Kamyr Ab

Claes G Lysen

A solids level detecting assembly is particularly useful for detecting the level of paper pulp (or wood chips during the manufacture of pulp) in a vertical vessel. A first hollow shaft is affixed at a portion thereof to a vessel with a first end extending into the vessel. A second shaft, concentric with the first, is disposed within it and connected at a first end thereof to the first end of the hollow shaft, and to a paddle (plate). A sensing device, including a movable core element of high magnetic permeability material, is mounted to a free end of the second shaft. A stationary core element is mounted adjacent the movable element so that a twisting motion of the first shaft as a result of solid particles acting on the plate changes the flux in the core elements. A flux detector (comprising a pair of coils and a voltage detector) detects the changes in magnetic flux in the core elements, and indicates the change on an indicator, which thus illustrates the level of pulp or chips within the vessel.

Chip level indicator with differential transformer

A transucer is encapsulated within a stainless steel housing in a recess opening within one of the grinding surfaces of a pair of opposed grinding surfaces between which material to be ground (e.g., wood chips to produce mechanical paper pulp) is disposed. Pole pieces formed of a material having wear properties corresponding to the wear properties of the grinding surfaces project through the cover of the housing to terminate flush with one of the grinding surfaces. Consequently, energization of the primary winding establishes a magnetic field through the core, pole pieces, across the gap and into the opposed grinding member, the strength of which is proportional to the distance betwen the pole pieces and the opposed grinding surface. The induced voltage from the secondary coil serves as a measure of the gap distance.

Growing community of inventors

Karlstad, Sweden

Claes G Lysen