Automatic multichannel initiating explosive device bridge resistance test system

Abstract

The invention discloses an automatic multichannel initiating explosive device bridge circuit resistance test system. The system comprises a multi-channel electrical property tester, an insulation tester, an insulation resistance test box and an electrical test switching box, wherein when the target resistance value of the initiating explosive device bridge circuit resistor to be tested is tested, the multi-channel electrical performance tester is electrically connected with the electrical test switching box; when the insulation resistance of the initiating explosive device bridge circuit resistor to be tested is tested, the insulation tester, the insulation resistance test box and the test position are electrically connected in sequence. The technical problem that in the prior art, the resistance values of a plurality of initiating explosive device bridge resistors to be measured cannot be automatically measured at a time is solved.

Description

Technical Field

[0001] The invention relates to the technical field of automatic testing of electrical properties of pyrotechnic bridge resistance, and in particular to an automated multi-channel pyrotechnic bridge resistance testing system. Background Art

[0002] In the current inspection and testing of pyrotechnic bridge resistance, due to the safety requirements of pyrotechnic bridge resistance, the most common ADC acquisition card based on DAQ data acquisition technology cannot be directly applied. It is necessary to design a complex analog conditioning circuit to achieve the isolation of the internal power supply and test current of the instrument. It is necessary to change the internal structure of the original board and add protection resistors to achieve current limitation. In addition, traditional DAQ data acquisition equipment has an ADC sampling and holding mechanism, so when one of the circuits in the test loop is broken and suspended, the internal holding capacitor does not change, and the test result of the suspended channel will be consistent with the result of the previous channel, causing serious quality risks. It may lead to errors in the detection of the quality of the pyrotechnic bridge resistance igniter. There are also multi-channel resistance testing equipment modified based on the automatic conduction device of multi-core cables.

[0003] However, the above-mentioned instruments and devices are large in size, heavy to carry, and require the line resistance values ​​of the test cables to be cleared one by one.

[0004] Therefore, if the resistance values ​​of dozens of circuits need to be measured at one time, common equipment will add a switching device to the front end of the traditional single-channel pyrotechnic bridge resistance tester, and then realize channel conversion between the switching devices in a manual / automatic way, and use the resistance tester to measure the data one by one. However, it lacks an integrated design, and the back-end test equipment does not have the ability to record and process multi-channel data, so data must be recorded manually one by one, which cannot adapt to large-scale detection tasks. Summary of the invention

[0005] The embodiment of the present invention provides an automated multi-channel pyrotechnic bridge resistance testing system, which at least solves the technical problem in the prior art that the resistance values ​​of multiple pyrotechnic bridge resistors to be tested cannot be automatically measured at one time.

[0006] According to one aspect of an embodiment of the present invention, an automated multi-channel pyrotechnic bridge resistance test system is provided. The system may include: a multi-channel electrical performance tester, an insulation tester, an insulation resistance test box, and an electrical measurement adapter box; wherein, when testing the target resistance value of the pyrotechnic bridge resistance to be tested, the multi-channel electrical performance tester is electrically connected to the electrical measurement adapter box; when testing the insulation resistance of the pyrotechnic bridge resistance to be tested, the insulation tester, the insulation resistance test box, and the test position are electrically connected in sequence.

[0007] Optionally, the multi-channel electrical performance tester includes a power supply and several target resistance test components, the power supplies are electrically connected to the several target resistance test components respectively, one target resistance test component includes a voltage regulator, a current limiting resistor, a current limiting protection resistor, a constant current circuit, a sampling circuit, a ground wire and a Kelvin four-wire port, the power supply is electrically connected to the voltage regulator, the voltage regulator is electrically connected to the sampling circuit and the current limiting resistor respectively, the current limiting resistor is electrically connected to the constant current circuit, the constant current circuit is electrically connected to the current limiting protection resistor, the sampling circuit is electrically connected to the current limiting protection resistor, the current limiting protection resistor is electrically connected to the Kelvin four-wire port, and the voltage regulator, the sampling circuit and the constant current circuit are all connected to the ground wire.

[0008] Optionally, the electrical test adapter box includes several test positions for the bridge resistance of the pyrotechnic product to be tested, and the Kelvin four-wire port is electrically connected to the test position, wherein each test position is provided with a test interface for the bridge resistance of the pyrotechnic product to be tested.

[0009] Optionally, the multi-channel electrical performance tester includes 30 target resistance test components, and the electrical test adapter box includes 30 test positions.

[0010] Optionally, the Kelvin four-wire port includes: a Kelvin four-wire I+ port, a Kelvin four-wire I- port, a Kelvin four-wire T+ port and a Kelvin four-wire T- port. The Kelvin four-wire I+ port, the Kelvin four-wire I- port, the Kelvin four-wire T+ port and the Kelvin four-wire T- port are all electrically connected to the bridge resistance test interface of the pyrotechnic product to be tested, the Kelvin four-wire T+ port and the Kelvin four-wire T- port are respectively electrically connected to the current limiting protection resistor electrically connected to the sampling circuit, and the Kelvin four-wire I+ port and the Kelvin four-wire I- port are respectively electrically connected to the current limiting protection resistor electrically connected to the constant current circuit.

[0011] Optionally, the insulation resistance tester is provided with an L terminal and an E terminal, the insulation resistance test box includes a negative loop test port and a positive loop test port, the L terminal of the insulation resistance tester is electrically connected to the negative loop test port and the positive loop test port of the insulation resistance test box, the negative loop test port and the positive loop test port of the insulation resistance test box are electrically connected to the electrical measurement adapter box, and the E terminal of the insulation resistance tester is electrically connected to the electrical measurement adapter box.

[0012] According to another aspect of an embodiment of the present invention, a method for using an automated multi-channel pyrotechnic bridge resistance test system is provided. The method may include: when the target resistance value of the pyrotechnic bridge resistance in the electrical measurement adapter box needs to be measured, a constant test current is applied to the pyrotechnic bridge resistance to be tested in the electrical measurement adapter box through the Kelvin four-wire I+ port and the Kelvin four-wire I- port electrically connected to the power supply to obtain a constant current value output by the pyrotechnic bridge resistance to be tested; the target voltage of the pyrotechnic bridge resistance to be tested in the electrical measurement adapter box is measured through the Kelvin four-wire T+ port and the Kelvin four-wire T- port electrically connected to the sampling circuit; based on the constant current value and the target voltage, the voltage of the pyrotechnic bridge resistance to be tested in the electrical measurement adapter box is obtained. The target resistance value of the pyrotechnic bridge resistor is obtained; when the insulation resistance value of the pyrotechnic bridge resistor in the electrical measuring adapter box needs to be measured, the L end of the insulation resistance tester is electrically connected to the negative loop test port and the positive loop test port on the insulation test box, and the negative loop test port and the positive loop test port on the insulation test box are electrically connected to the positive and negative poles of the pyrotechnic bridge resistor to be tested in the electrical measuring adapter box to obtain the initial resistance value of the pyrotechnic bridge resistor to be tested, and form a pyrotechnic bridge resistor loop, and the E end of the insulation resistance tester is connected to the outer casing of the pyrotechnic bridge resistor to be tested to obtain the insulation resistance value between the pyrotechnic bridge resistor loop and the outer casing of the pyrotechnic bridge resistor to be tested.

[0013] Beneficial effects of the present invention: (1) Compared with manual testing using a switching device, the detection efficiency of 30 channels is increased by 300%; (2) After metrological verification, the overall measurement accuracy of the testing equipment is within the measurement range of 0 to 60Ω, and the measurement accuracy is ±0.1Ω; (3) After measurement, the instrument test current is less than 10mA, which can meet the safety current limit of common pyrotechnic bridge resistance; (4) The insulation resistance of each interface of the equipment to the instrument and cable casing is ≥110MΩ (100V). BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 is a schematic diagram of an automated multi-channel pyrotechnic device bridge resistance testing system according to an embodiment of the present invention; Figure 2 is a schematic diagram of the internal circuit of each channel of a multi-channel electrical performance tester according to an embodiment of the present invention; Figure 3 is a schematic diagram of the arrangement of test positions for the bridge resistance of an initiator to be tested according to an embodiment of the present invention; Figure 4is a schematic diagram of a bridge resistance test interface contact piece of an initiator to be tested according to an embodiment of the present invention; Figure 5 is a flow chart of a method for using an automated multi-channel pyrotechnic bridge resistance testing system according to an embodiment of the present invention; Figure 6 is a Kelvin four-wire test principle diagram according to an embodiment of the present invention; Figure 7 is a schematic diagram of a short circuit fault in a constant current circuit in a multi-channel electrical performance tester according to an embodiment of the present invention; Figure 8 Schematic diagram of a short circuit fault in a sampling circuit in a multi-channel electrical performance tester according to an embodiment of the present invention. DETAILED DESCRIPTION

[0015] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only embodiments of a part of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0016] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, pyrotechnic bridge resistor or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, pyrotechnic bridge resistors or devices.

[0017] Example 1 Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the disclosure will be more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0018] In addition, the accompanying drawings are only schematic illustrations of the embodiments of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and their repeated descriptions will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0019] Figure 1 is a schematic diagram of an automated multi-channel pyrotechnic bridge resistance testing system according to an embodiment of the present invention. Figure 1 As shown, the system may include: a multi-channel electrical performance tester, an insulation tester, an insulation resistance test box, and an electrical measurement adapter box; wherein, when testing the target resistance value of the pyrotechnic bridge resistor to be tested, the multi-channel electrical performance tester is electrically connected to the electrical measurement adapter box; when testing the insulation resistance of the pyrotechnic bridge resistor to be tested, the insulation tester, the insulation resistance test box, and the test position are electrically connected in sequence.

[0020] Specifically, Figure 1 As shown, when testing the target resistance value of the pyrotechnic bridge resistor to be tested, the insulation resistance test box is closed, and the electrical measurement adapter box is electrically connected to the multi-channel electrical performance tester through the W3 cable, the W2 cable and the W1 cable, wherein there may be multiple multi-channel electrical performance testers, and when testing the insulation resistance of the pyrotechnic bridge resistor to be tested, the insulation resistance test box works, the electrical measurement adapter box is connected to the insulation resistance test box through the W3 cable, the insulation resistance test box is connected to the insulation resistance tester through the positive loop insulation test line and the negative loop insulation test line, and the electrical measurement adapter box is connected to the insulation tester through the wire, wherein there may be multiple multi-channel electrical performance testers.

[0021] Next, we will refer to Figure 1 The various parts of the above-mentioned automated multi-channel pyrotechnic bridge resistance testing system in this example implementation are described in more detail.

[0022] In one embodiment, the multi-channel electrical performance tester includes a power supply and several target resistance test components, the power supplies are electrically connected to the several target resistance test components respectively, one target resistance test component includes a voltage regulator, a current limiting resistor, a current limiting protection resistor, a constant current circuit, a sampling circuit, a ground wire and a Kelvin four-wire port, the power supply is electrically connected to the voltage regulator, the voltage regulator is electrically connected to the sampling circuit and the current limiting resistor respectively, the current limiting resistor is electrically connected to the constant current circuit, the constant current circuit is electrically connected to the current limiting protection resistor, the sampling circuit is electrically connected to the current limiting protection resistor, the current limiting protection resistor is electrically connected to the Kelvin four-wire port, and the voltage regulator, the sampling circuit and the constant current circuit are all connected to the ground wire.

[0023] Specifically, Figure 2 Schematic diagram of the internal circuit of each channel of the multi-channel electrical performance tester according to an embodiment of the present invention. Figure 2As shown, the power supply provides a constant test current for a target resistance test component, and the target resistance test component includes: a power supply, a voltage regulator, a current limiting resistor, a current limiting protection resistor, a constant current circuit, a sampling circuit, a ground wire and a Kelvin four-wire port. The power supply is electrically connected to the voltage regulator, the voltage regulator is electrically connected to the sampling circuit and the current limiting resistor respectively, the current limiting resistor is electrically connected to the constant current circuit, the constant current circuit is electrically connected to the current limiting protection resistor, the sampling circuit is electrically connected to the current limiting protection resistor, the current limiting protection resistor is electrically connected to the Kelvin four-wire port, and the voltage regulator, the sampling circuit and the constant current circuit are all connected to the ground wire.

[0024] In one embodiment, the electrical test adapter box includes several test positions for the bridge resistance of the pyrotechnic product to be tested, and the Kelvin four-wire port is electrically connected to the test position, wherein each test position is provided with a test interface for the bridge resistance of the pyrotechnic product to be tested.

[0025] Specifically, the electrical test adapter box includes: 30 test positions for the pyrotechnic bridge resistors to be tested, wherein each test position is provided with a pyrotechnic bridge resistor test interface to be tested, and each test interface is connected to a pyrotechnic bridge resistor to be tested. Figure 3 Schematic diagram of the test position arrangement of the bridge resistance of the pyrotechnic device to be tested according to an embodiment of the present invention. Figure 3 As shown, each test interface is connected to a pyrotechnic bridge resistor to be tested. When the interface is assembled, the production staff puts the pyrotechnic bridge resistor to be tested into the protection position of the 30-way transfer test box in sequence according to the numbering sequence, connects the pyrotechnic bridge resistor to be tested to the test interface, and transfers it to the test room. The contact pins in the test interface and the 30-way transfer test box body are reinforced and fixed by fastening glue. The lower part of the test box is lined with a metal copper mesh for grounding. Each channel of the multi-channel electrical performance tester includes 4 Kelvin four-wire ports. The 4 Kelvin four-wire ports are connected to a pyrotechnic bridge resistor to be tested through the test position to obtain a target resistance value of the pyrotechnic bridge resistor to be tested. Figure 4 Schematic diagram of the test interface contact of the bridge resistance of the pyrotechnic device to be tested according to an embodiment of the present invention. Figure 4 As shown, the inside of the test interface contact piece of the pyrotechnic bridge resistance test interface is two twisted contact pins protected by an insulating shell. The diameter of the contact pin is about 0.65mm to 0.66mm, the aperture of the protective shell is 1mm, and the maximum allowable tolerance range is 0.24mm. Each test position is provided with a pyrotechnic bridge resistance test interface to test the pyrotechnic bridge resistance of each test position.

[0026] In one embodiment, the multi-channel electrical performance tester includes 30 target resistance test components, and the electrical test adapter box includes 30 test positions.

[0027] Specifically, the multi-channel electrical performance tester includes 30 target resistance test components, and the electrical test adapter box includes 30 test positions.

[0028] In one embodiment, the Kelvin four-wire port includes: a Kelvin four-wire I+ port, a Kelvin four-wire I- port, a Kelvin four-wire T+ port and a Kelvin four-wire T- port. The Kelvin four-wire I+ port, the Kelvin four-wire I- port, the Kelvin four-wire T+ port and the Kelvin four-wire T- port are all electrically connected to the bridge resistance test interface of the pyrotechnic product to be tested, the Kelvin four-wire T+ port and the Kelvin four-wire T- port are respectively electrically connected to the current limiting protection resistor electrically connected to the sampling circuit, and the Kelvin four-wire I+ port and the Kelvin four-wire I- port are respectively electrically connected to the current limiting protection resistor electrically connected to the constant current circuit.

[0029] Specifically, Figure 2 As shown, the Kelvin four-wire I+ port and the Kelvin four-wire I- port supply power to the pyrotechnic bridge resistor to be tested, the Kelvin four-wire T+ port and the Kelvin four-wire T- port are used to measure the voltage across the pyrotechnic bridge resistor to be tested, the electrical measurement adapter box can contain up to 30 pyrotechnic bridge resistors to be tested, the multi-channel electrical performance tester can measure 30 pyrotechnic bridge resistors to be tested simultaneously, the multi-channel electrical performance tester and the electrical measurement adapter box are connected through a cable, the cable includes 120 wires, each 4 wires form a group, each 4 wires correspond to the measurement of a pyrotechnic bridge resistor to be tested, and the 4 wires correspond to the Kelvin four-wire I+ port, the Kelvin four-wire I- port, the Kelvin four-wire T+ port and the Kelvin four-wire T- port respectively.

[0030] In one embodiment, when the insulation resistance of the pyrotechnic bridge resistor in the electrical measurement adapter box needs to be measured, an insulation resistance tester is used, and the insulation resistance tester is provided with an L terminal and an E terminal. The L terminal of the insulation resistance tester is electrically connected to the negative loop test port and the positive loop test port of the insulation resistance test box, the negative loop test port and the positive loop test port of the insulation resistance test box are electrically connected to the electrical measurement adapter box, and the E terminal of the insulation resistance tester is electrically connected to the electrical measurement adapter box.

[0031] Specifically, when the insulation resistance of the pyrotechnic bridge resistor in the electrical measurement adapter box needs to be measured, an insulation resistance tester is used. The insulation resistance tester has the same number of channels as the multi-channel electrical performance tester, and can measure the insulation resistance of each pyrotechnic bridge resistor to be tested in the electrical measurement adapter box; the negative port at the L end of the insulation resistance tester is connected to the negative circuit test port on the insulation test box through a negative circuit insulation test line, and the positive port at the L end of the insulation resistance tester is connected to the positive circuit test port on the insulation test box through a positive circuit insulation test line. The negative circuit insulation test line and the positive circuit insulation test line are cables, 60 in total, 2 in total in each group, and each group measures the initial resistance value of a pyrotechnic bridge resistor to be tested. The E end of the insulation resistance tester is connected to the electrical measurement adapter box through wires, and there are 30 wires, each of which measures the insulation resistance of a pyrotechnic bridge resistor to be tested.

[0032] In the embodiment of the present invention, a multi-channel electrical performance tester, an insulation tester, an insulation resistance test box, and an electrical measurement adapter box are used; wherein, when testing the target resistance value of the pyrotechnic bridge resistor to be tested, the multi-channel electrical performance tester is electrically connected to the electrical measurement adapter box; when testing the insulation resistance of the pyrotechnic bridge resistor to be tested, the insulation tester, the insulation resistance test box, and the test position are electrically connected in sequence, thereby solving the technical problem in the prior art that the resistance values ​​of multiple pyrotechnic bridge resistors to be tested cannot be automatically measured at one time, and achieving the technical effect that the resistance values ​​of multiple pyrotechnic bridge resistors to be tested can be automatically measured at one time through the designed automated multi-channel pyrotechnic bridge resistance test system.

[0033] Example 2 According to an embodiment of the present invention, a method for using an automated multi-channel pyrotechnic bridge resistance testing system is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system comprising at least one set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in an order different from that shown here.

[0034] Figure 5 1 is a flow chart of a method for using an automated multi-channel pyrotechnic bridge resistance testing system according to an embodiment of the present invention. Figure 5 As shown, the method may include the following steps: Step S501, when the target resistance value of the pyrotechnic bridge resistor in the electrical measuring adapter box needs to be measured, a constant test current is applied to the pyrotechnic bridge resistor to be measured in the electrical measuring adapter box through the Kelvin four-wire I+ port and the Kelvin four-wire I- port electrically connected to the power supply, so as to obtain a constant current value output by the pyrotechnic bridge resistor to be measured; the target voltage of the pyrotechnic bridge resistor to be measured in the electrical measuring adapter box is measured through the Kelvin four-wire T+ port and the Kelvin four-wire T- port electrically connected to the sampling circuit; based on the constant current value and the target voltage, the target resistance value of the pyrotechnic bridge resistor to be measured in the electrical measuring adapter box is obtained.

[0035] In the technical solution provided in the above step S501 of the present invention, Figure 6 The figure is a schematic diagram of the Kelvin four-wire test according to an embodiment of the present invention. The Kelvin four-wire system is a measurement method that uses separate electrodes for current and voltage detection. Its advantage is that the electrodes for current and voltage are separated, eliminating the impedance interference of the wires. By connecting a voltage test circuit in parallel to the power supply circuit, since the resistance of the parallel circuit is much greater than that of the power supply circuit, "parallel shunt" is effectively prevented, and the potential difference obtained by the voltmeter is closer to The actual potential difference between the two ends can effectively eliminate the influence of the contact resistance of the wire and the connector on the test results. In our actual operation, we effectively avoided the problem of the 10m test cable being too long and the line group error being difficult to control. The multi-channel electrical performance tester contains 30 channels. The multi-channel electrical performance tester can measure the bridge resistance of 30 pyrotechnics to be tested at the same time. The multi-channel electrical performance tester is connected to the electrical measurement adapter box through a cable. The cable includes 120 wires, each of which is a group of 4 wires. Each 4 wires corresponds to a channel, and 4 wires correspond to measuring a bridge resistance of a pyrotechnic to be tested, that is, one channel measures a bridge resistance of a pyrotechnic to be tested. The 4 wires correspond to the Kelvin four-wire I+ port, the Kelvin four-wire I- port, the Kelvin four-wire T+ port and the Kelvin four-wire T- port respectively. The Kelvin four-wire I+ port and the Kelvin four-wire I- port of each channel apply a constant current to any bridge resistance of a pyrotechnic to be tested in the electrical measurement adapter box. A certain test current is obtained to obtain the constant current value output by any pyrotechnic bridge resistor to be tested; the target voltage of any pyrotechnic bridge resistor to be tested in the electrical measurement adapter box is measured through the Kelvin four-wire T+ port and the Kelvin four-wire T- port electrically connected to the sampling circuit of each channel; based on the constant current value and the target voltage, the target resistance value of any pyrotechnic bridge resistor to be tested in the electrical measurement adapter box is obtained, because the target resistance of 30 pyrotechnic bridge resistors to be tested can be measured at the same time.

[0036] Step S502, when the insulation resistance of the pyrotechnic bridge resistor in the electrical measurement adapter box needs to be measured, the L end of the insulation resistance tester is electrically connected to the negative loop test port and the positive loop test port on the insulation test box, the negative loop test port and the positive loop test port on the insulation test box are electrically connected to the positive and negative poles of the pyrotechnic bridge resistor to be tested in the electrical measurement adapter box, the initial resistance value of the pyrotechnic bridge resistor to be tested is obtained, and a pyrotechnic bridge resistor loop is formed, the E end of the insulation resistance tester is connected to the outer casing of the pyrotechnic bridge resistor to be tested, and the insulation resistance value between the pyrotechnic bridge resistor loop and the outer casing of the pyrotechnic bridge resistor to be tested is obtained.

[0037] In the technical solution provided in the above step S102 of the present invention, when the insulation resistance of 30 pyrotechnic bridge resistors in the electrical measurement adapter box needs to be measured, the insulation resistance test includes 30 channels, each channel corresponds to measuring the insulation resistance of a pyrotechnic bridge resistor to be tested, and the L end of the insulation resistance tester is connected to 30 negative loop test ports and positive loop test ports on the insulation test box through cables. The cable includes 60 wires, each 2 wires form a group, and one group measures the initial resistance of a pyrotechnic bridge resistor to be tested. A negative loop test line in a group is connected to a negative loop test port of the insulation resistance test box. Then, a positive loop test wire in a group is connected to a positive loop test port of the insulation resistance test box, and so on, the initial resistance values ​​of 30 pyrotechnic bridge resistors to be tested can be measured at the same time, and the E end of the insulation resistance tester is electrically connected to the casing of the pyrotechnic bridge resistor to be tested through cables. There are 30 cables, each of which is connected to the casing of a pyrotechnic bridge resistor to be tested, and finally the insulation resistance value between the pyrotechnic bridge resistance loop and the casing of each pyrotechnic bridge resistor to be tested can be obtained, and the insulation resistance value between the pyrotechnic bridge resistance loop and the casing of each pyrotechnic bridge resistor to be tested can be measured at the same time.

[0038] During the test, the multi-channel electrical performance tester and insulation resistance tester are equipped with a micro thermal printer, and the user can print the test results as needed; the multi-channel electrical performance tester has the function of zeroing the line resistance of the test cable, and can print the line resistance zeroing results.

[0039] Fail-safe design of testing equipment 1. Short circuit fault of constant current source in the pyrotechnic test circuit Figure 7 Schematic diagram of a short circuit fault in a constant current circuit in a multi-channel electrical performance tester according to an embodiment of the present invention. Figure 7 As shown, the power supply of the entire circuit is a lithium battery, the output working voltage is 16.8V, and the voltage regulator circuit reduces it to 3.3V. When a short circuit fault occurs in the constant current circuit, any one of the circuits fails. The extreme fault is that the constant current circuit is completely short-circuited. The test current output circuit is shown in Figure 7As shown by the green line, the current I=3.3V / (R1+R2+R3)=3.3V / 153Ω≈21.57mA. That is, in a very extreme short-circuit fault of the constant current circuit, the test current value flowing out of the I+ port is about 21.57mA. However, this extreme short-circuit fault of the constant current circuit can only occur when the circuit is artificially damaged.

[0040] 2. Sampling circuit short circuit failure Figure 8 Schematic diagram of a short circuit fault in a sampling circuit in a multi-channel electrical performance tester according to an embodiment of the present invention. Figure 8 As shown in the figure, when the sampling circuit fails, the extreme case is that the sampling circuit is completely short-circuited, and the test current loop is Figure 8 As shown, at this time, the current I = 3.3V / (R4+R5) = 3.3V / 2KΩ = 1.65mA. According to the provisions of GJB 5309-2004 "Test Methods for Explosive Devices Part 4: Determination of Bridge DC Resistance", the maximum test current of the test equipment should be no more than 10mA or 10% of the maximum ignition current of the blasting device (the smaller of the two). In the case of a very extreme sampling current short-circuit fault, the current output from the test port of the tester is 1.65mA, which will not cause safety hazards to the blasting device.

[0041] 3. External high voltage leads to circuit short circuit failure When the test port of the tester is accidentally connected to a high voltage circuit, it may cause a malfunction of the constant current circuit and the sampling circuit. In extreme cases, both the constant current circuit and the sampling circuit may cause a short circuit malfunction.

[0042] Since the high-voltage circuit is connected to the test port, the four ports I+, I-, T+, and T- may be injected with high-voltage current. At this time, at least one of the current-limiting protection resistors R2, R3, R4, and R5 connected in series to the port will be burned out. As a result, the current output by the tester will be disconnected from the circuit, which will not cause safety hazards to pyrotechnics.

[0043] 4. Printer failure causes test instrument failure The operating voltage of the printer is 9V. The overall circuit module is completely physically isolated from the test circuit module and is only connected to three serial communication lines on the control circuit board. There will be no printer failure or problem of internal capacitor discharge causing current to enter the test circuit.

[0044] In this embodiment, when the target resistance value of the pyrotechnic bridge resistor in the electrical measurement adapter box needs to be measured, a constant test current is applied to the pyrotechnic bridge resistor to be measured in the electrical measurement adapter box through the Kelvin four-wire I+ port and the Kelvin four-wire I- port electrically connected to the power supply, so as to obtain a constant current value output by the pyrotechnic bridge resistor to be measured; the target voltage of the pyrotechnic bridge resistor to be measured in the electrical measurement adapter box is measured through the Kelvin four-wire T+ port and the Kelvin four-wire T- port electrically connected to the sampling circuit; based on the constant current value and the target voltage, the target resistance value of the pyrotechnic bridge resistor to be measured in the electrical measurement adapter box is obtained; when the insulation resistance value of the pyrotechnic bridge resistor in the electrical measurement adapter box needs to be measured, the L end of the insulation resistance tester is connected to the insulation The negative loop test port and the positive loop test port on the test box are electrically connected, and the negative loop test port and the positive loop test port on the insulation test box are electrically connected to the positive and negative poles of the pyrotechnic bridge resistor to be tested in the electrical measurement adapter box, so as to obtain the initial resistance value of the pyrotechnic bridge resistor to be tested and form a pyrotechnic bridge resistance loop, and the E end of the insulation resistance tester is connected to the outer shell of the pyrotechnic bridge resistor to be tested, so as to obtain the insulation resistance value between the pyrotechnic bridge resistance loop and the outer shell of the pyrotechnic bridge resistor to be tested, thereby solving the technical problem in the prior art that the resistance values ​​of multiple pyrotechnic bridge resistors to be tested cannot be automatically measured at one time, and achieving the technical effect that the resistance values ​​of multiple pyrotechnic bridge resistors to be tested can be automatically measured at one time through the designed automated multi-channel pyrotechnic bridge resistance test system.

[0045] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0046] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0047] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0048] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed over multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0049] In addition, each functional unit in each embodiment of the present invention may be integrated into a first processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0050] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An automated multi-channel pyrotechnic bridge resistance test system, characterized in that: The system includes: a multi-channel electrical performance tester, an insulation tester, an insulation resistance test box, and an electrical test adapter box; among which, When testing the target resistance value of the bridge resistance of the pyrotechnic device to be tested, the multi-channel electrical performance tester is electrically connected to the electrical test adapter box; When testing the insulation resistance of the bridge resistor of the pyrotechnic device to be tested, the insulation tester, the insulation resistance test box and the test position are electrically connected in sequence.

2. The automated multi-channel pyrotechnic bridge resistance testing system according to claim 1, characterized in that: The multi-channel electrical performance tester includes a power supply and several target resistance test components. The power supplies are electrically connected to the several target resistance test components respectively. One target resistance test component includes a voltage regulator, a current limiting resistor, a current limiting protection resistor, a constant current circuit, a sampling circuit, a ground wire and a Kelvin four-wire port. The power supply is electrically connected to the voltage regulator. The voltage regulator is electrically connected to the sampling circuit and the current limiting resistor respectively. The current limiting resistor is electrically connected to the constant current circuit, the constant current circuit is electrically connected to the current limiting protection resistor, the sampling circuit is electrically connected to the current limiting protection resistor, the current limiting protection resistor is electrically connected to the Kelvin four-wire port, and the voltage regulator, the sampling circuit and the constant current circuit are all connected to the ground wire.

3. The automated multi-channel pyrotechnic device bridge resistance test system according to claim 2, characterized in that: The electrical test adapter box includes a plurality of test positions for the bridge resistance of the pyrotechnic to be tested, and the Kelvin four-wire port is electrically connected to the test position, wherein each test position is provided with a test interface for the bridge resistance of the pyrotechnic to be tested.

4. The automated multi-channel pyrotechnic device bridge resistance test system according to claim 3, characterized in that: The multi-channel electrical performance tester includes 30 target resistance test components, and the electrical test adapter box includes 30 test positions.

5. The automated multi-channel pyrotechnic device bridge resistance test system according to claim 3, characterized in that: The Kelvin four-wire port includes: a Kelvin four-wire I+ port, a Kelvin four-wire I- port, a Kelvin four-wire T+ port and a Kelvin four-wire T- port. The Kelvin four-wire I+ port, the Kelvin four-wire I- port, the Kelvin four-wire T+ port and the Kelvin four-wire T- port are all electrically connected to the bridge resistance test interface of the pyrotechnic product to be tested, the Kelvin four-wire T+ port and the Kelvin four-wire T- port are respectively electrically connected to the current limiting protection resistor electrically connected to the sampling circuit, and the Kelvin four-wire I+ port and the Kelvin four-wire I- port are respectively electrically connected to the current limiting protection resistor electrically connected to the constant current circuit.

6. The automated multi-channel pyrotechnic device bridge resistance test system according to claim 1, characterized in that: The insulation resistance tester is provided with an L terminal and an E terminal, the insulation resistance test box includes a negative loop test port and a positive loop test port, the L terminal of the insulation resistance tester is electrically connected to the negative loop test port and the positive loop test port of the insulation resistance test box, the negative loop test port and the positive loop test port of the insulation resistance test box are electrically connected to the electrical measurement adapter box, and the E terminal of the insulation resistance tester is electrically connected to the electrical measurement adapter box.

7. A method for using an automated multi-channel pyrotechnic device bridge resistance test system, characterized in that: Applied to the automated multi-channel pyrotechnic device bridge resistance test system according to any one of claims 1 to 6, the method comprises: When the target resistance value of the pyrotechnic bridge resistor in the electrical measurement adapter box needs to be measured, a constant test current is applied to the pyrotechnic bridge resistor to be measured in the electrical measurement adapter box through the Kelvin four-wire I+ port and the Kelvin four-wire I- port electrically connected to the power supply, so as to obtain a constant current value output by the pyrotechnic bridge resistor to be measured; the target voltage of the pyrotechnic bridge resistor to be measured in the electrical measurement adapter box is measured through the Kelvin four-wire T+ port and the Kelvin four-wire T- port electrically connected to the sampling circuit; based on the constant current value and the target voltage, the target resistance value of the pyrotechnic bridge resistor to be measured in the electrical measurement adapter box is obtained; When the insulation resistance of the pyrotechnic bridge resistor in the electrical measurement adapter box needs to be measured, the L end of the insulation resistance tester is electrically connected to the negative loop test port and the positive loop test port on the insulation test box, the negative loop test port and the positive loop test port on the insulation test box are electrically connected to the positive and negative poles of the pyrotechnic bridge resistor to be tested in the electrical measurement adapter box, so as to obtain the initial resistance value of the pyrotechnic bridge resistor to be tested and form a pyrotechnic bridge resistor loop, and the E end of the insulation resistance tester is connected to the outer casing of the pyrotechnic bridge resistor to be tested to obtain the insulation resistance value between the pyrotechnic bridge resistor loop and the outer casing of the pyrotechnic bridge resistor to be tested.

Images