JP5504580B2 - Conveyor belt - Google Patents

Description

  The present invention relates to a conveyor belt, and more particularly to a conveyor belt that can ensure high productivity without impairing the buckling resistance.

  As a core material of a conveyor belt, a single or a plurality of laminated fiber reinforced layers having a plain weave structure are frequently used. In the fiber reinforced layer having a plain weave structure, the warp yarn and the weft yarn are generally structured such that a multifilament yarn is twisted several tens of times.

  For this reason, the wire diameters of the warp and the weft become thick, and the fiber reinforcement layer covered with rubber inevitably becomes thick, so that the structure is disadvantageous for the buckling resistance. Moreover, since the coating rubber layer is also thick, energy consumption when operating the conveyor belt is increased. Furthermore, since a step of imparting twist is required, it is disadvantageous for improving productivity.

Here, productivity can be improved by omitting the twisting step and making the warp yarn and the weft yarn non-twisted. For example, although the object is different from that of the present invention, a conveyor belt using a non-twisted yarn as a yarn (weft) constituting a fiber reinforcement layer has been proposed (see Patent Document 1). However, if the warp and weft yarns are simply untwisted, the weft yarns are likely to be flattened, resulting in a new problem that the warp crimp (up and down curvature) is reduced and the buckling resistance deteriorates. Become.
Japanese Utility Model Publication No. 7-35414

  The objective of this invention is providing the conveyor belt which can ensure high productivity, without impairing buckling resistance.

In order to achieve the above object, a conveyor belt according to the present invention is a conveyor belt having a plain woven structure fiber reinforcing layer as a core material between an upper rubber layer and a lower rubber layer , wherein the warp and weft of the fiber reinforcing layer Are formed by a substantially non-twisted multifilament yarn in which a plurality of filament yarns in a state of untwisted raw yarns that are not forcibly twisted are aligned and combined , and 1 / of the prescribed tensile strength. The elongation at 10 loads is 0.9% or more and 2.4% or less , and the tensile cut elongation is 25% or more and 40% or less.

Here, a plurality of plain-woven structure fiber reinforcement layers are laminated, and warp yarns and weft yarns are substantially untwisted only for the fiber reinforcement layer on the innermost side of the plurality of fiber reinforcement layers. It is also possible to make a specification in which the elastic modulus of the warp yarn of the fiber reinforcement layer which is constituted by the filament yarn and becomes the innermost peripheral side is 10 GPa or more.
Further, for the fiber reinforcing layer in which the warp and weft are made of a substantially non-twisted multifilament yarn, the outer diameter of each filament yarn is the same for the warp and the weft, and the number of the filament yarns of the weft Increase the number of filament yarns, or use the same number of filament yarns for the warp and weft yarns, and make the outer diameter of the weft filament yarn larger than the outer diameter of the warp filament yarn. You can also.

  According to the conveyor belt of the present invention, the warp yarns and the weft yarns of the fiber reinforcement layer are each composed of a substantially non-twisted multifilament yarn, thereby eliminating the need for a twisting step and improving the productivity. . Also, by setting the elongation at 1/10 load of the specified tensile strength of the conveyor belt to 0.5% to 2.5% and the tensile cut elongation to 25% to 40%, Therefore, even when the warp crimps are reduced due to the non-twisting of the warp and weft yarns of the fiber reinforcement layer, this moderate elongation relieves the compressive stress and reduces the buckling resistance. A decrease can be avoided.

  Hereinafter, the conveyor belt of the present invention will be described based on the embodiments shown in the drawings.

  As illustrated in FIGS. 1 and 2, the conveyor belt 1 of the present invention has four fiber reinforcing layers 4 a, 4 b, 4 c, and 4 d serving as a core material between the upper rubber layer 2 and the lower rubber layer 3. It is buried and configured. The number of laminated fiber reinforced layers 4 is determined by the required performance (rigidity, elongation, etc.) for the conveyor belt 1, and is not limited to four layers, but may be a single layer or other plural layers. These fiber reinforcement layers 4a to 4d have a plain weave structure in which warp yarns 5 extending in the belt longitudinal direction and weft yarns 6 extending in the belt width direction are alternately crossed up and down, and all the layers have the same specifications.

  As illustrated in FIG. 3, the warp yarn 5 and the weft yarn 6 constituting the fiber reinforcement layer 4 are each a plurality of filament yarns 5a and 6a, which are substantially aligned in a non-twisted state. It is composed of a non-twisted multifilament yarn. Substantially no twist means a state in which twist is not compulsorily applied, that is, a so-called twisted state of raw yarn. The number of filament yarns 5a and 6a constituting the warp yarn 5 and the weft yarn 6 is a plurality determined as appropriate.

  By using the warp yarn 5 and the weft yarn 6 thus made non-twisted, the step of imparting twist is not necessary, so that high productivity can be ensured as compared with the case of using a warp yarn and a weft yarn having a twisted structure. Further, along with the non-twisting, the diameters of the warp yarn 5 and the weft yarn 6 are suppressed, and the fiber reinforcing layer 4 covering these with rubber can be made thin, so that a structure advantageous for buckling resistance is obtained. Moreover, since the coating rubber layer of the fiber reinforcement layer 4 can also be made thin, the energy consumption at the time of operating the conveyor belt 1 can be made small.

  The warp yarn 5 and the weft yarn 6 can have the same structure (the same outer diameter and the same number of filament yarns 5a and 6a), and the outer diameter and the number of the filament yarns 5a and 6a can be changed. When the outer diameters of the filament yarns 5a and 6a are the same in the warp yarn 5 and the weft yarn 6, the number of filament yarns 6a of the weft yarn 6 is made larger than the number of filament yarns 5a of the warp yarn 5 Since the crimp of the warp 5 can be made relatively large, it is advantageous for improving the buckling resistance. When the number of filament yarns 5a and 6a is the same for the warp yarn 5 and the weft yarn 6, the outer diameter of the filament yarn 6a of the weft yarn 6 is made larger than the outer diameter of the filament yarn 5a of the warp yarn 5a. Since the crimp of the warp 5 can be made relatively large, it is advantageous for improving the buckling resistance.

  Further, in the present invention, the elongation at 1/10 load of the specified tensile strength of the conveyor belt 1 is set to 0.5% to 2.5%, and the tensile cut elongation is set to 25% to 40%. ing. The specified tensile strength of the conveyor belt 1 is described in, for example, JIS K6322 (section 5.1.2, property of cloth layer, etc.).

  As illustrated in FIG. 4, the conveyor belt 1 is exemplified by FIG. 4 by setting the elongation at 1/10 load of the tensile strength to 0.5% or more and 2.5% or less and the tensile cut elongation to 25% or more. When stretched between the pulleys 7 and passing around the pulleys 7, moderate elongation occurs. Therefore, even if the crimp of the warp 5 is reduced by the non-twisting of the warp 5 and the weft 6 of the fiber reinforcement layer 4, the buckling stress generated in the warp 5 is relaxed by this moderate elongation, and the buckling resistance is lowered. Can be avoided. On the other hand, by setting the tensile cut elongation to 40% or less, the pulley 7 is prevented from slipping when the conveyor belt 1 is operated.

  Various materials such as polyester, aramid, vinylon, and nylon can be used for the warp yarn 5 and the weft yarn 6, but a material having an elastic modulus of 10 GPa or more is used for the warp yarn 5 in order to ensure a certain degree of rigidity. Polyester is preferred.

  As illustrated in FIG. 4, the conveyor belt 1 is stretched between pulleys 7, and when the conveyor belt 1 passes around the pulleys 7, the fiber reinforcement on the innermost peripheral side in the fiber reinforcement layer 4. Since the maximum compressive stress is generated in the layer 4a, the layer 4a is most easily buckled. Therefore, in the case where a plurality of fiber reinforcement layers 4 are laminated, the warp yarn 5 and the weft yarn 6 are constituted by substantially non-twisted multifilament yarns only for the fiber reinforcement layer 4a on the innermost peripheral side. It can also be. Alternatively, the fiber reinforcement layer 4 in which the warp yarn 5 and the weft yarn 6 are each composed of a substantially non-twisted multifilament yarn is applied to at least one innermost fiber reinforcement layer 4a.

  The warp yarn is made of polyester, the weft yarn is made of nylon, each is made of a multifilament yarn, and a fiber reinforced layer of a plain weave structure coated with rubber of a predetermined thickness. A test sample having a common specification of about 9 mm in thickness sandwiched between an upper rubber layer having a thickness of 3 mm and a lower rubber layer having a thickness of 2 mm was prepared. At that time, seven types of test samples in which the twisted structure of warp and weft, the elongation at 1/10 load of the specified tensile strength, and the tensile cut elongation were changed as shown in Table 1 (Example 1) -3, Conventional Example 1 and Comparative Examples 1-3) were prepared, and each test sample was evaluated for buckling resistance, slip resistance, and productivity, and the results are shown in Table 1. The elongation at the time of 1/10 load of the above specified tensile strength, and the tensile cut elongation are values obtained in accordance with the tensile test specified in 9.3.5 of JIS K6322: 1999. It is. In the conventional example, the warp yarn and the weft yarn have a single twist structure.

[Crimp resistance]
The state of the fiber reinforcing layer laminated on the innermost side when the test sample was wound 180 ° around a pulley having a diameter of 200 mm was confirmed. The case where the innermost fiber reinforcing layer followed along the peripheral surface of the pulley was evaluated as ◯, and the case where the warp yarn was easily bent and the warp yarn was easily bent was evaluated as ×.

[Slip resistance]
When it was stretched between the pulleys of the test sample and operated, the case where no slip occurred on the pulley was indicated as “Good”, and the case where slip occurred and there was a practical problem was indicated as “Poor”.

[productivity]
A case where the warp yarn and the weft yarn of the fiber reinforcement layer are each composed of a substantially non-twisted multifilament yarn is considered as good productivity, and a case where the warp yarn and the weft yarn are not twisted is necessary. Therefore, it is indicated by × because productivity is poor.

  From the results in Table 1, the warp and weft yarns of the fiber reinforced layer are composed of substantially untwisted multifilament yarns, and the elongation at 1/10 load of the specified tensile strength of the conveyor belt set in the present invention is Conveyors with excellent buckling resistance, slip resistance and productivity by satisfying the specifications satisfying the range (0.5% to 2.5%) and the tensile cut elongation range (25% to 40%) It was confirmed that a belt could be obtained.

It is sectional drawing which illustrates the internal structure of the conveyor belt of this invention. It is a perspective view which illustrates the conveyor belt of FIG. It is explanatory drawing which illustrates the structure of the warp and the weft which comprise the fiber reinforcement layer of FIG. FIG. 2 is a side view illustrating a state in which the conveyor belt of FIG. 1 is stretched between pulleys.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Conveyor belt 2 Upper rubber layer 3 Lower rubber layer 4, 4a, 4b, 4c, 4d Fiber reinforcement layer 5 Warp yarn 5a Filament yarn 6 Weft yarn 6a Filament yarn 7 Pulley

Claims (3)

A conveyor belt having a plain woven fiber reinforcing layer as a core material between an upper rubber layer and a lower rubber layer , wherein the warp and weft of the fiber reinforcing layer are not forcibly twisted , respectively . 1. It is composed of a substantially untwisted multifilament yarn in which a plurality of filament yarns in a raw yarn twist state are aligned and combined , and the elongation at a load of 1/10 of the specified tensile strength is 0.9% or more. A conveyor belt characterized by being 4% or less and having a tensile cut elongation of 25% or more and 40% or less.   Multiple fiber reinforced layers of plain weave structure are laminated, and only the fiber reinforced layer on the innermost side of the plurality of fiber reinforced layers, warp yarns and weft yarns are each made of a substantially untwisted multifilament yarn. The conveyor belt according to claim 1, wherein the elastic modulus of the warp yarn of the fiber reinforcing layer which is configured and located on the innermost peripheral side is 10 GPa or more.   For the fiber reinforcing layer in which the warp and weft are composed of substantially non-twisted multifilament yarns, the outer diameter of the filament yarn is the same for the warp and the weft, and the number of the weft filament yarns is the warp filament yarn. The number of filament yarns of warp and weft is the same, and the outer diameter of the filament yarn of the weft is larger than the outer diameter of the warp filament yarn. The conveyor belt described.

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