Trolley

Trolley with driver's cab on a crane in the port facilities of Nordenham

Boom with trolley

Trolley on a double T-beam

Trolley of a tower crane

A trolley , sometimes also called a crane trolley , is a movable crane component in numerous crane designs for changing the position of the hoist rope (on the load-bearing side). Depending on the design, the trolley carries one or more pulleys for the hoist rope or directly for the hoist . Trolleys can be moved along a carrier. The carrier is designed to be stationary or movable. They probably got their name from cats ' ability to balance on high walls or girders and move about quickly and safely.

Depending on the type of crane, the position of the trolley is changed by its own drive or externally, for example by a cable pull . As a rule, they are designed as unmanned vehicles, but they can also be provided with an attached driver's cab for the operating personnel, especially in the case of harbor cranes, where the loading and unloading activities over ships must be monitored.

Trolleys on cranes are available in different application types depending on the carrier:

Monorail

The trolley moves on the lower flanges of a single girder crane and must therefore be adapted to the flange width . A hook path as high as possible can be achieved with the short construction height of monorail trolleys such as the DMR rope hoist, in which the trolley is almost completely to the left and right of the crane girder. In the case of lower flange trolleys, however, the trolley hangs under the crane girder.

Double rail trolley

The trolley hangs between the lower flanges of the two girders of a double girder crane and must therefore be adapted to the track width - the distance between the lower flanges of both girders.

Smaller trolleys (or push trolleys) to five tons are often as a carrying agent for chain hoists (eg Electric used). Here the trolley is moved by pulling on the load or the hook of the chain hoist and the trolley automatically rolls along on the carrier. There are also reel trolleys that are moved on the carrier via an operating chain and a reel trolley.

Today, trolleys are sometimes built according to the modular principle .

literature

• Heinrich Martin, Peter Römisch and Andreas Weidlich: Material flow technology. 9th edition, Vieweg-Teubner-Verlag, 2007, ISBN 3-8348-0313-8 .

Web links

Commons : Overhead cranes  - collection of images, videos and audio files

Wiktionary: Trolley  - explanations of meanings, word origins, synonyms, translations

• Loading and transport equipment for coal, ores and coke. In: Polytechnisches Journal . 318, 1903, pp. 130-138.

Individual evidence

1. ^ Heinrich Martin: Conveyor and storage technology. Springer Fachmedien Wiesbaden 1978, ISBN 3-528-04066-1 , p. 105.