Time : 2022-01-07 Browse : 15
The coupling is a key component in mechanical transmission that connects two rotating shafts and transmits torque or rotation angle. It can also be damaged first when the equipment is overloaded, playing a role in protecting the motor and other transmission parts. To ensure its stable operation, it is essential to master scientific selection techniques.
I. Selecting the Type According to the Series Characteristics
Each series of couplings has unique performance and needs to be selected according to actual use needs. For example, the gear coupling adapts to deviations and transmits torque with parallel or spiral groove systems, and is widely used in stepping and servo systems; while the diaphragm coupling is suitable for high-precision transmission scenarios with its high rigidity and zero backlash. Clarifying the equipment's requirements for deviation compensation, rigidity, maintenance requirements, etc. is the basis for selecting the right series.
II. Determining the Model by Referring to the Parameter Table
After selecting the series, it is necessary to determine the specific model in combination with the parameter table. The core parameters include:
Torque Parameter:
The rated torque is the allowable torque value actually borne by the coupling, and the maximum torque is the maximum critical value of its damage. When selecting, it is necessary to ensure that the rated torque of the coupling is greater than the maximum torque of the motor; in equipment with frequent forward and reverse rotation, the rated torque should be 2-5 times the maximum torque of the motor, and the servo motor needs 5-10 times to cope with the instantaneous load during starting, stopping and switching.
Speed parameters:
The maximum speed must match the motor speed to ensure that the coupling operates within the safe speed range.
Deviation parameters: including eccentricity (allowable value of parallel deviation of the two axis axes), deflection (allowable value of the mutual angle between the two axes), and axial deviation (allowable value of axial displacement of the two axes). According to the shaft system deviation that may occur during the operation of the equipment, a model with suitable deviation compensation capability should be selected.
III. Determining the Appropriate Fixing Method
A reasonable fixing method is the guarantee of stable operation of the equipment. Common fixing methods include key connection, screw fixing, clamping fixing, etc., which need to be selected according to the shaft diameter size, transmission accuracy requirements and installation convenience. For example, high-precision transmission scenarios often use key connection or clamping fixing to avoid shaft system damage that may be caused by screw fixing.
IV. Checking the On-Site Installation Conditions
The selected coupling must meet the conditions of on-site installation space, disassembly and maintenance convenience, etc. For example, compact couplings are preferred in small spaces; for equipment that requires frequent maintenance, types that are easy to install and disassemble should be considered.
Through the above steps, combined with the actual working conditions and parameter requirements of the equipment, the appropriate coupling can be accurately selected to ensure efficient and stable operation of the mechanical transmission system.
