1. System Overview
The PLC-controlled two-stage hydraulic lifting system is an advanced solution designed for precise and synchronized elevation in tank construction. It integrates hydraulic actuators with programmable logic controllers (PLC) to achieve automated, high-precision operations. The system typically comprises:

• Hydraulic cylinders: Dual-stage cylinders provide extended stroke capabilities, enabling efficient vertical lifting of heavy tank components.

• PLC control unit: Manages motion logic, pressure regulation, and synchronization between cylinders. Modern systems use integrated PLCs or industrial computers for real-time adjustments.

• Sensors: Distance detection modules (e.g., proximity sensors or laser measurement) monitor piston positions and ensure alignment accuracy. For instance, upper and lower distance sensors track the "striker plate" on the piston rod to calculate lift distances.

• Hydraulic power station: Supplies regulated oil flow to cylinders, with servo valves controlled by PLC signals for pressure and speed modulation.

2. Operational Workflow
The system operates in three phases:

• Initial positioning: Sensors calibrate the initial position of the tank structure. PLC algorithms adjust hydraulic pressure based on load requirements.

• Synchronized lifting: Dual cylinders are driven by PLC commands to ensure balanced force distribution. Real-time feedback from sensors allows dynamic corrections, minimizing tilt or misalignment.

• Safety protocols: Overpressure relief valves and emergency stop functions are integrated to handle unexpected loads or failures.

3. Technical Advantages

• Precision control: PLCs enable micron-level accuracy in lift height, critical for aligning large tank sections.

• Energy efficiency: Servo-driven hydraulic pumps reduce energy consumption by adjusting output to actual demand, unlike traditional constant-pressure systems.

• Modularity: The system supports manual, semi-automatic, and fully automated modes, adaptable to diverse construction scenarios.

• Reliability: Integrated hydraulic valves minimize leakage points, while robust PLC programming ensures long-term stability.