FI122100B - Curing mold venting valve - Google Patents

Description

VACUUM CLEANER VENTILATION VALVE

TECHNICAL FIELD The present invention relates to a dewatering valve for extracting air from a fluidized bed mold.

the slime outlet valve has an air-ducting body and a longitudinally movable inner member comprising a shaft having an outer diameter 10 smaller than the inner diameter of the body, and an inner end of the valve disc on the fashion side of the valve having a larger diameter than the inner diameter of the body.

The valve disc rests on the abutment face on the run-15 gore in the shut-off position of the bleed valve and is in the open position at a clearance from said abutment face.

In addition, the venting valve is provided with a flexible structure for forcing the inner member into a predetermined position, in particular to open the venttit-20 fin when the blank is removed from the fluidized bed mold.

Prior art

Vulcanization molds for vehicle tires utilize vent holes or ducts because, in vulcanizing a tire, an annular blank smaller than the inner dimensions of the mold is inserted into the mold, then closed, and then closed to expand the mold to press against the mold surface. When closing the vulcanizing mold, the air between ό 30 and the mold surface must be removed to allow the surface of the mold to come in close contact with the mold surface. There must be a number of these vent holes or ducts, so that the air is completely exhausted from every point of the mold and no glue pockets are left between the ring and the mold.

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En 8 35 EP 0 774 333 and US 4,347,212 disclose an air vent valve used in air vent ducts in vulcanizing molds for vehicles, having an inside air duct smaller than the duct diameter and a valve plate which is attached to the rod 2 and is located on a die. within the precincts of. The inside of the mold has a recess for the valve plate. A helical spring is disposed about the arm, which is supported by the mold and the valve seat, either directly or through the arm and a flange attached thereto. The spring tends to press the valve plate away from the mold wall towards the annular blank, whereby air is discharged from the mold through the gap between the valve plate and the counter-recess, and further through the gap between the shaft and the duct. As the expandable material advances toward the mold surface as it expands, it further pushes against the valve plate, which is then pressed tightly into the counter-recess, thereby closing the air duct so that the material to be vulcanized does not enter the duct. 10 The spring then opens the valve as the tire blank is removed from the mold.

A drawback of the known deaeration valves is, in particular, their complex construction and, in particular, the complexity of their internal components and their difficult installation. The air vent valve of U.S. Pat. No. 4,347,212 has no actual body and attachment occurs at the rear of the mold. It has a nut at the bottom, locking the valve stem in place. The valve cannot be replaced without removing the entire valve from the mold, or it is extremely difficult to replace the valve. In the solution of EP 0 774 333, on the other hand, the shaft is slightly longer than the duct for venting, and due to the valve slider disassembly potential, the response is realized by a 20-gap snap-on connection In these known solutions, the valve cannot be replaced without removing the entire valve from the mold, or it is extremely difficult to replace the valve. In the solution of EP 0 774 333, changing the valve is relatively difficult.

Deaeration valves are also disclosed in WO 2007139523, JP 2006150602 and Fl 119626 B. δ

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SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the drawbacks of the prior art and to provide a completely new type of air vent valve used in vulcanization of vehicle tires.

S In the solution according to the invention, the inner part of the valve has a single 05 § 35 piece which is compressible in the longitudinal direction, whereby the blank presses

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valve plate and causes the valve to close by means of a collapsible arm. Compression causes a spring force on the shaft that opens the valve when the mold is opened and the ring is removed from the mold.

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The compressible arm portion has annular, tubular or rod-shaped portions which may compress the merit of the compressive force and then provide that spring force.

The solution according to the invention provides the following advantages: - The solution 5 is simple, contains very few parts and is reliable.

The features of the solution according to the invention are described in detail in the appended claims.

Brief Description of the Drawings

The invention will now be described in more detail by way of example with reference to the accompanying drawing, in which Fig. 1 is a perspective view of a suction drain valve in accordance with the invention, Fig. 2 is a view of a body.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE INVENTION 20

The inside surface of the vulcanizing mold of the vehicle tire provides the vulcanized tire with the shape of its outer surface and the tread pattern with details in the area of the tread. Thus, the vulcanization mold in the mold surface which forms the tread has, inter alia, recesses forming grooves and treads forming tread grooves. The vulcanization mold has a plurality of air vent valves 1 having a cylindrical body 2 having a smooth outer surface or with external threads, which form an air outlet duct, which is preferably located both in the tread area and in the patterns not visible in the tire sidewalls. The air ducts extend from the vulcanization

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q 30 through the mold wall from inside the mold to the outside of the mold.

00 Ventilation valves 1 are for vulcanizing vehicle tires

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£ in molds depending on tire size and type. For example, summer tires for SUVs typically have between 700 and 900 tires and winter tires between 2000 and 2400 sections.

§ 35 The deaeration valve 1 has a cylindrical body 2 which acts as an air duct and has a longitudinally movable inner part 3 comprising a rigid shaft portion 4 having an outer diameter D4 smaller than the inner diameter of the housing 4 and an upper surface 4 of the valve plate 5 The center line of the arm portion 4 is straight and is also located inside the body 2, which is straight from the center line, and the length of the arm is the same as the length of the body, allowing the arm to move freely in the body.

The valve disc 5 rests in the closing position of the venting valve 1 - 5 on the stop face of the body and is in the open position at a clearance from said stop face,

In addition, the inner portion has, after the stem portion 4, one or more longitudinally compressible, successive stem portions 6-10 (Figs. 1 to 6) which may be annular, spherical and / or rod-shaped. They are flat, and 10 pieces. the lower end of the structure has a plate.

The straight and rigid shaft portion typically has a length of 1-8 mm and the collapsible portion 6-10 has a length of 1-20 mm so that the total length is typically 2-23 mm.

The compressible, successive shaft portions 6 to 10 may be all similar to, or different, for example, as shown in Fig. 1, in which the diameter of the ring increases downwards and the others are circular but the lowest is mainly oval. .

The bleed valve 1 according to the invention operates to remove air from the vehicle tire vulcanization mold during tire vulcanization in the following intervals:

An annular blank is placed in the vulcanization mold, which is made to expand by pressing air and / or steam into it, whereby the outer surface of the annular blank presses against the mold surface to give it its final surface shape, i.e. the tread pattern of the tire. At the same time, the vulcanization mold is heated to vulcanize the rubber material of the annulus gas blank and obtain the finished tire. In order to position the outer surface of the annular blank as closely as possible against the inner surface of the mold, air is vented between the annular blank and the mold surface via the venting valves, vent ducts according to the invention and their possible extensions.

q 30 In order to install the vent valve in the solution of the invention, the valve body must be removable and the valve may be mounted from the front,

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I.e., on the opposite side of the mold, either by squeezing or then twisting, whereby the valve body may have an outer sleeve 12 on its outside for tightening / opening.

G> § 35 The valve works as follows: The blank presses on the valve disc 5 and causes the 0X1 ring, ball or rod shaped arm sections to bend (squeeze), which allows the valve to close. Compression generates an arc spring force which, when the mold is opened and after the ring is removed from the mold, causes the valve to open.

The inside of the valve may be plastic or metal and may be made by rapid prototyping, molding or the like, and may, for example in the case of plastic, have a reinforcement ring 13 according to Fig. 3 with positioning holes 14 at the edge.

It will be apparent to one skilled in the art that the various embodiments of the invention are not limited to the above example, but may vary within the scope of the following claims,

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Claims (3)

1, Evacuation valve (1) for evacuating a vehicle tire mold or the like, which evacuation valve is provided with a body (2) and a longitudinally movable inner part (3) thereof which comprises a shaft whose outer diameter is smaller than that of the body. inner diameter and a valve plate (5) in the inner end of the shaft facing the mold surface, the diameter of the valve plate is more acidic than the inner diameter of the body, which valve plate (5) in the closed position of the evacuation valve (1) supports an abutment surface in the body and in the open position. at a distance from the abutment surface equal to the valve clearance, and the evacuation valve (1) is provided with an elastic structure forcing the inner portion to a predetermined position, in particular opening the valve to its open position when the blank is removed from the vulcanized mold, where the inner portion (4, 6) -10) is made in one piece and consists of a rigid shaft part closest to the ventiita lyric and one or a plurality of compressed compressible shaft portions (6-10) and one end disposed therewith, which ventif is arranged to operate such that when the blank in a tire or the like presses against the valve disc (5) the compressible shaft portions are pressed (6-10) together, allowing closure of the valve (1), and the compression providing a spring force which, when the mold is opened and the tire blank or the like "removed from the mold, opens the valve (1), characterized in that the compressible shaft members ( 6-10) are annular where the diameter of the ring or cross-section grows down. Evacuation valve according to claim 1, characterized in that the body of the valve (1) is removable and the valve can be mounted from the front, ie. from the opposite side of the mold either by pushing or turning, whereby the "valve body on the outside is provided with a light ring (12) which improves the grip £ when turning. 00 § 35 3. An evacuation valve according to any of the preceding claims, characterized by (M that the compressible shaft parts or at least some of them are flat.