SU726324A2 - Crown bit for percussion drilling - Google Patents

Description

one

I The invention relates to mining equipment, in particular to a drilling tool of a rotary percussion effect, designed to equip pneumatic hammers in the extraction of minerals by the open and underground methods of rocks of medium and high strength.

The known percussion crown, having a through central channel and lateral channels communicating with it, extending into the depressions between the crown feathers and intended to supply fluid to the base. drill hole 1J.

According to the main author. St. W 325370 known crown for percussion drilling, having a through central channel, dispersed at an angle k of its axis and communicating with it side channels extending into the hollows between the crown feathers and intended for supplying the fluid to the bottom hole of the borehole ball bayonet connection with pneumatic impact.

When drilling rocks, it is necessary to remove and install the crown in the hammer for the purpose of

sharpening or other factors. The crown has an axial movement relative to the hammer, due to the impact of the impact piston. The exhaust air of the blow hammer is blunt through the central channel of the crown to the bottom of the borehole in portions, and the wellbore is blown from the drilling fines, which drops into the connection between the hammer and the shank of the drill crown. When the drill trivia gets into the connection, there is an intense wear of the nests under the balls in the pneumatic drummer 5 and the lateral grooves of the shank of the crown, since the drill crown has axial movement. At the same time, the balls in the sockets are installed closer to the center of the hammer, without having a drill bit in it. A crown. This creates certain difficulties in installing the crown in the hammer. Since the end face of the crown undergoes a shock load transmitted by the piston to a non-striker, a metal hinge occurs in it, with which it fills the side grooves on the crown shank extending into its end. This also creates difficulty in fitting a crown in an air hammer.

In the process of the pneumatic hammer operation, the exhaust air is almost completely supplied through the central X-core of the crown to the scaling vent. On purge ball bayonet | compounds from drilling fines have a small amount of treated air, because the end of the corky is made perpendicular to its axis,

The aim of the invention is to improve the installation of the drill bit in the hammer when the nests under the balls are worn, to eliminate the inclination of the side grooves in the area of their exit to the butt of the crown to improve the condition of purging the joint from the drill trifle. elimination of wear of the side grooves dp ball bayonet connection on the crown shank.

This goal is achieved by the fact that on the end surface of the shank of the drill bit in the exit zone of the side grooves for the ball bayonet connection, the end inclined holes are made. These holes are made curvilinear, and their number corresponds to the number of Sokovy grooves, the output nx in the end face of the shank of the crown dp of the ball bayonet connection,

Fig, 1 shows a general view of the crown; FIG. 2 is a view A of FIG. 1; FIG. 3 is a section BB of FIG. 2; Fig. 4 is a sectional view B-B of Fig. 3, Fig. 5, is the head of an air hammer.

The crown consists of a body 1f through the central channel 2 of the radial 3 and the side 4 grooves for the ball joint, the end inclined holes 5, the shank b, the side channels 7, the crown Reinforced with carbide pins 8 and plates 9, on the front part of the shank there is a groove 10 The rock crown 11 is installed in the hammer 12, due to the ball joint 13, it is held in the hammer and rotates with it.

To improve the installation of the drill crown, in the pneumatic hammer and purge the ball bayonet connection 13, face inclined holes 5 are used. During drilling, the piston-impactor performs reciprocating movements, striking the end of the drill crown, while the metal is blasted onto Nei not side channels 4, which would make it difficult to remove and install the drill bit 11, and the inclined end holes 5. After the impact piston 14 strikes the drill bit 11, it returns to the rest position, and the air exhausted in the pneumatic hammer or other and the medium is supplied as a pulse through the central channel 2, and so on inclined wells socket 5 to the side 4 and the radial grooves 3. When the exhaust air entering the lateral and radial grooves drilling koronki.proiskhodit purging ball bayonet connection. Burova trifle misses between the shank of the crown and the hammer, it eliminates the wear of the side grooves of the shank. Together with the drilling fines, the treated air or other fluid is removed from the well through the side channels 7,

Claims (1)

Invention Formula 1, a crown for percussion drills on avtsevs, no. 325370, characterized in that, in order to increase the reliability of increasing the durability of the ball joint, on the end surface of the crown shank in the exit zone of the lateral grooves for the ball joint, end inclined holes are made, 2, crown according to claim 1, characterized in that the inclined end holes are made curved, Sources and information taken into account in the examination 1, US Patent No. 3452,832, CL, 175-416, published, 1969.