Patent ID: 6524171
Filing Date: 2003-02-25
Classification: B24C,Y02P

Abstract:
A blasting works recovery system, which comprisesa perforated floor, which defines a space below the perforated floor for receiving blast material, and at least one elongated, substantially horizontal, upwards opening chute, having two side walls, arranged in the space, each chute having an elongated cover element having two elongated free side edges positioned over the chute; the chute and the cover element defining between them a discharge channel for the blast material, wherein the discharge channel is in fluid communication with a classifier and a blower for transporting blast material from the space below the floor to the classifier; the system further comprising a plurality of pneumatic cylinders and a plurality of spiral springs, wherein a combination of two spiral springs arranged on both sides of each pneumatic cylinder is configured and adapted to act cooperatively, such that, upon movement of the pneumatic cylinders they provide a force in an upwards direction to facilitate movement of the elongated cover element vertically between a lower position and a raised position, the spiral springs provide a force in an upwards direction corresponding to that of the vertical force provided by the pneumatic cylinders, thereby moving the elongated cover element vertically together with the pneumatic cylinders, wherein, in the lower position, the side edges of the cover element engage the side walls of the chute and, in the raised position, the side edges of the cover element are at a distance from the side walls of the chute, thereby forming elongated suction gaps between the side walls of the at least one chute and the side edges of the cover element for leading the blast material to the discharge channel.