Design And Analysis On Hydraulic System Of Top Drive Head Of Core Drilling Rig

Core drilling is an indispensable part in the process of geological survey, core drillingrig is the important equipment for drilling. Hydraulic core drilling rig has become themajor model, but the research on drilling rig for deep hole is less in domestic area.This thesis relies on the sub-topic research which studies on hydraulic core drilling fordeep hole, national project of deep drilling for scientific research. Based onconstructive conditions, drilling technololgy and reqirements for core’s quality,make a design of hydraulic system and analyse it.The thesis consists four parts as followings:1、Determine main parameters of top drive head though describing main functions ofit, provide evidents for hydraulic system design. Compared with the other speedcontroling methods, make the combination of variable pump-variable motor as thehydraulic loop to control rotating speed.2、According to requirements of the system,calculate parameters of hydrauliccomponents.3、Discribe the principles and analyse advantages and disadvantages of two loadsensing hydraulic systems, combined the requirements of controling and based ondata, make a reasonable choice to select components which have load sensitiveability.4、Use the MATLAB/Simulink to simulate the system,give a reasonable evidents forthe design though simulate and analysis the stability of hydraulic system.In this thesis,make speed controling method which make of variable pump haselectro-hydraulic control with proportional solenoid (EP) and EP variable motor,thechange of the displacements links with loading pressure,make sure the system cansupply a large range of rotary speed stepless, adapt to system of loading pressure independent flow distribution to suit for the motions. Hydraulic system’s performanceget better, the power of the pump is efficient, the work efficiency also get higher.