JP2011126044A - Tire vulcanization apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tire vulcanization apparatus which includes a heating means, allows reduction of energy loss and running costs and improvement of the precision of temperature control, is inexpensive and shows good processability. <P>SOLUTION: The tire vulcanization apparatus carries out vulcanization molding of a green tire T contained in an outer mold, e.g. upper and lower platens 11a and 11b or a jacket ring 13, by heating the green tire T from the outside and inside of the tire. As the means of heating the tire T from at least the outside, a mica heater 15, used in ordinary domestic electric appliances, is attached to the outer mold, e.g. upper and lower platens 11a and 11b or a jacket ring 13, and the outer mold is heated directly or through a heat medium 21. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a tire vulcanizing apparatus for vulcanizing and molding a raw tire.

  Usually, when a raw tire is vulcanized, an outer mold (mold) filled with the raw tire is heated by a heating medium, and a high-temperature and high-pressure heating medium is supplied to the internal space of the raw tire Thus, the inner wall surface of the tire is pressed toward the outer mold while being heated. Then, vulcanization is performed by heating the green tire from the outside and the inside with the heated outer mold and the heating medium in the internal space of the green tire.

  Conventionally, as a means for heating the raw tire from the outside, for example, there is one as shown in FIG. 10 (see Patent Document 1 and Patent Document 2). This is because the upper and lower platens 100a and 100b, the jacket ring 101 as the outer ring, and the like are formed as flow paths in the upper and lower platens 100a and 100b as the outer mold of the vulcanizing mold that accommodates the raw tire T. Steam (heating medium) is supplied and circulated from the factory steam boiler 104 through the piping unit 102 and the factory main pipe 103 to the flow path (see piping in the figure), and heat is transferred from the outer mold to the raw tire T. is there. In addition, the steam described above is supplied and circulated through the lower center mechanism (not shown) into the internal space (in the bladder B) of the raw tire T, and heating or pressurized medium such as nitrogen (N2) gas or hot water is supplied. It is designed to be sealed.

  Further, as another heating means, an electromagnetic coil is arranged around the outer mold, the surface of the outer mold is induction-heated (see Patent Document 3 and Patent Document 4), and a rod heater is embedded in the outer mold, There is one that indirectly heats the outer mold (see Patent Document 5 and Patent Document 6).

Japanese Patent Laid-Open No. 5-200754 JP-A-8-238626 JP 2001-205636 A JP 2008-1000051 A JP 2002-36243 A JP 2000-43048 A

  However, the steam heating method as shown in FIG. 10 has a problem that the running cost becomes high because a large energy loss occurs due to heat radiation from the steam supply pipe. In addition, it requires piping work between the factory main pipe and the vulcanizer, which cannot be changed easily, which makes the factory layout very difficult, or condensate drain in the steam flow path between the upper and lower plates. There are also problems such as difficulty in controlling the zone temperature.

  Against this background, in recent years, when heating vulcanization molds, there is a tendency to abolish the steam heating method and shift to the electric heating method, and various tire vulcanizers have been developed based on the concept of so-called all-electricity. What is being done is the current state of the industry.

  In addition, in the induction heating method, it takes a lot of time to control the heating (adjusting the magnetic force and magnetic field) according to the structure of the vulcanizer and the tire mold, and also for the installation of electromagnetic coils and electrical insulation materials. As a result, the size of the apparatus increases, leading to an increase in cost.

  Also, in the case of using a rod heater, it is necessary to embed it in a vulcanizing mold, and since the contact area between the mounting hole and the heater is small, the heating efficiency is low and the running cost is high. It was. In addition, heater mounting holes (machining) are required, and the arrangement pitch of the rod-shaped heaters is limited, so the temperature uniformity and temperature controllability are poor, and the heater itself has a large heat capacity, so it takes time to raise the temperature. Have.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a tire vulcanizer equipped with heating means that can reduce energy loss and running cost, improve temperature control accuracy, and is inexpensive and has good workability.

A tire vulcanizing apparatus according to the present invention for achieving such an object,
In a tire vulcanizing apparatus for heating and vulcanizing a raw tire housed in an outer mold from outside and inside the raw tire,
As a means for heating the green tire from at least the outside, a flexible planar heating element used for ordinary household appliances is attached to the outer mold, and the outer mold is heated directly or via a heat medium. It is characterized by doing.

Also,
The flexible planar heating element is a mica heater.

Also,
The flexible planar heating element is divided into a plurality of parts according to the zone temperature control of the outer mold.

Also,
The flexible planar heating element is attached in combination with a heat insulating material.

Also,
The flexible planar heating element is partly attached in a steam heating type tire vulcanizer.

  According to the tire vulcanizing apparatus according to the present invention, since steam from a factory steam boiler is not used, energy loss and running cost can be reduced. In addition, the simple means of attaching a flexible planar heating element used for household appliances has the advantage that the heating running cost can be reduced, the accuracy of temperature control can be improved, and the cost can be reduced.

It is a heating system figure of the tire vulcanizer which shows one example of the present invention. It is a structural diagram of a mica heater. It is an attachment structure figure of a mica heater, a heat insulating material, and a platen. It is another attachment structure figure of a mica heater, a heat insulating material, and a platen. It is an attachment structure figure of a mica heater and a platen. It is another attachment structure figure of a mica heater and a platen. It is an attachment structure figure of a mica heater, a platen, and a heat carrier. It is a top view which shows the division pattern of the mica heater in a platen. It is a top view which shows the other division | segmentation pattern of the mica heater in a platen. It is a plane (horizontal) sectional view which shows the attachment structure of a mica heater and a jacket ring. It is a side (longitudinal) sectional view showing a mounting structure of a mica heater and a jacket ring. It is a plane (horizontal) sectional view which shows the attachment structure of a mica heater, a heat insulating material, and a jacket ring. It is a side (longitudinal) sectional drawing which shows the attachment structure of a mica heater, a heat insulating material, and a jacket ring. It is a plane (horizontal) sectional view showing an attachment structure of a mica heater, a heat medium, and a jacket ring. It is a side (longitudinal) sectional drawing which shows the attachment structure of a mica heater, a heat medium, and a jacket ring. It is a heating system figure of the conventional tire vulcanizer.

  Hereinafter, a tire vulcanizing apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a heating system diagram of a tire vulcanizing apparatus showing an embodiment of the present invention, FIG. 2 is a mounting structure diagram of a mica heater, FIG. 3A is a mounting structure diagram of a mica heater, a heat insulating material, and a platen, and FIG. 4A is a mounting structure diagram of the mica heater and the platen, FIG. 4B is another mounting structure diagram of the mica heater and the platen, FIG. 5 is a mounting structure diagram of the mica heater, the platen, and the heating medium, and FIG. FIG. 6B is a plan view showing another divided pattern of the mica heater in the platen, FIG. 7A is a flat (lateral) sectional view showing the mounting structure of the mica heater and the jacket ring, and FIG. 7B is a mica heater. Side (longitudinal) sectional view showing the mounting structure of the jacket ring, FIG. 8A is the mounting of the mica heater, the heat insulating material and the jacket ring FIG. 8B is a side (vertical) cross-sectional view showing the mounting structure of the mica heater, the heat insulating material, and the jacket ring, and FIG. 9A is a flat (horizontal) showing the mounting structure of the mica heater, the heat medium, and the jacket ring. ) Cross-sectional view, FIG. 9B is a side (vertical) cross-sectional view showing the mounting structure of the mica heater, the heat medium and the jacket ring.

  As shown in FIG. 1, a container 10 of a tire vulcanizer includes a plate made of upper and lower platens 11a and 11b and upper and lower container plates 12a and 12b, a jacket ring 13 and segments (including divided segments) 14. Etc., and these are commonly called outer molds. The raw tire T is inserted into the outer mold through a tread mold portion Ma, upper and lower sidewall mold portions Mb and Mc, and upper and lower bead rings Md and Me (these are commonly referred to as split molds). Is housed.

  Also, a known bladder B is inserted into the internal space of the raw tire T, and steam is supplied and circulated through the lower center mechanism (not shown) in the bladder B, and nitrogen (N2) gas, hot water, etc. The heating / pressurizing medium is also sealed.

  Therefore, by heating the outer mold described above by the heating means described later, supplying a high-temperature, high-pressure heating medium into the bladder B described above and pressing the tire inner wall surface in the outer mold direction, The raw tire T is heated from outside and inside by the heated outer mold and the heating medium in the bladder B, and vulcanization is performed.

  In this embodiment, the mica heater 15 as a flexible planar heating element is attached to the upper and lower platens 11a and 11b and the jacket ring 13 among the outer molds described above by various attachment structures described later. Electric power is supplied from the heater power sources 16A and 16B corresponding to the heat sources used for household appliances through the feeder lines 17A and 17B, and the upper and lower platens 11a and 11b and the jacket ring 13 are directly or directly heated. It is heated via (steam, hot water, oil, gas, etc.).

  As shown in FIG. 2, the mica heater 15 is an electric heater in which a heating resistor (foil) 15b is sandwiched between mica (insulation) plates 15a. (1) Electrical insulation, heat resistance (up to 600 ° C.), compression resistance Excellent in flexibility, water resistance, chemical resistance, (2) Smoke, odor, gas generation and mica blistering at high temperature, (3) Excellent punching and workability, (4) High watt density Because it is thin (thickness of about 1 mm → heat capacity is small), high-speed temperature rise is possible (good response), (4) because of the planar heating element, heating efficiency is good (contact area is large), It has characteristics such as uniform heat generation (uniform temperature distribution), and is used in home appliances such as heating and preheating of hot plates, pots, and electronic jars.

Next, various attachment structures for the mica heater 15 will be described.
FIG. 3A shows an example in which vertical and horizontal mica heaters 15 and a heat insulating material 20 for reducing heat loss are embedded in cavities having rectangular cross sections of the upper and lower platens 11a and 11b. Is fastened with bolts to the upper and lower platens 11a and 11b. In this case, it is preferable to join the horizontal mica heater 15 side to the container plates 12a and 12b side. Further, instead of the upper and lower platens 11a and 11b, the mica heater 15 may be attached to the container plates 12a and 12b with the same structure.

  The example shown in FIG. 3B is an example in which a mica heater 15 is embedded in a cavity having a rectangular cross section of the upper and lower platens 11a and 11b, and a heat insulating material 20 is attached to one surface of the upper and lower platens 11a and 11b. The mica heater 15 is sandwiched between the upper and lower members of the upper and lower platens 11a and 11b. In this case, it is preferable to join the mica heater 15 side to the container plates 12a and 12b side. Further, instead of the upper and lower platens 11a and 11b, the mica heater 15 may be attached to the container plates 12a and 12b with the same structure.

  4A and 4B show an example in which the mica heater 15 is fastened to one of the upper and lower platens 11a and 11b as a plate with a bolt. Moreover, you may attach the heat insulating material 20 for heat radiation loss reduction suitably as shown with the chain line in a figure. In addition, instead of the upper and lower platens 11a and 11b, the mica heater 15 may be attached to the container plates 12a and 12b with the same structure.

  FIG. 5 shows that the upper and lower platens 11a and 11b are filled with a heat medium (steam, hot water, oil, gas, etc.) 21 in cavities having a rectangular cross section of the upper and lower platens 11a and 11b as plates. The mica heater 15 is attached to one surface, and the mica heater 15 is fastened with bolts to the upper and lower platens 11a and 11b. In this case, it is preferable to join the upper and lower platens 11a and 11b directly to the container plates 12a and 12b. As indicated by a chain line in the figure, a heat insulating material 20 for reducing a heat dissipation loss may be appropriately attached. In addition, instead of the upper and lower platens 11a and 11b, the mica heater 15 may be attached to the container plates 12a and 12b with the same structure.

  6A and 6B are examples of the division of the mica heater 15 in the upper and lower platens 11a and 11b described above, and can be divided into various shapes according to the zone temperature control or the like. Further, instead of the upper and lower platens 11a and 11b, the mica heater 15 may be attached to the container plates 12a and 12b with the same structure.

  7A and 7B show an example in which a mica heater 15 divided into a plurality of parts in the vertical direction and the circumferential direction is fastened with bolts on the outer peripheral surface of a jacket ring 13 as an outer ring. Moreover, you may attach the heat insulating material 20 for heat radiation loss reduction suitably as shown with the chain line in a figure. Instead of the jacket ring 13, the mica heater 15 may be attached to the segment (including divided segments) 14 side with the same structure.

  8A and 8B show an example in which a heat insulating material 20 and a mica heater 15 divided into a plurality of parts in the vertical direction and the circumferential direction are embedded in a cavity (jacket) of a jacket ring 13 as an outer ring. . The mica heater 15 is fastened to the jacket ring 13 (located on the inner peripheral side of the cavity) with a bolt. Further, instead of the jacket ring 13, the mica heater 15 may be attached to the segment (including divided segments) 14 side with the same structure.

  9A and 9B show that the mica heater 15 divided into a plurality of parts in the vertical direction and the circumferential direction is fastened with bolts to the outer peripheral surface of the jacket ring 13 as an outer ring, and the cavity (jacket) of the jacket ring 13 is used. This is an example in which a heat medium (steam, hot water, oil, gas, etc.) 21 is filled. The mica heater 15 is fastened to the jacket ring 13 with a bolt. Moreover, you may attach the heat insulating material 20 for heat radiation loss reduction suitably as shown with the chain line in a figure. Instead of the jacket ring 13, the mica heater 15 may be attached to the segment (including divided segments) 14 side with the same structure.

As described above, in this embodiment, the mica heater 15 as the flexible planar heating element is attached to the outer molds such as the upper and lower platens 11a and 11b and the jacket ring 13 of the container 10, and the outer mold (to be heated) )) Directly or via a heating medium,
(1) Boilers (heating medium), factory / equipment piping (supply and recovery), piping equipment, and piping work are no longer required, reducing piping heat dissipation (energy) loss, reducing running costs and downsizing the equipment.
(2) Since the contact area is large due to the surface heat generation, the power density can be increased and the heating efficiency to the object to be heated is improved, so that the accuracy of the temperature control can be improved and the zone temperature control is possible. Become,
(3) Mica heaters are inexpensive, thin and have good workability, so they can be heated and mounted in a shape that matches the object to be heated, and the outer mold can be made thinner and the insulation can be made thicker. It is possible to improve the compactness of the device and improve the heat insulation of the mold and make it compatible with existing devices.
(4) Since the mica heater is thin (about 1 mm), the heat capacity is small and the power density is higher than that of the rod heater, so the response when heating the heated object is good (the controllability during heating is good)
(5) Factory steam boilers require constant operation, but with this technology it is possible to control heating while supplying power only to the parts necessary for heating (vulcanizers), so the heating running cost can be reduced. ,
The following actions and effects can be obtained.

Needless to say, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention. For example, you may use electric heaters other than a mica heater as a flexible planar heating element used for a normal household appliance.
In addition, a flexible sheet heating element used for a normal household appliance is used in a conventional steam heating type tire vulcanizing apparatus, for example, upper and lower platens 11a and 11b and upper and lower container plates 12a and 12b. You may make it attach partially to the plate etc. which consist of etc.

  The tire vulcanizing apparatus according to the present invention is preferably used in a so-called self-locking tire vulcanizing apparatus in which a container has a function of locking a mold.

10 Upper container 11a, 11b Upper platen 12a, 12b Upper, lower container plate 13 Jacket ring 14 Segment (including split segments)
15 Mica heater 16A, 16B Heater power supply 17A, 17B Feed line 20 Heat insulating material 21 Heat medium (steam, hot water, oil, gas, etc.)
T Raw Tire B Blada

Claims (5)

In a tire vulcanizing apparatus for heating and vulcanizing a raw tire housed in an outer mold from outside and inside the raw tire,
As a means for heating the green tire from at least the outside, a flexible planar heating element used for ordinary household appliances is attached to the outer mold, and the outer mold is heated directly or via a heat medium. A tire vulcanizing apparatus.   The tire vulcanizing apparatus according to claim 1, wherein the flexible planar heating element is a mica heater.   The tire vulcanizing apparatus according to claim 1, wherein the flexible planar heating element is divided into a plurality of parts according to zone temperature control of an outer mold.   The tire vulcanizing apparatus according to claim 1, wherein the flexible planar heating element is attached in combination with a heat insulating material.   The tire vulcanizing apparatus according to claim 1, 2, 3, or 4, wherein the flexible planar heating element is partially attached in a steam heating type tire vulcanizing apparatus.

Images