V-belt models are: common type OABCDE3V5V8V, ordinary enhanced type AXBXCXDXEX3VX5VX8VX, narrow V with SPZSPASPBSPC, powerful narrow V-band XPAXPBXPC; each model of the V-belt specifies the cross-sectional dimensions of the V-belt, the cross-sectional size of the A-type V-belt is: Width 13mm, thickness 8mm; B-type V-belt cross-sectional dimensions are : the top width of 17MM, the thickness of 10.5MM; C-shaped V-belt cross-sectional dimensions are: the top width of 22MM, the thickness of 13.5MM; D-shaped V-belt section size Yes : The top width is 21.5 mm, and the thickness is 19 mm. The section size of the E-shaped triangular belt is: the top width is 38 mm, and the thickness is 25.5 mm. Corresponding dimensions (width*height): O(10*6), A(12.5*9), B(16.5*11), C(22*14), D(21.5*19) , E(38*25.5).

    There are three types of belt drives : flat belts, V-belts, and synchronous tooth belts. All three types of belts have national standards. However, belt pulleys have large variations in transmission ratio and power, and there is no national standard or national standard that does not fully correspond. Content, but national standards determine the scope of use, conditions of use, design methods and other content.

    For example, the national standard specifies seven types of V-belts: O, A, B, C, D, E, and F. The corresponding pulley wheel slot angles are three types of 34°, 36°, and 38°. The model V-belt corresponds to the smallest diameter of the small pulley for each groove angle, but the large pulley is not specified. The groove angle of the pulley is divided into 34 degrees, 36 degrees and 38 degrees. The specific choice depends on the groove type and the reference diameter of the pulley. The groove angle of the pulley is related to the diameter of the pulley. The groove angles of the pulleys of different models are different in diameter. The recommended number of pulley groove angles in the range is as follows: The O-type pulley is 34 degrees when the pulley diameter ranges from 50mm to 71mm, 36 degrees when it is 71mm to 90mm, and 38 degrees when it is >90mm; the A-type pulley is the pulley diameter The range is 34 degrees at 71mm to 100mm, 36 degrees at 100mm to 125mm, and 38 degrees at >125mm. The B-type pulley is 34 degrees when the pulley diameter ranges from 125mm to 160mm, and 36 degrees when it is 160mm to 200mm. >200mm when >200mm; C-type pulley is 34 degrees when the pulley diameter ranges from 200mm to 250mm, is 36 degrees when it is 250mm~315mm, and is 38 degrees when >315mm; the D-type pulley is in the pulley diameter range is 355mm~ It is 36 degrees at 450 mm and 38 degrees at >450 mm; 36 degrees at 500 mm to 630 mm for E-shape and 38 degrees for >630 mm.

    The diameter and other dimensions of the pulley are all based on the reduction ratio and are designed according to the working speed and the rotation speed of the motor. Working speed / motor speed = driven wheel diameter / driving wheel diameter * 0.98 (sliding coefficient), such as the use of steel as the material of the pulley, the required line speed is not higher than 40m / s, such as the use of cast iron materials, the required line speed is not higher than 35m/s, conversion ratio of motor rotation speed and pulley diameter, speed ratio = output rotation speed: input rotation speed = load pulley pitch circle diameter: motor pulley pitch circle diameter. The diameter of the pitch circle is the same as the reference diameter, diameter -2h = diameter of the pitch circle, and h is the depth of the groove on the datum line. Different types of V-bands are not the same, YZABCDE, the groove depth in the datum line is h = 1.622. 753.54.88.19.6. The pitch circle diameter of the pulley is the theoretical diameter of the pitch line of the pulley, which is a bit like the pitch circle diameter of the gear. Generally, it is represented by PD, and the outer circle is generally expressed by OD. Different groove pitch circle and outer circle conversion formula is not the same, generally we It is easier to measure the outer circle of the pulley and calculate the pitch circle according to the formula: SPZ:OD=PD+4; SPA:OD=PD+5.5; SPB:OD=PD+7; SPC:OD=PD+9.6. The minimum outer diameter of the pulley of A or SPA is 80mm, if less than this size, especially in the case of high speed, the belt is prone to delamination and cracks at the bottom. SPZ belt, small wheel is not less than 63mm. At the same time pay attention to the belt installation method and tension, too easy to slip, too large and easy to damage the belt and bearings.

     In addition, the standard numbered ISO1081-1995, which is similar to the national standard, specifies the selection and design specifications for belt drives, V-belt and triangular-edge belts, and grooved pulleys. Divided into SPZ, SPA, SPB, SPC, SPD Five Pulleys