Conveyor belt

Abstract

To provide a conveyor belt capable of preventing damage to a fiber substrate provided at a joint portion more effectively than the prior art.SOLUTION: The conveyor belt includes a joint portion 11A at an end 12A of a belt main body 12. The joint portion 11A has a structure in which an end portion 13B of a fiber substrate 13, which forms the boundary between the belt main body 12 and the fiber substrate 13, is covered with a covering layer 16. The conveyor belt can prevent the end portion 13B of the fiber substrate 13 from peeling off due to the covering layer 16, and can prevent damage to the fiber substrate 13 provided at the joint portion 11A more effectively than the prior art.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a conveyor belt. [Background technology]

[0002] A lacing joint is known as a method for making a belt-shaped conveyor belt endless (see, for example, Patent Document 1). A lacing joint has multiple ring-shaped joint members provided at both longitudinal ends of a conveyor belt body. The lacing joint is arranged so that the pin insertion holes of the multiple ring-shaped joint members provided at both ends align along the width direction of the belt body by butting the ends together. The conveyor belt becomes endless by connecting pins inserted into the multiple pin insertion holes that align along the width direction of the belt body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Microfilm of the specification and drawings attached to the application for Utility Model Application No. 59-43029 (Unexamined Utility Model Application No. 60-154643) (issued by the Japan Patent Office on October 15, 1985) Summary of the Invention [Problem to be solved by the invention]

[0004] The joint portion has a ring-shaped joint member attached to the tip of a strip-shaped fiber substrate formed from canvas or the like. The fiber substrate is superimposed and joined on the surface of the belt body that contacts the pulley or support plate so that the ring-shaped joint member is located at the end of the belt body. Therefore, when the conveyor belt is rotated by the rotational drive of the pulley of the conveyor equipment, the fiber substrate repeatedly comes into contact with the pulley or support plate, causing a load to be generated at the joint between the belt body and the fiber substrate. As a result, with long-term use of the conveyor belt, the fiber substrate superimposed on the surface of the belt body gradually peels off, potentially damaging the fiber substrate provided at the joint portion.

[0005] An object of the present invention is to provide a conveyor belt that can prevent breakage of a fiber base material provided at a joint portion more effectively than conventional belts. [Means for solving the problem]

[0006] The conveying belt of the present invention is a conveying belt in which a plurality of ring-shaped joint members are provided at one end of a belt-shaped belt body in the longitudinal direction and a plurality of ring-shaped joint members are provided at the other end of the belt body in the longitudinal direction, and these are engaged with each other, and a connecting pin is inserted into the one and other of the plurality of ring-shaped joint members aligned with each other in the width direction of the belt body, thereby connecting the ends of the belt body together.The one and other ends of the belt body have a pair of joint portions, and the joint portions include the plurality of ring-shaped joint members made of resin, a belt-shaped fiber base material on which the plurality of ring-shaped joint members are provided and which is joined onto the surface of the belt body, and a coating layer that covers the boundary between the fiber base material and the surface of the belt body in the longitudinal direction of the belt body. [Effects of the Invention]

[0007] According to the present invention, the boundary between the fiber base material and the surface of the belt body to which the fiber base material is joined is covered with a coating layer, which reduces the load applied to the boundary between the fiber base material and the belt body, thereby making it possible to prevent damage to the fiber base material provided at the joint portion more effectively than in the past. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic side view showing the configuration of a conveying facility using a conveying belt according to an embodiment of the present invention. [Figure 2] 4 is a plan view of a connecting portion of the conveyor belt according to the embodiment, seen from the back side. FIG. [Figure 3] 1 is a side cross-sectional view illustrating a side cross-sectional configuration of a conveyor belt according to an embodiment of the present invention, focusing on one end of a belt body where a joint portion is provided. FIG. [Figure 4] FIG. 10 is a side cross-sectional view showing a side cross-sectional configuration (1) of a conveyor belt according to another embodiment, focusing on one end of a belt body where a joint portion is provided. [Figure 5] FIG. 10 is a side cross-sectional view showing a side cross-sectional configuration (2) of a conveyor belt according to another embodiment, focusing on one end of a belt body where a joint portion is provided. [Figure 6] FIG. 1 is a schematic side view showing the configuration of a transport facility used in a verification test. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description, the same components are denoted by the same reference numerals, and redundant description will be omitted.

[0010] <Outline of conveying equipment using conveying belt according to this embodiment> FIG. 1 is a schematic side view showing the configuration of a conveying equipment 100 using a conveying belt 1 according to this embodiment. First, a brief description will be given of the conveying equipment 100 using the conveying belt 1 according to this embodiment. The conveying equipment 100 includes the conveying belt 1, a driving pulley 2, and a driven pulley 3. The driving pulley 2 is connected to the rotation shaft of a driving source such as a motor (not shown), and rotates as the driving source rotates the rotation shaft. The driven pulley 3 is disposed apart from the driving pulley 2, and rotates in conjunction with the rotation of the driving pulley 2. The driving pulley 2 and the driven pulley 3 will be simply referred to as pulleys 2 and 3 unless otherwise specified.

[0011] The conveyor belt 1 has a connecting portion 11 that connects the longitudinal ends of the conveyor belt 1, and is formed into an endless shape by the connecting portion 11. The conveyor belt 1 is wound around pulleys 2 and 3 by being endless. The conveyor belt 1 rotates in conjunction with the rotational drive of the pulleys 2 and 3. As a result, the conveyor belt 1 conveys, for example, an object (not shown) placed on a surface 1A of the conveyor belt 1 in the rotation direction (for example, the direction of the arrow shown in FIG. 1).

[0012] In the following description, the surface on which the transported object is placed is referred to as the front surface 1A of the conveyor belt 1, and the surface that comes into contact with the pulleys 2 and 3 when the conveyor belt 1 is wrapped around the pulleys 2 and 3 is referred to as the back surface 1B of the conveyor belt 1.

[0013] <Conveyor belt connection structure> Next, the connection structure of the conveyor belt 1 according to this embodiment will be briefly described with reference to Fig. 2. Fig. 2 is a plan view of the connection portion 11 of the conveyor belt 1 according to this embodiment, viewed from the back surface 1B. As shown in Fig. 2, the conveyor belt 1 is formed in an endless shape by connecting end portions 12A and 12B of a belt-like belt main body 12 to each other by the connection portion 11.

[0014] In the following description, the longitudinal direction of the belt body 12 is referred to as T (hereinafter referred to as the longitudinal direction T), and the width direction of the belt body 12 perpendicular to the longitudinal direction T is referred to as W (hereinafter referred to as the width direction W). The thickness direction of the belt body 12 is the direction perpendicular to the longitudinal direction T and the width direction W.

[0015] The conveyor belt 1 has one joint portion 11A at one end portion 12A in the longitudinal direction T of the belt body 12, and the other joint portion 11B at the other end portion 12B in the longitudinal direction T of the belt body 12. The connecting portion 11 of the conveyor belt 1 is formed by connecting the one joint portion 11A and the other joint portion 11B.

[0016] A plurality of ring-shaped joint members 14 are provided at one joint portion 11A at one end portion 12A of the belt body 12. A plurality of ring-shaped joint members 14 are also provided at the other end portion 12B of the belt body 12 at the other joint portion 11B. The ring-shaped joint members 14 provided at each of the pair of joint portions 11A, 11B are made of resin and have the same configuration. The ring-shaped joint members 14 are provided with pin insertion holes (not shown in FIG. 2) that pass through in the width direction W of the belt body 12.

[0017] One end 12A, 12B of the belt body 12 is butted against the other end 12A, and a plurality of ring-shaped joint members 14 provided at one end 12A are meshed with a plurality of ring-shaped joint members 14 provided at the other end 12B. The pin insertion holes of the meshed ring-shaped joint members 14 mate with each other along the width direction W of the belt body 12. The conveyor belt 1 can be made endless by inserting resin connecting pins 15 from the width direction W into the pin insertion holes of the one and other plurality of ring-shaped joint members 14, connecting the ends 12A, 12B of the belt body 12 to each other.

[0018] <Belt body configuration> Next, we will explain the configuration of the belt body 12. The belt body 12 is, for example, a single layer body made of a strip-shaped resin layer or a canvas layer, or a laminate body made by overlapping a strip-shaped resin layer and a canvas layer in the thickness direction. The thickness of the belt body 12 is, for example, 0.5 mm to 10 mm.

[0019] 3 is a side cross-sectional view showing the cross-sectional configuration of the conveyor belt 1 according to this embodiment, focusing on one end 12A of the belt body 12, where the joint portion 11A is provided. In this embodiment, the configuration of one end 12A of the belt body 12, where one joint portion 11A is provided, and the configuration of the other end 12B of the belt body 12, where the other joint portion 11B is provided, are the same. Therefore, to avoid duplication of explanation, the following description will focus on the configuration of one end 12A of the belt body 12 and one joint portion 11A.

[0020] In this embodiment, the surface of the belt body 12 is the surface 1A of the conveyor belt 1, and the back surface of the belt body 12 is the back surface 1B of the conveyor belt 1 that comes into contact with the pulleys 2 and 3 (FIG. 1). Therefore, the surface 1A of the conveyor belt 1 will be referred to as the surface 1A of the belt body 12, and the back surface 1B of the conveyor belt 1 will be referred to as the back surface 1B of the belt body 12.

[0021] As shown in Fig. 3, a step portion 121 is formed at the end 12A of the belt body 12 by cutting the back surface 1B, which comes into contact with the pulleys 2 and 3 (Fig. 1), in the thickness direction. As shown in Fig. 3, the step portion 121 is formed in a rectangular shape extending a predetermined distance in the longitudinal direction T from the end 12A of the belt body 12. A length dimension D1 from the end 12A of the belt body 12 to the step portion 121 in the longitudinal direction T is, for example, 30 mm or more and 110 mm or less. A depth dimension T1 of the step portion 121 is based on the back surface 1B of the belt body 12 at a position where the joint portion 11A is not provided, and is, for example, 0.2 mm or more and 2.0 mm or less from the back surface 1B.

[0022] <Joint configuration> Next, the joint portion 11A according to this embodiment will be described with reference to Figures 2 and 3. As described above, the pair of joint portions 11A, 11B have the same configuration. Therefore, to avoid repetition, the following description will focus on one of the joint portions 11A. The joint portion 11A is provided at the end portion 12A of the belt body 12. The joint portion 11A has the same width as the dimension (width dimension) of the belt body 12 in the width direction W, and is disposed so as to overlap the step surface 121A of the step portion 121 of the belt body 12. The joint portion 11A includes a fiber base material 13, a plurality of ring-shaped joint members 14, and a coating layer 16.

[0023] The ring-shaped joint member 14 is provided at the base material tip portion 13A of the fiber base material 13. As shown in Fig. 2, the ring-shaped joint member 14 is arranged so as to protrude from the ends 12A, 12B of the belt body 12 along the width direction W of the belt body 12. The ring-shaped joint member 14 has a pin insertion hole 14A into which a connecting pin 15, which is a rod-shaped body made of resin, can be inserted in the width direction W of the belt body 12.

[0024] When one end 12A and the other end 12B of the belt body 12 are butted against each other, the ring-shaped joint members 14 arranged at a predetermined interval along the width direction W at one end 12A of the belt body 12 and the ring-shaped joint members 14 arranged at a predetermined interval along the width direction W at the other end 12B of the belt body 12 are interlocked so as to be alternately arranged along the width direction W of the belt body 12. One connecting pin 15 is inserted into each of the pin insertion holes 14A aligned linearly along the width direction W of the belt body 12 in the one and other ring-shaped joint members 14. In this way, the pair of joint portions 11A, 11B connect the ends 12A, 12B of the belt body 12 to each other.

[0025] The fiber base material 13 includes a woven fabric 110. The fiber base material 13 may be formed by immersing the woven fabric 110 in resin. The woven fabric 110 has a plurality of weft yarns 111 extending along the width direction W of the belt body 12 and a plurality of warp yarns 112 extending along the longitudinal direction T of the belt body 12. The fiber base material 13 has a plurality of ring-shaped joint members 14 arranged at a predetermined interval at the base material tip portion 13A along the width direction W. The fiber base material 13 is joined to the step surface 121A of the step portion 121 so that the plurality of ring-shaped joint members 14 at the base material tip portion 13A protrude from the end portion 12A of the belt body 12 in the longitudinal direction T.

[0026] The fiber base material 13 extends in the longitudinal direction T from the end 12A of the belt body 12 to the back surface 1B of the belt body 12 at a position beyond the stepped portion 121 of the belt body 12. The base material end 13B of the fiber base material 13 is located at a position farther from the end 12A of the belt body 12 than the stepped portion 121 in the longitudinal direction T. The fiber base material 13 is superimposed and joined to the stepped surface 121A of the belt body 12 and the back surface 1B of the belt body 12 at a non-step surface (a position where the joint portion 11A is not provided) beyond the stepped portion 121. In this embodiment, the dimension D2 from the stepped portion 121 of the belt body 12 to the base material end 13B of the fiber base material 13 located on the back surface 1B of the belt body 12 after the fiber base material 13 has overcome the stepped portion 121 in the longitudinal direction T is, for example, 3 mm or more and 15 mm or less.

[0027] The coating layer 16 is made of, for example, a silicone-based or polyurethane-based sealant (also referred to as a caulking agent) and is formed by curing a liquid or gel-like sealant. The coating layer 16 according to this embodiment is formed by, for example, applying a liquid silicone-based sealant in a layer from the surface of the fiber substrate 13 to the back surface 1B of the belt body 12 and curing it at room temperature without pressure. It is desirable that the coating layer 16 has flexibility sufficient to accommodate the expansion and contraction of the belt body 12 even after curing. The coating layer 16 covers the entire width direction W of the belt body 12, from the surface of the fiber substrate 13 bonded to the stepped surface 121A of the belt body 12, over the substrate end 13B of the fiber substrate 13 that is the boundary between the fiber substrate 13 and the back surface 1B of the belt body 12, and along the longitudinal direction T of the belt body 12.

[0028] The covering layer 16 is disposed on the side of one end 12A of the belt body 12, and one layer end 161 of the covering layer 16 is disposed on a step surface 121A between one end 12A of the belt body 12 and the step portion 121 of the belt body 12. The other layer end 162 of the covering layer 16 faces the one layer end 161 of the covering layer 16 and is farther from the one end 12A of the belt body 12 than the layer end 161, and is disposed on the back surface 1B of the belt body 12.

[0029] The covering layer 16 is formed so as to completely fill the stepped space formed at the boundary between the fiber base material 13 and the belt body 12 in the longitudinal direction T, between the base material end 13B of the fiber base material 13 and the back surface 1B of the belt body 12. As a result, the covering layer 16 covers the base material end 13B of the fiber base material 13 so as to bring the base material end 13B into close contact with the back surface 1B of the belt body 12. Furthermore, the covering layer 16 prevents the base material end 13B of the fiber base material 13 from being exposed to the outside, thereby preventing external forces from being applied directly to the base material end 13B of the fiber base material 13.

[0030] The surface of the coating layer 16 has an inclined surface 16A that slopes from the region where the substrate end 13B of the fiber substrate 13 rides on the back surface 1B of the belt body 12 toward the back surface 1B of the belt body 12 along the longitudinal direction T of the belt body 12. The inclined surface 16A of the coating layer 16 slopes from the region where the substrate end 13B of the fiber substrate 13 rides on the back surface 1B of the belt body 12 toward the surface of the fiber substrate 13 on the end 12A side of the belt body 12 along the longitudinal direction T of the belt body 12. The coating layer 16 according to this embodiment is formed by applying a liquid, gel, paste, or semi-solid sealant to the surface of the fiber substrate 13 or the back surface 1B of the belt body 12 and allowing it to harden, and therefore has a gently sloping surface 16A on the surface, unlike a tape-shaped member.

[0031] The thickness of the coating layer 16 on the substrate end portion 13B of the fiber substrate 13 is preferably 0.2 mm or more and 1.5 mm or less. The thickness of the coating layer 16 is preferably the average value when the substrate end portion 13B of the fiber substrate 13 on which the coating layer 16 is provided is cut in the width direction W of the belt body 12 and the thickness of the coating layer 16 at the cut point is measured in the width direction W. If the thickness of the coating layer 16 is less than 0.2 mm, problems such as the coating layer 16 being easily worn away may occur, and if the thickness of the coating layer 16 exceeds 1.5 mm, problems such as the coating layer 16 being easily cracked may occur.

[0032] <Method for manufacturing conveyor belt> Next, a method for manufacturing the above-described conveyor belt 1 will be described. A strip-shaped belt body 12 having a predetermined length and width is prepared. Next, the back surface 1B of the belt body 12 is cut by cutting from the ends 12A, 12B of the belt body 12 to a length dimension D1, thereby forming a step portion 121 having a length dimension D1 from the ends 12A, 12B of the belt body 12 and a depth dimension T1.

[0033] Next, a fiber base material 13 having a plurality of ring-shaped joint members 14 attached to a base material tip portion 13A is prepared. Next, the fiber base material 13 is positioned on each of the stepped surfaces 121A of the ends 12A and 12B of the belt body 12 so that the ring-shaped joint members 14 protrude from the ends 12A and 12B of the belt body 12. Next, the fiber base material 13 is pressed against the stepped surfaces 121A of the belt body 12 and the back surface 1B of the belt body 12 while being heated at a predetermined temperature using a press machine, thereby adhering and fixing the fiber base material 13 to the stepped surfaces 121A and the back surface 1B of the belt body 12.

[0034] Next, a liquid or gel-like sealant is applied from the surface of the fiber substrate 13 bonded to the stepped surface 121A of the belt body 12, over the substrate end 13B of the fiber substrate 13 at the boundary between the fiber substrate 13 and the back surface 1B of the belt body 12, and across the entire width direction W of the belt body 12 along the longitudinal direction T of the belt body 12. It is desirable to apply the sealant so as to completely fill the gaps in the stepped portion between the substrate end 13B of the fiber substrate 13 and the back surface 1B of the belt body 12, which is formed at the boundary between the fiber substrate 13 and the belt body 12. The applied sealant is then left for a predetermined time to harden and form a coating layer 16. In this manner, the conveyor belt 1 according to this embodiment can be manufactured.

[0035] <Action and effect> According to this embodiment, the conveyor belt 1 has a configuration in which the substrate end 13B of the fiber substrate 13, which is the boundary between the belt main body 12 and the fiber substrate 13, is covered with a coating layer 16. As a result, in the conveyor belt 1, the substrate end 13B of the fiber substrate 13 is covered with the coating layer 16, and the substrate end 13B can be kept unexposed, thereby preventing direct application of external force to the substrate end 13B of the fiber substrate 13. Furthermore, the conveyor belt 1 can cover the substrate end 13B of the fiber substrate 13 with the coating layer 16 so that the substrate end 13B of the fiber substrate 13 is in close contact with the back surface 1B of the belt main body 12. As described above, the conveyor belt 1 can prevent the substrate end 13B of the fiber substrate 13 from turning over due to the coating layer 16. Therefore, the conveyor belt 1 can more effectively prevent damage to the fiber substrate 13 provided at the joint portions 11A and 11B than conventional belts.

[0036] The coating layer 16 is positioned on the end 12A side of the belt body 12 in the longitudinal direction T, with one layer end 161 of the coating layer 16 located between the end 12A of the belt body 12 and the step portion 121. The other layer end 162 of the coating layer 16, which is located farther from the end 12A of the belt body 12 than the one layer end 161 of the coating layer 16 in the longitudinal direction T, is positioned farther from the end 12A of the belt body 12 than the substrate end 13B of the fiber substrate 13 that rides up on the back surface 1B of the belt body 12. This allows the coating layer 16 to reliably cover the substrate end 13B of the fiber substrate 13, which is the boundary between the belt body 12 and the fiber substrate 13.

[0037] In the conveyor belt 1, a liquid or gel sealing agent is applied across the substrate end 13B of the fiber substrate 13 in the longitudinal direction T, and then cured to form a coating layer 16, thereby forming an inclined surface 16A on the surface of the coating layer 16. When the conveyor belt 1 is endless and wound around the pulleys 2 and 3 and driven to rotate, the gently inclined surface 16A of the coating layer 16 can be brought into contact with the pulleys 2 and 3 without the corners of the substrate end 13B of the fiber substrate 13 coming into contact with the pulleys 2 and 3.

[0038] Furthermore, in the conveyor belt 1, a fiber base material 13 having a thickness equal to the depth dimension T1 of the step portion 121 is disposed on a step surface 121A formed on the back surface 1B of the end portions 12A and 12B of the belt body 12, and the base material end portion 13B of the fiber base material 13 climbs over the step portion 121 and is joined to the back surface 1B of the belt body 12. This prevents the fiber base material 13 disposed on the step surface 121A of the belt body 12 from significantly bulging out from the back surface 1B at the end portions 12A and 12B of the belt body 12. This accordingly reduces unevenness on the back surface 1B of the conveyor belt 1 and also suppresses bulging of the coating layer 16 at the step surface 121A.

[0039] A known joint uses a metal ring-shaped joint member. When an endless conveyor belt is rotated, the high-hardness metal ring-shaped joint member repeatedly contacts the pulleys and the conveyed object that constitute the conveyor equipment, potentially damaging the pulleys and the conveyed object. In contrast, the joints 11A and 11B according to this embodiment use a low-hardness resin ring-shaped joint member 14. This reduces damage to the pulleys 2 and 3 by using a resin member that is softer than a metal member.

[0040] <Other embodiments> The present invention is not limited to the above-described embodiment and includes the following modifications. In the above-described embodiment, a step portion 121 having an inverted L-shaped cross section is formed between a step surface 121A formed on the end portions 12A and 12B of the belt body 12 and the back surface 1B of the belt body 12, which is a non-step surface. However, the present invention is not limited to this. For example, as shown in FIG. 4 , in which the same reference numerals are used to designate corresponding parts to those in FIG. 3 , a joint portion 11A according to another embodiment may have a step portion 421 formed as a gently inclined surface between the step surface 121A formed on the end portion 12A of the belt body 12 and the back surface 1B of the belt body 12, which is a non-step surface. In this case, the back surface of the fiber base material 13 can be reliably bonded to the inclined step portion 421, which facilitates bonding. This allows the fiber base material 13 to be firmly bonded to the step portion 421, thereby reducing the fluctuating load from the fiber base material 13 to the coating layer 16.

[0041] 5, in which the same reference numerals are assigned to parts corresponding to those in FIG. 3, a joint portion 11A according to another embodiment may have a stepped portion 521 formed in a staircase pattern along the longitudinal direction T of the belt body 12 between a stepped surface 121A formed on the end portion 12A of the belt body 12 and the back surface 1B of the belt body 12, which is a non-step surface. Even when such a stepped portion 521 is provided on the ends 12A, 12B of the belt body 12, the fiber base material 13 can be joined to the back surface 1B of the belt body 12 by overcoming the stepped portion 521, and the boundary between the base material end portion 13B of the fiber base material 13 overcoming the stepped portion 521 and the back surface 1B of the belt body 12 can be covered with the coating layer 16.

[0042] In the above-described embodiment, the step portion 121 and the step surface 121A are formed on the back surface 1B of the belt body 12, and the fiber base material 13 is superimposed on and bonded to the step surface 121A. However, the present invention is not limited to this. For example, the fiber base material 13 may be superimposed on and bonded directly to the back surface 1B of the belt body 12, without forming the step portion 121 and the step surface 121A on the back surface 1B of the belt body 12.

[0043] In the above-described embodiment, the fiber base material 13 has a thickness equal to the depth T1 of the stepped portion 121 formed on the back surface 1B of the end portions 12A and 12B of the belt body 12, and the thickness direction of the surface of the fiber base material 13 arranged on the stepped surface 121A of the belt body 12 is aligned with the thickness direction of the back surface 1B of the belt body 12, which is a non-step surface. However, the present invention is not limited to this. In another embodiment, for example, the fiber base material 13 may have a thickness smaller than the depth T1 of the stepped portion 121 formed on the back surface 1B of the end portions 12A and 12B of the belt body 12. In this case, since the thickness of the fiber base material 13 is smaller than the depth T1 of the stepped portion 121, the thickness direction of the surface of the fiber base material 13 arranged on the stepped surface 121A of the belt body 12 can be lower than the thickness direction of the back surface 1B of the belt body 12, which is a non-step surface. This can suppress the bulging of the coating layer 16 provided on the surface of the fiber base material 13.

[0044] In the above-described embodiment, the base material end 13B of the fiber base material 13 is bonded to the back surface 1B of the belt body 12 from the end 12A of the belt body 12 over the step portion 121. However, the present invention is not limited to this. In another embodiment, for example, the length dimension of the fiber base material 13 in the longitudinal direction T may be made smaller than the length dimension D1 of the step surface 121A of the belt body 12, so that the fiber base material 13 fits within the area of ​​the step surface 121A and is bonded to the step surface 121A of the belt body 12. In this case, the fiber base material 13 does not climb onto the back surface 1B of the belt body 12, thereby reducing unevenness on the back surface 1B of the belt body 12. Furthermore, even if a gap occurs between the base material end 13B of the fiber base material 13 and the step portion 121 within the step surface 121A, the gap can be filled with the coating layer 16, and the coating layer 16 prevents the base material end 13B of the fiber base material 13 from being exposed to the outside. In this case as well, the covering layer 16 can prevent the fiber base material 13 from being turned up.

[0045] In the above-described embodiment, the covering layer 16 is provided over the entire width direction W of the conveyor belt 1, but the present invention is not limited to this. In another embodiment, for example, the covering layer 16 may be provided in a dotted line shape along the width direction W of the belt body 12. Furthermore, the covering layer 16 may be provided in a strip shape only in the central region of the belt body 12, excluding the side edges of the belt body 12 in the width direction W.

[0046] In the above-described embodiment, one layer end 161 of the covering layer 16, which is located on the end 12A side of the belt body 12 in the longitudinal direction T, is arranged at a position between the end 12A of the belt body 12 and the step portion 121, but the present invention is not limited to this. For example, one layer end 161 of the covering layer 16 may be arranged in an area of ​​dimension D2 (FIG. 3) of the fiber base material 13 that runs onto the back surface 1B of the belt body 12, which is a non-step surface.

[0047] In the above-described embodiment, the coating layer 16 covering the boundary between the fiber base material 13 and the back surface 1B of the belt body 12 is provided so that the corners of the base material end 13B of the fiber base material 13 are not exposed, but the present invention is not limited to this. Other coating layers may be, for example, thick enough to expose the corners of the base material end 13B of the fiber base material 13, and may cover only the step space between the base material end 13B of the fiber base material 13 and the back surface 1B of the belt body 12. Furthermore, the coating layer may be any type of coating layer formed by hardening a viscous curing agent other than a sealant, as long as it is not a tape-shaped member.

[0048] <Verification test> Next, a description will be given of a verification test using the above-described conveyor belt 1. In this verification test, a conveyor equipment equipped with a drive pulley 2 and driven pulleys 3 and 3A as shown in Fig. 6 was used as the conveyor equipment around which the conveyor belt 1 is wound and rotated. The conveyor belt 1 according to this embodiment was wound in an endless form around the drive pulley 2 and driven pulleys 3 and 3A (hereinafter, simply referred to as pulleys 2, 3 and 3A when no distinction is made between them) of this conveyor equipment, and the drive pulley 2 was driven to evaluate the durability of the conveyor belt 1.

[0049] Also, a conveying belt was prepared as a comparative example, which had the same basic configuration as the conveying belt 1 of the example, except that it did not have the coating layer 16. Similarly, the conveying belt of the comparative example was wound around pulleys 2, 3, and 3A of the conveying equipment in an endless manner, and the driving pulley 2 was driven to evaluate the durability of the conveying belt of the comparative example.

[0050] The conveyor belt 1 used a belt body 12 made by Nitta Corporation called WEU-12ANF-2. The elongation percentage ε of the conveyor belt 1 was 0.5%. A liquid silicone-based sealant that hardens at room temperature (one-component RTV rubber KE-45, manufactured by Shin-Etsu Chemical Co., Ltd.) was used as the sealant for forming the coating layer 16. In this example, the sealant was applied in the longitudinal direction T of the belt body 12 along the width direction W of the belt body so as to straddle the boundary between the surface of the fiber base material 13 and the back surface 1B of the belt body 12, and the sealant was left at room temperature for approximately 12 hours to harden and form the coating layer 16.

[0051] The diameter of the pulleys 3 and 3A was φ20 mm, and the running speed of the conveyor belt 1 was 5.2 m / s. In addition, in the conveyor equipment used in the verification test, the conveyor belt 1 was wound around the pulleys 2, 3, and 3A so that the pulleys 2 and 3 contacted the back surface 1B of the conveyor belt 1 provided with joint portions 11A and 11B, and the pulley 3A contacted the front surface 1A of the conveyor belt 1. In addition, a conveyor belt of a comparative example not provided with a coating layer 16 was also wound around the pulleys 2, 3, and 3A in the same manner as in the example.

[0052] In the comparative example in which the coating layer 16 was not provided, the conveyor belt was 1.5×10 7 When the conveyor belt 1 was bent 1.9×10 times, the fiber base material 13 peeled off from the belt body 12, and the test could not be continued. 7 Although a small peeling occurred when the test piece was bent 5.3 x 10 times, it did not affect the rotational movement and the test could be continued. 7 The peeling did not progress even when the conveyor belt 1 was bent 100 times. From the above, it was confirmed that the load applied to the boundary between the fiber base material 13 and the belt body 12 can be reduced by the coating layer 16, and that damage to the fiber base material 13 provided at the joint portions 11A and 11B can be prevented more effectively than in the past. [Explanation of symbols]

[0053] 1 conveyor belt 11 Connecting part 11A, 11B joints 12 Belt body 12A, 12B end 13 Fiber substrate 14 Ring-shaped joint member 16 Covering layer

Claims

1. A conveying belt in which a plurality of ring-shaped joint members are provided at one end of a belt-shaped belt body in the longitudinal direction and a plurality of ring-shaped joint members are provided at the other end of the belt body in the longitudinal direction, and the plurality of ring-shaped joint members are meshed with each other in the width direction of the belt body, and a connecting pin is inserted into the one and the other of the plurality of ring-shaped joint members, which are aligned with each other in the width direction of the belt body, so that the ends of the belt body are connected to each other, The belt body has a pair of joint portions at one end and the other end, The joint portion is the plurality of ring-shaped joint members made of resin; a belt-shaped fiber base material provided with the plurality of ring-shaped joint members and joined to a surface of the belt body; a coating layer that covers the boundary between the fiber base material and the surface of the belt body in the longitudinal direction of the belt body; A conveyor belt comprising:

2. The surface of the belt body is a step surface having a thickness smaller than the thickness of the belt body at a position where the joint portion is not provided is formed from the end of the belt body to a predetermined position along the longitudinal direction, The fiber substrate is The belt body is joined to the stepped surface, The coating layer is The fiber substrate is coated from the surface of the fiber substrate to the surface of the belt body so as to straddle the boundary between the substrate end portion of the fiber substrate and the surface of the belt body. The conveyor belt according to claim 1 .

3. The fiber substrate is the end of the belt body passes over the step portion of the stepped surface and onto the non-step surface of the belt body, The coating layer is one layer end of the coating layer, which is located on the end side of the belt body in the longitudinal direction, is disposed between the end of the belt body and the step portion, the other layer end of the coating layer, which is located farther from the end of the belt body in the longitudinal direction than one layer end of the coating layer, is located farther from the end of the belt body than the base material end of the fiber base material that has risen onto the surface of the belt body; The conveyor belt according to claim 2.

4. The surface of the coating layer is provided with an inclined surface that is inclined toward the surface of the belt body along the longitudinal direction of the belt body. The conveyor belt according to claim 1 .

5. The coating layer is a layer in which a sealant is cured. The conveyor belt according to any one of claims 1 to 4.

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