Shanghai Daoqin Plastics Co., Ltd.

injection molding machine is types specialized plastics molding machine 械, it utilizing plastics thermoplastic property, add hot melt rear, add high pressure make its fast speed mold cavity, 经一段 time holding pressure and cooling, formed is various plastics products. injection molding machine electrical can consumption main/primary performance in below/following several separation:

① liquid pressure system electrical can consumption

② add hot device electrical can consumption

③循 ring cooling water electrical can consumption (in injection molding workshop inner, generally more injection molding machine use cooling water 泵), its in liquid pressure electrical machine use electrical amount injection molding machine use electrical amount 80% above, therefore reduce its consumption electrical amount is injection molding machine energy saving key/critical.

　　1, injection molding machine as ring

　　1)锁 clamping: fast speed 接近定模扳(包括 slow - fast - slow speed), 且确认无异 material in lower, system is high pressure, will sheet/plate combined (maintain inner pressure).

　　2)射台 front to 位: front to 指定位置(nozzle and mold 紧贴).

　　3) injection molding: can setting screw more speed degree, pressure and 行程, will material front solvent material mold cavity.

　　4) cooling and holding pressure: setting multiple pressure and time 段, maintain material pressure, meanwhile mold cavity cooling molding.

　　5) cooling and 预塑: mold cavity inner products cooling, meanwhile liquid force 马达驱动 screw will plastics pellets front 推, screw in setting back pressure control lower rear 退, screw rear to 预定位置, screw 停止旋转, injection 油缸按 setting 松退, material 结束.

　　6)射台 rear 退: 预塑结束 rear, rear to 指定位置.

　　7) mold opening: rear to 原位(包括 slow - fast - slow speed)

　　8) ejection: ejection products.

　　2.传统 liquid pressure injection molding machine can amount 浪费

　　 liquid pressure injection molding machine in above stage/phase pressure and amount is 变化, injection molding machine amount demand 发生变化时, in export ratio/proportion amount and ratio/proportion pressure 溢流阀 adjustment negative pressure and amount, provide 各油缸 and liquid force 马达 需 推 force, pressure direction and speed degree. 油泵 输出功 rate and other electrical machine 输出转矩 and electrical machine speed 乘积, system requirements low amount 时, electrical machine 输出功 rate 不变, more liquid pressure through pressure ratio/proportion and 溢流阀流回油箱, make 空载(如 cooling)也 is 如此, this 样, 节流功 rate loss non large, efficiency very low, generally has 60%-70%, 因而造 formed can amount 浪费, meanwhile due to liquid pressure long full speed ring flow, and liquid pressure parts, machine parts abrasion scratch, formed temperature high, large and other series issues, machine lifespan shrink short.

　　3. use energy saving frequency device control electrical machine

　　变 frequency device control electrical machine from upper 克服 传统 injection molding machine can amount 浪费 弊病, system need amount 发生变化时, electrical machine speed 也跟 发生变化, from make amount 油泵排出 油流 amount 发生变化, 即“ need how much to how much, from 而节约 a large amount of electrical can. according to injection molding products different, electrical rate 达20%-70%.

　　4.变 frequency device control 信号 选取

　　 for renovation injection molding machine need separation understanding its control electrical 路, liquid pressure electrical and as principle, 巧妙取 control 信号, achieve has injection molding machine and frequency device combined. injection molding machine liquid pressure demand amount is pressure and amount ratio/proportion electrical 流信号(0-1A), separation rear 并转换 formed 4-20mA standards 信号直接连接 to frequency 输入端, from control frequency device 改变输出 frequency rate, 随即改变 油泵 electrical machine speed, to pressure electrical di heavy function. for injection molding machine liquid pressure system has large negative ultra- 载, frequency requirements high and low speed large, electrical machine add decrease speed time long features, in control process in application PLC control device, 引入各 electrical liquid toward 阀 信号, 由PLC according to this identification injection molding machine process process/workflow, front for frequency device to accelerated and decrease speed 指令.

　　5. injection molding machine frequency device type

　　1)普通 VVVF调 speed methods, frequency rate and electrical pressure ratio rate maintain 恒定, electrical machine magnetic 通不变, due to has speed degree 反馈, can control electrical machine speed (generally in 15%), versus electrical machine 转子实际转 speed 同定子旋转 magnetic 场间存 in 转差, external negative 载发生变化时, rate 也随之发生变化, frequency device can for 此补偿, 导致油泵转 speed 发生变化, formed amount 误差, product rate high. injection molding machine in using/adopting pressure ring control system in, 会出现 pressure 瞬间失调 情况, method control products quality.

　　2)无传感 device amount control frequency device, using/adopting magnetic direction control methods, for electrical machine 进行坐标变换 and other formed electrical machine control methods, versus 当于直流 electrical machine in 同转矩 formed positive ratio electrical electrical 流, electrical machine 状态, its magnetic electrical 流 恒定, 而转矩 large small need adjustment electrical electrical 流, can make electrical machine 始终处于 high 动态 状态, from 0rpm accelerated to 1000rpm 需30ms, improvement frequency device speed system property can, for/regarding injection molding 整 运行循 ring property large large improve/increase, in 3%-5% inner, improve/increase electrical machine for negative 载变化 运转 stability property, electrical machine in low speed 运转时 has 2倍 above 额定转矩, has relatively good add decrease speed property can, 转矩变化时响应也 fast.

　　综 upper 叙, selection ring general purpose frequency device, due to its slow, suitable for injection molding machine 油泵 调 speed, versus ratio lower 无感矢 amount control frequency device, its high property, stability property good and other features more combined injection molding machine use.

　　6.变 frequency device dispersion hot methods

　　 injection molding machine specialized frequency device using/adopting water cold dispersion hot methods, dispersion hot efficiency high, safety and other grade can 达IP54. due to frequency device using/adopting water cold 形式, frequency device 主体实际 is 封闭于 electrical inner, decrease/reduce due to powder 尘, 油污侵入 electronics equipment 而导致 loss bad can can property, ensure frequency device use safety, meanwhile using/adopting water cold dispersion hot methods can make frequency device rate mono 元IGBT始终工 as in certain temperature degree scope/range inner, has long its use lifespan, using/adopting water cold dispersion hot methods can make frequency device lifespan long 达10 year above.

　　7. use frequency device rear its it function

　　 most significantly features is can machine process features, improve/increase its efficiency. has product requirements very high speed degree, injection molding machine, can can need more screw, material 筒, electrical machine, 油泵才 can to requirements speed degree, use frequency device rear, in electrical machine 油泵允许 scope/range inner, will electrical machine speed improve/increase 10%(electrical machine frequency rate to 55HZ), can to use more 换任何部 parts can to requirements speed degree, from improve/increase production efficiency.

　　8. use in attention/notes issues

　　经测 amount using/adopting frequency rear, electrical machine surface temperature degree has improve/increase, 例如工 frequency electrical machine temperature degree is 35 degree, frequency 运行时 electrical machine is 40 degree, 且不继续 rise high (in electrical machine safety scope/range inner), this is due to electrical machine in cycle inner, different speed 运行, electrical machine dispersion hot 风扇风 force decrease small 缘故, use in maintain dispersion hot and electrical machine 清洁.