Abstract: An apparatus for weighing the mass flow of fluent material, especially of particulate type. The apparatus includes a rectilinear and inclined measuring plate on which the material is sliding. The measuring plate is fastened at a central portion of the plate. The fastening device includes one moment measuring unit configured to measure the moment around a horizontal axis crossing the vertical axis. The moment measuring unit is attached to a force measuring unit configured to measure the force directed in or parallel to the vertical axis. The force measuring unit is coupled for support to physical ground, and the material flow is determined by a calculating unit from the output signals from the moment measuring unit and the force measuring unit by determining the forces exerted on the measuring plate and substantially in the direction of the flow.

Abstract: The invention relates to an apparatus for weighing the mass flow of fluent material, especially of particulate type, by determining the forces exerted on a substantially in the direction of the flow rectilinear and inclined plate (3) on which the material (1) is sliding. The measuring plate (3) is fastened at one central level (8 -8) of the plate, and the fastening device includes one moment measuring means (6) measuring the moment round a horizontal axis (7) which is crossing the vertical axis (8 - 8). The moment measuring means (6) is attached to a force measuring means (9) measuring the force directed in or parallel to the vertical axis (8 - 8). The force measuring means (9) is resting on or attached to the ground (10), and the material flow (1) is determined by a calculating means from the output signals from the moment measuring means (6) and the force/load measuring means (9).

Abstract: The invention relates to an impeller being rotated around an axis for a mass flow measuring device receiving inflow of material through an inlet tube. To improve the measurement accuracy, the fan character of the impeller is reduced. This is obtained by two design principles which can be combined. The impeller includes a number of mainly radially directed vanes. That side of each vane along which the measured material flows is formed as a duct with a cross-sectional area which decreases in the direction from the center of the impeller. The other principle is to reduce the airflow by use of an upside down bowl shaped cowling placed over the impeller.

Abstract: A method for zero setting of a measuring device in which particles to be measured are subjected to tangential acceleration in a whirling impeller and torque exerted on the vanes of the impeller in reaction to the Coriolis force of acceleration of the particles is being measured as an indication of mass flow rate. The flow of material is fed to a central part of the impeller and by centrifugal force is thrown outwardly of the impeller. The flow is measured by an electronic device including a microcomputer. When the flow is absent, such condition being continually sensed for, the mean value of the torque during a chosen time or a number of revolutions of the impeller is automatically determined and memorized. This memorized torque value is used as a tare value until a next time a new tare value can be memorized.

Abstract: The invention relates to an impeller torque measuring device for a measuring device in which the mass flow rate, in particular of a bulk material or a fluid, is measured by using the Coriolis measuring principle, comprising an impeller (1) mounted for rotation on a vertical shaft (2) driven by a motor (3), the impeller (1) mounted on one end of the shaft (2) and the motor (3) on the other end of the shaft (2), and wherein the mass flow is charged into the central area of the rotating impeller (1) on which the mass is radially directed to leave the rotating impeller (1) over its circumferential edge, and wherein the torque necessary for rotating the impeller is measured by a torque measuring device (4). The shaft (2) and the motor (3) are connected to a stand (14, 15, 16) supporting the impeller torque measuring device by means of the torque measuring device (4) measuring the torque exerted by the motor (3).

Abstract: The present invention relates to an apparatus for measuring a mass flow of a fluent material using the Coriolis measuring principle. The apparatus comprises an inlet tube positioned and configured to allow the fluent material to flow therethrough and into the apparatus. An impeller wheel rotates about a rotational axis. A motor is operatively connected to the impeller wheel and rotates the impeller about the rotational axis thereof. The impeller wheel is positioned with respect to the inlet tube such that the fluent material flowing through the inlet tube into the apparatus flows into a central area of the impeller. The impeller has vanes that redirect the fluent material flowing from the inlet tube into the central area of the impeller in a generally radial direction away from the central area as the impeller is being rotated by the motor.

Abstract: The invention relates to an impeller (1) for a mass flow measuring device receiving inflow of material through an inlet tube (6), the impeller comprising a bottom plate (4), an upper plate (5) and vanes (3) extending between the lower and upper plates. An inner edge (7) of the vanes (3) is continuously or successively rising from the center (9) of the impeller (1), or the vicinity thereof, towards the outer edge (R.sub.1m) of the inlet tube (6), and that the vanes (3) are provided with a continuously or successively rising outer edge (14) corresponding to an increase of the radius of the impeller from the radius (R.sub.2) of the bottom plate (4) to the radius (R.sub.xm) of the upper plate (5).

Abstract: A method for providing an automatic calibration check of a measuring device in which particles to be measured are subjected to tangential acceleration in a whirling impeller, and torque exerted on the vanes of the impeller in reaction to the Coriolis force of accelerated particles is measured as an indication of a mass flow rate, and wherein the flow of material is fed to the central part of the impeller and thereafter is by centrifugal force thrown towards the circumference of the impeller. Flow is measured by an electronic device which includes a microcomputer. When the flow is absent or constant the rotational speed of the impeller is varied, the moment change thereof is measured and an integrated value of the kinetic energy is used to verify the operation of the instrument.

Abstract: A metering belt feeder for gravimetrically measuring a flow of material with the aid of an endless belt which includes a loading zone (10), a weighing zone (10) and a belt drive which is located between these two zones. The belt is caused to move in a plane above both the loading zone and the weighing zone. The belt drive means is constructed so as to draw the belt from the loading zone in the absence of belt-slipping and to project the belt over the weighing zone, and also so as to guide the belt against sideways movement.

Abstract: An apparatus for electromechanical measurement of forces for weighing is provided. There is a mechanism for measuring the load, which has two parallel end planes. In contact with each end plane is a respective load transmitting unit having two curved surface portions one on each side of a plane parallel to the end planes. The transmitting units both have a longitudinal axis parallel to the end planes and perpendicular to each other. All points on each curved surface portion are the same distance R away from an axis parallel to the end planes, R being greater than half the height of the transmitting unit in a direction perpendicular to its longitudinal axis. Movement of the measuring mechanism is restricted in a direction parallel to its longitudinal axis which is perpendicular to the end planes. One curved portion of each transmitting unit contacts an end plane of the measuring mechanism, and the other curved portion of each transmitting unit contacts the opposing end plane.

Abstract: Weighing device for belt conveyors with individually adjustable reels for universal adaptation to different conveyors.The device is characterized in that the weighing device reels are located in enclosing frames (8,9 and 10,11,12), that the frames of the lateral reels at the inner ends are attached (15) to the frame of the central reel, so that they are adjustable to different troughing angles of the conveyor belts. The angle of rotation is adjusted in that the frames of the lateral reels are extended (17) inward to the center of the weighing device, and at the ends an adjusting screw device (18) is located. The load measuring device consists of parallel springs for carrying and guiding the weighing reel stand, and the load measured is taken up by a load measuring transducer of electromechanical type.

Abstract: A device at an electromechanic platform scale with an inherent stable platform (1-3), the supporting points of the platform against the foundation provided with load measuring means in the form of substantially horizontal beams with load sensing cells (4), each of which transduces part of the load of the platform to an electric signal.It is characteristic of the device that one end of each beam is connected to the platform (1-3) so that the connection (7,8,9) is rigid in vertical direction and elastically resilient in horizontal directions, at least in the direction perpendicularly to the longitudinal axis of the beam, and that the other end of the beam is connected to the foundation (19) of the platform so that the connection (10) is elastically resilient in both vertical and horizontal directions as well as to moments about axes in corresponding planes.

Abstract: A mounting and protective means for use in force measuring or weighing devices comprising a load carrier and a load transmitting means. Its purpose is to facilitate the mounting of the carrier and the transmitting means and to constitute a limiter for lateral displacements in the plane perpendicular to the load action line of the carrier. The mounting and protective means comprises two parts which at measuring are in contact with the transmitting means, one of the parts being also connected to the load carrier and the other part to a foundation for the carrier. The two parts can be brought into at least two positions mutually in the load transmission direction. In one mutual position they are fixed in such position in said plane which the transmitting means is desired to have as initial measuring position. In another, possibly the same, position, this is chosen to enable the transmitting means to be inserted or taken out.