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Analysis of the Overpressure Protection System for Fully Automatic Wet-Spray Trolleys
Release time:
2026-06-12
Source:
Author:
Summary:
The overpressure protection system of a fully automatic wet‑spraying carriage is a critical component for ensuring safe equipment operation. By implementing multiple protective measures, it prevents hydraulic system pressure from exceeding allowable limits, thereby averting equipment damage and potential safety incidents. Modern wet‑spraying carriages employ a hierarchical protection strategy, establishing a comprehensive overpressure safeguarding framework.
I. Mechanical Overpressure Protection Device
Main relief valve protection
The system’s first line of defense:
1. The main relief valve is directly mounted on the pump’s discharge line.
2. The set pressure is the system’s rated working pressure. 110%
3. It adopts a pilot-operated structure, with a response time of less than 50 Millisecond
4. Equipped with a pressure‑adjustment locking mechanism to prevent accidental adjustments.
Safety Valve Assembly Configuration
Independent protection for critical components:
Each major actuation circuit is equipped with an independent safety valve.
The boom system’s relief valve is set at a pressure lower than that of the main system.
The outrigger hydraulic circuit is equipped with a dedicated safety protection system.
The rotary mechanism is equipped with an overload protection valve.
II. Electronic Control System Protection
Pressure sensor monitoring
Real-time Pressure Monitoring Network:
Dual pressure sensors are installed at the main pump outlet.
Inlet pressure monitoring for each actuator
Pilot Control System Pressure Monitoring
Return Oil Backpressure Monitoring
Intelligent Pressure Limiting
Electronic Pressure Control Strategy:
1. Software pressure limit: Set a pressure threshold in the control program.
2. Pressure Gradient Control: Limits the Rate of Pressure Rise
3. Pressure Predictive Control: Pressure Trend Prediction Based on Load Forecasting
4. Automatic pressure reduction function: Automatically reduces flow rate when overpressure occurs.
III. Hydraulic System Design and Protection
System Volume Optimization
Hydraulic Chamber Design Protection:
Properly design the pipeline volume to minimize pressure surges.
Install accumulators at locations prone to impact.
Optimize the volume ratio of the actuator.
Control the effects of fluid compressibility
Buffer device installation
Buffered protection for moving parts:
1. Cylinder end buffer device
2. Motor braking and cushioning valve assembly
3. Optimization of the neutral position function of directional control valves
4. Actuator soft-stop function
IV. Operational Process Protection
Access Permission Management
Classified operating pressure limits:
Beginner Mode: Pressure Limited to Rated Value 80%
Standard mode: Allows reaching the rated pressure.
Expert Mode: Allows for moderate overpressure under monitoring.
Maintenance Mode: Special Permission for Stress Testing
Action interlock protection
Operational Logic Protection:
1. Multi-action interlocking prevents pressure buildup.
2. Automatic pressure relief at the limit position
3. Automatic adjustment during sudden load changes
4. Automatic intervention for abnormal operations
V. Emergency Response System
Automatic Emergency Response
Overpressure Automatic Handling Procedure:
Pressure reaches 105% Alarm at rated value
Pressure reaches 110% Automatically reduces displacement when necessary.
Pressure reaches 115% System unloading at the time
Continuous overpressure triggers an emergency shutdown.
Manual Emergency Procedures
Manual intervention protection:
1. The emergency stop button directly discharges the load.
2. Emergency Operation of the Manual Relief Valve
3. Forced derating operation
4. System Isolation and Protection
VI. Monitoring and Early Warning System
Real-time status display
Pressure Monitoring Interface:
The display shows the real-time pressure value.
The pressure trend curve shows
Set pressure threshold display
Automatic conversion of pressure units
Early Warning System
Tiered Early Warning Mechanism:
1. Audio alert: Pressure exceeds 90% Time prompt
2. Optical alarm: Pressure exceeds 95% Flashing at times
3. Text alarm: Pressure exceeds 100% Display time
4. Forced intervention: Pressure exceeds 110% Automatic processing at the time
VII. Maintenance and Inspection Requirements
Regular Verification System
Reliability Assurance of Protective Devices:
Check the relief valve setpoint monthly.
Quarterly verification of pressure sensor accuracy
Six-month test of the safety valve’s functionality
Annual Comprehensive Systemic Stress Test
Preventive maintenance
System Reliability Maintenance:
1. Regularly replace the pressure gauge.
2. Cleaning the pressure sensor
3. Check the accumulator pressure.
4. Test the electrical protection circuit
Conclusion
The overpressure protection system of the fully automatic wet‑spraying carriage is a multi‑layered, all‑round safety mechanism that, through the coordinated operation of mechanical, electrical, hydraulic, and control systems, ensures the equipment’s safe operation under various operating conditions. It is recommended to establish a comprehensive overpressure protection management regime, conduct regular functional tests of the protective devices, and strengthen operator training to ensure that each safeguard can reliably perform as required. At the same time, continuous improvement of the protection system should be prioritized, with timely updates to technical solutions, thereby providing even more robust assurance for the safe operation of the equipment.
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Changsha Base:Hunan Zenxon Heavy Industry Technology Co., Ltd.
Address: Jinrong Tongxin International Industrial Park, Changsha High-tech Zone
Loudi Base:Hunan Haoda Heavy Industry Technology Co., Ltd.
Address: Loudi Avenue, Loudi High-tech Industrial Development Zone, Lianyuan City, Loudi City, Hunan Province
Telephone:400-186-0868
E-mail:3804246750@qq.com
E-mail:19967177733@163.com
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