EP0038794A2 - Installation de broyage - Google Patents

Installation de broyage Download PDF

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Publication number
EP0038794A2
EP0038794A2 EP81890069A EP81890069A EP0038794A2 EP 0038794 A2 EP0038794 A2 EP 0038794A2 EP 81890069 A EP81890069 A EP 81890069A EP 81890069 A EP81890069 A EP 81890069A EP 0038794 A2 EP0038794 A2 EP 0038794A2
Authority
EP
European Patent Office
Prior art keywords
discharge chamber
grinding drum
grinding
discharge
discharge opening
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
EP81890069A
Other languages
German (de)
English (en)
Other versions
EP0038794B1 (fr
EP0038794A3 (en
Inventor
Gerhard Frenzel
Franz Scheucher
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.)
Austroplan Osterreichische Planungsgesellschaft Mbh
Original Assignee
Austroplan Osterreichische Planungsgesellschaft Mbh
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 Austroplan Osterreichische Planungsgesellschaft Mbh filed Critical Austroplan Osterreichische Planungsgesellschaft Mbh
Publication of EP0038794A2 publication Critical patent/EP0038794A2/fr
Publication of EP0038794A3 publication Critical patent/EP0038794A3/de
Application granted granted Critical
Publication of EP0038794B1 publication Critical patent/EP0038794B1/fr
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
    • B02C21/00—Disintegrating plant with or without drying of the material
    • 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
    • B02C17/04—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 with unperforated container
    • 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
    • B02C17/18—Details

Definitions

  • the invention relates to a grinding system with a rotating, lying arranged grinding drum, at one end of which there is an axial inlet opening and at the other end of which an axial discharge opening is provided, the grinding system being a conveying device which conveys the material to be ground from the discharge opening of the grinding drum to a level above the discharge opening having.
  • the ground material emerges from the grinding drum around the radius of the discharge opening below the central axis of the grinding drum, which makes it difficult to convey the ground material further to other downstream machines downstream of the grinding drum.
  • the regrind is to be conveyed from the discharge opening, for example to a wind sifter, in a grinding system with a closed circuit, the regrind has to be conveyed from the discharge opening of the grinding drum to the intake opening of the wind sifter by means of a bucket elevator.
  • a bucket elevator is not only energy-intensive - the regrind is moved vertically over a very long conveyor length - but also requires a hall of a specific design with a foundation pit and with at least one floor above the grinding drum. Ahlstrom for maintenance and repairs to such M are needed on each floor own mounting alskräne l, the construction and investment costs so that when this system is very large.
  • the invention aims at avoiding these disadvantages and difficulties and has as its object to provide an M ahlstrom of the initially described type to create, in which it is possible the grinding drum downstream of downstream equipment smaller on .
  • Participants level as the grinding drum and together with the grinding drum on as Arrange the base area and thus enable minimal conveying path lengths for the regrind.
  • the discharge opening opens into a discharge chamber which rotates about an approximately horizontal axis and has a rotationally symmetrical design, the jacket parts of which convey the ground material extend from a level below to a level above the discharge opening and the discharge chamber above the discharge opening is a removal device for the regrind.
  • the discharge chamber By this discharge chamber, the discharge of the ground material is allowed above the discharge of the grinding drum, so that the ground material, without a loading c herwerk to need, can be conveyed to the downstream of the grinding drum downstream machines.
  • the grinding system according to the invention therefore makes it possible to set up a sifter arranged downstream of the grinding drum directly next to the grinding drum and at the same level as this, so that it can be found with a hall with a small footprint and without a floor above a hallway. Furthermore, the entire system can be easily maintained using a single overhead traveling crane, which reduces investment costs and significantly reduces repair times.
  • the classifier immediately bar next to the grinding drum there is a very short conveying path length between the grinding drum and classifier, which also reduces the energy requirement compared to conventional grinding systems.
  • the discharge chamber is preferably arranged coaxially with the grinding drum, is overhung on the grinding drum and is fixed to it in a rotationally fixed manner.
  • the discharge chamber has a larger, preferably at least more than 1.75 times larger diameter than the grinding drum.
  • Grinding drums are operated at a speed at which the centrifugal force acting on the ground material or the grinding elements provided inside the drum is lower in the upper region of the drum than the radially directed component of the gravity of the grinding material or the grinding elements.
  • the grinding media and regrind particles located in the grinding drum detach from the drum wall and, after being conveyed upwards by the drum, fall down.
  • the diameter of the discharge chamber is larger than that of the grinding drum, then (ßb a certain diameter), the larger centrifugal force caused by the larger radius causes the material to be grounded against the lateral surfaces of the discharge chamber also above the axis of rotation, i.e. that the regrind is conveyed with certainty to the highest point of the discharge chamber, without special installations in the discharge chamber being required.
  • a stationary scraper protrudes from the front of the discharge chamber into the interior of the discharge chamber in its part located above the discharge opening, with scraper edges of the scraper are arranged at a short distance from the jacket parts of the discharge chamber which convey the regrind.
  • An expedient embodiment of the system is characterized in that the end face of the discharge chamber is provided with a cover which is arranged in a stationary manner and is sealed off from the rotating discharge chamber and has a discharge opening for the regrind, and that the scraper is fastened to the cover at the discharge opening.
  • the discharge chamber has a smaller diameter than is required for conveyance by means of centrifugal force, it is cup-shaped in the discharge chamber at the lateral surfaces thereof, ending at a distance from the discharge opening Arrange blades and let a continuous conveyor protrude into the interior of the discharge chamber for the removal of the material conveyed by the blades.
  • FIGS. 1 and 2 in a schematic representation of a grinding plant with a closed circuit of conventional design in side and end view together with the hall shown in section
  • FIGS. 3 and 4 a grinding plant according to the invention also in side view. and show front view of the hall shown in cross-section.
  • Fig. 5 illustrates the discharge chamber in section along the line V-V of Fig. 4.
  • Fig. 6 shows the material flow within the discharge chamber. 7 shows another embodiment of the discharge chamber.
  • the material to be ground (raw material) is conveyed via a conveyor belt 1 to a feed lock 2, from which the raw material flows through an axial inlet opening 3 into the cylindrical grinding drum 4.
  • the grinding drum 4 is rotatably mounted with respect to the foundation 7 by means of two hollow end journals, also called neck bearings 5, 6, formed with a smaller radius than the grinding drum, and by means of a pinion 10 driven by an electric motor 8 via a gear 9, which in a on the jacket the grinding drum 4 engages peripherally arranged ring gear 11, driven.
  • the ground goods are left after leaving the grinding drum 4 is passed through an axial discharge opening 12 via an air conveyor trough 13 to a vertical conveyor 14 which is designed as a bucket elevator.
  • This bucket elevator 14 is set up in a foundation pit 15 and conveys the ground material to a floor 16 above the grinding drum 4. From this bucket elevator 14, the ground material is fed to an air classifier 17, from which, after separation of the ground material into coarse and fine material (finished product ) the coarse material is in turn fed to the feed lock 2 by means of a conveyor device 18, whereas the fine material leaves the grinding system by means of a continuous conveyor 19.
  • the classifier could also be a cyclone air classifier.
  • a grinding plant according to the invention is shown.
  • the grinding drum and its drive are designed essentially the same as in the known system.
  • the discharge opening in the system according to the invention opens into a discharge chamber 20 which is arranged coaxially with the grinding drum 4 and is rotatably connected to it and therefore rotates together.
  • the discharge chamber is designed to be rotationally symmetrical and has a conically widening inlet part 21, an adjoining jacket 22 which extends in the radial direction and a cylindrical jacket 23 extending from the circumference of this jacket, which at its outer end, ie on the end face 24 of the discharge chamber, has an annular, radially, inwardly extending board 25 is provided.
  • the discharge chamber 20 is provided with a stationary cover 27 which is mounted on a stationary frame 26 and which has a central opening 28 for the removal of air or other gases (vapors) which is (are) sucked off via a line 29.
  • the stationary cover has a cylindrical rim 30, which is opposite the radially inward rim 25 of the discharge chamber by means of a seal, not shown, for example a laby Rinth seal is largely sealed against sucked-in false air.
  • the stationary cover 27 Above the discharge opening 12 of the grinding drum 4, the stationary cover 27 has a discharge opening 31 for the ground material. Laterally next to the discharge opening 31, a scraper 32 is mounted on the stationary cover 27, which has scraper edges 33 which are at a short distance 34 from the radial and cylindrical jacket 22, 23.
  • An air conveyor trough 35 is connected to the discharge opening 31, in which the ground material arrives at a diaphragm 36.
  • a channel 37 is provided below the diaphragm for the supply of compressed air.
  • the ground material itself is fed in the conveying channel 38 arranged above the diaphragm by means of the compressed air passing through the diaphragm to a wind sifter 17 arranged directly next to the grinding drum 4, ie at approximately the same level.
  • the ground material is sifted into coarse and finished material.
  • the coarse material in turn is conveyed to the feed lock 2 of the grinding drum 4 by means of a conveyor device 39, which is preferably designed as a conveyor belt.
  • all system parts are arranged on the hallway 41 and can be operated by means of a single overhead traveling crane 42 in the event of a repair, etc.
  • the length 43 and width 44 of the hall corresponds approximately to the length 43 and width 44 of a hall of a known system having the same power, as is shown in FIGS. 1 and 2.
  • the function of the discharge chamber 20 is as follows: the grinding drum 4 rotates at a subcritical speed n, ie the grinding material is accelerated when the mill rotates due to friction on the grinding drum and is carried up by the centrifugal force on the drum casing. Once the radially directed component of gravity is larger than the centri force, the grinding media and regrind particles loosen from the drum wall and fall down again.
  • the diameter D of the discharge chamber 20 is designed according to the invention such that the centrifugal force acting on the cylindrical jacket 23 of the discharge chamber 20 is always greater than the radially directed component of gravity, as a result of which the ground material emerging through the discharge opening 12 from the grinding drum 4 initially due to the effect of gravity reaches the peripheral jacket parts 22, 23, 25 of the discharge chamber 20 and then adheres to them as a result of the centrifugal force until it is raised to the stripper 32 provided above the discharge opening., The stripper 32 detaches the ground material from the jacket parts 22, 23, 25 of the discharge chamber 20, after which the regrind is conveyed through the discharge opening 31 to the air conveyor trough 35.
  • the minimum diameter D min for the discharge chamber can be calculated from the critical speed n crit ' at which the material adheres to the cylindrical surface and the diameter d of the grinding drum as follows:
  • the speed n of a mill is calculated according to the formula and the critical speed n crit is estimated from the formula calculated.
  • Another advantage of the system according to the invention is that the discharge chamber 20, which has a larger diameter D than the discharge opening 12, greatly reduces the flow velocity of the gases emerging from the discharge opening 12. As a result, easy separation of the dust-like ground material from the vapors and thus relief of the dedusting units is granted.
  • FIG. 7 shows a variant 46 of the discharge chamber according to the invention, in which the diameter is selected so that the material does not adhere to the cylindrical lateral surface due to the centrifugal force.
  • the regrind is conveyed up here by means of cup-shaped blades 47, which are fastened to the cylindrical or radial lateral surface, and slips from the blades as soon as they have reached their uppermost position, onto an air conveyor trough projecting into the interior of the discharge chamber 46 through a discharge opening 48, the ATE M rial similar to the embodiment shown in FIGS. 3 and 4 promotes plant to an air classifier.
  • the diameter of the discharge chamber 46 can be kept as small as possible (also smaller than the diameter d of the grinding drum); the minimum diameter is only determined by the necessary delivery head that the regrind has to travel from the discharge opening to the air classifier. For this reason, this embodiment is particularly suitable for slow-running grinding drums with large diameters.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP19810890069 1980-04-24 1981-04-22 Installation de broyage Expired EP0038794B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT220680A AT366595B (de) 1980-04-24 1980-04-24 Mahlanlage
AT2206/80 1980-04-24

Publications (3)

Publication Number Publication Date
EP0038794A2 true EP0038794A2 (fr) 1981-10-28
EP0038794A3 EP0038794A3 (en) 1981-12-30
EP0038794B1 EP0038794B1 (fr) 1984-10-31

Family

ID=3529974

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810890069 Expired EP0038794B1 (fr) 1980-04-24 1981-04-22 Installation de broyage

Country Status (7)

Country Link
EP (1) EP0038794B1 (fr)
JP (1) JPS5735946A (fr)
AT (1) AT366595B (fr)
DE (1) DE3166909D1 (fr)
DK (1) DK184781A (fr)
ES (1) ES501643A0 (fr)
IN (1) IN155719B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115888959A (zh) * 2022-11-24 2023-04-04 临沂会宝岭铁矿有限公司 一种铁矿抑尘破碎装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE697940C (de) * 1939-09-03 1940-10-28 Polysius Akt Ges G Austragvorrichtung fuer umlaufende Trockentrommeln o. dgl.
DE1128267B (de) * 1958-10-29 1962-04-19 Polysius Gmbh Mahltrocknungsanlage mit mechanischem Guttransport
DE1200655B (de) * 1961-06-29 1965-09-09 Ind G M B H Anlage zum Mahlen und Trocknen von Zement-rohgut

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE697940C (de) * 1939-09-03 1940-10-28 Polysius Akt Ges G Austragvorrichtung fuer umlaufende Trockentrommeln o. dgl.
DE1128267B (de) * 1958-10-29 1962-04-19 Polysius Gmbh Mahltrocknungsanlage mit mechanischem Guttransport
DE1200655B (de) * 1961-06-29 1965-09-09 Ind G M B H Anlage zum Mahlen und Trocknen von Zement-rohgut

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115888959A (zh) * 2022-11-24 2023-04-04 临沂会宝岭铁矿有限公司 一种铁矿抑尘破碎装置
CN115888959B (zh) * 2022-11-24 2023-06-27 临沂会宝岭铁矿有限公司 一种铁矿抑尘破碎装置

Also Published As

Publication number Publication date
ES8300504A1 (es) 1982-11-01
DK184781A (da) 1981-10-25
IN155719B (fr) 1985-02-23
ATA220680A (de) 1981-09-15
ES501643A0 (es) 1982-11-01
JPS5735946A (ja) 1982-02-26
AT366595B (de) 1982-04-26
EP0038794B1 (fr) 1984-10-31
DE3166909D1 (en) 1984-12-06
EP0038794A3 (en) 1981-12-30

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