CN217834389U - Air bag type vulcanizing mold - Google Patents

Abstract

The utility model discloses a solve and go up technical problem and provide a gasbag formula curing mold for vulcanize the tube-shape strip base, including rubber layer and fibre rubber layer, fibre length direction in the fibre rubber layer extends along the mould axial, and the rubber layer is located the inside and outside both sides on fibre rubber layer on thickness direction, and the fibre rubber layer is shorter than the rubber layer in mould axial direction, adopts the utility model discloses the gasbag formula curing mold of structure, the intensity of gasbag formula curing mold has conveniently increased, and on the other hand has balanced the stability of whole gasbag atress, has improved life, has reduced the circumstances of fracture and deformation and has improved the apron in the vulcanization kettle and the leakproofness of gasbag head simultaneously, the condemned circumstances of strip base that gas leakage caused has significantly reduced.

Description

Air bag type vulcanizing mold

Technical Field

The utility model relates to a drive belt production technical field especially relates to the used gasbag formula mould of vulcanization in-process.

Background

The drive belt plays an important role in the drive system. Over the years, with the continuous change of the technology, the production process of the transmission belt has different changes. From early casting to current vulcanization. In the vulcanization molding process, the air bag type vulcanization mold plays an important role. The mold is different from a steel mold, and is made of rubber materials, so that the air bag type vulcanizing mold can contract or expand to extrude a cylindrical belt blank of a transmission belt through pressure difference between the inner side and the outer side of the mold, and the belt blank is molded. The two ends of the partial air bag type vulcanizing mould are fixed at the end part of the inner mould or the outer mould, for example, the air bag type vulcanizing mould is fixed on an inner steel mould in patent documents of belt vulcanizing mould with publication number of CN 216182037U; or the patent application of the multi-wedge belt and the method for manufacturing the multi-wedge belt with publication number CN103161879A, the air bag type vulcanizing mould is fixed on the outer steel mould, and the air bag type vulcanizing mould has less problems because two ends are fixed. At present, as shown in figure 1, a standing type vulcanizing mold is provided, because a belt blank 4 of a transmission belt is wound on an inner mold 5, the inner mold is placed in a vulcanizing kettle 1 for vulcanization, an air bag type vulcanizing mold 3 is positioned at the periphery of the belt blank 4, and an inner plate 2 is placed at the end part of the air bag type vulcanizing mold for sealing. Because the two ends of the air bag type vulcanization mould are not fixed and the inner part and the outer part of the air bag type vulcanization mould are not relatively supported, air leakage and the like caused by high shrinkage are often caused, and the production quality of the transmission belt is influenced. Later applicants have invented patent No. CN213860231U, which proposes to add extending fibers in the axial direction or the circumferential direction to the rubber of a balloon mold, improving the strength of the mold to some extent. However, it is found that the air bag type vulcanizing mold has the conditions of end cracking and air leakage, and further improvement is urgently needed.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve the upper technical problem and provide an gasbag formula curing mould, including the rubber layer for vulcanize the tube-shape area base, gasbag formula curing mould still contains the fibre rubber layer, fibre length direction in the fibre rubber layer extends along the mould axial, the rubber layer is located on the thickness direction the inside and outside both sides on fibre rubber layer, the fibre rubber layer in mould axial direction weak point in the rubber layer.

Further, the fiber rubber layer is shorter at the top than the rubber layers on both sides.

Furthermore, the fiber rubber layer is 15-30 mm shorter than the rubber layer.

Further, the thickness of the fiber rubber layer is smaller than that of the rubber layers on both sides.

Furthermore, the thicknesses of the rubber layers on the two sides are the same.

Wherein, the rubber of the fiber rubber layer is ethylene propylene diene monomer.

Furthermore, the fibers in the fiber rubber layer are short fibers.

Furthermore, the short fiber is aramid fiber.

Further, the length of the short fiber is 0.3-10 mm.

Adopt the utility model discloses the gasbag formula curing mold of structure, the convenient intensity that has increased gasbag formula curing mold, on the other hand has balanced the stability of whole gasbag atress, has improved life, has reduced the circumstances of fracture and deformation and has improved the apron in the vulcanization kettle simultaneously with the leakproofness of gasbag head, the condemned circumstances of strip blank that gas leakage caused that has significantly reduced.

Drawings

FIG. 1 is a schematic view of a cylindrical strip vulcanization;

FIG. 2 is a schematic view of a bladder type curing mold.

In the figure: 1. a vulcanizing kettle, 2, a cover plate, 3, an air bag type vulcanizing mold, 4, a belt blank, 5, an inner mold, 31, an outer rubber layer, 32, a fiber rubber layer, 33, an inner rubber layer, 321 and fibers.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, and the present invention is only exemplary and explanatory and is not intended to limit the scope of the present invention.

As shown in fig. 1, a standing vulcanization mode is schematically shown, and the vulcanization mode is that a cylindrical belt blank 4 formed by rubber and a cord wound on a cylindrical inner mold 5 is put into a vulcanization kettle 1 together, an air bag type vulcanization mold 3 is sleeved on the belt blank, the bottom of the air bag type vulcanization mold 3 is put on a bottom plate in the vulcanization kettle 1, a cover plate 2 is covered on the end part of the air bag type vulcanization mold 3, the vulcanization kettle is closed, and high-temperature high-pressure gas is introduced for vulcanization. After vulcanization, the belt blank 4 is cooled and taken out to be ground, cut and the like, thereby finally forming the transmission belt.

As shown in fig. 2, the air bag type vulcanizing mold 3 includes a rubber layer and a fiber rubber layer 32, and the length of the fiber 321 in the fiber rubber layer extends along the axial direction of the mold, so as to increase the axial strength of the air bag type vulcanizing mold 3, and facilitate reducing the axial shrinkage and facilitating the sealing. The rubber layers are located radially inside and outside the fiber rubber layer 32 in the thickness direction of the mold and include an outer rubber layer 31 and an inner rubber layer 33, and the fiber rubber layer 32 is located between the outer rubber layer 31 and the inner rubber layer 33 and is shorter at the top end than the outer rubber layer 31 and the inner rubber layer 33.

In the conventional production, the outer rubber layer 31, the inner rubber layer 33 and the fiber rubber layer 32 are formed by winding a plurality of thin rubber sheets, and 3 to 10 thin rubber sheets are required for each layer as required. For example, the inner rubber layer 33 is wound with 5 to 7 layers of thin rubber sheets, then wound with 3 to 5 layers of thin sheets containing fibers, and then wound with 5 to 7 layers of thin rubber sheets, the width of the thin sheet containing fibers in the middle is 15 to 30 mm shorter than the width of the thin rubber sheets at the two sides, and the other ends are aligned. The formed air bag type vulcanization mould 3 forms a structure that the rubber layers on the two sides are arranged, the fiber rubber layer is arranged in the middle of the rubber layers, and the top position of the fiber rubber layer is shorter than that of the rubber layers on the two sides. Preferably, the thickness of the middle fiber rubber layer 32 is thinner than the rubber layers on both sides, so that the air bag type vulcanization mold 3 is prevented from being too high in strength and easily cracking after expansion or contraction. Further, the fiber rubber layer 32 is located at the middle position, and the thickness of the rubber layers on both sides is the same. Multiple times of comparison shows that the fiber rubber layer 32 is positioned on the inner side, and the whole air bag type mold is easy to deform towards the outer side, namely the opening is enlarged; the fiber rubber layer is positioned at the outer side and deforms towards the inner side, namely the opening is reduced; the fiber rubber layer is positioned in the middle position, so that the stress stability of the whole air bag type mould is balanced, and the air bag type mould 3 has good condition in use. Because the top need with 2 cooperations of apron, and the utility model discloses weaken gasbag formula curing mold 3's intensity at the tip, more do benefit to mould contact apron, avoid the sealed bad circumstances such as steam leakage that cause, reduced scrapping of area base.

The rubber in the rubber layer and the fiber rubber layer can be the same rubber, such as ethylene propylene diene monomer rubber commonly used in the market. The rubber in the rubber layer may also be other rubbers commonly used in the art. The fiber rubber layer 32 is formed by mixing short fibers 321 for increasing strength into rubber of the rubber layer. The short fibers may be: aramid staple fibers, nylon 66 staple fibers, polyester staple fibers, ultrahigh molecular weight polyolefin staple fibers, polyarylate staple fibers, cotton, glass staple fibers, carbon staple fibers, and the like. The short fibers may be used alone or in combination of two or more. The average fiber length of the short fibers may be, for example, about 0.3 mm to about 10 mm, and more preferably about 1 mm to about 5 mm. High strength aramid staple fibers are preferred. 10 to 40 parts of short fiber is added in per 100 parts by mass of rubber. The direction of the fiber is obtained by orientation during rolling after mixing and then cutting.

The position relationships in the present invention, such as the relationship between the top, the radial direction, the height, the thickness, etc., are only described according to the placement of the drawings and the conventional descriptions, and are only for better understanding of the present invention, and are not intended to limit the present invention.

Claims (9)

1. The air bag type vulcanization mold comprises a rubber layer and is used for vulcanizing a cylindrical belt blank and is characterized by further comprising a fiber rubber layer, the length direction of fibers in the fiber rubber layer extends along the axial direction of the mold, the rubber layer is located on the inner side and the outer side of the fiber rubber layer in the thickness direction, and the fiber rubber layer is shorter than the rubber layer in the axial direction of the mold.

2. A bladder vulcanization mold as in claim 1 wherein said fiber rubber layer is shorter at the top than said rubber layers on both sides.

3. A bladder vulcanization mold as in claim 2 wherein said fiber rubber layer is 15 to 30 mm shorter than said rubber layer.

4. A bladder type vulcanizing mold as defined in claim 1, wherein the thickness of said fiber rubber layer is smaller than the thickness of said rubber layers on both sides.

5. A bladder type vulcanizing mold as defined in claim 4 wherein said rubber layers on both sides have the same thickness.

6. The bladder vulcanization mold of claim 5 wherein the rubber of the fiber rubber layer is ethylene propylene diene monomer.

7. A bladder vulcanization mold according to claim 6 wherein the fibers in said fibrous rubber layer are short fibers.

8. A bladder curing mold as in claim 7 wherein said staple fibers are aramid fibers.

9. A bladder curing mold as in claim 8, wherein said short fibers have a length of 0.3 to 10 mm.

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