The pins are often worn like this
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Everyone, I have a horizontal centrifugal water pump with an elastic sleeve pin coupling. However, the pin often wears eccentrically. Eventually, the elastic ring wears and the pin wears the backrest wheel hole on the motor side, and the coupling is scrapped! I replaced the coupling in the picture and used it for less than a month (the elastic ring + coupling were replaced together). Please help analyze the reasons.
Usually measure the vibration to see if the foot bolts are loose, check the alignment to see if there is any effect, and then check the bearings and rotor.
Usually measure the vibration to see if the foot bolts are loose, check the alignment to see if there is any effect, and then check the bearings and rotor.
Compared with the outer diameter of the coupling, the buffer rubber and core shaft are obviously designed to be smaller. It is better to confirm whether the current of the motor increases significantly during operation. Compare it with the new pump when it leaves the factory. If the current is the same, it means that the coupling alignment accuracy is too low or there is a design defect. The workmanship seems not to be that of a major manufacturer, so check to see if there are any vibrations or scratches inside the pump.
Vibration is measured consistently without problems
There is no change in the current. The vibration is measured every day and everything is normal.
Then check the motor torque and find the coupling manufacturer according to the torque to confirm the coupling structure and model. Anyone who recommends a coupling without asking about the torque is an amateur. Leave a margin for torque.
How about the coupling alignment? Change the material of the elastic washer.
1. What is the size of the hole and the outer diameter and inner diameter of the ring? Whether the holes are evenly distributed and whether the tapered holes have been reamed. 2. If there are no problems, replace the hoop with cowhide.
This post was last edited by CHANGBAISHI on 2020-8-9 16:18. It is suggested to measure the hole spacing of the coupling to see if it is evenly spaced. After installing the coupling, manually rotate it forward and backward. If there is a trace amount of clearance, it is normal. Otherwise, this phenomenon will occur due to uneven force. Oh well, frequent starts or overloaded frequent starts are also factors that need to be considered. Oh, and for reference, it is best to purchase couplings from well-known companies.