I would like to ask the teacher: what is the diameter of the pulley of the motor?
According to the unit time, the principle of the tangent of the tangent of the pulley: The diameter of the main belt wheel/from the diameter of the belt wheel = from the pulley speed/main pulley speed So the main pulley diameter = 77 * 70/2840. Is there no necessary relation between the length of belt and pulley, the market standard option is greater than or equal to: 2 * (the main pulley circumference + from the pulley circumference), unless you are custom.
If huanggui5200 say, you which main from data is wrong, should 3.8 mm, be you in the video recorder? The pulley diameter is small, the belt is bent, and the friction factor is not enough. The exact length should also be calculated, but the calculation is a little complicated. You can also calculate roughly, for example, in half a bag. There are three parts: 1) the main pulley is half the circumference; 2) half of the pulley; 3) twice the distance between the pulley, this is a triangulation problem, which should be equal to 4,600 square + the radius of the pulley, the square root of the radius of the pulley.
B: yes. The belt length cannot be smaller than the circumference of the main pulley, otherwise the two pulley can be touched. There is a standard in the general market, which is greater than 2 times the circumference of the pulley, and it can be longer, but it is not necessary unless it is needed.
