EP1203620A1 - Regelbare Vorrichtung mit Schwingsieb zum Verteilen von Pulver - Google Patents

Regelbare Vorrichtung mit Schwingsieb zum Verteilen von Pulver Download PDF

Info

Publication number
EP1203620A1
EP1203620A1 EP20010204169 EP01204169A EP1203620A1 EP 1203620 A1 EP1203620 A1 EP 1203620A1 EP 20010204169 EP20010204169 EP 20010204169 EP 01204169 A EP01204169 A EP 01204169A EP 1203620 A1 EP1203620 A1 EP 1203620A1
Authority
EP
European Patent Office
Prior art keywords
screen
metering device
transducer
transducers
powder
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Withdrawn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
EP20010204169
Other languages
English (en)
French (fr)
Inventor
Ernst Zysset
Friedrich Durand
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.)
Swatch Group Management Services AG
Original Assignee
Swatch Group Management Services AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Swatch Group Management Services AG filed Critical Swatch Group Management Services AG
Priority to EP20010204169 priority Critical patent/EP1203620A1/de
Publication of EP1203620A1 publication Critical patent/EP1203620A1/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/54—Large containers characterised by means facilitating filling or emptying
    • B65D88/64—Large containers characterised by means facilitating filling or emptying preventing bridge formation
    • B65D88/66—Large containers characterised by means facilitating filling or emptying preventing bridge formation using vibrating or knocking devices
    • B65D88/665—Large containers characterised by means facilitating filling or emptying preventing bridge formation using vibrating or knocking devices using a resonator, e.g. supersonic generator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B2230/00—Specific aspects relating to the whole B07B subclass
    • B07B2230/04—The screen or the screened materials being subjected to ultrasonic vibration

Definitions

  • the present invention belongs to the field of vibrating screen devices for the distribution of powders with an adjustable flow rate.
  • the device according to the invention includes in particular a servo means enabling the flow to be maintained at a predetermined value, regardless of the influences of the external environment, and if necessary to avoid clogging of the powder at the level of the sieve.
  • the document DE 4340948 describes a screening device designated by the reference 10 in Figures 1 and 2 of this description. Note that the figure 1 shows a bottom view of the screening apparatus 10, and that FIG. 2 shows a sectional view of this device along the axis II-II shown in Figure 1.
  • the screening apparatus 10 comprises a block (not shown in Figures 1 and 2) forming a reservoir which can contain a powder, a sieve 12 carried by a frame circular 13, and an annular vibrating resonator 11 bonded to the underside of the screen 12.
  • the resonator 11 comprises a flat aluminum ring, and an enlarged zone 14 for fixing a piezoelectric transducer 15 which resonates the resonator 11, so that the screen 12 begins to vibrate.
  • ultrasonic vibration of a sieve prevents the powder or granules from clog the sieve, so the powder or granules can flow through the sieve.
  • the piezoelectric transducer 15 is supplied by an alternating voltage sine wave having an amplitude of approximately 1000 V, an output power of approximately 20 W and a frequency between 18 and 42 kHz (ultrasonic range).
  • An apparatus makes it possible to obtain a powder having a particle size determined by the mesh of the sieve. It allows a flow of constant powder for a determined mesh size and by a frequency of sieve vibration determined. However, it does not allow perfect control of the nor avoid the formation of powder bridges above the screen. It does not allow no longer to modify the parameters of the metering sieve according to parameters outdoor, such as fluctuations in ambient temperature, degree hygrometric or atmospheric pressure which can influence the fluidity of the powder or on the operating conditions of the device itself.
  • It is an object of the present invention to provide a metering apparatus for sieve can overcome the aforementioned drawbacks, in particular an apparatus for dosing to regulate a powder flow with great stability and high reproducibility, and avoid, if necessary, the risk of clogging.
  • Another object of the present invention is to provide an apparatus allowing a powder dosage independent of variations in external conditions such as fluctuations in ambient temperature, humidity and pressure atmospheric.
  • the subject of the invention is a device for dosing powders comprising a feed hopper, a vibratory module formed by a sieve provided for a determined particle size of powder, and by a first transducer associated with a first resonator, said transducer receiving an alternating control voltage V com allowing it to transmit in response to mechanical vibrations to said screen, means for locking said vibratory module below said hopper and an electronic management unit arranged to supply said control voltage V com .
  • the apparatus is characterized in that it further comprises a second transducer arranged in the vicinity of said sieve or in mechanical connection with it and in that said management unit comprises a stage arranged to receive from said second transducer acting as a sensor a measurement voltage V mes representative of the mechanical vibrations of said sieve and for adjusting in response the control voltage V com of the first transducer so as to control the value of the powder flow rate to a predetermined set value.
  • the management unit electronics also includes a regulation stage intended to take account, by means of correspondence or calibration tables, for fluctuations in external conditions, for example temperature, humidity or pressure, as well as the device's own characteristics and those of the dose so as to maintain the powder flow independent of said parameters.
  • a regulation stage intended to take account, by means of correspondence or calibration tables, for fluctuations in external conditions, for example temperature, humidity or pressure, as well as the device's own characteristics and those of the dose so as to maintain the powder flow independent of said parameters.
  • the second transducer is also associated with a second resonator, and the two transducers have the same characteristics and work alternately to vibrate the sieve and to capture the vibrations of said sieve.
  • the vibration module also causes vibration a vibrating element projecting into the part median of the hopper.
  • Figure 3 shows a sectional view along an axial plane of a first embodiment of a metering device 1 according to the invention, of general shape cylindrical around an axis A, and having an outer casing in two parts.
  • the upper part 5 is formed by a tube 3, for example made of steel, welded on a brass base 4 of smaller internal diameter and having a thread at its base outside.
  • the lower part is formed by a brass ring 7, having at its part upper thread intended to cooperate with the thread of the upper part 4, and its base a ring 8 extending radially, a little beyond the internal wall of the brass base 4.
  • the ring 7 is provided with three ears 9 making it possible to facilitate its screwing / unscrewing on the base 4 of the upper part 5, so as to assemble the elements specific to the vibrating screen, as will be explained later.
  • the outer envelope maintains an assembly made up of four main elements, a module vibratory 20 disposed between a lower locking element 30 and a upper lock 40, also allowing positioning inside the tube 3 a hopper 39 which rests on a rim 6 of the base 4.
  • the vibration module 20 is formed of two piezoelectric assemblies, the operation of which is controlled by a electronic management 50 and which sandwich a sieve 26.
  • the piezoelectric assembly upper, hopper side 39 includes a metal resonator 21, a piezoelectric transducer 22 and a metal ring 23 also forming resonator and in contact with the screen 26.
  • the lower piezoelectric assembly, in contact with the screen 26 includes a piezoelectric transducer 24 and a metallic resonator 25.
  • the resonators 21, 25 and the ring 23, which provide also the control voltages to the transducers 22, 24 are connected to the electronic management 50 by connection flanges which pass through the element of upper lock 40.
  • the upper locking element 40 comprises on the side of the hopper 39 a bottom ring 44 having the same opening as the base of the hopper 39, and having a thick vertical wall 42 in which are provided on the one hand means mechanical assembly with the lower locking element 30, on the other hand means of electrical connection of the vibratory module 20 with a management unit electronics 50 which will be described later with reference to FIG. 7.
  • the mechanical assembly means consist of three passages through 18 intended to receive three threaded rods 28 to fix the means together upper locking 40 and lower 30, and two wells 16 whose bottom is drilled to allow the hopper 39 to be fixed using screws 37.
  • the electrical connection means consist of flanges of connections housed in wells 41, 43, 45, formed on the surface of the element of upper lock 40 in the thick wall 42.
  • These wells 41, 43, 45 have, according to axis A, passages which communicate with the central part intended to receive the vibratory module, depths corresponding to the staging of the resonators 21, 23, 25, and they have an angular offset relative to each other sufficient to that the walls of said wells do not communicate with each other.
  • each well is pierced with a hole 46 for the passage of a rod conductive 47 which opens to the outside at the base of the locking element upper, and which comprises, at the other end in a plane perpendicular to said rod 47, a loop 48, a portion 48a of which opens into the central recess for allow elastic contact with the resonators 21, 23, 25.
  • This flange of contact, formed by a rod 47 and a loop 48, is fixed to the bottom of each well at using a washer and a screw 49.
  • the lower locking element 30 fits into the locking element upper 40 by means of an upper ring 31, the upper bearing 34 of which substantially the same dimensions as the rings of the resonators and piezoelectric transducers. It then comprises a flange 32 provided with three holes 38 opposite the through passages 18 of the locking element upper 40, a lower sleeve 33 of smaller diameter than the upper ring 31, said sleeve 33 being extended by a tubular part 35.
  • this lower locking element 30 has in its center a tubular passage 36 of section substantially equal to the useful surface of the screen 26.
  • the elements of lower lock 30 and upper lock 40 are assembled by means of three rods threaded 28 which pass through the holes 38 of the flange 32, and the through passage 18 in the wall 42.
  • the heads of the threaded rods 28 are supported on a ring of lower blocking 29 having three holes for the passage of rods 28 whose ends are screwed into an upper locking ring 27 arranged in an annular recess 27a of the hopper 39. It will be observed that other means assembly are possible, for example by screwing the rods 28 directly in the thick wall 42 of the upper locking element 40.
  • the sieving-dosing device can further comprise a vibrating element 60 in the form of a rod.
  • this vibrating element 60 is constituted by a base 61 made of a material elastic in the form of an open loop which snaps into a groove 63 of the metal ring 23, said base 61 being extended by two flexible rods 62a, 62b bent at 90 ° and projecting inside the hopper 39.
  • the ring 23 enters into vibrations and transmits said vibrations to the rods 62a, 62b for allow the possible formation of arches or bridges on the surface of the powder.
  • the electrodes of the transducers 22 and 24, formed by the contacting surfaces of the resonators 21a and 25a, are connected electrically to the positive pole of the electronic management unit by means of at least a threaded rod 17 which passes through the resonators 21a and 25a and establishes a contact electric between them, also crossing the transducers 22 and 24 at the level which is provided with an insulating lining 17a.
  • the head of the rod 17 is in contact with a conductive ring 17b which allows the electrical connection to be brought back to the level of a second well 43b (not shown) near well 43a.
  • the lower resonator 25a is made of a metal having a specific density greater than that of the metal of the upper resonator 21a.
  • the resonator 25a we will use for example a steel and for the resonator 21a aluminum or an alloy aluminum.
  • FIG. 5 also shows a variant in which the flexible rod has from place to place radial extensions 64a, 64b, 64c ... etc. which help to break the vaults and bridges even more easily, what whether the level of powder in the hopper 39. It is obvious that this mode of embodiment and this variant are also applicable in the case where the screen 26 is pinched between two resonators 21, 25.
  • the mechanical deformations imposed by the axial vibration of the piezoelectric transducers 22 and 24 are absorbed and / or restored by the elastic deformations of the connecting rods 17 or 28.
  • FIG. 6 shows an alternative embodiment of the sieve of FIG. 5, wherein said screen 26 'has a curved shape which gives the screen a better mechanical strength and stabilizes deformations and which reduces the risk of clogging.
  • the top of the curved screen includes a 26 "vibration sensor which can also be connected to the electronic management unit 50 for the control piezoelectric transducers 22 and 24. Obviously such a form of sieve is also compatible with the embodiment corresponding to Figures 3 and 4.
  • the piezoelectric transducers which are preferably identical to facilitate the calibration of the electronic management unit 50, and to increase the accuracy of the metering device, have not been differentiated as to their respective functions.
  • one transducer acts as a vibrator and the other transducer as a vibration sensor.
  • the two transducers 22 and 24 have an alternating loop operation.
  • a transducer for example the transducer 22, receives a train of pulses controlled by an alternating voltage V com delivered by the electronic management unit 50 to vibrate the screen 26 or 26 'along the axis A.
  • the other transducer 24 acts as a vibration sensor and delivers a measurement voltage V ' mes to the electronic management unit 50, which will adjust back if necessary the voltage V' com for the following period.
  • the operations of the transducers 22 and 24 are reversed and correspond to the voltages V ′ com . and V mes .
  • the alternation of the voltages V com and V ′ com is shown diagrammatically in FIG. 8a.
  • FIG. 7 represents the block diagram of the electronic management control unit 50, it can be seen that there are different stages making it possible to take into account the characteristics of the device, those of its operation. , as well as the external conditions for obtaining, as a function of time t, a powder flow rate D determined for example by the diagram designated by the reference 59 in FIG. 7.
  • the data of this diagram are integrated in a first regulation stage 51 which comprises also a module 52 making it possible to act on the characteristics specific to the apparatus, for example when replacing a screen 26 or 26 ′ with a new screen, by a screen having a different mesh opening or when using a new powder with different characteristics.
  • stage 55 also includes a module 53 which allows, by means of correspondence or calibration tables 53 T , 53 H , 53 P deriving from the values received from sensors of temperature T, of hygrometric degree H and of pressure P of the environment in which the device operates, to deliver a control signal 54 to the next stage 55.
  • the stage 55 also receives from each transducer 22, 24 a measurement voltage V mes , V ' mes to deliver control signals in return 56a, 56b on the next stage 57.
  • the force sensor 26 is located on the screen itself (see FIG. 6) it will be observed that stage 55 can receive only one measurement voltage V mes , delivered only by said 26 "sensor.
  • Stage 57 comprises two power stages 57a and 57b respectively receiving the control signals 56a, 56b and a supply voltage Vo to deliver respectively to each sensor 22, 24 a control voltage V com , V ' com according to an alternation which was explained at the beginning in relation to the timing diagram of FIG. 8a.
  • Such an electronic management unit 50 has the advantage of being able to control the powder flow to a predetermined flow value from vibrations mechanical elements supplied to the sieve, i.e. in fact the control voltage and the measurement voltage which are adjusted and adjustable at a frequency equal to the resonant frequency of all the vibrating elements of the device.
  • This electronic management unit 50 also makes it possible to minimize, see totally eliminate flow variations due to changes in conditions factors such as temperature, humidity and pressure atmospheric or artificially applied pressure in the tank.
  • the electronic management unit 50 can contain a time programming of the control voltages, so as to have for example vibration trains having an ascending ramp during a time t up , then a plateau for a time t on and finally a downward ramp for a time t off , the voltages V com and V ' com having their positive and negative alternations in opposition.
  • the present invention has essentially been described with reference to piezoelectric transducers. It is obvious that other types of transducers can be used without departing from the scope of the present invention, such as electromagnetic transducers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combined Means For Separation Of Solids (AREA)
EP20010204169 2000-11-06 2001-10-30 Regelbare Vorrichtung mit Schwingsieb zum Verteilen von Pulver Withdrawn EP1203620A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20010204169 EP1203620A1 (de) 2000-11-06 2001-10-30 Regelbare Vorrichtung mit Schwingsieb zum Verteilen von Pulver

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
EP00203877 2000-11-06
EP00203879 2000-11-06
EP00203877 2000-11-06
EP00203879 2000-11-06
EP20010204169 EP1203620A1 (de) 2000-11-06 2001-10-30 Regelbare Vorrichtung mit Schwingsieb zum Verteilen von Pulver

Publications (1)

Publication Number Publication Date
EP1203620A1 true EP1203620A1 (de) 2002-05-08

Family

ID=27223447

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20010204169 Withdrawn EP1203620A1 (de) 2000-11-06 2001-10-30 Regelbare Vorrichtung mit Schwingsieb zum Verteilen von Pulver

Country Status (1)

Country Link
EP (1) EP1203620A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105366225A (zh) * 2015-12-03 2016-03-02 湖南三一路面机械有限公司 破拱装置及料仓
CN108754493A (zh) * 2018-08-17 2018-11-06 福建工程学院 一种用于激光熔覆的可实现粉末梯度变化的送粉装置
CN113522713A (zh) * 2021-07-21 2021-10-22 温州市凯安建设有限公司 一种沥青混凝土冷料环保上料机构

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE931218C (de) * 1953-07-03 1955-08-04 Carl Haver & Ed Boecker Vibrierender Siloverschluss
FR2408865A1 (fr) * 1977-11-10 1979-06-08 Mac Lean Reuben Equipement permettant de faire vibrer un corps
US4346802A (en) * 1977-11-17 1982-08-31 Popper Engineering Ltd. Combination anti-bridging device and vibrating tray
DE4340948A1 (de) * 1993-12-01 1995-06-08 Matthias Dipl Ing Coppers Siebvorrichtung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE931218C (de) * 1953-07-03 1955-08-04 Carl Haver & Ed Boecker Vibrierender Siloverschluss
FR2408865A1 (fr) * 1977-11-10 1979-06-08 Mac Lean Reuben Equipement permettant de faire vibrer un corps
US4346802A (en) * 1977-11-17 1982-08-31 Popper Engineering Ltd. Combination anti-bridging device and vibrating tray
DE4340948A1 (de) * 1993-12-01 1995-06-08 Matthias Dipl Ing Coppers Siebvorrichtung

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105366225A (zh) * 2015-12-03 2016-03-02 湖南三一路面机械有限公司 破拱装置及料仓
CN108754493A (zh) * 2018-08-17 2018-11-06 福建工程学院 一种用于激光熔覆的可实现粉末梯度变化的送粉装置
CN108754493B (zh) * 2018-08-17 2023-06-20 福建工程学院 一种用于激光熔覆的可实现粉末梯度变化的送粉装置
CN113522713A (zh) * 2021-07-21 2021-10-22 温州市凯安建设有限公司 一种沥青混凝土冷料环保上料机构
CN113522713B (zh) * 2021-07-21 2022-01-18 温州市凯安建设有限公司 一种沥青混凝土冷料环保上料机构

Similar Documents

Publication Publication Date Title
FR2531533A1 (fr) Capteur piezo-electrique de pression et/ou de temperature
CA1174871A (fr) Thermometre a quartz
EP0067790A1 (de) Gemischter elektro-akustischer Wandler
BE898619A (fr) Procede pour la determination des accelerations
FR2570838A1 (fr) Appareil d'examen de milieux par echographie ultrasonore avec focalisation angulaire
FR2556164A1 (fr) Haut-parleur
FR2834056A1 (fr) Connexion electrique pour gyroscope a resonateur hemispherique
FR2487502A1 (fr) Tete de mesure pour le controle des dimensions lineaires de pieces mecaniques
US20020060230A1 (en) Vibrating sureening device for distributing powder with adjustable flow rate
EP1203620A1 (de) Regelbare Vorrichtung mit Schwingsieb zum Verteilen von Pulver
WO2004066041A1 (fr) Appareil portable etanche avec transducteur electroacoustique
FR2741151A1 (fr) Gyrometre a resonateur mecanique
FR2789170A1 (fr) Gyroscope vibrant
EP0476482A1 (de) Sensor für eine physische Grösse
CH714635A1 (fr) Pièce d'horlogerie à sonnerie.
FR2572519A1 (fr) Detecteur de niveau a transducteur electro-mecanique
EP0142410A1 (de) Verfahren und Vorrichtung zur Heizungsregelung für ein thermostatisiertes Gehäuse eines Oszillators, insbesondere eines Quartzoszillators
EP0561677B1 (de) Resonatur für einen temperaturkompensierten Oszillator mit geringem Energieverbrauch und schneller Aufwärmzeit
EP0437397B1 (de) Differenzbeschleunigungsmesser mit piezoelektrischen Schwingelementen
FR2682050A1 (fr) Dispositif de tamisage equipe de moyens de decolmatage.
FR2510336A1 (fr) Transducteur piezoelectrique
EP0118329A2 (de) Geschwindigkeitshydrophon
CH709833B1 (fr) Mouvement horloger à régulateur à résonance tridimensionnelle.
EP1019201B1 (de) Hilfsvorrichtung zum sieben und reinigen mit einer mit ultraschall schwingenden struktur und eine mit einer solchen vorrichtung versehene siebanlage
EP0042644B1 (de) Vorrichtung zur Rattenbekämpfung in Gebäuden oder im Gelände mittels Schwingungen

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 20021007