System hardware design of multihead weigher

Since its inception in the 1970s, computer multihead weighers have been used in food, medical, chemical, and other industries. Multihead weighers have solved the problem of measuring and packaging uneven materials. It has the characteristics of high measurement accuracy, fast packaging speed, and high performance, especially for some high-value granular or block products, it can be packaged accurately and quantitatively, the accuracy can be controlled within ±1.5 grams, and the fastest weighing speed can reach 240 bags/min. Nowadays, more and more people use multihead weigher, so what is the system hardware design of multihead weigher? Next, let us take a look.

Here is that the content:

• Amplifier

• A/D converter

• Stepper motor drive circuit

• System software design

Amplifier

AD620 is a small, low-power, high-precision instrumentation amplifier. It is suitable for multihead weigher data acquisition systems and multiple conversion application systems.

A/D converter

The successive comparison analog-to-digital converter has high conversion speed and accuracy, low power consumption, and a shutdown mode of 10A power consumption. The conversion time is 9.4s. It has single and double input and three-state serial data output. Way, with sample and hold circuit inside. The multihead weigher is controlled by a single chip microcomputer or PLC to control the A/D conversion process.

Stepper motor drive circuit

The multihead weigher preparation hopper and the weighing hopper have a total of 20 material doors. To make the opening and closing of the material doors smooth and prevent material damage and material jams, the opening and closing of each material door are driven by a stepping motor.

System software design

When the multihead weigher is working, it must complete the capacity of 70 packs/min (1 pack/s) or more, that is, it is necessary to complete the weight detection, combination calculation, search combination, etc. within 1s, to complete the sub-packaging, in which the combination calculation is relatively time-consuming more, high-speed single-chip microcomputers or PLCs can directly complete detection, calculation, and control output, which can meet the accuracy requirements of computer multi-head weigher real-time control and packaging speed requirements. It is a relative control method. When the multihead weigher control system is working, the single-chip microcomputer or PLC sends a signal to the multi-channel switch, and 10 load cells are selected in time-sharing. The signal is amplified A/D converted, and input to the single-chip microcomputer or PLC, and 10 Values are combined to calculate the number of the group weighing hopper where the combination is located, and the speed and direction of the corresponding stepping motor are controlled according to the number, so that the group of material doors is opened, the unloading is completed, and then the material doors are closed; the material in the multihead weigher storage hopper the position is detected by the photoelectric detection switch. In addition, the system is also designed with display, alarm, and keyboard circuits to make the system perfect.

FOSHAN HIGH-TECH MACHINERY EQUIPMENT CO., LTD. is the leader of high accuracy measuring machines manufacturer, with strong economic strength and good products reputation, high-quality study, and service team. To meet the food packing industrial development, we study and produce the advanced standard food packing equipment, such as computerized multihead weigher, material conveyor, vibration feeder, take away conveyor, platform, check weigher, metal detector and so on, fulfill the demands of packing, weighing and checking continually. The above is about multihead weigher for the related content of system hardware design, if you are interested in multihead weigher, you can consult with us and we will answer you in detail. Our website is https://www.hightechgz.com/.