CN210337002U

CN210337002U - Expansion sizing die before inner tube vulcanization

Info

Publication number: CN210337002U
Application number: CN201920630788.2U
Authority: CN
Inventors: 蒋延伟; 何长军
Original assignee: Weihai Runtong Rubber Co ltd
Current assignee: Weihai Runtong Rubber Co ltd
Priority date: 2019-05-01
Filing date: 2019-05-01
Publication date: 2020-04-17
Anticipated expiration: 2029-05-01

Abstract

The utility model discloses an inflation stock mould before inner tube of a tyre vulcanizes for solve attenuation, breach, the string scheduling problem at mouth dish edge. The scheme of adoption is that the decorative pattern is arranged on the sizing upper die and located at the edge of the valve disc, the quality problem of the edge of the inner tube valve is solved through the technology, the qualification rate of inner tube products is improved, and the problem of the disc edge crack of the valve in the use process of the inner tube is solved.

Description

Expansion sizing die before inner tube vulcanization

Technical Field

The utility model relates to an inner tube of a tyre makes the field, concretely relates to inner tube of a tyre inflation design mould before vulcanizing.

Background

In the production of the inner tube, the quality of the inner tube is directly influenced by the combination of the nozzle disc and the tube, the problems of pleating, cracking, local thinness, low tensile strength and the like of the edge of the nozzle disc easily cause air leakage and damage of the inner tube, and the quality and the service life of the inner tube are greatly influenced.

Before the inner tube is vulcanized, the inner tube needs to be expanded and shaped, and in the expansion process, as the expansion and the stretching of the rubber of the mouth disc and the rubber of the tube are different, the stress concentration is generated by the stretching, and the edge of the mouth disc is locally thinned, wrinkled or split due to the local stretching.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides an inflation stock mould before inner tube of a tyre vulcanizes is dedicated to through the improvement to the design mould to improve the child section of thick bamboo inflation effect at mouth rim of a plate, in order to improve the quality of inner tube of a tyre vulcanizes.

The utility model discloses the technical scheme who takes as follows: an expansion shaping die for an inner tube before vulcanization comprises an upper shaping die and a lower shaping die, wherein a V-shaped notch for installing an inflating valve is formed in the lower shaping die; the V-shaped convex part is provided with a pattern which is positioned on the edge of a valve disc of the valve.

Further, the pattern is uneven.

Further, the patterns partially cover the nozzle disc. Still further, the area where the pattern covers the nozzle disc is 1/4 nozzle disc radii extending radially inward from the edge of the nozzle disc.

Furthermore, the width of the pattern is 2/3-3/4 of the diameter of the nozzle disc.

Furthermore, the pattern is a grid pattern or scattering stripes which are diffused outwards from the edge of the mouth disk, and the pattern can also be in other shapes.

Furthermore, the height of the shaping lower die is higher than the die assembly center line, and a V-shaped notch is formed in the position higher than the center line.

Compared with the prior art, the beneficial effects of the utility model are embodied in: through the inner tube with the improved patterns, the molding expansion of the disc edge of the nozzle is uniform, and the problems of uneven molding expansion of the disc edge of the nozzle and thin disc edge of the nozzle are solved.

Drawings

The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout the drawings.

FIG. 1 is a schematic view of the pattern of an expansion sizing die before vulcanization of an inner tube.

Detailed Description

The present invention is described in detail with reference to the drawings and examples, but those skilled in the art should understand that the following examples are not the only limitations of the present invention, and all equivalent changes or modifications made in the spirit of the present invention should be considered as falling within the protection scope of the present invention.

As shown in fig. 1, the expansion shaping mold for the inner tube before vulcanization comprises an upper shaping mold 1 and a lower shaping mold 2, wherein a mold closing space a is formed when the upper shaping mold 1 and the lower shaping mold 2 are closed, the inner tube is placed in the mold closing space, and the shape of the inner tube is limited by the mold closing space of the shaping mold when the inner tube is inflated and formed, so that the inner tube cannot expand randomly.

In order to avoid the position of the valve, the height of the shaping lower die 2 is higher than the central line of the die assembly, so that the valve is arranged on the lower die, and a V-shaped notch is formed in the lower die and used for placing the valve. Correspondingly, the upper shaping die 1 is provided with the V-shaped bulge, and the V-shaped bulge is matched with the V-shaped notch of the lower die for die assembly, so that the advantage of forming the V-shaped matching surface B is favorable for die assembly.

The valve disc 3 of the valve is bonded on the tire tube in advance, because the valve disc is made of the boiled rubber and the tire tube is made of the raw rubber, when the tire tube is inflated and expanded, the stress concentration of a junction point can be generated at the bonding point of the valve disc and the tire tube due to different expansion and stretching, the tire tube at the edge part of the valve disc is most easily stretched and deformed, and particularly, the edge part of the valve disc becomes thinner by local stretching at the die assembly part of the valve. Therefore, the utility model adopts the method that the pattern C is arranged at the peripheral part of the nozzle disc of the shaping upper die 1, in particular to the pattern C is added at the V-shaped convex part, as shown in figure 1.

Due to the fact that the uneven patterns are arranged on the upper die, when the upper die and the lower die are assembled, the patterns C are reversely extruded on the tire tube along with expansion of the tire tube, and due to the existence of the patterns, partial expansion of the tire tube during shaping is blocked, so that expansion force is uniformly distributed, partial stretching thinning is avoided, and the problem that the edge of the nozzle disc becomes thin is solved.

Further, the pattern C partially covers the edge of the nozzle disc 3, i.e. a part of the pattern is pressed on the nozzle disc, as shown in the area D in fig. 1, so that the bonding part of the edge of the nozzle disc and the tire cylinder can be ensured not to be stretched and damaged.

Still further, the area of the pattern C covering the edge of the mouth disc 3 is about the depth extending radially inward from the edge of the mouth disc about the mouth disc radius 1/4.

Further, the pattern C has a width H of 2/3-3/4 of the diameter of the nozzle disc 3 on the upper die.

Further, the pattern C may be a grid pattern, a scattering stripe extending outward from the edge of the mouthpiece tray 3, or other irregular shapes.

The overall thickness of the patterned portion is uniform despite the uneven tube.

Through the improvement, the technical indexes of the inner tube are compared with those before the improvement as shown in the following table:

obviously, the utility model discloses improve the nozzle dish of the back inner tube of a tyre and the adhesive strength of a child section of thick bamboo and obviously improve, the qualification rate obtains very big improvement, easily shaping in the production is even with the shaping inflation, quality problems such as the interior tire nozzle dish edge is wrinkled, thin, the breach in having solved production, manufacturing cost has been reduced, economic benefits has been increased, also be the technological a further breakthrough of the inner tube of a tyre trade, the life of the inner tube of a tyre has not only been increased, the bad loss of product has been reduced, also worry about the difficulty of relieving for the cover tire producer simultaneously.

Claims

1. The utility model provides an inflation stock mould before inner tube vulcanization, mould and design lower mould on the design, its characterized in that: the shaping lower die is provided with a V-shaped notch for installing an air valve, the shaping upper die is provided with a V-shaped bulge, and the V-shaped notch and the V-shaped bulge are matched for die assembly;

the V-shaped convex part is provided with a pattern which is positioned on the edge of a valve disc of the valve.

2. The pre-cure expansion sizing die for inner tubes according to claim 1, characterized in that: the pattern is uneven.

3. The pre-cure expansion sizing die for inner tubes according to claim 1 or 2, wherein: the pattern partially covers the nozzle disk.

4. The pre-cure expansion sizing die for inner tubes according to claim 3, wherein: the area where the pattern covers the nozzle disc is 1/4 nozzle disc radii extending radially inward from the edge of the nozzle disc.

5. The pre-cure expansion sizing die for inner tubes according to claim 1 or 2, wherein: the width (H) of the pattern is 2/3-3/4 of the diameter of the nozzle disc.

6. The pre-cure expansion sizing die for inner tubes according to claim 1 or 2, wherein: the pattern is a grid pattern or scattering stripes which are diffused outwards from the edge of the filter disc.

7. The pre-cure expansion sizing die for inner tubes according to claim 1, characterized in that: the shaping lower die is higher than a die assembly center line, and a V-shaped notch is formed in the position higher than the center line.