JPH11230670A - Continuous powder particle temperature controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heat and cool powder particles to a desired temperature in a short time by measuring a real temperature of the particles to be discharged from a temperature control tank and automatically controlling a gas temperature of a gas blown to a temperature control tank from the relationship between the real temperature and a target temperature, thereby setting the particle to the target temperature. SOLUTION: The continuous powder particle temperature controller measures a real temperature of powder particles (m) to be discharged from a temperature control tank 3 by a real temperature sensor 5, sets a control output to a gas temperature regulator 8 to 50% when the measured real temperature coincides with a powder particle target temperature 150 deg.C set to a powder particle temperature regulator 6, and sets the gas temperature at this time to 200 deg.C. And, when the real temperature does not coincide with a set value, the controller sets a control output to the regulator 8 to 70% and sets the gas temperature to 220 deg.C. Thus, the controller automatically controls the real temperature to approach to the target temperature. Thus, an accurate high temperature required for the particles, short time, continuous heating or cooling can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous type of granular material for heating or cooling a granular material such as plastic pellets supplied to an injection molding machine for plastic or the like to a required temperature in a short time. It relates to a temperature control device.

[0002]

2. Description of the Related Art In an injection molding machine for plastics or the like, a granular material such as plastic pellets as a raw material to be supplied is required to have a certain temperature and a certain degree of dryness immediately before injection. The temperature and the degree of drying are, specifically, for plastics, the moisture content is several hundred to several ppm, and the temperature is about 100 ° C. to 160 ° C., but it depends on the type of the granular material, the molding method and the shape. In addition, the tolerances on variation for the defined temperature and dryness are quite stringent.

Further, when plastics, for example, PET (polyethylene terephthalate), which is a raw material for beverage bottles, is dried for a long time at the high temperature required immediately before injection as described above, a hydrolysis reaction occurs, and a product due to a decrease in molecular weight is produced. Problems such as a decrease in strength and a problem of odor remaining in a product due to generation of acetaldehyde occur. further,
If the high temperature state is continued, there is also a problem that the properties as a material deteriorate. Therefore, the high temperature state is required to be as short as possible. Further, it is generally difficult to control so as to simultaneously achieve two kinds of target values such as drying and heating.

[0004] For this reason, generally, first, the powder is dried at a low temperature state, that is, at a temperature of about 80 ° C to 140 ° C to a predetermined degree of drying, and is conveyed to a heating machine on an injection molding machine. A method is employed in which gas is sent to a heater and heated. Conventionally, in this case, most of the heaters were of a packed bed type. FIG. 6 is a schematic explanatory view of the overall configuration of an injection molding machine having such a conventional continuous powder heating machine.

This system comprises a dryer 120, a heater G, and an injection molding machine 130, and heats the powder m, which is a raw material for injection molding, to a predetermined degree of dryness and a preliminary temperature by the dryer 120. The gas at a predetermined temperature is blown into the heater G by the machine G, heated, and supplied to the injection molding machine 130. 101
Is a blower for blowing air for heating the granular material, 102 is a heater for heating the air, 103 is a heating tank for retaining and heating the granular material m, and 104 is from a reflux gas after heating. An exhaust filter 105 that collects suspended particles of the powder and the like is a powder and particle temperature measurement sensor that measures the temperature of the powder and the particle m heated and discharged by the heating gas and supplied to the injection molding machine 130.

The heater 102 has a heated gas temperature sensor 107 for measuring the temperature of the air heated by the heater 102.
And a heating gas temperature controller 108 for controlling the temperature of the heating gas to a constant temperature by the heater 102.
The feeder 111 supplies the dried granular material m from the dryer 120. In the case of such a heating machine G, since the heating gas at a constant temperature controlled to a preset value is blown into the heating tank 103 of the packed bed type, the temperature of the heated granular material is always desired. Temperature was difficult to maintain.

[0007] That is, the temperature of the granular material after heating includes the temperature and amount of the heated gas, the inlet temperature of the granular material, the amount of the granular material flowing through the temperature raising tank 103, in other words, the rise of the granular material. Hot water bath 103
It depends on the result of the equilibrium of the four conditions of the residence time within the chamber, but its control is difficult. This is because the inlet temperature and flow rate of the granular material cannot be controlled on the side of the heater G, and the temperature and amount of the heated gas must be controlled accordingly. There is a time delay in the control due to such a condition that there is a considerable amount of, and the time delay cannot keep up with changes in the inlet temperature and the through flow rate of the granular material.

[0008] This problem has been manifested in that, in particular, when the inlet temperature of the granular material supplied for heating changes, the change cannot be followed. In addition, in the case of the packed bed type, if the heating gas is blown in excessively, the granular material is blown away with the heating gas, so that the amount of the heated gas to be blown cannot be increased so much, and the residence time of the granular material is accordingly reduced. Must be designed long. For this reason, not only the size of the apparatus is increased, but also a problem caused by the above-described hydrolysis reaction or the like is caused.

[0009] The problem of the residence time is that when a continuous fluidized tank known mainly for drying is used as a temperature raising tank,
The heating time is shorter and can be solved. But,
In the conventional continuous fluidized tank, since drying is mainly performed, controlling the temperature of the discharged granular material to a constant level has not been considered much. In addition, since the unit of mass of the granular material to be heated is small, it is required that the temperature of the granular material be well controlled in terms of time.

Further, there is a problem of maintenance such as cleaning and replacement of the filter due to clogging of the exhaust filter. In addition, if one unit can perform not only heating but also cooling, there is no need to install another device for each application, and cost can be reduced.

[0011]

DISCLOSURE OF THE INVENTION The present invention has been proposed in view of the above problems, and it is only necessary to heat a granular material supplied to an injection molding machine such as a plastic to a desired temperature in a short time and accurately. It is an object of the present invention to provide a continuous granular material temperature control device which can be cooled without difficulty and has good maintainability.

[0012]

SUMMARY OF THE INVENTION The present invention focuses on the characteristic of a continuous fluidized tank, which has been conventionally recognized exclusively for drying, in that the control object is captured in small units and there is no local heating, and its temperature controllability is improved. By improving the properties, it is possible to make the most of its characteristics to enable accurate, high-temperature, short-time, continuous heating or cooling required for powders supplied to injection molding machines such as plastics. It was invented under the idea.

That is, in the continuous powder temperature control apparatus according to the first aspect, a gas at a predetermined temperature is blown into a temperature control tank into which the powder is continuously supplied and discharged, thereby forming a molding machine or the like. To control the temperature of the granules discharged and supplied to the tank, measure the actual temperature of the granules discharged from the temperature control tank, and, based on the relationship between the actual temperature and the target temperature, the gas blown into the temperature control tank. Is automatically controlled to bring the powder to the target temperature.

Here, the continuous type powder temperature control device is as follows.
After receiving the supply of the granular material continuously to the temperature control tank, catch the flow of the supplied granular material in small units, blow the gas at the predetermined temperature without interruption, and bring the granular material to the predetermined temperature. , Which is supplied to the post-process, and includes not only the case where the granular material is heated but also the case where it is cooled. The present invention is characterized in that the target temperature is realized by measuring the actual temperature of the granular material after the temperature control, feeding back the actual temperature, and automatically controlling the gas temperature. . The effect of the control effect is transmitted quickly because the flow of the granular material is captured in small quantities and the temperature is controlled without interruption. By using this point, automatic control is used to achieve temperature control with good tracking. is there.

According to a second aspect of the present invention, there is provided a continuous-type granular material temperature control device, wherein the basic data for temperature control is
The difference is that the gas temperature of the gas blown into the temperature control tank is also used. In this way, when the control determination is performed including the data on the inlet side of the control target, it is possible to cope with a case where the gas fluctuates before the predetermined gas temperature is reached,
Controllability is further improved.

According to a third aspect of the present invention, there is provided a continuous type granular material temperature control apparatus according to the first or second aspect, wherein:
It is a continuous fluidized tank. Since the fluidized tank is used, the granular material is caught as a flow in small units and is processed without interruption. The control air is uniformly distributed to the granular material, and local heating or cooling does not occur. The target temperature can be accurately achieved, and there is no unevenness.

According to a fourth aspect of the present invention, in the continuous granular material temperature control apparatus according to the third aspect, the continuous fluidized bed is a continuous fluidized bed of a multi-stage inclined floor type. The granules to be controlled are
Along the sloping floor, move sequentially to the multi-stage type higher temperature bath, the movement of the granular material is smooth, the temperature control effect is high, and only the last stage is discharged, Incompletely controlled powder and granules are not discharged and supplied to the next step.

According to a fifth aspect of the present invention, there is provided the continuous-type granular material temperature control apparatus according to any one of the first to fourth aspects, wherein the exhaust baffle for collecting non-gas components from the gas used for temperature control in the temperature control tank. Is provided. Here, the exhaust baffle means that among the suspended particles of the granular material contained in the used gas, relatively large particles are returned to the tank, and fine particles that have an adverse effect on the final product are discharged out of the tank together with the exhaust gas. It can be collected by an exhaust filter.

Therefore, with a general exhaust filter alone, relatively large suspended particles contained in the used gas are collected without distinction, so that clogging is liable to occur, cleaning and replacement are frequent, and there is a problem in maintainability. However, by using such an exhaust baffle together, clogging of the exhaust filter is reduced, and maintainability is improved.

According to a sixth aspect of the present invention, there is provided a continuous type granular material temperature control apparatus according to the first to fifth aspects, wherein a jacket for flowing a heat medium is provided outside the temperature control tank, and / or the temperature control tank is provided with a jacket. A tube through which a heat medium flows is provided. In addition to blowing gas at a predetermined temperature into the temperature control tank, a jacket for flowing the heat medium is provided on the outside, and a tube for flowing the heat medium is provided inside, so that the heat capacity of the temperature control tank increases, and The temperature control tank can be reduced in size with respect to the amount of the granular material, and the entire apparatus can be reduced in size.

The heating medium flowing through the jacket or the pipe can also be provided with appropriate temperature measuring means and temperature adjusting means.
It can control the temperature and can be used for both heating and cooling. The continuous powder and granular material temperature control device according to claim 7,
6. In 6, the apparatus has heating means for heating the gas blown into the temperature control tank, and / or has cooling means for cooling the gas blown into the temperature control tank, and heats and / or cools the granular material. It was made.

Originally, the concept of temperature control of the present invention is as follows:
In the case of heating, the case of cooling is also included, but in particular, the heating means and the cooling means are clearly specified to clarify that one or both of them can be performed. The continuous granular material temperature control device according to claim 8 is provided at a raw material supply port of an injection molding machine such as a plastic material according to claim 1, and has a predetermined temperature required for the injection molding machine. Is supplied continuously.

The continuous particle temperature control device of the present invention is characterized in that it can supply powder particles at a desired temperature in a short time and continuously. And the like, which constitutes the continuous powder temperature controller for injection molding machines.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic explanatory view showing the entire configuration of an example of the continuous powder temperature control apparatus of the present invention. In the continuous granular material temperature control device A, 1 is a blower for blowing the temperature controlling gas of the granular material m, 2 is a heater for setting the temperature controlling gas to a predetermined temperature, and 3 is a continuous flow of the granular material m. Control tank using a continuous fluidized tank for temperature control, 4 is an exhaust filter for collecting fine suspended particles of spent gas, 5 is powder particles discharged from the temperature control tank 3 and supplied to the next step An actual temperature sensor for measuring the actual temperature of the body m, 6 is a powder temperature controller for generating a temperature control signal of the powder based on the actual temperature measured by the actual temperature sensor, and 7 is for controlling the temperature of the powder m. A gas temperature sensor 8 for measuring the gas temperature of the gas, 8 is a gas temperature measured by the gas temperature sensor 7 and a powder temperature controller 6
Is a gas temperature controller that outputs a control signal to the heater 2 based on a signal from the heater 2.

Reference numeral 9 denotes a level meter for detecting the amount of the granular material m discharged from the temperature control tank 3 and supplied to the next process in the vicinity of the discharge portion. An inverter for switching the operation of the feeder between high and low speeds, a feeder 11 for supplying the granular material m to the temperature control tank 3, and an exhaust duct 12 for recirculating used air.

Here, the case where air is used as the temperature control gas will be described, but the present invention is not limited to this. Hereinafter, the temperature control tank 3 using the continuous fluidized tank will be described in detail. This temperature control tank 3 is a multi-stage type,
The tanks are partitioned by a partition plate 34 and a discharge block 35 to form four tanks, a first control tank 3a, a second control tank 3b, and a third tank.
It is divided into a control tank 3c and a discharge tank 3d. The fluidized bed 33 through which air for temperature control is passed and blown into the granular material is provided in a direction from the first control tank 3a to the third control tank 3c.
It is inclined in the direction of gravity.

The partition plate 34 is provided with a gap between the partition plate 34 and the fluidized bed 33. On the other hand, the lower part of the discharge bar 35 is a discharge damper 36 which can be opened and closed. The gap with the bed 33 is eliminated, and when opened, a large opening is formed between the bed and the fluidized bed 33. In addition, the upper part of the partition plate 34 has reached a position that is about half the height of the temperature control tank, but the upper part of the discharge bar 35 is at a lower position than that.

The inclined fluidized bed 33 is divided into air corresponding to the respective control tanks 3a to 3c, and is heated to a predetermined temperature by the heater 2 through an air outlet 31 provided with an air volume adjusting valve 32. Is sent to each control tank 3a.
The air for temperature control is blown into the granular material m in 3c. Next, a description will be given of a method of controlling the temperature of the powder using the continuous powder temperature controller A, that is, a method of heating or cooling. Here, the description will be made assuming that the granules have already been dried to an appropriate degree of drying in the previous step, and that the next step is directly connected to the continuous granule temperature controller A. It is not limited.

When the operation signal of the next step is OFF, that is, when the next step is stopped for some reason during the continuous operation of the next step and the control device A, the level meter 9 outputs a signal indicating that there is no particulate material. During feeding, the feeder 11 operates and supplies the powder m. On the other hand, if the level meter 9 sends out a signal indicating the presence of the granular material, the feeder 11 stops, and the supply of the granular material m is stopped. In this way, the excessive retention of the granules in the next step is prevented.

At this time, the set value of the gas temperature controller 8 is manually set to an appropriate value, and air for temperature control at a constant gas temperature is supplied. This is because in such an abnormal state, the function of temperature control is not fully exhibited,
This is because the temperature of the temperature control air is switched to a temperature that does not adversely affect the granules even if the air is heated for a long time, and the operation of the next process is to be restarted.

When the operation of the next step is ON, the feeder 11
Is operated, and the granular material m is continuously supplied to the temperature control tank 3,
From the temperature control tank 3, the powder m whose temperature is controlled is continuously discharged and supplied to the next step. In this case, when the level meter 9 is sending out a signal without particulates, the feeder 11 operates at a high speed by the action of the inverter 10, while if the level meter 9 sends out a signal with particulates, the feeder 11 is driven by the inverter. By operating at a low speed by the operation of 10, the supply amount of the granular material m is adjusted to maintain the amount of the granular material m retained in the temperature control tank 3 within a certain range.

The granular material m supplied into the temperature control tank 3 by the feeder 11 violently comes into contact with air for temperature control,
While forming a fluidized bed and exchanging heat with the air for temperature control, it floats in the control tanks 3a to 3c and sequentially moves with the first control tank 3a, the second control tank 3b, and the third control tank 3c. It is discharged from the discharge tank 3d. The granular material m is provided between the first control tank 3a and the second control tank 3b, the second control tank 3b and the third control tank 3c.
Between the fluidized bed 33 through the gap under the partition plate 34
Due to the action of the inclination, the control tank moves sequentially to the next control tank.

In this case, the granular material m floats in each of the control tanks 3a to 3c by receiving the air for temperature control whose air volume has been adjusted from the air outlet 31.
a, the air volume to the second control tank 3b is set to a low value, and the upper part of the partition plate 34 is also high, so that the granular material m passes over the upper part of the partition plate 34 and Does not move to the control tank or the discharge tank 3d.

On the other hand, the air flow to the third control tank 3c is set to a large value, and the upper part of the discharge bar 35 is set lower than the upper part of the partition plate 34. When the body m moves from the third control tank 3c to the discharge tank 3d, it moves over the discharge hole 35. In this manner, all the powders m are discharged after receiving predetermined temperature control uniformly in each of the control tanks 3a to 3c. Further, since the temperature control is divided into multiple stages, the control efficiency is high. In addition, since the granular material to be controlled becomes a fluidized bed and has a small volume unit, the control time is shortened, and the supply and discharge are continuously performed, so that the high temperature maintaining time is shortened. In addition, it is possible to avoid so-called shortcuts and abnormal stagnation, and it is also possible to avoid local heating and local cooling.

Further, by changing the height of the discharge bar 35, the amount of the powder particles retained in the temperature control tank 3 can be adjusted. Next, automatic temperature control which is a feature of the present invention will be described. In the continuous granular material temperature control device A, the actual temperature of the granular material m discharged from the temperature control tank 3 and the gas temperature of the temperature control air are measured, and the actual temperature, the gas temperature, and the granular material are measured. From the relationship with the target temperature, the gas temperature is automatically controlled to bring the powder to the target temperature. In this case, the control may be performed only at the actual temperature without using the gas temperature.

The set value of the gas temperature of the gas temperature controller 8 is:
Basically, it is determined by the deviation between the target temperature of the granular material set in the granular material temperature controller 6 and the measured value of the actual temperature sensor 5 using proportional control. FIG. 2 is a graph showing an example of such a temperature control. FIG. 2 shows that the target temperature 15
When the temperature of the air for temperature control is 0 ° C., the proportional band width is 100 ° C., and the output of the powder temperature controller 6 is 100%, the temperature set value of the air for temperature control is 250
This shows a case where the temperature set value at 150 ° C. and the output of the powder temperature controller 6 at 0% is set to 150 ° C.

As shown in FIG.
When the temperature matches 0 ° C., the control output to the gas temperature controller 8 is 5
The gas humidity at this time is set to 200 ° C. When the actual temperature does not match the set value, for example, when the actual temperature is 130 ° C. or lower than the target temperature, the control output to the gas temperature controller 8 becomes 70%, and the gas temperature is set to 220 ° C. When the actual temperature is 170 ° C. which is higher than the target temperature, the control output to the gas temperature controller 8 becomes 30%, the gas temperature is set to 180 ° C., and control is performed so that the actual temperature approaches the target temperature.

However, when the gas temperature is 200 ° C. and the temperature of the powder is not always 150 ° C., such a proportional control alone usually causes a residual deviation. I do. When the integral operation is added, the control output gradually changes at a speed corresponding to the deviation in the direction to eliminate the deviation while the deviation is occurring, that is, when the gas set temperature gradually changes and the deviation is eliminated Thus, there is no change in the control output due to the integration operation. Actually, the proportional control and the integration operation are performed simultaneously, and the sum of both control outputs is the control output.

In this manner, the setting of the gas temperature of the temperature control air is automatically performed so that the actual temperature of the granular material is equal to the target temperature of the artificial granular material. This automatic setting is repeatedly updated every 0.5 seconds. On the other hand, the gas temperature controller 8 performs the same control so that the gas temperature matches the gas set temperature.
However, in this case, the heater is directly driven by the control output.

In the case of the present invention, as described above, since the control object is a fluidized bed that can be captured in small units, the effect of such a setting change is immediately reflected on the actual temperature. Therefore, if this is set automatically and repeatedly as described above, the actual temperature is automatically controlled so as to reach the target temperature in a short time, and thereafter, the powder m at the target temperature is changed to the next temperature. It is continuously discharged and supplied to the process.

In this manner, during operation, the amount of the granular material m flowing through the temperature control tank 3 changes, or the temperature of the dried granular material m supplied to the temperature control tank 3 changes. Is changed, the set gas temperature of the gas temperature controller 8 is automatically corrected, and the granular material m discharged and supplied from the temperature control tank 3 to the next process is changed.
Is maintained at the target temperature in a short time, and stable and reliable temperature control can be performed without being affected by environmental changes.

Next, an exhaust baffle according to another feature of the present invention will be described. An exhaust unit 37 for exhausting used air used for temperature control and collecting suspended particles of the granular material is provided at an upper portion of the temperature control tank 3. The exhaust unit 37 has an exhaust baffle 38. And an exhaust port 39. The exhaust baffle 38 classifies and collects non-gaseous components contained in the used air, for example, suspended particles of a granular material using a trap or the like, and recycles large particles. Is made possible.

Therefore, the exhaust duct 1
The exhaust filter 4 for removing suspended particles and the like from the exhaust gas flowing through the blower 1 through the blower 2 does not immediately become clogged, and the number of times of cleaning and replacement is reduced, and maintainability is improved. In addition, since large particles are reused, they are also excellent in resource utilization. Next, another embodiment of the continuous granular material temperature control device of the present invention will be described. FIG.
It is a schematic explanatory view showing the whole composition of other examples of such a continuous type granular material temperature control device of the present invention.

The continuous granular material temperature control device B is shown in FIG.
Compared to the continuous powder temperature control device A, the only difference is that not only the heater of the heating means for heating the temperature control gas but also the cooling means for cooling the temperature control gas is provided. The same reference numerals are given to the common parts, and the overlapping description will be omitted. This continuous powder temperature control apparatus B is characterized in that a cooling coil 13 and a refrigerator 14 as a heat source thereof are further provided as cooling means for cooling the temperature control gas. The cooling means is exemplified by a cooling coil using a refrigerator or the like as a heat source, but is not limited to this. Further, in the continuous powder temperature control apparatus B, only the cooling means can be used without using the heater 2 as the heating means, or only the heating means is used like the continuous powder temperature control apparatus A. It can also be.

In the case where the cooling means is used, the gas temperature control is performed based on the relationship between the actual temperature of the granular material m discharged from the temperature control tank 3, the gas temperature of the temperature control air, and the target temperature, similarly to the heating means. And granular material m supplied from the drier using the oven 8
Is higher than the target temperature, the actual temperature can be lowered to the target temperature. Further, if the heating means and the cooling means are used in combination, it is possible to heat and cool the powder and granules as necessary by using a single continuous powder and grain temperature control device. In addition, there is no need to provide separate dedicated devices, so that installation space can be saved and costs can be reduced.

Next, still another embodiment of the continuous granular material temperature control device of the present invention will be described. FIG. 4 is a schematic explanatory view showing a main part configuration of another example of such a continuous powder temperature control apparatus of the present invention. Compared to the continuous powder temperature control apparatus A of FIG. 1, the continuous powder temperature control apparatus C not only blows a temperature control gas at a predetermined temperature into the temperature control tank 3 but also further outwards. Are different only in that a jacket for flowing the heat medium is provided therein, and a tube for flowing the heat medium therein is provided. Therefore, the same reference numerals are given to the other common parts, and redundant description will be omitted.

The jacket 15 has a hollow cylindrical shape provided so as to surround the outer circumference of the temperature control tank 3, and is hollow between the inner circumference and the outer circumference of the cylinder, such as water or air. Heat medium flows. The pipe 16 has a pipe shape extending inside the first to third control tanks 3 a to 3 c inside the temperature control tank 3, and allows a heat medium such as water or air to flow. A heat medium flows through the jacket 15 and the pipe 16 to assist temperature control by the temperature control air.

Both the jacket 15 and the pipe 16 may be provided, or only one of them may be provided. Also,
The temperature of the heat medium flowing through the jacket 15 and the pipe 16 can be controlled by providing appropriate temperature measuring means and temperature adjusting means, and can be used for both heating and cooling. Can be done. By doing so, the heat capacity of the temperature control tank increases, and the temperature control tank can be reduced in size with respect to the amount of the granular material to be controlled, and the entire apparatus can be reduced in size. Finally, an example of the continuous powder temperature control apparatus of the present invention used in an injection molding machine for plastics or the like in which the features of the present invention are best exhibited will be described. FIG. 5 is a schematic explanatory view showing the entire configuration of an example of an injection molding machine having such a continuous powder temperature control apparatus. Here, the case where it is used for plastic molding will be described.

In the figure, A is a continuous powder temperature controller of the present invention, 120 is a dryer, 130 is an injection molding machine, and the drying machine 120 and the injection molding machine 130 are shown in FIG. Is the same as described above. In this system, the continuous granular material temperature control device A is provided at a raw material input port of an injection molding machine 130, receives plastic pellets, which are raw materials of a plastic molded product, from a dryer 120, and continuously controls the temperature. Heat to the required temperature in time,
Discharge and supply to the plastic injection molding machine 130.

The plastic pellets are dried in a dryer 120 at a temperature of 80 ° C. to 150 ° C. over a period of about 2 to 4 hours to a moisture content of several hundreds to several tens ppm. And is supplied to the plastic injection molding machine 130. In the drying stage, it is desirable to perform the drying at as low a temperature as possible in order to prevent deterioration of the properties of the plastic. On the other hand, in the plastic injection molding machine 130, the plastic pellets are heated and melted and injected into the mold. For the same reason, it is desirable that the time be as short as possible. Therefore, it is desirable that plastic pellets that are stable at as high a temperature as possible are supplied to the molding machine 130. The continuous granular material temperature control device A of the present invention sufficiently satisfies such a demand.

[0051]

As can be understood from the above description, according to the continuous powder temperature control apparatus of the present invention as set forth in claims 1 to 8, the continuous fluidized tank recognized exclusively for drying. By focusing on the characteristics of the powder and improving its temperature controllability, utilizing the characteristics, the accuracy, high temperature, short time,
Enables continuous heating or cooling.

In particular, according to the continuous powder temperature control apparatus of the first aspect, a gas at a predetermined temperature is blown into a temperature control tank into which the powder is continuously supplied and discharged. It controls the temperature of the granules discharged and supplied to the machine, etc. It measures the actual temperature of the granules discharged from the temperature control tank and blows it into the temperature control tank based on the relationship between the actual temperature and the target temperature. Since the gas temperature of the gas is automatically controlled to keep the powder at the target temperature, the control unit is small and the temperature is controlled for each supply unit, so the control effect is transmitted quickly and that point is used. By performing automatic control, temperature control with good followability can be realized in a short time.
Further, since the high-temperature time is short, there is no problem caused by the above-mentioned hydrolysis reaction.

According to the continuous powder temperature control apparatus of the second aspect, in addition to the effect of the first aspect, the gas temperature of the gas blown into the temperature control tank is used as the basic data of the temperature control. Therefore, the control judgment is performed including the data on the inlet side of the controlled object, and it is possible to cope with a case where the gas fluctuates before the predetermined gas temperature is obtained. And controllability is further improved.

According to the continuous powder temperature control apparatus of the third aspect, in addition to the effect of the first or second aspect, since the continuous fluidized tank is used as the temperature control tank, the granular material is The processing is performed in an appropriate control unit, the control air is uniformly distributed to the granules, no local heating or cooling occurs, the target temperature can be accurately achieved in a short time, and there is no unevenness.

According to the continuous granular material temperature control device of the fourth aspect, in addition to the effect of the third aspect, the continuous fluidized tank is a multi-stage inclined-bed continuous fluidized vessel. The granular material to be controlled moves along the inclined floor to the multi-stage higher temperature part in order, and the movement of the granular material is smooth, the temperature control effect is high, and the final stage Is discharged, so that the incompletely controlled temperature is not discharged and supplied to the next step.

According to the fifth aspect of the present invention, in addition to the effects of the first to fourth aspects, in addition to the effects of the first to fourth aspects, non-gaseous components are removed from the gas used for temperature control in the temperature control tank. Since the exhaust baffle for collecting and reusing the exhaust gas is provided, the resources can be effectively used, the clogging of the exhaust filter is reduced, and the maintainability is improved. According to the continuous powder temperature control apparatus of the sixth aspect, in addition to the effects of the first to fifth aspects, a jacket for flowing a heat medium is provided outside the temperature control tank, and / or the temperature control is performed. Since the pipe through which the heat medium flows is provided inside the tank, the heat capacity of the temperature control tank is increased, and the temperature control tank can be reduced in size with respect to the amount of the granular material to be controlled. The size can be reduced.

According to the seventh aspect of the present invention, in addition to the effects of the first to sixth aspects, in addition to the effects of the first to sixth aspects, there is provided a heating means for heating the gas blown into the temperature control tank, and / or Since it has a cooling means for cooling the gas blown into the temperature control tank and heats and / or cools the granular material, the heating and / or cooling of the granular material is performed by one apparatus. As a result, the installation space can be saved and the cost can be reduced.

According to the continuous type powder temperature control apparatus of the eighth aspect, in addition to the effects of the first to seventh aspects, the apparatus is installed at a material supply port of an injection molding machine such as a plastic, and is required for the injection molding machine. Since the powdery material at a predetermined temperature is continuously supplied, it is suitable for an injection molding machine for plastics or the like which requires a continuous, stable and high temperature supply for a short time.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing an entire configuration of an example of a continuous powder temperature control apparatus of the present invention.

FIG. 2 is a graph showing an example of temperature control in the continuous powder temperature control apparatus of the present invention.

FIG. 3 is a schematic explanatory view showing the overall configuration of another example of the continuous powder temperature control apparatus of the present invention.

FIG. 4 is a schematic explanatory view showing a main part configuration of another example of the continuous powder temperature control apparatus of the present invention.

FIG. 5 is a schematic explanatory view showing an entire configuration of an example of an injection molding machine having a continuous powder temperature control apparatus of the present invention.

FIG. 6 is a schematic explanatory view showing the entire configuration of an injection molding machine having a conventional continuous powder heating machine.

[Explanation of symbols]

 A, B, C Continuous particle temperature controller m Powder 1 Blower 2 Heater 3 Temperature control tank 4 Exhaust filter 5 Actual temperature sensor 6 Powder temperature controller 7 Gas temperature sensor 8 Gas temperature controller 13 Cooling coil 14 Refrigerator 15 Jacket 16 Pipe 31 Blow port 32 Air volume control valve 33 Fluidized bed 38 Exhaust baffle 120 Dryer 130 Injection molding machine

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B29C 45/78 B29C 45/78 F26B 17/14 F26B 17/14 Z (72) Inventor Nobuyoshi Kanazawa 2 Yoshinodai, Kawagoe-shi, Saitama No. 8-68 Matsui Manufacturing Co., Ltd. Tokyo factory (72) Inventor Tsutomu Ohno 1-10-4 Nagao Furniture Town, Hirakata City, Osaka Prefecture Matsui Manufacturing Co., Ltd.Technical Development Center (72) Inventor Osamu Matsui Osaka Osaka 6-5-26 Tanimachi, Chuo-ku, Yokohama-shi Matsui Manufacturing Co., Ltd.

Claims (8)

[Claims] 1. A continuous powder for controlling the temperature of a granular material discharged and supplied to a molding machine or the like by blowing a gas at a predetermined temperature into a temperature control tank into which the granular material is continuously supplied and discharged. A granule temperature control device, which measures the actual temperature of the powder and granules discharged from the temperature control tank, and automatically determines the gas temperature of the gas blown into the temperature control tank from the relationship between the actual temperature and the target temperature. A continuous granular material temperature control device that controls the granular material to reach the target temperature. 2. A method of blowing a gas at a predetermined temperature into a temperature control tank in which a powder is continuously supplied and discharged to reduce the temperature of the powder discharged and supplied to a molding machine or the like. This is a continuous powder temperature controller for controlling the temperature of the powder, which measures the actual temperature of the powder discharged from the temperature control tank and the gas temperature of the gas blown into the temperature control tank. In view of the above, a continuous granular material temperature control device that automatically controls the gas temperature to bring the granular material to the target temperature. 3. The temperature control device according to claim 1, wherein the temperature control tank is a continuous fluidized tank. 4. The method according to claim 3, wherein the continuous fluidized bed comprises:
A continuous powder temperature controller that is a multi-stage inclined-bed continuous fluidized tank. 5. The continuous granular material temperature control apparatus according to claim 1, wherein an exhaust baffle for collecting non-gas components from gas used for temperature control is provided in said temperature control tank. 6. The method according to claim 1, wherein a jacket for flowing a heat medium is provided outside the temperature control tank, and / or
A continuous granular material temperature control device provided with a pipe for flowing a heat medium inside the temperature control tank. 7. The method according to claim 1, further comprising heating means for heating the gas blown into said temperature control tank, and / or cooling means for cooling the gas blown into said temperature control tank. A continuous powder temperature controller for heating and / or cooling the body. 8. The method according to claim 1, wherein the continuous powder temperature control device is installed at a raw material supply port of an injection molding machine made of plastic or the like and has a predetermined temperature required for the injection molding machine. Continuous granule temperature control device that continuously supplies water.