Method for testing the shock wave resistance of electronic control modules for electronic detonators

Abstract

This invention discloses a test method for the shock wave resistance performance of electronic control modules used in electronic detonators. The method steps are as follows: S1: Preparation of the test sample; S2: Fixation of the test sample: The test electronic control module sample and the explosive charge are fixed in a steel frame and kept centered in a straight line. Then, the distance L between the test electronic control module sample and the explosive charge is adjusted to control the intensity of the shock wave received by the test electronic control module sample. Then, the steel frame is placed in an explosive water tank; S3: Delay time setting and detonation; S4: Data collection and processing; S5: Determination of the shock wave resistance performance of the test electronic control module. This invention can directly simulate the damage state of an electronic control module under the action of an explosive shock wave while in working order, as well as the change in internal energy storage at the moment of impact, to examine the shock wave resistance capability of the electronic control module. This method can be used as a pre-process for controlling the shock wave resistance performance of electronic detonators, more effectively ensuring product safety and reliability.

Description

Technical Field

[0001] This invention relates to the field of electronic detonator technology, and in particular to a test method for the shock wave resistance performance of electronic control modules for electronic detonators. Background Technology

[0002] Industrial electronic detonators (hereinafter referred to as electronic detonators) are a next-generation product in my country's civil explosives industry. The safety and reliability of their electronic control modules largely determine the reliability of their ignition. Most domestic electronic detonator manufacturers outsource their electronic control modules. Different detonator manufacturers source their electronic control modules from different electronic design companies, resulting in inconsistencies in circuit design, significant differences in component selection, inconsistent performance indicators, and substantial variations in product quality. In particular, there is a lack of testing methods for their impact resistance, antistatic properties, and electromagnetic inertia resistance.

[0003] There are many reasons why electronic detonators may misfire during use. However, in small-section delayed blasting projects, electronic detonators in the delay timer are subjected to the shock wave generated by the pre-detonation hole. This may cause damage or failure of components and reduced energy storage in the electronic detonator and its electronic control module, resulting in misfire, which seriously affects the promotion and application of electronic detonators.

[0004] Currently, there are reports on testing methods and devices for the shock wave resistance of electronic detonators, but testing methods for the shock wave resistance of the electronic control modules used in electronic detonators are lacking. Therefore, there is an urgent need to research a simple, easy-to-implement, highly repeatable method that simulates actual working conditions to test the shock wave resistance of electronic control modules. This would not only provide electronic detonator manufacturers with technical means to select electronic module devices for their detonators, but also lay the foundation for companies to control the shock wave resistance of their products. Summary of the Invention

[0005] Based on the technical problems existing in the background technology, this invention proposes a test method for the shock wave resistance performance of electronic control modules for electronic detonators. This method can directly simulate the damage state of electronic control modules under the action of explosion shock waves when they are in working order, as well as the changes in internal energy storage at the moment of impact, and examine the shock wave resistance capability of electronic control modules. This method can be used as a pre-process for controlling the shock wave resistance performance of electronic detonators, and can more effectively ensure the safety and reliability of products.

[0006] The present invention proposes a test method for the shock wave resistance performance of the electronic control module for electronic detonators, the method steps of which are as follows:

[0007] S1: Preparation of the sample to be tested

[0008] The electronic detonator initiator, which is matched with the electronic control module under test, is used to test it. After the test is normal, it is installed in a housing with openings at both ends, and the detonation wire and signal transmission line are led out from the two ends respectively.

[0009] S2: Fixation of the sample being tested

[0010] The electronic control module sample to be tested and the explosive charge are fixed in a steel frame and kept in a straight line. Then the distance L between the electronic control module sample and the explosive charge is adjusted to control the intensity of the shock wave received by the electronic control module sample. Then the steel frame is placed in the explosion water tank.

[0011] S3: Delay Time Setting and Detonation

[0012] The explosive charge was detonated using a detonator identical to that of the electronic control module sample under test. The detonator and the electronic control module under test were connected to the same busbar, and the detonation was carried out on the same network. The signal transmission line was connected to an oscilloscope.

[0013] S4: Data Collection and Processing

[0014] The tested electronic control module was removed after the impact, and the changes in its appearance and structure were observed. Damage detection of its internal components was performed using an electronic detonator initiator. The waveform changes of its energy storage under the instantaneous action of the shock wave were acquired using an oscilloscope.

[0015] S5: Determine the shock wave resistance of the tested electronic control module.

[0016] Preferably, the two ends of the housing in S1 are sealed with silicone for waterproofing.

[0017] Preferably, the explosive charge in S2 is a TNT, RDX, or HMX compressed explosive column.

[0018] Preferably, the explosive charge has a mass of 12-18g.

[0019] Preferably, the center of the explosive charge in S2 is submerged in water to a depth of 1-1.4m.

[0020] Preferably, the delay interval between the detonator and the tested electronic control module is not less than 100ms.

[0021] Preferably, the oscilloscope in S4 is a Tektronix MDO3034 oscilloscope.

[0022] Preferably, the empirical formula for testing the shock wave resistance performance of the electronic control module under test in S5 is:

[0023] P m =48.99(Q) 1 / 3 / R) 1.45

[0024] In the formula: P m, where is the peak pressure (MPa); Q is the weight of the explosive charge used in this test (kg); and R is the distance between the tested electronic control module and the center of the explosive charge (m).

[0025] Beneficial technical effects of the present invention:

[0026] (1) The present invention can directly simulate the damage state of an electronic control module under the action of an explosion shock wave and the change of internal energy storage at the moment of impact when the electronic control module is in working time, and examine the shock wave resistance of the electronic control module.

[0027] (2) The test method of the present invention can be used as a pre-process to control the shock wave resistance performance of electronic detonators, so as to more effectively ensure the safety and reliability of the products. Attached Figure Description

[0028] Figure 1 This is a diagram of a test system for the shock wave resistance performance of the electronic control module for electronic detonators proposed in this invention.

[0029] Figure 2 This is a transient waveform diagram of the energy storage voltage of the electronic control module for the electronic detonator proposed in this invention under impact.

[0030] In the diagram: 1-Detonator, 2-Explosive charge, 3-Electronic control module under test, 4-Voltage detection terminal, 5-Detonation busbar, 6-Detonator initiator, 7-Electronic detonator initiator, 8-Signal transmission line, 9-Oscilloscope, 10-Pressure transmission medium. Detailed Implementation

[0031] Example

[0032] The present invention proposes a test method for the shock wave resistance performance of the electronic control module for electronic detonators, the method steps of which are as follows:

[0033] S1: Preparation of the sample to be tested

[0034] The electronic detonator, which is matched with the electronic control module under test, is used to test it. After the test is normal, it is installed in a housing with openings at both ends. The detonation wire and signal transmission line are led out from the two ends respectively. The two ends of the housing are sealed with silicone for waterproofing. The test can be carried out only after the silicone has solidified and there is no water leakage at both ends when it is placed in water.

[0035] S2: Fixation of the sample being tested

[0036] The electronic control module sample and the explosive charge are fixed within a steel frame using a thin wire approximately 1 mm in diameter, ensuring their centers are aligned. The distance L between the sample and the explosive charge is adjusted to control the intensity of the shock wave received by the sample. The steel frame is then placed in an explosive water tank. The explosive charge is a TNT, RDX, or HMX compressed explosive column. In this embodiment, the explosive charge weighs 15g, and the center of the charge is submerged in water to a depth of 1.2m. The pressure-transmitting medium can be water, air, sand, or concrete, etc. Water is homogeneous, slightly compressible, and has good pressure-transmitting performance. Furthermore, water is conductive, so the electromagnetic field generated by the explosive charge's explosion can be ignored on the sample. Therefore, water is used as the pressure-transmitting medium in this example. A stable single-element explosive is preferred, ideally a TNT, RDX, or HMX compressed explosive column. In this example, the operation is carried out in an aqueous medium. The explosive charge is made of 15g of Ф25×27mm water-resistant rock emulsion explosive rolled with kraft paper. The amount of explosive charge can be adjusted according to the required shock wave intensity.

[0037] S3: Delay Time Setting and Detonation

[0038] The explosive charge is detonated using a detonator identical to that of the electronic control module under test. The detonator and the electronic control module are connected to the same busbar, employing a shared detonation network. The signal transmission line is connected to an oscilloscope, with a delay interval of no less than 100ms between the detonator and the electronic control module. The oscilloscope used is a Tektronix MDO3034. The detonator can be electronic, electric, or detonating cord detonators, etc., used to detonate the explosive charge. If an electronic detonator is used, its internal electronic control module is identical to that of the electronic control module under test, and the electronic control module and the detonator can be detonated using the same network.

[0039] S4: Data Collection and Processing

[0040] The tested electronic control module (ECU) was removed after the impact, and its external structure was observed. An electronic detonator initiator was used to inspect its internal components for damage. An oscilloscope was used to capture the waveform changes of its energy storage momentarily affected by the shock wave. The electronic detonator initiator was used to test, charge, and delay (discharge) the ECU sample. In this example, the detonator ignited first, and the resulting shock wave, transmitted through water, reached the ECU, which was in a delayed-time state. After being subjected to the shock wave, the ECU was removed and first underwent visual inspection, then the electronic detonator initiator was used to inspect its components for damage, and the damaged areas were recorded. A signal transmission line transmitted the energy storage signal inside the ECU to the oscilloscope, which recorded the transient changes in the internal energy storage of the ECU under shock wave. In this example, a water-resistant and interference-resistant signal transmission line was used, and a Tektronix MDO3034 oscilloscope was selected.

[0041] S5: Determine the shock wave resistance performance of the electronic control module under test. The empirical formula for testing the shock wave resistance performance of the electronic control module under test is as follows:

[0042] P m =48.99(Q) 1 / 3 / R) 1.45

[0043] In the formula: P m The peak pressure is represented by MPa; Q is the weight of the explosive charge used in this experiment, kg; and R is the distance between the tested electronic control module and the center of the explosive charge, m. This example uses the peak pressure of the explosion shock wave, P... m As a quantitative indicator to measure the shock wave resistance performance of the tested electronic control module.

[0044] The shock wave resistance performance data of the electronic control module used in a certain X-type electronic detonator, measured according to the above test procedure, are shown in Table 1. The charging voltage of the electronic control module used in the X-type electronic detonator is 22.5V, and the rated capacity of the energy storage capacitor used for ignition of the detonator is 100μF.

[0045] Table 1. Test results of shock wave resistance of a certain X-type electronic control module.

[0046]

[0047] Table 1 shows that the shock wave resistance (damage) pressure of a certain type X electronic control module ranges from 123.97 to 181.36 MPa, but its shock wave voltage loss resistance ranges from 36.87 to 66.38 MPa, making it more prone to shock-induced voltage loss. At a shock wave pressure of 123.97 MPa, although the sample tested normal after the shock, its voltage loss ratio was as high as 69.1%, and its remaining energy was only 7.8 mJ (lower than the ignition energy of 8.8 mJ), which may lead to detonator misfire. This example provides experimental data for manufacturers to improve product structure and enhance product performance.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. Method for testing the resistance to shock waves of an electronic control module for electronic detonators, characterized in that, The steps are as follows: S1: Preparation of the sample to be tested The electronic detonator initiator, which is matched with the electronic control module under test, is used to test it. After the test is normal, it is installed in a housing with openings at both ends, and the detonation wire and signal transmission line are led out from the two ends respectively. S2: Fixation of the sample being tested The electronic control module sample to be tested and the explosive charge are fixed in a steel frame and kept in a straight line. Then the distance L between the electronic control module sample and the explosive charge is adjusted to control the intensity of the shock wave received by the electronic control module sample. Then the steel frame is placed in the explosion water tank. S3: Delay Time Setting and Detonation The explosive charge was detonated using a detonator identical to that of the electronic control module sample under test. The detonator and the electronic control module under test were connected to the same busbar, and the detonation was carried out on the same network. The signal transmission line was connected to an oscilloscope. S4: Data Collection and Processing The tested electronic control module was removed after the impact, and the changes in its appearance and structure were observed. Damage detection of its internal components was performed using an electronic detonator initiator. The waveform changes of its energy storage under the instantaneous action of the shock wave were acquired using an oscilloscope. S5: Determine the shock wave resistance of the tested electronic control module.

2. The method according to claim 1, wherein, The two ends of the shell in S1 are sealed with silicone for waterproofing.

3. The method according to claim 1, wherein, The explosive charge in S2 is a TNT, RDX, or HMX compressed explosive column.

4. The method according to claim 3, wherein, The explosive charge weighs 12-18g.

5. The method according to claim 1, wherein, The center of the explosive charge in S2 is submerged in water to a depth of 1-1.4m.

6. The method according to claim 1, wherein, The delay interval between the detonator and the tested electronic control module shall not be less than 100ms.

7. The method according to claim 1, wherein, The oscilloscope in S4 is a Tektronix MDO3034 oscilloscope.

8. The method of claim 1, wherein the method is characterized by: The empirical formula for testing the shock wave resistance performance of the electronic control module under test in S5 is as follows: P m = 48.99(Q 1 / 3 / R) 1.45 where: P m is the peak pressure, MPa; Q is the weight of the explosive charge used in the test, kg; and R is the distance from the center of the explosive charge to the electronic control module being tested, m.

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