The daily maintenance of canning machinery (such as punching machines, curling machines, welding machines, painting lines, etc.) is the key to ensuring stable operation of equipment, extending service life, and reducing downtime due to malfunctions. It is necessary to develop targeted maintenance plans based on the characteristics of different equipment types, focusing on the five core links of "cleaning, inspection, lubrication, adjustment, and recording". The specific contents are as follows:

1. General basic maintenance: All canning machinery must perform

Comprehensive cleaning: remove impurities and avoid component jamming

• Equipment surface cleaning: After daily production, wipe the equipment casing, operating table, and protective cover with a dry cloth to remove metal debris, oil stains, and dust from the surface (if the oil stains are thick, special industrial cleaning agents can be used, and direct flushing of electrical components or hydraulic systems with water is prohibited); Focus on cleaning the equipment observation window and instrument display screen to ensure clear readings.

• Internal waste cleaning: After shutting down and cutting off the power, clean the waste in the key areas inside the equipment - the punching machine needs to clean the metal debris in the mold cavity and feeding channel (compressed air can be used to blow it clean to avoid the debris getting stuck in the mold or scratching the material); The curling machine needs to clean the residual metal shavings in the gap between the curling wheels (the accumulation of debris can lead to a decrease in curling accuracy); The conveyor belt needs to be wiped off the surface of the rollers to remove any adhered material residue (to prevent the conveyor belt from deviating).

• Cleaning of surrounding environment: Sort out finished products and waste materials around the equipment, put metal waste into a dedicated recycling bin, and avoid waste accumulation blocking the equipment's heat dissipation port or affecting the operating space; Check for oil and gas leaks on the ground below the equipment, promptly clean and investigate the source.

Basic status check: Confirm that the equipment has no obvious abnormalities

• Safety device inspection: Before starting up daily, confirm that the emergency stop button (red, immediately shuts off the device when pressed) is sensitive and reset normally; The photoelectric protection device of the punch press (the slider stops immediately after being blocked) is unobstructed and the indicator light is normal; The protective fence of the curling machine and welding machine should be free of deformation and firmly fixed, and it is forbidden to have the situation of "the protective fence is missing and the machine is still turned on".

• Power/air/hydraulic system inspection: Check that the power supply circuit is not damaged and the wiring terminals are not loose (especially at the main switch of the equipment, looseness can easily lead to poor contact and equipment tripping); The reading of the gas source pressure gauge is between 0.6-0.8MPa (in accordance with the standard air pressure for canning equipment), and there is no aging or leakage in the air pipe (can be tested by applying soapy water, if bubbling, the air pipe needs to be replaced); The hydraulic system oil level is between the upper and lower limit marks of the oil tank, with no oil leakage (check the oil pipe joints and cylinder seals), and the oil temperature does not exceed 60 ℃ (if the oil temperature is too high, check whether the cooling system is normal).

• Appearance and fastening inspection: Check that the equipment foundation bolts and component connection bolts are not loose (especially high-speed moving parts such as punch press sliders and edge rolling machine pressure wheels, which can cause severe vibration of the equipment if loose); The equipment casing and protective cover should be free of deformation or cracks. If there is any damage, it should be promptly reported for repair to avoid component detachment during operation.

2. Specialized maintenance by equipment type: precise maintenance for core components

（1） Punching/Stretching Machine: Focus on maintaining molds and transmission components

1. Mold maintenance

• Cleaning and inspection: Clean the metal debris and oil stains on the inner wall of the mold cavity daily (can be wiped with a soft bristled brush, do not use hard tools to scrape, to avoid damaging the surface of the mold); Check if the cutting edge of the mold is sharp (if the cutting edge becomes dull, it will cause burrs and stretching cracks on the can body, and it needs to be ground or replaced in a timely manner); Check that the mold positioning pin is not loose or deformed (offset of the positioning pin can cause dimensional deviation of the can body and needs to be recalibrated).

• Lubrication: Apply specialized mold lubricant to the guide column and guide sleeve of the mold daily (do not use ordinary engine oil, as the lubricant has stronger adhesion and can reduce mold wear) to ensure that there is no jamming when the slider moves up and down; If the mold is not used for a long time (such as changing the shape), it is necessary to apply anti rust oil on the surface and wrap it with a moisture-proof film for storage.

2. Maintenance of Transmission and Execution Components

• Sliding block and clutch: Check that the sliding block's running track is free of debris and well lubricated (the track surface needs to maintain a thin oil film and no dry wear marks); Test the sensitivity of the clutch opening and closing (the slider can start quickly after stepping on the pedal, and stop immediately after releasing it, without any "slip" or "delay" phenomenon). If the clutch is stuck, clean the dust inside the clutch and replenish the clutch specific lubricating oil.

• Feeding mechanism: Check the surface of the feeding roller for wear and deformation (wear can cause feeding deviation and inaccurate positioning of the tank body); Clean the impurities in the feeding channel and confirm that the tension of the feeding belt is moderate (too loose can cause slipping, too tight can cause breakage, which can be adjusted by adjusting the tension of the pulley).

（2） Edge rolling machine: Focus on edge rolling wheel and pressure wheel maintenance

1. Maintenance of curling wheel and pressure wheel

• Cleaning and Wear Inspection: Wipe the surface of the edge roller and pressure roller with a soft cloth daily to remove any remaining metal shavings (accumulation of debris can cause uneven edges); Check that there are no serious scratches or dents on the wheel surface (if the wear is excessive, the wheel diameter needs to be measured, and if the deviation exceeds 0.5mm, it needs to be replaced to avoid "wrinkling" and "leaking" of the can body edges); Confirm that the wheel axle is not loose and there is no abnormal noise during rotation (if there is any abnormal noise, it may be due to bearing wear and needs to be disassembled for inspection).

• Pressure adjustment and lubrication: Before daily production, confirm that the pressure of the pressure roller meets the process requirements (1-2 tank bodies can be produced through trial production to check the sealing of the rolled edges. If the rolled edges are too loose, appropriate pressure should be applied, and if they are too tight, pressure should be reduced to prevent damage to the tank body); Add 2-3 drops of specialized bearing lubricating oil to the bearings of the edge roller and pressure roller (not excessive to avoid oil contamination of the tank body).

2. Maintenance of positioning and guiding components

• Check if the positioning block of the can body is secure (offset of the positioning block can cause deviation in the edge position, and it needs to be calibrated with a caliper before tightening); Clean up impurities in the guide track to ensure smooth transportation of the tank body without any jamming.

（3） Welding machine (such as seam welding): Core maintenance electrode and welding system

1. Electrode head maintenance

• Cleaning and repair: Use a dedicated wire brush to clean the oxide on the surface of the electrode head daily (oxides can affect conductivity, leading to virtual or missed solder joints); Check the degree of wear on the electrode head (if there are obvious dents or deformations on the electrode head, special tools should be used to repair or replace it, ensuring that the contact area between the electrode head and the can body meets the requirements, and avoiding welding through or welding points that are too small).

• Cooling inspection: Confirm that the electrode cooling water circuit is unobstructed (the electrode will generate high temperature during welding, and if the water circuit is blocked, the electrode is prone to overheating and damage). Check the water level in the cooling water tank daily, and add purified water if it is insufficient (prohibit using tap water to avoid scale blocking the pipeline). Clean the impurities in the water tank filter screen every week.

2. Welding parameters and circuit inspection

• Check the welding current, voltage, and speed parameters (matching with the material of the tank body produced on the same day, such as welding current of about 80-120A for tinplate and 150-200A for aluminum. Parameter deviations need to be adjusted in a timely manner and cannot be operated based on experience); Check the welding circuit joints for looseness and oxidation (looseness can cause unstable current and affect welding quality).

（4） Painting/Drying Line: Focus on maintaining the nozzle and drying system

1. Maintenance of nozzle and coating system

• Cleaning the nozzle: After daily production, rinse the nozzle with a special solvent (matched with the coating, such as water for water-based coatings and a special diluent for oil-based coatings) to remove residual coating inside (to avoid coating solidification blocking the nozzle and causing uneven coating thickness during the next spraying); Disassemble the nozzle and check if the atomizing plate is worn or blocked. If it is damaged, it needs to be replaced.

• Paint pipeline inspection: Clean the impurities in the paint filter (filter blockage can cause poor paint delivery and affect spray pressure); Check the sealing of the paint tank to avoid moisture or contamination of the paint. Stir the paint before daily production to ensure uniform concentration (uneven concentration can cause color difference in the coating).

2. Drying furnace maintenance

• Cleaning and temperature inspection: Clean the coating residue in the drying oven daily (residue accumulation can affect the temperature uniformity inside the oven, which can be gently scraped off with a special scraper to avoid damaging the furnace wall); Check whether the temperature sensor reading is accurate (a thermometer can be placed for comparison, if the deviation exceeds ± 5 ℃, the sensor needs to be calibrated), and ensure that the drying temperature meets the process requirements (such as the drying temperature of the outer coating of the tinplate is about 180-220 ℃, which is prone to coking if the temperature is too high, and insufficient adhesion if the temperature is too low).

• Ventilation inspection: Clean the impurities in the exhaust filter of the drying furnace (blockage of the filter can cause poor exhaust gas discharge and affect drying efficiency), and confirm that the exhaust fan is running normally without any abnormal noise.

3. Lubrication management: executed according to "fixed point, fixed quality, and fixed quantity"

• Fixed point lubrication: Clearly identify the parts that need to be lubricated for each equipment (such as punch guide rails, rolling wheel bearings, welding machine chains), and post "lubrication point markings" on the equipment to avoid missing or adding incorrect parts.

• Fixed quality lubrication: Use lubricating oil/grease that matches the equipment (such as 32 # guide rail oil for punch press guide rails and lithium based grease for rolling wheel bearings. It is forbidden to mix different types of oil to avoid chemical reactions that may cause lubrication failure). The lubricating oil should be sealed and stored within its shelf life after opening to prevent impurities from entering.

• Quantitative lubrication: Control the lubrication amount according to the equipment manual requirements (such as adding 2-3 drops of lubricating oil to the bearing, applying an oil film thickness of about 0.1-0.2mm on the guide rail, not excessive, excessive will adsorb dust and form oil sludge, which will aggravate wear), and record the lubrication part, oil type, and dosage daily.

4. Maintain records and handle exceptions

• Establish daily maintenance records: Fill out the "Can Making Equipment Maintenance Record Form" daily, detailing maintenance time, equipment shape, maintenance content (such as "punch mold lubrication, edge roller cleaning"), any abnormalities found (such as "slight wear of welding machine electrode head"), and processing results, in order to trace the equipment status and provide a basis for subsequent regular maintenance.

• Exception handling process: If minor abnormalities are found during maintenance (such as small-scale oil leakage or slight abnormal noise from components), they can be handled by themselves (such as replacing sealing rings or tightening bolts); If there is a serious malfunction (such as mold cracking, motor smoking, or severe oil leakage in the hydraulic system), the machine should be stopped immediately, and a "fault to be repaired" warning sign should be hung. Forced start-up is prohibited, and equipment maintenance personnel should be notified in a timely manner. The fault phenomenon should be explained in detail, and professional components (such as electrical cabinets and hydraulic valve groups) should not be disassembled without authorization.