JP2019034499A - Rolling apparatus for rubber material and method of manufacturing tire - Google Patents

Abstract

To provide a rolling apparatus for a rubber material and a method of manufacturing a tire that prevent an excessive adhesion of the rubber material to a rolling roll and efficiently perform a rolling process to contribute to improvement in productivity.SOLUTION: In a rolling process in which an unvulcanized rubber material R is passed through a gap between rolling rolls 2a and 2b with circumferential surfaces facing each other and rolled into a sheet, a silicon amount of a circumferential surface 2S of each of the rolling rolls 2a and 2b is detected by a silicon sensor 4, and cleaning means 6 is operated by a control unit 7 with respect to the rolling rolls 2a and 2b in which the detected amount of silicon becomes equal to or more than a preset reference value C, so that by cleaning the circumferential surfaces 2S of the rolling rolls 2a and 2b, the amount of silicon adhering is reduced to make it easy to peel off the rubber material R from the rolling rolls 2a and 2b.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a rubber material rolling device and a tire manufacturing method. More specifically, the rubber material can be prevented from excessively adhering to a rolling roll, and a rolling process can be efficiently performed, thereby contributing to improvement in productivity. The present invention relates to a rubber material rolling device and a tire manufacturing method.

  When manufacturing rubber products such as tires, there is a rolling process in which an unvulcanized rubber material is rolled into a sheet. In the rolling process, a rubber material is passed between rolling rolls to form a sheet (for example, see Patent Document 1). Unvulcanized rubber materials are highly sticky and cannot be rolled if they remain in close contact with the rolling roll. Therefore, in the invention described in Patent Document 1, by adjusting the temperature of the rolling roll, the rubber material is easily separated from the rolling roll to prevent adhesion. Alternatively, a scraper is installed to peel off the rubber material in close contact with the rolling roll.

  However, the rubber material may not be sufficiently separated from the rolling roll only by adjusting the temperature of the rolling roll. In particular, when a rubber material containing silicon is rolled, it becomes easy to adhere to the rolling roll. Even if a scraper is installed, a large amount of rubber material is wound around the scraper. Therefore, it is necessary to frequently stop the rolling equipment and remove the rubber material from the rolling roll and scraper. Along with this, the efficiency of the rolling process is lowered, which becomes a factor of reducing the productivity of rubber products.

JP2011-224935A

  An object of the present invention is to provide a rubber material rolling device and a tire manufacturing method that can prevent excessive adhesion of a rubber material to a rolling roll, perform a rolling process efficiently, and contribute to productivity improvement. It is in.

  In order to achieve the above object, the rubber material rolling apparatus of the present invention has a rolling roll that is disposed with the circumferential surfaces facing each other with a gap therebetween, and the unvulcanized rubber material is passed through the gap. In the rubber material rolling apparatus, the silicon sensor for detecting the silicon amount on the peripheral surface of each rolling roll, the cleaning means for cleaning the peripheral surface of each rolling roll, and the detection data by the silicon sensor An input control unit, and for the rolling roll in which the silicon amount detected by the silicon sensor is equal to or greater than a preset reference value, the control unit operates the cleaning unit to perform cleaning. It is characterized in that it is configured to issue a command to be performed.

  The tire manufacturing method of the present invention is characterized in that a green tire is molded using the rubber material rolled by the rubber material rolling apparatus and the green tire is vulcanized.

  According to the rolling apparatus for rubber material of the present invention, the amount of silicon adhering is reduced by cleaning the peripheral surface of the rolling roll whose peripheral surface detected by the silicon sensor is equal to or higher than the reference value. be able to. Along with this, the rubber material is easily peeled off from the rolling roll. Therefore, it is possible to avoid an unexpected situation where the rubber material is excessively adhered to the rolling roll and rolling cannot be performed. Moreover, since it is possible to avoid cleaning the rolling roll more frequently than necessary, it is possible to minimize the time for stopping the rolling process for cleaning, and the rolling process can be performed efficiently. .

  The tire manufacturing method of the present invention is advantageous in improving tire productivity because the tire is manufactured using the rubber material efficiently rolled by the rolling apparatus.

It is explanatory drawing which illustrates the rolling apparatus of the rubber material of this invention by a side view. It is explanatory drawing which illustrates the rolling apparatus of FIG. 1 by planar view. It is a flowchart which illustrates the procedure of a rolling process. It is a graph which illustrates typically the time-dependent change of the silicon amount of the surrounding surface of the rolling roll of FIG. It is explanatory drawing which illustrates the state which is cleaning the rolling roll of FIG. 1 by a side view.

  Hereinafter, a rubber material rolling device and a tire manufacturing method of the present invention will be described based on the embodiments shown in the drawings.

  The rolling apparatus 1 of the rubber material of the present invention illustrated in FIGS. 1 to 2 has a plurality of rolling rolls 2 (2a, 2b) arranged with the circumferential surfaces 2S facing each other with a gap. The unvulcanized rubber material R passes through the gap between the rolling rolls 2 and is rolled into a sheet shape.

  The present invention has been created by grasping the correlation between the amount of silicon adhering to the peripheral surface 2S of the rolling roll 2 and the adhesiveness of the rubber material to the peripheral surface 2S. That is, as the amount of silicon adhering to the peripheral surface 2S increases, the inventor of the present application knows that the rubber material R adheres excessively to the rolling roll 2 and is difficult to peel off. The present invention was created based on the results.

  Therefore, the rolling device 1 includes a silicon sensor 4 that detects the amount of silicon on the peripheral surface 2S of each rolling roll 2, a cleaning unit 6 that cleans the peripheral surface 2S of each rolling roll 2, and a silicon sensor 4. And a control unit 7 to which detection data is input. In this embodiment, the rolling device 1 further includes a confirmation sensor 5. The confirmation sensor 5 is arranged close to each rolling roll 2. Further, conveyance conveyors 8 a and 8 b are installed adjacent to the front and rear of the rolling roll 2.

  Each rolling roll 2 is rotationally driven by a driving unit 3 such as a motor. The operations of the respective rolls 2 and the conveyors 8a and 8b are controlled by the control unit 7.

  The silicon sensor 4 is disposed in the vicinity of the peripheral surface 2S of each rolling roll 2. Each silicon sensor 4 has a specification capable of quantitatively measuring the silicon amount of the peripheral surface 2S of each rolling roll 2 in a non-contact manner. As the silicon sensor 4, for example, a fluorescent X-ray analyzer capable of analyzing an element attached to the peripheral surface 2 </ b> S is used. The silicon sensor 4 is communicably connected to the control unit 7, and detection data from the silicon sensor 4 is sequentially input to the control unit 7.

  The confirmation sensor 5 detects whether or not the rubber material R remains on the peripheral surface 2S of each rolling roll 2. As the confirmation sensor 5, for example, a laser sensor, a thermography, a camera device, or the like can be used. The confirmation sensor 5 is communicably connected to the control unit 7, and data detected by the confirmation sensor 5 is input to the control unit 7.

  The cleaning means 6 should just be what can remove the silicon adhering to the surrounding surface 2S of each rolling roll 2. FIG. In this embodiment, the cleaning means 6 includes an abrasive supply unit 6 a that supplies the abrasive P to the peripheral surface 2 </ b> S of each rolling roll 2, and the abrasive P that is supplied to the peripheral surface of each rolling roll 2. And a pressing portion 6b that presses against the peripheral surface 2S of the rolling roll 2. As the abrasive P, powdered alumina, sand, or the like can be used. The abrasive P can be supplied to the peripheral surface 2S in a powder state, but it is preferable to supply the abrasive P in a state of being mixed with moisture in order to prevent scattering.

  As the cleaning means 6, for example, a rotating brush or the like in which a large number of brush wires protrude from the shaft core portion can also be used. For example, it is also possible to use a specification in which an abrasive P is attached to a brush wire. Or it can also be set as the structure which combines the rotary brush and the abrasive | polishing agent supply part 6a.

  The control unit 7 operates the cleaning unit 6 and the drive unit 3 based on the detection data from the silicon sensor 4 and the confirmation sensor 5. The control unit 7 is inputted with a preset reference value C of the silicon amount. This reference value C is an upper limit value of the amount of silicon that can ensure a state in which the rubber material R is not excessively adhered to the peripheral surface 2S of the rolling roll 2 and is smoothly peeled off. This reference value C is obtained by rolling the rubber material R with the rolling roll 2 and grasping in advance the relationship between the amount of silicon adhering to the peripheral surface 2S and the adhesiveness of the rubber material R to the peripheral surface 2S at that time. And set to an appropriate value.

  Further, a cleaning target value G lower than the reference value C is input to the control unit 7 in advance. This cleaning target value G is an index of the amount of silicon in the peripheral surface 2S after the rolling roll 2 is cleaned. As the cleaning target value G is set to a low value, the amount of silicon adhering to the peripheral surface 2S after cleaning decreases, but the cleaning time increases. Therefore, the cleaning target arrival G is set to an appropriate value in consideration of the cleaning condition and the cleaning time.

  Hereinafter, the procedure of the rolling process of the rubber material R using the rolling device 1 of the present invention will be described based on the flowchart illustrated in FIG.

  As illustrated in FIG. 1, the unvulcanized rubber material R kneaded by a kneading machine such as a Banbury mixer is transported by the transport conveyor 8 a on the upstream side and is put into a gap between the rolling rolls 2. This rubber material R contains silicon. When the rubber material R is a silica-based compound, the silicon content is high.

  The respective rolling rolls 2 are driven to rotate in directions opposite to each other, and the rubber material R passes through the gaps of the rolling rolls 2 from above to below. In the process of passing, the rubber material R is sandwiched between the peripheral surfaces 2S of the respective rolling rolls 2 and rolled into a sheet shape. The rolled rubber material R is transported to a subsequent process by the transport conveyor 8b on the downstream side.

  In the rolling process, for example, a plurality of batches of the rubber material R are continuously rolled. In the rolling process performed continuously, not only the rubber material R having the same specification but also the rubber material R having a different specification may be switched on the way.

  By repeating the rolling process, silicon is gradually accumulated on the peripheral surface 2S of the rolling roll 2 as illustrated in FIG. Therefore, in the present invention, the silicon sensor 4 sequentially detects the silicon amount of the peripheral surface 2S of each rolling roll 2. The control unit 7 sequentially compares the input detection data (detected silicon amount) of the silicon sensor 4 with the reference value C. When the detected silicon amount becomes equal to or higher than the reference value C, the control unit 7 operates the cleaning means 6 to clean the rolling roll 2 whose peripheral surface 2S has the silicon amount equal to or higher than the reference value C. Give a command to do.

  Here, in this embodiment, the confirmation sensor 5 detects whether or not the rubber material R remains on each rolling roll 2. When the confirmation sensor 5 detects that the rubber material R does not remain on the rolling roll 2, the cleaning command issued by the control unit 7 is maintained as it is, and the cleaning means 6 is operated to operate the rolling roll 2. The cleaning of the peripheral surface 2S is started.

  On the other hand, when the confirmation sensor 5 detects that the rubber material R remains on the rolling roll 2, the cleaning command issued by the control unit 7 is suspended, and cleaning is started without operating the cleaning means 6. do not do. In this case, the rubber material R remaining on the rolling roll 2 is removed from the rolling roll 2 by moving, for example, downstream. Thereby, the confirmation sensor 5 detects that the rubber material R does not remain on the rolling roll 2, and the holding of the cleaning command issued by the control unit 7 is released, and the cleaning unit 6 is operated to start cleaning. To do.

  When the confirmation sensor 5 is not provided in the rolling apparatus 1, it is confirmed whether or not the rubber material R remains on each rolling roll 2 by visual observation or the like by an operator. And when the rubber material R does not remain in each rolling roll 2, the cleaning means 6 is operated and the cleaning of the peripheral surface 2S of the rolling roll 2 is started. Providing the confirmation sensor 5 as in this embodiment is advantageous for reliably avoiding the problem of cleaning the peripheral surface 2S while the rubber material R remains on the rolling roll 2.

  In this embodiment, as illustrated in FIG. 5, when cleaning the rolling roll 2, the abrasive P is supplied from the abrasive supply unit 6 a to the peripheral surface 2 </ b> S of the target rolling roll 2. The supply of the abrasive P may be in a state where the rolling roll 2 is rotated or stopped. The abrasive P can be sprayed or applied to the peripheral surface 2S.

  Then, the abrasive P is pressed against the circumferential surface 2S of the rolling roll 2 by moving the pressing portion 6b close to the circumferential surface 2S of the rolling roll 2 from the standby position and rotationally driving the rolling roll 2. Thereby, the peripheral surface 2S of the rolling roll 2 is grind | polished with the abrasive | polishing agent P, and the silicon adhering to the peripheral surface 2S is removed. A fiber material or the like that can hold the abrasive P mixed with moisture can be provided on the pressing surface of the pressing portion 6b.

  When using the rotary brush mentioned above as the cleaning means 6, the rolling roll 2 is rotationally driven in the state which contact | abutted the front-end | tip part of the brush wire to the surrounding surface 2S of the rolling roll 2. FIG. Thereby, the silicon | silicone which the rotating brush rotated and adhered to the surrounding surface 2S is removed with a brush wire. At this time, the rotating brush can be rotated while supplying the abrasive P from the abrasive supply part 6a to the peripheral surface 2S.

  By performing the cleaning by the cleaning means 6, the silicon amount of the peripheral surface 2S of the rolling roll 2 decreases as illustrated in FIG. The silicon amount of the peripheral surface 2S is sequentially detected by the silicon sensor 4. When the silicon amount detected by the silicon sensor 4 becomes equal to or less than the cleaning target value G, the control unit 7 issues a command to stop the cleaning by the cleaning unit 6 and ends the cleaning. Thereafter, the rolling process is resumed.

  The detection position with respect to the circumferential surface 2S by the silicon sensor 4 may be a specific position in the width direction of the rolling roll 2, but it is desirable to detect the silicon amount at a plurality of positions with different width directions. Moreover, in this embodiment, when the silicon amount of one circumferential surface 2S of the paired rolling rolls 2 is equal to or greater than the reference value C, the circumferential surface S of both rolling rolls 2a and 2b is cleaned by the cleaning means 6. It is the composition which becomes. The present invention is not limited to this configuration, and only the rolling roll 2 in which the silicon amount of the peripheral surface 2S is equal to or greater than the reference value C (for example, only one rolling roll 2a) can be targeted for cleaning.

  As described above, according to the rolling device 1 of the present invention, the peripheral surface 2S detected by the silicon sensor 4 adheres to the rolling roll 2 having the silicon amount equal to or greater than the reference value C by cleaning the peripheral surface 2S. It is possible to reduce the amount of silicon. Along with this, the rubber material R is easily peeled off from the peripheral surface 2S of the rolling roll 2. Therefore, it is possible to avoid an unexpected situation in which the rubber material R is excessively adhered to the rolling roll 2 and rolling cannot be performed.

  Moreover, according to the rolling apparatus 1 of this invention, it is not necessary to clean the rolling roll 2 regularly, and the rolling roll 2 can be cleaned only when cleaning needs arise. Therefore, the frequency of cleaning the rolling roll 2 is reduced, and the time for stopping the rolling process for cleaning can be minimized. Therefore, it is advantageous to perform the rolling process efficiently.

  The rolling apparatus having the same structure as the rolling apparatus 1 illustrated in FIGS. 1 and 2 is used to repeatedly roll the silicon-containing rubber material, and before and after cleaning the peripheral surface 2S by the rolling means. The adhesiveness (that is, peelability) to the peripheral surface 2S was confirmed. After cleaning, the amount of silicon adhering to the peripheral surface 2S was halved after cleaning. As a result, it has been confirmed that the adhesive strength of the rubber material to the peripheral surface 2S is substantially halved after cleaning compared to before cleaning.

  The rolling device 1 of the present invention can be applied not only when the rubber material R containing silicon is rolled. Even when the rubber material R not containing silicon is rolled, if the rubber material R containing silicon is rolled by the rolling device 1 before rolling the rubber material R, the rolling roll 2 Silicon adheres to the peripheral surface 2S. Therefore, the rubber material R not containing silicon may be difficult to peel from the rolling roll 2. Therefore, the rolling apparatus 1 of the present invention is also useful when rolling the rubber material R not containing silicon. "

  The tire manufacturing method of the present invention forms a green tire using the rubber material R rolled by the rolling device 1 described above. Next, the tire is manufactured by vulcanizing the green tire in a vulcanizing mold by an existing method. In the rolling apparatus 1, the rubber material R is efficiently rolled, and this is advantageous in improving the productivity of green tires and consequently vulcanized tires.

DESCRIPTION OF SYMBOLS 1 Rolling apparatus 2 (2a, 2b) Roll 2S Circumferential surface 3 Drive part 4 Silicon sensor 5 Confirmation sensor 6 Cleaning means 6a Abrasive supply part 6b Press part 7 Control part 8a, 8b Conveyor R Rubber material P Abrasive

Claims (7)

In a rolling apparatus for rubber material having a rolling roll arranged with the circumferential surfaces facing each other with a gap, and configured to pass unvulcanized rubber material through the gap,
A silicon sensor for detecting the silicon amount of the peripheral surface of each rolling roll, a cleaning unit for cleaning the peripheral surface of each of the rolling rolls, and a control unit to which detection data from the silicon sensor is input. In addition, with respect to the rolling roll in which the silicon amount detected by the silicon sensor is equal to or greater than a preset reference value, the controller is configured to issue a command to perform cleaning by operating the cleaning unit. A rolling device for rubber material.   When a cleaning target value lower than the reference value is set in advance, and the silicon amount detected by the silicon sensor is equal to or less than the cleaning target value, a command to stop cleaning by the cleaning unit by the control unit The apparatus for rolling rubber material according to claim 1, wherein   The rubber material rolling device according to claim 1 or 2, wherein the silicon sensor is a fluorescent X-ray analyzer.   The cleaning means supplies abrasive to the peripheral surface of each rolling roll, and supplies the abrasive supplied to the peripheral surface of each rolling roll to the peripheral surface of each rolling roll. The rolling device for a rubber material according to any one of claims 1 to 3, further comprising a pressing portion for pressing.   The rubber material rolling device according to any one of claims 1 to 3, wherein the cleaning means is a rotating brush in which a large number of brush wires protrude from the shaft core portion.   It has a confirmation sensor for detecting whether or not the rubber material remains on the peripheral surface of each of the rolling rolls, and this confirmation sensor has the rubber material remaining on the peripheral surface of each of the rolling rolls. The rubber material rolling device according to any one of claims 1 to 5, wherein, when detected, the controller does not perform cleaning without operating the cleaning means.   A tire manufacturing method in which a green tire is formed using the rubber material rolled by the rubber material rolling device according to claim 1 and the green tire is vulcanized.

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