DE1912718A1 - Sieve drum for bulk material - Google Patents

Description

MIAG 02/27/1969 Pat / Bu / Re

(EM 9)

"Sieve drum for bulk material"

The invention relates to a screening drum for bulk material, in particular for the pre-cleaning of maize. Particularly corn is delivered to mills with significant and coarse impurities _r that must be eliminated prior to processing.

Up to now, sieve drums have been used for this purpose, which rotate around a horizontal axis in a housing and are covered with objects to be cleaned from obscene and outside will. The impurities accumulate as screen passages and are removed while the cleaned Grain passed the troamel screen surface twice and then caught underneath the drum and discharged will.

Screen drums rotating around a horizontal axis are also known for wet goods, but the The purpose is to remove the fine impurities contained in the bulk material along with the water church to wash the sieve surface through it. For this purpose, the drum is open on one side and contains a feed pipe that approximately horizontally into the drum and continued in a curved shape up to the vicinity of the rear end wall is. Since the material to be screened is flooded with the liquid, the inlet pipe only needs a slight gradient to have. This means that it is dry for the inflow Not suitable for sieving. Also the design of the sieve drum itself does not do justice to the intended use described at the beginning, since there are several concentric Contains sieve jackets arranged to one another and widening conically towards the open end.

00984 1 / 05S9

- a

MIAG - 2 - 27-02, 1969 Pat / Bu / Re

(EM 1429)

The sieve drum described at the beginning with external exposure has a very significant disadvantage indicates that a rather complex distribution of screenings over the length of the drum is required, but that is not the case can prevent the screen surface from being used very poorly. To prevent passages getting into the transitions are also a guide « . Sheets inside the drum as well as a driven beater mechanism are necessary, the tight transitions solves. Due to the complex inlet distribution, the overall height is very large.

With the help of the present invention, the object is to be achieved to avoid the disadvantages of the known types, in particular to make them suitable for dry bulk material, to increase the Sieblelstuag zn and to bless the danger that Siefedurchgäßge continue with the impurities occurring as transitions. The solution to this problem should require little construction effort and work independently of the amount of material to be screened. It is based on the last-described type with internal loading. According to the invention, the oil solution is that the steeply sloping inlet pipe is led up to the vicinity of the rear end wall of the cylindrically shaped sieve drum and the inside of the sieve drum is provided with helical guide surfaces conveying towards the open side. The great inclination of the inlet pipe ensures that the bulk material can flow in without congestion. A cylindrical sieve drum is very easy to produce and also ensures that the material remains in the drum long enough, even when it is heavily filled, to separate the screen transitions and passages from one another. ^ An inlet distribution is completely unnecessary. "- The helical guide surfaces meet except

ο ·

cn the task of gradually moving the screen transitions outwards

^ J to promote, also to prevent the purpose, that the bulk kidney is too far

MIAG - 3 - 02/27/1969 Pat / Bu / Re

• (EM 1429)

extends to the open side of the drum and possibly overflows. Injection grains are also held back by these guide surfaces.

The largest possible, adapted to each bulk material Utilization of the screen surface can be achieved if, according to an embodiment of the invention the inlet pipe has a kinked end piece that is rotatable. This allows the bulk material » current can be set against the direction of rotation of the drum in such a way that the sieve surface is as large as possible Exploitation experiences. A safe function is achieved if the end of the Inlet pipe has a gradient of at least 40 ° from the horizontal in every position.

The sieve drum can be provided with square perforations in a manner known per se. This type of perforation is the most favorable in terms of strength and screen retention. To get stuck grains out of the Removing holes can, according to another design concept of the invention, on the outside surface the drum has a non-powered cleaning system » be arranged brush that by their own weight or by an additional spring load against the sieve surface is pressed. About their cleaning effect The discharge chutes for the screen transitions between the guide surfaces are also used detected so that no clogging can occur here either.

-A -

0098 ^ 1/0559

MIAG - 4 - 02/27/1969 Pat / Su / Re

(ETl 1429)

This new sieve drum is characterized by a. very high performance, simple design and good Ease of use and cleaning. she runs only at a low speed, therefore required so only a small drive requirement. Preferably the peripheral speed is around 1 meter per second. Since the length of the drum is kloin in proportion to their diameter, their space requirements are relatively small. To the storage for the Trommoiwelle too simplify, ea is also possible to have two of the same Drums mirror-inverted at the ends of a common To fasten the shaft.

In the drawing is an exemplary embodiment of the Invention illustrated, and awar show:

Fig.1: a vertical longitudinal section through the Sieve drum and its drive and

Fig. 2: a vertical cross-section along the line II-II of Figure 1.

On a stand 1 there are two bearings 2, in which a shaft 3 is rotatable. This driven by a Kotor 7 via chain wheels 4 ·, 5 and a chain 6 V / elle 3 has one on its other end Sieve drum consisting of a double-walled face 8, a cylindrical screen jacket 9 and an Abechlufiring 10. It is on the inside with guide surfaces conveying towards the open end * » starting about the middle of the length of the tromial. The sieve drum 9 is surrounded by a machine housing 12, which is down in a collecting funnel 1J and on the end wall in one of the discharge of the Sieve transitions serving pipeline 14 continues.

¹ - 5 -009841/0559

MiAG - 5 - 02/27/1969 Pat

(EM 9)

Through the end wall 16 facing away from the bearing 2 of the machine housing a 12 is an inlet pipe 1? ge; leads, the end piece 18 rotatable and opposite the j Inlet pipe 17 is angled. The end piece 18 ends * near the rear, double end wall 8 of the Sieve drum. Furthermore, the end wall 16 contains a '. Pipe socket 19 for sucking off aspiration air .: ';

An opening 20, which can be closed by a cover 21, is located above the drain pipe 14 for the sieve transitions b / e »>'. This cover can be transparent for observing the inside of the drum. After the cover 21 has been removed, a cleaning rod or the like can be inserted through the opening 20; with which all malfunctions can be eliminated easily V and without interrupting operation \ j. Also cleaning the inside of the drum from | Fine parts of the material to be screened can in this way ■ -. take place. ;

As Fig. 2 shows, the end piece 18 of the inlet ' _v '. ■ pipe 17 can be rotated so that it is against the ^! / ümdrehungsrichtung 22 of the sieve drum 9 points. '■! \ Seen in the direction of rotation of the drum 9, lies in _; ) Housing in front of the top dead center of the sieve drum i V a non-driven cleaning ^{brush 23 f} ί with an axis of rotation parallel to the drum axis of rotation. /! · It is pivoted and loaded either by its own weight or additionally by tension springs. It is characterized perforations in a position in the screen \ stuck parts to loosen and break through to ■ '\) inside. i \

- 6 - ■ ORIGINAL'INSPECTED

0 0 9 8 4 1/0559 / 'J \

KIAG - 6 - 02.27.19ö9 '^ ai5 / Bu / Öe

(EM

It can be clearly seen from FIG. 1 that the length of the sieve drum 9 approximately coincides with its diameter. Only in this way it is possible to the feed pipe 17 ^m i * äe® required Kindesfcgefälle of 40 ° up to the vicinity of the rear end wall 8 to. >. to lead. -:

Considering gresogene pamphlet; German patent specification 134 I33

009841/0559

Claims (1)

MIAG - 7 - 02/27/1969 Pat / Bu / Re (St. 1429) Claims 1 / Sieve drum for bulk goods that are placed around a lying, cantilevered shaft is rotatable and on the open end facing away from the bearing has an inclined inlet pipe protruding into the interior of the Trorara and a discharge for the screen transitions, characterized in that the steeply sloping inlet pipe (17) up to the vicinity of the rear end wall (8) of the cylindrical screen drum (9). out and the sieve drum (9) is provided on the inside with helical guide surfaces (11) which convey to the open side. 2. Sieve drum according to claim 1, characterized in that the inlet pipe (17) has a kinked end piece (18) that is rotatable. 5 · Sieve drum according to claim 1 or 2, characterized in that the end piece (18) of the inlet pipe (1?) Has a slope of at least ° from the horizontal in every position. 4. Sieve drum according to claim 1, characterized in that that the guide surfaces (11) begin approximately in the middle of the drum length. 5 · Sieve drum according to one or more of the claims 1 to 4-, characterized in that the sieve surface in well-known catfish provided with square holes 1st. - 8 - 009841/0559 MIAG - 8 - 02.27.1969 Pat / Bu / Re * (EM 14-29) 6 * Screen drum according to one or more of the claims Λ to 5 »characterized in that on the outer circumference of the drum (9) there is a non-drive roller (23). 7. sieve drum according to claim 1, characterized by gelcennzeiciinet, that two sieve drums are mirror images of each other " are attached to the ends of a common shaft. 8, sieve drum according to one or more of the presenting Claims, characterized in that the diameter measer the drum (9) is roughly the same length. 00 9 8 ^ 1/05 59