Conveyor belt and method for stretching the same

Abstract

To provide a conveyor belt which can improve the (tensile) strength of a joint part even in the case where extension is performed by adding a belt.SOLUTION: A conveyor belt 100 includes a belt body 1 and an extension belt 2, and extension is possible by connecting the extension belt 2 to the belt body 1. The belt body 1 and the extension belt 2 include core body canvas layers 10, 20 for reinforcing the belt body 1 and the extension belt 2, and core body cover layers 11a, 11b, 21a, 22a for covering and protecting the core body canvas layers 10, 20, respectively. At the core body canvas layers 10, 20, there are provided planar joint parts 12, 22 which are arranged at the end part in the longer direction of the belt body 1 and the extension belt 2, and which are constituted by the same material as that of the core body canvas layers 10, 20. The belt body 1 and the extension belt 2 are connected by a common core material 3 being mounted on the joint parts 12, 22 with each other.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a conveyor belt and a method for stretching a conveyor belt, and more particularly to a conveyor belt and a method for stretching a conveyor belt in which stretching is performed by splicing the belt. [Background technology]

[0002] BACKGROUND ART Conventionally, a conveyor belt and a method for stretching a conveyor belt in which the belt is stretched by adding a belt are known (see, for example, Patent Document 1).

[0003] Patent Document 1 discloses a conveyor belt that is stretched by joining the belt. The conveyor belt includes a reinforcing core layer made of canvas and a linear joint portion formed by a wire embedded in the reinforcing core layer by joining. The stretched belt to be joined to the conveyor belt also includes a reinforcing core layer and a linear joint portion formed by a wire embedded in the reinforcing core layer by joining. The conveyor belt and the stretched belt to be joined are connected by attaching a common rod-shaped connecting member to each of the linear joint portions. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 3428498 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the conveyor belt described in Patent Document 1, the joint portion is formed linearly with a wire, and therefore, when tension is applied to the conveyor belt, a large force is concentrated at the joint between the linear joint portion and the reinforcing core layer, resulting in a problem that the joint strength (tensile strength) of the joint portion may not be sufficiently secured against the tension of the conveyor belt.

[0006] The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to provide a conveyor belt and a method for stretching a conveyor belt that can improve the (tensile) strength of the joint portion even when the belt is stretched by joining the belt. [Means for solving the problem]

[0007] In order to achieve the above object, the conveyor belt of this invention is a conveyor belt that comprises a belt body and an extension belt, and can be extended by connecting the extension belt to the belt body. Each of the belt body and extension belt includes a core canvas layer that reinforces the belt body and extension belt, and a core cover layer that covers and protects the core canvas layer. The core canvas layer has planar joint portions that are arranged at the longitudinal ends of the belt body and extension belt and are made of the same material as the core canvas layer or a material of the same quality as or stronger than the core canvas layer. The belt body and extension belt are configured to be connected by attaching connecting members to each other's joint portions. The connecting member includes a connecting fitting having a first hole portion and a second hole portion, a rod-shaped first core material that is passed through the first hole portion, and a rod-shaped second core material that is passed through the second hole portion, and the joint portion of the belt main body and the joint portion of the stretched belt are formed in an annular shape, and the belt main body and the stretched belt are connected by passing the first core material through the joint portion of the belt main body and the first hole portion of the connecting fitting, and passing the second core material through the joint portion of the stretched belt and the second hole portion of the connecting fitting, with the joint portion of the belt main body and the joint portion of the stretched belt facing each other in the longitudinal direction of the belt main body and the stretched belt. are.

[0008] In the conveyor belt of this invention, as described above, the core canvas layer is provided with planar joints arranged at the longitudinal ends of the belt body and the stretched belt, and made of the same material as the core canvas layer, or a material of the same quality as or stronger than the core canvas layer. The belt body and the stretched belt are connected by attaching connecting members to the joints. Because the joints are formed in a planar shape, the connecting portion (boundary) between the joints and the core canvas layer can be secured relatively large compared to conventional linear joints. As a result, it is possible to prevent large forces from concentrating at the boundary between the joints and the core canvas layer serving as a reinforcing material. Furthermore, by forming the joints from the same material as the core canvas layer, or a material of the same quality as the core canvas layer, or a material of higher strength than the core canvas layer, the joints can be formed with the same tensile strength as the core canvas layer. As a result, even when the belt is extended by joining, the (tensile) strength of the joint portion of the conveyor belt can be improved. Furthermore, the connecting fitting, the first core material, and the second core material allow the joint portions of the belt body and the stretched belt to be connected in a face-to-face state in the longitudinal direction of the belt body and the stretched belt. As a result, compared to when the joint portions of the belt body and the stretched belt are arranged to alternately mesh in the short direction (width direction) of the belt body and the stretched belt, the width of the joint portions of the belt body and the stretched belt can be made larger, and the tensile strength of the joint portions of the belt body and the stretched belt can be increased.

[0009] In the conveyor belt according to the above invention, preferably, the joints of the belt body and the stretched belt are formed into a ring shape when viewed from the short direction of each of the belt body and the stretched belt by folding back the end of the joint and joining it to the core canvas layer, and the belt body and the stretched belt are connected by passing a common connecting member through the ring-shaped joint of the belt body and the joint of the stretched belt. With this configuration, the belt body and the stretched belt can be easily connected by simply folding back the end of the joint and joining it to the core canvas layer, and passing the common connecting member through the ring-shaped joint. Furthermore, since the joints are made of the same material as the core canvas layer or a material of the same quality as or stronger than the core canvas layer, the joints and the core canvas layer can be firmly joined.

[0010] In the conveyor belt according to the above invention, the joints of the belt main body and the extension belt are preferably formed in a comb-tooth shape when viewed in the thickness direction of the belt main body and the extension belt. This configuration allows the comb-tooth joints to distribute the tension acting on the joints in a balanced manner, thereby further improving the (tensile) strength of the joints of the conveyor belt. Furthermore, it is possible to suppress relative positional deviation between the joints at the connection points in the belt width direction.

[0011] In the conveyor belt according to the above invention, the joints of the belt body and the extension belt are preferably formed directly on the core canvas layer by processing the core canvas layer itself. By configuring in this way, the joint surface at the boundary between the core canvas layer and the joint can be reduced compared to when the core canvas layer and the joint are separate members.

[0012]

[0013]

[0014] In the conveyor belt of the above invention, the material of the same quality as or stronger than the core canvas layer preferably includes rayon, vinylon, nylon, or polyester. By configuring the joint portion from rayon, vinylon, nylon, or polyester, which is the same quality as or stronger than the core canvas layer, and changing the knitting method, number of core wires, etc., it is possible to form the joint portion with the same strength as or stronger than the core canvas layer. As a result, even when the belt is joined and stretched, it is possible to improve the (tensile) strength of the joint portion of the conveyor belt.

[0015] The conveyor belt according to the above invention preferably further comprises joint cover layers that individually cover and protect the joints of the belt body and the extension belt, respectively. With this configuration, the joint cover layers can prevent deterioration of the joints (connecting portions) exposed from the core cover layer due to wear caused by transported goods, adhesion of foreign matter, etc.

[0016]

[0017] In the conveyor belt according to the above invention, the joint portion of the belt body preferably includes a first joint portion arranged at one longitudinal end of the belt body and a second joint portion arranged at the other longitudinal end of the belt body and connectable to the first joint portion, and the joint portion of the stretched belt preferably includes a third joint portion arranged at one longitudinal end of the stretched belt and connectable to the first joint portion, and a fourth joint portion arranged at the other longitudinal end of the stretched belt and connectable to the second joint portion. With this configuration, during belt stretching, the state in which the first joint portion of the belt body and the second joint portion are connected can be easily changed to a state in which the first joint portion of the belt body and the third joint portion of the stretched belt are connected and the second joint portion of the belt body and the fourth joint portion of the stretched belt are connected by releasing the connection between the first joint portion and the second joint portion. That is, since the belt main body is provided with the first joint portion and the second joint portion in advance, it is possible to eliminate the need to form the first joint portion and the second joint portion on the belt main body at a work site such as inside a tunnel, and therefore the conveyor belt can be easily stretched in a short time.

[0018] The conveyor belt according to the above invention is preferably a tunnel conveyor belt that is installed and used inside a tunnel. With this configuration, even when a long conveyor belt is needed inside a tunnel and the belt is extended by joining, the (tensile) strength of the joint portion of the conveyor belt can be improved.

[0019]

[0020]

[0021]

[0022] In this case, preferably, at least one connecting fitting is disposed at one end of the joint portion of the belt main body and the joint portion of the stretched belt, and one at the other end, in the short direction of the belt main body and the stretched belt. With this configuration, the connecting fitting, which is configured to receive the tension of the belt main body and the stretched belt, is disposed so as to sandwich the joint portion of the belt main body and the joint portion of the stretched belt in the short direction of the belt main body and the stretched belt, so that the connected state of the belt main body and the stretched belt can be stably maintained.

[0023] In a configuration in which one connecting fitting is provided at each of one end and the other end of the joints of the belt main body and the extension belt, preferably, the joints of the belt main body and the extension belt are formed in a comb-tooth shape when viewed in the thickness direction of the belt main body and the extension belt, and connecting fittings are arranged not only at each end and the other end of the joints of the belt main body and the extension belt, but also in gaps between the comb-tooth joints of the belt main body and the extension belt. With this configuration, connecting fittings are also arranged in gaps between the comb-tooth joints of the belt main body and the extension belt, making it possible to more stably maintain the connected state of the belt main body and the extension belt.

[0024] In the above-described configuration in which the connecting member includes a connecting fitting, a first core material, and a second core material, it is preferable to further include retaining members attached near the ends of each of the first core material and the second core material to prevent each of the first core material and the second core material from coming off the joint. With this configuration, the retaining members can prevent the first core material and the second core material from falling off, thereby stably maintaining the attached state of the first core material and the second core material.

[0025] The stretching method of the present invention is a method of stretching a conveyor belt by connecting a stretching belt to a belt body, and at the longitudinal ends of each of the belt body and the stretching belt, a core canvas layer that reinforces each of the belt body and the stretching belt is provided with a planar canvas layer made of the same material as the core canvas layer or a material of the same quality as the core canvas layer or a material with higher strength than the core canvas layer. and cyclic and a step of attaching a connecting member to each of the joints of the belt body and the stretched belt, thereby connecting the stretched belt to the belt body, thereby stretching the belt. The connecting member includes a connecting fitting having a first hole portion and a second hole portion, a rod-shaped first core material that is passed through the first hole portion, and a rod-shaped second core material that is passed through the second hole portion, and the stretching step includes a step of connecting the belt main body and the stretched belt by passing the first core material through the joint portion of the belt main body and the first hole portion of the connecting fitting and passing the second core material through the joint portion of the stretched belt and the second hole portion of the connecting fitting, with the joint portion of the belt main body and the joint portion of the stretched belt facing each other in the longitudinal direction of the belt main body and the stretched belt. .

[0026] The conveyor belt stretching method of this invention, as described above, includes the steps of providing planar joints at the longitudinal ends of the belt body and stretched belt in the core canvas layer that reinforces the belt body and stretched belt, made of the same material as the core canvas layer, or a material of the same quality as or stronger than the core canvas layer, and attaching connecting members to the joints of the belt body and stretched belt to connect the stretched belt to the belt body, thereby stretching the belt. Because the joints are formed in a planar shape, the area (boundary) connecting the joints and the core canvas layer can be secured relatively large compared to conventional linear joints. As a result, it is possible to prevent large forces from concentrating at the boundary between the joints and the core canvas layer that serves as a reinforcing material. In addition, by constructing the joint portion from the same material as the core canvas layer, or from a material of the same quality as or stronger than the core canvas layer, the joint portion can be formed to have the same tensile strength as the core canvas layer. As a result, a conveyor belt stretching method can be provided that can improve the (tensile) strength of the joint portion of the conveyor belt even when stretching by adding belts. Furthermore, the connecting fitting, the first core material, and the second core material allow the joint portions of the belt body and the stretched belt to be connected in a face-to-face state in the longitudinal direction of the belt body and the stretched belt. As a result, compared to when the joint portions of the belt body and the stretched belt are arranged to alternately mesh in the short direction (width direction) of the belt body and the stretched belt, the width of the joint portions of the belt body and the stretched belt can be made larger, and the tensile strength of the joint portions of the belt body and the stretched belt can be increased. [Effects of the Invention]

[0027] According to the present invention, as described above, it is possible to provide a conveyor belt and a method for stretching a conveyor belt that can improve the (tensile) strength of the joint portion even when the belt is stretched by joining the belt. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 1 is a schematic diagram showing an outline of an extension conveyor equipped with a conveyor belt according to a first (second to fourth) reference example. [Figure 2] 1A to 1C are schematic diagrams for explaining the procedure of a method for extending a conveyor belt by adding an extension belt to a belt body according to a first reference example. [Figure 3] FIG. 1 is an exploded perspective view of a conveyor belt according to a first reference example. [Figure 4] FIG. 1 is a plan view of a conveyor belt according to a first reference example. [Figure 5] 10A to 10C are diagrams for explaining the procedure of a method for forming a joint portion of a conveyor belt according to a first reference example. [Figure 6] FIG. 10 is an exploded perspective view of a conveyor belt according to a second reference example. [Figure 7] 10A to 10C are diagrams for explaining the procedure of a method for forming a joint portion of a conveyor belt according to a second reference example. [Figure 8] FIG. 10 is an exploded perspective view of a conveyor belt according to a third reference example. [Figure 9] 10A to 10C are diagrams for explaining the procedure of a method for forming a joint portion of a conveyor belt according to a third reference example. [Figure 10] FIG. 10 is an exploded perspective view of a conveyor belt according to a fourth embodiment of the present invention. [Figure 11] 10A to 10C are diagrams for explaining the procedure of a method for forming a joint portion of a conveyor belt according to a fourth reference example. [Figure 12] FIG. 1 is an exploded perspective view of a conveyor belt according to an embodiment. [Figure 13] FIG. 1 is a plan view of a conveyor belt according to an embodiment. [Figure 14]10A to 10C are diagrams for explaining a procedure of a method for forming a joint portion of a conveyor belt according to an embodiment. [Figure 15] FIG. 2 is a side view showing a first (second) core of the conveyor belt according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0029] below, Reference examples and An embodiment of the present invention will be described with reference to the drawings.

[0030] [1st Reference example ] Referring to FIGS. 1 to 5, Reference example The structure of the conveyor belt 100 will be described. The conveyor belt 100 is a tunnel conveyor belt used inside a tunnel. The conveyor belt 100 is one component of the extension conveyor C.

[0031] The extension conveyor C shown in Fig. 1 is a transport device for long excavation debris EM installed inside a tunnel, and is configured to transport excavation debris EM generated during tunnel excavation to the vicinity of the tunnel entrance on a conveyor belt 100. Excavation debris EM is rock blocks, earth, sand, etc. excavated from the natural ground during tunnel excavation.

[0032] (Stretching conveyor configuration) The extension conveyor C includes a circular conveyor belt 100, a head pulley device 101 on the wellhead side, a tail pulley device 102 on the face (excavation surface) side, a belt storage device 103, and a belt drive device 104.

[0033] The head pulley device 101 has a head pulley 101a on the wellhead side around which the conveyor belt 100 is wound. The tail pulley device 102 has a tail pulley 102a on the face (excavation surface) side around which the conveyor belt 100 is wound.

[0034] That is, the extension conveyor C is a transport system that transports excavated debris EM by a conveyor belt 100 wound between a tail pulley 102a on the face side and a head pulley 101a on the wellhead side. The generated excavated debris EM is collected by a transport vehicle H such as a wheel loader, crushed into small pieces to a transportable size by a self-propelled crusher CR, and then loaded onto the tail pulley device 102.

[0035] Here, the head pulley device 101 (head pulley 101a) is fixedly installed near the tunnel entrance. On the other hand, the tail pulley device 102 (tail pulley 102a) is configured to be movable and advances deeper into the tunnel as the tunnel face advances. As the tail pulley device 102 (tail pulley 102a) advances, the conveyor belt 100 is extended.

[0036] The belt storage device 103 is disposed between the head pulley device 101 and the tail pulley device 102. The belt storage device 103 holds an extension (excess length) of the conveyor belt 100 secured in advance by winding it around multiple pairs of pulleys 103a, 103b. The belt storage device 103 stores the conveyor belt 100 by winding it in a meandering shape using multiple pairs of pulleys 103a, 103b. The belt storage device 103 is configured to extend the conveyor belt 100 by reducing the distance between the paired pulleys 103a, 103b (bringing 103a and 103b closer to each other).

[0037] The belt drive device 104 is a drive device that drives the conveyor belt 100 wound around the tail pulley device 102, the head pulley device 101, and the belt storage device 103. The belt drive device 104 has a drive pulley 104a that is rotationally driven by, for example, a hydraulic motor, and is configured to circulate the conveyor belt 100 by rotationally driving the drive pulley 104a around which the conveyor belt 100 is wound.

[0038] (Conveyor belt configuration) The conveyor belt 100 shown in Figure 1 is tensioned by a belt storage device 103. The conveyor belt 100 is supported between each device of the extension conveyor C by a conveyor frame F equipped with rollers.

[0039] In addition to being stretched by the belt storage device 103, the conveyor belt 100 (belt body 1) is configured so that it can be stretched by adding a new belt (stretching belt 2) when the stretching of the conveyor belt 100 by the belt storage device 103 reaches or nearly reaches its limit (see Figure 2).

[0040] Here, in the following description, reference will be made to FIGS. 3 to 5 (second Reference example In the following Figures 6 to 15, the thickness direction of the conveyor belt 100 is indicated by the Z direction, the longitudinal direction of the conveyor belt 100 is indicated by the X direction, and the short side direction (width direction) of the conveyor belt 100 is indicated by the Y direction.

[0041] The conveyor belt 100 shown in Figs. 3 to 5 includes a belt body 1, an extension belt 2, a rod-shaped common core material 3, and a joint cover layer 4 that covers and protects the joint between the belt body 1 and the extension belt 2. The belt body 1 and the extension belt 2 have the same joint structure. Reference example In the following Figures 6, 8 and 10, for ease of understanding, a simplified configuration is shown by omitting the illustration of the joint portion cover layer 4. The common core material 3 is an example of a "connecting member" in the claims.

[0042] As shown in Fig. 2A, in the early stage of tunnel excavation work, only the belt body 1 is installed on the extension conveyor C. In this state, the first joint portion 12a of the belt body 1 and the second joint portion 12b of the belt body 1 are connected (see Figs. 1 and 2A).

[0043] As shown in FIG. 2B, when the extension by the belt storage device 103 reaches its limit (almost its limit) as the tunnel excavation work progresses, that is, when the excess portion of the belt body 1 becomes small, the connection between the first joint portion 12a of the belt body 1 and the second joint portion 12b of the belt body 1 is released.

[0044] 2C, the stretched belt 2 is joined (connected) to the belt body 1. At this time, the first joint portion 12a of the belt body 1 is connected to the third joint portion 22a of the stretched belt 2. In addition, the second joint portion 12b of the belt body 1 is connected to the fourth joint portion 22b of the stretched belt 2.

[0045] (Belt body configuration) The belt body 1 shown in FIGS. 3 to 5 includes a core canvas layer 10, core cover layers 11a and 11b, and a joint portion 12 including a first joint portion 12a and a second joint portion 12b.

[0046] <Structure of the "core canvas layer" of the belt body> The core canvas layer 10 is made of canvas. The core canvas layer 10 is a layer for increasing the tensile strength of the belt body 1 and reinforcing it. The core canvas layer 10 is provided over almost the entire length and width of the conveyor belt 100. The core canvas layer 10 is formed in a rectangular shape. The core canvas layer 10 has a single-layer structure.

[0047] <Structure of the "core cover layer" of the belt body> The core cover layer 11a and the core cover layer 11b are made of rubber. The core cover layer 11a covers and protects the core canvas layer 10 from one side in the thickness direction of the conveyor belt 100 (Z1 direction). The core cover layer 11b covers and protects the core canvas layer 10 from the other side in the thickness direction of the conveyor belt 100 (Z2 direction). In other words, the core cover layer 11a and the core cover layer 11b sandwich the core canvas layer 10. The core cover layer 11a and the core cover layer 11b are formed in the same rectangular shape.

[0048] As an example, the core cover layer 11a and the core cover layer 11b are vulcanization bonded to the core cover layer 11a. Furthermore, the core cover layer 11a and the core cover layer 11b are vulcanization bonded directly to each other on both sides in the short direction (Y direction) of the conveyor belt 100 without the core cover layer 11a in between. Note that sulfur is used for vulcanization bonding, and the rubber molecular structure is changed by heating and pressurizing during vulcanization bonding, causing the rubber molecules to become entangled, thereby forming a superelastic material.

[0049] <Configuration of the "first joint" and "second joint" of the belt body> The first joint portion 12a is disposed at one longitudinal end of the belt body 1. The second joint portion 12b is disposed at the other longitudinal end of the belt body 1. Since the second joint portion 12b has a similar configuration to the first joint portion 12a, the following description will mainly focus on the first joint portion 12a. The third joint portion 22a and the fourth joint portion 22b of the stretched belt 2 also have a similar configuration to the first joint portion 12a.

[0050] The first joint portion 12a is formed directly on the core canvas layer 10 by processing the core canvas layer 10. Therefore, the first joint portion 12a is formed in a planar shape from the same material as the core canvas layer 10. As an example, the size of the first joint portion 12a in the width direction (Y direction) is at least larger than the thickness (size in the Z direction) of the conveyor belt 100.

[0051] Here, a method for forming the first joint portion 12a of the belt body 1 will be described.

[0052] First, as shown in Figure 5A, one longitudinal end of the core canvas layer 10 is exposed from the core cover layers 11a, 11b. In other words, one longitudinal end of the core canvas layer 10 is made longer than the core cover layers 11a, 11b. Then, multiple rectangular cuts N are formed at one longitudinal end of the core canvas layer 10, aligned at equal intervals in the short direction (Y direction).

[0053] Next, as shown in Figure 5B, one longitudinal end of the core canvas layer 10 is folded back and sandwiched between the core cover layers 11a and 11b, forming multiple (four) annular portions R at one longitudinal end of the core canvas layer 10. The multiple (four) annular portions R are arranged in a row in the short direction (Y direction). At this time, one side of the folded back core canvas layer 10 abuts against the core canvas layer 10 itself, and the other side of the folded back core canvas layer 10 abuts against the core cover layer 11a.

[0054] Next, as shown in FIG. 5C, one longitudinal end of the folded core canvas layer 10 is joined to the core canvas layer 10 itself and the core cover layers 11a and 11b. This forms the first joint portion 12a. The exposed joint portion 12 (12a, 12b) is covered and protected by a joint portion cover layer 4. Thereafter, as shown in FIG. 5D, the formed first joint portion 12a is connected to the third joint portion 22a of the stretched belt 2 by a common core material 3. The connected first and third joint portions may also be covered by an outermost cover layer (not shown) that further covers the joint portion cover layer from the outer periphery.

[0055] As shown in FIG. 4, the first joint portion 12a is formed in a comb-like shape by having multiple notches N and multiple annular portions R arranged alternately in the width direction (Y direction) of the belt body 1 when viewed from the thickness direction (Z direction) of the belt body 1.

[0056] The first joint portion 12a is configured to be connectable to the second joint portion 12b. Moreover, the first joint portion 12a is configured to be connectable to the third joint portion 22a of the stretched belt 2 instead of the second joint portion 12b.

[0057] In detail, the first joint part 12a and the second joint part 12b are configured to be connected by passing the common core material 3 through the annular part R in a state where the comb teeth are engaged so as to alternately mesh with each other (a state where the annular parts R are arranged so as to alternately line up). Similarly, the first joint part 12a and the second joint part 12b are configured to be connected by passing the common core material 3 through the annular part R in a state where the comb teeth are engaged so as to alternately mesh with each other. Note that when connected, the multiple annular parts R of the first joint part 12a and the multiple annular parts R of the second joint part 12b are arranged alternately with almost no gaps in the short direction (Y direction).

[0058] The first joint portion 12a and the second joint portion 12b are configured to be provided to the belt body 1 in advance in a factory or the like before the start of tunnel excavation work. In other words, the first joint portion 12a and the second joint portion 12b are not configured to be provided to the belt body 1 during tunnel excavation work. However, the first joint portion 12a and the second joint portion 12b may be provided to the belt body 1 afterward inside the tunnel.

[0059] (Stretched belt configuration) 3 and 4 is configured to be added to the belt body 1 to stretch the conveyor belt 100. As described above, the stretching belt 2 has the same connection structure as the belt body 1 already described, and therefore, the stretching belt 2 will be briefly described below.

[0060] The stretched belt 2 includes a core canvas layer 20, core cover layers 21a and 21b, and a joint portion 22 including a third joint portion 22a and a fourth joint portion 22b.

[0061] The third joint part 22a is configured to be connectable to the first joint part 12a that has been disconnected from the second joint part 12b in order to stretch the conveyor belt 100. The fourth joint part 22b is configured to be connectable to the second joint part 12b that has been disconnected from the first joint part 12a in order to stretch the conveyor belt 100.

[0062] The stretching belt 2 is configured to be manufactured in advance in a factory or the like before the start of tunnel excavation work. In other words, the stretching belt 2 is not configured to be manufactured inside the tunnel during tunnel excavation work, but may be attached to the stretching belt 2 body outside the tunnel beforehand or inside the tunnel afterwards.

[0063] (Common core material configuration) The rod-shaped common core material 3 is formed in the shape of a long, thin cylinder or an elliptical (oval) cylinder. The common core material 3 is configured to extend in the short direction of the conveyor belt 100 and to be passed through the annular portion R of the first joint portion 12a and the annular portion R of the second joint portion 12b, thereby connecting the first joint portion 12a and the second joint portion 12b. The common core material 3 has stopper members on both ends to prevent it from coming out of the annular portions R.

[0064] The first joint portion 12a and the second joint portion 12b are formed from canvas, and when tension is applied to the conveyor belt 100, they can deform into a shape that conforms to the outer shape of the common core material 3. Therefore, when the common core material 3 is passed through the first joint portion 12a and the second joint portion 12b, it abuts against the first joint portion 12a and the second joint portion 12b by surface contact.

[0065] In other words, compared to conventional belts connected using linear coupling members such as wires or metal fittings, the conveyor belt 100 can avoid large forces acting locally on the core canvas layer 10.

[0066] The common core 3 is configured to connect the first joint portion 12a and the third joint portion 22a, and the common core 3 is configured to connect the second joint portion 12b and the fourth joint portion 22b.

[0067] (Configuration of joint cover layer) The joint portion cover layer 4 is made of rubber. The joint portion cover layer 4 forms a protective layer by covering the comb-shaped joint portions (12a, 22a) when the joint portions (12a, 22a) of the belt main body 1 and the stretched belt 2 are formed. In this case, the covering work of the joint portion cover layer 4 can be omitted during the stretching work inside the tunnel. Furthermore, the outermost cover layer may be configured to cover and protect the joint portion and connecting member when the belt main body and the stretched belt are connected. In this case, the covering work of the outermost cover layer is necessary during the stretching work inside the tunnel. This outermost cover layer is removed when the connection between the first joint portion and the second joint portion is released. The outermost cover layer is formed, for example, from the same material as the joint portion cover layer.

[0068] (Method of stretching a conveyor belt) Next, a method for stretching the conveyor belt 100 (belt body 1) will be described.

[0069] First, as explained above in the "Method for forming the first joint portion 12a" with reference to Figure 5, the joint portion 12 is provided in advance in the core canvas layer 10 of the belt body 1 at the factory. Similarly, the joint portion 22 is provided in the core canvas layer 10 of the stretched belt 2. Then, the first joint portion 12a and the second joint portion 12b are connected to form the belt body 1 into a ring shape (see Figure 2A).

[0070] Next, as shown in FIG. 2B, when the conveyor belt 100 needs to be extended by adding a new joint, the first joint portion 12a and the second joint portion 12b of the belt body 1 are disconnected. At this time, if an outermost cover layer is applied, it is necessary to remove the outermost cover layer covering the first joint portion and the second joint portion. Then, the common core material 3 passing through the first joint portion 12a and the second joint portion 12b is removed. Then, the first joint portion 12a and the second joint portion 12b are separated from each other.

[0071] Next, as shown in Fig. 2C, the first joint portion 12a of the belt body 1 and the third joint portion 22a of the stretched belt 2 are connected by a common core material 3. Furthermore, the second joint portion 12b of the belt body 1 and the fourth joint portion 22b of the stretched belt 2 are connected by the common core material 3. In this way, the conveyor belt 100 (belt body 1) is stretched.

[0072] (1st Reference example (Effect of No. 1 Reference example Then, the following effects can be obtained:

[0073] No. 1 Reference example As described above, the core canvas layers 10, 20 are provided with planar joint sections 12, 22, which are arranged at the longitudinal ends of the belt body 1 and the stretched belt 2 and are made of the same material as the core canvas layers 10, 20, or a material of the same quality as or stronger than the core canvas layers 10, 20, and the belt body 1 and the stretched belt 2 are configured to be connected by attaching a common connecting member (common core material 3) to each joint section 12, 22. As a result, the joint sections 12, 22 are formed in a planar shape, which makes it possible to ensure a relatively large area (boundary) connecting the joint sections 12, 22 and the core canvas layers 10, 20 compared to conventional joint sections formed in a linear shape. As a result, it is possible to prevent force from concentrating at the boundary between the joint sections 12, 22 and the core canvas layers 10, 20, which act as reinforcing materials, and thus to prevent large forces from acting. Furthermore, by constructing the joints 12, 22 from the same material as the core canvas layers 10, 20, or from a material of the same quality as or stronger than the core canvas layers 10, 20, the joints 12, 22 can be formed with the same tensile strength as the core canvas layers 10, 20. As a result, the (tensile) strength of the joints 12, 22 of the conveyor belt 100 can be improved even when the belt is extended by joining.

[0074] No. 1 Reference exampleAs described above, the joints 12, 22 of the belt body 1 and the stretched belt 2 are formed into a ring shape when viewed from the short direction of each of the belt body 1 and the stretched belt 2 by folding back the ends of the joints 12, 22 and vulcanizing them to the core canvas layers 10, 20, and the belt body 1 and the stretched belt 2 are connected by passing a common connecting member (common core material 3) through the annular joints 12 of the belt body 1 and the joints 22 of the stretched belt 2. This makes it possible to easily connect the belt body 1 and the stretched belt 2 by simply folding back the ends of the joints 12, 22 and vulcanizing them to the core canvas layers 10, 20, and passing a common connecting member (common core material 3) through the annularly formed joints 12, 22. Furthermore, since the joint portions 12, 22 are made of the same material as the core canvas layers 10, 20, or of a material of the same quality as or stronger than the core canvas layers 10, 20, the joint portions 12, 22 and the core canvas layers 10, 20 can be firmly joined (by vulcanization joining).

[0075] No. 1 Reference example As described above, the joint portions 12, 22 of the belt body 1 and the extension belt 2 are formed in a comb-tooth shape when viewed in the thickness direction of the belt body 1 and the extension belt 2. This allows the comb-tooth-shaped joint portions 12, 22 to distribute the tension acting on the joint portions 12, 22 in a balanced manner, thereby further improving the (tensile) strength of the joint portions 12, 22 of the conveyor belt 100. In addition, it is possible to suppress relative positional deviation in the belt width direction between the joint portions 12, 22 at the connection points.

[0076] No. 1 Reference example As described above, the joints 12, 22 of the belt body 1 and the stretched belt 2 are formed directly on the core canvas layers 10, 20 by processing the core canvas layers 10, 20 themselves. This makes it possible to reduce the bonding surface area at the boundary between the core canvas layers 10, 20 and the joints 12, 22 compared to when the core canvas layers 10, 20 and the joints 12, 22 are separate components.

[0077] No. 1 Reference exampleAs described above, the stretched belt 2 further includes a joint portion cover layer 4 that individually covers and protects the joint portion 12 of the belt body 1 and the joint portion 22 of the stretched belt 2. This makes it possible for the joint portion cover layer 4 to prevent deterioration of the joint portions 12, 22 (connecting portions) exposed from the core cover layers 11a, 11b, 21a, 21b due to wear caused by transported goods or adhesion of foreign matter.

[0078] No. 1 Reference example As described above, the joint portion 12 of the belt body 1 includes a first joint portion 12a arranged at one longitudinal end of the belt body 1 and a second joint portion 12b arranged at the other longitudinal end of the belt body 1 and connectable to the first joint portion 12a, and the joint portion 22 of the stretched belt 2 includes a third joint portion 22a arranged at one longitudinal end of the stretched belt 2 and connectable to the first joint portion 12a, and a fourth joint portion 22b arranged at the other longitudinal end of the stretched belt 2 and connectable to the second joint portion 12b. As a result, during belt stretching, the state in which the first joint portion 12a and the second joint portion 12b of the belt body 1 are connected can be easily changed to a state in which the first joint portion 12a and the second joint portion 12b are disconnected and the first joint portion 12a of the belt body 1 is connected to the third joint portion 22a of the stretched belt 2 and the second joint portion 12b of the belt body 1 is connected to the fourth joint portion 22b of the stretched belt 2. In other words, since the belt body 1 is provided with the first joint portion 12a and the second joint portion 12b in advance, it is possible to eliminate the need to form the first joint portion 12a and the second joint portion 12b on the belt body 1 at a work site such as inside a tunnel. Therefore, the stretching operation of the conveyor belt 100 can be easily performed in a short time.

[0079] No. 1 Reference example As described above, the conveyor belt 100 is a tunnel conveyor belt that is installed and used inside a tunnel. This allows the (tensile) strength of the joint portions 12, 22 of the conveyor belt 100 to be improved even when the belt is extended by joining in a tunnel where a long conveyor belt 100 is required.

[0080] No. 1 Reference example As described above, the belt body 1 and the extension belt 2 are configured to be connected by a connecting member (common core material 3) in a state in which the teeth of the joint portion 12 of the belt body 1 and the teeth of the joint portion 22 of the extension belt 2 are engaged so as to alternately mesh with each other. This allows the tension acting on the joint portion 12 of the belt body 1 and the joint portion 22 of the extension belt 2 to be distributed in a balanced manner in the joint structure between the belt body 1 and the extension belt 2, thereby further improving the tensile strength of the conveyor belt 100.

[0081] No. 1 Reference example As described above, the connecting member includes the common core 3 that is passed through the joint portions 12 of the belt body 1 and the joint portions 22 of the stretched belt 2 that are engaged so that their comb teeth alternately mesh with each other. This makes it possible to easily connect the belt body 1 and the stretched belt 2 simply by passing the common core 3 through the joint portions 12 of the belt body 1 and the joint portions 22 of the stretched belt 2 that are arranged alternately in the longitudinal direction of the belt body 1 and the stretched belt 2, and also makes it possible to connect the belt body 1 and the stretched belt 2 with a simple configuration.

[0082] [2nd Reference example ] Next, referring to FIGS. 1, 6 and 7, the second embodiment of the present invention will be described. Reference example This second Reference example In the first embodiment, the joint portion 12 of the belt body 1 is directly formed by processing the core canvas layer 10, and the joint portion 22 of the stretched belt 2 is directly formed by processing the core canvas layer 20. Reference example Unlike the above, an example will be described in which the joint part 212 of the belt body 201 is a separate member from the core canvas layer 10, and the joint part 222 of the stretched belt 202 is a separate member from the core canvas layer 20. Reference example The same configuration is Reference example The same reference numerals are used in the drawings and the description thereof will be omitted.

[0083] The second embodiment shown in Figs. 1, 6 and 7 Reference exampleThe conveyor belt 200 includes a belt body 201 and an extension belt 202.

[0084] The belt body 201 has a joint portion 212. The joint portion 212 is formed from a separate member from the core canvas layer 10 and is directly (vulcanized) bonded to the core canvas layer 10. When unfolded, the joint portion 212 has a plurality of rectangular notches N arranged at equal intervals in the Y direction and positioned in the center in the X direction. The joint portion 212 is folded to form a ring portion R and is positioned in direct contact with both sides of the core canvas layer 10, sandwiching the core canvas layer 10. The joint portion 212 is covered by the core cover layer 11a and the core cover layer 11b.

[0085] The joint portion 212 is formed from the same material as the core canvas layer 10, or a material of the same quality as the core canvas layer 10 or a material of higher strength than the core canvas layer 10. Materials of the same quality as the core canvas layer 10 or a material of higher strength than the core canvas layer 10 include, for example, rayon, vinylon, nylon, or polyester, and are materials of the same strength as the core canvas layer 10 or a material of higher strength than the core canvas layer 10.

[0086] The stretching belt 202 has a joint portion 222. The joint portion 222 of the stretching belt 202 has the same configuration as the joint portion 212 of the belt body 201.

[0087] Here, a method for forming the joint portion 212 of the belt body 201 will be described.

[0088] First, as shown in FIG. 7A, a notch N (see FIG. 6) is formed in the joint portion 212, which is a separate member from the core canvas layer 10, and the joint portion 212 is folded. Next, as shown in FIG. 7B, the folded joint portion 212 directly sandwiches the longitudinal end of the core canvas layer 10. Next, as shown in FIG. 7C, the joint portion 212 and the core canvas layer 10 are sandwiched (vulcanized) between the core cover layers 11a and 11b and joined. Finally, the exposed joint portion is covered with the joint portion cover layer 4. Furthermore, when the joint portion of the belt body 201 and the joint portion of the stretched belt 202 are connected, the connection point may be covered with the outermost cover layer.

[0089] (2nd Reference example (Effect of No. 2 Reference example Then, the following effects can be obtained:

[0090] No. 2 Reference example As described above, the joints of the belt body 201 and the stretched belt 202 are formed from separate members from the core canvas layers 10, 20 and are directly bonded to the core canvas layers 10, 20. This increases the bonding strength between the joints 212, 222 and the core canvas layers 10, 20 compared to when the joints 212, 222, which are separate members from the core canvas layers 10, 20, are indirectly bonded to the core canvas layers 10, 20 via another layer.

[0091] No. 2 Reference example As described above, materials that are the same as or stronger than the core canvas layers 10, 20 include rayon, vinylon, nylon, or polyester. This allows the joint parts 212, 222 to be made of rayon, vinylon, nylon, or polyester, which are the same as or stronger than the core canvas layers 10, 20, and by changing the knitting method, number of core wires, etc., it is possible to form the joint parts 212, 222 with the same strength as or stronger than the core canvas layers 10, 20. As a result, it is possible to improve the (tensile) strength of the joint parts 212, 222 of the conveyor belt 200 even when the belt is stretched by adding additional parts.

[0092] [Third Reference example ] Next, referring to FIGS. 1, 8 and 9, the third embodiment of the present invention will be described. Reference example This third Reference example In the first (second) case, the core canvas layer 10 is a single-layer structure. Reference example Unlike the above, an example in which the core canvas layer 310 has a multi-layer structure will be described. Reference example The same configuration as the first (second) Reference example The same reference numerals are used in the drawings and the description thereof will be omitted.

[0093] The third embodiment shown in FIGS. 1, 8 and 9 Reference example The conveyor belt 300 includes a belt body 301 and an extension belt 302 .

[0094] The belt body 301 includes a core canvas layer 310. The core canvas layer 310 has a multi-layer structure. Specifically, the core canvas layer 310 has a three-layer structure including an upper canvas layer 310a, a central canvas layer 310b, and a lower canvas layer 310c.

[0095] The joint portion of the belt body 301 is Reference example The joint portion 212 has the same configuration as the joint portion 212.

[0096] The stretched belt 302 includes a core canvas layer 320. The core canvas layer 320 of the stretched belt 302 has the same three-layer structure as the core canvas layer 310 of the belt body 301.

[0097] Here, a method for forming the joint portion 212 of the belt body 301 will be described.

[0098] First, as shown in FIG. 9A, a slit N (see FIG. 8) is formed in the joint portion 212, which is a separate member from the core canvas layer 310, and the joint portion 212 is folded. Next, as shown in FIG. 9B, the folded joint portion 212 directly sandwiches the longitudinal end of the central canvas layer 310b. At this time, one end of the joint portion 212 in the X direction is directly sandwiched between the central canvas layer 310b and the upper canvas layer 310a. Furthermore, the other end of the joint portion 212 in the X direction is directly sandwiched between the central canvas layer 310b and the lower canvas layer 310c. Next, as shown in FIG. 9C, the joint portion 212 and the multilayered core canvas layer 310 are sandwiched (vulcanized) and joined by the core cover layers 11a and 11b. Finally, the exposed joint portion 212 is covered with the joint portion cover layer 4. Furthermore, after the joint portion of the belt body and the joint portion of the stretched belt are joined, the joint portion may be covered with the outermost cover layer.

[0099] (3rd Reference example (Effect of Third Reference example Then, the following effects can be obtained:

[0100] Third Reference example As described above, the core canvas layers 310, 320 of the belt body 301 and the stretched belt 302 each have a multi-layer structure, and the joint sections 212, 222 of the belt body 301 and the stretched belt 302 are sandwiched between the multi-layered core canvas layers 310, 320 and directly bonded to the core canvas layers 310, 320. By sandwiching the joint sections 212, 222 between the core canvas layers 310, 320, a large area can be secured for the joint sections 212, 222 and the core canvas layers 310, 320, thereby further increasing the bonding strength between the joint sections 212, 222 and the core canvas layers 310, 320.

[0101] [4th Reference example ] Next, referring to FIGS. 1, 10 and 11, the fourth embodiment of the present invention will be described. Reference example This fourth Reference example So, the above No. 1 Reference exampleIn addition to the above configuration, an example in which reinforcing members 401a and 402a are provided will be described. Reference example The same configuration as the first (third) Reference example The same reference numerals are used in the drawings and the description thereof will be omitted.

[0102] The fourth embodiment shown in FIGS. 1, 10 and 11 Reference example The conveyor belt 400 includes a belt body 401 and an extension belt 402 .

[0103] The belt body 401 is provided with a reinforcing member 401a.

[0104] The joint portion 412 is formed directly on the core canvas layer 310 by processing the central canvas layer 310b of the core canvas layer 310 (310a, 310b, 310c). Therefore, the joint portion 412 is formed in a planar shape using the same material as the core canvas layer 310. The reinforcing member 401a is configured to reinforce the joint portion 412. The reinforcing member 401a is made of canvas. The reinforcing member 401a is configured to cover the joint portion 412 from the outer periphery while directly abutting the joint portion 412 along the joint portion 412. The reinforcing member 401a is formed in the same shape as the joint portion 412.

[0105] The stretching belt 402 includes a reinforcing member 402a. The reinforcing member 402a of the stretching belt 402 has the same configuration as the reinforcing member 401a of the belt body 401.

[0106] Here, a method for forming the joint portion 412 of the belt body 401 will be described.

[0107] First, as shown in Figure 11A, the central canvas layer 310b is exposed (protruded), a notch N (see Figure 10) is formed in the joint portion 412, and the joint portion 412 is folded back. Next, as shown in Figure 11B, the folded back joint portion 412 is abutted against and joined to the central canvas layer 310b itself. At this time, the end face of the central canvas layer 310b abuts against the end face of the upper canvas layer 310a.

[0108] Next, as shown in FIG. 11C, reinforcing material 401a is placed along joint portion 412 so as to cover joint portion 412 from the outer periphery. At this time, reinforcing material 401a is directly abutted against joint portion 412. Reinforcing material 401a abuts almost the entire outer periphery of joint portion 412. Reinforcing material 401a has a long joining surface and is joined to upper canvas layer 310a and lower canvas layer 310c of core canvas layer 310, respectively. In other words, the tensile load of reinforcing material 401a is distributed and transmitted to upper canvas layer 310a and lower canvas layer 310c, rather than to central canvas layer 310b, thereby improving joint strength. Next, as shown in FIG. 11D, joint portion 412 and multilayered core canvas layer 310 are sandwiched between core cover layers 11a and 11b and then (vulcanized) joined. Finally, the exposed joint portion 412 is covered with the joint portion cover layer 4. Alternatively, after the joint portion of the belt main body and the joint portion of the stretched belt are joined, the joined portion may be covered with the outermost cover layer.

[0109] (4th Reference example (Effect of Fourth Reference example Then, the following effects can be obtained:

[0110] Fourth Reference example As described above, each of the belt body 401 and the extension belt 402 includes reinforcing members 401a and 402a arranged so as to cover the outer periphery of the joint portions 412 and 422 along the folded joint portions 412 and 422. This allows the connecting portions to have a multi-layer structure due to the reinforcing members 401a and 402a covering the outer periphery of the joint portions 412 and 422 along the joint portions 412 and 422, thereby further improving the (tensile) strength of the joint portions 412 and 422 of the conveyor belt 400.

[0111] [fruit Embodiment] Next, referring to FIGS. 12 to 15, fruit The embodiment will be described. fruit In this embodiment, the joint portions 12 of the belt body 1 and the joint portions 22 of the stretched belt 2 are alternately arranged in the widthwise direction (Y direction) of the belt body 1 and the stretched belt 2. Reference exampleUnlike the above configuration, an example will be described in which the joint portion 512 of the belt body 501 and the joint portion 522 of the stretched belt 502 face each other in the longitudinal direction (X direction) of the belt body 501 and the stretched belt 502. Reference example The same configuration is Reference example The same reference numerals are used in the drawings and the description thereof will be omitted.

[0112] As shown in Figures 12 and 13 Sumi The conveyor belt 500 of this embodiment includes a belt main body 501, an extension belt 502, a plurality of connecting fittings 5, a rod-shaped first core member 6, a rod-shaped second core member 7, and a retaining member P. The connecting fittings 5, the first core member 6, and the second core member 7 are examples of the "connecting member" in the claims.

[0113] (Belt body configuration) The belt body 501 includes a core canvas layer 10, core cover layers 11a and 11b, and a joint portion 512.

[0114] The joint portion 512 is formed in a comb-tooth shape. The connecting fitting 5 is placed in the gap portion CL (groove portion) of the comb-tooth shaped joint portion 512. The thickness (size in the Y direction) of the connecting fitting 5 is smaller than the width of the joint portion 512. In the short direction (Y direction) of the belt main body 501, the gap portion CL (groove portion) has approximately the same size as the connecting fitting 5. On the other hand, in the Y direction, Reference example The gap portion (groove portion) of the comb-tooth-shaped joint portion 12 has at least the first Reference example The joint portion 12 is larger than the joint portion 12 (see FIG. 4).

[0115] Therefore, in the Y direction ,fruit The clearance portion CL (groove portion) of the embodiment is Reference example That is, in the width direction (Y direction) of the belt body 501, the joint portion 512 is Reference example The joint portion 12 is provided over a larger area than the joint portion 12.

[0116] Here, a method for forming the joint portion 512 of the belt body 501 will be described with reference to FIG.

[0117] First, No. 1 Reference example 5A, a plurality of rectangular cuts (gap portions CL) are formed at equal intervals in the width direction (Y direction) of the belt body 501 at one end in the length direction (X direction) of the belt body 501. This state is shown in FIG.

[0118] Then, to change from the state shown in Figure 14A to the state shown in Figure 14B, the core cover layer 11a is peeled off at one end of the core canvas layer 10 in the longitudinal direction (X direction) to expose the core canvas layer 10 from the core cover layer 11a. At this time, the core cover layer 11b is not peeled off. Note that the process of forming the above-mentioned cut (gap portion CL) and the process of peeling off the core cover layer 11a may be reversed.

[0119] Next, as shown in Figure 14C, one longitudinal end of the core canvas layer 10 is folded back toward the core cover layer 11a, and the exposed core canvas layers 10 are brought into contact and joined. In this case, after joining, to prevent the core canvas layer 10 from remaining exposed, one longitudinal end of the core canvas layer 10 is folded back toward the core cover layer 11a so that the core cover layer 11b covers the entire exposed core canvas layer 10. As a result of the above, a ring-shaped joint portion 512 is formed at one longitudinal end of the core canvas layer 10.

[0120] Here, the core canvas layer 10 of the joint portion 512 is covered from the outer periphery by the core cover layer 11b. Reference example There is no need to provide a separate joint cover layer 4 (see FIG. 5) to cover the core canvas layer 10, such as the joint 12. Reference example As in the case of the joint 12, the process of providing the joint cover layer 4 can be omitted, and the working efficiency can be improved accordingly.

[0121] (Stretched belt configuration) 12, the stretched belt 502 includes a core canvas layer 20, core cover layers 21a and 21b, and a joint portion 522. The stretched belt 502 has the same connection structure as the belt body 501 already described, and therefore a description thereof will be omitted.

[0122] (Configuration of connecting fittings) The connecting fitting 5 is formed in a flat elliptical (oval) shape with its thickness direction aligned with the short side direction (Y direction) of the belt body 501. The connecting fitting 5 has a first hole 5a and a second hole 5b aligned in the longitudinal direction (X direction) of the belt body 501. The first hole 5a is a hole that passes through in the thickness direction (Y direction) and is a hole through which the first core material 6 is inserted. The second hole 5b is a through hole that passes through in the thickness direction (Y direction) and is a hole through which the second core material 7 is inserted. The first hole 5a and the second hole 5b are a pair of holes provided in the connecting fitting 5.

[0123] The first hole 5a is not a perfect circle, but is formed in an elliptical (oval) shape that matches the outer shape of the first core member 6 that is passed through it. The first hole 5a is configured to fit with the first core member 6 with a small gap between them. Therefore, the first hole 5a is configured to restrict the rotation of the first core member 6 that is passed through it relative to the connecting fitting 5. As a result, the first core member 6 is held in a state where a rotation center axis α, which will be described later, extends in the X direction.

[0124] The second hole 5b is not a perfect circle, but is formed in an elliptical (oval) shape that matches the outer shape of the second core member 7 that is passed through it. The second hole 5b is configured to fit with the second core member 7 with a small gap between them. Therefore, the second hole 5b is configured to restrict the rotation of the second core member 7 that is passed through it relative to the connecting fitting 5. As a result, the second core member 7 is held in a state where the rotation center axis α, which will be described later, extends in the X direction.

[0125] At least one connecting fitting 5 is arranged at one end 500a of the joint portion 512 of the belt main body 501 and the joint portion 522 of the stretched belt 502, and one at the other end 500b, in the short direction (Y direction) of the belt main body 501 and the stretched belt 502.

[0126] In addition, the connecting fittings 5 ​​are arranged not only at one end 500a and the other end 500b of the joint portion 512 of the belt main body 501 and the joint portion 522 of the stretched belt 502, but also in the gap portion CL (groove portion) of the comb-tooth-shaped joint portion 512 of the belt main body 501 and the comb-tooth-shaped joint portion 522 of the stretched belt 502.

[0127] (Configuration of the first core material and the second core material) The first core material 6 and the second core material 7 shown in FIGS. 12 and 15 have the same configuration, so the following will describe the first core material 6 in detail, and the second core material 7 briefly.

[0128] The first core material 6 is a member that is passed through the first holes 5a of the connecting fittings 5 ​​that are arranged alternately in the widthwise direction (Y direction) of the belt body 501, and through the joint parts 512 of the belt body 501.

[0129] The first core material 6 is divided into multiple parts in the widthwise direction (Y direction) of the belt body 501. Specifically, the first core material 6 is divided into three members, a first member 6a, a second member 6b, and a third member 6c, in the widthwise direction (Y direction) of the belt body 501.

[0130] A pivotal connection 60 is provided at the connection point between the first member 6a and the second member 6b, connecting the first member 6a and the second member 6b to be pivotable relative to each other. This pivotal connection 60 includes a pivot shaft 60a having a pivot center axis α extending in the longitudinal direction (X direction) of the belt main body 501. That is, the first member 6a and the second member 6b are connected to each other at the pivotal connection 60 so as to be bendable. Note that a pivotal connection 60 is also provided at the connection point between the second member 6b and the third member 6c.

[0131] The first core 6 is configured such that when the belt main body 501 through which the first core 6 is threaded is placed on a boat-shaped conveyor roller (not shown), the first core 6 itself is bent at the pivotal connection 60 to bend the belt main body 501, thereby positioning the belt main body 501 along the trough angle of the boat-shaped conveyor roller. Note that, without providing a pivotal connection, the first core may be made thin to make it easier to bend, thereby positioning the belt main body along the trough angle of the boat-shaped conveyor roller.

[0132] The second core material 7 is a member that is passed through the second hole portions 5b of the connecting fittings 5 ​​that are arranged alternately in the short direction (Y direction) of the stretched belt 502 and through the joint portions 522 of the stretched belt 502.

[0133] The second core 7 is divided into three members: a first member 7a, a second member 7b, and a third member 7c. A pivotal connection 70 including a pivot shaft 70a is provided at the connection between the first member 7a and the second member 7b and at the connection between the second member 7b and the third member 7c. The pivotal connection 70 of the second core 7 has the same configuration as the pivotal connection 60 of the first core 6 described above.

[0134] Through holes T for inserting anti-slip members P are provided near both ends of the first core material 6 and the second core material 7. The anti-slip members P are configured to elastically deform when inserted into the through holes T and maintain their engagement with the through holes T by utilizing the restoring force generated by the elastic deformation. The anti-slip members P are members for preventing the first core material 6 from falling off the belt main body 501 and the second core material 7 from falling off the stretched belt 502. The anti-slip members P are configured, for example, by snap pins.

[0135] By inserting the retaining member P into the through-hole T, the movement of the first core 6 in the Y direction relative to the belt main body 501 is restricted, and the movement of the second core 7 in the Y direction relative to the stretched belt 502 is restricted. As a result, the inserted state of the first core 6 through the first hole portion 5a and the joint portion 512 of the belt main body 501, and the inserted state of the second core 7 through the second hole portion 5b and the joint portion 522 of the stretched belt 502 are maintained.

[0136] (Procedure for connecting the belt body and extension belt) 12 and 13, the procedure for connecting the belt body 501 and the extension belt 502 will be described.

[0137] First, the belt body 501 and the stretched belt 502 are arranged so that the joint portion 512 of the belt body 501 and the joint portion 522 of the stretched belt 502 face each other in the longitudinal direction (X direction) of the belt body 501 and the stretched belt 502 .

[0138] Next, the connecting fittings 5 ​​are arranged at one end 500a and the other end 500b in the widthwise direction (Y direction) of the belt main body 501 and the stretched belt 502 and in the gap portion CL (groove portion).

[0139] Next, the first core material 6 is passed through the joint portion 512 of the belt main body 501 and the first hole portion 5a of the connecting fitting 5, and the second core material 7 is passed through the joint portion 522 of the stretched belt 502 and the second hole portion 5b of the connecting fitting 5, thereby connecting the belt main body 501 and the stretched belt 502.

[0140] Next, the retaining member P is attached to the first core material 6 and the second core material 7 to prevent the first core material 6 and the second core material 7 from falling off. The joint portion 512 of the connected belt main body 501 and the joint portion 522 of the extension belt 502 may be covered with an outermost cover layer (not shown) that covers the outer periphery.

[0141] (fruit Effect of the embodiment fruit In this embodiment, the following effects can be obtained.

[0142] fruit In this embodiment, as described above, the connecting member includes a connecting fitting 5 having a first hole portion 5a and a second hole portion 5b, a rod-shaped first core material 6 that is passed through the first hole portion 5a, and a rod-shaped second core material 7 that is passed through the second hole portion 5b, and the joint portion 512 of the belt main body 501 and the joint portion 522 of the stretched belt 502 are formed in a ring shape, and the belt main body 501 and the stretched belt 502 are configured to be connected by passing the first core material 6 through the joint portion 512 of the belt main body 501 and the first hole portion 5a of the connecting fitting 5, and passing the second core material 7 through the joint portion 522 of the stretched belt 502 and the second hole portion 5b of the connecting fitting 5, with the joint portion 512 of the belt main body 501 and the joint portion 522 of the stretched belt 502 facing each other in the longitudinal direction of the belt main body 501 and the stretched belt 502. This allows the connecting fitting 5, the first core 6, and the second core 7 to connect the joint portion 512 of the belt main body 501 and the joint portion 522 of the stretched belt 502 in a face-to-face state in the longitudinal direction of the belt main body 501 and the stretched belt 502. As a result, compared to a case in which the joint portions of the belt main body and the stretched belt are arranged to alternately mesh with each other in the short direction (width direction, i.e., Y direction) of the belt main body and the stretched belt, it is possible to increase the width of the joint portion 512 of the belt main body 501 and the width of the joint portion 522 of the stretched belt 502, and further increase the tensile strength of the joint portion 512 of the belt main body 501 and the joint portion 522 of the stretched belt 502.

[0143] In the embodiment, as described above, at least one connecting fitting 5 is disposed at one end 500a and one at the other end 500b of the joint portion 512 of the belt main body 501 and the joint portion 522 of the stretched belt 502 in the short direction of the belt main body 501 and the stretched belt 502. As a result, the connecting fitting 5, which is configured to receive the tension of the belt main body 501 and the stretched belt 502, is disposed so as to sandwich the joint portion 512 of the belt main body 501 and the joint portion 522 of the stretched belt 502 in the short direction of the belt main body 501 and the stretched belt 502, and therefore the connected state of the belt main body 501 and the stretched belt 502 can be stably maintained.

[0144] fruit In this embodiment, as described above, the joint portion 512 of the belt main body 501 and the joint portion 522 of the stretched belt 502 are formed in a comb-tooth shape when viewed in the thickness direction of the belt main body 501 and the stretched belt 502, and the connecting fittings 5 ​​are arranged not only at one end 500a and the other end 500b of the joint portion 512 of the belt main body 501 and the joint portion 522 of the stretched belt 502, but also in the gap portions CL between the comb-tooth-shaped joint portion 512 of the belt main body 501 and the comb-tooth-shaped joint portion 522 of the stretched belt 502. As a result, the connecting fittings 5 ​​are also arranged in the gap portions CL between the comb-tooth-shaped joint portion 512 of the belt main body 501 and the comb-tooth-shaped joint portion 522 of the stretched belt 502, so that the connected state of the belt main body 501 and the stretched belt 502 can be maintained more stably.

[0145] fruit As described above, the embodiment further includes retaining members P attached near the ends of the first core material 6 and the second core material 7 to prevent the first core material 6 and the second core material 7 from coming off the joints 512, 522. This prevents the first core material 6 and the second core material 7 from falling off, so the attached state of the first core material 6 and the second core material 7 can be stably maintained.

[0146] [Variations] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims rather than the description of the above embodiments, and further includes all modifications (variations) within the meaning and scope of the claims.

[0147] For example, the above items 1 to 4th Reference Example and In the embodiment, an example in which four annular portions (comb teeth) are provided on the joint portion has been shown, but the present invention is not limited to this. In the present invention, the joint portion may be provided with a number of annular portions (comb teeth) other than four (which may be either an even number or an odd number).

[0148] In addition, the above items 1 to 4th Reference Example and In the embodiment, an example has been shown in which the number of annular portions (comb teeth) of the first (third) joint part and the number of annular portions (comb teeth) of the second (fourth) joint part are the same, but the present invention is not limited to this. In the present invention, the number of annular portions (comb teeth) of the first (third) joint part and the number of annular portions (comb teeth) of the second (fourth) joint part may be different.

[0149] In addition, the above items 1 to 4th Reference Example and In the embodiment, an example has been shown in which the shapes of the multiple annular portions (comb teeth) of the first (second to fourth) joint part are the same, but the present invention is not limited to this. In the present invention, the shapes of the multiple annular portions (comb teeth) of the first (second to fourth) joint part may be different from one another.

[0150] In addition, the above 1st and 2nd Reference example Oh Bimi In this embodiment, the core canvas layer has a single layer structure, and the third and fourth Reference example Although an example in which the core canvas layer has a three-layer structure has been shown, the present invention is not limited to this. In the present invention, the core canvas layer may have a two-layer structure or a four-layer structure or more.

[0151] In addition, the above items 1 to Fourth Reference Example and In the embodiment, an example has been shown in which the belt main body is provided with only one set (connecting location) of the first joint portion and the second joint portion, but the present invention is not limited to this. In the present invention, the belt main body may be provided with multiple sets (connecting locations) of the first joint portion and the second joint portion.

[0152] In addition, the above items 1 to 4th Reference Example and In the embodiment, an example has been shown in which the annular portions (comb teeth) of the joint portion have the same shape, but the present invention is not limited to this. In the present invention, the annular portions (comb teeth) of the joint portion may have different shapes.

[0153] In addition, the above items 1 to Fourth Reference Example and In the embodiment, an example in which the conveyor belt is used in a tunnel has been described, but the present invention is not limited to this. In the present invention, the conveyor belt may be used in a factory or the like.

[0154] In addition, the above items 1 to 4th Reference Example and In the embodiment, an example in which a rectangular cut is provided to form the joint portion has been shown, but the present invention is not limited to this. In the present invention, a cut having a shape other than a rectangle, such as an oval, may be provided to form the joint portion. [Explanation of symbols]

[0155] 1, 201, 301, 401, 501 Belt body 2, 202, 302, 402, 502 Extension belt 3 Common core material (connecting member) 4 Joint cover layer 5 Connecting fittings (connecting members) 5a (Connecting metal fitting) first hole 5b (Connecting metal fitting) second hole 6 First core material (connecting member) 7 Second core material (connecting member) 10, 20, 310, 320 core canvas layer 11a, 11b, 21a, 21b Core-cover layer 12, 22, 212, 222, 412, 422, 512, 522 Joint 12a First joint 12b Second joint 22a Third joint 22b 4th joint 100, 200, 300, 400, 500 conveyor belt 401a, 402a Reinforcement 500a One end 500b Other end CL Gap area P retaining member

Claims

1. A conveyor belt comprising a belt body and an extension belt, the extension belt being capable of being extended by connecting the extension belt to the belt body, Each of the belt body and the stretching belt is a core canvas layer that reinforces the belt body and the stretched belt; A core cover layer that covers and protects the core canvas layer, The core canvas layer is provided with a planar joint portion arranged at the longitudinal end of the belt body and the stretched belt, and made of the same material as the core canvas layer or a material of the same quality as the core canvas layer or a material of higher strength than the core canvas layer; The belt main body and the extension belt are configured to be connected to each other by attaching a connecting member to the joint portion of each other, the connecting member includes a connecting fitting having a first hole portion and a second hole portion, a rod-shaped first core material that is passed through the first hole portion, and a rod-shaped second core material that is passed through the second hole portion; The joint portion of the belt main body and the joint portion of the extension belt are formed in an annular shape, A conveyor belt in which the belt body and the extension belt are connected by passing the first core material through the joint portion of the belt body and the first hole portion of the connecting fitting, and passing the second core material through the joint portion of the extension belt and the second hole portion of the connecting fitting, with the joint portion of the belt body and the extension belt facing each other in the longitudinal direction of the belt body and the extension belt.

2. The joint portions of the belt body and the stretched belt are formed into a ring shape when viewed from the short direction of each of the belt body and the stretched belt by folding back the end of the joint portion and joining it to the core canvas layer, 2. The conveyor belt according to claim 1, wherein the belt body and the extension belt are configured to be connected by passing the rod-shaped connecting member through the annular joint portion of the belt body and the joint portion of the extension belt.

3. 3. The conveyor belt according to claim 1, wherein the joint portions of the belt body and the extension belt are formed in a comb-tooth shape when viewed in a thickness direction of the belt body and the extension belt.

4. The conveyor belt according to any one of claims 1 to 3, wherein the joint portions of the belt body and the extension belt are formed directly on the core canvas layer by processing the core canvas layer itself.

5. The conveyor belt according to any one of claims 1 to 4, wherein the material having the same strength as the core canvas layer or a strength higher than that of the core canvas layer includes rayon, vinylon, nylon, or polyester.

6. The conveyor belt according to any one of claims 1 to 5, further comprising a joint portion cover layer that individually covers and protects each of the joint portion of the belt body and the joint portion of the extension belt.

7. The joint portion of the belt body is a first joint portion disposed at one end of the belt body in the longitudinal direction; a second joint portion that is arranged at the other end of the belt body in the longitudinal direction and that is connectable to the first joint portion, The joint portion of the stretched belt is a third joint portion arranged at one end of the stretched belt in the longitudinal direction and connectable to the first joint portion; The conveyor belt according to any one of claims 1 to 6, further comprising: a fourth joint portion arranged at the other end of the stretched belt in the longitudinal direction, the fourth joint portion being connectable to the second joint portion.

8. The conveyor belt according to any one of claims 1 to 7, which is a tunnel conveyor belt that is installed and used inside a tunnel.

9. 2. The conveyor belt according to claim 1, wherein the connecting fitting is arranged at least in the short direction of the belt body and the extension belt, at one end of the joint portion of the belt body and the joint portion of the extension belt, and at the other end of the joint portion of the belt body and the extension belt.

10. the joint portion of the belt main body and the joint portion of the extension belt are formed in a comb-tooth shape when viewed in a thickness direction of the belt main body and the extension belt, 10. The conveyor belt according to claim 9, wherein the connecting fittings are arranged not only at the one end and the other end of the joint portion of the belt main body and the joint portion of the extension belt, but also in gaps between the comb-tooth-shaped joint portion of the belt main body and the comb-tooth-shaped joint portion of the extension belt.

11. The conveyor belt according to any one of claims 1 to 10, further comprising anti-slip members attached near each end of the first core material and the second core material, which prevent the joint portion of the first core material and the second core material from slipping out of the joint portion.

12. A method for stretching a conveyor belt by connecting a stretching belt to a belt body, comprising: At the longitudinal ends of each of the belt body and the stretched belt, a planar and annular joint portion is provided on the core canvas layer that reinforces each of the belt body and the stretched belt, and the joint portion is made of the same material as the core canvas layer or a material of the same quality as the core canvas layer or a material with higher strength than the core canvas layer; and attaching a connecting member to each of the joint portions of the belt main body and the stretching belt, thereby connecting the stretching belt to the belt main body, thereby stretching the stretching belt. the connecting member includes a connecting fitting having a first hole portion and a second hole portion, a rod-shaped first core material that is passed through the first hole portion, and a rod-shaped second core material that is passed through the second hole portion; a first core material passing through the joint portion of the belt body and the first hole portion of the connecting fitting, and a second core material passing through the joint portion of the stretched belt and the second hole portion of the connecting fitting, with the joint portion of the belt body and the joint portion of the stretched belt facing each other in the longitudinal direction of the belt body and the stretched belt, thereby connecting the belt body and the stretched belt.

Images