Control method and controller of vertical crusher

Abstract

When material supply amount to a vertical crusher (1) is reduced, the number of revolutions of a rotary table (2) is decreased before the material supply amount is varied actually. In other words, when the vertical crusher (1) is stopped, the number of revolutions of a motor (2M) for driving the rotary table (2) is decreased from the rated number of revolutions by inverter control upon receiving a signal for varying the supply amount from a boiler master at the controller (50A) in a control panel (50) before supply amount of new material into the vertical crusher (1) is varied, thus decreasing the number of revolutions of the rotary table (2). Thereafter, material supply is varied actually upon elapsing a predetermined time. Since the vertical crusher (1) can be stopped while the work load thereof is suppressed and the thickness of a material layer on the rotary table (2) is kept at a predetermined height, abnormal vibration can be prevented effectively during a stop operation and generation of noise can be suppressed.

Description

technical field [0001] The present invention relates to a control method and a controller for a vertical mill mainly used for grinding materials such as coal, oil coke, limestone, slag, slag, ceramic materials and chemicals, and More particularly, it relates to a control method and a controller for a vertical grinder adapted to prevent or suppress abnormal vibrations that are easily caused when grinding materials in the vertical grinder. Background technique [0002] Conventional grinders used to grind coal, oil coke, etc. include widely used grinders such as what is called a vertical grinder (also called a vertical grinder or a vertical drum grinder). [0003] In recent years, vertical grinders have been increasingly used especially for pulverizing materials, and types of vertical grinders including a sorting mechanism inside the vertical grinder have increased. A vertical grinder including such a sorting mechanism is known in the prior art, as disclosed in Patent Document...

AI Technical Summary

Problems solved by technology

In practice, however, even if the material is still somewhat remaining on the rotary table, in many cases, after a certain time has been counted, the motor is stopped, thereby stopping the operation

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