Plate Couplings

The plate coupling consists of a laminated diaphragm group of stainless steel thin plates, high-strength bolts, and two half couplings. The core principle is to compensate for the axial, radial, and angular displacements of the two axes through the elastic deformation of the diaphragm, which is suitable for high-precision transmission scenarios.

According to the number of membranes, plate couplings can be divided into:

1. Single membrane coupling: suitable for mild deviation compensation (≤ 1.5 ° angular deviation), with a simple structure but weak eccentricity adaptability.
   

2. Double diaphragm coupling: Through the collaborative deformation of two sets of diaphragms, it can simultaneously compensate for multi-directional deviations and has stronger load-bearing capacity. It is commonly used in high-power transmission systems such as fans and compressors.

Performance advantage

1. Non lubrication design: The metal diaphragm is maintenance free, resistant to oil stains, acid and alkali corrosion, and suitable for temperatures ranging from -80 ℃ to 300 ℃.
   

2. High transmission efficiency: The torque transmission efficiency reaches 99.86%, with no rotational clearance, and is precisely suitable for servo systems.
   

3. Vibration reduction and noise reduction: The diaphragm flexibly absorbs vibration, reduces bearing load, and reduces noise by more than 90% compared to gear couplings.
   

4. Compact and lightweight: The combination of aluminum alloy wheels and stainless steel diaphragms reduces weight by 30% to 50% compared to traditional couplings.

Application field

1. High speed heavy load: generator set, steam turbine (speed up to 6000r/min, torque up to 8.1 million Nm).
   

2. Harsh environment: chemical pumps, petroleum machinery (corrosion-resistant), aviation engines (high-temperature resistant).
   

3. Precision transmission: CNC machine tools, printing machinery (zero backlash, angular compensation ± 1.5 °).

Selection criteria:

1. Select the number of diaphragm groups based on torque and speed (e.g. JMI type for medium torque, JZM type for heavy machinery).
   

2. J1 type is preferred for shaft hole matching to ensure interchangeability.

Installation specifications:

1. The bolts need to be tightened in stages in diagonal order (1/4 torque first, then 1/2, and finally full torque).
   

2. Gap control: The gap between the diaphragm and the flange is 0.2-0.3mm, and the axial deviation is ≤ 1mm.

Maintenance and Fault Prevention

1. Regular inspection: Check for loose bolts and membrane deformation every 500 hours, and shut down for calibration if there is any abnormal vibration.
   

2. Extended lifespan: Coating the surface of the membrane with molybdenum disulfide lubricant can reduce micro motion wear.
   

3. Typical faults:
   Abnormal noise: Often caused by excessive axial displacement or loose bolts, requiring re centering.
   Diaphragm fracture: caused by long-term overload or fatigue, it is recommended to replace it with a higher strength material. 

Plate couplings with their high reliability and environmental adaptability, are gradually replacing toothed and elastic couplings and becoming the preferred solution for modern industrial transmission. Proper selection and installation are the key to maximizing its performance. It is recommended to consult professional manufacturers for customized design based on specific working conditions.