SU1752945A1 - Device for connecting drilling bit crown to pneumatic striker - Google Patents

Abstract

The invention relates to the mining industry. The purpose of the invention is to increase the reliability of the device. The device contains a bush 1, inside the ko. An adapter 10 is secured with a central through hole 13 for securing the shank 8 of the drilling tool 11. There are blind holes 12 in the mutually adjacent ends of the axle box 1 and the adapter 10, in which

Description

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pins 5 are installed for re- | rotation from the box 1 to the chaos of the tool 11. In the central through hole 13 there is an annular groove 15 connected by channels 16 with blind holes in the adapter 10. During operation, the drummer 3 strikes the shank 8 of the tool 11, Compressed air through the groove 15, the channels 16 and the holes 12 enters the well and prevents sludge from entering these holes. This helps to improve well cleaning, prevents sludge from getting inside the device and increases the reliability of the device. 3 il.

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The invention relates to mining equipment, namely, hammers for drilling wells in rocks of different strengths.

A device is known for connecting a drill bit to a pneumatic hammer, including a bush, inside which the lock and driving bodies are fixed and the shank of the drill bit with longitudinal and open grooves, which engage with the rolling bodies, is mounted. On the barrel side surface of the axle box and the head part of the drill bit there are longitudinal channels in which pins are installed (T |%

The disadvantages of this design are the short lifespan due to the rapid deterioration of the channels under the pins, the pins themselves and their loss, the clogging of the longitudinal channels with the cuttings, which leads to a decrease in the impact power of the impact hammer due to the suspension on the pins.

. It is known device 2, similar to the construction of конструкцииQ, but in which the pins are installed in blind holes in the bush and in the adapter under the drilling tool, each pin has a through hole that connects the holes in the bush and adapter with the air line.

The disadvantages of this design are the complexity and low technology due to the need to drill holes of small diameter.

Purpose of the invention increase reliability.

The goal is achieved by the fact that in a joint containing an axle box, inside of which is fixed with the help of rolling elements, the adapter shank under the drilling tool, and

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The end faces of the axle box and adapter are made with blind holes in which the pins are placed, the adapter has a central through hole that passes through the tapered expansion into the threaded surface to secure the drilling tool and is connected by channels in the largest section to the bottom of the blind holes for the pins.

FIG. 1 shows the proposed device in drilling mode, side view with a longitudinal section; on league. 2 - node I in figure 1; 3, the same node in blocking mode.

The device of the proposed design consists of axle box 1 of pneumatic hammer 2 with drummer 3, having sockets k with pins 5 and a central hole 6 within which a key 8 fixes a shank 8 with a groove 9 of adapter 10 for a drilling tool 11 with the ability to move in the longitudinal direction for a length lock stroke (1). The adapter 10 has blind holes 12, in which the pins 5, hole 13, which are connected with the exhaust hole 1 of the hammer 3, the annular groove 15, which bore holes 1b out of the holes 12, and threaded surface 17 for securing the drilling tool 11.

The assembly of the proposed device is carried out as follows.

Pins 5 are installed in the sockets k, the adapter 10 is inserted into the hole 6 with the drilling tool 11 screwed onto the threaded surface 17. The holes 12 are aligned with the pins 5, and the groove 9 is aligned with the key 7, which is pulled out at the time of passage of the shank 8 and insert- 1 after it passes. The device is ready for operation.

The proposed device works as follows.

Compressed air is supplied to the pneumatic hammer 2 and a torque is transmitted to it, the whole assembly is fed to the bottom. When the adapter 10 with the drilling tool 11 abuts the soil, the shank 8 moves the hammer 3 inside the hammer hammer 2, outputting the last of the blocking mode to the drilling mode. The drummer 3 strikes the shank 8, and the axle box 1 transmits the torque to the adapter 10 with the drilling tool 11 through the key 7 and the pins 5. At the same time, compressed air from the air hammer 2 is ejected through the hole 13. and a small volume due to the presence of a cone at the outlet of the holes 13 and the chamber in front of the end of the drilling tool 11 is separated from the main flow upon reaching the end of the drilling tool 11 and through the groove 15 and the aperture 16 enters into the opening 12, and from them through the gaps corner pins

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5 into the well, preventing penetration of drill cuttings into these gaps. In the blocking mode (Fig. 3), the air flow through the hole 13 increases, the air flow entering the holes 12 also increases, thus preventing their clogging with drilling cuttings.

Claims (1)

Invention Formula A device for connecting a drill bit with an air hammer, containing an axle box, inside which is placed an adapter with a central through-hole for fastening the shank of the boring tool, and deaf holes are made at mutually adjacent ends of the axle box and adapter, in order to transfer rotation from the axle box to the tool, different in order to increase reliability his work, in the central through hole is made a ring groove, which is connected by channels with blind holes in the adapter. Fig2 I I one one ъ ®ig, 3