Coupling working principle and installation knowledge

　　Improper selection of coupling will affect the operation of electromechanical equipment, and even cause equipment failure.The selection of the coupling should be based on the working performance of the equipment, working environment and many other factors, choose the coupling that is suitable for the site.The coupling will not suffer damage to the keyway and flat key of the output shaft sleeve, and the equipment runs without vibration, noise and impact, all operating indicators are normal, and the equipment failure rate is significantly reduced.In addition, the large torque value of the coupling is lower than the overturning torque of the motor, which protects the motor from overload. If overload or even jam occurs, it can unload by itself to protect the motor and transmission mechanism.

　　The working principle of the coupling: the rotation of the prime mover drives the swing arm to rotate, and it is thrown out under the action of centrifugal force. As the motor speed increases, the positive pressure of the three centrifugal friction blocks installed on the swing arm on the friction wheel is also Increase, the friction torque gradually increases and drives the load to run.Under severe overload or locked-rotor conditions, the torque at the load end is greater than the friction torque, and the centripetal force received by the centrifugal friction block decreases, resulting in a decrease in the force of the slider, and the coupling plays a role in overload protection.When the equipment load suddenly increases or decreases, the friction block and the friction wheel produce intermittent relative movement, thereby forming an alternating impact load, which repeatedly impacts the coupling surface of the coupling output sleeve and the input shaft of the reducer , Like a heavy hammer hitting the joint surface countless times, thereby damaging the joint surface and the key pin.In order to effectively improve the operating conditions of the equipment, there is a change in the connection device of the electromechanical equipment.

　　Coupling is an important component of electromechanical equipment, improper selection will affect the operating conditions of the equipment, and even cause equipment failure.The selection of the coupling should be based on the working performance of the equipment (power, speed, impact, vibration, load change, drag system requirements), working environment (ambient temperature, environmental humidity) and many other factors, based on science, reason, and application. Based on the economic principle, choose the coupling that is applicable to the site, so as to lay a good foundation for the equipment and operation.The coupling will not have damage to the keyway and flat key of the output shaft sleeve. The equipment runs without noise, vibration, and impact, all operating indicators are normal, and the equipment failure rate is significantly reduced.In addition, the large torque value of the coupling is lower than the overturning torque of the motor to protect the motor from overload. If overload or even "stuck" occurs, it can unload by itself to protect the motor and transmission mechanism.

　　(1) Before installation, check whether the two shafts of the prime mover and the working machine are concentric, whether there are wrapping paper and scratches on the surfaces of the two shafts, whether there are debris in the inner holes of the two half couplings of the coupling, and the edges of the inner holes Whether there are bruises, clean up the shaft and half coupling if so, and treat the bruises with a fine file.Then check whether the inner hole diameter and length of the two half couplings are consistent with the diameter and shaft elongation of the prime mover and working machine.In general selection, it is better to make the length of the prime mover and the working machine end half-coupling less than its shaft elongation 10～30mm.

　　(2) In order to facilitate the installation, it is good to put the two half couplings in a 120-150 incubator or oil tank for preheating, so that the inner hole size increases and it is easy to install.After installation, ensure that the shaft head cannot protrude from the end face of the half coupling, and it is better to be flush.Detect the distance between the two halves of the coupling: take the average of the readings of 3 to 4 points measured along the two inner sides of the flange of the half coupling, and the sum of the measured dimensions of the extension and the two diaphragm sets, both The error is controlled within the range of 0～0.4mm.

　　（3）找正：用百分表检测两半联轴节法兰盘端面和外圆跳动，当法兰盘外圆小于250mm时跳动值应不大于0.05mm；当法兰盘外圆大于250mm时，跳动值应不大于0.08。