JP2001047439A - Method for vulcanizing tire and tire vulcanizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve productivity and quality while shortening a cycle time of vulcanizing a tire. SOLUTION: The vulcanizer preliminarily vulcanizes a green tire 6 out of a bladderless tire vulcanizing press 3 by using the press 3, preheating the tire 6, and vulcanizing and molding (primarily vulcanizing) the overall tire 7 preliminarily vulcanized by the press 3. Thus, a time for restraining the tire by the press 3 can be shortened, and a cycle time of vulcanizing and molding the tire can be shortened, thereby improving productivity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire vulcanizing method and a tire vulcanizer for vulcanizing a green tire by using a bladderless tire vulcanizing press.

[0002]

2. Description of the Related Art To vulcanize a green tire by a bladderless tire vulcanizing press, the upper and lower bead portions of the green tire are respectively gripped and the tire is molded (die).
And the heating medium (heating gas,
By supplying steam or the like, vulcanization molding is performed by the deterioration of rubber due to heating.

[0003]

However, as shown in the cross section in FIG. 17, the green tire is uneven in thickness, and the thickness of the green tire is reduced in order to prevent the occurrence of unvulcanized tires in a tire vulcanizing press. The vulcanization time is set based on the temperature rise of the tread portion R and the bead portion V of the meat portion. Therefore, even if the inside of the sidewall portion S, which is a thin portion of the green tire, reaches the vulcanization temperature, the vulcanization molding state is maintained until the inside of the tread portion R or the bead portion V of the thick portion reaches the vulcanization temperature. In this case, the production cost is increased due to the loss of heat energy during that period, and the cycle time of tire vulcanization is also increased, thereby reducing productivity.
The inner circumference of the green tire is reinforced by an inner liner portion L as shown in FIG. This inner liner portion L is usually attached to the inner periphery of the green tire such that the ends are overlapped, and functions as a bladder for adjusting the shape of the green tire when vulcanizing by a bladderless tire vulcanizing press. Is what you do. Therefore, the heating medium (heating gas, heating gas,
When steam or the like is directly applied to the inner liner portion L, the heating medium may enter the inner liner portion L from the seam or flaw, and the heating pressure medium acting on the inner liner portion L may be static. Because of the pressure, vulcanization molding is performed with seams and scratches left as they are, which greatly affects the quality and appearance of tire vulcanization.

An object of the present invention is to improve productivity and quality while shortening the cycle time of tire vulcanization.

[0005]

In the tire vulcanizing method and the tire vulcanizer of the present invention, a green tire is vulcanized and molded using a bladderless tire vulcanizing press.
The green tire was pre-cured outside the tire vulcanizing press, and then the entire tire pre-heated by the tire vulcanizing press was vulcanized. Since the tire preheated by the tire vulcanizing press is vulcanized and molded, the time for restraining the tire by the tire vulcanizing press is reduced. Also, if the green tire is pre-cured at the same time as the pre-heating, the time required for restraining the tire with the tire vulcanizing press can be further shortened. Time can be shortened. Also, instead of performing all vulcanization of the green tire with a tire vulcanizing press, pre-heating of the green tire and vulcanization of the pre-heated tire are performed separately so that vulcanization can be performed in parallel. Since the process can be performed, the cycle time of tire vulcanization can be shortened in total.

In the preliminary step, if the inner liner portion on the inner periphery of the green tire is subjected to preliminary vulcanization, irregularities such as seams and defects in the inner liner portion can be smoothed (uniform) and repaired. When the low-pressure heating gas is applied to the inner liner while increasing the pressure, vulcanization does not proceed to the inner layer of the tire, and the rubber can have fluidity only on the surface of the inner liner. Can be vulcanized.

In the preliminary step, when the thick portion of the tread portion or the bead portion of the green tire is preheated, the time for heating the thick portion to the vulcanization temperature by the tire vulcanizing press can be reduced. In particular, when heated to a temperature immediately before the start of vulcanization, the vulcanization molding can be immediately shifted to the tire vulcanizing press.

[0008] If the pre-treating means is also used for conveying green tires and pre-vulcanized tires in addition to pre-vulcanization and pre-heating, the tire vulcanizer can be downsized.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A tire vulcanizing method and a tire vulcanizing machine according to the present invention will be described.

According to the present invention, a green tire is precured and preheated outside a tire vulcanizing press using a bladderless tire vulcanizing press, and precured with a tire vulcanizing press. The entire tire was subjected to vulcanization molding (main vulcanization). As a result, the time required for restraining the tire by the tire vulcanizing press can be shortened, the cycle time of tire vulcanization molding can be shortened, and the productivity can be improved.

Hereinafter, a tire vulcanizer according to an embodiment of the present invention will be described, and then a tire vulcanizing method will be described.

1 and 2, a tire vulcanizer 1
Is a pre-vulcanizing unit 2 (pre-processing means) for pre-vulcanizing and pre-heating the green tire 6;
Preheated tire 7 (hereinafter, “precured tire 7”)
). A bladderless tire vulcanizing press 3 for performing vulcanization molding (main vulcanization) on the whole, and two transport loaders 4 and 5 (inner grip chuck loader 4 and outer grip chuck loader 5) for transporting green tires 6 and the like. ).

The pre-vulcanizing unit 2 is arranged in front of a bladderless tire vulcanizing press 3 and is arranged in parallel with the green tire 6.
Is subjected to preliminary vulcanization and preliminary heating. As an example of the preliminary vulcanizing unit 2, as shown in FIG. 3, two upper and lower tire chucks 12 and 13 for respectively holding upper and lower bead portions V of the green tire 6, and a heater 14 for heating the outer periphery of the green tire 6 And a heat supply source 15 for supplying a heating medium (heating gas) into the green tire 6.

The upper tire chuck 12 is provided at the tip of the revolving arm 46 of the transport loader 4 and is also used for transporting the tire 6 (7). The lower tire chuck 13 faces the upper tire chuck 14 on the unit base 16. It is provided in. Each of the tire chucks 12 and 13 has three or more claws 17 that simultaneously expand and contract in the radial direction, and inserts each of the claws 17 in the reduced diameter state into the green tire 6 to expand the diameter. The inside of the green tire 6 is sealed by gripping the portion V between the upper and lower rims 18. The green tire 6 and the like are released by reducing the diameter of each of the claws 17 again.

The heater 14 (infrared heater, ceramics heater, etc.) is disposed on the inner periphery of the heat insulating container 19 for housing the green tire 6, and the tread starts from the outer periphery of the green tire 6 housed in the heat insulating container 19. The part R and the upper and lower bead parts V (thick part) are heated. The heat insulating container 19 is provided on the lower tire chuck 13 (unit base 16),
It extends to the upper tire chuck 12 so as to cover the green tire 6. The upper end of the heat insulating container 19 is the green tire 6.
Open for storage. The heat supply source 15 supplies a heating gas into the sealed green tire 6 from the lower tire chuck 13 side through a supply pipe 20, and the heating gas supplied into the tire 6 is discharged from the lower tire chuck 13 side. It is discharged through a pipe 21 (see FIG. 3). still,
As the heating gas into the green tire 6, a heating medium (heating gas) discharged from the tire vulcanizing press 3 may be supplied from the supply pipe 20. (Recycle use), it is possible to use heat efficiently and to save energy.

In this configuration, the pre-vulcanizing unit 2 holds the green tire 6 in a heat-insulating container 19 in a sealed manner, and then supplies a heating gas into the tire 6 while providing a tread portion R and an upper and lower bead portion V of the tire 6. By heating the (thick portion), the inner liner portion L on the inner periphery of the green tire 6 is pre-vulcanized, and the thick portion such as the tread portion R is pre-heated (see FIG. 3).

The bladderless tire vulcanizing press 3 (hereinafter referred to as "tire vulcanizing press 3") is one in which the entire pre-vulcanized tire 7 is subjected to vulcanization molding (main vulcanization). As shown in FIG. 4, the tire vulcanizing press 3 includes upper and lower split molds 25 and 26 for vulcanizing the pre-vulcanized tire 7 and upper and lower bead portions V of the pre-vulcanized tire 7. It consists of two upper and lower central mechanisms 27 and 28 which are respectively gripped.
Each of the molds 25 and 26 is openable and closable, and is previously heated by steam or the like before vulcanization molding. The upper mold 25 is provided on a vertically movable upper platen 29, and the lower mold 26 is provided on a lower platen 30 fixed to the vulcanizer frame 3A (see FIG. 2).

The upper center mechanism 27 includes an upper platen 29
It is provided on the side so as to be able to move up and down. At the lower end of the upper center mechanism 27, an upper bead ring 31 and an upper bead sector 32 for holding the upper bead V of the pre-vulcanized tire 7 between the upper bead ring 31 are provided. The lower center mechanism 28 is provided on the lower platen 30 side so as to be able to move up and down. At the upper end of the lower center mechanism 28, a lower bead ring 33 and a lower bead sector 34 for holding the lower bead V of the pre-vulcanized tire 7 between the lower bead ring 33 are provided. Each bead sector 32, 34
Is adapted to expand and contract with the movement of the center mechanisms 27 and 28.

In this configuration, the tire vulcanizing press 3 holds the upper and lower bead portions V of the pre-vulcanized tire 7 with the upper and lower central mechanisms 27 and 28, seals the inside of the tire 7, and then closes each central mechanism. By supplying a high-pressure heating medium (heating gas, steam, etc.) from each supply pipe 35 of 27, 28, the pre-vulcanized tire 7 is pressed against each of the closed molds 25, 26 to form a product shape, Vulcanization (main vulcanization) is performed due to deterioration of the rubber by heating (see FIG. 9). The vulcanization of the pre-vulcanized tire 7 is not limited to the one that supplies a heating medium, and the vulcanization may be performed by pressing the heated inner mold from the inside toward the inner periphery of the green tire 6. Further, the tire 8 vulcanized and formed by the tire vulcanizing press 3 (hereinafter referred to as “vulcanized molded tire 8”) is carried out to the carry-out conveyor 11 by turning and lifting / lowering the unloader 9 for carrying out. And is sent to the next process such as a post cure inflator. The unloader 9 is provided on a guide column 36 arranged in parallel behind the tire vulcanizing press 3 so as to be pivotable and vertically movable.
And a tire chuck 38 similar to the above.

Transport loader 4 (inner grip chuck loader)
Is provided on a guide column 45 arranged side by side in the preliminary vulcanizing unit 2 so as to be able to move up and down and pivot freely. This transport loader 4
The upper arm chuck 12 of the pre-vulcanizing unit 2 is provided at the tip of the swivel arm 46 to transport the green tire 6 and the like.
The green tire 6 is also used for pre-vulcanization or the like. With this configuration, the transport loader 4 grips the green tire 6 fed by the carry-in conveyor 10 from the inside,
Conveyed to pre-vulcanization unit 2 and pre-vulcanization unit 2
To the tire vulcanizing press 3.

The transport loader 5 (external gripper chuck loader) is rotatably provided on a column 47 between the preliminary vulcanizing unit 2 and the tire vulcanizing press 3. The transport loader 5 has a tire chuck 49 at the tip of the turning arm 48. The tire chuck 49 has three or more claws 50 that simultaneously expand and contract in the radial direction. The pre-vulcanized tire 7 is transferred between the claws 50 in the expanded state to reduce the diameter. Then, the outer periphery of the tire 7 is gripped from the outside. Further, the diameter of each of the claws 50 is expanded again to release the pre-vulcanized tire 7.
With this configuration, the transport loader 5 grips the pre-vulcanized tire 7 gripped from the inside by the transport loader 4 from the outside, and carries it between the molds in the open state of the tire vulcanizing press 3.

Next, a tire vulcanizing method in the tire vulcanizer 1 will be described.

To vulcanize and mold the green tire 6, the pre-vulcanization unit 2 preliminarily vulcanizes and preheats the green tire 6, and then the pre-vulcanizing press 3 including the unvulcanized portion. Vulcanization molding (final vulcanization) for the entire vulcanized tire 7
Is performed.

In the pre-vulcanization and pre-heating in the pre-vulcanization unit 2, the upper bead V of the green tire 6 on the carry-in conveyor 10 is gripped from the inside by the upper tire chuck 12 of the transport loader 4, and the pre-vulcanization unit 2 and stored in the heat insulating container 19 (see FIGS. 5A and 5B).

Subsequently, the lower bead portion V of the green tire 6 is gripped from the inside by the lower tire chuck 13 of the pre-vulcanizing unit 2, the inside of the tire 6 is sealed, and the green tire 6 is supplied by supplying a heating gas. Preliminary vulcanization is performed by directly acting on the inner liner portion L on the inner periphery. In parallel with the preliminary vulcanization, the heater 14 preheats the thick portion such as the tread portion R and the upper and lower bead portions V from the outer periphery of the green tire 6 (see FIG. 5C).

The pre-vulcanization conditions in the pre-vulcanization unit 2 are determined by the relative relationship between the degree of vulcanization of the green tire 6 (the inner liner portion L), the vulcanization temperature, the vulcanization time and the like. Incidentally, the pre-vulcanization conditions are appropriately changed depending on the tire size and the like. Green tire 6 (Inner liner L)
The degree of vulcanization is such that irregularities (see FIG. 17) such as joints and defects in the inner liner portion L are smoothed (uniform) and repaired. That is, preliminary vulcanization is carried out to such an extent that the inner liner portion L is smoothened so as to be continuous along the inner periphery of the green tire 6 without any scratches or seams. The vulcanization temperature is a temperature at which vulcanization is promoted. In general, as the vulcanization temperature increases, the temperature of the green tire 6 also rises rapidly, so that the vulcanization reaction due to the deterioration of rubber is accelerated, and the vulcanization time is shortened. The vulcanization time is set to a time at which an optimum vulcanization temperature is selected and pre-vulcanization is performed at this vulcanization temperature until the inner liner portion L is repaired. As a specific example of the pre-vulcanization, for example, a low-pressure heating gas is directly applied to the inner liner portion L to promote vulcanization at 140 to 160 ° C.
Heat within the range. When the low-pressure heating gas is supplied into the sealed green tire 6, the pressure is gradually increased in the low-pressure range. When a low-pressure, relatively high-temperature, and gradually pressurized heating gas is directly applied to the inner liner portion, vulcanization does not proceed to the inner layer of the green tire 6, and the rubber has fluidity only on the surface of the inner liner portion L. As shown in FIG. 6, the inner liner portion L can be continuously formed along the inner circumference of the green tire 6. As described above, when the inner liner portion L is subjected to pre-vulcanization and repaired, the inner liner portion L may have a role similar to that of a bladder in vulcanization molding (main vulcanization) by the tire vulcanizing press 3. it can.

The pre-heating condition in the pre-vulcanizing unit 2 is to heat the tread portion R and the like at a temperature immediately before the start of vulcanization, for example, in the range of 100 to 140 ° C. The heating time is set to a time at which an optimum temperature is selected and the inner layer such as the tread portion R can be preheated at this heating temperature. Note that the preheating condition is appropriately changed depending on the tire size and the like. Further, under the pre-vulcanization condition, the tread portion R of the green tire 6 is heated not only from the outer periphery of the tire 6 but also by the heating gas supplied into the tire 6, so Determined taking into account the temperature.

When the pre-vulcanization and the pre-heating are completed, the transport loader 4 is raised and turned to transport the vulcanized tire 7 onto the transport loader 5. Subsequently, by lowering the transport loader 4, the pre-vulcanized tire 7 is transferred onto the tire chuck 49 of the transport loader 5, and the pre-vulcanized tire 7 is gripped by the tire chuck 49 from the outside. The process is shifted to vulcanization molding (main vulcanization) by the tire vulcanizing press 3. At this time, the temperature of the pre-vulcanized tire 7 decreases due to the atmosphere during the transport of the transport loaders 4 and 5, but transport by the transport loaders 4 and 5 is performed instantaneously, and Since the heat capacity is large, the influence of the temperature drop due to the atmosphere is small, the tread portion R and the like (thick portion) of the pre-vulcanized tire 7 are brought to a state close to the vulcanization start temperature, and the inner liner portion L is set to the vulcanization start temperature In the above state, it can be conveyed to the tire vulcanizing press 3. The transport loader 4 that has transported the pre-vulcanized tire 7 stores the new green tire 6 in the pre-vulcanization unit 2 and shifts to pre-vulcanization and pre-heating, so that the pre-vulcanization unit 2 Pre-vulcanization and the like and vulcanization molding (main vulcanization) of the tire vulcanizing press 3 are performed simultaneously in parallel.

In the vulcanization molding (main vulcanization) by the tire vulcanizing press 3, the transport loader 5 is turned to carry the pre-vulcanized tire 7 between the open molds 25 and 26 (FIG. 7).
(A)]. Subsequently, the upper center mechanism 27 is lowered halfway, and the upper bead portion V of the pre-vulcanized tire 7 is gripped by the upper bead ring 31 and the upper bead sector 32 [FIG.
(See (b)). In this state, the claws 50 of the transport loader 5 are expanded in diameter to release the gripping of the pre-vulcanized tire 7, the upper center mechanism 27 is raised, and the transport loader 5 is retracted from the tire vulcanizing press 3 [FIG. 8 (a)].

Then, the upper center mechanism 27 is lowered again together with the upper mold 25, and the lower bead portion V of the pre-vulcanized tire 7 is held on the lower bead ring 33. As a result, the lower bead portion V of the pre-vulcanized tire 7 expands and rises, and fits into the lower bead ring 33. Next, the lower center mechanism 28 is raised to grip the lower bead portion V. Then, the pre-vulcanized tire 7 is supplied by each supply pipe 35.
A low-pressure gas is supplied into the inside (see FIG. 8B). At this time, the inner liner portion L repaired by the pre-vulcanization expands along the inner periphery of the pre-vulcanized tire 7, and functions as a bladder for adjusting the shape of the pre-vulcanized tire 7.

In this manner, the upper and lower bead portions V of the pre-vulcanized tire 7 are gripped, and when the sealing inside the tire 7 is completed, the upper mold 25 is lowered and the upper and lower molds 25, 2
6 is closed, a high-pressure heating medium (a heating gas or the like) is supplied from each supply pipe 35, and the heating medium is directly applied to the inner liner portion L on the inner periphery of the pre-vulcanized tire 7 to supply the heating medium. The entire tire 7 is vulcanized (see FIG. 9A). At this time, in the pre-vulcanized tire 7, the thick portions (the tread portion R and the upper and lower bead portions V) are pre-heated until immediately before the vulcanization start temperature, and the inner liner portion L is heated to the vulcanization start temperature or higher. Therefore, the temperature is immediately raised to the vulcanization start temperature by the supply of the heating medium, and the process is shifted to vulcanization due to the deterioration of the entire rubber, and the vulcanization molding is completed in a short time. The heating medium supplied into the pre-vulcanized tire 7 acts to expand the inner liner portion L repaired by the pre-vulcanization, so that the pre-vulcanized tire is expanded by the expansion of the inner liner portion L. 7 can be pressed against each of the pre-heated molds 25 and 26, and the tread portion R and each bead portion V can be vulcanized from the tire outer periphery, and the inner liner portion L can have the same role as a bladder. Becomes Further, since the inner liner portion L is continuous along the inner periphery of the pre-vulcanized tire 7 by the repair of the pre-vulcanization, it is possible to prevent the vulcanizing medium from being turned over due to entering the tire 7.

When the vulcanization molding by the tire vulcanizing press 3 is completed, the gripping of the upper bead portion V by the upper center mechanism 27 is released, and the upper mold 25 and the upper center mechanism 27 are raised (see FIG. 9B). ]. Then, the unloader 9 is inserted between the upper and lower molds 25 and 26, and the lower center mechanism 28
And the vulcanized tire 8 is peeled off from the lower mold 26. Subsequently, the upper bead portion V of the vulcanized molded tire 8 is gripped from the inside by the tire chuck 38 of the unloader 9, and the lower bead portion V is released from being gripped by the lower center mechanism 28. The tire 8 is unloaded from the tire vulcanizing press 3 to the unloading conveyor 11 (see FIG. 9C). The vulcanized molded tire 8 carried out of the tire vulcanizing press 3 is carried by the carry-out conveyor 11 to the next step such as a post cure inflator.

Next, the tire vulcanizer 1 and the tire vulcanizing method shown in FIGS. 10 and 11 will be described.

The tire vulcanizer 1 shown in FIGS. 10 and 11 is different from FIGS. 1 and 2 in that the transport loader 5 is not provided.
The difference is that the pre-vulcanized tire 7 is directly conveyed to the tire vulcanizing press 3 by the conveying loader 4. The tire vulcanizing method in the tire vulcanizer 1 will be described. Precuring and preheating of the green tire 6 are performed in the same manner as in FIGS. 1 and 2 (see FIGS. 5 and 6). .

In the vulcanization molding (main vulcanization) by the tire vulcanizing press 3, the pre-vulcanized tire 7 is opened from the pre-vulcanizing unit 2 by turning the transport loader 4 and moving up and down. It is carried in between (see FIG. 12A). Subsequently, the transport loader 4 is lowered, the lower bead portion V of the pre-vulcanized tire 7 is fitted into the lower bead ring 33, and the lower bead portion V is raised by raising the lower center mechanism 28 to lower the lower bead ring 33 and the lower bead sector 34. And grasp with. In this state, the gripping of the upper bead portion V by the transport loader 4 is released, and the transport loader 4 is lifted and turned to withdraw from the tire vulcanizing press 3 (see FIG. 12B). The transport loader 4 that has transported the pre-vulcanized tire 7 stores the new green tire 6 in the pre-vulcanization unit 2 and shifts to pre-vulcanization and pre-heating, so that the pre-vulcanization unit 2 Pre-vulcanization and vulcanization of tire vulcanizing press 3 (main vulcanization)
Are performed simultaneously and in parallel.

Then, the upper center mechanism 27 and the upper mold 25
Is lowered halfway, and the upper bead portion V of the pre-vulcanized tire 7 is brought into contact with the upper bead ring 31, and then the low pressure gas is supplied to the pre-vulcanized tire 7 through each supply pipe 35 [FIG.
(C)). As a result, the upper bead portion V of the pre-vulcanized tire 7 expands and lifts, and the upper bead ring 3
3, the upper bead portion V is gripped by lowering the upper center mechanism 27. At this time, the inner liner portion L repaired by the pre-vulcanization expands along the inner periphery of the pre-vulcanized tire 7, so that the pre-vulcanized tire 7
Functions as a bladder to shape the shape of the.

In this manner, the upper and lower bead portions V of the pre-vulcanized tire 7 are gripped, and when the sealing inside the tire 7 is completed, the pre-vulcanized tire 7 is thereafter operated in the same manner as in FIGS. The whole is vulcanized (see FIG. 9).

A modification of the pre-vulcanization unit 2 for performing pre-vulcanization and pre-heating will be described with reference to FIGS.

The pre-vulcanizing unit 2 shown in FIG. 13 heats the room temperature gas by using the exhaust heat of the heating medium (steam, drain, etc.) discharged from the tire vulcanizing press 3, and supplies this heated gas to the supply pipe. The inner liner portion L is pre-vulcanized by being supplied into the green tire 6 through 20. Since the waste heat of the heating medium discharged from the tire vulcanizing press 3 is used (recycled), efficient heat use is possible, and energy saving can be achieved.

In the pre-vulcanizing unit 2 shown in FIG. 14, a heater 56 (such as an infrared heater or a ceramic heater) and an electric fan 57 are arranged around a support column 55 erected in the center of the lower tire chuck 13. Supply pipe 2
The room temperature gas from 0 is heated in the green tire 6 and agitated by the electric fan 57 to pre-vulcanize the inner liner portion L.

In the tire vulcanizer and the tire vulcanizing method described above, the pre-vulcanization is performed on the inner liner portion L. Preheating may be performed. in this case,
The inner liner portion L is preheated to a temperature immediately before the start of vulcanization by the heating gas from the heat supply source 15.

Further, a description has been given of the case where the inner liner portion L of the green tire 6 is subjected to pre-vulcanization.
By heating to 0 to 160 ° C.), preliminary vulcanization may be performed on portions other than the inner liner portion L, and a configuration as shown in FIG. 15 can be performed. In FIG. 15, a low-pressure gas is supplied from the supply pipe 20 into the green tire 6 to adjust the shape, and a heating gas is supplied from the supply pipe 60 between the outer periphery of the green tire 6 and the heat insulating container 19. Pre-vulcanization is applied to the tread portion R and the like.

Further, the unloading of the vulcanized molded tire 8 is performed as shown in FIG.
A roller conveyor 65 as shown in FIG. FIG.
The roller conveyor 65 of FIG. 6 is horizontally and incliningly tiltable. The roller conveyor 65 is inserted between the vulcanized molded tire 8 in a state of being peeled off from the lower mold 26 and the lower mold 26, and then is inclined to be inclined. From the lower bead ring 33 and transported downward to the transport conveyor 11. After loading the roller conveyor 65, the lower center mechanism 28 is slightly lifted to release the gripping of the vulcanized tire 8 by the lower bead sector 34 and the like. After the vulcanized molded tire 8 is carried out, the roller conveyor 65 is retracted from the tire vulcanizing press 3.

[0044]

According to the present invention, after the green tire is preheated, the tire is vulcanized and molded by the tire vulcanizing press. Also, instead of performing all vulcanization molding of a green tire with a tire vulcanizing press, vulcanization can be performed in parallel by separately performing preheating of the green tire and vulcanization molding of the preheated tire. Since the process can be carried out,
The cycle time of tire vulcanization can be shortened as a whole, thereby improving productivity. Similarly, even if only the pre-vulcanization is applied to the green tire, the time required for restraining the tire by the tire vulcanizing press can also be shortened. Thus, the time for restraining the tire can be reduced.

In the preliminary step, if the inner liner portion on the inner periphery of the green tire is subjected to preliminary vulcanization, seams and defects of the inner liner portion can be smoothed and repaired. The inner liner portion can have a role similar to that of a bladder, and vulcanization molding can be reliably performed by a bladderless tire vulcanizing press.
Further, by providing the inner liner portion with a role similar to that of the bladder, the bladder is not required, and the cost of the material and the molding process can be reduced. Furthermore, when the inner liner portion is pre-vulcanized and repaired, the quality can be improved without the inner liner portion being turned over during vulcanization molding by a tire vulcanizing press.

In the preliminary step, when the thick portion of the tread portion and the bead portion of the green tire is preheated, vulcanization molding is immediately performed by the tire vulcanizing press, and the time required for restraining the tire by the tire vulcanizing press is obtained. Can be further reduced.

If the pre-vulcanizing means is used for conveying green tires and pre-vulcanized tires in addition to pre-vulcanizing and pre-heating, the size of the tire vulcanizer can be reduced.

[Brief description of the drawings]

FIG. 1 is a top view showing the overall configuration of a tire vulcanizer.

FIG. 2 is a side view showing the entire configuration of the tire vulcanizer, as viewed in the direction of arrows AA in FIG.

FIG. 3 is a sectional view showing a configuration of a pre-vulcanizing unit of the tire vulcanizer.

FIG. 4 is a sectional view showing a configuration of a tire vulcanizing press of the tire vulcanizer.

FIG. 5 is a diagram showing a procedure for performing pre-vulcanization and pre-heating on a green tire.

FIG. 6 is a schematic diagram showing a preheated green tire.

FIG. 7 is a diagram showing a procedure for carrying a pre-vulcanized tire into a tire vulcanizing press.

FIG. 8 is a diagram showing a procedure for gripping a pre-vulcanized tire by a tire vulcanizing press.

FIG. 9 is a view showing a procedure for subjecting a pre-vulcanized tire to vulcanization molding and carrying out the vulcanized and molded vulcanized tire from a tire vulcanizing press.

FIG. 10 is a top view showing the overall configuration of a tire vulcanizer as a modification.

FIG. 11 is a side view showing the entire configuration of the tire vulcanizer, as viewed in the direction of arrows BB in FIG. 11;

FIG. 12 is a diagram showing a procedure for carrying a pre-vulcanized tire into a tire vulcanizing press and holding it.

FIG. 13 is a sectional view showing a modification of the pre-vulcanization unit.

FIG. 14 is a sectional view showing a modification of the pre-vulcanization unit.

FIG. 15 is a sectional view showing a modification of the pre-vulcanization unit.

FIG. 16 is a view showing a modified example in which a vulcanized molded tire is carried out to a carry-out conveyor.

FIG. 17 is a schematic view showing a cross section of a green tire.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 tire vulcanizer 2 pre-processing unit (pre-processing means) 3 bladderless tire vulcanizing press 4 transport loader (inner grip chuck loader) 5 transport loader (outer grip chuck loader) 6 green tire 7 pre-vulcanized tire 8 Vulcanized molded tire

Claims (13)

[Claims] 1. A tire vulcanizing method for vulcanizing and molding a green tire using a bladderless tire vulcanizing press, wherein the green tire is heated by heating the green tire outside the tire vulcanizing press. A preliminary step of performing preheating on the tire, and a vulcanization molding step of sealing and gripping the preheated tire with the tire vulcanizing press, and directly heating from the tire inner periphery to perform vulcanization molding on the entire tire; A tire vulcanization method comprising: 2. The tire vulcanizing method according to claim 1, wherein in the preliminary step, the green tire is preliminarily vulcanized. 3. The tire vulcanizing method according to claim 2, wherein in the preliminary step, the inner liner portion on the inner periphery of the green tire is subjected to preliminary vulcanization. 4. The pre-process according to claim 2, wherein a low-pressure heating gas is enclosed in the green tire while increasing the pressure, and the inner liner portion on the inner periphery of the green tire is pre-vulcanized. Tire vulcanization method. 5. The tire vulcanizing method according to claim 1, wherein in the preliminary step, a preheating is performed on a tread portion and a bead portion of the green tire. 6. The tire vulcanizing method according to claim 2, wherein in the preliminary step, a preheating is performed on a tread portion and a bead portion of the green tire. 7. The tire vulcanizing method according to claim 1, wherein the green tire is preheated to a temperature immediately before the start of vulcanization in the preliminary step. 8. A method for vulcanizing a green tire using a bladderless tire vulcanizing press, wherein the green tire is heated by heating the green tire outside the tire vulcanizing press. A pre-vulcanization step of performing pre-vulcanization on the tire, and a vulcanization molding step of sealing and gripping the pre-vulcanized tire with the tire vulcanizing press, and directly heating the tire from its inner periphery to perform vulcanization molding on the entire tire. And a tire vulcanization method comprising: 9. A tire vulcanizer for vulcanizing and forming a green tire, wherein: a pre-processing means for heating the green tire to pre-heat the green tire; A tire vulcanizing machine comprising: a bladderless tire vulcanizing press for sealingly gripping a preheated tire and directly heating from the inner periphery of the tire to perform vulcanization molding on the entire tire. 10. The tire vulcanizer according to claim 9, wherein the pre-processing means performs pre-vulcanization on the green tire. 11. The tire vulcanizer according to claim 10, wherein the pre-processing means heats an inner liner portion of the inner periphery of the green tire to perform pre-vulcanization on the inner liner portion. 12. The pretreatment means according to claim 9, wherein the thick portion of the tread portion and the bead portion is heated from the outer periphery of the green tire, and the thick portion is preheated. The tire vulcanizer according to any one of the above. 13. The preheating means has a function of carrying in the green tire and conveying the prevulcanized tire toward the tire vulcanizing press. A tire vulcanizer according to claim 1.