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Influence of box geometry structure on flow field characteristics of particleboard airflow forming machine(PDF)

Journal of Forestry Engineering[ISSN:2096-1359/CN:32-1862/S]

Issue:
2020 No.06
Page:
114-120
Research Field:
装备与信息化 执行主编:周宏平
Publishing date:
2020-11-01

Info

Title:
Influence of box geometry structure on flow field characteristics of particleboard airflow forming machine
Author(s):
CHEN Qing1 ZHANG Jian1 SHI Minghong1 ZHOU Hongping1* SHEN Wenrong2 LIU Guangxin2 LIU Dong2
1. College of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing 210037, China; 2. Suzhou Sufoma Machinery Co. Ltd., Suzhou 215129, Jiangsu, China
Keywords:
airflow forming machine box geometry structure numerical simulation flow field characteristic
PACS:
S777
DOI:
10.13360/j.issn.2096-1359.202003027
Abstract:
In the production of particleboard, the particleboard forming machine plays a vital role in the uninterrupted production of particleboard. Particle mat forming is an important section in the particleboard production. The performance of the particle mat forming not only affects the thickness tolerance, mechanical properties, structural symmetry and surface quality of the board, but also plays a decisive role in the diversification of the board product specifications to realize special functions. The most difficult technical problem of the airflow forming machine is to control the characteristics of the airflow field, and the box geometry has an important effect on the internal flow field of the airflow forming machine. It is urgent to investigate the influence of the box geometry on the flow field characteristics of the airflow forming machine. In this study, the flow field of particleboard airflow forming machine was modeled physically and geometrically by the computational fluid dynamics method, and the numerical simulation of gassolid twophase flow field of particleboard airflow forming machine coupled with the particles movement was carried out. The correctness of the calculation model was verified by comparing the characteristic point velocity obtained from the experiment and simulation. By adjusting the box geometric parameters, the changing characteristics of the flow field were analyzed, so as to control the influence of the box geometric structure on the flow field characteristics inside the airflow forming machine. The simulation results showed that, compared with the forward movement of the cantilevered shoulder, the turbulence caused by the airflow was smaller when the cantilevered shoulder of the formed box moved backward, but the pressure at the end of the box increased obviously. When the shoulder of forming box was removed, the effect of turbulence was further reduced, but the pressure in the whole forming box increased sharply, which may lead to the damage of the suction outlet. When the shoulder of forming box was moved backward or removed, the deposition of particles on the underside was more uniform, resulting in the improvement of forming quality. The particles escaping from the air outlet of the box with the shoulder moved backward were less than those with the shoulder removed. In combination with various factors, to actually design the airflow forming body, it was necessary to set up the vest shoulder correctly and the forming body sill should be properly moved backward. The distance between the shoulders of the box body was less than 2 570 mm, so as to reduce the turbulence effect, improve the quality of particle forming and provide the actual particleboard production with solid theoretical basis.

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Last Update: 2020-11-11