JP2014069561A - Rubber strip adhesion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent breaking of a rubber strip due to stopping and improve the production efficiency of a rubber member for tires.SOLUTION: A rubber strip adhesion device comprises rubber strip supply means of supplying a rubber strip intermittently while carrying out extrusion molding and an applicator delivering the rubber strip, receiving from the rubber strip supply means, from a delivery roller at the tip end to a molding former. The rubber strip supply means has a gear pump extruder provided with an extrusion head having a gear pump and a preliminary molding port at the front end of the body of a screw type rubber extruder and calender roll means. The applicator has recovering means of causing a rubber strip delivered from the delivery roller to fall for automatic recovery when a rubber strip is not adhered to the molding former.

Description

  The present invention relates to a tire rubber member manufacturing apparatus that forms a tire rubber member by a wound body of a rubber strip.

  As shown in FIG. 4, there has been proposed an apparatus b for winding a rubber strip g around a molding former a while extruding it, thereby forming a tire rubber member such as a tread rubber or a side wall rubber (for example, a patent). Reference 1).

  The apparatus b includes a rubber strip supply means c for supplying the rubber strip g while extruding, and an applicator d for receiving the rubber strip g from the rubber strip supply means c and sending it from the feed roller d1 to the molding former a. Have.

  In the apparatus b, the rubber strip g is temporarily supplied until the formed tire rubber member is removed from the molding former a and the next formation is started, or when changing the tire size. It needs to be stopped. Therefore, in the rubber strip supply means c, a gear pump extruder c1 that intermittently extrudes the pre-formed rubber g1, and a calender roll means c2 that rolls the extruded rubber g1 into a rubber strip g having a final thickness. The rubber strip g is intermittently formed according to the formation cycle of the tire rubber member. The gear pump extruder c1 includes an extrusion head f having a gear pump f1 and a pre-forming port f2 at the front end portion of the screw type rubber extruder main body c1a. The gear pump extruder c1 is preformed by turning the gear pump f1 on and off. The rubber g1 is pushed out intermittently. The calendar roll means c2 is turned on and off in synchronization with the gear pump f1.

  However, the rubber strip supply means c has a problem that when the supply of the rubber strip g is stopped for a long time (for example, about 10 minutes) such as when changing the setting, the rubber strip g is easily broken at the time of restart. . This is because the rubber strip g is in contact with the calendar roll c2a while the gear pump f1 is stopped. Therefore, at the contact portion of the rubber strip g, the temperature is locally increased and softened by the heat of the calendar roll c2a. For this reason, the strength at the contact portion is reduced, and the portion is broken at the time of restart. The breakage significantly reduces the production efficiency of the tire rubber member.

JP 2011-183698 A

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a rubber strip attaching device that can prevent the rubber strip from being broken by stopping and improve the production efficiency of a rubber member for a tire.

In order to solve the above-mentioned problems, the invention of claim 1 of the present application forms a rubber member for a tire comprising a wound body of the rubber strip by winding a long rubber strip on a molding former and pasting it. An apparatus for manufacturing a tire rubber member,
Rubber strip supply means for intermittently supplying the rubber strip while extrusion molding;
A conveying belt guided by a guide roller including a feeding roller on the front end side in the conveying direction so as to be able to circulate; on the conveying belt, a rubber strip from the rubber strip supply means is received and transferred from the feeding roller side to the molding former; An applicator including a conveyor for delivering,
The rubber strip supply means has a gear pump and a pre-forming port at the front end portion of the screw type rubber extruder body, and the rubber strip supply means applies the pre-formed rubber from the pre-forming port according to turning on and off of the rotation of the gear pump. A gear pump extruder provided with an extrusion head that extrudes intermittently;
A calender roll means arranged at the front part of the preforming port and rolling and molding the rubber from the preforming port into a rubber strip having a final thickness;
The applicator is
When the rubber strip is not attached to the molding former, the rubber strip sent from the feed roller is dropped and automatically collected to provide a collection means,
And the recovery means supports a recovery box that receives the falling rubber strip, and supports the recovery box so as to be movable back and forth between a recovery position below the feed roller and a standby position on the rear side of the recovery position. It is characterized by having ingredients.

  According to a second aspect of the present invention, the tire rubber member manufacturing apparatus further includes a control unit, and the control unit operates the recovery unit and waits for the recovery box when the gear pump stops at a reference time t1 or more. A payout operation is performed in which the gear pump and the applicator are driven at a predetermined time t2 while being moved from the position to the collection position, and the rubber strip resulting from the payout operation is dropped from the feed roller and accommodated in the collection box. It is said.

  According to a third aspect of the present invention, the speed of the rubber strip in the payout operation is lower than the speed of the rubber strip when the tire rubber member is formed.

  In the present invention, as described above, the applicator is provided with a collecting means for collecting the rubber strip fed from the feeding roller when the rubber strip is not attached to the molding former.

  For example, when the formation line of the tire rubber member is stopped for a long time, such as when changing the setting, the rubber strip supply means and the applicator are driven before the strength of the rubber strip is lowered at the contact portion with the calendar roll. It is desirable to perform a payout operation. When this payout operation is performed, the contact portion with the calendar roll moves and the strength reduction of the rubber strip is suppressed, so that the rubber strip can be prevented from being broken at the time of restart.

  However, in this case, an extra rubber strip is generated by the payout operation. However, the manufacturing apparatus of the present invention includes the collecting means. Therefore, the excess rubber strip generated by the payout operation can be dropped from the feed roller and automatically collected in the collection box.

It is a side view which shows one Example of the manufacturing apparatus of the rubber member for tires of this invention. It is an enlarged side view which expands and shows an applicator. It is the flowchart of the manufacturing apparatus controlled by a control means. It is a side view which shows the conventional manufacturing apparatus.

Hereinafter, embodiments of the present invention will be described in detail.
As shown in FIG. 1, the tire rubber member manufacturing apparatus 1 (hereinafter referred to as “manufacturing apparatus 1”) of the present embodiment supplies rubber strips intermittently while extruding a long rubber strip G. Means 2 and an applicator 3 that receives the rubber strip G from the rubber strip supply means 2 and delivers it to the molding former F. The fed rubber strip G is wound and pasted on a molding former F, thereby forming a tire rubber member formed of a wound body of the rubber strip.

  The rubber strip supply means 2 includes a gear pump extruder 4 and a calender roll means 5 and operates intermittently according to the formation cycle of the tire rubber member, and forms the rubber strip G only when necessary. The gear pump extruder 4 includes a screw type rubber extruder main body 6 and an extrusion head 7 provided at the front end portion thereof.

  The screw type rubber extruder main body 6 has a known structure in which a screw shaft 6b is housed in a cylinder 6a provided with a rubber insertion port 6c. Then, the screw shaft 6b is driven to rotate by an electric motor (not shown), and the charged rubber material is supplied to the extrusion head 7 at the front end of the cylinder 6a while being kneaded.

  The extrusion head 7 has a casing 8 supported on the front end portion of the screw type rubber extruder body 6, a gear pump 9 attached to the casing 8, and a pre-forming port 10. Then, the pre-formed rubber is intermittently pushed out from the pre-forming port 10 according to whether the rotation of the gear pump 9 is on or off.

  The calendar roll means 5 includes a casing 11 disposed at the front portion of the preforming port 10 and upper and lower calendar rolls 5 a attached to the casing 11. Then, the rubber from the preforming port 10 is rolled and formed between the upper and lower calendar rolls 5a and 5a and sent out as a rubber strip G having a final thickness. The calendar roll means 5 is operated on and off in synchronization with the gear pump 9.

  Next, the applicator 3 receives the rubber strip G from the rubber strip supply means 2 and feeds it to the molding former F from the feeding roller 12a on the front end side, and does not attach the rubber strip G to the molding former F. And a collecting means 14 for dropping and automatically collecting the rubber strip G fed from the feeding roller 12a.

  Specifically, as shown in FIG. 2, the applicator 3 of the present example includes a frame 21 extending forward and backward toward the forming former F at the upper end of the support 20, and the conveyor 13 Is attached.

  In this example, the support body 20 is a Y-axis moving table 22 that can move in the Y-axis direction perpendicular to the axial direction of the forming former F, and an elevating / lowering supported by the Y-axis moving table 22 so as to be raised and lowered. A base 23, an X-axis moving base 24 supported by the lifting base 23 so as to be movable in the X-axis direction which is the axial direction, and a Y supported by the X-axis moving base 24 so as to be movable in the Y-axis direction A shaft moving table 25 is provided. The movement of the elevating table 23, the X-axis moving table 24, and the Y-axis moving table 25 is performed in order to obtain a rubber member for a tire having a predetermined cross-sectional shape by changing the attaching position and angle of the rubber strip G to the molding former F. To be done. Therefore, high precision is required for this movement. Therefore, in this example, the movement is controlled by moving means using a ball screw mechanism. On the other hand, the movement of the Y-axis moving table 22 causes the applicator 3 to move from the molding former F when removing the previously formed tire rubber member from the molding former F and when changing the size. Done to release.

  The conveyor 13 includes a guide roller 12 including the delivery roller 12a and a conveyance belt 15 guided by the guide roller 12 so as to be able to go around. Then, on the conveyor belt 15, the rubber strip G from the rubber strip supply means 2 is received and conveyed to the delivery roller 12a.

  Specifically, the conveyor 13 is guided so as to be able to go around by a lower conveyor part 13L having a lower conveying belt 15L guided by a plurality of lower guide rollers 12L and a plurality of upper guide rollers 12U. And an upper conveyor portion 13U having an upper conveyor belt 15U. A rubber strip G is sandwiched between the upper and lower conveyor belts 15U and 15L and conveyed.

  The upper conveyor portion 13U is divided into front and rear conveyor portions 13Uf and 13Ur. The front and rear conveyor portions 13Uf and 13Ur are provided with pressing rollers 12b for pressing the upper conveyor belt 15U against the lower conveyor belt 15L. Each is arranged. A cutting means 16 having a known structure for cutting the rubber strip G is disposed between the front and rear conveyor portions 13Uf and 13Ur.

  Next, the recovery means 14 is attached to the lifting platform 23 in this example. The collection means 14 supports the collection box 26 and the collection box 26 so as to be movable back and forth between a collection position P1 below the delivery roller 12a and a standby position P2 on the rear side of the collection position P1. Ingredient 27 is provided.

  As the support 27, a cylinder 27A with a built-in guide shaft 27Aa is used in this example. The collection box 26 is attached to the tip of the rod 27Ab of the cylinder 27A. The collection box 26 is opened upward to collect the rubber strip G falling from the feed roller 12a.

  The manufacturing apparatus 1 of this example further includes a control means 30. When the gear pump 9 stops for a reference time t1 or longer, the control means 30 operates the collection means 14 and moves the collection box 26 from the standby position P2 to the collection position P1.

  Further, as shown in FIG. 1, the control means 30 performs a payout operation for driving the gear pump 9 and the applicator 3 for a predetermined time t2. Then, the rubber strip G generated by the payout operation is dropped from the feed roller 12a to be accommodated in the collection box 26 located below. At the end of the payout operation, the cutting means 16 operates, whereby only the rubber strip G generated by the payout operation can be cut and collected. The operation of the cutting means 16 is included in the payout operation.

  Here, the reference time t1 is a stop time during which the rubber strip G does not break, and an optimal value is set according to the rubber composition of the rubber strip G, the thickness, the temperature of the calendar roll 5a, and the like. In this example, 10 minutes is set as the reference time t1.

  Further, the time t2 of the payout operation is not particularly limited, but the portion (sometimes referred to as a contact portion) where the rubber strip G and the calender roll 5a are in contact during the stop passes through the cutting means 16. Time is preferred. Thereby, the contact portion can be collected. In this example, 1 minute is set as the time t2. Further, the speed V1 of the rubber strip G in the payout operation is preferably lower than the speed V2 of the rubber strip G when forming the tire rubber member. Thus, the tension can be kept low, and the rubber strip G can be prevented from breaking at the contact portion during the dispensing operation.

  FIG. 3 is a flowchart of the manufacturing apparatus 1 controlled by the control means 30.

  As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.

DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus 2 Rubber strip supply means 3 Applicator 4 Gear pump extruder 5 Calendar roll means 6 Screw type rubber extruder main body 7 Extrusion head 9 Gear pump 10 Pre-forming port 12 Guide roller 12a Delivery roller 13 Conveyor 14 Collection means 15 Conveying belt 26 Collection box 27 Support means 30 Control means F Molding former G Rubber strip P1 Collection position P2 Standby position

Claims (3)

A tire rubber member manufacturing apparatus for forming a rubber member for a tire comprising a wound body of the rubber strip by winding a long rubber strip on a molding former and attaching the rubber strip,
Rubber strip supply means for intermittently supplying the rubber strip while extrusion molding;
A conveying belt guided by a guide roller including a feeding roller on the front end side in the conveying direction so as to be able to circulate; on the conveying belt, a rubber strip from the rubber strip supply means is received and transferred from the feeding roller side to the molding former; An applicator including a conveyor for delivering,
The rubber strip supply means has a gear pump and a pre-forming port at the front end portion of the screw type rubber extruder body, and the rubber strip supply means applies the pre-formed rubber from the pre-forming port according to turning on and off of the rotation of the gear pump A gear pump extruder provided with an extrusion head that extrudes intermittently;
A calender roll means arranged at the front part of the preforming port and rolling and molding the rubber from the preforming port into a rubber strip having a final thickness;
The applicator is
When the rubber strip is not attached to the molding former, the rubber strip sent from the feed roller is dropped and automatically collected to provide a collection means,
And the recovery means supports a recovery box that receives the falling rubber strip, and supports the recovery box so as to be movable back and forth between a recovery position below the feed roller and a standby position on the rear side of the recovery position. An apparatus for manufacturing a tire rubber member, comprising: a tool.   The tire rubber member manufacturing apparatus further includes control means, and when the gear pump stops at a reference time t1 or more, the control means operates the recovery means to move the recovery box from the standby position to the recovery position. 2. A payout operation in which the gear pump and the applicator are driven at a predetermined time t2, and a rubber strip by the payout operation is dropped from a feed roller and accommodated in the collection box. Manufacturing apparatus for rubber members for tires.   The tire rubber member manufacturing apparatus according to claim 1 or 2, wherein a speed of the rubber strip in the payout operation is lower than a speed of the rubber strip when the tire rubber member is formed.

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