Multipath valve of double valve element crane capable of controlling micro flow precisely

Abstract

The invention relates to a multipath valve of a double valve element crane capable of controlling a micro flow precisely and belongs to the mechanical field. The multipath valve comprises a large drift diameter valve element, wherein a pilot control port Pa, a left side displacement sensor of the large drift diameter valve element, a port Pb and a right side displacement sensor of the large driftdiameter valve element are connected to the left end of the large drift diameter valve element; a port Pb and a right side displacement sensor of the large drift diameter valve element are connected to the right end of the large drift diameter valve element; a small drift diameter valve element is connected in parallel on a working oil path and an oil return path of the large drift diameter valveelement, and oil inlet paths of the large and small valve elements are independent. The small drift diameter valve element is started in a final motion, so that the resolution of the system and the positioning precision of an executing element are improved. The large valve element is started in a high speed large flow, so that a low pressure loss in the high speed large flow can be achieved quickly. The multipath valve is low in energy consumption.

Description

technical field [0001] The invention relates to the technical field of the crane manufacturing industry, in particular to a double-spool crane multi-way valve with precise micro-flow control to facilitate the micro-flow control of the system. Background technique [0002] Truck crane is a kind of engineering machinery widely used in construction sites such as buildings, roads, and mines. It is the most commonly used and main type of engineering cranes. The hydraulic system of the truck crane mainly includes two parts: the upper hydraulic system and the lower hydraulic system. The upper hydraulic system is composed of a slewing system, a lifting system, a luffing system, and a telescopic system. The characteristics of the hydraulic system of the crane are: during fast movement, the system is required to provide large flow and low energy consumption; during fine operation, the system is required to have high flow control accuracy, high resolution and high precision positioning...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the existing multi-way valve for cranes. When the flow rate is small, the opening of the valve port is almost zero, resulting in inaccurate control of the small flow rate, and to provide a double-spool crane multi-way valve with precise control of the small flow rate.

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