JP2019064784A - Method for joining conveyor belt - Google Patents

Abstract

To provide a junction method which can join ends in a longitudinal direction of the conveyor belt in which a tension member layer is composed of a steel cord with good working efficiency while securing stable a joint strength.SOLUTION: A junction method includes: embedding a metal coil 9 in an unvulcanized adhesive rubber 8 to previously manufacture a molded body 7 for junction in which the inside of the coil 9 is converted into a cavity hole 9a; converting a large number of steel cords 3 into an exposed state on longitudinal-direction ends 1A and 1B; cutting the steel cords 3 at the predetermined position by the predetermined length; enabling the steel cord 3 on the longitudinal-direction ends 1A and 1B to be arranged between mating steel cords 3; inserting each of the corresponding steel cords 3 into the coil 9 of each of the molded bodies 7 for junction arranged side by side corresponding to each of the steel cords 3 in the exposed state; arranging the steel cords 3 on the longitudinal-direction ends 1A and 1B between the mating steel cords 3; and then vulcanizing each of the molded bodies 7 for junction in a state where non-vulcanized upper and lower cover rubbers 5a and 5b are arranged in the molded bodies.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a method of joining conveyor belts, and more particularly, the operation of the joining process while securing stable joint strength between longitudinal ends of conveyor belts having core layers composed of steel cords. The present invention relates to a conveyor belt joining method capable of improving the efficiency.

  Among the core layers of the conveyor belt, there are those in which a large number of steel cords are arranged side by side and extend in the longitudinal direction of the belt. In a conveyor belt in which such a core layer is embedded, it takes a lot of man-hours to join the longitudinal end portions of the belt. In this bonding step, first, the cover rubber at the longitudinal end of the belt is removed to expose the core layer, and the adhesive rubber between the adjacent steel cords in the side-by-side arrangement is removed. Then, the steel cord at a predetermined position is cut in the longitudinal direction by a predetermined length, and the steel cords of the core layers at the longitudinal end of the belt to be joined are positioned and arranged between the steel cords of the opposite sides. Next, the upper surface and the lower surface of the area where the steel cords of each other are disposed between the opposing steel cords are subjected to adhesion processing to place the unvulcanized upper cover rubber and the unvulcanized lower cover rubber in a state of being disposed. Vulcanize. When this vulcanization process is completed, the longitudinal end portions of the belt are joined.

  As described above, since it is necessary to perform a large number of man-hours at a use site of a conveyor belt or the like in the conventional bonding process, various measures for reducing the number of man-hours have been proposed (for example, see Patent Document 1). In patent document 1, when manufacturing a conveyor belt, the method to embed the rubber | gum for peeling previously at the belt longitudinal direction end part is proposed. The release rubber is embedded between the adhesive rubber covering the surface of the core layer (the steel cord layer), and the upper cover rubber and the lower cover rubber. Since the peeling rubber is non-adhesive to the bonding rubber, the peeling rubber can be easily peeled from the bonding rubber in the bonding step. Thereby, the core layer coated with the adhesive rubber can be rapidly exposed.

  When the number of steel cords constituting the core layer is large, it is very important to position and arrange the exposed steel cords of each longitudinal end in a predetermined position between the opposing steel cords. It takes a lot of man-hours. Therefore, there is room for improvement in the reduction of man-hours in the entire bonding process.

Japanese Patent Application Laid-Open No. 6-345231

  An object of the present invention is to provide a conveyor belt capable of improving the working efficiency of a joining process while securing stable joining strength between longitudinal ends of a conveyor belt having a core layer composed of steel cords. Providing a bonding method of

  In order to achieve the above object, a method of joining conveyor belts according to the present invention comprises an upper cover rubber, a lower cover rubber, and a core layer sandwiched and embedded between the upper cover rubber and the lower cover rubber. The core layer joins the longitudinal ends of the conveyor belt, which is constituted by extending in the longitudinal direction of the belt in a state in which a large number of steel cords whose surfaces are coated with adhesive rubber are arranged side by side. In a method of joining conveyor belts, a joining molded body is manufactured in advance in which a metal coil is embedded in unvulcanized adhesive rubber and the inside of the coil is a hollow hole. A plurality of steel cords are exposed in a state with a gap between adjacent ones in a row, and the steel cord at a predetermined position is cut by a predetermined length in the longitudinal direction. The respective joining moldings arranged side by side in correspondence with the respective steel cords of the exposed state, with the steel cords of the longitudinal ends of the steel cords being able to be arranged between the steel cords of the other side. The steel cords of the respective exposed state corresponding to the respective bonding bodies are inserted into the body coil, and the steel cords of the respective longitudinal ends are inserted between the steel cords which are opposite to each other. It is characterized in that it is placed and then vulcanized with the unvulcanized upper cover rubber and the unvulcanized lower cover rubber disposed on the upper surface and the lower surface of each of the bonding moldings, respectively.

  According to the present invention, a bonding molded body in which a metal coil is embedded in unvulcanized adhesive rubber and the inside of the coil is a hollow hole is manufactured in advance. Therefore, if a large number of steel cords are exposed at each longitudinal end with a gap between adjacent ones in a row, the steel cord at a predetermined position is cut by a predetermined length in the longitudinal direction, By inserting the exposed steel cords into the coils of the corresponding bonding bodies, the steel cords at the respective longitudinal ends are positioned and positioned precisely between the steel cords of the opposite sides. it can. And the adhesion process with respect to the steel cord of an exposure state can be simplified by performing this arrangement | positioning operation | work. Thereafter, the bonding process is completed by vulcanizing in a state where the unvulcanized upper cover rubber and the lower cover rubber are disposed above and below the respective bonding moldings, so that the bonding process is simplified and the working efficiency is improved. .

  At the time of vulcanization, the adhesive rubber in which the coil is embedded intrudes into the cavity of the coil and adheres securely to the steel cord inserted in the coil, so that stable bonding strength can be secured. Furthermore, when a joined conveyor belt is used and bent, the coils embedded in the conveyor belt expand and contract, so that the flexibility of the conveyor belt is not impaired.

It is explanatory drawing which illustrates a conveyor belt by cross sectional view. It is explanatory drawing which illustrates the longitudinal direction edge part of the conveyor belt of FIG. 1 by planar view. It is explanatory drawing which illustrates the molded article for joining used by this invention by cross-sectional view. It is explanatory drawing which illustrates the molded object for joining of FIG. 3 by planar view. It is explanatory drawing which illustrates the composite which integrated the some molding for joining in a cross-sectional view. It is explanatory drawing which illustrates the complex of FIG. 5 by planar view. FIG. 2 is a plan view illustrating the longitudinal end of the conveyor belt of FIG. 1 with the steel cords exposed. It is explanatory drawing which illustrates the state which arrange | positioned the steel cord of each longitudinal direction end between the steel cords of the other side in planar view. It is explanatory drawing which illustrates the state by which each steel cord of FIG. 8 of an exposure state was inserted in the corresponding coil in planar view. It is an explanatory view which illustrates a vulcanization process by side view. It is explanatory drawing which illustrates each joined longitudinal end in planar view.

  Hereinafter, a method of joining conveyor belts of the present invention will be described based on an embodiment shown in the drawings.

  As illustrated in FIGS. 1 and 2, the conveyor belt 1 to which the present invention is applied is sandwiched between the upper cover rubber 5, the lower cover rubber 6, and the upper cover rubber 5 and the lower cover rubber 6. And the core layer 2 embedded. In the belt width direction of the upper cover rubber 5 and the lower cover rubber 6, so-called ear rubbers are joined. These members are integrated by vulcanization bonding.

  The core layer 2 is configured such that a large number of steel cords 3 whose surfaces are coated with an adhesive rubber 4 extend in the longitudinal direction of the belt in a state of being laterally arranged in the belt width direction. The core layer 2 is a member that mainly bears the tension when the conveyor belt 1 is stretched. The core layer 2 composed of the steel cord 3 basically has a single-layer structure.

  The steel cord 3 is formed by twisting a plurality of strands. The number of buried steel cords 3, the outer diameter, the arrangement pitch of the side by side, etc. are appropriately determined according to the performance required of the conveyor belt 1.

  The longitudinal ends 1A, 1B of the conveyor belt 1 are joined using the present invention. In the present invention, the bonding molded body 7 illustrated in FIGS. 3 and 4 is used. In the bonding molded body 7, the metal coil 9 is embedded in the unvulcanized adhesive rubber 8, and the inside of the coil 9 is a hollow hole 9 a. That is, the openings at both ends in the longitudinal direction of the coil 9 are exposed at both ends in the longitudinal direction of the bonding molded body 7, and the hollow holes 9 a penetrate the bonding molded body 7 in the longitudinal direction.

  The coil 9 is formed by spirally winding a metal wire. The outer diameter of the metal wire is smaller than the outer diameter of the steel cord 3 and is, for example, 5% or more and 50% or less of the outer diameter of the steel cord 3. The spiral winding pitch of the metal wire is, for example, not less than twice and not more than 20 times the outer diameter of the metal wire. That is, the coil 9 does not have the metal wire tightly wound in a spiral shape, but has a specification in which the metal wires are spirally wound with a sufficient gap between them in a side view.

  The inner diameter of the hollow hole 9a is set to, for example, 110% or more and 200% or less of the outer diameter of the steel cord 3, and more preferably, 130% or more and 180% or less. If the inner diameter of the hollow hole 9a is too small, it will be difficult to smoothly insert the steel cord 3. When the inner diameter of the hollow hole 9a is too large, when the coils 9 are embedded adjacent to the conveyor belt 1, the coils 9 easily interfere with each other. The length of the coil 9 is set based on the bonding length of the longitudinal end portions 1A and 1B, and the like.

  Preferably, the coil 9 is plated with brass. The adhesion between the coil 9 and the adhesive rubber 8 can be improved by performing this plating process. The material of the coil 9 can be made of general carbon steel or the like, but it is preferable to use spring steel. By adopting the coil 9 of spring steel, the durability can be improved. Moreover, it can avoid that the flexibility of the conveyor belt 1 is impaired so that it may mention later.

  Basically, the same number of bonding moldings 7 is used as the number of steel cords 3 arranged side by side of the conveyor belt 1 to be processed. A required number of bonding molded bodies 7 are manufactured in advance in a factory or the like. The bonding molded body 7 is manufactured, for example, by arranging the coil 9 between the plate-like members of the unvulcanized adhesive rubber 8 opposed to each other and bringing the respective plate-like members into contact and integrating them.

  In this embodiment, each of the bonding molded bodies 7 is in the form of a stick in which one coil 9 is embedded in the unvulcanized adhesive rubber 8 and is used as it is. However, in addition to being used in such a state, it can also be used as the composite 10 illustrated in FIGS. 5 and 6. The composite 10 can be manufactured by integrating a plurality of bonding compacts 7 in advance such that the respective coils 9 are arranged side by side.

  The number of the bonding molded bodies 1 forming the composite 10 may be two or three, and may be an appropriate number. The composite 10 illustrated in FIGS. 5 and 6 is manufactured by integrating the bonding moldings 7 in the same number as the number of steel cords 3 arranged side by side of the conveyor belt 1 to be processed.

  In order to join the longitudinal direction end portions 1A and 1B of the conveyor belt 1, the following procedure is performed. Even when longitudinal ends 1A and 1B of one conveyor belt are joined to form an annular conveyor line, longitudinal ends 1A and 1B of different conveyor belts are joined to form a plurality of conveyor belts 1 It may be used to form an annular conveyor line.

  As described above, the bonding molded body 7 illustrated in FIGS. 3 and 4 or the composite 10 illustrated in FIGS. 5 and 6 is manufactured in advance. Next, the following operation is performed at the use site of the conveyor belt 1 or the like.

  At each longitudinal end 1A, 1B, the upper cover rubber 5 and the lower cover rubber 6 are cut with a cutter or the like. Subsequently, the upper cover rubber 5 and the lower cover rubber 6 of the longitudinal direction end portion 1A of the conveyor belt 1 are removed with the cut as a trigger. In addition, the adhesive rubber 4 between the adjacent steel cords 3 in the side-by-side arrangement is also removed.

  Since the bonding rubber 4 adheres to the surface of the steel cord 3, buffing or the like is appropriately performed. In addition, buffing etc. is given to necessary parts. The bonding rubber 4 appropriately remains on the surface of the steel cord 3. The adhesive rubber 4 remaining on the surface of the steel cord 3 is not shown. By this operation, as illustrated in FIG. 7, at the longitudinal end 1A, a large number of steel cords 3 are exposed with a gap g between adjacent ones in a line. The same operation is performed for the other longitudinal end 1B.

  In this embodiment, the upper cover rubber 5 and the lower cover rubber 6 are removed at an angle with respect to the belt width direction in plan view at the respective longitudinal end portions 1A and 1B. The cover rubber 5 and the lower cover rubber 6 can be removed orthogonally to the belt width direction in plan view.

  Next, the steel cord 3 at the predetermined position is cut in the longitudinal direction by a predetermined length among the plurality of exposed steel cords 3. For example, as shown in FIG. 8, at the longitudinal end 1A of the conveyor belt 1, the steel cords 3 are cut by a predetermined length every other one in the belt width direction. At the longitudinal direction end 1B of the conveyor belt 1 to be joined, the positions of the steel cords 3 to be cut are offset from the longitudinal direction end 1A by one in the belt width direction, and every other line in the belt width direction Cut the steel cord 3 to a predetermined length.

  Thereby, as illustrated in FIG. 8, the steel cords 3 of the respective longitudinal ends 1A and 1B can be arranged between the steel cords 3 of the opposite sides. The core layers 2 (steel cords 3) of the respective longitudinal ends 1A, 1B are at the same level (at the same height position) and are in an assembled state.

  Next, as illustrated in FIG. 9, a plurality of bonding moldings 7 are arranged side by side corresponding to the exposed steel cords 3 respectively. One steel cord 3 corresponding to each bonding compact 7 is inserted into the hollow holes 9a of the coils 9 of the bonding compacts 7 arranged side by side. With the steel cords 3 of the respective longitudinal ends 1A, 1B inserted into the coil 9, they are arranged between the steel cords 3 of the other side.

  Next, as illustrated in FIG. 10, the unvulcanized upper cover rubber 5a and the unvulcanized lower cover rubber 6a are disposed on the upper and lower surfaces of each of the bonding molded bodies 7, respectively. If necessary, unvulcanized rubber to be ear rubber is disposed on the widthwise outside of the longitudinal end portions 1A and 1B. In this state, the area where the upper cover rubber 5a and the lower cover rubber 5b (and the unvulcanized rubber to be the ear rubber) are disposed is heated and pressed by a heat plate or the like to perform a vulcanization process.

  After the predetermined vulcanization time has elapsed, the longitudinal end portions 1A and 1B are joined to each other as illustrated in FIG. At the portions joined in this manner, the steel cords 3 of the longitudinal end portions 1A and 1B, the adhesive rubber 8, the coil 9, the upper cover rubber 5, and the lower cover rubber 6 are integrated by vulcanization bonding.

  As described above, in the present invention, the bonding molded body 7 is manufactured in advance. Therefore, the steel cord 3 is exposed at each longitudinal end 1A, 1B with a gap between the adjacent side by side, and the steel cord 3 at a predetermined position is cut by a predetermined length in the longitudinal direction. For example, by inserting the exposed steel cords 3 into the coils 9 of the corresponding joining moldings 7, the steel cords 3 of the respective longitudinal ends 1A, 1B are mutually opposed steel cords. It can be accurately positioned and arranged between three. Even if the number of steel cords 3 is large, the steel cord 3 is inserted into the hollow hole 9a of the coil 9, so that it can be performed easily and quickly.

  And by performing this arrangement | positioning operation | work, adhesion processes, such as apply | coating an adhesive agent with respect to the steel cord 3 of an exposure state, can also be abbreviate | omitted or simplified. Thereafter, the bonding process is completed by vulcanizing in a state where the unvulcanized upper cover rubber 5a, the lower cover rubber 5b and the like are disposed above and below the respective bonding molded bodies 7. Therefore, the bonding process is simplified and the working efficiency is improved.

  At the time of the above-mentioned vulcanization, the non-vulcanized adhesive rubber 8 in which the coil 9 is embedded flows and enters the cavity hole 9a. Along with this, since the vulcanized adhesive rubber 8 adheres securely to the steel cord 3 inserted in the coil 9, stable joint strength between the longitudinal end portions 1A and 1B can be secured.

  The coils 9 are embedded in the conveyor belt 1 after the joining process of the present invention is completed. Although the conveyor belt 1 will be repeatedly bent when used, the coil 9 expands and contracts in accordance with the bending of the conveyor belt 1, so the flexibility of the conveyor belt 1 is not impaired.

  The steel cord 3 inserted in the coil 9 is surrounded by the coil 9 to be in a protected state. Therefore, the range in which the steel cord 3 is inserted into the coil 9 is advantageous in preventing the problem of cutting due to external damage when the conveyor belt 1 is used.

  According to the joining method of the present invention, when joining the longitudinal ends 1A and 1B of the existing conveyor belt 1, the longitudinal end 1A of the existing conveyor belt 1 and the longitudinal ends 1B of the new conveyor belt 1 are connected. Can be applied to the case where longitudinal end portions 1A and 1B of the new conveyor belt 1 are joined to each other.

  In this embodiment, the upper cover rubber 5 and the lower cover rubber 6 are removed from the respective longitudinal ends 1A, 1B to expose the steel cords 3. However, the steel cord 3 is exposed by a known method. The steel cord 3 can also be exposed. For example, the steel cord 3 of the longitudinal end portions 1A and 1B can be easily exposed by using a known method at the manufacturing stage of the new conveyor belt 1. In this case, since the bonding process can be further simplified, the working efficiency is further improved.

1 Conveyor Belt 1A, 1B Longitudinal End 2 Core Layer 3 Steel Cord 4 Bonding Rubber 5 Upper Cover Rubber 5a Unvulcanized Upper Cover Rubber 6 Lower Cover Rubber 6a Unvulcanized Lower Cover Rubber 7 Molding for Bonding 8 Unvulcanized adhesive rubber 9 Metal coil 9a hollow hole 10 composite

Claims (4)

An upper cover rubber, a lower cover rubber, and a core layer sandwiched between the upper cover rubber and the lower cover rubber and embedded therein, the core layer is coated with the bonding rubber. In a method of joining conveyor belts in which longitudinal ends of conveyor belts are constructed by extending a plurality of steel cords extending in the longitudinal direction of the belt side by side.
Manufacturing a bonding molded body in which a metal coil is embedded in unvulcanized adhesive rubber and the inside of the coil is a hollow hole,
The steel cords at predetermined positions are cut by a predetermined length in a longitudinal direction, with the plurality of steel cords exposed at each longitudinal end, with a gap between adjacent side by side in a row. The respective joints arranged side by side in correspondence with the respective steel cords of the exposed state, with the steel cords of the respective longitudinal ends being able to be arranged between the steel cords of the other side with each other The steel cords of the respective exposed state corresponding to the respective bonding moldings are inserted into the coils of the moldings of the molding, and the steel cords of the respective longitudinal ends of the steel cords of the respective opposing ones And then unvulcanized upper cover rubber, under unvulcanized, respectively, Method of joining conveyor belt, characterized in that the vulcanization in the state of being arranged Bagomu.   The method according to claim 1, wherein each of the coils is plated with brass.   The method according to claim 1, wherein each of the coils is formed of spring steel.   The method according to any one of claims 1 to 3, wherein a composite in which a plurality of the bonding moldings are integrated in advance so that the respective coils are arranged side by side is used.

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