Zenith Lab (Jiangsu) Co.,Ltd , https://www.zenithlabo.com
Shanghai Langxian Electromechanical Equipment Co., Ltd., which is committed to becoming a national industrial development, is the largest manufacturer of cold welding equipment in China. It relies on the development and production capacity of strong cold welding equipment, and relies on its comprehensive system repair solutions and technologies. Experience, for many years, has been actively cooperating with the world's leading power equipment manufacturers and various supporting companies, and constantly develop new technology, which has become a powerful driving force for the development of the power equipment industry.
Shanghai Langxian's total solutions for power system repair include:
I. Generator Rotor Shaft Repair Whether the hydroelectric or thermoelectric, the generator rotor shaft is a key component. Due to various reasons such as manufacturing, installation or operation, coupled with the complicated working environment and important force components, accidents such as rotor journal strain, bruises and abrasions often occur. Damage defects of the journal, affecting the uniform performance of the oil film during operation, vibration performance of the unit; local damage, stress concentration, affecting the strength of the rotor, high contact stress generated at the surface and groove parts, etc. will form fine cracks, Depressions, scratches, and other unrecoverable wear and tear are inevitable; these will cause serious damage to the safety of the unit. To this end, it is not only a very meaningful work in the electric power operation and equipment manufacturing departments, but also a difficult problem that has long plagued the people. It is not only a very meaningful work in the electric power operation and equipment manufacturing departments, but also the key to solving this problem. The surface is reinforced, and the welding parts of the strained and damaged parts are precisely welded.
The traditional welding method of argon arc welding, electric welding, and second welding is too large, and can only be used in certain places. When performing the welding repair work, the rotor shaft is liable to cause deformation, hardness reduction, local annealing, cracking, pores, undercut, deformation, slag inclusion, discoloration, etc., and secondary defects are formed. Because the soldering speed of the placement machine is too slow, the bonding strength after welding is low, and it is easy to fall off; the finish is also low, the density is poor, the pinholes are often encountered after the welding, and the welding requirements for the rotor shaft are often required. Looking at the ocean and sighing. The speed of the cold welding machine that rotates the welding wire is also slow. The combination after welding is low, the hardness cannot meet the requirements of the rotor shaft, and the smoothness and compactness are relatively poor. Using laser welding, the rotor shaft of the giant can only be on the side of the laser welding table, even if it is a rocker type, because the welding wire is thin, the flexibility is poor, the rotor shaft cannot be welded, and the groove portion and the bearing center are strong. Not enough.
The welding compensation of the generator rotor shaft requires both the speed of the conventional welder and the effect of cold welding laser welding. In this respect, Shanghai's system restoration project has great advantages. The so-called system repair project is to combine the various functions of various welders better, to achieve strengths and avoid weaknesses, and to take advantage of the overall. The guiding ideology and repair methods of the whole repair process have undergone fundamental changes. First of all, we have changed the way of the past and the whole world. We use a variety of welding methods to make full use of the traditional welding machine in speed and flexibility. The advantages, but also the advantages of cold welding, to achieve the accuracy of laser welding.
Our repair of the rotor shaft at Lanzhou Xigu Thermal Power Plant is a classic case. The rotor shaft of Lanzhou Xigu Thermal Power Plant has many strains and multiple wears. According to the actual needs, application system repair project, we made the following program:
1. Dispatching three experienced and practical engineers to guide the repair.
2. Two HWS-1000 precision repairing machines and one ESD-05 type electric spark surfacing repairing machine were selected.
HWS-1000 precision repairing machine functions: laser welding (wire diameter 0.1-2.0mm) + argon arc welding (2A stable arc starting) + cold pressure welding; ESD-05 type electric spark surfacing repair machine can choose a variety of welding Material for surface coating reinforcement, welding of electric aluminum alloy non-ferrous metal parts and welding of special parts.
3. The system repair plan is formulated. The system repair project is to provide technical personnel support, formulate the system repair plan, and combine various functions of various welders to complete large-scale and complex repair projects. To put it simply, for some places where the requirements are not high and need to be repaired, we can perform rapid welding, and the edge parts and the corner parts can be directly welded by the precision welding function. For some parts with high precision requirements, we use the cold pressure welding to fix the welding wire under the Microscope, and then complete the precision welding function. A small amount of the excess surface of the shaft surface is surface-stacked with ESD-05 type equipment. Such a variety of devices take turns, cooperate with the operation, and a variety of functions can be switched at any time and simply. It not only solves the problem that laser welding and cold welding can not be repaired before, and the speed is greatly improved. It took only 30 hours to complete the work of several traditional equipments in the past for several weeks, saving the economy of tens of millions of yuan for the power plant. The loss also greatly reduced the loss of 1 million per rotor shaft per day.
Second, the repair of the gearbox generator equipment requires high gearbox: small size, light weight, high reliability, long life, easy maintenance. The failures of the gears in the gearbox are consistent with the observations or reports at home and abroad, that is, the most common damage is still the tooth surface, from the initial micro-candle to the gradually expanding large-area candle, peeling off or abrasion. Numerous studies and observations have shown that micro-candles mainly occur at low speeds, while others occur rarely. The reason is generally considered to be related to the working state of the wind turbine gearbox, such as speed and load change. In addition, the roughness of the tooth surface has a direct influence on the generation of the micro-candle. How to reduce the tooth surface roughness is a key problem. Shanghai Langxian Company has a systematic solution. Our company's practice in Leshan Power Plant is to weld a surface with a relatively high-quality material, and to increase the surface hardness while performing tooth surface finishing. This not only increases the finish, but also causes damage to it and prolongs the service life.
Third, the surface strengthening treatment of other workpieces due to the harsh natural environment of power generation equipment. High and low temperature, humidity, typhoon, sand, salt spray corrosion, external impact, waves, tides, etc., corrosion has almost become unavoidable damage. How to anti-corrosion equipment to resist harsh environments has become the focus of equipment suppliers. Shanghai Lang is committed to extending its life. Surface treatment is a necessary and indispensable step for long-lasting and effective corrosion protection. Shanghai Lang is now known for its flexible system repair and can be operated on site to avoid the size and displacement tolerance caused by movement. It can also be coated and strengthened on the surface of the mold, and can be precisely repaired after corrosion. Even the heat-treated workpieces such as chrome-plating and nitriding can be used in different ways according to different environments, so that the life of parts or molds is greatly improved. .
Shanghai Langxian Electromechanical Equipment Co., Ltd. Wang Zijun Engineer 021-51606200 15000331823
Application of System Repair Engineering in Power Equipment Repair
Background of power equipment system repair China's power industry has entered the stage of developing large power grids and large units. With the advancement of power generation technology and scale effect, the current wind power equipment is developing from KW level to MW level, and the application is gradually moving from land to ground. With the development of offshore areas and other harsh areas, there is a way in which thermal power dominates and becomes nuclear power, and wind power, hydropower and solar energy coexist. China's power equipment manufacturing level is still at a certain gap with the international leading level. China's power equipment and equipment is simply the Museum of the World. Since the withdrawal of a certain equipment in a large power grid will directly affect the stable operation of the system and the economic benefits of a large number of users, more and higher requirements are imposed on the repair of power equipment, and the requirements for the repair of the system of the power equipment are also Increasing. Repair requirements for power generation equipment: fast, high reliability, long life, corrosion resistance, and low cost become a technical challenge.