Introduction: The computer combination scale is also called a combination weighing instrument. It is composed of a plurality of weighing units with separate feed and discharge structures. The general computer combination scale consists of 8 to 32 weighing units. The computer uses the permutation and combination principle to automatically calculate the load of each weighing unit, and obtains the combination of the best and closest quantitative values ​​for packaging. As shown in the figure, for example, a computerized weigher with ten weighing units, each weighing unit is weighed when weighing, and the weight data in each weighing hopper is read into a computer and optimized by a computer. Combining, according to the combined figures, ten weighing units can achieve a total of 1023 combinations, and the computer selects the combination closest to the target weight value from the 1023 combinations. In this way, the above-mentioned man-made repetitions and the difficulty in realizing quantitative values ​​can be solved.
Technical advantages of computer combined scales
1〠High weighing accuracy
The computer combination scale ensures weighing accuracy from the following three aspects:
a, secondary sampling
For example, a computerized weigher with ten weighing units described above reads data from ten weighing units in a weighing process at a time as the first sampling, and the computer obtains data and then performs a preferred combination; if three weighings Instead of weighing the unit, the weight data of the three weighing units are sampled again. This is the second sampling. If the two sampling data are inconsistent, the computer will recombine the data. The data from the two samplings is the same and the computer scales discharge; this ensures that the weight of the discharged material is exactly the same as the predetermined weight.
b, automatic zero function
Due to the fact that some of the dust of the object being weighed in the weighing process will not fall on the weighing hopper wall, it will affect the accuracy of the next weighing. The solution to solve this problem in the computer combination scale is as follows: (1) When the material is released, the weighing hopper is generally opened 4-5 times to reduce the residual amount of the dust of the object being called. 2 The computer combination weigher will automatically zero the weight of the weighing hopper, that is, the dust stuck to the weighing hopper is regarded as zero weight, which does not affect the accuracy of the next weighing.
c, against ground vibration
The general computer combination scale is working in the workshop, and often the power motor equipment in the workshop is running to generate vibration on the ground. The human body generally cannot feel this kind of vibration, but it will be sensed by the high-sensitivity computer combination scale and make the weighing data. Unstable For this computer combination scale, add an inductive vibration sensor in addition to the load cell and remove the sensed vibration component from the weighing sensor data to obtain reliable data.
2, weighing speed
a, digital signal processing technology
The digital processing of the computerized combination scale is performed by a dedicated computer chip, which ensures that the weighted analog signal is converted into a digital signal after fast digital filtering, thereby ensuring that there is time to complete the aforementioned "secondary data sampling" function.
b, the stepping motor controlling the opening and closing of the hopper
Due to the controllability of the stepping motor, the opening and closing speed and the size of the weighing hopper can be adjusted, and the weighing hopper can be opened and closed to a small speed in order to achieve high speed.
c. Adjustable feed slot
The vibration amplitude and vibration time of the vibration tank are adjustable, and the adjustment is subtle, which can meet the requirements of accuracy and speed. Another important feature of computerized combination scales is that according to different materials, there are corresponding application technologies, such as waterproof type, fragile type, easy-to-stick type, mixed weighing, number of weighing, etc., applicable to all aspects. need.
The birth of the computer combination scale has created a new era of quantitative packaging in the world. Due to its high weighing speed, dynamic precision, and high degree of automation, it has been widely used in packaging potato chips, candy, puffed foods, biscuits, frozen vegetable foods and other industries. The quantitative packaging.
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