JPH072104B2 - Method and apparatus for uniformly mixing feed ingredients - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention improves a raw material blending operation, which is one of the steps for producing livestock feed, and implements a method for uniformly mixing raw materials including various additives, and a method for implementing the method. For a device for doing.

[0002]

2. Description of the Related Art In the case of producing a mixed feed for livestock, the raw materials are often mixed, pulverized and then granulated and other processes to produce a product. There are various kinds of raw materials, from granular materials such as grains and beans, powders such as flour, liquids such as oils and molasses, and also chemicals added in trace amounts such as antibiotics and preservatives. Grinding is carried out during compounding, but it is often difficult to obtain a homogeneous mixture in this so-called secondary grinding. The cause is
It is mainly due to the difference in particle size and the specific gravity of the raw material powder.
As shown in FIG. 1, the treatment currently performed is that the mixture of raw materials is continuously taken out from the mixture tank (1) by means of a chain conveyor (2A) or the like, and is continuously applied to a sieving device (3). The coarse powder having a particle size equal to or larger than the above is supplied to the crusher (4) and crushed, and the fine powder having a smaller particle size is directly dropped onto the chain conveyor (2B), and combined with the crushed product from the crusher, the bucket elevator ( 7) etc. to transfer to a product tank (not shown). Fine powder is generated along with the pulverization, and there is fine powder attached to the one with a large particle size, and these fly up as dust, so they are collected by the dust collector (5). When the amount of collected fine powder reaches a certain amount, drop it on the chain conveyor (2B),
Combine with fine powder and crushed product from the beginning.

However, due to the above-mentioned difference in particle size and difference in specific gravity, the fine powder that has passed through the sieve, the pulverized product from the pulverizer, and the fine powder from the dust collector usually have different compositions. The added chemicals are in the form of fine powder and are easily concentrated by a dust collector. The uneven distribution of chemicals is a particularly serious problem because it causes the production of feed that is intolerable to the taste of livestock, and the antiseptic and antibacterial effects cannot be obtained.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art as described above, and to mix two or more kinds of feed ingredients together with crushing in order to control the particle size and specific gravity of the ingredients. It is an object of the present invention to provide a method which always obtains a uniform mixture regardless of the difference. It is also within the object of the present invention to provide an apparatus used to carry out such a method.

[0005]

[Means for Solving the Problems] A method for uniformly mixing the raw materials of the feed of the present invention is to pulverize a mixture containing two or more raw materials constituting the feed with a pulverizer and to generate fine powder with a dust collector. While collecting, the crushed material was sequentially supplied to the stirring mixer operating with the outlet closed, and stirring and mixing were continued. When the raw material in the stirring mixer increased and reached a predetermined amount, it was collected by the dust collector. The fine powder is transferred to a stirring mixer, and the pulverized product and the fine powder are further stirred and mixed for a certain period of time to form a uniform mixture, and then the outlet of the stirring mixer is opened to take out the mixture.

[0006] When the compounded product contains particles of various particle sizes and it is not necessary to grind fine powder having a small diameter among them, the compounded product is sieved before being fed to the crusher to obtain a coarse powder having a certain particle size or more. It is expedient to pulverize only with a pulverizer and to feed fine powder of a smaller particle size directly to a stirring mixer. The present invention includes such aspects, which in many cases will be rather representative aspects.

The apparatus for uniformly mixing the raw materials of the feed of the present invention is, as shown in FIG. 2, generated by a pulverizer (4) for pulverizing a blended product containing two or more raw materials constituting the feed. Consisting essentially of a dust collector (5) for collecting fine powder to be collected, a crushed product obtained by the crusher, and a stirring mixer (6) for stirring the fine powder collected by the dust collector to form a uniform mixture. As the machine, it is possible to uniformly mix the supplied materials by operating with the outlet closed, and use the one capable of discharging the contents by operating the outlet opened. When the content of the stirring mixer reaches a certain amount, the supply of the blended product to the crusher is stopped, the fine powder collected by the dust collector is transferred to the stirring mixer, and after further stirring and mixing for a certain period of time. , The outlet of the stirring mixer There are those, which is configured as out to take the contents.

The above-mentioned apparatus used when sieving is carried out prior to crushing, as shown in FIG.
A sieving device (3) is provided so that the blended product is sieved to send coarse powder having a certain particle size or more to a pulverizer, and fine powder having a smaller particle size is directly supplied to a stirring mixer.

As a stirring mixer, as shown in FIG.
A screw mixer provided with a ribbon (61) and rotating and stirring the screw (62) is suitable. In this screw mixer, the crusher (4) and the dust collector (5) are located directly above the screw mixer, and some parts of them have a gutter-shaped casing with an open upper part. It is convenient because the transfer of the fine powder collected in step 7 can be allowed to fall naturally.

[0010]

In the apparatus shown in FIG. 2, the valve SD1 is activated at the time of starting.
Open SD2 and close SD3. These valves are optional, such as slide gates, butterfly valves, and cut dampers, and appropriate ones are selected and used according to the processing target. The blended product taken out from the blended product tank (1) by a conveying means such as a chain conveyor (2A) is first classified in a sieving device (3), and coarse powder having a certain particle size or more proceeds to a crusher (4). It is crushed and then dropped into a stirring mixer (6). The fine powder having a small diameter is directly supplied to the stirring mixer.

Since the screw mixer, which is a stirring mixer, is operated with the outlet valve SD3 closed,
Directly supplied raw material and raw material supplied after crushing,
While staying there, they are agitated and mixed. The ribbon attached to the screw serves to scrape and mix the powder in the case. Since the amount of raw material supplied to the stirring mixer gradually increases, a level switch (LSW) is provided in the stirring mixer, and when a certain amount is reached, SD1 and SD2 are closed and further supply is stopped. .

During this time, since the dust generated by the crushing is collected by the dust collector, the collected dust is dropped to the crusher. This can be done by, for example, operating the dust collector as an inverter system and lowering the number of revolutions of the suction blower to lower the collection capability. By continuing to operate the agitation mixer for a certain period of time, the fine powder that has fallen therein is agitated together with the fine powder and the pulverized material that have accumulated, and a mixture is obtained by mixing them together.

Once a sufficiently intimate mixture has been formed,
Open SD3 and drain the mixture in the agitator mixer. When discharge is completed, open SD1 and SD2 again, and
Close D3 and resume sieving and grinding as above. The following operation is a repetition of the above.

By repeating the batch mixing operation in this manner, a mixture in which the respective raw materials are uniformly mixed is obtained in at least one batch. Generally, the raw materials can be blended relatively uniformly, and it is easy to make the composition in the blended tank almost homogeneous. Therefore, a mixture that is uniform as a whole and in which certain components are not unevenly distributed is can get.

[0015]

[Example] 50 kg of dried corn (crushed to a size of about 2 mm) as a main raw material, skim milk powder 30 kg, wheat flour 1
0 kg and 10 kg of bread crumbs (particle size of about 500 μm) were used as auxiliary materials, and a total of 1 kg of additives including chemicals such as various minerals, vitamins and amino acids was added to the mixture to prepare a blended product.

This compound was fed to the apparatus shown in FIG. First, it was sieved with a sieve having an opening of 1 mm, and the corn grains remaining on the sieve (to which powders of various raw materials adhered) were pulverized with a pulverizer. The fine powder that passed through the sieve and the pulverized product from the pulverizer were supplied to a horizontal screw type agitation mixer (with a ribbon) having a capacity of 1 ton, and agitated and mixed. The suction force of the dust collector was reduced when it was detected by the level meter installed in the stirring mixer that the content increased to 1/3 of the capacity. As a result, the fine powder collected by the bag filter is dropped into the agitating mixer, and further 2
The agitator mixer was run for 0 minutes and then discharged to obtain a powder mixture.

When each part of the continuously discharged mixture was analyzed, the variation in the content of minerals, vitamins and amino acids was within ± 10% of the predetermined value.

[0018]

EFFECTS OF THE INVENTION According to the mixing method of the present invention, in the preparation of compounded feed accompanied by pulverization, uneven distribution of some raw materials due to the difference in particle size and specific gravity of the raw materials is prevented, and a mixture having a uniform composition is prepared. be able to.

The apparatus of the present invention used for carrying out this method has a stirring mixer such as a screw mixer with a ribbon added to the apparatus which has been conventionally used, and some auxiliary equipment such as a valve and a level switch. It can be configured simply by adding, and the equipment cost and operating cost are not much different from the conventional one.

The fact that a homogeneous mixture of feed ingredients was obtained guarantees that the feed obtained by processing it is also homogeneous, and there is no fear that it will not be eaten because it does not meet the taste of livestock. As expected, it is possible to prevent spoilage and propagation of pathogens.

[Brief description of drawings]

FIG. 1 shows the case of mixing feed ingredients with grinding.
Partly a conceptual explanatory view showing a conventionally used device.

FIG. 2 is an explanatory view showing the device of the present invention in correspondence with FIG.

[Explanation of symbols]

1 ... Compound tank 2A, 2B ... Chain conveyor 3 ... Sieving device 4 ... Grinding machine 5 ... Dust collector 6 ... Agitation mixer 7 ... Bucket elevator 8 ... Inverter SD1, SD2, SD3 ... Valve LSW ... Level switch

Claims (5)

[Claims] 1. A pulverizer is used to pulverize a mixture of two or more raw materials constituting feed, and the fine powder generated is collected by a dust collector while being pulverized by a stirring mixer operating with its outlet closed. The materials are sequentially supplied to continue stirring and mixing, and when the amount of raw material in the stirrer reaches a predetermined amount, the fine powder collected by the dust collector is transferred to the stirrer and mixer, and the pulverized product and this fine powder are mixed for a certain period of time. A method of mixing the feed ingredients uniformly by further stirring and mixing to form a uniform mixture, and then opening the outlet of the stirring mixer to take out the mixture. 2. The method according to claim 1, wherein the blended product is sieved, coarse powder having a certain particle size or more is pulverized by a pulverizer, and fine powder having a smaller particle size is directly supplied to a stirring mixer. 3. A crusher (4) for crushing a compounded product containing two or more kinds of raw materials constituting a feed, a dust collector (5) for collecting fine powder generated by crushing, a crushed product obtained by the crusher, and It essentially consists of a stirring mixer (6) for stirring and mixing the fine powder collected by the dust collector to form a uniform mixture, and as the stirring machine, the one supplied by operating with the outlet closed is made uniform. Mixing is possible when the contents of the stirring mixer reach a certain amount, as well as being able to mix and discharging the contents by opening the outlet for operation. Feed that is configured to stop the supply of the product and transfer the fine powder collected by the dust collector to the agitating mixer to continue the agitating and mixing for a certain period of time, and then open the outlet of the agitating mixer to take out the contents. Mix the ingredients of Device. 4. A sieving device (3) is provided, the compounded product is sieved, and coarse powder having a certain particle size or more is sent to a crusher,
An apparatus according to claim 3, wherein fine powder having a smaller particle size is directly fed to the stirring mixer. 5. The apparatus according to claim 3, wherein the agitating mixer is a screw mixer provided with a ribbon, and the crusher and the dust collector are located right above the screw mixer.