System and method for protecting rotating shaft of crane driving mechanism

Abstract

The invention relates to the field of hoisting machinery, and discloses a system and a method for protecting a rotating shaft of a crane driving mechanism. The system and the method for protecting the rotating shaft are different from a detection technology in the prior art that a motor and a winding drum need to be respectively provided with a position encoder, only a displacement measuring device needs to be installed on the winding drum, the rotation speed information of the motor is acquired from a servo drive of a servo motor, the rotation speed information of the motor is converted to the rotation speed of the rotating shaft of the winding drum, a theoretical traveling distance of the rotating shaft of the winding drum is obtained by integrating the rotation speed of the rotating shaft of the winding drum within a fixed period of time, the theoretical traveling distance is compared with the real traveling distance recorded by the displacement measuring device, when the difference between the theoretical traveling distance and the real traveling distance exceeds a preset warning value, a shaft broken accident can be determined, and a brake device is controlled to brake. The system and the method for protecting the rotating shaft of the crane driving mechanism have the advantages of low cost, high reliability and high detection accuracy and are applicable to a nuclear-grade device associated to the nuclear security.

Description

technical field [0001] The invention relates to the field of hoisting machinery, in particular to a system and method for protecting a rotating shaft of a driving mechanism of a crane. Background technique [0002] The nuclear fuel loading, unloading and storage system is responsible for the lifting and transfer of nuclear fuel assemblies during the overhaul of the nuclear power plant. The crane is an indispensable operating equipment. In terms of safety protection of the crane, it is necessary to have the shaft breaking accident protection of the driving mechanism to prevent shaft breaking accidents. Shaft accidents mainly refer to serious accidents in which the shaft is suddenly broken or the rotor flies away due to crack expansion or overload plastic instability in the weak link of the rotor running at high speed. Once a broken shaft accident occurs, it will directly affect nuclear safety. Detection technology plays a very important role in preventing nuclear fuel acc...

AI Technical Summary

Problems solved by technology

[0004] 1. The cost is high. In the prior art, two sets of encoders are required to be installed at the high-speed end and the low-speed end of the drive mechanism respectively;

[0005] 2. Poor reliability, because the motor speed is very high, the high-speed end encoder has a high probability of damage;

[0006] 3. The accuracy is low, because it is compared to the speed, it is greatly affected by the instantaneous state, and sometimes there will be misjudgment

[0007] The broken shaft protection system in the prior art has many shortcomings, especially it cannot be applied to nuclear related equipment that is directly related to nuclear safety and has strict requirements on the safety level. Therefore, it is necessary to develop a more advanced broken shaft detection technology

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