JPH0686059B2 - Volume reduction device for waste synthetic resin - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to an apparatus for reducing the waste synthetic resin so that it can be effectively reused.

[Prior art]

Currently, a huge amount of used synthetic resin is generated. Moreover, its amount has increased significantly. Most of the used synthetic resins are incinerated for disposal. The waste synthetic resin incinerator has a short life, and the incineration cost is rising. Further, depending on the type of synthetic resin, toxic gas is generated during incineration. Some of the used synthetic resin is used to mold recycled products. In order to reuse the waste synthetic resin, the dirty synthetic resin is washed, melted, molded into pellets, and reused. This method has a drawback that the processing cost for processing the waste synthetic resin into pellets becomes high. In order to effectively reuse a huge amount of waste synthetic resin, it is important to reduce the processing cost and reduce the solution. The reduced synthetic resin waste can be remolded with a molding machine. An apparatus has been developed that pushes waste synthetic resin into a cylinder with a thin tip to reduce the melting (Japanese Patent Laid-Open No. 61-82879). This melting device heats the tip of the cylinder in order to melt the extruded waste synthetic resin with heat. In this melting reducer, a waste synthetic resin is pushed into the cylinder by a piston, heated and melted at the tip, and pushed out from the cylinder in a reduced melting state. The melting device of this structure requires a large amount of thermal energy to heat the cylinder to a high temperature. Therefore, the running cost becomes high. A device for melting synthetic resin by self-heating has been developed as a solution reducing device for solving this drawback (Japanese Utility Model Publication No. 62-22340). This device has a screw shaft in a cylinder that pushes out waste synthetic resin. The opening at the tip of the cylinder is narrowed down, and the synthetic resin is made to generate heat by friction heat in this part. The tip of the screw shaft is shaped so that the transfer amount of the synthetic resin is small so that the heat generation amount of the synthetic resin increases at the tip of the cylinder. The melt reducing device having this structure can reduce the heat energy for heating the cylinder. However, it is difficult to efficiently reduce all thermoplastic waste synthetic resins. The reason is that the calorific value fluctuates significantly depending on the type of synthetic resin and the water content. Furthermore, the solution reducing device of this structure may explode if a synthetic resin having a high water content is used. The explosion is caused by the fact that the water contained in the waste synthetic resin vaporizes and expands temporarily in the reduced-solubility cylinder part. When the synthetic resin explodes in the cylinder, the semi-molten synthetic resin is pushed back in the cylinder and flows back into the charging port, and it is injected with water vapor and becomes extremely dangerous, causing personal injury. It is the actual situation. Therefore, there is also a drawback that the waste synthetic resin having a high water content cannot be safely reduced. The present inventor has developed a solution reducing device shown in FIG. 5 for the purpose of solving this drawback (Japanese Patent Application No. 1-199917). The melting apparatus includes a cylinder 1, a drive shaft 2 rotatably arranged in the cylinder, a friction rotor 6 rotated by the drive shaft 2, and a motor 4 rotating the drive shaft 2. . The cylinder 1 has a heat generation reducing melting opening 7, and a friction rotor 6 is arranged in the heat generation reducing melting opening 7.
A predetermined friction heating gap is provided between the friction rotor 6 and the friction rotor 6. This reducing agent reduces the waste synthetic resin under the following conditions. The waste synthetic resin is supplied to the cylinder 1. The synthetic resin sent into the cylinder 1 is sent forward by the screw shaft 5. The waste synthetic resin pumped in the cylinder 1 is rubbed in the friction heating gap between the heat generation reducing melting opening 7 and the friction rotor 6 to generate heat by itself. The reason why the waste synthetic resin self-heats in the friction heating gap is that the waste synthetic resin is pumped while being rubbed while being pressed against the inner surface of the heat generation reducing melting opening 7 by the rotating friction rotor 6. The heat generation amount of the waste synthetic resin can be adjusted by the distance of the friction heating gap between the inner surface of the heat generation reducing melting opening 7 and the outer surface of the friction rotor 6. When the friction heating gap is narrowed, the waste synthetic resin is strongly pressed and the amount of heat generated increases. On the contrary, if this friction heating gap is adjusted to be wide, the pressing frictional force of the waste synthetic resin is reduced and the amount of heat generation is reduced. The waste synthetic resin reduced in the cylinder 1 is extruded from between the heat generation reduction melting opening 7 and the friction rotor 6. The device for reducing the waste synthetic resin in this manner has a feature that the synthetic resin can be efficiently reduced. However, the synthetic resin extruded from the friction rotor 6 and the heat generation reducing melting opening 7 has a drawback that it is difficult to peel off because it is welded to the surface of the friction rotor 6. This is because the friction rotor 6 is overheated, the molten waste synthetic resin is welded, and this gradually grows. The phenomenon that the synthetic resin adheres to the surface of the friction rotor can be eliminated by cooling the friction rotor to a predetermined temperature. By the way, a device for cooling a friction rotor rotating inside a cylinder has been developed (Japanese Patent Laid-Open No. 49-68562). This publication describes an apparatus for treating synthetic resin waste in which a friction rotor is arranged at the tip of a cylinder and a cooling chamber is provided inside the friction rotor. In this device, a friction rotor is fixed to the tip of a screw shaft, and a cooling pipe for supplying a cooling liquid to a cooling chamber of the friction rotor is provided inside the screw shaft.
Cooling liquid is supplied from a cooling pipe penetrating the screw shaft to the cooling chamber of the friction rotor to cool the friction rotor.

[Problems to be Solved by the Invention]

In the waste synthetic resin reducing apparatus described in this publication, a friction rotor is arranged at a fixed position of a cylinder by a screw shaft. In order to arrange the screw shaft at a fixed position, the outer circumference of the fins fixed to the screw shaft is brought close to or slid on the inner surface of the cylinder. It is difficult to arrange the friction rotor at an accurate position in the melt reducing device having this structure. This is because if the fins of the screw shaft and the sliding portion between the inner surface of the cylinder wear and the clearance increases, the screw shaft cannot be accurately supported at the center of the cylinder. The friction heating gap provided between the heat generation reducing opening of the cylinder and the friction rotor is considerably narrow because frictional heat is generated by rubbing the waste synthetic resin here, so it is very difficult to set this gap as a fixed gap. Is important to The fluctuation of the friction heating gap causes the frictional heat of the supplied synthetic resin to fluctuate significantly. If the friction heating gap is widened even a little, the friction heat of the synthetic resin is remarkably reduced and it becomes impossible to sufficiently reduce the melting. On the other hand, if it gets narrower, the frictional heat will increase rapidly and the synthetic resin will be overheated. In order to prevent this adverse effect, the inventor of the present invention has developed a device for reducing melting in which the friction rotor is supported by a rotating shaft instead of being supported by the screw shaft. This device projects a synthetic resin from a friction rotor and projects it forward to fix a rotary shaft, and the rotary shaft is supported by bearings to dispose the friction rotor at a predetermined position in a cylinder. In this melting reducing apparatus, the friction rotor can be arranged at an accurate position of the heat generation reducing melting opening via the rotary shaft and the bearing. However, in the structure reducing apparatus of this structure, the rotating shaft is fixed in front of the synthetic resin heated by friction and pushed out.
The frictional heat of the friction rotor heats the rotating shaft, which has the drawback of significantly shortening the life of the bearing that supports the rotating shaft.
In order to prevent overheating of the bearing, it is advisable to lengthen the rotary shaft and move the bearing far away from the friction rotor. However, in order to lengthen the rotating shaft to prevent overheating of the bearing, it is necessary to lengthen the rotating shaft considerably. However, when the friction rotor at the tip is supported by the long rotating shaft, a large bending moment acts on the bearing, and it becomes difficult to dispose the friction rotor at the exact position of the heat generation reducing opening. If the rotary shaft bends or if the angle at which the bearing supports the rotary shaft deviates even a little, the centers of the friction rotor and the cylinder deviate, and it becomes impossible to form a uniform friction heating gap in the heat generation reducing melting opening. To accurately align the center of the friction rotor with the cylinder, it is important to shorten the rotating shaft. Further, the long rotating shaft needs to be thick, but the thick rotating shaft has a harmful effect of conducting a large amount of heat from the friction rotor and promoting overheating of the bearing. Therefore, the structure in which the rotating shaft is projected in front of the friction rotor and supported by the bearing has a drawback that maintenance is extremely troublesome. The present invention was further developed with the object of solving this drawback, and an important object of the present invention is to enable the synthetic resin extruded with reduced solubility to be smoothly separated and discharged,
It is an object of the present invention to provide a device for reducing waste synthetic resin, which simplifies maintenance and allows a friction rotor to be placed at an accurate position in a cylinder.

[Means for Solving Conventional Problems]

The waste synthetic resin reducing apparatus of the present invention has the following configuration in order to achieve the above-mentioned object. The reducing agent is equipped with a cylinder 1 and a friction rotor 6 for reducing the waste synthetic resin. The friction rotor 6 is disposed in the heat reducing melting opening 7 of the cylinder 1, and the waste synthetic resin supplied is rubbed between the outer periphery of the friction rotor 6 and the inner surface of the heat reducing melting opening 7 to reduce the heat. A friction heating gap having a predetermined interval is formed. Further, in the melting reducing apparatus of the present invention, a cooling chamber 6A for forced cooling is provided inside the friction rotor 6. Further, the friction rotor 6 is provided with a rotating shaft 6D that projects forward to push out the reduced-melting synthetic resin. The rotating shaft is a bearing
It is rotatably supported via 3A, and the rotating shaft 6D and bearing
The friction rotor 6 is rotatably supported via 3A. Further, the apparatus for reducing the amount of waste synthetic resin according to the present invention vertically penetrates the rotary shaft 6D of the friction rotor 6 and communicates with the cooling chamber 6A of the friction rotor 6 and has a built-in cooling pipe.
The cooling liquid supplied to the cooling chamber 6A via the cooling pipe cools the friction rotor 6 and is also used for cooling the rotating shaft 6D of the friction rotor 6 and the bearing 3A supporting the rotating shaft 6D. That is, the apparatus for reducing waste synthetic resin of the present invention has a unique structure for cooling both the rotating shaft and the bearing of the friction rotor with the cooling liquid for cooling the friction rotor.

[Action]

The solution reducing device of the present invention reduces the waste synthetic resin in the following state and discharges it. The waste synthetic resin supplied to the cylinder is rubbed in the friction heating gap between the heat generation reducing melting opening 7 and the friction rotor 6, heated and melted, and then extruded from the cylinder. The waste synthetic resin self-heats in this portion because the waste synthetic resin is pressure-fed by the rotating friction rotor 6 while being pressed against the inner surface of the heat-reducing melting opening 7, while being pumped. However, the reducing apparatus of the present invention does not necessarily completely melt the waste synthetic resin between the cylinder 1 and the friction rotor 6. This is because even if the waste synthetic resin is in a semi-molten state or in a partially molten state, it is possible to sufficiently reduce the solubility. The synthetic resin extruded from the cylinder is extruded without being welded to the surface of the friction rotor 6. This is because the friction rotor 6 is forcibly cooled by the cooling water flowing inside. First, when the inventor forcedly cools the friction rotor 6,
It was considered that the exothermic temperature of the waste synthetic resin decreased and it could not be sufficiently dissolved in the cylinder. Therefore, a mechanism has been developed to remove the synthetic resin deposited on the surface of the friction rotor 6 with a scraping blade. However, according to this structure, there is a drawback that it is difficult to make the scraping blades follow the surface of the friction rotor 6 having the convex stripes. Therefore, the present inventor made a prototype of a solution-reducing device for forcibly cooling the friction rotor, and observed the solution-reduced state of the synthetic resin in detail.
As a result, surprisingly, despite the forced cooling of the friction rotor, the waste synthetic resin was sufficiently heated and melted and succeeded in reducing the solution. This is because the waste synthetic resin is heated and melted by frictional heat, and the heat generated by the friction of the synthetic resin itself is larger than the friction between the waste synthetic resin and the friction rotor. The forcibly cooled friction rotor allows the waste synthetic resin to generate sufficient heat, but the surface temperature of itself can be set low, so that the molten synthetic resin is not welded to the surface. Therefore, the melt reducing apparatus of the present invention realizes a feature that the synthetic resin melted in the cylinder can be discharged extremely smoothly. Further, the melting reducing apparatus of the present invention projects forward from the friction rotor to fix the rotating shaft, and the rotating shaft is supported by bearings to dispose the friction rotor at a fixed position of the heat reducing melting opening of the cylinder. A cooling pipe is provided so as to penetrate the rotary shaft, and the cooling pipe is communicated with the cooling chamber of the friction rotor. In the melt reducing device having this structure, the cooling liquid flowing into the cooling chamber of the friction rotor passes through the cooling pipe of the rotating shaft. The cooling liquid cools the rotating shaft as it passes through the cooling pipe, and the rotating shaft cools the bearing.
The melt reducing device, in which the rotating shaft and the bearing are forcibly cooled, effectively prevents the bearing from overheating and significantly extends the life of the bearing. In particular, the device of the present invention
Since the cooling mechanism of the friction rotor is also used for cooling the rotary shaft, it has an extremely simple structure and can effectively cool the friction rotor, the rotary shaft, and the bearing.

【Example】

Embodiments of the present invention will be described below with reference to the drawings. However, the examples described below exemplify a reducing agent for embodying the technical idea of the present invention, and the reducing apparatus of the present invention is configured with the material, shape, structure, and arrangement of components. It is not specific to the structure below. Various modifications may be made to the solution-reducing device of the present invention within the scope of the claims. Further, in this specification, for easy understanding of the claims, the numbers corresponding to the members shown in the embodiments are referred to as "Claims of claims" and "Means for solving the conventional problems. It is added to the members shown in "Column" and "Column of action and effect". However, the members shown in the claims are not limited to the members of the embodiment. 1 is a schematic sectional view and FIG. 2 is a perspective view showing a waste synthetic resin reducing apparatus, which includes a cylinder 1, a drive shaft 2 rotatably disposed in the cylinder 1, and a drive shaft 2. Friction rotor 6 connected to the tip, and cooling water supply means C for forcibly cooling friction rotor 6
And a motor 4 for rotating the drive shaft 2. The cylinder 1 includes a reduced-melting cylinder portion 1A that heats and reduces the melting of the waste synthetic resin, and a pushing cylinder portion 1B that press-fits the waste synthetic resin into the reduced-melting cylinder portion 1A. The pushing cylinder portion 1B is connected to the tip of the reduced melting cylinder portion 1A, and the pushing cylinder portion 1B and the reduced melting cylinder portion 1A are connected in series. The reduced-solubility cylinder portion 1A reduces the amount of waste synthetic resin and discharges it from the cylinder 1. The reduced melting cylinder portion 1A is provided with a tapered heat generation reducing opening 7 whose cross-sectional area increases toward the opening end so that the heat generation state can be adjusted depending on the type of waste synthetic resin and the amount of water. The exothermic melting reduction opening 7 extends in the axial direction to form a groove (not shown).
Is provided. The provision of the groove prevents the waste synthetic resin from slipping and reduces the rotation of the synthetic resin by the screw shaft 5. The waste synthetic resin that does not rotate integrally with the screw shaft 5 at the heat generation reducing melting opening 7 is rotated by the rotating screw shaft 5.
Is efficiently self-heating. A friction rotor 6 is built in the reduced melting cylinder portion 1A. The friction rotor 6 is connected to the tip of the drive shaft 2. The friction rotor 6 is connected to the tip of the drive shaft 2 so as to be movable in the axial direction. A square hole into which the drive shaft 2 is inserted is provided at the center of the friction rotor 6. The tip of the drive shaft 2 has a prismatic shape that can be slidably inserted into the square hole. The prism of the drive shaft 2 is inserted into the square hole of the friction rotor 6, and the friction rotor 6 is rotated by the drive shaft 2. When the friction rotor 6 moves in the axial direction, the depth at which the prism is inserted into the square hole changes. The friction rotor 6 is linearly connected to the drive shaft 2. A ridge 13 is provided on the surface of the friction rotor 6 so as to extend in the axial direction. The ridges 13 reduce the slip of waste synthetic resin. Therefore, the friction rotor 6 having the ridges 13 has a feature that the waste synthetic resin can be rubbed together efficiently to generate heat. That is, if a groove is provided in the heat-reduction opening 7 and the ridge 13 is provided in the friction rotor 6, the volume of the waste synthetic resin can be reduced most efficiently by self-heating. The ridges provided on the surface of the friction rotor may be arranged such that the short ridges 13 are extended in the axial direction and are spaced apart from each other, as shown in FIG. The friction rotor 6 has a rotating shaft 6D at the center, which protrudes forward to push out the synthetic resin. The friction rotor 6 has a drive shaft 2
It is supported by the tailstock 3 so as to be movable in the axial direction. The friction rotor 6 moves in the axial direction together with the tailstock 3. Therefore, the rotary shaft 6D of the friction rotor 6 is attached to the tailstock 3
It is rotatably supported, but is supported in a state where it does not move in the axial direction. Rotating shaft protruding from the tip of the friction rotor 6
6D is supported by the tailstock 3 via the bearing 3A. The tailstock 3 can be moved in the axial direction of the volume reducing cylinder 1A,
In addition, it is attached to the base so that it can be fixed at the moving position. The tailstock 3 moves the friction rotor 6 in the axial direction to adjust the friction heating gap between the friction rotor 6 and the volume reducing cylinder portion 1A. When the tailstock 3 is brought close to the cylinder 1 and the friction rotor 6 is pushed deeply into the volume-reducing cylinder portion 1A, the friction heating gap between the friction rotor 6 and the volume-reducing cylinder portion 1A becomes narrow. On the contrary, when the tailstock 3 is separated from the cylinder 1,
The friction heating gap between the friction rotor 6 and the volume reducing cylinder portion 1A becomes wider. When the friction heating gap between the friction rotor 6 and the volume reduction cylinder portion 1A becomes narrow, the waste synthetic resin is rubbed against each other while being strongly pressed in the narrow friction heating gap. For this reason, the amount of heat generated becomes large, and waste synthetic resin with a high melting temperature, or
Waste synthetic resin with high moisture content can be completely melted at higher temperature. If the friction heating gap between the friction rotor 6 and the volume-reducing cylinder portion 1A is adjusted to be wide, the pressing force of the waste synthetic resin becomes weak and the amount of heat generation becomes small. Therefore, this state is optimal for treating waste synthetic resin having a low melting temperature or a low water content. In this state, the amount of synthetic resin discharged per unit time increases. Therefore, the friction heating gap between the friction rotor 6 and the volume-reducing cylinder portion 1A is adjusted to the optimum heat generation amount and treatment amount in consideration of the type of synthetic resin supplied and the water content. By the way, since the volume reduction device for waste synthetic resin of the present invention reduces the volume by causing the synthetic resin to self-heat, the volume reduction cylinder portion 1A
It does not necessarily require heating means such as a heater, but it goes without saying that it is possible to equip this portion with a heater. Volume reduction cylinder part 1A even if equipped with a heater
Since the waste synthetic resin self-heats, the heating capacity of the heater can be reduced. Inside the friction rotor 6, a cooling chamber 6A is provided. The cooling chamber 6A is shown in the sectional view of FIG. The cooling chamber 6A shown in this figure has a double pipe structure. That is, a cooling pipe in which the central pipe 6B and the outer pipe 6C are coaxially inserted is arranged at the center of the friction rotor 6 and the rotating shaft 6D. The right end of the center pipe 6B is open, and the portion between the outer pipe 6C and the center pipe 6B is connected to the center pipe 6B at this portion. A friction heating gap through which cooling water can pass is provided between the central pipe 6B and the outer pipe 6C. The central pipe 6B and the outer pipe 6C are connected to a cooling water supply means C via a rotary joint 15. Center pipe 6B
The left end of is connected to the drain pipe via a rotary joint 15. The friction rotor 6 of this structure has an outer pipe 6C and a central pipe.
Cooling water is supplied between 6B and friction rotor 6 and the rotating shaft
6D and forced cooling. The cooling water that has cooled the friction rotor 6 is discharged to the outside through the central pipe 6B. As the cooling water supply means C, any means for supplying cooling water to the friction rotor 6 can be used. The tap water at room temperature can be used as the cooling water. In this case, the cooling water supply means C does not need a mechanism for forcibly cooling the water. The normal temperature water supplied to the friction rotor 6 can sufficiently cool the friction rotor 6 heated to a high temperature. However, it goes without saying that water can be forcibly cooled and flowed into the cooling chamber 6A of the friction rotor 6. The pushing cylinder portion 1B is connected to the volume reducing cylinder portion 1A. The pushing cylinder portion 1B is opened upward, and the waste synthetic resin supply port 8 is opened. Push cylinder part
Inside the 1B, the screw shaft 5 and the rotary cutter 10 are arranged side by side in the same horizontal plane. Therefore, the pushing cylinder portion 1B is formed in a tubular shape capable of accommodating two shafts. The screw shaft 5 is rotatably arranged inside the pushing cylinder portion 1B. The screw shaft 5 is rotated by the motor 4, and pressure-feeds the waste synthetic resin sent from the supply port 8 to the pushing cylinder portion 1B. Therefore, a spiral fin 9 is provided on the surface of the screw shaft 5. Rotary cutter 10 arranged parallel to the screw shaft 5
Cuts the waste synthetic resin supplied from the supply port 8 into small pieces with the screw shaft 5 and pressure-feeds it to the volume-reducing cylinder portion 1A. Therefore, a plurality of ridges 11 are provided on the surface of the rotary cutter 10 so as to extend vertically, and the entire shape is processed into a spline shape. The tip edge of the ridge 11, in other words, the top edge of the mountain portion of the ridge 11 comes into contact with or is extremely close to the tip edge of the fin 9 of the screw shaft 5, and the fin 9 of the screw shaft and the ridge 11 of the rotary cutter. Use and to clip the waste synthetic resin. Although not shown, the rotary cutter 10 may have a large number of short ridges extending in the axial direction and arranged in a zigzag pattern instead of the spline shape. The rotary cutter 10 is rotated in the opposite direction with respect to the screw shaft 5 so as to sandwich it with the screw shaft 5 and cut the waste synthetic resin. In the volume reducing device shown in FIG. 1, a rotary cutter 10 and a screw shaft 5 are rotated in opposite directions via a gear 12. The inner shape of the pushing cylinder portion 1B is processed such that the fin tips of the screw shaft 5 and the ridge tip edges of the rotary cutter 10 are close to, for example, 0.1 to 5 mm. In this way, the rotary cutter parallel to the screw shaft 5
Since the pushing cylinder part 1B containing 10 cuts the supplied waste synthetic resin into small pieces and pressure-feeds it to the volume reduction cylinder part 1A, the waste synthetic resin in the form of a long string, a sheet, a bag, etc. can be supplied as it is, In addition, waste plastics of various shapes,
It has the feature that it can be made into a shape that can be rubbed efficiently in the next step. However, depending on the type and shape of the waste synthetic resin, the rotary cutter is not necessarily required, and the waste synthetic resin can be pressure-fed to the volume-reducing cylinder portion by the screw shaft. The rear end of the screw shaft 5 is connected to the reduction motor 4 and driven to rotate. By the way, at the rear end of the pushing cylinder part, at the bottom,
Preferably, a drain port (not shown) is opened. When the drain port is opened here, when the waste synthetic resin having a high moisture content is supplied, the moisture contained in the synthetic resin is removed, and the synthetic resin having a low moisture content can be supplied to the volume reducing cylinder portion.

【The invention's effect】

The waste synthetic resin reducing apparatus of the present invention has a rotating shaft fixed in front of the friction rotor, and the rotating shaft is supported by a bearing to dispose the friction rotor at an accurate position of the heat reducing melting opening.
Further, a cooling pipe is provided so as to penetrate the rotary shaft, and the cooling pipe is communicated with the cooling chamber of the friction rotor. The melting apparatus of this structure is a cooling pipe that supplies a cooling liquid to the friction rotor to cool it, and the rotating shaft can be forcibly cooled together with the cooling pipe. The forcibly cooled rotary shaft cools the bearings that support it. That is, the melt reducing apparatus of the present invention cools not only the friction rotor but also the rotating shaft and the bearing together with the cooling liquid. The rotating shaft and the bearing, which are forcibly cooled by the cooling liquid, are not heated to a high temperature by the heat of the friction rotor. Therefore, the device of the present invention has a feature that it is possible to effectively prevent overheating of the bearing and minimize deterioration of the bearing due to heat. This makes it possible to support the friction rotor with a short rotating shaft, and the friction rotor can be disposed at the exact position of the heat-reducing / melting opening to extend the life of the bearing and simplify maintenance. Realize the features. Also, since the friction rotor can be placed at the exact position of the heat reducing melting opening, the friction heating gap between the heat reducing melting opening of the cylinder and the friction rotor can be made uniform accurately, and the waste synthetic resin can be efficiently used in the friction heating gap. Achieves features that allow good dissolution. Further, the reducing apparatus of the present invention can effectively cool the friction rotor with the cooling liquid supplied from the rotating shaft to the cooling chamber. Therefore, it is possible to cool the friction rotor to a low temperature and effectively prevent the molten synthetic resin from adhering to the surface thereof. Therefore, the synthetic resin melted in the friction heating gap is smoothly discharged from between the heat reducing melting opening and the friction rotor. It is extremely important for this type of device that synthetic resin does not adhere to the surface of the friction rotor. It has synthetic resin attached to the friction rotor,
This is because if the distance of the friction heating gap changes, the efficiency of reducing the waste synthetic resin will change significantly. When the synthetic resin adheres to the surface of the friction rotor and the friction heating opening between the friction rotor and the heat generation reducing melting opening becomes narrow, the amount of the synthetic resin discharged due to the decrease in melting becomes remarkably small. Also, when the friction heating gap becomes narrow, the friction heat of the waste synthetic resin increases rapidly,
The discharged synthetic resin is deteriorated by heat and cannot be effectively reused. In order to prevent this adverse effect, if the friction heating gap between the friction rotor and the heat generation reducing melting opening is set to be wide, the waste synthetic resin cannot be efficiently heated and reduced so that the synthetic resin does not adhere to the friction rotor. INDUSTRIAL APPLICABILITY The reducing alloy device of the present invention can efficiently cool the friction rotor to effectively prevent the synthetic resin from adhering, and dispose the friction rotor at the correct position of the heat reducing melting opening to dispose of the waste synthetic resin. Efficiently dissolves and discharges. Further, in the melting apparatus of the present invention, the cooling pipe is inserted into the rotary shaft, and the mechanism for cooling the friction rotor is also used for cooling the rotary shaft and the bearing. Therefore, the friction rotor and the rotary shaft have an extremely simple structure. It has the feature that it can forcibly cool the bearings. Therefore, the reducing agent of the present invention can efficiently reduce the amount of waste synthetic resin, can smoothly separate and take out the reduced synthetic resin, and further simplify the maintenance and reduce the cost with a simple structure. Achieve excellent features that can be manufactured.

[Brief description of drawings]

1 and 2 are schematic cross-sectional views and perspective views of a waste synthetic resin reducing apparatus according to an embodiment of the present invention, and FIG. 3 is a side view showing another embodiment of a friction rotor, and FIG. FIG. 5 is a cross-sectional view showing an embodiment of a friction rotor. FIG. 5 is a cross-sectional view of a conventional melt reducing device. 1 …… Cylinder, 1A …… Reduced melting cylinder part, 1B …… Pushing cylinder part 2 …… Drive shaft 3 …… Tailstock, 3A …… Bearing 4 …… Motor 5 …… Screw shaft 6 …… Friction rotor, 6A …… Cooling chamber, 6B …… Center pipe 6C …… Outer pipe, 6D …… Rotating shaft 7 …… Heating reduction melting opening 8 …… Supply port 9 …… Fin 10 …… Rotary cutter 11 …… Convex strip 12… … Gear 13 …… Convex strip 15 …… Rotary joint C …… Cooling water supply means

Claims (1)

[Claims] 1. A cylinder (1) for reducing waste synthetic resin.
And a friction rotor (6), and the friction rotor (6) is disposed in the heat generation reducing opening (7) of the cylinder (1) so that the outer periphery of the friction rotor (6) and the heat generation reducing opening (7) are A friction heating gap is formed between the inner surface and the inner surface of the waste synthetic resin, which is friction-heated to reduce the temperature of the waste synthetic resin.
Further, the friction rotor (6) is provided with a cooling chamber (6A) for forced cooling therein, and has a rotating shaft (6D) protruding forward from which the reduced-melted synthetic resin is extruded. In the waste synthetic resin reducing device in which the shaft (6D) rotatably supports the friction rotor (6) through the bearing (3A), the rotary shaft (6D) of the friction rotor (6) is vertically penetrated. , A cooling pipe is incorporated in communication with the cooling chamber (6A) of the friction rotor (6), and the cooling liquid supplied to the cooling chamber (6A) through the cooling pipe to cool the friction rotor (6) is A device for reducing the amount of waste synthetic resin, which is configured to be used together to cool a rotating shaft (6D) of a friction rotor (6) and a bearing (3A) supporting the rotating shaft (6D).