A method and device for controlling filling accuracy

Abstract

The invention provides a method and equipment for controlling filling accuracy. By using a controlling method including a system initiation stage, a rough filling stage, a refined filling stage and aclosing stage, the filling accuracy is controlled; in the refined filling stage, low-speed filling is carried out by using a filling pump; after second predetermined time T16, the weight of liquid isdetected in real time until the weight reaches a second predetermined value G2 and then the detection is stopped; and the size of the second predetermined value G2 is determined according to a difference value between target weight G1 of a container and the weight of a less amount of surplus liquid which does not flow into the container during closing of the filling pump. According to the method and equipment for controlling the filling accuracy disclosed by the invention, rough filling and refined filling are separately carried out and sectional control is carried out, the rough filling is used for ensuring the production speed and the refined filling is used for ensuring the filling accuracy; the pump-rear pipe storage amount is taken into consideration between a refined filling value and a predetermined value; and through calibrating the matching of the refined filling value and the pump-rear pipe storage amount in real time, the situation that the final filling amount is almost consistent with the predetermined value is ensured.

Description

technical field [0001] The invention belongs to the field of filling automatic control, and in particular relates to a weighing type filling precision control method and equipment. Background technique [0002] Aseptic filling technology is a new production process produced in recent years, followed by aseptic cold filling production line, however, there are two main forms of aseptic filling at present, one is to use flowmeter as The filling technology of the measuring device, the other is the filling technology using the load cell as the measuring device. However, the price and cost of the flowmeter is often higher than that of the load cell, and there is a problem of insufficient high temperature resistance, while the load cell is not affected by temperature and air bubbles. [0003] The filling system is the core part of the whole set of packaging equipment, and the filling accuracy is the most important performance index to measure the filling system, but there is still...

AI Technical Summary

Problems solved by technology

However, the price and cost of the flowmeter is often higher than that of the load cell, and there is a problem of insufficient high temperature resistance, while the load cell is not affected by temperature and air bubbles

[0003] The filling system is the core part of the whole set of sub-packaging equipment, and the filling accuracy is the most important performance index to measure the filling system, but there is still the problem that the filling accuracy is not accurate enough when using the load cell for filling control

The traditional filling accuracy control almost depends on the pump itself, that is, given a fixed filling volume, the stroke of the pump is obtained through conversion, and the final filling volume is completely determined by the pump; even a filling system with online weighing can only judge Due to the deviation of this filling volume, the response after automatic calibration needs to take effect at least in the next cycle, and the accuracy control of the current filling cycle cannot be achieved.

Images