外文翻译-大倾角工作面液压支架的四杆机构的设计.doc

1、翻译部分英文原文The Design of Four-bar Linkage of Large Inclined Angle Hydraulic SupportAbstract- Four-bar linkage is one of the most importantcomponents of shield-type powered support or chock-shield-typehydraulic support. Parameterized modeling, simulation andoptimization of four-bar linkage is firstly ac

2、complished by use ofADAMS software in designing a large inclined angle hydraulicsupport. Then based on three-dimension model of the wholehydraulic support, applying COSMOS/Works software, finiteelement analysis is made under the front torsion load of roof beam.The analysis result validates the feasi

3、bility of four-bar linkagedesign and meets the design requirements very well. This methodcan effectively shorten the design cycle and improve designefficiency of hydraulic support.Keyword-hydraulic support; four-bar linkage; optimizationdesign; ADAMS; finite element analysis1. IntroductionFour-bar l

4、inkage is one of the most importantcomponents of shield-type hydraulic support orchock-shield-type hydraulic support. Its function has twoaspects: One, as the support legs rises or lowers, the leadingedge of roof beam moves up and down nearly vertically,thus maintaining a nearly constant unsupported

5、 distancebetween the coal wall and the leading edge of roof beam.This is a feature that is widely considered most desirable forgood roof control. Second, it makes the support to becapable of bearing larger horizontal load.In designing a large inclined angle hydraulic support,optimization of the four

6、-link design is an important work.The size of four-bar linkage directly influences theperformance and status of hydraulic support. In thetraditional four-bar linkage design, BASIC program is usedto compute 1, but the results often can not meet the designrequirements and can not obtain the optimal so

7、lution.Currently, ADAMS software is more and more applied inthe mechanical dynamics field 2. So, the paper makes useof the ADAMS software to model and simulate thefour-bar linkage in order to achieve the optimal designsolution3-4. In order to validate the feasibility of four-barlinkage design5, appl

8、ying COSMOS/Works software,finite element analysis is made.2. Dimension calculation of four-bar linkageAs shown in Fig. 1, is the calculation height in themaximum position. Mathematically, the parameters offour-bar linkage is supposed that:Figure 1. Parameters of four-bar linkage2.1 The calculation

9、of rear bar and shield beamAs shown in Fig. 2, if H1 is determined, the length ofshield beam is: （1） (1)The length of rear bar􀋖A=IG （2）The distance between top link point of front bar and top linkpoint of rear bar is:B=I1G （3）The distance between top link point of front bar and top linkpoin

10、t of shield beam is:F=G-B （4）The distance between bottom link point of rear barand origin of coordinates is , as shown in Fig. 2. 1 E2.2 The Calculation of length and angle of front bar1) Coordinate of 1 point bWhen the support is in the highest position , thecoordinate of point is: X1=FCOS（P1） （5）

11、y1=H1-FSIN(P1) （6）􀒏Figure 2. Geometrical relationship of four-bar linkage2) Coordinate of 2 point bWhen the support is in the lowest position , thecoordinate of point is: （7） （8）When the support is in the lowest position, 􀂕2530,according to the geometric requirements.Mathematically

12、, it is supposed that . （9）3) Coordinate of 3 point bWhen it is right-angle between shield beam and rearbar, the coordinate of 3 point is: b （10） （11） （12） （13）4) Coordinate of c point is the length of front bar. So thelength of front bar can be calculated by use of the equationof circle. The coordi

13、nate of c point is: （14） （15）The length and angle of front bar can be calculated afterdetermining the coordinate of c point.2.3 The calculation of the height D of the front barbottom link point, and the projective distance E onthe base between bottom link point of front bar andbottom link point of r

14、ear barAfter calculating the coordinate of c point, the height Dand length E is: （16） （17）As to the top coal caving hydraulic support that themaximum supported height is 2600mm, the supportedheight properly should be increased in order to meet thedesign requirements of hydraulic support in deeply inclinedcoal seam, the calculation height H1 is increased to 2118mm.By use of the program that sloping line is thought as theobjective function, the below result can be obtained.tan􀁔 = 0.338, Q1= 75.10, Q2= 29.98,P1= 59.96, P2= 15.09, A= 988.78mm,