The invention relates to the locks of the bunkers of bulk materials. A lock of bunker is made in the form of a pneumatic tube connected to a source of compressed air and located in the discharge tube of the bunker. In accordance with the invention, a chamber is made from rubber-cord cloth, it has meridian corrugations, and it is connected by polar part to the tube for supplying of compressed air and suspension of the chamber. The tube is located along vertical axis of the discharge tube and is fastened in the upper part of the bunker. The invention provides increase of device reliability.
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