Double Hanger Bracket For Overhead Paint Conveyor Chain

Name: China Double Hanger Bracket For Overhead Paint Conveyor Chain Manufacturers Suppliers Factory - Hangzhou Ocean
Brand: Ocean
SKU: 306456141

Double hanger bracket doubles throughput on QXG overhead paint conveyor chains. Dual-point 45# steel forged bracket with carburized finish carries two workpieces per chain position for powder coating, e-coat, and wet paint lines.

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Product Introduction

Hangzhou Ocean Industry Co., Ltd. is one of the most experienced manufacturers and suppliers of double hanger bracket for overhead paint conveyor chain in China. Welcome to wholesale customized double hanger bracket for overhead paint conveyor chain at competitive price from our factory. Good service and quality products are available.

Double Hanger Bracket for Overhead Paint Conveyor Chain

In high-volume paint and powder coating lines, throughput is dictated by three variables: chain speed, hanger pitch (the centre-to-centre distance between consecutive hangers on the chain), and the number of workpieces carried per hanger position. Chain speed is constrained by spray-booth dwell times and oven cure cycles. Hanger pitch is constrained by the chain's link-plate spacing and the size of the workpieces. But the third variable - workpieces per hanger position - has headroom: switching from a single hanger to a double hanger bracket instantly doubles the number of parts processed per chain revolution without increasing chain speed, extending track length, or adding additional chain links. This is the productivity lever that the double hanger bracket provides.

The double hanger bracket (also called a dual-point hanging bracket, Y-type twin hanger, double drop rod carrier, or two-position workpiece suspension frame) is a forged or fabricated steel component that bolts directly to the conveyor chain's link plates and provides two independent attachment points for workpiece hooks, cross bars, or custom fixture jigs. The bracket's two hanging positions are separated by a minimum centre distance - typically 150–300 mm depending on the chain series - that prevents adjacent workpieces from contacting, rotating, or interfering with each other as the chain negotiates horizontal and vertical curves. The two positions are symmetrical about the chain centreline to maintain balanced loading and prevent asymmetrical wear on the guide wheels and track.

For paint and coating lines specifically, the double hanger bracket must satisfy a set of demands that go beyond simple structural load carrying. It must maintain reliable electrical grounding continuity from the chain through the bracket to both workpieces - an ungrounded workpiece will not attract charged powder in an electrostatic spray booth, resulting in an uncoated reject. The bracket's geometry must minimise the "shadow effect" where the bracket itself blocks spray from reaching the workpiece surface directly behind it. Joints and threaded connections must resist oven temperatures of up to 250 °C without loosening from thermal cycling. And the bracket must be designed for rapid workpiece changeover - operators loading and unloading on a continuously moving line need a bracket that accepts and releases workpieces quickly without tools, jams, or pinch hazards.

Double Hanger Configurations

Double hanger brackets are available in several geometric configurations, each optimised for specific workpiece profiles and coating-line layouts. The following configurations are standard across all QXG chain series:

Configuration	Description & Best Applications
Y-Type Double Hanger	Two drop rods or hook points extend downward and outward from a central mounting boss at angles of 15–45° from vertical. The Y geometry separates the two workpieces laterally, creating clearance for rotation and ensuring both faces of each workpiece receive direct spray coverage. Best for: small to medium stamped metal parts, brackets, housings, and components up to 15 kg per point on QXG200/206 systems.
Parallel Twin Hanger	Two vertical drop rods extend straight down from the chain level, parallel to each other and spaced at the centre distance determined by the chain's link-plate width. This configuration provides maximum workpiece separation in the plane perpendicular to chain travel. Best for: long parts hung vertically (exhaust pipes, trim strips, tubing), where the vertical hanging orientation is required for even coating thickness.
Cross-Bar Type Hanger	A horizontal cross bar extends outward from the chain link on one side, with two or more hanging points distributed along the bar. The cross bar offsets the workpieces to one side of the chain, useful when only one side of the chain is accessible for loading/unloading or when the booth's spray envelope is asymmetric. Best for: asymmetric loading stations where operators load from one side only, or booths with wall-mounted reciprocators targeting one chain side.
Cross Disc Type with Integrated Oil Shield	A cross bar with a circular disc stamped on the top surface, directly above the two hanging points. The disc catches any oil dripping from the chain's guide wheels or link plates before it reaches the workpieces below - an integrated contamination guard that eliminates the need for a separate oil catch plate at the hanger position. Best for: high-value finishing operations (automotive clear-coat, Class-A surfaces) where even a single oil speck is a reject defect.

Design & Construction

The double hanger bracket is manufactured from alloy steel using a combination of hot-forging, CNC machining, and surface treatment processes. Its construction reflects the simultaneous demands of structural load bearing, electrical conductivity, thermal stability, and spray-access geometry:

Material & Manufacturing Process

Construction Feature	Specification
Base Material	45# medium-carbon steel (C 0.42–0.50%); selected for balance of strength, fatigue resistance, and forgeability
Manufacturing Process	Hot-forged from bar stock to near-net shape; critical attachment eyes and mounting faces finish-machined by CNC for dimensional accuracy
Heat Treatment	Carburised and quenched to 0.8–1.2 mm case depth; surface hardness 58–62 HRC; core hardness 30–40 HRC for ductility under impact loading
Surface Finish (Standard)	Black oxide coating with anti-rust oil; provides moderate corrosion resistance suitable for indoor painting lines
Surface Finish (Optional)	Electroless nickel plating (ENP) - uniform nickel-phosphorus coating with 400+ hours salt-spray resistance; recommended for e-coat lines and humid environments
Surface Finish (Optional)	Zinc plating with yellow chromate passivation - bright finish for visible-quality requirements; 200+ hours salt-spray resistance
Mounting Boss Geometry	Machined flat face with two M10 or M12 through-holes matching the chain link-plate bolt pattern; boss thickness 8–12 mm depending on chain series
Drop Rods / Hanging Arms	Forged integral with mounting boss (one-piece construction) for maximum fatigue strength at the boss-to-arm transition; arm diameter 12–16 mm
Workpiece Attachment Ends	Threaded M10–M12 stud (for nut-secured hook attachment), or Ø15–20 mm plain eye (for hook-and-pin attachment); chamfered entry for rapid operator loading

Electrical Grounding Design

In electrostatic powder coating and liquid painting, reliable grounding of the workpiece is essential for transfer efficiency and coating uniformity. The double hanger bracket is designed with an uninterrupted conductive path from the chain link plate (which is grounded through the guide wheels, track, and conveyor support structure) through the bracket's forged body to both workpiece attachment points. Critical design elements include: (1) bare-metal contact faces at the chain-mounting boss with no paint, oxide, or coating between the boss and the chain link plate; (2) one-piece forged construction - no welded joints that would introduce resistance or fatigue-fracture points; (3) masking of the workpiece attachment ends during surface treatment plating or oxide coating to preserve bare-metal conductivity at the hook contact point. For lines processing non-conductive substrates (plastics, composites), the bracket also provides a grounding path for the conductive primer that bridges the workpiece surface to the earthed conveyor system.

Spacer Pitch Options

The centre-to-centre spacing between consecutive hanger positions on the chain - the hanger pitch - is adjustable through the selection of alternating link plates. Standard spacer pitches are 300 mm, 600 mm, and 900 mm, achieved by mounting the double hanger bracket on every second, fourth, or sixth chain link respectively. The optimal pitch is determined by the workpiece envelope dimensions plus a minimum clearance of 50–100 mm between workpieces to prevent collision on curves. A double hanger at 300 mm pitch provides the maximum throughput density; a double hanger at 900 mm pitch provides maximum clearance for large or rotating workpieces. The double hanger bracket itself does not affect the pitch - it simply doubles the number of workpieces at whatever pitch the chain is configured for.

Technical Specifications

The double hanger bracket is available in chain-series-specific configurations. The following table covers the standard product range across all compatible QXG chain models:

Parameter	QXG150/200/206 Series	QXG240/250/300 Series
Compatible Chain Series	QXG150, QXG200, QXG206	QXG240, QXG250, QXG300
Max Load per Hanging Point	8 kg (QXG150); 30 kg (QXG200); 30 kg (QXG206)	50 kg (QXG240); 50 kg (QXG250); 125 kg (QXG300)
Max Total Bracket Load	16 kg (QXG150); 60 kg (QXG200/206)	100 kg (QXG240/250); 250 kg (QXG300)
Material	45# forged carbon steel	45# forged carbon steel
Surface Hardness	58–62 HRC (carburised case, 0.8–1.2 mm depth)	58–62 HRC (carburised case, 0.8–1.2 mm depth)
Core Hardness	30–40 HRC	30–40 HRC
Mounting Boss Thickness	8 mm	10–12 mm
Mounting Bolt Size	M10 × 35 mm (2 bolts per bracket)	M12 × 40 mm (2 bolts per bracket)
Bolt Grade	Grade 8.8 (standard); Grade 10.9 (optional for high-vibration)	Grade 10.9 (standard)
Drop Rod / Arm Diameter	12 mm (Y-type / parallel)	14–16 mm (Y-type / parallel / cross-bar)
Hang Point Centre Distance	150–180 mm	200–300 mm
Hang Point Drop Length (below chain)	100–300 mm (standard); custom lengths available	150–400 mm (standard); custom lengths available
Workpiece Attachment Type	M10 threaded stud or Ø15 mm plain eye	M12 threaded stud or Ø20 mm plain eye
Bracket Weight per Unit	~0.4–0.8 kg (depending on drop length)	~0.8–1.5 kg (depending on drop length)
Operating Temperature	–20 °C to +250 °C (black oxide); –20 °C to +300 °C (ENP)	–20 °C to +250 °C (black oxide); –20 °C to +300 °C (ENP)
Electrical Conductivity	Full continuity from mounting face to both hanging points; <0.1 Ω resistance under 100 g contact load	Same
Standard Spacer Pitches	300, 600, 900 mm (selectable by link spacing)	300, 600, 900 mm (selectable by link spacing)
Corrosion Resistance (Black Oxide)	Indoor use only; apply anti-rust maintenance oil monthly	Indoor use only; apply anti-rust maintenance oil monthly
Corrosion Resistance (ENP)	400+ hours neutral salt-spray (ASTM B117); outdoor-rated	400+ hours neutral salt-spray; outdoor-rated

Single vs. Double Hanger Bracket: Throughput Economics

The decision between single and double hanger brackets is fundamentally an economic one: the double hanger doubles per-chain-position throughput for an incremental hardware cost of approximately 30–50% over a single hanger. The following comparison quantifies the throughput uplift:

Comparison Factor	Single Hanger Bracket vs. Double Hanger Bracket
Parts per chain position	1 workpiece (single hanger) → 2 workpieces (double hanger) = 100% throughput increase
Hardware cost per position	Single bracket ~USD 3–8 (depending on series and finish) → Double bracket ~USD 5–12 = ~50% cost increase
Capital cost per additional part/hour	Adding a second chain loop: USD 3,000–10,000 in track, chain, drive hardware → Adding double hangers: USD 300–1,000 in bracket hardware (97% capital savings vs. second line)
Ongoing energy cost	Single chain loop with double hangers = same motor power, same oven fuel, same booth airflow as single hangers. Two parallel lines = 2× energy cost
Footprint impact	No additional floor space - same track length, same booth size, same oven capacity. Second line = 2× floor space requirement
Changeover time	Double hanger requires both hanging points loaded per cycle, doubling operator workload at the load station. Mitigation: position load station before a slow-curve section where operators have 3–5 seconds per part
Curve clearance constraint	Double hanger workpieces on the inner radius of a curve can collide if the centre distance is too small. Verify minimum clearance at the tightest curve radius before specifying double hangers

For lines processing small to medium parts (under 30 kg per piece on QXG200/206, under 50 kg on QXG250), the double hanger is almost always the correct economic choice. The only scenario where single hangers are preferred is when workpieces are too large to hang two per position without collision on curves, or when the operator load station cannot sustain the doubled loading rate.

FAQ

Q: 1: Are you trading company or manufacturer ?

A: We are factory.

Q: 2: Can I mix single and double hanger brackets on the same chain?

A:Yes. Mixing single and double hanger brackets on the same chain is a common and recommended practice when not every position on the chain can accommodate two workpieces. For example, on a line that processes two different part numbers, the smaller part can be hung from double hanger brackets and the larger part from single hanger brackets at alternating link positions. The only constraint is that the total load on the chain must not exceed the chain's rated capacity at any point. When mixing, mark the chain links with coloured cable ties or paint dots so operators at the load station can visually identify which positions take double hangers (two parts) and which take single hangers (one part).

Q: 3. The double hanger bracket is black oxide. Will it rust in my powder coating oven?

A: Black oxide (also called bluing or blackening) is a conversion coating that provides moderate corrosion resistance under indoor conditions but is not a barrier coating. In a powder coating oven at 180–200 °C, the black oxide finish is thermally stable and will not degrade, peel, or emit fumes. However, if the line also has a wet pre-treatment wash stage (alkaline spray wash or immersion), the combination of moisture and residual alkaline chemical can cause surface rust on black oxide brackets over time. For lines with wet pre-treatment stages, specify the ENP (electroless nickel plating) finish - it provides a true barrier layer with 400+ hours of salt-spray resistance and withstands both alkaline wash and oven temperatures. The cost premium for ENP over black oxide is approximately 15–20%.

Q: 4: What hanger pitch should I use for my parts?

A: Calculate the minimum pitch as follows: measure your workpiece's length in the direction of chain travel when hung from the bracket. Add a clearance allowance of 50 mm for straight track sections, and 100 mm if the chain passes through horizontal curves of radius 800 mm or tighter (curves reduce the effective clearance because workpieces lean inward). The result is the minimum centre-to-centre distance between hanger positions. Round up to the next available pitch option: 300 mm, 600 mm, or 900 mm. Example: a 250 mm long part + 100 mm curve clearance = 350 mm minimum, so specify 600 mm pitch. If your calculated minimum falls just above 600 mm (e.g. 620 mm), specify 900 mm pitch - the curve clearance at 600 mm will be too tight and parts will collide.

Q: 5.Can I use the double hanger bracket on an XT series heavy-duty chain?

A: The standard double hanger bracket's mounting boss is machined to match the QXG chain series link-plate bolt pattern (72 × 68 mm or 80 × 80 mm enclosed track). XT series chains (XT80/XT100/XT160) have a different link-plate geometry and bolt pattern, and the standard QXG bracket will not mount to XT chain plates without modification. Custom double hanger brackets for XT chains are available on request - provide the XT chain model, link-plate drawing, and required load capacity per point, and our engineering team will provide a custom quotation with a 4–5 week lead time. The forged bracket design is scalable to XT load capacities (up to 500 kg per point on XT160).

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