KR100329702B1 - The single stage drum device and method for building tire - Google Patents

Abstract

The present invention relates to a single-stage forming drum device and a molding method of a tire, wherein a ball screw (1) is provided at the center and is fitted around a drum shaft (10) having various air holes (2) formed therein, and a center segment ( 5) The semi-finished product is installed around the drum 12 which is divided from side to side, starting from 5), and the bead holder push block 11 is advanced by the air supplied through the air hole 2, and the bead holder 3 Air is supplied to the turn-up bladder support space 6 after the ball screw block 4 is moved by the ball screw 1 to the longitudinal center of the drum 12. The turn-up bladder support 7 is rotated by the air, and the turn-up bladder 8 is inflated by the air supplied to the inside of the center segment 5 and the turn-up bladder 8 so that the semi-finished product is turned up and the push bladder (9) is inflated to support the turn-up bladder (8) from the side and bottom It is possible to use only the mechanical structure without using the shoulder bladder, which can improve the quality of the final product, reduce the defective rate, reduce the cost and improve the workability. A molding drum device and a molding method of a tire are provided.

Description

Single stage drum device and method for building tire

The present invention relates to a single-stage forming drum device and a molding method of a tire, and in particular, to improve the quality of finished products by improving the left and right uniformity of a single stage radial molding machine for making a green tire. It relates to a molding drum device and a molding method of the.

In the manufacturing apparatus of pneumatic tires, a process of conveying processed semi-finished products through extrusion, cutting, beading, pocketing, and rolling processes to make green tires is called building.

Extrusion is a process in which rubber for tread or sidewall containing necessary chemicals such as carbon and sulfur is mixed with natural rubber and synthetic rubber through a mold conforming to the standard, and rolling over to the molding process. It refers to the topping work of thinly coating rubber film on both sides of cord paper made of steel, nylon and fiber. In addition, the cutting is the work to take over the pocket process by cutting the coded paper topped in the rolling process at an angle and width that meets the specifications. The handed over code goes through two or more layers of pockets that are made of semi-cylindrical semi-finished products. The carcass ply is formed as a semifinished product from the pocketing process. And the bead process is a process of forming the bead which supports a tire circumferential load by applying rubber | gum to a steel wire.

Thus, the configuration of a conventional single-stage forming drum device in which the processed semi-finished product is transported through extrusion, cutting, beads, pockets, and rolling processes to manufacture green tires is illustrated in FIG. 2.

Such a drum device includes a center segment (5), shoulder bladder (14), shoulder bladder support (15), turn-up bladder (8), turn-up bladder support (7). , A push bladder 9, a push bladder support 15, a bead holder 3, and a sliding part 16.

Referring to the operation of the conventional molding drum device having such a configuration, after attaching the inner liner (17), carcass ply (18), etc., a semi-finished tire on the surface of the forming drum 12, the horizontal direction In the circumferential direction by using a stitching roll (not shown) installed in the circumferential direction, the inner liner (17) by an air injector (not shown) while the bead (19) is fixed at the position of the bead holder (3). ) Air is injected into the inside and the shoulder bladder 14.

In this way, the shoulder bladder 14 is expanded and at the same time the shoulder bladder support 15 which is fastened to the sliding part 16 moves toward the center segment 5 side (toward the center of the drum) to form a drum. Tire semi-finished products (inner liner, carcass ply, etc.) attached to the foam are expanded to form the interior of the green tire. Subsequently, after the tire semi-finished product is turned up by the turn-up bladder 8 and the push bladder 9, a belt and a tread are attached to the green tire, which is close to the finished product.

However, in the conventional green tire forming drum device, the left and right shoulder bladder 14 is not uniformly expanded or the left and right bladder gauges (not shown) are not uniform, so the left and right balance of the final green tire product is not balanced. Instead, the defective rate increases, and there is a problem that the required cost increases due to the mounting of the shoulder bladder.

The present invention has been made to solve the above problems, and an object of the present invention is to structurally complement the left and right uniformity in the drum to improve the uniformity and dynamic balance in the finished tire to improve the defect rate It is to provide a single-stage forming drum device for reducing and a green tire forming method by the device.

1 is a side cross-sectional view showing a tire single stage forming drum device according to the present invention;

Figure 2 is a side cross-sectional view showing a conventional forming drum device,

Figure 3 is an enlarged side cross-sectional view of a portion of the conventional forming drum device of FIG.

<Description of Drawing>

1 ... ball screw 2 ... air hole

3 ... bead holder 4 ... ball screw block

5 ... center segment 6 ... Turn-up bladder support space

7. Turn-up bladder support 8 ... Turn-up bladder

9 ... push bladder 10 ... drum

11 ... bead holder push block 12 ... main drum

13 ... tension ring 14 ... shoulder bladder

15 ... shoulder bladder support 16 ... slip

17 ... inner liner 18 ... carcass ply

19 ... bead

In order to achieve the above object, the present invention is inserted into the circumference of the drum shaft in which the ball screw is installed in the center and various air holes are formed, the semi-finished tire is installed around the drum divided left and right from the center segment, As the bead holder push block is advanced by the air supplied through the air hole, the bead holder is pushed up to support the bead, and the ball screw block is moved to the longitudinal center of the drum by the ball screw, and then the turn-up bladder support space The turn-up bladder support is rotated by the air supplied to the turn-up bladder, and the turn-up bladder is inflated by the air supplied to the inside of the center segment and the turn-up bladder. It is characterized by a configuration supporting from the side and bottom.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

Figure 1 shows the overall configuration of a single stage forming drum device for forming a tire according to the present invention.

The device is roughly divided into two parts: the drum shaft 10 and the main drum 12.

The drum shaft 10 is inserted into the main body of the shaft on which the various air holes 2 can be supplied and the main shaft 12 is moved into the main body of the shaft. Is installed.

The main drum 12 is composed of a center segment 5, a turn-up bladder support 7, a bead holder 3, a push bladder 9, and the like. The center segment 5 serves to maintain a flatness so that the ball screw block 4 is moved by the ball screw 1 so that semi-finished products of various tires can be flattened without interference. It is going to get up and down by city). The turn-up bladder support 7 is a structural support for the tire bead part, and is expanded and contracted by air supply. The bead holder 3 which firmly supports the beads in the vertical direction is expanded by an air supply, and is configured to be automatically reduced by a strong tension ring 13 when it is reduced. In addition, the turn-up bladder 8, which turns up the semi-finished products attached when the drum is reduced, is expanded by the supply of air and the exhaust is automatically made. And push bladder (9) which serves to reinforce while pushing the turn-up bladder (8) is expanded by the air supply like the turn-up bladder (8), the exhaust is made automatically.

Referring to the operation of the single-stage forming drum device of the present invention having the configuration described above in detail as follows.

In the upper part of the assembly diagram of FIG. 1, the 'A' state shows an initial state, and the 'B' and 'C' states of a lower part show a case in which a drum device operates.

Initially, the tire inner liner 17 and the carcass splice 18 semifinished product are attached to the drum 12, and the beads 19 are supplied to the bead holder 3 of the drum 12 by another vehicle.

Next, when air is supplied through the air hole 2 and pushes the bead holder push block 11, the push block 11 slides forward to raise the bead holder 3 so that the bead 19 is firmly supported. You can do it.

When the ball screw block 4 is moved by the rotation of the ball screw 1 primarily, the drum 12 divided on the left and right sides from the center segment 5 is appropriately centered as shown in the 'B' state in the figure. Move by distance and stop. When air is supplied to the turn-up bladder support space 6 at the stopped position, the turn-up bladder support 7 is rotated to stop at the proper position by a stopper, at which time the bead 19 is already fixed. ) The inside of semi-finished product is firmly supported. As shown in FIG. 1, the turn-up bladder support 7 is configured in the form of a hinge that is free to rotate about the horizontal axis.

When the ball screw block 4 is moved by the rotation of the ball screw 1 secondly, the drum 12 divided at the left and right sides of the center segment 5 is centered as in the 'C' state of FIG. Each stop by moving to the appropriate distance. When air is supplied to the inside of the center segment 5 at the stopped position, the inside of the green tire is firmly supported by the air inside the center segment 5 and the turn-up bladder support 7, and at the same time, the air to the turn-up bladder 8 is also provided. The injection causes the turn-up bladder 8 to swell outside the bead by a predetermined amount and stop. Immediately afterwards, when the air is supplied to the push bladder 9 to inflate, the turn-up bladder 8 is supported from the lower side and the side, and the semi-finished products such as the attached inner liner 17 and the carcass splice 18 are contracted. While turning up on the drum 12, the primary green tires are manufactured in the same shape.

When the green tire is completed as described above, the air is supplied to the air chamber to force the turn-up bladder support 7 to be forcibly reduced, thereby drawing out the green tire.

According to the present invention of the configuration as described above, it is possible to use only the mechanical structure without using the shoulder bladder, it is possible to improve the quality of the final product, reduce the defective rate, as well as reduce the cost and workability There is an advantage to improving.

Claims (2)

In the single stage molding drum device of a tire, A tire is provided around a drum 12 which is provided with a ball screw 1 at the center and is fitted around the drum shaft 10 where various air holes 2 are formed, and is divided left and right from the center segment 5 as a starting point. The semi-finished product is installed, and the bead holder push block 11 is advanced by the air supplied through the air hole 2 to push up the bead holder 3 to support the bead 19, and to the ball screw 1 After the ball screw block 4 is moved toward the longitudinal center of the drum 12, the turn-up bladder support 7 is rotated by the air supplied to the turn-up bladder support space 6, and the center segment ( 5) The turn-up bladder 8 is inflated by the air supplied to the inside and the turn-up bladder 8 so that the semi-finished product is turned up, and the push bladder 9 is expanded at the same time to turn the turn-up bladder 8 side and bottom. Single stage forming drum device, characterized in that supported by. In the molding method of the tire, The semifinished product of the tire is attached around the drum 12, Air is supplied through the air hole (2) to push up the bead holder (3) while the bead holder push block (11) moves forward, The ball screw block 4 moves in the longitudinal direction of the drum shaft 10 by the rotation of the ball screw 1, and the center segment 5 moves to the center of the drum 12 for a certain distance and then stops. Steps, Rotating the turn-up bladder support 7 at an angle by air supplied to the turn-up bladder support space 6; The ball screw block 4 is moved by the rotation of the ball screw 1 and at the same time the drum 12 is stopped after moving a predetermined distance toward the center; Expanding the turn-up bladder 8 and the push bladder 9 by air so that the semi-finished product is turned up; A method for forming a tire, characterized in that the air is supplied to the space (6) to forcibly reduce the turn-up bladder support (7) to draw out the green tires.