Rope pretensioning device, pretensioning system and tower crane

Abstract

The invention relates to the field of lifting equipment, and discloses a rope pretensioning device, a pretensioning system and a tower crane. The rope pretensioning device comprises a fixing plate anda plurality of rollers arranged on the fixing plate, the multiple rollers comprise the first-row rollers and the second-row rollers, the rollers in the first-row rollers and the second-row rollers are arranged in stagger so that a rope to be pre-tensioned can extend in a channel formed between the first-row rollers and the second-row rollers and can be in the bending state when being tensioned, and the fixing plate is further provided with a connection portion capable of being detachably connected to an installing structure at any position of an advancing route of the rope to be pre-tensioned. The rope pretensioning device and the pretensioning system can provide pre-tightening force quantitatively, continuously and stably, so that the rope is tightly wound on a reel, the rope is prevented from generating additional torque, the service life of the rope is prolonged, carrying movement and on-site assembly are facilitated, the structure is simple, and cost is low.

Description

technical field [0001] The invention relates to the field of hoisting equipment, in particular to a rope body pretensioning device, a pretensioning system and a tower crane. Background technique [0002] For cranes with large lifting heights and changing lifting heights (such as tower cranes), multi-layer steel wire ropes are generally wound on the drum. When the height is low, the lower layer of steel wire ropes cannot be released from the drum. When the load is heavy, the upper layer steel wire rope is easy to sink into the lower layer steel wire rope, resulting in disordered rope arrangement, early scrapping of the steel wire rope, high use cost, and even affecting the normal use of the equipment. In order to ensure the orderliness of the rope arrangement and prolong the life of the wire rope, it is necessary to apply a pre-tightening force to the lower layer of the wire rope. For new equipment, before leaving the factory, the required pre-tightening force can be applied...

AI Technical Summary

Problems solved by technology

[0004] 1. When winding the rope, apply pressure to the rope drum (used to store the wire rope) by manpower to increase the friction torque, so that the wire rope generates a pre-tightening force and winds into the drum. to make the steel wire rope tensioned), it cannot be used for the steel wire rope that has been installed, and because it is a human operation, the magnitude of the added force is greatly affected by the human factors of the operation, and it cannot provide quantitative, continuous and stable pre-tightening force

[0005] 2. Adopt the method of "clamping (for example, a steel wire rope passing through the gap between two fixed objects or a fixed rope clamp, etc.)", and apply pre-tightening force through the friction between the steel wire rope and the fixed object or rope clamp; the "clamping" method It is difficult to quantitatively control the pre-tightening force, and as the clamping object wears out, the clamping force decreases, and the friction force decreases accordingly, and the additional torque generated by the friction force tends to accumulate in the sheave system, which easily leads to damage to the wire rope structure and Phenomena such as "twisting" appear, which affects the service life of the wire rope

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