JP3655062B2 - Kneading control method of closed type kneader - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a kneading control method for a closed kneading apparatus that obtains a kneaded product of a predetermined quality by kneading while cooling and pressurizing.
[0002]
[Prior art]
In a batch type closed kneader, kneading materials such as rubber and plastic are usually kneaded by a rotor provided in the kneading chamber while being pressed into the kneading chamber by the pressure of a ram. And when it becomes the kneaded material of the desired kneading | mixing state, the kneaded material for 1 batch is manufactured by a series of operation | movement of discharging this kneaded material outside from a kneading chamber through a drop door. .
[0003]
By the way, the same kind of kneaded material satisfies the product specifications corresponding to each kind when one batch is manufactured, but the smaller the variation in quality between batches, the later Since quality control and manufacturing conditions in the process become easy, it is desirable to manufacture with a certain quality.
[0004]
Thus, various methods for producing a kneaded material with a constant quality have been proposed and implemented conventionally. For example, Japanese Patent Publication No. Sho 62-26284 continuously detects the temperature of the kneaded material during kneading, A method is disclosed in which the ram pressure is changed after a predetermined time has elapsed since the rate of increase in the detected temperature has reached the maximum value. Japanese Patent Publication No. 3-80604 discloses a method of controlling at least one of the rotational speed of the rotor and the pressure of the ram so that the detected temperature of the kneaded material becomes a target value based on the specific energy supply amount. Yes.
[0005]
[Problems to be solved by the invention]
However, the above conventional method has been made by paying attention to the fact that the rate of temperature increase and the specific energy supply amount have relevance to the physical properties of the kneaded product, and therefore the range of this relevance is limited. Beyond that, the physical properties of the kneaded product cannot be controlled, and as a result, it is extremely difficult to stably obtain a kneaded product of a predetermined quality.
[0006]
Therefore, the present invention is intended to provide a kneading control method for a closed kneading apparatus that can control the physical properties of the kneaded material with high accuracy and can obtain a high-quality kneaded material more stably. is there.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention of claim 1 is a kneading control method of a closed kneading apparatus that obtains a kneaded material of a predetermined quality by kneading while cooling and pressurizing, and kneading from the start of kneading of the kneaded material From the start of kneading to the end of kneading of the above-mentioned closed kneading apparatus after determining as a preset temperature a value corresponding to a series of temperature changes of the kneaded product up to the end and a value at which the kneaded product has a predetermined quality The control element directly related to the physical properties of the kneaded product is controlled from the start of kneading to the end of kneading so that the temperature of the kneaded product is detected and the detected temperature of the kneaded product follows the set temperature . It is characterized by kneading while repeatedly controlling.
As a result, the temperature and set temperature of the kneaded material used when obtaining a kneaded material of a predetermined quality, and the control elements are directly related to the physical properties of the kneaded material, so that it is indirectly related to the physical properties of the kneaded material as in the past. It is possible to control the physical properties of the kneaded material with higher accuracy than when the kneaded material is obtained using the temperature increase rate and the specific energy supply amount, and as a result, a kneaded material of a predetermined quality can be stably obtained. Can do.
[0008]
The invention of claim 2 is the kneading control method of the closed kneading apparatus according to claim 1, wherein the control elements are composed of cooling, pressurization and kneading, and these control elements are controlled independently. It is characterized by.
Thus, by independently controlling the three control elements consisting of cooling, pressurization, and kneading, the temperature followability of the kneaded product with respect to the set temperature can be improved, so that the physical properties of the kneaded product are further improved. It becomes possible to control with high accuracy, and as a result, a kneaded product of a predetermined quality can be obtained more stably.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
As shown in FIG. 1, the closed kneading apparatus that performs kneading by the kneading control method according to the present embodiment includes a case member 3 including a chamber 6 having a longitudinal cross-sectional shape for accommodating the kneaded material 4, and the case member 3. And a pair of rotors 1 and 2 that knead the kneaded material 4 while stirring and shearing. A drive motor 17 is connected to the rotors 1 and 2 via a speed reduction mechanism (not shown), and the drive motor 17 rotates the rotors 1 and 2 in opposite directions via the speed reduction mechanism.
[0010]
A cooling hole 5 is machined in the case member 3 supporting the rotors 1 and 2, and a cooling pipe is joined via the case member 3 so as to cool the kneaded material 4. The cooling hole 5 is connected to a cooling water supply system 12 for supplying and collecting cooling water and circulating it. The cooling water supply system 12 is also connected to the rotors 1 and 2 described above, and the kneaded material 4 is cooled via the rotors 1 and 2. The cooling water supply system 12 has a cooling water adjustment valve 14 capable of adjusting the cooling water supply amount, and controls the cooling capacity of the cooling pipe 5 and the rotors 1 and 2 by adjusting the cooling water supply amount. It is possible.
[0011]
On the other hand, a ram 7 for press-fitting a kneaded material such as rubber or plastic and the kneaded material 4 into the chamber 6 is provided at the upper central portion of the case member 3 so as to be movable up and down. The ram 7 is provided in an elevating cylinder 8, and a pressure air supply system 9 that supplies pressure air is connected to the elevating cylinder 8. The pressure air supply system 9 has a pressure adjustment valve 10 capable of adjusting the supply pressure of the pressure air, and is configured to raise and lower the ram 7 with respect to the lift cylinder 8 and to adjust the supply pressure. Thus, the pressure of the ram 7 can be controlled via the lifting cylinder 8.
[0012]
In addition, a drop door 16 for discharging the kneaded material to the outside is provided in the lower center portion of the chamber 6. The drop door 16 is provided with a temperature detector 19 for detecting the temperature of the kneaded material 4, and the temperature detector 19 is connected to the input / output unit 21 of the control device 20. In addition to the temperature detector 19, the input / output unit 21 is connected to the drive motor 17, the cooling water adjustment valve 14, and the pressure adjustment valve 10, and receives the temperature detection signal input from the temperature detector 19. The control signal is converted into a signal form suitable for signal processing in the control device 20 and fetched, while the control signal is converted into a signal form suitable for driving each of the devices 17, 14, 10 and output.
[0013]
The input / output unit 21 is connected to a CPU unit 23, a key input unit 24, a display unit 25, a storage unit 26, and a recording unit 27 via a signal bus 22. The key input unit 24 includes a keyboard, setting switches, and the like so as to input various data such as kneading conditions, and the display unit 25 displays various data and graphs indicating kneading conditions and kneading states on the screen. As described above, an LCD device and a CRT device are provided. In addition, the storage unit 26 stores a kneading control routine executed by the CPU 23, and a temperature master curve area 26a and a control parameter area 26b are formed. In each of the areas 26a and 26b, the lot of the current lot is stored. A set temperature, parameters, etc. used during kneading are stored. The recording unit 27 includes a large-capacity recording device such as a hard disk device, and records various kneading data such as set temperatures and parameters corresponding to each product type. The set temperature is a temperature corresponding to a series of temperature changes during kneading at which the kneaded product 4 has a predetermined quality. If the kneaded product 4 is created at this set temperature, the kneaded product 4 having a predetermined quality is always obtained. Means the temperature at which can be obtained.
[0014]
In the above configuration, a kneading control method will be described based on the operation of the closed kneading apparatus.
When the CPU 23 executes the kneading control routine shown in FIG. A screen for accepting batch data such as the product type and the processing amount is displayed on the display unit 25 (S1). When the operator operates the key input unit 24 to key in batch data, the product data in the batch data and the product data in the recording unit 27 are matched to obtain kneading data corresponding to the keyed product type. It is determined whether or not it is recorded in the recording unit 27 (S2).
[0015]
If the same product type data is recorded (S2, YES), kneading data corresponding to this product type data is read out. That is, a series of set temperatures T0 from the start to the end of kneading, a rotor speed parameter used for controlling the rotational speed of the drive motor 17, and a ram pressure parameter used for controlling the pressure air supply pressure The temperature adjustment parameters used for controlling the cooling water supply amount are read as kneading data, and these kneading data are stored in the temperature master curve area 26 a and the control parameter area 26 b of the storage unit 26. Each parameter is composed of proportional coefficients Kp1, Kp2, Kp3, integration times Ti1, Ti2, Ti3, and differentiation times Td1, Td2, Td3 (S3). Thereafter, the read kneading data is displayed on the display unit 25 to allow the operator to confirm the kneading data so that the kneading data is optimal for the kneading conditions of the current lot (S4).
[0016]
On the other hand, if the same product type data is not recorded in S2 (S2, NO), the key input of the key input unit 24 is made acceptable, and the operator inputs the kneading data (S5). ). When kneading data for the current lot is set in this way, it is determined whether or not the start of kneading has been instructed by operating the key input unit 24 (S6), and if not instructed (S6, NO) ), The execution of S6 is repeated to enter a standby state. Thereafter, when the introduction of the kneading material is completed and the start of kneading is instructed (S6, YES), the base data including the base rotation speed Vb, the base pressure Pb, and the base flow rate Qb in the kneading data is obtained. The base data is read out, and these base data are output to the drive motor 17, the pressure adjustment valve 10 and the cooling water adjustment valve 14, respectively, and kneading is started (S7).
[0017]
Next, the detected temperature T input from the temperature detector 19 that detects the temperature of the kneaded material 4 is taken in (S8), and this detected temperature T is substituted into the following formulas (1) to (3), Control signals Vr, Pr, and Qr are generated.
[0018]
Vr = Vb + Kp1 [(T0-T) + (1 / Ti1) ∫ (T0-T) dt + Td1 · d (T0-T) / dt] (1)
Pr = Pb + Kp2 [(T0-T) + (1 / Ti2) ∫ (T0-T) dt + Td2 ・ d (T0-T) / dt] (2)
Qr = Qb + Kp3 [(T0-T) + (1 / Ti3) ∫ (T0-T) dt + Td3 · d (T0-T) / dt] (3)
[0019]
These control signals Vr, Pr, and Qr are output to the drive motor 17, the cooling water adjustment valve 14, and the pressure adjustment valve 10, respectively, to change the rotation speed and the valve opening, so that the rotor 1. 2 and the pressure and cooling of the ram 7 are changed to cause the detected temperature T to follow the set temperature T0 (S9).
[0020]
Thereafter, as shown in FIG. 2, it is determined whether or not the step time has elapsed since the start of kneading (S10). If not completed (S10, NO), the detected temperature is re-executed from S8. The drive motor 17, the cooling water adjustment valve 14, and the pressure adjustment valve 10 are controlled so as to capture T and follow the set temperature T 0. On the other hand, when the step time is over (S10, YES), it is determined whether or not the current step is the final step (S11). And if it is not the last step (S11, NO), after kneading is stopped (S12), S6 is re-executed and it will be in a standby state until the start of kneading is instructed. On the other hand, if it is the final step as in the kneading step 3 of FIG. 2 (S11, YES), this routine is terminated.
[0021]
As described above, in the kneading control method of the present embodiment, after the set temperature is determined so as to correspond to a series of temperature changes during kneading at which the kneaded product 4 has a predetermined quality, the temperature of the kneaded product 4 is set to the set temperature. The kneading is performed while controlling the control elements directly related to the physical properties of the kneaded product 4 so as to follow. Specifically, the control elements are composed of cooling, pressurization, and kneading, and these control elements are controlled independently. The control element may be other than cooling, pressurization and kneading as long as it is directly related to the physical properties of the kneaded product 4.
[0022]
As a result, the temperature, set temperature, and control element of the kneaded product 4 used when obtaining the kneaded product 4 of a predetermined quality are directly related to the physical properties of the kneaded product 4, so It is possible to control the physical properties of the kneaded material 4 with higher accuracy than when the kneaded material 4 is obtained by using indirectly related temperature rise rates and specific energy supply amounts. As a result, the kneaded material of a predetermined quality is obtained. 4 can be obtained stably. In particular, the control element consists of cooling, pressurization, and kneading, and when these control elements are controlled independently, the temperature followability of the kneaded product 4 with respect to the set temperature can be improved, The physical properties of the kneaded product 4 can be controlled with higher accuracy, and as a result, the kneaded product 4 having a predetermined quality can be obtained more stably.
[0023]
【The invention's effect】
The invention of claim 1 is a kneading control method of a closed kneading apparatus for obtaining a kneaded material of a predetermined quality by kneading while cooling and pressurizing, and a series of kneaded materials from the start of kneading to the end of kneading. The temperature of the kneaded product from the start of kneading to the end of kneading is detected after the temperature corresponding to the temperature change and the temperature at which the kneaded product has a predetermined quality is determined as the preset temperature. The kneaded product is kneaded while repeatedly controlling the control elements directly related to the physical properties of the kneaded product from the start of kneading to the end of kneading so that the detected temperature of the kneaded product follows the set temperature. It is.
As a result, the temperature and set temperature of the kneaded material used when obtaining a kneaded material of a predetermined quality, and the control elements are directly related to the physical properties of the kneaded material, so that it is indirectly related to the physical properties of the kneaded material as in the past. It is possible to control the physical properties of the kneaded material with higher accuracy than when the kneaded material is obtained using the temperature increase rate and the specific energy supply amount, and as a result, a kneaded material of a predetermined quality can be stably obtained. There is an effect that can be.
[0024]
The invention of claim 2 is a kneading control method for a closed kneading apparatus according to claim 1, wherein the control elements are composed of cooling, pressurization and kneading, and these control elements are controlled independently. It is.
Thus, by independently controlling the three control elements consisting of cooling, pressurization, and kneading, the temperature followability of the kneaded product with respect to the set temperature can be improved, so that the physical properties of the kneaded product are further improved. It becomes possible to control with accuracy, and as a result, it is possible to obtain a kneaded product of a predetermined quality more stably.
[Brief description of the drawings]
FIG. 1 is a block diagram of a closed kneading apparatus.
FIG. 2 is an explanatory view showing a kneading state.
FIG. 3 is a flowchart of a kneading control routine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotor 2 Rotor 3 Case member 4 Kneaded material 5 Cooling hole 6 Chamber 7 Ram 8 Lift cylinder 9 Pressure air supply system 10 Pressure adjustment valve 11 Pressure detector 12 Cooling water supply system 14 Cooling water adjustment valve 15 Supply amount detector 16 Drop Door 17 Drive motor 18 Rotational speed detector 19 Temperature detector 20 Control device 21 Input / output unit 22 Signal bus 23 CPU
24 Key input unit 25 Display unit 26 Storage unit 27 Recording unit

Claims (2)

A kneading control method for a closed kneading apparatus that obtains a kneaded product of a predetermined quality by kneading while cooling and pressurizing,
The closed kneading apparatus after determining a temperature corresponding to a series of temperature changes of the kneaded material from the start of kneading to the end of kneading and a value at which the kneaded material has a predetermined quality as a preset temperature. In order to detect the temperature of the kneaded material from the start of kneading to the end of kneading, and to make the detected temperature of the kneaded material follow the set temperature, control elements directly related to the physical properties of the kneaded material are A kneading control method for a closed-type kneading apparatus, characterized in that kneading is performed repeatedly during the period from the start of kneading to the end of kneading.   2. The kneading control method for a closed type kneading apparatus according to claim 1, wherein the control elements comprise cooling, pressurization and kneading, and these control elements are controlled independently.

Images