SU1204713A1 - Percussive pneumatic machine - Google Patents

Description

The invention relates to mining, namely to impact machines used to destroy strong media.

The aim of the invention is to increase work efficiency by reducing the consumption of compressed air.

Figure 1 shows the schematic diagram of the machine at the start of the operating stroke; in FIG. 2, the same at the moment of the start of idling.

The pneumatic percussion machine (Figures 1 and 2) contains a housing 1 and a tumbler 2, the inner diameter of which is smaller than that of the hull 1. working tool 6. Elastically flexible hose shells 7 and 8 have diameters corresponding to the diameters of the body 1 and cup 2, and hermetically connect the tail and the head of the drummer 5 with the inner surface of the body 1 and cup 2 with the ability to block The aperture 3 forms a chamber 9, which is filled with gas under pressure lower than the supply pressure of the machine. In the rear part of the housing 1 there is a partition 10 with openings 11. The partition with openings forms with the tail sleeve 7 a closed chamber 12 into which the pusher 13 of the valve 14 goes. 5, its movement is limited by a shock absorber 15 located in the chamber 16 of the handle 17.

The percussion machine works as follows.

The gas in the chamber 9 under pressure acts on the elastic-flexible shells 7 and 8. Since the working area of the shell 7 is larger than the area of the shell 8j, a constant force appears that is directed in the direction opposite to the working tool. Under the action of this force, the drummer 5, the pusher 13 and the valve 14 initially occupy 04713

The situation shown in FIG. During start-up, the compressed air through the channel in the handle enters the chamber 16, and then through channel 11 into the closed

S chamber 12, Under the action of compressed air, the impactor begins to make a working stroke. At the same time, the pusher 13 and the valve 14 also begin to move towards the working tool 6. When the valve 14 reaches the partition 10 and overlaps the channels 11, the impactor continues to move and causes

15 blow to the working tool 6. In the same moment, the exhaust of compressed air from the closed chamber 12 through the exhaust holes 3 (figure 2). Further, under the action of a constant force in the chamber 9, the striker makes a working stroke, at the end of which the valve 14 opens through the pusher 13, after which the cycle is repeated.

25 Due to the fact that the chamber 12 is closed intermittently overlaps with the valve 14, the consumption of compressed air is saved. In addition, idling occurs with a lower resistance than with a constant supply of compressed air into the chamber 1 2. As a result, the working stroke of the striker increases, and, consequently, the efficiency of the tire is increased. However, an increase in the stroke of the impactor can lead to a decrease in its pre-impact speed. To prevent this from happening, it is necessary that the distance E between the end of the pusher and the partition wall at the moment of impact is determined by the ratio

 1 ъ (,

45 where L is the distance from the partition.

to exhaust port:, gas pressure in the chamber; Pg - gas pressure in the network: n - polytropic indicator.

50

The application of the invention allows

, increase machine efficiency by reducing the consumption of compressed air,

55

4 .1

F {lg.CH

Editor T. Parfenova

Compiled by J. Strela

Tehred I.Astalosh Corrector V.Sinitska

8499/29 Circulation 481 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch ShSh Patent, Uzhgorod, Proektna St., 4

Claims (1)

USSR copyright certificate No. 1141823, class E 21 S 3/24, 1982. (54) (57) PNEUMATIC SHOCK ACTION MACHINE, including a housing with exhaust openings, in which an axially movable drummer a working tool and two different diameter elastic sleeve shells are placed, by means of which the tail and head parts of the projectile are hermetically connected to the inner surface of the body with the formation of a chamber filled with gas under a pressure lower than the network pressure *, characterized in that, in order to increase work efficiency by reducing consumption and compressed air, it is provided with baffle with holes, which is arranged in the housing and forms with the tubular shell tail part impactor closed chamber, and a valve tappet for interaction with the hammer which is installed in the partition to overlap its openings, the length _with the pusher is greater than the thickness of the bridging - SS of the rod by 2-, determined from the dependence where L is the distance from the partition to the exhaust hole; - gas pressure in the chamber; P _with - gas pressure in the network; η is an indicator of polytropy.