US3843063A - Shredding and defiberizing machine - Google Patents

Shredding and defiberizing machine Download PDF

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Publication number
US3843063A
US3843063A US00330081A US33008173A US3843063A US 3843063 A US3843063 A US 3843063A US 00330081 A US00330081 A US 00330081A US 33008173 A US33008173 A US 33008173A US 3843063 A US3843063 A US 3843063A
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United States
Prior art keywords
blades
rotor
bedplate
blade
hub
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
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US00330081A
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English (en)
Inventor
R Honeyman
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.)
Voith Morden Inc
Original Assignee
Morden Machine Co
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 Morden Machine Co filed Critical Morden Machine Co
Priority to US00330081A priority Critical patent/US3843063A/en
Priority to JP779974A priority patent/JPS548762B2/ja
Priority to SE7401089A priority patent/SE405992B/xx
Priority to GB382474A priority patent/GB1449067A/en
Priority to FR7402800A priority patent/FR2216391B1/fr
Priority to BR638/74A priority patent/BR7400638D0/pt
Priority to CA191,789A priority patent/CA1000983A/en
Priority to DE2405702A priority patent/DE2405702C3/de
Application granted granted Critical
Publication of US3843063A publication Critical patent/US3843063A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/34—Kneading or mixing; Pulpers
    • D21B1/345—Pulpers
    • D21B1/347—Rotor assemblies

Definitions

  • machine including a substantially dome-shaped rotor. having outwardly extending blades moving over a cooperating stationary bedplate and method of construction thereof, the blades being organized into groups having varying heights so as to achieve optimum circulation or horsepower utilization or both as a function of consistency.
  • the rotor assembly which moves over the face of the stationary cooperating bedplate, has a plurality of blades extending the same radial distance from the rotor hub.
  • the bottom faces of the blades have the same shape and surface area, decreasing in width from the hub to the blade tip.
  • the top surfaces of the blades are flat and are of identical width, but, although they leave the hub at approximately the same radial distance from the axis of rotation of the rotor, they do not all have the same slope with respect to the bedplate and consequently the blades vary in height being arranged in more or less symmetrical order around the hub, the height and number of the corresponding blades depending on the general nature of the material being treated and the operating requirements.
  • each blade is substantially perpendicular to the plane of the bedplate and extends obliquely away from the direction of rotation of the rotor.
  • the trailing face of each blade has a concave downward slope from the rear edge of the top face.
  • the bottom face of the blades are identically grooved to form bars parallel to the leading face of the blade and the grooves and bars extend in under the periphery of the hub preventing the possibility of any material on the bedplate escaping treatment by getting in under the hub. This feature also will prevent extraneous trash material from collecting inwardly beneath the rotor hub.
  • the stationary bedplate for batch operation usually will have radiallyextending bars. For continuous operation the bedplate will have suitable perforations, or radial bars with perforations in the grooves, all of which are well-known.
  • the bedplate is perforated and extends over an annular recirculation chamber which has inwardly-located discharge ports leading upwardly to the underside of the rotor hub with the result that a portion of the semidefiberized material which is forced down through the perforations in the bedplatewill be drawn up into the low pressure zone beneath the hub and subjected to further defiberizing action without again traveling the complete path of the material being circulated throughout the tank.
  • FIGS. 3, 4 and 5 are an end elevation and crossseetional elevations of one of the higher blades on the rotor, taken on lines 3-3, 4-4 and 55, respectively of FIG. 1 and drawn to a considerably enlarged scale;
  • FIG-6 is a fragmentary bottom view of the rotor taken on the line indicated at 6-6 in FIG. 2, but drawn to the same scale as FIG. 1;
  • FIG. 7 is a fragmentary top plan view of a modified form of rotor, drawn to the same scale as FIG. 1, but showing a portion of a typical cooperating stationary bedplate employing small perforations;
  • FIG. 8 is sectional elevation of the rotor with the bedplate of FIG. 7 taken along the axis of the rotor and thus along the line indicated at 8-8 in'FIG. 7, drawn to the same scale as FIG. 2, and showing also the discharging chamber beneath the perforated bedplate when the machine is mounted in the tank for continuous operation as opposed to batch operation;
  • FIG. 9 is a sectional elevation of the rotor and bedplate showing the machine installed in the tank for a modified operation embodying recirculation of portions of the semi-treated material for batch operations;
  • FIG. 10 is a top plan view of the bedplate used in the modified operation illustrated in FIG. 9 and taken on line 10-10 of FIG. 9;
  • FIG. 11 is a chart of performance characteristics (speed versus power) of different kinds of rotors.
  • FIG. 12 is a chart similar to FIG. 11 but relating speed to circulation.
  • FIGS. 1-6 The machine shown there includes a rotor, indicated in general by R, which operates in conjunction with a cooperating, stationary bedplate.
  • the rotor has a hollow, round, substantially dome-shaped hub 10 which is sewhich rests on the peripheral portion of the mounting member flange 11 and is firmly secured thereto by a series of recessed screws 14.
  • the hub may be adjusted with respect to the mounting member when desired by the interposition of shims 15 between the hub 10 and the flange 11' of the mounting member for a reason later apparent.
  • the hub 10 of the rotor R is formed with plurality of integral blades 16 starting on the hub at approximately the same radial distance from the axis of rotor rotation and extending the same distance beyond the periphery of the rotor hub.
  • the bottom faces 16 of these blades all extend in the same plane perpendicular to the axis of rotation and in a plane parallel to the plane of the stationary bedplate later mentioned. While the blades 16 are of various heights, as presently explained, the bottom faces 16' are all identical in size and shape (see FIG. 6) and decrease in width from the hub to their outer tips to form a web behind the leading face of each blade.
  • the bottom faces 16' and the defibering surface of the bedplate may be a flat surface or a surface of revolution as the frustro-conical surface described in US. Pat. No. 2,858,990. However, it has been found more advantageous to provide the flat surface herein defined.
  • each blade extends obliquely away from the direction of rotation of the rotor. Also, the leading face of each blade is substantially perpendicular to the common plane of the bedplate.
  • the bottom faces 16' of the rotor blades extend in under the periphery of the rotor hub designated 18 in FIGS. 2 and 6. It is understood that the rotor can be manufactured for rotation in the opposite direction of that shown by reversing the design of rotor blades.
  • each of the blades is formed preferably with equally spaced bars 19 (FIG. 6) of identical width, extending parallel to the leading face of the blade.
  • the bars extend from the outer end of the blade inwardly under the hub. As illustrated, these may have a common inner termination.
  • the bottom face of each blade has four such bars, the bars being of varying length.
  • the inner end of the last and shortest bar on the bottom face of each blade terminates close to the inner end of the first and longest bar on the bottom of the next succeeding blade.
  • This bedplate is secured by screws to a base plate 21 of similar size, which in turn is secured in a corresponding recess in the wall of the tank 23 in which the treatment of the pulp material takes place.
  • the peripheral portion of the bedplate 20, starting from inside the hub periphery, is grooved so as to form a series of bars 22 extending radially out to the periphery of the bedplate and thus cooperating with the bars on the bottom faces of the rotor blades to produce the desired defiberizing action on the material passing between the opposed sets of bars.
  • the amount of clearance between the opposed sets of bars can be adjusted as desired, by means of the interposed shims 15 (FIG. 2) between the rotor hub 10 and the flange 11' of the rotor mounting member 11 previously mentioned. It is appreciated that bedplate bars may assume other patterns than radial.
  • the bottom face of the bottom flange 11' of the mounting member for the rotor hub also is preferably formed with obliquely-extending bars 11a (FIG. 6) to engage and throw out any material which might possibly enter into this space.
  • the blades are not all the same height.
  • the higher blades act to facilitate and hasten the breaking up of large pieces or slabs of material encountered by the retor.
  • too large a number of higher blades would negate the destructive tearing effect of the proportionately fewer blades, on large masses of material and, also, result in uneconomical power consumption.
  • too many blades in total will tend to obstruct the flow of partially treated material into the defiberingzone at the surface of the bedplate and also can restrict materially the pumping or circulating capacity of the rotor.
  • the rotor is shown with a total of twelve blades which are of three different heights, as indicated somewhat diagrammatically in FIG. 2, the highest blades being indicated by the reference a, intermediate blades by the reference b, and the low blades by the reference c.
  • the rotor is made with twelve blades, it is possible to provide four blades of the three heights a, b, and c symmetrically arranged, or, depending upon the nature of the material being treated, it is possible, as another example, to have three of the high blades 0, with each followed by two of the intermediate blades b, and one low blade c symmetrically arranged.
  • the selection of the proper arrangement and height of the blades with respect to the particular nature of the material being treated and the proper rotor speed make possible the most efficient and economical power consumption.
  • each rotor blade is preferably flat and substantially perpendicular to the plane of the bedplate, extending out obliquely in a direction away from the direction of rotation.
  • the top face of each blade is flat and narrow with parallel edges, the slope of the top face with respect to the plane of the bedplate depending upon the height of the blade at its tip.
  • the trailing face of each blade slopes downwardly toward the succeeding blade, which downward slope becomes more and more concave inwardly along the blade, and this concave trailing face aids in feeding the material down to the bedplate and to the leading face of the succeeding blade.
  • FIGS. 3, 4 and 5 indicate an end elevation, an intermediate crosssection, and a cross-section taken further inwardly respectively of one of the high blades of the rotor.
  • FIGS. 7 and 8 of the rotor R is shown in combination with a bedplate 24 which, instead of having radial bars to cooperate with the bars on the bottom faces of the rotor blades, is perforated in the annular area over which the rotor blades pass, and extending beyond this area when additional capacity is required.
  • An annular discharging passageway 25 (FIG. 8), provided in the tank housing beneath the annular perforated area of the bedplate, leads down into an annular chamber 26 which preferably has a sloping wall leading to a controlled outlet pipe 27.
  • FIGS. 9 and 10 illustrate a modification of the machine for batch operations in which semi-defiberized material receives additional defiberizing action without having again to travel the entire circulation pattern of the material in the tank surrounding the rotor.
  • the bedplate 28 is formed with perforations, or with radial bars 29 with perforations 30 in the grooves between the bars, (in the annular path over which the rotor blades pass).
  • An outer annular chamber 31 beneath the annular perforated portion of the bedplate is connected with an inner annular chamber 32.
  • the bedplate 28 is also provided with relatively large openings 33 above the inner chamber 32, which openings lead upward to the under side of the mounting member flange 11' of the rotor.
  • the material being treated is forced downwardly through the perforated bedplate by the pressure waves preceding the advancing rotor blades and into chamber 31 thence flowing into chamber 32 and up into the low pressure zone beneath the rotor through ports 33. There it re-enters the defibering zone and is carried outwardly again by centrifugal action of the rotor blades, being subject in this way to additional defiberizing action beneath the rotor blades.
  • FIG. 11 is a graph or chart of performance characteristics of certain rotors. More specifically, the numeral 363 designates the plot relating speed in rpm as a function of brake horsepower for a rotor having 12 blades of differ ent sizes, provided in three groups. This is illustrated in part in FIG. 7 where it will be noted that there are three high blades 0, six intermediate height blades b and three low blades c. In FIG. 12, the performance characteristic of the surface circulation rate in fpm is related to the speed of the rotor and the plot relating these for the embodiment of the invention seen in FIG. 7 is also designaged 363.
  • FIGS. 11 and 12 there is seen two other plots relating performance characteristics. These plots are designated 306 and 309 and relate, respectively, to a 9 blade rotor and a 12 blade rotor, the 9 blade rotor, for example having three high blades a and six low blades 0, arranged with two low blades following each high blade.
  • the 12 blade rotor has 3 low blades following each high blade.
  • the 9 blade rotor may be developed from the same pattern as the 12 blade rotor but eliminating one of the low blades after each high blade. In such a case the blade spacing is not equal. However the rotor is still balanced.
  • the plots 114 relate to the performance characteristics of the commercial embodiment of US. Pat. No. 2,858,990, the series FGVl 14 machine of the assignee Modern Machines Company of Portland, Oregon of the aforesaid patent.
  • the invention provides an advantageous method by which circulation rates can be increased without increasing power.
  • FIGS. 11 and 12 are not single line curves but rather are ranges or bands based upon a number of tests.
  • the speed and power figures are correlated to a 27 inch diameter rotor as extrapolated from laboratory models this being considered a proven approach in this field.
  • the tests were correlated to a given size commercial pulping unit installed in a maximum size tank. All tests treated stock of identical specifications at 6 percent A.D. consistency. Data was obtained using a dynomatic variable speed drive with power corrected by formula to actual brake horsepower output and correlated to commercial experience. The data is typical of an extensive program numbering over tests.
  • the plots were bracketed to show the range or band that the respective rotors fall into.
  • the circulation curves will showa greater range, primarily due to air entrainment at higher speeds, and also to minor uncontrollable variables in stock viscosity.
  • the averages or mid-points of the range of curves was selected.
  • the 306 rotor is designed for medium or large tanks at low consistency, or small tanks at high consistency.
  • the 309 rotor is for general purpose, or intermediate applications.
  • the 363 rotor is for high consistency, and, or large tank applications. Atequal or better defibering efficiencies, as rated by horsepower per day, per ton of stock, the new series rotors show clear advantages over the FGV-1l4 series.
  • the sum of the intermediate and lowheight blades is between 2 and I the b blades 2 /2 inches and the blades 1 /z inches.
  • the heights, size and configurations of the rotor blades, in combination with any of the bedplates mentioned, provide several advantages. They enable the material or slurry in the tank to be circulated at an improved level of efficiency relative to power usage.
  • the high blades perform the necessary, primary breakdown of the larger pieces or slabs of material enhanced by the leading faces of all the blades providing an abrupt oblique angle of attack (relative to rotation) on the material encountered.
  • the hazard of having any tramp metal or other foreign material reaching the defibering zone is practically eliminated when incorporating rotor blades that are substantially perpendicular to a fiat bedplate.
  • I include faces that slope slightly rearwardly but not significantly forwardly;
  • the trailing face of each blade acts to feed the material into the space ahead of the succeeding blade, but the blade contours are also so designed as to prevent any blinding or plugging of the rotor by the material encountered, and the bottom faces of the blades provide proportionately large, working or defiberizing surfaces acting in conjunction with any of the stationary bedplates illustrated to accomplish the desired defiberizing results efficiently and with an economical consumption of power.
  • a machine for shredding and defiberizingpapermaking material including a rotor, means for rotating said rotor about an axis, a stationary bedplate formed into a surface of revolution about said axis of rotation and defining a plurality of shear edges providing a generally planar defibering zone, a substantially domeshaped hub on said rotor, a plurality of blades extending from said hub, each blade having a predetermined height and including a substantially flat forward work surface extending perpendicular to said bedplate and forming an oblique angle with a radius of said rotor away from the directionof rotation, the trailing surface of each blade further defining a concave downward slope along a portion thereof from the rear edge of top face for drawing material downinto an intermediate location on the working face of a succeeding blade, the bottom faces of said blades extending in a surface parallel to and spaced slightly from said bedplate, and defining a plurality of bars each providing a straight shearing edge, said blades including a first set of blades
  • each blade includes a trailing web portion for carrying said bars, the concavity of said trailing surface of said blades increasing in a direction inwardly along each blade, the curvature of the trailing surface of each blade extending out along its associated web portion.
  • said second set of blades includes blades of at least two different heights other than the height of said first set of blades.
  • a machine for shredding and defiberizing papermaking material including a rotor, means for rotating said rotor about an axis, a stationary bedplate formed into surface of revolution about said axis of rotation and defining a plurality of shear edges providing a generally planar defigering zone, a substantially domeshaped hub on said rotor, a plurality of blades extending from said hub, each bladehaving a predetermined height and including a substantially flat forward work surface extending perpendicular to said bedplate and forming an oblique angle with a radius of said rotor away from the direction of rotation, the trailing surface of each blade further defining a concave downward slope along a portion thereof from the rear edge of the top for drawing material down into an intermediate location on the working face of a succeeding blade, the bottom faces of said blades extending in a surface parallel to and spaced slightly from said bedplate and defining a plurality of bars each providing a straight shearing edge, said blades including a first set of blades of
  • each blade includes a trailing web portion for carrying said bars, the concavity of said trailing surfaces of said blades increasing in a direction inwardly along each blade and extending out along an associated web portion.
  • a machine for shredding and defiberizing papermaking material including a rotor, means for rotating said rotor about an axis, a stationary bedplate extending in a plane generally perpendicular to said axis of rotation, a substantially dome-shaped hub on said rotor, a first plurality of equally spaced blades having their top edges starting from said hub at approximately raannular chamber inwardly of a the defibering zone, whereby material to be treated passing through said bedplate from said defibering zone into said first annular chamber is forced into said second annular chamber and thence upwardly through said enlarged openings to be recirculated through said defibering zone.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Crushing And Pulverization Processes (AREA)
US00330081A 1973-02-06 1973-02-06 Shredding and defiberizing machine Expired - Lifetime US3843063A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US00330081A US3843063A (en) 1973-02-06 1973-02-06 Shredding and defiberizing machine
JP779974A JPS548762B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-02-06 1974-01-16
GB382474A GB1449067A (en) 1973-02-06 1974-01-28 Shredding and defiberizing machine and method
SE7401089A SE405992B (sv) 1973-02-06 1974-01-28 Maskin for sonderdelning och defibrering av material for framstellning av papper
FR7402800A FR2216391B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-02-06 1974-01-29
BR638/74A BR7400638D0 (pt) 1973-02-06 1974-01-30 Aperfeicoamento em processo de construcao de um rotor para uma maquina de picar e desfibrar, e aperfeicoamento na maquina
CA191,789A CA1000983A (en) 1973-02-06 1974-02-05 Shredding and defiberizing machine and method
DE2405702A DE2405702C3 (de) 1973-02-06 1974-02-06 Stofflöser zum Herstellen einer pumpfähigen Suspension aus trockenen Papierrohstoffen

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Application Number Priority Date Filing Date Title
US00330081A US3843063A (en) 1973-02-06 1973-02-06 Shredding and defiberizing machine

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US3843063A true US3843063A (en) 1974-10-22

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US00330081A Expired - Lifetime US3843063A (en) 1973-02-06 1973-02-06 Shredding and defiberizing machine

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US (1) US3843063A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS548762B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
BR (1) BR7400638D0 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CA (1) CA1000983A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2405702C3 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2216391B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1449067A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
SE (1) SE405992B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4109872A (en) * 1977-07-29 1978-08-29 The Black Clawson Company Pulping apparatus for liquid slurry stock
US5918822A (en) * 1998-01-26 1999-07-06 Sternby; Arthur J. Channeled pulp rotor
EP1347093A1 (en) * 2002-03-19 2003-09-24 Comer SpA Propeller for stirring solid-in-liquid suspensions in a treatment tank
US20050039615A1 (en) * 2001-10-18 2005-02-24 Chupka David E Extraction bedplate with laser or water jet cut apertures
US20070012892A1 (en) * 2005-07-12 2007-01-18 Chung-Chih Huang Gas control knob that is operated manually or automatically
WO2009153384A1 (en) * 2008-06-16 2009-12-23 Tampulping Oy A pulper treating fiber mass
US20100086410A1 (en) * 2008-10-08 2010-04-08 Sykora Anthony C Mixing impeller
CN102941147A (zh) * 2012-12-05 2013-02-27 王海清 立式复合多级破碎机
US20130270375A1 (en) * 2009-06-23 2013-10-17 Zoeller Pump Company, Llc Grinder pump basin system
US11161121B2 (en) 2019-05-10 2021-11-02 Jung Pumpen Gmbh Cutting blade assembly
US11560894B2 (en) 2016-04-26 2023-01-24 Pentair Flow Technologies, Llc Cutting assembly for a chopper pump
US11655821B2 (en) 2013-03-15 2023-05-23 Pentair Flow Technologies, Llc Cutting blade assembly

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53144901U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1977-04-12 1978-11-15
DE102008029043A1 (de) * 2008-06-18 2009-12-24 Voith Patent Gmbh Stoffauflöser

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4109872A (en) * 1977-07-29 1978-08-29 The Black Clawson Company Pulping apparatus for liquid slurry stock
US5918822A (en) * 1998-01-26 1999-07-06 Sternby; Arthur J. Channeled pulp rotor
US20050039615A1 (en) * 2001-10-18 2005-02-24 Chupka David E Extraction bedplate with laser or water jet cut apertures
US20070245907A1 (en) * 2001-10-18 2007-10-25 Kadant Black Clawson Inc. Extraction bedplate with laser or water jet cut apertures
US7628890B2 (en) 2001-10-18 2009-12-08 Kadant Black Clawson Inc. Extraction bedplate with laser or water jet cut apertures
US8172985B2 (en) 2001-10-18 2012-05-08 Kadant Black Clawson Inc. Extraction bedplate with laser or water jet cut apertures
EP1347093A1 (en) * 2002-03-19 2003-09-24 Comer SpA Propeller for stirring solid-in-liquid suspensions in a treatment tank
US20040008574A1 (en) * 2002-03-19 2004-01-15 Franco Aver Propeller for stirring solid-in-liquid suspensions in a treatment tank
US20070012892A1 (en) * 2005-07-12 2007-01-18 Chung-Chih Huang Gas control knob that is operated manually or automatically
WO2009153384A1 (en) * 2008-06-16 2009-12-23 Tampulping Oy A pulper treating fiber mass
WO2010042955A1 (en) * 2008-10-08 2010-04-15 Glv Management Hungary Kft. A mixing impeller
US20100086410A1 (en) * 2008-10-08 2010-04-08 Sykora Anthony C Mixing impeller
US8201990B2 (en) 2008-10-08 2012-06-19 Ovivo Luxembourg S.à r.l. Mixing impeller
EP2352594A4 (en) * 2008-10-08 2014-01-15 Glv Finance Hungary Kft MIXER WHEEL
US20130270375A1 (en) * 2009-06-23 2013-10-17 Zoeller Pump Company, Llc Grinder pump basin system
US9352327B2 (en) * 2009-06-23 2016-05-31 Zoeller Pump Company, Llc Grinder pump basin system
CN102941147A (zh) * 2012-12-05 2013-02-27 王海清 立式复合多级破碎机
US11655821B2 (en) 2013-03-15 2023-05-23 Pentair Flow Technologies, Llc Cutting blade assembly
US11560894B2 (en) 2016-04-26 2023-01-24 Pentair Flow Technologies, Llc Cutting assembly for a chopper pump
US11161121B2 (en) 2019-05-10 2021-11-02 Jung Pumpen Gmbh Cutting blade assembly

Also Published As

Publication number Publication date
CA1000983A (en) 1976-12-07
JPS548762B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1979-04-18
FR2216391A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-08-30
SE405992B (sv) 1979-01-15
BR7400638D0 (pt) 1974-11-19
GB1449067A (en) 1976-09-08
DE2405702B2 (de) 1979-01-18
FR2216391B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1978-06-02
DE2405702C3 (de) 1979-09-13
JPS49116303A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-11-07
DE2405702A1 (de) 1974-08-08

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