Special hoop bending machine for manufacturing box girder reinforcing steel bar of high-speed railway

Abstract

The invention relates to a special hoop bending machine for manufacturing a box girder reinforcing steel bar of high-speed railway. The special hoop bending machine comprises a rack, a workbench, a straight section mould, an arc-shaped mould, a vertical shaft, a rotary arm, a pressure roller mechanism and a power system, wherein the straight section mould and the arc-shaped mould define a reinforcing steel bar hoop inside profiling mould on the workbench; the vertical shaft is perpendicularly supported in the rack; one end of the rotary arm is fixed with the vertical shaft and is transversely arranged between the workbench and the rack; the other end of the rotary arm extends out of the workbench; the upper part of a roller shaft is movably connected with the rotary arm which extends out of the workbench; the lower part of the roller shaft is connected with a roller through a bearing; and the outer cylindrical surface of the roller is opposite to an arc-shaped mould surface, and defines a three-sided mould cavity of the threaded steel in the axial section of the vertical shaft along with a working table board. Threaded steel is put in the straight section mould to start a speed reducer, and the rotary arm rotates clockwise and drives the roller wheel to rotatably press the threaded steel, so that the threaded steel is deformed according to the shape of the arc-shaped mould; when the roller gets across the arc-shaped mould and rotates by a set circular-arc angle, the roller forces the threaded steel to bend into a tail-end straight section; and a bending angle is determined by the size of a circular-arc angle that the roller wheel gets across the arc-shaped mould.

Description

technical field [0001] The invention relates to a steel bar bending hoop machine, in particular to a hoop hoop bending machine specially used for making high-speed rail box girder steel bars, and belongs to the technical field of construction machinery design and manufacture. Background technique [0002] With the rapid development of my country's high-speed railway, a 900-ton prefabricated box girder has been widely used in practical high-speed railway projects. In order to ensure driving safety and structural durability, the designers of the project installed more than 60 tons of threaded steel bars and more than 20 kinds of stirrup shapes in the reinforced concrete box girder, one of which was bent 90° at both ends and connected A steel hoop with a straight section and an arc section in the middle requires that the straight sections at both ends bend inward, and the angles between the tangent to the arc are 3° and 9° respectively. This style of steel hoop is used in each ...

AI Technical Summary

Problems solved by technology

The above production method: low work efficiency, high labor intensity, large shape error

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