| 摘要 |
The invention relates to crane building, in particular to the multiplex hoisting tackles. A hoisting tackle contains lower and upper horizontal axles of hoisting tackle with freely-rotating blocks, a rope reeved with a wrap of lower and upper blocks with possibility of introduction of a hook suspension into the cavity of boom head, one end of the rope is fastened by a wedge bushing to the boom head and second end of the rope is connected to a drum of cargo winch. In the cavity of the boom head a part of upper blocks of hoisting tackle relative to the lower axle of its blocks is installed at an angle in vertical planes of arrangement of diametrically opposite channels of adjacent lower blocks. Each block installed at an angle is diametrically enclosed by a frame with the end edges and with separate axle of free running of block. In the perimeter of the walls of the boom head vertical grooves are made which are opened from below and correspond to the edges of the frame with possibility of arrangement of edges in the grooves. The grooves opened from above are made opposite on the upper edge of the perimeter of walls of hook suspension, which correspond to the width of the frame with possibility of arrangement of the frame in the grooves. From the front and from behind the boom head the ends of the edges of frame appear outwardly and are installed on the supports installed on the boom head with possibility of fixing or releasing the edges relative to the boom head by a separate drive. Technical result: simplification of change of the multiplicity of hoisting tackle. |
