JP6697297B2 - Industrial belt - Google Patents

Description

  The present invention relates to an industrial belt, and more particularly to an industrial belt that can be manufactured without increasing the number of steps in manufacturing the belt, and that can suppress initial elongation of a core wire and improve flex resistance at the same time.

  Industrial belts, such as power transmission belts and conveyor belts, have a plurality of core wires extending in the longitudinal direction of the belt body embedded therein in order to impart belt strength and tensile strength.

  For example, an industrial belt configured by using a core cord made of a steel cord has been proposed (Patent Document 1).

  In such an industrial belt, tension is first applied to prevent the belt from slacking during use, but this tension application causes an initial elongation of the core wire within a few days after the start of use. The initial elongation is a permanent elongation that occurs in the core wire at an initial stage. Since the core wire is composed of multiple strands twisted together, the tension applied to the belt closes the gap between the core wires, and the core wire is stretched in the process of reaching a close contact state, resulting in initial elongation. ..

  Since the belt tension decreases when the initial elongation occurs, in applications where the initial elongation becomes a problem, it is necessary for the user to re-tension the belt tension after the initial elongation converges.

  Generally, in order to suppress the initial elongation, the spacing between the strands is reduced by reducing the diameter of the strands that make up the strands, or the number of twists of the strands is reduced to reduce the number of strands after tension is applied. The influence of wire tightening is reduced. In order to reduce the influence of such core wire tightening, the fiber core wire can reduce the core wire diameter and make the wires denser than the metal core wire such as steel cord. Suitable because it can.

  For example, an industrial belt configured by using a core made of chemical fiber or inorganic fiber has been proposed (Patent Document 2).

Japanese Patent No. 5381141 JP 2012-197857 A

  By the way, an industrial belt using a fiber-type core wire as a core wire may cause bending fatigue when locally bent. It is considered that this is because the fiber-based core wire has a lower bending strength than the metal-based core wire.

  Therefore, it is an object of the present invention to provide an industrial belt that can both suppress the initial elongation of the core wire and improve flex resistance.

  Other problems of the present invention will be clarified by the following description.

  The above problems can be solved by the following inventions.

1. An industrial belt, wherein a plurality of fiber-based core wires and a plurality of metal-based core wires are arranged inside the belt body so as to be mixed in the width direction of the belt body.
2. The distance between the barycentric position of the entire plurality of fiber-based cords and the barycentric position of the entire plurality of metal-based cords is 40% or less of the total width of the belt main body. Industrial belt.
3. The ratio of the number of the fiber-based core wires to the number of the metal-based core wires is as follows: fiber-based core wire: metal-based core wire = 0.75: 1 to 1: 0.75. Industrial belt as described.
4. The industrial belt according to any one of 1 to 3, wherein the fiber-based core wire and the metal-based core wire are arranged symmetrically with respect to a center of the belt body in the width direction. ..
5. Of the plurality of fiber-based cores and the plurality of metal-based cores, the cores arranged at the outermost edges on both sides of the belt body are the metal-based cores. The industrial belt according to any one of 4 above.
6. 6. The industrial belt according to any one of 1 to 5 above, which is a toothed belt in which a plurality of tooth portions are provided on the belt body.

  According to the present invention, it is possible to provide an industrial belt that can achieve both suppression of initial elongation of a core wire and improvement of bending resistance.

Partial sectional view showing an embodiment of an industrial belt according to the present invention Sectional drawing which follows the (ii)-(ii) line in FIG. Sectional drawing which follows the (ii)-(ii) line in FIG. 1 explaining a gravity center position by the other aspect of arrangement | positioning of the core wire in the industrial belt which concerns on this invention. Enlarged sectional view showing the schematic configuration of the core wire (A) (b) is sectional drawing which follows the (ii)-(ii) line in FIG. 1 which shows the other aspect of arrangement | positioning of the core wire in the industrial belt which concerns on this invention. The figure explaining the test method of the tension drop confirmation test by initial elongation. Graph showing the relationship between test time and tension in the tension drop confirmation test due to initial elongation Diagram explaining the test method of the bending test Graph showing the relationship between the bending diameter and the breaking strength in the breaking test

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 is a partial sectional view of an industrial belt according to the present invention, and FIG. 2 is a sectional view taken along line (ii)-(ii) in FIG. FIG. 3 is a sectional view taken along the line (ii)-(ii) in FIG. 1 for explaining the position of the center of gravity according to another arrangement mode of the core wires in the industrial belt according to the present invention.

  The industrial belt 1 shown in the present embodiment is a toothed belt in which a plurality of tooth portions 3 are provided on the lower surface of the belt body 2, and is entirely formed of a rubber-like elastic material such as polyurethane.

  Inside the belt body 2, a plurality of core wires 4 extending along the length direction of the belt body 2 (left-right direction in FIG. 1) are arranged in the width direction of the belt body 2 (left-right direction in FIG. 2). It is provided at intervals. Reference numeral 5 in FIG. 1 is a core wire holding groove. The core wire holding groove 5 is formed by transferring a protrusion of a molding die for supporting the core wire 4 at a predetermined position in the belt body 2 when the industrial belt 1 is manufactured. The core wire 4 is exposed at the portion of the core wire holding groove 5.

  The core wire 4 is composed of a plurality of fiber core wires 41 and a plurality of metal core wires 42, and these are arranged so as to be mixed in the width direction of the belt body 2. Here, “mixed in the width direction” means that the fiber-based core wire 41 and the metal-based core wire 42 are arranged without any deviation in the width direction of the belt body 2. For example, when the total number of the fiber-based core wires 41 and the metal-based core wires 42 is equal to each other, and the fiber-based core wires 41 and the metal-based core wires 42 are alternately arranged in the same number, they are arranged without deviation. It can be said that it has been done.

  Further, the total number of the fiber-based core wires 41 and the metal-based core wires 42 may be different, and for example, two fiber-based core wires 41 and three metal-based core wires 42 are alternately arranged. It can be said that they are arranged evenly even when they are present. Further, a state in which one fiber-type core wire 41 and four metal-type core wires 42 are alternately arranged can be said to be arranged evenly, and a state in which the object of the present invention can be achieved. Is. As described above, when the one or more fiber-based core wires 41 and the one or more metal-based core wires 42 are alternately arranged, the number of adjacent fiber-based core wires 41 and the metal-based core wires 42 is The difference is preferably 3 or less, and more preferably 2 or less.

  Furthermore, as shown in FIG. 3, it is preferable that the distance L between the center of gravity Ga of the entire plurality of fiber-based core wires 41 and the center of gravity Gb of the entire plurality of metal-based core wires 42 be closer to zero. The distance L is preferably 40% or less of the total width W of the belt body 2. Such a state does not depend on the number and thickness of the fiber-based core wires 41 and the metal-based core wires 42, and the deviation of the fiber-based core wires 41 and the metal-based core wires 42 is small, and the object of the present invention is achieved. It is in a ready state.

  As shown in FIG. 2, the fiber-based core wire 41 and the metal-based core wire 42 arranged inside the belt body 2 are not limited to being arranged side by side in the width direction without any step, but although not shown, the width direction It may be arranged in a staggered pattern.

  As the elemental wire constituting the fiber-type core wire 41, a non-metal wire made of chemical fiber such as glass fiber (glass fiber), aramid fiber, carbon fiber and polyester fiber is used.

  As an element wire forming the metal-based core wire 42, a wire such as steel or stainless steel is used.

FIG. 4 is an enlarged cross-sectional view showing the schematic configuration of the core wire.
Each of the fiber-based core wire 41 and the metal-based core wire 42 is configured by twisting a plurality of strands 40 as shown in the schematic configuration in FIG. The strand 40 is formed by bundling a plurality of the strands 40a made of the above-mentioned chemical fiber or metal.

  In general, in order to suppress the initial elongation of the core wire 4, it is effective to reduce the diameter of the wires 40 to reduce the gap X between the adjacent wires 40. From this viewpoint, the fiber-based core wire 41 is more suitable than the metal-based core wire 42 because the diameter of the wire 40 can be made smaller and the space between the wire 40, 40 can be made closer. However, since the fiber-based core wire 41 has a lower bending strength than the metal-based core wire 42, the bending resistance of the belt may be reduced only by the fiber-based core wire 41. Particularly, when the cord holding groove 5 is provided like the industrial belt 1 according to the present embodiment, the portion of the cord pressing groove 5 is thin and has low belt rigidity, and the cord is exposed. Is likely to be locally bent at the portion of the core wire holding groove 5, and the core wire may cause bending fatigue.

  However, according to the present invention, since both the fiber-based core wire 41 and the metal-based core wire 42 are arranged inside the belt main body 2, it is possible to exhibit both initial elongation suppression and bending resistance. Therefore, it is possible to suppress the decrease in bending resistance of the industrial belt 1 using the fiber-type core wire 41.

  That is, with respect to the initial elongation, the fiber-type core wire 41, which is unlikely to cause the initial elongation, works predominantly to suppress the occurrence of the initial elongation of the entire industrial belt 1. On the other hand, regarding the bending resistance, the metal-based core wire 42 having high bending rigidity and bending resistance functions predominantly, and even when the belt is locally bent, the metal-based core wire 42 is It supports so as to suppress excessive bending of 41, and suppresses the deterioration of the bending resistance of the industrial belt 1. Since the fiber-type core wire 41 and the metal-type core wire 42 are arranged so as to coexist in the width direction of the belt body 2, both the initial elongation suppression and the flex resistance are made compatible in the entire industrial belt 1. be able to.

  Moreover, since the industrial belt 1 only needs to use the fiber-based core wire 41 and the metal-based core wire 42 as the core wire 4 in a mixed manner, there is no need to change the conventional belt manufacturing process, and the manufacturing process is not required. The number of steps does not increase.

  In the present invention, the ratio of the number of the fiber-based core wires 41 and the metal-based core wires 42 arranged side by side inside the belt body 2 is as follows: It is preferable to satisfy the condition of 0.75. In this case, when viewed as a whole of the belt main body 2, since the number of any one of the core wires is not extremely biased, it is possible to analogize the same effect as that of the embodiment described later, and to suppress the initial elongation and improve the bending resistance. It is possible to exert the above-described effect of making the industrial belt 1 compatible with the above. In addition, even if the condition of fiber-type core wire: metal-type core wire = 0.5: 1 to 2: 1 is satisfied, it is inferior to the examples described later, but the initial elongation is suppressed and the bending resistance is improved for industrial use. It is possible to exert the above-mentioned effects that are compatible with the entire belt 1.

  In the example shown in FIG. 2, fifteen core wires 4 (fiber core wires: metal core wires = 0, which are composed of seven fiber core wires 41 and eight metal core wires 42, are provided inside the belt body 2. .875: 1) are mixed and installed side by side. Three fiber cores 41 are arranged in the center, and two fiber cores 41 and two metal cores 42 are arranged alternately on both sides of the fiber cores 41. The fiber-based core wire 41 and the metal-based core wire 42 are arranged without any bias. However, the arrangement mode of the fiber-type core wire 41 and the metal-type core wire 42 is not limited to this.

  For example, as shown in FIG. 5A, the fiber type core wire 41 and the metal type core wire 42 in the arrangement mode of FIG. 2 may be replaced.

  Further, as shown in FIG. 5B, the number of the fiber-based core wires 41 and the number of the metal-based core wires 42 may be equal to eight (fiber-based core wires: metal-based core wires = 1: 1). it can. In FIG. 5B, one metal-based core wire 42 is arranged at each end of the belt main body 2 in the width direction, and two fiber-based core wires 41 and two metal-based core wires 42 are alternately arranged therebetween. It is arranged.

  In the embodiment shown in FIGS. 5A and 5B as well, the fiber-based core wire 41 and the metal-based core wire 42 are arranged side by side so as to coexist in the width direction of the belt main body 2, and thus are similar to the embodiment of FIG. The effect of can be obtained.

  In any of the above arrangement modes, the fiber-type core wire 41 and the metal-type core wire 42 are arranged so as to be bilaterally symmetrical with respect to the center of the belt main body 2 in the width direction, which is a preferred embodiment of the present invention. Since the fiber-based core wire 41 and the metal-based core wire 42 have different characteristics such as offset and rotation when the belt is running, they are symmetrically arranged to effectively prevent the belt from being biased when running. it can.

  By the way, when the belt runs, both ends in the width direction interfere with the flange part of the pulley, the guide rails, and the like, so that a rising occurs, and a force for locally bending the both ends acts. When there is a concern about interference with the flange portion of the pulley, the guide rail, or the like when the belt is running, as shown in FIGS. 2 and 5B, the belt main body among the plurality of core wires 4 is used. It is preferable that the core wires 4 arranged at the outermost edges on both sides of 2 are the metal core wires 42. The metal-based core wire 42 has higher bending rigidity than the fiber-based core wire 41 and is resistant to local bending, and therefore, it is possible to improve the durability against the bending force applied when rising.

  In the above embodiment, a total of 15 or 16 cores 4 are arranged inside the belt body 2, but the total number of the cores 4 is not limited at all, and the respective cores 41, 42 are not limited. Can be increased or decreased depending on the diameter, the width of the belt body 2, and the like.

  In the case of a wider industrial belt, for example, a plurality of industrial belts 1 having the configurations shown in FIGS. 2 and 5A and 5B may be joined in the width direction.

  Although the above embodiment has been described by taking the toothed belt having the toothed portion 3 as an example, the present invention is an industrial application for power transmission or transportation having a core wire inside the belt body regardless of the presence or absence of the toothed portion. Widely applicable to belts for use.

  Hereinafter, the effects of the present invention will be illustrated by examples.

(Example 1)
In the belt main body of the endless belt made of polyurethane (width: 25 mm), 7 glass fiber cores as fiber cores and 8 steel cores as metal cores are illustrated. It was arranged in the same manner as in 2.

  The glass fiber core wire was formed by bundling 200 glass fibers having a diameter of 7 μm as a base, bundling them into 3 pieces, and further twisting them 11 sets.

  The steel core wire was formed by bundling seven steel cords each having a diameter of 0.1 mm into an element wire and twisting the seven element wires together.

  In this embodiment, the distance L between the center of gravity Ga of the seven fiber-based cores and the center of gravity Gb of the eight metal-based cores is 40% or less of the total width W of the belt body. ..

(Example 2)
Example 1 was the same as Example 1 except that 8 glass fiber core wires and 7 steel fiber core wires were arranged in the same arrangement as in FIG. 5 (a).

In this embodiment, the distance L between the center of gravity Ga of the entire eight fiber-based cores and the center of gravity Gb of the seven metal-based cores is 40% or less of the total width W of the belt body. ..

(Comparative Example 1)
Example 1 was the same as Example 1 except that all 15 core wires were made of glass fiber.

(Comparative example 2)
Same as Example 1 except that all 15 core wires were steel core wires.

<Tension drop confirmation test due to initial elongation>
The toothed belt was spanned between the pulleys (interaxial distance: 900 mm) of the biaxial tester shown in FIG. 6, and the ends were joined together by clamps. After applying a tension of 500 N as an initial tension in a stationary state, the tension was measured every predetermined time. The result is shown in FIG. 7.

In addition, the tension after 168 hours when the initial elongation is assumed to have converged and the tension retention rate with respect to the initial tension at that time were obtained. The results are shown in Table 1.

<Flex resistance test>
1. Bending Test Ten samples were prepared for each of the toothed belts of Examples 1 and 2 and Comparative Examples 1 and 2. Each sample was wound around a round bar having a diameter (bending diameter) of 16 mm, 20 mm, 30 mm, and 40 mm as shown in FIG. 8, held for 10 seconds as it was, and then released.

With respect to each of the released samples, the presence or absence of damage (core breakage) was evaluated by visually observing the core cord inside from the core cord holding groove. If the core wire was found to be damaged even at one place among the 10 samples, it was marked as "x", and if no damage was found at all, it was marked as "○". The results are shown in Table 2.

2. Breaking test For each sample before performing the bending test by winding each sample on a round bar (without bending) and for each sample after releasing the bending test, using a tensile tester (TENSION UTA-50KN), Tensile speed: A tensile test was performed at 50 mm / min, the strengths when the samples were broken were measured, and the average value of 10 samples was obtained. The result is shown in FIG.

  As described above, in both Examples 1 and 2, the initial elongation was significantly improved as compared with Comparative Example 2 using only the steel core wire, and was comparable to Comparative Example 1 using only the glass fiber core wire. The effect of suppressing the initial elongation to some extent was obtained.

  Also in the bending test, in both Examples 1 and 2, no damage to the core wire was observed as in Comparative Example 2 using only the steel core wire, and the breaking strength was the same as Comparative Example 1 using only the glass fiber core wire. It has improved significantly.

  In the above examples, the bending resistance effect was obtained even if the glass fiber core wire was replaced with a fiber core wire made of carbon fiber or a fiber core wire made of aramid fiber.

  Therefore, according to the present invention, it is possible to achieve both suppression of the initial elongation of the core wire and improvement of the bending resistance.

1: Industrial belt 2: Belt body 3: Tooth part 4: Core wire 40: Element wire 40a: Wire 41: Fiber core wire 42: Metal core wire 5: Core holding groove X: Gap

Claims (6)

Inside the belt body, a plurality of fiber-based core wires and a plurality of metal-based core wires are arranged so as to be mixed in the width direction of the belt body ,
Strands constituting the fiber-based core wire is a non-metallic wire made of glass fiber, the diameter is smaller than the strands constituting the metal-based core wire, the fiber-based core wire is An industrial belt characterized in that a gap between strands is smaller than that of the metal-based core .   The distance between the center of gravity of the plurality of fiber-based cores and the center of gravity of the plurality of metal-based cores is 40% or less of the entire width of the belt body. Industrial belt.   The ratio of the number of the fiber-based core wires to the number of the metal-based core wires is: fiber-based core wire: metal-based core wire = 0.75: 1 to 1: 0.75. The industrial belt according to 2.   The said fiber type | system | group core wire and the said metal type | system | group core wire are arrange | positioned symmetrically on the basis of the center of the width direction of the said belt main body, The industrial use in any one of Claims 1-3 characterized by the above-mentioned. belt.   Among the plurality of fiber-based cores and the plurality of metal-based cores, the cores arranged on the outermost edges on both sides of the belt body are the metal-based cores. The industrial belt according to any one of to 4.   The industrial belt according to any one of claims 1 to 5, wherein the belt main body is a toothed belt having a plurality of tooth portions.

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