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First of all, from the installation to meet the requirements of the length of the upstream straight pipe, standard instrument installation, choose a place away from the heat source, the rational use of the flow rate of the pipeline, use high purity PFA fluorine plastic lining and high purity alumina industrial ceramic conduit. These measures will help prevent or reduce the occurrence of vortex and gas separation. In other words, improving the sensor manufacturing process, improving the environmental conditions and installation conditions of the instrument, and adopting measures such as installing an exhaust valve upstream of the instrument may avoid problems.
Increasing the instrument damping time can effectively solve the impact of this pulse-type bubble noise, and at the same time it also brings the disadvantage of unresponsiveness, that is, when the actual flow fluctuations, the instrument response is very slow. This is undoubtedly a problem for cooling water systems that require sensitive control. In order to solve this problem, intelligent electromagnetic flowmeters can use software logic to determine the method of coarse error handling [5]. In the event of such a failure, it is determined whether the flow changes by adjusting the insensitivity of the flow rate and the limit of the change in the amplitude. If it is not the noise of the air bubbles rubbing the electrodes, the CPU will perform normal sampling, operation and digital filtering; if it is determined that there is bubble noise, cut the measured values ​​and maintain the previous flow measurement. In this way, the damping time during normal flow measurement is still 3 ~ 6s. Only when there is bubble noise, the insensitivity time will be lengthened according to the length of the pulse width setting, and the system control time will also be lengthened.
Secondly, setting the instrument damping time and function reasonably can also solve the false alarm of bubble noise measurement. The damping time is selected based on the pulse width of the bubble noise in the flow signal. Generally, the damping time should be 3 to 5 times the bubble noise pulse width. If the bubble noise pulse width is 10s, the damping time should take 30 ~ 50s. The specific choice should be based on the required control accuracy, 3 times the pulse width control error in 5%, 5 times the pulse width control accuracy is higher than 1%.
When we reasonably select the "change rate limit value" and "insensitivity time value" of the electromagnetic flow converter with a coarse error suppression function, the converter can not only suppress the false alarm caused by bubble noise, but also the reaction speed of the instrument during normal operation. The set damping time value can still be maintained.
1). Heater: (controlled separately) A. Heater separately Set different temperature according material forming demand to insure product quality. Adjusted the voltage of heater by AC voltage meter which can insures the heater temperature steady and save power. B. Change the heater units fleetly. And it is economical for maintain because it only need change part units.
2). Controlling the heater unit separately can short the heating time and economize energy and improve product quality and reduce cost.
3). Adjustable frame: The side size clamping can be adjusted as the working required.
ABS Thermoforming Machine, Manual Vacuum Forming Machine, Plastic Vacuum Forming Machines
Hangzhou Xiaoshan Wanfeng Mechanical & Electrical Equipment Factory , https://www.wfengmachinery.com