The complexity of the construction of nuclear power will affect the development of large-scale engineering machinery

In the comprehensive nuclear safety checks and routine ongoing safety evaluation, based on the National Nuclear Security Administration in February 2012 drafted the "nuclear safety and radioactive pollution prevention" Twelfth Five Year Plan "and the 2020 vision" (hereinafter referred to as "Nuclear security plan") and the whole of society for public comment,hoist gantry crane the State Council examined and approved in the same year in May and issued a "nuclear safety planning." The plan put forward China's 2020 nuclear safety vision: the operation and safety of nuclear installations under construction levels continue to increase, "13 5" (2016-2020) and after the new nuclear units and strive to achieve virtual elimination from the design of radioactive substances the possibility of release; fully completed state supervision of nuclear and radiation safety technology research and development base and the national radiation environment monitoring system; formation of fully functional, responsive, hoist crane and efficient operation of nuclear and radiation accident emergency response system. 2020, to maintain the international advanced level nuclear safety, nuclear safety and to enhance the level of radioactive pollution prevention, radiation, environmental quality remains good.

After the Fukushima nuclear accident, the Chinese government will suspend inland nuclear power plant construction plans. Worldwide, some countries have taken measures to abandon its nuclear program, so that today in the energy sector is affected. For example, in Germany closed after the Fukushima nuclear power plant, the use of wind power generation, but recently affected by no wind, you can not generate electricity; Japan after the accident at the Fukushima nuclear power plant, shutting down part of the nuclear power plants, directly affect their summer supply, while resulting in reduced capacity of local enterprises or to the relocation of production, seriously affecting national economic development. In the construction of new projects for large crawler  jib crane   and other product performance and technical indicators will be increased accordingly.

Large crawler crane lifting nuclear power plant dome

Japan's Fukushima nuclear accident in a certain range stirred public confidence in the safety of nuclear power, led to the development of nuclear energy world profound reflection, more than two years,overhead gantry crane countries more objective understanding of nuclear energy development has become more rational, nuclear energy as a clean, safe, large-scale alternative forms of energy can still meet energy needs in many countries, energy security, climate change, alleviate pressure on resources and the environment an important choice. Japan's Fukushima nuclear accident, the Chinese government actively respond on the basis of a comprehensive assessment and reiterated unswervingly adhere to the development of nuclear energy policy,bridge gantry crane the current construction of nuclear power has steadily returned to normal. China currently has 17 nuclear reactors in commercial operation, with a total installed capacity of 14.7 million kilowatts, nuclear power plant under construction 29 units with a total installed capacity of 30.57 million kilowatts, China has become the focus of one of the world's nuclear power development. With China's implementation of the policy of energy saving and long-term nuclear power development plan and the implementation of nuclear power in China's energy structure will occupy more market share. Construction machinery industry as the direct beneficiaries will be in stock and opportunities for further development,eot crane in particular the application of large-scale machinery products will be greatly boosted.

Erecting machine operating procedures and precautions ( on )

First, when erecting machine moves longitudinally to do all the preparatory work , for once in place, not half-way stop .
Second, the bridge machine running vertically on both sides of the track corresponding to the level specified height and remain stable.hoist gantry crane Before , during and after each lateral outrigger orbit required level , and strictly control the spacing, three tracks must be parallel .
Third, in the oblique concrete beam bridge installation, bridge machine before , during and after walking round outrigger positions , left and right front and rear wheels to stagger , and its pitch angle can be calculated based on bias , so that may be in the same lateral outrigger wheels orbit - specific matters can contact with manufacturing units .
Fourth, the bridge machine crane carrying concrete beams longitudinally running, hand pull the front leg parts required gourd (5t) and sliding rails fixed to enhance the stability of tension .
Fifth , when installed on the bridge when going downhill ,overhead gantry crane erecting machine longitudinal displacement measures should prevent sliding . For example : the use of triangular iron for protection in the front and rear wheels , especially in the legs away from the beam end close, the shift to the attention of the control .
Sixth, erecting machine installation , you should always pay attention to safety checks, each mounting a hole must conduct a comprehensive safety inspection , identify problems and timely treatment to stop work in order to continue operations. Work with mechanical and electrical failures allowed .
Seventh, in addition , the installation does not allow overload operation, not oblique hanging enhance operations.
Eighth, the connection pin of the processing material requirements must be in accordance with the design drawings shall not be replaced with a low steel processing .
Ninth, erecting machine must be carried out after assembly retry crane lifting operation , can also be hanging concrete beam specimens after erecting machine and then run the place to begin the installation .
Tenth, in five more than the wind conditions, the non- job, you must use a solid bridge machine rigging and lifting crane ,  bridge gantry crane  to stop working when you turn off the power , to prevent accidents.
Eleventh , erecting machine in place must be strictly controlled longitudinal position sizes to ensure a smooth installation of precast concrete beams in place .
XII , as the case of the bridge erecting machine installation of large equipment, erecting machine operations must be clear division of labor, unity of command, to set up full operations staff, full-time and full-time electrician safety inspectors .overhead bridge crane Also, there are strict construction organization and measures to ensure construction safety.

Development of domestic crane

  The rapid development of modern science and technology to promote the modern design and manufacturing capabilities, the fierce market competition is increasingly reflected in technology competition , which prompted the overhead gantry crane  machinery products technical performance into a new phase , lifting machinery is experiencing a huge technological change. Some industry leading enterprises in the introduction , digestion and absorption of advanced industrial countries on the basis of similar products , keeping up with international trends, the introduction of new theories, new technologies, new methods to promote optimal design , CAD / CAE and other modern design methods, products are also to the automatic , intelligent and information sent tuxedo, to complete , systematic and large-scale development ,bridge gantry crane to large , efficient and energy-saving technology development , product diversification, the development of special cranes to meet the requirements, design to scale, general development, and starting to focus on product interpersonal rationality, shape, surface coating such as the appearance of quality , help to improve operational efficiency and safe operation.
      An improved lifting dissipation , reduce weight
       Cranes and more domestic computer optimized design has been adopted , in order to improve the machine's technical performance and reduce weight , and in this context as far as possible the new structure . If 5 ~ 50t overhead  eot crane  sed in semi- generic off-track main beam structure, compared with the track box girder can be reduced or eliminated in the small girder stiffened panels , plus canceled short plate board, reduce structural weight , saving processing . National Spark Program had split with four proposed bridge is not high structure , together with the ordinary racetrack in the same bridge crane lifting height , the plant can be reduced corbel elevation 1.5m: two ends of the main beam is placed end of the beam, with the bolt connection: wheel tread height drop as a result , will make the plant corbels elevation drop. In the role of the vertical wheel load , the calculation of the column height, factories and infrastructure cost reduction , plant life increases.
      2 , the full absorption of foreign advanced technology .
         Are:
        ( A ) the size of the crane car run institutions a "triple play " drives, hanging on the end of the beam inside it from the main beam deflection and vibration under the influence of improved operational performance and life institutions , and to compact, beautiful appearance , easy installation and maintenance .
        ( 2 ) With halogen machining capabilities within the overall frame carts and small bore possible. Thus 45 ° mesh and wheels or cylindrical bearing box will replace the angular bearing housing , the shaft mounted on the wheel axle beam centerline axis of the hole and the end of votes constituting 90 °, so the horizontal and vertical deflection of the wheels Phan can be strictly controlled within the specified country , the occurrence of the phenomenon of eating track . The frame is a small bore formed after welding , hole center line of the four wheels in the same plane , three landing successfully solved the problem .
        ( 3 ) Lifting mechanism used in the hardened or hardened reducer , gear accuracy of 7 , the tooth surface hardness 320HBS, thus increasing the carrying capacity , extended service life.
        ( 4 ) electrical control, digestion and absorption of foreign advanced technology, using a novel energy-saving speed control system . If thyristor cascade open or closed loop systems, speed ratio up to 1:30. With the increasing demand for speed , frequency modulation with Dingmen cranes require frequency control system, microcomputer automatic correction country has a large head and precision microcomputer monitoring system.
        ( 5 ) Remote crane development needs to be as production volume is also growing , Baoshan steel mill cranes in the study abroad after the proposed remote crane develop recommendations to improve safety, reduce labor .
     3 , to large-scale development
         Since the state 's emphasis on energy and funding the construction of many large and medium hydropower turbines is growing. Special Chang Three Gorges Project construction on a large crane requirements rapidly. Three Gorges Project main plant installed two 1200/125t  hoist gantry crane, equipped with a 2000t in type tower crane . With the current national policy of stimulating domestic demand, the gradual introduction , there are many large-scale hydropower , nuclear power plants and large and medium-sized power plants need to build , can be expected in high -tonnage cranes requirement is very large and broad prospects.

What is a crane

    A crane is a  hoist crane  is a for loop, intermittent movement of machinery. A work cycle include: extract extract means to put items from the lift, and then move to the designated place lower level items, followed by a reverse movement, so extract unit returns to original position for the next cycle.
       Crane hoisting mechanism mainly run agencies, luffing, slewing mechanism and metal structures:

       Crane hoisting mechanism is the basic work of institutions, mostly by hanging system and winch components, there are also lifting heavy objects through the hydraulic system.

       Operating agencies to transport heavy loads or adjust the level of vertical  overhead bridge crane  working position, usually by the motor, speed reducer, brake and wheel components.

       Luffing jib crane in only with, the amplitude decreases when the jib looked up, bent over when the amplitude increases, the amplitude of balanced and unbalanced luffing two kinds.

       Rotating mechanism for rotating the boom is driven by the device and the rotary bearing device component.

        Steel crane  metal structure is the skeleton, the main carrier such as bridge, boom and mast for box-shaped structure or truss structure, but also for the web structure, and some can be used as a steel support beam.

Crane Safety Precautions trolley line

  Crane safety trolley line is a new mobile power supply unit, with its insulation, security, temperature, vibration, energy saving and other advantages to gradually replace the old bare angle iron and copper trolley line.
       bridge gantry crane  in use and easy off, sometimes in the transmission conduit sparks some serious blasting trolley line ", resulting collector replaced too frequently, affecting production. Therefore conducted the following improvements:
       (A) increasing the collector brushes chamfered and polished smooth;
       (2) increasing the collector between two opposite brush spring strength, flexibility, ensure spring return freely;
       (3) to deepen. Reinforcement collector in a spring seat,hoist gantry crane the return spring to ensure the brush is not easy in the work "bit string";
       (4) two safety trolley line connections connecting block should be chamfered to ensure a smooth transition collector. Meanwhile, to ensure the safety of the normal use of the trolley line, driving workers standardize operations, maintenance workers of periodic maintenance,bridge crane periodic inspection is also essential.

Overhead crane safety inspection

In order to ensure the safe operation of  overhead gantry crane  , the crane operation required during some routine security check items and points are as follows:
 
 1, lifting height limiter, travel limit switch and the interlock mechanism normal performance, safety and reliability.

 2, the main components meet the safety requirements: opening increases less than 15% of the original size, torsional deformation of less than 10%; plate hook bushing wear less than 50% of the original size, plate hook spindle wear less than 5%, no peeling, burrs, welding. Hanger hook and pulley no obvious defects. The surface of the wire rope wear, corrosion is less than 40% of the diameter of the wire, broken wire in a twisting pitch of less than 10% of the total number of wires, no breakage, no thinning,eot crane no core prolapse, dead twisting, extrusion , annealing, burning phenomenon. Rope end connections and fixed clamp, plate, wedge block connection intact, no loose, plate no less than two, no less than three clips. Roll no cracks, connections, fixed no loose; cylinder wall wear less than 20% of the original thickness; secure volume of not less than two laps, drum and rope diameter ratio meets the requirements. Balance wheel fixed intact, wire rope shall conform to the requirements. Brakes no cracks, no loose, no serious wear, brake clearance is equal on both sides of the right size, there is sufficient braking force, brake band wear less than 50% of the original thickness.
 
      Through the  bridge gantry crane  safety routine inspection, to prevent accidents, reduce equipment accidents, improve equipment operation rate, lower maintenance costs etc. played a significant role.