JPH02258043A - Stirring heat treatment apparatus of indirect heating type - Google Patents

Abstract

PURPOSE:To provide self-cleaning ability by providing a plurality of stirring disks on each of a pair of parallel stirring shafts perpendicularly thereto and forming small spaces between the opposite sides of the stirring disks. CONSTITUTION:A pair of hollow stirring shaft 21 and 22 rotatable in a casing 1 in the opposite directions at the same speed in arranged in parallel and horizontal relation. A plurality of hollow fan-shaped stirring disks 23 and 24 are provided on the shaft 22 and 21, respectively, in such manner that they intersect the shafts perpendicularly and are displaced from each other at a predetermined angle in the rotating direction in communication with the hollow interior of the shaft and in equally spaced relation. Obliquely cut faces 25-27 are formed on the front and rear end faces of the disks 23 and 24 in the rotating direction. The disk 24 is fitted between the disks 23 and the disk 23 between the disks 24 in the axial direction between the two shafts will small spaces formed between the opposite sides of the disks 23 and 24 and between the outer peripheral surfaces of these disks 23 and 24 and the surfaces of the shafts. This provides self-cleaning ability even at the time of treating viscous materials.

Description

DETAILED DESCRIPTION OF THE INVENTION In the present invention, a granular material containing water and volatile matter as a sticky raw material is heat-treated by conduction heating. In particular, the present invention relates to an indirect heating stirring heat treatment machine having self-cleaning properties (self-scraping properties) for the purpose of drying.

Previous Examples This applicant had previously proposed an indirect heating type stirring dryer as an example of this type of heat treatment machine (Japanese Patent Application Laid-Open No. 63-279086).
No.), this dryer removes raw materials that accumulate in the dead space,
This was done to prevent uneven drying of raw materials that are transferred without stagnation, resulting in a decline in product quality.

By the way, in the conventional indirect heating type stirring heat treatment machine as mentioned above, stirring blades having a width larger than the thickness of the disk are provided at the rear end of each hollow fan-shaped stirring disk. However, there was a problem in that the gap between the opposing side surfaces of the disk became large, making it impossible to scrape off the material adhering to the side surface of the disk when processing sticky raw materials.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to eliminate the above-mentioned conventional problems and to provide an indirect heating type stirring heat treatment machine that reduces adhesion to the side surfaces of the disk even when processing sticky raw materials, and has self-cleaning properties. shall be.

In order to achieve the above-mentioned object, the present invention provides an indirect heating type stirring heat treatment machine as described above, as shown in the drawings.
The front and rear end surfaces of the second stirring disks 23 and 24 in the rotational direction are respectively cut surfaces 25 that are inclined with respect to the feeding direction.
．． 26 and 27.28, and the first,
In the axial direction between both stirring shafts, the second stirring disk 24 on the other stirring shaft 21 is arranged between the first stirring disk 23 on one stirring shaft 22, and the second stirring disk 24 on the other stirring shaft 21 The first stirring disk 23 of one stirring shaft 22 is placed between the stirring disks 24, between the opposing sides of the first stirring disk and the second stirring disk, and between the outer peripheral surfaces of the first and second stirring disks and the surface of the stirring shaft. There is a slight gap δ0. and δ2 are formed and arranged in a fitted manner.

Moreover, in this case, the inner surface of the casing 1 below the axis of the stirring shaft and the first. Second stirring disks 23, 24
It is preferable that a slight gap δ is formed between the outer circumferential surface and the outer circumferential surface.

When the stirring shafts 21 and 22 rotate in opposite directions,
The raw material to be supplied is conveyed by cut surfaces 25.27 formed on the front end surfaces of stirring disks 23.24 attached to each stirring shaft.

At this time, even if the raw material adheres to the side surface of the disk, since a slight gap δ□ is formed between the opposing side surfaces of the first and second stirring disks 23 and 24, the adhered raw material will be scraped by the disk. taken. That is, disk 23.
24 has a self-cleaning effect.

In addition, the outer peripheral surface of the disk 23, 24 and the stirring shaft 21° 22
Since the surfaces of the disks 23 and 24, the outer circumferential surfaces of the disks 23 and 24, and the inner surface of the casing 1 face each other with slight gaps δ2 and δ3, there is no possibility that the raw material will adhere to them.

Next JLJL In Figures 1 to 3, 1 is a double U-shaped casing, which has a lower casing 3 with a jacket 2 attached to its outer surface and an opening 5 at the upper part.

It consists of an upper casing 7 with a jacket 6 attached to its outer surface, and a lid 8 is attached to the opening 5 of the upper casing 7.

Reference numerals 10 and 11 are supply ports for heat medium (steam, hot water, heat transfer oil, etc.) to the jackets 2 and 6, 12 and 13 are discharge ports for the same, and 15 is a supply port for raw materials (powder and granular material). 16 is the same discharge port, 17 is a supply port for supplying carrier gas into the casing 1, and 18 is the same discharge port.

Inside the casing 1, hollow stirring shafts 21 and 22, which rotate in opposite directions at the same speed, are horizontally arranged in parallel, as shown by arrows.

On the stirring shaft 22 is a hollow fan-shaped first stirring disk 23.
A similar hollow fan-shaped second stirring disk 24 is attached to the stirring shaft 21.
are arranged at equal intervals in a direction perpendicular to the axis of the stirring shaft.

That is, the disks 23, 24 are each connected to the stirring shaft 22.
．． 21, adjacent ones in the axial direction do not overlap in the circumferential direction, and are arranged so that every other one is shifted by a certain angle in the rotational direction, so that they are parallel in each row. The front end face and the rear end face in the direction are formed into cut surfaces 25 and 26 inclined with respect to the feeding direction,
The front and rear end surfaces of the disk 24 in the rotational direction are also formed into cut surfaces 27 and 28 that are inclined with respect to the feeding direction.

The relationship between the mounting arrangement of the disks 23 and 24 will be further explained in detail based on FIGS. 4 to 6.

The disks 23 and 24 have a thickness T in the axial direction, a fan-shaped angle α in the plane orthogonal to the axis, an angle γ of the cut surfaces 25, 26, 27, and 28, an outer radius, and a uniform pitch P. ing.

δ is a slight gap between the opposing sides of the disks 23 and 24 that do not touch each other, and has the relationship P=T+61.

β' and β are the cut surface 25°2 of the disc 23.24
At the angle on the disk circumference expansion calculated by the angle γ of 7.

The relationship is , and β is There is a relationship between

In FIG. 4, which shows a developed view of the outer periphery of the disks 23 and 24, the disks 23 on the stirring shaft 22 are arranged such that the disk at the first pitch position (right 1) is the reference point 00, and the disk at the odd pitch position (1) is the reference point. right 3.5...) are shifted by an angle (β10〇), and the disc at the second pitch position (right 2) uses 180''10 as the reference point, and the disc at the even pitch position (right 4, 6...) are shifted by an angle (β10).

Similarly, for the stirring shaft 21, the disc at the first pitch position (left 1) is set at 180°, and the disc at the odd pitch position (left 3.5...) is set at an angle (β10). The disc at the second pitch position (left 2) uses the angle θ as the reference point, and the disc at the even pitch position (left 4, 6)
) is shifted by an angle (β10).

When the stirring shaft 22.21 on which the disks 23.24 are arranged so that θ:β is rotated at a constant speed in the direction shown by the arrow in FIG. 4, points D and E and points D' and E' are obtained. are overlapped, that is, the side surface of the left disk 2 represented by E-E' and the side surface of the disk (right 1) that faces each other with a slight gap δ□ at D-D' scrape each other once per rotation. Fits (self-cleaning).

The condition for self-cleaning as described above is that θ is equal to β or β', but since the cut surfaces 25, 26 and 27, 28 of the disks 23, 24 are planes formed at an angle γ, the root of the disk It is also necessary to consider self-cleaning at the shaft surface (portion close to the shaft surface). To do this, select an appropriate shift angle θ for β determined by γ, D, and P.

It becomes possible to scrape all sides.

For example, if the angle γ is 45° and the thickness of the disk 23.24 is 19% of the outer diameter of the disk 23.24, then β'=22.31 from equation (1).

In addition, the stirring shaft 2
If the outer diameter d of the disks 2 and 21 is 53.3%, and the gap δ2 between the outer peripheral surface of the disk 23.24 and the surface of the stirring shaft 22.21 is 1%, the distance between the shafts of both shafts is 0. It becomes 7765D.

Now, select the fan angle α = 130° and the shift angle θ = 30° for the disks 23 and 24, and align the disk (right 1) and disk (left 2) with each other as shown by the line C-C in Fig. 4. When the side meshing locus is visualized using a computer, it becomes as shown in Figure 7.

It can be seen that almost the entire surfaces of the two opposing surfaces are scraped together.

Typically, the sector angle α of the disks 23,24 is 120-150
°, the angle γ of cut surfaces 25, 26 and 27, 28 is 1
5~45@, the thickness T of the disk 23.24 is 15~25% of the outer diameter of the disk, and the slight gaps δ1, δ2, δ3 are 0.
5 to 3%, preferably 1% from the viewpoint of scraping effect.

Note that the angle γ of the cut surface 26.28 of the rear end surface is preferably the same as the angle γ of the cut surface 25.27 of the front end surface in order to maximize self-cleaning efficiency, but the efficiency may be slightly reduced. If sacrifice is acceptable, they do not need to match or may exceed the angular range (15' to 45°).

In this way, the side surfaces of the disks 23 and 24 face each other once per rotation with a small gap δ1, which increases the effect of scraping (dropping) the raw materials adhering to the disk sides, and also increases the effect of scraping (dropping) the raw material adhering to the disk sides. Since stirring is performed, the heat transfer coefficient from the side surface of the disk to the raw material becomes extremely large.

Next, since all the disks 23 and 24 are attached so that the angle γ of the cut surface is in the feeding direction of the raw material, other means such as attaching feeding blades or tilting the casing 1 toward the discharge side are used. In addition to being able to transport raw materials without any friction, the circumferential speed of the outer circumference of the disk can be reduced to 3 to 30 m/wi.
Since it can be operated at a low speed of n, there is less wear on the raw material on the disk surface compared to conventional high-speed stirring dryers.

In FIGS. 1 and 2, 31 and 32 are gears attached to one end of the stirring shafts 21 and 22 that protrude outside the casing 1, and 33 is a gear attached to the shaft of the variable speed electric motor 35.
The stirring shafts 21 and 22 are rotated at a constant speed in opposite directions through the gears 31 and 33, and the gears 31 and 32, which are in mesh with each other. In addition,
The feed amount of the raw material is adjusted by the stirring shaft 21.2 by the electric motor 35.
This is done by varying the rotational speed of the second rotation speed.

37.38 is the stirring shaft 2 further outward from the gears 31.32.
1.22, the heat medium is supplied from the rotary joint 37 into the stirring shaft 21.22, and is passed through a communication hole (not shown) to the disk 23.24.
the stirring shaft 21.2 through the communication hole (not shown).
2 and is discharged from the rotary joint 38. Note that a rotary joint having an entrance/exit only at one shaft end may be installed.

As shown in FIG. 3, the upper casing 7 has a stirring disk 23.
24 to prevent the material from adhering to or staying on the inner surface of the rising portion due to swelling of the material due to the scraping action of the disk. The covering angle from the horizontal plane of the axis is determined by the properties of the raw material, particularly the adhesiveness, but is generally 30 to 900 degrees, and usually preferably 60 degrees.

Further, the gap between the outer circumferential surfaces of the stirring disks 23 and 24 and the inner surface of the upper casing 7 is equal to the gap δ between the inner surface of the lower casing 3 and the outer circumferential surface of the stirring disk near the axial center horizontal plane, but as it goes toward the top, The contact resistance between the outer periphery of the disk and the inner surface of the casing is reduced by increasing the gap δ4 at the opening rising portion 7a to 3 to 5% of the outer diameter of the disk.

Since this invention has the above-mentioned structure, raw materials such as powder and granules that are slurry-like and become sticky during heat treatment,
When heat treating raw materials such as sticky powder containing high moisture or volatile substances, it is of course possible to reduce the adhesion of raw materials to the sides of the disk, and also to reduce the adhesion of powder to the outer circumferential surface of the disk and the surface of the stirring shaft. It is also possible to reduce the adhesion of particles, and it is possible to achieve a self-cleaning effect on the disk. Moreover, as a result of the above, it is possible to eliminate the put space in the casing and prevent the raw material from stagnation, so that the raw material can be completely discharged, and it becomes easy to change the brand of raw material and clean the inside of the casing. Therefore, a uniform product can be obtained and continuous operation can be ensured stably.

In the case of claim 2, it is possible to further reduce adhesion of raw materials to the inner surface of the casing.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention;
FIG. 2 is a partially cutaway plan view of the same as above, FIG. 3 is an enlarged side sectional view of the same as above, FIG. A vertical cross-sectional view along the line ■-■ in Figure 4, and Figure 6 is a longitudinal cross-sectional view taken along the line ■ in Figure 5.
FIG. 7, which is a cross-sectional view taken along the line (-), is a computer-generated diagram of the meshing locus of opposing side surfaces of the disks. 1...Casing 2, 6...Jacket 3...
・Lower casing 5...Opening 7...Upper casing 8...Lid 21, 22...Stirring shaft z3・
...First stirring disk 24...Second stirring disk Patent applicant Kurimoto Iron Works Co., Ltd. Agent Patent attorney Sa 1) Mamoru Yugai 1 person ￥3 inshitomi, S: no, 9-ek' , ) to −1−meΣ%s L
Figure 5 Figure 6 Procedural Amendment 6, 5E, July 7, 1999

Claims (1)

[Claims] 1. Inside the casing, a pair of hollow stirring shafts that rotate at the same speed in opposite directions are arranged horizontally in parallel, and on one of the stirring shafts is a hollow fan-shaped first stirring disk, On the other stirring shaft, a plurality of hollow sector-shaped second stirring disks are arranged at equal intervals, each perpendicular to the axis of the stirring shaft, shifted by a certain angle in the rotation direction, and communicating with the hollow interior of the stirring shaft. In the indirect heating type stirring heat treatment machine, the front and rear end surfaces of the first and second stirring disks in the rotational direction are each formed into a cut surface inclined with respect to the feeding direction, and The second stirring disk is the first stirring disk on one stirring shaft in the axial direction between both stirring shafts.
The second stirring disk on the other stirring shaft is between the stirring disks, the first stirring disk on one stirring shaft is between the second stirring disk on the other stirring shaft, and the first stirring disk and the second stirring disk are opposite to each other. 1. An indirect heating type stirring heat treatment machine, characterized in that the first and second stirring disks are fitted into each other with a slight gap formed between their side surfaces and between the outer peripheral surfaces of the first and second stirring disks and the surface of the stirring shaft. 2. In the indirect heating type stirring heat treatment machine according to claim 1,
The inner surface of the casing below the axis of the stirring shaft and the first and second
An indirect heating type stirring heat treatment machine, characterized in that a slight gap is formed between the stirring disk and the outer peripheral surface thereof.