Chain Wear Indicator 1

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This mechanism includes a main Sprocket Wheel (blue), a Sprocket Wheel (yellow), two pulleys, and a synchronous belt. A spring on the shaft's end, along with internal and external helical gears, maintains constant tension in the chains between the Sprocket wheels and synchronous belt. The yellow pulley is connected to the shaft, while the red pulley rotates around it. The internal helical gear and wear indicator can also move axially on the shaft. If chain wear causes an increase in length, the yellow sprocket and green shaft wheel will rotate inside the red pulley, resulting in the internal helical gear and wear indicator's movement along the shaft. This movement indicates the amount of chain wear and triggers a limit switch. When the chain wears too much, the switch activates an alarm. By periodically measuring the indicator's position changes, one can determine the wear rate over time and estimate chain replacement timing. The system adheres to ISO 7592 standards and empirical experiences, with the indicator and pin calibrated accordingly. During setup, a sprocket wheel must have a chain guide and hold-down installed for proper placement based on drawings. The synchronous belt should be inextensible due to internal fibers and pre-loaded installation (possibly requiring a Belt tensioner). Additionally, this design allows for both visual and electrical limit switches, increases chain-sheave engagement while reducing shock load and wear, and uses only mechanical elements. A linear encoder could also be added to the indicator for continuous wear monitoring during usage.