EP0196486A1 - Vorrichtung zur Beschickung eines Schachtofens - Google Patents

Vorrichtung zur Beschickung eines Schachtofens Download PDF

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Publication number
EP0196486A1
EP0196486A1 EP86102912A EP86102912A EP0196486A1 EP 0196486 A1 EP0196486 A1 EP 0196486A1 EP 86102912 A EP86102912 A EP 86102912A EP 86102912 A EP86102912 A EP 86102912A EP 0196486 A1 EP0196486 A1 EP 0196486A1
Authority
EP
European Patent Office
Prior art keywords
hopper
airlocks
installation according
vertical axis
chamber
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.)
Granted
Application number
EP86102912A
Other languages
English (en)
French (fr)
Other versions
EP0196486B1 (de
Inventor
René Mahr
Emile Lonardi
Gilbert Bernard
Marc Solvi
Pierre Mailliet
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.)
Paul Wurth SA
Original Assignee
Paul Wurth SA
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 Paul Wurth SA filed Critical Paul Wurth SA
Priority to AT86102912T priority Critical patent/ATE37200T1/de
Publication of EP0196486A1 publication Critical patent/EP0196486A1/de
Application granted granted Critical
Publication of EP0196486B1 publication Critical patent/EP0196486B1/de
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/20—Arrangements of devices for charging
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/18—Bell-and-hopper arrangements
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/18—Bell-and-hopper arrangements
    • C21B7/20—Bell-and-hopper arrangements with appliances for distributing the burden

Definitions

  • the present invention relates to a loading installation of a shaft furnace comprising a distribution device with a rotary or oscillating chute, a storage hopper mounted on the vertical axis of the furnace and whose flow orifice towards the chute is controlled by a metering member designed so as to enlarge and reduce the flow section symmetrically around said vertical axis.
  • the object of the present invention is to provide a new installation for loading a shaft furnace of the kind described in the preamble, which includes means for effectively reducing segregation.
  • the loading installation according to the present invention is characterized in that the storage hopper and the metering member are movable around the vertical axis and are mounted inside a sealed chamber which is surmounted by at least two airlocks each provided with upper and lower sealing valves and in that the hopper and the bottom of each of the airlocks are in the form of tapered funnels whose conical wall makes an angle less than or equal to 30 ° with the vertical axis of the oven.
  • Said chamber is preferably surmounted by three airlocks in order to allow a reduction in the capacity of each of them and also to ensure better continuity of loading, i.e. to minimize downtime.
  • the maximum diameter of each airlock is preferably less than three meters.
  • the storage hopper is preferably carried by rollers of the support and guide which evolve on a circular rail secured to the wall of the sealed chamber and undergoes the action of a drive mechanism. to rotate it around the vertical axis of the oven.
  • Anti-segregation boxes are preferably provided both in the airlocks and in the hopper in order to ensure better filling and, above all, to guarantee a more uniform distribution of the particles of different particle size.
  • the invention therefore provides several effective measures making it possible to reduce segregation or its effects, namely the small diameter of the airlocks and of the hopper, as well as their tapered shape, the rotation of the hopper about the vertical axis, as well as anti-segregation boxes.
  • Figure la shows a horizontal section along the cutting plane a-a of Figure 1 and
  • Figure 4 shows a chronological diagram of the different loading operations.
  • FIGS 1 to 3 show, in principle, the same loading installation which is carried by a frame 10 itself supported by the head of a shaft furnace 12 in which is mounted a rotating or oscillating chute 14 for distributing the material loading.
  • a storage hopper 16 is mounted symmetrically around the vertical axis 0 of the oven, above a vertical feed channel 18 opening onto the chute 14. According to one of the features of the invention, this hopper 16 has the shape of a tapered funnel whose conical wall makes an angle less than or equal to 30 ° with the axis 0 and whose maximum diameter does not exceed step 4 to 5 meters at its top.
  • the storage hopper 16 is covered by a sealed chamber 20 carried by the frame 10. According to another feature of the invention, the hopper 16 can rotate inside the chamber 20 around the vertical axis O. At this Indeed, the hopper 16 is provided with several, eg four rollers 22 which evolve on a circular rail 26 and on an inner shoulder of the chamber 20. Other rollers 24 with vertical axis of rotation ensure the horizontal maintenance while moving on an inner edge of the rail 26.
  • the hopper 16 is extended downwards by a drainage tube 28 provided with a metering valve 30 for regulating the flow of the loading material from the hopper 16 on the chute 14.
  • the valve 30 consists of two registers , preferably in the form of a cap, which open and open in synchronism and in opposite directions with respect to the axis so as to define a symmetrical flow opening around the axis O.
  • the operation of these registers can be carried out , in a manner known per se, by an annular rail 32 which can be mounted and lowered from the outside and in which evolve guide rollers mounted on the arms of each of the registers, this to allow the valve to be maneuvered during the rotations of the hopper 16 by vertical displacement of the rail 32.
  • the bottom thereof is also funneled to form above the tube 28 a constriction 34 as narrow as possible between the wall of the chamber 20 and that of the hopper 16. It is possible to provide this throttle 34 with a friction flap to avoid the passage of gases as much as possible. As an alternative solution, it is possible to send an inert gas under pressure to the chamber 20 in order to create, through the throttle 34, a downward flow in the opposite direction which prevents the ascent. gases.
  • the chamber 20 is surmounted, in the example shown, by a triangular arrangement of three individual airlocks 36,38,40 (the airlock 40 is not visible in the figure) supported individually by the chain: - slope.
  • Communication between each of the airlocks 36,38 and 40 and the hopper 16 is carried out respectively through valve cages 42,44,46 (see also FIG. La) which each contain a metering valve 48 and a sealing valve 50.
  • the metering valve 48 is also preferably made up of two spherical registers, pivoting by symmetrical action around the vertical axis of each airlock. This valve 48 as well as the lower tubing of the airlocks with which it cooperates are preferably as wide as possible in order to ensure rapid flow of the airlocks towards the hopper 16.
  • Each of the airlocks 36, 38 and 40 must also be provided with an upper sealing valve 52 to allow the pressurization of the airlocks during the flow of the material towards the hopper as well as their aeration during loading.
  • a waterproof compensator 54 Between the chamber 20 and the head of the oven 12 is a waterproof compensator 54.
  • waterproof compensators 56 are located between the chamber 20 and each of the valve cages 42,44,46. These compensators 54 and 56 make it possible to individually weigh the chamber 20 with the hopper 16 as well as each of the airlocks 36, 38 and 40. The weighing is carried out, in a manner known per se, by stress cells shown diagrammatically at 58 and 60 and carrying respectively the chamber 20, as well as each of the locks 36,38 and 40. Thanks to these individual weighings one can determine the content of the hopper 16 as well as that of each of the locks 36,38 and 40 in order to automatically control the opening valves for filling and emptying these tanks.
  • the loading material of the oven is arenc-e by a conveyor belt 62 which pours it, in the mode of embodiment of FIG. 1, in a holding hopper 64 whose flow is controlled by the valve 66. Below this hopper 64 is a rotating chute 68 which successively ensures the connection between the hopper 64 and each of the airlock 36,38 and 40.
  • the conveyor belt 62 also pours the loading material into a holding hopper 70.
  • the chute of FIG. 1 is replaced by three fixed tubes 72 connecting the hopper 70 to each of the airlocks 36, 38 and 40.
  • Each of these pipes 72 is associated in the example shown with a valve 74 ⁇ 3 e closing and opening.
  • a valve 74 ⁇ 3 e closing and opening instead of providing three valves, it is possible to provide a single valve at the intersection of the pipes 72 and the hopper 70. This arrangement also allows complete emptying of the pipes 72.
  • the conveyor belt 62 also pours the loading material into a holding hopper 76 whose flow opening is controlled by a valve 78. From the hopper 76 the loading material falls on a second conveyor belt 80 which is mounted in a frame 82 capable of pivoting about an axis parallel to the central vertical axis 0.
  • This second conveyor belt 80 is, moreover, retractable and, for this purpose, the roller front deflection 84 can slide in the longitudinal direction under the action of a jack 86, the length of the conveyor belt being compensated for by a free sliding roller 88. In this way, the conveyor belt 80 can discharge the material loading in each airlock 36,38 and 40.
  • the main objective of the invention is to eliminate segregation or, at least, to mitigate its effects.
  • One of the factors contributing to the achievement of this objective is the replacement of the single large-capacity hopper. cited in document EP-A-0062770 by four small diameter enclosures. For example in a mode
  • each of the airlocks 36, 38 and 40 as well as that of the hopper 16 is only 20 m 3 against 80 m 3 for the aforementioned document.
  • each of the airlocks and the hopper 16 have a very tapered shape, the angle of their conical wall with the vertical axis not exceeding 30 0 .
  • the ideal would be, by the way, downright tubular enclosures whose section is equal to the section of the flow tubing. However, this is difficult to achieve because of the resulting increase in height. It is therefore necessary to find a compromise between the available height and the section of the airlocks and the storage hopper.
  • an anti-segregation box 90 known per se has been mounted. Such a box reduces segregation during filling and promotes a more uniform flow during emptying.
  • a central anti-segregation box 94 and, in addition, an upper annular box 92. These boxes reduce the rolling of the particles and promote the projection of fines against the wall whereas, without the presence of the box, these tend to accumulate along the 0 axis.
  • the rotation of the hopper 16 also attenuates segregation to a certain extent. However, the main purpose of this rotation is to ensure correct filling of the hopper 16. This rotation, which takes place at a speed of 6 to 8 revolutions per minute, allows the contents of an airlock to be deposited in the hopper 16 along the loading line 96 with only a slight dip in the central region.
  • the loading diagram in Figure 4 is actually an overlay of 4 graphics on the same time base.
  • Graph I shows the successive phases lasting 265 seconds each of the alternative loads of coke and ore.
  • Graph II represents the emptying of the three airlocks which were no longer represented by their serial numbers 36, 38 and 40, but, for the sake of convenience by the letters A, B, C.
  • Graph III represents the loading of the three airlocks A, B and C, while Graph IV represents the supply of coke and ore by means of the conveyor belt 62.
  • the first 13 seconds are reserved for opening the metering valves 30 to a position corresponding to a flow rate of 0.335 m 3 per second of loading material.
  • the airlock and metering valves of the airlock A are open and during these 13 seconds the content of this airlock A is completely transferred into the hopper 16 (see graph II).
  • the filling of airlock B ends and the filling of airlock C begins (see graph III) while the supply of a continuous layer of 80 m 3 by the conveyor belt continues (see graph IV).
  • the flow of coke begins on the distribution chute at a rate of 0.335 m 3 per second.
  • the airlock A which is now emptied of its contents can be prepared for a next filling.
  • its metering valve and its lower sealing valve are closed and ventilation is carried out.
  • the content of the airlock B is also transferred in the hopper 16 in 13 seconds while the flow thereof continues.
  • the filling of the airlock C which also continues comes to an end and as soon as this one is filled, the airlock A whose upper sealing valve has just been opened now receives the last twenty m 3 of coke from the conveyor belt .
  • the airlock C is pressurized and as soon as the level of the hopper 16 has fallen sufficiently low the content of the airlock C is transferred to the hopper.
  • the airlock A is also pressurized, with a view to transferring its content into the hopper 16.
  • These 80 In3 of coke are deposited after 252 seconds in a uniform layer of one meter in a concentric circle from the outside towards the center of the loading surface. After these 252 seconds the valve 30 of the hopper 16 is closed to prepare the ore loading cycle.
  • This ore loading cycle has in fact already started at a higher level, by the ascent by the conveyor 62 of a sheet of 80 m 3 of ore and the filling of the airlocks B and C.
  • the ore content is transferred for 13 seconds from the airlock B to the hopper 16 and at the same time the opening of the metering valves is adjusted to a position d flow corresponding to a flow of 0.335 m 3 per second. While the airlock B is emptied, the operation of filling the airlock C ends and the filling of the airlock A with ore begins. After 13 seconds of the second cycle, loading of ore begins. This loading is analogous to loading with coke, that is to say that the contents of the airlocks BC, A and B are successively emptied each time the weighing of the hopper 16 provides the demand.
  • FIG. 4 reveals another advantage of the device according to the invention compared to the known device described in the aforementioned European patent application. Indeed, as shown in graph I, the loading is almost continuous, the only interruption being the stop of 26 seconds between each cycle for the operation of the hopper valve. In any case, it is difficult to carry out a continuous loading at 100% since after the deposition of each layer it is necessary to cut the loading to straighten the chute and start a new layer at the periphery.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Blast Furnaces (AREA)
  • Heat Treatment Of Articles (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Constitution Of High-Frequency Heating (AREA)
EP86102912A 1985-03-15 1986-03-05 Vorrichtung zur Beschickung eines Schachtofens Expired EP0196486B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86102912T ATE37200T1 (de) 1985-03-15 1986-03-05 Vorrichtung zur beschickung eines schachtofens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU85811 1985-03-15
LU85811A LU85811A1 (fr) 1985-03-15 1985-03-15 Installation de chargement d'un four a cuve

Publications (2)

Publication Number Publication Date
EP0196486A1 true EP0196486A1 (de) 1986-10-08
EP0196486B1 EP0196486B1 (de) 1988-09-14

Family

ID=19730425

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86102912A Expired EP0196486B1 (de) 1985-03-15 1986-03-05 Vorrichtung zur Beschickung eines Schachtofens

Country Status (14)

Country Link
US (1) US4728240A (de)
EP (1) EP0196486B1 (de)
JP (1) JPH0735524B2 (de)
KR (1) KR930009385B1 (de)
CN (1) CN1004230B (de)
AT (1) ATE37200T1 (de)
BR (1) BR8601267A (de)
CA (1) CA1263231A (de)
DE (1) DE3660723D1 (de)
IN (1) IN164440B (de)
LU (1) LU85811A1 (de)
PL (1) PL155071B1 (de)
SU (1) SU1498395A3 (de)
UA (1) UA8328A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2595456A1 (fr) * 1986-03-04 1987-09-11 Wurth Paul Sa Installation de chargement d'un four a cuve
FR2613049A1 (fr) * 1987-03-24 1988-09-30 Wurth Paul Sa Charpente de support d'une installation de chargement d'un four a cuve
FR2636726A1 (fr) * 1988-09-22 1990-03-23 Wurth Paul Sa Installation de chargement d'un four a cuve
EP0400309A2 (de) * 1989-06-02 1990-12-05 Maerz Ofenbau AG Beschickungsvorrichtung zur wechselweisen Einfüllung und Verteilung von Feststoffen zweier Kornklassen
CN102472584A (zh) * 2009-07-06 2012-05-23 西门子公司 用于定位原料篮的装置

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US4917560A (en) * 1989-01-19 1990-04-17 Cmi Corporation Twin bin self erect silo
US5458450A (en) * 1993-05-07 1995-10-17 Exxon Chemical Patents Inc. Pressure-vacuum rated flexible connector for use in material handling systems
LU88429A1 (fr) * 1993-11-23 1995-07-10 Wurth Paul Sa Dispositif de chargement d'un four à cuve
US5494263A (en) * 1994-03-07 1996-02-27 Centro De Investigacion Y Asistencia Tecnica Del Edo. De Qro, A.C. System for solid material charging into vertical reactors by electronic control of the exhaust gases
LU88494A1 (fr) * 1994-06-08 1996-02-01 Wurth Paul Sa Dispositif de chargement à goulotte rotative pour un four à cuve
DE10153425A1 (de) * 2001-11-03 2003-05-15 Pfister Gmbh Verfahren und Vorrichtung zum gravimetrischen Dosieren von Schüttgut
AT412786B (de) * 2003-07-04 2005-07-25 Voest Alpine Industrieanalgenb Verfahren zum chargieren von schüttfähigem material und vorrichtung zur durchführung des verfahrens
FI118438B (fi) * 2004-09-09 2007-11-15 Outotec Oyj Kuuman syötteen jakolaite
RU2279484C1 (ru) * 2005-02-07 2006-07-10 Общество С Ограниченной Ответственностью "Исследовательско-Технологический Центр "Аусферр" Устройство для подачи компонентов при прямом легировании стали
AT502479B1 (de) * 2005-10-24 2007-04-15 Voest Alpine Ind Anlagen Verfahren und vorrichtung zum chargieren von einsatzstoffen
LU91217B1 (fr) * 2006-01-20 2007-07-23 Wurth Paul Sa Dispositif de chargement d'un four à cuve
EP1811044A1 (de) * 2006-01-20 2007-07-25 Paul Wurth S.A. Dreifacher Fülltrichter eines Schachtofens
EP1811045A1 (de) * 2006-01-20 2007-07-25 Paul Wurth S.A. Mehrfacher Fülltrichter eines Schachtofens
US7762290B2 (en) * 2008-11-06 2010-07-27 Poet Research, Inc. System for loading particulate matter into a transport container
LU91558B1 (en) * 2009-04-28 2010-10-29 Wurth Paul Sa Method for feeding a burden to a blast furnace
LU91559B1 (en) * 2009-04-28 2010-10-29 Wurth Paul Sa Method for feeding a burden to a blast furnace
LU91800B1 (en) * 2011-03-28 2012-10-01 Wurth Paul Sa Charging installation of a shaft furnace and method for charging a shaft furnace
AT511797B1 (de) * 2011-09-22 2013-03-15 Siemens Vai Metals Tech Gmbh Vorrichtung zur zufuhr von energieträgern, eisenträgern sowie zusatzstoffen auf die oberfläche eines festbettes
CN103423991B (zh) * 2012-05-18 2015-02-04 中国有色（沈阳）冶金机械有限公司 一种镁冶炼操作机组加料车
KR101534126B1 (ko) * 2014-03-06 2015-07-06 주식회사 포스코 원료 장입 장치 및 원료 장입 방법
CN104914006B (zh) * 2015-05-22 2017-10-17 东北大学 一种用于测量散粒体在筒仓中流动规律的实验装置及实验方法
CN112029945A (zh) * 2020-09-03 2020-12-04 赫章县黎明矿业有限公司 一种新型有烟煤焙烧菱铁矿的竖炉

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2093682A5 (de) * 1970-05-27 1972-01-28 Wurth Paul
US3780890A (en) * 1972-03-01 1973-12-25 Mckee A & Co Furnace charging apparatus
US4029220A (en) * 1975-11-28 1977-06-14 Greaves Melvin J Distributor means for charging particulate material into receptacles
LU80646A1 (fr) * 1978-12-12 1979-04-13 Wurth Anciens Ets Paul Dispositif de chargement d'un four a cuve
LU84015A1 (fr) * 1982-03-15 1983-11-17 Wurth Paul Sa Dispositif de controle de l'ecoulement de la matiere de chargement d'une enceinte de stockage dans une installation de chargement d'un four a cuve

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US3796419A (en) * 1971-04-15 1974-03-12 Mc Kee A & Co Charging apparatus for shaft furnaces
US3706387A (en) * 1972-01-17 1972-12-19 Mohr & Sons John Blast furnace charging apparatus for high top pressure
US3929240A (en) * 1972-07-05 1975-12-30 Wurth Anciens Ets Paul Shaft furnace charging process
JPS5825724B2 (ja) * 1973-11-01 1983-05-30 ア−サ− ジ− マツキ− アンド カンパニ− チヨクリツロヘノゲンザイリヨウソウニユウホウウ オヨビ ソノソウニユウソウチ
JPS576516Y2 (de) * 1977-09-03 1982-02-06
LU80630A1 (fr) * 1978-12-08 1979-04-09 Wurth Anciens Ets Paul Procede et installation de chargement d'un four a cuve
LU82840A1 (fr) * 1980-10-10 1981-02-02 Wurth Anciens Ets Paul Perfectionnements aux installations d'alimentation des fours a cuve a gueulard sans cloche
SE441865B (sv) * 1981-03-10 1985-11-11 Skf Steel Eng Ab Anordning for att uppifran tillfora styckeformigt material till ett schakt
LU83279A1 (fr) * 1981-04-03 1983-03-24 Wurth Paul Sa Installation de chargement d'un four a cuve
JPS6031065Y2 (ja) * 1983-01-07 1985-09-18 新日本製鐵株式会社 複数個の上部ホツパーを持つベルレス装入装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2093682A5 (de) * 1970-05-27 1972-01-28 Wurth Paul
US3780890A (en) * 1972-03-01 1973-12-25 Mckee A & Co Furnace charging apparatus
US4029220A (en) * 1975-11-28 1977-06-14 Greaves Melvin J Distributor means for charging particulate material into receptacles
LU80646A1 (fr) * 1978-12-12 1979-04-13 Wurth Anciens Ets Paul Dispositif de chargement d'un four a cuve
LU84015A1 (fr) * 1982-03-15 1983-11-17 Wurth Paul Sa Dispositif de controle de l'ecoulement de la matiere de chargement d'une enceinte de stockage dans une installation de chargement d'un four a cuve

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Title
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2595456A1 (fr) * 1986-03-04 1987-09-11 Wurth Paul Sa Installation de chargement d'un four a cuve
BE1000193A3 (fr) * 1986-03-04 1988-08-23 Wurth Paul Sa Installation de chargement d'un four a cuve.
FR2613049A1 (fr) * 1987-03-24 1988-09-30 Wurth Paul Sa Charpente de support d'une installation de chargement d'un four a cuve
FR2636726A1 (fr) * 1988-09-22 1990-03-23 Wurth Paul Sa Installation de chargement d'un four a cuve
BE1004404A3 (fr) * 1988-09-22 1992-11-17 Wurth Paul Sa Installation de chargement d'un four a cuve.
EP0400309A2 (de) * 1989-06-02 1990-12-05 Maerz Ofenbau AG Beschickungsvorrichtung zur wechselweisen Einfüllung und Verteilung von Feststoffen zweier Kornklassen
EP0400309A3 (de) * 1989-06-02 1991-04-03 Maerz Ofenbau AG Beschickungsvorrichtung zur wechselweisen Einfüllung und Verteilung von Feststoffen zweier Kornklassen
CN102472584A (zh) * 2009-07-06 2012-05-23 西门子公司 用于定位原料篮的装置
CN102472584B (zh) * 2009-07-06 2014-06-25 西门子公司 用于定位原料篮的装置

Also Published As

Publication number Publication date
IN164440B (de) 1989-03-18
EP0196486B1 (de) 1988-09-14
KR930009385B1 (ko) 1993-10-02
UA8328A1 (uk) 1996-03-29
BR8601267A (pt) 1986-12-02
CA1263231A (en) 1989-11-28
CN1004230B (zh) 1989-05-17
JPS61264113A (ja) 1986-11-22
PL155071B1 (en) 1991-10-31
LU85811A1 (fr) 1986-10-06
DE3660723D1 (en) 1988-10-20
SU1498395A3 (ru) 1989-07-30
KR860007384A (ko) 1986-10-10
CN86101639A (zh) 1986-12-03
US4728240A (en) 1988-03-01
JPH0735524B2 (ja) 1995-04-19
ATE37200T1 (de) 1988-09-15

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