Positive pressure method non-contact liquid filling liquid level control method
A non-contact, liquid control technology, applied in packaging automatic control, liquid materials, packaging, etc., can solve the problem that the filling method cannot efficiently and accurately control the liquid level, so as to improve the effective filling efficiency and prevent splashing. , fast effect
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Embodiment 1
[0059] Such as figure 1 As shown, the positive pressure non-contact liquid filling method of this embodiment includes the following steps:
[0060] S1. Insert a measuring conduit 20 into the container to be filled, and the nozzle is located at a specified height in the container to be filled;
[0061] S2, providing a constant positive pressure to the measuring conduit 20;
[0062] S3. When filling, obtain the pressure change in the measuring conduit 20 caused after the filled liquid material reaches the specified height of the filled container;
[0063] S4. After the pressure change reaches the set value, a signal is sent to stop filling.
[0064] Due to the inevitable errors in the cavity structure of the filled container, especially the glass and ceramic containers, the error is greater, and the traditional filling device can only achieve accurate control of the flow rate, and cannot vary the volume. Containers with high consistency of liquid level can be filled. The exis...
Embodiment 2
[0081] The positive pressure non-contact liquid filling method of this embodiment is further improved on the basis of Embodiment 1, and the positive pressure in step S2 is micro pressure.
[0082] In this embodiment, the measuring conduit 20 is provided with a slight positive pressure of 95-140 Pa higher than the normal pressure in the filling environment, and the pressure provided by the positive pressure device 4 is not easy to be too large or too small, and the excessive pressure will easily affect the sensitivity of the pressure sensor , affecting the accuracy of liquid level control, and excessive positive pressure may cause splashing of liquid materials, and a pressure that is too close to normal pressure will increase the response time of the pressure sensor when the filling liquid level is in place. With the pressure provided by the positive pressure device 4 Infinitely close to normal pressure, the response time is also infinitely close to the response time of the devi...
Embodiment 3
[0085] The positive pressure non-contact liquid filling method of this embodiment is further improved on the basis of Embodiments 1-2, and further includes:
[0086] S5. After the filling is stopped, use the measuring conduit 20 to draw liquid, so that the liquid level of the liquid material in the container to be filled is reduced to a height equal to the mouth of the nozzle.
[0087] Through the method of Example 1, after the filling is completed, the liquid level in each container on the same assembly line can be basically guaranteed to be equal, but there are two factors that may cause height errors: one is when the filling is stopped, the unfinished liquid The material continues to fall, and an error will be generated at this time. Second, the increase in the liquid level in the time between the pressure sensor being triggered after the liquid level of the filling liquid material is in place and the control valve being completely closed will cause an error. When the param...
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