失重式喂料系统的工作原理是什么？失重式给料机，失重式喂料机

Loss‑in‑Weight (LIW) Feeder 失重式喂料系统 工作原理

中英对照，适用于产品说明书、技术手册

原理概述

中文 失重式喂料机，核心原理：测量料斗单位时间内重量减少值，计算实际出料流量。每个物料通道拥有独立料斗、称重传感器、出料机构（螺杆/振动器）。系统实时检测料斗重量，计算重量下降速率，和设定目标流量做对比，闭环调节出料速度，实现恒定流量连续喂料。

区别于增重式GIW：GIW是物料落进同一个称重斗做叠加增重、间歇批次出料；LIW是每个料斗独立，看料斗自身重量流失、连续出料。

English Loss‑in‑Weight(LIW) feeder works by measuring the weight reduction rate of each hopper over time to calculate actual discharge flow rate. Each channel is equipped with independent hopper, load‑cell and discharge device (screw / vibratory feeder). The controller monitors hopper weight continuously, calculates real‑time throughput, compares it against target setpoint, and adjusts discharge speed via closed‑loop control to deliver constant continuous feeding.

Difference from GIW Gravimetric Batch Blender: GIW accumulates weight in one shared weighing chamber in intermittent batch cycles. LIW measures weight loss of each individual hopper for continuous output.

完整工作流程

1. 配料运行阶段（失重模式） 中文 料斗内装有原料，整套料斗组件全部架在称重传感器上。螺杆持续向外输送物料，料斗总重量不断下降。控制系统不断采集重量信号，计算： 实际流量 = 单位时间料斗减少的重量 把实际流量和配方设定流量对比；如果实际流量偏低，提高螺杆转速；流量偏高，则降低转速，闭环动态修正，保证输出流量稳定。

English Hopper assembly is fully supported by load‑cell. Material is discharged continuously by screw feeder, causing hopper total weight to decrease. Controller samples weight signal and calculates: Actual Flow Rate = Weight loss per unit time Compare actual flow with recipe setpoint. Increase screw speed if actual flow is low; reduce speed if flow is high. Closed‑loop adjustment maintains stable throughput.

2. 补料过程（容积模式） 中文 当料斗物料下降到*低料位，系统触发真空吸料机/上料机构向料斗补料。

   ⚠️补料瞬间：外部物料冲入料斗，料斗重量突然增加，失重称重逻辑失效。 此时系统短暂切换到容积模式（转速模式）：保持螺杆固定转速出料，依靠螺杆容积估算流量；补料完成，重量稳定后，系统自动切回失重称重模式，恢复重力闭环控制。

English When material drops to low‑level threshold, vacuum loader refills the hopper.

⚠️During refilling: incoming material causes sudden weight jump, loss‑in‑weight calculation becomes invalid. System temporarily switches to volumetric mode: screw runs at fixed speed, flow is estimated by screw displacement. After refilling finished and weight stabilizes, system switches back to loss‑in‑weight gravimetric mode automatically.

3. 循环往复 中文 失重计量运行 → 料位低触发补料（短暂容积模式） → 补料结束回到失重模式，持续向挤出机/造粒机连续供料。多台失重喂料机并排，各组分独立控制流量，物料在下游挤出机进料口汇合。

English Gravimetric loss‑in‑weight feeding → low‑level trigger refilling (temporary volumetric mode) → return to gravimetric mode after refill. Multiple LIW feeders run in parallel. Each material is dosed independently and converges at extruder feed throat.

关键要点

1. 每个通道独立称重，互不干扰，微量助剂也可以实现高精度；
2. 正常生产绝大多数时间处于失重重力模式；仅补料的短短几秒切换容积模式；
3. 输出是连续流量，不是批次，适配挤出、造粒连续工艺；
4. 可配搅拌破拱机构，处理部分粉体；
5. 补料阶段会有短暂流量扰动，依靠算法做补偿。

精简英文版本（用于样本）

Working Principle of Loss‑in‑Weight Feeder Each feeder hopper is mounted on individual load‑cell. The controller calculates real‑time throughput by measuring weight loss per unit time. Screw speed is adjusted by closed‑loop algorithm to maintain constant target flow rate. When hopper runs low on material, refill is triggered. During refilling, gravimetric measurement is invalid, unit runs in temporary volumetric mode. After refill completion, it switches back to loss‑in‑weight gravimetric mode automatically. Multiple feeders work in parallel for continuous multi‑component feeding to extruder or compounder.