KR20030069699A - Air plug of tire vulcanization mold - Google Patents

Abstract

PURPOSE: An air plug for a tire vulcanizing mold is provided to shorten the length of a trimming process by mounting the air plug at a vent of the vulcanizing mold and preventing the generation of squeezed-rubber. CONSTITUTION: An air plug(10) is placed at a vent formed at a tire vulcanizing mold, and prevents the generation of squeezed-rubber. The air plug includes a body(11) having an air passage. A piston(12) is inserted into the body, and has a stepped part. A spring(S) is mounted on the lower part of the piston. An air discharge groove(14) is formed at the outer circumference of a spline(13) mounted on the lower surface of the spring.

Description

Air plug of tire vulcanization mold

The present invention relates to an air plug of a tire vulcanization mold, and more particularly, a plurality of vents radially perforated in order to discharge the stagnant air to the outside for optimal molding of tire grooves. In the vulcanization mold, the inner side surface of the body of the air plug interposed in the vent and the piston binding to the inner side surface of the body can be released by the pneumatic and elastic force to produce a very small amount of extraction rubber, and the extraction rubber An air plug of a tire vulcanization mold that shortens the trimming process due to blocking production.

In general, the purpose of vulcanization in tires is to put green tires made of flexible rubber into certain molds to apply heat and pressure inside and outside to cause sulfur and other chemicals to react with the rubber. By chemical reaction, rubber molecules combine with sulfur to become a stable compound, gain elasticity, and a unique tread design by a mold.

In addition, the vulcanization process can be broadly divided into release agent application, vulcanization work, expansion work, and finishing work, and vulcanization molds for tires are roughly divided into two-piece pieces and sectional forms. The part is supposed to be fully bonded by the basic principle, but in actual vulcanizer, the rubber flows into the joint gap before the upper and lower molds are completely joined, and it remains as an extraction rubber and sticks on the tire.

On the other hand, in the vulcanization process as described above, it is necessary to adjust the steam, hot water, cooling water, high pressure air, etc. necessary for vulcanization operation according to time, and after the vulcanization is finished, air or gas remaining in the mold of the vulcanizer is removed. The tires must be removed, especially when the air remaining in the corners of the tread pattern is discharged to ensure the shape of the product tire.

1 is a perspective view of a state where extraction rubber is formed on the outer circumferential surface of a tire formed by a general vulcanization mold, FIG. 2 is a sectional view of a general tire vulcanization mold, and FIGS. 3A and 3B are sectional views of a plug provided in the conventional mold. The conventional vulcanization molds 1 and 2 penetrate vents 3 having a constant diameter in a radial direction to allow air inside the molds 1 and 2 to be discharged to the outside through the vents 3. In the vulcanizing molds 1 and 2 equipped with (4, 6), the plugs (4, 6) are pipe-shaped and have a discharge port (5) formed therein and a cone-shaped discharge hole (7). There is formed. However, after the tire T is formed by the vulcanization molds 1 and 2, when the tire T is separated from the vulcanization molds 1 and 2, the rubber forming the tread portion flows out to the vent 3 at the same time as the air is discharged. Due to the extraction rubber (8) is formed, the extraction rubber (8) is sometimes raised when the extraction rubber (8) is detached from the plug (4, 6) mounted on the vent (3), Even when there was a problem that the work process to remove the extraction rubber (8) is increased.

The present invention has been made to solve the above-mentioned conventional problems, the main object of the present invention is to install the air plug in the vent of the vulcanization mold by suppressing the production of extraction rubber to reduce the trimming process air of the tire vulcanization mold The purpose is to provide a plug.

1 is a perspective view of a state where the extraction rubber is formed on the outer circumferential surface of the tire formed by a conventional vulcanization mold,

2 is a cross-sectional view of a general tire vulcanization mold,

3a and 3b is a cross-sectional view of the plug provided in the conventional mold,

Figure 4 is an exploded perspective view of the air plug of the tire vulcanization mold of the present invention,

5a and 5b is a cross-sectional view showing the operating state of the air plug of the tire vulcanization mold of the present invention,

6 is an exploded perspective view of an air plug according to another embodiment of the present invention;

7 is an exploded perspective view of an air plug according to another embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

1, 2: vulcanization mold 3: vent

8: extraction rubber 10: air plug

11 body 12 piston

13: spline 14, 24, 34: air blowing passage

23: toothed pin 33: knurling pin

L: Working distance S: Spring

T: Tire

The air plug of the tire vulcanization mold according to the present invention for solving the above problems has a plurality of vent (vent) to discharge the air stagnated in the vulcanization mold for optimal molding of the tire groove (groove) In the radially plural vulcanized molds, an air plug is installed in the vent to shorten the trimming process by intercepting the production of a large amount of bleed rubber. The air plug has a hollow air passage and a piston having a pipe-shaped body having an upper inner circumferential surface and a lower outer circumferential surface, and a stepped portion of which is tapered on an upper side to enable opening and closing of a spline and a plug; After retreating by this pneumatic, when the air is discharged, it is restored by the elastic force of the spring, mounted on the lower surface of the spring and pressurized into the air passage of the body, respectively, to splines that selectively discharge only air inside the mold during molding. An air discharge groove is formed to constitute a plurality of fine air discharge passages of the body 11 coupled to the outside thereof.

Hereinafter, the air plug of the tire vulcanization mold of the present invention will be described with reference to the accompanying drawings.

Figure 4 is an exploded perspective view of the air plug of the tire vulcanization mold of the present invention, Figures 5a and 5b is a cross-sectional view showing the operating state of the plug of the air plug of the tire vulcanization mold of the present invention.

Vulcanization mold (1, 1) in which a plurality of vents (3: vents) are radially perforated in order to discharge air stagnated in molds (1, 2) for optimal molding of tire (T) grooves to the outside 2), a check valve type air plug 10 which shortens the trimming process by interrupting the production of the bleed rubber 8 interposed in the vent 3, the air plug ( 10 is a pipe shape in the upper side and the lower side of the outer tapered body 11, the taper is processed on the upper side so as to be opened and closed in the interior of the body 11 to enable the opening and closing of the air plug 11 Piston 12 having a stepped portion, and after the piston 12 is retracted by pneumatic, when the air is discharged is restored by the elastic force of the spring (S), splines mounted on the lower surface of the spring (S) Air discharge grooves 14 are formed in 13, respectively.

The lower surface of the piston 12 of the air plug 10 and the upper surface of the spline 13 are spaced apart by a predetermined working distance L, and the air plug retracted by the air pressure injected into the vulcanization molds 1 and 2. The piston 12 of 10 prevents further retraction by the top surface of the spline 13.

Therefore, when rubber is injected into a mold (1, 2) to apply heat and pressure from the inside and outside, and air is injected into the mold (1, 2) for optimal molding of the tire (T) groove, a plurality of radially radially The piston 13 in the air plug 10 mounted on the perforated vent 3 is retracted by the working distance L, and the inner side of the body 11 of the air plug 10 and the retracted piston ( As the gap of the outer side of 12) is generated, a very small amount of rubber is extracted between the gaps and the air is discharged to the outside of the molds 1 and 2 through the air discharge grooves 14 of the spline 13. As a result, the piston 12 rises to prevent extraction of the tire.

6 is an exploded perspective view of an air plug according to another embodiment of the present invention, and FIG. 7 is an exploded perspective view of the air plug according to another embodiment of the present invention, wherein a spline mounted inside the body 11 of the air plug 10 ( It is possible to replace the tooth pin 23 or the knurling pin 33 is formed in the air blowing passages (24, 34) that can be replaced in 13).

The air plug of the tire vulcanization mold of the present invention has an effect of shortening the trimming process due to the formation of a very small amount of extraction rubber by mounting an air plug on the vent of the vulcanization mold.

Claims (2)

In a vulcanizing mold in which a plurality of vents (3) are radially perforated in order to discharge the air stagnated in the vulcanization molds (1, 2) for optimum molding of the tire groove to the outside, the vent An air plug 10 of a check valve type interposed between the air plug 10 and a hollow air passage provided in the air plug 10 to intervene in (3) to block the production of the extraction rubber 8 during the growth of the tire. A piston 12 having a stepped portion interposed inside the body 11 and tapered on the upper side to open and close the plug 10, and the piston 12 is provided with pneumatic pressure. After being retracted by air, the air is discharged and restored by the elastic force of the spring S mounted on the step of the lower part of the piston 12, respectively, the air blowing passages on the splines 13 mounted on the lower surface of the spring S, respectively. Tire vulcanization gold characterized by the configuration 14 is formed An air plug. The toothed pin 23 or the knurling pin (2) according to claim 1, wherein the air ejection passages (24, 34) are formed on the splines (13) mounted inside the body (11) of the air plug (10). 33. An air plug of a tire vulcanization mold, characterized in that it is replaceable.