RU2386004C1 - Fastener assembly of drilling device - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: in structure of fastener assembly of drilling device, containing casing, fixed in casing bearing box and semi-rings, according to the invention semi-rings are fixed by fixer on bearing box with ability of radial motion and they are constricted by flexible ring, and at internal side of casing it is implemented annular rebore.

EFFECT: fast and easy changing of crown bit at any wear, and ability of manufacturing of it without full disassembly of fastener assembly of drilling device.

2 cl, 1 dwg

Description

The invention relates to the mining industry, and in particular to a drilling tool designed to work with submersible hammers, and can be used for sinking wells in rocks.

A drilling device for impact-rotation action [1] is known, including an anvil (body) fixed in the anvil by means of a drive sleeve (axle box), a drill bit and half rings placed in a groove of the tail of the drill bit.

The disadvantages of this drilling device is the complex and time-consuming process of removing and installing the drill bit in the housing when it is replaced due to the need for a complete disassembly of the attachment point of the drilling device.

The technical task of the invention is to eliminate this drawback by using a technical solution in the design of the mounting unit of the drilling device, which allows replacement of the drill bit without complete disassembly.

The task is achieved in that in the design of the attachment point of the drilling device containing the housing, the axle box and half rings fixed in the housing, according to the invention, the half rings are secured by a latch on the axle box with the possibility of radial movement and are pulled together by an elastic ring, and an annular bore is made on the inside of the housing.

The specified set of features allows you to simplify the replacement of the drill bit and make it without completely disassembling the attachment point of the drilling device.

The essence of the technical solution is illustrated by an example of a specific design and a drawing, which shows a longitudinal section of the attachment site of the drilling device.

The mounting unit of the drilling device consists of a housing 1, on the inside of which an annular bore 2, an end face 10 and an annular bore 12 are made. In the housing 1, an axle box 3 is fixed by means of a thread, two half rings 5 are fixed on the upper edge of an axle box 3 with the possibility of radial movements pulled together by an elastic ring 13 installed in a bore 14, located on the outer side of the half rings 5. The drill bit 6 with its shank 7 with a groove 8, a chamfer 9 and a thickening 11 in the upper part is installed in the mounting from versts of the axle box 3.

The mounting unit of the drilling device operates as follows.

Before installing the drill bit 6 in the axle box 3, the axle box 3 is partially removed from the housing 1 in such a way that the half rings 5 fixed on the axle box 3 with a retainer 4 are installed opposite the annular bore 2 of the housing 1. Then, the drill bit 6 is inserted with the shank 7 into the mounting hole of the axle box 3 until until the chamfer 9 of the shank 7 rests against the half rings 5 and spreads them apart. In this case, the half rings 5 enter the annular bore 2 and, having missed the thickening 11, return to their original state by tightening them with an elastic ring 13 installed in the bore 14, leaving the annular bore 2 and inserting the shank 7 into the groove 8, which does not allow the drill bit 6 fall out of the axle box 3. Next, the axle box 3 is inserted through the thread into the housing 1 until it stops, while the half rings 5 enter the annular bore 12 of the housing 1 and abut against the end face 10 of the housing 1, which prevents them from moving in the radial and axial directions. Half rings 5, holding the drill bit 6, while allowing it to move in the axial direction, which provides a more efficient transmission of shock pulses. Torque is transmitted to the crown with simultaneous striking of the shank 7 of the drill bit 6. The impact energy through the drill bit 6 is transmitted to the bottom of the well, ensuring the destruction of the rock. When replacing the spent drill bit 6, the axle box 3 is partially withdrawn from the housing 1 so that the half rings 5 exit the annular chamfer 12 and are installed opposite the annular bore 2 of the housing 1. Next, the drill bit 6 with the shank 7 is withdrawn from the mounting hole of the axle box 3 until the thickening 11 of the shank 7 does not rest against the half rings 5 and does not separate them to the sides. In this case, the half rings 5 enter the annular bore 2 and, having passed the chamfer 9, by tightening them with the elastic ring 13 installed in the bore 14, they return to their original state, leaving the annular bore 2. The spent drill crown is removed.

The use of the proposed improvements in the design of the attachment point of the drilling device provides a quick and easy change of the drill bit for any wear and tear and allows it to be performed without completely disassembling the attachment point of the drilling device.

The source of information

1. Patent, Russian Federation No. 2125147, 1996, according to class E21B 7/20.

Claims (2)

1. The mounting unit of the drilling device containing a housing fixed in the housing of the axle box and half rings, characterized in that the half rings are mounted on the axle box with the possibility of radial movement, and an annular bore is made on the inner side of the housing. 2. The mounting unit of the drilling device according to claim 1, characterized in that the half rings are pulled together by an elastic ring.