Linkage double hoisting mechanisms of tower crane and speed regulating method

Abstract

The invention discloses linkage double-hoisting mechanisms of a tower crane and a speed regulating method. The tower crane is provided with the two hoisting mechanisms, wherein one hoisting mechanism comprises a single-speed electric motor, a speed reducer I and a winding drum I, the other hoisting mechanism comprises a double-speed electric motor, a speed reducer II and a winding drum II, the winding drum I and the winding drum II are respectively wound with a plurality of steel wire ropes, the steel wire ropes wind around steering pulleys, load-trolleys and lifting hooks of arm ends of the hoisting mechanisms respectively, and the single-speed electric motor, the double-speed electric motor and a controller are connected. The two hoisting mechanisms are used, the steel wire ropes string the two winding drums, the lifting hooks and the load-trolleys of the tower crane, more steel wire ropes can be contained, and requirements of the tower crane for the lengths of the steel wire ropes are met. The hoisting mechanisms at two different steel wire rope linear speeds are adopted, and speed regulation can be easily achieved through combination of the speeds.

Description

technical field [0001] The invention relates to a linkage double-hoisting mechanism and a speed regulating method of a tower crane. Background technique [0002] Generally, tower cranes use one hoisting mechanism, and some use two hoisting mechanisms to drive the main hook and the auxiliary hook separately, which are independent of each other; [0003] Sometimes the construction project is relatively high, and a hoisting mechanism is limited by the size of the drum, and the capacity of the steel wire rope is limited, which cannot reach the height required by the project; in other cases, it is limited by the capacity of the steel wire rope. After the height, only four ropes can be used instead of two ropes, so that the maximum lifting capacity required by the design cannot be reached; [0004] One of the lifting characteristics of tower cranes is heavy load and low speed, high speed and light load, and there is a minimum speed requirement for accurate placement of heavy obje...

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Problems solved by technology

[0003] Sometimes the construction project is relatively high, and a hoisting mechanism is limited by the size of the drum, and the capacity of the steel wire rope is limited, which cannot reach the height required by the project; in other cases, it is limited by the capacity of the steel wire rope. After the height, only four ropes can be used instead of two ropes, so that the maximum lifting capacity required by the design cannot be reached;

[0004] One of the lifting characteristics of tower cranes is heavy load and low speed, high speed and light load, and there is a minimum speed requirement for accurate placement of heavy objects. Therefore, multi-speed motors and DC motors are used in engineering to obtain various lifting speeds. , Winding motor speed regulation and frequency conversion and other methods, some of which are not effective and have a large impact, and some of which are more costly

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