How to ensure safety during the use of Three roll mill?

1. Safety preparation before operation
1. Personnel qualifications and training
Operators must undergo professional training and be familiar with the equipment structure (such as the direction of roller rotation, adjustment mechanism, emergency stop button position) and operating procedures. It is strictly forbidden to operate without a license or non-designated personnel.
Clear safety instructions: such as prohibiting the wearing of gloves (to prevent rolling into the roller), prohibiting long hair exposure (must wear a work hat), and prohibiting loose clothing (cuffs need to be tightened).
2. Equipment and environment inspection
Safety device confirmation: Check whether the emergency stop button is sensitive (the power should be cut off immediately after pressing), whether the protective cover is intact (covering the roller transmission part to prevent physical contact), and whether the scraper is firmly fixed (to avoid falling off and rolling in).
Roller and gap inspection: Confirm that there are no foreign objects (such as tools, debris) on the roller surface, manually turn the roller (stop state), and ensure that there is no jamming; when adjusting the gap, calibrate with a feeler gauge first to avoid roller collision due to too small a gap.
Environmental cleaning: No debris is piled up around the equipment, no oil on the ground (to prevent slipping), and good ventilation (if the material contains volatile components, an exhaust device must be equipped).
2. Safety protection during operation
1. Strictly abide by the operating specifications
Start-up sequence: first open the cooling system (to ensure normal circulation of cooling water) → start the motor (idle for 1-2 minutes to confirm that there is no abnormal noise) → then add the pre-treated material (avoid dry grinding or hard particles entering).
Feeding control: Use special wooden or plastic tools to assist in feeding, and it is strictly forbidden to directly touch the material or roller with your hands; the amount of feeding must be uniform to avoid excessive accumulation causing roller overload or material splashing.
Dangerous behavior is prohibited: Do not open the protective cover during operation, and do not use metal tools (such as shovels, wrenches) to clean the roller surface (to prevent tools from being involved in damaging the roller or injuring people); if the gap needs to be adjusted, the machine must be stopped for operation.
2. Real-time monitoring and emergency treatment
Closely observe the equipment status: If abnormal noise is found (possibly due to bearing wear or gear jamming), excessive roller vibration, or motor overheating (shell temperature exceeds 60°C), the emergency stop button should be pressed immediately, and the power supply should be cut off to investigate the cause.
Abnormal material handling: If the material sticks to the roller and causes the speed to drop, or smoke or odor appears (possibly due to friction overheating causing material combustion), stop the machine immediately, clean it after the roller stops completely, and forcefully peel it off during operation.
III. Safety handling after shutdown
1. Standardize the shutdown process
Stop feeding first, wait for all the materials on the roller to be discharged and the scraper to scrape it clean, then turn off the motor → wait for the roller to stop completely (about 1-2 minutes), then turn off the cooling system → discharge the residual cooling water in the roller (especially in low temperature environments, to prevent freezing and cracking).
2. Equipment cleaning and arrangement
Wipe the roller surface with a special cleaning agent (such as alcohol, kerosene) to remove residual materials (to avoid drying and affecting the next use). Use a soft cloth for cleaning. Do not use hard objects such as steel wool to scratch the roller surface.
Clean up the work area, store tools and materials in designated locations, and keep the passage unobstructed.
IV. Safety requirements for equipment maintenance
1. Regular inspection and protection
Check the transmission system every week: whether the gearbox lubricating oil is sufficient (replenish in time when the oil level is below the scale line), whether the bearing is loose (use a wrench to test lightly without shaking), and ensure that the transmission parts rotate smoothly.
Check the safety device every month: whether the emergency stop button can instantly cut off the power, whether the fixing screws of the protective cover are loose, and whether the roller gap adjustment mechanism is stuck (if it is electrically adjusted, check whether the line is damaged).
2. Safety protection during maintenance
Before maintenance, the main power must be cut off, and a warning sign "Maintenance in progress, no closing" must be hung at the power switch to prevent accidental start-up.
When disassembling rollers or transmission parts, they need to be fixed with special brackets (to prevent parts from falling); after replacing blades, bearings and other parts, test run to confirm that there are no abnormalities (idle for 3-5 minutes to check for abnormal sounds or jams).
V. Safety precautions for special scenarios
1. Inflammable and explosive materials: If grinding materials containing solvents such as paint and ink, ensure that the work area is away from fire sources, the equipment is grounded (to prevent static sparks), and equipped with a fire extinguisher.
2. High-temperature or corrosive materials: Wear heat-insulating gloves when contacting high-temperature materials; after handling corrosive materials, thoroughly clean the roller (to avoid corrosion of the material), and choose corrosion-resistant rollers (such as stainless steel).