JP2793995B2 - Raw material blending system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a raw material blending system, and more particularly to a raw material blending system used in the production of a ceramic plate requiring a raw material blending accuracy.

(Prior art) The raw materials for ceramic plates are as many as 4 to 8 types such as clay, talc, wollastonite, etc., and the compounding ratio is 30 to 50% than that of 10% or less.
They are close and various, and each must be weighed within an error of ± 2%. In particular, when manufacturing a large ceramic plate, the adjustment of the clay is important to obtain a uniform strength.

FIG. 5 is a diagram for explaining a conventional device, and the outline will be described with reference to FIG. As shown in the figure, a plurality of raw material supply bins (1-1, 1-2,... 1-n) corresponding to the number of raw materials.
Is fixedly provided, and the measuring tank 2 is movably provided below this. That is, wheels 3 are attached to the measuring tank 2, which move on rails 4 and stop below each raw material supply bin, and each raw material cut out here is fed to the mixer 6 via the belt conveyor 5. Fill and mix.

In addition to the above, there is also a type in which each raw material is supplied using a plurality of different feeders. At this time, a cotton-like fibrous raw material (wollastonite) is used as a raw material for producing a ceramic plate, but since this raw material is a raw material having a uniform mixing ratio with a powder raw material, it is necessary to use a final mixing machine. Filled and mixed here.

(Problems to be Solved by the Invention) In the above-described conventional apparatus, when the measuring tank is moved, the zero point maintenance is inaccurate due to the nature of the moving, and the measuring accuracy is easily changed. Further, in the case of using a feeder, the quantitative supply becomes unstable due to a time delay due to a difference in the length of the feeder and a change in the apparent specific gravity of the raw material.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a raw material blending system capable of supplying a raw material stably and accurately.

[Constitution of the Invention] (Means for Solving the Problems) In order to achieve the above object, in the present invention, a fibrous raw material is mixed with a plurality of powder raw materials, and water is further added and kneaded to form a ceramic plate. In the raw material blending system for obtaining kneaded material, a raw material supply bin filled with a powder raw material is arranged around a fixedly provided measuring tank, and a measuring screw feeder having an equal length between the raw material supply bin and the measuring tank is provided. The fibrous raw material was uniformly placed on the upper surface of the powder raw material measured in the measuring tank, transferred as a layer structure, and kneaded through a pre-mixing process.

(Operation) Each powder raw material is collected from each raw material supply bin into a measuring tank via an inclined screw feeder. At this time, since the lengths of the inclined screw feeders are set to be equal, the mixing accuracy is improved. The powdered raw material weighed here is placed in a layered manner on the way to the fiber raw material during the transfer, and reaches the pre-mixer. This pre-mixer has a configuration in which a rotor provided with magnet bars at equal intervals rotates, so that the transferred powdery raw material and fibrous raw material are sufficiently mixed, and at the same time, iron harmful to ceramic firing is removed. Then, the mixture enters the mixer and is kneaded to form kneaded clay.

(Example) Hereinafter, an example is described with reference to drawings.

FIG. 1 is a block diagram of an embodiment of a raw material blending system according to the present invention. In this embodiment, the number of raw material supply bins is two (1-1, 1-2) (see FIG. 2). Plan view).
That is, the raw material supply bins 1-1 and 1-2 are provided adjacent to each other, and the measuring layer 2-1 is disposed below each raw material supply bin. 7-1,7
-2 is an inclined screw feeder having an inclination angle θ
Is set to 40 ° to 60 °, and the top is opened on the upper surface of the measuring tank 2-1. And by minimizing the gap between the cylinder and the blade in the cylinder that covers the screw feeder, by increasing the screw pitch toward the discharge port,
I try not to flash. 8 is a belt conveyor, 9 is a pre-mixer, 6-1 is a mixer, 10 is a raw material supply bin filled with poorly miscible fibrous raw material (wollastonite), and 11 is a belt conveyor below it. 8 is a belt conveyor for transferring fibrous raw materials. In addition,
The pre-mixer 9 refers to a mixer at a stage preceding the mixer 6-1 and is for pre-treatment. FIG. 3 is a schematic view of the pre-mixer, which is shown as a side view of the pre-mixer with the wall plate removed. A rotor 9-1 rotates together with the shaft 9-2. A magnet bar 9-3 is attached to the rotor 9-1 at a predetermined interval around its periphery. Therefore, there is a gap between the bars 9-3, and the raw materials that have fallen from above as shown by arrows in the figure are sufficiently distributed and mixed. At this time, iron contained in the raw material is also removed.

 Next, the operation will be described.

Each of the raw material supply bins 1-1, 1-2,... Is filled with a required raw material powder, for example, clay, talc, or the like. The raw material (wollastonite) is filled. According to the start of operation, the raw material from each raw material supply bin is supplied to the screw feeders 7-1,7.
-2 is supplied to the measuring tank 2-1. The supply of raw materials to the measuring tank is controlled by controlling the number of rotations of the screw feeder to a limit of 90 to 95% of the predetermined measured value, and automatically stops by an electric signal when the specified value is reached. Therefore, accurate weighing is performed. If the specified weighing value deviates from the allowable set value, the control system automatically stops and issues an alarm. These weighing operations are performed according to a preset time chart.

As described above, the powder raw material having good mixing properties is weighed, and after arriving at the position where the fibrous raw material (silver gray) is supplied by the belt conveyor 8, the fibrous raw material is transferred to the upper surface of the transferred powder raw material. Send uniformly and transport as a layered configuration. Of course, the fibrous raw material is separately measured and crushed.

Then, the layered raw material is once supplied to the pre-mixer 9. In the pre-mixer, the rotor 9-1 provided with the magnet bars at equal intervals is already rotating as described in FIG. Therefore, the raw material sent from above is sufficiently stirred by the bar of the magnet of the rotor and then sent to the next mixer 6-1. At this time, iron harmful to ceramic firing is removed by the bar of the magnet. Further, the mixer 6-1 in the present invention performs not only a function of simply mixing the fed raw materials but also a kneading operation at the same time. That is, in the production of kneaded clay, it is necessary to uniformly disperse water at the same time as uniform mixing of the raw materials. The kneading operation for that is as follows. First, the raw materials supplied through the pre-mixer are mixed in a dry manner (without adding water) for a certain period of time (4 to 10 minutes). Via the predetermined time (3
Water for ~ 5 minutes). After the water supply is completed, it will be further
Mixing for 20 minutes produces a good quality clay.

The results of testing the ceramic plate manufactured according to the above example and that according to the conventional method were as follows.
The hardness test was based on Vickers hardness.

As is clear from the above test results, it is understood that the hardness of the sample of the present invention varies extremely depending on the test object. This means that when a large-area ceramic plate is made, the quality is improved as compared with the conventional product.

FIG. 4 is a block diagram of another embodiment of the present invention. In the present embodiment, four raw material supply bins (1-
1, 1-2, 1-3, 1-4) are provided, and other configurations are the same as those in FIG.

In the above embodiment, the number of the raw material supply bins is two or four.
Although described as being limited to one, there is no particular significance in limiting these numbers. The point is that if the raw material supply bins are arranged around the measuring tank and the lengths of the screw feeders are made equal, the mixing accuracy of the raw materials is improved accordingly.

[Effects of the Invention] As described above, according to the present invention, a raw material supply bin filled with a powder raw material is arranged around a fixedly provided measuring tank, and each of these raw materials is supplied to the measuring tank by an inclined screw feeder. After the fibrous raw material is placed on the upper surface of the weighed powder raw material and transferred, and then mixed through a pre-mixer, the mixing accuracy of each raw material is improved,
The powdery raw material and the fibrous raw material are mixed extremely well, and as a result, a flat ceramic plate with uniform strength can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of a raw material blending system according to the present invention, FIG. 2 is a plan view showing only a raw material supply bin arranged around a measuring tank, FIG. FIG. 4 is a block diagram of another embodiment, and FIG. 5 is a diagram showing a conventional apparatus. 1-1, 1-2 to 1-n: Raw material supply bin 2, 2-1: Measuring tank, 6, 6-1: Mixer 7-1 to 7-4: Screw type feeder 8, 11 …… Belt conveyor, 9… Pre-mixer 10 …… Raw material supply bin for fibrous raw materials

Claims (3)

(57) [Claims] 1. A raw material blending system for mixing a fibrous raw material with a plurality of powder raw materials, further adding water, and kneading the raw material to obtain a clay of a ceramic plate. A raw material supply bin filled with a powder raw material is arranged, the raw material supply bin and the measuring tank are connected by an inclined screw feeder having an equal length, and the upper surface of the powder raw material measured in the measuring tank is A raw material blending system, wherein a fibrous raw material is uniformly placed and transferred as a layer structure, and a kneading process is performed via a pre-mixing process. 2. The raw material blending system according to claim 1, wherein the pre-mixing process is performed by rotating a rotor having a magnet bar on the periphery. 3. The raw material blending system according to claim 1, wherein the inclination angle of the inclined screw feeder is 40 ° to 60 °.