JP2022129356A - Conveyor belt and extension method of conveyor belt - Google Patents

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

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conveyor belt and a conveyor belt stretching method, and more particularly to a conveyor belt and a conveyor belt stretching method in which the belt is spliced and stretched.

Conveyor belts and conveyor belt stretching methods are conventionally known in which belts are spliced and stretched (see, for example, Patent Document 1).

The above-mentioned Patent Document 1 discloses a conveyor belt that stretches by splicing the belt. The conveyor belt includes a reinforcing core layer made of canvas and a linear joint portion made of a wire embedded in the reinforcing core layer by bonding. Further, the stretched belt that is spliced onto the conveyor belt also includes a reinforcing core layer and a linear joint portion formed of a wire that is embedded in the reinforcing core layer by bonding. The conveyor belt and the stretched belt to be spliced are connected by attaching a common rod-shaped connecting member to the linear joint portion of each other.

Japanese Patent No. 3428498

However, in the conveyor belt described in Patent Literature 1, since the joint portion is linearly formed by the wire, when tension is applied to the conveyor belt, the linear joint portion and the reinforcing core layer are separated from each other. The force concentrates on the joints of the joints, and a large force acts. For this reason, there is a problem that the joining strength (tensile strength) of the joint portion against the tension of the conveyor belt may not be sufficiently ensured.

The present invention has been made to solve the above problems, and one object of the present invention is to improve the (tensile) strength of the joint portion even when the belt is spliced and stretched. To provide a conveyor belt and a method for stretching the conveyor belt.

To achieve the above object, a conveyor belt according to the present invention comprises a belt body and a stretching belt, and is a conveyor belt that can be stretched by connecting the stretching belt to the belt body. Each of the belts includes a core fabric layer that reinforces the belt body and the stretch belt, and a core cover layer that covers and protects the core fabric layer, wherein the core fabric layer includes the belt body and the stretch belt. A planar joint portion is provided at the end in the longitudinal direction of the belt and is made of the same material as the core canvas layer, the same quality as the core canvas layer, or a material higher in strength than the core canvas layer. The main body and the stretching belt are configured to be connected by attaching a connecting member to their joints.

In the conveyor belt of the present invention, as described above, the core fabric layer is arranged at the ends of the belt body and the stretching belt in the longitudinal direction, and is made of the same material as the core fabric layer, or is of the same quality as the core fabric layer, or has a core. A planar joint portion made of a material having a higher strength than the body canvas layer is provided, and the belt main body and the stretching belt are configured to be connected by attaching a connecting member to the mutual joint portion. As a result, since the joint portion is formed in a planar shape, the portion (boundary) where the joint portion and the core canvas layer are connected is relatively large compared to the conventional case where the joint portion is formed in a linear shape. can be secured to a large extent. As a result, it is possible to prevent the force from concentrating on the boundary between the joint portion and the core canvas layer as a reinforcing material, thereby preventing a large force from acting. In addition, by forming the joint portion from the same material as the core canvas layer, or from a material that is the same as the core canvas layer or has a higher strength than the core canvas layer, the joint portion has the same tensile strength as that of the core canvas layer. can be formed. As described above, the (tensile) strength of the joint portion of the conveyor belt can be improved even when the belt is spliced and stretched.

In the conveyor belt according to the above-described invention, preferably, the joint portion of each of the belt main body and the stretching belt is formed by folding back the ends of the joint portions and joining them to the core fabric layer so that each of the belt main body and the stretching belt is shortened. When viewed from the hand direction, the belt body and the stretching belt are formed in an annular shape, and the belt body and the stretching belt are configured to be coupled by passing a common coupling member through the annular joint portion of the belt body and the joint portion of the stretching belt. It is With this structure, the belt main body and the stretched belt can be easily connected by simply folding back the ends of the joint portion and joining them to the core canvas layer, and passing the common connecting member through the annularly formed joint portion. can be concatenated with In addition, since the joint portion is made of the same material as the core canvas layer, the same material as the core canvas layer, or a material with higher strength than the core canvas layer, the joint portion and the core canvas layer are firmly joined. can do.

In the conveyor belt according to the above invention, preferably, each joint portion of the belt main body and the stretching belt is formed in a comb-tooth shape when viewed from the thickness direction of the belt main body and the stretching belt. With this configuration, the tension acting on the joints can be dispersed in a well-balanced manner by the comb-toothed joints, so that the (tensile) strength of the joints of the conveyor belt can be further improved. In addition, it is possible to suppress relative positional deviation in the belt width direction between the joint portions of the connecting portions.

In the conveyor belt according to the above invention, preferably the joints of each of the belt body and the stretching belt are formed directly on the core fabric layer by processing the core fabric layer itself. With this configuration, the joint surface at the boundary between the core canvas layer and the joint portion can be reduced compared to the case where the core canvas layer and the joint portion are separate members.

In the conveyor belt according to the above-described invention, preferably, each joint portion of the belt main body and the stretching belt is formed of a member separate from the core canvas layer, and is directly joined to the core canvas layer. With this configuration, the joint portion and the core canvas layer are less likely to be bonded to the core canvas layer than in the case where the joint portion, which is a member separate from the core canvas layer, is indirectly joined via another layer. It is possible to increase the bonding strength with the layer.

In this case, the core canvas layers of each of the belt main body and the stretched belt preferably have a multi-layer structure, and the joint portions of each of the belt main body and the stretched belt are preferably sandwiched between the multi-layered core canvas layers. It is joined directly to the core canvas layer in the state of being held. With this configuration, by sandwiching the joint portion between the core fabric layers, a large area can be secured for the joint between the joint portion and the core fabric layer. Bonding strength can be further increased.

In the conveyor belt according to the above invention, preferably, the material that is the same as or stronger than the core fabric layer comprises rayon, vinylon, nylon, or polyester. With this configuration, the joint portion can be made of rayon, vinylon, nylon, or polyester, which is the same material as the core canvas layer or has a higher strength than the core canvas layer, and the knitting method, the number of core wires, etc. can be changed. Thus, the joint portion can be formed to have a strength equal to or higher than that of the core canvas layer. As a result, it is possible to improve the (tensile) strength of the joint portion of the conveyor belt even when the belt is spliced and stretched.

The conveyor belt according to the above invention preferably further comprises a joint cover layer that individually covers and protects the joint of the belt body and the joint of the stretching belt. According to this structure, the joint portion cover layer can suppress deterioration of the joint portion (connection portion) exposed from the core body cover layer due to abrasion caused by conveyed objects, adhesion of foreign matter, and the like.

In the configuration in which the joint portion is formed in an annular shape by folding back the ends of the joint portion and joining them to the core canvas layer, preferably, each of the belt main body and the stretched belt is jointed along the folded joint portion. It includes a reinforcing material arranged so as to cover the part from the outer peripheral side. According to this configuration, the connecting portion can be formed into a multi-layered structure by the reinforcing material covering the joint portion from the outer peripheral side along the joint portion, so that the (tensile) strength of the joint portion of the conveyor belt can be further improved. can be done.

In the conveyor belt according to the above invention, preferably, the joint portion of the belt body includes a first joint portion arranged at one end in the longitudinal direction of the belt body and a first joint portion arranged at the other end in the longitudinal direction of the belt body. a second joint portion connectable to the stretching belt, the joint portion of the stretching belt being arranged at one end in the longitudinal direction of the stretching belt, and a third joint portion connectable to the first joint portion; and a fourth joint portion disposed at the other end of the and connectable to the second joint portion. With this configuration, when the belt is stretched, the first joint portion and the second joint portion of the belt body are disconnected from the state in which the first joint portion and the second joint portion are connected, and the belt body is released. 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. . 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 save the trouble of forming the first joint portion and the second joint portion on the belt main body at a work site such as in a tunnel. can. Therefore, the operation of stretching the conveyor belt can be easily performed in a short time.

The conveyor belt according to the above invention is preferably a tunnel conveyor belt that is installed and used in a tunnel shaft. With this configuration, the (tensile) strength of the joint portion of the conveyor belt can be improved even when the belt is spliced and stretched in a tunnel tunnel where a long conveyor belt is required.

In the configuration in which the joint portions of the belt main body and the stretched belt are formed in a comb-teeth shape, preferably, in the belt main body and the stretched belt, the joint portions of the belt main body and the comb teeth of the joint portion of the stretched belt are alternately arranged. It is configured to be connected by a connecting member in a state of being engaged so as to mesh with. With this configuration, in the joint structure between the belt main body and the stretched belt, the tension acting on the joint portion of the belt main body and the joint portion of the stretched belt can be dispersed in a well-balanced manner. Strength can be further improved.

In this case, preferably, the connecting member includes a common core member that is passed through the joint portion of the belt body and the joint portion of the stretching belt that are engaged so that the comb teeth are alternately meshed. With this configuration, the belt main body and the stretched belt can be easily assembled simply by passing the common core material through the joints of the belt main body and the joints of the stretched belt, which are alternately arranged in the longitudinal direction of the belt main body and the stretched belt. It is possible to connect the belt main body and the stretching belt with a simple structure.

In the conveyor belt according to the above invention, preferably, the connecting member includes a connecting fitting having a first hole and a second hole, a rod-shaped first core member passed through the first hole, and a A rod-shaped second core material to be passed through, the joint portion of the belt body and the joint portion of the stretching belt are formed in an annular shape, and the belt body and the stretching belt are arranged in the longitudinal direction of the belt body and the stretching belt. With the joint portion and the joint portion of the stretched belt facing each other, the first core material is passed through the joint portion of the belt body and the first hole portion of the connecting fitting, and the joint portion of the stretched belt and the first hole portion of the connecting fitting are inserted. It is configured to be connected by passing the second core material through the two holes. According to this structure, the joint portion of the belt body and the joint portion of the stretched belt are connected in the longitudinal direction of the belt main body and the stretched belt by the connecting fitting, the first core member, and the second core member in a state of facing each other. can do. As a result, the width of the joint portion of the belt body is reduced compared to the case where the joint portion of the belt body and the joint portion of the stretched belt are alternately engaged in the lateral direction (width direction) of the belt body and the stretched belt. Also, the width of the joint portion of the stretched belt can be increased, and the tensile strength of the joint portion of the belt body and the joint portion of the stretched belt can be increased.

In this case, preferably, at least in the lateral direction of the belt body and the stretched belt, one connecting fitting is provided at one end of the joint portion of the belt body and the joint portion of the stretched belt, and one at the other end. are placed. With this configuration, the connecting fittings, which are configured to receive the tension of the belt main body and the stretched belt, are arranged so as to sandwich the joint portion of the belt main body and the joint portion of the stretched belt in the lateral direction of the belt main body and the stretched belt. Therefore, the connected state of the belt body and the stretching belt can be stably maintained.

In the configuration in which one connecting fitting is provided at each of one end and the other end of the joint portion of the belt main body and the stretched belt, preferably, the joint portion of the belt main body and the joint portion of the stretched belt are connected to the belt main body and the stretched belt. When viewed from the thickness direction, the connecting fitting is formed in a comb-like shape, and in addition to one end and the other end of the joint part of the belt body and the joint part of the stretched belt, the joint part of the belt body and the interstitial part of the comb-toothed joint of the stretching belt. With this configuration, the connecting metal fittings are also arranged in the gaps between the comb-toothed joint of the belt body and the comb-toothed joint of the stretched belt, so that the belt body and the stretched belt are connected more stably. can be retained.

In the configuration in which the connecting member includes a connecting fitting, a first core material, and a second core material, the first core material and the second core material are preferably attached near the ends of each of the first core material and the second core material. It further comprises a retaining member that prevents each of the two core members from coming off from the joint. With this configuration, the retaining member can prevent the first core material and the second core material from coming off, so that the attached state of the first core material and the second core material can be stably maintained. can be done.

A conveyor belt stretching method according to the present invention is a conveyor belt stretching method in which the stretching belt is stretched by connecting the stretching belt to a belt body, wherein the belt body and the stretching belt are stretched at longitudinal ends of each of the belt body and the stretching belt. A step of providing planar joints made of the same material as the core canvas layer, the same quality as the core canvas layer, or a material having higher strength than the core canvas layer on the core canvas layer that reinforces each of the belts. and a step of attaching connecting members to the joints of the belt main body and the stretched belt, and connecting the stretched belt to the belt main body for stretching.

In the conveyor belt stretching method of the present invention, as described above, at the longitudinal ends of each of the belt main body and the stretching belt, the core fabric layer for reinforcing the belt main body and the stretching belt is provided with a core fabric layer. A step of providing a planar joint portion made of the same material as the core canvas layer or a material of the same quality as the core canvas layer or having a higher strength than the core canvas layer; stretching by attaching and connecting the stretching belt to the belt body. As a result, since the joint portion is formed in a planar shape, the portion (boundary) where the joint portion and the core canvas layer are connected is relatively large compared to the conventional case where the joint portion is formed in a linear shape. can be secured to a large extent. As a result, it is possible to prevent the force from concentrating on the boundary between the joint portion and the core canvas layer as a reinforcing material, thereby preventing a large force from acting. In addition, by forming the joint portion from the same material as the core canvas layer, or from a material that is the same as the core canvas layer or has a higher strength than the core canvas layer, the joint portion has the same tensile strength as that of the core canvas layer. can be formed. As described above, it is possible to provide a conveyor belt stretching method capable of improving the (tensile) strength of the joint portion of the conveyor belt even when the belt is spliced and stretched.

According to the present invention, as described above, it is possible to provide a conveyor belt and a conveyor belt stretching method capable of improving the (tensile) strength of the joint portion even when the belt is stretched by replenishing the belt. .

1 is a schematic diagram showing an outline of a stretching conveyor provided with a conveyor belt according to a first (second to fourth) embodiment; FIG. FIG. 4 is a schematic diagram for explaining a procedure of a method of extending a stretched belt by adding a stretched belt to the belt body of the conveyor belt according to the first embodiment; 1 is an exploded perspective view of a conveyor belt according to a first embodiment; FIG. 1 is a plan view of a conveyor belt according to a first embodiment; FIG. It is a figure for demonstrating the procedure of the formation method of the joint part of the conveyor belt by 1st Embodiment. FIG. 5 is an exploded perspective view of a conveyor belt according to a second embodiment; It is a figure for demonstrating the procedure of the formation method of the joint part of the conveyor belt by 2nd Embodiment. FIG. 11 is an exploded perspective view of a conveyor belt according to a third embodiment; FIG. 10 is a diagram for explaining the procedure of a method for forming a joint portion of a conveyor belt according to the third embodiment; FIG. 11 is an exploded perspective view of a conveyor belt according to a fourth embodiment; It is a figure for demonstrating the procedure of the formation method of the joint part of the conveyor belt by 4th Embodiment. FIG. 11 is an exploded perspective view of a conveyor belt according to a fifth embodiment; FIG. 11 is a plan view of a conveyor belt according to a fifth embodiment; FIG. 10 is a diagram for explaining the procedure of a method for forming a joint portion of a conveyor belt according to the fifth embodiment; FIG. 12 is a side view of the first (2) core of the conveyor belt according to the fifth embodiment;

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

[First embodiment]
The configuration of the conveyor belt 100 according to the first embodiment will be described with reference to FIGS. 1 to 5. FIG. Conveyor belt 100 is a tunnel conveyor belt used in a tunnel pit. Conveyor belt 100 is one component of stretch conveyor C. As shown in FIG.

The extension conveyor C shown in FIG. 1 is a transport device for long excavation waste EM installed in a tunnel pit, and places the excavation waste EM generated during tunnel excavation on a conveyor belt 100 and conveys it to the vicinity of the tunnel pit. is configured as The excavation waste EM is rock masses, earth and sand excavated from the natural ground during tunnel excavation.

(Configuration of stretching conveyor)
The stretching conveyor C includes an annular conveyor belt 100 , a head pulley device 101 on the tunnel side, a tail pulley device 102 on the face (excavation surface) side, a belt storage device 103 , and a belt drive device 104 .

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

That is, the stretching conveyor C is a conveying system that conveys the excavated waste EM by means of 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 muck EM is collected by a transport vehicle H such as a wheel loader, crushed to a transportable size by a self-propelled crusher CR, and then loaded into the tail pulley device 102 .

Here, the head pulley device 101 (head pulley 101a) is fixedly installed near the wellhead. On the other hand, the tail pulley device 102 (tail pulley 102a) is configured to be movable, and advances into the depth of the tunnel as the face advances. The conveyor belt 100 is stretched as the tail pulley device 102 (tail pulley 102a) advances.

The belt storage device 103 is arranged between the head pulley device 101 and the tail pulley device 102 . A stretch margin (surplus length) portion secured in advance in the conveyor belt 100 is wound around a plurality of pairs of pulleys 103a and 103b and held. The belt storage device 103 winds and stores the conveyor belt 100 in a meandering manner using a plurality of pairs of pulleys 103a and 103b. The belt retractor 103 is configured to stretch the conveyor belt 100 by reducing the distance between the pair of pulleys 103a, 103b (bringing 103a and 103b closer together).

The belt driving device 104 is a driving 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. there is

(conveyor belt configuration)
The conveyor belt 100 shown in FIG. 1 is tensioned by a belt retractor 103 . In addition, the conveyor belt 100 is supported by a conveyor frame F with rollers between each device of the stretching conveyor C. As shown in FIG.

In addition to stretching by the belt storage device 103, the conveyor belt 100 (belt main body 1) is extended by a new belt (stretched belt 2) when the stretching of the conveyor belt 100 by the belt storage device 103 reaches the limit or approximately the limit. It is constructed so that it can be extended by replenishment (see FIG. 2).

Here, in FIGS. 3 to 5 (FIGS. 6 to 15 after the second embodiment) to which reference is made in the following description, the thickness direction of the conveyor belt 100 is indicated by the Z direction, and the longitudinal direction of the conveyor belt 100 is indicated by the X direction. , and the transverse direction (width direction) of the conveyor belt 100 is indicated by the Y direction.

The conveyor belt 100 shown in FIGS. 3 to 5 includes a belt body 1, a stretched belt 2, a rod-shaped common core member 3, and a joint cover that covers and protects the connecting portion between the belt body 1 and the stretched belt 2. layer 4; The belt main body 1 and the stretching belt 2 have the same connection structure. 3 (FIGS. 6, 8, and 10 after the second embodiment) show a simplified configuration by omitting illustration of the joint cover layer 4 for easy understanding. The common core member 3 is an example of a "connecting member" in the scope of claims.

As shown in FIG. 2A, only the belt body 1 is installed on the stretching conveyor C at the initial stage of the tunnel excavation work. 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).

Then, as shown in FIG. 2B, as the tunnel excavation work progresses, when the stretching by the belt storage device 103 reaches the limit (substantially the limit), that is, when the surplus portion of the belt body 1 becomes small, etc. , the coupling between the first joint portion 12a of the belt body 1 and the second joint portion 12b of the belt body 1 is released.

Then, as shown in FIG. 2C, the stretching belt 2 is spliced (connected) to the belt body 1 . At this time, the first joint portion 12a of the belt body 1 and the third joint portion 22a of the stretching belt 2 are connected. Further, the second joint portion 12b of the belt body 1 and the fourth joint portion 22b of the stretching belt 2 are connected.

(Composition of belt body)
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.

<Structure of the “core fabric layer” of the belt body>
The core canvas layer 10 is made of canvas. The core fabric 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 substantially 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.

<Structure of “core body cover layer” of 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 (Z1 direction) of the conveyor belt 100 in the thickness direction. The core cover layer 11b covers and protects the core canvas layer 10 from the other side (Z2 direction) of the conveyor belt 100 in the thickness direction. That is, the core canvas layer 10 is sandwiched between the core cover layer 11a and the core cover layer 11b. The core cover layer 11a and the core cover layer 11b are formed in the same rectangular shape.

As an example, the core cover layer 11a and the core cover layer 11b are vulcanized and bonded to the core cover layer 11a. The core cover layer 11a and the core cover layer 11b are directly vulcanized and bonded to each other on both sides of the conveyor belt 100 in the short direction (Y direction) without the core cover layer 11a interposed therebetween. In addition, sulfur is used for vulcanization bonding, and a superelastic material is formed by changing the rubber molecular structure by heating and pressurizing in vulcanization bonding and entangling the rubber molecules.

<Configuration of “first joint portion” and “second joint portion” of belt body>
The first joint portion 12a is arranged at one end of the belt body 1 in the longitudinal direction. The second joint portion 12b is arranged at the other end of the belt body 1 in the longitudinal direction. Since the second joint portion 12b has the same configuration as the first joint portion 12a, the first joint portion 12a will be mainly described below. The third joint portion 22a and the fourth joint portion 22b of the stretching belt 2 also have the same configuration as the first joint portion 12a.

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

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

First, as shown in FIG. 5A, one longitudinal end of the core canvas layer 10 is exposed from the core cover layers 11a and 11b. That is, one longitudinal end of the core canvas layer 10 is ensured to be longer than the core cover layers 11a and 11b. Then, a plurality of rectangular cuts N are formed at one end of the core canvas layer 10 in the longitudinal direction so as to be arranged at equal intervals in the lateral direction (Y direction).

Next, as shown in FIG. 5B, one end of the core canvas layer 10 in the longitudinal direction is folded back and sandwiched between the core cover layers 11a and 11b so that a plurality (four) of the core canvas layers 10 is provided at one end of the core canvas layer 10 in the longitudinal direction. to form an annular portion R of. The plurality (four) of annular portions R are arranged in one row in the lateral direction (Y direction). At this time, one surface of the folded core canvas layer 10 contacts the core canvas layer 10 itself, and the other surface of the folded core canvas layer 10 contacts the core cover layer 11a.

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. The first joint portion 12a is thus formed. The joint portion cover layer 4 covers and protects the exposed joint portions 12 (12a, 12b). After that, as shown in FIG. 5D , the formed first joint portion 12 a is connected to the third joint portion 22 a of the stretching belt 2 by the common core member 3 . Note that the first joint portion and the third joint portion that are connected may be covered with an outermost peripheral cover layer (not shown) that further covers the joint portion cover layer from the outer peripheral side.

As shown in FIG. 4 , the first joint portion 12 a has a plurality of cuts N and a plurality of annular portions R extending in the width direction (Y direction) of the belt body 1 when viewed from the thickness direction (Z direction) of the belt body 1 . are arranged alternately to form a comb-teeth shape.

The first joint portion 12a is configured to be connectable to the second joint portion 12b. Also, the first joint portion 12a is configured to be connectable to the third joint portion 22a of the stretching belt 2 instead of the second joint portion 12b.

Specifically, the first joint portion 12a and the second joint portion 12b are engaged with each other so that the comb teeth are alternately meshed (a state in which the annular portions R are arranged so as to be alternately arranged), and the common core member 3 are passed through the annular portion R to be connected. Similarly, the first joint portion 12a and the second joint portion 12b are connected by passing the common core member 3 through the annular portion R in a state where the comb teeth are alternately engaged with each other. is configured to When connected, the plurality of annular portions R of the first joint portion 12a and the plurality of annular portions R of the second joint portion 12b are alternately arranged with substantially no gap in the lateral direction (Y direction).

The first joint portion 12a and the second joint portion 12b are configured to be provided to the belt body 1 in advance at a factory or the like before starting the excavation work of the tunnel. That is, the first joint portion 12a and the second joint portion 12b are not configured to be provided to the belt body 1 during the excavation work of the tunnel. However, the first joint portion 12a and the second joint portion 12b may be provided on the belt body 1 afterward in the tunnel pit.

(Structure of stretching belt)
The stretching belt 2 shown in FIGS. 3 and 4 is configured to stretch the conveyor belt 100 by adding to the belt body 1 . As described above, the stretched belt 2 has a connection structure similar to that of the belt body 1 already described, so the stretched belt 2 will be briefly described below.

The stretching 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.

In order to extend the conveyor belt 100, the third joint portion 22a is configured to be connectable to the first joint portion 12a that is disconnected from the second joint portion 12b. Further, the fourth joint portion 22b is configured to be connectable to the second joint portion 12b, which is disconnected from the first joint portion 12a, in order to extend the conveyor belt 100. As shown in FIG.

The stretched belt 2 is manufactured in advance in a factory or the like before starting tunnel excavation work. That is, the stretched belt 2 is not manufactured inside the tunnel pit during the tunnel excavation work, but may be provided on the stretched belt 2 main body beforehand outside the tunnel pit or afterwards inside the pit.

(Structure of common core material)
The rod-shaped common core material 3 is formed in an elongated columnar shape or an elliptical (oval) columnar shape. The common core member 3 extends in the lateral direction of the conveyor belt 100 and is passed through the annular portion R of the first joint portion 12a and the annular portion R of the second joint portion 12b to It is configured to connect the joint portion 12b. The common core member 3 has retaining members at both ends so that it does not come off from the annular portion R.

The first joint portion 12a and the second joint portion 12b are made of canvas, and can be deformed into a shape along the outer shape of the common core member 3 when tension is applied to the conveyor belt 100. is. Therefore, the common core member 3 abuts on the first joint portion 12a and the second joint portion 12b by surface contact while being passed through the first joint portion 12a and the second joint portion 12b.

That is, the conveyor belt 100 locally exerts a larger force on the core canvas layer 10 than in the conventional case where belts are connected by linear joint members such as wires and metal fittings. can be avoided.

Further, the common core member 3 is configured to connect the first joint portion 12a and the third joint portion 22a. Further, the common core member 3 is configured to connect the second joint portion 12b and the fourth joint portion 22b.

(Structure of joint cover layer)
The joint cover layer 4 is made of rubber. The joint portion cover layer 4 forms a protective layer by covering the comb-like joint portions (12a, 22a) of the belt main body 1 and the stretching belt 2 when the joint portions (12a, 22a) are formed. In this case, the covering work of the joint cover layer 4 can be omitted in the stretching work in the tunnel. Further, the outermost peripheral cover layer may be configured to cover and protect the joint portion and the connecting member where the belt body and the stretched belt are connected. In this case, it is necessary to coat the outermost peripheral cover layer during the work of extending the inside of the tunnel. This outermost cover layer is removed when disconnecting the first joint portion and the second joint portion. The outermost peripheral cover layer is made of the same material as the joint cover layer, for example.

(Conveyor belt stretching method)
Next, a method for stretching the conveyor belt 100 (belt body 1) will be described.

First, the joint 12 is provided in advance on the core fabric layer 10 of the belt body 1 at the factory, as described in the above "method for forming the first joint 12a" with reference to FIG. Similarly, a joint portion 22 is provided on the core fabric layer 10 of the stretching belt 2 . Then, the first joint portion 12a and the second joint portion 12b are connected to form the belt body 1 in a loop (see FIG. 2A).

Next, as shown in FIG. 2B, when the conveyor belt 100 needs to be stretched by replenishment, the first joint portion 12a and the second joint portion 12b of the belt body 1 are disconnected. At this time, if an outermost peripheral cover layer has been applied, it is necessary to remove the outermost peripheral cover layer that covers the first joint portion and the second joint portion. After that, the common core member 3 passed through the first joint portion 12a and the second joint portion 12b is pulled out. Then, the first joint portion 12a and the second joint portion 12b are separated.

Next, as shown in FIG. 2C, the first joint portion 12a of the belt body 1 and the third joint portion 22a of the stretching belt 2 are connected by the common core member 3. As shown in FIG. Further, the second joint portion 12b of the belt body 1 and the fourth joint portion 22b of the stretching belt 2 are connected by the common core member 3. As shown in FIG. The conveyor belt 100 (belt body 1) is thus stretched.

(Effect of the first embodiment)
The following effects can be obtained in the first embodiment.

In the first embodiment, as described above, the core fabric layers 10, 20 are provided with the same material or core as the core fabric layers 10, 20, which are arranged at the longitudinal ends of the belt body 1 and stretching belt 2. Planar joint portions 12 and 22 made of the same material as the body canvas layers 10 and 20 or having a higher strength than the core canvas layers 10 and 20 are provided, and the belt main body 1 and the stretching belt 2 are connected to each other at the joint portions. By attaching a common connecting member (common core member 3) to 12 and 22, they are configured to be connected. As a result, the joint portions 12 and 22 are formed in a planar shape, so that the joint portions 12 and 22 and the core canvas layers 10 and 20 are separated from each other in comparison with the conventional case where the joint portions are formed in a linear shape. It is possible to secure a relatively large portion (boundary) where the two are connected. As a result, it is possible to prevent the force from concentrating on the boundaries between the joint portions 12, 22 and the core canvas layers 10, 20 as reinforcing materials, thereby preventing a large force from acting. In addition, by configuring the joint portions 12 and 22 from the same material as the core canvas layers 10 and 20, the same material as the core canvas layers 10 and 20, or a material having higher strength than the core canvas layers 10 and 20, the joint The portions 12 and 22 can be formed to have the same tensile strength as the core fabric layers 10 and 20 . As described above, the (tensile) strength of the joint portions 12 and 22 of the conveyor belt 100 can be improved even when the belt is spliced and stretched.

In the first embodiment, as described above, the joint portions 12 and 22 of the belt main body 1 and the stretching belt 2 are formed by folding back the ends of the joint portions 12 and 22 to attach (apply to) the core canvas layers 10 and 20. (2) By joining, the belt body 1 and the stretched belt 2 are formed in an annular shape when viewed from the lateral direction of each, and the belt body 1 and the stretched belt 2 are connected to the annular joint portion 12 of the belt body 1, and A common connecting member (common core member 3) is passed through the joint portion 22 of the stretching belt 2 to connect them. As a result, the ends of the joint portions 12 and 22 are folded back and (vulcanized) joined to the core canvas layers 10 and 20, and a connecting member (common core member) common to the annular joint portions 12 and 22 is formed. The belt main body 1 and the stretching belt 2 can be easily connected simply by passing through 3). In addition, since the joint portions 12 and 22 are made of the same material as the core canvas layers 10 and 20, the same material as the core canvas layers 10 and 20, or a higher strength material than the core canvas layers 10 and 20, The joint portions 12, 22 and the core canvas layers 10, 20 can be firmly bonded (by vulcanization bonding).

In the first embodiment, as described above, the joint portions 12 and 22 of the belt main body 1 and the stretched belt 2 are formed in a comb shape when viewed from the thickness direction of the belt main body 1 and the stretched belt 2. . As a result, the comb-toothed joints 12, 22 can disperse the tension acting on the joints 12, 22 in a well-balanced manner. can be improved. In addition, it is possible to suppress relative positional deviation in the belt width direction between the joint portions 12 and 22 at the connection points.

In the first embodiment, as described above, the joint portions 12 and 22 of the belt body 1 and the stretching belt 2 are formed directly on the core canvas layers 10 and 20 by processing the core canvas layers 10 and 20 themselves. It is As a result, compared to the case where the core fabric layers 10, 20 and the joint parts 12, 22 are separate members, the joint surfaces at the boundaries between the core fabric layers 10, 20 and the joint parts 12, 22 are reduced. be able to.

In the first embodiment, as described above, the 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 stretching belt 2 is further provided. This prevents the joint portions 12 and 22 (connecting portions) exposed from the core body cover layers 11a, 11b, 21a, and 21b from deteriorating due to abrasion caused by conveyed objects, adhesion of foreign matter, and the like. can be suppressed.

In the first embodiment, as described above, the joint portion 12 of the belt body 1 is arranged at the first joint portion 12a arranged at one end in the longitudinal direction of the belt body 1 and at the other end in the longitudinal direction of the belt body 1 . and a second joint portion 12b connectable to the first joint portion 12a, and the joint portion 22 of the stretching belt 2 is disposed at one longitudinal end of the stretching belt 2 and is connectable to the first joint portion 12a. and a fourth joint portion 22b arranged at the other end in the longitudinal direction of the stretching belt 2 and connectable to the second joint portion 12b. As a result, when the belt is stretched, the first joint portion 12a and the second joint portion 12b of the belt body 1 are disconnected from the state in which the first joint portion 12a and the second joint portion 12b are connected, and the belt is stretched. A state in which the first joint portion 12a of the main body 1 and the third joint portion 22a of the stretching belt 2 are connected, and the second joint portion 12b of the belt main body 1 and the fourth joint portion 22b of the stretching belt 2 are connected. , can be easily changed. That is, since the belt main body 1 is provided with the first joint portion 12a and the second joint portion 12b in advance, the first joint portion 12a and the second joint portion 12b are formed on the belt main body 1 at a work site such as a tunnel tunnel. can save you the trouble of doing it. Therefore, the operation of stretching the conveyor belt 100 can be easily performed in a short time.

In 1st Embodiment, as mentioned above, the conveyor belt 100 is a conveyor belt for tunnels installed and used in a tunnel pit. As a result, the (tensile) strength of the joints 12 and 22 of the conveyor belt 100 can be improved even when the belt is spliced and stretched in a tunnel tunnel where a long conveyor belt 100 is required.

In the first embodiment, as described above, the belt body 1 and the stretched belt 2 are engaged so that the comb teeth of the joint portion 12 of the belt body 1 and the joint portion 22 of the stretched belt 2 are alternately meshed. It is configured to be connected by a connecting member (common core material 3) in a state. As a result, in the joint structure between the belt body 1 and the stretched belt 2, the tension acting on the joint portion 12 of the belt body 1 and the joint portion 22 of the stretched belt 2 can be dispersed in a well-balanced manner. The tensile strength of 100 can be further improved.

In the first embodiment, as described above, the connecting member is the common core member 3 passed through the joint portion 12 of the belt body 1 and the joint portion 22 of the stretching belt 2, which are engaged so that the comb teeth are alternately meshed. including. As a result, the belt body 1 and the stretched belt 2 can be stretched by simply passing the common core material 3 through the joints 12 of the belt body 1 and the joints 22 of the stretched belt 2 that are alternately arranged in the longitudinal direction of the belt body 1 and the stretched belt 2 . The belt 2 can be easily connected, and the belt body 1 and the stretching belt 2 can be connected with a simple configuration.

[Second embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. 1, 6 and 7. FIG. In this second 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 stretching belt 2 is directly formed by processing the core canvas layer 20. An example in which the joint portion 212 of the belt main body 201 is formed as a separate member from the core canvas layer 10 and the joint portion 222 of the stretching belt 202 is formed as a separate member from the core canvas layer 20 will be described. . In addition, the structure similar to the said 1st Embodiment attaches|subjects the same code|symbol as 1st Embodiment, and abbreviate|omits description while it is illustrated.

A conveyor belt 200 of the second embodiment shown in FIGS.

The belt body 201 has a joint portion 212 . The joint portion 212 is formed of a member separate from the core canvas layer 10 and is directly (vulcanized) joined to the core canvas layer 10 . A plurality of rectangular cuts N are formed in the joint portion 212 in an unfolded state, arranged in the center in the X direction and arranged at regular intervals in the Y direction. The joint portions 212 are arranged so as to sandwich the core canvas layer 10 in a state of being bent so as to form the annular portion R, and in direct contact with both surfaces of the core canvas layer 10 . ing. The joint portion 212 is covered with the core cover layer 11a and the core cover layer 11b.

The joint portion 212 is formed of the same material as the core canvas layer 10 , the same quality as the core canvas layer 10 , or a material having a higher strength than the core canvas layer 10 . The material of the same quality as the core canvas layer 10 or having higher strength than the core canvas layer 10 is, for example, rayon, vinylon, nylon, polyester, etc., and has the same strength as the core canvas layer 10 or the core canvas. It is a stronger material than layer 10 .

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 .

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

First, as shown in FIG. 7A, a cut 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 bent. Next, as shown in FIG. 7B, the longitudinal end portions of the core canvas layer 10 are directly sandwiched between the bent joint portions 212 . Next, as shown in FIG. 7C, the joint portion 212 and the core canvas layer 10 are sandwiched (vulcanized) and joined between the core cover layers 11a and 11b. Finally, the exposed joint portion is covered with the joint portion cover layer 4 . Further, in a state in which the joint portion of the belt body 201 and the joint portion of the stretching belt 202 are connected, the joint portion may be covered with the outermost peripheral cover layer.

(Effect of Second Embodiment)
The following effects can be obtained in the second embodiment.

In the second embodiment, as described above, the joint portions of the belt main body 201 and the stretching belt 202 are formed of members separate from the core canvas layers 10 and 20, and are directly joined to the core canvas layers 10 and 20. It is As a result, the joint portions 212 and 222, which are members separate from the core fabric layers 10 and 20, and the core fabric layers 10 and 20 are indirectly joined via other layers, the joint The bonding strength between the portions 212, 222 and the core canvas layers 10, 20 can be increased.

In the second embodiment, as described above, the material that is the same as or stronger than the core canvas layers 10, 20 includes rayon, vinylon, nylon, or polyester. As a result, the joints 212 and 222 are made of rayon, vinylon, nylon, or polyester, which is the same material as the core canvas layers 10 and 20 or has a higher strength than the core canvas layers 10 and 20. By changing the number and the like, the joint portions 212 and 222 can be formed to have strength equal to or higher than that of the core canvas layers 10 and 20 . As a result, it is possible to improve the (tensile) strength of the joint portions 212 and 222 of the conveyor belt 200 even when the belt is spliced and stretched.

[Third embodiment]
Next, a third embodiment of the present invention will be described with reference to FIGS. 1, 8 and 9. FIG. In this third embodiment, unlike the first (second) embodiment in which the core canvas layer 10 has a single layer structure, an example in which the core canvas layer 310 has a multi-layer structure will be described. In addition, the structure similar to the said 1st (2nd) embodiment attaches|subjects the same code|symbol as the 1st (2nd) embodiment, and it abbreviate|omits description while attaching|subjecting and illustrating.

Conveyor belt 300 of the third embodiment shown in FIGS.

The belt body 301 has a core fabric layer 310 . The core canvas layer 310 has a multilayer 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.

The joint portion of the belt body 301 has the same configuration as the joint portion 212 of the second embodiment.

Stretch belt 302 includes a core fabric layer 320 . The core fabric layer 320 of the stretching belt 302 has the same three-layer structure as the core fabric layer 310 of the belt body 301 .

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

First, as shown in FIG. 9A, a cut 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 bent. Next, as shown in FIG. 9B, the bent joints 212 directly sandwich the longitudinal ends 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. Also, 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 core canvas layer 310 having a multi-layer structure are sandwiched (vulcanized) and joined between the core cover layers 11a and 11b. Finally, the exposed joint portion 212 is covered with the joint portion cover layer 4 . Further, after connecting the joint portion of the belt body and the joint portion of the stretched belt, the joint portion may be covered with the outermost peripheral cover layer.

(Effect of the third embodiment)
The following effects can be obtained in the third embodiment.

In the third embodiment, as described above, the core canvas layers 310 and 320 of the belt main body 301 and the stretching belt 302 have a multi-layer structure, and the joint portions of the belt main body 301 and the stretching belt 302 212 and 222 are directly joined to the core fabric layers 310 and 320 while being sandwiched between the core fabric layers 310 and 320 having a multilayer structure. As a result, by sandwiching the joint portions 212 and 222 between the core canvas layers 310 and 320, it is possible to ensure a large joint area between the joint portions 212 and 222 and the core canvas layers 310 and 320. The bonding strength between the portions 212, 222 and the core fabric layers 310, 320 can be further increased.

[Fourth embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIGS. 1, 10 and 11. FIG. In this fourth embodiment, in addition to the configuration of the first embodiment, an example in which reinforcing members 401a and 402a are provided will be described. In addition, the structure similar to the said 1st (3rd) embodiment attaches|subjects the same code|symbol as the 1st (3rd) embodiment, and it abbreviate|omits description while attaching|subjecting and illustrating.

The conveyor belt 400 of the fourth embodiment shown in FIGS. 1, 10 and 11 comprises a belt body 401 and a stretching belt 402.

The belt body 401 has a reinforcing member 401a.

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 made of the same material as the core canvas layer 310 and is formed in a planar shape. The reinforcing material 401 a is a structure for reinforcing the joint portion 412 . The reinforcing member 401a is made of canvas. The reinforcement member 401a is configured to cover the joint portion 412 from the outer peripheral side while being in direct contact with the joint portion 412 along the joint portion 412 . In addition, the reinforcing member 401 a is formed in the same shape as the joint portion 412 .

Stretching belt 402 includes reinforcing material 402a. The reinforcing member 402a of the stretching belt 402 has the same structure as the reinforcing member 401a of the belt body 401. As shown in FIG.

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

First, as shown in FIG. 11A, the central canvas layer 310b is exposed (protruded), a cut N (see FIG. 10) is formed in the joint portion 412, and the joint portion 412 is folded back. Next, as shown in FIG. 11B, the folded joint portion 412 is brought into contact with and joined to the center canvas layer 310b itself. At this time, the end surface of the central canvas layer 310b contacts the end surface of the upper canvas layer 310a.

Next, as shown in FIG. 11C , a reinforcing member 401a is arranged along the joint portion 412 so as to cover the joint portion 412 from the outer peripheral side. At this time, the reinforcing member 401 a is brought into direct contact with the joint portion 412 . In addition, the reinforcing member 401 a contacts substantially the entire outer peripheral surface of the joint portion 412 . The reinforcing member 401a has a long joint surface and is joined to the upper canvas layer 310a and the lower canvas layer 310c of the core canvas layer 310, respectively. The strength of the joint is improved by dispersing and transmitting to the canvas layer 310a and the lower canvas layer 310c. Next, as shown in FIG. 11D, the joint portion 412 and the core fabric layer 310 having a multi-layer structure are sandwiched between the core cover layers 11a and 11b and joined (vulcanized). Finally, the exposed joint portion 412 is covered with the joint portion cover layer 4 . Further, after connecting the joint portion of the belt body and the joint portion of the stretched belt, the joint portion may be covered with the outermost peripheral cover layer.

(Effect of the fourth embodiment)
The following effects can be obtained in the fourth embodiment.

In the fourth embodiment, as described above, each of the belt main body 401 and the stretched belt 402 has a reinforcing member arranged along the folded joint portions 412 and 422 so as to cover the joint portions 412 and 422 from the outer peripheral side. 401a, 402a. As a result, the joint portions 412 and 422 of the conveyor belt 400 can be formed into a multi-layered structure by the reinforcing members 401a and 402a that cover the joint portions 412 and 422 from the outer peripheral side along the joint portions 412 and 422. (Tensile) strength can be further improved.

[Fifth embodiment]
Next, a fifth embodiment of the present invention will be described with reference to FIGS. 12 to 15. FIG. In the fifth 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 lateral direction (Y direction) of the belt body 1 and the stretched belt 2. An example in which the joint portion 512 of the belt main body 501 and the joint portion 522 of the stretched belt 502 face each other in the longitudinal direction (X direction) of the belt main body 501 and the stretched belt 502 will be described. In addition, the structure similar to the said 1st Embodiment attaches|subjects the same code|symbol as 1st Embodiment, and abbreviate|omits description while it is illustrated.

A conveyor belt 500 of the fifth embodiment shown in FIGS. 12 and 13 includes a belt body 501, a stretching belt 502, a plurality of connecting fittings 5, a rod-shaped first core member 6, and a rod-shaped second core member 7. and a retaining member P. The connecting fitting 5, the first core member 6 and the second core member 7 are examples of the "connecting member" in the scope of claims.

(Composition of belt body)
The belt body 501 includes a core canvas layer 10 , core cover layers 11 a and 11 b , and a joint portion 512 .

The joint portion 512 is formed in a comb-teeth shape. The connecting fitting 5 is arranged in the gap portion CL (groove portion) of the joint portion 512 having a comb-tooth shape. The thickness (size in the Y direction) of the connecting fitting 5 is smaller than the width of the joint portion 512 . In the lateral direction (Y direction) of the belt body 501 , the clearance CL (groove portion) has approximately the same size as the connecting fitting 5 . On the other hand, in the Y direction, the interstices (groove portions) of the comb tooth-shaped joint portion 12 of the first embodiment are at least larger than those of the joint portion 12 of the first embodiment (see FIG. 4).

Therefore, in the Y direction, the gap portion CL (groove portion) of the fifth embodiment is smaller than the gap portion (groove portion) of the comb-teeth joint portion 12 of the first embodiment. That is, in the lateral direction (Y direction) of the belt body 501, the joint portion 512 is provided in a larger range than the joint portion 12 of the first embodiment.

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

First, as shown in FIG. 5A of the first embodiment, a plurality of rectangular cuts ( A gap portion CL) is formed. This state is assumed to be the state shown in FIG. 14A.

14A to the state shown in FIG. 14B, the core cover layer 11a is peeled off at one end in the longitudinal direction (X direction) of the core canvas layer 10, and the core canvas layer 10 is separated from the core body. It is exposed from the cover layer 11a. At this time, the core body cover layer 11b is not peeled off. Note that the step of forming the cut (clearance portion CL) and the step of peeling off the core cover layer 11a may be reversed.

Next, as shown in FIG. 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 with each other and joined. In this case, one end of the core canvas layer 10 in the longitudinal direction is formed so that the core cover layer 11b covers the entire exposed core canvas layer 10 so that the core canvas layer 10 does not remain exposed after joining. is folded back toward the core cover layer 11a. As a result, an annular joint portion 512 is formed at one longitudinal end of the core canvas layer 10 .

Here, since the core canvas layer 10 of the joint portion 512 is covered from the outer peripheral side by the core cover layer 11b, the joint portion cover layer 4 that covers the core canvas layer 10 like the joint portion 12 of the first embodiment. (see FIG. 5) need not be provided separately. Therefore, the belt main body 501 can improve the work efficiency by eliminating the process of providing the joint portion cover layer 4 as in the joint portion 12 of the first embodiment.

(Structure of stretching belt)
As shown in FIG. 12, the stretching belt 502 includes a core canvas layer 20, core cover layers 21a and 21b, and a joint portion 522. As shown in FIG. The stretching belt 502 has a connection structure similar to that of the belt main body 501 already described, so the description thereof will be omitted.

(Construction of connecting fittings)
The connecting fitting 5 is formed in a plate-like elliptical (elliptical) shape whose thickness direction is the lateral direction (Y direction) of the belt body 501 . The connecting fitting 5 has a first hole 5a and a second hole 5b arranged in the longitudinal direction (X direction) of the belt body 501 . The first hole portion 5a is a hole penetrating in the thickness direction (Y direction) and through which the first core member 6 is passed. The second hole portion 5b is a through hole penetrating in the thickness direction (Y direction), and is a hole through which the second core material 7 is passed. The first hole portion 5 a and the second hole portion 5 b are a pair of structures provided in the connecting fitting 5 .

The first hole portion 5a is not formed in a perfect circular shape, but in an elliptical shape (elliptical shape) matching the outer shape of the first core material 6 that is passed inside. The first hole portion 5a is configured to be fitted with the first core member 6 with a small gap therebetween. Therefore, the first hole portion 5 a is configured to restrict the rotation of the first core member 6 with respect to the connecting fitting 5 . As a result, the first core member 6 is held in a state in which the rotation center axis α, which will be described later, extends in the X direction.

The second hole portion 5b is not formed in a perfect circular shape, but in an elliptical shape (elliptic shape) matching the outer shape of the second core member 7 that is passed inside. The second hole portion 5b is configured to fit with the second core member 7 with a small gap therebetween. Therefore, the second hole portion 5 b is configured to restrict the rotation of the second core member 7 with respect to the connecting fitting 5 . As a result, the second core member 7 is held in a state in which the rotation center axis α, which will be described later, extends in the X direction.

One connecting fitting 5 is provided at least at one end 500a of the joint portion 512 of the belt body 501 and the joint portion 522 of the stretching belt 502 in the lateral direction (Y direction) of the belt body 501 and the stretching belt 502, and One is arranged at the other end 500b.

In addition to the one end portion 500a and the other end portion 500b of the joint portion 512 of the belt body 501 and the joint portion 522 of the stretching belt 502, the connecting fitting 5 includes the comb-shaped joint portion 512 of the belt body 501 and the stretching belt. It is also arranged in the clearance part CL (groove part) of the joint part 522 of comb tooth shape of 502 .

(Configuration of first core material and second core material)
Since the first core material 6 and the second core material 7 shown in FIGS. 12 and 15 have the same configuration, the first core material 6 will be described in detail below, and the second core material 7 will be briefly described. to explain.

The first core member 6 is a member passed through the first holes 5a of the connecting fittings 5 alternately arranged in the lateral direction (Y direction) of the belt body 501 and the joint portion 512 of the belt body 501. .

In the lateral direction (Y direction) of the belt body 501, the first core member 6 is divided into a plurality of pieces. Specifically, in the lateral direction (Y direction) of the belt main body 501, the first core member 6 is divided into three members: a first member 6a, a second member 6b, and a third member 6c. there is

A rotary connection portion 60 that rotatably connects the first member 6a and the second member 6b to each other is provided at the connection point between the first member 6a and the second member 6b. The rotary connecting portion 60 includes a rotary shaft 60a having a rotary center axis line α extending in the longitudinal direction (X direction) of the belt body 501. As shown in FIG. That is, the first member 6a and the second member 6b are connected to each other at the rotary connection portion 60 so as to be bendable. A rotary connecting portion 60 is also provided at the connecting portion between the second member 6b and the third member 6c.

When the belt body 501 through which the first core member 6 is passed is placed on a boat-shaped conveyor roller (not shown), the first core member 6 is rotated by the rotary connection portion 60 . By bending the first core member 6 itself to bend the belt body 501, the belt body 501 is arranged along the trough angle of the boat-shaped conveyor roller. By forming the first core material thin without providing the rotary connection portion, the first core material is made easy to bend, and the belt body is arranged along the trough angle of the boat-shaped conveyor roller. good too.

The second core member 7 is a member passed through the second hole portions 5b of the connecting fittings 5 alternately arranged in the lateral direction (Y direction) of the stretching belt 502 and the joint portion 522 of the stretching belt 502. .

The second core member 7 is divided into three members, a first member 7a, a second member 7b, and a third member 7c. Rotating connecting portions 70 including rotating shafts 70a are provided at the connecting portion between the first member 7a and the second member 7b and the connecting portion between the second member 7b and the third member 7c. The rotary connection portion 70 of the second core member 7 has the same configuration as the rotary connection portion 60 of the first core member 6 described above.

Through holes T for inserting retaining members P are provided in the vicinity of both end portions of the first core member 6 and the second core member 7 . The retaining member P is configured to elastically deform when inserted into the through hole T, and to maintain the state of engagement with the through hole T by utilizing the restoring force generated by the elastic deformation. The retaining member P is a member for preventing the first core material 6 from falling off from the belt body 501 and the second core material 7 from falling off from the stretching belt 502 . The retaining member P is composed of, for example, a snap pin.

By inserting the retaining member P into the through hole T, the first core material 6 is restricted from moving in the Y direction with respect to the belt body 501, and the second core material 7 is restricted from moving in the Y direction with respect to the stretching belt 502. be. As a result, the insertion state of the first core member 6 through the first hole 5a and the joint portion 512 of the belt body 501, and the insertion state of the second core member 7 through the second hole portion 5b and the joint portion 522 of the stretching belt 502 is maintained.

(Procedure for connecting belt body and stretching belt)
A procedure for connecting the belt body 501 and the stretching belt 502 will be described with reference to FIGS. 12 and 13. FIG.

First, in the belt main body 501 and the stretching belt 502 , the joint portion 512 of the belt main body 501 and the joint portion 522 of the stretching belt 502 face each other in the longitudinal direction (X direction) of the belt main body 501 and the stretching belt 502 .

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

Next, the first core material 6 is passed through the joint portion 512 of the belt main body 501 and the first hole portion 5 a of the connecting metal fitting 5 , and the second core material 6 is passed through the joint portion 522 of the stretching belt 502 and the second hole portion 5 b of the connecting metal fitting 5 . The belt main body 501 and the stretching belt 502 are connected by passing the core material 7 .

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 coming off. The joint portion 512 of the belt main body 501 and the joint portion 522 of the stretching belt 502 connected together may be covered with an outermost peripheral cover layer (not shown) covering the outer peripheral side.

(Effect of the fifth embodiment)
The following effects can be obtained in the fifth embodiment.

In the fifth embodiment, as described above, the connecting member includes the connecting fitting 5 having the first hole 5a and the second hole 5b, and the rod-shaped first core member 6 passed through the first hole 5a. , and a rod-shaped second core member 7 that is passed through the second hole 5b. is a state in which the joint portion 512 of the belt main body 501 and the joint portion 522 of the stretched belt 502 face each other in the longitudinal direction of the belt main body 501 and the stretched belt 502, and the joint portion 512 of the belt main body 501 and the first joint portion of the connecting fitting 5 are arranged. The first core member 6 is passed through the hole portion 5a, and the second core member 7 is passed through the joint portion 522 of the stretching belt 502 and the second hole portion 5b of the connecting fitting 5, thereby connecting them. It is As a result, the joint portion 512 of the belt body 501 and the joint portion 522 of the stretching belt 502 face each other in the longitudinal direction of the belt body 501 and the stretching belt 502 by the connecting fitting 5 , the first core member 6 and the second core member 7 . It can be connected in a state where As a result, compared to the case where the joint portion of the belt body and the joint portion of the stretched belt are alternately meshed in the lateral direction (width direction, that is, the Y direction) of the belt body and the stretched belt, the belt body 501 The width of the joint portion 512 of the stretched belt 502 and the width of the joint portion 522 of the stretched belt 502 can be increased, and the tensile strength of the joint portion 512 of the belt body 501 and the joint portion 522 of the stretched belt 502 can be increased.

In the fifth embodiment, as described above, the connecting fitting 5 is at least one end of the joint portion 512 of the belt body 501 and the joint portion 522 of the stretching belt 502 in the lateral direction of the belt body 501 and the stretching belt 502. One at 500a and one at the other end 500b. As a result, the connecting fitting 5 configured to receive the tension of the belt main body 501 and the stretching belt 502 is moved to the joint portion 512 of the belt main body 501 and the joint portion 522 of the stretching belt 502 in the lateral direction of the belt main body 501 and the stretching belt 502. , the connected state of the belt main body 501 and the stretching belt 502 can be stably maintained.

In the fifth embodiment, as described above, the joint portion 512 of the belt main body 501 and the joint portion 522 of the stretching belt 502 are formed in a comb-like shape when viewed from the thickness direction of the belt main body 501 and the stretching belt 502, and are connected. In addition to the one end portion 500a and the other end portion 500b of the joint portion 512 of the belt body 501 and the joint portion 522 of the stretching belt 502, the metal fitting 5 is attached to the joint portion 512 of the belt body 501 and the comb of the stretching belt 502. It is also arranged in the gap portion CL of the toothed joint portion 522 . As a result, the connecting fittings 5 are also arranged in the gaps CL between the comb-toothed joint portion 512 of the belt body 501 and the comb-toothed joint portion 522 of the stretched belt 502, so that the belt body 501 and the stretched belt 502 are connected. The state can be held more stably.

In the fifth embodiment, as described above, the first core material 6 and the second core material 7 are attached near the ends thereof, and each of the first core material 6 and the second core material 7 has the joint portion 512, Further provided is a retaining member P that prevents it from coming off from 522 . As a result, the first core material 6 and the second core material 7 can be prevented from coming off by the retaining member P, so that the attached state of the first core material 6 and the second core material 7 can be stably maintained. be able to.

[Modification]
The embodiments disclosed this time should be considered illustrative and not restrictive in all respects. The scope of the present invention is indicated by the scope of the claims rather than the description of the above-described embodiments, and includes all modifications (modifications) within the scope and meaning equivalent to the scope of the claims.

For example, in the above-described first to fifth embodiments, an example in which the joint portion is provided with four annular portions (comb teeth) has been shown, but the present invention is not limited to this. In the present invention, the number of annular portions (comb teeth) different from four (either an even number or an odd number) may be provided in the joint.

Further, in the first to fifth embodiments, the number of annular portions (comb teeth) of the first (third) joint portion and the number of annular portions (comb teeth) of the second (fourth) joint portion 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 may differ from the number of annular portions (comb teeth) of the second (fourth) joint.

In addition, in the above-described first to fifth embodiments, examples were shown in which the plurality of annular portions (comb teeth) of the first (second to fourth) joint portions have the same shape, but the present invention is limited to this. can't In the present invention, the shapes of the plurality of annular portions (comb teeth) of the first (second to fourth) joint portions may be different from each other.

In the first, second and fifth embodiments, the core fabric layer has a single-layer structure, and in the third and fourth embodiments, the core fabric layer has a three-layer structure. The 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.

In addition, in the above-described first to fifth embodiments, an example in which only one set (connection point) of the first joint portion and the second joint portion is provided in the belt body has been shown, but the present invention is limited to this. can't In the present invention, the belt body may be provided with a plurality of sets (connection points) of the first joint portion and the second joint portion.

Further, in the first to fifth embodiments, 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 may have different shapes.

Further, in the above-described first to fifth embodiments, an example in which the conveyor belt is used in a tunnel has been shown, but the present invention is not limited to this. Conveyor belts may be used in the present invention, such as in factories.

Further, in the above-described first to fifth embodiments, an example in which a joint portion is formed by providing a rectangular cut is shown, but the present invention is not limited to this. In the present invention, the joint portion may be formed by providing an incision having a shape different from a rectangular shape, such as an elliptical shape.

Reference Signs List 1, 201, 301, 401, 501 belt body 2, 202, 302, 402, 502 stretching belt 3 common core member (connecting member)
4 joint cover layer 5 connecting fitting (connecting member)
5a First hole (of connecting metal fitting) 5b Second hole (of connecting metal fitting) 6 First core material (connecting member)
7 Second core material (connecting member)
10, 20, 310, 320 core fabric layers 11a, 11b, 21a, 21b core cover layers 12, 22, 212, 222, 412, 422, 512, 522 joint portion 12a first joint portion 12b second joint portion 22a Third joint part 22b Fourth joint part 100, 200, 300, 400, 500 Conveyor belt 401a, 402a Reinforcing material 500a One end 500b Other end CL Gap part P Retaining member

Claims (18)

A conveyor belt comprising a belt body and a stretching belt, wherein the stretching belt can be stretched by connecting the stretching belt to the belt body,
Each of the belt body and the stretched belt includes:
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 fabric layer is disposed at the longitudinal ends of the belt body and the stretching belt, and is made of the same material as the core fabric layer, or the same material as the core fabric layer, or is stronger than the core fabric layer. A planar joint made of a high-strength material is provided,
A conveyor belt, wherein the belt main body and the stretched belt are configured to be connected by attaching a connecting member to the joint portion of each other. The joint portion of each of the belt main body and the stretched belt is formed by folding back the end portion of the joint portion and joining it to the core canvas layer so that the belt main body and the stretched belt are stretched from the lateral direction of each of the belt main body and the stretched belt. Look, formed in a ring,
The belt main body and the stretched belt are connected by passing the rod-shaped connecting member through the annular joint portion of the belt main body and the joint portion of the stretched belt, A conveyor belt according to claim 1. 3. The conveyor belt according to claim 1, wherein said joint portions of said belt main body and said stretched belt are formed in a comb-tooth shape when viewed from the thickness direction of said belt main body and said stretched belt. 4. The joint portion of each of the belt main body and the stretched belt according to any one of claims 1 to 3, wherein the joint portion is formed directly on the core canvas layer by processing the core canvas layer itself. conveyor belt. 4. The joint portion of each of the belt main body and the stretched belt is formed of a member separate from the core canvas layer, and is directly joined to the core canvas layer. Conveyor belt according to . The core canvas layer of each of the belt body and the stretched belt has a multi-layer structure,
6. The conveyor according to claim 5, wherein the joint portion of each of the belt main body and the stretching belt is directly joined to the core canvas layer while being sandwiched between the core canvas layers of the multi-layer structure. belt. Conveyor belt according to any one of claims 1 to 6, wherein the material that is the same as or stronger than the core fabric layer comprises rayon, vinylon, nylon, or polyester. The conveyor belt according to any one of claims 1 to 7, further comprising a joint cover layer that individually covers and protects the joint of the belt body and the joint of the stretched belt. . 3. The conveyor belt according to claim 2, wherein each of said belt main body and said stretched belt includes a reinforcing member arranged along said folded back joint portion so as to cover said joint portion from the outer peripheral side. The joint portion of the belt body includes:
a first joint portion disposed at one end in the longitudinal direction of the belt body;
a second joint portion arranged at the other end in the longitudinal direction of the belt body and connectable to the first joint portion;
The joint portion of the stretching belt is
a third joint portion arranged at one end in the longitudinal direction of the stretching belt and connectable to the first joint portion;
The conveyor belt according to any one of claims 1 to 9, further comprising a fourth joint section arranged at the other end in the longitudinal direction of the stretching belt and connectable to the second joint section. The conveyor belt according to any one of claims 1 to 10, which is a conveyor belt for tunnels installed and used in a tunnel pit. The belt main body and the stretched belt are connected by the connecting member in a state in which the comb teeth of the joint portion of the belt main body and the joint portion of the stretched belt are alternately engaged with each other. 4. The conveyor belt of claim 3 configured. 13. The conveyor according to claim 12, wherein the connecting member includes a common core member that is passed through the joint portion of the belt body and the joint portion of the stretching belt that are engaged so that the comb teeth are alternately engaged. belt. The connecting member includes a connecting fitting having a first hole and a second hole, a rod-shaped first core member passed through the first hole, and a rod-shaped second core passed through the second hole. a core material;
The joint portion of the belt body and the joint portion of the stretching belt are formed in an annular shape,
The belt main body and the stretched belt are arranged such that the joint portion of the belt main body and the joint portion of the stretched belt face each other in the longitudinal direction of the belt main body and the stretched belt. and the first core material is passed through the first hole of the connecting fitting, and the second core material is passed through the joint of the stretching belt and the second hole of the connecting fitting. Conveyor belt according to any one of claims 1 to 11, wherein the conveyor belt is configured to be connected by: At least one connecting fitting is provided at one end of the joint portion of the belt main body and the joint portion of the stretching belt in the lateral direction of the belt body and the stretched belt, and one at the other end. 15. The conveyor belt according to claim 14, wherein the conveyor belt is arranged in two. The joint portion of the belt main body and the joint portion of the stretched belt are formed in a comb-like shape when viewed from the thickness direction of the belt main body and the stretched belt,
In addition to the one end portion and the other end portion of the joint portion of the belt body and the joint portion of the stretched belt, the connecting fitting is provided at the comb-shaped joint portion of the belt body and the stretched belt. 16. The conveyor belt according to claim 15, which is also arranged in the interstices of the comb-tooth joint. a retainer member attached near each end of the first core material and the second core material to prevent the joint part of the first core material and the second core material from coming off from the joint part; The conveyor belt of any one of claims 14-16, further comprising. A conveyor belt stretching method for stretching by connecting the stretching belt to a belt body,
At the longitudinal ends of each of the belt body and the stretching belt, the same material as the core fabric layer or the core fabric layer is added to the core fabric layer that reinforces each of the belt body and the stretching belt. A step of providing a planar joint portion made of a material that is the same as or stronger than the core canvas layer;
A method for stretching a conveyor belt, comprising a step of stretching by attaching connecting members to the joint portions of each of the belt main body and the stretching belt and connecting the stretching belt to the belt main body.

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