JP6383615B2 - Vulcanization can and tire manufacturing method - Google Patents

Description

  The present invention relates to a vulcanization can suitably used for vulcanization molding of a tire, and more particularly to a vulcanization can capable of uniforming an internal temperature distribution and a method of manufacturing a tire using the vulcanization can. .

  2. Description of the Related Art In recent years, a process using a vulcanized can is known as one process for manufacturing a tire called a retread tire. In this process, the base tire that is the basis of the tire and the tread rubber that is stuck in the circumferential direction of the base tire are accommodated in the envelope, and the pressure in the envelope is reduced, and then placed in the vulcanization can This is a step of vulcanizing the cushion rubber as an adhesive layer interposed between the base tire and the tread rubber, and firmly integrating the two. As shown in the patent document, a vulcanizing can is roughly provided in a cylindrical pressure vessel capable of storing a plurality of sets of tires (base tires and tread rubber) accommodated in an envelope, and one of the pressure vessels in the extending direction. A heat source that heats the air in the pressure vessel, a fan that is disposed in the vicinity of the heat source and circulates the air heated by the heat source, and that can be opened and closed on the other end side in the extending direction of the pressure vessel. It has an airtight door. Further, a blower duct extending along the extension direction of the pressure vessel is disposed on the inner wall surface of the pressure vessel, and the air heated by the heat source is supplied into the blower duct by a fan and passes through the blower duct. Is discharged on the side of the airtight door provided on the side opposite to the fan. The direction of travel of the air discharged on the side of the hermetic chamber is reversed by the end plate formed on the hermetic door, and proceeds toward one side of the pressure vessel. And in the said vulcanizing can, in order to prevent the variation in the temperature distribution of the pressure vessel in the vertical direction caused by the air discharged from the blower duct staying in the pressure vessel, The structure which arrange | positions a fin and makes the air discharged | emitted from the said ventilation duct turn into the swirl flow swirling along the circumferential direction of a pressure vessel, and prevents the residence of air and thereby eases variation in temperature distribution Is disclosed.

International Publication No. 2013/011934

However, as shown in FIG. 7, in the vulcanizing can having the above-described configuration, when the wind speed in the extending direction of the pressure vessel of the swirling flow traveling in the pressure vessel was verified, one side and the other side in the extending direction of the pressure vessel Thus, it has been found that there is a large difference in the wind speed, and the difference in the wind speed appears as a variation in temperature distribution on one side and the other side in the extending direction of the pressure vessel.
And when the cause of the above wind speed difference was further verified, as a first factor, the fins arranged as a configuration generating a swirl flow become the resistance of the air discharged from the air duct, and the factor that lowers the initial wind speed It has become. As a second factor, the swirl flow traveling to one side of the pressure vessel is obstructed by the tire stored in the pressure region, and the wind speed of the swirl flow suddenly stalls near the center in the extension direction of the pressure vessel. It was.
The present invention has been made to solve the above-mentioned problems, and by reducing the difference in the wind speed of the swirling flow generated in the extension direction of the pressure vessel, the temperature distribution is prevented from being varied and the temperature of the entire pressure vessel is made uniform. The present invention provides a vulcanizing can that can be used and a method for manufacturing a tire using the vulcanizing can.

As a configuration related to the vulcanizing can for solving the above-mentioned problems, an air delivery means installed on one end side of a cylindrical pressure vessel, a heat source for heating the air delivered by the air delivery means, and the inside of the pressure vessel A blower duct that extends along the extending direction of the pressure vessel on the wall surface and discharges the air sent out by the air sending means from the discharge port on the other end side inside the pressure vessel, is provided at the discharge port, and is discharged. Fins that make the direction of the air along the circumferential direction of the pressure vessel, and an end plate that is provided on the other end side of the pressure vessel and converts the flow of air discharged from the discharge port to the flow toward one end side of the pressure vessel And having a reduced diameter portion that decreases in diameter as it goes from the discharge port toward the end plate, on the other end side of the pressure vessel, radially inward of the air duct, and with respect to the air duct A collection provided with a gap It was configured to include the duct.
According to this configuration, the swirl flow converted into the flow toward the one end side of the pressure vessel by the end plate has the reduced diameter portion that decreases in diameter toward the end plate from the discharge port, and the blower duct on the other end side of the pressure vessel Since it proceeds from one side of the pressure vessel to the one end side of the pressure vessel from the inside of the air duct and between the air duct and the air duct that is provided with a gap with respect to the air duct, By reducing the cross-sectional area of the diameter portion and the air duct, the wind speed of the swirling flow can be increased, and the temperature distribution inside the pressure vessel can be made uniform.
Further, as another configuration relating to the vulcanization can, a configuration in which an air passage that opens at one end side and the other end side of the pressure vessel and whose cross-sectional area decreases from the one end side to the other end side is provided in the air collecting duct. did.
According to this configuration, the air flows from the one end side of the pressure vessel to the other end side of the pressure vessel where the swirling flow is generated via the ventilation path, so that the flow rate of the swirling flow is increased. Moreover, since the cross-sectional area of the air passage decreases from one end side to the other end side, the wind speed of the incoming air increases and the wind speed of the swirl flow increases.
Further, as another configuration relating to the vulcanizing can, the air collecting duct has a flat portion that is connected to the reduced diameter portion on the other end side and extends in a radial direction of a part of the air duct and the pressure vessel. In the flat part, the cross-sectional area between the air duct and the inner wall surface in the overlapping region facing part of the air duct in the radial direction of the pressure vessel is the radial direction of the inner wall surface and the pressure vessel in the flat part. The cross-sectional area between the air ducts in the non-overlapping regions facing each other and the cross-sectional area between the reduced diameter portion and the inner wall surface are smaller.
According to this configuration, the wind speed of the swirling flow can be maximized in the overlapping region facing the part of the air duct in the flat portion and the radial direction of the pressure vessel.
Further, if a tire is manufactured on the premise of the structure of the vulcanizing can, a uniform quality tire can be obtained regardless of the position in the pressure vessel by making the temperature distribution inside the pressure vessel uniform.

It is the schematic which shows the internal structure of a vulcanization can. It is a front view showing a plurality of ventilation ducts. It is a perspective view of a ventilation duct. It is a schematic sectional drawing of a wind collection duct. It is a simulation result which shows the wind speed in the vulcanization can which concerns on embodiment. 1 is an exploded perspective view and a cross-sectional view in the width direction of a tire. It is a simulation result which shows the wind speed in the conventional vulcanization can.

[About the outline of vulcanized cans]
Hereinafter, the configuration of the vulcanizing can 1 according to the embodiment will be described with reference to FIGS. 1 to 4. In FIG. 1, a vulcanizing can 1 is formed in a cylindrical shape with one end closed, and is provided in a cylindrical pressure vessel 2 in which a plurality of tires 10 can be stored, and at the other end of the pressure vessel 2 so as to be openable and closable. The airtight door 3 is provided. The peripheral wall portion constituting the pressure vessel 2 is lined with a heat insulating material or the like outside the figure without any gap along the extending direction (axial direction) and the circumferential direction. Inside the pressure vessel 2 is formed a vulcanization region R1 in which a plurality of tires 10 can be stored and vulcanized. The hermetic door 3 is a door that can be freely opened and closed at the other open end of the pressure vessel 2, and is arranged coaxially with the cylindrical pressure vessel 2. The hermetic door 3 closes the opening on the other end side of the pressure vessel 2 through a sealing material (not shown) disposed around the air door 3 so that the air supplied into the pressure vessel 2 leaks to the outside. To prevent. That is, the pressure vessel 2 whose one end is closed is maintained as a sealed space by closing the airtight door 3 on the other end. A wall surface 3A facing the vulcanization region R1 side of the airtight door 3 is formed as a so-called end plate, and is recessed into a spherical shape with a predetermined curvature. Note that the center of the wall surface 3A formed as the end plate is located coaxially with the center of the pressure vessel 2 and the air collecting duct 30 described later. Below the lower half of the cylindrical pressure vessel 2, a floor plate (not shown) extending along the extending direction of the pressure vessel 2 is laid, and a plurality of tires 10 are carried into the pressure vessel 2. At this time, a plurality of tires are carried from the open / close end side where the airtight door 3 is provided to the closed end side using a cart or the like that can travel on the floor plate, and are sequentially suspended from the hooks 11 provided in the pressure vessel 2. The plurality of tires 10 are stored side by side along the extending direction of the pressure vessel 2.

[Tire composition]
Here, the tire 10 stored in the vulcanizing can 1 will be outlined. FIG. 6 is an exploded perspective view and a cross-sectional view in the width direction showing an unvulcanized retread tire as an example of the tire 10 vulcanized by the vulcanizing can 1. As shown in the figure, the tire 10 includes a base tire Tb as a base, a cushion rubber 12 attached to a circumferential surface of the base tire Tb, and a circumference of the base tire Tb via the cushion rubber 12. The tread rubber 13 is wound around the directional surface. As shown in FIG. 6B, the base tire Tb includes a pair of bead portions 11A made of a member such as an annular steel cord, a side portion 11B and a crown extending in a toroidal shape so as to straddle the pair of bead portions 11A. Part 11C. A plurality of belts are stacked along the radial direction inside the crown portion 11C. The base tire Tb is manufactured, for example, by cutting (buffing) a tread portion of a used tire, or by vulcanization by a mold having a mold that does not have unevenness corresponding to the tread pattern on the surface. . Moreover, the vulcanization degree of the base tire Tb may be in a state equal to or lower than the vulcanization degree required for the product tire.

  The cushion rubber 12 is an unvulcanized rubber having substantially the same composition as the base tire Tb and the tread rubber 13, and is vulcanized by the vulcanizing can 1 so that the base tire Tb and the tread rubber 13 are integrated. Functions as an adhesive layer. The tread rubber 13 is a belt having a length corresponding to the circumferential length of the base tire Tb, and is vulcanized in a state of being wound around the crown portion 11C of the base tire Tb. It is a member. The belt-like tread rubber 13 is produced, for example, by vulcanizing with a press-type vulcanizing device in which unevenness corresponding to a desired tread pattern is formed on one mold. Further, the belt-shaped tread rubber 13 obtained by the press-type vulcanizer is wound along the circumferential surface of the base tire Tb on which the cushion rubber 12 is adhered, and the ends are joined together. It is preliminarily integrated with the base tire Tb.

  The tire 10 having the above-described configuration is accommodated in an unillustrated bag called an envelope, and is suspended in the pressure vessel 2 via a hook 11. The pressure in the envelope is reduced to atmospheric pressure or less, and the inner surface of the envelope is in close contact with the outer surface of the tread rubber 13. That is, when the tire 10 is accommodated in the envelope, the tread rubber 13 is maintained in a state of being pressed against the circumferential surface of the base tire Tb. Note that, as an example of the tire 10 stored in the pressure vessel 2, the retread tire including the vulcanized base tire Tb and the vulcanized tread rubber 13 has been described. The tire 10 is not limited to the above-described configuration, and may be any tire as long as the manufacturing process includes a vulcanization step.

[Air delivery area]
Returning to FIG. 1, the structure of the pressure vessel 2 will be described again. An air delivery region R2 is formed on the closed end side, which is one end side in the pressure vessel 2. Air delivery area | region R2 is an area | region divided by the partition 7 which partitions off the vulcanization | cure area | region R1. In the air delivery region R2, a fan 6 is installed as delivery means for delivering air circulating in the vulcanization region R1. The fan 6 includes a rotating blade 6B that rotates by driving of the motor 6A. The air in the vulcanization region R1 is taken into the air delivery region R2 through the air inlet formed in the partition wall 7, and the air is taken in. The air is compressed and sent out to the intake port 9A side of the air duct 8 described later.

[Blower duct]
As shown in FIG. 1, the air duct 8 (8A; 8B; 8C; 8D) passes through the vulcanization region R1 from the air delivery region R2 along the extending direction of the inner peripheral wall surface 2A of the pressure vessel 2, and the hermetic door 3 Extend to the side. As shown in FIG. 2, the air ducts 8 </ b>A; 8 </ b>B; 8 </ b>C; 8 </ b> D are disposed with a predetermined interval in the circumferential direction with respect to the inner peripheral wall surface 2 </ b> A of the pressure vessel 2. More specifically, a set of air ducts 8A; 8B is disposed on the upper side of the inner peripheral wall surface 2A of the pressure vessel 2, and the air ducts 8C; 8D are disposed on the lower side of the inner peripheral wall surface 2A of the pressure vessel 2. A set is arranged. In each set, the air duct 8A and the air duct 8B, and the air duct 8C and the air duct 8D are disposed at symmetrical positions when the cylindrical pressure vessel 2 is viewed from the front. Further, in the inner peripheral wall surface 2A, the air duct 8A and the air duct 8C, and the air duct 8B and the air duct 8D are disposed to face each other. As shown also in FIG. 2, the air ducts 8A; 8B; 8C; 8D are a pair of plate pieces 28; 28 that rise from the inner peripheral wall surface 2A of the pressure vessel 2 relative to the inner side in the radial direction, and the plate pieces 28; 28 is a tubular body composed of a bottom plate 29 that connects the radially inner ends of 28 and curves so as to face the inner peripheral wall surface 2A of the pressure vessel 2. The number of the air ducts 8 and the positional relationship with respect to the inner peripheral wall surface 2A are not limited to those shown in the drawing.

  As shown in FIG. 1, the intake port 9A formed at one end in the extending direction of the air ducts 8A; 8B; 8C; 8D having the above-described configuration communicates with the air delivery region R2. In addition, a discharge port 9B that opens immediately before the wall surface 3A of the hermetic door 3 is provided at the other end in the extending direction of the air ducts 8A; 8B; 8C; 8D. The air is discharged toward the wall surface 3 </ b> A from the discharge port 9 </ b> B opened immediately before the wall surface 3 </ b> A of the hermetic door 3.

  As shown in FIG. 1, a heat source 5 made of, for example, an electric heater is disposed in the air duct 8. Therefore, the air taken in from the intake port 9A of each air duct 8 is heated by the heat source 5 in the flow path leading to the exhaust port 9B, and is discharged from the exhaust port 9B.

[Fin configuration]
As shown in FIGS. 2 and 3, a plurality of fins 21 to 25 for restricting the air discharge direction are provided in the discharge port 9 </ b> B formed on the other end side in the extending direction of the air duct 8. As specifically shown in FIG. 3, the fins 21 to 25 are plate bodies extending along the extending direction of the air duct 8, and in the vicinity of the discharge port 9B, one of the circumferential directions of the pressure vessel 2 (arrow X1). Curve to the side. More specifically, the curvature is increased in the order from the fin 21 to the fin 25. Note that the shapes of the fins 21 to 25 are not limited to this, and for example, all the fins may have the same curvature, or a straight plate may be inclined in the same direction.

  As shown in FIGS. 2 and 3, the direction of all the fins 21 to 25 formed in the discharge port 9 </ b> B in each of the air ducts 8 </ b> A; 8 </ b> B; 8 </ b> C; 8 </ b> D is one of the circumferential directions of the cylindrical pressure vessel 2. It is unified to become the side. Therefore, the air discharged from each discharge port 9B to the wall surface 3A side of the hermetic door 3 generates a flow of air rotating in the circumferential direction along the inner peripheral wall surface 2A of the pressure vessel 2, that is, a swirling flow. The direction of the swirling flow from each discharge port 9B toward the hermetic door 3 is reversed by the wall surface 3A formed as an end plate, and becomes a flow toward one end of the pressure vessel 2, that is, toward the partition wall 7, It proceeds in the vulcanization region R1 of the container 2. The tire 10 stored in the vulcanization region R1 is gradually heated by convection heat transfer due to the swirling flow traveling through the vulcanization region R1, and vulcanization proceeds.

  As described above, the air compressed in the air delivery region R <b> 2 on one end side of the pressure vessel 2 is heated by the heat source 5 disposed in the blower duct 8, and the discharge port provided on the other end side of the pressure vessel 2. It is discharged to the airtight door 3 side from 9B. The discharge direction of the air discharged from the discharge port 9 </ b> B is restricted by the plurality of fins 21 to 25, thereby generating a swirl flow that is a flow of air along the circumferential direction of the pressure vessel 2. Based on the above, the air collection duct 30 provided in the pressure vessel 2 will be described in detail.

[About air collection duct]
As shown in FIGS. 1 and 4, the air collecting duct 30 is located on the other end side of the pressure vessel 2 radially inward from the plurality of air ducts 8 disposed on the inner peripheral wall surface 2 </ b> A of the pressure vessel 2. It is the cylindrical body of the both ends opening provided. The air collecting duct 30 includes a flat portion 32 extending linearly from one end side to the other end side of the pressure vessel 2, and the other end side of the pressure vessel 2 from the flat portion 32, in other words, the airtight door 3 side. A diameter-reducing portion 34 that gradually decreases in diameter is formed, and an air passage K that is a space corresponding to the cross-sectional shape of the flat portion 32 and the reduced-diameter portion 34 is formed on the inner peripheral side thereof. When viewed in the extending direction, the flat portion 32 has an overlapping region P1 that overlaps with a part of the bottom plate 29 of the air duct 8 that is located radially outward, and an inner peripheral wall surface of the pressure vessel 2 without overlapping the bottom plate 29. 2A and a non-overlapping region P2 facing the 2A. As shown in FIG. 2, when the air collecting duct 30 is viewed in the circumferential direction, between the overlapping region P1 of the flat portion 32 and the bottom plate 29, or between the flat portion 32 and the inner peripheral wall surface 2A, respectively. Nozzle regions R4 and R5 are formed which serve as entrances of the swirl flow generated on the airtight door 3 side to the vulcanization region R1 side. As shown in the figure, in the present embodiment, since the air duct 8 is provided at two locations vertically apart along the circumferential direction of the pressure vessel 2, the nozzle regions R4; R5 are also circumferentially arranged. Are formed alternately. The function of the nozzle region R4; R5 will be described later.

  The reduced diameter portion 34 is a region that gradually inwards in the radial direction as it goes from one end side to the other end side of the pressure vessel 2 while facing the inner peripheral wall surface 2 </ b> A of the pressure vessel 2. Due to the shape of the diameter-reduced portion 34, the cross-sectional area of the reduced-diameter region K <b> 1 that is a part of the air passage K decreases from one end side to the other end side, and is established at the other end portion of the reduced-diameter portion 34. It becomes the narrowest at the outlet 38.

Next, with reference to FIG. 2, FIG. 4, the effect | action produced by the air collection duct 30 which consists of the said structure is demonstrated. In the following description, the range on the other end side of the pressure vessel 2 from the one end portion of the air collecting duct 30 will be described as the swirl flow generation region R3. As described above, when the swirling flow is continuously generated in the swirling flow generation region R3 by the air discharged from the blower duct 8 and proceeds toward the vulcanization region R1, the vicinity of the center (axial center) of the pressure vessel 2 is reached. Air, in other words, air near the center of the vulcanization region R1 is taken in from the intake 36 formed at one end of the air collecting duct 30 as indicated by arrows Y1 to Y3. The flow discharged from the blowout port 38 formed at the other end portion is generated. Further, since the flow path cross-sectional area of the reduced diameter region K1 of the air collecting duct 30 gradually decreases with the air outlet 38 as a minimum, the air velocity of the air passing through the air collecting duct 30 becomes maximum at the air outlet 38, and the airtightness is increased. It will blow out to the door 3 side.
The swirl flow generated in the swirl flow generation region R3 is one end side of the pressure vessel 2, that is, in the nozzle region R4; R5 direction, with the flow rate and the wind speed increased by the air taken in from the vulcanization region R1 side. Proceed to.

  In this way, the air on the vulcanization region R1 side is taken into the swirl flow generation region R3 side while increasing the flow velocity via the air passage K formed on the inner peripheral side of the air collecting duct 30, and thereby the swirl flow A high-pressure and high-speed swirling flow is generated in the generation region R3.

Further, the swirl flow in the swirl flow generation region R3 proceeds to the vulcanization region R1 side via a plurality of nozzle regions R4; R5 formed on the outer peripheral side of the air collecting duct 30. Here, as shown in FIGS. 2 and 4, when the cross section of the flow path in the swirl flow generation region R3 is viewed along the direction of travel of the swirl flow, the reduced diameter portion 34 of the air collecting duct 30 extends from the airtight door 3 to the nozzle region R4. ; Since the diameter is increased toward the R5 direction, the cross-sectional area of the flow path between the outer peripheral surface of the reduced diameter portion 34 and the inner peripheral wall surface 2A gradually decreases, and relates to the range of the overlapping region P1 of the flat portion 32 It is the minimum between the outer peripheral surface and the bottom plate 29. That is, when the swirl flow generation region R3 is viewed along the traveling direction of the swirl flow, the flow path cross-sectional area through which the swirl flow passes decreases in the nozzle region R4; R5 direction.
More specifically, the flow path cross-sectional area of the swirl flow generation region R3 is minimized in the range of the overlapping region P1 of the flat portion 32 forming the nozzle region R4; R5, and then the range of the non-overlapping region P2 of the flat portion 32, The reduced diameter portion 34 and the inner peripheral wall surface 2 </ b> A increase in the order in which they face each other.

Therefore, the wind speed along the extension direction of the pressure vessel 2 of the swirl flow generated in the swirl flow generation region R3 increases as it advances in the nozzle region R4; R5 direction, and reaches the maximum when entering the nozzle region R4; R5. Become. Therefore, the swirl flow that travels from the end of the nozzle region R4; R5, in other words, from one end of the outer peripheral surface of the air collecting duct 30 into the vulcanization region R1, passes through the vulcanization region R1 while maintaining a high initial wind speed. It blows through and proceeds in the direction of the partition wall 7.
Further, since the maximum diameter L1 of the air collecting duct 30, that is, the diameter of the flat portion 32 is set larger than the diameter of the tire 10 stored in the vulcanization region R1, the nozzle region R4; The swirl flow that travels toward the vulcanization region R1 via the travel proceeds in the direction of the partition wall 7 without being blocked by the tire 10 itself.
As described above, the swirl flow is vigorously flowed into the vulcanization region R1 through the swirl flow generation region R3 formed on the outer peripheral side of the wind collection duct 30 and the flow passage cross-sectional area gradually decreases. Is set to be larger than the diameter of the tire 10 stored in the vulcanized region R1, and the positions of the nozzle regions R4; R5 are positioned radially outside the peripheral surface of the tire 10. Therefore, the swirling flow from the nozzle region R4; R5 toward the partition wall 7 is not obstructed by the tire 10, so that the flow velocity of the swirling flow until reaching one end of the pressure vessel 2, in other words, the partition wall 7, is almost attenuated. Accordingly, the tire 10 stored in the vulcanization region R1 can be effectively suppressed in the extension direction of the pressure vessel 2, in other words, the variation in temperature generated in the extension direction of the vulcanization region R1 can be effectively suppressed. Granted to Heat it is possible to equalize the that.
Then, the amount of heat applied to the tire 10 is made uniform regardless of the position in the extending direction of the vulcanizing region R1, so that when the vulcanization by the vulcanizing can 1 is completed, a uniform quality tire is vulcanized once. Can be obtained.

FIG. 5 is a diagram showing a simulation result of the wind speed distribution in the extending direction of the vulcanizing can 1 according to the present embodiment. In comparison with FIG. 7, in the vulcanizing can 1 according to the present embodiment, in addition to the vulcanizing can 1 in which the swirling flow keeps its shape (trajectory) in the vulcanizing region R <b> 1 and the swirling flow proceeds. It can be seen that the wind speed hardly decreases from the end to the one end. That is, according to the simulation result, in the vulcanizing can 1 according to this embodiment, the flow velocity of the swirling flow that proceeds from the nozzle region R4; R5 toward the partition wall 7 side is maintained without stalling in the extension direction. It was confirmed that
As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the said embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made to the above-described embodiment, and it is obvious that such changes and modifications can be included in the technical scope of the present invention. It is clear from the description.
For example, as shown in FIG. 4, it is good also as a structure which provided the baffle plate 40 which further reduces a flow-path cross-sectional area in nozzle area | region R4; R5. The rectifying plate 40 is a plate body that extends radially inward from the bottom plate 29 of the air duct 8 and the inner peripheral wall surface 2A of the pressure vessel 2, and is inclined or curved in the direction of the vulcanization region R1. By providing the rectifying plate 40, the cross-sectional area of the flow path in the nozzle region R4; R5 is further reduced, so that the wind speed of the swirling flow can be further increased. Further, if the extension dimension of the rectifying plate 40 in the nozzle region R5 is set longer than the extension dimension of the rectifying plate 40 provided in the nozzle region R4 and the distance between them is the same, the circumferential direction of the pressure vessel 2 is increased. Nozzle regions R4 and R5 having the same flow path cross-sectional area can be formed along this, and the wind speed of the swirling flow can be further increased.

1 vulcanized can, 2 pressure vessel, 2A inner wall surface, 3 airtight door, 3A wall surface, 5 heat source,
6 Fan, 7 Bulkhead, 8 (8A-8D) Air duct, 9A Intake port,
9B discharge port, 10 tires, 21-25 fins, 28 plate pieces, 29 bottom plate,
30 air collecting duct, 32 flat part, 34 reduced diameter part, 40 current plate

Claims (4)

An air delivery means installed at one end of the cylindrical pressure vessel;
A heat source for heating the air delivered by the air delivery means;
An air duct extending along the extending direction of the pressure vessel on the inner wall surface of the pressure vessel, and discharging the air sent out by the air sending means from a discharge port on the other end side inside the pressure vessel;
A fin provided at the discharge port and having a direction of the discharged air along a circumferential direction of the pressure vessel;
An end plate that is provided on the other end of the pressure vessel and converts the flow of air discharged from the discharge port into a flow toward one end of the pressure vessel;
A vulcanizing can with
It has a reduced diameter portion that decreases in diameter as it goes from the discharge port toward the end plate, and is provided on the other end side of the pressure vessel in the radial direction from the air duct and with a gap with respect to the air duct. A vulcanizing can characterized by having a wind collecting duct.   2. The air duct according to claim 1, wherein an air passage opening at one end side and the other end side of the pressure vessel and having a cross-sectional area decreasing from the one end side to the other end side is formed in the air collecting duct. Vulcanized can.   The air collecting duct has a flat portion that is connected to the reduced diameter portion on the other end side, and extends to face a part of the blower duct in the radial direction of the pressure vessel. A cross-sectional area between the air duct and the inner wall surface in an overlapping region facing a part of the pressure vessel in the radial direction of the pressure vessel is opposed to the inner wall surface in the radial direction of the pressure vessel in the flat portion. The vulcanizing can according to claim 1 or 2, wherein the vulcanizing can is smaller than a cross-sectional area between the blower duct and a cross-sectional area between the reduced diameter portion and the inner wall surface in a non-overlapping region. The air heated by the heat source is sent out by the air sending means installed on one end side of the cylindrical pressure vessel,
The discharged air is discharged from the outlet on the other end side of the pressure vessel of the air duct extending along the extending direction of the pressure vessel on the inner wall surface of the pressure vessel,
The flow of air discharged from the discharge port by the end plate provided on the other end side of the pressure vessel is converted into a flow toward the one end side of the pressure vessel,
A tire manufacturing method for vulcanizing a tire stored in the pressure vessel,
A fin is provided at the discharge port, and a swirling flow is generated with the direction of the air discharged from the discharge port as a direction along the circumferential direction of the pressure vessel,
A wind collecting duct having a reduced diameter portion that reduces the swirling flow diameter toward the end plate from the discharge port, and disposed on the radially inner side of the air blowing duct on the other end side of the pressure vessel; A tire manufacturing method, which proceeds from a gap with a duct.