SU848634A1 - Device for electric-thermal-mechanical breaking of rock - Google Patents

Description

one

The invention relates to drilling machines for electrothermomechanical destruction of rocks using mechanical effects on the face in combination with combinational plasma-arc and high-frequency heating of the working area.

A device using a plasma jet, comprising a housing with a cutting tool, a plasma torch with a non-consumable electrode and channels of a plasma-forming gas and a cooling fluid, and a reaction chamber Cl is known.

Closest to the proposed technical essence and the achieved result is a device for electrothermomechanical destruction of rocks, comprising a housing with a cutting tool, a plasma torch, non-melting electrodes, plasma-forming gas channels and a cooling fluid, and a reactive chamber covered by the G211 focusing inductor.

Due to the presence of a focusing inductor, the plasma jet is concentrated and its temperature increases, however, further temperature increase is appropriate for effective rock destruction.

The purpose of the invention is to increase the efficiency of destruction of rocks.

This goal is achieved by the fact that the device contains an additional inductor, electrically connected with the focusing inductor, and a broadband amplifier, to the symmetric outputs of which a plasma torch and focusings are connected in series, and an additional 15

A new inductor is connected to the amplifier input.

FIG. 1 shows the general scheme of the proposed device; in fig. 2 - electric circuit of the device.

The device for electrothermomechanical destruction of rocks comprises a housing 1 with a cutting tool 2, a plasma torch 3 with a non-melting electrode 4 and channels 5 and b of plasma-forming gas and a cooling fluid, respectively, a reactive chamber 7 enclosed by a focusing inductor 8.

The plasma torch 3 and the focusing inductor 8 are connected in series to the symmetrical outputs of the W.-9 and 10 broadband amplifier 11, for example, a traveling wave, to the input 12 of which an additional inductor 13 connected electrically to the focusing inductor 8 is connected. 14.

The device for electro-thermomechanical destruction of rocks works as follows.

Channel 5 supplies plasma gas and channel 6 supplies cooling fluid. The arc ignition voltage is connected to the non-consumable electrodes 4 and 14 through a vibrator (not shown), and a plasma jet is ejected through the reaction chamber 7 to the bottom of the well. The housing 1 with the cutting tool 2 is rotated. The high frequency electromagnetic oscillations amplified by the amplifier 11 are applied to the focusing inductor 8 and are converted by it into an electromagnetic field acting on both the bottom of the well and the plasma jet in the reactive chamber 7.

Due to the high-quality heating, the plasma jet becomes high-temperature, and the simultaneous impact of the plasma jet and the electromagnetic field on the bottom hole intensifies the heating of the rock. All this increases the effectiveness of the destruction of rocks. High frequency currents flow in a closed circuit: output 10 — focusing inductor 8 — cutting tool 2, electrode 14 — plasma jet in chamber 7 — electrode 4 — housing 1 — output 9. Continuous high-frequency oscillations are supported by the fact that part of the energy of the focusing inductor 8 taken by an additional inductor 13 and fed to the input 12 of the amplifier 11, the closure of the positive feedback circuit. This ensures the automatic generation of the most efficient operating frequencies corresponding to the natural frequencies of the system consisting of the device itself and the surrounding working part of the rocks.

Plasma jet heating, combinative heating of the rock and generation of resonant frequencies provide the high efficiency of rock destruction with the proposed device.

Claims (2)

1. USSR author's certificate number 137894, cl. E 21 C 37/18, 1960. 2. Authors certificate of the USSR 152634, cl. E 21 C 37/18, 1958. 2