NR Type Electric Wire Rope Hoist

The NR type electric wire rope hoist is a heavy-duty lifting machine widely used for material handling in factories, warehouses and industrial plants. Designed for capacities from 1 ton up to 80 tons, this hoist meets rigorous international standards for quality and safety. It is CE-certified and built for reliability and efficiency in demanding environments. Typical applications include foundries, metallurgy, shipbuilding, automotive, coal and petrochemical plants. The NR hoist is often mounted on an overhead or gantry crane beam, supplying lift power via its electric motor and gear mechanism. Major parts include the electric motor, gear reducer, lifting drum, wire rope, hook block and integrated control cabinet. A robust frame and modular design ensure durability and ease of maintenance.

Technical Standards and Design

The NR hoist is a "new generation" design developed through extensive R&D. It is built in accordance with international crane standards. Standard work duty is rated at FEM 2M (ISO M5), with higher duty classes available for very frequent or heavy service. Its steel structure and components are precision-engineered: for example, the wire rope is high-strength alloy (grade 2160) and the hook is a forged T-class hook. All electrical parts (motors, brakes, controls) are rated for long life and tested under national safety protocols.

The NR series comes in four main configurations:

• NRL (Low-Headroom Monorail) – for 3, 5, 10 ton lifts where headroom is limited.

• NRS (Standard Monorail) – the general-purpose hoist for 3–80 ton capacity.

• NRT (Double-Rail Trolley) – for crab-style travel on double rails, ideal for multi-hook or heavy-girder cranes.

• NRF (Foot-Mounted) – a stationary hoist base for floor or foundation mounting.

Each design shares common standards and features but can be chosen to match the crane type and installation constraints.

Key Components

Key components of the NR hoist include the hoisting motor, gear reducer, large-diameter steel drum, high-strength steel wire rope, and the hook block with integrated latch. The hoisting motor is a heavy-duty gear motor (dual-speed or inverter-driven) whose shaft connects directly to a hardened-gear reducer. The reducer's gears are made of case-hardened alloy steel (20CrMnTi) for long wear. An electromagnetic disc brake is mounted on the motor/reducer to hold the load securely when lowering. The drum winds the wire rope, which is anchored internally and guided by pulleys. The forged T-class hook at the rope's end is rated for the hoist's full capacity.

All controls (start/stop, speed control, limit switches) are housed in a compact electrical cabinet (sometimes called an "integrated controller") attached to the hoist. This controller includes safety and monitoring electronics, such as overload relays and fault displays, to protect the machinery. The hoist's modular design means that motors, drums, wheels and other subassemblies are interchangeable.

Product Features

• Intelligent Safety Monitoring: The NR hoist is equipped with smart diagnostics and protection. An onboard controller tracks usage cycles and operating hours, and it monitors each lift for overload conditions. If the load exceeds capacity, the system will halt lifting to prevent damage. It also records data (total load tonnage, brake operations, motor starts) and can transmit this to a maintenance center for predictive service.

• Advanced Motion Control: Electronic features ensure precise and safe load handling. A built-in anti-sway control system automatically damps load oscillation, allowing the crane to position loads more quickly and accurately. Special speed modes (such as zero-speed or dead-slow creep at the end of travel) let the operator approach the final position very slowly for exact placement. These functions improve productivity and reduce load swing without extra operator effort.

• Compact, Low-Headroom Design: All models use large-diameter drums and a narrow body to maximize lifting height and minimize the hook's distance to the beam. As a result, the hoist takes up minimal overhead clearance. In practical terms, this means you get more usable lift height under a given crane setup. The compact profile also reduces the space on each side of the crane, effectively extending the crane's working area.

• Modular Construction: The NR series is built from standardized modules. Motors, pulleys, wheels and drums are designed as interchangeable units. This modularity allows Yuantai to tailor configurations easily (different motors, drum widths, trolley assemblies) and simplifies maintenance. For example, wheels and motors come in multiple types so that a single spare part can fit several hoist sizes.

• Rugged Durability: Components are rated for industrial use. The entire hoist is tested under a 1,600-hour life test, and electrical parts (contactors, sensors, etc.) are rated for at least 500,000 starts. Brake systems are proven for a million cycles. The wire rope is steel grade 2160, giving a high breaking force, and the hook is made of high-strength alloy (T-class). Together, these features mean the NR hoist can run reliably under heavy duty for many years.

• High Precision and Efficiency: The motors are high-quality, dual-speed or variable-frequency types, achieving smooth acceleration. This yields efficient operation (energy-saving motors, optimized gearboxes) and very low noise in use. Yuantai's configuration ensures that control is precise (as needed for delicate loads) without sacrificing lifting speed when moving lighter loads or when time is critical.

Usage Precautions

• Respect Rated Capacity: Never exceed the hoist's load rating. The NR hoist includes built-in overload protection that will stop lifting if a load is too heavy. Always verify the hook block and rigging (slings, chains) are sized appropriately for the load.

• Pre-Use Inspection: Before each shift, check that the hook latch is working, the wire rope is undamaged, and all limit switches and emergency stops function. Look for signs of wear, corrosion, or any deformation.

• Proper Operation: Only trained personnel should operate the hoist. Always lift loads with the hook centered and balanced. Do not allow people to ride on the load or use the crane as a personnel lift. Maintain safe speed and avoid sudden starts/stops that could jerk the load.

• Environmental Conditions: Use the hoist within its specified ambient range (typically −20°C to 40°C) and avoid corrosive or extremely dusty environments unless the hoist is specially protected. Keep the hoist and trolley clean and free of debris.

• Safety Devices: Test the end-of-travel and height-limit switches regularly. Never bypass safety interlocks or remove guards. If any fault indicator appears on the hoist's controller, shut down and investigate before resuming work.

Selection Guidelines

When choosing an NR electric hoist model, consider the following factors:

• Load Capacity and Duty: Select a hoist with a rated capacity above your maximum load. For frequent or continuous operations, consider a higher crane duty class (M5–M7). The NR series covers 1–80 tons, so pick the model nearest your needs.

• Required Lift Height and Headroom: Determine the maximum lift height. All NR hoists are designed to maximize lift (large drum), but if overhead clearance is tight, the NRL (low-headroom) variant is optimal. Check the headroom dimensions (hook to beam) for each model.

• Mounting and Trolley Type: Decide how the hoist will be installed. Use an NRL/NRS for rail-mounted hoisting. Use NRT (crab trolley) if the hoist must travel on fixed rails for loading across a bay. Choose NRF (floor-mounted) if the hoist is to be used without crane rails (rare for wire rope type).

• Speed Requirements: The NR hoist can be supplied with single- or dual-speed hoisting motors, or with variable-frequency drives for seamless speed control. Higher-capacity models often use multi-reeving drums (8/2 or 16/2 falls) that give lower speeds (for example, an 80t hoist might lift at ~0.4–2.5 m/min). Ensure the lift and travel speeds match your production needs.

• Special Conditions: If the hoist will operate outdoors or in a corrosive environment, choose the weatherproof version (sealed enclosures and special coatings). For flammable or explosive atmospheres, specify an. Other options include insulation for cold climates or stainless steel parts for hygiene applications.

• Controls and Power Supply: Select the control interface (pendant control is standard; radio remote or operator cabin are optional) and verify the power supply voltage. Yuantai can tailor the hoist to your control voltage (e.g. 380V 3-phase) and provide remote monitoring accessories if required.

• Attachments: If needed, Yuantai can equip the hoist with special lifting attachments (magnets, grabs, or custom hooks) and can adjust the trolley wheelbase for different crane widths.

Maintenance Practices

Regular maintenance maximizes safety and service life:

• Daily Checks: Inspect the wire rope for broken strands or kinks, check the hook latch and safety catches, and listen for any unusual noise during a test lift. Verify the brake can hold the load without slipping.

• Lubrication: Keep the wire rope and hook bearing lightly lubricated as recommended. The gear reducer is factory-filled with long-life oil; under normal duty it can run for years without change. However, if the hoist is used heavily or in hot conditions, schedule oil changes per the manual.

• Component Service: Periodically, check and clean the brake discs, and adjust the brake air gap if needed. Test and calibrate limit switches. Ensure the electrical cabinet is dry and vent-free. Fasteners should be torqued to spec. Keep dust and contaminants away from the inverter or drive unit.

• Record Keeping: Keep a log of operating hours, loads, and maintenance actions. The NR hoist's built-in monitoring system can record duty cycles and faults, aiding in predictive maintenance. Replace wear items (wire rope, brake pads, switches) as soon as they reach wear limits. Following a scheduled preventive maintenance routine will help prevent unexpected downtime.

Customization Options

The modular NR hoist platform supports many custom variants:

• Structural Customization: By mixing modules, Yuantai can create hoists for special beam widths, extended hook approaches, or multi-hook rigs. Gantry cranes can use tandem hoists synchronized on one radio control system. The integrated design means fewer bespoke parts are needed.

• Environmental Protection: Options include fully enclosed, weatherproof motors and gearboxes for outdoor use. For corrosive or wash-down environments, stainless or coated finishes are available. Hoists can be adapted for very cold or hot ambient use with suitable components.

• Explosion-Proof Configurations: Certified flameproof (Ex d) or pressurized (Ex p) versions are available for hazardous zones. These use special motors, wiring, and enclosures to meet ATEX/IECEx standards.

• Control and Drive Variants: Single-speed or multi-speed (gear ratio) motors can be chosen. Variable-frequency drives (VFDs) can be added to provide smooth speed control and soft-starts. Control interfaces can be pendant cable, wireless remote, or control cabin, with options for advanced PLC integration.

• Other Options: Color schemes and branding can be customized for corporate identity. Hoists can be shipped partially disassembled for tight installations. Any special request can usually be accommodated by the modular design.

By carefully matching the NR hoist model to the application and by following proper operation and maintenance guidelines, plant managers and engineers can ensure safe, long-term performance from this high-capacity lifting solution. Detailed technical specifications and assistance are available from Yuantai's crane experts to help you select and configure the right NR type electric wire rope hoist for your facility.

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