CN106990292B

CN106990292B - Initiating explosive device testing circuit

Info

Publication number: CN106990292B
Application number: CN201710384594.4A
Authority: CN
Inventors: 吴姗珊
Original assignee: Beijing Xinfeng Aerospace Equipment Co Ltd
Current assignee: Beijing Xinfeng Aerospace Equipment Co Ltd
Priority date: 2017-05-26
Filing date: 2017-05-26
Publication date: 2024-03-29
Anticipated expiration: 2037-05-26
Also published as: CN106990292A

Abstract

The invention provides a initiating explosive device testing circuit which is different from the conventional initiating explosive device direct measurement circuit, and an instrument preheating time control circuit and a measuring loop current pre-detection circuit are added, so that the sufficient heating time of a testing instrument and the safety requirements of measuring loop current are met before the initiating explosive device is connected into a measuring loop, and the safety in the initiating explosive device testing process is greatly improved.

Description

Initiating explosive device testing circuit

Technical Field

The invention relates to an initiating explosive device testing circuit, which is designed for testing safety of initiating explosive devices.

Background

The safety executing mechanism (hereinafter referred to as "installation and execution") is an important initiating explosive device on a missile of a certain model, and unit test is carried out on the important initiating explosive device before assembly, so that the important link for guaranteeing the assembly test quality and safety is realized. The existing safety unit test equipment is a fire part test board which is self-developed by a general assembly and adjustment part of a two-station space, and a safety test module of the test board has certain potential safety hazard in the aspect of safety design.

The electric detonator used in the installation is an instantaneous blasting initiating explosive device, and in the unit test, the resistance value of the electric detonator is measured in a direct measurement mode, as shown in fig. 1, so that the risk is high. At present, a measuring instrument for measuring the resistance value of the electric detonator specified by a safety manufacturer is a TH2511 low-resistance tester (hereinafter referred to as a tester), the 20 ohm gear test current of the measuring instrument after being powered on and preheated for 15min is 2.5 milliamperes, the testing and safety requirements can be met, and if the power on and preheated time is insufficient or the gear is wrongly selected, the electric detonator can be ignited by the instantaneous high current possibly occurring in a measuring loop, so that serious harm is caused to testers and products.

Disclosure of Invention

The invention designs an electric detonator measuring circuit aiming at test safety, and adds an electric detonator test safety control circuit, which comprises a preheating time control circuit and a measuring loop current pre-detection circuit, and can ensure that before the electric detonator is tested, the power-on preheating time of a tester is sufficient and the measuring loop current meets the safety requirement, and the invention is as follows:

1 preheating time control

In order to ensure that the power-on preheating time of the tester is sufficient before the electric detonator is subjected to unit test, the invention designs a preheating time control circuit, and the control circuit comprises a power-on time delay type time relay (hereinafter referred to as a relay), a four-knife two-position selection switch (namely a preheating switch), a preheating completion indicator lamp and a relay power supply. As shown in fig. 2, the preheating completion indicator lamp and the electric detonator measuring loop are respectively connected in series with a group of normally open contacts of the relay, and two ends of the four-knife two-position selector switch are respectively connected with the direct current power supply and the relay coil, and the alternating current power supply and the power supply end of the tester.

The relay and the tester are controlled to be powered on simultaneously through the preheating switch, the preset delay time of the relay is the powering-on preheating time of the tester, and when the preheating time arrives, the relay delay contact acts, so that the electric detonator measuring circuit is changed from the off state to the on state. If the delay time of the relay is set to 15min, the electric detonator can be ensured to be connected to the measuring loop. The tester is powered on and preheated for 15min.

2 measurement Loop current detection

In order to ensure that the current of the measuring loop meets the safety requirement before the electric detonator is connected to the measuring loop, the invention designs a measuring loop current pre-detection circuit which comprises an ammeter, a resistor R and a two-knife two-bit selection switch (namely a current test switch). As shown in fig. 3, after the ammeter, the resistor R and the two-knife two-position selection switch are connected in series, the ammeter, the resistor R and the two-knife two-position selection switch are connected with the electric detonator measuring circuit in parallel.

After the tester is ready, the current testing switch is closed, the current value displayed by the ammeter is equivalent measuring loop current, if the current value meets the safety requirement, the current testing switch is opened, and the testing switch is closed, so that the electric detonator resistance value measurement can be performed.

By combining the two circuits, namely, the circuit shown in the figure 3 is combined with the circuit shown in the figure 2, as shown in the figure 4, the safety of electric detonator testing can be effectively improved, and the power-on preheating time and the electric detonator measuring loop current before the tester is used are ensured to meet the use requirement and the safety requirement of the instrument.

Advantageous effects

At present, the test bench of the mounting unit adopts a direct measurement mode for the resistance value of the electric detonator, namely, no control circuit exists between the tester and the electric detonator, and the electric detonator can be connected into a measurement loop for measuring the resistance value by only closing a test switch, as shown in figure 1. If the tester is not preheated or the measuring loop current is too large, the test switch is closed, the electric detonator is extremely easy to be ignited, and serious injury is caused to personnel and products. The improved electric detonator resistance measuring circuit can ensure that the preheating time of the tester is sufficient, the measuring loop current meets the safety requirement, and the safety in the initiating explosive device testing process is greatly improved.

Drawings

FIG. 1 is a diagram of a primary electric detonator measurement circuit;

FIG. 2 is a circuit diagram of an electric detonator measurement circuit incorporating a preheat time control function;

FIG. 3 is a diagram of an electric detonator measurement circuit incorporating a measurement loop current detection function;

fig. 4 is a diagram of an electric detonator measurement circuit incorporating a preheat time control and measurement loop current detection function.

Detailed Description

The invention relates to an improvement of a resistance measuring circuit of a missile-borne electric detonator of a certain model, which is applied to a specific circuit by combining the circuit diagrams shown in fig. 2 and 3 in order to simultaneously have the functions of preheating time control and measuring loop current detection, as shown in fig. 4. After the preheating switch is closed, a power supply of the tester is turned on, a measurement gear is selected, the preheating time reaches the preset delay time of the relay, the measurement loop is turned on, the preheating indicator lamp is turned on, the current test switch is turned on at the moment, if the current value displayed by the ammeter meets the safety requirement, the current test switch is turned off, and the test switch is turned on, so that the measurement of the resistance value of the electric detonator can be performed under the premise of ensuring the test safety.

Fig. 4 shows a safety improvement circuit of a fire part test bench of a missile of a certain model, the circuit shown in fig. 2, 3 or 4 can be applied to the fire part test of a missile of another model according to test requirements, and the circuit shown in fig. 2 can be applied to the condition that other test process equipment or devices need to be preheated.

Claims

1. The test method of the initiating explosive device test circuit is characterized by comprising the following steps of:

1) The preheating time control circuit comprises a time relay with a power-on time delay, a four-knife two-position selection switch, an indicator lamp and a relay power supply, the four-knife two-position selection switch is used for controlling the power-on of the time relay and the test instrument simultaneously, a initiating explosive device measurement loop is connected with a normally open contact of the time relay, the time delay of the time relay is adjusted to be the power-on preheating time of the test instrument, so that the time delay meets the power-on preheating time requirement of the test instrument, the indicator lamp indicates the preheating completion condition of the test instrument, and the on-off switching time of the initiating explosive device measurement loop is controlled;

2) The current detection circuit comprises an ammeter, a resistor and a two-knife two-bit selection switch, wherein the ammeter, the resistor and the two-knife two-bit selection switch are connected in series, a resistor equivalent to the resistance value of the corresponding initiating explosive device is connected in series in the current detection circuit, and the current measured by the current detection circuit completely reflects the current when the initiating explosive device measurement circuit is connected so as to predict the circuit current when the initiating explosive device measurement circuit is connected.