EP3960298A1 - Machine pour triturer et séparer les matières biodégradables des matières non biodégradables et installation comprenant ladite machine - Google Patents

Machine pour triturer et séparer les matières biodégradables des matières non biodégradables et installation comprenant ladite machine Download PDF

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Publication number
EP3960298A1
EP3960298A1 EP21193307.2A EP21193307A EP3960298A1 EP 3960298 A1 EP3960298 A1 EP 3960298A1 EP 21193307 A EP21193307 A EP 21193307A EP 3960298 A1 EP3960298 A1 EP 3960298A1
Authority
EP
European Patent Office
Prior art keywords
drum
machine
central rotor
biodegradable material
blades
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.)
Pending
Application number
EP21193307.2A
Other languages
German (de)
English (en)
Inventor
Roberto Tiranti
Matteo Staffolani
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP3960298A1 publication Critical patent/EP3960298A1/fr
Pending legal-status Critical Current

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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
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/0084—Disintegrating by knives or other cutting or tearing members which chop material into fragments specially adapted for disintegrating garbage, waste or sewage
    • 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
    • B02C18/08—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within vertical containers
    • B02C18/10—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within vertical containers with drive arranged above container
    • 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
    • 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
    • B02C18/22—Feed or discharge means
    • B02C18/2225—Feed means
    • B02C18/2258—Feed means of screw type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/22—Crushing mills with screw-shaped crushing means
    • 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
    • B02C2018/162—Shape or inner surface of shredder-housings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/16—Separating or sorting of material, associated with crushing or disintegrating with separator defining termination of crushing or disintegrating zone, e.g. screen denying egress of oversize material
    • B02C2023/165—Screen denying egress of oversize material

Definitions

  • the present patent application for industrial invention relates to a machine for triturating and separating biodegradable material from non-biodegradable material, the latter mainly consisting of plastic and metal packaging materials.
  • a further object of the present invention is an installation comprising said machine.
  • the present invention relates to a bio-triturating machine suitable for processing biodegradable or organic material and for separating non-organic or non-biodegradable material from biodegradable material.
  • the machine is fed with a mass of material composed of expired food products, damaged agricultural products, such as seeds of any kind, fruit and vegetables in general.
  • biodegradable material will henceforth refer to organic waste, both in solid and liquid form.
  • OFMSW organic fraction of municipal solid waste
  • the machine of the present invention is capable of processing the ground organic part in the form of puree that will be used to feed the digesters for the production of biogas.
  • Triturating and separating machines are available on the market, which allow for separating the biodegradable or organic material from scrap and non-biodegradable material. Said machines derive from the machines used in the agricultural sector for grinding vegetable waste and for spreading said vegetable waste on the fields.
  • the mass of material is poured into the drum through the inlet.
  • water is poured into the drum with the addition of bacteria that will be used to trigger the digestion process and to improve the workability of the biodegradable material, which is made more liquid in such a way to be laterally ejected through the holes in the drum.
  • the biodegradable material is discharged by means of centrifugation, that is to say because of the rotation of the central rotor.
  • Rotation takes place at a high speed of about 800/1,200 revolutions per minute.
  • the biodegradable material poured into the drum and properly diluted is triturated by the blades. After being triturated, due to the centrifugal force and to its small size, the biodegradable material is interposed between the heads of the blades and the drum, where it is crushed and is then discharged outside through the holes of the drum. Therefore, the drum acts as a fixed counter-blade and as a mesh with the purpose of imposing the size of the processed product.
  • the biodegradable material is then crushed and discharged from the drum, passing through the holes in the form of a liquid puree, and then precipitates by gravity in a collection tank disposed under the machine.
  • the non-biodegradable or scrap material reaches the upper end of the drum and is ejected through the outlet.
  • the fine puree with the organic or biodegradable material deprived of the inorganic or non-biodegradable material must be as fine as possible because the puree must undergo subsequent treatments that involve the anaerobic digestion using mesophilic or thermophilic bacteria according to the type of installation.
  • the aforementioned bacteria feed on the puree, transforming it into bio-methane. Therefore, the finer the puree is and the more it is purified from inorganic substances, the more efficient, stable and manageable the digestion process of the bacteria will be.
  • machines of the prior art are mainly derived from those of the agricultural sector, they are not suitable for certain types of products with a particular density and they are not suitable for processing products with a certain level of acidity and corrosion; moreover, they are not suitable for high industrial production cycles.
  • ground material obtained with the machines of the prior art is coarse and does not allow to obtain a very fine puree.
  • the central rotor is extremely susceptible to wear and tear and therefore it is often necessary to carry out maintenance operations, to repair or even replace the central rotor.
  • US8722125B2 discloses an apparatus for demucilating, cleaning and washing depulped coffee.
  • the machine comprises:
  • the rotor of such a machine is not capable of energetically throwing the material upwards and of impressing a centrifugal force to the material.
  • CN110094949A discloses a material drying device comprising a rotor disposed inside a non-perforated cylindrical body.
  • the cylindrical body comprises an internal wall and an external wall in coaxial position that define an empty space wherein a high-temperature fluid is introduced.
  • the rotor comprises a rotating shaft, three lifting spiral blades mounted around a lower end of the rotating shaft that form a three-phase structure, blades and scraping knives disposed above the lifting spiral blades. An empty space is generated between the lifting spiral blades and the rotating shaft for the passage of material.
  • the rotor While rotating, the rotor keeps the material against the wall of the cylindrical body in high-turbulence condition, in such a way to generate a heat exchange between the material and the heated internal wall of the cylindrical body, thus drying the material. While drying, because of centrifugation and because of scraping, the material tends to be lifted inside the cylindrical body and is discharged from an outlet.
  • the three lifting spiral blades are not capable of energetically throwing the material upwards, and their function exclusively consists in lifting the material slightly with respect to an inlet used to introduce the material. If heavy material, such as plastic or metal material, enters the cylindrical body together with the material to be processed, the heavy material will not be lifted, and will pass through the empty space from the top towards the bottom, being depositing under the blades. In this way, clogging may be caused, with downtime for maintenance and cleaning operations.
  • the purpose of the present invention is to overcome the drawbacks of the prior art by devising a machine capable of producing a fine puree deprived of impurities of non-organic nature, which is fully automated, safe and efficient.
  • a further scope of the present invention is to devise a machine that is capable of increasing the hourly volumes of processed material compared to the volumes obtained with a machine of the prior art, and is also capable of sorting the material in a single step, adding the puree with bacteria.
  • Another purpose of the present invention is to devise a machine with lower energy consumption than the machine of the prior art.
  • a machine according to the invention is disclosed, which is generally indicated with reference numeral (100).
  • the machine (100) is an integral part of an installation (N), which is shown schematically in Fig. 7 and will be illustrated after describing the machine (100).
  • the machine (100) which has been designed to triturate and separate biodegradable or organic material (M1) from non-biodegradable material (M2), is fed with a mass of material (M) that comprises said biodegradable material (M1) and said non-biodegradable material (M2).
  • the machine (100) comprises:
  • the drum (2) is oriented vertically and the central rotor (1) is arranged inside the drum (2) with its longitudinal axis (Y) disposed coaxially to a central axis of the drum (2).
  • the bearing structure (3) is shaped like a cage and comprises:
  • the lower base (31), the upper head (32) and the inclined uprights (33) define a truncated-conical or truncated-pyramidal structure.
  • Such a configuration of the bearing structure (3) provides the machine (100) with stability and structural rigidity together with a strong contrasting action against the torque and the vibrations that are generated when the machine (100) is in use.
  • the space that is generated between the drum and the protection panels is necessary for the outflow of the puree that is ejected from the drum (2) because during the machine downtimes the puree may stick to the cylindrical lateral wall of the drum, with the risk of clogging. Said space is also necessary for an operator to access the inspection doors (IS) of the drum (2).
  • the cylindrical lateral wall (20) of the drum (2) consists of a reinforced mesh.
  • the drum (2) can be disassembled by means of flanges (25a, 25b) located at the ends (21, 22) of the drum (2).
  • the holes (2c) of the drum (2) have a hexagonal shape and the distance (d) between two parallel sides of each hole (2c) with hexagonal cross-section is comprised between 20 mm and 25 mm, preferably 22 mm.
  • the shape of the holes (2c) ensures a higher efficiency and a longer life of the drum (2), even when using inexpensive materials for the realization of the drum (2).
  • the hexagonal holes (2c) have two opposite vertices that are aligned along an axis parallel to the longitudinal axis (Y) of the central rotor (1); moreover, the distance (w) between the sides of two adjacent hexagons is comprised between 12 mm and 18 mm.
  • the drum (2) with hexagonal holes (2c) allows for increasing the empty/full ratio of the drum (2) compared with the prior art.
  • the drum (2) has an empty/full ratio comprised between 60% and 40%, and between 70% and 30%, preferably 64% empty and 36% full.
  • the machine (100) comprises one or more ducts (2d) that end inside the drum (2) for the introduction of liquid (L), such as water or organic slurry, with the purpose of diluting the biodegradable material (M1) of the mass of material (M) disposed inside the drum (2).
  • liquid (L) such as water or organic slurry
  • the central rotor (1) is disposed inside the drum (2) and is suitably configured for processing the mass of material (M) that is introduced in the drum (2) in such a way to eject the biodegradable material (M1) from the holes (2c) and the non-biodegradable material (M2) from the outlet (2b), thus separating the biodegradable material (M1) from the non-biodegradable material (M2).
  • the central rotor (1) is suitably configured in such a way as to move the mass of material (M) towards the top in the drum (2) and at the same time impart a centrifugal force to the mass of material (M) such that the biodegradable material (M1) is crushed against the internal surface of the cylindrical lateral wall (20) of the drum (2) and is ejected from the holes (2c), whereas the non-biodegradable material (M2) continues to rise inside the drum (2) until it is ejected through the outlet (2b).
  • the central rotor (1) has an upper end (12) and a lower end (11).
  • the central rotor (1) comprises a shaft (10) composed of a cylindrical pipe having an inner diameter comprised between 250 mm and 320 mm, preferably 273 mm, and a thickness comprised between 16 mm and 30 mm, preferably 20 mm.
  • the central rotor (1) further comprises an upper flange (f2) and a lower flange (f1) welded to the shaft (10) on the upper end (12) and on the lower end (11) of the central rotor (1), respectively.
  • the central rotor (1) comprises a plurality of sets of blades (14) that project from the shaft and scrape the mesh of the drum (10).
  • said central rotor (1) comprises two wings (13) with full spiral shape disposed near the lower end (11) of the central rotor (1) below the sets of blades (14).
  • the two wings (13) are arranged in opposite positions.
  • Each wing (13) has a flat spiral shape, that is to say a thread portion shape that protrudes from the shaft (10), without leaving any empty space between the shaft (10) and the wing (13).
  • Each wing (13) is developed along an arc of 180° in clockwise direction.
  • Each wing has an axial development (H) comprised between 200 mm and 400 mm, preferably 275 mm.
  • each wing (13) is substantially shaped like a crescent of moon.
  • each wing (13) has a lower edge (13a) and an upper edge (13b) with pointed shape in contact with the shaft (10).
  • the lower edge (13a) of one of the two wings (13) is disposed in a diametrically opposite position with respect to the lower edge (13a) of the other wing (13).
  • the upper edge (13b) of one of the two wings (13) is disposed in a diametrically opposite position with respect to the upper edge (13b) of the other wing (13).
  • each wing (13) is substantially shaped like a sector of circle.
  • each wing (13) has a lower edge (131a) and an upper edge (131b) with rectilinear shape that project radially from the shaft (10).
  • the lower edge of one of the two wings (13) is disposed in a diametrically opposite position with respect to the lower edge of the other wing and the upper edge of one of the two wings is disposed in a diametrically opposite position with respect to the upper edge of the other wing.
  • each wing (13) is lower than or equal to 30 mm.
  • the two wings (13) are used to energetically throw upwards the mass of material (M) that is introduced through the inlet (2a), in such a way that, instead of being processed downwards, the mass of material (M) is processed homogeneously along the entire drum (2), thus reducing the consumption of the lower parts of the central rotor (1) and of the drum (2).
  • the sets of blades disposed above the two full spiral wings (13) move the mass of material (M) upwards, imparting a centrifugal force on the mass of material (M) so that, while rising, the biodegradable material (M1) is crushed on the internal surface of the cylindrical lateral wall (20) and is ejected from the holes (2c).
  • the sets of blades have the function of triturating the material.
  • said central rotor (1) comprises eight sets of blades (14) arranged in series above the two full spiral wings (13).
  • Each set of blades comprises a pair of blades (14) that project in opposite directions from the shaft (10).
  • Each set of blades is staggered by 90° with respect to the set of blades in upper and/or lower adjacent position.
  • a distance comprised between 120 mm and 180 mm, preferably 150 mm, is provided between two adjacent groups disposed in series.
  • each blade (14) comprises a first side (14a) that is substantially radial to the shaft (10), a second side (14b) that is substantially tangent to the shaft (10) and a top side (14c) that joins the two sides (14a and 14b).
  • the top side (14c) is curved in such a way to follow the curvature of the cylindrical drum (2).
  • the organic material is refined between the top side of the blade and the holes provided on the drum.
  • the first side (14a) is disposed at a higher height than the second side (14b).
  • the blades (14) of the first four sets of blades are made of sheet metal with a thickness comprised between 30 mm and 60 mm, preferably 40 mm, and are coated with a layer of hard material with a thickness comprised between 10 mm and 15 mm.
  • the blades (14) of the second four sets of upper blades are made of sheet metal with a thickness comprised between 20 mm and 40 mm, preferably 30 mm.
  • the outer edge, the inner edge and the upper face of the blades of the second sets of upper blades are coated with a layer of hard material with a thickness approximately comprised between 5 mm and 10 mm.
  • the different thickness makes it possible to reduce the wear of the lower blades and the weight of the rotor because of the lower dimensions of the upper blades, thus reducing energy consumption.
  • the pitch of the wings (13) is larger than the pitch of the blades (14).
  • the two wings (13) have a larger pitch than the blades, they impart a higher speed to the material, which is pushed upwards with a greater force compared to the blades (14). Then, the material meets the blades (14) and is slowed down due to the lower inclination and the shorter pitch of the blades, cutting the organic part, which is more fragile, whereas the wings (13) below continue to push the material upwards, feeding the cycle along the entire length of the rotor.
  • the fact that the wings (13) are full, and not empty prevents any descending flows of the material from going below the two wings (13), with the risk of clogging, and ensures a constant upward thrust that feeds the trituration cycle and the separation cycle, the latter requiring in any case a greater force for the ejection because of the higher weight of the inorganic materials.
  • the revolving support means (S) comprise:
  • the upper revolving support means (7) comprise:
  • said lower section (71b) of the upper shaft (71) is inserted in a seat (D) disposed on the upper end (12) of the central rotor (1), and is keyed to the central rotor (1) by means of a self-centering fixing device (73) interposed between the lower section (7b) of the upper shaft (71) and the central rotor (1).
  • the bearings (72) are mounted on a special support (74) that is integral with the bearing structure (3).
  • the lower revolving support means (8) comprise:
  • the lower fixed pin (81) is splined, by means of a self-centering fixed device (83), to a flanged cup (84) fixed to the lower base (31) of the bearing structure (3).
  • the flanged cup (84) is fixed to the flange (Q) of the lower base (31) by means of fixing screws.
  • each inclined upright (33) comprises a substantially vertical top section (33a) that projects above the upper head (32).
  • the bearing structure (3) comprises:
  • the raised plate (39) rests on support surfaces (33b) of the upper sections (33a) and is fixed to said support surfaces (33b) by means of screws.
  • Grooves (39a) inserted into wings (33c) of the upper sections (33a) are provided for the centering of the raised plate (39).
  • Said wings (33c) inserted in the grooves (39a) facilitate the centering of the motor (V1) with respect to the longitudinal axis (Y) and the insertion of any centering pins on the raised plate (39) that project from the support surface (33b).
  • the cover (37, 38) is composed of two plates, namely a lower plate (38) with a substantially square shape that comprises said lateral openings (H), and an upper plate (39) with a substantially disc-like shape.
  • the two plates are connected by means of screws that are inserted in holes (q1, q2) of the two plates (37, 38) in aligned position.
  • connection between the two plates (37, 38) and the connection of the plates (37, 38) with the head (32) and with the drum (2) is made as follows:
  • Such a configuration of the plates of the cover and of the raised plate allows for rapidly and easily accessing the upper revolving support means (7), the drum (2) and the central rotor (1), thus minimizing the downtime for maintenance operations or breakdowns.
  • the cover (37, 38) is composed of two plates fixed together in order to stiffen the cover, while making the individual components lighter. Furthermore, in the event of replacement due to wear, it will only be necessary to replace the upper plate (38).
  • a further object of the present invention is an installation (N) comprising:
  • the collection tank (5) disposed under the machine (100) also comprises centrifugal pumps and/or hydraulic pumps and pistons (P) which take the liquid puree of biodegradable material (M2) deposited in the collection tank (5) and convey it towards other tanks for subsequent anaerobic digestion treatments.
  • centrifugal pumps and/or hydraulic pumps and pistons P
  • M2 biodegradable material
  • the loading tank (40) has a substantially V-shaped cross-section and has two lateral sides (40a) and a bottom (40b) that joins the two lateral sides (40a) and has a radius of curvature comprised between 200 mm and 240 mm, preferably 220 mm.
  • said two lateral sides (40a) are inclined with respect to a horizontal plane by an angle ( ⁇ ) comprised between 50° and 60°, preferably 54°.
  • the two lateral sides (40a) are internally coated with polyethylene sheets, whereas the bottom (40b) is coated with anti-wear sheet. Such a coating ensures a longer service life of the loading tank (4).
  • said pipe (41) comprises an inlet section provided with sharp plates (410), whereas sharp teeth (420a) are arranged on the outer edge of the blade (420) with helical configuration of the feed screw (42).
  • the mass of material (M) is poured inside the loading tank (40), wherein the feed screw (42) operates, pushing said mass of material (M) inside the pipe and towards the inlet (2a) of the drum (2).
  • the sharp teeth (420a) and the sharp plates (410) triturate and refine the pieces of the mass of material (M) that have a larger diameter than the pipe (41).
  • the central rotor (1) is rotated by the motor (V1) at an angular speed comprised between 700 rpm and 800 rpm.
  • the biodegradable or organic material (M1) is ejected from the drum (2) by means of centrifugation.
  • the mass of biodegradable or organic material (M1) is agitated in a rotary direction after the first trituration step and, due to the centrifugal effect, is crushed on the internal surface of the drum (2), passes through the holes (2c) of the drum (2) and falls in the collection tank (5) below.
  • the biodegradable material is triturated for two reasons:
  • the non-biodegradable material (M2) continues its upward travel, supported by the action of the blades (14) until it reaches the outlet (2b) where it is thrown into the outlet pipe (6) by the centrifugal force.
  • the particular configuration of the central rotor (1) is more efficient than a central rotor of the prior art; in fact, it allows for achieving an hourly production higher than 30-35 m 3 /h with the same energy consumption. Moreover, it is extremely more reliable and considerably reduces maintenance operations compared to a machine of the prior art.
  • the central rotor (1) is rotated at a lower speed than the centrifugal screw/separation screw of the prior art, and therefore the machine (100) has a lower energy consumption than the machine of the prior art, while still having a higher yield and efficiency.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Processing Of Solid Wastes (AREA)
EP21193307.2A 2020-08-27 2021-08-26 Machine pour triturer et séparer les matières biodégradables des matières non biodégradables et installation comprenant ladite machine Pending EP3960298A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT202000020518 2020-08-27

Publications (1)

Publication Number Publication Date
EP3960298A1 true EP3960298A1 (fr) 2022-03-02

Family

ID=73139236

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21193307.2A Pending EP3960298A1 (fr) 2020-08-27 2021-08-26 Machine pour triturer et séparer les matières biodégradables des matières non biodégradables et installation comprenant ladite machine

Country Status (1)

Country Link
EP (1) EP3960298A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114849860A (zh) * 2022-04-06 2022-08-05 滨州学院 一种可自动上料且具有快速降尘机构的超细粉碎设备

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114849860A (zh) * 2022-04-06 2022-08-05 滨州学院 一种可自动上料且具有快速降尘机构的超细粉碎设备
CN114849860B (zh) * 2022-04-06 2023-03-31 滨州学院 一种可自动上料且具有快速降尘机构的超细粉碎设备

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