JP2005246819A - Bladder unit apparatus for molding/vulcanizing pneumatic radial tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bladder unit apparatus for molding/vulcanizing a pneumatic radial tire which can reduce facility costs and improve the quality of the tire. <P>SOLUTION: As a concrete execution form, a lower mold clamp ring 14 is fixed, circumferentially split locking segments 24 and a lower mold ring stopper member 25 are installed in an upper mold clamp ring 13. When the upper clamp ring 13 is moved vertically by a hydraulic cylinder etc., projected fitting parts 23c set on the lower end side of the locking segments of the upper mold clamp ring are mutually engaged with projected fitting parts 23a and 23b formed on the tip peripheral surface and lower end side peripheral surface of a lower part clamp ring, or engaged through a cassette member 26. The bead intervals B<SB>1</SB>of a primary green tire Wa, a secondary green tire, and finished green tire are adjusted automatically to be able to be positioned and fixed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a bladder unit apparatus for forming and vulcanizing pneumatic radial tires. More specifically, for example, in the process of forming radial tires for construction vehicles, equipment costs can be reduced and quality can be improved. The present invention relates to a bladder unit device for forming and vulcanizing a pneumatic radial tire.

  In recent years, large tires for construction vehicles, called OR tires (Off the Road Tire), have been increasing in production of radial tires due to the increase in size and speed of vehicles.

  In such a radial tire manufacturing method, a primary green tire (unvulcanized tire) forming a tire skeleton such as a carcass ply or a bead core is first molded by a first stage molding machine, and then the primary green tire is second stage. Inflate until the specified outer diameter is achieved by the bladder mechanism of the molding machine, form a belt and tread rubber around the outer periphery and form a finished green tire, and then inflate the finished green tire with a vulcanizing bladder. Then, it is molded so as to be vulcanized with a vulcanizer.

  Conventionally, as an improvement of a method for manufacturing a pneumatic radial tire, a technical idea has been proposed in which an inflation bladder for a second-stage molding machine and an inflation bladder for a vulcanizer are combined (for example, patents). Reference 1).

  However, in the production of radial tires, the first-stage molding machine and the second-stage molding machine, which are the most expensive in terms of equipment, are still the tire molding bladder, or an alternative primary green tire inflating device, and the vulcanization bladder. Therefore, there is a problem that not only the cost of these apparatuses but also a large space is required for installation of the apparatuses, thus increasing the equipment cost.

  Further, as a conventional POT type vulcanization bladder unit for a large bias tire, for example, as shown in FIG. 7, the bead interval Bx of the green tire Wx and the bead of the completed green tire Wx at the time of vulcanization molding shown in FIG. It had only a two-stage operation function with the interval By.

  That is, the vulcanization bladder unit 4 including the cylindrical bladder 3 clamped by the upper mold clamp ring 1 and the lower mold clamp ring 2 moves the upper mold clamp ring 2 up and down while the lower mold clamp ring 2 is fixed. The upper clamp ring 1 and the lower clamp ring 2 are configured to be movable, and hook-shaped locking portions 5a and 5b that can be engaged and disengaged with each other are provided at the tips of the upper mold ring 1 and the lower mold ring 2.

However, such a vulcanized bladder unit for a bias tire can be adjusted as a vulcanized bladder unit that requires at least three stages of adjustment functions for forming a radial tire because the bead interval can be adjusted in only two stages. There was a problem that I could not do it.
Japanese Patent Laid-Open No. 49-15776

  This invention pays attention to such a conventional problem, and provides a bladder unit device for forming and vulcanizing a pneumatic radial tire that can reduce the equipment cost and improve the quality of the tire. It is the purpose.

  In order to achieve the above-mentioned object, the present invention provides an additional process comprising a cylindrical bladder clamped by an upper mold clamp ring and a lower mold clamp ring at the inner diameter of a primary green tire molded by a first stage molding machine. A pneumatic radial tire is molded and vulcanized with a vulcanization bladder unit and a bead interval adjustment mechanism that changes the bead interval during tire molding and the bead interval during tire vulcanization in multiple stages. In the dual bladder unit apparatus, the bead interval adjusting mechanism moves the at least one of the upper die clamp ring and the lower die clamp ring in the approaching direction and adjusts the bead interval. The lower clamp ring and the fitting surface are provided with engaging portions that can be engaged and disengaged in multiple stages, and the bead interval is adjusted between the engaging portions. It is an gist in that a plurality of types of cassettes member detachably for.

  Here, when the upper mold clamp ring and the lower mold clamp ring are provided with a seal member on the fitting surface, and the lower mold clamp ring is fixed and the upper mold clamp ring is configured to be movable, the upper mold clamp ring A locking segment and a lower mold ring stopper are provided. Further, the engaging portions that are engaged in multiple stages include the bead interval of the first-stage green tire molded by the first-stage molding machine and the bead interval of the second-stage green tire molded by the second-stage molding machine. And a bead interval at the time of tire vulcanization.

  Thus, by comprising, an installation cost can be reduced and the quality of a tire can be improved.

The present invention provides a vulcanized bladder having a cylindrical bladder clamped to an upper mold clamp ring and a lower mold clamp ring on an inner diameter portion of a primary green tire molded by a first stage molding machine as described above. This unit is equipped with a bead interval adjustment mechanism that changes the bead interval during tire molding and the bead interval during tire vulcanization in multiple stages. In the bladder unit device, the bead interval adjusting mechanism moves the at least one of the upper die clamp ring and the lower die clamp ring in the approaching direction to adjust the bead interval, and The mold clamp ring and the fitting surface are provided with engaging portions that can be engaged with and disengaged from each other in a multi-stage manner. Since the type of cassette member provided detachably, in which excellent effects as follows.
(a). By replacing the shaping function (function to inflate the secondary green tire) in the second stage molding machine with the shaping device (vulcanization bladder apparatus) for the vulcanization process, the existing first stage molding machine Radial tires can be produced only with this, so the equipment cost can be reduced.
(b) The vulcanization bladder unit with the belt and tread attached to the green tire can be used as it is until the vulcanization process, which is extremely advantageous for productivity and has a bead interval adjustment mechanism that changes the bead interval. Therefore, proper processing can be performed, and the tire quality is also stabilized because the green tire is not transferred to the vulcanization bladder unit.
(c) Since the cylindrical first-stage green tire is inflated to a shape that can be substantially vulcanized by the vulcanization bladder, vulcanization is performed in the second-stage green tire formed into a drum shape. This is advantageous for quality problems such as air remaining between the bladder and the green tire as compared with the case of inflating the bladder.
(d) Since the shape of the vulcanization bladder can be the same as that of the first stage green tire, the conventional vulcanization bladder for bias can be used, and the mold for the vulcanization bladder for radial tires can be manufactured. Cost is not required. That is, in the conventional method, when a vulcanization bladder is used from the second stage green tire, an empty bean-type dedicated vulcanization bladder that matches the inner shape of the green tire is required.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
1 (a) to 1 (l) show schematic configuration diagrams of, for example, a manufacturing process of a pneumatic radial tire for a construction vehicle in which the present invention is implemented. In this manufacturing process, FIG. The process of manufacturing the primary green tire Wa in the molding drum 12 of the molding machine 11, FIG. 1 (b) does not attach a belt tread or the like to the primary green tire Wa removed from the molding drum 12 of the first stage molding machine 11. FIG. 1 (c) shows a cylindrical bladder 15 clamped by an upper mold clamp ring 13 and a lower mold clamp ring 14 at the inner diameter of the primary green tire Wa. wearing the vulcanized bladder unit 16 having, by vulcanization bladder unit 16 to the bead spacing of the primary green tire Wa to B _1, introducing a pressurized fluid such as compressed air to the bladders 15 A primary green tire Wa inflate Te, to the outer diameter of the primary green tire Wa to D.

FIG. 1D shows that the primary green tire Wa is made to have a bead interval B ₂ by the vulcanization bladder unit 16 and a pressurized fluid such as compressed air is introduced into the bladder 15 to inflate the primary green tire Wa. At this time, the primary green tire Wa held at a predetermined bead interval B ₂ is held by the outer diameter D ₂ necessary for attaching the belt tread or the like in the second stage molding machine 17 by a conveying device 18 such as a carriage. This is a step of conveying the primary green tire Wa to the position of the reversing device 19.

  FIG. 1 (e) shows a process of horizontally transferring the primary green tire Wa to the reversing device 19, and FIG. 1 (f) shows the turning operation of the primary green tire Wa in the horizontal state by 90 ° in the vertical state. In the process, FIG. 1 (g), the primary green tire Wa in a vertical state is attached to the main shaft 17 a of the second stage molding machine 17 together with the vulcanization bladder unit 16, and a belt tread T is wound around the primary green tire Wa. The step of forming the secondary green tire Wb, FIG. 1 (h) is the step of attaching the formed secondary green tire Wb to the reversing device 19 again in the vertical direction, and FIG. 1 (i) is the step of reversing the secondary green tire Wb. FIG. 1 (j) is a step of transferring the secondary green tire Wb from the reversing device 19 to a transport device 20 such as a carriage.

Figure 1 (k) is a secondary green tire Wb and the bead spacing B ₃ by vulcanization bladder unit 16, pressure such as compressed secondary green tire Wb so that the outer diameter D ₂ of the vulcanization air the step of inflating by introducing a fluid, FIG. 1 (l) of the vulcanization mold vulcanizer while wearing the vulcanized bladder unit 16 a secondary green tire Wb molded to the outer diameter D ₂ of the vulcanization No. 21, and the secondary green tire Wb is heated and pressurized in the vulcanization mold 21 while maintaining the inflated state, and is cured to complete a pneumatic radial tire.

  In the manufacturing process of a pneumatic radial tire as described above, the bladder unit device 16 for both molding and vulcanization according to the present invention vulcanizes the primary green tire Wa molded by the first stage molding machine 11 with a vulcanizer. It is used until it is put into the mold 21, and has a structure as shown in FIGS. 2 to 6, 30a and 30b are upper and lower bead rings, 31 is an upper mold ring, and 32 is a lower lock ring.

The bladder unit device 16 has a cylindrical shape clamped by an upper mold ring 13 and a lower clamp ring 14 formed in a cylindrical shape on the inner diameter portion of the primary green tire Wa formed by the first stage molding machine 11. The vulcanization bladder unit 16 having the above-described bladder 15 is mounted, and the primary green tire Wa, the secondary green tire Wb, and the completed green tire are connected to the bead intervals B ₁ and B ₂ during tire molding and the tire vulcanization time. A bead interval adjusting mechanism 22 for changing the bead interval B ₃ in multiple stages is provided.

The bead interval adjusting mechanism 22 moves the at least one of the upper die clamp ring 13 and the lower die clamp ring 14 in the approaching direction to adjust the bead intervals B ₁ , B ₂ , B _3. The clamp ring 13 and the lower clamp ring 14 are formed in a cylindrical shape so as to be fitted, and the cylindrical slidable fitting surfaces of the upper mold clamp ring 13 and the lower clamp ring 14 are multistage. Protruding locking portions 23a, 23b, and 23c that engage with the cassette member 26 are provided.

As a specific embodiment of the present invention, the lower clamp ring 14 is fixed, and the upper clamp ring 13 is divided into a plurality of pieces in the circumferential direction as shown in FIGS. Are provided on the lower end side of the locking segment 24 of the upper clamping ring 13 when the upper clamping ring 13 is moved up and down by a hydraulic cylinder or the like. The protrusion-shaped locking portion 23c engages with the protrusion-shaped locking portions 23a, 23b formed on the outer peripheral surface at the front end and the outer peripheral surface on the lower end side of the lower clamp ring 14, or is engaged through the cassette member 26. combined, automatically adjusts positioning the primary green tire Wa, 2 primary green tire Wb and the bead spacing of the finished green tire B _1, B _2, B ₃ It is configured as constant as possible.

In other words, in order to be able to adjust the bead intervals B ₁ and B ₂ between the primary green tire Wa and the secondary green tire Wb in a multi-stage manner, a protruding locking portion 23c provided on the lower end side of the locking segment 24; A plurality of types of cassette members 26 having different lengths are detachably provided between the protrusion-shaped engaging portions 23a formed on the outer peripheral surface of the tip of the lower clamp ring 14.

  Further, a seal member 27 is provided on the sliding surface between the upper mold ring 13 and the lower mold ring 14 in order to prevent air leakage when the primary green tire Wa and the secondary green tire Wb are inflated.

In the embodiment of the present invention, the engaging portions 23 a, 23 b, 23 c that are engaged in multiple stages and the plurality of types of cassette members 26 having different lengths are formed by the first stage green tire formed by the first stage molding machine 11. the bead spacing B ₁ of Wa, and the bead spacing B ₂ of the second-stage green tire Wb molded by the second-stage forming machine 17, as can be adjusted in at least three stages of the bead spacing B ₃ of tire vulcanization configuration Thus, a pneumatic radial tire can be easily manufactured.

That is, in the half sectional view of FIG. 2, the vulcanized bladder unit 16 is mounted on the inner diameter portion of the primary green tire Wa in the step of FIG. 1 (c), and the bead of the primary green tire Wa at this time is shown. The interval is B ₁ , and the protruding locking portion 23 c provided on the lower end side of the locking segment 24 and the protruding locking portion 23 a formed on the outer peripheral surface of the lower end of the lower clamp ring 14 are not engaged. It has become.

Then, as shown in the half sectional view of FIG. 3, in order to make the primary green tire Wa have an outer diameter D ₁ necessary for attaching the belt tread and the like in the second stage molding machine 17, the upper clamp ring 13 The locking segment 24 is lowered to a predetermined gap between the protruding locking portion 23c provided on the lower end side of the locking segment 24 and the protruding locking portion 23a formed on the outer peripheral surface of the tip of the lower clamp ring 14. is interposed cassette member 26 of the length engaged by the bead interval is B _2.

In this state, when a pressurized fluid such as compressed air is introduced into the bladder 15 of the vulcanizing bladder unit 16 to inflate the primary green tire Wa, the primary green tire Wa is converted into a belt tread in the second stage molding machine 17. It becomes the outer diameter D ₁ required for pasting etc.

  Then, as shown in the half sectional view of FIG. 4, a second green molding machine 17 forms a finished green tire Wb (secondary green tire Wb) by pasting a belt tread T on the outer peripheral surface of the primary green tire Wa. It is.

In the vulcanization process, as shown in the half sectional view of FIG. 5, in order to set the bead interval required for the outer diameter at the time of vulcanization to B ₃ , the locking segment 24 of the upper clamp ring 13 is lowered, a projecting engaging portion 23c provided at the lower side of the locking segment 24, and a locking portion 23b protruding formed on the lower end side outer peripheral surface of the lower clamp ring 14 engage one another, the bead spacing B ₃ After adjusting and charging the vulcanizing mold 21 of the vulcanizer with the shape and the bead interval B ₃ maintained, the secondary green tire Wb is heated in the vulcanizing mold 21 while maintaining the inflated state. -Pressurized and cured to complete a pneumatic radial tire.

  As described above, by replacing the shaping function (function of inflating the secondary green tire) in the second stage molding machine 17 with the shaping apparatus (vulcanization bladder apparatus) for the vulcanization process, the existing first stage As a result of producing radial tires only with the molding machine 11, equipment costs can be reduced, and the vulcanization bladder unit 16 in which a belt tread is attached to a green tire can be used as it is until the vulcanization process. It is extremely advantageous for productivity and has a bead interval adjusting mechanism 22 for changing the bead interval, so that appropriate processing can be performed and the green tire is not transferred to the vulcanization bladder unit, so that the tire quality is also stable. is there.

1 (a) to 1 (l) are schematic configuration diagrams of a manufacturing process of a pneumatic radial tire embodying the present invention. It is a partial half sectional view of a state where a primary green tire is removed from the first stage molding machine and a vulcanization bladder unit is mounted on the primary green tire. FIG. 3 is a partial half sectional view of a primary green tire formed by inflating a primary green tire to have a bead interval and an outer diameter in a second stage molding machine. FIG. 5 is a partial half sectional view of a completed green tire (secondary green tire) in a state where a belt tread is attached to an outer peripheral surface of a primary green tire in a second stage molding machine. FIG. 3 is a partial half sectional view of a completed green tire (secondary green tire) when a vulcanization mold is put in a state where bead intervals necessary for an outer diameter at the time of vulcanization are set. It is an AA arrow top view of FIG. FIG. 6 is a partial cross-sectional view of a completed green tire using a conventional vulcanization bladder unit for a bias tire. It is a partial sectional view of a completed green tire at the time of vulcanization using a vulcanization bladder unit for a conventional bias tire.

Explanation of symbols

Wx Complete green tire Bx, By Bead spacing 1 Upper clamp ring 2 Lower clamp ring 3 Bladder 4 Vulcanized bladder unit 5a, 5b Locking part 11 First stage molding machine 12 Molding drum 13 Upper clamp ring 14 Lower clamp Ring 15 Bladder 16 Vulcanizing bladder unit 17 Second stage molding machine 18 Conveying device 19 Reversing device 20 Conveying device 21 Vulcanizing mold 22 Bead interval adjusting mechanism 23a, 23b, 23c Locking portion 24 Locking segment 25 Lower mold ring stopper member 26 Cassette member 27 Seal member 30a, 30b Upper and lower bead rings 31 Upper mold ring 32 Lower lock ring
Wa Primary green tire Wb Secondary green tire B ₁ , B ₂ , B ₃ Bead spacing D, D _1, D ₂ Outer diameter

Claims (4)

A vulcanization bladder unit having a cylindrical bladder clamped by an upper mold clamp ring and a lower mold clamp ring is mounted on the inner diameter portion of a primary green tire molded by a first stage molding machine, and the vulcanization is performed. A bladder unit device for forming and vulcanizing a pneumatic radial tire provided with a bead interval adjusting mechanism for changing the bead interval at the time of tire molding and the bead interval at the time of tire vulcanization in a multi-stage in the bladder unit.
When adjusting the bead interval by moving at least one of the upper mold clamp ring and the lower mold clamp ring in the approaching direction, the bead interval adjusting mechanism is configured to engage the upper mold ring, the lower mold clamp ring, and the fitting surface. The pneumatic radial tire is provided with a plurality of engaging portions that can be engaged with and disengaged from each other, and a plurality of types of cassette members for adjusting the bead interval are detachably provided between the engaging portions. Molding and vulcanizing bladder unit equipment. The bladder unit device for forming and vulcanizing a pneumatic radial tire according to claim 1, wherein a sealing member is provided on a fitting surface between the upper clamp ring and the lower clamp ring. The pneumatic radial tire according to claim 1 or 2, wherein when the lower mold clamp ring is fixed and the upper mold clamp ring is configured to be movable, a locking segment and a lower mold ring stopper are provided on the upper mold ring. Molding and vulcanizing bladder unit equipment. The multi-stage engaging portion includes a bead interval of a first-stage green tire formed by a first-stage molding machine, and a bead interval of a second-stage green tire formed by a second-stage molding machine, The bladder unit device for forming and vulcanizing a pneumatic radial tire according to claim 1, 2 or 3, wherein the bladder unit device is configured in at least three stages with a bead interval during tire vulcanization.

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