A linear module includes: a base, a slide stage, two support frames, two retaining units and a steel belt. With the pivoting freedom given by the guide portions of the retaining units, when the slide stage moves, the rolling elements can be abutted more closely against the contact surface of the steel belt via the pivoting of the guide portions, so as to reduce the occurrence of deformation and clearance produced by the steel belt, which not only improves the sealing performance of the steel belt and operation smoothness of the linear module, but also produces a dust proof effect, thus achieving the purposes of automatically adjusting contact angle, preventing deformation while extending the life of the steel belt.

A metal-rubber composite, comprising a metal and a rubber of which at least a portion is adhered to the metal, the composite is characterized in that: a ratio (C.sub.1/C.sub.2) of the total concentration (C.sub.1) of at least one metal element selected from the group consisting of bismuth, copper, antimony, silver, niobium, molybdenum, zirconium, and nickel in a region within 100 nm measured from an adhesion interface of the metal and the rubber toward the rubber side, with respect to the total concentration (C.sub.2) of at least one metal element selected from the group consisting of bismuth, copper, antimony, silver, niobium, molybdenum, zirconium, and nickel in a region between the 100 nm depth and the 200 nm depth, measured from the adhesion interface toward the rubber side, is 7.0 or larger.

A metal-rubber composite, comprising a metal and a rubber of which at least a portion is adhered to the metal, the composite is characterized in that: a ratio (C.sub.1/C.sub.2) of the total concentration (C.sub.1) of at least one metal element selected from the group consisting of bismuth, copper, antimony, silver, niobium, molybdenum, zirconium, and nickel in a region within 100 nm measured from an adhesion interface of the metal and the rubber toward the rubber side, with respect to the total concentration (C.sub.2) of at least one metal element selected from the group consisting of bismuth, copper, antimony, silver, niobium, molybdenum, zirconium, and nickel in a region between the 100 nm depth and the 200 nm depth, measured from the adhesion interface toward the rubber side, is 7.0 or larger.

Provided are a method for setting the embedding depth of loop coils in a conveyor belt which can enhance the durability of a loop coil without testing a large number of samples, and a method for manufacturing a conveyor belt in which the loop coil is embedded. A two-dimensional or three-dimensional FEM analysis model of an actual conveyor belt is prepared, and the appropriate embedding depth of the loop coils in the actual conveyor belt, i.e., the rubber thickness between the core layer and the loop coils is set on the basis of at least one of a principal stress or a deformation amount occurring in the loop coil in the analysis model when a falling object having predetermined specifications is dropped from above an upper cover rubber in the analysis model onto the upper cover rubber.

Provided are a method for setting the embedding depth of loop coils in a conveyor belt which can enhance the durability of a loop coil without testing a large number of samples, and a method for manufacturing a conveyor belt in which the loop coil is embedded. A two-dimensional or three-dimensional FEM analysis model of an actual conveyor belt is prepared, and the appropriate embedding depth of the loop coils in the actual conveyor belt, i.e., the rubber thickness between the core layer and the loop coils is set on the basis of at least one of a principal stress or a deformation amount occurring in the loop coil in the analysis model when a falling object having predetermined specifications is dropped from above an upper cover rubber in the analysis model onto the upper cover rubber.

Provided are a conveyor belt further enhancing the durability of loop coils embedded in the conveyor belt so as to detect vertical tears in the conveyor belt; and a belt conveyor system using the conveyor belt. A conveyor belt includes a core layer having a plurality of metal cords extending in the belt longitudinal direction arranged in parallel in the belt width direction; an upper cover rubber and a lower cover rubber disposed so as to interpose a core layer from above and below; a plurality of loop coils embedded at intervals in the belt longitudinal direction in the lower cover rubber; and protective layers being disposed between the core layer above and each of the loop coils below and embedded in the lower cover rubber at intervals in the belt longitudinal direction.

The present technology provides a reinforcing layer for a rubber product. A reinforcing layer embedded in a conveyor belt is composed of a plurality of steel cords embedded so as to extend in the belt longitudinal direction side by side in parallel. The outer diameter of the steel cords is not less than 0.35 mm and not greater than 6.0 mm, and the side-by-side pitch is greater than 0.35 mm and not greater than 7.0 mm.

The present technology provides a reinforcing layer for a rubber product. A reinforcing layer embedded in a conveyor belt is composed of a plurality of steel cords embedded so as to extend in the belt longitudinal direction side by side in parallel. The outer diameter of the steel cords is not less than 0.35 mm and not greater than 6.0 mm, and the side-by-side pitch is greater than 0.35 mm and not greater than 7.0 mm.

A conveyor belt including a carry cover layer, a reinforcement layer which is situated below the carry cover layer, and a pulley cover layer which is situated below the reinforcement layer, where the reinforcement layer is comprised of steel cordage and rubber matrix, and wherein the rubber matrix includes zinc oxide in an amount greater than 5 phr. In some cases the rubber the matrix includes zinc oxide in an amount of 11 phr or greater, or even in an amount of 16 phr or greater. In some aspects, the rubber matrix is devoid of lead oxide. In some aspects, the steel cordage is zinc coated steel cords.

A conveyor belt including a carry cover layer, a reinforcement layer which is situated below the carry cover layer, and a pulley cover layer which is situated below the reinforcement layer, where the reinforcement layer is comprised of steel cordage and rubber matrix, and wherein the rubber matrix includes zinc oxide in an amount greater than 5 phr. In some cases the rubber the matrix includes zinc oxide in an amount of 11 phr or greater, or even in an amount of 16 phr or greater. In some aspects, the rubber matrix is devoid of lead oxide. In some aspects, the steel cordage is zinc coated steel cords.