| Hydraulic drills have been widely used in highway and railway tunnelprojects with big sections. While in the rock tunnel drilling process inunderground mines, the traditional means of pneumatic drilling, manualexplosion and raking off the slag are mainly used. The efficiency of drilling isvery low, and workers face great risk while working in front of the drillingsurface without any support. The demand of tunneling crawler from workingunits shows the steady rising tendency. It is a must to research and developthe new generation all hydraulic drills, upgrade the mechanization of tunneldrilling equipment, accelerate the drilling speed and lower the labor tensionof workers.The subject of this paper is a research and discussion in summary for theCMJ17HT all hydraulic crawler. And the limited analysis software of ANSYS isused to carry out an analysis of constructional dynamics for the major partslike drilling arms;the design of the crawler is also tested and confirmed. Themajor content is as follows: 1. The means of a drilling crawler's function.A brief introduction of the importance and function for a drillingcrawler in mining production. The drilling work is the first procedure inmining production, the development of a mine could not be done withoutdrilling holes. Any kind of hole-drilling is the first procedure for the wholeproject. The total production of a mine would be delayed if the drillingprocess was lagged off. The demand for hydraulic crawler is growing alongside with the better understanding of the working units. It is a necessarychoice to develop a new generation all hydraulic crawler so as to upgrade themechanization of tunnel drilling equipment, accelerate the drilling speed andlower the labor tension and risk of injury.2. The structure of a drilling crawler.Please see picture 1 for the structure. The whole unit is composed by:(1) Caterpillar assembly (2) lower part (3) Boom assembly (4) propellingsystem assembly (5) drill rod (6) power system (7) electrical system (8)hydraulic system.The propelling unit, its function is to propel and withdraw the rock drillwhile drilling the rock, and provide the drill rod with sufficient thrust.Support bracket, the support bracket is a mechanism combining drillarm and propelling unit. There is a slider supporting the propelling unit alongthe guide track. The left side of the support bracket is linked to the drill armwith hinges. With the functions of swing cylinder and up-and-down cylinder,the propelling unit moves up and down and horizontally.Compensation system, the compensating cylinder is fixed between thesupport bracket and propelling unit. One end is hinged with the supportbracket and the other end is hinged with the propelling unit, thus acompensation system is formed. Its function is to make the propelling unitfinish to-and-fro motion. The compensation system could make thepropelling unit contacting the rock surface while drilling the whole sectionarea, and guarantee the stability when drilling holes.Drill arm, the drill arm is an essential part of the crawler. It supports andmoves the propelling unit, so the rock drill, which mounted on the propellingunit, can drill holes with different positions and angles effectively.The lower part is the base of support for the whole crawler. The powersystem (Hydraulic, electric, water supply and wind supply systems),operating cab, caterpillar assembly and supporting shoes are fixed on it. Thecrawler body is also a part of the hydraulic oil tank.3. The analytic process of structural dynamics of the boomThe analytic process of this subject is(1) Pro/E software is used to set up a simplified 3-D model of the crawler4 3 2 6 8 7Picture 15 1boom.(2) The joint of Pro/E and ANASYS software is used to introduce thefinished boom model into ANASYS.3) By using the pro process module of ANASYS software, the unit typePicture 2Picture 3setting, grid setting and the setting of DOF control and loading arecarried out.(4) The answering machine of ANASYS is used for results.(5) The post process module of ANASYS shows the results.Please see the picture 2 for the equivalent relocation chart, the red part isthe max relocation, the blue is min relocation.Please see the picture 3 for the equivalent stress chart, the max stress is112.213MP. The max stress spot is marked with MX.4. The content and result of the researchThe 3-D CAD software of Pro/Engineer and ANSYS, the general-duty FEAanalysis software are used to analyze the structural static and modality. Themodern way of design in industrial design has also been discussed, includingby using Pro/Engineer software to set up models and ANSYS to carry outstructural static and modality analysis. The major research and results areas follows:1. The paper generally analysis the main functions and characteristics ofthe very popular CAD/CAM/CAE integration software -Pro/Engineer.2. The paper generally introduces the development of CAE and the maintechnical characteristics of ANSYS, the FEA analysis software.3. Discussion of the design of tunnel crawler.4. It is accurate, plain and easy to amend the design of tunnel crawler byusing Pro/Engineer to carry out 3-D design. Even on the design stage, theright or wrong of the structure can be judged so the efficiency of design ishighly upgraded.5. The ANSYS is chosen to carry out static analysis of the boom, andthen the modality analysis is done on this basis, thus the layout of the drillarm's equivalent stress and the characteristics of the fiscal model areunderstood. And all these has provided a theoretical base for theimprovement of the next step design.
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