Research On The Design Of The Quick Release Device Featured By Heavy Load

With the number of the elevator increase in China,the safety of the elevator has been paid much more attention to in recent years.Usually,an elevator is mainly comprised of a cab(also referred to as a car),guard rails,safety gears and buffers,and other components.The safety gears and buffers,which are adopted to prevent the physical harm to passengers in the elevator,are regarded as the most important safety devices of an elevator.According to the standard GB 7588-7588,used in manufacturing and installing the elevator,the safety devices need to be tested before finalizing the design.To perform the above tests mentioned in the standard,a free fall of an elevator cab should be realized firstly.Thus,the release mechanism is used conduct this experiment in which safety gears and buffers used in elevators are tested.A novel self-locking quick release mechanism featured by heavy load,fast response and high security is proposed,designed and evaluated.The load capability of this mechanism is high up to 15 tons.The characteristics of fast response and high security attributed to structural parameters and the butting-shaped self-locking respectively are the essential issues of the mechanism.Each chapter of this paper is outlined as follows:In chapter 1,the research background is introduced first,then the present study and the fu-ture development of the quick release device is introduced.Finally,the significance and main research contents are presented.In chapter 2,according to the design background,functional analysis is carried out first,then the mechanical structure and hydraulic system are designed.At the same time,a 3D model of the proposed mechanism is elaborated for design,evaluation and simulation purposes.Finally,the device which has been completely product is introduced,and the advantages of the equip-ment are summarized.In chapter 3,the research includes the kinematic equations and force analysis to gain in-sights into the mechanical behavior of the mechanism.The principle of the butting-shaped self-locking is illustrated with the method of virtual work to obtain the critical equilibrium con-dition while this novel mechanism is not in the ideal position.Finite element method is em-ployed to implement the stress and deformation analysis when the mechanism grasps an object of 15 tons tightly.In chapter 4,firstly the acceleration model of an elevator cab is deduced.Secondly,a dy-namic model of the device and a hydraulic model of the hydraulic system are set up.And based on these models,a multi-disciplinary joint simulation is carried out to evaluate the validity of the proposed mechanism.In chapter 5,the evaluation of the proposed mechanism is presented by experiments.The fast response characteristic of the self-locking quick release mechanism is figured out in terms of release time.The test results show that the device meets the design indicators.In chapter 6,some conclusions about the understanding of the self-locking quick release mechanism are proposed,and some future research directions are suggested.