JP6790469B2 - Tire vulcanization container - Google Patents

Description

The present invention relates to a tire vulcanization container, and more particularly to a tire vulcanization container capable of reducing wear of components and suppressing loss of thermal energy.

The sectional type tire mold has a plurality of sector molds assembled in an annular shape and a pair of upper and lower side molds in an annular shape. The tire vulcanization container in which this tire mold is installed is equipped with a segment attached to the outer peripheral surface of each sector mold, an elevating plate on which the segment is suspended and an upper side mold is attached, and a lower side mold. It is equipped with a bottom plate that can be vulcanized and a container ring that moves up and down. The outer peripheral slope of the segment and the inner slope of the container ring are slidably engaged.

By moving the elevating plate downward, the segment is placed on the bottom plate. In this state, as the container ring moves downward, the segment sandwiched between the upper and lower plates of the elevating plate and the bottom plate moves forward with respect to the annular center line while sliding, and the sector mold is assembled in an annular shape. The mold closes. When the container ring moves upward, the sector mold assembled in an annular shape retracts with respect to the annular center line and becomes an open mold (see, for example, Patent Document 1).

Since each segment is strongly pressed by the elevating plate and is sandwiched between the elevating plate and the bottom plate, the wear becomes remarkable due to the repeated sliding movement. The greater the pressing force of the elevating plate, the greater the amount of wear on the segment and the more likely it is to deform. Further, when this pressing force acts unevenly on the segment, uneven wear occurs on the segment. When the segments are worn or deformed in this way, the closed tire mold is displaced, which causes a problem that steps and burrs are generated on the vulcanized tire. Further, sliding members such as the metal plate on the lower surface of the elevating plate and the upper surface of the bottom plate and the metal plate on the inner peripheral surface of the container ring also wear and deform with time, which also causes a problem.

Further, in the state before the segment suspended from the elevating plate is placed on the bottom plate, heat from the bottom plate is not transferred to the segment. Therefore, the heat supply from the bottom plate to each sector mold is also cut off. Therefore, even if the bottom plate is heated, the heat energy is not effectively used for heating the sector mold, resulting in loss.

Japanese Unexamined Patent Publication No. 2001-26020

An object of the present invention is to provide a tire vulcanization container capable of reducing wear of components and suppressing loss of thermal energy.

In order to achieve the above object, the ear vulcanization container of the present invention includes a segment attached to the outer peripheral surface of each of a plurality of sector molds arranged in an annular shape, an elevating plate to which an upper side mold is attached, and a lower side mold. A bottom plate to which a tire is attached and a container ring that moves up and down are provided, and an inner circumference of the container ring that moves downward on an outer peripheral inclined surface of each of the segments sandwiched between the elevating plate and the top and bottom of the bottom plate. By pressing with the inclined surface, each of the sector molds is advanced with respect to the annular center line and moved to the closed mold position, and these sector molds are assembled in an annular shape to close the tire mold. in the tire vulcanizing container, a state that each of said segments is always placed on the bottom plate, comprises a segment moving unit for advancing and retracting movement of the segments relative to the annular center line, moving part is the segment A moving cylinder housed in a buried space formed in the bottom plate and moving up and down, and a link mechanism connected between the moving cylinder and the outer peripheral surface of each of the segments are provided. The link mechanism is detachably and rotatably connected to the outer peripheral surface of each of the segments, and is arranged between the arm and the moving cylinder and rotatably connected to the moving cylinder. Each of the sector molds is brought to a temporarily closed position by having an arm and advancing each of the segments with respect to the annular center line via the link mechanism as the moving cylinder moves up and down. The segment is moved so as to be sandwiched between the upper and lower sides of the elevating plate and the bottom plate, and the outer peripheral inclined surface of each of the segments in this state is moved downward to the inner peripheral inclined surface of the container ring. It is characterized in that each sector mold is moved to the closed position by pressing with a tire.

According to the present invention, even when the tire mold is opened, each of the segments is always placed on the bottom plate. Therefore, heat is supplied from the bottom plate to each sector mold through the segments. As a result, the thermal energy from the bottom plate can be effectively used for heating the sector mold.

By moving each segment using the segment moving portion, each sector mold is moved to the temporarily closed mold position. Then, the outer peripheral inclined surface of each segment sandwiched between the upper and lower plates of the elevating plate and the bottom plate is pressed by the inner peripheral inclined surface of the container ring that moves downward, and each sector mold is moved to the closed position. Assemble in a ring shape and close the tire mold. That is, the container ring and each segment come into contact with each other and slide only when the sector mold moves between the temporarily closed mold position and the closed mold position. In addition, the sector mold is in the temporarily closed position and the closed position when it is pressed by the container ring and each segment is sandwiched between the elevating plate and the bottom plate and slides in contact with each plate. Only when moving between. Therefore, it is advantageous to reduce the wear of the segment, the container ring, the elevating plate and the bottom plate as compared with the conventional case.

It is a left half vertical cross-sectional view which illustrates the container for tire vulcanization of this invention in an open state. It is explanatory drawing which illustrates the sector mold, segment and the lower side mold of FIG. 1 in a plan view. It is a left half vertical cross-sectional view which illustrates the tire vulcanization container in the state which the sector mold of FIG. 1 was moved to a temporarily closed mold position. It is a left half vertical cross-sectional view which illustrates the tire vulcanization container in the closed state by moving the sector mold of FIG. 3 to a closed mold position.

Hereinafter, the tire vulcanization container of the present invention will be described based on the embodiment shown in the figure.

As illustrated in FIGS. 1 and 2, a sectional type tire mold is installed in the tire vulcanization container 1 (hereinafter referred to as container 1) of the present invention. This tire mold includes a plurality of sector molds 11 (for example, about 8) arranged in an annular shape to form a tire tread, an annular upper side mold 12a for forming a tire sidewall, and a lower side mold 12b. .. The alternate long and short dash line CL in the figure indicates the annular center line of the sector mold 11 arranged in an annular shape. Green tires are placed in the tire mold. Green tires are not omitted in the drawings of the present application.

This container 1 is installed in a vulcanizer, and a central mechanism 8 is arranged inside. The upper and lower edges of the tubular vulcanization bladder 9 are held by the holding plates 10 and 10 attached to the central mechanism 8 at intervals.

The container 1 includes a segment 3 attached to the outer peripheral surface of each sector mold 11, an elevating plate 4 to which the upper side mold 12a is attached, a bottom plate 5 to which the lower side mold 12b is attached, and a container ring 2 that moves up and down. And a segment moving unit 6. The elevating plate 4, the bottom plate 5, and the container ring 2 serve as heat sources to heat the tire mold.

The elevating plate 4 and the container ring 2 move up and down independently and separately by a hydraulic cylinder or the like. Each segment 3 has an outer peripheral inclined surface that extends downward and is inclined toward the outer peripheral side. Further, the container ring 2 has an inner peripheral inclined surface that extends downward and is inclined toward the outer peripheral side.

Each segment 3 is always placed on the bottom plate 5. These segments 3 move forward and backward with respect to the annular center line CL on the bottom plate 5 by the segment moving portion 6. The segment moving unit 6 includes a moving cylinder 6a that moves up and down, and a plurality of arms 6b and 6c that form a link mechanism connected between the moving cylinder 6a and each of the segments 3.

To elaborate on the segment moving portion 6, the arm 6b rotatably connected to the moving cylinder 6a is rotatably connected to the fixed shaft 6d fixed to the bottom plate 5. Further, another arm 6c rotatably connected to the fixed shaft 6d is detachably and rotatably connected to the outer peripheral surface of the segment 3. As the moving cylinder 6a moves up and down, one arm 6b rotates around the fixed shaft 6d, and the other arm 6c rotates about the fixed shaft 6 in conjunction with this rotation. ing. When the other arm 6c rotates about the fixed shaft 6, the segment 3 moves back and forth with respect to the annular center line CL. As described above, the segment moving portion 6 has a relatively simple structure, and is provided for each of the segments 3.

In this embodiment, the moving cylinder 6a is housed in a buried space 7 formed in the bottom plate 5. Therefore, the same number of buried spaces 7 as the segment 3 is provided in the bottom plate 5. By providing the buried space 7 in this way and accommodating the moving cylinder 6a, the container 1 can be easily made compact.

One arm 6b is also housed in the burial space 7, and the other arm 6c projects upward from the burial space 7. One moving cylinder 6a may be provided below the central mechanism 8, and the arm 6b corresponding to each segment 3 may be rotatably connected to the one moving cylinder 6a. With this configuration, each segment 3 (sector mold 11) can be easily moved in synchronization.

The outer peripheral inclined surface of each segment 3 is slidable on the inner peripheral inclined surface of the container ring 2. The inner peripheral inclined surface of the container ring 2 that moves downward presses the outer peripheral inclined surface of each segment 3, so that each sector mold 11 moves forward with respect to the annular center line CL together with the segment 3. There is.

Hereinafter, the process of closing the open tire mold and vulcanizing the green tire will be described.

To vulcanize the green tire, the container ring 2 and the elevating plate 4 are made to stand by in the upper standby position as illustrated in FIGS. 1 and 2, and the respective sector molds 11 are made to stand by in the open mold position. deep. Further, the upper holding plate 10 is kept on standby at the upper standby position, and the vulcanization bladder 9 is contracted. With the tire mold opened in this way, the green tire is set horizontally on the lower side mold 12b.

Next, as illustrated in FIG. 3, the moving cylinder 6a is moved downward, and each segment 3 is advanced with respect to the annular center line CL by the link mechanism of the segment moving portion 6. As a result, each sector mold 11 is moved from the open mold position to the temporarily closed mold position. The distance from the open mold position to the temporarily closed mold position is, for example, about 85% to 95% of the distance from the open mold position to the closed mold position.

Further, the elevating plate 4 is moved downward to a predetermined position and brought into contact with the upper surface of each of the segments 3 moved to the temporarily closed type position. As a result, each segment 3 is sandwiched between the upper and lower parts of the elevating plate 4 and the bottom plate 5. In this state, the green tire is generally surrounded by the respective segments 3, the upper side mold 12a and the lower side mold 12b.

Next, the container ring 2 is moved downward as illustrated in FIG. As a result, the outer peripheral inclined surface of each segment 3 is pressed by the inner peripheral inclined surface of the container ring 2. Along with this, each segment 3 is further advanced with respect to the annular center line CL, and each sector mold 11 is moved from the temporarily closed mold position to the closed mold position. Each segment 3 moved to the closed position is assembled in a ring shape. The green tire is completely surrounded by the respective segments 3, the upper side mold 12a and the lower side mold 12b, and the tire mold is closed and compacted.

Next, the green tire is pressed from the inside by the vulcanizing bladder 9 expanded in the molded tire mold and vulcanized for a predetermined time under the conditions of a predetermined temperature and a predetermined pressure. Then, the tire mold is opened and the vulcanized tire is taken out. The procedure for opening the tire mold may be the reverse of the procedure for closing the mold.

According to the above-mentioned invention, each segment 3 is always placed on the bottom plate 5 which is a heat source. Therefore, even if the tire mold is open, heat is supplied from the bottom plate 5 to each sector mold 11 through each segment 3. As a result, the heat energy from the bottom plate 5 can be effectively used for heating the sector mold 11 without waste.

By moving each segment 3 using the segment moving portion 6, each sector mold 11 is moved from the open mold position to the temporarily closed mold position. As a result, the container rings 2 come into contact with the respective segments 3 and slide with each other only when the sector mold 11 moves between the temporarily closed mold position and the closed mold position.

Further, the sector mold 11 is in the temporarily closed position when the sector mold 11 slides in contact with the elevating plate 4 and the bottom plate 5 in a state where each segment 3 is sandwiched between the elevating plate 4 and the bottom plate 5 above and below. Only when moving between closed positions.

In this way, the opportunity for each segment 3 to slide with the container ring 2, the elevating plate 4, and the bottom plate 5 is limited to extremely few opportunities as compared with the conventional case. Along with this, it is very advantageous to reduce the wear of the segment 3, the container ring 2, the elevating plate 4, and the bottom plate 5 as compared with the conventional case. As a result, the service life of these components can be extended.

In addition, the molded tire mold is less likely to be displaced due to wear or deformation of the segment 3. Along with this, it is possible to obtain a tire having excellent quality without steps or burrs due to the displacement of the tire mold.

Further, in the present invention, the segment 3 and the sector mold 11 are always placed on the bottom plate 5. Therefore, it is also advantageous to reduce the energy for moving the elevating plate 4 up and down as compared with the case where the heavy segment 3 and the sector mold 11 are suspended on the elevating plate 4.

1 Tire vulcanization container 2 Container ring 3 Segment 4 Lifting plate 5 Bottom plate 6 Segment moving part 6a Moving cylinder 6b, 6c Arm 6d Fixed shaft 7 Buried space 8 Central mechanism 9 Vulcanization bladder 10 Holding plate 11 Sector mold 12a Upper side mold 12b Lower side mold CL Sector mold annular center line

Claims (3)

It is provided with a segment attached to the outer peripheral surface of each of a plurality of sector molds arranged in a ring shape, an elevating plate to which an upper side mold is attached, a bottom plate to which a lower side mold is attached, and a container ring that moves up and down.
By pressing the outer peripheral inclined surface of each of the segments sandwiched between the elevating plate and the upper and lower sides of the bottom plate by the inner peripheral inclined surface of the container ring that moves downward, each of the sector molds can be pressed. In a tire vulcanization container in which the sector molds are assembled in a ring shape to close the tire mold by advancing it with respect to the annular center line and moving it to a closed mold position.
Each of the segments is always placed on the bottom plate, and the segment moving portion is formed on the bottom plate with a segment moving portion for moving the segments forward and backward with respect to the annular center line. The link mechanism is provided with a moving cylinder housed in the buried space and moving up and down, and a link mechanism connected between the moving cylinder and the outer peripheral surface of each of the segments. It has an arm that is detachably and rotatably connected to the outer peripheral surface of the segment, and an arm that is arranged between the arm and the moving cylinder and rotatably connected to the moving cylinder. By advancing each of the segments with respect to the annular center line via the link mechanism as the moving cylinder moves up and down , each of the sector molds is moved to the temporarily closed mold position, and the respective said. The segments are sandwiched between the elevating plate and the bottom plate, and the outer peripheral inclined surface of each of the segments in this state is pressed by the inner peripheral inclined surface of the container ring that moves downward. A container for smelting tires, characterized in that the sector mold is configured to move to the closed position. The tire vulcanization container according to claim 1, wherein only one moving cylinder is provided . The tire vulcanization container according to claim 1, wherein the buried space is formed in the same number as the segments .

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