Super-lift winch control system and crane using the same

Abstract

The invention discloses a super-lift winch control system, comprising a super-lift motor, a first direction control valve and a controller. The first direction control valve controls two oil ports of the super-lift motor to respectively communicate with a system pressure oil line or an oil return line, wherein two parallel branches are arranged between the system pressure oil line and the first direction control valve, the first branch is provided with a switching valve and the second branch is provided whit a first throttle valve; and the controller is configured to respectively output a first instruction signal for controlling the switching valve to be closed, and a second instruction signal for controlling the first direction control valve to switch to a work position where the system pressure oil line and the oil return line respectively communicate with a lifting port and a falling port of the super-lift motor, according to a crane jib stretching signal. Enough reactive torque can be generated while releasing a steel wire rope in a crane jib stretching process, so that stalling phenomenon is avoided effectively. On this basis, the invention further provides a crane using the super-lift winch control system.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a super-lift winch control system and a crane applying the system. Background technique [0002] With the large-scale development of construction projects, cranes are increasingly developing in the direction of large-scale development. Specifically, R&D personnel ensure various performance indicators of cranes by increasing the length of the boom, lifting height and other technical means, such as: lifting tonnage , working height and range, etc. [0003] In general, the boom length of large cranes is longer (greater than 50 meters). At the same time, in order to make the crane have a wider working range and a higher lifting height, the length of the auxiliary boom is also increased. (Generally it can reach 20-70m). However, as the length of the jib increases, the deflection of the main jib in the luffing plane and the slewing plane is too large, which makes the st...

AI Technical Summary

Problems solved by technology

At present, the back pressure setting value is mostly around 2MPa. In actual operation, when the boom is extended to a certain extent, it will lose its effectiveness, which will affect the effectiveness of the super lifting device.

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