EP0038794B1 - Mahlanlage - Google Patents

Mahlanlage Download PDF

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Publication number
EP0038794B1
EP0038794B1 EP19810890069 EP81890069A EP0038794B1 EP 0038794 B1 EP0038794 B1 EP 0038794B1 EP 19810890069 EP19810890069 EP 19810890069 EP 81890069 A EP81890069 A EP 81890069A EP 0038794 B1 EP0038794 B1 EP 0038794B1
Authority
EP
European Patent Office
Prior art keywords
grinding
delivery
delivery chamber
opening
grinding drum
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
EP19810890069
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0038794A3 (en
EP0038794A2 (de
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/de
Publication of EP0038794A3 publication Critical patent/EP0038794A3/de
Application granted granted Critical
Publication of EP0038794B1 publication Critical patent/EP0038794B1/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
    • 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 plant 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 there is an axial discharge opening.
  • 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 difficulties arise particularly when the following machine has a relatively large good inlet height. If the regrind is to be conveyed from the discharge opening to, for example, 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 (cf. DE-B-1 200 655).
  • Such a bucket elevator is not only energy-intensive - the regrind is moved vertically over a very long conveying length - but also requires a hall of a specific design with a foundation pit and with at least one floor above the grinding drum. For maintenance and repairs to such a grinding plant, you need separate assembly overhead cranes on each floor, so that the construction and investment costs for this plant are very large.
  • the invention aims to avoid these disadvantages and difficulties and has as its object to create a grinding system of the type described in the introduction, in which it is possible to arrange downstream grinding machines on the same level as the grinding drum and together with the grinding drum on the smallest possible footprint and thus enable minimal conveying path lengths for the regrind.
  • the discharge opening opens into a rotating and rotationally symmetrical discharge chamber arranged coaxially to the grinding drum, the shell parts conveying the ground material from a level below the discharge opening to such a high level that it is closed without the aid of an additional upward conveyor downstream slave machines can be guided, extend above the discharge opening and the discharge chamber above the discharge opening has a removal device for the regrind.
  • a crop handling device with a rotating, lying drum is known, 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 system moving the material to be treated from the discharge opening of the Has drum at least partially conveying to a level above the discharge opening conveyor.
  • the discharge chamber according to the invention enables the regrind to be dispensed so far above the discharge opening of the grinding drum, so that the regrind can be conveyed to the downstream machines downstream of the grinding drum without the need for a bucket elevator.
  • the grinding system according to the invention it is therefore possible to set up a sifter downstream of the grinding drum directly next to the grinding drum and at the same level as it is so that it can be found with a hall with a small footprint and without a floor above the hall.
  • the entire system can be easily serviced using a single overhead traveling crane, which reduces investment costs and significantly reduces repair times.
  • the arrangement of the classifier directly next to the grinding drum results in 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 overhung on the grinding drum and fastened to it in a rotationally fixed manner. With these designs, the system can be built even more compactly and no separate drive is required for the discharge chamber.
  • the discharge chamber has a larger, preferably a diameter that is at least more than 1.75 times larger than the grinding drum.
  • 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, the scraper edges of the scraper being 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 in that the scraper is fastened to the cover at the discharge opening.
  • cup-shaped blades which end at a distance from the discharge opening, are arranged on the jacket parts of the discharge chamber and a continuous conveyor projects into the interior of the discharge chamber for the removal of the material conveyed by the blades.
  • a preferred embodiment is characterized in that the jacket of the grinding drum moves with a subcritical peripheral speed and the jacket of the discharge chamber with a supercritical peripheral speed, the critical peripheral speed being understood as a speed which sticks to the ground surface.
  • Grinding drums are operated at a speed at which the centrifugal force acting on the ground material or the grinding elements provided in the interior of 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, the larger centrifugal force caused by the larger radius (from a certain diameter) causes the material to be ground to rest on the lateral surfaces of the discharge chamber also above the axis of rotation, i. H. 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 preferred optimal embodiment of a grinding system is characterized in that a conveying device which conveys the material to be ground leads from the removal device to a classifier, that the classifier is located directly next to the grinding drum and at approximately the same height as the grinding drum and with it on a common floor, in particular on the Hallway is arranged, and that the sifter is a conveying device which conveys the coarse material to the inlet opening.
  • FIGS. 1 and 2 in a schematic representation of a grinding plant with a closed circuit of conventional design in side and front view, including the section shown in section, and FIGS. 3 and 4 a grinding plant according to the invention also in and show a front view with the hall shown in 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 a further 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 Shell of the grinding drum 4 engages peripherally arranged ring gear 11, drivable.
  • the ground material 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 connected to it in a rotationally fixed manner and therefore rotatable together Jacket 22 and a cylindrical jacket 23 extending from the periphery of this jacket, which at its outer end, i. H. on the end face 24 of the discharge chamber, is provided with an annular, radially inwardly extending rim 25.
  • 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) suctioned off via a line 29.
  • the stationary cover has a cylindrical rim 30, which is largely sealed against the radially inward rim 25 of the discharge chamber by means of a seal (not shown), for example a labyrinth seal, against sucked-in false air.
  • a seal for example a labyrinth seal
  • the stationary cover 27 has a discharge opening 31 for the ground material.
  • 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 for the supply of compressed air is provided below the diaphragm.
  • the regrind itself is in the conveying channel 38 arranged above the diaphragm by means of the compressed air passing through the diaphragm to a directly next to the grinding drum 4, i. H. arranged at approximately the same level arranged wind sifter 17.
  • 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 39, which is preferably designed as a conveyor belt.
  • the finished product is transported away by means of a continuous conveyor 40, for example by means of an air conveyor trough.
  • 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 subcritical speed n, i. H. the regrind 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.
  • the radially directed component of gravity becomes greater than the centrifugal force, the grinding media and grinding material particles detach from the drum wall and fall down again.
  • the diameter D of the discharge chamber 20 is designed according to the invention in such a way 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 exiting through the discharge opening 12 from the grinding drum 4 initially acts on the force of gravity the peripheral jacket parts 22, 23, 25 of the discharge chamber 20 arrive and then adhere to them as a result of the centrifugal force until it is raised to the scraper 32 provided above the discharge opening.
  • the stripper 32 releases the regrind 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.
  • Fig. 6 the material flow in the discharge chamber 20 is shown schematically. Since the scraper edges 33 of the scraper 32 are arranged at a short distance 34 from the casing parts 22, 23, 25 of the discharge chamber, a thin layer 45 of regrind always adheres to the cylindrical casing part 23, as can be seen in FIG. 6.
  • 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, a slight separation of the dust-like ground material from the vapors is granted and thus a relief of the dedusting units.
  • 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 48 projecting into the interior of the discharge chamber 46 through a discharge opening. which conveys the material to a wind sifter similar to the system shown in FIGS. 3 and 4.
  • 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 Mahlanlage Expired EP0038794B1 (de)

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 EP0038794A2 (de) 1981-10-28
EP0038794A3 EP0038794A3 (en) 1981-12-30
EP0038794B1 true EP0038794B1 (de) 1984-10-31

Family

ID=3529974

Family Applications (1)

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

Country Status (7)

Country Link
EP (1) EP0038794B1 (enrdf_load_html_response)
JP (1) JPS5735946A (enrdf_load_html_response)
AT (1) AT366595B (enrdf_load_html_response)
DE (1) DE3166909D1 (enrdf_load_html_response)
DK (1) DK184781A (enrdf_load_html_response)
ES (1) ES8300504A1 (enrdf_load_html_response)
IN (1) IN155719B (enrdf_load_html_response)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN118807936B (zh) * 2024-08-04 2025-01-10 山东精瓷新材料有限公司 一种碳化硅微粉研磨机构及其研磨方法

Family Cites Families (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

Also Published As

Publication number Publication date
IN155719B (enrdf_load_html_response) 1985-02-23
EP0038794A3 (en) 1981-12-30
DK184781A (da) 1981-10-25
DE3166909D1 (en) 1984-12-06
ATA220680A (de) 1981-09-15
ES501643A0 (es) 1982-11-01
AT366595B (de) 1982-04-26
ES8300504A1 (es) 1982-11-01
EP0038794A2 (de) 1981-10-28
JPS5735946A (ja) 1982-02-26

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