DE102017003354A1 - Device for erecting and depositing luffing supports of mobile cranes - Google Patents

Abstract

The present invention relates to a mechanism that minimizes the effort when erecting and storing lattice boom cranes. By a limited opening of a luffing support at a suitable location, for example. In the middle, the force required when erecting and dropping can be significantly reduced. The luffing support is this fixed by means of lifting and mounting part at a favorable angle. Reducing the required force results in significant savings in terms of material and machinery used, as well as the time required to build lattice boom cranes.

Description

The invention relates to a mechanism for erecting rocking supports

Technical area:

Mobile lattice boom cranes and telescopic cranes

State of the art:

In order to perform an up and down movement of luffing jibs on telescopic and lattice boom cranes, 1 or 2 so-called luffing supports, following WS, are commonly required, which are mounted horizontally with an auxiliary crane lying on each other during the assembly process between main boom and luffing jib. The WS are then connected to each other either by hoist or rods. The WS below during assembly is then connected by means of bracing rods or ropes, while the WS, which is initially above, has to be connected to the main boom by means of rods or ropes. To accomplish the latter, the WS is usually erected either with an assembly crane or by crane hoist rope from the horizontal to the vertical, or pulled When erecting with krangigenem hoist rope ( 1 ) occur here due to the unfavorable angle when pulling enormous forces.

Weak point:

Since an auxiliary crane is uneconomical, WS are commonly erected by hoist rope. The forces that initially occur when pulling from the horizontal forces are reduced by relatively complex lever designs or auxiliary block and other roles. Said constructions are associated with considerable costs especially for large cranes and provide an assembly effort there.

Problem solving and

The forces occurring when pulling a WS with a hoist rope out and into the horizontal, are by bottom, limited opening of the WS ( 2 ), for example, in half, significantly reduced by the lower weight. By means of lifting and mounting part, the WS is folded up to a limited extent, until a favorable, force-reducing lever is created. The limitation of the Aufklappwinkels example. By ropes, pipes or block of WS ( 3 ), is here an integral part of the invention, as well as the fixation of the WS by retaining ropes ( 4 ) for the purpose of closing and opening. When a favorable draft angle is reached, the WS is bolted. ( 5 ) If the WS is in assembly position, the bracing can be done. ( 6 )

Advantages:

Due to the opening limitation of the WS when raising and placing in the horizontal and thus less required effort, no structural changes or attachments to force reduction are necessary. This means a considerable cost saving and reduced, as well as simplifies, time-consuming hazardous mounting activities.

Core of the patent application:

Patenting the erection and depositing process of a rocking support by opening the rocker supports with limitation of the opening angle.

Claims (1)

Main claim Procedure for limited opening and closing of rocker supports to reduce the forces occurring when setting up or dropping from or into the horizontal same rocker by crane own hoist, characterized by : • By suitable provisions limited to open rocker, which opened to optimize the pull angle, in the pulling direction • Elimination of additional, complex temporary erecting aids such as guy jibs, auxiliary cranes or other mechanical and hydraulic constructions • Significant safety gain by reducing the forces in the horizontal area caused by the unfavorable draft angle with rigid rocker supports

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