Transmission belt vulcanization mold

Abstract

The invention provides a new transmission belt vulcanization mold, which comprises an outer mold, an inner mold and a core shaft which is an integrated structure composed of an upper cover plate and a shaft, the contact surface between the upper cover plate and the outer mold has a step structure, and a double sealing structure is arranged on the step structure, which standardizes the sealing ring specifications of the transmission belt vulcanization mold and improves the sealing effect of the mold.

Description

Technical Field

[0001] The invention relates to a transmission belt vulcanization mould. Background Art

[0002] Due to the variety of transmission belt specifications, the mold specifications of the transmission belt are different, which in turn leads to different sizes of sealing rings, making it difficult to manage. In particular, the small molded multi-V belts widely used in cameras, printers and other equipment have a diameter of approximately 50mm to 240mm. Due to the wide variety and different sizes, the vulcanization molds have multiple specifications, and the size of the sealing strip is the same. Therefore, most of them currently use the mode of on-site cutting of sealing strips for sealing, which makes the sealing strips difficult to manage and select, and there are great safety hazards in the cutting process; on the other hand, on-site cutting of sealing strips increases the labor intensity of workers and reduces production efficiency; at the same time, it is found that the scrap rate of transmission belt products is very high during the production process. According to statistics, the scrap rate is about 10%, which undoubtedly increases the production cost of the factory.

[0003] Therefore, it is urgent to provide a new vulcanization mold, which can solve at least one of the above problems. Summary of the invention

[0004] In order to solve the above technical problems, this utility adopts the following specific solutions to achieve:

[0005] A transmission belt vulcanization mold comprises an outer mold, a core shaft, an upper cover plate and the core shaft. The core shaft is an integrated structure consisting of the upper cover plate and the shaft. The contact surface between the upper cover plate and the outer mold has a step structure formed by the side surface, end surface and bottom surface.

[0006] A sealing structure is arranged on the step structure.

[0007] In order to standardize the size of the sealing ring, sealing structures are arranged on the end face and side face of the step structure.

[0008] To improve the sealing effect, the sealing structure includes an O-ring.

[0009] The sealing ring is placed in a sealing groove on the upper cover plate or the outer mold.

[0010] For easy installation, the sealing structure at the end face is that the outer mold has a sealing groove, and the sealing ring is placed in the sealing groove of the outer mold.

[0011] The sealing structure at the side is that the upper cover plate has a sealing groove, and the sealing ring is placed in the sealing groove of the upper cover plate.

[0012] This drive belt is a small molded drive belt.

[0013] The integrated structure is an integrated structure formed by welding the upper cover plate and the shaft.

[0014] The mold with the structure of the present invention can standardize the size of the sealing ring and facilitate management. On the other hand, the double sealing structure is adopted to improve the sealing effect of the vulcanization mold, reduce vacuum leakage, and improve the forming rate of the transmission belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the mold structure of the present invention.

[0016] Figure 2 for Figure 1 A partial enlarged view of area A in the middle. DETAILED DESCRIPTION

[0017] like Figure 1 The figure shows a vulcanization mold for a molded multi-V belt, which includes an outer mold 1, an inner mold 2 placed inside the outer mold, and a mandrel 5. The mandrel 5 is composed of a shaft 3 and an upper cover plate 4. The above parts are basically cylindrical, and a cavity structure for accommodating the belt blank is formed between the inner mold and the outer mold. The mandrel 5 composed of the upper cover plate 4 and the shaft 3 is integrally formed, and can also be connected as a whole by welding or other methods to prevent gaps from appearing at the connection between the upper cover plate 4 and the shaft 3, thereby reducing the probability of gas leakage.

[0018] The axial end of the outer mold 1 contacts the upper cover plate 4 of the mandrel 5. Figure 1 The contact surface between the outer mold 1 and the upper cover plate 4 is a step structure, which includes an end face 6 at the joint of the horizontal surface, a side face 7 at the joint of the vertical surface, and a bottom face 8 of the other joint surface. The radial contact surface size of the bottom face 8 is adjusted according to the size of different mold diameters, so that the sealing structure is set on the end face or the side face, so that the sealing ring size of the mold within a certain diameter size range is as uniform as possible, so as to achieve the maximum optimization of the sealing ring structure. For small-scale molded multi-V belt molds with a large size range and a large number, 3 to 7 types of O-rings with fixed specifications and fixed diameters can be designed. On the one hand, the single sealing structure of the end face or the side face or the double sealing structure of the end face and the side face reduces the leakage at the joint. At the same time, the O-ring also reduces the on-site cutting process, which not only reduces the labor intensity but also improves the work efficiency. At the same time, the types of sealing rings with fixed diameters and specifications are reduced from dozens of types to several types, which is also convenient for the effective management of the sealing rings and improves the on-site working environment.

[0019] In this specific embodiment, a toothed structure 11 is arranged on the outer mold 1, and an airbag 9 is arranged on the inner mold 2. A cavity 10 is formed between the outer mold 1 and the airbag 9. A belt blank (not shown) is placed in the cavity 10. During the vulcanization process, the airbag 9 expands outward, extruding the belt blank toward the outer mold 1, and then the belt blank is deformed, and the outer surface is completely in contact with the toothed structure 11 on the outer mold 1, forming the ribs of the transmission belt. To ensure that the teeth are completely in contact, the cavity 10 is vacuum. If the gas outside the mold enters the cavity 10 during production, the belt blank cannot be tightly fitted with the toothed structure 11, and the tooth surface of the transmission belt is poorly formed after vulcanization, causing the transmission belt to be scrapped. To prevent this from happening, this specific embodiment provides a multi-layer sealing structure on the contact surface between the outer mold 1 and the upper cover plate 4 of the core shaft 5 to reduce or avoid vacuum gas leakage. To standardize the size of the sealing ring, such as Figure 1 and Figure 2 As shown, preferably, a sealing structure is provided on the end face 6 and the side face 7 of the step structure. The sealing structure is provided in the form of a sealing groove and a sealing ring. A sealing groove is provided on the outer mold 1 and / or the upper cover plate 4. The sealing ring is placed in the corresponding sealing groove and is in interference contact with the matching parts. For the convenience of operation, as shown in FIG. Figure 2 As shown, the sealing groove 12 at the end face 6 is preferably arranged on the outer mold 1, the sealing groove 12' at the side face 7 is arranged on the upper cover plate 4, and the two sealing rings 13 and 13' are respectively placed in the corresponding sealing grooves. Due to the use of a step structure joint surface and a double-layer sealing structure, the pressure gradient of the sealing cavity is reduced, the sealing effect of the mold is improved, and the forming rate of the transmission belt is improved. In other embodiments, the specific structure of the inner mold and the outer mold of the mold, and the production of the product can also adopt other forms.

[0020] Therefore, the mold with the structure of the present invention can standardize the size of the sealing ring on the one hand, and improve the sealing effect on the other hand.

[0021] The horizontal planes, vertical planes, etc. written in this patent are all descriptions based on the placement of the drawings, which are mainly for the convenience of describing and understanding the invention, and are not limitations of the invention.

Claims

1. A transmission belt vulcanization mold, comprising an outer mold, an inner mold, an upper cover plate and a core shaft, wherein the core shaft is an integrated structure consisting of an upper cover plate and a shaft, wherein the contact surface between the upper cover plate and the outer mold has a step structure formed by the side surface, end surface and bottom surface, wherein a sealing structure is arranged on the step structure, and a sealing structure is arranged on the end surface and / or side surface of the step structure.

2. The vulcanization mold according to claim 1, characterized in that: The sealing structure comprises an O-ring.

3. The vulcanization mold according to claim 2, characterized in that: The O-type sealing ring is placed in a sealing groove on the upper cover plate or the outer mold.

4. The vulcanization mold according to claim 3, characterized in that: The sealing structure at the end face is that the outer mold has a sealing groove, and the sealing ring is placed in the sealing groove of the outer mold.

5. The vulcanization mold according to claim 4, characterized in that: The sealing structure at the side surface is that the upper cover plate has a sealing groove, and the sealing ring is placed in the sealing groove of the upper cover plate.

6. The vulcanization mold according to claim 1, characterized in that: The transmission belt is a small molded transmission belt.

7. The vulcanization mold according to claim 1, characterized in that: The integrated structure is an integrated structure formed by welding the upper cover plate and the shaft.

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