High-precision liquid material filling device

Abstract

The utility model relates to a high-precision liquid material filling device which comprises a peristaltic pump, a feeding pipeline, a main conveying pipeline, a filling pipeline and a backflow pipeline. Before formal filling, the backflow control valve can be firstly opened and the filling control valve can be closed, and then the peristaltic pump drives the liquid material to pass through the feeding pipeline, the main conveying pipeline and the backflow pipeline for backflow calibration. The mass flow meter can obtain the actual weight of the backflow liquid material, and the density of the liquid material can be calibrated again by comparing and analyzing the actual weight and the expected backflow weight, so that the deviation between the actual weight and the expected weight caused by the fluctuation of the density of the liquid material is eliminated. During formal filling, the backflow control valve is closed, the filling control valve is opened, and the peristaltic pump operates at a required angle according to the set filling weight and the calibrated liquid material density, so that the actual weight of the filled liquid material tends to be consistent with the set filling weight. Therefore, the high-precision liquid material filling device can effectively avoid deviation of the filling amount.

Description

Technical Field

[0001] The utility model relates to the technical field of fine chemical industry, in particular to a high-precision liquid material filling device. Background Art

[0002] High-precision filling devices are suitable for printing, food and medicine, electronic packaging, and new energy fields. They can achieve high-precision filling of small-volume liquid materials such as ink, silicone, juice, lithium battery slurry, and hydrogen fuel cell slurry. High-precision filling devices generally control the output volume of liquid materials by controlling the number of rotations of the peristaltic pump, thereby achieving quantitative filling.

[0003] Traditional filling devices require manual weighing to calculate the density of liquid materials, and require multiple calibrations to set compensation parameters. However, the density of liquid materials may fluctuate slightly during the manual calibration cycle due to changes in environmental factors; and the hose of the peristaltic pump will also age as the use time increases. The elasticity change of the hose can also cause the volume of the peristaltic pump to change per rotation. Therefore, the filling amount of traditional filling devices is prone to deviation during continuous use. Utility Model Content

[0004] Based on this, it is necessary to provide a high-precision liquid material filling device that can effectively avoid deviations in the filling amount in order to address the above problems.

[0005] A high-precision liquid filling device, comprising:

[0006] A peristaltic pump, comprising a pump body and a pumping tube detachably mounted on the pump body;

[0007] A feed pipeline, connected to the feed port of the pumping pipe;

[0008] A main delivery pipeline is connected to the discharge port of the pumping pipe, and a mass flow meter is provided on the main delivery pipeline, and the mass flow meter can obtain weight information of the liquid material flowing through the main delivery pipeline;

[0009] A filling pipeline and a return pipeline are connected to one end of the main delivery pipeline away from the peristaltic pump, wherein the filling pipeline is provided with a filling control valve, and the return pipeline is provided with a return control valve.

[0010] In one of the embodiments, a suction sink is provided at the end of the feed pipeline away from the peristaltic pump.

[0011] In one of the embodiments, a pressure sensor is provided on the main delivery pipeline.

[0012] In one of the embodiments, the outlet end of the mass flow meter is connected to a hard tube, the end of the hard tube away from the mass flow meter is connected to a three-way connector, and the filling pipeline and the return pipeline are connected to the three-way connector.

[0013] In one of the embodiments, a reflux countersunk head is provided at the end of the reflux pipeline away from the main delivery pipeline.

[0014] In one of the embodiments, a filling needle is provided at the end of the filling pipeline away from the main delivery pipeline.

[0015] In one of the embodiments, the filling needle is mounted on an adjustable support, and the adjustable support is capable of adjusting the height of the filling needle.

[0016] In one of the embodiments, a workbench is further included, and the peristaltic pump and the mass flow meter are both installed on the workbench.

[0017] In one of the embodiments, a host computer system is further included, and the host computer system can set the operating angle of the peristaltic pump, and the mass flow meter can feed back the obtained weight information to the host computer system.

[0018] In one of the embodiments, the host computer system is capable of recording the operating time of the peristaltic pump and generating a warning message when the operating time exceeds a threshold.

[0019] The above-mentioned high-precision liquid filling device can open the reflux control valve and close the filling control valve before the formal filling, and then the peristaltic pump drives the liquid to reflux through the feed pipeline, the main delivery pipeline and the reflux pipeline for calibration. The mass flow meter can obtain the actual weight of the refluxed liquid. By comparing and analyzing the actual weight with the expected reflux weight, the density of the liquid can be recalibrated to eliminate the deviation between the actual weight and the expected weight caused by the fluctuation of the liquid density. During the formal filling, close the reflux control valve and open the filling control valve. The peristaltic pump will operate at the required angle according to the set filling weight and the calibrated liquid density, so that the actual weight of the added liquid can be consistent with the set filling weight. It can be seen that the above-mentioned high-precision liquid filling device can effectively avoid deviations in the filling amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1It is a schematic structural diagram of a high-precision liquid material filling device in a preferred embodiment of the utility model. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0028] See also Figure 1 The high-precision liquid material filling device 100 in the preferred embodiment of the utility model includes a peristaltic pump 110, a feed pipeline 120, a main conveying pipeline 130, a filling pipeline 140 and a return pipeline 150.

[0029] The peristaltic pump 110 includes a pump body 111 and a pumping tube 112, and the pumping tube 112 is detachably mounted on the pump body 111. The pump body 111 is generally composed of a driver and a pump head, and the driver can drive the pump head to rotate so as to squeeze the pumping tube 112. Each squeezing of the pumping tube can drive the liquid in the pumping tube 112 to feed forward a certain distance, thereby achieving liquid pumping.

[0030] The feed line 120 is connected to the feed port of the pumping tube 112, and can absorb the liquid stored in the solution barrel 200 under the action of the peristaltic pump 110. The feed line 120 can be a hose, so that it is convenient to extend into the solution barrel 200. Specifically in this embodiment, a suction sink 121 is provided at the end of the feed line 120 away from the peristaltic pump 110. The suction sink 121 can be formed of metal and has a high density, so it can sink to the bottom of the solution barrel 200, so that the feed line 120 can absorb the liquid in the solution barrel 200.

[0031] The main delivery pipeline 130 is connected to the discharge port of the pumping pipe 112, and a mass flow meter 131 is provided on the main delivery pipeline 130. The mass flow meter 131 can obtain the weight information of the liquid material flowing through the main delivery pipeline 130. Specifically in this embodiment, a pressure sensor 132 is provided on the main delivery pipeline 130. The pressure sensor 132 can monitor the pressure of the liquid material flowing through the main delivery pipeline 130 in real time.

[0032] In this embodiment, the liquid material high-precision filling device 100 further includes a workbench 160, and the peristaltic pump 110 and the mass flow meter 131 are both installed on the workbench 160. Specifically, a fixed bracket 161 is provided on the workbench 160, and the mass flow meter 131 is installed on the fixed bracket 161. With the support of the workbench 160, the stability of the peristaltic pump 110 and the mass flow meter 131 is improved, which helps to improve the accuracy of the liquid material high-precision filling device 100.

[0033] The filling pipeline 140 and the return pipeline 150 are connected to one end of the main delivery pipeline 130 away from the peristaltic pump 110. Specifically, in the present embodiment, the outlet end of the mass flow meter 131 is connected to the hard tube 133, and one end of the hard tube 133 away from the mass flow meter 131 is connected to the three-way connector 134, and the filling pipeline 140 and the return pipeline 150 are connected to the three-way connector 134. The three outlets of the three-way connector 134 are respectively connected to the hard tube 133, the filling pipeline 140 and the return pipeline 150. Moreover, the hard tube 133 is not easily deformed, so that it is more convenient to connect the filling pipeline 140 and the return pipeline 150 to the main delivery pipeline 130.

[0034] Furthermore, a filling control valve 141 is provided on the filling pipeline 140, and a reflux control valve 151 is provided on the reflux pipeline 150. The filling control valve 141 and the reflux control valve 151 can be opened or closed separately. When the filling control valve 141 is opened, the filling pipeline 140 is opened; when the reflux control valve 151 is opened, the reflux pipeline 150 is opened. The filling pipeline 140 is used to add liquid material to the material point, and the end of the reflux pipeline 150 can be extended into the solution barrel 200 to realize the reflux of liquid material.

[0035] When it is necessary to add liquid material to the material point, the filling control valve 141 is opened and the reflux control valve 151 is closed, thereby opening the filling pipeline 140 and closing the reflux pipeline 150. At this time, the peristaltic pump 110 is started, and the liquid material can be driven to be added to the material point through the main conveying pipeline 130 and the filling pipeline 140. In this embodiment, a filling needle 142 is provided at the end of the filling pipeline 140 away from the main conveying pipeline 130. The filling needle 142 is not easily deformed, which facilitates the filling of liquid material to the material point.

[0036] In addition, in this embodiment, the filling needle 142 is installed on an adjustable support 160, and the adjustable support 160 can adjust the height of the filling needle 142. The adjustable support 162 is set on the workbench 160, and by adjusting the height of the filling needle 142, the filling needle 142 can be better approached to the material point.

[0037] When the liquid material is refluxed, the filling control valve 141 is closed and the reflux control valve 151 is opened, thereby closing the filling pipeline 140 and opening the reflux pipeline 150. At this time, the peristaltic pump 110 is started, and the liquid material can be driven to reflux into the solution barrel 200 through the main conveying pipeline 130 and the filling and reflux pipeline 150.

[0038] Specifically in this embodiment, a reflux countersunk head 152 is provided at the end of the reflux pipeline 150 away from the main delivery pipeline 130. The reflux countersunk head 152 can also be formed of metal, and has a relatively high density, so it can sink to the bottom of the solution barrel 200, thereby facilitating the liquid material to flow back into the solution barrel 200 through the reflux pipeline 150, and preventing the reflux pipeline 150 from popping out of the solution barrel 200.

[0039] Before the first use, both the filling control valve 141 and the reflux control valve 151 need to be opened, thereby opening the filling pipeline 140 and the reflux pipeline 150. Then, the peristaltic pump 110 is started to drive the liquid material into the filling pipeline 140 and the reflux pipeline 150 through the main delivery pipeline 130, until the liquid material fills the filling pipeline 140 and the reflux pipeline 150. In this way, the air in the pipelines of the high-precision liquid filling device 100 can be discharged before the formal filling, so as to ensure the accuracy of subsequent filling.

[0040] The pumping tube 112 is generally a hose made of materials such as silicone, which will wear out after long-term extrusion, so it needs to be replaced in time to ensure the pumping accuracy of the peristaltic pump 110. After replacing the new pumping tube 112, it is generally not immediately filled, and reflux running-in is required to make the liquid material high-precision filling device 100 reach a stable state as a whole. The reflux running-in process is as follows:

[0041] First, close the filling control valve 141 and open the reflux control valve 151; the peristaltic pump 110 runs at a preset angle to drive the liquid material to reflux through the main delivery pipeline 130 and the reflux pipeline 150. The preset angle can be determined according to the set reflux weight, the diameter of the pumping pipe 112, the preset liquid material density and other parameters; then, compare the actual weight obtained by the mass flow meter 131 with the above-set reflux weight. If the deviation between the two is within the allowable error range, it means that the high-precision liquid material filling device 100 has reached a stable state as a whole. Otherwise, repeat the above-mentioned reflux running-in process until the high-precision liquid material filling device 100 reaches a stable state. If the high-precision liquid material filling device 100 still does not reach a stable state after the set number of reflux running-in, it means that there is an abnormality in the high-precision liquid material filling device 100, so it will stop and alarm.

[0042] Furthermore, the density of the liquid material may fluctuate slightly during the filling process due to changes in environmental factors. If the operating angle of the peristaltic pump 110 is still calculated according to the pre-set liquid material density, the actual weight of the final filling will deviate from the set filling weight, thereby affecting the filling accuracy. Therefore, in order to ensure the filling accuracy, the high-precision liquid material filling device 100 can also perform reflux calibration on the liquid material density. The reflux calibration process is roughly as follows:

[0043] First, open the reflux control valve 151 and close the filling control valve 141; then set the operating angle of the peristaltic pump 110 according to the set reflux weight, liquid density, and the diameter of the pumping tube 112. The peristaltic pump 110 drives the liquid to reflux through the feed pipeline 120, the main delivery pipeline 130, and the reflux pipeline 150, and stops after reaching the set transfer angle; then, compare the actual weight obtained by the mass flow meter 131 with the above-set reflux weight. If the deviation between the two is within the allowable error range, the density fluctuation of the liquid is within an acceptable range; if the deviation between the two exceeds the allowable error range, it is necessary to recalibrate the liquid density according to the actual weight obtained by the mass flow meter 131, and set the calibrated density as the new liquid density. In the subsequent filling process, the required operating angle of the peristaltic pump 110 is calculated based on the set filling weight and the calibrated liquid density. In this way, the actual weight of the added liquid can be made consistent with the set added weight, effectively avoiding deviation in the added amount.

[0044] The above reflux calibration procedure can be performed each time a new liquid material is replaced, or it can be performed after the same liquid material has been formally filled for a long time.

[0045] In addition, in this embodiment, the high-precision liquid material filling device 100 also includes a host computer system 170 , which can control the operating angle of the peristaltic pump 110 , and the mass flow meter 131 can feed back the obtained weight information to the host computer system 170 .

[0046] The host computer system 170 generally also includes a touch screen or physical buttons for human-computer interaction, so that the operator can input parameters such as the set filling volume, liquid material density, and the diameter of the pumping tube 112, and can also input control commands such as start and stop. After the operator inputs the corresponding parameters and starts, the liquid material high-precision filling device 100 can automatically perform the above-mentioned reflux running-in and reflux calibration processes under the control of the host computer system 170.

[0047] Furthermore, in this embodiment, the host computer system 170 can record the operating time of the peristaltic pump 110 and generate an early warning message when the operating time exceeds a threshold. The threshold is determined according to the aging time of the pumping tube 112. It can be seen that the host computer system 170 can monitor the pumping tube 112 in real time, thereby timely reminding to replace the pumping tube 112 to avoid deviations in the filling amount caused by aging of the pumping tube 112.

[0048] The above-mentioned high-precision liquid material filling device 100 can first open the reflux control valve 151 and close the filling control valve 141 before formal filling, and then the peristaltic pump 110 drives the liquid material through the feed pipeline 120, the main conveying pipeline 130 and the reflux pipeline 150 for reflux calibration. The mass flow meter 131 can obtain the actual weight of the refluxed liquid material. By comparing and analyzing the actual weight with the expected reflux weight, the density of the liquid material can be recalibrated to eliminate the deviation between the actual weight and the expected weight caused by the fluctuation of the liquid material density. During formal filling, the reflux control valve 151 is closed and the filling control valve 141 is opened. The peristaltic pump 110 operates at the required angle according to the set filling weight and the calibrated liquid material density, so that the actual weight of the filled liquid material can be consistent with the set filling weight. It can be seen that the above-mentioned high-precision liquid material filling device 100 can effectively avoid deviations in the filling amount.

[0049] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A high-precision liquid filling device, characterized in that: include: A peristaltic pump, comprising a pump body and a pumping tube detachably mounted on the pump body; A feed pipeline, connected to the feed port of the pumping pipe; A main delivery pipeline is connected to the discharge port of the pumping pipe, and a mass flow meter is provided on the main delivery pipeline, and the mass flow meter can obtain weight information of the liquid material flowing through the main delivery pipeline; A filling pipeline and a return pipeline are connected to one end of the main delivery pipeline away from the peristaltic pump, wherein the filling pipeline is provided with a filling control valve, and the return pipeline is provided with a return control valve.

2. The high-precision liquid material filling device according to claim 1 is characterized in that: The end of the feed pipeline away from the peristaltic pump is provided with a suction sink.

3. The high-precision liquid material filling device according to claim 1, characterized in that: A pressure sensor is arranged on the main delivery pipeline.

4. The high-precision liquid material filling device according to claim 1, characterized in that: The outlet end of the mass flow meter is connected to a hard pipe, one end of the hard pipe away from the mass flow meter is connected to a three-way connector, and the filling pipeline and the return pipeline are connected to the three-way connector.

5. The high-precision liquid material filling device according to claim 1, characterized in that: A reflux countersunk head is arranged at the end of the reflux pipeline away from the main delivery pipeline.

6. The high-precision liquid material filling device according to claim 1, characterized in that: A filling needle is arranged at the end of the filling pipeline away from the main delivery pipeline.

7. The high-precision liquid material filling device according to claim 6, characterized in that: The filling needle is mounted on an adjustable support, and the adjustable support can adjust the height of the filling needle.

8. The high-precision liquid material filling device according to claim 1, characterized in that: It also includes a workbench, on which the peristaltic pump and the mass flow meter are both installed.

9. The high-precision liquid material filling device according to claim 1, characterized in that: It also includes a host computer system, which can set the operating angle of the peristaltic pump, and the mass flow meter can feed back the obtained weight information to the host computer system.

10. The high-precision liquid material filling device according to claim 9, characterized in that: The host computer system can record the operating time of the peristaltic pump and generate warning information when the operating time exceeds a threshold.

Images