Working principle and performance analysis of plum blossom coupling

The plum blossom coupling is a common type of coupling, and many people choose it when choosing a coupling. The plum blossom coupling has a simple structure, a small number of parts, a small radial size ratio, and does not require lubrication. The elastic element has good compression bearing capacity. Except for the double flange plum blossom elastic coupling, when replacing vulnerable plum blossom elastic parts, we need to move the half coupling axially, otherwise it will cause replacement failure and position deviation. Although the plum blossom coupling is a small object, it has a large function

The plum blossom coupling has multiple structural forms, a wide range of applications, and a variety of material choices. It is one of the commonly selected models in elastic couplings. The commonly used materials for plum blossom couplings include gray iron, cast steel, and aluminum alloy materials. The plum blossom coupling has a simple structure, does not require lubrication, is convenient for maintenance, inspection, and maintenance free, and can operate continuously for a long time. Polyurethane elastic components are wear-resistant, not afraid of oil, have a large load-bearing capacity, and have a good service life. Stable work, with good vibration damping, buffering, and electrical insulation performance. Has large axial, radial, and angular compensation capabilities. Simple structure, small radial size, light weight, small moment of inertia, suitable for medium applications

Analyze the performance of plum blossom couplings under different conditions

Firstly, transferability: The transferability of a coupling refers to the ability to compensate for the relative displacement of two rotating components.

. Factors such as manufacturing and installation errors between connected components, temperature changes during operation, and deformation under load all require mobility. Compensation for movable performance or additional loads between shafts, bearings, couplings, and other components caused by relative displacement between rotating components

Secondly, it should have sufficient strength and service life

Thirdly, the structure is simple, easy to assemble, disassemble, and maintain

4. Buffering: In situations where the load is frequently started or the working load changes, the coupling should have elastic components that play a buffering and vibration reducing role to protect the original engine and working machine from less or no damage

Working principle of plum blossom coupling:

Firstly, before installation, check whether the two shafts of the prime mover and the working machine are concentric, and whether there are packaging paper and scratches on the surfaces of the two shafts.

. Check if there are any debris in the inner holes of the two half couplings of the plum blossom coupling, and if there are any scratches on the edges of the inner holes. If there are any, clean the shaft and half couplings, and handle the scratches with a fine file. Then check whether the inner hole diameter and length of the two half couplings match the diameter and shaft extension length dimensions of the prime mover and working machine. It is generally recommended to make the length of the half coupling between the prime mover and the working machine less than 10-30mm of its shaft extension length during selection

2. Alignment: Use a dial gauge to check the end face and outer circle runout of the two half coupling flange plates. When the outer circle of the flange plate is less than 250mm, the runout value should not exceed 005mm; When the outer circle of the flange is greater than 250mm, the runout value should not exceed 008

3. Installation of bolts: Thread the bolts into the small holes on the flange and out of the large holes on another piece of flange. Install buffer sleeves, elastic washers, and tighten the nuts with a wrench. If the installation is uncomfortable or removed for replacement, without damaging the shaft and half joint, it is best to rotate freely without any other force after installation

4. Practice has proven that if the installation, maintenance, and operation of the plum blossom coupling are carried out according to the instructions and requirements, and the daily starting frequency is 15 times, the service life of the coupling is more than 5 years. If the installation, maintenance, and operation are not carried out according to the instructions, especially if the bolt direction is installed incorrectly, causing deformation of the coupling or excessive deviation of the shaft center between the prime mover and the working machine, the coupling will be damaged in advance

5. For ease of installation, the two half couplings are preheated in a 120150 insulation box or oil tank to increase the size of the inner hole and make it easy to install. After installation, the shaft head should not protrude from the end face of the half coupling, and it is better to be flush. Measure the distance between the two half couplings: Take the average reading of 34 points along the inner sides of the flange of the half coupling, and the sum of the measured dimensions of the extension and the two diaphragm groups. The error between the two should be controlled within the range of 0-04mm

6. Operator's Notice: Before starting the equipment, the nut of the plum blossom coupling should be checked for looseness or detachment. If so, the nut should be tightened with a wrench in a timely manner. The load pipeline valve should be opened after starting the equipment with no load for 1 minute; The shutdown sequence is reversed. (Please apply oil to the outside of the coupling once a month.)