Rotor / Screw: Temperature Range -40°C to 200°C, Max RPM 100

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

Parameter	Typical range	Notes & selection driver
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

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 9001, DIN 15262, ISO 3408, DIN 103

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

Typical Suppliers & Equivalents

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

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 Rotor / Screw

Manufacturer profiles associated with Rotor / Screw.

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Shaft Bearing

Precision component supporting rotating shafts in vibration motors to reduce friction and maintain alignment.

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.

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.

Rotor / Screw