QXG200 Drive Chain

Hangzhou Ocean Industry Co., Ltd. is one of the most experienced manufacturers and suppliers of qxg200 drive chain in China. Welcome to wholesale customized qxg200 drive chain at competitive price from our factory. Good service and quality products are available.

 

 

The QXG200 drive chain functions as the primary traction and power-transmission element within enclosed-track overhead conveyor installations. Engineered around a 200-millimetre link pitch, this chain bridges the gap between lightweight handling systems and heavy-duty industrial lines, making it the most widely deployed pitch class in powder coating, electroplating, and general assembly applications worldwide.

Unlike lighter variants that prioritize speed over load, the QXG200 drive chain allocates more cross-sectional material to each forged link plate, raising the allowable working tension to 40 kN (standard grade) and up to 55 kN (extra-heavy grade). This headroom lets a single continuous loop carry mixed-load populations - for example, lightweight skids in drying zones and heavier fixtures in dip-tank zones - without segmenting the line or installing intermediate drives.

Every link incorporates factory-sealed rolling elements that eliminate the need for routine lubrication access, a critical advantage in contamination-sensitive environments such as food-grade processing or Class 10000 cleanroom assembly. The sealed-bearing architecture also reduces audible noise to below 62 dB(A) at nominal conveying speed, supporting compliance with workplace sound exposure limits.

As a painting line chain QXG200 conveyor chain product, it withstands sustained oven temperatures up to 250 °C (HA grade) without lubricant degradation or dimensional drift, while its drop-forged 40Cr link plates maintain HRC 38-46 hardness across the pin-hole and wheel-contact zones after millions of articulation cycles.

 

 

Selecting the correct drive engagement method is essential for transmitting torque efficiently and preventing premature chain wear. The table below maps each drive architecture to its recommended QXG200 variant and explains the engineering rationale behind the pairing.

Drive Architecture	Engagement Method	Recommended Variant	Engineering Rationale
Caterpillar (Cat) Drive	Drive dogs grip link plates	QXG200-S / QXG200-HH	Distributed contact across multiple link plates reduces point loading; ideal for long straight runs with moderate accumulation
Sprocket Drive	Teeth engage pin/bushing gaps	QXG200-S	Precise tooth-pitch matching at 200 mm ensures smooth engagement; best for short loops with frequent start-stop cycles
Friction Wheel Drive	Rubber/polyurethane wheel bears on chain back	QXG200-S	Lowest impact engagement; suitable for light loads under 50 kg per point and clean-environment applications
Tangential Drive	Drive chain meshes with conveyor chain via tangential sprocket	QXG200-HH / QXG200-HA	Handles high cumulative tension in multi-drive loops; HA grade recommended when total loop tension exceeds 45 kN

When specifying a painting line chain QXG200 conveyor chain installation, the caterpillar drive remains the industry default because it distributes engagement force across 4-6 link plates simultaneously, minimizing concentrated stress at any single pin joint.

 

Properly sizing a QXG200 drive chain loop requires accounting for track geometry, load distribution, thermal expansion, and wear allowance. The following planning steps ensure the installed chain operates within its design envelope from day one.

Step 1 - Measure the Track Centre-Line Length

Walk the entire conveyor path and sum the straight-section lengths plus the arc lengths of every horizontal curve and vertical bend. For horizontal curves, arc length = turning radius × bend angle (radians). For vertical bends, use the same formula with the vertical bending radius. Add 2 % to the total as a routing tolerance allowance.

Step 2 - Convert to Link Count

Divide the adjusted centre-line length by the 200 mm pitch. Round up to the next even number to ensure the chain ends meet with correct pin orientation. An odd link count forces the use of an offset link, which reduces tensile capacity by approximately 15 % and should be avoided in load-carrying loops.

Step 3 - Calculate Suspension Spacing

Fixture suspension points must be spaced at whole-number multiples of the 200 mm pitch. The formula is: Suspension Spacing = 200 + (200 × N), where N = 0, 1, 2, 3... For a typical 800 mm fixture spacing, N = 3 (200 + 600 = 800). Ensure that the chosen spacing distributes loads evenly and does not concentrate weight near drive or take-up stations.

Step 4 - Add Take-Up Allowance

Reserve 1.5 – 2 % of total chain length as take-up travel. For a 200-metre loop, this means 3 – 4 metres of adjustment range. The take-up station should be positioned at the return side, as far from the drive as possible, to maintain consistent tension across the loaded span.

 

 

A properly tensioned QXG200 drive chain is invisible to operators - it runs quietly, tracks straight, and requires no intervention. Understanding the tension lifecycle helps maintenance teams predict replacement windows and avoid unplanned stoppages.

Initial Tension Setting

Set the take-up so that chain sag at the midpoint of the longest unsupported return span equals 2 – 3 % of the span length. For a 10-metre return span, this means 200 – 300 mm of visible sag. Over-tensioning accelerates bearing wear and increases drive motor current draw by 8 – 15 %; under-tensioning causes chain skip at the drive and erratic load positioning.

Wear-Induced Elongation Curve

QXG200 chains typically elongate 0.5 – 0.8 % during the first 500 hours as bearing surfaces seat and pin-bushing interfaces bed in. This "break-in" elongation is normal and absorbed by the take-up. After break-in, elongation proceeds at roughly 0.1 – 0.2 % per 1,000 operating hours under rated load.

Replacement Threshold

Replace the chain when total elongation reaches 2.5 % of nominal length. At this point, pin-hole wear compromises drive engagement geometry. For a 200-metre loop, the 2.5 % threshold corresponds to approximately 5 metres of cumulative elongation - verified by measuring a fixed 10-pitch (2,000 mm) section.

Thermal Expansion Compensation

In oven zones, a 200-metre steel chain expands by approximately 22 mm per 100 °C temperature rise. The take-up must accommodate this without bottoming out. For installations with 200 °C oven passages, reserve a minimum of 50 mm of additional take-up travel beyond the wear allowance.

 

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