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PE600 × 900 Jaw Crusher spring rod Fracture Analysis and Improvement


- Moving to its lower jaw hung from the center,[link widoczny dla zalogowanych], m, L = 1.722; 0 - moving jaw width, m, 0 = O. 8; e - eccentricity, m, e = 0.019m; ・ 52 ・ hard not exposed rice Mine No. 3 of 2007 children - Eccentric shaft speed, r / min, children = 270. Generation type (3) (4) obtained = 4267.5kg. m2 = 101 / s is Ml == 4267.5xl0 = 42675N ・ m = a Gr = a 23200X0.178 = 4130N ・ m moving jaw of a hanging point on the torque of 0 and for M = M1 + = 42675-4130 = 38545N ・ m thus obtained the maximum compression force of spring Po = MK / Lo where: P0 to the suspension point of a vertical distance, m, Lo = 1.3; K - safety factor K = 1.8. Then Po = 38545 × 1.8/1.3 = 53370N Clearly,[link widoczny dla zalogowanych], the work suffered the maximum compression force of the spring over the spring in Figure 1,[link widoczny dla zalogowanych], maximum force 27000N. Shear stress 1 -= 8KADPo / where: K - coefficient of curvature, KA = 1; D - spring diameter, Shan, D = 100; d - spring wire diameter, mm, d = 25. Calculated = 870MPa> [. r] = 740MPa spring dimensions of the original work can not meet the requirements. 3 spring spring to improve the work obtained the maximum compressive force, according to the general method of calculating the size of the spring and work obtained parameters. Figure 3. (Process omitted) improved Figure 3 Figure 4 Conclusion spring spring parameters N properly, will affect the normal operation of crusher. Therefore, the spring should be considered in the design of the force factor, the correct choice structure size and operating parameters. Stress analysis of the rod through the spring to find out the main reason for spring break. This method can also be used for other types of crushers spring force analysis. References: [1] Lang Po Yin, Shi Lang Ping. Jaw crusher design and maintenance [M]. Machinery Industry Press, 1990. [2] Department of Harbin Institute of Technology ed. Theoretical Mechanics [M]. Higher Education Press, 1981. [3] New Mechanical Design Handbook [S]. Machinery Industry Press, 1994. (Continued from page 37) break needs. If the delay interval between rows is too short to make up the cast of rock blasting back shift, rather than moving horizontally, will produce fly rock, air blast and large. Practice has proved that, using scheduling is better than millisecond blasting hole or single-row blasting together and much better, it can not only improve the shape and width of the rock pile to reduce the bulk, but also improve the efficiency of mining shovel. Ranked from 1 to 5 Paibao hole can be reduced by an average of explosive rock fragmentation. Hole due to the increased number of rows, in order to achieve multi-stage initiation, which is favorable to improve the quality of measures for blasting. 1 Paibao hole in order to reduce the front of the large free surface produced by extrusion blow ballast to stay can get good results. In practice, the thickness of ballast generally stay 3 ~ 5m. This is done under the last burst only bucketing most of the rock pile, keep the top line to the next level of approximately 35m blasting of rock debris,[link widoczny dla zalogowanych], as a ballast to stay in the thickness of the next burst. In this way, the next burst in the 1st row by the blasting of ore and slag heaps of compression, so that large pieces of work have been further broken front part, to reduce the large purposes. 4 Conclusion (1) a more comprehensive introduction to this open hole blasting in the large rate of decrease of specific technical measures. (2) the rate of large deep hole blasting many factors should be identified for a specific mine may produce large rates of the main reasons, and then take the appropriate technical measures, can effectively reduce the bulk rate and improve the blasting quality. (3) In many of the mine production practice, to varying degrees, some mentioned in this article applied to reduce the large rate of technical measures, and achieved good blasting effect. (4) in the deep hole blasting, the increase in burst of energy efficiency, reduce the bulk rate,[link widoczny dla zalogowanych], and improve the quality of the work of blasting is endless, the production of the mine should continue to explore the practice and summary. References: [1] Tanzhuo Ying, Zhang Jianguo. Large deep hole blasting open rate and study the relationship between blasting parameters [J]. Blow, 1999, (4) :15-20. [2] Chen Shou such as Chen Ge, Xing Dongsheng. Deep level hard rock mining blasting comprehensive measures to reduce the large rate [J]. Non-ferrous metals (mining part), 2002, (2) :34-36. [3] Tao Songlin. Drilling and blasting [M]. Beijing, Metallurgical Industry Press, 1986. [4] Su Xueqing. Experimental Study of hole filling [J]. Blasting, 1994,11 (4) :38-40.
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