SU480288A1 - Device for blasting - Google Patents

Description

(54) DEVICE FOR EXPLOSION

one

The invention relates to a device for remote blasting of radio borehole charges in quarries of the mining industry.

A device for detonation by radio of electric detonators is known, which contains a radio receiver of signals, preparatory and command circuits made on filters tuned to the frequencies of the preparatory and command signals, Schmidt triggers, the AND block, transistor switch on two transistors.

In the known electro-explosion devices, the signal to the detonator is transmitted through the wires of the battle line, which can be affected by interference from stray currents and other external electromagnetic fields.

The purpose of the invention is to create a device for electrofusing a remote beam action controlled by radio and provided with protection against external radio interference.

For this purpose, the device contains a system of filters tuned to the frequency of the preparatory and command signals, and the AND logic, with the filter input tuned to the frequency of the command radio signal being shunted by a thin conductor when the training signal arrives.

included in the collector-emitter circuit of a transistor switch, the base of which is connected to two parallel filtering units through a logic circuit, tuned to two frequencies modulating the carrier frequency of the preparation signal, and the electric detonator is connected in series with the storage capacitor to the collector-emitter circuit of the transistor switch the base of which (after passing the preparatory signal) through the Schmidt trigger, the filter of the command signal, the pulse shaper and the resistor are connected to the receiver com command signal.

The drawing schematically shows the proposed device.

The device for electroexplosion by radio contains a receiver of signals 1, filters 2 and 3 of the preparatory signal, Schmidt triggers

4-6, the logic circuit "And 7, the transistor switches 8-10, the filter 11 command signal, burnout conductor 12, the resistor 13, the electric detonator 14 and the capacitor-drive 15.

5 The device explosive radio works as follows.

A few seconds before the explosion, the receiver of signals 1 receives a preparatory signal, which is a combination of

0 two frequencies, which is modulated by the carrier frequency of this signal. These frequencies are allocated on filters 2 and 3 and, after some transformations, flow into the "AND" output circuit: with the impulse of which transistor switches 8 and 9 open. The current of the open transistor 9 burns through the conductor 12, and the input of the filter 11 is unblocked.

Coming later, the modulated frequency command signal through a resistor 13, filter I, tuned to this frequency, passes through the reforming circuit, Schmidt trigger 6 and enters the base of the transistor switch 10. In this case, the open transistor switch 10 and the electric detonator included in the collector-emitter circuit of the latter 14, the discharge current of the storage capacitor 15, which ignites the electric detonator, passes.

Claims (1)

Invention Formula Device for blasting by electric detonators containing a radio receiver signals, preparatory and command circuits, made on filters tuned to the frequencies of the preparatory and command signals, Schmidt triggers, logical block "AND, transistor switch on two transistors, characterized in that, in order to increase the reliability of blasting, the filter input, tuned pa frequency of the command signal, shorted by the boggy conductor included in the transistor circuit a key whose input is connected to the input of a logic circuit "And, to the input of which signals from filters tuned to the frequencies of the preparatory signals are supplied, and the electric detonator is connected to a storage capacitor via a transistor switch.