JP2898668B2 - Gas cycle vulcanizer for bladderless tire vulcanizer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a gas recirculation device for a bladderless tire vulcanizer.

(Prior Art) When vulcanizing a green tire, a closed space is formed in the green tire without using a bladder, and the hot gas in the closed space is directly applied to the green tire to perform vulcanization molding. The bladderless tire vulcanizing machine is disclosed in
No. 89348, and the like.

However, since this tire vulcanizer employs a heating means such as a heater in a narrow enclosed space and heats an inert gas such as CO ₂ and N ₂ by this heating means, there are various structural considerations. In addition to the problem described above, in addition to heat transfer by hot gas, radiant heat from the heating means spreads to the green tire,
There was a problem that a local overvulcanization phenomenon occurred.

Therefore, a heating circuit is provided outside the split mold, and a circulation circuit is configured to continuously supply and circulate the hot gas heated by the heating means into the closed space via the supply / discharge pipe line. Is considered to provide a stirring means such as a small propeller and to stir the circulating hot gas in the closed space by the stirring means.

(Problems to be Solved by the Invention) Since the latter tire vulcanizer has only a stirring means in a closed space, there is an advantage that the problem of the conventional tire vulcanizer can be solved.

However, also in this tire vulcanizer, it is necessary to incorporate an opening / closing mechanism for opening and closing the bead pressing plate of the central mechanism in a narrow enclosed space. And it is difficult to incorporate them efficiently.

On the other hand, since the gas body has a small heat capacity, in order to increase the heat transfer coefficient between the hot gas and the tire inner surface (green tire), it is indispensable to agitate or reflux the hot gas in the closed space.

The present invention solves such contradictory problems at the same time, and without a stirrer provided in a closed space, uniformly circulates and stirs the hot gas on the inner surface of the green tire to prevent bladderless tires from locally over-curing. An object of the present invention is to provide a gas reflux device for a sulfurizer.

(Means for Solving the Problems) The present invention comprises an upper / lower center mechanism 16, 17 and a green tire 6 is loaded into an openable / closable mold 1, and a sealed space 15 inside the green tire 6 is provided. In a bladderless tire vulcanizer that supplies hot gas to perform vulcanization molding,
Near the bead presser plates 13, 14 of the upper and lower center mechanisms 16, 17,
Hot gas outlets 28 and 29 for emitting hot gas radially are provided along the inner surface shape of the green tire 6, and the central mechanisms 16 and 17 are provided.
A hot gas recovery port 36 for recovering the hot gas in the sealed space 15 to the outside is provided at the center of the space.

(Operation) At the time of vulcanization molding, green tire 6
The hot gas is released into the closed space 15 radially along the inner surface of the heat sink. Then, the hot gas uniformly recirculates from above and below along the inner surface shape of the green tire 6, and then collides at the central portion in the tire width direction, thereby being stirred. And enclosed space 15
The hot gas inside is recovered from the recovery port 36 to the outside.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a split mold which can be opened and closed up and down. The split mold includes an upper mold 2 and a lower mold 3. The upper mold 2 has an upper platen 4 which can be moved up and down, and a lower mold. The dies 3 are each mounted on a fixed lower platen 5. Reference numeral 6 denotes a green tire, which is inserted between the upper and lower molds 2 and 3 of the split mold 1. The green tire 6 has upper and lower bead portions 7,8, and the respective bead portions 7,8 face upper and lower bead rings 11,12 fixed to the upper and lower cylinders 9,10 and oppose the same. The upper and lower bead press plates 13 and 14 are sandwiched from above and below, respectively, so that a sealed space 15 is formed inside the green tire 6. Cylindrical bodies 9,10, bead rings 11,12, bead presser plates 13,14
These constitute the upper and lower center mechanisms 16 and 17.
The bead holding plates 13 and 14 are divided into a plurality of parts in the circumferential direction, and are supported by upper and lower support disks 18 and 19 so as to be openable and closable in the radial direction. It can be opened and closed between the solid line position and the dotted line position via the plates 22 and 23.

Disc-shaped upper and lower guide plates 24 and 25 are provided at upper and lower center mechanisms 16 and 17 at opposite ends thereof, respectively.
14 and are bolted to the upper and lower support disks 18, 19 and the like with a slight gap therebetween. The upper and lower guide plates 24 and 25 are provided at their outer peripheral edges with bent portions 26 and 27 that are bent obliquely toward the upper and lower bead press plates 13 and 14.
The gap between the bent portions 26, 27 on the peripheral edges of the lower guide plates 24, 25 and the upper and lower bead pressing plates 13, 14 forms a hot gas that sends out hot gas into the enclosed space 15 along the inner surface of the green tire 6. Outlet 28,2
It is 9. A number of gas passages 30, 31 penetrating vertically are formed at equal intervals in the circumferential direction in the upper and lower support disks 18, 19 and the like, and the gas passages 30, 31 are formed in the upper and lower cylinders 9, 10. Through annular passages 32 and 33, they communicate with gas supply pipes 34 and 35 provided in the upper and lower cylinders 9 and 10, respectively.

At the center of the lower center mechanism 17, the hot gas recovery port at the upper end
A collection pipe 37 is provided so that 36 opens into the closed space 15. Note that the upper end of the recovery pipe 37 is sealed with an O-ring or the like so that the hot gas is not sent to the outside.

FIG. 3 shows a hot gas system. Reference numeral 38 denotes a pump for circulating the hot gas. A heating device such as a heater for heating the inert gas into a hot gas is supplied to a discharge side pipe 39 of the pump 38. Means 40 are interposed, and gas supply pipes 34, 35 of each tire vulcanizer are connected via on-off valves 41, 42. Further, a suction pipe 43 of the pump 38 is connected to an inert gas source 45 via a check valve 44, and a recovery pipe 37 of each tire vulcanizer is connected via an on-off valve 46. 47 is a relief valve, 48 is an on-off valve, and 49 is an on-off valve for opening to the atmosphere.

When vulcanizing and molding the green tire 6 loaded in the split mold 1, first, an inert gas such as CO ₂ or N ₂ is heated by the heating means 40, and the hot gas is supplied from the supply pipes 34 and 35. Passages 32, 33, 30, 3
The air is fed to the upper and lower guide plates 24 and 25 through 1 and is guided into the upper and lower guide plates 24 and 25 and discharged from the discharge ports 28 and 29 at the peripheral edge into the closed space 15 inside the green tire 6. Then supply. Then, since the hot gas is radially discharged from the vicinity of the bead portions 7 and 8 of the green tire 6 by the guiding action of the bent portions 26 and 27, the hot gas flows along the inner surface of the green tire 6 in the closed space 15 and furthermore, the tire width A hot gas from above and below collides on the center side in the direction to generate a stirring action. Accordingly, the hot gas is uniformly circulated and stirred along the inner surface shape of the green tire 6 to improve the heat transfer coefficient of the hot gas to the inner wall surface of the green tire 6 and reduce local over-vulcanization. It can be uniformly vulcanized without inviting.

The hot gas uniformly circulated along the inner surface of the green tire 6 is sucked and collected by the pump 38 from the collection port 36 through the collection pipe 37, and is again heated by the heating means 40. It is released into the closed space 15 and circulates continuously thereafter.

Needless to say, the upper and lower dies 2 and 3 are also provided with heating means such as heaters.

Further, the collection pipe 37 may be provided on the upper center mechanism 16 side,
Both may be provided.

(Effects of the Invention) According to the present invention, the hot gas discharge that radially discharges the hot gas along the inner surface shape of the green tire 6 near the bead pressing plates 13 and 14 of the upper and lower center mechanisms 16 and 17. Exit 28,29
And a hot gas recovery port 36 for recovering the hot gas in the closed space 15 to the outside at the center of the central mechanisms 16 and 17, so that stirring means and the like are provided in the narrow closed space 15 inside the green tire 6. The hot gas can be uniformly circulated and stirred on the inner surface of the green tire 6 without providing the green tire 6, and uniform vulcanization molding without local over-vulcanization can be performed.

[Brief description of the drawings]

1 shows an embodiment of the present invention, FIG. 1 is a sectional view of a main part, FIG. 2 is a view taken along the line II-II of FIG. 1, and FIG. 3 is a configuration diagram of a hot gas system. 1 …………………………………………………………………… ·····················································,
…… Heat gas discharge port, 36 …… Heat gas recovery port.

Claims (1)

(57) [Claims] 1. A green tire (6) is provided in an openable / closable mold (1) having upper and lower central mechanisms (16) and (17), and a sealed space inside the green tire (6). In the bladderless tire vulcanizer that supplies hot gas to (15) to perform vulcanization molding, the upper and lower center mechanism (16) (17)
In the vicinity of the beat pressing plates (13) and (14), hot gas discharge ports (28) and (29) for radially discharging hot gas are provided along the inner surface shape of the green tire (6). )
A gas recirculation device for a bladderless tire vulcanizer, wherein a hot gas recovery port (36) for recovering a hot gas in a sealed space (15) to the outside is provided at the center of (17).