KR101879508B1 - Springless vent plug for tire vulcanizing mold - Google Patents

Abstract

The present invention discloses a springless vent plug of a tire vulcanization mold.
A spring-lease vent plug of a tire vulcanizing mold according to the present invention is inserted into a vent hole formed in a tire vulcanizing mold to discharge the residual air inside the vulcanizing mold to the outside. The vent plug of the tire vulcanizing mold has a vent hole A valve stem movably installed in the air passage; and a valve stem, which is pushed by the pressure of the rubber contained in the vulcanizing mold and is in contact with the casing to seal the air passage A valve member having a vent cap coupled to one end of the valve stem for allowing the valve stem to penetrate through the valve stem and a wire member arranged to provide an elastic repulsive force to the valve member through the through hole penetrating the valve stem, , It flows into the casing together with the air during the vulcanization. It is possible to reliably perform the air discharge operation from the vulcanized metal mold and to simplify the maintenance and to remarkably lower the bearing defects on the tire surface because the problem that the tire rubber adheres to the spring for operating the valve member is fundamentally cut off .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a tire vulcanizing mold,

The present invention relates to a spring-lean vent plug of a vulcanization mold for a tire, and more particularly, to a vulcanization mold for vulcanizing a vulcanization mold of a vulcanization mold, in which a tire rubber, The present invention relates to a spring-less vent plug of a tire vulcanizing mold capable of stably performing air discharge operation from a tire,

Tires are usually manufactured through a refining process, a semi-finished product process, a molding process, a vulcanizing process, and are marketed after an inspection process for selecting defective products in the manufacturing process. A brief description of each manufacturing process of a tire is as follows.

The refining process is a process of mixing all the components of the tire, such as natural rubber, synthetic rubber, reinforcing agents such as carbon black, and vulcanizing agents made of chemicals including sulfur, into rubber for tire, These include extrusion, rolling, cutting, and bead processes.

The molding process is a process of making semifinished products into a cylindrical rubber composite by sequentially assembling the semifinished products onto a molding machine drum, and a cylindrical green case is made through the molding process.

When a green case is put into a mold that serves as a mold, heat and pressure are applied, and the vulcanized rubber and vulcanized carbon are completely cured, and the tire is finished with elasticity.

In the vulcanizing process, a vulcanizing device is used in which a vulcanizing mold is mounted inside and a green case is heated. An air bag or a bladder is installed in the vulcanization device to apply heat and pressure to the green case to adhere the green case to the vulcanization mold and a device to heat the vulcanization mold to supply the heat to the vulcanization mold do.

High-pressure steam is used as the heating medium used in the vulcanization.

The tire vulcanizing mold has a vent hole for discharging the air generated when vulcanizing, thereby discharging air through the vent hole.

On the other hand, a ventless type mold which does not cause venting is used in order to prevent the appearance quality of the finished tire due to the molded rubber from deteriorating. A ventless type mold includes a vent plug with a valve that can be opened and closed. A valve type valve plug that can be opened and closed prevents the valve from being opened when the air is discharged, and the valve is closed when the tire is vulcanized. do.

7, the conventional vent plug 10 includes a casing 12 provided in a vent hole of a vulcanization mold, a hollow portion 13 of the casing 12, And a spring 19 for providing an elastic force to the valve member 15. The valve member 15 includes a vent cap 16 and a valve cap 16 which is coupled to the vent cap 16 A valve stem 17 and a stopper 18 provided at a lower end of the valve stem 17 and restricting the movement distance of the valve member 15. The tire rubber TR flows into the vent hole at the time of vulcanization of the tire In addition, it is necessary to remove the molded rubber formed in the green case through a separate process. In the case of removing the food waste formed in the green case, the food waste is cut using a knife, As a result, the cutting mark of the molded rubber remains, The appearance quality of the tire is lowered.

In the conventional vent plug 10, the tire rubber TR, which flows into the casing 12 together with the air during continuous vulcanization, tends to adhere to the spring 19 inside the casing 12, There is a problem that the rubber is adhered, the air discharge operation is not performed smoothly and the bear is defective.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a tire airbag apparatus and a tire airbag apparatus which substantially obviate the problem that tire rubber, The present invention provides a spring-lean vent plug of a tire vulcanization mold, which can be carried out easily, and can be easily maintained, thereby greatly reducing a bearing defect on a tire surface.

In order to solve the above-described technical problem, the present invention provides a vent plug for a tire vulcanizing mold, which is inserted into a vent hole formed in a tire vulcanization mold to discharge residual air inside the vulcanization mold to the outside, A valve stem movably installed in the air passage; and an air passage communicating with the air passage while being pushed by the pressure of the rubber contained in the air passage, A valve member having a vent plug coupled to one end of the valve stem, and a wire member disposed on the casing to pass through the through hole penetrating the valve stem to provide an elastic repulsive force to the valve member. Provide a spring-less vent plug for the mold.

According to an embodiment of the present invention, the wire member may be made of an alloy material.

According to another embodiment of the present invention, the wire member may be inserted into an insertion hole provided in the casing and provided with a restoration part at one end thereof.

According to another embodiment of the present invention, the restoring portion may exhibit a resistance force to operate in a direction opposite to a force of pulling the wire member into the casing through the insertion hole.

According to the present invention, it is possible to reliably perform the air discharge operation from the vulcanized metal mold by stably interrupting the problem that the tire rubber introduced into the casing together with the air during vulcanization adheres to the spring for actuating the valve member, Maintenance is also simple, which can drastically reduce bearings on the tire surface.

1 is a perspective view of a vent plug according to the present invention,
FIG. 2 is a perspective view of the vent plug of FIG. 1,
FIG. 3 is a cross-sectional view taken along the line IV-IV of FIG. 1,
FIG. 4 is a cross-sectional view showing a state in which a tire under vulcanization of a vent plug according to the present invention is in a state in which a press-
FIG. 5 is a view showing, in cross section, a shape in which a coil spring is interposed between a stopper and an insertion hole and is elastically operated at one end of a wire member of the present invention,
6 is a view showing, in cross section, a shape in which a plate spring is interposed between a stopper and an insertion hole and is resiliently actuated at one end of a wire member of the present invention,
FIG. 7 is a cross-sectional view of a conventional vent plug, in which (a) shows a state in which an opening is opened, and (b) shows a state in which a spring is not properly operated due to a foreign material.

Hereinafter, the present invention will be described in more detail.

It is to be noted that the technical terms used in the present invention are used only to describe specific embodiments and are not intended to limit the present invention, and the technical terms used in the present invention are defined in the present invention in a different sense It is to be understood that the present invention should not be construed in an overly broad sense or in an excessively reduced sense by a person having ordinary skill in the art to which the present invention belongs.

In addition, when a technical term used in the present invention is an erroneous technical term that does not accurately express the concept of the present invention, it should be understood that technical terms can be understood by those skilled in the art. In addition, the general terms used in the present invention should be interpreted according to a predefined or prior context, and should not be construed as being excessively reduced.

In addition, the singular forms "a", "an," and "the" include plural referents unless the context clearly dictates otherwise. For example, the terms "comprise" It is to be understood that the various steps need not necessarily be construed as encompassing all, some of the elements or portions of the steps may not be included, or may include additional elements or steps.

FIG. 1 is a perspective view of a vent plug according to the present invention, FIG. 2 is a perspective view showing the vent plug shown in FIG. 1, and FIG. 3 is a cross-sectional view taken along line IV- 5 is a perspective view of a wire member according to the present invention in which a coil spring is interposed between a stopper and an insertion hole as a restoring portion, 6 is a view showing, in cross section, a shape in which a plate spring is interposed between a stopper and an insertion hole and is resiliently operated as a restoration part at one end of a wire member of the present invention , Refer to this.

The springless vent plug 100 of the tire vulcanizing mold according to the present invention is inserted into a vent plug of a tire vulcanizing mold which is inserted into a vent hole (not shown) formed in a vulcanizing mold of a tire T to discharge residual air inside the vulcanizing mold to the outside A casing 110 coupled to the vent hole of the vulcanizing mold and having an air passage 112 for air flow; a valve stem 122 movably installed in the air passage; A valve member (120) having a vent cap (124) coupled to one end of the valve stem so as to be in contact with the casing and to seal the air passage while being pushed by the pressure of the rubber contained therein; And a wire member 140 arranged to pass through the hole 130 and to provide an elastic repulsive force to the valve member.

The valve stem of the valve member is inserted into the air passage 112 which is a hole penetrating the inside of the casing, and when the valve stem 122 is further advanced, the bent stopper 124 fixed at one end moves to enter the opening of the air passage 112 113 may be configured to form a tapered surface so as to be hermetically closed. On the contrary, when the openings are opened, the residual air can be discharged to the outside.

Here, it is advantageous to form the opening 113 so as to have an inclined surface that is tapered correspondingly to the reverse conical shape, and the vent cap may be formed in a shape that can be closely attached to the inclined surface.

In addition, when the vulcanizing operation is started in the state where the vulcanizing mold is engaged with the vent hole of the vulcanizing mold, the venting cap 124 maintains the state away from the opening 113 and performs vulcanization. When the vulcanization is terminated, In order to vulcanize the next entering green tire, the vent plug must be returned to its original state and the opening must be kept open. For this purpose, the vent cap should be kept at a certain distance.

A wire member 140 disposed to provide an elastic repulsive force to the valve member 120 passes through the through hole 130 passing through the valve stem and is fixed to the inner surface of the casing, So that the vent cap 124 can be kept apart from the opening.

In the case where the wire member is fixed, there is no influence on the spacing state or the elongated or contracted state of the wire member because there is no change in the length when the vent cap is kept in the spaced state. However, The wire member 140 should be made of a material having elasticity.

Therefore, the wire member 140 can be made of an alloy material such as a nickel-titanium alloy since the wire member 140 must have both elasticity and durability to withstand repeated stretching and shrinking by opening and closing a vent cap.

If the wire member 140 is made of a metal material having no elasticity or weakness, it is necessary to provide restoring force for repeated opening and closing movements of the vent cap 124. Therefore, the wire member is inserted into the insertion hole 114 provided in the casing And the restoration part 142 can be disposed at one end thereof.

The restoring part 142 is provided at one end of the wire member 140 so as to exert a resistance force in the opposite direction when the wire is pulled into the casing. The restoring part 142 includes a coil spring 142c, The spring 142c and the spring 142p are provided with a stopper 142s fixed to the end of the wire member passing through the insertion hole 114 so that the stopper 142s, So that a repeated opening and closing movement of the vent cap 124 is realized.

Vent plug 100, casing 110,
An air passage 112, an opening 113,
The insertion hole 114, the valve member 120,
Valve stem 122, vent cap 124,
Through hole 130, wire member 140,
Restoring portion 142, coil spring 142c,
The plate spring 142p, the stopper 142s,
Tire T,

Claims (4)

A vent plug of a tire vulcanizing mold which is inserted into a vent hole formed in a tire vulcanizing mold to discharge residual air inside the vulcanizing mold to the outside,
A casing coupled to the vent hole of the vulcanizing mold and having an air passage for air flow;
A valve stem movably installed in the air passage and a vent cap coupled to one end of the valve stem so as to be in contact with the casing while being pushed by the pressure of the rubber contained in the vulcanization mold to seal the air passage A valve member; And
And a wire member disposed in the casing so as to pass through the through-hole penetrating the valve stem to provide an elastic repulsive force to the valve member,
The wire member is made of nickel titanium, inserted into an insertion hole provided in the casing, and provided with a restoring portion at one end thereof,
Wherein the restoring portion exhibits a resistance force that acts in a direction opposite to a force of pulling the wire member into the casing through the insertion hole.
The method according to claim 1,
Wherein the wire member is made of an alloy material.
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