SU1654564A1 - Downhole pneumatic hammer - Google Patents

Abstract

This invention relates to the mining industry, in particular to submersible hammer hammers. The goal is to increase the impact energy and increase reliability due to the additional intake of energy into the chamber (K) of the forward stroke and decrease the back pressure in it. The pneumatic impact tool contains case 1, hammer 2, dividing it by K 3 forward stroke and K 4 reverse, the air-distributing mechanism in the form of the sleeve 5 and the rod tube (PC) 6 with a check valve 7, the working tool 13. On the E 4 SL O а a

Description

The outer surface of the PCh 6 and on the inner surface of the sleeve 5 are made protrusions 14 and 15, between which an annular spool 8 is mounted, spring-loaded with respect to the PCB and periodically interacting with the protrusions 14 and 15. In the case 5 there are additional holes 16 and an annular groove 23, and the ledge 14 on PC 6 - radial channels 22. Throttling channels 21 are formed between the spool PC 6;

in K 4, the drummer 2 rises to groove 23, from K 4 exhaust flows through valve 12, and from K 3 through channels 21 and 22 to channel 10 of PC 6, i.e. the back pressure in K 3 decreases. When the energy carrier is supplied in K 3, the spool 8 under pressure rises to protrusion 14 on PC 6 and the channels 16 open, additional energy carrier passes in K 3. Thus the pressure in K 3 rises, which increases the impact energy. 1 il.

The invention relates to the mining industry, in particular to submersible hammer hammers for drilling.

The purpose of the invention is to increase the impact energy and increase reliability due to the additional inlet of energy carrier to the forward stroke chamber and decrease the back pressure in it.

The drawing shows a submersible air hammer, section.

The submersible pneumatic hammer includes a housing 1, inside which a hammer 2 is installed, which divides the cavity of housing 1 into chambers of forward 3 and reverse 4 strokes. The air distribution mechanism is made in the form of a sleeve 5 and a stem tube 6 with a check valve 7. The air hammer is equipped with an annular spool 8 made in the form of a hollow ring, spring-loaded 9 with respect to the stem tube 6, which has an axial channel 10, and the hammer 2 has a central axial channel an exhaust channel 11 for placement in the last stem tube 6, and an exhaust valve tube 12 fixed in the working tool 13. The ring spool 8 is mounted on the stem tube b between the projections 14 and 15, made respectively on the outer surface of the ok-tube 6 and the inner surface of the sleeve 5. The ring spool 8 is installed with the ability to interact with the protrusions 14 and 15 and to block additional inlet holes 16 made in the sleeve 5. In the rod-tube 6 are made inlet holes 17 for supplying energy to the air ducting channels 18 formed by the outer wall of the sleeve 5 and the inner wall of the housing 1. A hole 19 is made in the body of the stem tube 6, and a hole 20 is formed in the check valve 7 to additionally supply the energy carrier to the bottom. Between the inner surface of the annular spool 8 and the outer surface of the rod tube b there are throttling channels 21, and in

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the protrusion 14 of the rod tube 6, associated with its axial channel 10, are radial channels 22. In the inner cavity of the sleeve, a bore 23 is formed.

Air hammer works as follows

in a way.

During start-up of the hammer, the hammer 2 is in the reverse chamber 4. The energy source flows through the inlet holes 17 through the channels 18 formed by the gap between the housing 1 and the sleeve 5, enters the chamber 4, and the hammer 2 begins to move.

When the drummer 2 reaches the end of the exhaust valve tube 12, the exhaust from chamber 4 and the drummer 2 moves by inertia to the groove 23 in the sleeve 5, while the chamber 3 communicates with the exhaust channel 11 in the drummer 2 through the throttling channels 21 and the channels 22 to the rod -pipe 6. After hitting the projection of the projectile 2 into the bore 23, the energy carrier enters the chamber 3, and the spool 8 under the action of pressure of the energy carrier opens the additional inlet openings 16 and closes the openings 22 and the chamber 3 becomes airtight. The drummer 2 will begin to move in the opposite direction, while the pressure in chamber 3 remains almost equal to the network pressure until the moment of exhaust, when the drummer 2 jumps off the rod-tube b, the shock will occur, and the cycle will repeat.

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Claims (1)

Invention Formula Submersible pneumatic hammer. comprising a housing inside which a hammer with a central axial exhaust channel is installed, dividing the housing cavity into forward and reverse chambers, an air distribution mechanism in the form of a rod tube with an axial channel and a check valve placed in the housing, air supply channels educated the outer wall of the liner and the inner wall of the housing, a working tool, characterized in that, in order to increase the impact energy and increase reliability due to the additional inlet of energy carrier into the forward running chamber and decrease the counterpressure in it, the impact hammer is equipped with an annular slide valve mounted on the rod tube between the protrusions made on the outer surface of the rod-tube and the inner surface the liner, wherein the annular spool is spring-loaded relative to the rod-tube and is installed with the possibility of interaction with each of the said protrusions and blocking the additional inlet openings made in the sleeve. moreover, throttling channels are made between the inner surface of the annular spool and the outer surface of the rod-tube, and the radial channels in the protrusion of the rod-tube associated with its axial channel.