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WO1990015768A1 - Dispositif de dosage pour materiaux pulverulents ou granules en vrac - Google Patents

Dispositif de dosage pour materiaux pulverulents ou granules en vrac Download PDF

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Publication number
WO1990015768A1
WO1990015768A1 PCT/EP1990/000953 EP9000953W WO9015768A1 WO 1990015768 A1 WO1990015768 A1 WO 1990015768A1 EP 9000953 W EP9000953 W EP 9000953W WO 9015768 A1 WO9015768 A1 WO 9015768A1
Authority
WO
WIPO (PCT)
Prior art keywords
metering roller
housing
metering
opening
rotation
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.)
Ceased
Application number
PCT/EP1990/000953
Other languages
German (de)
English (en)
Inventor
Günter Doll
Original Assignee
Spido Technik Gmbh Entwicklung
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 Spido Technik Gmbh Entwicklung filed Critical Spido Technik Gmbh Entwicklung
Publication of WO1990015768A1 publication Critical patent/WO1990015768A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G65/00—Loading or unloading
    • B65G65/30—Methods or devices for filling or emptying bunkers, hoppers, tanks, or like containers, of interest apart from their use in particular chemical or physical processes or their application in particular machines, e.g. not covered by a single other subclass
    • B65G65/34—Emptying devices
    • B65G65/40—Devices for emptying otherwise than from the top
    • B65G65/48—Devices for emptying otherwise than from the top using other rotating means, e.g. rotating pressure sluices in pneumatic systems
    • B65G65/4881—Devices for emptying otherwise than from the top using other rotating means, e.g. rotating pressure sluices in pneumatic systems rotating about a substantially horizontal axis

Definitions

  • the invention relates to a device for dosing granular or powdery bulk material, in particular for use in plastic processing machines, in a manner that is open on its jacket upwards and on the outlet side downwards Housing recess rotatably arranged about a horizontal axis, having at least one radially open dosing recess and having a dosing shaft which is arranged on the inlet side and can be loaded with bulk material via a funnel equipped with an agitator.
  • Dosing devices of this type are used, for example, for dosing granular or powdery dyestuffs and plastic granules before further processing in extrusion machines, injection molding machines or blow molding machines.
  • a metering device of this type is known (DE-PS 2857740), in which close guidance of the metering roller in the housing block is proposed in order to achieve high metering accuracy.
  • the narrower the guide gaps the greater the risk that the bulk material particles entering the gaps will jam the metering roller and thereby cause operational failures. Proceeding from this, the invention is based on the object of improving the known metering device of the type mentioned at the outset in such a way that clamping of the metering roller during metering operation is largely avoided and nevertheless a high metering accuracy can be achieved.
  • the solution according to the invention is based on the knowledge that a narrowing of the gap width and an extension of the gap length in the sealing against the undesired access of bulk material into the gap area between the metering roller and metering roller housing are tight due to the increasing frictional forces and the increasing risk of the metering roller becoming jammed There are limits.
  • the metering accuracy on the other hand, depends primarily on the gap width on the immersion side of the metering roller, while in the further course of the metering roller rotation the gap width is less critical for the metering accuracy.
  • a cutting wedge extends over the width of the jacket opening or its scraper edge in the immediate right near the metering roller circumference and in the direction opposite to the direction of rotation knife plate or scraper plate is arranged.
  • the knife plate according to the invention has a wiping function (to increase the metering accuracy) and a cutting function compared to bulk material particles (to prevent the metering roller from jamming).
  • the cutting function of the knife insert is used primarily in the case of granular bulk material, such as plastic granulate, while the scraping function is particularly important in the case of powdery bulk material. Since different internals are necessary along the metering section when conveying granular and powdery bulk material, it is proposed according to a preferred embodiment of the invention that the direction of rotation of the metering roller can be optionally adjusted depending on the consistency of the material to be conveyed. Accordingly, the knife plate for the granular bulk material and the scraper for the powdery bulk material can be arranged in the region of mutually opposite boundary edges of the jacket opening on the inlet side.
  • the cylindrical housing recess has a larger diameter than the metering roller, while the cutting wedge of the knife plate and / or the scraper edge of the scraper limit the radial annular gap thereby formed towards the inlet-side jacket opening.
  • the knife plate and / or the scraper forms at least a part of the boundary surface of the filling shaft which is at the rear in the direction of rotation of the metering roller.
  • the knife plate or the scraper are expediently arranged in a recess in the housing wall which corresponds to their dimensions and is open to the inside of the shaft and can be fastened there by means of clamping screws.
  • the distance between the cutting wedge and / or the scraper edge on the one hand and the metering roller circumference on the other hand should be less than 0.2 mm, preferably less than 0.05 mm. If the bulk material contains coarse-grained particles that are difficult to break down, it is fundamentally also possible, in order to avoid jamming, to arrange the knife plate against the force of a spring so as to be displaceable to a limited extent in the housing wall, increasing its distance from the cellular wheel.
  • the cutting wedge of the knife plate has a free surface which is essentially matched to the surface curvature of the cellular wheel. An improved shearing and cutting effect is achieved if the cutting wedge has a wedge angle that is more acute than the angle of attack of the associated boundary surface of the shaft.
  • the metering roller has metering chambers which are edged at an angle to the metering roller axis and which, instead of a straight cut, permit an oblique cut on the bulk material particles projecting beyond the chamber rim.
  • a V or U-shaped metering chamber is particularly advantageous. edge, the open ends of the V or U shape should point in the direction of rotation of the metering roller.
  • the metering roller has, on its outer surface, preferably V-shaped, opposite to the direction of rotation obliquely facing from the outer edge inward conveying grooves, which ensure that in the end gap area between The bulk material and the bulk material are conveyed back axially inward into the metering recess and are prevented from escaping into the axial space. This measure also counteracts jamming of the cellular wheel.
  • the metering recess for powdery bulk material is advantageously designed as a coherent, wavy, in particular sinusoidal circumferential groove, in which a pendulum-suspended scraper engages on the outlet side.
  • the metering roller is rotatably mounted on both sides in bearings fixed to the housing.
  • the metering roller with a central bore can be rotatably attached to an output shaft of a geared motor arranged on the housing or on a housing cover and engaging in the housing recess.
  • the Metering roller with a shaft which can be inserted into the central bore on the side opposite the output shaft in a rotary bearing of a housing cover clamped in an axial opening of the recess or flanged to its opening edge.
  • the rotary bearing designed as a ball bearing is expediently covered by a bearing cap which projects outwards and is preferably designed as a handle provided with a pull-off handle.
  • the metering roller can be rotatably mounted on two housing covers which are detachably fastened to the housing, preferably in ball bearings, the geared motor being rigidly connected to one of the two housing covers.
  • the housing cover or covers can be releasably clamped in the housing recess with an eccentric screw or connected to the housing by means of captive screws.
  • the hopper be detachably attached to the knife plate and / or the filler shaft carrying the scraper is fastened and has an opening which leads to the filler shaft and which is closed by a preferably conical gate valve which is adapted in shape to the bottom of the hopper.
  • outlet-side opening of the housing recess can preferably be closed automatically by a gate valve.
  • FIG. 1 shows a vertical section through a metering device with an axially cut metering roller
  • FIG. 2 shows a vertical section through a metering device with a radially cut metering roller
  • 3a to 3d a plan view of the peripheral surface of a metering roller with differently bordered Dosierhunt ⁇ ;
  • FIGS. 1 and 2 shows a vertical section through a metering device modified with respect to FIGS. 1 and 2 with an axially cut metering roller;
  • FIG. 5a shows a vertical section through the metering device according to FIG. 4 with a radially cut metering roller for powdery bulk material
  • FIG. 5b shows a detail from the metering device according to FIG. 5a with a metering roller for granular bulk material
  • FIG. 6 shows a plan view of the dosing device according to FIG. 4;
  • FIG. 7 shows a plan view of the conical shut-off valve of the filling funnel of the metering device according to FIG. 4;
  • FIG. 8 shows a section through a metering roller with a pendulum wiper.
  • the dosing devices shown in the drawing are intended for dosing granular and powdery bulk material, for example colored granules or powder in plastics processing.
  • the dosing devices essentially consist of a housing 10 made of plastic, a dosing roller 14 arranged in a substantially cylindrical recess 12 of the housing, a feed shaft 16 arranged on the inlet side above the dosing roller 14, which also has a funnel 20 equipped with an agitator 18 Bulk material can be loaded, and an outlet channel 22 pointing downward on the outlet side for the metered bulk material.
  • the housing jacket containing the cylindrical recess 12 is interrupted to form an inlet opening 24 and an outlet opening 26, respectively.
  • a preferably DC-driven geared motor 30 is flanged by means of screws 32 on the housing wall 28 (FIG. 1) axially delimiting the cylindrical recess 12 or FIG. 4.
  • the output shaft 34 of the geared motor 30 engages in the cylindrical recess 12 through a bore 36 in the housing wall 28 or the housing cover 28 '.
  • the metering roller 14 is inserted through a wall opening 38 into the cylindrical recess 12 and is thereby pushed onto the output shaft 34 with a central bore 40.
  • a disc spring 42 which is semicircular in outline, is inserted into a recess in the circumference of the output shaft 24 and engages in a driving groove 44 of the metering roller 14 which is open towards the central bore 40.
  • the metering roller 14 has a pin 46 penetrated by the central bore 40 and the roller 44, which in the assembled state engages either with play in the bore 36 of the housing wall 28 (FIG. 1) or on the one in the housing cover 28 '. arranged Kugella ⁇ ger 52 'is plugged (Fig. 4).
  • the cylindrical wall opening 38 is closed by a housing cover 48 and clamped at the opening edge with an eccentric screw 50 (FIG.
  • a ball bearing 52 is pressed into the housing cover 48, the inner ring of which either carries an axially projecting cylindrical pin 54 which can be inserted into the central bore 40 during assembly (FIG. 1) or is pushed onto a pin 51 of the metering roller 14 (FIG. 4).
  • the metering roller is thus rotatably mounted both on the motor side (on the output shaft 34 mounted in the motor housing or in the ball bearing 52 ') and on the side of the housing cover 48 (in the ball bearing 52).
  • the ball bearing 52 is covered on the outside by a bearing cover 58 designed as a handle and provided with a withdrawal thread 56.
  • FIG. 1 the ball bearing 52 is covered on the outside by a bearing cover 58 designed as a handle and provided with a withdrawal thread 56.
  • the handle 58 ' is directly molded on the housing cover 48.
  • captive screws 50 and 60 are arranged, which for this purpose can be screwed into corresponding screw holes in the adjacent metering roller 14.
  • the pin 51 of the cellular wheel has a gripping groove 53 for this purpose.
  • the filler shaft 16 which is open towards the funnel 20 on the one hand and towards the inlet opening 24, on the other hand, is molded into the housing block 10 and has two side walls 62 which diverge slightly obliquely towards the bottom and two end side walls 64, 66 which converge obliquely towards the inlet opening 24.
  • a knife plate 72 is located in the end wall 66 in a recess 70 which is open towards the shaft and which is aligned in the wall plane 66 and extends with its cutting wedge 74 into the immediate vicinity of the circumference of the metering roller.
  • the free surface 76 of the cutting wedge 74 has a curvature which is essentially matched to the curvature of the metering roller.
  • the knife plate which extends over the entire width of the end wall 66 is fastened to the adjacent housing wall by means of two clamping screws 78.
  • the cutting wedge 74 is offset on its rake face 80 by a step with respect to the rest of the knife insert and thereby has a wedge angle that is more acute than the angle of attack of the wall 66.
  • the knife plate 72 once has the function of a scraper which engages at the immersion point 82 of the metering roller 14 in the annular gap 84 between the metering roller 14 and the cylindrical recess 12 and limits the passage gap there to approximately 0.05 mm.
  • the knife plate 72 has a cutting radio tio ⁇ in such a way that any bulk material particles protruding beyond the edge of the metering chambers 86, which could become jammed in the narrow gap between the cutting wedge 74 and the outer surface of the metering roller 14, are sheared off.
  • the shear effect is improved if the upper border 88 of the metering chamber 86 does not run axially parallel at both ends, as shown in FIG. 3b, but rather at an angle, as shown in FIGS. 3a, 3c and 3fiispia-JLba.jE.tL 3d is shown.
  • 3c and 3d should be arranged on the metering roller such that their open side points in the direction of rotation of the metering roller. 3c and 3d also have the advantage that the bulk material particles separated by the cutting wedge are moved towards the center during the cutting process and are thus prevented from penetrating into the free edge area.
  • a cylindrical step which is part of the cylindrical recess 12, adjoins the side walls 62 of the filling shaft 16 in the region of the inlet opening 24. Since a complete seal against undesired penetration of bulk material is not possible in this area, conveying grooves 92 are incorporated in the outer surface of the metering roller 14, which run obliquely from the outside inwards against the direction of rotation and any outwards into the edge area Convey 90 bulk particles inwards again into the area of the metering chambers 86. This effectively prevents jamming in the end region of the rim.
  • the loosening is mainly caused by the guide surfaces 96, which are arranged on the agitator blades 98 of the agitator 18 in such a way that they reach under the bulk material and lift it upwards.
  • air nozzles 100, 102 which either open directly through the housing wall into the filling shaft 16 (100) or are arranged on the agitator shaft under the agitator blades 98 (102).
  • the air nozzles are pressurized with compressed air via a diaphragm pump 104 and lead to a loosening of the bulk material in the area of the filling chute and thus to a uniform filling of the metering chambers 86.
  • the funnel 20 is detachably attached to the housing 10 by means of quick-release fasteners 112 on the side. It also has a conical gate valve 114 which is rotatably arranged in the area of the funnel bottom around the funnel axis, so that, depending on the rotational position of the funnel 20, the opening 116 leading to the filling shaft 16 can be opened or closed. In the closed state, the funnel together with the storage container 110 can be removed from the housing and replaced without loss of material and pollution of the environment. Furthermore, in the exemplary embodiment shown in FIGS. 4 to 7, on the side of the feed chute 16 opposite the knife plate 72, an inlet-side scraper 118 is arranged, which enables metering roller operation in both directions of rotation.
  • the metering roller is rotated counterclockwise in the case of FIG. 5a, while a rotation in a clockwise direction is provided beneath the knife plate 72 when conveying granular bulk material (FIG. 5b).
  • special metering rollers are used, which have a metering recess 86 'designed as a wave-shaped circumferential circumferential groove, into which, on the outlet side, the scraper which is oscillating on the pin 122 engages obliquely from below.
  • the outlet channel 22 is laterally delimited by a transparent plate 124, which enables a visual observation of the metering process.
  • the outlet channel 22 is further on its underside by a gate valve
  • the gate valve has a downward driving pin 127 with which it can be snapped into a clamping spring 130 fixed to the frame. In this way, the gate valve 166 is when the housing 10 is plugged onto the multi-channel guide 128 via the driver pin striking against the clamping spring 130
  • Gate valve 126 is initially closed by means of the driver pin 127 held in the clamping spring 130, before the driver pin disengages from the clamping spring 130. In this way, the housing can be removed from the multi-channel guide 128 without loss of material and contamination of the surroundings.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)

Abstract

Un dispositif de dosage de matériaux pulvérulents ou granulés en vrac, notamment pour machines de traitement de matières plastiques, comprend une roue (14) à alvéoles entraînée par un moteur, agencée de manière rotative autour d'un axe horizontal dans un évidement (12) du logement dont l'enveloppe est ouverte en haut du côté admission et ouverte en bas du côté sortie, la roue étant pourvue de chambres de dosage (86) radialement ouvertes. Du côté admission du sas de la roue à alvéoles est agencé un puits de remplissage (16) susceptible de recevoir les matériaux en vrac contenus dans un réservoir situé plus haut à travers un entonnoir d'alimentation pourvu d'un mécanisme agitateur (18). Afin d'éviter des blocages de la roue à alvéoles dus à la pénétration de particules du matériau en vrac dans les espaces entre la roue et la paroi du logement, un bloc de lames (72) est agencé dans la zone du bord postérieur (82) de délimitation de l'orifice d'admission (24), vue dans le sens de rotation de la roue à alvéoles (14). Le bloc de lames (72) s'étend sur toute la largeur de l'orifice d'admission (24) et ses lames en forme de coin (74) s'étendent jusqu'à proximité immédiate de la circonférence de la roue à alvéoles et sont orientées en sens opposé au sens de rotation de la roue à alvéoles.
PCT/EP1990/000953 1989-06-14 1990-06-15 Dispositif de dosage pour materiaux pulverulents ou granules en vrac Ceased WO1990015768A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3919388 1989-06-14
DEP3919388.8 1989-06-14

Publications (1)

Publication Number Publication Date
WO1990015768A1 true WO1990015768A1 (fr) 1990-12-27

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PCT/EP1990/000953 Ceased WO1990015768A1 (fr) 1989-06-14 1990-06-15 Dispositif de dosage pour materiaux pulverulents ou granules en vrac

Country Status (2)

Country Link
AU (1) AU5930190A (fr)
WO (1) WO1990015768A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2259910A (en) * 1991-09-21 1993-03-31 Clarke Stephen William Dispensing device
WO2010056325A1 (fr) * 2008-11-14 2010-05-20 Global Oled Technology Llc Dosage de matière particulaire et vaporisation de celle-ci
JP2012508816A (ja) * 2008-11-14 2012-04-12 グローバル・オーエルイーディー・テクノロジー・リミテッド・ライアビリティ・カンパニー 粒子材料の計量及び気化
JP2012508817A (ja) * 2008-11-14 2012-04-12 グローバル・オーエルイーディー・テクノロジー・リミテッド・ライアビリティ・カンパニー 粒子材料の計量及び気化
WO2017175213A1 (fr) 2016-04-03 2017-10-12 Treitel Chemical Engineering Ltd. Appareil et procédé de dosage de matière en poudre ou granulaire
WO2025163348A1 (fr) * 2024-02-01 2025-08-07 F.Lli Sacchi Di Sacchi Angelo E C. S.N.C. Appareil de dosage pour matériaux en poudre, en granulés ou en paillettes

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR491573A (fr) * 1917-10-25 1919-06-07 Gordon Shakespear Layton Perfectionnements apportés aux déchargeurs à roues à augets
DE2412660A1 (de) * 1973-03-30 1974-10-17 Herriau Cambrai Sa Zuteiler fuer pulver- oder kornfoermiges gut
US4231495A (en) * 1978-02-23 1980-11-04 Rader Companies, Inc. Rotary feeder for pneumatic conveying line
US4529107A (en) * 1983-03-11 1985-07-16 Morine Richard L Dispensing apparatus with reciprocating blade
EP0225775A2 (fr) * 1985-12-05 1987-06-16 Westinghouse Brake And Signal Holdings Limited Dispositif à vanne rotative
DE2857740C2 (de) * 1978-02-14 1989-04-06 Werner 7536 Ispringen Koch Dosiergerät zum Zudosieren von Festen Stoffen in den Vorrats- oder Mischtrichter von Kunststoffverarbeitungsmaschinen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR491573A (fr) * 1917-10-25 1919-06-07 Gordon Shakespear Layton Perfectionnements apportés aux déchargeurs à roues à augets
DE2412660A1 (de) * 1973-03-30 1974-10-17 Herriau Cambrai Sa Zuteiler fuer pulver- oder kornfoermiges gut
DE2857740C2 (de) * 1978-02-14 1989-04-06 Werner 7536 Ispringen Koch Dosiergerät zum Zudosieren von Festen Stoffen in den Vorrats- oder Mischtrichter von Kunststoffverarbeitungsmaschinen
US4231495A (en) * 1978-02-23 1980-11-04 Rader Companies, Inc. Rotary feeder for pneumatic conveying line
US4529107A (en) * 1983-03-11 1985-07-16 Morine Richard L Dispensing apparatus with reciprocating blade
EP0225775A2 (fr) * 1985-12-05 1987-06-16 Westinghouse Brake And Signal Holdings Limited Dispositif à vanne rotative

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2259910A (en) * 1991-09-21 1993-03-31 Clarke Stephen William Dispensing device
GB2259910B (en) * 1991-09-21 1995-10-25 Clarke Stephen William Dispensing device
WO2010056325A1 (fr) * 2008-11-14 2010-05-20 Global Oled Technology Llc Dosage de matière particulaire et vaporisation de celle-ci
US7972443B2 (en) 2008-11-14 2011-07-05 Global Oled Technology Llc Metering of particulate material and vaporization thereof
JP2012508816A (ja) * 2008-11-14 2012-04-12 グローバル・オーエルイーディー・テクノロジー・リミテッド・ライアビリティ・カンパニー 粒子材料の計量及び気化
JP2012508818A (ja) * 2008-11-14 2012-04-12 グローバル・オーエルイーディー・テクノロジー・リミテッド・ライアビリティ・カンパニー 粒子材料の計量及びその気化
JP2012508817A (ja) * 2008-11-14 2012-04-12 グローバル・オーエルイーディー・テクノロジー・リミテッド・ライアビリティ・カンパニー 粒子材料の計量及び気化
CN102282289B (zh) * 2008-11-14 2013-01-09 全球Oled科技有限责任公司 粒料的计量和蒸发
WO2017175213A1 (fr) 2016-04-03 2017-10-12 Treitel Chemical Engineering Ltd. Appareil et procédé de dosage de matière en poudre ou granulaire
US11274953B2 (en) 2016-04-03 2022-03-15 Treitel Chemical Engineering Ltd. Apparatus and method for dosaging powdered or granulated material
US11624642B2 (en) 2016-04-03 2023-04-11 Treitel Chemical Engineering Ltd. Apparatus and method for dosaging powdered or granulated material
WO2025163348A1 (fr) * 2024-02-01 2025-08-07 F.Lli Sacchi Di Sacchi Angelo E C. S.N.C. Appareil de dosage pour matériaux en poudre, en granulés ou en paillettes

Also Published As

Publication number Publication date
AU5930190A (en) 1991-01-08

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