A mult-ihead weigher is a weighing machine that can quickly and accurately measure the weight of items to be packaged. As an important component of the packaging machine, it is usually used in items packaging projects that require high weighing accuracy
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The multihead weigher was invented by Ishida in 1970, and it was first used in the field of food packaging. With the increasing demand for packaging accuracy in various fields, the multihead weigher is playing its function in more fields. Usually, it will form a complete packaging system together with a packaging machine (especially a vertical seal packaging machine).
The multihead weigher work by matching the weights of multiple hoppers to ensure that the preset package weight is reached. The multihead weigher has multiple small hoppers, and continuously obtains a part of the material to be packaged from the main hopper. Due to the characteristics of the material itself (difference in monomer volume, shape, weight) and the uneven feeding of the hopper, the weight of the material to be packaged distributed to each small hopper will be different.
Suppose we preset a package with a net weight of 60 grams, and our multihead weigher has 10 small hoppers for weighing. After weighing, the weights of the items to be packaged in each small hopper are 19.5, 20.3, 22.1, 19.9, 18.9, 20.2, 20.4, 21.3, 19.3, 20.3
At this time, the microcomputer processor of the multihead weigher will calculate the weighing value of the above 10 small hoppers to obtain the result closest to 60 grams. Then the correct weighing selection should be hopper 1 + hopper 2 + hopper 6; Hopper 7 + Hopper 9 + Hopper 10. As shown below.
According to the working principle of the above figure, hopper 1, hopper 2 and hopper 6 together form a standard weight to be packaged. Hopper 7, hopper 9, hopper 10 together constitute a standard weight to be packaged. At this time, their hoppers will tilt to dump the contents of the hoppers into the bags. The remaining hopper 3, hopper 4, hopper 5, and hopper 8 cannot accurately match the weight, so the hopper does not tilt during this round of weighing.
The main hopper is fed for the next round. The 6 small hoppers that were empty after dumping are filled again. At this time, the microcomputer processor of the multihead weigher performs the weighing calculation again and selects 3 suitable small hoppers for Dump, and then the material is packaged.
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The multi head weigher is a newly emerging mechanical equipment recently. This multi-head weigher uses a high-precision load cell to instantly select a suitable combination from a wealth of weight combinations through computer calculation. Now the multi-head weigher has been sold all over the world and has been well received by users.
This is the picture of multi head weigher:
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The working principle of multi-head weigher:
1. In the upper feeding hopper, the material is vibrated through the main vibration plate, so that the material is distributed on the conical funnel to the linear vibration plate.
2. When there is no or not enough material in the line vibration plate, it will be detected by the material re-module. This is to send a feeding signal to the main board, and then send a feeding signal to the material conveyor through the main board to feed until the material is detected.
3. The line vibration machine vibrates, drives the line vibration plate to vibrate, adjusts the appropriate amplitude and vibration time to send a certain range of material weight to each village hopper.
4. The driving device is a stepping motor, and the door of the storage hopper is opened, and the material is sent to the weighing hopper. When there is no material in the weighing hopper below or when there is not enough material in the weighing hopper, the village hopper will automatically open the door to put the material in We are all weighing.
This is the packaging machine with multi head weigher:
5. In the weighing hopper, the weight signal is generated by the sensor through the sensor, and then transmitted to the main board of the control device through the lead. The CPU on the main board reads and records the weight of each weighing hopper, and then calculates, analyzes, and combines them. Filter out the combination weighing hopper closest to the target weight. When receiving the unloading request signal sent by the packaging machine, the CPU sends a signal to start the weighing hopper motor driver to open the selected weighing hopper and unload the product into the feeding trough. Packing Machine.
6. When the weighing hopper has finished placing the materials, the multi-head scale will send a signal to the packaging machine that it has been discharged, and the packaging machine will start to seal and cut the bag when the packaging machine receives the signal. The multi-head weigher sends a request signal to call the multi-head weigher to unload, and so on.
The comprehensive look of the packing machine with weigher:
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