Study On Bearing Characteristics Of Single Rope Winding Hoist Spindle Device In Downhole

The spindle device is the core component of mine lifting equipment,and its safety and reliability are closely related to mine safety production.In the actual production of the mine,the lifting load of the main shaft device of the winding elevator has large tonnage and time-varying characteristics;secondly,vibration will inevitably occur during the operation of the equipment,and resonance will occur when it is serious.These factors will seriously threaten the safe production of the mine.Therefore,under the support of the National Key R&D Program,this paper carries out the research on the bearing characteristics of the spindle device of the winding hoist.The main contents include:stress characteristics analysis of the spindle device,modal characteristics of spindle device,and fatigue crack characteristics of the spindle device.It aims to explore the stress and vibration characteristics of the main shaft and its key parts under multi-layer winding conditions,reveal the fatigue crack characteristics of the spindle device,and provide a theoretical basis for the optimal design and safe use of the spindle device.Firstly,aiming at the spindle device under multi-layer winding to analyze the stress distribution characteristics of the main shaft device and to establish a finite element static analysis model for exploring the stress distribution of the main shaft device under typical working conditions.Based on the Euler formula to establishe a dynamic analysis model of the spindle devide in the multi-layer winding process,and analyze the dynamic changes of the stress of the main shaft and its key parts.Addtionally,a discrete steel wire rope was constructed by a macro program,and a rigid-flexible coupling analysis model of the spindle device is constructed to explore the stress variation characteristics of the main shaft part under dynamic winding of the steel wire rope.Secondly,aiming at the vibration characteristics of the spindle device,a non-prestressed and pre-stressed spindle device modal analysis model was established to explore the low-order natural frequency and vibration mode of the structure.Established a spindle device modal optimization model to explore the axial support span to the low-order natural frequency.The harmonic response analysis model of the spindle device was constructed to analyze the response of the spindle device under sinusoidal excitation.Then,based on the fatigue damage and crack propagation characteristics of the spindle device,a fatigue damage model of the spindle device was built to explore the life and damage distribution characteristics of the main shaft and its key parts under the precast load spectrum.The numerical distribution of the stress intensity factor K₁on the crack path and the variation of the stress intensity factor K₁ with crack depth and length in different directions were investigated by pre-fabricated elliptical cracks in the spindle and reel.Finally,building a free-mode test rig for the zoom structure of the spindle device,and measuring the low-order free mode of the assembly by the hammering method.Establishing a stress test rig for the structure of the spindle device,simulating the lifting process of the spindle device,and exploring the stress change characteristics of the main shaft,reel and web under the condition of multi-layer dynamic winding of steel wire rope.By comparing the test and simulation results,the reliability of the simulation results is verified.The thesis has 105 charts,13 tables and 86 references.