EP3256257B1 - Mahlwalze und verfahren zum abziehen einer bandage und aufschrumpfen einer bandage auf die welle der mahlwalze - Google Patents

Mahlwalze und verfahren zum abziehen einer bandage und aufschrumpfen einer bandage auf die welle der mahlwalze Download PDF

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Publication number
EP3256257B1
EP3256257B1 EP16703496.6A EP16703496A EP3256257B1 EP 3256257 B1 EP3256257 B1 EP 3256257B1 EP 16703496 A EP16703496 A EP 16703496A EP 3256257 B1 EP3256257 B1 EP 3256257B1
Authority
EP
European Patent Office
Prior art keywords
shaft
cooling
strap
bandage
grinding roller
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.)
Not-in-force
Application number
EP16703496.6A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3256257A1 (de
Inventor
Dieter Brendler
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.)
KHD Humboldt Wedag AG
Original Assignee
KHD Humboldt Wedag AG
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Filing date
Publication date
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Application filed by KHD Humboldt Wedag AG filed Critical KHD Humboldt Wedag AG
Publication of EP3256257A1 publication Critical patent/EP3256257A1/de
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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
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/30—Shape or construction of rollers
    • 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
    • B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
    • 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
    • B02C4/44—Cooling or heating rollers or bars

Definitions

  • the invention relates to a grinding roller of a high-pressure roller press, comprising a shaft, wherein the shaft is rotationally symmetrical with respect.
  • the invention further relates to a method for separating a bandage and a shaft in such a grinding roller and a method for frictionally connecting a bandage and a shaft to such a grinding roller, wherein the bandage and the shaft are designed with respect to their diameter in interference fit.
  • Grinding rollers are used as part of high-pressure roller presses (roller presses, high-bed roller mills) for the comminution of granular regrind, for example.
  • high-pressure roller presses roll presses, high-bed roller mills
  • a roller gap is formed between two grinding rollers, in which grinding material is drawn in by the two counter-rotating rollers and in which the material to be ground is crushed under high pressure.
  • scratches and micro-machining by the brittle regrind can lead to abrasive wear of the surface and outer layers of the roller.
  • measures are taken to protect against wear.
  • the grinding roller is viewed from the inside to the outside from a shaft that is in the high pressure roller press is stored accordingly, and a coaxial bandage constructed (szB the DE 20 2011 110 190 U1 ).
  • the bandage is made of wear-resistant material, especially made of suitable steel, protects the shaft against abrasion in the area of special grinding stress and often promotes the grinding process by means of a profiled surface. After a certain period of operation occurs in the bandage wear on, but does not need the shaft or the entire grinding roller to be replaced. Rather, it is sufficient an exchange or a workup of the bandage.
  • Such thermally permissible withdrawal of the shaft and the process of shrinking also lead to a heating process for the shaft.
  • the process of disassembly (but also the assembly) can be significantly promoted by the fact that the shaft is cooled thereby.
  • the shaft does not expand to the same extent as the heated bandage, so that it comes to a more incoming solution of the compound than without cooling the shaft.
  • the shafts are provided with a central, i. provided along the axis of rotation arranged cooling hole.
  • the external heat on the bandage must be increased in order to promote a solution of the connection;
  • the temperature range raised in this way is not gentle on the material, since structural changes or phase transformations can occur in alloys such as steel even at a few hundred degrees Celsius over time, which reduces the resistance of the grinding roller to the forces acting on it during the grinding process.
  • This is exacerbated by the fact that, with central cooling, the process of releasing (as well as producing) the frictional connection slows down as the size of the rolls increases. This not only means longer and more energy-intensive operations, but also a longer period in which the mentioned phase transformations can occur and take place.
  • a temperature-related significantly stronger cooling in the central area would not only be economically intensive, but would also lead to large temperature gradients in the radial direction within the shaft itself, which also, for example, by tensions, contribute to material weakening.
  • the object of the invention is therefore to provide a grinding roller of a high-pressure roller press, in which a simple, fast and gentle material separation of a shrunk bandage of the shaft and a simple, fast and material-friendly frictional connection of a bandage with the shaft are possible even with large shaft diameter.
  • the object of the invention is also to specify a method associated with this grinding roller for separating bandage and shaft and a method for non-positive connection of bandage and shaft.
  • the object of the invention is achieved by a grinding roller of a high-pressure press with the features of claim 1, by a method for separating a bandage and a shaft in such a grinding roller with the features of claim 6 and by a method for frictional connection of a bandage and a shaft solved such a grinding roller with the features of claim 7. Further advantageous embodiments are specified in the subclaims to claim 1.
  • the shaft has cooling bores extending in the axial direction for the flow of coolant.
  • the channel-like cooling bores which are completely traversing the shaft and open at both ends for inlet and outlet of the gaseous or liquid coolant, are according to the invention not in or near the center of the shaft, but arranged in the outer region of the shaft, so close to the joint surface between the shaft and shrunk bandage.
  • the shaft of the grinding roller is suitably mounted at high pressure roller presses at the ends, so that the shaft is only in a central region or longitudinal section of the bandage and is protected by this during the milling process against wear.
  • the cooling bores are arranged in the outer region of the shaft in such a way that they pierce the interior of a geometric circular ring through the shaft at a cross section through the shaft perpendicular to the axis of rotation, in the region of the longitudinal section of the shaft with bandage casing.
  • the center of this imaginary circle lies on the axis of rotation.
  • the outer radius r max of the annulus is equal to the outer radius of the shaft r w
  • the inner radius r min of the annulus is one third of the outer radius (1/3 r max ), preferably two thirds of the outer radius (2/3 r max ).
  • cooling is best suited if it takes place by means of cooling channels within such a metered, outer region of the shaft.
  • the cross-sections through the cooling holes lie entirely within this range, ie in particular not open on the surface (or outer joint surface) of the shaft.
  • Such a construction enables effective cooling of the grinding roller, in particular the shaft, even in the outer region of the shaft, when the shaft diameter is a few meters (typically up to 2.5 m).
  • the bandage can be profiled on its surface, so that an autogenous wear protection layer is formed on the grinding roller during the grinding process by adhesion of a layer of comminuted and compacted millbase.
  • additional bodies for example, pin-like or plate-shaped hard bodies of highly wear-resistant material, these additional bodies are not considered terminologically in the present context as part of the bandage.
  • their assembly or disassembly are generally separate and possibly separate from the processes described herein of stripping and mounting the bandage on the shaft.
  • the cooling holes are located in the outer region of the shaft. Due to the sometimes heavy loads of the grinding roller in the grinding operations a symmetrical to the axis of rotation of the roller distribution of the cooling holes is preferable because of the forces acting.
  • An embodiment of the invention therefore provides that the cooling bores in a perpendicular to the axis of rotation executed cross section through the shaft symmetrically distributed on a circle (arrangement circle) with center on the axis of rotation and radius r 1 , between the outer and inner radius of the pierced, geometric Circular ring is (r min ⁇ r 1 ⁇ r max ), are arranged.
  • the cooling holes are therefore arranged at equidistant intervals on a circle in the outer region of the shaft, wherein the array of the shaft surface is at least as far engaged in the shaft interior, that the cooling holes are not cut on the shaft surface, ie are open.
  • the symmetrical arrangement also allows for uniform cooling of the shaft in the process of applying and removing the heated bandage.
  • the cooling holes in a perpendicular to the axis of rotation executed cross section through the shaft symmetrically distributed on at least two concentric circles (arrangement circles) with center on the axis of rotation and radii (r 1 , r 2 , ... ), which lie between the outer and inner radius of the pierced, geometric circular ring (r min ⁇ r 1 ⁇ r 2 ⁇ ... ⁇ r max ) are arranged, wherein the cooling holes of different arrangement circles in the radial direction with each other or offset from each other , In a suitable offset, the bores are located on an array circle centrally below or above the gap between two holes on the adjacent array circle.
  • a strong and rapid cooling of the shaft is intended in its outer region for the removal and mounting of the bandage
  • a strong decrease in temperature radially from the inside to the outside can have negative effects on the shaft material, for example. This can be particularly in phases in which, for example, unforeseen, delays the process of mounting the heated bandage.
  • An embodiment of the invention therefore provides that centrally through the shaft a central cooling bore is provided for the flow through with gaseous or liquid coolant. If necessary, this cooling in the center of Wave are counteracted to a possibly too high temperature gradient. This can also prove to be advantageous if the shaft in turn is assembled from a plurality of concentric hollow cylinders, the non-positive connection would solve at excessive temperature gradients over long periods.
  • cooling tubes for guiding the coolant are arranged in the cooling bores.
  • the construction of the grinding roller according to the invention is aimed at being able to carry out simple, rapid and material-saving procedures for disassembling (pulling) or mounting (mounting) bandages on or on shafts in grinding rolls which have a large roll diameter, in particular a large shaft diameter exhibit.
  • an inventive method for separating bandage and shaft is provided, which is characterized by the following steps: heating the bandage by external heat supply for thermal expansion of the bandage, thereby cooling the shaft with a cooling medium flowing through the cooling holes and pulling off the bandage in the longitudinal axis defined by the axis of rotation of the shaft.
  • the bandage is to be removed from the shaft of the grinding roller according to the invention, a dilation of the bandage due to thermal expansion is effected, as is previously known, by rapid, very intensive heat input from the outside to the bandage.
  • a cooling of the shaft is made so that it does not expand in terms of their outer diameter also to a relevant extent. Cooling by supplying a coolant in the center of the shaft is not sufficient for large shaft diameters.
  • the structure of the grinding roller according to the invention with the characteristics of the shaft allows a simple and quickly carried out process.
  • Bandage and shaft must of course be given here in a size ratio, which leads to a well-established, non-positive connection in the known thermal shrinking.
  • the skilled person will make a suitable interference fit here, taking into account the specific thermal expansion behavior of the materials involved, so choose a bandage inside diameter, which is slightly smaller at ambient temperature than the outer diameter (joint diameter) of the shaft.
  • the inventive method for non-positive connection of the bandage and the shaft is characterized by heating the separately present bandage, cooling the shaft with a coolant flowing through the cooling holes and by pulling the bandage on the shaft, wherein the wound-up bandage shrinks by cooling or cooling on the shaft ,
  • the cooling of the bandage is advantageous before the process of winding and is continued during this.
  • the removal of cooling by means of the present invention in the outer region, near the joining surface arranged cooling holes for only a small heat input into the shaft, so that it does not expand and the heated, thus extended bandage can be striped in the axial direction over the shaft.
  • the bandage contracts and it results in a non-positive connection.
  • This shrinkage can be accelerated by continuous cooling of the shaft and possibly cooling from the outside, which makes the expert so that the desired material properties are retained or adjust.
  • the methods of peeling and winding can be performed in exactly the same way, when several smaller bandages are arranged side by side in the axial direction.
  • FIG. 1 is shown in side view, the shaft 1 of a grinding roller 2 according to the invention, as is typical for use in high-pressure roller presses (roller presses).
  • the grinding roller 2 consists of the shaft 1 and a not shown here, by thermal shrinkage frictionally connected to the shaft 1, wear-resistant bandage 3.
  • the shaft 1 is rotatable and rotationally symmetrical to a rotational axis 4 and tapers towards the ends in favor of Storage, the lower weight and the easier removal and mounting a bandage 3 from or to the middle, the largest diameter possessing portion of the shaft 1.
  • Schematically drawn are two cooling holes 5, which are arranged according to the invention in the outer region of the shaft 1.
  • FIG. 2 illustrates in a direction perpendicular to the axis of rotation 4 cross-section through a grinding roller 1 according to the invention in the section where the shaft 1 is enclosed by the bandage 3, schematically the geometric relationships of the position of the cooling holes 5.
  • the cooling holes 5 arranged symmetrically on an imaginary arrangement circle 6.
  • the cooling holes 5 do not intersect the joining surface 7 between the shaft 1 and the bandage 3, but are advantageously arranged in the outer region of the shaft 1. According to the invention, they are arranged in an imaginary, here symbolically with its inner circumference drawn circular ring 8, 8 ', the center of which lies on the axis of rotation 4 to the advantage of the method of removing and pulling the bandage 3.
  • FIG. 3 we in a cross-sectional representation (corresponding FIG. 2 ) An embodiment shown in which the cooling holes 5 on two imaginary concentric arrangement circles 6, 6 'with the radii r 1 and r 2 within the imaginary circular ring 8, 8' (not shown) are arranged.
  • Several such arrangement circles 6, 6 ' can be advantageous for large grinding rolls 2 for a more even cooling without excessive' perforation 'of the shaft 1 along only one circular line.
  • the cooling bores 5 of the two arrangement circuits 6, 6 ' are offset from one another for reasons of uniform cooling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Rolls And Other Rotary Bodies (AREA)
EP16703496.6A 2015-02-09 2016-02-03 Mahlwalze und verfahren zum abziehen einer bandage und aufschrumpfen einer bandage auf die welle der mahlwalze Not-in-force EP3256257B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015001617.2A DE102015001617C5 (de) 2015-02-09 2015-02-09 Mahlwalze und Verfahren zum Abziehen einer Bandage und Aufschrumpfen einer Bandage auf die Welle der Mahlwalze
PCT/EP2016/052270 WO2016128274A1 (de) 2015-02-09 2016-02-03 Mahlwalze und verfahren zum abziehen einer bandage und aufschrumpfen einer bandage auf die welle der mahlwalze

Publications (2)

Publication Number Publication Date
EP3256257A1 EP3256257A1 (de) 2017-12-20
EP3256257B1 true EP3256257B1 (de) 2018-08-15

Family

ID=55315406

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16703496.6A Not-in-force EP3256257B1 (de) 2015-02-09 2016-02-03 Mahlwalze und verfahren zum abziehen einer bandage und aufschrumpfen einer bandage auf die welle der mahlwalze

Country Status (5)

Country Link
EP (1) EP3256257B1 (zh)
CN (1) CN107206385B (zh)
DE (1) DE102015001617C5 (zh)
DK (1) DK3256257T3 (zh)
WO (1) WO2016128274A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2614082A (en) * 2021-12-21 2023-06-28 Weir Minerals Netherlands Bv Demounting a high pressure grinding roller

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110385169B (zh) * 2019-07-26 2021-07-20 四川佳衡建设工程有限公司 一种辊压机辊套
AT524483A1 (de) * 2020-08-19 2022-06-15 Primetals Technologies Austria GmbH Strangführungsrolle mit einer verschleißfesten Laufschicht

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2614082A (en) * 2021-12-21 2023-06-28 Weir Minerals Netherlands Bv Demounting a high pressure grinding roller
WO2023119045A1 (en) * 2021-12-21 2023-06-29 Weir Minerals Netherlands B.V. Demounting a high pressure grinding roller
GB2614082B (en) * 2021-12-21 2024-01-31 Weir Minerals Netherlands Bv Demounting a high pressure grinding roller

Also Published As

Publication number Publication date
CN107206385A (zh) 2017-09-26
EP3256257A1 (de) 2017-12-20
CN107206385B (zh) 2019-08-06
DE102015001617C5 (de) 2020-08-13
WO2016128274A1 (de) 2016-08-18
DE102015001617B3 (de) 2016-06-02
DK3256257T3 (en) 2018-12-10

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