460, Excavator slewing system failure analysis and motor repair 4600 excavator slewing system if there is one-way slewing and unable to brake, most of the damage in the two-way relief valve; if there is no rotation with abnormal sound At that time, the hydraulic motor is improperly assembled or the reducer is damaged. For example, if the left and right direction rotations do not work and there is no abnormal noise, the gear at the lower end of the reducer falls off; if the two-way rotation is weak and the operation is slow, the right working pump is Tubing suction or two-way relief valve pressure is too low. At this time, the right working pump inlet pipe or the force of adjusting the two-way relief valve should be checked. If it still fails to return to normal, the hydraulic motor is faulty and should be dismantled for maintenance. The specific method is as follows. Disassemble the hydraulic motor as attached, in the dismantling of the body should be marked on the upper cover 3 and 6 on the lower cover 6 assembly mark, in order to avoid assembly errors, inspection, the main inspection, bronze plate 4 plunger cylinder 8 plunger swash plate 12 And all seals, such as grinding Liu Zhiqiang 1. Tubing fittings 2. Bearing cover 3. Upper cover 4. Bronze plate 5. Oil seal 6. Shell off 7. Shaft 8. Cylinder body 9. Guide sleeve 10. Plunger spring . Plunger 12. Swash plate 13. Under cover 14. Bearing damage or damage should be repaired or replaced. Repair of main wearing parts Bronze plate repair When the top surface of the bronze plate is worn, the top surface of the bronze plate should be polished. The surface of the plate can also be finished. The turning depth can be eliminated just by using the wear marks. The plunger cylinder and plunger of the upper cover 3 are repaired because the working pressure and the rotation speed of the hydraulic motor are both low, and two metal sealing rings are provided on the plunger. Therefore, when the slight strain is applied, it can be polished with oilstone and emery cloth. . The repair of bearings and seals is easy to buy due to the low cost of the bearings, so they should be replaced after damage. In order to ensure the reliability of the 1 seal, one cow should be replaced after it has been damaged. The impact of the cutterhead water jet system The cutter generates thermal energy for children in the rock breaking process. Spray cooling is an effective way to reduce the tool temperature. The cooling effect is related to the arrangement of the nozzle on the cutter head and the water jet system's force of rejection and the expensive water spray. The poor cooling effect will increase the temperature of the tool, which will affect the floating seal of the bearing. That is, if the temperature is too high, the seal will fail and the tool will leak. Practice has proved that due to the outer high tool position tool is not equipped with nozzles, resulting in high tool position tool leakage probability is much greater than the low tool position tool. The influence of the tool mounting hole has a certain protective effect on the normal use of the tool. Excessive wear of the tool hole flange will cause serious damage to the tool, especially the high tool edge tool located in the arc-shaped transition area of ​​the cutter disk. And transitional knife. Due to the excessive wear of the knife hole flange, the knife cover protrudes too much, and the blocky rock slag will quickly wear the knife body cover; the large heat generated during the wear process also affects the tool bearing and the floating seal, ie Excessive temperatures will cause the seal to fail, causing the tool to leak. The effect of the tool position is that the high tool position tool is located in the circular arc-shaped transition area of ​​the tool disk. Because the positive force acts on the tool, the tool will generate an axial force, which will cause the tool to have an axial displacement or cause bearing damage. It is also the main reason for the high knife tool cutter oil leakage. The influence of rock The rock conditions that affect the leakage of cutting tools mainly refer to the development of soft rock and joints with well-developed crushing rocks. Joint development of soft rock For joint development and development of soft rock, the choice of driving parameters is mainly small thrust and high torque. At this point, the lateral force applied by the cutter increases, which may cause axial displacement of the cutter body relative to the bearing and damage the initial sealing state of the floating seal, thereby causing the seal to fail, resulting in leakage of the cutter. Joints with well-developed crushing rock For rock masses with well-developed joints, a large number of massive rock grains larger than 15 and 1 collapse during the excavation process, and they crush and roll between the cutter head and the rock face. As a result, the lateral forces that the tool bears are increased, which causes the seal to fail; on the other hand, the cutter body is squeezed and deformed, so that the floating seal of the support ring is broken, resulting in failure of the seal and causing the tool to leak oil. 3. Technical Measures for Preventing Tool Leakage Oil Leakage of tools is often not the result of unilateral factors; it is the result of a combination of various factors; how to avoid the occurrence of oil leakage from the tool, combined with the above analysis, proposes the following prevention The technical measures for the oil leakage of the tool, the correct selection of qualified parts and components, and the development of reasonable wear limits for components. Formulate the correct tooling process and do a bench test before use. Follow the correct tool change rules to ensure that the tool change process is correct and reasonable. Make sure the condition of the cutterhead and the water spray system are good. Reasonably choose the driving parameters.
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