Hydraulic system for controlling tail gate of pavement milling machine

Abstract

The invention provides a hydraulic system for controlling a tail gate of a pavement milling machine. The hydraulic system comprises an overflow valve, an electromagnetic overflow valve, a first two-position four-way electromagnetic reversing valve, a second two-position four-way electromagnetic reversing valve, a first normally-closed two-position two-way electromagnetic reversing ball valve, a second normally-closed two-position two-way electromagnetic reversing ball valve, a three-position four-way electromagnetic reversing valve, a conveying motor of a belt conveyor, a fixed pressure reducing valve and a tail gate lifting oil cylinder. The hydraulic system has the advantages that the technical scheme is adopted, so that the operating quality of the milling machine is improved, the energy consumption is reduced, the performance is reliable, the structure is simple, the cost is cheap, lifting, locking, floating and back pressure functions of the tail gate can be achieved, the whole weight of the tail gate and a conveying device is grounded, pressure oil is fed into a rod cavity of the tail gate lifting oil cylinder to reduce the ground pressing of the tail gate, the ground pressing can be adjusted according to pavement conditions, the construction quality is guaranteed, the energy consumption is effectively reduced, and the operation is convenient.

Description

technical field [0001] The invention belongs to the technical field of engineering machinery, and in particular relates to a hydraulic system for controlling the tailgate of a road milling machine. Background technique [0002] In the existing technology, the road milling machine is a kind of asphalt pavement maintenance construction machine, which is mainly used for the excavation and renovation of asphalt concrete surface courses such as roads, airports, docks, parking lots, etc. , pavement markings and other road surface disease removal, roughening of cement pavement and milling of surface layer staggering and other operations. During the operation of the milling machine, the tailgate presses the road groove to prevent the milling material from being extruded from the gap between the bottom of the tailgate and the road groove, ensuring that the milling material is in the material chamber of the milling machine, and then transported to the truck by a belt conveyor shipped...

AI Technical Summary

Problems solved by technology

When the pressing force of the tailgate on the ground of the milling groove is small, although the forward resistance of the milling machine becomes smaller, the receiving material is not clean, the bottom of the groove is uneven, and the cleaning work increases; when the pressing force of the tailgate on the bottom of the milling groove is large, the milling material The recovery is clean and the bottom of the groove is flat, but it brings extra resistance to the forward movement of the milling machine, consumes a lot of engine power, makes the tires slip during the forward process, increases tire wear, and even causes the tailgate to deform

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