DE3509364A1 - LIFEWAY FOR JUMPER CRANES, ESPECIALLY WITH TELESCOPIC BOOM - Google Patents

Description

Luffing gear for jib cranes, especially with telescopic jib

The invention relates to luffing mechanisms for jib cranes, in particular with telescopic jibs, whose outreach is carried out hydraulic working cylinder is adjustable.

Jib cranes are known in which the jib is designed as a horizontally lying bending jib and hydraulic working cylinders are arranged for luffing the boom.

The luffing cylinder is arranged with different Installation angles and installation positions.

There are devices known whose luffing cylinder to achieve the largest possible luffing angle almost are arranged parallel to the horizontally lying boom.

The disadvantage of this solution is that the use of such a jib crane in a horizontal operating position of the telescopic boom does not allow a load with an operating load, but only when it is luffed Cantilever position allows certain loads. Under bridges, overhead lines and in tunnels is a such jib crane can only be used to a limited extent.

When arranging the cylinder, under a larger one The angle to the horizontally lying boom is the load of the jib crane is possible in this working position, but the disadvantage is a smaller luffing area achieved (DD-PS 136 606).

Another solution is known as a rocker cylinder telescopic hydraulic cylinders are arranged. This design has the disadvantage that special cylinder

the execution is necessary and the load-bearing capacity of the Jib crane is determined by the telescopic graduation.

According to DE-OS 2528802, another arrangement is the Rocking cylinder known. With this solution, the boom bearings and the luffing cylinder are on an additional mounted hydraulically adjustable carrier. This solution has the disadvantage that a burden on the Jib crane is not possible with the jib position in the horizontal position. It can be used under contact lines, Bridges and in tunnels do not take place.

The aim of the invention is to expand the usable working area for a jib crane with a luffing cylinder and to ensure its operational capability under spatially restricted working conditions.

The invention is based on the object of a luffing cylinder arrangement for jib cranes with both a load capacity in the horizontal operating position the telescopic boom and a very steep luffing angle is achieved.

According to the invention the object is achieved in that the Bearing points in a known manner between the telescopic boom and the upper part of a boom crane arranged luffing cylinder on the telescopic boom or on the upper part of the crane or both can be moved longitudinally together are formed, the bearing points of the luffing cylinder in the one arranged on the telescopic boom and / or on the crane upper part Guides are articulated to be longitudinally displaceable. To move the bearing points in the guides are Power actuators between the crane top and / or the telescopic boom and the bearing point on Telescopic boom or provided between the upper part of the crane and the bearing point of the luffing cylinder on the upper part of the crane.

ORIGINAL INSPECTED

According to the invention the object is also achieved in that for moving the bearing points of the tilting cylinder in the Guides on the telescopic boom, a tension element is provided as a coupling between the upper part of the crane and the bearing point, if there is an acute angle between the telescopic boom and the luffing cylinders.

When the luffing cylinder is extended, the pulling element takes place the displacement · of the articulation points of the luffing cylinders in the direction of the upper part of the crane.

In the arrangement of power actuators, the Shifting of the bearing points on the boom or crane superstructure in the direction of the crane superstructure or in the opposite direction without Actuation of the extension movement of the luffing cylinder.

The invention is explained below using exemplary embodiments. The accompanying drawings show:

Fig. 1: Side view of the jib crane with horizontal Operating position of the telescopic boom,

Fig. 2: Side view of the jib crane in the operating position with luffed telescopic boom and tension element,

Fig. 3: Side view of the jib crane in the operating position with luffed telescopic boom and additional hydraulic working cylinder, Fig. 4: Side view of the jib crane in the operating position with luffed telescopic boom and additional hydraulic working cylinder at the bearing point of the luffing cylinder on the upper part of the crane.

1 shows a jib crane 3, the telescopic jib 1 of which is articulated on the crane upper part 2 at the pivot point 4 is stored. The luffing cylinders 5 are attached to the crane upper part 2 at the bearing point 7.

The bearing point 6 of the luffing cylinder 5 is on the telescopic boom 1 arranged to be longitudinally displaceable and held in a guide S on the telescopic boom 1.

Between the bearing point 6 of the luffing cylinder 5 and the crane 5 Upper part 2 of the jib crane 3, a tension element 9 is provided as a coupling (Fig. 1). When luffing up the telescopic boom 1 through the tension element 9, the bearing point of the luffing cylinder 5 is inevitably in the direction of the upper part of the crane 2 moved in the guide 8. The luffing cylinders 5 thereby describe the swivel radius IO of the tension element 9 and move the telescopic boom 1 on the predetermined pivot radius 14 (Fig. 2). In FIG. 3, for the longitudinal displacement of the bearing point in the direction of the upper crane part 2, between the upper crane part 2 or the telescopic boom 1 hydraulic working cylinder 11 arranged as a pulling or pushing element. Fig. 4 shows the arrangement of the luffing cylinder 5 with the longitudinally displaceable bearing point 7 according to the invention, the is mounted in a guide 13 on the crane upper part 2.

Between the crane upper part 2 and the bearing point 7, working cylinders 12 are arranged for displacement.

The solution according to the invention increases the load capacity of the jib crane 3 in the operating position of the horizontally lying telescopic boom 1 with an operating load guaranteed and thus its replaceability in spatially limited workplaces, e.g. under Bridges, overhead lines and in tunnels. This advantage is achieved with the achievement of a steep rocking angle tied together.

ORIGINAL INSPECTED

List of the reference symbols used:

1 Telescopic boom 2 Crane top 3 Jib crane 4th pivot point 5 Luffing cylinder 6th Bearing point 7th Bearing point 8th guide 9 Tension element 10 Swing radius 11th Working cylinder 12th Working cylinder 13th guide 14th Swing radius

Claims (5)

Patent claims: 1. luffing gear for jib cranes, especially with telescopic booms, its luffing cylinder in a fixed angular position between a crane upper part or a adjustable carrier and a horizontally lying telescopic boom are arranged, the luffing cylinder are articulated in pivotable bearing points, characterized in that the bearing points (6; 7) of the hydraulic luffing cylinder (5) are longitudinally displaceable in guides (8; 13). 2. luffing mechanism for jib cranes according to claim 1, characterized in that the hydraulic working cylinder (11) between the bearing point (6) of the luffing cylinder (5) and the upper part of the crane (2) and / or the telescopic boom (1) for longitudinal displacement of the bearing point (6) lie in the guide (8). 3. luffing mechanism for jib cranes according to claim 1 and 2, characterized in that the hydraulic working cylinder (11; 12) between the bearing point (6) and / or the bearing point (7) and the crane upper part (2) are arranged. 4. luffing mechanism for jib cranes according to claim 1, characterized in that tension elements (9) between the longitudinally displaceable bearing point (6) on the telescopic boom (1) and the upper part of the crane (2) with an immovable bearing point (7) in the most effective case as an angle bisector of the acute angle between telescopic boom (1) and luffing cylinder (5) are arranged. 5. luffing mechanism for jib crane according to claim 1 and 4, characterized in that the tension elements (9) preferably in the bisector of the horizontal lying telescopic boom (1) and luffing cylinder (5) are formed at an angle.