① First determine the width and thickness of the belt.
②Then determine the inner circumference. Method: Use a thin rope to surround the path of the belt (that is, the groove of the belt pulley) to measure the length, and the data is the inner circumference of the belt. This data + the thickness of the belt is the required belt length. Due to the measurement error, the exact match shall prevail.
Application: Widely used in automobile, industry, household appliances, agricultural equipment, etc.

Installation instructions: When installing the belt, you should first loosen one side of the sheave, adjust it to a position where the belt can be easily installed, and then tighten it after installing the belt easily (for the first installation of the belt, the belt should be tensioned as much as possible, and it should run for 24 hours after starting the machine). Do not use tools to forcibly pry in the belt or use the pulley to forcibly reel in the belt. Forcibly installing the belt will damage the belt strength layer and make the belt unable to use normally. The parallelism of the shaft and pulley is calibrated while the belt is tensioned.
Reference length: When the V-belt rotates and bends around the pulley, the layer whose length and width remain unchanged is called the neutral layer. Under the specified tension, the perimeter measured along the neutral layer of the V-belt is called the reference length Ld, also known as the nominal length. It is mainly used for the calculation of the geometric dimension of the belt drive and the marking of the V-belt, and its length has been standardized. In addition, the length of the domestic triangle belt is also expressed by the inner circumference and the outer circumference.

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