Research On Cooling Performance Of Shearer Rocker Arm

The shearer is an important mining equipment during the process of coal mining.With the powers of shearer are increased in thin coal seam continuously,heat dissipation spaces are limited,which lead a large amount of heat during power transmission on the gear of the radial arm cannot be dissipated.High temperature leads viscosity decreases of lubricating oil,it triggers series reliability problems on the gear wear,bearing wear and radial arm oil leakage,etc.Recently,the water channel in the radial arm shells and the cooling tube in the radial arms cannot satisfy the requirement of heat dissipation for thin coal seam shearers.It is urgent to strengthen the heat dissipation efficiency by improving the heat exchange methods.The main research contents and the achievements of this paper are as follows:1.The numerical simulation method was used to study the heat transfer characteristics and resistance characteristics of different structures of the radial arm shell channel.By comparison,it was found that the semicircular arc spoiler arranged on the left and right wall of the radial arm channel has the best comprehensive heat transfer efficiency.The control variable method is used to study the influence of the structure parameters of the semicircular arc spoiler on the flow characteristics and heat transfer characteristics of the radial arm shell channel.By comparing the improved channel with the existing radial arm shell channel,the heat dissipation performance of the channel was improved by about 30% while the pressure was dropped by 60%.2.The numerical calculation method was used to explore the heat transfer characteristics and resistance characteristics of the cooling round tube and trabecular vessel.Also,the influence of the structure parameters of the trabecular vessel on the heat transfer characteristics is studied.By comparing the improved channel with the existing shearer cooling channel groups,the improved dissipation efficiency was increased about 60%.3.The experimental system is designed to verify the accuracy of the numerical calculation.Though comparative experiments,the heat transfer efficiency of the improved structure is increased by about 30%.