1. The utility model provides a makeup automatic current test fixture which characterized in that includes:

the testing machine box is internally provided with a testing circuit and is used for carrying out current testing on a product;

the jointed board tray is arranged on the test case and used for bearing a product to be tested;

the probe is arranged on the needle plate below the jointed board tray and is used for connecting the product with the test circuit;

the fixing device is arranged above the jointed board tray and used for fixing the product on the jointed board tray;

and the protection device is arranged on the test case, plays a role in protection and is connected with the test circuit.

2. The automatic current test jig for jointed boards as claimed in claim 1,

the test circuit comprises a state switching circuit, a current sampling circuit, a range switching circuit, an operational amplifier circuit, an AD conversion circuit, a signal multiplexing circuit, a microprocessor unit, an indicator light circuit, a serial port conversion circuit and a power supply circuit, wherein the input end of the current sampling circuit is connected with a probe and used for sampling current signals, the output end of the current sampling circuit is connected with the input end of the operational amplifier circuit through the range switching circuit, the range switching circuit is connected with the microprocessor unit, the state switching circuit is connected with a tested product and used for switching the working state of the tested product, the state switching circuit is connected with the microprocessor unit, the output end of the operational amplifier circuit is connected with the input end of the AD conversion circuit through the signal multiplexing circuit, the output end of the AD conversion circuit is connected with the microprocessor unit, and the microprocessor unit outputs detection current through the serial port conversion circuit or the indicator light circuit, the power supply circuit is used for supplying power.

3. The automatic current test jig for jointed boards as claimed in claim 1 or 2, wherein,

the testing machine case is provided with keys, and the keys comprise a starting key and an emergency stop key.

4. The automatic current test jig for jointed boards as claimed in claim 2, wherein,

the fixing device comprises a support, an air cylinder and a grid plate, the support is fixedly installed on the testing case, the air cylinder is installed on the support, the air cylinder is connected with the microprocessor unit, the grid plate is connected with a piston rod of the air cylinder, and the grid plate is matched with the position of the jointed board tray.

5. The automatic current test jig for jointed boards as claimed in claim 2, wherein,

the protection device comprises a safety grating, the safety grating is installed on the test case and used for detecting whether an object exists on the test case, and the safety grating is connected with the microprocessor unit.

6. The automatic current test jig for jointed boards as claimed in claim 5,

protection device still includes disc, first electronic switch, second electronic switch, first spring and second spring, the through-hole has been seted up at the disc middle part, through-hole size and measuring stylus phase-match, the disc is installed at the measuring stylus middle part, the one end fixed mounting of first spring is at the lower extreme of disc, the other end and the makeup tray butt of first spring, first spring is connected with power supply circuit through first electronic switch, the one end of second spring and the upper end fixed connection of disc, the other end of second spring with be surveyed the product butt, the second spring is connected with power supply circuit through second electronic switch, first electronic switch and second electronic switch all are connected with microprocessor unit.

Background

The current test method of the product in the existing UUT (Unit Under test) test comprises the following steps: 1. manual scheme: UUT passes through anchor clamps, uses the current sampling circuit to convert current signal to voltage signal and enlargies, and the signal connection voltmeter after the amplification passes through current value, sampling proportion, the magnification in advance through converting into equivalent voltage value, through the artifical range that switches, and the manual work switches UUT operating condition, and the manual work reads the voltage value, and whether the artifical current value of judging accords with the restriction requirement, its shortcoming is: the full-manual operators are easy to fatigue, easily miss and misjudge, the testing speed is slow, the yield is greatly influenced by the proficiency of the operators, the single-board operation yield is low, and the reliability is poor; 2. automatic test scheme: UUT passes through a clamp, a current sampling circuit is used for converting a current signal into a voltage signal, an operational amplification circuit amplifies the current signal and outputs the voltage signal to a digital voltmeter, computer software controls a relay board to switch a range, switch a UUT state, read the digital voltmeter and judge whether the current meets the requirement or not through software, and PASS and FAIL results are output to an operator on a software interface; the disadvantages are: each set of equipment has higher cost, complex system structure and huge volume.

For example, chinese patent CN201611245762.3 discloses an apparatus for testing the overall current of a terminal. Although the current testing equipment realizes the automatic testing of the current, each set of equipment has higher cost, complex system structure and large volume, and can only test one product at a time, thereby having low efficiency.

Disclosure of Invention

The invention mainly solves the problems of low test efficiency and high cost of the current test equipment in the prior art; the utility model provides a makeup automatic current test fixture, the test of many boards improves efficiency of software testing, and whole test process automation goes on, and simple structure can test the operating condition electric current and the standby state electric current of being surveyed the product, and the application is strong.

The technical problem of the invention is mainly solved by the following technical scheme: an automatic current test clamp for a jointed board comprises a test case, wherein a test circuit is arranged in the test case and used for carrying out current test on a product; the jointed board tray is arranged on the test case and used for bearing a product to be tested; the probe is arranged on the needle plate below the jointed board tray and is used for connecting the product with the test circuit; the fixing device is arranged above the jointed board tray and used for fixing the product on the jointed board tray; and the protection device is arranged on the test case, plays a role in protection and is connected with the test circuit. Set up the makeup tray on quick-witted case, carry out putting and the location of being surveyed the product, the makeup tray is provided with a plurality of acupuncture points, and a being surveyed product all can be deposited to every acupuncture point, and a plurality of being surveyed products can be deposited simultaneously to the makeup tray of representative, has improved the current test efficiency of product, sets up protection device, effectively protects tester's personal safety.

Preferably, the test circuit comprises a state switching circuit, a current sampling circuit, a range switching circuit, an operational amplifier circuit, an AD conversion circuit, a signal multiplexing circuit, a microprocessor unit, an indicator light circuit, a serial port conversion circuit and a power supply circuit, wherein an input end of the current sampling circuit is connected with the probe for sampling a current signal, an output end of the current sampling circuit is connected with an input end of the operational amplifier circuit through the range switching circuit, the range switching circuit is connected with the microprocessor unit, the state switching circuit is connected with a tested product for switching a working state of the tested product, the state switching circuit is connected with the microprocessor unit, an output end of the operational amplifier circuit is connected with an input end of the AD conversion circuit through the signal multiplexing circuit, and an output end of the AD conversion circuit is connected with the microprocessor unit, the microprocessor unit outputs the detection current through a serial port conversion circuit or an indicator light circuit, and the power supply circuit is used for supplying power. The setting state switching circuit can rapidly control the switching working state of the tested product through the microprocessor unit, realize the current test of the tested product in different working states, can switch different measuring ranges through the range switching circuit, the test is carried out on different measuring ranges in the same working state, the test accuracy and efficiency are higher, a plurality of current sampling circuits are arranged, corresponding to the number of the tested products, the signal multiplexing circuit concentrates the multi-path sampling signals and then sequentially supplies the signals to the AD conversion circuit to sequentially realize the current test of a plurality of tested products, the microprocessor unit is provided with current upper and lower limit thresholds of the tested products in different working states, the test result is output by comparing the collected current with the current upper and lower limit threshold values, the test result can be displayed through the indicator lamp, and can also be output through the serial port and visually displayed through the PC terminal.

Preferably, the test case is provided with keys, and the keys comprise a start key and an emergency stop key. The current test is started by pressing the start key, and when an emergency occurs, the emergency stop key is pressed to cut off the power supply, so that the safety of the equipment is effectively protected.

Preferably, the fixing device comprises a support, an air cylinder and a grid plate, the support is fixedly installed on the testing case, the air cylinder is installed on the support and connected with the microprocessor unit, the grid plate is connected with a piston rod of the air cylinder, and the grid plate is matched with the position of the jointed board tray. Adopt cylinder and grid tray to fix the product of being surveyed, prevent to be surveyed the product and appear removing in the test procedure, improve the stability of test.

Preferably, the protection device comprises a safety grating, the safety grating is mounted on the test case, the safety grating is used for detecting whether an object exists on the test case, and the safety grating is connected with the microprocessor unit. Whether the tester leaves the testing area of the case or not is detected by adopting the safety grating, so that the personal safety of the tester is guaranteed.

Preferably, the protection device further comprises a disc, a first electronic switch, a second electronic switch, a first spring and a second spring, wherein the through hole is formed in the middle of the disc, the size of the through hole is matched with the measuring pin, the disc is installed in the middle of the measuring pin, one end of the first spring is fixedly installed at the lower end of the disc, the other end of the first spring is abutted to the jointed board tray, the first spring is connected with a power supply circuit through the first electronic switch, one end of the second spring is fixedly connected with the upper end of the disc, the other end of the second spring is abutted to a product to be measured, the second spring is connected with the power supply circuit through the second electronic switch, and the first electronic switch and the second electronic switch are both connected with the microprocessor unit. Under the normal state, the microprocessor unit controls the first electronic switch to be disconnected and the second electronic switch to be closed, so that the first spring is in a natural state when the power failure occurs, the second spring is in a contracted state when the power is applied to the second spring, the test needle is convenient to contact with a tested product, when the tested product has problems in the test process, such as short circuit or fire, the tester cannot press an emergency stop key at the first time, or when the safety grating detects that the arm of the tester is in the test area during the test, the microprocessor unit controls the first electronic switch to be closed and the second electronic switch to be disconnected, so that the first spring is electrified and contracted, the second spring is powered and contracted to return to a natural state when the power failure occurs, the tested product is jacked open when the second spring returns to a natural state, the test needle is pulled away from the tested product during the contraction of the first spring, so that the tested product is not in contact with the test needle, effectively protecting the safety of products and testing personnel.

The invention has the beneficial effects that: (1) the tested products are stored by arranging the jointed board tray on the case, the jointed board tray is provided with a plurality of acupuncture points, each acupuncture point can store one tested product, the jointed board tray can simultaneously store a plurality of tested products, the current testing efficiency of the products is improved, and the personal safety of testing personnel is effectively protected by arranging the protection device; (2) set up state switching circuit accessible microprocessor unit rapid control and be surveyed the product and switch operating condition, realize being surveyed the current test of the different operating condition of product, can carry out the switching of different ranges through the journey switching circuit, test same operating condition's different ranges, current sampling circuit sets up a plurality ofly, correspond the quantity of test product, signal multiplex circuit concentrates multichannel sampling signal and then provides AD converting circuit in proper order, realize the current test of a plurality of products of being surveyed in order, test accuracy and efficiency of software testing have been promoted.

Drawings

Fig. 1 is a schematic structural diagram of a current test fixture according to a first embodiment of the invention.

In the figure, 1 is a test case, 2 is a spliced board tray, 3 is a safety grating, 4 is a support, 5 is a cylinder, and 6 is a grid plate.

Detailed Description

The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.

The first embodiment is as follows: an automatic current test clamp for a jointed board is shown in figure 1 and comprises a test case 1, wherein a test circuit is arranged in the test case and is used for carrying out current test on generated current; the jointed board tray 2 is arranged on the testing machine case and used for bearing a product to be tested; the probe is arranged on the needle plate below the jointed board tray and is used for connecting the product with the test circuit; the fixing device is arranged above the jointed board tray and used for fixing the product on the jointed board tray; and the protection device is arranged on the test case, plays a role in protection and is connected with the test circuit. The utility model discloses a jigsaw tray, including makeup tray, stand, and stand.

The test circuit comprises a state switching circuit, a current sampling circuit, a range switching circuit, an operational amplification circuit, an AD conversion circuit, a signal multiplexing circuit, a microprocessor unit, an indicator light circuit, a serial port conversion circuit and a power supply circuit, wherein the input end of the current sampling circuit is connected with a probe and used for sampling a current signal, the output end of the current sampling circuit is connected with the input end of the operational amplification circuit through the range switching circuit, the range switching circuit is connected with the microprocessor unit, the state switching circuit is connected with a tested product and used for switching the working state of the tested product, the state switching circuit is connected with the microprocessor unit, the output end of the operational amplification circuit is connected with the input end of the AD conversion circuit through the signal multiplexing circuit, the output end of the AD conversion circuit is connected with the microprocessor unit, and the microprocessor unit outputs a detected current through the serial port conversion circuit or the indicator light circuit, the power supply circuit is used for supplying power. The microprocessor unit is provided with current upper and lower limit thresholds of a tested product in different working states, a test result is output by comparing the collected current with the current upper and lower limit thresholds, the test result can be displayed through the indicator lamp, the indicator lamp circuit is connected with indicator lamps with different colors, wherein the red light is on to represent that the test current is out of the set current upper and lower limit thresholds, the green light is on to represent that the test current is in the set current upper and lower limit thresholds, the test result can also be output to the PC terminal through a serial port, and the PC terminal visually displays the test result.

The testing machine case is provided with keys which comprise a starting key and an emergency stop key.

The fixing device comprises a support 4, a cylinder 5 and a grid plate 6, the support is fixedly installed on the testing case, the cylinder is installed on the support and connected with the microprocessor unit, the grid plate is connected with a piston rod of the cylinder, and the grid plate is matched with the position of the jointed plate tray.

The protection device comprises a safety grating 3, the safety grating is arranged on the testing case and used for detecting whether an object exists on the testing case, and the safety grating is connected with the microprocessor unit.

The protection device of the embodiment further comprises a disc, a first electronic switch, a second electronic switch, a first spring and a second spring, wherein a through hole is formed in the middle of the disc, the size of the through hole is matched with that of a measuring pin, the disc is installed in the middle of the measuring pin, one end of the first spring is fixedly installed at the lower end of the disc, the other end of the first spring is abutted to a jointed board tray, the first spring is connected with a power supply circuit through the first electronic switch, one end of the second spring is fixedly connected with the upper end of the disc, the other end of the second spring is abutted to a tested product, the second spring is connected with the power supply circuit through the second electronic switch, and the first electronic switch and the second electronic switch are both connected with a microprocessor unit; the improvement effect with the first embodiment is as follows: through the power-on and power-off to first spring and second spring for first spring and second spring shrink and reply, when making the product under test when breaking down in the test procedure, can be fast with the product under test and probe disconnection, protective apparatus's safety.

The specific working principle of the invention is as follows: the tester places the products in the acupuncture points of the jointed board tray according to the number of the tested products, the jointed board tray after the products are placed and positioned is fixed on the tester case, the start button is pressed, the safety grating detects whether an object exists above the tester case in real time, if the tester arm leaves the upper position of the tester case, the microprocessor unit controls the cylinder to work, the piston rod of the cylinder drives the grid plate to press down, so that the current test interface of the tested products is connected with the probe, the current sampling circuit collects the current of the tested products, converts the current signals into voltage signals, amplifies the voltage signals through the operational amplification circuits, supplies the amplified signals to the signal multiplexing circuit, the signal multiplexing circuit sequentially supplies the signals to the AD conversion circuit, the microprocessor unit reads the conversion value of the AD conversion circuit and compares the conversion value with the upper and lower limit threshold values of the modes, and obtaining a test result, outputting the test result to a PC (personal computer) end through a serial port, visually displaying the test result by the PC end, controlling the working state of the tested product through a switching circuit, enabling the tested product to work in different modes, switching the measuring range for retesting, and completing the rapid current test of a plurality of tested electronic products.

When the safety grating detects that the arm moves, the air cylinder stops working, the test is finished without lifting, and the test is started without pressing.

Under the normal state, the microprocessor unit controls the first electronic switch to be disconnected and the second electronic switch to be closed, so that the first spring is in a natural state when the power failure occurs, the second spring is in a contracted state when the power is applied to the second spring, the test needle is convenient to contact with a tested product, when the tested product has problems in the test process, such as short circuit or fire, the tester cannot press an emergency stop key at the first time, or when the safety grating detects that the arm of the tester is in the test area during the test, the microprocessor unit controls the first electronic switch to be closed and the second electronic switch to be disconnected, so that the first spring is electrified and contracted, the second spring is powered and contracted to return to a natural state when the power failure occurs, the tested product is jacked open when the second spring returns to a natural state, the test needle is pulled away from the tested product during the contraction of the first spring, so that the tested product is not in contact with the test needle, effectively protecting the safety of products and testing personnel.

The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.