| 摘要 |
The invention relates to the crane building and concerns the design of jib cranes. The jib adjustable crane contains tractor, supporting frame with the rack for the gibbet and sliding supports, on which the mechanism of turning, cargo winch, gibbet equipment, control cab of crane installation and electric motor are mounted. The supporting frame is executed in the form of sleighs with two parallel runners, sidewalls of which are mutually distanced for the width of the transport overall sizes of crane and are equipped, at least, with four hooks with possibility of fastening by turnbuckles to the base of the area of the frame equilibrated on the stocks of extension supports, and with possibility of designing by each pair ôstock-turnbuckleö of pre-stressed compressed-extended supporting element. Through grooves are executed on the runners, mutually chamfered relative to the longitudinal axis of sleighs for the angle of 90 DEGREE -150 DEGREE ; internal ends of grooves anticipate external ones. The technical result consists in simplification of the design of undercarriage of supporting frame of crane and liberation of tractor in the period of stay of crane in stationary position.
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