SSHJ3型卧式双轴桨叶饲料混合机关键技术研究

发布时间：2018-05-07 12:24

本文选题：饲料混合机 + 双轴桨叶式　；参考：《武汉轻工大学》2015年硕士论文

【摘要】：混合是饲料产品经计量配料后,将各种物料组分搅拌混合使之互相掺和均匀分布的一道工序。在现代配合饲料工作中,配料-混合系统,对饲料厂的生产效率和饲料产品的质量,起着决定性作用。目前市场上使用的卧式双轴桨叶式混合机尚存在如下几个问题:第一,混合机转子主要工作参数依靠经验数据,物料要达到规定的混合均匀度耗时较长。第二,混合机运行时因转子转动,产生正压力使得与混合室连通的配料秤精确度不高,回风管处产生粉尘物料外溢。第三,出料系统的控制机构结构复杂,两扇出料门启、闭不同步导致漏料严重,可靠性低,且控制程序操作不便。本文针对上述问题,完成了如下方面的研究工作。1.基于物料混合机理以及混合机工作质量指标要求,采用理论分析与现场实验相结合的方法,对30t/h SSHJ型卧式双轴桨叶式混合机的混合室及混合机转子主要工作参数进行优化设计,得到充满系数φ=0.65的混合室尺寸参数、最佳转子转速为25r/min,混合机桨叶安装角度α=32o,并设计完成SSHJ3型卧式双轴桨叶式混合机,有效缩短了达到规定混合均匀度的混合时间。2.根据压力平衡原理,设计混合工艺流程和回风管。在投料口处配置独立风机及脉冲除尘系统,消除混合机混合时产生的正压,避免对配料秤称重精度产生的影响及投料口粉尘物料从进料口外溢;设计连接机体式和独立式两种回风管以满足不同混合环境,有效地配合投料口脉冲除尘系统将混合室和外界连通,使气流通畅利于提高混合质量和效率且回风管处物料不外溢。3.基于机构组成原理,设计SSHJ3型卧式双轴混合机新型出料系统控制机构,实现单一气缸往复运动,机械控制两扇出料门的同步开启及关闭,简化了控制程序,提高了安全性。4.运用Pro/E构建新型出料系统控制机构骨架模型并进行运动仿真,结果显示:当气缸运行292.09mm时,双联摇杆转动91.37o,门体托臂联动摆杆转动为95.87o和96.52o,通过单一气缸实现了双门联动且满足卸料要求。5.采用有限元方法,对设计的新型出料系统控制机构和门体联动托臂的强度和刚度进行分析。当出料系统关闭时的最大变形为0.3683mm,最大应力28.188MPa。分析结果显示:出料系统及关键零部件满足强度和刚度要求,且不会从密封处漏料。
[Abstract]:Mixing is a process in which feed products are mixed with each other and evenly distributed. In the modern feed compounding work, the batch-mixing system plays a decisive role in the production efficiency of feed plant and the quality of feed products. At present, there are several problems in the horizontal two-shaft blade mixer: first, the main working parameters of the rotor of the mixer depend on the experience data, and it takes a long time for the material to achieve the specified mixing uniformity. Second, due to rotor rotation, the mixing machine produces positive pressure, which results in poor accuracy of the balance connected to the mixing chamber and dust spills at the return air pipe. Thirdly, the control mechanism of the discharge system is complex, the two discharge doors open, and the unsynchronously closed leads to serious leakage, low reliability and inconvenient operation of the control program. In order to solve the above problems, this paper has completed the following research work. 1. Based on the material mixing mechanism and the working quality requirements of the mixer, the main working parameters of the mixing chamber and rotor of the 30t/h SSHJ horizontal two-axis blade mixer are optimized by combining the theoretical analysis with the field experiment. The size parameters of mixing chamber with filling coefficient 蠁 0. 65 are obtained. The optimum rotor speed is 25 r / min. The installation angle of the blade of the mixer is 伪-32 o. and the SSHJ3 horizontal two shaft blade mixer is designed, which effectively shortens the mixing time to reach the specified mixing uniformity. According to the principle of pressure balance, the mixing process and return air pipe are designed. An independent fan and a pulse dust removal system are arranged at the feeding port to eliminate the positive pressure generated when the mixer is mixed, and to avoid the influence on the weighing accuracy of the weighing scale and the overflow of the dust material from the feeding port from the inlet; In order to meet different mixing environments, two kinds of return air pipes are designed to connect airframe type and independent type to meet the different mixing environment. The mixing chamber and the outside world are effectively connected with the pulse dust removal system of the feeding port, so that the airflow is smooth to improve the mixing quality and efficiency, and the material at the return duct is not spilt. 3. Based on the principle of mechanism composition, a new type of discharging system control mechanism of SSHJ3 horizontal two-axis mixer is designed, which realizes the reciprocating movement of single cylinder, and mechanically controls the synchronous opening and closing of two discharge doors. It simplifies the control program and improves the safety. The frame model of the control mechanism of the new discharging system is constructed by using Pro/E and the motion simulation is carried out. The results show that: when the cylinder is running 292.09mm, The rotation of double rocker rod is 91.37o. the rotation of door body supporting arm pendulum rod is 95.87o and 96.52o. the double door linkage is realized through a single cylinder and meets the discharge requirement .5. Using finite element method, the strength and stiffness of the control mechanism of the new discharge system and the door body linkage supporting arm are analyzed. When the discharge system is closed, the maximum deformation is 0.3683mm and the maximum stress is 28.188MPa. The analysis results show that the discharge system and key parts meet the requirements of strength and stiffness and do not leak from the seal.
【学位授予单位】：武汉轻工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S817.124

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