EP1140669B1 - Dosing device for bulk goods - Google Patents

Description

The invention relates to a metering device for bulk materials according to the preamble of claim 1.

There are already dosing for the removal of bulk materials a silo-like container known in which by linearly movable Slider the outlet end can be opened and closed. difficulties Depending on the type of bulk material, this can be caused by this for caking or sticking to the container walls, and This prevents regular outflow through bridging. It turns out that with increasing size of the outlet opening the problem the irregular Nachfliessen the bulk material on the one hand though decreases, but on the other hand is due to the linear sliding movement lateral gap opening unfavorable, if only small quantities needed become.

In the rational filling of bulk materials in containers, bags od. Like. should in the shortest possible time a large flow rate for coarse dosing be issued. With a fine dosing or taring on exact weight should then once or several times small quantities of bulk material be refilled or removed. This creates the problem that on the one hand a large flow opening and on the other hand a small flow opening should be available. With conventional Slider closures can not be satisfying this requirement solve, since unfavorable flow behavior of the bulk material, the weight of the Material column above the lateral small gap opening of the conical Funnel wall is supported or sticks to this, so at only small dosing an increased tendency for bridging exists. This danger is also known from DE-A-2 256 147, inside the bulk hopper rotatably arranged stripping and loosening organ not to eliminate.

From the generic JP-A 60065961 is a closure training in the form of two pivotable spherical cap halves known. With such trained closure organs succeed at full Swiveling into the opening position a large flow opening to get for the bulk. In addition, you can also choose small ones Flow openings in the central fall area, ie vertically, above the vertical Material column, produce. However, there is also the metering device according to JP-A-60065961, in particular with only a small amount of dosing, i.e. with only a small opening of the spherical cap halves, a risk that the bulk material will not drain sufficiently, especially if it is difficult to flow bulk materials.

With the invention, the problem to be solved, a metering device to create the type mentioned, they are both dosed Output of small quantities of bulk material is suitable as well as large quantities of bulk material can spend in a short time, but in any Oeffnungszustand the occlusive organs also at bridging tendency Bulk material ensures trouble-free flow of the bulk material.

This object is achieved by a metering device with the features of claim 1 solved.

Due to the fact that in a metering device with as Kugelkalotten halves formed around an axis of rotation located above the outlet end pivotally held closure members inside the bulk goods container a stripping and loosening member is rotatably arranged, which with its lowest part to the area of the lowest, central Outlet opening of the spherical cap halves extends, is difficult to flow Bulk goods of a bridge formation down to the lowest area of the bulk material container - ie up to the spherical caps - reliably counteracts and the flow of the bulk material ensured, even if only a small flow opening is released.

The formation of the closure in the form of two relative to each other Pivoting spherical dome halves unlike the Slider closures a more compact design. This allows a space-saving Installation of a large number of bulk containers next to each other.

By forming the metering device with a bottom of a Main body attached bearing ring and an intermediate rotary ring with drive ring can be a few parts requiring, especially achieve compact design, which also facilitates maintenance work.

Fig.1 eine Ansicht einer Dosiervorrichtung mit Kugelkalotten, und mit Betätigungsorganen zur Verschwenkung der Kugelkalotten;

Fig.2 eine Seitenansicht mit Teilschnitt der Dosiervorrichtung gemäss Fig. 1 mit den Antriebsorganen für das Abstreif- und Auflockerungsorgan;

Fig.3 einen Schnitt durch die Dosiervorrichtung mit Abstreif- und Auflokkerungsorgan;

Fig. 4 eine Draufsicht auf Fig. 3, wobei die Kugelkalotten-Hälften leicht verschwenkt sind zur Freigabe einer geringen Durchflussöffnung;

Fig. 5 einen Schnitt durch eine Ausführungsvariante; und

Fig. 6 ein Detail der Antriebsritzel.

The invention will be explained in more detail with reference to the drawing. Show it:

1 shows a view of a metering device with spherical caps, and with actuators for pivoting the spherical caps;

2 shows a side view with a partial section of the metering device according to FIG. 1 with the drive members for the stripping and loosening member;

3 shows a section through the metering device with stripping and Auflokkerungsorgan;

Fig. 4 is a plan view of Fig. 3 with the spherical cap halves pivoted slightly to release a small flow opening;

5 shows a section through a variant embodiment; and

Fig. 6 shows a detail of the drive pinion.

According to Figure 1 a cone-shaped bulk hopper 1 is present, to the at the top, connect a conical or cylindrical silo-like container can. The bulk hopper 1 is open at the top and contains a bottom Outlet opening 7. This outlet opening is in the closed state covered by two spherical cap halves 3, 4. The two spherical cap halves 3, 4 are each connected to an arm 5, 6, which by one common, in a horizontal plane above the outlet opening located rotary axis 8 are pivotable. The axis of rotation 8 cuts the Center perpendicular 9. The rigid connection of the arms 5, 6 with the spherical cap halves 3, 4 is done by each attachment bracket 10, 12th

For joint movement of the two arms 5, 6 and thus the spherical cap halves 3, 4 is a linkage with joints. A vertical pestle 14 is intended, with a not shown, vertically movable, detachable up and down moving actuator together Act. The plunger 14 is guided for straight guidance in a bearing 15. At the upper end of this plunger 14 are via a first pin 16 two Joint arms 18,19 hinged. These two joint arms 18,19 form in the closed state of the spherical cap halves 3, 4 to the perpendicular bisector 9 each an acute angle: each at the top of the two articulated arms 18,19 are articulated by second bolts 20,21 lever arms 22,23 fixed. The bolts 20,21 penetrate the arms 5,6 and thus with these movement connected. These two lever arms 22,23 hang on the Drehache 8, held on the two arms 5,6 pivotally are.

At the second bolt 20,21 depending engages a spring element 25,26, for example a gas spring or a mechanical helical Spring. These spring elements 25,26 strive to the spherical cap halves 3,4 in their closed position to press. The spring elements 25,26 are each suspended on a joint 28,29 on the bulk material container 1. When opening the spherical cap halves 3.4 by upward movement of the Plunger 14 shortens the length of the spring elements 25,26 and act as energy storage in the closing direction.

The two spherical cap halves 3, 4 can in the closed state with the formation of a parting line they butt against each other or they can preferably overlap. In an overlap, the central Area of both spherical cap halves with a central, arcuate Cut 33 provided and formed so that in the Opening movement in the central area for the time being a small, hole-like Passage opening 37 is formed, which increases with increasing pivoting the spherical cap halves 3, 4 progressively increased. This makes it possible also to spend small amounts.

Inside the bulk goods container 1 is a rotatable scraper and Loosening organ 30. This is as a container interior wall formed along extending, curved in cross-section elongated arm, which - with respect to the axis of rotation - tilts backwards. The lowest Part 31 of this one or more parts executable Abstreif- and loosening organ 30 extends down to the center of the bulk material outlet and lies directly above the spherical cap shells. At a Rotation of the stripping and Auflockerngsorganes 30 thus strikes the upper part of the funnel inner wall and the lowest part 31 loosens the Bulk material, which lies directly in front of the central outlet opening, so even with small outlet opening 37 no bridging of the bulk material can arise. The drive of the stripping and loosening organ 30th takes place by means of a reduction gear 34 flanged to the container, with a pinion which engages in a ring gear 36 of a drive ring 38. This drive ring is in an annular, the container 1 outside surrounding stationary guide ring 40 stored. The drive ring 38 is arranged by a plurality of circumferentially spaced sliding shoes 42nd held by screws 44 on the guide ring 40. From the drive ring 38 protrudes a radially inwardly directed lug 46 in the stripping and Loosening member 30 into it, so that upon rotation of the drive ring 38 is taken. Between the drive ring 38 and the Guide ring 40 is a ring seal 48. The drive ring 38th and preferably also the guide ring 40 are made of a plastic with good sliding properties.

The reduction gear 34 is below with an extension 35 and a releasable coupling 39, which is intended to be with the counterpart a preferably movable motor releasably connected to become. Instead of a gear 34, a motor drive shaft could also engage directly in the ring gear 36.

As a variant, the drive could open and close the spherical cap halves 3,4 instead of a plunger by a Hand crank done with threaded spindle.

In Figs. 5 and 6 is a variant of the dosing device shown. A box-like body 50 contains a conical Funnel inner wall 52. This body 50 is solid, thick-walled Body formed, which may consist of metal or plastic.

The upper edge 54 of the base body 50 is for placing a bulk material reservoir certainly. Against the lower edge of the main body 50 is a cylindrical rotary ring 55 whose bore cylindrical or is slightly conical and the top absatzlos to a cylindrical Bore portion 59 of the main body 50 connects. This rotary ring 55, via a coupling piece 61 with a stripping and loosening organ 72 is rotatable relative to the main body 50. The rotary ring 55 is surrounded on the outside by a stationary bearing ring 56. The bore of this bearing ring 56 contains several paragraphs, of which bottom of the rotary ring 55 overlaps. The stationary attachment of the bearing ring 56 on the base body 50 is carried out by a plurality of circumferentially distributed Screw 70. Thus, the rotary ring 55 between seals 66 of Bearing ring 56 and the base 50 rotatably supported. With the rotary ring 55, a drive ring 60 is non-rotatably connected to a bore part 58 of the bearing ring 56 has a radial distance. This drive ring 60 includes a ring gear 36 which is in a side pinion 63rd (Fig. 6) engages. This engages in a drive pinion 62, which with a Shank 69 is provided with a motor drive, not shown is detachable. As a variant, the drive pinion 62nd also engage directly in the ring gear 36 or the ring gear 36th a timing belt could be looped.

The main body 50 contains two parallel outer surfaces 64. At these are the actuating means 18, 19 for the movement of the spherical cap halves supported by bearings 15. These actuating means correspond those described in connection with Figs. 1-4 and are drawn. The parts 50, 55, 56 and 60 can be made of either metal or plastic.

Upon rotation of the drive shaft 69 is thus up to the spherical cap halves 3, 4 reaching stripping and loosening organ 72 in Rotation offset and prevents bridging of the bulk material, when the spherical cap halves are opened. The stripping and loosening organ, which can be removed on the fastening device 61 is inserted, runs in the upper part parallel to the funnel wall 52 and extends down into the hole 75 and into the central area of the Spherical cap halves. In addition, the wiping and loosening organ 72 inclined backwards in the upper area relative to the direction of rotation.

Claims (11)

1. A dosing device for bulk goods, which comprises a on the top open funnel-shaped container for bulk goods (1) with movable closures arranged at the outlet end (7), the closures are designed as spherical cap halves (3, 4) pivoted at the pivot pin (8) above the outlet end, by driving means (10, 12, 14, 18, 19, 22, 23) provided for moving the spherical cap halves (3, 4) between their opened and closed position, characterised in that a rotatable loosening and scraping device (30 resp. 72) is arranged inside the container, whereby the lowest part (31) of the loosening and scraping device (30 resp. 72) extends to the area of the bottom central outlet opening of the spherical cap halves (3, 4).
2. A dosing device according to Claim 1, characterised in that the simultaneous shift of the spherical cap halves (3, 4) in opposite directions is produced by means of the arms (5, 6) extending from the pivot pin (8) and acting together with a linkage (22, 23) which acts together with a vertical plunger device (14) via intermediate rods (18, 19).
3. A dosing device according to Claim 2, characterised in that the spring devices (25, 26) engaged at the arms (5, 6) are biased to move the spherical cap halves (3, 4) into the closed position.
4. A dosing device according to Claim 2 or 3, characterised in that the intermediate rods resp. pivoted arms (18, 19) connecting to the vertical movable plunger device (14) form together an acute angle when the spherical cap halves (3, 4) are in the closed position.
5. A dosing device according to one of the Claims 1 to 4, characterised in that the drive of the loosening and scraping device (30) is realized via a drive ring (38) with a ring gear (36) located outside the container wall (1), motor-drivable via a pinion with a vertical pivot pin.
6. A dosing device according to Claim 5, characterised in that the gear unit (34), which is connected to the ring gear (36), has at its lower end a coupling part (35), providing a detachable connection to a drive motor.
7. A dosing device according to one of the Claims 1 to 6, characterised in that the stirring and scraping device (30) is tilted backwards in relation to the direction of rotation and twisted in the longitudinal direction.
8. A dosing device according to Claim 1, characterised in that the container for the bulk goods is designed as a housing-type body (50) with a conical funnel inside wall (52), the body (50) having a top edge (54) suitable for placing a holding container on it, a cylindrical swivel ring (55) with a cylindrical or slightly conical bore resting against the bottom edge of the body (50) and being rotatable in relation to the body, a bearing ring (56) with a shouldered bore surrounding the swivel ring (55) on the outside supports the swivel ring at the bottom, the bearing ring (56) being fixed to the body (50), a drive ring (60) being connected to the swivel ring (55) against rotation, the drive ring using side drive elements (62, 63) to rotate it, and the loosening and scraping device (72) extending from the inside wall of the swivel ring (55) to the inside of the bore (75).
9. A dosing device according to Claim 8, characterised in that the drive ring (60) has a gear ring (36) which is connected at least to one pinion (62, 63).
10. A dosing device according to Claim 8 or 9, characterised in that the body (50) has two flat outside faces (64) parallel to each other on which the actuating mechanism (18, 19) moving the spherical cap halves (3, 4) are mounted.
11. A dosing device according to one of the Claims 8 to 10, characterised in that axial seal rings (66) are fitted on both sides of the swivel ring (55) and the bearing ring (56) is connected to the body (50) by means of bolts (70).

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