JP2580647Y2 - Scraper for dish granulator - Google Patents

Description

[Detailed description of the invention]

[0001]

This invention is intended to increase product yield when spheroidizing small specific gravity raw materials using a dish-type tumbling granulator.
The present invention relates to a scraper for a dish-type granulator, which is useful for obtaining granules having stable quality (grain size), and for example, from pitch fibers to spherical fibers as disclosed in JP-A-3-275139. It is suitable for use in a dish-type tumbling granulator used for spheroidization when producing a lump of activated carbon.

[0002]

2. Description of the Related Art There are many processes for granulating powdery raw materials to produce intermediate products such as chemical fertilizers, cement, and metals. For example, a process of granulating a raw material obtained by mixing lime superphosphate and ammonium sulfate to produce a fertilizer, a process of granulating a mixed powder of zinc concentrate and fume to produce a sintering raw material, and a process of producing various cement raw materials. Processes such as granulation to make a cement clinker.

[0003] In such a granulation operation, a method of rolling granulation by a dish-type granulator is often used. The dish-type granulator generally includes a rotatable dish (referred to as a pan) arranged at an angle, as shown in FIG. 2, in which the powdery raw materials to be granulated and a binder (usually a pan) are placed. This is a device that charges water and spheroidizes the raw material. In this dish type granulator,
The powdery raw material charged in the dish is agglomerated into small particles due to the surface tension of the binder, and is moved upward by the rotation of the dish to start rolling by the weight of the particles themselves. In the course of this rolling, the powdery raw material continuously charged is gradually adhered to the surface thereof to gradually increase the diameter, and when it reaches a predetermined particle size, it is discharged from the dish. The rolling state of the particles as described above is schematically shown in FIGS. That is, the powdery raw material gradually transitions from the bottom portion of the dish to the surface layer as it becomes particulate and increases in diameter, and finally jumps out of the dish.

In such a dish-type granulation method, stabilizing the rolling trajectory of the granulated material in the dish is an essential condition for stabilizing the quality, particularly the grain size. For that purpose, it is necessary to keep the friction between the granules in the dish and the bottom of the dish constant. Therefore, a rake as shown in FIG. 2 is always installed in the dish-type granulator, and care is taken to always clean the bread bottom.

[0005] Usually, this rake is provided with a plurality of hard metal rods or pipes such as steel, and forcibly reciprocated with its tip in contact with the bread bottom (Japanese Patent Publication No. 31-6 / 1971).
No. 942) or by rotating to scrape off the wet ingredients adhering to the bread bottom. There is also a method of rotating a bowl-shaped container (see Japanese Utility Model Publication No. 41-5237).

[0006]

As described above, when a rake is used as a means for scraping wet ingredients adhering to the bread bottom, the reciprocating movement and the rotational movement of the rake are considered in consideration of wear of the dish bottom and the like. Cannot be done at high speed. That is, the reciprocating motion and the rotating motion are usually performed at a relatively slow speed.

[0007] Therefore, in such a process, the dish bottom cannot always be kept clean. However,
The powdered raw material using the above-mentioned dish-type rolling granulator generally has a relatively large specific gravity of 2 to 7, so that even if there are some irregularities on the dish bottom, the granulated material itself is rolled. There is no significant effect on the condition, and it is easy to peel off even when attached to the dish bottom,
Furthermore, since there is almost no adhesion to the rake itself,
Even with a rake having the above-mentioned functions, its purpose has been sufficiently achieved.

However, the fiber raw material disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 3-275139 proposed by the present inventors has a small specific gravity of 1 to 1.6, so that some irregularities are formed on the dish bottom. Even if it is present, the rolling state of the granules themselves changes, and the rolling locus of the granules changes, making it difficult to maintain a constant particle size. In addition, since a raw material having a small specific gravity, such as a fiber raw material, has a high adhesion to the dish bottom, keeping the bread bottom clean during operation is an even more important requirement. From such a point, when the rake having the above-described function is used, it has been extremely difficult to stably granulate the small specific gravity raw material with the dish-type granulator.

The present invention advantageously solves the above-mentioned problems, and proposes a scraper for a dish-type granulator capable of stably granulating a raw material having a low specific gravity such as a fiber raw material. With the goal.

[0010]

Means for Solving the Problems The inventors of the present invention have conducted various studies to solve the above-mentioned problems, and as a result, a plurality of cylindrical or prismatic synthetic resins are arranged in a comb at an interval of 2 mm or less. By installing a scraper with a distorted structure in a dish-type granulator, the cleanliness of the dish bottom can be maintained at all times, and the rolling trajectory of the granulated material is stable, and even if the raw material has a small specific gravity It has been found that a product having a particle size can be obtained stably. This invention is based on the above findings.

That is, this invention granulates a low specific gravity raw material,
A scraper to be installed in contact with the bottom of the dish of a dish-type tumbling granulator that is spheroidized, wherein the portion in contact with the bottom of the dish is formed by arranging a columnar flexible synthetic resin material at a distance of 2 mm or less with a reduced interval. The present invention provides a scraper for a dish-type granulator, comprising a comb-shaped body.

[0012]

In the scraper according to the present invention, the portion in contact with the bottom surface of the dish is formed of a comb-shaped body in which columnar flexible synthetic resin materials are arranged at a distance of 2 mm or less with a reduced interval. It can be pressed against the bottom and placed in close contact with it, so that the wet raw material adhering to the dish bottom can be effectively removed. Further, since the interval is 2 mm or less, no deposits remain. Further, the wear of the dish bottom by the scraper is sufficiently small.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 shows a main part of a dish granulator in which the scraper of the present invention is arranged, and FIG. 4 shows an example of the scraper. In the drawing, reference numeral 1 denotes a scraper according to the present invention, which is disposed in close contact with the bottom of a granulating dish 2 of a dish-type granulator rotating clockwise. 3 is a granulated material, 4 is a raw material supply port, and 5 is a water supply port.

This scraper 1 is, as shown in FIG.
A cylindrical or prismatic flexible synthetic resin material 8 arranged in a comb shape is fixed by a support plate 9. A plurality of such synthetic resin materials 8 are closely attached to the bottom surface of the dish 2 so as to be slightly bent. Thus, the unevenness of the bottom surface due to the adhesion of the wet raw material to the bottom surface of the dish 2 is blocked by the synthetic resin material 8 or blown off by the elasticity of the synthetic resin material 8 to clean the dish bottom. The numbers in the figure
Reference numeral 10 denotes a holder for the scraper 1, and t denotes a rolling locus of the granulated material 3.

As the synthetic resin material 8, hard vinyl chloride or acrylic resin is preferable from the viewpoint of balance between strength and elasticity and good workability.

For each size of the synthetic resin material 8, the diameter is preferably about 3 to 10 mm from the viewpoint of flexibility, and the length is preferably about 3 to 10 mm from the viewpoint of flexibility. From the balance between adhesion and flexibility, about 100 to 150 mm is desirable. With a scraper of such a size, the wet raw material does not adhere to the scraper 1 itself, and even if it adheres, it is immediately wiped off by its elastic vibration.
Since the wet raw material mass thus removed does not become larger than the diameter or width of the synthetic resin material, the wet raw material mass is rolled as it is as a granulated product inside the dish and becomes a product.

The interval of the synthetic resin material 8 as a comb-like arrangement is
It is preferably 2 mm or less. If it exceeds 2 mm, the cleaning effect is reduced by the gap. The interval is 2mm
In the following case, the gap can be sufficiently covered by the vibration due to the flexibility of the synthetic resin material 8.

The overall length of the scraper 1 depends on the diameter of the granulation dish 2, and an appropriate range is 20 to 20 mm of the diameter of the dish 2.
It is about 50%.

The scraper according to the present invention has been described above with reference to the drawings. However, the scraper according to the present invention is not limited to the illustrated example, but can be variously modified. For example, if the comb-shaped rows of the synthetic resin material 8 are at least one row, the effect aimed at by the present invention can be sufficiently achieved, but two or more rows may be used.

[0020]

[Effect of the Invention] The dish bottom scraper for the dish type rolling machine of the present invention can always keep the dish bottom clean even when granulating small specific gravity raw materials that easily adhere to the dish bottom with the dish type rolling machine. become. For this reason, the rolling locus of the granulated material inside the dish becomes constant, and a product having a stable particle size can be manufactured continuously for a long time. In addition, since the material of the portion in contact with the dish bottom is a synthetic resin material, it has good adhesion to the dish bottom and hardly wears the dish bottom. Further, since it is only necessary to install the device in one place in the dish, it is easy to mount and remove the device, and the occupied area is small, so that there is an effect that the degree of freedom in installing the material supply port and the water supply port is increased.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a main part of a dish granulator in which a scraper of the present invention is arranged.

FIG. 2 is an explanatory diagram of a conventional dish-type granulator provided with a rake.

FIG. 3 is an explanatory diagram schematically showing a rolling locus of a granulated material in a dish-type granulator.

FIG. 4 is an explanatory view showing an example of the scraper of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Scraper 2 Granulating dish 3 Granulated material 4 Raw material supply port 5 Water supply port 6 Dish-type granulator 7 Rake 8 Synthetic resin material 9 Support plate 10 Holder t Rolling locus of granulated material

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor: Masayuki Kado 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Engineering Co., Ltd. (56) References: Real public 3-68,834 (JP, Y2) Real public 51-25549 (JP, Y1) Jikken 41-5237 (JP, Y1) (58) Fields investigated (Int. Cl. ⁶ , DB name) B01J 2/14 D01F 9/12

Claims (1)

(57) [Scope of request for utility model registration] 1. A scraper installed in contact with the bottom of a dish of a dish-type tumbling granulator for granulating and spheroidizing a small specific gravity raw material,
A scraper for a dish-type granulator, wherein the portion in contact with the dish bottom is made of a comb-like body in which columnar flexible synthetic resin materials are arranged at a distance of 2 mm or less with a reduced interval.