Universal coupling selection and coupling fixing method

　　1. What is the speed of the cross shaft universal coupling shaft itself?Whether it needs to be dynamically balanced.Dynamic balance or balance is required, and which level of balance quality level is required.
　　2. Whether there are restrictions on the installation location.What is the specific installation length and whether it needs to be telescopic.When it is required to expand and contract, what is the outward extension of the universal joint in the short state.For universal joints that do not require expansion and contraction, considering the compensation of axial dimensional errors, the position for compensation in the system should be determined.
　　3. Whether there is a transmission device between the prime mover and the universal coupling.If there is a transmission ratio, it will be output by several shafts after passing through the intermediate transmission device, and the elastic sleeve pin coupling is whether there is power shunt.Consider the type, power and speed of the prime mover.
　　4. It is necessary to consider the type of prime mover and the load category of the optional cross-shaft universal coupling to transmit load: one-way constant load, pulsating load or two-way alternating load.What is the installation status of the universal coupling?Horizontal, vertical or inclined installation.It is necessary to make the axis bend angle less than 3 degrees as much as possible. If the installation is oblique, determine the horizontal and vertical angle.
　　5. Considering the working environment of the prime mover, whether it is affected by harsh environmental conditions such as high temperature, dust, water spray, chemical corrosion, etc., choose the corresponding type of universal coupling according to the different use environment.
　　6. It is necessary to know the connection form and specific installation dimensions required at both ends of the universal coupling, as well as whether there are special requirements such as mounting brackets.
　　How to fix the coupling:
　　1. Fixed with positioning screws:
　　The two positioning screws have a 90° gap to lock the fixed shaft. In the traditional fixing method, since the front end of the screw contacts the shaft, it may cause damage to the shaft or difficulty in disassembly.
　　2. Clamping screw fixation:
　　Utilize the tightening force of the hexagon socket bolt to shrink the slit and clamp the shaft tightly.This method is convenient to fix and disassemble, and will not cause damage to the shaft, and is a very common fixing method.
　　3. Keyway type fixed:
　　It is suitable for high torque transmission. In order to prevent axial sliding, it is usually used together with set screw fixation and clamping screw fixation.
　　4. D-shaped hole is fixed:
　　Normally, if the shaft of the motor is D-shaped, if the set screw cannot be fixed, the hole of the coupling can be processed into a D-shaped hole corresponding to the size of the motor shaft, and fixed with the set screw, so there is no need to worry about slipping NS.
　　5. The expansion sleeve is fixed:
　　By tightening the four positioning screws on the end of the coupling, the tent cover is compressed and fixed, which is suitable for the connection and fixing of some stepping motors and servo motors with large torque, such as expansion sleeve diaphragm couplings and expansion sleeve plum couplings , Expanding sleeve bellows coupling, etc.