Introduction to common failures of hydraulic universal material testing machine
1. The reason why the piston does not rise:
1. The motor is reversed; 2. The oil delivery valve is not opened or the oil return valve is not tightened; 3 The oil delivery piston is ground to death
Elimination method for piston not rising: www.lyxyantech.com
1. Exchange the three-phase power wiring; 2. Close the oil return valve and open the oil delivery valve; 3. Repair or replace parts
2. Reasons for unstable oil delivery of the oil pump:
1. There is air in the oil circuit; 2. The viscosity of the oil is too high or too thin or too dirty; 3. There is leakage
Elimination method of unstable oil delivery of oil pump:
1. Repeatedly drive up and down the piston; 2. Replace hydraulic oil with suitable viscosity; 3. Find out the leaking oil and remove it
3. Reasons for the oil pressure not reaching the maximum load:
1. The buffer piston is dead or there is dirt; 2 the oil viscosity is not enough; 3. There is oil leakage; 4. The oil return switch lever does not match the valve port www.lyxyantech.com
Elimination method for oil pressure not reaching the maximum load:
1. Clean or grind corresponding parts; 2. Replace hydraulic oil with higher viscosity; 3. Eliminate oil leakage; 4. Grind and tighten the oil return needle
Fourth, the reason why the oil pump does not start:
1. The piston limit switch is not closed; 2. The overload protection switch is not closed
Elimination method of oil pump not starting: www.lyxyantech.com
1. Check the piston limit switch; 2. Check the connection plug
5. Reasons for pointer jitter:
1. The oil pump does not suck oil smoothly; 2. The air in the hydraulic system; 3. Insufficient oil supply
How to eliminate pointer jitter:
1. Use the tool hook to move the one-way valve spring to work; 2. Loosen the air screw to release the air; 3 Load 80% of the full load with oil pressure and cycle several times
6. Reasons for intermittent pointers:
1. Dust and dirt on copper wheels, aluminum rods or slides; 2. The bearing does not work well
Elimination method of intermittent pointer: www.lyxyantech.com
1. Clean and remove dust; 2. Clean and remove dust and replace bearings
Seven, the serious reasons for the out-of-error indication:
1. The installation is not level; 2. There is friction in the guiding and lifting parts
Exclusion method for serious indication value out of tolerance:
1. Adjust the installation level of the host and dynamometer; 2. Eliminate friction
8. Reasons for lifting failure:
1. Circuit failure; 2. Mechanical transmission failure
Elimination method of lifting failure:
1. Check the power connection line; 2. Check and repair the gap of the chain drive pair
9. Reasons for failure of hydraulic clamping:
1. Hydraulic system failure; 2. Mechanical part failure
Elimination method of hydraulic clamping failure:
1. Troubleshoot the hydraulic system; 2. Troubleshoot the mechanical part
10. Reasons for leakage of hydraulic system:
1. The hydraulic system joint is loose; 2. The seal is damaged and invalid www.lyxyantech.com
Elimination method of hydraulic system leakage:
1. Fasten the joint; 2. Replace the seal
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