EP3772382A1 - Dispositif de compression utilisant des vibrations ultrasoniques - Google Patents

Dispositif de compression utilisant des vibrations ultrasoniques Download PDF

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Publication number
EP3772382A1
EP3772382A1 EP19190117.2A EP19190117A EP3772382A1 EP 3772382 A1 EP3772382 A1 EP 3772382A1 EP 19190117 A EP19190117 A EP 19190117A EP 3772382 A1 EP3772382 A1 EP 3772382A1
Authority
EP
European Patent Office
Prior art keywords
compression
ultrasonic
drive shaft
compaction device
process material
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.)
Withdrawn
Application number
EP19190117.2A
Other languages
German (de)
English (en)
Inventor
César Carrasco
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.)
AO Ideas GmbH
Original Assignee
AO Ideas GmbH
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 AO Ideas GmbH filed Critical AO Ideas GmbH
Priority to EP19190117.2A priority Critical patent/EP3772382A1/fr
Publication of EP3772382A1 publication Critical patent/EP3772382A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/005—Control arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/005—Control arrangements
    • B30B11/006—Control arrangements for roller presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/30—Feeding material to presses
    • B30B15/302—Feeding material in particulate or plastic state to moulding presses
    • B30B15/308—Feeding material in particulate or plastic state to moulding presses in a continuous manner, e.g. for roller presses, screw extrusion presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/28—Presses specially adapted for particular purposes for forming shaped articles

Definitions

  • the invention relates to a compression device by means of which a process material can be compressed.
  • Compaction devices of this type often have a compression screw which is rotatably mounted in a compression pipe. Process material, in particular bulk material, is passed through the compression pipe, compressed using the compression screw and then often pressed into the shape of pellets.
  • worm screws were used to transport a process material, especially bulk material, from one location to another. Auger screws were also used to compact materials. Screw compactors are suitable for simple and uncomplicated compaction of materials. Through the in the US6186060B1 described screw compactor, agricultural products are compacted and pressed into the form of pellets.
  • the US3991668A discloses an apparatus intended for compacting waste.
  • the compression device comprises a funnel with an adjoining compression pipe in which a rotating worm screw extends. During the rotation of the worm screw, the waste material is transported axially through the compression pipe and compacted.
  • the US5664492A discloses an apparatus for compacting metal chips.
  • the device comprises a sealing cylinder in which a worm screw is rotatably mounted, by means of which the Metal chips are compacted and then processed into pellets.
  • the US20090280211A1 describes a compression device comprising a compression pipe with a conveying screw, to which two rollers or rollers are connected, which press the process material, which is compacted or compacted in the compression pipe, into pellets.
  • the polymer powder which is supplied with a bulk density of less than or equal to 240 kg / m3, is compressed between two compacting rollers at a temperature of less than 130 ° C. in order to obtain a compacted polymer material.
  • the two compression rollers between which a gap or a compression gap of 0.5 mm to 10 mm is provided, work at a speed of rotation in the range of 3 - 30 revolutions per minute, resulting in a pressure of 0.5 to 5 MPa in the compression gap.
  • the bulk material density can be increased accordingly if the density of the bulk material in the compression pipe is already increased accordingly.
  • High forces occur within the compression pipe, which require correspondingly large drive motors and a correspondingly high drive power. After a long period of operation, the high forces can also lead to signs of wear.
  • Another disadvantage is that high forces act selectively on the processed process material and can disadvantageously change its structure. Furthermore, asymmetrically occurring high forces can lead to a bending of the compression screw, which can change the dimensions of the material flow and its density profile.
  • the present invention is therefore based on the object of creating an improved device for compacting a process material, in particular a solid or powdery bulk material.
  • the compression device should allow any process materials or bulk goods, in particular powdery bulk goods, to be advantageously compressed.
  • the process material is to be compressed to a largely uniform material flow by means of the compression device.
  • the resulting material flow should have a largely uniform density profile and an advantageous material structure that allows it to be processed further in a particularly simple and reliable manner. It should advantageously be possible to form pellets or chips with the desired consistency from the compacted material.
  • the compacted end product should be provided in optimal quality, in particular with a uniform consistency and strength.
  • the device which is used to compact a process material, comprises at least one drive shaft, which is connected to a drive motor, which is rotatably mounted in a bearing device and which is connected to a metal compression screw that is rotatably held in a compression tube, at the input of which is to be processed Process material can be fed in and the compacted process material can be removed from the outlet.
  • the drive shaft holds an ultrasonic transducer which is connected to an ultrasonic generator and through which Ultrasonic energy can be coupled into the compression screw via the drive shaft.
  • the ultrasonic generator is intended to emit alternating voltage signals in the frequency range of preferably 15 kHz to 45 kHz.
  • the ultrasonic generator is preferably designed for continuous change and / or for keying of the frequency and / or for changing the amplitude of the alternating voltage signals.
  • the frequency of the output signal which is in the frequency range mentioned, is preferably changed with a keying frequency which is in the range from 10 Hz to 2 kHz.
  • the output signal of the ultrasonic generator is keyed ten times per second with a keying frequency of 10 Hz between the ultrasonic frequencies of 25 kHz and 35 kHz. With the keying frequency, a whole sequence of ultrasonic frequencies of e.g.
  • 25 kHz, 30 kHz and 35 kHz can be run through.
  • a continuous frequency change can also be carried out. For example, a scan between two or more ultrasonic frequencies is carried out ten times per second with a change frequency of 10 Hz.
  • the described changes in the ultrasonic frequencies ensure that no wave nodes occur at the friction points within the compression pipe and that the effect of the ultrasonic signals occurs without any gaps.
  • the process material flows around the thread of the compression screw and is evenly compressed. Force peaks that could change the structure of the compressed process material or break the laminar flow of the process material are avoided. This advantageous conveyance of the process material results in an advantageous end product. The elimination of frictional forces also results in a higher speed of the material flow.
  • the advantageous material flow can be realized with less power and less powerful motors.
  • the compression device can process practically all process materials, in particular process materials from the aforementioned industrial sectors, such as chips of all kinds, natural products of all kinds, waste of any composition, as well as powdery process materials and granulates in all conceivable states with the advantages mentioned.
  • the compression device can comprise any metal compression screw.
  • the compression screw is, for example, an Archimedes screw, a worm screw or a screw with a differently designed thread, such as a helical, helical or spiral thread.
  • the compression screw preferably has a helical or helical thread, which can grasp and transport process material well.
  • the connecting screw can have a thread which has a constant or continuously or gradually changing pitch.
  • the thread can have a greater pitch in order to collect uncompacted process material and to convey it quickly.
  • the pitch height can decrease so that a high pressure can be achieved without a high counter-torque acting on the drive shaft.
  • the diameter of the thread of the compression screw can reduce from the inlet to the outlet of the compression pipe. With a corresponding course of the diameter of the compression pipe, the volume available for the transport of the process material is reduced, which is why the process material is correspondingly compressed during the transport.
  • the connecting pipe has a diameter adapted to the compression screw.
  • the connecting pipe can, for example, be at least partially cylindrical and / or at least partially conical, or have a different course of diameter or cross-section in accordance with the compression screw.
  • the drive shaft is provided with a contacting device for the transmission of electrical energy, in particular an alternating voltage, to the ultrasonic generator.
  • the contacting device preferably comprises slip rings and sliding contacts lying thereon, via which alternating voltage signals and / or direct voltage signals, optionally control signals, can be transmitted to the ultrasonic transducer or to a control device or switching device that may be provided there.
  • the ultrasonic transducer preferably has a piezoelectric transducer, which preferably comprises a plurality of piezoelectric elements.
  • the piezoelectric elements are clamped between two metal plates that are positively or non-positively connected or welded to the drive shaft, and are preferably individually connected to the ultrasonic generator by means of connection contacts. Vibrations of the piezoelectric elements are transmitted via the metal plates to the drive shaft and on to the compression screw.
  • the metal plates can each be arranged as screw nuts on a thread of the drive shaft. By tightening the nuts, the piezo elements are tensioned and at the same time an optimal connection between the nuts and the drive shaft results. It is also advantageously possible to use only one screw nut, by means of which the piezo elements can be pressed against a metal plate firmly connected to the drive shaft.
  • the shaft of the compression screw and the drive shaft can be made in one piece.
  • the drive shaft is connected to the motor shaft of the drive motor in one piece or by a coupling.
  • the piezoelectric elements are ring-shaped so that they can enclose the drive shaft. This configuration results in a compact structure with maximum effect. Five to twenty piezo elements are preferably provided. The piezo elements are preferably separated from one another by contact elements and, if appropriate, insulation plates.
  • Alternating voltages in the ultrasonic range can cause the piezo elements to vibrate, which are then transmitted to the compression screw and its thread. These ultrasonic vibrations prevent firm contact between the compression screw on the one hand and the process material on the other. The static friction and / or sliding friction and thus the frictional forces that result between the compression screw and the process material are thus significantly reduced.
  • At least one pair of rollers adjoins the outlet of the compression pipe.
  • the rollers or rollers which are driven jointly by a motor or each by a motor, delimit a roller gap which is in the range of a fraction of a millimeter or in the range of 1 mm - 10 mm, preferably in the range of 1 mm - 4 mm.
  • the nip depends on the current process. Reduced gap sizes are provided in the pharmaceutical or chemical industry, possibly the food industry.
  • the rollers are rotated at the rotational speeds described at the beginning or further adapted to the processes.
  • the compression device can have several compression pipes each with a compression screw and / or several downstream pairs of rollers. In this way it is possible to increase the capacity of the compression device and to use different device parts, such as at least one energy supply, at least one ultrasonic generator and at least one drive motor, in common.
  • the exit of the compression pipe faces the roller gap, so that the material compressed in the compression pipe can enter the roller gap and is further deformed and / or compressed therein.
  • the compacted process material is preferably deformed into pellets, chips or strips with a thickness corresponding to the roller gap.
  • a cutting device or milling device is preferably provided, which cuts the rolled process material into pieces.
  • an optionally additional ultrasonic generator outputs alternating voltages to at least one additional ultrasonic transducer or transducer through which ultrasonic waves can be transmitted to at least one of the rollers.
  • An additional ultrasonic transducer is preferably assigned to each roller, through which ultrasonic waves can be transmitted to the outer surfaces of the assigned roller.
  • the additional ultrasonic transducers are preferably arranged on the inside of the preferably hollow-cylindrical rollers.
  • the additional ultrasonic transducers preferably also comprise a package with piezo elements, the dimensions of which are preferably adapted to the inner surface of the rollers or to the bearing shafts of the rollers.
  • At least two compression units are provided, each with a compression tube and an adjoining pair of rollers, the end products of which are fed together to a further pair of rollers in which a laminate is formed.
  • Fig. 1 shows an example of a device 1 according to the invention, which is provided for compacting a process material, in a basic configuration.
  • the compression device 1 comprises a compression pipe 10 at the inlet 11 of which process material can be supplied and at the outlet 12 of which compressed process material can be removed.
  • the compression pipe 10 is conical or frustoconical and tapers from its inlet 11 to the outlet 12.
  • a compression screw 3 with a thread 31 is arranged in the compression pipe 10, which captures the supplied process material at the inlet 11 of the compression pipe 10 and conveys it to the outlet 12 of the compression pipe 10 through the compression screw 100 provided in the compression pipe. During this process, the process material is compacted.
  • the compression pipe 10 and the compression screw 3 can be designed differently.
  • the compression screw 3 is a worm screw with a thread 31, the pitch of which decreases from the inlet 11 of the delivery pipe 10 to the outlet 12.
  • the thread 31 is designed conically in accordance with the shape of the compression pipe 10.
  • the compression screw 3 is connected to a drive shaft 2 which is rotatably held in a bearing device 5.
  • the storage device 5 and the compression pipe 10 are held in a stable manner by a frame, chassis or a mounting structure 1000.
  • the drive shaft 2 and the shaft 30 of the compression screw 3 form a one-piece unit or are connected to one another by a shaft coupling.
  • the drive shaft 2 is driven by a motor 8 and is connected in one piece to the motor shaft 80 or coupled thereto by a shaft coupling.
  • the drive motor 8 is supplied with electrical energy by a power supply unit 900.
  • the drive motor 8 is controlled by a control unit 9 which is provided with a control program 99. All processes within the compression unit 1 can preferably be controlled by means of the control program 99.
  • the drive motor 8 is preferably controllable, for example with regard to the rotational speed, and an ultrasonic generator 7 with regard to the output of alternating voltages in the frequency range of ultrasonic waves.
  • the frequency and / or the amplitude of the alternating voltages can preferably be controlled. Sequences which can be called up and determine frequency changes and amplitude changes within an interval are preferably stored in the control unit 9.
  • the drive motor 8 is controlled by control signals 81 which are transmitted directly to the electric motor 8 or by control signals 91 which are transmitted to the power supply unit 900, which supplies the drive motor 8 with electrical energy accordingly.
  • the ultrasonic generator 7 is controlled by control signals 70 and supplies corresponding alternating voltages via a cable 71 and a contacting device 4 to the ultrasonic transducer 6.
  • the contacting device 4 has sliding contacts 41, 43 which bear against slip rings 42, 44 which are rotatably connected to the drive shaft 2.
  • the multi-core cable 71 is connected to the sliding contacts 41, 43. AC voltages in the frequency range of the ultrasonic waves are transmitted via the sliding contacts 41.
  • the corresponding slip rings 42 are on Connecting cable 72 is connected, via which the alternating voltages are transmitted to piezo elements 611 or possibly to a control unit 90 connected to drive shaft 2, in which the alternating voltages are output via switches to a package 61 of piezo elements 611.
  • the ultrasonic transducer 6 preferably comprises several piezo elements 611 connected to contact elements 613 (only two shown) and separated from one another by insulation elements.
  • the piezo elements 611 preferably each have a transfer opening through which the drive shaft 2 is guided.
  • the piezo elements 611 are pressed together by two locking elements 612 connected to the assembly rod 2, via which ultrasonic vibrations are transmitted to the drive shaft 2.
  • the locking elements 612 comprise, for example, at least one screw nut which is rotatably held by a thread which is machined into the drive shaft 2.
  • the piezo elements 611 can therefore be fixed in a simple manner and supplied with electrical voltages via the contact elements 613 in between.
  • the ultrasonic vibrations generated by the piezo elements 611 are transmitted to the drive shaft 2 and further to the compression screw 3 via the locking elements 612, which are integrally, non-positively or positively connected to the drive shaft 2.
  • a control unit 90 is integrated in the ultrasonic transducer 6 and is connected to the central control device 9. Control signals are transmitted via the cable 71 to the further sliding contacts 43, which are in contact with the further slip rings 44. The control signals are transmitted via control lines 73 to the control unit 90, which then controls the output of alternating voltages to the piezo elements 611 or the connection contacts 613.
  • the ultrasonic generator 7 can also be connected to the drive shaft 2.
  • the contacting device is used 4 or the contacts 41 and slip rings 42 transmit electrical energy, for example from the power supply unit 900, to the rotatably mounted ultrasonic generator 7, which can then output alternating voltages directly to the piezo elements 611.
  • the rotatably mounted ultrasonic generator 7 can be supplied with control signals from the central control unit 9 via the contacting device 4 or the contacts 43 and the slip rings 44.
  • the control signals can be transmitted to the rotatably mounted local control unit 90, which in turn controls the rotatably mounted ultrasonic generator 7.
  • the supply of ultrasonic energy to the compression screw 10 can therefore take place in different ways.
  • the ultrasonic energy is transmitted from the shaft 30 of the compression screw 3 to the thread 31, which is then subjected to ultrasonic vibrations of constant or changing frequency.
  • vibrations As a result of these vibrations, friction between the compression screw 3 and the processed process material is eliminated or significantly reduced.
  • Loads on the compression screw 3 and the drive motor 8 are correspondingly reduced, so that they have to be dimensioned less expensively and signs of wear can be reduced.
  • FIG. 13 shows the compression device 1 of FIG Fig. 1 in a preferred embodiment.
  • the compression pipe 10 connects to a funnel 15 which has an inlet 11 into which process material or bulk material S is thrown.
  • the walls of the funnel 15 and / or the compression pipe 10 are preferably also acted upon by ultrasound.
  • mechanical vibrations are preferably transmitted to the funnel 15, through which the process material is conveyed and dead zones in the funnel are avoided.
  • a vibration device 16 is provided which transmits mechanical vibrations to the wall of the funnel 15.
  • the process material is introduced into the compression pipe 10 by a compression screw 3 and is compressed there. It can be seen that the thread 31 of the compression screw 3 within the funnel 15 has a higher pitch than within the compression pipe 10.
  • the compression screw 3 transports the process material through the compression channel 100 within the hollow cylindrical compression pipe 10 to its outlet 12.
  • the drive shaft 2 is connected on one side in one piece with the shaft of the compression screw 3 and on the other side by a coupling 21 with the motor shaft of the drive motor 8.
  • the drive shaft 2 comprises the motor shaft.
  • the ultrasonic transducer 6 and in a preferred embodiment also the ultrasonic generator 7 are arranged, which alternatively can also be arranged externally, as this Fig. 2 shows.
  • rollers 18, 19 held by bearing shafts 180, 190 are provided, which are driven by motors 185, 195.
  • the rollers 18, 19 delimit a roller gap 17 into which the process material dispensed by the compression screw 10 can be introduced. In the nip 17, the process material is further compressed and, if necessary, cut to size.
  • the compressed or compacted process material is ejected in the form of pellets SP.
  • the rollers 18, 19 can be provided with knives that interlock and separate the compacted process material.
  • a cutting device or a milling device can also be provided following the roller gap 17.
  • ultrasonic energy is preferably transmitted to the outer surfaces of the rollers 18, 19.
  • alternating voltages in the ultrasonic range are transmitted from the ultrasonic generator 7 or another ultrasonic generator 7 'to ultrasonic transducers 6', which are arranged on the bearing shafts of the rollers 18, 19 or on the inner walls 181, 191 of the preferably hollow-cylindrical rollers 18, 19.
  • the additional ultrasonic transducers 6 ′ preferably have piezo elements which are adapted to the bearing shafts 180, 190 or to the inner sides 181, 191 of the rollers.
  • ring-shaped piezo elements are preferably used, which are placed on the bearing shafts 180, 190 in the manner that this with reference to FIG Fig. 1 has been described.
  • ultrasonic energy can only be impressed into the conveyor screw 3 or only into the rollers 18, 19.
  • ultrasonic energy is preferably impressed into the feed screw 3 and into the rollers 18, 19.
  • a compacting device 1 can thus also advantageously be implemented in which ultrasonic energy is fed exclusively to the rollers 18, 19.
  • a stationary ultrasonic generator 7 can be used or an additional one Ultrasonic generator 7 'can be provided and optionally integrated into the rollers 18, 19.
  • the stationary ultrasonic generator 7 can be used to feed ultrasonic transducers 6, 6 ′ that are assigned to the compression screw 10 and the rollers 18, 19.
  • the processes described are preferably again controlled by a control unit 9 and a control program 99.
  • the control unit 9 can directly access the drive motors 8, 185, 195 and the ultrasonic generators 7, 7 'in order to control them. Access to these units is symbolized by arrows.
  • the arrows pointing back towards the control unit 9 symbolize that measurement signals or sensor signals, which are preferably taken into account in the control program 99, can also be transmitted back to the control unit 9 from these units.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
EP19190117.2A 2019-08-05 2019-08-05 Dispositif de compression utilisant des vibrations ultrasoniques Withdrawn EP3772382A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19190117.2A EP3772382A1 (fr) 2019-08-05 2019-08-05 Dispositif de compression utilisant des vibrations ultrasoniques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19190117.2A EP3772382A1 (fr) 2019-08-05 2019-08-05 Dispositif de compression utilisant des vibrations ultrasoniques

Publications (1)

Publication Number Publication Date
EP3772382A1 true EP3772382A1 (fr) 2021-02-10

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EP19190117.2A Withdrawn EP3772382A1 (fr) 2019-08-05 2019-08-05 Dispositif de compression utilisant des vibrations ultrasoniques

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EP (1) EP3772382A1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991668A (en) 1974-12-27 1976-11-16 Sfm Corporation Shredder-compactor apparatus for processing refuse material
US5403455A (en) * 1987-03-31 1995-04-04 Candor; James T. Apparatus and method for removing liquid from liquid bearing material
US5664492A (en) 1993-06-10 1997-09-09 Bendzick; Ervin J. Apparatus for compacting metal shavings
US6186060B1 (en) 1998-12-01 2001-02-13 Robert W. Peterson Auger compactor for vegetation
US20090280211A1 (en) 2006-05-17 2009-11-12 Friedman Robert B Method of preparing a food product
WO2011065865A1 (fr) * 2009-11-26 2011-06-03 Общество С Ограниченной Ответственностью "Монолит" Procédé mise en oeuvre de réactions mécano-chimiques et réacteur
KR20120039179A (ko) * 2010-10-15 2012-04-25 이지혜 하우징의 조립 및 분리가 용이한 착즙기
WO2013139343A1 (fr) * 2012-03-19 2013-09-26 Purfil Aps Séparateur rotatif
WO2013159665A1 (fr) * 2012-04-25 2013-10-31 Wang Xiaodong Presse-fruits ayant une fonction d'extraction d'air
US20190168476A1 (en) * 2017-05-25 2019-06-06 Mun Hyun LEE Juicer having improved juicing performance

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991668A (en) 1974-12-27 1976-11-16 Sfm Corporation Shredder-compactor apparatus for processing refuse material
US5403455A (en) * 1987-03-31 1995-04-04 Candor; James T. Apparatus and method for removing liquid from liquid bearing material
US5664492A (en) 1993-06-10 1997-09-09 Bendzick; Ervin J. Apparatus for compacting metal shavings
US6186060B1 (en) 1998-12-01 2001-02-13 Robert W. Peterson Auger compactor for vegetation
US20090280211A1 (en) 2006-05-17 2009-11-12 Friedman Robert B Method of preparing a food product
WO2011065865A1 (fr) * 2009-11-26 2011-06-03 Общество С Ограниченной Ответственностью "Монолит" Procédé mise en oeuvre de réactions mécano-chimiques et réacteur
KR20120039179A (ko) * 2010-10-15 2012-04-25 이지혜 하우징의 조립 및 분리가 용이한 착즙기
WO2013139343A1 (fr) * 2012-03-19 2013-09-26 Purfil Aps Séparateur rotatif
WO2013159665A1 (fr) * 2012-04-25 2013-10-31 Wang Xiaodong Presse-fruits ayant une fonction d'extraction d'air
US20190168476A1 (en) * 2017-05-25 2019-06-06 Mun Hyun LEE Juicer having improved juicing performance

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