Description of the coupling
发布时间：2019-06-12
The selection of couplings depends primarily on the material; generally, there are three categories: hard aluminum alloy, engineering plastics, and steel.
The selection of couplings primarily depends on the material; generally, there are three types: hard aluminum alloy, engineering plastics, and steel. The selection of couplings primarily depends on the material; generally, there are three types: hard aluminum alloy, engineering plastics, and steel. Secondly, consider the size of the shaft diameters at both ends of the coupling, as well as the coupling's outer diameter and length.
Most importantly, select a coupling with a rated torque that matches the actual operating torque of the motor or lead screw.
If the selected coupling has insufficient torque and exceeds its rated range, it is easily prone to breakage. Gear coupling failure analysis:
Hoisting accessory coupling failures:
① Severe tooth surface wear.
② Significant axial displacement of the inner gear ring, even to the point of disengagement.
③ Broken teeth. ④ Broken coupling connecting bolts.
The main causes of the above failures are as follows:
First, insufficient or lack of lubricant in the hoisting accessory coupling. Or improper use of grease, causing grease calcification, resulting in poor or no lubrication between tooth surfaces, leading to severe tooth surface wear. This can be avoided by replacing the lubricant with new grease, regularly injecting qualified lubricating grease, preventing oil leakage, and ensuring sufficient oil volume.
Second, excessive error in the horizontality and coaxiality of the two shafts, exceeding the coupling's compensation range, resulting in incorrect meshing of the shaft teeth and inner teeth, causing local contact and additional torque. This additional torque can be decomposed into axial force, acting on the inner gear ring. The magnitude of this force depends on the magnitude of the deviation, being directly proportional to the deviation; the larger the deviation, the greater the force, leading to axial displacement of the inner gear ring of the hoisting accessory coupling. If the displacement is too large, it will be uncontrollable, resulting in severe gear wear, even broken teeth, and disengagement of the inner and outer teeth, until transmission is impossible.
This type of failure is difficult to handle and requires production downtime. That is, realignment is needed, either realigning the reducer side or the drum side.
First, identify the location with the larger offset error. This requires measuring the direction of coupling offset, i.e., measuring the horizontality and coaxiality of the main shaft and the horizontality and coaxiality of the reducer main shaft, and then realigning according to quality standards to eliminate the fault.
In addition, large errors in the horizontality and concentricity of the two shafts cause stiffness during coupling rotation. This is similar to the reasons for gear wear in hoisting accessory couplings mentioned above. The connecting bolts are subjected to additional bending moments in addition to normal forces, causing them to break. This is the main reason. This often occurs when there is a large height difference in the horizontality of the reducer main shaft.
Furthermore, thinner bolt diameters, insufficient strength, or poor bolt material can also cause bolt breakage.
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