JP2002036243A - Vulcanizing machine and vulcanization system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vulcanizing machine which keeps an energy loss at a low level and can be easily transferred to a different installation site and further, can be newly installed at a low cost. SOLUTION: Electric heaters 6a, 6b and 6C are arranged in a lower side mold 5 coming into contact with the lower side wall 4b of a green tire 4, an upper side mold 25 coming into contact with the upper side wall 4b' and a split mold 26 positioned in the outer peripheral direction of a tread part 4a respectively. The electric heaters 6a, 6b and 6c supply heat to each of the molds 5, 25 and 26 by heat conduction and thereby the green tire 4 is heated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vulcanizer used for vulcanizing green tires and a vulcanizing system having one or more vulcanizers.

[0002]

2. Description of the Related Art Usually, when a green tire is vulcanized and formed, a mold (mold) in which the green tire is loaded is heated by a heating medium and a high-temperature and high-pressure heating is performed in an inner space of the green tire. By supplying the medium, the tire inner wall surface is pressed in the mold direction while being heated. Then, vulcanization is performed by heating the raw tire from the outside and the inside with the heated mold and the heating medium in the inner space of the raw tire.

[0003] As a heating medium used for the above vulcanization molding, steam generated by a boiler can be used. By connecting the boiler and the vulcanizer installed at a location relatively distant from the vulcanizer, such as outside the building, via a pipe, the steam created by the boiler is supplied to the vulcanizer via the pipe. Generally, the configuration is as follows. Further, when vulcanization molding is performed by a plurality of vulcanizers, as shown in FIG. 10, since one vulcanizer 117 is shared by each vulcanizer 116, each vulcanizer 116 is separated from the vulcanizer 116. The steam generated by the main boiler 117 is distributed to the respective vulcanizers 116 by connecting the main boiler 117 installed at a location where the main boiler 117 is connected via a branch pipe 118.

[0004]

However, in the above-described structure, when steam is supplied from the boiler to the vulcanizer via the pipe, most of the calorific value of the steam is lost due to heat radiation from the pipe. However, there is a problem that a large energy loss occurs. In particular, when one boiler 117 is shared by a plurality of vulcanizers 116 as shown in FIG.
The energy loss due to heat radiation from the vehicle becomes enormous.

[0005] Further, as described above, when the steam from the boiler is supplied to the vulcanizer through a pipe, when the vulcanizer is relocated to another place, the vulcanizer is relocated. Since piping work is required together with the work, there is a problem that the factory layout cannot be easily changed. Furthermore, when a new vulcanization facility is installed, it is necessary to install a boiler together with the vulcanizer, so even small-scale vulcanization equipment that performs vulcanization molding with a small number of vulcanizers requires large costs. There is a problem.

Accordingly, an object of the present invention is to provide a vulcanizing machine and a vulcanizing system which can be easily relocated with low energy loss and can be newly installed at low cost.

[0007]

According to a first aspect of the present invention, there is provided a vulcanizer for heating a green tire held in a plurality of molds to perform vulcanization molding. The tire can be heated by supplying heat to the mold by heat conduction, and includes an electric heater disposed in or near the mold.

[0008] According to the above configuration, the electric heater disposed in or near the mold can heat the green tire through the mold by heat conduction. It is no longer necessary to supply a heating medium via a pipe from a boiler located at a different location from the vulcanizer, and the heat generated by the electric heater can be supplied to the mold and green tires with almost no energy loss become. Further, since no boiler or piping is required, the vulcanizer can be easily relocated and a new vulcanizing facility can be installed at low cost. In addition, since the electric heater is disposed in or near the mold, it is possible to perform temperature heating control excellent in constant temperature and responsiveness. Furthermore, the electric heater only needs to replenish the amount of heat consumed by the tire vulcanization, so that it is also excellent in energy efficiency.

In the first aspect of the present invention, the term "in the vicinity of the mold" means that the heat from the electric heater is transmitted to the mold by heat conduction through a fixing member existing therearound and vulcanizes the green tire. It shall mean the range in which the mold is heated to a sufficient degree.

According to a second aspect of the present invention, there is provided the vulcanizer according to the first aspect, wherein a plurality of the electric heaters are provided for one mold. According to the above configuration, when a failure occurs, only the failed electric heater needs to be replaced from the plurality of electric heaters, and replacement and maintenance work of the electric heater can be easily performed.

According to a third aspect of the present invention, in the vulcanizer according to the second aspect, the plurality of electric heaters are radially arranged around a central portion of the green tire. According to the above configuration, unevenness in the temperature distribution in the mold can be reduced, and a more uniform temperature distribution can be realized.

According to a fourth aspect of the present invention, there is provided the vulcanizer according to the second or third aspect, wherein the plurality of electric heaters are divided into at least two groups according to length. According to the above configuration, it is possible to appropriately adjust the arrangement density of the electric heater in the mold, so that the unevenness of the temperature distribution in the mold can be reduced, and a more uniform temperature distribution can be realized. .

For example, simply arranging a plurality of electric heaters of the same length radially around the center of the raw tire increases the distance between the electric heaters near the periphery of the mold, and causes the electric heater peripheral part to be electrically connected to the electric heater. Relatively large temperature unevenness may occur in a circumferential direction between a portion distant from the heater and the heater. However, if the above configuration is adopted and a relatively short electric heater is additionally arranged between the electric heaters near the periphery of the mold, a high temperature unevenness reduction effect can be obtained, particularly in the circumferential direction.

According to a fifth aspect of the present invention, there is provided the vulcanizer according to any one of the second to fourth aspects, wherein at least one of the plurality of electric heaters has a non-uniform heating value along a longitudinal direction. Features. According to the above configuration, the distribution of the amount of heat generated from the electric heater in the mold can be appropriately adjusted, so that the unevenness of the temperature distribution in the mold can be reduced, and a more uniform temperature distribution can be realized. be able to.

For example, simply arranging an electric heater having a constant calorific value along the longitudinal direction radially around the center of the green tire will cause the density of the electric heater at the center of the mold to be higher than that near the periphery. This may cause relatively large temperature unevenness in the radial direction. However, by adopting the above configuration and arranging an electric heater that generates a large amount of heat toward the peripheral portion of the mold and generates a small amount of heat toward the central portion, it is possible to reduce high temperature unevenness particularly in the radial direction. The effect can be obtained. In addition,
The amount of heat generated along the longitudinal direction of the electric heater can be changed, for example, by changing its thickness.

According to a sixth aspect of the present invention, there is provided the vulcanizer according to any one of the second to fifth aspects, wherein at least one of the plurality of electric heaters includes a plurality of the electric heaters adjacent to each other. It is characterized in that temperature control is performed for every two blocks. According to the above configuration, the temperature control unit for one mold can be subdivided, so that a more uniform temperature distribution in the mold can be realized and the temperature distribution in the mold can be adjusted with a high degree of freedom. .

According to a seventh aspect of the present invention, there is provided a vulcanizing system having one or more vulcanizers for heating and vulcanizing and molding a green tire held in a mold and a bladder. A first calorie supply means capable of heating a green tire is provided separately for each of the vulcanizers.

According to the above configuration, since the first heat supply means is provided separately for each vulcanizer, each vulcanizer can be easily installed without requiring complicated piping work. It is possible to relocate to another location. In addition, as the first heat amount supply unit, an electric heater that supplies heat to the mold via a heating medium, or the like can be used, in addition to an electric heater that supplies heat to the mold by heat conduction.

According to an eighth aspect of the present invention, in the vulcanization system according to the seventh aspect, the first calorie supply means is provided in or near the mold. According to the above configuration, vulcanization molding can be performed with smaller energy loss.

According to a ninth aspect of the present invention, there is provided the vulcanizing system according to the seventh or eighth aspect, wherein the heating medium is heated to supply heat to the bladder via the heating medium to heat the green tire. The second calorie supply means is provided separately for each of the vulcanizers. According to the above configuration, since the second calorie supply means is provided separately for each vulcanizer, each vulcanizer can be easily placed in another place without requiring complicated piping work. It is possible to relocate to

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the vulcanizer 1 according to the present embodiment includes a mold fixing section 2 set at a predetermined height, and a mold elevating section 3 which moves up and down with respect to the mold fixing section 2. And The mold fixing part 2 includes a raw tire 4
Lower side mold 5 abutting on lower side wall 4b
And a center mechanism 10 penetrating the center of the lower side mold 5 and a base frame 11 supporting the center mechanism 10.

As shown in FIG. 4, the raw tire 4 includes a carcass assembly 51 having both ends bent, and a carcass assembly 5.
A metal bead wire 52 provided at one bent portion;
A rubber inner liner 53 attached to the inner peripheral surface of the carcass assembly 51, and a rubber tread member 54 attached to the outer peripheral surface and the side peripheral surface of the carcass assembly 51, respectively.
And the side wall member 55 and the metal belt member 56 provided between the tread member 54 and the carcass assembly 51, so that the tread portion 4a and the bead portions 4c and 4c 'having a large thickness can be provided inside the tire. It has a configuration having metal members (bead wire 52, belt member 56).

As shown in FIG. 6, 32 straight rod-shaped electric heaters 6a (1) to 6a (32) are provided in the lower side mold 5 to heat it to a predetermined temperature. Are radially arranged at equal angular intervals around the center of the. Each of the electric heaters 6a (1) to 6a (32)
The length is slightly shorter than the radius of the lower side mold 5. The electric heater 6a (4) and the electric heater 6a
(5), the electric heater 6a (12) and the electric heater 6
a (13), between the electric heater 6a (20) and the electric heater 6a (21), and between the electric heater 6a (2)
8) and the electric heater 6a (29), the temperature sensors 8 in the form of straight rods are respectively arranged near the periphery of the lower side mold 5.

32 arranged in the lower side mold 5
The electric heaters 6a (1) to 6a (32) have four blocks (6a (1) to 6a (8); 6a (9) to 6a for each of the eight electric heaters near each temperature sensor 8. (1
6); 6a (17) to 6a (24); 6a (25) to 6
a (32)), temperature control is performed separately. That is, the temperature of the electric heater 6a belonging to each block is controlled by a temperature controller (not shown) based on the temperature detected by the temperature sensor 8 arranged in each block.

As described above, in the present embodiment, the temperature of the 32 electric heaters 6a is not controlled collectively by using only one temperature sensor, but divided into four blocks to individually control the temperature of each block. Therefore, a more uniform temperature distribution in the lower side mold 5 can be realized. For example, when the temperature in one block becomes higher than that of another block due to a change in the external environment, if the control is performed so as to suppress the heat generation of the electric heater 6a belonging to this block, the temperatures of all the blocks are reduced. Can be kept the same. On the contrary, it is possible to cope with a manufacturing requirement such that the temperature in one block is higher than that in another block, and the temperature distribution in the lower side mold 5 can be adjusted with a high degree of freedom. become able to.

As shown in FIG. 2, the center mechanism 10 penetrating the center of the lower side mold 5 has a lower ring mechanism 12 fixed to the lower side mold 5. The lower ring mechanism 12 includes a lower bead portion 4 of the raw tire 4.
c, a lower bead ring 13 formed so as to abut against c.
It has a lower bladder ring 14 provided on the upper surface of the lower bead ring 13 and holding the lower edge of the bladder 20 together with the lower bead ring 13, and a clamp ring hub 15 provided on the inner peripheral side of the lower bladder ring 14. .

Inside the clamp ring hub 15, there are formed supply / discharge paths 15a and 15b through which the heating medium flows. These supply / discharge passages 15a and 15b are communicated from the upper end surface to the lower end surface of the clamp ring hub 15. Furthermore, the lower ends of the supply / discharge paths 15a and 15b are connected to a heat amount supply unit 74 that heats the heating medium to replenish the heat loss of the heating medium. The calorie supply unit 74 supplies the heating medium used for vulcanization molding to the supply / discharge path 15.
It has a circulation path which is taken out from the lower ends of the a and 15b and returned to the original state.

This circulation path is connected to pipes 73a and 73b connected to the supply port 17a and the discharge port 17b of the supply and discharge paths 15a and 15b, respectively, and to one pipe 73b.
And a delivery device 76 such as a fan or a pump for forcibly sucking and delivering the heating medium. The transmitter 76 is provided in the calorie supply unit 74. The calorie supply unit 74 includes the transmitter 7
6, an electric heater 77 such as an electromagnetic induction heater or a resistance heater for heating a heating medium flowing through a circulation path such as the pipes 73a and 73b. The electric heater 77 is connected to a temperature control device and a power supply device (not shown), and the driving power is controlled so as to control the heating medium to a predetermined temperature. Then, the bladder 20 and the raw tire 4 are heated to a predetermined temperature while the heating medium is circulated by the calorie supply unit 74.

Lower ring mechanism 1 constructed as described above
A center post 22 is vertically slidably provided at the center of the center 2. An upper ring 19 is provided at the upper end of the center post 22. Upper ring 19
Has an upper bladder ring 21, which holds the upper edge of the bladder 20. On the other hand, a post elevating mechanism (not shown) capable of elevating the center post 22 to an arbitrary height position is connected to the lower end of the center post 22. Then, the post elevating mechanism raises the upper edge of the bladder 20 when loading and unloading the raw tire 4, and raises the center post 22 to the upper limit position so that the bladder 20 is set to a diameter smaller than the tire hole of the raw tire 4. On the other hand, during vulcanization molding of the green tire 4, the center post 22 is lowered so as to enlarge the bladder 20 to a diameter capable of contacting the inner wall surface of the green tire 4.

The bladder 20 expanded and contracted by the center post 22 presses the inner wall surface of the tire 4 in the mold direction by supplying a heating medium during vulcanization molding of the green tire 4, and the bladder 20 deteriorates under a high temperature environment. It has a hardly stretchable material as a constituent member. The low-stretch material is formed to have substantially the same shape as the inner wall surface of the tire when the green tire 4 is vulcanized and formed into a vulcanized tire. That is, as shown in FIG. 5, the bladder 20 employs a low-stretch material that is hardly deteriorated in a high-temperature environment, and has a bladder body 20a formed to have substantially the same shape as the tire inner wall surface shape of the vulcanized tire.
And a plurality of magnetic members 20b provided at equal intervals on the surface of the bladder main body 20a. The magnetic member 20b is made of a magnetic thin film (magnetic material) such as a mesh metal or a metal deposition film, and a portion corresponding to the tread portion 4a of the raw tire 4 has a larger area than other portions. It is formed so that it becomes.

The low-stretch material is a material having a lower elongation than a conventional bladder rubber (for example, butyl rubber) in a high-temperature environment of a vulcanization temperature, and particularly 200 5% to 15% elongation under high temperature environment
% Is preferable. The reason why the elongation percentage is preferably in the above range is that if it is less than 5%, the force for uniformly pressing the entire green tire 4 during vulcanization molding is reduced, resulting in insufficient moldability. , Over 15%
This is because it becomes difficult to vulcanize and mold the raw tire 4 with high precision, similarly to the conventional bladder rubber (for example, butyl rubber).

Examples of the low-stretch material that is hardly deteriorated in a high-temperature environment include a knitted or woven fabric using fibers such as polyester, nylon, aramid, and paraphenylenebenzobisoxazole (PBO); Carbon-containing fibers, metal-coated fibers, resin-coated fibers, and the like can be employed, and a mixture of one or more of these materials can be employed. Examples of the mixed form include a form in which a mesh metal is laminated on a polyester film, a form in which a metal film is deposited on a polyester film, and a form in which metal-coated fibers and high-density fibers are uniformly or unevenly woven. . There is also a form in which at least one of a resin such as fluorine and silicon and an elastomer is impregnated or coated on the above-described base material such as a knitted fabric or a woven fabric in order to impart airtightness. And these forms are
It is appropriately selected according to the design specifications of the bladder (presence or absence of heat due to induction heating, strength, etc.).

Inside the bladder 20, an induction heating coil 2 is provided.
3 are arranged. The induction heating coil 23 is provided around the center post 22, and the upper bladder 2
1 and the lower bladder ring 14 are set to a coil height smaller than the distance when they are closest to each other, and set to a coil diameter smaller than the outer diameter of both rings 21 and 14 so as not to contact the reduced bladder 20. Have been. Further, the induction heating coil 23 is arranged so as not to come into contact with both the rings 21 and 14 even when the upper bladder ring 21 is lowered to the lower limit position. A high-frequency power supply 24 is connected to the induction heating coil 23 configured as described above, and the induction heating coil 23 applies a high-frequency magnetic field to the bladder 20 by supplying high-frequency power.
The magnetic member 20b of the bladder 20 is preferentially induction heated.

As shown in FIG. 1, a mold elevating section 3 is provided above a center post 22 for expanding and contracting the bladder 20. The mold elevating unit 3 includes an upper side mold 25 that abuts on the upper sidewall 4b ′ of the raw tire 4, a split mold 26 located in the outer peripheral direction of the tread portion 4a of the raw tire 4, an upper side mold 25 and a split mold 26. Mold elevating mechanism 27 for elevating and lowering the slide segment 26a of the mold, and a mold elevating mechanism 29 for elevating and lowering the fixed segment 26b of the split mold 26
And a support member 30 for supporting these mechanisms 27 to 29 and the like.

In order to heat the upper mold 25 to a predetermined temperature, similarly to the electric heater 6 a in the lower mold 5, a plurality of electric rods are formed radially around the center of the raw tire. The heater 6b is arranged.
Although not shown, a plurality of straight rod-shaped temperature sensors are arranged in the upper side mold 25 similarly to the temperature sensor 8 in the lower side mold 5. Then, similarly to the electric heater 6a in the lower side mold 5, the temperature of the electric heater 6b in the upper side mold 25 is controlled for each block including eight electric heaters.

In the slide segment 26a of the split mold 26, a straight rod-shaped electric heater 6c is arranged for heating the tread mold 26a 'of the slide segment 26a to a predetermined temperature. The slide segments 26a are block bodies, and are arranged at equal intervals on the same circumference centered on the center of the upper side mold 25. An electric heater 6c and a temperature sensor (not shown) are arranged in each block body, and temperature control is performed separately for each block body.

A rod 35 of the mold elevating mechanism 27 is inserted through the center of the supporting member 30 so as to be able to move up and down.
A disc-shaped slide plate 36 is provided at a lower end of the rod-shaped member 35. At the center of the lower surface of the slide plate 36, the above-described upper side mold 25 is fixed to the center side. An upper bead ring 40 formed to be in contact with the upper bead portion 4c 'of the raw tire 4 is provided on the inner peripheral portion of the upper side mold 25.

A plurality of slide segments 26a are provided on the outer periphery of the lower surface of the slide plate 36. Each slide segment 26a includes a tread mold 26a 'formed so as to abut the tread portion 4a of the raw tire 4, and is arranged at equal intervals on the same circumference centered on the upper side mold 25, and It is engaged with the slide plate 36 so as to be movable in the direction. A fixing ring 26b is arranged outward of the slide segments 26a. The fixing ring 26b is fixed to the lower peripheral edge of the upper support 33, and moves the slide segment 26a in the radial direction while engaging with the outer surface of the slide segment 26a. The tread mold 26a 'of the slide segment 26a forms a cylindrical mold corresponding to the tread portion 4a of the raw tire 4 when moved in the center direction by the fixing ring 26b.

On the other hand, as shown in FIG. 1, the upper end of the rod-shaped member 35 is connected to a cylinder member 37 supported by the insertion portion 33a. Thereby, the mold elevating mechanism 27 having the cylinder member 37 and the like
Through the slide plate 36 (upper side mold 2)
5. The slide segment 26a) can be moved up and down independently of the upper support 33.

Insertion portion 33a supporting cylinder member 37
The rod-shaped member 35 is movably inserted through the support member 30 while the rod-shaped member 35 is movably inserted therethrough. Also,
On both sides of the insertion portion 33a, the mold elevating mechanism 29 is arranged in a pair of left and right. The mold elevating mechanism 29 has a cylinder member 38 fixed to the upper surface of the support member 30, and the cylinder member 38 has a distal end portion of a cylinder rod 38 a connected to the insertion portion 33 a. Further, a cylindrical shield member 31 which stands down from the peripheral edge of the support member 30 is arranged in the outer peripheral direction of the split mold 26.

The operation of the vulcanizer 1 in the above configuration will be described. First, the mold elevating unit 3 is moved up to position the mold elevating unit 3 above the mold fixing unit 2. Thereafter, the transport device 43 transports the raw tire 4 between the mold fixing unit 2 and the mold elevating unit 3.
When the tire hole of the raw tire 4 is located above the center post 22, as shown in FIG.
Then, the upper edge of the bladder 20 is lifted through the opening, and the bladder 20 is reduced to a diameter smaller than the tire hole of the raw tire 4. Then, the raw tire 4 is lowered, and the raw tire 4 is placed on the lower side mold 5 while the center post 22 and the bladder 20 are inserted through the tire holes of the raw tire 4.

Next, by causing the cylinder rod 38a to advance from the cylinder member 38 and the rod-shaped member 35 to advance from the cylinder member 37, the slide plates 36 are respectively lowered and separated, and the slide segments 26a are moved in the outer peripheral direction. Let it. Thereafter, as shown by a two-dot chain line in the figure, the mold lifting unit 3 is lowered while maintaining the separated state of the slide plate 36, and the raw tire 4 is positioned on the inner peripheral side of the slide segment 26a. Is moved toward the center by the fixing ring 26b. Then, as shown in FIG. 3, the respective slide segments 26a are brought into contact with each other to form a cylindrical mold corresponding to the tread portion 4a of the raw tire 4, and an upper side mold 25 and The mold clamping of the mold is completed by bringing the lower side molds 5 into contact with each other.

The molds 5, 25, 26a 'are heated by the electric heater 6a in the lower side mold 5, the electric heater 6b in the upper side mold 25, and the electric heater 6c in the slide segment 26a. Raise the temperature to the desired temperature. Thereby, the raw tire 4 is heated from the outer surface side.

Also, almost simultaneously with heating from the outer surface side of the raw tire 4 by raising the temperature of each of the molds 5, 25, 26a ',
A heating medium is supplied into the bladder 20 from the supply port 17a, and the bladder 20 is advanced to be in close contact with the inner wall surface of the raw tire 4,
The green tire 4 is pressed in the mold direction. Then, the calorie of the heating medium is transmitted to the raw tire 4 via the bladder 20, thereby heating the raw tire 4 from the inner surface side.

Here, in the heat supply section 74, the heating medium in the ladder 20 is taken out from the clamp ring hub 15 and the discharge port 17b to the outside via one pipe 73b.
After passing through the electric heater 77 in the calorie supply device main body,
The heating medium is circulated between the inside of the ladder 20 and the calorie supply means 74 by a series of operations of feeding the heat from the supply port 17a into the clamp ring hub 15 through the other pipe 73a. Normally, a heating and pressurizing medium such as high-temperature and high-pressure steam or nitrogen gas is used as a heating medium of the calorie supply unit 74.

At this time, drive power is supplied to the electric heater 77 to cause the electric heater 77 to generate heat, and to heat the heating medium passing through the electric heater 77. Then, the temperature of the heating medium is detected by a temperature detector (not shown), and when the temperature of the heating medium reaches a desired temperature, a loss of heat due to heat radiation during circulation and a decrease in heat due to vulcanization are supplemented. The heating medium is maintained at a desired temperature by controlling the electric power supplied to the electric heater 77.

Further, as shown in FIG.
4 supplies the induction heating coil 23 with high-frequency power. The induction heating coil 23 supplied with the high-frequency power is a bladder 2
A strong high-frequency magnetic field is applied to the zero magnetic member 20b to cause the bladder 20 itself to generate heat. Therefore, when the calorie of the heating medium is transmitted to the green tire 4 via the bladder 20, the delay in the time for transmitting the calorie by the bladder 20 is minimized, so that the green tire 4 can be vulcanized in a shorter time. Heat up to temperature. In particular, since the magnetic member 20b of the bladder 20 is formed such that a portion corresponding to the tread portion 4a has a larger area than other portions, the temperature rise in the tread portion 4a of the raw tire 4 becomes remarkable.

While the green tire 4 is being vulcanized, the bladder 20 presses the green tire 4 in the molding direction to form the green tire 4. On this occasion,
Since the bladder 20 is formed of a low-stretch material having substantially the same shape as the inner wall surface of the vulcanized tire, even if the pressure of the pressurized medium slightly changes, the The shape of the inner wall surface appears with certainty. Accordingly, when the green tire 4 is pressed by the bladder 20 to perform molding, a vulcanized tire molded with high precision is obtained.

When the vulcanized tire is obtained in this manner, as shown in FIG. 2, the mold is opened by an operation reverse to the above-described operation, and then the bladder 20 is reduced, and the vulcanized tire is reduced. The tires are held by a carry-out device and carried out. Thereafter, a new green tire 4 is carried in and vulcanization molding is repeated. Even when such vulcanization formation is repeated, the low-stretch material of the bladder 20 is unlikely to deteriorate in a high-temperature environment. Therefore, the low-stretch material maintains the initial properties. Therefore, even when the number of repetitions of vulcanization molding increases, the bladder 20 can be used for a long period of time because the bladder 20 ensures the appearance of the inner wall surface of the vulcanized tire.

As described above, according to the present embodiment,
Electric heater 6 arranged in molds 5, 25, 26a
a, 6b, and 6c are molds 5, 25, and 2 by heat conduction.
In order to heat the raw tire 4 from the outside via 6a, a boiler provided at a place different from the vulcanizing machine to supply heat to the molds 5, 25, 26a as in the prior art is connected via piping. There is no need to supply a heating medium, and the amount of heat generated by the electric heaters 6a, 6b, 6c can be reduced with little energy loss to the molds 5, 25, 26a and the raw tires 4.
Can be supplied to Further, since no boiler or piping is required, the vulcanizer can be easily relocated and a new vulcanizing facility can be installed at low cost. The electric heaters 6a, 6b, 6c are
Since they are arranged in the insides 25 and 26a, temperature heating control excellent in constant temperature characteristics and responsiveness is possible. Furthermore, the electric heaters 6a, 6b, and 6c need only replenish the amount of heat consumed by tire vulcanization, so that they are also excellent in energy efficiency.

In the present embodiment, each mold 5,
A plurality of electric heaters 6a and 6b are arranged in 25. Therefore, when a failure occurs, a plurality of electric heaters 6
Only the failed electric heaters 6a and 6b need to be replaced among the electric heaters 6a and 6b, and the replacement and maintenance work of the electric heaters 6a and 6b can be easily performed. In addition, only one relatively large electric heater may be arranged in each of the molds 5 and 25.

In this embodiment, since the plurality of electric heaters 6a, 6b, 6c are arranged radially around the center of the raw tire 4, the molds 5, 25, 2
6a can reduce the unevenness of the temperature distribution,
A more uniform temperature distribution can be realized. The plurality of electric heaters 6a, 6b, 6c do not necessarily have to be arranged radially as shown in FIG. 6, but may be arranged regularly so as to obtain a certain uniform temperature distribution.

Next, a modification example of the arrangement of the electric heater in the vulcanizer 1 of the present embodiment shown in FIG.
This will be described with reference to FIGS.

First, in the modified example shown in FIG. 7, as in the case shown in FIG.
(1 ′) to 6a (32 ′) are arranged in the lower side mold 5 radially around the center of the raw tire 4 at equal angular intervals. However, in this modification, two electric heaters having a length close to the radius of the lower side mold 5 and two electric heaters having a length about half the radius of the lower side mold 5 are alternately arranged. . In addition, the shorter electric heater is arranged near the periphery of the lower mold 5 away from the center.

By setting the lengths of the electric heaters 6a radially arranged in two types, the distance between the electric heaters near the peripheral portion of the lower side mold 5 is large, so that the electric heater peripheral portion is electrically connected to the electric heater peripheral portion. A relatively large temperature unevenness does not occur in the circumferential direction between the portion remote from the heater and the temperature distribution becomes substantially uniform in the circumferential direction even near the peripheral portion of the lower side mold 5. 5 can be effectively reduced.

In the example of FIG. 7, two electric heaters having two different lengths are alternately arranged. However, these electric heaters may be alternately arranged one by one. Three or more different types of electric heaters may be appropriately arranged so that the temperature unevenness of the lower side mold 5 is reduced.

In the modification shown in FIG. 8, 32 straight rod-shaped electric heaters 7a (1) are provided in the same manner as shown in FIG.
7a (32) are arranged in the lower side mold 5 at equal angular intervals radially around the center of the raw tire 4. However, in this modification, each electric heater 7a (1)
7a (32) have the same length, and the thickness is small at the center of the lower side mold 5 and becomes larger toward the outside. Thereby, each electric heater 7a
The amount of heat generated in the longitudinal direction of (1) to 7a (32) increases as going outward.

As described above, since the electric heaters that generate a larger amount of heat as they go to the outside are arranged radially around the center of the raw tire, the electric heater at the center of the lower side mold 5 as shown in FIG. Even if the arrangement density of the heaters 7a (1) to 7a (32) is higher than that in the vicinity of the peripheral portion, considering the longitudinal distribution of the amount of heat generated in each electric heater 7a, as a result, the central portion of the lower side mold 5 There is no significant difference in the amount of heat generated from the electric heater per unit area in the vicinity of the peripheral portion. Therefore, the temperature distribution in the radial direction of the lower side mold 5 is substantially uniform, and the temperature unevenness of the lower side mold 5 can be effectively reduced.

In the example shown in FIG. 8, the thickness of all the electric heaters 7a is increased as going outward.
Electric heaters whose thickness becomes larger as they go outward and electric heaters whose thickness in the longitudinal direction is the same as shown in FIG. 6 may be alternately arranged radially. Further, when the electric heater is radially arranged as shown in FIG. 8, the shape of the electric heater along the longitudinal direction is preferably thinner on the inside and wider on the outer side, but the arrangement pattern of the electric heater is preferably If it has changed, it is preferable to change the shape of the electric heater so as to reduce the unevenness in the amount of generated heat depending on the location.

In the modified examples shown in FIGS. 7 and 8 described above, similarly to FIG. 6, the 32 electric heaters are divided into four blocks each having eight electric heaters. Temperature control is separately performed based on the detected result of the temperature sensor 8.

Next, a vulcanization system having a plurality of vulcanizers equivalent to those described above will be described with reference to FIG.
In FIG. 9, five vulcanizers 1 are shown in FIGS.
This is a simplified drawing of a vulcanizer equivalent to that described based on FIG. As described above, these include electric heaters 6a, 6b, and 6c for heating the green tire from the outside by supplying heat to the mold by heat conduction.
And an electric heater 77 for supplying heat to the bladder through the heating medium by heating the heating medium to heat the green tire from the inside separately (that is, independently provided) for each vulcanizer 1. T) provided.

As described above, in the vulcanization system shown in FIG. 9, the electric heaters 6a, 6b, 6c,
Since 77 is provided separately for each vulcanizer 1,
It does not require a centralized heating source as in conventional boilers.
Therefore, each vulcanizer 1 can be easily relocated to another place without requiring complicated piping work for connecting the boiler and each vulcanizer 1. Further, it is possible to reduce energy loss from a pipe connecting the boiler and each vulcanizer.

As means for heating the raw tire from the outside, instead of the electric heaters 6a, 6b and 6c for supplying heat to the mold by heat conduction, a heat supply section for heating the raw tire from the inside is used. Similarly to 74, an electric heater or the like that supplies heat to the mold via a heating medium can be used. However, as in the above-described example, by arranging the electric heaters 6a, 6b, and 6c in or near the mold and supplying heat to the mold by heat conduction, loss of heat from pipes and the like is reduced. Vulcanization molding can be performed with smaller energy loss.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various design changes may be made within the scope described in the claims. This is possible, and may be implemented with the following modifications, for example. (1) Electric heater 6 in each mold 5, 25, 26a
a, 6b, 6c instead of or in addition to the electric heater in the mold, each mold 5, 25, 26a
An electric heater may be arranged in the vicinity to heat each of the molds 5, 25, 26a by heat conduction. For example, an electric heater may be arranged in a support plate installed above the upper side mold 25 or below the lower side mold 5. However, arranging the electric heater in the mold 5, 25, 26a or as close to the mold as possible results in less energy loss and is more convenient in terms of temperature control responsiveness. (2) The number and shape of the electric heaters arranged in one mold may be appropriately changed. Further, the number and the shape of the temperature sensors arranged in one mold may be appropriately changed, and the number of the electric heaters in the block which is a temperature control unit may be appropriately adjusted.

[0066]

As described above, according to the vulcanizer of the present invention, the green tire can be heated by the electric heater disposed in or near the mold. It is no longer necessary to supply a heating medium via a pipe from a boiler provided at a different location from the vulcanizer to supply heat to the mold, and the heat generated by the electric heater is supplied to the mold with almost no energy loss It becomes possible. Further, since no boiler or piping is required, the vulcanizer can be easily relocated and a new vulcanizing facility can be installed at low cost. In addition, since the electric heater is disposed in or near the mold, it is possible to perform temperature heating control excellent in constant temperature and responsiveness. In addition, the electric heater only needs to replenish the amount of heat consumed by tire vulcanization,
It is also excellent in energy efficiency.

According to the vulcanizing system of the present invention, the first calorie supply means for supplying the calorie necessary for heating the green tire from the outer surface to the mold is separately provided for each vulcanizer. Since it is provided, vulcanization molding can be performed with a small energy loss.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a side surface of a vulcanizer according to an embodiment of the present invention (when a raw tire is carried in).

FIG. 2 is a schematic cross-sectional view of a side surface of a vulcanizer (at the time of green tire mold clamping) according to an embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view of a side surface of a vulcanizer according to one embodiment of the present invention (when green tire mold clamping is completed).

FIG. 4 is an exploded perspective view showing a main part of a raw tire.

FIG. 5 is a schematic sectional view of a tire mold and a green tire during vulcanization.

FIG. 6 is a plan view of a lower side mold.

FIG. 7 is a plan view of another lower side mold on which an electric heater is arranged.

FIG. 8 is a schematic sectional view of another mold on which an electric heater is arranged.

FIG. 9 is a schematic diagram of a vulcanization system according to one embodiment of the present invention.

FIG. 10 is a schematic view of a conventional vulcanization system.

[Explanation of symbols]

 Reference Signs List 1 vulcanizer 2 mold fixing part 3 mold elevating part 4 raw tire 5 lower side mold 6a, 6b, 6c electric heater 8 temperature sensor 10 center mechanism 12 lower ring mechanism 19 upper ring mechanism 20 bladder 22 center post 25 upper side mold 26 Split mold 74 Heat supply unit

Continued on the front page (72) Inventor Kazuto Okada 1-5-5 Takatsukadai, Nishi-ku, Kobe-shi, Hyogo F-term in Kobe Steel Research Institute, Kobe Research Institute (reference) 4F202 AH20 AR06 CA21 CB01 CU03 CU12 CY02 CY08 CY10 4F203 AH20 AR06 DA11 DB01 DC02 DC13 DC15 DL12 DM07

Claims (9)

[Claims] In a vulcanizer for heating and vulcanizing a green tire held in a plurality of molds, it is possible to heat the green tire by supplying heat to the mold by heat conduction. A vulcanizer comprising an electric heater disposed in or near the mold. 2. The vulcanizer according to claim 1, wherein a plurality of the electric heaters are provided for one mold. 3. The vulcanizer according to claim 2, wherein the plurality of electric heaters are radially arranged around a central portion of the green tire. 4. The vulcanizer according to claim 2, wherein the plurality of electric heaters are divided into at least two groups according to length. 5. The vulcanizer according to claim 2, wherein the amount of heat generated along a longitudinal direction of at least one of the plurality of electric heaters is not constant. 6. The temperature control is performed for each of the plurality of electric heaters for at least two blocks each including one or a plurality of the electric heaters adjacent to each other. The vulcanizer according to claim 1. 7. A vulcanization system having one or more vulcanizers for heating and vulcanizing and molding a green tire held in a mold and a bladder, wherein a calorie is supplied to the mold to heat the green tire. A vulcanizing system, characterized in that first calorie supply means capable of being provided are separately provided for each of the vulcanizers. 8. The vulcanization system according to claim 7, wherein the first heat supply means is provided in or near the mold. 9. A second calorie supply means capable of supplying calorie to the bladder via the heating medium by heating the heating medium to heat the green tire, wherein the second calorie supply means is separately provided for each of the vulcanizers. The vulcanization system according to claim 7, wherein the vulcanization system is provided.