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Introduction to the filling accuracy of peristaltic pump
The summary of peristaltic pump knowledge, Baoding Shenchen factory for you. How to improve the filling accuracy of peristaltic pump?
The so-called filling is the process of transferring a metered liquid within a specified time. Filling accuracy error refers to the amount of filling per measurement after multiple fillings. The formula is: filling accuracy = (maximum - minimum) / average. Therefore, to ensure the consistency of the amount of filling each time, the accuracy of the filling is improved. Since the stepping motor is easy to control the angle and the running speed is not affected by the load, it can be made into a more accurate open-loop control system, so the general filling system is driven by a stepping motor.
The technology currently used in the peristaltic pump filling market is not the same. Now we mainly talk about the characteristics of various technologies:
First: the use of time timer to control the amount of filling, this method is the most easy to achieve, but the error is also large. The main reasons are the influence of temperature and the influence of program structure. The single-chip microcomputer works by the frequency output of the crystal oscillator, and the temperature has an influence on the crystal oscillator frequency. A good crystal oscillator can minimize the influence, but it cannot be eliminated. This influence directly determines the size of the timer time base in the single-chip microcomputer, thus affecting The set time is long, causing the time of each peristaltic pump to work inconsistently, thus causing an error. In addition, it is not advisable to use the program to accurately generate the time value. When working, the influence of various interrupt operations will lead to time error, and this error is unmeasurable and cannot be compensated.
Second: use the number of pulses to control the amount of filling. This method can ensure that the total number of angles that the peristaltic pump operates in each assignment is the same, and the filling accuracy is much higher than the time control method. However, due to the pulsation phenomenon when the peristaltic pump transmits liquid, although the total number of operations can be controlled by the number of pulses, the instantaneous flow rate during the stop is the peak or valley of the pulsation or a certain flow rate in the middle is uncertain, that is, the position of the roller is stopped. The position is inconsistent after one assignment. This will result in a distribution error each time the wheel stops at a different position. This distribution error is relatively small compared to the larger amount of dispensed liquid, mainly because it has a large effect on the distribution of smaller liquid quantities.
Third: the use of angle control technology to control the amount of filling. This method increases the angle control technology during the stoppage based on the number of pulses to control the filling amount, ensuring that the peristaltic pump rollers are in the same position each time the machine is stopped, thus eliminating the influence of the peristaltic pump pulsation on the filling amount. , the injection of tiny flows is significantly improved.
The above three filling technologies are open-loop control, and the flow attenuation factor of the peristaltic pump hose is not considered. In actual work, it should be corrected regularly to achieve higher filling accuracy.
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