The solution to the loose cable of the cable drum and the performance requirements of the coupling for the wind turbine

　　One, the solution to the loose cable of the cable drum

　　For rail-mounted gantry cranes, plum-shaped elastic couplings have common cable drum failures as follows: cable drum loose cable failure, drum mechanical failure, drum electrical circuit failure, and so on.After investigating the cable reel, it is found that the same type of reel has mechanical and electrical faults. The mechanical and electrical faults are mainly caused by defects in the reel design. If you want to fundamentally solve such problems, Technical transformation of the reel; and the reason for the loose cable of the reel is relatively complicated, which can be summarized as the following aspects: First, due to the insufficient torque of the hysteresis coupling, and the induction during long-term use The gap between the reels is increased, which causes the power to increase and the cable storage force is not enough, which causes the cable to take-up speed slowly; secondly, the friction strip of the reel is damaged, causing slippage between the cable and the reel, resulting in the lifting force of the cable insufficient.In order for the cable reel to work normally, the following measures can be taken to solve the problem.

　　The following measures can be taken to solve the problem of loose cable in the cable tube:

　　(1) Adjust the gap of the hysteresis coupling, and change the friction strip of the cable reel. Materials with higher friction coefficient can be selected, which will help to enhance the friction force, which can solve the problem of winding The problem of loose cables.

　　(2) A heater can be installed at the position of the reduction box of the cable reel, and the temperature of the gear oil in the gear box is always kept within a more reasonable range through the heater to improve the performance of the gear oil. It can prevent the occurrence of loose cable than the reel.

　　(3) In order to fundamentally solve the problem of cable reel loosening, the working conditions of the equipment can be optimized and adjusted, and a temperature sensor can be added as a control device, so that the entire system can automatically switch and rewind as the weather changes. The procedure of laying out the cables and then adjusting the torque will not only prevent equipment failures caused by improper adjustments or delays in time, but also reduce the labor intensity of the operators.

　　(4) During the manufacturing process of the equipment, strict control should be carried out on the arrangement of the cable reel and the machine process. The equipment has good performance when it leaves the factory, so that the problem of loose cable on the reel can be solved.

　　The hoisting machinery that adopts frequency conversion speed control can still use the traditional speed control method, such as the speed control of driving, still use the traditional cam controller, different gears give rise or fall direction instructions and multi-level speed instructions. Input to the control end of the inverter to realize direction control and speed regulation.The measure for the vibration of the variable frequency speed regulation system is to change the rigid coupling of the transmission system to an elastic coupling.

　　XNUMX. Performance requirements for couplings of wind turbines

　　　(XNUMX) Working environment

　　The environment of wind turbines in actual work is relatively harsh. According to the distribution of wind energy resources in my country, the areas where wind energy is already available and the areas where wind energy is about to be are located in coastal areas. XNUMX. However, salt fog often appears in coastal areas and the surrounding environment Both are relatively humid. XNUMX. Under this condition, the related parts of the fan are prone to rust and aging. XNUMX. In some mountainous areas, it is easy to produce strong airflow due to unstable settlement and rising airflow. (XNUMX) Load category

　　The load category is different according to the working load impact, vibration, braking and other reasons of the unit.Because different couplings have different load bearing capabilities, the load of the drum gear coupling on the wind turbine generator is mainly affected by the impeller, gearbox and generator.If the coupling is affected by its own center of mass and inertia, the unbalanced state of centrifugal inertia will also occur during operation.These factors not only affect the normal operation of the coupling, but also affect the selection index of the coupling.

　　(XNUMX) Transmission accuracy

　　The coupling of the wind generator is mainly to transmit power, but the transmission accuracy must be relatively high.During this period, not only must avoid non-metal elastic elements, but also avoid gaps between movable elements.Under this condition, the high-speed rotation process is prevented, and the coupling is prevented from being damaged.

　　(XNUMX) Relative displacement of the connected two shafts

　The two shafts of the coupling are affected by related factors such as manufacturing errors, installation errors, and deformation, and will cause displacement, especially the form of movement between components.The generator in the wind may exist for a long time during the paired operation, which is likely to cause the elastic support to continue to fail, thereby causing vibration under wind speed conditions.The manifestation of this phenomenon is different from the influence of generators and gearboxes. The displacement phenomenon produced on the axis cannot be controlled. To a certain extent, the displacement between the two shafts cannot be avoided. Under different operating conditions, the shaft Related factors such as the displacement of the train will also be different.

According to the above research and discussion of related phenomena, wind turbines are easy to change their working characteristics under the operating environment, so some conditions must be considered during the selection of the coupling.For example, the selection of transmission accuracy is relatively high.Not only should it be selected within a reasonable temperature range, but also the one with the ability and oil resistance to prevent slipping.