Conveyor belt

Abstract

To provide a conveyor belt capable of suppressing belt warpage caused when connecting fittings are attached to an end of the belt.SOLUTION: There is provided a baler belt 1 that comprises a belt body 2 having ends, in which a first cover layer 201, a second cover layer 207, and a core canvas layer (a first core canvas layer 202, a second core canvas layer 204, and a third core canvas layer 206) are laminated, and a one end-side coupling member 3 and an other end-side coupling member 4 which are attached to both ends of the belt body 2 and have pluralities of U-shaped hooks 31 and hooks 41 coupled together across the belt body 2 along the belt width. The baler belt 1 is made endless by inserting a pin 6 into a hole 5 formed along the belt width for coupling when the hook 31 of the one end-side coupling member 3 and the hook 41 of the other end-side coupling member 4 are fitted together, wherein the one end-side coupling member 3 and the other end-side coupling member 4 are coupled together along the belt width only on the side of the second cover layer 207, and the second cover layer 207 is larger in thickness than the first cover layer 201.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an endless conveyor belt formed by joining belts each having ends. [Background technology]

[0002] Conveyor belts made of laminated rubber and canvas cores are generally known. As shown in Patent Document 1, for example, conveyor belts are used not only as belt conveyors for literally transporting materials, but also as baler belts for compressing crops while rotating them in balers such as round balers and roll balers that pack crops such as hay and straw into cylindrical shapes.

[0003] These conveyor belts are generally manufactured in a belt shape with ends or in a strip shape, and then both longitudinal ends of the belt are connected to form an endless or circular shape for use. A commonly used method for connecting both ends of a conveyor belt is to attach connecting metal fittings to both ends of the belt, as disclosed in Patent Documents 2 and 3, and then insert pins into holes formed by fitting these connecting metal fittings together to connect the ends.

[0004] Patent Document 2 discloses a connecting fitting in which a plurality of hooks that form a U-shape when the opening is pressed are arranged in parallel, and the hooks are connected near one end with the wire of member 23 in Fig. 1. Also, Patent Document 3 discloses a connecting fitting in Fig. 1 in which a long branch with a claw at its end protrudes from one side of a continuous bar, and a short branch with a claw at its end protrudes from the other side of the continuous bar. In this way, the connecting fittings that connect both ends of a conveyor belt are connected at the portions that abut against the back side or front side of the conveyor belt, while the portions that abut against the front side or back side of the conveyor belt are not connected, resulting in a structure in which the hooks are arranged in parallel at a predetermined interval.

[0005] In this way, by using a connecting fitting having a structure in which at least a portion of the hooks are connected and the hooks are arranged in parallel at a predetermined interval, it becomes easy to align the positions of the hooks in the length direction of the conveyor belt, i.e., the positions where the hooks bite into the belt. By aligning the hook positions, it is possible to prevent loads from concentrating on specific hooks, thereby improving the lifespan of the belt. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] US Patent Application Publication No. 2024 / 0023488 [Patent Document 2] U.S. Patent No. 5,553,359 [Patent Document 3] Patent No. 5492086 Summary of the Invention [Problem to be solved by the invention]

[0007] However, when using a connecting fitting in which one side of the hook, i.e., the end portion rather than the center portion, is connected as shown in Figure 1 of Patent Documents 2 and 3, the belt may be prone to warping with the side to which the connecting fitting is connected facing inward. When a belt warps, not only does it become difficult to connect the belts, but the belt and connecting fitting may also be more susceptible to damage due to uneven wear and stress concentration.

[0008] Therefore, an object of the present invention is to provide a conveyor belt that can suppress the occurrence of belt warping when connecting fittings are attached to the ends of the belt. [Means for solving the problem]

[0009] The present invention includes a first cover layer that forms an outer circumferential surface, a second cover layer that forms an inner circumferential surface; A belt having at least one end laminated therein, and a core canvas layer laminated between the first cover layer and the second cover layer and including a canvas material; and a pair of connecting members attached to both ends of the belt in the longitudinal direction, each of which has a plurality of U-shaped hooks arranged in parallel at predetermined intervals along the belt width direction so as to sandwich the belt, and which are connected to each other, a pair of connecting members, the plurality of U-shaped hooks of which are fitted to the plurality of U-shaped hooks of the other of which are connected by inserting pins into holes formed in the belt width direction, and the conveyor belt is made endless; the plurality of U-shaped hooks of the pair of connecting members are joined along the belt width direction only on one side of either the first cover layer or the second cover layer, The thickness of one of the first cover layer and the second cover layer on the side where the multiple U-shaped hooks of the pair of connecting members are joined along the belt width direction is greater than the thickness of the other of the first cover layer and the second cover layer.

[0010] According to the above configuration, the U-shaped hooks of the pair of connecting members that connect the endless belts are joined along the belt width direction only on the first cover layer side or the second cover layer side. That is, the joined portions of the U-shaped hooks of the pair of connecting members face only one of the first cover layer or the second cover layer. In this way, if the U-shaped hooks of the pair of connecting members that connect the endless belts are joined along the belt width direction only on one of the first cover layer or the second cover layer side, for example, only on the second cover layer side, the conveyor belt may warp along the belt width direction with the second cover layer side facing inward. Therefore, warping of the conveyor belt can be suppressed by making one of the first and second cover layers on the side where the multiple U-shaped hooks of the connecting members are joined along the belt width direction, for example, by making the thickness of the second cover layer greater than the thickness of the first cover layer. Note that the one of the first and second cover layers on the side where the multiple U-shaped hooks of the connecting members are joined along the belt width direction refers to one of the first and second cover layers that faces the joined portions of the multiple U-shaped hooks of the pair of connecting members.

[0011] In the conveyor belt of the present invention, the ratio of the thickness of one of the first cover layer and the second cover layer to the total thickness of the conveyor belt may be 0.35 or more.

[0012] According to the above configuration, by satisfying the above condition regarding the thickness of one of the first cover layer and the second cover layer on the side where the multiple U-shaped hooks of the connecting member are joined along the belt width direction, warping of the conveyor belt can be further suppressed.

[0013] Further, the present invention provides the above-mentioned conveyor belt, the first cover layer and the second cover layer are formed of a rubber composition, One of the first cover layer and the second cover layer on the side where the plurality of U-shaped hooks of the pair of connecting members are joined along the belt width direction may have a Type A hardness measured with a Type A durometer of A80 to A90.

[0014] If the hardness of one of the first cover layer and the second cover layer, which is on the side where the multiple U-shaped hooks of the pair of connecting members are joined in the belt width direction, is less than A80, the effect of suppressing warping of the conveyor belt is not sufficient, and if the hardness is higher than A90, there is a risk that the flexibility of the conveyor belt will decrease. Therefore, by satisfying the above conditions, it is possible to suppress warping of the conveyor belt while maintaining the flexibility of the conveyor belt.

[0015] Further, the present invention provides the above-mentioned conveyor belt, The hardness of one of the first cover layer and the second cover layer on the side where the plurality of U-shaped hooks of the pair of connecting members are joined along the belt width direction may be higher than the hardness of the other of the first cover layer and the second cover layer.

[0016] The hardness of one of the first cover layer and the second cover layer, which is on the inner side of the warp in the belt width direction of the conveyor belt, is made higher than the hardness of the other of the first cover layer and the second cover layer, which is on the outer side of the warp in the belt width direction of the conveyor belt, thereby making it possible to suppress the warp of the conveyor belt while improving the flexibility of the conveyor belt.

[0017] The present invention also provides a golf club head comprising: a first cover layer that forms an outer circumferential surface; A second cover layer that forms the inner circumferential surface; At least two core canvas layers laminated between the first cover layer and the second cover layer and including a canvas material; At least one intermediate layer is laminated between the core canvas layers, and the belt has an end. and a pair of connecting members attached to both ends of the belt in the longitudinal direction, each of which has a plurality of U-shaped hooks arranged in parallel at predetermined intervals along the belt width direction so as to sandwich the belt, and which are connected to each other, a pair of connecting members, the plurality of U-shaped hooks of which are fitted to the plurality of U-shaped hooks of the other of which are connected by inserting pins into holes formed in the belt width direction, and the conveyor belt is made endless; the plurality of U-shaped hooks of the pair of connecting members are joined along the belt width direction only on one side of either the first cover layer or the second cover layer, The ratio of the total thickness of the intermediate layer to the total thickness of the conveyor belt is 0.2 or more.

[0018] According to the above configuration, if the connecting member that connects the belts with ends to form an endless belt is, for example, joined along the belt width direction only on the second cover layer side, the conveyor belt may warp with the second cover layer side facing inward. Therefore, in a conveyor belt, at least two core canvas layers containing canvas material are laminated between a first cover layer and a second cover layer, and at least one intermediate layer is laminated between the core canvas layers, and by the intermediate layer satisfying the above conditions, warping of the conveyor belt can be suppressed.

[0019] The present invention also provides a golf club head comprising: a first cover layer that forms an outer circumferential surface; a second cover layer that forms an inner circumferential surface; A belt having at least one end laminated therein, and a core canvas layer laminated between the first cover layer and the second cover layer and including a canvas material; and a pair of connecting members attached to both ends of the belt in the longitudinal direction, each of which has a plurality of U-shaped hooks arranged in parallel at predetermined intervals along the belt width direction so as to sandwich the belt, and which are connected to each other, a pair of connecting members, the plurality of U-shaped hooks of which are fitted to the plurality of U-shaped hooks of the other of which are connected by inserting pins into holes formed in the belt width direction, and the conveyor belt is made endless; The core canvas layer includes a woven fabric woven by crossing warp yarns arranged in a direction parallel to the belt length direction and weft yarns arranged in a direction parallel to the belt width direction, The weft yarn is characterized by including a monofilament yarn.

[0020] According to the above configuration, in the core canvas layer laminated on the conveyor belt, the weft yarns arranged parallel to the belt width direction contain monofilament yarns, thereby suppressing warping of the conveyor belt along the belt width direction.

[0021] Further, the present invention provides the above-mentioned conveyor belt, The core canvas layer may be characterized by including a multi-layered woven fabric in which the weft yarns are arranged in at least two layers and the weft yarns and the warp yarns of each layer are woven by crossing each other.

[0022] According to the above configuration, the strength required for the core canvas layer of the conveyor belt can be ensured while improving flexibility.

[0023] The present invention may also be characterized in that the conveyor belt is used in a roll baler that rolls grass into a cylindrical shape and packs it.

[0024] According to the above configuration, when rolling the grass into a cylindrical shape and packing it, uneven packing such as disturbance of the grass due to warping of the conveyor belt can be suppressed. [Effects of the Invention]

[0025] It is possible to provide a conveyor belt that can suppress the occurrence of belt warping when connecting fittings are attached to the ends of the belt. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 2 is a top view of a baler belt. [Figure 2] 1A is a cross-sectional view in the belt thickness direction of the belt body of a baler belt according to embodiment 1. FIG. 1B is a cross-sectional view in the belt thickness direction of the belt body of a baler belt according to embodiment 2. [Figure 3] 4 is an explanatory view of a one-end connecting member according to the first and second embodiments. FIG. [Figure 4] 3 is a cross-sectional view of a one-end connecting member according to the first and second embodiments in the belt length direction. FIG. [Figure 5] FIG. 2 is an explanatory diagram of warpage occurring in the belt width direction of a baler belt. [Figure 6] 1 is a cross-sectional view of a belt body of a baler belt according to an embodiment in a belt thickness direction. [Figure 7]1 is a photograph showing the appearance of a baler belt according to an example, showing warpage. [Figure 8] FIG. 2 is an explanatory diagram of a method for producing a baler belt according to an embodiment. [Figure 9] 10A and 10B are explanatory views of a one-end connecting member according to another embodiment. [Figure 10] FIG. 10 is a cross-sectional view of a belt body of a baler belt according to a third embodiment in the belt thickness direction. DETAILED DESCRIPTION OF THE INVENTION

[0027] (Embodiment 1) Hereinafter, an embodiment of a conveyor belt of the present invention will be described with reference to the drawings, taking as an example a baler belt 1 used in a baler.

[0028] (Baler) Balers such as round balers and roll balers in which the baler belt 1 of this embodiment is used are agricultural machines that roll crops such as grass, hay, and straw into a roll, i.e., a cylindrical shape, and compress and package them. The baler belt 1 is incorporated into the baler as a component for rotating and compressing the picked-up crops.

[0029] (Baler Belt 1) As shown in FIG. 1, the baler belt 1 according to this embodiment comprises a long, strip-shaped belt body 2 equivalent to a belt having ends, and a pair of connecting members, a one-end connecting member 3 and an other-end connecting member 4, attached to both ends 21 and 22 of the belt body 2 in the longitudinal direction, respectively. The one-end connecting member 3 and the other-end connecting member 4 are connected to form an endless flat belt, and the belt is used by being wound around multiple pulleys provided in a baler.

[0030] (Belt body 2) As shown in Figure 2(A), the belt body 2 is configured by laminating, in order from the outer peripheral surface side to the inner peripheral surface side of the belt body 2, a first cover layer 201, a first core canvas layer 202, a first intermediate layer 203, a second core canvas layer 204, a second intermediate layer 205, a third core canvas layer 206, and a second cover layer 207 in the belt thickness direction.

[0031] (First cover layer 201, first intermediate layer 203, second intermediate layer 205, second cover layer 207) The first cover layer 201 may be formed of a rubber composition such as a vulcanized or crosslinked rubber composition that is conventionally used as a cover layer that forms the outer peripheral surface of the baler belt 1 . The rubber component in the cross-linked rubber composition forming the first cover layer 201 can be selected from known vulcanizable or cross-linkable rubbers and / or elastomers, such as diene rubber, natural rubber, isoprene rubber, butadiene rubber, chloroprene rubber (CR), styrene butadiene rubber (SBR), vinylpyridine-styrene-butadiene copolymer rubber, acrylonitrile butadiene rubber (nitrile rubber), hydrogenated products of the diene rubbers such as hydrogenated nitrile rubber containing a mixed polymer of hydrogenated nitrile rubber and an unsaturated carboxylic acid metal salt, olefin rubber such as ethylene-α-olefin rubber (ethylene-α-olefin elastomer), polyoctenylene rubber, ethylene-vinyl acetate copolymer rubber, chlorosulfonated polyethylene rubber, alkylated chlorosulfonated polyethylene rubber, epichlorohydrin rubber, acrylic rubber, silicone rubber, urethane rubber, and fluororubber. These rubber components can be used alone or in combination. Of these, it is preferable to contain at least natural rubber from the viewpoint of superior economy, and it is preferable to contain natural rubber and styrene-butadiene rubber from the viewpoint of achieving both durability and economy.

[0032] In addition to the rubber component, the rubber composition may contain conventional additives, such as fillers such as carbon black, silica, and calcium carbonate, short fibers, crosslinking agents or vulcanizing agents such as sulfur and organic peroxides, co-crosslinking agents, crosslinking aids, or vulcanization aids, crosslinking accelerators or vulcanization accelerators, metal oxides such as zinc oxide, plasticizers such as softeners or oils such as paraffinic oils and naphthenic oils, processing agents or processing aids such as fatty acids such as stearic acid, waxes, and paraffins, and antiaging agents such as antioxidants, heat antioxidants, flex crack inhibitors, and antiozonants.

[0033] The second cover layer 207 is a cover layer that forms the inner peripheral surface of the baler belt 1, and may be formed from the same vulcanized or crosslinked rubber composition and additives as the first cover layer 201. The first intermediate layer 203 and the second intermediate layer 205 may also be formed from the same vulcanized or crosslinked rubber composition and additives as the first cover layer 201 .

[0034] (First core canvas layer 202, second core canvas layer 204, third core canvas layer 206) The first core canvas layer 202, the second core canvas layer 204, and the third core canvas layer 206 are woven fabrics such as plain weave, twill weave, or satin weave, woven by crossing warp and weft threads. For example, a single-layer plain weave fabric can be used, woven by crossing warp and weft threads at approximately right angles. Materials for the warp and weft threads include polyester fibers such as PET fiber and PEN fiber, polyamide fibers such as nylon 66 fiber, nylon 6 fiber, and aramid fiber, and cotton fiber. The warp and weft threads may also be multifilament yarns made by twisting together multiple long filaments, monofilament yarns made from a single filament, or spun yarns or spun yarns made by twisting together short staple fibers. The fineness of the warp and weft threads is 500 to 8000 dtex, particularly 1000 to 6000 dtex, for filament yarns, and 1 to 20, particularly 1.5 to 10, for spun yarns. The warp density is 50 to 100 threads / 5cm, and the weft density is 20 to 50 threads / 5cm. The thickness of the first core canvas layer 202, the second core canvas layer 204, and the third core canvas layer 206 is, for example, 0.3 to 2.0 mm, and preferably 0.5 to 1.2 mm.

[0035] The first core canvas layer 202, the second core canvas layer 204, and the third core canvas layer 206 may be embedded in the baler belt 1 in any direction, but in order to improve the straightness of the baler belt 1, it is preferable that the warp or weft threads be embedded in a direction that is approximately parallel to the length of the belt, and in order to improve the durability of the baler belt 1, it is even more preferable that the warp threads be embedded in a direction that is approximately parallel to the length of the belt and the weft threads be embedded in a direction that is approximately parallel to the width of the belt.

[0036] The first core canvas layer 202, the second core canvas layer 204, and the third core canvas layer 206 may be subjected to a conventional adhesive treatment or surface treatment to improve adhesion to the first cover layer 201, the first intermediate layer 203, the second intermediate layer 205, the second cover layer 207, etc. Examples of adhesive components or surface treatment agents used for adhesive treatment include isocyanates, polyisocyanate compounds, epoxy resins, epoxy compounds, silane coupling agents, amino resins, rubber components such as rubber latex or rubber cement, and RFL liquids containing resorcinol (R), formaldehyde (F), and rubber or latex (L), such as RFL liquids containing a rubber component such as vinylpyridine-styrene-butadiene copolymer rubber formed from RF condensates of resorcinol (R) and formaldehyde (F). These may be used alone or in combination, and multiple treatments may be performed sequentially using the same or different adhesive components. Of these adhesive components, a rubber component, an RFL liquid, or a combination thereof is preferred. The rubber component is preferably the same type as the rubber component of the cover layer, and preferably an adhesive component containing the same rubber component.

[0037] The adhesive treatment using the rubber component may be, for example, a treatment of soaking the first core canvas layer 202, the second core canvas layer 204, and the third core canvas layer 206 in a rubber paste prepared by dissolving a rubber composition containing the rubber component in a solvent, a treatment of rubbing the solid rubber composition into fabric, or a treatment of coating the rubber composition rolled into a sheet, i.e., laminating the layers. The adhesive treatment may be performed on at least one surface of the first core canvas layer 202, the second core canvas layer 204, and the third core canvas layer 206, but it is preferable to treat both surfaces of the first core canvas layer 202, the second core canvas layer 204, and the third core canvas layer 206.

[0038] (One end connecting member 3, other end connecting member 4) As shown in Figures 3 and 4, the one-end connecting member 3 is made of multiple U-shaped metal hooks 31 that are arranged in parallel at predetermined intervals along the belt width direction so as to form a ⊂ shape when viewed from the side of the belt main body 2, and the multiple U-shaped hooks 31 are connected by joining one end 311 of each hook 31 to a single wire 32 by welding or the like. The one-end connecting member 3 is attached to one end 21 of the belt main body 2 by driving the rivet 33 attached to the end 311 from the end 311 side to the end 312 side, with one end 311 of each hook 31 abutting the inner circumferential surface of the second cover layer 207 of one end 21 of the belt main body 2 and the other end 312 of each hook 31 abutting the outer circumferential surface of the first cover layer 201 of one end 21 of the belt main body 2, with each hook 31 sandwiching one end 21 of the belt main body 2 in the thickness direction. One end 311, which is the connecting portion of the multiple U-shaped hooks 31 connected by the wire 32, is positioned in a position facing only the second cover layer 207. In other words, the one-end connecting member 3 is attached to one end 21 of the belt main body 2 by connecting the multiple U-shaped hooks 31 by the wire 32 only at one end 311 on the second cover layer 207 side along the belt width direction.

[0039] The other-end connecting member 4 has a configuration similar to that of the one-end connecting member 3. The other-end connecting member 4 is attached to the other end 22 of the belt main body 2 in parallel at a predetermined interval along the belt width direction so that the multiple U-shaped hooks 41 of the other-end connecting member 4 are alternately arranged in the belt width direction relative to the multiple U-shaped hooks 31 of the one-end connecting member 3. More specifically, similar to the one-end connecting member 3, one end, which is the connecting portion of the multiple U-shaped hooks 41 connected by a wire, is positioned in a position facing only the second cover layer 207. In other words, the multiple U-shaped hooks 41 of the other-end connecting member 4 are connected by a wire only at one end on the second cover layer 207 side along the belt width direction and are attached to the other end 22 of the belt main body 2.

[0040] As shown in Fig. 1, the one-end connecting member 3 and the other-end connecting member 4 are fitted together in a staggered manner such that the hooks 31 of the one-end connecting member 3 and the hooks 41 of the other-end connecting member 4 mesh with each other. As shown in Fig. 4, the one-end connecting member 3 and the other-end connecting member 4 are fitted together with each other, so that a pin 6 is inserted into a hole 5 formed so as to pass through the inside of each hook 31 and each hook 41 in the belt width direction. In this way, the one-end connecting member 3 and the other-end connecting member 4 are connected to form the baler belt 1 into an endless flat belt.

[0041] (Attachment and connection of one-end connecting member 3 and other-end connecting member 4 to belt body 2) A clamping part for clamping the one-end side connecting member 3 is provided between the clamping metal jaws of the vice, and a jig having a plurality of through holes for assisting the work of driving each rivet 33 is set in the clamping part. The rivets 33 attached to the ends 311 of the hooks 31 of the one-end connecting member 3 are inserted into the multiple holes in the clamping parts of the set jig, and the V-shaped opening hooks 31 of the one-end connecting member 3 are clamped between the clamping parts of the jig. One end 21 of the belt body 2 is sandwiched between the V-shaped hooks 31 of the one-end connecting member 3, and the metal jaws of a vice are tightened. Then, each of the rivets 33 inserted into the plurality of holes in the clamping portion is driven from the end 311 side to the end 312 side of each of the hooks 31 with a hammer. Then, the metal jaws of the vice are loosened, and the belt body 2 is taken out with the one end side connecting member 3 attached to one end 21 thereof, and the tips of the driven rivets 33 are struck with a hammer to straighten the tips of the rivets 33. As a result, the one-end connecting member 3 is attached to one end 21 of the belt body 2.

[0042] Similarly, the other end connecting member 4 is attached to the other end 22 of the belt body 2 . The other end connecting member 4 is attached to the other end 22 of the belt body 2 so that the hooks 41 of the other end connecting member 4 are alternately positioned in the belt width direction relative to the hooks 31 of the one end connecting member 3.

[0043] Next, as shown in Figure 1, one end side connecting member 3 of the pair of connecting members and the other end side connecting member 4 of the pair of connecting members are fitted together in such a manner that each of the multiple U-shaped hooks 31 of the one end side connecting member 3 and each of the multiple U-shaped hooks 41 of the other end side connecting member 4 are interlocked with each other. Next, as shown in FIG. 4, when each hook 31 and each hook 41 are fitted together, a pin 6 is inserted into a hole 5 formed so as to pass through the inside of each hook 31 and each hook 41 in the belt width direction. As a result, the one end connecting member 3 and the other end connecting member 4 are connected together, and an endless baler belt 1 is produced.

[0044] (Relationship between the one-end connecting member 3, the other-end connecting member 4 and each layer of the belt body 2) In the baler belt 1 of this embodiment, only one end 311 of each hook 31 of the one-end connecting member 3 is connected in parallel at a predetermined interval along the belt width direction by the wire 32, and one end 311 of each hook 31 abuts against the inner circumferential surface of the second cover layer 207 of one end 21 of the belt main body 2. In other words, each hook 31 of the one-end connecting member 3 according to this embodiment is connected along the belt width direction only on the second cover layer 207 side of the belt main body 2. Similarly, in the other-end connecting member 4, only one end 411 of each hook 41 is connected in parallel at a predetermined interval along the belt width direction by a wire 42, and one end 411 of each hook 41 abuts against the inner circumferential surface of the second cover layer 207 of the other end 22 of the belt main body 2. In other words, each hook 41 of the other-end connecting member 4 according to this embodiment is also configured to be connected along the belt width direction only on the second cover layer 207 side of the belt main body 2.

[0045] As described above, when the hooks 31 of the one-end connecting member 3 and the hooks 41 of the other-end connecting member 4 are joined along the belt width direction only on the second cover layer 207 side of the belt body 2, the baler belt 1 may warp in the belt width direction with the second cover layer 207 facing inward, as shown in FIG. 5.

[0046] 2(A), the belt body 2 of this embodiment is configured so that the thickness of the second cover layer 207, which is on the side where the hooks 31 of the one-end connecting member 3 and the hooks 41 of the other-end connecting member 4 are joined along the belt width direction, is greater than the thickness of the first cover layer 201. In other words, in the belt body 2, the first core canvas layer 202, the second core canvas layer 204, and the third core canvas layer 206 are layered biasedly toward the outer peripheral surface side, i.e., toward the first cover layer 201 side. This makes it possible to suppress warping of the baler belt 1 in which the one end side connecting member 3 and the other end side connecting member 4 are connected.

[0047] In particular, it is preferable that the ratio of the thickness of the second cover layer 207, which is the side to which the hooks 31 of the one-end connecting member 3 and the hooks 41 of the other-end connecting member 4 are joined along the belt width direction, to the thickness of the first cover layer 201 is 1.2 or more. By satisfying this condition, warping of the baler belt 1 can be further suppressed.

[0048] Furthermore, it is preferable that the ratio of the thickness of the second cover layer 207 to the thickness in the belt thickness direction of the belt body 2 of the baler belt 1, i.e., the total thickness, is 0.35 or more. By satisfying this condition, warping of the baler belt 1 can be further suppressed.

[0049] Furthermore, the rubber hardness of the second cover layer 207, which is the side to which the hooks 31 of the one-end connecting member 3 and the hooks 41 of the other-end connecting member 4 are joined along the belt width direction, is preferably A80 to A90. Here, rubber hardness refers to a value measured using a Type A durometer in accordance with the spring durometer hardness test specified in JIS K 6253 (2012) (Vulcanized rubber and thermoplastic rubber - Determination of hardness), and is sometimes simply referred to as hardness or rubber hardness. Methods for changing rubber hardness include changing the type and amount of rubber components and additives, and changing the crosslinking temperature and crosslinking time. If the hardness of the second cover layer 207 is less than A80, the effect of suppressing warpage of the baler belt 1 cannot be sufficiently obtained, and if it is higher than A90, there is a risk of reducing the flexibility of the baler belt 1. Therefore, by satisfying the above conditions, it is possible to suppress warpage of the baler belt 1 while maintaining the flexibility of the baler belt 1.

[0050] The rubber hardness of both the first cover layer 201 and the second cover layer 207 may be set to A80 to A90. In this case, although the effect of suppressing the warping of the baler belt 1 is enhanced, there is a risk that the flexibility of the baler belt 1 may be reduced. Therefore, as described above, it is preferable that at least second cover layer 207, which is the inner peripheral surface of the warp, of first cover layer 201 and second cover layer 207 has a rubber hardness of A80 to A90.

[0051] Furthermore, it is more preferable that the hardness of the second cover layer 207, which is the side to which the hooks 31 of the one-end connecting member 3 and the hooks 41 of the other-end connecting member 4 are joined along the belt width direction, be higher than the hardness of the first cover layer 201, which is the side to which the hooks 31 of the one-end connecting member 3 and the hooks 41 of the other-end connecting member 4 are not joined along the belt width direction. That is, by making the hardness of the second cover layer 207, which is on the inner side of the warp of the baler belt 1 along the belt width direction, higher than the hardness of the first cover layer 201, which is on the outer side of the warp of the baler belt 1 along the belt width direction, it is possible to suppress warp of the baler belt 1. This makes it possible to suppress warp of the baler belt 1 while improving the flexibility of the baler belt 1.

[0052] In this embodiment, the case where the present invention is applied to a baler belt 1 has been described. In particular, the baler belt 1 must have a high level of smoothness due to its function of pressing crops such as grass, hay, and straw. If the baler belt 1 warps beyond the allowable range, it may wear out in parts or be unable to press the crops evenly, which could lead to problems such as uneven packing, such as messy grass, or deformation of the roll. According to the above configuration, when rolling and packing grass or the like into a cylindrical shape, uneven packing such as disturbance of the grass due to warping of the baler belt 1 can be suppressed.

[0053] (Embodiment 2) As shown in FIG. 2(B), the baler belt 1 of embodiment 2 is configured so that the ratio of the total thickness of the intermediate layers, which is the sum of the thickness of the first intermediate layer 203 and the thickness of the second intermediate layer 205, to the thickness of the belt body 2 of the baler belt 1 in the belt thickness direction perpendicular to the belt width direction and belt length direction (total thickness of the baler belt 1) is 0.2 or more. In this case, the thickness of the second cover layer 207 on the side where the one end side connecting member 3 and the other end side connecting member 4 are joined along the belt width direction may be the same as the thickness of the first cover layer 201.

[0054] The belt body 2 of the bailer belt 1 of embodiment 2 is configured by stacking two intermediate layers: a first intermediate layer 203 stacked between the first core canvas layer 202 and the second core canvas layer 204, and a second intermediate layer 205 stacked between the second core canvas layer 204 and the third core canvas layer 206. However, this is not limited to this, and the belt body 2 may be formed by stacking at least two core canvas layers containing canvas material, laminated between the first cover layer 201 and the second cover layer 207, and at least one intermediate layer laminated between the core canvas layers, and the intermediate layer may be one layer, i.e., the core canvas layer may be two layers, or three layers, i.e., the core canvas layer may be four or more layers.

[0055] As described above, by having the intermediate layer laminated between the core canvas layers satisfy the above conditions, warping of the conveyor belt can be suppressed.

[0056] Furthermore, in the belt body 2, it is preferable that the ratio of the total thickness of the intermediate layers, that is, the thickness of the first intermediate layer 203 + the thickness of the second intermediate layer 205, to the total thickness of the core canvas layers, that is, the thickness of the first core canvas layer 202 + the thickness of the second core canvas layer 204 + the thickness of the third core canvas layer 206, is 0.5 or more. By having the intermediate layer satisfy the above conditions, warping of the baler belt 1 can be further suppressed.

[0057] Furthermore, in the belt body 2, it is preferable that the ratio of the total thickness of the intermediate layers (the sum of the thickness of the first intermediate layer 203 and the thickness of the second intermediate layer 205) to the total thickness of the cover layers (the sum of the thickness of the first cover layer 201 and the thickness of the second cover layer 207) be 0.5 or more. When the intermediate layer satisfies the above condition, warping of the conveyor belt can be further suppressed.

[0058] (Embodiment 3) 10, the belt body 312 of the baler belt 300 of the third embodiment is configured such that a first cover layer 301, a core canvas layer 302, and a second cover layer 307 are laminated in the belt thickness direction in this order from the outer peripheral surface side to the inner peripheral surface side of the belt body 312. The configuration other than the belt body 312 is the same as that of the first embodiment. In this embodiment, the thickness of the second cover layer 307 on the side where the one end side connecting member 3 and the other end side connecting member 4 are joined along the belt width direction may be the same as the thickness of the first cover layer 301.

[0059] As shown in FIG. 10, the core canvas layer 302 is a double-woven canvas woven by crossing warp threads 320 and two layers of weft threads 330.

[0060] Specifically, the weft yarns 330 have upper layer weft yarns 3301 arranged on the outer circumferential surface side and lower layer weft yarns 3302 arranged on the inner circumferential surface side. The upper layer weft yarns 3301 are formed by a set of one monofilament yarn 3301A and four multifilament yarns 3301B, and the monofilament yarns 3301A and the multifilament yarns 3301B are arranged parallel to the belt width direction. Similarly, the lower layer weft yarns 3302 are formed by a set of one monofilament yarn 3302A and four multifilament yarns 3302B, and the monofilament yarns 3302A and the multifilament yarns 3302B are arranged parallel to the belt width direction. In this embodiment, for example, the monofilament yarns 3301A and 3302A are PET monofilament yarns with a fineness of 11,000 dtex and a diameter of 1.0 mm. In addition, multifilament yarns 3301B and 3302B use nylon 66 multifilament yarn with a fineness of 6930 dtex.

[0061] The warp threads 320 are arranged such that the first warp thread 3201, the second warp thread 3202, the third warp thread 3203, the fourth warp thread 3204, the fifth warp thread 3205, and the sixth warp thread 3206 are parallel to the belt length direction. The first warp yarn 3201 is entangled only with the monofilament yarn 3301A and the multifilament yarn 3301B related to the upper layer weft yarn 3301 in the belt length direction. The second warp yarn 3202 is intertwined with only the monofilament yarn 3302A and the multifilament yarn 3302B related to the lower layer weft yarn 3302 in the belt length direction. The third warp threads 3203 and fourth warp threads 3204 are arranged between the upper layer weft threads 3301 and the lower layer weft threads 3302, and are arranged linearly in the belt length direction without being entangled with the monofilament yarns 3301A and multifilament yarns 3301B of the upper layer weft threads 3301, and the monofilament yarns 3302A and multifilament yarns 3302B of the lower layer weft threads 3302. The third warp threads 3203 are arranged closer to the outer periphery than the fourth warp threads 3204. In this embodiment, for example, the first warp thread 3201, the second warp thread 3202, the third warp thread 3203, and the fourth warp thread 3204 are made of PET multifilament yarn with a fineness of 6600 dtex. The fifth warp thread 3205 and the sixth warp thread 3206 are intertwined with the monofilament yarn 3301A and the multifilament yarn 3301B associated with the upper layer weft thread 3301, and the monofilament yarn 3302A and the multifilament yarn 3302B associated with the lower layer weft thread 3302, so as to connect the upper layer weft thread 3301 and the lower layer weft thread 3302. In this embodiment, for example, the fifth warp threads 3205 and the sixth warp threads 3206 are made of nylon 66 multifilament yarns with a fineness of 2770 dtex.

[0062] Furthermore, as in embodiment 1, the core canvas layer 302 may be subjected to a conventional adhesive treatment or surface treatment to improve adhesion to the first cover layer 301 and the second cover layer 307. As in embodiment 1, one or both sides of the core canvas layer 302 may be subjected to an adhesive treatment such as coating with a rubber composition rolled into a sheet.

[0063] The core canvas layer 302 uses monofilament yarns 3301A and 3302A, which are thicker than the multifilament yarns 3301B and 3302B, for the weft yarns 330. As a result, in the core canvas layer 302, the weft yarns 330, which are arranged in a direction parallel to the belt width direction, contain monofilament yarns, which makes it possible to suppress warping of the baler belt 300 along the belt width direction. Furthermore, the core canvas layer 302 is a double-weave canvas woven by crossing warp yarns 320 consisting of first warp yarns 3201, second warp yarns 3202, third warp yarns 3203, fourth warp yarns 3204, fifth warp yarns 3205, and sixth warp yarns 3206 with weft yarns 330 of a double-weave weft consisting of two layers of upper layer weft yarns 3301 and lower layer weft yarns 3302. The core canvas layer 302 may also be a multi-weave canvas with three or more layers of weft yarns 330. This improves flexibility while ensuring the strength required for the core canvas layer 302 of the baler belt 300. Furthermore, when using a double-weave core canvas layer 302 for manufacturing the belt body 312, the number of steps can be reduced compared to stacking multiple canvas layers.

[0064] (Other embodiments) (1) In the above embodiment 1, the hooks 31 of the one-end connecting member 3 and the hooks 41 of the other-end connecting member 4 are connected along the belt width direction only on the second cover layer 207 side of the belt main body 2. The present invention can also be applied to a case where each hook 31 of the one-end connecting member 3 and each hook 41 of the other-end connecting member 4 are connected along the belt width direction only on the first cover layer 201 side of the belt main body 2. Specifically, in the one-end connecting member 3, only the other end 312 of each hook 31 is connected along the belt width direction by the wire 32, and the other end 312 of each hook 31 abuts against the outer peripheral surface of the baler belt 1, which is the first cover layer 201 at one end 21 of the belt body 2. Similarly, in the other-end connecting member 4, only the other end 412 of each hook 41 is connected along the belt width direction by the wire 42, and the other end 412 of each hook 41 abuts against the outer peripheral surface of the baler belt 1, which is the first cover layer 201 at the other end 22 of the belt body 2. In this case, the thickness of the first cover layer 201 on the side where the one-end connecting member 3 and the other-end connecting member 4 are connected along the belt width direction is configured to be greater than the thickness of the second cover layer 207. This makes it possible to suppress warping of the baler belt 1, in which the one end connecting member 3 and the other end connecting member 4 are connected, with the first cover layer 201 side facing inward.

[0065] In this case, it is particularly preferable that the ratio of the thickness of the first cover layer 201 on the side where each hook 31 of the one-end side connecting member 3 and each hook 41 of the other-end side connecting member 4 are joined along the belt width direction to the thickness of the second cover layer 207 is 1.2 or more. Furthermore, it is preferable that the ratio of the thickness of the first cover layer 201 to the thickness of the belt body 2 of the baler belt 1 in the belt thickness direction, ie, the total thickness, is 0.35 or more.

[0066] (2) In the above-mentioned embodiment 1, as shown in Figure 2 (A), the belt body 2 is configured by stacking in the belt thickness direction, in order from the outer surface side to the inner surface side of the belt body 2, a first cover layer 201, a first core canvas layer 202, a first intermediate layer 203, a second core canvas layer 204, a second intermediate layer 205, a third core canvas layer 206, and a second cover layer 207. However, this is not limited to this, and the belt body 2 is layered with a first cover layer 201 that forms the outer surface of the belt body 2, a second cover layer 207 that forms the inner surface, and multiple core canvas layers containing canvas material may be layered between the first cover layer 201 and the second cover layer 207, as long as at least one core canvas layer containing canvas material is layered.

[0067] (3) The baler belt 1 of embodiment 1 may further be configured such that the ratio of the total thickness of the intermediate layers (thickness of the first intermediate layer 203 + thickness of the second intermediate layer 205) to the total thickness of the baler belt 1, which is the thickness of the belt body 2 of the baler belt 1 in the belt thickness direction, is 0.2 or more.

[0068] In this case, in the belt body 2, it is preferable that the ratio of the total thickness of the core canvas layers, i.e., the thickness of the first core canvas layer 202 + the thickness of the second core canvas layer 204 + the thickness of the third core canvas layer 206, to the total thickness of the intermediate layers, i.e., the thickness of the first intermediate layer 203 + the thickness of the second intermediate layer 205, is 0.5 or more. Furthermore, in the belt body 2, it is preferable that the ratio of the total thickness of the intermediate layers (the thickness of the first intermediate layer 203 + the thickness of the second intermediate layer 205) to the total thickness of the cover layers (the thickness of the first cover layer 201 + the thickness of the second cover layer 207) is 0.5 or more.

[0069] (4) In the above-described first and second embodiments, as shown in Fig. 3 and Fig. 4, the one-end connecting member 3 has a configuration in which a plurality of U-shaped metal hooks 31 are arranged side by side in a ⊂ shape as seen from the side, and one end 311 of each hook 31 is connected by one wire 32. The other-end connecting member 4 has a similar configuration. However, the present invention is not limited to this configuration, and it is sufficient that the multiple U-shaped metal hooks of the one-end connecting member and the other-end connecting member are joined along the belt width direction only on one side of either the first cover layer or the second cover layer, and the one-end connecting member and the other-end connecting member may have multiple U-shaped metal hooks arranged in parallel, with claws formed on both ends of each hook, and joined by being integrally molded only on one end of each hook along the belt width direction, as shown in Fig. 9. In other words, a plate type may be used. In this case, the belt body is sandwiched between the claws on both ends of each hook and crimped, that is, the hooks are pressed, thereby attaching the one end side connecting member and the other end side connecting member to one end of the belt body.

[0070] (5) The conveyor belt of the present invention includes not only the baler belt described in each of the above embodiments but also a conveyor belt for conveying, and the description of each of the above embodiments can also be applied to a conveyor belt for conveying. [Example]

[0071] Baler belts according to Examples 1 to 4 and Comparative Example 1 were produced in which the thicknesses of the first cover layer, first core canvas layer, first intermediate layer, second core canvas layer, second intermediate layer, third core canvas layer, and second cover layer that make up the belt body were changed, and a baler belt according to Example 5, which has a belt body consisting of a first cover layer, a first core canvas layer using double-woven canvas, and a second cover layer, and the warpage and flexibility of each baler belt, i.e., the belt body, were compared and evaluated.

[0072] [Making a baler belt] The baler belts of Examples 1 to 4 and Comparative Example 1 were produced using surface cover rubber, back cover rubber, and coating rubber made of a rubber composition containing natural rubber, styrene-butadiene rubber, and various additives, as well as the core canvas shown in Table 1. The baler belt of Example 5 was made from a surface cover rubber, a back cover rubber, and a coating rubber, which were made of a rubber composition containing natural rubber, styrene-butadiene rubber, and various additives, and a double-woven canvas woven by crossing warp yarns and two layers of weft yarns containing monofilament yarns, as described in the above-mentioned Example 3.

[0073] [Structure of core canvas] [Table 1] The core canvases A to D are single-layer canvases, and the warp and weft threads are all multifilament yarns.

[0074] Specifically, as shown in Fig. 8, for Examples 1 to 4 and Comparative Example 1, a belt body having a belt width of 220 mm was produced by crosslinking a laminate consisting of a surface cover rubber, a first core canvas which is a double-coated canvas with coated rubber laminated on both sides, a second core canvas which is a double-coated canvas with coated rubber laminated on both sides, a third core canvas which is a double-coated canvas with coated rubber laminated on both sides, and a back cover rubber, using heat and pressure. For Example 5, a belt body having a belt width of 220 mm was produced by crosslinking a laminate consisting of a surface cover rubber, a first core canvas which is a double-woven canvas with coated rubber laminated on both sides, and a back cover rubber, using heat and pressure. Here, the first core canvas of Examples 1 to 4 and Comparative Example 1 is obtained by immersing core canvases A to D in Table 1 in RFL liquid, and then laminating a coating rubber, which is a rubber composition, on both sides. The second core canvas and the third core canvas are similar to the first core canvas. Furthermore, the first core canvas of Example 5 is obtained by immersing a double-woven canvas, which is woven by crossing warp yarns and two layers of weft yarns including monofilament yarns, as described in the above-mentioned embodiment 3, in RFL liquid, and then laminating a coating rubber, which is a rubber composition, on both sides.

[0075] In the belt body of Examples 1 to 4 and Comparative Example 1, the surface cover rubber and the coated rubber laminated on the surface side of the first core canvas are integrated to form the first cover layer, the coated rubber laminated on the back side of the first core canvas and the coated rubber laminated on the surface side of the second core canvas are integrated to form the first intermediate layer, the coated rubber laminated on the back side of the second core canvas and the coated rubber laminated on the surface side of the third core canvas are integrated to form the second intermediate layer, and the coated rubber laminated on the back side of the third core canvas and the back cover rubber are integrated to form the second cover layer. In other words, as shown in Figure 8, the belt body of Examples 1 to 4 and Comparative Example 1 has a structure in which, from the outer peripheral surface side to the inner peripheral surface side, a first cover layer formed from a cross-linked rubber composition, a first core canvas layer formed from a core canvas, a first intermediate layer formed from a cross-linked rubber composition, a second core canvas layer formed from a core canvas, a second intermediate layer formed from a cross-linked rubber composition, a third core canvas layer formed from a core canvas, and a second cover layer formed from a cross-linked rubber composition are layered. In addition, in the belt body of Example 5, the surface cover rubber and the coating rubber laminated on the surface side of the first core canvas are integrated to form the first cover layer, and the coating rubber laminated on the back side of the first core canvas and the back cover rubber are integrated to form the second cover layer. In other words, the belt body of Example 5 has a structure in which, from the outer peripheral surface side to the inner peripheral surface side, a first cover layer formed from a cross-linked rubber composition, a first core canvas layer formed from a double-woven canvas, and a second cover layer formed from a cross-linked rubber composition are laminated, as shown in Figure 10.

[0076] In Example 1, in order to thicken the core canvas layer, core canvas A is used as the first core canvas and the third core canvas, and core canvas B is used as the second core canvas. In Examples 2, 3, and 4, and Comparative Example 1, core canvas C is used as the first core canvas and the third core canvas, and core canvas D is used as the second core canvas. Furthermore, for Examples 1 to 3 and Comparative Example 1, the configurations and thicknesses of the first cover layer, first core canvas layer, first intermediate layer, second core canvas layer, second intermediate layer, third core canvas layer, and second cover layer are shown in Figure 6 and Table 2. For Example 4, the configurations and thicknesses of the first cover layer, first core canvas layer, first intermediate layer, second core canvas layer, second intermediate layer, third core canvas layer, and second cover layer are shown in Table 2. For Example 5, the configurations and thicknesses of the first cover layer, first core canvas layer, and second cover layer are shown in Table 2. The thickness of each of the first core canvas layer, the second core canvas layer and the third core canvas layer is the distance from the top surface, which is the most superficial position of the warp or weft threads that make up the core canvas, to the bottom surface, which is the most inward position, in a cross section cut parallel to the thickness direction of the belt, and the thickness of the first cover layer, the first intermediate layer, the second intermediate layer and the second cover layer is the thickness of the parts other than the first core canvas layer, the second core canvas layer and the third core canvas layer.

[0077] The rubber hardness of the first cover layer and the second cover layer is A70 for Examples 1 to 3, Example 5, and Comparative Example 1. For Example 4, the rubber hardness of the first cover layer is A70, and the rubber hardness of the second cover layer is A85. Here, the rubber hardness is the hardness (Type A) of the crosslinked rubber composition measured using a Type A durometer in accordance with the spring durometer hardness test specified in JIS K 6253 (2012) (Vulcanized rubber and thermoplastic rubber - Determination of hardness).

[0078] [Attaching the connecting member on one end to the belt body] A one-end connecting member of the U series manufactured by Mato was attached to the belt body by the method described in the first embodiment above.

[0079] [Evaluation of the amount of warpage of the belt body] The belt body with the one end side connecting member attached was placed on a flat table, and the distance between the bottom surface of the belt body and the table at the part with the greatest warp was measured with a ruler.

[0080] [Flexibility evaluation] Using the belt body before the attachment of the one-end connecting member as a sample, the force required to wrap the belt body around a 100 mm diameter round bar at a wrapping angle of 180 degrees was measured. The reciprocal of the measured wrapping force was calculated and expressed as a relative value based on Comparative Example 1. The evaluation results are shown in Table 2.

[0081] [Evaluation results] [Table 2]

[0082] In Comparative Example 1, a conventional product, the amount of warping of the belt body was unacceptably large. In Example 1, which had a thick core canvas layer, the amount of warping of the belt body was kept small, but flexibility was significantly reduced. In Example 2, which had a thick intermediate layer, the amount of warping of the belt body was kept small compared to Comparative Example 1, but flexibility was slightly reduced. In Example 3, in which the second cover layer was thicker than the first cover layer, the amount of warping of the belt body was reduced while maintaining good flexibility. In Example 4, in which the rubber hardness of the second cover layer was changed to A85 compared to Example 3, the flexibility was slightly reduced compared to Example 3, but the amount of warpage was smaller than Example 3. In Example 5, which used a core canvas containing a thick monofilament yarn as the weft yarn, the amount of warping was minimized with almost no decrease in flexibility compared to Comparative Example 1. [Explanation of symbols]

[0083] 1,300 Baler belt (conveyor belt) 2, 312 Belt body (end-shaped belt) 201 First cover layer 202 1st core canvas layer 203 First Middle Class 204 2nd core canvas layer 205 Second Middle Class 206 Third core canvas layer 207 Second Cover Layer 3 One-end connecting member (pair of connecting members) 31 Hook 4. Other end connecting member (pair of connecting members) 6-pin 301 First cover layer 302 Core canvas layer 320 warp threads 3301 Upper weft 3302 Lower weft 3301A·3302A Monofilament Yarn 330 weft 307 Second Cover Layer

Claims

1. a first cover layer that forms an outer circumferential surface; a second cover layer that forms an inner circumferential surface; A belt having at least one end laminated therein, and a core canvas layer laminated between the first cover layer and the second cover layer and including a canvas material; and a pair of connecting members attached to both ends of the belt in the longitudinal direction, each of which has a plurality of U-shaped hooks arranged in parallel at predetermined intervals along the width direction of the belt so as to sandwich the belt, and which are connected to each other, a pair of connecting members, the plurality of U-shaped hooks of which are fitted to the plurality of U-shaped hooks of the other of which are connected by inserting pins into holes formed in the belt width direction, the plurality of U-shaped hooks of the pair of connecting members are joined along the belt width direction only on one side of either the first cover layer or the second cover layer, a thickness of one of the first cover layer and the second cover layer on a side where the plurality of U-shaped hooks of the pair of connecting members are joined along the belt width direction is greater than a thickness of the other of the first cover layer and the second cover layer.

2. 2. The conveyor belt of claim 1, wherein a ratio of a thickness of said one of said first cover layer and said second cover layer to a total thickness of said conveyor belt is equal to or greater than 0.

35.

3. the first cover layer and the second cover layer are formed of a rubber composition, 2. The conveyor belt according to claim 1, wherein one of the first cover layer and the second cover layer, which is on a side where the plurality of U-shaped hooks of the pair of connecting members are joined along the belt width direction, has a Type A hardness of A80 to A90 as measured with a Type A durometer.

4. 4. The conveyor belt according to claim 3, wherein one of the first cover layer and the second cover layer on a side where the plurality of U-shaped hooks of the pair of connecting members are joined along the belt width direction has a higher hardness than the other of the first cover layer and the second cover layer.

5. a first cover layer that forms an outer circumferential surface; a second cover layer that forms the inner circumferential surface; At least two core canvas layers laminated between the first cover layer and the second cover layer and including a canvas material; At least one intermediate layer is laminated between the core canvas layers. and a pair of connecting members attached to both ends of the belt in the longitudinal direction, each of which has a plurality of U-shaped hooks arranged in parallel at predetermined intervals along the width direction of the belt so as to sandwich the belt, and which are connected to each other, a pair of connecting members, the plurality of U-shaped hooks of which are fitted to the plurality of U-shaped hooks of the other of which are connected by inserting pins into holes formed in the belt width direction, the plurality of U-shaped hooks of the pair of connecting members are joined along the belt width direction only on one side of either the first cover layer or the second cover layer, A conveyor belt, wherein a ratio of a total thickness of the intermediate layer to a total thickness of the conveyor belt is 0.2 or more.

6. a first cover layer that forms an outer circumferential surface; a second cover layer that forms an inner circumferential surface; A belt having at least one end laminated therein, and a core canvas layer laminated between the first cover layer and the second cover layer and including a canvas material; and a pair of connecting members attached to both ends of the belt in the longitudinal direction, each of which has a plurality of U-shaped hooks arranged in parallel at predetermined intervals along the width direction of the belt so as to sandwich the belt, and which are connected to each other, a pair of connecting members, the plurality of U-shaped hooks of which are fitted to the plurality of U-shaped hooks of the other of which are connected by inserting pins into holes formed in the belt width direction, The core canvas layer includes a woven fabric woven by crossing warp yarns arranged in a direction parallel to the belt length direction and weft yarns arranged in a direction parallel to the belt width direction, A conveyor belt, wherein the weft yarns comprise monofilament yarns.

7. The conveyor belt according to claim 6, wherein the core canvas layer includes a multi-woven fabric in which the weft yarns are arranged in at least two layers and the weft yarns and the warp yarns of each layer are woven crosswise.

8. The conveyor belt according to any one of claims 1 to 7, which is used in a roll baler that rolls grass into a cylindrical shape and packs it.

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