SU1209328A1 - Pneumatic percussive machine - Google Patents

Description

FIELD OF THE INVENTION The invention relates to mining, namely to pneumatic impact boring machines.

A non-pneumatic percussion machine with a drummer and flexible sleeve elements placed in the corns is known, in which the sleeve elements with a drummer form a closed chamber ij

The disadvantage of such a device is that not all the force acting on the drummer in the direction of the working tool is used to strike the tool.

Closest to the present invention is a pneumatic percussion machine containing a hammer located in the housing, made in the form of a fallen piston formed by a metal impact part and a flexible sleeve, a mandrel fixed in the housing, tightly connected to the inward-free end of the sleeve, the working tool and the air distribution unit 2J.

The disadvantage of such a machine is that it has a constant force acting on the flexible hose, both during the chlost and the working stroke of the firing pin, which reduces the efficiency of the machine.

The purpose of the invention is to increase the efficiency of the machine,

The goal is achieved by the fact that in a pneumatic percussion machine, including a drummer placed in the housing, in E) 1 complete in the form of a hollow piston, a flexible hose connected to the drummer and a mandrel mounted in the housing, a working tool and an air distribution unit the mandrel is made with a variable diameter, the mandrel at the junction with a flexible sleeve has a larger diameter, and the transition from a larger diameter to a smaller one is made in a curve according to the formula

tech

P

, / V, P2 .d)

one

- the diameter of the mandrel in place

flexible hose attachment; - the volume of the idling chamber at the beginning of the stroke of the impactor;

093282

V is the volume of the idle chamber at the end of the reverse stroke of the impactor; p is an indicator of polytropic.

5 Figure 1 shows the diagram of the machine at the beginning of the working time; figure 2 - the same, at the time of the beginning of the reverse.

Pneumatic shock machine

10, the action consists of the case I, in which the drummer is placed with the possibility of axial movement, made in the form of a closed hollow element formed by a metal shock part 2 and a flexible sleeve 3. In case 1 it is mounted, on the mandrel 4, a shaft is coupled to the rolled inside the free end of the sleeve 3, 3 end working

20 stroke drummer with its shock part of 2 n; 1 blows to the shank of the working tool 5. Compressed air in KajMepy 6 idle running comes from the network through channels 7 and 8. Mandrel 4

25 is fixed on the lid 9, in which the device 0 is located, which serves as a non-return valve when gas is supplied to the impactor under pressure. Case i is equipped with exhaust ports - - 1-1И 11 and 12. The mandrel 4 is made with a variable diameter, changing ush {m-s according to the law, above. The gchevmaticheskaya percussion machine works as follows. In a closed hollow element

35

40

through the device O pump compressed air (gas) up to the pressure P ,, -.,. Under the influence of this

m l

pressure on the impactor is a force acting in the direction of the worker

45

tool. The magnitude of this force is determined by pressure, and the difference between the internal areas of the metal impact part 2 and the flexible sleeve 3, the internal area of the metal impact part is determined by the internal diameter D. The internal area of the flexible sleeve 3 is determined by the difference in diameters -1etr case 1 and the outer diameter of the mandrel 4.

At the initial moment, the drummer is located as shown in FIG. Energy (compressed air) from the network through channels 7 and 8 enters the idle chamber 6 and occupies volume V ,. Under the pressure of the energy carrier acting on the area determined by the outer diameter of the metal impact part D, the impactor moves to the position shown in Fig. 2. In this case, the force acting in the direction of the working tool is reduced by the law determined by the external profile of the mandrel 4 and is minimal at the end of the return stroke. When the drummer opens the exhaust port 11 with the lower edge of its metal impact part 2, a pressure drop occurs in the idle chamber 6. The drummer under the action of the force acting in the direction of the working tool, makes a working stroke, at the end of which strikes the shank of the working tool 5. During the working stroke, the force acting in the direction of the working tool. This increases and is maximum at the moment of impact. Thereafter, the cycle repeats.

A change in the force acting in the direction of the working tool during the operation of the machine makes it possible to increase the efficiency of the machine by increasing the energy of a single blow.

and increase CDC.

Network

GO 5

and

Editor S.Lyzhova

Compiled by Yu.Strelov

Tehred L.Mikesh Proofreader S.Shekmar

Order 359/15 Circulation 470 Subscription

VNIIPI USSR State Committee

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

Branch PPP Patent, Uzhgorod, st. Project, 4

Claims (1)

PNEUMATIC SHOCK ACTION MACHINE, including a hammer placed in the body, made in the form of a hollow piston, a flexible sleeve connected to the hammer and the mandrel, which is installed in the body, a working tool and an air distribution unit, characterized in that, in order to · increase the efficiency of the machine, the mandrel is made with a variable diameter, while the mandrel at the junction with the flexible sleeve has a larger diameter, and the transition from the larger to the smaller diameter is made according to the curve where o _f is the diameter of the mandrel at the attachment point flexible sleeves; U ₍ - is the volume of the idle chamber at the beginning of the reverse stroke of the striker; - the volume of the idle chamber at the end of the return stroke of the striker; And - an indicator of politropy. >