Shaanxi LMD plum-shaped elastic coupling

The LMD plum blossom-shaped elastic coupling is mainly composed of two protruding teeth that are closely meshed and subjected to radial compression to transmit torque. When the two axes are relatively offset, the elastic element undergoes corresponding elastic deformation, which plays a role of automatic compensation.

There are two main types of LMD plum blossom elastic couplings, one is the traditional straight claw type, and the other is the curved (inward) claw type zero-clearance 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 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.

LMD typePlum-shaped elastic couplingThe measurement of the end face gap and the selection of reference standards should be selected during the assembly process of the plum-shaped elastomer coupling to avoid amplifying measurement errors.The measurement standard of the motor half-coupling generally selects the joint surface of the motor and the connecting plate, and the measurement standard of the reducer half-coupling generally selects the joint surface of the connecting cover and the connecting plate.The end face clearance adjustment of the plum-shaped elastic body coupling, the axial clearance of the half coupling δ=b-(am).

among them:

a. It is the distance between the joint surface of the motor and the connecting plate and the bottom surface of the motor half coupling.

b. It is the distance between the joint surface of the connecting cover and the connecting plate and the top surface of the reducer half coupling (coupling). m is the thickness of the connecting plate.At the same time, when assembling the motor half coupling, consider the distance t between the step of the motor output shaft end and the bottom surface of the motor half coupling, because the t value is a direct factor that affects the assembly position of the half coupling. Regardless of the following adjustment method Whether to increase the distance pad or to process the inner end face of the half coupling, the purpose is to adjust the t value.

LMD quincunx-shaped elastic coupling is to install an integral plum-shaped elastic ring between the protruding claws of two half-couplings of the same shape to realize the connection of the two halves of the coupling.The power is transmitted through the extrusion between the protruding pawl and the elastic ring, and the relative deviation of the two shafts is compensated by the elastic deformation of the elastic ring to realize damping and buffering.This kind of coupling has been standardized, GB/T5272-2002 has five structural forms: LM type (basic type), LMD type (single flange type), LMS type (double flange type), LMZ-I type ( Split brake wheel type) and LNZ-II (full brake wheel type).There are 14 specifications for each type. The applicable shaft hole diameter d=12-160mm, the shaft hole length L=35-135mm, and the nominal torque T=25-25000N. m, allowable speed [n]=1500-15300r. min.

LMD plum blossom-shaped elastic coupling is widely used in coal mine equipment, and the adjustment of the end face clearance of its assembly directly affects the effect of the motor's transmission torque.Proper end face clearance can prevent the elastic cushion from losing its cushioning effect and causing the motor or reducer to overheat.The relevant standards stipulate that the end face clearance of the coupling assembly is 2~4mm.

Since the supply of spare parts for repairs is not produced by the same manufacturer, the size of the coupling is slightly different. If the end face clearance of the coupling assembly is not accurately measured before assembly to determine the assembly position, it will likely lead to rework, and in the case of high torque transmission The coupling and the shaft have an interference fit, which makes it difficult to rework.Here, taking the plum-shaped elastomer coupling used in the double-chain scraper transfer machine in SZZ800/250 as an example, the method of adjusting the end face gap of the plum-shaped elastomer coupling is briefly explained.