A method for controlling liquid level of non-contact liquid filling by negative pressure method

A non-contact liquid control technology, which is applied in the fields of automatic packaging control, liquid materials, packaging, etc., can solve the problem that the filling method cannot be efficient and accurately control the liquid level, and achieve the purpose of overcoming the inconsistent liquid level, fast speed, Responsive fast effect

Active Publication Date: 2022-05-03
安徽沛愉包装科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that the existing filling method cannot efficiently and accurately control the liquid level height, the present invention provides a non-contact liquid filling method for controlling the liquid level by negative pressure method. When the liquid level reaches the height of the nozzle surface of the measuring conduit, it can cause a significant pressure change in the measuring conduit, thereby accelerating the process of the pressure change reaching the set value, and quickly and timely controlling the filling device to stop filling. The filling error is small and the liquid Accurate position control and increased filling efficiency

Method used

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  • A method for controlling liquid level of non-contact liquid filling by negative pressure method
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  • A method for controlling liquid level of non-contact liquid filling by negative pressure method

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Embodiment 1

[0059] Such as figure 1 As shown, the negative 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 negative 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 negative pressure non-contact liquid filling method of this embodiment is further improved on the basis of Embodiment 2, and the negative pressure in step S2 is a slight pressure.

[0082] In this embodiment, the measuring conduit 20 is provided with a slight negative pressure lower than the normal pressure of 95 to 140 Pa in the filling environment, and the negative pressure provided by the negative pressure device 4 is not easy to be too large or too small, and the pressure is easy Affect the sensitivity of the pressure sensor and the accuracy of liquid level control. Excessive negative pressure may quickly draw liquid materials into the vicinity of the pressure sensor and affect subsequent detection. A pressure that is too close to normal pressure will increase the pressure when the filling liquid level is in place. The response time of the sensor, along with the pressure provided by the negative pressure device 4, is infinitely close to normal pressure, and the r...

Embodiment 3

[0085] The negative 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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Abstract

The invention discloses a negative pressure non-contact liquid filling method for controlling liquid level, which belongs to the technical field of filling. It includes the following steps: S1, inserting a measuring conduit in the container to be filled, and the nozzle is located at a specified height in the container to be filled; S2, providing a constant negative pressure to the measuring conduit; S3, obtaining the filling liquid state during filling The pressure change in the measuring conduit caused by the material reaching the specified height of the filled container; S4. After the pressure change reaches the set value, a signal is sent to stop filling; S5. After stopping the filling, use the measuring conduit to pump liquid to make the filled container The liquid level of the internal liquid material drops to the level of the nozzle. The invention introduces a constant negative pressure into the measuring conduit, and when the liquid level reaches the height of the nozzle surface of the measuring conduit during filling, it can cause obvious pressure changes in the measuring conduit, thereby accelerating the process of the pressure change reaching the set value, and quickly Timely control of filling stop, small filling error, accurate liquid level control and increased filling efficiency.

Description

technical field [0001] The invention belongs to the technical field of filling, and more specifically relates to a method for controlling liquid level of non-contact liquid filling by negative pressure method. Background technique [0002] In the hydration production line of the beverage industry, when it comes to the packaging of liquids, most of them use filling valves for filling. The accuracy requirements of the filled liquid level height are getting higher and higher, and many users have put forward requirements for the consistency of the liquid level height after liquid filling, which is a challenge for the traditional filling method. [0003] Among the existing liquid filling methods, most manufacturers use mechanical filling valves to fill liquids. This filling method is popular because of its low cost and convenient processing. However, the filling accuracy of mechanical valves is poor, and the filling The volume is difficult to control, and the valve closing proce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B65B3/30B65B57/00
CPCB65B3/30B65B57/00
Inventor 彭跃猛
Owner 安徽沛愉包装科技有限公司
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