In a narrow sense, the lifting system consists of main engine, electric control part, motor (matched by motor factory) and brake control part, and the development of lifting equipment is uneven.
(1) Main engine part The product structure, technical level, safety and reliability of main engine parts (spindle, drum, pulley, etc.) in China at present. ) has reached the international advanced level, but there is still a gap in product appearance and structural details need to be optimized. Compared with foreign similar products, the configuration is too conservative and the quality is too high.
(2) The gap between electronic control system and foreign technology is getting bigger and bigger (high-power AC -DC- AC system), which affects the overall competitiveness of domestic products. Key technologies can't get rid of their dependence on imported technologies, and their market share is decreasing.
(3) The power, overall size and quality of a single motor are quite different from those of foreign countries, and the material application is conservative, so there is a gap between the heating problem and the cooling technology.
(4) The principle, structure, configuration, reliability and performance of the gate control part of the gate control system are comparable to those of the international advanced ABB and SIMAG, but it started late, so it is necessary to strengthen publicity and improve market recognition.
Due to the gap of key technologies, especially the electric control part, it is difficult to realize the integration of electromechanical hydraulic system for hoist products, which restricts the improvement of product output value. At present, the difficulties faced by domestic large-scale lifting equipment are: lack of high-power electronic control technology, and have to rely on imports; At present, the maximum single machine power of domestic motors is 6 300 kW (not yet put into operation), so it is not competitive enough in high-power projects. The recognition of intelligent access control users is not high; Price advantage of mechanical parts of main engine (spindle, drum and pulley, etc.). ) Not very attractive. For the procurement of large lifting equipment, users tend to import equipment, and even specify imported equipment when bidding for the project. Recently, in the competition of large-scale lifting equipment, ABB and SIMAG have a high winning rate, which also has a great influence on the follow-up projects of other companies.
At present, the main engine system, motor, brake control system and electric control part of lifting equipment are often separated, supplied by different manufacturers, or even invited for bidding separately, and rarely complete sets of electromechanical products are formed. Design institutes and owners also highly admire this supply model. For example, the research and development of large lifting equipment is produced by domestic manufacturers, the brake control system is designated as imported ABB or SIMAG products, and the electrical part is supplied by another domestic electrical manufacturer, which brings a lot of inconvenience to project implementation and equipment maintenance.
From the macro product packaging, lifting equipment can be extended to the whole lifting system. It consists of lifting equipment, lifting container and suspension device, derrick, automobile loading and unloading equipment, steel wire rope and auxiliary equipment. (rope adjusting equipment, rope changing equipment, etc.). ). At present, foreign companies such as Swedish A BB, Simag, etc. can supply products in the form of engineering projects, and complete the calculation of equipment selection and the supply of complete sets of equipment and auxiliary machines. At present, the domestic model is that the design institute is responsible for the selection and calculation, and the equipment manufacturer is responsible for the design and manufacture of the equipment. Compared with foreign companies, the technology is not comprehensive and the types of equipment are incomplete. Domestic lifting equipment, lifting containers and suspension devices are all made by professional manufacturers (Xuzhou, Taian, etc.). ); Derricks are generally provided by design institutes and manufactured by installation units or coal mills. Automobile loading and unloading equipment is manufactured by small and medium-sized coal machine factories; Wire ropes are manufactured or imported by professional manufacturers (Guizhou, Anshan and Shizuishan); Auxiliary equipment (rope adjusting equipment and rope changing equipment, etc.). ), such as rope adjusting and rope changing equipment for small hoists, is relatively mature in technology and made by small and medium-sized coal mills. The development of rope adjusting and rope changing equipment for large hoist is relatively backward, and only a few manufacturers have developed products at present. Because the products belong to different manufacturers, there is no unified consortium, and a promotion project is supplied by multiple equipment manufacturers, which is far from imported brands.