A screw conveyor with variable pitch

Abstract

The invention relates to a conveyor for transporting muck, in particular to a screw conveyor with variable pitch, comprising: a screw input end, an outer cylinder, and an inner cylinder; the inner cylinder is cylindrical and fixed on the outer cylinder in sections There are external splines on the cylinder and the outer wall of the inner cylinder to cooperate with the internal splines on the outer cylinder, and then the rotation of the outer cylinder can drive the inner cylinder to rotate together; the invention fixes the spiral blade of the screw conveyor on the shell, and drives the shell during transportation Rotate, and then drive the spiral blades to rotate to achieve the purpose of transportation, so that the support strength has been significantly improved; the inner cylinder of the screw conveyor provided by the present invention is a segmented unit body, and multiple are fixed on the outer cylinder, and the inner cylinder is relative to the outer cylinder. The barrel can move back and forth, so that the pitch of the helical blade will change dynamically with the size of the gravel, so that there is no worry about the gravel that can enter the pipeline and will be stuck.

Description

technical field [0001] The invention relates to a conveyor for transporting muck, in particular to a screw conveyor with variable pitch. Background technique [0002] The device for earth pressure balance shield machine to transport muck is usually a screw conveyor because of its simple structure and closed transportation. However, in some complex formations (rock and soil coexist), when the rock is not sufficiently broken, larger crushed stones will be produced, which will be stuck during the transportation of the screw conveyor. [0003] The existing CN207658574U patent "A shaftless spiral blade of a shield machine" discloses a spiral blade without a central shaft. Without a central shaft, the transportation space will naturally become larger, and larger stones will be more convenient to transport. However, This design still has the following problems and shortcomings: [0004] 1. After the central shaft is removed, the screw blades only rely on the shafts at the entranc...

AI Technical Summary

Problems solved by technology

[0004] 1. After the central shaft is removed, the screw blades only rely on the shafts at the entrance and exit to support the overall transportation. Obviously, the support strength is not enough. During the transportation process, the pressure on the screw blades may cause breakage;

[0005] 2. Although the transportation space of the spiral blade after removing the central shaft becomes larger, there are still some gravels that can enter the pipeline in diameter and are stuck, because the front end of these stuck gravels has entered the pipeline, but because the spiral blade The pitch is too small, so it can't go in completely, and then gets stuck at the inlet, which has the consequence of constantly wearing the blade

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