EP1220805B1 - System and method for withdrawing bulk material - Google Patents

Abstract

The discharge system for pourable goods from a container (10) incorporates a discharge appliance (23) placed at the outlet of the container. A conveyor conveys pourable goods flowing out of the container into the discharge appliance contrary to the discharge direction to a distributor part of the discharge appliance. A vacuum arrangement (39) is attached to the discharge appliance. An air inflow arrangement (17,19,20) conducts air for fluidization into the pourable goods in the container.

Description

The invention relates to a system and a method for removing Bulk goods from a container, in particular from a box-shaped Transport container.

Bulk goods, especially hard-flowing bulk goods such as Diatomaceous earth, silica gel or brewing plaster, used as a filter medium in food production be used and as such a crystalline Have structure, are after production, i.e. after firing and coloring as a fine powder usually packed in sacks and such from manufacturer to consumer. so to the food manufacturers like Breweries and the like.

The sacks are then specially designed for the consumer Devices opened to transfer the bulk material into silo containers, in which the bulk material, so z. B. diatomaceous earth, silica gel or brewing plaster and from which the required quantities are taken can be.

In the entire handling of such dusty or powdery Bulk goods whose grain size is so small that the bulk material dust is unhindered into the lungs of people, care must be taken that no dust escapes to the health of the people not endanger who handle and use such bulk goods.

For the removal of hard-flowing, dusty bulk goods from silo containers a system for storing them is already known from EP 0 713 473 B1 is known in which at an outlet region of a silo container Removal device is attached. which has a conveyor that is arranged coaxially to the container axis to remove bulk material from the lower Area of a funnel coaxial to the container axis against gravity upwards, i.e. essentially against the flow direction of the Bulk goods in the container. to promote a discharge area. To the discharge area a bulk material suction device is connected to Aspirate bulk material made flowable by the conveying process to be able to.

Furthermore, it is already known for the transport of poorly flowing bulk materials Use pressure tanks that are pressurized with compressed air from several bars can be used to fluidize the bulk material, so to flow do. To remove bulk material from the pressure tank, one is used the Venturi principle uses suction device that works with compressed air is operated.

Such pressure tanks are basically suitable for the transport of bulk materials that are not free-flowing or poorly flowing, but are extreme expensive because they have to withstand high pressures.

GB 2,116,938 A describes a container with a plastic lining, whose bottom is designed so that compressed air from below into a in the container powder material can be introduced. On the ground Air supply cushions are provided inside the lining, which consist of a lower air-impermeable material and an upper porous material are made so that powdery material that on the air supply cushion lies, inflowing air can be exposed to the powdery Fluidize material from outside to inside. The removal of the fluidized powdery material is then carried out with the aid of a pneumatic conveyor.

The invention has for its object a system and a method for Removal of bulk goods from a container, in particular from a box-shaped one To provide transport containers that are simple and reliable Removal of poorly flowing bulk goods even after a long Transport enables without having to apply high pressures.

This object is achieved by the system according to claim 1 or the method according to claim 8 solved. Advantageous further training and Embodiments of the invention are described in the respective subclaims.

According to the invention, the system for removing bulk material from a Container an air supply device with the air for fluidization bulk material can be introduced directly into the interior of the bulk material in the container is. This makes it possible, even through a long transport to mix heavily consolidated bulk material with air from the inside, So to fluidize it in connection with the discharge technology flows for a discharge.

It is particularly important that the air supply device at least has a tube with an air-permeable wall that is connected to a pressure source can be connected and that in a container area located in front of the outlet area is attachable, the tube with an air-permeable wall is made of a porous sintered material.

By using such a tube, it is easy allows the air to enter the air directly over a larger area Introduce bulk material and loosen it up from the inside fluidize.

To make the tube sufficiently rigid for insertion into the bulk material, is provided in an advantageous embodiment of the invention, that the tube with air-permeable wall in one essentially cylindrical support frame arranged from longitudinal and circumferential webs is, the longitudinal webs substantially helical around the Run pipe with air-permeable wall around.

It is particularly useful if the to be arranged in the container A drilling thread is arranged at the end of the tube with an air-permeable wall is. By combining the drilling thread with the helical Longitudinal webs of the support frame is the introduction of the Tube for supplying air to the bulk material is considerably simplified.

The fluidization of the bulk material in the area in front of the outlet area to improve and equalize the container is at a practical Embodiment of the invention provided that the air supply device has a plurality of tubes with air-permeable walls, the plurality of tubes each provided in a support frame essentially of the same length and attachable parallel to each other in the container are.

In order to facilitate the use of the system for the removal of bulk goods, is provided in an advantageous development of the invention, that can be connected to the compressed air source on each pipe in the area End a sleeve is attached with which the tube in a holding sleeve is attachable. provided on an adapter frame attachable to the container is, a connectable to the compressed air source on the adapter frame Collective pressure chamber is provided to which each pipe with air-permeable wall can preferably be connected by means of a pressure line is.

A particularly preferred embodiment of the invention is characterized by this out. that the container is a liner made of flexible. air-impermeable Has material in which the bulk material in particular during a transport is protected against environmental influences.

By using a lining according to the invention essentially all conventional containers, in particular also box-shaped transport containers, such as. B. sea containers used for transport of various types of goods used on ships and trucks are used for the transport of bulk goods, in particular of use hard-flowing bulk materials such as diatomaceous earth and the like.

To protect the bulk goods from moisture and moisture during transport to protect the like and on the other hand to enable dust-free removal, is provided in an advantageous embodiment of the invention, that the liner can be cut or cut air supply area has, which is initially tightly closed and one after the other externally extending flexible sealing sleeve are surrounded, the Lining also an initially tightly closed outlet area for bulk goods, which also extends from an outward flexible sealing sleeve surround and open on or can be cut out.

In particular, before or at the start of the removal of bulk material from the Container to be able to control the fluidization of the bulk material provided that the lining in one of the outlet area for bulk material remote area has an air outlet to which a external hose connects, the free end of which can be sealed is.

To further facilitate the removal of the bulk material and both a so-called Formation of bridges in which the bulk material is arched to the Sections surrounding the outlet or the removal device supports, as well as a so-called chimney formation in which Bulk material remains in the side areas of the container, to avoid is provided in a particularly expedient embodiment of the invention, that at least two removal devices are provided. the both with regard to the direction of flow of the bulk material as well as with respect to the Gravity is placed side by side at the outlet area of the container are.

It is particularly advantageous if each removal device has its own Has funnel section in which the respective conveyor with its conveyor essentially coaxial to the funnel axis is arranged.

For universal use of the removal system according to the invention of bulk goods is expediently provided that each tapping device can be attached to the container by means of an adapter frame is.

The method according to the invention for removing bulk material from a Transport container, which at an outlet area of the container Removal device is attached, bulk material in the removal device essentially against its outflow direction from the container into one Discharge area of the removal device is promoted, and bulk goods is extracted from the discharge area, characterized in that air is introduced into the bulk material in the container so that the Bulk material is fluidized, preferably at least two removal devices both with regard to the direction of outflow of the bulk material and also with regard to gravity side by side at the outlet area of the container be attached.

In a particularly advantageous embodiment of the invention The procedure is planned. that the discharge area of the sampling device Air can be supplied via an adjustable secondary air valve to an independent To allow suction air flow, which is via the secondary air valve supplied air is reduced. as soon as the bulk material in the container is sufficiently fluidized to increase the bulk material discharge.

The air is expediently used to fluidize the bulk material of a tube having an air-permeable wall in a front the container area located in the outlet area is introduced into the bulk material.

About the fluidization of the bulk material, i.e. loosening and whirling of bulk goods with supplied air to improve and equalize is provided according to the invention that for introducing air into the Bulk material several pipes with air-permeable walls are used, the plurality of tubes for introducing air into the bulk material are arranged essentially the same length and parallel to each other.

It is advantageously provided that the plurality of pipes for Introducing air into the bulk material from a common compressed air source can be supplied with compressed air via a collective pressure chamber.

It is particularly advantageous if before the actual removal begins of bulk material from the container air for fluidizing the bulk material in the container is introduced while being removed from the outlet area lying area of the container escapes from this air, the Filtered air escaping from the container and on carried Bulk material is monitored.

Figur 1 eine schematische, geschnittene Seitenansicht eines kastenförmigen Transportbehälters.

Figur 2 eine schematische Schnittdarstellung eines Ausschnitts eines Transportbehälters mit daran angeordnetem Entnahmegerät und Luftzuführeinrichtung,

Figur 3 einen schematischen Schnitt durch ein erfindungsgemäß eingesetztes Entnahmegerät,

Figur 4 eine schematische Darstellung einer sogenannten Luftzuführlanze mit einem Rohr mit luftdurchlässiger Wand,

Figur 5 eine schematische Seitenansicht eines Adaptergestells zur Anbringung von Entnahmegeräten und Luftzuführeinrichtung an einem kastenförmigen Transportbehälter,

Figur 6 eine teilweise geschnittene schematische Darstellung zur Erläuterung der staubdichten Durchführung einer Luftzuführlanze durch eine im Behälter vorgesehene Auskleidung.

Figur 7 eine schematische Draufsicht auf eine geöffnete Seite eines Transportbehälters, insbesondere eines sogenannten Seecontainers mit daran angebrachtem Adaptergestell, und

Figur 8 eine vereinfachte schematische Seitenansicht eines auf einem Lkw befindlichen Transportbehälters bei der Entnahme von Schüttgut nach dem erfindungsgemäßen Verfahren mittels daran angebrachten Entnahmegeräten und Luftzuführeinrichtung.

The invention is explained in more detail below, for example with reference to the drawing. Show it:

Figure 1 is a schematic, sectional side view of a box-shaped transport container.

FIG. 2 shows a schematic sectional illustration of a section of a transport container with a removal device and air supply device arranged thereon,

FIG. 3 shows a schematic section through a removal device used according to the invention,

FIG. 4 shows a schematic illustration of a so-called air supply lance with a tube with an air-permeable wall,

FIG. 5 shows a schematic side view of an adapter frame for attaching removal devices and air supply device to a box-shaped transport container,

Figure 6 is a partially sectioned schematic representation for explaining the dust-tight implementation of an air supply lance through a lining provided in the container.

Figure 7 is a schematic plan view of an open side of a transport container, in particular a so-called sea container with an adapter frame attached to it, and

FIG. 8 shows a simplified schematic side view of a transport container located on a truck when bulk goods are removed by the method according to the invention by means of removal devices and air supply devices attached to them.

In the different figures of the drawing are corresponding to each other Provide components with the same reference numerals.

Although the system according to the invention for removing bulk material from a container is basically used for containers of various shapes can be, it can be particularly advantageous in box-shaped Use shipping containers and is therefore related below with a so-called sea container, as used today for the Transport of various goods used by truck, train and ship is described.

Figure 1 shows schematically a box-shaped sea container 10 with a lining 11 is provided. The lining 11 consists of a air and moisture proof, flexible material and is essentially adapted to the box shape of the sea container 10 so that they bottom and Side walls covered and one to the top of the sea container essentially has parallel web as a cover. To the lining in the sea container 10 according to the shape of the sea container 10 to be tent-like, there are loops 12 for hanging the lining 11 provided in the sea container 10, only a few of which are schematic are indicated.

The lining 11 has one during the filling of the sea container 10 with bulk material and tightly closed outlet area during transport 13 on that of an outwardly extending flexible Sealing sleeve 14 is surrounded. The sealing sleeve 14 is airless attached waterproof to the liner 11. Also are outside on the lining 11 adjacent to the sealing sleeve 14 of the Outlet area 13 in the area of a removable, not shown Container rear wall further sealing sleeves 15 (of which only one is provided) that surround the air supply areas 16, which also are tightly closed at first and only for unloading the sea container be opened to a so-called air supply lance 17 (see Figures 2 and 4) into the interior of the sea container 10 can.

FIG. 2 shows the lower right corner of a sea container 10 in FIG. 1 removed rear wall, in the lower area that of the rear wall released opening of the sea container 10 an adapter frame 18th is appropriate. On the adapter frame 18 that shown larger in Figure 5 is, a collective pressure chamber 19 is attached, which via a pressure line 20. which can be designed as a pressure hose, with a schematic indicated compressed air source 20 'is connected. Also are on the adapter frame 18 a plurality of holding sleeves 21 next to each other at a distance arranged (see Figure 7) to a plurality of air supply lances 17th to keep.

Furthermore, the adapter frame 18 has a lead frame 22 on which Removal devices 23 are attachable. For fastening the removal devices 23 on the connecting frame 22 of the adapter frame 18 are quick-release means 24 provided.

As shown in FIGS. 2 and 3, each of the removal devices 23 has one Housing 25 with a funnel section 26 and a transition section 27 on. On a bottom flange 28 is a drive motor 29 for a Conveyor 30 attached.

As shown in Figure 3, the conveyor 30 has a drive shaft 31, which in a manner not shown via a gear from Drive motor 29 is driven and coaxial with the funnel axis of the Funnel section 26 of the housing 25 is arranged. On the drive shaft 31, a screw conveyor 32 is arranged, for example, by a Delivery pipe 33 is surrounded. The position of the conveying direction relative to Depending on the operating conditions, the funnel axis can be the one to be conveyed Bulk and the location of the discharge area can be changed. Important is however, that the federal direction opposes an essential component for the outflow direction of bulk material from the sea container 10.

When the conveyor is in operation, the screw conveyor 32 conveys Bulk in the direction from bottom right in Figure 3 to top left, like is indicated by the two arrows shown in the conveyor pipe 33. The lower one. inlet-side end of the conveyor tube 33 can be a stirring device 34 may be assigned, which flows into the funnel section 26 Bulk material in the fluidized, flowable state holds and the conveyor pipe 33 or the screw conveyor 32 feeds. The outlet side of the delivery pipe 33 is surrounded by a cap 35. that an annulus 36 between the cap 35 and the delivery pipe 33 is formed by the outlet side Bulk material emerging from the conveying pipe 33 to the inlet area can flow back. Cap 35 is suitably one of several circumferentially distributed supports 37 in the funnel section 26 of the housing 25 of the removal device 23 held. About not shown Support webs or the like, the conveyor pipe 33 of the conveyor 30 be supported in the cap 35.

As shown in Figure 4, the air supply lance 17 comprises a tube 42 with an air permeable Wall, which is preferably made of a porous sintered material is made. The tube 42 is at its front end, on the left in FIG. 4 closed with a cap 43, which is airtight or also made of air-permeable Sintered material can be made. With accordingly Rigid construction of the tube 42 can this directly in the sintered material introduce. However, it is preferred if the tube 42 is more permeable to air Wall is arranged in a support frame 44, which in particular from helical webs 55 and circumferentially extending circumferential webs 46 is formed. To the support frame 44 with the pipe 42 arranged therein with an air-permeable wall in one of the Fastening the holding sleeves 41 is a sealing sleeve 4 7 on the one in FIG. 4 right rear end of the air supply lance 17 is provided, at which a radial Support flange 48 is attached with handles 49. On the support flange is also a connection piece 50 for a compressed air supply line 51 (see Figure 2) attached.

When the air supply lance 47 is inserted, the support frame 44 breaks the solidified one Bulk material and improves the penetration of air from the pipe 42 into the bulk material.

To support the insertion of the air supply lance 17 into the bulk material. a drilling thread 52 is attached to the front end of the support frame.

As shown in Figure 7, the box-shaped transport container, ie the Sea container 10, several in the area of the removable rear wall (door) spaced-apart cross struts 53 on which the rear Track of the liner 11 held by means of tabs or loops 54 is.

As shown in Figures 1 and 7, there is a hose 55 with an outlet opening 56 of the liner 11 connected by the outlet opening 56 across the top panel of the liner to the area of the removable Container rear wall or door is guided. During transportation the free end 57 of the hose 55 is tightly closed.

The following is the handling and operation of the invention Systems for removing bulk goods from a container, using the example of a sea container 10 described.

After the sea container 10, which in the manner described with a Lining 11 is lined and in which a poorly flowing Bulk material, for example kieselguhr, has arrived at the unloading point the back wall or door of the sea container 10 open. Then the adapter frame 18 on the frame of the rear Opening or door of the sea container 10 attached, as shown in Figure 7 is.

After the adapter frame 18 is attached to the sea container 10, are the sealing sleeves 15 of the air supply areas 16 through the holding sleeves 21 pulled outwards. In a similar way also the sealing sleeve 14 of the outlet area 13 through the lead frame 22 pulled through for the removal devices 23. Be there first the removal devices 23 attached. As shown in Figure 7 is. are across the bottom width of the rear opening of the sea container 10 two removal devices 23 arranged. However, it is also conceivable, depending on the design of the extraction devices and the width of the unloading container to attach other removal devices so that them with respect to the direction of discharge of the bulk material from the container and are arranged side by side with respect to gravity.

After the removal devices 23 have been attached, the rear web can the lining 11 can be cut out. For this is in the transition section 27 of the housing 25 of the removal devices 23 a corresponding not shown with a lid tightly closable Luke provided.

So after the removal devices 23 on the lead frame 22 of the adapter frame 18 are attached, are not yet in the outlet area 13th cut back sheet on the air supply lances 17 compressed air lines 51 connected to the air supply lances 17 with the connecting piece 19 'to connect the pressure chamber 19. Then be the air supply lances 17 are pressurized with compressed air and, as in 6, one after the other through the sealing sleeves 15 the air supply areas 16 and through the holding sleeves 21 on the adapter frame 18 passed through. With the drilling thread 52 pierce the Air supply lances 17 penetrate the rear panel of the liner 11 and in the bulk material. Here, each air supply lance 17 by means of the Handles 49 or using a drill or the like are rotated about their longitudinal axis so that the drilling thread 52 screwed or drilled into the bulk material, the bulk material already is loosened and fluidized.

Because the bulk solidified in the container after transport. becomes air is first introduced into the bulk material in the container, so that it is sufficiently fluidized. The air is introduced over the air-permeable walls of the tubes 42 of the air supply lances 17, which are introduced into a region in the bulk material which is the outlet region 13 is adjacent. While through the air supply lances 17 under one Compressed air at low overpressure is introduced into the bulk material becomes. through the hose 55 excess air from the lining 11 drained. To prevent the discharge of dusty bulk material in To prevent the environment, the free end 57 of the hose 55 to one suitable filter device connected, which makes it possible at the same time. determine how much dusty bulk material from the by the Hose 55 escaping air is carried. The share of carried Bulk goods serve as an indicator of how far the bulk goods are in Transport container is already fluidized.

During fluidization or after sufficient fluidization has been achieved then the rear panel of the liner 11 in the outlet area cut out. Now the conveyor 30 can Tapping devices 23 put into operation and the suction devices 39 be switched on. At this time, the bypass valves 41 opened so that the delivery line 40 from the suction device 39 air sucked out practically completely through the secondary air valves 41 supplied secondary air is. The system is designed for the removal of bulk goods ready for the sea container.

As soon as the bulk material in the transport container in particular adjacent to Outlet area 13 is sufficiently fluidized, flows or slides bulk material due to gravity in the funnel section 26 of the housing 25 of the Removal devices 23. There, the bulk material from the screw conveyor 32 of the conveying device 30 and in the direction of the discharge area 38 funded. The flow of bulk material into the conveyor becomes possibly supported by the stirring device 34. That from the top Bulk material emerging from the end of the conveying pipe 33 flows through the annular space 36 back into the inlet area of the conveyor 30, whereby there is a bulk material circulation that ensures that the bulk material remains in a fluidized state suitable for suction.

The secondary air supply is now throttled via the adjustable secondary air valve 41, so that bulk material with leading air is sucked out of the container becomes. A negative pressure thus arises in the removal device 23 the fluidized or dusty bulk air leading out of the cladding sucked into the removal device 23 in the container and on to Discharge of bulk goods is sucked out of the transport container.

Depending on the degree of fluidization of the bulk material that has already been achieved the secondary air valve 41 are closed more or less, so the Discharge capacity of bulk goods to the fluidization state of the bulk goods to adjust in the container. To create a vacuum inside the liner To prevent 11, the air supply must be adapted to the air extraction must be, especially when the secondary air valve is completely closed 41 the compressed air supply through the air supply lances 17 practical be equal to the air extraction for the removal of bulk goods.

After a sufficient fluidization state of the bulk material in the container is reached, the container to be unloaded, for example the Sea container 10 located on a truck into a container shown in FIG Tilt raised to allow bulk material to flow to the outlet area 13. So to support the tapping devices 23. Get there bulk material not yet fluidized into the area of the air supply lances, see above it is broken open at these and fluidized by the penetrating air.

The air supply lances 17 used to fluidize the bulk material with which the compressed air is introduced directly into the bulk material are in described embodiment arranged parallel to each other and penetrate equally deep into the interior of the container. However, it is also conceivable that, for example, the two outer air supply lances longer than the two inner ones are formed and / or at a flatter angle be pushed into the bulk material inside the container.

The present invention thus makes it possible for bulk materials to flow poorly to be able to extract from a transport container even if the bulk material is very strongly solidified as a result of the transport. since that Bulk goods with the help of an additional air supply device in front of the Outlet area of the container is fluidized.

Claims (11)

1. A system for the removal of bulk material from a container, in particular a box-shaped transport container comprising a removal instrument (23) that can be attached to an outlet area of the container (10) and that has a conveyance device (30) to convey bulk material flowing out of the container (10) into the removal instrument (23) substantially against its direction of outflow out of the container (10) to a discharge area (38) of the removal instrument (23) to which an off-suctioning device (39) is connectable, characterized in that an air supply device (17, 19, 20') is provided in order to be able to pipe air directly into the interior of the bulk material in the container (10) for purposes of fluidization to thereby loosen up the bulk material from the inside.
2. A system according to claim 1, characterized in that the air supply device (17, 19, 20') comprises at least one pipe (42) with an air-permeable wall that can be connected to a pressure source and can be attached in a container area located in front of the outlet area, said pipe (42) with the air-permeable wall being preferably made of a porous sinter material.
3. A system according to claim 2, characterized in that the pipe (42) with the air-permeable wall is arranged in a substantially cylindrical support frame (44) made of longitudinal and circumferential bridges (45 and 46, respectively) whose longitudinal bridges (45) substantially run around the pipe (42) with the air-permeable wall in a spiral manner, a borehole threading (52) being preferably arranged on the end of the pipe (42) with the air-permeable wall that is to be disposed in the container (10).
4. A system according to claim 2 or 3, characterized in that the air supply device comprises a plurality of pipes (42) with air-permeable walls, said pipes (42) which preferably are substantially equally long and provided each in a supporting frame (44) being attachable mutually parallel in the container (10).
5. A system according to claims 2 to 4, characterized in that attached to each pipe (42) in the area of its end that can be connected to the compressed air source (20'), there is a sleeve (47) by means of which the pipe (42) can be fastened in a retaining sleeve (21) provided on an adaptor frame (18) that can be attached to the container (10), a collecting pressure chamber (19) connectable to the compressed air source (20') being provided in particular on the adaptor frame (18), and each pipe (42) with the air-permeable wall being connectable to the collecting pressure chamber (19), preferably by means of a pressure line (51).
6. A system according to any of the preceding claims, characterized in that the container (10) has a lining consisting of flexible air-impermeable material in which the bulk material is received, in particular, during shipment in a manner protected against environmental factors, in which in particular the lining (11) has an air supply area (16) that can be cut up or cut out, and are initially tightly closed and surrounded by an outwardly extending flexible sealing cuff (15), whereas the lining (11) suitably has an initially tightly closed outlet area (13) for bulk material surrounded by an outwardly extending flexible sealing cuff (14) and can be cut up or cut out for opening purposes, and in which the lining in an area remote from the outlet area (13) for bulk material has an air outlet (56) upon which adjoins an outwardly located hose (55) whose free end (57) can be tightly closed.
7. A system according to any of the preceding claims, characterized in that at least two removal instruments (23) are provided which, both regarding the outflow direction of the bulk material and regarding the force of gravity, are attached next to each other upon the outlet area of the container (10), each removal instrument (23) having its own funnel segment (26) in which is arranged the particular conveyance device (30) with its conveyance direction placed substantially coaxially with respect to the funnel axis, and in which each removal instrument (23) can be attached to the container (10) by means of an adaptor frame (18).
8. A process for the removal of bulk material from a container, in particular, from a box-shaped transport container, wherein

   a removal instrument (23) is attached to an outlet area of the container (10),

   bulk material in the removal instrument (23) is substantially conveyed contrary to its direction of outflow out of the container (10) into a discharge area (38) of the removal instrument (23), and

   bulk material is suctioned out of the discharge area (38),

   characterized in that

   air is piped directly into the interior of the bulk material located in the container (10) such that the bulk material is fluidized from the inside.
9. A process according to claim 8, characterized in that the air for fluidizing the bulk material is piped into the bulk material in a container area that is in front of the outlet area, and the air for fluidizing the bulk material is injected into the bulk material, preferably by means of one or several pipes (42) each having an air-permeable wall, said several pipes (42) for injecting air into the bulk material being substantially equally long and arranged parallel to each other, and preferably supplied with compressed air from a common compressed air source (20') via a collecting pressure chamber (19).
10. A process according to claim 8 or 9, characterized in that at least two removal instruments (23), both as regards the direction of outflow of the bulk material and as regards the force of gravity, are attached next to each other on the outlet area of the container (10), that air can be supplied to the discharge area (38) of the removal instrument (23) via an adjustable secondary air valve (41) in order to make an independent off-suctioning air current possible, in which in particular the air supplied via the secondary air valve (41) is reduced the moment the bulk material in the container (10) has been sufficiently fluidized in order to increase the bulk material discharge.
11. A process according to claims 8 to 10, characterized in that prior to the actual removal of bulk material from the container (10), air is piped into the container (10) for the purpose of fluidizing the bulk material, whereas air escapes from that container in an area of the container (10) that is remote from the outlet area, the air escaping from the container being suitably filtered and monitored for any bulk material that is carried along.

Images