JPS6311588Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a drying device used for drying materials such as synthetic resin chips and other powder and granular materials.

Taking polyester resin as an example, during the manufacturing and molding processes of polyester, polymerized chips must be dried because they contain water. However, since these chips are in a non-crystalline state, even if they are heated as they are, the chips will fuse and become lump-like and solid, making them impossible to handle. On the other hand, if the chips are molded without drying, the water content will be hydrolyzed and the physical properties will be extremely deteriorated.

Therefore, in the manufacturing or molding process of this polyester resin, it is necessary to heat the polyester chips so as not to fuse them, to give them a certain level of crystallinity or higher, and to dry them to remove the moisture content.

Conventionally, raw material manufacturers have performed the crystallization and drying operations in batches using large-capacity vacuum rotary dryers. However, according to this method, the batch processing time was long and the loss time was large. It also required energy consumption such as large equipment and power sources. On the other hand, raw materials are limited to crystallized ones, which is inconvenient not only for raw material manufacturers but also for raw material processors.

This invention is based on a drying device that stirs the material by blowing heat from a heating means into a drying container equipped with stirring blades using a blower. It consists of a large number of combinations with horizontal blades, and a suitable number of these stirring blades have surfaces that the material comes into contact with are sloped surfaces that are at an angle with respect to the horizontal or vertical direction, and furthermore, the sloped surfaces of the horizontal blades are such that the material is By scooping up and stirring in the upward direction, and arranging the vertical blades so that the inclined surfaces gather in the direction of the axis of rotation for stirring, the above-mentioned inconveniences and inconveniences are not only eliminated, but also the material to be dried is prevented from adhering to the material. The objective is to provide a product that eliminates deformation and deformation and can respond to physical properties.

An embodiment of this invention will be described below based on FIGS. 1 to 6.

1 is a drying container for crystallizing and drying materials such as polyester chips, or simply drying other materials, and includes a lower container 1a fixed on a base 2, and a lower container 1a erected on top of this lower container 1a. A material supply hopper 3 having a material input port 3a formed in the upper part thereof is erected on the upper surface near the circumference of the upper container 1b. Although a cyclone is provided as the material supply hopper 3 in this embodiment, it is not limited to this. 3
b is an exhaust stack.

4 is a heating means consisting of a steam heater 5 and an electric heater 6, and the heat generated by this is sent from the side of the lower container 1a through a hot air pipe 8 by a blower 7 connected to the front part thereof. There is. A funnel-shaped perforated plate 9 is provided in the lower container 1a to disperse the hot air.

An exhaust pipe 10 is provided on a part of the upper surface of the upper container 1b.
The tip of this exhaust pipe 10 is connected to a dust collector 11 (back filter in this embodiment). A communication pipe 12 is installed at the top of the dust collector 11.
A duct 13 is installed horizontally from the left to the right through the airflow control valve 1.
4. It is connected to the air intake port of the blower 7 via a short pipe 15 and a suction filter 16. 17 is a drive motor for the blower 7. Therefore, the heat from the heating means 4 is transferred to the hot air pipe 8, the drying container 1, the exhaust pipe 10, the dust collector 11, the communication pipe 12, the duct 13, the short pipe 15, and the suction filter 16 by the air blowing from the blower 7. After passing through the air one after another, it is fed into the air intake port of the blower 7 and circulated. If the configuration is such that the hot air is circulated and reused, it is possible to save energy for supplying the hot air.

Inside the drying container 1, there is a rotating shaft 22 of a stirring blade.
Stirring blades 20 consisting of a large number of combinations of vertical blades that are approximately parallel to the line and horizontal blades that are approximately perpendicular to the line are attached, and a suitable number of these stirring blades 20 have a surface that touches the material horizontally or The surface is inclined at an angle to the vertical direction. In this embodiment, this inclined surface A has an inclination as shown in FIG. Reinforcement of the sloped surface A is being carried out using plate rotors. However, this reinforcing plate B may be omitted.

To explain the above-mentioned stirring blade 20 in detail, the fourth
As shown in the figure, the stirring blades 20 are attached at an asymmetrical position on a rotating shaft 22 connected to a rotating shaft 18 rotated by a chain transmission mechanism 21 driven by a motor, and the stirring blades 20 have different lengths and Horizontal blades a, b, with triangular cross sections as shown in Figure 5,
c, d, e, f, and a vertical blade m whose cross section connected between the tips of a and b is approximately semicircular as shown in FIG.
, a vertical blade n whose cross section is the same shape as the m, and flat horizontal blades o and p, which are installed near the center of the c.
, horizontal blades q and r made of double flat plates, and spiral blades S, S ₁ and S ₂ .

Moreover, the inclined surfaces A of the horizontal blades a to f scoop up the material in the upward direction and stir it, and the inclined surfaces A of the vertical blades m and n gather the material in the direction of the axis of rotation 22 of the stirring blades and stir it. It is arranged. The spiral blades S, S ₁ and S ₂ scoop up the material near the outlet 1c of the drying container 1 in the upward direction and stir it. Therefore, the inclined surfaces A of the horizontal blades a to f and the spiral blades S, S ₁ , S ₂
Together, this prevents the material near the outlet 1c from clogging, and raises and stirs the material. The lifted material is gathered at the upper center by the action of the inclined surfaces A of the vertical blades m and n, then moved downward, and then moved upward again. Since the material is convected in this way, uniform stirring and drying are performed.

Further, the outer ends of the horizontal blades d, e, and f corresponding to the funnel-shaped perforated plate 9 in the drying container 1 are all connected to the same perforated plate 9.
It is placed close to the inner wall, thereby preventing material from adhering to the perforated plate 9.

Note that the stirring blade 20 can also be configured as shown in FIG. 7. This device has a long horizontal blade t, which has a triangular cross section and is approximately perpendicular to the rotation axis 22 line, and a short horizontal blade u, which have a triangular cross section and are approximately perpendicular to the line of the rotation axis 22, and a short horizontal blade u, which are disposed asymmetrically on both the left and right sides of the rotating shaft 22 of the stirring blade, as shown in FIG. At the same time, the tops of bent vertical blades x, y whose cross sections are approximately semicircular as shown in FIG. 6 are connected to the tips of both horizontal blades t and u, and both vertical blades x ，
The cross section of the lowest end of y and a little above it is the 5th
It is made by connecting triangular horizontal blades w and v as shown in the figure. In this case, the vertical blades x and y are also brought close to the inner wall of the perforated plate 9 at the bottom of the drying container 1 to prevent material from adhering to the perforated plate 9.

Incidentally, a structure without the horizontal blade v can also be implemented.

The vertical blades m, n, x, and y are not limited to the illustrated shape, and may also be inclined with respect to the axis of rotation. Also, the horizontal blades a to f, t, u, v,
w is not limited to the one shown in the drawings, but also includes one having an inclination with respect to the axis of rotation, or one having a curve.

According to the configuration of the stirring blade 20 shown in FIGS. 4 and 7, no compression or shearing force is applied to the material, which prevents the material from forming into lumps, and also prevents the material from forming in a drying container. Even when the stirring blade is filled to 100%, all parts move, and furthermore, there is an advantage that there is little resistance at the intersection between the vertical blade and the horizontal blade of the stirring blade.

The temperature of the heating means 4 can be adjusted in multiple stages or more by a temperature control device 23. 24 is a thermometer. According to such a configuration,
Since rapid temperature rise can be avoided, it is possible to avoid the co-rotation phenomenon with the stirring blade when the materials are fused, which occurs particularly in the case of a large capacity. In addition, hot air at an appropriate temperature can be supplied depending on the physical properties such as viscosity of the material.

Note that the chain transmission mechanism 21 is connected to the sprocket 2.
5, 26, a roller chain 27, and a drive source, and 28 is a speed reducer.

30 is a steam pipe, 31 is a valve, 32 is a strainer, 34 is a solenoid valve, 35 is an automatic gate valve attached to the bottom of the material supply hopper 3, 36 is a limit switch, 37 and 38 are cleaning ports, 39
4 is a level window, 40 is a level meter, 41 is a slide damper, and 42 is a material outlet, to which a molding machine, main dryer, etc. for the next process are connected. 43 is a terminal box, 44 is a diaphragm valve, 45 is a solenoid valve, 46 is an accumulator, 47 is an inspection door,
48 is the outer case of the dust collector, 49 is the air filter, 50 is the dust hose, 51 is the dust outlet,
52 is a filter bag, and 53 is a chain cover.

Incidentally, the heating means 4 is not limited to the one in the embodiment, but is arbitrary.

This stirring blade 20 is not applicable only to the drying container 1 shown in the above embodiment, but can be applied to any drying container. Alternatively, it can also be applied to a stirring tank.

The operation of this embodiment will be explained below by taking as an example the crystallization and drying process of polyester chips as the material.

The stirring blade 20 inside the drying container 1 is connected to a chain transmission mechanism 21.
The polyester chips are supplied from the material input port 3a of the material supply hopper 3 while being rotated through the material supply hopper 3, and a predetermined amount is fed into the drying container 1 by opening the automatic gate valve 35 at the bottom thereof, where the same material is passed through the stirring blade 20. Stir with

On the other hand, the heat from the heating means 4 is transferred by the blower 7.
The hot air comes into contact with the material inside the drying chamber from the lower side of the drying container 1 through the perforated plate 9. Therefore, in the drying chamber of the drying container 1, the horizontal blade a of the stirring blades 20
~f... scoops up the material in the upward direction, and
The vertical blades m, n... are assembled in the direction of the axis of rotation for stirring, and at the same time, a suitable number of these stirring blades have surfaces on which the material comes into contact with inclined surfaces that are angled with respect to the horizontal or vertical direction. , the shearing force and compressive force on the material are eliminated, there is no adhesion or deformation of the material, or the formation of lumps, the material is uniformly stirred, the material (polyester chips) is uniformly crystallized, and water is also removed. , the desired polyester chips are obtained.

When the time set on the timer has elapsed, the slide damper 41 automatically opens and the crystallized and dried material is discharged from the material outlet 42 to the next process, such as a synthetic resin molding machine or main dryer. be done.

Next, in conjunction with the time up of the timer that has set the ejection time, the slide damper 4
1 is closed and the automatic gate valve 35 of the material supply hopper 3 is opened, the material input port 3a is
A predetermined amount of new material is supplied into the drying container 1,
The next cycle of crystallization and drying is carried out.

The air that has exchanged heat with the material in the drying container 1 passes through the exhaust pipe 10 and is purified by the dust collector 11.
The clean air is sent to the suction port of the blower 7 through the communication pipe 12, duct 13, and suction filter 16 for circulation. According to such a configuration,
As mentioned above, since the air that is recycled has residual heat, it has the advantage of saving hot air energy.

FIG. 8 shows an application example in which this drying device is connected to a known vacuum type rotary dryer.

In this system, the material in the flexible container 60 is fed into the material supply hopper 3, and then a certain amount is transported via the transport pipe 65 to the cyclone 66 and into the drying container 1 using compressed air from the air power source 63. 1. Crystallize or dry the material. To remove the processed material, open the slide valve 68 and transfer the material to the switching valve 6.
The air power source 6 is connected to the transport pipe 65 ₁ by the opening operation of 4.
The compressed air of No. 3 is sent in, passes through a cyclone 69, and is stored in a storage tank 70. In that case, the air discharged from the exhaust ports 66 ₁ and 69 ₁ of the cyclones 66 and 69 is supplied to the dust collector 72 and then
The air is cooled by the cooler 73, fed into the suction port of the air power source 63, and circulated again for use.

The lower part of the storage tank 70 is connected to a known vacuum rotary dryer 74 via a transport pipe 65 ₂ and a feeder 82 . And transport pipe 6
An air transport pipe 76 for supplying pressurized air from an air power source 75 is connected to the middle of the air pump 5 ₂ . Therefore, the treated material in the storage tank 70 is sent to the vacuum rotary dryer 74 via the transport pipe 65 ₂ by opening the valve 71, and is also dried in this dryer 74. Here, the dried material is transferred from a discharge port 77 to a product storage tank 8 via a cyclone 79 by compressed air from an air power source 75.
sent to 0. The product is stored from this product storage tank 80 in a storage container 81 such as a flexible container.
Exhaust ports 79 ₁ , 8 of cyclone 79 and feeder 82
2 ₁ is connected to the dust collector 72 via exhaust pipes 83 and 84.
and the exhaust port 72 of the dust collector 72.
₁ is connected to the suction port of the air power source 75 via a cooler 85, and used air is circulated and reused. 86 is a dry air supply pipe.

This idea consists of the above structure,
In a drying device that stirs the material by blowing heat from a heating means with an air blower into a drying container equipped with a stirring blade, the stirring blade has a plurality of vertical blades substantially parallel to the axis of rotation and horizontal blades substantially perpendicular to the axis of rotation. In addition, since an appropriate number of these stirring blades have surfaces in contact with the material that are inclined at an angle to the horizontal or vertical direction, the shearing force and compressive force on the material are eliminated, and the material becomes lumpy. This also prevents material from adhering to or deforming the stirring blade.

In addition, the sloped surface of the horizontal blade is arranged to scoop up and stir the material in the upward direction, and the sloped surface of the vertical blade is arranged so as to collect and stir the material in the direction of the rotation axis. Convection flows from the bottom (outlet) to the top, from the top to the top center, and from the top center to bottom, so that the mixture is uniformly stirred.

Thus, in this invention, the stirring blade is composed of vertical blades and horizontal blades, and is formed with a special inclined surface, so that the stirring and drying of the material is performed uniformly, and the crystallization of the material is prevented. and drying process time can be shortened. That is, to give an example of the crystallization treatment of polyester chips, according to a conventional vacuum rotary dryer, the throughput is 1 ton/
One batch required about 12 hours just for crystallization, but according to this idea, it took about 15 minutes or less for the same amount of processing.
Experimental results showed that crystallization was completed in 60 minutes.

This product has a simple structure and does not take up as much space as conventional vacuum rotary dryers, so if raw material processors install this product, they can crystallize amorphous materials on their own. can.

[Brief explanation of drawings]

The figures all show examples of this invention; Fig. 1 is a front view, Fig. 2 is a plan view, Fig. 3 is a right side view, Fig. 4 is a perspective view of the stirring blade, and Figs. 5 and 6. The figure is a sectional view of a stirring blade, FIG. 7 is a perspective view of a modified example of the stirring blade, and FIG. 8 is a flowchart showing an example of application of the present product. DESCRIPTION OF SYMBOLS 1... Drying container, 4... Heating means, 7... Air blower, 20... Stirring blade, 22... Rotating shaft of stirring blade, 23... Temperature control device, A... Inclined surface, a,
b, c, d, f, t, u, v, w...horizontal blade,
m, n, x, y...vertical blades.

Claims (1)

[Claims for Utility Model Registration] (1) In a drying device that stirs the material by blowing heat from a heating means into a drying container equipped with a stirring blade using an air blower, the stirring blade is substantially parallel to the axis of rotation. It consists of a large number of combinations of vertical blades and approximately vertical horizontal blades, and a suitable number of these stirring blades have surfaces that contact the material with inclined surfaces that are angled with respect to the horizontal or vertical direction, and furthermore, the horizontal blades A drying device characterized in that the inclined surfaces of the vertical blades are arranged to scoop up and stir the material in an upward direction, and the inclined surfaces of the vertical blades are arranged to aggregate and stir the material in the direction of the rotation axis. (2) Utility model registration claim No. (1), wherein the heating means is adjustable by a temperature control device.
Drying equipment as described in section. (3) The drying device according to claim 1 or 2, wherein the hot air sent by the blower is circulated through the blower after use so that it can be reused.