JP2002370225A - Apparatus for cooling and solidifying molten plastic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for cooling and solidifying a molten plastic capable of suppressing a deposition of a foreign matter and a damage of a belt and efficiently cooling and solidifying. SOLUTION: The apparatus for cooling and solidifying the molten plastic comprises a roller 3 spaced at a predetermined interval from an upper surface of the belt 12 above the belt 12, displaceable upward from a predetermined interval and rotatable along a running direction of the belt, a non-contact range finder 7 for sensing the foreign matter before arriving at the roller 3, a support hinge 6a for displacing the roller 3 upward based on a sense signal from the finder 7, a cooling water content regulator 8 for expediting cooling of a belt site for conveying the foreign matter which displaces the roller upward and a belt speed regulator 9, and a damper 41 for sorting a recycled article 51a at the time of discharging the belt site including the matter as the article 51a based on positional information of the roller 3 from the hinge 6a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for cooling and solidifying a heat-treated molten plastic used for a waste plastic recycling treatment.

[0002]

2. Description of the Related Art For example, general waste plastics discharged from homes and the like are melted plastics obtained by removing chlorine from polyvinyl chloride contained in waste plastics by heat treatment, and then cooled and solidified, and are used as reducing agents for blast furnaces. Reused as solid fuel (Japanese Patent Laid-Open No. 11-2929)
No. 76).

Here, as one of the devices for efficiently cooling and solidifying a plastic having a low thermal conductivity, a belt cooler similar to that used in a process of manufacturing a plastic in a chemical plant is used. . The belt cooler is a device that cools and solidifies the molten plastic while placing and transporting the molten plastic on the upper surface of the rotatable belt by conduction from the belt or water spray from above the belt.

[0004] However, when the molten plastic, which is a molten product of waste plastic, is cooled and solidified by the belt cooler having the above configuration, there is a problem that the thickness of the finished product (cooled solidified product) becomes uneven. Was. For example, even if the molten material flows out onto the belt using a uniform wide nozzle, the thickness in the width direction will not be constant due to the difference in physical properties due to component deviation and the effect of surface tension, etc. Will occur. In addition, in the traveling direction of the belt, in addition to the non-uniformity of the above-described components, the pulsation flowing out of the nozzle causes non-uniform thickness.

[0005] Here, since it is difficult to cool the inside of the molten plastic in the thickened portion, there is a problem that the insufficiently cooled molten plastic adheres to the periphery and the quality of the recycled product to be reused cannot be kept constant. Was. Therefore, in order to solve such a problem, as shown in FIG.
Means for providing are known. The cooling and solidifying device 101a by this means comprises a belt cooler 1 having a wide belt 12 wound around a pair of cylindrical belt wheels 11 installed at both ends, and a spray 13 for cooling the belt 12.
A storage tank 2 provided with a nozzle 21 for discharging the molten plastic 5 on the upper surface of the belt 12, a fixed weir 30a for keeping the thickness of the molten plastic 5 constant, and a coarse crusher 4 for crushing the cooled and solidified plastic. And is composed of

According to the cooling and solidifying apparatus 101a having the above-described structure, the molten plastic 5 passes through the predetermined gap provided between the upper surface of the belt 12 and the fixed weir 30a, so that all plastics have the same thickness as this predetermined gap. It became possible to secure. As shown in FIG. 6, there is also known a double belt cooler in which another belt 30b is provided at a predetermined interval on the upper surface of the belt 12. In the cooling and solidifying apparatus 101b by this means, a wide belt 12 is wound around a pair of cylindrical belt wheels 11 installed at both ends, and a spray 13 for cooling the belt 12 is provided.
, A wide belt 30b installed on the upper surface of the belt 12 and wound around a belt wheel 11b in the same manner as the belt cooler 1, and a storage having a nozzle 21 for discharging the molten plastic 5 on the upper surface of the belt 12 A tank 2 and a crusher 4 for crushing the cooled and solidified plastic
And is composed of

According to the cooling and solidifying apparatus 101b having the above-described configuration, the molten plastic 5 passes through the predetermined interval provided between the upper and lower belts 12, 30b, so that all the plastics have the same thickness as the predetermined interval. It became possible to do.

[0008]

However, when waste plastics are mixed with metals at the time of disposal, or are entangled with pebbles at the stock yard during handling, foreign materials other than plastics are inevitably contained. There are many. In addition, even if these foreign substances melt the waste plastic, they do not always become in a molten state. For example, foreign substances such as iron, glass, and pebbles remain as hard.

For this reason, as shown in FIG.
In the means using a, if the foreign matter contained in the molten plastic 5 is larger than the interval provided between the fixed weir 30a and the belt 12, the fixed weir 30a and the belt 12
And the belt 12 is damaged. If the molten plastic 5 penetrates into the scratches caused by the damage, there is a risk that defective peeling, insufficient cooling, or leakage of the molten plastic 5 may occur. Further, foreign matter that cannot pass through the fixed weir 30a accumulates before the fixed weir 30a, and the accumulated foreign matter is cooled and solidified, which may cause an operation failure of the apparatus.

Further, another belt 30 as shown in FIG.
In the means using b, the foreign matter contained in the molten plastic 5 is removed by the lower belt 12 and the upper belt 30b.
Between the upper and lower belts 12, 30b
In the worst case, the belts 12 and 30b may be meandered or broken. Accordingly, the present invention has been made in view of the above circumstances, and provides a cooling and solidifying apparatus for molten plastic that can suppress the accumulation of foreign substances and damage to a belt cooler and efficiently perform cooling and solidification. The challenge is to do.

[0011]

In order to solve the above-mentioned problems, the invention according to claim 1 causes the molten plastic that has been subjected to the heat treatment to flow out onto the upper surface of a running belt, and is cooled and solidified while being conveyed by the belt. A cooling and solidifying apparatus for cooling molten plastic, which is provided above the belt at a predetermined distance from the upper surface of the belt and provided with a rotating member rotatable along the running direction of the belt. It is a solidification device.

[0012] The expression that the rotating member is rotatable in the running direction of the belt means that the rotating member is rotated so that the molten plastic conveyed on the belt is drawn directly below the rotating member. According to the first aspect of the present invention, a rotating member is provided above the belt at a predetermined interval from the upper surface of the belt, and is provided with a rotatable member rotatable along the running direction of the belt. Even if the molten plastic containing foreign matter is conveyed, the foreign matter can be passed through the rotating member by the running motion of the belt and the rotating member rotating along the running direction of the belt. become. Here, compression of the belt by the foreign matter is limited to a local portion directly below the rotating member, so that damage to the belt can be reduced as compared with the related art using a double belt. Also, in order to pass foreign matter without accumulating,
It is possible to suppress operation failure of the device due to solidification of foreign matter.

Here, the rotating member may be any member as long as it is rotatable along the running direction of the belt, and examples thereof include a roller and a brush. Also,
Since the predetermined interval is the thickness of the plastic that has been cooled and solidified, it is possible to obtain a plastic having a desired thickness by changing the predetermined interval. According to a second aspect of the present invention, in the cooling and solidifying apparatus for molten plastic according to the first aspect, the rotating member can be displaced upward beyond a predetermined interval.

According to the second aspect of the present invention, the rotating member can be displaced upward beyond a predetermined interval, so that when the molten plastic containing foreign matter passes through the rotating member, the rotating member is moved upward. Can be displaced. Therefore, it is possible to efficiently suppress damage to the belt due to foreign matter biting, and operation failure of the apparatus due to foreign matter accumulation.

According to a third aspect of the present invention, in the apparatus for cooling and solidifying molten plastic according to the first or second aspect, the molten plastic is installed above the belt between a position where the molten plastic flows out to the upper surface of the belt and the rotating member, Foreign matter detecting means for detecting a belt portion that conveys foreign matter before reaching the rotating member, and displacement means for displacing the rotating member above a predetermined interval, based on a detection signal from the foreign matter detecting means,
The displacement means is controlled.

According to a third aspect of the present invention, there is provided a foreign matter detecting means for detecting a belt portion which conveys foreign matter before reaching the rotating member, and a displacement means for displacing the rotating member above a predetermined interval. By controlling the displacement means based on the detection signal from the foreign matter detection means,
In order to reliably prevent foreign substances from being caught and deposited on the rotating member, it is possible to suppress damage to the belt and poor operation of the apparatus.

Here, a non-contact distance meter, a CCD camera or the like can be used as the foreign object detecting means, and a supporting hinge, an electric jack, a pneumatic cylinder or the like can be used as the displacement means. Furthermore, the invention according to claim 4 is the cooling and solidifying apparatus for molten plastic according to claim 3, wherein cooling conditions for controlling a cooling condition of a belt portion that conveys foreign substances are controlled based on positional information of a rotating member from a displacement unit. It is provided with condition control means.

According to a fourth aspect of the present invention, there is provided a cooling condition control means for controlling a cooling condition of a belt portion for conveying foreign matter based on positional information of the rotating member from the displacement means. The condition can be changed to a condition that promotes cooling of a belt portion that conveys a molten plastic having an uneven thickness. Therefore, it is possible to eliminate the insufficient cooling of the molten plastic having the non-uniform thickness and the non-uniform thickness.

Here, examples of the cooling condition control means include a cooling water temperature adjusting device, a cooling water amount adjusting device, and a belt speed adjusting device. Furthermore, the invention according to claim 5 is a cooling and solidifying apparatus for molten plastic according to claim 3 or 4, wherein the molten plastic solidified by cooling is provided at an end of the belt in the direction opposite to the outflow position of the molten plastic in the running direction of the belt. And a separation unit for separating foreign matter based on positional information of the rotating member from the displacement unit.

According to the fifth aspect of the present invention, there is provided a crusher for crushing the cooled and solidified molten plastic, and based on the positional information of the rotating member from the displacement means, foreign substances are contained in the crushed material by the crusher. By providing the separation means for separating the pulverized material to be pulverized, it is possible to remove the pulverized material having a non-uniform thickness including foreign matter. Therefore, it is possible to obtain a regenerated product having a uniform thickness without containing foreign matter, and thus it is possible to maintain the quality of the regenerated product to be reused more constantly.

Here, as a separating means, for example, a movable plate (damper) which can be moved in the left and right directions about an axis, etc.
There is a device for switching the discharge destination of the pulverized material.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment according to the present invention.
It is a side view which shows the cooling-solidification apparatus of the molten plastic in embodiment. The molten plastic cooling and solidifying device 100a according to the first embodiment includes a belt cooler 1 containing a spray 13 as a cooling device for cooling a belt 12, and a storage tank 2 for accumulating molten plastic 5.
And a coarse crusher 4 for crushing the cooled and solidified plastic
And a roller 3 as a rotating member for adjusting the thickness of the conveyed molten plastic.

The belt cooler 1 has a wide belt 12 wound around a cylindrical belt wheel 11 installed at both ends.
As the belt 12 rotates with the rotation of the belt wheel 11, the molten plastic 5 placed on the belt 12
Is transported, and during the transport, the molten plastic is cooled and solidified by a cooling device such as a spray 13 sprayed from the lower surface side of the belt 12.

The storage tank 2 is installed at the end of the upper surface of the belt 12 on the upstream side (the left side in FIG. 1) in the belt running direction (the direction toward the right in FIG. 1), and the inside thereof is dechlorinated. Molten plastic 5 is accumulated. The molten plastic 5 is supplied from the nozzle 21 located at the bottom of the storage tank 2 to the belt 12 of the belt cooler 1.
It is discharged to the upper surface at regular intervals.

The coarse crusher 4 is installed at the end of the upper surface of the belt 12 on the downstream side (the right side in FIG. 1) in the belt traveling direction (the direction toward the right in FIG. 1). Then, the cooled and solidified plastic is crushed. The roller 3 has a cylindrical shape, and is rotated above the belt between the storage tank 2 and the coarse crusher 4 at a predetermined interval from the upper surface of the belt so that the central axis thereof crosses the running direction of the belt. Supported as possible.
Around the roller 3, a scraper 31 made of a box-shaped plow is installed.
Is prevented from winding around the rotating member 3.

Next, a recycled product 51 of waste plastic using the molten plastic cooling / solidifying apparatus 100a having the above-described configuration.
The step of manufacturing the will be described. First, the waste plastic is heated at about 300 ° C. to perform a dechlorination treatment from polyvinyl chloride or the like to form a molten plastic 5. Here, by removing the chlorine content from the waste plastic, damage to the blast furnace and generation of harmful gases such as dioxin are suppressed.

Next, the molten plastic 5 formed in the above step is discharged from the nozzle 21 of the storage tank 2 onto the upper surface of the belt 12 of the belt cooler 1 at regular intervals. Then
The molten plastic 5 moves in the traveling direction of the belt cooler 1 while being placed on the traveling belt 12. At this time, cold water is sprayed on the lower surface side of the belt 12 from the water spray
As the vehicle 2 travels, the molten plastic 5 is cooled and solidified.

Here, the molten plastic 5 conveyed in the traveling direction of the belt 12 is conveyed through a predetermined interval provided between the roller 3 and the upper surface of the belt 12.
At this time, the roller 3 rotates along the running direction of the belt 12 (rightward in FIG. 1) with the running motion of the belt 12 that conveys the molten plastic 5 (FIG. 1).
Counterclockwise). Therefore, even if the molten plastic 5 containing foreign matter (not shown) having a size that cannot pass through the predetermined interval is conveyed, the running motion of the belt 12 and the rotating motion of the roller 3 cause the roller 3 to move.
Of the belt 12 so as to pass therethrough.

Next, the belt 12
The plastic that has been cooled and solidified while moving to the downstream side of the upper surface is pulverized by the coarse pulverizer 4 to become a regenerated product 51 such as a reducing agent for a blast furnace or a solid fuel. In the molten plastic cooling and solidifying apparatus 100a having the above configuration, the roller 3 is disposed above the belt cooler 1 at a predetermined interval from the upper surface of the belt 12, and the molten plastic 5 passes through the predetermined interval. As in the conventional cooling devices 101a and 101b provided with the fixed weir 30a and another belt 30b in FIGS. 5 and 6, a recycled product 51 of waste plastic having a constant thickness can be manufactured.

Further, even if the foreign matter is larger than a predetermined interval formed between the belt 12 and the upper surface, the foreign matter can be conveyed by the rotating motion of the roller 3 accompanying the running motion of the belt 12. Here, the pressure applied to the belt 12 when the foreign matter passes through the roller 3 is limited to a local portion immediately below the roller 3, so that damage to the belt 12 can be suppressed.

Further, by the rotational movement of the roller 3,
Since the accumulation of foreign matter can be suppressed, it is possible to suppress the operation failure of the apparatus due to solidification of the accumulated foreign matter. Here, the scraper 3 is used to prevent the molten plastic 5 from being wound around the roller 3 in the first embodiment.
Although 1 is used, the invention is not limited to this. For example, the inside or the surface of the roller 3 may be actively cooled by water cooling or the like to promote peeling. Conversely, heating may prevent the molten plastic 5 from being wound around the roller 3.

Next, an apparatus 100b for cooling and solidifying a molten plastic according to a second embodiment is shown in FIG. FIG. 2 is a side view showing an apparatus for cooling and solidifying molten plastic in a second embodiment according to the present invention. Apparatus 100b for cooling and solidifying molten plastic in second embodiment
Are the rollers 3 in the first cooling and solidifying apparatus 100a.
Are supported on the upper surface of the belt 12 at a predetermined interval by the support hinge 6a.

The support hinge 6a includes a pair of support members 62a which can swing about a central axis 61a.
The pair of support members 62a rotatably support both ends of the center axis of the roller 3 respectively. Further, by changing the rotation angle of the center axis 61a in the support hinge 6a,
By swinging the pair of support members 62a, the roller 3
In the vertical direction.

Using the molten plastic cooling device 100b in the second embodiment, a recycled product 5 of waste plastic is used.
In order to manufacture the belt 1, the molten plastic 5 is caused to flow out onto the upper surface of the belt 12 of the belt cooler 1 after performing the same steps as those in the first embodiment. Here, if the molten plastic 5 conveyed in the running direction of the belt 12 contains foreign matter, the roller 3 supported by the support hinge 6a is pushed upward by the protrusion of the foreign matter and moves upward. Then, after the molten plastic 5 containing foreign matter has passed, the roller 3 descends and is again supported at the original predetermined interval.

Next, a recycled product 51 of waste plastic can be manufactured through the same steps as in the first embodiment. In the molten plastic cooling and solidifying apparatus 100b having the above-described configuration, the roller 3 can be displaced upward, so that when the foreign matter is conveyed, the roller 3 can be displaced upward by the pressing force of the foreign matter. It becomes possible.
Therefore, it is possible to prevent the foreign substances from being caught in the rollers 3 and to prevent the foreign substances from being accumulated, thereby further suppressing the damage to the belt 12 and suppressing the operation failure of the apparatus due to the solidification of the deposited foreign substances.

Here, in the second embodiment, a support hinge 6 is used as a mechanism for vertically supporting the roller 3.
Although a was used, when the foreign matter passes through the roller 3, the roller 3 is displaced upward by the pressing force of the foreign matter, and after the foreign matter passes through the roller 3, the original predetermined interval is maintained again. If it does, it is not limited to this. For example, a pneumatic cylinder or a hydraulic cylinder may be used.

Next, FIG. 3 shows an apparatus 100c for cooling and solidifying a molten plastic according to a third embodiment. FIG.
FIG. 6 is a side view showing a cooling and solidifying apparatus for molten plastic according to a third embodiment of the present invention. The cooling device 100c for molten plastic according to the third embodiment is the same as the cooling device 100b described in the second embodiment, except that a non-contact distance meter is provided above the belt 12 between the storage tank 2 and the roller 3 as foreign matter detection means. 7 is provided. Although the roller 3 is supported at a predetermined position by the support hinge 6a used in the second embodiment, in the third embodiment, the support hinge 6a has its center axis 6
A motor 6b for controlling the rotation angle of 1a is provided. With this motor 6b, the support hinge 6a functions as a displacement unit that controls the displacement of the roller 3 in the vertical direction by the controller 1A based on the detection signal from the non-contact distance meter 7.

The non-contact distance meter 7 is a device for measuring the distance from the surface of the molten plastic 5 on the upper surface of the belt 12 to the non-contact distance meter 7. It is detected as a belt part containing foreign matter. In order to manufacture a recycled product 51 of waste plastic using the molten plastic cooling device 100c according to the third embodiment, the belt 12 of the belt cooler 1 is subjected to the same process as in the first embodiment.
The molten plastic 5 flows out to the upper surface.

Here, the molten plastic 5 that has flowed out onto the upper surface of the belt 12 is transferred to the belt 12 in the same manner as in the first embodiment.
The foreign object is detected by the non-contact distance meter 7 before being transported in the traveling direction of the roller 3 and reaching the roller 3. When the non-contact distance meter 7 detects the belt portion that conveys foreign matter, the detection signal is transmitted to the controller 1A, and the time at which the belt portion starts passing through the roller 3 is determined based on the belt speed at that time. The time to complete is calculated. And controller 1
By A, the roller 3 is displaced upward at the time when the belt portion starts to pass through the roller 3, and the roller 3 again has a predetermined interval with the upper surface of the belt 12 at the time when the belt portion completes passing the roller 3. By operating the motor 6b so as to be displaced to the position, the rotation angle of the center shaft 61a in the support hinge 6a is controlled.

Next, through the same steps as in the first embodiment, a recycled product 51 similar to that in the first embodiment can be manufactured.
In the molten plastic cooling device 100c according to the third embodiment, the non-contact distance meter 7 and the support hinge 6a controlled by the motor 6b are provided, so that damage to the belt 12 due to foreign matter can be further reduced. Further, it is possible to prevent foreign matters from being deposited on the roller 3 beforehand.

In the third embodiment, the non-contact distance meter 7 is used as the foreign substance detecting means. However, the present invention is not limited to this as long as it has a function of detecting foreign substances. , A horizontal transmission photoelectric switch, or the like. Further, the displacement means is the support hinge 6a controlled by the motor 6b.
The control method is not limited to this as long as it can be controlled based on the detection signal from the foreign object detection means. For example, a pneumatic cylinder, a hydraulic cylinder, or an electric jack may be used.

Next, FIG. 4 shows an apparatus 100d for cooling and solidifying a molten plastic according to a fourth embodiment. FIG.
It is a side view which shows the cooling-solidification apparatus of the molten plastic in 4th Embodiment concerning this invention. The molten plastic cooling and solidifying apparatus 100d according to the fourth embodiment is similar to the molten plastic cooling and solidifying apparatus 100c according to the third embodiment described above, except that the molten plastic is cooled and crushed by the coarse crusher 4 to control cooling conditions. The apparatus includes a separation unit that separates a recycled product 51a containing foreign matter from a recycled product 51b containing no foreign matter among the recycled goods 51 to be manufactured.

The cooling condition control means includes a cooling water amount adjusting device 8 and a belt speed adjusting device 9 so that the cooling condition can be changed as needed according to the thickness of the molten plastic 5 conveyed by the belt 12. . That is, the cooling water amount adjusting device 8 is controlled by the controller 2A based on the position information of the roller 3 from the support hinge 6a, and the belt speed adjusting device 9 is controlled based on the position information of the roller 3 from the support hinge 6a. It is controlled by the controller 3A.

As a separating means, there is provided a movable plate (damper) which can move in the left-right direction about the axis. The damper 41 is a device that is installed in a container 4 a that stores the regenerated product 51 crushed by the coarse crusher 4, moves left and right about an axis, and separates the discharge destination of the regenerated product 51. The damper 41 can be moved in the left-right direction by the sorting adjustment device (cylinder) 10 controlled by the controller 4A based on the position information of the roller 3 from the support hinge 6a.

In order to manufacture a recycle product 51 of waste plastic using the molten plastic 100d in the fourth embodiment, the molten plastic 5 is passed through the roller 3 in the same process as in the second embodiment. Here, in the fourth embodiment, when the support angle of the support hinge 6 a changes due to the upward displacement of the roller 3, the controller 1 </ b> A changes the belt speed by displacing the roller 3 upward from the belt speed at that time. The time when the part passes right above the spray 13b is determined, and the time and the position information of the roller 3 are transmitted to the controller 2A. Then, the controller 2A controls the cooling water amount adjusting device 8 so as to increase the cooling water amount when the belt portion passes right above the spray 13b. At this time, if the increase amount of the cooling water amount is changed according to the displacement amount of the roller 3 calculated from the support angle of the support hinge 6a, the cooling and solidification can be performed more reliably.

Next, when the molten plastic 5 conveyed while being cooled and solidified as in the above-described process is conveyed downstream in the running direction of the belt 12, the cooled and solidified plastic is pulverized by the coarse pulverizer 4. Is accommodated in the container 4a. Here, when the roller 3 is displaced upward by the support hinge 6a which is a displacement means, the controller 1A calculates the time when the belt portion at that time is pulverized by the pulverizer 4, and the controller 4A To communicate. The controller 4A operates the separation adjusting device 10 so that when the time for crushing the belt portion containing foreign matter comes, the damper 41 moves to a position where the belt portion containing foreign matter is discharged to another discharge destination. In addition, the recycled product containing the foreign matter is separated and accommodated.

In the apparatus 100d for cooling and solidifying molten plastic having the above-described structure, the condition for promoting cooling of the belt portion where the roller 3 is displaced upward is set as follows.
The molten plastic 5 containing foreign matter and having a thickness can be reliably cooled. Therefore, it is possible to prevent the under-cooled molten plastic 5 from adhering to the surroundings.

Further, by installing a damper 41 for separating a recycled product 51a containing foreign matter and a recycled product 51b containing no foreign matter in the container 4a to which the crushed material of the coarse crusher 4 is discharged, the foreign matter is removed. It is possible to provide the remanufactured product 51 having a certain quality without being included. Here, in the fourth embodiment, the cooling device controlled by the cooling water amount adjusting device 8 is the spray 13b. However, if the cooling device is at least on the downstream side of the roller 3, for example, the spray 1b is used.
Any one such as 3a and 13c may be controlled.

Further, in the fourth embodiment, the cooling control means is controlled so that the belt portion where the roller 3 has been displaced upwards has a condition for promoting the cooling when the belt portion passes just above the spray 13b. , Not limited to this, roller 3
Is displaced upward, for example, the cooling water amount adjusting device 8
May be used to increase the amount of cooling water. Similarly, the belt speed may be reduced by the belt speed adjusting device 9. At this time, when the roller 3 is displaced upward, the controller 1A switches to the controller 3A.
The position information of the roller 3 is transmitted to the control unit, and based on the information, the belt speed adjusting device (motor) 9 is controlled so that the belt speed is reduced.

Further, although the cooling control means in the fourth embodiment is the cooling water amount adjusting device 8 and the belt speed adjusting device 9, it is not limited thereto, and a cooling water temperature adjusting device or the like may be provided. Furthermore, although the separating means in the fourth embodiment is the damper 41, the recycled product 51a containing foreign matter is used.
The present invention is not limited to this as long as it can be separated from the recycled product 51b containing no foreign matter.

In the first to fourth embodiments, the central axis of the roller 3 is rotatably supported, and the belt 12 is rotated by the running motion of the belt 12 and the accompanying transport of the molten plastic 5. The present invention is not limited to this, and the roller 3 may be positively rotated using an electric motor or the like. Although the roller 3 is used as the rotating member, the invention is not limited to this, and a brush or the like can be used.

Further, the belt cooler may be any type such as a steel belt, a wire mesh belt, and a resin belt. As the cooling method, indirect water cooling by spraying through a belt was used, but natural cooling, air cooling, direct water cooling from the top of the belt, or the latent heat is used when the material to be cooled contains a volatile component. The present invention can be applied to any one of them.

Further, although the coarse crusher 4 is used as the crusher, the present invention is not limited to this and can be applied to any type of crusher such as a fine crusher. Further, the storage tank 2 may be a plastic heat treatment tank. The apparatus 100 for cooling and solidifying the molten plastic according to the present invention is effectively applied to general waste plastics discharged from ordinary households and mixed with various foreign substances, but is not limited to this. The present invention can also be applied to a case where impurities are mixed in a plastic production and handling process.

[0054]

As described above, according to the apparatus for cooling and solidifying molten plastic according to the first aspect of the present invention, there is provided a rotating member rotatable along the running direction of the belt at a predetermined distance from the upper surface of the belt. As a result, it is possible to suppress damage to the belt due to foreign matter and to suppress operation failure of the apparatus due to accumulation of foreign matter.

According to the apparatus for cooling and solidifying molten plastic according to the second aspect, the rotating member can be displaced above a predetermined interval on the upper surface of the belt, so that damage to the belt due to foreign matter and malfunction of the apparatus can be achieved. Can be suppressed more reliably. According to the apparatus for cooling and solidifying molten plastic according to the third aspect, there is provided a foreign matter detecting means for detecting foreign matter in advance, and a displacement means for displacing the rotating member upward based on a detection signal from the foreign matter detecting means. Accordingly, it is possible to efficiently suppress damage to the belt due to foreign matter and operation failure of the apparatus.

According to the apparatus for cooling and solidifying a molten plastic according to the fourth aspect of the present invention, since the cooling condition control means for controlling the cooling condition of the molten plastic containing the foreign substance is provided, the apparatus contains the foreign substance and has an uneven thickness. It is possible to eliminate insufficient cooling of the molten plastic having the above. According to the apparatus for cooling and solidifying molten plastic according to claim 5,
The provision of the separation means for separating the molten plastic containing foreign matter makes it possible to keep the quality of the recycled product to be reused constant.

[Brief description of the drawings]

FIG. 1 is a side view showing an apparatus for cooling and solidifying molten plastic in a first embodiment according to the present invention.

FIG. 2 is a side view showing an apparatus for cooling and solidifying molten plastic in a second embodiment according to the present invention.

FIG. 3 is a side view showing an apparatus for cooling and solidifying molten plastic in a third embodiment according to the present invention.

FIG. 4 is a side view showing an apparatus for cooling and solidifying molten plastic in a fourth embodiment according to the present invention.

FIG. 5 is a side view showing a conventional apparatus for cooling and solidifying molten plastic.

FIG. 6 is a side view showing a conventional apparatus for cooling and solidifying molten plastic.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Belt cooler 2 Storage tank 3 Roller (rotating member) 4 Coarse crusher 4a Container 5 Molten plastic 6a Support hinge (displacement means) 6b Motor 7 Non-contact distance meter (foreign matter detection means) 8 Cooling water amount adjustment device (cooling condition control means) 9) Belt speed adjusting device (cooling condition control means) 10 Separation adjusting device 11, 11b Belt wheel 12 Belt 13, 13a, 13b, 13c Spray 21 Nozzle 30a Fixed dam 30b Belt 31 Scraper 41 Damper (separating means) 51, 51a, 51b Refurbished product 61a Central shaft 61b Support member 100a, 100b, 100c, 100d Cooling and solidifying device 101a, 101b Cooling and solidifying device 1A, 2A, 3A, 4A Controller

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Makoto Samurato 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Prefecture Inside the Chiba Works of Steel Corporation (72) Inventor Masahiko Kajioka 1-kawasaki-cho, Chuo-ku, Chiba-shi, Chiba 4F301 AA17 BF12 BF15 BF40 BG23 BG53 BG57

Claims (5)

[Claims] 1. An apparatus for cooling and solidifying a molten plastic, in which a heat-treated molten plastic is discharged onto an upper surface of a running belt and cooled and solidified while being conveyed by the belt, a predetermined distance above the belt and an upper surface of the belt. And a rotating member that is rotatable along the running direction of the belt. 2. The apparatus for cooling and solidifying molten plastic according to claim 1, wherein the rotating member is displaceable upward from the predetermined interval. 3. A foreign matter detection device which is installed above the belt between a position where the molten plastic flows out to the upper surface of the belt and the rotating member, and detects a belt portion which conveys foreign matter before reaching the rotating member. 3. The apparatus according to claim 1, further comprising: a displacement unit configured to displace the rotating member above the predetermined interval, wherein the displacement unit is controlled based on a detection signal from the foreign object detection unit. Equipment for cooling and solidifying molten plastic. 4. The apparatus according to claim 3, further comprising cooling condition control means for controlling cooling conditions of a belt portion for transporting the foreign matter based on positional information of the rotating member from the displacement means. Equipment for cooling and solidifying molten plastic. 5. A crusher for crushing the cooled and solidified molten plastic is provided at an end of the belt in a direction opposite to a position where the molten plastic flows out in a running direction of the belt, and a crusher for rotating the rotating member from the displacement means is provided. The apparatus for cooling and solidifying a molten plastic according to claim 3, further comprising a classification unit configured to classify the foreign matter based on position information.