Apparatus and a method for reclaiming foundry sand

Patent metadata

Field	Value
Publication number	US-10035181-B2
Application number	US-201314384312-A
Country	US
Kind code	B2
Filing date	Apr 12, 2013
Priority date	Jun 20, 2012
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

To provide an apparatus for reclaiming foundry sand and a method for reclaiming foundry sand that can effectively remove binders and so on that attach to returned foundry sand that has been used. Foundry sand that has been used is supplied from a chute for feeding sand 14 A to a rotor 16 . The rotor 16 is rotated by a driver 20 so that frictional force is generated on the sand in the rotor 16 . Then, the sand in the rotor 16 is dropped into the container for washing with water 30 that is located below the rotor 16 . In the container for washing with water 30 , an agitator 34 is rotated by the driver 20 so that the sand in the container for washing with water 30 is agitated and washed with water.

First claim

The invention claimed is:

1. 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 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.

2. 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.

3. The apparatus for reclaiming foundry sand of claim 2 , wherein the container for washing with water is equipped with a vertically-moving machine that moves the container for washing with water up and down.

4. 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.

5. 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.

6. 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.

7. The apparatus for reclaiming foundry sand of claim 6 , wherein the container for washing with water is equipped with a vertically-moving machine that moves the container for washing with water up and down.

Assignees

• Sintokogio Ltd

Inventors

• Kato Yusuke
• Zenpo Toshihiko
• Aoki Tomohiro
• Matsumoto Takehiko
• Maegawa Takumi
• Watanabe Hirotsune
• Suda Tomokazu
• Mitsutake Masaomi
• Nakane Hisao

Classifications

• B22C5/0454

  with bottom disc rotating about a vertical axis or with receptacle rotating about a vertical or steeply inclined axis, e.g. with fixed or driven tools, such as rolls · CPC title

• B22C5/02

  Dressing by centrifuging essentially or additionally · CPC title

• B08B3/045

  using perforated containers, e.g. baskets, or racks immersed and agitated in a liquid bath (using perforated drums B08B3/06) · CPC title

• B22C5/0413

  Horizontal mixing and conveying units, e.g. the unit being rotatable about a vertical axis, or having a supplementary mixing house with a vertical axis at its end · CPC title

• B22C5/185 Primary

  comprising a wet reclamation step · CPC title