JP2007301921A - Extrusion-material dimension control method and device for extruder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an extrusion-material dimension control method and a device for an extruder that enable to always highly-accurately obtain an extrusion material with a target-dimension width even when changing a take-up speed of the extrusion material between batches or in the same batch. <P>SOLUTION: It is composed so as to set a time before detection from the time point when the extrusion material R is extruded from the extruder 8 until the time point of detecting a width dimension of the extrusion material R by a dimension sensor 2 as a fixed time beforehand. A detection position where the dimension sensor 2 detects the width dimension is calculated by a controller 7 on the basis of the time before detection and the take-up speed of the extrusion material R so as to move the dimension sensor 2 to the calculated detection position by a ball screw 3 while controlling a servomotor 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an extrusion material size control method and apparatus for an extruder, and more specifically, in an extruder such as a rubber sheet material, even when 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 dimension control method and apparatus for an extruder that can always obtain an extrusion material having a width of a target dimension with high accuracy.

  Extruded materials such as rubber sheet materials are used as materials for tires and other rubber products. Conventionally, the size of such extruded material changes as it shrinks over time from immediately after being extruded from the extruder, so the size of the extruded material (mainly the width) is detected by a sensor fixed in place. Based on the comparison between the detected 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, when the dimension sensor is in a fixed position and the dimension of the extruded material is detected as in the prior art, the pre-detection time from the time when the extruded material is pushed out of the extruder by the change of the take-up speed to the time when the dimension is detected. fluctuate. If there is a difference in the time before detection, the size of the extruded material at the time of detecting the size also changes due to change over time. Therefore, when the take-up speed is different, the detected size varies due to change over time. . For this reason, this variation also affects the comparison between the detected dimension and the target dimension, making it difficult to control the proper take-up speed, resulting in a problem that the extruded material having the target dimension cannot be obtained with high accuracy.
JP-A-6-246817

  An object of the present invention is to provide an extrusion material size of an extruder that can always obtain an extrusion material having a target width with high accuracy even when the take-up speed of the extrusion material is changed between batches or in the same batch. It is to provide a control method and apparatus.

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

  In the extrusion material size control apparatus for an extruder according to the present invention, a size sensor for detecting the width size of the extruded material extruded from the extruder is provided between the extruder and the take-off means, and the detection by the size sensor is performed. Extruder size control device for an extruder provided with a control device for controlling the take-up speed of the take-up means so that the width of the extrudate becomes a target size based on a dimensional difference between a dimension and a preset target size The dimension sensor is provided so as to be movable back and forth in the extrusion direction of the extruded material, and a time before detection until the width dimension is detected from the time when the extruded material is extruded from the extruder in the control device. A predetermined time is set in advance, and the take-up speed is input, and based on the pre-detection time and the take-up speed, it is configured to move to the detection position of the dimension sensor. is there.

  According to another aspect of the present invention, there is provided an extrusion material dimension control device for an extruder, wherein a dimension sensor for detecting a width dimension of the extrusion material extruded from the extruder is provided between the extruder and the take-off means. Extruder dimensions of an extruder provided with a control device for controlling the take-up speed of the take-up means so that the width of the extrudate becomes a target dimension based on a dimensional difference between a detected dimension by a predetermined target dimension and a preset target dimension A control device, wherein a plurality of the dimension sensors are arranged at a predetermined interval in the extrusion direction of the extruded material, and from the time when the extruded material is extruded from the extruder to the control device until the width dimension is detected. A time before detection is set as a predetermined time in advance, the take-up speed is input, and a dimension sensor corresponding to a detection position is selected from the plurality of dimension sensors based on the pre-detection time and the take-off time. Configure to select It is characterized in that the.

  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 width sensor detects the width dimension is set in advance as a predetermined time, and this pre-detection time and the take-up speed of the extruded material Therefore, even if the take-up speed is changed between batches or in the same batch, the width is always changed under the same aging condition. Dimension can be detected. Therefore, it is possible to detect the width dimension of the extruded material so that there is no influence due to aging between the detected dimensions detected when the take-up speed is different, and accordingly, when comparing the detected dimension with the target dimension Also, the influence of the aging of the extruded material is eliminated. Therefore, appropriate control can be performed when controlling the take-up speed, and an extruded material having a width of the target dimension can be obtained with high accuracy.

  Hereinafter, an extrusion material size 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 size 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. 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 the extruded material size 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 dimension sensor 2 for detecting the width dimension of the extruded material R is disposed on the upper surface of the slide guide frame 5, and this dimension sensor 2 is attached to a ball screw 3 having one end connected to a servo motor 4. The dimension sensor 2 is guided by the slide guide frame 5 by rotating the ball screw 3 by driving the servo motor 4, 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 of the dimension sensor 2 is input to the control device 7, and a control signal for controlling the take-up speed is input from the control device 7 to the take-up conveyor 9. 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.

  Further, a pre-detection time from the time when the extruded material R is extruded from the extruder 8 to the time when the width sensor detects the width dimension is set in advance as a predetermined time, and this pre-detection time is input to the control device 7. ing. Further, a target dimension of the extruded material R at the time of detecting the width dimension is set in advance, and this target dimension is input to the control device 7.

  Hereinafter, the extrusion material dimension control method by this extrusion material dimension 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 extruded material R contracts immediately after being extruded from the extrusion port 8a until it is stabilized, and some of the extruded material R expands, and the width dimension of the extruded material R changes with time. .

  Here, the control device 7 divides the pre-detection time by the take-up speed so that the input pre-detection time is reached, so that the dimension sensor 2 detects the width dimension of the extruded material R. (The position of the dimension 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 dimension sensor 2 to the detection position.

The dimension sensor 2 arranged at the detection position detects the width dimension of the extruded material R extruded from the extruder 8 at a predetermined time cycle of, for example, 1 × 10 ⁻³ seconds to 1 second intervals, and the detection signal is The detection dimension is calculated by inputting to the control device 7. This detected dimension is compared with a target dimension input in advance.

  Next, the control device 7 inputs a control signal to the take-up conveyor 9 so as to make the difference between the detected size and the target size smaller, and the control signal rotates the drive motor (not shown) of the take-up conveyor 9 by this control signal. The speed is controlled and the take-up speed is controlled to an appropriate speed.

  For example, when the detected dimension is larger than the target dimension, the take-up speed is controlled to increase the tension on the extruded material R to reduce the width dimension. When the detected dimension is smaller than the target dimension, the opposite control is performed. In this way, an extruded material R having a target dimension (width dimension) 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 dimension sensor 2 to the new detection position. For example, when the take-up speed is changed to double, the dimension sensor 2 is moved so that the distance between the extrusion port 8a and the dimension sensor 2 is halved, 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 width dimension can always be detected under the same conditions with respect to the temporal change of the width dimension of the extruded material R. it can. Therefore, it is possible to detect the width dimension of the extruded material R without being affected by the change with time between the dimensions to be detected when the take-up speed is different, and accordingly, when comparing the detected dimension with the target dimension. The influence of the aging of the extruded material R can be eliminated.

  Therefore, it is possible to perform appropriate control without erroneously accelerating and decelerating the take-up speed, and the amount of increase / decrease, and it is possible to accurately obtain the extruded material R having the width of the target dimension.

  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. In the case of the extruded material R composed only of rubber, the dimensional change with time is large, and the width dimension is likely to change according to the take-up speed. Therefore, by applying the present invention, a greater effect can be obtained. .

  The sensor moving means is not limited to the one exemplified above as long as it can move the dimension sensor 2 in the pushing 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 size control apparatus 1. Unlike the first embodiment, the second embodiment has a plurality of dimension sensors 2a to 2d fixed at fixed positions. These dimension sensors 2a to 2d have one end fixed to the lower portion 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 dimension sensors 2 a to 2 d are input to the control device 7.

  In this dimension 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 a plurality of size sensors 2a to 2d. One dimension sensor 2 corresponding to the detection position (closest position) is selected, and the detection dimension of the extruded material R is calculated using the detection signal of the selected dimension sensor 2. Next, the detected dimension is compared with the target dimension input in advance, and thereafter, the same control as in the first embodiment is performed to obtain the extruded material R having the target dimension.

  As described above, with the change in the take-up speed, the control device 7 selects one of the dimension sensors 2 corresponding to the detection position from the plurality of fixed dimension sensors 2a to 2d and changes the detection position. Therefore, a mechanism for moving the dimension sensor 2 is unnecessary, and the configuration can be simplified.

  The number of dimension sensors 2 to be arranged is not particularly limited, and the larger the number, the more accurately the extruded material R having a target dimension 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 dimension sensor 2. In this case, it is also possible to estimate the width dimension at the detection position by proportional calculation or the like using the detection dimensions of the two adjacent dimension sensors 2 and 2 with the calculated detection position in between, and use this as the detection dimension. Thereby, the precision of a detection dimension can be raised.

It is a top view which illustrates 1st Embodiment of the extrusion material dimension 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 dimension control apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Extrusion material dimension control apparatus 2, 2a-2d Dimension 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 R Extrusion material

Claims (6)

  The width dimension of the extruded material extruded from the extruder is detected by a dimension sensor installed between the extruder and the take-off means, and the take-off is performed based on a dimensional difference between the detected dimension and a preset target dimension. An extrusion material dimension control method for an extruder that controls the take-up speed of the means so that the width of the extrusion material becomes a target dimension, wherein the dimension sensor is a width from the time when the extrusion material is extruded from the extruder. An extrusion material dimension control method for an extruder in which a pre-detection time until a dimension is detected is set as a predetermined time in advance, and the detection position of the dimension sensor is changed based on the pre-detection time and the take-up speed.   The extrusion material size control method for an extruder according to claim 1, wherein the change of the detection position is performed by movement of the size sensor.   The extrusion material of the extruder according to claim 1, wherein the change of the detection position is performed by arranging a plurality of the dimension sensors at predetermined intervals in the extrusion direction of the extrusion material and selecting from the plurality of dimension sensors. Dimension control method.   A dimension sensor for detecting the width dimension of the extruded material extruded from the extruder is provided between the extruder and the take-up means, and based on a dimension difference between a dimension detected by the dimension sensor and a preset target dimension. An extrusion material size control device for an extruder provided with a control device for controlling the take-up speed of the take-up means so that the width of the extrusion material becomes a target size, wherein the dimension sensor is set in the extrusion direction of the extrusion material. It is provided so as to be able to move forward and backward, and a pre-detection time from when the extruded material is extruded from the extruder to the detection of the width dimension is set as a predetermined time in the control device, and the take-up speed is input. An extrusion material size control device for an extruder configured to move to a detection position of the size sensor based on the pre-detection time and the take-up speed.   5. The extrusion material size control apparatus for an extruder according to claim 4, wherein the moving means of the dimension sensor is composed of a servo motor and a ball screw driven by the servo motor.   A dimension sensor for detecting the width dimension of the extruded material extruded from the extruder is provided between the extruder and the take-up means, and based on a dimension difference between a dimension detected by the dimension sensor and a preset target dimension. An extrusion material size control device for an extruder provided with a control device for controlling the take-up speed of the take-up means so that the width of the extrusion material becomes a target size, wherein the dimension sensor is set in the extrusion direction of the extrusion material. A plurality of predetermined intervals are provided, and the control device sets a pre-detection time from when the extruded material is extruded from the extruder to the detection of the width dimension as a predetermined time, and sets the take-up speed. An extrusion material size control device for an extruder, configured to input and select a size sensor corresponding to a detection position from the plurality of size sensors based on the pre-detection time and the take-off time.

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