Pre-Shipment Testing and Inspection Checklist for Hydraulic Lifting Emulsifiers
I. Mechanical Structure Inspection
External Condition
Check for deformations, cracks, or looseness in the equipment housing and welding joints.
Ensure the lifting platform surface is flat, with secure support points and hinges.
Fasteners and Limit Devices
Inspect bolts, screws, and other fasteners for looseness or detachment.
Verify travel switches at upper/lower limit positions are properly adjusted to prevent piston overtravel damage.
II. Hydraulic System Inspection
Hydraulic Fluid Status
Confirm oil level is between the minimum and maximum marks on the dipstick; fluid must be clear and free of contaminants (replace if discolored or containing metal particles).
Check for leaks at oil pipes and joints; ensure high-pressure hoses show no cracks or bulges.
Pumps and Valves
Prime variable pumps with hydraulic oil before startup and verify correct pump rotation direction.
Adjust relief valves to safe pressure ranges; confirm power supply voltage for solenoid valves (e.g., DC24V or AC220V).
Accumulators and Pipelines
Verify accumulator pre-charge pressure meets specifications.
Inspect high-pressure pipeline clamps for tightness; ensure low-pressure return valves are open.
III. Electrical and Control System Inspection
Power Supply and Grounding
Check three-phase voltage fluctuation ≤ ±10%; grounding resistance ≤ 4Ω.
Test control panel functions (e.g., "single-cycle" mode) and instrument displays (e.g., pressure gauge zeroing).
Solenoid Valves and Safety Interlocks
Validate solenoid valve actuation sequence and response time (no delays or malfunctions).
Test safety interlocks: door locks, emergency stop button, overload protection, etc.
IV. Operational Testing and Performance Verification
No-Load Testing
Jog the motor to confirm rotation direction; observe pump operation for smoothness and abnormal noise.
Cycle the lifting platform multiple times at low pressure to purge air from the hydraulic system.
Load Testing
Gradually increase system pressure to the rated value; hold for 1-2 minutes to check for leaks in pipes and seals.
Verify hydraulic cylinder movements are smooth and shock-free; temperature rise should remain within 30–55°C.
V. Safety Devices and Cleaning
Safety Systems
Inspect work lights, indicators, directional signs, and multi-level protection devices.
Test emergency descent functions (e.g., manual pressure relief valve operation during power failure).
Cleaning and Documentation
Remove debris, oil residue, and metal particles from internal/external surfaces.
Record test parameters (pressure, oil temperature, current, etc.) for archival purposes.
Key Focus: Ensure mechanical, hydraulic, and electrical systems are thoroughly validated, emphasizing safety interlocks, pressure stability, and compliance with industrial standards.
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