| The research of new-type and high-efficiency gravity concentrating equipment is one of the difficulties of mineral processing industry all the way. With the lack of mineral resources and the requirement of environment protection from the 1980's, people realize the advantages of gravity concentration again, because the gravity concentration has the characters of low energy consumption, no pollution and large handling capacity, etc.. So far, Yunnan Tin Company has stored 160 million tons tin tailings. Because of the lack of tin resources, the comprehensive utilization of tin tailings has became the important way to develop the tin enterprise like Yunnan Tin Company. In order to utilize the tin tailings well, the first thing is to develop and design new-type and high-efficiency equipment that can handle the tin tailings, it also the main subject of my thesis as well.In recent years, the research of multi-force field gravity concentrating equipment and micro-fine particle gravity concentration has became the hot spot of gravity concentration. The tendencies of gravity concentrating equipment are as follows:the interrupted operation has been transferred to continuous operation; the single gravity force field has been transferred to multi-force field; (3) the manual operation has been transferred to automatic-controlled operation;(4)small-scale equipment has been transferred to large-scale one.After we studied and analyzed the present gravity concentrating equipment, we put forward a creative thought of "large quantity roughing-small quantity cleaning" according to the character of the tin tailings of Yunnan Tin Company. On the basis of the present Rotary-Vibrating Tower Separator (RVTS), we put forward the new design plan of industrial prototype of RVTS, the design requirements are as follows:the motion of the separating disk (d=2.5m) is translation, the radius of the motion circle is 3-6mm, and the motion frequency is 3-8 Hz, which was called the main motion; the separating disk is also forced to do rotary motion round the axle, the velocity of the rotary motion is 0.3-1.5 rpm, we called it auxiliary motion;the six or more disks ' are located parallelly up and down, and the distance of every two disks iswithin 150 mm;the kinematic parameter of the prototype should be adjusted conveniently, etc..According to the requirement of mineral processing, we think the design of the main motion is more important than others. Compared with other similar equipment, the moving mechanism, mode of motion and the material of the disk are creative, we put forward two design plans of the main motion, one is parallel double-crank mechanism, the other is sine mechanism. In view of the advantages and disadvantages of the two motion mechanisms for the industrial prototype, we adopt the sine motion as its main motion. In order to adjust the parameter conveniently, the driving systems of the main motion are independently, and their velocities are controlled by two different transducers.The whole design plan of the industrial prototype was stated hi details in this thesis. From \he angle of engineering tribology, the steel ball-spring carrying mechanism was discussed in details, because this mechanism is the characteristic part of the prototype. Because of the complexity offeree that the steel ball-spring mechanism (SSM) bore, we tested the variation of the power consumption of SSM when the load varied. We can draw a conclusion from the testing results, the power consumption is varied slightly when the load of the SSM is varied, and we can also draw another conclusion that the spring can be canceled in the next design.After the good installation, debugging and operation, we can see that: the structure of the equipment is reasonable, and the motion stabilization is liable, which can meet the requirement of mineral processing. From the experimental research on the tin tailings of Yunnan Tin Company using the industrial prototype, we can draw the conclusions are as follows: the good experimental results of tin tailings could b... |
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