KR0151661B1 - Apparatus and method for a molding drum of green tire - Google Patents

Abstract

The present invention relates to a forming drum device and a forming method of a green tire which prevents unbalanced expansion during manufacturing of green tires, and improves the uniformity of tires, and includes a rotating shaft (3) installed across the center support (1) of both drum bodies (2). Screw nut 6 with a slider ring 5 freely moving left and right along the longitudinal direction of the rotary shaft 3 is installed in the spiral portion 4 of the spiral shaft 4, and the slider ring 5 of this screw nut 6 is provided. An air injection cylinder 9 is installed in the bead lock clamp 7 and the connecting piece 8 via the bead lock clamp 7, and the bead lock clamp 7 contacts the elevating member 11 having the inclined surface 10. The drum wing 12 is fastened via the housing 13 and the bolt 14, and the bladder 16 connected to the air injection passage pipe 15 is connected to an upper surface of the drum wing 12. It is connected to the bladder clamp (17).

Description

Green drum molding drum device and molding method

The present invention relates to a forming drum device and a forming method thereof used in a tire forming process, and more particularly to a forming drum device and a forming method of a green tire to prevent unbalanced expansion during green tire molding to improve the uniformity of the tire.

In general, the molding process of tires is an important process that determines the quality of tires by attaching all the constituent materials sequentially in a molding machine to make cylindrical green tires. The flat drum of the forming drums used in the molding process The device attaches the inner liner, sidewall, and carcass of the tire on this flat drum in a circumferential manner, and when the bead enters the middle of the drum, it partially expands from the inside of the drum to join the bead and carcass. While the bead portion moves inward to inject air from the inside of the drum and simultaneously injects air to the outer bled to form a donut-shaped green tire. However, such a conventional molding apparatus has a bead and a car around the bead. Right angles of the beads, where the casing is not tightly bonded and greatly affects the performance of the tire Two days not politics as a green tire according to the Bled quality uniformity is reduced in its circumferential end there is a problem that degrades the quality of the finished tire.

Accordingly, the present invention was invented to solve the above-mentioned drawbacks, which can improve the uniformity by preventing the circumferential unbalanced expansion of the green tire during the molding process while preventing the formation of internal residual air, which is a defective element of the finished tire. It is an object of the present invention to provide a green drum forming drum device and a forming method thereof.

Scheme 1 is an overall cross-sectional view of the forming drum device of the green tire according to the present invention,

Drawings 2a to 2f are sectional views showing the state in which the green tire is manufactured by the molding drum device of the present invention.

* Explanation of symbols for main parts of the drawings

1: center support 2: drum body

3: axis of rotation 4: spiral upper portion

5: slider ring 6: screw nut

7: Bead lock clamp 8: Connection

9: air injection cylinder 10: inclined surface

11: lifting member 12: drum wing

13: housing 14: bolt

15: air injection passage 16: bladder (Bladder)

17: bladder clamp 18: push rod

19: Stitching Roller

20: air injection passage 21: carcass

22: Bead 23: Sidewall

24: inner liner 25: bead ring

In order to achieve the above object, the present invention provides a screw nut having a slider ring that freely moves left and right along a longitudinal direction of the rotating shaft, the spiral portion of the rotating shaft installed across the center of the drum body having a central support, The slider of the screw nut is provided with an air injection cylinder connected to the bead locking clamp and the connecting piece. The bead locking clamp is bolted to the housing and the drum wing contacting the elevating member having the inclined surface. The upper side of the drum wing has a structure in which the bleed connected to the air injection passage pipe is connected to the bleed clamp and settled.

In another aspect, the present invention, the inner liner and carcass is placed in a cylindrical shape on the bladder wrapped around the drum wing, and the bundle of the bead locking clamp and bladder clamp while moving toward the center support symmetrically from side to side by the action of the slider The drum wing expands circumferentially outward to form a carcass in a step shape, The beads are attached by force bonding from the outside of the drum wing by a bead ring, and the air injected through the air injection pipe expands the bladder. The carcass outside the bead is placed on the surface of the bladder, covering the top of the bead and pushing the donut-shaped bladder with the swelling of the push rod to fully join the carcass and bead vertices to the carcass on the drum wing. Turn up step, the step of completely attaching the sidewall on the carcass via a squelch roller, and the drum The bead locking clamp located at the bottom of the cylinder expands circumferentially by the air injection cylinder's air injection, fixing the bottom of this bead combined with the surface of the bladder together with the bite, carcass, innerliner and sidewall and screw nut By injecting air into the air injection passage while moving the left and right drum body in the inward direction toward the center support by the rotation of the expansion to complete the cylindrical green tire.

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

1 is an overall cross-sectional view of a forming drum device for a green tire according to the present invention, and FIGS. 2A to 2F are operation cross sections showing the steps in which the green tire is molded by the forming drum device.

As shown in the figure, the present invention has a longitudinal direction of the rotary shaft 3 in a spiral portion 4 of the rotary shaft 3 provided across the central portion of the drum body 2 which is symmetrically equipped with the central support 1. A screw nut (6) having a slider ring (5) which moves freely from side to side is installed, and the slider ring (5) of the screw nut (6) is connected by means of a bead locking clamp (7) and a connecting piece (8). An air injection cylinder 9 to be installed is installed, and the bead locking clamp 7 is provided with a housing 13 and a bolt 14 provided with a drum wing 12 contacting the elevating member 11 having an inclined surface 10. And a bladder 16 connected to the air injection passage pipe 15 is connected to the bladder clamp 17 on the upper surface side of the drum wing 12.

Then, when the bladder 16 is swollen, a well-known push rod 18 reciprocating left and right in order to join the vertices of the carcass 21 and the bead 22 of the green tire is provided on the outside of both drum bodies 2. It is installed, and the squaring roller 19 is selectively accessible to and spaced apart from the drum body 2 to attach the sidewall 23 on the carcass 21 of the green tire.

In addition, the air injection cylinder 9 is configured to blow air into the inside of the drum body 2 in an expansion step to be described later, as the air injection passage 20 through which external air can be introduced is formed.

Next, a method of forming the green tire according to the present invention will be described. The present invention includes the steps of placing the inner liner 24 and the carcass 21 in a cylindrical shape on the bladder 16 surrounding the drum wing 12 (FIG. 2A). In this case, the sidewall 23 may be previously attached to the inner liner 24 and placed together with the carcass 21 according to the type of tire.

The drum wing 12 while the bead locking clamp 7 and the bladder clamp 17 are moved symmetrically from side to side toward the center support 1 by the action of the slider ring 5 moving along the rotation axis 3. ) Expands circumferentially outward to form a carcass 21 in a stepped shape (see FIG. 2B), by which the bead 22 is forcedly adhered from the outside of the drum wing 12 by the bead ring 25. In the attaching step (see FIG. 2C), the air injected through the air inlet passage 15 expands the bladder 16 and the carcass 21 outside the bead 22 is transferred to the bladder 16. Push the donut-shaped bladder 16 in which the push rod 18 swells while covering the upper side of the bead 22 on the surface of the carcass 21 and the tip of the bead 22 drum wing ( 12) The turn up step of joining the carcass 21 above (see FIG. 2D), and the sidewalls 23 on the carcass 21 are quenched by the roller 19. (22e) and the bead lock clamp 7 located below the drum wing 12 is expanded circumferentially by the air injection of the air injection cylinder 9, The lower surface of the bead 22, which is combined with the carcass 21, the inner liner 24 and the sidewall 23, is fixed together with the surface of the bladder 16, and left and right by the rotation of the screw nut 6 Injecting air into the air injection passage 20 while moving the drum body (2) inward toward the center support (1) is made of a step of expanding tightly (see Fig. 2f).

As described above, the green tire manufactured according to the present invention not only does not allow residual air to remain between the components of the bead portion accurately, but also prevents the green tire from unintentionally expanding in the circumferential direction. Accordingly, the tire has an advantage of increasing uniformity.

Claims (3)

In a drum device in which a bead, a carcass, an inner liner, and a sidewall are formed around a drum body to form a green tire, a spiral shape of a rotating shaft 3 provided across the center support 1 of both drum bodies 2 is provided. A screw nut 6 having a slider ring 5 freely moving left and right along the longitudinal direction of the rotary shaft 3 is provided in the portion 4, and a bead lock is provided in the slider ring 5 of the screw nut 6. An air injection cylinder 9 is installed to be connected via a clamp 7 and a connecting piece 8, and the bead locking clamp 7 is in contact with a lifting member 11 having an inclined surface 10. Bladder 16 is fastened to the upper side of the drum wing 12, the bladder 16 is connected to the housing 13 and the bolt (14) is installed is connected to the air injection passage pipe (15) Molding device of the green tire, characterized in that made in connection with (17). 2. The molding drum device of claim 1, wherein an air injection passage (20) is formed in the air injection cylinder (9) to inject air into the drum body (12). In the method of forming green tires with beads, carcass, inner liner and sidewalls attached around the drum body, the inner liner 24 and the carcass 21 on the bladder 16 wrapped around the drum wing 12 are formed. Is placed in a cylindrical shape, the center support (1) symmetrically from side to side by the action of the slider ring (5), the bundle of the bead locking clamp (7) and the bladder clamp (17) moves along the rotation axis (3) The drum wing 12 expands circumferentially outward while moving toward the step to form a carcass 21 in a step shape, and the bead ring 22 is bent from the outside of the drum wing 12 by the bead ring 25. Attached by forced adhesion, the air injected through the air inlet passage 15 expands the bladder 16 and the bead outer carcass 21 is placed on the surface of the bladder 16 A donut shaped bladder (1) in which a swell 18 is swollen while covering the top of the bead 22 6) push the tip of the carcass 21 and the bead 22 to the carcass 21 on the drum wing 12, the turn-over step, the side wall 23 on the carcass 21 Completely attaching to the quenching roller 19 and the bead lock clamp 7 located below the drum wing 12 expands circumferentially by the air injection of the air injection cylinder 9, so that the bead 22, the car The lower surface of the bead 22 combined with the cas 21, the inner liner 24, and the sidewall 23 is fixed together with the surface of the bladder 16, and the left and right drum bodies are fixed by the screw nut 6. 2) The method of forming a green tire, characterized in that consisting of the step of expanding while moving inwards toward the center support (1).