Structure Design And Simulation Analysis Of Anti Falling Device Of Direct Drive Elevator Safety Gear

The safety anti falling device is the most important protection device in the elevator system.As the core part of the anti falling device,the safety gears will stop the car at the guide rail in case of overspeed,crash and other faults of the elevator,so as to prevent accidents.Therefore,there are high requirements for the structural design and braking performance of safety gear.In this paper,the safety gear in the safety device of the direct drive elevator is taken as the research object.Through the research of its structure and mechanical properties,we hope to provide guidance for the structural design and improvement of the safety gear of the direct drive elevator.Specific research contents include:(1)This paper discusses the background and significance of this study,expounds the research status and structure form of direct drive elevator at home and abroad,and the research results of safety braking of direct drive elevator,and establishes the main research content on this basis.(2)Based on the analysis of the structural characteristics of the elevator safety gear,the double wedge progressive safety gear is established as the braking device of the direct drive elevator.According to the design parameters,the theoretical calculation and the braking reliability analysis are carried out.Combined with the force increasing principle of the wedge,the wedge angle of the sliding block is determined.Finally,the 3D solid model of the safety gear is drawn with Solidworks software.(3)The key components of the safety gear are designed and calculated,the influence of the angle between wedge and safety gear under the condition of self-locking is studied,and the self-locking mechanism of wedge is also studied.The mechanical characteristics of U-shaped leaf spring and the influence of different parameters on the braking performance are simulated.Finally,the vertical and horizontal forces of guide rail under the action of safety gear are deduced.(4)The three-dimensional solid model of safety gear built by SolidWorks is analyzed in ANSYS Workbench to verify that the strength and rigidity of safety gear meet the braking requirements.According to the simulation results,the finite element analysis of the U-shaped leaf spring parts with the largest deformation is carried out,and the safety factor of the U-shaped leaf spring is evaluated from the relevant distribution cloud chart.(5)Because the braking process of elevator belongs to the dynamic ch aracteristic,through the establishment of dynamic simulation model,the dynamic simulation test of the safety caliper braking process is carried out in ADAMS,and the curves of speed,acceleration and distance with time in the braking process are obtained,and the braking performance is analyzed.Finally,the main factors of the safety caliper braking process,such as friction coefficient,initial speed and load,are simulated and analyzed.Through a series of calculation and Simulation Research on elevato r safety gear,this paper provides a reference scheme for the structural design and improvement of safety gear anti falling device of direct drive elevator.