Method and device for verifying and testing low-frequency safety of wireless through-the-earth detonation electronic detonator

Abstract

The invention relates to the technical field of electronic detonator testing, in particular to a wireless through-the-earth detonation electronic detonator low-frequency safety verification testing method and device, and the method comprises the following steps: calling a safety testing strategy corresponding to a detonator ignition testing type; according to a safety test strategy corresponding to the detonator ignition test type, an ignition element in the wireless through-the-earth detonation electronic detonator corresponding to the test is tested, and the ignition voltage when the ignition probability corresponding to the ignition element is 50% and the ignition voltage when the ignition probability is 99.99% are determined; calling a safety test strategy corresponding to the magnetic field radiation sensitivity test type; and testing the ignition element according to a safety test strategy corresponding to the magnetic field radiation sensitivity test type, judging whether the ignition element is ignited or not in the test process based on the determined ignition voltage when the ignition probability of the ignition element is 50% and the ignition voltage when the ignition probability is 99.99%, and recording a test result.

Description

Technical Field

[0001] The invention relates to the technical field of electronic detonator testing, and in particular to a low-frequency safety verification test method and device for wireless through-the-ground detonating electronic detonators. Background Art

[0002] In recent years, with the advancement of science and technology and the improvement of industrial automation levels, electronic detonators have been increasingly used in mining, construction and other fields. Traditional wired detonation methods have many limitations, such as complex wiring and susceptibility to electromagnetic interference. In contrast, wireless electronic detonators have the advantages of simple wiring, strong anti-interference ability and high precision, so they are favored by the market. However, wireless signals will be attenuated and interfered to varying degrees when transmitted in underground environments, which poses a challenge to the safety and reliability of the ignition components of wireless electronic detonators. Therefore, it is essential to conduct safety verification tests on the corresponding ignition components.

[0003] The safety test of the existing ignition element of the electronic detonator is mainly to test the thermal stability of the ignition element, that is, to evaluate the performance of the ignition element under different temperature conditions.

[0004] The applicant has developed a new type of wireless electronic detonator, but the existing safety test of the ignition element cannot meet the safety test requirements of the ignition element of the new type of wireless electronic detonator, that is, it is impossible to accurately and reliably perform a low-frequency safety verification test on the ignition element of the new type of wireless electronic detonator. Summary of the invention

[0005] One of the purposes of the present invention is to provide a low-frequency safety verification test method and device for wireless through-the-ground detonating electronic detonators, which can realize low-frequency safety verification test on the ignition element of a new type of wireless electronic detonator, greatly improving the reliability and accuracy of the safety test.

[0006] In order to achieve the above object, a low-frequency safety verification test method for wireless through-the-ground detonating electronic detonator is provided, comprising the following steps:

[0007] S1. Determine the wireless through-the-ground electronic detonator corresponding to this test;

[0008] S2. Select the low-frequency safety test type as the detonator ignition test type, and retrieve the safety test strategy corresponding to the detonator ignition test type;

[0009] S3. According to the safety test strategy corresponding to the retrieved detonator ignition test type, the ignition element in the wireless through-the-ground electronic detonator corresponding to this test is tested, and the ignition voltage U corresponding to the ignition element when the ignition probability is 50% is determined. 50 And the ignition voltage U when the ignition probability is 99.99%99.99 ;

[0010] S4. Select the low-frequency safety test type as the magnetic field radiation sensitivity test type, and retrieve the safety test strategy corresponding to the magnetic field radiation sensitivity test type;

[0011] S5. According to the safety test strategy corresponding to the magnetic field radiation sensitivity test type, the ignition element in the wireless ground-penetrating electronic detonator corresponding to this test is tested, and the ignition voltage U corresponding to the ignition element when the ignition probability is 50% is determined. 50 And the ignition voltage U when the ignition probability is 99.99% 99.99 , determine whether the ignition element ignites during the test and whether premature explosion occurs, and record the test results.

[0012] Technical principle and effect of this scheme: In this scheme, first determine the wireless through-the-ground detonating electronic detonator corresponding to this test, then select the corresponding low-frequency safety test type in turn, first select the detonator ignition test type, and call the safety test strategy corresponding to the detonator ignition test type; test the ignition element of the detonator according to the test strategy to find the ignition voltage threshold U under different probabilities (such as 50% and 99.99%) 50 and U 99.99 .

[0013] Then select another test type, select the low-frequency safety test type as the magnetic field radiation sensitivity test type, and call the safety test strategy corresponding to the magnetic field radiation sensitivity test type. According to the safety test strategy corresponding to the magnetic field radiation sensitivity test type, test the ignition element in the wireless ground-penetrating electronic detonator corresponding to this test. During the test, use the ignition voltage threshold U obtained under different probabilities (such as 50% and 99.99%) before 50 and U 99.99 , test whether the ignition element of the wireless through-the-ground electronic detonator will accidentally ignite and ignite in a magnetic field radiation environment, resulting in premature explosion, and record the test results.

[0014] 1. In this scheme, two types of tests are used to test the ignition voltage threshold U under different probabilities (such as 50% and 99.99%). 50 and U 99.99 The determination of whether premature explosion will occur in the corresponding magnetic field radiation environment can be achieved, thereby realizing multi-directional testing of wireless through-the-ground detonating electronic detonators under excessively low ignition voltage or external magnetic field interference. Through testing, potential premature explosions can be prevented, and the risks caused by misoperation or other unexpected events can be reduced. Low-frequency safety verification testing of the ignition components of new wireless electronic detonators can be achieved, greatly improving the reliability and accuracy of safety testing.

[0015] 2. Simultaneously pass the ignition voltage threshold U with different probabilities (such as 50% and 99.99%) 50 and U 99.99 The ignition voltage of the wireless through-the-ground detonating electronic detonator can be quantified, and the triggering characteristics of the wireless through-the-ground detonating electronic detonator can be understood, thereby enhancing the reliability of the wireless through-the-ground detonating electronic detonator.

[0016] Furthermore, the wireless through-the-ground detonating electronic detonator corresponding to this test includes a signal receiving mechanism, a detonating mechanism and a quick connection mechanism;

[0017] The signal receiving mechanism comprises a first housing, in which a wireless communication module, a power module, and a first control module are arranged in sequence from left to right; a dip switch is arranged on the outer wall of the first housing;

[0018] The first control module is electrically connected to the wireless communication module, the power module and the DIP switch respectively;

[0019] The detonation mechanism comprises a second shell, in which a second control module and an ignition element are arranged, and the second control module is electrically connected to the ignition element;

[0020] The first control module is electrically connected to the second control module via a quick connection mechanism;

[0021] The wireless communication module includes a third control module, the input end of the third control module is connected to a second capacitor and a magnetic rod antenna in sequence, the output end of the third control module is connected to the input end of the first control module, and the third control module is electrically connected to the power supply module.

[0022] Beneficial effects: In this solution, the assembly of the corresponding electronic detonator detonating device is realized through the signal receiving mechanism, the detonating mechanism and the quick connection mechanism. Specifically, the first controller of the signal receiving mechanism is used to set the borehole coding through the dial switch. The first control module in the signal receiving mechanism receives the control instruction through the wireless communication module, and the control instruction is a low-frequency electromagnetic wave instruction. The first control module is used to send a control signal to the second control module of the detonating mechanism according to the control instruction. The second control module controls the ignition module through the received control signal, thereby realizing the remote detonation function of the electronic detonator.

[0023] 1. The system is divided into two main parts: signal receiving mechanism and detonating mechanism, which are connected by a quick connection mechanism. This modular design facilitates maintenance and upgrading, and also improves the overall flexibility of the system.

[0024] 2. The signal receiving mechanism enables the device to realize wireless communication in an underground environment through the setting of the wireless communication module, which provides great convenience for underground engineering, mine blasting and other work. Wireless ground-penetrating communication technology overcomes the limitations of traditional wired communication under complex geological conditions. The close cooperation between the first control module and the second control module ensures the accuracy of signal transmission and the safety and controllability of the detonation process. This design can effectively avoid the occurrence of accidental explosions and other safety accidents.

[0025] 3. The DIP switch allows users to configure different parameters according to specific needs, such as blasthole coding settings, to achieve a more flexible control method. This is very useful for distinguishing and managing multiple detonators in parallel operation.

[0026] The magnetic rod antenna receives the external wireless signal, and the signal is sent to the third control module after being filtered by the second capacitor. The third control module decodes the received signal and processes it into a digital signal. The decoded signal is sent to the first control module through the output end of the third control module. The first control module performs corresponding actions according to the received information, such as controlling the boost circuit.

[0027] At the same time, the magnetic rod antenna receives low-frequency electromagnetic wave detonation instructions. Within the detonation frequency range, there is less electromagnetic signal interference, which improves safety.

[0028] Using a magnetic rod antenna can improve the quality of signal reception and reduce the possibility of misoperation. Wireless signal transmission avoids the security risks that may be caused by wired connections.

[0029] The second capacitor can filter out noise signals to ensure that the third control module receives clean signals. The wireless communication module is connected to the power module to ensure a stable power supply and reliable operation even in harsh environments. The wireless communication module reduces dependence on physical lines, reducing installation costs and subsequent maintenance costs.

[0030] Furthermore, the safety test strategy corresponding to the detonator ignition test type includes the following steps:

[0031] S300, initializing the number of attempts corresponding to this test, as well as the initial value and step length of the charging voltage;

[0032] S301, connecting the input end corresponding to the ignition element in a wireless through-the-ground detonating electronic detonator corresponding to this test to the current output end of the test device, and placing the connected ignition element in an explosion-proof box;

[0033] The test device includes a DC regulated power supply, a double switch, a fourth switch, a double-throw mercury switch, a first wire-wound variable resistor, a fixed resistor, a second wire-wound variable resistor, a voltmeter, a resistance meter, and an electrolytic capacitor;

[0034] The positive terminal of the DC regulated power supply is connected to one contact of the double switch, and the negative terminal of the DC regulated power supply is connected to the other contact of the double switch and is grounded;

[0035] The two contacts of the double switch are respectively connected to the output end and the input end of the first wire-wound variable resistor, the middle tap of the first wire-wound variable resistor is connected to one end of the fixed resistor; the middle tap of the first wire-wound variable resistor and the fixed resistor are connected to one end of a voltmeter, and the other end of the voltmeter is grounded;

[0036] The other end of the fixed resistor is connected to the first static contact of the double-throw mercury switch, the moving contact of the double-throw mercury switch is connected to one end of the electrolytic capacitor, and the other end of the electrolytic capacitor is grounded; the second static contact of the double-throw mercury switch is connected to the input end of the second wire-wound variable resistor, and the middle tap of the second wire-wound variable resistor is the first current output end;

[0037] One end of a fourth switch is connected between the second static contact and the second wire-wound variable resistor, the other end of the fourth switch is connected to one end of an ohmmeter, the other end of the ohmmeter is grounded and is a corresponding second current output end;

[0038] S302, closing the fourth switch, adjusting the middle tap of the second wire-wound variable resistor so that the reading of the resistance meter is a preset resistance value, and then opening the fourth switch;

[0039] S303, turning on the double switch, adjusting the middle tap of the first winding rheostat, charging the electrolytic capacitor to a preset initial value of the charging voltage, at which time the first static contact of the double-throw mercury switch is connected to the moving contact, and then adjusting the moving contact of the double-throw mercury switch so that the moving contact is connected to the second static contact, at which time the electrolytic capacitor discharges the ignition element;

[0040] S304, when the electrolytic capacitor discharges the ignition element, record whether the ignition element ignites, if so, when the next ignition element is tested, the corresponding charging voltage is reduced by one step, otherwise it is increased by one step;

[0041] S305, repeating S301 to S304 until a preset number of trials is met;

[0042] S306: After the preset number of trials is met, the corresponding test data is collected, and based on the collected test data, the ignition voltage U when the ignition probability is 50% is determined. 50 And the ignition voltage U when the ignition probability is 99.99% 99.99 .

[0043] Beneficial effects: In this scheme, the ignition element is connected to the test device and placed in an explosion-proof box to ensure safety, and then the electrolytic capacitor in the test device is charged and discharged. During the discharge of the electrolytic capacitor, it is recorded whether the ignition element ignites. The charging voltage of the next experiment is adjusted according to the ignition situation, and the above steps are repeated until the preset number of trials is reached. Collect all test data and analyze the ignition voltage thresholds under different probabilities.

[0044] By gradually adjusting the charging voltage and observing the ignition situation, the ignition voltage under different ignition probabilities can be accurately found, which is crucial to ensure the reliability and safety of detonators. A set of standardized test processes has been established to make the test results more comparable and reliable, facilitating quality control of different batches of products.

[0045] Furthermore, the safety test strategy corresponding to the magnetic field radiation sensitivity test type includes the following steps:

[0046] S50, placing the wireless ground-penetrating electronic detonator in the protective device, and then directly connecting the ignition element in the wireless ground-penetrating electronic detonator to the oscilloscope;

[0047] S51, a corresponding radiation generating device is arranged near the wireless through-the-ground detonating electronic detonator, the radiation generating device comprises a signal generator and a radiation loop antenna connected to the output end of the signal generator, a measuring receiver is connected between the radiation loop antenna and the signal generator via a current probe; the measuring receiver is used to measure the current value corresponding to the radiation loop antenna via the current probe;

[0048] S52, adjust the signal generator to 1kHz and adjust the output to produce a magnetic flux density of 110dBpT;

[0049] S53, disposing the radiation loop antenna of the radiation generating device at a preset distance on the surface of the magnetic rod antenna corresponding to the wireless through-the-ground detonating electronic detonator, and the surface of the radiation loop antenna is disposed parallel to the surface of the wireless through-the-ground detonating electronic detonator;

[0050] S54, applying current to the radiating loop antenna so that a magnetic field strength 10 dB greater than the selected limit corresponding to the current frequency is generated and the current value measured by the measuring receiver does not exceed 19A; the magnetic field strength is determined by measuring the current value through the current probe of the measuring receiver and the conversion coefficient of the radiating antenna, and the conversion coefficient is 9.5×10 7 pT / A;

[0051] S55. At the same position, the output frequency of the signal generator is adjusted within the frequency range of 1 kHz to 10 kHz and the radiating loop antenna is used to scan the magnetic rod antenna in the wireless ground penetrating electronic detonator;

[0052] S56. During the scanning process, the voltage value of the oscilloscope is monitored in real time. If the voltage increases, the frequency value corresponding to the increase in voltage is defined as a sensitive frequency point, and three frequency test points are selected per octave at the sensitive frequency point;

[0053] S57, changing the position of the radiating loop antenna so that the radiating loop antenna moves to different areas on each surface of the magnetic rod antenna, and when moving to different areas on each surface of the magnetic rod antenna, repeatedly performing S55 to S56 until all sensitive frequency points corresponding to different areas on each surface of the magnetic rod antenna are recorded, and three frequency test points corresponding to each sensitive frequency point are selected;

[0054] S58, forming a corresponding frequency test point set according to the three frequency test points corresponding to each selected sensitive frequency point, and applying corresponding limiting current to the radiating loop antenna based on each frequency test point in the frequency test point set, while keeping the distance between the radiating loop antenna and the surface of the magnetic rod antenna at a preset distance, moving the radiating loop antenna, determining the sensitive point corresponding to each frequency test point, and judging whether the oscilloscope voltage corresponding to the sensitive point is at U 50 To U 99.99 If yes, it is judged that it is caused by magnetic field interference and premature explosion occurs.

[0055] Beneficial effect: In this scheme, by adjusting the output frequency of the signal generator within the frequency range of 1kHz to 10kHz and using the radiation loop antenna to scan the magnetic rod antenna, the sensitivity of the wireless ground-penetrating electronic detonator to magnetic fields of different frequencies can be accurately identified. During the scanning process, the voltage value change of the oscilloscope is monitored in real time, and the frequency value corresponding to the voltage increase, that is, the sensitive frequency point, is recorded, thereby realizing the accurate identification of the sensitive frequency points of the wireless ground-penetrating electronic detonator.

[0056] Change the position of the radiating loop antenna to move it to different areas on each side of the ferrite rod antenna to ensure that the test covers all possible sensitive areas. Repeat the test in different areas on each side of the ferrite rod antenna, and record all sensitive frequency points to ensure comprehensive evaluation results.

[0057] Secondly, the current value is measured by measuring the receiver and current probe, and the magnetic field strength is calculated in combination with the conversion coefficient, so that the test results are quantifiable. Based on each frequency test point in the frequency test point set, the corresponding limiting current is applied to ensure the consistency and reliability of the test results. Through the test, sensitive frequency points that may cause premature detonation can be found, so that corresponding measures can be taken to avoid accidental detonation in actual use.

[0058] The present invention also provides a low-frequency safety verification and testing device for wireless through-the-ground detonating electronic detonators, which uses the above-mentioned low-frequency safety verification and testing method for wireless through-the-ground detonating electronic detonators. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 This is a flow chart of a low-frequency safety verification test method for wireless through-the-earth detonating electronic detonators in Embodiment 1 of the present invention;

[0060] Figure 2 This is a logic block diagram of a wireless through-the-ground detonating electronic detonator in Embodiment 1 of the present invention;

[0061] Figure 3 is a schematic diagram of a signal receiving mechanism in Embodiment 1 of the present invention;

[0062] Figure 4 This is a schematic diagram of the detonation mechanism in the first embodiment of the present invention.

[0063] Figure 5 This is a circuit diagram of the connection between the test device and the ignition element in Example 1 of the present invention.

[0064] Figure 6 This is a limit value coordinate diagram for magnetic field density selection in the first embodiment of the present invention. DETAILED DESCRIPTION

[0065] The following is further described in detail through specific implementation methods:

[0066] Embodiment 1

[0067] A low-frequency safety verification test method for wireless ground-penetrating electronic detonators is basically as follows: Figure 1 As shown, the following steps are included:

[0068] S1. Determine the wireless through-the-earth detonating electronic detonator corresponding to this test; the wireless through-the-earth detonating electronic detonator corresponding to this test includes a signal receiving mechanism, a detonating mechanism and a quick connection mechanism;

[0069] like Figure 2 , Figure 3 , Figure 4As shown, the signal receiving mechanism includes a first shell, in which a wireless communication module, a power module, and a first control module are arranged in sequence from left to right; a dip switch is arranged on the outer wall of the first shell;

[0070] The first control module is electrically connected to the wireless communication module, the power module and the DIP switch respectively;

[0071] The detonation mechanism comprises a second shell, in which a second control module and an ignition element are arranged, and the second control module is electrically connected to the ignition element;

[0072] The first control module is electrically connected to the second control module via a quick connection mechanism;

[0073] The wireless communication module includes a third control module, the input end of the third control module is connected to a second capacitor and a magnetic rod antenna in sequence, the output end of the third control module is connected to the input end of the first control module, and the third control module is electrically connected to the power supply module.

[0074] In this embodiment, the quick connection mechanism includes a third shell, which is a cylindrical metal shell. A plug is arranged in the third shell, a socket is arranged on the right side wall of the first shell, a threaded portion is arranged on the outer wall of the plug, and a threaded hole matching the threaded portion is arranged in the socket. A conductive electric contact is arranged in the threaded hole, and the conductive electric contact is connected to the first control module. After the plug is inserted into the threaded hole, the plug contacts the conductive electric contact, thereby realizing the fixation and electrical connection between the signal receiving mechanism and the detonating mechanism.

[0075] The first control module includes a first single-chip microcomputer, the input end of the first single-chip microcomputer is connected to the wireless communication module and the power supply module respectively, and the output end of the first single-chip microcomputer is connected to the boost circuit;

[0076] The boost circuit includes a third resistor R3 connected to the output end of the first single-chip computer, and the other end of the third resistor R3 is connected to the gate of the first MOS tube; the source of the first MOS tube is grounded, the drain of the first MOS tube is connected to the fourth resistor and the anode of the third diode at the same time, the cathode of the third diode and the other end of the fourth resistor are connected to the first switch at the same time, the other end of the first switch is respectively connected to the inductor and the source of the second MOS tube, the other end of the inductor is connected to the fifth resistor, the other end of the fifth resistor is connected to the gate of the second MOS tube, the drain of the second MOS tube is connected to the input end of the inductor, and the output end of the inductor is connected to the second control module of the detonation mechanism.

[0077] The second control module in the detonation mechanism includes a first resistor connected to the output end of the inductor and a second resistor connected to the output end of the first single-chip microcomputer, a bidirectional breakdown third diode and a bridge rectifier circuit are arranged in parallel between the first resistor and the second resistor; two AC input ends of the bridge rectifier circuit are respectively connected to the first resistor and the second resistor, and two DC output ends of the bridge rectifier circuit are connected to two input ends of the second single-chip microcomputer of the second control module;

[0078] A second switch, a fourth diode, a third resistor, a fourth resistor, a third switch, an ignition element and a first capacitor are arranged between the two output ends of the second single-chip microcomputer; the second switch, the fourth diode, the third resistor and the first capacitor are arranged in series in sequence, the first capacitor is arranged in parallel with the fourth resistor and the third switch arranged in series, the ignition element is arranged in parallel with the third switch, and ignition gunpowder is arranged on the ignition element. The working principle of the wireless ground-penetrating electronic detonator is as follows: the power module is charged through the charging interface so that the power of the power module can meet the needs of the device, and then the first controller in the signal receiving mechanism is used to set the blasthole code through the dial switch, and other devices are connected through the communication interface to set the blasting parameters in the first single-chip microcomputer.

[0079] After that, the entire detonating device is placed in the blast hole, the magnetic rod antenna receives the low-frequency electromagnetic wave charging signal instruction, and the low-frequency electromagnetic wave charging signal instruction is demodulated by the third single-chip microcomputer in the wireless communication module, and the corresponding analog signal is converted into a digital signal through A / D conversion, and then communicates with the first single-chip microcomputer in the control module. After receiving the corresponding digital signal, the first single-chip microcomputer will judge the received digital signal and judge whether to charge. If charging is performed, the first single-chip microcomputer outputs a high level through the output end, the third diode is turned on, the first switch is attracted, the normally open contact is demodulated, the boost circuit is turned on for boosting, and at the same time the second switch is turned on, and the boost current charges the first capacitor through the first resistor, the fourth diode and the third resistor.

[0080] Afterwards, the magnetic rod antenna receives the corresponding low-frequency electromagnetic wave detonation signal instruction, demodulates the low-frequency electromagnetic wave detonation signal instruction through the third single-chip microcomputer in the wireless communication module, and converts the corresponding analog signal into a digital signal through A / D conversion, and then communicates with the first single-chip microcomputer in the control module. After receiving the corresponding digital signal, the first single-chip microcomputer will judge the received digital signal to determine whether to detonate. If so, the first single-chip microcomputer will time through the delay module it carries, for example 100ms, and then the first single-chip microcomputer will output a low level through the output end after reaching the preset time, and turn on the first switch to discharge the first capacitor, and the bridge wire will ignite the ignition gunpowder to achieve the detonation of the electronic detonator.

[0081] If the first capacitor has been fully charged, a discharge instruction is received, the third switch is turned on, and the energy on the first capacitor is released to achieve a detonation operation.

[0082] S2. Select the low-frequency safety test type as the detonator ignition test type, and retrieve the safety test strategy corresponding to the detonator ignition test type;

[0083] S3. According to the safety test strategy corresponding to the retrieved detonator ignition test type, the ignition element in the wireless through-the-ground electronic detonator corresponding to this test is tested, and the ignition voltage U corresponding to the ignition element when the ignition probability is 50% is determined. 50 And the ignition voltage U when the ignition probability is 99.99% 99.99 ;

[0084] The safety test strategy corresponding to the detonator ignition test type includes the following steps:

[0085] S300, initializing the number of attempts corresponding to this test, as well as the initial value and step length of the charging voltage; in this embodiment, the number of attempts is set to 40.

[0086] S301, connecting the input end corresponding to the ignition element in a wireless through-the-ground detonating electronic detonator corresponding to this test to the current output end of the test device, and placing the connected ignition element in an explosion-proof box;

[0087] like Figure 5 As shown, the test device includes a DC regulated power supply E, a double switch K1, a fourth switch K2, a double-throw mercury switch K3, a first wire-wound variable resistor R7, a fixed resistor R8, a second wire-wound variable resistor R9, a voltmeter, a resistance meter, and an electrolytic capacitor C4; D in the figure is an ignition element;

[0088] The positive terminal of the DC regulated power supply E is connected to one contact of the double switch K1, and the negative terminal of the DC regulated power supply E is connected to the other contact of the double switch K1 and is grounded;

[0089] The two contacts of the double switch K1 are respectively connected to the output end and the input end of the first wire-wound variable resistor R7, and the middle tap of the first wire-wound variable resistor R7 is connected to one end of the fixed resistor R8; one end of a voltmeter is connected between the middle tap of the first wire-wound variable resistor R7 and the fixed resistor R8, and the other end of the voltmeter is grounded;

[0090] The other end of the fixed resistor R8 is connected to the first static contact of the double-throw mercury switch K3, the moving contact of the double-throw mercury switch K3 is connected to one end of the electrolytic capacitor C4, and the other end of the electrolytic capacitor C4 is grounded; the second static contact of the double-throw mercury switch K3 is connected to the input end of the second wire-wound resistor R9, and the middle tap of the second wire-wound resistor R9 is the first current output end;

[0091] One end of a fourth switch K2 is connected between the second static contact and the second wire-wound variable resistor R9, the other end of the fourth switch K2 is connected to one end of an ohmmeter, the other end of the ohmmeter is grounded and is the corresponding second current output end;

[0092] S302, close the fourth switch K2, adjust the middle tap of the second wire-wound variable resistor R9 so that the reading of the resistance meter is a preset resistance value, and then open the fourth switch K2; in this embodiment, the preset resistance value is 10Ω. Of course, when the resistance of the tested sample is greater than or equal to 10Ω, a discharge resistor larger than the resistance of the tested sample should be selected.

[0093] S303, turn on the double switch K1, adjust the middle tap of the first winding rheostat R7, charge the electrolytic capacitor C4 to a preset initial value of the charging voltage, at which time the first static contact of the double-throw mercury switch K3 is connected to the moving contact, and then adjust the moving contact of the double-throw mercury switch K3 so that the moving contact is connected to the second static contact, at which time the electrolytic capacitor C4 discharges the ignition element;

[0094] S304, when the electrolytic capacitor C4 discharges the ignition element, record whether the ignition element is ignited, if so, when the next ignition element is tested, the corresponding charging voltage is reduced by one step, otherwise it is increased by one step;

[0095] S305, repeating S301 to S304 until a preset number of trials is met;

[0096] S306: After the preset number of trials is met, the corresponding test data is collected, and based on the collected test data, the ignition voltage U when the ignition probability is 50% is determined. 50 And the ignition voltage U when the ignition probability is 99.99% 99.99 .

[0097] In this embodiment, the ignition voltage and the sample standard deviation S when the ignition probability is 50% are calculated based on the collected test data. The specific calculation formula is:

[0098]

[0099] In the formula, is the ignition stimulus when the probability of ignition is 50%, x0 is the minimum stimulus corresponding to i equal to 0, d is the step size, A is the statistic, N is the effective sample size, and i is the sequence number of the arithmetic progression formed by the stimulus levels of each test;

[0100]

[0101] In the formula, S is the sample standard deviation, A and B are statistics;

[0102] The calculation of the upper and lower limits of the irritation stimulus is:

[0103]

[0104] In the formula, X P U is the upper and lower limits of the irritation stimulus, P To correspond to the ignition voltage, a positive value is taken when calculating the upper limit of the ignition stimulation amount, and a negative value is taken when calculating the lower limit of the ignition stimulation amount.

[0105] S4. Select the low-frequency safety test type as the magnetic field radiation sensitivity test type, and retrieve the safety test strategy corresponding to the magnetic field radiation sensitivity test type;

[0106] S5. According to the safety test strategy corresponding to the magnetic field radiation sensitivity test type, the ignition element in the wireless ground-penetrating electronic detonator corresponding to this test is tested, and the ignition voltage U corresponding to the ignition element when the ignition probability is 50% is determined. 50 And the ignition voltage U when the ignition probability is 99.99% 99.99 , determine whether the ignition element ignites during the test and whether premature explosion occurs, and record the test results.

[0107] The safety test strategy corresponding to the magnetic field radiation sensitivity test type includes the following steps:

[0108] S50, placing the wireless ground-penetrating electronic detonator in the protective device, and then directly connecting the ignition element in the wireless ground-penetrating electronic detonator to the oscilloscope;

[0109] S51, a corresponding radiation generating device is arranged near the wireless through-the-ground detonating electronic detonator, the radiation generating device comprises a signal generator and a radiation loop antenna connected to the output end of the signal generator, a measuring receiver is connected between the radiation loop antenna and the signal generator via a current probe; the measuring receiver is used to measure the current value corresponding to the radiation loop antenna via the current probe;

[0110] S52, adjust the signal generator to 1kHz and adjust the output to produce a magnetic flux density of 110dBpT;

[0111] S53. The radiation loop antenna of the radiation generating device is arranged at a preset distance on the surface of the magnetic rod antenna corresponding to the wireless ground-penetrating electronic detonator, and the surface of the radiation loop antenna is arranged parallel to the surface of the wireless ground-penetrating electronic detonator; in this embodiment, the preset distance is 5 cm.

[0112] S54, applying current to the radiating loop antenna so that a magnetic field strength 10 dB greater than the selected limit corresponding to the current frequency is generated and the current value measured by the measuring receiver does not exceed 19A; the magnetic field strength is determined by measuring the current value through the current probe of the measuring receiver and the conversion coefficient of the radiating antenna, and the conversion coefficient is 9.5×10 7 pT / A; e.g. Figure 6 As shown, in this embodiment, within the frequency range of 1 kHz to 10 kHz, each frequency point corresponds to a magnetic field density selection limit value.

[0113] S55. At the same position, the output frequency of the signal generator is adjusted within the frequency range of 1 kHz to 10 kHz and the radiating loop antenna is used to scan the magnetic rod antenna in the wireless ground penetrating electronic detonator;

[0114] S56. During the scanning process, the voltage value of the oscilloscope is monitored in real time. If the voltage increases, the frequency value corresponding to the increase in voltage is defined as a sensitive frequency point, and three frequency test points are selected per octave at the sensitive frequency point; for example, when scanning in a certain area, within the scanning range of 1khz to 10khz, the increase is performed in steps of 1khz. If the oscilloscope voltage increases at 7khz, then 6khz to 7khz is selected, and 6.3khz, 6.6khz, and 6.9khz are refined to see whether the voltage change exceeds the voltage at the 7khz position to determine the sensitive point. In this embodiment, 1khz is used as the frequency range.

[0115] S57, change the position of the radiating loop antenna so that the radiating loop antenna moves to different areas on each surface of the magnetic rod antenna. When moving to different areas on each surface of the magnetic rod antenna, repeat S55 to S56 until all sensitive frequency points corresponding to different areas on each surface of the magnetic rod antenna are recorded, and three frequency test points corresponding to each sensitive frequency point are selected; in this embodiment, each surface of the magnetic antenna must be scanned, and different areas are set on each surface, and the size of each area is 30cm×30cm. Of course, in this embodiment, the electrical connection of the two mechanisms in the wireless ground-penetrating electronic detonator through the quick connection mechanism will also be tested, and multiple frequencies of multiple surfaces will also be scanned.

[0116] S58, forming a corresponding frequency test point set according to the three frequency test points corresponding to each selected sensitive frequency point, and applying corresponding limiting current to the radiating loop antenna based on each frequency test point in the frequency test point set, while keeping the distance between the radiating loop antenna and the surface of the magnetic rod antenna at a preset distance, moving the radiating loop antenna, determining the sensitive point corresponding to each frequency test point, and judging whether the oscilloscope voltage corresponding to the sensitive point is at U 50 To U 99.99 If yes, it is judged that it is caused by magnetic field interference and premature explosion occurs.

[0117] This embodiment also discloses a low-frequency safety verification test device for wireless through-the-earth detonating electronic detonators, using the above-mentioned low-frequency safety verification test method for wireless through-the-earth detonating electronic detonators.

[0118] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is described too much here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can know all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A low-frequency safety verification test method for wireless through-the-ground electronic detonators, characterized in that: The following steps are involved: S1. Determine the wireless through-the-ground electronic detonator corresponding to this test; S2. Select the low-frequency safety test type as the detonator ignition test type, and retrieve the safety test strategy corresponding to the detonator ignition test type; S3. According to the safety test strategy corresponding to the retrieved detonator ignition test type, the ignition element in the wireless through-the-ground electronic detonator corresponding to this test is tested, and the ignition voltage U corresponding to the ignition element when the ignition probability is 50% is determined. 50 And the ignition voltage U when the ignition probability is 99.99% 99.99 ; S4. Select the low-frequency safety test type as the magnetic field radiation sensitivity test type, and retrieve the safety test strategy corresponding to the magnetic field radiation sensitivity test type; S5. According to the safety test strategy corresponding to the retrieved magnetic field radiation sensitivity test type, the ignition element in the wireless ground-penetrating electronic detonator corresponding to this test is tested, and the ignition voltage U corresponding to the ignition element when the ignition probability is 50% is determined. 50 And the ignition voltage U when the ignition probability is 99.99% 99.99 , determine whether the ignition element ignites during the test and whether premature explosion occurs, and record the test results.

2. A low-frequency safety verification test method for wireless through-the-earth detonating electronic detonators according to claim 1, characterized in that: The wireless through-the-ground detonating electronic detonator corresponding to this test includes a signal receiving mechanism, a detonating mechanism and a quick connection mechanism; The signal receiving mechanism comprises a first housing, in which a wireless communication module, a power module, and a first control module are arranged in sequence from left to right; a dip switch is arranged on the outer wall of the first housing; The first control module is electrically connected to the wireless communication module, the power module and the DIP switch respectively; The detonation mechanism comprises a second shell, in which a second control module and an ignition element are arranged, and the second control module is electrically connected to the ignition element; The first control module is electrically connected to the second control module via a quick connection mechanism; The wireless communication module includes a third control module, the input end of the third control module is connected to a second capacitor and a magnetic rod antenna in sequence, the output end of the third control module is connected to the input end of the first control module, and the third control module is electrically connected to the power supply module.

3. A low-frequency safety verification test method for wireless through-the-earth detonating electronic detonators according to claim 2, characterized in that: The safety test strategy corresponding to the detonator ignition test type includes the following steps: S300, initializing the number of attempts corresponding to this test, as well as the initial value and step length of the charging voltage; S301, connecting the input end corresponding to the ignition element in a wireless through-the-ground detonating electronic detonator corresponding to this test to the current output end of the test device, and placing the connected ignition element in an explosion-proof box; The test device includes a DC regulated power supply, a double switch, a fourth switch, a double-throw mercury switch, a first wire-wound variable resistor, a fixed resistor, a second wire-wound variable resistor, a voltmeter, a resistance meter, and an electrolytic capacitor; The positive terminal of the DC regulated power supply is connected to one contact of the double switch, and the negative terminal of the DC regulated power supply is connected to the other contact of the double switch and is grounded; The two contacts of the double switch are respectively connected to the output end and the input end of the first wire-wound variable resistor, the middle tap of the first wire-wound variable resistor is connected to one end of the fixed resistor; the middle tap of the first wire-wound variable resistor and the fixed resistor are connected to one end of a voltmeter, and the other end of the voltmeter is grounded; The other end of the fixed resistor is connected to the first static contact of the double-throw mercury switch, the moving contact of the double-throw mercury switch is connected to one end of the electrolytic capacitor, and the other end of the electrolytic capacitor is grounded; the second static contact of the double-throw mercury switch is connected to the input end of the second wire-wound variable resistor, and the middle tap of the second wire-wound variable resistor is the first current output end; One end of a fourth switch is connected between the second static contact and the second wire-wound variable resistor, the other end of the fourth switch is connected to one end of an ohmmeter, the other end of the ohmmeter is grounded and is a corresponding second current output end; S302, closing the fourth switch, adjusting the middle tap of the second wire-wound variable resistor so that the reading of the resistance meter is a preset resistance value, and then opening the fourth switch; S303, turning on the double switch, adjusting the middle tap of the first winding rheostat, charging the electrolytic capacitor to a preset initial value of the charging voltage, at which time the first static contact of the double-throw mercury switch is connected to the moving contact, and then adjusting the moving contact of the double-throw mercury switch so that the moving contact is connected to the second static contact, at which time the electrolytic capacitor discharges the ignition element; S304, when the electrolytic capacitor discharges the ignition element, record whether the ignition element ignites, if so, when the next ignition element is tested, the corresponding charging voltage is reduced by one step, otherwise it is increased by one step; S305, repeating S301 to S304 until a preset number of trials is met; S306: After the preset number of trials is met, the corresponding test data is collected, and based on the collected test data, the ignition voltage U when the ignition probability is 50% is determined. 50 And the ignition voltage U when the ignition probability is 99.99% 99.99 .

4. A low-frequency safety verification test method for wireless through-the-earth detonating electronic detonators according to claim 3, characterized in that: The safety test strategy corresponding to the magnetic field radiation sensitivity test type includes the following steps: S50, placing the wireless ground-penetrating electronic detonator in the protective device, and then directly connecting the ignition element in the wireless ground-penetrating electronic detonator to the oscilloscope; S51, a corresponding radiation generating device is arranged near the wireless through-the-ground detonating electronic detonator, the radiation generating device comprises a signal generator and a radiation loop antenna connected to the output end of the signal generator, a measuring receiver is connected between the radiation loop antenna and the signal generator via a current probe; the measuring receiver is used to measure the current value corresponding to the radiation loop antenna via the current probe; S52, adjust the signal generator to 1kHz and adjust the output to produce a magnetic flux density of 110dBpT; S53, disposing the radiation loop antenna of the radiation generating device at a preset distance on the surface of the magnetic rod antenna corresponding to the wireless through-the-ground detonating electronic detonator, and the surface of the radiation loop antenna is disposed parallel to the surface of the wireless through-the-ground detonating electronic detonator; S54, applying current to the radiating loop antenna so that a magnetic field strength 10 dB greater than the selected limit corresponding to the current frequency is generated and the current value measured by the measuring receiver does not exceed 19A; the magnetic field strength is determined by measuring the current value through the current probe of the measuring receiver and the conversion coefficient of the radiating antenna, and the conversion coefficient is 9.5×10 7 pT / A; S55. At the same position, the output frequency of the signal generator is adjusted within the frequency range of 1 kHz to 10 kHz and the radiating loop antenna is used to scan the magnetic rod antenna in the wireless ground penetrating electronic detonator; S56. During the scanning process, the voltage value of the oscilloscope is monitored in real time. If the voltage increases, the frequency value corresponding to the increase in voltage is defined as a sensitive frequency point, and three frequency test points are selected per octave at the sensitive frequency point; S57, changing the position of the radiating loop antenna so that the radiating loop antenna moves to different areas on each surface of the magnetic rod antenna, and when moving to different areas on each surface of the magnetic rod antenna, repeatedly performing S55 to S56 until all sensitive frequency points corresponding to different areas on each surface of the magnetic rod antenna are recorded, and three frequency test points corresponding to each sensitive frequency point are selected; S58, forming a corresponding frequency test point set according to the three frequency test points corresponding to each selected sensitive frequency point, and applying corresponding limiting current to the radiating loop antenna based on each frequency test point in the frequency test point set, while keeping the distance between the radiating loop antenna and the surface of the magnetic rod antenna at a preset distance, moving the radiating loop antenna, determining the sensitive point corresponding to each frequency test point, and judging whether the oscilloscope voltage corresponding to the sensitive point is at U 50 To U 99.99 If yes, it is judged that it is caused by magnetic field interference and premature explosion occurs.

5. A wireless through-the-ground detonating electronic detonator low-frequency safety verification test device, characterized in that: A low-frequency safety verification test method for wireless through-the-earth electronic detonators using any one of claims 1 to 4 above.

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