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Characteristics and precautions of plum blossom elastic coupling

The plum blossom coupling has a large allowable torque range and a high allowable speed, which can meet the 

connection purpose of the high-speed end of the ordinary belt conveyor drive device, and is also suitable for belt 

conveyors in ports with forward and reverse rotation requirements and frequent starts. The machine has good 

adaptability. The middle elastomer is made of polyester-type polyurethane, a new polymer material with good 

shock absorption and wear resistance, so the vibration noise is small during operation, the contact part between 

the elastomer and the half coupling is small, and it is safe and reliable to use, with almost no Fault.

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The plum blossom coupling has good balancing performance and is suitable for high-speed applications (the 

maximum speed can reach 30,000 rpm), but it cannot handle large deviations, especially axial deviations. High-

strength polyurethane elastic components are wear-resistant and oil-resistant, have large load-bearing capacity, 

long service life, and are safe and reliable. It works stably and reliably, and has good vibration reduction, buffering 

and electrical insulation properties. Larger eccentricities and deflection angles produce greater bearing loads than 

other servo couplings. Another issue worth paying attention to is the failure of the plum blossom coupling. Once 

the plum blossom elastic spacer is damaged or fails, the torque transmission will not be interrupted. At the same 

time, the metal claws of the two bushings are meshed together to continue to transmit torque, which is likely to 

cause problems in the system.

Disassembly of coupling connecting bolts

Disassemble the coupling bolts. Due to the deposit of a layer of grease, corrosion products and other sediments 

on the thread surface, the bolts are difficult to disassemble. Especially for severely corroded or damaged bolts, 

disassembly is very difficult. To disassemble the connecting bolts, you should first select the appropriate tool. 

Generally, a torx wrench of the corresponding size should be selected according to the specifications of the bolt. 

If it is a hexagonal bolt, an hexagonal wrench of the corresponding size should be used. A wrench of matching size 

can move upward when tightening or loosening the bolt, and will not easily cause slipping. This should be paid 

attention to especially for small-sized bolts.

For bolts that have been rusted or have a lot of grease, they are often washed with a solvent (kerosene or hot alkaline 

water), and then soaked in cotton gauze in the kerosene, and then placed at the joint between the bolt and the nut to 

allow the kerosene to penetrate into the threads. Easier to disassemble.

If you still cannot remove the bolts, use heating. The heating temperature is generally below 200C. By heating, the gap 

between the nut and the bolt is enlarged, and the rust is easy to fall off, making it easier to disassemble the bolt.

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Coupling application areas

Plum blossom coupling application areas: fans, water pumps, textiles, etc. can be used when the work is stable and the 

load changes not much, crushers, hoists, linear mechanical equipment, cleaning equipment, metallurgical machinery, 

mining machinery, petroleum machinery, chemical machinery, lifting Machinery, transportation machinery, light industrial 

machinery, textile machinery, water pumps, etc.


Contact: Spark Wang

Phone: 86-19932127135

E-mail: admin@rongxingcoupling.com

Add: North side of Planning 4th Road, Southern Industrial New Town, Jizhou District, Hengshui City, Hebei Province, China