This heavy-duty four-mast vertical assembly station positions tooling crews alongside outsized industrial machinery. The platform eliminates ladder hazards and reach strain through synchronized machine screw jacks and motorized telescopic cantilever decks.
Rated Payload Capacity: 8000 kg / 17,600 lbs Safe Working Load (125% static proof-load tested to 10,000 kg)
Tower Structure Envelope: 7500 × 5500 × 6800 mm (L × W × H, surface-anchored structural frame)
Vertical Motion Profile: 4500 mm vertical stroke at 1.5 m/min via four synchronized machine screw jacks
Usable Working Surface: 5500 mm retracted to 7500 mm extended length × 2500 mm width with motorized cantilever slides
| Technical Parameter | Engineering Specification / Design Standard |
| Equipment Designation | Heavy-Duty Vertical Assembly Platform |
| Elevation Architecture | Four-mast electromechanical synchronized screw drive system |
| Rated Payload Capacity | 8000 kg / 17,600 lbs Safe Working Load (SWL) |
| Static Proof Test Block | 10,000 kg / 22,000 lbs (125% static proof-load test per ASME B20.1) |
| Mast Structural Sections | ASTM A572 Grade 50 heavy box-section structural steel columns |
| Material Traceability | Certified mill test inspection dossiers supplied per EN 10204 Type 3.1 |
| Vertical Motion Travel | 4500 mm continuous stroke (retracted height 1200 mm, raised height 5700 mm) |
| Lifting Drive Mechanism | Synchronized trapezoidal machine screw jacks (Tr100×16) with top brake motors |
| Drive Synchronization | Cross-linked mechanical torque line shafts with spiral bevel gearboxes |
| Horizontal Deck Extension | Motorized telescopic cantilever decks (2000 mm stroke, dual rack drives) |
| Personnel Access Pathway | Mast-integrated vertical caged safety ladder or multi-tier stairs |
| Access Stairway Incline | Ergonomic 45-degree pitch conforming to ISO 14122-3 stair height limits |
| Personnel Fall Safeguard | 1100 mm yellow tubular guardrails with toe boards on all sides |
| Platform Access Enclosure | Interlocked personnel sliding gates tied into emergency cutoff circuits |
| Operator Console Mount | On-deck IP54 pendant station and main mast master control console |
| Cable Management Carrier | Vertical high-flex engineering plastic drag chains in guide troughs |
| Design Standard Base | ANSI/ASME B20.1 and OSHA 1910.29 safety compliance for vertical stages |
Plate edge planing and twin-wire submerged arc welding join heavy structural plate into rigid ASTM A572 Grade 50 box columns. High section modulus prevents mast buckling under full cantilever overhang moments. Four vertical masts bolt to floor base beams, distributing tipping forces into structural foundations under an 8000 kg rated payload capacity. Mill test certificates supplied per EN 10204 Type 3.1 confirm plate yield strength above 345 MPa.
Precision thread whirl milling and induction hardening form the heavy trapezoidal screw jacks (Tr100×16), pairing low-pitch threads with bronze load nuts for positive mechanical self-locking. Top-mounted braked gear motors link with drive nuts and cross-connected mechanical line shafts to prevent corner skew. This positive shaft connection holds platform level within 1.0 mm across all four columns throughout the 4500 mm stroke without hydraulic drift.
Hardened linear bearing guide rails paired with dual-side synchronized rack-and-pinion drives control horizontal deck travel. Motorized cantilever decks stroke out 2000 mm over workpiece contours, positioning assembly technicians within close reach of difficult fastener locations. Heavy box subframes limit edge deflection below 2.5 mm while sustaining a 2000 kg cantilever proof-load at maximum extension reach.
Vertical technician access relies on an integrated mast ladderway equipped with a safety cage, rest platforms, and a continuous fall-arrest rail conforming to ISO 14122-4. Perimeter 2.3-meter wire mesh enclosures feature solenoid-interlocked sliding doors wired into the main control circuit. The safety logic cuts drive motor power if any gate opens, satisfying ANSI/ASME B20.1 standards to protect crews at raised tooling elevations.
Heavy earthmoving equipment plants position this four-mast station along excavator upper structures to mount powertrain modules and operator cabs. The structural frame sustains dynamic tooling and crew payloads with off-center load offsets up to 35% of deck breadth. Base mounting requires chemical anchor studs sunk into 25 MPa concrete floors, maintaining rigid footing across ambient assembly temperatures between -10°C and +45°C.
Aviation assembly bays deploy motorized cantilever extensions to contour around cylindrical aircraft fuselage sections during barrel splice operations. Fitters work from non-slip checkered platforms equipped with non-marking silicone edge bumpers and optical proximity sensors to install skin rivets without scratching exterior composite primers. The four-column tower anchors to hangar apron slabs, built to operate inside clean production environments between 0°C and +50°C.
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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