Tire vulcanization equipment

Abstract

To provide a tire vulcanization apparatus that can efficiently vulcanize unvulcanized tires with low energy consumption. [Solution] The tire vulcanization apparatus 100 includes a vulcanization mold 1 for vulcanizing the outer surface of an unvulcanized tire T, a vulcanization bladder 2 for expanding inside the cavity of the unvulcanized tire 2 and pressing the unvulcanized tire T against the vulcanization mold 1, a heating device 3 for heating a heat transfer medium G, a supply device 4 for supplying the heated heat transfer medium G into the vulcanization bladder 2, and a volume reduction means 5 disposed inside the vulcanization bladder 2 for reducing the volume of the filling space GS filled with the heat transfer medium G.

Description

Technical Field

[0001] The present invention relates to a tire vulcanizing apparatus.

Background Art

[0002] Conventionally, a technique for vulcanizing a tire using a heat medium has been known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the apparatus disclosed in Patent Document 1 above, a heat medium (steam) supplied from an air supply passage provided in a support cylinder that supports a center shaft is filled inside a bladder, and an unvulcanized tire is vulcanized.

[0005] However, since the volume of the internal space of the bladder is large, a heat medium that does not contribute to the vulcanization of the unvulcanized tire is filled at high pressure, making it difficult to vulcanize efficiently with a small amount of energy.

[0006] The present invention has been devised in view of the above actual situation, and the main object is to provide a tire vulcanizing apparatus capable of efficiently vulcanizing an unvulcanized tire with a small amount of energy.

Means for Solving the Problems

[0007] The present invention is a tire vulcanizing apparatus, a vulcanizing mold for vulcanizing and molding the outer surface of an unvulcanized tire, a vulcanizing bladder that expands inside the lumen of the unvulcanized tire to press the unvulcanized tire against the vulcanizing mold, A heating device for heating a heat transfer medium, A supply device for supplying the heated heat transfer medium into the vulcanizing bladder, The bladder includes a volume reduction means for reducing the volume of the filling space, which is disposed inside the bladder and filled with the heat transfer medium. [Effects of the Invention]

[0008] Since the tire vulcanization apparatus of the present invention has the above configuration, it is possible to perform vulcanization efficiently. [Brief explanation of the drawing]

[0009] [Figure 1] This is a cross-sectional view showing one embodiment of the tire vulcanization apparatus of the present invention. [Figure 2] Figure 1 is a cross-sectional view of a modified tire vulcanization apparatus. [Figure 3] This is a cross-sectional view of another modified tire vulcanization apparatus shown in Figure 1. [Figure 4] This is a cross-sectional view of yet another modified example of the tire vulcanizing apparatus shown in Figure 1. [Figure 5] This is a cross-sectional view of yet another modified example of the tire vulcanizing apparatus shown in Figure 1. [Modes for carrying out the invention]

[0010] Hereinafter, one embodiment of the present invention will be described with reference to the drawings. It should be understood that the drawings contain exaggerations and representations that differ from the actual dimensional ratios of the structure in order to aid in understanding the content of the invention. Furthermore, the same or common elements are denoted by the same reference numerals throughout each embodiment, and redundant explanations are omitted. Moreover, the specific configurations shown in the embodiments and drawings are for the purpose of understanding the content of the present invention, and the present invention is not limited to the specific configurations shown in the drawings.

[0011] Figure 1 is a cross-sectional view showing the schematic configuration of the tire vulcanization apparatus 100 of this embodiment. The tire vulcanization apparatus 100 includes a vulcanization mold 1, a vulcanization bladder 2, a heating device 3, a supply device 4, and a volume reduction means 5.

[0012] The vulcanizing mold 1 is a mold for vulcanizing the outer surface of an unvulcanized tire T. In this example, the vulcanizing mold 1 comprises a tread mold 11 for forming the tread portion of the tire, upper and lower side molds 12 and 13 for forming the sidewall portion of the tire, and upper and lower bead rings 14 and 15 for forming the bead portion of the tire. The tread mold 11 is divided into multiple sections in the circumferential direction. A molding surface 16 that contacts the outer surface of the unvulcanized tire T is formed on the inner surface of the vulcanizing mold 1.

[0013] The vulcanization mold 1 is not limited to the form illustrated in Figure 1; for example, a so-called two-piece type, which is divided into upper and lower sections, may also be used.

[0014] It is desirable that the vulcanizing mold 1 is configured to be heated using electricity as an energy source. For example, in this embodiment, the vulcanizing mold 1 is heated by an electric heater or the like built into the platen that holds the pusher and side molds 12 and 13, which are arranged on the outer circumference of the tread mold 11. This makes it possible to efficiently heat the vulcanizing mold 1 with a small amount of energy. The heated vulcanizing mold 1 vulcanizes the unvulcanized tire T from the outside.

[0015] The vulcanizing bladder 2 is placed inside the lumen of the unvulcanized tire T. The vulcanizing bladder 2 is formed in a toroidal shape and is supported by a support mechanism 6.

[0016] The vulcanizing bladder 2 has a main body 21 that expands and contracts due to the rise and fall of internal pressure, a support member 22 that supports the upper edge 21U of the main body 21, and a support member 23 that supports the lower edge 21L of the main body 21. The main body 21 is made of an expandable rubber material or the like.

[0017] The support mechanism 6 has a center post 61 to which the support 22 is connected and which is movable up and down, and a cylindrical portion 62 that supports the center post 61. A support 23 is connected to the cylindrical portion 62. The vulcanizing bladder 2 and the support mechanism 6 define a filling space GS filled with the heat medium G.

[0018] The heating device 3 heats the heat medium G. Examples of the heat medium G include inert gases such as nitrogen, argon gas, and helium. Steam (water vapor) may be applied to the heat medium G. The inert gas and steam may be configured to be mixed inside the vulcanizing bladder 2.

[0019] The heating device 3 is preferably configured to heat the heat medium G using electricity as an energy source. For example, the above configuration is realized by the heating device 3 including an electric heater that heats the heat medium G. Thereby, it is possible to efficiently heat the heat medium G with a small amount of energy. Also, when the heat medium G is not being heated, no energy is consumed, so it is possible to more easily improve energy efficiency.

[0020] The supply device 4 includes a compressor or the like for compressing the high-temperature heat medium G and sending it into the vulcanizing bladder 2. Also, a tank for storing the high-temperature and high-pressure heat medium G is used in combination as needed.

[0021] The supply device 4 is connected to the cylindrical portion 62. An air supply passage 65 and an exhaust passage 66 are provided in the cylindrical portion 62. The air supply passage 65 and the exhaust passage 66 of the present embodiment communicate with pipes 57, 58 formed in the volume reduction means 5 described later. The pipes 57, 58 communicate with the filling space GS.

[0022] The supply device 4 supplies the heat medium G heated by the heating device 3 into the vulcanizing bladder 2 through the air supply passage 65 and the pipe 57. Then, the heat medium G after vulcanization is discharged to the outside of the vulcanizing mold 1 through the pipe 58 and the exhaust passage 66.

[0023] When the heated heat transfer medium G is supplied, the main body 21 of the vulcanizing bladder 2 is heated and expands. As the main body 21 expands, it comes into contact with the unvulcanized tire T. As the main body 21 expands further, it presses the unvulcanized tire T against the vulcanizing mold 1.

[0024] Furthermore, the main body 21 of the vulcanizing bladder 2 transfers the heat supplied by the heat transfer medium G to the unvulcanized tire T, thereby vulcanizing the unvulcanized tire T from the inside.

[0025] The volume reduction means 5 is located inside the vulcanizing bladder 2 to reduce the volume of the filling space GS into which the heat transfer medium G is filled. In this embodiment, the volume reduction means 5 is connected to and supported by the cylindrical portion 62, and is located within the filling space GS to function as a spacer.

[0026] Even in conventional tire vulcanizing apparatuses that do not have volume reduction means 5 (see Patent Document 1), the heat transfer medium filled in the region where the support mechanism 6 exists in the radial direction of the mold contributes almost nothing to heat exchange with the vulcanizing bladder 2. For this reason, even if the amount of heat transfer medium G filled in the filling space GS is reduced by arranging the volume reduction means 5 inside the vulcanizing bladder 2, the effect on the vulcanization time and the like is extremely limited.

[0027] The tire vulcanizing apparatus 100 of the present invention, with its configuration including a volume reduction means 5, reduces the amount of heat transfer medium G filled in the filling space GS, making it possible to efficiently vulcanize an unvulcanized tire T with less energy.

[0028] As shown in Figure 1, in the expanded state of the vulcanizing bladder 2, it is desirable that the distance D in the radial direction of the mold between the radial inner surface of the bladder and the volume reduction means 5 be 10 cm or less. Furthermore, it is desirable that the above distance D be 80% or more of the inner diameter (bead reference diameter) of the tire T. By keeping the distance D within the above range, a sufficient reduction in the amount of heat transfer medium G filled in the filling space GS can be obtained, making it possible to efficiently vulcanize the unvulcanized tire T with even less energy.

[0029] Figure 2 is a cross-sectional view of a tire vulcanizing apparatus 100A, which is a modified version of the tire vulcanizing apparatus 100 shown in Figure 1. For parts of the tire vulcanizing apparatus 100A not described below, the configuration of the tire vulcanizing apparatus 100 described above may be adopted.

[0030] In the tire vulcanizing apparatus 100A, an inert gas G1 is used as the heat transfer medium G. The exhaust passage 66 of the cylindrical section 62 is connected to the heating device 3. The heating device 3 recovers the inert gas G1 discharged from the filling space GS, heats it again, and sends it to the supply device 4.

[0031] The supply device 4 supplies the inert gas G1, heated by the heating device 3, back into the filling space GS. In other words, the supply device 4 includes a gas circulation device 41 that circulates the inert gas G1 between the filling space GS of the vulcanizing bladder 2 and the heating device 3.

[0032] In the tire vulcanization apparatus 100, the steam used as the heat transfer medium G releases latent heat when it undergoes a phase transition from gas to liquid, and this is used as part of the heat source for vulcanization. However, in the tire vulcanization apparatus 100A, an inert gas G1 is used as the heat transfer medium G, so the latent heat cannot be used as a heat source for vulcanization. Generally, vulcanization that does not utilize the latent heat of steam as a heat source is a concern because it will result in a longer vulcanization time.

[0033] Therefore, in the tire vulcanization apparatus 100A, the gas circulation device 41 circulates inert gas G1 during the vulcanization process, and the inert gas G1 recovered from the filling space GS is heated by the heating device 3 and supplied to the filling space GS. As a result, the filling space GS is always filled with high-temperature inert gas G1, which is used as a heat source for vulcanization, and the amount of heat absorbed by the vulcanization bladder 2 and the unvulcanized tire T is replenished. Consequently, it is possible to efficiently raise the temperature of the vulcanization bladder 2 and, consequently, the unvulcanized tire T, without using steam, which involves the absorption of latent heat, as a heat transfer medium, and to proceed with vulcanization in a short time.

[0034] Furthermore, the volume reduction means 5 reduces the amount of inert gas G1 filled in the filling space GS, thus reducing the amount of heat required for the heating device 3 to heat the inert gas G1. This makes it possible to vulcanize the unvulcanized tire T efficiently with even less energy.

[0035] Furthermore, in this embodiment, the volume of the filling space GS is reduced by the configuration having the volume reduction means 5, so it is possible to increase the pressure of the filling space GS in a short time.

[0036] In combination with the vulcanizing mold 1 and heating device 3, which use electricity as a thermal energy source, the tire vulcanizing apparatus 100A does not require steam as a heat transfer medium G. This eliminates the need to install piping and other equipment for supplying steam, making it easy to simplify the configuration of the vulcanizing plant.

[0037] As already mentioned, in the tire vulcanization apparatus 100A of this embodiment, the amount of heat absorbed by the unvulcanized tire T is compensated for by circulating high-temperature inert gas G1. Therefore, in order to vulcanize the unvulcanized tire T in a short time, it is desirable that not only is the heating device 3 high-output, but the output of the gas circulation device 41 is also increased.

[0038] The gas circulation device 41 is preferably configured to ventilate the inert gas G1 in the filling space GS within 5 minutes. "Ventilation" means that the inert gas G1 is replaced (substituted) while the pressure in the filling space GS is maintained. More specifically, it is desirable that the volume of inert gas G1 supplied per minute to the filling space GS by the gas circulation device 41 via the air supply channel 65 during the vulcanization of the unvulcanized tire T is 1 / 5 or more of the volume of the filling space GS. This allows the temperature of the unvulcanized tire T to rise rapidly, making it possible to vulcanize the unvulcanized tire T in a short time.

[0039] More preferably, the gas circulation device 41 is configured to ventilate the inert gas G1 in the filling space GS within 3 minutes. This makes it possible to vulcanize the unvulcanized tire T in a shorter time.

[0040] Furthermore, it is desirable that the gas circulation device 41 is configured to circulate inert gas G1 so as to maintain the pressure in the filling space GS at 2.45 MPa or higher. This allows the vulcanizing bladder 2 to press the unvulcanized tire T against the vulcanizing mold 1 with appropriate pressure.

[0041] Figure 3 shows a horizontal cross-section including the equator of tire vulcanizing apparatus 100B, which is a modified version of tire vulcanizing apparatus 100A in Figure 2. For parts of tire vulcanizing apparatus 100B not described below, the configuration of tire vulcanizing apparatus 100A described above may be adopted.

[0042] In the tire vulcanizing apparatus 100B, the volume reduction means 5 has an air supply passage 51 that communicates with the air supply passage 65 of the cylindrical section 62. An outlet 52 is provided at the tip of the air supply passage 51. The outlet 52 is open to the filling space GS. The air supply passage 51 blows the inert gas G1 supplied via the air supply passage 65 into the filling space GS from the outlet 52. The direction of the blowing of the inert gas G1 can be defined by extending the air supply passage 51 from the outlet 52.

[0043] As shown in Figure 3, it is desirable that the nozzle 52 is directed such that the nozzle angle θ of the inert gas G1 relative to the inner surface of the vulcanizing bladder 2 is 60° or less. By having a nozzle angle θ of 60° or less, the inert gas G1 blown from the nozzle 52 is incident at an oblique angle to the inner surface of the vulcanizing bladder 2 and flows circumferentially along the inner surface of the vulcanizing bladder 2. As a result, the inert gas G1 is agitated as it flows circumferentially through the filling space GS. Therefore, stagnation of the inert gas G1 is suppressed, temperature unevenness in the vulcanizing bladder 2 is corrected, and the unvulcanized tire T can be vulcanized uniformly.

[0044] In tire vulcanization apparatuses 100 to 100B, it is desirable that the volume reduction means 5 be configured to expand and contract radially. When filling the filling space GS with inert gas G1, the volume reduction means 5 expands radially (increases in diameter), thereby reducing the amount of heat transfer medium G filled into the filling space GS, making it possible to vulcanize the unvulcanized tire T efficiently with even less energy. On the other hand, after the vulcanization of the unvulcanized tire T is completed, the volume reduction means 5 shrinks radially inward from the bead toe molding surface 17 of the vulcanization mold 1 (reduces in diameter), making it easier to remove the vulcanized tire after vulcanization.

[0045] Figure 4 is a cross-sectional view of tire vulcanizing apparatus 100C, which is another modified example of tire vulcanizing apparatus 100 of Figure 1. For parts of tire vulcanizing apparatus 100C not described below, the configurations of tire vulcanizing apparatuses 100 to 100B described above may be adopted.

[0046] The volume reduction means 5 is preferably composed of a rigid core 50. "Rigid" means, for example, that it has enough rigidity to not deform when subjected to the pressure of the inert gas G1 that fills the filling space GS in the vulcanization process. Such a core 50 can be easily realized by using a metallic material such as a titanium alloy, stainless steel alloy, or aluminum alloy.

[0047] Since the volume reduction means 5 is composed of a core 50, the air supply passage 51 and the outlet 52 can be easily formed. For example, by providing through holes in the core 50, the air supply passage 51 and the outlet 52 can be easily formed. In addition, since the volume reduction means 5 is composed of a core 50, its diameter can be easily expanded or contracted.

[0048] The core 50 is preferably constructed of a solid structure. A solid structure refers to a structure in which cavities through which the heat transfer medium G flows are eliminated, other than the minimum number of pipes that constitute the air supply passage 51, etc. By constructing the core 50 of a solid structure, the force pressing on the core 50 and, consequently, the side mold 12, etc., when the heat transfer medium G is filled into the filling space GS can be reduced.

[0049] In the tire vulcanizing apparatus 100C of this embodiment, a core 50 is employed in which the volume reduction means 5, the support mechanism 6, and the support member 22 are integrated. The support member 23 is fixed to the bead ring 15 and slidably supports the core 50.

[0050] Figure 5 is a cross-sectional view of a tire vulcanizing apparatus 100D, which is yet another modification of the tire vulcanizing apparatus 100 shown in Figure 1. For parts of the tire vulcanizing apparatus 100D not described below, the configurations of the tire vulcanizing apparatuses 100 to 100B described above may be adopted.

[0051] The volume reduction means 5 may include an inner bladder 55. The inner bladder 55 is located inside the vulcanizing bladder 2. The inner bladder 55 is made of the same rubber material as the vulcanizing bladder 2 and has a retractable body portion 56. The upper edge 56U of the body portion 56 is supported by a support 22, and the lower edge 56L is supported by a support 23.

[0052] The filling space GS between the vulcanizing bladder 2 and the inner bladder 55 is filled with a heat transfer medium G heated by the heating device 3.

[0053] Meanwhile, gas is supplied to the inside of the inner bladder 55 from the supply device 7. As a result, the inner bladder 55 expands inside the vulcanizing bladder 2, reducing the volume of the filling space GS into which the heat transfer medium G is filled.

[0054] In the tire vulcanizing apparatus 100D, the cylindrical section 62 is further provided with an air intake passage 67 and an exhaust passage 68. The air intake passage 67 is connected to the supply device 7. The gap between the support member 22 and the support member 23 functions as a passage 24 that connects the air intake passage 67 to the inside of the inner bladder 55 and a passage 26 that connects the inside of the inner bladder 55 to the exhaust passage 68. In addition, the support member 23 has a passage 25 that connects the air intake passage 65 to the filling space GS of the vulcanizing bladder 2 and a passage 27 that connects the exhaust passage 66 to the filling space GS of the vulcanizing bladder 2.

[0055] For example, an inert gas G2 at room temperature is used as the gas supplied by the supply device 7 to the inner bladder 55. "Room temperature" means that it has not been heated by a heating device or the like.

[0056] Since the inert gas G1, which acts as a heated heat transfer medium G, and the vulcanizing bladder 2 are interposed between the inner bladder 55 and the unvulcanized tire T, the inert gas G2 and the unvulcanized tire T are considered to be thermally insulated. As a result, even if the inert gas G2 is not heated, the vulcanization of the unvulcanized tire T will not be inhibited by the inert gas G2. Therefore, the amount of heat transfer medium G that needs to be heated in the vulcanization process is reduced, and it becomes possible to vulcanize the unvulcanized tire T more efficiently with less energy.

[0057] Furthermore, by supplying inert gas G2 from supply device 7 while stopping the supply of inert gas G1 from supply device 4, the inert gas G1 in the filling space GS is adiabatically compressed. This makes it possible to heat the inert gas G1 without using heating device 3, and enables the unvulcanized tire T to be vulcanized more efficiently with even less energy.

[0058] On the other hand, after the vulcanization of the unvulcanized tire T is complete, inert gas G2 is discharged from the exhaust passage 68 which communicates with the filling space GS. As a result, the inner bladder 55 shrinks (reduces diameter) inward in the radial direction of the mold compared to the bead toe molding surface 17 of the vulcanization mold 1. Therefore, the vulcanized tire can be easily removed.

[0059] [Note] The present invention includes the following embodiments.

[0060] [Invention 1] A tire vulcanizing apparatus, A vulcanization mold for vulcanizing the outer surface of an unvulcanized tire, A vulcanizing bladder that expands within the cavity of the unvulcanized tire to press the unvulcanized tire against the vulcanizing mold, A heating device for heating a heat transfer medium, A supply device for supplying the heated heat transfer medium into the vulcanizing bladder, The vulcanizing bladder includes a volume reduction means for reducing the volume of the filling space, which is disposed inside the vulcanizing bladder and filled with the heat transfer medium, Tire vulcanization equipment. [Invention 2] The heat transfer medium is an inert gas. The tire vulcanizing apparatus according to the present invention 1, wherein the supply device includes a gas circulation device for circulating the inert gas between the filling space of the vulcanizing bladder and the heating device. [Invention 3] The tire vulcanizing apparatus according to the present invention, wherein the gas circulation device ventilates the inert gas in the filling space within 5 minutes. [4th Invention] The tire vulcanizing apparatus according to the present invention, wherein the gas circulation device circulates the inert gas so as to maintain the pressure in the filling space at 2.45 MPa or higher. [5th ​​Invention] The tire vulcanizing apparatus according to the present invention, wherein the volume reduction means is provided with a nozzle for blowing the inert gas into the filling space, and the nozzle is directed at an angle of 60° or less with respect to the inner circumferential surface of the vulcanizing bladder. [Claim 6] The tire vulcanizing apparatus according to claim 1, wherein, in the expanded state of the vulcanizing bladder, the distance in the radial direction of the mold between the radial inner surface of the vulcanizing bladder and the volume reduction means is 10 cm or less. [Claim 7] The tire vulcanizing apparatus according to claim 1, wherein the volume reduction means is a rigid core. [Claim 8] The tire vulcanizing apparatus according to claim 7, wherein the core has a solid structure. [Claim 9] The tire vulcanizing apparatus according to claim 1, wherein the volume reduction means is an inner bladder that can expand and contract inside the vulcanizing bladder. [Claim 10] The tire vulcanizing apparatus according to claim 1, wherein the volume reduction means can reduce the diameter inward in the radial direction of the mold from the bead-toe molding surface of the vulcanizing mold. [Claim 11] The tire vulcanizing apparatus according to claim 1, wherein the vulcanizing mold is heated using electricity as an energy source. [Claim 12] The tire vulcanizing apparatus according to claim 1, wherein the heating device heats the heat transfer medium using electricity as an energy source. [Explanation of Symbols]

[0061] 1: Vulcanization mold 2: Vulcanizing bladder 3: Heating device 4: Feeding device 5: Volume reduction means 7: Feeding device 16: Molding surface 17: Bead-toe molding surface 41: Gas circulation device 50: Middle child 52: Air vent 55: Inner bladder 100: Tire vulcanizing machine 100A: Tire vulcanizing machine 100B: Tire vulcanization machine 100C: Tire vulcanization machine 100D: Tire vulcanizing machine D: Distance G: Heat medium G1: Inert gas G2: Inert gas GS:Filled space T: Unvulcanized tires

Claims

1. A tire vulcanizing apparatus, A vulcanization mold for vulcanizing the outer surface of an unvulcanized tire, A vulcanizing bladder that expands within the cavity of the unvulcanized tire to press the unvulcanized tire against the vulcanizing mold, A heating device for heating a heat transfer medium, A supply device for supplying the heated heat transfer medium into the vulcanizing bladder, The vulcanizing bladder includes a volume reduction means for reducing the volume of the filling space, which is disposed inside the vulcanizing bladder and filled with the heat transfer medium, Tire vulcanization equipment.

2. The heat transfer medium is an inert gas. The tire vulcanizing apparatus according to claim 1, wherein the supply device includes a gas circulation device for circulating the inert gas between the filling space of the vulcanizing bladder and the heating device.

3. The tire vulcanizing apparatus according to claim 2, wherein the gas circulation device ventilates the inert gas in the filling space within 5 minutes.

4. The tire vulcanizing apparatus according to claim 2, wherein the gas circulation device circulates the inert gas so as to maintain the pressure in the filling space at 2.45 MPa or higher.

5. The tire vulcanizing apparatus according to claim 2, wherein the volume reduction means is provided with a nozzle for blowing the inert gas into the filling space, and the nozzle is directed at an angle of 60° or less with respect to the inner circumferential surface of the vulcanizing bladder.

6. The tire vulcanizing apparatus according to claim 1, wherein, in the expanded state of the vulcanizing bladder, the distance in the radial direction of the mold between the radial inner surface of the vulcanizing bladder and the volume reduction means is 10 cm or less.

7. The tire vulcanizing apparatus according to claim 1, wherein the volume reduction means is a rigid core.

8. The tire vulcanizing apparatus according to claim 7, wherein the core has a solid structure.

9. The tire vulcanizing apparatus according to claim 1, wherein the volume reduction means is an inner bladder that can expand and contract inside the vulcanizing bladder.

10. The tire vulcanizing apparatus according to claim 1, wherein the volume reduction means can reduce the diameter inward in the radial direction of the mold from the bead-toe molding surface of the vulcanizing mold.

11. The tire vulcanizing apparatus according to claim 1, wherein the vulcanizing mold is heated using electricity as an energy source.

12. The tire vulcanizing apparatus according to claim 1, wherein the heating device heats the heat transfer medium using electricity as an energy source.

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