DE10107277A1 - Non-dusting rotary batch dryer for fine, sensitive bulk chemical or pharmaceutical powders, is designed with connections for closed operation - Google Patents

Abstract

Material being dried is held in volumes so connected during filling and emptying of the dryer (11), that they remain closed against the surroundings. The dryer opening connection (17) joins with those (34, 22) of the dispenser container (1) and the receiver container (23) respectively. Preferred Features: The dispenser includes an emptying device with an outlet hopper and a conical closure (3) moving axially in a cylindrical guide, supported by braces on the outlet funnel. The conical closure is spring-loaded into the closure against the inner wall of the outlet hopper (34). It is raised pneumatically, the cylinder being integrated into a drop tube (6). A safety cover (2) is fitted to the dispenser connection (34). The charging station (A) has a pivoting unit (5) to remove the cover. The charging station includes a weigher (9). The dryer has a centering unit (31, 32, 33) for vertical alignment. This includes a vertically-moving cam follower, with slide ways fastened to the dryer rotary axis, centered by the cam follower roller. The dispenser also has flaps. Compensation bellows (8) bridge the dryer/dispenser connection. Active or passive flaps are included.

Description

The invention relates to drying plant for the treatment of sensitive bulk goods, consisting of at least one loading station, one drying station a dryer rotatable about a horizontal axis, and an emptying station which are arranged one above the other, the loading station and the emptying station Means for receiving movable dispenser containers and recipient containers point.

It is basically known drum dryer for drying chemical Products. It is also known for the recording and the Transport of the dried bulk goods from drying plants to containers put. A special container is from the published patent application EP 0 680 897 A1 known. This describes a bulk container with a special emptier Facility. Special measures, such as product contamination of the environment be avoided when connecting drying systems with bulk containers can not be known.

The object of the invention is to provide a drying system which the after avoids parts of the drying plants known from the prior art and loading and emptying without product contamination of the environment prevents.

The object is achieved in that a drying device of the type mentioned above with a loading station and an emptier station that the material to be dried is treated in all stages of treatment by the Environment remains closed.

The invention relates to a drying system for batch drying sensitive bulk goods, at least having a loading station, a  Dryer station with a dryer which can be rotated about a horizontal axis, and Emptying station, which are arranged one above the other, the loading station and the emptying station means or for receiving movable dispenser containers and Have receiver container, characterized in that the opening nozzle the dryer with the connection of the dispenser container and with the connection of the Receiver container is connectable so that the material to be dried when filling and The dryer remains empty in rooms that are isolated from the surroundings.

A drying system is preferred in which the dispenser container empties direction with an outlet funnel and a conical closure member, which is axially displaceable in a cylindrical guide that struts at the end funnel is supported, is mounted, the closure member by spring effect against the inner wall of the discharge funnel in the closed position and for lifting in the outlet position from a, especially pneumatic, lifting unit direction (preferably integrated in the downpipe) can be acted upon.

A drying system in which the dispenser container is attached is particularly preferred its connection has a safety cover and the loading station one Has pivoting device for removing the lid. This is an additional protection of the environment during transport and manual intervention superfluous when loading the system.

In a particularly preferred further variant of the drying plant, the Be loading station equipped with a weighing device for the throughput and if necessary to be able to determine the degree of drying.

In a preferred design, drying has proven to be particularly advantageous installation of a centering device for the vertical centered Alignment of the dryer proved a faster and more secure connection the container for filling or emptying the dryer becomes possible.  

The centering device particularly preferably comprises a vertically movable device Cam roller and two, in particular by 180 ° offset key plates, which on the Axis of rotation of the dryer are attached and in the cam roller for centering intervenes.

To improve the avoidance of product contamination, the dispenser container is in a further preferred variant of the invention with divided by the axis of rotation Provide flap wings.

To bridge the stroke between the connections of the dryer and the In a preferred variant of the drying system, the dispenser container is between the dryer and the dispenser container a compensator to bridge the Stroke between the connections of the dryer and the dispenser container assigns.

The connection between the compensator and the dryer nozzle and / or can exist between the dryer neck and the neck of the receiver container preferably also via a pair of active flap part and passive flap part respectively. This further serves to rule out product contamination of the um gebung.

Another object of the invention is the use of the invention Drying plant and its preferred embodiments for drying sensitive dry goods, especially fine chemical or pharmaceutical zeutische products.

The invention is explained below with reference to the figures by the example which but does not constitute a limitation of the invention, explained in more detail.  

Show it:

Fig. 1 shows a cross section through the drying system according to the invention with loading station (A), dryer station (B) and emptying station (C) in the drying operation

FIG. 2 shows a detail from FIG. 1 in the operating state of loading the dryer 11

Fig. 3 shows a detail from Fig. 1 in the operating state of the emptying of the dryer 11

Fig. 4 shows a detail from Fig. 3 with a view of the centering device

example

The loading and emptying of a rotating double-cone dryer in a closed system is described below by way of example; the dispenser 1 and receiver container 23 are mentioned as examples as containers (cf. FIG. 1).

The drying system is equipped with the assembly station A, dryer B and emptying station C.

The dryer 11 is additionally equipped with a pre-adjustment 14 , with a “torsionally flexible coupling” 12, with a centering device 15 , consisting of two keyway plates 32 , 33 attached to the dryer container offset by 180 ° and a stationary unit with a cam roller guided on a pivoting lever 30 31 , and with a 4-channel coupling 13 , consisting of a stationary primary part and two secondary parts attached to the dryer container offset by 180 °.

Depending on requirements, the cam roller 31 of the centering device 15 is pressed into one of the two keyway plates 32 or 33 as far as it will go and centers the dryer container 11 repeatedly in the loading or emptying position, while the torsionally flexible coupling 12 detects the relative rotary movement resulting from the centering when it is stationary Drive enables. The 4-channel coupling transmits the required kinetic energy.

Thus, the exact alignment of the dryer container 11 is possible as a condition for the connection of the container 11 with the loading and the Entleerein direction respectively to closed systems, FIG. 2 and FIG. 3.

Product contamination is avoided by using flaps with flap wings divided by the axis of rotation and an emptying device for bulk goods containers according to EP 0 680 897 A1. The emptying closure is additionally equipped with a cover 2 for the road transport of the container.

The dryer loading device consists of the emptying station 7 with a weighing device 9 for emptying containers 1 with a conical closure member 3 , from a lifting / swiveling arm 5 for the disassembly / assembly of the container lid 2 and for the sealing of the downpipe 6 . Lifting device 4 with compensator 8 , from the lifting device 10 with part of the split flap 18 a (an active flap part, with drives for the flap halves locking and the flap actuation). The other flap part 18 b (passive flap part) is mounted on the loading / emptying nozzle 17 and rotates with the dryer container 11 during drying.

This enables the loading of a mobile dryer according to the principle of one "Closed facility".

To load the dryer, the dryer container 11 is moved with the passive flap part 18 b into the upper position (loading position) and aligned. Alignment is as described above. The stationary active flap part 18 a is lowered with the lifting device 10 to the passive flap part 18 b. After locking the parts 18 a + 18b, both flap wings form a unit for opening and closing the connection. The areas that are open (possibly contaminated) before the two flap halves meet cover each other when locked and do not come into contact with the product. During the loading process, the flameproof apparatus flap 16 is opened first and then the flap pair 18 a / b.

The container 1 is placed on a transport means 35 on the emptying station 7 , positioned and secured. With the swivel arm 5 , the blind cover 2 at the container outlet 34 is removed and swiveled out of the docking area. The downpipe 6 is pressed against the container outlet 34 and sealed. The compensator 8 bridges the stroke. To empty the container 1 , the container closure 3 is opened indirectly by the emptying station 7 . The container closure 3 consists of a guided cone, the lifting height of which is variable and can pulsate in the open positions (in order to break material bridges). Vibrators are optionally installed on the emptying station frame 7 and on the downpipe 6 as additional discharge aids. The areas open (possibly contaminated) before the container closure 3 meets the emptying station cover each other when docked and likewise do not come into contact with the product.

After the dryer loading process, the valve parts 18 a / 18 b and the dryer valve 16 are closed in the order. Then the docking system 10 is docked free. After deactivating the pre-adjustment 14 , centering device 15 , and 4-channel coupling 13 , the dryer can be rotated by means of drive 12 and the material to be dried can be dried. To remove the emptied container, the container closure 3 is closed and then the downpipe 6 is undocked. The swivel arm swivels in under the container and additionally closes the container outlet 34 with the blind cover 2 , immediately afterwards the swivel arm 5 lowers down to the chute 6 and seals it in addition to the integrated chute closure. After the container lock is activated, the container 1 can be removed from the emptying station 7 .

The dryer emptying station C consists of the container receiving device 24 , the container adjusting device 25 , the stationary docking station, consisting of two lifting devices 20 , 21 , each with an active part of the divided flaps 19 a / 22 a. The passive part 18 b as a partner of the upper active part 19 a is mounted on the loading / unloading nozzle 17 of the dryer container. The passive part 22 b as a partner of the lower active part 22 a is mounted on the container filler neck.

This also enables the rotating dryer to be emptied according to the principle of one "Closed facility".  

To empty the dryer from the dried goods, the dryer container with the passive flap part 18 b is turned into the lower position (emptying position) and aligned. The alignment takes place in the same way as the alignment described above for filling. The container 23 for receiving the dried product is placed on the container receptacle 24 with a means of transport and aligned with the adjusting device 25 . The active flap part 19 a is raised and locked with the upper lifting device up to the passive flap part 18 b of the dryer container, the active flap part 22 a of the lower lifting device is lowered and locked up to the passive flap part 22 b of the container 23 . After the locking operations, the flap wing pairs 19 a / 18 b and 22 a / 22 b each form a unit for opening and closing. The open (possibly contaminated) halves before the flaps meet cover each other in the locked state and do not come into contact with the product. When emptying the flaps 19 a / 18 b and 22 a / 22 b and then the flameproof apparatus flap 16 are opened.

After the dryer emptying process, the dryer fitting 16 is first closed, then the flaps 19 a / 18 b and 22 a / 22 b are closed. Then the upper and lower lifting devices are docked free. The filled container 23 is now free and can be removed. After deactivating the pre-adjustment 14 , the centering device 15 , and the 4-channel coupling 13 , the dryer can be rotated, for. B. in the filling position.

Claims (10)

1. Drying system for batch-wise drying of sensitive bulk goods, at least comprising a loading station (A), a dryer station (B) with a dryer ( 11 ) rotatable about a horizontal axis, and an emptying station (C) which are arranged one above the other, the loading station (A) and the emptying station (C) means ( 7 ) or ( 24 ) for receiving movable dispenser containers ( 1 ) and recipient containers ( 23 ), characterized in that the opening nozzle ( 17 ) of the dryer ( 11 ) with the connection ( 34 ) of the dispenser container ( 1 ) and can be connected to the connection ( 22 ) of the recipient container ( 23 ) in such a way that the material to be dried remains in the rooms closed off from the environment when the dryer ( 11 ) is being filled and emptied. 2. Drying system according to claim 1, characterized in that the dispenser container ( 1 ) is an emptying device with an outlet funnel and a conical closure member ( 3 ) which is axially displaceably mounted in a cylindrical guide which is supported by struts on the outlet funnel, the Closure member ( 3 ) is held in the closed position by spring action against the inner wall of the outlet funnel ( 34 ) and can be acted upon by a particularly pneumatic lifting device (integrated in the downpipe ( 6 )) for lifting in the outlet position. Having 3. Drying machine according to claim 1 or 2, characterized in that the dispensing container (1) at its terminal (34) has a securing lid (2) and that the feed station (A) a pivoting device (5) for removing the lid (2) , 4. Drying system according to one of claims 1 to 3, characterized in that the loading station (A) has a weighing device ( 9 ). 5. Drying system according to one of claims 1 to 4, characterized in that the dryer ( 11 ) has a centering device ( 31 ; 32 ; 33 ) for the vertical centered alignment of the dryer ( 11 ). 6. Drying system according to claim 5, characterized in that the centering device consists of a vertically movable cam roller ( 31 ) and two, in particular 180 ° offset key plates ( 32 , 33 ) which are attached to the axis of rotation of the dryer ( 11 ) and in the cam roller ( 31 ) engages for centering. 7. Drying system according to one of claims 1 to 6, characterized in that the dispenser container ( 1 ) is provided with flap wings divided by the axis of rotation. 8. Drying system according to one of claims 1 to 7, characterized in that between the dryer ( 11 ) and the dispenser container ( 1 ), a compensator ( 8 ) for bridging the stroke between the connections ( 17 ) and ( 34 ) of the dryer ( 11 ) and the dispenser container ( 1 ) is arranged. 9. Drying system according to one of claims 1 to 8, characterized in that the connection between the compensator ( 8 ) and the dryer nozzle ( 17 ) and / or between the dryer nozzle ( 17 ) and the nozzle of the receiver container ( 23 ) via a pair of active flap part ( 18 a) or ( 19 a) and passive flap part ( 18 b). 10. Use of the drying plant according to one of claims 1 to 6 for Drying sensitive dry goods, especially fine particles chemical or pharmaceutical products.