WO2019064210A1 - Broyeur à percussion destiné au broyage d'une matière en vrac - Google Patents

Broyeur à percussion destiné au broyage d'une matière en vrac Download PDF

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Publication number
WO2019064210A1
WO2019064210A1 PCT/IB2018/057477 IB2018057477W WO2019064210A1 WO 2019064210 A1 WO2019064210 A1 WO 2019064210A1 IB 2018057477 W IB2018057477 W IB 2018057477W WO 2019064210 A1 WO2019064210 A1 WO 2019064210A1
Authority
WO
WIPO (PCT)
Prior art keywords
mill
fact
axis
inlet chamber
chamber
Prior art date
Application number
PCT/IB2018/057477
Other languages
English (en)
Inventor
Stefano Marchetti
Giuseppe Pisani
Original Assignee
Stefano Marchetti
Giuseppe Pisani
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 Stefano Marchetti, Giuseppe Pisani filed Critical Stefano Marchetti
Priority to EP18792477.4A priority Critical patent/EP3687694B1/fr
Priority to PL18792477T priority patent/PL3687694T3/pl
Priority to ES18792477T priority patent/ES2901513T3/es
Priority to RU2020114194A priority patent/RU2764991C2/ru
Publication of WO2019064210A1 publication Critical patent/WO2019064210A1/fr

Links

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
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/02—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft
    • B02C13/06—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor
    • B02C13/09—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor and throwing the material against an anvil or impact plate
    • 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
    • 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
    • B02C13/20—Disintegrating by mills having rotary beater elements ; Hammer mills with two or more co-operating rotors
    • 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
    • B02C13/26—Details
    • B02C13/282—Shape or inner surface of mill-housings

Definitions

  • the present invention relates to an impact mill for grinding loose material.
  • Impact mills for grinding loose material generally comprise a main rotor moveable in rotation around a relative axis and provided with one or more hammers designed to crush the incoming material.
  • Known impact mills also have a secondary rotor provided with a number of blades adapted to convey the material to be ground towards the main rotor.
  • the main rotor and the secondary rotor are placed inside a grinding chamber and an inlet chamber respectively, in communication with each other.
  • Each chamber is delimited by a pair of side walls arranged orthogonally to the relative axis of rotation and by a connecting wall, placed between the side walls to substantially surround the relative rotor.
  • the main rotor has a central core with a cylindrical conformation which extends around the axis of rotation and with which the crushing hammers are associated in an integral manner. More specifically, the crushing hammers have a portion which comes out of the central core and which is adapted to impact the material to be ground and a portion which, on the other hand, is contained inside the base core to allow fixing to same.
  • the known types of mills can be classified as horizontal axis mills or vertical axis mills, depending on the spatial arrangement of the axis of rotation of the main rotor.
  • the present invention relates in particular to horizontal axis mills.
  • This mill envisages that the inlet chamber be arranged laterally to the grinding chamber and that the two chambers be placed in communication with each other through a connecting opening.
  • the secondary rotor and the main rotor rotate in the same direction and the secondary rotor is adapted to convey the material to be ground into the grinding chamber from top to bottom so that it meets the crushing hammers of the main rotor during their rotation.
  • the material to be ground is introduced into the inlet chamber at its bottom, so that the blades of the secondary rotor have to drag it substantially along the entire extension of the corresponding connecting wall before conveying it to the grinding chamber.
  • the material to be ground interposes itself between the corresponding blades and the connecting wall of the inlet chamber, causing wear on the parts subject to rubbing.
  • Conveying the material to be ground into the grinding chamber therefore entails high expenditure of energy, due to the effort the secondary rotor has to make to drag the material, and of materials, due to the wear of the parts subject to rubbing.
  • the main aim of the present invention is to devise an impact mill which overcomes the drawbacks of the prior art.
  • the present invention proposes to increase the grinding efficiency while reducing energy consumption with respect to known mills.
  • one object of the present invention is to reduce the wear of the moving parts, and in particular of the secondary rotor blades.
  • Another object is to optimize the launching phase of the material to be ground inside the grinding chamber according to the state of wear of the parts involved and of the properties of the material itself.
  • Another object of the present invention is to devise an impact mill for grinding loose material, which allows overcoming the aforementioned drawbacks of the prior art within the scope of a simple, rational, easy, efficient to use and cost- effective solution.
  • the aforementioned objects are achieved by the present impact mill for grinding loose material according to claim 1.
  • Figure 1 is a side elevation view of a mill according to the invention in a first operating configuration
  • Figure 2 is a side elevation view of the mill of Figure 1 in a second operating configuration
  • Figure 3 is a side elevation view of the mill of Figure 1 in a third operating configuration.
  • reference numeral 1 globally indicates an impact mill for grinding loose material.
  • the mill 1 comprises a first body 2 defining a grinding chamber 3 inside which is housed at least one main rotor 4 moveable in rotation around a first axis X. More in detail, the grinding chamber 3 is delimited by two side walls 5, arranged transversally with respect to the first axis X on opposite sides with respect to the main rotor 4, and by at least one connecting wall 6 interposed between the side walls 5 and configured so as to surround the main rotor itself, at least in part. The connecting wall 6 therefore extends around the first axis X.
  • the main rotor 4 comprises at least two crushing elements 7 adapted to impact the material to be ground. Alternative embodiments cannot however be ruled out wherein the main rotor comprises a larger number of crushing elements 7. Each crushing element 7 is composed in practice of a corresponding plate made of wear-resistant material and locked together, e.g. by means of threaded means, with a base core 8.
  • each crushing element 7 has a front face facing outwards and intended to impact the material and a rear face associated with the base core 8.
  • the base core 8 is in turn locked together with a motion transmission shaft, not shown in detail in the illustrations, which can be operated in rotation around the first axis X according to procedures known to the expert in the sector.
  • the base core 8 has at least a curvilinear and convex joining surface 8a interposed between two consecutive crushing elements 7.
  • the joining surface 8a corresponds to the portion of a cylindrical surface offset with respect to the first axis X.
  • the base core 8 has two joining surfaces 8a. Each of these joining surfaces 8a has one extremity arranged at the front face of a crushing element 7 and the opposite extremity arranged at the rear face of the other crushing element 7. This conformation of the main rotor 4 is not, however, restrictive, so alternative embodiments cannot be ruled out which do not provide for the presence of the joining surfaces 8a or which provide joining surfaces having only some of the above-mentioned characteristics.
  • the connecting wall 6 has, at least at the upper portion of the grinding chamber 3, a plurality of impact surfaces 9 inclined the one to the other and facing the inside of the grinding chamber itself.
  • Such impact surfaces 9 are inclined in such a way as to define a plurality of consecutive and alternating projections and recesses.
  • At least one recess consisting of two consecutive impact surfaces 9 defines an angle a between 80° and 110°, preferably between 90° and 110°. This is particularly the case for the impact surfaces 9 which are affected by the crushing process, i.e. those located at the upper portion of the grinding chamber 3.
  • At least one projection consisting of two consecutive impact surfaces 9 defines an angle ⁇ between 210° and 240°.
  • the inclination angle of the impact surfaces 9 and the rotation speed of the main rotor 4 are such that the material hit by one of the crushing elements 7 is thrown against one of these impact surfaces 9 following the impact with which it is rejected and hit again by the other crushing element 7 which directs it towards another impact surface 9.
  • the material to be ground is in practice "bounced" between the impact surfaces 9 and the crushing elements 7, resulting in particularly effective crushing.
  • the mill 1 also comprises a second body 10, associated with the first body 2, defining an inlet chamber 11 communicating with the grinding chamber 3 and inside which is housed a secondary rotor 12 moveable in rotation around a second axis Y.
  • the inlet chamber 11 is also delimited by two side walls 13 arranged transversely to the second axis Y on opposite sides with respect to the secondary rotor 12 and by at least one connecting wall 14 interposed between the side walls 13 to surround at least partly the secondary rotor itself.
  • the connecting wall 14 surrounding the secondary rotor 12 at least partly has a substantially circular extension.
  • the secondary rotor 12 has one or more launch elements 15 adapted to contact the material to be ground arranged inside the inlet chamber 11 and to push it towards the grinding chamber 3.
  • the secondary rotor 12 comprises two launch elements 15 arranged on sides diametrically opposite to the second axis of rotation Y.
  • the number of launch elements 15 is generally equal to the number of crushing elements 7.
  • the first and the second axis X and Y are substantially horizontal and are arranged substantially parallel to each other.
  • the inlet chamber 11 is arranged laterally with respect to the grinding chamber 3. More in detail, the inlet chamber 11 is arranged outside the vertical projection of the grinding chamber 3. This arrangement allows optimizing the grinding efficiency as it maximizes the working stroke of the main rotor 4, i.e. the stroke during which the rotor itself is active in the crushing process of the material. Conveniently, the first and the second body 2 and 10 are locked together with each other.
  • the grinding chamber 3 and the inlet chamber 11 are communicating with each other by means of a connecting opening 16 defined on the respective connecting walls 6, 14.
  • the inlet chamber 11 has in turn an inlet opening 17 for the introduction of the material to be ground inside.
  • the inlet opening 17 is arranged at at least one of the side walls 13. More in detail, the inlet opening 17 is arranged along the second axis Y. In the preferred, but not exclusive, embodiments shown in the illustrations, the inlet chamber 11 has only one inlet opening 17 defined on one of the side walls 13, the other side wall 13 being connected to the motion transmission shaft of the secondary rotor 12.
  • the connecting opening 16 is arranged at the lower portion of the inlet chamber 11, so that the material sent from the secondary rotor 12 is directed from the bottom of the inlet chamber 11 towards the inside of the grinding chamber 3.
  • the material to be ground is then sent from the bottom of the inlet chamber 11 towards the upper portion of the grinding chamber 3 or at most in a horizontal direction.
  • the connecting wall 14 of the inlet chamber 11 comprises at least one adjustable portion 14a which is moveable, during use, around an axis of adjustment Z to vary the inlet direction of the material to be ground inside the grinding chamber 3.
  • the adjustable portion 14a e.g., depending on the state of wear of the launch elements 15 and the type of material to be ground, or depending on its specific weight and its degree of humidity, it is possible to change the angle at which the material to be ground is introduced into the grinding chamber 3.
  • the remaining portion of the connecting wall 14, identified in the illustrations by the reference numeral 14b, may be fixed or, preferably, shift along a compensation direction, identified by the reference numeral 29 in the illustrations, to allow it to move close to the adjustable portion 14a after its displacement, so as to maintain the surface continuity of the connecting wall 14.
  • the axis of adjustment Z coincides with the second axis Y.
  • the main rotor 4 and the secondary rotor 12 are counter-rotating to each other. This causes the material to be ground introduced from below inside the grinding chamber 3 to be impacted by the crushing elements 7 and pushed therefrom towards the upper portion of the grinding chamber itself, thus causing an increase in the number of impacts that the material undergoes.
  • the adjustable portion 14a is defined at the lower portion of the connecting wall 14.
  • the adjustable portion 14a is arranged lower than the inlet opening 17, in such a way that the material to be ground which is introduced into the inlet chamber 11 falls directly onto the adjustable portion 14a.
  • the direction of rotation of the secondary rotor 12, the arrangement of the adjustable portion 14a and of the connecting opening 16 are such that the stroke completed by the launch elements 15 to bring the material to be ground from the adjustable portion 14a to the connecting opening 16 is greater than the stroke completed by the secondary rotor itself to return from the latter again to the adjustable portion 14a.
  • the adjustable portion 14a has at least one curvilinear section 18 and at least one rectilinear section 19 which are contiguous to each other. More particularly, the rectilinear section 19 is arranged downstream of the curvilinear section 18 with respect to the direction of rotation of the secondary rotor 12. The rectilinear section 19 thus delimits the lower extremity of the connecting opening 16.
  • the inlet chamber 11 therefore has a conveying channel 20 for conveying the material to be ground, which comprises the connecting opening 16 and is delimited by the rectilinear section 19.
  • the inclination of the rectilinear section 19 with respect to a horizontal direction substantially defines the direction in which the material is conveyed into the grinding chamber 3.
  • the second body 10 comprises at least one base element 21 supporting the adjustable portion 14a in rotation around the axis of adjustment Z.
  • regulating means 22 are provided for regulating the rotation of the adjustable portion 14a around the axis of adjustment Z.
  • the regulating means 22 are of the mechanical type and comprise one or more slots 23 having a curvilinear extension defined on the base element 21 and one or more pins 24, locked together with the adjustable portion 14a, each of which is housed in a sliding manner into a corresponding slot 23.
  • each slot 23 extends along a circumferential arc having its center at the axis of adjustment Z.
  • the adjustable portion 14a is displaced around the axis of adjustment Z manually by an operator.
  • the regulating means 22 comprise at least one sensor means adapted to detect the angular position of the adjustable portion 14a with respect to the axis of adjustment Z, e.g. of the type of a position sensor or the like, movement means for moving the adjustable portion itself and at least one electronic control unit.
  • the electronic control unit comprises at least one memory settable with at least one value of the angular position of the adjustable portion 14a, and comprises a microprocessor programmed to receive a signal from the sensor means relating to the detected angular position, to compare the set position to the detected position and to activate the movement means in the event of the detected position being different from the set position.
  • the adjustment of the angular position of the adjustable portion 14a is substantially automatic.
  • the adjustable portion 14a is moveable in translation with respect to the side walls 13 of the inlet chamber 11 between at least an operating configuration, in which it is substantially aligned with the remaining portion 14b in such a way that the connecting wall 14 is substantially without interruption, and an extraction configuration in which it is misaligned with respect to the remaining portion 14b.
  • the base element 21 is associated moveable in translation with the side walls 13 along an extraction direction 25 and the adjustable portion 14a is locked together in translation with the base element 21.
  • the base element 21 comprises rolling means 26, e.g., of the type of one or more wheels, arranged on a holding surface 27 and adapted to allow the movement of the base element itself along the extraction direction 25.
  • rolling means 26 e.g., of the type of one or more wheels, arranged on a holding surface 27 and adapted to allow the movement of the base element itself along the extraction direction 25.
  • the second body 10 comprises at least one openable wall 28, hinged to the side walls 13 of the inlet chamber 11 and moveable between at least one closed position and one open position. More particularly, in the open position, the openable wall 28 is rotated with respect to the closed position and defines the extension of the holding surface 27. As a result of the movement of the openable wall 28 to the open position, the base element 21 and the adjustable portion 14a can be shifted from the operating configuration to the extraction configuration.
  • the material to be ground which is introduced into the inlet chamber 11 through the inlet opening 17 falls by gravity and deposits at the adjustable portion 14a.
  • the launch elements 15 therefore contact the material to be ground and drag it towards the connecting opening 16.
  • the position of the adjustable portion 14a will have to be changed by means of the regulating means 22. This operation can be carried out either by keeping the openable wall 28 in the closed position or by moving it to the open position.
  • the regulation is carried out by opening a door that makes the pins 24 accessible from the outside.
  • the base element 21 is extracted by sliding it on the holding surface 27 in the extraction direction 25.
  • the adjustable portion 14a has been brought from the operating configuration to the extraction configuration, it is possible to access the regulating means 22 and thus vary the position of the adjustable portion itself.
  • the operator adjusts the pins 24, making them slide inside the corresponding slots 23, so as to change the position of the adjustable portion 14a with respect to the remaining portion 14b and, consequently, the inclination of the rectilinear section 19.
  • the adjustable portion 14a Once the adjustable portion 14a has been fixed in the desired position, it is returned to the operating configuration by sliding the base element 21 in the opposite direction to the previous one.
  • the material to be ground entering the grinding chamber 3 is then hit by the crushing elements 7 which, in addition to causing an initial decrease in size, project it against the impact surfaces 9.
  • the described invention achieves the intended objects and, in particular, the fact is underlined that the launching of the material from the bottom of the inlet chamber towards the inside of the grinding chamber and the possibility of regulating the launch direction make it possible to optimize the effectiveness of the action of the crushing elements.
  • the adjustable portion around the regulating axis, it is possible to vary the trajectory covered by the material to be ground according to its physical properties, such as specific weight, humidity and size, as well as to the wear of the parts involved in the launch phase.
  • the working stroke completed by the secondary rotor to convey the material to be ground into the grinding chamber is therefore minimal, thus making it possible to reduce energy costs and wear on the parts involved in the launch phase.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)

Abstract

L'invention concerne un broyeur à percussion (1) destiné au broyage d'une matière en vrac, le broyeur comprenant : un premier corps (2) définissant une chambre de broyage (3) logeant à son intérieur au moins un rotor principal (4) mobile en rotation autour d'un premier axe (X); un second corps (10) définissant une chambre d'entrée (11) de la matière à broyer en communication avec la chambre de broyage (3) et logeant à son intérieur au moins un rotor secondaire (12) mobile en rotation autour d'un second axe (Y), le rotor secondaire (12) étant conçu pour envoyer la matière à broyer à l'intérieur de la chambre de broyage (3); la chambre d'entrée (11) et la chambre de broyage (3) étant délimitées par au moins deux parois latérales (5, 13) agencées sensiblement transversalement aux premier et second axes (X, Y) respectivement, et par au moins une paroi de liaison (6, 14) interposée entre les parois latérales respectives (5, 13) afin d'entourer au moins partiellement le rotor pertinent (4, 12), les premier et second axes (X, Y) étant agencés sensiblement horizontaux et parallèles entre eux. La chambre d'entrée (11) est agencée latéralement par rapport à la chambre de broyage (3) et lesdites chambres sont en communication l'une avec l'autre au moyen d'une ouverture de liaison (16) définie sur les parois de liaison respectives (6, 14), l'ouverture de liaison (16) étant agencée au niveau de la partie inférieure de la chambre d'entrée, de sorte que la matière envoyée par le rotor secondaire (12) soit dirigée de la partie inférieure de la chambre d'entrée vers la chambre de broyage (3), la paroi de liaison (14) de la chambre d'entrée (11) comportant au moins une partie réglable (14a) mobile en rotation, lors de l'utilisation, autour d'un axe de réglage (Z) afin de varier la direction d'entrée de la matière à broyer à l'intérieur de la chambre de broyage (3).
PCT/IB2018/057477 2017-09-27 2018-09-27 Broyeur à percussion destiné au broyage d'une matière en vrac WO2019064210A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP18792477.4A EP3687694B1 (fr) 2017-09-27 2018-09-27 Broyeur à percussion destiné à broyer des matières en vrac
PL18792477T PL3687694T3 (pl) 2017-09-27 2018-09-27 Młyn udarowy do rozdrabniania materiałów sypkich
ES18792477T ES2901513T3 (es) 2017-09-27 2018-09-27 Molino de impacto para moler material suelto
RU2020114194A RU2764991C2 (ru) 2017-09-27 2018-09-27 Ударная дробилка для измельчения рыхлого материала

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102017000107927 2017-09-27
IT102017000107927A IT201700107927A1 (it) 2017-09-27 2017-09-27 Mulino ad impatto per la macinazione di materiale incoerente

Publications (1)

Publication Number Publication Date
WO2019064210A1 true WO2019064210A1 (fr) 2019-04-04

Family

ID=61024900

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2018/057477 WO2019064210A1 (fr) 2017-09-27 2018-09-27 Broyeur à percussion destiné au broyage d'une matière en vrac

Country Status (6)

Country Link
EP (1) EP3687694B1 (fr)
ES (1) ES2901513T3 (fr)
IT (1) IT201700107927A1 (fr)
PL (1) PL3687694T3 (fr)
RU (1) RU2764991C2 (fr)
WO (1) WO2019064210A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0062011A2 (fr) * 1981-03-31 1982-10-06 Tarcisio Pozzato Broyeur à marteaux à axe horizontal
EP0583515A1 (fr) * 1992-07-31 1994-02-23 Evarest Boleslavovich Komarovsky Broyage à impact pour de la roche et des minerais
WO2002022269A1 (fr) * 2000-09-14 2002-03-21 Mills Patent Management Broyeurs a marteaux ameliores secondaires et tertiaires, reversibles et non reversibles
EP2908954A1 (fr) * 2012-09-24 2015-08-26 GEI S.r.l. Broyeur à percussion destiné à broyer des matières en vrac

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0062011A2 (fr) * 1981-03-31 1982-10-06 Tarcisio Pozzato Broyeur à marteaux à axe horizontal
EP0583515A1 (fr) * 1992-07-31 1994-02-23 Evarest Boleslavovich Komarovsky Broyage à impact pour de la roche et des minerais
WO2002022269A1 (fr) * 2000-09-14 2002-03-21 Mills Patent Management Broyeurs a marteaux ameliores secondaires et tertiaires, reversibles et non reversibles
EP2908954A1 (fr) * 2012-09-24 2015-08-26 GEI S.r.l. Broyeur à percussion destiné à broyer des matières en vrac

Also Published As

Publication number Publication date
EP3687694A1 (fr) 2020-08-05
IT201700107927A1 (it) 2019-03-27
RU2764991C2 (ru) 2022-01-24
PL3687694T3 (pl) 2022-01-17
EP3687694B1 (fr) 2021-08-25
RU2020114194A3 (fr) 2021-11-29
ES2901513T3 (es) 2022-03-22
RU2020114194A (ru) 2021-10-27

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