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Rotor / Screw Component – Machinery and Equipment Manufacturing

Component Specifications

Definition

The rotor/screw is the central rotating element in rotary or screw feeders, consisting of a helical flight wrapped around a central shaft. It creates positive displacement by rotating within a housing or tube, moving powdered, granular, or pelletized materials from the inlet to the discharge point with precise volumetric control. This component determines feed rate, material integrity, and system efficiency through its geometry, pitch, and rotational speed.

Working Principle

The rotor/screw operates on the Archimedes' screw principle: as it rotates, the helical flights create discrete pockets that trap and advance material axially. The controlled rotation (typically 5-60 RPM) provides consistent volumetric displacement, with feed rate adjustable via speed control. Material is pushed forward by the flight's leading edge while prevented from backflow by close clearance with the housing.

Materials

Typically carbon steel (AISI 1045/4140), stainless steel (304/316), hardened steel, or wear-resistant alloys. Surface treatments include hard chrome plating, tungsten carbide coating, or nitriding for abrasion resistance. Food/pharmaceutical applications use polished 316L stainless or FDA-approved plastics.

Technical Parameters

Pitch 0.5-1.5 times diameter
Length 300-3000 mm
Max RPM 100
Diameter 50-500 mm
Tolerance ±0.1 mm clearance
Surface Finish Ra 0.4-3.2 μm
Flight Thickness 3-20 mm
Temperature Range -40°C to 200°C

Standards

ISO 9001, DIN 15262, ISO 3408, DIN 103

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Rotor / Screw.

Parent Products

This component is used in the following industrial products

Rotary Feeder / Screw Feeder

A mechanical device that precisely meters and transfers dry bulk materials or powders from a hopper into a process stream.

View Product Details

Engineering Analysis

Risks & Mitigation

Wear from abrasive materials
Material degradation from shear
Blockage from cohesive materials
Imbalance causing vibration
Corrosion in harsh environments
Bearing failure from overload

FMEA Triads

Trigger: Abrasive material contact
Failure: Flight wear reducing feed accuracy
Mitigation: Use hardened coatings, implement wear monitoring, select appropriate clearance

Trigger: Over-torque operation
Failure: Shaft deformation or fracture
Mitigation: Install torque limiters, proper motor sizing, regular alignment checks

Trigger: Material buildup
Failure: Increased friction and motor overload
Mitigation: Implement cleaning cycles, use anti-stick coatings, maintain proper humidity control

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

Radial runout ≤ 0.1% of diameter, axial clearance 0.1-0.3 mm, concentricity within 0.05 mm

Test Method

Dimensional verification per ISO 2768, material certification, rotational balance testing (ISO 1940 G6.3), pressure testing for sealed applications

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What's the difference between a rotor and screw in feeders?

In context, 'rotor' typically refers to the entire rotating assembly in rotary valves, while 'screw' specifically describes the helical flight component. However, 'rotor/screw' is often used interchangeably for the rotating element in screw feeders.

How do I select the right rotor/screw material?

Base material selection on: 1) Material abrasiveness (hardened steel for abrasive materials), 2) Corrosion requirements (stainless for corrosive/clean environments), 3) Industry regulations (FDA/USDA for food), and 4) Temperature conditions.

What maintenance does a rotor/screw require?

Regular inspection for wear (especially flight edges), clearance checks, lubrication of bearings/shaft, cleaning to prevent material buildup, and balancing verification after repairs.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

Rotor / Screw