SU1579946A1 - Percussion action pneumatic machine - Google Patents

Abstract

This invention relates to percussion machines used in construction and mechanical engineering for cutting metal, riveting, etc. The goal is to reduce air consumption through controlled exhaust, as well as to ensure reliable start of the machine. The machine is equipped with a barrel mounted in the housing with radial inlet and exhaust openings and elastic annular partitions with through longitudinal and radial openings separating in the longitudinal direction a closed annular chamber formed by the housing and the barrel, and the radial exhaust openings in the housing and partitions are aligned with the exhaust bore holes, and the spool is located in the barrel. 2 Il.

Description

possibility of reciprocating movement of the striker 8. In C 1, a working tool 6 is located. Between C 1 and the body 11, a closed annular chamber 13 is formed, divided in the longitudinal direction by elastic annular partitions 12 with through longitudinal 14 and radial 15 holes. In spool 7, exhaust 10 and feed 9 slotted apertures are spaced apart. Radial openings 15 are aligned with exhaust openings 4, 5 in С 1 and in housing 11. Between exhaust openings 4, 5 in С 1, an internal annular groove is made, and on the spool 7, three annular grooves are made in the same area, forming piles on its surface. Between C 1 and spool 7 there is a closed space, divided into additional chambers 20, 21 by seal 16. Chambers 20 and 21 through radial holes 22 in C 1 communicates from the annular chambers oh 13. When air is supplied in chambers 20,21 and B, the spool rises and drummer 8 also rises. After exhausting from chamber A, the slide valve 7 drops abruptly and an overpressure acts on the hammer 8. It is accelerated downward and strikes the tool 6. The use of such air distribution reduces air consumption and ensures a reliable start. 2 Il.

The invention relates to percussion machines, in particular, to pneumatic hand hammers used in various industries, mainly in construction and engineering for cutting metal, stripping welds, riveting, etc.

The purpose of the invention is to reduce air flow through controlled exhaust, as well as to ensure reliable start of the machine.

Fig. 2 shows a general diagram of a pneumatic percussion machine; section; figure 2 - starting node of the machine.

The pneumatic percussion machine includes a barrel 1 with feed 2 and 3 and exhaust 4 and 5 slit-like openings installed in the barrel 1 working tool b, a spool 7 in the form of an axially movable thin-walled cylinder placed in the barrel 1 the drummer 8 is installed, and the split slit feed 9 and the exhaust 10 holes are made for coordinated interaction with equivalent holes of the barrel 1. The housing 11 forms with the barrel 1 through a pair of elastic longitudinally spaced annular partition walls to 12 there is a closed annular chamber 13, the annular partitions 12 have longitudinal openings 14 for communicating with each other sections of the chamber 13, and radial openings 15 coinciding with the exhaust openings in the barrel 1 and the housing 11 and providing exhaust air. The annular seal 16 separates the closed annular space formed by an annular groove and three grooves 17,18,19 spool 7, on

two additional chambers 20 and 21, and these chambers through the radial holes 22 of the barrel 1 communicate with the closed annular chamber 13.

Pneumatic percussion machine works as follows.

Compressed air, entering the annular chamber 13, penetrates through the openings 22 of the barrel 1 into the additional chambers 20 and 21. In the chamber 20, the air presses against the unbalanced surface on the spool 7 and moves it upwards. At the same time, the air from the chamber 13 through the feed holes 3 is supplied to the lower chamber B with a variable volume and lifts the hammer 8 upward, while exhaust air from the upper chamber with a variable volume of chamber A occurs through the exhaust holes 10 of the valve 7 and the openings 4 of the barrel 1 compatible with them as well as the exhaust ports 2 on the annular partition 12 and the housing 11, and the feed ports 2 of the barrel 1 and the port 9 of the spool 7 are blocked. When approaching the upper end of the barrel 1 of the striker 8, an airbag is formed, which has a pressure higher than the main one, and simultaneously the lower end of the hammer 8 opens the upper exhaust channel - the hole 10 of the spool 7 and the hole 4 of the barrel 1 and the hole 15 of the ring partition 12 and the body 11, Pressure in chamber B falls, and a different pressure acts on the opposite ends of spool 7 - high on top, low on top. The spool 7 lowers abruptly, shutting off the supply channel of chamber B and opening the feed channel of chamber A with simultaneous overlapping of the exhaust channel of chamber A and opening the exhaust channel of chamber B. Drummer 8 starts an accelerated downward movement before impacting with tool 6. At the same time, the exhaust channel 4 (lower) and the air coming out of it into the atmosphere form a zone of reduced pressure in chamber A, and the pressure on the top end of the spool 7 weakens, while the airbag in chamber B acts with nym force on the lower end of the spool 7, and it perebrasyvaets the upper position. Further cycles are repeated.

Claims (1)

Pneumatic percussion machine, comprising a housing with feed and exhaust openings, an axially movable spool with exhaust and feed openings, made in the form of a hollow cylinder, inside of which the impactor is mounted with the possibility of reciprocating and moving, and so that, in order to reduce air flow through controlled exhaust, as well as to ensure launch reliability, Well fitted with a barrel mounted in the housing with radial inlet and exhaust openings and elastic annular partitions with through longitudinal and radial openings dividing in the longitudinal direction a closed annular chamber formed by the body and the barrel, with the radial exhaust holes in the body and partitions aligned with the exhaust holes the barrel, and the spool is placed in the barrel, while its exhaust and feed holes are made in the form of radial cracks and are spaced apart, and between them outwardly The spool surface is formed with annular grooves, which form with an groove made on the inner surface of the barrel between the radial inlets, an annular chamber, which is divided into two additional chambers by means of the annular seal placed in the latter, and the additional chambers are connected by radial inlet holes of the barrel. with a closed annular chamber. S §