Step-changing control hydraulic system of vertical shaft heading machine

Abstract

The invention discloses a vertical shaft heading machine step-changing control hydraulic system which comprises a first oil pump, a first reversing valve, a hydraulic control one-way valve and a thrust oil cylinder, the first oil pump is connected with the first reversing valve, the first reversing valve is connected with the hydraulic control one-way valve, and the hydraulic control one-way valve is connected with a rod cavity and a rodless cavity of the thrust oil cylinder. An electromagnetic ball valve and a first proportional overflow valve are connected to an oil way where the hydraulic control one-way valve is connected with a rodless cavity of the thrust oil cylinder, the variable frequency motor provides power for the second oil pump, the second oil pump is connected with the second reversing valve, and the second reversing valve is connected with a rod cavity and a rodless cavity of the lifting oil cylinder. The hydraulic control one-way valve is used for carrying out pressure maintaining on propelling force, the situation that the pressure of the propelling oil cylinder is suddenly released in the step changing state can be avoided, in addition, overflow unloading is carried out through the electromagnetic ball valve and the first proportional overflow valve, it can be guaranteed that the step changing process of a lifting system is stable, and therefore the operation stability and safety of a hydraulic system can be improved.

Description

technical field [0001] The invention relates to the technical field of shaft boring machines, in particular to a step change control hydraulic system of the vertical shaft boring machines. Background technique [0002] Shaft boring machine is a kind of construction machinery equipment specially used for the excavation of underground vertical tunnel engineering. The shaft boring machine includes a propulsion system and a lifting system. Lifting function, the propulsion system provides the propulsion force to push the segment, and when matched with the lowering of the lifting system, vertical excavation can be realized. After the shaft roadheader excavates an effective stroke of the hoisting hydraulic cylinder, it stops the excavation, the propulsion system enters the pressure relief and follow-up state, releases the propulsion force transmitted to the steel strand of the hoisting system, and completes the step change with the hoisting system. The next trip is carried out, bu...

AI Technical Summary

Problems solved by technology

After the shaft boring machine digs an effective stroke of the lifting hydraulic cylinder, the tunneling stops, and the propulsion system enters the pressure relief and follow-up state, releasing the propulsive force transmitted to the steel strand of the hoisting system, and cooperates with the hoisting system to complete the step change. After the step change is completed Carry out the next stroke of excavation, but the existing shaft boring machine is less safe in the step-changing state

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