As core equipment of packaging packaging printing labeling industry, the operation stability of Paper sticker slitting machines directly influences product quality and efficiency. In accordance with industry practice and equipment maintenance standards, the routine maintenance of the cutter should focus on three key modules: mechanical structure, electrical system and tool management. The combination of preventive maintenance and condition monitoring technology can greatly reduce the failure rate and prolong the service life of the equipment. Below is a detailed discussion of six key aspects.
Refined Lubrication Management of Mechanical Structures
1.1 Periodic Lubrication of Transmission Components
Gear, chain and timing belts are the key parts of the transmission system of the shearing machine, the their lubrication status directly influences transmission accuracy and equipment lifespan. A graded lubrication strategy are recommended:
Daily Lubrication: Manually inject oil in the lubricating hole of screw rods and sliding guide columns, which are high frequency moving parts. Use 32# or 46# wear-resistant hydraulic fluid to ensure the thickness of the oil film is between 0.02-0.05mm. For example, the central surface the center-surface slitting machine rod in Suzhou is mechanically produced and requires daily lubrication while removing metal debris to prevent accelerated wear and tear.
Weekly maintenance: Use chain-specific lubricants on the drive chain (e.g. Molykote DX). After spraying, run the device for 10 minutes to allow the lubricant to penetrate, then wipe off any excess oil with a dry cloth. Check the tension of timing belts and use the tension meter to ensure the deviation is within ±5%.
Monthly maintenance: check the oil level of reduction gears, bearing and other sealed transmission components, and replenish the oil oil level gauge to 2/ 3 mark. For open gear transmissions, remove old oil stains and apply molybdenum disulfide lithium-based grease not more than one third of the width of the tooth surface.
1.2 Rust resistance on Key Friction Surfaces
When the equipment inactivity working, metal components are prone to rust due to high ambient humidity. A three-tiered system of protection should be established:
Short-term Shutdown (1-7 days): Spray all bright metal surfaces with anti-rust oil (e.g., WD-40), focusing on precision components such as knife holders and air shafts.
Intermediate Shutdown (1-3 months): Cover the equipment with moisture-wicking paper, cover the entire equipment with plastic sheeting and seal the joints with duct tape.
Long-term Shutdown (more than 3 months): Disassemble removable components (such as longitudinal cutting knife sets) and soak them in arust proof oil tank. For major equipment, VCI is used for spatial protection.
Specification for Safe Maintenance of Power System
2.1 Regular dust removal and Insulation Testing
Electric cabinets require deep cleaning every month:
Compressed air (pressure ≤ 0.2 MPa) is used to blow dust off PLC modules and inverter heat sinks, and soft brushes are used to remove accumulated dust.
a megohmmeter insulation resistance of a 3 -phase winding shall be 0.5 Omega. For servo drive systems, check the integrity of the encoder cable shielding separately.
Emphasis is placed on identifying loose terminal connections and tightening them with a torque wrench in accordance with the torque values specified in the equipment manual (e.g., 1.2-1.5 Nm for M4 screws).
2.2 Reliability Verification of ground-based systems
Grounding resistance test are conducted quarterly:
Measured ≤ 4 omega using grounding resistance tester.
Check the grounding cables specifications to ensure a cross-sectional area volume ≥ 25 mm2 for primary grounding cable and ≥ 10 mm2 for feeder grounding cable.
For mobile devices, verify a reliable connection between a the yellow-green bicolored grounding cable and the equipment's metal frame to prevent a virtual connection that could cause an electric shock.
Full Lifecycle Management of the Tool System
3.1 Tool selection and Installation Specifications
Material Matching: Select tool material according to material characteristics. For example, cutting BOPP films requires tungsten steel tools (HRC 88-90 hardness), while cutting aluminum foil requires diamond-coated tools.
Install accuracy: use dial indicator to detect the radial runout of the cutter disk, radial pulsation should ≤ 0.02 mm. After installing the blade, perform dynamic balancing tests to ensure the unbalance amount is within 0.5 g·cm.
Angle control: rake angle angle of longitudinal cutting knives shall be 15°-20° and the relief angle shall be 8-12°. The rake angle of the cross-cutter shall be 25°-30° and the relief angle 10-15°, with specific parameters dynamically adjusted according to material thickness.
3.2 Wear Monitoring and Replacement Criteria
Establish tool wear database:
Macroscopies: Check the edge of the blade daily with a magnifying glass (20X) for chips or rollers to observe if there is microscopic damage.
Acoustic Monitoring: The cutting noise frequency spectra is collected through vibration sensors. Tool wear is indicated when the energy value in the 1000-3000 Hz frequency band exceeds 20% of the baseline value.
Replacement Threshold: When wear reaches one third of the thickness of the material, replace the blade. For example, when cutting a 0.05 mm film, if the wear exceeds 0.017 mm, the blade must be replaced.
Condition Monitoring Technologies for moving Componentss
4.1 Vibration Analysis Early Warning System
A three-way vibration sensors is installed on key components such as the main drive shaft and the rotary shaft to collect acceleration signals in real time:
Establish a baseline database of equipment vibration and set alarm thresholds (for example, when the velocity active value exceeds 4.5 mm/s).
frequency spectrum analysis was used to identify fault sources. For example, a prominent 1x frequency may indicate misalignment, while a prominent 2x frequency indicates gear wear.
4.2 Temperature Monitoring Network
Installation of PT100 temperature sensors on axles, motor housings and other components:
Establish a hierarchical alarm mechanism: forced shutdown is triggered when ambient ≤ 60°C, when primary alarm temperature is 60-70°C, and when secondary alarm temperature is greater than 70° C.
Quarterly checks are conducted using an infrared thermal imager to highlight unusual hot spots caused by friction.
Operator Skill Enhancement System
5.1 Graded Training System
Basic level of operation: focus on training in security procedures (e.g. emergency stop button location, guard opening specification) and routine inspection of filling in forms.
Intermediate level of maintenance: mastery of Master lubrication system principles, interpretation of common fault code (e.g., Siemens PLC's F0001 overcurrent fault), simple components replacement techniques.
Advanced Diagnostic Level: Training in specialized skills such as vibration analysis, oil analysis and electrical schematic interpretation, requiring TÜV assessments certification.
5.2 Building a Maintenance Knowledge Base
Establishment of a digital binary system for equipment maintenance:
Integrate 3D device model and mark all maintenance points with an operation video.
Development of a fault diagnosis expert system that automatically recommends solutions by inputting symptom codes.
Record historical maintenance data and optimize maintenance intervals through machine learning (such as dynamically adjusting lubrication intervals based on runtime).
PDCA Preventive Maintenance maintenance cycle
6.1 Plan Formulation (Plans)
Develop an annual maintenance plan based on equipment MTBF (Average Fault Interval Time) data:
Precautionary replacement of Class A components (e.g., main motors, reduction gears) on a quarterly basis.
Conditions-based maintenance of B components (e.g., transmission chains chains, timing belts).
Adopt a post-failure replacement strategy for Class C components (e.g., ordinary bearings).
6.2 Implementation and documentation (doing)
Live record using Mobile Maintenance APP:
Lubricant injection volume (accurate to mL)
Component replacement time (exact to minutes)
Troubleshooting (including photo and video evidence)
6.3 Inspection and Evaluation (Check)
Generate monthly maintenance quality reports:
Calculate improvement in Overall Equipment Effectiveness (OEE)
Statistical analysis of the percentage of fault downtime
Evaluate changes in spare part consumption costs
6.4 Improvement and Optimization (Act)
Analysis of the root causes of HF failures:
Using the 5 whys' 'to trace out the root cause of the problem
Assessment of Evaluate improvement solutions using Failure Mode and impact analysis
Validation of Verify parameter optimization effects by DOE (Experimental Design)
Conclusion:
The maintenance of stickers has shifted from the traditional "failure repair" model to a "predictive maintenance" approach. By constructing a stereoscopic maintenance system covering mechanical, electrical, and tool aspects, combined with IoT technology and big data analysis, the total life-cycle cost of the device is reduced by over 30% and product defect rates of the product is controlled below 0.5%. Enterprises need to set up the concept of ``equipment health management"and transform maintenance work from a cost center to a value creation center, ultimately improving the competitiveness of the entire industry chain.
