operation keyboard 32, and is electrically connected to the test module 14, so as to process the test signal of the test module 14, and to the test signal of the test module 14. A test instruction is sent, and at the same time, the control processor 33 receives a manipulation instruction from the operation keyboard 32 and inputs a display instruction to the display 31 . In other embodiments, the control mechanism 30 may also be a multi-server computer.

Further, the micro-resistance testing device 100 also includes a feeding mechanism 40, and the feeding mechanism 40 includes a feeding frame 41 and a feeding table 42 that is slidably connected to the feeding frame 41, and the feeding frame 41 Fixed on one side of the base 11 , the feeding table 42 is used to place the circuit board on the upper fixture 11 , and the driving mechanism 20 also drives the feeding table 42 to slide.

In this embodiment, the feeding mechanism 40 further includes a first vertical transmission shaft 43 fixed to the feeding frame 41 and a first horizontal transmission shaft 44 slidably connected to the first vertical transmission shaft 43 . The first horizontal transmission shaft 44 is slidably disposed on the first vertical transmission shaft 43 along the vertical direction, and the feeding platform 42 is slidably disposed on the first horizontal transmission shaft 44 along the horizontal direction. The driving mechanism 20 also includes a feed motor (not shown), the feed motor drives the first horizontal transmission shaft 44 to slide, and drives the feed table 42 to slide. In this way, the circuit board can be automatically clamped on the lower fixture 131 , and the operating efficiency of the micro-resistance testing device 100 can be improved. In other practical ways, the number of the first horizontal transmission shafts may also be two, so that the circuit board can be adjusted in two dimensions on the horizontal plane.

Further, the micro-resistance testing device 100 also includes a discharge mechanism 50, and the discharge mechanism 50 includes a discharge frame 51 and a discharge platform 52 that is slidably connected to the discharge frame 51, and the discharge frame 51 Fixed on the other side of the base 11 relative to the feed frame 41, the discharge table 52 is used to take out the circuit board from the lower fixture 131, and the drive mechanism 20 also drives the discharge table 52 slide.

In this embodiment, the discharge mechanism 50 further includes a second vertical transmission shaft 53 fixed to the discharge frame 51 and a second horizontal transmission shaft 54 slidingly connected to the second vertical transmission shaft 53, The second horizontal transmission shaft 54 is slidably disposed on the second vertical transmission shaft 53 along the vertical direction, and the discharge table 52 is slidably disposed on the second horizontal transmission shaft 54 along the horizontal direction. The driving mechanism 30 also includes a discharge motor (not shown), the discharge motor drives the second horizontal transmission shaft 54 to slide, and drives the discharge table 52 to slide. In this way, the circuit board can be automatically removed from the lower fixture 131 , and the operating efficiency of the micro-resistance testing device 100 can be improved. In other practical ways, the number of the second horizontal transmission shafts may also be two, so that the circuit board can be adjusted in two dimensions on the horizontal plane.

Further, the micro-resistance testing device 100 also includes a fine-tuning mechanism 60, and the fine-tuning mechanism 60 is installed on the base 11 to adjust the level of the upper fixed platform 122 and/or the lower fixed platform 121. Location.

In this embodiment, the fine-tuning mechanism 60 includes an upper adjustment assembly 61 and a lower adjustment assembly 62, and the upper adjustment assembly 61 is installed on the base 11 to adjust the horizontal position of the upper fixed platform 122. The lower adjusting assembly 62 is installed on the base 11 for adjusting the horizontal position of the lower fixing platform 121 . Specifically, the upper adjustment assembly 61 includes two sets of mutually perpendicular screw drive shafts (not shown) and an upper adjustment motor (not shown), the two sets of screw drive shafts are used to move the upper fixed table 122 The horizontal position of the horizontal plane, when the upper sensor 152 monitors that there is a deviation in the horizontal position of the upper fixed platform 122, the upper sensor 152 sends a position command to the control mechanism 30, so that the control mechanism 30 controls the The upper adjusting assembly 61 of the fine-tuning mechanism 60 operates, and the upper adjusting motor drives two screw shafts to rotate, thereby fine-tuning the horizontal position of the upper fixing table 122, that is, fine-tuning the horizontal position of the circuit board, thereby ensuring that the micro-resistance Test accuracy of the test device 100 . The lower adjustment assembly 62 is configured in the same structure as the upper adjustment assembly 61 , and will not be repeated here. In other embodiments, the upper adjustment assembly may also be composed of two hydraulic transmission shafts and a hydraulic drive motor.

The micro-resistance testing device of the present utility model comprises a lower clamp fixed on the lower fixed platform and an upper clamp fixed on the upper fixed platform through the test fixture, and the upper clamp is arranged relative to the lower clamp , the lower fixture is used to clamp the circuit board, the test module is clamped between the upper fixed table and the lower fixed table, and the test module is provided with a test probe and a test probe connected to the test probe A test circuit, the test probe is used to contact the micro-resistor on the circuit board when the upper fixture and the lower fixture are close together, the charge-coupled image sensor is fixed on the upper fixture and the lower fixture It is used to monitor the position information of the circuit board, so as to realize the automatic test of the micro-resistance of the circuit board, so as to meet the test of the micro-resistance of the batch circuit board, thereby improving the efficiency of the micro-resistance test.

The foregoing is a preferred embodiment of the present utility model, and it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present utility model, some improvements and modifications can also be made. These improvements and modifications It is also regarded as the protection scope of the present utility model.

Claims (10)

1. a micro-resistance testing device, for testing the micro-resistance of circuit board, it is characterized in that, described micro-resistance device comprises test mechanism, drive mechanism and control mechanism, and described test mechanism comprises base, workbench, test fixture A tool, a test module and a charge-coupled image sensor, the workbench includes a lower fixed table mounted on the base and an upper fixed table slidably set relative to the lower fixed table, and the test fixture includes a fixed The lower fixture on the lower fixed platform and the upper fixture fixed on the upper fixed platform, the upper fixture is arranged relative to the lower fixture, the lower fixture is used to clamp the circuit board, and the upper fixed platform The test module is clamped between the lower fixed table, the test module is provided with a test probe and a test circuit connected to the test probe, and the test probe is used for connecting the upper fixture and the The lower clamp contacts the micro-resistor on the circuit board when the lower clamp approaches, the charge-coupled image sensor is fixed between the upper clamp and the lower clamp, and is used to monitor the position information of the circuit board, and the driving mechanism drives The lower fixed table slides, and the control mechanism is electrically connected to the drive mechanism and the test module to control the operation of the drive mechanism and control the test module to test the micro-resistance of the circuit board. 2. micro-resistance testing device according to claim 1, is characterized in that, described micro-resistance testing device also comprises feeding mechanism, and described feeding mechanism comprises feeding rack and is slidably connected to the feeder of described feeding rack. A feeding table, the feeding frame is fixed on one side of the base, the feeding table is used to place the circuit board to the lower fixture, and the driving mechanism also drives the feeding table to slide. 3. micro-resistance testing device according to claim 2, is characterized in that, described feed mechanism also comprises the first vertical transmission shaft that is fixed on described feed rack and is slidably connected with described first vertical transmission shaft. The first horizontal transmission shaft of the shaft, the first horizontal transmission shaft is slidably arranged on the first vertical transmission shaft in the vertical direction, and the feeding table is slid on the first horizontal transmission shaft in the horizontal direction set up. 4. micro-resistance testing device according to claim 1, is characterized in that, described micro-resistance testing device also comprises discharge mechanism, and described discharge mechanism comprises discharge frame and is slidably connected to the discharge frame of described discharge frame. A material table, the discharge frame is fixed on the other side of the base relative to the feed frame, the discharge table is used to take out the circuit board from the lower fixture, and the drive mechanism also drives the discharge Table slides. 5. micro-resistance testing device according to claim 4, is characterized in that, described discharge mechanism also comprises the second vertical transmission shaft that is fixed on described discharge rack and is slidably connected with described second vertical transmission shaft. The second horizontal transmission shaft of the shaft, the second horizontal transmission shaft is slid on the second vertical transmission shaft in the vertical direction, and the discharge table is slid on the second horizontal transmission shaft in the horizontal direction set up. 6. micro-resistance testing device according to claim 1, is characterized in that, described micro-resistance testing device also comprises fine-tuning mechanism, and described fine-tuning mechanism is installed on the described base, in order to adjust described upper fixed table or / and the horizontal plane position of the lower fixed platform. 7. The micro-resistance testing device according to claim 1, wherein the fine-tuning mechanism includes an upper adjustment assembly and a lower adjustment assembly, and the upper adjustment assembly is installed on the base to adjust the upper adjustment assembly. The front, rear, left and right, and rotation angle positions of the fixed platform, the lower adjustment component is installed on the base, and is used to adjust the front, rear, left and right, and rotation angle positions of the lower fixed platform. 8. micro-resistance testing device according to claim 1, is characterized in that, described control mechanism comprises display and operation keyboard, and described display is fixed on the described base, is electrically connected with described testing module, is used for displaying For the test information of the test module, the operation keyboard is fixed on the base, electrically connected to the test module, and used for inputting test instructions to the test module. 9. The micro-resistance testing device according to claim 8, wherein the control mechanism further comprises a control processor electrically connected to the display and the operation keyboard, and the control processor is a computer. 10. The micro-resistance testing device according to claim 1, wherein the driving mechanism is a motor.