What is the size of the belt wheel?
The diameter of the pulley is self-designed according to the speed and speed of the motor. Work speed/motor speed driven wheel diameter/active wheel diameter * 0.98 = (sliding coefficient), such as using steel belt pulley for materials, for linear velocity is not higher than 40 m/s, such as the use of cast iron material, require linear velocity is not higher than 35 m/s, motor speed and pulley diameter conversion ratio, speed ratio = output rotational speed, input speed = load pulley pitch diameter, pitch circle diameter of the motor pulley. Pitch diameter and benchmark is the same diameter, diameter - 2 h = pitch diameter, h is on the line groove depth, different models of V belt h is not the same, A B C D E, Y, Z line groove depth respectively in 2 h = 1.6 1.6 3.5 4.8 8.1 2.75. Pulley pitch diameter is pulley diameter section line theory, a bit like gear pitch circle diameter. Generally expressed in PD, cylindrical generally expressed in OD. Different type slot pitch circle and cylindrical conversion formula is different, generally we tend to measure to the pulley cylindrical, in according to the formula to calculate the pitch circle. SPZ: OD = PD + 4; SPA: OD = PD + 5.5; .spb: OD = PD + 7; SPC: OD = PD + 9.6. The minimum diameter of A or SPA is 80mm, if it is less than that, especially at high speed, the belt is prone to cracks and cracks in the bottom. The SPZ band, the small wheel is not less than 63mm. Also pay attention to the belt mounting technique and the tension, too small and easy to slip, too big to damage the belt and bearing.
In addition to the standard number is similar to national standard of ISO 1081-1995 standard rules on the conveyor belt, v-belt and triangular edge belt, and the selection of grooved pulley, the design specification. It is divided into SPZ, SPA, SPB, SPC, and SPD type 5 pulley.
According to the arrangement of the belt grooves from small to large, the model of the triangle tape is: O, A, B, C, D, E, F7, and the power of each piece of adhesive tape is arranged in this arrangement. They trough Angle is divided into 34 degrees, 38 degrees, 38 degrees of three, is considering the lateral deformation of belt on the pulley to produce (triangle tape section groove Angle unification of 40 degrees).
Standard regulations of the state, for example, the v-belt type O, A, B, C, D, E, F, seven kinds of models, there are three kinds of corresponding pulley wheel groove Angle 34 °, 36 °, 38 °, and rules for each triangle model corresponding to the minimum diameter of each small pulley groove Angle, but the big pulley provisions have been made. The grooves of the pulley are 34 degrees, 36 degrees and 38 degrees, depending on the groove and base diameter of the belt wheel. The pulley groove Angle related to the diameter of the pulley, different models of belt pulley groove Angle under different diameter range recommended number of pulley groove Angle is as follows: O pulley on the pulley in 50 mm to 71 mm diameter range is 34 degrees; At 71mm ~ 90mm, it is 36 degrees, > 90mm is 38 degrees. A type A pulley is 36 degrees for the wheel diameter of 71mm to 100mm, and for 100mm ~ 125mm. > 125 mm is 38 degrees; The type B pulley is 34 degrees in diameter from 125mm to 160mm. 160mm ~ 200mm is 36 degrees, > 200mm is 38 degrees; The c-type pulley is 34 degrees in diameter between 200mm ~ 250mm, 36degree for 250mm ~ 315mm, and 38 degrees for > 315mm. The d-type pulley is 36 degrees in diameter from 355mm to 450mm, and 38 degrees for > 450mm. The E type 500mm ~ 630mm is 36 degrees, > 630mm is 38 degrees.
