4BQD-40型氣力噴播機(jī)改進(jìn)設(shè)計與試驗研究.pdf

1、 分類號 S817.11 學(xué)校代碼 10129 U D C 621 學(xué) 號 2009205019 4BQD-40 型氣力噴播機(jī)改進(jìn)設(shè)計與試驗研究 Study on Improvement Design and Experiment for 4BQD-40 Pneum-seedin

2、g 申 請 人：張興華 學(xué)科門類：工 學(xué) 學(xué)科專業(yè)：機(jī)械設(shè)計及理論 研究方向：草物料加工機(jī)械裝備分析及仿真 指導(dǎo)教師：高 雄 副教授 論文提交日期：二〇一二年五月 Study on Improvement Design and Experiment for 4BQD-40 Pneum-seeding Abstract 4BQD-40 Pneum-seeding is a kind of machine that can spray

3、 the grass-seeds and shrubs-seeds in the ground by using high-speed airflow.This machine is mainly used for control sand and forestation, grassland construction in our desert and semi-desert region, and it has made a gre

4、at contribution for the improvement of grassland ecological environment. However, after years of application many problems appear in the homework process of machine, for instance, the serious replay, leakage sowing seed

5、s cause the uneven distribution phenomenon and have the bad effect on the sowing quality. For the above phenomenon in the homework process of 4BQD-40 Pneum-seeding, we improved the machine. The research contents and conc

6、lusion of this paper is as follows: 1. The feasibility study of changing the reciprocate switch of nozzle as motionless First on the base of pneumatic conveying principle and particle dynamics principle, we analyze the m

7、ovement trajectory of single seed respectively in the horizontal, vertical and inclined tube.With a single seed analysis as a precondition, we study the movement trajectory of seed group in the horizontal, vertical, incl

8、ined feed tubes and the maximum velocity of seed group in three kinds of seed tube.From three respects of the entire system pressure loss, the speed of seed-movement, seed width after the spray sowing seeds, we discuss t

9、he feasibility that reciprocating swing spray cylinder working condition will be changed to motionless. 2. The design of new nozzle In order to make the air flow can be evenly distributed throughout the cavity, we design

10、 linear guide plate and U guide plate in the new-designed nozzle, and change the exit of the nozzle from round to flat rectangular. 3.The design of transmission system After changed the tube working condition to motionl

11、ess, we need improve the complex transmission system of original machine. The improved transmission system is adopted the two-stage benchmark of narrow V belt, and it is suitable for the tractor with power output shaft o