SU1001714A1 - Bit for electrohydraulic drilling of blastholes - Google Patents

Abstract

THE CROWN FOR ELBKTRO-HYDRAULIC DRILLING OF SMOKER, containing the case, the tail part of which has a channel for supplying a conductive washing liquid and an electrode connected to the current generator is installed, and the head part is made with nozzle holes and rock formations and an electric discharge chamber located between the head and tail parts of the case, In order to increase the drilling efficiency by additional impact of the crown on the face, the head part of the body is mounted with the possibility of axial movement. minutes, and kansshe for podvodatokoprovod boiling wash liquid, a check valve.

Description

The invention relates to a rock cutting tool for drilling holes using an electro-hydraulic effect.

It is known an electro-hydraulic device for generating pulsed pressures in a liquid, including two coaxially mounted electrodes connected to a current pulse generator and located in a chamber filled with liquid, where one of the electrodes has a central channel for supplying conductive liquid into the space between the electrodes C1].

In this device, the conductive liquid forms an electrically conductive bridge between the electrodes, causing a discharge. The portions of the conductive fluid and the time it takes to initiate the discharge are controlled using a synchronizing electronic means, the presence of which significantly complicates the design and operation of the device.

The closest in technical essence and the achieved result is an electro-hydraulic crown for rock destruction, comprising a housing, in the rear of which there is a channel for supplying conductive flushing fluid and an electrode connected to a current generator, the head part is made with nozzle holes, and between The head and tail parts of the body are the L2J electric discharge chamber.

A disadvantage of the known crown is the low efficiency of electro-hydraulic shock to destroy the rock and, consequently, the low drilling speed. 40

The purpose of the invention is to increase drilling efficiency by additional impact of the crown on the face.

This goal is achieved by the fact that 45 in the crown for electro-hydraulic drilling of holes, comprising a housing, in the tail part of which there is a channel for supplying a conductive WASHING FLUID, and an electrode is installed jq connected to a current generator, and the head part is made with nozzle holes and rock cutting elements , and located between the head and tail parts of the body of the electric discharge chamber ⁵ , the head part of the crown body is mounted with the possibility of axial movement relative to the tail, and in the channel for supplying conductive flushing fluid 60, a check valve is installed.

VNIIIPI Order 8264/7

The drawing shows the proposed crown, a longitudinal section.

The crown consists of a housing made of two parts: the tail part 1 and mounted on it 5 movably in the axial direction of the head part 2. In the tail part 1 there is a channel 3 for supplying flushing fluid in which the check valve 4 is located. Supply voltage 10 to the spark gap 5, located in the discharge chamber 6, is carried out via a high-voltage cable 7 connected to a generator (not shown) of current pulses 15. In the head part, nozzles 8 are made for leaving the flushing fluid from the discharge chamber 6. The head and tail parts of the drill bit are connected using 2 "spline joints 9. The screws 10 in the grooves 11 limit the stroke of the head part 2 of the drill bit.

Drilling is as follows.

The conductive flushing fluid passes through the channel 3 and through the check valve 4 is supplied to the discharge chamber 6 of the drill bit, which is located directly at the bottom. The high voltage cable 7 30 voltage is supplied to the arrester 5.

In the space between the tail part 1 of the drill bit body and the spark gap 5, a discharge occurs in the flushing fluid. At the same time, a plasma piston forms 35®, which closes the check valve 4, blocking the access of the flushing fluid to the discharge chamber 6. At the same time, the head part '2 of the drill bit strikes the face, and the flushing fluid through the nozzles 8 also strikes the rock. After the pressure has been relieved, the check valve 4 allows the drilling fluid to enter the discharge chamber 6 and the process is repeated .. Consequently, mechanical and hydraulic shocks are simultaneously applied to the rock.

This design allows the crown due to the impact of two strokes to increase the drilling speed. When combined, a mechanical shock forms a destruction crater, and a system of deep cracks is destroyed exiting the nozzles; under high pressure fluid. Thus, with each impact, a fracture crater and a weakened layer are formed, and the drill bit deepens with each impact, which makes it possible to increase the drilling speed.

Circulation 564 Subscription

PPP Branch

Patent

Uzhhorod, Project 4,

Claims (1)

CENTER FOR ELECTRIC HYDRAULIC DRILLING OF SKINS, containing a housing, c. the tail of which has a channel for supplying conductive flushing fluid and an electrode is connected to the current generator, and the head is made with nozzle holes and porous * destructive elements, and an electric discharge chamber located between the head and tail parts of the housing, characterized in that, with In order to increase drilling efficiency by additional impact of the crown on the bottom, the head of the body is installed with the possibility of axial movement. Relative to the tail, and in A check valve is installed for the supply of conductive flushing fluid. (L