Design and experiment of double layer flat screen type Pinellia ternate harvester

doi:10.3969/j.issn.1004-1524.2021.10.19

Acta Agriculturae Zhejiangensis ›› 2021, Vol. 33 ›› Issue (10): 1946-1955.DOI: 10.3969/j.issn.1004-1524.2021.10.19

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Design and experiment of double layer flat screen type Pinellia ternate harvester

WANG Feng¹(), ZHANG Fengwei¹, DAI Fei¹, ZHANG Luhai², ZHAO Wei³, YANG Xiaoping¹^,^*()

1. Mechanical and Electrical Engineering College, Gansu Agricultural University, Lanzhou 730070, China
2. Gansu Agricultural Mechanization Technology Extension Station, Lanzhou 730070, China
3. Dingxi Sanniu Agricultural Machinery Manufacturing Co., Ltd., Dingxi 743022, China

Received:2021-03-02 Online:2021-10-25 Published:2021-11-02
Contact: YANG Xiaoping

Abstract

Abstract:

The artificial harvest of Pinellia ternata in hilly and mountainous areas has problems of high labor intensity, low efficiency, long harvest period, high harvest loss rate, etc. Meanwhile, the application of current harvester also has shortcomings of incomplete harvest, poor separation effect, large workload of secondary impurity removal and so on. To overcome these problems, a Pinellia ternata harvester was designed. The prototype is mainly composed of digging device, lifting device, screening device and collection device. Analytical method is used to analyze and determine the lifting speed of the lifting device, hence determine the lifting capacity and power.The conditions of vertical and horizontal movement of Pinellia ternata and soil complex is analyzed, and the eccentric wheel speed is determined in the range of 530-753 r·min ^-1, along with the eccentric distance range of 15-25 mm.By analyzing the motion characteristics of Pinellia ternata from the lifting device to the sieve surface, the height of the top of the lifting device to the sieve surface is determined as 350 mm. EDEM software is used to simulate the screening process to verify the rationality of parameter selection. The simulation results show that when the frequency of the flat screen is 9 Hz and the amplitude is 20 mm, the distribution of the complex particles on the sieve surface is uniform.The complex particles can complete the backward movement, forward movement and throwing movement, without siltation and other screening obstructions.The periodicity of the complex particles and the difference of the total velocity in the vertical direction are obvious, indicating that the design of the screening device with selected parameters are reasonable. The field test of the prototype of Pinellia ternata harvest shows that when the speed is 0.5 m·s ^-1, the digging depth is 83 mm, and the output speed of the tractor is 540 r·min^-1, the net excavation ratio is 97.3%, the damage rate is 3.51%, and the impurity content is 4.97%. The test indexes all meet the technical requirements of quality evaluation and prototype design requirements. This study can provide application examples and technical references for the design and development of Pinellia ternata harvester.

Key words: Pinellia ternate, lifting device, screening device, discrete element method, numerical simulation

CLC Number:

S225.7⁺9

WANG Feng, ZHANG Fengwei, DAI Fei, ZHANG Luhai, ZHAO Wei, YANG Xiaoping. Design and experiment of double layer flat screen type Pinellia ternate harvester[J]. Acta Agriculturae Zhejiangensis, 2021, 33(10): 1946-1955.

Figures/Tables 11

References 24

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指标Index	参数Parameter
挂接方式 Connection mode	牵引式 Traction type
外形尺寸(长×宽×高)Dimensions(Length×width×height)/(mm×mm×mm)	3 680×1 300×1 325
整机质量Overall quality/kg	980
作业速度Operation speed/(km·h^-1)	1.32~2.88
作业幅宽Working width/mm	1 100
配套动力范围Auxiliary power range/kW	50~75
挖掘深度Excavation depth/mm	70~120
挖掘铲型式 Excavator type	平面整体式 Plane integral type

指标Index	参数Parameter
挂接方式 Connection mode	牵引式 Traction type
外形尺寸(长×宽×高)Dimensions(Length×width×height)/(mm×mm×mm)	3 680×1 300×1 325
整机质量Overall quality/kg	980
作业速度Operation speed/(km·h^-1)	1.32~2.88
作业幅宽Working width/mm	1 100
配套动力范围Auxiliary power range/kW	50~75
挖掘深度Excavation depth/mm	70~120
挖掘铲型式 Excavator type	平面整体式 Plane integral type

对象Object	参数Parameter	数值Numerical value
土壤Soil	泊松比Poisson's ratio	0.3
	密度Density/(kg·m^-3)	2 600
	剪切模量Shear modulus/P_a	5.0×10⁷
半夏Pinellia ternata	泊松比Poisson's ratio	0.3
	密度Density/(kg·m^-3)	1 012.68
	剪切模量Shear modulus/P_a	1.366×10⁷
筛网Screen mesh	泊松比Poisson's ratio	0.3
	密度Density/(kg·m^-3)	7 865
	剪切模量Shear modulus/P_a	7.9×10¹⁰
土壤与土壤Soil and soil	恢复系数Coefficient of restitution	0.2
	静摩擦因数Static friction factor	0.4
	动摩擦因数Dynamic friction factor	0.3
土壤与半夏Soil and Pinellia ternate	恢复系数Coefficient of restitution	0.06
	静摩擦因数Static friction factor	0.50
	动摩擦因数Dynamic friction factor	0.01
半夏与半夏Pinellia ternata and Pinellia ternata	恢复系数Coefficient of restitution	0.790
	静摩擦因数Static friction factor	0.452
	动摩擦因数Dynamic friction factor	0.024
土壤与筛网Soil and screen mesh	恢复系数Coefficient of restitution	0.3
	静摩擦因数Static friction factor	0.5
	动摩擦因数Dynamic friction factor	0.05
半夏与筛网Pinellia ternate and screen mesh	恢复系数Coefficient of restitution	0.525
	静摩擦因数Static friction factor	0.445
	动摩擦因数Dynamic friction factor	0.269

对象Object	参数Parameter	数值Numerical value
土壤Soil	泊松比Poisson's ratio	0.3
	密度Density/(kg·m^-3)	2 600
	剪切模量Shear modulus/P_a	5.0×10⁷
半夏Pinellia ternata	泊松比Poisson's ratio	0.3
	密度Density/(kg·m^-3)	1 012.68
	剪切模量Shear modulus/P_a	1.366×10⁷
筛网Screen mesh	泊松比Poisson's ratio	0.3
	密度Density/(kg·m^-3)	7 865
	剪切模量Shear modulus/P_a	7.9×10¹⁰
土壤与土壤Soil and soil	恢复系数Coefficient of restitution	0.2
	静摩擦因数Static friction factor	0.4
	动摩擦因数Dynamic friction factor	0.3
土壤与半夏Soil and Pinellia ternate	恢复系数Coefficient of restitution	0.06
	静摩擦因数Static friction factor	0.50
	动摩擦因数Dynamic friction factor	0.01
半夏与半夏Pinellia ternata and Pinellia ternata	恢复系数Coefficient of restitution	0.790
	静摩擦因数Static friction factor	0.452
	动摩擦因数Dynamic friction factor	0.024
土壤与筛网Soil and screen mesh	恢复系数Coefficient of restitution	0.3
	静摩擦因数Static friction factor	0.5
	动摩擦因数Dynamic friction factor	0.05
半夏与筛网Pinellia ternate and screen mesh	恢复系数Coefficient of restitution	0.525
	静摩擦因数Static friction factor	0.445
	动摩擦因数Dynamic friction factor	0.269

试验指标 Test index	标准值 Standard	试验结果 Test result
挖净率Net excavation ratio	≥95	97.3
伤损率Damage rate	≤5	3.51
含杂率Impurity content	≤5	4.97

Design and experiment of double layer flat screen type Pinellia ternate harvester

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