Design And Research On Key Structure And Hydraulic System Of Crawler Hydraulic Anchor Drilling Truck

The production and security of coal resources are closely related to the national energy strategic security,and directly affect the sustainable development of the national economy.Bolt support is an effective way to support underground tunnels in coal mines,which can significantly improve the working environment and safety conditions of miners in underground roadways.Crawler-type hydraulic anchor drill truck is the key equipment for bolt support.Compared with traditional pneumatic drill for bolt,it has the advantages of high speed,low cost and low labor intensity.It has been widely used in coal mine and tunnel construction at home and abroad.At present,the reliability of domestic crawler-type hydraulic anchor drilling rig is low.It only relies on similar machinery for analogy design.There is no independent design method and design idea.The hydraulic control system is complex and poor stability.The above defects restrict the development of crawler-type hydraulic anchor drilling rig,and restrict the construction and operation of mines and tunnels.Therefore,it is of great significance to improve the design quality of bolt drilling rig and optimize the key components and hydraulic control system of the drilling rig for improving the adaptability of mining machinery.In this paper,the crawler hydraulic anchor drilling rig is taken as the research object,and the amplitude-changing mechanism,power head mechanism and hydraulic system are designed,and the key components are simulated by computer.The main contents of this paper are as follows:(1)Analyzing the research status of crawler hydraulic anchor drilling rig,designing and calculating the main functional components and selecting the parameters.The drilling rig is divided into walking module,amplitude-changing module,drilling module and hydraulic system according to its function.The main parameters of the track are calculated according to the requirements of the moving parts of the drilling rig.The amplitude-changing mechanism is designed according to the requirements of the drilling rig's azimuth.The relevant parameters of the hydraulic cylinder are calculated.The hydraulic system is designed according to the performance requirements,and the parameters of the system are calculated to complete the selection of key components.(2)Check and simulate the structure of the luffing device of the crawler-type hydraulic anchor drilling rig.After establishing the three-dimensional model,kinematics simulation,dynamics simulation and modal analysis are carried out to find out the weak parts of the support frame of the luffing mechanism.The results show that the strength and stiffness of the luffing mechanism meet the design requirements.(3)The hydraulic system simulation model of crawler-type hydraulic anchor drilling rig is established.The model is divided into luffing system module,feed system module,crawler walking and platform rotating module and load-sensitive pump feeding module.The hydraulic motor driving crawler walking is simulated,and the executing components of each functional module are analyzed whether they can fulfill the established working objectives.From the simulation drawings,it can be seen that the designed hydraulic system has strong stability,high mechanical efficiency and good dynamic performance.It can complete the walking,raising and drilling of crawler-type anchor drilling rig.(4)Topology optimization analysis is carried out on the intermediate support frame of the amplitude-changing mechanism.According to the analysis results,the structure of the support frame is improved,the three-dimensional model is optimized,the static analysis and modal analysis are repeated.The results of finite element analysis show that the maximum deformation of the structure is reduced,the strength and stiffness of the structure are increased,and the natural frequencies of each order are increased,which verifies the reliability of the amplitude-changing system.