Multihead Weigher Machine
Multihead weigher machine, also known as combination weigher or combination scale, is weighing equipment with fast measurement speed & high accuracy.
The multihead weigher machine’s working principle is based on combined weighing, mathematical combination calculation is essential in the weighing process.
It combines multiple weight hoppers’ measurements to get many results, these results are both close to the target weight.
Then, it confirms the final result among the candidates, and the final result is closest to the target weight.
Such multi weigher is popular in food packaging, medicine, chemical, and other industries, and is quite suitable for weighing granular items (irregular shapes & uneven weight), such as candies, frozen aquarium food, chocolates, seeds, etc.
According to the weighing hoppers’ qty, multi weigher can be divided into 8, 10, 12, 14, 16, 20, 24, 32 head types, each weighing hopper is a separate scale.
With reference to the following schematic diagram, you can understand the multi head combination weigher’s components clearly.
Multi head combination weighers usually consist of multiple weighing units, each weighing unit includes a storage hopper & a weigh hopper, a microcomputer controls the storage hopper & weigh hopper.
To better understand the combination weigher’s working process, please refer to the following workflow chart.
- Material Feeding
1st, the bucket elevator transports the material to the infeed funnel, then the main vibrator pan vibrates the material to each linear vibrator pan.
By adjusting the infeed funnel’s height, you are able to adjust the material thickness on each linear vibrator pan.
The material thickness affects the weighing speed & accuracy.
If the material is too thick, it will affect the accuracy;
And if the material is too thin, it will affect the speed.
- Dosing & Weighing
After the material enters each linear vibrator pan, the linear vibrator pan feeds it to the storage hopper.
The storage hopper awaits command to release material, which usually arrives after the weight hopper has completed its last weighing cycle.
Read the weight of each weighing hopper, combine them according to the target weight, get many qualified combinations, then select a combination that is closest to the target weight.
The head weigher finally discharges the weighed materials to downstream equipment.
4 types of discharging are optional:
- Direct Discharging
The multi head scale directly drops the materials from discharge funnel.
- Timing Hopper Discharging
After the materials fall from the lower discharge funnel, they first enter the timing hopper.
Then, the timing hopper releases the materials to the downstream equipment.
Such discharging concentrates the material, shortens the time for materials to fall to downstream equipment.
- Timing Hopper Distribution
The materials fall into the timing hopper first, then according to the two downstream equipment’s signal, the head weigher releases the materials to one equipment.
This discharging takes advantage of the combination weigher’s high-speed feature.
- Timing Hopper Screening
If unqualified materials exist, the waste discharge motor automatically starts to remove them, discharge them to the recycle port.
In this way, unqualified products have no chance to move on to the next process.
The head weigher has developed rapidly since its appearance in 1972, which is mainly due to its following features.
- High Weighing Accuracy
The head weigher guarantees the weighing accuracy through the following 3 aspects.
- Two Sampling Sessions
For example, the certain 4 weighing units’ combination result is most suitable, but the multi head combination weigher does not immediately release the materials, it samples their weight data for the 2nd time.
Only if these two sampling results are the same, the weighing hoppers can receive a release signal.
Otherwise, the multi head combination weigher will perform combination again, ensuring the weighing accuracy.
- Leftover Cleanup
During the weighing process, there will always be leftovers in the hopper.
With leftovers, the next weighing result is definitely higher than the actual weight.
So, when discharging the material, the multi head combination weigher will open the hoppers several times, ensuring no leftovers in the hoppers.
- Auto Zeroing
Whatsmore, the multi head combination weigher has auto zeroing function, auto zeroing ensures the next weighing is precise.
- Fast Weighing Speed
A computerized system controls the entire weighing process.
When a signal comes in, the computerized system takes the corresponding computing, then sends out the signal to facilitate the subsequent actions.
The stepping motor can accurately control the weighing hopper’s opening/closing size & speed.
- Save Labor & Raw Materials
Compared with general electronic scales, multi head scales can save labor & raw materials.
For example, a candy factory (or pistachio, 4g/piece), 200g/bag, 16 working hours a day (2 shifts), 300 working days a year, and an annual output of 3400 tons.
According to the comparison, 10 head multihead weigher VS. 5 general electronic scales, the former can save 8 labor & 53.56 tons of raw materials a year.
On Jun 23, 2021, a Dutch client sent us an inquiry.
He requested us to customize a multi head packing machine, for packaging 250-1000 grams of seeds per dropping.
Such machine should integrate a vertical cartoner & a head weigher.
SiroSilo has strong customization & integration ability, if you plan to purchase a head weigher or multi head packing machine, please send us an inquiry on this site.
We will get back to you within 1h.
SiroSilo could also supply the following products:
Multihead Weigher Machine Ultimate FAQ Guide
Multihead Weigher Working Principle
The multihead weigher’s working principle can be summarized by the 4 steps of material feeding, storing, weighing, and discharging.
When the head weigher is working, it carries out these 4 steps cyclically.
The bucket elevator transports & concentrates the materials to the main vibration plate, then the main vibration plate feeds the materials to the linear vibration plate.
The linear vibration plate dumps the materials to each storage hopper, the storage hopper stocks the materials for a while.
The stepping motor starts to work, it opens the storage hopper, the storage hopper sends the materials to the weighing hopper.
According to each weighing hopper’s weight, the control system starts combination calculation, selects the best combination, and issues a discharge signal.
The discharge signal drives the stepping motor to open the selected weighing hoppers, the material fall into the chute, and then into the timing hopper.
If there is no timing hopper, it will directly enter the packaging machine.
How Does A Multi Head Weigher Calculate Combinations?
The multi head weigher first appeared in the 1970s, its weighing principle originates from the permutation & combination algorithm in mathematics.
At present, the 10 head and 14 head combination weighers are the most popular in the world.
Now, take a 10 head combination weigher as an example.
Suppose that the material weights (in grams) in the weighing hoppers from No. 1 to No. 10 are as follows:
The target weight is 100±0.5.
From the above value, we can find:
No. 1 (28.5) + No. 3 (31.9) + No. 6 (20.5) + No. 10 (19.1) = 100 grams.
Adding several weighing hoppers’ weights, the result is equal to the target weight of 100±0.5 grams.
By combination calculation in this way, the combination weigher realizes precise weighing each cycle.
What’s more, the combination weigher adopts a high-performance weight sampling & data processing chip, the whole weighing time is about 0.7s, the weighing is also quick enough.
10 Head Multihead Weigher
The 10 head multihead weigher is a high-precision industrial scale, it contains 10 weighing hoppers controlled by a microcomputer, the food industry widely uses it for precise weighing.
The following foods’ precise weighing realizes on 10 head multihead weigher:
- Melon Seeds
- Frozen Seafood
- Pet Food
- Puffed Food
For the precision weighing of granular, flake, strip, round, and irregular shape items such as big shell nuts, hardware, plastic pellets, etc., a 10 head multihead weigher is also capable of finishing it.
14 Head Weigher
The 14 head weigher is also a high-precision industrial scale, a microcomputer controls it.
This industrial scale contains 14 storage hoppers & 14 weighing hoppers, it weighs faster than the 10 head multihead weigher.
Like the 10 head multihead weigher, the 14 head weigher is also suitable for precision weighing of snack foods, irregular-shaped nuts, hardware, plastic particles, plant seeds, etc.
Multi Head Weigher Parts
The multi head weigher parts are clearly marked out in the following photo, please check it for reference.
Multihead Weigher Bucket
The multihead weigher’s bucket is also called a hopper, as shown in the photo below.
The bucket on the multi head combination weigher mainly includes a storage hopper & a weighing hopper.
The storage hopper continuously feeds materials to the weighing hopper cyclically, ensuring fast weighing.
Multihead Weigher Manufacturers
As the food industry has a large demand for multi head weighing machines, multihead weigher manufacturers are located all over the world.
The figure below lists the world’s top multi weigher manufacturers.
By browsing these companies’ websites, you can get cutting-edge information about multi head weighing machines & related market.
Multihead Weigher Manufacturers In China
China also has many multihead weigher manufacturers, they are concentrated in the developed Pearl River Delta & Yangtze River Delta regions.
SiroSilo is one of China’s professional multi weigher manufacturers.
SiroSilo’s third-generation multi head scales have two-year warranty, the following photo displays its attractive features:
If you plan to purchase a multi head scale in the near future, you are welcome to send an inquiry on this website, we will reply to you within 1 hour.
We also welcome you to visit our factory or video call with us, we can lively broadcast our factory to you.
Multihead Weigher Price
In the Chinese market, some manufacturers produce high-quality combination weighers, 2 years warranty & a high price;
Some manufacturers supply multi head scales of normal quality, 1-year warranty, the price is relatively lower.
The picture below shows the multi weigher’s reference price in the Chinese market, you can refer to it when purchasing multi weighers from China.
Multihead Weighers Market
In 2017, the global multi-head weighing machine market volume has reached 203.2 million U.S. dollars, this value will increase to 291.65 million by 2027 according to evaluation.
Regarding the current multi-head weighing machine market, the food industry occupies more than 80% of the share.
Grains, seeds, ready-to-eat foods, fresh produce, candy, snacks, meat, poultry, seafood, etc., multi-head weigher weighs them in many food & beverage factories;
Pharmaceutical, chemical, hardware, spare parts, and other industries introduce multi head scales for weighing too.
The 14 head weigher has become a hot-selling product in the global market, its weighing accuracy & speed improves greatly.
As the multi head scale technology upgrades continuously, and the food industry’s product categories continuously enrich, the multi head weighing machine’s future market is still very broad.
Multi Head Weigher Manual
We will include the hard copy multi head weigher manual in the packaging wooden box before shipment.
For the digital version, we will share it with you via email or WhatsApp, you can contact us first, then offer your email address or WhatsApp ID.
Multi Head Packing Machine
Multihead packing machine is a fully automatic packaging machine integrated with precision weighing equipment.
Generally, the multi head packing machine includes the following equipment:
- Vibration Feeder
- Z Conveyor
- Multi Weigher
- Working Platform
- Vertical Packaging Machine
- Outfeed Conveyor
- Rotary Collecting Table
Please refer to the following video, then you can better understand the multihead packing machine’s working process.
Multihead weigher packing machine has a wide range of applications, it is suitable for packing jellies, nuts, biscuits, frozen foods, grains, seeds, salad vegetables, etc.