Motorized Hook Block

Standard Capacity And Dimensions

The confirmed 50-tonne figure is the upper capacity of the HENDL-P027 product family, not the marked WLL of an individual block, hook or pictured unit. Rotation speed in rpm, motor rating, sheave and rope dimensions, overall block dimensions, operating temperature and duty class are not confirmed as universal fixed specifications; they are defined per project. Unlimited rotation is not available on every configuration. Powered hook rotation must not be presented as preventing rope twist in all conditions. Safety and engineered options apply only when specified and validated for a particular design; no completed testing or certification is claimed.

Working Principle

The crane hoisting system carries the load through the bottom block and hook connection. A three-phase AC-powered geared motor drives the lower hook about its vertical axis through a chain-and-sprocket transmission. The operator commands rotation by radio remote control, while an inverter allows rotation speed to be adjusted to the application. A motor brake is used to hold rotational position. Limited-angle and continuous-rotation solutions are separate variants; travel limits, power supply arrangements and cable management are engineered for the selected configuration. The crane’s hoist holding brake is a separate safety function from the powered hook-rotation brake.

Selection

Selection starts with crane rated capacity, rope diameter and number of supporting rope parts, sheave count and arrangement, hook dimensions, existing bottom-block geometry and available headroom. Load mass, centre of gravity, rotational inertia, requested turning angle, operating duty, environment and control interface also influence the design. A new bottom block, an existing-crane retrofit and a self-contained hook-on rotator are alternative implementation routes rather than standard features fitted to one unit. Steelmaking and heavy-duty overhead cranes are principal application areas.

Powered hook rotation, safety and engineered options

Depending on configuration, available safety provisions may include a motor brake, mechanical rotation stops, electrical limit switches, angular position sensing and feedback, a forged hook with safety latch, emergency-stop and crane-control interlocks, mechanical anti-rotation lock, integrated load measurement and motor-temperature monitoring. Project-engineered options can include low-headroom construction, slip-ring power transfer to a below-hook device, single or twin hooks, remote-operated hook latch, special sheave and reeving arrangements, high-temperature or corrosive-environment protection, clevis connections, and bespoke hook geometry, materials or bearings. These are not standard features of every variant and are not assumed to be mutually compatible; safety functions are engineered for the actual crane and load.

Technical Figures For A Quote

For a technical quotation, provide maximum load mass, load geometry and centre of gravity, together with the desired rotation function. Include crane type and rated capacity, hook and existing bottom-block drawings, sheave count, reeving and rope diameter, available headroom and any retrofit restrictions. Specify limited or continuous rotation, required speed control, available three-phase AC supply, radio-control integration, duty cycle and ambient conditions. Identify any requested brake and rotation lock, sensors, load weighing, slip ring, special hook or corrosion/heat protection.

Request a technical quotation for a Motorized Hook Block

Questions