JP5239528B2 - Rubber member extrusion supply method and apparatus - Google Patents

Description

  The present invention relates to a method and an apparatus for extruding and supplying a rubber member, and more specifically, according to a required speed of a subsequent process while suppressing a storage amount in a buffer portion without changing a cross-sectional shape of the extruded rubber member. The present invention relates to a rubber member extrusion supply method and apparatus capable of continuously supplying an extruded rubber member.

  In production processes of tires and other rubber products, a rubber member having a predetermined cross-sectional shape extruded by an extruder is used as a molding material. Here, while the extruded rubber member is kept continuous, the production efficiency can be improved by supplying it directly to the subsequent process, but even if the required speed for the rubber member changes due to a change in the production cycle of the subsequent process, It is necessary to supply the rubber member continuously. Therefore, in such a production line, a buffer unit for storing a certain amount of the extruded rubber member is provided so that the rubber member can be supplied without interruption even if the required speed of the subsequent process changes. However, the greater the change in the required speed for the rubber member in the subsequent process, the greater the amount of storage in the buffer portion, and it is difficult to reduce the amount of storage of the rubber member and make the buffer portion compact. It was.

  In addition, a method has been proposed in which the feeding speed of the calendar roll machine is changed during the scheduled change time, and the operation speed of the rubber extruder is changed to keep the size of the extruded rubber sheet constant (Patent Document). 1). Since there is a time lag between the change in the operating speed of the rubber extruder and the amount of rubber to be extruded, simply changing the feeding speed of the calendar roll machine and the operating speed of the rubber extruder linearly changes the rubber An excess or deficiency of the amount occurs, resulting in variations in the dimensions of the rubber sheet. Therefore, in the invention of the cited document 1, in order to solve the problem of the time lag, the change in the feeding speed of the calendar roll machine is matched with the change curve of the rubber amount to be extruded.

On the other hand, the extruded rubber member undergoes dimensional changes, such as shrinking after extrusion, and the head pressure has a large effect on this. However, in the invention of the cited document 1, the head pressure is not considered even though the operation speed (extrusion speed) of the rubber extruder is considered. That is, when various rubber members having different cross-sectional areas are extruded, even if the head pressure is different, the same control is performed as long as the extrusion speed is the same. Therefore, there is a problem that the dimensional stability of the extruded rubber member cannot be sufficiently ensured.
JP 2004-2468404 A

  An object of the present invention is to provide a rubber that can continuously supply an extruded rubber member according to a required speed in a subsequent process while suppressing a storage amount in a buffer portion without changing a cross-sectional shape of the extruded rubber member. An object of the present invention is to provide an extrusion supply method and apparatus for members.

In order to achieve the above object, the rubber member extrusion supply method of the present invention is a rubber member extrusion supply method in which a rubber member extruded from an extruder is continuously supplied to a subsequent process through a buffer portion. By grasping in advance the cross-sectional shape change of the extruded rubber member due to the relationship between the pressure and the drawing speed of the drawing roll arranged in front of the extrusion port of the extruder , the head pressure and the drawing speed are set in multiple stages , Based on the amount of storage in the buffer part of the rubber member, one head pressure and a drawing speed are selected from the plurality of stages, and the head pressure and the drawing speed are changed to change the supply speed of the rubber member, While the cross-sectional shape of the rubber member is kept constant, the rubber member is supplied in accordance with the required speed of the subsequent process.

The rubber member extrusion supply apparatus of the present invention includes a rubber member extruder and a buffer unit that is disposed between the extruder and a subsequent process and stores the extruded rubber member in a continuous manner. In the rubber member extrusion supply apparatus, a drawer roll disposed in front of the extrusion port of the extruder, a sensor for detecting a storage amount of the extruded rubber member in a buffer portion, driving of the extruder, and of the drawer roll A control device for controlling the drive and receiving the detection signal of the sensor, and the head pressure of the extruder that keeps the cross-sectional shape of the rubber member constant according to the supply speed to the subsequent process of the rubber member. and a combination of the withdrawal speed of the drawer rolls have entered previously set in a plurality of stages based on the detection signal of the sensor, of the combination of the previously entered head pressure and withdrawal rate Select et one head pressure and withdrawal rate, which is characterized in that the arrangement supplies the post-process of the rubber member by changing the feed rate of the rubber member by varying the head pressure and withdrawal rate It is.

  According to the present invention, the cross-sectional shape change of the extruded rubber member due to the relationship between the head pressure of the extruder and the drawing speed of the drawing roll is grasped in advance, and the rubber member A combination of the head pressure of the extruder that keeps the cross-sectional shape constant and the drawing speed of the drawing roll is previously input to the control device, and the detection signal of the sensor that detects the storage amount in the buffer portion of the rubber member is input to the control device. Based on this detection signal, the drive of the extruder and the drive of the drawing roll are controlled to set the combination of the head pressure and the drawing speed inputted in advance, and the supply speed of the rubber member is changed. Even if the required speed of the process changes, the cross-sectional shape of the extruded rubber member can be kept stable and constant.

  And since the change of the supply speed of this rubber member is performed based on the storage amount in the buffer part of the rubber member, the extruded rubber is controlled according to the required speed in the subsequent process while suppressing the storage amount in the buffer part. The members can be supplied continuously.

  Hereinafter, a rubber member extrusion supply method and apparatus according to the present invention will be described based on the embodiments shown in the drawings.

  As illustrated in FIG. 1, a rubber member extrusion supply device 1 (hereinafter referred to as a supply device 1) of the present invention is disposed between an extruder 2 for a rubber member R and between the extruder 2 and a molding drum 13. The buffer unit 9 is provided. In the molding drum 13, a molding operation is performed using the extruded rubber member R. Therefore, the molding process by the molding drum 13 is a post process with respect to the extrusion process by the extruder 2.

  The extruder 2 includes a screw shaft 3a that is rotated by driving an extrusion driving unit 3 such as an electric motor, and a head 4 at the tip is provided with an extrusion port 5 formed in a predetermined shape. The rubber material thrown into the hopper 6 is fed forward by the screw shaft 3a and is continuously extruded from the extrusion port 5 into a predetermined cross-sectional shape as a rubber member R.

  A drawer roll 8 is installed in the vicinity of the front of the extrusion port 5. The drawing roll 8 rotates by driving a roll driving unit 8a such as an electric motor. Driving of the roll driving unit 8 and the extrusion driving unit 3 is controlled by the control device 11. A pair of slit rollers 7 for cutting the rubber member R into a predetermined width is installed in front of the drawing roll 8.

  The buffer unit 9 includes a plurality of support rollers 9a attached to the support column 9b, and a guide 9c for guiding the rubber member R to the support roller 9a. A certain amount of the rubber member R is stored in the buffer unit 9 by loosening the rubber member R extruded on the support rollers 9 while being continuously stretched.

  Three sensors 10a, 10b, and 10c are fixed to the column 9b at different height positions. The sensors 10a, 10b, and 10c detect the presence or absence of the rubber member R at each height position, and the detection signal is input to the control device 11. Thereby, the storage amount of the rubber member R in the buffer part 9 can be detected based on the detection signals of the sensors 10a, 10b, and 10c. The number of support rollers 9a and sensors 10a, 10b, and 10c is not particularly limited. The control device 11 is inputted with a pressure sensor for detecting the head pressure and a detection signal of a speed sensor for detecting a drawing speed by the drawing roller 8.

  In this supply device 1, the rubber member R extruded by the extruder 2 is drawn out at a predetermined drawing speed V by the drawing roll 8, and is conveyed to the buffer unit 9 in a continuous state. The rubber member R conveyed to the buffer unit 9 is temporarily stored and then supplied to the molding drum 13 through the servicer 12. In this way, the rubber member R extruded from the extruder 2 is directly supplied to the molding drum 13 in the subsequent process in a state where the rubber member R continues through the buffer unit 9. If the cross-sectional area of the extrusion port 5 is constant, the extrusion speed of the rubber member R from the extrusion port 5 is proportional to the head pressure P, and the cross-sectional area of the extrusion port 5 is known. By controlling P, the extrusion speed of the rubber member R from the extrusion port 5 can be controlled.

  The size of the extruded rubber member R is greatly affected by the head pressure P of the extruder 2 and the drawing speed V of the drawing roll 8. Therefore, the cross-sectional shape change of the extruded rubber member R due to the relationship between the head pressure P and the drawing speed V is grasped in advance for various extruded cross-sectional areas (cross-sectional shapes) and various types of rubber materials by prior measurement or the like. deep. For example, as illustrated in FIG. 2, the relationship between the head pressure P and the drawing speed V that can keep the cross-sectional shape of the rubber member R constant according to the supply speed of the extruded rubber member R to the subsequent process is shown. A straight line (or curve) C is grasped.

Then, the control device 11 determines, based on the grasped data, the head pressure P that can keep the cross-sectional shape of the rubber member R constant for various supply speeds to the post-process of the extruded rubber member R. And a combination of the drawing speed V are input in advance. Here, the combination of the head pressure P and the drawing speed V that can keep the cross-sectional shape of the rubber member R constant is set in a plurality of stages, and this combination is input to the control device 11. In FIG. 2, as a combination of the head pressure P and the drawing speed V when extruding a certain type of rubber material with a certain extrusion cross-sectional area (cross-sectional shape), there are three stages: P1 and V1, P2 and V2, and P3 and V3. Is set.

  Hereinafter, the extrusion supply method of the rubber member using the supply device 1 will be described.

  As illustrated in FIG. 1, when the rubber member R is supplied in a continuous manner with respect to the production cycle of the post-process on the molding drum 13, for example, a reference storage amount is supplied to the buffer unit 9 as a reference storage amount. The amount of rubber member R used in one cycle is stored. In the subsequent process, even in the same production cycle, the required speed for the rubber member R changes due to a temporary emergency stop or a difference in the work efficiency of the worker. Of course, the required speed for the rubber member R changes in order to produce products with different specifications in different production cycles. Corresponding to the change in the required speed in the subsequent process, the amount of storage of the rubber member R in the buffer unit 9 also changes.

  In the present invention, each sensor 10a, 10b, 10c provided in the buffer unit 9 detects the presence or absence of the rubber member R, and the amount of storage of the rubber member R in the buffer unit 9 is calculated by the control device 11 based on the detection signal. Is done. The calculated storage amount is compared with a preset reference storage amount, and when the reference storage amount is exceeded, control is performed to reduce the storage amount, and when the reference storage amount is not satisfied, Control is performed to increase the amount of storage.

  When reducing the storage amount of the rubber member R, the supply speed of the rubber member R extruded from the extruder 2 is decreased. On the other hand, when the storage amount of the rubber member R is increased, the supply speed of the rubber member R extruded from the extruder 2 is increased. In this way, the storage amount of the rubber member R in the buffer unit 9 is automatically maintained at a substantially constant amount (reference storage amount). Therefore, even if the required speed for the rubber member R in the subsequent process changes, the amount of storage in the buffer unit 9 can be suppressed, and the buffer unit 9 can be made compact.

  The supply speed of the extruded rubber member R is changed by changing the head pressure P and the drawing speed V so that the cross-sectional shape of the rubber member R is not changed. For example, when only the upper position sensor 10a detects that the rubber member R is present, since the storage amount is insufficient, control is performed so as to set a combination of the high head pressure P3 and the high withdrawal speed V3. The apparatus 11 controls the extrusion drive unit 3 and the roll drive unit 8a. If only the upper position sensor 10a and the middle position sensor 10b detect that the rubber member R is present, the amount of storage is appropriate, so that the combination of the normal head pressure P2 and the medium drawing speed V2 is set. When all the sensors 10a, 10b, and 10c detect that the rubber member R is present, the amount of storage is excessive, so that the combination of the low-pressure head pressure P1 and the low-speed drawing speed V1 is set.

  When the supply speed of the rubber member R is changed, if the head pressure P and the drawing speed V are changed at the same timing, the change in the drawing speed V precedes the change in the cross-sectional shape of the rubber member R. Therefore, the timing for changing the drawing speed V is relatively delayed so that the cross-sectional shape of the rubber member R is kept constant.

  Since the head pressure P and the drawing speed V are changed in this way, even when various rubber members having different cross-sectional areas are extruded, the cross-sectional shape of the extruded rubber member R is not changed, and the required speed of the subsequent process can be achieved. Accordingly, the rubber member R can be continuously supplied. That is, even if the required speed for the rubber member R in the post process changes, the rubber member R that is continuous without excess or deficiency can be supplied to the post process while keeping the cross-sectional shape of the rubber member R stable and constant.

  In the present invention, for example, a unit for setting the target head pressure and the target drawing speed and the time required to reach them and changing the head pressure P and the drawing speed V to the target head pressure and the target drawing speed, respectively. The amount of change per hour can also be set as the target value. Then, when changing the head pressure P and the drawing speed V, the arrival time is subdivided, the target value is compared with the current change amount for each subdivided minute time, and the head pressure is multi-stepped. P and the drawing speed V can be changed.

It is a side view which illustrates the extrusion supply apparatus of the rubber member of this invention. It is a graph which illustrates the relationship between the head pressure which keeps the cross-sectional shape of a rubber member constant, and drawing-out speed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Extruder supply apparatus of rubber member 2 Extruder 3 Extrusion drive part 3a Screw shaft 4 Head 5 Extrusion port 6 Hopper part 7 Slit roller 8 Pull-out roll 8a Roll drive part 9 Buffer part 9a Support roller 9b Support | pillar 9c Guide 10a, 10b, 10c Sensor 11 Control device 12 Servicer 13 Molding drum R Rubber member

Claims (2)

In a rubber member extrusion supply method in which a rubber member extruded from an extruder is continuously supplied to a subsequent process through a buffer portion, the head pressure of the extruder and the drawing speed of a drawing roll disposed in front of the extrusion port of the extruder The cross-sectional shape change of the extruded rubber member due to the relationship between the head member and the drawing speed is set in a plurality of steps, and the plurality of steps are determined based on the storage amount of the rubber member in the buffer unit . One of the head pressure and the drawing speed is selected from the above, and the head pressure and the drawing speed are changed to change the supply speed of the rubber member. A method for extruding and supplying a rubber member that is supplied together. In a rubber member extrusion supply apparatus comprising a rubber member extruder and a buffer unit that is disposed between the extruder and a subsequent process and stores the extruded rubber member in a continuous manner, the pusher of the extruder is provided. A drawer roll arranged in front of the outlet, a sensor for detecting the amount of rubber stored in the buffer of the extruded rubber member, the drive of the extruder and the drive of the drawer roll are controlled, and the detection signal of the sensor is input The control device has a plurality of stages of combinations of the extruder head pressure and the drawing roll drawing speed that keep the cross-sectional shape of the rubber member constant according to the supply speed of the rubber member to the subsequent process. set to have entered beforehand, based on a detection signal of the sensor, to select the inner shell one head pressure and withdrawal rate of the combination of the previously entered head pressure and withdrawal rate To, extrusion supply device of the rubber member in the configuration supplied to the subsequent process by changing the supply rate of the rubber member the rubber member by varying the head pressure and withdrawal rate.

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