Views:141 Author:Site Editor Publish Time: 2020-11-09 Origin:Site
1-1. Whether the electromagnetic proportional directional valve has an electrical signal or whether the spool has any action or is stuck.
1-2. The system cannot build pressure.
1-3. The filling valve is stuck, or the filling valve sealing ring leaks.
1-4. Whether the slow valve has an electrical signal or is stuck.
1-5. Back pressure is too high or slows down pressure is too low.
2-1. The pressure oil discharged from the cylinder contains air bubbles.
2-2. The friction force of the slide rail is too large, whether there is lubricating oil.
2-3. The gap between the fitting surface of the guide plate is large, or the top and bottom are uneven.
2-4. The level of the rack and workbench is not adjusted properly.
2-5. The balance valve is blocked.
2-6. Check if the quick-release valve is energized and opened.
2-7. The numerical control system parameter (gain), or the work feed speed setting is too large.
2-8. The backpressure valve is loose and the resistance on both sides is different.
2-9. Whether the solenoid proportional valve coil is biased and whether the neutral position signal of the proportional valve is correct.
2-10. Whether the signal of the proportional servo valve is disturbed, the inspection method is the same as above.
2-11. The piston rod is locked tightly by the oil cylinder sealing ring, and the resistance is large (change the PTFE hard sealing ring test).
2-12. The spherical washer on the grating ruler is not installed, the sliding seat does not move smoothly, and there is a problem with the grating ruler communication line.
2-13. The pressure curve is wrong, the pressure is not enough during work.
2-14. The pressure sealing O-ring of the filling valve produces a small amount of leakage.
3-1. Synchronous detection system failure (grating scale).
3-2. Proportional directional valve.
3-3. Leakage of quick lower valve.
3-4. The large gap in back pressure on both sides.
3-5. The oil temperature is too low.
3-6. Oil string in the upper and lower chambers of the cylinder.
3-7. CNC system parameters.
4-1. Check whether the compensation deflection of the compensation cylinder is large and the zero position cannot be completely restored.
4-2. Check whether the quick-clamp is loose.
4-3. Check whether there is any change in the bottom dead point of each bending.
4-4. Check whether the bow-shaped plate is installed properly and whether the screw hole is dead.
4-5. Changes in the sheet itself (thickness, material, stress).
4-6. Is the grating ruler loose?
4-7. Inaccurate positioning accuracy: Is the zero offset value of the proportional valve appropriate? The positioning cannot reach the bottom dead center, making it impossible to return.
5-1. Check whether the oil pipe installation meets the requirements (extended length, pipe diameter, wall thickness, ferrule, the nut is too tight, too loose, bending radius, etc.).
5-2. Whether the tubing has impact or vibration.
5-3. Check whether the pipeline interferes or collides with other.
5-4. The pipeline is not fixed by pipe clamps.
6-1. The valves sealed with paint shall not be disassembled by themselves, let alone adjusted.
6-2. The valve works normally after cleaning, it must be replaced with new oil and cleaned the oil tank immediately.
6-3. The oil pump shall not be subjected to any knocks or impacts during installation, and the oil pump must be refueled before testing.
6-4. When installing each valve, only its valve body can be transported, and no solenoid valve should be touched.
Zhongrui is China's top 10 press brake manufacturers, providing professional press brake bending machine knowledge and high-quality hydraulic press bending machine. If you have any needs, contact us now!
