CN107152958A - Mass flowmeter calibration detecting system and method based on multinomial algorithm - Google Patents

Abstract

The invention provides a mass flowmeter calibration detection system and method based on a polynomial algorithm. The system includes a calibration solution output unit, a calibration pipeline, a control unit, a standard meter and a return pipeline. The mass flow rate of the calibration solution in the calibration pipeline can be adjusted by the size of the switch opening of the calibration device, and the mass flow meter is calibrated and detected. The present invention simplifies the production process, reduces the cost of the entire system device, and greatly shortens the single batch of mass flow meters. times of production cycle, improve the product production capacity per unit time; the present invention solves the non-linear problem existing in the measurement and detection of the mass flowmeter in the state of large flow and high pressure or in the state of small flow and micro pressure, and greatly improves the product quality. Accuracy of metering applications.

Description

Mass flowmeter calibration detection system and method based on polynomial algorithm

technical field

The invention relates to the detection field, in particular to a mass flowmeter calibration detection system and method based on a polynomial algorithm.

Background technique

The mass flowmeter is a relatively accurate, fast, reliable, efficient, stable and flexible flow measuring instrument. It is widely used in petroleum processing, chemical industry and other fields. The parameters output by the mass flowmeter are mainly mass flow and density. Therefore, in the production and processing process of the instrument product, it is necessary to have a device system for mass flow calibration and detection and a device system for density calibration and detection. Since this product is widely used in petrochemical, papermaking, food and pharmaceutical industries, and its application measurement accuracy is usually between 0.1-0.5%, the price of the product is also relatively expensive. The design, production and processing technology of the mass flowmeter, as well as the calibration and detection device system of the mass flowmeter, as well as the mathematical model of the output algorithm must be scientifically and reasonably improved.

At present, the existing mass flow meter mass flow calibration and detection device system is based on the controller as the control center, through the industrial control bus to realize the mass flow meter and electronic scale that are electrically developed and to be calibrated and detected in the mass flow calibration device system And the control and operation of the drainage valve on the official road, and then realize the calibration of the online mass flowmeter under different mass flow calibrations. For the nonlinear inflection point, the linear equation with a single coefficient is used in the linear correction algorithm to solve its own nonlinear characteristics. When the application customer uses the maximum or minimum range of the product, the problem of poor accuracy will appear. In addition, the design of the existing mass flow calibration and detection system for mass flow meters is relatively complex, with more application equipment, more complex calibration and detection processes, a longer single-batch production cycle, and lower product production capacity per unit time. Therefore, it is necessary to improve the existing mass flowmeter to solve the nonlinear problem existing in the measurement and detection of the mass flowmeter in the state of high flow and high pressure or the state of small flow and micro pressure, and improve the measurement application accuracy of the product.

Contents of the invention

In view of the shortcomings of the prior art described above, the present invention provides a mass flowmeter calibration detection system and method based on polynomial algorithm to solve the above technical problems.

The mass flowmeter calibration detection system based on polynomial algorithm provided by the present invention includes:

Calibration solution output unit, used to output the calibration solution;

The calibration pipeline is used to connect with the calibration solution output unit and the mass flowmeter to be calibrated respectively;

The control unit is used to adjust the mass flow of the calibration solution in the calibration pipeline and to calibrate and detect the mass flowmeter to be calibrated;

Standard meter, used to detect the instantaneous mass flow output of the calibration medium solution in the calibration pipeline;

The return pipeline is used to return the calibration solution in the calibration pipeline to the calibration solution output unit;

The control unit completes the calibration and detection of the mass flowmeter to be calibrated by adjusting the flow rate of the calibration pipeline according to the instantaneous mass flow rate of the calibration medium solution output by the standard meter in real time.

Further, the control unit includes a controller, a first actuator switch and a second actuator switch respectively connected to the controller, the first actuator switch is arranged between the calibration solution output unit and the mass flowmeter to be calibrated, so The second actuator switch is arranged between the mass flowmeter to be calibrated and the return pipeline;

The calibration solution output unit includes a calibration solution device, a solution pump and a constant pressure and constant flow tank connected in sequence;

The return pipeline is connected with the calibration solution device.

Further, the controller obtains the mass flow rate of the standard meter and the phase difference output by all the mass flowmeters to be calibrated by adjusting the opening of the first actuator switch and the second actuator switch, and according to the phase difference, through a polynomial fitting algorithm Carry out calibration linear correction, obtain the mass flow coefficient, and write the obtained mass flow coefficient into the corresponding mass flow meter to be calibrated to complete the calibration.

Further, the control unit completes the calibration of the mass flow meter according to the mass flow coefficient, and the mass flow coefficient is obtained by the following formula:

Among them, P(X _i ) is the instantaneous mass flow output by the standard meter, a ₀ , a ₁ , a ₂ , and a ₃ are the meter coefficients of the final mass flow output of the mass flow meter;

X _i is the phase difference of the sinusoidal signal on both sides of the sensor measuring tube input and output.

Further, the controller sends an opening command to the first actuator switch and the second actuator switch, so that the calibration solution in the calibration solution device passes through the solution pump, constant pressure and constant flow irrigation, calibration pipeline, standard meter, and all mass flow rates to be calibrated in sequence. Meter and return pipe, back to the calibration solution device;

The controller sends a closing command to the second actuator switch, and controls all the mass flowmeters to be calibrated to zero;

Obtain the maximum range of the mass flowmeter to be calibrated, and select the maximum range and different values within the maximum range as the calibration point;

The controller sends an opening command to the first actuator switch, so that the mass flow rate output by the standard meter is the value of each calibration point in turn, and the mass flow rate of the standard meter at each calibration point is read with a delay, and the mass flow rate output by the mass flowmeter to be calibrated Phase difference, and store records;

The controller sends a closing command to the first actuator switch and the second actuator switch to complete the calibration.

Further, after the control unit completes the calibration, the accuracy of the mass flowmeter to be tested is obtained by comparing the total mass measured by the standard meter with the total mass measured by the mass flowmeter to be tested at the same time, and the accuracy detection is completed.

Further, the control unit determines the position of the flow detection point;

The controller sends an opening command to the second actuator switch, and adjusts the opening of the first actuator switch, so that the calibration solution in the calibration pipeline meets the flow rate at the flow detection point;

The controller sends a closing command to the second actuator switch, and clears the total measurement amount of the standard meter and the mass flow meter;

The controller sends an opening instruction to the second actuator switch, delays reading the mass flow rate of the standard meter, and reads the phase difference and mass flow rate of the mass flow meter;

The controller sends a closing command to the second actuator switch, reads the total mass measured by the standard meter, and reads the total mass measured by the mass flow meter;

Carry out the above operations in turn for all flow detection points to complete the detection of measurement accuracy.

The present invention also provides a mass flowmeter calibration detection method based on polynomial algorithm, including:

Output the calibration solution to the calibration pipeline;

Detect the instantaneous mass flow output of the calibration medium solution in the calibration pipeline;

According to the instantaneous mass flow rate of the calibration medium solution output in real time, the calibration and detection of the mass flowmeter to be calibrated is completed by adjusting the flow rate of the calibration pipeline.

Further, obtain the mass flow rate of the standard meter and the phase difference output by all the mass flowmeters to be calibrated, according to the phase difference, perform calibration linear correction through a polynomial fitting algorithm, obtain the mass flow coefficient, and write the obtained mass flow coefficient to into the corresponding mass flowmeter to be calibrated to complete the calibration;

The control unit completes the calibration of the mass flowmeter according to the mass flow coefficient, and the mass flow coefficient is obtained by the following formula:

Among them, P(X _i ) is the instantaneous mass flow output by the standard meter, a ₀ , a ₁ , a ₂ , and a ₃ are the meter coefficients of the final mass flow output of the mass flow meter;

X _i is the phase difference of the sinusoidal signal on both sides of the sensor measuring tube input and output.

Further, send an opening command to the first actuator switch and the second actuator switch, so that the calibration solution in the calibration solution device passes through the solution pump, constant pressure and constant flow irrigation, calibration pipeline, standard meter, all mass flowmeters to be calibrated and Return pipeline, return to the calibration solution device;

Send a closing command to the second actuator switch, and control all the mass flowmeters to be calibrated to zero;

Obtain the maximum range of the mass flowmeter to be calibrated, and select the maximum range and different values within the maximum range as the calibration point;

Send an open command to the first actuator switch, so that the mass flow output by the standard meter is the value of each calibration point in turn, and read the mass flow rate of the standard meter at each calibration point and the phase difference with the output of the mass flowmeter to be calibrated in a delayed manner , and store records;

Send a closing command to the first actuator switch and the second actuator switch to complete the calibration;

After the calibration is completed, the accuracy of the mass flowmeter to be tested is obtained by comparing the total mass measured by the standard meter with the total mass measured by the mass flowmeter to be tested at the same time, and the accuracy test is completed:

Determine the location of the flow detection point;

Send an opening command to the second actuator switch, and adjust the opening of the first actuator switch, so that the calibration solution in the calibration pipeline meets the flow rate at the flow detection point;

Send a closing command to the second actuator switch, and reset the metering total of the standard meter and the mass flow meter to zero;

Send an open command to the second actuator switch, delay reading the mass flow rate of the standard meter, and read the phase difference and mass flow rate of the mass flow meter;

Send a closing command to the second actuator switch, read the total mass measured by the standard meter, and read the total mass measured by the mass flow meter;

Carry out the above operations in turn for all flow detection points to complete the detection of measurement accuracy.

Beneficial effects of the present invention: the mass flowmeter calibration detection system and method based on the polynomial algorithm in the present invention can adjust the mass flow rate of the calibration solution in the calibration pipeline by controlling the opening of the front section of the calibration pipeline and the opening of the end effector switch. The mass flowmeter is calibrated and detected. The invention simplifies the production process, reduces the cost of the whole system device, greatly shortens the production cycle of a single batch of mass flowmeter, and improves the product production capacity per unit time; the invention solves the problem of mass flowmeter The non-linear problem existing in the measurement and detection under the state of large flow and high pressure or the state of small flow and micro pressure has greatly improved the measurement application accuracy of the product.

Description of drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a functional block diagram of the present invention.

Fig. 3 is a graph of phase difference and flow in an embodiment of the present invention.

detailed description

Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic ideas of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arbitrarily during actual implementation, and the component layout type may also be more complicated.

As shown in Figure 2, the mass flowmeter calibration detection system and method based on polynomial algorithm in this embodiment includes:

Calibration solution output unit, used to output the calibration solution;

The calibration pipeline is used to connect with the calibration solution output unit and the mass flowmeter to be calibrated respectively;

The control unit is used to adjust the mass flow of the calibration solution in the calibration pipeline and to calibrate and detect the mass flowmeter to be calibrated;

The standard table is used to detect the instantaneous mass flow rate of the medium solution in the calibration pipeline and the total mass of the metered output medium solution within a certain calibration measurement time; the standard table in this embodiment is to detect the instantaneous mass of the calibration medium solution in the calibration pipeline The detection unit of the flow output adjusts the pipeline flow control valve according to the instantaneous mass flow rate of the calibration medium solution output in real time, so as to realize the output of the standard mass flow rate in the calibration;

The return pipeline is used to return the calibration solution in the calibration pipeline to the calibration solution output unit.

As shown in Figure 1, in this embodiment, the entire control unit takes the controller as the core, and the controller adopts an industrial computer to control the front end of the calibration pipeline 6 and the end effector switch through the communication control bus 4 (HART bus/RS485 bus) The opening is used to adjust the mass flow rate of the calibration solution in the calibration pipeline 6. After the adjustment of the flow rate of the calibration medium solution in the calibration pipeline 6 is completed, wait until the flow rate of the medium solution in the pipeline becomes stable, and the control unit starts to obtain the mass flow rate and all of the standard table 3 on the online calibration pipeline 6 through the communication control bus. The phase difference (that is, the time difference) output by the mass flowmeter to be calibrated at this time is recorded and stored. After completing all the calibration points, the control unit uses the sampling data of the standard table and the phase difference sampling data of each individual mass flowmeter to be calibrated, uses the polynomial fitting algorithm to perform calibration linear correction calculations, and calculates the output mass flow coefficient It is written into the corresponding mass flowmeter to be calibrated through the communication control bus, and the calibration solution in the calibration pipeline 6 is returned to the calibration solution output unit through the return pipeline 5 .

In this embodiment, the control unit includes a controller, a first actuator switch 1 and a second actuator switch 2 respectively connected to the controller, and the first actuator switch is arranged on the calibration solution output unit and the mass flowmeter to be calibrated Between, the second actuator switch is set between the mass flowmeter to be calibrated and the return pipeline; the calibration solution output unit includes a calibration solution device, a solution pump and a constant pressure and constant flow tank connected in sequence; the return pipeline 6 and the calibration solution device connection. By adjusting the opening of the first actuator switch 1 and the second actuator switch 2, the control unit obtains the mass flow rate in the standard table 3 and the phase difference output by all mass flowmeters to be calibrated, and according to the phase difference, through polynomial fitting The algorithm performs linear correction of the calibration, obtains the mass flow coefficient, and writes the obtained mass flow coefficient into the corresponding mass flow meter to be calibrated to complete the calibration.

The control unit completes the calibration of the mass flowmeter according to the mass flow coefficient, which is obtained by the following formula:

Among them, P(X _i ) is the instantaneous mass flow output by the standard meter, a ₀ , a ₁ , a ₂ , and a ₃ are the meter coefficients of the final mass flow output of the mass flow meter;

X _i is the phase difference of the sinusoidal signal on both sides of the sensor measuring tube input and output.

a ₀ , a ₁ , a ₂ , and a ₃ are polynomial coefficients, which need to be solved through a linear equation system. This coefficient is also the instrument coefficient of the final mass flow output of the mass flowmeter; Xi is the _sine wave on both sides of the input and output ends of the sensor measuring tube The phase difference of the signal (unit is °);

Use the linear determinant matrix equation to solve the polynomial coefficients a0, a1, a2, a3 in formula (1), such as formula (2).

Among them, m is the number of mass flow calibration points.

In this embodiment, the control unit sends an opening instruction to the first actuator switch and the second actuator switch, so that the calibration solution in the calibration solution device passes through the solution pump, constant pressure and constant flow irrigation, calibration pipeline, standard meter, all The mass flowmeter to be calibrated and the return pipe are returned to the calibration solution device;

The control unit sends a closing command to the second actuator switch, and controls all the mass flowmeters to be calibrated to zero;

Obtain the maximum range of the mass flowmeter to be calibrated, and intercept the values of 1.0, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.15, 0.1, 0.05, and 0.02 multiples of the maximum range in sections as calibration points ;

The control unit sends an opening command to the first actuator switch, so that the mass flow rate output by the standard meter is the value of each calibration point in turn, and the mass flow rate of the standard meter at each calibration point is read with a delay, and the mass flow rate output by the mass flowmeter to be calibrated Phase difference, and store records;

The control unit sends a closing command to the first actuator switch and the second actuator switch to complete the calibration.

In this embodiment, after the calibration is completed, the industrial computer enters the automatic detection mode of mass measurement, and the industrial computer automatically controls the mass flow rate of the calibration medium solution in the calibration pipeline, and performs regular measurement. Quality and online Each instrument to be tested measures the total mass within a fixed time, calculates and outputs the accuracy of the online instrument, and reports to the production user to complete the calibration and testing.

The control unit determines the position of the flow detection point;

The control unit sends an opening command to the second actuator switch, and adjusts the opening degree of the first actuator switch, so that the calibration solution in the calibration pipeline meets the flow rate at the flow detection point;

The control unit sends a closing command to the second actuator switch, and clears the total measurement amount of the standard meter and the mass flow meter;

The control unit sends an opening instruction to the second actuator switch, delays reading the mass flow rate of the standard meter, and sequentially reads the phase difference and mass flow rate of the mass flow meter according to the flow direction;

The control unit sends a closing command to the second actuator switch, reads the total mass measured by the standard meter, and reads the total mass measured by the mass flowmeter in sequence according to the flow direction;

Carry out the above operations in turn for all flow detection points to complete the detection of measurement accuracy.

A specific embodiment is enumerated below to describe in detail:

1) The controller sends instructions to control the first actuator switch 1 and the second actuator switch 2, so that the calibration solution in the calibration solution device passes through the solution pump, flows through constant pressure and constant flow irrigation, calibration pipeline 6, standard table 3 and online All the mass flowmeters to be calibrated finally flow back to the calibration solution device through the return pipeline 5;

2) Delay for 5 minutes, so that the calibration solution fully wets the calibration pipeline 6 and all mass flow meters ready to be calibrated online;

3) The controller sends an instruction to control the second actuator switch 2 to be in the off state, and then sends an automatic zero calibration instruction to all online mass flow meters to be calibrated, and waits for the zero calibration to be completed;

4) The controller sends an instruction to obtain the range (kg/min) of the maximum mass flow rate allowed by the online calibration mass flowmeter, and then intercepts 1.0, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2 of the range , 0.15, 0.1, 0.05, and 0.02 times the value as the online mass flowmeter mass flow calibration adjustment standard value, and then record and store the calibration point data;

5) The controller sends instructions to control and adjust the opening of the first actuator switch 1, so that the output mass flow rate of the standard meter is 1.0 times the maximum mass flow range allowed by the online calibration mass flowmeter, and then stop the first execution Adjust the opening of switch 1, and delay for about 1 minute, waiting for the flow of the calibration solution in the calibration pipeline to stabilize;

6) The controller sends an instruction to read the mass flow rate of the standard meter, and then reads the phase difference value output by the mass flow meter calibrated by the online mass flow rate from front to back, and stores and records the read sampling data;

7) Repeat steps 5) to 6) to complete 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.15, 0.1, 0.05, 0.02 times of the maximum mass flow range allowed by the online calibration mass flowmeter Numeric point mass flow calibration;

8) The controller sends an instruction to control the first actuator switch 1 and the second actuator switch 2 to be in the closed state to complete the calibration of the mass flow rate.

In the actual application test verification, the system in this embodiment is used for calibration to verify the effectiveness of the polynomial algorithm in the mass flow calibration and detection device of the mass flow meter. Table 1 shows the DN25 caliber mass flow meter in the new calibration Raw data for mass flow calibration on the device:

Calibration instrument phase difference (°) Standard flow rate (kg/min) 0.0209 2.046 0.0497 4.986 0.1143 10.164 0.1591 15.140 0.2081 20.418 0.3094 30.842 0.3988 40.113 0.5099 50.457 0.5912 60.089 0.6992 70.353 0.8026 80.175 0.9006 90.459 1.0108 100.502

Table 1

Using the calibration raw data in Table 1, and then using the formulas (1) and (2) to solve the polynomial coefficients a ₀ , a ₁ , a ₂ , a ₃ , after calculation, it is obtained:

a0=-2.10836E-13;

a1=100.33172;

a2=3.16839E-12;

a3=-2.29912E-12;

Write the solved polynomial coefficients a ₀ , a ₁ , a ₂ , and a ₃ into the calibrated mass flow meter converter through the controller, and then prepare for the accuracy test of the meter.

The detection process in this embodiment is as follows:

1. The controller obtains all the data and the position of the flow detection point in the data table file of the current mass flowmeter that needs to detect the flow point;

2. The controller determines whether the metering detection of all flow detection points is completed, if not, proceed to step 3); otherwise proceed to step 11);

3. The controller sends an instruction to control the second actuator switch 2 to be fully open, and then controls and adjusts the opening of the first actuator switch 1, so that the flow of the calibration solution in the calibration pipeline through the standard meter meets the current flow detection point position. flow;

4. The controller sends an instruction to control the second actuator switch 2 to be fully closed;

5. The controller sends an instruction to reset the total amount of the standard meter and online mass flowmeter;

6. The controller sends an instruction to control the second actuator switch 2 to be fully open, with a delay of 5 minutes;

7. The controller sends instructions to read the standard mass flow, read the phase difference and mass flow of the mass flowmeter from front to back, and then store and record them in the controller in turn;

8. After a delay of 5 minutes, the controller sends an instruction to control the second actuator switch 2 to be fully closed;

9. The controller sends instructions to read the standard total mass of measurement, read the total mass measured by the mass flowmeter from front to back, and then store and record them in the controller in sequence;

10. Repeat steps 2) to 9) to complete; in the data table file, all the metering inspections that need to be metered and inspected flow points;

11. Complete the detection of measurement accuracy and report to the user.

In this embodiment, the result data table after the measurement and detection is completed is as shown in Table 2, and the result data table using the existing calibration and detection system is as shown in Table 3:

Table 2

table 3

Comparing Table 2 and Table 3, it can be seen that the calibration results of the existing calibration and detection device system are relatively poor, and the maximum deviation is 0.2957%; the calibration and detection methods in the system in this embodiment are used to calibrate the quality instrument The results are good, with a maximum deviation of 0.1788%.

Apply the detection and measurement data in Table 2, select the correlation difference (°) of the detection instrument as the abscissa, the standard meter flow rate (kg/min) and the detection instrument flow rate (kg/min) data as the ordinate, and the curve of the phase difference and the flow rate As shown in Figure 3, it can be seen from Figure 3 that the instantaneous mass flow output by the mass flow meter instrument in the system in the present embodiment is basically the same as the instantaneous mass flow output by the standard table 3, and such a result is The accuracy of the calibrated and tested mass flowmeter instrument will be infinitely close to the accuracy of the standard table 3. Moreover, this embodiment eliminates the electronic scale equipment in the existing device system, reduces the cost of the entire system device, greatly shortens the production cycle of a single batch of mass flowmeters, and improves the product production capacity per unit time; The non-linear problem existing in the measurement and detection under the state of large flow and high pressure or the state of small flow and micro pressure has greatly improved the measurement application accuracy of the product.

The above-mentioned embodiments only illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention should still be covered by the claims of the present invention.

Claims (10)

1. A mass flow meter calibration detection system based on polynomial algorithm, characterized in that, comprising: Calibration solution output unit, used to output the calibration solution; The calibration pipeline is used to connect with the calibration solution output unit and the mass flowmeter to be calibrated respectively; The control unit is used to adjust the mass flow of the calibration solution in the calibration pipeline and to calibrate and detect the mass flowmeter to be calibrated; Standard meter, used to detect the instantaneous mass flow output of the calibration medium solution in the calibration pipeline; The return pipeline is used to return the calibration solution in the calibration pipeline to the calibration solution output unit; The control unit completes the calibration and detection of the mass flowmeter to be calibrated by adjusting the flow rate of the calibration pipeline according to the instantaneous mass flow rate of the calibration medium solution output by the standard meter in real time. 2. The mass flowmeter calibration detection system based on polynomial algorithm according to claim 1, characterized in that: the control unit comprises a controller, a first actuator switch and a second actuator switch respectively connected to the controller, The first actuator switch is arranged between the calibration solution output unit and the mass flowmeter to be calibrated, and the second actuator switch is arranged between the mass flowmeter to be calibrated and the return pipeline; The calibration solution output unit includes a calibration solution device, a solution pump and a constant pressure and constant flow tank connected in sequence; The return pipeline is connected with the calibration solution device. 3. The mass flow meter calibration detection system based on polynomial algorithm according to claim 2, characterized in that: the controller obtains the mass flow rate and The phase difference output by all the mass flowmeters to be calibrated, according to the phase difference, the linear correction of the calibration is performed through the polynomial fitting algorithm, the mass flow coefficient is obtained, and the obtained mass flow coefficient is written into the corresponding mass flowmeter to be calibrated , to complete the calibration. 4. The mass flowmeter calibration and detection system based on polynomial algorithm according to claim 3, characterized in that: the control unit completes the calibration of the mass flowmeter according to the mass flow coefficient, and the mass flow coefficient is obtained by the following formula: <mrow> <mi>P</mi> <mrow> <mo>(</mo> <msub> <mi>X</mi> <mi>i</mi> </msub> <mo>)</mo> </mrow> <mo>=</mo> <msub> <mi>a</mi> <mn>3</mn> </msub> <msubsup> <mi>X</mi> <mi>i</mi> <mn>3</mn> </msubsup> <mo>+</mo> <msub> <mi>a</mi> <mn>2</mn> </msub> <msubsup> <mi>X</mi> <mi>i</mi> <mn>2</mn> </msubsup> <mo>+</mo> <msub> <mi>a</mi> <mn>1</mn> </msub> <msub> <mi>X</mi> <mi>i</mi> </msub> <mo>+</mo> <msub> <mi>a</mi> <mn>0</mn> </msub> </mrow> Among them, P(X _i ) is the instantaneous mass flow output by the standard meter, a ₀ , a ₁ , a ₂ , and a ₃ are the meter coefficients of the final mass flow output of the mass flow meter; X _i is the phase difference of the sinusoidal signal on both sides of the sensor measuring tube input and output. 5. the mass flow meter calibration detection system based on polynomial algorithm according to claim 4, is characterized in that: The controller sends an opening instruction to the first actuator switch and the second actuator switch, so that the calibration solution in the calibration solution device passes through the solution pump, constant pressure and constant flow irrigation, calibration pipeline, standard meter, all mass flowmeters to be calibrated and Return pipeline, return to the calibration solution device; The controller sends a closing command to the second actuator switch, and controls all the mass flowmeters to be calibrated to zero; Obtain the maximum range of the mass flowmeter to be calibrated, and select the maximum range and different values within the maximum range as the calibration point; The controller sends an opening command to the first actuator switch, so that the mass flow rate output by the standard meter is the value of each calibration point in turn, and the mass flow rate of the standard meter at each calibration point is read with a delay, and the mass flow rate output by the mass flowmeter to be calibrated Phase difference, and store records; The controller sends a closing command to the first actuator switch and the second actuator switch to complete the calibration. 6. The mass flowmeter calibration detection system based on polynomial algorithm according to claim 3, characterized in that: after the control unit completes the calibration, the total mass measured by the standard meter and the total mass measured by the mass flowmeter to be detected are compared at the same time , to obtain the precision of the mass flowmeter to be tested, and complete the precision test. 7. the mass flowmeter calibration detection system based on polynomial algorithm according to claim 6, is characterized in that: The control unit determines the position of the flow detection point; The controller sends an opening command to the second actuator switch, and adjusts the opening of the first actuator switch, so that the calibration solution in the calibration pipeline meets the flow rate at the flow detection point; The controller sends a closing command to the second actuator switch, and clears the total measurement amount of the standard meter and the mass flow meter; The controller sends an opening instruction to the second actuator switch, delays reading the mass flow rate of the standard meter, and reads the phase difference and mass flow rate of the mass flow meter; The controller sends a closing command to the second actuator switch, reads the total mass measured by the standard meter, and reads the total mass measured by the mass flow meter; Carry out the above operations in turn for all flow detection points to complete the detection of measurement accuracy. 8. A mass flowmeter calibration detection method based on polynomial algorithm, characterized in that, comprising: Output the calibration solution to the calibration pipeline; Detect the instantaneous mass flow output of the calibration medium solution in the calibration pipeline; According to the instantaneous mass flow rate of the calibration medium solution output in real time, the calibration and detection of the mass flowmeter to be calibrated is completed by adjusting the flow rate of the calibration pipeline. 9. The mass flowmeter calibration detection method based on polynomial algorithm according to claim 8, characterized in that: obtain the mass flow rate of the standard meter and the phase difference output by all mass flowmeters to be calibrated, according to the phase difference, through the polynomial The fitting algorithm performs linear correction of the calibration, obtains the mass flow coefficient, and writes the obtained mass flow coefficient into the corresponding mass flow meter to be calibrated to complete the calibration; The control unit completes the calibration of the mass flowmeter according to the mass flow coefficient, and the mass flow coefficient is obtained by the following formula: <mrow> <mi>P</mi> <mrow> <mo>(</mo> <msub> <mi>X</mi> <mi>i</mi> </msub> <mo>)</mo> </mrow> <mo>=</mo> <msub> <mi>a</mi> <mn>3</mn> </msub> <msubsup> <mi>X</mi> <mi>i</mi> <mn>3</mn> </msubsup> <mo>+</mo> <msub> <mi>a</mi> <mn>2</mn> </msub> <msubsup> <mi>X</mi> <mi>i</mi> <mn>2</mn> </msubsup> <mo>+</mo> <msub> <mi>a</mi> <mn>1</mn> </msub> <msub> <mi>X</mi> <mi>i</mi> </msub> <mo>+</mo> <msub> <mi>a</mi> <mn>0</mn> </msub> </mrow> Among them, P(X _i ) is the instantaneous mass flow output by the standard meter, a ₀ , a ₁ , a ₂ , and a ₃ are the meter coefficients of the final mass flow output of the mass flow meter; X _i is the phase difference of the sinusoidal signal on both sides of the sensor measuring tube input and output. 10. the mass flowmeter calibration detection method based on polynomial algorithm according to claim 9, is characterized in that: Send an open command to the first actuator switch and the second actuator switch, so that the calibration solution in the calibration solution device passes through the solution pump, constant pressure and constant flow irrigation, calibration pipeline, standard meter, all mass flowmeters to be calibrated and return pipeline in sequence , back to the calibration solution device; Send a closing command to the second actuator switch, and control all the mass flowmeters to be calibrated to zero; Obtain the maximum range of the mass flowmeter to be calibrated, and select the maximum range and different values within the maximum range as the calibration point; Send an open command to the first actuator switch, so that the mass flow output by the standard meter is the value of each calibration point in turn, and read the mass flow rate of the standard meter at each calibration point and the phase difference with the output of the mass flowmeter to be calibrated in a delayed manner , and store records; Send a closing command to the first actuator switch and the second actuator switch to complete the calibration; After the calibration is completed, the accuracy of the mass flowmeter to be tested is obtained by comparing the total mass measured by the standard meter with the total mass measured by the mass flowmeter to be tested at the same time, and the accuracy test is completed: Determine the location of the flow detection point; Send an opening command to the second actuator switch, and adjust the opening of the first actuator switch, so that the calibration solution in the calibration pipeline meets the flow rate at the flow detection point; Send a closing command to the second actuator switch, and reset the metering total of the standard meter and the mass flow meter to zero; Send an open command to the second actuator switch, delay reading the mass flow rate of the standard meter, and read the phase difference and mass flow rate of the mass flow meter; Send a closing command to the second actuator switch, read the total mass measured by the standard meter, and read the total mass measured by the mass flow meter; Carry out the above operations in turn for all flow detection points to complete the detection of measurement accuracy.