SU933443A1 - Pneumatic hammer - Google Patents

Description

one

The invention relates to pneumatic percussion instruments and can be widely used for the mechanization of manual labor in the shipbuilding, engineering industries, as well as in transport, in public utilities.

Known pneumatic scraper, in which the drummer, making a reciprocating movement under the action of the energy of compressed air, strikes the worker's shank

Compressed air supply

the instrument is regulated by the air inlet and dispensed with a convenient device. which automatically distributes compressed air through the working and idling chambers of the firing pin and exhaust air discharging into the atmosphere L U

The disadvantage of this hammer is continuous vibration during operation. In addition, for reversing the movement of a hammer in such a hammer,

reduce the pressure in the chamber above the hammer by opening the exhaust ports. As a result, the pressure in the chamber drops, while aerodynamic noise arises due to high air flow rates.

The closest to the technical essence of the invention is a pneumatic hammer containing a barrel with air distribution channels and two cameras, one of which is permanently connected to a source of compressed air, a hammer located in the barrel with a shaft having an axial shaft and two radial channels communicated with it, one of which communicates with a chamber associated with a source of compressed air, an annular valve covering the hammer shaft and periodically closing the second radial channel 2j.

Claims (2)

The disadvantage of this hammer is high vibration, affecting labor productivity, as well as 3E, a significant level of aerodynamic noise. The chain of the invention is to increase productivity and reduce hammer noise. The goal is achieved by the fact that the tail of the firing pin is made with two annular grooves, periodically communicated with the bore channels, and third radial channels communicated with the main bore of the firing stem and the second bore chamber. The drawing shows a pneumatic hammer at the time of the working movement of the drummer. The hammer contains a barrel 1 with extended air distribution ducts 2 and 3, radial channels k and 5 and two chambers 6 and 7, with chamber 6 communicating with a source of compressed air through a rubber nipple 8 and channel 9, made in handle 10, placed in barrel 1 hit nickname 11 with a shank 12 having an axial channel 13 and two radial channels I and 15 communicating with it, channel 1 communicating with camera 6, a ring spool 16 covering the shank 1 and periodically overlapping the radial channel 15, the shank 12 is made with two annular grooves 17 and 18, Periodically communicates with the channels 4 and 5 of the barrel 1, and the third radial port 19 communicating with the chamber 7 of the barrel 1. The barrel 1 and between the handle 10 is mounted a spring 20. The hammer forms a stem 1 22 and the cavity 21 of the working and idle strokes. On the barrel 1 is made exhaust manifold 23 dp exhaust air. The chamber 7 has three working windows, 25 and 26. The ring spool 16 has an annular groove 27 and divides the chamber 7 into two cavities 28 and 29. In the handle 10, a groove 30 is made inside of which a spring-loaded retainer 31 is installed, fixing 1 from turning relative to the handle 10. 8 of the lower part of the barrel 1 is installed a bush 32 for fastening the shank of the working tool 33. The bush 32 is axially displaced relative to the trunks, and in the resting state of the bush 32 is spring-loaded with a rubber shock absorber. The pneumatic hammer keeps track yuschim manner. When the trigger is turned on (not shown), the compressed air flows through the channel 9 through the rubber nipple 8 into the chamber 6, from where window 2k enters the working cavity 21, causing the firing pin VI to move downwards, causing the firing pin 11 to hit the tip tool 33. Exhaust air from cavity 28 exits through working window 25 and further along annular groove 27 spool 16 goes to atmosphere through collector window 25 23. Impact drum 11 moves down until channel 19 is closed by spool 16, and radial channel 15 will not open in cavity 29. At the same time, the groove 17 will connect cavity 28 through channel 5 to the atmosphere, and as a result of the pressure differential. In cavity 29 and 28, the ring spool 16 will move up to the stop, and exhaust air from cavity 28 will be forced out through channel 5 into the atmosphere. At the end of the stroke of the spool 16, upward the cavity 21 through the working window 24, the annular groove 27 of the spool 16 and the groove 17 communicate with the atmosphere, and the cavity 21 through the working window 25, cavity 29, the radial channel 15 and the axial channel 13, the chamber 6 - with a pressure source . I As a result of these switching links, the impactor 11 moves upward until channel 15 overlaps with the ring spool 16 and channel 19 does not open in cavity 28. At the same time, groove 18 connects cavity 29 through channel 5 to the atmosphere. The cycle is repeated. Thus, in this pneumatic hammer of the hammering action, when the compressed air is supplied, an automatic periodic reciprocating motion of the striker occurs, which ensures the operation of the pneumatic hammer. Dp reliable reversal of the movement of the hammer 11, the internal diameter of the ring spool 16 is made a length equal to the distance between the axes of the radial channels 15 and 19. This allows the pneumatic hammer to start up reliably at any relative position of the hammer 11 and the ring spool 16. The invention ensures into the atmosphere only exhaust air (i.e., the air supply cavity is practically not connected to the atmosphere), therefore the consumption of compressed air in the proposed pneumatic tray is less than what is known hammers with the same impact power. In addition, the speed of exhaust air from the exhaust holes is lower than the same speed in the known hammers, so the level of aerodynamic noise, respectively, lower. The invention includes a pneumatic hammer containing a barrel with air distribution channels and two chambers, one of which is permanently connected to a source of compressed air, a hammer located in the barrel with a shank having an axial shaft and two radial channels communicating with it, one of which is connected to a chamber associated with a source of compressed air, an annular valve, covering the drummer shank and periodically overlapping the second radial channel, characterized in that, in order to increase productivity and reduce ur ext noise impactor shank formed with two annular recesses intermittently communicating with the bore, and the third radial passage communicating with the axial passage of the shank of the impactor and the second chamber of the barrel. Sources of information taken into account in the examination 1. The author's certificate of the USSR on the application If, cl. In 25 O E / 1978. 2. Authors certificate of the USSR N 506495, cl. In 25 About 9/1, 1970 (prototype).