A vertical reciprocating conveyor engineered with opposed dual masts to balance dynamic load distribution. 100% custom-built to your specific floor plan, this straddle architecture eliminates severe cantilever stress and accommodates oversized carriage geometries for seamless through-loading or 90-degree transfer.
Kinetic Balance: Symmetrical mast geometry specifically engineered to neutralize eccentric bending moments and stabilize multi-ton, off-center payloads.
Scalable Footprint: Carriage dimensions and structural spans strictly calculated to integrate exactly with your existing warehouse or mezzanine constraints.
Synchronous Actuation: Dual-axis drive logic ensures absolute carriage leveling and zero-vibration floor docking during high-impact forklift loading.
| Technical Category | Engineering Keys | Standard Reference | Gradin Bespoke (ETO) |
| I. Performance | Rated Payload | 1,000 kg – 5,000 kg | Scalable up to 150,000kg (150T+) |
| Raising Speed | 0.10 m/s | Synchronized (0.4 – 1.0 m/s+) | |
| Positioning | ± 20 mm | Sub-Millimeter (± 1 mm) | |
| II. Structural | Configuration | Single-Sided Cantilever | S-Series Balanced Straddle (2-Post) |
| Mast Engineering | Rolled C-Channel | FEA-Optimized High-Rigidity Alloy | |
| Drive Medium | Single Roller Chain | High-Tension Belt / Heavy-Duty Multi-Chain | |
| III. Intelligence | Control Architecture | Relay Logic | Siemens S7-1500 / 5G Ready |
| Communication Protocol | Manual I/O | Profinet / EtherCAT / TCP-IP | |
| Feedback System | Limit Switches | Absolute Encoders / Laser Range | |
| IV. Compliance | Risk Mitigation | Basic Gates | Active SIL 3 / Perimeter Interlocks |
| Global Standards | Local Codes | OSHA / ASME B20.1 / CE / ISO 13849 |
Standard 2-post lifts often suffer from structural deflection when loads are not perfectly centered. Gradin S-Series systems utilize Finite Element Analysis (FEA) to optimize the straddle geometry, ensuring the center of gravity remains balanced within the structural masts.
Moment-Resistant Chassis: High-yield box-section alloy steel masts absorb torsional forces, preventing “platform-tip” during high-tonnage loading.
Zero-Deflection Engineering: Structural chassis design ensures the platform remains perfectly horizontal, even under extreme eccentric point-loads, preserving the fatigue life of the mast assembly.
Modal Analysis: We calculate the harmonic frequency of the 150T+ structure to neutralize vibration during high-velocity vertical indexing.
Standard straddle lifts rely on mechanical stops that cause leveling drift and “bounce.” Gradin bypasses these failures with Closed-Loop Control Architecture integrated natively into the mechanical drive.
Millimeter-Level Calibration: Real-time absolute encoder feedback ensures the deck aligns with the facility floor with ±1mm accuracy, critical for high-speed AGV and AMR handshakes.
Dynamic Torque Management: The drive monitors motor draw in real-time, adjusting acceleration ramps to prevent cargo shifting or structural shock during high-speed vertical pulses.
Redundant Actuation: Multi-line drive systems ensure that kinetic load is distributed evenly across the straddle masts, eliminating uneven wear on the guide rollers.
The S-Series functions as a transparent node within your facility’s digital infrastructure, moving beyond a simple lift into an intelligent vertical conveyor node.
WMS/MES Handshake: Full-stack digital transparency allows the lift to pre-position based on warehouse traffic and report real-time occupancy to execution systems.
Predictive Maintenance Monitoring: Integrated sensors monitor vibration, temperature, and cycle counts, utilizing machine learning to predict service requirements before unplanned downtime occurs.
Bespoke Deck Tooling: The platform is engineered with active top-tooling, such as motorized rollers or automated locking jigs, designed to match the specific DNA of your cargo.
[Automotive] – Heavy Stamping Die Transit
The Challenge: Moving 50T+ stamping dies to mezzanine levels where footprint is limited and eccentric loading is a constant risk.
Gradin Solution: A bespoke Gradin 2-Post Straddle Lift with FEA-validated mast reinforcement. The straddle configuration centers the 50T load between the columns, providing absolute stability for automated die-changing cycles.
[Logistics] – High-Velocity AGV Floor-to-Floor Transfer
The Challenge: Vertical transfer of autonomous mobile robots (AMRs) that require a perfectly flush, ±1mm floor transition to prevent sensor faults or drive-wheel damage.
Gradin Solution: Bespoke S-Series engineered with high-resolution laser feedback and Siemens S7-1500 logic. This ensures a seamless “drive-on/drive-off” transition for high-value robotic fleets.
[Manufacturing] – Heavy Component Buffering
The Challenge: Continuous vertical buffering of 10T engine blocks between production floors. The system must operate 24/7 with zero vibration and minimal maintenance.
Gradin Solution: A custom 2-post lift utilizing high-tension belt drives and vibration-dampening carrier mounts, acoustically optimized for ergonomic factory environments.
Redundant Risk Mitigation Architecture
Safety in high-tonnage vertical logistics is our absolute engineering priority. We exceed standard codes through multi-layered mechanical and digital redundancy.
Kinetic Arrestors: Secondary mechanical anti-fall cams engage guide rails instantly if deviation in drive tension or overspeed is detected.
Active Perimeter Shielding: Full-height shaft enclosures with high-speed power doors, electronically interlocked with the Safety PLC to prevent operator entry.
Fail-Safe Braking: Dual-channel electromagnetic braking systems provide a 200% holding torque safety margin, meeting ISO 13849-1 (SIL 3) and ASME B20.1 standards.
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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