FI64110C - FOERFARANDE OCH ANORDNING FOER ATT AVSKAFFA FRIKTIONSKRAFTEN SOM HINDRAR AVRINNING AV STENMATERIAL I EN SILO OCH FOER OEKNING AV TYNGDKRAFTENS AVRINNINGSVERKAN - Google Patents

Description

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A method and apparatus for eliminating the anti-runoff frictional force in a silo and for increasing the drainage effect of gravity. - Förfarande och anordning för att av-skaffa friktionskraften, som hindrar avrinning av stenraaterial i en silo ocör av tyngdkraftens avrinningsverkan.

The invention relates to a method for eliminating the anti-leakage frictional force in a silo and for increasing the gravity flow effect, in which method the frictional force between the siloside is eliminated by a friction plate in the drain hopper The invention also relates to an apparatus implementing the method, which comprises a friction plate in the drain funnel, substantially in the direction of gravity, and a vaulting member above it, into the vaulting space below which air and steam pressure lines open.

Such a method and apparatus are disclosed in the applicant's previous FI patent application 814040. This method and apparatus have succeeded in eliminating the frictional force preventing the aggregate from leaking at the drain hole in the outflow cone. Name the transition point between the outflow cone and the silo as the X-axis. The frictional force above the X-axis can now also be eliminated, because the frictional force below the X-axis has been eliminated first, i.e. it is useful to increase the drainage effect of the gravity. If the frictional force above the X-axis had been eliminated first, the frictional force below the X-axis would have increased, i.e. the silo material would have wedged even more efficiently into the silo outflow cone. As an example of this, reference is made to the applicant's FI application publication 601/69, which has become public and has been rejected. With this known device, the effect of gravity drainage was eliminated.

Instead, the invention reduces the frictional force and thus substantially increases the draining effect of the gravity.

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by means of a parallel friction plate also above the vault member in the silo.

Thanks to the method according to the invention, the flow rate of the silage material is e.g. 1.0 m / min. increases to 1.5 m per minute, for example. In addition to this, another essential advantage is achieved. as a reduction in scroll sorting. As is known, rolling sorting occurs in silos as the silo material moves from the edges toward the vertical passing through the drain opening. Different sized pieces have different rolling angles. At first there will be fine aggregate and when the rolling angle has increased enough, the coarser aggregate will collapse down at once, after which there will again be finer aggregate. According to the invention, a friction plate placed in the silo, which may be several on top of each other to the desired height in the silo, eliminates the friction between the aggregate and thus prevents the formation of rolling sorting.

It should be noted that this is only possible if the frictional force preventing the silo material from leaking has first been removed from the outflow cone.

The device according to the invention is characterized by a friction plate in the silo above the vault member, which is substantially in the direction of gravity.

Since the invention is based on increasing the drainage effect of gravity by dissipating frictional force and compressive force, the kit plates and the vault member must be placed on the same vertical passing through the drain hole so that the point of substance released into the fall hits the drain hole.

In the following, an embodiment of the invention will be described with reference to the accompanying drawing, which shows a schematic vertical section of a silo equipped with an apparatus implementing the method according to the invention.

At the bottom of a vertical, e.g. cylindrical silo there is a casting 3

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a hopper, which in a flat-bottomed silo consists of petrified aggregate, but which is in practice made of a metal plate to reduce friction. The lower end of the drain funnel has a discharge opening, above which the upper end of the drain funnel has a vault member extending across the silo, below which a pressure force is generated by a fan (not shown).

The silo is more or less filled with aggregate. The gravity of the silo material is e.g. 100,000 kg. The compressive force of the air blown under the vault depends on the surface area of the vault and the pressure used.

Immediately above the vaulting member, a vaulting member 6 is arranged, below which a steam pipe 7 opens, the other end of which is connected to a steam generator (not shown). The steam pipe is connected to a valve 8, which is opened and closed only when the air blower is started.

With regard to the compressive forces of air and steam and the effects of the thermal force of steam, reference is made to FI application publication 814040.

The transition point between the drain funnel and the silo is marked X-X. Below the X-X axis, the frictional force between the silos can be greater than the total gravity and compressive force. In this case, the aggregate does not drain from the downcomer and is useless, in fact detrimental to increase the drainage effect of gravity by eliminating the frictional force by various structural arrangements above the X-X axis (cf. FI patent application 601/69). To eliminate the problem, a friction plate is arranged between the vault member and the downcomer in the direction of pressure and gravity, which dissipates the frictional force between the silo material, so that all silos can be pushed out of the downcomer.

The frictional force above the X-X axis can now be eliminated because the frictional force below the X-X axis has been eliminated first, i.e., increasing the drainage effect of gravity is beneficial. This 4

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a friction plate substantially in the direction of gravity is placed in the silo above the vault member. The friction plate or plates in the direction of gravity can be constructed up to the top of the silo, either parallel or crosswise.

It is found that in the method and apparatus according to the invention, the friction plate placed in the silo can be used to increase the gravity drainage effect instead of inhibiting the gravity drainage effect.

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Claims (3)

6411 O A method for discharging an anti-run frictional force in a silo and increasing the gravity drainage effect, wherein the frictional force between the siloside is discharged by a friction plate in the drain hopper substantially parallel to the gravity and gravity and the gravity drainage effect is increased by the frictional force is reduced and thus the draining effect of the gravity is substantially increased by means of a friction plate parallel to the gravity also above the vaulting member in the silo. Apparatus for carrying out the method according to claim 1, the apparatus comprising a friction plate in the drain funnel substantially in the direction of pressure and gravity and a vault above it, into the vault space below which air and steam pressure lines open. Apparatus according to claim 2, characterized in that the friction plates and the vaulting member are located on the same vertical passing through the drainage opening.