JP2017145064A - Conveyor belt and method for joining the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conveyor belt capable of improving work efficiency in a joining step to join both end parts of the conveyor belt comprising a core body layer composed of steel cords; and to provide a method for joining the conveyor belt.SOLUTION: A core body layer 2 is composed of a large number of steel cords 3 coated by adhesive rubbers 4, and extended side by side in a belt longitudinal direction. At a longitudinal direction end part 1A, the top and the bottom of the core body layer 2 are coated by and embedded in release layers 7a and 7b incapable of adhering to the adhesive rubbers 4, respectively. The release layers 7a and 7b are entered between the steel cords 3 adjacent to each other side by side. A belt conveyor 1 is produced in advance in a condition in which the adhesive rubbers 4 which are the surfaces of the adjacent steel cords 3 are released from each other by the release layers 7a and 7b, and in a joining step, the large number of steel cords 3 are exposed in a gap g made between the steel cords 3 adjacent to each other side by side by removing an upper cover rubber 5 and a lower cover rubber 6 together with the release layers 7a and 7b.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a conveyor belt and a joining method thereof, and more specifically, a conveyor belt capable of improving the working efficiency of a joining process between end portions of a conveyor belt having a core layer composed of steel cords, and the same. The present invention relates to a joining method.

  Some core layers of the conveyor belt include a plurality of steel cords arranged side by side and extending in the belt longitudinal direction. In a conveyor belt in which such a core layer is embedded, a great number of man-hours are required to join the belt longitudinal ends. In this joining step, first, the cover rubber at the end portion in the belt longitudinal direction is removed to expose the core layer. Next, the adhesive rubber between the steel cords adjacent in a row is removed to form a gap between the steel cords. Next, the steel cord at a predetermined position is cut by a predetermined length in the longitudinal direction, and the steel cords of the core layers at the longitudinal ends of the belt to be joined are inserted between the opposite steel cords. Next, each steel cord is vulcanized in a state where an unvulcanized upper cover rubber and an unvulcanized lower cover rubber are arranged on the upper and lower surfaces of the region where the steel cord is inserted between the opposite steel cords, respectively. When this vulcanization step is completed, the belt longitudinal ends are joined together.

  As described above, since the conventional joining process requires a great number of man-hours at the site where the conveyor belt is used, various measures for reducing the man-hours have been proposed (for example, see Patent Document 1). In patent document 1, when manufacturing a conveyor belt, the method of embedding peeling rubber in the belt longitudinal direction edge part previously is proposed. This peeling rubber is embedded between the adhesive rubber that covers the surface of the core layer (steel cord layer), and the upper cover rubber and the lower cover rubber. Since the peeling rubber is non-adhesive to the adhesive rubber, the peeling rubber can be easily peeled from the adhesive rubber in the joining step. Thereby, the core body layer covered with the adhesive rubber can be quickly exposed. However, in the exposed core layer, the steel cords that are adjacent to each other are joined together by the adhesive rubber. Therefore, it is necessary to remove the adhesive rubber between adjacent steel cords. Since this removal operation takes a very long time, there is room for improvement in reducing the man-hours of the entire joining process.

JP-A-6-345231

  The objective of this invention is providing the conveyor belt which can improve the working efficiency of the joining process of the edge part of the conveyor belt provided with the core body layer comprised with a steel cord, and its joining method.

  In order to achieve the above object, a conveyor belt of the present invention comprises an upper cover rubber, a lower cover rubber, and a core layer embedded between the upper cover rubber and the lower cover rubber. In the conveyor belt in which the core layer is formed by extending a plurality of steel cords whose surfaces are coated with adhesive rubber in a side-by-side manner in the longitudinal direction of the belt, at the end in the longitudinal direction of the belt, Rubber is a non-adhesive release layer that is embedded to cover the upper and lower sides of the core body layer, and the release layer enters between the adjacent steel cords side by side, and the surface of the adjacent steel cords The adhesive rubbers covering each other are separated from each other by the release layer.

  The method for joining conveyor belts of the present invention is the method for joining conveyor belts in which the longitudinal ends of the conveyor belts are joined together, wherein the upper cover rubber and the lower cover rubber at the longitudinal ends of the conveyor belt are peeled off. By removing together with the layer, the plurality of steel cords whose surfaces are coated with the adhesive rubber are exposed with gaps between the side-by-side adjacent ones, and then the steel cords at predetermined positions are elongated. The steel cords between the core layers at the longitudinal ends of the belt to be joined are inserted between the mating steel cords, and then each other steel cord is mated with the mating steel cord. An unvulcanized upper cover rubber and an unvulcanized lower cover rubber are arranged on the upper and lower surfaces of the region inserted between A manner wherein the vulcanizing.

  According to the conveyor belt of the present invention, the non-adhesive release layer is embedded so as to cover the upper and lower sides of the core body layer from the adhesive rubber covering the surface of the steel cord. Then, a release layer enters between the steel cords adjacent to each other side by side, and the adhesive rubbers covering the surfaces of the adjacent steel cords are separated by the release layer. Therefore, in the joining process between the longitudinal ends of the conveyor belt, the upper cover and the lower cover rubber are removed together with the release layer, so that a large number of steel cords whose surfaces are covered with the adhesive rubber are adjacent to each other side by side. It is easy and quick to expose with a gap between them. That is, conventionally, it is not necessary to remove the adhesive rubber that joins the steel cords that require the most man-hours in the joining process to ensure a gap. Thereby, it becomes possible to improve the working efficiency of a joining process significantly.

It is a cross-sectional view which illustrates the longitudinal direction edge part of the conveyor belt of this invention. It is a top view of the longitudinal direction edge part of the conveyor belt of FIG. It is a top view which illustrates the state which exposed the steel cord with which the surface of FIG. 1 was coat | covered with the rubber | gum for adhesion | attachment. It is explanatory drawing which illustrates the state which inserted the steel cord of the core body layers of the belt longitudinal direction edge part to join between the steel cords of the other party by planar view. It is explanatory drawing which illustrates a vulcanization | cure process by a side view. It is explanatory drawing which illustrates the joined belt longitudinal direction edge part by planar view.

  Hereinafter, the conveyor belt and its joining method of the present invention will be described based on the embodiments shown in the drawings.

  As illustrated in FIG. 1 and FIG. 2, the conveyor belt 1 of the present invention is embedded between an upper cover rubber 5, a lower cover rubber 6, and the upper cover rubber 5 and the lower cover rubber 6. The body layer 2 is provided. A so-called ear rubber is joined in the belt width direction of the upper cover rubber 5 and the lower cover rubber 6. These members are integrated by vulcanization adhesion.

  The core body layer 2 is configured such that a large number of steel cords 3 whose surfaces are covered with an adhesive rubber 4 extend in the belt longitudinal direction in a side-by-side state in the belt width direction. The core body layer 2 is a member that mainly bears the tension when the conveyor belt 1 is stretched. The core body layer 2 composed of the steel cord 3 basically has a one-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 horizontal arrangement pitch, and the like are appropriately determined according to the performance required for the conveyor belt 1.

  Release layers 7 a and 7 b are embedded in the belt longitudinal end 1 </ b> A, and the release layers 7 a and 7 b cover the upper and lower sides of the core layer 2. The peeling layers 7a and 7b are inserted between the adjacent steel cords 3 side by side, and the adhesive rubbers 4 covering the surfaces of the adjacent steel cords 3 are separated by the peeling layers 7a and 7b. It has become. That is, between the adjacent steel cords 3, the release layers 7a and 7b disposed above and below the core body layer 2 are in contact with each other, and the adhesive rubber 4 is not in contact.

  The release layers 7a and 7b are non-adhesive to the adhesive rubber 4 and are sheet members that do not melt even at the vulcanization temperature (for example, 140 ° C. or higher and 200 ° C. or lower) when the conveyor belt 1 is manufactured. . As the release layers 7a and 7b, for example, a vulcanized rubber sheet or a resin release sheet (such as a polyethylene sheet or a fluororesin sheet) is used. The release layers 7a and 7b are preferably not fused to each other even at the vulcanization temperature.

  The end portions of the release layers 7a and 7b in the belt width direction are preferably embedded without being exposed to the outside of the conveyor belt 1 as in this embodiment. According to this specification, the upper cover rubber 5 and the lower cover rubber 6 are joined to each other, so that water, foreign matter, and the like do not enter the belt from the end in the belt width direction. This is advantageous in preventing problems such as rusting of the steel cord 3 during storage or conveyance of the conveyor belt 1.

  The conveyor belt 1 of this embodiment has an identification portion on the surface of the upper cover rubber 5 and the lower cover rubber 6 at a position corresponding to the belt longitudinal end of the release layers 7a and 7b (end on the side not the belt longitudinal end face). 8. Thereby, the identification part 8 will show the position of the belt longitudinal direction end of peeling layer 7a, 7b. As the identification unit 8, for example, rubber colored in a different color from the upper cover rubber 5 and the lower cover rubber 6 is used. As the color of the identification unit 8, it is preferable to adopt a conspicuous color that can be easily visually confirmed, for example, red, yellow, orange, or the like. The identification unit 8 can adopt various forms in addition to a continuous line.

  The longitudinal ends of the peeling layers 7a and 7b of this embodiment are inclined with respect to the belt width direction in a plan view, but may be oriented perpendicular to the belt width direction. Further, the release layers 7 a and 7 b are embedded with the position retracted from the end surface in the longitudinal direction of the conveyor belt 1 as the tip position. That is, there is a portion where the release layers 7a and 7b are not embedded at the front end of the conveyor belt 1 in the longitudinal direction of the belt, but this portion is arbitrarily set as an extra length portion to be gripped when the conveyor belt 1 is pulled into the conveyor line. Can be provided. This extra length is cut off after the conveyor belt 1 is drawn into the conveyor line.

  Next, the procedure of the conveyor belt joining method of the present invention will be described.

  First, the conveyor belt 1 illustrated in FIGS. 1 and 2 is manufactured at a factory. Next, the following work is performed at the site where the conveyor belt 1 is used.

  Cut the upper cover rubber 5 and the lower cover rubber 6 with a cutter or the like. This cut is made up to the release layers 7a and 7b embedded in the conveyor belt 1. Cut also into the belt side surface until it reaches the release layers 7a, 7b. When there is the identification unit 8, it is convenient because the notch reaching the peeling layers 7a and 7b can be accurately made using the position of the identification unit 8 as a guide.

  Next, using the formed notches as a trigger, the upper cover rubber 5 and the lower cover rubber 6 along the longitudinal end 1A of the conveyor belt 1 are removed together with the release layers 7a and 7b. Since the release layers 7a and 7b and the adhesive rubber 4 are not substantially bonded, both can be easily separated.

  By this removing operation, as illustrated in FIG. 3, a large number of steel cords 3 whose surfaces are covered with the adhesive rubber 4 are exposed with gaps g between adjacent ones in a row. Therefore, as in the conventional joining process, an operation of removing the adhesive rubber joining the adjacent steel cords (adhesive rubber removing operation) becomes unnecessary. Since the bonding rubber removing operation is the most time-consuming operation in the conventional bonding process, the time required for the bonding process can be greatly reduced according to the present invention.

  The exposed surface of the adhesive rubber 4 is appropriately buffed. In addition, buffing is applied to necessary parts. Since this conveyor belt 1 is manufactured by vulcanization in a state where the surface of the steel cord 3 is covered with the adhesive rubber 4, the inside of the steel cord 3 (between the strands constituting the steel cord 3) The adhesive rubber 4 is sufficiently invaded and filled.

  Next, among the multiple steel cords 3 covered with the exposed adhesive rubber 4, the steel cord 3 at a predetermined position is cut by a predetermined length in the longitudinal direction. For example, as shown in FIG. 4, at the longitudinal end 1A of the conveyor belt 1, every other cord in the belt width direction is cut by a predetermined length. At the longitudinal end 1B of the conveyor belt 1 to be joined, the steel cord 3 to be cut is offset from the longitudinal end 1A by one in the belt width direction, and every other one in the belt width direction. The steel cord 3 is cut into a predetermined length. Adhesive cement is applied to the exposed surface of the adhesive rubber 4.

  The joining method of the present invention is not limited to the case where the longitudinal end portions 1A of the conveyor belt 1 of the present invention are joined to each other, but the longitudinal end portion 1A of the conveyor belt 1 of the present invention is one side, and the conventional conveyor The present invention can also be applied to the case where the longitudinal end portion 1B of the belt is joined as a counterpart. In this case, a conventional operation is required at the longitudinal end 1B of the conventional conveyor belt, but the working efficiency is greatly improved for the longitudinal end 1A of the conveyor belt 1 of the present invention. As a whole process, a great merit can be obtained by improving work efficiency.

  Next, as illustrated in FIG. 4, the steel cords 3 between the core layers 2 of the belt longitudinal ends 1 </ b> A and 1 </ b> B to be joined are inserted between the opposite steel cords 3. As a result, the core layers 2 at the longitudinal ends 1A and 1B are at the same level (same height position) and are in a combined state.

  Next, as illustrated in FIG. 5, the upper cover and the lower surface of the region in which the steel cords 3 of the belt longitudinal direction end portions 1 </ b> A and 1 </ b> B are inserted between the steel cords 3 on the other side, respectively, The rubber 5a and the unvulcanized lower cover rubber 5b are placed. In this state, the region where the upper cover rubber 5a and the lower cover rubber 5b are disposed is heated while being pressed by a hot plate or the like to perform the vulcanization process.

  After elapse of a predetermined vulcanization time, the longitudinal ends 1A and 1B of the conveyor belt 1 are joined to each other as illustrated in FIG. In the joined portions, the steel cord 3 of the belt longitudinal end portions 1A and 1B, the adhesive rubber 4, the upper cover rubber 5, and the lower cover rubber 6 are integrated by vulcanization adhesion.

  As described above, in the present invention, at the stage of manufacturing the conveyor belt 1, the peeling layers 7a and 7b are embedded in the belt longitudinal end 1A in a specially devised state. In the joining step, the release layers 7a and 7b are used to expose a large number of steel cords 3 whose surfaces are covered by the adhesive rubber 4 with gaps g between adjacent ones of the side by side. Can be done easily and quickly. Thereby, conventionally, since the work that requires the most man-hours can be made more efficient in the joining process, the work efficiency is greatly improved even in the entire joining process.

1 Conveyor belt 1A, 1B Belt longitudinal end 2 Core layer 3 Steel cord 4 Adhesive rubber 5 Upper cover rubber 5a Uncured upper cover rubber 6 Lower cover rubber 6a Uncured lower cover rubber 7a, 7b Peeling Layer 8 identification part

Claims (4)

An upper cover rubber, a lower cover rubber, and a core body layer sandwiched between the upper cover rubber and the lower cover rubber are embedded, and the surface of the core body layer is covered with an adhesive rubber. In a conveyor belt constituted by a plurality of steel cords extending side by side in the belt longitudinal direction,
At the longitudinal end of the belt, a non-adhesive release layer is embedded to cover the upper and lower sides of the core layer, and the release layer is disposed between the adjacent steel cords side by side. A conveyor belt which is in a state in which the adhesive rubbers entering and covering the surfaces of adjacent steel cords are separated by the release layer.   The conveyor belt according to claim 1, wherein an end portion of the release layer in the belt width direction is embedded without being exposed to the outside of the belt.   3. The conveyor belt according to claim 1, further comprising an identification portion indicating a position of an end of the peeling layer in a belt longitudinal direction on at least one surface of the upper cover rubber and the lower cover rubber.   In the joining method of the conveyor belt which joins the longitudinal direction edge parts of a conveyor belt, the said upper cover rubber and the said lower cover rubber of the longitudinal direction edge part of the conveyor belt in any one of Claims 1-3 are said peeling layers And removing the steel cords, the surfaces of which are covered with the adhesive rubber, by exposing the steel cords at predetermined positions in the longitudinal direction. The steel cords of the core layers at the longitudinal ends of the belts to be joined are inserted between the steel cords on the other side, and then the steel cords of the other side of the opposite steel cord are inserted. Vulcanization with unvulcanized upper cover rubber and unvulcanized lower cover rubber placed on the upper and lower surfaces of the region inserted between Method of joining conveyor belt, characterized in Rukoto.

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