JP2007313797A - Temperature control method of extrusion material of extruder and temperature control apparatus therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a temperature control method of an extrusion material of an extruder constituted so as to always precisely obtain the extrusion material having a target temperature even in a case that the taking-over speed of the extrusion material is altered between batches or in the same batch, and a temperature control apparatus therefor. <P>SOLUTION: The time before detection from the point of time when the extrusion material R is extruded from the extruder 8 to the point of time when the temperature of the extrusion material R is detected by a temperature sensor 2 is preset as a definite time and a detection position, where the temperature of the extrusion material R is detected by the temperature sensor 2, is calculated by a control device 7 on the basis of the time before detection and the taking-over speed of the extrusion material R while the temperature sensor 2 is moved to the calculated position by means of a ball screw 3 by controlling a servomotor 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an extrusion material temperature control method and apparatus for an extruder, and more specifically, in an extruder such as a rubber sheet material, even if the take-up speed of the extrusion material may be changed between batches or in the same batch, The present invention relates to an extrusion material temperature control method and apparatus for an extruder that can always obtain an extrusion material having a target temperature with high accuracy.

  Extruded materials such as rubber sheet materials are used as materials for tires and other rubber products. In order to reduce such variations in the quality of the extruded material, it is necessary to appropriately manage the amount of heat history. For this purpose, for example, it is necessary to detect the temperature of the extruded material extruded from the extruder.

  By the way, since the dimension of the extruded material extruded from the extruder changes as it shrinks with time, the width dimension of the extruded material is conventionally detected by a sensor fixed in place for the width dimension. Based on the comparison between the size and the target size, the take-up speed of the extruded material extruded from the extruder is controlled to obtain an extruded material having the target size (for example, see Patent Document 1).

However, since the supply amount of the extruder changes according to the amount and speed required by the post-process, the take-up speed may be changed between batches or even in the same batch. Therefore, if the temperature of the extruded material is detected by a temperature sensor fixed at a fixed position as in the conventional width dimension detection method, the temperature of the extruded material is changed from the time when the extruded material is extruded from the extruder by changing the take-up speed. The pre-detection time up to the point of detection varies. If there is a difference in the pre-detection time, the temperature of the extruded material at the time of detecting the temperature also changes due to the change over time, and therefore the variation due to the change over time occurs between the detected temperatures when the take-up speed is different. . For this reason, this variation also affects the comparison between the detected temperature and the target temperature, making it difficult to control the appropriate temperature control means, and there has been a problem that an extruded material having the target temperature cannot be obtained with high accuracy.
JP-A-6-246817

  An object of the present invention is to provide an extrusion material temperature control method for an extruder that can always obtain an extrusion material at a target temperature with high accuracy even when the take-up speed of the extrusion material may be changed between batches or in the same batch. And providing an apparatus.

  In order to achieve the above object, an extrusion material temperature control method for an extruder according to the present invention detects a temperature of an extrusion material extruded from an extruder by a temperature sensor installed between the extruder and a take-up means, and An extrusion material temperature control method for an extruder that controls the temperature control means of the extruded material so that the temperature of the extruded material becomes a target temperature based on a temperature difference between a detected temperature and a preset target temperature, A pre-detection time from the time when the extruded material is extruded from the extruder to the time when the temperature sensor detects the temperature of the extruded material is set as a predetermined time in advance, and based on the pre-detection time and the take-up speed The detection position of the temperature sensor is changed.

  The extrusion material temperature control device for an extruder according to the present invention is provided with a temperature sensor for detecting the temperature of the extruded material extruded from the extruder between the extruder and the take-up means, and the temperature detected by the temperature sensor. And an extrusion material temperature control device for an extruder provided with a control device for controlling the temperature control means of the extrusion material so that the temperature of the extrusion material becomes a target temperature based on a temperature difference between the temperature of the extrusion material and a preset target temperature. The temperature sensor is provided so as to be capable of moving forward and backward in the extrusion direction of the extruded material, and a time before detection until the temperature of the extruded material is detected from the time when the extruded material is extruded from the extruder to the control device in advance. While being set as a fixed time, the take-up speed is input, and based on the pre-detection time and the take-off speed, the temperature sensor is moved to a detection position. .

  The extrusion material temperature control device for another extruder according to the present invention is provided with a temperature sensor for detecting the temperature of the extruded material extruded from the extruder between the extruder and the take-up means, and the temperature sensor Extrusion material temperature control device for an extruder provided with a control device for controlling the temperature control means of the extruded material so that the temperature of the extruded material becomes the target temperature based on a temperature difference between the detected temperature and a preset target temperature A plurality of the temperature sensors are arranged at predetermined intervals in the extrusion direction of the extruded material, and detection from the time when the extruded material is extruded from the extruder to the control device until the temperature of the extruded material is detected. The previous time is set as a predetermined time in advance, the take-off speed is input, and the temperature sensor corresponding to the detection position is selected from the plurality of temperature sensors based on the pre-detection time and the take-off time. Configured to And it is characterized in and.

  According to the present invention, the pre-detection time from the time when the extruded material is extruded from the extruder to the time when the temperature of the extruded material is detected by the temperature sensor is set in advance as a fixed time. The temperature sensor changes the detection position for detecting the temperature of the extruded material based on the take-off speed, so even if the take-up speed is changed between batches or in the same batch, the change with time is always the same. The temperature of the extruded material can be detected under the conditions. Therefore, it is possible to detect the temperature of the extruded material between the detected temperatures detected when the take-up speed is different so that there is no influence due to change over time, and accordingly, when comparing the detected temperature with the target temperature The influence of the aging of the extruded material is eliminated. Therefore, appropriate control can be performed when controlling the temperature control means of the extruded material, and the extruded material having the target temperature can be obtained with high accuracy.

  Hereinafter, an extrusion material temperature control method and apparatus for an extruder according to the present invention will be described based on the embodiments shown in the drawings.

  As illustrated in FIGS. 1 and 2, the extruded material temperature control device 1 of the first embodiment is disposed between an extruder 8 and a take-up conveyor 9. The extruder 8 has a screw shaft that is rotated by an electric motor (not shown), and a die formed in a cross-sectional shape of the extruded material R is attached to the extrusion port 8a. A temperature adjusting means 10 for adjusting the temperature of the extruded material R is provided inside or outside the extruder 8. Although this temperature control means 10 is not specifically limited, For example, it is comprised by the circulation line of a heater or cooling water. The take-up conveyor 9 places the extruded material R extruded from the extruder 8 on the conveyance surface and conveys it to a subsequent process.

  In this extruded material temperature control device 1, one end portion of a slide guide frame 5 extending in the extrusion direction of the extruded material R is fixed to the lower portion of the extrusion port 8 a of the rubber extruder 8. A temperature sensor 2 for detecting the temperature of the extruded material R is disposed on the upper surface of the slide guide frame 5, and this temperature sensor 2 is attached to a ball screw 3 having one end connected to a servo motor 4. The temperature sensor 2 is guided by the slide guide frame 5 by rotating the ball screw 3 by driving the servo motor 4, and advances and retreats in the axial direction of the ball screw 3 parallel to the extrusion direction of the extruded material R, and below the extruded material R. It is comprised so that it can arrange | position in the arbitrary positions of an extrusion direction.

  A detection signal from the temperature sensor 2 is input to the control device 7, and a control signal for controlling the temperature of the extruded material R is input from the control device 7 to the temperature adjusting means 10. The take-up speed data of the take-up conveyor 9 is input to the control device 7, and a control signal for controlling the rotation is input to the servo motor 4 from the control device 7.

  In addition, the pre-detection time from the time when the extruded material R is extruded from the extruder 8 to the time when the temperature of the extruded material R is detected by the temperature sensor 2 is set in advance as a predetermined time. Has been entered. Further, the target temperature of the extruded material R at the time of detecting the temperature of the extruded material R is set in advance, and this target temperature is input to the control device 7.

  Hereinafter, the extrusion material temperature control method by this extrusion material temperature control apparatus 1 is demonstrated. By operating the electric motor of the extruder 8 and rotating the screw shaft, the rubber material inside the extruder 8 becomes the extruded material R and is continuously extruded from the extrusion port 8a into a sheet shape. This extruded material R is placed on the transport surface of the take-up conveyor 9 and wound up in a roll shape, or directly transported to a subsequent process. The temperature of the extruded material R immediately after being extruded from the extrusion port 8a is, for example, about 70 ° C. to 100 ° C. and decreases as time elapses.

  Here, the control device 7 divides the pre-detection time by the take-off speed so as to be the input pre-detection time, so that the temperature sensor 2 detects the temperature of the extruded material R ( The position of the temperature sensor 2 from the extrusion port 8a is calculated. Next, a control signal is input from the control device 7 to the servo motor 4 so as to reach this detection position, and the servo motor 4 rotates in response to this to move the temperature sensor 2 to the detection position.

  The temperature sensor 2 disposed at the detection position detects, for example, the temperature of the extruded material R extruded from the extruder 8 at a predetermined time cycle of 0.1 to 2.0 seconds, and the detection signal is a control device. 7 and the detected temperature is calculated. This detected temperature is compared with the target temperature input in advance.

  Next, the control device 7 inputs a control signal to the temperature adjusting means 10 so that the temperature difference between the detected temperature and the target temperature is reduced and matched, and the heating or cooling state of the temperature adjusting means 10 is controlled by this control signal. The adjusted temperature is controlled to an appropriate temperature.

  For example, when the detected temperature is higher than the target temperature, the temperature of the extruded material R is lowered by controlling the heater temperature of the temperature adjusting means 10 to be lowered or increasing the circulation amount of the cooling water. When the detected temperature is lower than the target temperature, the opposite control is performed. In this way, an extruded material R having a target temperature can be obtained.

  In this extrusion process, the extrusion material R may be supplied by changing the take-up speed depending on the demand of the post-process even between batches or in the same batch. For example, when a large amount of extruded material R is required in a short time, the extruded material R is supplied at a higher take-up speed so as to correspond to this.

  When the take-up speed is changed, the control device 7 calculates a new detection position by dividing the pre-detection time by the changed take-up speed so that the set pre-detection time is reached. To do. Next, a control signal is input from the control device 7 to the servo motor 4 so as to become a new detection position, and the servo motor 4 rotates in response to this to move the temperature sensor 2 to the new detection position. For example, when the take-up speed is changed to twice, the temperature sensor 2 is moved so that the distance between the extrusion port 8a and the temperature sensor 2 is doubled, and the detection position is changed.

  Thus, even when the take-up speed is changed, the pre-detection time is always kept constant, so that the temperature can always be detected under the same conditions with respect to the change over time of the temperature of the extruded material R. Therefore, it is possible to detect the temperature of the extruded material R between the temperatures detected when the take-up speeds are different without being affected by the change with time, and accordingly, when the detected temperature is compared with the target temperature, the extrusion is also performed. The influence of the material R over time can be eliminated.

  Therefore, proper control can be performed without mistakes in the heating and cooling of the temperature adjusting means 10 of the extruded material R and the amount of temperature adjustment, and the extruded material R having the target temperature can be obtained with high accuracy. As described above, since the extruded material R is controlled to the target temperature, variation in the amount of heat history is reduced, and uniform predetermined quality can be maintained. Since the amount of heat history in the extrusion process can be appropriately managed, it is possible to easily calculate an appropriate amount of heat to be applied based on the amount of heat history when the extruded material R is heated after the extrusion process. Become.

  In the present invention, the extruded material R includes not only a rubber material but also a rubber material, a steel cord, an organic fiber, and the like.

  The sensor moving means is not limited to the one exemplified above as long as the temperature sensor 2 can be moved forward and backward in the extrusion direction of the extruded material R. In the above embodiment, the take-up conveyor 9 is illustrated as the take-up means for the extruded material R. However, it is sufficient that the extruded material R can be taken, and for example, a winding roller or the like is used.

  FIG. 3 shows a second embodiment of the extruded material temperature control apparatus 1. Unlike the first embodiment, the second embodiment has a plurality of temperature sensors 2a to 2d fixed at fixed positions. These temperature sensors 2a to 2d have one end fixed to the lower part of the extrusion port 8a, fixed to a fixed frame 6 disposed between the extruder 8 and the take-up conveyor 9, and in the extrusion direction of the extruded material R. They are arranged at a predetermined interval. Detection signals from the plurality of temperature sensors 2 a to 2 d are input to the control device 7.

  In this temperature control device 1, the control device 7 calculates the detection position based on the set pre-detection time and the take-up speed of the take-up conveyor 9, and also calculates from the plurality of temperature sensors 2 a to 2 d. One temperature sensor 2 corresponding to the detection position (closest position) is selected, and the detection temperature of the extruded material R is calculated using the detection signal of the selected temperature sensor 2. Next, the detected temperature is compared with the target temperature input in advance, and thereafter, the same control as in the first embodiment is performed to obtain the extruded material R having the target temperature.

  Thus, with the change of the take-off speed, the control device 7 changes the detection position by selecting one temperature sensor 2 corresponding to the detection position from among the plurality of fixed temperature sensors 2a to 2d. Therefore, a mechanism for moving the temperature sensor 2 is not required, and the configuration can be simplified.

  The number of the temperature sensors 2 to be arranged is not particularly limited, and the more the number of the temperature sensors 2 to be arranged, the more accurately the extruded material R having the target temperature can be obtained. .

  In this embodiment, a slight error occurs between the detection position calculated by the control device 7 and the position of the selected temperature sensor 2. In this case, the temperature of the extruded material R at the detection position is estimated by proportional calculation or the like, using the detection temperatures of the two adjacent temperature sensors 2 and 2 with the calculated detection position in between, and this may be used as the detection temperature. it can. Thereby, the precision of detection temperature can be raised.

It is a top view which illustrates 1st Embodiment of the extrusion material temperature control apparatus of this invention. It is an enlarged side view of a part of FIG. It is a top view which illustrates 2nd Embodiment of an extrusion material temperature control apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Extrusion material temperature control apparatus 2, 2a-2d Temperature sensor 3 Ball screw 4 Servo motor 5 Slide guide frame 6 Fixed frame 7 Control apparatus 8 Extruder 8a Extrusion port 9 Take-out conveyor 10 Temperature control means R Extrusion material

Claims (6)

  The temperature of the extruded material extruded from the extruder is detected by a temperature sensor installed between the extruder and the take-off means, and the temperature of the extruded material is determined based on the temperature difference between the detected temperature and a preset target temperature. An extrusion material temperature control method for an extruder that controls a temperature control means so that the temperature of the extruded material becomes a target temperature, wherein the temperature sensor detects the extrusion material from the time when the extruded material is extruded from the extruder. An extrusion material temperature control method for an extruder in which a pre-detection time until a temperature is detected is set as a predetermined time in advance, and the detection position of the temperature sensor is changed based on the pre-detection time and the take-up speed.   The extrusion material temperature control method for an extruder according to claim 1, wherein the change of the detection position is performed by movement of the temperature sensor.   The extruded material of the extruder according to claim 1, wherein the change of the detection position is performed by arranging a plurality of the temperature sensors at predetermined intervals in the extrusion direction of the extruded material and selecting from the plurality of temperature sensors. Temperature control method.   A temperature sensor for detecting the temperature of the extruded material extruded from the extruder is provided between the extruder and the take-up means, and the extrusion is performed based on a temperature difference between a temperature detected by the temperature sensor and a preset target temperature. An extrusion material temperature control device for an extruder provided with a control device for controlling temperature control means of the extruded material so that the temperature of the material becomes a target temperature, wherein the temperature sensor moves forward and backward in the extrusion direction of the extruded material Set as possible, and set the pre-detection time from the time when the extruded material is extruded from the extruder to the control device until the temperature of the extruded material is detected as a predetermined time, and input the take-up speed, An extrusion material temperature control device for an extruder configured to move to a detection position of the temperature sensor based on the pre-detection time and the take-up speed.   The extrusion material temperature control device for an extruder according to claim 4, wherein the moving means of the temperature sensor includes a servo motor and a ball screw driven by the servo motor.   A temperature sensor for detecting the temperature of the extruded material extruded from the extruder is provided between the extruder and the take-up means, and the extrusion is performed based on a temperature difference between a temperature detected by the temperature sensor and a preset target temperature. An extrusion material temperature control device for an extruder provided with a control device for controlling temperature control means of the extruded material so that the temperature of the material becomes a target temperature, wherein the temperature sensor is arranged at a predetermined interval in the extrusion direction of the extruded material. A plurality of pre-detection times from when the extruded material is extruded from the extruder to when the temperature of the extruded material is detected are set as a predetermined time and the take-up speed is input to the control device. And the extrusion material temperature control apparatus of the extruder comprised so that the temperature sensor applicable to a detection position might be selected from among these temperature sensors based on this pre-detection time and the said taking-off time.

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