Liquid delivery weighing device

Abstract

The application discloses a liquid conveying and weighing device, which comprises a container, a controller, a coarse pipe assembly and a fine pipe assembly; the coarse pipe assembly comprises a main liquid storage tank and a coarse pipe, one end of the coarse pipe is connected with the main liquid storage tank, the other end of the coarse pipe is provided with a coarse pipe liquid outlet located above the container, a coarse conveying pump is arranged on the coarse pipe, and a self-flow section is formed between the coarse conveying pump and the coarse pipe liquid outlet; the fine pipe assembly comprises an auxiliary liquid storage tank and a three-way valve, a dropper, a liquid return pipe and a liquid suction pipe are arranged on the three-way valve, and one end of the dropper is provided with a liquid drop outlet; one end of the liquid return pipe is communicated with the auxiliary liquid storage tank, a fine conveying pump is arranged on the liquid return pipe; one end of the liquid suction pipe is inserted into the self-flow section; and a weight sensor is arranged below the container. The application can realize quick flow interruption of the coarse pipe without dripping while realizing quick large-flow conveying of the coarse pipe, then realizes high-precision and quick liquid quantitative conveying through the liquid drop outlet.

Description

Technical Field

[0001] This invention relates to the field of liquid quantitative conveying technology, and in particular to a liquid conveying and weighing device. Background Technology

[0002] In the process of quantitative liquid transportation, pipelines and pumps are indispensable. In the prior art, to measure the amount of liquid being transported, metering pumps or metering valves are usually used in the pipeline, with a measurement accuracy of about ±0.5%. Moreover, after the pump stops pumping or the metering valve closes, a certain amount of liquid will inevitably be generated at the outlet of the pipeline and the pump body or the metering valve itself (i.e., the gravity flow section in this application) or liquid adhering to the wall, thus affecting the actual amount of liquid transported into the container. In order to achieve rapid transportation of large amounts of liquid, larger pipelines and pumps must be used. The larger the pipeline and pump, the more liquid is in the gravity flow section. Especially when transporting high-viscosity liquids such as resins and curing agents, the gravity flow section or liquid adhering to the wall seriously affects the measurement accuracy and speed.

[0003] Therefore, there is an urgent need to design a liquid conveying and weighing device that can achieve rapid flow interruption without dripping in the thick pipe while conveying a large flow rate quickly using a thick pipe, and then add liquid with high precision through the drip nozzle, thus achieving high-precision and rapid liquid conveying. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the technical solution adopted in this invention is as follows:

[0005] A liquid conveying and weighing device, characterized in that it includes a container, a controller, a thick tube assembly, and a thin tube assembly;

[0006] The coarse pipe assembly includes a main liquid storage tank and a coarse pipe. One end of the coarse pipe is connected to the main liquid storage tank, and the other end is provided with a coarse pipe outlet located above the container and facing downwards. A coarse delivery pump is provided on the coarse pipe between the coarse pipe outlet and the main liquid storage tank. The section between the coarse delivery pump and the coarse pipe outlet is a gravity flow section.

[0007] The thin tube assembly includes a secondary storage tank and a three-way valve. The three-way valve is equipped with a dropper, a return pipe, and a suction pipe. The end of the dropper away from the three-way valve has a drip port located above the container. The end of the return pipe away from the three-way valve is connected to the secondary storage tank, and a thin delivery pump is installed on the return pipe. The diameter of the suction pipe is smaller than that of the thick pipe, and the end of the suction pipe away from the three-way valve is inserted into the gravity flow section.

[0008] The three-way valve is a two-position three-way valve. When it is in the first position, the dropper and the return pipe are connected; when it is in the second position, the return pipe and the suction pipe are connected.

[0009] The fine delivery pump is a bidirectional pump;

[0010] A weight sensor is installed at the bottom of the container;

[0011] The three-way valve, weight sensor, fine delivery pump, and coarse delivery pump are all electrically connected to the controller.

[0012] Preferably, both the suction tube and the thick tube are cylindrical structures, with the suction tube located near the bottom of the inner side of the thick tube and covering the outlet of the thick tube along its length.

[0013] Preferably, the outlet of the coarse tube is a circular or elliptical structure, with the center of the circle or ellipse located at the bottom of the coarse tube.

[0014] Preferably, the side wall of the liquid extraction tube is provided with a plurality of liquid extraction holes, and the liquid extraction tube is provided with a liquid extraction hole at the bottom near the liquid outlet of the thick tube.

[0015] Preferably, the gap between the bottom of the outer wall of the suction tube and the bottom of the inner wall of the thick tube is ≤1mm, and the suction hole is located at the bottom of the suction tube.

[0016] Preferably, the distance between adjacent suction holes above the liquid outlet of the coarse tube is ≤3mm.

[0017] Preferably, a weight calibration component is disposed above the container near the weight sensor. The weight calibration component includes a weight and a weight picker / placer, which places the weight on or away from the container.

[0018] Preferably, the outer wall of the extraction tube and the inner wall of the gravity flow section of the thick tube are provided with a Teflon coating.

[0019] Preferably, the diameter of the dripping orifice is smaller than the diameter of the dropper, and the diameter of the dripping orifice is ≤2mm.

[0020] Preferably, the fine delivery pump is a gear pump, and the auxiliary storage tank is located above the fine delivery pump in the direction of gravity.

[0021] Preferably, the container is equipped with a stirrer.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. While using a large-volume tube for rapid and high-flow delivery, the flow can be quickly interrupted without dripping through the liquid extraction tube. Then, high-precision quantitative addition of liquid can be achieved through the drip port, thus realizing rapid and high-precision quantitative liquid delivery.

[0024] 2. The flow is interrupted by drawing liquid through a suction tube, avoiding continuous liquid dripping. It is applicable to liquids of various viscosities and has good versatility.

[0025] 3. It can achieve the goal of eliminating residual liquid in open pipelines such as self-flowing sections and drip irrigation systems, reducing the environmental impact of air- and humidity-sensitive liquids such as two-component adhesives (resin and curing agent), and improving the stability of the liquid. Attached Figure Description

[0026] Figure 1 This is a cross-sectional view of the overall structure of the present invention;

[0027] Figure 2 for Figure 1 A magnified view of part A;

[0028] Figure 3 This is a schematic diagram of the liquid outlet of the thick tube;

[0029] Figure 4 This is a cross-sectional view of the thick pipe and the suction pipe at the bottom of the liquid outlet of the thick pipe.

[0030] The components include: container 10, weight sensor 11, stirrer 12, coarse pipe assembly 20, coarse delivery pump 21, coarse pipe 22, gravity flow section 221, coarse pipe outlet 222, main storage tank 23, fine pipe assembly 30, fine delivery pump 31, three-way valve 32, dropper 33, return pipe 34, suction pipe 35, suction hole 351, auxiliary storage tank 36, weight calibration assembly 40, weight 41, and weight take-up and put-down device 42. Detailed Implementation

[0031] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0032] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," "up," "down," and similar expressions used in this document are for illustrative purposes only.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] The present invention will now be further described with reference to the accompanying drawings and specific embodiments:

[0035] like Figures 1-4 As shown, a liquid conveying and weighing device includes a container 10, a controller, and two conveying pipes, each of which includes a thick pipe assembly 20 and a thin pipe assembly 30.

[0036] The coarse pipe assembly 20 includes a main liquid storage tank 23 and a coarse pipe 22. One end of the coarse pipe 22 is connected to the main liquid storage tank 23, and the other end is provided with a coarse pipe outlet 222 located above the container 10 and facing downwards. A coarse delivery pump 21 is provided on the coarse pipe 22 between the coarse pipe outlet 222 and the main liquid storage tank 23. The coarse delivery pump 21 and the coarse pipe outlet 222 are a gravity flow section 221.

[0037] The thin tube assembly 30 includes a secondary storage tank 36 and a three-way valve 32. The three-way valve 32 is respectively equipped with a dropper 33, a return pipe 34, and a suction pipe 35. The end of the dropper 33 away from the three-way valve 32 is provided with a drip port located above the container 10. The end of the return pipe 34 away from the three-way valve 32 is connected to the secondary storage tank 36, and a thin delivery pump 31 is provided on the return pipe 34. The diameter of the suction pipe 35 is smaller than that of the thick pipe 22, and the end of the suction pipe 35 away from the three-way valve 32 is inserted into the interior of the gravity flow section 221. The thin delivery pump 31 is a bidirectional pump.

[0038] A weight sensor 11 is provided at the bottom of the container 10;

[0039] The three-way valve 32 is a two-position three-way valve. When it is in the first position, the dropper 33 and the return pipe 34 are connected; when it is in the second position, the return pipe 34 and the suction pipe 35 are connected.

[0040] The three-way valve 32, weight sensor 11, fine delivery pump 31 and coarse delivery pump 21 are respectively connected to the controller via electrical signals.

[0041] In this embodiment, the controller is set to add 20,000 grams of resin and 5,000 grams of curing agent (resin:curing agent = 4:1) to container 10. The steps are as follows:

[0042] 1. Start the coarse delivery pump 21, pump 17,000 grams of resin at full speed, then reduce the speed to 50% and continue pumping to approximately 19,000 grams, then reduce the speed to 10% and continue pumping to approximately 19,500 grams, then reduce the speed to 5%.

[0043] Pump the solution to approximately 19,980 grams, then turn off the coarse delivery pump 21.

[0044] 2. Set the three-way valve 32 to the second position, start the fine transfer pump 31 and reverse it to pump the resin in the gravity flow section 221 to the auxiliary storage tank 36 through the liquid extraction pipe 35 and the liquid return pipe 34; at the same time, the weight sensor 11 accurately measures the weight of the resin in the container.

[0045] 3. Set the three-way valve 32 to the first position, start the fine delivery pump 31 and rotate it at full speed in the forward direction, and add the resin weight to about 19998 grams through the dropper 33;

[0046] 4. The fine delivery pump 31 rotates at low speed in the forward direction, allowing the resin to be added drop by drop to 20000 + / - 0.1 grams;

[0047] 5. Referring to steps 1-4, add 5000+ / 0.1g of hardener to container 10;

[0048] 6. Complete the quantitative addition of resin and curing agent, and transfer to the next process.

[0049] 7. Weight sensor 11 measures the weight of container 10, and after tare, resin and curing agent are added in a measured amount. Depending on the production schedule, if the downtime is long, the liquid can be pumped to auxiliary storage tank 36 via dropper 33.

[0050] 8. If the amount of curing agent added is excessive, the corresponding fine delivery pump 31 for resin can be turned on to add more resin to keep the ratio of the two constant.

[0051] Furthermore, to reduce the impact of liquid on the high-precision weight sensor 11 during pumping, which could affect the sensor's accuracy, an isolation device is used to separate the weight sensor 11 from the container 10 during rapid liquid pumping. When accurate weight of the container 10 and its internal liquid is required, the isolation device is removed, allowing the weight sensor 11 to contact the container 10 for weighing.

[0052] Furthermore, to avoid frequent intervention of the weight sensor 11 in weighing, the coarse delivery pump 21 is a metering pump.

[0053] Furthermore, in order to quickly and fully pump the liquid from the gravity flow section 221 to the auxiliary storage tank 36 and avoid residual liquid adhering to the walls and flowing away, such as... Figure 2 , 4 As shown, both the suction tube 35 and the thick tube 22 are cylindrical structures. The suction tube 35 is close to the bottom of the inner side of the thick tube 22, and the suction tube 35 covers the outlet 222 of the thick tube in the length direction.

[0054] Furthermore, the outlet 222 of the coarse tube is a circular or elliptical structure, with the center of the circle or ellipse located at the bottom of the coarse tube 22.

[0055] In this embodiment, as Figure 3As shown, both the thick tube 22 and the thick tube outlet 222 are circular. The thick tube outlet 222 forms a smooth arc extending from bottom to top on the thick tube 22, so that the liquid can flow along the edge of the arc to the bottom of the thick tube outlet 222, so that the suction tube 35 can draw it in and avoid disorderly dripping.

[0056] Furthermore, in order to quickly and accurately draw out the liquid concentrated at the outlet 222 of the coarse tube and avoid dripping, such as Figure 2 , 4 As shown, a plurality of extraction holes 351 are provided on the side wall of the extraction tube 35, and at least the extraction tube 35 is provided with extraction holes 351 near the bottom of the outlet 222 of the thick tube.

[0057] Furthermore, to ensure the suction effect of the suction hole 351, and to ensure that the unavoidable small amount of residual liquid is stably adsorbed on the tube wall between the suction tube 35 and the coarse tube 22 under the action of molecular tension, thus avoiding flow, such as Figure 4 As shown, the gap between the bottom of the outer wall of the suction tube 35 and the bottom of the inner wall of the thick tube 22 is ≤1mm, and the suction hole 351 is located at the bottom of the suction tube 35.

[0058] Furthermore, since the suction pipe 35 above the outlet 222 of the coarse pipe is suspended, in order to avoid the formation of droplets on the suspended suction pipe 35, the distance between adjacent suction holes 351 above the outlet 222 of the coarse pipe is ≤3mm.

[0059] Furthermore, in order to ensure the accuracy of the weight sensor 11, the weight sensor 11 is periodically calibrated with weights. A weight calibration component 40 is provided above the weight sensor 11 in the container 10. The weight calibration component 40 includes a weight 41 and a weight picker 42. The weight picker 42 places the weight 41 on or away from the container 10.

[0060] Furthermore, in order to reduce liquid adhesion to the walls, the outer wall of the liquid extraction pipe 35 and the inner wall of the gravity flow section 221 of the thick pipe 22 are provided with a Teflon coating.

[0061] Furthermore, in order to more precisely control the droplet weight and reduce droplet suspension, the diameter of the droplet orifice is smaller than the diameter of the dropper 33, and the diameter of the droplet orifice is ≤2mm.

[0062] Furthermore, the fine delivery pump 31 is a gear pump, and the auxiliary storage tank 36 is located above the fine delivery pump 31 in the direction of gravity. A certain amount of liquid is maintained in the auxiliary storage tank 36 for dripping; a liquid level sensor is installed in the auxiliary storage tank 36.

[0063] In this embodiment, the fine delivery pump 31 is a gear pump, which has good precision and can withstand large back pressure.

[0064] Furthermore, a stirrer 12 is provided inside the container 10.

[0065] For those skilled in the art, various other corresponding changes and modifications can be made based on the technical solutions and concepts described above, and all such changes and modifications should fall within the protection scope of the claims of this invention.

Claims

1. A liquid conveying and weighing device, characterized in that: Includes a container (10), a controller, a thick tube assembly (20), and a thin tube assembly (30); The coarse pipe assembly (20) includes a main storage tank (23) and a coarse pipe (22). One end of the coarse pipe (22) is connected to the main storage tank (23), and the other end is provided with a coarse pipe outlet (222) located above the container (10) with the opening facing downward. A coarse delivery pump (21) is provided on the coarse pipe (22) between the coarse pipe outlet (222) and the main storage tank (23). The coarse delivery pump (21) and the coarse pipe outlet (222) form a gravity flow section (221). The thin tube assembly (30) includes a secondary storage tank (36) and a three-way valve (32). The three-way valve (32) is equipped with a dropper (33), a return pipe (34), and a suction pipe (35). The dropper (33) has a drip port located above the container (10) at the end away from the three-way valve (32). The return pipe (34) is connected to the secondary storage tank (36) at the end away from the three-way valve (32), and a thin transfer pump (31) is installed on the return pipe (34). The suction pipe (35) has a smaller diameter than the thick pipe (22), and the end of the suction pipe (35) away from the three-way valve (32) is inserted into the interior of the gravity flow section (221). The three-way valve (32) is a two-position three-way valve. When it is in the first position, the dropper (33) and the return pipe (34) are connected; when it is in the second position, the return pipe (34) and the suction pipe (35) are connected. The fine delivery pump (31) is a bidirectional pump; A weight sensor (11) is provided below the container (10); The three-way valve (32), weight sensor (11), fine delivery pump (31) and coarse delivery pump (21) are respectively connected to the controller via electrical signals.

2. The liquid conveying and weighing device as described in claim 1, characterized in that: Both the extraction tube (35) and the thick tube (22) are cylindrical structures. The extraction tube (35) is located near the bottom of the inner side of the thick tube (22), and the extraction tube (35) covers the outlet (222) of the thick tube in the length direction.

3. The liquid conveying and weighing device as described in claim 1, characterized in that: The outlet (222) of the coarse tube is a circular or elliptical structure, with the center of the circle or ellipse located at the bottom of the coarse tube (22).

4. The liquid conveying and weighing device as described in claim 1, characterized in that: The side wall of the liquid extraction tube (35) is provided with a plurality of liquid extraction holes (351), and the liquid extraction tube (35) is provided with a liquid extraction hole (351) near the bottom of the liquid outlet (222) of the thick tube.

5. The liquid conveying and weighing device as described in claim 1, characterized in that: The gap between the bottom of the outer wall of the liquid extraction tube (35) and the bottom of the inner wall of the thick tube (22) is ≤1mm, and the liquid extraction hole (351) is located at the bottom of the liquid extraction tube (35).

6. The liquid conveying and weighing device as described in claim 4, characterized in that: The distance between adjacent extraction holes (351) above the liquid outlet (222) of the thick tube is ≤3mm.

7. The liquid conveying and weighing device as described in claim 1, characterized in that: A weight calibration component (40) is provided above the container (10) near the weight sensor (11). The weight calibration component (40) includes a weight (41) and a weight picker (42), which allows the weight (41) to be placed on or away from the container (10).

8. The liquid conveying and weighing device as described in claim 1, characterized in that: The outer wall of the extraction tube (35) and the inner wall of the gravity flow section (221) of the thick tube (22) are provided with Teflon coating.

9. The liquid conveying and weighing device as described in claim 1, characterized in that: The diameter of the dripping port is smaller than the diameter of the dropper (33), and the diameter of the dripping port is ≤2mm.

10. The liquid conveying and weighing device as described in claim 1, characterized in that: The fine delivery pump (31) is a gear pump, and the auxiliary storage tank (36) is located above the fine delivery pump (31) in the direction of gravity; a stirrer (12) is provided inside the container (10).

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