| 摘要 |
PROBLEM TO BE SOLVED: To heat a conveying bucket with a simple constitution, and to facilitate the maintenance thereof. SOLUTION: A heater 23 is arranged in the circumferential wall of a bucket 9, and the heater 23 is provided with fixed electrodes 25 for receiving the supply of heating power. Further, each of movable electrodes 34 for supplying electric power is horizontally movably arranged to a cylinder 26 via a coil spring 33 so as to face to the surface of the fixed electrode 25 of the bucket 9 in the standby position of the bucket, while the bucket 9 is stopped in its standby position, the cylinder 26 is extended so that the movable electrode 34 is buttingly brought into contact with the fixed electrode 25. At that time, the movable electrode 34 is brought into contact at a proper pressure while absorbing the shock of contact by the coil spring 33. When the respective movable electrodes 34 are brought into the fixed electrodes 25, power is supplied to the heater 33 for heating the bucket 9 up to an appropriate temperature.
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