Replacing the filter screen should follow a controlled sequence of power isolation, pressure release, old screen removal, mounting-surface cleaning, new screen installation, and final inspection. Operators should follow the equipment manufacturer's maintenance instructions and never perform the replacement while the machine is energized or pressurized.
1. Safety Preparation
Before starting work, disconnect the main power supply, lock the power switch, and attach a "Do Not Energize" warning tag to prevent accidental startup.
Open the appropriate discharge and exhaust valves to release residual powder and pressure from the grinding chamber. Wait until the internal pressure has returned to a safe level before opening the machine.
Wear suitable personal protective equipment, such as a dust mask and protective gloves, and clean accumulated powder around the equipment to reduce dust exposure during maintenance.
2. Remove the Old Filter Screen
Loosen the housing fasteners gradually in a diagonal sequence. Keep bolts, washers, and other hardware organized to prevent loss or incorrect reassembly.
Open the upper housing and locate the ring-shaped filter screen installed inside the grinding chamber. Before removal, check the airflow direction or installation marking so the new screen can be installed in the same orientation.
Use a suitable non-metallic tool, such as a nylon or plastic pry tool, to carefully release the filter screen from its mounting position. Remove the old screen without damaging the surrounding components.
After removal, clean accumulated powder and material deposits from the grinding chamber and mounting surfaces.
3. Install the New Filter Screen
Before installation, verify that the new filter screen matches the required mesh size, material, dimensions, and equipment specifications. Inspect it for deformation, blockage, cracks, or other visible damage.
Position the new screen correctly in the mounting groove or support structure. Follow the original airflow-direction marking and make sure the screen sits evenly against the chamber wall without visible gaps that could cause powder leakage.
Close the upper housing and tighten the fasteners gradually in a diagonal sequence. Apply the tightening method and torque specified by the equipment manufacturer to ensure uniform sealing without deforming the housing.
After reassembly, restore the necessary valves and perform a short no-load test according to the equipment's operating procedure. Check that the filter screen remains secure and that there is no abnormal noise, vibration, or powder leakage.
4. Final Inspection
After the test run, stop the machine and inspect the housing joints and sealing surfaces again. Confirm that there is no powder leakage and that the filter screen remains correctly positioned.
Remove the warning tag only after all maintenance work has been completed, all guards have been restored, and the equipment has been confirmed safe for normal operation.
For customers requiring replacement or customized mechanical components for pulverizing equipment, Hansheng Automation can provide precision machining services based on customer drawings and technical specifications, supporting non-standard filter supports, housings, shafts, mounting components, and other precision parts.
