Discharge Screw/Extractor: Capacity 0.1-100 m³/h

Component Specifications

Definition

A discharge screw/extractor is a precision-engineered helical screw mechanism integrated into discharge systems of industrial machinery. It consists of a rotating screw (auger) within a stationary housing or tube, designed to move granular, powdered, or viscous materials from a storage vessel (like a hopper or silo) to downstream processes. Key functions include controlled material extraction, flow regulation, and prevention of bridging or ratholing in bulk storage. Variations include single-flight, double-flight, tapered, and variable-pitch designs to optimize performance for specific materials and flow rates.

Working Principle

The discharge screw/extractor operates on the Archimedes' screw principle. As the screw rotates, its helical flights create a series of moving pockets that push material axially along the housing. The rotation is typically driven by an electric motor via a gear reducer, with speed control to adjust discharge rates. In discharge systems, it often interfaces with hopper outlets, using agitation or vibration to ensure consistent material flow into the screw intake, preventing blockages and ensuring uniform extraction.

Materials

Common materials include carbon steel (e.g., AISI 1045) for general use, stainless steel (e.g., AISI 304 or 316) for food, chemical, or corrosive environments, and hardened alloys for abrasive materials. Coatings like tungsten carbide or polymer linings may be applied to reduce wear. Screw flights are often machined or welded, with surface finishes tailored to material flow properties (e.g., polished for sticky substances).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Pitch	0.5-1.5 times diameter
Length	0.5-10 m
Capacity	0.1-100 m³/h
Rotation Speed	10-200 RPM
Screw Diameter	50-500 mm
Inlet/Outlet Size	DN80-DN400
Power Requirement	0.5-50 kW

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 2148, DIN 15262

Parent Products

This component is used in the following industrial products

Discharge System

A mechanical system for controlled removal of reduced iron (DRI/HBI) from the bottom of a direct reduction shaft furnace.

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Engineering Analysis

Risks & Mitigation

Material bridging or ratholing leading to flow stoppage
Screw wear from abrasive materials
Overloading motor due to blockages
Contamination from material degradation

FMEA Triads

Trigger: Excessive material moisture or cohesion
Failure: Bridging at screw inlet, causing no-flow condition
Mitigation: Use screw with agitation paddles, install hopper vibrators, optimize material storage conditions

Trigger: Abrasive material contact
Failure: Wear on screw flights, reducing efficiency and increasing power use
Mitigation: Select hardened materials or coatings, implement regular wear inspection schedules

Trigger: Improper screw speed or alignment
Failure: Motor overload or bearing failure
Mitigation: Install torque limiters, ensure precise alignment during installation, use variable frequency drives for speed control

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Screw diameter tolerance: ±0.5 mm; Pitch uniformity: ±1%

Test Method

Performance testing per ISO 2148 for capacity and power draw; material compatibility tests per ASTM standards

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

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Supplier transparency

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Manufacturers of Discharge Screw/Extractor

Manufacturer profiles associated with Discharge Screw/Extractor.

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Frequently Asked Questions

What is the difference between a discharge screw and a standard conveyor screw?

A discharge screw is specifically designed for extraction from storage vessels, often featuring tapered flights, variable pitch, or agitation elements to handle material flow issues like bridging, whereas standard conveyor screws focus on horizontal or inclined transport over longer distances.

How do I prevent material jamming in a discharge screw?

Ensure proper screw design (e.g., tapered or variable pitch), use appropriate rotational speeds, maintain consistent material levels in the hopper, and consider adding vibrators or flow aids. Regular inspection for wear and material buildup is also critical.

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.

Discharge Screw/Extractor