Abstract: Sealing apron device for a moving conveyor belt or loading trough of a belt conveyor, has at least one mounting plate which is fitted above the belt and which has a vertically adjustable sealing apron on a side wall. The underside of the apron interacts with the belt for sealing, and the sealing apron comprises a number of adjacent sections which are vertically slidable relative to each other on the mounting plate by means of slide guides on the mounting plate and the apron sections respectively. Each apron section is so fixed to the mounting plate with a clamping plate or bracket and fixing members that an apron section is clamped between the clamping plate and the mounting plate. A friction element between the clamping plate and sealing apron sections permits a downward movement of the section relative to the mounting plate, but impede an upward movement thereof.

Abstract: An air cannon which includes a pressure tank with an inlet opening and an outlet opening for air, whereby the outlet opening is composed of a tube which is airtightly fastened in the wall of the pressure tank and the one open end terminates inside the pressure tank and the other open end extends out of the pressure tank. A cylindrical shaped second tube is fixed in the pressure tank with an open end and a closed end, generally concentric to the mentioned first tube, of which the cross section is larger than the cross section of the first tube. The first tube extends through the open end into the inside of the second tube, and is generally concentric to it. In the bottom of the second tube there is provided an in and outlet opening for the in and outflow of air.