Design and experiment of swing intra-row weeding device for paddy field

doi:10.3969/j.issn.1004-1524.2022.08.21

Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (8): 1772-1783.DOI: 10.3969/j.issn.1004-1524.2022.08.21

• Biosystems Engineening • Previous Articles Next Articles

Design and experiment of swing intra-row weeding device for paddy field

TIAN Liang¹(), CAO Chengmao¹^,²^,^*(), QIN Kuan¹^,², GE Jun¹^,², FANG Liangfei¹

1. School of Engineering, Anhui Agricultural University, Hefei 230036, China
2. Scientific Observing and Experimental Station of Agricultural Equipment for the Southern China, Ministry of Agriculture and Rural Affairs, Hefei 230036, China

Received:2021-12-16 Online:2022-08-25 Published:2022-08-26
Contact: CAO Chengmao

Abstract

Abstract:

Aiming at the problems of high seedling damage rate and low weeding rate of intra-row weeding device in paddy field, a swing intra-row weeding device for paddy field was designed. The overall structure and working principle of weeding device were illustrated and analyzed. Theoretical analysis and structural design of eccentric mechanism and weeding spring tine were carried out. Combined with the reciprocating opening and closing movement of spring tine and rice planting agronomy, the movement process of weeding spring tine and the working mechanism of seedling avoidance system were analyzed. Based on ADAMS software, by taking the machine driving speed and eccentric rotational speed as test factors, coverage rate and intrusion rate as evaluation indexes, the virtual simulation test was carried out via two factor five level quadratic regression orthogonal rotation combination method. The simulation results revealed that the machine driving speed and eccentric rotation speed had significant (P<0.01) impact on the coverage rate and intrusion rate, and the machine driving speed was the main factor affecting the working performance of the weeding device. When the machine driving speed was 266.12 mm·s^-1 and the eccentric rotational speed was 3.97 r·s^-1, the coverage rate was 85.70% and the intrusion rate was 5.62% in simulation. The field test results revealed that when the machine driving speed was 270 mm·s^-1 and the eccentric rotational speed was 4 r·s^-1, the weeding rate of the weeding device was 82.5% and the injury rate was 5.1%, which was roughly consistent with the simulation results. Thus, the designed weeding device could meet the requirement of weeding agronomy in paddy field.

Key words: paddy field, swing type, avoiding seedlings, intra-row weeding

CLC Number:

S224.15

TIAN Liang, CAO Chengmao, QIN Kuan, GE Jun, FANG Liangfei. Design and experiment of swing intra-row weeding device for paddy field[J]. Acta Agriculturae Zhejiangensis, 2022, 34(8): 1772-1783.

Figures/Tables 11

Fig.1 Schematic diagram of swing intra-row weeding device for paddy field 1, Frame; 2, Connecting rod; 3, Eccentric; 4, Main shaft; 5, Sensor mounting frame; 6, Laser sensor; 7, Push rod; 8, Connecting block; 9, Swinging rod; 10, Bottom plate; 11, Weeding rod; 12, Weeding spring tine.

Fig.2 Schematic diagram of movement trajectory of weeding device 1, Trajectory of weeding spring tine; 2, Crop protection area; L, Intra-row space of rice, mm; ABCD, Trajectory of spring tine in avoidance stage; A1B1C1D1, Trajectory of spring tine in avoidance stage of the next weeding period; L0, Range of crop protection area, mm; L1, Device driving distance in push stage, mm; L2, Device driving distance in remote standstill stage, mm; L3, Device driving distance in return stage, mm; L4, Device driving distance in proximity standstill stage, mm; v0, Device driving speed, mm·s-1.

Fig.3 Structure diagram of eccentric mechanism 1, Distance between weeding rods, mm; 2, Swinging rod; 3, Push rod; 4, Connecting rod; 5, Eccentric; l, Length of swinging rod, mm; h, Vertical length of swinging rod when weeding spring tine disc is closed, mm; s, Horizontal length of swinging rod when weeding spring tine disc is closed, mm; e, Offset radius of eccentric, mm; l0, Length of connecting rod, mm. Solid line parts, Position of eccentric mechanism in initial state; Broken line parts, Position of eccentric mechanism in remote standstill stage.

Fig.4 Schematic diagram of laser sensor installation position 1, Crop protection area; 2, Weeding spring tine; 3, Rice seedling; 4, Laser sensor; L5, Mounting distance between weeding spring tine and laser sensor, mm.

Fig.5 Schematic diagram of weeding in intra-row area 1, Crop protection area; 2, Overlapping part of weeding spring tine coverage area and crop protection area; 3, Coverage area of weeding spring tine; 4, Uncovered area of weeding spring tine.

Fig.6 Schematic diagram of weeding spring tine movement trajectory a, Schematic diagram of simulation; b, Schematic diagram of trajectory of weeding spring tine. 1, Trajectory of left weeding spring tine; 2, Trajectory of right weeding spring tine.

Table 1 Coding table of experimental factors and levels

水平编码 Level code	X₁:机具前进速度 Machine driving speed/ (mm·s^-1)	X₂:偏心轮转速 Eccentric rotation speed/ (r·s^-1)
1.414	400.00	6.00
1	370.71	5.56
0	300.00	4.50
-1	229.29	3.44
-1.414	200.00	3.00

Table 2 Experimental design and results

序号 No.	试验因素水平编码 Level code of experiment factors		评价结果 Evaluation result
序号 No.	X₁	X₂	Y₁/%	Y₂/%
1	1	1	85.84	5.89
2	1	-1	88.59	8.63
3	-1	1	81.59	3.40
4	-1	-1	85.51	5.51
5	1.414	0	87.96	8.30
6	-1.414	0	82.30	3.67
7	0	1.414	83.18	4.53
8	0	-1.414	88.16	7.90
9	0	0	85.83	5.79
10	0	0	85.74	5.68
11	0	0	85.55	5.53
12	0	0	85.68	5.64
13	0	0	85.73	5.67
14	0	0	86.32	6.15
15	0	0	86.06	5.97
16	0	0	85.38	5.34

Fig.7 Analysis of response surface X1, Machine driving speed; X2, Eccentric rotation speed; Y1, Coverage rate; Y2, Intrusion rate.

Fig.8 Photos of field experiment of weeding device a, Paddy field before weeding; b, Paddy field after weeding.

Table 3 Field experiment results %

试验号 Test No.	除草率 Weeding rate	伤苗率 Injury rate
1	82.3	5.5
2	82.8	4.6
3	81.6	5.2
4	83.4	5.7
5	82.4	4.5
平均值Average	82.5	5.1

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Design and experiment of swing intra-row weeding device for paddy field

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