JP2010030105A - Hot cuter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot cutter capable of favorably observing the inside of a cutter case even in the case that a pellet is manufactured of waste plastics. <P>SOLUTION: The hot cutter has a die 2 having a die hole formed thereto, a cutter unit 4 equipped with a cutter holder for holding a cutter blade 3 and rotationally driving the cutter holder, the cutter case 5 for housing the cutter blade 3, the cooling means 7 arranged in the cutter case 5 in order to cool the cutter blade 3, visualizing means 6 and 10 for visualizing a region where the pellets 20 are cut by the cutter blade 3 in the cutter case 5, air sending means 12, 14 and 18a for supplying air into the cutter case 5 from the lower part of the cutter case 5 and exhaust means 15, 17 and 18b for discharging exhaust air from the upper part of the cutter case 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hot cut apparatus for producing pellets from a molten resin, and more particularly to a hot cut apparatus used by being connected to a waste plastic extruder.

  FIG. 3 is a schematic configuration diagram of a conventional hot cut device disclosed in Patent Document 1. In FIG.

  The conventional hot-cut apparatus granulates pellets 120 by continuously cutting the die 102 formed with a plurality of die holes (not shown) for continuously extruding the resin and the resin extruded from the die holes. And a cutter case 105 in which the cutter blade 103 of the cutter unit 104 is accommodated. A cooling water nozzle 107 that supplies cooling water toward the cutter blade 103 is also disposed in the cutter case 105.

  In the configuration shown in FIG. 3, the cutter case 105 has a box (substantially rectangular parallelepiped) shape, and the die 102 is attached to one side surface portion thereof, and the cutter unit 104 is attached to the opposite side surface portion. A cutter window 106 for observing the inside of the cutter case 105 is provided on the opposed side surface portions of the cutter case 105.

  Furthermore, a camera (fiber scope) 110 that images the inside of the cutter case 105 and a light source 111 that irradiates light to an imaging area of the camera 110 in the cutter case 105 are provided on the peripheral side wall of the cutter case 105.

  An extruder 101 is connected to the die 102, and the resin pumped by the extruder is continuously extruded from the die hole to the cutter unit 104.

  The cutter unit 104 includes a cutter blade 103 in a cutter holder, is driven to rotate by a motor (not shown), and can be moved forward and backward by a handle for forward and backward movement (not shown). The resin continuously extruded from the die hole into the cutter case 105 is continuously cut into pellets 120 by the cutter blade 103 driven to rotate by a motor. The pellet 120 is continuously discharged below the cutter case 105. Below the cutter case 105, a supply port (not shown) for supplying cooling water for cooling and transporting the pellet 120 is disposed. The pellets 120 are cooled by cooling water for cooling and transporting, and are carried by a pipe conveyor 109 disposed below the cutter case 105 along the flow of cooling water for cooling and transporting.

  An exhaust port 115 is provided in the upper part of the cutter case 105, and an exhaust pump 117 is connected to the exhaust port 115 via a pipe 118.

FIG. 4 is a schematic configuration diagram of another conventional hot cut device. In the hot cut apparatus shown in FIG. 4, a camera 110 is installed outside the cutter case 105, and the inside of the cutter case 105 is imaged through a cutter window 106 provided in the cutter case 105. The other structure of the hot cut apparatus shown in FIG. 4 is the same as that of the hot cut apparatus shown in FIG.
JP 2004-230874 A

  In the hot cut apparatus shown in FIGS. 3 and 4, when waste plastic is used as the resin material of the pellet 120, waste plastic that has been melted or reduced in volume or pyrolyzed and dechlorinated by the extruder 101 is discharged from the die 102. However, since waste plastic includes foreign substances (low boiling point substances) and various plastics having different melting points, pyrolysis gas 119 is likely to be generated. Further, when an extrusion-type dehydrochlorination device is used as the extruder 101, the temperature of the waste plastic is further increased and the waste plastic is thermally decomposed, so that more pyrolysis gas 119 is discharged from the die 102 together with the discharged resin. .

  Further, the cooling water sprayed from the cooling water nozzle 107 toward the cutter blade 103 is applied to the die 102 heated by a heater (not shown) as the cutter blade 103 rotates, or the high-temperature pellet 102 is turned into the cooling water. Water vapor is generated by contact.

  In the hot cut apparatus shown in FIGS. 3 and 4, these pyrolysis gas 119 and water vapor are discharged by an exhaust pump 117 connected to an exhaust port 115 installed in the cutter case 105. However, since a sufficient exhaust speed (flow velocity in the case) cannot be obtained with a configuration in which the exhaust pump 115 only discharges from the exhaust port 115, there is a possibility that the pyrolysis gas 119 and water vapor will be filled in the cutter case 105. There is. Since the pyrolysis gas 119 adheres to the cutter window 106 and the camera 110 and is fixed by being cooled, the cutter window 106 and the camera 110 may become dirty and observation in the cutter case 105 may be impossible. . In this case, it is necessary to stop the apparatus and clean the cutter window 106 and the camera 110.

  Further, the water vapor generated in the cutter case 105 adheres to the cutter window 106 and the camera 110 as water droplets, or the inside of the cutter case 105 becomes cloudy white due to the water vapor. Observation may be impossible.

  Therefore, an object of the present invention is to provide a hot cut device that can satisfactorily observe a cutter case even when pellets are produced from waste plastic.

  In order to achieve the above object, a hot-cut device of the present invention includes a die having a die hole through which molten resin is extruded, and a cutter holder that holds a cutter blade that cuts the molten resin extruded from the die hole. A cutter unit that rotationally drives the cutter holder; a cutter case that houses the cutter blade; a cooling means disposed in the cutter case for cooling the cutter blade; and the cutter in the cutter case Visualizing means for visualizing a region where the pellet is cut by a blade, air supply means for supplying air into the cutter case from the lower part of the cutter case, and exhaust means for discharging exhaust air from the upper part of the cutter case Have.

  In the hot cut device of the present invention, air is forcibly supplied from the lower part of the cutter case into the cutter case by the air supply means. When pelletizing pellets from waste plastic, pyrolysis gas and the like are generated around the die, but the air supplied into the cutter case flows upward in the cutter case while entraining such pyrolysis gas and the like. . And the exhaust air containing pyrolysis gas etc. is exhausted by the exhaust means from the upper part of a cutter case. As described above, according to the hot cut device of the present invention, the pyrolysis gas and the like generated in the cutter case are quickly discharged on the flow of air supplied from the air supply means. Can be maintained well, and even in the case of producing pellets from waste plastic, it is possible to satisfactorily observe the region where the pellets are cut by the cutter blade in the cutter case. Furthermore, the visualization means for visualizing the region where the pellet is cut by the cutter blade in the cutter case can be prevented from being contaminated by pyrolysis gas or the like.

  Moreover, the hot cut apparatus of this invention may have a heating means to heat the air supplied in the said cutter case. The hot-cut device of the present invention includes a cooling means. If the die temperature is excessively lowered by this, the resin is solidified at the outlet of the die hole and the die hole may be blocked. On the other hand, in the present invention, since the air heated by the heating means can be supplied, it is possible to prevent the die from being excessively cooled and to reduce the possibility that the die hole is blocked.

  In addition, the hot cut device of the present invention may have a purifying means for purifying exhaust air discharged from the cutter case. By purifying the exhaust air by the purifying means, it is possible to remove the pyrolysis gas contained in the exhaust air, so that it is possible to suppress the occurrence of problems that may occur in the exhaust means due to the pyrolysis gas.

  Furthermore, the hot cut device of the present invention may have a light source that illuminates the inside of the cutter case. Thereby, even if the hot cut device is installed in a dark factory, a clear image in the cutter case can be obtained. In addition, a light source having a variable light emission period such as a stroboscopic light source may be used as the light source. According to this, the cutting state of the pellets by the cutter blade is displayed as a still image by synchronizing the light emission period with the rotation speed of the cutter unit. It becomes possible to observe in detail as follows.

  Further, in the hot cut device according to the present invention, the visualization means further includes a camera that images a region in the cutter case where the pellet is cut, and further includes a monitor that displays an image captured by the camera. It is good also as a structure to have. The monitor can be installed, for example, in a place away from the site where the hot cut device is installed (such as a central control room), so that the operator can stay away from the site where the hot cut device is installed. Thus, the state of the hot cut device can be remotely monitored by viewing the video taken by the camera. Therefore, it is not necessary to monitor the hot cut device at the site where the hot cut device is installed, so that labor saving can be achieved. In addition, since the hot cut device can be constantly monitored even from a location away from the site where the hot cut device is installed, it is possible to respond immediately when a failure occurs in the hot cut device, and the equipment downtime Can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, even when manufacturing a pellet from waste plastics, the hot cut apparatus which can perform observation in a cutter case favorably can be provided.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of a hot cut device according to an embodiment of the present invention.

  The hot cut device of the present embodiment continuously cuts the pellet 2 by cutting the die 2 formed with a plurality of die holes (not shown) for continuously extruding the resin and the resin extruded from the die holes. And a cutter unit 4 for manufacturing. Further, the hot cut device has a cutter case 5 that accommodates the cutter blade 3 and the cooling water nozzle 7 of the cutter unit 4 therein. In order to cool the cutter blade 3 and prevent adhesion of the pellets 20, cooling water is supplied toward the cutter blade 3 from the cooling water nozzle 7 which is a cooling means.

  The cutter case 5 of the present embodiment has a box (rough rectangular parallelepiped) shape, and the die 2 is attached to one side surface portion thereof, and the cutter unit 4 is attached to the opposite side surface portion. A cutter window 6 for observing the inside of the cutter case 5 from the outside is provided on the side surface portions of the cutter case 5 facing each other. The cutter case 5 also has a role of preventing scattering of the cooling water and pellets 20 from the cooling water nozzle 7 and diffusion of generated pyrolysis gas.

  Further, a camera 10 is installed outside the cutter case 5 and is configured to take an image of the inside of the cutter case 5 through a cutter window 6 provided in the cutter case 5. Further, a light source 11 that irradiates light to an imaging region of the camera 10 in the cutter case 5 is provided on the peripheral side wall of the cutter case 5. The camera 10 is connected to a monitor 21 installed in the central control room 22. The cutter window 6 and the camera 10 form a visualization means for visualizing an area where the pellet 20 is cut by the cutter blade 3 in the cutter case 5. However, the visualization means does not need to include both the cutter window 6 and the camera 10, and may be configured to include only the cutter window 6. In that case, the operator can visually observe the inside of the cutter case 5 through the cutter window 6.

  An extruder 1 is connected to the die 2, and the resin pumped by the extruder 1 is continuously extruded from the die hole to the cutter unit 4. In the present embodiment, the extruder 1 is a single-screw or twin-screw type screw volume reducer that reduces and solidifies waste plastic, or further heats and decomposes the chlorine-based resin contained in the waste plastic. Thus, a single screw or twin screw type screw dehydrochlorination apparatus for removing hydrogen chloride is used.

  The cutter unit 4 includes a cutter holder that holds the cutter blade 3. The cutter holder is driven to rotate by a motor (not shown) and can be moved forward and backward by a handle for forward and backward movement (not shown). The resin continuously extruded from the die hole into the cutter case 5 is continuously cut into pellets 20 by the cutter blade 3 that is rotationally driven by a motor. The pellet 20 is continuously discharged below the cutter case 5. A supply port (not shown) for supplying cooling water for cooling and transporting the pellets 20 is disposed below the cutter case 5. The pellet 20 is cooled by cooling water for cooling and transporting, and is carried by the water tank portion 8 and the pipe conveyor 9 disposed below the cutter case 5 along the flow of cooling water for cooling and transporting.

  A plurality of inlets 14 are provided in the lower part of the cutter case 5, and the blower 12 is connected to the inlets 14 via a pipe 18 a. These constitute air supply means for supplying air into the cutter case 5 from the lower part of the cutter case 5. Furthermore, a heater 13 that is a heating means for heating the air sent from the blower 12 is installed in a portion between the blower 12 and the inlet 14 of the pipe 18a. For example, an electric heater can be used as the heater 13. With these configurations, the air sent from the blower 12 into the pipe 18 a and heated by the heater 13 is supplied into the cutter case 5 from the inlet 14 provided at the lower part of the cutter case 5. . In addition, the inflow port 14 is directed to the die 2 in the cutter case 5, and the shape and number of the inflow ports 14 can be appropriately determined according to the operating conditions of the hot cut device.

  Further, an exhaust port 15 is provided in the upper part of the cutter case 5, and an exhaust pump 17 is connected to the exhaust port 15 via a pipe 18b. These constitute exhaust means for exhausting exhaust air from the upper part of the cutter case 5. Further, a scrubber which is a purifying means for purifying the exhaust air by removing pyrolysis gas contained in the exhaust air discharged from the exhaust port 15 is provided in a portion between the exhaust port 15 and the exhaust pump 17 of the pipe 18b. 16 is installed. According to this scrubber 16, it is possible to purify the exhaust air from the cutter case 5 by removing the pyrolysis gas from the exhaust air discharged from the cutter case 5.

  In the hot cut device according to the present embodiment, the air sent from the blower 12 through the pipe 18 a is forcibly supplied into the cutter case 5 from the plurality of inlets 14 installed at the lower part of the cutter case 5. . The inlet 14 is directed to the die 2, and the air supplied from the inlet 14 passes through the cutter case 5 while entraining pyrolysis gas and water vapor generated around the die 2 when the pellet 20 is produced. Flows upward. Then, exhaust air containing pyrolysis gas and water vapor is exhausted from the cutter case 5 by the exhaust pump 17 from the exhaust port 15 through the pipe 18b. In this way, the pyrolysis gas and water vapor generated in the cutter case 5 are quickly discharged on the air flow supplied from the inlet 14, so that the visibility in the cutter case 5 is maintained well. Therefore, it is possible to satisfactorily observe the region where the pellet 20 is cut by the cutter blade 3 in the cutter case 5. Furthermore, it is possible to prevent the cutter window 6 and the camera 10 installed in the cutter case 5 from becoming dirty.

  As a matter of course, the exhaust capacity of the exhaust pump 17 is set to be larger than the air supply capacity of the blower 12. However, these capacities are appropriately determined depending on the processing capability of the hot cut device, processing conditions, the type of resin raw material used, and the like. Similarly, the shape and the number of the inflow ports 14 and the exhaust ports 15 are appropriately determined according to the conditions.

  Furthermore, in this embodiment, the heater 13 is installed in the part between the air blower 12 and the inflow port 14 of the piping 18a, and the air heated by the heater 13 is blown toward the die 2 from the inflow port 14. It is possible.

  In the configuration described above, cooling water is sprayed from the cooling water nozzle 7 toward the cutter blade 3 in order to cool the cutter blade 3 and prevent adhesion of the pellets 20. When this cooling water is applied to the die 2 heated by (not shown), the temperature of the die 2 may drop in some cases, and the resin may solidify at the outlet of the die hole, and the die hole may be blocked. In contrast, in the present embodiment, since heated air is supplied from the inlet 14 into the cutter case 5, it is possible to prevent the die 2 from being excessively cooled and to reduce the possibility of the die hole being blocked. . Further, by blowing the heated air from the inlet 14 toward the die 2, the cooling water applied to the die 2 can be quickly removed from the die 2. In addition, a heat insulating cover (not shown) made of a heat insulating material or the like is attached to the pipe 18a, particularly between the heater 13 and the inlet 14, as necessary, so that the air heated by the heater 13 can be cut into the cutter case. It is possible to reduce heat loss that may occur before being transported to 5.

  In the hot cut device of the present embodiment, a scrubber 16 that purifies exhaust air exhausted from the cutter case 5 is installed in a pipe 18 b extending from the exhaust port 15 of the cutter case 5. As the scrubber 16, for example, a wet scrubber can be used. The pyrolysis gas discharged from the cutter case 5 when producing the pellets 20 from waste plastic contains oil and phthalic acid-based decomposition products. If these components of the pyrolysis gas are cooled and solidified in the pipe 18b or the exhaust pump 17, the pipe 18b may be blocked or the exhaust pump 17 may have a reduced capacity. On the other hand, in this embodiment, since the scrubber 16 is installed in the pipe 18b, the scrubber 16 can remove the above components of the pyrolysis gas.

  Furthermore, since the hot cut apparatus of this embodiment has the light source 11 which illuminates the imaging area of the camera 10 in the cutter case 5, even when the hot cut apparatus is installed in a dark factory. A clear image in the cutter case 5 can be obtained. Further, a light source 11 having a variable light emission period such as a stroboscopic light source may be used. According to this, the cutting state of the pellet 20 by the cutter blade 3 is achieved by synchronizing the light emission period with the rotation speed of the cutter unit 4. Can be observed in detail like a still image.

  In the hot cut device according to the present embodiment, the camera 10 provided in the cutter case 5 is connected to a monitor 21 installed in the central control room 22. The monitor 21 displays an image captured by the camera 10. Thereby, the operator can remotely monitor the state of the hot cut device by looking at the video imaged by the camera 10 while staying in the central control room 22 away from the site where the hot cut device is installed. . This eliminates the need for on-site monitoring of the hot cut device, thereby saving labor. In addition, since the hot cut device can be constantly monitored even from the central control room 22, it is possible to respond quickly when a failure occurs in the hot cut device, and to reduce the facility downtime. .

  FIG. 2 is a schematic configuration diagram illustrating a modification of the hot cut device illustrated in FIG. 1.

  In the hot-cut apparatus shown in FIG. 1, a water tank unit 8 is installed between the cutter case 5 and the pipe conveyor 9, but as shown in FIG. 2, the water tank unit 8 is omitted and the pellet 20 is removed from the cutter case. It is good also as a structure discharged | emitted from 5 to the pipe conveyor 9 directly.

  Further, in the hot cut device shown in FIG. 1, the camera 10 is installed at a position where the inside of the cutter case 5 is imaged through the cutter window 6 provided in the cutter case 5, but as shown in FIG. The camera 10 may be installed on the peripheral side wall 5. In this configuration, each of the camera 10 and the cutter window 6 constitutes a visualization means for visualizing an area where the pellet 20 is cut by the cutter blade 3 in the cutter case 5.

It is a schematic block diagram of the hot cut apparatus which concerns on one Embodiment of this invention. It is a schematic block diagram which shows the modification of the hot cut apparatus shown in FIG. It is a schematic block diagram of the conventional hot cut apparatus. It is a schematic block diagram of the other conventional hot cut apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Extruder 2 Die 3 Cutter blade and cutter holder 4 Cutter unit 5 Cutter case 6 Cutter window 7 Cooling water nozzle 8 Water tank section 9 Pipe conveyor 10 Camera 11 Light source 12 Blower 13 Heater 14 Inlet 15 Exhaust outlet 16 Scrubber 17 Exhaust pump 18a, 18b Piping 20 Pellet 21 Monitor 22 Central control room

Claims (5)

A die (2) formed with a die hole through which molten resin is extruded;
A cutter unit (4) comprising a cutter holder for holding a cutter blade (3) for cutting the molten resin extruded from the die hole, and for rotating the cutter holder;
A cutter case (5) containing the cutter blade (3) therein;
Cooling means (7) disposed in the cutter case (5) for cooling the cutter blade (3);
Visualization means (6, 10) for visualizing an area in the cutter case (5) where the pellet (20) is cut by the cutter blade (3);
Air supply means (12, 14, 18a) for supplying air into the cutter case (5) from the lower part of the cutter case (5);
Exhaust means (15, 17, 18b) for exhausting exhaust air from the upper part of the cutter case (5);
Having a hot cut device.   The hot cut device according to claim 1, further comprising a heating means (13) for heating air supplied into the cutter case (5).   The hot cut device according to claim 1 or 2, further comprising a purification means (16) for purifying exhaust air discharged from the cutter case (5).   The hot cut device according to any one of claims 1 to 3, further comprising a light source (11) that illuminates the interior of the cutter case (5). The visualization means includes a camera (10) that images a region where the pellet (20) in the cutter case (5) is cut,
The hot cut device according to any one of claims 1 to 4, further comprising a monitor (21) for displaying an image captured by the camera (10).

Images