Overview
The double helix screw feeder scale represents an advancement in continuous weighing technology, addressing common challenges in bulk material handling. Unlike single-screw feeders, its parallel helical screws create overlapping material flow patterns that prevent segregation and ensure consistent feed density. Originally developed for cement industry applications in the 1990s, this design has evolved to serve diverse sectors requiring precise mass flow measurement. Modern units incorporate strain-gauge load cells with digital signal processing, achieving measurement uncertainties below 0.5% of actual flow rate. The equipment's modular architecture allows customization of screw diameter (150-600mm typical), length-to-diameter ratios (5:1 to 30:1), and housing configurations to accommodate explosive, hygroscopic, or high-temperature materials.
Structure and Working Principle
At its core, the system comprises two intermeshing Archimedean screws rotating in opposite directions within a U-shaped trough. The screws' helical flights are precisely pitched to create progressive material displacement while minimizing particle degradation. A suspended weighing section—typically 1-3 screw diameters in length—contains load cells that measure the gravitational force of the material column. The working principle relies on the relationship between material mass flow rate and screw rotational speed. As material enters the inlet hopper, the screws transport it at a controlled RPM while the weighing module continuously calculates the mass per unit length. Integrated algorithms compensate for dynamic factors like material density variations and mechanical vibrations, outputting both instantaneous and cumulative weight data.
Key Features
Several engineering innovations distinguish high-performance double helix screw feeders. The overlapping screw design creates a self-cleaning action that prevents material accumulation in dead zones. Hard-faced screw tips and liners extend service life when handling abrasive materials like fly ash or mineral powders. Advanced models feature active tare functions that automatically compensate for buildup on screw surfaces, maintaining accuracy over extended periods. Explosion-proof variants with ATEX certification incorporate grounding systems and non-sparking alloys for combustible dust environments. Some manufacturers offer quick-release screw mechanisms that reduce downtime during maintenance or product changeovers.
Application Areas
This equipment excels in processes requiring both material transport and precise dosing. In cement production, it meters raw meal to kilns and additives to blenders with ±0.5% repeatability. Food processors utilize sanitary designs with USDA-approved finishes for ingredient batching in snack food and dairy operations. The pharmaceutical industry employs cGMP-compliant versions with validated cleaning procedures for active pharmaceutical ingredient (API) handling. Specialty chemical applications include feeding catalyst materials to reactor vessels and dispensing flame retardants into polymer extrusion lines. Emerging uses include biomass fuel feeding for gasification plants and recycled material proportioning in plastic compounding.
Maintenance and Precautions
Proper maintenance significantly impacts the feeder's longevity and accuracy. Monthly inspections should verify screw-to-trough clearances (typically 2-5mm), checking for wear patterns that indicate material buildup or misalignment. Load cell protection is critical—always support the weighing section during mechanical work to prevent transducer damage. Operational precautions include gradual startup with empty screws to avoid torque overload, especially with cohesive materials. For hygroscopic powders, consider heated housings or air purges to prevent moisture-induced bridging. When handling materials with varying bulk density, implement auto-tuning functions that adjust the control algorithm based on real-time feedback from the weighing system.
B2B Procurement Guide
When specifying a double helix screw feeder scale, provide vendors with detailed material characteristics including particle size distribution, bulk density (loose and packed), temperature, and flowability indices like Hausner ratio. Clarify required interfaces—common options include 4-20mA analog, Modbus TCP, or PROFIBUS connections for PLC integration. Evaluate suppliers based on their experience with similar materials and ask for references from comparable installations. Consider total cost of ownership: premium components like tungsten carbide screw tips may justify higher initial costs through reduced maintenance. For international projects, verify compliance with local standards such as IECEx for hazardous areas or NR-12 for Brazilian machinery safety requirements.
Related Manufacturers
- 主营：定量给料机、吨袋包装机、称重配料生产线、失重秤、螺旋秤、包装秤、皮带秤、减量秤、转子秤、称重给煤机、输送机、提升机、脉冲除尘器
- 主营：布袋除尘器、斗式提升机、粉尘加湿机、螺旋输送机、无轴螺旋输送机、管式螺旋输送机、称重螺旋输送机、刮板输送机、星型卸料器、通风蝶阀、插板阀、棒条阀、除尘布袋、除尘骨架、三通分料阀、叶轮给料机、波纹管补偿器、不锈钢星型卸料器、旋风除尘器、脉冲布袋除尘器
- 主营：星型卸料器、刮板输送机、插板阀、螺旋输送机、无轴螺旋输送机、管式螺旋输送机、称重螺旋输送机、斗式提升机、粉尘加湿机、通风蝶阀、布袋除尘器、脉冲布袋除尘器、单机布袋除尘器、烟气挡板门、不锈钢星型卸料器、板链斗式提升机、环链斗式提升机、星型卸灰阀、电动通风蝶阀、气动通风蝶阀、生石灰消化器
- 主营：除铁器、除铁机、磁力架、平板磁选机、磁性过滤器、链板输送机、自动除铁器、自动配料系统
- 主营：称重给料机、定量给料机、称重给煤机、电子皮带秤、高精度皮带秤、螺旋秤、失重秤、皮带采样机、液压纠偏、断带抓捕器
- 主营：煤场皮带秤、皮带秤、螺旋秤、失重秤、转子秤、电子皮带秤、ICS皮带秤、配料秤、调速皮带秤、计量秤、粉料失重秤、失重秤喂料机、粉煤灰转子秤、颗粒皮带秤、粉料螺旋秤、螺旋称重给料、螺旋铰刀秤、螺旋计量给料机、密封皮带秤、配料计量秤、定量给料机、粉料定量给料机
- 主营：斗式提升机、粉尘加湿机、刮板输送机、螺旋输送机、星型卸料器、通风蝶阀、插板阀
- 主营：计量设备、称重设备、定量给料机、计量秤、螺旋秤、皮带秤、配料秤、减重秤、包装秤、失重秤、煤粉秤、电子皮带秤、电子螺旋秤、定量包装秤、吨包秤、吨袋包装机
- 主营：不锈钢储罐、陶瓷过滤机、冷凝水回收装置、螺旋秤、玻璃钢罐、冷凝器、离心机、压滤机
- 主营：定量给料机、磁选机、金属探测仪、皮带秤、螺旋计量秤、微粉秤、转子计量秤、链板秤、转子秤、链板计量秤、螺旋秤、除铁器、强磁磁选设备、搅拌机、金属探测器、尾矿打捞机、管链输送机、刮板输送机、化浆机、金属分离器、全自动金属分离器、双轴搅拌机、工业搅拌机、泥浆搅拌机、双轴加湿搅拌机
- 主营：排设备、干排筛、水洗砂、变频螺旋输送机、捞砂机、分离机、振动筛、脱水机、输送机、筛石头、泥石土、回收机、洗砂机、石头槽、洗沙机、脱水斗、气流筛、板链斗、水洗沙、石英粉、石英砂、提升机、链板机、摇摆筛、输送量、滚轴筛
- 主营：除铁器、输送机、吨包机、失重秤、皮带秤、电子皮带秤、螺旋秤、链板秤、振动给料机、皮带输送机、提升机、配煤机、包装机、拆包机、充填站、码垛、涡电流分选机、打散机、生产线、金属检测机
- 主营：提升机、给料机、上料机、水平螺旋机、关风机、除尘器、锁风阀、输送机、集尘设备、除尘设备、垂直提料机、脉冲吸尘器、方口卸料阀、砂浆搅拌机、加湿搅拌机、板链输灰机、ls绞龙输灰机、双板链斗提机、粉尘收集设备、锅炉粉尘收集器、脉冲滤芯集尘器、脉冲布袋集尘器
- 主营：撇水器、尼龙耙、粗格栅、除砂机、上料机、捞杂机、栏污机、石灰乳、捞砂机、清污机、分离机、撇油机、刮泥机、水装置、输送机、配药机、滗水器、吸泥机、细格栅、活性炭、排泥机、桶格栅、301配件、离心机、拦污栅
- 主营：除尘器、FU型刮板机、斗式提升机、螺旋输送机、加湿搅拌机、星型卸料器、旋风分离器、插板阀、通风蝶阀
- 主营：定量给料机、带式称重喂料机、除铁器、螺旋输送机、螺旋秤、皮带秤、失重秤、链板秤、振动给料机、皮带输送机、提升机、配煤机、拆包机、充填、涡电流分选机、破碎阀、生产线、金属检测机