Fault phenomenon, cause analysis and improvement method of LYB vertical submerged pump
Fault phenomenon, cause analysis and improvement method of LYB vertical submerged pump 1. Fault phenomenon and cause analysis of LYB vertical submerged pump 1. Check the internal leakage of the boom cylinder. The easiest way is to raise the boom to see if it has a clear free fall. If the drop is obvious, remove the cylinder and check that the seal should be replaced if it is worn. LYB vertical submerged pump failure phenomenon, cause analysis and improvement method 1. Fault phenomenon and cause analysis of LYB vertical submerged pump 1. Check movement The internal leakage of the arm cylinder. The easiest way is to raise the boom to see if it has a clear free fall. If the drop is obvious, remove the cylinder and check that the seal should be replaced if it is worn;
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2. Check the control valve. First clean the safety valve and check if the spool is worn. If it is worn, it should be replaced. If there is no change after the installation of the Botaibang safety valve, check the wear of the valve stem of the control valve. The clearance limit is generally 0.06mm. If the wear is serious, it should be replaced.
3. Measure the pressure of the submerged pump. If the pressure is low, the adjustment is made, and the pressure is still not adjusted, indicating that the submerged pump is seriously worn.
In general, the main reasons for the failure of the LYB vertical submerged pump boom to be lifted are:
a. The submerged pump is severely worn. The pump leakage is severe at low speed operation; the pump pressure is slightly increased at high speed operation, but the volumetric efficiency is significantly reduced due to wear and internal leakage of the pump, and it is difficult to reach the rated pressure. Long-term work intensifies the wear and tear, and the oil temperature rises, which causes the wear of the hydraulic components and the aging and damage of the seals, the loss of the sealing ability, the deterioration of the hydraulic oil, and finally the failure;
b. The selection of hydraulic components is unreasonable. The boom cylinder is 70/40 non-standard series, and the seals are also non-standard parts. The manufacturing cost is high and the seal replacement is inconvenient. The cylinder diameter of the boom cylinder is small, which will inevitably make the system set high pressure;
c. LYB vertical submerged pump system design is unreasonable. The control valve and the full hydraulic steering gear are connected in series with a single pump, the safety valve is set to a pressure of 16 MPa, and the rated working pressure of the submerged pump is also 16 MPa. It often works under full load or long-time overload (high pressure), and the system has hydraulic shock. It does not change oil for a long time, and the hydraulic oil is polluted, which aggravates the wear of the submerged pump, causing the pump casing to burst. ).
Second, LYB vertical submerged pump improvement and effect 1. Improve hydraulic system design. After many demonstrations, the advanced priority valve and load sensing full hydraulic steering gear are adopted. The new system can preferentially distribute the flow according to the steering requirements. The oil supply is sufficient regardless of the load size and the steering wheel speed. It can be fully supplied to the working device circuit, thereby eliminating power loss due to excessive oil supply to the steering circuit, improving system efficiency and reducing the working pressure of the submerged pump;
2. Optimize the design of the boom cylinder and the submerged pump to reduce the system working pressure. Through optimization calculations, the boom cylinders use the standard series 80/4. The displacement of LYB vertical submerged pump is increased from 10ml/r to 14ml/r, and the system setting pressure is 14MPa, which meets the lifting force and speed requirements of the boom cylinder;
3. During the use, attention should also be paid to the correct use and maintenance of the loader LYB vertical submerged pump, adding or replacing hydraulic oil regularly, maintaining the cleanliness of the hydraulic oil, and strengthening daily inspection and maintenance.
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