US3746266A - Waste disintegrator rotor and ring assembly - Google Patents

Waste disintegrator rotor and ring assembly Download PDF

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Publication number
US3746266A
US3746266A US00185795A US3746266DA US3746266A US 3746266 A US3746266 A US 3746266A US 00185795 A US00185795 A US 00185795A US 3746266D A US3746266D A US 3746266DA US 3746266 A US3746266 A US 3746266A
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United States
Prior art keywords
rotor
epoxy resin
grinding
reinforcing means
accordance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00185795A
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English (en)
Inventor
R Knox
R Teague
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SPX Technologies Inc
Original Assignee
General Signal Corp
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Filing date
Publication date
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Publication of US3746266A publication Critical patent/US3746266A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/0084—Disintegrating by knives or other cutting or tearing members which chop material into fragments specially adapted for disintegrating garbage, waste or sewage
    • B02C18/0092—Disintegrating by knives or other cutting or tearing members which chop material into fragments specially adapted for disintegrating garbage, waste or sewage for waste water or for garbage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group

Definitions

  • ABSTRACT There is disclosed in this application a grinding rotor.
  • the rotor comprises alternate layers of epoxy resin and abrasive grit and is reinforced with metal wire and fiberglass strands.
  • the particular embodiment of the grinding rotor disclosed herein is adapted for use with waste disintegrators and is circumferentially surrounded by a ring which is also made of alternate layers of epoxy resin and abrasive grit. Reinforcing fiberglass strands are embedded in the ring to add rigidity.
  • This invention relates to a grinding rotor and, more particularly, relates to a grinding rotor adapted to be used in a waste disintegrator.
  • Waste disintegrators of the type used to grind solid particles in waste from commercial, industrial and agricultural facilities should be rugged, inexpensive and maintenance free.
  • a grinding rotor one face of which includes an abrasive grit and which has openings extending axially through its face to allow the passage of liquids and ground solids.
  • the rotor is mounted concentrically within and slightly spaced from a ring member to allow the passage of liquid and so that the edge of the rotor may also grind solid particles passing between the edge of the wheel and the ring.
  • a grinding rotor made of alternate layers of epoxy resin and silicon carbide grit and which is reinforced with metal wire and fiberglass strands.
  • the rotor may be used in a waste disintegrator and mounted so that it is concentrically surrounded by a ring which is also made of alternate layers of epoxy resin and silicon carbide grit and which is reinforced by fiberglass strands.
  • one face of the rotor is formed by the grit and performs the grinding function and openings extend through the face portions to allow the passage of liquid and ground solids.
  • the rotor may include circumferential wire and fiberglass strands and also laterally extending metal wires fonning a criss-cross pattern across the face of the rotor.
  • first and second bundles of fiberglass strands may extend laterally throughout the face of the rotor in a serpentine configuration and should extend at generally right angles to each other.
  • FIG. 1 is a schematic plan view of a waste disintegrator including a rotor and ring in accordance with this invention
  • FIG. 2 is an exploded perspective view illustrating the method of making a grinding rotor in accordance with this invention
  • FIG. 3 is a cross-sectional view of a grinding rotor made in accordance with this invention.
  • FIG. 4 is an exploded perspective view illustrating the method of making the ring in accordance with this invention.
  • FIG. 5 is a side view partly in section and having portions broken away for the sake of clarity of a ring made in accordance with this invention.
  • Waste disintegrator 10 carried in a sewage pipe P in which waste materials flow in the direction of arrow A.
  • Waste disintegrator 10 includes a suitable motor 12 which drives a grinding rotor 14 to grind solids in the waste material and reduce them to a suitable size.
  • Motor 12 may be either electric or hydraulic, but since in use the motor is immersed in liquid the use of a hydraulic motor is preferred.
  • a ring member 16 Surrounding rotor 14 and spaced slightly from the periphery thereof is a ring member 16 which is carried by housing 18 which generally includes a centering mechanism for holding waste disintegrator 10 in pipe P.
  • housing 18 By spacing ring 16 from rotor 14 liquid can flow around the periphery of the rotor and some small solids may be ground by the periphery of the grinding wheel.
  • the face of rotor 14 adjacent the inlet side of housing 18 is formed with an abrasive material which grinds solid particles in the waste and a plurality of apertures 20 extend through and between the faces of the rotor to allow the passage of liquid and the ground solid particles.
  • housing 18 does not engage the upper surface of pipe P and provides an emergency overflow for liquid in the event that the flow of waste should become excessive.
  • a suitable mold 22 either urethane, wax or any other suitable type, in which is formed a central cavity 24 corresponding in size to the desired size of the rotor.
  • a plurality of nubs 26 Projecting upwardly-from the mold are a plurality of nubs 26 corresponding in location and size to the desired location and size of apertures 20 in the rotor.
  • nubs 26 are shown as forming generally aligned rows and columns intersecting at generally right angles.
  • One of the nubs 27, however, is centrally located in cavity 24 and forms the opening through which the drive shaft of motor 12 projects.
  • a stainless steel wire 28 is placed adjacent the periphery of the mold so that it extends around the circumference of cavity 24.
  • Wire 28 need not be of stainless steel, but could be made from a variety of other metals which are preferably corrosion resistant. If the length of wire 28 is longer than the circumference of the mold, the ends of the wire should be interlooped.
  • a plurality of preferably stainless steel wires 30 are placed in cavity 24 so that one wire is located between adjacent rows of nubs and a second plurality of preferably stainless steel wires 32 are placed between adjacent columns of nubs so that one wire is located between adjacent columns of nubs. Wires 30 and 32, in plan view,
  • wires 30 and 32 also need not be of stainless steel, but could be made from a variety of other metals which are preferably corrosion resistant.
  • a thin layer of epoxy resin 34 is now poured into the mold and the bottom of the mold is uniformly coated so that wires 28, 30 and 32 are raised from the bottom of cavity 24 and are embedded in the epoxy resin.
  • various commercially available epoxy resins may be utilized and that one preferred epoxy resin includes shell 828 resin and a polyamide hardener.
  • a layer of abrasive grit 36 preferably silicon carbide, is placed over top of the epoxy resin and is levelled to a generally uniform depth.
  • a bundle 38 of fiberglass strands that is, silicon glass in fiber form, is placed adjacent the periphery of mold 22 so that it extends around the circumference of cavity 24.
  • a bundle 40 of fiberglass strands is placed between adjacent rows of nubs 26 so as to form a continuous fiberglass bundle extending throughout the area of cavity 24 in a serpentine configuration.
  • Another bundle 42 of fiberglass strands is placed between adjacent columns of nubs 26 so as to form a continuous fiberglass bundle extending throughout the area of cavity 24 in a serpentine configuration. It should be clear that bundles 40 and 42 intersect each other at spaced points between the nubs and that the angle of intersection is approximately 90, but can vary depending upon the pattern formed by the nubs.
  • More epoxy resin 44 is now poured into the mold and should be placed so that bundles 38, 40 and 42 of fiberglass are completely embedded in the resin.
  • the epoxy resin is levelled and a mounting disc 48 is now placed over center nub 27 of the mold so as to form a mounting aperture for securing the finished grinding rotor to the drive shaft of motor 12.
  • another layer 50 of silicon carbide grit is placed over the surface of the epoxy resin excluding the area of mounting disc 48 and is also levelled to a generally uniform depth.
  • the mold is now allowed to set for a predetermined period of time until the epoxy resin hardens. Curing can be accomplished at room temperatures in from about 24 to 48 hours, or can be accomplished in the presence of heat depending upon the specific epoxy resin used. After the resin has been hardened, grinding rotor 14 is removed from the mold and the openings 20 and the periphery of the grinding rotor is cleaned.
  • finished grinding rotor 14 is illustrated in cross-section and comprises alternate layers of epoxy resin 34 and 44 and silicon carbide grit 36 and 50.
  • One face of the grinding rotor is comprised of epoxy resin 34 and the other face is comprised of abrasive grit 50 and provides the working or grinding face of the rotor.
  • Wire 28 and fiberglass bundle 38 are carried in layers of epoxy resin 34 and 44, respectively, and provide rigidity to the periphery of rotor 14.
  • Lateral reinforcement for grinding wheel 14 is provided by the individual strips of wire 30 and 32 carried in epoxy resin layer 34 and also by the bundles 40 and 42 of fiberglass strands which are carried in epoxy resin layer 44. It should be noted that wires 32 and fiberglass bundle 42 are not shown in FIG. 3, but that they extend generally across the rotor at an angle to wires 32 and fiberglass bundles 40, respectively.
  • a suitable mold 52 either urethane, wax or any other suitable type, formed with an outer peripheral wall 54 and a central projection 56 so that an annular cavity 58 corresponding to the desired size of ring member 16 is provided.
  • Extending radially through wall 54 are a plurality of openings 57 which receive mounting inserts 59 by which ring 16 is secured to housing 18 of the waste disintegrator.
  • epoxy resin 60 is poured into cavity 58 and is levelled to form a relatively thin layer of resin.
  • a bundle 62 of fiberglass strands is placed throughout the circumference of annular cavity 58 and is embedded in the epoxy resin 60.
  • abrasive grit 64 preferably silicon carbide, is placed in the mold and is also levelled to form a relatively thin layer.
  • Mounting inserts 59 may now be inserted into openings 57 in wall 54.
  • more epoxy resin 66 is poured into the mold to form a thin layer which should cover mounting inserts 59 and is followed by more grit 68 which, in turn, is followed by still more epoxy resin 70. All of the resin and grit is formed into relatively thin layers.
  • the mold is now allowed to set for a predetermined period of time to allow the epoxy resin to cure in a manner similar to mold 22 when forming rotor 14. It should be noted that more fiberglass bundles could be embedded in epoxy resin layers 66 and 70 if desired. After the epoxy resin has hardened, ring 16 is removed from the mold and cleaned.
  • ring 16 comprises layers of epoxy resin 60, grit 64, epoxy resin 66, grit 66 and epoxy resin 70.
  • Fiberglass bundle 62 is carried in layer 60 epoxy resin and mounting inserts 59 are also carried in a layer of epoxy resin.
  • Mounting inserts 59 may be of any suitable type and are illustrated as internally threaded sleeves.
  • a grinding rotor comprising alternate layers of epoxy resin and abrasive grit and reinforcing means imbedded in at least some of said layers of epoxy resin, said reinforcing means comprising metal wire and bundles of fiberglass strands.
  • a grinding rotor in accordance with claim 1 wherein one face of said rotor is formed by a layer of grit and wherein a plurality of openings extend from said one face through to the other face of said rotor.
  • a waste disintegrator comprising a motor having a drive shaft carrying a grinding rotor, said grinding rotor comprising alternate layers of epoxy resin and abrasive grit and having a plurality of holes extending through the face portions thereof, some of said layers of epoxy resin including reinforcing means extending circumferentially and laterally therein, said rotor being concentric with and spaced from a ring member, said ring member comprising alternate layers of epoxy resin and grit and having reinforcing means extending circumferentially in at least some of some layers of epoxy resin.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Laminated Bodies (AREA)
US00185795A 1971-10-01 1971-10-01 Waste disintegrator rotor and ring assembly Expired - Lifetime US3746266A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US18579571A 1971-10-01 1971-10-01

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US3746266A true US3746266A (en) 1973-07-17

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US00185795A Expired - Lifetime US3746266A (en) 1971-10-01 1971-10-01 Waste disintegrator rotor and ring assembly

Country Status (6)

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US (1) US3746266A (enrdf_load_stackoverflow)
JP (1) JPS4842450A (enrdf_load_stackoverflow)
CA (1) CA973714A (enrdf_load_stackoverflow)
DE (1) DE2248336A1 (enrdf_load_stackoverflow)
FR (1) FR2155447A5 (enrdf_load_stackoverflow)
GB (1) GB1347190A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3815827A (en) * 1972-09-11 1974-06-11 Gen Signal Corp Waste disintegrator
US3880368A (en) * 1973-03-12 1975-04-29 Beloit Corp Pulp refiner element
US3896593A (en) * 1974-04-08 1975-07-29 Carborundum Co Reinforced bonded abrasive cup wheel
US4164098A (en) * 1976-09-13 1979-08-14 Hiroshi Akita Grinding wheel
US4228962A (en) * 1979-06-14 1980-10-21 Whirlpool Corporation Comminuting liquid swirler
US4767070A (en) * 1985-12-28 1988-08-30 Masamichi Nagao Grinder for use in grinding apparatus
WO2011031580A3 (en) * 2009-09-09 2011-07-07 Pratt & Whitney Rocketdyne, Inc. Biomass torrefaction mill

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50141648A (enrdf_load_stackoverflow) * 1974-05-02 1975-11-14
JPS5734153A (en) * 1980-08-08 1982-02-24 Teijin Chem Ltd Resin composition
JPS59223750A (ja) * 1983-06-03 1984-12-15 Idemitsu Petrochem Co Ltd ポリカ−ボネ−ト樹脂組成物
SE516050C2 (sv) * 2000-03-15 2001-11-12 Valmet Fibertech Ab Malelement för en malskiva för skivkvarnar

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3815827A (en) * 1972-09-11 1974-06-11 Gen Signal Corp Waste disintegrator
US3880368A (en) * 1973-03-12 1975-04-29 Beloit Corp Pulp refiner element
US3896593A (en) * 1974-04-08 1975-07-29 Carborundum Co Reinforced bonded abrasive cup wheel
US4164098A (en) * 1976-09-13 1979-08-14 Hiroshi Akita Grinding wheel
US4228962A (en) * 1979-06-14 1980-10-21 Whirlpool Corporation Comminuting liquid swirler
US4767070A (en) * 1985-12-28 1988-08-30 Masamichi Nagao Grinder for use in grinding apparatus
WO2011031580A3 (en) * 2009-09-09 2011-07-07 Pratt & Whitney Rocketdyne, Inc. Biomass torrefaction mill

Also Published As

Publication number Publication date
JPS4842450A (enrdf_load_stackoverflow) 1973-06-20
CA973714A (en) 1975-09-02
FR2155447A5 (enrdf_load_stackoverflow) 1973-05-18
DE2248336A1 (de) 1973-04-12
GB1347190A (en) 1974-02-27

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