JPS6121693B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for uniformly mixing powder and liquid in a short time.

Equipment that uniformly mixes powder and liquid is required in many industrial fields, including the food industry.
Therefore, various mixing devices have been developed. Most of this type of conventional mixing equipment is batch type, but
Whether it is a batch type or a continuous type, powder and granules and liquid are simultaneously injected and mixed by stirring by mechanical means. With such equipment, the powder and liquid do not easily become homogeneous, and it takes a long time to mix them uniformly, which causes heat generation and work hardening, which hinders the subsequent processing of the mixture. It often causes problems. In addition, some continuous mixing devices have already been proposed, but in addition to the problems mentioned above, these devices have drawbacks such as shearing action on the mixture during mixing and the inability to use liquids with high viscosity. It was hot.

The present invention proposes an apparatus that can mix powder and liquid continuously for a short time and extremely uniformly.

One of the most important characteristics of a mixture is uniformity, but the reason why desired uniformity cannot be achieved in conventional stirring type mixing equipment is the mixing condition of the powder and liquid, and more specifically, the mixing condition. It is thought that it is in a place where it mixes with the liquid state at the time.

In the present invention, when the powder and granules are mixed with a liquid while being transported in the axial direction by a rotating blade in a sealed fixed cylindrical casing, the liquid is continuously introduced into the casing at a point away from the central axis of the casing. The particles are introduced into the casing and applied to the tips of the dispersion blades, thereby scattering the powder toward the inner wall of the casing and mixing with the powder near the inner wall of the casing. According to the mixing device of the present invention, the liquid to be mixed with the powder or granules is applied to the tips of the rotating blades before being mixed with the powder or granules, preferably immediately after being introduced into the casing, and is splashed onto the inner wall of the casing. Directed. Furthermore, the powder and the splashed liquid are mixed near the inner wall of the casing.

Various means can be considered for scattering the liquid introduced into the casing toward the inner wall of the casing, but the most typical method is to use a powder dispersion blade attached to a rotating shaft extending axially through the center of the cylindrical casing. ,
In addition to the mixing blade and the feeding blade, a set of liquid dispersion blades is provided in the radial direction, a liquid supply port is provided at a position on the inner wall of the casing corresponding to the position of the liquid distribution blade, and the blade is rotated at a high rotation speed as a mixing device. It is preferable to rotate at The liquid that is continuously supplied into the casing from the liquid supply port is scattered by liquid dispersion blades that rotate at high speed together with the rotating shaft, and most of the liquid is directed toward the inner wall of the casing.
On the other hand, the powder is scattered and collected in a film around the inner wall of the casing by the high-speed centrifugal force of the powder dispersion blade, mixing blade, and feed blade. Here, high speed refers to a rotation speed of approximately 1000 revolutions per minute or more.

According to the above-mentioned device, it is possible to achieve highly uniform mixing in a short time, in other words, with a narrow powder distribution, so there is almost no temperature rise during mixing, and even if there are some lumps in the powder or granules, Because a homogeneous mixture is obtained and complete contact between powder and liquid occurs, no raw materials remain unmixed in the mixing device, and the mixing takes place close to the inner wall of the casing. This has the advantage that the mixture hardly sticks to the rotating shaft, making cleaning the casing easier.

As shown below with some examples, the device of the present invention can be applied to fields where it is necessary to uniformly mix powder and liquid in a short time, such as noodle making and It can be widely used not only in the food industry such as bread and confectionery, but also in the fields of pharmaceuticals, feed, cosmetics, and synthetic resins.

The apparatus of the present invention will be explained in detail below with reference to the drawings and examples.

The accompanying drawing shows an embodiment of a continuous mixing device according to the present invention, in which the powder and the liquid are mixed inside a sealed fixed cylindrical casing 1. A rotating shaft 2 extending in the axial direction is provided at the center of the casing 1, and both end plates of the casing 1 and the rotating shaft 2 are airtight. A supply port 3 for supplying powder and granular material is provided near one end of the casing 1, and a discharge port 4 for taking out the mixture is provided near the other end. In this mixing device, the granular material is transferred from the left to the right in the axial direction inside the casing. The rotary shaft 2 includes a set of powder dispersing blades 5 near the powder supply port 3, preferably immediately downstream of the supply port 3, and then a set of powder dispersing blades 5 downstream of the powder dispersion blades 5 at a distance downstream thereof. Immediately downstream thereof is a set of liquid dispersing vanes 7, downstream thereof is a set of powder and granular material transporting vanes 8, followed by two sets of granular material dispersing vanes 6, and further a set of powder and granular material dispersing vanes 6. A powder feed blade 8 is provided. On the downstream side thereof, the necessary number of feed vanes and mixing vanes are provided in appropriate combinations as required. Regarding the feathers, "a set of feathers" means:
Refers to two or more blades that draw the same rotation locus, such as a pair of blades provided on the rotating shaft 2 in the radial direction, separated by 180 degrees from each other, or four blades provided in the radial direction, separated by 90 degrees from each other.

The powder dispersing blade 5 and the feeding blade 8 have blade surfaces inclined with respect to the transfer direction in order to disperse the powder and transfer it in the axial direction of the casing 1. 6 is a rod-shaped body or a flat plate depending on the purpose. Further, it is preferable that the gap between the mixing blade 6 and the inner wall of the casing 1 be as small as possible.

The liquid dispersing blade 7 is made slightly shorter than the powder dispersing blade 5, the mixing blade 6, and the feeding blade 8, but its shape is a rectangular flat plate similar to the powder dispersing blade 5 and the feeding blade 8, or the mixing blade A rod-shaped body similar to the blade 6 is used. The shapes of all the blades attached to the rotary shaft 1 should be designed so that they do not have sharp edges and are rounded if possible, so that no shearing action is applied to the mixed powder and granular material. This is extremely important in mixing raw materials for noodle production.

The liquid supply port 9 is in the form of a nozzle that penetrates the wall of the casing 1 and extends into the interior of the casing 1, and is located at a position corresponding to the liquid dispersion vane 7, i.e., at a position corresponding to the liquid dispersion vane 7.
or in the vicinity thereof, preferably slightly upstream. The liquid supply nozzle 9 is inserted into the center of the casing 1 to the extent that it penetrates the powder and granules that are layered on the inner wall of the casing 1 and dispersed in the circumferential direction and comes out inside the inner surface of the powder and granule layer during mixing. Let it extend towards you.

The illustrated mixing device can be used in a horizontal state, vertical state, inclined state, etc. as required, so depending on the usage state, the powder supply port 3
The mounting position and orientation of the mixture outlet 4 can be changed as appropriate. Mixing device with mixture outlet 4
If you use it in an inclined position where the
The granular material sending blade 8 is not necessarily required. Further, the powder dispersing blade 6 provided between the powder dispersing blade 5 and the liquid dispersing blade 7 is the first liquid dispersing blade 7.
This is necessary to enhance the dispersion effect when the powder alone is not sufficiently dispersed, and if necessary, a function of promoting the transfer of the powder may be provided.

The operation of mixing powder and liquid with the mixing device of the present invention is as follows.

The rotating shaft 2 of the mixing device is rotated at a high speed of usually 1000 to 3000 revolutions per minute, and the powder supply port 3 is
Supplies powder and granular material. The powder and granules are dispersed by the dispersing blades 5 and with the aid of mixing blades 6 provided as necessary, and are transported downstream in a layered manner on the inner wall of the casing 1. On the other hand, liquid is continuously supplied into the casing 1 from the liquid supply nozzle 9, but before reaching the rotary shaft 2, the liquid is struck by the tip of the liquid dispersion blade 7 rotating at high speed, causing the liquid to flow into the casing 1. Scattered towards the inner wall. This scattered liquid is mixed with the powder and granules that are transported in a layered manner along the inner wall of the casing near the inner wall while being transported downstream. The powder and liquid are gradually mixed by the combination of the mixing blade 6 and the sending blade 8, transferred downstream, and continuously taken out from the mixture outlet 4.

The residence time of the supplied powder and liquid inside the casing is extremely short compared to conventional equipment, and can be freely adjusted by adjusting the rotation speed of the rotating shaft, the number of feed blades, and the angle. . The most important and great advantage of the present invention is that uniform mixing can be achieved within this extremely short mixing time.
This fact was confirmed in several examples shown below.

Example 1 Water with a Baume degree of 4 (viscosity of about 5 centipoise)
When 128 kg/hour and 400 kg/hour of strong wheat flour were mixed at 2000 revolutions per minute using the mixing device of the present invention and noodles were made using the conventional manufacturing method, there was no uneven mixing on the surface of the noodle strips compared to the conventional mixing device. Chinese noodles were obtained that had no stripes and had a high elasticity and elasticity.

Example 2 Water with Baume degree 4 containing 3% thickened clay (viscosity approx. 1000)
centipoise)) 87Kg/hour and strong flour approx. 300
Kg/hour were mixed at 2,000 revolutions per minute using the mixing device of the present invention, and Chinese noodles were made using a conventional noodle making machine, and noodles with high elasticity were obtained.

Example 3 90 kg/hour of Baume degree 6 salt water and 300 kg of ordinary flour
When udon noodles were made using a noodle making machine that mixed Kg/hour at 1500 revolutions per minute using the mixing device of the present invention, udon noodles with a smoother and softer texture were obtained compared to udon noodles made using a conventional device. It was done.

Example 4 200 kg/hour of mixed powder consisting of 100% wheat flour, 11% salt, and 0.3% baking powder was mixed with 30kg/hour of water using a mixing device according to the present invention at 1500 revolutions per minute, and dried by a conventional method. A uniform granulated flour with good properties was obtained.

Example 5 Flour 100 (strong type 70 and medium strength type 30), sugar
12, salt 1.5, powder removal 3, baking powder 1,
300 kg/hour of mixed powder consisting of 0.1 yeast food and 30 kg/hour of pre-heated liquefied shotoning with a melting point of 30°C are mixed every minute using the mixing device of the present invention.
When mixed at 2000 rpm, a mixed powder was obtained that was extremely soft and had a uniform viscosity.

Example 6 Mixed powder consisting of 100% weak wheat flour, 15% sugar, 4.5% deflour, 1% salt, and 0.8% ammonium carbonate, 250%
Kg/time and water with dispersed toning 75
Kg/hour was mixed at 2000 revolutions per minute using the mixing device of the present invention, and a homogeneous mixture was obtained.

Example 7 Diatomaceous earth 200Kg/hour and vitamin E acetate solution 80
Kg/hour was mixed at 1500 revolutions per minute using the mixing device of the present invention, and an extremely soft powder of vitamin E was obtained.

Example 8 250 kg/hour of a powder mixture consisting of 25 Milo, 47 Corn, 13 Soybean Meal, 11 Fatty Meal, 3 Minerals, and 1 Vitamin, and 60°C to 70°C in advance.
As a result of mixing 13 kg/hour of warmed tallow with the mixing device of the present invention at 1500 revolutions per minute, a uniform mixed feed for broilers was obtained.

Example 9 Corn 16, Milo 63, Bran 2, Soybean meal
13. When 200 kg/hour of a mixed powder of 2 fat meal, 3 minerals, and 1 vitamin mix was mixed with 12 kg/hour of pre-heated molasses at 2000 revolutions per minute using the mixing device of the present invention, the result was extremely A mixture with good dispersion of molasses was obtained.

In all of the examples exemplified above, the resulting mixtures had a very narrow particle size distribution, in other words, they were homogeneous. In order to compare the uniformity of the mixture according to the present invention with the uniformity of a mixture produced by a conventional apparatus, for example, the moisture content and particle size of a mixture obtained by mixing 100 parts of wheat flour and 38 parts of water are measured. In the device according to the invention, the water content of the mixture is
The particle size of the mixture falls within the range of 38±0.5%, whereas that of the conventional device falls within the range of 38±10%, and with the device of the present invention, the particle size of the mixture
90% is 2000μ, 10% is 800-1000μ, whereas with conventional equipment, 55% is 4000μ or more, 15% is 800-4000μ, and 800μ
The following items accounted for 30%: It is clear from this that the homogeneity of the mixtures obtained according to the invention, i.e. the water content and the particle size, has a considerably narrower distribution compared to mixtures obtained with conventional equipment. In addition, the present invention can be applied to powders with a small particle size such as wheat flour and relatively large particles such as crushed grains.
It has been confirmed that similar high uniformity can be obtained in a short time even when applied to mixing a liquid with a low viscosity such as water and a liquid with a relatively high viscosity such as an X-former solution.

In the mixing device according to the present invention, the number of liquids to be mixed with the powder and granules is not limited to one type, but two or more types of liquids are introduced into the casing at appropriate positions in the casing to move the powder and granules in the axial direction. It is possible, however, in each case for the introduced liquid to be splashed and directed to the inner wall of the casing before mixing.

In the illustrated embodiment, the liquid is introduced by a nozzle penetrating the inner wall of the casing, but instead, a liquid discharge port is provided at the tip of the liquid dispersion vane, and the liquid guided inside the rotating shaft is discharged. A similar effect can be obtained by discharging it continuously from the outlet and scattering it toward the inner wall by the centrifugal force generated by the rotation of a rotating shaft.

[Brief explanation of the drawing]

The accompanying drawing is a partially cutaway side view showing an embodiment of the mixing device according to the present invention. 1...Cylindrical casing, 2...Rotating shaft, 3
...Powder supply port, 4...Mixture outlet, 5...Powder and granule dispersion blade, 6...Powder and granule mixing blade, 7...Liquid dispersion blade, 8...Powder and granule sending blade.

Claims (1)

[Claims] 1. A cylindrical casing having a powder supply port near one end and a mixed powder/grain material outlet near the other end, and a shaft capable of high speed rotation extending in the axial direction through the center of the casing. , a set of granular material dispersing blades installed perpendicularly to the shaft near the granular material supply port, and a plurality of sets of granular material dispersing blades installed perpendicularly to the shaft on the downstream side of the granular material dispersing blades. At least one set of liquid dispersion vanes is installed perpendicularly to the shaft on the downstream side of the powder dispersion vane in a relatively upstream portion of the cylindrical casing, and the liquid dispersion A liquid introduction nozzle is made to protrude from a position on the inner wall of the casing corresponding to the blade toward the center axis of the casing, and the length of the liquid dispersion blade that protrudes in the radial direction from the shaft surface of the cylindrical casing is Continuous powder and granule mixing, characterized in that the lengths of the powder and granule dispersing blades, the powder and granule transporting blades, and the powder and granule mixing blades are set to be shorter than the lengths of the powder and granule material mixing blades, which are provided so as to minimize the gap with the inner wall. Device.