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Explosion-Proof Vertical Reciprocating Lift: 1.5-Ton VRC

Project Overview

A high-output electric vehicle battery manufacturing complex required a heavy-duty vertical material transfer system to transport large flexible intermediate bulk containers (FIBC ton-bags) of cathode and anode raw materials between the ground-level warehousing zone and the second-floor slurry preparation platform. Operating on a continuous 24/7 production schedule, the facility elevates approximately 150 metric tons of powdered active materials daily. Due to airborne solvent vapors and combustible fine dust particles generated during chemical staging, the entire installation envelope demanded strict Ex d IIB T4 explosion-proof classification.

Country/Region: East Asia Advanced Clean Energy Manufacturing Hub
Client Facility: EV Lithium-Ion Battery Cathode & Anode Slurry Preparation Plant
Equipment Model: Gradin Custom Explosion-Proof Vertical Reciprocating Lift (Model: G-VRC-1500-EX)
Industry Classification: Energy & Nuclear
Rated Working Payload: 1,500 kg (1.5 Metric Tons per batch pallet)
Vertical Rise & Landings: 4,500 mm (4.5 Meters) vertical rise serving 2 stops / 2 landings
Carriage Clear Dimensions: 1,500 mm (W) x 1,500 mm (D) x 2,000 mm (H) with Z-path through-loading
Operating Duty Cycle: 24/7 continuous operation handling ~150 tons of raw materials daily
Lifting Speed: 15 meters / minute constant vertical velocity

To eliminate particulate contamination and explosion hazards, the Gradin engineering team engineered a purpose-built Lithium Battery FIBC Ton-Bag Lifter. The machine adheres strictly to Zero Cu-Pb-Zn Contamination Standards, ensuring zero forbidden metals make contact with battery ingredients. The unit complies with the ASME B20.1 Safety Compliance code for vertical reciprocating conveyors . Factory operations integrated this Gradin explosion-proof vertical lift alongside custom explosion-proof vertical material lifts to streamline automated cleanroom logistics.

Challenge & Solution

Challenge

Operating a heavy-duty vertical lift in a 24/7 lithium battery material environment introduced critical safety, metallurgy, and dimensional challenges:

Strict Elimination of Copper, Lead, and Zinc Contaminants: Lithium battery active chemistry is destroyed by trace non-ferrous metal ions (Cu, Pb, Zn), which cause internal battery micro-shorts. The Explosion-Proof Vertical Reciprocating Lift required non-contact metallurgy across guide shoes, structural fasteners, carriage walls, and drive components in full accordance with Zero Cu-Pb-Zn Contamination Standards.
Continuous Ex d IIB T4 Explosion-Proof Operational Environment: Volatile NMP solvent vapors and airborne graphite/carbon powder create Zone 1 / Zone 2 hazardous explosive atmospheres. All electrical components required certified flameproof enclosures, including an Ex d IIB T4 Explosion-Proof Motor, spark-resistant wiring, and explosion-proof operator panels.
Heavy Dynamic Point Loads from Manual Pallet Jacks and 1.5-Ton Bulk Bags: When hydraulic pallet jacks roll 1,500 kg bulk bags into the carriage, localized floor wheel loads create severe dynamic threshold impact. Insufficient platform stiffness causes deck sagging, misaligning safety interlocks and accelerating wear on the 20A Heavy-Duty Drive Chain.
Factory Entryway Transit Restrictions: Plant airlocks and cleanroom corridors imposed a vertical clearance limit of 3.0 meters. The 5.16-meter mast required a Modular Mast Section Architecture engineered in sub-3-meter sections to allow manual transit without structural compromise.
Airflow Isolation and Thermal Insulation Across Floors: Elevating materials between cleanrooms creates air pressure imbalances and noise propagation. The shaft required an insulated SUS304 Rockwool Sandwich Cladding combined with a fast-acting High-Speed PVC Roll-Up Landing Door to maintain cleanroom air seals.
Continuous 24/7 Heavy Duty Cycle Reliability: Lifting 150 metric tons daily at 15 m/min requires fail-safe thermal dissipation in reducers, constant chain lubrication, and anti-drop mechanical pawl engagement during inter-floor transit.

Solution

The Gradin engineering team engineered a turnkey, cleanroom-compatible vertical lifting tower integrating explosion-proof kinematics, certified metallurgy, and intelligent Siemens automation:

Heavy-Gauge Carbon Steel Mast & SUS304 Diamond Deck: The main vertical mast is fabricated from 120 mm x 120 mm x 4 mm square structural steel tubing finished in safety blue powder coating. The carriage chassis uses 120 mm x 60 mm x 4 mm rectangular tubing with a 4.0 mm SUS304 diamond-tread stainless floor plate, easily withstanding concentrated wheel loads from 1,500 kg pallet jacks.
Full Ex d IIB T4 Explosion-Proof Drive Assembly: Lifting power is supplied by a 7.5 kW Grade-2 energy-efficient Dongli explosion-proof gearmotor (Ex d IIB T4, IP54, Class F insulation). The transmission utilizes a 20A Heavy-Duty Drive Chain operating on CNC-machined steel sprockets, delivering a smooth vertical travel rate of 15 m/min.
Zero Cu-Pb-Zn Metallurgy and Modular Mast Sections: All structural components, slide guides, and fasteners eliminate copper, lead, and zinc alloys in strict compliance with Zero Cu-Pb-Zn Contamination Standards. The mast was engineered as a Modular Mast Section Architecture with individual section heights capped at 2.85 meters, enabling transit through cleanroom doorways.
Sanitary Insulated Cladding & High-Speed Doors: The tower is wrapped in SUS304 Rockwool Sandwich Cladding (0.5 mm SUS304 + 50 mm rockwool + 0.5 mm SUS304) for fire isolation and sound damping. Landing openings feature automated High-Speed PVC Roll-Up Landing Door assemblies (W1500 x H2000 mm) equipped with explosion-proof motors, safety light curtains, and transparent viewing panes.
Siemens S7 PLC Architecture with Schneider Electric Switchgear: Automation is managed via an explosion-proof Siemens S7-200 SMART PLC enclosure paired with a Siemens vector variable frequency drive, Schneider Electric low-voltage contactors, and Omron explosion-proof limit switches.
Fail-Safe ASME B20.1 Mechanical Safety Interlocking: In full compliance with ASME B20.1 Safety Compliance, the carriage incorporates mechanical anti-drop safety dogs, slack-chain detection switches, and bi-directional interlocking gates that halt the lift if door seals are broken.

Technical Specifications

Specification Parameter	Technical Rating & Dimension Metric	Manufacturing Standard & Component Details
Equipment Functional Type	Continuous Heavy-Duty Reciprocating Lift	2-Stop / 2-Landing vertical material elevator
Target Cargo Profile	Lithium Battery FIBC Ton-Bag Lifter	1,500 kg FIBC bulk bags of cathode & anode powder
Rated Lifting Payload	1,500 kg (1.5 Metric Tons per trip)	Static structural overload rating: 150% (2,250 kg)
Total Vertical Elevation	4,500 mm (4.5 Meters) vertical travel	Level 1 cleanroom floor to Level 2 reactor mezzanine
Carriage Clear Dimensions	1,500 mm (W) x 1,500 mm (D) x 2,000 mm (H)	Z-path through-loading layout (1,500 mm direction)
Vertical Lifting Speed	15.0 meters / minute (Constant speed)	Controlled via Siemens variable frequency drive
Explosion-Proof Rating	Ex d IIB T4 (BT4 Zone 1 / Zone 2 Compliant)	Certified flameproof motors, junction boxes & switches
Contamination Control	Zero Cu-Pb-Zn Contamination Standards	Zero copper, lead, or zinc components utilized
Drive Motor Assembly	Ex d IIB T4 Explosion-Proof Motor	Dongli 7.5 kW Grade-2 efficiency gearmotor (IP54 / Class F)
Main Drive Chain Standard	20A Heavy-Duty Drive Chain	High-tensile alloy lifting chain with hardened link pins
Tower Mast Framing	120 mm x 120 mm x 4 mm square tubing	Heavy structural carbon steel tubing in Safety Blue
Modular Segment Design	Modular Mast Section Architecture	Tower mast sub-sections <= 3,000 mm for doorway transit
Carriage Deck Plate	4.0 mm SUS304 diamond-pattern plate	High-strength anti-slip stainless floor with steel base
Shaft Perimeter Cladding	SUS304 Rockwool Sandwich Cladding	0.5 mm SUS304 + 50 mm rockwool + 0.5 mm SUS304
Landing Gate System	High-Speed PVC Roll-Up Landing Door	Blue PVC rapid doors (W1500 x H2000mm) with viewing panes
Main Electrical Controls	Siemens S7-200 SMART PLC + VFD	Schneider Electric low-voltage gear & Omron limit switches
Operating Duty Intensity	24/7 Continuous Duty Cycle	Rated to transport ~150 metric tons of materials daily
Global Safety Compliance	ASME B20.1 Safety Compliance	North American conveyor & vertical lifter safety codes

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Explosion-Proof Vertical Reciprocating Lift: 1.5-Ton VRC

Project Overview

Challenge & Solution

Challenge

Solution

Technical Specifications

Project Gallery

Have a question or need technical advice? Our team is available 24/7 to assist you

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