EP0056236B1 - Walzenmühle, insbesondere für die Kohlenvermahlung - Google Patents

Walzenmühle, insbesondere für die Kohlenvermahlung Download PDF

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Publication number
EP0056236B1
EP0056236B1 EP82100023A EP82100023A EP0056236B1 EP 0056236 B1 EP0056236 B1 EP 0056236B1 EP 82100023 A EP82100023 A EP 82100023A EP 82100023 A EP82100023 A EP 82100023A EP 0056236 B1 EP0056236 B1 EP 0056236B1
Authority
EP
European Patent Office
Prior art keywords
rocking lever
grinding
roller
rocker arm
mill
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
Application number
EP82100023A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0056236A2 (de
EP0056236A3 (en
Inventor
Horst Dipl.-Ing. Brundiek
Ludwig Werner
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.)
Loesche GmbH
Original Assignee
Loesche 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 Loesche GmbH filed Critical Loesche GmbH
Priority to AT82100023T priority Critical patent/ATE19861T1/de
Publication of EP0056236A2 publication Critical patent/EP0056236A2/de
Publication of EP0056236A3 publication Critical patent/EP0056236A3/de
Application granted granted Critical
Publication of EP0056236B1 publication Critical patent/EP0056236B1/de
Expired 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
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/04—Mills with pressed pendularly-mounted rollers, e.g. spring pressed

Definitions

  • the invention relates to a roller mill, in particular for coal grinding, with a mill housing, in which grinding rollers rolling on a grinding table are arranged, of which each grinding roller is pivotally mounted with a rocker arm about a rocker arm axis, one end of a lever arm being connected to the rocker arm axis , at the other end of which a force is to be introduced.
  • Such a roller mill is known from DE-A-21 28 929. With this roller mill, no special precautions have been taken to seal the rocking lever which projects from the outside through the mill housing. An opening through which the rocking lever with the associated grinding roller can be pivoted out of the inside of the mill housing is only closed with a removable door when the rocking lever is pivoted in. Special precautions for sealing between the door and the rocker arm are not disclosed in this document.
  • DE-A-15 07 582 describes a roller mill in which the rocker arm and the grinding roller are integrated in the mill housing.
  • the disadvantage here is that the rocker arm is not sufficiently sealed against the grinding dust generated in the mill housing, so that the grinding roller bearing is exposed to increased wear.
  • the invention has for its object to provide a roller mill of the type mentioned, which ensures the best possible sealing of the rocker arm against the grinding dust with easy maintenance of the grinding rollers.
  • Air or gas flows through the mill according to the invention.
  • the air or gas is used to dry the regrind and is used as a dust transport.
  • the gas enters at a higher than atmospheric pressure below the rotating grinding plate, flows through the blade ring that surrounds the grinding plate into the grinding chamber, grinds the ground material there, dries it in the floating gas process and carries the shredded material to the classifier above the grinding chamber.
  • a roller mill is proposed, which is designed according to a modular system.
  • Each grinding roller can be manufactured as a unit with the parts required for pivoting out, so that each roller mill can be equipped with a variable number of rollers without substantial changes to the grinding roller with the associated organs for pivoting out.
  • the rocker arm is included in the mill housing and sealed gas-tight, because roller mills for grinding coal in so-called direct injection systems are operated with a hot air stream that has a higher than atmospheric pressure.
  • the rocker arm is encapsulated and incorporated into the gas-tight mill housing.
  • the rocker arm can be uncoupled from a fork, at the end of which a force is applied to press and lift the grinding roller.
  • the rocking lever of the grinding roller and the fork are positively connected to one another during operation by bolts to form a functional unit, the bolts for decoupling the rocking lever from the fork being removably arranged for the maintenance of the grinding roller and the associated parts, so that only the rocker arm takes part in a pivoting movement of the grinding roller to the outside.
  • the gas-tight closure of the rocker arm has a lid which can be connected in the upper part to the gas-tight housing and whose lower part closes the rocker arm in a curved shape and extends to a collar surrounding the roller axis.
  • a sealing air chamber is arranged around the rocker arm axis on each side of the cover. In order to achieve low resulting bearing forces on the rocker arm axis, it is expedient if the ratio of the rod force of the hydraulic cylinder to the roller force is between 50% and 150%.
  • the rocker arm is hollow and is filled with sealing air, which is introduced into the lever at any point outside the grinding chamber, preferably on one end of the axle, from where it leads to an annular gap between the roller and the sleeve of the rocker arm is guided and from here enters the grinding chamber at high pressure and high speed.
  • a roller mill according to the invention can optionally be equipped with two or more grinding rollers, a fundamental modification of the grinding roller assembly not being necessary for two or more grinding rollers.
  • This advantage is combined with a very good gas tightness of the roller mill and devices in order to be able to swing out all or one grinding roller for maintenance purposes.
  • Fig. 1 shows a schematic representation of a roller mill designed in a known manner with two grinding rollers 1, with the stands 9, of which several are arranged around the grinding bowl 10.
  • the gas-tight mill housing 12 In the area of the grinding rollers 1 there is the gas-tight mill housing 12 and the removable cover 11 for the pivoting out of the grinding rollers 1.
  • the grinding roller 1 On the left side, the grinding roller 1 'is shown in dashed lines in the pivoted-out position.
  • the classifier housing 50 with the classifier 51 is arranged above the gas-tight housing 12.
  • the outlet 52 for the hot air flow is identified by the number 52.
  • the arrow 53 indicates the path of the feed material, namely the raw coal fed into the mill.
  • the hot air flow is fed to the grinding chamber through the blade ring 56, which is fastened to the mill housing 12 in this exemplary embodiment.
  • the blade ring is attached to the grinding table 10.
  • FIG. 2 already shows essential parts of the invention, but these are shown in more detail in FIG. 3.
  • the drawing shows a side view of the grinding roller 1 on the grinding bowl 10, which is designated 1 'in the pivoted-out position.
  • the rocker arm 2 carries the axis of the grinding roller 1, which is shown in section in Fig. 3.
  • the rocker arm 2 is located within a gas-tight cover 11, which is removably attached to the housing wall 12 and surrounds the lower part of the rocker arm 2 in a curved shape and connects to the wall 27.
  • the illustration also shows in column 29 which enable the rocker arm 2 to pass through the walls 26, 27.
  • the columns 29 also serve for the outflow of air or gas from the chamber, which is formed from the cover 11 and the walls 26, 27, into the grinding chamber, the air or the gas receiving a higher pressure than the mill pressure.
  • the air or gas is introduced through the connector 30 shown in FIG. 3.
  • Gas is preferably withdrawn from the gas channel 60 below the blade ring 56. Due to the flow resistance of the blade ring 56, there is a pressure drop from the gas channel 60 into the grinding chamber 48. Therefore, gas from the gas channel 60 can be passed through the nozzle 30 into the chamber, formed from positions 11, 26, 27, 29, without an additional blower.
  • An auxiliary cylinder 37 is also provided for maintenance work and is removable. The latter engages articulated eyes 36 which are arranged in the hubs 17a, 17b.
  • the more detailed training is shown in Fig. 4, so that the further details of this training must be reserved for the discussion of Fig. 4.
  • FIG. 2 also shows the arrangement of the fork 4, which is slightly curved inwards and is connected at the end to the axis 8, which belongs to the hydropneumatic pressing device 7 with the piston 16, which ends in an axis 8 ' , which connects the hydraulic pressure device to the foundation 55 on which the gear 54 for driving the grinding bowl 10 is located.
  • the spring buffer consists of a stop pin 32 to which a spring 33 is fastened within a housing.
  • FIG. 3 shows a section through the rocker arm 2 and the rocker arm axis 3, to which the fork 4 connects at the bottom.
  • the rocker arm 2 with the rocker arm axis 3 has a gas-tight capsule 11, the upper end of which can be connected or detached to the mill housing 12, so that the rocker arm 2 can be swung out. All parts designated 12 in the illustration still belong to the gas-tight mill housing.
  • the axis 3 of the rocker arm 2 is hollow. The further training in the area of the rocker arm is such that the ingress of dust or foreign bodies through sealing air is prevented. As can be seen in FIG.
  • an air connection piece 40 is attached to one end of the hollow shaft 3, from which the sealing air is introduced into the interior 42 and 43 of the rocker arm 2 via the bore 41. From here, the sealing air passes through bores 44, which are located on both sides of the hollow axis 3, into the annular gaps 45, which are formed by the sleeve 46 and the grinding roller 1.
  • the annular gap 45 should be relatively narrow. Through this gap, the sealing air enters the grinding chamber 48 at high speed and at a higher pressure than the grinding chamber pressure, in which the rollers 1 rotate. This measure prevents the aggressive grinding dust from migrating into the gap 45 and reaching the grinding roller 1.
  • the end of the grinding roller axis is through an end plate 49 secured, as can be seen from the illustration in Fig. 3.
  • the number 29 denotes the relatively narrow gaps that form the connection to the gas-tight housing, namely 26 and 27.
  • FIG. 3 also shows bolt openings 19 in the fork 4, which are designed to be removable and represent the releasable connection between the rocker arm 2 and the fork 4.
  • the arrangement of these bolt connections 19 also results from the illustration in FIG. 4, which shows the bolt connections seen from the side.
  • FIG. 4 shows the bolt connections seen from the side.
  • the hinge eye 5 with the axis 8 is indicated.
  • Fig. 4 shows the details of the mounting of the rocker arm axis 3, the arrangement of which also results from the illustration in Fig. 3.
  • the rocker arm axis 3 is supported on the stand 9, which is shown in section in Fig. 4.
  • the fork 4 due to its curved shape, reaches through the stand 9 into the area below the grinding bowl 10.
  • the cheeks 14 are, as can be seen from the illustration, so far apart that the lid is between them 11 (see FIG. 3) can be arranged with the two sealing air chambers 15a and 15b.
  • the torque transmission i.e. H. the power transmission from the piston 16 (see FIG.
  • the rocker arm is sealed off from the outside atmosphere by encapsulating the covers 11 and 12.
  • the rocker arm passages are passed through these covers 11 and 12 provided with very narrow gaps.
  • the gaps 24 are thus blown free by introducing air or gas as a blocking agent into the connecting pieces 25 of the sealing air chambers 15a and 15b, because the supplied air or gas has a higher pressure than the gas pressure in the mill.
  • the rocker arm axis 3 is supported at its ends by roller bearings 23. With 36 articulated eyes are designated, the function of which results from the illustration in FIG. 2. Finally, the illustration in FIG. 4 shows the axis 8 at the lower end, which was already described in FIG. 2 as a hydropneumatic pressing device in connection with the hydraulic cylinder 7.
  • the shortest distance (a) (see FIGS. 2 and 3) between the axis of the hydraulic cylinder 7 and the fulcrum of the rocker arm axis 3 is between 50 and 95% of that distance (b) (see FIG. 3) , which is the center of the rocker arm axis 3 from the center of the grinding roller 1 according to the drawn line of the grinding bowl 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Mold Materials And Core Materials (AREA)
  • Table Devices Or Equipment (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Disintegrating Or Milling (AREA)
EP82100023A 1981-01-08 1982-01-05 Walzenmühle, insbesondere für die Kohlenvermahlung Expired EP0056236B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82100023T ATE19861T1 (de) 1981-01-08 1982-01-05 Walzenmuehle, insbesondere fuer die kohlenvermahlung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3100341 1981-01-08
DE19813100341 DE3100341A1 (de) 1981-01-08 1981-01-08 Walzenmuehle, insbesondere fuer die kohlenvermahlung

Publications (3)

Publication Number Publication Date
EP0056236A2 EP0056236A2 (de) 1982-07-21
EP0056236A3 EP0056236A3 (en) 1984-05-02
EP0056236B1 true EP0056236B1 (de) 1986-05-21

Family

ID=6122312

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82100023A Expired EP0056236B1 (de) 1981-01-08 1982-01-05 Walzenmühle, insbesondere für die Kohlenvermahlung

Country Status (7)

Country Link
US (1) US4432500A (enrdf_load_stackoverflow)
EP (1) EP0056236B1 (enrdf_load_stackoverflow)
JP (1) JPS57135051A (enrdf_load_stackoverflow)
AT (1) ATE19861T1 (enrdf_load_stackoverflow)
DE (2) DE3100341A1 (enrdf_load_stackoverflow)
DK (1) DK161946C (enrdf_load_stackoverflow)
ZA (1) ZA819034B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008022847A1 (de) * 2008-05-08 2009-11-19 Hitachi Power Europe Gmbh Wälzmühle mit Sperrgasbeaufschlagung
CN102580819A (zh) * 2012-02-27 2012-07-18 南京凯盛国际工程有限公司 一种新型立磨限位装置
US8755140B1 (en) 2010-01-21 2014-06-17 Marvell International Ltd. Write clock rephase for magnetic recording device
US8760785B1 (en) 2010-01-21 2014-06-24 Marvell International Ltd. Write clock phase tracking for magnetic recording device

Families Citing this family (35)

* Cited by examiner, † Cited by third party
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JPS6013245U (ja) * 1983-07-06 1985-01-29 石川島播磨重工業株式会社 竪型ミル用ピボツト軸の軸受装置
JPS60128739U (ja) * 1984-02-06 1985-08-29 三菱重工業株式会社 回転式分級装置
JPS60128784U (ja) * 1984-02-06 1985-08-29 三菱重工業株式会社 回転式分級装置
US4694997A (en) * 1985-12-12 1987-09-22 Fuller Company Apparatus for exerting a downward force on a grinding roller
JPS6320953U (enrdf_load_stackoverflow) * 1986-07-23 1988-02-12
DE4209459A1 (de) * 1992-03-24 1993-09-30 Krupp Polysius Ag Wälzmühle
DE4223151C2 (de) * 1992-07-14 1994-11-10 Loesche Gmbh Verfahren zur Mahlung von Rohbraunkohle
US5529253A (en) * 1995-04-05 1996-06-25 March-Southwestern Corp. Spring canister for pulverizer
US6609669B2 (en) 2001-09-07 2003-08-26 The Babcock & Wilcox Company Hydraulic loading system for ball and ring pulverizers
US7226010B2 (en) * 2004-02-27 2007-06-05 Abb Inc. Method and apparatus for solid fuel pulverizing operation and maintenance optimization
DE102006061328B4 (de) * 2006-12-22 2014-01-16 Gebr. Pfeiffer Ag Wälzmühle
DE102007009723A1 (de) * 2007-02-28 2008-09-04 Polysius Ag Rollenmühle
US20090008487A1 (en) * 2007-07-03 2009-01-08 Riley Power, Inc. Loading system for vertical material size reduction system
CN102066004A (zh) * 2008-05-08 2011-05-18 日立动力欧洲有限公司 利用密封气体撞击作用的滚筒碾磨机
DE202009004025U1 (de) 2009-03-19 2010-08-12 Loesche Gmbh Hydraulikanordnung für Wälzmühlen
DE102009015037B4 (de) 2009-03-26 2011-03-31 Loesche Gmbh Wälzmühle
JP5668902B2 (ja) * 2009-06-08 2015-02-12 宇部興産機械株式会社 竪型粉砕機
DE102010010752A1 (de) * 2010-03-09 2011-09-15 Loesche Gmbh Wälzmühle
JP2011183344A (ja) * 2010-03-10 2011-09-22 Ihi Corp 竪型ミル
DE102010031442A1 (de) * 2010-07-16 2012-01-19 Hitachi Power Europe Gmbh Spannsystem, insbesondere hydropneumatisches Spannsystem, einer Wälzmühle
DE102011014592A1 (de) 2011-03-21 2012-09-27 Loesche Gmbh Wälzmühle
US9429977B2 (en) * 2012-10-05 2016-08-30 Alstom Technology Ltd Relief spring stop bolt assembly for shallow bowl mills
CN103071566A (zh) * 2013-01-14 2013-05-01 莱歇研磨机械制造(上海)有限公司 一种辊式磨机磨辊安装外壳的磨辊封头结构
CN103071565A (zh) * 2013-01-14 2013-05-01 莱歇研磨机械制造(上海)有限公司 一种辊式磨机磨辊外壳安装结构
CN103100466B (zh) * 2013-01-14 2015-07-08 莱歇研磨机械制造(上海)有限公司 一种辊式磨机磨辊外壳结构
CN103071564A (zh) * 2013-01-14 2013-05-01 莱歇研磨机械制造(上海)有限公司 一种辊式磨机磨辊安装外壳的壳本体结构
CN103447789B (zh) * 2013-05-31 2016-08-10 上海宝冶集团有限公司 立式磨机磨辊辊套的更换方法
WO2014067688A1 (de) 2013-08-19 2014-05-08 Loesche Gmbh Vertikale walzenmühle
EP2999542B1 (de) 2014-10-31 2017-08-09 Loesche GmbH Mahlwalze
CN104588174A (zh) * 2015-01-27 2015-05-06 中材（天津）粉体技术装备有限公司 立式辊磨机
US10799874B2 (en) * 2015-05-27 2020-10-13 General Electric Technology Gmbh Modified journal assembly for pulverizer
WO2017137056A1 (de) 2016-02-08 2017-08-17 Loesche Gmbh Mahlwalzen-vorrichtung
US10343173B2 (en) * 2016-04-29 2019-07-09 General Electric Technology Gmbh System, method and apparatus for servicing a pulverizer
CN112156852A (zh) * 2020-10-13 2021-01-01 南京凯盛国际工程有限公司 一种用于生产机制砂的立磨
CN114653436B (zh) * 2022-03-31 2024-09-24 中材（天津）粉体技术装备有限公司 辅磨辊驱动的碾磨装置

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DE742912C (de) * 1939-08-25 1943-12-15 Neuman & Esser Federrollenmuehle fuer UEberdruckbetrieb
DE724658C (de) * 1940-06-11 1942-09-02 Ernst Curt Loesche Federung fuer die Mahlrollen von Federrollenmuehlen
DE1507582A1 (de) * 1966-07-23 1969-04-03 Loesche Kg Waelzmuehle,insbesondere Walzenmuehle fuer UEberdruckbetrieb
US3591094A (en) * 1969-02-20 1971-07-06 Peter Gauer Control system for roll grinders
DE2128929C3 (de) * 1971-06-11 1974-06-27 Loesche Hartzerkleinerungs- Und Zementmaschinen Kg, 4000 Duesseldorf Walzenmühle
US3818567A (en) * 1973-03-29 1974-06-25 American Chain & Cable Co Apparatus for positioning journal assemblies in pulverizers
JPS5222160A (en) * 1975-08-12 1977-02-19 Ube Ind Ltd Contact pressure adjusting device for powdering machine
US4000860A (en) * 1975-11-13 1977-01-04 Leesona Corporation Size reduction apparatus
DE2703535C2 (de) * 1977-01-28 1986-07-10 Loesche GmbH, 4000 Düsseldorf Wälzmühle

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008022847A1 (de) * 2008-05-08 2009-11-19 Hitachi Power Europe Gmbh Wälzmühle mit Sperrgasbeaufschlagung
DE102008022847B4 (de) * 2008-05-08 2010-10-28 Hitachi Power Europe Gmbh Wälzmühle mit Sperrgasbeaufschlagung und Verfahren zum Betreiben einer Wälzmühle
US8755140B1 (en) 2010-01-21 2014-06-17 Marvell International Ltd. Write clock rephase for magnetic recording device
US8760785B1 (en) 2010-01-21 2014-06-24 Marvell International Ltd. Write clock phase tracking for magnetic recording device
US8988808B1 (en) 2010-01-21 2015-03-24 Marvell International Ltd. Write clock rephase for magnetic recording device
CN102580819A (zh) * 2012-02-27 2012-07-18 南京凯盛国际工程有限公司 一种新型立磨限位装置

Also Published As

Publication number Publication date
EP0056236A2 (de) 1982-07-21
DK5682A (da) 1982-07-09
US4432500A (en) 1984-02-21
EP0056236A3 (en) 1984-05-02
DE3100341A1 (de) 1982-07-22
DK161946C (da) 1992-02-03
ATE19861T1 (de) 1986-06-15
DK161946B (da) 1991-09-02
DE3271222D1 (en) 1986-06-26
JPS6411339B2 (enrdf_load_stackoverflow) 1989-02-23
ZA819034B (en) 1982-11-24
JPS57135051A (en) 1982-08-20

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