Abstract
In order to solve the problems of uneven stubble, low cutting efficiency and frequent breaking and blocking in the cutting and conveying links of ramie combine harvester, a reciprocating double movable blades cutter and a double-layer chain conveyor were designed, and the operating parameter test and optimization were carried out by using the central combination test design theory, with the emphasis on the influence of the forward speed, the cutting speed of the cutter and the conveying speed of the chain on the cutting efficiency, the failure rate and the conveying rate, and the multi-objective optimization was carried out based on these response indicators. Firstly, the structure and operating parameters of the cutting-conveying mechanism of ramie combine were studied. Then, the experiment was designed by the quadratic orthogonal rotation combination test method, and the data is processed by Design-Expert. The regression mathematical model of cutting efficiency, failure rate and conveying rate was established and variance analysis was carried out. By analyzing the effect of interaction of various factors on cutting efficiency, failure rate and conveying rate by response surface methodology, and performing multi-objective optimization on the regression model according to the importance of the optimization target, the optimal combination of the operating parameters of the cutting-conveying parts of the ramie combine harvester was obtained: when the forward speed was 0.85 m/s, the cutting speed was 1.40 m/s, and the chain conveying speed was 1.33 m/s, the cutting efficiency and conveying rate were the maximum and the failure rate was the minimum, with the values of 44.36 plants/s, 93.60% and 4.16%, respectively. The optimized parameters were verified in the field on the ramie combine harvester. In the field test, the cutting efficiency, conveying rate, and failure rate were 43.80 plants/s, 92.45%, and 4.52%, respectively, and the relative errors with the optimized values were 1.3%, 1.2%, and 8.7%, respectively, which was relatively consistent. Keywords: ramie, harvester, operating parameters, multi-objective optimization, response surface DOI: 10.25165/j.ijabe.20201306.5952 Citation: Huang J C, Tian K P, Shen C, Zhang B, Liu H L, Chen Q M, et al. Design and parameters optimization for cutting-conveying mechanism of ramie combine harvester. Int J Agric & Biol Eng, 2020; 13(6): 94–103.
Highlights
Ramie is widely used as an ideal plant protein crop for forage, which is rich in nutrients such as protein, lysine, carotenoid and calcium[5,6,7]; the root of ramie is a kind of traditional Chinese medicine, with multiple pharmacological activities such as hemostasis, analgesic, detoxification, antiviral, bacteriostasis, liver protection[8,9]; ramie fiber, as a type of environmental-friendly and low-cost biological resource, is one of the preferred materials for composite material reinforcement, with the advantages of long length, high crystallinity and large modulus of elasticity[10,11,12]; the stalks of ramie are high-quality raw materials for papermaking, carbon powder and edible fungus substrate[13,14]
Based on the research of the self-developed ramie combine harvester, the relationship between operating parameters of cutting and conveying parts and operating quality is studied by taking cutting efficiency, failure rate and conveying rate as the target and combining with field trial
The condition for the blade to clamp ramie stalk is that the resultant force R1 and R2 acting on the two contact points are in the same straight line
Summary
Largest ramie producer in the world, with the largest planting area and output, accounting for more than 90% of the world’s total planting area and output. Nanjing Institute of Agricultural Mechanization, Ministry of Agriculture and Rural Affairs, has carried out research on ramie harvesting machinery. In the early 1990s, Japan once tried to develop ramie harvester by using sensing technology, even designed drawings and test devices, but failed to carry out in-depth research, and the prototype structure has not been reported. Based on the research of the self-developed ramie combine harvester, the relationship between operating parameters of cutting and conveying parts and operating quality is studied by taking cutting efficiency, failure rate and conveying rate as the target and combining with field trial. The influence of each factor on the operating quality evaluation index, as well as the best combination of parameters are explored in order to guide the field operation of ramie combine harvester and provide a reference for the design of ramie combine harvester
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