Feed Screw / Mechanism: Capacity Range 0.1-5000 L/h

Component Specifications

Definition

The feed screw mechanism is a critical component in metering feeders that uses a helical flight wrapped around a central shaft to transport granular, powdered, or pelletized materials from a hopper to a discharge point. It provides precise volumetric or gravimetric control of material flow rates through regulated rotational speed and screw geometry, ensuring consistent feeding for processes like batching, blending, or continuous production.

Working Principle

The feed screw operates on the Archimedes' screw principle: as the screw rotates within a stationary housing or tube, material is trapped between the flights and pushed forward axially. The volumetric displacement per revolution is determined by screw pitch, diameter, and flight design, allowing flow rate adjustment via motor speed control. In gravimetric systems, load cells measure material weight for real-time feedback control.

Materials

Typically carbon steel (AISI 1045/4140), stainless steel (304/316), or hardened alloys for wear resistance; flights may be coated with tungsten carbide, chrome, or polymers (UHMW-PE, PTFE) for specific applications.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Pitch	0.5-2 times diameter
Accuracy	±0.5-2% volumetric, ±0.1-0.5% gravimetric
Flight Type	Single/double/triple start, constant/variable pitch
Motor Power	0.1-15 kW
Speed Range	0.1-100 RPM
Capacity Range	0.1-5000 L/h
Screw Diameter	20-300 mm
Length/Diameter Ratio	5:1 to 30:1

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

Standards

ISO 3408, DIN 103

Parent Products

This component is used in the following industrial products

Metering Feeder

A precision component within the Alloy Feeder System that controls and regulates the flow rate of alloy materials into downstream processes.

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Engineering Analysis

Risks & Mitigation

Material bridging/rat-holing in hopper
Screw wear from abrasive materials
Inconsistent flow due to material compaction
Motor overload from jamming
Contamination from material degradation

FMEA Triads

Trigger: Abrasive material contact
Failure: Excessive flight wear reducing metering accuracy
Mitigation: Use hardened steel coatings, implement wear monitoring sensors, establish preventive replacement schedules

Trigger: Moisture absorption in hygroscopic materials
Failure: Material buildup and screw jamming
Mitigation: Install hopper agitation systems, use anti-stick coatings, maintain controlled environment

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Dimensional tolerance per ISO 2768-m, surface finish Ra ≤ 1.6 μm for food/pharma applications

Test Method

ISO 3408 for lead accuracy testing, ASTM E11 for sieve analysis of handled materials, in-situ calibration with certified test weights

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Feed Screw / Mechanism

Manufacturer profiles associated with Feed Screw / Mechanism.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between volumetric and gravimetric feed screws?

Volumetric screws control material by fixed displacement per revolution, while gravimetric screws incorporate weighing systems (load cells) to adjust speed based on real-time mass flow measurements for higher accuracy.

How do I select the right screw pitch for my application?

Pitch selection depends on material characteristics: fine powders require smaller pitches (0.5-1× diameter) to prevent flooding, while granular materials use standard pitches (1-1.5×). Variable pitch screws help handle cohesive materials.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Feed Screw / Mechanism