JPH0346834Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) This invention relates to a scraping device that smoothly scrapes off raw materials adhering to the inner surface of a rotating plate in a rotating plate type granulator.

(Conventional technology) The procedure for forming lightweight aggregate using flyash generated from a coal-fired boiler as raw material is as follows.
For example, appropriate amounts of combustible carbon material and a binder are added to the fly ash, and green pellets are formed using a rotating plate granulator. The green pellets are continuously sintered on a moving grate, thereby forming a lightweight aggregate.

As a first conventional example of the above-mentioned granulator, there is one shown in FIGS. 7 and 8.

In the figure, numeral 1 denotes a granulator, and this granulator 1 has a rotary plate 3 that tilts and rotates on a stand 2 that is a stationary member. This rotary plate 3 is rotationally driven in the direction of arrow R in the figure by a deceleration motor (not shown). Further, a product discharge chute 4 is provided on the lower left side of the rotary plate 3.

When performing granulation using the granulator 1, raw materials are put into the rotary plate 3, and at the same time, an appropriate amount of moisture is applied from the upper surface of the rotary plate 3 by a spray means (not shown). Then, as the rotating plate 3 rotates in an inclined position, the raw material in the rotating plate 3 is lifted upward by friction and centrifugal force as shown by the spiral line A in the figure, and then lifted downward by the action of gravity. It rolls down and grows into grains while being subjected to rolling action. and,
As shown by arrow B in the figure, particles that have reached a required size are discharged through the product discharge chute 4 over the upper edge of the opening of the rotary plate 3.

Furthermore, in the above configuration, since a binder and water are added to the raw material fed into the rotary plate 3, the raw material adheres to the bottom surface 3a, which is the inner surface of the rotary plate 3, during the granulation. When this amount of adhesion increases, the volume within the rotary plate 3 decreases, resulting in the inconvenience that desired granulation cannot be achieved. Therefore, a scraping device 5 is provided to scrape off the excess deposits M so that the deposits M on the bottom surface 3a of the rotary plate 3 do not increase beyond the point where it functions as a coating on the bottom surface 3a.

The scraping device 5 has a beam 7 whose axis is horizontal and is provided so as to straddle above the rotary plate 3, and this beam 7 is supported by the pedestal 2. A support stand 8 is attached to the beam 7, and a movable frame 9, which is a circular pipe whose axis is horizontal and can reciprocate in the axial direction (arrow C in the figure), is supported on the support stand 8. This movable frame 9 is the bottom surface 3 of the rotating plate 3.
a is provided at a position where it rotates diagonally downward, is parallel to the bottom surface 3a, and extends substantially in the radial direction of the rotary plate 3. The movable frame 9 is provided with a plurality of scrapers 10 that protrude toward the bottom surface 3a of the rotary plate 3. Further, the movable frame 9 is reciprocated by a deceleration motor (not shown).

When the amount of matter M attached to the bottom surface 3a of the rotary plate 3 increases to a predetermined amount or more, the scraper 10 reciprocates along with the movable frame 9, and
As the rotary plate 3 rotates, this scraper 10 scrapes off the upper layer of the deposit M as shown in FIG.

Further, as a second conventional example, there is one shown in FIGS. 9 and 10. The basic configuration of this example is the same as above, but the scraper 10 has a hoof shape, and is supported by the support base 8 so as to be able to swing from side to side.

The operation in this example is also similar to that in the first conventional example.

(Problem to be solved by the invention) By the way, in the case of the above-mentioned conventional configuration, the scraper 10 is close to a point when viewed from the entire bottom surface 3a of the rotary plate 3. Afterwards, as particularly shown in FIG. 11, the scraping groove D remains in a spiral shape. Therefore, the shape of the bottom surface of the rotary plate 3 formed by the deposits M constantly changes and becomes extremely uneven. As a result, the rolling action of the raw material within the rotary plate 3 becomes uneven, resulting in the inconvenience that a desired granulation state cannot be obtained.

(Purpose of the invention) This invention was made with attention to the above-mentioned circumstances, and by keeping the inner surface of the rotating plate smooth, which is formed by deposits during granulation work, a constant rolling motion can be achieved. The purpose is to obtain the desired granulation state in a convenient manner.

(Structure of the invention) The features of this invention to achieve the above object are that the opposing ends of adjacent scrapers are brought closer to each other in the direction transverse to the rotational direction of the inner surface of the rotating plate, and It is located at a point with a predetermined interval in front and back.

(Example) Below, various examples of this invention are shown in Figures 1 to 6.
This will be explained using figures.

The basic configuration of these embodiments is almost the same as that of the conventional example. Therefore, the configurations that are different from the conventional example will be explained, and the common configurations will be simply designated by the reference numerals in the drawings and the explanation will be omitted.

1 to 3 show a first embodiment.

In the figure, 6 is an electric motor, and this electric motor 6 rotates the rotary plate 3 via a gear set 6a. Five plate-shaped scrapers 10 are provided protruding from the movable frame 9. Each scraper 10 has an arm 12 protruding from a movable frame 9 toward the bottom surface 3a of the rotary plate 3, and a steel plate 1 attached to the protruding end of the arm 12.
The liner 14 is attached via the liner 3. The material of this liner 14 is polymer resin,
It is made of wear-resistant material such as ceramics or stainless steel, and is removable from the arm 12.
It is now possible to exchange it for a new one.

Each of the scrapers 10 is provided to cross the rotational direction of the bottom surface 3a of the rotary plate 3, and to be gradually inclined downward as it goes from the inside to the outside in the radial direction of the rotary plate 3, and these scrapers 10 are parallel to each other. There is. Furthermore, the protruding ends of each scraper 10 are parallel to the bottom surface 3a of the rotary plate 3, and are located at equal distances from the bottom surface 3a.

Moreover, the opposing ends 10a of the adjacent scrapers 10
They are brought close to each other in a direction transverse to the direction of rotation of the bottom surface 3a of the rotary plate 3, that is, in the radial direction of the rotary plate 3, and are spaced apart from each other by a predetermined distance back and forth in the direction of rotation of the bottom surface 3a of the rotary plate 3. In the illustrated example, the opposing ends 10a of adjacent scrapers 10 are overlapped in the vertical direction, and the length l of the overlapped portion is approximately 1/10 of the width L of the scraper 10,
Further, the inclination α of the scraper 10 with respect to the horizontal plane is approximately 60°.

According to the above configuration, when scraping the bottom surface inside the rotary plate 3 formed by the deposits M of the raw material with the scraper 10, the opposing ends 10 of the adjacent scrapers 10
Since the pieces a are overlapped with each other, the bottom surface inside the rotary plate 3 is completely scraped off by the scraper 10. Therefore, the bottom surface inside the rotary plate 3 is constantly kept smooth as a whole. Further, in this case, the raw material scraped off by the scraper 10 passes between the two scrapers 10, 10 and falls downward along the angled scraper 10 (arrow E in FIG. 1).

In the above case, the number of scrapers 10 may be any number from several to more than ten. Further, the above length l is 1/10 to -1/ of the width L of the scraper 10.
5, the inclination α of the scraper 10 is preferably in the range of 45 to 70 degrees, and the width dimension is preferably in the range of 200 to 300 mm.

By the way, the ideal state of granulation is for the particle size of the raw pellets to increase from the center to the outside of the spiral line A, as shown in FIG. To do this, as shown by the arrow A' in Figure 1, the above-mentioned raw pellets are lifted as high as possible to the top of the rotary plate 3 and then dropped, and the raw material powder that has not grown into pellets is removed by the arrow A' in Figure 1. It is important to form raw pellet seeds by lifting them up to a certain height as shown by A'' and then dropping them downwards.
It is necessary to satisfy the conflicting demands of having an appropriate frictional force that can lift them up to the position indicated by A'' and that they begin to slide easily when they reach each of the above positions. 3
The rotation speed is adjusted by the rotation speed of the rotary plate 3 and the angle of the rotary plate 3 shown by the middle inclination angle α in FIG.

However, appropriate amounts of binder and water are added and humidified to the raw material powder, and in the case of special raw materials such as fly assemblies, the surface of the deposits M at the corners in the upper part of the rotary plate 3 is If this happens, a bridging phenomenon will occur at the corner, making adjustment impossible, making it impossible to obtain the appropriate frictional force and slippage as described above. For this reason,
There is a disadvantage that ideal continuous granulation cannot be achieved.

Furthermore, when the rotary plate 3 is rotated while the bridging phenomenon is still occurring, the raw material causing the bridging phenomenon hits the stationary scraper forming a predetermined formation on the surface of the deposit M at the corner portion. That will happen. In this case, a large force is applied to the stationary scraper, which causes vibration and damage to the granulator. Moreover, if an attempt is made to prevent these problems, large equipment is required, which is an inconvenience.

Therefore, in order to solve the above problems, the granulator 1 in this embodiment is configured as follows.

That is, the bottom surface 3a of the rotary plate 3 supported by the beam 7
A stationary scraper 11 facing the top is provided. The edge of the stationary scraper 11 facing the bottom surface 3a is formed into an arcuate edge 11a with a radius r.
When the rotary plate 3 rotates, the arcuate edge 11a of the fixed scraper 11 scrapes the surface of the deposit M at the upper corner of the rotary plate 3 to form an arcuate surface with a radius r. Note that, like the scraper 10, a liner 14 is attached to the arcuate edge 11a of the fixed scraper 11 via a steel plate 13.

In the above case, the radius r is 0.5 of the depth h of the rotating plate 3.
~1.5 times is preferred. When formed in this manner, the surface of the deposit M at the corner portion of the rotary plate 3 has a shape that changes gently without any angle, so that the bridging phenomenon is prevented from occurring. Therefore,
The raw material does not hit the fixed scraper 11, and the occurrence of problems such as vibration in the granulator 1 is prevented.

FIG. 4 shows a second embodiment. In the figure, the scraper 10 is composed of an arm 12 and a hardfacing 15 welded to the protruding end of the arm 12. Further, the arcuate edge 11a of the fixed scraper 11 is also similarly hardened with hardfacing 15. The other configurations are the same as those of the first embodiment.

FIGS. 5 and 6 show a third embodiment. This embodiment is a modification of the first conventional example,
A new scraper 10' according to this invention is attached to the existing scraper 10 of this example.
That is, this new scraper 10' is U-band 1
6 is fastened to the existing scraper 10. The other configurations are the same as those of the first embodiment.

(Effect of the invention) According to this invention, since the opposite ends of adjacent scrapers are brought close to each other in the radial direction of the rotary plate, when scraping the bottom surface of the rotary plate formed by deposits of raw materials with the scraper, this Almost the entire bottom surface of the rotary dish is scraped off by the scraper. Therefore, the bottom surface inside the rotary plate is kept smooth at all times, and a constant rolling motion of the raw material is thus obtained.

Moreover, since the opposing ends of adjacent scrapers are spaced a certain distance back and forth in the rotating direction of the rotary plate,
The raw material scraped off by the scraper passes between both scrapers and is immediately subjected to rolling action on the smooth surface. Therefore, the desired granulator condition can be obtained smoothly and continuously, which is beneficial for granulation work.

[Brief explanation of drawings]

Figures 1 to 3 are a first embodiment of this invention; Figure 1 is a partial front view of the rotary plate; Figure 2 is a sectional view taken along the - line in Figure 1; Figure 3 is a cross-sectional view of Figure 1; 4 is a second embodiment and corresponds to FIG. 2, FIGS. 5 and 6 are a third embodiment, and FIG. 5 is a plan sectional view of the scraper, and FIG. is − in Figure 5.
The line arrow views, Figures 7 and 8 are the first conventional example and the seventh
The figure is an overall front view of the granulator, and Figure 8 is the same as Figure 7.
9 and 10 are the second conventional example, FIG. 9 is a partial front view of the rotary plate, FIG. 10 is a sectional view taken along the line X--X in FIG. 9, and FIG. The figure is an explanatory diagram of the conventional operation. 1... Granulator, 3... Rotating plate, 3a... Bottom surface,
5...Scraping device, 8...Support stand (stationary side member),
10, 10'...Scraper, 10a...Opposite end.

Claims (1)

[Scope of utility model registration request] In the scraping device of a rotating plate type granulator, a plurality of scrapers are provided facing the inner surface of a rotating plate and arranged in a direction transverse to the direction of rotation of the inner surface of the rotating plate, and these scrapers are supported on a stationary side member. Scraping of a rotary plate type granulator, characterized in that opposing ends of matching scrapers are brought close to each other in a direction transverse to the direction of rotation of the inner surface of the rotary plate, and are spaced at a predetermined distance from front to back in the direction of rotation of the inner surface of the rotary plate. Device.