Worm and gear traction system for bridge rotating body, and traction method

Abstract

The invention discloses a worm and gear traction system for a bridge rotating body, and a traction method. The traction system mainly comprises a control system, a power system, a speed reducing device, a worm gear, a worm, an upper swivel plate and a lower swivel plate. The traction method of the traction system comprises the steps of firstly, using the control system to start the power system so as to drive the worm to rotate, enabling the rotation of the worm to be linked with the rotation of the worm gear, driving the upper swivel plate to rotate by means of the rotation of the worm gear, and driving a bridge body to rotate until the rotating body takes place, wherein the rotating speeds of the worm gear and the worm are regulated and controlled by using the control system to adjust the rotating speed of a motor of the power system in a rotating process, so that the speed of the rotating body is regulated and controlled. The worm and gear traction system and the traction method have the advantages that the forward and backward direction traction for a rotating body structure can be realized, so that the demand of traction direction adjustment can be met when a rotation test is carried out and the rotating body is in place; worm drive is rigid drive, so that a traction hysteresis effect can be avoided, and continuous and uniform traction is realized; mechanical transmission traction is adopted, so that the traction system is good in stability.

Description

technical field [0001] The invention relates to the technical field of bridge swivel construction, in particular to a worm gear traction system for a bridge swivel. Background technique [0002] Bridge swivel construction refers to a construction method in which the bridge structure or its main components are poured or assembled at a position other than the design axis, and then put in place by swivel. According to the rotation direction of the bridge structure, it can be divided into vertical rotation construction method, horizontal rotation construction method and the method of combining horizontal rotation and vertical rotation, among which the horizontal rotation method is the most widely used. From the construction of the first Suining Construction Bridge in 1977 to the present, nearly 300 bridges have been built using the swivel construction method across the country, achieving good technical and economic benefits. [0003] The swivel traction mode develops from inter...

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Problems solved by technology

[0004] At present, the swivel traction method mainly has the following problems: First, the layout and debugging process of the traction system is complicated. Once the traction is started, the swivel process is irreversible; especially after over-rotation, it is difficult to turn in place; the second is that the traction system uses steel strands or wire ropes. It drives the turntable to rotate, which is a flexible transmission and has a transmission hysteresis effect. It cannot achieve continuous and uniform traction before the steel strand or wire rope is tensioned; the third is that the hydraulic and manual traction power stability is relatively insufficient, and the traction stability is not good; It is necessary to pour the traction reaction seat at a certain distance outside the turntable, which requires a large working space and is not suitable for narrow environments

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