JPH0717448Y2 - Waste plastic processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a waste plastic processing apparatus for heating and melting waste plastic and cooling and solidifying it, and particularly to an apparatus suitable for processing waste expanded polystyrene. .

[Conventional technology]

A known waste plastic processing apparatus of this kind preheats a waste plastic piece introduced from a waste plastic inlet, and melts and reduces the volume of the waste plastic piece by hot air arranged below the preheat chamber. It is provided with a melting furnace, a hot air generator for supplying hot air to the melting furnace, and a container arranged below the melting furnace for receiving the molten waste plastic. The waste plastic pieces are heated and melted by the hot air supplied from the hot air generator to the melting furnace and fall into the container.

[Problems to be solved by the device]

In the case of this conventional waste plastic processing apparatus, since the connecting tubular suction port of the exhaust fan (exhaust blower) is directly connected to the preheating chamber, the suction force in the suction port range is strong.
Therefore, there is a drawback that small waste plastic pieces are sucked from the preheating chamber to the suction port and discharged together with the hot air. Note that if the suction force of the exhaust fan is weakened, the amount of the small pieces of waste plastic sucked in will decrease, but the exhaust will not be sufficient, so there is the drawback that a bad odor will be emitted around the processing apparatus.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and an object thereof is to provide a waste plastic processing apparatus that does not suck and discharge small waste plastic pieces together with hot air and enables sufficient exhaust of hot air. Is to provide.

[Means for Solving the Problems]

In order to achieve this purpose, a preheating chamber that preheats the waste plastic pieces that are input from the waste plastic input port, and a melting furnace that is arranged below the preheating chamber that melts and reduces the volume of the waste plastic pieces by hot air. The waste plastic processing apparatus according to the present invention, which comprises a hot air generator for supplying hot air to the melting furnace and a container for receiving the molten waste plastic, which is arranged below the melting furnace, is disposed above the preheating chamber. An air exhaust chamber is formed by a partition plate, a hot air inlet is formed at one end of this air exhaust chamber, and the other end is connected to the intake port of the exhaust fan, and the cross-sectional area of the inlet of the exhaust air chamber is the intake port of the exhaust fan. It is characterized by making it larger than the cross-sectional area of.

In this case, the partition plate is inclined so that the inlet side of the hot air is higher than the intake port side of the exhaust fan, and the exhaust port for waste plastic pieces that leads from the exhaust chamber to the preheating chamber is located on the intake side of the partition plate. It is desirable to form within the range.

Further, it is desirable to provide a suction force adjusting plate composed of a perforated plate, a lattice plate, a mesh plate or the like in the range of the inlet of the exhaust chamber.

Furthermore, between the waste plastic input port and the exhaust chamber inlet,
It is desirable to provide a baffle.

[Action]

In the case of the waste plastic processing apparatus according to the present invention, since the cross-sectional area of the inlet of the exhaust chamber is made larger than the cross-sectional area of the inlet of the exhaust fan, the suction force in the range of the inlet of the exhaust chamber is relatively small. become weak.

Further, since the partition plate is provided with the discharge port, the small pieces of waste plastic are returned from the air discharge chamber to the preheating chamber.

Furthermore, since the suction force adjusting plate is provided in the range of the exhaust chamber inlet,
The suction resistance at the inlet of the exhaust chamber can be adjusted.

Furthermore, between the waste plastic input port and the exhaust chamber inlet,
Since the baffle plate is provided, the waste plastic pieces injected through the waste plastic injection port are not directly sucked into the air exhaust chamber.

〔Example〕

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a vertical section of a waste plastic processing apparatus according to an embodiment of the present invention. The outer wall of this waste plastic processing equipment is composed of three parts 1a, 1b, 1c. The outer wall portions 1a, 1b, 1c are fixedly connected to each other by fastening their flanges with bolts. Outer wall part 1a, 1
The horizontal cross sections of b and 1c are rectangular in the illustrated embodiment, but may be square or circular.

In the outer walls 1a, 1b, 1c of the waste plastic processing apparatus, there is a preheating chamber 3 for preheating the waste plastic pieces 2 that have been input,
A funnel-shaped melting furnace 4 formed below the preheating chamber 3,
A container 5 having an open top is provided below the melting furnace 4 for receiving the molten waste plastic. In the melting furnace 4, the waste plastic pieces 2 are melted by the hot air supplied from the hot air generator 6 arranged outside the outer walls 1a, 1b, 1c.

On the upper left slanted wall of the outer wall portion 1a on the upper side, a waste plastic charging port 7 for charging the waste plastic pieces 2 which have been roughly crushed in advance to the processing apparatus is provided.

A preheating chamber 3 for preheating the waste plastic piece 2 and an exhaust chamber 8 for exhausting exhaust gas are formed in the upper outer wall portion 1a. When the waste plastic 2 falls in the preheating chamber 3, it is preheated by the rising hot air. The hot air that preheats the waste plastic pieces 2 further rises and is discharged through the air exhaust chamber 8 connected to the air exhauster (exhaust blower) 9 provided at the top of the preheating chamber 3.

The air exhaust chamber 8 is formed so as to be surrounded by the inner surface of the outer wall portion 1a and the partition plate 10. The partition plate 10 is inclined downward to the right in FIG. 1 at an angle of about 10 to 30 °, especially about 15 ° with respect to the horizontal. A suction force adjusting plate 12 is detachably attached to a region of an inlet 11 of the exhaust chamber 8. The suction resistance can be adjusted by replacing the suction force adjusting plate 12 and changing the opening cross-sectional area of the inlet 11.
The suction force adjusting plate 12 is made of, for example, a perforated plate, a lattice plate, a net plate, or the like. In the illustrated example, the suction force adjusting plate 12 is mounted by being suspended from the beam 13 that is hung between the inner wall surface on the other side of the outer wall portion 1a and the inner wall surface on the front side, but is attached by other methods. May be. For example, partition plate 10 and outer wall 1a
It may be attached directly to the inner wall surface of. Further, it can be formed in various shapes.

The cross-sectional area of the inlet 11 of the exhaust chamber 8 is larger than the cross-sectional area of the connecting tubular suction port 14 of the air exhauster 9. Therefore, even if the suction force of the exhaust fan 9 is increased, the inlet of the exhaust chamber 8
Since the suction force in the range of 11 becomes weak, the unmelted waste plastic pieces are not sucked into the exhaust chamber 8 from the preheating chamber 3.

In FIG. 1, the right end of the partition plate 10 and the outer wall portion 1a
A discharge port 15 is provided between the inner wall surface and the inner wall surface. Even if small pieces of waste plastic such as beads are sucked into the air exhaust chamber 8, they are exhausted to the preheating chamber 3 again through the exhaust port 15. Immediately above the outlet port 15, a small inclined baffle plate 16 is attached to prevent the extremely small pieces of waste plastic from being sucked into the inlet port 14 of the blower 9.

Between the inlet 11 of the exhaust chamber 8 and the waste plastic inlet 7, a waste plastic piece 2 is further prevented from being directly sucked from the waste plastic inlet 7 to the inlet 11 of the exhaust chamber 8. A plate 17 is provided. This baffle plate 17 is attached almost vertically to the inner surface of the outer wall portion 1a.

Below the preheating chamber 3, a funnel-shaped melting furnace 4 is attached to the inner surface of the central outer wall portion 1b. The melting furnace 4 is for melting the waste plastic piece 2 to reduce its volume. A large number of hot air inlets 18 are formed in the melting furnace 4. Regarding the width of each of the hot air inlets 18, the hot air inlet on the upper side is wide and the width is narrower toward the lower side. Immediately above each hot air inlet port 18, a hot air inlet port covering plate 19 is formed so as to form an acute angle with the inner surface of the melting furnace 4.

A hot air retention chamber 20 is formed between the melting furnace 4 and the outer wall portion 1b, and the hot air retention chamber 20 is connected to the hot air generator 6 via a connecting pipe 21.
It is connected to the. The hot air generator 6 includes a burner and a blower.

The hot air generated by the hot air generator 3 is connected pipe 21, hot air retention chamber 20.
Then, it is introduced into the funnel-shaped melting furnace 4 through the hot air inlet 18. A deflection plate 22 is arranged in the center of the upper portion of the melting furnace 4. In the illustrated embodiment, the deflection plate 22 is suspended and fixed to the partition plate 10 by a rod 22a.

A hot air outlet 25 is formed in the bottom plate 24 of the hot air retention chamber 20 so as to surround the lower end of the melting furnace 4.

A rod-shaped stopper 23 is attached to the lower opening of the melting furnace 4 for holding unmelted waste plastic pieces so as not to drop as much as possible. This stopper 23
Extend radially downward from the lower end of the melting furnace 4.

Below the melting furnace 4, there is provided a container 5 having an open upper part for receiving the melted waste plastic to cool and solidify it. The container 5 can be put in and taken out through a container loading / unloading door (not shown) formed on the lower outer wall portion 1c.

Next, a method of using the waste plastic processing apparatus having the above structure will be described. First, waste plastic such as Styrofoam, polyethylene, polyvinyl chloride, polypropylene, etc. is crushed in advance with a crusher, etc.
To the processor. The waste plastic piece 2 is preheated in the preheating chamber 3 and drops onto the melting furnace 4. The waste plastic pieces 2 are heated in the melting furnace 4 with hot air (the temperature of this hot air is about 300 ° C. when the waste plastic is styrofoam. At 320 ° C. or higher, it decomposes and gives off a bad odor.
It ignites at about 00 ° C) and is melted by heating. that time,
The hot air reaches the inside of the melting furnace 4 from the hot air generator 6 through the connecting pipe 21, the hot air retention chamber 20 and the hot air inlet 18. The waste plastic piece 2 is heated by the hot air and by the conductive heat transmitted from the hot air retention chamber 20 through the wall of the melting furnace 4. Further, since the hot air blown up in the melting furnace 4 hits the deflecting plate 22 and is pushed back to the surface of the melting furnace 4, a large amount of hot air is applied to the waste plastic pieces 2 and the waste plastic pieces 2 are efficiently melted. A small piece of waste plastic such as unmelted beads hits the deflecting plate 22 in the same manner as hot air, and is pushed back downward to be melted. The melted waste plastic falls into the container 5.

The hot air blown out from the hot air retention chamber 20 through the hot air hot air outlet 25 heats and melts the unmelted waste plastic held in the stopper 23 and the unmelted waste plastic dropped in the container 5.

The molten waste plastic collected in the container 5 is taken out together with the container 5 from the container entrance / exit door, and is individualized by natural cooling. By this melting and cooling and solidification, the volume of the waste plastic is reduced to about 1/10.

The hot air that melts the waste plastic pieces 2 rises in the preheating chamber 3 and preheats the waste plastic pieces 2 as described above. Then, the hot air enters the air exhaust chamber 8 through the inlet 11 and is sucked and discharged by the air exhaust unit 9. At that time, since the cross-sectional area of the inlet 11 of the exhaust chamber 8 is larger than the cross-sectional area of the suction port 14 of the air exhauster 9, the suction force at the inlet 11 is weaker than the suction force at the suction port 14. Therefore, even if the suction force of the blower 9 is large, the suction force in the range of the inlet 11 of the blower chamber 8 is relatively weak, so that the unmelted waste plastic piece 2 is transferred from the preheating chamber 3 to the blower chamber 8. Since it does not suck in and the total suction force of the exhaust is large, it can be exhausted sufficiently and no bad odor is generated around the processing apparatus.

By changing the suction force adjusting plate 12 and changing the cross-sectional opening area of the inlet 11 of the air exhaust chamber 8, the suction force at the inlet 11 is
It can be adjusted according to the type and size of waste plastic. If the suction force adjusting plate 12 is detachable, it can be easily replaced and cleaned.

In addition, a very small piece of waste plastic, such as beads, is introduced into the
Even if the air is sucked into the exhaust chamber 8 from the above, it is returned to the preheating chamber 3 from the exhaust port 15 again.

Further, since the baffle plate 17 is provided between the waste plastic inlet 7 and the inlet 11 of the exhaust chamber 8, the waste plastic pieces 2 injected from the waste plastic inlet 7 are directly sucked into the exhaust chamber 8. Never be done.

[Effects of the Invention] As described above, in the waste plastic processing device of the present invention, the cross-sectional area of the inlet of the exhaust chamber is made larger than the cross-sectional area of the intake port of the exhaust fan. The suction force in the area of the inlet is relatively weak. Therefore, the small waste plastic pieces are not discharged together with the hot air, and the hot air can be exhausted sufficiently.

Further, since the partition plate is provided with the exhaust port, even if a very small waste plastic piece is sucked into the air exhaust chamber, this waste plastic piece is returned from the air exhaust chamber to the preheating chamber through the exhaust port.

Furthermore, since the suction force adjusting plate is provided in the range of the exhaust chamber inlet,
The suction resistance at the inlet of the air exhaust chamber can be adjusted according to the type and size of the waste plastic, which can further prevent the waste plastic pieces from being discharged.

Furthermore, between the waste plastic input port and the exhaust chamber inlet,
Since the baffle plate is provided, the waste plastic pieces injected through the waste plastic injection port are not directly sucked into the air exhaust chamber.

[Brief description of drawings]

1 is a vertical sectional view showing a waste plastic processing apparatus according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. 1a, 1b, 1c …… Outer wall part, 2 …… Waste plastic pieces, 3…
… Preheating chamber, 4… Melting furnace, 5… Vessel, 6… Hot air generator, 7… Waste plastic input port, 8… Exhaust chamber, 9…
… Exhaust fan, 10 …… partition plate, 11 …… inlet of the exhaust chamber, 12…
… Suction force adjusting plate, 13 …… Beam, 14 …… Suction port, 15 ……
Discharge port, 16 ... Baffle plate, 17 ... Baffle plate, 18 ... Hot air inlet port, 19 ... Hot air inlet port cover plate, 20 ... Hot air retention chamber, 21 ...
… Connecting pipe, 22 …… deflector, 22a …… bar, 23 …… stopper, 24 …… bottom plate of hot air retention chamber, 25 …… hot air outlet.

Claims (4)

[Scope of utility model registration request] 1. A preheating chamber for preheating a waste plastic piece fed from a waste plastic feeding port, a melting furnace arranged below the preheating chamber for melting and reducing the volume of the waste plastic piece by hot air, and the melting furnace. In a waste plastic treatment device equipped with a hot air generator that supplies hot air to the furnace and a container for receiving molten waste plastic, which is arranged below the melting furnace, an exhaust chamber is provided above the preheating chamber by a partition plate. The hot air inlet is formed at one end of this exhaust chamber, and the other end is connected to the intake port of the exhaust fan, and the cross-sectional area of the inlet of the exhaust fan is larger than the cross-sectional area of the intake port of the exhaust fan. Waste plastic processing equipment characterized by 2. The partition plate is arranged so as to be inclined so that the inlet side of the hot air is higher than the inlet side of the exhaust fan, and the exhaust port for waste plastic small pieces leading from the air exhaust chamber to the preheating chamber is the inlet port of the partition plate. It is characterized in that it is formed in the range on the side. The waste plastic processing device according to claim 1. 3. The waste plastic processing apparatus according to claim 1, wherein a suction force adjusting plate made of a perforated plate, a lattice plate, a mesh plate or the like is provided in the range of the inlet of the air exhaust chamber. 4. A baffle plate is provided between the waste plastic input port and the inlet of the air exhaust chamber.
Waste plastic processing equipment as described.