Overview
Screw weighing machines are essential equipment in process industries requiring precise material dosing. They combine the functions of a screw conveyor with precision weighing technology, typically using load cells to measure material flow gravimetrically. Modern variants integrate with PLC systems for automated batching processes. These machines excel in handling free-flowing to moderately cohesive materials like flour, plastics pellets, or mineral powders. Their modular design allows customization for specific industry requirements, including food-grade finishes or explosion-proof configurations for hazardous environments.
Structure and Working Principle
The core components include a driven screw (auger), weighing hopper with load cells, drive motor, and control unit. As material moves through the screw flights, the integrated weighing system continuously measures mass flow rate based on the force exerted on the load cells. Advanced models employ twin-screw designs for difficult materials. The control system calculates actual throughput by combining screw rotation speed (RPM) with real-time weight data, automatically adjusting feed rates to maintain target values. Some industrial versions achieve accuracies of ±0.25% with proper calibration.
Key Features
1. **Precision Control**: Most models offer ±0.5-1% accuracy with regular calibration. High-end pharmaceutical versions may reach ±0.25%. 2. **Material Adaptability**: Screw pitch and flight design can be customized for powders, granules, or flakes. Special coatings prevent material adherence. 3. **Hygienic Options**: Food-grade models feature polished surfaces, quick-release mechanisms, and CIP/SIP compatibility. 4. **Smart Integration**: Modern units support Industry 4.0 protocols like OPC UA for seamless data exchange with SCADA systems.
Application Areas
**Food Processing**: Precise ingredient dosing for baking mixes, seasonings **Plastics Industry**: Coloring masterbatch addition with ±1% accuracy **Chemical Plants**: Hazardous material handling with explosion-proof designs **Pharmaceuticals**: GMP-compliant versions for active pharmaceutical ingredients In cement plants, heavy-duty variants handle abrasive materials like fly ash. Agricultural applications include fertilizer blending systems where multiple screw weighers operate in parallel for recipe formulations.
Maintenance and Precautions
Monthly checks should include: load cell verification, screw wear inspection (especially for abrasive materials), and drive chain/belt tension. Annual professional calibration is recommended using certified test weights. Common issues like material buildup can be mitigated with vibrators or air purges. For sticky materials, Teflon-coated screws reduce cleaning frequency. Always power off before internal inspections to prevent accidental activation of the screw mechanism.
B2B Procurement Guide
When sourcing screw weighing machines: 1) Specify required accuracy (±0.5% vs ±1%), 2) Provide material characteristics (bulk density, flowability), 3) Confirm interface requirements (analog 4-20mA or digital communication). Leading manufacturers include Siemens (Milltronics), Schenck Process, and Brabender Technologies. For budget-conscious buyers, Chinese manufacturers like Shanghai Zhende offer reliable units at 30-50% lower cost but verify quality certifications. Lead times range from 4-12 weeks for custom configurations.
Related Manufacturers
- 主营：[]
- 主营：烟道插板阀、星型卸料器、布袋除尘器、输送机、螺旋秤、螺旋输送机、斗式提升机、刮板输送机、称重螺旋输送机、水冷降温螺旋输送机、无轴螺旋输送机、双轴螺旋输送机、埋刮板输送机、链式输送机、烟气挡板门、通风蝶阀、百叶阀、重锤翻板阀
- 主营：排设备、干排筛、水洗砂、捞砂机、分离机、脱水机、输送机、回收机、洗砂机、洗沙机、提升机、链板机、振动筛、筛石头、泥石土、石头槽、脱水斗、气流筛、板链斗、水洗沙、石英粉、石英砂、摇摆筛、输送量、滚轴筛
- 主营：肥料包装、控制工艺、自动吨袋、煤块包装机、机器人搬运、包装机粉剂、包装机吨袋、机器人纸箱、包装机粉末、包装机颗粒、型煤包装机、码垛机器人、锂电池新材料吨袋包装机、自动配料
- 主营：大袋称重灌装机、螺旋秤、配煤机、配矿机、定量包装机、吨袋拆包机、打散机破碎阀、皮带秤、失重秤、除铁器
- 主营：螺旋计量秤、螺旋定量给料机、皮带定量给料机、自动定量包装机、皮带输送机、电子皮带秤、皮带配料秤
- 主营：除尘器、活性炭吸附箱、输送设备配件、加湿搅拌机、螺旋输送机、刮板机、斗士提升机、皮带机、除尘器配件
- 主营：气动阀门、电动油泵、称重传感器、搅拌机衬板叶片、搅拌机轴端密封、搅拌机齿轮、搅拌机配件、水泥螺旋输送机、搅拌机减速机、js1000搅拌机配件、搅拌机搅拌臂、js1500搅拌机配件、搅拌机料斗轮、螺旋减速机、螺旋输送机配件、螺旋中吊轴、js750搅拌机配件、水泥称量、料斗提升机、配料机配件、配料机齿轮、输送带、托辊、除尘器
- 主营：螺旋给料机、转子秤、永磁除铁器、电磁除铁器
- 主营：混凝土搅拌站配件、传感器、气缸电磁阀、搅拌机配件、搅拌机胶轮、搅拌机齿轮、配料机输送带、螺旋减速机、螺旋输送机配件、配料机配件、搅拌机减速机、绞龙中吊轴、齿轮变速箱、水泥仓安全阀、气动粉体蝶阀、液体对夹蝶阀、电动润滑油泵、电动黄油泵
- 主营：搅拌站、水泥罐、灰粉料仓、螺旋输送机、混凝土搅拌机、卧式水泥仓、污水处理罐
- 主营：气力输送机、螺旋喂料机、螺旋输送机、皮带输送机、扒料装车输送机、粉煤灰气力吸灰机、吸灰车、吸尘车
- 主营：水泥仓、水泥罐、卧式水泥仓、混凝土搅拌机、柴油搅拌机、混凝土搅拌站
- 主营：低压输送、粉料输送泵、气力输送器、提升机、驱动取料机、投料取料机、水平输送机、主营输送机、石头输送机、高位取料机、秸秆取料机、青储取料机、刮板取料机、斗轮堆取料机、堆取料机招标、链板式输送机、异型链板输送机、粉体输送设、负压气力输送
- 主营：粉碎机、助力风机、助力电机、圆盘造粒机、滚筒烘干机、滚筒冷却机、挤压造粒机、助力管道
- 主营：纤维转盘过滤器、转鼓式精密过滤器