SU114895A1 - Explosive device with advanced shutdown - Google Patents

Description

Known explosive devices with leading disconnection for igniting single or series-connected ground detonators with glowing bridges, consisting of a power supply source, a storage capacitor, a packet switch with a contact switch, and a discharge switch (resistance of a relaxator with a neon lamp to alert the device to an explosion.

However, these devices, having considerable weight and dimensions, do not ensure the safety of blasting operations, especially in mines that are dangerous for gas or dust.

The described device is free from the indicated drawbacks, this is achieved by using a dry galetny battery as a power source by electric current, as well as using a three-second packet switch for series connection of a storage capacitor to the power source, disconnecting it from the latter at the moment of switching to the "explosion, sending igniter pulse in-line and subsequent discharge of the storage capacitor to the discharge resistance and, finally, using the instrument, in the case of blasting shogo amount of electric detonators, the additional resistance to be included in series with the blasting network and limiting the amount of current that is sent to said network.

The drawing shows a schematic electrical diagram of an explosive device. It uses: dry galetny battery /, a three-section packet switch consisting of sections 2, 3 4, a storage capacitor 5, discharge resistance 6, a contact key 7, device line clamps 8 and I electric detonators 10, a relaxer consisting of the capacitor 11, the neon lamp 12 and the resistances 13 and 14.

In the first section of switch 2, a moving contact, made in the form of a blade with sparkling shields, closes two motion contacts when rotating. In the next two sections of the switch Zi4

Xs 114895

The moving contacts are made crosswise and are also equipped with - deflecting washers.

By pressing and turning the key 7 (in the position of the three-section switch 2, 3 and 4 shown in the drawing) the battery switches through the switch 2 section and the resistance 6 to the drive capacitor 5; at the same time, switch sections 3 and 4 are disconnected from the discharge circuit.

When a predetermined voltage is reached on the capacitor 5, relaxation oscillations are formed, and the lamp 12 flashes with a certain frequency, which indicates the readiness of the explosive device to send an igniter current pulse to the line. Further, when turning the switch 7 to the position of the explosion, the moving contacts in the sections of the switch 5 and connect (for three milliseconds) the capacitor 5 to the linear terminals 5 and P and then break the output circuit again; at the same time, before sending the current pulse, a moving contact in the section of switch 2 disconnects the battery / from the capacitor 5 and closes the latter to the discharge resistance 6 after sending the igniter current pulse.

The device is mounted in a cast explosion-proof housing.

Subject invention

Claims (2)

1. An advance disconnect device for igniting single or series-connected electric detonator groups with glowing bridges, consisting of a power source, electric current, a capacitor, a packet switch with a contact switch, a discharge resistance of a relaxator with a neon lamp, which serves to indicate the readiness of an explosive device To the reference of the igniter current pulse to the line, characterized in that a dry dry battery is used as the power source in the device, and the packet switch is made three-section for connecting the storage capacitor to the power source in series, disconnecting it from the latter at the moment of switching to the "explosion" position, sending the igniter pulse to the line and subsequently discharging the co-capacitor-packer to the discharge resistance. 2. Application in an explosive device according to claim 1, of additional resistance, connected in series with the explosive network by blasting small amounts of electric detonators.