General purpose bridge crane 8 tons

Introduction

In the creation of the material and technical base of Ukraine, a significant role is played by lifting and transport engineering, which is tasked with the wide introduction in all areas of the national economy, complex mechanization and automation of production processes, the elimination of manual loading and unloading operations and the elimination of heavy manual labor in the performance of basic and auxiliary technological processes.

The right choice of TMP is the decisive factor for normal operation and high production productivity. It is impossible to ensure its sustainable character at the modern intensification stage without the coordination and failure-free operation of modern means of mechanization of internal and inter-plant transportation of raw materials, semi-finished products and finished products at all stages of processing and storage.

The design, selection and construction of PTM is occupied by engineering and technical workers not only in specialized organizations, but in various sectors of the national economy, in connection with the specific tasks of mechanization and automation of production processes.

PTM mechanisms are used in machines used in various technological processes. Therefore, PTM are of exceptional methodological interest as design objects in the training of engineers and mechanical engineers of a wide profile. Based on PTM, the most important principles of machine design and calculation under conditions of dynamic loads and re-short-term operation, design of light steel structures can be mastered most efficiently.

Description of bridge crane structure

Bridge cranes are the most common types of lifting machines used to service internal and internal cargo flows.

According to the method of supporting the bridge, the designed crane refers to the category of support cranes. The bridge of this double-beam crane consists of two spatially rigid main beams, which adjoin the end (transverse) beams, forming a frame with them in plan. Crane running wheels moving along crane tracks are installed in end beams. The dead weight of the crane bridge and the trolley with the load is transferred through the end beams and running wheels to the crane track.

The main structural shape of the main beams is a box beam with a symmetrically arranged rail. Compared to truss beams, it is somewhat heavier, but the technology for making beams of this type has a number of advantages: it is easier to mark, edit and cut sheets, automatic welding can be used. Horizontal auxiliary beams at beams of box structure are convenient for installation of crane movement mechanism, current-carrying trolls and for passage of maintenance personnel.

In the drive of the load lifting mechanism, the output shaft of the reduction gear is connected to the drum by means of a toothed coupling, the half-coupling of which is built into the drum shell. Torque is transmitted from engine to drum via reduction gear and gear engagement of coupling built into drum shell.

Crane travel mechanism is provided with separate drive. With this version of the drive, there is no long transmission shaft. Each end beam of the bridge is driven by its own drive. Two-flanged wheels are used to hold the crane on the tracks. Couplings of MZP type are used as coupling couplings.

The arrangement scheme of the trolley movement mechanism is a mechanism with a central drive, in which a vertical reduction gear installed in the middle of the trolley is used. Motor is connected with input shaft of reduction gear by means of toothed coupling. Ends of output shaft of reduction gear are connected with shafts of bogie running wheels by means of transmission shafts and toothed couplings. Reduction gear is secured on vertical bridge of bogie frame. It is possible to use a coupling with a brake pulley. This is due to the fact that in the light mode of operation the brake will not be heated and accordingly transfer heat to the toothed half-couplings. Consequently, the thick lubricant embedded in the toothed coupling will not be liquefied and leaked.

Conclusion

During the course project, a general purpose bridge crane was designed. The project uses modern technologies for the production of GPM as well as original design solutions. Improvement of structures of bridge crane mechanisms leads to its more convenient operation.

The course project was carried out using modern computer technology. The use of advanced information technologies has significantly reduced the amount of manual computing, and therefore the time of the project.