Since the broken phenomenon is always appeared in the roof of mine roadway, it largely affects the roadway’s roof stability. With Material Mechanics theory, the authors expound bolt tail subjected to no center load action and roof bolt broken mechanism while roadway is supported with bolts. By theoretical analysis and Lab test, the paper puts forward a kind of new type bolts which may prevent bolt tails from being broken, bolt construction structure’s pattern, and bolt made technology. It is illustrated that the reasonable grading relationship between bolt body’s iameter
and bolt tail’s screw diameter. At same time, the authors compare disturbed values of the thick tail metal bolt and common bolt under the load action. It is verified that roof bolt broken problem may be solved with new type’s thick tail bolt. Therefore, the new type bolts have a wide application in the future.
This paper studies a high-precision measuring method about minimum thickness of thin neck and bending rigidity of flexible bar based on machine vision. The measurement system combines with the advantages of image vision inspection and laser displacement detection. After rough leveling and precise leveling to the clamped workpiece through the interworking of the camera, laser displacement sensor and servo motor, the image of thin neck and the upper profile of workpiece are captured by camera and laser displacement sensor respectively. Then the workpiece is rotated 180 through servo motor so as to capture the image of thin neck again and detect the bottom profile. Based on the two groups of images and profiles acquired above, we can figure out the minimum thickness of thin neck and bending rigidity of the workpiece with high precision. The effectiveness and feasibility of this method are confirmed by computer simulation with ANSYS software and experimental results with needle gauge and flexible bar.
Regional coordinated development trend with the subject of Tianjin and Beijing, as well as the mechanism reform with the orientation of “super ministries system” provide an opportunity for the educational cooperation development around Bohai sea district. Based on higher education development around Bohai sea district and the characteristics of its development, this paper scientifically confirmed the multi-subject system of higher education cooperation around Bohai sea district, constructing the operation system of cooperation subject from macro, moderate and micro levels. On the basis of these, this paper established the “quaternity” cooperation model.
The paper combined with engineering background, Selecting the Pressing gear of CNC crushing Machine Steady Support Body as starting point for Optimization modeling, Analyzed the simple conditions theoretical physical model of Support Body. Reasonably we selected design variables, optimized the Support Body, and obtained relevant data. And analyzed the results, to check the accuracy of the optimize results through the individual histogram map.
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