The double strand roller chain conveyor belt utilizes two synchronized roller chains positioned at the outer edges, tied together with rigid cross-rods that support various mesh or slat configurations, ensuring positive drive engagement, precise tracking, and high tensile strength under heavy industrial loads.
Construction & Drive Architecture
Dual-Strand Synchronization: Two matched roller chains run on opposite sides, preventing lateral drift and maintaining strict alignment across wide spans.
Precision Pin-and-Bushing Design: Ground pins and bushings minimize internal friction, reducing wear elongation during continuous high-load cycles.
Cross-Rod Integration: Rods pass through or weld securely to chain links, transferring drive force directly from sprockets to the carrying surface.
Positive Engagement Drive: Sprockets mesh directly with chain links, eliminating belt slippage and enabling reversible, timed operation.
Technical Specifications
|
Parameter Category |
Specification Details |
|
Belt Width Range |
300 mm – 2500 mm |
|
Roller Chain Pitch |
25.4 mm – 50.8 mm |
|
Cross-Rod Diameter |
6 mm – 16 mm |
|
Max Operating Temp |
Up to 1150°C |
|
Tensile Strength |
Up to 180 kN |
|
Conveying Speed |
Up to 15 m/min |
Core Performance Features
Zero Slippage Drive:
Exact synchronization between drive motors and belt movement for indexing and timed processing lines.
High Load Capacity:
Load distributed across dual strands and heavy cross-rods, supporting multi-ton payloads.
Thermal Expansion Allowance:
Free-floating cross-rod design permits transverse thermal expansion without side chain binding.
Rigid Tracking Stability:
Edge-driven chains run securely within fixed guide tracks to prevent wandering during long runs.
Material & Metallurgy Options
Austenitic Stainless Steel (AISI 304 / 316): Standard for food processing, washing, and corrosive environments up to 700°C.
Heat-Resistant Alloys (AISI 314 / Inconel 600 / 601): Deployed in brazing, sintering, and annealing furnaces above 800°C.
Hardened Carbon Steel (C45 / 40Cr): Applied in heavy stamping transfer lines and non-corrosive ambient setups.
Thermal Treatments: Solution annealing relieves internal drawing stresses; shot peening increases fatigue resistance.
Load Management & Friction Control
Supports up to 120 kg/m² when cross-rods and mesh density match product weight.
Individual cross-rod deflection kept below L/500 under maximum point loading.
Roller-to-track rolling replaces sliding friction, cutting power consumption by 35%.
Belt & Sprocket Matching Guidelines
Minimum Tooth Count: At least 10 teeth recommended for smooth chordal action and reduced wear pulsation.
Sprocket Hardness: Hardened to HRC 38–45 to match chain roller hardness and prevent premature tooth wear.
Shaft Parallelism: Drive and idle shafts must align within 0.5 mm per 1000 mm span.
Keyway Synchronization: Dual drive sprockets keyed to a common shaft to prevent phase lag between strands.
Industrial Applications
Thermal Processing Furnaces: Controlled atmosphere brazing, powder metal sintering, copper brazing, and glass annealing lehrs.
Heavy Component Manufacturing: Automotive stamping transfer, rough machining chip removal, and heavy casting cooling.
Surface Treatment Systems: Industrial parts washers, continuous degreasing units, quench tanks, and paint drying ovens.
Food Processing: High-capacity blanching tanks, continuous baking ovens, and heavy vegetable washing lines.
Engineering Selection Guide
Define Thermal Parameters: Identify peak operating temperatures, chemical exposure, and thermal cycling frequency.
Calculate Load & Tension: Determine total product weight, friction coefficients, and safety factors (minimum 8:1 for elevated temperatures).
Determine Drive Geometry: Specify chain pitch, pulley diameters, take-up travel, and motor torque constraints.
Select Surface Overlay: Choose open area percentages for airflow or solid slats to prevent small part drop-through.
Custom Engineering Options
Non-Standard Ratios:
Tailored chain pitch and belt widths engineered to fit existing conveyor frames.
Special Flight Attachments:
Factory-welded vertical flights, retaining lips, or compartmentalized dividers for inclined transport.
Extended Pins:
Custom pin lengths and hole drillings for secondary fixture mounting.
Frequently Asked Questions
Q: What causes premature chain elongation at high temperatures?
A: Chain elongation stems from thermal creep and micro-wear between pins and bushings. Selecting heat-resistant alloys like AISI 314 or Inconel and applying proper lubrication mitigates this wear.
Q: How is thermal expansion handled across wide belts?
A: Cross-rods feature lateral clearance inside outer chain links, allowing the mesh or slats to expand transversely without bowing the side chains.
Q: Can damaged chain sections be replaced independently?
A: Yes. Belts built with cottered roller chains allow technicians to remove cotter pins, extract damaged links, and install replacement segments without replacing the entire belt.
Q: What is the standard lead time for custom roller chain belts?
A: Production schedules depend on alloy availability and specification complexity, typically ranging from 15 to 25 business days following drawing approval.
Q: Do roller chain belts require continuous lubrication?
A: Ambient applications require regular oil lubrication. High-temperature applications above 350°C require dry lubricants like colloidal graphite to prevent carbon residue buildup.
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