Study On Structure Optimization Of The Derrick Of JYD-1000 All-hydraulic Core Drilling Rig

Along with the flourish development of our economy construction, the assignment of mineral resources exploration, water conservancy construction, prevention and cure of geological casualty and environment pollution is gradual heavy. Quantity demanded and operation requirements of geotechnical equipment are gradual elevation. In order to satisfy the requirement of geotechnical machine, the core-drilling machine of complete hydraulic pressure JYD-1000 is developed.The function of JYD-1000 is all activated and controlled by hydraulic pressure. The merits of JYD-1000 are as following: First, operation and control are exact; Second, equipment can realize compression drilling, decompression drilling, weighing, and advancement fast; Third, gyroscopic mechanism can realize infinite speed variation between zero and 1200 turns per minute, and a rather larger moment of torque; Forth, drilling rig can suit many kinds of construction technology such as wire-line core drilling with diamond, air foam drilling, hydrodynamic percussion-rotary drilling and continuous wire-line drilling of reverse circulation; Fifth, drilling rig can satisfy the needs of resource exploration and development of oil shale, coal gas, geothermy and deep-resource of imminence mining area, the depth of which is within 1300 meters; Sixth, it realizes the replacement of geology core-drilling machine, increases the efficiency and security of deep-resources exploration greatly.The emphasis of the paper is on drill tower, the corollary equipment of JYD-1000. The drill tower can be divided to up and down sections, its design height is nine meters, and the biggest angle is 45 degree. It is fabricated by rectangular pipe steel and square pipe steel. Adopted analogism, the design of drill tower can satisfy the operating requirements, but lead to some structure defects, such as little assurance structure stability, material waste, larger dead load, inconvenient carriage and higher cost. In order to satisfy the operating requirements, ANSYS software is adopted in the paper to calculate the static strength of finite element, analyze the stress and deforming of member bar of drill tower. On the basis of original structure of drill tower, dimension optimum design of member bar is preceded, which can realize the purpose of reduction dead load.The main work of the paper is as following:First, analyze the stress of drill tower under normal drilling and advancement when jamming of a drilling tool. While drilling, the foot of dill tower is suffered two kinds of stress, one is reaction torque applied by turned around drilling tool; the other is torque reaction applied by compression rack when drilling. When advancement under jamming of a drilling tool, the foot of drill tower is mainly suffered torque reaction and the biggest torque of compression rack created by the biggest advancement. Through calculation, the carrying power of drill tower foot is checked simply.Second, to create model, the ANSYS software is adopted. The mechanical model is three-dimensional girder construction. Because of the complex structure and operating mode, much of simplify working process is adopted when creating model. Beam4 of ANSYS software is used to discrete the finite element. Based on actual service condition of drill tower, the analytical calculations of finite element is proceed, when power head is on different place under operating mode of normal drilling and advancement when jamming of a drilling tool. Through calculation, stress level, stress distribution and deforming of drill tower under different operating mode can be got. At the same time, quantitative analysis of carrying power of drill tower is give. All of these are the reference and basis of design and improvement of drill tower.Third, against the conclusion of finite element analysis, field experiment analysis of drill tower is proceeded against. Used static strain indicator and admeasuring apparatus, stress and deforming of every member bar can be measured Analyze the data of field experiment. In view of the difference of field experiment and simulation, so the test data is concordance with the data of finite element analysis.Forth, through the analysis of finite element and field experiment, it is can be see that, every member bar does not get the mechanical limit, to get the structure optimum design of light weight, finite element is adopted. On the basis of no alternation the structure of drill tower, taking intensity as constraint condition, sectional dimension optimization of member bar is put up, and then the rigidity of drill tower is checked. The result of optimization indicates that, when the intensity and rigidity are the same with the original drill tower, the dead load of drill tower is reduced by 49.7%. The effect of light weight is well.The research of this paper provides the reference and basis for the design of drill tower, solves the no rationality of analogical design. At the same time, it provides a new idea of optimization design, specific route of feasibility, a good draw lessons for the same research.