1、 Daily maintenance (after each test)
1. Thoroughly clean:
Shutdown operation: Ensure that the testing machine has been completely powered off and depressurized.
Clear debris: Use a copper or nylon brush to carefully remove all metal debris, oxides, and dust from the jaw teeth, sliding parts, and base. It is strictly prohibited to use steel brushes to avoid
scratching the teeth surface of the quenched jaws.
Blow off: Use compressed air or an ear wash ball to blow away debris from gaps that are difficult for the brush to reach.
Wiping: Use a clean cotton or silk cloth to wipe the surface of the jaws. If necessary, dip a small amount of anhydrous ethanol (alcohol) for cleaning, and wait for it to completely evaporate before
proceeding with subsequent operations.
2. Check the jaws:
Visual inspection: Check for any damage, cracks, or severe wear on the jaw teeth (rounded tooth tips).
Simple test: Hold an abandoned sample and observe whether sufficient clamping force can still be generated and whether there is any obvious slipping phenomenon.
2、 Regular maintenance (based on usage frequency, weekly or monthly)
1. Lubrication:
Lubrication parts: mainly lubricate the sliding slope of the jaw, the sliding block in contact with the jaw seat, and the lifting screw.
Lubricant selection: Use high-quality lithium based grease or specific grease recommended by the equipment manufacturer. For high-speed or high-temperature environments, it is necessary to
choose corresponding high-temperature resistant and extreme pressure lubricating grease.
Operation method: Remove old and contaminated grease, and then evenly apply a layer of new lubricating grease. Be careful not to overdo it to prevent grease from contaminating the sample or
entering the hydraulic system.
Rust prevention: A thin layer of rust prevention oil can be applied to the cleaned metal surface (non clamping surface), especially in humid environments.
2. Functional examination:
Check clamping force: Observe whether the hydraulic system pressure is normal during the test, and whether there is insufficient clamping force or "inability to clamp" in the jaws.
Check the alignment: Use a standard sample to check the alignment of the upper and lower jaws. If the sample shows abnormal bending or does not break in the middle position after fracture, it
may indicate poor alignment and requires contacting the manufacturer or professional for calibration.
Check the hydraulic system: Check for leaks, abnormal vibrations, or noise in the hydraulic cylinders and oil pipe joints related to the fixture.
3、 Long term storage and special maintenance
1. Long term storage:
Thorough cleaning and rust prevention treatment must be carried out.
Apply rust proof oil to all metal surfaces.
Remove the jaws from the machine and store them in a dedicated box or dry environment to avoid collision with other metal parts.
The storage environment should be kept dry, clean, and free of corrosive gases.
2. Jaw replacement:
When to replace: When the wear of the clamp teeth exceeds 1/3, or when there are broken teeth or cracks, causing frequent slipping and unstable clamping, it must be replaced immediately.
Paired replacement: It is recommended to replace the upper and lower jaws in pairs to ensure the best clamping effect and alignment.
Model matching: Ensure that the model and specifications of the new jaw are perfectly matched with the testing machine and jaw seat.
4、 Safety operation standards (core of preventive maintenance)
1. Choose the correct jaw: Select the matching jaw based on the shape (round, flat, threaded) and size of the sample. Do not forcefully clamp large samples with small jaws.
2. Sample clamping length: Ensure that the sample has sufficient length to be clamped in the jaws, generally requiring clamping at least 2/3 of the total length of the jaws.
3. Place the sample in the center: Try to place the sample in the center position of the clamp to avoid biased loading.
4. Smooth application of force: First, lightly pre tighten the sample to make it preliminarily aligned, and then apply the specified clamping force. Avoid sudden application of huge impact force.
5. Keep clean: Before clamping the sample, ensure that the clamping area and jaw teeth are clean and free of oil stains and foreign objects.
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