Success Story – Shanghai: Gradin 15-Ton 90-Degree Marine Cylinder Liner Hydraulic Upender for CSSC Marine Power

Rotating an asymmetrical 15-ton cylindrical workpiece with a length of 4.8 meters across a 90-degree arc inside a deep pit presented critical metallurgical, kinetic, and positional challenges:

• Mirror-Finished Bore Surface Scratches and Radial Clamping Deformation: Marine cylinder liners feature precision-honed internal mirror bores and critical outer landing seats. Direct metal-to-metal contact during 90-degree rotation damages precision surfaces. The cradle requires full coverage of 10mm Polyurethane Protective Lining and cushioned rollers to eliminate metal friction.

• Dynamic Center-of-Gravity Shifts and Overturning Momentum: As the 15-ton cylinder pivots from horizontal to vertical, the gravitational center shifts drastically past the 45-degree midpoint. Without rigid physical restraint, the cylindrical mass can roll, slide, or tip over. The machine requires an active Hydraulic Mechanical Clamping Arm integrated with IFM/Keyence pressure sensors to lock the liner rigidly against the cradle throughout the entire 90-degree travel.

• Multi-Diameter Adaptability and Position Memory Requirements: CSSC manufactures various liner models with diameters ranging from 600 mm to 1,500 mm and lengths from 2.0 m to 4.8 m. Manual roller adjustment is labor-intensive. The system demands an Automated Motorized Roller Positioning Bed featuring lead-screw motorized multi-axis adjustment with over 10 programmable preset memory slots on the HMI.

• Sub-Floor Pit Clearance and Operator Accessibility at 90 Degrees: When rotated to a 90-degree vertical stance, the bottom segment of the 4.8m liner descends 1,750 mm into the Recessed Deep Concrete Pit Installation. To allow crane sling attachment and manual bottom flange inspections, the pit requires an automated Telescopic Arc Maintenance Platform supporting up to 200 kg.

• Zero Hydraulic Drift and Burst-Safe Hydraulic Locking: In the event of an electrical blackout or high-pressure hose puncture during mid-stroke turnover, the 15-ton load must remain locked at its exact angular position. The hydraulic circuit requires a Zero-Drift Hydraulic Holding Valve and integrated cylinder safety fuses to eliminate mechanical drift.

• High Torsional Deflection Along 4.8m Cantilevered Frame: Tilting a concentrated 15-ton load across a 4,800 mm length induces intense torsional stress on the main pivot shafts. The structural framework demands 45# quenched and tempered alloy pivot shafts, heavy Q235 steel plates (thickness >= 8.0 mm), and reinforced manganese steel cylinder brackets.