1,Attention to the discovery of abnormal phenomena at any time
Abnormal sound, vibration or monitoring system abnormal signals, there must be a reason, an abnormal phenomenon found, need to immediately find back and forth road map, find the reason for the appearance of anomalies, to assess whether the need to stop work to deal with.
2,Do not add the load immediately after the hydraulic pump startup
Hydraulic pumps must be implemented after the start of a period of no load idling (about 10 minutes ~ 30 minutes), especially when the temperature is very low, more need to be warmed up by the process of the car, so that the hydraulic circuit cycle is normal and then added to the load, and to confirm the operating conditions.
3,Observe the oil temperature change
Pay attention to check the maximum and minimum oil temperature changes and oil temperature and the relationship between the external ambient temperature, clear cooler capacity, oil storage tank capacity and surrounding conditions, the use of conditions with each other, to ensure that the cooling system troubleshooting traceable.
4, pay attention to the noise of the hydraulic pump
The new hydraulic pump initial wear less, easy to be affected by bubbles and dust, high temperature when poor lubrication or use conditions overload, etc., will cause adverse consequences, so that the hydraulic pump sends out abnormal effects.
5, pay attention to check the meter class display value
Observe at any time the hydraulic circuit of the pressure gauge display value, pressure switch signal lamp vibration situation stability, in order to find out as early as possible whether the role of the hydraulic circuit is normal.
6, pay attention to the adjustment of the valve
Fully understand the use of pressure control valves, flow control valves and directional control valves, the scope of adjustment and the limit of special attention must be paid to, otherwise the adjustment error not only damage to the machinery, but also pose a threat to safety.
7,Check the status of the filter
The filter in the circuit should be taken out regularly to clean up, and check the state of the filter and its adsorption of dirt, analyze the quality, quantity and size, know the circuit, clear pollution sources.
8,Check the change of hydraulic oil regularly
Every 1~2 months to check and analyze the hydraulic oil deterioration, discoloration and pollution degree of change, in order to ensure the normal hydraulic transmission medium.
9, pay attention to the piping part of the leakage
Whether the hydraulic device piping is good or not can be seen after running for a period of time, check whether there is oil leakage and whether the piping is loose.
10, the new machine should pay attention to the operating conditions within three months of operation
In the new machine running period, should grasp the running condition check, such as the maintenance of machine parts, screws are loose, oil temperature is not normal rise, hydraulic oil is quickly deteriorate, check whether the use of conditions in line with the provisions.
11,Causes of mechanical losses
①. Hydraulic pump work, the relative moving parts, such as bearings and shafts, shafts and seals between the vane and the inner wall of the pump body between the mechanical friction, resulting in frictional resistance loss. This loss is related to the output pressure of the hydraulic pump, the higher the output pressure, the greater the frictional resistance loss.
②. Fluid flow in the pump, due to the viscosity of the liquid and viscous resistance, will also cause mechanical losses. This loss is related to the viscosity of the fluid, the pump speed, the more viscous the fluid, the higher the speed of the pump, the greater the mechanical loss.
For these reasons, the actual input power of the pump is greater than the theoretical power required. Theoretical input power of the hydraulic pump and the actual input power ratio is called mechanical efficiency, which indicates the degree of power loss. Hydraulic pump output power and input power ratio is called the total efficiency of the hydraulic pump.
12. Causes of volume loss
①. Volumetric hydraulic pump suction chamber and discharge chamber in the pump, although separated, but the relative movement with a certain gap always exists, so the pump in the high-pressure area of the oil through the gap is bound to leak to the low-pressure area. The lower the viscosity of the hydraulic fluid, the higher the pressure, the greater the leakage.
②. Hydraulic pump in the suction process, due to suction resistance is too large, the oil is too viscous or pump shaft speed is too high reasons will cause the pump suction empty phenomenon, so that the sealing of the working volume can not be filled with oil, that is to say, the working chamber of the hydraulic pump is not fully utilized.
