JPH11320701A - Manufacture of open end v-ribbed belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the drive capability and prevent a pitch noise from being generated by winding a rib rubber layer, a core and a spine rubber layer around a mold with spiral grooves cut in parallel side by side and spirally cutting a batch of a few spiral grooves set in parallel, in a belt sleeve obtained through vulcanizing following the winding process. SOLUTION: An unvulcanized rib rubber layer 4 and an adhesive rubber layer 5 are wound around a mold 2 with a desired number of spiral grooves cut in parallel for example, three pieces of the spiral groove, and further a batch of two core wires 6 are wound around the spiral. After that, the adhesive rubber layer 5 is once again wound around the core wires 6 are a rubber-coated fabric 7 is wound to vulcanize the rubber material to obtain an integrated belt sleeve which is in turn, released from the mold 2. In addition, a cutter is moved at a specified velocity in the width direction of the belt sleeve to cut the sleeve spirally and thereby an open-end belt is obtained. Thus it is possible to easily manufacture the open end V-ribbed bent having a desired number of ribs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an open-ended V
The present invention relates to a ribbed belt, and to a belt used for an elevator or an automatic door.

[0002]

2. Description of the Related Art At present, elevators and automatic doors are required to reciprocate in order to move up and down and open and close. In addition, the reciprocating motion is often a motion having a long span. For this reason, if the belt used for such applications is an open-ended flat belt or open-ended toothed belt, which is suitable for reciprocating motion with a longer span than a normal endless belt, There are many.

[0003] However, a flat belt used in an elevator requires a larger transmission capacity as the load on the elevator increases. Normally, a flat belt has a small transmission capacity among belts, and in order to obtain a flat belt having a transmission capacity that can be demanded, the belt must have a large width and strength.

A toothed belt is superior to a flat belt in terms of transmission capacity. Therefore, it is sometimes advantageous to use a toothed belt for an application in which the transmission capacity is insufficient with a flat belt. In addition, toothed belts have excellent positioning accuracy because they do not slip during power transmission.
It is widely used for applications such as automatic doors.

[0005]

However, the use of a toothed belt is disadvantageous in terms of noise as compared with a flat belt because pitch noise is generated when a tooth portion passes through a pulley. Therefore, in a place where noise is disliked, a flat belt must be used even though there is a problem of the transmission capacity.

Accordingly, the present invention provides a method for manufacturing an open-ended V-ribbed belt so that a V-ribbed belt having a larger transmission capacity than a flat belt and generating no pitch noise unlike a toothed belt can be used. The purpose is to provide.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, an open end V
In the method of manufacturing a ribbed belt, the number of spiral grooves in which at least two spiral grooves are arranged in parallel and the rib rubber layer, the core body, and the back rubber layer are wound around a mold and vulcanized belt sleeves are arranged in parallel. It is characterized in that a minute is spirally cut.

According to the second aspect of the present invention, the step of spiral cutting includes a step of attaching a belt sleeve to a hook and a machine, and cutting while feeding a cutter by a rib pitch.

By employing such a method, an open-ended V-ribbed belt having a desired number of ribs can be easily manufactured.

Next, in a third aspect, a core wire made of a rope is used as the core body and is wound around a spiral in the same direction as the spiral groove of the mold. In a fourth aspect, the angle and the core wire of the spiral groove of the mold are wound. The difference between the angles is 0.6 ° at the maximum.

In this way, it is preferable to make the direction of the ribs and the direction of the core wire of the belt as close as possible, because the number of effective core wires reaching the tension in the belt increases and the transmission capacity becomes larger.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective sectional view of a main part of a V-ribbed belt 1 obtained by a method according to the present invention.
FIG. 2 is used in the method for manufacturing an open-ended V-ribbed belt of the present invention. FIG. 3 is a perspective view of the mold 2, and FIG. 3 is an enlarged view of a portion A in FIG.

In the method of manufacturing an open-ended V-ribbed belt according to the present invention, first, a desired number of three spiral grooves (here, a case of manufacturing a three-rib belt) as shown in FIG. 2 will be described. 2 (2a, 2b, 2c)
Is wound around the mold 3 cut in parallel, and then the adhesive rubber layer 5 is wound, and two core wires 6 are wound together on the spiral.
After the core wire 6 is wound, the adhesive rubber layer 5 is wound again, and then a rubberized canvas 7 is wound, and the vulcanized vulcanized cloth is used for vulcanization.

After the vulcanization is completed, the integrated belt sleeve 8 is released from the mold 3 and then mounted on the drum 9 of the cutting machine. As shown in FIG. 4, the cutter 1 is rotated while the belt sleeve 8 attached to the drum 9 is rotated.
Although it is cut to a predetermined width by 0, since an open-end belt is made here, the cutter 10 is cut in a spiral shape while moving the cutter 10 at a predetermined speed in the belt sleeve width direction (the arrow direction in the drawing). With this, an open-ended belt can be obtained.

The speed at which the cutter 10 is moved is
As shown in FIG. 3, the speed is adjusted so as to spirally cut along the top of the mountain portion 12 between the spiral grooves 2a, 2b, and 2c of the three spiral grooves 2a, 2b, and 2c arranged in parallel on the mold 3. By cutting to the end of the belt sleeve, a V-ribbed belt having three ribs can be obtained in an open end state.

In the method described above, the core wire 6 is
This is a method adopted in order to reduce the angle between the core wire 6 and the spiral groove 2 on the mold so as to reduce the angle θ between the longitudinal direction of the belt and the core wire. is there.

In FIG. 5, if the angle .theta. Between the longitudinal direction of the V-ribbed belt 1 and the core embedded in the belt becomes too large, the V-ribbed belt 1 is embedded in the belt in a state where the core is broken. However, it cannot fulfill its role as a tensile body. The smaller the angle, the longer the continuous core from the shredded state is buried in the belt,
It can be said that the effective number of core wires that are sensitive to the tension in the belt increases.

Therefore, in order to make the spiral angle when the core wire 6 is wound around the mold 3 and the angle of the spiral groove 2 on the mold 3 as close as possible, two core wires 6 having a small spiral angle are wound. The angle is increased so as to approach the angle of the spiral groove 2 of the mold 3.

As described above, the angle θ between the core wire 6 and the longitudinal direction of the belt is preferably small, and is preferably within 0.6 °. If it exceeds 0.6 °, the effect of the core wire 6 as a tensile member decreases, and the tensile strength of the belt decreases and the transmission capacity decreases, which is not preferable.

The heating / pressurizing means in the vulcanizing step is not limited to the method using steam in the vulcanizing can, and other means such as a method of vulcanizing by rotating the heating drum in a pressed state. But it doesn't matter.

Although the description has been made by taking a three-rib V-ribbed belt as an example, the required number of ribs can be manufactured as required with respect to the number of ribs, and the same number of parallel ribs as the number of ribs can be manufactured. What is necessary is just to use the mold which has a spiral groove.

In addition to using a mold having the same number of spiral grooves as the required number of ribs, by using a mold having more spiral grooves than the required number of ribs, it is possible to reduce the number of ribs smaller than that number. Can be manufactured. For example, by using a mold having six parallel spiral grooves,
Three rib V-ribbed belts and two 3-rib V-ribbed belts can be manufactured. However, if the size of the belt sleeve is the same, the obtained belt length is 1/2.
Or 1/3.

The open-ended V-ribbed belt 1 manufactured by the method of the present invention is the same as a normal V-ribbed belt except that it is open-ended.

The rubber used as the rib rubber layer 4 includes hydrogenated nitrile rubber (HNBR) and chloroprene rubber (C
R), natural rubber (NR), chlorosulfonated polyethylene (CSM), alkylated chlorosulfonated polyethylene (ACSM), styrene butadiene rubber (SB
R). Hydrogenated nitrile rubber has a hydrogenation rate of 80
% Or more, and preferably 90% or more in order to exhibit heat resistance and ozone resistance characteristics. Hydrogenation rate 8
When the hydrogenated nitrile rubber is less than 0%, the heat resistance and the ozone resistance are extremely reduced. Considering oil resistance and cold resistance,
The amount of bound acrylonitrile is preferably in the range of 20-45%.

The rib rubber layer 4 is mixed with short fibers made of nylon 6, nylon 66, polyester, cotton, aramid or the like as needed to improve the lateral pressure resistance of the ribs and to improve the side contact with the pulley. By projecting short fibers on the surface of the rib to reduce the friction coefficient of the rib, noise during belt running can be reduced. Of these short fibers, it is desirable to use aramid fibers having strength and abrasion resistance in combination with other fibers.

Further, in order to improve the adhesion of the short fibers to the rib rubber layer 4, the short fibers are subjected to an adhesive treatment with a treatment liquid selected from an epoxy compound and an isocyanate compound.

The same rubber as the rib rubber layer 4 is used for the adhesive rubber layer 5 except that short fibers are not mixed.

As the cord 6 to be used, ropes made of fibers such as polyesters such as polyethylene-2,6-naphthalate and polyethylene terephthalate, polyamides such as nylon 6 and nylon 66, aramid and glass, and in some cases woven fabrics Cloth can also be used.

The core wire 6 is also subjected to an adhesive treatment similarly to the short fiber.
The adhesion treatment is performed by first impregnating the untreated cord into a tank containing a treatment liquid selected from an epoxy compound and an isocyanate compound, pre-dipping, and then passing the untreated cord through a drying furnace set at 160 to 200 ° C. for 30 to 600 seconds. After drying, immersed in a tank containing an adhesive solution consisting of an RFL solution,
30 to a stretching heat setting processor set at a temperature of 10 to 260 ° C.
It is stretched by 1 to 3% for about 600 seconds to obtain a stretched cord.

Examples of the epoxy compound include polyhydric alcohols such as ethylene glycol, glycerin, and pentaerythritol; reaction products of polyalkylene glycols such as polyethylene glycol with halogen-containing epoxy compounds such as epichlorohydrin; (4-hydroxyphenyl) dimethylmethane,
It is a reaction product with polyhydric phenols such as phenol-formaldehyde resin and resorcin-formaldehyde resin and halogen-containing epoxy compounds. This epoxy compound is used by being mixed with an organic solvent such as toluene and methyl ethyl ketone.

Examples of the isocyanate compound include 4,4'-diphenylmethane diisocyanate, toluene-2,4-diisocyanate, P-phenyl diisocyanate, and polyaryl polyisocyanate. This isocyanate compound is also used by being mixed with an organic solvent such as toluene and methyl ethyl ketone.

The RFL solution is obtained by mixing a latex with an initial condensate of resorcinol and formalin, and the latex used here is chloroprene, styrene / butadiene / vinylpyridine terpolymer, hydrogenated nitrile rubber (HNBR). ), Nitrile rubber (NBR) and the like.

As the canvas used for the rubberized canvas 7, a canvas woven in a plain weave, a twill weave, a satin weave, or the like using a yarn made of cotton, polyamide, polyethylene terephthalate, or aramid fiber is used.

As the rubber used for the rubberized canvas 7, a rubber obtained by attaching a rubber composition similar to that of the rib rubber layer 4 to the canvas by a method such as coating, friction, or gluing is used.

[0035]

As described above, according to claim 1 of the present invention,
In a method for manufacturing an open-ended V-ribbed belt, a spiral in which at least two spiral grooves are cut in parallel and a rib sleeve is wound around a rib rubber layer, a core body, and a back rubber layer to form a vulcanized belt sleeve. It is characterized in that the number of grooves is spiral-cut together.

According to the second aspect of the present invention, the step of spiral cutting includes a step of attaching the belt sleeve to a hook and a machine, and cutting while feeding the cutter by the rib pitch.

By employing such a method, an open-ended V-ribbed belt having a desired number of ribs can be easily manufactured.

Next, in a third aspect, a core wire made of a rope is used as the core body and is wound around a spiral in the same direction as the spiral groove of the mold. In a fourth aspect, the angle and the core wire of the spiral groove of the mold are wound. The difference between the angles is 0.6 ° at the maximum.

As described above, it is preferable that the direction of the ribs and the direction of the cords of the belt are made to coincide as much as possible, since the number of effective cords reaching the tension in the belt increases, so that the transmission capacity becomes larger.

[Brief description of the drawings]

FIG. 1 is a sectional perspective view of a main part of an open-ended V-ribbed belt of the present invention.

FIG. 2 is a perspective view of a mold.

FIG. 3 is an enlarged view of a portion A in FIG. 2;

FIG. 4 is a schematic diagram of a belt being cut by a cutting machine.

FIG. 5 is a schematic diagram showing a relationship between an angle between a belt and a core wire.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Open-end V-ribbed belt 2 Mold 3 Spiral groove 4 Rib rubber layer 5 Adhesive rubber layer 6 Core wire 7 Rubberized canvas 8 Belt sleeve 9 Drum 10 Cutter

Claims (4)

[Claims] 1. A method of manufacturing an open-ended V-ribbed belt, comprising: forming a vulcanized belt sleeve by winding a rib rubber layer, a core body, and a back rubber layer around a mold having at least two spiral grooves cut in parallel. A method for manufacturing an open-ended V-ribbed belt, wherein a plurality of spiral grooves arranged in parallel are collectively spiral-cut. 2. The method for producing an open-ended V-ribbed belt according to claim 1, wherein the step of spiral cutting includes a step of attaching a belt sleeve to a hook and a machine, and cutting while feeding a cutter by a rib pitch. 3. A core wire made of a rope is used as a core body,
The method for producing a V-ribbed belt according to claim 1 or 2, wherein the V-ribbed belt is wound around a spiral in the same direction as the spiral groove of the mold. 4. The difference between the angle of the spiral groove of the mold and the angle of winding the core wire is at most 0.6 °.
A method for producing the open-ended V-ribbed belt described in the above.