秸秆压块机辊口式环模耐磨机理分析与试验  

Wear-resisting Mechanism Analysis and Experiment on Circular Mould of Straw Briquetting Machine by Rolling Entrance Structure

作　　者：仇平[1] 李兴兴[1] 赵铁石[1] 刘石双 

机构地区：[1]燕山大学机械工程学院,秦皇岛066004

出　　处：《农业机械学报》2016年第3期112-116,105,共6页Transactions of the Chinese Society for Agricultural Machinery

基　　金：河北省科学技术研究与发展计划科技支撑计划项目(14227211D)

摘　　要：环模秸秆压块机成型过程中,由于秸秆颗粒与环模之间的滑动摩擦,环模模孔磨损十分严重,导致环模使用寿命缩短。以工字型模块组成的立式环模为研究对象,提出在工字型模块喂料端设置辊口式结构,即在工字型腰部上下两翼加工圆孔,孔中装配轴承和插入圆辊。通过相邻圆辊间所构成的辊口压入秸秆颗粒,从而将物料与原模块间因数较大的滑动摩擦变为物料与圆辊间因数较小的滚动摩擦,达到减小模孔磨损的目的。利用有限元软件分析得到改进前和改进后模孔处的磨损率曲线,结果表明:改进前环模最大磨损率0.11μm/s,改进后辊口式环模最大磨损率0.01μm/s,远小于改进前磨损率。通过试验表明所设计的辊口式环模具有减小磨损和延长环模寿命的作用。In the course of circular mould straw briquetting,the entrance of the circular mould is worn very serious due to sliding friction between straw pellet and the circular mould. With a vertical circular mould consisted of H module as the research object,this paper put forward a rolling entrance structure which is made of bearings and roller,and the structure is stationary fitted in round holes of two wings up and down at the waist position of H module closed the feed side. When straw pellet was pressured into the mould hole between adjacent rollers,rolling friction coefficient between rollers and straw pellet was reduced smaller than sliding friction coefficient between the original mould and straw pellet,the purpose of weakening the module wear was achieved. At first,wear rule of the original circular mould before improvement was analyzed by the FEM. The geometric model of the original circular mould consisted of H modules was established in accordance with 9JY2000 straw briquetting machine of a factory,high and wide of the mould hole are 33 mm × 32 mm. Under conditions that elasticity modulus of straw was8. 1 GPa,plastic relation of straw was Euler stress and Almansi strain,sliding friction coefficient between the circular mould and straw was 0. 4,hardness of the circular mould was HRC55,rotation speed of pressure rollers was 30 r / min,temperature was room temperature,straw briquetting was simulated by means of the Archard wear model. The result showed that normal pressure at the front edge of the H module waist was larger,45 MPa,and wear rates of this edge was 0. 11 μm / s. The second,wear rule of the circular mould of rolling entrance structure after improvement was analyzed by the FEM. Under conditions that diameter of the roller was Φ35 mm,friction coefficient between the roller and bearing bushwas 0. 01,the model of the circular mould of rolling entrance structure was established and simulated by the FEM. The result showed that rollers laid a single direction intermittent rotation,the maximum angular velo

关 键 词：秸秆压块机 立式环模 辊口结构 耐磨 

分 类 号：S216.2[农业科学—农业机械化工程]