JP3644293B2 - Synthetic resin melt granulation apparatus and method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a synthetic resin melt granulation method for melting and granulating a synthetic resin, particularly a film-like synthetic resin.
[0002]
[Prior art]
In recent years, plastics and other synthetic resins have been rapidly increasing as industrial waste and general waste, and the treatment thereof has become a big problem. Among them, plastics, which are high molecular weight hydrocarbon compounds, generate a large amount of heat during combustion and are difficult to process in large quantities because they damage the incinerator when incinerated. Most of them are dumped in landfills. The current situation is. However, the dumping of plastic or the like is not preferable in terms of environmental measures, and the development of a treatment method is demanded.
[0003]
In such a background, a method of using such a synthetic resin as a waste material as a raw material or auxiliary fuel for a blast furnace or the like is disclosed in Japanese Patent Publication No. 8-507105 and Japanese Patent Publication No. 51-33493. .
[0004]
Further, in the above prior art, since a film-like synthetic resin has poor fluidity and is difficult to blow, a blowing method that can be blown as a raw material for a furnace such as a blast furnace is disclosed in Japanese Patent Application Laid-Open No. Hei 9 (1994). -137926. The technology disclosed in this publication involves granulating a film-like synthetic resin and other synthetic resins in different steps, and blowing these granular synthetic resins into a furnace such as a blast furnace by air feeding.
[0005]
In the actual operation using the above technology, a melt granulator having a rotary blade is used to process the film-like synthetic resin, and the film-like synthetic resin is cut with the rotary blade and melted with frictional heat to form particles. Is granulated.
[0006]
In such melt granulation processing, from the viewpoint of improving productivity, 2 to 6 of the above melt granulators are arranged in parallel, and a certain amount of raw material is put into each granulator at a time for processing. Is going.
[0007]
However, although using a plurality of granulators in this manner increases the total production volume, there is a problem that the equipment cost per processing volume is high. In order to lower the equipment cost per processing volume, it is necessary to improve the production volume per granulator, but as described above, when a raw material is charged, a certain amount is charged at once. Therefore, it is difficult to improve the production volume per vehicle.
[0008]
[Problems to be solved by the invention]
This invention is made | formed in view of this situation, Comprising: It aims at providing the melt granulation apparatus and the melt granulation method with high production capacity and low equipment cost per process amount.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, the present invention firstly includes a container into which a synthetic resin raw material is charged,
A material supply mechanism that can be supplied over a plurality of times and that supplies the material to the container;
A melt cutting mechanism for cutting while melting the synthetic resin raw material in the container;
A load detecting means for detecting a load of a drive unit of the melt cutting mechanism;
A synthetic resin melt granulation apparatus is provided, comprising control means for permitting the supply of the raw material of the raw material supply mechanism until the detection value of the load detection means reaches a predetermined value.
[0010]
The present invention secondly, a container into which a synthetic resin raw material is charged,
A material supply mechanism that can be supplied over a plurality of times and that supplies the material to the container;
A melt cutting mechanism for cutting while melting the synthetic resin raw material in the container;
A cooling mechanism for cooling the inside of the container;
A discharge mechanism for discharging the melt-granulated synthetic resin from the container;
A load detecting means for detecting a load of a drive unit of the melt cutting mechanism;
Temperature detecting means for detecting the container or the temperature therein;
Vibration detecting means for detecting the vibration of the container;
Based on the detection values of the load detection means, the temperature detection means, and the vibration detection means, the raw material supply mechanism feeds the raw material multiple times, the cooling mechanism cools the container, and the discharge And a control means for controlling the discharge timing of the synthetic resin that has been melt-granulated by the mechanism.
[0011]
Third, the present invention is a synthetic resin melt granulation method in which a synthetic resin raw material is put into a container, cut while melting by a melt cutting mechanism, and granulated into predetermined grains,
Provided is a synthetic resin melt granulation method in which a raw material is charged into the container a plurality of times until the load of a drive unit of the melt cutting mechanism reaches a predetermined value.
[0012]
Fourth, the present invention is a synthetic resin melt granulation method in which a synthetic resin raw material is put into a container, cut while melting by a melt cutting mechanism, and granulated into predetermined grains,
The load of the driving unit of the melt cutting mechanism, the temperature in the container, and the vibration of the container are detected, and based on the detected values, the raw material charging timing over a plurality of times, the cooling timing in the container, and Provided is a synthetic resin melt granulation method characterized by controlling the discharge timing of melt granulated synthetic resin.
[0013]
According to the first and third aspects of the present invention, it is controlled so that the raw material is charged into the container a plurality of times until the load of the driving unit of the melt cutting mechanism reaches a predetermined value. The total amount of raw materials can be increased. Therefore, the production capacity per device can be increased, and the equipment cost per processing amount can be reduced.
[0014]
Further, according to the second and fourth aspects of the present invention, the load of the driving unit of the melt cutting mechanism, the temperature of the container or the temperature thereof, and the vibration of the container are detected, and a plurality of times are determined based on the detected values. Control of the raw material supply timing, the cooling timing in the container, and the discharge timing of the melted and granulated synthetic resin, it is possible to automatically optimize these, and the total amount of raw materials to be input While being able to increase, processing time can be shortened by suitable cooling and discharge | emission timing. Therefore, the production capacity per apparatus can be extremely increased, and the equipment cost per processing amount can be further reduced.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic configuration diagram showing a synthetic resin melt granulator used for carrying out the present invention. This melt granulator 1 has an elliptical cylindrical container 2, and a rotating member 3 is disposed horizontally in the vicinity of the bottom of the container. Cutting blades 4 are attached to both ends of the rotating member 3. The rotating member 3 is rotated at, for example, 1500 rpm by a motor 5 provided under the container 2. These rotating member 3, cutting blade 4 and motor 5 constitute a melt granulation mechanism.
[0016]
Above the container 2, a raw material supply mechanism 6 for supplying a synthetic resin raw material is provided. As shown in the plan view of FIG. 2, the raw material supply mechanism 6 includes a hopper 7 that stores the synthetic resin raw material P, and a supply container 8 that temporarily receives the synthetic resin raw material when the synthetic resin raw material is supplied to the container 2. The piston 10 for supplying the raw material in the supply container 8 toward the container 2 and the hydraulic cylinder 9 for driving the piston 10 are provided. Reference numeral 11 denotes a compression device that compresses and transfers the raw material in the hopper 7 before the piston 10, 11 a is a guide member of the compression device 11, and 12 is for reliably dropping the raw material into the container 2. Pushing device.
[0017]
A discharge port 13 for discharging the granulated material is formed in the vicinity of the bottom of the side wall of the container 2. The discharge port 13 is opened and closed by a gate 14, and the gate 14 is opened when discharging the granulated material.
[0018]
A watering nozzle 15 for supplying cooling water into the container 2 is provided on the upper side wall of the container 2, and an opening / closing valve 16 is provided in the cooling water pipe. Further, an ammeter 17 for detecting the load of the motor, a temperature sensor 18 for measuring the temperature in the container 2, and a vibration detector 19 for detecting the vibration of the container 2 are provided.
[0019]
The control device 20 receives the signal from the ammeter 17 and allows the raw material supply mechanism 6 to supply the raw material until the detected value reaches the predetermined value, and stops the supply of the raw material when the predetermined value is reached. Thus, the light compression cylinder 9 is controlled. The control device 20 receives signals from the temperature sensor 18 and the vibration detector 19, controls the valve 16 based on the detection value of the vibration detector 19, and starts watering from the watering nozzle 15. Based on the detected value of the sensor 18, the valve 16 is controlled to stop watering. Furthermore, the control device 20 controls the discharge timing of the granulated material based on the detection value of the ammeter 17.
[0020]
In such a melt granulator 1, for example, a film-like synthetic resin P is stored in the hopper 7, and after pulling the compression device 11, the raw material P is pushed in front of the piston 10, and the piston is moved by the hydraulic cylinder 9. The raw material P is put into the container 2 by advancing 10. The raw material P is charged a plurality of times. In the container 2, the synthetic resin material P is cut by the cutting blade 4 while rotating the rotating member 3, and at the same time, the synthetic resin material P cut by frictional heat is melted and granulated to form a granulated product. . The formed granulated material is discharged from the discharge port 13. This completes one batch of processing.
[0021]
The raw material supply timing, watering timing, and granulated product discharge timing in this granulation process are controlled by the control device 20. This control will be described with reference to FIGS.
[0022]
First, in the supply of the raw material P, first, it is confirmed whether the motor 5 is rotating and the gate 14 is closed, and when these are confirmed, the cylinder 9 is controlled to supply a predetermined amount of the raw material P to the container 2. The synthetic resin material P is cut and granulated with the cutting blade 4 while rotating the rotating member 3. At this time, the current value, that is, the load of the motor 5 increases, but the current value becomes constant due to the volume reduction of the input material. When the current value becomes constant in this way, the control device 20 sends a control signal to the cylinder 9 and inputs a predetermined amount of the raw material P again. Such material charging is repeated a plurality of times, and when the current value of the motor 5 reaches the set maximum value, the material charging is stopped.
[0023]
If the cutting and granulation are continued, the temperature in the container 2 rises and the vibration amplitude of the container 2 increases. However, if the processing is continued as it is, the raw material will melt and become suddenly moved to the motor 5. Since an excessive load is applied and the motor 5 stops, when the vibration amplitude reaches the set value ΔW, the control device 20 outputs a signal to the valve 16 to start watering. Although the temperature in the container 2 decreases due to this watering, the efficiency decreases if the temperature decreases too much. Therefore, when the temperature reaches the set value ΔT, the control device 20 outputs a signal to the valve 16 to spray the water. Stop.
[0024]
After stopping watering and further granulating, the gate 14 is opened by the command from the control device 20 when the amount of change in the current value reaches a predetermined value, and the granulated material is discharged from the discharge port 13. Is discharged. Then, when the current value drops to a predetermined value, the gate 14 is closed to prepare for the next batch process.
[0025]
On the other hand, conventionally, the control device 20 is not provided, and as shown in FIG. 4, the raw material is charged only once at a constant volume, and may be charged multiple times or once. You cannot change the amount of input. Moreover, the timing of watering and the timing of discharge were also performed by the operator's operation.
[0026]
In the present embodiment, as described above, the control device 20 performs control so that the raw material is charged into the container a plurality of times until the current value that is an index of the load of the motor 5 reaches a predetermined value. Therefore, the total amount of raw materials to be input can be increased as compared with the conventional case. Therefore, the production capacity per device can be increased, and the equipment cost per processing amount can be reduced.
[0027]
Further, the current of the motor 5, the temperature in the container 2, and the vibration of the container 2 are detected, and based on those detection values, the raw material charging timing, cooling timing in the container 2, and melt granulation are performed several times. Since the discharge timing of the synthetic resin is controlled, it is possible to optimize these automatically and not only increase the total amount of raw materials to be charged, but also the processing time with appropriate cooling and discharge timing. Can be shortened. Therefore, the production capacity per apparatus can be further increased.
[0028]
The present invention is not limited to the above embodiment and can be variously modified. For example, although a hydraulic cylinder was used as the raw material supply mechanism, the present invention is not limited to this, as long as the supply amount of the raw material can be adjusted and the raw material can be supplied multiple times, such as a conveyor and a screw feeder. Good. Further, although the temperature sensor is provided inside the container, it may be provided on the outer wall of the container. Furthermore, although water was supplied for cooling, other cooling means may be used.
[0029]
【The invention's effect】
As described above, according to the present invention, control is performed so that the raw material is charged into the container a plurality of times until the load of the driving unit of the melt cutting mechanism reaches a predetermined value. The total amount of raw materials can be increased. Therefore, the production capacity per apparatus can be increased, and the equipment cost per processing amount can be reduced.
[0030]
In addition, according to the present invention, the load of the driving unit of the melt cutting mechanism, the temperature of the container or the container, and the vibration of the container are detected, and the raw material charging timing is performed a plurality of times based on the detected values. In addition, since the cooling timing in the container and the discharge timing of the melted and granulated synthetic resin are controlled, it is possible to automatically optimize them and increase the total amount of raw materials to be charged. The processing time can be shortened by appropriate cooling and discharging timing. Therefore, the production capacity per apparatus can be extremely increased, and the equipment cost per processing amount can be further reduced.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a melt granulator according to the present invention.
FIG. 2 is a plan view showing a raw material supply mechanism of the apparatus of FIG.
FIG. 3 is a view for explaining a processing flow when performing melt granulation processing according to the present invention.
FIG. 4 is a diagram for explaining a flow when performing conventional melt granulation processing;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1; Melt granulator 2; Container 3; Rotating member 4; Cutting blade 5; Motor 6; Raw material supply mechanism 7; Hopper 8; Supply container 9: Light compression cylinder 13; Valve 17; ammeter 18; temperature sensor 19; vibration detector 20;

Claims (4)

A container into which a synthetic resin raw material is charged;
A material supply mechanism that can be supplied over a plurality of times and that supplies the material to the container;
A melt cutting mechanism for cutting while melting the synthetic resin raw material in the container;
A load detecting means for detecting a load of a drive unit of the melt cutting mechanism;
A synthetic resin melt granulation apparatus, comprising: a control unit that allows the supply of the raw material of the raw material supply mechanism until the detection value of the load detection unit reaches a predetermined value. A container into which a synthetic resin raw material is charged;
A material supply mechanism that can be supplied over a plurality of times and that supplies the material to the container;
A melt cutting mechanism for cutting while melting the synthetic resin raw material in the container;
A cooling mechanism for cooling the inside of the container;
A discharge mechanism for discharging the melt-granulated synthetic resin from the container;
A load detecting means for detecting a load of a drive unit of the melt cutting mechanism;
Temperature detecting means for detecting the container or the temperature therein;
Vibration detecting means for detecting the vibration of the container;
Based on the detection values of the load detection means, the temperature detection means, and the vibration detection means, the raw material supply mechanism feeds the raw material multiple times, the cooling mechanism cools the container, and the discharge And a control means for controlling the discharge timing of the synthetic resin melted and granulated by the mechanism. A synthetic resin raw material is charged into a container, cut while melting by a melt cutting mechanism, and granulated into a predetermined particle, and is a granulation method of synthetic resin,
The synthetic resin melt granulation method, wherein the raw material is charged into the container a plurality of times until the load of the drive unit of the melt cutting mechanism reaches a predetermined value. A synthetic resin raw material is charged into a container, cut while melting by a melt cutting mechanism, and granulated into a predetermined particle, and is a granulation method of synthetic resin,
The load of the driving part of the melt cutting mechanism, the temperature of the container or the container, and the vibration of the container are detected. Based on the detected values, the raw material charging timing, the cooling timing in the container are performed several times. And a method for melting and granulating synthetic resin, wherein the discharge timing of the melted and granulated synthetic resin is controlled.

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