JPS6311050B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a temperature control method and a temperature control device for a kneader that requires temperature control.

[Prior Art] Generally, closed kneading machines for kneading rubber, etc., have a mechanism that controls the temperature of the kneading tank by supplying cooling water to the jacket of the kneading machine in order to suppress heat generation of the kneaded materials during kneading. is provided.

In the rubber kneading operation using the above conventional kneading machine,
The temperature of the kneading tank at the start of kneading is the temperature of the refrigerant supplied to the jacket, and the rubber material to be kneaded is put into this kneading tank.

The rubber material that is introduced has various properties such as lumps, powders, and liquids, but it is first crushed by the kneading rotor and the wall of the kneading tank, and then gradually transformed into lumps while being uniformly dispersed. The mixture forms a highly viscous kneaded rubber. In this kneading state (initial kneading), if the temperature of the kneading tank is too low, it will take time to form a lump.

The rubber clumped together in the kneading tank is further subjected to a kneading action (main kneading), which promotes homogeneous dispersion of the kneaded material, but in this process the material rapidly generates heat, and this heat generation causes the kneading Since there is a risk that the material may deteriorate, it is necessary to supply a low-temperature refrigerant to the jacket of the kneading tank to suppress heat generation of the material. Incidentally, the temperature rise of the kneaded material is also a parameter of the kneaded state.

After further kneading (final kneading), when the temperature determined by the kneaded materials is reached, the kneaded rubber mass is discharged outside the tank, but the kneading tank is continuously cooled by the refrigerant supplied to the jacket. Since it has been
As a result of this cooling, the kneading tank, which has been emptied after the rubber mass has been discharged, is rapidly cooled down, often resulting in dew condensation. Such condensation in the kneading tank causes the mixing of water into the kneaded materials and the accompanying slippage of the kneading rotor, which prolongs the kneading time, resulting in poor quality of the kneaded materials and a decrease in the production volume per hour. I will do it.

However, the temperature control conventionally adopted by supplying refrigerant to the jacket of a kneading machine is a constant temperature control using only either low-temperature water or high-temperature water. Not only does it take a long time, but it may also cause condensation in the kneading tank, and constant temperature control using high-temperature water may not be able to sufficiently suppress the heat generated as kneading progresses. However, there were drawbacks such as poor quality of the kneaded materials and a decrease in production due to the extended kneading time.

[Problems to be solved by the invention] The present invention solves the problem by adding medium-temperature water to low-temperature water and high-temperature water.
Using refrigerants of different temperatures, these refrigerants are switched at each set time set corresponding to the kneading operation of the kneading materials, or at each set temperature set corresponding to the temperature change inside the kneader. The kneading machine is heated or cooled appropriately according to the kneading state of the kneaded materials by supplying the kneaded material to the jacket of the kneaded material. The problem to be solved is to prevent a drop in production due to the extension.

[Means for Solving the Problems] The present invention provides refrigerants at three different temperatures, including low-temperature water, medium-temperature water, and high-temperature water, at preset times corresponding to the kneading operation of kneaded materials, or Using a method of supplying water to the jacket of the kneading machine by switching the set temperature according to the temperature change inside the kneading machine, the water is supplied to the jacket of the kneading machine. The kneading machine is equipped with a heater for heating water, a refrigerator for cooling the water in the low-temperature water tank, and a supply pipe connecting each of the tanks and the jacket of the kneading machine, and water is supplied from each tank to the jacket of the kneading machine. This is done by opening and closing a solenoid valve installed in the supply pipeline using a timer whose time is set in accordance with the kneading operation of the kneading materials, or by setting the temperature in accordance with temperature changes inside the kneading machine. This is done by opening and closing with a temperature control switch, thus solving the above problem.

[Operation] In the kneading machine equipped with the above-described temperature control device of the present invention, a refrigerant at a temperature suitable for the initial stage of kneading is supplied to the jacket to knead the kneaded materials. When the time set corresponding to the kneading operation of the kneaded materials has elapsed, or when the temperature inside the kneader reaches the set temperature due to kneading of the kneaded materials, the first refrigerant supply is stopped and the next kneading operation is started. Supply refrigerant at the appropriate temperature and continue kneading.

Thereafter, this operation is repeated every time the time set corresponding to the kneading operation of the kneaded materials elapses, and every time the set temperature set corresponding to the temperature change inside the kneading machine is reached, the kneading is completed.

[Embodiment] FIG. 1 shows a flow diagram of an embodiment of the first invention, in which water from a water source is supplied to a medium-temperature water tank W via a dispenser D. In this case, when the high temperature water tank H and the low temperature water tank C are empty or do not store a predetermined amount of water, the electromagnetic valves 8 and 9 are opened by the liquid level detection switches LC1 and LC3.

The dispenser D is filled with sodium phosphate, which flows into the water from the water source at a concentration of 2 ppm or less to prevent rust and scale from adhering to the system.

When the medium-temperature water tank W reaches a predetermined liquid level by water supply from the water source, the pump P2 is activated by the liquid level detection switch LC2 that detects the liquid level.
Water in the medium-temperature water tank W is supplied to the high-temperature water tank H and the low-temperature water tank C through the above-mentioned open electromagnetic valves 8 and 9. When the water in the high-temperature water tank H and the low-temperature water tank C reaches a predetermined level, the solenoid valves 8 and 9 are closed by the liquid level detection switches LC1 and LC3 that have detected the liquid level. H,
The supply of water to low-temperature water tank C is stopped, and a predetermined amount of water is stored in tanks H and C.

By closing the above-mentioned solenoid valves 8 and 9, the pump P2
As the discharge pressure increases, the pressure detection switch PS2 detects this pressure increase and stops the pump P2, and at the same time stops the water supply to the medium temperature water tank W by appropriate means.

The temperature of the water supplied to the high-temperature water tank H is detected by a temperature control switch TC2, and when the temperature is below a predetermined temperature of the high-temperature water tank H, the temperature control switch TC2 closes the circulation pipe of the high-temperature water tank H. On the other hand, the liquid level detection switch LC1 closes the solenoid valve 8 and starts the pump P1 at the same time, so that the high temperature water tank H
The water is circulated through the circulation pipe 11 by the pump P1. The temperature of the water circulating in this circulation pipe 11 is
When the temperature is detected by the temperature control switch TC1 and is below the predetermined temperature of the high temperature water tank H,
The heater 15 is energized to heat the water circulating through the circulation pipe 11. When the circulating water is heated to a predetermined temperature of 35 to 60°C in the high-temperature water tank H, the solenoid valve 7 is activated by the temperature control switch TC2 that detects this temperature.
is closed, the discharge pressure of the pump P1 increases, and the pressure detection switch PS1 detects this pressure increase and stops the pump P1. Further, since the water temperature in the circulation pipe 11 increases due to the stop of circulation in the circulation pipe 11, the temperature control switch TC1 cuts off the power supply to the heater 15, and heating of the high-temperature water ends.

On the other hand, the temperature of the water supplied to the low temperature water tank C is detected by the temperature control switch TC3,
When the water temperature is higher than the predetermined temperature of the low temperature water tank C, the temperature control switch TC3
is activated to cool the water in the low temperature water tank C. 10~ when the water in low temperature water tank C is at the specified temperature
When the temperature is cooled to 20° C., the temperature control switch TC3 detecting this temperature stops the refrigerator 16, and cooling of the low-temperature water ends.

high-temperature water brought to a predetermined temperature as described above;
Medium-temperature water and low-temperature water are supplied through solenoid valves 1, 2,
3 is supplied to the jacket of the kneading tank 18 by opening and closing the timers T1, T2, and T3 at set times corresponding to the kneading operations of the kneading materials. As a result, the refrigerant that has heated or cooled the kneading tank 18 is used to control the solenoid valves 4, 5, and 6 provided in the reflux pipe line 13 through temperature control switches TC4 and TC5 that operate according to the temperature of the reflux water. , TC6, the water is returned to each tank.

The above embodiment will be described below with reference to the case where the rubber shown in FIG. 3 is kneaded.

In the rubber kneading shown in Figure 3, the time required for one kneading cycle (usually 6 to 15 minutes, rarely 20 to 30 minutes)
I have something to say. ), depending on the kneading operation in
In advance, timer T1 and timer T2 are set to operate sequentially at an interval of approximately 1/6 of one kneading cycle, timer T3 is activated at an interval of a little less than 1/2 of one kneading cycle, and timer T2 is activated sequentially at an interval of approximately 1/6 of one kneading cycle. , set the operating time of each timer.

First, when the timer T1 is started and the solenoid valve 1 is opened, the pressure detection switch PS1 detects a decrease in the discharge pressure and starts the pump PS1.
High-temperature water in the high-temperature water tank H is supplied to the jacket of the kneading tank 18 through the supply pipe 12, and the kneading tank 1
Heat 8. The high-temperature water whose temperature has been lowered by heating the kneading tank 18 is returned to the high-temperature water tank H through the solenoid valve 4 in the return pipe 13, which is opened by the temperature control switch TC4. In this case, solenoid valves 5 and 6 are closed by temperature control switches TC5 and TC6.

While the kneading machine 17 is being heated by the high-temperature water, as shown in FIG. 3, the material to be kneaded is charged into the kneading machine 17 and initial kneading is performed.

When the timer T1 stops as the set time elapses, the timer T2 is started at the same time. When the timer T1 stops and the solenoid valve 1 is closed, the supply of high-temperature water is stopped, and the resulting pump P
The pressure detection switch PS1 detects an increase in the discharge pressure of the pump P1, and the pump P1 is stopped. On the other hand, since the solenoid valve 2 is opened by starting the timer T2,
As in the case of high-temperature water, pump P2 is started by pressure detection switch PS2, and medium-temperature water tank W is activated.
Medium-temperature water is supplied to the jacket of the kneading tank 18. The reflux pipe 1 passes through the jacket of the kneading tank 18.
Since the temperature of the medium-temperature water that is recirculated is lower than that of the high-temperature water, the temperature control switch TC4 closes the solenoid valve 4, and the temperature control switch TC5 opens the solenoid valve 5, so that the medium-temperature water is returned to the medium-temperature water tank W. be done. As long as medium-temperature water is being supplied, initial kneading continues, as shown in FIG.

At the end of the initial kneading, the timer T2 is stopped after the set time has elapsed, and at the same time, the timer T3 is started. The supply of medium-temperature water and the operation of pump P2 are stopped by stopping timer T2, as in the case of high-temperature water described above.
When activated, the solenoid valve 3 is opened, and the low temperature water in the low temperature water tank C is supplied to the jacket of the kneading tank 18. The temperature of the low-temperature water that cools the kneading tank 18 and flows back through the reflux pipe 13 is lower than that of medium-temperature water, so that the temperature control switch TC5 is activated by the solenoid valve 5.
Temperature control switch TC6 closes solenoid valve 6.
Since the water is opened, the water is refluxed to the low-temperature water tank C.

While low-temperature water is being supplied to the jacket of the kneading tank 18, main kneading is being carried out as shown in FIG.
Since the kneading tank 8 is cooled by low-temperature water, the temperature of the kneading tank 18 is prevented from rising abnormally.

When the timer T3 stops after the set time has elapsed during the completion of the main kneading and the subsequent final kneading,
At the same time, the timer T2 is restarted, the supply of low-temperature water to the jacket of the kneading tank 18 is stopped, and medium-temperature water is supplied again. The temperature control switch TC6 closes the solenoid valve 6, and the temperature control switch TC5 opens the solenoid valve 6, depending on the temperature difference between the medium-temperature water and the low-temperature water supplied to the kneading tank 18 again. It is refluxed to tank W. While the medium temperature water is being supplied to the jacket of the kneading tank, the temperature in the kneading tank 18 decreases as the final stage of kneading is completed and the kneaded rubber is discharged from the kneader 17, but the temperature in the kneading tank 18 decreases. Because the refrigerant is medium-temperature water, the temperature of the kneading tank 18 does not drop suddenly.
8 is prevented from condensing.

When one kneading cycle is completed by discharging the kneaded rubber from the kneader 17, the timer T1 is started again and the next kneading is started.

FIG. 2 shows a flow diagram of an embodiment of the second invention, and this embodiment uses timers T1, T2, and T3 in the embodiment of the first invention to correspond to temperature changes inside the kneading tank 18. Temperature control switch TC7, TC8, which operates at the set temperature
The solenoid valves 7, 8, and 9 are opened and closed by the TC9.

An embodiment of the second invention will be briefly described with reference to the case where the rubber shown in FIGS. 3 and 4 is kneaded.

As shown in FIG. 4, the temperature control switch TC7 opens the solenoid valve 1 when it detects that the temperature inside the kneading tank 18 has reached approximately 55°C, and as in the embodiment of the first invention, Supply high temperature water to the jacket.
When the temperature inside the tank rises to about 60℃ during initial kneading, temperature control switch TC7 closes solenoid valve 1, temperature control switch TC8 opens solenoid valve 2, and the supply of high-temperature water is stopped. Hot water is supplied to the jacket. When the temperature inside the kneading tank 18 rises to about 62°C, the temperature control switch TC8 closes the solenoid valve 2, and the temperature control switch TC9 opens the solenoid valve 3, so the supply of medium-hot water is stopped and the low-temperature water is turned off. is supplied to the jacket.

When the temperature inside the kneading tank rises to about 100°C due to the end of main kneading and the subsequent final kneading, temperature control switch TC8 closes solenoid valve 2, and temperature control switch TC8 reopens solenoid valve 2. Therefore, the supply of low-temperature water is stopped and medium-temperature water is supplied to the jacket again.

When the temperature inside the kneading tank 18 decreases due to the discharge of the kneading material and reaches the initial temperature of one kneading cycle,
Temperature control switch TC7 opens solenoid valve 1,
The kneading cycle is then started.

The other points of the embodiment of the second invention are similar to the embodiment of the first invention, so detailed explanation will be omitted. In addition,
In FIG. 4, the solid line indicates the temperature change in the kneading tank 18 due to conventional constant temperature control of low-temperature water.

In the above two embodiments, the high temperature water whose temperature has been lowered by heating in the kneading tank 18 is controlled by temperature control switches TC2 and TC1 while medium temperature water and low temperature water are being supplied to the jacket. is detected and heated in the same manner as the initial heating of water in the high-temperature water tank H, and the temperature is raised to a predetermined temperature until the next supply to the jacket. Also, the kneading tank 18
The low-temperature water whose temperature has increased due to cooling is also cooled by the refrigerator while medium- and high-temperature water is being supplied to the jacket, and is brought to a predetermined temperature before being supplied to the next jacket. cooled down.

Generally, the time required for low-temperature water when kneading rubber is 1/2 of the time required for one kneading cycle.
Because it is weak, the low-temperature water supply equipment only needs to be about 1/2 of the equipment required for the conventional constant temperature control method using low-temperature water.
In addition, the time required for high-temperature water is about 1/6 of the time required for one kneading cycle, so high-temperature water equipment also requires
It can be made smaller than the device required for a conventional constant temperature control device using high temperature water.

For example, a system that requires water flow of 10 t/h is equipped with three pumps with a water delivery capacity of 180 per minute, a high temperature water tank H of 400, a medium temperature water tank W of 800, and a low temperature water tank C of 1000. . When a 12-minute cycle of kneading operation is performed in this device, the high-temperature water in the high-temperature water tank H circulates once in about 2 minutes and switches to medium-temperature water, and after about 1/2 of the medium-temperature water is supplied, the high-temperature water is turned into low-temperature water. After switching to water, the low-temperature water is circulated once in a little less than 6 minutes, and the remaining 1/2 medium-hot water from the medium-hot water tank W is
2 is supplied.

Therefore, the high-temperature water in the high-temperature water tank H that has been circulated once only needs to be heated to the set temperature within about 10 minutes after the supply is finished, so the capacity of the heater can be reduced. On the other hand, since the low-temperature water in the low-temperature water tank C also remains for 6 minutes after the supply ends, the amount of heat that has increased during the supply only needs to be cooled down in the refrigerator in 6 minutes after the supply ends, so the capacity of the refrigerator can also be reduced. can do.

In addition, in the above-mentioned rubber kneading, medium-temperature water is supplied between the supply of high-temperature water and the supply of low-temperature water, so that high-temperature water and low-temperature water do not mix directly.
Since extreme temperature fluctuations of high-temperature water and low-temperature water do not occur, the capacity of the heater and refrigerator can be further reduced compared to conventional constant temperature control methods.

Furthermore, as shown in FIG. 4, compared to, for example, the conventional constant temperature control method using low-temperature water, there is no extreme drop in the temperature inside the kneading tank 18 due to material discharge, so the initial kneading time is shortened and the kneading process is improved. The time required for this can be reduced.

[Effect of the invention] The first to fourth inventions have low temperature water, medium temperature water,
A refrigerant of three types of temperatures consisting of high-temperature water is used at set times corresponding to the kneading operation of the kneaded materials.
Alternatively, since the kneading machine is supplied to the jacket of the kneading machine by switching the set temperature according to the temperature change inside the kneading machine, it is necessary to supply the kneading material to the kneading state of the kneading material or the temperature change caused by this. The kneading tank can be kept at the appropriate temperature for the kneading operation by supplying a refrigerant at the same temperature, thereby preventing quality defects in the kneaded materials caused by insufficient cooling of the kneaded materials or condensation inside the kneading machine, as well as the kneading operations. It is possible to prevent a decrease in the production amount per hour due to delays in production.

In addition, especially in the second and fourth inventions, since the supply of refrigerant is switched in response to temperature changes inside the kneading machine that change depending on the kneading state of the kneaded materials, the time for each kneading operation may change for some reason. This change can be accommodated in any case.

[Brief explanation of the drawing]

Fig. 1 is a flow diagram of the embodiment of the first invention and the third invention, Fig. 2 is a flow diagram of the embodiment of the second invention, and Fig. 3 shows the rubber kneading operation and the supply time of refrigerant at each temperature. FIG. 4 is a diagram showing the relationship between kneading time and temperature change in the kneading tank when the second invention is applied to kneading rubber. 1, 2, 3, 7, 8, 9... solenoid valve, 12...
Supply pipe line, 15... Heater, 16... Refrigerator, 1
7...Kneading tank, H...High temperature water tank, W...Medium temperature water tank, C...Low temperature water tank, T1, T2, T
3...Timer, TC7, TC8, TC9...Temperature control switch.

Claims (1)

[Scope of Claims] 1. The jacket of the kneader is switched between three types of refrigerants, consisting of low temperature water, medium temperature water, and high temperature water, at set time intervals corresponding to the kneading operation of kneading materials. A method for controlling the temperature of a kneading machine, characterized in that the temperature is supplied to a kneading machine. 2. Three types of refrigerant, consisting of low-temperature water, medium-temperature water, and high-temperature water, can be switched to the jacket of the kneader by switching the refrigerant at each set temperature corresponding to the temperature change inside the kneader. Characteristic temperature control method of kneading machine. 3. A low-temperature water tank, a medium-temperature water tank, a high-temperature water tank, a heater that heats the water in the high-temperature water tank, a refrigerator that cools the water in the low-temperature water tank, and communication between each of the above tanks and the jacket of the kneading machine. Water is supplied from each tank to the jacket by opening and closing a solenoid valve provided in the supply pipe using a timer set in accordance with the kneading operation of the kneaded materials. A temperature control device for a kneading machine characterized by: 4. A low-temperature water tank, a medium-temperature water tank, a high-temperature water tank, a heater that heats the water in the high-temperature water tank, a refrigerator that cools the water in the low-temperature water tank, and communication between each of the tanks and the jacket of the kneading machine. Water is supplied from each tank to the jacket by opening and closing a solenoid valve provided in the supply pipe using a temperature control switch whose temperature is set in accordance with temperature changes inside the kneading machine. A temperature control device for a kneader, characterized in that temperature control is performed by a kneading machine.