To provide a treatment apparatus of a grain container composed of a grain container and a mobile support detachably attached to the grain container, in which a shaft cylinder provided on the side of grain container so as to rotatably engage with a rotating spindle provided on a mobile support side is kept so as not to interfere with grain conveying cylinder of a flexible pipe connecting to a grain-conveying outlet part.

Detachable binding of the grain container B to the mobile support A is carried out by detachable engagement of a square cylinder or a square pillar provided on the side of the mobile support A with a square cylinder or a square pillar provided on the side of the grain container B and binding by the engagement is kept in a state integrally binding by preventing rotation of the grain container B against the mobile support A and the binding is carried out between the square cylinder or the square pillar installed at a position deviated at longitudinal one end of the grain container B and the square cylinder or square pillar provided in the mobile support A and a pivotally supporting part constituted of the shaft cylinder and the rotating spindle fitted to the shaft cylinder is integrated into the side of the mobile support A.

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