Study on round rice straw bale wrapping silage technology and facilities

Liqiao Li,Xing Yang,Defu Wang

doi:10.25165/j.ijabe.20181103.2855

Abstract

Specific to problems of the existing round bale wrapping machine in China, such as small application scope and failing to satisfy the wrapping demands of round bales of different specifications, a tumbler-type round bale wrapping machine based on wrapping silage with stretch film was designed. By theoretical analysis and preliminary experiments of the corresponding wrapping process, revolving speed of tumbler, speed ratio between tumbler and carrier rollers, and pre-load force of stretch film were determined as experimental factors, while wrapping time and consumption of stretch film per unit mass of round bale were determined as evaluation indexes. Furthermore, quadratic regression orthogonal rotational combination experimental design was adopted to carry out the wrapping experiment. The regression models were set up, and influencing rules of experimental factors on evaluation indexes were also analyzed. The optimal parameter combination scheme was revolving speed of tumbler of 31-32 r/min, speed ratio between tumbler and carrier rollers of 2.6, and pre-load force of stretch film of 20-22 N. Under such a circumstance, the corresponding wrapping time required was 37.7-38.9 s and consumption of stretch film per unit mass of round bale was 3.21-3.46 kg/t. The predicted values and the measured values of evaluation indexes basically coincided with each other and the relative error fell below 5%, which indicated that both the optimized regression models acquired through the wrapping experiment and the relevant parameter optimization results were reliable. To guarantee the quality of rice straw silage, the round bale should be wrapped by no less than five layers of stretch films through the utilization of the tumbler-type round bale wrapping machine. The study results could be used as references for research and development of the round bale wrapping machine. Keywords: round bale, silage, wrapping machine, tumbler-type, analysis, experiment DOI: 10.25165/j.ijabe.20181104.2855 Citation: Li L Q, Wang D F, Yang X. Study on round rice straw bale wrapping silage technology and facilities. Int J Agric & Biol Eng, 2018; 11(4): 88-95.

Highlights

With an annual output up to 0.6-0.8 billion tons[1,2], the extremely abundant crop straw resources in China can be utilized as feeds, fuels, fertilizers and industrial raw materials, etc.[2,3] To be specific, when rice straws are utilized as feeds, the traditional way of loose outdoor stacking gives rise to deduction in nutrition ingredients and poor palatability[4]
In countries with developed animal husbandry, the round bale wrapping machine had begun to blossom in the 1980s
The major diameter and length of round bales, which can be wrapped by the wrapping machine, range from 1000 mm to 1500 mm

Summary

Introduction

With an annual output up to 0.6-0.8 billion tons[1,2], the extremely abundant crop straw resources in China can be utilized as feeds, fuels, fertilizers and industrial raw materials, etc.[2,3] To be specific, when rice straws are utilized as feeds, the traditional way of loose outdoor stacking gives rise to deduction in nutrition ingredients (with a loss rate reaching 30%-50%) and poor palatability[4]. In countries with developed animal husbandry, the round bale wrapping machine had begun to blossom in the 1980s. The major diameter and length of round bales, which can be wrapped by the wrapping machine, range from 1000 mm to 1500 mm. Studies on the wrapping machine started relatively late in China, and existing wrapping devices are predominant by the small machine which cannot satisfy the wrapping demands of round bales obtained by the round baler available (major diameter/length between 500 mm and 1000 mm)[10]. The wrapping machines developed in foreign countries require large powers and higher prices so that it is less likely to meet the practical wrapping needs of round bales in China[10]. It is very necessary to develop wrapping machines applicable to meet the above mentioned needs

Methods

Results

Conclusion