覆草冬种马铃薯收获机稻草分离机构设计与试验

doi:10.13229/j.cnki.jdxbgxb20181022

Abstract

Abstract:

To increase the soil temperature to ensure that the production of potato, the straw was used to cover the soil when planting potato in the south of China in winter. When the straw-covered winter potato is harvested, there exist several problems such as big digging resistance, easy blocking, difficult separation of straw, and low excavation rate and high injury rate of potato. In order to solve these problems, a harvester for winter planting potato with a straw separation device is developed. The harvester is composed of divided shovel, rod elevating chain, straw separating mechanism and oscillating screen which can finish potato digging, separate potato from soil and straws , orderly placement of potato in one step. This article described the main structure and working principle of the machine. In addition , according to theorem of vector projection, kinetic energy and kinematics, the structure of key parts were designed and the parameters were determined. To evaluate the performance of the harvester, field experiment was carried out, in which the obvious rate of potato, injury rate of potato and reliability were taken as the indexes and the machine forward speed, tilt angle of sieve plate and number of lifting lever were taken as the factors. The multi-objective optimization method was adopted to analyze the experimental data. The results show that when the machine forward speed was 0.4 m?s ^-1, working finger speed was 3 m?s ^-1, and the number of working pole was 6, the obvious rate of potato was 99.5%, injury rate of potato was 4.2%, the reliability was 80.4%. The comprehensive performance index was better and meet the using requirements of potato harvester.

Key words: agricultural machinery engineering, harvesting equipment, potato, straw, multi-objective optimization

CLC Number:

S224.1

Xue-shen CHEN,Tao CHEN,Tao WU,Xu MA,Ling-chao ZENG,Lin-tao CHEN. Design and experiment on harvester for winter planting potato of straw coverage[J].Journal of Jilin University(Engineering and Technology Edition), 2020, 50(2): 749-757.

Figures/Tables 13

Fig.1

Fig.2

Table 1

Main technical parameters of harvester for winter planting potato with straw coverage"

参数	设计数值
外形尺寸/（ $m m × m m × m m$ ）	2920×1500×1270
整机质量/kg	528
配套动力/kW	≥29.8
作业幅度/ $m m$	1 000
挖掘深度（可调）/mm	150~300
工作生产效率/ $(h m 2 · h - 1)$	0.2~0.3
栅板倾角/(°)	12
拨指速度（可调）/ $(m · s - 1)$	2~6
拨杆数量（可调）/根	4~8

Table 1

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Table 2

Factors and levels of test"

水平	作业速度 A/ $(m · s - 1)$	拨指速度 B/ $(m · s - 1)$	拨杆数量C/根
1	0.6	2	4
2	0.8	3	6
3	1.0	4	8

Table 2

Table 3

Results of orthogonal experiment"

试验号	作业速度 A/（ $m · s - 1$ ）	拨指速度 B/（ $m · s - 1$ ）	拨杆数量 C/根	明薯率 X/%	伤薯率 Y/%	薯草分离率 Z/%	综合加权评分
1	1（0.6）	1(2)	1(4)	97.2	2.1	67.3	0.71
2	1	2(3)	2(6)	99.5	4.2	80.4	0.85
3	1	3(4)	3(8)	96.7	5.7	83.7	0.71
4	2(0.8)	1	2	95.5	4.4	78.6	0.67
5	2	2	3	96.9	6.7	82.2	0.64
6	2	3	1	93.6	3.8	70.4	0.53
7	3(1.0)	1	3	91.8	8.4	72.8	0.25
8	3	2	1	92.3	5.2	56.7	0.24
9	3	3	2	90.5	5.5	71.1	0.33

Table 3

Table 4

Table 5

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分析项	明薯率 X/%			伤薯率 Y/%			薯草分离率 Z/%
分析项	作业速度 A	拨指速度 B	拨杆数量 C	作业速度 A	拨指速度 B	拨杆数量 C	作业速度 A	拨指速度 B	拨杆数量 C
主次因素	ABC			CAB			CAB
k₁	97.80	94.83	94.37	4.00	4.97	3.70	77.13	72.90	64.80
k₂	95.33	96.23	95.17	4.97	5.37	4.70	77.07	73.10	76.70
k₃	91.53	93.60	95.13	6.37	5.00	6.97	66.87	75.07	79.57
R	6.27	2.63	0.80	2.37	0.40	3.27	10.26	2.17	14.77

变异来源	3类方差	自由度	平均偏差平和	F值	显著性 P
校正模型	0.398 ^a	6	0.066	192.516	0.005
截距	2.701	1	2.701	7 840.290	0.000
A	0.370	2	0.185	536.742	0.002
B	0.004	2	0.002	6.323	0.137
C	0.024	2	0.012	34.484	0.028
Error	0.001	2	0.000
Total	3.099	9
Corrected Total	0.399	8

Design and experiment on harvester for winter planting potato of straw coverage

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