Hits: 21542019-02-28 14:19:16 source: Ever-Power Group|European Standard Pulley|Taper Sleeve|HRC Coupling|Other
The belt pulley drive can alleviate the load impact; the belt pulley drive runs smoothly, with low noise and low vibration; the belt pulley drive has a simple structure and is convenient to adjust; the belt pulley drive is not as strict as the mesh drive for the manufacture and installation of the belt pulley; the belt pulley drive has an overload protection function; The adjustment range of the center distance of the two shafts driven by the belt pulley is relatively large.
The advantages of belt pulley transmission are: belt pulley transmission can alleviate load impact; belt pulley transmission runs smoothly, with low noise and low vibration; belt pulley transmission has a simple structure and easy adjustment; belt pulley transmission is not as strict as mesh transmission for the manufacturing and installation accuracy of pulleys; pulley transmission It has the function of overload protection; the adjustment range of the center distance of the two shafts driven by the belt pulley is large.
The disadvantages of belt drive are: pulley drive has elastic sliding and slippage, low transmission efficiency and can not maintain accurate transmission ratio; when pulley drive transmits the same large circumferential force, the outline size and pressure on the shaft are larger than meshing drive; pulley drive belt The life span is shorter.The diameters and other dimensions of the pulleys of all kinds of mechanical equipment are all configured according to the reduction ratio, and designed according to the working speed and the speed of the motor.
Working speed / motor speed = driving wheel diameter / driven wheel diameter * 0.98 (slip coefficient), such as the use of steel as the material of the pulley, the linear speed is required to be no higher than 40m/s, if the cast iron material is used, the linear speed is required to be no higher than 35m/s, motor speed and pulley diameter conversion ratio, speed ratio = output speed: input speed = load pulley pitch circle diameter: motor pulley pitch circle diameter.The pitch circle diameter is the same as the reference diameter. Diameter -2h = pitch circle diameter. h is the depth of the groove on the reference line. Different types of V belt h are different. For YZABCDE, the groove depth on the reference line is h=1.6 2 2.75 3.5 4.8 8.1 9.6.The pulley pitch circle diameter is the theoretical diameter of the pulley pitch line position, which is a bit like the index circle diameter of a gear.
It is generally represented by PD, and the outer circle is generally represented by OD.The conversion formulas of different groove-shaped pitch circles and outer circles are different. Generally, 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. A or SPA pulley has the smallest outer diameter of 80mm. If it is smaller than this size, especially at high speeds, the belt is prone to delamination and cracks at the bottom. SPZ belt, the small wheel is not less than 63mm.At the same time, pay attention to the method and tension of the belt installation, too small and easy to slip, too large and easy to damage the belt and bearings.