The Gradin Hydraulic Cylinder Liner Upender rotates 15000 kg marine diesel engine liners across a 90-degree arc, eliminating overhead crane sling damage and bore distortion in shipyard machine shops.
Rated Capacity: 15000 kg (15T gross)
Envelope / Pit: 5.7 x 3.0 x 1.75 m pit
Motion Spec: 90° tilt in 70 seconds
Working Surface: 4.8 x 2.6 m cradle
| Engineering Parameter | Imperial Measurement | Metric Value | Structural Standard & Material Traceability |
| Rated Load Capacity | 33069 lbs | 15000 kg (15 Metric Tons) | Uniformly rated on 15-ton marine diesel engine upender |
| Turnover Angular Travel | 90° Arc Stroke | 0° to 90° Continuous | Stepless hold at any intermediate position |
| Turnover Cycle Duration | 70 ± 15% seconds | 70S ± 15% Travel | Variable frequency speed regulation |
| Primary Platform Face | 15.75 x 8.53 ft | 4800 mm x 2600 mm | Working face with adjustable roller tracks |
| Upright Cradle Flange | 8.53 x 6.56 ft | 2600 mm x 2000 mm | Vertical retaining bulkhead with protective board |
| Civil Foundation Pit | 18.70 x 9.84 x 5.74 ft | 5700 x 3000 x 1750 mm | Reinforced pit-mounted 90-degree tilter recess |
| Machine Dead Weight | 33069 lbs max | ≤ 15000 kg (15 Tons) | Heavy structural plate counter-weight ballast |
| Structural Steel Grade | High-Yield Plate | ≥ 8 mm Carbon Steel | ASTM A36 structural steel cradle (certified GB Q235B) |
| Pivot Pin Metallurgy | AISI 1045 Quenched | 45# High-Grade Carbon | Induction heat-treated pivot shafts (EN C45E equivalent) |
| Protective Surface Deck | 0.394 in Lining | 10 mm Cast Sheet | 10mm polyurethane protective lining on working faces |
| Motor Drive Rating | 20.1 HP Inverter Duty | 15.0 kW / 380V / 50Hz | Siemens IE2 motor driving high-pressure gear pump |
| Hydraulic Valve Circuit | Modular Manifold | Electro-Proportional | Beijing Huade counterbalance manifold with holding valves |
| Clamping Arm Actuator | Heavy Welded Ram | Hydraulic Rotating Jaw | Hydraulic rotating clamp arm with mechanical lock |
| Clamping Pressure Sensor | Digital Transducer | IFM / Balluff Sensing | Closed-loop one-key clamp pressure maintenance |
| Roller Traverse Drive | 4-Unit Independent | Motorized Lead Screw | Motorized lead screw roller carriages (10-preset memory) |
| Electrical Control Unit | Digital PLC Cabinet | Mitsubishi Logic System | Floor cabinet combined with wireless radio remote |
| Safety Certification | CE Machinery Directive | GB 5083-1999 Standards | Certified to BS EN 1570-1:2024 |
Welded from heavy structural steel plate and reinforced with an internal rib lattice, this ASTM A36 structural steel cradle (certified GB Q235B equivalent with EN 10204 3.1 inspection certificates) eliminates angular frame deflection under 15-ton concentrated loads. The heavy chassis anchors to a 45# quenched carbon steel pivot shaft (AISI 1045 equivalent), absorbing rotational torsion during continuous shipyard production turns.
Driven by an auxiliary hydraulic cylinder and monitored via German IFM pressure transducers, this hydraulic rotating clamp arm applies programmable holding force against the cylinder liner exterior. The clamping circuit locks the workpiece against the L-cradle, eliminating forward tipping, axial slipping, and dynamic vibration as the heavy mass passes the critical 45-degree center-of-gravity overturn threshold.
Integrated directly into the horizontal cradle bed, four motorized lead screw roller carriages translate along machined linear tracks to support variable engine bore sizes. Each roller features a 10mm polyurethane protective lining that prevents metal-to-metal gouging on outer flange faces, while an onboard PLC stores 10 unique position presets for rapid workpiece changeover on this pit-mounted 90-degree tilter.
Hard-piped to custom heavy hydraulic rams, this Beijing Huade counterbalance manifold uses pilot-operated holding valves to prevent uncommanded cradle drop during power interruptions. The 15 kW Siemens motor incorporates a variable frequency drive that ramps turnover speeds without pressure spikes, satisfying EN 1570-1 machinery compliance while maintaining zero leakage under high-pressure duty cycles.
Engineered for CSSC marine power plants producing two-stroke and four-stroke crosshead propulsion engines. This 15-ton marine diesel engine upender accepts finished liners in horizontal positions for ultrasonic testing, then rotates them 90 degrees to vertical orientations for bore honing and deep-hole drilling. The rigid cradle handles asymmetric flange centerlines across factory temperatures from -10°C to +50°C.
Deployed at heavy metallurgical facilities producing heavy centrifugally cast iron liners and marine cylinder barrels. The 10mm polyurethane protective lining resists residual cutting fluids, stamping lubricants, and metal swarf abrasion. Bolted inside a 5700 x 3000 x 1750mm reinforced foundation pit, the structure absorbs floor-level vibrations without anchor bolt loosening.
Serves shipyard engine reconditioning bays where worn marine engine liners require extraction, non-destructive crack inspection, and dimensional re-qualification. The operator uses an industrial radio remote controller from 10 meters away, maintaining clear visual sightlines while the machine transitions oversized tubular forgings between storage skids and vertical machining centers.
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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