Metering Screw/Auger for Powder Feeders | Specifications & Verification

Product Specifications

Technical details and manufacturing context for Metering Screw/Auger

Definition

The Metering Screw/Auger is a critical component within powder feeder systems used in machinery and equipment manufacturing. It employs helical flighting to transport and precisely meter powdered materials from a hopper to a discharge point, ensuring consistent volumetric or gravimetric flow rates in industrial processes. The screw rotates within a stationary barrel or housing, creating a positive displacement action that moves powder along its length. The rotation speed, screw pitch, and flight design determine the material feed rate, allowing for precise control of powder dispensing. This component is available in materials such as stainless steel, carbon steel, and hardened alloy steel, with typical specifications including screw diameters from 100 to 300 mm, lengths from 500 to 2000 mm, pitches from 50 to 200 mm, and throughput capacities from 0.5 to 10 m³/h. Metering accuracy ranges from ±0.5% to ±1.0%, and screw speeds are adjustable from 10 to 120 rpm. Drive power typically ranges from 1.5 to 7.5 kW, operating temperatures from -20 to 60 °C, and operating pressures from 0.1 to 0.6 MPa. Material of construction often includes SS304/316 per ASTM A240, with surface finishes from Ra 0.8 to 1.6 μm per ISO 1302. Weight varies from 150 to 800 kg. These values are reference ranges and must be confirmed for the specific model and application. The component is designed for integration into powder handling systems, and its selection depends on material properties, required feed rate, and accuracy. Verification of model-specific values and standards with the legal manufacturer or supplier is essential.

Working Principle

The metering screw operates on the principle of positive displacement. As the screw rotates within a stationary barrel, the helical flights capture powder from the hopper and move it forward. The feed rate is determined by the screw's rotational speed, pitch, and flight geometry. By adjusting these parameters, the system can achieve precise volumetric or gravimetric control of powder dispensing. The screw's design ensures consistent flow, minimizing variations in dosing.

Common Materials

Stainless Steel, Carbon Steel, Hardened Alloy Steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Screw Diameter	100–300 mm	Determines throughput and particle size compatibility
Screw Length	500–2000 mm	Affects residence time and mixing
Pitch	50–200 mm	Influences feed rate and accuracy
Throughput Capacity	0.5–10 m³/h	Range for typical powder metering applications
Metering Accuracy	±0.5–±1.0 %	Critical for consistent dosing
Screw Speed	10–120 rpm	Adjustable for flow control
Drive Power	1.5–7.5 kW	Depends on material properties and capacity
Operating Temperature	-20–60 °C	Material and seal compatibility
Operating Pressure	0.1–0.6 MPa	Typical for gravity-fed systems
Material of Construction	SS304/316	Corrosion resistance and food-grade optionsASTM A240
Surface Finish	Ra 0.8–1.6 μm	Affects material flow and cleaningISO 1302
Weight	150–800 kg	Varies with size and material

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Screw Shaft Part
Central rotating element that supports the flighting

Material: Steel Alloy
Helical Flighting Part
Spiral ridges that move powder along the shaft

Material: Hardened Steel
Drive Connection Part
Interface for connecting to motor or gearbox

Material: Steel
Barrel
The fixed tube the screw turns inside; the clearance between the two is what sets the dosing accuracy.

Material: Stainless Steel

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Powder Feeder

View system integration details

Manufacturers of Metering Screw/Auger

Manufacturer profiles associated with Metering Screw/Auger.

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Frequently Asked Questions

What is the typical metering accuracy of a metering screw?

The metering accuracy typically ranges from ±0.5% to ±1.0%, depending on the screw design, material properties, and operating conditions. Confirm the exact accuracy for your specific model with the manufacturer.

Which materials are commonly used for metering screws?

Common materials include stainless steel, carbon steel, and hardened alloy steel. For corrosion resistance and food-grade applications, SS304/316 per ASTM A240 is often specified. Verify material suitability with the supplier.

How does screw speed affect the feed rate?

Screw speed directly influences the feed rate: higher speeds increase throughput, while lower speeds provide finer control. The adjustable speed range is typically 10-120 rpm, but the optimal speed depends on the material and desired accuracy.

What maintenance signals indicate a need for inspection?

Signs such as inconsistent feed rates, unusual noise, or increased wear on the flights may indicate the need for inspection. Regular checks of screw alignment, surface finish, and seal integrity are recommended. Always follow the manufacturer's maintenance guidelines.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 10 bar
flow rate:	0.1 to 5000 kg/h
temperature:	-20°C to +60°C
slurry concentration:	Up to 70% solids by weight

Metering Screw/Auger

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards