SU1634481A1 - Pneumatic striker - Google Patents

Abstract

The invention relates to pneumatic impactors. The purpose of the invention is to stabilize the impact energy by adjusting compressed air to an accumulator. The hammer is provided with a lock for holding the piston piston 8 in the form of a spaced 2 and a hollow HMI radial partition wall 11 sec. a set of 2 facing the piston-hammer 8 and the pressing element 13 mounted on the charger of the peak 8 facing the piston 12 facing the saddle 12, with a check valve along the i-axis of the spring 17 in the axial direction of the charm 17 and connected to the piston by the chadney but by means of the pusher 16. The piston of the pit S is made with an annular flange IS forming with the inner surface of the housing 1 along them labyrinth density 1 HI

Description

 four

± /

s

and

L /

L

-3

СЪ. OS 4- ОS.

iiofipi -i isa refers to machine building, in particular, to machines of impact

pi, and can be used in ka; not a pneumatic hammer for branding, klep-11 and spruing gates.

ILc.ih invention - the stabilization of the impact energy by regulating the pressure of compressed air.

The drawing shows an air hammer to its original position for impact.

The pneumatic hammer contains a hollow body 1 with successively located accumulator 2 and working 3 cavities with dredging radial channels 4, connected f- with a working cavity 3, and with inlet | mn 5 and output b channels connecting uiiH other with accumulating cavity 2, located in the latter spring-loaded spring 7 in the axial direction of the piston-drummer 8, which divides the working cavity 3 into the chambers of the worker 9 and idle 10 strokes. The pneumatic hammer is equipped with a lock for holding the piston of the hammer 8 as placed between the accumulator 2 and the working 3 cavities of the radial partition 11 with the saddle 12 facing the piston-hammer 8 and the sealing element 13 fixed on the butt of the piston 8 facing the saddle 12 The hollow body 1 also has a guide bushing 14 for the piston rod 15 of the impactor 8, and the latter is fixed with the possibility of adjustment in the axial direction of the pusher 16. The pneumatic impactor is also equipped with a check valve in the form of a shaft that is spring-loaded in the axial direction ika 17 placed in the inlet channel 5 and connected to the piston-pusher hammer 8 through 16. The piston-firing pin 8 is made with an annular flange 18 forming the inner surface of the hollow body 1 a labyrinth seal. The input channel 5 is connected to the compressed air line through an adjustable choke 19.

Hammer works as follows.

In the initial position shown in the drawing, the compressed air from the compressed air line through the adjustable throttle 19 and the open non-return valve in the form of a spring-loaded ball 17 enters the accumulating cavity 2 and fills it until the pressure acting from the accumulating cavity 2 on piston-hammer 8, will not exceed the installation force of the spring 7. When the acting forces reach an equilibrium, the seal 12 is decompressed with the sealing element 13, and the compressed air coming from the accumulating cavity 2 into the chamber 9 working stroke, affects the entire effective area of the piston of the impactor 8. There is a jump-like increase (approximately 20-25 times) of the effective area

0

five

0

five

0

five

0

five

0

five

and as a result of this, the shock effect of compressed air on the piston-hammer 8, after which the latter moves downwards (see drawing) and at the end of the stroke performs work. At the beginning of the stroke of the piston 8, the pusher 16 moves away from the ball 17 and the check valve closes, stopping the supply of compressed air from the main to the accumulating cavity 2. This ensures a rational batch supply of compressed air, eliminating direct emission of compressed air into the atmosphere. At the end of the stroke of the piston of the impactor 8, the drainage radial channels 4 are in the chamber 9 of the stroke, due to which the exhausted compressed air from the chamber 9 of the stroke and the accumulating cavity 2 is dropped Into the atmosphere, they are emptied to near atmospheric pressure. Drainage of these cavities (chambers) is provided by a jump-like change in effective areas, since the ratio of the total area of the impactor piston 8 to the area of the output channel 6 determines the ratio of the initial and minimum pressures at which the impactor piston 8 is kept in its lowest position (see drawing ). There is a delay in time required for the process of emptying the cavities (chambers). Emptying the cavities (chambers) is a prerequisite for the unimpeded return of the impactor piston 8 to its original position, i.e. in the absence of an air cushion, the return spring 7 should be sufficient only to seal the lock (seat 12 with sealing element 13).

The piston-hammer 8 after depressurising the pressure in the chamber 9 of the working stroke and the accumulating cavity 2 returns to its initial position. The remains of compressed air from the working stroke chamber 9 through the annular gap between the piston-hammer 8 in the area of its annular flange 18 and the hollow body 1 are vented into the idling chamber 10 and through the drainage radial channels 4 into the atmosphere.

After closing the lock, i.e., the seat 12 and the sealing element 13, atmospheric pressure is established in the working travel chamber 9, the non-return valve in the form of a spring-loaded ball 17 is opened, and the accumulating cavity 2 is filled from the compressed air line. The filling time and, therefore, the frequency of impacts depends on the setting of the adjustable throttle 19.

Then the cycle repeats automatically.

Claims (1)

Invention Formula A pneumatic hammer containing a hollow body with successively located accumulating and working cavities with drainage radial channels connected to the working cavity, and with input and output channels connected to the accumulating cavity, located in the latter axially spring-loaded piston-hammer, dividing the working a cavity in the working and idling chambers, characterized in that, in order to stabilize the impact energy by regulating the pressure of compressed air, it is provided with a lock for holding the piston darnik in the form placed between the accumulating cavity and the working chamber of the radial septum with a saddle facing the piston-hammer and sealing an element mounted on the end of the piston facing the saddle of the impactor, a check valve placed in the inlet channel and connected to the piston-drummer, and the latter is provided with an annular flange forming a labyrinth seal with the inner surface of the housing.