1.Vibration source

Through analysis and research and related data, it can be known that there are three main aspects that cause the vibration of PU timing belt transmission:

(1) Incorrect manufacturing and installation, including: ①Eccentricity and poor matching caused by improper processing of the center hole of the belt pulley and the taper sleeve on the shaft; ②Eccentricity caused by the improper processing size of the taper sleeve and the shaft.

(2) The design is unreasonable, including: ① The actual working conditions of the pulley are different from the design working conditions, such as the fan working near the first or second critical speed for a long time; ② The design strength of the foundation structure is not the same.

(3) Vibration caused by other factors: ①The belt is too worn and too loose or the belt is installed too tight; ②The long-term operation of the equipment causes the shaft to be slightly bent or the hub is worn and deformed; ③The anchor bolts are loose; ④Nearby vibration The secondary resonance caused by the source.

2.Vibration analysis

Most rotating equipment has undergone dynamic and static balance tests and test runs before leaving the factory. Vibration occurs when it is used for a period of time or at the beginning of installation. The main reason is poor alignment or weak foundation during installation or disassembly. Unstable operation and poor alignment are the main factors. Common angular misalignment, parallel misalignment, a combination of two misalignments, and misaligned bearings are installed on the shaft.