SU437352A1 - Pneumatic hammer - Google Patents

Description

one

The invention relates to mechanical engineering and is intended for use in mining and construction as a percussion instrument.

A pneumatic hammer is known that contains a pneumatic pillow fitted with an exhaust hole with a plunger-hammer installed in it, a tool with a cylindrical head entering a pneumatic cylinder, and an air distributor device installed in the form of two micro-hammers controlling the working and reverse stroke of the plunger hammer installed. cylindrical holes made in the upper part of the walls of the pneumatic cylinder connected to the compressed air supply line.

The purpose of the invention is to increase the efficiency of the hammer.

To do this, an additional radial hole is made in the pneumatic dilil steak between the exhaust hole and the cylindrical head of the tool, which is connected to a cavity located in the cylindrical hole above the microgut that controls the return stroke of the plunger impactor, while the plunger-drummer is made with an annular groove, the width of which is greater than between the exhaust and additional holes along the axis of the cylinder.

The drawing shows the scheme described hammer.

It consists of a housing 1, in the cavities of which the piston 2 moves. At the moment of impact, the energy of the piston is transferred to the tool. Compressed air is supplied to the front and rear cavities by using spools 3 and 4, which move in spools A and B. In chamber B there is a sleeve 5, which is held by cover 6. When the trigger is turned on (not shown), compressed air is supplied to openings a, b, c, l, n

The device works as follows.

At the lower location of the piston and spools, compressed air enters through the orifices and, and into the front cavity, pushes the spool 4 up and opens the orifice to. With the upper arrangement of the piston and spools, the hammer is started using the channel and.

At the beginning of the working stroke the firing pin (piston, firing pin) is located in the extreme upper position, and the slide valve in the extreme lower positions. The air from the distribution chamber through the channel and enters the cavity of the barrel and begins to displace the piston down. The spool 3 at this time is under the action of forces, the resultant of which holds it in the lower position. Upon further downward movement of the piston, there comes a moment when its upper edge opens the aperture. Under the action of compressed air pressure on the lower end, the valve 3 moves upwards and closes the channel a. There is a cutoff of compressed air from the network. Further advancement of the piston occurs due to the expansion of air, which is located in the rear cavity. Having blocked the exhaust hole with the front edge, the piston compresses the air, which through the channel and the hole acts on both end surfaces of the valve 4. Under the effect of the resultant force, it is in the lower position. The spool 4 moves to the upper position when the pressure in the channel drops. This occurs when the channel g communicates with the exhaust hole e. At this time, the piston strikes the tool shank.

Reverse. The spool 4 occupies the upper position, the compressed air through the open hole to fall into the front cavity of the hammer and moves the piston up. When the front edge of the piston opens the channel g, the pressure of compressed air is transferred to the upper end surface of the spool 4 and under the action of the resultant force, the latter moves downward, closes the opening to. At the same time, access of the compressed air to the front cavity is stopped. Further movement of the piston occurs due to the expansion of the air in the front cavity. As soon as the rear edge of the piston 2 closes the opening, the air in the rear cavity is compressed, the valve 3 moves down and opens the opening a. Compressed air from the network enters the rear cavity and the cycle repeats. In the course of the movement of the norn and up and down, the disconnection from the line is made before the corresponding cavity is connected through the exhaust ports to the atmosphere. This makes the hammer economical in terms of air flow.

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Claims (1)

Invention Formula A pneumatic hammer containing a pneumatic cylinder with an exhaust hole and a plunger-hammer, a tool with a cylindrical head entering through a hole in the lid into the pneumatic cylinder, as well as an air-distributing device made in the form of two micropoles controlling the working and reverse stroke of the plunger-hammer longitudinal cylindrical holes made in the upper part of the walls of the pneumatic cylinder and connected to the compressed air supply line, characterized in that In order to increase efficiency, in the wall of the pneumatic cylinder, along the movement of the plunger-hammer, there is a radial hole connected to the part of the cylindrical hole located above the microgun, controlling the return stroke of the plunger-hammer, while the plunger-hammer is made with an annular groove, the width of which is greater than nor between the exhaust and the radial holes along the axis of the cylinder.