Automatic hook sealing and unhooking control method for crane

Abstract

The invention relates to an automatic hook sealing and unhooking control method for a crane; the automatic hook sealing and unhooking control method comprises the steps that automatic hook sealing control is conducted, specifically, a PLC control cabinet is controlled to enter a hook sealing control mode, then the PLC control cabinet controls a lifting hook of the crane to vertically fall into a lifting hook box and be fixed, and then the PLC control cabinet controls a variable-amplitude motor to drive a variable-amplitude winch to unwind a rope so that an arm frame of the crane can be lowered. When the variable-amplitude winch releases the rope, the PLC control cabinet controls the locked-rotor alarm function of a lifting frequency converter to be closed, a lifting motor is controlled by the lifting frequency converter to drive the lifting winch to take up the rope at the maximum speed when the jack is in a no-load state, and the torque of the lifting motor is controlled to be maintained within the torque limiting range so as to tighten the steel wire rope. And after a cantilever crane is placed on the cantilever crane rest stand and placed in place, the PLC control cabinet quits the unhooking control mode. According to the design, the steel wire rope or the lifting hook fixing device can be prevented from being damaged due to excessive tightening while tightening of the steel wire rope is guaranteed, and the safety is good.

Description

technical field [0001] The invention belongs to the technical field of cranes, and in particular relates to a crane automatic hook sealing and unhook control method, which is suitable for realizing the automatic hook sealing / unhook control of crane hooks while ensuring the safety of the crane. Background technique [0002] For a large crane installed on a platform or ship, the hook needs to be sealed before the platform or ship sails, otherwise the crane hook is likely to shake due to the shaking of the platform / ship caused by waves during the sailing process, making the hook and the hook Collisions occur between the hook and the wire rope, and in severe cases, the hook / wire rope is damaged. At the same time, after the platform / ship sails to the target position, the sealed hook should be unsealed before the crane starts to work. [0003] The traditional method is to seal and unhook the hook by the crane driver operating the luffing and hook at the same time. At the same tim...

AI Technical Summary

Problems solved by technology

[0003] The traditional method is to seal and unhook the hook by the crane driver operating the luffing and hook at the same time. At the same time, other personnel are required to observe the hook box and the crane pulley to avoid loosening or tightening the wire rope due to improper operation by the driver. Cause safety problems or damage the hook fixing device at the hook box, especially for cranes with multiple hooks, the operation process is particularly cumbersome and time-consuming

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