Pharmaceutical filling machines are designed for accurate filling and sealing of pharmaceutical products such as injections, oral liquids, powders, and ointments. Depending on the material characteristics and container type, the machine is generally divided into six major systems: material supply, filling, container handling, sealing, control, and auxiliary systems. These systems work together to complete the filling process.
1. Material Supply System
The material supply system delivers the product to the filling station at a stable and controlled rate. Different supply methods can be selected according to the material form.
1.1 Liquid Material Supply
Pressure-based feeding uses low-pressure air in a closed storage tank together with a flow-control valve to regulate material delivery. It is suitable for injectable solutions, oral liquids, and other low-viscosity liquids.
Volumetric feeding uses a rotary lobe pump, gear pump, or peristaltic pump to control the delivery volume. This method is suitable for high-viscosity liquids or liquids containing small amounts of suspended particles.
1.2 Powder and Ointment Supply
A screw feeder uses a stepper motor to rotate the screw and deliver powders or fine particles to the filling head at a controlled rate.
A piston-type feeding cylinder uses servo-controlled reciprocating motion to meter ointments and semi-fluid materials accurately.
2. Filling System
The filling system is the core part responsible for accurate and consistent dosing.
2.1 Filling Head Assembly
Depending on the formulation, the filling head can use structures such as piston pumps, peristaltic pumps, screw dosing mechanisms, or piston cylinders.
Filling nozzles are typically made from pharmaceutical-grade stainless steel and can incorporate anti-drip structures to reduce material residue and cross-contamination.
For containers of different heights, the lifting mechanism adjusts the nozzle position to maintain stable filling and reduce splashing.
2.2 Filling Control Unit
Servo or stepper motors control the operating speed and stroke of the dosing mechanism. Flow monitoring can also be integrated to adjust the filling process and improve volume consistency from container to container.
3. Container Handling System
This system automatically sorts, conveys, and accurately positions containers at the filling station.
3.1 Bottle Sorting Machine
Rotary plates, star wheels, or similar mechanisms organize randomly oriented ampoules, vials, and oral liquid bottles into a consistent direction.
3.2 Conveying Track
Stainless steel chain conveyors or guide rails transport the containers. Photoelectric sensors detect container positions and enable accurate stopping at the filling station.
3.3 Bottle Separating Mechanism
A cam-driven or similar separating mechanism spaces continuously conveyed containers at a fixed pitch, matching the arrangement and operating cycle of the filling heads.
4. Sealing System
The sealing method is selected according to the container type.
Ampoules are commonly sealed by flame or laser sealing, which melts the neck to form a closed seal.
Vials generally use a crimping mechanism to secure an aluminum-plastic cap onto the vial neck.
Oral liquid bottles can use servo-driven capping mechanisms that apply controlled torque to achieve reliable sealing.
5. Control System
The control system manages machine logic, production parameters, and operating status.
5.1 Main Control Unit
A PLC combined with an HMI allows operators to set key parameters such as filling volume, operating speed, and sealing conditions while monitoring the overall machine status.
5.2 Sensor and Monitoring Unit
Photoelectric sensors detect containers and material conditions, pressure sensors monitor supply pressure, and torque sensors monitor torque during capping. These functions support automatic start/stop control and fault alarms.
5.3 GMP-Related Functions
Depending on production requirements, the machine can incorporate CIP cleaning interlocks to support cleaning between product changeovers and meet applicable clean-production requirements.
6. Auxiliary Systems
Auxiliary systems support stable machine operation and production-environment requirements.
The cleaning and sterilization system can include CIP and SIP functions for online cleaning and sterilization of product-contact pipelines, valves, and other components.
The dust removal system is mainly used for powder filling applications. Negative-pressure extraction collects dust generated during production and helps maintain a cleaner working environment.
The safety protection system can include emergency-stop buttons, safety light curtains, and protective enclosures to reduce operational risks.
The material buffer system uses storage tanks or intermediate hoppers to maintain continuous material supply and reduce downtime caused by frequent refilling.
For non-standard mechanical components used in pharmaceutical filling machines, such as filling heads, positioning components, fixtures, bushings, shafts, and mounting brackets, Hansheng Automation provides precision custom machining based on customer 2D or 3D drawings. Depending on the component structure and application requirements, we can use CNC turning, CNC milling, precision grinding, and other suitable processes to meet equipment assembly and operating requirements.
