Apparatus and a method for reclaiming foundry sand

An apparatus for reclaiming foundry sand comprising:

• a container for treatment to which foundry sand that has been used is supplied;
• a mechanism for generating frictional force that has a driver that rotates the container for treatment about a vertical axis, the mechanism generating frictional force on sand in the container for the treatment by rotating the container;
• a container for washing with water that is located below the container for treatment and that can have water supplied to and drained from the container for washing with water, which container for washing with water can receive sand that has been discharged from the container for treatment;
• and
• an agitator that has a shaft for agitation that is connected to the driver to be rotated about a vertical axis, and blades for agitation that are attached to the shaft for agitation and located within the container for washing with water;
• an internally-located and horizontal board that is placed in the container for washing with water and connected to a lower end of the shaft for agitation via a bearing;
• and
• a section made of netting that connects the entire periphery of the internally-located board with the upper opening of the container for washing with water.

An apparatus for reclaiming foundry sand comprising:

• a container for treatment to which foundry sand that has been used is supplied;
• a mechanism for generating frictional force that has a driver that rotates the container for treatment about a vertical axis, the mechanism generating frictional force on sand in the container for the treatment by rotating container;
• a container for washing with water that is located below the container for treatment and that can have water supplied to and drained from the container for washing with water, which container for washing with water can receive sand that has been discharged from the container for treatment;
• and
• an agitator that has a shaft for agitation that is connected to the driver to be rotated about a vertical axis, and blades for agitation that are attached to the shaft for agitation and located within the container for washing with water;
• wherein an axis of rotation of the container for treatment is coaxial with the shaft for agitation,
• wherein the container for treatment is cylindrical rotor with a horizontal bottom, and
• wherein the mechanism for generating the frictional force has a ring that is adjacent to, and outside of, the upper end of the rotor, the ring having a plurality of blades that are circularly arranged and, in a planar view, incline opposite the direction of the rotation of the rotor in the inner radial direction.

An apparatus for reclaiming foundry sand comprising:

• a container for treatment to which founder sand that has been used is supplied;
• a mechanism for generating frictional force that has a driver that rotates the container for treatment about a vertical axis, the mechanism generating frictional force on sand in the container for the treatment by rotating the containers;
• a container for washing with water that is located below the container for treatment and that can have water supplied to and drained from the container for washing with water, which container for washing with water can receive sand that has been discharged from the container for treatment;
• and
• an agitator that has a shaft for agitation that is connected to the driver to be rotated about a vertical axis, and blades for agitation that are attached to the shaft for agitation and located within the container for washing with water;
• wherein an axis of rotation of the container for treatment is coaxial with the shaft for agitation,
• the apparatus for reclaiming foundry sand
• further comprising:
• an internally-located and horizontal board that is placed in the container for washing with water and connected to a lower end of the shaft for agitation via a bearing;
• and
• a section made of netting that connects the entire periphery of the internally-located board with the upper opening of the container for washing with water.

An apparatus for reclaiming foundry sand comprising:

• a container for treatment to which foundry sand that has been used is supplied;
• a mechanism for generating frictional force that has a driver that rotates the container for treatment about a vertical axis, the mechanism generating frictional force on sand in the container for the treatment by rotating the container;
• a container for washing with water that is located below the container for treatment and that can have water supplied to and drained from the container for washing with water, which container for washing with water can receive sand that has been discharged from the container for treatment;
• and
• an agitator that has a shaft for agitation that is connected to the driver to be rotated about a vertical axis, and blades for agitation that are attached to the shaft for agitation and located within the container for washing with water;
• wherein the container for treatment is a drum that has a circular and horizontal bottom, an inclined side wall that inclines so as to have its diameter increase upwardly from the periphery of the bottom, and a weir that extends inwardly from the upper end of the inclined side wall, and
• wherein the mechanism for generating the frictional force has rollers that rotate in the drum, which rollers are disposed to face each other such that gaps between parts of the outer faces of the rollers and the inclined side wall are formed, and a mechanism for pressing the rollers that is disposed at bearings of the rollers to press the rollers toward the inclined side wall,
• the apparatus for reclaiming foundry sand further comprising:
• an internally-located and horizontal board that is placed in the container for washing with water and connected to a lower end of the shaft for agitation via a bearing;
• and
• a section made of netting that connects the entire periphery of the internally-located board with the upper opening of the container for washing with water.