手すり加速度を用いたエスカレーターチェーンの弛み異常診断 [in Japanese] Fault Detection of Chain Tension in Escalator Using Handrail Acceleration [in Japanese]
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This paper proposes a new method of chain tension fault detection for escalators. This method can detect the loose tension in the chain automatically using an accelerometer attached to the handrail without overhauling the escalator, which is effective for maintenance. First, the transitional pattern of the handrail vibration when starting up the escalator in the reverse direction was studied. The first pattern involves the vibration generated by starting up the upper sprocket, and the second pattern involves the vibration generated by starting up the handrail. When tension of the chain is loose, the time delay between the first pattern and the second pattern, called the "start up delay time", is increased. Therefore, the loose tension of the chain can be detected by the start up delay time. Based on these characteristics, this paper proposes a method of detecting the start up delay time automatically using signal processing techniques. A chain fault detection system was produced, and system tests were conducted to evaluate the performance for several loose tension conditions using real escalators. The test results showed that the start up delay time increased in proportion to the looseness of the chain tension. Therefore, it is possible to detect chain tension faults using the proposed method.
- Transactions of the Society of Instrument and Control Engineers
Transactions of the Society of Instrument and Control Engineers 44(8), 622-628, 2008-08-31
The Society of Instrument and Control Engineers