What issues should be paid attention to when maintaining a hydraulic universal testing machine?

Hydraulic universal testing machine is mainly used for mechanical properties tests such as tensile, compression, bending, etc. of metal materials, non-metallic materials, product parts, components, structural parts, and standard parts. So what are the issues that need to be paid attention to when maintaining a hydraulic universal testing machine? Let’s take a look with the editor below!

1. Cleaning and hygiene: During the test, some dust will inevitably occur, such as oxide scales, metal debris, etc. If it is not cleaned in time, it will not only wear and scratch the surface of certain parts, but more severely, if these dust enters the hydraulic system of the electro-hydraulic servo universal test machine, it will cause severe results such as blocking the valve hole and scratching the piston surface. Therefore, cleaning after each use is very important, and you must insist on the hygiene of the experimental machine;

2. Use appropriate fixtures to complete the corresponding test, otherwise the test will not be very successful, but also damage the fixture: the electro-hydraulic servo universal test machine is usually only equipped with fixtures for standardized samples. If you want to make non-standard samples, such as steel strands, overlapping steel fines, etc., you must add appropriate fixtures; there are also some super hardness data, such as spring steel, etc., and special clips must be used, otherwise the fixtures will be damaged;

3. Hydraulic oil: You must check the fluid level of the oil tank frequently and replenish oil in time; you must change the oil every 2000 to 4000 hours; but the most important thing is that the oil temperature must not exceed 70℃, and the cooling system must be turned on when the oil temperature exceeds 60℃;

4. Filter: For filters without blocking indicators, they usually need to be replaced every 6 months. Regarding filters with blocking indicators, continuous supervision must be carried out and must be replaced immediately after the indicator alarms;

5. Accumulator: Some electro-hydraulic servo universal testing machines are equipped with accumulators, which must ensure that the pressure of the accumulator is in a normal task. If the pressure is found to be insufficient, the pressure needs to be compensated immediately; only nitrogen is allowed to be charged to the accumulator;

6. Regular inspection of components: All pressure control valves, flow control valves, pump regulators, and signal equipment such as pressure relays, stroke switches, thermal relays must be checked regularly;

7. Cooler: The scale accumulation of air-cooled coolers should be regularly sorted out; if water-cooled coolers are selected, the cooling copper pipe should be regularly checked for the appearance of cracking and leakage;

8. Lubricating oil: Lubricating oil should be applied regularly on the lead screw and transmission of the electro-hydraulic servo universal testing machine to avoid dry conflicts; 9. The fasteners of the electro-hydraulic servo universal testing machine must be locked regularly: the oscillation after the sample is broken often causes some fasteners to loosen, and it is necessary to conduct regular inspections (about 30 task days for normal use) to avoid major losses due to loose fasteners.

10. Other Views: Be alert and pay close attention to details, so that you can detect signs of events early and avoid major events. This is especially true when the equipment starts to operate. Pay attention to leaks, pollutants, component damage, and abnormal noise from pumps, couplings, etc.