真空带式泥浆筛筛网的力学分析

发布时间：2018-04-23 06:02

本文选题：真空带式泥浆筛 + 钢带叠层筛网　；参考：《长江大学》2017年硕士论文

【摘要】：针对新型环保要求提出的基于真空过滤理论的新型真空带式泥浆筛,不仅能实现固液分离,而且能够提高排出钻屑的干度,使得泥浆和钻屑能够最大程度的回收利用,方便运输,减少环境污染。但是其重要部件——钢带叠层筛网,较常规筛网具有更高的成本,其应用可能成为制约真空带式泥浆筛发展的关键。因此,在叠层筛网的相关参数及力学特性等方面展开研究,对提高使用寿命和指导筛网设计具有现实意义。本文首先对钻井泥浆的概念和无害化处理工艺进行总结,在此基础上对真空带式泥浆筛试验样机的总体方案进行对比设计,接着对真空带式泥浆筛的筛网传动部分进行方案确定,主要包括钢带叠层筛网传动方案设计、滚筒结构设计、张紧装置的结构设计、钢带叠层筛网的结构设计,为后面章节提供分析对象。其次,针对钢带叠层筛网的传动模型进行了简化,对其进行静力理论分析和满载工况下的载荷分析,计算了主动滚筒弯曲段任意包角处拉力值和拉应力值,绘制钢带叠层筛网的应力分布图;并对钢带叠层筛网的相关参数进行计算,其计算结果作为有限元分析的参数设置依据。最后借助Workbench仿真软件分析,求证理论分析的正确性。再次,基于RecurDyn软件建立钢带叠层筛网的有限元模型,对稳态运转的钢带叠层筛网在空载和满载两种工况下进行运动学分析和动力学分析;接着进行钢带叠层筛网应力影响因素分析,包括张紧力、转速、负载、滚筒直径以及钢带叠层筛网厚度等因素,为钢带叠层筛网的设计提供实际意义。最后,优化了张紧力与负载的关系,为钢带叠层筛网最小张紧力的设置提供理论依据。推导了五种开孔型式的开孔率计算公式,确定了70%开孔率的钢带开孔结构尺寸,并借助Workbench软件建模仿真分析,对钢带的不同开孔型式进行优化,评价优化结果,最终得出钢带最佳开孔方案。本文通过深入的研究了钢带叠层筛网的静力特性、运动和动力特性,其主要研究成果如下:(1)采用理论方法,求解了钢带叠层筛网传动的相关参数,分析了钢带叠层筛网应力的分布情况,同时利用Workbench有限元软件仿真,求证了理论静力分析的正确性。(2)在考虑钢带叠层筛网稳态运转的情况下,针对空载和满载两种工况对其进行运动学和动力学仿真分析,得出了滚筒角速度、滚筒角加速度、带元速度等运动参数,也得出了带元张力分布、带元接触力分布等力学参数。同时,对滚筒直径、转速、负载、筛网厚度等因素进行影响分析。(3)对张紧力与负载的关系进行了优化,拟合出了关系表达式,在已知负载的条件下,为钢带叠层筛网最小张紧力的设置提供理论依据。同时,对70%开孔率时钢带开孔孔型的优选,确定了矩形开孔型式为本次钢带开孔的结构优化的最佳方案。本文的研究成果,有利于进一步对钻井泥浆处理设备的探索与创新,也为钢带叠层筛网的设计和应用提供理论和指导意义。
[Abstract]:A new type of vacuum belt slurry sieve based on the theory of vacuum filtration is proposed to meet the requirements of new environmental protection. It can not only achieve solid liquid separation, but also improve the dryness of the drilling cuttings, so that the mud and drilling chips can be recycled to the maximum extent and facilitate transportation and reduce environmental pollution. But the important component of the steel belt laminated sieve is more conventional. The screen network has a higher cost and its application may be the key to the development of the vacuum belt slurry screen. Therefore, it is of practical significance to improve the service life and guide the screen design in the aspects of the related parameters and mechanical properties of the laminated sieve. This paper first summarizes the concept of drilling mud and the harmless treatment process. On this basis, the overall scheme of the vacuum belt slurry sieve test prototype is designed and compared. Then the screen transmission part of the vacuum belt slurry sieve is determined. It mainly includes the design of the steel belt laminated screen transmission, the design of the drum structure, the structural design of the tensioning device, the structure design of the steel belt laminated screen, and the latter chapter. Secondly, the transmission model of the steel belt laminated sieve is simplified, the static theory analysis and the load analysis under full load condition are carried out. The tensile and tensile stress values at the arbitrary angle of the active drum bend section are calculated, and the stress distribution diagram of the steel belt laminated screen is drawn, and the related parameters of the steel belt laminated sieve mesh are also drawn. The calculation results are calculated as the basis for the parameter setting of the finite element analysis. Finally, the correctness of the theoretical analysis is proved by the Workbench simulation software. Thirdly, based on the RecurDyn software, the finite element model of the steel strip laminated sieve is set up, and the steel strip screen mesh of the steady operation is carried out in two operating conditions under the load of empty and full load. Analysis and dynamic analysis, and then the analysis of the influence factors of the stress of the steel belt laminated screen, including tension, speed, load, diameter of the roller and the thickness of the steel strip screen mesh, provide practical significance for the design of the steel belt laminated screen. Finally, the relationship between the tension force and the load is optimized and the minimum tension of the steel belt laminated screen is set up. Theoretical basis is provided. The formula of opening rate of five types of openings is deduced, the opening structure size of steel strip with 70% opening rate is determined, and the simulation analysis of Workbench software is used to optimize the different openings of steel strip, evaluate the optimization results, and finally get the best opening scheme for steel strip. This paper studies the steel through in-depth study of steel The static characteristics, motion and dynamic characteristics of the laminated sieve mesh are as follows: (1) using the theoretical method, the relevant parameters of the steel strip laminated screen transmission are solved, and the distribution of the stress of the steel strip laminated screen is analyzed. At the same time, the correctness of the theoretical static analysis is proved by the Workbench finite element software simulation. (2) considering the steel In the condition of steady operation of the laminated sieve, the kinematic and dynamic simulation analysis is carried out for two operating conditions of empty and full load. The angular velocity of the drum, the angular acceleration of the drum, the velocity of the belt and other motion parameters are obtained, and the mechanical parameters such as the tension distribution of the belt and the distribution of the contact force of the belt are obtained, and the diameter of the drum, the speed, the load and the screen are also obtained. The influence of net thickness and other factors is analyzed. (3) the relationship between tension and load is optimized, and the relationship expression is fitted. Under the condition of the known load, it provides the theoretical basis for the minimum tensioning of the steel belt laminated screen. At the same time, the rectangular opening type is determined to be the present steel with the optimum selection of the opening hole of the steel strip at the 70% opening rate. The research results of this paper are beneficial to the exploration and innovation of drilling mud treatment equipment, and provide theoretical and guiding significance for the design and application of the steel belt laminated screen.

【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE927

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