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Identification and Handling of Abnormal Pumping Pressure in Wet Spray Trucks
Release time:
2026-02-12
Source:
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Summary:
Pumping pressure is an important indicator of the operational status of wet spray trucks, and abnormal pressure readings often serve as early warnings of equipment malfunctions. Accurately identifying the type of pressure anomaly and taking timely corrective measures are crucial for ensuring both equipment safety and construction quality. This article systematically outlines methods for diagnosing and handling abnormal pumping pressures.
I. Basic Types of Pressure Abnormalities
Overpressure
The primary manifestation is sustained working pressure exceeding the normal range, typically accompanied by the following phenomena: the main system pressure reading exceeds the rated working pressure; the motor or engine load increases significantly; hydraulic oil temperature rises rapidly; and the equipment exhibits abnormal vibration or noise.
Pressure too low
Work pressure fails to meet normal operational requirements: The pumping system’s pressure builds up slowly; the actuator movements are weak; the concrete delivery rate has noticeably decreased; and the amplitude of system pressure fluctuations has increased.
Pressure fluctuation
The pressure reading is unstable, showing periodic or random fluctuations: the pressure gauge pointer swings violently; the pumping rhythm is irregular; the equipment’s operating sound varies between loud and soft; and the concrete discharge is uneven.
II. On-site Judgment Methods
Instrument monitoring
Make a preliminary judgment by observing the pressure reading: Under normal operating conditions, the pressure should be within the range of 8–20 MPa; the pressure fluctuation amplitude should not exceed ±2 MPa; and the rate of pressure change should be smooth.
Voice recognition
Use the sound of equipment operation to aid in diagnosis: When pressure is too high, it’s typically accompanied by a dull rumbling noise; when pressure is too low, you may hear an empty, suction-like sound; and when pressure fluctuates, the sound exhibits periodic changes.
Action observation
Based on the operational status of the actuator: abnormal boom movement speed; irregular pumping rhythm; intermittent concrete discharge.
III. Analysis of the Causes of Pressure Anomalies
The main causes of excessive stress
1. Pipe blockage or excessive bends
2. Improper concrete mix proportion
3. The hydraulic system relief valve is set too high.
4. Valve spool sticking caused by oil contamination
The main causes of excessively low pressure
1. Severe internal leakage in the hydraulic pump
2. The system has external leakage points.
3. The relief valve is set at too low a pressure.
4. The oil viscosity does not meet the requirements.
The main causes of pressure fluctuations
1. Air entering the hydraulic system
2. The pump’s flow rate adjustment is unstable.
3. The load changes are too drastic.
4. The control valve is malfunctioning.
4. Systematized Diagnostic Process
Preliminary examination
1. Check the hydraulic oil level and oil quality.
2. Confirm whether the system has any obvious leaks.
3. Check the filter clogging indicator.
4. Verify the accuracy of the pressure gauge.
Functional testing
1. Test the actions of each actuator.
2. Check the system unloading pressure
3. Verify the relief valve setpoint.
4. Test the volumetric efficiency of the pump
Specialized Testing
1. Hydraulic System Sealing Test
2. Pump and Motor Efficiency Testing
3. Analysis of Control Valve Response Characteristics
4. System Cleanliness Testing
V. Emergency Response Measures
Handling when pressure is too high
1. Immediately stop pumping operations.
2. Perform backflushing operations to attempt to clear the blockage.
3. Check and adjust the concrete mix ratio.
4. Troubleshoot hydraulic system faults
Handling when pressure is too low
1. Check and replenish the hydraulic oil.
2. Identify system leak points
3. Monitor the operating status of the hydraulic pump
4. Adjust the overflow valve setpoint.
Handling Pressure Fluctuations
1. Remove air from the system
2. Check the cleanliness of the oil.
3. Stabilize the external load
4. Inspect and maintain the control valve assembly
VI. Preventive Maintenance Recommendations
Daily maintenance
1. Regularly check the condition of the hydraulic oil.
2. Maintain system cleanliness
3. Replace the filter cartridge in a timely manner.
4. Regularly calibrate pressure gauges.
Regular maintenance
1. Replace the hydraulic oil every 500 hours.
2. Check the system pressure every 1,000 hours.
3. Inspect the hydraulic pump every 2,000 hours.
4. Regularly clean the hydraulic system.
Monitoring and Early Warning
1. Establish a pressure monitoring record
2. Set the pressure alarm threshold
3. Conduct trend analysis
4. Establish an early warning mechanism
Conclusion
Accurately identifying abnormal pumping pressures in wet spray trucks requires operators to possess systematic professional knowledge and extensive practical experience. By establishing a comprehensive monitoring system and strictly enforcing maintenance and upkeep procedures, we can effectively prevent the occurrence of pressure abnormalities. At the same time, it is crucial to focus on developing operators’ abilities to identify faults and handle emergencies, ensuring that they can promptly take the correct corrective measures whenever pressure abnormalities arise. It is recommended that construction units establish and improve equipment management systems, regularly organize technical training sessions, and continuously enhance their equipment management capabilities, thereby providing reliable assurance for the smooth implementation of engineering projects.
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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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