Publish Time: 2026-07-11 Origin: Site
The fully automatic horizontal molding machine relies on compressed air to drive actions such as compaction, lifting the mold, and closing the box. Air leakage is a common fault in foundry workshops. It not only consumes compressed air and increases electricity costs but also leads to insufficient equipment power and poor sand mold formation, hindering normal production. Based on the actual conditions on site, six key reasons for air leakage in the molding machine have been identified.
Damage to the air pipe system and assembly oversights. The equipment’s constant vibration and movement can cause the air pipe to crack over time. In winter, low temperatures can cause the plastic air pipe to harden and become brittle, making the bends extremely prone to breaking and allowing air to leak out. Additionally, if the air pipe clamps and couplings are not securely fastened during installation, and the joints are not properly sealed, air will continue to leak after the equipment is powered up and pressurized.
The quality of pneumatic components does not meet the required standards. If low-cost, substandard solenoid valves and air valves are purchased, the internal valve seat clearance is excessively large, resulting in continuous pressure loss and air leakage during operation, which prevents the maintenance of stable pressure.
There is insufficient precision in the machining of the cylinders. The original factory’s cylinder barrel processing is inadequate, or the workshop’s machinist’s grinding process is rough, resulting in scratches on the inner surface. Even if a brand-new seal ring is replaced, it will be difficult to achieve effective sealing, leading to gas leakage through the piston rod.
There are abnormal conditions in the gas supply system. When the output pressure of the air compressor is too low, airflow can easily recirculate within the pipes, damaging the sealing structure of the valves. Compressed air containing large amounts of accumulated water is not promptly separated, causing the water vapor to corrode the valve body and also clogging the silencer, leading to internal pressure buildup, causing hidden leaks that are difficult to detect during inspections.
Leakage faults are often the result of a combination of issues related to assembly, components, and air sources. The workshop needs to standardize the installation of piping systems, select qualified pneumatic components, regularly drain water from the storage tanks, conduct daily inspections of air leakage points, and promptly address any faults to ensure the stable operation of the molding machine.