MULTI BEAD TYPE GREENTIRE MANUFACTURING APPARATUS

Disclosed herein is a multi bead type greentire manufacturing apparatus. The apparatus includes a rubber plate made from a raw material of the greentire and mounted on a winding drum. Additionally, a plurality of gloves and bladders are formed separately to transform the rubber plate (91), thereby automating a manufacturing process of a large-scale greentire having multi-layer beads. The multi bead type greentire manufacturing apparatus increases the productivity of large sized greentires and reduces an error rate in forming the greentires by increasing forming accuracy.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

Reference will be now made in detail to the exemplary embodiment of the present invention with reference to the accompanying drawings.

FIG. 6is an exemplary view showing the outward appearance of a multi bead type greentire manufacturing apparatus according to the present invention, andFIG. 7is an exemplary sectional view of the multi bead type greentire manufacturing apparatus. As shown inFIGS. 6 and 7, the multi bead type greentire manufacturing apparatus according to the present invention may include: a winding drum10on which a rubber plate91is wound at a central portion thereof; an inner bladder41and an outer bladder42formed as ring-shaped pockets and mounted around both side end portions of the winding drum10, wherein the inner and outer bladders are expandable and contractible by fluid pressure; and a plurality of inner gloves31and outer gloves32mounted inside the winding drum10at a front end side of the inner bladder41, wherein the inner gloves31and outer gloves32protrude radially from a central shaft of the winding drum10.

In other words, as shown inFIG. 7, the entire cylindrical bodies including the winding drum10are joined concentrically and have horizontal and bilateral symmetry relative to the central shaft. In addition, the tire manufacturing apparatus is partially illustrated inFIG. 8, excluding the parts in symmetry in a longitudinal section.

As shown inFIGS. 6 to 8, the winding drum10may be divided into two parts, and an inner drum20may be mounted inside the winding drum10, to allow the entire cylindrical body of the winding drum to expand and contract. In other words, the divided winding drums10disposed at both sides of the inner drum20may be gradually separated and gradually contracted toward each other in an axial direction. As shown inFIGS. 7 and 8, a spiral shaft25arranged concentrically with the winding drum10and the inner drum20may be connected to communicate with a conveying nut19connected to the winding drum10, and a motor27may be connected to one end of the spiral shaft25. Accordingly, when the motor27rotates, the divided winding drums10are gradually separated and gradually contracted toward each other as the conveying nut19moves along the rotating spiral shaft25. Such an axial movement of the winding drum10may be applied to various devices performing rectilinear movement, such as racks and pinions, hydraulic cylinders, pneumatic cylinders, and the like.

In other words, as shown inFIG. 8, an outer hollow shaft11formed concentrically with the winding drum10may be disposed at the central portion of the winding drum10, and a plurality of inner hollow shafts21formed concentrically with the winding drum10and the inner drum20may be respectively disposed at both sides of the central portion of the inner drum20. In addition, the outer circumferential surface of the inner drum20maintains contact with the inner circumferential surface of the winding drum10as the inner drum moves, to join the inner hollow shaft21to the outer hollow shaft11. The spiral shaft25which rotates by a motor27may be mounted at the central portion of the inner hollow shaft21, and thus, when the spiral shaft25rotates, the conveying nut19moves in an axial direction of the spiral shaft25.

Moreover, an inner bladder41and an outer bladder42may expand and contract according to transfer or suction of working fluid, such as compressed air, and are mounted concentrically with the winding drum10at the side end portion of the winding drum10. As shown inFIG. 8, the outer bladder42may be spaced from an exterior side of the inner bladder41to surround the inner bladder41, and the outer bladder42may be mounted on a reciprocating bar50joined to the outer hollow shaft11at the side end of the winding drum10. Furthermore, a reciprocating actuator59configured to perform rectilinear movement, such as hydraulic cylinders or pneumatic cylinders, may be connected to the reciprocating bar50, to move the reciprocating bar50and the outer bladder42in the axial direction of the winding drum10when the reciprocating actuator59is expanded or contracted.

As shown inFIGS. 7 and 8, an inner glove31may be disposed at the middle side of the winding drum10of the front end side of the inner bladder41, and an outer glove32may be disposed at the inner bladder side. The inner glove31and the outer glove32may be separately protruding from the winding drum10or may extend into the winding drum10. The inner glove31may be driven by a plurality of expansion actuators39connected to the inner glove31, and the outer glove32may be driven by the expansion actuators39connected to the outer glove32.

FIG. 9is a sectional view taken along the line of A-A′ ofFIG. 7. As shown inFIG. 9, disc bodies of the outer glove32and the inner glove31may be divided at substantially equal angles and radially arranged on the central shaft of the winding drum10, and thus, the diameters of assemblies of the outer glove32and the inner glove31may be respectively increased or decreased according to the expansion and contraction of the expansion actuators39.

Moreover, as shown in the drawings, the inner glove31may be divided into two portions, and may include a first inner glove31adisposed at the middle side of the winding drum10and a second inner glove31bdisposed near the outer glove32, wherein the first inner glove31aand the second inner glove31bmay be separately driven by the expansion actuators39connected thereto. However, the first and the second inner gloves31aand31bmay manage the inner glove31according to standards and materials of the greentire to be formed. In other words, when a small-sized or simple structure greentire is to be formed, the first and the second inner gloves31aand31bmay be combined to form one inner glove.

FIGS. 10 and 11illustrate a process of forming the greentire using the inner layer rubber plate92, the beads95, and the outer layer rubber plate93of the multi bead type greentire manufacturing apparatus according to an exemplary embodiment of the present invention.

First,FIG. 10illustrates a process of winding the inner layer rubber plate92and the outer layer rubber plate93, which are raw materials of the greentire, onto the outer circumferential surface of the winding drum10. In the upper figure ofFIG. 10, the reciprocating actuator59may be expanded, thereby moving the outer bladder42to expose the inner bladder41. Furthermore, once the inner bladder41is exposed, the inner layer rubber plate92may be wound onto the outer circumferential surface of the winding drum10and onto the surface of the inner bladder41. After the inner layer rubber plate92is wound onto the winding drum10, as shown in the lower figure ofFIG. 10, the reciprocating actuator59may be contracted to laminate the outer bladder42onto the surface of the inner layer rubber plate92, and the outer layer rubber plate93may be wound onto the surface of the inner layer rubber plate92and onto the surface of the outer bladder42. Furthermore, the plurality of beads95may be mounted on the outer circumferential surface of the wound outer layer rubber plate93.

Through the above process, when the raw materials of the greentire are mounted on the greentire manufacturing apparatus, the greentire may be formed, as shown inFIG. 12, through the automated process illustrated inFIG. 11.

The upper figure ofFIG. 11, shows the forming process of the greentire of the multi-layer bead structure according to the present invention. When the spiral shaft25is rotated to move the conveying nut19, the laminated body of the inner layer rubber plate92and the outer layer rubber plate93may be transformed and the outer diameter of the laminated body may be expanded while the winding drums10contract toward each other, and simultaneously, the inner glove31, disposed in the winding drum10below the beads95, protrudes outwardly and presses and supports the inner circumferential surface of the wound inner layer rubber plate92. Additionally, a part of the outer layer rubber plate93wound on the surface of the outer bladder42may fold around the plurality of beads95as a reciprocating actuator39and the outer bladder expand.

Moreover, as shown in the middle figure ofFIG. 11, when the working fluid of the outer bladder42is suctioned, the outer bladder42is contracted and the reciprocating actuator39expands, thereby moving reciprocating bar50and the outer bladder42to expose the inner bladder41. In response the movement of the reciprocating actuator39and the transfer of the working fluid to the inner bladder41, thereby expanding the inner bladder41, the exposed inner rubber layer plate92may fold over the beads95. Furthermore, the beads95may be substantially closely mounted on the surface of the outer layer rubber plate93surrounding the existing beads95.

As described above, the multi bead type greentire manufacturing apparatus according to the present invention may automate the manufacturing process of the large-sized greentire having the multi-layer bead structure, and may thus, increase the productivity of the large-sized greentires and reduce an error rate in forming the greentires by securing accuracy in forming.