The development trend of new type and practical use of cranes
Time:
2021-09-07 10:34
With the continuous development of science and technology, cranes are also constantly developing and progressing. Today we will talk about the new and practical development trend of cranes.
In terms of structure, the crane adopts thin-walled profiles and special-shaped steel to reduce the splicing welds of the structure and improve the fatigue resistance. Various high-strength low-alloy steel new materials are used to improve the bearing capacity, improve the stress conditions, reduce the self-weight and increase the appearance. The bridge structure of bridge cranes mostly adopts box-shaped four-beam structure, and the main beam and end beam are connected by high-strength bolts, which is convenient for transportation and installation.
The crane further develops new transmission parts and simplifies the mechanism. "Three-in-one" operation mechanism is a combination of motor, reducer and brake, which has the advantages of compact structure, light and beautiful, convenient disassembly and assembly, simple adjustment, stable operation, and large matching range. It has been widely used in various cranes abroad. on the operating mechanism. In order to simplify the structure of hoisting trolleys of medium and small tonnage as much as possible, and at the same time reduce the size and height of the crane and reduce the wheel pressure, a large number of electric hoists have been used abroad as the hoisting mechanism. In order to reduce the self-weight, improve the bearing capacity, improve the processing and manufacturing conditions, and increase the product yield, the parts are cast by welding as much as possible. The gears of the reducer are all hardened to reduce the weight, reduce the volume, improve the bearing capacity and increase the service life. The application range of hydraulic push rod disc brakes is also increasing. In addition, the motors used in each mechanism are developed to high speed, thereby reducing the size of the motor base, reducing the weight and size, and can be equipped with a brake with a small braking torque.
In terms of electronic control, cranes develop speed control systems and electronic control systems with good performance, low cost and high reliability, and develop semi-automatic and fully automatic operation. The use of electromechanical, instrument and liquid integration technology improves the performance and reliability, and increases the function of the crane. The control technology of fuzzy logic circuit is developed, and neural information and fuzzy technology are used to find the best moment to start acceleration, and the data of the actual operation of anti-swing by experienced drivers is input into the system to achieve optimal control. The fuzzy control method can determine the control instructions to implement automatic work, and digitally quantify the subjective fuzzy quantity of people through the fuzzy set.
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