SU467781A1 - Pneumatic head - Google Patents

Description

The invention relates to foundry, in particular, to devices for compacting molds with compressed air and knocking them out.

A known impulse head comprises a housing with a working cavity and an outlet opening, a stacked glass valve coaxially mounted to the head with a through hole in the bottom, indicating the working cavity of the head with a valve valve and the air distributor with a piston mounted along the axis of the glass-shaped valve.

However, when using this head, it is necessary to use an additional control cylinder with a drive distributor connected to a low pressure air line and control system.

The purpose of the invention is to simplify the design of the pneumatic head.

This is achieved by the fact that in the proposed pneumatic head a glass-like valve is located bottom upwards, in the cavity of which a spring-loaded air distributor plate is installed, equipped with a non-return valve for blocking the through-hole in the bottom of the glass-like valve.

The drawing shows a pneumatic head, a slit.

The head includes a housing 1, a cap 2, an exhaust valve 3, a saddle 4, an air distributor 5 with a piston 6, a lower valve 7, a spring 8, a check valve 9, a bottom of the exhaust valve 10, a valve 11, a throttle 12, a divider 13, a spring 14 and a saddle 15.

When the pneumatic head is turned on, the air from the pipeline through the choke 12 and the channel 16 enters the supravalveted cavity 17 and presses the exhaust valve 3 to the seat 15, opens the valve 11 and through the channel 18 enters the working cavity 19. After equalizing the pressures in the cavities 17 and 19 and reaching the required pressure, the air through the valve 11 acts on the check valve 9, compresses its spring and passes into the overpiston cavity 20, lowers the piston 6 of the air distributor 5 and opens the valve 7. Between the saddle 4 and valve 7 there is a gap through which air from the over-valve cavity 17 through the channels of large section 21, the chaff cavity 22 is ejected into the cavity above the divider. At the same time, the exhaust valve 3 under the action of compressed air in the cavity 19 rises and closes the channel 16, and the air through the gap formed between the exhaust valve 3 and the saddle 15 is ejected into the cavity above the divider and through the divider into the flask, compacted in her molding sand.

After the pulse, under the action of springs 8 and 14, the air distributor 5 and the exhaust valve 3 return to their original position, thus opening channel 16 through which air again enters the over-valve cavity 17. The frequency of the pulses is controlled by supplying air from the main line with throttles 12.

Then the cycle repeats.

Subject invention

A pneumatic head for the manufacture of molds, mainly casting ones, by means of a compressed air pulse, comprising a housing with a working cavity and an outlet opening blocked by a cup-shaped valve coaxially mounted with the head with a through hole in the bottom, and an air distributor with a piston, which, in order to simplify head design, the glass-like valve is located bottom up, in the cavity of which a spring-loaded piston of the air distributor is installed, equipped with a check valve for shutting off and the through hole in the bottom of the cup valve.

/four