Molded tape mold

Abstract

The present application provides a novel moulding tape mould, which has an air bag and an inner mould, the air bag is sealingly connected with the inner mould at the end, and the outer surface of the inner mould is provided with alternating ridges and grooves, the moulding tape mould designed by the present application can effectively improve the service life of the moulding tape mould and save a lot of manpower and material resources.

Description

Technical fields:

[0001] This invention relates to molding tape dies, and more particularly to the inner mold of molding tape dies. Background technology:

[0002] Transmission belts, especially those formed by molding, are well known, such as the molded multi-ribbed belt disclosed in Chinese publication CN103161879A, and refer to this specification. Figure 1 The following description illustrates the vulcanization process, which primarily utilizes a concentric cylindrical inner mold 1 and an outer mold 2. The inner mold 1 has an air bladder 4 made of flexible material such as rubber around its periphery, and the inner surface of the outer mold has a molding surface, such as a V-shaped wedge groove. Furthermore, a wound rubber sleeve 3 is placed into the inner cavity of the outer mold 2. The inner diameter of the rubber sleeve 3 is slightly larger than the outer diameter of the inner mold 1 with the air bladder 4. After the inner mold is inserted into the outer mold, high-pressure gas is injected between the inner mold and the air bladder. The air bladder expands, pressurizing the rubber sleeve and causing it to move towards the outer mold. The rubber sleeve undergoes vulcanization through the pressure and heat from the air bladder and outer mold. The vulcanized rubber sleeve is then removed and cut into multi-wedge strips according to the required width. This method of molding multi-wedge strips is already known, but currently, due to the frequent inflation and deflation of the air bladder, after repeated use, localized bulges appear in the air bladder, as described in the instruction manual. Figure 1 The deformation of the No. 5 airbag is too large, making it impossible to restore to its original state. After deflating, it does not conform to the outer wall of the inner mold in some areas, and the diameter increases, requiring frequent replacement of the airbag, which increases costs. If it is not replaced, due to the deformation of the airbag, when the inner mold enters the outer mold, the airbag contacts the rubber sleeve, causing the rubber sleeve to shift or tilt. After vulcanization, the rubber sleeve part is not formed or is not formed sufficiently, resulting in cutting and scrap. If the airbag deforms even more during further use, it cannot be placed into the outer mold, making production impossible. Therefore, it is urgent to solve this problem. Summary of the Invention:

[0003] To solve this problem, the present invention provides a novel molding die, comprising an air bladder and an inner mold, wherein the air bladder and the inner mold are sealed at the ends, and the outer surface of the inner mold has alternating grooves and protrusions.

[0004] Preferably, the groove and the ridge extend axially along the inner mold.

[0005] Preferably, the groove and the convex strip are arranged parallel to each other along the circumference of the inner mold.

[0006] Preferably, the grooves are the same size.

[0007] Preferably, the convex strips are all the same size.

[0008] Preferably, the convex strip is a convex tube disposed on the surface of the cylindrical structure.

[0009] Preferably, some of the grooves are connected to the surface of the cylindrical structure.

[0010] Preferably, some of the grooves are provided with air holes.

[0011] Preferably, the pores are located at both ends of the groove.

[0012] Preferably, the air holes located at both ends of the same groove are connected at least indirectly through an air pipe.

[0013] The molding die also includes an outer mold, the inner surface of which has a forming tooth structure.

[0014] The molding die is a multi-wedge molding die.

[0015] The molding die is a die for molding and cutting V-belts.

[0016] The molding die structure of the present invention can effectively improve the service life of the molding die, reduce the replacement frequency of the airbag, and at the same time improve production efficiency and reduce production costs. Attached image description:

[0017] Figure 1 A schematic diagram of the process of inserting the inner mold into the outer mold;

[0018] Figure 2 A schematic diagram of the inner mold of this invention;

[0019] Figure 3 , Figure 2 Sectional view of AA. Detailed implementation method:

[0020] like Figure 1 As shown, the molding die includes a cylindrical inner mold 1 and an elastic air bladder 4 disposed around the inner mold 1. The elastic air bladder 4 and the inner mold 1 are sealed at both ends of the inner mold 1 by a connecting component (not shown), forming a closed cavity between the elastic air bladder 4 and the outer surface of the inner mold 1. The outer surface of the inner mold 1 is provided with air holes 11 connected to air pipes. The molding die also includes an outer mold 2 disposed around the air bladder. The inner surface of the outer mold 2 is provided with a forming surface for forming the tooth shape required for the transmission belt. During transmission belt production, a rubber sleeve 3, which is stacked and wound into a cylindrical shape, is placed into the outer mold 2. Then, the inner mold 1 with the air bladder is placed into the rubber sleeve 3. High-pressure gas is introduced between the inner mold 1 and the air bladder 4 through the air pipe, causing the air bladder 4 to expand outward and compress the rubber sleeve 3 to move towards the outer mold 2. The rubber sleeve 3 is compressed by the air bladder and the outer mold. High-temperature steam is introduced into the inner and outer molds through steam pipes to vulcanize the rubber sleeve 3. After a certain period of time, the mold cools the rubber sleeve through a cooling system, and the rubber sleeve is formed. The trachea is deflated and a vacuum is created, causing the airbag to contract and return to its original position. The vulcanized rubber sleeve is then removed and cut to the required width.

[0021] like Figures 1-3As shown, in order to prevent the diameter of the local protrusion 5 from exceeding the production requirements after the airbag 4 has been used multiple times, several alternating protrusions and grooves are set on the outer surface of the cylindrical inner mold 1. When vacuuming, the excess part of the airbag after deformation and diameter expansion shrinks into the groove. Therefore, the overall diameter of the inner mold with the airbag remains unchanged, so the deformation of the airbag will not affect the subsequent vulcanization production of the rubber sleeve.

[0022] The ribs and grooves can be inclined or unevenly distributed, but for ease of manufacturing and uniform force distribution during airbag contraction, the ribs 14 and grooves 13 are alternately and evenly arranged along the circumference of the inner mold, and the grooves 13 and ribs 14 extend parallel to each other along the axial direction of the inner mold 1. The ribs 14 can be integrally formed with the inner mold 1, that is, a concave-convex structure is provided on the overall cylindrical inner mold. To improve process performance, the inner mold 1 preferably includes a cylindrical structure and ribs provided on the surface of the cylindrical structure. The ribs 14 can be convex tubes separately provided on the cylindrical structure, and the convex tubes together with the outer surface of the cylindrical structure form a groove structure.

[0023] The groove 13 is provided with air holes 11 that communicate with the air pipe. The elastic airbag 4 is placed on the outer periphery of the inner mold 1 and is sealed to the inner mold 1 at both ends of the inner mold axially by a fixing mechanism. When molding, high-pressure gas is supplied to the air pipe, and the airbag 4 expands outward into a cylindrical shape under force. The width and depth of the groove are set according to the elongation rate of the airbag required for different transmission belt lengths. To ensure that the airbag is subjected to consistent force when inflating or deflating, it is preferable that the grooves are of the same size and the convex strips are of the same size, and the convex strips and grooves are evenly arranged along the circumference of the inner mold. The air holes 11 on the groove 13 are also preferably evenly arranged at equal intervals along the circumference. To ensure the uniformity of gas flow between the airbag 4 and the inner mold 1 during deflating and vacuuming, and to prevent the airbag from partially adhering to the inner mold and obstructing the gas from escaping from other parts, thus affecting the airbag's contractility, it is best to provide an upper air hole 11 and a lower air hole 12 at the upper and lower ends of the groove, respectively, and the two air holes are at least indirectly connected through the air pipe. Preferably, the two air holes are connected through the same air pipe. To ensure complete gas extraction, multiple air holes can be evenly distributed within each groove.

[0024] Due to the limited internal space of the inner mold, too many air pipes would cause difficulties in arrangement, insufficient space, and increased costs. Therefore, it is preferable that at least some or all of the grooves are connected by gaps or channels on the outer surface of the inner mold. This allows only some grooves to have air holes connected to the air pipes, reducing the number of air pipes. For example, if groove 13 is an integral cylindrical structure and ridge 14 is a separate structure set on the surface of groove 13, then a gap is provided at the mating surface between ridge 14 and groove 13. If ridge 14 is welded to the surface of groove 13 of the integral structure, then ridge 14 is partially welded with gaps left in some sections to ensure that all grooves 13 are connected on the outer surface of the cylindrical structure.

[0025] Because the inner mold has grooves on its outer surface, even if the diameter of the airbag increases after repeated use, the outer circumference of the outer mold exceeds the diameter of the airbag. However, after the vacuum airbag contracts, the excess portion of the airbag's expanded diameter can be contained within the grooves of the inner mold, preventing the airbag from protruding beyond the set diameter of the inner mold. Therefore, the airbag will not bulge out of the ribs, and the diameter of the inner mold with the airbag can still meet production requirements. Thus, even if the diameter of the airbag increases, it can still be used normally, increasing the service life of the airbag.

[0026] The inner mold designed using this invention extends the service life of the airbag by more than double compared to existing technologies, based on the number of times the rubber sleeve is produced. At the same time, the rubber sleeve will not shift due to the airbag bulging, thus greatly reducing the scrap rate of the rubber sleeve after cutting. This also saves a lot of manpower and resources for replacing and manufacturing airbags, reducing production costs.

[0027] This invention can be applied to molded multi-wedge belts and molded cut-edge V-belts, but is not limited thereto. All transmission belt molds using the structure of this invention are included within the concept of this invention. At the same time, the upper and lower positional relationships in this invention are only described for ease of understanding based on the accompanying drawings and are not intended to limit the invention.

Claims

1. A molding die for a compression band, comprising a cylindrical inner mold and an elastic air bladder disposed around the periphery of the inner mold, the elastic air bladder and the inner mold being sealed and connected to each other at both ends of the inner mold via connecting components, forming a closed cavity between the elastic air bladder and the outer surface of the inner mold, characterized in that, The outer surface of the inner mold has alternating grooves and ridges, and at least some of the grooves are provided with air holes connected to air pipes. The grooves and ridges extend along the axial direction of the inner mold and are arranged parallel to each other along the circumferential direction of the inner mold. The air holes are located at both ends of the grooves. The molding belt mold also includes an outer mold, and the inner surface of the outer mold has a forming tooth structure.

2. The molding die as described in claim 1, characterized in that, The grooves are all the same size.

3. The molding die as described in claim 2, characterized in that, The protrusions are all the same size.

4. The molding die for compression bands as described in any one of claims 1 to 3, characterized in that, The convex strip is a convex tube set on the surface of a cylindrical structure.

5. The molding die as described in claim 4, characterized in that, At least a portion of the grooves are connected to the surface of the cylindrical structure.

6. The molding die as described in claim 1, characterized in that, The vents located at both ends of the same groove are connected at least indirectly through a vent tube.

7. The molding die as described in claim 1, characterized in that, The molding die is a multi-wedge molding die.

8. The molding die as described in claim 7, characterized in that, The molding die is a molded V-belt die with a slit edge.

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