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
  • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
  • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
  • B02C18/16—Details
  • B02C18/24—Drives
• • 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
  • B02C4/10—Crushing or disintegrating by roller mills with a roller co-operating with a stationary member
  • B02C4/26—Crushing or disintegrating by roller mills with a roller co-operating with a stationary member in the form of a grid or grating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
  • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting 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
  • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
  • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
  • B02C18/062—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives with rotor elements extending axially in close radial proximity of a concentrically arranged slotted or perforated ring
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
  • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
  • B02C18/16—Details
  • B02C18/18—Knives; Mountings thereof
  • B02C18/186—Axially elongated knives
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
  • E04F11/00—Stairways, ramps, or like structures; Balustrades; Handrails
  • E04F11/18—Balustrades; Handrails
  • E04F11/1863—Built-in aids for ascending or descending stairs

Definitions

• High flow milling device having an adjustable grinding operation
• the present invention relates to a grinding device that can implement a grinding operation that adjusts the grinding parameters and allows a high flow of the ground material.
• the material to be milled is milled between a rotating rotor and a sieve.
• the desired properties of the milled material such as particle size and particle flow velocity, can be obtained by appropriately selecting the appropriate milling parameters, such as the rotational speed of the rotor and / or the amplitude of oscillation and frequency in the case where the rotor is oscillating.
• Proper selection of the appropriate grinding parameters is also critical to avoid a significant increase in temperature which could be detrimental to the quality of the milled material. During most grinding operations, however, it can be difficult to choose which parameters are
• the material can change its properties, for example due to the high temperature and / or humidity, which makes the grinding parameters insufficient.
• the present invention relates to a grinding device for implementing a grinding operation, comprising:
• a grinding unit including a body which has a grinding chamber, which can be filled with a grinding material, a rotor rotatably mounted about an axis in the body, a sieve, and a drive unit controlling the movements the rotor with respect to the screen during the grinding operation;
• the drive unit is adapted to provide oscillation movement to the rotor about the axis, the oscillation angle being varied during the grinding operation;
• the grinding chamber is configured to direct the product to be milled in a direction substantially parallel to the axis of rotation of the rotor.
• the grinding device of the invention allows to implement a grinding operation in which it is possible to adjust the grinding parameters, while allowing a high flow rate of the ground material.
• Figure 1 shows a grinding device 1 comprising a rotor and a screen, according to one embodiment
• Figure 2 shows a perspective view of the screen
• Figure 3 shows a detailed view of the rotor, according to one embodiment.
• FIG. 1 shows a grinding device 1 for implementing a grinding operation, according to one embodiment.
• the grinding unit 2 comprises a body 3 comprising a grinding chamber 20.
• a rotor 4 is rotatably mounted about an axis 5 in the body 3.
• a screen 21 is mounted concentrically around the rotor 4.
• a drive unit 60 (only partially visible in FIG.
• the rotor 4 is mounted substantially vertically,
• the material to be ground can be introduced into the grinding chamber 20 from above, through an inlet 32. During the grinding operation, the material is ground by the combined action of the rotor 4 and the sieve 21 and the crushed material which has passed through the sieve 21 leaves the grinding unit 2 through an outlet 33 (from the bottom).
• the grinding device 1 comprises a transmission element 61 comprising a grinding shaft 6 on which the rotor 4 is mounted.
• the transmission element 61 is configured to transmit the drive of the drive unit 60 to the grinding shaft 6.
• the grinding shaft 6 is mounted in a grinding shaft bearing 64 and the transmission shaft 63 is mounted in a transmission bearing 65.
• the transmission element 61 can also be configured to drive the rotor 4 directly from the top or from the bottom, that is to say ie, provide a functional connection according to the orientation of the axis 5 of rotation of the rotor 4 (direct transmission).
• the transmission element 61 also comprises a connection unit 30 for functionally connecting the grinding unit 2 to the drive unit 60, via the transmission element 61.
• the connection unit 30 is configured to enable the transmission element 61 to be connected to the drive unit 60 removably.
• the connection of the transmission member 61 to the drive unit 60 may include a "tri-clamp" type collar or other suitable quick connect system.
• the drive unit 60 drives the grinding shaft 6 in rotation about the axis 5.
• the movements of the rotor 4 with respect to the sieve 21 can be controlled so as to carry out the grinding operation, that is to say, to allow the fractionation of the material to be ground by the combined action of the rotor 4 and the sieve 21, according to
• the grinding chamber 2 configured so that the material flows from top to bottom (between the inlet 32 and the outlet 33), in a direction substantially parallel to the axis 5 of rotation of the rotor 4, allows to take advantage of the gravity and increase the flow rate of the ground material with respect to a device in which the rotor and the screen are oriented horizontally.
• the flow rate of the milled material is also increased by the larger surface of the sieve 21 concentric with respect to a sieve placed under a rotating rotor along a horizontally oriented axis.
• connection unit 30 includes an adapter module 31 configured to adapt the characteristics of the drive unit 60 to the needs of the grinding unit 2 functionally connected to the unit of operation. 60. It is thus possible to connect functionally different grinding units 2 depending on the grinding process that is desired to perform.
• An advantage of the connection unit 30 is that a single drive unit 60 can be used for a plurality of grinding chambers 2, reducing the costs of
• the flow rate of the material to be milled entering the grinding chamber 2 can be regulated by the addition of a metering system (not shown).
• the flow rate can also be changed by driving the material into an air stream (not shown).
• a protective air flow 50 may be injected along the rotor shaft 5, directed towards the rotor 4 so as to prevent infiltration of the material to be ground in the transmission element 61 and avoid a risk of overheating of the transmission element 61 and the rotor 4.
• the drive unit 60 and / or the transmission element 61 can integrate a cooling system to allow heat sensitive materials to be processed.
• the grinding device 1 can be adapted for cryogenic grinding or vacuum grinding.
• the grinding device 1 can be used under an inert atmosphere to make it possible to treat explosive products.
• FIG. 2 shows a perspective view of the screen 21, according to one embodiment.
• the screen 21 is cylindrical and can be mounted in the body 3 of the grinding chamber 2 concentrically with the axis 5 of rotation of the rotor 4.
• the screen 21 is mounted between two support rings 22
• the lower support ring 22 comprises a sieve bearing 24 for mounting the sieve 21 on the grinding shaft bearing 64.
• the screen 21 may consist of a filtering portion 25 and a support portion 26.
• the support portion 26 is provided with large openings 27 through which the milled material passes through the filtering portion 25 when the grinding operation.
• the support portion 26 may consist of a thick and solid element, ensuring the sieve 21 a certain rigidity.
• the filtering portion 25 may be composed of thin openings to facilitate a fluid flow rate of the materials.
• the screen 21 may be made of a metal alloy material.
• the filter portion 25 and the support portion 26 are integrally formed so that the screen 21 is formed integrally.
• Such a screen 21 makes it possible, as opposed to sieves made up of several glued or welded elements, to prevent the powdery materials from intruding into cavities, between the filtering part 25 and the support part 26.
• the cylindrical sieve 21 allows a more large grinding surface.
• the screen 21 may be coupled to a vibration generator (not shown) so as to facilitate the flow of the ground material through the sieve 21.
• the effect of the vibration prevents the material from coming s agglomerating in the openings of the screen 21 during the grinding operation, thus allowing a continuous flow of the milled material, without human intervention. Indeed, the vibrations generated by the
• Vibration generator is transmitted to the filter portion 25 of the screen 21 in a very efficient manner. This leads to an acceleration of the circulation of the crushed material, in particular to avoid the risk of stagnation of powdery materials.
• the sieve 21 formed in one piece is advantageous since the latter is devoid of bonding areas or welding and does not risk being weakened by the vibrations exerted by the vibration generator.
• the rotor 4 comprises a bearing 40 arranged to be mounted on a grinding shaft 6 parallel to the axis 5.
• a plurality of blades 41 are disposed concentrically with the axis 5 of rotation of the rotor 4 and substantially parallel to this axis 5.
• the rotor 4 comprises a disc 42 extending radially from the bearing 40.
• the blades are mounted at the In the illustrated example, the rotor comprises five blades 41 distributed angularly equidistant. However, a different number of blades 41 and a different arrangement are also possible depending on the needs of the grinding process.
• the disc 42 occupies substantially the entire surface under the screen 21 so as to direct the material to be grinded on the sides, that is to say passing through the sieve 21.
• the disc 42 has a frustoconical shape so that the material to be ground is guided towards the grinding zone, that is to say towards the blades 41 and the sieve 21. In this way, the form
• frustoconical disc 42 prevents the material to grind lies too long (in other words, avoids a retention zone of the material to grind) in the region between the rotor bearing 40 and the blades 41.
• the movement of the rotor 4 relative to the screen 21 comprises a rotary movement about the axis 5.
• the rotational speed of the rotor 4 can be varied, for example, according to the grinding process , the type of rotor 4 and / or sieve 21 and the material to be ground.
• the rotational speed of the rotor 4 can also be varied during the grinding process.
• the movement of the rotor 4 relative to the screen 21 also comprises an oscillation movement with an oscillation frequency that can be varied during the grinding operation.
• the rotor 4 can be pivoted in one direction or the other with respect to the screen 21.
• the oscillation movement can be done with an oscillation angle
• predetermined i.e. with a predetermined oscillation amplitude
• the predetermined oscillation angle can have a value between 0 and 360 °.
• the predetermined oscillation angle may also correspond to several complete turns in the same direction.
• the rotor can oscillate with an oscillation frequency between 0 and 4 Hz.
• the oscillation frequency can be varied during the grinding operation.
• a vibratory movement of the rotor 4 can be obtained when the latter is oscillated with an oscillation frequency of less than approximately 2 °.
• an offset of the oscillation angle during the grinding operation for example at each oscillation of the oscillation movement of the rotor 4.
• Such an offset of the oscillation angle means that the angular position of the rotor 4 is shifted by the offset value of the oscillation angle after the completion of an oscillation cycle (an oscillation motion).
• the offset of the oscillation angle can be between 0 and 90 °.
• the offset of the oscillation angle can be varied during the grinding operation.
• the drive unit 60 may comprise a controller configured to determine grinding parameters on the basis of signals provided by a sensor. The parameters determined by the controller can then be used to control the drive unit 60 so as to drive the rotor 4 according to the determined parameters. In this way, the grinding operation can be optimized depending on the material to be ground and the grinding conditions, which are measured by the sensor. The movements of the rotor 4 can therefore be controlled in real time during the grinding operation.
• the movements of the rotor 4 relative to the sieve 21 described above can be adjusted according to the grinding parameters determined by the controller on the basis of the signals provided by the sensor.
• a first longitudinal face 43 of the blade 41 has a profile which differs from a second longitudinal face 44 opposite to the first face 43.
• one of the first or second face 43, 44 corresponds to the leading edge, that is to say the side of the blade 41 which faces the material when When the rotor 4 rotates in the opposite direction, the other face 44, 43 corresponds to the leading edge. In this way, it is possible to perform two different grinding processes according to the direction of rotation of the rotor 4.
• the blades 41 are configured to exert a thrust to the sieve 21 of the material.
• This type of configuration of the blades 41 is particularly suitable when the rotor rotates at low speed, for example, when the rotor speed 4 is between 0 and 200 rpm.
• An example of such a configuration is shown in Figure 3, wherein the blades 41 of substantially square section are disposed with the faces 43, 44 at an angle ⁇ relative to a radius 45 of the rotor 4.
• Such a configuration of blades 41 has the effect that the ground material is pushed towards the screen 21 by the inclination of the faces 43, 44 with respect to the sieve 21.
• the angle ⁇ can vary between 10 ° and 80 °, but is preferably between 40 ° and 60 °.
• the blades may be arranged with one of the faces substantially parallel to the screen 21, that is to say, with an angle ⁇ substantially zero or any other angle ⁇ between 0 ° and 10 ° and between 80 ° and 90 °.
• the rotor speed 4 may also be greater than 200 rpm.

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• Engineering & Computer Science (AREA)
• Food Science & Technology (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Crushing And Grinding (AREA)
• Crushing And Pulverization Processes (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=60719747

Family Applications (1)

Country Status (4)

Families Citing this family (2)

Family Cites Families (20)

• 2016
  • 2016-06-28 CH CH00820/16A patent/CH712632A2/fr unknown
• 2017
  • 2017-06-23 WO PCT/IB2017/053753 patent/WO2018002786A1/fr unknown
  • 2017-06-23 US US16/309,636 patent/US11440019B2/en active Active
  • 2017-06-23 EP EP17737057.4A patent/EP3474995B1/de active Active

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