In the fully automatic assembly lines for laparoscopic ligating clips and stainless steel clips, the core of increasing PPM (Parts Per Minute) is to eliminate station bottlenecks, optimize material flow, enhance automation precision, and reduce quality rework, while ensuring the cleanliness and compliance of medical consumables. Combined with synrit's technical accumulation in the field of non-standard automation, targeted production line optimization can significantly improve production efficiency on the premise of complying with medical industry standards.

The assembly line of laparoscopic ligating clips usually includes core stations such as stainless steel clip feeding, visual inspection, ligating clip feeding and positioning, clip assembly, finished product visual inspection and blanking. Line imbalance is the primary factor restricting PPM — a slow speed of any station (such as precision assembly and visual inspection) will cause waiting in the front and rear processes, reducing the overall production capacity.

Accurately measure cycle time: Use a production line data collection system to count the average time required for each station to complete a set of ligating clips, and identify bottleneck stations (such as manual material replenishment and multi-station synchronous assembly).

Task splitting and merging: Split the non-core operations of bottleneck stations (such as auxiliary material preparation and data recording) to auxiliary stations, or merge low-load inspection stations, so that the difference in cycle time between each station is controlled within 10%.

Visual monitoring: Create a line balance chart to display the load of each station in real time, facilitating the rapid adjustment of personnel and equipment configuration.

Medical consumables have extremely high requirements for material cleanliness and feeding precision. Invalid material handling and picking actions are important sources of efficiency loss:

Upgrade automatic feeding system: Adopt a vibratory bowl + visual positioning feeder to realize automatic sorting and feeding of ligating clip bodies, stainless steel shrapnels and buckles, avoiding the risk of line shutdown and pollution caused by manual material replenishment.

Station layout optimization: Adopt tray loading and unloading mode, which can place 10 empty trays at a time, enabling operators to complete auxiliary operations in the clean operation area and reducing invalid actions such as walking and bending over.

In response to the high-precision requirements of ligating clip assembly, optimizing automation units can greatly increase PPM while ensuring product consistency:

Robotic precision assembly: Adopt Delta/Huichuan servo drive to realize micron-level precision assembly of buckles and shrapnels, with a speed 4-6 times higher than that of manual operation;

Online visual inspection: Integrate Omron/Xinruite visual system to detect assembly deviations and appearance defects in real time, replacing manual visual inspection and improving detection speed and accuracy;

The production of medical consumables must strictly follow industry standards. Optimizing management processes can reduce unplanned shutdowns:

Preventive maintenance: Regularly maintain visual systems, servo motors and pneumatic components (Airtac brand) to avoid production line shutdown caused by equipment failure, ensuring that OEE (Overall Equipment Efficiency) is stably above 85%.

Clean environment control: Optimize the air flow and personnel movement in the clean area to reduce production interruption caused by excessive environmental indicators.

Inefficient quality inspection can easily become a production line bottleneck, which can be optimized in the following ways:

Error-proof design (Poka-Yoke): Add error-proof mechanisms (such as anti-reverse insertion positioning pins and material shortage detection sensors) at the assembly station to reduce assembly defects from the source and lower the rework rate.

No. The core of increasing PPM is to eliminate waste and bottlenecks, not to compress the necessary clean control and quality inspection time. Through solutions such as automatic feeding and closed assembly, it can instead reduce manual contact, lower the risk of pollution, and comply with medical industry standards such as ISO 13485.

 

Prioritize starting with line balance optimization, semi-automatic feeding introduction and visual inspection upgrade. These measures do not require large equipment investment and can achieve a 15%-30% increase in PPM. For example, by optimizing the station layout and using a simple vibratory bowl for feeding, the time for manual material replenishment and waiting can be quickly reduced.

 

The effect can be quantitatively evaluated through the following indicators:

Average cycle time of a set of ligating clips (target: shortened by more than 20% compared with before optimization);

Production line OEE (Overall Equipment Efficiency, target: increased to above 85%);

Change trends of unit time output (PPM) and defect rate;

 

Stations with high manual operation ratio, strong repetition and high precision requirements, such as material feeding, buckle precision assembly and visual appearance inspection, are the priority choices for automation transformation. These stations have the highest return on investment in automation, which can quickly increase PPM and ensure product consistency.