The introduction of the plum blossom coupling and the stiffness of the coupling

Plum blossom coupling is a kind of coupling. It is widely used at present, but many people do not know the related knowledge of plum blossom coupling very well. Here is a brief introduction, I hope it will be helpful to you:

XNUMX. Feature of plum coupling:

The plum blossom coupling is processed by machining methods such as turning, milling, and broaching, and then undergoes overall heat treatment.In order to determine sufficient mechanical strength, there is another type of claw plate on the market that is a casting, which can be mass-produced without processing loss.

At the same time, because the elastic body of the plum coupling is generally composed of engineering plastic or rubber, the life of the coupling is also the life of the elastic, so the service life of the plum coupling is still very long.The drum-shaped gear coupling has high buffering and vibration reduction performance, and has a large range of axial, angular, and radial displacement deviation compensation capabilities. Due to the cooperation of engineering plastics and metal parts, it has good self-lubricating performance , It is an ideal approximate universal elastic coupling.The elastic pin coupling uses several pins made of non-metallic elastic materials, which are placed in the flange holes of the two halves of the coupling, and the two halves of the coupling are connected by the pins. The coupling has a simple structure and is easy to manufacture , It is more convenient to assemble, disassemble and replace the elastic element without moving the two couplings.

There are many factors that need to be considered in the selection of plum coupling, such as stability, price, etc. Refer to the characteristics of various types of couplings, etc., so are there other points to note?

1. The working speed of the plum blossom coupling and the centrifugal force caused by it.For high-speed drive shafts, balanced couplings, such as diaphragm couplings, should be used, rather than eccentric slider couplings.

2. The size and nature of the torque to be transmitted and the requirements for the function of damping vibration.

3. Due to reasons such as manufacturing, installation, load deformation and temperature changes, it is difficult to maintain strict and accurate alignment of the two shafts after installation and adjustment.Existence of the degree of directional displacement and skew angle.When the radial displacement is large, you can choose a slider coupling, and when the angular displacement is large or the connection of two intersecting shafts, you can choose a universal coupling.When the two shafts produce a large additional relative displacement during the working process, a flexible coupling should be used.

XNUMX. Application range of plum coupling:

Plum couplings are used in CNC machine tools, CNC lathes, machining centers, 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 universal applications.

The stiffness of the coupling includes radial stiffness, axial stiffness and torsional stiffness.In actual engineering, the load changes are often caused by torsional vibration caused by torque fluctuations, so the main stiffness of the coupling is the torsional stiffness.In general, in shafting transmission, the stiffness of other parts of the system will be much larger than that of the elastic coupling. Therefore, in the simplified case, assuming that the elasticity of other parts is zero, only the coupling is considered.的flexibility.The torsional stiffness of the coupling is used as the torsional stiffness of the drive shaft system.

Although elastic couplings generally have buffering and vibration absorbing functions, elastic couplings with a certain value of stiffness do not have the effect of damping vibration under the action of any variable torque, and sometimes they may cause increased vibration.Therefore, only when the stiffness of the coupling is coordinated with other parameters and loads of the entire drive shaft system can the effect of vibration reduction be produced.For a certain drive shaft system, the moment of inertia and natural frequency can be, if you know the changing law of the transmitted torque, such as the amplitude and frequency, you can establish the differential equation of the shaft system in the torsional vibration, and solve the equation. The required stiffness of the coupling can be obtained.In order to facilitate the solution of the differential equations of motion, it is necessary to simplify the mechanical models of the moment of inertia and stiffness on the driving and driven sides of the coupling in the transmission shaft system.Usually it is more typical to simplify into two equivalent discs, which are arranged on both sides of the coupling.During the work of the coupling, the cyclic load is a typical load form in mechanical transmission.In order to avoid resonance, the changing frequency of the periodic load and the natural frequency of the drive shaft should be staggered.The method is to change the change frequency of the periodic load or change the change frequency of the shaft system.Because the load change frequency is related to the spindle speed, and the speed is a mechanical performance parameter, generally it cannot be changed at will.Therefore, the purpose of not resonating is generally achieved by changing the natural frequency of the shafting system, and changing the natural frequency of the shafting system generally changes the moment of inertia or stiffness of the shafting system. The moment of inertia is related to the mechanical structure, and it is difficult to achieve by changing the moment of inertia. , And the stiffness of the shaft system is easy to change.Therefore, changing the star-shaped elastic coupling is to change the stiffness of the shaft system to achieve the purpose of avoiding resonance.