Mixer and mixing method for gypsum slurry

A mixer for preparation of gypsum slurry, which has a circular housing defining a mixing area for mixing and kneading of the gypsum slurry, a rotary disc positioned in the housing and rotated in a predetermined rotational direction, a rotary driving shaft extending through an upper or lower plate of the housing to be integrally connected with the rotary disc, and a slurry discharge port provided on the housing for feeding the gypsum slurry of the mixing area onto a production line, comprising:

• a scraper which is positioned above said rotary disc in said mixing area formed between the disc and said upper plate, which is spaced apart from an upper surface of the disc, and which is spaced at a small distance from a lower surface of the upper plate for scraping off the slurry from the lower surface of the upper plate;
• and
• an annular basal part which is provided on said rotary disc in a center region of the disc so as to rotate integrally with the disc and which is formed to surround a rotational center axis of said rotary driving shaft,
• wherein an inner end portion of said scraper is fixed to the annular basal part, an outer end portion of the scraper is positioned in a peripheral zone of the disc, and the scraper is bent or curved backward in a rotational direction of the disc between said inner and outer end portions.

A mixer for preparation of gypsum slurry, which has a circular housing defining a mixing area for mixing and kneading of the gypsum slurry, a rotary disc positioned in the housing and rotated in a predetermined rotational direction, a rotary driving shaft integrally connected with the rotary disc, a scraper positioned in the mixing area, and a slurry discharge port provided on the housing for feeding the gypsum slurry of the mixing area onto a production line:

• wherein said rotary driving shaft extends through an upper or lower plate of said housing to be connected with said rotary disc;
• wherein an inner end portion of said scraper is positioned in a center region of said rotary disc, an outer end portion of the scraper is positioned in a peripheral zone of the disc, and said slurry discharge port is positioned on an annular wall of said housing;
• wherein said slurry discharge port is provided with a fluid passage dividing member which divides an opening of the port into a plurality of narrow openings so as to increase fluid resistance on the gypsum slurry flowing out of said mixing area through said opening of the port;
• and
• wherein a pin for augmenting a fluid flow of said slurry flowing out of the mixing area through said slurry discharge port is provided to stand on a periphery of said rotary disc and a distal end portion of said scraper is supported by said pin.

A mixing method for gypsum slurry with use of a mixer for preparation of the gypsum slurry, the mixer having a circular housing defining a mixing area for mixing and kneading of the gypsum slurry, a rotary disc positioned in the housing and rotated in a predetermined rotational direction, a rotary driving shaft extending through an upper or lower plate of the housing to be integrally connected with the rotary disc, and a slurry discharge port provided on the housing for feeding the gypsum slurry of the mixing area onto a production line:

• wherein a scraper is positioned above said rotary disc in said mixing area formed between the disc and said upper plate, and the scraper is spaced apart from an upper surface of the disc and is spaced at a small distance from a lower surface of the upper plate for scraping off the slurry from the lower surface of the upper plate;
• wherein an annular basal part is provided on said rotary disc in a center region of the disc so as to rotate integrally with the disc and is formed to surround a rotational center axis of said rotary driving shaft;
• wherein said scraper is horizontally supported by fixing an inner end portion of the scraper to the annular basal part, an outer end portion of the scraper is positioned in a peripheral zone of said rotary disc, said slurry discharge port is positioned on an annular wall of said housing, and an opening of said slurry discharge port is divided into a plurality of narrow openings so as to increase fluid resistance on the gypsum slurry flowing out of said mixing area through said opening of the port;
• and
• wherein said rotary driving shaft rotates said rotary disc and said scraper about said rotational center axis so that said slurry is mixed and kneaded in said mixing area and the slurry is moved toward the periphery of the mixing area by centrifugal force acting on the slurry, whereby the slurry flows out of said mixing area through said slurry discharge port.

A mixing method for gypsum slurry with use of a mixer for preparation of the gypsum slurry, the mixer having a circular housing defining a mixing area for mixing and kneading of the gypsum slurry, a rotary disc positioned in the housing and rotated in a predetermined rotational direction, a rotary driving shaft extending through an upper or lower plate of the housing to be integrally connected with the rotary disc, a scraper positioned in the mixing area, and a slurry discharge port provided on the housing for feeding the gypsum slurry of the mixing area onto a production line:

• wherein a scraper is positioned above said rotary disc in said mixing area formed between the disc and said upper plate, and the scraper is spaced apart from an upper surface of the disc and is spaced at a small distance from a lower surface of the upper plate for scraping off the slurry from the lower surface of the upper plate;
• wherein an annular basal part is provided on said rotary disc in a center region of the disc so as to rotate integrally with the disc and is formed to surround a rotational center axis of said rotary driving shaft;
• wherein said scraper is horizontally supported by fixing an inner end portion of the scraper to the annular basal part, and the scraper is bent or curved backward in a rotational direction of the disc, between said inner and outer end portions;
• and
• wherein said rotary driving shaft rotates said rotary disc and said scraper about said rotational center axis so that said slurry is mixed and kneaded in said mixing area.

A mixing method for gypsum slurry with use of a mixer for preparation of the gypsum slurry, the mixer having a circular housing defining a mixing area for mixing and kneading of the gypsum slurry, a rotary disc positioned in the housing and rotated in a predetermined rotational direction, a rotary driving shaft integrally connected with the rotary disc, a scraper positioned in the mixing area, and a slurry discharge port provided on the housing for feeding the gypsum slurry of the mixing area onto a production line:

• wherein an inner end portion of said scraper is positioned in a center region of said rotary disc, an outer end portion of the scraper is positioned in a peripheral zone of the disc, said slurry discharge port is positioned on an annular wall of said housing, and an opening of said slurry discharge port is divided into a plurality of narrow openings so as to increase fluid resistance on the gypsum slurry flowing out of said mixing area through said opening of the port;
• wherein said rotary driving shaft extends through an upper or lower plate of said housing, and the shaft rotates said rotary disc and said scraper about a rotational axis of the shaft so that said slurry is mixed and kneaded in said mixing area and the slurry is moved toward the periphery of the mixing area by centrifugal force acting on the slurry, whereby the slurry flows out of said mixing area through said slurry discharge port;
• and
• wherein a pin is provided to stand on a periphery of said rotary disc, so as to augment a fluid flow of said slurry flowing out of the mixing area through said slurry discharge port, and a distal end portion of said scraper is supported by said pin.

A mixer for preparation of gypsum slurry, which has a circular housing defining a mixing area for mixing and kneading of the gypsum slurry, a rotary disc positioned in the housing and rotated in a predetermined rotational direction, a rotary driving shaft integrally connected with the rotary disc, a scraper positioned in the mixing area, and a slurry discharge port provided on the housing for feeding the gypsum slurry of the mixing area onto a production line:

• wherein said rotary driving shaft extends through an upper or lower plate of said housing to be connected with said rotary disc;
• wherein an inner end portion of said scraper is positioned in a center region of said rotary disc, an outer end portion of the scraper is positioned in a peripheral zone of the disc, and the scraper is bent or curved backward in a rotational direction of the disc between said inner and outer end portions;
• and
• wherein a pin for augmenting a fluid flow of said slurry flowing out of the mixing area through said slurry discharge port is provided to stand on a periphery of said rotary disc and a distal end portion of said scraper is supported by said pin.

A mixing method for gypsum slurry with use of a mixer for preparation of the gypsum slurry, the mixer having a circular housing defining a mixing area for mixing and kneading of the gypsum slurry, a rotary disc positioned in the housing and rotated in a predetermined rotational direction, a rotary driving shaft integrally connected with the rotary disc, a scraper positioned in the mixing area, and a slurry discharge port provided on the housing for feeding the gypsum slurry of the mixing area onto a production line:

• wherein an inner end portion of said scraper is positioned in a center region of said rotary disc, an outer end portion of the scraper is positioned in a peripheral zone of the disc, and the scraper is bent or curved backward in a rotational direction of the disc, between said inner and outer end portions;
• wherein said rotary driving shaft extends through an upper or lower plate of said housing, and the shaft rotates said rotary disc and said scraper about a rotational axis of the shaft so that said slurry is mixed and kneaded in said mixing area;
• and
• wherein a pin is provided to stand on a periphery of said rotary disc, so as to augment a fluid flow of said slurry flowing out of the mixing area through said slurry discharge port, and a distal end portion of said scraper is supported by said pin.