What to consider when purchasing a multi-head
The multi-head microcomputer combination said that at work, it must have the ability to complete more than 70 packs / min (1 pack / s), that is, at least 1s to complete weight detection, combination calculation, and find the best combination, etc., so as to complete a packaging, including The calculation is relatively time-consuming, and the high-performance single-chip or PLC can directly complete the detection, calculation, and control output. It can not only meet the accuracy requirements of real-time control of multi-head microcomputer combination, but also meet the requirements of packaging speed. 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.
The first thing to consider when purchasing a multi-head microcomputer combination weigher is whether the multi-head microcomputer combination weigher matches the production line. The general multi-head microcomputer combination weighing quantitative weighing packaging system is mainly composed of multi-head microcomputer combination weighing, vertical packaging machine, vibrating feeder, Z-type conveyor, support platform and so on. The weighing speed of multi-head microcomputer combination weighing mainly depends on the number of weighing hoppers involved. The more weighing hoppers, the faster the weighing speed. If the user already has an existing packaging machine, the speed of the multi-head microcomputer combination weigher should refer to the operating speed of the packaging machine, but the speed of the multi-head microcomputer combination weigher should be slightly higher The operating speed of the packaging machine.
Secondly, we must consider the characteristics of the product's weighing range, material size, shape, and whether or not it is sticky. If the weighing range and the material are large, a multi-head microcomputer combination weighing of 14 or more heads should be considered. The feed hopper and weighing hopper in contact with the material should be anti-sticky. Generally, the embossed scale weighing hopper is selected, otherwise the speed and accuracy of the multi-head microcomputer combination weighing will be affected.
The third factor is the weighing accuracy of the multi-head microcomputer combination weigher. Although the multi-head microcomputer combination is said to be a very mature product, the accuracy of load sensors used in these measurements is not the same. Some multi-head microcomputer combinations are called analog signals. At present, the analog signals are basically pirated scales. The scale mainly has problems with unstable performance, easy to burn motherboards, and second-hand sources of IC patches. The major problem is that the product has a problem There is basically no ability to improve. Some are digital weighing, such as Jingwei, which mainly produces waterproof multi-head microcomputer combination weighing, all using digital high-precision weighing signals, which is a perfect combination of accuracy and speed.