Permanent fault classification of hydraulic pump

The failure of hydraulic pump components can be divided into many categories, of which permanent faults have the greatest impact on the equipment, but also the most durable. At present, the solution to this problem is mainly the maintenance and replacement of hydraulic pumps. The following is the classification and manifestation of common permanent faults.

1. Classification according to the degree of function loss caused by failure;

Complete failure: the failure of equipment completely lost function; for example, the main shaft of the hydraulic pump of the walking machine is completely broken or the key is completely worn out of transmission, resulting in the hydraulic pump without pressure oil output, then the function of the equipment is completely lost.

Partial failure: the failure of some local functions of the equipment; for example, when the vibration system of the paver fails, the vibrating function is lost; however, the paver can still carry out the paving operation and can pave the road without using vibration.

2, fault specific performance:

Destructive fault: both sudden fault and complete fault; for example, the sudden damage of the components in the hydraulic pump, resulting in the fracture of the plunger and other components, resulting in damage to the hydraulic pump, so that the equipment must completely stop working, repair.

Progressive failure: both partial and gradual failures; we know that the normal wear cycle of mechanical components or hydraulic components is predictable, part of the damage makes the equipment efficiency decline, part of the function lost.

3, according to the cause of the fault classification:

Wear fault: design can be expected, belongs to the normal wear caused by the failure; for example, the normal wear of hydraulic pumps can be through a certain maintenance means to extend the wear cycle, such as we use a higher precision filter device to improve the cleanliness of hydraulic oil.

Misuse fault: because when using numerical rules load, pressure and flow rate did not exceed the design, but the prescribed value itself is not adapt to the actual situation, this is not a reasonable design and lead to the emergence of applause.

4, according to the speed of fault classification;

Sudden fault: we can not predict the fault ahead; for example, the high-pressure pipe of hydraulic system suddenly burst, all the pressure loss, the equipment can not work, this is the unexpected fault that we can not predict.

Progressive faults: by analyzing and testing the faults that can be predicted ahead of time, that is, there is a process of failure. For example, the gear inside the reducer wear, the degree of wear is gradually increasing, we can in a certain period of time to maintain it, and we can predict the cycle of gear damage.

5, according to the classification of the risk of failure:

According to the degree of occurrence of fault classification: very easy to happen, easy to happen, occasionally, rarely happen.

Safety fault: refers to the equipment failure, there is no danger; for example, when starting hydraulic equipment, can not drive the operation of the fault;

According to the emergency classification of the fault: need to be ruled out immediately, as soon as possible ruled out, can be slowly ruled out and unrestricted fault.

According to the influence degree of the fault classification: such as catastrophic, short circuit, after the fire, causing the plane crash; the severity of the hydraulic pump, internal damage, resulting in complete pollution system; for example, not serious, wear of the hydraulic pump, resulting in leakage, the device is not working properly; minor, hydraulic system oil leakage.

Dangerous failure: refers to the equipment in the failure and damage of the component form of debris flying or high pressure oil splash, serious damage of equipment, hydraulic failure and even casualties; such as safety overflow protection system failure in need of action, system of ultra high voltage operation, causing explosion phenomena such as tubing.

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