DE19640933A1 - Discharge device for a silo, especially also for flowable bulk goods - Google Patents

Abstract

This invention concerns a discharge device (10) for a silo (17), particularly also for free-flowing bulk material, with one or more discharge openings (12) in a lower silo boundary element (11) to be formed and to which are associated drivers, which face the bulk material and slide in a straight line on the silo boundary element for transport of the bulk material into the discharge openings (12). The silo boundary (11) has parallel spaced apart supports (16) and the separation between any two supports (16) forms one or more slit-like discharge openings (12) which is completely and/or partially covered in a repeated and predeterminable way by an associated driver shaped as a cassette element (13) etc. Discharge channels assigned to the discharge openings (12) with helical conveyors (31) form along with the silo (17) a closed unit and also serve for dosed discharge. The helical conveyors (31) convey parallel to or orthogonal to the direction of travel of the drivers, can have intermediate and external discharge openings, and be mounted directly below the silo boundary element (11).

Description

The invention relates to a discharge device for a silo, especially for flowable ones Bulk goods, with one or more discharge openings in of a lower silo boundary to be formed, those for Bulk material pointing straight on the silo boundary movable carriers for transporting the bulk goods in the discharge openings are assigned.

Bulk goods are usually stored in silos. Around trouble-free storage and bulk material discharge, which is usually upright at the bottom of a section standing silos is done, to ensure silos steep wall slopes, so that all bulk goods in Silo is in motion during bulk discharge. For this it is necessary that the discharge opening must be large enough to form bridges and manholes avoid. A dosed discharge of the Bulk goods. Obtain known discharge devices hence the entire lower silo limit and the various discharge organs with one, which in the Strength problems that usually occur in bulk goods should be prevented.

A corresponding discharge device is from the EP 0 434 995 B1 is known. A dosed and a silo with a Ensure discharge device in which the Silo floor with a large number of discharge openings  is provided which have such a size that largest possible bulk material particles can pass through, however, in the idle state bridges above the discharge opening This can lead to the prevention of discharge should. A Mit sweeps during the discharge the entire surface of the silo floor. The Distances of the drivers to the discharge openings should be so small that no noticeable compression of the Bulk goods take place through the driving device. The discharge openings can be adjusted Slider that are below the Silo bottom are arranged. One below Belt or screw conveyors promote the discharged Bulk goods. This known discharge device is extremely complex because they support the bulk material the elements, such as the sliders, must be designed to be movable and thereby a burden of many tons. That is, the entire lower one Silo limitation is special for this discharge to construct direction and fails with flowable Bulk goods completely, since such bulk goods are none Forms sealing bridges above the discharge openings and therefore the discharge openings cannot be closed are. This known discharge device, as well as the further mentioned in the prior art the object of the present invention is not solve satisfactorily.

The object of the present invention is; a Discharge device for a silo, in particular also for flowable bulk goods that create one discharge that is as uniform and meterable as possible without noticeable compression of the bulk material enables a existing load-bearing lower silo boundary integrated  and can be retrofitted.

This object is achieved in that the silo boundary parallel to each other at a distance has running beams and the distance between each two carriers one or more slot-like discharge forms openings, each one assigned as Cassette element trained driver repeated and specifiable fully and / or partially covers.

Surprisingly, it has been shown that in itself always existing supports supporting the silo floor Basic elements of a discharge device according to the invention can form if their distances from each other as Discharge openings are used, which by means of across cassettes slidably arranged to these carriers elements in the design of carriers either fully or partially, depending on the desired discharge volume closed by reciprocation or be released. The drivers also serve to Block and make used in the prior art Gate valve unnecessary. Particularly advantageous for is the discharge device according to the invention also the possibility of retrofitting, since the Construction of the silo was not changed to me are needed. Such a possibility is in the state not given the technology.

According to the invention it is provided that each cassette element has a rectangular base, with in Direction of movement of a slightly larger Er stretch as the distance between two beams and about twice the width and right Edge elements angled to the beams  having. Each cassette element is thus able to the distance between two beams completely bridge and support on both beams to to load the weight of the bulk material into the carrier conduct. This makes it more complete and more secure Closure of each discharge opening, even with flowable ones Bulk material guaranteed. Regarding the width of a Cassette element has about twice the size of Longitudinal extension was found to be advantageous, just like the angled edge elements that on the one hand give the cassette elements stability and on the other hand in the longitudinal direction as thrust surfaces to serve. The cassette elements designed in this way are extremely robust, simple and inexpensive to manufacture.

It is also provided that the narrow sides of a Cassette element fixed with one guide rail each which are connected by a hydraulic drive lateral silo wall moved through and that in the case of several cassette elements per hydraulic drive these at a distance from each other between the same guide rails are arranged. This control of Cassette elements using two guide rails prevents the same from tilting during the Discharge. The maximum extension and also the number of the cassette elements can be customized to the Dimensions of the silo can be adjusted. Several Cassette elements are thus spaced from one another of two beams between the guide rails arranged, then by at least one hydraulic system drive can be moved. The hydraulic drive can do this pulling and / or pushing outside the silo be arranged and is therefore not special  Exposed to pollution and easily accessible.

It is also advantageously provided that the maximum possible effective width of each slit-shaped Discharge opening about twice the distance of Cassette elements correspond to each other, the at the same time its greatest possible longitudinal extent certainly. From this it follows that the largest possible Exit cross-section used between the beams can be.

It is also provided that the guide rails Guide walls are assigned to the side, which Support guide elements that go the shortest way arranged in a bridge-like manner above each cassette element Direction of thrust oblique wipers connected to each other are. This is particularly advantageous staltung that the movable so movable Guide rails with associated cassette elements extremely robustly stored between the guide walls are. Cassette elements arranged side by side can therefore not get caught in each other. The Wipers that are securely inserted into the Guide walls are stored, take over dual function. The cassette elements are through the slots formed are pushed back and forth, whereby the scrapers on the one hand bulk material on the cassettes completely strip off the elements, which are then in the nearest discharge opening, i.e. between the Carrier arrives. On the other hand, the wipers prevent them with pushing movement of the cassette element, that this, once jammed, bulges upwards, so to speak can.  

According to the invention it is further provided that the movement the cassette elements in the direction of the longitudinal extent of the guide rails over a maximum distance that is the distance between two beams corresponds to and control every intermediate size of this maximum strokes in the form of a reciprocating motion guaranteed. This can be done only through the Control of the hydraulic drive, so extremely easy to dose the bulk material to be discharged be accomplished.

It is also provided that the scraper from a Angle profile is formed, its angle to the bulk material has and is arranged above each carrier, that he deposited on a cassette element Bulk material with a maximum movement completely wipes off. As already mentioned, the Scraper on sloping flanks in the direction of thrust are inclined towards the cassette elements. Your Positions and dimensions are chosen in such a way that a cartridge element at maximum movement is completely cleared. This is also the case with one Total emptying of the silo is particularly advantageous. Since the Scraper can also run up to a point do not deposit any bulk goods on it.

It is also advantageously provided that the through guides the silo wall for the guide rails like this are designed so that they are fully open most of a cassette element record, with the corresponding scraper only one has a sloping flank pointing towards the interior of the silo, and that that this silo wall was the most distant Cassette element then ends on a carrier that in  a distance from the opposite silo wall is the distance between two beams corresponds. This makes it possible for the Be range in which a row with cassette elements on the one hand, the silo walls do not close at all and on the other hand, extremely small projections to the exit oppose the bulk goods. Halfway through Wipers have largely eliminated this problem.

According to the invention it is further provided that double T-Trä lying and / or standing and / or other Carriers are used, each for bulk goods have facing carrier end plates, which laterally are chamfered. To be completely independent of the type to be the carrier, although, because of the low Height, a horizontal double-T beam preferred for Carrier end plates can be used provided on which are bevelled laterally to tilting when a locking element engages to prevent.

It is also provided that, depending on the size of the Silo cross section with one or more rows Cassette elements in parallel next to each other above the Beam completely covering the bottom silo boundary are arranged. Although an inventive Discharge device with only one cassette element is conceivable can be an inventive Discharge device with several rows any number of modular elements be, making it easy to adapt to virtually everyone Silo cross section is possible. So there is one Retrofittable and modularly expandable discharge device direction available.  

It is also provided that the one with each row Hydraulic drive assigned to cassette elements opposite a corresponding opposite working hydraulic drive is assigned to in always a tensile load in both directions of movement to ensure the guide rails. This will the case of the shear load on the guide rails, with the risk of bulging them in bulk goods direction, excluded. Implementation by the Silo wall is also open for the further hydraulic drive the guide rails limited.

According to a special embodiment of the invention provided that the discharge openings in the area below half of the cassette elements are coarse or delicate Have grids. This is the easiest way prevents objects from being carried away could damage the subsequent discharge device. By simply disassembling the grille, you can Items are removed. The silo does not have to be totally emptied.

According to a further advantageous embodiment of the Invention is provided that the silo cross section in the lower limit of the silo directly after Section through the rectangular shape of one or several rows with cassette elements is specified and in sections above it any has a cross-section. That is, the silo cross section is only in the lower area of the discharge device dependent to make it work guarantee. Above this lower range the cross section can then be designed as desired.  

According to a further advantageous embodiment of the Invention is provided that below the carrier or several V-shaped or vertical discharge channels run in their lowest section each one in the direction of movement of the cassette elements have conveying screw conveyor. Hereby can influence the weather during removal be completely excluded and already one Subdivision of the discharge amount for example Be loaded by truck or the like.

It is also advantageously provided that several Discharge channels up to one per row or Carrier gap in the case of poorly flowing bulk material or less vertical height below the silo boundary for steep canal walls are provided. This can also cause poorly flowing bulk goods be safely removed. It can then be a row Abförderkanal be provided. When particularly bad flowing bulk material can also be orthogonal to it be arranged so that it in the area of Space between two beams in its Alignment runs. The maximum upper opening of one then arranged discharge channel only corresponds the distance between two beams and still allows steeper canal walls, up to the vertical extension direction.

It is also advantageously provided that the channel walls each tangential or by one or both side paragraph in the transition area to the snail flow into the conveyor. Especially with not so steep Channel walls can thereby the effective peripheral surface the screw conveyor can be increased.  

It is also advantageously provided that a control of the cassette elements depending on the screw conveyor which takes place in such a way that a portionwise intermediate Storage of bulk goods in the discharge channels guaranteed is accomplished. This temporary storage will Storage volume of the silo increased significantly without that the silo itself could be enlarged.

It is also provided that the screw conveyor at least at least one outside and / or middle exit lengthways and / or orthogonal to their stroke direction. Here can be adapted to the given space nisse. In addition, it is envisaged that the Duct walls dustproof and against weather influences form a closed unit with the silo. Here influences on the environment are excluded.

Further preferred configurations of the invention result from the subclaims. An execution example of the present invention will be referenced take explained in more detail on a drawing. It shows:

Fig. 1 is a schematic partially sectioned plan view of a lower Silobegrenzung with open discharge a Austragsvor direction,

Fig. 2 is a schematic plan view of a discharge apparatus of a series with Kassettenele elements and unilateral hydraulic drive,

Fig. 3 is a schematic side view of Fig. 2,

Fig. 4 shows a schematic section along line AA in Fig. 3,

Fig. 5 is a schematic representation of a Ausschnit tes D in Fig. 3,

Fig. 6 is a schematic plan view of a series of cassette elements without guide walls and scrapers,

Fig. 7 is a schematic side view of Fig. 6 with different carriers, and

Fig. 8 is a schematic cross section of various arrangements of discharge channels.

Fig. 1 shows a schematic partially sectioned plan view of a discharge device 10 according to the invention, in particular a lower silo delimitation 11 with a plurality of opened discharge openings 12 which run from left to right in the conveying direction according to arrow C in FIG. 1 and of four rows 15 arranged one above the other be formed with cassette elements 13 . The cassette elements 13 are arranged at a distance 14 from one another in rows ( 15 ). The rows 15 run at right angles to parallel and at a distance from one another in FIG. 1 not visible carriers 16 which run below the visible cassette elements 13 .

The silo 17 shown in FIG. 1 is determined by the dimensions and the cross section of the four rows 15 with cassette elements 13 arranged parallel to one another. In this area, the silo 17 essentially has a rectangular cross section, which above the discharge device 10 , that is to say to the viewer, can also assume any cross section, for example a circular cross section according to line 18. As can be seen, the discharge openings 12 are partially provided with grids 19 . The grids 19 are arranged between the carriers 16 and, as the grids 19 partially shown by way of example show, can be of different finishes or coarser. The grids 19 serve primarily to protect a downstream discharge device against objects which happen to be present in the bulk material and pass through the discharge device 10 into the discharge device and for screening bulk material which has clumped together. Of course, all discharge openings 12 are to be provided with them if necessary.

Without the position indicated in Fig. 1 Austragsvor device 10 only the supports 16 would be in Fig. 1 can be seen within the silo 17, 11 form the lower limitation which Silobe and are usually sealed with floor elements. In other words, the silo 17 thus conceived is a standard silo which has an upper storage body with a lower silo boundary 11 made of spaced-apart supports 16 which take up the weight load of the bulk material. The discharge device 10 according to the invention is therefore particularly suitable for retrofitting such standard silos, since it can be seen that the existing carrier 16 is used in an inventive manner. This is done in that the rows 15 are shifted via hydraulic drives 20, not shown, in such a way that the cassette elements 13 convey bulk material into the discharge openings 12 and completely but partially close them, and this process is repeated.

FIG. 2 shows a schematic top view of a discharge device 10 comprising only one row 15 with cassette elements 13 and a hydraulic drive 20 arranged on one side. The hydraulic drive 20 is in Fig. 2 left and outside of a silo wall 21 angeord net, which openings for two guide rails NEN 22 per row 15 and for a cassette element 13 has. The opposite silo wall 21 shown in FIG. 2 has no through openings, since the hydraulic drive 20 shown enables a back and forth movement of the guide rails 22 according to arrow C. However, it is often desirable that the hydraulic drive 20 is opposite to an associated further hydraulic drive 20 to the guide rails 22 to move in each direction of movement C with a tensile force so that, for example, bulging of the guide rails is excluded. In such a case, at least two through openings for the guide rails 22 are to be provided in the right-hand silo wall 21 in FIG. 2. Inside the silo walls 21 , guide walls 23 are arranged above the supports on both sides of the guide rails 22 , in which guide elements 24 extend longitudinally and for guiding the guide rails 22 , which are connected by means of a plurality of wipers 25 . The wipers 25 connect the guide elements 24 by the shortest route in the area of the carriers 16 . Upon displacement of the cartridge 13 elements in the conveying direction according to arrow C pass through the cassette elements 13 almost completely slots, which are formed from a support 16, the guide members 24 and a scraper 25th The surface of a cassette element 13 facing the viewer, which runs through this slot, is completely freed of bulk material. In the open state shown, the guide rails 22 end at a distance in front of the silo wall 21 on the right in FIG. 2, which corresponds to the distance of the carriers.

Fig. 3 shows a schematic side view of Fig. 2. In addition to anchoring the hydraulic drive 20 , the silo walls 21 and the other in Fig. 1 and 2 recognizable and described objects, to the description of which reference is made, the carriers 16 and their interaction with the Kassettenele elements 13 and 25 scrapers can be seen. From the stand 14 between two cassette elements 13 is namely chosen slightly smaller than the distance between two carriers 16th This is so that when the discharge openings 12 are completely closed by the cassette elements 13, the weight of the bulk material is reliably introduced into the carrier 16 . The cassette elements 13 advantageously have a double width of this distance 14 . The previously described positioning of the wipers 25 is now such that they run as close as possible to the edge of a discharge opening 12 and have a certain width above the carrier. The wipers 25 are advantageously formed from an angular profile, the tip of which points towards the bulk material, so that its symmetrical flanks run obliquely to the conveying direction C and are therefore particularly suitable for wiping bulk material. As can be seen, the left-hand silo wall 21 in FIG. 3 almost completely receives a cassette element 13 in the open state, which protrudes only slightly into the interior of the silo. This area is provided with a half scraper 25 , which has only one flank, in order to avoid effects on the bulk material during discharge.

FIG. 4 shows a schematic section along the line AA in FIG. 3. The slot formed from a carrier 16 , the guide elements 24 and the wiper 25 has been described above, which can be clearly seen here in FIG. 4. The guide elements 24 are evidently anchored in the guide walls 23 , for example encapsulated therein with reinforcing bars. The wipers 25 can be welded to the guide elements 24 . The cassette elements 13 have edge elements 27 angled at right angles to the supports 16 on all four sides, two of which are used for screwing to the guide rails 22 and the edge elements 27 pointing in the conveying direction form thrust surfaces 28 .

FIG. 5 shows a schematic illustration of a detail D in FIG. 3. Although reference is also made in detail to the description in FIG. 3, the through openings of the silo wall 21 are shown more clearly here. The silo wall 21 is advantageously held in a steel structure. The bushings therein are designed in the manner of a slot, so that a single slot for a cassette element 13 including guide rails 22 is provided, which slot is then connected to a hydraulic drive 20 . The one-sided scraper 25 is designed as an oblique plate and ends in the region of the first discharge opening 12 . Beam end plates 29 , which are arranged above the beams 16 , can be clearly seen. The end plates 29 are slightly wider than the carrier 16 and ensure, regardless of different carriers 16 , an exact adherence to the above-mentioned distances. This is particularly important when retrofitting existing silo systems. In addition, the end plates 29 are beveled in the conveying direction C to the cassette elements 13 , so that the latter can slide safely without tilting on the end plates 29 th

Fig. 6 shows a schematic plan view of a row 15 with cassette elements 13 without guide walls 23 and wipers 25 , similar to Fig. 2, reference is made to the description thereof. In addition to the hydraulic drive 20 , only the guide rails 12 are actually visible and the hatched, actually formed discharge openings 22 , of which the one on the far right in FIG. 6 is the largest, since the guide rails 22 are omitted there and a greater width is available and at the same time the corresponding last cassette element 13 , as can be seen in FIG. 3, does not protrude beyond the carrier edge, so that the largest possible carrier spacing can also be used. This changes with a double hydraulic drive.

FIG. 7 shows various beams in a schematic side view of FIG. 6. Although a double T-beam in a lying shape is preferred as beam 16 because of the particularly low overall height, such a beam can of course also be used standing. The fourth beam 16 from the right, shown in FIG. 7, is a horizontal and the fifth a vertical double-T beam. Of course, any form of support, for example made of reinforced concrete, can also be used, as it is shown hatched. In order to give all of these carriers a surface adapted to the discharge device 10 , the end plate 29 is arranged on them.

Fig. 8 shows a schematic cross section ver VARIOUS arrangements of Abförderkanälen 30 which are arranged at below the Silobegrenzung. 11 Depending on the flowability of the bulk material and the height available vertically below the silo delimitation 11 , a single symmetrical conveying channel 30 with a screw conveyor 31 conveying in the conveying direction C or another conveyor, e.g. B. conveyor belt, trough chain conveyor, etc. are provided and, for example, four rows 15 assigned. As can be seen from FIG. 8, the channel walls 32 are then relatively flat despite the great height. To avoid this, deeper channels can be used if possible. If this is not possible, then steeper walls can be made possible by using two channels 30 , which are then each assigned to two rows 15 . Here, too, changes in height lead to channel walls 32 of different steepness. In order to make the channel walls 32 even steeper, only one channel per row 15 can be used. It is also conceivable to let the discharge channels 30 run below the discharge openings 12 , i.e. parallel to the carriers 16 , as a result of which the widest opening of the V-shaped or vertical discharge channels 30 is then reduced and in relation to the width / length of the discharge openings 12 steep channel walls 32 are possible even at the lowest heights. Visible, the channel walls can open into the transition area to the screw conveyor 31 32 either tangentially or by a one or two-sided paragraph 33rd As a result, the effective circumferential surface for the screw conveyor 31 can be increased in the case of not so steep channel walls.

The control, not shown, electrical and / or pneumatic type, moves the guide rails 22 and thus the discharge Kassettenele elements 13 above the discharge openings 12 with a predetermined stroke back and forth, so that metered bulk material is discharged in the desired amount. This can even take place depending on the screw conveyor 31 in such a way that intermediate storage of bulk material in the discharge channels 30 is possible in portions. This even increases the storage capacity of a silo. The discharge channels are also used to hold a certain amount of bulk goods if metered discharge is necessary.

The features of the invention disclosed in the above description, in FIGS. 1 to 8 and in the claims can be essential both individually and in any combination for realizing the invention in its different embodiments.

Claims (19)

1. Discharge device for a silo, in particular also for flowable bulk material, with one or more discharge openings in a lower silo boundary to be formed, which are assigned to the bulk material, linearly movable carriers on the silo boundary for transporting the bulk material into the discharge openings, characterized in that the silo delimitation ( 11 ) has mutually parallel carriers ( 16 ) and the distance between two carriers ( 16 ) forms one or more slot-like discharge openings ( 12 ), each of which is assigned an associated carrier designed as a cassette element ( 13 ), repetitively and presettably full and / or partially covers. 2. Apparatus according to claim 1, characterized in that each cassette element ( 13 ) has a rectangular base, with in the direction of movement a slightly larger extension than the distance between two carriers ( 16 ) and approximately twice the width and at a right angle has angled edge elements ( 27 ) to the supports ( 16 ). 3. Apparatus according to claim 2, characterized in that the narrow sides of a cassette element ( 13 ) are firmly connected to a guide rail ne ( 22 ) which drives a hydraulic drive ( 20 ) through a lateral silo wall ( 21 ) and that in the case of several cassette elements ( 13 ) per hydraulic drive ( 20 ), these are arranged at a distance from one another between the same guide rails ( 22 ). 4. The device according to claim 3, characterized in that the largest possible effective width of each slot-shaped discharge opening ( 12 ) corresponds approximately to twice the distance of the cassette elements ( 13 ) from each other, which simultaneously determines its greatest possible longitudinal extent. 5. The device according to claim 4, characterized in that the guide rails ( 22 ) are laterally assigned to guide walls ( 23 ) which support guide elements ( 24 ), the shortest way over bridge-like element above each Kassettenele element ( 13 ) arranged in the pushing direction oblique stripper ( 25 ) are interconnected. 6. The device according to claim 5, characterized in that the movement of the Kassettenele elements ( 13 ) in the direction of the longitudinal extension of the guide rails ( 22 ) over a maximum distance which corresponds to the distance between two carriers ( 16 ) and a control of each intermediate size guaranteed this maximum stroke in the form of a reciprocating movement. 7. The device according to claim 6, characterized in that the scraper ( 25 ) is formed from an angular profile, the angle of which faces the bulk material and is arranged above each carrier ( 16 ) in such a way that it deposits bulk material on a cassette element ( 13 ) completely stripped of a maximum movement. 8. The device according to claim 7, characterized in that the bushings of the silo wall ( 21 ) for the guide rails ( 22 ) are designed such that they take up most of a Kassettenele element ( 13 ) with fully open discharge openings ( 12 ), the corresponding scraper ( 25 ) has only one inclined flank facing the interior of the silo, and that the cassette element ( 13 ) furthest apart from this silo wall ( 21 ) then ends on a support ( 16 ) which is at a distance from the opposite silo wall ( 21 ) is arranged, which corresponds to the distance between two carriers ( 16 ). 9. The device according to claim 8, characterized in that double-T beams lying and / or standing and / or other supports are used, each of which has bulk-facing support end plates ( 29 ) which are chamfered on the side. 10. The device according to claim 9, characterized in that, depending on the size of the silo cross-section, one or more rows ( 15 ) with Kassettenelemen th ( 13 ) in parallel side by side above the carrier ( 16 ) the lower silo limit '( 11 ) are arranged fully covering . 11. discharge device according to claim 10, characterized in that which is associated with a per row (15) with the cassette elements (13) associated Hydraulikan drive (20) opposite a corresponding opposite working hydraulic drive (20) in both directions of movement always a tensile load to the To ensure guide rails ( 22 ). 12. The device according to one or more of the preceding claims, characterized in that the discharge openings ( 12 ) in the region below the cassette elements ( 13 ) have coarse or delicate grids ( 19 ). 13. The device according to one or more of the preceding claims, characterized in that the silo cross section in the border to the lower silo boundary ( 11 ) directly adjoining section by the rectangular shape of the one or more rows ( 15 ) with cassette elements ( 13 ) is predetermined and has any cross-section in sections above it. 14. The device according to one or more of the preceding claims, characterized in that below the carrier ( 16 ) one or more V-shaped or vertical discharge channels ( 30 ), each one in its lowermost portion in the direction of movement of the cassette elements ( 13th ) conveying screw conveyor ( 31 ). 15. The apparatus according to claim 14, characterized in that a plurality of discharge channels ( 30 ) up to one each row ( 15 ) or carrier space for poorly flowing bulk material or low vertical height below the silo boundary ( 11 ) for steep channel walls ( 32 ) are. 16. The apparatus according to claim 15, characterized in that the channel walls ( 32 ) open tangentially or through a one or both sides shoulder ( 33 ) in the transition region to the screw conveyor ( 31 ). 17. The apparatus according to claim 16, characterized in that a control of the Kassettenele elements ( 13 ) in dependence on the Schneckenför derer ( 31 ) is carried out in such a way that a batchwise intermediate storage of bulk material in the discharge channels ( 30 ) is ensured. 18. The apparatus according to claim 17, characterized in that the screw conveyor ( 31 ) have at least one outer and / or central outlet along and / or orthogonal to their stroke direction. 19. The apparatus according to claim 18, characterized in that the channel walls ( 32 ) dust-tight and against weather influences form a closed unit with the silo ( 17 ).