In the field of automated packaging of granular and lumpy materials, multihead weighers have become the core equipment for achieving high-speed quantitative packaging. Compared with traditional weighing methods, their advantages in efficiency and accuracy are very significant.
Working principle
A multi-head scale granule packaging machine typically consists of the following modules:
1. Vibrating Feeding System: Material is evenly dispersed through the main vibrating plate and distribution trough. The vibrating plate can adjust the amplitude and frequency according to the material characteristics to ensure continuous and stable material flow.
2. Weighing Hoppers (Weighing Units): Each hopper is independently equipped with a high-precision weighing sensor. It is responsible for real-time acquisition of material weight data. The weight of a single hopper is usually controlled to be around 1/number of hoppers of the target weight.
3. Combination Control System: The controller (PLC or high-speed MCU) inputs all weighing hopper data into the combination algorithm. Within tens of milliseconds, it calculates the hopper combination closest to the target weight and outputs a command to open the corresponding hopper, completing a precise material discharge.
4. Packaging Machine Module: The back-sealing or other type of packaging machine receives the material. It completes bag forming, filling, and sealing. Synchronized with the multi-head scale cycle, it achieves assembly line operation.
Process Summary:
Vibrating Feeding → Independent Weighing → Combination Calculation → Precise Material Discharge → Finished Product Packaging
How can it be both fast and accurate?
When the machine is working, the material first enters the vibrating feeder from the hopper and is evenly distributed into each small hopper. Each hopper has its own sensor, independently weighing the material inside. Then, the control system selects a combination from all the hoppers to make the total weight closest to the target value. For example, if the target is 100 grams per bag, the system might select hopper combinations of 30 grams, 35 grams, and 35 grams, thus achieving the target. Because the machine directly selects the combination closest to the target each time, instead of slowly adding or subtracting like manually, the weight of each bag is very stable, and the error is naturally very small.
At the same time, the speed is very fast because the entire process is parallel and cyclical. All hoppers weigh simultaneously, and material dispensing and the next round of weighing can be carried out at the same time, without waiting time. It's like several people grabbing material and selecting combinations simultaneously, rather than one person grabbing it one by one. Combined with vibrating feeding and pre-stored hoppers to ensure stable weight in each hopper, the system can quickly find the optimal combination and dispensing material each time, making packaging both fast and accurate.
Simply put, the reason why multi-head scales are fast and accurate is that they transform the weighing process, which originally required manual adjustments, into a process where multiple bins weigh simultaneously, automatically pick and combine materials, and complete the process continuously. Each time the material is dispensed, it almost exactly reaches the target weight, and the entire packaging line operates continuously, making it both efficient and material-saving.
As the packaging industry continues to develop, multihead weigher granule packaging machines will keep evolving in terms of efficiency, precision, and adaptability to different materials. Equipment with higher hopper counts, more stable feeding systems, and improved structural design will be able to handle a wider range of granular and lumpy products while maintaining fast, continuous operation. With these improvements, multihead weighers will continue to play a central role in large-scale packaging lines, helping manufacturers increase productivity, reduce material waste, and ensure consistent product quality.
