| In this paper, coordinate systems of cantilever-type roadheader and the cutting head were established based on cutting mechanism of the cantilever-type roadheader conicial bits. the trajectory, volume cutting by one bit, dynamic and static parameters of bits were analyzed and fitted based on the coordinate systems, cutting head bits distribution were optimized for equal cutting volume of all bits by computer-aided analysis and design software.The trajectory of roadheader bits were calculated based on the built roadheader mathematical model by matlab software. The simplified algorithm of bits swing trajectory were given, and proved to be able to meet the requirements of the mine rock-breaking with high accuracy by comparing the error between the original algorithm and the simplified algorithm. The mathematical rocks cutting model of cutting head were established, solved by computer using calculus. Rock volume cutting by one bit in the work process were quantitatively calculated, and bits distribution was designed to make rocks volume cutting by all bits equaled. On this premise, the author believes that every bit should make the rock volume cutting by all bits in a work period equal, and its work force minimal. The installation angle of bit determines its stress distribution when working, the SolidWorks/COSMOS software was used for analying and simulating bit's work force to adjust the installation angle to minimize the stress on bit. Dynamic working angles also affect the cutting rock volume, in which cutting angle and clearance angle have a greater impact. They have the same trend as linear relationship between them. The expression of cutting angle was derived in this paper, and the simulation curve was plotted by joint programming with Lab VIEW and Matlab.Figure 60 Table 5 Reference 58... |
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