工业大麻收割机切割⁃输送关键部件作业参数优化

doi:10.13229/j.cnki.jdxbgxb20191177

Abstract

Abstract:

In order to improve the cutting efficiency and conveyor rate of hemp harvester， the central composite design experiments were conducted to optimize the working parameters. Firstly， the physical and mechanical properties of hemp stem were studied. Based on composite experiment methods of quadratic orthogonal rotation， the effects of key components' main working parameters， including cutting speed， chain conveyor speed， horizontal distance between cutting and clamping point， on cutting efficiency and convey rate were analyzed. The data were analyzed based on the Design-Expert software. The regression models of cutting efficiency and convey rate were built， and corresponding variance analysis was conducted. The response surface method was utilized to analyze the effects of factors' interaction on the cutting efficiency and conveyor rate， and the multi-objective optimizations were conducted to determine the working parameters for the best cutting efficiency and conveyor rate. The optimal combination of the working parameters of the hemp harvester are the cutting speed of 1.33 m/s， the chain conveyor speed of 1.35 m/s， and the horizontal distance between cutting and clamping point of 63.9 mm. Under this optimal combination， the cutting efficiency and conveyor rate are 44.35 stalks/s and 93.93%， respectively. The field verification test was conducted. With the optimal parameters， and the cutting efficiency and conveyor rate are 44.7 stalks/s and 92.21%， respectively， closing to the model predicted results and greatly improving the harvester performance. The study provides the scientific basis for key components' working parameters optimization of hemp harvester.

Key words: agricultural machinery, hemp, harvester, multi-objective optimization, response surface methodology

CLC Number:

S225.5

Ji-cheng HUANG,Cheng SHEN,Ai-min JI,Xian-wang LI,Bin ZHANG,Kun-peng TIAN,Hao-lu LIU. Optimization of cutting⁃conveying key working parameters of hemp harvester[J].Journal of Jilin University(Engineering and Technology Edition), 2021, 51(2): 772-780.

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参数	数值
外形尺寸（长×宽×高）/(mm×mm×mm)	3400×2100×2300
底盘动力/kW	74.5
割幅/mm	1 600
割茬高度/mm	≤100
作业速度/(m·s^-1)	0.45~1.0
生产率/(hm²·h^-1)	0.25~0.4

因素	试验水平
因素	-1	0	1
切割速度A/(m·s^-1)	1.0	1.2	1.4
链条输送速度B/(m·s^-1)	0.9	1.2	1.5
切割与夹持点水平距离C/mm	30	60	90

方差来源	切割效率Y₁/（株·s^-1）				输送率Y₂/%
方差来源	平方和	自由度df	F值	显著水平P	平方和	自由度df	F值	显著水平P
模型	361.08	9	17.07	0.000 6**	526.51	9	47.82	0.000 1**
A	231.13	1	98.35	<0.000 1**	4.47	1	3.65	0.097 5
B	18.00	1	7.66	0.027 8*	146.21	1	119.51	<0.000 1**
C	3.13	1	1.33	0.286 7	15.07	1	12.32	0.009 9**
AB	9.00	1	3.83	0.091 2	0.27	1	0.22	0.652 6
AC	6.25	1	2.66	0.146 9	1.56	1	1.28	0.295 7
BC	4.00	1	1.70	0.233 3	11.42	1	9.34	0.018 4*
A²	88.13	1	37.50	0.000 5**	0.27	1	0.22	0.655 0
B²	0.44	1	0.19	0.676 6	228.30	1	186.62	<0.000 1**
C²	0.76	1	0.32	0.587 2	101.45	1	82.92	<0.000 1**
残差	16.45	7			8.56	7
失拟项	9.25	3	1.71	0.301 5	4.96	3	1.84	0.280 6
误差	7.20	4			3.60	4
总和	377.53	16			535.08	16

Optimization of cutting⁃conveying key working parameters of hemp harvester

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