| 摘要 |
A self-indicating tensioning device (12) for adjusting the contacting force of a scraper blade (17) against the surface of an endless conveyor belt (10) is disclosed. The self-indicating tensioning device (12) includes a flat spring (30) coupled at one end to a rotatable shaft (24), which supports the scraper blade (17), and coupled at the other end of an adjusting mechanism (16). The adjusting mechanism is operable to exert a force on the flat spring (30) which in turn applies a torque to the rotatable shaft (24) for displacing the scraper blade (17). An indicator rod (32) has one end fixed to the rotatable shaft (24) for displacing the scraper blade (17), and the other end is free. A graduated indicator plate (36) is attached to the movable end of the flat spring (30). When the flat spring (30) is deflected in response to the application of force thereto, the displacement of the graduated indicator plate (36) relative to the free end of the indicator rod (32) provides an indication of the amount of force exerted on the flat spring (30), the amount of torque applied to the rotatable shaft (24), or the amount of force with which the scraper blade (17) contacts the conveyor belt (10).
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