Electric Telescopic Cantilever System | Herochu Heavy-Duty Long Load Storage

Storing heavy-duty long loads—such as steel beams, concrete pipes, or marine-grade lumber—requires more than just a sturdy rack. It demands a system that can safely extend and retract under extreme bending moments, maintain alignment over lengths exceeding 15 meters, and withstand the abuse of daily forklift or crane operations. Herochu’s electric telescopic cantilever system addresses these challenges with a heavy-duty design that combines telescopic steel tubes, a robust electric drive, and a frame engineered for dynamic loading.

What Makes a System “Heavy-Duty” for Long Loads?

The term “heavy-duty” is often overused. For Herochu, it means each cantilever arm is rated for a minimum of 1000 kg at full extension, with a safety factor of 2.5x based on yield strength. More importantly, the system is designed for long loads—those with length-to-width ratios exceeding 10:1. Such loads create high lateral forces if the rack is not perfectly level, and they require precise synchronization between multiple arms to avoid twisting.

Herochu’s electric telescopic cantilever system uses a master-slave synchronization approach. One master arm on each upright contains the drive motor and position sensor. Up to four slave arms on the same side are mechanically linked via a torque tube or, in more advanced configurations, independently driven with electronic synchronization. This ensures that when the master arm extends, all slave arms move in unison, keeping the long load horizontal and preventing binding.

Telescopic Cantilever Architecture for Heavy Loads

Traditional telescopic cantilever arms for light duty use C-shaped channels or thin-walled tubes. For heavy-duty applications, Herochu fabricates arms from rectangular structural steel tubing with wall thicknesses of 6 mm to 10 mm, depending on capacity. The telescopic sections are not simple square tubes inside square tubes—they use a captured roller bearing design. Each stage rides on eight hardened steel rollers (four per side) that run in machined tracks. This reduces friction and eliminates metal-to-metal sliding, which would cause galling under heavy loads.

The extension mechanism is a double-strand roller chain driven by a hydraulic motor or, more commonly, an electric linear actuator. Herochu prefers electric linear actuators for heavy-duty telescopic cantilever systems because they provide precise position feedback via an integrated encoder. The actuator pushes a crossbar that connects to the innermost tube, which then pulls the intermediate tube through a cable-and-pulley arrangement. This “push-pull” method achieves up to 3:1 extension ratios—for example, a 1-meter collapsed arm can extend to 3 meters.

For the heaviest applications (e.g., storing 12-meter-long steel I-beams weighing 2 tonnes per pair of arms), Herochu offers a dual-actuator configuration. Two linear actuators, one on each side of the arm, work in parallel. A load-sharing controller ensures they extend at identical speeds, preventing racking. This design has been tested to 2000 kg per arm at 2.5 meters extension.

Structural Frame for Long Load Stability

A cantilever rack is only as strong as its upright column and base. For long loads, the uprights must resist not only the vertical load but also the moment created by the load’s center of gravity being far from the column face. Herochu’s heavy-duty system uses tapered H-beams for uprights, with flange widths of up to 200 mm. The base is a welded assembly of H-beam and channel sections, with outriggers extending 1.5 times the maximum arm extension. For example, if the arm extends 2 meters, the outrigger length is at least 3 meters. These outriggers are bolted to the floor using 20 mm diameter anchor bolts.

Cross bracing is critical. Herochu uses X-bracing with turnbuckles for preload, eliminating any sway. In systems taller than 4 meters or in seismic zones, additional horizontal diagonal braces are installed at every level. The result is a rack that deflects less than L/400 under full load, where L is the arm extension.

Electric Drive and Control Features

The electric telescopic cantilever system can be operated via a handheld controller with a digital display showing actual extension length in millimeters. Operators can program up to 10 preset positions (e.g., 500 mm for short pipes, 1800 mm for long beams). A soft-start, soft-stop feature prevents load swing during acceleration and deceleration. This is especially important for long loads, which have high rotational inertia.

Safety features include:

• Optical obstruction sensors at the tip of each arm. If the sensor detects an object (such as a worker or a pallet) during extension, the system stops and reverses 100 mm.

• Load cells in the arm pivots that measure actual weight. If the load exceeds 110% of rated capacity, the system disables extension and sounds an alarm.

• Redundant brakes – a primary electromagnetic brake and a secondary spring-applied brake for fail-safe operation.

Application Spotlight: Steel Service Centers

A typical customer is a steel distributor handling 12-meter lengths of rectangular hollow section (RHS) weighing up to 800 kg per piece. Before installing Herochu’s electric telescopic cantilever system, they stored RHS on floor racks, requiring a crane operator and two riggers to retrieve one piece. After installation, a single operator uses a remote to extend the desired arm, the overhead crane places the bundle onto the extended arms, and the operator retracts the arms to clear the aisle. The system’s 5-level design tripled their storage density.

For residual material management—cut pieces ranging from 2 to 5 meters—the telescopic function allows the same rack to accommodate varying lengths without leaving empty arm sections protruding into the aisle. This is a key advantage over fixed-arm cantilever racks, which always occupy the same floor space regardless of whether they are fully loaded.

Customization and Lead Times

Herochu offers full customization. The height can range from 0 to 5 meters, number of levels from 2 to 7, and arm length from 500 mm to 1000 mm standard, with telescopic extensions up to 3000 mm upon request. Raw material is GB-T Q235B, Q345, or 45# high-grade carbon steel. Surface treatment is powder coating (standard) or hot-dip galvanizing (for outdoor or wet environments). Lead time is 20 days for standard customizations; complex projects with engineering design may take 30 days. All products include SGS and ISO certification, and Herochu provides installation drawings and remote engineering support.

Long-Term Value

Investing in an electric telescopic cantilever system for heavy-duty long load storage reduces workplace injuries (no manual cranking, no climbing to retrieve loads), increases storage density by up to 200% compared to floor storage, and extends material life by preventing damage from improper stacking. For operations handling steel, pipe, lumber, or concrete products, Herochu’s system represents a quantifiable return on investment typically realized within 18 months of operation.