Magneto-rheological elastomer and piezoelectric hybrid control type shield hobbing cutter

Abstract

The invention provides a magneto-rheological elastomer and piezoelectric hybrid control type shield hobbing cutter. An annular groove is formed in the circumferential surface of a cutter body, a piezoelectric device is arranged in the annular groove, a cutter ring is arranged on the annular groove and is in contact with the piezoelectric device, and a plurality of pressure sensors are arranged inthe cutter ring; end covers are arranged on the two sides of the cutter body in a sealing mode, a cutter shaft extends out from center holes of the end covers on the two sides, a cutter shaft seat sleeves the two ends of the cutter shaft, and the cutter shaft seat is filled with the magneto-rheological elastomer wound an electromagnetic coil; an electricity storage device is correspondingly connected with the piezoelectric device, the electromagnetic coil and a controller, and the pressure sensors are connected with the controller; and the piezoelectric device generates high-frequency currentsafter being pressed, electric energy is stored in an energy storage device, the pressure sensors detect pressure of the cutter ring and transfer the pressure to the controller, when the pressure reaches a threshold value, the energy storage device is controlled to supply electricity to the electromagnetic coil, a variable magnetic field is applied to the magneto-rheological elastomer, then the mechanical property of the magneto-rheological elastomer is adjusted, the rigidity of the position of the cutter shaft is changed, and greater power is provided for cutting tools.

Description

technical field [0001] The invention belongs to the field of cutters for shield machines, and in particular relates to a hybrid control type shield hob of magneto-rheological elastomers and piezoelectricity. Background technique [0002] With the construction of a large number of subway lines in major cities in my country, the strata encountered in the construction of shield tunnels are becoming more and more complex, among which the upper soft and lower hard strata are the most typical. When the shield tunnels in the upper soft and lower hard strata, the uneven hardness of the rock surface will cause the shield machine tool to continuously collide with the protruding rock surface during the rotating cutting, which will not only cause damage to the tool but also affect the direction of the excavation. Deviation occurs, which reduces the tunneling efficiency of the shield machine and even damages the cutterhead. Contents of the invention [0003] The purpose of the present...

AI Technical Summary

Problems solved by technology

When the shield tunnels in the upper soft and lower hard strata, the uneven hardness of the rock surface will cause the shield machine tool to continuously collide with the protruding rock surface during the rotating cutting, which will not only cause damage to the tool but also affect the direction of the excavation. Deviation occurs, which reduces the tunneling efficiency of the shield and even damages the cutter head

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