SU991043A1 - Apparatus for rotary-percussive drilling of blast-holes - Google Patents

Description

(54) DEVICE FOR SHOCKING AND ROTATING DRILLING SIDES

The invention relates to devices for percussion-rotary drilling of boreholes with single-shaft-long formation of longitudinal grooves on its wall and hfoxceT to be used in explosive excavation of mine workings.

A device is known to have a drill rod and a drill bit connected to it by means of an intermediate elongated element, where the intermediate element carries a rock-breaking tool abutting against the shoulder to form a longitudinal groove on the hole wall.

However, during the drilling process, the rock cutting tool is jammed to form a groove, especially during the drilling process, which leads to its breakage. This is the reason for the low operational reliability of the device.

The closest technical solution to the invention is a device for percussion-rotary drilling of spikes containing a drill bit connected to a drill rod having a purge channel and a supporting annular protrusion at a distance from the end of the shank of the crown, and a holder that is longitudinally oriented rock-breaking elements with the possibility of rotation on the rod between the crown and the protrusion and interacting with it when drilling a hole. .

However, when using a device with an obrazukytsa when drilling a bore-hole, fine rock falls between the outer

10 surface of the rod and the inner surface of the cage, leading to their abrasive wear, which causes damage to the device.

The purpose of the invention is to improve the operational reliability of the device by reducing wear.

This goal is achieved by the fact that, in a shock-rotation device

20 drilling holes with simultaneous formation of longitudinal grooves on its wall containing a drilling crown connected to a drilling rod having a purge channel and a supporting ring protrusion at a distance from the end of the crown shank, and bearing a longitudinally oriented rock-breaking elements of the cage; turning on

30 bar between the crown and the protrusion and

interacting with it while drilling the hole, the rod on the outer surface at the location of the holder has a helical groove in communication with the blowdown channel.

FIG. 1 shows the proposed device; in fig. 2 shows section A-A in FIG. 1, in FIG. 3 shows a section BB in FIG. i; in fig. 4 shows an embodiment of the device.

The device has a drill rod

1 and a drill bit 2, interconnected by an intermediate elongated element 3, equipped with a conical socket 4 at the end of the rod 1 and a conical shank 5 under the socket of the shank of the crown 2. In the rod 1 and the intermediate element 3 there is an axial purge channel 6. At the same time, on element 3 on some distance from the end of the shank

2, an annular protrusion 7 is provided. Between this protrusion 7 and the end of the shank of the crown 2, the sleeve 3 is fitted outside the element 3, carrying longitudinally oriented rock-breaking elements 9, which serve to form longitudinal grooves on the hole wall during its drilling (Fig. 2). The clip 8 is mounted. On the element 3 with the possibility of rotation

and interacting with the support protrusion 7. In addition, the holder 8 in its front part is provided with guide longitudinal ribs 10 (Fig. 3) for fixing it in the hole.

To prevent abrasive. the wear of the cage 8 and the intermediate element 3, on its outer surface is formed by a screw groove 11 (Fig. 1), communicated by the channel 12 with the purge channel 6 of the rod 1, due to the presence of which, entering the gap between the casing 8 and the intermediate element 3, compressed air prep There is no access to particles of pedigree stuff.

In the embodiment of the device Gfig. 4) the intermediate element 3 is missing and the yoke 8 is worn outside. rod 13 to the melody by its supporting protrusion 14 and the end face of the shank of the crown 2. In the case of a screw-hole groove 11, it is performed on the surface of the rod 13 and through channel 15 communicates with its blowing channel 16.

The device works as follows.

When a perforator or other drilling machine connected to rod 1 or 13 is turned on, transfer of shock pulses and rotation to the drill bit 2 occurs, resulting in the drilling process of the hole. The clamp 8 through the support ledge 7 or 14 receives from the rod 1 or 13

o shock impulses and with its rock-breaking elements 9 causes longitudinal grooves on the wall of the drilled hole. The cuttings are removed from the hole through the gap between its wall.

5 and device. Small rock particles that appear in the gap between the sleeve 8 and the intermediate element 3 or the rod 13, fall into the helical groove 12, from which they blow out

Q compressed air.

Due to the described embodiment of the device, its abrasive wear at the location of the cage is eliminated and its service life increases.

5 reliability.

Claims (2)

The invention The device dp shock-rotary drilling of holes, containing a drill bit connected to a drill rod having a purge channel and a supporting annular ledge at some distance from the end of the crown shank, and longitudinally oriented rock-breaking elements of the holder, installed with the possibility of turning on rod between the crown and the protrusion, different 0 ham, in order to increase its operational reliability by reducing wear, the rod on the outer surface at the location of the holder has a helical groove connected to the purge channel. Sources of information taken into account in the examination 0 1. USSR author's certificate 192728, cl. E 21 C 15/02, 1966. 2. USSR author's certificate tto application number 3237261 / 22-03, cl. E 21 C 15/02, 1981 (prototype).