INDUSTRY COMPONENT

Choke Mechanism

A precision flow-regulating component in continuous screw presses that controls oil extraction pressure and throughput.

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Component Specifications

Definition
The choke mechanism is a critical flow-control component in continuous screw presses for oil extraction, typically consisting of an adjustable conical or tapered restriction at the discharge end. It regulates backpressure within the press barrel by creating a variable orifice, controlling material residence time, compression ratio, and final oil yield. This adjustable restriction allows operators to optimize extraction efficiency for different oilseed types and moisture contents while preventing mechanical overload.
Working Principle
Operates by creating an adjustable annular gap between a conical choke cone and the press barrel discharge housing. As the choke cone moves axially via a threaded adjustment mechanism or hydraulic actuator, the gap size changes, altering resistance to material flow. This modulates internal pressure (typically 20-100 bar) and compression force on the oilseed cake, directly affecting oil expression efficiency and residual oil content in the cake.
Materials
High-chrome alloy steel (e.g., AISI 420, D2 tool steel) with surface hardening (HRC 55-60) or tungsten carbide coatings for wear resistance. Sealing surfaces often use bronze or polymer wear rings. Fasteners: Grade 8.8 or higher corrosion-resistant steel.
Technical Parameters
  • Actuation Manual handwheel, electric, or hydraulic
  • Repeatability ±0.1 mm
  • Connection Type Flanged (ISO 6162) or threaded
  • Adjustment Range 0-50 mm
  • Temperature Range 20-150°C
  • Max Operating Pressure 120 bar
Standards
ISO 1219, DIN 24340, ISO 6162

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Choke Mechanism.

choke mechanism screw press choke oil extraction flow control press backpressure regulator adjustable restriction oilseed processing continuous press component Choke Mechanism in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Continuous Screw Press for Oil Extraction

Industrial machine for continuous mechanical extraction of oils from oilseeds and nuts.

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Engineering Analysis

Risks & Mitigation
  • Wear from abrasive materials leading to pressure loss
  • Material bridging causing flow interruption
  • Over-tightening damaging threads or cones
  • Thermal expansion affecting gap precision
FMEA Triads
Trigger: Abrasive oilseed particles
Failure: Erosion of choke cone and barrel surfaces
Mitigation: Use hardened materials or coatings; implement regular wear inspection schedules
Trigger: Improper adjustment or operator error
Failure: Excessive pressure causing mechanical failure
Mitigation: Install pressure relief valves; provide operator training; use position indicators

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.05 mm on critical sealing surfaces, ±0.2 mm on overall dimensions
Test Method
Pressure decay test at 1.5x operating pressure, material compatibility test with food-grade oils

Buyer Feedback

★★★★☆ 4.6 / 5.0 (16 reviews)

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"The technical documentation for this Choke Mechanism is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Choke Mechanism so far."

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Frequently Asked Questions

How does choke adjustment affect oil extraction efficiency?

Tighter choke settings increase backpressure, extending material residence time and improving oil yield but raising mechanical load and temperature. Optimal settings balance yield with press capacity and cake quality.

What maintenance is required for choke mechanisms?

Regular inspection for wear on sealing surfaces, lubrication of adjustment threads, cleaning of material buildup, and checking for hydraulic leaks if hydraulically actuated. Replace wear rings annually under continuous operation.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Chassis Frame Chrome Plating