JPS6033530B2 - Kneading control method of closed type kneader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling kneading in a closed-type bran mixer.

In the field of kneading and processing polymers such as rubber, a method is widely adopted in which various additives are blended into polymers and mixed into rice bran using a closed-type kneader generally referred to as a Banbury mixer.

In this case, uniform plasticity and uniform dispersion of additives such as filler chemicals are required as conditions for satisfying the physical properties of the kneaded polymer. It is necessary to control various operating conditions. Conventionally, the kneading process in this type of closed-type tear kneader has been simply controlled by adjusting the kneader settings based on empirically determined time, temperature, and power consumption.

In other words, sample kneading of the kneaded material is performed in advance, and based on the results, the amount to be added, the order of addition, and the operating conditions (rotor rotation speed, weight pressure, cooling conditions) are determined empirically, and the timing of addition,
At present, standards such as kneading time, kneading twill polymer temperature, and power consumption are established as factors that determine the discharge timing, and kneading machines are operated using some of these as manufacturing standards. However, in reality, the shape, plasticity, and
Concentration temperature and kneading time may vary due to fluctuations in various machine operating conditions such as temperature variations, differences in feeding timing, changes over time in chip clearance between the flights of the thickening rotor and the chamber, and changes in machine temperature and rotation speed. Even if the values are within the allowable range of the standard values, the plasticity and dispersion of the drilled polymer do not reach predetermined values, resulting in variations. For this reason, for example, if it is kneaded too much, productivity will deteriorate, physical properties will be poor, energy loss will occur,
There are problems such as variations in quality, poor physical properties, etc. when kneading is insufficient, and poor physical properties, variations in quality, poor dispersion, etc. when the timing of adding additives is delayed. ~Furthermore, in the past, the operating conditions (rotor rotation speed, weight pressure, cooling conditions) were constant from the beginning to the end of kneading, so the physical properties of the material, which changes from agglomeration to viscosity reduction, do not match the operating conditions, resulting in non-conformity. The kneading was efficient.
In view of these circumstances, the present invention can provide optimal kneading conditions that match the progress and physical properties of the bran mixing process in a closed kneader, thereby ensuring uniform product quality and efficient kneading. The present invention provides a crosstalk control method that can be used.

The kneading control method of the present invention includes the following steps in the moat kneading process in a closed falconry machine: ■ Material blooming, ■ Powder and liquid kneading, @ dispersion of agglomerates, ■ simple mixing, and @ resolution reduction. Focusing on the fact that the physical properties of the polymer change depending on the degree of lacrimation,
In addition, by focusing on the fact that the power consumption value can be used as an indicator of the physical properties (viscosity) of polymers, we used a control circuit to maintain various operating conditions within appropriate ranges set in advance based on experiments, etc. The operating conditions related to power consumption are corrected and controlled within the above-mentioned appropriate range so that the actual power consumption of the rotor drive motor matches a power consumption reference pattern that is an appropriate power consumption pattern.

The present invention will be explained below with reference to the drawings.

In the present invention, a control circuit that controls operating conditions through an adjustment means is used, and a power consumption standard corresponding to a power consumption pattern corresponding to a kneading process during proper operation of a closed-type kneader is set in advance in this control circuit. A pattern and an operating condition reference pattern corresponding to an appropriate range of the operating conditions of the closed thickener according to the kneading process are provided.

These reference patterns are obtained as follows. As mentioned above, the kneading process of the closed kneader includes five steps: ■Bulking, ■Kneading, @Dispersion, ■Simple mixing, and ■Fuchi aging reduction.The power consumption pattern during proper operation is as above. The graph of FIG. 1 corresponds to each process.

In other words, the graph in Figure 1 represents the relationship between the elapsed time of the kneading process from the input of the materials to be kneaded to the discharge of the closed type kneader and the power consumption value per unit time. B shows the time period of the lumping process, C and D show the time period of the dispersion process and simple mixing process, and E shows the time period of the viscosity reduction process. As shown by curve P in the same graph, the power consumption pattern during proper operation increases rapidly over time during time period A of the blooming process, and from the end of the blooming process, it partially overlaps with the soul process. It remains almost at the maximum value until the middle of the kneading process, and then decreases to some extent in the latter half of the kneading process, which overlaps with the dispersion/simple mixing process, and then increases (after that), and overlaps with the latter half of the dispersion/simple mixing process. In the viscosity reduction step, the viscosity gradually decreases over time. Furthermore, it is known that the power consumption value can be used as an index of physical properties as described above, and therefore, in order to keep the physical properties constant, it is sufficient to keep the power consumption in a constant pattern. Therefore, the first
A power consumption pattern as shown in the graph of the figure is given to the control circuit as a reference pattern. Further, regarding various operating conditions of the closed kneading machine, ie, rotor rotation speed, weight pressure, machine temperature, etc., the optimum range pattern corresponding to each of the above-mentioned kneading steps is determined based on experience and experimental data.

For example, as shown in Figure 2, ■ The rotation speed of the rotor drive motor is gradually increased during the viscosity reduction process during kneading (see Figure 2 A), and ■ The weight pressure applied to the Kojika bran material is adjusted when the raw material is input. In the second half of the crane training, the height is gradually lowered (see Figure 2).
, (2) The machine temperature is set high in the first half of kneading and low in the second half (see Fig. 2 (c)), which is the optimum operating condition pattern depending on the degree of moat. In this case, in consideration of changes in operating conditions and the influence of external conditions, a predetermined tolerance range is set as shown by diagonal lines in Figure 2, and an upper limit value that does not adversely affect operating efficiency and kneading quality is set. Find the lower limit value and define the appropriate range between them. Then, these appropriate ranges of various operating conditions are set as operating condition reference patterns. Based on the power consumption reference pattern and operating condition reference pattern given in this way, the actual power consumption during kneading is compared with the above power consumption reference pattern, excess or deficiency is corrected, and the actual power consumption is determined. Control parameters related to power consumption are controlled so as to follow a power reference pattern.

Further, various operating conditions are controlled according to the operating condition reference pattern, and the control according to the above-mentioned power consumption is performed within a range that satisfies the operating condition reference pattern. In other words, while maintaining various operating conditions within the appropriate range determined by the operating condition reference pattern, when there is an excess or deficiency in the actual power consumption (when a difference occurs between the power consumption reference pattern and the power consumption reference pattern), the power consumption The various operating condition adjustment means are controlled so as to adjust and correct the operating conditions. Operating conditions that greatly affect power consumption include rotor rotation speed (rotor drive motor rotation speed) and weight pressure.As a general trend, rotor rotation speed has a high influence throughout the kneading period, while weight pressure The influence is high in the first half of the soaking period. Compared to these, the degree of increase/decrease in power consumption and the responsiveness of machine temperature to the controlled variable are low. Therefore, specifically, for example, in the first half of the kneading period, weight pressure is preferentially corrected in response to excess or deficiency of power consumption, and this is increased or decreased within an appropriate range, and other operating conditions are A specific value (for example, an intermediate value) is maintained within the appropriate range shown in the figure, and in the latter half of the kneading period, the motor rotational speed is preferentially corrected to compensate for excess or deficiency in power consumption to keep it within the appropriate range. At the same time, other operating conditions are controlled to specific values within appropriate ranges. If necessary, if excess or deficiency in power consumption cannot be compensated for by only correcting the above-mentioned specific operating conditions, other operating conditions may also be corrected within appropriate ranges. The reason why control is performed based on both the operating condition standard pattern and the power consumption standard pattern is that it is not possible to simply control various operating conditions to specific values within predetermined appropriate ranges. This is because physical properties become non-uniform due to fluctuations, and various operating conditions cannot necessarily be maintained within appropriate ranges simply by controlling according to power consumption.

Note that in adjusting the operating conditions to correct the difference between the power consumption standard pattern and the actual power consumption, it is usually preferable to set priorities for various operating conditions as described above and then change the priorities. Depending on the soul training conditions such as the type of bran material, the above correction may be performed by adjusting the operating condition alone, for example, the rotor rotation speed. This control method will be explained in more detail with reference to the control flow diagram in Fig. 3. In the figure, reference numeral 1 denotes a batch-type closed kneading machine called a Banbury mixer, in which a two-shaft rotor for kneading is installed in the chamber. The rotor is driven by an external variable motor 2.

The rotation speed of the motor 2 is controlled by a motor control device 3. The Banbury mixer 1 is also equipped with a pneumatically actuated ram 4 for pushing in the raw materials and pressurizing during kneading, and an air pressure adjustment means 6 is provided in the air pressure supply passage 5 to the ram 4. . Furthermore, in order to be able to adjust the machine temperature, piping equipment is provided to send cooling water or heating steam to the chamber, etc. In the piping 7, a solenoid valve 8 for opening/closing the cooling water passage and a solenoid valve 9 for opening/closing the steam passage are installed. and these solenoid valves 8
, 9 is provided. A control circuit 1 for controlling operating conditions for these Banbury mixers and auxiliary equipment includes 1
As one reference element, there is provided a power consumption reference pattern generation circuit 12 in which a power consumption reference pattern corresponding to the power consumption during proper operation described above is programmed.

In addition, as another reference element, an operating condition reference pattern corresponding to the optimum range of operating conditions for each of the above-mentioned kneading processes,
Also, settings such as priority for changing operating conditions during power consumption correction, etc., which will be described later, can be disabled. . It has a programming circuit 13 for generating operating condition reference patterns. On the other hand, the power consumption per unit time in the rotary drive motor 2 is detected, and the detection signal is inputted to the control circuit 11 as a feedback element. In the control circuit 11, the detection signal of the actual power consumption is determined by the comparison circuit 14.
It is compared with a reference signal generated by the power consumption reference pattern generation circuit 12, and an output corresponding to the difference between the two signals is sent to the subsequent arithmetic circuit 15.

When a difference occurs between the two signals, the arithmetic circuit 1
A motor control device 3 that adjusts the rotor rotation speed via the motor 2 according to a control signal from the motor 5; and/or an air pressure adjustment device 6 that adjusts the weight pressure applied to the material to be kneaded by the ram 4. is controlled so that the actual power consumption value matches the power consumption reference pattern. In this case, the arithmetic circuit 151 performs arithmetic processing including the signals from the operating condition reference pattern etc. generation circuit 13, so that the operating condition reference pattern having a certain tolerance range corresponding to each step of trenching is generated. The rotor rotation speed and weight pressure are controlled in accordance with the power consumption reference pattern within a satisfactory range, and in this case, which of the rotor rotation speed and weight pressure should be prioritized or controlled? The priority of operating condition control or change, etc., is also set in advance. In this way, at least one operating condition related to power consumption is corrected according to the detected value of power consumption, and the motor control device 3. The air pressure regulating means 61 for the ram 4 and the operating condition regulating means of the temperature regulator 10 are controlled, and the rotor rotation speed, weight pressure,
The machine temperature is maintained within the optimum range according to the degree of kneading as shown in FIG.

As explained above, the kneading control method of the present invention provides a power consumption standard pattern corresponding to a power consumption pattern corresponding to a kneading process during proper operation for a closed kneader, and a power consumption standard pattern corresponding to a power consumption pattern corresponding to a kneading process under operating conditions. Using a control circuit having as a reference element an operating condition reference pattern corresponding to the appropriate range,
This is because the actual power consumption is compared with the power consumption reference pattern and corrected and controlled to follow the reference pattern, and various operating conditions are controlled to follow the reference pattern of operating conditions. , it is possible to maintain power consumption in a constant and optimal pattern, and to maintain good and uniform physical properties of the materials to be kneaded even when there are fluctuations in machine operating conditions;
Operating conditions such as rotor rotation speed, weight pressure, and machine temperature can be controlled to an optimal pattern that corresponds to changes in physical properties depending on the degree of lamination, resulting in the excellent effect of efficient scrubbing. It is something to play.

[Brief explanation of the drawing]

Figure 1 is a graph showing the power consumption value fluctuation pattern and the time range of each kneading process with respect to the elapse of time during kneading in the proper operating state of the closed type moat kneading machine, and Figure 2 is a graph showing the power consumption value fluctuation pattern in correspondence with the above-mentioned power consumption value fluctuation pattern. FIG. 3 is a graph showing variation patterns of appropriate ranges of various operating conditions, and is a flow diagram of the control method of the present invention. DESCRIPTION OF SYMBOLS 1... Closed kneading machine, 11... Control circuit, 12... Power consumption reference pattern generation circuit, 13... Operating condition reference pattern etc. generation circuit, 14... Comparison circuit, 15...
Arithmetic circuit. Sphere map N Fuji map M

Claims (1)

[Claims] 1. A standard power consumption pattern of the rotor drive motor corresponding to the kneading process during proper operation of the closed kneader and an appropriate range of machine temperature conditions of the closed kneader corresponding to the kneading process are determined in advance. Using a control circuit that stores the set operating condition reference pattern as a reference element, the consumption of the rotor drive motor during operation of the closed kneader is maintained while maintaining various operating conditions within appropriate ranges according to the above operating condition reference pattern. Detects the power, compares the actual power consumption with the above power consumption reference pattern based on the detection signal, and adjusts the operating conditions related to power consumption within the above appropriate range when a difference occurs between the two. 1. A kneading control method for a closed kneading machine, comprising controlling means for adjusting various operating conditions so that actual power consumption follows a reference power consumption pattern. 2. A reference power consumption pattern of the rotor drive motor corresponding to the kneading process during proper operation of the closed kneader, and a reference operating condition pattern that presets the appropriate range of machine temperature conditions of the closed kneader according to the kneading process. By using a control circuit that memorizes the above-mentioned reference elements as well as the priority order of operating conditions, the rotor of the closed kneading machine is The power consumption of the drive motor is detected, and based on the detection signal, the actual power consumption is compared with the above power consumption standard pattern. If a difference occurs between the two, the operating conditions related to power consumption are changed to the above appropriate range. In order to make the actual power consumption follow the power consumption standard pattern by adjusting the
A method for controlling kneading in a closed kneader, characterized in that any one of the above-mentioned operating conditions is preferentially adjusted and the priority is changed to control means for adjusting various operating conditions.