How to Maintain and Clean a Peanut Oil Extraction Machine?

Peanut oil extraction machines, as the core equipment of petroleum processing, directly influences the output, quality and service life of oil. Scientific maintenance and cleaning can not only reduce failure rate, but also prolong the service life of the equipment. In this paper, the main points of maintenance of peanut oil extraction machine are systematically expounded from four aspects: routine cleaning, key parts maintenance, seasonal maintenance and fault prevention.

1.Wash immediately after operation.
Oil and cake crumbs must be removed from the press chamber, screws and filters immediately after each crushing operation. Long-term accumulation of these residues can lead to oxidation and scaling, reduce oil yield and potentially expose oil to mold contamination. Food-grade soft bristles and neutral cleaning agent are recommended for thorough cleaning, with special attention to defects such as screw shaft. For newly formed oil stains, rinse with 80°C hot water to dissolve the oil and rinse out the residue.
2.Deep cleaning ballast
The ballast is the core component of the ballast and its cleaning shall follow the following steps:
Pre-treatment: Wear heat-resistant gloves and use sticks to remove visible debris from the ballast.
Remove and clean: Unscrew the locking ring counterclockwise, remove the press chamber smoothly, place it under the tap and brush inside and out.
Special treatment: For raw materials with high phospholipid content such as rapeseed and peanuts, it is recommended to rinse the pipes weekly with edible lye to dissolve accumulated gelatinous substances.
Dry and rust proof: After cleaning, wipe the components with a rag to prevent metal parts from rust.
3.Maintenance the Oil Filtration System
Due to long-term exposure to crude oil, oil filtration system are prone to oil scale and require focused cleaning:
Vacuum Oil Filters: Remove oil tank regularly, clean inner wall with water detergent solution and replace filter cloth.
Filter cleaning: using a high-pressure air gun to blow out clogs in the pores of the filter to ensure filtration efficiency.

1. Transmission System lubrication
Lubrication of transmission components is essential to reduce wear and prolong service life:
Gear box and Bearings: high Replenish high-temperature lithium-based grease is replenished every 3 months and specified after 200 hours of continuous operation.
Chain drive Models: Clean chain gaps of oil residue with brush once a week and spray with special anti-rust lubricant.
Oil level monitoring: For models with drip oil cups, use ISO VG68 grade machine oil and check the oil level meter before each shift.
2. Ballast Maintenance
Ballast cleanliness directly affects oil quality:
Mirror Polishing: 800-grit or finer sandpaper are used each month to polish the inner wall of the pressure chamber along the particle surface to reduce frictional resistance by over 15%.
Threaded gap cleaning: weekly cleaning of thread gaps with food-grade nylon brush and 80°C thermoalkali solution to prevent oil residue accumulation.
3. Hydraulic System Maintenance
Hydraulic systems require special attention to oil circuits:
Oil sample test: Quarterly oil sampling viscosity testing to prevent gel deposition at high temperature.
Adsorption of Metal Debris Adsorption: Filter hydraulic oil using magnetic filters to reduce component wear.
Low-temperature Adaptation: In winter, replace with low-temperature hydraulic fluid and preheat for 10 minutes on empty before starting again.

1. Rust prevention during Humid Seasons
The rainy season requires additional moisture protection measures:
Control box protection: daily activation of the dampproof heating module to prevent short circuit.
Breather Valve Drying: Place silicone drier on the gearbox's breather valve to absorb moisture.
Metal Surface Coating: Food grade rust oil is applied to all metal surfaces during prolonged closure.
2. Winter warm-ups and freezes
Special attention should be paid to:
Hydraulic System Preheating: Preheat the hydraulic system to more than 20°C before running to prevent seal brittleness.
Motor protection: Install a Install dust screens in the air inlets the motor cooling fan and wash it quarterly to ensure cooling efficiency.
3. Long-term Shutdown Procedures
Full protection is required when the equipment is not operational for a long period of time:
Chamber Coating: food grade rust oil is applied to the inner wall of the pressurized chamber to prevent oxidation.
Equipment Sealing: Install dust cover on equipment to prevent dust from entering.
Replacement lubricant: check the quality of gearbox oil, if the gearbox oil spoilage, should replace all.

1. Dealing with Abnormal Situations
The following should be stopped immediately:
Reduce pressure: Check screws, bars and cake outlet ring for wear and replace as needed.
Abnormal cake/ grease secretion: Adjust cake thickness to 1.5-2.5 mm and check moisture content of pressurised embryo.
Temperature anomaly: If spindle shaft bearing temperature exceeds 65°C, stop machine and check the lubrication status.
2. Electrical system maintenance
Cleaning and testing of electrical components is essential:
Contact: clean the contactor in the control cabinet once a month with anhydrous alcohol to prevent oxidation and poor contact.
Parameter Backup: If the device is equipped with PLC control system, regularly backup program parameters to prevent data loss due to power failures.
3. Maintenance records management
Keeping a complete record helps analyze fault patterns:
Record content: includes maintenance time, replacement parts, anomalies and corrective actions.
Data analysis: Use records to identify components with high failure rates and develop preventive maintenance plans.
Compliance Checks: In some areas, food safety certification may require maintenance of records.

1.Customized Cleaning Solutions
Different oil crops require different cleaning strategies:
High-oil Crops: such as sesame seeds, immediately after pressing with rice bran powder adsorption residual oil.
Fuzzy Crops: Cotton seeds, for example, require extra screening for screen blockages.
Hard-shell Crops: For example, walnuts, the hard shell residues crushed in the crushing chamber needs to be cleaned regularly.
2. Precision Components protection
Particular attention should be paid to load cells, temperature probes and other precision components:
Oil film removal: Clean sensor surface regularly with electronic cleaning agent to prevent data drift.
Dust Cover Installation: Install dust cover on sensor to reduce oil scale adhesion.
3.Lubricant Selection
Select appropriate lubricant according to the type of equipment:
High-speed Components: Lithium-base lubricating grease with good abrasion resistance is required if screw bearings are used.
Low temperature environment: use synthetic lubricant with good low temperature fluidity.
Food-grade Requirements: H1-grade food grade lubricants are used for components in contact with oil.
Conclusion:
The maintenance and cleaning of peanut oil extraction machine is a systematic engineering, which requires attention to daily operation specifications, maintenance of key components, seasonal protection and data management. Scientific maintenance can not only improve the production and quality of oil, but also greatly prolong the service life of equipment and reduce long-term operating costs. It is recommended that operators develop personalized maintenance plans based on equipment manuals and this guide and receive regular professional training to meet changing processing demands.