| In the current comprehensive mechanized excavation operation,the road header is usually equipped with a narrow-body anchor bolt and anchor cable drill vehicle,so as to realize the front excavation and the rear anchor,and the alternate operation in sections.Among them,most of the narrow-body anchor bolt and anchor cable drill vehicle use crawler chassis.In order to expand the cyclic construction process of road header + narrow-body anchor bolt and anchor cable drill vehicle in the single-lane tunneling and crossing operation,a six-wheel drive wheel type is designed.The driving adaptability of anchor bolt and anchor cable drill vehicle to complex road in coal mine roadway is analyzed.The lubrication characteristics of the chassis transmission system are also studied.Firstly,the 3D model of the anchor bolt and anchor cable drill vehicle chassis is designed by using SolidWorks.Detailed design calculations for gears,sprockets and chains in the chassis drive system.The vehicle frame,chain,sprocket and gear of the chassis are statically analyzed by using Workbench,and the transient dynamic analysis of the gear is also carried out.The research results show that the designed chassis components meet the strength requirements.Secondly,according to the driving theory of wheeled vehicles,the dynamic model of anchor bolt and anchor cable drill vehicle chassis and the mechanical model of the interaction between the tire and the soil are reconstructed in ADAMS.The force and motion of a single wheel are analyzed,and the grounding specific pressure of middle wheel,rear wheel and front wheel are calculated;according to the power flow theory,a mathematical model of the power flow under the six-wheel drive condition is constructed,and the effect of the place of the center of gravity on the distribution of the axle load of the anchor bolt and anchor cable drill vehicle is analyzed.Due to the uncoordinated motion of front wheel,middle wheel and rear wheel,parasitic power is generated,so the parasitic power of the anchor bolt and anchor cable drill vehicle is studied.The results show that the grounding specific pressure of front wheel,middle wheel and rear wheel are all less than the maximum allowable grounding specific pressure;the value of the driving power of front,middle and rear wheels depends on the axle load by the wheels.When the ratio of the total load is 46.6%,31.9%,and 21.4%,the power consumption is also around this ratio.The direction of the parasitic power is from the slipped wheel to the slipping wheel.Thirdly,in order to study driving adaptability of the anchor bolt and anchor cable drill vehicle on the coal and rock road,a simulation method is proposed,in which the slip state of the driving wheel submerged in the coal slime water is equivalent to the follow-up state of the driven wheel,and anchor bolt and anchor cable drill vehicle is established.The dynamic model of the anchor bolt and anchor cable drill vehicle in the state of four-wheel drive two-wheel slip and two-wheel drive four-wheel slip is established.According to the power flow theory,the stress state of the chain under the conditions of six-wheel drive,four-wheel drive two-wheel slip and two-wheel drive four-wheel slip are analyzed,and the flow of power in the transmission system is clarified.The research results show that the force ratio of the front and rear transmission chain links is equal to the transmission power ratio of the front and rear transmission chains.Under the three set working conditions,anchor bolt and anchor cable drill vehicle can drive normally,which verifies that the six-wheel drive narrow anchor bolt and anchor cable drill vehicle has strong driving adaptability to uneven roads.Finally,the lubrication flow field and thermal field inside the chassis longitudinal beam transmission system are studied.Using VOF two-phase flow theory,turbulent flow model,and dynamic mesh model to establish the fluid dynamics model of the transmission system.The flow field inside the longitudinal beam and the effective amount of lubricating oil that can be effectively lubricated by the output gear of the reducer are analyzed.Based on the theory of heat transfer,the power loss of the chassis transmission system and the convective heat transfer coefficient of each part of the chassis transmission system are calculated,and the calculated heat is loaded on the boundary of the gear and sprocket in the form of a volume heat source.Using SMM model in fluent,the fluid-thermal coupling simulation is carried out inside chassis the transmission system,and the presence or absence of lubricating oil inside the longitudinal beam box is co MPared.The research results show that the critical rotational speed for the output gear of the reducer to be lubricated is 23 r/min,and the critical oil immersion depth is 125 mm;the temperature rise rate of the longitudinal beam box with lubricating oil is significantly smaller than that of the longitudinal beam box without lubricating oil temperature rise rate.In this thesis,a new type of 6×6 narrow anchor bolt and anchor cable drill vehicle chassis is designed,and the road adaptability of the anchor bolt and anchor cable drill vehicle and the lubrication characteristics of the chassis transmission system are studied.The feasibility of applying the 6×6 wheeled chassis to the anchor bolt and anchor cable drill vehicle is verified,and it provides a certain reference for the design of the narrow anchor bolt and anchor cable drill vehicle. |
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