Design On Hydraulic Lifting And Descending Mechanical System For Large-scale And Heavyburden Fire Test Facility

Fire comes into being with the discover and use of the fire, which is bound up with the development of human civilization. The rapid development of the society has a remarkable effect on the ways of producing and life to people. With the increasing of places where have many people, dangerous and have large-scale and complex buildings, and the use of new technology, new material, new technics, and new energy sources add the factor and risk of fire. From the trend of the development of international and domestic fire science development, for studying the principle of the fire, finding new fire-resistant material, need entitative fire test.Fire Test of large space is one of the most important fire tests. In order to simulate the fire scene more actually, in which doing a series of fire tests, we can use lift system to control the height of the test ceiling accurately, simulating the ceiling height of real building facilities.Based on the request of Tianjin Fire Research Institute, have designed hydraulic lifting and descending mechanical system. This system can drive a 33 meter×33 meter and 75 ton's full loading facility lifting and descending from 3 meter height to 24 meter height and orientate at any height. The system can also control the facility real-time, has the function that the speed can be accommodated proportionally. And the system is reliable, multifunctional and secure. It can satisfy the need of entitative fire test.The content of this paper can be divided into six chapters. The summary of each chapter is as follows:In chapter 1, it gives a review of develop tends of the fire test and the status-quo of the relating technology research on lift system domestic and abroad. This chapter also gives a description of the necessity having fire test in a real scene and brings out the research's target and meaning against the lift system.In chapter 2, the features and technical requirement of the load are analyzed. Compared with the features of gear-rack type, winch type and hydraulic type these three lifting modes in the condition of the large heavy-duty, five whole structure arrangement schemes are proposed. After demonstration, we selected an arrangement scheme that four cylinder side-arrangement, 2:1 mechanical counterweight. In this chapter, an electro-hydraulic proportional synchronization scheme is proposed based on the master-slave control policy, and the key technology of the lift system is also analyzed.In chapter 3, based on design requirements, the mechanism of lift system have been designed, which consists of lift-up, balance weight, lifting and safeguard. With CAD software Solidworks, an integrated design of the system mechanism is accomplished.In chapter 4, some important components are analyzed using FEM, which improved the reliability and stability of the system.In chapter 5, the hydraulic part of lift system has been designed and calculated and its working principle is introduced. Hydraulic components are also designed and calculated.In chapter 6, the summary of the whole work and the prospect in the future are proposed.