Stress Analysis of Large Diameter Pipe Interface Structure of Boiler Main Steam Pipe
Chen Ye,
Zheng Nenghong,
Yang Rui,
Xia Fengbing,
Liu Tao,
Huang Renjie,
Chai Lijun
Issue:
Volume 12, Issue 1, March 2023
Pages:
1-6
Received:
17 March 2023
Accepted:
6 May 2023
Published:
18 May 2023
Abstract: The “four tubes” safety of the boiler is related to the economic and safe operation of the boiler. In order to ensure the safety of boiler steam pipe large diameter nozzle welding place, the structural stress analysis of the special large-aperture nozzle pipeline designed in a boiler enterprise's design process is studied in this paper. In the case, the allowable angle of the pipeline exceeds the direct calculation range of JB4732-1995, therefore, the ANSYS finite element analysis method is used to calculate the structural stress of the pipeline, and the stress evaluation is carried out. The results show that the finite element method can effectively calculate the pipeline structure's stress calculation. In order to meet the requirements of JB 4732-1995 for the evaluation of various types of stress intensity step by step, the film bending stress is treated as SIII, and the conservative treatment is controlled by 1.5Sm, therefore, the finite element analysis results of the pipeline show that the maximum equivalent stress is 176.22 MPa, which is located at the connection between the large nozzle and the main pipe, and the larger the diameter of the pipe nozzle, the higher the equivalent stress. The stress evaluation results of the pipeline are evaluated according to the third stress intensity, and the strength of the analyzed parts meets the standard requirements.
Abstract: The “four tubes” safety of the boiler is related to the economic and safe operation of the boiler. In order to ensure the safety of boiler steam pipe large diameter nozzle welding place, the structural stress analysis of the special large-aperture nozzle pipeline designed in a boiler enterprise's design process is studied in this paper. In the case...
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Development and Optimization of Traction System for Heavy Engineering Machinery
Issue:
Volume 12, Issue 1, March 2023
Pages:
7-11
Received:
10 April 2023
Accepted:
8 May 2023
Published:
18 May 2023
Abstract: The traction system of heavy equipment is a key part of the heavy engineering machinery and the traction ability of the heavy engineering machinery have high requirements for the overload capacity, reliability, maintainability, cost, and other aspects of the walking part. With the development of electrohydraulic technology, the traction technology of heavy equipment has also been continuously improved and the driving mode of the traction part has also developed from hydraulic driving to AC variable frequency driving. Engineering machinery is early generally driven by a fuel engine through a transmission shaft, gearbox, drive axle, and wheel reducer to complete the equipment. Heavy truck, bulldozer, tunneling machines, anchor excavators and shuttle trucks are commonly used heavy equipment in mechanized mining and rapid excavation of mines. Their traction performance plays a crucial role in improving the efficiency of working face excavation. This paper introduces the traction system of heavy equipment and compares the hydraulic drive system and electric traction drive system for them. The design scheme of the electric control system and the traction converter system is analyzed and a optimization scheme of the traction converter system is proposed. The optimized frequency converter adopts a modular assembly structure, which is convenient for installation, debugging, and after-sales service. Field application shows that the optimized frequency conversion system improves production efficiency and reduces failure rate.
Abstract: The traction system of heavy equipment is a key part of the heavy engineering machinery and the traction ability of the heavy engineering machinery have high requirements for the overload capacity, reliability, maintainability, cost, and other aspects of the walking part. With the development of electrohydraulic technology, the traction technology ...
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