Year1
- 型号：
- JNZR
- 品牌：
- 中瑞
Product introduction of crane hydraulic oil pump accessories
Hydraulic oil pumps include vane pumps, gear pumps, plunger pumps and screw pumps. Generally used in the market are vane pumps, gear pumps and plunger pumps. The vane pump can be divided into variable vane pump, heat dissipation variable vane pump, variable vane pump with cooling pump and fixed vane pump. , The hydraulic oil pump body is small, light and easy to use, with high working pressure. . Single-stage pumping station: simple structure can obtain greater working pressure. 2. Double-stage pump station: When the pressure is low, the high and low pressure pumps supply oil at the same time to obtain a larger output flow. When the pressure is high, the low-pressure pump automatically returns oil without load through the unloading relief valve. Reduce power consumption. . Pressure maintaining function: When there is no leakage in the external oil circuit, the rated pressure will not drop more than the rated pressure drop after stopping the pump and maintaining pressure for minutes.
Fault analysis and solutions to the hydraulic oil pump of small crane
Fault 1: The hydraulic oil pump of small crane cannot absorb oil or has no pressure
Cause of failure: The crane coupling or shaft is broken or detached; .The oil supply pipeline from the oil tank to the hydraulic pump is broken or blocked
Troubleshooting method: Check whether the pump transmission is normal. Anhui Crane Rental stated: If the drive shaft is broken or the coupling is damaged, it must be removed and repaired or replaced if necessary; clean, repair or replace the oil line if necessary. Check whether all pipelines are tight and whether the manifold is cracked and installed correctly. .Repair or replace hydraulic pump. Drain, clean and refill system with recommended lubricant.
Fault 2: Pump noise (accompanied by foam in the fuel tank)
Cause of failure: Air intake in the suction pipe
Troubleshooting method: Anhui crane rental said: Check whether all pipelines are tightened and whether the manifold is cracked Is the installation correct? Tighten, repair or replace parts if necessary. The oil level in the fuel tank must be filled to the height mark on the dipstick.
Fault 3: Pressure pressure is too high
Cause of the fault: The setting value of the system load relief valve is too high; the pipeline between the pump and the control valve is blocked.
Troubleshooting method: clean, repair or replace the pipeline if necessary
How to replace the hydraulic oil pump of a small crane
The operator should pay attention to the discovery of abnormal phenomena of the small crane at any time: abnormal sound, vibration or monitoring system Abnormal signals, etc.
Do not add load immediately after starting the hydraulic pump: the hydraulic pump must idle for a period of time without load after starting. Especially when the temperature is very low, it must go through the warm-up process to allow the hydraulic circuit to circulate normally before adding load. and confirm the operating status.
Observe changes in oil temperature: Pay attention to the changes in oil temperature and find out the relationship between oil temperature and external ambient temperature.
Pay attention to the noise of the hydraulic pump: a new hydraulic pump has little initial wear and is easily affected by bubbles and dust. Poor lubrication at high temperatures or overloading under operating conditions will cause adverse consequences and cause the hydraulic pump to emit abnormal effects.
Pay attention to the operation of the machine (for modified pumps): Improper hydraulic circuit design or poor component manufacturing are not easy to find in the initial use stage, so special attention should be paid to the operation status under various usage conditions.
Pay attention to the adjustments in each valve: Fully understand the use of pressure control valves, flow control valves and directional control valves, and pay special attention to the adjustment range and limits. Otherwise, adjustment errors will not only damage the machinery but also pose a threat to safety.
Check the status of the filter: The filter in the loop should be taken out and cleaned regularly, and the status of the filter screen and the quality, quantity and size of the dirt adsorbed on the screen should be analyzed. This way, the degree of pollution in the loop can be observed and even based on this Deducing where the source of contamination is located.
Regularly check changes in hydraulic oil: Check and analyze changes in the degree of deterioration, discoloration and contamination of hydraulic oil every one or two months to ensure the normality of the hydraulic transmission medium.
Water will corrode the oil pump, so it is forbidden to use the oil pump to vacuum materials containing water. For materials containing a large amount of solvent, please first remove most of the solvent in the oven and then use an oil pump to vacuum. Use the small crane oil pump in the correct order to prevent back suction. After using the vacuum oven, be sure to clean the glass window of the vacuum oven. Wipe the anti-rust oil on the surface of the small crane oil pump. Remove the anti-rust oil from the inner cavity of the crane oil pump and add the specified brand of lubricating oil. The anti-rust oil in the hydraulic oil pipeline should also be removed before use. Connect the fuel to the injection pump pipeline and continuously rotate the main wheel shaft of the small crane oil pump until the oil outlet valve sprays clean hydraulic oil. Reasonable fuel selection. Hydraulic oil of the appropriate grade must be used. The hydraulic oil used must be clean and free of any impurities and moisture.
Comprehensive analysis of the reasons why the hydraulic system of small crane hydraulic oil pump cannot start
, small crane starting system factors
The starting system factors that affect the failure of the hydraulic system to start are mainly: battery factors and starting motor factors.
() Small crane battery factors
Insufficient battery power: Insufficient battery power will definitely lead to difficulty in starting the hydraulic system or failure to start. The basic phenomenon when the hydraulic system cannot start due to insufficient voltage and power is: after pressing the start button, the starter motor moves but the hydraulic pump basically does not rotate or has difficulty rotating. Troubleshooting method: Carefully check the battery charge or replace it.
b. Starting circuit failure: If there is a problem with the starting circuit, it may also cause the diesel engine to fail to start. Virtual connection - A virtual connection in the starting circuit cannot be discovered without careful inspection. At a glance, the circuit is intact, but the starting motor does not move; Broken line - It is impossible to start if the starting circuit is disconnected. The basic phenomenon that the diesel engine cannot start due to a virtual connection or disconnection in the starting circuit is: the starting motor does not move after pressing the start button. Troubleshooting method: Check the starting circuit carefully and pay special attention to the rust removal and tightening of the lead rod of the battery output connector.
() Small crane starter motor failure
There is a problem with the starter motor. The diesel engine is difficult to start naturally or cannot start. Troubleshooting method: Repair or replace the starter motor. Oil supply system factors: The main reasons why the diesel engine cannot start due to the oil supply system are: oil system factors, oil pump accessories and oil pump regulating valve factors.
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