JPS6146386Y2 - - Google Patents

Description

[Detailed description of the invention] This invention arranges perforated plates in multiple stages, and continuously dries the powdered material to be dried by dropping it from the upper perforated plate to the lower perforated plate one after another. The present invention relates to a sealing device for preventing drying gas from blowing through in an apparatus.

A large number of buffles are formed radially on the perforated plate. This baffle is for moving the powder or granular material in a circular direction, and the conventional technology regarding this buffle will be explained.

First, a device was disclosed in which a large number of radial buttholes were installed on a disk, the disk revolved in a horizontal plane, and granulation was carried out by supplying water-containing powder onto the disk (known as gyro motion). No. 28779 of 1977 = Granulation equipment = This Batsuful has a chevron-shaped (triangular) cross section.
The slope of one side of the chevron is different from the slope of the other side, for example, the slope in the direction of rotation of the gyroscope is 30 degrees, and the other side is 60 degrees.

The powder and granules supplied onto the disk will climb up the slope with a small slope and fall down the slope with a large slope due to the inertia of the disk, and the powder and granules will eventually fall onto the disk. It will move in a circular direction at the top. As a result, granulation is performed without the powder particles sticking to the disk.

Utilizing the movement of the powder in the granulator described above, a circular plate is used as a perforated plate to form ventilation holes for drying gas, and the powder is sequentially transferred from the upper stage to the lower stage of the perforated plates arranged in multiple stages. A device that performs drying while being dropped has already been proposed, such as Japanese Patent Application No. 123522 of 1972 (Continuous drying device using multi-stage perforated plates) (Japanese Patent Application Laid-open No. 46972/1983). In this method, annular perforated plates are arranged in multiple stages within a rotating cylindrical case, and the material to be dried is dried while being moved from the top stage to the bottom stage. This equipment requires a means to drop the material from the top to the bottom, with each perforated plate except the bottom having radial rectangular drop openings that guide the material onto the next perforated plate. A drop tube is provided to hang down from the lower surface of the drop opening, and its lower end opens slightly away from the perforated plate of the next stage. Therefore, the drop openings in the next stage and below are provided in a staggered manner from the drop openings in the upper stage. Since the lower end of this drop tube is open, it is necessary to seal it with a material.

Drying gas is supplied below the bottom perforated plate,
The drying gas flows upward in sequence and passes through each perforated plate, drying the material moving on the perforated plate.The drying gas passes through the small holes from the entire bottom surface of each perforated plate. , will rise sequentially.

In order for this to happen, the pressure in the space between each perforated plate must be higher as it goes downward, and there is a pressure difference between the upper and lower surfaces of each perforated plate. In this state, the drop tube has a hanging opening, so the dry gas tends to blow upward from the lower opening of the drop tube. The opening at the bottom of the drop tube is sealed so that the material remains and the material always accumulates between the lower end of the drop tube and the perforated plate below it, and the space above and below the perforated plate is not communicated by the drop tube. I have to keep it.

As described above, since continuous drying work is performed in a state of being sealed by the lightweight material itself, care must be taken in the magnitude of the blowing pressure of the drying gas.

If the pressure difference between the top and bottom of the perforated plate becomes too large, the material inside the drop tube will no longer be able to fall and will be pushed upwards, and the top and bottom of the perforated plate will be connected by the drop tube, drying upward from the bottom end of the drop tube. The gas will cause a short circuit, so you have to make sure that this doesn't happen.

However, during operation under constant blowing pressure, there are fluctuations in the supply of material, and if the supply rate decreases, it becomes impossible to continue the operation.

In other words, when the material is wet, it is difficult to keep the supply amount constant, and if the supply amount fluctuates and decreases, the amount of material remaining in the drop tube of the top perforated plate will decrease. Due to the pressure difference between the dry air on the upper and lower surfaces of the perforated plate, the remaining material is pushed upward, and the gas in the space below the perforated plate rises through the drop tube. When this happens,
The falling of the material is obstructed, and even if a very small amount of the supplied material falls from the drop tube, most of it remains on the perforated plate.
As a result, the air resistance due to the material on the perforated plate increases, and the tendency of the gas to rise in the drop tube increases, making it difficult for the material to fall, and eventually the operation is stopped.

The present invention attempts to solve the above-mentioned problems, and when the amount of material in the drop tube decreases, the opening of the drop tube is mechanically closed so that gas does not rise inside the drop tube. This is how it was done.

In the present invention, the drop tube in the drying device as described above has an opening at the lower end that is closed, and instead of the opening, the side surface is open, the cross section is U-shaped, and the lower end is bottomed. There is. A closing plate for opening and closing the opening is provided on the open surface. The upper end of this sealing plate is fixed to the lower surface of the drop port and hangs down to cover the open surface, and the lower portion is swingable to open and close the open surface. Accordingly, the material moves on the perforated plate, falls through the drop opening into the drop tube, and is deposited on the bottom plate. On the other hand, the sealing plate whose lower part is swingable tends to be pressed against the open surface of the drop tube due to the pressure difference between the gas above and below the perforated plate. The deposited material is subjected to an inertial force due to gyroscope motion. As the amount of accumulation increases, the inertial force also increases, and as it tries to fall from the open surface, it pushes away the sealing plate.

When the accumulation of material in the drop tube increases in this state, the material pushes open the sealing plate and falls downward.
Once a certain amount has fallen, the sealing plate is pressed against the open surface, interrupting the falling of the material. The drying process continues with repeated short drops and interruptions.

In order to improve the above-mentioned drawbacks, the present invention is designed to perform sealing by accumulating powder and granules in the falling tube. For this purpose, the drop tube is equipped with a bottom plate and has a bottom, the drop tube has a U-shaped cross section with one side open, and a sealing plate is attached to cover the open opening. The upper end of the plate is fixed to the upper part of the opening surface, and the lower part is swingable. Therefore, the powder and granules accumulate in the drop tube, and when the amount exceeds a certain amount, some of them push open the sealing plate and fall downward from the drop tube. The closing plate closes the open surface and blocks the passage.

Embodiments of the present invention will be described with reference to the drawings.

1 is a cylindrical case, and inside thereof, five annular perforated plates 2, 3, 4, 5, and 6 are arranged at equal intervals in multiple stages, and the outer periphery of each perforated plate is aligned with the inner periphery of the cylindrical case 1. It is fixed. A material supply port 7 and a hot air discharge port 8 are provided on the top wall of the cylindrical case 1 near the outer periphery. An opening is provided in the center of the top wall, and the lower end of the hot air supply pipe 9, which is fixed by passing through the opening and the center opening of the annular perforated plates 2, 3, 4, 5, and 6, is connected to the lowermost perforated plate. 6 is open toward the bottom wall of the cylindrical case 1. A material discharge port 10 is provided on the peripheral wall of the cylindrical case 1, located above the upper surface of the lowest perforated plate 6, and a material discharge pipe 11 is connected to the material discharge port 10.

Although not shown on the bottom surface of the cylindrical case 1,
A gyro motion drive device is provided, the bottom wall of the case 1 is rotatably supported by a plurality of vertical eccentric shafts, a plurality of interlocking gears are fixed to the lower end of the eccentric shaft, and the interlocking of the gears causes the cylindrical case 1 to move freely. does not rotate itself in the horizontal plane but revolves around a constant radius.

As shown in FIG. 2, the uppermost perforated plate 2 is a circular plate in which a large number of small holes (not shown) are formed, and a circular opening is formed in the center. On the perforated plate 2,
A large number of buttresses 12 extending radially from the central circular opening to the outer circumference are provided at equal intervals, and have a triangular cross section, with two hypotenuses protruding in a chevron shape, and one hypotenuse having an inclination of about 30° with respect to the disk. The angle is small, and the other hypotenuse is a large angle of about 60° (in the figure, the wide side of Batsuful 12 has a smaller inclination, and the narrower side has a larger inclination). Therefore, the granular material moves in the direction of the arrow due to the gyroscope motion.

A falling opening 13 that spreads radially is provided at one location on the disk, one side of which is in contact with the buttful 12, and a weir plate 14 that projects higher than the buttful 12 radiates from the other side (forward in the direction of movement of the powder). extending in the direction. The above is the same as that of the above-mentioned Japanese Patent Application No. 1235522 of 1982 (Japanese Unexamined Patent Publication No. 56-46972). Next, the upper end of a bottomed drop tube 15 having a U-shaped cross section is welded to the lower surface of the drop opening 13, as shown in FIGS. 3 and 4. The drop tube 15 has a U-shaped cross section with one end being shorter, similar to the drop opening 13, and the drop tube 15 hangs downward, and the bottom plate 17 at its lower end is connected to the next perforated plate in FIG. It is close to the top surface of 3. A sealing plate 18 is disposed on the open surface of one side of the drop tube 15, and this is a rubber plate, and its upper end is connected to the lower surface of the perforated plate 2 on one side of the drop opening 13 (where the drop tube 15 is fixed). It is fixed to a support plate 19 which is fixed to a support plate 19 (the part that is not attached), and the lower part of the fixed part is swingable so as to close the open surface of the drop tube 15.

Perforated plates 3, 4, 5 below the second stage in Fig. 1
The only difference is the position of the drop opening, and the drop tube 15 of the perforated plate 3 of the second stage is on the left side in FIG.

The perforated plate 3, like the perforated plate 2, has a perforated circular plate with a baffle 12 provided thereon. The falling opening 16 is located at the rear of the falling opening 13 of the perforated plate 2 of the first stage in the moving direction of the powder and granular material. and perforated plate 2
Similarly, a weir plate 14 is provided on one side of the drop opening 16.

In a state where the first stage perforated plate 2 and the second stage perforated plate 3 are arranged vertically as shown in FIG.
Falling opening 13 of the perforated plate 2 of the tier and the perforated plate 3 of the second tier
The falling opening 16 of the perforated plate 2 is at a different position as shown in FIG.
It will be between. Similar to the perforated plate 2, a drop tube 15 is fixedly suspended from the lower surface of the drop opening 16 of the perforated plate 3.

The third and fourth stage perforated plates 4 and 5 are similar to the perforated plate 3, and the positions of the falling openings 16 are shifted rearward in the flow direction of the powder and granular material.

The lowermost perforated plate 6 does not have the drop opening and drop tube of the upper perforated plate, and has a full 22
is provided, and has a weir plate 14 corresponding to the falling tube 15 of the perforated plate 5 in the upper stage. It touches one side.

To carry out the drying work, the cylindrical case 1 is driven by a gyroscope drive device, the powder to be dried is continuously supplied from the material supply port 7, and the upper end of the hot air supply pipe 9 is connected to a hot air source through a flexible pipe. Hot air is supplied into the cylindrical case 1 while communicating with the cylindrical case 1.

After the hot air blows out from the bottom surface of the lowest perforated plate 6, it turns around and ascends from the small holes in the perforated plate 6 sequentially through the small holes in the perforated plates 5, 4, 3, and 2 above it, The hot air is discharged from the hot air outlet 8 to the outside.

The supplied powder falls onto the top perforated plate 2, and the hot air rising from below prevents the fine powder from falling from the small holes.In this state, the perforated plate 2 By rotating, it moves in a circular direction (arrow) as shown in Figure 2 while repeatedly passing over the small slope of the Batsuful 12 and falling down the large slope. It is hung to dry. As a result of movement in the circular direction, when it reaches the drop opening 13 as shown by the arrow, it falls from the drop tube 15 to the perforated plate 3 at the next stage. At this time, drop opening 1
The granular material trying to pass through 3 collides with the weir plate 14.

The powder particles that have fallen into the drop tube 15 are deposited on the bottom plate 17, and when a certain amount of accumulation is reached, the inertial force generated on the powder particles due to the gyroscope movement is applied to the rubber sealing plate 18.
Push open the lower end and fall onto the perforated plate 3 on the lower stage. At this time, the hot air is blocked by the powder while the powder is falling, and when the amount of accumulated powder decreases due to the fall, the sealing plate 18 completely blocks the open surface of the falling tube 15. do. At this point, the falling of the granular material to the next stage is interrupted, and in this state, the granular material continues to move on the perforated plate 6, and the granular material is transferred to the falling tube 17.
As the liquid continues to fall and accumulate, the sealing plate 18 is pushed open.
The fallen powder and granules move in a circular direction passing over a large number of buttfuls 12 one after another, and reach the falling opening 1 of the perforated plate 3.
6, it falls from the falling tube 15 onto the perforated plate 4 of the next stage in the same manner as described above. Perforated plates 4 and 5 below
, repeat the same process while moving in a circular direction and falling. The material moves sequentially in a circular direction on the lowest perforated plate 6, and at the end thereof is guided to the material discharge port 10 by the weir plate 14, and is discharged through the material discharge port 11 while maintaining airtightness by a rotary valve or the like.

In this case, each drop opening 16 of the perforated plates 3, 4, 5
..., is a position shifted backward by one pitch of the buttful 12 in the direction of movement of the powder and granular material with respect to the falling port of the upper stage, and the falling powder and granular material from the upper stage and the sealing plate are located one pitch in front of each falling port. 18, each of the perforated plates 2, 3, 4, 5, and 6 is completely covered with a powder layer without hot air blowing through.

On the other hand, as mentioned above, hot air is supplied from the lower end of the hot air supply pipe 9, and as mentioned above, each of the perforated plates 2, 3, 4,
5, 6 are covered with a powder layer that moves in a circular direction, and the hot air does not blow through each perforated plate 6, 5, 4,
The hot air rises in the order of 3 and 2 from below to above while contacting the powder and granules, and is finally discharged to the outside from the hot air outlet 8.

In the above explanation, the bottom plate 17 of the drop tube 15 is horizontal, but if the specific gravity of the powder or granular material is small, the inertial force will be small and the force to push and spread the sealing plate 18 will be insufficient. The bottom plate 17 may be tilted so that the gravity of the powder also acts on the sealing plate 18.

Further, although the example of the sealing plate 18 is a rubber plate has been described, the upper end of the metal plate may be fixed with a hinge, or two plates may be connected with a flexible piece and the bottom portion may be swingable. good.

As explained above, in the present invention, the falling tube has a bottom with a U-shaped cross section, and the material falls while the open surface is covered with a sealing plate, so that the material is securely dropped. The lower part of the sealing plate provided on the open surface of the drop tube is swingable, and the material deposited in the drop tube pushes the sealing plate open and falls. is carried out smoothly,
After that, the sealing plate automatically seals the open surface, so
Its operation is quick and reliable, and it is possible to work continuously for a long time with intermittent dropping of material. Further, in order to increase the throughput per hour, it is possible to work by increasing the pressure of the drying gas.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention,
The figure is a schematic cross-section with some parts omitted, Fig. 2 is a plan view of the top perforated plate, and Fig. 3 is a partial side view (cross-section).
4 is a cross-sectional view taken along line A-A in FIG. 3. 1 is a cylindrical casing, 2, 3, 4, 5, and 6 are perforated plates, 12 is a baffle, 13 and 16 are drop openings,
14 is a sheathing, 15 is a drop tube, 17 is a bottom plate, 18
is a sealing plate.

Claims (1)

[Scope of utility model registration request] In a continuous drying device, perforated plates with buttfuls are arranged in multiple stages in a cylindrical casing equipped with a revolving drive device, and each perforated plate except the lowest stage has drop tubes hanging below the drop openings in a staggered manner. The drop tube is U-shaped in cross section and has a bottom, and a sealing plate is provided on its open surface, the upper end of the sealing plate is fixed to the lower surface of the drop opening, and the lower part is swingable. A sealing device for continuous drying equipment using multi-stage perforated plates.