DE2341099A1 - EQUIPMENT FOR HEAT, COLD AND / OR SUBSTANCE TREATMENT - Google Patents

Description

Patent attorneys Dipl.-Ing. F. Teickmann,

Dipl.-Ing. H. Weickmann, Dipl.-Phys. Dr. K. Fincke Dipl.-Ing. F. A. Weickmann, Dipl.-Chem. B. Huber

8 MUNICH 86, DEN

PO Box 860 820

MÖHLSTRASSE 22, CALL NUMBER 98 39 21/22

Probat works by Gimborn & Co. KG-, 4240 Emmeri ch, Mennonit ens tr.

Device for heat, cold and / or material treatment

The invention relates to a device for heating, cooling and / or material treatment of a granular, free-flowing material, in particular for roasting coffee, cocoa or nuts, with a arranged with a vertical axis, tapering downwards, in which the material is a substantially upwardly directed Treatment current is exposed, the container having the shape of a bowl with in the area of the axis not or flat and has an increasingly steep inner wall with increasing distance and can be driven to rotate at such a speed, that the good under the effect of centrifugal force over the hand of the container is also promoted, while still above the container in a small distance from the dimensions of the goods A lid is arranged on the edge of the container and the lid carries arched ribs on its underside which form an arch of at least approximately 90 ° and their radially outer Ends above the edge of the container at least approximately tangentially to this run in the opposite direction to its direction of rotation and the supply of the treatment stream through a extending through the lid into the container R <5hr running coaxially to the container takes place, according to patent (Patent application P 21 03 ^ 81.5). /

In the device described in the main patent application (P 21 φ 281 ο5) "" the supply of the \ Bejaandl4ngsstromes takes place through a

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central tube, which, however, cannot be adjusted in height and therefore cannot be adapted to the operating conditions. aside from that ends this pipe with a fairly large distance above the bottom of the container, so that the falling from above is taken down by the treatment entering the container, so that here essentially a direct current principle is realized. By taking along the material that has already fallen downwards through the treatment flow directed downwards · the goods are accelerated towards the ground at increased speed.

The object of the invention is to control the circulation of the material and the intensity of the treatment of the material by the treatment flow to improve.

According to the invention, this object is achieved in that the length of the tube for introducing the treatment stream is adjustable is and extends with its lower edge to close to the bottom of the container. This arrangement of the pipe for the supply of the treatment flow, it emerges under the material that is directed downwards and deflected at the bottom of the container, so that this treatment flow forms a certain cushion for the falling material and accelerates the circulation. aside from that the incoming treatment flow crosses the circulating material layer at the lowest point of the container in the vicinity the lower end of the tube and in the area of the exit point for the treatment flow, which is usually in the cover of the container is provided .. By this crossing of the material flow through the treatment flow in the manner of a cross flow in addition to the direct current treatment taking place over a large part of the movement path of the goods in the area of the ascending trajectory, an even and intensive treatment of all good particles is achieved, partly in fluidized bed form achieved.

The device described in the main patent application (P 21 OJ> 281.5) has a cylindrical wall area

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formed lid flush with respect to the top of the container put on so that the good pushed out by centrifugal force through the gap between the container and the lid strokes and is pressed against the edge of the lid edge, causing friction losses and a precise execution of the sealing elements is required.

Avoiding these disadvantages and perfecting the solution to the problem set at the beginning, namely the upheaval to improve the material and the intensity of the treatment of the material by the treatment flow, is according to the invention achieved in that the inner diameter of the container at its upper edge is smaller than the inner diameter of the cylinder-shaped lid and that the arc-shaped ribs extending from the inner wall of the lid the overlap the step resulting from the difference in diameter, in the direction of their radially inner ends, with the inner curved surfaces inclined towards the container bottom, slightly twisted and rounded at the free ends. When the goods circulate, it jumps over the step formed in this way and is taken up by the ribs spanning the step and directed inwards, so that the hitherto existing at the sealing gap Frictional losses that occur are eliminated and a less precise design of the sealing gap is possible. There the ribs are slightly twisted and rounded at their ends, the flow of material is fanned out, creating the individual particles experience better contact with the warm air. Without the twisting of the ribs and the rounding at the end of the goods the Gutsstrom would be compact.

In the device according to the main application (P 21 03 281.5), the cooling device for the treated goods is usually arranged below the treatment tank, so that there is a large overall height. According to one embodiment of the invention

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a circular, rotatable cooling sieve is provided around the container and can be emptied with a stationary scraper. By this measure, the space requirement is limited in height to the overall height caused by the container.

A particularly favorable development of the invention consists in that the scraper by an inwardly pivotable wall section of a fixed hood surrounding the cooling sieve is formed. This also avoids any incorrect operation, since the scraper is only effective when the hood is open is.

This means that the goods falling through the cooling sieve are also complete can be discharged, there is a drip tray underneath the circular cooling sieve and one with the cooling sieve Circumferential brush for sweeping the drip tray is provided.

To remove the treated material from the container, the latter can pivot an outwardly in its cylindrical wall area Have wall section on which the ribs associated with this area are attached. This is after pivoting of the corresponding wall area of the lid, the treated material is carried to the outside due to the effect of centrifugal force.

According to another embodiment of the invention, two or more containers can be arranged on a common shaft be, whereby the treatment of the goods can take place in several stages.

In order to meet the requirements of an environmentally friendly operation, air is used for treatment of the goods in the air duct for the exhaust air from the container, a cyclone, a blower and an afterburner as well as a mixing station for part of the cleaned hot exhaust air with fresh

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air provided. In the downstream cyclone, the The exhaust air entrained particles are excreted while in the afterburner the smoke and odor-forming substances are burned. By adding the exhaust air cleaned in this way to the fresh air to be introduced into the container has a favorable effect on the heat balance.

The invention is shown in the drawing, for example. It shows:

Fig. 1 is a cross section through a coffee roaster Serving device according to the invention in connection with additional devices for the preparation of the treatment stream ;

3? Ig. 2 shows a partial section through the roasting machine iia enlarged Scale;

3 shows a section along the line III-III in FIG. 2;

Fig. 4- shows another embodiment of the device according to the invention; and

Fig. 5 shows a detail of the roasting machine.

The coffee roaster shown in Fig. 1 has a with vertical shaft 1 rotating container 2, which has the shape of a shell, namely a paraboloid of revolution, with im Area of axis 1 has no or flat and increasingly steep inner wall with increasing distance. The container 2 is driven by a geared motor 3 which is provided within a support structure 4 for supporting the shaft 1 is.

The container 2 is covered by a cover 5 with a cylindrical wall 6 covered, the lower edge of which has only a small distance from the upper edge of the container during operation. Of the The inner diameter of the container 2 is at its upper edge 7

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less than the inner diameter of the cylindrical wall of the Cover 5, so that a level 8 is created. On the underside of the cover 5, arcuate ribs 9 are provided, their course can be seen more precisely from Fig. j5. The radially outer ends of the ribs 9 are tangential to the cylindrical wall 6 of the Cover 5 and reach up to this wall so that they overlap the level 8. The due to the centrifugal force over Skip the edge 7 of the container conveyed out coffee beans the step 8 and are passed through the ribs 9 inward. The individual coffee beans can therefore not be part of the Impact the lower edge of the wall 6 of the cover 5. In the direction on the radially inner ends, the arched ribs 9 are so slightly twisted that the inner arch surfaces are inclined towards the bottom of the container. The free ends of the ribs, where the material runs inward and downward, are rounded.

The supply of the treatment stream - laier a stream of hot air - takes place through a perpendicular through the cover 5 " Tube 10 extending into the container 2 and directed downwardly inside the container coaxially to the drive shaft 3 is. In the lower area, the tube 10 is made in two parts, the second tube part, which is denoted by 11 is, engages over the first tubular part 10 and consists of an adjusting device with respect to this a bar provided with a handle 12 I3, which by a clamping device 14 clamped and from outside the Lid is operable. As a result, the lower pipe part 5 is adjustable to close to the bottom of the container 2, so that the air exits from a relatively small gap 15 and the material falling from above along the pipe, in the present case Trap coffee beans, like a cross flow interspersed. The air is directed upwards essentially in the direction of the wall of the container and passes over Openings l6 in the cover 5 in an air duct 17 for the exhaust air.

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The flow of material conveyed inward through the ribs 9 is again penetrated by the air. Part of the air flows through it the interior 18 of the container after traversing the material layer in the lower region of the container without following the material flow along the container wall. This proportion of air also traverses the inwardly directed stream of material before exiting through the openings 16.

The coffee beans to be roasted are fed in via a funnel 19 which opens into the pipe 10 and which is guided by a slide 20 can be shut off.

With a lifting cylinder 21, the container 2 can be lowered via a rod 22 and a pressure plate 23, on which the container is supported by means of a bearing 24, so that the gap between the container edge 7 and the lower edge of the lid is enlarged. From this enlarged gap, the material conveyed upward by the centrifugal force reaches a cooling screen 25, which is circular and is connected to a cylindrical wall 26 at the radially inner edge. This cylindrical wall 26 is supported by rollers 27 and is set in rotation by a motor 28 and an intermediate gear 29 after the cooling process has ended. The fixed hood 64 is sealed at its lower edge with respect to the cooling sieve by a mechanical seal, not shown. An inwardly pivotable wall section J> 0 of the fixed hood 64 serves as a scraper for the cooled goods. After being stripped off the cooling sieve, the cooled coffee beans pass into a container 31 which has a suction funnel 32 from which a riser pipe 33 extends, which conveys the cooled coffee beans to a collecting container (not shown). An annular collecting tray 34 is provided under the cooling sieve 25, onto which fine-grained material particles may fall. A brush 35 running along with the cooling sieve 25 returns these fine material particles to the container 3 ¹ ·

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The cooling takes place in that air is sucked through the cooling sieve 25 from below by a fan 65 and is sucked out of the space delimited by the hood 64 via a line J> 6 .

The exhaust air reaching the air duct 17 is sucked through a cyclone 38 by a fan 57, which discharges the solids contents via a cellular wheel 39. After the cyclone 58, the cleaned air reaches an afterburner consisting of burner 40 and combustion chamber 41, in which all fumes and odorous substances are burned at the appropriate temperature and discharged into the atmosphere via an outlet pipe 42 with a control valve hj>. A line 44 branching off from the outlet pipe 42 leads to a mixing station in which the mixing ratio between the hot exhaust air and the fresh air entering via a line 47 is adjusted via flaps 45 and 46. The air enters the pipe from this mixing station

In Fig. 4 is the arrangement of two containers in a schematic manner 48 and 49 shown on a common shaft 51, which is driven by a motor 50- After emptying the Upper container 48, the treated material passes through a chute 52 into the lower container 49, in which the treatment of the Good is continued in the second stage. The inlets for the treatment medium are 55 and 54-, while the outlets with 55 and 56 are designated.

In Fig. 5 is another emptying device in a schematic manner shown. In this embodiment, the cylindrical edge 57 of a cover on an upwardly pivotable about a pivot point 58 wall area 59, which by means of a pneumatic or hydraulic cylinder 60 is pivotable. So that the pumped up in the container due to the centrifugal force Well over the wall area 59 that has been pivoted away

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released opening 6l can escape> In this area are the arched ribs 62, which during operation the Direct circulating goods inwards on the swing-away wall area 59 attached and pivotable upwards together with this. After the wall area 59 has been pivoted up, the material emerges in the direction of the arrows 65.

- patent claims -

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Claims (8)

- 10 claims (Ji / device for heat, cold and / or substance treatment of a granular, free-flowing material, in particular for roasting coffee, cocoa or nuts, with a container arranged with a vertical axis, tapering downwards, in which the material is essentially a upward treatment flow is exposed, the container has the shape of a bowl with in the area of the axis not or flat and with increasing distance increasingly steeply rising inner wall and can be driven to rotate at such a speed that the material under the effect of centrifugal force over the edge of the container furthermore, a lid is arranged above the container at a small distance from the edge of the container compared to the dimensions of the goods and the lid carries arcuate ribs on its underside which describe an arc of at least approximately 90 ° and their radially outer ends above the edge of the container at least approximately tangential to the sem run in the opposite direction to the direction of rotation and wherein the supply of the treatment stream takes place through a through the lid through into the container extending coaxially to the container tube, according to patent. ... ... (Patent application P 21 0j5 281.5), characterized in that the tube (10, 11) for introducing the treatment stream is adjustable in its position and with its lower edge up to close to the Bottom of the container (2) is enough. 2. Device, in particular according to claim 1, characterized in that that the inner diameter of the container (2) at its upper edge (7) is smaller than the inner diameter of the cylindrical formed cover (5) and that from the inner wall (6) of the cover (5) extending arcuate ribs (9) the from the diameter difference resulting step (8) overlap, in the direction of their radially inner ends, with the inner arcuate surfaces inclined towards the bottom of the container, slightly twisted and are rounded at the free ends. - 11 - 50 ^ 808/0644 3. Device according to claim 1 or 2, characterized in that a circular ring-shaped rotatable around the container (2) Cooling sieve (25) is provided and can be emptied with a fixed scraper. 4. Device according to claim 3 _5, characterized in that the scraper is formed by an inwardly pivotable wall section (30) of a fixed hood (64) surrounding the cooling screen (25). 5. Device according to claim 3 or 4, characterized in that that below the annular cooling sieve (25) a collecting tray (34-) and one with the cooling sieve (25) surrounding it Brushes (35) are provided for sweeping the drip tray. 6. Device according to one of claims 1 to 5 »characterized in that the cover in its cylindrical wall area (57) has an outwardly pivotable wall section (59) on which the ribs (62) assigned to this area are attached, 7. Device according to one of the preceding claims, characterized in that two on a common shaft (51) or several containers (48, 49) are arranged. 8. Device according to one of the preceding claims, characterized characterized in that when using air to treat the material in the air duct (17) for the exhaust air from the Container (2) a cyclone (38) a fan (37) and an afterburner (40, 41) and a mixing station (45, 46) for one part the cleaned hot exhaust air with fresh air are provided. 50 9808/0644 Lee. r side