The expansion sleeve connection and working principle cannot be omitted in the coupling

　　In the upright double-giving pumping unit, the coupling plays a key role in transmitting power, and the coupling between the shafts is the method of expansion sleeve coupling.The notch of the expansion sleeve is through-type, which has good structural expansion and deformation characteristics. The additional key connection and the seam screw connection ensure the effective transmission of the rotation load between the shafts. The taper sleeve used in the coupling is easy to disassemble. The taper can be designed to be slightly larger, with a ratio of 1:7.

　　The main purpose of this expansion sleeve connection is to transfer the load: due to the limited space available, the compression bolt is designed as a seam bolt between the taper sleeve and the half coupling. Through the pretension of the compression bolt, the taper sleeve is produced well. The axial positioning of the shaft, which in turn expands the half coupling and transmits power, not only ensures the coaxiality of the taper sleeve relative to the rotating shaft and the half coupling, but also strengthens the interference between them to achieve stable transmission The effect of the load.Advantages: good centering, high carrying capacity, convenient disassembly and assembly.

　　Disadvantages: The machining accuracy of the mating surface is relatively high.

　　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 increases, and the friction torque gradually increases. Large and drive the load to run. Under severe overload or locked-rotor conditions, the load end torque is greater than the friction torque, and the centripetal force received by the centrifugal friction block is reduced, resulting in a reduction in the force of the slider, and the coupling acts as an overload protection. When the equipment load increases or decreases suddenly, 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. , Just like a heavy hammer hitting the joint surface countless times, thereby damaging the joint surface and the key pin. 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 couplings should be based on the working performance of the equipment (power, speed, shock, vibration, load changes) , Drag system requirements), working environment (ambient temperature, environmental humidity) and many other factors, based on the principles of science, reason, application, and economy, select the coupling that is applicable to the site, so as to lay a good foundation for the equipment and operation. There will be no damage to the keyway and flat key of the output shaft sleeve. The equipment runs without noise, vibration, and impact. Various operating indicators are normal, and the equipment failure rate is significantly reduced. And the large torque value of the coupling is lower than that of the motor The subversive torque protects the motor from overload. If overload or even "stuck" occurs, it can unload by itself to protect the motor and transmission mechanism.