| 摘要 |
A rotating consistency transmitter (2) and method of measuring the viscosity, consistency, concentration or the rheological properties of a flowing multipurpose material in a pipeline (5) by measuring the torque acting on a rotating shaft (4), which at one end is driven by a motor (15) and at the other end is attached to an impeller (14) directly positioned inside the pipeline (5). The rotating shaft (4) is made up of three concentric shafts which are aligned with each other and attached together so that a single motor (15) may be used to rotate this rotating shaft (4). The rotating shaft (4) consists of an outer drive shaft (19), a middle sensor shaft (23) and an inner reference shaft (27). The sensor shaft (23) is connected at one end to the drive shaft (19) and connected at the opposite end to the inner reference shaft (27). When the material is present in the main pipeline (5) and in contact with the impeller (14), the rotation of the impeller (14) is impeded, thereby producing a torque across the sensor shaft (23). This torque causes a twisting action on the sensor shaft (23) which may be determined by measuring the angular displacement between the drive shaft (19) and the reference shaft (27). The angular displacement is measured by passing a focussed light beam across two optical disks (28, 29), one being attached to one end of the sensor shaft (23) and the other being attached to the end of the reference shaft (27). The amount of light transmitted through the two optical disks (28, 29) is a direct measure of the torque acting on the sensor shaft (23) which, in turn, directly relates to the drag forces acting on the impeller (14).
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