Shanghai Daoqin Plastics Co., Ltd.

in recent years, toward di screw extrusion machine development, its output/production volume, and speed large degree improve/increase, application day 益广泛. improve/increase toward di screw extrusion machine production efficiency, improvement product quality and achieve equipment more function is achieve its high property can basic requirements, is R&D difficulty/challenge in. improve/increase production efficiency 　　 improve/increase production efficiency is new type toward di screw extrusion machine development made important target/goal 之一, it can through improve/increase screw speed, reinforcement and mixed combined can force and other achieve. in same screw speed lower, increase large deep degree can make amount large degree increase. and versus requirements screw and mixed combined can force 也随之 increase large, this requirements screw can 够承受 more large 扭矩. in high screw speed lower, material material in extrusion machine inner time decrease/reduce, has can can make material material 塑化熔 melt, mixing/compounding 不够充 separation. is 此, need increase screw long degree, this also 必然导致 di screw extrusion machine 实际承载扭矩 and rate increase. increase large 螺槽自由容积也 is important factors. in add material and 脱挥段, 螺纹元 parts tool has large 自由容积 is non necessary, for/regarding density material material, increase large add material 段自由容积 and material material in in 充满程 degree, can large degree improve/increase extrusion machine production can force. improve/increase and speed, for decrease speed separation 配箱进行精心 design. need large degree improve/increase equipment indicators, will for 传动箱 design and manufacturing water 平提出 more high requirements. 扭矩越 high, 传动箱 in gears, 输出轴, bearings and other parts design, manufacturing degree, strong/high degree and hot requirements high, meanwhile for screw 芯轴, 螺纹元 parts and combined and other parts design manufacturing degree requirements more high. is need increase large 螺纹元 parts 自由容积, in screw outer 径不变 情况 lower, screw in will decrease small, this will make ratio gears and bearings 安装空间不够 issues more is 突出. improve/increase product quality need to high product quality, extrusion machine core parts ——塑化 system design heavy large. system main/primary screw and machine 筒, is multiple processing requirements, usually will screw and machine design formed 积木式组 combined structure. according to function can will screw separation formed add material 段, 塑化段, mixing/compounding 段, gas and extrusion 段. this in extrusion process in tool has different function, its structure same, and versus screw parts parameters 也各不 same, therefore how to 确定螺纹元 parts parameters formed is system design key/critical. 图1 笔者 utilizing toward di screw 三维实体造 type design 螺纹元 parts for toward di screw 说, in ratio （即两 screw in and screw semi ratio ）, 螺纹头数以 and 螺纹顶角 between in 一定 关系, can design, 否则两 screw between 会发生 dry 涉. is solution this issues, according to screw 运动轨迹 to screw 理论端面曲线, utilizing large type machine design （CAD） soft parts 三维实体造 type function, made di screw 几何造 type 程序, achieve di screw 三维实体图形显示, to type specifications 自清式螺纹元 parts parameters, 并检验两 screw combined 情况. in addition, also combined engineering 实践, 借助于计算 machine, formed has di screw 三维实体造 type, can use 检验两 screw is uniform, make material material in screw in 无死角, ensure screw tool has relatively strong/high can force, can has anti material material in machine inner time long degradation, this is manufacturing high 档, excellent plastics product provide good processing 手段. due to screw speed improve/increase, material material in extrusion machine inner time shrink short, is make material material can to more separation and mixed combined, can make material material temperature degree upper rise process 变 缓 and, to high quality product, remove need screw parts optimization combined outer, also need increase screw long ratio. 但L/D increase large, for machine manufacturing degree and 驱动功 rate and screw 芯轴 承载扭矩 requirements improve/increase, in manufacturing technology and structure design upper requirements has more high water 平. in addition, for gas 段螺纹元 parts optimization combined, in gas front 设立建 pressure parts, using/adopting large 导程螺纹元 parts, can improve/increase efficiency; another, in machine and extrusion machine using/adopting melt gears pressure, make extrusion machine amount 段末端 pressure reduce, screw has 效充满 long degree shrink short, has gas long degree add long, also can in 一定程 degree upper improve/increase gas 效果. achieve more function 化 随 di screw extrusion machine process applications 越 越广泛, in extrusion machine inner remove need formed generally add material, 输送, pressure shrink, 塑化, mixing/compounding, gas, and other outer, also requirements formed water, drying, degradation, reaction extrusion and other multiple process, requirements di screw extrusion machine tool has more material and more grade gas and other function. is meet/satisfy use different process and fast speed more new product requirements, in system design process in need heavy different 螺纹元 parts, machine and add material system development as. remove development type screw parts used for different combined outer, also design different type type machine 筒, remove use in 塑化, melt and 均化段 generally machine outer, also has belt/tape has upper add material machine 筒, belt/tape has 侧开口 侧 toward add material machine and glass fiber (GF), true machine 筒, 如图2 示. 图2 various machine 筒筒图 add material machine design formed add material is 楔形间隙形式, in add material 口 侧壁 and screw surface formed 一 直 to add material 口底部 in 心 楔形间隙, make material material can 够顺利 by belt/tape extrusion machine inner. toward add material machine is is add 入炭黑 and other difficult add material material or in screw inner time long easy separation understanding additives design, add material machine is is add glass fiber and other additives design. in gas machine upper, gas 口垂直 toward upper, gas in 心线沿 screw direction machine in 心线一定距离, from decrease small material material 因离心 force function by screw from gas 口甩出 can can property. design 自清, high 容积同 toward di screw amount add material device, it and toward add material device liquid 体注入 device combined, can to ratio use 经搅拌 device mixed combined, rear and material through add material add to di screw extrusion machine process more good mixed combined quality, can in 一定程 degree upper improve/increase output/production volume. also can design more gas plant/unit, 如自然排 gas and true gas system, will mixed combined process in volatile content 排出. use more grade gas can a large amount of volatile content, can will polymerization and mixed combined in steps 省掉, improve/increase production efficiency. for/regarding tool has more material and more grade gas extrusion machine 说, long ratio need large, is 36～48, can according to use processing process requirements 进行自由 adjustment. requirements machine and screw tool has high wear resistant function. 螺纹元 parts and 捏炼元 parts using/adopting high wear resistant hard alloy manufacturing. used for glass fiber reinforcement processing 时, ratio commonly used nitrogen lifespan long 6～8倍. machine using/adopting di metal sleeve/set improve/increase wear resistance, can long machine use lifespan. di metal sleeve/set is in 普通钢材 or low alloy 钢 筒体 inner composite/compounding thick 1.5～2.0mm SL100 high wear resistant type alloy, again 经特殊 machine processing formed, alloy hardness 达HRC58～64. 信息 源: 卓创资讯