Electric Telescopic Heavy-Duty Rack for Sheet Metal Storage

Most workshops still store sheet metal the way they did thirty years ago: flat stacks on wooden dunnage, often double- or triple-stacked because floor space ran out. This approach creates three compounding problems.

The first is accessibility. When the needed sheet sits at the bottom of a stack, operators must unload every layer above it. A typical retrieval cycle for a buried sheet can consume 15 to 20 minutes of labor, and that does not account for the re-stacking time afterward.

The second is material integrity. Stainless steel, aluminum, and coated alloys scratch easily under friction from adjacent sheets. Edge deformation accumulates with every forklift contact. Over the course of a year, a workshop may scrap 2% to 5% of its sheet inventory from handling damage alone—an expense that rarely appears on any single work order but adds up across hundreds of sheets.

The third is space utilization. Flat-stacked sheets consume the entire footprint of the largest plate in inventory. A vertical telescopic rack from Herochu reclaims 60% to 70% of that occupied area by converting horizontal piles into tiered bays, each accessible on demand without disturbing neighboring layers.

How the Herochu Electric Telescopic System Works

At the core of the design is a motorized drive assembly that extends and retracts individual storage tiers. Each tier operates on industrial linear bearings paired with hardened guidance rollers, permitting travel under full rated load while keeping the pull force at the pendant control level effectively zero for the operator.

The drive system runs on 24 VDC electric motors, chosen deliberately over pneumatic or hydraulic alternatives. Low-voltage DC drives eliminate the need for compressed air infrastructure and reduce the fire hazard associated with hydraulic lines in a fabrication environment. Each motor connects to a pendant control unit with forward, reverse, and emergency-stop functions. The operator stands at a safe distance, presses a button, and the selected tier extends outward for crane or forklift access.

The extension mechanism employs a rack-and-pinion transmission. Unlike chain-driven drawers that can develop slack and misalignment over time, gear engagement maintains consistent positional accuracy. This matters when integrating the storage system with overhead crane waypoints or robotic loading cells, where the sheet position must be predictable to within a few millimeters.

Load Capacity and Configuration

Herochu offers this system across a model range calibrated to real workshop dimensions. The HC-B3015E-63 accommodates sheets up to 3,000 × 1,500 mm with a per-tier capacity of 3,000 kg across six levels—18 metric tons total when fully loaded. The mid-range HC-B6015E-65 handles 6,000 × 1,500 mm sheets at 5,000 kg per tier. At the upper end, the HC-B12025E-520 manages plates measuring 12,000 × 2,500 mm with a staggering 20,000 kg per tier, designed for shipyard plate storage and heavy structural fabrication.

The number of tiers is not fixed. Herochu engineers configure the rack based on the maximum sheet height the customer expects to store. Each tier opening provides 200 mm of clearance as a standard reference, with custom heights available in 25 mm increments. This prevents the common problem of overbuilt racks with wasted vertical space between levels, which directly reduces the total number of tiers that can fit within the facility’s ceiling height.

The clear space between loaded sheets and the rack structure is set at 120 mm by default and can be customized wider for facilities that use magnetic or vacuum lifters requiring additional insertion clearance.

Material Protection and Corrosion Resistance

Sheet metal storage racks live in a hostile environment: coolant mist, grinding dust, humidity from open bay doors, and occasional contact with hot cut parts. Herochu addresses this through material selection and surface treatment rather than through maintenance-dependent protective measures.

The entire frame uses Q235B structural steel, selected for its combination of weldability and yield strength. After welding, the assembly undergoes shot blasting to SA 2.5 standard, followed by a zinc-rich electrostatic powder coating. This surface treatment meets C3 corrosion class requirements and is available in standard RAL colors for facilities that color-code storage zones by material type.

Drawer decks feature rubber or polyurethane-lined contact surfaces. The lining absorbs minor vibration during extension and retraction, preventing the micro-abrasion that occurs when bare steel-on-steel contact vibrates at the drive frequency. For workshops storing mirror-finish stainless or pre-painted sheet, this detail eliminates the need for protective interleaving sheets that add cost and disposal waste to every retrieval cycle.

Operational Efficiency Gains

The productivity arithmetic is straightforward. A workshop running two shifts with three sheet retrievals per shift in a conventional flat-stack layout spends roughly 108 minutes per day on handling—nearly two hours of labor that produces no value. With the electric telescopic system, each retrieval drops to approximately 90 seconds, cutting daily handling time to 9 minutes across both shifts.

Single-operator capability is the multiplier. Conventional sheet handling often requires a second person to guide the forklift or steady the stack during extraction. The motorized extension eliminates this dependency. One operator controls the pendant while the overhead crane or forklift operator does the lift, without a third person coordinating between them.

The system also compresses storage footprints. A facility that previously dedicated 200 square meters to sheet storage might reclaim 120 to 140 square meters after installing a multi-tier electric telescopic rack—space that can host an additional CNC cutting table, a press brake cell, or expanded assembly area. At industrial lease rates, that recovered square footage often delivers a full return on the rack investment within 8 to 12 months before accounting for labor savings.

Safety in Operation

Herochu builds safety into the mechanical design rather than relying on operator training alone. Each tier incorporates a positive anti-tilt lock that engages automatically at full extension, preventing the cantilever moment from tipping the assembly forward under load. Anti-fall clamping tabs grip the extended tier from above, providing a secondary mechanical stop independent of the drive motor brake.

The pendant control includes a dead-man switch configuration: releasing the button immediately halts all motion. Emergency stop buttons are positioned at both the control station and the far end of the rack assembly, so an operator standing on either side can cut power instantly.

Radiused corners on all exposed frame edges eliminate the sharp-angle snag points common on cheaper racking. For facilities in seismic zones, optional bracing kits anchor the rack assembly to the floor slab with epoxy-set anchors rated for lateral loads per local building codes.

Integration with Existing Workflows

The electric telescopic rack does not demand that a workshop reorganize around it. The system sits between raw material receiving and the first processing station—typically a CNC laser, plasma table, or waterjet cutter. Sheets arrive on a truck, get lifted into designated rack tiers by overhead crane, and sit protected until a work order calls for them.

For facilities with WMS or ERP integration, Herochu provides barcode-tagged tier locations and can supply a digital inventory map that tells the warehouse manager exactly which alloy, thickness, and sheet dimensions occupy each tier. This eliminates the clipboard-and-marker system that plagues conventional sheet yards, where the person who knows where the 10-gauge 316L is located might be on vacation.

CNC laser cutting stations benefit most directly. When the loading side of the laser table is positioned adjacent to the rack, the telescopic tier extends, the vacuum or magnetic lifter picks the sheet, and the operator retracts the tier—all within the laser’s typical cutting cycle. There is no forklift traffic between the rack and the machine, which eliminates both idle time and collision risk.

How to Select the Right Configuration

Choosing the correct model starts with three measurements: the largest sheet dimension the facility handles, the heaviest single plate weight, and the available ceiling height. The sheet dimension determines the rack’s width and depth. The plate weight sets the per-tier capacity requirement, which dictates the motor torque, bearing size, and frame cross-section. The ceiling height, minus clearance for the crane hook at its highest position, determines how many tiers can fit.

Herochu’s application engineers typically request a one-week material flow log from prospective customers. The log reveals which sheet types are accessed most frequently, which sit idle for weeks, and whether retrieval patterns follow a predictable sequence or fluctuate daily. This data shapes the tier assignment layout: high-turnover sheets go in the waist-height tiers for the fastest ergonomic access, while long-term stock occupies the upper and lower extremes.

The system ships as a bolted assembly that can be installed within three to five working days by a two-person crew with standard rigging tools. No embedded floor rails, foundation modifications, or special power supplies are required beyond a standard 220 V single-phase outlet serving the DC power supply unit.

Summary

The electric telescopic heavy-duty sheet metal storage rack from Herochu Machinery replaces disorganized floor stacking with a powered, classified storage system that protects material, compresses footprints, and accelerates retrieval cycles. It is engineered for workshops that handle sheet volumes large enough to make handling time a measurable drag on throughput, and it pays for itself through labor reduction and recovered floor space well within the first year of operation.