Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (3): 903-911.doi: 10.13229/j.cnki.jdxbgxb20180102

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Effect of dynamic parameters on relationship between root‑cutting blade and soil in grassland

Fang LIANG1,2(),Yong YOU3,4(),De‑cheng WANG3,4,Guang‑hui WANG3,4,Chang‑bin HE3,Shuai LI3   

  1. 1. College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
    2. Key Laboratory of Agricultural Equipment in Mid?lower YangtzeＲiver, Ministry of Agriculture，Wuhan 430070，China
    3. College of Engineering, China Agricultural University, Beijing 100083, China
    4. Key Laboratory of Soil?machine?plant System of Chinese Agriculture Ministry, China Agricultural University, Beijing 100083, China
  • Received:2018-01-26 Online:2019-05-01 Published:2019-07-12
  • Contact: Yong YOU E-mail:liangfang101@sina.com;youyong@cau.edu.cn

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Abstract:

To reduce the interaction force and power consumption between the blade and soil in the grassland, and also to optimize the matching relationship between the rotation speed of the forward speed, the study investigated the effect of five velocity ratio(the ratio of the line velocity of the blade point to the forward speed) of five levels(16.9、20.7、24.5、28.2、32.0) on the torque, specific work(power consumption per volume), and the total power though the soil bin test. At each velocity ratio, there were three different combines of the forward speed (0.5, 1, 1.4 m/s) and different rotation speed calculated by the ratio and the forward speed. The results showed that the torque coefficient of variation were just 2.4%, 5.2%, 1.7%, 7.5%, 3.9% respectively, the specific work coefficient of variation were just 1.0%, 3.4%, 8.8%, 2.7%, 2.7% respectively when the velocity ratio was constant, demonstrating that the torque and the specific work were independent of the combines of the forward speed and the rotation speed, it was just determined by the velocity ratio. So the relationship between the velocity ratio and the torque, the relationship between the velocity ratio and the specific work, and the relationship among the total power, the rotary speed, and the velocity ratio were built. What’s more, to explain the relationships above, the relationship between the torque and the bite length, and the relationship between the specific work and the bite length were built. According to the relationships built above, the minimum torque was 90.79 Nm when the velocity ratio was 27.41, the minimum specific work was 6369 kJ/m3 when the velocity ratio was 26.31, the total power was 2362 W when the velocity ratio was 28 and the lowest rotation speed was 200 r·min－1. When the value of the velocity ratio was around 26.31 at which the specific work was minimal, the torque and the total power were both close to the minimum(with the difference of 1.2% and 4.2% from the minimum respectively), so that value was the most suitable velocity ratio for root?cutting in the grassland.

Key words: agricultural engineering, root?cutting blade, dynamic parameters, velocity ratio, soil?bin test, torque, specific work, total power

CLC Number: 

  • S222.3

Fig. 1

Parameters of the blade"

Fig. 2

Diagram of system of soil bin experiment"

Table 1

Effect of dynamic parameters of the blade on the relationship between the blade and the soil"

试验

序号

运动参数刀具?土壤作用关系
速比λ

前进速度/

(m·s－1)

转速/

(r·min－1)

牵引力/ N扭矩/（N·m）扭矩均值/（N·m）牵引功率/W

PTO

功率/W

总功率/W比功耗/(kJ·m-3)

比功耗

均值/(kJ·m-3)

116.90.52532691851901354901503683938495
2150615619115610120102768563
31.470313219418514281144668528
420.70.53098561371444284433486181018142
51618208143208925494627885
61.486035215249313688141818441
724.50.536521186871063287339256546089
8173145587455665971145923
91.4100013289156931994756691
1028.20.54211899096953968406267706981
11184314894148829884467038
121.18100012910415211937120897135
1332.00.54784441071102225356557892969479

14

15

195628311328311312115959662
----------

Fig. 3

Relationship between velocity ratio and torque"

Fig. 4

Relationship between bite length and torque"

Fig. 5

Relationship between velocity ratio and specific work"

Fig. 6

Relationship between bite length and specific work"

Fig. 7

Relationship between rotary speed and totalpower on different velocity ratios"

Fig.8

Relationship between velocity ratio , rotary speed and specific work"

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