To determine whether the concentricity of the transmission shaft meets the requirements, a comprehensive evaluation is mainly based on relevant standards and specifications and actual measurement data. The following are the specific judgment methods:
Refer to the equipment technical documents : Different equipment has different requirements for the transmission shaft concentricity. Generally, the allowable concentricity deviation range will be clearly given in the equipment installation instructions, technical specifications or design drawings. For example, for a ZSY250 reducer, its technical documents may specify that the allowable radial runout between the drive shaft and the reducer shaft is ±0.05mm and the allowable axial rush momentum is ±0.1mm. During the installation and commissioning process, these specified values should be strictly determined to determine whether the concentricity meets the requirements.
Use measurement tools to detect
Dial meter measurement : As mentioned above, use a dial meter to rotate around the circumference of the transmission shaft for one week to record the maximum and minimum readings of the pointer. The difference between the two is the radial jump value of the transmission shaft. If this value is within the range specified in the equipment technical documents, it means that the concentricity of the transmission shaft basically meets the requirements in the radial direction. At the same time, the axial momentum of the transmission shaft can also be measured through a dial meter. The method is to press the dial meter head vertically on the shaft end surface of the transmission shaft, then push and pull the transmission shaft, observe the swing range of the dial meter pointer, so as to judge whether the axial concentricity meets the requirements.
Laser centering instrument measurement : The laser centering instrument can directly measure the concentricity deviation value between the transmission shaft and the connecting parts (such as the reducer shaft), including radial deviation and angular deviation. During measurement, the transmitter and receiver of the laser centering instrument are installed on the drive shaft and the corresponding connecting shaft ends respectively, and the instrument will automatically display the concentricity deviation data of the two axes. If these data are within the tolerance allowed by the device, it means that the concentricity meets the requirements. Generally speaking, for equipment with high accuracy requirements, the concentricity deviation measured by the laser centering instrument should be controlled within ±0.03mm.
Observe the operating status of the equipment : During the trial operation of the equipment, observing the operating status of the equipment can also help judge the concentricity of the transmission shaft. If the concentricity of the drive shaft does not meet the requirements, it may cause abnormal vibration of the equipment, increase noise, and bearing heating. For example, when the concentricity deviation is large, an unbalanced force will be generated during rotation of the transmission shaft, causing the overall vibration of the equipment, and the vibration frequency is related to the speed of the transmission shaft. In addition, due to poor concentricity and uneven loads under the bearings will cause the bearing to heat up, which may cause bearing damage in severe cases. If these abnormalities occur in the equipment, the machine should be shut down in time to check the concentricity of the transmission shaft.
Comparative experience value : In the absence of clear equipment technical documents or measurement tools, you can refer to the general experience value of the same type of equipment or industry for preliminary judgment. For example, for general industrial transmission equipment, it is more appropriate to control the concentricity deviation of the transmission shaft in the range of 0.1 - 0.2mm. However, this method is relatively inaccurate and is only suitable for situations where preliminary judgments or low requirements for concentricity are required.
In practical applications, it is recommended to use the above methods in a comprehensive manner to accurately determine whether the concentricity of the transmission shaft meets the requirements. Especially for key equipment or transmission shafts with high concentricity requirements, they should be strictly followed by the requirements of the equipment technical documents, and should be inspected with accurate measurement tools, and closely observed during the operation of the equipment to ensure that the concentricity of the transmission shaft is always in a good state and ensure the safe and stable operation of the equipment.
