SU1579764A1 - Compressed air hammer - Google Patents

Abstract

This invention relates to pneumatic percussion machines. The purpose of the invention is to increase the operational capabilities of the hammer. When the air distributor 2 is on, compressed air through channel 19, the annular gap of valve 18 and channel 9 enters the idle chamber 6 and increases the pressure in it, while the hammer 5 makes an idling motion. When the exhaust channel 10 is opened by the rear end of the hammer 5, the exhaust occurs, the pressure in chamber 6 drops to atmospheric, and pressure increases in chamber 7, the annular valve 18 switches to working stroke, and air flows through channel 8 into working chamber 7, increasing the pressure in it, the drummer 5 makes a working stroke and strikes the working tool 20. At the same time, part of the compressed air through the channel 14 enters the cavity of the element 13, changing its rigidity and creating an intermediate air cushion between the barrel 3 and getting oh 11 which quenches arising during operation of vibration. 1 hp f-ly, 3 ill.

Description

The invention relates to pneumatic percussion machines and can be used in mechanical engineering, construction, mining and other sectors of the national economy.

The purpose of the invention is to increase the operational capabilities of the hammer by placing tubular elements of the required dimensions in the barrel, depending on the required impact power.

Fig, 1 shows a pneumatic hammer, a general view; 2 is a section A-A in FIG. one ; on fi.Z - section bb in figure 1 ..

The hammer contains a handle 1 with an air-distributing device 2, a barrel 3 with a lid 4 and a drummer 5 dividing it into the chambers of the worker 6 and idle 7 strokes filled with air through channels 8-10, which are made in tubular elements 11 arranged in the barrel 3 and 12, with channels 8 and 10 in the tubular element 11, and channels 9 in the tubular element 12, which are, for example, metal tubes.

Between the tubular elements 11 and 12, an element 13 is installed with variable stiffness, made, for example, in the form of an elastic shell with a supply through the channel 14 of compressed air. The tubular element 11 is designed to regulate the hammer's shock power. Depending on the required impact power and the diameter of the impactor, the tubular element 11 may be replaced.

Oil-resistant rubber and polymeric materials can be used as an elastic shell.

To suppress noise during exhaust air from the barrel cavity 3 and fixing the handle 1 on the barrel 3, a protective shield 15 is provided. 3, an annular valve 18 is installed, to which compressed air is supplied through channel 19.

1 Hammer also contains a work tool 20.

The hammer works as follows.

When the air distributor 2 is on, compressed air from the network is

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Nalam 19 through the annular gap of the valve 18 and through the channel 9 enters the idle chamber 6 and increases the pressure in it, while the hammer 5 makes an idling. When the exhaust channel 10 is opened by the rear end of the hammer 5, the exhaust occurs and the pressure in chamber 6 drops to atmospheric. The inertia impact shock absorber 5 compresses the air in the working chamber 7.

Under the action of the counterpressure from the working stroke chamber 7, the impact nick 5 slows down its movement, completing the idle stroke, while the ring valve 18 switches to the working stroke, and the air enters channel 8 of the working stroke chamber, increasing the pressure in it . The hammer 5 makes a working stroke, providing exhaust and a blow at the working tool 20 at the end of the working stroke. Under pressure from the idling chamber 6 valve 18 moves to idle and the cycle repeats.

At the same time part of the compressed air through the channel 14 enters the cavity of the element 13, changing the rigidity of the latter, creating an intermediate air gap between the barrel 3 and the insert 11, which dampens the transverse and longitudinal vibrations arising during operation by about 1-5 dB and external noise -5 dB, thereby increasing the performance of the hammer.

When the air distributor 2 is turned off, the hammer stops working.

Repair of the barrel 3 is performed by replacing the worn insert 11 with a new one. Similar replacement of one insert 11 with another one with a smaller or larger diameter provides for the regulation of the hammer's impact power, which expands the performance of the hammer.

Claims (2)

1. A pneumatic hammer containing a handle with an air-dispensing device, a barrel with a hammer placed in it, dividing it into working and idling chambers filled with air through channels, characterized in that, in order to increase operational capabilities, it is equipped with in the barrel are tubular elements and a variable stiffness element installed between them, and the channels are made in tubular elements. 2. Hammer according to claim 1, distinguished by the fact that the element of variable stiffness is made in the form of an elastic shell with a supply of compressed air. FIG. 2 Editor A. Shandor Compiled by B. Maloy Tehred M. Khodanych Order 1983 Circulation 668 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology CQCP 113035, Moscow, Zh-35, 4/5, Raushsk nab. Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 5-6 // 0U9.J Proofreader M. Pojo Subscription