Timing Belt Crack and Elongation Failure Traceability and Tension Calibration Process, Based On GB/T 11361

Abnormal wear of timing belts in automatic handling and sorting stations is usually attributed to quality defects. According to Chilok after-sales data, 83% belt fractures are caused by improper installation rather than material defects. Steel cord and glass fiber belts require differentiated tension parameters, otherwise it will cause tooth fatigue crack and irreversible elongation. This article puts forward practical calibration specifications based on GB/T 11361-2022.

1. Differentiated Failure Characteristics Of Two Core Structures

1. Glass fiber core belt: Main failures include surface crack and tooth shedding, rarely overall elongation; vulnerable to lateral shear damage despite excellent heat resistance;

2. Steel cord core belt: Main failures include body elongation and positioning step loss; caused by excessive initial tension leading to irreversible steel wire plastic deformation.

2. Standard Cold-state Tension Calibration Parameters(23℃)

Abandon empirical tension adjustment, adopt vibration frequency calibration for mass production workshops:

3. Irreversible Failure Judgment Standard

1. Radial cracks on tooth root: Irreversible fatigue damage, mandatory replacement to avoid sudden fracture;

2. Steel cord belt elongation >1.2%: Internal lattice deformation, tension calibration invalid, direct scrapping;

3. Uniform unilateral tooth wear: Pulley parallelism deviation exceeds 0.3mm, calibrate pulley firstly before belt replacement.