Load pressure self-adaptive control hydraulic system, control method and pre-grooving machine

Abstract

The invention discloses a load pressure self-adaptive control hydraulic system, a control method and a pre-grooving machine. The load pressure self-adaptive control hydraulic system comprises an oil supply main path and a feedback auxiliary path. The oil supply main path comprises an electromotor, a balance valve set, a shuttle valve, an oil pump control valve, an oil tank, an oil pump, a filter, an electro-hydraulic directional valve and a motor, wherein the oil tank, the oil pump, the filter, the electro-hydraulic directional valve and the motor are connected in sequence. The oil pump control valve is suitable for controlling the oil discharge amount of the oil pump. The feedback auxiliary path comprises a throttling valve and an inverse-proportional relief valve. One end of the throttling valve is communicated with the liquid discharge end of the filter, the other end of the throttling valve is communicated with one end of the inverse-proportional relief valve, and the other end of the inverse-proportional relief valve is communicated with the oil tank. According to the load pressure self-adaptive control hydraulic system, the throttling valve and the inverse-proportional relief valve constitute the feedback auxiliary path, and thus the oil pump can be made to be in a constant pressure state, and the control requirements for torque self-adaption and flow self-following are met; accordingly, the motion stability of equipment can be improved, and the reliability of the equipment is improved.

Description

technical field [0001] The present invention relates to the technical field of engineering machinery, and in particular relates to a load pressure adaptive control hydraulic system, a control method and a pre-grooving machine. Background technique [0002] Taking the tunnel pre-cutting technology as an example, the tunnel pre-cutting technology means that before the excavation (or blasting) of the tunnel working face, the equipment travels to a certain distance from the excavation face, and the central axis on the equipment drives the chain knife on the tunnel section. The outer profile is cut into a narrow groove with a certain thickness and depth. At the same time, the concrete grouting device integrated with the chain knife is used to inject concrete into the closed concrete cavity synchronously. The pressure generated by the closed concrete cavity pushes the chain knife to cut along the tunnel contour. , so that a continuous concrete shell is formed on the outer surface ...

AI Technical Summary

Problems solved by technology

The overflow of high-pressure oil is large, which can easily cause the system to heat up, which requires a strong cooling device and additional system configuration; manual pressure adjustment relies on human judgment, slow response, and it is difficult to achieve accurate and fast operation

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