Maintenance and upkeep procedures for electric quadruple direct shear tester

1、 Daily maintenance

Cleaning after the experiment

Remove residual soil samples from the cutting box and use a soft bristled brush to clean the pores of the permeable stone

Wipe the contact surface of the shear box with anhydrous ethanol (corrosive solvents are prohibited)

Check the integrity of the filter paper, every test5Replace the filter paper with a new one

Transmission system inspection

Check the lubrication status of the ball screw (replenish lithium based grease every month)

Confirm that the guide rail has no scratches (roughness)Ra≤0.8Mm）

Manually push the shear box and check the movement resistance (should be≤5N）

sensor calibration

Perform zero point calibration of the force sensor during daily startup (in an unloaded state)

Calibration of displacement sensors using standard gauge blocks（≤0.01mm）

2、 Zhou Maintenance

Key component inspection

Measure the flatness of the shear box (using0.02mmGauge detection, gap ≤0.05mm）

Check the permeability of permeable stones (water injection rate should be≥10mL/min）

Test motor torque (rated value)±5%Within the scope)

Electrical system testing

Check the tightness (torque) of the wiring terminals0.5N·m）

Measure the grounding resistance（≤4Ω)

3、 Monthly maintenance

System performance testing

Conduct no-load operation test (speed)0.01-2.4mm/minNo lag throughout the entire process

Calibration of standard weights vertically/Shear force sensor (≤0.5%FS）

Check the data collection system (sampling frequency)≥10Hz）

mechanical adjustment

Adjust the tension (deflection) of the drive belt3-5mm/10NPressure)

Replace worn guide bearings (cumulative operation)500After hours)

4、 Annual major maintenance

Comprehensive dismantling and inspection

Replace all sealing rings (mandatory replacement cycle for nitrile rubber parts)1Year)

Check the gearbox gear oil（ISO VG220, replacement cycle2000Hour)

System calibration

Entrust a measuring unit to calibrate the entire machine (issue)CMACertification Report

Update control software (compatible with the latest geotechnical testing standards)

5、 Key Maintenance Parameter Table

component Maintain indicators standard value testing tool

Cutting box flatness ≤0.05mm Optical flat crystal

force sensor nonlinear， ≤0.3%FS standard weight

displacement sensor repetitiveness， ≤0.01mm dial indicator

motor temperature rise ≤65℃ (continuous)4h） Infrared Thermometer

6、 Common fault handling

Abnormal shear force

Phenomenon: The test value is too small20%above

Processing procedure:

Check the wiring of the sensor

Calibration force value system

Check the fixing bolts of the shear box (torque)15N·m）

Displacement stuck

Phenomenon: Unstable movement speed

Processing procedure:

Clean the guide rail and add lubricating oil

Check the concentricity of the coupling（≤0.02mm）

Test the output current of the motor driver

Data jump

Phenomenon: Peak appears in the collection curve

Processing procedure:

Check the grounding system

Replace the shielded signal cable

Update the filtering parameters of the acquisition software

7、 Safety precautions

Electrical safety

Before maintenance, the power must be cut off (voltage test)≤36V）

Capacitor discharge time≥3minute

Mechanical safety

Hands are prohibited from entering when the cutting box is moving (safe distance)50mm）

The maximum vertical load shall not exceed the rated value (usually50kPa）

Environmental Requirements

Storage temperature10-35℃

relative humidity30-70%RH