A conveyor belt assembly may include a conveyor belt having an elastomeric layer, a chain adjacent a side edge of the conveyor belt and a flexible bridge extending between and connected to the chain and the conveyor belt along the side edge. The chain, bridge and conveyor belt may be driven to revolve by a sprocket engaging the chain.

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.

A conveyor belt (13A) includes a main body rubber (14) which extends in a belt longitudinal direction L and a loop coil (15A) which is embedded in the main body rubber (14) and has an annular shape in a plan view when viewed in belt thickness direction, in which the loop coil (15A) includes a plurality of wire portions (151) which are disposed in a direction which annularly extends in the plan view and in which end portions are joined to each other via a joining portion (152), a pair of longitudinal portion (15a and 15a) which extend in the belt longitudinal direction (L), and a pair of width portions (15b and 15b) which extend in a belt width direction, and a plurality of joining portions (152) are disposed in the direction which annularly extends in the plan view, and the number of the joining portions disposed in the longitudinal portion (15a) of the loop coil (15A) is greater than the number of the joining portions disposed in the width portion (15b) of the loop coil (15A).

A conveyor belt (13A) includes a main body rubber (14) which extends in a belt longitudinal direction L and a loop coil (15A) which is embedded in the main body rubber (14) and has an annular shape in a plan view when viewed in belt thickness direction, in which the loop coil (15A) includes a plurality of wire portions (151) which are disposed in a direction which annularly extends in the plan view and in which end portions are joined to each other via a joining portion (152), a pair of longitudinal portion (15a and 15a) which extend in the belt longitudinal direction (L), and a pair of width portions (15b and 15b) which extend in a belt width direction, and a plurality of joining portions (152) are disposed in the direction which annularly extends in the plan view, and the number of the joining portions disposed in the longitudinal portion (15a) of the loop coil (15A) is greater than the number of the joining portions disposed in the width portion (15b) of the loop coil (15A).

A conveyor belt comprising a first longitudinal belt portion and a second longitudinal belt portion having respective transport surfaces with coefficients of friction different from each other.

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.

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.

A conveyor belt includes a core layer disposed between an upper cover rubber layer and a lower cover rubber layer. The core layer is configured from a plurality of steel cords covered by cushioning rubber and arranged in parallel. The rubber that forms the lower cover rubber layer is a low loss rubber that has a loss factor tanδ of 0.07 or less at a frequency of 10 Hz, 2% dynamic strain, and temperature of 20° C. The maximum thickness of the cushioning rubber is reduced to not more than ⅓ the nominal diameter of the steel cords.

A conveyor belt includes a core layer disposed between an upper cover rubber layer and a lower cover rubber layer. The core layer is configured from a plurality of steel cords covered by cushioning rubber and arranged in parallel. The rubber that forms the lower cover rubber layer is a low loss rubber that has a loss factor tanδ of 0.07 or less at a frequency of 10 Hz, 2% dynamic strain, and temperature of 20° C. The maximum thickness of the cushioning rubber is reduced to not more than ⅓ the nominal diameter of the steel cords.

A method for adhering together rubbers to be adhered including a rubber composition containing an ethylene-α-olefin copolymer, an organic peroxide (X1), and carbon black (Y1), using a rubber for adhesion including a rubber composition containing an ethylene-α-olefin copolymer, an organic peroxide (X2), and carbon black (Y2) at an adhesive interface, wherein contents of the organic peroxide (X1) in the rubber to be adhered and the organic peroxide (X2) in the rubber for adhesion are predetermined contents, and a content ratio (X2/X1) of the organic peroxide (X2) to the organic peroxide (X1) is from 1.20 to 2.00.