JP2017172641A - Industrial belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an industrial belt that can be manufactured without increasing the number of steps at the time of manufacturing belt and attain both restriction of initial elongation of a core wire and flex resistance.SOLUTION: Several fibrous core wires 41 and several metallic core wires 42 are arranged in a belt main body 2 in such a way that they may be mixed and present in a width direction of the belt main body 2. It is preferable that a ratio in the number of wires between the fibrous core wires 41 and the metallic core wires 42, fibrous core wires:metallic core wires=0.75:1 to 1:0.75, that the fibrous core wires 41 and the metallic core wires 42 are arranged in a symmetrical manner while a center of the belt main body 2 in its width direction being applied as a reference and that core wires arranged at both ends of the belt main body 2 in its width direction are metallic core wires 42.SELECTED DRAWING: Figure 2

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 can simultaneously suppress the initial elongation of the core wire and improve the bending resistance.

  Industrial belts such as power transmission belts and conveyor belts are embedded with a plurality of core wires extending in the length direction of the belt body in order to impart belt strength and tensile strength.

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

  Such an industrial belt is initially tensioned so that the belt does not slack during use, and this tension imparts initial elongation to the core wire within a few days after the start of use. The initial elongation is permanent elongation that occurs in the core wire at an early stage. Since the core wire is formed by twisting a plurality of strands, the gap between the strands is tightened by the tension applied to the belt, and the core wire is stretched in the process of coming into close contact, resulting in initial elongation. .

  When the initial elongation occurs, the belt tension is lowered. Therefore, in applications where the initial elongation is a problem, it is necessary for the user to re-tighten the belt tension after the initial elongation has converged.

  Generally, in order to suppress the initial elongation, the core after applying tension by reducing the distance between the strands by reducing the diameter of the strands constituting the core, or by reducing the number of twists of the strands. The effect of wire tightening is reduced. In order to reduce the influence of such core wire tightening, the fiber core wire can make the core wire diameter smaller and the space between the strands denser than the metal core wire such as a steel cord. Suitable because it can.

  For example, an industrial belt configured 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-based core wire as a core wire may cause bending fatigue when locally bent. This is considered to be because the fiber core wire has a lower bending strength than the metal core wire.

  Then, this invention makes it a subject to provide the industrial belt which can make compatible suppression of the initial stage elongation of a core wire, and the improvement of a bending resistance.

  The other subject of this invention becomes clear by the following description.

  The above problems are solved by the following inventions.

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

  ADVANTAGE OF THE INVENTION According to this invention, the industrial belt which can make the suppression of the initial stage elongation of a core wire and the improvement of a bending resistance compatible can be provided.

The fragmentary sectional view which shows one Embodiment of the industrial belt which concerns on this invention Sectional drawing which follows the (ii)-(ii) line | wire in FIG. Sectional drawing which follows the (ii)-(ii) line in FIG. 1 explaining a gravity center position by the other arrangement | positioning aspect 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 arrangement | positioning aspect of the core wire in the industrial belt which concerns on this invention Diagram explaining the test method of the tension drop confirmation test due to 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 bending diameter and breaking strength in the breaking test

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a partial cross-sectional view of an industrial belt according to the present invention, and FIG. 2 is a cross-sectional view taken along line (ii)-(ii) in FIG. 3 is a cross-sectional view taken along line (ii)-(ii) in FIG. 1 for explaining the position of the center of gravity according to another arrangement of the core wire 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 a belt main body 2, and the whole is formed of a rubber-like elastic material such as polyurethane.

  Inside the belt main body 2, a plurality of core wires 4 extending along the length direction of the belt main body 2 (left-right direction in FIG. 1) are arranged in the width direction of the belt main body 2 (left-right direction in FIG. 2). It is provided at intervals. Reference numeral 5 in FIG. 1 denotes a core wire pressing groove. The core wire pressing groove 5 is formed by transferring a projection 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 pressing groove 5.

  The core wire 4 is composed of a plurality of fiber core wires 41 and a plurality of metal core wires 42, which 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 deviation in the width direction of the belt body 2. For example, the total number of the fiber cores 41 and the metal cores 42 is equal to each other, and the state in which the fiber cores 41 and the metal cores 42 are alternately arranged every the same number is arranged without deviation. It can be said that.

  Further, the total number of the fiber cores 41 and the metal cores 42 may be different. For example, the two fiber cores 41 and the three metal cores 42 are alternately arranged. It can be said that it is arranged evenly. Furthermore, it can be said that the state in which the one fiber core 41 and the four metal cores 42 are alternately arranged is also arranged without any bias, and can achieve the object of the present invention. It is. Thus, in the case where one or more fiber cores 41 and one or more metal cores 42 are alternately arranged, the number of adjacent fiber cores 41 and metal cores 42 is The difference is preferably 3 or less, 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 plurality of fiber cores 41 and the center of gravity Gb of the plurality of metal cores 42 is closer to zero. This distance L is preferably 40% or less of the entire width W of the belt body 2. In such a state, regardless of the number and thickness of the fiber core 41 and the metal core 42, the deviation of the fiber core 41 and the metal core 42 is small and the object of the present invention is achieved. It is a state that can be.

  The fiber-based core wire 41 and the metal-based core wire 42 arranged inside the belt main body 2 are not limited to those arranged side by side in the width direction as shown in FIG. It may be arranged in a staggered manner (in a staggered manner).

  As a strand which comprises the fiber type core wire 41, the nonmetallic wire which consists of chemical fibers, such as glass fiber (glass fiber), an aramid fiber, carbon fiber, and a polyester fiber, is used.

  As the strands constituting the metallic core wire 42, a wire such as steel or stainless steel is used.

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

  In general, in order to suppress the initial elongation of the core wire 4, it is effective to reduce the gap X between the adjacent strands 40 and 40 by reducing the diameter of the strands 40. From this point of view, the fiber-based core wire 41 is more suitable than the metal-based core wire 42 because the diameter of the strand 40 can be reduced and the strands 40, 40 can be denser. However, since the fiber core 41 has a lower bending strength than the metal core 42, the fiber core 41 alone may reduce the bending resistance of the belt. In particular, in the case of having the cord holding groove 5 as in the industrial belt 1 shown in the present embodiment, the portion of the cord holding groove 5 is thin and the belt rigidity is low, and the cord is exposed. However, it is easy to bend locally at the portion of the core wire pressing 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 body 2, it is possible to exhibit both the performance of suppressing initial elongation and bending resistance. It is possible to suppress a decrease in the bending resistance of the industrial belt 1 using the fiber core 41.

  That is, with respect to the initial elongation, the fiber core wire 41 that hardly causes the initial elongation works dominantly and suppresses the occurrence of the initial elongation of the entire industrial belt 1. On the other hand, regarding the bending resistance, the metal core 42 having high bending rigidity and bending resistance works dominantly, and the metal core 42 is the fiber core even when the belt is locally bent. It supports so that the excessive bending of 41 may be suppressed, and the fall of the bending resistance of the industrial belt 1 is suppressed. Since the fiber-based core wire 41 and the metal-based core wire 42 are arranged so as to be mixed in the width direction of the belt main body 2, it is possible to achieve both the suppression of initial elongation and the improvement of bending resistance in the entire industrial belt 1. be able to.

  In addition, since the industrial belt 1 only needs to be used by mixing the fiber core 41 and the metal core 42 as the core 4, there is no need to change the conventional belt manufacturing process. The number of processes does not increase.

  In the present invention, the ratio of the number of fiber cores 41 and metal cores 42 arranged in parallel in the belt body 2 is as follows: fiber core: metal core = 0.75: 1 to 1: 0. It is preferable that the condition of .75 is satisfied. In this case, when viewed as a whole of the belt main body 2, the number of cores does not extremely deviate, so that the same effects as those of the embodiments described later can be analogized, and the initial elongation is suppressed and the bending resistance is improved. The above-described effect can be exerted to make the entire industrial belt 1 compatible. In addition, although it is inferior to the Example mentioned later also by satisfy | filling the conditions of a fiber type | system | group core wire: metal type | system | group core wire = 0.5: 1-2: 1, although it is inferior to the Example mentioned later, an initial elongation suppression and the improvement of a bending resistance are industrial. The above-described effects that can be achieved by the entire belt 1 can be exhibited.

  In the example shown in FIG. 2, 15 core wires 4 (fiber core wires: metal core wires = 0) including seven fiber core wires 41 and eight metal core wires 42 inside the belt body 2. .875: 1) are mixed and arranged side by side. Three fiber cores 41 are arranged in the center, and two fiber cores 41 and metal cores 42 are alternately arranged on both sides thereof, and the width direction of the belt body 2 as a whole. The fiber-based core wire 41 and the metal-based core wire 42 are arranged without deviation. However, the arrangement of the fiber core 41 and the metal core 42 is not limited to this.

  For example, as shown to Fig.5 (a), the fiber type core wire 41 and the metal type core wire 42 in the arrangement | positioning aspect of FIG. 2 can also be replaced.

  Further, as shown in FIG. 5B, the number of fiber cores 41 and the number of metal cores 42 may be the same number of 8 (fiber core: metal core = 1: 1). it can. In FIG. 5 (b), one metal core 42 is disposed at each end of the belt body 2 in the width direction, and two fiber cores 41 and two metal cores 42 are alternately disposed therebetween. It is arranged.

  5 (a) and 5 (b), the fiber-based core wire 41 and the metal-based core wire 42 are arranged side by side so as to be mixed in the width direction of the belt main body 2, and therefore, similar to the embodiment of FIG. The effect of can be obtained.

  In any of the above arrangement modes, the fiber-based core wire 41 and the metal-based core wire 42 are disposed so as to be symmetric with respect to the center of the belt body 2 in the width direction, which is a preferable embodiment in the present invention. Since the fiber core 41 and the metal core 42 have different characteristics such as the deviation and rotation of the belt, the belts are effectively arranged to prevent the deviation of the belt when traveling. it can.

  By the way, when the belt is running and the both end portions in the width direction interfere with the flange portion of the pulley, the guide rail, and the like, a lifting force is generated at both end portions. If there is concern about interference with the pulley flange, guide rail, etc. during belt travel, as shown in FIG. 2 and FIG. 2 is preferably a metal core 42. The metal-based core wire 42 has higher bending rigidity than the fiber-based core wire 41 and is resistant to local bending, so that durability against bending force acting at the time of rising can be improved.

  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 cores 41 and 42 are not limited. It can be appropriately increased or decreased depending on the diameter of the belt, the width of the belt body 2, and the like.

  Moreover, when using it as a wider industrial belt, you may make it join the industrial belt 1 of the structure shown, for example in FIG. 2, FIG. 5 (a) (b) in the width direction.

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

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

Example 1
Inside the belt body of an end toothed belt made of polyurethane (width: 25 mm), there are 7 glass fiber cores as the fiber core and 8 steel cores as the metal core. 2 was arranged in the same manner as in 2.

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

  The steel core wire was formed by bundling seven steel cords having a diameter of 0.1 mm into strands, and twisting the seven strands.

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

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

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

(Comparative Example 1)
Example 15 was the same as Example 1 except that all 15 cores were glass fiber cores.

(Comparative Example 2)
Example 15 was the same as Example 1 except that all 15 cores were steel cores.

<Tension drop confirmation test due to initial elongation>
A toothed belt was bridged between pulleys (distance between axes: 900 mm) of the biaxial testing machine shown in FIG. 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.

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

<Bend resistance test>
1. Bending test Ten samples of each of the toothed belts of Examples 1 and 2 and Comparative Examples 1 and 2 were prepared. 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 as it was for 10 seconds, and then released.

About each sample after release, the presence or absence of damage (core wire breakage) was evaluated by visually observing the internal wire from the core wire pressing groove. In 10 samples, “X” was indicated when the core wire was damaged even at one location, and “◯” was indicated when no damage was observed. The results are shown in Table 2.

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

  As described above, both Examples 1 and 2 have significantly improved initial elongation as compared with Comparative Example 2 using only a steel core, and are completely comparable to Comparative Example 1 using only a glass fiber core. A degree of initial elongation suppression effect was obtained.

  Also in the bending test, both Examples 1 and 2 showed no damage to the core wire as in Comparative Example 2 in which only the steel core wire was used, and the breaking strength was the same as in Comparative Example 1 in which only the glass fiber core wire was used. Compared to a significant improvement.

  In the above examples, even when 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, a bending resistance effect was obtained.

  Therefore, according to the present invention, it was 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 40: Wire 40a: Wire 41: Fiber core 42: Metal core 5: Core press groove X: Gap

Claims (6)

  An industrial belt characterized in that a plurality of fiber core wires and a plurality of metal 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 center of gravity of the entire plurality of fiber cores and the center of gravity of the plurality of metal cores is 40% or less of the total width of the belt body. Industrial belt.   The ratio of the number of the said fiber type | system | group core wire and the said metal type | system | group core wire is a fiber type | system | group core wire: metal type | system | group core wire = 0.75: 1-1: 0.75, It is characterized by the above-mentioned. 2. The industrial belt according to 2.   The industrial fiber according to any one of claims 1 to 3, wherein the fiber-based core wire and the metal-based core wire are disposed symmetrically with respect to a center in the width direction of the belt body. belt.   2. The core wire disposed at the outermost edge on both sides of the belt body among the plurality of fiber core wires and the plurality of metal core wires is the metal core wire. The industrial belt in any one of -4.   The industrial belt according to any one of claims 1 to 5, wherein the belt body is a toothed belt having a plurality of tooth portions provided on the belt body.

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