KR100805330B1 - Building drum for green tire - Google Patents

Abstract

A forming drum for a green tire is provided to extend the life time of a bladder by operating the bladder after inflating the bladder, by vertically moving up and down a shoulder support and to maintain uniformity of the tire by increasing the inflation height of the bladder formed in a bead unit. A forming drum for a green tire is composed of a center unit(3) having a center plate(2) installed about a main shaft having spindles simultaneously turned to the left or right side in an axial direction; left and right drums of the same structure symmetrically disposed about the center unit; and a bladder(6) supported to a vacuum ring installed at the left and right drums. The center plate of the center unit comes into contact with a side ring of the vacuum ring through oblique tapered surfaces(8a,8b). A shoulder support(10) interposed between the vacuum ring and a bead lock(9) is moved up and down by a driven tapered surface coming into contact with a drive tapered surface of a first cone piston(11) moving back and forth by pneumatic pressure. Cover rings(13) moving back and forth along the main shaft by pneumatic pressure to cover or open the bladder are installed at the left and right drums.

Description

Molding drum for green tires {Building drum for green tire}

1 is a cross-sectional view showing an initial state of the forming drum for a green tire according to the present invention;

FIG. 2 is an operation cross-sectional view illustrating a state in which materials are turned up in FIG. 1;

3 is a partially enlarged cross-sectional view of the center plate of the center portion of the present invention,

4 (A) is a sectional view taken along the line I-I of FIG. 1, and FIG. 4 (B) is a cross-sectional view along the line II-II of FIG. 2, showing operational state diagrams of the shoulder support.

5 (C)-(G) are operational flowcharts in accordance with the present invention,

6 (H) to (J) are cross-sectional views of the green tires and the figures showing the state of the semifinished product to be molded.

Explanation of symbols on the main parts of the drawing

1: spindle, 2: center plate,

3: center portion, 4a, 4b: drum,

5: vacuum ring, 6: bladder,

7: side ring, 8a, 8b: tapered face,

9: bead lock, 10: shoulder support,

11: first cone piston, 12a, 12b: tapered surface,

13: cover ring, 14: fixed post,

15: spring, 16: piston,

17: pneumatic passage pipe, 18: piston ring,

19: piston shaft, 20: second cone piston.

The present invention relates to a forming drum for a green tire, which winds up each member constituting the green tire, positions the beads, turns up, attaches the belt and the tread package, and manufactures the green tire.

The molding process during tire manufacturing is the operation of making cylindrical green tires by sequentially attaching all the constituent materials used for tires in the forming drum.

Here, the molding drum proposed by European Patent (EP) No. 0,468,580 among the forming drums for forming the green tire has a difference in the outer diameter of the center portion and both drums, so that the tire components are wound on the forming drum and the tip and the end are joined together. At this time, the operator has to manually attach the joint part of the pre-assembly composed of the side wall of the green tire and the inner-liner formed by the circumference. In addition, since both drum surfaces are covered with a bladder, this bladder is also made of rubber material, so that the drums on both sides are not uniform, and the elasticity of the bladder rubber itself decreases depending on the number of times of use. Brought about.

In addition, when initially attaching the pre- assembly of the green tire, part of the green tire is located at the center of the drum and the other part is located on the surface of the bladder. Although the innerliner portion of the tire is attached to the surface of the drum by a constant force or attachment device, the member located on the bladder surface has a problem that the initial attachment is not well made.

In order to solve this problem, the adhesiveness of the bladder may be improved, but in this case, the tire may not be separated from the tire material after being turned up, and after the green tire is formed, the green tire should be removed from the drum. As a result, tire materials are not adhered to and separated from the bladder.

In addition, the conventional forming drum is supported by a mechanism that tilts the inside of the bead portion when turned up, there is a problem that the rise with the bladder to cause the flow of the bead portion to cause the quality defect of the green tire.

Therefore, the present invention was invented to solve the above conventional problems, by installing the auxiliary covering drum covering the bladder on both sides of the centertec to have the same circumferential surface without the difference in the circumference of the centertek of the forming drum Therefore, when the sidewall and the inner liner are joined together, the uniformity of the overlap amount is improved, and the structure of lifting and lowering of the shoulder support can increase the expansion height of the bladder inside the bead, thereby improving the uniformity of the tire and the centertec. The purpose of the present invention is to provide a molding drum for green tires that can reduce replacement loss.

The present invention as described above is composed of a dual axis and at the same time the center portion with the center plate with respect to the main axis having a spindle that rotates in the axial direction to the left and right, and the left and right drums having the same structure while being symmetrically disposed with respect to the center portion And a molding drum for green tires, comprising a bladder held in a vacuum ring provided on the left and right drums, wherein the center plate of the center portion is in contact with each other by a side ring of the vacuum ring and an inclined tapered surface. The shoulder support disposed between the ring and the bead lock has a driven taper surface which is in contact with the driving taper surface of the first cone piston which is advanced back and forth by pneumatic operation, and moves up and down, and the main shaft is moved to cover or open the bladder. It is equipped with the cover ring which moves forward and backward by pneumatic.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view showing an initial state of the forming drum for a green tire according to the present invention, Figure 2 is a cross-sectional view showing an operating state of the state turned up materials.

In the present invention, since the left and right drums 4a and 4b have the same symmetrical structure and operate identically, only one drum is selected and described.

The present invention relates to a center portion (3) having a center plate (2) on the basis of a main shaft (1) having a spindle composed of a double axis and at the same time rotating in the axial direction to the left and right, and the center portion (3) as a reference. Molding drum for green tires comprising symmetrically arranged left and right drums 4a and 4b having the same structure and bladder 6 held in the vacuum ring 5 installed on the left and right drums 4a and 4b. In this case, the center plate 2 of the center portion 3 is in contact with each other by the side ring 7 of the vacuum ring 5 and the inclined tapered surfaces 8a and 8b, and the vacuum ring 5 and the bead The shoulder support 10 disposed between the locks 9 has a driven taper surface 12b in contact with the driving taper surface 12a of the first cone piston 11 which is advanced back and forth by pneumatic operation. The left and right drums 4a and 4b cover the cover ring 13 which is moved back and forth by pneumatic pressure along the main shaft 1 to cover or open the bladder 6. Each one is made up.

On the other hand, Figure 3 is an enlarged view showing the center plate (2) of the center portion 3, the center plate (2) which is supported by the spring 15 in the fixed post 14, the lifting operation by pneumatic pressure As the pneumatic acts in the direction of the arrow, the tapered surface 8b of the center plate 2 is the side ring 7 because the piston 16 raises the center plate 2 while compressing the spring 15. It rises along the taper surface 8a of the () and can supply the pressurized medium 201 to a material inside.

 4 (A) and (B) show a state in which the shoulder support 10 is expanded in the radial direction by the first cone piston 11.

The cover ring 13 is integrally connected with the piston shaft 19 connected to the piston ring 18 in the pneumatic passage pipe 17 so as to advance back and forth along the main shaft 1.

More detailed description of the function and configuration according to the present invention, the center portion 3 is generally different from the bead 101 distance according to the type of tire and accordingly attaches the tread 102 and the belt package 103 and In order to stitch the tread 101, both left and right drums 4a and 4b must be moved horizontally along the main axis 1.

Therefore, in the present invention, since the center plate 2 of the center portion 3 moves up and down on the fixed post 14, when the tapered surface 8a of the side ring 7 is reached, The purpan 2 is located on the upper surface of the side ring 7 as shown in FIG. 2, and the left and right drums 4a and 4b are moved to the center according to the type of tire and the tire belt package 103. At this time, the left and right distance between the beads 101 can be minimized.

In addition, the 2nd cone piston 20 is a component which raises and lowers the bead lock 9, acting by pneumatic pressure.

Next, the operation sequence of the present invention will be described with reference to FIG. 5.

In the initial state of the left and right drums 4a and 4b as shown in FIG. 1, a preassembly 106 composed of an inner liner 104 and a side wall 105 is placed thereon, and a carcass 107 is placed on the preassembly 106. After placing, the beads 101 are arranged as shown in FIG.

Subsequently, as described above, the bead lock 9 is raised by the second cone piston 20 acting on the bead 101 by pneumatic pressure, and the shoulder support 10 also uses the first cone piston 11. And the left and right drums 4a and 4b are narrowed along the direction of the arrow shown in FIG. 5 (F) about the center portion 3, and the cover ring 13 is opened in the left and right directions while being pressurized and pressurized. The medium 201 is supplied into the green tire to be molded.

Then, as shown in FIG. 5 (G), the left and right drums 4a and 4b are contracted again, and the bladder 6 wraps around the green tires 108 formed as shown in FIG. 2 while forming the green tires in the forming drums. This is done.

Molding drum for a green tire according to the present invention as described above has the following advantages.

1) Existing drums are covered with bladder with left and right drums, which is made of rubber, and the bladder and the number of times of use have circumferential deviation between the drum and both drums. At the initial attachment of the sidewalls, the tip of the material does not adhere on the bladder surface, which makes it difficult to join.

However, the present invention configures the auxiliary ring device to cover the bladder assembled on both drums so that the center portion of the drum and the circumference of both drums are eliminated and made the same so that the overlap when joining the front end and the end of the preassembly. It also improves the quality by making the amount of (Over Lap) uniform, and also enables automatic bonding.

And this cover auxiliary drum is not attached to the initial, but made of steel (solid) can be attached to the initial treatment according to the surface treatment, and can also be installed in the auxiliary ring by the vacuum pad can be installed automatically Can be achieved.

In the initial drum state, the piston assembly and the shoulder support are arranged side by side to maintain a uniform drum circumference, and by supporting the bladder, the semi-finished product is supported by the external force of the feed roll and the joining device that are pressed on the drum. Can be sufficiently compressed to eliminate air trapping between semi-finished products.

2) As the shoulder support supporting the bead is vertically raised and lowered, the bladder can be operated after inflation to extend the life of the bladder and increase the bladder expansion height inside the bead so that the tire uniformity I can keep it.

3) The vacuum rim, which assembles the piston assembly that pushes the shoulder support, helps to attach the innerliner of the initial pre-assembly, thereby auto-attaching and joining the pre-assembly.

4) The centertec assembly, which forms the center of the drum, is composed of several parts and rounded to accommodate various bead distances depending on the type of tire. In other words, when the centertek meets the taper of the side ring, the centertec and the parts rise and move over the side ring, so that the centertec can accommodate the distance between the beads varying according to the tire specification.

Claims (3)

Center part (3) with center plate (2) with respect to main axis (1) with dual axis and at the same time with spindle rotating along the axial direction to the left and right, and symmetrically arranged about this center part (3) In the forming drum for green tires, which comprises left and right drums 4a and 4b having the same structure and bladder 6 held in the vacuum ring 5 provided on the left and right drums 4a and 4b, The center plate 2 of the center portion 3 is in contact with each other by the side ring 7 of the vacuum ring 5 and the inclined tapered surfaces 8a and 8b, and the vacuum ring 5 and the bead lock 9 The shoulder support (10) disposed between the two has a driven tapered surface (12b) in contact with the driving taper surface (12a) of the first cone piston (11) to move forward and backward by the pneumatic pressure to move up and down, the bla Molding drum for green tires, characterized in that each of the left and right drums (4a, 4b) has a cover ring (13), which is moved forward and backward along the main shaft (1) to cover or open the (6). 2. The forming drum as set forth in claim 1, wherein the center plate (2) is connected to a piston (16) supported by a spring (15) in a fixed post (14). 2. The cover ring (13) according to claim 1, characterized in that the cover ring (13) is integrally connected with the piston shaft (19) connected to the piston ring (18) in the pneumatic passage pipe (17) for advancing along the main shaft (1). Molding drum for green tires.

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