A modular liquid metering system

Abstract

A modular liquid metering system relates to the technical field of liquid material metering, and comprises a mounting base plate, wherein the mounting base plate is a vertically arranged L-shaped plate, and a weight metering module, a volume metering module and a flow metering module are respectively arranged on the mounting base plate. The present invention solves the problems existing in the liquid metering system in the conventional technology during use, such as the inability to realize adaptive switching of different metering functions, low quantitative batching accuracy, inconvenient determination of various parameters and low liquid recycling utilization rate.

Description

Technical Field

[0001] The invention relates to the technical field of liquid material metering, and in particular to a modular liquid metering system. Background Art

[0002] With the continuous development of industrial automation and intelligence, liquid metering systems, as key production equipment, are gradually becoming an important force in promoting efficient and precise operation of the manufacturing industry.

[0003] Liquid metering system is a device used to accurately measure and control liquid flow, and is widely used in food, chemical, pharmaceutical, petroleum and other industries. The system uses high-precision sensors and advanced control algorithms to measure liquid-related properties and monitor and accurately measure liquid flow in real time. At the same time, the liquid metering system also has functions such as automatic control, data recording and transmission, which can meet the high-precision and high-efficiency requirements of different industries for liquid metering.

[0004] The liquid metering system is mainly composed of a liquid storage tank, a delivery pump, pipelines and a metering bucket. By making targeted adjustments to the metering system, the delivery and metering of acidic, alkaline and high-viscosity liquids can be achieved.

[0005] However, due to functional limitations, existing liquid metering systems often encounter a series of problems during application, including:

[0006] 1. Low metering accuracy makes it difficult to achieve quantitative batching. Specifically, since the metering liquid itself has viscosity and the inner wall of the pipeline is not completely smooth, part of the liquid will adhere to the inner wall of the pipeline during long-distance transportation in the pipeline, causing problems such as reduced flow rate and reduced flow. If these loss equivalents cannot be compensated during the process of liquid quantitative batching, it will directly affect the metering accuracy.

[0007] 2. The metering system has a single function, and it is inconvenient to measure various parameters. Specifically, the measurement of liquid also includes the measurement of various properties such as liquid mass, density, instantaneous flow rate, viscosity coefficient, etc. Different parameters need to be measured using different functional modules; further, due to the difference between the parameter measurement process and the above-mentioned quantitative batching process, as well as the single function of the existing metering system, the same metering system cannot simultaneously realize the two functions of quantitative batching and parameter measurement, and the adaptive switching of different functions during use.

[0008] 3. Low liquid recycling rate. Specifically, after the liquid metering is completed, the liquid needs to be classified and disposed of according to the specific metering process. For example, the liquid that has completed quantitative separation will directly enter the next link to participate in the batching after being discharged, while the liquid that has only been measured for parameters has not changed in its physical and chemical properties. In order to avoid waste, it needs to re-enter the pipeline system for recycling.

[0009] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the invention

[0010] In view of the defects in the prior art, the present invention provides a modular liquid metering system to solve the problems of the liquid metering system in the traditional technology during use, such as the inability to achieve adaptive switching of different metering functions, low quantitative ingredient accuracy, inconvenient measurement of various parameters and low liquid recycling rate.

[0011] To achieve the above object, the present invention provides the following technical solutions:

[0012] A modular liquid metering system comprises a mounting base plate, wherein the mounting base plate is a vertically arranged L-shaped plate, and a weight metering module, a volume metering module and a flow metering module are respectively arranged on the mounting base plate.

[0013] As an optimized solution, a support base is fixedly connected to one side of the upper surface of the mounting substrate, and the support base is a horizontally arranged square seat. The weight measuring module includes a weighing bucket, and the weighing bucket is a conical bucket with upper and lower openings. The weighing bucket is arranged directly above the support base.

[0014] As an optimized solution, four centrosymmetrical weighing brackets are fixedly connected to the upper surface of the support base, and coil springs and weighing sensors are respectively arranged in the weighing brackets.

[0015] As an optimized solution, a square enclosure is provided on the outer side of the weighing bucket, the inner circle of the square enclosure is fixedly connected to the conical outer peripheral wall of the weighing bucket, and the upper end of each weighing bracket is respectively fixedly connected to the lower surface of the square enclosure.

[0016] As an optimized solution, a removable port cover is provided in the upper opening of the weighing bucket, a circular connecting port is opened at the center of the upper surface of the port cover, the lower end opening of the weighing bucket is externally connected to a corrugated connecting pipe, and the lower end of the corrugated connecting pipe is fixed at the center of the upper surface of the supporting base.

[0017] As an optimized solution, a drainage elbow is provided in the support base, the upper port of the drainage elbow passes through the inner top surface of the support base and is butt-connected to the corrugated connecting pipe, and the side port of the drainage elbow passes through the longitudinal end surface of the support base and extends to its outside.

[0018] As an optimized solution, a drainage check valve is provided at the lower end of the weighing bucket.

[0019] As an optimized solution, a square horizontal support plate is fixedly connected to the longitudinal inner wall of the mounting base plate, and a transversely symmetrical water supply pump and a return water pump are respectively fixedly connected to both sides of the horizontal support plate. The water supply pump is externally connected to a water supply pipe, and a water supply check valve is provided on the water supply pipe. The return water pump is externally connected to a return water pipe, and a return water check valve is provided on the return water pipe.

[0020] As an optimized solution, the volume metering module includes a transfer water distribution tank, and a horizontal electrically-controlled telescopic cylinder is fixed on the outer box wall of the transfer water distribution tank. The telescopic end of the electrically-controlled telescopic cylinder extends to the interior of the transfer water distribution tank and is fixedly connected to a telescopic push plate. The telescopic push plate is arranged close to the circumferential inner wall of the transfer water distribution tank, and a horizontal plunger is fixedly connected to the lateral outer end face of the telescopic push plate.

[0021] As an optimized solution, the volume metering module also includes a three-way metering tube, the lateral port of the three-way metering tube is fixedly connected to the transfer water distribution tank, the upper and lower ports of the three-way metering tube are closed, the inner diameter of the three-way metering tube is slightly larger than the outer diameter of the horizontal plunger, the three-way metering tube is a transparent glass tube, and the outer wall of the three-way metering tube is vertically marked with scales.

[0022] As an optimized solution, two vertically symmetrical floating pressure plates are provided in the three-way metering tube, and the outer diameter of the floating pressure plates is slightly smaller than the inner diameter of the three-way metering tube.

[0023] As an optimized solution, a U-shaped support plate is fixedly connected at the center of the longitudinal inner wall of the mounting base plate, and two symmetrical air transfer boxes are respectively fixedly connected to the upper and lower surfaces of the U-shaped support plate, and an air pump is respectively fixedly connected to the horizontal end surface of each of the air transfer boxes, and the air pump is connected to the air transfer box.

[0024] As an optimized solution, each of the transverse side walls of the air transfer box is externally connected with an air intake pipe, and the end of the air intake pipe is fixedly connected to the closed end surface of the three-way metering tube.

[0025] As an optimized solution, a water tank is provided between the water supply pump and the return water pump. The water tank is a horizontally arranged square box. The lower end of the water tank is fixedly connected to the center of the upper surface of the horizontal support plate. The water tank is externally connected to two circulating water pipes. The ends of the two circulating water pipes are respectively fixedly connected to the water supply pump and the return water pump.

[0026] As an optimized solution, a delivery stop valve is fixedly connected to the side outer wall of the three-way metering tube, and a delivery water pipe is fixedly connected to the end of the delivery stop valve. The delivery water pipe extends laterally and passes through the middle of the U-shaped support plate, and the delivery water pipe is inclined at a certain angle to the horizontal plane.

[0027] As an optimized solution, the flow metering module includes a flow velocity measuring tube, which is fixedly connected to the end of the water delivery pipe. The flow velocity measuring tube is a transparent glass tube. A measuring seat is provided on the outer side of the flow velocity measuring tube, and the measuring seat is fixed on the longitudinal inner wall of the mounting substrate.

[0028] As an optimized solution, the measuring seat is a U-shaped seat with a longitudinal opening, a laser probe is fixed on the inner top surface of the measuring seat, and a photosensitive signal board is fixed on the inner bottom surface of the measuring seat.

[0029] As an optimized solution, a three-way water inlet pipe is fixedly connected to the end of the flow rate measuring tube, the upper end of the three-way water inlet pipe is fixedly connected to the return water check valve, the lower end of the three-way water inlet pipe passes through the circular connecting port and extends into the weighing bucket, the lower end of the three-way water inlet pipe is fixedly connected to a telescopic spring tube, and the lower end of the telescopic spring tube extends to above the drain check valve.

[0030] As an optimized solution, the transfer water distribution tank is a horizontally arranged square box, a square fixing frame is fixedly connected to the outer peripheral wall of the transfer water distribution tank, the end of the square fixing frame is fixedly connected to the longitudinal inner wall of the mounting base plate, and the end of the water supply pipe is fixedly connected to the transfer water distribution tank.

[0031] As an optimized solution, a center console is fixed to one side of the upper surface of the mounting substrate.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The liquid metering system provided in the present invention has two functions, namely quantitative batching and parameter measurement, and can realize adaptive switching of the two functions through the coordination and linkage of various functional modules. In actual use, the various parameters of the liquid are first measured, and then quantitative batching is performed according to the various parameters of the liquid, thereby ensuring the metering accuracy.

[0034] The volume metering module provided in the present invention can limit the volume of the liquid entering the pipeline during the parameter measurement process, thereby ensuring that the amount of liquid flowing in the pipeline during the parameter measurement process is constant. Specifically, the volume metering module includes a transfer water distribution tank, and the liquid is first injected into the transfer water distribution tank from the water supply pipe, and then pushed into the three-way metering tube through the horizontal plunger telescopically arranged in the transfer water distribution tank. The three-way metering tube is provided with two upper and lower symmetrical floating pressure plates. After the liquid enters the three-way metering tube, under the action of pressure, the floating pressure plate at the bottom will sink, and the floating pressure plate at the top will float up. The scale reading between the two floating pressure plates is the liquid volume; further, after the liquid volume measurement is completed, the two air pumps are started respectively, compressed air is introduced into the three-way metering tube, and the delivery check valve is opened, so that the liquid can be completely pressed into the delivery water pipe.

[0035] The flow metering module provided in the present invention can measure the real-time flow velocity during the liquid transportation process, and obtain the instantaneous flow rate and viscosity coefficient by calculation. Specifically, the flow metering module includes a flow velocity measuring tube, a measuring seat is provided on the outer side of the flow velocity measuring tube, and a laser probe and a photosensitive signal plate are provided on the measuring seat respectively, which are opposite to each other up and down. During the flow velocity measurement process, the laser probe is turned on, and the laser emitted by the laser probe passes through the metering liquid flowing in the flow velocity measuring tube and irradiates on the photosensitive signal plate. The flow velocity of the metering liquid is measured according to the frequency shift of the signal laser, and the flow rate can be obtained from the flow velocity of the liquid, and the equivalent of the liquid transportation loss per unit length can be measured by comparing the flow velocities in different time periods, thereby obtaining the viscosity coefficient of the liquid.

[0036] The weight metering module provided in the present invention, on the one hand, weighs the unit volume of liquid during the parameter measurement process to obtain its mass, and obtains multiple parameters such as density based on the mass; on the other hand, it can also achieve the quantitative delivery of liquid by setting the weighing target value during the quantitative batching process. Specifically, the weight metering module includes a weighing bucket, and a weighing bracket and a weighing sensor are fixed at the lower end of the weighing bucket. During the weight measurement process, the metered liquid enters the weighing bucket through the three-way water inlet pipe, and the weight of the liquid is measured by the weighing sensor. The liquid density can be obtained by comparing and analyzing the liquid weight with the initial volume and loss equivalent of the liquid; according to the measured liquid parameters, the loss equivalent of the liquid during the pipeline transportation process is compensated, and the weighing target value of the weighing sensor is set. After reaching the target value, the water supply stop valve and the delivery stop valve are automatically closed, thereby closing the delivery pipeline to achieve the purpose of quantitative batching.

[0037] During use of the present invention, the metered liquid is temporarily stored in the weighing bucket after weight measurement and quantitative batching are completed. In the quantitative batching link, the drainage check valve is directly opened, and the liquid is discharged from the drainage elbow and enters the subsequent production link; in the weight measurement link, by starting the return water pump and opening the return water check valve, the liquid in the weighing bucket can be pumped into the return water pump through the spring telescopic tube and the return water pipe, and then sent to the water storage tank through the circulating water pipe to achieve recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0039] Figure 1 It is a schematic cross-sectional view of the internal structure of each module in the present invention in the main viewing direction;

[0040] Figure 2 It is a schematic cross-sectional view of the internal structure of each module in the present invention in a top view direction;

[0041] Figure 3 It is a schematic cross-sectional view of the internal structure of the weight metering module in the present invention in the side view direction;

[0042] Figure 4 It is a schematic cross-sectional view of the internal structure of the transfer water distribution tank and its internal structure in the side view direction in the present invention;

[0043] Figure 5 It is a schematic cross-sectional view of the internal structure of the flow metering module in the present invention in the side view direction;

[0044] Figure 6 It is a schematic diagram of the external overall structure of the present invention in the main viewing direction;

[0045] Figure 7 It is a schematic diagram of the external overall structure of the present invention when viewed from above.

[0046] In the figure: 1-mounting base plate, 2-support base, 3-weighing bucket, 4-weighing bracket, 5-helical spring, 6-weighing sensor, 7-square enclosure, 8-port cover, 9-circular connecting port, 10-corrugated connecting pipe, 11-drainage elbow, 12-drainage check valve, 13-horizontal support plate, 14-water supply pump, 15-return water pump, 16-water storage tank, 17-circulating water pipe, 18-water supply pipe, 19-water supply check valve, 20-return water pipe, 21-return water check valve, 22 -Transfer water distribution tank, 23-square fixed frame, 24-electrically controlled telescopic cylinder, 25-telescopic push plate, 26-horizontal plunger, 27-three-way metering tube, 28-floating pressure plate, 29-U-shaped support plate, 30-air transfer box, 31-air pump, 32-air inlet pipe, 33-delivery check valve, 34-delivery water pipe, 35-flow rate measuring tube, 36-measuring seat, 37-laser probe, 38-photosensitive signal board, 39-three-way water inlet pipe, 40-telescopic spring tube, 41-center console. DETAILED DESCRIPTION

[0047] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0048] like Figures 1 to 7 As shown, a modular liquid metering system includes a mounting substrate 1, which is a vertically arranged L-shaped plate. A weight metering module, a volume metering module and a flow metering module are respectively arranged on the mounting substrate 1.

[0049] A support base 2 is fixedly connected to one side of the upper surface of the mounting base 1 . The support base 2 is a horizontally arranged square base. The weight metering module includes a weighing bucket 3 . The weighing bucket 3 is a conical bucket with upper and lower openings. The weighing bucket 3 is arranged directly above the support base 2 .

[0050] Four centrosymmetrical weighing brackets 4 are fixedly connected to the upper surface of the supporting base 2 , and spiral springs 5 ​​and weighing sensors 6 are respectively arranged in the weighing brackets 4 .

[0051] A square enclosure 7 is provided on the outer side of the weighing bucket 3 , the inner circle of the square enclosure 7 is fixedly connected to the conical outer peripheral wall of the weighing bucket 3 , and the upper end of each weighing bracket 4 is fixedly connected to the lower surface of the square enclosure 7 .

[0052] A removable port cover 8 is provided in the upper opening of the weighing bucket 3, and a circular connecting port 9 is opened at the center of the upper surface of the port cover 8. The lower end opening of the weighing bucket 3 is connected to a corrugated connecting pipe 10, and the lower end of the corrugated connecting pipe 10 is fixed at the center of the upper surface of the supporting base 2.

[0053] A drainage elbow 11 is provided inside the support base 2, the upper end of the drainage elbow 11 passes through the inner top surface of the support base 2 and is connected to the corrugated connecting pipe 10, and the side end of the drainage elbow 11 passes through the longitudinal end surface of the support base 2 and extends to its outside.

[0054] A drainage check valve 12 is provided at the lower end of the weighing bucket 3 .

[0055] A square horizontal support plate 13 is fixedly connected to the longitudinal inner wall of the mounting base plate 1, and a transversely symmetrical water supply pump 14 and a return water pump 15 are fixedly connected to both sides of the horizontal support plate 13, respectively. A water storage tank 16 is provided between the water supply pump 14 and the return water pump 15, and the water storage tank 16 is a horizontally arranged square box, and the lower end of the water storage tank 16 is fixedly connected to the center of the upper surface of the horizontal support plate 13. The water storage tank 16 is externally connected to two circulating water pipes 17, and the ends of the two circulating water pipes 17 are respectively fixedly connected to the water supply pump 14 and the return water pump 15.

[0056] The water supply pump 14 is externally connected to a water supply pipe 18 , on which a water supply check valve 19 is provided. The water return pump 15 is externally connected to a water return pipe 20 , on which a water return check valve 21 is provided.

[0057] The volume metering module includes a transfer water distribution tank 22, which is a horizontally arranged square box. A square fixing frame 23 is fixedly connected to the outer peripheral wall of the transfer water distribution tank 22. The end of the square fixing frame 23 is fixedly connected to the longitudinal inner wall of the mounting substrate 1, and the end of the water supply pipe 18 is fixedly connected to the transfer water distribution tank 22.

[0058] A horizontal electrically controlled telescopic cylinder 24 is fixed on the outer wall of the transfer water distribution tank 22 . The telescopic end of the electrically controlled telescopic cylinder 24 extends into the interior of the transfer water distribution tank 22 and is fixedly connected with a telescopic push plate 25 . The telescopic push plate 25 is arranged close to the circumferential inner wall of the transfer water distribution tank 22 .

[0059] A horizontal plunger 26 is fixedly connected to the transverse outer end surface of the telescopic push plate 25 .

[0060] The volume metering module also includes a three-way metering tube 27, the lateral port of the three-way metering tube 27 is fixedly connected to the transfer water distribution tank 22, the upper and lower ports of the three-way metering tube 27 are closed, and the inner diameter of the three-way metering tube 27 is slightly larger than the outer diameter of the horizontal plunger 26.

[0061] The three-way metering tube 27 is a transparent glass tube, and scales are vertically marked on the outer wall of the three-way metering tube 27 .

[0062] Two vertically symmetrical floating pressure plates 28 are disposed in the three-way metering tube 27 . The outer diameter of the floating pressure plates 28 is slightly smaller than the inner diameter of the three-way metering tube 27 .

[0063] A U-shaped support plate 29 is fixedly connected at the center of the longitudinal inner wall of the mounting base 1, and two symmetrical air transfer boxes 30 are fixedly connected to the upper and lower surfaces of the U-shaped support plate 29, and an air pump 31 is fixedly connected to the horizontal end surface of each air transfer box 30, and the air pump 31 is connected to the air transfer box 30.

[0064] An air intake pipe 32 is externally connected to the lateral side wall of each air transfer box 30 , and the end of the air intake pipe 32 is fixedly connected to the closed end surface of the three-way metering pipe 27 .

[0065] A delivery check valve 33 is fixedly connected to the outer peripheral wall of the side of the three-way metering tube 27, and a delivery water pipe 34 is fixedly connected to the end of the delivery check valve 33. The delivery water pipe 34 extends horizontally and passes through the middle of the U-shaped support plate 29. The delivery water pipe 34 is inclined at a certain angle to the horizontal plane.

[0066] The flow metering module includes a flow velocity measuring tube 35, which is fixedly connected to the end of the water delivery pipe 34. The flow velocity measuring tube 35 is a transparent glass tube. A measuring seat 36 is provided on the outer side of the flow velocity measuring tube 35. The measuring seat 36 is fixed on the longitudinal inner wall of the mounting substrate 1. The measuring seat 36 is a longitudinally opened U-shaped seat. A laser probe 37 is fixed on the inner top surface of the measuring seat 36, and a photosensitive signal board 38 is fixed on the inner bottom surface of the measuring seat 36.

[0067] The end of the flow rate measuring tube 35 is fixedly connected to a three-way water inlet pipe 39, the upper end of the three-way water inlet pipe 39 is fixedly connected to the return water check valve 21, the lower end of the three-way water inlet pipe 39 passes through the circular connecting port 9 and extends into the weighing bucket 3, the lower end of the three-way water inlet pipe 39 is fixedly connected to a telescopic spring tube 40, and the lower end of the telescopic spring tube 40 extends to the top of the drain check valve 12.

[0068] A center console 41 is fixed to one side of the upper surface of the mounting base 1 .

[0069] When the present invention is used, first, the liquid to be measured is injected into the water storage tank 16, the water delivery pump 14 is started, the measured liquid is pumped into the water delivery pump 14 through the circulating water pipe 17, the water delivery check valve 19 is opened, and the measured liquid is injected into the transfer water distribution tank 22 through the water delivery pipe 18; the electric control telescopic cylinder 24 is controlled to extend, the telescopic push plate 25 is driven to move horizontally, and the horizontal plunger 26 is pushed into the three-way metering pipe 27, so as to realize the transfer of the measured liquid from the transfer water distribution tank 22 to the three-way metering pipe 27. Under the action of the buoyancy and gravity of the water, the two floating pressure plates 28 are separated. The two air pumps 31 are started respectively, and the air pumps 31 press the air into the air transfer box 30, and then inject the air into the three-way metering tube 27 through the air inlet pipe 32, thereby driving the two floating pressure plates 28 to squeeze from both sides, and at the same time open the delivery check valve 33. Under the action of pressure, the metering liquid in the three-way metering tube 27 completely flows into the delivery water pipe 34; the laser probe 37 is turned on, and the laser probe 37 emits a laser through the metering liquid flowing in the flow rate measuring tube 35, irradiating the photosensitive signal On the plate 38, the flow rate of the metering liquid is measured according to the frequency shift of the signal laser, and the flow rate can be obtained from the flow rate of the liquid. The transportation loss equivalent of the liquid per unit length can be measured by comparing the flow rates in different time periods, thereby obtaining the viscosity coefficient of the liquid; the metering liquid continues to flow and enters the weighing bucket 3 through the three-way water inlet pipe 39, and the weight of the liquid is measured by the weighing sensor 6. The liquid density can be obtained by comparing and analyzing the liquid weight with the initial volume and loss equivalent of the liquid; according to the measured liquid parameters, the weighing of the weighing sensor 6 is set. The target value is measured. After the target value is reached, the water supply check valve 19 and the delivery check valve 33 are automatically closed, thereby closing the delivery pipeline to achieve the purpose of quantitative dosing. After the liquid is metered, it can be recycled or discharged in real time. Specifically, when recycling: start the return water pump 15, open the return water check valve 21, and the liquid in the weighing bucket 3 is drawn into the return water pump 15 through the spring telescopic tube and the return water pipe 20, and then sent to the water storage tank 16 through the circulating water pipe 17. When discharging: open the drainage check valve 12, and the metered liquid is discharged through the corrugated connecting pipe 10 and the drainage elbow 11.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A modular liquid metering system, characterized in that: It comprises a mounting base plate (1), the mounting base plate (1) being a vertically arranged L-shaped plate, and the mounting base plate (1) is respectively provided with a weight metering module, a volume metering module and a flow metering module; A support base (2) is fixedly connected to one side of the upper surface of the mounting base (1); the support base (2) is a horizontally arranged square base; the weight metering module comprises a weighing hopper (3); the weighing hopper (3) is a conical hopper with upper and lower openings; the weighing hopper (3) is arranged directly above the support base (2); Four centrosymmetrical weighing brackets (4) are fixedly connected to the upper surface of the support base (2), and a coil spring (5) and a weighing sensor (6) are respectively provided in the weighing brackets (4); A square enclosure (7) is provided on the outer side of the weighing bucket (3), the inner circle of the square enclosure (7) is fixedly connected to the conical outer peripheral wall of the weighing bucket (3), and the upper end of each weighing bracket (4) is respectively fixedly connected to the lower surface of the square enclosure (7); A detachable port cover (8) is provided in the upper opening of the weighing bucket (3), a circular communication port (9) is provided at the center of the upper surface of the port cover (8), the lower end opening of the weighing bucket (3) is externally connected to a corrugated connecting pipe (10), and the lower end of the corrugated connecting pipe (10) is fixed at the center of the upper surface of the supporting base (2); A drainage elbow (11) is provided in the support base (2), an upper end of the drainage elbow (11) passes through the inner top surface of the support base (2) and is butt-connected to the corrugated connecting pipe (10), and a side end of the drainage elbow (11) passes through the longitudinal end surface of the support base (2) and extends to the outside thereof; A drainage check valve (12) is provided at the lower end of the weighing bucket (3); A square horizontal support plate (13) is fixedly connected to the longitudinal inner side wall of the mounting base plate (1), and a transversely symmetrical water supply pump (14) and a water return pump (15) are respectively fixedly connected to the two sides of the horizontal support plate (13); the water supply pump (14) is externally connected to a water supply pipe (18), and a water supply check valve (19) is provided on the water supply pipe (18); the water return pump (15) is externally connected to a water return pipe (20), and a water return check valve (21) is provided on the water return pipe (20); The volume metering module comprises a transfer water distribution box (22), a horizontal electrically controlled telescopic cylinder (24) is fixed on the outer box wall of the transfer water distribution box (22), a telescopic end of the electrically controlled telescopic cylinder (24) extends into the interior of the transfer water distribution box (22) and is fixedly connected to a telescopic push plate (25), the telescopic push plate (25) is arranged in close contact with the circumferential inner wall of the transfer water distribution box (22), and a horizontal plunger (26) is fixedly connected to the transverse outer end surface of the telescopic push plate (25); The volume metering module further comprises a three-way metering tube (27), the lateral port of the three-way metering tube (27) being fixedly connected to the transfer water distribution tank (22), the upper and lower ports of the three-way metering tube (27) being closed, the inner diameter of the three-way metering tube (27) being slightly larger than the outer diameter of the horizontal plunger (26), the three-way metering tube (27) being a transparent glass tube, and the outer wall of the three-way metering tube (27) being vertically marked with scale; Two vertically symmetrical floating pressure plates (28) are arranged inside the three-way metering tube (27), and the outer diameter of the floating pressure plates (28) is slightly smaller than the inner diameter of the three-way metering tube (27).

2. A modular liquid metering system according to claim 1, characterized in that: A U-shaped support plate (29) is fixedly connected at the center of the longitudinal inner wall of the mounting base plate (1); two symmetrical air transfer boxes (30) are fixedly connected to the upper and lower surfaces of the U-shaped support plate (29); an air pump (31) is fixedly connected to the horizontal end surface of each of the air transfer boxes (30); and the air pump (31) is connected to the air transfer box (30); An air intake pipe (32) is externally connected to the lateral side wall of each air transfer box (30), and the end of the air intake pipe (32) is fixedly connected to the closed end surface of the three-way metering pipe (27).

3. A modular liquid metering system according to claim 1, characterized in that: A water storage tank (16) is provided between the water supply pump (14) and the water return pump (15); the water storage tank (16) is a horizontally arranged square box; the lower end of the water storage tank (16) is fixedly connected to the center of the upper surface of the horizontal support plate (13); the water storage tank (16) is externally connected to two circulating water pipes (17); the ends of the two circulating water pipes (17) are respectively fixedly connected to the water supply pump (14) and the water return pump (15).

4. A modular liquid metering system according to claim 2, characterized in that: A delivery stop valve (33) is fixedly connected to the outer peripheral wall of the side of the three-way metering pipe (27), and a delivery water pipe (34) is fixedly connected to the end of the delivery stop valve (33). The delivery water pipe (34) extends transversely and passes through the middle of the U-shaped support plate (29). The delivery water pipe (34) is inclined at a certain angle to the horizontal plane.

5. A modular liquid metering system according to claim 4, characterized in that: The flow metering module comprises a flow velocity measuring tube (35), the flow velocity measuring tube (35) being fixedly connected to the end of the water delivery pipe (34), the flow velocity measuring tube (35) being a transparent glass tube, a measuring seat (36) being provided on the outer side of the flow velocity measuring tube (35), the measuring seat (36) being fixed on the longitudinal inner wall of the mounting base plate (1); The measuring seat (36) is a U-shaped seat with a longitudinal opening. A laser probe (37) is fixed on the inner top surface of the measuring seat (36), and a photosensitive signal plate (38) is fixed on the inner bottom surface of the measuring seat (36).

6. A modular liquid metering system according to claim 5, characterized in that: The end of the flow rate measuring tube (35) is fixedly connected to a three-way water inlet pipe (39), the upper end of the three-way water inlet pipe (39) is fixedly connected to the return water check valve (21), the lower end of the three-way water inlet pipe (39) passes through the circular connecting port (9) and extends into the weighing bucket (3), the lower end of the three-way water inlet pipe (39) is fixedly connected to a telescopic spring tube (40), and the lower end of the telescopic spring tube (40) extends to the top of the water discharge check valve (12).

7. A modular liquid metering system according to claim 1, characterized in that: The transfer water distribution box (22) is a horizontally arranged square box, a square fixing frame (23) is fixedly connected to the outer peripheral wall of the transfer water distribution box (22), the end of the square fixing frame (23) is fixedly connected to the longitudinal inner wall of the mounting base plate (1), and the end of the water supply pipe (18) is fixedly connected to the transfer water distribution box (22).

8. A modular liquid metering system according to claim 1, characterized in that: A central console (41) is fixed to one side of the upper surface of the mounting base plate (1).

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