聚四氟乙烯粉料气力自动加料装置研究

聚四氟乙烯

聚四氟乙烯粉料气力自动加料装置研究   

Research on Automatic Feeding Machine of PTFE Powder Based on Pneumatic Conveying

作　　者：马杰 李小宁 杨嘉斌
MA Jie, LI Xiaoning, YANG Jiabin （School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing Jiangsu 210094, China）

机构地区：南京理工大学机械工程学院,江苏南京210094

出　　处：《机床与液压》2017年第10期5-10,共6页
Machine Tool ＆ Hydraulics

摘　　要：聚四氟乙烯（PTFE）粉末是许多塑料成型件的原料,具有粒径小、流动性差的特点,不易自动输送,许多压制成型和挤出成型机仍采用人工加料,费力费时。针对这一问题,研发了一种聚四氟乙烯粉料自动加料装置。采用气流输送-真空集料原理,针对聚四氟乙烯粉料输送易板结、阀件易阻塞和磨损的问题,研制了搅拌机构、滑板阀、盖板阀等特殊部件,通过PLC控制,可实现聚四氟乙烯粉料的自动输送。通过试验,验证了理论分析并测得了应用所需的参考数据,对聚四氟乙烯粉料气力输送装置的研制和推广应用具有积极意义。
Polytetrafluoroethylene （PTFE） powder is the raw material of many plastic molded parts. Because of the characteristics of the small particle size, poor flow ability of PTFE, artificial feeding mode is still used in many compression molding and extrusion molding machines which takes a large number of labor hours. Aiming at this problem, a polytetrafluoroethylene powder pneumatic conveying machine was developed after deep investigation to the last research on powder delivery machine. In the machine, the theory of vacuum aggregating was adopted. Easy to harden, blocking valves and abrasion were the main problems of PTFE powder conveying. To solve those problems, some special parts were developed to convey PTFE powder steadily such as stirring mechanism, the orifice valve, the powder gas separation mechanism and the discharge valve. Through prototype experiments, the relationship between the inner duct powder conveying speed and distance was verified. In the long delivery experiment, the maximum transmission capacity and the relationship between the daily amount of powder and the service life of the filter were achieved. The research has positive significance to the development and application of PTFE powder pneumatic conveying machine.

关 键 词：聚四氟乙烯 气力输送 控制阀 气粉分离

分 类 号：TH122[机械工程—机械设计及理论]