Double pump confluence type multi-way ratio control valve with load sensitivity information circuit

Abstract

This invention relates to one sensitive pump collective multi-path proportion operation valve with load, which comprises the following parts: pump and its connection mouth; oil tank and its connection mouth and input interface with contract structure proportion valve; variable structure operation valve, reel structure proportion valve, main reel structure operation valve; shunt valve and safety valve; the above valves are set with load sensitive information circuit in between; the pump one and two are set with single and double automatic switch valves and single valve to select single or double pump to supply oil.

Description

technical field [0001] The invention relates to the field of a hydraulic transmission control device. In particular, it relates to a load-sensitive dual-pump confluence type multi-channel proportional control valve widely used in the control technology of the four actuators of telescopic, luffing, main coil and secondary coil on hydraulic truck cranes. The present invention is also applicable to various hydraulic engineering machinery, ship hydraulic cranes, hydraulic winches and engineering ship hydraulic hoisting equipment. Background technique [0002] The existing traditional main control valve is only an on-off reversing switch valve, which can only manipulate one actuator to act. The maneuverability of the hydraulic truck crane is greatly affected, as shown in Figure 12 and Figure 13, the hydraulic schematic diagram of the main control valve in the manual operation mode is installed on the QY50 hydraulic truck crane, and it has the function of double pump confluence, ...

AI Technical Summary

Problems solved by technology

[0002] The existing traditional main control valve is only an on-off reversing switch valve, which can only manipulate one actuator to act. The maneuverability of the hydraulic truck crane is greatly affected, as shown in Figure 12 and Figure 13, the hydraulic schematic diagram of the main control valve in the manual operation mode is installed on the QY50 hydraulic truck crane, and it has the function of double pump confluence, but the biggest disadvantage is The traditional hydraulic control main control valve has external hydraulic control instructions, but it is a directional switch valve, which cannot realize proportional speed regulation. The flow output from A and B ports is greatly affected by load changes, and two or more than two manipulating work while moving

Only one actuator can be manipulated, two or more actuators cannot be manipulated at the same time, and stepless speed regulation is not possible

[0003] Figure 13 is the hydraulic schematic diagram of the main control valve in the external hydraulic control mode. Its disadvantages are the same as those in Figure 12, except that the control mode is different, and the volumetric efficiency of the valve is low, which affects the lifting speed of the main roll.

[0004] At present, the main control valves of foreign cranes and construction machinery have been developed to use electro-hydraulic control valve control and pump control multi-way proportional valves, and can realize remote control outside the machine, while the technology of the above-mentioned main control valves made in my country There is a big gap between the level and foreign countries

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