Kilometer long wire rope pretension test machine

Abstract

The invention discloses a pretension testing machine for a kilometers long steel wire rope. The pretension testing machine comprises a pedestal, tensile fixtures and a power device. A fixed tensile fixture is disposed at the left side of the pedestal and a movable tensile fixture is disposed at the right side of the pedestal. A supporting seat is fixed, at the right side of the movable tensile fixture, at the pedestal. The power device is fixed at the right side of the pedestal through evenly arranged jack catches. An output terminal of the right side of the power device is connected to a pressure sensor. The pressure sensor is fixed to a bearing top plate vertically disposed at the right end of the pressure sensor. The two sides of the bearing top plate are connected to the two sides of the movable tensile fixture through symmetrical pull rods. A support is disposed at the bottom of the bearing top plate. The support is provided with sliding grooves and roller chains disposed in the sliding grooves. A plurality of supporting rollers are evenly disposed between the fixed tensile fixture and the movable tensile fixture. 50% of the breaking force of the steel wire rope is applied on the steel wire rope by the pretension testing machine to perform pretension so as to eliminate twisting stress. A phenomenon of not straight tensile caused by sinking due to the self weight is avoided by arranging the supporting rollers.

Description

technical field [0001] The invention relates to a steel wire rope stretching device, in particular to a kilometer-long steel wire rope pretensioning testing machine. Background technique [0002] The looseness of the wire rope means that if the head of the wire rope is in a free state without being tied tightly with a sealing wire, the strands or wires will loosen freely in the opposite direction of twisting. The reason for the looseness is that there are elastic torsional stresses and residual stresses in the strands in the steel wire and inside the steel wire. The torsional stress comes from the helical torsional deformation when twisting the strands and steel wires; the residual stress comes from the cold drawing of the steel wires. The torsional deformation stress of steel wire will reduce its plasticity and strength. For example, the strength of the steel wire in the triangular strand steel wire rope (see special-shaped strand steel wire rope) is reduced by an average...

AI Technical Summary

Problems solved by technology

[0003] Existing twisting stress elimination through deformers is extremely complicated for kilometer-long steel wire ropes. When deformers are used to pre-deform steel wires or strands, slight bending may occur due to multiple bendings. Cracks affect the quality of the wire rope, and the deformation process is more complicated

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