SU473663A1 - Lifting head jib - Google Patents

Description

one

The invention relates to the field of boom equipment of cranes.

Known tip of the boom crane, containing mounted on the adjustable axis of the pulleys, skirted rozhalnym cable boom polyspast.

A disadvantage of the known device is the lack of automatic adjustment of the eccentricity of the application of the force of the connecting cable relative to the center of gravity of the boom section.

To automatically adjust the eccentricity of applying the effort of the rope cable relative to the center of gravity of the boom cross section, in the proposed head, gears and traverse bars are mounted on the pulley axis, and gear racks, input gears, and gears along which move along traverse with axle.

In addition, the pulleys can be made with an asterisk, the sections of the ropes in contact with them are made of a multi-link chain.

FIG. Figure 1 shows the two extreme halves of the crane boom with the proposed tip and view along arrow A; in fig. 2 shows an arrowhead, a section along BB in FIG. one; in fig. 3 is a view along arrow B in FIG. 2

In the head part of the boom 1, gear racks 2 n are attached to the metalwork, along which guides 3 are parallel to them. Trailing slides 4, in the slots of which there is an axis 5 of pulleys 6. Gears 7 are engaged on the axis of the pulleys engaging with the racks 2. Rachalny the rope 8 bends around the equalization block 9 of the movable cage of the boom hoist 10, slung over the pulleys 6 and is fixed at both ends on the portal of the crane or on the lower cage of the boom hoist.

The rope 8 is stocked up so that its upper branch 11 from the pulley 6 goes to the equating unit 9, and the branch 12 is attached to the portal. Thus, the upper branch of the rope is movable.

In the extreme upper position of the boom, the axis of the pulleys 6 is set with such an eccentricity relative to the center of gravity of the boom cross-section so that the moment from the force in the cargo polyspast is balanced by the moment from the force in the folding cable. With increasing luffing jib boom

the hoist extends, its movable sleeve moves toward the boom tip. The upper leg 11 of the pitching rope 8 is shortened, the lower leg elongates 12. Due to this movement of the rope, the pulleys 6 are rotated clockwise. Sitting

on the axis 5 of the pulleys, gear 7 rolls along the toothed racks 2 and cause the axis to mix by traverse 4 along the direction 3. In this case, the eccentricity is reduced, and in the lowest position of the boom, axis 5 lies on the same side as the cargo section from the center of the body of the cross section of the arrow.

With decreasing luffing, the rope 8 turns the pulleys in the opposite direction and their axis 5 is turned back.

In order to improve the pulleying of the pulleys with the pitching rope and thus eliminate their possible mutual slippage, the pulleys are made in the form of an asterisk 13, and the rope sections that engage with them are made of a multi-link chain 14.

Subject invention

Claims (2)

1. The boom head of a lifting crane, containing mounted on a perestavnoy the pulleys axes around the boom rope of the boom polyspast, characterized in that, to automatically adjust the eccentricity of applying the booster rope relative to the center of gravity of the boom section, gears and traverse bars are mounted on the pulleys axle, and gear rails on the pulley axle are mounted, gears and guides along which the traverse with the axles moves. 2. A head according to claim 1, characterized in that the pulleys are made with an asterisk, the rope sections in contact with them are made of a multi-link chain.