I. Core Functional Components of powder packing machine
Storage and Feeding System
Storage Silos/Hoppers: Used to temporarily store powder materials awaiting packaging. They are typically equipped with observation windows and agitators to prevent material bridging.
Elevators/Feeding Devices: Transport materials from a lower level to the storage silos (e.g., screw conveyors, vacuum feeders).
Agitators/Bridging Devices: Installed inside the hoppers, they prevent powder agglomeration or bridging through mechanical agitation or vibration, ensuring smooth material flow.
Metering System (Key Components)
Metering Devices: This is the core component determining packaging accuracy. Common types include:
Screw Metering Machine: The most commonly used. It measures powder by controlling the number of rotations of a precision screw. Suitable for most fine and ultrafine powders.
Measuring Cup Metering: Measuring by adjusting the volume of the measuring cup. It is relatively fast and suitable for powders with good flowability.
Net Weight Scale (Combination Scale): Dynamically weighs and combines multiple weighing hoppers and sensors. It offers the highest accuracy and is suitable for high-value products or products requiring extremely high precision.
Gross Weight Scale: Weighs and fills the packaging bags directly after bag making, compensating for bag weight errors.
Sensor and Control System: Monitors and controls the measurement in real time.
Bag Making and Forming System
Wrapper: The shaft that mounts the packaging film roll, usually equipped with a tension control device.
Former: The core component, folds the flat film roll into a preset bag shape (e.g., back-seal bag, three-side seal bag, four-side seal bag) using a specific shaped mold (e.g., elephant trunk type, lapel type).
Film Pulling Mechanism: Grippers or rollers driven by a servo motor or stepper motor, precisely pulls the film downwards a bag length.
Longitudinal Sealing Device: Heat-sealing rollers or seals continuously heat-seal the longitudinal seams of the film.
Filling System
Feed Hopper/Guide Tube: Connects the metering outlet and the packaging bag opening, guiding the powder accurately into the bag, and equipped with dustproof and anti-static design.
Opening Device: Before filling, a suction cup or airflow opens the bag opening to prevent powder from adhering to the sealing area and affecting the seal.
Dust/Air Suction Device: Air suction ports are installed around the filling port to remove dust generated during filling, maintaining cleanliness and improving sealing quality.
Horizontal Sealing and Cutting System
Horizontal Sealing Device: The core actuator, typically a pair of heat-sealing clamps with heating and cooling functions. It performs two actions:
Sealing the top of the current bag.
Simultaneously sealing the bottom of the next bag (bottom seal).
Cutting Device: Located in the middle of or immediately following the horizontal sealing clamps, it cuts and separates the film between the upper and lower bags. It can be hot-cut (integrated sealing and cutting) or cold-cut.
Drive and Frame
Main Drive System: Includes a servo motor, reducer, synchronous belt/pull, cam mechanism, etc., providing precise and synchronized power for film pulling, horizontal sealing, and other actions.
Machine Body and Frame: A robust stainless steel structure supports all components, ensuring stable operation.
II. Control and Auxiliary Systems
Electrical Control System
Industrial PLC: The brain of the entire machine, receiving instructions, processing signals, and controlling the logic and sequence of all actions.
Human-Machine Interface (HMI) (Touch Screen): The interface for operators to set parameters (such as bag length, speed, temperature, weight), monitor operating status, and diagnose faults.
Servo Drivers and Motors: Provide high-precision, programmable position and speed control for critical actions such as film pulling and horizontal sealing.
Detection and Feedback System
Photoelectric Mark Sensor: Detects color marks on the packaging film, ensuring accurate pattern positioning and consistent cutting positions.
Temperature Controller: Precisely controls the temperature of horizontal and vertical sealing to adapt to different packaging film materials.
Safety Protection: Emergency stop button, safety door lock, overload protection, etc.
Auxiliary Devices (Optional)
Coding Machine/Instrument Printer: Prints production date, batch number, and other information before or after sealing.
Checkweigher: Performs online weight detection on finished bags, automatically rejecting overweight or underweight products.
Exhaust system: After filling, vibrates or squeezes the powder bags to expel excess air before sealing, resulting in a smoother finished product.
Conveyor belt: Outputs and collects the packaged bags.
Dust collector/collection device: Connected to the filling port, it centrally processes and collects dust, maintaining a clean workshop environment.
Nitrogen filling or vacuum system: Used for powder products requiring preservation and oxidation prevention.