Design and Test of Double-Shaft Type Sweet Potato Haulm Cutting Return Machine

This paper aims to solve the problems of complex structure, poor straw crushing effect and high power consumption of existing straw returning machines. A cutting and crushing device with moving and fixed blades has been developed. The moving blade has collision and automatic retraction functions, which can effectively reduce destructive damage caused by blade obstacles and extend its service life. The double-type single-support cutting method has the advantages of improving the straw crushing effect and reducing the running power consumption. The effects of blade rotational speed, blade offset angle and blade number under the condition of composite single-support cutting were tested according to the uneven ratio of straw throwing and the qualification ratio of straw crushed length. The optimal combination of working parameters of the cutting and crushing device was determined: blade rotational speed of 1968 r/min, blade offset angle of 5°, blade number of 4. The test results show that the uneven ratio of straw throwing is 17.18%, and the qualification ratio of straw crushed length is 92.23%. The operation effect of the side-sweeping straw returning machine was tested on the field. All operating indicators are equipped with cutting and crushing devices, and the results show that all operating indicators meet the technical requirements of straw return.

Design and Experiment on Cutting and Crushing Device of Side-Sweeping Straw Returning Machine

WANG,

LI,

et al. 2024

Sweet Potato Vine Cutting Machine: Key Components Design and Experimental Research

MA,

LI,

LIN

et al. 2024

In response to technical challenges such as the difficulty in cutting long sweet potato vines in ridge furrows, low stem crushing rate, long stubble residues, and sweet high potato damage rate with the direct shredding and returning machine for sweet potato vines, this study conducted research on ridge furrow long vine removal and crushing technology, as well as optimization experiments on operating parameters. A ridge furrow boot-type vine picking knife structure, a "dynamic embedding static" shaft end anti-entanglement mechanism, and a ridge-like crushing chamber structure were designed. A high-efficiency sweet potato vine shredding and returning machine was developed, with ridge surface vine length qualification rate and ridge top stubble height as the main control indicators. The study conducted a 3-factor, 3-level orthogonal experiment in typical regions to analyze the factors of machine forward speed, knife roller speed, and ground clearance height, which significantly influence the performance. The results indicate that the optimal working parameters for the sweet potato vine cutting machine are a knife roller speed of 2000 r/min, a forward speed of 0.6 m s-1, and a ground clearance height of 10 mm. The vine crushing length qualification rate reached 94%, and the stubble height of 5.3 cm exceeded the various indicators, meeting the agricultural requirements for sweet potato harvesting.

Design and Experiment of Sweet Potato Combine Harvester Based on Two-Segment Potato Soil Separation Device

YANG,

WU,

et al. 2024

Aiming at the problems of high skin-breaking rate and high impurity rate of sweet potato during harvesting operations, a low-damage fresh-eating sweet potato combine harvester based on a two-segment potato-soil separation device was designed by using a “d”-type elevator chain combined with a double-buffer clearing platform technology. The results show that the best working parameters of the harvester are a vibrating shaft frequency of 5.2 Hz, elevator chain speed of 0.37 m/s, and cleaning platform speed of 0.58 m/s, in which the sweet potato skin-breaking rate is 1.09% and the impurity rate is 1.90%, which is in line with standard.