Automation products have great potential in the lifting machinery industry

According to statistics, in recent years, the lifting equipment manufacturing industry has maintained an average annual growth rate of more than 30%. Even after the financial crisis hit in 2008, it recovered rapidly in 2009. At the same time, the rapid development of the lifting machinery industry has also greatly promoted the application of automation products in this industry. Although the overall level of automation applications in China's lifting machinery industry is still not high, both hoisting machinery manufacturers and lifting machinery users have gradually realized the advantages of application automation products. Luo Wenlong, director of the Technical Center of the Building Construction Mechanization Research Branch of the Chinese Academy of Building Research, said in an interview that the application potential of automation products in the lifting machinery industry is very large and the prospects are also very broad. The development of the rotary kiln industry for the domestic lifting machinery automation market will follow suit. It's "on the fly." Whether it is the trend of a more mature and modern city, or the economic crisis, the country’s stimulating investment in infrastructure construction shows the booming development of lifting machinery. From control to transmission, the depth of application of automation products in this industry is also accumulating. From the perspective of the existing scale, the future growth space and the current growth rate, the lifting machinery industry has gradually become an important market for automation companies.

Since the 1980s, China's tower crane industry has developed rapidly. In recent years, tower crane sales have continued to climb. However, it cannot be ignored that domestic models are more concentrated and the pressure of market competition is great, which is not conducive to the development of the industry. This requires a series of reforms. At the same time, product quality is uneven, cement equipment such as steam dryers and white ash rotary kiln, market access restrictions are not strict. In the new standard, the scope of use of the standard has been expanded to facilitate international integration. At the same time, some institutional requirements, technical requirements for safety devices, etc. have also been added. This will, to a certain extent, increase the weight of domestic products in international competition. The tower crane is a rotary crane with a boom mounted on the upper part of the tower. Its operation space is large. It is mainly used for the vertical and horizontal conveyance of materials and the installation of building components in the construction of a house. The main mechanisms of tower cranes include lifting mechanism, luffing mechanism, trolley hauling mechanism, slewing mechanism and trolley running mechanism.

For the development direction of PLC products in the lifting machinery industry, first of all, under the premise of satisfying the technological conditions, it is recommended to use PLCs that have already been used, so that it is convenient for future maintenance and resource sharing can also be achieved; under normal circumstances, limit There are no strict requirements on the switching signals provided by external electrical components such as switches and proximity switches. Therefore, the general cable can be used. In the case of far signal transmission, shielded cables can be used; most of the PLC control system failure rate is caused by the external sensor failure, especially the failure rate of some mechanical type limit switches and limit switches is often higher than the PLC itself. The failure rate is much higher, so corresponding measures should be taken when designing the control system. For example, high-performance proximity switches are used instead of mechanical type travel limit switches.

Mobile crushing station, metallurgical rotary kiln, compound crusher and other stone crushing, stone milling equipment. The mobile crusher, active lime rotary kiln and other drying equipment, currently only a few large-scale enterprises in China's lifting machinery manufacturing enterprises have a better medium and long-term production and operation plan, many small and medium-sized enterprises do not have a good medium and long-term production and management plan, which is To a certain extent, it restricts the development of lifting machinery enterprises. In the hoisting machinery manufacturing enterprises, the contents of informatization generally include such contents as management information, engineering design information, manufacturing automation, and quality assurance information.

Most tower cranes in China are small and medium-sized tower cranes. Since the overall cost of most small and medium-sized tower cranes is not high, if inverters, PLCs, and other automation products are used, the cost will be significantly increased, resulting in the current automation of the tower crane industry. The application rate is very low. In the overall tower crane market, the application rate of the frequency converter is approximately 11.2%, and the speed control method is mainly based on double-speed/multi-speed motor speed regulation or series resistance speed regulation. At present, inverters have been widely recognized in tower cranes. Basically, large-scale tower cranes use inverters, and mid-range tower cranes also use inverters. However, the application of mini tower cranes is still very low. Most of the tower cranes use dual-use inverters. Speed ​​/ multi-speed motor speed control or string resistance speed control. Luo Zhuren emphasized that the development trend of large-scale tower cranes will further promote the application of inverters and other automation products. At the same time, the huge potential for the development of mini-turrets also provides a great space for development for the inverters.