JP2018012299A - Molding equipment for rubber member for tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding device for a rubber member for a tire, which can suppress the occurrence of a situation in which a rubber strip is wound around a lower conveyor and causes the molding device to stop, and suppress a decrease in production efficiency. Kind Code: A1 A molding device for a rubber member for a tire, in which a belt-shaped rubber strip is spirally wound around a molding drum to mold a rubber member for a tire, and an applicator for supplying the rubber strip to the molding drum is provided. The applicator is composed of a pair of upper and lower conveyors movably provided along the axis of the molding drum, and the lower conveyor is composed of a plurality of rollers arranged in parallel at a predetermined interval. A molding apparatus for a rubber member for a tire, which is a roller conveyor and further has a rubber adhesion preventing treatment applied to the surface of each of a plurality of rollers. [Selection diagram] Figure 1

Description

  The present invention relates to a molding apparatus for a tire rubber member used in the manufacture of a pneumatic tire.

  In recent years, in the manufacture of pneumatic tires, a so-called strip wind method is used in which a rubber member for a tire such as a tread is formed by spirally winding an extruded unvulcanized rubber band (rubber strip) around a forming drum. (For example, Patent Document 1).

  FIG. 4 is a plan view showing a part of a conventional tire rubber member molding apparatus (hereinafter also simply referred to as “molding apparatus”), and FIG. 5 is a side view. In FIG. 4, the lower conveyor 22a is also shown in order to help understanding of the conventional molding apparatus, and the upper conveyor 22b is indicated by a two-dot chain line to distinguish the upper conveyor from the lower conveyor. .

  As shown in FIGS. 4 and 5, in this molding apparatus, the applicator 22 is fed toward the molding drum 21 by the applicator 22 while the rubber strip G that has been extruded and conveyed is supplied to the shaft 21 a of the molding drum 21. The rubber strip G is spirally wound on the molding drum 21 by being moved along. The applicator 22 is composed of a pair of upper and lower conveyors 22a and 22b, and each conveyor is a belt conveyor having a belt made of resin or hand-woven cloth.

JP 2014-200959 A

  However, in the case of the above-described conventional molding apparatus, rubber scraps such as unvulcanized rubber soot adhering to the rubber strip G may adhere to the belt of the conveyor and the belt surface may have a strong adhesive force.

  In general, since the rubber strip G is narrow in width and weak in rigidity, if the adhesive force of the conveyor, particularly the lower conveyor 22a, becomes stronger, the rubber strip G will not be peeled off from the lower conveyor 22a, and the rubber strip G is caught in the lower conveyor 22a as it is. As a result, it cannot be normally supplied to the forming drum 21. In this case, it is necessary to stop the molding apparatus to correct the supply of the rubber strip G, which causes a reduction in production efficiency.

  Therefore, the present invention provides a molding apparatus for a tire rubber member that can suppress the occurrence of a situation in which a rubber strip is caught in a lower conveyor and causes the molding apparatus to stop, thereby suppressing a decrease in production efficiency. The task is to do.

The invention described in claim 1
A tire rubber member molding apparatus for molding a tire rubber member by spirally winding a belt-shaped rubber strip around a molding drum,
An applicator is provided for feeding the rubber strip to the molding drum;
The applicator is composed of a pair of upper and lower conveyors provided movably along the axis of the molding drum,
The lower conveyor is a roller conveyor composed of a plurality of rollers arranged in parallel at a predetermined interval,
Further, the rubber member forming apparatus for a tire is characterized in that the surface of each of the plurality of rollers is subjected to a rubber adhesion preventing process.

The invention described in claim 2
2. The tire rubber member molding apparatus according to claim 1, wherein an interval between the plurality of rollers is set narrower than a thickness of a rubber strip supplied by the applicator.

The invention according to claim 3
The apparatus for molding a rubber member for a tire according to claim 1 or 2, wherein a synchronization means for synchronizing the rotation of each of the plurality of rollers is provided.

The invention according to claim 4
Among the plurality of rollers, at least one roller is attached to a driving means for rotationally driving the roller,
4. The tire rubber member according to claim 3, wherein the synchronization unit is configured by bridging a belt between ends of a roller attached to the driving unit and each of the other rollers. It is a molding device.

The invention described in claim 5
5. The tire rubber member molding apparatus according to claim 1, wherein the roller is made of metal or ceramic. 6.

The invention described in claim 6
6. The tire according to claim 1, wherein at least one of a fluorine processing and a knurling processing is applied to the roller as the rubber adhesion prevention processing. It is a rubber member molding apparatus.

The invention described in claim 7
The tire rubber member molding apparatus according to any one of claims 1 to 6, further comprising temperature adjusting means for adjusting a surface temperature of the roller.

  According to the present invention, there is provided a molding apparatus for a rubber member for a tire capable of suppressing the occurrence of a situation in which a rubber strip is caught in a lower conveyor and causing the molding apparatus to stop, thereby suppressing a decrease in production efficiency. can do.

It is a side view which shows a part of shaping | molding apparatus of the rubber member for tires which concerns on one embodiment of this invention. It is a top view which shows a part of shaping | molding apparatus of the rubber member for tires which concerns on one embodiment of this invention. It is a perspective view of the roller used for the molding device of the rubber member for tires concerning one embodiment of the present invention. It is a top view which shows a part of conventional shaping | molding apparatus of the rubber member for tires. It is a side view which shows a part of conventional shaping | molding apparatus of the rubber member for tires.

  Hereinafter, a forming apparatus according to an embodiment of the present invention will be described.

  FIG. 1 is a side view showing a part of a molding apparatus for a tire rubber member according to the present embodiment, and FIG. 2 is a plan view. FIG. 3 is a perspective view of the roller 13 used in the molding apparatus according to the present embodiment. 2 also shows the lower conveyor 12a in order to help understanding of the molding apparatus of the present invention, as in FIG. 4, and the upper conveyor 12b to distinguish the upper and lower conveyors. Is represented by a two-dot chain line.

  As shown in FIGS. 1 and 2, the molding apparatus according to the present embodiment is an apparatus that forms a rubber member for a tire by spirally winding a belt-shaped rubber strip G around a molding drum 11. The applicator 12 is provided with a pair of upper and lower conveyors 12a and 12b, and each of the conveyors 12a and 12b is provided so as to be movable along the shaft 11a of the molding drum 11. It has been.

  And the molding apparatus of the rubber member for tires which concerns on this Embodiment is a roller conveyor by which the lower conveyor 12a is comprised from the some roller 13 arrange | positioned at predetermined intervals c, The surface of the roller 13 is characterized in that a rubber adhesion preventing process is performed.

  Unlike the conventional belt conveyor, the roller conveyor used in the present embodiment has gaps formed between a plurality of arranged rollers. The rubber candy can be removed by dropping from the gap between the rollers.

  In the case of a conventional belt conveyor, the rubber strip once placed on the belt keeps contacting at the same position as the belt until it is sent to the forming drum, so rubber scissors easily adhere to the belt surface. Since the roller conveyor in the form of (1) does not have such a thing, it is hard to adhere the rubber candy from this point.

  Furthermore, in this Embodiment, since the rubber | gum adhesion prevention process is performed to each surface of a roller, it is fully suppressed that a rubber soot adheres to the surface of a roller.

  Thus, according to the present invention, the rubber strip does not adhere and the adhesive force of the lower conveyor does not increase as in the conventional molding apparatus, so the rubber strip is easily peeled off from the conveyor, and the lower conveyor It is possible to suppress the occurrence of a situation in which the rubber strip is caught and the molding apparatus is stopped.

  Hereinafter, the main configuration of the molding apparatus according to the present embodiment will be described.

(1) Roller As each roller 13 which comprises a roller conveyor, a roller about 10 mm in diameter is preferable. Further, the interval c between the rollers 13 is preferably set to be smaller than the thickness t of the rubber strip G. Thereby, it can prevent reliably that the rubber strip G in conveyance falls from the clearance gap between the rollers 13. FIG. As an example, in the case of the rubber strip G having a thickness t of 0.8 to 1.3 mm, the interval c between the rollers 13 is preferably 0.5 mm or less.

  In consideration of the adhesiveness to the rubber strip G, it is preferable to use a ceramic roller such as silicon nitride or a metal roller such as carbon steel or aluminum as the roller 13. From the viewpoint of the above, it is more preferable to use a metal roller.

(2) Rubber adhesion prevention treatment As described above, the rubber adhesion prevention treatment is applied to the surface of each roller 13. Specific examples of the rubber adhesion preventing treatment include fluorine processing or knurling processing shown in FIG. 3, and these may be used in combination.

  In performing these rubber adhesion preventing treatments, it is preferable to perform the processing so that the rubber strip G has a sufficient degree of adhesiveness on the surface of the roller 13. Thereby, as shown in FIG. 2, when the applicator 12 is moved in the direction of the shaft 11a of the molding drum 11, the rubber strip G can be prevented from sliding.

  Note that the length w2 (see FIG. 3) of the region 13a to be subjected to the knurling process protrudes about 10 mm from both side edges of the rubber strip G in consideration of the width w1 (see FIG. 2) of the rubber strip G. It is preferable that it is set. Thereby, the rubber strip G can be reliably supplied to the molding drum 11. As a specific example, when the rubber strip G having a width w1 of 20 to 35 mm is conveyed, it is preferable that the length w2 of the region 13a to be subjected to the rubber adhesion preventing process is 30 to 45 mm.

(3) Synchronizing means Each of the rollers 13 constituting the roller conveyor is preferably configured to rotate in synchronization. In the present embodiment, as shown in FIG. 3, recesses 13 b are provided at both ends of each roller 13, and as shown in FIG. 2, the connecting belt 14 is bridged over the recesses at both ends. The rotation of the roller 13 can be synchronized.

  And one roller is attached to drive means (illustration omitted), such as a motor, among a plurality of rollers 13, and if one roller is rotated by a drive means, another roller will rotate in synchronization. . Thereby, since each roller can be rotated at the same speed, it can prevent that a stress is added to the rubber strip G in conveyance and a deformation | transformation and a wave are produced.

  In addition, from the viewpoint of appropriately transmitting the rotation of the roller to another roller, the roller attached to the driving means is a roller arranged on the most upstream side or the downstream side in the transport direction among the plurality of arranged rollers. It is preferable.

  In FIG. 2, the connecting belt 14 is stretched over both ends of the roller 13, but the connecting belt 14 may be stretched over only one end of the roller. Further, each roller may be synchronized using a gear or the like instead of the connecting belt.

(4) Temperature adjustment means Each roller 13 constituting the roller conveyor is preferably provided with a temperature adjustment means. By using this temperature adjusting means, the temperature of the roller 13 is adjusted according to the type of rubber strip being conveyed, so that it can be appropriately conveyed corresponding to various types of rubber strips having different viscosities.

  In general, even in the same type of rubber strip, the viscosity changes between immediately after extrusion molding and after storage for a certain period of time, so it is preferable to adjust the temperature of the roller 13 according to the elapsed time after extrusion molding.

  As temperature adjustment means, a heater or a cooler is provided below the roller to blow warm air or cold air, or a temperature control device containing liquid of a predetermined temperature such as hot water or cold water is provided below the roller. It is possible to use a means for providing the temperature adjusting device in contact with a roller.

  Moreover, it is preferable to set the conveyance speed of the rubber strip by an applicator in the range of 1200-3500 mm / sec. If the speed is less than 1200 mm / sec, the supply of the rubber strip G may be delayed and the production efficiency may be reduced. On the other hand, if the speed is higher than 3500 mm / sec, a trouble such as the rubber strip being entangled with the roller 13 may occur.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments. Various modifications can be made to the above-described embodiment within the same and equivalent scope as the present invention.

11, 21 Molding drums 11a, 21a Molding drum shafts 12, 22 Applicators 12a, 22a Lower conveyors 12b, 22b Upper conveyors 13 Rollers 13a Regions subjected to knurling processing 13b Indentations 14 Connection belt G Rubber strip c Roller Interval between t t Rubber strip thickness w1 Rubber strip width w2 Length of knurled area

Claims (7)

A tire rubber member molding apparatus for molding a tire rubber member by spirally winding a belt-shaped rubber strip around a molding drum,
An applicator is provided for feeding the rubber strip to the molding drum;
The applicator is composed of a pair of upper and lower conveyors provided movably along the axis of the molding drum,
The lower conveyor is a roller conveyor composed of a plurality of rollers arranged in parallel at a predetermined interval,
Furthermore, the rubber | gum adhesion prevention process is given to the surface of each of the said several roller, The shaping | molding apparatus of the rubber member for tires characterized by the above-mentioned.   2. The tire rubber member molding apparatus according to claim 1, wherein an interval between the plurality of rollers is set narrower than a thickness of a rubber strip supplied by the applicator.   The apparatus for molding a tire rubber member according to claim 1 or 2, further comprising a synchronization unit that synchronizes rotation of each of the plurality of rollers. Among the plurality of rollers, at least one roller is attached to a driving means for rotationally driving the roller,
4. The tire rubber member according to claim 3, wherein the synchronization unit is configured by bridging a belt between ends of a roller attached to the driving unit and each of the other rollers. Molding equipment.   The tire rubber member molding apparatus according to any one of claims 1 to 4, wherein the roller is made of metal or ceramic.   6. The tire according to claim 1, wherein at least one of a fluorine processing and a knurling processing is applied to the roller as the rubber adhesion prevention processing. Rubber member molding equipment.   The apparatus for molding a rubber member for a tire according to any one of claims 1 to 6, further comprising temperature adjusting means for adjusting a surface temperature of the roller.

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