On the characteristics of the control system of
????Compared with the general electronic scale, using a computer 10-head combination weigher to perform quantitative weighing, the same work is completed: a 10-head computer combination weigher is needed, 1 operator is operated, the speed is 60 bags / min, and the single bag error is 0.3 ~ 0.5 grams The total error is about 8 kg per day, and the total error is about 3 tons per year. General electronic scale requires 5 sets, 5 operators, speed 12 bags / min, single bag error 2 grams, total error 57 kg per day, total error 20 tons per year. Obviously, the use of computer combination can save the factory 4 labors and 17 tons of raw materials per year. It is not difficult to see that choosing a long combination is a smart choice for businesses.
????Combination scale The combination scale of the manufacturer must be capable of completing more than 70 packs / min (1 pack / s) at work, that is, at least 1s to complete the weight detection, combination calculation, find the best combination, etc., so as to complete a packaging, Among them, the combination calculation is relatively time-consuming, and the high-performance single-chip computer or PLC can directly complete the detection, calculation, and control output, which can not only meet the accuracy requirements of the combined scale real-time control, but also meet the packaging speed requirements, which is a more effective control. the way.
????When the control system is working, the single-chip or PLC sends a signal to the multi-way switch, time-sharing selects 10 weighing sensors, the signal is amplified, A / D converted, input to the single-chip or PLC, and the 10 input values ??are combined and calculated. Obtain the number of a group of weighing hoppers where the best combination is located, and control the speed and direction of the corresponding stepping motor according to the number to make the material door open, complete the discharge, and then close the material door; the material level in the storage hopper is detected by a photoelectric switch Detection. In addition, the system has also designed display, alarm and keyboard circuits to make the system more complete.
????Traditional quantitative automatic packaging scales generally go through the weighing process of coarse measurement and fine measurement, especially the process of fine measurement requires a little addition, which takes a long time and affects the weighing speed. For example, the weighing speed of a quantitative automatic packaging scale under 1 kg is generally 20 to 30 bags / minute, while the computer combination weighs the scale of 14 weighing units in the computer's fast optimal combination operation. The scale can reach 100 to 120 bags / minute. It is 4 to 6 times faster than the weighing speed of the quantitative automatic packaging scale, and is easy to match with various packaging machines. Greatly improve the packaging efficiency, more suitable for the needs of modern production management.
????It is suitable for the rapid quantitative weighing of various granular, flake, strip, spherical and other materials. Such as sweets, fruits (raisins, dates ...), nuts (walnuts, pistachios ...), pet food, roasted foods (melon seeds, peanuts ...), puffed foods (potato chips, shrimp strips ...), frozen foods ( Manufacturers of rice balls, dumplings ...), hardware, plastic pellets, etc. that need to be weighed quantitatively.