News Updates
Common Faults and Solutions for Hydraulic Stations in Plate Shears
Release date:
2020-06-07 18:00
Source:
1. The oil circuit fails to build pressure, and the upper tool holder remains stationary. The electrical connector of the solenoid directional control valve has poor contact—inspect the connector. Alternatively, the spool of the solenoid valve may be stuck due to debris or damaged by abrasive wear, preventing it from moving. Additionally, contaminants might have lodged in the sealing areas of the individual spools within the combination valve, disrupting their ability to seal properly. Lastly, the throttle ports inside the combination valve could be clogged—check, disassemble, and clean as necessary.
2. If the upper tool holder returns slowly or fails to reach top dead center, or if the sequence of movements between the upper tool holder and the material-pressing cylinder is out of sync, check and adjust the nitrogen pressure in the return cylinder to ensure it meets the specified rating.
3. Adjusting the Blade Clearance:
When adjusting the clearance, first loosen the locking screw, then turn the handle to the desired scale setting, and finally tighten the screw securely. The ball valve is used specifically to measure the uniformity of the clearance between the upper and lower blade edges. Here’s how: Perform a single stroke—when the upper and lower tool holders reach bottom dead center, quickly turn the ball valve to shut off the oil supply, stopping the upper tool holder precisely at the bottom dead center. Afterward, gently open and close the ball valve again, allowing the upper tool holder to rise incrementally across its full stroke. At this point, you can measure the uniformity of the blade clearance segment by segment.
4. When the return cylinder pressure is low, causing the upper blade to rise slowly, inflate the return cylinder by removing the protective cap and air valve cap. Then, attach the inflation tool, connecting its other end to a nitrogen cylinder (never use oxygen). Finally, carefully open the inflation tool and gradually turn on the nitrogen cylinder’s shut-off valve, keeping an eye on the inflation pressure gauge.
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