SU965755A2 - Percussive pneumatic machine - Google Patents

Description

(54) PNEUMATIC MACHINE. UDARNSGO

one

The invention relates to mechanical engineering, in particular, to pneumatic percussion devices used in various industries, namely in construction, mining and the foundry industry.

According to the main author. St. No. 764969 a pneumatic percussion machine is known, containing a barrel with air duct and supply channels and an exhaust hole and located therein a drummer and a tubular spool t J

The disadvantage of this machine is to strike the shank of the working tool through an air cushion, which leads to a loss of energy of a single blow up to 10-15%.

The purpose of the invention is to increase the impact power.

The goal is achieved by the fact that the spool is made with a groove on the outer surface, which constantly communicates with the supply channel and periodically with the air-i supply channel, and in the barrel is made

ACTIONS

an additional exhaust port communicating with the spool bore during the working stroke of the hammer.

The drawing shows the proposed device.

The pneumatic percussion machine consists of cTBorfa 1, in which the drummer 2 and the two-stage tubular valve 3 are located with the possibility of axial movement. The drummer 2 is at the end

Claims (2)

10, the working stroke interacts with the shank of the working tool 4. The compressed air from the network of the gavel 3, having an annular groove 5, on the outer surface of the machine is supplied through air supply channels 6-8. The entry of compressed air into the chamber 9 of idling from the groove 5 of the valve 3 is carried out through the supply channel 10. The exhaust of the exhausted compressed air is carried out through the exhaust hole 11 and the additional exhaust hole 12. In the working stroke chamber 13 air is supplied through the channel 6. The machine works as follows. In the initial position, the drummer 2 and the spool 3 are in the lower position. As soon as compressed air from the network begins to flow into the machine, spool 3 due to compressed air entering through channels 7 and 8. into the chamber under the step of spool 3, occupies the upper position Compressed air from the network through the air supply channel 7, groove 5 in spool 3 and feed Punishing 10 enters the idle chamber 9. Under the action of compressed air, the drummer 2 idles. When the upper edge of the impactor closes the exhaust opening 11, free air begins to compress in the working chamber 13. Continuing movement, the impactor 2 opens the exhaust opening 11 with its front edge and the compressed air exhausts from the idle chamber 9. The pressure in it drops practically up to atmospheric., Drummer 2, continuing to move by inertia, compresses the free air in the chamber 13 of the working stroke, 1 {the second through the additional exhaust hole 12 is partially released into the atmosphere according to a given law. with compressed air brakes drummer 2. When drummer 2 enters spool 3, opening Z. will be blocked and a sharp increase in pressure will occur in the working stroke chamber, which will stop striking nick 2 and transfer spool 3 to its lowest position. At the same time, it closes off the air supply channel 8 and opens channel 6, through which compressed air begins to flow into the chamber 13 of the working stroke. Under the action of compressed air, the impactor 2 makes a working stroke. When the leading edge of the firing pin closes the exhaust port 11 in the idling chamber 9, the pressure begins to increase due to the compression of free air, 1Y through the supply channel 10, the annular protrusion 5 of the spool 3 q exhaust port 11 partially emitted into the atmosphere. Continuing the movement, the rear edge of the hammer opens the exhaust port 11 and the working chamber 13 is in communication with the atmosphere. The pressure in this chamber drops almost to atmospheric. Drummer 2 strikes the shank of the working tool 4. Under the action of compressed air, coming from the network through channels 7 and 8, the valve is moved to its extreme upper position. After which the cycle is repeated. The use of the invention will make it possible to increase the stroke of the striker by reducing the airbag in the working stroke chamber, to increase the impact energy both by increasing the stroke of the striker and by reducing the airbag in the idle chamber. Ultimately, this allows you to create a machine with the same Energy parameters of smaller dimensions and weight, which is very important for hand tools. Formula from et e and Pneumatic percussion machine for. auth. St. No. 764969, characterized in that, in order to amplify the shock power, the spool is made with a groove on the outer surface, which constantly communicates with the supply channel and periodically - with the air supply channel, and an additional exhaust port is made in the barrel, which communicates with the groove of the slide when working during the drummer. Sources of information taken into account in the examination 1. USSR Author's Certificate No. 764969, Krt. In 25D 9/00, 1976 (npOTOTHSn).