Abstract: A torque measuring device for determining properties such as viscosity, shearing force or concentration in liquids or suspensions. The device comprises two elastically connected concentric axles in the form of one external hollow axle through which an inner measuring axle extends, and an element responsive to the measured medium located on a distal end of the measuring axle. The axles are individually propelled by electrical motors. The motors are operated such that the axles rotate at generally constant speed and, simultaneously, the phase between the two are controlled irrespective of applied speed and torque. The torque is measured through the degree of load of the motor propelling the inner axle, which is provided as an output signal.
Type:
Grant
Filed:
December 19, 2007
Date of Patent:
May 8, 2012
Assignee:
BTG Pulp & Paper Sensors AB
Inventors:
Niclas Andersson, Joakim Kullander, Peter Lundberg, Peter Adrian
Abstract: The invention relates to a transmitter for consistency measuring of pulp suspensions at first hand, comprising a measuring body (1), shaped such as a blade, suspended in a vibration-producing apparatus. The measuring body (1) shaped such as blade (I?) shows wave-shaped side surfaces (9, 10) in its transverse direction and is vibratable in a frequency of oscillation between 20-80 Hz and with a predetermined amplitude of +/?2-8 mm, that provides a combination of both shearing force measurement and a measurement of the resistance of conveyance of liquid through a fiber netting.
Abstract: The invention relates to a transmitter for consistency measuring of pulp suspensions at first hand, comprising a measuring body (1), shaped such as a blade, suspended in a vibration-producing apparatus. The measuring body (1) shaped such as blade (I?) shows wave-shaped side surfaces (9, 10) in its transverse direction and is vibratable in a frequency of oscillation between 20-80 Hz and with a predetermined amplitude of +/?2-8 mm, that provides a combination of both shearing force measurement and a measurement of the resistance of conveyance of liquid through a fibre netting.
Abstract: Device for a torque or shear transmitter for determining fibre concentration or viscosity in pulp suspensions and which is adapted to measure an angle deviation between two concentric shafts whereby the angle deviation forms a function of the torque applied on the measuring body. The device includes a feedback system for bringing the inner or measuring shaft to a zero position independent of the magnitude of the torque. The system includes an electromagnetic feedback coil, which encircles two pole shoes journalled in bearing points at the end of the outer shaft, at the same time as each pole shoe is connected to the measuring shaft, whereby a current, generated by a transducer and dependent on the angle deviation, is sent to the winding of the coil, where a magnetic field of force is generated.