SU406476A1 - Pneumatic hammer drill - Google Patents

Description

The invention relates to machines for hitting and can be used in pneumatic jackhammers, drilling, submersible hammers, as well as other pneumatic impact mechanisms used in the mining industry. According to the main author. St. No. 247179 is known for a pneumatic flow, including a cylinder, calibrated channels, constantly communicating the chambers of the working and idling passages with a network of compressed air, and a drummer. Since the cross sections of the inlet channels and the volumes of the working chambers in this chamber are randomly selected, it has an increased air flow per unit of power. The proposed hammer is characterized in that the flow passages of the channels are selected in accordance with the ratio f j - f - j x x where f p. K - coefficient of proportionality. Equal 0.15-0.5; w - the volume of the camera working stroke; Wj is the volume of the idle chamber. In such a pneumatic hammer, the specific consumption of compressed air is reduced. The drawing shows a diagram of a pneumatic hammer. The machine consists of a cylinder 1, a drummer 2 and a tool 3. A drummer divides the cylinder cavity into a working stroke chamber 4 having a volume Wp and an idling chamber 5 with a volume of ... Both chambers are constantly communicating with a network of compressed air calibrated channels (throttles) 6 and 7. Channel 6 is used for communication with the network of the camera stroke and has an effect. The effective flow section f, channel 7, communicates with the network the idling chamber and has an effective flow section f ,. The exhaust from the chambers is carried out alternately depending on the position of the hammer 2 and the exhaust channel 8.

Pneumatic flow in one way.

Compressed Voauh. from the network via channels 6 and 7 simultaneously enters the cameras 4 and 5 of the dipyndra. The pressure in the chamber of the working stroke is equal to atmospheric pressure (exhaust canap is open). In the idle chamber, the pressure increases dramatically and the drummer moves up.

From the moment the exhaust duct is closed by the exhaust duct in the working stroke chamber, the process of compression will begin with simultaneous supply of compressed air through duct 6 from the network. At some point in time, drummer 2 opens the exhaust channel 8, as a result of which the exhaust from chamber 5 occurs, the pressure in it drops sharply, and the drummer continues to move upwards by inertia. In the upper extreme position, it stops and, under the action of pressure from above, starts moving downward, making a working stroke.

At the moment when the drummer opens the exhaust duct in, exhaust from chamber 4 occurs and the pressure in it drops to atmospheric. In chamber 5, after closing the canal

BUT

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PA 8 begins the compression process with simultaneous intake of air from the network through the cannap 7.

Overcoming the back pressure of air in chamber 5, the drummer strikes the shank of the 5-tool.

Claims (1)

Invention Formula Pneumatic hammer on the author, St. No. 247179, characterized in that, in order to reduce the specific consumption of compressed air, the flow areas of the inlet ducts are selected in accordance with fp Wp by the ratio. - K;  TO where f is the flow area of the inlet channel into the working chamber; flow area of the inlet channel into the idle chamber; K - coefficient of proportionality, equal to 0.15-0.5; Wp is the volume of the working chamber; Wx is the volume of the idle chamber. R -/