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US3862719A - Ball mill for treating used casting sand - Google Patents

Ball mill for treating used casting sand Download PDF

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Publication number
US3862719A
US3862719A US356984A US35698473A US3862719A US 3862719 A US3862719 A US 3862719A US 356984 A US356984 A US 356984A US 35698473 A US35698473 A US 35698473A US 3862719 A US3862719 A US 3862719A
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United States
Prior art keywords
drum
sand
ball mill
disposed
recited
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Expired - Lifetime
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US356984A
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English (en)
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Karl A Muller
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Individual
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Individual
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Priority claimed from DE19722233923 external-priority patent/DE2233923C3/de
Application filed by Individual filed Critical Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/06—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sieving or magnetic separating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S241/00—Solid material comminution or disintegration
    • Y10S241/10—Foundry sand treatment

Definitions

  • ABSTRACT [30] Foreign Application Priority Dam A ball mill for treating and washing used casting sand June 15, 1972 Germany 2229088 has a drum that includes an interior and exterior wall, July 11, 1972 Germany 2233923 The space between these interior and exterior walls form an intermediate chamber. Disposed along the ex- Cl l/ 8 terior wall is a screen through which passes the treated l0 sand.
  • the drum may be positioned on an inclination [51] Int. Cl. 1302c 17/06, B07b 1/24 with repect to the horizontal and has contained within Field of Search its interior a plurality of mill balls.
  • Feeding means are L placed at, and comprise one end of the drum.
  • the 164/5 feeding means are placed so as to be concentric about the central longitudinal axis of the drum.
  • Means are [56] References Cited placed within the intermediate chamber to subdivide it UNlTED STATES PATENTS into compartments. A continuously operating dis- 594422 11/1897 Paul 241/179 X charge'means is dispmd at and comprise? the 242,423 10/1917 Cover-m 24m79X end of the drum so that the metallic residue of the 2,743,060 4/1956 Daman 241/183 casting Sand migrates towards the discharge means 3,180,581 4/1965 Velcheff 241/171 X and exits thereat as the drum revolves.
  • the ball mill essentially consists of a drum containing mill balls, whereby the jacket or casing of the drum has a double wall and is formed like a screen (sieve), and a feeding means for the material in the height of the drum axis.
  • Such devices treat or wash sand from foundries. separate core pins, as well as metal pieces from the sand.
  • the sand molds which are used in foundries cannot be used again after the mold or cast is finished.
  • the sand molds are merely remotely stored. However, valuable material is lost because these sand molds contain metal pieces and useable core sand.
  • a mold sand treatment or washing installation is known from German Pat. No. 425,713.
  • screen or sieve drums are concentrically disposed one about the other.
  • the screen drums are surrounded by a jacket or casing.
  • These drums are formed in a polygon-like manner and are mounted eccentrically on a rotating shaft.
  • the shaft rotates counterclock-wise with respect to the rotation of the jacket.
  • On the outer circumference of the outer screen On the outer circumference of the outer screen, oblique transport shovels, paddles and kneading means are provided.
  • a ball mill having a screen type jacket is provided in the end of the inner screen drum and is larger in its diameter.
  • this device is not really a ball mill in the conventional sense, but a device in which different operating steps for making mold sand are combined.
  • the ball mill itself is in the shape of a cylinder and the balls are in the inside of the cylinder. This device does not permit a continuous mode of operation.
  • a mixing drum for sand treatment is known from German Petty Pat. No. 1,905,629.
  • This patent teaches the use of a cylindrical body wherein heavy ball-like mill bodies are provided. The sand is fed into the device on one side together with the desired binder and drops through a screen on the opposite end. In this drum only sand, already milled, can be used and it must be separated from all residue. In order to pick up agglomerates, while simultaneously obtaining an even coating of the granules by the binder, this device merely crushes or kneads the sand in any suitable manner.
  • the present invention overcomes the disadvantages of the aforementioned devices by discharging the residue or remains in a continuous manner. This is achieved by utilizing a drum jacket or casing having an inclination with respect to the horizontal.
  • the apparatus includes intermediate chambers which are longitudinally or axially subdivided.
  • a continuously operating ring-like discharge opening for the noncrushable residue is provided opposite the feeding portion of the drum.
  • the ball mill according to the present invention is further characterized in that a hollow cylinder is provided as the discharge means for the residue.
  • the drum may be provided with its jacket or casing face disposed horizontally.
  • the apparatus places a plurality of rings between the inner bars of the drum and the outer screen or sieve thus subdividing the drum intermediate screen chamber into a plurality of sections.
  • a return transport bar is mounted for each section.
  • the material is fed through a hollow drum shaft. Guiding pieces are mounted on the inner bars of the drum.
  • a double walled drum, partly containing a defined size of balls is charged at the feed opening through a funnel and hollow shaft.
  • the drum is mounted with an inclination descending toward the discharge opening.
  • a plate is provided at the front face of the discharge opening, leaving a ring- ]ike opening between the inner walls of the drum and the edge of the plate. This ring-like opening is such that balls cannot pass through. Consequently, the drum has a drum end section or zone into which the'residue and the core pins of the sand may enter, but in which no balls are present. In this end section or zone the jacket face has openings so that the residue falls out radially.
  • the drum is subdivided into a number of sections, which reach to the end section of the drum, by a plurality of outer rings arranged over the inner jacket bars. Above this a screen'jacket is mounted having defined screen mesh sizes. Sand and residue up to a defined size can fall through the slots of the inner jacket. Sand which is smaller in diameter than the mesh size of the screen falls through the screen for recycling. Larger parts are thrown back into the inner chamber of the drum through an opening at each rotation of the drum. The balls again crush these parts which then travel along the descending incline towards the discharge opening. Owing to repeated screening in the radial sections, increasing amounts of sand are screened out. Eventually the residue arrives at the last drum section or zone where they are discharged. Accordingly, sand clumps will be completely crushed and the metal parts will be freed from sand. Thus, continuous and economical sand recycling is assured. Owing to a link dust removal installation, the sand may be removed for immediate use.
  • the drum For material having a relatively high temperature the drum may be mounted on rollers.
  • the rollers of the bearing at the discharge opening are supported by an axial pressure bearing.
  • the rollers at the charge openings are not provided with axial pressure bearings. This type of bearing can be adjusted to the desired requirements.
  • the drum is mounted horizontally and the guide sheet metal is mounted on the inner wall bars, for guiding the material in the direction of the drum end section (zone).
  • This sheet metal is mounted helically on these inner wall bars.
  • the inner wall bars in the end section of the drum have openings. These are sized so that the residue will be discharged but not the mill balls.
  • material is fed through a hopper and a hollow shaft into the inner drum chamber.
  • the inner drum chamber is mounted without an incline but has a double wall and is cylindrical and partly filled with balls.
  • the material is crushed by the balls until it falls through the slots of the inner screen jacket upon reach ing the proper mesh size. Or, the material is transported by the sheet metal guides in the direction of the drum end section. In this end section an additional section or zone is provided having no outer screen, but has openings through which the residue may fall. The openings are of smaller size to block the balls. Consequently, sand is screened out of the material and the residue is discharged at the end of the drum. Mounting the drum horizontally avoids special incline mounts for its support bearings. Construction and assembly of the drum according to the invention is substantially facilitated.
  • FIG. 1 is a broken side view of the inventive apparatus
  • FIG. 2 is a sectional view of the device of FIG. I taken on the line II of FIG. 1 through the last chamber from the discharge opening to the charge opening;
  • FIG. 3 is a roller bearing in a side view
  • FIG. 4 is a simplified roller bearing in a front view
  • FIG. 5 is a broken side view of another embodiment of the invention having a horizontally mounted drum.
  • FIG. 6 is the device taken along section A-B of FIG. 5.
  • a drive 1 shown in part, revolves the drum in direction D.
  • the outer periphery of the drum forms a screen casing 2 which encompasses drum rings 3 up to a discharge chamber 8.
  • An inner casing comprises inner bars 13 and the return guide bars 15. These are mounted within drum rings 3 as shown.
  • Discharge chamber 8 does not have a screen drum and also lacks two inner wall bars 13 and the return bar 15, so that large metal parts and large materials may be discharged.
  • Free spaces are provided between the inner jacket bars 13 to form slots 14 through which material falls when having a diameter which is smaller than the width of slots 14.
  • the material which falls through the mesh of screen drum 2 falls into sand funnel 16a with a discharge opening 16. Larger material is thrown back into the inner chamber of the drum by return guide bars as the drum revolves. The material is further crushed by balls 12 and travels slowly toward the discharge chamber 8 due to drum inclination angle A as seen in FIG. 1. While traveling in the direction 8. the material falls into ring-like screen chambers 4. Consequently. more and more sand is removed, and finally only the larger pieces and the desired metal pieces reach discharge chamber 8.
  • Material 7 which at the beginning is contaminated with sand is poured into hopper 6. It is fed through the hollow shaft 5 and into the drum.
  • guide pieces 17 or 18 or a combination thereof may be mounted on the inner casing bars 13 in order to obtain the desired openings or rotational characteristics, or both.
  • FIGS. 5 and 6 a ball mill is shown having the drum in a horizontal position. Additional sheet metal guide pieces 21 are mounted helically on the inner casing bars 13 so that material 7 is moved from hopper 6 in direction C as shown. The material 7 is crushed by balls 12 until one part falls through screen 2 into hopper 16. The part which does not fall into the funnel 16, but remains on screen 2, is thrown back into the inner chamber of the drum by means of return guides 15 and is again crushed. Material which cannot be crushed, for example, core pins or metal parts 10 are moved by the guide bars 21 in the direction of C and fall downwardly through recesses 20 into hopper 11. The openings 20 are sized so that only residue parts 10 can fall through. Mill balls 12 are too large to pass through apertures 20 and remain in the drum.
  • FIGS. 3 and 4 there is shown the bearing mount used for supporting end shaft 22.
  • the mount is used if the material entering the apparatus is at a high temperature.
  • Bearings 25 disposed on frame 26a and supporting shaft 22 would be placed on the apparatus of FIGS. 1, 2, 5, and 6.
  • frame 26a would replace frame 26 andassociated bearings of FIGS. 1 and 6 so that a shaft neck 23 of shaft 22 would ride the periphery of roller bearings 25 as seen in FIG. 3.
  • shoulder 23a of shaft 22 thrusts against a side of bearing 25 as shown.
  • Axial pressure bearing 24 engages the other side of bearing 25, so that bearing 24 acts as a rotatable thrust support. As shown the entire bearing apparatus is supported on frame 26a.
  • a ball mill for recovering sand from a charge of used casting sand containing metallic residue comprising a drum having an interior wall and an exterior wall forming an intermediate chamber therebetween. the exterior wall including a screen through which sand is screened while continuously leaving said drum as recovered sand;
  • continuously operating discharge means disposed at said opposite end of the drum and provided with openings sized to permit the discharge of said metallic residue while retaining said balls.
  • a ball mill as recited in claim 3 wherein said means for longitudinally subdividing comprises a plurality of rings placed within the intermediate chamber formed between the interior and exterior walls and residing on the periphery of said plurality of inner bars, said rings subdividing the intermediate chamber into a plurality of intermediate screen chambers allowing the sand to pass therethrough.
  • a ball mill as recited in claim 4 wherein said discharge means comprises:
  • jacket means disposed about said periphery of brackets and said plate so that as the metallic residue migrates through the annular gap it drops into said jacket means and exits the ball mill.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crushing And Grinding (AREA)
US356984A 1972-06-15 1973-05-03 Ball mill for treating used casting sand Expired - Lifetime US3862719A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2229088 1972-06-15
DE19722233923 DE2233923C3 (de) 1972-07-11 1972-07-11 Kugelmühle zum Aufbereiten von gebrauchtem Gießereiformsand

Publications (1)

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US3862719A true US3862719A (en) 1975-01-28

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CH (1) CH561574A5 (xx)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4060204A (en) * 1976-10-22 1977-11-29 No Flame Process, Inc. Cremated remains processor
US4674691A (en) * 1985-10-24 1987-06-23 Didion Manufacturing Company Dual sand reclaimer
AU573606B2 (en) * 1983-08-08 1988-06-16 Combustion Engineering Inc. Treating used foundry sand and the like
US5034035A (en) * 1989-12-15 1991-07-23 George Fischer Ag Device for preparing bulk material with a dust removal arrangement
US5062601A (en) * 1989-09-21 1991-11-05 Pennsylvania Crusher Corporation Mill screen apparatus
US5183213A (en) * 1991-07-30 1993-02-02 Knez Building Materials Company Method for recycling wallboard
US5193752A (en) * 1991-12-27 1993-03-16 Nakaya Jitsugyo Co., Ltd. Method of making concrete sand
US5238195A (en) * 1991-07-30 1993-08-24 Knez Building Materials Company Method for recycling wallboard
WO1994019105A1 (en) * 1993-02-03 1994-09-01 Aktsionernoe Obschestvo Kamaz Binding suspension, a process and device for obtaining the same, and the use of the said binding suspension in a coating to prevent metal penetration, in a compound for cleaning sanitary equipment and in a mixture for producing building materials
US5492278A (en) * 1993-11-09 1996-02-20 Raboin; James P. Single motion mobile fluorescent lamp crusher, cleaner and material classifier
US5613902A (en) * 1996-03-25 1997-03-25 Didion Manufacturing Company Sand reclaimer
US5794865A (en) * 1995-07-25 1998-08-18 Didion Manufacturing Company Rotary crusher/reclaimer for reclaiming and reclassifying sand and related aggregates from lump materials
US6070817A (en) * 1988-02-12 2000-06-06 Yanase; Shigeo Pulverizer
US20100176034A1 (en) * 2006-02-17 2010-07-15 Meiji University Legal Person Powder separator and method of powder separation
CN103127985A (zh) * 2011-12-01 2013-06-05 洛阳宇航重工机械有限公司 较大型破磨氧化铝结壳块的破磨机
US20140169123A1 (en) * 2012-12-14 2014-06-19 Hyundai Motor Company Apparatus for dispersing nanocomposite material
RU2537594C1 (ru) * 2013-07-19 2015-01-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Ярославский государственный технический университет" Устройство для получения клея
CN105268628A (zh) * 2015-11-20 2016-01-27 金川集团股份有限公司 一种筛分镍残极的滚筒筛分机
US20160222585A1 (en) * 2013-09-03 2016-08-04 Meri Environmental Solutions Gmbh Device and Method for Processing Composite Materials Containing Fibers
CN106238306A (zh) * 2016-08-24 2016-12-21 江西稀有稀土金属钨业集团有限公司 合金球清理器以及球料混合物的自动分离方法与装置
US20170014829A1 (en) * 2015-07-17 2017-01-19 Lankota Group, Inc. Ball mill for malleable material recovery
CN108296438A (zh) * 2017-08-30 2018-07-20 柳州市柳晶科技股份有限公司 一种铸造废砂打磨回收装置
CN109012904A (zh) * 2018-08-10 2018-12-18 安徽万磁电子有限公司 球磨混料装置
CN111729835A (zh) * 2020-06-30 2020-10-02 福州凯辉铭机械设备有限公司 一种建筑机械筛沙机
CN111744872A (zh) * 2020-06-30 2020-10-09 江西省威尔国际矿业装备有限公司 筛分洗沙一体机
CN111744608A (zh) * 2020-07-02 2020-10-09 赵宇 一种废弃钢渣回收再处理方法
CN118543426A (zh) * 2024-06-21 2024-08-27 连云港瑞创新材料科技有限公司 一种防堵塞自动排料的球磨机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US594422A (en) * 1897-11-30 Pulverizing machinery
US1242423A (en) * 1916-10-28 1917-10-09 John W Cover Grinding-mill.
US2743060A (en) * 1954-11-12 1956-04-24 Mining Process & Patent Co Ball mill with risers on liners to throw balls and oversize material towards feed end of mill and to progress smaller balls and fine material towards discharge end of mill
US3180581A (en) * 1962-07-19 1965-04-27 Reserve Mining Co Ball mill discharge trommel
US3545687A (en) * 1968-06-27 1970-12-08 Martin Marietta Corp Media mill

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US594422A (en) * 1897-11-30 Pulverizing machinery
US1242423A (en) * 1916-10-28 1917-10-09 John W Cover Grinding-mill.
US2743060A (en) * 1954-11-12 1956-04-24 Mining Process & Patent Co Ball mill with risers on liners to throw balls and oversize material towards feed end of mill and to progress smaller balls and fine material towards discharge end of mill
US3180581A (en) * 1962-07-19 1965-04-27 Reserve Mining Co Ball mill discharge trommel
US3545687A (en) * 1968-06-27 1970-12-08 Martin Marietta Corp Media mill

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4060204A (en) * 1976-10-22 1977-11-29 No Flame Process, Inc. Cremated remains processor
AU573606B2 (en) * 1983-08-08 1988-06-16 Combustion Engineering Inc. Treating used foundry sand and the like
US4674691A (en) * 1985-10-24 1987-06-23 Didion Manufacturing Company Dual sand reclaimer
US6070817A (en) * 1988-02-12 2000-06-06 Yanase; Shigeo Pulverizer
US5062601A (en) * 1989-09-21 1991-11-05 Pennsylvania Crusher Corporation Mill screen apparatus
US5034035A (en) * 1989-12-15 1991-07-23 George Fischer Ag Device for preparing bulk material with a dust removal arrangement
AU631703B2 (en) * 1989-12-15 1992-12-03 Georg Fischer Aktiengesellschaft Device for preparing bulk material with a dust removal arrangement
US5238195A (en) * 1991-07-30 1993-08-24 Knez Building Materials Company Method for recycling wallboard
US5183213A (en) * 1991-07-30 1993-02-02 Knez Building Materials Company Method for recycling wallboard
US5193752A (en) * 1991-12-27 1993-03-16 Nakaya Jitsugyo Co., Ltd. Method of making concrete sand
WO1994019105A1 (en) * 1993-02-03 1994-09-01 Aktsionernoe Obschestvo Kamaz Binding suspension, a process and device for obtaining the same, and the use of the said binding suspension in a coating to prevent metal penetration, in a compound for cleaning sanitary equipment and in a mixture for producing building materials
US5492278A (en) * 1993-11-09 1996-02-20 Raboin; James P. Single motion mobile fluorescent lamp crusher, cleaner and material classifier
US5794865A (en) * 1995-07-25 1998-08-18 Didion Manufacturing Company Rotary crusher/reclaimer for reclaiming and reclassifying sand and related aggregates from lump materials
US5613902A (en) * 1996-03-25 1997-03-25 Didion Manufacturing Company Sand reclaimer
US20100176034A1 (en) * 2006-02-17 2010-07-15 Meiji University Legal Person Powder separator and method of powder separation
CN103127985A (zh) * 2011-12-01 2013-06-05 洛阳宇航重工机械有限公司 较大型破磨氧化铝结壳块的破磨机
US20140169123A1 (en) * 2012-12-14 2014-06-19 Hyundai Motor Company Apparatus for dispersing nanocomposite material
US9314752B2 (en) * 2012-12-14 2016-04-19 Hyundai Motor Company Apparatus for dispersing nanocomposite material
RU2537594C1 (ru) * 2013-07-19 2015-01-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Ярославский государственный технический университет" Устройство для получения клея
US20160222585A1 (en) * 2013-09-03 2016-08-04 Meri Environmental Solutions Gmbh Device and Method for Processing Composite Materials Containing Fibers
US9938661B2 (en) * 2013-09-03 2018-04-10 Meri Environmental Solutions Gmbh Device and method for processing composite materials containing fibers
US10118179B2 (en) * 2015-07-17 2018-11-06 Lankota Group, Inc. Ball mill for malleable material recovery
US20170014829A1 (en) * 2015-07-17 2017-01-19 Lankota Group, Inc. Ball mill for malleable material recovery
US10828645B2 (en) 2015-07-17 2020-11-10 Lankota Group, Inc. Ball mill for malleable material recovery
CN105268628A (zh) * 2015-11-20 2016-01-27 金川集团股份有限公司 一种筛分镍残极的滚筒筛分机
CN106238306A (zh) * 2016-08-24 2016-12-21 江西稀有稀土金属钨业集团有限公司 合金球清理器以及球料混合物的自动分离方法与装置
CN108296438A (zh) * 2017-08-30 2018-07-20 柳州市柳晶科技股份有限公司 一种铸造废砂打磨回收装置
CN109012904A (zh) * 2018-08-10 2018-12-18 安徽万磁电子有限公司 球磨混料装置
CN109012904B (zh) * 2018-08-10 2020-07-10 安徽万磁电子有限公司 球磨混料装置
CN111729835A (zh) * 2020-06-30 2020-10-02 福州凯辉铭机械设备有限公司 一种建筑机械筛沙机
CN111744872A (zh) * 2020-06-30 2020-10-09 江西省威尔国际矿业装备有限公司 筛分洗沙一体机
CN111744608A (zh) * 2020-07-02 2020-10-09 赵宇 一种废弃钢渣回收再处理方法
CN118543426A (zh) * 2024-06-21 2024-08-27 连云港瑞创新材料科技有限公司 一种防堵塞自动排料的球磨机

Also Published As

Publication number Publication date
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