Research And Design Of Bridge Type Large Span Dual Bucket Wheel Blending Reclaimer

In the recent years, the blending system of material pile is wildly used in the industries of the cement, steel and others. As indispensible part to raw material handling equipment, this blending system mainly includes stacker, reclaimer and auxiliary devices.Along with the national economic construction vigorous development, the capacity of materials yard becomes more and more, aiming at this requirement, the storage capacity must be increased. In order to increase the storage material, the materials yard must be developed toward the length, the width or height, etc. Development to the length direction is only a degree of freedom increment and normally limited by the terrain and investment; But development to the width direction may simultaneously increase the height and realize in two degrees of freedom increment. Looking from the performance-to-price ratio, the present blending system many mainly develops to the width direction, therefore, as a part of blending system of material pile, to study on bridge type dual bucket wheel is extremely significant.The bucket wheel stacker reclaimer is a kind of large-scale buck material transporting machine and is widely used in port, electricity, coal mine and metallurgy. As a large-scale steel structure, not only the stiffness designs and strength designs have to be considered, but also the static and dynamic balance stability, which is more important and is the first things to be considered. The choice of parameters both must consider the safety and the efficiency of equipment, as well as the most superior performance-to-price ratio.The paper in view of client' s demand develops the QQL900.43 bridge type reclaimer with span of 43 meters, and realizes the double advance intechnology and the benefit of this kind of product in domestic market.The Capcity and specification of the reclaimer are quite different fromthe fomer one that with 30m span, thus, deep study, new design and calculation must by done to optimize the machine.The paper, based on the design of the general arrange of bridge type reclaimer, optimizes the main structure, such as traveling unit, rolling unit, trolley traveling unit and raking unit.According to the function and design criterion of traveling unit, the driving mode is of with parallel axis gearing box; According to the function and design criterion of rolling wheel, the driving mode is of with chain; According to the function and design criterion of trolley, the driving mode is of with wire rope; According to the structure, function and design criterion of racking unit, make calculation on pulling force and safe indexof wire rope, torque and power of hoist.The structure of the reclaimer is analyzed and optimized with the finiteelement analysis software. Based on the intensity examination, the rigidity examination and the stable examination to structure, it indicates that intensity, the rigidity and the stability of structure satisfy requirement, and greatly raises usage of the material. Through carrying on the modality analysis on the structure, it indicates all rotation parts cannot cause main body structure resonating.According to the load and operating mode of the structure, the reasonable computation model is established to obtain displacement and the stress value of the various key points, as well as the various models of the complete machine under the dead weight operating mode and the normal work condition. Looking from the computed result, the biggest displacement of main beam occurs in the operating mode 3, according to biggest distortion, during fabrication, cancels the distortion through the pre-arch to satisfy stability of trolley. The he biggest max stress of the metal structure (including main beam, material rake, left end girder and, right end girder) is smaller than the allowable stress. The structural design is reasonable and satisfy the operation requirements completely.The design of QQL900.43 dual bucket-wheel bridge type reclaimer in the paper is reasonable and each index conforms to the user' s requirements. The reclaimer has been accepted by Shaoguan Songshan Steel Co; Ltd and has certain guiding sense to the domestic similar product design. Along with the vigorous development of the domestic and international construction, especially the iron and steel plant extension, different reconstruction and new building, the massive ore will be mixed. All this opens big market for the reclaimer. More and more all kinds of reclaimers will be put in the market.