DK158340B - SILO WITH MIXING CHAMBER FOR BUSINESS GOODS - Google Patents

Description

DK 158340 B

in

Knock-down silos are known with a mixing chamber located at the center of the bottom of the silo, which is fed from the silo to the bottom by means of pneumatic air-feeding gutters, in which the shaft 5 is mixed and then taken out through a radially extending outer wall of the screen.

Such silos are used both for the storage of the crash goods and to avoid the use of additional homonogenization silos in which production variations are offset.

French Patent Specification No. 2 110 817 relates to such a silo whose discharge means is connected to the center of the mixing chamber. Through a central pipe in the mixing chamber, dust is extracted from the top, while the discharge is carried out below.

A further discharge is effected through this tube in the upper 15 of the chamber. Guide goods are then passed through a channel under the bottom of the silo to a side discharge. An expensive center column is required for this silo construction.

From German Publication Nos. 26 57 596 20 and 26 26 59 597 silos with a more advantageous side discharge are known through a channel extending to the silo wall, which is closed at the top of the chamber and through which dust is fed to a suction pipe, which is preferably arranged on the outer wall of the silo. In both of these 25 known silos, the side channel is separated from mixing combs by means of a partition wall. Through an opening located below the ceiling in this wall, dust is removed from the mixing chamber, and through another opening located below the intermediate wall, the bulk material flows from the mixing chamber to the side channel. The flow rate of the guide material and the degree of filling of the side channel depend on the cross section of this opening and on the effect of the side withdrawal means.

It is thus not excluded that part of the property,

DK 158340B

2 flowing from the silo through the feed opening to the mixing chamber will follow the shortest path to the side channel and consequently will not participate in the homogenization in the mixing chamber.

It is an object of the invention to prevent this short-circuit flow at a mixing chamber silo with a channel extending radially on the silo wall.

This is achieved according to the invention in that the silo is arranged so that the overload will flow to the channel through an upper opening below the ceiling of the chamber. Guide goods that have flowed from the silo chamber into the mixing chamber must at least flow vertically or diagonally through the chamber before reaching the side channel.

Thereby, the circulating homogenisation flow is safely seized and mixed with the other bulk material in the mixing chamber. The mixture of the finished goods thereby becomes more homogeneous, i.e. that the range of variations will be reduced, since there will be no freight parts that have avoided homogenization by following the aforementioned short-circuit flow.

The invention provides assurance that between the inlet openings of the mixing chamber and the outlet of the bulk material from the chamber to the side channel there is a forced web with the greatest possible extent. This can also reduce the amount of air for the mixing fan homogenizer system, since the flow rate serves only for the necessary homogenisation and no longer for the rapid inclusion of post-flowing shock loads.

A further improvement according to the invention can be achieved by the height of the outlet opening from the mixing chamber to the duct being adjustable. Thus, the mixing chamber need not always be filled to the maximum possible filling.

DK 158340B

3 heights before the load flows to the duct. Thus, during operation, it becomes possible to adjust the overflow height to the most appropriate filling height in the mixing chamber, thus obtaining a good mixing result.

An inferior filling height in the mixing chamber immediately results in energy savings, since the system's fans must produce a lower pressure, and the drive motors will consume less power during electrical operation.

10 The filling height of the mixing chamber depends on the amount of infused and removed bulk material. The outflow of bulk goods through the side channel depends on the need and is thus different. A uniform discharge is ensured at a constant filling height in the duct and a uniform bottom ventilation. According to an embodiment of the invention above, this filling height is monitored by a measuring means which controls the aeration of the silo bottom outside the mixing chamber and thus ensures the filling height in the mixing chamber and the uniform flow to the duct.

20 In this control, the cost of aerating the silo floor outside the chamber is also reduced to the least possible.

In the event that the side discharge of the silo should not occur at the bottom but higher than this, the bottom of the duct 25 is placed higher than the bottom of the mixing chamber. This design also requires a smaller fan pressure to aerate the bottom of the chamber so that an energy saving is achieved.

According to one embodiment of the invention, there is an additional discharge opening at the bottom of the mixing chamber.

This opening forms an emergency exit for use at

DK 158340B

4 malfunctions. Full emptying is provided, and coarse constituents in the bulk material that are excreted in the mixing chamber can be removed downwards.

A particularly simple construction is achieved according to the invention 5 in that the front connection of the second discharge point on the bottom of the mixing chamber is located below the duct.

The invention is explained in more detail below with reference to the drawing, which shows in section an embodiment of a silo according to the invention.

10 The lower part of the illustrated storage strainer silo shown is bounded by an outer wall 1 and a bottom 2. At the center of the bottom is a mixing chamber 3, and between this and the outer wall 1 there is a channel 4 which is separated from the mixing chamber by means of a partition wall. 5. The guide material 15 in the silo reaches through the space shown by 6 and the opening shown by 7 into the mixing chamber 3, where it is mixed with quadrant homogenization treatment. One active quadrant is strongly aerated and three inactive quadrants less aerated. The goods are overturned. The quadrant aeration is rhythmically shifted according to a time schedule so that each quadrant is actively aerated once.

Through the aperture shown in Fig. 8, the plunger reaches the duct 4, as a conduit 9 for extraction of dust is connected. Measuring means 10 senses the filling height in channel 4 and controls the fan 11.

Discharge of the load takes place through the opening 12. Another discharge point in the mixing chamber is found at the opening 13.

Claims (6)

1. A silo for impact with a centrally mounted mixing chamber, which is supplied to the sediment from the silo space at its bottom through pneumatic air feeding channels, and wherein the impact is mixed during flow, and from which the impact is withdrawn through a radially extending channel of the silo. characterized in that the overload flows to the duct (4) through an opening (8) above the chamber ceiling. Silo according to claim 1, characterized in that the lower edge of the outlet opening (8) is adjustable in height. Silo according to claims 1 and 2, characterized in that the filling height is monitored by a measuring means (10) which controls the aeration of the silo bottom outside the mixing chamber (3). Silo according to any one of claims 1-3, characterized in that the bottom of the duct (4) is higher than the bottom of the mixing chamber (3). Silo according to any one of claims 1-4, characterized in that there is an additional opening (13) for the removal of crash goods in the bottom of the mixing chamber (3). Silo according to claims 4 and 5, characterized in that the feed connection from the further discharge port (13) in the bottom of the chamber (3) extends below the channel (4).