Anti-blocking performance of ultrahigh-pressure waterjet assisted furrow opener for no-till seeder

Abstract

No-till planting method is widely used for maize-wheat two-crops-a-year area in the North China Plain. However, cruel soil conditions, especially the large number of maize stalks which are hard to cutoff covering, often cause an unsatisfying planting quality. Based on the authors' previous investigation, ultrahigh-pressure (UHP) waterjet is capable to solve this problem and obtain qualified seedbeds. Thus, a UHP waterjet assisted furrow opener for no-till seeder was designed. Field tests showed that double-disc furrow openers worked well with UHP waterjet, since the sharpened disc blades could help to cut soil and residue, meanwhile, minimize soil disturbance. Response surface method (RSM) was used to investigate the relationship among forward speed, waterjet pressure, jet impingement angle and anti-blocking performance (stalks cutoff ratio and depth of soil cutting), and a Box-Behnken three-factor design was used to identify the optional operation parameters. A total of 17 combinations were conducted, and the results showed all three operation parameters significantly affected anti-blocking performance. Stalks cutoff ratio and depth of soil cutting increased with the increase of waterjet pressure, jet impingement angle, and decreased with the increase of forward speed. The optimization analysis indicated that when waterjet pressure was 267-280 MPa, jet impingement angle was 80.2° to 90.0° and forward speed was 4.00-4.42 km/h, the overall performance of UHP waterjet assisted double-disc furrow opener for no-till seeder was maximized. Stalks cutoff ratio could be above 95% and no blockage occurred. This study may provide a new approach and reference for the anti-blocking technology of no-tillage seeding.

Adubação antecipada e formas de distribuição do fertilizante na semeadura do milho

“…O maior acúmulo de resíduo vegetal nos tratamentos a lanço pode ser relacionado a forma de aplicação do adubo, mecanismos sulcadores tendem a incorporar a palhada acumulada sobre o solo, diminuindo a quantidade de resíduo comparada com a distribuição do fertilizante a lanço, que distribui o fertilizante sobre o solo (Hu, et al, 2020). A quantidade de resíduos vegetais incorporados no solo pelos mecanismos sulcadores varia, também, com a compactação do solo em SPD, que aumenta a demanda por força do trator e o trabalho da haste e disco, aumenta a probabilidade de embuchamento do implemento por palhada, que pode ter aumentado a incorporação na testemunha (Theodoro, et al, 2018).…”

Cutting Techniques in the Fish Industry: A Critical Review

“…Some parameters, such as surface roughness, need to be further investigated and adapted to evaluate the fish-cutting quality. As for simulation development, current simulation models for cutting processes and quality are mainly based on regression analysis, response surface methodology (RSM), computational fluid dynamics (CFD), and finite element method (FEM) [ 151 , 152 , 153 , 154 ]. Since the waterjet cutting method has great potential for fish cutting, future fish cutting simulation and theory development should pay more attention to pure and abrasive waterjet cutting processes of whole fish and fish fillets with higher accuracy and robustness.…”

Study of Patterns of Movement of Groups of Seed Potatoes in Conical Seed Box Based on the Dem-Model of the Process

“…Europe has standardized the design of the steel-shell structures [13] and announced modern technology and special equipment for potato production [14]. In China, the seed-box structure is designed mostly as the intersection-angle type, according to the empirical design method [15][16][17]. The arching problem of particles in the box first appears at the intersection angle of the steelplate welding (bending) [18] due to the bad dynamic conditions of particle flow at the intersection angle, the increased resistance and the long-term retention of materials, so the discharge is stopped to form an arching phenomenon [6,19].…”