JP6993014B2 - Forward / backward drive device for forming drums - Google Patents

Description

The present invention relates to a beadlock forward / backward drive device for a molded drum, and more particularly to a drive device for moving the beadlock of a molded drum for molding a green tire forward / backward.

Unless otherwise indicated herein, the content described in this section is not prior art for the claims of this application and is not considered to be prior art as included in this section.

Tires are largely completed through four manufacturing processes such as refining, semi-finished products, molding, and vulcanization. First, a refining process is performed in which various rubbers and chemicals are mixed with a mixer to produce compounded rubber, and then the tread and sidewalls are injected with a certain width and thickness based on the tire specifications with the specified rubber. The extrusion process is performed. Next, the steel wire is coated with rubber, wound a predetermined number of times, and then a bead process is performed to attach the bead filler injected according to the standard, and all of the tread, sidewalls, beads, belts, carcass, etc. are performed. Green tires are manufactured through a molding process in which the semi-finished products of the above are sequentially assembled to make a green tire (usually called a "green case"). After that, the green tire is put into a mold and subjected to a predetermined temperature and pressure for a certain period of time to be finished through a vulcanization step in which a finished tire is manufactured.

The present invention attempts to disclose a molded drum used in the molding process during the tire manufacturing process described above, wherein the molding drum is a device for sequentially assembling all the materials used for the tire to make a cylindrical green tire. Therefore, there is a molded drum configured to contract or expand in the radial direction of the molded drum by being connected to a pulley connected to the drive motor by a transmission belt such as a timing belt and rotating. More specifically, in the molded drum drive device, the semi-finished products (carcass ply and inner liner) applied to the tire are wound around the molded drum, the beads are bonded, and the semi-finished products (carcass ply and inner liner) are compressed into a braider located on the side surface of the molded drum. When air is supplied to inflate the braider, the semi-finished product is turned up while wrapping the bead.

The bead is a portion that comes into direct contact with a rim that is a part of a wheel, and is formed in a ring shape in which a wire tied with a steel wire is wrapped with fibers and rubber. The bead plays a role of crimping a tire whose air pressure is kept constant to the rim so that air does not escape, and also plays a role of holding the tire from being removed from the rim even if the tire pressure suddenly decreases. Fulfill.

Here, in the turn-up process, first, the bead is coupled to the upper part of the molding drum drive device with the semi-finished product in a state where the semi-finished product is wound around the molding drum, and the bead lock piston advances while the bead lock. The semi-finished product is turned up while wrapping the bead by supplying compressed air to the braider with the shoulder linked to the shoulder support moving upward and supporting the side of the bead. Is done by.

However, since the bead does not completely adhere to the shoulder in the process of moving the shoulder upward to support the side surface of the bead, air flows between the bead and the semi-finished product, and the semi-finished product brings the bead and air together. Since the beads are not completely crimped onto the semi-finished product because they are turned up while being wrapped, there are problems that the performance of the product deteriorates and defective products occur.

Korean Patent No. 10-127258 (published on March 29, 2012)

An object of the present invention is to advance the beadlock toward the shoulder and turn up the bead in close contact with the tire semi-finished product before the braider expands and the tire semi-finished product is turned up while wrapping the bead. It is an object of the present invention to provide a beadlock forward / backward drive device for a molded drum for preventing air from flowing in between a bead and a semi-finished tire product.

Further, it is self-evident that other technical problems can be derived from the following explanations without being limited to the above-mentioned technical problems.

The forward / backward drive device for a molded drum according to an embodiment of the present invention is installed at the center of the molded drum main body where the tire semi-finished product is wound and the central portion of the molded drum main body, and is linked to the shoulder support. A shoulder portion that contracts or expands in the radial direction of the molded drum main body, and a bead lock portion that is installed on both sides of the shoulder portion and moves vertically in the radial direction of the molded drum main body according to the forward / backward movement of the bead lock piston. A turn-up braider unit that is installed on both sides of the beadlock portion and turns up both sides of the tire semi-finished product while wrapping the bead by supplying compressed air, and a turn-up braider portion that is installed on both sides of the molded drum main body and that is the molded drum main body. Includes a drive unit that moves the unit back and forth toward the shoulder unit.

According to a preferred feature of the present invention, the drive portion is installed in a cylinder portion extending along the length direction from the central axis of the molding drum main body portion and inside the cylinder portion, and the molding drum is provided. It is characterized by including a piston portion connected to one side of the main body portion and moving the molded drum main body portion back and forth by a piston movement.

According to a preferred feature of the present invention, the rotary cam drive portion extending to one side of the cylinder portion is further included, and the piston portion is formed from the rotational movement of the rotary cam installed inside the rotary cam drive portion. It is characterized in that the molded drum main body is advanced by applying pressure.

According to a preferred feature of the present invention, a lever drive unit extending to one side of the rotary cam drive unit is further included, and the shaft rotates with the shaft by the reciprocating motion of the shaft installed inside the lever drive unit. It is characterized in that the rotary cam is rotated while the cam lever connecting the cams to each other moves.

According to a preferred feature of the present invention, the tire senses the movement of the shoulder portion expanding in the vertical direction and transmits a signal to the drive portion so that the molded drum main body portion advances toward the shoulder portion. It is characterized by further including a control unit that transmits a signal to the drive unit so that when both side portions of the semi-finished product are turned up, the molded drum main body portion moves backward toward both sides.

According to a preferred feature of the present invention, the tire semi-finished product senses the movement of the shoulder portion expanding in the vertical direction and transmits a signal to the drive portion so that the shaft portion advances toward the shoulder portion. It is characterized by further including a control unit that transmits a signal to the lever drive unit so that the molded drum main body portion moves backward toward both sides when both side portions thereof are turned up.

The method of operating the forward / backward drive device for a molded drum according to an embodiment of the present invention is a first step of winding the tire semi-finished product around the molded drum main body and a second step of fixing the bead to the upper part of the tire semi-finished product. The third step in which the beadlock portion rises in the radial direction of the molded drum body portion while the beadlock piston advances, and the shoulder portion linked to the shoulder support expands in the radial direction of the molded drum body portion. A fourth step, a fifth step in which drive portions installed on both sides of the molded drum main body advance the molded drum main body toward the shoulder portion, and a fifth step in which compressed air is supplied to the turn-up braider portion. It is characterized by including a sixth step of turning up both sides of the tire semi-finished product while wrapping the bead.

According to the embodiment of the present invention, since the turn-up is performed in a state where the tire semi-finished product is tightly coupled between the shoulder and the bead, there is an advantage that the phenomenon of air filling can be prevented.

Further, according to the embodiment of the present invention, there is an advantage that the deterioration of the performance of the tire product or the occurrence rate of defective products can be minimized by preventing the inflow of air.

Further, according to the embodiment of the present invention, there is an advantage that the bead can be more easily tight-junctioned to the tire semi-finished product by easily advancing the molded drum device portion back and forth.

The effects of the present invention are not limited to the effects described above, but should be understood to include all effects that can be inferred from the detailed description of the invention or the constitution of the invention described in the claims. be.

It is a perspective view which shows the tire molded by the tire forming drum. It is sectional drawing of the beadlock forward / backward drive device which concerns on one Embodiment of this invention. It is an operation state diagram of the beadlock forward / backward drive device which concerns on one Embodiment of this invention. It is an operation state diagram of the beadlock forward / backward drive device which concerns on one Embodiment of this invention. It is an operation state diagram of the beadlock forward / backward drive device which concerns on one Embodiment of this invention. It is an operation state diagram of the beadlock forward / backward drive device which concerns on one Embodiment of this invention. It is an operation state diagram of the beadlock forward / backward drive device which concerns on one Embodiment of this invention. It is a conceptual diagram of the state where the beadlock is advanced in the beadlock forward / backward drive device which concerns on one Embodiment of this invention. It is sectional drawing of the state which includes the rotary cam drive part and the lever drive part in the beadlock forward / backward drive device which concerns on one Embodiment of this invention.

Hereinafter, the configuration, operation, and operation / effect of the beadlock forward / backward drive device according to the preferred embodiment will be described with reference to the accompanying drawings. By the way, in the following drawings, each component is omitted or schematically illustrated for convenience and clarity, and the size of each component does not reflect the actual size. do not have. Also, throughout the specification, the same reference numerals refer to the same components, and the drawing numerals for the same configurations are omitted in each drawing.

FIG. 2 shows a cross-sectional view of a beadlock forward / backward drive device according to an embodiment of the present invention, and FIGS. 3a to 3e show operating state diagrams.

The forward / backward drive device for a molded drum according to an embodiment of the present invention is installed at the center of the molded drum main body 10 where the tire semi-finished product is wound and the central portion of the molded drum main body 10, and is linked to the shoulder support 21. A shoulder portion 20 that contracts or expands in the radial direction of the molded drum main body 10 and is installed on both sides of the shoulder portion 20 in the radial direction of the molded drum main body 10 according to the forward and backward movement of the beadlock piston 31. A beadlock portion 30 that moves vertically, a turn-up braider portion 40 that is installed on both sides of the beadlock portion 30 and turns up both sides of the tire semi-finished product while wrapping the bead by supplying compressed air, and the molded drum body. It includes a drive unit 50 which is installed on both sides of the unit 10 and causes the molded drum main body portion 10 to move forward and backward toward the shoulder portion 20.

First, the molded drum main body 10 can have a cylindrical drum structure, and has a structure that contracts or expands in the radial direction about the rotation axis while rotating by the power transmitted via the rotation axis. Can be done. A tire semi-finished product including a carcass ply and an inner liner is wound on the molded drum main body 10, and the inner liner is composed of the innermost rubber layer of the tire and is configured to maintain the air of the tire. Carcus means a cord layer made of fibers, steel, etc. inside the tire, and forms the skeleton of the tire. The bead is coupled onto the tire semi-finished product in a state where the tire semi-finished product is wound around the molded drum main body 10. The bead is configured to wrap the end of the cord and attach the tire to the rim, and can be fixed on both sides for a certain period of time from the side of the wound tire semi-finished product, and then turned up by a turn-up braider. While being done, the bead is wrapped to form the structure shown in FIG.

Next, the shoulder portion 20 is installed in the center of the molded drum main body portion 10, is linked to the shoulder support 21, and is configured to be retractable or expandable along the radial direction from the central axis by the operation of the link. Here, the initial shape of the green tire is created while the shoulder portion 20 is expanded by the operation of the shoulder support 21.

Further, the beadlock portion 30 which is installed on both sides of the shoulder portion 20 and vertically moves in the radial direction of the molded drum main body portion 10 according to the forward / backward movement of the beadlock piston 31 is further included. The beadlock portion 30 can be installed at a predetermined distance from the shoulder portion 20 along both sides of the molded drum main body portion 10, and then the bead is coupled to the beadlock portion 30 with the tire semi-finished product sandwiched between them. By doing so, the bead is fixed. The beadlock portion 30 can be vertically moved along the radial direction from the central axis by the forward / backward movement of the beadlock piston 31 configured inside the molded drum main body portion 10.

Further, it further includes a turn-up braider unit 40 which is installed on both sides of the bead lock portion 30 and turns up both sides of the tire semi-finished product while wrapping the bead by supplying compressed air. The turn-up braider portion 40 is installed on both sides of the beadlock portion 30, and an elastic material such as leather or synthetic resin can be used so as to expand by being supplied with compressed air. Air is injected into the turn-up braider unit 40, and both sides of the tire semi-finished product are turned up while wrapping the beads.

Finally, it can include a drive unit 50 which is installed on both sides of the molded drum main body 10 and moves the molded drum main body 10 back and forth toward the shoulder portion 20. The drive unit 50
Is a configuration for advancing the molded drum main body 10, that is, the body housing itself from the outside of the drum toward the center, and is configured to be installed on both sides of the molded drum main body 10 and pressurized. can.

According to a preferred feature of the present invention, the drive portion 50 is installed inside the cylinder portion 51 extending along the length direction from the central axis of the molded drum main body portion 10 and inside the cylinder portion 51. It is characterized by including a piston portion 53 which is connected to one side of the molded drum main body 10 and moves the molded drum main body 10 back and forth by a piston motion.

As an embodiment for pressurizing the molded drum main body 10, a piston cylinder structure can be provided. More specifically, the drive portion 50 can include a cylinder portion 51 that extends along the length direction from the central axis of the molded drum main body portion 10 and forms a space in which a piston movement is possible. .. The molded drum main body 10 can be driven forward and backward by a piston portion 53 installed inside the cylinder portion 51 and reciprocating along the axial direction.

According to a preferred feature of the present invention, the rotary cam drive portion 55 extending to one side of the cylinder portion 51 is further included, and from the rotational movement of the rotary cam 56 installed inside the rotary cam drive portion 55. The piston portion 53 is pressurized to advance the molded drum main body portion 10.

As a configuration for facilitating the operation in which the drive unit 50 is driven forward and backward by the piston movement, the rotary cam drive is extended to the outside of the cylinder unit 51 and a predetermined space in which the cam can rotate is formed inside. The unit 55 can be included. Inside the rotary cam drive unit 55, a rotary cam 56 that rotates around an axis can be installed, and the rotary cam is preferably elliptical in shape, and one side of the piston portion 53 is added by rotation. The piston portion 53 advances while pressing.

According to a preferred feature of the present invention, the lever drive unit 57 extending to one side of the rotary cam drive unit 55 is further included, and the reciprocating motion of the shaft 58 installed inside the lever drive unit 57 causes the reciprocating motion of the shaft 58. The rotary cam 56 is characterized in that the rotary cam 56 is rotated while the cam lever 59 connecting the shaft 58 and the rotary cam 56 to each other moves.

Here, as a configuration for facilitating the drive for rotating the rotary cam 56, a lever drive unit 57 extending to one side of the rotary cam drive unit 55 can be included. The lever drive unit 57 has a shaft 58 that makes a linear reciprocating motion inside, and the rotary cam 56 is rotated while being driven by a cam lever 59 that connects the rotary cam 56 and the shaft 58 to each other by the linear motion of the shaft. As a result, the piston portion 53 can be pressurized to advance the molded drum main body portion 10.

According to a preferred feature of the present invention, the shoulder portion 20 senses the vertical expansion movement and transmits a signal to the drive portion 50 so that the molded drum main body portion 10 advances toward the shoulder portion 20. Further, when both side portions of the tire semi-finished product are turned up, the molded drum main body portion 10 further includes a control unit that transmits a signal to the drive unit 50 so as to move backward toward both sides.

According to a preferred feature of the present invention, the shoulder portion 20 senses the vertical expansion movement and transmits a signal to the drive portion 50 so that the shaft 58 advances toward the shoulder portion 20. It is characterized by further including a control unit that transmits a signal to the lever drive unit 57 so that when both side portions of the tire semi-finished product are turned up, the molded drum main body portion 10 moves backward toward both sides.

The control unit is a drive unit so that the molded drum main body 10 moves forward toward the shoulder portion 20 after receiving a signal for a specific process in the process of molding the green tire with the tire semi-finished product. It plays a role of transmitting an operation signal to the 50. More specifically, the control unit transmits an operation signal to the drive unit 50 in a state where the bead lock portion 30 rises in the radial direction and the shoulder portion 20 expands while the side surface and the lower portion of the bead are supported. The molded drum main body 10 can be made to move forward toward the shoulder portion 20, and a signal is transmitted to the lever drive portion 57 extending to the drive portion 50 so that the shaft 58 moves forward. Can be done. As a result, air is released to the outside while the bead is in close contact with the tire semi-finished product and the shoulder, and then when the bead is turned up while being wrapped by the turn-up braider unit 40, the inside is not filled with air. By manufacturing green tires, it is possible to improve the performance of the product and minimize the occurrence of defect rate.

The method of operating the forward / backward drive device for a molded drum according to an embodiment of the present invention is a first step (s10) in which the tire semi-finished product is wound around the molded drum main body 10, and the bead is fixed to the upper part of the tire semi-finished product. The beadlock portion 30 is linked to the shoulder support 21 with the second step (s20) of causing the beadlock piston 31 to move forward and the third step (s30) in which the beadlock portion 30 rises in the radial direction of the molded drum main body portion 10. The fourth step (s40) in which the shoulder portion 20 expands in the radial direction of the molded drum main body 10, and the drive portions 50 installed on both sides of the molded drum main body 10 face the molded drum main body 20 toward the shoulder portion 20. The fifth step (s50) for advancing the 10 and the sixth step (s60) for turning up both sides of the tire semi-finished product while wrapping the bead by supplying compressed air to the turn-up braider unit 40 are included. It is characterized by that.

Next, the operation method by the above-mentioned forward / backward drive device for the molded drum will be described. First, a first step (s10) of winding the tire semi-finished product including the inner liner and the carcass ply on the molded drum main body 10 and a second step (s20) of fixing the bead to the upper part of the tire semi-finished product are performed. Here, the bead is fixed by sandwiching the tire semi-finished product at a position corresponding to the bead lock portion 30 formed on the molded drum main body portion 10, and then the bead lock piston 31 advances toward the shoulder portion 20. The beadlock portion 30 rises in the radial direction and goes through a third step (s30) of pushing the bead upward. Next, the shoulder portion 20 linked to the shoulder support 21 supports the side surface of the bead while expanding in the radial direction of the molded drum main body portion 10 (fourth step (s40)). The problem that a predetermined space is formed between the bead and the bead and the inside is filled with air may occur. In order to prevent this, the bead passes through the fifth step (s50) in which the drive portions 50 installed on both sides of the molded drum main body 10 advance the molded drum main body 10 toward the shoulder portion 20, and the bead is a shoulder portion. After being tightly coupled to 20, air is supplied to the turn-up braider unit 40, and the process proceeds to the sixth step (s60) in which both sides of the semi-finished product are turned up while wrapping the beads. After that, the turn-up braider unit 40 returns to the original position, and while the drive unit 50 moves backward, the shoulder unit 20 and the tire semi-finished product wrapping the bead are separated by a predetermined distance, and the shoulder unit 20 and the bead lock unit 30 are sequentially lowered. This will eventually produce green tires.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the embodiments described herein and the configurations shown in the drawings are merely the most preferred embodiments of the present invention. It should be understood that at the time of this application, there may be various equivalents and variants that can replace them, as they do not represent all the technical ideas of the present invention. Therefore, it should be understood that the embodiments described above are exemplary in all respects and are not limiting, and the scope of the present invention is not a detailed description but claims described below. It should be construed that the meaning and scope of the claims, and all modifications or variations derived from the equivalent concept thereof, which are defined by the scope, are included in the scope of the present invention.

10 Molded drum body 20 Shoulder 21 Shoulder support 30 Beadlock 31 Beadlock piston 40 Turn-up braider 50 Drive 51 Cylinder 53 Piston 55 Rotating cam drive 56 Rotating cam 57 Lever drive 58 Shaft 59 Cam lever

Claims (2)

A pair of molded drum bodies from which semi-finished tires are wound, and
When the shoulder support is installed in the central portion between the pair of molded drum main bodies and is linked to the shoulder support and the shoulder support moves forward and backward along the axial direction of the pair of molded drum main bodies, the pair is actuated by the operation of the link. A pair of shoulder parts that contract or expand in the radial direction of the molded drum body,
A pair that is installed on both sides of the pair of shoulder portions while being installed on the pair of molded drum main bodies and vertically moves in the radial direction of the pair of molded drum main bodies in response to the axial forward and backward movement of the beadlock piston. Beadlock part and
With a pair of turn-up braiders that are installed on both sides of the pair of beadlocks while being installed on the pair of molded drum bodies, and turn up both sides of the tire semi-finished product while wrapping the beads by supplying compressed air. ,
It includes a pair of drive portions that are installed on both sides of the pair of molded drum main bodies and that move the pair of molded drum main bodies back and forth along the axial direction toward the shoulder portion.
The shoulder supports are installed on both sides of the pair of shoulder portions, and function to contract or expand the shoulder portions in the radial direction while moving forward and backward toward the shoulder portions. ,
The drive unit
A cylinder portion extending along the length direction from the central axis of the pair of molded drum main bodies, and a piston movement installed inside the cylinder portion and connected to one side of the pair of molded drum main bodies. Includes a piston portion that advances the pair of molded drum main bodies back and forth.
Further including a rotary cam drive portion extending to one side of the cylinder portion.
The piston portion is pressurized from the rotational movement of the rotary cam installed inside the rotary cam drive portion to advance the pair of molded drum main bodies.
Further including a lever drive unit extending to one side of the rotary cam drive unit,
The reciprocating motion of the shaft installed inside the lever drive unit causes the rotary cam to rotate while the cam lever connecting the shaft and the rotary cam to each other moves. Drive device. Sensing the movement of the shoulder portion expanding in the vertical direction, a signal is transmitted to the drive portion so that the pair of molded drum main bodies advance toward the shoulder portion, and both side portions of the tire semi-finished product. The molded drum according to claim 1 , further comprising a control unit that transmits a signal to the drive unit so that the pair of molded drum main bodies move backward toward both sides when turned up. Forward / backward drive device.

Images