Design and Experiment of Centrifugal Collision Test Device for Millet and Sweet Buckwheat Grain

In order to reduce the harvest loss and optimize and improve the comprehensive performance of the combine harvester, the relationship between the feeding quantity, drum torque, drum speed, harvest loss, and other factors of the wheat combine harvester is studied, and the functional relationship between the loss, feeding quantity and speed is determined. According to the test data, the relationship model between the feeding quantity of the harvester and the drum torque is a quadratic function. For the land with uniform growth, the size of feeding quantity is mainly affected by the forward speed of the harvester. In this way, this paper indirectly achieves the purpose of controlling the feeding quantity by controlling the speed of the harvesting machinery. The control system designed in this paper uses the compensated fuzzy PID to control the walking speed of the vehicle through real-time detection of the drum torque, drum speed and loss of the harvester, so as to comprehensively control the working speed of the harvester and effectively control the harvest loss. The test results show that the control system can effectively reduce the harvest loss and improve the harvest efficiency compared with the manual harvest of the wheat.

Section: Scheme Design Of the Speed Control Systemmentioning

confidence: 99%

Study on the Loss Control System of Wheat Combine Harvester

WANG

Fang

Fengzhu

et al. 2023

Design and Application of a Test Bench for Rotation Type Anti-Blocking Device of No-Minimum Till Seeder

Zhao

Zheng

Zhang

et al. 2022

Anti-blocking and seedbed cleaning are one of the key processes in no-minimum till seeding in the Northwest arid area in China. Soil tillage performance and straw cutting performance such as tillage depth stability, straw cutting ratio, torque requirement are important indexes that influence anti-blocking and seedbed cleaning performance. In order to investigate the performance of rotation type anti-blocking device of no-minimum till seeder under different operation parameters, this paper designed a rotation type anti-blocking device test bench. It mainly comprises frame, torque sensor, speed sensor, speed-adjustable motor, straw fixture, rotation blades and land wheel, its working width was 1100 mm. The torque requirement could be determined with torque sensor and rotation speed could be determined with proximity speed sensor. The test bench could hitch with test vehicle of soil bin to conduct experiment. With the test vehicle, travel speed could be adjusted; with the speed adjustable motor, rotation speed (0-300 r/min) could be adjusted; besides, operation performance of different rotation type device can be determined by changing the device. Soil bin experiment of idling test, tillage test and straw cutting performance test was conducted taking rotation speed as testing factors and torque and straw cutting performance as response indicators. Results showed that tillage depth stability of the test bench was 87.2%, and it could satisfy the test requirement and operation steadily. Results of the tillage experiment showed that torque requirement of tillage and idling test both increased with the increase rotation speed significantly; results of the straw cutting test preliminarily found that the critical cutting speed under supported cutting was between 100-200 r/min under the given condition. This study could provide reference for the performance research for anti-blocking device of no-minimum till seeder.

Optimization of Stirring Parameters for Millet Fluid Seed Metering Based on Response Surface Methodology

ZHANG

Cui

et al. 2022

Fluid seeding is a new technology for drought resistance, water saving and yield increase in modern agriculture. To improve the uniformity of fluid seed metering of millet, the mechanical stirring device was added to the metering device, and the single-factor tests were carried out on the size parameters of the pump tube, the installation position and the parameters of mechanical stirring. The stirring speed, the ratio between the length of stirring paddle and the diameter of seed box and distance between the pump tube and the stirring paddle were selected as independent variables, and the right rate of hill distance, right rate of seeds per hill and rate of no seed hill were selected as response values. According to the test design principle of Central Composite Design, a response surface analysis method was used to establish mathematical models between each experimental factor and performance index, and the influencing factors of fluid seed metering were analyzed. The single-factor test results showed that when the pump tube was installed on the side of the seed box, and its inner diameter and wall thickness were 4.8 mm and 1.6 mm, respectively, the seeding performance was better. The response surface test results showed that the selected factors all have an influence on the performance of millet fluid seed metering, and the optimal stirring parameters were the stirring speed of 30 r/s, the ratio between the length of stirring paddle and the diameter of seed box of 0.69, and distance between the pump tube and the stirring paddle of 0.11 cm. The verification test was conducted under these parameters, and the right rate of hill distance, right rate of seeds per hill and rate of no seed hill were 94.14%, 84.24%, and 2.21%, respectively, and the error from the predicted values was less than 4%. The performance indexes of fluid seed metering were improved compared with the fluid seed metering device without stirring device, indicating that the optimized stirring parameters can improve the performance indexes of millet fluid seed metering. This study can provide a reference for the research and development of key technologies and equipment for precision fluid seed metering of millet.