WO1990015767A1 - Device for dosing powdered bulk materials - Google Patents
Device for dosing powdered bulk materials Download PDFInfo
- Publication number
- WO1990015767A1 WO1990015767A1 PCT/EP1990/000952 EP9000952W WO9015767A1 WO 1990015767 A1 WO1990015767 A1 WO 1990015767A1 EP 9000952 W EP9000952 W EP 9000952W WO 9015767 A1 WO9015767 A1 WO 9015767A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- scraper
- circumferential groove
- metering
- dosing
- recess
- 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
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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 powdery bulk material, in particular for use in plastics processing machines, with a motor-driven housing that is open in its casing on the inlet side upwards and on the outlet side downwards .rung arranged around a horizontal axis, on its circumference at least one radially open metering metering roller u ⁇ with a stripper engaging on the outlet side in the metering recess.
- Metering devices of this type are known, the metering rollers of which are designed as cell wheels, on the circumference of which a plurality of metering recesses (cells) arranged at equal distances from one another and closed on their circumference are provided.
- the emptying of the cells is supported there by a scraper which is inserted from the outside into the outlet-side channel of the metering device.
- the known metering device works with free-flowing, granular bulk material with sufficient metering accuracy. Powdery, poorly pourable substances that tend to cake can only be metered inaccurately with it, because the closed cells of the cellular wheel absorb strongly varying amounts of powder and transfer them into the discharge channel.
- the invention is therefore based on the object of to improve the known metering device of the type mentioned at the outset so that it can also be used to meter powdery, poorly pourable solids with high accuracy.
- the invention is based on the empirical knowledge that the partitions between the individual cells of the known cell wheels form a kind of shading during the filling process, which disturb the filling process especially with poorly pourable substances.
- the metering recess is designed as a coherent circumferential groove without intermediate walls.
- the circumferential groove has a wave-shaped, preferably sinusoidal shape over the circumference, with deflections in the axial direction while the groove depth remains the same.
- the scraper is expediently pivoted so that it can follow the shaft movement of the circumferential groove that arises when the metering roller rotates.
- the discharge of the bulk material is facilitated by a cross section of the circumferential groove that widens radially outward.
- the scraper preferably engages radially from below into the circumferential groove and is mounted in an oscillating manner about a swivel axis.
- the surface of which the bulk material acts includes an angle that is open obliquely downwards with the vertical, the falling out of the bulk material is facilitated below.
- the scraper advantageously has a scraper tongue adapted to the cross-sectional shape of the circumferential groove.
- the scraper can for example on a laßkanal engaging in the Aus ⁇ , dissolvable, in a Gerissausewan *: are preferably mounted between two annular shoulders be ⁇ solidified cylindrical bolt. In order to make it easier to replace the cylinder bolt and the scraper, one of the ring shoulders can be formed by a spacer sleeve loosely pushed onto the cylinder bolt. As an alternative to this, the scraper can be rigidly connected to a cylinder bolt which engages in the outlet channel and which is mounted in an oscillating manner in a cylinder bore of a housing wall, so that the bulk material falling on the cylinder bolt is thrown off when it rotates.
- the metering roller expediently has, on its circumferential surface, preferably rectangular in cross-section, starting from the end edges of the peripheral surface against the direction of rotation and pointing inwardly into the peripheral groove and conveying grooves through which the ring gap between the metering roller and the Any recessed powder that has entered the housing is conveyed back to the circumferential groove.
- the housing cutout can be closed on the outlet side by a shut-off slide arranged below the scraper.
- a scraper plate arranged in the area of the inlet-side jacket opening, with a scraper edge parallel to the axis of the metering roller and extending into the immediate vicinity of the metering roller, closes the annular gap in the direction of rotation between the circumference of the metering roller and the cylindrical inner surface of the housing outer Saving on the inlet side and prevents the powdery bulk material from becoming stuck in the annular gap and thus leading to a blocking of the metering roller.
- the distance between the scraper ante and the circumference of the metering roller is expediently adjustable.
- Baking of pulverulent bulk material on the scraper can be prevented by at least one compressed air outlet nozzle, which in the area of the scraper opens into the outlet-side jacket opening and is directed towards the surface of the scraper acted upon by the bulk material.
- FIG. 1 shows a partial vertical section through a metering device for powder metering.
- FIG. 2 shows a plan view of the circumference of the metering roller according to FIG. 1 with a pendulum scraper; 3 shows a vertical section through a further exemplary embodiment of a powder metering device;
- Fig. 4 shows a section through the metering roller
- the dosing device shown in the drawing is primarily intended for dosing poorly pourable, powdery bulk material, for example colored powders in plastics processing.
- the metering device consists of a housing 10 and a metering roller 18 which is arranged in a substantially cylindrical housing recess 12 and is motor-driven about a horizontal axis 14 in the direction of the arrow 16.
- the metering roller 18 is connected from above with a a hopper 19 equipped hopper 21, a feed chute 20 leading from the hopper 21 to the housing recess 12 and an inlet opening 22 with the bulk material stored in a container 23 and can be connected downwards via an outlet opening 24 to an output channel 26 for the metered bulk material.
- the housing 10, together with the container 23 placed on the housing is detachably plugged onto a pin 25 of a holding device 27.
- the inlet opening 22 and the outlet opening 24 are separated from one another by closed conveying paths 28, 30 which run within the housing recess 12.
- the material is transported in a wave-like, preferably sinusoidal shape along the circumference of the metering roller running transport or circumferential groove 32, which is continuously filled with bulk material in the area of the feed chute 20 and is continuously emptied from the bulk material on the side of the discharge channel 26 by a scraper 34 engaging in the transport groove 32.
- the scraper 34 shown in FIG. 1 is mounted on a bolt 38, which is screwed into a threaded bore of the housing wall 36, so that it oscillates about the horizontally oriented axis 38 'of the bolt 38, so that it swings the movement of the traction groove 32 back and forth in the axial direction of the metering roller can participate.
- the stripper 34 which is preferably designed as a stamped sheet metal part, is mounted on the bolt 38 between a bolt-fixed ring shoulder 40 and the end face of a loosely pushed-on spacer ring 42, so that it can be replaced relatively easily by loosening the bolt 38.
- the stripper 34 shown in FIG. 3 is mounted on a cylinder bolt 38 which is inclined relative to the horizontal.
- the inclination of the pin axis 38 'on the one hand makes it more difficult for bulk material to accumulate on the upward circumferential surface of the cylinder bolt 38, and on the other hand the space formed between the housing wall 36 and the surface of the scraper 34 acted upon by the bulk material widens downwards, as a result of which Blockages can be prevented.
- the scraper 3.4 weJLat which is pivoted about a pivot axis 38 '. a stripper 44 engaging radially into the transport groove 32 with its free end.
- the profile course of the transport groove 32 and the outline of the free end of the scraper tongue which plunges into the transport groove are matched to one another such that the transport groove 32 is completely cleared out in each pendulum position of the scraper 34.
- the inclination of the groove base is in each case at the apex of the curve, i.e. greatest in the area of the maximum pendulum deflection of the scraper and decreases in each case towards the turning points of the curve.
- the filling shaft 20 of the dosing device which is open towards the funnel 21 on the one hand and towards the inlet opening 22 on the other hand, has two opposite side walls 72 which diverging downwards and two end walls 74, 76 which converge obliquely towards the inlet opening 22 .
- a scraper plate 60 is arranged on the end wall 74, the scraper edge 54 of which extends into the immediate vicinity of the circumference of the metering roller 18 and the annular gap 56 closed on the entry side.
- the scraper plate 60 fastened to the housing 10 with the holding screw is adjustable in the direction of the metering roller 18 so that it can be readjusted when worn.
- rectangular conveying grooves 64 are worked into the circumferential surface of the metering roller 18, which, starting from the front edges 62 of the circumferential surface, proceed obliquely inwards against the direction of rotation (arrow 16) on the circumferential surface ver ⁇ run and open into the Transport ⁇ ut 32. With the aid of the conveying grooves 64, the bulk material that has penetrated into the annular gap 56 is returned to the transport groove.
- a gate valve 52 is horizontally displaceably mounted on the housing 10, which automatically closes the discharge channel 26 when the housing 10 is removed from the holding device 27 and thus prevents bulk material from falling out of the housing.
- a cylinder pin 51 formed on the gate valve 52 engages in a clamping spring 53, so that the gate valve 52 is held in its open position.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
Description
Dosiervorrichtung für pulverförmiges Schüttgut Dosing device for powdery bulk material
Beschreibungdescription
Die Erfindung betrifft eine Vorrichtung zum Dosieren von pulverförmigem Schüttgut, insbesondere für den Ein¬ satz in Kunststoffverarbeitungs aschiπen , mit einer mo¬ torisch angetriebenen, in einer an ihrem Mantel ein- trittsseitig nach oben und austrittsseitig nach unten offenen Ge.hau.aaaus_.s__pa.rung um eine horizontale Achse drehbar angeordneten, an ihrem Umfang mindestens eine radial offene Dosierausnenmung aufweisenden Dosierrolle uπα mit einem austrittsseitig in die Dosierausnehmung eingreifenden Abstreifer.The invention relates to a device for dosing powdery bulk material, in particular for use in plastics processing machines, with a motor-driven housing that is open in its casing on the inlet side upwards and on the outlet side downwards .rung arranged around a horizontal axis, on its circumference at least one radially open metering metering roller uπα with a stripper engaging on the outlet side in the metering recess.
Es sind Dosiervorrichtungen dieser Art bekannt, deren Dosierrollen als Zellenräder ausgebildet sind, an deren Umfang eine Mehrzahl von in gleichen Abständen vonein¬ ander angeordneten und an ihrem Umfang geschlossenen Dosierausnehmungen (Zellen) vorgesehen sind. Das Ent¬ leeren der Zellen wird dort durch einen Auskratzer un¬ terstützt, der von außen in den austrittsseitigen Kanal der Dosiervorricircung eingesetzt ist. Die bekannte Do¬ siervorrichtung arbeitet zwar mit gut rieselfähigem, körnigem Schüttgut mit hinreichender Dosiergenauigkeit. Pulverför ige , schlecht rieselfähige Stoffe, die zum Zusammenbacken neigen, lassen sich mit ihr jedoch nur ungenau dosieren, weil die geschlossenen Zellen des Zelleπrades stark variierende Pulvermengen aufnehmen und in den Austragkanal überführen.Metering devices of this type are known, the metering rollers of which are designed as cell wheels, on the circumference of which a plurality of metering recesses (cells) arranged at equal distances from one another and closed on their circumference are provided. The emptying of the cells is supported there by a scraper which is inserted from the outside into the outlet-side channel of the metering device. The known metering device works with free-flowing, granular bulk material with sufficient metering accuracy. Powdery, poorly pourable substances that tend to cake can only be metered inaccurately with it, because the closed cells of the cellular wheel absorb strongly varying amounts of powder and transfer them into the discharge channel.
Der Erfindung liegt daher die Aufgabe zugrunde, die be- kannte Dosiervorrichtung der eingangs angegebenen Art dahingehend zu verbessern, daß mit ihr auch pulverför- ige, schlecht rieselfähige Feststoffe mit hoher Ge¬ nauigkeit dosiert werden können.The invention is therefore based on the object of to improve the known metering device of the type mentioned at the outset so that it can also be used to meter powdery, poorly pourable solids with high accuracy.
Zur Lösung dieser Aufgabe werden die im Kennzeichenteil des Anspruchs 1 angegebenen Merkmale vorgeschlagen. Weitere vorteilhafte Ausgestaltungen und Weiterbj -dtιn- gen der Erfindung ergeben sich aus den abhängigen An¬ sprüchen.To achieve this object, the features specified in the characterizing part of claim 1 are proposed. Further advantageous refinements and developments of the invention result from the dependent claims.
Die Erfindung geht von der empirischen Erkenntnis aus, daß die Zwischenwände zwischen den einzelnen Zellen der bekannten Zellenräder beim Füllvorgaπg eine Art Ab¬ schattung bilden, die vor allem bei schlecht rieselfä¬ higen Stoffen den Füllvorgang stören. Um diesen Nach¬ teil zu vermeiden, wird gemäß der Erfindung vorgeschla¬ gen, daß die Dosierausnehmung als zusammenhängende Um¬ fangsnut ohne Zwischenwände ausgebildet ist.The invention is based on the empirical knowledge that the partitions between the individual cells of the known cell wheels form a kind of shading during the filling process, which disturb the filling process especially with poorly pourable substances. In order to avoid this disadvantage, it is proposed according to the invention that the metering recess is designed as a coherent circumferential groove without intermediate walls.
Gemäß einer bevorzugten Ausgestaltung der Erfindung weist die Umfangsnut einen über den Umfang wellenförmi¬ gen, vorzugweise sinusförmigen Verlauf auf, und zwar mit Ausleπkungen in axialer Richtung bei gleichbleiben¬ der Nutentiefe. Mit dieser Maßnahme wird wegen der wechselnden Flankenrichtung ein guter Transporteffekt auch bei weniger oder nicht zusammenbackendem Schüttgut erzielt. Der Abstreifer ist dabei zweckmäßig pendelnd gelagert, so daß er der bei drehender Dosierrolle ent¬ stehenden Wellenbewegung der Umfangsnut folgen kann. Das Austragen des Schüttguts wird durch einen sich radial nach außen erweiternden Querschnitt der Umfangsnut er¬ leichtert. Gemäß einer vorteilhaften Ausgestaltung der Erfindung greift der Abstreifer vorzugsweise radial von unten her in die Umfangsnut ein und ist um eine Schwenk¬ achse pendelnd gelagert. Bei einem Abstreifer, dessen vom Schüttgut beaufschlagte Fläche einen schräg nach unten offenen Winkel mit der Senkrechten einschließt, wird das Herausfallen des Schüttguts nacn unten erleich¬ tert. Vorteilhafterweise weist der Abstreifer eine an die Querschnittsform der Umfangsnut angepaßte Abstreifzunge auf.According to a preferred embodiment of the invention, the circumferential groove has a wave-shaped, preferably sinusoidal shape over the circumference, with deflections in the axial direction while the groove depth remains the same. With this measure, due to the changing flank direction, a good transport effect is achieved even with less or not caking bulk material. The scraper is expediently pivoted so that it can follow the shaft movement of the circumferential groove that arises when the metering roller rotates. The discharge of the bulk material is facilitated by a cross section of the circumferential groove that widens radially outward. According to an advantageous embodiment of the invention, the scraper preferably engages radially from below into the circumferential groove and is mounted in an oscillating manner about a swivel axis. In the case of a scraper, the surface of which the bulk material acts includes an angle that is open obliquely downwards with the vertical, the falling out of the bulk material is facilitated below. The scraper advantageously has a scraper tongue adapted to the cross-sectional shape of the circumferential groove.
Der Abstreifer kann beispielsweise an einem in den Aus¬ laßkanal eingreifenden, lösbar in einer Gehäusewan*,: be¬ festigten Zylinderbolzen, vorzugsweise zwischen zwei Ringschultern gelagert werden. Um das Auswechseln des Zylinderbolzeπs und des Abstreifers zu erleichtern, kann eine der Riπgschultern durch eine auf den Zylinderbolzen lose aufgeschobene Distaπzhülse gebildet sein. Alternativ dazu kann der Abstreifer starr mit einem in den Ausla߬ kanal eingreifenden, in einer Zylinderbohrung einer Ge- häusewaπd pendelnd gelagerten Zylinderbolzen verbunden sein, so daß das auf den Zylinderbolzen fallende Schütt¬ gut bei dessen Drehbewegung abgeworfen wird. Um bei vorgegebener Drehzahl der Dosierrolle unterschied¬ liche Dosierraten einstellen zu können, werden gemäß der Erfindung mehrere, gegeneinander austauschbare Dosier¬ rollen bereitgehalten, deren Umfangsnuten unterschiedliche Querschnittsformeπ oder- abmessungen aufweisen. Zweck¬ mäßig sind in diesem Falle auch mehrere gegeneinander austauschbare, in ihren Abmessungen an die unterschied¬ lichen Urafangsnutenquers.chni.t-te a.ngep_aJite Ah.qtrejfer vorgesehen, damit auch bei schlecht rieselfähigem, zu¬ sammenbackendem Schüttgut die Umfangsnut vollständig ausgeräumt werden kann. Bei pendelnd gelagerten Abstrei- ferπ muß zum vollständigen Ausräumen der Umfangsnut deren Profilverlauf in den von der Wellenform der Umfangsnut abhängigen Pendellagen des Abstreifers dem Umriß des in die Umfangsnut eintauchenden Abstreiferendes entsprechen.The scraper can for example on a laßkanal engaging in the Aus¬, dissolvable, in a Gehäusewan *: are preferably mounted between two annular shoulders be¬ solidified cylindrical bolt. In order to make it easier to replace the cylinder bolt and the scraper, one of the ring shoulders can be formed by a spacer sleeve loosely pushed onto the cylinder bolt. As an alternative to this, the scraper can be rigidly connected to a cylinder bolt which engages in the outlet channel and which is mounted in an oscillating manner in a cylinder bore of a housing wall, so that the bulk material falling on the cylinder bolt is thrown off when it rotates. In order to be able to set different metering rates at a given speed of the metering roller, according to the invention several metering rollers which are interchangeable are kept ready, the circumferential grooves of which have different cross-sectional shapes or dimensions. In this case, it is also expedient to provide a plurality of interchangeable, dimensionally different Urafangsnutenquers.chni.t-te a.ngep_aJite Ah.qtrejfer, so that the circumferential groove is completely cleared out even with poorly pourable, caking bulk goods can. In the case of pendulum-mounted wipers, in order to completely clear the circumferential groove, its profile profile in the pendulum positions of the wiper depending on the wave shape of the circumferential groove must correspond to the outline of the wiper end immersed in the circumferential groove.
Die Dosierrolle weist zweckmäßig an ihrer U fangsfläche im Querschnitt vorzugsweise rechteckige, von den stirn¬ seitigen Rändern der Umfangsfläche ausgehend entgegen der Drehrichtung schräg nach innen weisende und in die Umfangsnut mündende Fördernuten auf, durch welche even¬ tuell in den Ringspalt zwischen der Dosierrolle und der Gehäuseaussparung eingetretenes pulverförmiges Fördergut zur Umfangsnut zurückgefördert wird.The metering roller expediently has, on its circumferential surface, preferably rectangular in cross-section, starting from the end edges of the peripheral surface against the direction of rotation and pointing inwardly into the peripheral groove and conveying grooves through which the ring gap between the metering roller and the Any recessed powder that has entered the housing is conveyed back to the circumferential groove.
Um bei demontierter Dosiervorrichtung ein Herausfallen von Schüttgut zu verhindern ist die Gehäuseaussparung austrittseitig durch einen unterhalb des Abstreifers angeordneten Absperrschieber verschließbar. Eine im Bereich der eintrittseitigen Mantelöffnung ange¬ ordnete, mit einer zur Achse der Dosierrolle parallelen Abstreifkante bis in die unmittelbare N he des U faπgs der Dosierrolle reichende Abstreifplatte verschließt in Drehrichtuπg den Ringspalt zwischen dem Umfang der Dosier¬ rolle und der zylindrischen Innenfläche der Gehäuseaus¬ sparung eintrittsseitig und verhindert daß sich das pulver* förmige Schüttgut im Ringspalt verklam t und damit z_υ einem Blockieren der Dosierrolle führt. Der Abstand zwischen der Abstreif ante und dem Umfang der Dosierrolle ist zweckmäßig einstellbar.In order to prevent bulk goods from falling out when the metering device is removed, the housing cutout can be closed on the outlet side by a shut-off slide arranged below the scraper. A scraper plate arranged in the area of the inlet-side jacket opening, with a scraper edge parallel to the axis of the metering roller and extending into the immediate vicinity of the metering roller, closes the annular gap in the direction of rotation between the circumference of the metering roller and the cylindrical inner surface of the housing outer Saving on the inlet side and prevents the powdery bulk material from becoming stuck in the annular gap and thus leading to a blocking of the metering roller. The distance between the scraper ante and the circumference of the metering roller is expediently adjustable.
Ein Anbacken von pulverförmigem Schuttgut am Abstreifer kann durch mindestens eine im Bereich des Abstreifers in die austrittseitige Mantelöffnuπg mündende, auf die vom Schüttgut beaufschlagte Fläche des Abstreifers ge¬ richtete Druckluftaustrittsdüse verhindert werden.Baking of pulverulent bulk material on the scraper can be prevented by at least one compressed air outlet nozzle, which in the area of the scraper opens into the outlet-side jacket opening and is directed towards the surface of the scraper acted upon by the bulk material.
Im folgenden wird die Erfindung anhand zweier in der Zeichnung in schematischer Weise dargestellter Ausfüh¬ rungsbeispiele näher erläutert. Es zeigenThe invention is explained in more detail below with reference to two exemplary embodiments shown schematically in the drawing. Show it
Fig. 1 einen ausschnittsweisen Vertikalschnitt durch eine Dosiervorrichtung für die Pulverdosierung;1 shows a partial vertical section through a metering device for powder metering.
Fig. 2 eine Draufsicht auf den Umfang der Dosierrolle nach Fig. 1 mit Pendelabstreifer ; Fig. 3 einen Vertikalschnitt durch ein weiteres Aus¬ führungsbeispiel einer Pulverdosiervorrichtuπg;FIG. 2 shows a plan view of the circumference of the metering roller according to FIG. 1 with a pendulum scraper; 3 shows a vertical section through a further exemplary embodiment of a powder metering device;
Fig. 4 einen Schnitt durch die Dosierrolle und denFig. 4 shows a section through the metering roller and
Abstreifer entlang der Linie A-A der Figur 3.Scraper along line A-A of Figure 3.
Die in der Zeichnung dargestellte Dosiervorrichtung ist vor allere zum Dosieren von schlecht riesβlfähige pulver¬ förmigem Schüttgut, beispielsweise von Farbpulvern bei der KunststoffVerarbeitung, bestimmt. Die Dosiervorrich¬ tung besteht aus einem Gehäuse 10 und einer in einer im wesentlichen zylindrischen Geh useausnehmung 12 angeord¬ neten, um eine horizontale Achse 14 in Richtung des Pfeils 16 motorisch angetriebenen Dosierrolle 18. Die Dosier¬ rolle 18 ist von oben her über einen mit einem Rückwerk 19 bestückten Trichter 21, einen vom Trichter 21 zur Gehauseausnehmung 12 führenden Einfüllschacht 20 und eine Eintrittsöffnung 22 mit dem in einem Behälter 23 gespeicherten Schüttgut beschickbar und steht nach unten hin über eine Austrittsöffπung 24 mit einem Ausgabekanal 26 für das dosierte Schüttgut in Verbindung. Das Gehäuse 10 ist zusammen mit dem auf das Gehäuse aufgesetzten Behälter 23 lösbar auf eine Merkkaπtstange 25 einer Halte¬ vorrichtung 27 aufgesteckt. Die Eintrittsöffnung 22 und die Austrittsöffπung 24 sind durch geschlossene Förderstrecken 28,30, die innerhalb der Gehauseausnehmung 12 verlaufen, voneinander getrennt.The dosing device shown in the drawing is primarily intended for dosing poorly pourable, powdery bulk material, for example colored powders in plastics processing. The metering device consists of a housing 10 and a metering roller 18 which is arranged in a substantially cylindrical housing recess 12 and is motor-driven about a horizontal axis 14 in the direction of the arrow 16. The metering roller 18 is connected from above with a a hopper 19 equipped hopper 21, a feed chute 20 leading from the hopper 21 to the housing recess 12 and an inlet opening 22 with the bulk material stored in a container 23 and can be connected downwards via an outlet opening 24 to an output channel 26 for the metered bulk material. The housing 10, together with the container 23 placed on the housing, is detachably plugged onto a pin 25 of a holding device 27. The inlet opening 22 and the outlet opening 24 are separated from one another by closed conveying paths 28, 30 which run within the housing recess 12.
Den Materialtransport übernimmt eine entlang dem Umfang der Dosierrolle wellenförmig, vorzugsweise sinusförmig verlaufende Transport- bzw. Umfangsnut 32, die im Bereich des Einfüllschachtes 20 laufend mit Schüttgut gefüllt und auf der Seite des Ausgabekaπals 26 durch einen in die Transportnut 32 eingreifenden Abstreifer 34 von dem Schüttgut fortlaufend entleert wird.The material is transported in a wave-like, preferably sinusoidal shape along the circumference of the metering roller running transport or circumferential groove 32, which is continuously filled with bulk material in the area of the feed chute 20 and is continuously emptied from the bulk material on the side of the discharge channel 26 by a scraper 34 engaging in the transport groove 32.
Der in Fig. 1 dargestellte Abstreifer 34 ist an einem in eine Gewindebohruπg der Gehäusewand 36 eingedrehten Bolzen 38 um die horizontal ausgerichtete Achse 38' des Bolzens 38 pendelnd gelagert, so daß er die in axialer Richtung der Dosierrolle hin- und herschwingende Bewegung der Traπsportnut 32 mitmachen kann. Der vorzugsweise als Blechstanzteil ausgebildete Abstreifer 34 ist auf dem Bolzen 38 zwischen einer bolzenfesten Ringschulter 40 und der Stirnfläche eines lose aufgeschobenen Distanz¬ rings 42 gelagert, so daß er durch Lösen des Bolzens 38 relativ einfach ausgewechselt werden kann.The scraper 34 shown in FIG. 1 is mounted on a bolt 38, which is screwed into a threaded bore of the housing wall 36, so that it oscillates about the horizontally oriented axis 38 'of the bolt 38, so that it swings the movement of the traction groove 32 back and forth in the axial direction of the metering roller can participate. The stripper 34, which is preferably designed as a stamped sheet metal part, is mounted on the bolt 38 between a bolt-fixed ring shoulder 40 and the end face of a loosely pushed-on spacer ring 42, so that it can be replaced relatively easily by loosening the bolt 38.
Der in Fig. 3 gezeigte Abstreifer 34 ist an einem gegen¬ über der Horizontalen geneigten Zylinderbolzen 38 pen¬ delnd gelagert. Durch die Neigung der Bolzenachse 38' wird zum einen das Ansammeln von Schüttgut auf der nach oben gerichteten Umfangsfläche des Zyliπderbolzens 38 erschwert, zum anderen erweitert sich der zwischen der Gehäusewand 36 und der vom Schüttgut beaufschlagten Fläche des Abstreifers 34 gebildete Raum nach unten hin, wodurch Verstopfungen verhindert werden. Mit Hilfe einer oberhalb des Abstreifers in den Austrittskanal 26 mündenden, auf die vom Schüttgut beaufschlagte Fläche des Abstreifers 34 gerichteten Druckluftaustrittsdüse 70 können Schüttgut- anbackungen am Abstreifer verhindert oder beseitigt werden.The stripper 34 shown in FIG. 3 is mounted on a cylinder bolt 38 which is inclined relative to the horizontal. The inclination of the pin axis 38 'on the one hand makes it more difficult for bulk material to accumulate on the upward circumferential surface of the cylinder bolt 38, and on the other hand the space formed between the housing wall 36 and the surface of the scraper 34 acted upon by the bulk material widens downwards, as a result of which Blockages can be prevented. With the help of an above of the scraper opening into the outlet channel 26 and directed towards the surface of the scraper 34 which is acted upon by the bulk material 34 can prevent or eliminate caking of bulk material on the scraper.
Der um eine Schwenkachse 38' pendelnd gelagerte Abstreifer 3.4 weJLat. eine mit hrem freien Ende radial in die Trans¬ portnut 32 eingreifende Abstreifzuπge 44 auf. Der Profil¬ verlauf der Transportnut 32 und der Umriß des in die Traπsportnut eintauchenden freien Endes der Abstreifzunge sind einander so angepaßt, daß die Transportnut 32 in jeder Pendellage des Abstreifers 34 vollständig ausge¬ räumt wird. Bei dem dargestellten wellen- oder sinus¬ förmigen Kurvenverlauf der Transportnut 32 führt dies zu einer im Verlauf variablen Neigung des Nutengrundes und der Nuteπflaπken gegenüber der Drehachse 14. Die Neigung des Nuteπgrundes ist dabei jeweils in den Scheitel¬ punkten der Kurve, d.h. im Bereich der maximalen Pendel¬ auslenkung des Abstreifers am größten und nimmt jeweils zu den Wendepunkten der Kurve hin ab.The scraper 3.4 weJLat, which is pivoted about a pivot axis 38 '. a stripper 44 engaging radially into the transport groove 32 with its free end. The profile course of the transport groove 32 and the outline of the free end of the scraper tongue which plunges into the transport groove are matched to one another such that the transport groove 32 is completely cleared out in each pendulum position of the scraper 34. In the illustrated wave-shaped or sinusoidal curve profile of the transport groove 32, this leads to a variable inclination of the groove base and the groove flanks with respect to the axis of rotation 14. The inclination of the groove base is in each case at the apex of the curve, i.e. greatest in the area of the maximum pendulum deflection of the scraper and decreases in each case towards the turning points of the curve.
Der zum Trichter 21 hin einerseits und zur Eintrittsöff¬ nung 22 hin andererseits offene, in das Gehäuse 10 ein¬ geformte Einfüllschacht 20 der Dαsiervorrichtung weist zwei einander gegenüberliegende, nach unten divergierende Seitenwände 72 sowie zwei schräg zur Eintrittsöffnung 22 hin konvergierende Stirnseitenwände 74, 76 auf. Um zu verhindertn, daß Schüttgut in den Ringspalt 56 zwischen der Dosierrolle 14 und der Gehäuseaussparung 12 eintritt, ist an der Stirnseitenwand 74 eine Abstreif¬ platte 60 angeordnet, deren Abstreifkante 54 bis in die unmittelbare Nähe des Umfaπgs der Dosierrolle 18 reicht und den Ringspalt 56 eiπtrittseitig verschließt. Die mit Halteschraubeπ am Gehäuse 10 befestigte Abstreif¬ platte 60 ist in Richtung der Dosierrolle 18 verstellbar, so daß sie bei Verschleiß nachgestellt werden kann. Da eine vollständige Abdichtung des Riπgspalts 56 in diesem Bereich nicht möglich ist, sind in der Umfangsfläche der Dosierrolle 18 im Querschnitt rechteckige Förderπuten 64 eingearbeitet, die von den stirnseitigen Rändern 62 der Umfangsfläche ausgehend entgegen der Drehrichtung (Pfeil 16) auf der Umfangsfläche schräg nach innen ver¬ laufen und in die Transportπut 32 münden. Mit Hilfe der Fördernuten 64 wird das in den Ringspalt 56 eingedrungene Schüttgut zur Transportnut zurückgeführt.The filling shaft 20 of the dosing device, which is open towards the funnel 21 on the one hand and towards the inlet opening 22 on the other hand, has two opposite side walls 72 which diverging downwards and two end walls 74, 76 which converge obliquely towards the inlet opening 22 . In order to prevent bulk material from entering the annular gap 56 between the metering roller 14 and the housing recess 12, a scraper plate 60 is arranged on the end wall 74, the scraper edge 54 of which extends into the immediate vicinity of the circumference of the metering roller 18 and the annular gap 56 closed on the entry side. The scraper plate 60 fastened to the housing 10 with the holding screw is adjustable in the direction of the metering roller 18 so that it can be readjusted when worn. Since a complete sealing of the ring gap 56 is not possible in this area, rectangular conveying grooves 64 are worked into the circumferential surface of the metering roller 18, which, starting from the front edges 62 of the circumferential surface, proceed obliquely inwards against the direction of rotation (arrow 16) on the circumferential surface ver¬ run and open into the Transportπut 32. With the aid of the conveying grooves 64, the bulk material that has penetrated into the annular gap 56 is returned to the transport groove.
Unterhalb des Abstreifers 34 ist ein Absperrschieber 52 am Gehäuse 10 horizontal verschiebbar gelagert, der den Ausgabekanal 26 beim Abnehmen des Gehäuses 10 von der Haltevorrichtung 27 selbsttätig schließt und so ein Her¬ ausfallen von Schüttgut aus dem Gehäuse verhindert. Beim Aufschieben des Gehäuses 10 rastet ein am Absperrschieber 52 angeformter Zyliπderstift 51 in einer Klemmfeder 53 ein, so daß der Absperrschieber 52 in seiner Offeπstellung gehalten wird. Below the scraper 34, a gate valve 52 is horizontally displaceably mounted on the housing 10, which automatically closes the discharge channel 26 when the housing 10 is removed from the holding device 27 and thus prevents bulk material from falling out of the housing. When the housing 10 is pushed on, a cylinder pin 51 formed on the gate valve 52 engages in a clamping spring 53, so that the gate valve 52 is held in its open position.
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3919389.6 | 1989-06-14 | ||
| DE3919389 | 1989-06-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1990015767A1 true WO1990015767A1 (en) | 1990-12-27 |
Family
ID=6382713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP1990/000952 Ceased WO1990015767A1 (en) | 1989-06-14 | 1990-06-15 | Device for dosing powdered bulk materials |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU5930290A (en) |
| DE (1) | DE4019018C2 (en) |
| WO (1) | WO1990015767A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114985040A (en) * | 2022-02-28 | 2022-09-02 | 南昌泰康食品科技有限公司 | Multifunctional stirring and crushing device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19752532C2 (en) * | 1996-12-13 | 1999-10-21 | Fraunhofer Ges Forschung | Device for discharging a powdery or granular substance |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3486484A (en) * | 1965-09-23 | 1969-12-30 | British Iron Steel Research | Formation of coatings |
| GB1202766A (en) * | 1968-07-23 | 1970-08-19 | Golden Wonder Ltd | Apparatus for distributing powder |
| GB1402429A (en) * | 1972-06-13 | 1975-08-06 | British Titan Ltd | Feeding solid material |
| DE3203887A1 (en) * | 1981-02-09 | 1982-10-14 | Rogers Corp., 06263 Rogers, Conn. | Foam-covered feed roll |
| EP0112398A1 (en) * | 1982-12-20 | 1984-07-04 | Bayer Ag | Measuring device |
-
1990
- 1990-06-14 DE DE4019018A patent/DE4019018C2/en not_active Expired - Fee Related
- 1990-06-15 AU AU59302/90A patent/AU5930290A/en not_active Abandoned
- 1990-06-15 WO PCT/EP1990/000952 patent/WO1990015767A1/en not_active Ceased
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3486484A (en) * | 1965-09-23 | 1969-12-30 | British Iron Steel Research | Formation of coatings |
| GB1202766A (en) * | 1968-07-23 | 1970-08-19 | Golden Wonder Ltd | Apparatus for distributing powder |
| GB1402429A (en) * | 1972-06-13 | 1975-08-06 | British Titan Ltd | Feeding solid material |
| DE3203887A1 (en) * | 1981-02-09 | 1982-10-14 | Rogers Corp., 06263 Rogers, Conn. | Foam-covered feed roll |
| EP0112398A1 (en) * | 1982-12-20 | 1984-07-04 | Bayer Ag | Measuring device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114985040A (en) * | 2022-02-28 | 2022-09-02 | 南昌泰康食品科技有限公司 | Multifunctional stirring and crushing device |
| CN114985040B (en) * | 2022-02-28 | 2023-10-27 | 南昌泰康食品科技有限公司 | Multifunctional stirring and crushing device |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4019018C2 (en) | 2000-08-17 |
| DE4019018A1 (en) | 1990-12-20 |
| AU5930290A (en) | 1991-01-08 |
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