SU1247502A1 - Bit for percussion drilling - Google Patents

Description

The invention relates to mining, and more specifically to a rock cutting tool during percussion drilling.

The purpose of the invention is to reduce the intensity of wear of the cable and increase the reliability of its attachment.

FIG. 1 shows the proposed chisel, general view; in fig. 2 is a view A of FIG. 1 (without lock); in fig. 3 - bottom rod with a lock, in a perspective view.

A drill bit for percussion drilling includes a housing 1 with a one-sided knife bevel at the lower end and a shock absorber 2 suspended on the cable 3 of the drilling machine winch by means of a rod 4. connected to the rape socket 5 by a hinge 6. In the upper part of the housing 1 there are a number of holes 7, 8 and 9, the diameter of which is a (Fig. 2), as well as a groove 10, made in a plane perpendicular to the axis of said holes. In the walls of the groove 10 is made through the slots 11 with a width equal to. At the lower end of the rod 4 is rigidly fixed latch 12 with the flats 13, and the diameter value from the latch 12 is equal to the diameter and holes 7, 8 and 9, and the thickness d of the clamp on the flats 13 is equal to the width in the slots 11.

Impact bit works as follows.

When drilling large-diameter wells with solid interlayers or boulder inclusions, the bit suspension is connected by connecting the rod 4 to the winch cable 3 using a rax socket 5 with a hinge 6, and then the rod 4 is installed at a right angle to the axis of the body 1 and the clamp 12 is inserted into the slits 11 until the longitudinal axis of the clamp coincides with the center of the hole 7, then the rod is rotated 90 °. In this position (Fig. 1), the chisel is lowered onto the face, its center of gravity is located on

In id

7

Editor M. Tovtin Order 4094/30

FIG. 3

Compiled by Y. Palashchenko

Tehred I. VeresKorrektor L

Circulation 548 Subscription

VNIIPI USSR State Committee

for inventions and discoveries

P3035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Design,

one straight line with the point of suspension of the bit (in this case with the center of the hole 7), and the knife bevel of the bit will be on the periphery of the bit bottom and, when dropped on the rope 3, process the periphery of the bit.

The length of the rod 4 is chosen greater than the diameter of the well, so detaching the rod from the bit body in the well is impossible, since it is impossible to install the rod at a right angle to the body and remove the retainer 12 from the slots 11.

To defeat the center of the blade, the rod is removed from the well. It is installed at a right angle to the body and the latch 12 is installed in the hole 9 with subsequent rotation of the rod to the suspension position. In this case, the center of gravity of the bit is installed on the vertical straight line passing through the suspension point, i.e. the center of the hole 9, and the knife bevel of the bit is in the center of the bottom.

For processing the intermediate sections between the center and the periphery, the bottom hole is suspended in the hole 8.

A shock absorber 2 (usually a worn tire) protects the walls of the borehole (or pile shell) from damage by the impact of the upper end of the bit after it is dropped on the bottom and followed by the release of tension on the cable.

The advantage of the proposed bit suspension assembly is the absence of cable wear at the connection point to the bit and the elimination of the cable detachment from the bit in the well.

The proposed unit for connecting the cable to the bit can also be used, for example, when lowering various devices and devices on the cable into the well. The design also provides a transmission of a small amount of torque.

Claims (1)

DRILLING DRILLING CHISEL, comprising a body with a single-sided bevel, a groove and holes for a cable clamp, characterized in that, in order to reduce the wear rate of the cable and increase the reliability of its fastening, the bit is equipped with a rod, one end of which is connected to the cable and the other - rigidly with a retainer, while longitudinal grooves are made in the groove walls with a width less than the diameter of the housing holes, and the retainer has flats whose thickness is equal to the width of the longitudinal grooves of the groove walls. FIG. 7