JPH0343205A - Controlling method of mixture and apparatus therefor - Google Patents

Abstract

PURPOSE:To form a uniform mixed-state by putting a material into a stirring chamber, and reverse-rotating mutually multistage stirring blades, and then giving a stirring effect by the stirring blades rotating along the inner surface of the stirring chamber and also giving a stirring effect by the stirring blades provided on the center part thereof, furthermore giving the stirring effect of the mutual stirring blades. CONSTITUTION:Main stirring blades 3, 4 in a stirring chamber 8 are made oppositely in its inclined direction, and the drive to the main stirring blades 3, 4 is conducted by a driving mechanism 7. A bevel gear 16 and a bevel gear 17 on a rotating cylinder 18 mesh with a bevel gear on the driving mechanism 7 oppositely up and down, and they are driven in reverse direction. A first auxiliary stirring blade 5 rotating along the inner surface of the stirring chamber 8 and second auxiliary stirring blade 6 rotating at the central part thereof are provided, and the auxiliary stirring blade 5 rotates together with the main stirring blade 3, and also, the auxiliary stirring blade 6 rotates together with the main stirring blade 4. Either two kinds or other materials of powder, solid grains and liquid are given compositely a stirring effect by the main stirring blades 3, 4 in the stirring chamber 8 and stirring effect by the auxiliary stirring blades 5, 6, thereby repeating always effective stirring effects without cease.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention The present invention relates to a method and apparatus for preparing a mixture, and is suitable for preparing a mixture of powder, granules, and liquid, such as a cement mixture such as mortar or concrete. It is an object of the present invention to provide a method and an apparatus therefor, which can efficiently perform agitation adjustment and form a uniform and excellent mixed adjustment state within a relatively short period of time.

(Industrial application field) Mortar or concrete using two or more of hydraulic substance powder such as cement and other powders, granular materials such as aggregates such as sand, and liquids such as water. Techniques for preparing kneaded materials and other mixtures.

(Prior Art) Various methods have been used for a long time to adjust the mixing ratio of mortar or concrete using hydraulic substance powder such as cement, aggregates such as sand, and water. Similar efforts have been made to mix mixtures of powders or granules with liquids, and in particular the mortar or concrete mentioned above requires a large amount and is difficult to handle in today's world where homogeneity is required.
The main method is kneading by.

In addition, in obtaining the above-mentioned kneaded material such as mortar or concrete, a predetermined amount of water (primary water: Wl) is uniformly applied to the surface of fine aggregate such as sand. The present inventors have confirmed that a stable shell can be formed on the surface of the fine aggregate by adding and kneading cement powder in this state, and the remaining water ( By adding secondary water and kneading again (referred to as the split kneading method), there is less breathing than in the conventional general method of simply kneading using the same blended water (referred to as the 9-pass kneading method). JP-A-55-104952 discloses that the kneaded product has good workability and can improve the strength and other properties of the product obtained by using the kneaded product.
(Special Publication No. 63-13956), etc.

Furthermore, recently, it has been pointed out that it is necessary to thoroughly mix the mixed material, and in particular, the higher the strength of concrete with a low cement ratio, the more sufficient mixing is required. It was announced in ``Concrete Engineering Annual Papers 9-IJ (published on June 12, 1988), 121-126, that it is difficult to develop sufficient strength with the normal mixing time. Part 122
In Figure 2 on page 2, it is said that as a kneading characteristic of the forced kneading mixer, by taking a kneading time of about 300 seconds or more, compressive strength and breathing rate can be lowered, and their standard deviations can be made small.

It goes without saying that even when mixing two or more of various powders, granules, and liquids other than those mentioned above, it is important to form an even mixed state, and various efforts have been made to achieve this mixing. There is.

(Problem B to be solved by the invention) Since the above-mentioned kneaded products using cements are used for civil engineering and construction purposes, large quantities are required, and the kneading equipment is also gradually becoming larger. Even if such a large amount of kneaded material were to be prepared, it is obvious that it would be difficult to apply a long mixing or kneading operation, as is the case in the production of specialty chemical products, for example. In other words, in the case of civil engineering or construction use, it is necessary to make the adjustment as quickly as possible, and JIS standards stipulate kneading for a short time of about 60 seconds at most. There are large variations in this type of kneaded material that has been carried out, and it is not necessarily desirable in terms of quality such as pleating, slump value, or compressive strength of the product obtained. The results of practical studies on kneading equipment have been announced. In particular, in the case of the divided kneading method developed by the present inventors, a relatively small amount of constant moisture is evenly deposited on the sand, which is the raw material, and a similar adhesion coating state is created over the entire surface of the sand particles. If the water adhesion state of the sand particles is not formed, the shell-forming state will become uneven and unstable, which will inevitably affect the properties of the kneaded product, and further affect the kneaded product. The strength properties and other properties of the product obtained using this method are also insufficient.

Therefore, in order to adjust such sand, it is required to adopt a water landing adjustment technique that utilizes special vacuum conditions, or a water landing adjustment process called a sand controller that uses centrifugal force or impact force. Ru. However, it is clear that such adjustment of water adhesion on the surface of sand requires a mechanism separate from the mixer for obtaining the above-mentioned kneaded material, which requires special equipment, its operating cost, and processing time. shall be. The process under vacuum conditions involves first applying hot water to the sand grains housed in a container under conditions where the pressure is reduced to remove the air on the surface of the sand grains, and then after sufficiently adhering water, the reduced pressure conditions are established again to dehydrate the sand grains. However, it is clear that a considerable amount of processing time is required to achieve a moderate adhesion state. On the other hand, a sand controller that uses impact force deposits a certain amount of excess moisture and then dehydrates it by impact force, forming a coating state proportional to the impact force, so a large amount can be processed at one time. In addition, there are disadvantages such as significant wear and tear on the N unit due to impact friction.

Incidentally, even if long-time kneading is preferable for the preparation of the kneaded material, such continuous kneading over a long period of time increases operating costs and also increases wear and tear on equipment.

Furthermore, in the case of the above-mentioned dividing line mixing, it is not necessarily easy to manage the preferable primary mixing conditions, or to manage the slump value and other characteristics by secondary mixing, or the appropriate mixing time. In addition, in this parting line mixing, the bulk is obtained during the first kneading with a small amount of water, whereas the bulk is greatly reduced during the second kneading with the addition of secondary water. Under conditions where the volume changes over time, there is a tendency that secondary kneading cannot necessarily be carried out properly if the stirring blade is in a state suitable for primary kneading (the position of the blade in the stirring chamber).

Even when obtaining mixtures using powders, granules, and liquids other than mortar and concrete, it is difficult to obtain a uniformly mixed state, and especially when obtaining a mixture using powders and liquids, the liquid may be A phenomenon occurs in which the material is preferentially adsorbed in some areas, and a state in which the mixing effect on the material is not uniformly applied to the material as a whole, making it difficult to form an even mixing state in general.

"Structure of the Invention" (Means for Solving the Problems) 1. When mixing two or more materials of powder, solid particles, and liquid, stirring blades move the materials to be mixed in multiple stages. The multistage stirring blades described above are rotated in opposite directions, and the stirring action is performed by the stirring blades that rotate along the inner surface of the stirring chamber, and the stirring blade provided in the center of the stirring chamber performs stirring. A method for preparing a mixture, characterized in that the stirring blades provide mutual stirring action.

2. In order to obtain a mixture using a powder such as cement, a granular material such as aggregate, and a liquid such as water, a part of the above-mentioned granular material and liquid is mixed with stirring blades arranged in multiple stages. The multistage stirring blades described above are rotated in opposite directions, and the stirring blades rotate along the inner surface of the stirring chamber, and the stirring blade provided in the center of the stirring chamber also provides a stirring effect. Then, the powder is added to the same stirring chamber and the stirring action of the stirring blades is applied to each other, and the liquid is evenly deposited on the surface of the granular material. A method for preparing a mixture, which comprises charging the remaining liquid and necessary additives, and also imparting a stirring action by mutual stirring blades.

3. A plurality of rotating shafts are arranged vertically in the center of the stirring chamber, which has a circular horizontal cross section, and main stirring blades symmetrical in the direction of inclination are attached to the rotating shafts, respectively, and the inner circumferential surface of the kneading chamber is A first auxiliary stirring blade that rotates along the axis and a second auxiliary stirring blade that rotates on the side of the rotating shaft are arranged, and a rotational drive means is provided for imparting rotation in the opposite direction to each of the rotating shafts. A mixture adjusting device characterized by:

(Function) By the multi-stage stirring blades rotating in opposite directions, the materials to be mixed in the well mixing chamber, which are two or more of powders, granules, and liquids, are moved in relatively opposite directions, Efficient mixing action is obtained between the materials moving in opposite directions.

During the above-mentioned mixing operation, there is a general tendency for the charged material to be discharged to the inner surface or center of the stirring chamber; The charged material is scraped off by the stirring action of the stirring blade rotating along the inner surface of the stirring chamber and the stirring action of the stirring blade installed in the center of the stirring chamber, and is pushed out to the middle part of the stirring chamber. prevent material from accumulating. In addition, the stirring action of the stirring blades along the inner surface of the stirring chamber and the central stirring blade is added to the stirring action of the opposite-direction stirring blades in the middle, thereby improving the overall stirring efficiency within the stirring chamber.

When particles such as particles are present in the material, the granules in the charging material that are stirred and moved in relatively opposite directions as described above are present in the material and can be used for effective rolling action. Also, under the combined conditions of the stirring action of each stirring blade on the inner surface and center of the stirring chamber, the above-mentioned combined rolling action is applied to all the charged materials in the stirring chamber, and the liquid or powder is applied to the surface of the granules. To efficiently obtain contact adhesion of one or both of the above and to stabilize the adhesion state.

Furthermore, as a result of the above-mentioned results, a uniform and good mixing state can be achieved within a short time, and even in the case of a kneaded product, a good line-up state can be achieved.

In the case of dividing lines to obtain a cement mixture, the mixing operation of part of the liquid with part of the granular material such as fine aggregate creates a uniform state of liquid on the entire surface of the granular material due to the stirring action accompanied by the above-mentioned transfer. A state of adhesion and coating is established within a relatively short period of time, and in this state, cement powder is charged and stirring is continued for 1 time to achieve safe adhesion of the cement powder to the surface of the granules as primary kneading, Subsequently, the remaining water and necessary additives are added and stirred to obtain the desired kneaded product as secondary kneading. In other words, there is no need for separate equipment that utilizes special vacuum conditions or impact effects in order to uniformly apply liquid to fine aggregate, etc., and the process can be completed within a short time using a consistent stirring and mixing operation using only a single mechanism, the ξ mixer. In addition, a considerable amount of material is required to be divided.

Multiple rotating shafts are arranged vertically in the center of the stirring chamber, which has a circular horizontal cross section, and main stirring blades with symmetrical inclination directions are attached to each of the rotating shafts, so that each rotating shaft rotates in the opposite direction. The main stirring blade is rotated in the opposite direction by providing a rotational drive means to give a rotational drive.

The first auxiliary stirring blade stirs along the inside of the stirring chamber, and the second
The auxiliary stirring blade stirs the rotating shaft side in the center of the stirring chamber.

(Example) To explain the specific embodiment of the present invention as described above, the present inventors have repeatedly studied how to solve the problems in the prior art as described above, and have developed a mixture as described above. It has been found that it is advantageous to use certain complex agitation systems for the preparation of concrete, i.e. in cement mixtures, whether mortar or concrete, aggregates such as sand or gravel are incorporated. In view of this, efficient kneading can be achieved by forcing the mixed aggregate to move in the opposite direction or kneading under strong shearing force conditions. It was confirmed that uniform agitation and mixing could be obtained for all materials by combining the various agitation methods.

In other words, it is clear that even with general stirring and kneading by rotating the stirring blade in one direction, the materials to be kneaded are moved within the stirring chamber and are kneaded with a certain amount of shear force acting on them, but in this case, the materials are kept stationary. The material to be kneaded has a strong tendency to be simply moved in one direction by the stirring blade as an aggregate, and the material to be kneaded slightly overflows on both sides of the rotation range of the stirring blade between the material to be mixed and the material to be mixed in a stationary state. Only a slight amount of rolling due to shearing force or movement of the aggregate mixture is obtained, and the direction is essentially unidirectional.

On the other hand, if multiple stages of stirring blades are used in the vertical or radial direction, and the inclination direction is opposite between each stage, and the stirring blades in each stage are rotated in relatively opposite directions, For example, the moving direction of the mixed material moved by the rotation of the stirring blades in each stage is relatively opposite, and a significantly large shearing force acts on the mixed material near the boundary between each stage. Moreover, as a result of acting forces acting in opposite directions upward and downward on the granular material near the boundary, the rolling action of the granular material obtained by these acting forces is also accurately obtained, so that the kneading effect on the material to be mixed is improved. It will be given to a high degree. As a result of this action, the adhesion state of the liquid on the surface of the granular material and the powder via the liquid becomes strong and stable, and in this way, for example, a product or a product made of the stabilized adhesion state of cement or paste. The modeled object has excellent compressive strength and other properties.

However, during such stirring operations, the material inside the stirring chamber is generally discharged to the inner surface of the outer wall of the stirring chamber (hereinafter referred to as the "stirring chamber inner surface") or to the center of the stirring chamber due to the action of the stirring blades. There is a strong tendency for the materials collected to stagnate in each part. In other words, it was confirmed that even if favorable results were obtained as described above in the area appropriately affected by the stirring blades, favorable mixing results tended not to be obtained in the interior and center of the stirring chamber as described above. In order to eliminate this phenomenon, the present invention uses a stirring blade that rotates along the inner surface of the stirring chamber and a vertical stirring blade that rotates in the center of the stirring chamber for stirring. Even if the vertical stirring blades on the inner surface and center of the stirring chamber have different characteristics from the horizontally symmetrical stirring blades described above, they may be rotated by the same means. However, in order to obtain a favorable effect for each condition with regard to the vertical stirring blades, it is necessary to adopt a separate drive means, even if the mechanism is slightly complicated, and take measures such as increasing the rotational speed of the central stirring blade. It is preferable to do so.

The outline of the device according to the present invention as described above is shown in FIGS. 1 and 2.
As shown in the figure, upper and lower main stirring blades 3.4 are coaxially arranged in a stepped manner in a stirring chamber 8 provided on a mechanism 10, and these main stirring blades 3.4 have opposite inclination directions. The main stirring blades 3 in the upper stage are inclined downward, whereas the main stirring blades 4 in the lower stage are inclined upward. These main stirring blades 3.4 are driven by a drive mechanism 7 such as a motor provided in the mechanism 10, but the drive system is separately shown in FIG. A bevel gear 16 provided on the central shaft 11 and a bevel gear 17 of a rotary cylinder 18 rotatably assembled coaxially with the central shaft 11 via a bearing 19 are vertically opposed to the bevel gear 15. These central shafts 11
The main stirring blades 3 and 4 are attached to attachment portions 13 and 14 of the rotary cylinder 18.

In addition, in this structure, the present invention further includes a first auxiliary stirring blade 5 that rotates along the inner surface of the stirring chamber 8 whose horizontal cross section is circular, and a second auxiliary stirring blade 6 that rotates in the center. In the illustrated example, an auxiliary stirring blade 5 is provided to rotate together with the above-mentioned main stirring blade 3, and an auxiliary stirring blade 6 is provided to rotate together with the main stirring blade 4. That is, as the auxiliary stirring blade 5 rotates along the inner surface of the stirring chamber 8, the material is discharged to the outside of the rotation area by the rotation of the main stirring blade 3.4 as described above, and adheres to the inner surface of the stirring chamber 8 and tends to stagnate. The auxiliary stirring blade 6 scrapes the material and pushes it out to the middle part of the stirring chamber 8 while stirring, and the auxiliary stirring blade 6 also scrapes the material that is discharged to the center of the stirring chamber 8 and tends to stagnate. The material in the stirring chamber 8 is produced by a combination of the stirring action by the main stirring blade 3.4 and the stirring action by the auxiliary stirring blades 5.6 as described above. Moreover, it is advisable to always repeat an effective stirring action without causing any partial stagnation on all materials in the stirring chamber.

In addition, in the stirring chamber 8 having a certain size, the upper and lower main stirring blades 3 and 4 as described above are provided with different radial phases from the central axis 11 as necessary. Those on the center side and those on the outer periphery are placed alternately, and in some cases, those located midway between the center side and the outer periphery are used, and their main stirring blades 3°4 are arranged in the radial direction. By using relatively short and small ones, the resistance during rotation of each main stirring blade 3.4 is made equal to that of the auxiliary stirring blade 5.6, and the resistance when the main stirring blade rotates and stirs due to the above-mentioned configuration is reduced. It is possible to level the mixture and to provide a uniform stirring effect throughout the stirring chamber 8. A gate 1 for discharging the mixture is provided on one side of the stirring chamber 8. A cylinder 2 is attached to the gate 1, and the mixture after a predetermined mixing is discharged through the discharge chute 1 by opening the gate 1.
It is admonished to be taken out from a.

The invention as described above can be implemented separately as shown in FIG. 3.4. That is, the main stirring blade 3
．． The use of the main stirring blades 3.4 and the auxiliary stirring blades 5.6 is similar to that shown in FIG. In the same state, the main stirring blades 3 and 4 are both located in contact with the bottom surface of the stirring chamber 8. In other words, in this case, the main stirring blades 3.4 are arranged in multiple stages in the radial direction of the stirring chamber 8. However, such a main stirring blade 3.
4, auxiliary stirring blades 5.6 are arranged in the same way as in the case of Fig. 1.2, and each stirring blade is driven to rotate in the opposite direction, and the stirring chamber is Even if there is a certain difference in the movement or stirring behavior of the material within 8, basically the same stirring and mixing effect can be obtained.

Main stirring blade 3.4 and auxiliary stirring blade 5 as described above
, 6, as shown in FIG. 5, a multi-stage bevel gear 15a is mounted on the motor drive shaft.

15b and by engaging the bevel gears 16.17 with these bevel gears 15a, 15b, the rotational speed or torque of one or both of the stirring blades 3, 4 and 5.6 as described above can be changed. It can be used as a gift. In some cases, the stirring blades 3 and 4 may be driven by separate motors, and the drive speeds of the separate motors may be individually varied to quickly respond to the mixing conditions of each material to be kneaded, thereby achieving efficient kneading. can be made.

In the device shown in FIG. 1.2 or FIG. 3.4, by adopting the drive configuration as shown in FIG. 5, the relative rotational speed of each stirring blade can be changed, that is, the stirring chamber The rotational speed of the stirring blade 4.6 located at the center of the stirring chamber 8 is set higher than that of the stirring blade 83.5 near the inner surface (outside) of the stirring chamber 8, and the rotational speed (peripheral speed) is appropriately balanced for rotational stirring. conditions can be formed. In other words, due to the balanced rotational stirring conditions as described above, the material in the stirring chamber 8 receives an accurate stirring and mixing effect without bias, and it is possible to achieve efficient mixing and consistent mixing or kneading results within a short time. can.

Furthermore, as shown in FIG. 6, the above-mentioned main stirring blade 3 is attached to an elevating tube 21 attached to the central shaft 11 via a mounting portion 13, and the elevating tube 21 is attached to an adjusting seat separately attached to the central shaft 11. 22 through an elastic material 23 and guide means 24, the interval between the main stirring blade 3 and the main stirring blade 4 attached to the mounting portion 14 of the rotary cylinder 18 can be elastically varied. In particular, the spacing and covering of the main stirring blades 3 and 4 may be adjusted so that the main stirring blades can be kneaded without damaging the main stirring blades due to a change in particle size of coarse aggregate or without applying a large torque change. There is a large practical relationship between the maximum diameter of the aggregate in the kneaded material, that is, the interval between the main stirring blades 3 and 4 should be at least 2.5 times or more, preferably 3 times or more, the maximum diameter of the aggregate. It is important to achieve mixing with less wear and tear.On the other hand, in order to increase the mixing efficiency, it is undesirable to make the interval between the main stirring blades 3.4 excessively large. 10
Since it should be less than 5 times, preferably 5 times or less, the main stirring blade 3 depends on the maximum diameter of the aggregate in the material to be kneaded.
．． The spacing adjustment settings between the four spaces are changed as appropriate, as shown in FIG. 7 in comparison with FIG. 6, and are appropriately selected depending on each case.

As mentioned above, in the case of following the split line method developed by the present inventors, the mixing chamber is The apparent volume of the kneaded material in the container 8 is quite bulky, approximately twice the volume of the mixture obtained by simply adding cement to surface-dried fine aggregate and coarse aggregate, or in some cases 2
．． The apparent value of 5 times indicates the volume. In other words, cement powder was adsorbed and coated on the peripheral surface of the aggregate particles, resulting in an enlarged diameter state, and the cementitious coating to which such diameter-enlarged aggregates adhered was used as a binder to bind them, and large voids were formed between each of the aggregate particles. However, the kneading by the main stirring blades 3 and 4 as described above is extremely effective for kneading the materials to be kneaded in such a state, and the above-mentioned transfer Since the bonding is done at a point, it can be obtained very efficiently, advantageously promotes the entire circumferential coverage of the cement powder on the aggregate particles, and stably strengthens the covering layer. In addition, in such primary kneading, the kneading torque increases as the kneading progresses, but when the optimum primary water l (Wl/C) is reached, the torque value (specifically, the power value of the mixer) increases. ) is the maximum, and if W, /C is lower or higher than this, this power value is low, and this is the optimal W + /c
This indicates that cement is most efficiently adsorbed and kneaded into wet aggregate (mainly fine aggregate) when the By using the main stirring blade 3.4, it becomes clearer and the optimum WI/C can be easily managed during this primary kneading.

Furthermore, in the case of secondary kneading using secondary water (W2) after the above-mentioned first kneading, when conventional mixing equipment is adopted, the volume of the bulky material to be kneaded is added as described above. The secondary water increases the slippage or fluidity at the joint, so the kneading torque gradually decreases and the power value decreases, but the stable range of the secondary kneading power value obtained in this way is There is a significant relationship with the flow value and slump value of the mixed material, and the fluidity or formability of the kneaded material can be controlled in the stable range of the secondary kneading power value. As for flow value management, preferable precision can be achieved by using the main stirring blade 3.4 as described above. In any case, preferred primary kneading and secondary kneading can be achieved, and appropriate mixing time can be managed to rationally perform parting line mixing and obtain its effects appropriately.

However, the auxiliary stirring blade 5 in the present invention is not suitable for such volume changes during the primary kneading and secondary kneading of the materials to be kneaded.
．． 6 has a preferable buffering effect.

In other words, during the primary and secondary kneading operations as described above, the auxiliary stirring blade 5.6 pushes the material to be kneaded from the inside and outside into the stirring rotation range of the main stirring blade 3.4. Such auxiliary stirring blades 5,
Although the bulkiness (apparent volume) is unlikely to be increased even by the action of 6, the bulkiness is restored by the action of the auxiliary stirring blades 5 and 6 during the secondary kneading, where the volume is greatly reduced. This will have the effect of In other words, it is clear that the volume tends to increase due to the material being pushed back from the inside and outside, and this means that when the primary and secondary kneading are carried out using the same conventional mechanism, the main stirring impeller as shown in Figure 1.2 If 3.4 are installed vertically opposite each other, the upper stirring blades will not function sufficiently due to volume reduction during secondary kneading, and if main stirring blades 3 and 4 are installed at the same level. In this case, the reduction in efficiency due to a decrease in the load on the upper part of the main stirring blade (increase in the load on the lower part) is alleviated to some extent by restoring the bulkiness of the main stirring blade. In addition, the restoration of bulk during secondary kneading makes the material dense and fluidity decreases, which also alleviates the increase in torque during stirring.
Achieve the following consistent kneading.

In addition, regarding each stirring blade 3 to 6 according to the present invention,
It is preferable to change the rotational speed as appropriate depending on the mixing and crosstalk conditions, and to achieve this purpose, a plurality of drive mechanisms 7a and 7b can be employed as shown in FIGS. 8 and 9.

That is, as an example, in the structure shown in FIGS. 3 and 4, by employing a plurality of driving mechanisms 7a and 7b, the rotation of the inner stirring blade 34.36 with respect to the outer stirring blade 33.35 is reduced. It is generally possible to increase the number of rotational speeds (peripheral speeds), and it is possible to have a balanced stirring action or to change one of them from the other in terms of rotational speed (peripheral speed). Accordingly, truly desirable and advantageous effects can be appropriately realized under each stirring and mixing condition.

Mixing and kneading examples concretely carried out using the apparatus of the present invention as described above will be described below, along with comparative examples using conventional methods.

Mixing Example 1 In an apparatus as shown in Fig. 8.9, a drive system from a prime mover as shown in Fig. 5 was employed to carry out mixing for the purpose of coating river sand with surface water.

That is, 200 kg of river sand was charged into the stirring chamber 8, which had a diameter of 1200+n and a height of 80 on, and 141 kg of water was added, and each stirring blade f! 133-36 stirring blade 33.35
The stirring process was performed by rotating a stirring blade 4.6 at 58 rpm at 25 rpm.

On the other hand, as a comparative example, a commercially available forced kneading ξ mixer using 14 stirring blades was used, the same river sand and water with the same <141 ratio were added, and stirring and mixing was carried out at a rotational speed of 60 rpm.

In each stirring/mixing process, the stirring chamber 8 is
Samples were taken from the upper and lower parts of the tank, respectively, and the amounts of adhering water in these samples were measured. The results are summarized in Table 1 below.

In other words, the sample according to the present invention showed a very small deviation value σ7 of 0.08% at the third sampling (15 seconds after the start of stirring), which can be said to be a sufficiently equalized moisture adhesion state. . On the other hand, the deviation value of the comparative example is σ7 or 0.16% even at the 10th sampling (50 seconds after the start of stirring), which is quite high. There is a phenomenon in which the deviation value becomes higher than the previous one, and this deviation value cannot necessarily be made appropriate.Those with such dispersion in the amount of attached water are not the same as the above-mentioned dividing line developed by the present inventors. However, when this method is used, the adhesion of cement powder is incomplete.

It is recognized that the difference in the average value X between the inventive example and the comparative example is due to fluctuations in the amount of water attached to the charged river sand itself.

Mixing example 2 (normal mixing) Cement 251kg/rrr, sand 834kg/n? , gravel 1064kg/rrr, water 160.85kg/n? ,
Admixture (Hozolith Nn10) +r/rr to 1.65?
[Water-cement ratio: 64.7%, sand-to-coarse aggregate ratio (S/a): 44.6%] A kneaded product using the method of the present invention (Aim 1 to Hiroshi 3) with three stages of kneading time of 45.50 seconds and 55 seconds after being charged into an apparatus, and a kneaded product with a kneading time of 60 seconds using a conventional forced pan-type mixer. (M4)
I got this.

The results of testing and measuring the kneaded state of these kneaded products are shown in Table 2 below.

In other words, it was confirmed that even with Ml with a kneading time of 45 seconds, the product according to the present invention has a line-up state equivalent to that of a conventional forced mixer with a kneading time of 60 seconds. By doing so, N[14
It was confirmed that the line rise characteristics were better than those of the comparative example.

Mixing Example 3 A kneaded product according to the present invention and a comparative example were obtained by mixing at a dividing line. The mixer used was the same as that described in Mixing Example 2, and the blending relationship of the kneaded product was also the same as in Mixing Example 2, except that river sand with 5.7% surface adhesion water from Mixing Example 1 was used. However, according to the dividing line mixing method developed by the present inventors, the primary water (Wl) was 30 m! /n? After kneading was carried out using the following water, the remaining secondary water (W2) was added for secondary kneading.

In both the inventive product (fbl~11k14) and the comparative example (fish 5), sand, gravel and primary water were used for constant mixing for 15 seconds, then cement was added and primary kneading was carried out. Then, secondary water and an admixture (Hozolith NQ70, the same as in Kneading Example 1) were added and kneaded for a second time.
The secondary kneading and secondary kneading times were as shown in Table 3 below, with the shell forming time of the primary kneading being varied, and the secondary kneading taking a constant time.

Table 4 The results of measuring the line rising condition of each of the obtained concretes are as shown in Table 4 below.

In other words, although the N11O material of the present invention with a shell-forming kneading (primary kneading) time of 15 seconds has a slightly higher air content and a higher breathing rate, overall it is not as good as the first kneading of Comparative Example 5. 3
It is clear that the kneading state that required 5 seconds was substantially the same, and that of Aims 2 to 5, which required a longer primary kneading time, were Comparative Example 11h5.
The line is now in better condition. Primary kneading time is 2
It can be said that the highest level of kneading has already been achieved in the case of N11L3, where the mixing time was 5 seconds, and in the case of N4, where the primary mixing time was increased by 10 seconds and the primary mixing was performed for 35 seconds. However, there is little improvement in the line-up condition beyond that.

However, it is clear that the primary kneading time for Nll and Aim 2 is about half that of Comparative Example 11h5, and the required power value for this primary kneading is based on the above-mentioned circumstances. At the start, it is already higher than the required power value for the secondary kneading, - more than twice the required power value for the secondary kneading in boat fishing (higher at the peak point), and this primary kneading time is as described above. Reducing it by half and gaining it is extremely meaningful. Of course, as described above, it is possible to obtain a kneaded state better than that of the comparative example in a short time, and it is extremely useful industrially. In this example, the secondary kneading time was kept constant, but since the kneading effect of the present invention is great, it goes without saying that the secondary kneading time can also be shortened to some extent.

Mixing Example 4 Sintered metal raw material powder was mixed in the same manner using the apparatus of the present invention as shown in FIG. 1 and the mixer of the comparative example.

That is, 60 parts by weight of commercially available iron powder of 100 mesh or less, 40 parts by weight of similarly mesh copper powder, and 2 parts by weight of graphite powder were charged into a stirring chamber for 80 seconds in the case of the device of the present invention, and in the comparative example using the commercially available mixer. The mixture was stirred and mixed for 80 seconds.

The raw material powder of the obtained mixture was compacted at a pressure of 2.5 ton/c+ (to form a bearing body with an outer diameter of lOO12 and an inner diameter of 41), which was then sintered in a reducing atmosphere at 900°C for 50 minutes, and then sized. A product with a porosity of about 20 vol.

We randomly selected 100 samples of each of these products and measured their radial crushing strength (kg/mmz), and determined the average value and variation range.The results showed that the average value of the product mixed with the mixer according to the present invention was higher than that of the comparative example. 1 than that of
．． 5kg/mm! In addition, within the range of variation, the + side is 0.3 kg/, N2 is low, and the - car side is 2
．． It was confirmed that the weight was about 1 kg/x*'' and that the quality was stable.

"Effects of the Invention" According to the present invention as explained above, efficient cross-talk can be carried out within a relatively short period of time, a favorable kneaded state can be formed, and a particularly advantageous cross-wire product can be obtained. There is no need to adjust the water adhesion of fine aggregate using special equipment that uses vacuum conditions or impact force for things like parting lines, and a single mixer can perform this surface adhesion adjustment and primary and secondary mixing. It is an invention that has great industrial effects, as it has the effect of being able to carry out the process consistently, achieving these effects, as well as enabling accurate management of each process and ensuring proper operation.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and FIG. 1 is a plan view showing an example of a kneaded material adjusting device in the present invention;
Fig. 2 is a partially cutaway side view, and Fig. 3 is another implementation B.
4 is a cutaway side view thereof, FIG. 5 is a side view of the stirring blade drive mechanism portion, FIG. 6 is a sectional view of the interval adjustment mechanism for the main stirring blades installed oppositely, and FIG. 7
8 is a plan view of still another embodiment of the present invention, FIG. 9 is a side view thereof, and FIG. FIG. 2 is an explanatory diagram of the sample pump position in the stirring chamber regarding a mixing example of the present invention and a comparative example thereof. However, in these drawings, 3 and 4 are the main stirring blades, and 5
．． 6 is an auxiliary stirring blade, 7.7a, 'yb is a driving mechanism, 8
10 is a stirring chamber, 10 is a mechanism, 11 is a central shaft, 13.14 is a mounting part, 18 is a rotating cylinder, 21 is an elevating cylinder, 22 is an adjustment pressure, 2
3 is an elastic material, 24 is a guide means, 33.35 is an outer stirring blade, and 34.36 is an inner stirring blade. Patent applicant Ripgon Engineering Co., Ltd. Inventor Ito Endebu Doji Toji R Yuki Tagawa Tadaaki Tamura Do Hagiwara Dodai Kokugo En 7 Hara Do Hakusho Dai En Reiken 7 Haru JO Reika I Yuki ni 4 Figure 〆Figure procedure amendment (formula u-1, 11, -m9 day

Claims (1)

[Claims] 1. When mixing two or more of powder, solid particles, and liquid, the materials to be mixed are placed in a stirring chamber in which stirring blades are arranged in multiple stages. The above-mentioned multistage stirring blades are rotated in opposite directions, and the stirring blades rotate along the inside of the stirring chamber, and the stirring blade provided in the center of the stirring chamber also provides a stirring action. A method for preparing a mixture characterized by imparting mutual stirring action. 2. In order to obtain a mixture using a powdery material such as cement, a granular material such as aggregate, and a liquid such as water, a part of the above-mentioned granular material and liquid is mixed with stirring blades arranged in multiple stages. The multistage stirring blades described above are rotated in opposite directions, and the stirring blades rotate along the inner surface of the stirring chamber, and the stirring blade provided in the center of the stirring chamber also provides a stirring effect. Then, the powder is added to the same stirring chamber and the stirring action of the stirring blades is applied to each other, and the liquid is evenly deposited on the surface of the granular material. A method for preparing a mixture, which comprises charging the remaining liquid and necessary additives, and also imparting a stirring action by mutual stirring blades. 3. A plurality of rotating shafts are arranged vertically in the center of the stirring chamber, which has a circular horizontal cross section, and main stirring blades symmetrical in the direction of inclination are attached to the rotating shafts, respectively, and the inner circumferential surface of the kneading chamber is A first auxiliary stirring blade that rotates along the axis and a second auxiliary stirring blade that rotates on the side of the rotating shaft are arranged, and a rotational drive means is provided for imparting rotation in the opposite direction to each of the rotating shafts. A mixture adjusting device characterized by: