JP2002323158A - Quick exhaust valve and tire-forming machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a quick exhaust valve whose shape is contracted, which can be installed easily and can supply negative pressure (suction of air) and supply of positive pressure (supply of air), and exhaust air and a tire-forming machine provided with it. SOLUTION: This quick exhaust valve is provided with an air supply side port, an air supplied side port, a casing provided with a cylindrical space with the inner end face of a first passage communicating to the supply side port inside and the inner end face of a second passage communicating to the supplied side port opened, opposed to each other and with an exhaust port formed on the side of a cylindrical circumference face, a valve element inserted in the cylindrical space, capable of sliding between the inner end face of the first passage and the inner end of the second passage, and a sleeve of an elastomer member attached to the outer circumference of the casing and covering the exhaust port; and the valve element is so constituted, that it is provided with a hole through which air can pass and blocks the exhaust port, when touching the inner end face of the second passage and will not block the exhaust port, when touching the inner end face of the first passage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rapid exhaust valve capable of supplying and exhausting a positive pressure and supplying a negative pressure, and a tire molding machine having the same.

[0002]

2. Description of the Related Art Conventionally, a rapid exhaust valve has been used for supplying air at a positive pressure from an air supply source to a supply destination and for discharging air from the supply destination by stopping the supply of the positive pressure from the air supply source. Have been.

[0003] For example, in a tire molding machine, a bladder air is supplied to a bladder for molding a green tire into a predetermined shape, and a rapid exhaust valve is used to rapidly discharge the bladder air from the bladder after the molding.

[0004] Fig. 2 is a schematic structural view of a general tire forming machine 1. To explain, a tire (not shown) to be formed is sandwiched on a circumferential surface of a forming drum 3 which is connected to a rotary driving machine 2 and rotates. Alternatively, a bladder 4 for inflation is attached.

The forming drum 3 is provided with a quick exhaust valve 06 which is connected to a bladder air supply device 5 which is an air supply source by piping through a suitable rotary joint (not shown). The supply side port 06a communicates with the bladder air supply device 5, and the bladder side port 06b
Communicates with the bladder 4 to which air is supplied, and the exhaust port 0
6c is open to the atmosphere or communicates with an appropriate exhaust path.

[0006] In the tire forming machine 1 shown in FIG.
When the molding of the raw tire is completed, the supply of air from the bladder air supply device 5 is stopped, and the air in the bladder 4 is exhausted through the rapid exhaust valve 06.

FIG. 3 shows an example of a conventional rapid exhaust valve used in a tire molding machine and will be described. 3A and 3B are longitudinal sectional views of the conventional quick exhaust valve 06, wherein FIG. 3A shows a state when air is supplied, and FIG. 3B shows a state when air is discharged.

As shown in FIG. 3, a conventional quick exhaust valve 06 is used.
Are the supply-side casing 061 and the bladder-side casing 06
2 is fastened with bolts 07, and has a box-shaped structure. A cylindrical space 08 is formed inside both casings 061 and 062.

[0009] The supply-side casing 061 is perforated with a flow path 061a along the center line of the cylindrical space 08 to form a supply-side port 06a to the outside. In the bladder side casing 062, a flow path 062a is perforated along the center line of the cylindrical space 08, and an exhaust port 06 is provided to the outside.
c is formed.

In addition, a flow passage communicating with the space 08 in a direction perpendicular to the center line of the cylindrical space 08 is bored in a side portion of the bladder side casing 062, and a bladder side port 06 is provided to the outside.
b is formed.

The flow path 061a and the flow path 062a extend into the space 08, and the inner end face 09 of the flow path 061a and the flow path 062a.
The inner end faces 010 face each other at regular intervals, and a piece-shaped valve element 011 made of an elastic member such as rubber is inserted between them, and a lip portion in contact with the inner surface of the cylinder of the space 08 is provided around the valve element 011. 011a is formed. The lip portion 011a forms an oblique cross section from the supply side casing 061 side toward the bladder side casing 062 side as going from the center side to the peripheral side of the valve body 011.

The conventional quick exhaust valve 06 having the above-described structure is used.
The operation of the quick exhaust valve 06 in the case where is provided in the tire forming machine 1 as shown in FIG. 2 will be described below.

When molding a green tire, positive pressure air a is supplied from the bladder air supply device 5 to the supply port 06a of the quick exhaust valve 06. As shown in FIG. The space 08 enters the space 08 from the path 061a, but the valve body 011 is pushed up by the positive pressure of the air a, and the flow path 062a
And the exhaust port 06c is closed.

The air a entering the space 08 passes between the lip portion 011a of the valve body 011 and the inner peripheral surface of the space 08, exits to the bladder side port 06b, and is supplied into the bladder 4.

When the molding of the green tire is completed and the supply of the positive pressure air a from the bladder air supply device 5 is stopped, FIG.
As shown in (b), the pressure of the air b in the bladder 4 on the side to which air is supplied prevails, and the air b flowing into the space 08 of the quick exhaust valve 06 from the bladder 4 pushes down the valve element 011, and 011 presses against the inner end face 09 of the flow path 061a to close the supply port 06a, while the inner end face 0 of the flow path 062a is closed.
Since the space between 10 and the valve element 011 is open, the space 08 communicates with the exhaust port 06c, and the air b in the bladder is exhausted from the exhaust port 06c.

[0016]

When the rapid exhaust valve as described above is used, the speed can be increased by the capability of the air supply device when the positive pressure is supplied. It is inevitable that the pressure of the exhaust gas decreases with the evacuation and the evacuation speed decreases, which has been a problem in improving the efficiency of the operation of the rapid exhaust valve.

Particularly, in a tire molding machine, it is required to improve the production efficiency, that is, to reduce the time for the molding process. Therefore, it has been considered to add a negative pressure supply from the bladder air supply device 5, that is, an air suction step, after the certain exhaust step.

However, when the conventional quick exhaust valve 06 as described above is used, as shown in FIG. 3 (b), if the air c is to be sucked from the supply port 06a, the exhaust port 06c must be Outside air enters the space 08 and the valve element 011
Lip portion 011a is pressed against the inner peripheral surface of the space 08, the valve element 011 is sucked, and the inner end surface 09 of the flow path 061a.
And the supply side port 06a is closed, so that the air c cannot be sucked from the bladder side port 06b to the supply side port 06a.

Therefore, conventionally, in order to add a suction step, a separate suction line is provided to form a double piping system, or a double valve is used by combining the same quick exhaust valve 06 with the quick exhaust valve 06 and using a double pressure valve. A pipe that is interlocked alternately in the supply step (air supply step) and the negative pressure supply step (air suction step) is formed.

However, the internal space of the forming drum 2 of the tire forming machine 1 is narrow, and the conventional quick exhaust valve 06 has a box-shaped structure, which has a large external shape and is difficult to install. The configuration using a double valve has a problem that it is difficult to install the double drum in the forming drum 2. In addition, the bladder 4 is a consumable item, and replacement of the bladder unit may be required in some cases, and there has been a problem that the amount of work and difficulty of plumbing work accompanying the replacement become a heavy burden.

The present invention reduces the outer shape of the conventional rapid exhaust valve, facilitates installation, supplies positive pressure (supply air), exhausts air, and supplies negative pressure (suction of air). It is an object of the present invention to provide a quick exhaust valve which can also be operated and a tire forming machine provided with the quick exhaust valve.

[0022]

Means for Solving the Problems (1) The present invention has been made to solve the above-mentioned problems, and the first aspect of the present invention has been made.
Means, a supply side port connected to an air supply source, a supply side port connected to an air supply destination, an inner end face of a first flow path communicating with the supply side port, and the supply side port. A casing provided with a cylindrical space in which an inner end face of the second flow path communicating with the side port is opened to face the cylindrical bottom surface and an exhaust port communicating with the outside is formed on the cylindrical peripheral surface side; A valve body which is slidably inserted into a space between an inner end face of the first flow path and an inner end face of the second flow path in an axial direction and whose outer peripheral portion is in contact with the inner peripheral surface of the cylindrical space. And a sleeve mounted on the outer periphery of the casing and formed of an elastomer member that covers the exhaust port, wherein the valve element is configured to allow air to pass between the first flow path and the second flow path. A hole, which is in contact with the inner end face of the second flow path. Wherein the outer peripheral portion of the body closes the exhaust port and the outer peripheral portion of the valve body is set so as not to block the exhaust port when contacting the inner end surface of the first flow path. Provide exhaust valve.

According to the first means, when positive pressure air is supplied from the air supply source, the valve body is pressed against the inner end face of the second flow path, and the exhaust port is closed by the peripheral surface. The air passes through the through hole of the valve body, is supplied to the air supply side, and when the supply of positive pressure air from the air supply source is stopped, the pressure on the air supply side wins. The valve body is pressed against the inner end face of the first flow path, disengages from the exhaust port, the exhaust air pushes up the sleeve and is discharged, and when the air supply source supplies the negative pressure air (suctions the air), it passes through the through hole. Air is sucked in. At this time, since the sleeve blocks the exhaust port, no invasion of outside air occurs, and air is sucked efficiently without any problem. And air can be supplied at negative pressure in addition to air exhaust. And piping system, without using the device configuration using the double valve, by one quick exhaust valves,
An apparatus for performing the air suction step in addition to the air supply step and the exhaust step can be configured compactly. (2) As a second means, in the quick exhaust valve of the first means, the first flow path, the second flow path, and the cylindrical space are arranged on the same central axis. A quick exhaust valve is provided.

According to the structure of the second means, in addition to the function of the first means, the first flow path, the space, and the second flow path are linearly arranged along the same central axis. The quick exhaust valve has a linear outer shape, is extremely compact and easy to install, and is extremely easy to assemble and maintain, as compared with a conventional quick exhaust valve having a box structure.

(3) As a third means, in the quick exhaust valve of the first means or the second means, the air supply source supplies positive pressure air and negative pressure air to the bladder of the tire forming machine. And a bladder air supply device that supplies the bladder to a bladder of a tire forming machine.

According to the configuration of the third means, in a tire forming machine for supplying negative pressure air in addition to supplying and exhausting positive pressure air to the bladder, bladder air piping and a rapid exhaust valve in a narrow forming drum. Assembly and maintenance becomes extremely easy,
The action of the first means or the second means is more effective.

(4) As a fourth means, there is provided a tire forming machine characterized by connecting a quick exhaust valve of the third means between the bladder air supply device and the bladder of the tire forming machine. I do.

According to the structure of the fourth means, by the action of the high-speed exhaust valve of the third means, the tire forming machine can supply the positive pressure air to the bladder and supply the negative pressure air in addition to the exhaust air, thereby improving the manufacturing efficiency. Improvement, that is, the time required for the molding process can be reduced, and assembly and maintenance can be facilitated.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rapid exhaust valve according to an embodiment of the present invention will be described with reference to FIG. FIG. 1A is a side view of the rapid exhaust valve according to the present embodiment, and FIG.
(A) is a longitudinal sectional view of the rapid exhaust valve of the present embodiment, which is shown in the same direction as FIG.

The quick exhaust valve 6 of the present embodiment can be used in place of the conventional quick exhaust valve 06 shown in FIG. 2, and a tire molding machine equipped with the quick exhaust valve of the present embodiment is also shown in FIG. 2 is shown in the same manner as FIG.

As shown in FIG. 1, the quick exhaust valve 6 is formed by screwing a tubular supply side casing 61 and a bladder side casing 62 in series.

The supply-side casing 61 and the bladder-side casing 62 are provided with a flow path 61a as a first flow path and a flow path 62a as a second flow path, respectively, along their central axes. Then, the flow path 61a and the flow path 62a have the same center line.

A portion of the supply side casing 61 which is screwed with the bladder side casing 62 is formed so as to form a cylindrical portion 61c, and a cylindrical space 8 is formed inside the cylindrical portion 61c.
A flow channel 61a is provided at one center of the cylindrical bottom surface of the cylindrical space 8.
The inner end surface 9 of the flow path 62a of the bladder side casing 62 screwed with the supply side casing 61 is opened.
0 is open at the other center of the cylindrical bottom surface of the space 8 across the cylindrical space 8 so as to face the inner end surface 9.

The other end of the flow path 61a constitutes a supply side port 6a which opens to the outside, and the other end of the flow path 62a constitutes a bladder side port 6a which opens to the outside.
A screw portion 61b for pipe connection is formed on the outer periphery of a, and a screw portion 62b for pipe connection is formed on the outer periphery of the bladder side port 6b.

In the cylindrical space 8, a piece-shaped valve element 11 made of an elastic member such as rubber is provided.
Is slidably inserted between the inner end surface 9 and the inner end surface 10 in the axial direction of the space 8 while being in contact with the inner peripheral surface of the cylindrical member.

The valve body 11 is provided with a through hole 11a so that air can flow between the flow path 61a and the flow path 62a while receiving a certain degree of passage resistance. The valve body 11 comes into contact with the inner end face 9 of the flow path 61a when trying to flow from the flow path 62a to the flow path 61a. 3 (b), a valve element 1 indicated by a two-dot chain line
As shown by 1 ', it is moved and positioned so as to contact the inner end face 10 of the flow path 62a.

A plurality of exhaust ports 6c for communicating the space 8 with the outside are drilled in the cylindrical peripheral surface side of the cylindrical space 8, that is, in the cylindrical portion 61c of the supply side casing 61,
A cylindrical sleeve 7 formed of a flexible elastomer member such as rubber, synthetic rubber, or plastic is mounted on the outer periphery of the cylindrical portion 61c so as to cover the exhaust port 6c.

A groove 61d is formed circumferentially on the outer peripheral surface of the cylindrical portion 61c.
And one cylindrical end of the sleeve 7 is fitted and fixed.

The exhaust port 6c is connected to the valve body 11 shown in FIG.
As shown by the solid line in FIG. 3, when the valve body 11 is in contact with the inner end surface 9 of the flow path 61a, the valve body 11 is not closed by the outer peripheral surface 11b, and the valve body 11 'is closed as shown by a two-dot chain line in FIG. Channel 62
a, the outer peripheral surface 11 of the valve body
b.

The operation of the quick exhaust valve 6 in the case where the quick exhaust valve 6 of the present embodiment configured as described above is provided in a tire forming machine 1 as shown in FIG. 2 will be described below.

In forming a green tire, the positive pressure air a is supplied from the bladder air supply device 5 to the supply port 6a of the quick exhaust valve 6, and the positive pressure air a flows as shown in FIG. Although entering the space 8 from the path 61a, the valve body 11 slides in the space 8 by the positive pressure of the air a, is pressed against the inner end face 10 of the flow path 62a, and the exhaust port 6c is closed by the outer peripheral face 11b.

The air “a” entering the space 8 passes through the through hole 11 a of the valve body 11, exits through the bladder side port 6 b, and is supplied into the bladder 4.

When the molding of the green tire is completed and the supply of the positive pressure air a from the bladder air supply device 5 is stopped, the pressure of the air b in the bladder 4 which is the air supply side wins, and the bladder 4 The air b flowing into the space 8 of the quick exhaust valve 6 from
Since the valve element 11 is slid and pressed against the inner end face 9 of the flow path 61a, the outer peripheral surface 11b of the valve element 11 is connected to the exhaust port 6c.
Get off.

Since the cylindrical sleeve 7 mounted so as to cover the outside of the exhaust port 6c is a flexible elastomer member, the air b pushes up the sleeve 7 and pushes between the cylindrical portion 61c and the sleeve 7, so that the exhaust is performed. The air b in the bladder is discharged from the port 6c. After a certain evacuation step in which the pressure of the air b in the bladder 4 is high and natural evacuation is efficiently performed, when the bladder air supply device starts supplying a negative pressure (suction of air), the valve element 11 closes the flow path 61a. The air c, which is pressed against the inner end surface 9 but is sucked, passes through the through hole 11a, and the bladder 4, the bladder side port 6b, the flow path 62a, the space 8, the through hole 11a of the valve body 11, the flow path 61a, and the supply side. The air c is sucked through the path of the port 6a.

Since the pressure in the space 8 is more negative than the outside atmospheric pressure, the sleeve 7 is pressed against the cylindrical portion 61c to block the exhaust port 6c. The suction of c is performed efficiently without any problem.

As described above, according to the rapid exhaust valve 6 of the present embodiment, the bladder 4 that is the air supply destination and the bladder air supply device 5 that is the air supply source are connected and provided. Bladder air supply device 5 by two quick exhaust valves 6
Of positive pressure (supply of air) to bladder 4 from
In addition to the exhaust of air from the air conditioner, a negative pressure can be supplied (air suction) from the bladder air supply device 5 to the bladder 4, and the efficiency of the tire forming process of the tire forming machine 1 can be improved.

The quick exhaust valve 6 of the present embodiment is constructed by combining tubular casings 61 and 62 in series and forming
1, the space 8, and the flow path 62 are arranged linearly along the same central axis, and therefore, the outer shape is linear and extremely compact, so that the installation in the forming drum 3 is easy, Without using a double piping system or an apparatus configuration using a double valve, the apparatus configuration for performing the air suction step in addition to the air supply step and the exhaust step can be made compact. The assembly and maintenance in the narrow forming drum 3 are also extremely easy.

Although the embodiment of the present invention has been described above, it is needless to say that the present invention is not limited to the above-described embodiment, and various modifications may be made to the specific structure within the scope of the present invention. .

For example, the sleeve 7 is made of an elastomer member that covers the exhaust port 6c from outside, and does not hinder the exhaust from the exhaust port 6c, and functions as a valve that prevents the outside air from entering from the exhaust port 6c. In the present invention, the "sleeve" is not limited to the cylindrical sleeve described in the embodiment, but may be a lip-shaped one having a slit between the exhaust ports 6c.

In the above-described conventional example and the embodiments of the present invention, the high-speed exhaust valve used for supplying, exhausting and sucking bladder air to the bladder of the tire forming machine has been described as an example. The exhaust valve is not limited to a tire molding machine, but can be applied as a high-speed exhaust valve to a device that supplies a negative pressure in addition to supplying and exhausting a positive pressure.

Of course, when the bladder is used for supplying, exhausting, and sucking bladder air to the bladder of the tire molding machine as described above, the operation and effect of the rapid exhaust valve and the operation and effect of the tire molding machine having the same are provided. Is more remarkably exhibited.

[0052]

(1) According to the first aspect of the present invention, the quick exhaust valve includes a supply port connected to the air supply source, a supply port connected to the air supply destination, and the rapid exhaust valve inside the supply port. An inner end face of the first flow path communicating with the supply side port and an inner end face of the second flow path communicating with the supply side port are respectively opened to face the cylindrical bottom surface, and communicate with the cylindrical peripheral surface side to the outside. A casing having a cylindrical space in which an exhaust port is formed; slidable axially in the cylindrical space between an inner end face of the first flow path and an inner end face of the second flow path; A valve body that is inserted into the outer peripheral portion and is in contact with the inner peripheral surface of the cylindrical space
A sleeve formed of an elastomer member mounted on an outer periphery of the casing and covering the exhaust port, wherein the valve body has a through hole through which air can pass between the first flow path and the second flow path. Wherein the outer peripheral portion of the valve body closes the exhaust port when contacting the inner end surface of the second flow path, and the outer peripheral portion of the valve body closes the exhaust port when contacting the inner end surface of the first flow path. Since the exhaust port is set so as not to be blocked, a rapid exhaust valve that can supply negative pressure air in addition to supplying positive pressure air and exhausting air is obtained. Alternatively, a single rapid exhaust valve can be used to compactly perform an air suction process in addition to an air supply process and an exhaust process without using a device configuration using a double valve. (2) According to the second aspect of the invention, in the rapid exhaust valve according to the first aspect, the first flow path, the second flow path, and the cylindrical space are arranged on the same central axis. As a result, in addition to the effect of the first aspect of the present invention, the external shape of the quick exhaust valve is linear, and it is extremely compact and easy to install as compared with the conventional quick exhaust valve having a box-type structure. Is also very easy.

(3) According to the invention of claim 3, claim 1
3. The rapid exhaust valve according to claim 2, wherein the air supply source is a bladder air supply device that supplies a positive pressure air and a negative pressure air to a bladder of the tire forming machine, and the supply destination is the tire forming machine. 4. Because the bladder is configured to be a bladder, in a tire forming machine that supplies negative pressure air in addition to supplying and exhausting positive pressure air to the bladder, bladder air piping within a narrow forming drum, assembly of a quick exhaust valve, Maintenance becomes extremely easy, and the effects of the first or second aspect of the invention are more effectively and significantly exhibited.

(4) According to the fourth aspect of the present invention, the tire forming machine is configured such that the rapid exhaust valve according to the third aspect is connected between the bladder air supply device and the bladder of the tire forming machine. With the effect of the high-speed exhaust valve according to the third aspect, negative pressure air can be supplied to the bladder in addition to supplying and exhausting positive pressure air to the bladder, thereby improving manufacturing efficiency, that is, shortening the molding process time. This makes it possible to obtain a tire molding machine that is easy to assemble and maintain.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a quick exhaust valve according to an embodiment of the present invention, wherein (a) is a side view of the quick exhaust valve of the present embodiment, and (b) is in the same direction as (a). FIG. 2 is a vertical cross-sectional view of the quick exhaust valve according to the present embodiment, and FIG. 2C is a front view of the valve body taken along line AA in FIG.

FIG. 2 is a schematic configuration diagram of a general tire molding machine.

FIG. 3A is a longitudinal sectional view of a conventional rapid exhaust valve, showing a state when air is supplied, and FIG. 3B is a state when air is exhausted.

[Explanation of symbols]

 Reference Signs List 1 tire molding machine 3 molding drum 4 bladder 5 bladder air supply device 6 quick exhaust valve 6a supply side port 6b bladder side port 6c exhaust port 7 sleeve 8 space 9 internal end face 10 internal end face 11 valve body 11a through hole 11b outer peripheral face 61 supply side Casing 61a Channel 61c Tube 61d Groove 62 Bladder side casing 62a Channel

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)

Claims (4)

[Claims] A supply port connected to a supply source of air, a supply port connected to a supply destination of air, an inner end face of a first flow path communicating with the supply port inside, and the supply port. A casing provided with a cylindrical space in which the inner end faces of the second flow passages communicating with the supply-side ports are respectively opened to face the cylindrical bottom surface and an exhaust port communicating with the outside is formed on the cylindrical peripheral surface side; A valve which is slidably inserted in an axial direction between an inner end face of the first flow path and an inner end face of the second flow path and whose outer peripheral portion is in contact with the inner peripheral surface of the cylindrical space. A body, and a sleeve formed of an elastomer member mounted on the outer periphery of the casing and covering the exhaust port, wherein the valve body allows air to pass between the first flow path and the second flow path. A valve having a through-hole, the valve being in contact with the inner end face of the second flow path; Wherein the outer peripheral portion of the body closes the exhaust port and the outer peripheral portion of the valve body is set so as not to block the exhaust port when contacting the inner end surface of the first flow path. Exhaust valve. 2. The quick exhaust valve according to claim 1, wherein
The rapid exhaust valve, wherein the first flow path, the second flow path, and the cylindrical space are arranged on the same central axis. 3. The bladder air supply device according to claim 1, wherein the air supply source supplies a positive pressure air and a negative pressure air to a bladder of the tire forming machine. , Wherein the supply destination is a bladder of a tire forming machine. 4. A tire molding machine comprising the rapid exhaust valve according to claim 3 connected between the bladder air supply device and a bladder of the tire molding machine.