Patent ID: 8210457
Filing Date: 2012-07-03
Classification: B23D,B30B

Abstract:
1. A scrap shearing machine for shearing a metal scrap into a plurality of short scrap pieces, comprising: an open feed channel having two opposite sidewalls to form a rectangular parallelepiped space; a straight-blade shear-stand which is disposed at one end of the feed channel, and which has a pair of blades arranged to cooperate with each other to shear the metal scrap, and a mouth narrower than an inside width of the feed channel between said sidewalls; a downward hydraulic ram for downwardly squashing the metal scrap in the feed channel; a side hydraulic ram for moving at least one of said sidewalls towards the other of said sidewalls whereby the metal scrap placed in the feed channel can be squashed sideways before feeding the metal scrap into the mouth of the shear-stand; a feeder for feeding the metal scrap into the mouth of the shear-stand after said metal scrap has been squashed sideways by the side hydraulic ram in the feed channel; and a control unit which controls respective drive systems of the shear-stand, the feeder, the side hydraulic ram, and the downward hydraulic ram, in accordance with a predetermined operation sequence; wherein said side hydraulic ram is situated adjacent to the mouth of the shear-stand and is arranged to squash the metal scrap in front of the mouth only at a certain limited longitudinal section which is shorter than the overall length of the scrap in the longitudinal direction of the feed channel so as to squash the metal scrap to a final width no greater than the inside width of the mouth; and wherein said downward hydraulic ram has a same width dimension as the inside width of the feed channel, and said downward hydraulic ram is associated with said side hydraulic ram adjacent to the mouth of the shear-stand and is arranged to downwardly squash the metal scrap in front of the mouth only at a certain limited longitudinal section which is shorter than the overall length of the scrap in the longitudinal direction of the feed channel so as to squash the metal scrap to a final height no greater than the inside height of the mouth of the shear-stand; and wherein the control unit controls said downward hydraulic ram to downwardly squash the metal scrap prior to a squashing operation of said side hydraulic ram.