Precision Pre-Measuring Device for Box Sealing Machine
In an automatic box sealing machine, efficiency depends on how quickly and accurately the system can adapt to different carton sizes. The pre-measuring device is a key module designed to automatically measure the length, width, and height of each carton before sealing. By transmitting this data to the main control unit, the sealing parameters—such as glue path, spray duration, and sealing height—are adjusted automatically, ensuring consistent sealing quality and higher overall throughput.
Working Principle of Pre-Measuring Device
When a carton moves along the roller conveyor, it passes through the pre-measuring section.
The mechanism operates based on a mechanical guide rod compression system:
1. Detection Entry
As the carton arrives, the guide rods on both sides and above the conveyor automatically move downward and inward to make contact with the carton surface.
2. Dimensional Measurement
- The horizontal displacement of the side guide rods determines the carton width (W).
- The vertical stroke of the top rod detects the height (H).
- The travel distance on the conveyor identifies the length (L).
All measurements are collected through precision encoders and position sensors.
3. Data Transmission
The system transmits the measured dimensions via an Ethernet or CAN bus network to the main PLC of the sealing unit.
This real-time communication ensures that the sealing machine instantly adjusts its parameters—without manual input, significantly enhance the sealing efficiency.
System Integration of Box Sealing Machine
Once the data is received, the main host automatically:
- Adjusts glue spraying positions and route length.
- Sets the height of the sealing head for upper or side sealing.
- Regulates the conveyor spacing and pressing stroke based on carton height.
This integration enables continuous mixed-size carton packaging without line stoppage or manual calibration.
Technical Highlights of Box Sealing Machine
| Function | Description |
|---|---|
| Measuring Method | Mechanical guide rod compression with encoder feedback |
| Detection Range | L 300–2800 mm / W 400–1200 mm / H 36–350 mm |
| Measurement Accuracy | ±2 mm |
| Transmission Protocol | Ethernet / CAN bus |
| Processing Speed | ≤ 40 m/min |
| Control Logic | Real-time PLC communication and auto parameter mapping |
| Applicable Equipment | Hot melt glue carton sealing machines, folding units, case erectors |
Performance Advantages of Box Sealing Machine
- Full Automation: Automatically identifies carton size and adjusts sealing parameters.
- Stable Accuracy: Mechanical compression method ensures consistent readings, unaffected by carton color or reflectivity.
- High Throughput: Enables uninterrupted operation for mixed-size packaging, improving line efficiency by 25–30%.
- Easy Maintenance: Modular design allows the measuring unit to be serviced independently from the sealing section.
Conclusion
The pre-measuring device serves as the “eye” of the automatic carton sealing line. By using a mechanical guide rod system to measure carton dimensions in real time and synchronizing data with the main control, it eliminates manual adjustments, reduces downtime, and achieves high-efficiency, adaptive sealing for multi-size packaging lines.
