JPH0435210B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a ribbon mixer that mixes materials by moving them from side to side in the lateral direction of a casing.

[Conventional technology]

In the raw material mixing process in feed manufacturing, in addition to general raw materials such as corn, trace amounts of raw materials such as minerals, vitamins, and amino acids are mixed at the same time. This minute amount of raw materials has a small absolute amount, high specific gravity, and small particle size, so mixing accuracy cannot be improved. Therefore, after increasing the amount with a diluent to make it easier to mix, it is mixed using the ribbon mixer mentioned above. .

This ribbon mixer, as shown in Figure 1,
On the outer periphery of the rotating shaft 3 in the transverse direction inside the casing 5, band-shaped outgoing blades 11 and returning blades 12 spiraling in the axial direction are attached with the former located on the outside and the latter on the inside. Through 3, both blades 1
1 and 12 are rotated to move the mixture a to the right inside and outside the casing 5, and also to move the inside of the casing 5 in the left and right directions for mixing. in this way,
When the flow of the mixed material a is created in the vertically opposite direction, a complicated mixing action is performed in which the mixed material a transfers to the opposite flow due to its own weight, so that a high mixing efficiency is obtained. That is,
Obtain high mixing accuracy.

In the feed industry, mixing accuracy refers to the degree to which the required mixing ratio is achieved throughout the feed, and is usually expressed as a CV value calculated by (standard deviation) ÷ (average value) x 100.

[Problem to be solved by the invention]

By the way, in the mixing operation of feed, problems in accuracy arise under the following conditions (a) to (d).

(a) In the case of a group of raw materials with a large difference in apparent specific gravity, e.g. 0.4 to 1.6 g/cm ³ (b) In the case of a group of raw materials with a large difference in particle size, e.g. 200 Me to 3.8 m/m, (c) In the case of a lump (d) When containing a (trace amount) raw material with a low mixing ratio of about 0.01% by weight, under these conditions (a) to (d), mix with the above ribbon mixer. During operation, because there is always a gap between the blades 11 and the casing 5 in the ribbon mixer due to the workmanship and material strength, the raw material remains in this gap, and especially in the case of condition (a), materials with high specific gravity remains, and in the case of condition (d), if trace amounts of raw materials remain, the raw materials will hardly be mixed up.

Furthermore, since the flow of the mixture a is relatively slow, once the mixture a forms a lump, the lump remains without being sheared, and the work is completed as it is. In other words, there is also a problem with condition (c).

For this reason, conventionally, in mixing operations under the above conditions (a) to (d), we have used rotary/revolution screw mixers (commonly known as Nauta mixers), rotary mixers with rotating cases, etc., which have high mixing accuracy. . but,
The amount of mixing in one operation is small and it takes time, so the workability is very poor.

In addition, under condition (c), raw materials that tend to clump are made into mackerel by using a diluent such as defatted rice bran, and under condition (d), as mentioned above, a small amount of raw materials is increased by increasing the amount of raw materials such as onion powder. After pre-mixing to increase the volume by 10 or 100 times, the main mixing is carried out in a large volume.

Furthermore, in the case of raw materials with poor mixing conditions, measures are taken such as premixing several batches of raw materials for the main mixing and adding the raw materials to the main mixing in several batches.

However, premixing is time-consuming and has poor workability.

The present invention has been made with the above points in mind, and an object of the present invention is to provide a mixer that can obtain a large capacity and high mixing accuracy even under each of the conditions (a) to (d), such as containing trace amounts of raw materials. do.

[Means to solve the problem]

In order to achieve the above object, in this invention, a band-shaped outgoing vane and a returning vane spiraling in the axial direction are placed around the outer periphery of the rotating shaft in the transverse direction within the casing, with the former being located on the outside and the latter being located on the inside. In the conventionally known ribbon mixer, the outgoing blade is provided with the lateral gate plate close to the inner surface of the casing, and the gate plate extends over the entire lateral length of the outgoing blade when viewed from the front. The structure was designed so that

A scraper made of a flexible material that slides into contact with the inner surface of the casing can be provided on the outer edge of the gate plate.

The casing may be rotatable about the rotation axis.

[Effect]

In the mixer configured in this manner, as in the conventional mixer, flows of the mixed materials are created in opposite directions vertically and horizontally, and in this flow, the materials to be mixed are transferred to the opposite flow due to their own weight to perform mixing.

At this time, some of the materials to be mixed (particularly those with high apparent specific gravity) heading toward the bottom of the case try to stay at the bottom, but the gate plate, which rotates intermittently, prevents the mixture from moving in the direction of rotation (the direction of rotation of the casing). On the other hand, the rear surface of the gate plate that has been sprung up and plowed through has an effect of entraining the surrounding to-be-mixed material. Further, the action of this gate plate cuts off the flow in the left and right direction due to the blades, causing turbulence in the flow.

In this way, the blades and gate plate perform various actions on the materials to be mixed, resulting in smooth mixing.

Furthermore, even if the mixed material tries to stay in the gap between the blade and the gate plate and the casing, the circumferential rotational force by the gate plate is considerably larger than the left-right force by the blade, so the mixed material tries to stay in the gap between the blade and the gate plate and the casing. is drawn into the mixed material that is splashed up and swept aside by the gate plate, and the amount of mixed material that remains is smaller than in a case without a gate plate. Therefore, if the above-mentioned scraper is provided, the remaining amount will be almost eliminated.

Also, if the casing is rotated intermittently at a required angle during the mixing action, the lowest part of the casing will be displaced, and the materials to be mixed that have remained there will enter the flow due to their own weight and be mixed. Changes are made to the flow and the degree of mixing is increased. Furthermore, by inverting the casing, the mixture can be reliably discharged.

This invention has the above-mentioned effects, but the above conditions (a) ~
(d) is solved as follows.

() Regarding condition (a), due to the difference in apparent specific gravity, heavy materials to be mixed naturally tend to stay at the bottom of the casing, but if the difference is small, they will be mixed while being drawn into other materials to be mixed. However, if the difference is too large, its drawing action will decrease and it will remain at the bottom. This remaining mixed material is splashed up by the gate plate.
It is scraped up and mixed again while going to the bottom.

Conversely, materials with a light apparent specific gravity may float in the upper layer, but are scraped into the interior by the gate plate.

() Regarding condition (b), the larger the particle size of the mixture, the more it moves in the upper layer,
The smaller the particles, the more they tend to collect in the lower layer, and the longer the mixing time, the more this phenomenon will be exacerbated. The materials to be mixed separated into the upper and lower parts in this manner are drawn into the interior by the gate plate and mixed.

() Concerning condition (c), if the flow from side to side is gentle, clumps are likely to occur, but the gate plate rotates in the circumferential direction of the casing and flips up to cut the flow of the mixture by the blades.
Because of the scraping action, this action applies a shearing action to the mixture that is beginning to clump, thereby preventing it from clumping.

() Regarding condition (d), since the left-right flow caused by the blades is gentle, it is difficult for trace amounts of mixed substances to gather in one or several places and mix with the flow. However, because the left and right flow is intermittently cut off by the gate plate,
The left and right flow becomes turbulent in all directions,
This turbulence promotes the mixing of trace amounts of substances.

〔Example〕

As shown in FIGS. 1 and 2, the frame F
A box-shaped case 1 is provided, and the lower part of this case 1 is a popper 2. A rotating shaft 3 is provided on the horizontal axis of the case 1, and this rotating shaft 3
A gutter-shaped casing 5 is rotatably attached via a bearing 4 to the casing 5 . The casing 5 is connected to a motor 8 with an electromagnetic brake via the bearing 4, shaft 6, and reduction gear 7. When the motor 8 rotates, the casing 5 rotates by 15 degrees, 30 degrees, 45 degrees, and reverse rotation (90 degrees). degree), etc., to an appropriate angle. This inclination angle is detected and stopped by detecting the operating rod 10, which rotates at the same time as the shaft 6, using a limit switch 9 provided at a predetermined position on the case 1.

On the outer periphery of the rotating shaft 3, two band-shaped outgoing blades 11 and a returning blade 12 are attached to the outer periphery of the rotary shaft 3, with the former being located on the outside and the latter being located on the inside, which spiral in the axial direction, and are rotated by a motor M. When the shaft 3 rotates as shown by the arrow in FIG.
The blade 12 is moved to the right, and the blade 12 is moved to the left. The widths t and t' of the blades 11 and 12 are the widths t and t' of the blades 1
It is preferable to set the conveyance amount by 1 and 12 to be almost the same (see FIG. 3).

Between the two blades 11, 11, a horizontal gate plate 13 is provided in a staggered manner when viewed from above, and when viewed from the front (Fig. 5). The mounting position of the gate plate 13 is
As long as the entire length of the blade 11 is covered in the front, it may be in any direction, such as in a straight line. In this manner, when the entire length is covered, any one of the gate plates 13 performs the action of lifting and scraping the mixed material a over the entire length of the inner surface of the casing 5 in the lateral direction. Gate plate 1
A scraper 14 made of rubber is fixed to the outer edge of the casing 3, and this scraper 14 rotates while slidingly contacting the inner surface of the casing 5.

The upper surface of the case 1 is provided with a material to be mixed (raw material) input port 15, an inspection port 16, and an air vent 17. The material to be mixed a is introduced into the casing 5 from the input port 15, and , blade 11,1
After mixing by the hopper 2 and the gate plate 13, the casing 5 is turned over and sent out from the hopper 2 to the next process.

This embodiment has the above configuration, and the casing 5
When the to-be-mixed material a is put into the tank and the rotating shaft 3 is rotated, a flow of the to-be-mixed material a is created in the vertical and horizontal directions by the blades 11 and 12, and as shown in FIG. At the boundary surface, as shown by the arrow, the object to be mixed a moves downward due to its own weight, enters the opposite flow, and is mixed.

At this time, a part of the mixture a toward the lowest part of the casing 5 (such as one with a large apparent specific gravity)
tries to stay at the bottom, but the gate plate 13, which rotates intermittently, flips it up in the direction of rotation, scrapes it aside, and creates a mixing effect. The surrounding to-be-mixed material a gets caught up in the mixture, promoting the mixing action. Furthermore, since the gate plate 13 acts to cut off the flow in the axial direction (rightward direction) due to the blades 11, turbulence occurs in the flow in the rightward direction, and this action suppresses the shearing action of the mixture a that is about to clump. Facilitate.

If the casing 5 is tilted during the mixing action, as shown in c in the same figure, the state of the upper layer of the material to be mixed a changes, which further changes (disturbs) the mixing action and increases its efficiency. In addition, as shown in FIG. bounced up,
The raking action is reliably performed. Therefore,
Width of scraper 14 (radial direction of casing 5)
is set to have a length that can fill the gap.

After performing the above mixing action for a predetermined time, the rotating shaft 3
While turning the casing 5, the casing 5 is turned over and the mixed material a is discharged, as shown in d and e of the figure. In this way, when the blades 11, 12 and gate plate 13 are rotated while being discharged, the upper layer portion and the lower layer portion are discharged while being mixed, so that the mixing ratio is further improved.

According to this example, Fe,
When Cu, Zn, Mn, and Na were mixed at a weight ratio of 0.01%, the CV values for Na were in the 6 range, but the CV values for the others were in the 5 range or less.

In addition, as an actual machine, for 300Kg (casing capacity
400Kg) was made and mixed with 100Kg of material a (filling rate 25%), as shown in Figure 4g, the material a sent by the inner blade 12
In the middle of the casing 5, the material falls into the gap left by the winding up by the reverse feed gate plate 13 by the outer blade 11, and rides on the feed by the outer blade 11. In other words, the flow is in the opposite direction.
Since the flow of the materials sent later is similar, the reversal point (falling point) of the materials is mixed while maintaining the rising angle α corresponding to the rotational speed of the blades 11, 12 and the gate plate 13. In this way, the mixing action was repeated on the side of the outer blade 11 in the feeding direction from the drop point.

In addition, in the ribbon mixer without the gate plate 13, there is almost no rise when the filling rate is 25% or less.
Mixing accuracy becomes extremely poor. Normally, a rise occurs at about 50%, and mixing accuracy is poor when the filling rate is less than 40%, so it cannot be used in products that require high mixing accuracy. Incidentally, if the rise does not occur, the transfer to the opposite flow in the left and right flows will be slow, and the mixing accuracy will decrease.

〔Effect of the invention〕

This invention is configured as described above, and since the horizontal flow in the ribbon mixer is added with the bouncing and scraping action of the gate plate in the circumferential direction of the casing, even under the above conditions (a) to (d), the mixing accuracy can be improved. A high degree of mixing can be achieved.

Furthermore, if a scraper is provided on the gate plate or the casing is made tiltable, the mixing accuracy will be further improved.

The mixer of the present invention can efficiently mix even trace amounts of substances, so when producing medicated feed products that contain chemicals such as antibiotics, synthetic antibacterial agents, and preservatives, it is possible to mix them without containing these chemicals. Non-medicated feed products can also be mixed with these chemicals to produce medicated feed products.

[Brief explanation of drawings]

Fig. 1 is a cutaway front view of an embodiment of the mixer according to the present invention, Fig. 2 is a plan view of the embodiment, Fig. 3 is a cutaway side view of essential parts of the embodiment, and Figs. 4a to 4g are It is an explanatory diagram of the operation of the same embodiment. 1... Case, 2... Hopper, 3... Rotating shaft, 5... Casing, 8... Motor with electromagnetic brake, 11, 12... Vane, 13... Gate plate,
14...Scraper.

Claims (1)

[Claims] 1. A mixer in which band-shaped forward and return blades spiraling in the axial direction are attached to the outer periphery of a rotating shaft in the lateral direction within the casing, with the former located on the outside and the latter on the inside, A mixer characterized in that the outgoing blade is provided with the lateral gate plate close to the inner surface of the casing, and the gate plate extends over the entire length of the outgoing blade in the lateral direction when viewed from the front. 2. The mixer according to claim 1, further comprising a scraper made of a flexible material that slides on the inner surface of the casing and is provided on the outer edge of the gate plate. 3. Claim 1 or 2, characterized in that the casing is rotatable around the rotation axis.
Mixer as described.