Detection and control system for tobacco leaf smoldering risk prediction and trend

Abstract

A detection and control system for predicting the risk and trend of smoldering of tobacco leaves, comprising a main industrial control board, a serial communication module connected to the main industrial control board, a module input end, an actuator output end, a power input module for providing power to the main industrial control board, and an operation display module; the respective parameters obtained by the module input end are fed back to the main industrial control board; the main industrial control board makes a judgment based on the feedback to decide whether to instruct the actuator output end to perform a corresponding action; the present invention can use automated temperature acquisition modules, weight acquisition modules, and temperature and humidity acquisition modules / dry-wet-bulb acquisition modules to detect the smoldering state of tobacco leaves, specifically to detect the dynamic changes of temperature, humidity, and moisture content of tobacco stacks and the possibility of smoldering, with high detection accuracy and precision, avoiding the influence of external environmental factors, high degree of automation, saving time and labor, reasonable system design, and stable operation.

Description

Technical Field

[0001] The invention relates to a detection and control system for tobacco leaf smoldering risk prediction and trend. Background Art

[0002] During the production and storage of cigarettes, it is necessary to frequently test whether the smoldering state of cigarettes is qualified. In the past, the technical tools used by cigarette companies to test the smoldering state of cigarettes were steel rulers and smoldering racks, which were mostly manually operated. The efficiency of repeated testing of various parameters in large quantities of cigarettes was poor, and personnel were prone to fatigue and inaccurate judgment after high-intensity work. Such testing had errors and caused inaccurate test results. To this end, we developed a detection and control system for tobacco leaf smoldering risk prediction and trend. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a detection and control system for predicting the risk and trend of smoldering of tobacco leaves, which comprises a main industrial control board, a serial communication module connected to the main industrial control board, a module input end, an actuator output end, a power input module for providing power to the main industrial control board, and an operation display module; the module input end comprises a wiring terminal and a cigarette stack temperature acquisition system, a cigarette stack weight acquisition system, an ambient temperature acquisition system, and a moisture content module connected to the wiring terminal, and the respective parameters obtained by means of the cigarette stack temperature acquisition system, the cigarette stack weight acquisition system, the ambient temperature acquisition system, and the moisture content module are fed back to the main industrial control board;

[0004] The main industrial control board makes a judgment based on the feedback to determine whether to instruct the actuator output end to perform a corresponding action; the actuator output end includes a fan, a dehumidifier and a refrigerator.

[0005] In one or more embodiments of the present invention, the power input module includes a power supply box, a high-voltage interface, a switching power supply and a power conversion board, and the power conversion board converts the power to supply power to the main control board.

[0006] In one or more embodiments of the present invention, the main industrial control board includes a power-off memory, a sensor, and an alarm input auxiliary circuit.

[0007] In one or more embodiments of the present invention, the operation display module includes a touch display screen, a light, and a control button switch.

[0008] In one or more embodiments of the present invention, the connection terminal is a 485 connection line.

[0009] In one or more embodiments of the present invention, the serial communication module is bidirectionally connected to the main industrial control board, and the serial communication module includes an RJ45 converter, a TCP / IP network interface bidirectionally connected to the RJ45 converter, and a 4G / 5G / NB / ZIGBEE wireless terminal.

[0010] In one or more embodiments of the present invention, the serial communication module is bidirectionally connected to the server end or the mobile end.

[0011] In one or more embodiments of the present invention, the actuator output end includes an actuator control unit and a switch switching device connected to the actuator unit; the switch switching device includes a relay for automatic mode switching and an emergency manual mode switch to connect to a controller output interface, and the controller output interface is connected to the fan, dehumidifier and refrigerator.

[0012] In one or more embodiments of the present invention, the smoke stack temperature collection system, the smoke stack weight collection system, the ambient temperature collection system and the moisture content module are respectively connected to the temperature collection module, the weight collection module and the temperature and humidity collection module / dry-wet-bulb collection module by means of an RS232 / 485 converter.

[0013] Compared with the background technology, the effect of the present invention is: by adopting the above-mentioned technical scheme, the present invention can use automated temperature collection module, weight collection module and temperature and humidity collection module / dry-wet bulb collection module to detect the smoldering state of tobacco leaves, specifically to detect the dynamic changes of temperature, humidity and moisture content of tobacco piles and the possibility of smoldering, with high detection accuracy and precision, avoiding the influence of external environmental factors, high degree of automation, saving time and labor, reasonable system design and stable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural block diagram of a detection and control system for tobacco leaf smoldering risk prediction and trend in one embodiment of the present invention; DETAILED DESCRIPTION

[0015] While embodiments of the invention are described in detail below, the foregoing description used specific nomenclature to provide a thorough understanding of the described embodiments.

[0016] like Figure 1 As shown, a preferred embodiment is provided, which is a detection and control system for tobacco leaf smoldering risk prediction and trend, which includes a main industrial control board, a serial communication module connected to the main industrial control board, a module input end, an actuator output end, a power input module for providing power to the main industrial control board, and an operation display module; the module input end includes a wiring terminal and a smoke stack temperature collection system, a smoke stack weight collection system, an ambient temperature collection system and a moisture content module connected to the wiring terminal, and the respective parameters obtained by means of the smoke stack temperature collection system, the smoke stack weight collection system, the ambient temperature collection system and the moisture content module are fed back to the main industrial control board; the main industrial control board makes a judgment based on the feedback to decide whether to instruct the actuator output end to perform a corresponding action; the actuator output end includes a fan, a dehumidifier and a refrigerator.

[0017] The power input module includes a power supply box, a strong power interface, a switching power supply and a power conversion board, which converts the power supply to the main control board. The main industrial control board includes a power-off memory, a sensor and an alarm input auxiliary circuit.

[0018] The operation display module includes a touch display screen, a light, and a control button switch. The connection terminal is a 485 connection line.

[0019] The serial communication module is bidirectionally connected to the main industrial control board, and the serial communication module includes an RJ45 converter, a TCP / IP network interface bidirectionally connected to the RJ45 converter, and a 4G / 5G / NB / ZIGBEE wireless terminal.

[0020] The serial communication module is bidirectionally connected to the server or mobile terminal. The actuator output end includes an actuator control unit and a switch device connected to the actuator unit; the switch device includes a relay for automatic mode switching and an emergency manual mode switch to connect to the controller output interface, and the controller output interface is connected to the fan, dehumidifier and refrigerator.

[0021] The cigarette stack temperature collection system, cigarette stack weight collection system, ambient temperature collection system and moisture content module are respectively connected to the temperature collection module, weight collection module and temperature and humidity collection module / dry-wet-bulb collection module via RS232 / 485 converter.

[0022] During implementation, the detection method at the module input end and the main industrial control board is as follows:

[0023] First, three temperature sensors are distributed from top to bottom in a smoke pile, namely t 1i , t 2i , t 3i The three temperatures are summed and averaged to obtain the characteristic temperature value (t 1i +t 2i +t 3i ) / 3=t i ;

[0024] A weight sensor is installed under the support plate below each cigarette stack to detect the weight change of the cigarette stack. The initial weight of the cigarette stack is recorded as m0, and the weight change of the cigarette stack is recorded as m. i ;

[0025] Furthermore, before each cigarette pile is placed, its initial moisture content is measured as M0;

[0026] Then, a temperature and humidity sensor is installed in the overall environment of the smoke stack to detect the changes in temperature and relative humidity, denoted as T i and

[0027] According to the above method, when the time is set to every 1 hour or 1 day, the data is tested once, which is recorded as i. In specific implementation, assuming that the mass of the dry tobacco leaves in the tobacco pile remains unchanged during the entire storage period, then the initial mass of the tobacco pile, the system test mass and the initial moisture content are known, and then it can be obtained:

[0028] m0(1-M0)=m i (1-M ei ) (1)

[0029] Right now:

[0030] M ei , during the i-th system detection, it characterizes the equilibrium moisture content and wet basis moisture content of the smoke pile.

[0031] It is known that the equilibrium moisture content equation of tobacco leaves is:

[0032]

[0033] Among them, A=0.001042, B=176.288428, c=0.659412.

[0034] Combined with i , calculated Characterized by the activity of tobacco leaves in the tobacco pile detected at the i-th moment.

[0035]

[0036] Since tobacco leaf activity can also be expressed as,

[0037]

[0038] p vi , represents the moisture pressure in the smoke pile at the i-th moment; p si Expressed as the saturated pressure of moisture in the smoke pile at the i-th moment.

[0039] in,

[0040] Then we can get

[0041] Since the system detects the changes in ambient temperature and relative humidity of the smoke stack, it is recorded as T i and According to the following formula, the water vapor partial pressure p of the environment can be obtained. vTi ,

[0042]

[0043]

[0044] p vTi , represents the moisture pressure in the smoke stack environment at the i-th moment; p sTi Expressed as the saturated pressure of moisture in the smoke stack environment at the i-th moment.

[0045] Compare vi and p vTi ,

[0046] If p vi ≥p vTi , then the system continues to operate and there is no smoldering in the smoke stack environment;

[0047] If p vi <p vTi , the system will immediately alarm that there is a possibility of smoldering in the smoke pile environment, and manual on-site inspection of the smoke pile will be carried out.

[0048] Based on the above implementation modes, in other implementation modes.

[0049] In the case of detecting the ambient temperature and humidity, a dry-bulb temperature sensor can also be used for detection. The dry-bulb temperature T i and wet bulb temperature T wi , then the following formula can be used to calculate p vTi ,

[0050]

[0051] p vTi =p sTi -66.66(T i -T wi ) (9)

[0052] The above content only obtains the possibility of smoldering in a cigarette pile. However, in the room where tobacco leaves are stored, there are n (one or more) cigarette piles. Average optimization can be further performed on the n cigarette piles to determine a parameter to characterize the situation in the entire cigarette pile room. A tobacco leaf smoldering detection method that can automatically balance the moisture content equation is used to detect the possibility of smoldering in the cigarette pile. The temperature, humidity and weight are tested to see whether they are suitable for the set values. The moisture content, water pressure and other parameters are obtained through the formula for comprehensive judgment. The detection accuracy is high, and the influence of external environmental factors is avoided, which saves time and effort. The method of the present invention has the advantages of accurate detection results and ingenious design.

[0053] However, it will be apparent to those skilled in the art that no specific details are required in order to practice the embodiments. Those skilled in the art should understand that the present invention is not limited to the above specific embodiments, and improvements and substitutions based on the present invention using the known techniques in the art are all within the scope of the present invention and should be defined by the claims.

Claims

1. A detection and control system for tobacco leaf smoldering risk prediction and trend, characterized in that: It includes a main industrial control board, a serial communication module connected to the main industrial control board, a module input end, an actuator output end, a power input module for providing power to the main industrial control board, and an operation display module; the module input end includes a wiring terminal and a cigarette stack temperature acquisition system, a cigarette stack weight acquisition system, an ambient temperature acquisition system, and a moisture content module connected to the wiring terminal, and the respective parameters obtained by means of the cigarette stack temperature acquisition system, the cigarette stack weight acquisition system, the ambient temperature acquisition system, and the moisture content module are fed back to the main industrial control board; The main industrial control board determines whether to instruct the actuator output end to perform corresponding actions according to the feedback; the actuator output end includes a fan, a dehumidifier and a refrigerator; the power input module includes a power supply box, a strong power interface, a switching power supply and a power conversion board, and the power conversion board is used to convert the power supply to the main control board; the main industrial control board includes a power-off memory, a sensor and an alarm input auxiliary circuit; The operation display module includes a touch display screen, a light, and a control button switch; the wiring terminal is a 485 connection line; the serial communication module is bidirectionally connected to the main industrial control board, and the serial communication module includes an RJ45 converter, a TCP / IP network interface bidirectionally connected to the RJ45 converter, and a 4G / 5G / NB / ZIGBEE wireless terminal; the serial communication module is bidirectionally connected to the server end or the mobile end. The actuator output end includes an actuator control unit and a switch switching device connected to the actuator unit; the switch switching device includes a relay for automatic mode switching and an emergency manual mode switch to connect to the controller output interface, and the controller output interface is connected to the fan, dehumidifier and refrigerator; the cigarette stack temperature acquisition system, cigarette stack weight acquisition system, ambient temperature acquisition system and moisture content module are respectively connected to the temperature acquisition module, weight acquisition module and temperature and humidity acquisition module / dry-wet-bulb acquisition module by means of RS232 / 485 converter; During the detection, three temperature sensors are distributed from top to bottom in a smoke pile, namely t 1i , t 2i , t 3i The three temperatures are summed and averaged to obtain the characteristic temperature value (t 1i +t 2i +t 3i ) / 3=t i ; A weight sensor is installed under the support plate below each cigarette stack to detect the weight change of the cigarette stack. The initial weight of the cigarette stack is recorded as m0, and the weight change of the cigarette stack is recorded as m. i ; Before each cigarette pile is placed, its initial moisture content is measured as M0; Then, a temperature and humidity sensor is installed in the overall environment of the smoke stack to detect the changes in temperature and relative humidity, denoted as T i and φ Ti； According to the above method, when the time is set to every 1 hour or 1 day, the data is tested once, which is recorded as i; in specific implementation, assuming that the mass of the dry tobacco leaves in the tobacco pile remains unchanged during the entire storage period, then the initial mass of the tobacco pile, the system detection mass and the initial moisture content are known, then it can be obtained: m0(1-M0)=m i (1-M ei ) Right now: M ei , the equilibrium moisture content of the tobacco pile is characterized by the wet basis moisture content during the i-th system detection; the equilibrium moisture content equation of tobacco leaves is known to be, Among them, A = 0.001042, B = 176.288428, c = 0.659412; Combined with i , and calculate φ i ,φ i Characterized by the activity of tobacco leaves in the tobacco pile detected at the i-th moment; φ i =1-exp{-100 n ·M ei n [A(t i +B)]} Since tobacco leaf activity can also be expressed as, p vi , represents the moisture pressure in the smoke pile at the i-th moment; p si It is expressed as the saturation pressure of moisture in the smoke pile at the i-th moment; in, Then we can get p vi =φ i ·p si Since the system detects the changes in ambient temperature and relative humidity of the smoke stack, it is recorded as T i and φ Ti According to the following formula, the water vapor partial pressure p of the environment can be obtained vTi , p vTi =φ Ti ·p sTi p vTi , represents the moisture pressure in the smoke stack environment at the i-th moment; p sTi It is expressed as the saturated pressure of moisture in the smoke stack environment at the i-th moment; Compare vi and p vTi , If p vi ≥p vTi , then the system continues to operate and there is no smoldering in the smoke stack environment; If p vi <p vTi , the system will immediately alarm that there is a possibility of smoldering in the smoke pile environment, and manual on-site inspection of the smoke pile will be carried out.

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