JPH0734655Y2 - 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 type has a funnel-shaped melting furnace that has a large number of hot air inlets and is reduced in size, a hot air retention chamber that surrounds the melting furnace, and hot air is supplied to the hot air retention chamber. It is provided with a hot air generator and a container arranged below the melting furnace for receiving the molten waste plastic. The waste plastic is heated and melted and reduced in volume by the hot air supplied from the hot air generator through the hot air retention chamber and the hot air inlet into the funnel-shaped melting furnace, and drops into the container.

[Problems to be solved by the device]

In the case of this conventional waste plastic processing device, the waste plastic pieces fall into the container from the melting furnace without being melted,
May be mixed in molten plastic waste. Moreover, even if the stopper attached to the open lower end of the melting furnace holds the unmelted waste plastic pieces so that they do not fall, it is not possible to completely prevent the unmelted waste plastic pieces from falling, and the stopper Since the hot air does not easily reach the unmelted waste plastic pieces held by, the unmelted waste plastic cannot be completely melted.

The present invention was made to eliminate the above-mentioned drawbacks, and its purpose is to completely melt waste plastic pieces,
It is an object of the present invention to provide a waste plastic processing device capable of preventing unmelted plastic pieces from being mixed.

[Means for Solving the Problems]

To achieve this purpose, it has a large number of hot air inlets,
A funnel-shaped melting furnace that is reduced downward, a hot air retention chamber that surrounds the melting furnace, a hot air generator that supplies hot air to the hot air retention chamber, and a molten waste plastic that is arranged below the melting furnace. A container for receiving, hot air is supplied from the hot air generator through the hot air retention chamber and the hot air inlet into the funnel-shaped melting furnace to melt and reduce the volume of the waste plastic.
The waste plastic processing apparatus according to the present invention is characterized in that a hot air outlet is formed in the bottom plate of the hot air entrapment chamber so as to surround the open lower end of the melting furnace.

[Action]

In the waste plastic treatment apparatus according to the present invention, the hot air blown from the hot air accumulation chamber through the hot air outlet is poured onto the waste plastic that is about to drop from the melting furnace and the waste plastic in the container.

〔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 slant wall of the upper outer wall portion 1a, a waste plastic input port 7 for inputting the waste plastic piece 2 roughly framed in advance to the treatment device 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 piece 2 falls in the preheating chamber 3, it is preheated by the rising hot air. The hot air that preheated the waste plastic pieces 2 further rises, and the preheating chamber 3
The air is discharged through the air exhaust chamber 8 connected to the exhaust blower 9 provided at the top of the.

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, for example, a perforated plate. It consists of a lattice plate and a mesh plate. In the illustrated example, the suction force adjusting plate 12 has an outer wall portion 1a.
Although it is mounted by being suspended from the beam 13 that is hung between the inner wall surface on the other side and the inner wall surface on the front side, it may be mounted by other methods. For example, partition plate 10 and outer wall
It may be attached directly to the inner wall surface of 1a. 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 exhaust blower 9. Therefore, even if the suction force of the exhaust blower 9 is increased, the exhaust chamber 8
Since the suction force in the range of the inlet 11 is weakened, 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 discharge port 15, a small inclined baffle plate 16 is attached to prevent the small pieces of waste plastic from being sucked into the suction port 14 of the exhaust 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 passes through the connection pipe 21, the hot air retention chamber 20 and the hot air inlet 18, and then the funnel-shaped melting furnace 4
Will be introduced in.

A deflection plate 22 is arranged in the center of the upper portion of the melting furnace 4. The deflecting plate 22 serves to deflect the hot air introduced into the melting furnace 4 and the waste plastic pieces blown up by the hot air. In the illustrated embodiment, the deflection plate 22 is formed in an umbrella shape and is suspended and fixed to the partition plate 10 by the rod 22a, but it may have another shape (for example, a flat plate), or it may be attached to the processing apparatus by another method. Good.

A hot air outlet 25 is formed in the bottom plate 24 of the hot air retention chamber 20 so as to surround the open lower end of the melting furnace 4. That is, the portion of the bottom plate 24 on the side of the melting furnace 4 is cut out and
25 are formed. The hot air is blown from the hot air retention chamber 20 through the hot air outlet 25 as shown by the arrow.

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 roughly framed in advance by 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, the hot air blown up in the melting furnace 4 hits the deflection plate 22 together with the waste plastic piece 2 and is pushed back to the surface of the melting furnace 4, so that the waste plastic piece 2 is further blown up and sucked and discharged by the exhaust blower 9. At the same time, the waste plastic pieces 2 are exposed to a large amount of hot air, and the waste plastic pieces 2 are efficiently melted. The melted waste plastic falls into the container 5.

The hot air blown from the hot air retention chamber 20 through the hot air outlet 25 is applied to the molten waste plastic that is about to fall into the container 5, and the molten waste plastic is additionally melted. Further, the unmelted waste plastic piece 2 held by the stopper 23 is melted. Since the hot air blown out from the hot air outlet 25 is further applied to the waste plastic in the container 5, when the unmelted waste plastic is mixed with the molten waste plastic in the container 5, this unmelted waste plastic is mixed. To melt.

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

[Effect of device]

As described above, in the case of the waste plastic processing apparatus of the present invention, the hot air blowing outlet is formed in the bottom plate of the hot air holding chamber so as to surround the open lower end of the melting furnace, so that the hot air blowing chamber blows hot air. The hot air blown through the outlet is applied to the waste plastic that is about to fall from the melting furnace and the waste plastic in the container. Therefore, the molten waste plastic that is about to fall into the container is additionally melted, the unmelted waste plastic piece held by the stopper is melted, and the unmelted waste plastic in the container is melted. Therefore, the waste plastic is completely melted, and it is possible to prevent the unmelted waste plastic from being mixed.

[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 blower, 10 …… Partition plate, 11 …… Inlet of 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 cover plate, 20 …… Hot air retention chamber,
21 …… Connection pipe, 22 …… Deflector, 22a …… Bar, 23 …… Stopper, 24 …… Bottom plate of hot air retention chamber, 25 …… Hot air outlet

Claims (1)

[Scope of utility model registration request] 1. A funnel-shaped melting furnace having a large number of hot-air inlets and reduced in size, a hot-air retention chamber surrounding the melting furnace, a hot-air generator for supplying hot air to the hot-air retention chamber, and melting. A container for receiving the molten waste plastic is provided below the furnace, and hot air is supplied from the hot air generator to the funnel-shaped melting furnace through the hot air retention chamber and the hot air inlet to melt the waste plastic.
In the waste plastic processing apparatus for volume reduction, the hot plastic outlet is formed in the bottom plate of the hot air retention chamber so as to surround the open lower end of the melting furnace.