SPRING-TYPE CABLE REELING DRUM (With Electrical Slipring Assembly)
Spring-type cable reeling drums (CRD) use pre-tensioned spiral springs for automatic cable retraction. They are widely used for moving machinery requiring mobile electrical power, including small cranes, hoists, conveyors, material handling equipment, and shop floors.
🧱 Construction
Spring-type cable reeling drums are built with a compact, mechanically-driven recoil mechanism and an integrated electrical slipring assembly.
► Main Components
Spring Barrel / Drum Body
Heavy-gauge welded steel drum housing the spiral spring.Spiral Spring / Flat Steel Spring
Cold-rolled, high-tensile spring steel wound inside the spring chamber, providing rewind torque.Cable Reel Drum
The rotating drum around which cable winds uniformly.Electrical Slipring Assembly
Located at drum axis, enabling uninterrupted electrical transmission during rotation.
Includes:Copper or bronze rings
High-pressure carbon brushes
Insulated support structure
Outboard Flanges
Prevent cable spillage and guide the cable path.Torque Adjuster
Allows setting recoil force depending on cable weight and length.Mounting Base
Rigid fabricated steel base for fixed or swivel mounting.
► Slipring Design in Spring Cable Reels
Copper rings for low-resistance power transmission
Multi-pole rings for power + control signals
Encapsulated or IP-rated housing
Brush holders with constant-pressure springs
Designed for slow rotational speeds (due to spring-driven operation)
📦 Space Management
Spring cable reeling drums are designed for compact installations:
Small footprint for mounting on machinery frames, trolleys, or walls
Low height and width variations depending on cable capacity
Slipring is fully enclosed inside the drum hub → no external protrusion
Suitable for retrofitting in tight industrial spaces
Their design ensures minimal spatial obstruction while safely managing cable retraction.
⚙️ Applications
Spring-type cable reeling drums are used for:
Material handling equipment
EOT crane pendant systems
Monorails
Jib cranes
Lifting tables
Warehouse and shop floor equipment
Mobile lighting towers
Portable power tools
Electric towing vehicles
Automation & robotic lines
Packaging machinery
These applications require flexible, self-retracting power supply for moving devices.
🛠️ Engineering Considerations
Proper spring torque selection is critical to ensure smooth cable recoil
Slipring must match:
Current rating
Voltage
Duty cycle
Drum dimensions designed based on cable diameter, bend radius, and travel length
Cable guide rollers may be added to prevent abrasion
Balanced spring tension eliminates jerks during extension/retraction
Slipring brushes must be accessible and replaceable
The combination of spring force and slipring technology provides safe and reliable electrical supply in dynamic applications.
SPRING-TYPE HOSE REELING DRUM (With Rotating Swivel Joint)
Spring-type hose reels are engineered for fluid transfer—air, water, gas, oil, grease, coolant, chemicals—using a spring-driven rewind system and a rotary swivel joint instead of a slipring.
🧱 Construction
Spring hose reeling drums consist of:
► Drum Body
Heavy-duty steel or stainless steel drum
Designed for flexible hoses rather than electrical cables
Hose channel designed to prevent kinking and flattening
► Spiral Recoil Spring
Similar to cable reels but sized for heavier hose loads
High-strength spring steel delivering uniform rewind torque
► Rotary Swivel Joint (Fluid Rotary Union)
The key difference from cable reels:
Instead of sliprings, hose reels use a rotating swivel joint, enabling continuous fluid flow while the drum rotates.
Swivel Joint Construction
Precision-machined steel or stainless steel
Multi-lip seals for air/water/gas/oil compatibility
Hardened shaft with O-rings or mechanical seals
Bearing-supported rotary union
Available in single-line or multi-line configurations (for multiple fluids)
► Hose Guide & Support Rollers
Ensures hose winds evenly and avoids twisting.
► Mounting Frame
Fabricated steel frame
Allows floor, ceiling, or wall mounting
Optional pivoting base for hose approach flexibility
📦 Space Management
Spring hose reeling drums must accommodate:
Larger drum diameter and width due to hose thickness
Swivel joint positioning at the drum axis
Optional guide arms for proper hose alignment
Despite hose size requirements, they remain compact for industrial settings.
Often used in:
Workshops
Service bays
Maintenance pits
Vehicle-mounted systems
Outdoor service stations
⚙️ Applications
Spring hose reeling drums are used for:
Compressed air systems (industrial and automotive)
Water supply lines
Grease lubrication lines
Fuel and diesel dispensing
Chemical dosing
Pneumatic tools and machinery
Welding and cutting gas lines
Firefighting hose reels
The swivel joint ensures uninterrupted flow during hose retraction or extension.
🛠️ Engineering Considerations
Swivel joint sealing material must match fluid:
Viton / Nitrile for oils
PTFE for chemicals
EPDM for water
Internal passageways sized for required flow and pressure
Spring torque must account for hose weight plus fluid weight
Hose bend radius must follow manufacturer's standards
Anti-kink guides and adjustable rollers ensure hose longevity
Structural integrity essential for high-pressure lines
Hose reeling drums are engineered to ensure reliable fluid transfer with minimal leakage or pressure loss.
