EP0727255A1 - Désintégrateur - Google Patents

Désintégrateur Download PDF

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Publication number
EP0727255A1
EP0727255A1 EP96300984A EP96300984A EP0727255A1 EP 0727255 A1 EP0727255 A1 EP 0727255A1 EP 96300984 A EP96300984 A EP 96300984A EP 96300984 A EP96300984 A EP 96300984A EP 0727255 A1 EP0727255 A1 EP 0727255A1
Authority
EP
European Patent Office
Prior art keywords
cutters
shaft
linear velocity
shafts
peripheral linear
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.)
Withdrawn
Application number
EP96300984A
Other languages
German (de)
English (en)
Inventor
Frazer D. Wain
Steven G. Parfitt
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.)
NOV Process and Flow Technologies UK Ltd
Original Assignee
Mono Pumps Ltd
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 Mono Pumps Ltd filed Critical Mono Pumps Ltd
Publication of EP0727255A1 publication Critical patent/EP0727255A1/fr
Withdrawn legal-status Critical Current

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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
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/14—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers
    • B02C18/142—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers with two or more inter-engaging rotatable cutter assemblies
    • 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
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/16—Details
    • B02C18/24—Drives

Definitions

  • the present invention relates to macerators.
  • One form of macerator as shown, for example, in GB-A-1,569,672, includes primary and secondary parallel contra-rotating shafts, each having a plurality of alternate cutters and spacers of the same axial thickness. Each cutter has a plurality of teeth arranged at circumferentially spaced locations.
  • side rails Mounted adjacent to the cutters, on the side walls of the housing, are side rails which have radially inner surfaces which are arcuate and closely adjacent to the teeth of the cutters as they rotate. Slots may be provided in the side rails inclined at an angle with respect to the axes of the shafts, in order to increase the fluid flow rate through the macerator whilst ensuring that the solid material is cut up satisfactorily.
  • the efficiency of a macerator is determined by a number of parameters including the diameters of the cutters and spacers on the primary and secondary shafts and the rotational speed of the primary and secondary shafts.
  • the present invention provides a macerator comprising a macerating chamber, side walls of said chamber, primary and secondary parallel contra-rotating shafts extending between said side walls, a plurality of alternate cutters and spacers of the same axial thickness mounted on each of said primary and secondary shafts the cutters of the primary shaft being interleaved with those of the secondary shaft, said cutters each including at least one tooth thereon, control means for rotating the shafts, characterised in that in use the control means ensures that the peripheral linear velocity of the cutters on the primary shaft exceeds the peripheral linear velocity of the cutters on the secondary shaft and ensures that the peripheral linear velocity of the cutters on the secondary shaft exceeds the peripheral linear velocity of the spacers on the primary shaft.
  • This zone is a function of a number of parameters including :
  • C d is approximately equal to one, then there is a tendency for the paper shredder effect to occur. This is because, although a good scissoring action may occur between the teeth on the cutters of the primarily and secondary shafts, material may pass through which is simply cut into long strips.
  • the present invention advantageously provides a peripheral linear velocity difference between the corresponding cutters producing a shearing action which ensures that the material is cut up more effectively.
  • the periphery of the primary cutters has a higher speed than that of the secondary cutters, ie C d >1, but clearly the labels primary and secondary could be reversed.
  • peripheral linear velocity of a spacer on one shaft is greater than that of the opposing cutter on the other shaft, then material can be dragged past the teeth on that cutter from behind without being effectively cut by the teeth on the cutter.
  • the ratio of the peripheral linear velocity of a cutter to that of its opposing spacer is less than or equal to 1 then excessive ragging may occur because there is insufficient shear in the flow.
  • C d >1 the peripheral linear velocity of the cutters on the primary shaft will always exceed that of the spacers on the secondary shaft.
  • the ratio of the peripheral linear velocity of the cutters on the secondary shaft to the peripheral linear velocity of the spacers on the primary shaft is hereafter denoted L d .
  • the present invention provides a macerator in which L d >1 and therefore alleviates the problem of ragging.
  • the macerator preferably includes a motor for driving one of the shafts and gears connecting the two shafts for driving the other shaft at an appropriate rotational speed relative to said one shaft.
  • the macerator comprises primary and secondary parallel rotatable shafts 10, 12 extending through a macerating chamber 14 having side walls 16,18.
  • Cutters 20 are mounted on the two shafts, and spacers 22 are mounted between the cutters and are of the same axial thickness as the cutters.
  • the cutters 20 are spaced apart by the spacers 22 and these are fixedly mounted on the shafts 10, 12.
  • the cutters of one shaft are interleaved with those of the other shaft and the teeth 24 of the cutters are in close proximity to the spacers of the opposite shaft and to the side walls.
  • the side walls 16, 18 preferably have associated side rails 26, each side rail comprising a plurality of spaced ribs 28, the ribs forming there between slots 29.
  • the macerator includes control means for rotating the shafts.
  • the control means comprises a motor 30 with a gearbox 32 for driving the primary shaft 10, and gears 34, 36 connecting the two shafts for driving the secondary shaft 12 so that it contra-rotates with respect to the primary shaft 10 at an appropriate rotational speed relative to the primary shaft 10. While this arrangement is according to the preferred embodiment it will of course be understood that the motor may drive the secondary shaft 12, or that both shafts may have motors with or without gears connecting the two shafts, provided the criteria relating to the peripheral linear velocity of the cutters and spacers are met.
  • the criteria, in broad terms, are that the peripheral linear velocity of the cutters 20 on the primary shaft 10 should exceed the peripheral linear velocity of the cutters 20 on the secondary shaft 12 and that the peripheral linear velocity of the cutters 20 on the secondary shaft 12 should exceed the peripheral linear velocity of the spacers 22 on the primary shaft 10.
  • the cutters on the two shafts are all of approximately equal diameter and the spacers on the two shafts are also of approximately equal, smaller diameter.
  • the cutters In one example of a macerator the cutters have a diameter of 150 mm and the spacers have a diameter of 90 mm.
  • the primary shaft is defined as the shaft having the higher peripheral linear cutter velocity and since in this example the two shafts have cutters of the same diameter, the optimum cutting zone must lie in the region in which the rotational speed of the primary shaft exceeds the rotational speed of the secondary shaft.
  • zone of optimum cutting conditions shown in Fig. 3 is bounded by the conditions that C d should be greater than 1.14 to avoid the paper shredder effect, and L d should be greater than 1.31 to avoid excessive ragging.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)
EP96300984A 1995-02-17 1996-02-13 Désintégrateur Withdrawn EP0727255A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9503149A GB2297927A (en) 1995-02-17 1995-02-17 Macerator
GB9503149 1995-02-17

Publications (1)

Publication Number Publication Date
EP0727255A1 true EP0727255A1 (fr) 1996-08-21

Family

ID=10769788

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96300984A Withdrawn EP0727255A1 (fr) 1995-02-17 1996-02-13 Désintégrateur

Country Status (3)

Country Link
EP (1) EP0727255A1 (fr)
AU (1) AU4334896A (fr)
GB (1) GB2297927A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1084752A1 (fr) 1999-09-10 2001-03-21 Van den Eynde, Willy Dispositif de coup de matière
CN106140419A (zh) * 2016-07-25 2016-11-23 无锡福镁轻合金科技有限公司 一种具有水溶性功能的废纸粉碎机
CN111545309A (zh) * 2020-05-19 2020-08-18 江苏尚诚纺织科技有限公司 一种用于生产醋酸丁酸纤维素用高效棉花破碎机

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111359738A (zh) * 2020-03-12 2020-07-03 北京融诚信达科技发展有限公司 一种智能文件一体化回收设备
CN113441262A (zh) * 2021-08-31 2021-09-28 江苏友清生物科技有限公司 一种调味品原材料加工粉碎装置
CN113600293B (zh) * 2021-10-11 2021-12-14 如东嘉华食品机械有限公司 一种农产品谷物加工分级研磨设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1569672A (en) * 1976-02-04 1980-06-18 Chambers J Solid waste comminutor
US4723717A (en) * 1982-08-16 1988-02-09 Nelmor Co., Inc. Rotary shearing/cutting machine
US5048764A (en) * 1989-11-06 1991-09-17 Flament Gregory J Apparatus for comminuting solid waste
GB2259260A (en) * 1991-09-09 1993-03-10 Mono Pumps Ltd Macerator.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1569672A (en) * 1976-02-04 1980-06-18 Chambers J Solid waste comminutor
US4723717A (en) * 1982-08-16 1988-02-09 Nelmor Co., Inc. Rotary shearing/cutting machine
US5048764A (en) * 1989-11-06 1991-09-17 Flament Gregory J Apparatus for comminuting solid waste
GB2259260A (en) * 1991-09-09 1993-03-10 Mono Pumps Ltd Macerator.

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1084752A1 (fr) 1999-09-10 2001-03-21 Van den Eynde, Willy Dispositif de coup de matière
BE1012892A4 (nl) * 1999-09-10 2001-05-08 Den Eynde Willy Van Machine voor het verkleinen van afvalprodukten.
CN106140419A (zh) * 2016-07-25 2016-11-23 无锡福镁轻合金科技有限公司 一种具有水溶性功能的废纸粉碎机
CN111545309A (zh) * 2020-05-19 2020-08-18 江苏尚诚纺织科技有限公司 一种用于生产醋酸丁酸纤维素用高效棉花破碎机

Also Published As

Publication number Publication date
GB2297927A (en) 1996-08-21
GB9503149D0 (en) 1995-04-05
AU4334896A (en) 1996-08-29

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