Metal coil compression binding apparatus

1. A metal coil compression device configured to axially compress a metal coil placed with an axis thereof vertical to bind the metal coil with a binding band, the metal coil compression device comprising:

a lifting device configured to generate a vertically downward pressing force;

a cylindrical outer pressure barrel that is supported by the lifting device, the cylindrical outer pressure barrel being configured to move vertically, the cylindrical outer pressure barrel having an opening opened vertically downward on a bottom thereof;

a cylindrical inner pressure barrel that is located inside a peripheral wall of the outer pressure barrel;

a connecting mechanism that is located between the inner pressure barrel and the outer pressure barrel, and connects the inner and outer pressure barrels so that the inner and outer pressure barrels are vertically engaged and are supported relatively rotatably in a circumferential direction,

a placing table on which the metal coil is placed; and

a rotation mechanism configured to rotate the placing table with the inner pressure barrel;

wherein the outer pressure barrel has an outer recess in the peripheral wall of the outer pressure barrel, the outer recess being recessed vertically upward from a bottom end, and

the inner pressure barrel has;

an inner recess in a peripheral wall of the inner pressure barrel, the inner recess being recessed vertically upward from a bottom end; and

a coil pressing surface that is located at the bottom end of the peripheral wall of the inner pressure barrel and makes contact with a top of the metal coil to transmit the vertically downward pressing force to the metal coil.

2. The metal coil compression device according to claim 1 ,

wherein the inner pressure barrel has a plurality of the inner recesses in the circumferential direction.

3. A metal coil compression binding apparatus comprising:

a metal coil compression device configured to axially compress a metal coil placed with an axis thereof vertical to bind the metal coil with a binding band, the metal coil compression device including:

a lifting device configured to generate a vertically downward pressing force;

a cylindrical outer pressure barrel that is supported by the lifting device, the cylindrical outer pressure barrel being configured to move vertically, the cylindrical outer pressure barrel having an opening opened vertically downward on a bottom thereof;

a cylindrical inner pressure barrel that is located inside a peripheral wall of the outer pressure barrel; and

a connecting mechanism that is located between the inner pressure barrel and the outer pressure barrel, and connects the inner and outer pressure barrels so that the inner and outer pressure barrels are vertically engaged and are supported relatively rotatably in a circumferential direction; and

a binding device that binds the metal coil placed with the axis thereof vertical with the binding band,

wherein the outer pressure barrel has an outer recess in the peripheral wall of the outer pressure barrel, the outer recess being recessed vertically upward from a bottom end,

the inner pressure barrel has:

an inner recess in a peripheral wall of the inner pressure barrel, the inner recess being recessed vertically upward from a bottom end; and

a coil pressing surface that is located at the bottom end of the peripheral wall of the inner pressure barrel and makes contact with a top of the metal coil to transmit the vertically downward pressing force to the metal coil, and

the binding device includes a binding band insertion portion configured to insert the binding band into both the outer recess and the inner recess.

4. The metal coil compression binding apparatus according to claim 3 ,

wherein the inner pressure barrel has a plurality of the inner recesses in the circumferential direction.