EP3383540B1 - Rotor, schleifmaschine, luftabsaugummantelung und schleifelement für eine schleifmaschine - Google Patents

Rotor, schleifmaschine, luftabsaugummantelung und schleifelement für eine schleifmaschine Download PDF

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Publication number
EP3383540B1
EP3383540B1 EP16805445.0A EP16805445A EP3383540B1 EP 3383540 B1 EP3383540 B1 EP 3383540B1 EP 16805445 A EP16805445 A EP 16805445A EP 3383540 B1 EP3383540 B1 EP 3383540B1
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EP
European Patent Office
Prior art keywords
rotor
grinding
chamber wall
grinding machine
air
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
EP16805445.0A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3383540A1 (de
Inventor
Benjamin KINZEL
Jürgen Moosmann
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.)
Buehler AG
Original Assignee
Buehler AG
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 Buehler AG filed Critical Buehler AG
Publication of EP3383540A1 publication Critical patent/EP3383540A1/de
Application granted granted Critical
Publication of EP3383540B1 publication Critical patent/EP3383540B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02B—PREPARING GRAIN FOR MILLING; REFINING GRANULAR FRUIT TO COMMERCIAL PRODUCTS BY WORKING THE SURFACE
    • B02B3/00—Hulling; Husking; Decorticating; Polishing; Removing the awns; Degerming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02B—PREPARING GRAIN FOR MILLING; REFINING GRANULAR FRUIT TO COMMERCIAL PRODUCTS BY WORKING THE SURFACE
    • B02B3/00—Hulling; Husking; Decorticating; Polishing; Removing the awns; Degerming
    • B02B3/04—Hulling; Husking; Decorticating; Polishing; Removing the awns; Degerming by means of rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02B—PREPARING GRAIN FOR MILLING; REFINING GRANULAR FRUIT TO COMMERCIAL PRODUCTS BY WORKING THE SURFACE
    • B02B5/00—Grain treatment not otherwise provided for
    • B02B5/02—Combined processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02B—PREPARING GRAIN FOR MILLING; REFINING GRANULAR FRUIT TO COMMERCIAL PRODUCTS BY WORKING THE SURFACE
    • B02B7/00—Auxiliary devices
    • B02B7/02—Feeding or discharging devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/02—Crushing or disintegrating by disc mills with coaxial discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/02—Crushing or disintegrating by disc mills with coaxial discs
    • B02C7/08—Crushing or disintegrating by disc mills with coaxial discs with vertical axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/11—Details
    • B02C7/12—Shape or construction of discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02B—PREPARING GRAIN FOR MILLING; REFINING GRANULAR FRUIT TO COMMERCIAL PRODUCTS BY WORKING THE SURFACE
    • B02B1/00—Preparing grain for milling or like processes

Definitions

  • the invention relates to a rotor and a grinding machine for the food and feed industry as well as a grinding element for a grinding machine and an air suction casing according to the preamble of the independent claims.
  • Grinding machines are used in the food and feed industry to cut the outer layers of cereal products, pulses and the like, such as rice, (hard) wheat, bulgur, rye, barley, millet, peas, lentils, quinoa, durum, and dry beans and pepper, sanded down in layers, for example to make later processing easier or to influence the organoleptic properties.
  • Rotating grinding wheels are used which are coated with an abrasive material and / or provided with an abrasive surface. When passing through the grinding machine, the product to be ground is brought into contact with the abrasive material or the abrasive surface and ground off.
  • Known grinding machines are, however, unsatisfactory in many respects with regard to the grinding performance, also known as the grinding degree.
  • the EP 0 668 107 A1 discloses a rotor according to the preamble of claim 1.
  • the invention is therefore based on the object of specifying a rotor for a grinding machine which avoids the disadvantages of the known and in particular allows a high throughput with sufficient grinding power and is not clogged by ground grinding dust.
  • the rotor should be able to withstand high speeds and circumferential speeds.
  • the rotor comprises a plurality of essentially cylindrical grinding elements, each with an outer grinding surface in the form of an essentially circular cylinder jacket.
  • essentially cylindrical surface-shaped grinding surface is understood to mean a grinding surface which approximates a circular cylinder surface and can have a rounded or beveled edge.
  • the grinding element is preferably designed as a hollow cylinder. This is particularly preferred for reasons of weight and cost.
  • an air flow can be generated inside the rotor, which supports the removal of the sanded off sanding dust and thus counteracts clogging of the sanding surfaces.
  • the grinding elements are arranged coaxially one above the other and in such a way that an essentially annular air gap is created between the grinding surfaces of two adjacent grinding elements. It is evident to a person skilled in the art that the grinding elements have essentially the same outside diameter. Furthermore, due to the shape of the grinding surface with a rounded or chamfered edge, the air gap is also approximately annular.
  • a ratio between an envelope surface of the rotor and a total grinding surface of the rotor is greater than 1.05, preferably greater than or equal to 1.1, even more preferably greater than or equal to 1.12.
  • the ratio between the envelope surface of the rotor and the total grinding surface of the rotor is less than 1.25.
  • the envelope surface of the rotor is defined by the envelope surface of a circular cylinder with a rotor diameter.
  • the height of the rotor is measured between the respective outer edges of the respective grinding element.
  • the total grinding area is defined as the sum of the grinding areas of the grinding elements, with each grinding area being defined by the envelope surface of a circular cylinder with a rotor diameter (same grinding element diameter) and grinding element height is defined.
  • the height of the grinding element does not include spacers, fastening elements and the like, which may protrude beyond the height of the grinding element.
  • a ratio according to the invention allows very high rotational speeds of the rotor, so that a correspondingly higher throughput than previously is possible.
  • the air gaps allow the removal of sanded off sanding dust, so that the sanding surface is not clogged, in particular if the sanding elements are hollow.
  • the rotor preferably has a total grinding area between 0.7 and 1.2 m 2 and / or an envelope area between 0.8 and 1.5 m 2 .
  • the rotor has an outer diameter between 0.5 and 0.6 m.
  • the rotor preferably has a height between 0.5 and 0.6 m.
  • a ratio between the height of the grinding element and the outside diameter is preferably between 1/8 and 1/12.
  • the height of the annular air gap is preferably between 5 and 9 mm.
  • the grinding elements are preferably of the same design and are equally spaced from one another, so that the most optimal and homogeneous flow of air possible through the rotor and the associated removal of abraded grinding dust is generated.
  • a grinding element preferably comprises a base body with an outer, essentially circular cylinder jacket-shaped outer surface and a coating applied to the outer surface.
  • the coating is preferably a diamond coating. These can be natural or synthetic diamonds.
  • the coating comprises diamonds as an abrasive and can comprise further auxiliary materials as a carrier and / or abrasive.
  • further materials such as quartz, corundum, emery, garnet, silicon carbide, chromium oxide and boron nitride are possible.
  • the diamond coating is preferably a galvanic diamond coating.
  • the base body preferably comprises at least one metallic outer surface.
  • a galvanic diamond coating allows the formation of a very stable grinding surface, which can withstand very high speeds and peripheral speeds.
  • the coating in particular the diamond coating, preferably has an average particle size between 0.3 mm and 0.8 mm.
  • Such an average particle size has proven to be particularly suitable for the treatment of food and feed.
  • the object is achieved by a grinding machine according to claim 7.
  • the grinding machine comprises a substantially cylindrical rotor, a rotor housing with an inlet and an outlet for the product to be ground or ground, and a drive for driving the rotor.
  • the rotor is a rotor according to the invention.
  • the rotor is driven directly.
  • a drive shaft of the drive is directly connected to the rotor.
  • the drive shaft is not driven via transmission elements such as chains, belts, belts and the like, but also via gears, as was previously the case.
  • the drive shaft is preferably arranged coaxially to the rotor.
  • the grinding machine and / or the rotor housing preferably has a grinding chamber with a chamber wall which is essentially in the form of a circular cylinder jacket and which surrounds the rotor coaxially.
  • the chamber wall is arranged at a distance from the grinding surface, so that a grinding gap is formed.
  • the axis of rotation of the rotor is preferably arranged perpendicular to a gravitational vector so that the product to be ground can only be conveyed by gravity.
  • other arrangements of the rotor are also possible depending on the application.
  • the grinding gap width i. the radially measured distance between the chamber wall and the grinding surface between 15 and 25 mm.
  • the chamber wall is preferably provided with a plurality of air passage openings.
  • the air feed-through openings allow air to flow out of or into the rotor housing, so that the light, sanded-off grinding dust can be removed.
  • the air duct openings are preferably designed as a slot. Compared to circular holes, slots are less prone to clogging.
  • the slots are preferably between 0.8 mm and 1.5 mm wide. In this sense, the width of the slots is measured as the distance between two side walls of the slots in a direction perpendicular to the longitudinal extent of the slots.
  • the chamber wall is preferably provided with protruding brake and stowage bars, which each extend essentially parallel or coaxially circumferentially to the rotor axis.
  • the brake and jam bars reduce the width of the grinding gap in the area of the brake and jam bars and deflect the product to be sanded, so that it can be ensured that the product to be sanded is treated evenly.
  • the brake strips are designed to be adjustable, so that the projection with respect to the chamber wall can be adjusted between 4 mm and 10 mm.
  • the outlet preferably has at least one gate valve for adjusting a product flow.
  • the gate valve is preferably arranged such that a closing or opening direction of a slide plate of the gate valve is essentially perpendicular to the gravitational vector. In this way, the movement of the slide plate is not impaired by the weight of the abraded product, which, depending on the position of the slide plate, is accumulated and weighs on the slide plate.
  • a gate valve can be set better and more precisely than, for example, shut-off cones with a counterweight.
  • the gate valve is preferably designed as an annular diaphragm with a plurality of outlet openings.
  • the gate valve and / or the annular diaphragm is preferably regulated and / or controlled as a function of the power consumed by the drive - ie (partially) opened and closed. Since the grinding power, and consequently the grinding degree, is related to the power consumed by the drive, the desired grinding machine can be determined in a simple manner using a characteristic curve of the grinding machine Grinding degree can be set by the product to be ground is dammed in the grinding gap and the gate valve and / or the annular diaphragm is controlled and / or regulated in such a way that the power consumed by the drive remains constant.
  • the rotor can be operated with a speed between 1400 and 1800 revolutions / min and / or a peripheral speed between 40 and 100 m / s.
  • the grinding machine preferably comprises an air suction device, which can preferably be operated with a suction power between 40 and 95 m 3 / min.
  • a plurality of air suction ducts are preferably arranged around the chamber wall and are fluidically connected to the air suction device.
  • the air suction channels preferably form a casing for the chamber wall and are arranged one above the other.
  • an air flow is preferably generated by the air suction device via the air suction channels, so that air flows from the outside over the rotor and through the air gaps between adjacent grinding elements of the rotor and the air duct openings in the chamber wall and takes the light, sanded off grinding dust with it.
  • the air suction ducts are preferably designed as a casing of the grinding chamber with a casing surface and a plurality of radial bottoms which extend between the casing surface and the chamber wall.
  • the jacket surface is preferably not arranged concentrically to the rotor and to the chamber wall, but rather extends in such a way that, viewed in the circumferential direction of the rotor or the chamber, a Distance between the chamber or rotor increases, in particular increases steadily.
  • the lateral surface preferably runs in a spiral.
  • the air suction channels enable a homogeneous distribution of the air flow over the entire height of the rotor and the chamber wall, so that clogging of the grinding surface and clogging of the air duct openings are largely counteracted. Furthermore, the preferred course of the lateral surface allows the formation of a constant pressure gradient over the entire circumference of the rotor or the chamber wall.
  • the rotor is preferably mounted on one side.
  • the rotor is mounted in a lower area, the upper end face of the rotor being provided with a conical or frustoconical cover.
  • the inlet for the product to be ground is also located in this area.
  • the inlet is central - i.e. concentric to the rotor - arranged. This allows an even distribution of the product to be ground over the entire circumference of the rotor in the grinding gap.
  • there is no need for conveying devices in the inlet area which is desirable with regard to a hygienic design.
  • This disclosure also relates to a method of operating a grinding machine for the food and feed industry.
  • the above statements relating to the grinding machine according to the invention are applicable accordingly.
  • This disclosure also relates to a grinding element for a grinding machine according to the invention for the food and feed industry.
  • the grinding element is essentially cylindrical, in particular wood-cylindrical, and has an outer, essentially circular-cylinder jacket-shaped grinding surface.
  • a ratio between the height of the grinding surface and the outside diameter of the grinding element is between 1/8 and 1/12.
  • the invention also relates to a grinding machine with an air suction casing for the food and feed industry.
  • the air suction casing is particularly suitable for retrofitting existing grinding machines.
  • the air suction jacket comprises a jacket surface which can be arranged around a rotor or a chamber wall of a grinding chamber of a grinding machine provided with air duct openings and which can be fluidically connected to an air suction device.
  • the outer surface is designed in such a way that it is not arranged concentrically to the rotor or the chamber wall, but rather that, viewed in the circumferential direction of the rotor or the chamber, a radial distance between the outer surface and the chamber and / or the rotor axis (and thus the grinding surface) increases, preferably increases steadily. More preferably, the jacket surface runs in a spiral.
  • the air suction casing preferably forms a plurality of air suction channels that can be arranged around the rotor or the chamber wall.
  • the air suction channels are preferably arranged one above the other. During operation, an air flow is preferably generated by the air suction device via the air suction channels, so that a negative pressure is created in the grinding chamber and the light, abraded grinding dust can be removed from the grinding chamber.
  • the air suction casing preferably comprises a casing surface and a plurality of radial bottoms which extend between the casing surface and the chamber wall of a grinding chamber.
  • the air suction casing enables a homogeneous distribution of the air flow over the entire height of the rotor and the chamber wall, so that clogging of grinding surfaces and clogging of the air duct openings is largely counteracted. Furthermore, the preferred course of the lateral surface allows the formation of a constant pressure gradient over the entire circumference of the rotor or the chamber wall.
  • a grinding machine 2 which is equipped with a rotor 1.
  • the rotor 1 is arranged in a grinding chamber 14 of a rotor housing 9 of the grinding machine 2, a rotor axis R being arranged parallel to a gravitational vector G.
  • the rotor 1 is composed of ten grinding elements 3, which are stacked in such a way that an air gap 5 is created between two adjacent grinding elements 3.
  • Each grinding element 3 consists of a metallic hollow cylindrical base body 6 with an outer surface 7.
  • a galvanic diamond coating 8 has been applied to the outer surface 7.
  • the rotor 1 is surrounded by a chamber wall 15, which in the Figure 2 is better visible, since one chamber wall half is opened around a hinge 21, as is the case, for example, when cleaning the grinding machine 2.
  • the air duct openings designed as slots are in the Figure 2 partially shown.
  • the rotor 1 has at its upper end a conical cover 22 which is used to distribute the product to be ground.
  • the rotor 1 is driven in the direction of rotation D by an electric motor 12, which is arranged below the rotor 1.
  • a drive shaft 13 of the electric motor 12 is connected to a rotor shaft 23 directly and coaxially to the rotor 1.
  • the rotor 1 is only supported in the area between the electric motor 12 and the rotor shaft 23.
  • the product falls by gravity through the grinding gap S formed between grinding surface 4 and chamber wall 15 with a gap width of 20 mm.
  • the surface of the product is touched by the grinding surface 4 of the rapidly rotating rotor (1500-1800 revolutions / minute) and abraded.
  • brake and stowage bars 17 and 18 are arranged on the chamber wall 15, which cause a product deflection.
  • the brake strips 17 extend in the axial direction of the rotor 1 and the chamber wall 15, which are arranged concentrically, while the stowage strips 18, which in the Figure 8 are visible, are designed as a peripheral segment and extend in the peripheral direction of the chamber wall 15. The radial distance between the grinding surface 4 and the brake bar 17 can be adjusted.
  • annular diaphragm 19 is arranged at the outlet 1, which is particularly good in the Figure 7 is visible and can be moved by an actuator 24.
  • the annular diaphragm 19 can block the outlet 11 so that product is accumulated in the grinding gap S.
  • the annular diaphragm 19 can also determine a passage through the grinding machine 2.
  • the sanding dust produced during sanding of the product which consists of the sanded surface of the product, is removed from the product flow by an air suction device, not shown.
  • a negative pressure is generated in the grinding chamber 14 by the air suction device.
  • the chamber wall 15 is designed as a sieve surface and has a plurality of air duct openings 16 designed as slots, which are dimensioned such that they hold back the product but allow the grinding dust to be sucked off.
  • the air gaps 5 of the rotor allow air to flow through.
  • the resulting grinding dust is thereby entrained by the air flow and removed from the grinding gap S through the openings 16 in the chamber wall 15.
  • four ring channels 25 are arranged around the grinding chamber 14. Each ring channel is connected at one end to the suction port 26 of the air suction device and runs around the grinding chamber 14.
  • Radial bottoms 29 are formed between the annular channels 25 and extend between the chamber wall 15 and a lateral surface 28 of an air suction casing 20. Since a wall of the annular channel 25 is formed by the chamber wall 15, the air can flow out of the grinding chamber 14. The other end of the annular channel 25 has small suction openings which allow a small amount of air to be drawn in from the environment. However, air is mainly (more than 80% of the suction volume) sucked through the inlet openings 27.
  • the lateral surface 28 runs, as in Figure 6 visible, not concentric to the rotor 1 or to the chamber wall 15 but, starting from the small suction openings and in the circumferential direction (same direction of rotation) of the rotor 1, in a spiral shape. As a result, a constant suction power is generated over the entire circumference of the rotor 1, which counteracts clogging and material accumulations.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Crushing And Grinding (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Disintegrating Or Milling (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP16805445.0A 2015-12-04 2016-12-02 Rotor, schleifmaschine, luftabsaugummantelung und schleifelement für eine schleifmaschine Active EP3383540B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP15198064 2015-12-04
PCT/EP2016/079638 WO2017093513A1 (de) 2015-12-04 2016-12-02 Rotor, schleifmaschine, luftabsaugummantelung und schleifelement für eine schleifmaschine

Publications (2)

Publication Number Publication Date
EP3383540A1 EP3383540A1 (de) 2018-10-10
EP3383540B1 true EP3383540B1 (de) 2020-10-28

Family

ID=54783475

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16805445.0A Active EP3383540B1 (de) 2015-12-04 2016-12-02 Rotor, schleifmaschine, luftabsaugummantelung und schleifelement für eine schleifmaschine

Country Status (8)

Country Link
US (1) US10974249B2 (ko)
EP (1) EP3383540B1 (ko)
JP (1) JP6835844B2 (ko)
KR (1) KR102147029B1 (ko)
CN (1) CN108495714B (ko)
BR (1) BR112018010914B1 (ko)
RU (1) RU2702722C1 (ko)
WO (1) WO2017093513A1 (ko)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113477298B (zh) * 2021-07-21 2022-09-27 江西省于都县鲜可农产品有限公司 一种大米除尘装置及其除尘方法
CN114273042B (zh) * 2021-12-24 2023-03-10 莱芜钢铁集团泰东实业有限公司 一种矿渣粉碎分离装置
CN115025838B (zh) * 2022-07-19 2024-01-23 深圳市麦稻科技有限公司 一种谷物磨削设备

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Also Published As

Publication number Publication date
EP3383540A1 (de) 2018-10-10
CN108495714B (zh) 2021-06-25
JP2018537281A (ja) 2018-12-20
BR112018010914B1 (pt) 2021-10-05
WO2017093513A1 (de) 2017-06-08
KR20180089493A (ko) 2018-08-08
US20190070612A1 (en) 2019-03-07
US10974249B2 (en) 2021-04-13
RU2702722C1 (ru) 2019-10-09
JP6835844B2 (ja) 2021-02-24
CN108495714A (zh) 2018-09-04
BR112018010914A2 (pt) 2018-11-21
KR102147029B1 (ko) 2020-08-24

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