The direction of development of the domestic crane

 (1) Improved lifting structure to 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 bridge crane  used in semi-generic off-track main beam structure, compared with the track box girder can be reduced or eliminated in the small girder stiffened plate, canceled short stiffened plate, reducing structural weight, saving processing time. Currently the national Spark Program proposed bridge using four split structure is not high, making it the same with the ordinary 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 high strength bolts connecting; 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 reduction, to reduce the capital cost plant, plant life increases.

    (2) to large-scale development

    Since the state tournament source two qe two wide attention and funding the construction of many large and medium hydropower turbines is growing. Especially in the construction of the Three Gorges project requirements for large  overhead gantry crane   rising rapidly. Three Gorges Project main plant installed two 1200/125t bridge crane, equipped with a large tower crane 2000t. Currently in the construction of large and medium-sized hydropower stations, there are many, such as Yantan, Longtan, GEHEYAN, Fujian outlet power stations; There are many nuclear power plants and large and medium-sized power plants need to build, it can be expected, large tonnage High Performance cranes requirement is very large and broad prospects.

    (3) to fully absorb foreign advanced technology

    Crane size car run institutions of the German demag company's "triple play" drives, hanging on the end of the beam inside, it is not under the main beam deflection and vibration, improved operational performance and life institutions, and to structure Compact, beautiful appearance, easy installation and maintenance. With the domestic machining capabilities, so that carts end beam and small frame overall boring as possible, and thus split and wheels 45 degrees or cylindrical bearing housing will likely replace the angular bearing box, mounted on axle hole on the axle centerline and end beam centerline constitute the standard 90 degrees, so the horizontal and vertical deflection of the wheels can be strictly controlled within prescribed limits, to avoid the phenomenon of eating track. Due to the small frame is a bore formed after welding, hole center line of the four wheels in the same plane, the three-point landing successfully solved the problem.

Hoisting mechanism in the hardened or hardened reducer, gear accuracy of 7, the tooth surface hardness 320HBS, thus increasing the carrying capacity, extended service life. Electrical control absorbing foreign advanced technology, using a novel energy-saving speed control system. If thyristor cascade open or closed loop systems, scaling up to 1:30. With the increasing demand for speed, frequency control system will also allow for the  steel crane.  Meanwhile, computer-controlled crane will also be applied, such as the Three Gorges dam project 600t gantry cranes require frequency control system, microcomputer automatic correction and Big Head precision microcomputer monitoring system. With the development of production requirements for remote crane is also growing, Baoshan steel mill cranes in the study abroad after the proposed remote crane develop recommendations to improve safety, reduce labor.