Development Trends of Movable Jib Cranes

The movable jib crane has a larger suspension span and is economical and durable. It is equipped with a built-in travel agency, which is safer and smaller in size, which is especially beneficial to increasing the stroke of the hook. For SEVENCRANE movable jib crane with lifting equipment, all steel plates obtained are placed on the base of the jib. Computer programs currently in use tend to only pay attention to the uniform distribution of longitudinally curved steel bars across the floor of the box girders. Although the longitudinal steel bars are sufficient. However, according to the characteristics of the stress analysis of the actual situation, due to the stress concentration at the root of the cantilever end, the fiber mesh at the roots at both ends gradually decreases.

Conventional design will lead to unreasonable longitudinal stress reinforcement of the cantilever side web, resulting in bending capacity and cracks at the root of the web of the cantilever plate of the box girder. Movable jib crane swing arm suspension is used in engineering applications, and it is in the design that we must take into account the rigidity and strength of the work. Moreover, the cantilever beam of the 360 degree movable jib crane can obtain the maximum deformation through bending under any load, and provides a universal method to obtain the maximum deformation. Mobile jib cranes can also be smoothed by deflecting sections.

The freestanding movable jib crane further develops new transmission components and simplifies the mechanism. The “three-in-one” operating mechanism integrates the motor, reducer and brake into one. It has the advantages of compact structure, lightness and beauty, easy disassembly and assembly, simple adjustment, smooth operation, and wide range of supporting equipment. It has been widely used in various mobile applications abroad on the operating mechanism of the cantilever crane. In order to simplify the structure of small and medium-sized lifting trolleys as much as possible, while reducing the size and height of mobile cantilever cranes and reducing wheel pressure, electric hoists have been widely used as lifting mechanisms abroad. In order to reduce self-weight, increase load-bearing capacity, improve processing and manufacturing conditions, and increase product yield, parts are welded instead of cast as much as possible, such as reducer housings, reels, pulleys and so on are all use welded structures. The reducer gears all use hard tooth surfaces to reduce weight, reduce volume, improve load-bearing capacity, and extend service life. The range of applications of hydraulic push rod disc brakes is also increasing. In addition, the motors used in various mechanisms are developing towards high speeds, thereby reducing the motor base number, weight and overall size, and can be equipped with brakes with small braking torque.

In terms of electronic control, factory direct sale movable jib crane develops speed control systems and electronic control systems with good performance, low cost and high reliability, and develop semi-automatic and fully automatic control. Adopt electromechanical, instrument and hydraulic integration technology to improve performance and reliability, and increase the functionality of the mobile cantilever crane. SEVENCRANE has developed fuzzy logic circuit control technology, using neural information and fuzzy technology to find the best moment to start accelerating, and input the data of experienced drivers’ actual anti-sway operations into the system to achieve optimal control. The fuzzy control method can determine the control instructions for automatic work, and digitally quantify people’s subjective fuzzy quantities through fuzzy sets.