DE1803370A1 - Method and device for the treatment of vegetables - Google Patents

Description

PATENT ADVERTISERS \:. \ /.:

DR. ING. A. VAN DERWERTH DR. FRANZ LEDERER

21 HAMBURG 90 8 MUNICH

WILSTORFER STR. SS - TEL. 104 III "70β6Ι LUCIIE-OHAHN-8T". IJ - TtL. 10 til 440 * 46

Munich, October 11 , 1968

Applicant: UHILEVTiH HV '

Museumparlc 1, Rotterdam, Netherlands

"Process and device for the treatment of vegetables *

The invention relates to a method for treating products, especially vegetables, by which they are exposed to the influence of a gas stream which moves along these products in a rotating drum provided for this purpose, in which the products move in a certain direction under the influence of gravity move.

The invention also relates to an apparatus for carrying out this method, which is an in sohräger Position rotatably arranged and accessible from both sides drum includes which with protruding Divide is sifting, with a filling opening for the products to be treated at the highest end of the drum and an outlet opening for the treated products are provided at the other end, as well as means for forcing a gas flow through the drum conduct.

909822/0110 " ² "

BATH ORIGINAL

The object of the invention is to create a effective method, by means of which the Irseugnlaee treated is repeatedly subjected to an oaaatrom », weloher, also under the linfIu8 of the rotating drum, on daa au treatment brseugnle, the unwanted files (outer leaves, sehelen) and other impurities the respective successes both separate and auoh dissipates.

According to the invention, the object is achieved in such a way that, through walls and protrusions in the drum, the products are repeatedly exposed to free fall and thus to continuous shifting, while at the same time they are in constant contact with an oppositely directed gas flow, The preferred embodiment of the method according to the invention consists in that the drum is arranged in a position and the walls or projections are arranged in such a way that the products are continuously distributed in a channel inside the drum, sV; ■ · 'which is traversed by the gas stream .; This ensures that during the V erteil ens of ¹ to be treated BrZeUg- S / sneezing these both transversely through the gas flow f .- ^ are SiOH and AUOH bend in a direction which is V ^ suitable for emptying the products treated. ^?:; ^

The most advantageous results are achieved with the method according to the invention, however, if walls are attached are ordered, wtloho open chambers inside the Form drum, in such a way that by rotation the drum the products in the axial direction of the drum wander from chamber to chamber *

809822/0110

BAD ORfGfMAL

It has been shown that a stream of air is most suitable for carrying out the method according to the invention.

A device for carrying out the method according to the invention consists in that the parts protruding from the inner wall form a number of open chambers which leave a channel in the drum through which a gas stream can be guided from the lower end to the upper end of the drum. If one divides the interior of the drum in a number of open compartments, so it can not immediately move to the discharge port at the lower end of the drum the product to be treated, the chamber forming protrusions are preferably made of one or more vertical walls or ribs extending in the longitudinal direction Drum extend, these longitudinal ribs intersecting one or more annular walls. During the rotation of the drum, the longitudinal ribs, in cooperation with the annular walls, ensure that the products to be treated repeatedly pass through the highest area of the drum.

In a preferred embodiment of the device according to the invention, the annular walls are each formed by the surface of a truncated cone such that the tangent in the lower portion of the Area of free fall of the expanding product essentially in the plane of the conical Surface lies. This measure ensures that the annular walls lie in or parallel to the direction of distribution of the product to be treated, whereby an undesired impact of the product

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while on the hard edges of the ringfuralgan unde dee Valla dea ISrseugniases vow »upper area of the from- ■ el SOB lower area is prevented ·

In a further embodiment of the device, which is part of the gate, the ring-shaped walls are formed by the surface of a truncated cone, ie the base angle la weeentliohen equal to the angle of inclination of the Troamel iet.

H-

Bai a preferred type of construction of the device are the iftngsrlppen inclined towards the wall of the drum in the direction of rotation of the Triwal. This Malnähme «shares Eioher that there should be no need for treatment Area in which T11-1I is moved along where eioh a berry effect dea Gaeetroe.ee due to the length ran free ropes daa Bnsengniaaea results

TBLm Torriohtung is characterized according to a further pre-referenced Aueftthrangefora in that the ring-shaped would find the inner wall of the Troaeel la a ΑηκβηΊ equal Xaaaiern subdivide. the height of the conical surface formed by each ring-shaped wall and the side spacing between two successive ring-shaped fungicides is chosen such that when the troeel is inclined, the perpendicular touching the inner edge of a wall represents the lower wall within the abatandea of this wall crossed to the nlohatan wall. Daa causes the Vraeugnia iaeier falling from the upper section bub lower section of the Tronoael to hit the next ring-shaped wall.

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BATH

Another advantageous feature is that the gas flow best suited for the treatment is obtained by passing the gaseous medium through a honeycomb grid located at the lower end of the drum and through a diffuser located behind this grid This ensures that the gas flow is balanced out so that the velocity of the gas flow * has an essentially constant value over the entire cross-section of the channel in the drum invariably a constant path of the falling i

loin product guaranteed, which prevents that the product is returned to the same compartment

falls. -

On the basis of the following description of the embodiment of the "invention shown in the drawing \"

this explained in more detail. j

"It shows:. Ι

^.! Figure 1 to show a side view of a preferred embodiment of the device according to the invention, wherein '(a portion cut away of the drum, the interior of the ^drum:

FIG. 2 shows a cross section through the drum and its drive device along the line II-II in FIG Fig. 1, and

Pig. 3 is a partial view of the inner wall of the drum.

The drum 1 shown in Fig. 1 is rotatably mounted on support rollers 2, which on both sides of the drum are arranged, with each pair of these rollers on

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ORIGINAL INSPECTED

each side by * j rotatably mounted in bearing housings 4 Shafts 3 connected 1st. One of the shafts 3 is driven by a drive belt or a chain 5 by a motor 6 driven »which is arranged on a bearing block 7» which forms part of a support frame 8. the Drum 1 is on this support frame 6 at an angle ▼ on 1 $ ° inclined to the horizontal » it has no end walls and actually corresponds to an open pipe. A collar 9 is placed on the outer wall of the drum 1 on which a support roller

10 can run freely. Am axially directed fan

11 is arranged adjacent to the lower end of the drum 1 to force a stream of air through the drum. Behind the outlet opening of the fan 11, a throttle valve 12, a honeycomb-like grille 13 and a diffuser 14 are arranged in succession, where the diffuser is a unit with an annular; Coat 15 forms. The diffuser opens freely into the rotatable Drum. The higher end of the drum carries a chamber 16 which is used to fill the products to be treated serves. The chamber 16 is in one piece with an air outlet closed by a perforated plate 17 18 and an outlet connection 19 connected »with these Combination completes the drum 1. A handle of the perforated plate 17 is designated Mi £ 20. An outlet connection 21 is provided at the lower end of the drum. A number of annular parts - and although seven of them in a preferred embodiment - are fixed with their outer edges parallel to connected to each other and at right angles to the drum axis with the inner wall of the drum and thereby form annular walls 22 within the drum »wherein the

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ORlGiNAL! NSPECTED

Wine

inner edges 23 of the walls 22 leave an open Kcjnal 24 within the drum. These annular jacks 22 are equidistant from each other and each wall has the shape of a truncated cone surface with a. Base angle of 15 °, ie an angle which is equal to the angle of inclination of the drum t ι your number of longitudinal rib ?! 25 - at the gestured AusiUhrungsfora twelve an der Äahl - are firm HIfIgT fi ^w # ^T * your mu gn flrfr nten mitdeV inside * connected to the drum and extend the filling end of the drum to the last ring-shaped wall at the lower end of the drum, so that all winches 22 are opened by the longer ribs 25. As a result of this construction, the inside of the drum is divided like a network into open chambers. The longitudinal ribs 25 are ^{inclined at an angle of 31 o} to the drum wall, specifically in a wire lug of the drum.

The operation of the gate device according to the invention is as follows 5

The drum 1 is rotated by the motor 6 offset, with the rotary movement on vleii revolutions per minute is set. The fan, i | j, simultaneously pushes a stream of air from the lower to the upper volume Drum. The air flow moves through the channel 24, which is formed by the annular walls 22. The air speed can be adjusted by means of the adjustable throttle valve 22 einregulipart. will. Due to the high speed of the G fan blades of the fan 11 and the influence of the throttle valve 12, the air flow is in a very high state high turbulence. Pur the purpose of the device according to the invention underlying purpose, i.e. the to

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ORIGiMAL iN'SPiCTcD

to repeatedly expose the treated products to the air flow, during which treatment they also move in the direction of the outlet opening proved to be desirable, the speed of the air flow, measured over the cross-section of the channel 24, as constant as possible. This condition is met by the fact that a honeycomb-like grid 13 is used with the diffuser 14 placed behind it, whereby the swirling air flow is uniform will. The aerodynamic properties become at the same time so improved by the action of the honeycomb grid 13 that no backflow along the "wall" of the open channel 24 can occur, whereby the Venturi effect is avoided. This doesn't make any special Arrangement required to avoid air loss between the diffuser 14 and the rotating drum 1 to prevent. The product to be treated, for example Harvested and pruned Brussels sprouts are placed near the top of the drum 1 over the feed chamber 16 introduced into the interior of the drum 1. During the filling process, the Brussels sprouts come in immediately Contact with the flow of air, thereby blowing off minor contaminants and taking the flow of air through the air outlet 18 and the perforated plate 17 escapes, while the smaller impurities emerge through the outlet connection 19. The Brussels sprouts and the coarser contaminants, including the outer leaves, fall to the "bottom" of the drum and become close to a point during the rotary movement of the drum through one of the inclined longitudinal ribs 25 raised to the highest point of the drum and then fall under the influence of free fall. Due to the

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Arrangement of the annular walls 22 as well as the shape and the inclination of the drum, meets the trousers after his free fall behind the nearest wall. The cabbage is then in turn passed through one of the longitudinal ribs 25 raised and the movement is repeated. It can be seen that the Brussels sprouts and their outer leaves, which are loosened by the fall, are repeatedly exposed to the air flow, causing the leaves be conveyed in the direction of the outlet connection 19. After a short time the treatment of the Brussels sprouts has become designed so that he in its direction of movement from the higher to the lower end of the drum in a delayed movement against the airflow, during which movement both the airflow and the Rolling of the Brussels sprouts on top of each other and along the inner wall of the drum and along the chambers forming walls ensures that there are completely cleaned Brussels sprouts buds at the bottom of the drum exit via the outlet connection 21.

When describing the drum it was already noted that the annular walls 22 each have the shape of a Have a truncated cone with a base angle of 15 °. This particular shape of the annular walls is necessary to prevent that to be cleaned Product hits the sharp inner edges 23 of the walls 22 at the end of the free fall. It must have a certain relationship between the height of the conical surface, which of each annular Wall is formed and there is a minimum distance between two successive annular walls, because for the drum to work properly it is necessary that the products fall freely

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which fall down in front of the next annular wall. Accordingly, it would be wrong for a chamber to be left out of the proceedings, or if that Product would remain permanently in the chambers of the same ring. This condition can only be met by this be that the inner edge 23 of a wall 22 touching perpendicular the lower wall of the drum Crosses within the distance between this wall and the next.

The most advantageous "results" with the device according to the invention are achieved when this is taken care of becomes that the filling speed of the product and the filling amount of the product are so uniform as is possible. It is known per se that a rotating drum is an unevenly non-flowing one Amount influenced in such a way that at the outlet end there is an even outflow, which also applies to the The device according to the invention applies.

Although the device described is particularly suitable for cleaning Brussels sprouts _r; Tests have shown that it is also excellently suited for cleaning other types of vegetables, both in the dry and in the wet state, such as for example for peas, various types of beans and pre-cut charcoal

The device according to the invention can of course with a known device for sizing of the treated products are combined. This sizing can also be effected by making perforations of various dimensions in the

909822/0110

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End of the drum ^ andung behind the last ring-shaped Wall at the nteran end of the drum.

Patent claims:

909822/01 10

Claims (1)

ill Patent claims * Which extends along these products move in a created for this purpose rotating drum in which the products move 1. A method for treatment of products, Jfr particular vegetables, by which they are exposed to a gas stream the influence in a certain direction under the influence of gravity , characterized in that through walls or projections (22,25) in the drum (1) the products are repeatedly exposed to free fall and thus a continuous rearrangement, while at the same time they are in constant contact with an oppositely directed gas flow. 2. The method according to claim 1, characterized in that the drum (1) is arranged in an inclined position is and the walls or projections (22,25) are arranged such that the products are continuously in a channel (24) inside the drum through which the gas flow traverses. 3. Method according to claim 1 or 2, characterized in that that wall 3 (22) are arranged, which open chambers form inside the Tromrael, namely such that the rotation of the drum causes the products to move from chamber to chamber in the axial direction of the drum hike. 4 · method according to one of claims 1 to 3, characterized in that the gas flow is an air flow ^is * 909822/0110 - 13 - Ϊ803370 5 · Device for the treatment of "products, especially vegetables, with a rotatable in an inclined position Layer arranged drum, which is accessible on both sides and is provided with protruding parts on its inner wall, as well as with a filling opening for the products to be treated at the top of the drum and with an outlet opening for the treated products at their lower end and with means for passing a gas flow through the drum, characterized in that the parts (22,25) protruding from the inner wall have a Number of open chambers that form in the drum (1) leave a channel (24) free through which a gas flow from the lower end to the upper end of the drum be led know. 6. Apparatus according to claim 5 »characterized by draws that the open chambers by one or more vertical ribs (25) are formed which extend in the longitudinal direction of the drum (1), wherein these ribs intersect one or more annular walls (22). 7. Device according to claim 6, characterized in that that the annular walls (22) are each formed by the surface of a truncated cone in such a way that that the tangent is in the lower portion of the range of free fall of the spreading product lies essentially in the plane of the conical surface. δ. Device according to Claim 7t, characterized in that that the base angle of the conical surface 909822/01 10 - 14 - ORIGINAL INSPSCTED is substantially equal to the angle of inclination of the drum (1). 9> Device according to claim 6, characterized thereby shows that the longitudinal ribs (25) inclined relative to the wall of the drum in the direction of rotation of the drum are. 10. Device according to one of claims 5-9 »characterized in that the inner wall of the Drum (1) is divided into a number of identical open chambers by the ribs and walls (22,25). 11. The device according to claim 10, characterized! that the height of each annular wall (22) formed conical surface and äer lateral distance between two successive annular walls is chosen such that when the drum (1) is in an inclined position, the inner edge of a wall touching perpendicular crosses the lower wall within the distance from this wall to the next wall. 12. Device according to one of claims 5-11 » characterized in that a honeycomb-like grid (13) is provided for the inlet of the gaseous medium, which is arranged at the lower end of the drum (1), as well as a diffuser (14) which is behind this grille is arranged and opens into the open end of the drum. 909822/0110 ■! AL If-ISPECTED