In high-throughput multi-tier warehousing and manufacturing facilities, manual freight movement or traditional single-platform freight elevators create severe operational bottlenecks. Relying on forklifts or standard vertical reciprocating conveyors often results in idle return trips, high labor costs, and elevated risks of pallet drops.The Gradin Continuous Fork Vertical Conveyor resolves these process constraints by pairing a continuous vertical loop fork elevator with localized heavy-duty motorized roller conveyor lines. This integrated setup allows multiple cargo units to be loaded and vertically transported simultaneously without waiting for the carriage to return, drastically accelerating cycle times. Designed in strict compliance with ASME B20.1 safety standards for conveyors, this heavy-duty system eliminates material handling downtime, reduces energy consumption per pallet transfer, and mitigates warehouse mezzanine congestion. By managing horizontal-to-vertical transfer via synchronized PLC automation, Gradin ensures your multi-level materials flow smoothly, safely, and constantly.
All specifications listed below are highly adaptable and can be fully customized by Gradin to meet your exact installation space limitations, throughput requirements, and structural payloads.
| Parameter | Standard Ranges | Customization Notes |
| Lifting Capacity | 20 kg to 1,500 kg per pallet/tote | Fully Customizable by Gradin |
| Conveying Speed | 10 m/min to 60 m/min | Controlled via VFD for optimized travel curves |
| Throughput | Up to 1,200 cycles/hour | Tailored to fit production line capacity |
| Structural Frame | Heavy-Wall Q355B Box Steel / Stainless Steel | Selected based on structural deflection and cleanroom criteria |
| Motor Drive System | SEW-Eurodrive Geared Motor (IP55/IP66) | Explosion-proof options available (ATEX/Ex) |
| Chain Type | Heavy-duty Leaf Chain / Roller Chain with Auto-Tensioner | Selected for maximum tensile strength and low maintenance |
| Roller Conveyor Width | 400 mm to 1,500 mm | Configured to match customer’s pallet or box specifications |
| Control Architecture | Siemens S7-1200 / 1500 PLC | Seamless integration with warehouse WMS/WCS systems |
| Sensors & Detection | Sick / Omron Photoelectric Array | Customized sensor layout for special pallet types |
| Main Structural Tower (Q355B) | |
| Continuous Loop Drive Chain | → SEW Geared Motor with VFD |
| Retractable Carrier Forks (Cantilever) | |
| Integrated Motorized Roller Lines (Entry/Exit Transitions) | |
| Siemens S7 PLC Enclosure + Sick Photo-Eyes Array | |
Q355B Steel Structural Mast
Field Pain Point : Structural twisting and mast deflection under off-center dynamic loads during continuous lifting, leading to conveyor chain derailment or guide rail deformation.
Bespoke Solution & Benefit : Gradin uses heavy-wall Q355B structural steel box profiles with CNC-milled guide tracks, ensuring zero-deflection vertical alignment and preventing chain misalignment even under continuous multi-pallet loading.
Retractable Alloy Steel Cantilever Forks
Field Pain Point : Product scraping, interference, or unstable support during high-speed continuous pickup when pallets have slight structural or positioning deviations.
Bespoke Solution & Benefit : Custom-engineered high-tensile alloy steel forks equipped with polyurethane wear pads and self-centering guides, delivering positive pallet engagement, preventing product slippage, and protecting sensitive plastic or wooden pallets.
Integrated Multi-Section Motorized Roller Conveyors
Field Pain Point : Inaccurate transition timing and speed mismatches between the continuous lift and feed-in/feed-out conveyor lines, causing pallet collisions.
Bespoke Solution & Benefit ): Synchronized multi-zone motorized roller conveyors equipped with SEW-Eurodrive gearmotors, providing millimetric synchronization to achieve continuous, jerk-free pallet handovers.
Dual-Chain High-Tensile Suspension & Automatic Tensioning
Field Pain Point : Rapid chain elongation and uneven tension over thousands of operating cycles, resulting in tilted forks and severe drive sprocket wear.
Bespoke Solution & Benefit : Industrial-grade leaf chains paired with spring-loaded auto-tensioning units and proximity sensor monitoring, maintaining perfect horizontal fork alignment and extending component service life.
VFD-Driven Heavy-Duty Gearmotor System
Field Pain Point : Sudden starts and stops causing cargo to shift, tip over, or accelerate mechanical wear on the main drive shaft.
Bespoke Solution & Benefit : An SEW-Eurodrive geared motor controlled by a Variable Frequency Drive (VFD) executing smooth S-curve acceleration and deceleration profiles, safeguarding delicate components and reducing peak electrical start-up currents.
Smart PLC Automation & Photo-Eye Array
Field Pain Point : Pallet jams, double-feeding, or out-of-gauge cargo passing into the continuous lift, leading to mechanical crashes and extensive factory downtime.
Bespoke Solution & Benefit : A centralized Siemens S7-1200 PLC controller utilizing a comprehensive array of Sick photoelectric sensors to perform real-time height, width, and weight verification before accepting the pallet.
Category 4 Safety Light Curtains & Interlocked Fencing
Field Pain Point : Operators inadvertently entering the fast-moving continuous vertical lift path during automated operation, causing severe crush injuries.
Bespoke Solution & Benefit : Integration of Category 4 safety light curtains at all entry/exit portals, interlocked with the main control panel to instantly drop power to the motor and trigger mechanical brakes in emergency situations.
Heavy-Duty Base Anchor Plates with Leveling Jackets
Field Pain Point : Uneven factory floors causing vertical misalignment over time, requiring expensive foundation re-pouring or causing premature frame fatigue.
Bespoke Solution & Benefit : Custom-engineered oversized structural steel baseplates with high-tensile leveling bolts and chemical anchors, allowing easy adjustment during installation to secure a perfectly plumb vertical axis.
E-Commerce & Retail Fulfilment Mezzanines
In high-volume distribution centers where plastic totes and cartons must travel non-stop between ground storage and multi-tier mezzanines. The integrated motorized roller lines queue products perfectly, allowing the Continuous Fork Vertical Conveyor to pick up and drop off totes on the fly at up to 1,200 units per hour, eliminating batch transport waiting times.
Automotive Powertrain Sub-Assembly Lines
Transporting heavy engine blocks or transmission pallets between floor level and overhead buffer lines. Utilizing Q355B structural steel frames, this lifting solution ensures heavy dynamic forces do not compromise precision alignment during continuous lifting operations, minimizing assembly cycle times.
Cold-Chain Food & Beverage Warehousing
Operating inside refrigerated zones down to -25°C. The system utilizes low-temperature lubricants, condensation-resistant proximity sensors, and IP66-rated junction boxes, feeding motorized roller lines to keep palletized goods moving rapidly into cold storage without warm-air backflow.
Lithium-Ion Battery Manufacturing Facilities
Moving sensitive battery tray fixtures through cleanroom environments or dry rooms. Outfitted with stainless steel structural parts, anti-static (ESD) rollers, and non-outgassing polyurethane forks to meet strict ISO-rated cleanroom contamination and spark-free explosion-proof criteria.
Fast-Moving Consumer Goods (FMCG) Packaging Lines
Connecting high-speed automated packaging and cartoning lines with overhead main palletizing systems. The continuously moving forks eliminate the severe bottle-necking caused by standard reciprocal elevators, integrating with variable speed conveyor loops to balance packaging output fluctuations.
For this heavy-duty series, we can engineer load capacities up to [300] tons, with platform dimensions and lifting heights customized to your operational envelope. Requirements exceeding our standard engineering matrix will undergo a Finite Element Analysis (FEA) by our engineering team to ensure structural viability before proposing a solution.
To initiate the engineering proposal, please provide the following baseline data:
Rated Load Capacity
Maximum Lifting Height & Closed Height
Platform Dimensions (L x W)
Duty Cycle (e.g., operational cycles per hour/day)
Environmental Conditions (e.g., indoor/outdoor, washdown, explosion-proof)
Pit depth or overhead clearance constraints
Yes. The control systems can be equipped with standard communication protocols (e.g., Profinet, Modbus, Ethernet/IP) utilizing [Siemens / Allen-Bradley / Omron] PLCs. This ensures seamless I/O signal synchronization with upstream/downstream conveyors, AGV/AMR units, and your central control room.
Every custom unit undergoes a mandatory Factory Acceptance Test (FAT) prior to dispatch. This includes continuous operational testing at 100% rated load, static overload testing at [120% / 125%] capacity, and the physical triggering of all mechanical anti-fall and hydraulic safety interlocks. FAT documentation and video proof are included in your engineering package.
Upon final approval of the General Arrangement (GA) drawings, the manufacturing lead time is typically 4 to 8 weeks. Oversized structural components are engineered with a modular design to fit into standard shipping containers (20FT/40HQ). On-site assembly utilizes pre-engineered bolted flange connections and heavy-duty aviation plugs, strictly eliminating the need for field welding.
We provide a standard [12/24]-month warranty covering the structural frame and primary hydraulic/electrical components. To minimize operational downtime, a comprehensive set of standard consumables (e.g., cylinder seal kits, travel switches, relays) is shipped alongside your equipment. During the warranty period, replacement parts for non-human-induced failures are dispatched via priority air freight (DHL/FedEx) within 48 hours.
Beyond the warranty, we guarantee lifetime engineering support. Your custom equipment's CAD drawings, electrical schematics, and BOM (Bill of Materials) are permanently archived in our system. This ensures you receive uninterrupted remote troubleshooting, maintenance guidance, and exact spare parts matching for the entire lifecycle of the equipment.
Gradin Machinery is a leading manufacturer specializing in aerial work platforms and hydraulic lifting solutions. With ISO & CE certifications, we provide safe, reliable, and customized equipment for global industrial needs
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