JPS5831733A - Vulcanizing machine for transmission belt - Google Patents

Abstract

PURPOSE:To produce a transmission belt having a preset length of the circumference, by forming the upper and lower parts of a cylindrical drum of a vulcanizing machine for a transmission belt into a conical pedestal shape, and associating them with a flexible jacket having at the upper and lower inner circumferential edges flanges in the shape of a triangle in cross section. CONSTITUTION:The flexible jacket 2 having the flanges in the shape of a triangle in cross section at the upper and lower inner circumferential edges is mounted around the outer circumferential surface of the cylindrical drum 1 whose upper and lower parts have a frustum shape, and an unvulcanized belt sleeve 4 that is flat and wide is wound over the flexible jacket 2. An upper lid 6 is placed on an upper circumferential mold 5 having a plurality of grooves in the inner circumferential surface to seal the mold 5. Then, a high pressure steam is filled in an inner mold drum 1, and while the flexible jacket 2 is gradually inflated, the unvulcanized belt wound on it is pushed to the grooves (g) of the outer cylindrical mold. After the vulcanization, the flexible jacket 2 is shrunk, the belt is removed, and it is severed to obtain several V-belts.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly applies to poly V belts (in addition to poly V belts,
In the manufacturing process of belts, the patterning appearance of the surface 9' is made good, and the tensile elements are arranged uniformly without waves in the lateral direction, making it possible to efficiently and economically produce products of good quality with a constant belt section. This relates to a power transmission belt vulcanizer for obtaining

Conventionally, to manufacture poly V belts, the outer circumferential surface of a cylindrical drum is usually coated with rubber canvas, a thin unvulcanized adhesive rubber sheet, a spiral tensile rope, and an unvulcanized rubber sheet of a certain thickness. A wide unvulcanized belt sleeve is quickly formed by winding it endlessly, vulcanizing it together with the drum, and then cutting the belt sleeve surface with a grinder having a triangular cross section to form multiple lips. A method has been used to obtain multiple poly V belts by cutting them into a predetermined width in the circumferential direction, but this method not only becomes uneconomical as the rubber cut off after vulcanization becomes scrap. However, there is a problem in that even if a slight vibration occurs when the grinder rotates, the lip cannot be formed accurately.

Therefore, in order to solve the problem, we decided to
A wide cylindrical unvulcanized belt sleeve as disclosed in Publication No. 30621 is inserted into the inner surface of a ring mold in which a plurality of V grooves are carved on the inner peripheral surface, and flanges having a triangular cross section are formed on the upper and lower portions of the inner surface. A flexible cylindrical backing is installed inside, the top and bottom are sealed, high pressure steam is sent into the backing, and the pressing force is used to press the surface of the unvulcanized belt sleeve into the V-groove of the ring mold to form a bo+J. There is also a vulcanization method that forms a Y-belt, but this method requires a step of molding the unvulcanized belt sleeve on a separate drum, then removing it from the drum and inserting it into the inner surface of the ring mold. If the molding circumference of the sleeve is not constant and the molding section is longer than the ring mold, it will not only be difficult to insert it into the inner surface of the ring mold, but also when pressing and curing the unvulcanized belt sleeve through the backing, the tensile material layer This causes problems such as waves in the belt lateral direction, elongation of the belt when the belt is driven, vibration of the belt, and separation from the pulley.On the other hand, if the forming section of the unvulcanized belt sleeve is short, Although there is no problem with the tensile material waving, there is a problem in that the shape of the V-shaped groove on the belt surface cannot be accurately molded, and in addition, since the flexible unvulcanized belt sleeve is inserted alone into the ring mold, the sleeve There are various problems such as difficulty in maintaining the shape of the product itself and the product losing its shape.

The present invention has been devised to address these conventional problems and to make the circumferential length of the vulcanized belt constant and form a V-shaped tube accurately.The present invention is characterized by the following. aims to improve the vulcanization method described in the above-mentioned Japanese Patent Publication No. 45-30621, simplify the installation of a flexible jacket on the outer circumferential surface of the inner cylindrical drum, and increase the reliability of the seal on the upper part of the inner cylindrical drum. The belt vulcanizer is configured to form a plurality of lips while vulcanizing the surface of the vulcanized belt sleeve.

Hereinafter, the power transmission belt vulcanizer and its vulcanization mechanism according to the present invention will be described in detail.

FIG. 1 is a cross-sectional view showing the state before vulcanization of the belt vulcanizer according to the present invention, and FIG. 2 is a cross-sectional view showing the state after vulcanization and curing. ) is an internal hollow cylindrical drum made of iron with a truncated cone shape at the top and bottom, and inside this drum there is a backing fixed to the upper surface (1) of the drum (fluid supply and discharge pipes connected via ψ). (K1)
The tip of the drum is attached so that it opens through the outer peripheral wall of the drum, and is placed on a base (3), and a flexible jacket (2), which will be described later, is attached to the outer periphery of the base (3). The flexible jacket (2) is a cylindrical flexible jacket made of an elastic material such as rubber that can be expanded and contracted, and its upper and lower peripheral edges fit into the upper and lower truncated conical surfaces of the inner cylindrical drum (1). It forms boxwood (J), (J) with a triangular cross section,
This boxwood (-r), (J5 is the inner drum (1)
The drum (1) is fitted onto the outer peripheral surface of the drum (1) by fitting into the truncated conical portion of the drum (1). Therefore, the flexible jacket (2) and the inner cylindrical drum (1) are normally maintained in a sealed state.

On the other hand, (4) in the figure is an unvulcanized belt sleeve formed by reverse molding, and has a rubberized canvas (0) on the outer peripheral surface of a flexible jacket (2) attached to the inner drum (1).

Thin adhesive rubber sheet (R), low elongation, high strength tensile rope made of polyester or laryamide fiber (T
) and compressed rubber side) are wrapped in an endless manner and flattened □
It is formed in the shape of

-The inner cylindrical drum (1) constructed as described above has a plurality of V-shaped grooves engraved on its inner circumferential surface, and is equipped with a heater, a steam pipe, etc. inside. An outer cylindrical mold (5) equipped with a heating mechanism (not shown) such as
It is fixed on the base (8) at certain intervals.

Note that this outer cylindrical mold (5) is normally a cylindrical body that cannot be divided, but as shown in Fig. 3, it can be divided into two parts in the axial direction, for example, (D) and (D). It can also be made divisible into

Further, as shown in the figure, a disc-shaped upper cover (6) is placed on the upper surface of the inner drum (1) and outer cylindrical mold (5) having the above-mentioned configuration, and the cylindrical mold (5) is This fixing means includes, for example, dovetail grooves (4) and (G) carved on the lower surface of the upper lid (6) and an inverted trapezoidal protrusion provided on the upper surface of the outer mold (5). The top cover (6) is fixed by fitting it with the top cover (6) or by fastening it with bolts or other tightening means.
Means are taken to seal the upper surface (1) of the inner drum as well as the upper triangular boxwood (, T) of the flexible jacket (2). At this time, the base (8) and the lower surface of the inner drum (1
5 and the lower boxwood (J) of the jammit (2) are both sealed.

In addition, a flexible pipe (K,) connected to the backing (ψ) fixed to the upper lid (6) passes through the upper lid (6) and is connected to the switching valve (To), and the switching valve (V) is further connected to the backing (ψ). It is branched and one pipe (R3) is connected to a fluid feeder (such as high-pressure air or high-pressure steam), and the other pipe (K)
is connected to a vacuum pump (P).

The belt vulcanizer of the present invention has the above-mentioned configuration, and the manner in which a belt is vulcanized using this belt vulcanizer will now be described.

First, prior to vulcanization, an inner cylindrical drum (1) is formed in the molding process.
Wrapping a flat wide 1 unvulcanized belt sleeve (4) around the outer circumference of the cylindrical flexible jacket (2) attached to the
Next, with this sleeve (4) mounted on the drum (1), the base (3) is placed at a predetermined position inside the outer cylindrical mold (5) at a required distance (b) as shown in FIG. Place and fix on top. Then, in this state, the upper lid (6) is placed on the inner drum (1) and the outer mold (5),
Dovetail groove (()) as described above on the top surface of the outer mold (5)
It is fixed by means such as fitting or bolting.

Thus, by fixing to the top lid (6) in this way, the top lid (6), the top surface (1) of the inner drum, and the upper triangular boxwood (T) of the flexible jacket (2) are sealed. Backings (Q) and (c) fixed to the upper surface of the inner drum (1) and the lower surface of the upper lid (6)
Th is in close contact with the fluid supply and discharge pipe (Kl),
(Kz) is connected.

Thus, in this state, next, the fluid feeder is operated to supply high pressure air or high pressure steam to the pipe (Km) and the valve (
V), a flexible pipe (Kl), and the fluid is fed into the inner surface of the flexible jacket (2) via the fluid inlet and outlet pipes (Kl).

Here, the flexible jacket (2) has upper and lower triangular boxwoods (J), (J) are connected to the upper lid (6) and the base (3).
), the inner surface of the jacket (2) and the outer surface of the inner drum (1) are filled with the high-pressure fluid introduced above, and the flexible jacket (2) gradually expands, causing the outer surface of the inner drum (1) to expand. The unvulcanized belt sleeve (4) mounted on Contact and flexible jacket (2)
Due to the expansion and pushing force of
into the V-groove (G) of the sleeve (4) as shown in Figure 2.
) Vulcanized poly V having multiple V-shaped protrusions (ribs) on the surface
This results in the formation of a belt sleeve (4').

After the above-mentioned vulcanization, the valve (7) is operated by a vacuum pump.

(P), activate the vacuum pump (P) to exhaust the air, etc. filled in the flexible jacket (2), and then use suction to move the jacket (2) back to its original position as shown in Figure 1. Contract to return to position.

Next, the inner drum (1) and the vulcanized poly V-belt sleeve (4) are taken out.

Root sleeve (451d, later inserted into another drum,
By cutting the surface of the sleeve (A) to a predetermined width in the circumferential direction and inverting it from the drum, a plurality of poly V-shaped tubes with a constant length and an accurately molded V-shaped tube are formed as shown in Fig. 4. You will get a belt.

Note that the outer cylindrical mold (5) used here can also be a split type mold as shown in Fig. 3 as described above, and if such a split mold (5) is used, the unvulcanized sleeve (4 ) can be easily inserted and removed from the outer mold of the vulcanizing IJ-pu (4) and the 4-do (5), and this dividing surface (D) l (D5 has a kind of air bleed function. As a result, the V-shaped tube can be molded even more accurately.

Furthermore, although the method for vulcanizing poly V-belts has been mainly described here, the present invention is not limited to poly-V belts. For example, in the case of a multi-rip belt in which V-belts having a trapezoidal cross-section are connected, the vulcanization method can be applied as shown in FIG. By continuously providing trapezoidal grooves on the inner circumferential surface of the outer mold (5), a multi-rip belt as shown in FIG. A plurality of V-belts can be obtained.

As described above, the present invention provides a wide 7-rat unloader which is attached to the outer circumferential surface of a cylindrical drum whose upper and lower parts have a truncated cone shape through a flexible jacket in which flanges having a triangular cross section are formed on the upper and lower inner circumferential edges. The vulcanized belt sleeve is simultaneously expanded and expanded over the entire circumferential surface of the sleeve by fluid pressure, and multiple grooves are formed on the inner circumferential surface, and a lip is formed on the sleeve surface by pressing against a heated outer cylindrical mold. This is a power transmission belt vulcanizer, in which vulcanization is carried out in parallel with the stretching of the unvulcanized belt sleeve, which not only simplifies the work process and improves production efficiency, but also allows the resulting belt to be Since it is constant and does not stretch, and the lip surface is accurately molded, it increases the belt transmission efficiency.In addition, compared to the conventional method, the operation is extremely simple and there is no scrap, resulting in a significant reduction in belt transmission efficiency. It has many advantages such as significant cost reduction.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an example of the belt vulcanizer according to the present invention before vulcanization, Fig. 2 is a cross-sectional view of the same vulcanizer shown in Fig. 1 after vulcanization, and Fig. 3 is the main FIG. 4 is a plan view showing another embodiment of the outer mold used in the vulcanizer of the invention, FIG. A cross-sectional view showing another example of the outer mold used in the vulcanizer, FIG. 6 is a partial cross-sectional perspective view of a multi-rib belt obtained by the outer mold of FIG. 5, and FIG.
FIG. 2 is a partially cross-sectional perspective view of a V-belt obtained by cutting the multi-rib belt shown in the figure. (1)・・・・・・・・・Inner drum. (2)...Flexible Jahut. (5)・・・・・・・・・Outer cylindrical mold. (6)・・・・・・・・・Top lid. (K,)・・・・・・Fluid supply and discharge pipe. (J) (,T)・・・・・・Tsuba. (V-shaped groove. 1I11 No. 21

Claims (1)

[Claims] 1. An inner cylindrical drum with a truncated conical upper and lower part having a fluid supply/discharge mechanism inside, a plurality of grooves formed along the inner peripheral surface, and a heating mechanism inside. an outer cylindrical mold disposed on the outer periphery of the inner drum; and an upper lid that seals and fixes the upper surfaces of the inner drum and the outer mold; The power transmission is characterized in that an expandable and contractible cylindrical flexible jacket is attached to the upper and lower inner peripheral edges of the inner drum to form a collar with a triangular cross section that fits into the truncated conical edges of the upper and lower parts of the inner drum. Belt vulcanizer. The transmission belt vulcanizer according to claim 1, wherein the external cylindrical mold can be divided into a plurality of pieces in the axial direction.