JP7035768B2 - Bladder assembly for tire vulcanization - Google Patents

Description

The present invention relates to a tire vulcanization bladder assembly, and more specifically, a tire vulcanization capable of efficiently attaching a tire vulcanization bladder assembly to a central mechanism of a tire vulcanizer while having a simple configuration. It is about a bladder assembly for tires.

The tire vulcanizer is equipped with a central mechanism and a tire vulcanizer assembly attached to the central mechanism. This bladder assembly has a tubular tire vulcanizing bladder and a lower ring portion and an upper ring portion. The lower ring portion and the upper ring portion are provided on the peripheral edge portion of the lower end opening and the peripheral edge portion of the upper end opening of the bladder, respectively, and the bladder is attached to the central mechanism via these.

When attaching the bladder assembly to the central mechanism, move it to a position near the central mechanism using a hoist crane or the like. Here, when the bladder assembly is lifted and moved, there is a problem that the upper ring portion shifts with respect to the lower ring portion or becomes unstable. Therefore, it is necessary to take measures such as slowing down the speed of moving the bladder assembly or temporarily fixing the upper ring portion to prevent it from shifting. However, these measures are an obstacle to shortening the work time for attaching the bladder assembly to the central mechanism of the tire vulcanizer. Conventionally, a bladder transfer device has been proposed for the purpose of easily and quickly exchanging a bladder assembly (see Patent Document 1). However, the transport device of this proposal has a problem that a complicated mechanism is required.

Japanese Unexamined Patent Publication No. 6-134765

An object of the present invention is to provide a tire vulcanization bladder assembly capable of efficiently attaching a tire vulcanization bladder assembly to a central mechanism of a tire vulcanization machine while having a simple structure.

In order to achieve the above object, the tire vulcanization bladder assembly of the present invention includes a tubular tire vulcanization bladder, a lower ring portion that sandwiches the peripheral edge of the lower end opening of the bladder, and an upper end opening of the bladder. In a tire vulcanizing bladder assembly that is provided with an upper ring portion that sandwiches the peripheral portion of the tire and is attached to the central mechanism of the tire vulcanizer via the lower ring portion and the upper ring portion, the lower ring portion is provided. In a state where the upper ring portion is placed on the lower ring portion on the facing surface of the portion and the upper ring portion, the lower ring portion and the upper ring portion move relative to each other in at least a non-circumferential direction in a plan view. The upper ring portion is placed on the lower ring portion by a single unit of the vulcanization bladder assembly before being attached to the tire vulcanizer. The engaging portions formed on the lower ring portion and the upper ring portion engage with each other to restrict relative movement between the lower ring portion and the upper ring portion in at least a non-circumferential direction in a plan view. During vulcanization, the vulcanizing bladder assembly is attached to the tire vulcanizer to inflate the vulcanizing bladder to vulcanize the green tire, and the engaging portions are not engaged with each other. It is characterized by being in an engaged state .

According to the present invention, the engaging portion is formed on the facing surface of the lower ring portion and the upper ring portion. Therefore, although it has a simple structure in which the engaging portion is provided, when the upper ring portion is placed on the lower ring portion, the engaging portions are engaged with each other to form a plan view with the lower ring portion. Relative movement with the upper ring portion at least in the non-circumferential direction is restricted. Along with this, the upper ring portion can be easily maintained in a stable and stable state on the lower ring portion. Since the bladder assembly can be moved in this stable state and mounted on the central mechanism of the tire vulcanizer, the mounting work can be performed efficiently.

It is explanatory drawing which illustrates the bladder assembly of this invention in a vertical cross-sectional view. It is explanatory drawing which illustrates the bladder assembly of FIG. 1 in a plan view. It is explanatory drawing which illustrates the lower ring part of FIG. 1 in a plan view. It is explanatory drawing which shows the deformation example of the lower ring part of FIG. 3 in a plan view. It is explanatory drawing which illustrates the left half of the bladder assembly in the state which the upper ring part of FIG. 1 is placed on the lower ring part, and the engaging part are engaged with each other in the vertical cross-sectional view. FIG. 5 is an explanatory view illustrating a state in which the lower ring portion of FIG. 5 is attached to the central mechanism in a vertical cross-sectional view of the left half. It is explanatory drawing which illustrates the state in which the central post is inserted through the upper ring part of FIG. 6 in the vertical cross-sectional view. It is explanatory drawing which illustrates the state which the green tire is vulcanized by the tire vulcanizer equipped with the bladder assembly of FIG. 1 in the vertical sectional view of the left half. It is explanatory drawing which shows the deformation example of the engaging part in the plan view of the lower ring part. It is explanatory drawing which enlarges and exemplifies the engaging part of FIG. 9 in the vertical cross-sectional view.

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

An embodiment of the tire vulcanizing bladder assembly 1 (hereinafter referred to as bladder assembly 1) of the present invention exemplified in FIGS. 1 to 3 is a rubber tire vulcanizing bladder 2 (hereinafter referred to as bladder 2). A metal lower ring portion 4 and an upper ring portion 5 are provided. The lower ring portion 4 has an annular inner ring member 4A, an annular outer ring member 4B, and a fixing bolt 7 connecting the inner ring member 4A and the outer ring member 4B. The upper ring portion 5 has an annular inner ring member 5A, an annular outer ring member 5B, and a fixing bolt 7 connecting the inner ring member 5A and the outer ring member 5B.

The bladder assembly 1 further has engaging portions 6 (6a, 6c) that engage with each other on facing surfaces of the lower ring portion 4 and the upper ring portion 5. The alternate long and short dash line CL in the figure indicates the center position of the lower ring portion 4 and the upper ring portion 5. The alternate long and short dash line CL of FIGS. 6 to 8 indicates the center position of the lower ring portion 4 and the upper ring portion 5, and the center position (axis center) of the center mechanism 9 (center post 10).

The bladder 2 is a cylindrical body, and the annular peripheral edge portion 3a of the lower end opening in the cylindrical axial direction of the tubular portion 3 and the annular peripheral edge portion 3b of the upper end opening are each with respect to the wall thickness of the tubular portion 3. It is relatively thick. In order to attach the bladder assembly 1 to the tire vulcanizer 8 (central mechanism 9) described later, a lower ring portion 4 and an upper ring portion 5 are attached to the peripheral edge portion 3a and the peripheral edge portion 3b, respectively.

The inner ring member 4A constituting the lower ring portion 4 has a cylindrical mounting hole 4c extending downward, and the portion extending downward thereof is inserted through the outer ring member 4B. A screw thread is provided on the inner peripheral surface of the mounting hole 4c. The inner ring member 4A and the outer ring member 4B are integrated by a fixing bolt 7 with a peripheral edge portion 3a sandwiched between them. A plurality of fixing bolts 7 are arranged at intervals in the circumferential direction about the center position of the mounting hole 4c.

The inner ring member 5A constituting the upper ring portion 5 has a cylindrical through hole 5c in the central portion, and the portion having the through hole 5c is in a state of being inserted into the outer ring member 5B. The inner ring member 5A and the outer ring member 5B are integrated by a fixing bolt 7 with a peripheral edge portion 3b sandwiched between them. A plurality of fixing bolts 7 are arranged at intervals in the circumferential direction about the center position of the through hole 5c.

In this embodiment, the engaging convex portion 6a and the engaging concave portion 6c are provided as the engaging portion 6. The engaging convex portion 6a is formed on the upper surface of the inner ring member 4A, and the engaging concave portion 6c is formed on the lower surface of the inner ring member 5A. As illustrated in FIG. 3, the engaging convex portion 6a is formed in an annular shape around the center position of the mounting hole 4c. Further, in this embodiment, the lower surface of the inner ring member 5A is a slope inclined upward from the outer peripheral side toward the inner peripheral side (through hole 5c), and this slope itself is an engaging recess 6c. ..

The engaging convex portion 6a can adopt not only an annular shape continuous in the circumferential direction but also various specifications (shapes). For example, as shown in FIG. 4, a plurality of engaging convex portions 6a may be provided at intervals in the circumferential direction. It is preferable that the engaging protrusions 6a are scattered at three or more places (for example, 3 to 8 places) in the circumferential direction and arranged at equal intervals in the circumferential direction. Further, the engaging recess 6c not only uses the lower surface (slope) of the inner ring member 5A as it is, but also positively provides a portion (member) having a concave shape on the lower surface of the inner ring member 5A, and this portion (member). Can also be an engaging recess 6c.

In the bladder assembly 1 before being attached to the tire vulcanizer 8, the upper ring portion 5 is placed on the lower ring portion 4 and stored as illustrated in FIG. In this storage state, the engaging convex portion 6a of the lower ring portion 4 and the engaging concave portion 6c of the upper ring portion 5 are engaged, and the bladder 2 projects to the outer peripheral side of the lower ring portion 4 and the upper ring portion 5. ing. By engaging the engaging convex portion 6a and the engaging concave portion 6c, the lower ring portion 4 and the upper ring portion 5 do not relatively shift from front to back and from side to side. The upper ring portion 5 can move upward with respect to the lower ring portion 4, but the movement in the plane direction is restricted.

In this embodiment, even if the engaging convex portion 6a and the engaging concave portion 6c are engaged, the upper ring portion 5 is centered on the center position of the through hole 5c (mounting hole 4c) with respect to the lower ring portion 4. It is possible to move in the circumferential direction. That is, the upper ring portion 5 is only restricted from moving in the non-circumferential direction in a plan view. However, since the upper ring portion 5 and the lower ring portion 4 are connected by the bladder 2, the movement of the upper ring portion 5 in the circumferential direction is regulated by the rigidity of the bladder 2. Therefore, the upper ring portion 5 is substantially freely movable only upward with respect to the lower ring portion 4, and movement in other directions is restricted.

Therefore, by engaging the engaging convex portion 6a and the engaging concave portion 6c, the upper ring portion 5 is maintained in a stable and stable state with respect to the lower ring portion 4. The center positions of the mounting holes 4c and the through holes 5c coincide with each other, and the lower ring portion 4 and the upper ring portion 5 are aligned with each other.

The procedure for attaching the stored bladder assembly 1 illustrated in FIG. 5 to the tire vulcanizer 8 is as follows.

First, as illustrated in FIG. 6, the bladder assembly 1 is moved to the vicinity of the central mechanism 9 of the tire vulcanizer 8 by using a crane, a forklift, or the like while keeping the bladder assembly 1 in the stored state. At the time of this movement, the suspension wire is connected to the lower ring portion 4 (outer ring member 4B) or the intervening stand, or the lower ring portion 4 (outer ring member 4B) or the intervening stand. Support the underside of the forklift with the claws of the forklift.

Subsequently, using a crane, a forklift, or the like, the mounting hole 4c of the lower ring portion 4 is positioned (aligned) with the center mounting portion 10a of the central mechanism 9. After that, by rotating the bladder assembly 1 around the center position of the mounting hole 4c (the axis of the center post 10), the screw portion of the inner ring member 4A and the screw portion of the center mounting portion 10a are screwed together. .. As a result, the inner ring member 4A is fixed to the center mounting portion 10a. At this time, since the mounting hole 4c and the through hole 5c are aligned with each other, the center post 10 and the through hole 5c are aligned with each other.

Therefore, as illustrated in FIG. 7, the central post 10 is moved upward as it is and inserted into the through hole 5c. Next, by fixing the center post 10 and the upper ring portion 5 (inner ring member 5A) with a predetermined fixture, the attachment of the bladder assembly 1 to the tire vulcanizer 8 is completed.

In the work process of attaching the bladder assembly 1 to the tire vulcanizer 8, the upper ring portion 5 is placed on the lower ring portion 4 to engage the engaging convex portion 6a and the engaging concave portion 6c. In plan view, the relative movement of the lower ring portion 4 and the upper ring portion 5 in the non-circumferential direction is restricted. Along with this, the upper ring portion 5 is maintained in a stable and stable state of being placed on the lower ring portion 4. Since the bladder assembly 1 can be moved and attached to the central mechanism 9 in such a stable state, the attachment work can be performed efficiently.

More specifically, since the bladder assembly 1 is stable, it is not necessary to particularly slow down the moving speed, and quick movement is possible. Further, in the bladder assembly 1 in a stable state, misalignment between the lower ring portion 4 (mounting hole 4c) and the upper ring portion 5 (through hole 5c) is suppressed. Therefore, the difficulty of the work of aligning the mounting hole 4c with respect to the center mounting portion 10a and aligning the through hole 5c with respect to the center post 10 is reduced. Therefore, the bladder assembly 1 can be efficiently attached to the central mechanism 9 even though the engaging portion 6 is provided on the facing surfaces of the lower ring portion 4 and the upper ring portion 5. ing.

As illustrated in FIG. 8, the vulcanization mold 11 is attached to the tire vulcanizer 8 equipped with the bladder assembly 1. In this embodiment, the vulcanization mold 11 is composed of an annular upper side mold 12a and a lower side mold 12b, and a plurality of sector molds 13 arranged in an annular shape.

The vulcanization mold 11 on which the green tire G is arranged is closed, and a medium M such as steam or nitrogen gas is injected into the bladder 2 from the injection port 10b formed in the central post 10. As a result, the green tire G is manufactured by pressurizing and heating between the expanded bladder 2 and the vulcanizing mold 11 to produce a vulcanized tire. When the bladder assembly 1 is removed from the tire vulcanizer 8 for replacement, maintenance, or the like, the procedure reverse to the above-mentioned mounting work step may be performed. Therefore, the work of removing the bladder assembly 1 can also be performed efficiently. That is, by using this bladder assembly 1, the bladder assembly 1 can be efficiently attached to and detached from the central mechanism 9.

The engaging convex portion 6a and the engaging concave portion 6c that engage with each other may be provided on either the lower ring portion 4 (inner ring member 4A) or the upper ring portion 5 (inner ring member 5A). That is, the engaging convex portion 6a may be provided on the upper ring portion 5, and the engaging concave portion 6c may be provided on the lower ring portion 4. Alternatively, the engaging convex portion 6a may be provided in the lower ring portion 4 and the upper ring portion 5, and the engaging concave portion 6c may be provided in the lower ring portion 4 and the upper ring portion 5.

The engaging portion 6 is not limited to the specifications (shape) exemplified in the above-described embodiment, but engages with each other to allow relative movement of the lower ring portion 4 and the upper ring portion 5 at least in the non-circumferential direction in a plan view. If it can be regulated, various specifications can be adopted. As illustrated in FIGS. 9 and 10, a plurality of engaging convex portions 6a are formed on the lower ring portion 4 (upper surface of the inner ring member 4A) at intervals in the circumferential direction, and each of them is engaged. An engaging recess 6c is formed between the protrusions 6a. A plurality of engaging convex portions 6b are formed on the upper ring portion 5 (lower surface of the inner ring member 5A) at intervals in the circumferential direction. In FIG. 9, the members of the upper ring portion 5 (inner ring member 5A and the engaging convex portion 6b) are shown by broken lines.

A part of the engaging convex portion 6b is inserted into the engaging concave portion 6c between the engaging convex portions 6a adjacent to each other in the circumferential direction, and the engaging convex portion 6b is the inner circumference of the engaging convex portion 6a. It will be in contact with the surface. As the engaging convex portion 6b engages with the engaging convex portion 6a and the engaging concave portion 6c in this way, the upper ring portion 5 mounted on the lower ring portion 4 has the upper ring portion 5 with respect to the lower ring portion 4. Not only the movement in the non-circumferential direction around the center position of the mounting hole 4c (through hole 5c) is restricted, but also the movement in the circumferential direction is restricted. That is, the engagement of the engaging portion 6 also regulates the relative movement of the lower ring portion 4 and the upper ring portion 5 in the circumferential direction in a plan view, so that the upper ring portion 5 is more stable to the lower ring portion 4. It can be maintained in a state where it is placed without any deviation.

In the present invention, the engaging portion 6 can be integrated with the lower ring portion 4 and the upper ring portion 5 by welding or the like, but at least a part of the engaging portion 6 is formed by the engaging portion 6. It can also be configured to be removable on the surface to be welded. For example, all the engaging convex portions 6a and 6b and the engaging concave portions 6c can be attached to and detached from the lower ring portion 4 and the upper ring portion 5 by using a fixing tool such as a bolt. Alternatively, of the engaging protrusions 6a and 6b and the engaging recesses 6c, only those arranged at desired positions can be detachably attached to and detached from the lower ring portion 4 and the upper ring portion 5 using a fixing tool such as a bolt. do.

By attaching and detaching the engaging portion 6, it becomes possible to easily replace the worn engaging portion 6. Further, it is possible to facilitate a plurality of types of engaging portions 6 having different specifications (shapes), and attach the plurality of types of engaging portions 6 to the bladder assembly 1 for trial use. Depending on the result of this trial, there is also an advantage that the optimum specifications for the bladder assembly 1 can be selected from a plurality of types of engaging portions 6.

1 Bladder assembly 2 Bladder for tire vulcanization 3 Cylindrical part 3a Peripheral part of lower end opening 3b Peripheral part of upper end opening 4 Lower ring part 4A Inner ring member 4B Outer ring member 4c Mounting hole 5 Upper ring part 5A Inner ring member 5B Outer ring member 5c Through hole 6 Engagement part 6a, 6b Engagement convex part 6c Engagement recess 7 Fixing bolt 8 Tire vulcanizer 9 Central mechanism 10 Center post 10a Center mounting part 10b Injection port 11 Vulcanization mold 12a Upper side Side mold 12b Lower side mold 13 Sector mold

Claims (3)

The lower ring is provided with a tubular tire vulcanizing bladder, a lower ring portion that sandwiches the peripheral edge portion of the lower end opening of the bladder, and an upper ring portion that sandwiches the peripheral edge portion of the upper end opening of the bladder. In a tire vulcanizing bladder assembly attached to the central mechanism of a tire vulcanizer via a portion and the upper ring portion.
In a state where the upper ring portion is placed on the lower ring portion on the facing surface of the lower ring portion and the upper ring portion, at least non-circumferential of the lower ring portion and the upper ring portion in a plan view. An engaging part that regulates relative movement in the direction is formed ,
By placing the upper ring portion on the lower ring portion as a single unit of the vulcanization bladder assembly before being attached to the tire vulcanizer, the lower ring portion and the upper ring portion are formed. The engaging portions engaged with each other are engaged with each other, and the relative movement between the lower ring portion and the upper ring portion in a plan view is restricted at least in the non-circumferential direction.
During vulcanization in which the vulcanizing bladder assembly is attached to the tire vulcanizer and the vulcanizing bladder is expanded to vulcanize a green tire, the engaging portions thereof are not engaged with each other. A bladder assembly for tire vulcanization characterized by being in the state of . The bladder assembly for tire vulcanization according to claim 1, wherein the engaging portion regulates relative movement in the circumferential direction between the lower ring portion and the upper ring portion in a plan view. The bladder assembly for tire vulcanization according to claim 1 or 2, wherein the engaging portion is removable from the surface on which the engaging portion is formed.

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