Maintenance and Care Methods for Barrels and Screws
Maintenance and Care Methods for Barrels and Screws
Implementing effective preventive maintenance for the barrel and screw assembly is the most direct means of addressing issues such as wear and gear tooth failure, thereby minimizing downtime costs. To address your specific systematic maintenance requirements, I have broken down the maintenance process into four core dimensions-Daily Inspections, Standardized Cleaning, Wear Repair, and Preventive Mechanisms-to assist you in establishing a sustainable, long-term maintenance system.
Daily Inspections: Establishing "Listen, Look, Measure" Standards
The core objective of daily inspections is to detect abnormal signals in a timely manner, preventing minor issues from escalating into major repairs.
Listen for Sounds: During operation, if abnormal noises are heard coming from the gearbox or within the barrel, this may indicate damaged bearings, inadequate lubrication, or the presence of foreign objects mixed in with the material. If the material discharge from the die head is unstable and accompanied by vibration, inspect the screw to determine if it is bent or if the clearance fit is excessive.
Look at Parameters: Closely monitor current, voltage, and die head pressure readings. Significant pressure fluctuations may indicate a clogged filter screen or uneven material plasticization. If the oil temperature exceeds 50°C, immediately activate the cooling water system to maintain the temperature within the 20°C to 50°C range.
Measure Clearance and Seals: Periodically inspect the wear condition of the sealing ring at the tail end of the screw. At least once a year, inspect the gearbox bearings and oil seals to prevent oil leakage, which could lead to lubrication failure.
Standardized Cleaning: Avoid Harsh Methods; Remove Carbon Deposits Scientifically
Cleaning is a high-frequency maintenance task; however, using incorrect methods (such as direct heating with an acetylene torch) can directly compromise the metal properties of the screw, leading to tolerance failures.
Strictly Prohibit Acetylene Torches: Acetylene flames can reach temperatures as high as 3000°C, causing localized overheating and deformation of the screw, as well as alterations to its metal structure. Their use is strictly forbidden.
Recommended Cleaning Procedure:
Purging and Cooling: Stop feeding material into the machine and reduce the screw speed to 15–25 rpm. Purge any residual material from the system, and set the barrel temperature to approximately 200°C.
Selecting Cleaning Agents: To address carbonized residues, select a physical-method cleaning agent with a high glass fiber content or a specialized chemical cleaning resin, utilizing their abrasive or stripping properties to effectively remove the accumulated grime. Tool Selection: After disassembly, use a copper brush and a copper scraper to remove residual material; the use of steel tools is strictly prohibited to prevent scratching the alloy layer on the screw surface.
Shutdown Protection: Prior to a prolonged shutdown, fill the barrel with a thermal-stable cleaning agent or apply rust-preventive oil to prevent oxygen-induced carbonization of residual materials.
