Sankyo Dengyo Co. Ltd.

Hiroshi Tomiyasu

Hiroaki Tanaka

Yoshio Itoh

Masahiro Hattori

Method and apparatus for automatically controlling a grinding mill in a mill arrangement which includes a grinding mill, raw material feed apparatus and a controller wherein one or more signals indicative of the condition of the mill are input to the controller and compared therein to a set point to generate an output signal based on the comparison and wherein the output signal is input to the raw material feed apparatus to adjust the rate at which raw material is fed into the grinding mill include an arrangement wherein the output signal of the controller is integrated for a predetermined time to obtain a first integrated quantity, the controller set point is then automatically varied a predetermined amount in a predetermined direction such that a second controller output signal is generated, the second controller output signal is then integrated for the predetermined time to obtain a second integrated quantity, the first and second integrated quantities are then compared, and the controller set point is then automatically varied a predetermined amount in a direction determined by the comparison of the first and second integrated quantities such that a third controller output signal is generated. The third controller output signal is integrated for the predetermined time to obtain a third integrated quantity, and then after redesignating the second and third integrated quantities as the first and second integrated quantities, repeating the above steps.

Method and apparatus for controlling a grinding mill

An impact flow meter for measuring a horizontal impact force produced by falling material has a frame and a sensing plate having a front surface and a spaced opposite back surface. A hanging device hangs the plate vertically on the frame thereby preventing material from adhering to the plate. A flow guide is mounted in the frame in front of the front surface of the plate at an inclination with the vertical for directing the falling material to the front surface of the plate whereby the plate is struck by the material. An impact force detector couples the back surface of the plate to the frame for measuring the horizontal impact force of the material.

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Yokohamashi, Japan

Hiroshi Tomiyasu