JPS62800A - Electric blasting apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric blaster that stores energy in a capacitor from a power source such as a low voltage battery.

It can be effectively used not only for blasting conventional electric detonators, but also for special electric detonators whose blast output voltage is highly regulated.

[Summary of the Disclosure] The present invention provides an electric blaster having a power source using a low voltage battery and a blasting capacitor that stores energy from the power source. a DC voltage converting means for converting the high voltage into a voltage, a voltage dividing means for dividing the high voltage, a means for extracting a voltage difference between the divided voltage output and a reference voltage, and controlling the DC voltage converting means according to the voltage difference, The present invention discloses a technique that allows output to be varied with high precision by including means for maintaining a high voltage at a predetermined value.

Note that this summary is provided solely for the purpose of quickly accessing the technical content of the present invention, and does not have any influence on the technical scope of the present invention or the interpretation of rights.

[Prior Art] Conventionally, a constant output high voltage electric blaster as disclosed in Japanese Patent No. 402,813 has been known as a capacitor set electric blaster using a low voltage battery as a power source.

In this case, the voltage of the low-voltage battery is boosted by a DC/DC converter, the resulting high voltage charges the blasting capacitor, and the discharge output detonates the electric detonator in the blasting circuit. Connect multiple neon lamps and resistors in parallel with the high voltage output, and use the discharge starting voltage and discharge current of the neon lamps to
The transistor type oscillator in the C-DC converter is controlled, thereby performing constant voltage control of the output voltage.

Conventional constant output high voltage electric blasters like this have poor constant voltage characteristics and are difficult to set because the constant output voltage is controlled by the neon lamp's discharge starting voltage and its discharge current. There was a voltage error variation of 10% or more with respect to the target voltage. Furthermore, it is necessary to select the blasting output voltage of the blaster, such as 50 rounds, 100 rounds, 200 rounds, etc., depending on the number of simultaneous firings of the electric detonator, but with conventional blasters, the output voltage is variable. Because there was no such thing, it was necessary to prepare various types of blasters and install them side by side when blasting with greatly varying numbers of shots at once.

Furthermore, JP-A-57-142498 and JP-A-58
No. 83200 discloses a delayed electric detonator that uses an electronic circuit to delay detonation, but in such a case,
The delay time cannot be set accurately unless the voltage applied to the electronic circuit is maintained with high precision.Therefore, in this case as well, it is strongly desired to set the output voltage to a predetermined voltage with high precision.

[Problems to be Solved by the Invention] Therefore, in consideration of the above points, an object of the present invention is to set the output voltage with high accuracy in a capacitor set blaster using a low-voltage battery as a power source, and to increase the blasting output. The objective is to provide an electric blaster that can vary the

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a power source using a low voltage battery and a blasting capacitor that stores energy from the power source, in which a reference voltage is supplied from the power source. a means for setting, a direct current voltage converting means for converting a low voltage of a power supply into a high voltage of direct current, a voltage dividing means for dividing the high voltage, a means for extracting a differential voltage between the divided voltage output and a reference voltage; The present invention is characterized by comprising means for controlling the DC voltage converting means in accordance with the differential voltage to maintain the high voltage at a predetermined value.

[Operation] According to the present invention, a blasting output with high voltage accuracy can be obtained. Moreover, by providing a variable resistor or the like in the reference voltage setting device or the output voltage dividing circuit, the output voltage can be freely varied.

[Example] The present invention will be described in detail below with reference to the drawings.

An embodiment of the electric blaster of the present invention is shown in FIG.

In FIG. 1, 1 is a low voltage battery, 2 is a reference voltage circuit,
3 is a deviation voltage amplification circuit using a high gain operational amplifier in the form of an IC, 4 is an output control type DC7rJC converter, and 5 is an output control type DC7rJC converter.
is an output voltage dividing circuit using a resistor voltage divider, 6 is a blasting capacitor, 7 is a discharge resistor, 8 and 9 are output terminals, 1
0 and 11 are changeover switches, 12 and 14 are movable contacts, and 13.15 and 16 are fixed contacts. The DCIDC converter 4 supplies the reference voltage from the reference voltage circuit 2 and the divided voltage from the output voltage dividing circuit 5 to the deviation voltage amplification circuit 3 and takes out the deviation voltage of one divided voltage with respect to the reference voltage. A low voltage is converted to a high voltage, and in that case, the level of the DC voltage of the high voltage output is controlled so as to reduce the deviation voltage. The resulting high output voltage is applied to the output voltage divider circuit 5 and also to the capacitor 6 via the switch 11. An electric detonator is externally connected between the output terminals 8 and 9 through a blasting bus bar, and the energy stored in the capacitor 8 is supplied thereto.

Now, when the movable contacts 12 and 14 of the changeover switches 10 and 11 are switched to the fixed contacts 13 and 15, respectively, the reference voltage set in advance by the reference voltage setting circuit 2 by the low voltage battery 1 and the output voltage dividing circuit 5 The deviation voltage from the divided voltage obtained by is amplified by the deviation voltage amplification circuit 3,
The output voltage of the output control type DC/DC converter 4 is controlled so that no deviation occurs between the re-input voltages of the deviation amplification circuit 3, and the blasting capacitor 6 is charged with a preset constant high voltage. do it like this.

Next, move the movable contact I2 of the changeover switch IO to the fixed contact 1.
3 to open the movable contact 1 of the changeover switch 11.
4 is switched from the fixed contact 15 to the fixed contact 1B, the charge charged in the blasting capacitor 6 is discharged to the blasting circuit side through the output terminals 8 and 9, detonating the detonator.

Next, specific examples of the present invention will be shown.

Example 1 A specific example in which the present invention was implemented in a blaster having a maximum blasting output voltage of 2000V and a blasting capacitor of 204F will be listed below.

Four UN-1 type dry batteries are used as the low voltage battery 1, and the reference voltage setting circuit 2 has a 3.3V Zener diode ZIl connected in series with the carbon film resistor R1, and a 3.3V Zener diode ZIl connected in parallel with the Zener diode ZD. .7 to 100Ω with 180Ω fixed resistors R2 and R3 connected in series across both ends.
It was constructed by connecting a variable resistor VRI.゛As the deviation voltage amplifier 3, an operational amplifier LM358 (two-stage DC amplifier circuit) is used, and the output control type DC/DC converter 4 includes an oscillation transistor 29B-407 and a control transistor 2SC.
-2500, ;y Consisting of an elite oscillation step-up transformer, the output voltage dividing circuit 5 is composed of a voltage dividing circuit of IONΩ and IKΩ metal film resistors R4 and R5, and a 20μF liver capacitor is used as the zero-blasting capacitor 6. , the discharge resistor 7 was composed of a wire-wound resistor. Here, the variable range of the output voltage can be freely set between 300 and 2000V, and the output voltage accuracy is 0.5% with respect to the set voltage.
The following properties were obtained.

[Effects of the Invention] In the electric blaster of the present invention, a reference voltage setting circuit and an output voltage dividing circuit to be compared with the reference voltage setting circuit are provided in a capacitor set blaster using a low voltage battery as a power source, and the deviation voltage of these two circuits is increased. The gain is amplified by a deviation amplifier, and the output of the amplifier is used to control the operation of the output control type DC/DC converter, so that almost no deviation occurs in the re-input voltage of the deviation amplifier. By controlling the output of the inverter, a highly accurate and constant high output voltage can be obtained.

Moreover, by providing a variable resistor in the reference voltage setting circuit or the output voltage dividing circuit, the output voltage can be freely varied.

According to the present invention, it is possible to practically construct an electric blaster that can be made small in size and capable of determining the set voltage with high precision, without changing the price from the conventional one. According to JP-A-57-142498, it is possible to provide an electric blaster that can vary the output with high precision, so it can be used not only for blasting conventional electric detonators, but also for the above-mentioned Japanese Patent Laid-Open No. 57-142498, which has large regulations on blasting output voltage. Japanese Patent Publication No. 1983
A stable power supply can also be provided for electrical delay detonators with built-in energy storage capacitors, such as those disclosed in US Pat.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the electric blaster of the present invention. l...Low voltage battery, 2...Reference voltage setting circuit, 3...Difference voltage amplifier, 4...Output control type DC/DC converter, 5...
Output voltage dividing circuit, 6... Blasting capacitor, 7... Discharging resistor, 8.9... Output terminal, 10.11... Changeover switch, 12.14... Movable contact, 13. 15.18...Fixed contact.

Claims (1)

[Claims] 1) An electric blaster having a power source using a low-voltage battery and a blasting capacitor that stores energy from the power source, comprising: means for setting a reference voltage from the power source; DC voltage converting means for converting into a high voltage; voltage dividing means for dividing the high voltage; means for extracting a voltage difference between the divided voltage output and the reference voltage; and the DC voltage converting means according to the voltage difference. and means for controlling the high voltage and maintaining the high voltage at a predetermined value.