Plum coupling is a kind of elastic coupling. It is widely used in the transmission field of pulverized coal machine. It is widely loved by customers, such as large dosage, simple use and low price.Plum-shaped elastic coupling: The working principle is to install a whole plum-shaped elastic ring between the two claws of the same shape of the half coupling to realize the connection of the two halves of the coupling.The main materials are cast steel and 45# steel; the connection forms include keyway connection, set screw connection, clamping connection, or a combination of two forms of connection.Axial plug-in installation.If radial installation is required, it can be made into a flange type to transmit power through the extrusion between the claws and the elastic ring, and the relative deviation of the two shafts can be compensated by the elastic deformation of the elastic ring to achieve vibration damping and buffering.There are many types to choose from, such as keyway type, clamping type, extended type, flange type and so on.

　　The plum blossom coupling is to install a whole plum blossom-shaped elastic ring between the convex claws of two half couplings with the same shape to realize the connection of the two half couplings.The elastic element of the quincunx elastic coupling is similar to the quincunx shape. The coupling has the characteristics of compensating the relative deviation of the two shafts, damping, and buffering. It has small diameter, simple structure, no lubrication, high load capacity and easy maintenance. Replacement of elastic elements Axial movement, suitable for connecting coaxial lines, frequent starting, forward and reverse changes, medium speed, medium torque and other transmission shaft systems and working parts that require high working reliability.It is not suitable for low-speed, heavy-duty and limited axial dimensions where it is difficult to align the two shafts after replacing elastic elements.The quincunx elastic coupling is processed by machining methods such as turning, milling, and broaching, and then undergoes overall heat treatment to ensure sufficient strength.The quincunx elastic coupling has good balance performance and is suitable for high-speed applications, but it cannot handle large deviations, especially axial deviations.Larger eccentricity and deflection angle will produce a larger bearing load than other servo couplings.Another value of concern is the failure of the quincunx elastic coupling. >Once the plum blossom coupling is damaged or fails, the torque transmission will not be interrupted. At the same time, the metal claws of the two shaft sleeves mesh together to continue to transmit torque, which may cause problems in the system.Choosing the appropriate plum blossom elastic spacer material according to the actual application is a major advantage of this coupling. The different hardness and temperature tolerance allow customers to choose the appropriate material to meet the performance standards of the actual application.

　　Plum couplings are used in CNC machine tools, CNC lathes, processing, engraving machines, CNC milling machines, computer gongs, metallurgical machinery, mining machinery, petroleum machinery, chemical machinery, lifting machinery, transportation machinery, light industry machinery, textile machinery, water pumps, Fans and other industries have a wide range of applications.

　　There are two main types of plum blossom couplings, one is the traditional straight claw type, and the other is the curved (inward) claw type zero-backlash coupling.The traditional straight-jaw plum blossom coupling is not suitable for use in high-precision servo transmission applications.The zero-backlash claw type plum blossom coupling is evolved on the basis of the straight claw type, but the difference is that its design can be suitable for the application of the servo system, and it is often used to connect servo motors, stepping motors and ball screws.The curved surface is to reduce the deformation of the elastic plum spacer and limit the influence of centripetal force on it during high-speed operation.The zero-clearance claw coupling consists of two metal sleeves (usually made of aluminum alloy, stainless steel can also be provided) and a plum blossom elastic spacer.The plum blossom elastic spacer has multiple leaf branches. Like a slider coupling, it also squeezes the plum blossom elastic spacer and the sleeves on both sides to ensure its zero clearance performance.Different from the slider coupling, the plum blossom coupling is driven by squeezing while the slider coupling is driven by shear.When using a zero-clearance claw coupling, the user must be careful not to exceed the large bearing capacity of the elastic element given by the manufacturer (under the premise of ensuring zero clearance), otherwise the plum elastic spacer will be squashed and deformed. The elasticity and the loss of preload will result in the loss of zero-clearance performance, which may be discovered by users only after serious problems occur.

　　The plum blossom coupling is simple in structure, does not require lubrication, is convenient for maintenance, easy for inspection, maintenance-free, and can run continuously for a long time.The high-strength polyurethane elastic elements are wear-resistant and oil-resistant, have large carrying capacity, long service life, and reliability.Stable and reliable work, with good vibration damping, buffering and electrical insulation properties.It has large axial, radial and angular compensation capabilities.The structure is simple, the radial dimension is small, the weight is light, and the moment of inertia is small. It is suitable for medium and high speed occasions.