| 摘要 |
PROBLEM TO BE SOLVED: To provide a safety device by which safety is maintained, the agitating state is visually recognized, the deposition of an auxiliary material is inhibited, the auxiliary material is charged without stopping an agitating shaft, and an agitator is detached or attached when the device is opened. SOLUTION: The front face of a cylindrical virtual curved face extended upward from the peripheral edge 21 of the vessel 20 supported in front of a strut 12 for the mixer is used as an opening and closing region. At this time, a protective fence 30 having the same height as and a larger circumference than the region is provided and circumferentially rotatable, one end of the fence in the circumferential direction is notched from the lower end to the height out of reach for the operator to form a notch, and an agitating shaft 14 is stopped when the circumference of the notch appearing in the region exceeds a set length.
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