Abstract: A wear testing method includes setting a rotational speed of a rotary drum with a rubber sample attached to an outer surface thereof to a desired speed; setting a pressing load imparted by a contact member to a desired pressing load via a weight member; selecting as the contact member a desired contact member from a plurality of contact members with varying specifications for a contact surface that comes into contact with the surface of the rubber sample; attaching an arm portion that composes a pressing mechanism; rotating the rotary drum; and pressing the contact member against the surface of the rubber sample with the contact member being moveable in a tangent line direction of a rotation direction of the rotary drum, and detecting an amount of displacement in a pressing direction of the contact member pressing against the surface of the rubber sample via a displacement sensor.

Abstract: A method of recognizing a conveyor belt wear condition is provided. Relationships between an apparent compressive stress in a wear resistance test and surface roughness of a sample and between the surface roughness and amount of wear per unit frictional energy of the sample are acquired. A wear condition of an upper cover rubber is recognized based on an apparent compressive stress generated on the upper cover rubber at a use site, and a database is created based on the relationships. Alternatively, relationships between an average wear pitch calculated from the surface roughness and viscoelastic properties of the sample and between the average wear pitch and an actual amount of wear of the sample are acquired. A wear condition of the upper cover rubber is recognized based on the viscoelastic properties of the upper cover rubber of the use site and a database is created based on the relationships.

Abstract: Provided is a conveyor belt. The upper cover rubber has a configuration in which a wear resistance layer and an impact resistance layer are layered in this order from an outer peripheral side of the conveyor belt. The wear resistance layer has a loss coefficient of from 0.03 to 0.25 and a loss elastic coefficient of from 0.20 MPa to 6.50 MPa at 20° C. The impact resistance layer has a loss coefficient of from 0.15 to 0.70 and a loss elastic coefficient of from 1.5 MPa to 30.0 MPa at 20° C.

Abstract: Provided is a conveyor belt monitoring system that determines whether or not an abnormality has occurred in the conveyor belt by successively detecting elongation of a running conveyor belt using an elongation detection mechanism, by successively detecting tension acting on a core layer forming the conveyor belt using a tension detection mechanism, and, on the basis of data obtained therefrom, monitoring the presence/absence of the abnormality in the conveyor belt using a control unit.

Abstract: An impact test method and an impact test device is provided, wherein an impact application member is caused to fall freely onto a test sample placed on a placement platform. When the impact application member collides with the test sample, an impact force applied to the test sample and an indentation amount of the impact application member with respect to the test sample are measured by a load meter and a displacement meter, respectively. Based on the measured impact force and the measured indentation amount, a calculation unit calculates energy loss absorbed by the test sample when the impact application member and the test sample collide with each other.

Abstract: According to the present technology, an impact test in which an impact application member is made to free fall onto a test sample of a plurality of types of rubbers having different physical properties is performed under prescribed test conditions; data for at least one of three items including a loss energy that is absorbed by the test sample when the impact application member collides with the test sample, a thermal energy that is generated at the test sample, and an indentation amount into the test sample by the impact application member is acquired; and an optimal test sample is selected from the respective test samples on a basis of a ranking of the superiority of the respective test samples with respect to the item(s) for which data was acquired.

Abstract: A method of recognizing a conveyor belt wear condition is provided. Relationships between an apparent compressive stress in a wear resistance test and surface roughness of a sample and between the surface roughness and amount of wear per unit frictional energy of the sample are acquired. A wear condition of an upper cover rubber is recognized based on an apparent compressive stress generated on the upper cover rubber at a use site, and a database is created based on the relationships. Alternatively, relationships between an average wear pitch calculated from the surface roughness and viscoelastic properties of the sample and between the average wear pitch and an actual amount of wear of the sample are acquired. A wear condition of the upper cover rubber is recognized based on the viscoelastic properties of the upper cover rubber of the use site and a database is created based on the relationships.

Abstract: The present technology provides an impact test device and method. The rotational speed of a rotary drum with a rubber sample attached on the outer surface is set to a desired rotational speed, the impact cycle for the surface of the rubber sample of the contact member by the repeat-impact mechanism is set to a desired cycle, the impact load by the contact member is set to a desired impact load by a weight member, a desired contact member is selected from among the plurality of contact members with different specifications, and the contact member is repeatedly made to collide with the surface of the rubber sample by rotating a vertical excitation roller and pivoting the arm portion in the vertical direction with a rotation shaft.

Abstract: The present technology provides a conveyor belt. An upper cover rubber and a lower cover rubber are respectively disposed above and below a core layer so as to sandwich the core layer, which core layer is composed of a plurality of steel cords extending 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 P of the steel cords is greater than 0.35 mm and not greater than 7.0 mm. The steel cords are embedded extending in the longitudinal direction of the conveyor belt.

Abstract: Provided is a conveyor belt wear monitoring system including a non-contact sensor arranged facing a surface of an upper cover rubber. A distance to the surface of the upper cover rubber is detected using the non-contact sensor in a predetermined range in a belt width direction of the upper cover rubber of the traveling conveyor belt. An amount of wear of the upper cover rubber is obtained by comparing the detection data with pre-stored reference data.

Abstract: A method of manufacturing a coating is provided, which includes applying a primer paint on a substrate, wherein the primer paint includes 100 parts by weight of a first PVF, 30-70 parts by weight of an assistance resin, 5-30 parts by weight of a curing agent, 100-120 parts by weight of a first latent solvent, 3-methoxy-3-methyl-1-butanol, and water. The first latent solvent, 3-methoxy-3-methyl-1-butanol, and water have a weight ratio of 60:10-20:40-60. The method also applies a finish paint on the primer paint, wherein the finish paint includes 100 parts by weight of a second PVF, 100-120 parts by weight of a second latent solvent, 3-methoxy-3-methyl-1-butanol, and water, wherein the second latent solvent, 3-methoxy-3-methyl-1-butanol, and water have a weight ratio of 50:10-20:30-60. The primer paint and the finish paint are baked and dried to form a coating.

Abstract: 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.

Abstract: Provided is a conveyor belt. The upper cover rubber has a configuration in which a wear resistance layer and an impact resistance layer are layered in this order from an outer peripheral side of the conveyor belt. The wear resistance layer has a loss coefficient of from 0.03 to 0.25 and a loss elastic coefficient of from 0.20 MPa to 6.50 MPa at 20° C. The impact resistance layer has a loss coefficient of from 0.15 to 0.70 and a loss elastic coefficient of from 1.5 MPa to 30.0 MPa at 20° C.

Abstract: An abrasion tester and testing method. The testing method comprises setting a running speed of a rubber sample fixed to an outer surface of an annular belt member stretched between a pair of pulleys to a desired speed; setting a pressing load applied by a contact member to a desired pressing load via an anchor member; selecting, as the contact member, a desired contact member from a plurality of types of contact members with different rubber sample surface contacting tip specifications; pressing the contact member against the surface of the rubber sample running by the rotation of the pulleys; and obtaining an amount of scratch abrasion of the rubber sample using a calculation unit on the basis of a cross-sectional shape of the surface of the rubber sample detected by a shape sensor.

Abstract: A method of manufacturing a bi-layered coating is provided, which includes applying a primer paint on a substrate, wherein the primer paint includes 100 parts by weight of a first polyvinyl fluoride, 20 to 50 parts by weight of an assistance resin, and 150 to 170 parts by weight of a first latent solvent, and wherein the assistance resin is polyester modified epoxy resin, polyester type polyurethane resin, phenoxy resin, or a combination thereof. The primer paint is baked and dried to form a primer coating. A finish paint is then applied onto the primer coating, wherein the finish paint includes 100 parts by weight of a second polyvinyl fluoride and 120 to 150 parts by weight of a second latent solvent. The finish paint is baked and dried to form a finish coating on the primer coating.

Abstract: A method of recognizing a conveyor belt wear condition is provided. Relationships between an apparent compressive stress in a wear resistance test and surface roughness of a sample and between the surface roughness and amount of wear per unit frictional energy of the sample are acquired. A wear condition of an upper cover rubber is recognized based on an apparent compressive stress generated on the upper cover rubber at a use site, and a database is created based on the relationships. Alternatively, relationships between an average wear pitch calculated from the surface roughness and viscoelastic properties of the sample and between the average wear pitch and an actual amount of wear of the sample are acquired. A wear condition of the upper cover rubber is recognized based on the viscoelastic properties of the upper cover rubber of the use site and a database is created based on the relationships.

Abstract: Provided is a conveyor belt monitoring system that determines whether or not an abnormality has occurred in the conveyor belt by successively detecting elongation of a running conveyor belt using an elongation detection mechanism, by successively detecting tension acting on a core layer forming the conveyor belt using a tension detection mechanism, and, on the basis of data obtained therefrom, monitoring the presence/absence of the abnormality in the conveyor belt using a control unit.

Abstract: A coating rubber composition for a conveyer belt, comprising 15 to 75 parts by mass of carbon black having a nitrogen adsorption specific surface area of 50 m2/g or less, 25 to 100 parts by mass of calcium carbonate and 40 parts or less by mass of an oil per 100 parts by mass of blended rubber comprising of natural rubber and at least one of either butadiene rubber or SBR. The above coating rubber composition for conveyer belts can improve not only the peel force which is a criterion of adhesiveness with the canvas cloth but also the power-saving capability of the conveyer belt while maintaining the durability thereof. Further, compounding of silica in an amount of 5 to 20 parts by mass can achieve a sufficient rubber attachability onto the canvas cloth when over-vulcanized, while maintaining the peel force when subjected to normal vulcanization.

Abstract: Provided is a conveyor belt wear monitoring system capable of determining the wear condition of an upper rubber cover of a conveyor belt. When the conveyor belt is stopped, on the return side of the conveyor belt, a wear detector with a sensor unit corresponding to an upper cover rubber is disposed, the wear detector is controlled by a control unit to move across an entire length in a belt width direction and the distance from the sensor unit and a surface of the upper cover rubber is detected, the detected data is received by a calculation unit, and an amount of wear of the upper cover rubber is calculated on the basis of the received data.