Core Definition

The Fully sealed filter is a highly efficient, fully automated device specifically designed for solid-liquid separation. Its core feature lies in its completely sealed design, which employs specialized sealing structures and materials to ensure a tight connection between the drum and the equipment. It is widely used in industries with stringent hygiene, safety, and environmental requirements, such as chemical, pharmaceutical, and food processing.

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Working Principle

 

This equipment operates on the core principle of vacuum negative pressure. By creating a pressure differential between the interior and exterior of the rotating drum, it enables rapid filtration and drying of the material within a vacuum environment. This approach enhances filtration efficiency and product quality while reducing equipment failures and ensuring operational stability.

Functional Features

 

The fully sealed drum filter offers exceptional versatility, capable of being adjusted and optimized according to varying material properties and process requirements. It accommodates multiple filtration processes including pre-washing, rinsing, and drying. Additionally, it can be equipped with an automated control system as needed, enabling intelligent and automated operation. This further reduces manual intervention while enhancing production stability and controllability.

What precautions should be taken when operating a fully sealed filter machine? What preparatory steps are required before starting it up?

Pre-startup Preparation:

1. Check the oil level and cooling water in the equipment, and rotate the shaft. Exercise extreme caution during inspection.  

2. Verify the status of all valves before startup. Adjust valves to the correct positions based on the specific equipment being started.  

Precautions for Startup：

1. Upon startup, inspect the main drive and lifting mechanism of the sludge scraper at the top of the thickener to ensure proper operation.  

2. Start the sludge pump to feed material into the drum. Before pumping sludge, flush the inlet and outlet pipelines. After flushing, partially open the bottom flushing valve of the thickener to prevent salt sludge settled at the tank bottom from clogging the pipeline. Finally, activate the sludge pump.  

3. Slightly open the vacuum pump inlet valve. Once water flows from the outlet, start the vacuum pump.  

4. Once material enters the drum feed trough, activate the drum agitator. Do not start the main drive under any circumstances.  

5. After starting the oil pump, allow it to run for one minute before shutting it down.  

6. When the feed trough level approaches the overflow outlet, open the primary vacuum valve. After confirming vacuum suction has started, activate the drum's main drive. When the filter cake rotates to a 45-degree angle with the upper feed trough opening, open the secondary vacuum valve. When the cake rotates to a 45-degree angle between the drum discharge surface and the feed trough opening, open the air-blowing valve to assist discharge.  

7. Start the filtrate pump to extract filtrate from the steam-water separator.  

8. Monitor vacuum level, filter cake moisture content, cake thickness, feed trough liquid level, and discharge status during operation. Take appropriate actions based on varying conditions.  

9. Pay close attention to slurry concentration and wash tank liquid level during feeding.  

10. Control the liquid level in the steam-water separator throughout the filtration process.  

Precautions for Fully Sealed Filtration Machines：

1. If material remains in the drum feed trough after vacuum cessation, operating the main drive is strictly prohibited, as this may cause severe damage to the filter cloth.

2. Immediately notify personnel to replace the filter cloth upon detecting any damage.  

3. Maintain proper liquid level in the material trough—avoid excessively low levels that reduce vacuum pressure or excessively high levels that cause overflow.  

4. Monitor the liquid level in the filtrate tank to prevent the filtrate pump from running dry or becoming clogged, which could lead to tank overflow.  

5. Thoroughly clean all pipelines after shutdown.  

6. Maintain appropriate filter cake thickness. Too thin cakes prevent automatic discharge, while excessively thick cakes may detach from the filter cloth, reducing vacuum pressure.  

7. The filter liquid tank level gauge may be unstable. Operators should frequently check liquid levels in each tank to prevent overflow caused by gauge malfunction.  

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