搜索历史清除全部记录
- All
- Product Management
- News
- Introduction
- Enterprise outlets
- FAQ
- Enterprise Video
- Enterprise Atlas
Method for Testing the Sealing Performance of Hydraulic Cylinders in Truck-Mounted Concrete Pumps
Release time:
2026-05-14
Source:
Author:
Summary:
Seal integrity of hydraulic cylinders is a critical parameter for ensuring the proper operation of concrete truck-mounted pumps. Degraded sealing performance can lead to insufficient pressure, sluggish actuation, and increased energy consumption. Systematic seal integrity testing enables the timely identification of potential hazards, thereby preventing equipment failures.
I. Visual Inspection and Preliminary Assessment
External Leak Check
External leakage detected through visual inspection:
1. Inspect the piston rod surface for oil film or oil droplets.
2. Inspect the cylinder barrel welds and connections for leaks.
3. Check whether the dust seal is intact.
4. Pay attention to the oil traces around the guide sleeve.
Operational Status Monitoring
Abnormal symptoms during equipment operation:
The piston rod’s speed has decreased significantly.
System pressure cannot reach the set value.
Abnormal fluctuations in pumping displacement
The hydraulic oil temperature is rising more rapidly.
II. Pressure Retention Test
Static Pressure Test
Seal integrity testing in the shutdown state:
1. Extend the hydraulic cylinder piston rod to the midpoint of its stroke.
2. Apply the rated pressure to the rodless chamber and the rod chamber, respectively.
3. Record the rate and duration of pressure decline.
4. Standard requirements: 10 The pressure shall not drop by more than within minutes. 5%
Dynamic Pressure Testing
Pressure monitoring during operation:
Record pressure fluctuations under different operating pressures.
Observe the oscillation of the pressure gauge pointer.
Pressure Build-Up Time for Testing
Analysis of the Relationship Between Pressure and Flow
III. Internal Leakage Detection Methods
Settlement Measurement
Determining internal leakage by piston rod displacement:
Extend the piston rod and apply load to the rated pressure.
Measure the piston rod retraction distance within a specified time.
Standard value: The hourly settlement shall not exceed the diameter of the piston rod. 1%
Record the test environment temperature
Flow Comparison Method
Precise measurement of internal leakage:
1. Install a flow meter in the hydraulic cylinder return line.
2. Measure the return oil flow for the rod-side and rodless-side chambers separately.
3. Calculate the difference in internal leakage.
4. Comparison with the standard allowable value
IV. Professional Instrumental Testing
Ultrasonic Testing
Using ultrasonic detection for internal leaks:
Detecting leakage sound waves using ultrasonic sensors
Analysis of acoustic wave frequency and intensity characteristics
Locate the specific position of the leak.
Assess the severity of the leak
Thermal Imaging Inspection
Applications of infrared thermal imagers:
1. Capturing the thermal distribution map during hydraulic cylinder operation
2. Analyze areas of abnormal temperature rise
3. Determine the location of seal failure
4. Establish the correlation between temperature and leakage.
V. Oil Analysis and Testing
Oil Contamination Analysis
Assessing seal condition through fluid analysis:
Detecting the metal particle content in lubricating oil
Analysis of Seal Wear Debris
Monitor the cleanliness level of hydraulic fluid
Standard requirements: NAS 8 Within the level
Fluid Performance Testing
Lubricant physicochemical property analysis:
1. Viscosity Change Detection
2. Degree of increase in acid value
3. Moisture Content Determination
4. Oxidation Degree Assessment
VI. Periodic Inspection Plan
Daily Inspection
Mandatory inspection items for each class:
Visual inspection for external leaks
Record oil level changes
Monitor for abnormal sounds
Check the oil color
Regular inspection
Systematic Testing Arrangement:
1. Conduct a stress retention test weekly.
2. Conduct settlement monitoring monthly.
3. Quarterly oil sample analysis
4. Annual Comprehensive Performance Testing
VII. Processing of Test Data
Testing Record Requirements
Standard record content:
Testing Time and Environmental Conditions
Use of Instruments and Test Methods
Test Data and Phenomenon Description
Detailed Record of Abnormal Conditions
Data Analysis Methods
Scientific analysis of the test results:
1. Establish historical data comparison
2. Analyze performance trend changes
3. Set the alert threshold
4. Formulate maintenance decisions
Conclusion
Seal integrity testing of the hydraulic cylinders in concrete truck-mounted pumps is a critical component of equipment maintenance. By establishing a systematic testing regime and employing scientifically sound testing methods, the sealing condition of the hydraulic cylinders can be accurately assessed. It is recommended to develop detailed testing procedures, equip the facility with the necessary testing equipment, enhance training for testing personnel, and maintain comprehensive testing records. Standardized testing management enables the timely identification of potential sealing defects, helps prevent equipment failures, ensures that the equipment remains in optimal working condition, and provides reliable assurance for construction operations.
RELATED INFORMATION
Contact Us
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
0
Consult now
WeChat Public Number
TikTok