Study on the Dynamic Cutting Mechanism of Green Pepper (Zanthoxylum armatum) Branches under Optimal Tool Parameters

Abstract

In order to design a branch-cutting type green pepper harvesting device, we firstly study the whole process of straight knife green pepper cutting to reveal the cutting mechanism and provide theoretical guidance to the design. A finite element model was established for the cutting of pepper branches across the distance, and single-factor and multi-factor finite element simulation tests were conducted on the knife feed angle, tool edge angle, and knife feed speed of the working parts of the pepper cutting and harvesting device. The results of the experiment were analyzed by ANOVA, which showed the different degrees of importance of these factors, and the optimal parameters were obtained by response surface methodology (RSM). With the optimal parameters selected, the predicted maximum cutting force and cutting completion were 803.35 N and 98.58%, respectively, this satisfies the efficiency and economy requirements of agricultural machinery design. In addition, the cutting force of green pepper branches was analyzed and a theoretical mechanical model was developed to help us understand the variation of cutting force numerically. The stress–strain system, high-speed photography system and numerical prediction were innovatively combined to observe and measure the stress and other key state variables in the cutting process in detail, summarize their changing trend, and establish a time-based monitoring and comparison model. The above research results can provide a reference for the design of green pepper branch cutting and harvesting devices, such as direct guidance on the selection of working parameters, materials, etc., and guidance on the operation in actual work.

Parameters Calibration of Discrete Element Model for Corn Straw Cutting Based on Hertz-Mindlin with Bonding

“…Corn is one of the major food crops in China, and with the increase in planting area, the amount of corn straw resources as a by−product of agricultural production is also increasing, accounting for 42.87% of the total straw of the three major food crops [1]. In the process of achieving "carbon peaking" and "carbon neutrality", the potential use of maize straw is increasingly valued, playing a huge role in the manufacture of biofuels [2], livestock feed [3][4][5], soil nutrients [6][7][8], and composite materials [9][10][11], and straw cutting and shredding are prerequisites for the effective use of crop straws, from silking to shredding for field return [12][13][14]. The coarse fiber of corn straws at maturity formed, and the cutting process, requires a large cutting force to ensure that the shredded segments of corn straws meet the requirements [15], so the development of cutting and shredding equipment dedicated to corn straws to improve the shredding quality of corn straws is essential to promote the comprehensive utilization of corn straws.…”