SU848340A1 - Hand-operated pneumatic hammer - Google Patents

Description

one

The invention relates to mining and construction, hand-held pneumatic hammers, and can be used in the design of heavy mounted hammers.

Pneumatic hammers are known, including a cylinder, a differential piston-drummer with an annular groove and a channel having access to the side surface, an idling chamber on the tool side, a flowing network pressure chamber, an annular stroke KciMepy to the pneumatic buffer chamber on the drummer side with a smaller diameter.

The disadvantage of this hammer is the presence of a pneumatic buffer, which creates a high counterbalance and prevents the striker from moving rapidly to the calculated position by the end of idling, which is associated with an increase in air flow from the network.

The closest to the invention in technical essence and the achieved effect is a hand-held pneumatic hammer, comprising a cylinder with air distribution channels and an annular chamber of pressure, a differential hammer dispersed in it with a central channel having an outlet on the lateral surface separating the cylinder cavity on the face and an annular intermediate chamber of the working stroke, connected by a bypass channel and an idling chamber 2.

A disadvantage of the known device is low specific power.

10 blows

The purpose of the invention is to increase the impact power.

This goal is achieved by the fact that the bypass of the cylinder is connected to the annular chamber of the network pressure by means of a throttle channel of pressurization.

in fig. 1 shows a pneumatic hammer with a stepped 20 version; in fig. 2 - the same, with stepless execution.

A hand-held pneumatic hammer contains a cylinder 1 with an air distribution channel 2, a drummer 3 with a pro25 point in its middle part and an inlet channel 4 having access to a side surface. The exhaust channel 5 in the cylinder periodically reports the idle chamber 6 and the annular chamber

30 py 7 working stroke.

The end chamber 8 of the working stroke is communicated by the overflow channel 9 with the annular chamber 7 at work. his move.

The annular chamber 10 of the net air pressure periodically, depending on the position of the striker 3, by means of its annular groove, communicates with the annular chamber 7 of the working stroke and the constant throttle channel 11 of the boost with the bypass channel 9.

Work tool 12 is located on the camera side b idling. Manual pneumatic hammer; works as follows.

Compressed air from the network through a handle starter (not shown, can be of any type) and channel 2 enters the annular flow chamber 10 in cylinder 1, from where it is channeled through channel 4 in drummer 3 and into chamber 6 of idling. Under the action of a pressure impulse from the chamber b, the drummer, 3, begins to move away from tool 12, idling.

After the outlet channel 5 is closed in chamber 7 and channel 9 connected to it by chamber 8, the air cut off in them begins to compress, and when the annular groove of the striker 3 is combined with the chamber volume 10, the air entering them from the network through channel 9. The throttle channel 11 of pressurization Chambers 8 continuously communicate the chamber 10 with the channel 9 and, therefore, with the chamber 8, due to which the air pressure in the latter is always greater than without pressurization.

At some moment of movement of the striker 3, its channel 4 overlaps with the cut-off edge of chamber 10, after which the striker opens channel 5 from the side of chamber b, and from it comes the discharge of waste into the surrounding space. Meeting the back pressure from chambers 7 and 8, the drummer 3 slows down and stops. Under the action of pressure from the chambers 7 and 8, the striker begins to move to the tool, making a working stroke.

The air constantly flowing through the throttle channel 11 of the boost during the working stroke allows the pressure in the chambers to be maintained at a high enough level, and the high speed of the striker is maintained at a high pressure.

nof as motion moves, the annular groove of the beats arnica closes the main

the access of air from chamber 10 to chambers 7 and 8, which are filled only by channel 11 of supercharging, maintaining in them a sufficiently high average pressure. After the drummer closes channel 5 in chamber 6, the air cut off in it begins to compress, and from the moment channel 4 is opened in chamber 10, air leaks from the network.

At the next moment of movement, the drummer opens channel 5 from the side of chamber 7, from which, and hence from chamber 8, exhaust air is discharged through channel 9 into the surrounding space. The release from chamber 8 is somewhat delayed, which creates an additional impulse of the working stroke, which is used to balance the back pressure pulse from

cameras 6.

Having overcome the back pressure from the chamber 6 side, the drummer 3 strikes the instrument and the process repeats, with the only difference being that

the salting impulse is complemented by the rebound impulse of the striker from the tool.

The invention allows to significantly increase the energy of a single blow and the impact power.

Claims (2)

1. Authors certificate of the USSR 128408, cl. B 25 D 9/04, 1955. 2. USSR author's certificate 5 No. 1391914, cl. B 25 D 9/04, 1970 (prototype).