JPS595820B2 - Powder and granule dryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a powder or granule dryer that dries objects to be dried while rolling and flying them by gyroscopically moving a disk having a baffle.

Although various powder and granule dryers have been developed in the past, there is still no known one that completely solves problems such as drying efficiency and generation of lumps.

For example, discs each having a drop opening in the radial direction and having a large number of ventilation holes are stacked in multiple stages via a cylindrical frame,
There is a known method in which an oscillator is used to apply torsional and vertical vibrations to the entire disk, vibrating the object to be dried while moving it in the circumferential direction, and drying the object by blowing hot air from the lower part of the disk. -27639).

However, this method was insufficient in imparting mobility to the material to be dried, and there were problems in the generation of lumps, and there were also problems in thermal efficiency.

On the other hand, there is also known a method in which a long base plate with a large number of ventilation holes and a corrugated panfur is vibrated with a vibrator, and hot air is sent from the bottom of the plywood to dry it (JP-A-53 -69973).

However, this dryer also did not provide sufficient mobility to the material to be dried, and still had problems with thermal efficiency and generation of lumps.

The present invention has been made to solve these problems, and includes a baffle provided on the disc and a gyro transfer device known as a drive device for a sieving machine (see below). It has characteristics.

In other words, by making this disk move gyroscopically,
The baffle, which was conventionally limited to reinforcing the base plate and regulating the moving speed of the dried material, has been given a new function of improving the rollability of the dried material and giving it flying properties, thereby solving the above problems. As a result, the present invention was completed.

That is, in the present invention, a plurality of baffles are provided radially on a disk having a drop opening in the radial direction and a large number of ventilation holes, and a wall portion is provided on the outer periphery of the disk. Powder and granule drying comprising a baffle plate and a gyroscopic movement mechanism that revolves the baffle plate in a circular orbit, and configured such that hot air passes through the ventilation holes from bottom to top. It's about machines.

The details of the present invention will be explained below with reference to the drawings.

The device shown in the drawings shows one embodiment of the present invention, and FIG. 1 is a front view of the main part with the outer wall partially cut away, and FIG. 2 is a plan view of the baffle plate with ventilation holes omitted. , FIG. 3 is a cutaway view of the baffle plate at position A, and FIG. 4 is a cutaway view of the main part of the gyro transfer device.

Note that the lower part of the screen in the left half of FIG. 1 is shown in a sectional view.

In the baffle dish 12 of the present invention, a plurality of baffles 4 are provided radially on a disk 3 having a drop opening 1 in one or more directions in the radial direction and having a large number of ventilation holes 2. A wall portion 5 is provided on the outer periphery of.

The drop opening 1 may be in one direction or in several directions.

In the case of several directions, they are provided at equal intervals unless there is a special purpose, for example, in the case of two directions, they are provided at 180°, and in the case of three directions, they are provided every 120°.

In the illustrated case, there is one drop port in one direction, but a plurality of drop ports may be arranged.

In the drawing, a weir plate 6 is provided.

This restricts the powder and granules that have moved while rolling on the disk and reached the drop port from jumping over the drop port and being recirculated, but this is not essential in the present invention.

It is preferable that the ventilation pores 2 be as large as possible to the extent that powder and granular materials do not fall during operation.

Since hot air blows up through these ventilation pores, powders and granules can be retained even if the diameter of the pores is larger than the diameter of the powders and granules.

It is best to determine the optimum diameter by conducting experiments in advance, as it varies depending on the size, specific gravity, shape, ventilation speed, etc. of the powder or granular material.

In the examples, powder and granules with an average particle size of 0.6 mm were dried in circular holes with a diameter of 1 mm.

The shape of the pores is not limited to a circle, but can take various shapes such as a rectangle and an S-shape.

The baffle 4 receives the action of gyroscopic movement to improve the transferability of powder and granular materials, and also makes the powder and granular materials fly to increase the porosity, and further adjusts the moving speed to improve drying of the powder and granular materials. It is something that makes you familiar.

In order to achieve this effect, the slope on the side in the direction of travel needs to be gentler than the slope on the opposite side. The angle is preferably about 50 to 70 degrees.

The size and shape arrangement of this baffle vary depending on the radius of rotation of the gyro motion, the number of rotations, the flying ability of powder and granular materials, etc., and are therefore preferably determined by conducting experiments in advance.

The baffle of the embodiment has a triangular shape with slopes of 30° and 60°, and a height of 10 mm.

In addition, the panful spacing should be less than twice the rotation radius of 25 mm.
That is, it is 50 mm or less.

The wall portion 5 on the outer periphery of the disk is used to prevent powder and granular materials from falling and to prevent dry hot air from escaping.

The number of baffle plates may be one level, but from the viewpoint of thermal efficiency, it is preferable to use several to 10 levels stacked one on top of the other.

In this case, it is preferable to shift the drop openings of each stage and stack them so that the powder or granular material goes around each stage once and then falls to the next stage.

The hot air is made to pass through the ventilation pores from the bottom to the top in order to increase the flying ability of the powder particles and to utilize the hot air effectively.

In the drawing, 7 is a blower pipe, and 8 is an exhaust pipe.

The apparatus of the embodiment has drying and sieving functions integrated.

9 is a hot air rectification chamber, 11 is a raw material supply port, and 13 is a powder.
This is a particulate matter outlet.

14 is a screen, 15 is a discharge port for powder and granular material passing through the screen, 16 is a connecting member with a gyro transfer device, and 17
is the gyro transfer top plate.

In the illustrated gyro transfer device, the drive of a pulley 18 is transmitted to three gears 19, and an eccentric shaft 21 moves circularly through a crank arm 20 connected to the shaft of the gears, causing a gyroscopic movement of the top plate 17. .

22 is a balancer. In FIG. 4, the upper half of the middle rolling portion of the three is omitted.

This gyro shifting device is connected to a gyro shifting top plate portion 17 at the lower end of the main body shown in FIG. 1, and causes the entire main body shown in FIG. 1 to gyroscopically move.

As is clear from the drawings, the gyroscopic motion here involves only revolution and no rotation.

In the present invention, it is sufficient that the gyro transfer device is capable of gyroscopically moving the baffle plate, and it goes without saying that it is not limited to what is shown in the drawings.

The dryer of the present invention has very good mobility of the material to be dried even in a wet state, so compared to a conventional fluidized fluidized dryer, a fluidized fluidized dryer requires a large amount of hot air, and also requires stirring because the raw materials become lumpy. Although a mechanism may be attached, the device of the present invention can save a large amount of hot air, and since it has good mobility, no lumps are formed, and a stirring mechanism is not necessary.

Furthermore, compared to a vibration dryer, the device of the present invention has good mobility of granules, so there is no problem of caking, and the heat transfer coefficient is large, so the throughput per unit area is large (the installation area is also large). Can be reduced to width.

Since the apparatus of the present invention can be easily disassembled and cleaned, it is particularly suitable for drying powders and granular materials such as foods that require sanitary maintenance.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a front view of the main part of an apparatus showing an embodiment of the present invention with a part of the outer wall section cut away; Fig. 2 is a plan view of a baffle plate with ventilation holes omitted; FIG. 3 is a cross-sectional view of the baffle plate at position A, and FIG. 4 is a cross-sectional view of the essential parts of the gyro transfer device. 1... Fall port, 2... Ventilation hole, total.
...Disk, 4...Bread 7/1/, 5...
・-・WL12・・・・Baffle plate, 7・・・・
・Blow pipe, 8...Exhaust pipe.

Claims (1)

[Claims] 1. A baffle dish in which a plurality of panfurs are provided radially on a disk having a drop opening in the radial direction and a large number of ventilation holes, and a wall is provided on the outer periphery of the disk, and A powder and granule dryer characterized in that it has a gyroscopic movement mechanism that revolves this baffle on a circular orbit, and is configured so that hot air passes through the ventilation holes from the bottom to the top.