Online weighing and metering device and method for fluid material

Abstract

The invention discloses an online weighing and metering device and method for a fluid material, and relates to the technical field of online weighing. According to the invention, the two groups of metering tanks connected in series, the weighing modules and the material supplementing valves are arranged, the first metering tank supplements materials to the second metering tank in time, the two groups of weighing modules respectively measure the mass change of the two groups of metering tanks in real time, and the weighing values of the two groups of weighing modules can be mutually rechecked, so that high-precision continuous metering of the metering tanks is realized, and the metering efficiency is improved. The problems of serious metering lag and low sensitivity in the metering process are solved. By arranging the pressure balance pipe and the shock-proof connector, the two groups of metering tanks and the external material bin are in a pressure balance state, and the influence of pressure on the weighing process or the material supplementing process is avoided; the influence of vibration on the metering device is effectively buffered, and especially for metering of small flow, the metering precision is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of online weighing, and in particular to an online weighing and metering device and method for fluid materials. Background Art

[0002] In order to measure the flow change, in many factories, weighing sensors are installed on large material tanks, and the change in the weighing value of the weighing sensor is used to calculate the flow. However, since the total mass of the material tank plus the material ranges from tens of kilograms to thousands of kilograms, the lag is very serious and the sensitivity is very low when measuring the change of small flow. Prior art CN212903489U provides an automatic metering and weighing device, including a discharge bin and a first weighing bin and a second weighing bin connected thereto, the first weighing bin and the second weighing bin are connected in parallel, and valves are provided between the discharge bin and the first weighing bin and between the discharge bin and the second weighing bin to replenish the two weighing bins, and weighing and metering devices are provided at the bottom of the first weighing bin and the second weighing bin. The inventor believes that in the prior art, the weighing values ​​of the two groups of weighing bins cannot be verified and verified, and there is a problem of weighing interruption when switching the weighing bins. Summary of the invention

[0003] The inventor has been engaged in feeding system work for many years. After discovering the above problems, he has conducted exploration and research with the aim of proposing an online weighing and metering device and method for fluid materials that can achieve high-precision online metering.

[0004] The technical solution adopted by the present invention to achieve its purpose is: an online weighing and metering device for fluid materials, including a fixed beam and a protective shell, the fixed beam is arranged in the middle position of the protective shell, and the first metering tank and the second metering tank are connected to the two sides of the fixed beam respectively, the bottoms of the first metering tank and the second metering tank are arranged opposite to each other, a first weighing module is provided at the bottom of the first metering tank, and a second weighing module is provided at the bottom of the second metering tank; the device also includes a control system, and the control system is electrically connected to the first weighing module and the second weighing module respectively.

[0005] The first metering tank is arranged above the fixed beam, and the second metering tank is arranged below the fixed beam and opposite to the bottom of the first metering tank. This technical solution adopts the mode of connecting two metering tanks in series, wherein the first metering tank is a material storage metering tank, and the second metering tank is a material discharge metering tank, and the first metering tank is used to replenish the second metering tank. A first weighing module is arranged at the bottom of the first metering tank, and a second weighing module is arranged at the bottom of the second metering tank, and the mass changes of the two metering tanks are weighed and measured in real time.

[0006] When the second metering tank is not charged but only discharged, the real-time flow of the second metering tank is directly obtained through the second weighing module; when the material in the second metering tank is reduced to a certain extent, the control system replenishes the second metering tank through the first metering tank. At the same time, the first weighing module records the reduction of the first metering tank, that is, the replenishment of the second metering tank, and the second weighing module records the increase of the second metering tank. According to the replenishment and increase of the second metering tank, the flow of the second metering tank during the replenishment period can be obtained.

[0007] Generally, the total mass of a material bin plus materials ranges from tens of kilograms to thousands of kilograms. When measuring changes in small flow rates, the lag is very serious and the sensitivity is very low. In order to solve this problem, this solution connects two metering tanks in series, where the first metering tank is used as a storage metering tank to replenish the second metering tank in a timely manner. In the process of real-time metering of the second metering tank, the reduction of the first metering tank recorded by the first weighing module is directly measured instead of the mass change of the material bin, so as to achieve timely measurement with high measurement sensitivity. Combined with the weighing value of the second metering tank measured in real time by the second weighing module, high-precision continuous measurement of the second metering tank is achieved.

[0008] The protective shell is a closed cuboid or cylinder that can be disassembled for maintenance and repair. The entire metering device is set in the protective shell. The metering device has high sensitivity. Placing the metering device in the protective shell can isolate the influence of the external environment on the metering and ensure the stability and safety of the metering process. The metering device can achieve high-precision metering in various environments.

[0009] Preferably, a first feeding valve is provided on the feed pipe connecting the first metering tank and the external material bin, a second feeding valve is provided on the connecting pipe connecting the first metering tank and the second metering tank, the second metering tank discharges material through the discharge pipe, and the first feeding valve and the second feeding valve are electrically connected to the control system respectively.

[0010] The first and second feeding valves are used to feed the first and second metering tanks, so that tens of kilograms or even thousands of kilograms of materials can be cut into hundreds of grams or even smaller values. For the measurement of small flow rates, the metering accuracy and stability are improved.

[0011] Preferably, one end of the feed pipe is connected to the lowest point on one side of the first metering tank, the connecting pipes are respectively connected to the lowest point on the other side of the first metering tank and the side adjacent to the discharge port of the second metering tank, and one end of the discharge pipe is connected to the discharge port of the second metering tank.

[0012] If the feed pipe is suspended in the first metering tank, it is easy to cause the residual material in the feed pipe to drip into the first metering tank irregularly, forming a source of error. Therefore, the lower end of the feed pipe is connected to the lowest point on one side of the first metering tank to achieve feeding from the lowest point of the first metering tank, preventing the residual material in the feed pipe from dripping irregularly, resulting in inaccurate measurement of the first metering tank.

[0013] In order to ensure that there is no residual liquid in the connecting pipe during the metering process, one end of the connecting pipe is connected to the lowest point on the other side of the first metering tank, so that all the materials in the first metering tank can be discharged, and the other end of the connecting pipe is connected to the opening of the second metering tank to prevent the residual materials in the connecting pipe from dripping irregularly, resulting in inaccurate metering of the second metering tank. Similarly, in order to ensure that there is no residual liquid in the discharge pipe, one end of the discharge pipe needs to be installed at the discharge port of the second metering tank.

[0014] Preferably, the first feed valve is a normally open valve, and the second feed valve is a normally closed valve.

[0015] The first refilling valve is arranged on the discharge pipe between the external material bin and the first metering tank. The first refilling valve is a normally open valve, so that the material automatically flows from the external material bin into the first metering tank based on gravity or pressure, and the first metering tank is refilled in time to ensure that the first metering tank has sufficient material.

[0016] The control system is electrically connected to the first feeding valve and the second feeding valve respectively. When metering starts, the control system closes the first feeding valve so that the material in the first metering tank is a fixed value; the control system is electrically connected to the second weighing module, and the second weighing module feeds back the weighing value to the control system in real time. When the weighing value of the second metering tank fed back to the control system by the second weighing module is less than the minimum preset value, the control system opens the second feeding valve; when the weighing value of the second metering tank fed back to the control system by the second weighing module reaches the standard preset value, the control system gives up opening the second feeding valve, and the second feeding valve closes automatically. By using the two feeding valves in combination, unimpeded flow of the flow path is achieved, thereby realizing continuous flow metering.

[0017] Preferably, the device further comprises a first pressure balance pipe and a second pressure balance pipe, wherein the first pressure balance pipe connects the external material bin and the first metering tank; and the second pressure balance pipe connects the first metering tank and the second metering tank.

[0018] The first feeding valve is a normally open valve, so that the material will automatically flow into the first metering tank based on gravity or pressure. When the material rises to the position of the second pressure balance pipe in the first metering tank, the material will automatically flow into the second metering tank through the second pressure balance pipe, and finally flow out of the discharge pipe. The first pressure balance pipe and the second pressure balance pipe are set between the first metering tank, the second metering tank and the external material bin to ensure that the pressure of the three is in a balanced state, thereby improving the stability and safety of the metering device. It is convenient for the material in the first metering tank to flow into the second metering tank, ensuring the continuity of material flow and pressure balance, and preventing the weighing process or the feeding process from being affected by pressure.

[0019] Preferably, the device further comprises a shock-absorbing connector, and both ends of the fixed beam are connected to the protective shell through the shock-absorbing connector to prevent vibration.

[0020] The fixed beam is not in direct contact with the protective shell, and is connected to the protective shell through a shock-absorbing connector, which can effectively buffer the impact of the vibration of the protective shell on the metering device, especially for the metering of small flows, thereby ensuring the metering accuracy.

[0021] Preferably, the second weighing module is a combination of two weighing sensors stacked up and down, and the difference between the weighing values ​​of the two weighing sensors is a fixed value.

[0022] Without replenishing the second metering tank, the real-time mass flow rate is directly obtained through the second weighing module. The second weighing module is composed of two weighing sensors stacked up and down, so as to achieve more stable, accurate and low-latency metering results.

[0023] The present invention also provides an online weighing and metering method for fluid materials, which adopts the above-mentioned online weighing and metering device for fluid materials. The metering method includes the following steps: when the first feeding valve is closed, the fixed value A of the first metering tank recorded by the first weighing module is obtained; when the first metering tank feeds the second metering tank, the real-time metering value B of the first metering tank recorded by the first weighing module and the real-time metering value C of the second metering tank recorded by the second weighing module are obtained; based on the fixed value A, the real-time metering value B and the real-time metering value C, the real-time flow measurement of the second metering tank is obtained.

[0024] When metering starts, close the first feeding valve. At this time, the material in the first metering tank becomes a fixed value, and the fixed value A is obtained through the first weighing module. When the first metering tank adds material to the second metering tank, the first weighing module measures the reduction in the first metering tank, that is, the amount added to the second metering tank. At the same time, the material in the second metering tank flows out through the discharge pipe, and the second weighing module detects the weight of the second metering tank in real time. The sampling results of the first weighing module and the second weighing module are calculated to obtain the mass flow rate per unit time of the second metering tank. The values ​​of the first weighing module and the second weighing module can be verified and verified with each other to achieve reliable and accurate metering.

[0025] Preferably, when the second metering tank is not replenished, the real-time flow measurement of the second metering tank is obtained according to the weighing value of the second weighing module.

[0026] The weighing value of the second weighing module is calculated by combining the weighing values ​​of the two weighing sensors to ensure stable and high-precision measurement results.

[0027] Preferably, the filling rate to the first metering tank exceeds the filling rate to the second metering tank.

[0028] In order to prevent the second metering tank from being affected, the first metering tank's filling speed should be greater than the second metering tank's filling speed. For example, the first metering tank's filling speed is more than twice the second metering tank's filling speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0030] Figure 1 It is a schematic diagram of an online weighing and metering device for fluid materials of the present invention; Figure 2 The present invention is a schematic flow chart of an online weighing and metering method for fluid materials.

[0031] Explanation of the accompanying drawings: fixed beam 1, protective shell 2, first metering tank 3, first weighing module 31, first feeding valve 32, first pressure balance pipe 33, second metering tank 4, second weighing module 41, second feeding valve 42, second pressure balance pipe 43, shock-absorbing connector 5, external material bin 6, control system 7. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The following first describes the concepts involved in the present application in conjunction with the accompanying drawings. It should be noted that the following description of each concept is only to make the content of the present application easier to understand, and does not limit the scope of protection of the present application; at the same time, the embodiments and features in the embodiments of the present application can be combined with each other in the absence of conflict. The present application will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments.

[0034] Embodiment 1 Reference Figure 1 As shown, an online weighing and metering device for fluid materials includes a fixed beam 1 and a protective shell 2. The fixed beam 1 is arranged in the middle of the protective shell 2. The first metering tank 3 and the second metering tank 4 are connected to both sides of the fixed beam 1, and the bottoms of the first metering tank 3 and the second metering tank 4 are arranged opposite to each other. A first weighing module 31 is arranged at the bottom of the first metering tank 3, and a second weighing module 41 is arranged at the bottom of the second metering tank 4; the device also includes a control system 7, which is electrically connected to the first weighing module 31 and the second weighing module 41 respectively.

[0035] The first metering tank 3 is arranged above the fixed beam 1, and the second metering tank 4 is arranged below the fixed beam 1 and opposite to the bottom of the first metering tank 3. The technical solution adopts the mode of connecting two metering tanks in series, wherein the first metering tank 3 is a material storage metering tank, and the second metering tank 4 is a material discharge metering tank, and the first metering tank 3 is used to replenish the second metering tank 4. A first weighing module 31 is arranged at the bottom of the first metering tank 3, and a second weighing module 41 is arranged at the bottom of the second metering tank 4, and the mass changes of the two metering tanks are weighed and measured in real time.

[0036] In the case where the second metering tank 4 is not charged but only discharged, the real-time flow rate of the second metering tank 4 is directly obtained through the second weighing module 41; when the material in the second metering tank 4 is reduced to a certain extent and needs to be supplemented, the control system 7 supplements the second metering tank 4 through the first metering tank 3. At the same time, the first weighing module 31 records the reduction of the first metering tank 3, that is, the supplementary amount to the second metering tank 4, and the second weighing module 41 records the increase of the second metering tank 4. According to the supplementary amount and the increase of the second metering tank 4, the flow rate of the second metering tank 4 during the supplementation period can be obtained.

[0037] Generally, the total mass of a material bin with materials added ranges from tens of kilograms to thousands of kilograms. When measuring changes in small flow rates, the lag is very serious and the sensitivity is very low. In order to solve this problem, this solution connects two metering tanks in series, wherein the first metering tank 3 is used as a material storage metering tank to replenish the second metering tank 4 in a timely manner. In the process of real-time metering of the second metering tank 4, the reduction of the first metering tank 3 recorded by the first weighing module 31 is directly measured instead of the mass change of the material bin, so as to achieve timely measurement with high measurement sensitivity. Combined with the weighing value of the second metering tank 4 measured in real time by the second weighing module 41, high-precision continuous measurement of the second metering tank 4 is achieved.

[0038] The protective shell 2 is a closed rectangular parallelepiped or cylindrical body, which can be disassembled for maintenance and repair, and the entire metering device is arranged in the protective shell 2. The metering device has high sensitivity, and the metering device is arranged in the protective shell 2, which can isolate the influence of the external environment on the metering, and ensure the stability and safety of the metering process. The metering device can achieve high-precision metering in various environments.

[0039] Reference Figure 1 As shown, a first feeding valve 32 is provided on the feed pipe connecting the first metering tank 3 and the external material bin 6, and a second feeding valve 42 is provided on the connecting pipe connecting the first metering tank 3 and the second metering tank 4. The second metering tank 4 discharges material through the discharge pipe, and the first feeding valve 32 and the second feeding valve 42 are electrically connected to the control system 7 respectively.

[0040] The first feeding valve 32 and the second feeding valve 42 are used to feed the first metering tank 3 and the second metering tank 4, so that tens of kilograms or even thousands of kilograms of materials can be cut into hundreds of grams or even smaller values, which improves the metering accuracy and stability for small flow metering.

[0041] Preferably, one end of the feed pipe is connected to the lowest point on one side of the first metering tank 3, the connecting pipes are respectively connected to the lowest point on the other side of the first metering tank 3 and the side adjacent to the discharge port of the second metering tank 4, and one end of the discharge pipe is connected to the discharge port of the second metering tank 4.

[0042] If the feed pipe is suspended in the first metering tank 3, it is easy to cause the residual material in the feed pipe to drip irregularly into the first metering tank 3, forming a source of error. Therefore, the lower end of the feed pipe is connected to the lowest point on one side of the first metering tank 3, so that the material can be replenished from the lowest point of the first metering tank 3, preventing the residual material in the feed pipe from dripping irregularly, resulting in inaccurate measurement of the first metering tank 3.

[0043] In order to achieve that there is no residual liquid in the connecting pipe during the metering process, one end of the connecting pipe is connected to the lowest point on the other side of the first metering tank 3, so that all the materials in the first metering tank 3 can be discharged, and the other end of the connecting pipe is connected to the opening of the second metering tank 4 to prevent the residual materials in the connecting pipe from dripping irregularly, resulting in inaccurate metering of the second metering tank 4. Similarly, in order to achieve that there is no residual liquid in the discharge pipe, one end of the discharge pipe needs to be installed at the discharge port of the second metering tank 4.

[0044] Preferably, the first replenishing valve 32 is a normally open valve, and the second replenishing valve 42 is a normally closed valve.

[0045] The first refilling valve 32 is arranged on the discharge pipe between the external material bin 6 and the first metering tank 3. The first refilling valve 32 is a normally open valve, so that the material automatically flows from the external material bin 6 into the first metering tank 3 based on gravity or pressure, and the first metering tank 3 is refilled in time to ensure that the first metering tank 3 has sufficient material.

[0046] The control system 7 is electrically connected to the first feeding valve 32 and the second feeding valve 42 respectively. When metering starts, the control system 7 closes the first feeding valve 32, so that the material in the first metering tank 3 is a fixed value; the control system 7 is electrically connected to the second weighing module 41, and the second weighing module 41 feeds back the weighing value to the control system 7 in real time. When the weighing value of the second metering tank 4 fed back to the control system 7 by the second weighing module 41 is lower than the lowest preset value stored in the control system 7, the control system 7 opens the second feeding valve 42; when the weighing value of the second metering tank 4 fed back to the control system 7 by the second weighing module 41 reaches the standard preset value stored in the control system 7, the control system 7 gives up opening the second feeding valve 42, and the second feeding valve 42 automatically closes, stopping the feeding of the second metering tank 4. By using the two feeding valves in combination, unimpeded flow of the flow path is achieved, thereby realizing continuous flow metering.

[0047] Preferably, the device further comprises a first pressure balance pipe 33 and a second pressure balance pipe 43 , wherein the first pressure balance pipe 33 connects the external material bin 6 and the first metering tank 3 ; and the second pressure balance pipe 43 connects the first metering tank 3 and the second metering tank 4 .

[0048] The first feeding valve 32 is a normally open valve, so that the material will automatically flow into the first metering tank 3 based on gravity or pressure. When the material rises to the position of the second pressure balance pipe 43 in the first metering tank 3, the material will automatically flow into the second metering tank 4 through the second pressure balance pipe 43, and finally flow out of the discharge pipe. The first pressure balance pipe 33 and the second pressure balance pipe 43 are arranged between the first metering tank 3, the second metering tank 4 and the external material bin 6 to ensure that the pressures of the three are in a balanced state and improve the stability and safety of the metering device. It is convenient for the material in the first metering tank 3 to flow into the second metering tank 4, to ensure the continuity of the material flow and the pressure balance, and to prevent the weighing process or the feeding process from being affected by the pressure.

[0049] Preferably, the device further comprises a shock-proof connector 5, and both ends of the fixed beam 1 are connected to the protective shell 2 through the shock-proof connector 5 to prevent vibration.

[0050] To prevent the influence of vibration on the measurement, the fixed beam 1 does not directly contact the protective shell 2, and is connected to the protective shell 2 through the shock-absorbing connector 5, which can effectively buffer the influence of the vibration of the protective shell 2 on the measurement, especially for the measurement of small flow rates, thereby ensuring the measurement accuracy.

[0051] The second weighing module 41 is a combination of two weighing sensors stacked up and down, and the difference between the weighing values ​​of the two weighing sensors is a fixed value.

[0052] Without replenishing the second metering tank 4, the real-time flow of the second metering tank 4 is directly obtained through the second weighing module 41. The second weighing module 41 is composed of two weighing sensors stacked up and down, so as to achieve a more stable, accurate and low-latency metering result.

[0053] Reference Figure 2 As shown, an online weighing and metering method for fluid materials adopts the above-mentioned online weighing and metering device for fluid materials, and the method includes the following steps: when the first feeding valve 32 is closed, the fixed value A of the first metering tank 3 recorded by the first weighing module 31 is obtained; when the first metering tank 3 feeds the second metering tank 4, the real-time metering value B of the first metering tank 3 recorded by the first weighing module 31 and the real-time metering value C of the second metering tank 4 recorded by the second weighing module 41 are obtained; according to the fixed value A, the real-time metering value B and the real-time metering value C, the real-time flow measurement of the second metering tank 4 is obtained.

[0054] When metering starts, close the first feeding valve 32, and the material in the first metering tank 3 becomes a fixed value, and the fixed value A is obtained through the first weighing module 31. When the first metering tank 3 adds material to the second metering tank 4, the first weighing module 31 measures the reduction of the first metering tank 3, that is, the amount added to the second metering tank 4. At the same time, the material in the second metering tank 4 flows out through the discharge pipe, and the second weighing module 41 detects the weight of the second metering tank 4 in real time. The sampling results of the first weighing module 31 and the second weighing module 41 are calculated to obtain the mass flow rate of the second metering tank 4 per unit time. The values ​​of the first weighing module 31 and the second weighing module 41 can be verified and checked with each other to achieve reliable and accurate metering.

[0055] When the second metering tank 4 is not replenished, the real-time flow measurement of the second metering tank 4 is obtained according to the weighing value of the second weighing module 41 .

[0056] The weighing value of the second weighing module 41 is calculated by combining the weighing values ​​of the two weighing sensors to ensure a stable and high-precision measurement result.

[0057] Preferably, the replenishment rate to the first metering tank 3 exceeds the replenishment rate to the second metering tank 4 .

[0058] In order to prevent the feeding of the second metering tank 4 from being affected, the feeding speed of the first metering tank 3 should be greater than the feeding speed of the second metering tank 4 . For example, the feeding speed of the first metering tank 3 is more than twice the feeding speed of the second metering tank 4 .

[0059] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the invention to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. An online weighing and metering device for fluid materials, comprising a fixed beam (1) and a protective shell (2), wherein the fixed beam (1) is arranged at a middle position of the protective shell (2), and is characterized in that: A first metering tank (3) and a second metering tank (4) are respectively connected to both sides of the fixed beam (1); the bottoms of the first metering tank (3) and the second metering tank (4) are arranged opposite to each other; a first weighing module (31) is provided at the bottom of the first metering tank (3); and a second weighing module (41) is provided at the bottom of the second metering tank (4); the device further comprises a control system (7); the control system (7) is respectively electrically connected to the first weighing module (31) and the second weighing module (41).

2. The online weighing and metering device according to claim 1, characterized in that: A first feeding valve (32) is provided on a feeding pipe connecting the first metering tank (3) and the external material bin (6), a second feeding valve (42) is provided on a connecting pipe connecting the first metering tank (3) and the second metering tank (4), the second metering tank (4) discharges material through a discharging pipe, and the first feeding valve (32) and the second feeding valve (42) are respectively electrically connected to the control system (7).

3. The online weighing and metering device according to claim 2, characterized in that: One end of the feed pipe is connected to the lowest point on one side of the first metering tank (3), the connecting pipes are respectively connected to the lowest point on the other side of the first metering tank (3) and a side of the second metering tank (4) adjacent to the discharge port, and one end of the discharge pipe is connected to the discharge port of the second metering tank (4).

4. The online weighing and metering device according to claim 2, characterized in that: The first material replenishment valve (32) is a normally open valve, and the second material replenishment valve (42) is a normally closed valve.

5. The online weighing and metering device according to claim 2, characterized in that: It also comprises a first pressure balancing pipe (33) and a second pressure balancing pipe (43), wherein the first pressure balancing pipe (33) connects the external material bin (6) and the first metering tank (3); and the second pressure balancing pipe (43) connects the first metering tank (3) and the second metering tank (4).

6. The online weighing and metering device according to claim 1, characterized in that: It also comprises a shock-absorbing connector (5), and both ends of the fixed beam (1) are connected to the protective shell (2) through the shock-absorbing connector (5) to prevent vibration.

7. The online weighing and metering device according to claim 1, characterized in that: The second weighing module (41) is a combination of two weighing sensors stacked up and down, and the difference between the weighing values ​​of the two weighing sensors is a fixed value.

8. An online weighing and metering method for fluid materials, characterized in that: An online weighing and metering device for fluid materials according to any one of claims 2 to 5 is used, and the metering method comprises the following steps: When the first feed valve (32) is closed, obtaining a fixed value A of the first metering tank (3) recorded by the first weighing module (31); When the first metering tank (3) replenishes the second metering tank (4), a real-time metering value B of the first metering tank (3) recorded by the first weighing module (31) and a real-time metering value C of the second metering tank (4) recorded by the second weighing module (41) are obtained; According to the fixed value A, the real-time measurement value B and the real-time measurement value C, the real-time flow measurement of the second metering tank (4) is obtained.

9. The online weighing and metering method according to claim 8, characterized in that: When the second metering tank (4) is not replenished, the real-time flow measurement of the second metering tank (4) is obtained according to the weighing value of the second weighing module (41).

10. The online weighing and metering method according to claim 8, characterized in that: The replenishment rate of the first metering tank (3) exceeds the replenishment rate of the second metering tank (4).

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