JP6880655B2 - Tire vulcanization system and vulcanization method - Google Patents

Description

The present invention relates to a tire vulcanization system and a vulcanization method, and more specifically, while having a simple structure, different temperature controls are performed on the upper and lower hot plates and side surfaces constituting the vulcanization container. It relates to a tire vulcanization system and a vulcanization method capable of vulcanizing a tire.

When manufacturing a tire, the tire mold in which the green tire is placed is kept in a closed state, and the vulcanized bladder is expanded inside the green tire. The inner surface of the green tire is heated by the expanded vulcanized bladder, and the outer surface of the green tire is heated by the tire mold. The heat required for these heatings is applied, for example, by steam supplied through the supply line (see, for example, Patent Document 1).

The vulcanization container in which the tire mold is installed has an upper and lower hot plates and a side surface portion arranged between the upper and lower hot plates, and a line for supplying steam is connected to each of the upper and lower hot plates. Depending on the tire, the tread portion and the tire side portion of the green tire may be set to different temperatures for vulcanization. For example, when the side surface of a tire is heated at a relatively high temperature, relatively high pressure steam is supplied to the upper and lower hot plates, and relatively low pressure steam is supplied to the side surface of the vulcanization container. To do. That is, a heat source line that supplies relatively high-pressure steam is connected to the supply line connected to the upper and lower hot plates, and a heat source line that supplies relatively low-pressure steam to the supply line connected to the side surface. Need to be connected. Therefore, a plurality of separate heat source lines for supplying steam having different pressures are required, which complicates the equipment.

Japanese Unexamined Patent Publication No. 62-21109

An object of the present invention is a tire vulcanization system capable of vulcanizing a tire while controlling different temperatures for the upper and lower hot plates and side surfaces constituting the vulcanization container, although the structure is simple. And to provide a vulcanization method.

In order to achieve the above object, the tire brewing system of the present invention has a side portion that is arranged between the upper and lower heat plates and the upper and lower heat plates, and the mold is installed inside. Container, a heat plate supply line connected to the upper and lower heat plates, a side surface supply line connected to the side surface, and a heat plate installed in the heat plate supply line. In a tire brewing system having a regulating valve and a side regulating valve installed on the side supply line, the heat plate regulating valve and the side regulating valve are separate from each other. It is a regulating valve, and the heat plate supply line and the side surface portion supply line are separate supply lines that are independent of each other, and the same heat source line to which each of the supply lines is connected and the heat. The supply line having an on-off valve installed on at least one of a plate supply line and the side surface portion supply line, and the on-off valve is installed, is fully opened or fully closed by the on-off valve. The operation of the on-off valve immediately switches between fully open and fully closed only for the supply line, and the operation of the on-off valve and the adjustment for the heat plate adjusting valve and the side surface portion are performed. By adjusting the flow rate of the heat medium by the valve, the heat medium supplied from the heat source line is circulated to the upper and lower heat plates through the heat plate supply line, and also circulates to the side surface portion through the side surface portion supply line. Therefore, the upper and lower heat plates and the side surface portions are configured to be temperature-controlled independently of each other.

In order to achieve the above object, the tire smelting method of the present invention provides a hot plate adjusting valve in the hot plate supply line connected to the upper and lower hot plates constituting the smelting container, and is used for this hot plate. A heat medium is circulated through the upper and lower heat plates through the control valve and the upper and lower heat plates to heat the heat plate, and the side surface portion is arranged between the upper and lower heat plates to form the brewing container. A side surface adjusting valve is provided in the connected side surface supply line, and a heat medium is circulated through the side surface supply line through the side surface adjusting valve to heat the side surface, and the brewing is performed. In the method of smelting a green tire by a tire mold installed inside a container, the heat plate regulating valve and the side surface regulating valve are separate regulating valves that are independent of each other. The heat plate supply line and the side surface supply line, which are independent separate supply lines, are connected to the same heat source line, and are connected to at least one of the heat plate supply line and the side surface supply line. An on-off valve is installed to bring the supply line on which the on-off valve is installed to a fully open or fully closed state by the on-off valve, and the operation of the on-off valve immediately causes the supply line to be fully opened and fully closed. The heat medium supplied from the heat source line is operated by operating the on-off valve and adjusting the flow rate of the heat medium by the heat plate adjusting valve and the side surface adjusting valve in a configuration in which switching is performed. Is circulated to the upper and lower heat plates through the heat plate supply line, and is circulated to the side surface portion through the side surface portion supply line, and the temperature control of the upper and lower heat plates and the side surface portions is independent of each other. It is characterized by doing.

According to the present invention, by installing the on-off valve on at least one of the hot plate supply line and the side surface portion supply line, the supply line on which the on-off valve is installed is fully opened or fully closed by the on-off valve. In this state, the supply line can be immediately switched between fully open and fully closed by operating the on-off valve. Therefore, in the supply line in which the on-off valve is installed, the heat medium in which the supply line is circulated by adjusting the flow rate of the heat medium by the adjusting valve installed in the supply line and operating the on-off valve is used. The flow rate can be adjusted accurately, and the temperature of the heat medium can be controlled accurately accordingly. As a result, even if the heat source line for supplying the heat medium to the heat plate supply line and the side surface portion supply line has only one system, the upper and lower heat is generated through the heat plate supply line. By passing a heat medium through the plate and heating it, and then passing the heat medium through the side surface portion and heating it, different temperature control is performed for the upper and lower heat plates and the side surface portion. The tire can be smelted while doing so.

It is explanatory drawing which illustrates the outline of the vulcanization system of the tire of this invention. It is explanatory drawing which illustrates the inside of the vulcanization container of FIG. 1 in the vertical cross-sectional view. It is explanatory drawing which illustrates the sector, segment and container ring of FIG. 1 in a plan view. It is explanatory drawing which illustrates the outline of another embodiment of the tire vulcanization system of this invention.

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

The tire vulcanization system 1 of the present invention illustrated in FIG. 1 is composed of a vulcanization container 9 and pipes for supplying the heat medium S (S1, S2) to the vulcanization container 9. The vulcanization container 9 has an upper and lower hot plates 11a and 11b, a container ring 10 arranged between the upper and lower hot plates 11a and 11b, and a plurality of segments 12. The container ring 10 corresponds to the side surface portion of the vulcanization container 9.

The pipes constituting the vulcanization system 1 include one system of heat source lines 2, a hot plate supply line 3a, and a side surface supply line 3b. The heat source line 2 supplies steam (saturated steam) or the like from the supply source as the heat medium S.

One end of each of these supply lines 3a and 3b is connected to the heat source line 2. The hot plate supply line 3a is connected to the upper and lower hot plates 11a and 11b. The side supply line 3b is connected to the container ring 10.

A hot plate valve adjusting portion 5 is arranged in the middle of the hot plate supply line 3a. The hot plate valve adjusting unit 5 has a hot plate on-off valve 5a and a hot plate adjusting valve 5b. The hot plate on-off valve 5a makes the hot plate supply line 3a fully open or fully closed. By operating the hot plate on-off valve 5a, the hot plate supply line 3a is immediately switched between fully open and fully closed. The hot plate on-off valve 5a is not particularly limited as long as the hot plate supply line 3a can be fully opened or fully closed and the hot plate supply line 3a can be switched between fully open and fully closed immediately. For example, a piston valve or the like is adopted. To.

The hot plate adjusting valve 5b adjusts the flow rate of the heat medium S flowing through the hot plate supply line 3a. The hot plate adjusting valve 5b is designed to change the flow rate of the heat medium S relatively slowly, and for example, a loose fly valve or the like is adopted.

A side valve adjusting portion 6 is arranged in the middle of the side supply line 3b. The side valve adjusting portion 6 has a side opening / closing valve 6a and a side adjusting valve 6b. The side surface opening / closing valve 6a makes the side surface supply line 3b fully open or fully closed. By operating the side opening / closing valve 6a, the side supply line 3b is immediately switched between fully open and fully closed. The side surface on-off valve 6a is not particularly limited as long as the specifications allow the side supply line 3b to be fully opened or fully closed and the switching between fully open and fully closed can be performed immediately, and for example, a piston valve or the like is adopted. Will be done.

The side surface adjusting valve 6b adjusts the flow rate of the heat medium S flowing through the side surface supply line 3b. The side surface adjusting valve 6b is designed to change the flow rate of the heat medium S relatively slowly, and for example, a loose fly valve or the like is adopted.

In the brewing system 1 of this embodiment, the hot plate discharge line 4a connected to the lower hot plate 11b, the side discharge line 4b connected to the container ring 10, and the discharge lines 4a and 4b, respectively. It has a temperature sensor 8a for a hot plate and a temperature sensor 8b for a side surface, and a control unit 7a for a hot plate and a control unit 7b for a side surface into which the temperature detected by each of the temperature sensors 8a and 8b is input. There is. The control units 7a and 7b control the hot plate valve adjusting unit 5 and the side surface valve adjusting unit 6, respectively.

2 and 3 illustrate the inside of the vulcanization container 9 in a state where the mold 16 is closed. Inside the vulcanization container 9, a mold 16 and a central mechanism 13 having a central shaft 13a extending vertically are arranged. The mold 16 is composed of a plurality of sectors 16a, an upper side plate 16b, and a lower side plate 16c. Each sector 16a is arranged in an annular shape around the central mechanism 13.

A vulcanization bladder 14 that expands and contracts is attached to the central shaft 13a. The central mechanism 13 is provided with a supply pipe 15a for supplying the heating and pressurizing medium M inside the vulcanization bladder 14, and a discharge pipe 15b for discharging the heating and pressurizing medium M from the inside of the vulcanization bladder 14.

An annular upper side plate 16b is fixed to the lower surface of the upper heat plate 11a that moves up and down, and a container ring 12 is arranged on the outer peripheral side of the upper side plate 16b. An annular lower side plate 16c is fixed to the upper surface of the lower hot plate 11b fixed at a predetermined position.

The plurality of segments 12 are arranged in an annular shape around the central mechanism 13 and are attached to the outer peripheral surface of the corresponding sector 16a. The outer peripheral surface of each segment 12 has an inclined surface that inclines toward the outer peripheral side from the upper side to the lower side.

The container ring 10 which is a side surface portion of the vulcanization container 9 is projected below the plate which moves up and down. A plurality of segments 12 are arranged on the inner peripheral side of the container ring 10. The inner peripheral surface of the container ring 10 has an inclined surface that inclines toward the outer peripheral side from the upper side to the lower side. The inclined surface of the container ring 10 and the inclined surface of each segment 12 rub against each other.

The outer peripheral surface (inclined surface) of each segment 12 is pressed by the container ring 10 that moves downward. As a result, each segment 12 moves toward the central mechanism 13, and each sector 16a is assembled in an annular shape. The upper hot plate 3a and the lower hot plate 3b are in contact with each of the upper and lower sides of each segment 12. The upper side plate 16b and the lower side plate 16c are assembled to the upper and lower sides of the sector 16a assembled in an annular shape, and the mold 16 is closed. In this state, the green tire G arranged inside the mold 16 is vulcanized. At this time, the outer surface of the green tire G is heated by the mold 16, and the inner surface is heated by the expanding vulcanization bladder 14.

Inside the upper and lower hot plates 11a and 11b, a hot plate supply line 3a extends. Then, the hot plate supply line 3a and the hot plate discharge line 4a are connected. Inside the container ring 12, a side supply line 3b extends. Then, the supply line 3b for the side surface portion and the discharge line 4b for the side surface portion are connected.

The heat medium S supplied from the heat source line 2 flows through the hot plate supply line 3a through the hot plate valve adjusting portion 5, and the heat medium S1 passing through the hot plate valve adjusting portion 5 is the upper and lower hot plates. It is distributed to 11a and 11b. The heat medium S1 flows inside the upper and lower hot plates 11a and 11b, so that the upper and lower hot plates 11a and 11b are heated. The upper side plate 16b and the lower side plate 16c are mainly heated by transferring the heat of the heated upper and lower hot plates 11a and 11b, respectively. The outer surface of the side surface portion of the green tire G is heated by the upper side plate 16b and the lower side plate 16c.

The heat medium S supplied from the heat source line 2 flows through the side valve adjusting portion 6 to the side surface supply line 3, and the heat medium S2 passing through the side valve adjusting portion 6 is transferred to the container ring 10. To circulate. The heat medium S2 flows inside the container ring 10 to heat the container ring 10. Each sector 16a is mainly heated by transferring the heat of the heated container ring 10 through the segment 12. The outer surface of the tread portion of the green tire G is heated by the sector 16a.

Hereinafter, the procedure of the tire vulcanization method of the present invention for vulcanizing the green tire G while performing different temperature controls for the upper and lower hot plates 11a and 11b and the container ring 10 using this vulcanization system 1 will be described. explain.

For example, when it is desired to heat the outer surface of the side surface portion of the green tire G at a higher temperature than the outer surface of the tread portion, the upper and lower hot plates 11a and 11b are heated to a higher temperature than the container ring 10. In this case, in the hot plate valve adjusting unit 5, the hot plate supply line 3a is fully opened by the hot plate on-off valve 5a, and the heat source line 2 is adjusted while adjusting the valve opening degree of the hot plate adjusting valve 5b. The high-pressure and high-temperature heat medium S supplied from the hot plate supply line 3a is passed through the hot plate supply line 3a.

Since the pressure and temperature of the heat medium S do not decrease so much by the control by the hot plate valve adjusting unit 5, the heat medium S1 maintained at a relatively high pressure and high temperature flows through the hot plate supply line 3a. The hot plate on-off valve 5a is operated when the pressure (temperature) of the heat medium S supplied from the heat source line 2 becomes excessive to fully close the hot plate supply line 3a.

On the other hand, in the side valve adjusting portion 6, the valve opening degree of the side adjusting valve 6b is adjusted while appropriately switching between fully open and fully closed of the side supply line 3b by the side opening / closing valve 6a. , The high-pressure and high-temperature heat medium S supplied from the heat source line 2 is passed through the side surface supply line 3b. By operating the side surface on-off valve 6a, the flow rate of the heat medium S supplied to the side surface supply line 3b can be immediately reduced to zero.

Therefore, the pressure and temperature of the heat medium S can be significantly reduced by the control by the side valve adjusting unit 6. As a result, the heat medium S2 maintained at a relatively low pressure and a low temperature flows through the side supply line 3b.

The high-pressure and high-temperature heat medium S supplied by the same heat source line 2 in this way is the heat medium S1 maintained at a relatively high pressure and high temperature, and the heat medium S maintained at a relatively low pressure and low temperature. The temperature of the upper and lower heat plates 11a and 11b and the container ring 10 are controlled independently of each other by changing to S2. Along with this, the upper and lower hot plates 11a and 11b are heated to a higher temperature than the container ring 10.

According to the present invention, even if the heat source line 2 has only one system, the green tire G is subjected to different temperature control for the upper and lower hot plates 11a and 11b and the container ring 10 as described above. Can be vulcanized. Therefore, it is not necessary to install a plurality of separate heat source lines for supplying steam having different pressures, and it is possible to avoid complication of the equipment.

The temperature control for the hot plates 11a and 11b is performed based on, for example, the temperature of the heat medium S1 immediately after the upper and lower hot plates 11a and 11b are circulated. Specifically, the temperature of the heat medium S1 is detected by the hot plate temperature sensor 8a. Then, based on the comparison between the detected temperature of the heat medium S1 and the preset target temperatures (hot plate target temperatures) for the hot plates 11a and 11b, the control unit 7a operates the hot plate on-off valve 5a and heats the heat. The valve opening degree of the plate adjusting valve 5b is controlled to control the flow rate of the heat medium S1 flowing through the hot plate supply line 3a. The heating condition for the hot plates 11a and 11b is increased or decreased by increasing or decreasing the flow rate of the heat medium S1. As a result, the temperature of the heat medium S1 can be accurately controlled, and the hot plates 11a and 11b can be maintained at the target temperature (predetermined temperature range).

The temperature control for the container ring 10 is performed based on, for example, the temperature of the heat medium S2 immediately after the container ring 10 is circulated. Specifically, the temperature of the heat medium S2 is detected by the side temperature sensor 8b. Then, based on the comparison between the detected temperature of the heat medium S2 and the preset target temperature for the container ring 10 (side surface target temperature), the control unit 7b operates the side surface on-off valve 6a and for the side surface. The valve opening degree of the adjusting valve 6b is controlled to control the flow rate of the heat medium S2 flowing through the side supply line 3b. The heating condition for the container ring 10 is increased or decreased by increasing or decreasing the flow rate of the heat medium S2. As a result, the temperature of the heat medium S2 can be accurately controlled, and the container ring 10 can be maintained at the target temperature (predetermined temperature range).

When it is desired to heat the outer surface of the side surface portion of the green tire G at a lower temperature than the outer surface of the tread portion, the upper and lower hot plates 11a and 11b are heated to a lower temperature than the container ring 10. In this case, the control in the hot plate valve adjusting unit 5 and the control in the side surface valve adjusting unit 6 described above may be interchanged with each other.

In the present invention, the difference between the hot plate target temperature and the side surface target temperature is set to, for example, 15 ° C. or higher, or 20 ° C. or higher. Thereby, the temperature difference between the heated hot plates 11a and 11b and the heated container ring 10 can be set to 15 ° C. or higher, or 20 ° C. or higher. The upper limit of the difference between the hot plate target temperature and the side surface target temperature is, for example, about 40 ° C.

In the above embodiment, the hot plate valve adjusting unit 5 and the side surface valve adjusting unit 6 have the hot plate on-off valve 5a and the side surface on-off valve 5b, respectively, but the on-off valves 5a and 5b Either one can be omitted. In the embodiment illustrated in FIG. 4, the hot plate on-off valve 5a is omitted, and the hot plate valve adjusting portion 5 has only the hot plate adjusting valve 5b.

When an appropriate high-pressure and high-temperature heat medium S is supplied to the heat source line 2 in order to heat the upper and lower hot plates 11a and 11b to the target temperature, the heat plate S is used in the hot plate valve adjusting unit 5. There is no need to significantly adjust the flow rate (temperature) of. Therefore, even in the manufacturing system 1 illustrated in FIG. 4, the green tire G can be vulcanized while controlling the temperatures of the upper and lower hot plates 11a and 11b and the container ring 10 differently.

The green tire G having the same specifications was vulcanized using the manufacturing system 1 having the same specifications illustrated in FIG. At that time, the flow rate of the heat medium S1 flowing through the hot plate supply line 3a and the flow rate of the heat medium S2 flowing through the side surface supply line 3b are adjusted to form the hot plates 11a and 11b and the container ring 10. On the other hand, different temperature controls were performed.

Vulcanization of the green tire G is performed when the side surface on-off valve 6a is appropriately operated (Example) and at a position where the side surface supply line 3b is fully opened without operating the side on-off valve 6a. It was carried out under two types of conditions as in the case of maintaining the condition (comparative example), and the conditions were substantially the same except for the operation of the side opening / closing valve 6a. For Examples and Comparative Examples, the temperatures of the hot plates 11a and 11b and the container ring 10 during vulcanization were measured.

As a result, in the examples, the hot plates 11a and 11b could be maintained at a relatively high temperature and the container ring 10 could be maintained at a relatively low temperature. The temperature difference between the hot plates 11a and 11b and the container ring 10 was about 20 ° C. In the comparative example, the hot plates 11a and 11b could be maintained at a relatively high temperature, but the temperature of the relatively low temperature of the container ring 10 was not stable. Therefore, the temperature difference between the hot plates 11a and 11b and the container ring 10 varied widely between about 5 to 25 ° C.

1 Heat source line 3a Heat plate supply line 3b Side supply line 4a Hot plate discharge line 4b Side discharge line 5 Hot plate valve adjustment part 5a Hot plate on-off valve 5b Hot plate adjustment valve 6 Side valve adjustment part 6a Side part on-off valve 6b Side part adjustment valve 7a Heat plate control part 7b Side part control part 8a Heat plate temperature sensor 8b Side part temperature sensor 9 Sulfurization container 10 Container Ring (side)
11a Upper hot plate 11b Lower hot plate 12 Segment 13 Central mechanism 13a Central shaft 14 Vulcanization bladder 15a Supply pipe 15b Discharge pipe 16 Mold 16a Sector 16b Upper side plate 16c Lower side plate G Green tire

Claims (6)

A vulcanization container in which a mold is installed and a hot plate connected to the upper and lower hot plates, which has a side surface portion arranged between the upper and lower hot plates and the upper and lower hot plates. Supply line, a side supply line connected to the side surface portion, a hot plate adjusting valve installed on the hot plate supply line, and a side surface installed on the side surface portion supply line. In a tire vulcanization system with a control valve for parts
The heat plate adjustment valve and the side surface adjustment valve are independent adjustment valves, and the heat plate supply line and the side surface supply line are independent supply lines. It has the same heat source line to which each of the supply lines is connected, and an on-off valve installed on at least one of the heat plate supply line and the side surface portion supply line, and the on-off valve The installed supply line is fully opened or fully closed by the on-off valve, and the operation of the on-off valve immediately switches between fully open and fully closed only for the supply line. The heat medium supplied from the heat source line is moved up and down through the heat plate supply line by operating the on-off valve and adjusting the flow rate of the heat medium by the heat plate adjusting valve and the side surface adjusting valve. A tire characterized in that the upper and lower heat plates and the side surface portions are independently temperature-controlled by being distributed to the heat plate and distributed to the side surface portion through the side surface portion supply line. Sulfurization system. The tire vulcanization system according to claim 1, wherein the adjusting valve is installed in each of the hot plate supply line and the side surface portion supply line. A heat plate temperature sensor that detects the temperature of the heat medium immediately after the upper and lower heat plates are circulated, a side temperature sensor that detects the temperature of the heat medium immediately after the side surface is circulated, and the heat. It has a plate temperature sensor and a control unit in which the detected temperature is input by the side temperature sensor, and is based on a comparison between the detected temperature by the hot plate temperature sensor and the preset hot plate target temperature. The control unit controls the flow rate of the heat medium flowing through the heat plate supply line, and the control is based on a comparison between the temperature detected by the side temperature sensor and the preset side surface target temperature. The smelting system for a tire according to claim 1 or 2, wherein the flow rate of the heat medium flowing through the supply line for the side surface portion is controlled by the portion. The tire vulcanization system according to claim 3, wherein the difference between the hot plate target temperature and the side surface target temperature is set to 15 ° C. or higher. A hot plate adjusting valve is provided in the hot plate supply line connected to the upper and lower hot plates constituting the vulcanization container, and the upper and lower hot plates are passed through the hot plate adjusting valve and the hot plate supply line. A heat medium is circulated and heated in the vulcanization container, and a side adjustment valve is provided on the side supply line connected to the side surface which is arranged between the upper and lower heat plates. Then, a heat medium is circulated to the side surface portion through the side surface portion adjusting valve to heat the side portion, and the green tire is vulcanized by a tire mold installed inside the vulcanization container. In the method of vulcanizing tires
The heat plate adjustment valve and the side surface adjustment valve are independent adjustment valves, and the heat plate supply line and the side surface supply line, which are independent supply lines, are the same. It is connected to one heat source line, an on-off valve is installed on at least one of the hot plate supply line and the side surface portion supply line, and the supply line on which the on-off valve is installed is fully opened or fully opened by the on-off valve. The on-off valve is set to a fully closed state, and the on-off valve is immediately switched between fully open and fully closed only for the supply line by operating the on-off valve. By adjusting the flow rate of the heat medium with the side surface adjusting valve, the heat medium supplied from the heat source line is circulated to the upper and lower heat plates through the heat plate supply line, and the side surface is supplied. A method for smelting a tire, which comprises circulating to the side surface portion through a line and controlling the temperature of the upper and lower heat plates and the side surface portion independently of each other. The method for vulcanizing a tire according to claim 5, wherein the adjusting valve is installed in each of the hot plate supply line and the side surface supply line.

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