EP3651978B1 - Walzenpresse und verfahren zur bestimmung des füllstandes - Google Patents

Walzenpresse und verfahren zur bestimmung des füllstandes Download PDF

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Publication number
EP3651978B1
EP3651978B1 EP18733851.2A EP18733851A EP3651978B1 EP 3651978 B1 EP3651978 B1 EP 3651978B1 EP 18733851 A EP18733851 A EP 18733851A EP 3651978 B1 EP3651978 B1 EP 3651978B1
Authority
EP
European Patent Office
Prior art keywords
chute
feed chute
filling level
roller press
load cells
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.)
Active
Application number
EP18733851.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3651978A1 (de
Inventor
Felix HEINICKE
Harald Günter
Eggert De Weldige
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.)
Maschinenfabrik Koeppern GmbH and Co KG
Original Assignee
Maschinenfabrik Koeppern GmbH and Co KG
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 Maschinenfabrik Koeppern GmbH and Co KG filed Critical Maschinenfabrik Koeppern GmbH and Co KG
Publication of EP3651978A1 publication Critical patent/EP3651978A1/de
Application granted granted Critical
Publication of EP3651978B1 publication Critical patent/EP3651978B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/005—Control arrangements
    • B30B11/006—Control arrangements for roller presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/286—Feeding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/30—Feeding material to presses
    • B30B15/302—Feeding material in particulate or plastic state to moulding presses
    • B30B15/308—Feeding material in particulate or plastic state to moulding presses in a continuous manner, e.g. for roller presses, screw extrusion presses

Definitions

  • Such a roller press is particularly preferably a material-bed roller mill, which is preferably used for comminuting material.
  • the invention also includes roller presses or high-pressure roller mills for compacting or briquetting material.
  • the two press rollers are mounted in the press frame so that they are driven in rotation, with the two press rollers being driven in opposite directions.
  • one of the two rolls is designed as a fixed roll and the other roll is mounted as a loose roll (laterally displaceable), with this movable loose roll being acted upon by a hydraulic system supported on the press frame.
  • two loose rollers or other frame concepts can also be implemented.
  • the principle according to the invention is independent of this. The material will fed or allocated to the nip via the feed chute solely with the aid of gravity.
  • Roller presses are usually operated with a material feed for efficient operation. This means that for continuous and therefore trouble-free and economical operation at the desired operating point of the roller press, there must always be a sufficient level of material in the feed chute, so that there is always sufficient material available for feeding into the roller gap. This is because the roller gap effective between the rollers generally depends on the fill level of the material in the feed chute, so that the fill level can have an influence on the throughput of the roller press, with this influence decreasing as the fill level increases. In practice, therefore, efforts are often made to ensure a constant fill level in the feed chute. For this reason, determining the fill level with the help of a measuring device is of practical importance, with the conveying means (e.g. conveyor belts) for filling the feed chute preferably being controlled via a suitable control or regulation (e.g. speed control/regulation of the conveyor belts). can be coupled to a level signal in the feed chute.
  • the conveying means e.g. conveyor belts
  • a suitable control or regulation e.g. speed control/regulation
  • feed chutes with a cross section that tapers downwards are not always an option, so that in practice feed chutes are used that have a cross section that is constant over the height or preferably one that decreases have bottom widening cross-section.
  • z. B. worked with a radiometric level measurement, in which the weakening of radioactive radiation in the form of absorption and scattering is used by the filling. The prerequisite for this is the use of radioactive radiation sources, which, of course, may only be operated under certain conditions. Overall, dealing with such radiometric measurement methods is complex. - This is where the invention comes in. Because the invention relates in particular to the processing of material with low flowability, z. B. ore-bearing material, in particular finely ground ores, so-called fine ores. A (wet) iron ore concentrate is preferably processed for subsequent pelleting.
  • a device with several roller presses according to the preamble of claim 1 is known, which are acted upon via a feed chute, wherein the feed chute can widen from top to bottom.
  • the level within the feed chute can, for. B. be monitored with a capacitive level sensor, which is arranged inside the chute.
  • a weight sensor is also mentioned, which is also arranged inside the chute and is acted upon by the material.
  • the invention is therefore based on the object of creating a roller press of the type described above which (also) when processing materials with low flowability (in particular moist and sticky feed materials) enables a simple level measurement without using radiometric methods or other radiation-based methods .
  • the invention teaches a roller press with the features of claim 1 and a method with the features of claim 7.
  • the measuring device is designed as a gravimetric measuring device for a gravimetric level measurement.
  • gravimetric fill level measurement means a fill level measurement on a mechanical basis, dispensing with radiometric or radiation-based measurements, in which the fill level is determined by measuring the mass or the resulting weight of the material.
  • the invention is initially based on the knowledge that for certain applications, in particular for the processing of material with low flowability, it is absolutely necessary to work with a feed chute that does not taper downwards, but one that widens downwards has cross section.
  • the invention also includes embodiments in which the feed chute has a constant cross-section only in sections, so that in particular feed chutes are also included that widen downwards in a stair-like or step-like manner.
  • the invention has now recognized that a gravimetric filling level measurement can be used even with such a geometry of the feed chute, in which the feed material is to be prevented from adhering to the chute walls and thus a constant material flow is to be achieved.
  • the flow behavior of bulk solids in a manhole leads to stresses in the bulk solid and, taking into account the wall friction and the bulk solid properties, to wall stresses. Due to the bulk material, horizontal stresses act in a chute cross-section and due to the support on the inner walls of the chute, these result in weight forces at the bearing points of the feed chute.
  • the material consequently generates a surprisingly high force transmission to the shaft wall in the form of a relevant mass or a relevant vertical force component that can be measured. Depending on the material properties and geometry, this corresponds to around 35% to 45% of the feed mass.
  • the configuration according to the invention is particularly useful when processing material with low flowability, especially since such material enables a particularly effective transmission of force to the shaft walls. What is interesting is the fact that in this way a fill level measurement is possible both statically (e.g. after filling the feed chute) and dynamically (e.g. for continuously sliding material during the pressing operation).
  • a feed chute that widens downwards is preferably used within the scope of the invention.
  • This has one or more shaft walls (at least in sections) at a (negative) angle of z. B. 0.1 ° to 10 °, preferably z. B. 0.5 ° to 5 ° are oriented to the vertical.
  • relatively small angles of inclination are used, which, however, already ensure an improved material supply to the roller press in the case of poorly flowing bulk materials and in which, surprisingly, a gravimetric filling level measurement can be implemented in the manner described above.
  • the measuring device has one or preferably several weighing cells that support the feed chute. Consequently, the weight generated by the total mass of the feed chute is measured via the load cells, this being dependent on the filling level of the material in the feed chute in the manner according to the invention.
  • the task chute is on one or more load cells by z.
  • the feed chute is arranged with the interposition of the load cells on the press frame.
  • the feed chute can have a lower frame or can be connected to a lower frame, with this lower frame being arranged on the press frame with the load cells being interposed.
  • Such a compensator can, for. B. have an upper flange for connection to the feed chute or its lower frame and a lower flange for connection to the press frame, wherein between the upper flange and the lower flange an elastic and / or movable frame is provided, the z. B. made of elastomeric material, z. B. made of rubber, or vertically against each other and / or mutually displaceable shaft elements can be made.
  • the load cells can then z. B. be arranged between the upper flange and the lower flange of the compensator.
  • load cells can be used for the load cells.
  • B. can be designed as electromechanical load cells.
  • the electrical resistance of one or more strain gauges (DMS) integrated into it changes due to the elastic deformation of a deformation body. about e.g. B. a bridge circuit is the resistance change represented in a voltage signal proportional to the weight.
  • load cells of a different design can also be used.
  • the feed chute is usually made of metal, z. B. made of steel and experiments have shown that for different materials such. B. for ore-bearing material, z. B. fine ore, a sufficient power transmission takes place on the container wall for a reliable gravimetric level measurement.
  • a coating e.g. for the purpose of protection against wear
  • the shaft walls can z. B. with plastic sheets, z. B. made of polyethylene or the like lined.
  • the invention can also be implemented with such coatings.
  • the subject matter of the invention is not only the roller press described, but also a method for determining the fill level of material in a shaft, in particular in the course of loading a roller press of the type described above Roller presses placed under protection.
  • This method is characterized in that the shaft, z. B. feed chute, one or more vertical or inclined to the vertical oriented shaft walls to form a constant over the height or from top to bottom widening cross-section.
  • the method is characterized in that the fill level is determined gravimetrically by means of load cells acted upon by the shaft is measured by using the load cells to measure a weight or mass introduced into the container walls and use this to determine the fill level.
  • This method is preferably used in the course of loading a roller press of the type described, so that the chute is designed as the feed chute of a roller press.
  • low flowability means materials with a flowability ff c of less than 10, preferably less than 4.
  • the flowability ff c is the ratio of the consolidation stress and the compressive strength.
  • Consolidation stress is the stress required to compress a bulk material sample in a hollow cylinder. If the load in the vertical direction and the hollow cylinder are removed and the cylindrical bulk sample is subjected to compressive stress, the sample will fracture or flow when the compressive strength is reached.
  • Materials with low fluidity have high internal friction, so that they also transmit friction to vertical or negatively inclined shaft walls. In a preferred embodiment, this effect is utilized within the scope of the invention.
  • the method according to the invention enables not only a static filling level measurement, but also a dynamic filling level measurement and consequently a filling level measurement in the continuous operation of the roller press.
  • the invention provides that the level below Using one or more conversion functions is determined, which are made available for the respective shaft geometry and / or the respective material.
  • the material properties including the flowability ff c and the material moisture, the wall inclination/shaft angle and the coefficient of friction between the material and the shaft wall have an influence.
  • the evaluation e.g. with a computer
  • the evaluation then involves a corresponding and possibly also non-linear conversion of the measurement signal from the load cells into a corresponding filling level, also taking into account the material and construction parameters mentioned above.
  • a roller press is shown in the embodiment as a high-pressure roller mill. This is used in the embodiment of the crushing of material such.
  • the roller press has a press frame 1 and two rollers 2 which are arranged next to one another in the press frame 1 and between which a roller gap 3 is formed.
  • the two rollers 2 are driven in opposite directions by drives, not shown.
  • the feed chute has at least two opposing chute walls 4a, which are each inclined vertically at an angle ⁇ to the vertical, so that the feed chute 4 has a cross section that widens from top to bottom.
  • the (negative) angle ⁇ can be about 0.1° to 10°, preferably only 0.5° to 5°, e.g. 0.5 to 2°.
  • the roller press is equipped with a measuring device 5 with which the fill level of the material in the feed chute 4 can be determined and monitored.
  • this measuring device 5 is designed as a gravimetric measuring device, so that a gravimetric filling level measurement takes place.
  • this gravimetric measuring device 5 has a plurality of weighing cells 6 which are acted upon by the feed chute 5 .
  • this is implemented in such a way that the feed chute 4 stands on the weighing cells 6 .
  • the task chute in the embodiment on a lower frame 7, said lower frame 7 with the interposition of the load cells 6 on the Press frame 1 is arranged.
  • the feed chute 4 can be connected to the press frame 1 with the interposition of a compensator that is elastic or displaceable in the vertical direction. Details of the compensator are not shown.
  • the filling level of the material in the feed chute 4 can be determined not only statically (e.g. after filling or emptying), but also dynamically and consequently continuously during filling and also (simultaneous) emptying in the context of the invention Determine and monitor the operation of the roller press. So far, such a gravimetric level measurement has only been used in funnel-shaped feed shafts that taper downwards, in which the weight of the material is introduced into the shaft walls, particularly due to the geometry.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Food Science & Technology (AREA)
  • Weight Measurement For Supplying Or Discharging Of Specified Amounts Of Material (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
EP18733851.2A 2017-07-14 2018-06-22 Walzenpresse und verfahren zur bestimmung des füllstandes Active EP3651978B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017115856.1A DE102017115856A1 (de) 2017-07-14 2017-07-14 Walzenpresse und Verfahren zur Bestimmung des Füllstandes
PCT/EP2018/066740 WO2019011626A1 (de) 2017-07-14 2018-06-22 Walzenpresse und verfahren zur bestimmung des füllstandes

Publications (2)

Publication Number Publication Date
EP3651978A1 EP3651978A1 (de) 2020-05-20
EP3651978B1 true EP3651978B1 (de) 2023-09-06

Family

ID=62716073

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18733851.2A Active EP3651978B1 (de) 2017-07-14 2018-06-22 Walzenpresse und verfahren zur bestimmung des füllstandes

Country Status (9)

Country Link
EP (1) EP3651978B1 (zh)
CN (1) CN110944830B (zh)
BR (1) BR112020000773A2 (zh)
DE (1) DE102017115856A1 (zh)
DK (1) DK3651978T3 (zh)
FI (1) FI3651978T3 (zh)
RU (1) RU2739742C1 (zh)
UA (1) UA124509C2 (zh)
WO (1) WO2019011626A1 (zh)

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Also Published As

Publication number Publication date
DE102017115856A1 (de) 2019-01-17
CN110944830B (zh) 2022-11-08
EP3651978A1 (de) 2020-05-20
WO2019011626A1 (de) 2019-01-17
DK3651978T3 (da) 2023-11-27
UA124509C2 (uk) 2021-09-29
CN110944830A (zh) 2020-03-31
RU2739742C1 (ru) 2020-12-28
FI3651978T3 (fi) 2023-11-28
BR112020000773A2 (pt) 2020-07-14

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