【正文】 國內很多單位都對聯(lián)合收割機的脫粒分離裝置開展研究工作，并已取得很大成果。飽滿籽粒平均千粒重達 40 克，而不成熟籽粒的千粒重只有 20 克。Design 1 前言 研究現(xiàn)狀 脫粒裝置對作物脫粒過程的物理現(xiàn)象是比較復雜的，往往是幾種作用力同時作用，歸納起來，脫?？梢钥繘_擊、揉搓、梳刷、碾壓、振動等原理進行。 關鍵詞 ： 微型 ； 水稻；脫粒機；分離；設計 Design of the structure for Microricethresher Abstract:In order to meet the needs of the production of mountains rural rice threshing , the design of one kind of rice thresher for mountains is imminent. This paper designs the structure of a microrice –thresher,this kind of rice thresher can plete threshing, separation and screening operation. This machine has small volume, light weight, flexible operation, Passing ability and good adaptability to better solve the hills, mountains, and the problem of rice paddy harvest. The machine uses half feeding, bow roller gear threshers threshing, ensure threshing clean, broken rate is low, good separation performance. Key Words: The micro。 1前言 ............................................................... 1 研究現(xiàn)狀 ..........................................................2 研究意義 ..........................................................4 研究內容 ......................................................... 4 2脫粒機脫粒原理 ..................................................... 5 喂入方式 ......................................................... 5 脫粒原理 ......................................................... 5 沖擊原理 ....................................................... 5 梳刷原理 ....................................................... 6 揉搓或搓擦 ..................................................... 6 碾壓原理 ....................................................... 6 清選原理 ......................................................... 8 3總體方案確定 ....................................................... 8 初步設計方案 ..................................................... 8 功能分解 ......................................................... 9 結構及工作原理 .................................................. 10 基本結構 ...................................................... 10 工作原理 ...................................................... 11 傳動系統(tǒng) ...................................................... 11 4設計目標與主要技術參數(shù) ............................................ 12 4． 1主要技術參數(shù) ................................................... 12 設計目標 ...................................................... 12 脫粒滾筒及主要參數(shù)選擇 .......................................... 12 轉速 .......................................................... 12 滾筒直徑 ...................................................... 10 滾筒板齒 ...................................................... 13 滾筒脫粒段長度 ................................................ 11 凹版篩 .......................................................... 11 風機 ............................................................ 13 進料斗 .......................................................... 13 機架 ............................................................ 11 5主要零部件設計 .................................................... 11 電機選擇 ........................................................ 14 帶輪設計 ........................................................ 13 帶輪設計要求 .................................................. 13 帶輪材料 ...................................................... 13 帶輪設計計算 .................................................. 13 帶傳動設計 ...................................................... 13 脫粒軸 ......................................................... 16 計算各軸的最小直徑 ............................................ 16 軸的結構設計 .................................................. 17 滾動軸承選擇及校核 .............................................. 17 6風機與風選篩的設計 ................................................ 18 風量 Q 的計算 .................................................... 18 風扇尺寸計算 .................................................... 18 7鍵的選擇及校核 .................................................... 19 8總結 .............................................................. 19 參考文獻