US3608841A - Rotary impact crusher - Google Patents

Rotary impact crusher Download PDF

Info

Publication number
US3608841A
US3608841A US806556A US3608841DA US3608841A US 3608841 A US3608841 A US 3608841A US 806556 A US806556 A US 806556A US 3608841D A US3608841D A US 3608841DA US 3608841 A US3608841 A US 3608841A
Authority
US
United States
Prior art keywords
impeller
blade
blades
rotary impact
baffle
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
US806556A
Other languages
English (en)
Inventor
Franz Wageneder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3608841A publication Critical patent/US3608841A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/26—Details
    • B02C13/28—Shape or construction of beater elements
    • B02C13/2804—Shape or construction of beater elements the beater elements being rigidly connected to the rotor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/02—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft
    • B02C13/06—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor
    • B02C13/09—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor and throwing the material against an anvil or impact plate
    • B02C13/095—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor and throwing the material against an anvil or impact plate with an adjustable anvil or impact plate

Definitions

  • the blades are inclined into the direction of impeller rotation at angles of 25 to 45 and have outside edges lying along the orbit. Strips of resilient material wedge the blades into channels in the 'impeller. Like blades are mounted on the bafi'le, the faces of these blades being positioned complementarily to the impeller blades.
  • a rotary disintegrator such as a rock crusher or hammermill, serving for the comminution of solid materials into particles of predetermined maximum size, may have a curved grate extending along the orbit of a set of peripheral blades on a horizontally positioned rotor or impeller.
  • the grate defines with the blade orbit a clearance which converges in the direction of rotation and which subjects the larger fragments of the entrained solids to the crushing action of the blades acting against the bars of the grate.
  • the width of this clearance can be easily maintained within the required tolerances.
  • the percentage of the finer particles passed by the grate diminishes and the yield of the disintegrator decreases.
  • an increasing proportion of the treated material experiences indirect grinding between other particles, rather than between the rotor blades and the grate, which adds to the frictional resistance encountered by the rotor, thus further lowering the efficiency of the system.
  • the wear of the disintegrator parts engaged in the crushing process i.e. the rotor blades and the grate bars
  • the first grate will then serve mainly for a coarse precomminution with separation of all the fine particle sizes as well as entrained sand, rubble and the like from the bulk of the mass; the second grate then receives the already precomminuted material so that it, too, does not have to perform more than a fraction of the task conventionally as signed to a single grate.
  • the two grates are so disposed that the discharge end of the clearance formed between the first grate and the blade orbit, which can be substantially constant width, is narrower than the entrance end of the converging clearance defined by the second grate and the orbit, the two clearances being separated by small peripheral gap which preferably is located at the nadir of the rotor.
  • the first grate may extend along the lower quadrant of the blade orbit at the descending side of the blades while the second grate hugs the lower quadrant on the ascending side, this latter grate having its entrance edge disposed at a level lower than that of a confronting discharge edge of the first grate so as to lie beneath the trajectories of the heavier particles emerging more or less horizontally from the outlet end of the first clearance. Fragments that are not sufficiently comminuted even at the second grate leave the second clearance in a generally upward direction and are intercepted by an inclined deflector plate (including an angle of, say, to 30 with the horizontal) directing them away from the rotor so as to prevent their further entrainment.
  • an inclined deflector plate including an angle of, say, to 30 with the horizontal
  • These latter particles may be caused to drop into a separate receptacle or, if commingled with the remainder of the comminuted mass, may be subsequently removed therefrom by sifting.
  • the second grate may be mounted on a carriage within a compartment separated by a partition from the grind ing chamber of the disintegrator, this carriage allowing for both horizontal and vertical as well as angular adjustment of that grate to facilitate changing the width of the integrate gap and varying the effective width and rate of convergence of the second clearance.
  • the disintegrator housing For purposes of ease of accessibility in the case of inspection, replacement or repair. I prefer to subdivide the disintegrator housing into two portion substantially along a plane vertically bisecting the rotor, the two portions being normally locked to each other by manually or otherwise disengageable mating formations such as a set of slotted lugs cooperating with respective tenons. When detached from each other, the portions may be moved apart to accommodate, for example, a working platform that may be suspended from an overhead crane or may be rested on the split housing portions. In this manner, access can also be had to a breaker plate carried on the support for the first grate, this plate being preferably symmetrical and, therefore, reusable in a reversed position after unilateral wear.
  • Another feature of previous invention resides in the provision of an elevated base supporting the rotor and its drive motor, this base lying for the most part near the level of the rotor axis so as not to interfere with the swingable support for the first grate.
  • the base In the region of the rotor axis the base forms a pair of dependent yokes carrying bearings for the rotor shaft.
  • the base consists of a pair of rails, integral with the aforementioned yokes, for the guidance of the movable housing portion.
  • Another object is to provide such a crusher wherein the amount of wear is sizably reduced in both the blades of the impeller and the rails of the baffle.
  • the blade according to my present invention has a narrow waist and outer blade portions of parallelogrammatic cross section.
  • the blade is adapted to be reversed once one said is worn down. To do this it is mounted between two elongated keys in what amounts to a groove on the impeller.
  • the trailing edge of the blade is buttressed by a resilient strip so that a slight amount of the strain the blade is subjected to can be absorbed here. This prevents to a remarkable extend, the danger of breaking of the blade, even if some relatively uncrushable material is fed into the crusher.
  • the baffle is also provided with similar blades. These blades face back into the directions of rotation of the impeller at the same angle as the impeller blades.
  • the blades which have been used on both sides in the impeller are employed here in the bafile. This allows each blades to be fully consumed and sizably reduces running costs.
  • FIG. 1 is a cross section through part of an impeller having a blade arrangement in accordance with my invention.
  • FIG. 2 is a horizontal section through a rotary crusher according to my invention, with the impeller-blade arrangement shown in FIG. 1.
  • a rotary crusher has a housing 16 with a pivotal top 16b and a downstream wall 16a.
  • Rock or the like to be crushed is loaded into the mouth 23 where it is retained temporarily by a thick rubber curtain 22a and a chain curtain 22b. Thence it is crushed, as will be more fully described below, and the final comminuted product exits through opening 24.
  • This crusher is intended to reduce rocky material into reasonably fine sandy material having a particle size of about 3 mm.
  • the input is normal rock of a degree of hardness from soft up to quite hard, and the output is an even sand.
  • the rock After passing the curtains 22a and 22b, the rock is flung by a spinning impeller 10 against a series of breaker plates 21. This effectively smashes the large fragments. Then the impeller 10 crushes them against a mill plate 14 or a baffle 13 pivoted at 12. The clearance between the orbit of the impeller and the mill plate 14 is set by a screw arrangement which pivots the baffle 13.
  • This baffle 13 consists of two arms 130 between which a plurality of rails 15 extend, with two blades 1 as will be described below.
  • FIG. 1 shows the blade arrangement on the impeller 10 in more detail.
  • the impeller 10 consists of a plurality of plates 10a (only one shown) arranged on bars 25 and rotatable with a driven shaft 11 about a horizontal axis A.
  • the plate 10a is formed with a notch 10b that makes for a sort of axial channel across the impeller 10.
  • This channel formed by the notches 10b holds one of the blades 1.
  • This has two relatively large end portions la, and 1b separated by a relatively narrow waist 10c.
  • the end In projecting from the impeller 10 has a leading face ld, a trailing face 1f, and an outer face 1e.
  • the faces ldtand l f lie parallel to each other at 32 to a radius R from the axis A.
  • the face le lies tangential to the orbit o.
  • the waist 10 is gripped between two keys 3 and 4 held by screws 5 and 6.
  • a strip 2 of black rubber lies behind a flank 1a, of the blade 1, relative to the rotation directions, and cushions it.
  • each parallelogrammatic blade body extend orthogonally at right angles) to the trailing faces and terminate at flanks lc,defining the waist and parallel to the radius R.
  • Flanks la constitute the supporting shoulders of the blade and lie diagonally opposite the forward cutting edge (defined between the leading face 1d and face 1e) Only two screws 5 are required in the impeller for each blade; they serve simply to hold the key 4 up when the blade 1 is being changed.
  • a bolt 7 holds a plate 9 which protects the impeller 10 while the bolt 6 passes through a plate 8 for the same purpose.
  • a plate 26 held by the plate 9 acts upon a lip 3a of the key 3 as the plate 50 on a lip 40 of the key 4 to hold the keys 3 and 4 with the blade 1 in the notch 10b. It is also worth noting that the blade 1 can move with the keys 3 and 4 toward the axis A due to the depth of the notch 10b.
  • the blades 1 When thoroughly worn down or one end is worn down, the blades 1 are merely pulled axially out from between the keys 3 and 4, centrifugal force holding them firmly in place during operation of the crusher. Once each blade 1 has been used on both ends 1a and 1b, it is slid into the arms 13a of the baffle 13 and fully used up there. The plates 8 and 9 must also be periodically replaced.
  • Such an arrangement of blades 1 on both the impeller 10 and on the baffle 13 causes the blades to sharpen each other. This is due mainly to the fact that the blades on the impeller 10 are raked forward into the direction of rotation, while those on the baffle 13 are raked back.
  • a rotary impact crusher comprising an impeller rotatable about a horizontal axis and provided with at least one axially extending impeller blade projecting outwardly of said impeller, and a cylindrically concave baffle defining a clearance with the blade orbit, said blade having, in the rotational direction, a leading face inclined into the direction of rotation at an angle of 25 to 45 to a radius running from said axis to said blade, said baffle having at least one such blade having one such leading face inclined counter to the direction of rotation of the impeller at an angle of 25 to 45 to a radius running from said axis to said blade of said battle.
  • impeller blade has a longitudinally extending narrow waist between two relatively large outer portions each having said leading, trailing and outer face, whereby said impeller blade can be reversed in said channel and is adapted to be clamped at said waist.
  • said crusher further comprises a housing having a sidewall on the ascending side of said impeller with respect to the rotational direction thereof, a bottom wall, and an upright partition extending partially upwardly in said housing from said bottom wall and spaced from said sidewall and defining a particleretaining compartment with said sidewall and defining a particle-retaining compartment with said sidewall adapted to accumulate said particles and form a relatively thick lining for said sidewall therefrom.
  • a rotary impact mill comprising a housing having an inlet for material to be crushed; an impeller rotatable about a horizontal axis; a plurality of angularly spaced axially extending blades mounted in said impeller and projecting beyond the periphery thereof, said blades describing a circular orbit centered on said axis; a plurality of braker plates spaced apart above said impeller and intercepting the material entrained thereby to comminute the same by impact forces; and an arcuate baffle extending beneath said impeller and along an arc segment, said baffle being provided with a mill plate cooperating with said impeller blades for crushing said material and with at least one baffle blade extending parallel to the axis and projecting in the direction of said orbit, said impeller blades having parallel leading and trailing faces inclined into the direction of rotation and said baffle blade having parallel leading and trailing faces inclined counter to the direction of rotation of said impeller, said faces including acute angles between 25 and 45 with a plane of the axis along a radius

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Crushing And Grinding (AREA)
US806556A 1968-03-14 1969-03-12 Rotary impact crusher Expired - Lifetime US3608841A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT252068A AT289522B (de) 1968-03-14 1968-03-14 Prallmühle

Publications (1)

Publication Number Publication Date
US3608841A true US3608841A (en) 1971-09-28

Family

ID=3535746

Family Applications (1)

Application Number Title Priority Date Filing Date
US806556A Expired - Lifetime US3608841A (en) 1968-03-14 1969-03-12 Rotary impact crusher

Country Status (11)

Country Link
US (1) US3608841A (en))
JP (1) JPS5310301B1 (en))
AT (1) AT289522B (en))
CH (1) CH505649A (en))
ES (1) ES364737A1 (en))
FI (1) FI52283C (en))
GB (1) GB1249738A (en))
NO (1) NO124149B (en))
RO (1) RO54563A (en))
SE (1) SE346702B (en))
YU (1) YU31257B (en))

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3813048A (en) * 1971-07-02 1974-05-28 Condux Werk Cutting mill
US3857519A (en) * 1972-06-10 1974-12-31 Lindemann Maschfab Gmbh Hammer breaker for breaking-up bulky refuse material
US3929296A (en) * 1973-04-07 1975-12-30 Hans Stoeber Striking tool
US4047670A (en) * 1973-10-25 1977-09-13 Aktiebolaget Iggesunds Bruk Knife device for a chopper
US4172561A (en) * 1977-05-26 1979-10-30 Dresser Europe S.A. Mineral lump breaker
US4273294A (en) * 1979-03-15 1981-06-16 Air Products And Chemicals, Inc. Method and apparatus for cryogenic grinding
US4373678A (en) * 1980-06-30 1983-02-15 Reitter Guenther W Rotary impact crusher having a continuous rotary circumference
US4597538A (en) * 1984-05-16 1986-07-01 Getz Roland A Asphalt comminuting apparatus
US4714207A (en) * 1985-07-17 1987-12-22 Fried. Krupp Gesellschaft Mit Beschrankter Haftung Impact bar for a comminuting rotor
AU575490B2 (en) * 1985-07-17 1988-07-28 Hermann Schrodl Impact bar for a comminuting rotor
DE4234518A1 (de) * 1991-10-17 1993-04-22 James H Page Materialmahlvorrichtung
US5320292A (en) * 1992-11-06 1994-06-14 Smith Roger G Mounting for replaceable hammers in impact crusher
US5503339A (en) * 1993-04-20 1996-04-02 Doppstadt; Werner Comminuting machine with comb-like further comminuting structure
US5829692A (en) * 1995-02-21 1998-11-03 Wildcat Services Inc. Modularly tiered clear-trajectory impact comminuter and modular comminution chamber
US5881959A (en) * 1995-05-04 1999-03-16 Cmi Corporation Materials grinder with infeed conveyor and anvil
US5887809A (en) * 1995-02-21 1999-03-30 Wildcat Services Inc. Clear-trajectory rotary-driven impact comminuter
US20040061009A1 (en) * 2002-01-28 2004-04-01 Rosser F. F. Scrap fragmenting apparatus
US20060055186A1 (en) * 2004-08-31 2006-03-16 Johnson George F Material crusher
US20090261188A1 (en) * 2008-04-16 2009-10-22 Iafrate John A Roller Jaw Crusher System And Method
US7651559B2 (en) 2005-11-04 2010-01-26 Franklin Industrial Minerals Mineral composition
US20150122920A1 (en) * 2012-06-20 2015-05-07 Sandvik Intellectual Property Ab Method of feeding material to a horizontal shaft impact crusher, and a crushing device
IT201600094638A1 (it) * 2016-09-21 2018-03-21 Seppi M Ag S P A Utensile in un portautensile per trinciatrici/fresatrici
US20190015838A1 (en) * 2017-06-16 2019-01-17 Keestrack N.V. Impact bar
WO2021217197A1 (en) * 2020-04-30 2021-11-04 Vectis Pty Ltd as trustee for JJB Trust A grinding mill rotor
US11446674B2 (en) * 2017-11-23 2022-09-20 Keestrack N.V. Blow bar
US20230037242A1 (en) * 2020-01-15 2023-02-02 Jdc Corporation Rotary Crushing Apparatus

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT372020B (de) * 1981-04-17 1983-08-25 Schroedl Hermann Prallbrecher
CN104841521A (zh) * 2015-04-22 2015-08-19 曲阜金鑫矿山机械有限公司 环锤式破碎机的防物料外溅装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1189471A (en) * 1914-01-12 1916-07-04 John D Ochterbeck Crushing-machine.
US2308578A (en) * 1940-03-02 1943-01-19 Weber Bros Metal Works Hammer mill
US2585943A (en) * 1943-03-01 1952-02-19 Harriet F Derrick Impact rotor for stone breakers
US2647695A (en) * 1950-11-01 1953-08-04 Riley Stoker Corp Rotor comprising pivoted hammer provided with armored outer portion and plate-shielded inner portion

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1189471A (en) * 1914-01-12 1916-07-04 John D Ochterbeck Crushing-machine.
US2308578A (en) * 1940-03-02 1943-01-19 Weber Bros Metal Works Hammer mill
US2585943A (en) * 1943-03-01 1952-02-19 Harriet F Derrick Impact rotor for stone breakers
US2647695A (en) * 1950-11-01 1953-08-04 Riley Stoker Corp Rotor comprising pivoted hammer provided with armored outer portion and plate-shielded inner portion

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3813048A (en) * 1971-07-02 1974-05-28 Condux Werk Cutting mill
US3857519A (en) * 1972-06-10 1974-12-31 Lindemann Maschfab Gmbh Hammer breaker for breaking-up bulky refuse material
US3929296A (en) * 1973-04-07 1975-12-30 Hans Stoeber Striking tool
US4047670A (en) * 1973-10-25 1977-09-13 Aktiebolaget Iggesunds Bruk Knife device for a chopper
US4172561A (en) * 1977-05-26 1979-10-30 Dresser Europe S.A. Mineral lump breaker
US4273294A (en) * 1979-03-15 1981-06-16 Air Products And Chemicals, Inc. Method and apparatus for cryogenic grinding
US4373678A (en) * 1980-06-30 1983-02-15 Reitter Guenther W Rotary impact crusher having a continuous rotary circumference
US4597538A (en) * 1984-05-16 1986-07-01 Getz Roland A Asphalt comminuting apparatus
US4714207A (en) * 1985-07-17 1987-12-22 Fried. Krupp Gesellschaft Mit Beschrankter Haftung Impact bar for a comminuting rotor
AU575490B2 (en) * 1985-07-17 1988-07-28 Hermann Schrodl Impact bar for a comminuting rotor
DE4234518A1 (de) * 1991-10-17 1993-04-22 James H Page Materialmahlvorrichtung
DE4234518C2 (de) * 1991-10-17 1999-11-04 James H Page Materialmahlvorrichtung mit einer Materialmahltrommel und Scherstäben
US5320292A (en) * 1992-11-06 1994-06-14 Smith Roger G Mounting for replaceable hammers in impact crusher
US5503339A (en) * 1993-04-20 1996-04-02 Doppstadt; Werner Comminuting machine with comb-like further comminuting structure
US5829692A (en) * 1995-02-21 1998-11-03 Wildcat Services Inc. Modularly tiered clear-trajectory impact comminuter and modular comminution chamber
US5887809A (en) * 1995-02-21 1999-03-30 Wildcat Services Inc. Clear-trajectory rotary-driven impact comminuter
US5881959A (en) * 1995-05-04 1999-03-16 Cmi Corporation Materials grinder with infeed conveyor and anvil
US20050145734A1 (en) * 2002-01-28 2005-07-07 Uxb International, Inc. Scrap fragmenting apparatus
US20040061009A1 (en) * 2002-01-28 2004-04-01 Rosser F. F. Scrap fragmenting apparatus
US20060055186A1 (en) * 2004-08-31 2006-03-16 Johnson George F Material crusher
US7360725B2 (en) * 2004-08-31 2008-04-22 Johnson Industries, Inc. Material crusher
US7651559B2 (en) 2005-11-04 2010-01-26 Franklin Industrial Minerals Mineral composition
US20090261188A1 (en) * 2008-04-16 2009-10-22 Iafrate John A Roller Jaw Crusher System And Method
US8702024B2 (en) 2008-04-16 2014-04-22 Apopka Recycling, Inc. Roller jaw crusher system and method
US20150122920A1 (en) * 2012-06-20 2015-05-07 Sandvik Intellectual Property Ab Method of feeding material to a horizontal shaft impact crusher, and a crushing device
US10751724B2 (en) * 2012-06-20 2020-08-25 Sandvik Intellectual Property Ab Method of feeding material to a horizontal shaft impact crusher, and a crushing device
WO2018054733A1 (de) * 2016-09-21 2018-03-29 Seppi M. Spa Ag Werkzeug an einem werkzeugträger für fräsen und zerkleinerer
IT201600094638A1 (it) * 2016-09-21 2018-03-21 Seppi M Ag S P A Utensile in un portautensile per trinciatrici/fresatrici
RU2732491C1 (ru) * 2016-09-21 2020-09-17 Сеппи М. Спа Аг Инструмент в держателе инструмента для мульчеров/измельчителей
US11122723B2 (en) 2016-09-21 2021-09-21 Seppi M. Spa Ag Tool on a tool carrier for tilling and comminuting
US20190015838A1 (en) * 2017-06-16 2019-01-17 Keestrack N.V. Impact bar
US10792664B2 (en) * 2017-06-16 2020-10-06 Keestrack N.V. Impact bar
US11446674B2 (en) * 2017-11-23 2022-09-20 Keestrack N.V. Blow bar
US20230037242A1 (en) * 2020-01-15 2023-02-02 Jdc Corporation Rotary Crushing Apparatus
WO2021217197A1 (en) * 2020-04-30 2021-11-04 Vectis Pty Ltd as trustee for JJB Trust A grinding mill rotor
CN115461154A (zh) * 2020-04-30 2022-12-09 维克蒂斯私人有限公司(作为Jjb信托的受托人) 一种研磨机转子
CN115461154B (zh) * 2020-04-30 2024-05-31 维克蒂斯私人有限公司(作为Jjb信托的受托人) 一种研磨机转子及其用途、研磨机

Also Published As

Publication number Publication date
CH505649A (de) 1971-04-15
AT289522B (de) 1971-04-26
ES364737A1 (es) 1970-12-16
FI52283B (en)) 1977-05-02
FI52283C (fi) 1977-08-10
NO124149B (en)) 1972-03-13
YU31257B (en) 1973-02-28
GB1249738A (en) 1971-10-13
JPS5310301B1 (en)) 1978-04-12
DE1800622B1 (de) 1970-11-12
SE346702B (en)) 1972-07-17
RO54563A (en)) 1973-02-17

Similar Documents

Publication Publication Date Title
US3608841A (en) Rotary impact crusher
US4557421A (en) Paper disintegrator and method of operating same
US3887141A (en) Impact-attrition mill utilizing air flow
US3480214A (en) Rotary disintegrator
US2392958A (en) Mill
US4373678A (en) Rotary impact crusher having a continuous rotary circumference
US2486421A (en) Double impeller impact breaker
US2919864A (en) Centrifugal pulverizer
US5165611A (en) Wood size reduction apparatus
US2141664A (en) Grinder
US2889119A (en) Slinging impact breakers
US3455517A (en) Rotary impact crusher
US3096035A (en) Rotary impact crusher
US3157366A (en) Pulverizer
US1418735A (en) Fine grinder
US3204882A (en) Rock crusher
KR101797087B1 (ko) 고춧가루 뭉침 방지구조를 갖는 이단 고추 분쇄장치
US3595290A (en) Apparatus for comminuting grain
US3258211A (en) Crusher apparatus
US1902721A (en) Rock crusher and separator
US4577806A (en) Impeller assembly for an impact crusher
US4579290A (en) Convertible centrifugal rock crusher
US2834553A (en) Hammer rotor type bradford crusher
US2192606A (en) Impact crusher
US2386021A (en) Screen for hammer type feed grinders