Oil supply control method, device and system of hoisting mechanism hydraulic system and crane

Abstract

The invention discloses an oil supply control method, device and system of a hoisting mechanism hydraulic system and a crane. The oil supply control method, device and system of the hoisting mechanism hydraulic system and the crane are used for improving the safety of the hoisting and ascending and descending operation of the crane. The method comprises the steps that hoisting suspended load weight of a hydraulic hoisting mechanism is acquired; when the hoisting suspended load weight is larger than a set weight threshold value, the starting and stopping state information of an engine is acquired; flameout duration before the starting of the engine is calculated according to the starting and stopping state information of the engine; the oil supply duration of supplying oil to the hydraulic system is obtained according to the flameout duration and the corresponding relation of the flameout duration and the oil supply duration; a first oil supply control signal is alternately output to a hoisting lifting control valve with the oil supply duration as duration time, and a second oil supply control signal is output to a hoisting descending control valve.

Description

technical field [0001] The invention relates to the technical field of hoisting machinery, in particular to a method, device and system for oil replenishment control of a hydraulic system of a hydraulic winch mechanism and a crane. Background technique [0002] As one of the most important components of a crane, the winch mechanism is of utmost importance to the safety of its operation. The hoist mechanism can be divided into internal combustion engine drive, electric motor drive and hydraulic drive according to the driving mode. Among them, the hydraulic drive mode is the most widely used due to its large transmission ratio, wide-range stepless speed regulation, compact structure, stable operation, and good overload protection performance. [0003] When the hydraulic hoisting mechanism performs hoisting operations, the most complicated working condition is to perform secondary take-off and landing, that is, after the heavy object is suspended in the air and stops for a cert...

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Problems solved by technology

[0005] The inventors of the present application have found that the conventional oil replenishment scheme is mainly for the descending chamber of the hydraulic motor to replenish oil, which cannot realize the oil replenishment of the high-pressure chamber, and still cannot avoid safety problems caused by the leakage of the hoist balance valve; in addition, when the engine After a long time of flameout, in order to ensure the safety of the second take-off and landing of heavy objects, the operator is generally required to start the engine for a period of time before allowing relevant operations. This period of time is usually judged by the operator based on experience or subjective safety awareness. The actual hoisting load and flameout time are not the same, and the time requirements for oil replenishment are also different. Therefore, there are also major safety hazards

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