Design and test of spring teeth chain rake type residual film reclaimer

doi:10.3969/j.issn.1004-1524.20221168

Acta Agriculturae Zhejiangensis ›› 2023, Vol. 35 ›› Issue (10): 2465-2476.DOI: 10.3969/j.issn.1004-1524.20221168

• Biosystems Engineering • Previous Articles Next Articles

Design and test of spring teeth chain rake type residual film reclaimer

WANG Haiji¹^,²(), WANG Min¹^,^*(), LU Yongtao¹, YING Yukun¹, WANG Jiliang¹, XUE Li¹, QIN Chaomin¹, HE Yuze¹

1. Mechanical Equipment Research Institute, Xinjiang Academy of Land Reclamation Sciences, Shihezi 832000, Xinjiang, China
2. College of Mechanical and Electrical Engineering, Shihezi University, Shihezi 832000, Xinjiang, China

Received:2022-08-11 Online:2023-10-25 Published:2023-10-31

Abstract

Abstract:

To reveal the influence of working parameters on the operation and performance of the spring teeth chain rake type residual film reclaimer, the three-dimensional discrete element model of the interaction between the spring teeth and the soil was established by EDEM 2019.1 software, and the changes of the forces during the working of the spring teeth was simulated. The reliability of the spring teeth during operation under the working conditions was verified. The spring teeth would not fail due to plastic deformation and could work smoothly. The trajectory of the spring teeth tip was ploted under different speed ratios via the software of Python 3, and the motion trajectory was obtained as cycloid. Based on the Box-Behnken experiment design method, mathematical models were established within the angular velocity of chain rake, the machine advance speed, the embedded depth of spring teeth, the recovery rate of residual film and the impurity rate, the operation parameters were optimized, and a field test was carried out. It was shown that the optimized operation parameters were as follows: the angular velocity of chain was 14.73 rad·s^-1, the machine advance speed was 9.7 km·h^-1, and the embedded depth of spring teeth was 74.7 mm. Under this working condition, the average recovery rate of residual film was 92.8%, and the impurity rate was 63.6% in the field test, which could meet the requirement of residual film reclaimer.

Key words: residual film recovery, chain rake device, response surface method

CLC Number:

S223.5

WANG Haiji, WANG Min, LU Yongtao, YING Yukun, WANG Jiliang, XUE Li, QIN Chaomin, HE Yuze. Design and test of spring teeth chain rake type residual film reclaimer[J]. Acta Agriculturae Zhejiangensis, 2023, 35(10): 2465-2476.

Figures/Tables 17

Fig.1 Special drawing of film mulching in cotton field 1, Cotton plant; 2, Membrane surface; 3, Membrane edge; a1, Width of the membrane edge, mm; a2, Width of membrane surface, mm; S1,Wide line spacing, mm; S2, Narrow line spacing, mm.

Table 1 Test results of mechanical properties

t/d	拉伸载荷 Tensile load/N	拉伸断裂标称应变 Nominal tensile strain at break/%
60	2.25±0.60	392±37
120	1.92±0.54	328±15

Fig.2 Structure of whole machine 1, Traction frame; 2, Main frame; 3, Packing front door; 4, Packing switch cylinder; 5, Main packing system; 6, Chain rake frame; 7, Spring teeth; 8, Wrap-up chain rake depth limit adjustment device.

Table 2 Main technical parameters

项目Item	参数Parameter
整机尺寸	6 440×2 600×2 800
Overall machine size/(mm×mm×mm)
作业幅宽Working width/mm	2 200
配备动力Equipped power/kW	≥88.3
生产率Productivity/(hm²·h^-1)	≥1.34
卸膜方式Film removal method	自动Automatic
运输间隙Transport gap/mm	280
残膜捡拾率Residual film recovery rate/%	≥87
含杂率Impurity rate/%	≤70

Fig.3 Drawing of spring teeth assembly 1, Spring tooth; 2, Elastic tooth shaft; 3, Mounted bearings.

Fig.4 Diagram of spring teeth layout (left) and spring tooth work scratches (right)

Fig.5 Trajectory of spring teeth (from point A to point B)

Fig.6 Force analysis of residual film

Fig.7 Trajectory of spring teeth tip a,λ<1;b,λ=1;c,λ>1。

Fig.8 Absolute motion trajectory of spring teeth 1, Motion trajectory of spring teeth tip; 2, Residual film surface; h, Depth of spring teeth into soil, mm; L0, Effective distance of filming, mm.

Fig.9 Scratch of spring teeth under different velocity Velocity in a, b, c is 6.49, 7.78, 11.2 km·h-1, respectively.

Fig.10 Trajectory of two adjacent rows of spring teeth

Fig.11 Soil particle model a, Block; b, Nucleated; c, Columnar.

Fig.12 Changes of force of spring teeth

Table 3 Test design and results

序号No.	X₁	X₂	X₃	J/%	Z/%
1	1	-1	0	94.34	66.28
2	1	1	0	87.56	56.36
3	0	1	-1	86.03	62.29
4	0	1	1	87.41	53.25
5	0	0	0	91.36	65.48
6	0	-1	-1	88.51	57.62
7	-1	0	-1	88.48	53.28
8	-1	1	0	84.62	51.32
9	0	0	0	93.95	61.74
10	0	0	0	94.62	66.26
11	0	0	0	90.85	59.57
12	-1	-1	0	87.23	54.22
13	-1	0	1	88.45	45.64
14	1	0	1	93.85	62.61
15	0	0	0	95.16	62.73
16	1	0	-1	86.29	72.81
17	0	-1	1	90.83	56.45

Fig.13 Response surface plot of the interactions of factors X1, Angular velocity of chain rake; X2, Machine advance speed; X3, Embedded depth of spring teeth; J, Recovery rate of residual film; Z, Impuriry rate.

Fig.14 Photo of test site

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Design and test of spring teeth chain rake type residual film reclaimer

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