CN1077278A - Indirect detector for bridge wire ignition resistance of electric detonator - Google Patents
Indirect detector for bridge wire ignition resistance of electric detonator Download PDFInfo
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- CN1077278A CN1077278A CN 92102279 CN92102279A CN1077278A CN 1077278 A CN1077278 A CN 1077278A CN 92102279 CN92102279 CN 92102279 CN 92102279 A CN92102279 A CN 92102279A CN 1077278 A CN1077278 A CN 1077278A
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- bridge wire
- circuit
- electric detonator
- resistance
- detonator
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Abstract
The invention relates to an indirect linear detector for bridge wire firing resistor of a common electric detonator, which consists of a detection signal amplifying circuit, an impedance display circuit, a constant current circuit, an undervoltage indicating circuit and a power supply. The method is characterized in that when the bridge wire firing resistance of the electric detonator is measured, a 1000 Hz constant current signal passes through a primary winding of a transformer type impedance converter to induce alternating current, finally, the voltage generated on the primary winding is changed in proportion to the bridge wire resistance value, and the voltage is amplified and displayed linearly to give the bridge wire firing resistance value of the electric detonator, so that the requirement of safety detection on the bridge wire firing resistance of the common electric detonator in an electric detonator factory and a blasting construction site can be met.
Description
The present invention is the indirect linearity test instrument of a kind of bridge wire of electric detonator resistance, belongs to the F42C class scope of International Patent Classification (IPC), is mainly used in electric cap factory, and safety detection is carried out to bridge wire ignition resistance of electric detonator in each blasting engineering place.
Both at home and abroad to the measurement of bridge wire ignition resistance of electric detonator, mainly be to adopt ohmmeter to carry out wiring at present, directly energising is measured, and detecting electric current can be up to the 30-50 milliampere.Advanced digital ohm meter also is that directly energising detects, and it detects electric current and also is not less than 4 milliamperes.
The bridge resistance measuring device for auget of Chinese patent application numbers 891076026 also can only detect the micro electromagnetic detonator bridge wire resistance of the integral high frequency transformer of preset parameter, and is not competent to the common electrical detonator.
Detect the problem that common electrical detonator bridge wire resistance instrument exists at present both at home and abroad, the one, directly energising detects, and is dangerous, and the 2nd, it is bigger than normal, also dangerous to detect electric current, and the 3rd, the resistance linearity of detector is undesirable.
For solving the linearity of safety detection common electrical bridge wire ignition resistance of detonator and detection resistance, special proposition bridge wire of electric detonator resistance indirect detector of the present invention.
The indirect safety detector of bridge wire ignition resistance of electric detonator of the present invention, shown in Fig. 1 dot-dash block diagram, be by sinusoidal current (1), current amplification circuit (2), double winding impedance conversion constant current testing circuit (3), detection signal amplifying circuit (4), impedance display circuit (5), constant-current control circuit (6), under-voltage indication (7), power supply (8) and output element (9) are formed, wherein circuit (1) is the integrated sinusoidal current of-1000 He Zhi, circuit (2) is the current mode discharge circuit, circuit (3) is the double winding impedance change detection circuit of transformer type constant current, circuit (4) detects amplifying circuit for current mode, circuit (5) is the microampere meter testing circuit in the current mode amplifier backfeed loop, circuit (6) is the FET constant-current control circuit, and circuit (7) is under-voltage indicating circuit, circuit (8) is that 9 volts of laminated batteries and circuit (9) are tested bridge wire of electric detonator resistance loop.
The invention is characterized in super power frequency (1000 He Zhi) the constant current testing circuit (3) that adopts the double winding impedance transformer that changes with the linear ratio of tested bridge wire of electric detonator resistance, the linear safety detector that passes through the common electrical bridge wire ignition resistance of detonator of circuit (4), (5), (6), (7) and (8) institute cascade composition.
The indirect safety detector of bridge wire of electric detonator resistance of the present invention is according to double winding impedance transformer (transformer conversion) output, and the linear principle of constant current detection impedance is made.According to Ohm's law as can be known, the electric current by measured resistance guarantees when constant, the variation that is in proportion of the size of the voltage drop value that produces on measured resistance and resistance value, the basic functional principle of Here it is this instrument.
Instrument operation principle of the present invention as shown in Figure 2, the testing process of detection bridge wire ignition resistance of electric detonator as shown in Figure 3, the bipod line end of electric cap (10) is received output A, the B end of impedance transformer (3), by alternating current source (1) when the interchange constant current il of defeated-1000 He Zhi of the elementary winding of converter, in the circuit of secondary windings and electric cap (10) bridge wire resistance (11) composition, along with the variation of bridge wire resistance value, can hold the proportional variation of voltage magnitude that reflects at C, the D of elementary winding.This voltage forms the resistance that shows bridge wire resistance linearly by testing circuit (4), (5), is by constant-current control circuit (6) for realizing constant current, detect the constant current offset signal from the C point after, finish with control circuit (2).
This detection method of the present invention is that detected bridge wire of electric detonator firing circuit and the inner dc source of detector do not have contacting directly of electricity, the harm that this dc source of just having eliminated detector may form bridge wire of electric detonator ignition loop.
The fault of any direct current in the inside of safety detector of the present invention or interchange can ignition bridge silk ignition resistance.Its highest detection electric current is not more than 500 microamperes, and is littler 100 times than the detection electric current (50 milliamperes) of conventional electric detonator detector, and the safety coefficient that detects has increased I
2Doubly (100
2), promptly improved 10,000 times.
Detector of the present invention has solved the safe linearity test problem of common electrical bridge wire ignition resistance of detonator.Its volume is little, is easy to carry, when being suitable for mine and engineering electric blasting, and the safe linearity test of common electrical bridge wire ignition resistance of detonator, it is fit to equally the safety detection less than 5 ohm network resistance.
Claims (1)
1, the present invention is made up of sinusoidal current [1], current amplification circuit [2], bridge wire ignition resistance of detonator change detection circuit [3], detection signal amplifying circuit [4], detonator bridge wire resistance display circuit [5], constant-current circuit [6], under-voltage indication [7], power supply [8] and output element [9], and the constant current testing circuit [3] of its special little super power frequency (1000 He Zhi) that is to adopt double winding silicon steel sheet impedance transformer is by the linear safety detector of the common electrical bridge wire ignition resistance of detonator of circuit [4], [5], [6], [7] and [8] cascade composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92102279 CN1077278A (en) | 1992-04-09 | 1992-04-09 | Indirect detector for bridge wire ignition resistance of electric detonator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92102279 CN1077278A (en) | 1992-04-09 | 1992-04-09 | Indirect detector for bridge wire ignition resistance of electric detonator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1077278A true CN1077278A (en) | 1993-10-13 |
Family
ID=4939558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92102279 Pending CN1077278A (en) | 1992-04-09 | 1992-04-09 | Indirect detector for bridge wire ignition resistance of electric detonator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1077278A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565620A (en) * | 2012-02-17 | 2012-07-11 | 北京航天自动控制研究所 | Low-voltage test circuit and method for initiating explosive device |
| CN114963902A (en) * | 2022-05-05 | 2022-08-30 | 上海芯飏科技有限公司 | Detection circuit, method and device for ignition resistance of electronic detonator |
-
1992
- 1992-04-09 CN CN 92102279 patent/CN1077278A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565620A (en) * | 2012-02-17 | 2012-07-11 | 北京航天自动控制研究所 | Low-voltage test circuit and method for initiating explosive device |
| CN102565620B (en) * | 2012-02-17 | 2014-05-28 | 北京航天自动控制研究所 | Low-voltage test circuit and method for initiating explosive device |
| CN114963902A (en) * | 2022-05-05 | 2022-08-30 | 上海芯飏科技有限公司 | Detection circuit, method and device for ignition resistance of electronic detonator |
| CN114963902B (en) * | 2022-05-05 | 2024-02-23 | 上海芯飏科技有限公司 | Detection circuit, method and device for ignition resistance of electronic detonator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |