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Analysis of Possible Causes for Weak Pumping Performance in Wet Spraying Boom Pumps
Release time:
2026-03-10
Source:
Author:
Summary:
Insufficient pumping capacity is a common malfunction in wet spray rigs, characterized by inadequate pumping pressure and reduced flow rate, which severely affects construction efficiency. To accurately diagnose the cause of insufficient pumping capacity, it is necessary to systematically analyze the operational status of the hydraulic system, the pumping mechanism, and the control system.
I. Hydraulic System Factors
Hydraulic pump efficiency declines.
Signs of hydraulic pump performance degradation:
1. The clearance between the plunger and the cylinder block is too large, resulting in reduced volumetric efficiency.
2. Wear on the distribution plate causes leakage from the high-pressure zone into the low-pressure zone.
3. The variable mechanism responds slowly and cannot establish pressure in a timely manner.
4. Bearing wear leads to a decrease in transmission efficiency.
Insufficient system pressure
Reasons for the abnormality in pressure buildup:
The main relief valve is set at too low a pressure, or the spring is fatigued.
The unloading valve is stuck in the open position.
The pressure compensator is malfunctioning.
The system has severe internal or external leakage.
II. Issues with the Pumping Mechanism
Sealing system failure
Leakage at the main sealing areas:
The sealing between the delivery cylinder and the piston is worn, causing concrete slurry to flow backward.
Damage to the sealing surfaces of the wear plate and cutting ring
S Failure of valve, pipe, and bearing seals
The seals at the pipe joints are not tight.
Excessive wear of components
The impact of wear on critical components:
1. The inner diameter of the delivery cylinder has exceeded the wear limit (typically > 2mm )
2. Piston head diameter wear reduction
3. Deep grooves appear on the sealing surface of the glass plate.
4. Cutting ring blade edge wear and deformation
III. Control System Failure
Electrical control system malfunction
Control signal transmission issue:
Pressure sensor signal drift
Proportional solenoid valve response delay
PLC Control program error
Poor electrical connection contact
Improper parameter settings
System parameter setting issue:
1. Pump displacement setpoint is too low.
2. The pressure limit parameter is set too low.
3. The commutation buffer time is too long.
4. The system protection parameters are too sensitive.
IV. Oil Fluid and Filtration System
Hydraulic oil issue
Oil fluid performance does not meet standards:
The oil viscosity does not meet the requirements (standard). ISO VG46 )
Oil fluid contamination exceeds the standard (requirement) NAS 9 Within the grade)
High oil temperature leads to a decrease in viscosity.
Low oil level causes the pump to run dry.
Filter system malfunction
The filtration system is malfunctioning:
Pump cavitation caused by clogged oil filter element.
The high-pressure filter element is clogged, resulting in insufficient flow.
The return oil filter element is clogged, causing excessive back pressure.
The filter cartridge bypass valve, when left open permanently, loses its filtering function.
V. Operation and Maintenance Factors
Improper operation
The impact of non-standard operations:
Prolonged operation under overload conditions
Frequent emergency stops and starts
The pumping speed is set unreasonably.
Ignore device anomaly alerts
Maintenance is inadequate.
Lack of maintenance and upkeep:
1. Worn parts not replaced on schedule
2. Lubrication system maintenance is not performed in a timely manner.
3. Filter cartridge used beyond its service life.
4. System cleanliness control is not strict.
VI. Impact of External Factors
Concrete Properties
The impact of material properties:
The concrete slump does not meet the requirements.
Aggregates with excessively large particle size or poor gradation.
The mix design is unreasonable.
Poor material workability
Environmental conditions
Work environment impact:
The ambient temperature is too high or too low.
Altitude changes affect system pressure.
Humidity affects electrical systems.
Dust pollution is severe.
7. Diagnosis and Treatment Methods
Systematic diagnosis
Troubleshooting steps:
1. Check the system pressure build-up situation.
2. Test the volumetric efficiency of the hydraulic pump
3. Detect system leakage.
4. Analyze oil contamination levels
Targeted handling
Take corresponding measures based on the cause:
Replace the worn hydraulic pump components.
Adjust or replace the control valve assembly.
Repair or replace the sealing components.
Optimize system operating parameters
Conclusion
Addressing the issue of insufficient pumping capacity in wet spray trucks requires systematic analysis and comprehensive handling. By establishing a well-rounded equipment maintenance system, strictly adhering to operating procedures, and strengthening equipment condition monitoring, we can effectively prevent and promptly address such failures. It is recommended to develop a detailed equipment maintenance plan, equip with necessary inspection devices, and enhance technical personnel training to ensure that equipment consistently remains in optimal working condition. At the same time, it is crucial to focus on collecting and analyzing failure data, continuously improving equipment management levels, and providing reliable support for construction 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
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