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The Late Performance Of The Service Life Of Directional Coupler
Nov 03, 2017

The late performance of the service life of Directional Coupler
Suddenly to the coupler failure. It is mainly the result of various unfavorable factors and external influences. It is characterized by suddenness and contingency. It is generally unpredictable with the time of the Directional Coupler.
Associated with progressive failure, the failure in development, operational indicators decline, but not yet lost function, but also close to the germination stage, when such a fault can be diagnosed, that is considered a potential failure phenomenon, commonly known as sick jobs. For example, the Directional Coupler vibration value increases gradually, the sealing system has oil marks, etc., belong to the potential failure. Function failure. Some parts of Directional Coupler failure, loss of function can not work called functional failure.
Before installation, the Directional Coupler should check whether the motor shaft, Directional Coupler input shaft and output shaft hole, shaft diameter of the working shaft (or reducer shaft), keyway, shaft extension and the total length of the Directional Coupler meet the requirements. Remove burrs everywhere to repair bruised surfaces. Directional Coupler shaft hole and the motor shaft, reducer shaft with the recommended clearance gap with the gap, the transition can also be used, but must not choose the interference fit.
Mainly by the deterioration of the product parameters of the process (wear, corrosion, fatigue, aging) gradually evolved, which is characterized by the probability of occurrence and the use of the time, most of the hydraulic Directional Coupler in the effective life of the product after the performance come out. For example, bearing wear, oil seal wear, seal aging and so on. As soon as a progressive failure marks the end of a product's life, it is a mark of product overhaul. As this failure is gradual, it can be predicted.
Limiting Directional Coupler main rotating parts are ZL104 cast aluminum parts, assembly and disassembly can not be beat, to avoid fragmentation, but the coupler output shaft and reducer high speed shaft connection, sometimes due to smaller size tolerance, long-term Rusty operation, making Directional Coupler removal is very difficult, in order to solve the problem of disassembly, the following methods can be used:
(1) use YOXE series of products, you can not move the motor, the reducer can hang out the coupler
(2) Using the removal screw in the spindle hole of the coupler, remove the coupler with the removal screw
(3) Using a uniform arrangement of screw holes on the left end face of the coupler spindle to jack the coupler with a jack, this method is more effective than point 2
Can be used cheap cage motor, limited torque Directional Coupler and cage motor match, but the motor no-load start, and to its peak torque to start the load to solve the problem of full load start difficult and reasonable design to reduce Motor seat, save energy Due to the limited torque type Directional Coupler in a moment of overload protection and working fluid overheating protection to prevent equipment accidents and burn-in Motor in multi-motor drive or multi-pole drive can be limited by the limit type Directional Coupler Filling volume adjustment Fire speed governor type Directional Coupler light path adjustment to make a motor power balance, and can delay the start sequence to reduce the starting current peak, reducing the transformer capacity. Can make motor start-up shorten the start-up time, thus reducing start-up energy consumption and reduce the impact on the grid to extend the start-up time and smooth start-up can isolate the torsional vibration and slow down the impact to extend the mechanical life Reliable operation, low maintenance costs, the transmission system Simple, high operational reliability.

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