WO2003016181A1

WO2003016181A1 - Cloth-reinforced conveyor belt

Info

Publication number: WO2003016181A1
Application number: PCT/JP2001/006862
Authority: WO
Inventors: Atsushi Imai
Original assignee: Bridgestone Corporation
Priority date: 2001-08-09
Filing date: 2001-08-09
Publication date: 2003-02-27
Also published as: JPWO2003016181A1

Abstract

A cloth-reinforced conveyor belt which is made to pass over a pair of pulleys and endlessly run to convey a load by turning either of the pulleys. This conveyor belt is provided with a plurality of, preferably four reinforcing cloths which are laminated in the thickness direction and of which the inner reinforcing cloths have a larger elastic modulus than that of the outer ones. It is preferrable that the inner reinforcing cloths are formed of canvas made of polyester whereas the outer reinforcing cloths are formed of canvas made of polyamide represented by nylon.

Description

Description Cloth reinforced conveyor belt Technical field

The present invention relates to a conveyor belt reinforced by cloth. Background art

Conventionally, in order to reinforce the conveyor belt, various core materials and reinforcing cloths are provided inside the conveyor belt.

So-called canvas made of synthetic fiber is widely used as a reinforcing cloth. The sleeve stiff cloth is disposed in the conveyor belt in a belt-like shape oriented in the longitudinal direction of the belt and a plurality of sheets are stacked in the thickness direction.

As shown in Fig. 4, this type of cloth reinforced conveyor belt (1) has its ends joined together to form an endless belt, which is wrapped between a pair of pulleys (2) and (3), and One of the pulleys (2) or (3) is rotated endlessly to make it run endlessly. The conveyed material is placed and transported on the upper traveling path. A tension pulley (6) is drawn downward in a U-shape from between a pair of guide pulleys (4) and (5) arranged along the track, and its lower end is spring-biased downward. ) Is often used.

In the use state shown in FIG. 4, when the conveyor belt (1) runs around each of the pulleys (J) to (6), for example, as shown in FIG. 5, the conveyor belt (1) is disposed in the conveyor belt (1). Of the plurality of reinforcing cloths (7), tensile stress is applied to the outer one and shrinkage stress is applied to the inner one.

Such a phenomenon becomes more conspicuous as the outer diameter of the pulley to be wound around is smaller, and as the thickness of the belt or the number of sleeves (7), that is, the number of plies, is larger.

In order to cope with such a phenomenon, in the past, for example, among a plurality of reinforcing cloths, the material of the reinforcing cloth in each layer is determined so that the outer one has a higher breaking strength than the inner one. (Refer to Japanese Patent Publication No. Hei 21-27991) Not enough. In particular, if the breaking strength of the outer reinforcing cloth is large, the zero running resistance becomes large when running around the pulley, and the driving motor and the like must be large and powerful.

Also, as shown in FIG. 4, the conveyor belt (J) bends in the opposite direction when turning around the guide pulleys (4) and (5) than when turning around the pulleys (2) and (3). Therefore, it is difficult to determine the material of each ply so as to be suitable for both. SUMMARY OF THE INVENTION In view of the above-mentioned problems of the conventional technology, the present invention provides a cloth sleeve which has excellent resistance to llil fatigue, has low running resistance during endless running, and can run smoothly. It aims to provide a conveyor belt. Disclosure of the invention

According to the present invention, the above section is solved as follows.

(1) In a cloth reinforced conveyor belt in which a plurality of reinforcement cloths facing in the hand direction are laminated in the thickness direction and arranged inside, the elastic coefficient of the inner reinforcement cloth in the thickness direction is determined by the outer sleeve It should be larger than the elastic modulus.

By doing so, when the belt runs around the pulley, the outermost reinforcing cloth farthest from the pulley is easy to compress, and the reinforcing cloth close to the pulley is easily compressed. As well as improving the flex fatigue, the belt's resistance to running around the pulley is reduced, and the belt can rotate smoothly.

(2) At about ¾1 (1), if the elastic coefficient of the inner reinforcing cloth is set to 5 to 4 times the elastic coefficient of the outer reinforcing cloth, the effect of the above (1) can be best achieved. it can. If it is less than 1.5, the effect of providing the difference cannot be sufficiently exerted, and if it is 4 or more, the difference becomes too large and the balance worsens.

(3) In the above (または) or (2), the number of plies, which is the number of reinforcing cloths in the thickness direction | i¾, is 4, and the elastic coefficient of the inner two reinforcing cloths is two. When the elasticity coefficient is larger than the elasticity of the reinforcing cloth, a sufficient effect can be exerted with a minimum number of plies, and the refreshability can be improved. The number of plies can be 4 or more. In this case, if the elastic coefficient of the inner two reinforcing cloths is larger than the elastic coefficient of the outer two reinforcing cloths, almost the same It can be effective.

1- (4) In any of the above (I) to (3), if the inner reinforcing cloth is made of polyester and the outer reinforcing cloth is made of polyamide, a high-performance conveyor belt can be manufactured safely. Can be.

Polyester cloth is difficult to get along with when pulled, but is weak against llfl.Polyamide cloth such as nylon is easy to get along when pulled and is strong against bending. There is nature. The above arrangement is designed to make the best use of the characteristics of both of them. This arrangement provides the ability to follow a small pulley diameter comparable to nylon, and minimizes intermediary. In this way, it is possible to take up the same short shot as polyester.

In addition, the fatigue properties of the belt joint can be improved.

(5) In any one of the above items (1) to (4), the ends of the reinforcing cloth of each ply are butted against each other, and the butted portions of each ply are displaced from each other in the belt longitudinal direction. When the end portions are joined to form an endless belt, stress can be prevented from being concentrated at one place when the belt runs around the pulley. Brief description of the figure

FIG. 1 is a longitudinal sectional side view schematically showing a joint portion of a cloth reinforced conveyor belt of the present invention, and FIG. 2 is a view showing the same portion when the embodiment of the present invention and a comparative example are pulled by being replaced with a test apparatus. Figure 3 shows the relationship between distance and bending stress, Figure 3 also shows the relationship between distance and bending stress, Figure 4 is a schematic diagram showing the jfl state of use of a conventional cloth-reinforced conveyor belt, FIG. 5 is a diagram schematically showing a belt similarly wound around プーリ pulleys. BEST MODE FOR CARRYING OUT THE INVENTION

An embodiment of a cloth reinforced conveyor belt of the present invention will be described with reference to the drawings.

As shown in Fig. I, this cloth-reinforced conveyor belt (hereinafter simply referred to as a belt) (10) is a four-ply reinforcing cloth (11) (1) (13) (14) facing the good hand direction. With the rubber layers (1 5), (1 6) and (17) in between, and with the outermost cover rubbers (18) and (19) attached, wear them slightly in the belt thickness direction (vertical direction in Figure I). Vulcanize the rubber layer (15) (16) (17) and the cover rubber (18) (19), It is formed in a belt shape.

As shown in the figure, the ends of the belt (10) in the shape of a circle are connected to the ends of the reinforcing cloth (1 1) (12) (13) () of each ply by a slight gap of, for example, about 1 Omm. The butted portions (11a), (12a), (13a), and (14a) are shifted from each other in the longitudinal direction of the belt, for example, by 25 Omm, and the butted portions are shifted. (A) The rubber layer (15) (16) (17) and the cover rubber (18) (19) in the range including (12a) (13a) (14a) are joined to each other by re-vulcanizing, and the belt ( 10) is endless.

Out of the four-ply reinforcing cloths (11) to () 4), the inner two-ply reinforcing cloths (12) and (13) are made of polyester cloth, preferably polyester canvas, and the outer two-ply reinforcing cloths are used. (11) It is formed so that the elastic modulus in the longitudinal direction is larger than that of (14). The outer reinforcing cloth (11) (14) is made of a polyamide cloth, preferably a polyamide cloth.

The ratio 弾性 1 / Ε 2 of the elastic coefficient (Ε 1) of the inner sleeve strong cloth (12) (13) to the elastic coefficient (Ε 2) of the outer reinforcing cloth (11) (1 is 1.5 to 1.5 It is preferable to define the range of Iffl.

As a specific example of the polyester cloth, a woven cloth in which at least the warp yarn is made of polyester such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) can be used.

The polyester fabric may be such that only the warp yarns are made of PE, PEN or the like, and the warp yarns and weft yarns are both made of P12T, PEN or the like. If the warp is a polyester cloth made of PET, PEN, etc., the weft should be polyamide such as 6-nylon, 6.6-nylon, 4.6-nylon, MXD6 nylon, polyvinyl alcohol such as vinylon, etc. Rayon, cotton, EZC blend, etc. can be used.

As an example of the variant of the polyamide cloth, a woven cloth in which at least the warp yarn is made of polyamide such as 6-nylon, 6.6-nylon, 4.6-nylon can be used. Also in this polyamide cloth, only the warp may be made of 6-nylon or the like, and both the warp and the weft may be made of 6-nylon or the like.

If the warp is a polyamide cloth consisting of 6-nylon or the like, use a polyester such as PET or Ρ Ε, PVA such as vinylon, rayon, or cotton as the weft. Can be

The weft of each of the reinforcing cloths (U) to (1) is not limited to ordinary yarn (filament yarn, spun yarn), and monofilament yarn such as nylon, vinylon, and PET can also be used. The weaving method of these reinforcing cloths (11) to (14) is not particularly limited, and may be any of plain weave, straight warp weave, twill weave, and blind weave.

The number of twists and the basis weight of the fibers constituting the reinforcing cloth are not particularly limited as long as the design satisfies the above elastic modulus ratio.

The material of the rubber layer (15) (16) (Π) and the cover rubber (18) (1.9) are not particularly limited. Natural rubber, butyl rubber, styrene-butadiene rubber (SBR), nitrile 'butadiene rubber (NBR) A synthetic rubber such as ethylene-propylene rubber (EPR) or a blend rubber thereof can be used.

The ratio of the thickness of the cover rubber (18) (19) to the thickness of the reinforcing material is different depending on the intended use of the cloth reinforced conveyor belt (1). The thickness of the cover rubber (18) on the upper side (table) should be 0.3 to 1.0 cm, and the thickness of the cover rubber (19) on the lower side should be 0.2 to 0 cm. It is preferable to use a cloth-reinforced conveyor belt (1) having a thickness of 2 to 0.4 cm and a total thickness of 0.7 to 2.4 cm.

Example

Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples.

The cloth reinforced conveyor belts of JI3 in Examples and Comparative Examples are as follows.

Common conditions

Long (endless) 1 75 0 mm Upper cover rubber (18) thickness 6 mm

Lower cover rubber (19) thickness 3 mm

Rubber shear modulus 0.5 M Pa

Structure As shown in Fig. 1

Test method

Using a device conforming to the German Industrial Standard 13 ί N2 2 110, each of the above belts is wrapped around a pair of pulleys with an I diameter of 50 Omm, and the joint of the belts is a straight circuit. When one pulley was pulled in the direction away from the other pulley, the relationship between the distance and the tension at the portion indicated by the dashed line in FIG. The result is shown in figure 2.

Similarly, FIG. 3 shows the relationship between the distance of the same portion as described above and the llll stress in the belt when the joint portion of the belt is located at the top of one pulley.

A to D in FIGS. 2 and 3 indicate peak values corresponding to the points A to D shown in FIG.

In Comparative Examples 1 and 2, as shown in (ΙΠ) and (IV) in FIG. 2, there was a large difference between the peak values of A to D, and the tension was concentrated on a part. ^ In (2) and (3) above, the difference between the peak values of A to D is small, and the tension is almost uniformly dispersed.

In FIG. 3, the peak value variation in the comparative example 1 of (ΙΠ) is largest, and the peak value variation in the example 1 of (I) is also small and almost uniform. Although the peak values of Example 2 of (ii) and Comparative Example 2 of (IV) show a small variation, the results of both Figure 2 and Figure 3 are comprehensively judged. It can be seen that Examples 1 and 2 are superior to Comparative Examples 1 and 2.

上の Business availability

As described above, the cloth-sleeve strong conveyor belt of the present invention can be used for all kinds of belt conveyors that may be wrapped around pulleys.

Claims

Claims Iffl

: 1. In a cloth reinforced conveyor belt in which a plurality of reinforcing cloths oriented in the longitudinal direction are arranged in the thickness direction so as to be laminated,

A cloth reinforced conveyor belt, wherein the elastic coefficient of the inner reinforcing cloth in the thickness direction is larger than the elastic coefficient of the outer reinforcing cloth.

2. The cloth reinforced conveyor belt according to claim I, wherein the elastic coefficient of the inner reinforcing cloth is J.5 to 4 times the elastic coefficient of the outer reinforcing cloth.

3. The number of plies, which is the number of reinforcing cloths in the thickness direction, is 4 or more, and the elastic coefficient of the two inner reinforcing cloths is larger than the elastic coefficient of the two outer reinforcing cloths. Or the cloth reinforced conveyor belt according to 2.

4. The cloth reinforced conveyor belt according to any one of claims 1 to 3, wherein the inner sleeve strong cloth is made of polyester and the outer reinforcing cloth is made of polyamide.

5. The endless belt is formed by abutting the ends of the reinforcing cloth of each ply with each other, shifting the butted portions of each ply in the belt longitudinal direction with each other, and joining the ends together. A cloth-reinforced conveyor according to any one of 1 to 4.