Experimental Study on Air Flow Field Characteristics of Suction Metering Device

Faults and failures analyses consist of a very varied field of technique, so concepts and reliability indicators help us to determine the types of faults easier, their appearance in functioning and mathematical relations for determining the types of failures. Regarding to, the test stands help us to identify accelerated of noises, vibration and serious faults that occur in use and can lead to disposal of equipment, helping engineers quickly find the optimal solutions for most cases. Current methods used to determine agricultural tractors gearboxes reliability are those in open energy flow, they better simulate the real working conditions. We design a gearbox test stand for a rapid noise and vibration reliability diagnoses and tests. Considering the gearbox work conditions and its random possible failures, the stand will be equipped with transducers and a data acquisition system for data collection.

Section: Resultsmentioning

confidence: 99%

Studies on the Development of a Reliability Diagnosis for Agricultural Tractors Gearboxes

HELLER,

FILIP,

DEAC

2023

Design and Experiment of Pressure-Holding Precision Seed-Metering Device for Maize

Zhang

Cheng

ZHANG

et al. 2023

In order to further improve the seeding performance of the maize seed-metering device, a pressure-holding precision seed-metering device for maize was designed. The seed-metering device is made up of several seed rowing modules, which effectively solves the problems of inconvenient disassembly and complex maintenance of the current maize seed-metering device. The working principle of the device was introduced, and the mechanical and kinematic analysis of the maize seeds during the seeding operation was carried out. The orthogonal test was carried out with the installation diameter of seed-metering device's guide plate, torsion spring's wire diameter and seed-metering device's rotational speed as the test factors, the single-seeding rate, missed-seeding rate and multiple-seeding rate as the indexes, and the relationship between different test factors on the performance of seed-metering device was obtained. By optimizing the model, the best performance of the seed-metering device was obtained when the installation diameter of the guide plate was 92.32 mm, the wire diameter of the torsion spring was 1.59 mm, and the rotational speed of the seed-metering device was 0.41 r/s. At this time, the single-seed rate was 93.08%, the missed-seeding rate was 3%, and the multiple-seeding rate was 3.9%, which met the requirements of the industry standard.

Design and Experiment of Small Vegetable Seeder With Single Disc Multi-Row Seeding and Independent Airway

ZHANG,

YANG,

et al. 2023

In this paper, a small pneumatic vegetable precision seeder suitable for facility greenhouses was designed. Based on the traditional positive and negative pressure seed-metering device, the airway disc structure was designed, and the negative pressure air chamber was divided into three separate air chambers. The separate air chambers could solve the problems of high-pressure requirements of traditional seed-metering device with large air chamber and suitable for small power machineries more. One, two, or three rows drill can be completed by replacing the seed plate and divider. The seed discharge process of the seed-metering device was analyzed and the bench test was performed. Results showed that the required pressure of the seedmetering device with the airway disk was 1 kPa less than traditional seed-metering device with large air chamber when the eligible rate of seed discharge was 95%. Field experiments were performed, results showed that the best performance were achieved under the speed of 3 km/h, for 3.72 % missed, 1.93% repeat and 94.35 % of inner ring, and 5.72%, 1.87% and 92.41% respectively of outer, meeting the requirements for vegetable seeding.