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WO2018184994A1 - Goujons pour rouleaux de broyage à haute pression - Google Patents

Goujons pour rouleaux de broyage à haute pression Download PDF

Info

Publication number
WO2018184994A1
WO2018184994A1 PCT/EP2018/058134 EP2018058134W WO2018184994A1 WO 2018184994 A1 WO2018184994 A1 WO 2018184994A1 EP 2018058134 W EP2018058134 W EP 2018058134W WO 2018184994 A1 WO2018184994 A1 WO 2018184994A1
Authority
WO
WIPO (PCT)
Prior art keywords
stud
high pressure
roller
studs
recess
Prior art date
Application number
PCT/EP2018/058134
Other languages
English (en)
Inventor
Karl-Georg Hildebrand
Bernd Heinrich Ries
Original Assignee
Element Six Gmbh
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 Element Six Gmbh filed Critical Element Six Gmbh
Publication of WO2018184994A1 publication Critical patent/WO2018184994A1/fr

Links

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
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/10—Crushing or disintegrating by roller mills with a roller co-operating with a stationary member
    • B02C4/18—Crushing or disintegrating by roller mills with a roller co-operating with a stationary member in the form of a bar
    • B02C4/20—Crushing or disintegrating by roller mills with a roller co-operating with a stationary member in the form of a bar wherein the roller is corrugated or toothed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/0056—Other disintegrating devices or methods specially adapted for specific materials not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/30—Shape or construction of rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/30—Shape or construction of rollers
    • B02C4/305—Wear resistant rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C2210/00—Codes relating to different types of disintegrating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C2210/00—Codes relating to different types of disintegrating devices
    • B02C2210/01—Indication of wear on beaters, knives, rollers, anvils, linings and the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C2210/00—Codes relating to different types of disintegrating devices
    • B02C2210/02—Features for generally used wear parts on beaters, knives, rollers, anvils, linings and the like

Definitions

  • the invention relates to the field of studs for high pressure grinding rollers and methods of using such studs.
  • HPGR apparatus includes a first roller 1 and a second roller 2 with a gap between them. In use, the first and second rollers counter-rotate. A feed of material 3 is allowed to fall from a hopper through a gap between the first and second rollers 1, 2. The first roller 1 is allowed to move linearly in a direction normal to the direction of the material feed. The first roller is usually biased to a particular position relative to the second roller by springs or hydraulic cylinders
  • the rollers 1, 2 may have a flat surface, but in some examples (such as that shown in Figure 2) the rollers have a plurality of studs disposed on the surface. Studs have the advantage of increasing the pressure where they contact the feed material and protecting the roller itself.
  • the studs are typically made from a hard material such as cemented tungsten carbide and provide an effective roller surface. After continuous use for a period of time, the studs show signs of wear.
  • the feed material 3 usually falls through the gap at the middle of the rollers, as shown in Figure 3. This leads to uneven wear and the gap between the effective roller surfaces at the middle of the rollers becomes larger than the gap towards the ends of the rollers.
  • a reconditionable high pressure grinding roller stud is cylindrical and comprises a grinding surface, an attachment end configured to attach to a roller, and a side wall connecting the grinding surface to the attachment end, the side wall comprising a recess.
  • the recess extends around a circumference of the side wall.
  • the recess extends fully around a circumference of the side wall. In this embodiment, the recess extends circumferentially a full 360 degrees around the stud.
  • the stud comprises a cemented metal carbide material.
  • the grinding surface optionally has a diameter selected from any of between 12 and 30 mm, between 14 and 25 mm, and between 16 and 20 mm.
  • the recess optionally has a depth selected from between 1 and 6 mm. As a further option, the recess has a depth selected from between 2 and 4 mm. As an option, the recess forms an angle between 40 and 80°. As a further option, the recess forms an angle between 50 and 70°.
  • a stud optionally comprises a plurality of recesses, allowing a volume to be removed a plurality of times.
  • the attachment end is optionally configured to attach to the roller by any of gluing, brazing, press-fitting, shrink fitting, threaded connection, and mechanical connection.
  • a high pressure grinding roller comprising a cylindrical roller having a circumferential surface and a plurality of high pressure grinding rollers studs according to any one of claims 1 to 10 attached to the circumferential surface.
  • the high pressure grinding roller comprises:
  • each stud of the first plurality of high pressure grinding roller studs having a recess located a first distance from the grinding surface, the first plurality of high pressure grinding studs being located at a first location on the circumferential surface;
  • each stud of the first second plurality of high pressure grinding roller studs having a recess located a second distance from the grinding surface, the second plurality of high pressure grinding studs being located at a second location on the circumferential surface.
  • the high pressure grinding roller comprises:
  • each stud of the further plurality of high pressure grinding roller studs having a recess located a third distance from the grinding surface, the third plurality of high pressure grinding studs being located at a third location on the circumferential surface. It will be appreciated that further pluralities of studs may be provided with the location of the recess set according to the position of the studs on the roller to compensate for expected wear.
  • each high pressure grinding roller stud is attached to the roller by any of gluing, brazing, press-fitting, shrink fitting, threaded connection, and mechanical connection.
  • a method of reconditioning a high pressure grinding roller as described above in the second aspect For at least a portion of the plurality of high pressure grinding roller studs, a volume of each stud between the recess and the grinding surface is removed to expose a new, second grinding surface.
  • the volume is removed by applying a shear force at the recess.
  • the volume is removed by using any of a hammer and a chisel.
  • the volume is removed during a grinding operation.
  • Figure 1 illustrates schematically a known high pressure grinding roller apparatus
  • Figure 2 shows rollers comprising studs
  • Figure 3 illustrates schematically a plan view of a pair of rollers after use
  • Figure 4 is a side elevation view of a first exemplary high pressure grinding roller stud
  • Figure 5 is a schematic cross-section view of an exemplary high pressure grinding roller
  • Figure 6 is a schematic cross-section view of a high pressure grinding roller showing wear
  • Figure 7 is a side elevation view of the first exemplary high pressure grinding roller stud after removing a volume between a circumferential recess and a grinding surface;
  • Figure 8 is a schematic side view of a high pressure grinding roller after reconditioning
  • Figure 9 is a flow diagram showing exemplary steps for reconditioning a high pressure grinding roller;
  • Figure 10 shows a side elevation view of a second exemplary high pressure grinding roller stud;
  • Figure 11 illustrates schematically a first test for removing a volume of a high pressure grinding roller stud
  • Figure 12 illustrates schematically a second test for removing a volume of a high pressure grinding roller stud
  • Figure 13 is a photograph showing a new exposed grinding surface after a volume between the circumferential recess and the grinding surface has been removed
  • Figure 14 shows a side elevation view of a third exemplary high pressure grinding roller stud.
  • a high pressure grinding roller stud 7 is provided.
  • the stud 7 has a grinding surface 8 arranged to contact the material to be ground.
  • An attachment end 9 is located at an end opposite to the grinding surface 8.
  • the grinding surface 8 and the attachment end 9 are connected by a side wall 10.
  • the stud is substantially cylindrical except for a circumferential recess 11 extending around the side wall 10, having a deepest point at a predetermined distance d from the grinding surface 8.
  • the circumferential recess 11 defines an angle a and has a depth D.
  • the stud 7 is unitary and has a cylindrical body comprising first and second body portions which interface at the recess 11.
  • the first body portion includes the grinding surface 8, whereas the second body portion includes the attachment end 9.
  • the stud 7 is reconditionable in that the first body portion is removable from the second body portion at the recess 7, and only by virtue of the recess 7, to expose a further grinding surface, as will be explained in more detail below.
  • the stud 7 is attached to a high pressure grinding roller toward the attachment end 9 by any suitable means, such as gluing, brazing, shrink fitting, press fitting and so on.
  • a plurality of studs is attached to the grinding roller such that the grinding surface 8 of each stud 7 is at a desired height, and the plurality of grinding surfaces 8 forms an effective roller surface, as shown in Figure 5.
  • the circumferential recess 11 of each stud 7 is located below the steel surface of the roller 12.
  • the studs located towards the centre of the roller 14 need not have a circumferential recess 11, as these studs will be subject to more wear when in use.
  • the effective surface of the roller is shown by dashed line 13.
  • the studs towards the middle of the grinding roller are likely to have been subjected to more wear than the studs towards the ends of the grinding roller, and so the effective grinding surface is no longer flat (or the desired shape profile).
  • the studs 14 towards the centre of the roller have experience more wear than the studs at either end of the roller, and so the effective surface is no longer flat and resembles the surface shown in Figure 3.
  • the steel roller 12 also experiences wear and the circumferential recess 11 of a stud becomes exposed. The exposure of the circumferential recess 11 of certain studs can be used as an indicator to inform an operator that an unacceptable degree of wear has occurred and the roller 12 requires reconditioning.
  • the distance of the circumferential recess from the grinding surface of each stud may vary according to the stud's position on the roller; a stud towards the middle of the roller 12 may have a shorter distance between the circumferential recess 11 and the grinding surface than a stud towards the end of the grinding roller.
  • a stud towards the middle of the grinding roller may not be provided with a circumferential recess at all, but the studs towards the ends of the roller are provided with a recess to compensate for uneven wear.
  • a volume of the stud 7 between the circumferential recess 11 and the grinding surface 8 is removed to expose a new grinding surface 15, as shown in Figure 7.
  • the new grinding surface 15 of each stud 7 forms a new effective roller surface 16 and the new effective roller surface 16 is once more uniform.
  • the distance of the recess 11 to the grinding surface for an individual stud varies according to the position of the stud on the roller 12. This ensures that after reconditioning, all studs provide an approximately flat effective surface.
  • the studs towards the centre 14 of the roller 12 are not provided with a recess because they are subjected to the maximum wear and so form a baseline for the effective roller surface.
  • the effective roller surface 16 is shown as being substantially flat and parallel to the axis of rotation of the roller 12, the distance d of the circumferential recess 11 can be selected according to the position of the stud 7 on the roller 12. In this way a profile effective grinding surface can be achieved.
  • An HPGR roller is provided that has an effective surface made up of studs, at least some of the studs having a circumferential recess located on a side wall of the stud. S2. The roller is used until there is an unacceptable amount of wear on the studs, meaning that the roller requires reconditioning.
  • Each stud with a circumferential has a volume removed between the circumferential recess and the grinding surface of the stud. This exposes a new, second grinding surface.
  • studs have previously been reconditioned by grinding them back to a desired shape. However, this is a time-consuming and expensive operation.
  • An advantage of using studs with a circumferential recess is that the circumferential recess provides a weak point in the stud allowing the volume of the stud above the circumferential recess to be quickly and easily removed. There are various ways this volume can be removed, for example by an operator shearing off the volume with a hammer or chisel.
  • the recess design can be engineered such that when the recess is exposed from the steel, it is removed automatically during a grinding process from impact with the material being ground. Examples
  • Example 1 as illustrated in Figure 4, had a circumferential recess 11 with a depth d of 4 mm, an angle a of 60° and the diameter of the stud at the deepest point of the recess was 11.2 mm. This means that the cross-sectional diameter, at the weakest point, was 98.5 mm 2 .
  • Example 1 was made from a cemented tungsten carbide comprising 15% Co with a hardness of 1050 HV30. It will be appreciated that other hard materials may be used. Cemented tungsten carbide grades having between 8 and 20% Co and a hardness range of 850 to 1300 HV30 are examples of suitable materials.
  • Example 2 was also made from a cemented tungsten carbide comprising 15% Co with a hardness of 1050 HV30.
  • Test 1 illustrated in Figure 11 using Example 1, used a vertical impact applied with a 2000 g hammer struck directly onto the grinding surface 8 along a main central axis of the stud 7.
  • Test 2 illustrated in Figure 12 using Example 1, used a horizontal impact wedge 18 placed in the circumferential recess 11, and the impact wedge was then impacted with a 2000 g hammer at a direction normal to the main central axis of the stud 7.
  • Example 1 undergoing test 1 broke under impact from the 2000 g hammer to leave a clean, second grinding surface 15, as shown in Figure 13.
  • Example 2 undergoing test 1 showed no damage after several impacts from the 2000 g hammer.
  • Example 1 undergoing test 2 sheared off after a few strokes of the 2000 g hammer to leave a clean, second grinding surface 15.
  • Example 2 undergoing test 2 sheared off after a few strokes of the 2000 g hammer to leave a clean, second grinding surface 15.
  • the weak point at the circumferential recess must not be so weak that the volume between the circumferential recess 11 and the grinding surface 8 breaks off during normal operation until the recess 11 becomes exposed as the steel wears away, and the stud is configured to have a volume removed during the normal grinding operation.
  • the examples describe a recess that extends all the way around the circumference of the side wall of a cylindrical stud, but it will be appreciated that the recess may not extend all the way around.
  • the recess may be applied on one, two, three or four of the sides.
  • the main function of the recess is to create a weakened area that allows a predetermined volume of the stud to be removed when necessary.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Abstract

L'invention concerne un goujon de rouleau de broyage à haute pression pouvant être reconditionné. Le goujon est sensiblement cylindrique et comprend une surface de broyage; une extrémité de fixation configurée pour se fixer à un rouleau; et une paroi latérale reliant la surface de broyage à l'extrémité de fixation. La paroi latérale comprend un évidement s'étendant autour d'une circonférence de la paroi latérale. L'évidement permet un reconditionnement facile du goujon de telle sorte que la surface de broyage usée peut être retirée pour exposer une seconde surface de broyage.
PCT/EP2018/058134 2017-04-06 2018-03-29 Goujons pour rouleaux de broyage à haute pression WO2018184994A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB1705576.5A GB201705576D0 (en) 2017-04-06 2017-04-06 Studs for high pressure grinding rollers
GB1705576.5 2017-04-06

Publications (1)

Publication Number Publication Date
WO2018184994A1 true WO2018184994A1 (fr) 2018-10-11

Family

ID=58744624

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/058134 WO2018184994A1 (fr) 2017-04-06 2018-03-29 Goujons pour rouleaux de broyage à haute pression

Country Status (2)

Country Link
GB (2) GB201705576D0 (fr)
WO (1) WO2018184994A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114950636A (zh) * 2022-06-06 2022-08-30 唐山迁西大方科技有限公司 铠甲钉辊套及其制备方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011048226A1 (fr) * 2009-10-24 2011-04-28 Siempelkamp Giesserei Gmbh Cylindre broyeur et bandage annulaire pour un cylindre broyeur
US20130299618A1 (en) * 2010-12-29 2013-11-14 Flsmidth A/S Crushing body and method of making the same
US20160318024A1 (en) * 2015-04-29 2016-11-03 Takraf Gmbh Hard body as grid armoring for a roller press, a method for its production, and a roller for a roller press

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4850241B2 (ja) * 2006-03-30 2012-01-11 株式会社小松製作所 耐摩耗粒子及び耐摩耗構造部材
CN102839976B (zh) * 2008-01-08 2015-09-30 爱斯科公司 耐磨帽以及耐磨帽和基座组件
JP2014097489A (ja) * 2012-10-17 2014-05-29 Mitsubishi Materials Corp 多結晶シリコンの破砕装置
CN203803598U (zh) * 2013-12-06 2014-09-03 福建铁拓机械有限公司 一种用于废旧沥青混合料的破碎辊
CN107405624B (zh) * 2015-03-25 2020-10-30 Fl史密斯公司 耐磨本体及其制造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011048226A1 (fr) * 2009-10-24 2011-04-28 Siempelkamp Giesserei Gmbh Cylindre broyeur et bandage annulaire pour un cylindre broyeur
US20130299618A1 (en) * 2010-12-29 2013-11-14 Flsmidth A/S Crushing body and method of making the same
US20160318024A1 (en) * 2015-04-29 2016-11-03 Takraf Gmbh Hard body as grid armoring for a roller press, a method for its production, and a roller for a roller press

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114950636A (zh) * 2022-06-06 2022-08-30 唐山迁西大方科技有限公司 铠甲钉辊套及其制备方法
CN114950636B (zh) * 2022-06-06 2024-04-26 唐山迁西大方科技有限公司 铠甲钉辊套及其制备方法

Also Published As

Publication number Publication date
GB201705576D0 (en) 2017-05-24
GB201805156D0 (en) 2018-05-16
GB2562881A (en) 2018-11-28

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