JP2016043486A - Method for controlling rubber kneading device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control method for a rubber kneading device capable of improving productivity by raising the operation rate of the kneading machine while preventing mixing of heterogeneous rubbers when continuously kneading heterogeneous rubber materials.SOLUTION: In continuously kneading heterogeneous rubber materials R1, R2 using a rubber kneading device 1 composed of a rubber kneading machine 2 and an underneath mixer 10 disposed below the kneading machine, the times required for processes in the rubber kneading machine 2 and the mixer 10, respectively are grasped every kneading batch. By setting the process starting time in the rubber kneading machine 2 on the basis of the grasped time, the rubber material R immediately after completion of the process in the kneading machine 2 is charged in the mixer 10 just after the process in the mixer 10 is completed, and the discharge of a sheet-like rubber material R from the mixer 10 is completed.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a method for controlling a rubber kneading apparatus, and more specifically, improves the operation rate of a rubber kneader while preventing different types of rubber from being mixed when different types of rubber materials are continuously kneaded. The present invention relates to a method for controlling a rubber kneading apparatus capable of obtaining high productivity.

  When manufacturing rubber products such as tires, there is a kneading step in which raw rubber and various compounding agents are mixed and kneaded by a rubber kneader. The rubber material kneaded by the rubber kneader is, for example, put into a lower undermixer and seated, and then sent to the next process as a sheet-like rubber material (see Patent Document 1). When a different kind of rubber material is continuously kneaded using a rubber kneader composed of such a rubber kneader and an undermixer, it is necessary to be careful not to mix the front and rear dissimilar rubbers.

  Conventionally, in order not to mix different types of rubber, the operator has confirmed that the rubber material previously kneaded by the rubber kneader is completely discharged from the undermixer. After this confirmation, another type of rubber material to be kneaded next was put into a rubber kneader and kneaded. Therefore, there is a problem that the standby time for the rubber kneader to wait until the next rubber material is kneaded becomes long, and the operating rate is lowered. This has been one of the obstacles in improving rubber productivity. There is also a problem that the burden on the operator is heavy.

Japanese Patent Laid-Open No. 10-34735

  An object of the present invention is to provide a rubber kneading which can improve the operation rate of a rubber kneader and obtain high productivity while preventing different types of rubber from being mixed when continuously mixing different types of rubber materials. It is to provide a method for controlling an apparatus.

  In order to achieve the above object, the rubber kneader control method of the present invention uses a rubber kneader comprising a rubber kneader and an undermixer disposed below the rubber kneader. The rubber material kneaded by the above is put into the undermixer, discharged into a sheet-like rubber material by this undermixer, and sequentially a new batch of rubber material is kneaded by the rubber kneader and the undermixer to form a sheet. In the control method of the rubber kneading apparatus for obtaining the rubber material, the time required for the process in each of the rubber kneader and the undermixer is previously grasped for each batch to be kneaded, and based on the time grasped in advance. By setting the process start time in the rubber kneading machine, when the different types of rubber materials are kneaded continuously, the under Immediately after the discharge of the sheet-like rubber material was process is completed in the mixer is completed, and wherein placing the rubber material immediately after step has been completed in the rubber kneading machine to the under mixer.

  According to the present invention, kneading by the rubber kneader and the undermixer is preliminarily grasped for each batch of the rubber material to be kneaded, based on the time required for the kneading step in the rubber kneader and the time required for the kneading step in the undermixer. By controlling the rubber material, the rubber material immediately after completing the process in the rubber kneader is charged into the undermixer immediately after the rubber material previously charged into the undermixer is formed into a sheet and discharged. be able to. As a result, even when different types of rubber are continuously kneaded, it is possible to prevent problems that different types of rubber are mixed in the undermixer, and it is possible to knead continuously with minimal waiting time. become. Along with this, the operation rate of the rubber kneader is improved, and a rubber material can be obtained with high productivity.

  Further, it is not necessary for the operator to confirm that the kneaded rubber material is completely discharged from the inside of the undermixer for each batch. Therefore, the burden on the operator is reduced.

  Here, the time required for the process in the undermixer of the rubber material introduced immediately before the undermixer is predicted in real time, and based on the comparison between the prediction result and the time required for the process in the undermixer that is grasped in advance. Thus, the kneading conditions of the rubber material kneaded by the rubber kneader can be adjusted. Thereby, even when the time required for the process in the undermixer becomes longer than the time grasped in advance for some reason, it is advantageous to surely prevent the problem that different types of rubber are mixed in the undermixer.

  The adjustment of the kneading time of the rubber material kneaded by the rubber kneader is, for example, based on the relationship obtained in advance between the accumulated rotational speed of the rotor of the rubber kneader and a predetermined parameter in the process of the rubber kneader. Based on this, the rotational speed of the rotor is adjusted.

  When abnormality is detected in the process in the undermixer, for example, the rotational speed of the rotor of the rubber kneader is reduced, and the ram provided in the rubber kneader is positioned above a predetermined position during kneading. To delay the charging time of the rubber material kneaded by the rubber kneader into the undermixer, or stop charging into the undermixer. Thereby, even when an abnormality occurs in the undermixer, it is possible to prevent a problem that different types of rubber are mixed in the undermixer.

It is explanatory drawing which illustrates the rubber kneading apparatus used for this invention. It is explanatory drawing which illustrates the state which knead | mixes the rubber material using the rubber kneading apparatus of FIG. It is explanatory drawing which illustrates typically the kneading | mixing procedure by this invention. It is explanatory drawing which illustrates typically the kneading | mixing procedure by a conventional method. It is a graph which shows the relationship between the integrated rotation speed of a rotor of a rubber kneader, and integrated electric power. It is a graph which shows the relationship between the rotation speed of the rotor of a rubber kneader, and the temperature of rubber material. It is a graph which shows the relationship between the accumulated rotation speed of the rotor of a rubber kneader, and the accumulated heat history amount of a rubber material.

  Hereinafter, the control method of the rubber kneading apparatus of the present invention will be described based on the embodiments shown in the drawings.

  A rubber kneading apparatus 1 illustrated in FIGS. 1 and 2 includes a rubber kneader 2 and an undermixer 10 connected below the rubber kneader 2. The rubber kneader 2 includes a control unit 2a and a sensor 2b. Detection data of the sensor 2b is input to the control unit 2a, and the operation of the rubber kneader 2 is controlled by the control unit 2a.

  The rubber kneader 2 includes a kneading chamber 4 and a ram chamber 5 connected to the upper side of the kneading chamber 4, and the kneading chamber 4 includes a pair of rotors 3 and an oil charging portion 7a for charging oil. Is provided. Each rotor 3 is rotationally driven by a rotating shaft 3a arranged in parallel. A discharge door 9 that opens and closes is provided on the bottom surface of the kneading chamber 4. In the kneading chamber 4, a rubber material R composed of raw rubber G, carbon C, oil and the like is mixed and kneaded.

  A ram 6 is installed in the ram chamber 5. The ram 6 moves between a predetermined position when the rubber material R is kneaded and a standby position above the predetermined position, and adjusts the internal pressure (ram pressure) of the kneading chamber 4. The ram chamber 5 is provided with a rubber charging portion 7b for charging raw rubber G and a hopper 8 for charging carbon C.

  The sensor 2b detects the rotational speed of the rotor 3, the current value I of the motor for driving the rotation of the rotor 3, the temperature T of the kneading chamber 4, the temperature Tr of the rubber material R, the ram pressure Pr, and the like. Based on these detection data, the control unit 2a calculates the total number of rotations of the rotor, the amount of time change of the current value I, the power required for driving, the integrated power that is the integrated value of this power, and the like.

  The undermixer 10 includes a screw 12 provided in the casing 11 and a pair of sheeting rolls 13. The undermixer 10 further includes a control unit 10a and a sensor 10b. Detection data of the sensor 10b is input to the control unit 10a, and the operation of the undermixer 10 is controlled by the control unit 10a. The control unit 10a and the control unit 2a provided in the rubber kneader 2 are configured to transmit and receive data to and from each other.

  In the undermixer 10, the charged rubber material R is extruded by a screw 12, and then passed through a pair of sheeting rolls 13 to form a sheet-like rubber material R.

  The sensor 10b detects the rotational speed of the screw 12, the rotational speed of the sheeting roll 13, the gap between the rolls 13, the internal pressure of the casing 11, and the like.

  Next, the procedure of the present invention for kneading the rubber material R using the rubber kneading apparatus 1 will be described. In the following description, as shown in FIG. 3, a case where the same type of rubber material R1 is kneaded continuously for two batches and then different types of rubber material R2 are kneaded is taken as an example. 3 and 4, the first batch of rubber material R1 is indicated by R1 (1), and the second batch of rubber material R1 is indicated by R1 (2). In addition, the weight for each batch of the rubber materials R1 and R2 is also input and stored in the control unit 2a and the control unit 10a.

  First, in the rubber kneader 2, when the first batch of the rubber material R1 is kneaded and the process is completed, the rubber material R is put into the undermixer 10. The time required for the process in the rubber kneader 2 is T1. In the undermixer 10, the charged rubber material R1 is extruded by a screw 12, and then passed through a pair of sheeting rolls 13 to form a sheet-like rubber material R1. The time required for the process in the undermixer 10 is t1.

  In the rubber kneader 2, the second batch of rubber material R1 is then kneaded in the same manner as in the first batch. The kneaded rubber material R1 of the second batch is also put into the undermixer 10 in the same manner as the first batch and formed into a sheet shape. In the rubber kneader 2, after the second batch of the rubber material R1 is charged into the undermixer 10, the rubber material R2 is kneaded following the rubber material R1.

  In the rubber kneader 2, when the rubber material R2 is kneaded and the process is completed, the rubber material R2 is put into the undermixer 10. The rubber material R2 requires more time for kneading than the rubber material R1, and the time required for the process in the rubber kneader 2 is T2. In the undermixer 10, the charged rubber material R <b> 2 is extruded by a screw 12, and then passed through a pair of sheeting rolls 13 to form a sheet-like rubber material R <b> 2. The time required for the process in the undermixer 10 is t2.

  Here, the times T1 and T2 and the times t1 and t2 are previously grasped from past results, and are stored in the control unit 2a and the control unit 10a, respectively. Therefore, in the rubber kneader 2, the process is completed for the rubber materials R1 and R2 at times T1 and T2, respectively, under the control of the control unit 2a. In the undermixer 10, the process is completed for the rubber materials R1 and R2 at times t1 and t2, respectively, under the control of the control unit 10a.

  In the present invention, for each batch to be kneaded, the process start time for the rubber material R2 in the rubber kneader 2 is set based on the above-described times t1 and T2 for the rubber material R1. That is, when the different types of rubber materials R1 and R2 are continuously kneaded, immediately after the process in the undermixer 10 is completed and the sheet-like rubber material R1 is discharged (discharge completed), the rubber kneader 2 Even if the rubber material R2 immediately after the completion of the process is put into the undermixer 10, the process start time for the rubber material R2 in the rubber kneader 2 is automatically set so that the rubber materials R1 and R2 are not mixed in the undermixer 10. Is set.

  For example, in the conventional method, as shown in FIG. 4, in order to prevent a problem that different types of rubber materials R1 and R2 are mixed in the undermixer 10, the second batch of the rubber material R1 is discharged in a sheet shape in the undermixer 10. After the process was completed, the rubber kneading machine 2 started kneading the rubber material R2. That is, in the conventional method, the standby time for waiting until the rubber material R2 is mixed by the rubber kneader 2 is great.

  On the other hand, according to the present invention, the standby time for waiting until the rubber material R2 is mixed by the rubber kneader 2 can be extremely short. By using the present invention as described above, even when different types of rubber materials R1 and R2 are continuously kneaded, the rubber kneader is prevented while preventing the rubber materials R1 and R2 from being mixed in the undermixer 10. 2 can be continuously kneaded with a minimum waiting time of 2. Along with this, the operation rate of the rubber kneader 2 is improved, which is advantageous for obtaining the rubber materials R1 and R2 with high productivity.

  By the way, the times T1, T2, t1, and t2 required for the processes in the rubber kneader 2 and the undermixer 10 may vary depending on the outside air temperature or the like, or may vary depending on an unexpected cause. Therefore, the time t1 required for the process in the undermixer 10 of the rubber material R1 introduced immediately before the undermixer 10 may be predicted in real time. The kneading conditions of the rubber material R2 kneaded by the rubber kneader 2 may be adjusted based on a comparison between the prediction result and the time t1 required for the process in the undermixer 10 that is grasped in advance.

  By performing such control, for example, when the time t1 required for the process in the undermixer 10 becomes longer than the time grasped in advance for some reason, the rubber material R2 in the rubber kneader 2 is Adjust the kneading time to make it longer. Specifically, the time when the rubber material R2 is charged into the undermixer 10 from the rubber kneader 2 and the time when the discharge of the rubber material R1 from the undermixer 10 is completed are the same. As a result, the rubber material R2 is thrown into the undermixer 10 where the rubber material R1 still remains, and it is easier to reliably prevent the occurrence of a problem that the rubber material R1 and the rubber material R2 are mixed in the undermixer 10. .

  Here, when the kneading time of the rubber material R2 in the rubber kneader 2 is simply increased, the rubber material R is excessively kneaded, and the quality is adversely affected. Therefore, the rotational speed of the rotor 3 is reduced from the initial rotational speed. Alternatively, the ram pressure Pr is reduced by moving the ram 6 to a position above a predetermined position at the time of kneading. Alternatively, the ram pressure Pr can be reduced while reducing the rotational speed of the rotor 3.

  The adjustment of the kneading conditions of the rubber material R2 kneaded by the rubber kneader 2 is obtained in advance by, for example, obtaining the accumulated rotational speed of the rotor 3 of the rubber kneader 2 and predetermined parameters in the process of the rubber kneader 2 in advance. This is done by adjusting the rotational speed of the rotor based on the relationship.

  As illustrated in FIG. 5, the relationship between the accumulated number of rotations of the rotor 3 and the accumulated value (integrated power) of the electric power required for driving the rotor 3 is linear as shown by the broken line in a predetermined region. Further, as illustrated in FIG. 6, the relationship between the accumulated rotational speed of the rotor 3 and the temperature Tr of the rubber materials R <b> 1 and R <b> 2 is linear as shown by a broken line in a predetermined region. As illustrated in FIG. 7, the relationship between the accumulated rotational speed of the rotor 3 and the accumulated heat history amount of the rubber materials R1 and R2 is linear in a predetermined region as indicated by a broken line.

  The adjustment of the kneading conditions of the rubber material R2 kneaded by the rubber kneader 2 is performed by, for example, integrating the number of rotations of the rotor 3 of the rubber kneader 2 and predetermined parameters (integrated power, temperature, This is performed by adjusting the rotational speed of the rotor 3 based on the previously acquired relationship with the cumulative heat history amount.

  Specifically, the accumulated heat history amount necessary for completing the kneading of the rubber material R2 is grasped, and the accumulated heat history amount of the rubber material R kneaded by the rubber kneader 2 is grasped. Kneading to achieve a heat history amount. At this time, the rotational speed of the rotor 3 is adjusted (changed) based on the linear straight line data of FIG.

  Alternatively, the accumulated power of the rotor 3 necessary for completing the kneading of the rubber material R2 is grasped, and the accumulated power of the rubber kneader 2 kneading the rubber material R2 becomes the grasped necessary accumulated power. Knead. At this time, the rotational speed of the rotor 3 is adjusted (changed) based on the linear straight line data of FIG.

  Alternatively, the temperature of the rubber material R2 necessary for completing the kneading of the rubber material R2 is grasped, and the temperature Tr of the rubber material R kneaded by the rubber kneader 2 becomes the grasped necessary temperature. Knead. At this time, the rotational speed of the rotor 3 is adjusted (changed) based on the linear straight line data of FIG.

  In this embodiment, an abnormality in the process in the undermixer 10 can be detected by the sensor 10b. Specifically, when the rotational speed of the screw 12, the rotational speed of the sheeting roll 13, the gap between the rolls 13, the internal pressure of the casing 11, etc. deviates from the preset normal range, it is detected that an abnormality has occurred. .

  When the sensor 10b detects an abnormality in the undermixer 10, the information is transmitted from the control unit 10a to the control unit 2a. The control unit 2a that has received the information, for example, reduces the rotational speed of the rotor 3 of the rubber kneader 2 and moves the ram 6 to a position above the predetermined position during kneading. Thereby, kneading | mixing of the rubber material R2 knead | mixed with the rubber kneader 2 is delayed, and the time required to complete this process is lengthened. Along with this, the charging time of the rubber material R2 into the undermixer 10 is delayed. In some cases, the charging of the rubber material R2 into the undermixer 10 is stopped.

  By performing such control, it is possible to prevent the rubber materials R1 and R2 from being mixed in the undermixer 10 even when an abnormality occurs in the undermixer 10.

  In addition, the rubber kneader 2 and the undermixer 10 constituting the rubber kneading apparatus 1 are not limited to the structures described above, and various structures can be adopted.

DESCRIPTION OF SYMBOLS 1 Rubber kneading apparatus 2 Rubber kneader 2a Control part 2b Sensor 3 Rotor 3a Rotating shaft 4 Kneading chamber 5 Ram chamber 6 Ram 7a Oil charging part 7b Rubber charging part 8 Hopper 9 Discharge door 10 Undermixer 10a Control part 11 Casing 12 Screw 13 Sheeting roll R, R1, R2 Rubber material

Claims (4)

The rubber material kneaded by the rubber kneader is charged into the under mixer using a rubber kneader comprising a rubber kneader and an undermixer disposed below the rubber kneader. In the method of controlling a rubber kneading apparatus, a sheet-like rubber material is discharged and sequentially, a new batch of rubber material is kneaded by the rubber kneader and the undermixer to obtain a sheet-like rubber material.
For each batch to be kneaded, the time required for the process in each of the rubber kneader and the undermixer is grasped in advance, and the process start time in the rubber kneader is set based on the time grasped in advance. Thus, when the different types of rubber materials are continuously kneaded, the rubber immediately after the process in the rubber kneader is completed immediately after the process in the undermixer is completed and the discharge of the sheet-like rubber material is completed. A method for controlling a rubber kneading apparatus, wherein a material is charged into the undermixer.   Predicting in real time the time required for the process in the undermixer of the rubber material introduced immediately before the undermixer, and based on the comparison between the prediction result and the time required for the process in the undermixer that has been grasped in advance The method for controlling a rubber kneading apparatus according to claim 1, wherein the kneading conditions of the rubber material kneaded by the rubber kneader are adjusted.   The adjustment of the kneading conditions of the rubber material kneaded by the rubber kneader is based on the relationship acquired in advance between the accumulated rotational speed of the rotor of the rubber kneader and the predetermined parameter in the process of the rubber kneader. The method for controlling a rubber kneading apparatus according to claim 2, wherein the rotation speed of the rotor is adjusted.   When an abnormality in the undermixer is detected, the rotor rotational speed of the rubber kneader is reduced and the ram provided in the rubber kneader is moved to a position above a predetermined position during kneading. The rubber kneading apparatus according to any one of claims 1 to 3, wherein a rubber material kneaded by the rubber kneader is delayed in charging time into the undermixer, or is stopped from being charged into the undermixer. Control method.

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