SU395251A1 - FM Cl. at 25d 5/17 UDC 621.542 (088.8) - Google Patents

Description

one

The invention relates to pneumatic percussion mechanisms and can be used in manual impact percussion machines for applying various strokes, cropping, chopping and riveting.

Pneumatic-type percussion mechanisms are known for delivering single blows to small-sized manual impact machines, comprising a cylinder with a differential piston-hammer and axially spring-loaded working tip, which does not perform the function of a valve.

In manual percussion machines with known pneumatic percussion mechanisms M | And the air is usually switched by means of spools or clalans. For an unstressed return piston, braking devices are provided in the design.

However, the known percussion mechanisms are complex in structure; there is no possibility for an unaccented return of the piston of the impactor to the initial position.

The purpose of the invention is to simplify the design and create an opportunity for the shock-free return of the piston shock to its original position.

This is achieved by the fact that the piston-hammer is provided with a calibrated hole connecting the supra- and sub-piston space, and

. 2

The head of the working tip is made in the form of a valve, which overlaps the connection of the podporshne space with the atmosphere; as a result, the working tool performs the functions of a valve.

FIG. Figure 1 shows a longitudinal section of the instrument, the piston in the original cavity; in fig. 2 - the same, the piston at the moment of hitting the tool.

The proposed pneumatic mechanism consists of a cylinder / in which a differential piston-hammer 2 with a calibrated orifice 3 is placed. The upper part of the cylinder is closed 4 with a fitting Y

for the supply of compressed air. The lower part of the cylinder is closed by an adapter sleeve 6 with a seat for the spring 7 and an opening for passage of the striker piston 2. A nut 8 is fixed in the adapter sleeve 6, in the central hole of which is placed the tip 9, the head 10 of which is designed as a valve. The conical undercut of the nut 8 serves as valve seats and is provided with openings 11 connecting the cylinder cavity (piston space) with the atmosphere.

Pneumatic mechanism works as follows.

The compressed air entering through the nozzle 5 fills the piston through the opening 3

cylinder space 1. Piston-drummer 2

held in the upper position due to the difference of the force of air pressure on the ends of the diffbrential piston.

In order to actuate the tool, it is necessary to press the cylinder /, by drowning the end, to 9. At the same time, the head-clalan 10 end of end 9 opens the holes //, and pressure is released under the piston. The piston 2 under the action of air and the force of the tin strikes a blow on the head: Vke 10, but “the jug.

When the load 9 is removed from the end of its 9 gavanklaian 10 under the action of the spring 7 sits on the seat of the nut 8, overlap the hole 11. When this: M through the hole 3, compressed air fills the piston space. Due to the difference in the frontal areas of the diffresadial excess pressure force under the piston returns it to its original position. In this case, the air flow through

hole 3 pritorma} nods the piston at the end of the stroke, which ensures its unstressed return.

Subject matter and iii

A pneumatic impact mechanism for delivering single blows to a small-sized manual impact machine 1M, comprising a cylinder with a differential piston-impactor and an axially spring-loaded working tip, characterized in that, in order to simplify the design and shock-free return of the piston-impactor to its original position, the piston the impactor is equipped with a calibrated orifice, connecting the over- and sub-piston spaces, and the head of the working tip; the valve is made in the form of a valve that overlaps the connection of the sub-piston a space of the atmosphere.

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