Crane hoisting and lowering speed hydraulic control equipment, method, system and crane

Abstract

The invention discloses crane windlass descending speed hydraulic control equipment, a method and a system and a crane. The equipment comprises a receiving device for receiving the load of a lifting hook of the crane and the openness of an electric control handle, and a control device for actuating the following operations: the single-rope load of a windlass is calculated according to the load of the lifting hook; the openness of a main valve of controlling the flow of hydraulic oil to a windlass motor is determined according to the single-rope load and the openness of the electric control handle; and the main valve is controlled to reach the determined openness. The equipment can solve the contradiction between the working efficiency under the working condition of idle or light load of the crane and the safety under the working condition of heavy load, on the one hand, can guarantee the operation speed under the working condition of idle or light load, and on the other hand, guarantees safe and controllable descending speed under the working condition of heavy load.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a hydraulic control device, method, system and crane for hoisting and lowering speed of a crane. Background technique [0002] The working conditions of crane hoisting are very strict, often requiring high working speed and efficiency in no-load and light-load conditions, and at the same time requiring low speed and high safety in heavy-load conditions. The high-speed movement of the crane winch under heavy load conditions can easily cause safety accidents. In order to give priority to meeting the safety requirements, the current hydraulic control of the crane generally adopts the control principle of load sensing hydraulic pressure + balance valve. [0003] figure 1 A structural schematic diagram of an existing hydraulic control system for hoisting and lowering speed of a crane adopting the control principle of load sensing hydraulic pressure and balance valve is shown. Su...

AI Technical Summary

Problems solved by technology

The operator can directly control the valve opening and output flow of the main valve 2 by operating the electric control handle, and then control the rotation speed of the winch motor 4 and the lowering speed of the heavy object. The flow rate of the valve port and the opening of the balance valve are limited, resulting in a lower maximum speed of the hoisting and lowering, resulting in low working efficiency under no-load and light-load conditions

That is to say, in order to give priority to satisfying the requirement of heavy load safety, the hoisting and lowering hydraulic control system of the existing truck crane often sacrifices the efficiency and speed of no-load and light-load work, making the operation preparation time too long, resulting in no-load and light load Low work efficiency under load conditions

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