EP0107044B1 - Bull ring for a coal pulverizer - Google Patents

Bull ring for a coal pulverizer Download PDF

Info

Publication number
EP0107044B1
EP0107044B1 EP83109386A EP83109386A EP0107044B1 EP 0107044 B1 EP0107044 B1 EP 0107044B1 EP 83109386 A EP83109386 A EP 83109386A EP 83109386 A EP83109386 A EP 83109386A EP 0107044 B1 EP0107044 B1 EP 0107044B1
Authority
EP
European Patent Office
Prior art keywords
wear
resistant layer
base
grinding table
pulverizer
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
EP83109386A
Other languages
German (de)
French (fr)
Other versions
EP0107044A3 (en
EP0107044A2 (en
Inventor
Theodore Vincent Maliszewski, Jr.
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.)
Combustion Engineering Inc
Original Assignee
Lummus Crest SARL
Combustion Engineering Inc
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 Lummus Crest SARL, Combustion Engineering Inc filed Critical Lummus Crest SARL
Publication of EP0107044A2 publication Critical patent/EP0107044A2/en
Publication of EP0107044A3 publication Critical patent/EP0107044A3/en
Application granted granted Critical
Publication of EP0107044B1 publication Critical patent/EP0107044B1/en
Expired 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • 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
    • B02C15/003—Shape or construction of discs or rings

Definitions

  • the present invention relates to the formation of a bull ring having a ductile base and a surface layer with high abrasion resistance. More particularly, the invention relates to a bull ring having a unitary body of high ductility overlayed with an alloy of chromium and carbide forming a contact surface which is highly abrasive resistant.
  • U.S. Patents 2,848,170 and 3,138,337 are selected as representing the terminology and technology of the art of the present invention. Both disclosures illustrate the housing for a bowl mill in which a rotating table is powered by a vertical shaft. Grinding elements in the form of rolls are forced down upon the upper surface of the rotating table by springs, or hydraulic pressure, and coal is fed between the rolls and table surfaces for reducing the size of the coal. Air under pressure is introduced to the housing to remove the coal pulverized to a predetermined size. Routing is provided to regrind that coal not reduced to the desired size.
  • German Patent No. 1,507,580 and U.S. Patent No. 3,186,560 contain teachings which are deemed to be relevant to the subject matter of the present patent application. More specifically, German patent No. 1,507,580 discloses a bull ring for the rotating table of a coal pulverizer with a body of cast steel and Ni-hard alloy. The cast steel is fastened to the upper portion of the rotating table and the Ni-hard alloy is bonded to the upper surface of the cast steel body to form the contact surface with the pulverizing elements of the coal pulverizer.
  • U.S. Patent No. 3,186,560 discloses overlaying a continuous unitary basic body of steel with an alloy which is capable of satisfactorily resisting abrasion while yet not impairing the performance of the steel body as a ductile material.
  • the table, or bowl has its upper surface provided with a working area by a so-called "bull ring".
  • the bull ring structure provides a track which interfaces directly with the surface of the rolls forced downward to bring the surfaces into engagement.
  • the bull ring is exposed to the severe wear of abrasion resulting from crushing or pulverizing coal particles against the roll surface.
  • the art has a long history of concern with the problems and their solutions relating to these bull ring bodies and the surfaces they provide.
  • the bull ring At some point in the early development of the bull ring, it was forged as a unitary body from steel. The strength and ductility of the forged steel bull ring was satisfactory, but its resistance to the wear of abrasion was not.
  • the art moved toward the use of Ni-hard for the single-piece bull ring to improve the resistance to abrasion.
  • Ni-hard is a material well-known to the art as an alloy characterized by its high nickel content.
  • the single-piece Ni-hard bull ring was satisfactorily resistant to the wear of abrasion, but, unfortunately, proved to be unsatisfactorily brittle and, therefore, subject to a breakage from fit-up problems.
  • a pulverizer bull ring which is particularly suited for employment in a pulverizer of the type that is operative to pulverize material that includes a housing, a grinding table having an upper surface embodying a predetermined configuration supported within the housing for rotation relative thereto, drive means supported within the housing in cooperative association with the grinding table so as to be operative to impart rotation to the grinding table, roll means having an outer surface and supported within the housing in juxtaposed relation to the grinding table so as to coact therewith to cause material to be pulverized.
  • the subject pulverizer bull ring comprises a base and a wear-resistant layer of material.
  • the base which is made of cast steel includes an upper surface that embodies a predetermined configuration and a lower surface.
  • the lower surface of the base embodies a configuration complementary to the predetermined configuration of the upper surface of the grinding table.
  • the wear-resistant layer of material includes an upper surface and a lower surface.
  • the lower surface of the wear-resistant layer of material embodies a configuration complementary to the predetermined configuration of the upper surface of the base.
  • the wear-resistant layer of material is bonded to the upper surface of the base by deposit thereon as welding strip material so as to be operative as a contact surface between the grinding table and the roll means.
  • the upper surface of the wear-resistant layer of material which has a width defined by an outer circumference and an inner circumference includes a first portion defined as the area extending from the outer circumference of the upper surface of the wear-resistant layer of material to a point lying substantially midway between the outer circumference and the inner circumference of the wear-resistant layer of material.
  • the second portion is defined as the area extending from a point lying substantially midway between the outer circumference and the inner circumference of the wear-resistant layer of material and the inner circumference of the upper surface of the wear-resistant layer of material.
  • the first portion has an upper surface inclined at an angle so as to mate with the outer surface of the roll means, while the second portion has an upper surface inclined at an angle different than the angle that the upper surface of the first portion is inclined at.
  • the wear-resistant layer of material is formed of a chromium carbide alloy that includes 27.5% chromium, 4.8% carbon, 6.3% manganese and 1.5% silica.
  • Fig. 1 is a sectioned elevation of the major parts of a coal pulverizing mill with a bowl, or table, having a grinding ring embodying the present invention
  • Fig. 2 is a section of the grinding ring of Fig. 1.
  • the rotated bowl, or table, of a coal pulverizing mill is provided with a surface to come into direct contact with the balls, or rolls, which can stand up to the severe service of directly reducing solid coal to the desired size.
  • the surface is provided by a separate grinding ring colloquially referred to as a bull ring.
  • this grinding, or bull ring is in the order of 100" in outside diameter, and provided with a track in the order of 20" wide for direct contact with the rolls.
  • the ground coal, pulverized to the desired size is air- lifted out of the mill.
  • the systems for feeding, recirculating, and air-lifting this solid fuel will not be described in detail.
  • the invention is disclosed as embodied in the construction of the bull ring which is clamped to the rotating table. It is not necessary to disclose the structure with which the bull ring is clamped to the upper surface of the rotating table.
  • the mill has a housing 1 with internal frame members on which is mounted a motor connected to a pinion gear 2 engaging the gears of a vertical shaft 3 on the upper end of which is mounted a bowl, ortable 4.
  • a roll 5 is here disclosed as mounted on a trunnion so that the roll may be forced down upon the surface provided by the table 4.
  • a shoot 6 connects with an outside source of coal to direct the coal from the source to the center of table 4.
  • This solid fuel to be pulverized is centrifugally thrown between the surface of the roll and the surface provided by the invention on the table 4.
  • air entering port 10 is directed upward to lift the particles of coal into exit duct 11.
  • the invention is embodied in the bull ring 12 which is clamped to the upper surface of the rotating table 4.
  • the mating surfaces of the ring and table are fitted with great precision in order that the tremendous pressure of the roll will not overflex the body of the ring and cause its fracture.
  • the basic body of the ring 12 is formed of cast steel in order to provide ductility required of this body, while the upper surface of the ring is provided with an abrasive-resistant material which can withstand the severe service of grinding coal between it and the roll surface.
  • Fig. 2 is simply the bull ring 12 sectioned to disclose a precise relationship between the base of the ring and the overlay material on its upper surface.
  • Base 15 is the cast steel body whose undersurface 16 mates with the upper surface of table 4. On the upper surface of this base 15 there is deposited the abrasion-resistant material which, together with the base, form the unique combination of the invention.
  • the present invention is in the structure of the ring 12 and not the process with which it is formed.
  • the cast steel base 15 has its upper surface covered with an alloy 17 which is preferably 27.5% chromium, 4.8% carbon, 6.3% manganese, and 1.5% silica.
  • This material 17 may be deposited by welding it to the upper surface of the base 15, or it may be sintered thereon in powdered form. However deposited, the material is formed as illustrated in Fig. 2 with a surface 18 angled to mate with the surface of the roll.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Disintegrating Or Milling (AREA)

Description

    TECHNICAL FIELD
  • The present invention relates to the formation of a bull ring having a ductile base and a surface layer with high abrasion resistance. More particularly, the invention relates to a bull ring having a unitary body of high ductility overlayed with an alloy of chromium and carbide forming a contact surface which is highly abrasive resistant.
    • BACKGROUND ART
  • U.S. Patents 2,848,170 and 3,138,337 are selected as representing the terminology and technology of the art of the present invention. Both disclosures illustrate the housing for a bowl mill in which a rotating table is powered by a vertical shaft. Grinding elements in the form of rolls are forced down upon the upper surface of the rotating table by springs, or hydraulic pressure, and coal is fed between the rolls and table surfaces for reducing the size of the coal. Air under pressure is introduced to the housing to remove the coal pulverized to a predetermined size. Routing is provided to regrind that coal not reduced to the desired size.
  • In addition to the teachings of the two above- identified U.S. patents, German Patent No. 1,507,580 and U.S. Patent No. 3,186,560 contain teachings which are deemed to be relevant to the subject matter of the present patent application. More specifically, German patent No. 1,507,580 discloses a bull ring for the rotating table of a coal pulverizer with a body of cast steel and Ni-hard alloy. The cast steel is fastened to the upper portion of the rotating table and the Ni-hard alloy is bonded to the upper surface of the cast steel body to form the contact surface with the pulverizing elements of the coal pulverizer. U.S. Patent No. 3,186,560, on the other hand, discloses overlaying a continuous unitary basic body of steel with an alloy which is capable of satisfactorily resisting abrasion while yet not impairing the performance of the steel body as a ductile material.
  • In further detail, the table, or bowl, has its upper surface provided with a working area by a so- called "bull ring". The bull ring structure provides a track which interfaces directly with the surface of the rolls forced downward to bring the surfaces into engagement. As a separate body connected, attached, or fastened to the table, the bull ring is exposed to the severe wear of abrasion resulting from crushing or pulverizing coal particles against the roll surface. The art has a long history of concern with the problems and their solutions relating to these bull ring bodies and the surfaces they provide.
  • At some point in the early development of the bull ring, it was forged as a unitary body from steel. The strength and ductility of the forged steel bull ring was satisfactory, but its resistance to the wear of abrasion was not. The art moved toward the use of Ni-hard for the single-piece bull ring to improve the resistance to abrasion. Ni-hard is a material well-known to the art as an alloy characterized by its high nickel content. The single-piece Ni-hard bull ring was satisfactorily resistant to the wear of abrasion, but, unfortunately, proved to be unsatisfactorily brittle and, therefore, subject to a breakage from fit-up problems. The breakage problems of Ni-hard were then attacked by sec- tionalizing the ring and progress was made in the problem of breakage with this material. However, the bull ring, in sections, unfortunately imprinted on the ductile material of its table, multiplying the problem of fit-up during replacement. τ
  • The search continues for a balance of materials in the form of a continuous, unitary bull ring body. A degree of ductility is required which can apparently be met only by steel. The basic body of steel must be sheathed, or overlayed, with an alloy satisfactorily resistant to abrasion and which will not impair the performance of the steel body as a ductile material which can be readily fitted to the bowl or table.
    • DISCLOSURE OF THE INVENTION
  • In accordance with the present invention there is provided a pulverizer bull ring which is particularly suited for employment in a pulverizer of the type that is operative to pulverize material that includes a housing, a grinding table having an upper surface embodying a predetermined configuration supported within the housing for rotation relative thereto, drive means supported within the housing in cooperative association with the grinding table so as to be operative to impart rotation to the grinding table, roll means having an outer surface and supported within the housing in juxtaposed relation to the grinding table so as to coact therewith to cause material to be pulverized. The subject pulverizer bull ring comprises a base and a wear-resistant layer of material. The base which is made of cast steel includes an upper surface that embodies a predetermined configuration and a lower surface. The lower surface of the base embodies a configuration complementary to the predetermined configuration of the upper surface of the grinding table. The wear-resistant layer of material includes an upper surface and a lower surface. The lower surface of the wear-resistant layer of material embodies a configuration complementary to the predetermined configuration of the upper surface of the base. The wear-resistant layer of material is bonded to the upper surface of the base by deposit thereon as welding strip material so as to be operative as a contact surface between the grinding table and the roll means. The upper surface of the wear-resistant layer of material which has a width defined by an outer circumference and an inner circumference includes a first portion defined as the area extending from the outer circumference of the upper surface of the wear-resistant layer of material to a point lying substantially midway between the outer circumference and the inner circumference of the wear-resistant layer of material. The second portion is defined as the area extending from a point lying substantially midway between the outer circumference and the inner circumference of the wear-resistant layer of material and the inner circumference of the upper surface of the wear-resistant layer of material. The first portion has an upper surface inclined at an angle so as to mate with the outer surface of the roll means, while the second portion has an upper surface inclined at an angle different than the angle that the upper surface of the first portion is inclined at. The wear-resistant layer of material is formed of a chromium carbide alloy that includes 27.5% chromium, 4.8% carbon, 6.3% manganese and 1.5% silica.
  • The objects, advantages, and features of the invention will become apparent to one skilled in the art upon consideration of the written specification, appended claim and accompanying drawings.
    • BRIEF DESIGNATION OF THE DRAWINGS
  • Fig. 1 is a sectioned elevation of the major parts of a coal pulverizing mill with a bowl, or table, having a grinding ring embodying the present invention; and
  • Fig. 2 is a section of the grinding ring of Fig. 1.
    • BEST MODE FOR CARRYING OUT THE INVENTION
  • Terms and Technology
  • The rotated bowl, or table, of a coal pulverizing mill is provided with a surface to come into direct contact with the balls, or rolls, which can stand up to the severe service of directly reducing solid coal to the desired size. The surface is provided by a separate grinding ring colloquially referred to as a bull ring. In dimensional perspective, this grinding, or bull ring is in the order of 100" in outside diameter, and provided with a track in the order of 20" wide for direct contact with the rolls. The ground coal, pulverized to the desired size, is air- lifted out of the mill. The systems for feeding, recirculating, and air-lifting this solid fuel will not be described in detail. The invention is disclosed as embodied in the construction of the bull ring which is clamped to the rotating table. It is not necessary to disclose the structure with which the bull ring is clamped to the upper surface of the rotating table.
  • Overall Organization Of The Mill
  • The mill has a housing 1 with internal frame members on which is mounted a motor connected to a pinion gear 2 engaging the gears of a vertical shaft 3 on the upper end of which is mounted a bowl, ortable 4. Although there may be more than one, a roll 5 is here disclosed as mounted on a trunnion so that the roll may be forced down upon the surface provided by the table 4.
  • A shoot 6 connects with an outside source of coal to direct the coal from the source to the center of table 4. This solid fuel to be pulverized is centrifugally thrown between the surface of the roll and the surface provided by the invention on the table 4. When ground to the desired size, air entering port 10 is directed upward to lift the particles of coal into exit duct 11.
  • The invention is embodied in the bull ring 12 which is clamped to the upper surface of the rotating table 4. The mating surfaces of the ring and table are fitted with great precision in order that the tremendous pressure of the roll will not overflex the body of the ring and cause its fracture. The basic body of the ring 12 is formed of cast steel in order to provide ductility required of this body, while the upper surface of the ring is provided with an abrasive-resistant material which can withstand the severe service of grinding coal between it and the roll surface.
  • Fig. 2 is simply the bull ring 12 sectioned to disclose a precise relationship between the base of the ring and the overlay material on its upper surface. Base 15 is the cast steel body whose undersurface 16 mates with the upper surface of table 4. On the upper surface of this base 15 there is deposited the abrasion-resistant material which, together with the base, form the unique combination of the invention.
  • The present invention is in the structure of the ring 12 and not the process with which it is formed. The cast steel base 15 has its upper surface covered with an alloy 17 which is preferably 27.5% chromium, 4.8% carbon, 6.3% manganese, and 1.5% silica. This material 17 may be deposited by welding it to the upper surface of the base 15, or it may be sintered thereon in powdered form. However deposited, the material is formed as illustrated in Fig. 2 with a surface 18 angled to mate with the surface of the roll.
  • From the foregoing, it will be seen that this invention is one well adapted to attain all of the ends and objects hereinabove set forth, together with other advantages which are obvious and inherent to the apparatus.

Claims (1)

  1. In a pulverizer operative to pulverize material, said pulverizer including a housing (1), a grinding table (4) having an upper surface embodying a predetermined configuration supported within the housing (1) for rotation relative thereto, drive means (2, 3) supported within the housing (1) in cooperative association with the grinding table (4) so as to be operative to impart rotation to the grinding table (4), roll means (5) having an outer surface and supported within the housing (1) in juxtaposed relation to the grinding table (4) so as to coact therewith to cause material to be pulverized, and a pulverizer bull ring (12) supported on the grinding table (4) for rotation therewith characterized in that said pulverizer bull ring (12) comprises:
    a.) a base (15) made of cast steel, said base (15) including an upper surface embodying a predetermined configuration and a lower surface (16), said lower surface (16) of said base (15) embodying a configuration complementary to the predetermined configuration of the upper surface of the grinding table (4); and
    b.) a wear-resistant layer (17) of material including an upper surface and a lower surface, said lower surface of said wear-resistant layer (17) of material embodying a configuration complementary to the predetermined configuration of said upper surface of said base (15), said wear-resistant layer of material being bonded to said upper surface of said base (15) by deposit thereon as welding strip material so as to be operative as a contact surface between the grinding table (4) and the roll means (5), said upper surface of said wear-resistant layer (17) of material having a width defined by an outer circumference and an inner circumference, said upper surface of said wear-resistant layer (17) of material including a first portion (18) being defined as the area extending from the outer circumference of said upper surface of said wear-resistant layer (17) of material to a point lying substantially midway between the outer circumference and the inner circumfernce of said wear-resistant layer (17) of material, a second portion being defined as the area extending from a point lying substantially midway between the outer circumference and the inner circumference of said upper surface of said wear-resistant layer (17) of material and the inner circumference of said upper surface of said wear-resistant layer (17) of material, said first portion (18) having an upper surface inclined at an angle so as to mate with the outer surface of the roll means (5), said second portion having an upper surface inclined towards the base (16) at an angle different than the angle that the upper surface of said first portion (18) is inclined at, said wear-resistant layer of material being formed of a chromium carbide alloy that includes 27.5% chromium, 4.8% carbon, 6.3% manganese and 1.5% silica.
EP83109386A 1982-10-22 1983-09-21 Bull ring for a coal pulverizer Expired EP0107044B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US43608982A 1982-10-22 1982-10-22
US436089 1982-10-22

Publications (3)

Publication Number Publication Date
EP0107044A2 EP0107044A2 (en) 1984-05-02
EP0107044A3 EP0107044A3 (en) 1986-03-12
EP0107044B1 true EP0107044B1 (en) 1989-02-01

Family

ID=23731069

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83109386A Expired EP0107044B1 (en) 1982-10-22 1983-09-21 Bull ring for a coal pulverizer

Country Status (9)

Country Link
EP (1) EP0107044B1 (en)
JP (1) JPS5992038A (en)
KR (1) KR840006296A (en)
AU (1) AU567696B2 (en)
CA (1) CA1235105A (en)
DE (1) DE3379103D1 (en)
ES (1) ES8503525A1 (en)
IN (1) IN157719B (en)
ZA (1) ZA836264B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103468990A (en) * 2013-09-18 2013-12-25 胡力 Production line for producing vanadium-nitrogen alloy billets

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IN166426B (en) * 1986-02-24 1990-05-05 Combustion Eng
KR100382575B1 (en) * 2000-09-27 2003-05-01 이영진 A recycled roller tire for pulverizer and a recycling process therefor
KR100660569B1 (en) * 2005-12-15 2006-12-22 한국남동발전 주식회사 Maintenance method of roller and turn table of pulverizer
KR100799294B1 (en) * 2007-10-05 2008-01-30 어드벤스드레곤(주) A fire sensor in the pulverizer for a thermal power plant
US9604226B2 (en) 2012-05-01 2017-03-28 Innovative Combustion Technologies, Inc. Pulverizer mill protection system
WO2013166179A1 (en) 2012-05-01 2013-11-07 Innovative Combustion Technologies, Inc. Pulverizer mill protection system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2848170A (en) * 1953-07-24 1958-08-19 Combustion Eng Wear compensating means for pulverizing mills of the ring-roller type
GB928928A (en) * 1961-04-13 1963-06-19 Mond Nickel Co Ltd Improvements relating to liners for grinding mills
US3138337A (en) * 1963-03-26 1964-06-23 Combustion Eng Pulverizing bowl mill utlizing a segmented bull ring
US3355264A (en) * 1965-02-03 1967-11-28 Canada Iron Foundries Ltd Composite impact and abrasion resistant material
DE1507580A1 (en) * 1966-05-20 1969-04-03 Loesche Kg Wear part, in particular grinding ring segment for roller mills, roller mills, spring roller mills and the like.
FR2492275A1 (en) * 1980-10-21 1982-04-23 Genot Francois Hammer for crushing domestic refuse - is made of tough, wear resistant cast steel
ZA844074B (en) * 1983-05-30 1986-04-30 Vickers Australia Ltd Abrasion resistant materials

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103468990A (en) * 2013-09-18 2013-12-25 胡力 Production line for producing vanadium-nitrogen alloy billets
CN103468990B (en) * 2013-09-18 2016-03-09 胡力 For the production of the production line of the blank of VN alloy

Also Published As

Publication number Publication date
DE3379103D1 (en) 1989-03-09
ZA836264B (en) 1984-04-25
CA1235105A (en) 1988-04-12
ES526537A0 (en) 1985-03-01
KR840006296A (en) 1984-11-29
ES8503525A1 (en) 1985-03-01
AU2049183A (en) 1984-05-03
IN157719B (en) 1986-05-24
AU567696B2 (en) 1987-12-03
EP0107044A3 (en) 1986-03-12
EP0107044A2 (en) 1984-05-02
JPS5992038A (en) 1984-05-28

Similar Documents

Publication Publication Date Title
CN100482350C (en) Composite-material abrasive roller of tungsten carbide grain reinforced metal base and its production
US4848683A (en) Crushing members used in pulverizers
EP0192972B1 (en) Highly abrasive resistant material
EP0107044B1 (en) Bull ring for a coal pulverizer
US4242002A (en) Agitator means for tower type abrasion mills
US3929296A (en) Striking tool
CN110369050A (en) All-sealed tumbling ball mill
JP2764612B2 (en) Roller mill
US4389767A (en) Method of manufacturing pulverizer rolls
CA1212365A (en) Trimetal pulverizer roll and a method of manufacture thereof
EP0234026A2 (en) Articles embodying a wear resistant surface layer and a method of manufacture thereof
CA1311232C (en) Pulverizer having rotatable grinding table with replaceable air port segments
CN211886658U (en) High-efficient wheel grinds device for refractory material compounding
CN220405904U (en) Novel frame body abrasionproof welt in coal pulverizer
CN110813453A (en) A ball mill for fireworks aluminite powder production
US4610401A (en) Trimetal pulverizer roll
CN214439542U (en) Wear-resisting scraper for pulverizer
JP3147136B2 (en) Vertical crusher
JPH04106632U (en) Vertical crusher
JPH057345U (en) Grinding roller for vertical mill
JP2558521Y2 (en) Crusher rotor structure
SU1375317A1 (en) Feed distributor for cone-type crusher
JP2500793Y2 (en) Roller for Roller Mill
JPS62183856A (en) Structure of connecting section of interlocking plate for jaw crusher
JPH04905Y2 (en)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE DE FR GB IT NL SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: LUMMUS CREST S.A.R.L.

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): BE DE FR GB IT NL SE

17P Request for examination filed

Effective date: 19860827

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: LUMMUS CREST SARL

17Q First examination report despatched

Effective date: 19870522

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE FR GB IT NL SE

RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: COMBUSTION ENGINEERING, INC.

REF Corresponds to:

Ref document number: 3379103

Country of ref document: DE

Date of ref document: 19890309

ITF It: translation for a ep patent filed
ET Fr: translation filed
NLT2 Nl: modifications (of names), taken from the european patent patent bulletin

Owner name: COMBUSTION ENGINEERING, INC. TE WINDSOR, CONNECTIC

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

BECN Be: change of holder's name

Effective date: 19890201

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19930623

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19930630

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19930701

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19930702

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19930729

Year of fee payment: 11

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19930930

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19940921

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19940922

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19940930

EAL Se: european patent in force in sweden

Ref document number: 83109386.9

BERE Be: lapsed

Owner name: COMBUSTION ENGINEERING INC.

Effective date: 19940930

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19950401

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19940921

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19950531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19950601

EUG Se: european patent has lapsed

Ref document number: 83109386.9

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST