A real-time online correction method for a pulse-type mass flowmeter

Abstract

The application discloses a real-time online correction method of a pulse type mass flowmeter, and comprises the following steps: configuring a pulse equivalent δ of a cumulative amount of the pulse type mass flowmeter; when the cumulative amount of the mass flowmeter reaches the pulse equivalent δ of the cumulative amount, transmitting a cumulative amount pulse signal and real-time transmitting an instantaneous flow V at the moment to a PLC controller; whether there is an error between the cumulative amount and the instantaneous flow is corrected in real time through PLC program programming, and a compensation method is used to correct the cumulative amount of the flowmeter in real time. The cumulative amount of the pulse type mass flowmeter is corrected in real time through the PLC controller, the defects of packet loss in network transmission and a large minimum graduation value of the pulse type flowmeter are made up, and the measurement precision of the flowmeter is improved. The method is particularly used in a tobacco essence and spice application link, is used for improving the instantaneous and cumulative measurement precision of products, and thus improves the product quality and stability.

Description

Technical Field

[0001] This invention relates to the field of pulse mass flow meter technology, specifically, to a real-time online calibration method for pulse mass flow meters. Background Technology

[0002] Pulse-type mass flow meters are commonly used online liquid measurement instruments in industry. In tobacco processing, they are used for adding flavorings, fragrances, and water. The process of adding tobacco flavorings and fragrances mainly involves the coordinated operation of an electronic belt scale for weighing tobacco leaves, a feeding system, and a PLC control system for the feeding section. This system automatically adds a unit weight of tobacco leaves to the liquid feed in a specific ratio. During this process, the amount of liquid feed added strictly adheres to the feeding ratio. A smaller coefficient of variation in the feeding ratio indicates higher stability in the tobacco leaf feeding process and higher uniformity of liquid feed application.

[0003] According to the control principle of liquid application, the application accuracy of flavorings and fragrances is greatly affected by the measurement accuracy of the mass flow meter. The main reasons are: the cumulative signal of the mass flow meter is transmitted using a pulse signal method, which suffers from widespread packet loss, and the transmission equivalent is relatively large, failing to meet the requirements for higher measurement accuracy. Existing technologies typically try to minimize the transmission equivalent value, but as the transmission equivalent value decreases, the data packet loss becomes more severe, failing to effectively solve the problem. Summary of the Invention

[0004] The purpose of this invention is to provide a real-time online calibration method for pulse-type mass flow meters, which solves the problem that the application accuracy of fragrances and flavorings is greatly affected by the measurement accuracy of the mass flow meter in the prior art.

[0005] The present invention solves the above problems through the following technical solution:

[0006] A real-time online calibration method for a pulse-type mass flow meter, comprising:

[0007] Step S100: Configure the cumulative pulse equivalent δ of the pulse-type mass flow meter; when the cumulative amount of the mass flow meter reaches the cumulative pulse equivalent δ, transmit the cumulative pulse signal to the PLC controller, and at the same time transmit the instantaneous flow rate V at that moment to the PLC controller in real time.

[0008] Step S200: Write a subroutine for processing the cumulative amount of mass flow meter data. The execution cycle of the cumulative amount processing subroutine is T.

[0009] Step S300: After the nth cumulative pulse signal at time t is transmitted to the PLC controller, the instantaneous flow rate V at time t is used. t Real-time calculation and processing of the cumulative amount q that was not transmitted at time t from the mass flow meter. (t) ;

[0010] Step S400: Before the (n+1)th cumulative pulse signal is transmitted to the PLC controller, the cumulative quantity Q of the mass flow meter at time t is compensated in real time. t Q t =n×δ+q (t) ;

[0011] Step S500: After the (n+1)th cumulative pulse signal at time t' is transmitted to the PLC controller, compare the cumulative quantity q that has not been transmitted at time t' in real time. (t ' ) The relationship between the cumulative pulse equivalent δ;

[0012] Step S600: After the (n+1)th cumulative pulse signal at time t' is transmitted to the PLC controller, clear the cumulative quantity q that has not been transmitted at time t'. (t ' ) Based on the number of cumulative pulse signals and the number of lost pulse signals, calculate the cumulative quantity Q of the mass flow meter at time t'. t’ ;

[0013] Step S700: Repeat steps S300 to S600 until the measurement is completed.

[0014] As a further improvement of the present invention, in step S300, the instantaneous flow rate V at time t is used. t Real-time calculation and processing of the cumulative amount q that was not transmitted at time t from the mass flow meter. (t) Specifically, each cumulative quantity processing subroutine cycle collects the real-time instantaneous flow rate V from the mass flow meter. t Then, calculate the cumulative amount for each execution cycle of the cumulative amount processing subroutine, and then sum the cumulative amounts for each consecutive execution cycle of the cumulative amount processing subroutine to obtain the cumulative amount of the mass flow meter over a period of time, i.e., q. (t) =∑(V t ×T / 3600).

[0015] As a further improvement of the present invention, in step S500, the cumulative amount q that has not been transmitted at time t' is... (t ' ) The relationship with the cumulative pulse equivalent δ includes:

[0016] a. If (1-α)×δ≤q (t ' ) If ≤(1+α)×δ, then the cumulative amount q that has not been transmitted at time t' is... (t ' ) If the deviation is small, it is determined that the instantaneous flow rate and the cumulative flow rate of the mass flow meter are matched;

[0017] b. If k(1-α)×δ≤q (t ' )If k ≤ k(1+α)×δ, then it is determined that the cumulative pulse signal of the mass flow meter has experienced data transmission packet loss, where k is an integer greater than 1, and α can be selected according to the instrument's measurement accuracy and measurement requirements.

[0018] c. In other cases, it is determined that the instantaneous flow rate and the cumulative flow rate of the mass flow meter do not match.

[0019] As a further improvement of the present invention, in step S600, the cumulative quantity Q of the mass flow meter at time t' is calculated. t’ The method is as follows:

[0020] Q t’ =n×δ+∑(k-1)×δ.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0022] (1) Under the condition that the hardware conditions remain unchanged, the present invention adopts a real-time online calibration method for a pulse-type mass flow meter to improve the measurement accuracy of the mass flow meter and process the pulse quantity into a continuous quantity; at the same time, it calibrates the measurement accuracy and precision of the flow meter in real time, providing a basis for flow meter maintenance and verification; and it can verify the matching of the instantaneous flow rate and the cumulative quantity of the mass flow meter in real time.

[0023] (2) In the tobacco industry, this invention improves the control and measurement accuracy of the application of fragrances and flavorings, and improves the quality and stability of products. Attached Figure Description

[0024] Figure 1 This is a flowchart of a real-time online calibration method for a pulse-type mass flow meter according to the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1:

[0027] Combined with appendix Figure 1 As shown, a real-time online calibration method for a pulse-type mass flow meter includes:

[0028] Step S100: Configure the cumulative pulse equivalent δ (unit: kg) of the pulse-type mass flow meter; when the cumulative amount of the mass flow meter reaches δ, transmit the cumulative pulse signal to the PLC controller; simultaneously, transmit the instantaneous flow rate V (unit: kg / h) at that moment to the PLC controller in real time. PLC control technology is a mature technology used in industry and is not the subject of this invention; therefore, it will not be elaborated upon here.

[0029] Step S200: Write a subroutine for processing the cumulative flow of the mass flow meter. The execution cycle of the cumulative flow processing subroutine is T (in seconds).

[0030] Step S300: After the nth cumulative pulse signal at time t is transmitted to the PLC controller, the instantaneous flow rate V at time t is used. t Real-time calculation and processing of the cumulative amount q that was not transmitted at time t from the mass flow meter. (t) ;

[0031] Using the instantaneous flow rate V at time t t Real-time calculation and processing of the cumulative amount q that was not transmitted at time t from the mass flow meter. (t) Specifically, each cumulative quantity processing subroutine cycle collects the real-time instantaneous flow rate V from the mass flow meter. t Then, using the physical formula (cumulative quantity = instantaneous flow rate × time), the cumulative quantity for the execution cycle of the cumulative quantity processing subroutine is calculated. Finally, the cumulative quantities for each consecutive execution cycle of the cumulative quantity processing subroutine are summed to obtain the mass flow meter cumulative quantity over a period of time, i.e., q. (t) =∑(Vt×T / 3600);

[0032] Step S400: Before the (n+1)th cumulative pulse signal is transmitted to the PLC controller, the cumulative quantity Q of the mass flow meter at time t is compensated in real time. t (Cumulative amount at time t), i.e., Q t =n×δ+q (t) ;

[0033] Step S500: After the (n+1)th cumulative pulse signal at time t' is transmitted to the PLC controller, compare the cumulative quantity q that has not been transmitted at time t' in real time. ( t' ) The relationship between the cumulative pulse equivalent δ;

[0034] Furthermore, compare the cumulative amount q that has not been transmitted at time t' in real time. ( t' ) The relationship between the cumulative pulse equivalent δ and the total amount includes the following cases:

[0035] a. If (1-α)×δ≤q (t ' ) If q ≤ (1+α)×δ, then q(t ' ) With a small deviation, the instantaneous flow rate and cumulative flow rate of the mass flow meter are well matched, and the measurement accuracy is high.

[0036] b. If k(1-α)×δ≤q (t ' ) If k(1+α)×δ is less than or equal to k, then the cumulative pulse signal of the mass flow meter is determined to have experienced data transmission packet loss.

[0037] c. In other cases, it is determined that the instantaneous flow rate and cumulative flow rate of the mass flow meter have a low matching degree and further processing is required;

[0038] Where k is an integer greater than 1, and α can be selected according to the instrument's measurement accuracy and measurement requirements.

[0039] Step S600: After the (n+1)th cumulative pulse signal at time t' is transmitted to the PLC controller, clear the cumulative quantity q that has not been transmitted at time t'. (t ' ) Based on the number of cumulative pulse signals and the number of lost pulse signals, calculate the cumulative quantity Q of the mass flow meter at time t'. t’ Q t’ =n×δ+∑(k-1)×δ;

[0040] Step S700: Repeat steps S300 to S600 until the batch measurement in industrial production is completed.

[0041] This invention employs a real-time online calibration method for pulse-type mass flow meters. Under unchanged hardware conditions, it improves the measurement accuracy of the mass flow meter by processing pulsed quantities into continuous quantities. Simultaneously, it provides real-time online calibration of the flow meter's measurement accuracy and precision, offering a basis for flow meter maintenance and verification. Furthermore, it can verify the matching between the instantaneous flow rate and cumulative flow rate in real time. Applied to the tobacco industry, it improves the control and measurement accuracy of flavoring and fragrance application, thereby enhancing product quality and stability.

[0042] Example 2:

[0043] Corresponding to the above method embodiments, this application embodiment also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the above-described real-time online calibration method for a pulse-type mass flow meter.

[0044] Although the present invention has been described herein with reference to illustrative embodiments, the above embodiments are merely preferred embodiments of the present invention, and the implementation of the present invention is not limited to the above embodiments. It should be understood that those skilled in the art can devise many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A real-time online calibration method for a pulse-type mass flow meter, characterized in that, include: Step S100: Configure the cumulative pulse equivalent δ of the pulse-type mass flow meter; When the cumulative amount of the mass flow meter reaches the cumulative amount pulse equivalent δ, the cumulative amount pulse signal is transmitted to the PLC controller, and the instantaneous flow rate V at that moment is transmitted to the PLC controller in real time. Step S200: Write a subroutine for processing the cumulative amount of mass flow meter data. The execution cycle of the cumulative amount processing subroutine is T. Step S300: After the nth cumulative pulse signal at time t is transmitted to the PLC controller, the instantaneous flow rate V at time t is used. t Real-time calculation and processing of the cumulative amount q that was not transmitted at time t from the mass flow meter. (t） ; Step S400: Before the (n+1)th cumulative pulse signal is transmitted to the PLC controller, the cumulative quantity Q of the mass flow meter at time t is compensated in real time. t Q t =n×δ+q (t） ; Step S500: After the (n+1)th cumulative pulse signal at time t' is transmitted to the PLC controller, compare the cumulative quantity q that has not been transmitted at time t' in real time. (t ' ） The relationship between the cumulative pulse equivalent δ; In step S500, the cumulative amount q that has not been transmitted at time t' is... (t ' ） The relationship with the cumulative pulse equivalent δ includes: a. If (1-α)×δ≤q (t ' ） If ≤ (1+α)×δ, then the cumulative amount q that has not been transmitted at time t' is... (t ' ） If the deviation is small, it is determined that the instantaneous flow rate and the cumulative flow rate of the mass flow meter are matched; b. If k(1-α)×δ≤q (t ' ） If k ≤ k(1+α)×δ, then it is determined that the cumulative pulse signal of the mass flow meter has experienced data transmission packet loss, where k is an integer greater than 1, and α can be selected according to the instrument's measurement accuracy and measurement requirements. c. In other cases, it is determined that the instantaneous flow rate and the cumulative flow rate of the mass flow meter do not match; Step S600: After the (n+1)th cumulative pulse signal at time t' is transmitted to the PLC controller, clear the cumulative quantity q that has not been transmitted at time t'. (t ' ） Based on the number of cumulative pulse signals and the number of lost pulse signals, calculate the cumulative quantity Q of the mass flow meter at time t'. t’ ; In step S600, the cumulative quantity Q of the mass flow meter at time t' is calculated. t’ The method is as follows: Q t’ =n×δ+∑(k-1)×δ; Step S700: Repeat steps S300 to S600 until the measurement is completed.

2. The real-time online calibration method for a pulse-type mass flow meter according to claim 1, characterized in that, In step S300, the instantaneous flow rate V at time t is used. t Real-time calculation and processing of the cumulative amount q that was not transmitted at time t from the mass flow meter. (t） Specifically, each cumulative quantity processing subroutine cycle collects the real-time instantaneous flow rate V from the mass flow meter. t Then, calculate the cumulative amount for each execution cycle of the cumulative amount processing subroutine, and then sum the cumulative amounts for each consecutive execution cycle of the cumulative amount processing subroutine to obtain the cumulative amount of the mass flow meter over a period of time, i.e., q. (t） =∑(V t ×T / 3600).

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