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.