DE19806729C1 - Metering feed for fluent bulk materials - Google Patents

Abstract

The metering feed has a feed hopper with a closure (2) in a tubular housing (21) which has two through flow openings for the material. The hopper (1) is connected with one opening (20) and a sliding closure (22) moves laterally of the housing and has a matching cross section.

Description

The invention relates to a metering device with at least one Storage container with outlet opening for free-flowing bulk goods and one arranged below the at least one storage container and that outgoing bulk receptacle with weighing cell for Weighing the bulk material, the outlet opening in the at least one Storage container can be opened or closed by means of a shut-off device.

Dosing devices of this type are known and are used, for example, for batch dosing of one or more Bulk goods components existing feed material in one Processing machine used, for example for the application an extruder with plastic granules and, if necessary, other additives. Depending on the dosing process carried out, a distinction is made between volumetric and gravimetric dosing devices.

The known gravimetric dosing devices, it is characteristic that the bulk materials to be dosed provided in appropriate storage containers and placed in batches in a container below the storage container Weighing container filled according to the desired proportion by weight become. For this purpose, everyone is in the area of the outlet opening Storage container usually a shut-off device in the form of a Gate valve arranged, which is first opened, whereupon the respective bulk material in the storage container falls into the weighing container and subsequently the gate valve when the desired one is reached  Weight proportion in the weighing vessel from a corresponding control is closed again.

In the course of the steadily increasing performance of the processing machines for which the known metering devices are used, at the same time steadily increasing demands on production accuracy are made to the Precision of the dosing device and the resulting dosing result high Requirements. For the exact weighing of the bulk material in the Weighing vessel comes here between the shut-off devices Storage containers and the weighing vessel are of central importance. You need to on the one hand, the outlet opening of the storage container within as short as possible Release and lock time and on the other hand in their locked position ensure that the outlet opening is sealed as completely as possible. There the actuation of the shut-off devices with high frequency and speed for long periods during the operation of a downstream Processing machine takes place, high mechanical Requirements with regard to wear, strength and the like to the Shut-off devices of the dosing device.

From DE 36 17 200 C2 it is known to shut off the To form a storage container in the form of a pivotable flap. At high Dosing performance, however, requires the opening or closing process for one such flap an undesirably long amount of time, resulting in Dosage accuracy leads.

From DE 32 17 406 A1 it is known as a shut-off device transverse to Direction of delivery rotating rotor with conveyor pockets in the form of chambers or to provide cells, each with a certain proportion of the Pick up the material to be conveyed when the rotor rotates and send it to the Hand over processing machines. If the rotor is at a standstill, the delivery is and dosing interrupted. Leave with such a metering device however, no highly accurate dosing results are achieved.  

It is also known from the prior art as shut-off devices Gate valve to use, the one inside a rail-like Guide sliding plate, which depending on the sliding position releases or closes the outlet opening of the storage container. This Known gate valve with longitudinally displaceable plate prove very powerful dosing devices as inadequate and prone to errors, since they are easily within their rail-like when operated very quickly Tilt the guide and also completely seal the Can not always guarantee outlet opening of the storage container. In addition, the construction of a dosing device is also involved Storage containers and weighing vessel and arranged in between Gate valves in a conventional design are very complex and may be required  conversion work on the dosing device due to Production changes or the like are difficult.

The invention is therefore based on the object of a metering device improve the type mentioned in that they are also very high performance a precise and permanently reliable dosing of free-flowing bulk goods for the processing machine and moreover a particularly simple and easy to change Production conditions adaptable structure.

This object is achieved with a metering device according to the characterizing features of claim 1 solved.

Advantageous embodiments of the invention are the subclaims removable.

According to the invention, the object is achieved in that that the shut-off device assigned to each storage container is a tubular one Housing and one transverse to the longitudinal axis of the housing through the outer surface of the housing with two openings for the opening Has bulk goods and the outlet opening of the storage container with the Passage communicates and within the tubular housing Closure part with a cross section of the tubular housing corresponding cross section is slidably guided along the longitudinal axis and the closure part depending on the respective shift position the passage opening for the bulk material within the tubular housing releases or closes.

In the context of the invention it was found that the proposed Formation of the shut-off device with a tubular housing and a appropriately trained and guided longitudinally Closure part a significant improvement in performance and dosing accuracy  the known metering devices can be achieved. Because of the in a tubular housing is displaceably guided longitudinally a much more precise guidance of the closure part within the housing of the shut-off element, causing the locking part to tilt for example with a very high confirmation speed and appropriate acceleration is prevented. At the same time, the precise guidance of the closure part within the tubular housing its mechanical wear significantly reduced, resulting in longer Life of the dosing device according to the invention leads.

In particular, it is according to an advantageous embodiment of the invention possible to form the closure part piston-shaped and within the tubular housing of the shut-off element sealing and free of play to move longitudinally. Here, the closure part within the tubular housing along its circumference longitudinally displaceable performed so that a complete seal of the passage opening and thus the outlet opening of the reservoir of the invention Dosing device can be effected, even if very fine-grained bulk goods too are dosing. The dosing accuracy of the dosing device according to the invention is significantly increased.

A preferred embodiment of the invention provides that the Shut-off devices are arranged in one level and form a shut-off unit are summarized between the storage containers and the load cell is arranged. By summarizing the storage containers assigned shut-off devices in a shut-off unit on a level between the storage containers and the weighing container become an extremely compact and simple structure of the metering device according to the invention. In particular, it is possible with a few simple steps dosing device according to the invention by adding or removing Storage containers to changed production conditions with more or less  Adapt bulk goods components, which is explained in more detail below becomes.

According to an advantageous development of the invention, the shut-off unit is a the direction of fall of the bulk components from the storage containers crossing support part with openings for the vertical case of Bulk components from the storage containers into the weighing container proposed whose passage openings with transverse to these cylindrical cavities that form the tubular housing of the shut-off devices form, communicate and in which the sliding piston-shaped Closure parts are arranged.

Another advantageous embodiment of the invention provides that the Shut-off unit has a frame-like, in particular annular support part and the shut-off elements within the supporting part in a star shape with their Longitudinal axis arranged along the diameter of the support member are.

In a further development of the invention it is also proposed that the Support part together with the tubular housings of the shut-off devices is formed in one piece, for example is made in one piece as a cast part and the supporting part in the area of its outer circumference each by Mantle surface of the support part opening into the tubular housing Has insertion opening for a closure part. This makes a modular Structure of the metering device according to the invention allows, which allows within a short period of time with different production tasks changing number of components to be dosed and their Weight proportions can be easily adjusted.

For this purpose, it is proposed that the closure parts with associated drive if necessary in the housing arranged in the support part to form Shut-off devices are insertable, so that by inserting or removing the  Closure parts with associated drive in or out of the in the support part arranged tubular housings the supporting part with shut-off devices according to the required number of storage containers within a short time can be equipped. If one or more are not used in the Carrier-shaped tubular housing of the shut-off can do this closed on the outside by means of blind plugs or the like become.

Another advantageous embodiment of the invention provides that within the supporting part of the shut-off unit in the area between two adjacent shut-off devices each have a free space and that Support part one through the outer surface of the support part into the free space has an opening opening into which a screw feeder can be inserted and can be connected to the supporting part. In this way, it is possible Dosing device according to the invention not only with storage containers and associated shut-off devices for dosing bulk material components equip, but it can also be known per se Screw feeder in addition to the storage containers with shut-off devices are used, for example, to bulk components with a very dose a small proportion of the weight into the weighing container. Here, the Screw feeder at least with its front screw end through the Insertion opening in the support part inserted into this so that the front Screw end from which the bulk material component to be dosed emerges, opens into the free space of the supporting part and the metered Bulk component in the formed below the support member Weighing container can fall.

Here, too, is the modular structure already explained above the dosing device according to the invention enables, if necessary Screw feeder on the support part on the trained there and in the free spaces between two adjacent shut-off devices Passages can be attached or removed from them.  

Through openings that are not required for screw feeders can also be used be closed with blind plugs or the like.

In this way, according to an advantageous embodiment of the Invention possible, up to six shut-off devices for associated storage containers and up to six screw feeders on the invention Dosing device to be provided. As a result, blends of Plastic granules that are fed to an extrusion or injection molding system should be, with the dosing device according to the invention for almost everyone Production request to be made.

A further increase in the dosing accuracy of the invention Dosing device can also be created in that Area of the outlet of the metering device to the processing machine mixer equipped with a rotating screw to mix the bulk material left out of the weighing vessel is provided and the Mixers at an angle of 10 to 60 °, based on the horizontal is inclined. Due to this inclined arrangement of the mixer whose operation always completely drains the inside of the mixer mixed bulk goods in the downstream of the metering device provided processing machine allows.

The invention is described below using an exemplary embodiment in the Drawing explained in more detail. Show it:

Fig. 1 is a side view of a metering device according to the invention,

Fig. 2 shows a section through the shut-off of the metering device according to the invention along the plane E in FIG. 1,

Fig. 3 in a schematic representation of a section through a shut-off of the metering device according to the invention,

Fig. 4 shows the section according to arrows AA through the shut-off in Fig. 3,

Fig. 5 shows the top view of the obturator of FIG. 3,

Fig. 6 is a section through the support part of the shut-off along the line E in Fig. 1,

Fig. 7 shows another embodiment of a support member.

In FIG. 1, a metering device for gravimetric metering of a flowable bulk material of several bulk material components in a not shown processing machine such as an extruder or an injection molding machine is shown for the production of plastic products.

The metering device has several funnel-shaped storage containers 1 with feed nozzles 10 for bulk material components with a greater proportion by weight of the bulk material to be metered, and screw feeders 7 with feed funnels 70 for bulk material components with a lower proportion of weight in the bulk material to be metered. A storage container 1 or a screw feeder 7 is provided for each bulk material component. The distribution of the bulk material components to the storage container 1 or screw feeder 7 is based on the respective weight proportion of the bulk material component in the bulk material to be dosed, since the screw feeders 7 enable a much more precise dosing compared to the storage containers 1 and are therefore intended for the components with a particularly low weight proportion.

Via a shut-off unit 9 , which will be explained in more detail below, the individual bulk material components of the bulk material to be metered enter a funnel-shaped weighing vessel 3 , which is held in a frame 6 on a weighing cell 32 in a manner known per se and by means of the weighing cell 32 a weighing of the individual bulk material components of the dosing bulk goods.

The outlet opening 31 of the weighing vessel 3 , which can be opened or closed as required by means of a closure element 33 , opens into a mixer 4 which, by means of a screw 43 which can be rotated via a drive 44, causes the weighed and metered bulk material to be mixed before the metering device is directed in the direction leaves the processing machine, not shown, via the outlet opening 5 .

For the dosing of the individual bulk material components in the gravimetric dosing process, the individual bulk material components are weighed in batches in the weighing vessel 3 by means of the weighing cell 32 . When all the bulk components have been metered into a weighing batch 3 according to their respective weight fraction, the closure element 33 releases the outlet opening 31 of the weighing vessel 3 and the contents of the weighing vessel 3 are emptied into the mixer 4 . After the closing element 33 has then been closed , a batch can be dosed again into the weighing vessel 3 , while the batch dosed before, after mixing in the mixer 4, is fed to the processing machine via the outlet opening 5 .

For metering the bulk material components located in the funnel-shaped storage containers 1 , their outlet openings 11 arranged in the bottom area can be opened or closed towards the weighing vessel 3 by means of shut-off devices 2 , so that the individual bulk goods components are opened and closed by sequentially opening and closing the shut-off devices 2 assigned to the respective storage containers 1 according to the arrow F pass through the shut-off device 2 in the weighing vessel 3 and until reaching the desired weight fractions of the bulk material component is dosed into the weighing container. 3 The shut-off devices 2 are arranged on a level E within the shut-off unit 9 , the detailed structure of which can be seen in FIG. 2 and which traverses the direction of fall F of the bulk material components from the storage containers 1 into the weighing vessel 3 .

As can be seen from this Fig. 2, the shut-off unit 9 has a frame-like annular support member 91 . The shut-off devices 2 are arranged in a star shape within the support member 91 with their longitudinal axis LA along the diameter D of the support member 91 . In the present embodiment, four gate valves 2 are arranged along the diameter of the shut-off unit 9 and in a star-shaped orientation offset by 90 ° from each other, so that accordingly four storage containers 1 for bulk material components can be opened or closed by means of this shut-off unit 9 .

Each shut-off device 2 has the structure shown in more detail in FIGS. 3 to 5. The shut-off device 2 comprises a tubular housing 21 with a circular cross section, in which a closure part 22 is guided in the longitudinal axis LA so as to be displaceable in the direction of arrow P by means of a drive rod 23 and a pneumatic cylinder 24 held outside the shut-off device.

The tubular housing 21 also has a passage opening 20 which runs transversely to its longitudinal axis LA and is formed by two openings 20 a, b aligned with one another through the outer surface of the housing 21 . The passage opening 20 serves for the passage of the respective bulk material component from the storage container 1 into the weighing vessel 3 according to arrows F. Accordingly, the storage container 1 to be closed by the gate valve 2 is fastened on the shut-off unit 9 such that its outlet opening 11 is aligned with the passage opening 20 in the shut-off device 2 . For this purpose, the passage opening 20 can be connected to the outlet opening 11 of the storage container 1 by means of a pipe socket 200 , see FIG. 1.

The closure part 22 is preferably piston-shaped and has a cross section corresponding to the cross section of the tubular housing 21 , so that it is guided in this in a sealing and play-free manner. Due to the circular and mutually corresponding cross sections of the tubular housing 21 and closure member 22 takes a play-free guidance of the closure member 22 along its entire circumference within the tubular housing 21 and thus the entire surface. The rear end of the housing preferably has a step-shaped stop 90 for the closure part 22 .

For releasing the outlet opening 11 of the reservoir 1 and thus to the filling of the weighing container 3 to the respective in the tank 1 situated bulk material component is displaced by means of the pneumatic cylinder 24 the closure member 22 in the representation according to Fig. 3 in the direction of arrow P to the right in the position illustrated in which the passage opening 20 is completely released. To close the passage opening 20 and thus to close the outlet opening 11 of the storage container 1 within the metering device, the closure part 22 in the illustration according to FIG. 3 is moved to the left by means of the pneumatic cylinder 24 until it comes to rest against the stop 90 of the tubular housing 21 . In this position, not shown in the drawing, the closure part 22 closes the passage opening 20 completely, the sealing guidance of the closure part 22 within the housing 21 also preventing the passage of very fine particles in the direction of the weighing vessel 3 , as a result of which a high dosing accuracy of the dosing device is achieved .

In addition to the already mentioned extraordinarily good sealing and thus high dosing accuracy of the dosing device, the design of the shut-off element with tubular housing 21 and correspondingly designed cylindrical closure part 22 achieves particularly precise guidance of the closure part 22 in the tubular housing 21 , so that even at high actuation frequency and acceleration the locking part 22 is prevented from tilting within the housing 21 , thereby increasing the performance of the metering device and reducing its wear.

The shut-off device 2 with a tubular housing 21 and a correspondingly designed cylindrical closure part 22 therefore enables a substantially more precise and more efficient metering of bulk goods and their components with an extended service life than was previously the case with the known shut-off devices, such as gate valves.

Another significant advantage of the shut-off elements 2 with a tubular housing 21 and correspondingly designed cylindrical closure part 22 is their extremely small space requirement, so that the aforementioned arrangement of the shut-off slide in an annular support part 91 on a plane E to a shut-off unit 9 , as shown in FIG. 2 is shown, can be realized in an extremely compact manner.

The structure of the annular support member 91 of the shut-off unit 9 is shown in more detail in FIG. 6. As can be seen from this FIG. 6, the support part 91 is formed in one piece with four tubular housings 21 for shut-off elements 2 running in a star-shaped arrangement along the diameters of the support part 91 , for example as a cast part. The openings 20 a, 20 b are formed in each tubular housing 21 to form the passage opening 20 for the bulk material. Each tubular housing 21 is guided through the outer surface of the annular support member 91 and has an insertion opening 94 , through which, if necessary, a closure part 22 with a drive rod 23 and a pneumatic cylinder 24 attached to it in the tubular housing 21 to form a shut-off device 2 as shown in FIG. 2 can be inserted from the outside in. For this purpose, in the area of the support part 91 surrounding the insertion opening 94, a flange surface 93 is formed, which is equipped with corresponding fastening means, not shown in FIG. 6, for fastening the pneumatic cylinder 24 . At the other, opposite the insertion opening 94 of the tubular housing 21 , a step-shaped shoulder 90 is formed which serves as a stop for the closure part 22 moved in the closed position when it closes the passage opening 20 in the tubular housing 21 .

When using such a supporting part 91 , it is possible to construct the shut-off unit 9 in a modular manner in accordance with the production requirements. For this purpose, the support part 91 is equipped, if necessary, with shut-off elements 2 by inserting the closure parts together with their drive, ie drive rod 23 and pneumatic cylinder 24 into the tubular housing 21 integrally formed in the support part 91 . It is therefore possible to adapt the shut-off unit 9 of the metering device to changed production conditions in a short time, which require more or less bulk goods components with a corresponding number of storage containers 1 and associated shut-off elements 2 . If a tubular housing 21 for a shut-off device 2 formed within the supporting part 91 is not used, the insertion opening 94 of the tubular housing 21 can be temporarily closed by means of a blind plug 98 .

Since the shut-off elements 2, which are designed with a tubular housing 21 , are arranged in a star-shaped manner within the supporting part 91 at 90 ° to each other and require only a small amount of space, a space 92 remains between two adjacent tubular housings 21 , which is used for metering further bulk material components into the weighing vessel 3 can be used by means of the screw feeder 7 already mentioned. For this purpose, each approximately quarter-circle-shaped free space 92 is accessible via an insertion opening 96 in the lateral surface of the support member 91 from the outside thereof, so that a screw feeder 7 with its front end region, from which the bulk material component to be metered emerges, into the free space 92 of the Supporting part 91 can be arranged opening. For this purpose, a flange surface 95 with fastening elements is also provided in the area of the support part 91 surrounding the insertion opening 96 , to which a screw feeder 7 can be fastened, see also FIGS. 1 and 2.

As can be seen from these FIGS. 1 and 2, the screw feeder 7 is fastened by means of a mounting bracket 72 on the support part 91 of the shut-off unit 9 inclined upward in the conveying direction, the metering screw 71, formed by means of the drive 73 rotatably inside the screw feeder 7 , with its front end region 71 a protrudes into the free space 92 within the support member 91 . The bulk material component to be metered by the screw feeder 7 reaches the front end 71 a of the screw 71 when the screw 71 rotates via the feed hopper 70 and subsequently falls according to arrow V in FIG. 1 through the free space 92 in the supporting part 91 into that arranged below the shut-off unit 9 Weighing vessel 3 , where it is weighed by means of the weighing cell 32 .

Here, too, a modular construction of the metering device is made possible, since, if necessary, screw metering devices 7 can be attached to the insertion openings 96 of the supporting part 91 leading to the free spaces 92 or removed from them when not in use. In such a case, the unused insertion opening 96 in the supporting part 91 can be temporarily closed by a suitable blind plug 97 .

This arrangement of shut-off devices 2 along the diameter of the supporting part 91 of the shut-off unit 9 and arrangement of screw feeders 7 between two adjacent shut-off devices 2 creates a particularly compact metering device in which all shut-off devices 2 for the storage container 1 and all screw feeders 7 on a level E within the metering device are arranged.

In particular, this design also makes it much easier to adapt the metering device to changed production conditions with more or less required bulk material components. The design of the shut-off unit 9 with a supporting part 91 shown in FIGS . 2 and 6 makes it possible to carry out a modular construction of the shut-off unit 9 and thus to equip the metering device with storage containers 1 and / or screw feeders 7 .

In the illustrated embodiment, it is therefore possible to equip the dosing device with up to four storage containers 1 with corresponding shut-off elements 2 in the support part 91 and additionally to fasten up to four screw feeders 7 to the support part 91 of the shut-off unit 9 , so that a total of up to eight bulk material components in the weighing vessel 3 can be gravimetrically weighed and made available to the processing machine. In the event that fewer bulk material components are required, the corresponding number of screw feeders 7 and / or storage containers 1 is removed from the metering device and the shut-off elements 2 belonging to the removed storage containers 1 are removed from the supporting part 91 .

The design of the support part is not limited to the embodiment according to FIGS . 1, 2 and 6 with an annular support part 91 for the equipment with four shut-off elements 2 for four storage containers 1 and four screw feeders 7 , but can also have a different design that makes it possible to attach more or less shut-off devices 2 or screw feeder 7 . FIG. 7 shows a frame-like support part 91 a with an essentially rectangular cross section, which has two tubular housings 21 lying on a line with insertion openings 94 for forming shut-off elements 2 . Adjacent to this are a total of two free spaces 92 , to which screw feeders 7 can be attached as required in the manner already explained, via insertion openings 96 .

In particular, it is also provided that the shut-off device 2 shown in FIGS . 3 to 5 for opening or closing, if necessary, even a single storage container 1 within a metering device with only one bulk material component.

In order to be able to pass on the extremely precise and efficient metering of bulk goods with great accuracy to the processing machine via the outlet opening 5 , which is realized by means of the shut-off elements 2 with a tubular housing 21 and a cylindrical gate valve 22 , the mixer 4 already mentioned is also at the outlet of the metering device by one An angle α of 30 ° is inclined with respect to the horizontal, in the present example the inclination from the inlet opening 41 of the mixer 4 to the outlet opening 42 is designed to decrease. In the context of the invention it was found that this inclined arrangement of the mixer 4 in relation to the horizontal achieves a much better mixing of the metered bulk material and, moreover, the mixer is always completely emptied, since there are no more dead spaces within the mixer housing 40 , in where material could be retained.

The dosing device explained above thus enables a particularly precise and efficient dosing of free-flowing bulk material components with particularly little wear. It is of course not limited to the embodiment shown in the drawing, but can be carried out in different dimensions and equipment to suit the respective production task. In particular, it is possible to design the metering device for different numbers of bulk material components to be metered. Here are numbers from a single component to embodiments with six shut-off elements 2 arranged along the diameter of the shut-off unit 9 or its supporting part 91 for correspondingly six storage containers 1 and accordingly six screw dispensers 7 to be fastened between two adjacent shut-off elements, which is a dosage of up to enables twelve bulk goods components.

Claims (10)

1.Dosing device with at least one storage container with an outlet opening for free-flowing bulk material and a weighing vessel arranged below the at least one storage container and receiving the emerging bulk material with a weighing cell for weighing the bulk material, the outlet opening in the at least one storage container being able to be opened or closed by means of a shut-off element, thereby characterized in that the shut-off device ( 2 ) assigned to each storage container has a tubular housing ( 21 ) and a passage opening ( 20 ) running transversely to the longitudinal axis LA of the housing ( 21 ) through the lateral surface of the housing ( 21 ) with two openings ( 20 a, 20 b) ) for the bulk material and the outlet opening ( 11 ) of the storage container ( 1 ) communicates with the passage opening ( 20 ) and within the tubular housing ( 21 ) a closure part ( 22 ) with a cross section corresponding to the cross section of the tubular housing ( 21 ) Cut is slidably guided along the longitudinal axis LA and the closure part ( 22 ) releases or closes the passage opening ( 20 ) for the bulk material depending on the respective displacement position within the tubular housing. 2. Dosing device according to claim 1, characterized in that the closure part ( 22 ) is piston-shaped and is sealingly guided within the tubular housing ( 21 ) of the shut-off element ( 2 ). 3. Dosing device according to one of claims 1 or 2, characterized in that the shut-off elements ( 2 ) are arranged in one plane (E) and are combined to form a shut-off unit ( 9 ) which is between the storage containers ( 1 ) and the weighing vessel ( 3 ) is arranged. 4. Dosing device according to claim 3, characterized in that as a shut-off unit ( 9 ) a falling direction (F) of the bulk material components from the storage containers ( 1 ) transverse support member ( 91 ) with passage openings ( 20 ) for the vertical fall of the bulk material components from the storage containers ( 1 ) is provided in the weighing vessel ( 3 ) and the passage openings ( 20 ) communicate with cylindrical cavities which run transversely to these and form the tubular housings ( 21 ) of the shut-off elements ( 2 ) and in which the displaceable piston-shaped closure parts ( 22 ) are arranged are. 5. Dosing device according to one of claims 1 to 4, characterized in that the shut-off unit ( 9 ) has a frame-like, in particular annular support member ( 91 ) and the shut-off elements ( 2 ) within the support member ( 91 ) in a star shape with their longitudinal axis (LA) along the diameter (D) of the supporting part ( 91 ) is arranged to extend. 6. Dosing device according to claim 5, characterized in that the supporting part ( 91 ) and the tubular housing ( 21 ) of the shut-off elements ( 2 ) are integrally formed and the supporting part ( 91 ) in the region of its outer circumference in each case one through the outer surface of the supporting part ( 91 ) in the tubular housing opening opening ( 94 ) for a closure member ( 22 ). 7. Dosing device according to one of claims 5 or 6, characterized in that within the support member ( 91 ) of the shut-off unit ( 9 ) in the area between two adjacent shut-off members ( 2 ), a free space ( 92 ) is formed and the support member ( 91 ) in Area of its outer circumference each has an insertion opening ( 96 ) opening into the free space ( 92 ) through the lateral surface of the support part ( 91 ), into which an auger metering device ( 7 ) can be inserted and connected to the support part ( 91 ). 8. Dosing device according to one of claims 5 to 7, characterized in that the shut-off unit ( 9 ) has a modular structure, such that closure parts ( 22 ) with associated drive, if necessary, in the support part ( 91 ) arranged housing ( 21 ) for training of shut-off devices ( 2 ) can be inserted and the supporting part ( 91 ) can be equipped with screw feeders ( 7 ) if necessary. 9. Dosing device according to one of claims 1 to 8, characterized in that up to six shut-off elements ( 2 ) for a corresponding number of storage containers ( 1 ) and up to six screw feeders ( 7 ) are provided. 10. Dosing device according to one of claims 1 to 9, characterized in that in the region of the outlet opening ( 31 ) of the weighing vessel ( 3 ) equipped with a rotatable screw ( 43 ) mixer ( 4 ) for mixing the from the weighing vessel ( 3 ) omitted Bulk material is provided and the mixer ( 4 ) is inclined at an angle α of 10 to 60 ° with respect to the horizontal.