JP2005246785A - Control method of rubber kneading machine, and control device therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control method of a rubber kneader capable of always uniformize the viscosity of a rubber material after the completion of kneading even if there is fluctuation in the viscosity of the rubber material at the start time of kneading, and a control device therefor. <P>SOLUTION: The power value of the rubber kneader 1 during kneading is detected and, when the sum power value of the rubber kndeader per a predetermined time during kneading is larger than a predetermined reference value, the kneading time of the rubber material A is increased and, when the sum power value is smaller than the predetermined reference value, the kneading time of the rubber material A is reduced. Therefore, even if there is fluctuation in the viscosity of the rubber material A at the start time of kneading, the viscosity of the rubber material A at the time of completion can be always uniformized and the processability in the processing of a tire constitution member being a post-process and the stability of dimensional precision can be achieved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a control method and an apparatus for a rubber kneader for kneading a rubber material that is a raw material of a tire component, for example, in the manufacture of a tire.

  Conventionally, when kneading a rubber material that is a raw material of a tire component in the manufacture of a tire, a rubber material such as natural rubber or synthetic rubber is put into a kneading machine together with other compounding agents and arranged in the kneading machine main body. By rotating the pair of rotors, the rubber material in the kneader main body is kneaded by each rotor until a predetermined end condition is reached.

  By the way, in the kneading of the rubber material, the kneading is finished when the elapsed time from the start of kneading, the accumulated power amount of the kneader or the temperature of the rubber material reaches a predetermined specified value. Viscosity of rubber materials varies, and if kneading is always completed under certain conditions, the viscosity at the end of kneading becomes non-uniform for each rubber material, and workability and dimensional accuracy in the processing of tire components in the subsequent process There is a problem that it will cause a decline.

Thus, the temperature of the rubber material at the start of kneading is detected by a temperature sensor attached to the kneading machine body, and the detected temperature is compared with a predetermined reference temperature, and the kneading time and the integrated power amount are increased based on the comparison result. What is made to reduce is known (for example, refer patent document 1).
JP-A-10-24412

  However, in the case where the temperature of the rubber material at the start of kneading is detected by a temperature sensor attached to the kneading machine main body, the temperature of the rubber material on the entire rubber material is different, for example, when the temperature on the surface side differs from the temperature on the inner side. The temperature cannot be accurately grasped, and it is difficult to appropriately increase or decrease the kneading time and the integrated power amount. In addition, the viscosity of the rubber material is not necessarily caused only by the temperature at the start of kneading, and other factors such as variations in the viscosity of the natural material itself, such as natural rubber, affect the viscosity of the rubber material at the end of kneading. In any case, in the case of controlling the kneading time and the integrated power amount based on the temperature of the rubber material, there is a problem that the viscosity of the rubber material at the end of the kneading cannot always be made uniform. .

  The present invention has been made in view of the above problems, and the object of the present invention is to always make the viscosity of the rubber material at the end of kneading uniform even when the viscosity of the rubber material at the start of kneading varies. An object of the present invention is to provide a control method and apparatus for a rubber kneading machine.

  In order to achieve the above object, according to the first aspect of the present invention, in the first aspect of the present invention, the rubber material kneaded by the respective rotors is rotated by rotating a pair of rotors disposed in the kneader body. In the kneader control method, the power value during kneading of the rubber kneader is detected, and if the total power value per predetermined time during kneading is greater than a predetermined reference value, the rotor required from the start to the end of kneading The drive amount is increased, and when the total power value is smaller than the reference value, the rotor drive amount is decreased.

  According to another aspect of the present invention, in the control device of the rubber kneader, the rubber material put into the kneader main body is kneaded by each rotor by rotating a pair of rotors arranged in the kneader main body. The power value detecting means for detecting the power value during kneading of the kneading machine, and if the total power value per predetermined time during kneading is greater than a predetermined reference value, the rotor drive amount required from the start to the end of kneading is increased. And control means for decreasing the rotor drive amount when the total power value is smaller than the reference value.

  Thereby, the kneading time of the rubber material is increased when the total power value per predetermined time during kneading is larger than the predetermined reference value, and the kneading time of the rubber material when the total power value is smaller than the predetermined reference value. Therefore, even when there is a variation in the viscosity of the rubber material at the start of kneading, the viscosity of the rubber material at the end of kneading can always be made uniform. In this case, since the total power value per predetermined time is compared with the reference value, the influence due to the instantaneous power value fluctuation is reduced.

  According to the present invention, even when there is a variation in the viscosity of the rubber material at the start of kneading, the viscosity of the rubber material at the end of kneading can always be made uniform. And stabilization of dimensional accuracy can be achieved. In this case, it is possible to reduce the influence of instantaneous fluctuations in the power value, so that accurate data can always be used.

  1 to 7 show an embodiment of the present invention. FIGS. 1 and 2 are schematic front sectional views of a rubber kneader, FIG. 3 is a block diagram showing a configuration of a control device, and FIG. FIG. 5 is a diagram showing a change in electric power value, FIG. 6 is a diagram showing a temperature change of the rubber material, and FIG. 7 is a diagram showing the viscosity of the rubber material at the start and end of kneading.

  The kneading machine 1 shown in FIG. 1 includes a kneading machine main body 2 into which a rubber material A and a compounding agent B are charged, a pair of rollers 3 rotatably provided in the kneading machine main body 2, and a kneading machine main body 2 And a ram 4 as a pressing member for pressing the rubber material A from above.

  The kneading machine main body 2 has a kneading part 2a for accommodating each roller 3, and an opening 2b is provided at the center of the upper surface of the kneading part 2a. A first charging port 2c is provided on one side surface of the kneading machine main body 2, and the rubber material A conveyed by the first conveyor 5 is charged into the first charging port 2c. A second charging port 2d is provided on the other side surface of the kneading machine body 2, and the compounding agent B conveyed by the second conveyor 6 is charged into the second charging port 2d. A drop door 2e for discharging the rubber material A in the kneading part 2a downward is provided on the lower surface of the kneading machine main body 2.

  The rollers 3 are arranged in the width direction of the kneading machine main body 2, and are rotated in a predetermined direction by a motor (not shown) to knead the rubber material A in the kneading part 2a.

  The ram 4 is formed in a shape capable of closing the opening 2b of the kneading portion 2a, and is provided so as to be movable in the vertical direction within the kneading machine main body 2 by a shaft 4a connected to the upper end thereof. Moreover, the ram 4 descend | falls to the kneading part 2a, and pressurizes the rubber material A in the kneading part 2a with its own weight or a spring.

  The control device 10 of this embodiment is charged into the kneader 1, a power value detector 11 that detects the power value of the kneader 1, a temperature sensor 12 that detects the temperature of the rubber material A in the kneader 1. A first weight measuring device 13 for measuring the weight of the rubber material A, a second weight measuring device 14 for measuring the weight of the compounding agent B put into the kneading machine 1, and a vertical position of the ram 4 are detected. The ram sensor 15 and the control unit 16 for controlling the operation of the kneader 1 are configured.

  The power value detector 11 has a well-known configuration for detecting a power value based on the voltage and current of the power supply circuit of the kneading machine 1, and continuously detects the power value during kneading.

  The temperature sensor 12 includes a known device such as a thermistor and is attached to the wall surface of the kneading part 2a.

  The first weight measuring device 13 is a well-known device such as a load cell, and is provided on the first conveyor 5.

  The second weight measuring device 14 is a well-known device such as a load cell, and is provided on the second conveyor 6.

  The ram sensor 15 includes a known device such as an optical sensor, and is attached to the kneading machine body 2 at a predetermined position in the vertical direction. In this case, the ram sensor 15 detects the ram 4 lowered to a predetermined lower limit position.

  The control unit 16 includes a microcomputer, and is connected to the kneader 1, the power value detector 11, the temperature sensor 12, the first weight measuring device 13, the second weight measuring device 14, and the ram sensor 15. Based on the total power value per predetermined time detected by the power value detector 11, the control unit 16 increases the rotor drive amount required from the start to the end of kneading, and when the total power value is smaller than the reference value, Equipped with a program to reduce the rotor drive amount, specifically, the rotor drive amount is increased by increasing the rotor drive amount by increasing the kneading time from the start to the end of kneading and shortening the kneading time from the start to the end of the kneading. Is supposed to decrease. The controller 16 is set with first to third kneading times T1 to T3 (T1 <T2 <T3) as the time from the start of kneading, and the third kneading time T3 ends from the start of kneading. Normal kneading time is set.

  Here, operation | movement of the control part 16 in the control apparatus 10 is demonstrated according to the flowchart of FIG.

  First, the weight of the rubber material A put into the kneading machine 1 is measured by the first weight measuring device 13 (S1), and the weight of the compounding agent B put into the kneading machine 1 is measured by the second weight measuring device 14. (S2). In the kneader 1, natural rubber or synthetic rubber is added as the rubber material A, and carbon, zinc oxide, an antioxidant, etc. are added as the compounding agent B.

  Next, when the charging of the rubber material A and the compounding agent B is completed (S3), the ram 4 is lowered as shown in FIG. 2 to pressurize the rubber material A (S4), and each rotor 3 is rotated. Kneading is started (S5), and time measurement by a timer is started (S6). At this time, since the apparent volume of the rubber material A is increased due to the space existing in the rubber material A, the ram 4 does not reach the predetermined lower limit position, but as the kneading proceeds, the rubber material Since the space in A is eliminated, the ram 4 gradually descends.

  Thereafter, the ram 4 is moved up and down (S7), and when the first kneading time T1 is reached (S8), the power value at that time is detected as the first power value P1 (S9), The temperature of the rubber material A is detected as the first temperature t1 (S10). Next, after the ram 4 is moved up and down again (S11), if the second kneading time T2 is reached (S12), the power value at that time is detected as the second power value P2 (S13), The temperature of the rubber material A at that time is detected as the second temperature t2 (S14).

  Here, when all the conditions of the following steps S15 to S17 are satisfied, the total power value ΔP per predetermined time Δt is detected (S18), and when any of the conditions of steps S15 to S17 is not satisfied, the step is performed. If the third kneading time T3 is reached without proceeding to S18 (S19), the kneading is terminated (S20).

  That is, the second power value P2 is smaller than the first power value P1 in step S15, the second temperature t2 is larger than the first temperature t1 in step S16 (S16), and the ram 4 is turned on in step S17. When the lower limit position has been reached (S17), a total power value ΔP per predetermined time Δt (eg, 3 seconds) is detected in step S18, and a fourth kneading time T4 for ending kneading is set (S21).

  In this case, the total power value ΔP is compared with a predetermined reference power value stored in advance, and if the total power value ΔP is larger than a predetermined allowable range of the reference power value, the fourth kneading time T4 is set. When the total power value ΔP is set to a time longer than the third kneading time T3 and the reference power value is smaller than the allowable range, the fourth kneading time T4 is set to a time shorter than the third kneading time T3. Set. When the total power value ΔP is within the allowable range of the reference power value, the fourth kneading time T4 is set equal to the third kneading time T3. FIG. 5 shows the case where the fourth kneading time T4 is set longer than the third kneading time T3. The fourth kneading time T4 can be set, for example, by selecting a corresponding value from a plurality of data stored in advance in the data table, or the total power value ΔP at the third kneading time T3. It may be calculated by multiplying a predetermined increase rate or decrease rate according to the above.

  Next, the fourth kneading time T4 set as described above is corrected based on the total weight of the rubber material A and the compounding agent B (S22). That is, the total weight of the rubber material A and the compounding agent B is compared with a predetermined reference weight, and when the total weight is larger than a predetermined allowable range of the reference weight, the fourth kneading time T4 is set to be larger than the set value. If the total weight is smaller than the allowable range of the reference weight, the fourth kneading time T4 is corrected to be shorter than the set value. When the total weight is within the allowable range of the reference weight, the fourth kneading time T4 is not corrected. For this correction value, for example, a corresponding value is selected from a plurality of data stored in advance in the data table, or a predetermined correction rate corresponding to the total weight during the fourth kneading time T4. You may make it calculate by multiplying.

  Further, the fourth kneading time T4 set (corrected as necessary) as described above is corrected based on the temperature (second temperature t2) when the second power value P2 is detected (S22). That is, the second temperature t2 is compared with a predetermined reference temperature, and if the second temperature t2 is higher than the predetermined allowable range of the reference temperature, the fourth kneading time T4 becomes shorter than the set value. When the second temperature t2 is lower than the allowable range of the reference temperature, the fourth kneading time T4 is corrected to be longer than the set value. If the second temperature t2 is within the allowable range of the reference temperature, the fourth kneading time T4 is not corrected. For this correction value, for example, a corresponding value is selected from a plurality of data stored in advance in the data table, or a predetermined value corresponding to the second temperature t2 during the fourth kneading time T4. It may be calculated by multiplying the correction factor.

  Thereafter, when the fourth kneading time T4 is reached (S23), the kneading is finished (S20).

  As described above, according to the present embodiment, the power value of the kneader 1 during kneading is detected, and the kneading of the rubber material A is performed when the total power value per predetermined time during kneading is larger than a predetermined reference value. The rotor drive amount is increased by increasing the time, and when the total power value is smaller than the predetermined reference value, the rotor drive amount is decreased by shortening the kneading time of the rubber material A. FIG. As shown in FIG. 4, even when the viscosity of the rubber material A at the start of kneading varies, the viscosity of the rubber material A at the end of kneading can always be made uniform, and the workability in the processing of the tire constituent member which is a subsequent process In addition, the dimensional accuracy can be stabilized. In this case, since the total power value per predetermined time is compared with the reference value, the influence due to the instantaneous power value fluctuation can be reduced, and accurate data can always be used.

  Further, since the kneading amount of the rubber material A is increased or decreased based on the total power value detected after the ram 4 is moved up and down, the power value when the viscosity is stabilized by the vertical movement of the ram 4 is detected. Therefore, the total power value that is a reference for controlling the kneading amount can always be accurately detected.

  In this case, when the power value when the total power value per predetermined time is detected is larger than the power value before the ram 4 is moved up and down, the rubber amount is not increased or decreased based on the total power value. Since the material A is kneaded, after the ram 4 is moved up and down, the total power value is detected only when the load of each rotor 3 decreases due to the stability of the viscosity of the rubber material A and the power value decreases. Therefore, it is possible to reliably prevent control based on an inappropriate total power value.

  Further, when the temperature of the rubber material A when the total power value per predetermined time is detected is lower than the temperature before the ram 4 is moved up and down, the kneading amount is not increased or decreased based on the total power value. Since the rubber material A is kneaded, the total power value can be detected only when the temperature of the rubber material A rises due to the stability of the viscosity after the ram 4 is moved up and down. Control based on the value can be reliably prevented.

  Furthermore, when the position of the ram 4 when the total power value per predetermined time is detected does not drop to the predetermined lower limit position, the rubber material A is added without increasing or decreasing the kneading amount based on the total power value. Since the kneading is performed, the total power value can be detected only when the ram 4 is sufficiently lowered due to the stability of the viscosity of the rubber material A after the ram 4 is moved up and down, resulting in an inappropriate total power value. Control based on this can be reliably prevented.

  Further, since the kneading amount of the rubber material A is corrected according to the total weight of the rubber material A and the compounding agent B introduced into the kneading machine body 10, the total weight of the rubber material A and the compounding agent B varies. Even when there is, the kneading time of the rubber material A can always be made appropriate. In this case, the kneading amount may be corrected according to the total weight of the rubber material A alone.

  Further, since the kneading amount of the rubber material A is corrected according to the temperature of the rubber material A when the total power value is detected, the kneading time of the rubber material A even when the temperature of the rubber material A varies. Can always be appropriate.

  In the embodiment, the kneading amount of the rubber material A is increased by increasing the kneading time from the start to the end of kneading of the rubber material A, and is decreased by shortening the kneading time. For example, the kneading amount is increased by increasing the total power value from the start to the end of kneading of the rubber material A, and the kneading amount is decreased by decreasing the total power value. Alternatively, the kneading amount may be increased by increasing the temperature at which the kneading of the rubber material A is finished, or decreased by lowering the temperature at which the kneading is finished.

1 is a schematic front sectional view of a rubber kneader showing an embodiment of the present invention. Schematic front sectional view of a rubber kneader showing the state where the ram is lowered Block diagram showing the configuration of the control device Flow chart showing operation of control unit Diagram showing changes in power value Diagram showing temperature change of rubber material Diagram showing viscosity of rubber material at the start and end of kneading

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Kneading machine, 2 ... Kneading machine main body, 3 ... Rotor, 4 ... Ram, 10 ... Control apparatus, 11 ... Electric power value detector, 12 ... Temperature sensor, 13 ... 1st weight measuring device, 14 ... 2nd Weight measuring device, 15 ... ram sensor, 16 ... control unit, A ... rubber material, B ... compounding agent.

Claims (11)

In a method for controlling a rubber kneader, by rotating a pair of rotors arranged in a kneading machine body, the rubber material put into the kneading machine body is kneaded by each rotor.
While detecting the power value during kneading of the rubber kneader,
When the total power value per predetermined time during kneading is larger than a predetermined reference value, the rotor driving amount required from the start to the end of kneading is increased, and when the total power value is smaller than the reference value, the rotor driving amount is increased. A method for controlling a rubber kneader characterized in that it is reduced. 2. The rubber kneader according to claim 1, wherein the rotor driving amount is increased by increasing a kneading time from the start to the end of kneading, and is decreased by shortening a kneading time from the start to the end of kneading. Control method. 2. The rubber according to claim 1, wherein the rotor driving amount is increased by increasing a total power value from the start to the end of kneading and decreased by decreasing a total power value from the start to the end of kneading. Control method of kneader. 2. The method of controlling a rubber kneading machine according to claim 1, wherein the rotor driving amount is increased by increasing the temperature at which the kneading of the rubber material is increased, and is decreased by decreasing the temperature at which the kneading is completed. . The rotor driving amount is increased or decreased based on the total power value detected after a pressure member that pressurizes the rubber material in the kneading machine main body from above is moved up and down. 3. A method for controlling a rubber kneader according to 3 or 4. When the power value when the total power value is detected is larger than the power value before the pressurizing member is moved up and down, the rubber material is kneaded without increasing or decreasing the rotor driving amount based on the total power value. The method for controlling a rubber kneader according to claim 5. If the temperature of the rubber material when the total power value is detected is lower than the temperature before the pressure member is moved up and down, the rubber material is kneaded without increasing or decreasing the rotor driving amount based on the total power value. The method for controlling a rubber kneader according to claim 5 or 6, wherein: The rubber material is kneaded without increasing or decreasing the rotor driving amount based on the total power value when the position of the pressurizing member when the total power value is detected is not lowered to a predetermined position. The method for controlling a rubber kneader according to claim 5, 6 or 7. The said rotor drive amount is correct | amended according to the total weight of the rubber material thrown in in a kneading machine main body, or the total weight of a rubber material and another compound, The 1, 2, 3, 4, 5 characterized by the above-mentioned. 6. A method for controlling a rubber kneader according to 6, 7 or 8. The rubber according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, wherein the rotor driving amount is corrected according to a temperature of a rubber material when the total power value is detected. Control method of kneader. In a control device for a rubber kneader that kneads a rubber material put into the kneader main body by each rotor by rotating a pair of rotors arranged in the kneader main body,
A power value detecting means for detecting a power value during kneading of the rubber kneader;
When the total power value per predetermined time during kneading is larger than a predetermined reference value, the rotor driving amount required from the start to the end of kneading is increased, and when the total power value is smaller than the reference value, the rotor driving amount is increased. A control device for a rubber kneader characterized by comprising a control means for reducing the control means.

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