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Cangzhou Nanhua Experimental Instrument Co., Ltd
The golden rule for daily maintenance of a 200 ton concrete pressure testing machine
Date: 2025-09-22Read: 1
200 ton concrete pressure testing machineIt is the core equipment for quality inspection of construction projects. Through a hydraulic system, axial pressure (with a large load of 2000kN and an accuracy of ± 1%) is applied to concrete test blocks (standard sizes of 150 × 150 × 150mm or 100 × 100 × 100mm) to determine their compressive strength (such as C30 concrete standard strength ≥ 30MPa), providing key data support for structural design, material acceptance, and engineering acceptance. Its measurement accuracy and stability directly affect engineering safety. Following the following "golden rule" can extend equipment life (usually 10-15 years) and ensure testing reliability.
1、 Cleaning and rust prevention:
After each experiment, promptly clean the debris of the test block (especially the concrete residue between the pressure plate and the column), use a brush to clean the inside of the loading frame, and prevent debris from entering the gaps of the oil cylinder or sensor; Regularly (weekly) wipe the surfaces of the oil cylinder, piston, and guide rail with a soft cloth to remove the oil sludge generated by hydraulic oil oxidation (diluted with neutral cleaner and lightly wiped, steel wire ball scraping is prohibited). Check the anti rust layer (usually electroplated or sprayed) of metal components (such as columns, beams, and pressure plates). If rust spots are found (especially on the base in a humid environment), polish them with fine sandpaper and apply anti rust oil (such as lithium grease) to prevent rust from increasing the fit gap (affecting loading accuracy).
2、 Hydraulic system maintenance:
Hydraulic oil (usually 46 # anti-wear hydraulic oil) should be replaced every 6 months or accumulated 500 hours of operation (replace in advance when the oil quality turns black, contains impurities or exceeds the standard of moisture). When replacing, use a dedicated oil filter (accuracy ≤ 10 μ m) to filter and clean the inner wall of the oil tank (remove sediment). Check whether the oil pipe joints (such as the connection between the high-pressure hose and the oil pump or oil cylinder) are leaking oil (wipe the joints with white paper, tighten or replace the sealing ring if oil stains appear), and listen for any abnormal noise (such as cavitation or gear wear) when the oil pump is running (under no-load condition). If the noise is too loud, it may be due to internal wear of the oil pump (professional maintenance is required). Regularly check the oil level of the hydraulic oil (it should be above the centerline of the oil gauge). If the oil level is too low, it will cause the oil pump to empty (unstable pressure).
3、 Calibration of sensors and control systems:
The pressure sensor (with a range of 2000kN and an accuracy of 0.1% FS) should be calibrated every 3 months using a standard force gauge (such as a hydraulic standard force gauge), and the measured value should be compared with the standard value (if the error is greater than ± 1%, the amplifier gain should be adjusted or the sensor should be replaced); Check the linearity of the displacement sensor (measuring the deformation of the test block with an accuracy of ± 0.01mm) (verified by a standard displacement block, calibration is required for deviations>± 0.02mm). The loading rate of the control system (usually 0.5-0.8 MPa/s for concrete compression testing) needs to be adjusted through potentiometers or software parameter settings to ensure stable rate (fluctuation ≤ ± 5%), avoiding instantaneous damage to the test block caused by too fast loading (data distortion) or slow loading affecting efficiency.
4、 Mechanical component inspection:
The verticality of the columns and beams of the loading frame needs to be checked once a year (measured with a theodolite, deviation>± 1mm/m will affect the uniformity of the test block's stress), and nuts and bolts (such as fasteners connecting the pressure plate) should be tightened regularly with a torque wrench according to the standard value (usually ≥ 100N · m) to prevent loosening and uneven loading. Apply lithium based grease to the guide rail every six months (to reduce frictional resistance and avoid piston jamming) to ensure the piston moves in a straight line. Check the surface of the rail for scratches (if severe, replace the rail).
5、 Operating standards:
Before the experiment, check the placement position of the test block (it must be centered on the center of the pressure plate, eccentricity>10mm may cause lateral force damage to the sensor), and confirm that the limit switch (to prevent overload and overpressure, usually set to 2100kN) is functioning properly before loading; During the experiment, it is prohibited to adjust the loading rate or suddenly stop the machine (which may cause hydraulic shock and damage to the oil pump); Regularly train operators (familiar with the location of emergency stop buttons and emergency response procedures).
follow200 ton concrete pressure testing machineThe daily maintenance of the golden rule not only controls the measurement error within ± 1% (in accordance with the requirements of GB/T 3722-2011 "Hydraulic Universal Testing Machine"), but also builds a "data defense line" for the quality of construction projects, and is the "precision guardian" of structural safety inspection.