# US 10,307,767 B2 · Rotary drum-type magnetic separator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,307,767 B2 - Document ID: US10307767B2 - Status: Granted - Kind: B2 - Application number: 15/476,606 - Filed: 2017-03-31 - Published: 2017-07-20 - Granted: 2019-06-04 - Earliest claimed: 2014-10-01 - Assignees: Sumitomo Heavy Industries Finetech, Ltd. - Applicants: Sumitomo Heavy Industries Finetech, Ltd. - Inventors: Shinya Nishizawa - Web page: https://patentgrep.com/patent/US10307767B2 ## CPC - B03C 1/12: with magnets moving during operation; with movable pole pieces - B03C 1/0332: {using permanent magnets} - B03C 1/14: with non-movable magnets - B03C 2201/18: Magnetic separation whereby the particles are suspended in a liquid - B03C: MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS (separating isotopes B01D59/00; combinations of magnetic or electrostatic separation with separation of solids by other means B03B, B07B) ## Abstract A rotary drum-type magnetic separator includes a first rotary drum on which a plurality of magnets are disposed and separates unnecessary objects from a used coolant liquid. A second rotary drum on which a plurality of magnets are disposed is provided before the first rotary drum in a direction in which the used coolant liquid flows separately from the first rotary drum. The second rotary drum includes an outer tube and an inner tube. A scraper which scrapes off the unnecessary objects attached to the second rotary drum is connected to a bottom member which forms a flow path below the first rotary drum. ## Claims ### Claim 1 A rotary drum-type magnetic separator which separates magnetic substances from a used coolant liquid, comprising: a first rotary drum on which first rotary drum magnets are disposed; a second rotary drum on which second rotary drum magnets are disposed; and a scraper configured to scrape off the magnetic substances that are attached to the second rotary drum, wherein the used coolant liquid is flowable along a flow path in a manner that the used coolant liquid flowing in the flow path comes into contact with the second rotary drum before contacting the first rotary drum, the first rotary drum is after the second rotary drum along the flow path. ### Claim 2 (depends on 1) The rotary drum-type magnetic separator according to claim 1, wherein the scraper is inclined to descend toward the first rotary drum side from the second rotary drum side. ### Claim 3 (depends on 1) The rotary drum-type magnetic separator according to claim 1, wherein the second rotary drum includes a strong magnetic portion that has a strong magnetic force and a weak magnetic portion that has a weak magnetic force that is weaker than the strong magnetic force. ### Claim 4 (depends on 1) The rotary drum-type magnetic separator according to claim 1, wherein the second rotary drum magnets include multiple sets of magnets, one of the multiple sets of magnets includes north-polarity magnet that is adjacent to a south-polarity magnet. ### Claim 5 (depends on 4) The rotary drum-type magnetic separator according to claim 4, wherein the south-polarity magnet has a polarity that is opposite to the north-polarity magnet. ### Claim 6 (depends on 4) The rotary drum-type magnetic separator according to claim 4, wherein a thickness of the north-polarity magnet is thicker than a thickness of the south-polarity magnet. ### Claim 7 (depends on 4) The rotary drum-type magnetic separator according to claim 4, wherein the one of the multiple sets of magnets is adjacent to a different the one of the multiple sets of magnets, the different one of the multiple sets of magnets includes a different north-polarity magnet that is adjacent to a different south-polarity magnet. ### Claim 8 (depends on 7) The rotary drum-type magnetic separator according to claim 7, wherein the different south-polarity magnet has a polarity that is opposite to the different north-polarity magnet. ### Claim 9 (depends on 7) The rotary drum-type magnetic separator according to claim 7, wherein the north-polarity magnet and the different north-polarity magnet are of a same polarity. ### Claim 10 (depends on 7) The rotary drum-type magnetic separator according to claim 7, wherein the south-polarity magnet and the different south-polarity magnet are of a same polarity. ### Claim 11 (depends on 7) The rotary drum-type magnetic separator according to claim 7, wherein the north-polarity magnet is adjacent to the different north-polarity magnet. ### Claim 12 (depends on 7) The rotary drum-type magnetic separator according to claim 7, wherein the south-polarity magnet is adjacent to the different south-polarity magnet. ### Claim 13 (depends on 7) The rotary drum-type magnetic separator according to claim 7, wherein along a peripheral surface of the second rotary drum, a distance between the north-polarity magnet and the south-polarity magnet differs from a distance between the north-polarity magnet and the different south-polarity magnet. ### Claim 14 (depends on 1) The rotary drum-type magnetic separator according to claim 1, wherein the second rotary drum includes an outer tube and an inner tube, the second rotary drum magnets are disposed on the inner tube. ### Claim 15 (depends on 14) The rotary drum-type magnetic separator according to claim 14, wherein the outer tube is fixed and the inner tube rotates inside the outer tube. ### Claim 16 (depends on 14) The rotary drum-type magnetic separator according to claim 14, wherein the inner tube is fixed and the outer tube rotates outside the inner tube. ### Claim 17 (depends on 14) The rotary drum-type magnetic separator according to claim 14, wherein the inner tube and the outer tube rotate with respect to each other. ### Claim 18 (depends on 1) The rotary drum-type magnetic separator according to claim 1, further comprising: a bottom member which forms a flow path below the first rotary drum, wherein the scraper is attached to the bottom member so as to abut to the second rotary drum. ### Claim 19 A rotary drum-type magnetic separator which separates magnetic substances from a used coolant liquid, comprising: a first rotary drum on which a plurality of magnets are disposed; a second rotary drum that is situated before the first rotary drum in a direction in which the used coolant liquid flows such that the magnetic substances are adsorbed to each other; and a scraper configured to scrape off the magnetic substances that are attached to the second rotary drum, wherein the second rotary drum includes a strong magnetic portion that has a magnetic force and a weak magnetic portion that has a magnetic force weaker than the magnetic force of the strong magnetic portion, and wherein the strong magnetic portion and the weak magnetic portion are at equal intervals on a peripheral surface of the second rotary drum. ### Claim 20 (depends on 1) The rotary drum-type magnetic separator according to claim 1, wherein the magnetic substances that are scraped off by the scraper are introduced to the first rotary drum along the flow of the used coolant liquid in a state where sizes of the magnetic substances scraped off by the scraper are increased.