KR20030061960A - Apparatus for Control the Pressure of Vulcanizer - Google Patents

Abstract

PURPOSE: A device for controlling vacuum pressure for a vulcanizer is provided to lengthen the life of a bladder and to reduce reject rate by keeping the vacuum pressure in the vulcanizer optimal. CONSTITUTION: A pressure detecting line(1) is installed at one side of an inlet line(8). A pressure detecting converter(5) is installed at the pressure detecting line. An air piston valve(2) is connected to a solenoid valve(3). The air piston valve and a filter(4) are installed at the pressure detecting line. A control unit(6) is electrically connected to the pressure detecting converter.

Description

Apparatus for Control the Pressure of Vulcanizer

The present invention relates to an apparatus for controlling the vacuum pressure in the vulcanizer, and in particular, by comparing the actual pressure in the vulcanizer with the set pressure of the control panel, the inside of the vulcanizer can always maintain the optimum vacuum pressure state, thereby preventing tire defects. It relates to a vacuum pressure control device of a vulcanizer which is capable of suppressing and extending the life of the bladder.

In general, the green tires, which are semi-finished tires made in the tire forming process, are transported to the vulcanization process and enter the vulcanizer mold to determine the appearance of the tire, where the green tires are formed on the inner surface of the vulcanizer mold by the pressure inside the vulcanizer mold. When pressed, the tread pattern, side shape, imprinted letters, and trademarks are printed.

In addition, since the green tire is heated by a heat medium such as steam or hot water from the inner / outer surface, a vulcanization reaction occurs in the entire green tire, and when a predetermined time elapses, the green tire is converted into a fully elastic vulcanized rubber structure to produce a finished tire.

Here, a closer look at the pressure control device during the vulcanization process of the green tire, as shown in Figure 2, is provided with an ejector (Ejector) 101 for ejecting the fluid, the inlet line is connected to the ejector 101 ( 102 and the lead-out line 103 is configured to be connected to the inside of the bladder 105 installed in the lower ring 104 of the vulcanizer with an air piston valve 106 interposed therebetween, the ejector 101 As the fluid is ejected through the venturi, the vacuum pressure inside the bladder 105 is adjusted through the inlet / outlet lines 102 and 103 by the Venturi effect.

However, since the pressure control of the conventional vulcanizer is controlled only by a predetermined time, if the green tire inlet or tire withdrawal time is delayed, the pressure of the bladder 105 is the same as the main pressure vacuum (-0.2 kg / cm2g). Therefore, excessive vacuum is generated, causing rubber peeling on the inner surface of the bladder 105 and premature cracking of the outer ear, thereby shortening the life of the expensive bladder 105.

In addition, it is necessary to observe the vacuum state in detail and set the time, but when the main pressure decrease or the time setting is insufficient, the bladder 105 overlaps or fails to overlap the bladder 105 due to the introduction and withdrawal of the green tire or tire in the vacuum poor state. Not only is it difficult to produce normal tires due to bending problems, etc., and when the bladder 105 is repeatedly used in an over-vacuum state for a long time, the surface rubber inside the bladder 105 gradually becomes larger in a bubble state, causing peeling. As it flows into the inside, it becomes a failure factor of various operation valves, and the separation rubber is blocked by a fine curved pipe part, which makes it difficult to identify the cause of the failure, thereby increasing the downtime of the facility.

Accordingly, the present invention has been invented to solve the above problems, the pressure sensing line is installed on one side of the inlet line connected to the bladder, the air piston valve and the filter and the pressure sensing transducer sequentially on the pressure sensing line On the other hand, the pressure sensing transducer is connected to the control panel, it is possible to maintain the optimum internal vacuum pressure in accordance with the change of the internal vacuum pressure of the bladder to extend the service life of the bladder, suppress the occurrence of tire failure On the other hand, it is an object of the present invention to provide a vacuum pressure control device of a vulcanizer to prevent the bladder peeling phenomenon to improve the productivity.

1 is a configuration diagram of a vulcanizer having a pressure control device according to the present invention;

2 is a configuration diagram of a vulcanizer according to the prior art, which corresponds to FIG.

-Explanation of symbols for the main parts of the drawings-

1: Pressure sensing line 2, 12: Air piston valve

3: solenoid valve 4: filter

5 pressure transducer 6 control panel

7: ejector 8: inlet line

9: drawing line 10: lower ring

11: bladder

The present invention for achieving the above object is provided with a pressure sensing line on one side of the inlet line connected to the bladder, the air piston valve and the filter and the pressure sensing transducer is sequentially connected to the pressure sensing line, The pressure sensing transducer is electrically connected to the control panel, and the pressure sensing transducer can variably control the vacuum degree of the bladder according to the set value of the bladder.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of a vulcanizer having a pressure regulating device according to the present invention, the present invention is provided with an ejector (7) to eject the fluid, the inlet line (8) connected to the ejector (7) and withdrawal In the vacuum pressure control device of the vulcanizer configured to be connected to the inside of the bladder 11 installed in the lower ring 10 of the vulcanizer with the line 9 interposed between the air piston valve 12, the inlet line ( 8) A pressure sensing line 1 is installed on one side, and an air piston valve 2 and a strainer 4 connected to a solenoid valve 3 are disposed on the pressure sensing line 1. A pressure sensing transducer 5 is provided, and a control panel 6 electrically connected to the pressure sensing transducer 5 is provided.

Accordingly, when the green tire is mounted inside the vulcanizer mold, the fluid is ejected from the ejector 7 and the pressure and the pressure are reduced through the inlet / outlet lines 8 and 9, wherein the pressure sensing line 1 It is filtered while passing through the filter 4 through the air piston valve (2) to the operating pressure is sensed by the pressure transducer (5).

At this time, when the detected operating pressure is compared with the preset vacuum pressure in the control panel 6 and the actual operating pressure is larger than the set value, a signal is sent from the control panel 6 to open the air piston valve 12 so that the operating pressure On the contrary, when the actual operating pressure is lower than the set pressure, the control panel 6 sends a signal to shut off the air piston valve 12 so that the pressure inside the bladder 11 is always optimal. Since it is operated to maintain, the vacuum pressure in the bladder 11 can always maintain the optimum state by the value preset in the control panel 6 regardless of the operator's arbitrary operation or time variable.

As described above, according to the present invention, a pressure sensing line is installed at one side of an inlet line connected to the bladder, and an air piston valve, a filter and a pressure sensing transducer are sequentially connected to the pressure sensing line, and the pressure sensing The transducer is configured to be electrically connected to the control panel, so that the vacuum degree inside the bladder is always maintained at an optimum state, which extends the service life of the bladder, suppresses tire defects, and prevents bladder peeling. This has the effect of improving productivity.

Claims (1)

Ejector is provided to eject the fluid, the inlet line and the outlet line connected to the ejector is configured to be connected to the interior of the bladder installed in the lower ring of the vulcanizer with the air piston valve therebetween, respectively To A pressure sensing line 1 is installed at one side of the inlet line 8, and the pressure sensing line 1 has a pressure between the air piston valve 2 and the filter 4 connected to the solenoid valve 3 and the pressure 4 therebetween. The sensing transducer (5) is installed, the vacuum pressure control device of the vulcanizer, characterized in that the control panel (6) which is electrically connected to the pressure sensing transducer (5) is provided.