JPH0624615B2 - Mixing device for powder and granules - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a set of one set suitable for use for the purpose of, for example, applying a powdery coloring material to a granular ceramic material. The present invention relates to a powder / granular mixing device for mixing raw materials supplied between rollers.

(Prior Art) Conventionally, for example, in order to manufacture a tile with a speckled pattern, first, a granular ceramic raw material with a powder coloring material applied to the surface is made, and a plurality of different types of granular ceramic raw materials are used. Was mixed and press-formed into a tile shape, and then fired.

Then, in order to apply the coloring material to the granular ceramic raw material, conventionally, the granular ceramic raw material is mixed with the coloring material made into a mud shape by adding water in a drum equipped with a stirring blade such as a concrete mixer. It depended on the method of making.

(Problems to be solved by the invention) However, according to the above-mentioned conventional method, the mud-scented coloring material penetrates deeper than necessary into the inner part of the granular ceramic raw material, and the expensive coloring material is wasted accordingly. Was causing a problem that was consumed by.

Further, when the granular ceramic raw material is press-formed into the shape of a tile, excess water is squeezed out into the forming die, resulting in a defective product.

Therefore, it is conceivable to mix the colorant with powder powder or granular ceramic raw material and apply it, but with this method, the colorant is merely sprinkled on the surface of each particle, and the required amount of colorant is ensured. Could not be applied to.

Further, since the granular ceramic raw material has a porous structure when viewed microscopically, the degree of shrinkage during firing varies, and defective products are likely to occur.

Alternatively, in the conventional roller type mixing device, the pair of cylindrical mixing rollers have different peripheral velocities, so that the material to be mixed easily adheres to the roller surface. , Excellent mixing performance, in particular, when mixing a powdery coloring material to the granular ceramic raw material, it is possible to surely adhere an appropriate amount of the coloring material to the surface of each particle without excess or deficiency, and to make it porous. It is an object of the present invention to provide a powder / granular mixing device having a performance capable of substantially eliminating the drawbacks of the above-mentioned conventional ones, such as the structure of a granular ceramic raw material being densified.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, a powder / granule mixing device according to the present invention comprises a conical roller 1 having a conical outer peripheral surface 1a, and a conical roller 1 A pressing roller 9 installed so that its axial direction is oriented in the radial direction of the roller 1 and its outer peripheral surface faces the conical outer peripheral surface 1a, and the conical roller 1 and the pressing roller 9 are opposed to each other. The rotating means 6 and 14 for rotating and the raw material supply unit 20 for supplying the raw material to be mixed are provided between the conical roller 1 and the pressing roller 9.

The balancing roller 16 may be brought into contact with the conical outer peripheral surface 1a of the conical roller 1 at a position symmetrical with the pressing roller 9 on the diameter line.

The length of the pressing roller 9 is made equal to the slope length of the conical outer peripheral surface 1a of the conical roller 1, and the collar 1 for preventing the material to be mixed from leaking is provided on both end surfaces of the pressing roller 9.
1 and 11 should be provided.

A gap a is preferably provided between the conical roller 1 and the pressing roller 9 and the gap a can be adjusted.

(Operation) Of the conical roller 1 and the pressing roller 9 which are rotated in opposite directions, the pressing roller 9 has a uniform outer peripheral speed over the entire length in the roller axial direction, whereas the conical roller 1 Since the peripheral speed of the conical outer circle 1a of the tape gradually changes from one end to the other end in the axial direction, the pressing roller 9 exerts influence on the material to be mixed supplied between the rollers 1 and 9. In addition to the mixing action due to the strong pressure, the torsional force acts.

Therefore, the raw materials to be mixed are subjected to a complicated mixing action and are mixed extremely efficiently.

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

1 is a conical roller, the rotation axis 2 of which is oriented horizontally,
It is supported by bearings 3, 4, 5. The bearing 3 is a thrust bearing.

The outer peripheral surface of the conical roller 1 is formed into a truncated conical surface, and the peripheral edge portion on the bottom surface side of the conical outer periphery 1a is chamfered.

A motor 6 drives the conical roller 1, and transmits a rotational force to a large gear 7 fitted to the rotating shaft 2 of the conical roller 1 via a small gear 8.

Reference numeral 9 denotes a pressing roller, the outer peripheral surface of which is opposed to the conical outer peripheral surface 1a of the conical roller 1 with a narrow gap a in a state in which the rotary shaft 10 is oriented in the radial direction of the conical roller 1.
The length of the pressing roller 9 is made substantially equal to the slope length of the conical outer peripheral surface 1a, and the flanges 11 and 11 are replaceably attached to both end surfaces of the conical outer peripheral surface 1a so as to close both ends of the gap a. ing.

In order to adjust the width of the gap a, the bearings 12 and 13 that support the rotating shaft 10 of the pressing roller 9 are attached to a machine frame (not shown) of the kneading device via a slide mechanism (not shown). Has been done. The rotational force of the variable speed motor 14 is transmitted to the rotating shaft 10 via the transmission mechanism 15.

Reference numeral 16 denotes a balancing roller, which is in contact with the conical outer peripheral surface 1a at a position symmetrical with the pressing roller 9 on the diameter line of the conical roller 1. The rotating shaft 17 of the balancing roller 16 is supported by bearings 18 and 19.

Reference numeral 20 denotes a raw material supply unit that supplies the raw material to be mixed into the gap a between the conical roller 1 and the pressing roller 9. This raw material supply unit 2
0 has a hopper 22 incorporating a mixer 21 for premixing the raw materials, and a drive motor 23 for the mixer 21. The raw material outlet 22a of the hopper 22 has a gap a
It is located directly above.

Next, the operation of the above configuration will be described by taking an example when a powdery coloring material is applied to a granular ceramic material.

When the gaps a between the conical roller 1 and the pressing roller 9 are adjusted to a desired preset distance and the motors 6, 14, and 23 are driven respectively, the conical roller 1 does not mix.
The pressing roller 9 and the pressing roller 9 are rotated in the directions opposite to each other as shown by the arrow in FIG.

In this case, the peripheral speed at the intermediate portion in the axial direction of the conical outer peripheral surface 1a of the conical roller 1 and the peripheral speed of the outer peripheral surface of the pressing roller 9 are made to substantially match, but depending on the kind of the material to be mixed, Alternatively, they may be appropriately different so that the best mixing effect can be obtained.

After starting the apparatus, when the granular ceramic raw material and the powdery coloring material stored in each raw material tank (not shown) are continuously introduced into the hopper 22 at a predetermined supply rate, the falling raw material is mixed by the mixer 21. Premixed.

Then, this premixed raw material is the raw material outlet 2 of the hopper 22.
It drops from 2a toward a gap a between the conical roller 1 and the pressing roller 9 and is held in the gap a.

Here, the peripheral speed of the conical outer peripheral surface 1a of the conical roller 1 is fast on the bottom surface side of the cone and gradually decreases toward the top surface side, whereas the peripheral speed of the outer peripheral surface of the pressing roller 9 is its axis. It is uniform over the entire length of the direction.

Therefore, the raw material to be mixed supplied into the gap a is not only subjected to the mixing action by the pressing force as in the conventional roller type mixing device, but also twisted by the cooperation of the conical roller 1 and the pressing roller 9. Power is also applied at the same time, and an extremely effective mixing action is performed.

Since both ends of the gap a are closed by the collars 11 and 11 attached to both end surfaces of the pressing roller 9, respectively.
It is possible to prevent the material to be mixed that has been subjected to strong pressure from protruding from both ends of the gap a.

Therefore, it is possible to solve the serious problem that it is difficult to perform the mixing evenly, which has been found in the prior art lacking such a gap sealing means.

Further, even when a strong pressing force by the pressing roller 9 is exerted on the conical outer peripheral surface 1a from the side thereof during the operation of the mixing device, this pressing force is provided to the balancing roller 16 facing the pressing roller 9. The rotation shaft 2 of the conical roller 1 does not have a risk of being eccentric.

The object of the present invention can be achieved even if the detailed structure of the embodiment, for example, the shapes and dimensions of the conical roller 1, the pressing roller 9, the balancing roller 16 and the like, the rotation mechanism thereof, and the like are appropriately changed.

And, of course, the mixing device according to the present invention, in addition to mixing the granular ceramic raw material and the powdery coloring material, when used to mix various other raw materials, sufficiently exhibits the excellent mixing performance as described above. To do.

[Effects of the Invention] As is clear from the above description, according to the powder / granule mixing apparatus of the present invention, the material to be mixed supplied between the conical outer peripheral surface of the conical roller and the pressing roller is Similar to the conventional roller type mixing device, it receives a mixing action due to the pressing force, and because the peripheral speed of the conical outer peripheral surface gradually changes in its axial direction, it also receives a kind of twisting action and is complicated. A high mixing efficiency is obtained, and extremely high mixing efficiency is obtained.

Therefore, it is possible to make a smaller and higher-performance mixing device, save the installation space of the mixing device, reduce the operating cost, etc., and it will greatly benefit the related industry.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a plan view and FIG. 2 is a partially cutaway front view. Code table 1 ... Conical roller, 2 ... Rotating shaft 3,4,5, ... Bearing 6,14,23 ... Motor (rotating means) 7 ... Large gear, 8 ... Smear gear 9 ... Pressing roller, 10,17 ...... Rotary shaft 11 …… Temperature 12,13,18,19 …… Bearing 15 …… Transmission mechanism, 20 …… Raw material supply section 21 …… Mixer, 22 …… Hopper

Claims (4)

[Claims] 1. A conical roller 1 having a conical outer peripheral surface 1a.
And a pressing roller 9 installed so that its axial direction is oriented in the radial direction of the conical roller 1 and its outer peripheral surface faces the conical outer peripheral surface 1a, and the conical roller 1 and the pressing roller 9 are An apparatus for mixing powder and granules, comprising: rotating means 6, 14 for rotating in mutually opposite directions; and a raw material supply unit 20 for supplying a raw material to be mixed between the conical roller 1 and the pressing roller 9. 2. A balancing roller 16 is brought into contact with the conical outer peripheral surface 1a of the conical roller 1 at a position symmetrical with respect to the pressing roller 9 on the diameter line thereof. Item 1. A device for mixing powder and granules according to item 1. 3. The pressing roller 9 has a length equal to the slope length of the conical outer peripheral surface 1a, and the pressing roller 9 has the same length.
3. The powder according to claim 1 or 2, characterized in that collars (11, 11) for preventing leakage of the raw materials to be mixed are provided on both end faces of the powder.
Granular mixing device. 4. A gap a is provided between the conical roller 1 and the pressing roller 9 and the gap a is adjustable. The powder / granular mixing device described in.