What are the precautions when changing (or looping) the mesh in a new backflush hydraulic screen changer?

When changing the mesh (i.e., looping) in a new backflush hydraulic screen changer, the following precautions need to be taken to ensure the safety and effectiveness of the operation:

I. Preparations Before Operation

Check Equipment Status: Ensure that the backflush hydraulic screen changer is in good working condition, with no damage or abnormalities to any parts.

Select Appropriate Mesh: The installed mesh must be of the right size, neither too large nor too small, to ensure effective filtration and normal operation of the equipment.

Clean the Work Area: Keep the work area tidy to avoid interference from debris during the mesh changing process.

II. Precautions During Mesh Changing

Stop the Machine for Mesh Changing: Whenever possible, perform mesh changing when the machine is stopped to minimize production disruptions and prevent damage to the equipment. If mesh changing must be done while the machine is running, reduce production speed and mark the tubing so that any thinned areas can be addressed after the mesh change.

One-Step Action: During mesh changing, ensure that the action is completed in one step without pausing. This helps reduce pressure fluctuations and maintains production continuity.

Avoid Damaging Parts: When removing clogged mesh, do not use the reciprocating plate as a fulcrum to pry open the filter screen. Additionally, avoid hitting the reciprocating plate or filter block with hard objects to prevent damage to equipment parts.

Pay Attention to Reciprocating Plate Movement: If the reciprocating plate of the screen changer cannot be pulled back or out, do not change its direction of movement as it may scratch the plate.

Maintain Lubrication: Never repeatedly push and pull the reciprocating plate without lubrication to avoid scratching the contact surface. Ensure good lubrication of all equipment parts.

III. Post-Operation Inspection and Maintenance

Clean the Screen Changer: After mesh changing, quickly clean the removed screen changer, remove the installed mesh, and clean the groove where the mesh was installed.

Check Equipment Function: If the equipment has been idle for more than 10 days, warm it up for about 1.5 hours before checking if the mesh changing action is sensitive and reliable.

Monitor Pressure Changes: If the hydraulic station fails to reach the set value within two minutes, shut it down immediately and investigate the cause. Additionally, regularly monitor changes in melt pressure and replace the mesh promptly if the melt pressure increases by 20% compared to when the machine was started.

IV. Safety Precautions

Operator Training: The backflush hydraulic screen changer should be operated by skilled personnel who receive regular training and assessments.

Follow Operating Procedures: Operators should strictly adhere to operating procedures and safety regulations to ensure the safety and effectiveness of the operation.

Emergency Shutdown: In emergencies, immediately press the emergency stop button and cut off the power to ensure the safety of the equipment and personnel.

In summary, when changing the mesh in a new backflush hydraulic screen changer, multiple aspects need to be considered, including preparations before operation, precautions during mesh changing, post-operation inspection and maintenance, and safety precautions. These measures help ensure the safety and effectiveness of the mesh changing operation, improving the stability and lifespan of the equipment.

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