JPH044030A - Intimate mixing device for powder and grain - Google Patents

Abstract

PURPOSE:To execute efficient intimate mixing by providing a rotary disk which can idle, one set of pressing rollers which are disposed to face each other to come respectively into contact with both disk surfaces and have the axial directions oriented in the radial direction of the rotary disk and are driven by motors, and a premixing device. CONSTITUTION:The spacings (a) between the rotary disk 1 and the pressing rollers 3, 4 are properly adjusted by a handle. Variable speed motors 19, 20, 25 are driven to regulate the pressing rollers 3, 4 to the rotating speed suitable for the raw materials to be intimately mixed, by which plural kinds of the raw materials are supplied at prescribed ratios to the premixing device 5. The premixed raw materials are dropped dividedly to the spacings (a), (a) between the rotary disk 1 and the pressing rollers 3, 4 and induced to the spacings (a), (a) while the pressing rollers 3, 4 rotate. The rotary disk 1 rotates in follow up thereto as well. The circumferential speed in the circumferential direction of the disk surface 6 of the rotary disk 1 is increased the nearer toward the outer periphery. The circumferential speeds on the outer peripheral surfaces of the pressing rollers 3, 4 are uniform over the entire length in the axial directions thereof. The raw materials which are to be intimately mixed and are withdrawn into the spacings (a) are not only extruded by receiving strong pressures but also subjected to complex relative motions by receiving twisting effects.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention is suitable for use, for example, in applying a coloring material to the surface of granular ceramic raw materials for tile production. , relates to a roller type powder mixing device.

(Prior art) Conventionally, for example, in order to produce a tile with a spotted pattern, a granular ceramic raw material with a powdered coloring material coated on the surface was first prepared, and then multiple types of colored granular ceramics of different colors were made. The method used was to mix raw materials, press-form them into tiles, and then fire them.

In order to coat the granular ceramic raw material with the coloring agent, conventionally, the granular ceramic raw material and the coloring agent made into a slurry by adding water were mixed in a drum equipped with stirring blades, such as in a concrete mixer. It depends on the method of mixing.

(Problem to be Solved by the Invention) However, according to the above-mentioned conventional method, the coloring agent in the form of a slurry penetrates deeper than necessary into the innermost part of the porous granular ceramic raw material when viewed microscopically. However, this resulted in a problem that the expensive coloring material was wasted.

Furthermore, when press-molding the granular ceramic raw material into the shape of a tile, excess moisture is squeezed out into the mold, resulting in defective molded products.

Therefore, it is possible to mix the coloring material into the powder or granular ceramic raw material and apply it, but with this method, the coloring material is simply sprinkled on the surface of each particle, ensuring that the required amount of coloring material is applied. It was not possible to make it adhere to the surface.

Furthermore, since the granular ceramic raw material is porous and has a small bulk specific gravity, the degree of compaction during firing of tiles tends to vary, resulting in many defective products.

Therefore, an object of the present invention is, for example, when mixing a coloring material into granular ceramic raw materials, to ensure that an appropriate amount of the coloring material is applied to the surface of each particle, and at the same time,
The structure of the porous granular ceramic raw material is made denser, and
It is an object of the present invention to provide a mixing device for powder and granular materials that is configured to be able to extremely efficiently mix general raw materials other than those used in the above-mentioned cases.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, the powder/grain material mixing device according to the present invention includes a rotary disk having a predetermined diameter and arranged to be rotatable. 1, a pair of pressure rollers 3 and 4 which are arranged opposite to each other so as to be in contact with both plate surfaces 6.6 of the rotary disk 1, and whose axial directions are oriented in the radial direction of the rotary disk 1; Motors 19 and 20 that drive the pressure rollers 3 and 4; and a premixing device 5 that premixes a plurality of types of raw materials to be mixed and supplies the mixture between the rotary disk 1 and the pressure rollers 3 or 4. The configuration has three components.

It is preferable that a gap a is provided between the rotary disk 1 and the pressure roller 3 or 4, and that the interval of the gap a is adjustable.

Further, it is preferable to attach flanges 26 and 27 to the end face of the pressing roller 3.4 to prevent the raw materials to be mixed from spilling out.

(Function) Since the circumferential speed of the surface of the rotary disk 1 gradually changes in the radial direction, the premixing device 5 premixes the surface of the rotary disk 1.
The raw materials to be mixed supplied between the rotating disk 1 and the pressing rollers 3 and 4 are subjected to strong pressure by the cooperation of the rotary disk 1 and the pressing rollers 3 and 4, and at the same time are subjected to a twisting action, resulting in extremely efficient mixing. action takes place.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

First, to explain the general structure of the device, as shown in FIG. 2 as a plan view, one set is sandwiched from both sides of the disk surface 3 of the rotary disk 1 which is pivotally supported on a horizontal rotating shaft 2. Pressing rollers 3 and 4 are installed with their axial directions oriented in the radial direction of the rotary disk 1.

As shown in FIG. 1.2, raw materials to be mixed are supplied from a premixing device 5 to a gap a between the rotary disk 1 and each of the pressing rollers 3 and 4.

Next, the detailed configuration will be explained.

The rotary disk 1 into which the rotating shaft 2 is inserted has both disk surfaces 6, 6.
A disk-shaped holding plate 1.7 with a shaft hole is placed along the plate, and holds the rotary disk 1 with a plurality of fastening bolts (not shown), and also prevents the rotary disk 1 from rotating with respect to the rotating shaft 2. There is.

Reference numeral 8.8 denotes a bearing for the rotating shaft 2, which is attached to the machine frame of the device (not shown).

The lengths of the pressure rollers 3 and 4 are set to be slightly shorter than the radius of the rotary disk 1, and the pressure rollers 3 and 4 are arranged with their axial directions along the radial direction of the rotary disk 1 as shown in FIG. 1.2. Minute gap a
It is placed opposite to the plate surface 8 of the rotary plate 1 with .

The bearings 11 that support both ends of the shafts 3 and 10 of the pressure rollers 3 and 4 each have a pair of pillars 12.1 arranged in a portal shape.
It is attached to 3. As shown in FIG. 3, the lower end of each support column 12, 13 is supported by the machine frame 14, and bolt holes are provided in opposing positions at the upper end of each column. Reference numeral 15 denotes a screw rod that passes through these bolt holes, and one end thereof has both supports 12.
A handle 16 is screwed onto the handle 16 for finely adjusting the distance between the upper ends of the gaps 13, thereby adjusting the distance between the pair of gaps a and a, respectively.

In Fig. 2, 17.11 is the axis of the pressure roller 3.4!
, 11, and are rotated in opposite directions by variable speed motors 19 and 211, respectively.

Next, the premixing device 5 is equipped with a stirring device 22 installed in the raw material hopper 21 as shown in FIG.
This stirrer 22 has a structure in which a plurality of stirring bars 24 are provided radially protruding in parallel to a rotating shaft 23. 25 is a variable speed motor for driving the stirrer.

The lower part of the raw material hopper 21 is divided into two parts, and the raw material outlets 21a and 21m at the lower ends thereof are located directly above the gaps a and a, respectively.

In FIG. 2, 26 and 27 are flanges attached to one end surface (the right end surface in the figure) of the pressure rollers 3 and 4, and each gap a,
This serves to prevent the raw materials to be mixed from spilling out from the right end of a.

28 is a conveyor provided below the pressing rollers 3 and 4 to transport the mixed raw material toward its storage area, and 29 is a guide plate for the mixed raw material.

Next, the operation of the above configuration will be explained.

First, in order to make the dark gap a between the rotary disk 1 and both pressure rollers 3.4 correspond to the desired particle size of the mixed raw materials, and to apply a pressing force to the raw materials to be mixed that is suitable for the material, the handle is adjusted. Adjust by rotating the IG appropriately.

Thereafter, the variable speed motors 19, 20.25 are driven to adjust the rotation speed of the press rollers 3, 4 to a speed suitable for the raw materials to be mixed, and the plurality of raw materials stored in respective raw material tanks (not shown) are The premixing device 5 mixes different types of raw materials in predetermined ratios.
Supply will begin.

The raw material to be mixed that has fallen into the raw material hopper 21 is transferred to the agitator 2.
Premixed by 2. The unpremixed raw r-+ is
Outlet 21 of raw material hopper 27. ．． It falls from 21B into the gaps a and a between the rotary disk 1 and the pressure roller 3 or 4, and is drawn into the gaps a and a as the pressure rollers 3 and 4 rotate, respectively. Along with this, the rotary disk 1 is also rotated accordingly.

In such a state, the circumferential velocity of the disk surface 6 of the rotary disk 1 is not uniform from the center of the disk surface toward the outer periphery, but increases as it approaches the outer periphery.

On the other hand, the peripheral speed of the outer peripheral surface of the pressure rollers 3 and 4 is in the axial direction,
Therefore, it is uniform over the entire length of the rotary disk 1 in the radial direction.

Therefore, the raw material to be mixed that falls into the gap a and is drawn into the gap a is not only pushed out while being subjected to strong pressure, but is also subjected to a so-called twisting action.
A plurality of types of raw materials to be mixed perform complex mutual movements with each other, resulting in an extremely efficient mixing action.

At the same time, if the raw material to be mixed is the above-mentioned porous granular ceramic raw material, its structure is significantly densified by being strongly pressed between the rotary disk 1 and the pressing roller 3.4.

At that time, one end side of the gap a (the right end side in the figure) is the flange 26.2.
1, and the other end is closed by the outer peripheral surface of the holding plate 7.7 of the rotary disk 1 as shown in FIG. There is no need to cause troubles such as spillage and reduction of the mixing force.

The mixed raw materials discharged below the gap a are guided by the guide plate 29, fall onto the conveyor 28 below, and are transported toward a storage location.

In this way, according to the above configuration, the raw material to be mixed is transferred to the rotary disk 1.
When passing through the gap a between the plate surface 6 and the pressure rollers 3 and 4, an extremely effective mixing action is achieved by receiving torsional force and strong pressure at the same time, so the mixing device can be made smaller. Even if it is made, a sufficiently high mixing ability can be obtained.

When the powder coloring material 2 is strongly pressurized within the gap a, it tries to escape to both ends of the gap a to which the strong pressure is not applied. Since it is stopped, there will be no problem of raw materials spilling out from this part.

Since the collar 24 is rotated together with one compression roller 6, the collar 24 is rotated against the end surface of the other compression roller 7.
Contact is not constant, but only intermittently. Therefore, compared to the conventional case where a pair of rollers is fixed with a weir plate in sliding contact between each end surface, the wear of the collar 24 is significantly delayed, and it is possible to save power. .

Furthermore, since the pair of pressing rollers 3 and 4 are arranged opposite to each other across the plate surface 6 of the rotary plate 1, the large pressing forces exerted by them have the effect of canceling each other out. It is also possible to simplify the machine frame structure.

In addition, in the above configuration, the rotary disk 1 and the pressing rollers 3, 4
The shape and dimensions of the mixer can be set appropriately depending on the material of the raw materials to be mixed and differences in particle size, etc., and the detailed structure can be changed as appropriate, such as the premixing device is not limited to the configuration shown in the figure. Even so, the object of the present invention can be achieved.

[Effects of the Invention] As is clear from the above explanation, according to the powder mixing device of the present invention, unlike the conventional roller type mixing device, the raw materials to be mixed are subjected to a mere pressing action between the rollers. Not only that, but a kind of twisting action is applied between the rotary disk and the pressure roller, resulting in extremely efficient mixing.

Therefore, when comparing a conventional roller-type mixing device of the same size and the mixing device of the present invention, the device of the present invention exhibits far superior mixing ability.

Therefore, the installation space for the mixing device can be reduced accordingly, and the operating costs thereof can be significantly reduced.

Further, for example, porous raw materials such as granular ceramic raw materials are sufficiently densified by being subjected to intense pressure.

As described above, the powder/granule mixing device according to the present invention greatly contributes to reducing equipment costs, improving product yield, improving product quality, etc. in ceramic factories and the like.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which 1st [21] is a front view, 2nd figure is a plan view, 312I is a partial side view showing the attached state of a pair of pressure rollers, and 4th figure is a FIG. 3 is an explanatory diagram of the operation of the mixing device. Code Table 2 Rotating shaft 5 Pre-mixing device 7 Holding plate bearing S, 10 Shaft support 14 Machine frame 16 Handle 1 Turning plate 3.4 Pressing roller 6 Plate surface 8.11 12.13 15 Screw rod 17.18 Pulley 19.211 Possible Variable speed motor 21 Hopper 23 Rotating shaft 25 Motor 2I Conveyor 22 Stirrer 24 Stirring bar 2G, 21 collar 2! Guidance board

Claims (3)

[Claims] (1) A rotary disk 1 having a predetermined diameter and arranged to be able to idle; and a rotary disk 1 disposed opposite to each other so as to be in contact with both surfaces 6, 6 of the rotary disk 1, respectively, and rotating in the axial direction thereof. A pair of pressure rollers 3 and 4 oriented in the radial direction of the disk 1, motors 19 and 20 that drive the pressure rollers 3 and 4, and a plurality of types of raw materials to be mixed are premixed, and then the rotary disk 1 and a premixing device 5 which is supplied between the pressing roller 3 or 4. (2) The powder/granule according to claim 1, characterized in that a gap a is provided between the rotary disk 1 and the pressure roller 3 or 4, and the gap a is adjustable. mixing device. (3) The powder/granule mixing device according to claim 1 or 2, characterized in that flanges (26, 27) are attached to the end surfaces of the pressing rollers (3, 4) to prevent the raw materials to be mixed from spilling out.