On-line identification method for broken shaft fault of rocker arm of drum shearer

Abstract

The invention relates to a drum shearer rocker arm broken shaft fault on-line identification method, which comprises the following steps: acquiring real-time three-phase current of a shearer cutting motor and real-time traction speed data of a shearer, carrying out clock synchronization, and obtaining sampling time count synchronized with the three-phase current and the traction speed; the real-time three-phase current effective value and the change rate of the real-time three-phase current effective value of the cutting motor and the change rate of the traction speed are synchronously calculated in real time according to the fixed time step pitch; according to the three-phase current and the change rate of the three-phase current effective value, whether the cutting motor is in a current drop state at the moment is judged; when it is judged that the cutting motor is in the current drop state, judgment is conducted by combining the change rate of the traction speed, and if the non-broken shaft fault which can cause the current drop state is further eliminated, it is judged that the rocker arm broken shaft fault occurs. According to the method, the current and traction speed real-time monitoring conditions of the existing cutting motor can be utilized, and the broken shaft fault can be efficiently and accurately identified under the condition that no hardware device is added.

Description

technical field [0001] The invention relates to a fault diagnosis method for a rocker arm of a shearer, in particular to a method for identifying a broken shaft fault of a rocker arm gearbox of a shearer. Background technique [0002] As the main mechanical equipment for safe and efficient production in modern mines, the reliability of the shearer directly affects the normal operation of the entire coal face, especially in the automatic working face. index. [0003] The rocker arm is the main power transmission component of the shearer when it cuts coal, and the power consumption of the cutting part where it is located accounts for 80%-90% of the power of the entire shearer. According to statistics, in a modern 100 million-ton mining area in recent years, the failure rate of the rocker arm of the shearer cutting part accounted for an average of 34.2% of the failure rate of the shearer, of which the failure of the rocker arm transmission system accounted for more than 80% of...

AI Technical Summary

Problems solved by technology

Some mines carry out online fault monitoring of the rocker gearbox by adding oil quality detection or vibration detection sensing equipment, but the underground working conditions are harsh, and the additional sensor device is installed outside the fuselage, which is difficult to protect and it is difficult to achieve long-term reliability. Work

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