Automatic oxygen concentration regulating system and method in tobacco leaf sealed cargo pile

Abstract

The present application discloses a kind of oxygen concentration adjusting system in sealed tobacco pile in the technical field of tobacco aging and maintenance, including sealed sleeve bag, sealed sleeve bag cover is arranged outside tobacco pile;Data acquisition module is used to obtain the temperature and humidity information and oxygen concentration information of tobacco pile;Nitrogen supply module is used to transport nitrogen into sealed sleeve bag;One-way exhaust valve is arranged on sealed sleeve bag and can exhaust gas in the pile to reduce pressure;Terminal control module is electrically connected with data acquisition module and nitrogen supply module, for receiving temperature and humidity information and oxygen concentration information and controlling the nitrogen supply amount of nitrogen supply module into sealed sleeve bag.The present application improves the automation level of tobacco raw material in warehouse maintenance, reduces the increase and extension of maintenance period caused by abnormal oxygen concentration in the pile, reduces the influence degree of various external factors on the aging and maintenance process, improves the working efficiency and effectiveness of aging and maintenance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tobacco leaf aging and curing, and particularly relates to a system for adjusting oxygen concentration in a sealed tobacco leaf stack. BACKGROUND

[0002] After tobacco leaf harvesting and curing, in order to remove the green odor of the tobacco leaf and reduce the irritancy of the taste, improve the aroma quality of the taste, and adjust the chemical composition inside the tobacco leaf, a storage and aging time of about two years is required. During the aging and curing process of the tobacco leaf, according to the current relevant standards, the composition of the gas in the stack needs to be detected 1-3 times per week under different curing modes, and the oxygen concentration in the stack is adjusted in a timely manner until the relevant technical requirements are met.

[0003] However, in the daily aging and curing process of the tobacco leaf stack, the regulation of the oxygen concentration in the sealed environment is basically controlled by manual detection and manual adjustment, that is, the workers use a handheld oxygen concentration detector to detect each sealed tobacco leaf stack in the warehouse, and manually introduce nitrogen into the tobacco leaf stack with an oxygen concentration exceeding the standard until the oxygen concentration in the tobacco leaf stack meets the standard. The detection and control treatment thus produced has a certain delay and lag, especially during the factory holiday or statutory holiday period, the lag of the detection and control treatment is more prominent, and the delay and lag of the detection and control treatment are not conducive to the aging and curing of the tobacco leaf and may cause the extension of the aging and curing period of the tobacco leaf.

[0004] Therefore, how to improve the effectiveness and controllability of the detection and control treatment in the aging and oxidation process of the tobacco leaf has become a technical problem to be solved by those skilled in the art. SUMMARY

[0005] Therefore, the present application aims to provide a system for automatically adjusting the oxygen concentration in a sealed tobacco leaf stack to solve the technical problem of delay and lag in the detection and control treatment in the existing aging and oxidation process of the tobacco leaf.

[0006] The technical solution adopted by the present application is as follows: a system for automatically adjusting the oxygen concentration in a sealed tobacco leaf stack, comprising:

[0007] a sealing bag capable of being arranged outside the tobacco leaf stack;

[0008] a data acquisition module comprising a temperature and humidity collector, an oxygen concentration inspection pipeline, and a PLC data acquisition terminal, the temperature and humidity collector being arranged in the sealing bag and being wirelessly connected to the PLC data acquisition terminal, for acquiring the temperature and humidity information of the tobacco leaf stack and uploading the information to the PLC data acquisition terminal; the PLC data acquisition terminal being in communication with the inner cavities of the plurality of sealing bags one by one through the oxygen concentration inspection pipeline, for extracting the gas in the stack and acquiring the oxygen concentration information;

[0009] a nitrogen supply module, which comprises a nitrogen generator, an electrically controlled flow valve and a nitrogen delivery pipeline, the electrically controlled flow valve is arranged on the nitrogen delivery pipeline, one end of the nitrogen delivery pipeline is communicated with the nitrogen generator, and the other end is communicated with the inner cavities of the plurality of sealed sleeve bags one by one, for delivering nitrogen into the sealed sleeve bags;

[0010] a one-way exhaust valve, which is arranged on the sealed sleeve bag and can exhaust the gas in the stack to reduce the pressure when the nitrogen is delivered into the sealed sleeve bag;

[0011] a terminal control module, which is electrically connected with the data acquisition module and the electrically controlled flow valve, for receiving the temperature and humidity information and the oxygen concentration information and controlling the opening degree of the electrically controlled flow valve, so as to adjust the nitrogen delivery amount of the nitrogen supply module into the sealed sleeve bag.

[0012] Preferably, the nitrogen supply module further comprises a gas storage tank, which is arranged on the nitrogen delivery pipeline between the nitrogen generator and the electrically controlled flow valve, and a pressure sensor is arranged on the gas storage tank, the pressure sensor is associated with a trigger switch on the control circuit of the nitrogen generator, for controlling the nitrogen generator to supplement nitrogen into the gas storage tank.

[0013] Preferably, the data acquisition module further comprises an external oxygen concentration detector for acquiring the oxygen concentration information between the warehouses, which is electrically connected with the PLC data acquisition terminal.

[0014] Preferably, the one-way exhaust valve comprises a base, a valve body, a center shaft, a reset spring and a diaphragm, the base can be fixedly installed on the sealed sleeve bag, and the valve body is fixedly connected with the base; the center shaft is arranged in the inner cavity of the valve body perpendicularly to the base, the reset spring sleeve is arranged on the center shaft, one end of the reset spring abuts against the valve body, and the other end abuts against the diaphragm, a plurality of diaphragms are circumferentially distributed around the center shaft and are arranged in the guide hole of the valve body in an axially movable manner, and the diaphragm is provided with an exhaust passage for communicating the inner cavities of the valve body and the sealed sleeve bag.

[0015] Preferably, the opening pressure of the one-way exhaust valve is 0.2kpa.

[0016] Preferably, the temperature and humidity collector and the PLC data acquisition terminal are electrically connected in a lora wireless communication mode.

[0017] Preferably, the terminal control module and the electrically controlled flow valve are electrically connected in a lora wireless communication mode.

[0018] Another object of the present application is to provide a method for automatically adjusting the oxygen concentration in a sealed tobacco bale, which uses the above-mentioned system for automatically adjusting the oxygen concentration in a sealed tobacco bale, and comprises the following steps:

[0019] S10: The terminal control module periodically sends an information acquisition control instruction to the PLC data acquisition terminal, controls the PLC data acquisition terminal to extract the bale gas from each of the sealed bales through the oxygen concentration inspection pipeline, and detects the oxygen concentration information of the bale gas; at the same time, the PLC data acquisition terminal receives the temperature and humidity information wirelessly transmitted by the temperature and humidity collector in the sealed bale.

[0020] S20: The terminal control module receives the oxygen concentration information and the temperature and humidity information transmitted by the PLC data acquisition terminal, and judges whether the oxygen concentration information exceeds the preset oxygen concentration threshold corresponding to the temperature and humidity information.

[0021] S30: If the oxygen concentration information exceeds the preset oxygen concentration threshold corresponding to the temperature and humidity information, the terminal control module sends a nitrogen delivery instruction to the electric control flow valve, controls the nitrogen generator and the nitrogen delivery pipeline to deliver nitrogen into the sealed bale, until the oxygen concentration information is less than or equal to the preset oxygen concentration threshold corresponding to the temperature and humidity information.

[0022] Preferably, when the temperature of the bale gas is 35℃, the corresponding preset oxygen concentration threshold is 2%; when the temperature of the bale gas is 33℃, the corresponding preset oxygen concentration threshold is 5%.

[0023] The present application has the following advantages:

[0024] The present application uses wireless communication technology and adopts a master station and substation control mode, takes each sealed tobacco bale as an independent substation, sets a sampling point in each tobacco bale, acquires the temperature and humidity information of each sampling point by the temperature and humidity collector and wirelessly transmits it to the PLC data acquisition terminal; at the same time, the bale gas of each sampling point is extracted one by one to the PLC data acquisition terminal through the oxygen concentration inspection pipeline, and the oxygen concentration information in each tobacco bale is acquired by using the built-in oxygen concentration detector, then the acquired temperature and humidity information and oxygen concentration information are transmitted to the terminal control module, the oxygen concentration detection value and the temperature and humidity detection value are compared with the preset threshold in the terminal control module, and the opening of the electric control flow valve on the nitrogen delivery pipeline is controlled according to the comparison result, the nitrogen supply module adjusts the nitrogen delivery amount into the tobacco bale, thereby realizing the automatic adjustment of the oxygen concentration in the tobacco bale, improving the effectiveness and controllability of the inspection and control, and improving the working efficiency of the aging and maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1It is a structural schematic diagram of the oxygen concentration adjusting system in the tobacco sealed cargo pile of the present application.

[0026] Figure 2 It is a structural schematic diagram of the one-way exhaust valve.

[0027] Figure 3 It is a bottom view of the one-way exhaust valve.

[0028] Explanation of reference numerals in the drawings:

[0029] 100, sealing sleeve bag

[0030] 200, data acquisition module

[0031] 210, temperature and humidity collector; 220, oxygen concentration inspection pipeline; 230, PLC data acquisition terminal; 240, external oxygen concentration detector

[0032] 300, nitrogen supply module

[0033] 310, nitrogen generator; 320, electric control flow valve; 330, nitrogen delivery pipeline; 340, gas storage tank

[0034] 400, one-way exhaust valve

[0035] 410, base; 420, valve body; 430, center shaft; 440, reset spring; 450, diaphragm

[0036] 500, terminal control module DETAILED DESCRIPTION

[0037] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate the present application, and are not limiting to the present application.

[0038] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In addition, in the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0041] As shown in the embodiment, an automatic oxygen concentration adjusting system in a tobacco leaf sealed stack is used to automatically adjust the oxygen concentration in the tobacco leaf stack during the aging oxidation process of the tobacco leaf, so as to meet the requirement of oxygen concentration in the aging and maintenance process of the tobacco leaf; the system comprises: Figures 1-3 A sealing bag 100, the number of the sealing bag 100 is at least one, and each sealing bag 100 can be correspondingly arranged on the outside of the tobacco leaf stack to make each tobacco leaf stack in a sealed environment.

[0042] A data acquisition module 200, the data acquisition module 200 comprises a temperature and humidity collector 210, an oxygen concentration inspection pipeline 220 and a PLC data acquisition terminal 230; wherein the number of the temperature and humidity collector 210 is multiple, and the temperature and humidity collector 210 is arranged in each sealing bag 100, the temperature and humidity collector 210 is wirelessly connected with the PLC data acquisition terminal 230, and is used to obtain the temperature and humidity information of each tobacco leaf stack and upload to the PLC data acquisition terminal 230 through wireless transmission; the PLC data acquisition terminal 230 is in turn communicated with the inner cavities of the multiple sealing bags 100 through the oxygen concentration inspection pipeline 220, and is used to extract the gas in the stack and obtain the oxygen concentration information.

[0043] A nitrogen supply module 300, the nitrogen supply module 300 comprises a nitrogen generator 310, an electric control flow valve 320 and a nitrogen delivery pipeline 330, the electric control flow valve 320 is arranged on the nitrogen delivery pipeline 330, one end of the nitrogen delivery pipeline 330 is communicated with the nitrogen generator 310, and the other end is in turn communicated with the inner cavities of the multiple sealing bags 100, and is used to deliver nitrogen into the sealing bag 100.

[0044] A one-way exhaust valve 400, the number of the one-way exhaust valve 400 is multiple, and the one-way exhaust valve 400 is arranged on each sealing bag 100, and the one-way exhaust valve 400 can exhaust the gas in the stack and reduce the pressure when the nitrogen delivery pipeline 330 delivers nitrogen into the sealing bag 100.

[0045]

[0046] ​A terminal control module 500 is electrically connected with the data acquisition module 200, and is configured to receive the temperature and humidity information and the oxygen concentration information. The terminal control module 500 is electrically connected with the electrically controlled flow valve 320, and is capable of controlling the opening degree of the electrically controlled flow valve 320 according to the temperature and humidity information and the oxygen concentration information of the tobacco bale, so as to adjust the nitrogen delivery amount of the nitrogen supply module 300 to the sealed bag 100, and to realize the automatic adjustment of the oxygen concentration in the tobacco bale.

[0047] The application utilizes the wireless communication technology, and adopts the master station and substation control mode. The PLC data acquisition terminal 230 is taken as the master station, and each sealed tobacco bale is taken as the substation. Sampling points are arranged in each tobacco bale. The temperature and humidity information of each sampling point is acquired by the temperature and humidity collector 210 and is wirelessly transmitted to the PLC data acquisition terminal 230. Meanwhile, the gas in each sampling point is extracted to the PLC data acquisition terminal 230 one by one through the oxygen concentration inspection pipeline 220, and the oxygen concentration detector built-in is utilized to acquire the oxygen concentration information in each tobacco bale. Then, the acquired temperature and humidity information and oxygen concentration information are delivered to the terminal control module 500. In the terminal control module 500, the oxygen concentration detection value and the temperature and humidity detection value are compared with the preset threshold value, and the opening degree of the electrically controlled flow valve 320 on the nitrogen delivery pipeline 330 is controlled according to the comparison result, so as to realize the adjustment of the nitrogen delivery amount of the nitrogen supply module 300 to the tobacco bale, and to realize the automatic adjustment of the oxygen concentration in the tobacco bale, improve the effectiveness and controllability of the inspection and control, and improve the working efficiency of the aging and maintenance.

[0048] In a specific embodiment, as shown in Figure 1 The nitrogen supply module 300 includes a nitrogen generator 310, an electrically controlled flow valve 320, a nitrogen delivery pipeline 330 and a gas storage tank 340. The gas outlet of the nitrogen generator 310 is in communication with the gas inlet of the gas storage tank 340. The gas outlet of the gas storage tank 340 is in communication with the middle of the top of the sealed bag 100 through a plurality of nitrogen delivery pipelines 330. The electrically controlled flow valve 320 is arranged on the nitrogen delivery pipeline 330 in one-to-one correspondence, and is configured to control the on-off of the nitrogen delivery pipeline 330. A pressure sensor (not shown in the figure) for detecting the internal pressure of the gas storage tank 340 is arranged on the gas storage tank 340. A trigger switch (not shown in the figure) is arranged in series on the control circuit of the nitrogen generator 310, and is associated with the pressure sensor, that is, the pressure sensor is capable of controlling the opening and closing of the trigger switch, so as to control the nitrogen delivery of the nitrogen generator 310 to the gas storage tank 340, and to ensure the sufficient supply of nitrogen to the sealed bag 100 through the nitrogen delivery pipeline 330.

[0049] The reason for such an arrangement is that when the pressure in the gas tank 340 is lower than the set pressure, the pressure sensor activates the trigger switch to make the nitrogen generator 310 operate and supplement nitrogen into the gas tank 340; when the pressure in the gas tank 340 reaches the set pressure, the pressure sensor cuts off the trigger switch to make the nitrogen generator 310 stop working, thereby forming a reciprocating cycle to ensure the supply of the gas source. Meanwhile, the gas tank 340 is used to supply gas to the sealed bag 100, which has the advantages of high reliability and good stability, and the cost of physical transformation is relatively low.

[0050] It should be noted that the associated connection of the pressure sensor and the trigger switch is prior art, which will not be described here.

[0051] In a specific embodiment, as shown in Figure 1 , the nitrogen supply module 300 comprises a nitrogen generator 310, an electric control flow valve 320, and a nitrogen delivery pipeline 330; wherein the nitrogen generator 310 is electrically connected with the terminal control module 500, and the opening and closing of the nitrogen generator 310 can be controlled through the terminal control module 500; the number of the nitrogen delivery pipeline 330 is multiple, the gas inlet end of the nitrogen delivery pipeline 330 is in communication with the gas outlet of the nitrogen generator 310, and the gas outlet end of the nitrogen delivery pipeline 330 is in communication with the middle part of the top of the sealed bag 100 one by one, and the electric control flow valve 320 is arranged on the nitrogen delivery pipeline 330 one by one to control the on-off of the nitrogen delivery pipeline 330.

[0052] The reason for such an arrangement is that the power management system of the existing nitrogen generator 310 can be modified, the nitrogen generator 310 is controlled in the overall operation scheme, the terminal control module 500 sends operation instructions to the nitrogen generator 310, and the operation state of the nitrogen generator 310 is controlled through the power management program of the nitrogen generator 310, which not only can realize the process control and precise control of the whole system operation, but also does not involve special equipment management, and has high safety.

[0053] In a specific embodiment, as shown in Figure 1 , the one-way exhaust valve 400 is arranged on the sealed bag 100 at one end of the length direction of the tobacco bale, and the opening pressure of the one-way exhaust valve 400 is 0.2 kpa.

[0054] The reason for such an arrangement is that the opening pressure of the one-way exhaust valve 400 is set to 0.2 kpa, which can timely exhaust the gas in the sealed bag 100 when nitrogen is delivered into the sealed bag 100, so as to reduce the internal pressure of the sealed bag 100 and prevent the sealed environment of the tobacco bale from being destroyed.

[0055] In a specific embodiment, as shown in Figure 2 , Figure 3As shown, the one-way exhaust valve 400 comprises a base 410, a valve body 420, a central shaft 430, a reset spring 440 and a diaphragm 450; wherein the base 410 can be fixedly installed on the sealing sleeve bag 100, the valve body 420 is fixedly connected with the base 410, or the base 410 and the valve body 420 can be clamped and fixed on both sides of the sealing sleeve bag 100, so that the one-way exhaust valve 400 can be fixedly installed on the sealing sleeve bag 100.

[0056] The central shaft 430 is arranged in the inner cavity of the valve body 420 vertically to the base 410, and the reset spring 440 is coaxially sleeved on the central shaft 430, one end of the reset spring 440 abuts against the valve body 420, and the other end abuts against the diaphragm 450; a plurality of guide holes (not shown in the figure) are circumferentially distributed on the valve body 420 around the central shaft 430, the guide holes axially extend and penetrate through the base 410, so that the inner cavity of the valve body 420 and the inner cavity of the sealing sleeve bag 100 are communicated, and a plurality of diaphragms 450 are one-to-one correspondingly installed in the guide holes and can move axially, and an exhaust passage (not shown in the figure) for communicating the inner cavity of the valve body 420 and the inner cavity of the sealing sleeve bag 100 is arranged on the diaphragm 450.

[0057] The reason for such arrangement is that when the nitrogen supply module 300 transports nitrogen into the sealing sleeve bag 100, with the input of nitrogen, the internal pressure of the sealing sleeve bag 100 gradually increases and is greater than the opening pressure of the one-way exhaust valve 400, the diaphragm 450 moves axially in the guide hole of the valve body 420 and compresses the reset spring 440, until the exhaust passage on the diaphragm 450 communicates the inner cavity of the valve body 420 and the inner cavity of the sealing sleeve bag 100, because the inner cavity of the valve body 420 is communicated with the space outside the valve body 420, so the gas in the sealing sleeve bag 100 is discharged to the outside space, realizing the pressure reduction of the sealing sleeve bag 100. When the nitrogen supply module 300 stops transporting nitrogen into the sealing sleeve bag 100, with the exhaust of the gas in the sealing sleeve bag 100, the internal pressure of the sealing sleeve bag 100 gradually decreases and is less than the opening pressure of the one-way exhaust valve 400, under the elastic force of the reset spring 440, the diaphragm 450 moves axially in the guide hole of the valve body 420 towards the tobacco bale, until the inner cavity of the valve body 420 and the inner cavity of the sealing sleeve bag 100 are in a non-communicated state.

[0058] In a specific embodiment, as Figure 1As shown, the data acquisition module 200 includes a temperature and humidity sensor 210, an oxygen concentration monitoring pipeline 220, a PLC data acquisition terminal 230, and an external oxygen concentration detector 240. Multiple temperature and humidity sensors 210 are installed in each sealed bag 100. Each sensor 210 is wirelessly connected to the PLC data acquisition terminal 230 to acquire temperature and humidity information for each tobacco stack and upload it wirelessly to the PLC data acquisition terminal 230. The oxygen concentration monitoring pipeline 220 includes a main oxygen pipe and multiple branch oxygen pipes. One end of the main oxygen pipe is connected to the PLC data acquisition terminal 230. The air inlet of the 0 unit is connected to the air supply port, and the other end is connected to each oxygen branch pipe. The other end of each oxygen branch pipe is connected to the other end of the sealed bag 100 along its length. Each oxygen branch pipe is equipped with a control valve, which is wirelessly connected to the PLC data acquisition terminal 230 to control the opening and closing of each oxygen branch pipe. This enables the PLC data acquisition terminal 230 to connect with each sealed bag 100 one by one, and to extract the gas inside the sealed bag 100 to the PLC data acquisition terminal 230. An oxygen concentration detector is installed inside the PLC data acquisition terminal 230 to detect the oxygen concentration information of the extracted gas inside each sealed bag 100. An external oxygen concentration detector 240 is installed inside the storage compartment and is electrically connected to the PLC data acquisition terminal 230 to detect the oxygen concentration information in the storage compartment, that is, to detect the oxygen concentration information outside the sealed bag 100, and uploads it to the PLC data acquisition terminal 230 to determine whether the oxygen concentration in the storage compartment is sufficient for personnel to enter, so as to ensure the personal safety of the personnel.

[0059] In one specific embodiment, such as Figure 1 As shown, the temperature and humidity sensor 210 and the PLC data acquisition terminal 230 are connected by electrical signals using LoRa wireless communication. Figure 1 (Dashed line in the middle) The temperature and humidity collector 210 is powered by a long-lasting battery, which improves the integration of the maintenance equipment and helps to improve the airtightness of the tobacco stacks; the terminal control module 500 and the PLC data acquisition terminal 230 are connected by wired electrical signals. The terminal control module 500 analyzes the periodically collected oxygen concentration and temperature and humidity data to provide data for subsequent automatic adjustment and control; the terminal control module 500 and the electrically controlled flow valve 320 are connected by electrical signals via LoRa wireless communication. Figure 1 (Dash line in the middle), wherein the chip equipped with the electronically controlled flow valve 320 has a Lora module, which enables the electronically controlled flow valve 320 to have functions such as wireless remote control, automatic valve closing when power is off, background flow data uploading, and gas usage status monitoring.

[0060] An example of an automatic oxygen concentration regulation method within a sealed tobacco leaf stack includes the following steps:

[0061] S10: The terminal control module 500 periodically sends an information acquisition control instruction to the PLC data acquisition terminal 230, and the PLC data acquisition terminal 230 controls the oxygen concentration inspection pipeline 220 to extract the in-pile gas from each of the sealed bags 100 according to the information acquisition control instruction, and detects the oxygen concentration information of the in-pile gas; at the same time, the PLC data acquisition terminal 230 determines the temperature and humidity information of the tobacco bale wirelessly transmitted by the temperature and humidity collector 210 in the sealed bag 100 according to the information acquisition control instruction.

[0062] S20: The terminal control module 500 receives the oxygen concentration information and the temperature and humidity information transmitted by the PLC data acquisition terminal 230, and judges whether the oxygen concentration information exceeds the preset oxygen concentration threshold corresponding to the temperature and humidity information.

[0063] Specifically, when the temperature of the in-pile gas is 35℃, the corresponding preset oxygen concentration threshold is 2%; when the temperature of the in-pile gas is 33℃, the corresponding preset oxygen concentration threshold is 5%.

[0064] S30: If the oxygen concentration information exceeds the preset oxygen concentration threshold corresponding to the temperature and humidity information, the terminal control module 500 sends a nitrogen delivery instruction to the electric control flow valve 320 to control the nitrogen generator 310 and the nitrogen delivery pipeline 330 to deliver nitrogen into the sealed bag 100 until the oxygen concentration information in the sealed bag 100 is less than or equal to the preset oxygen concentration threshold corresponding to the temperature and humidity information.

[0065] Specifically, when the temperature of the tobacco bale obtained by the PLC data acquisition terminal 230 is 35℃, it is judged whether the oxygen concentration obtained by the PLC data acquisition terminal 230 is greater than 2%; if yes, the terminal control module 500 controls the nitrogen generator 310 and the nitrogen delivery pipeline 330 to deliver nitrogen into the sealed bag 100 until the oxygen concentration in the sealed bag 100 is less than 2%; if no, the next tobacco bale is disposed.

[0066] When the temperature of the tobacco bale obtained by the PLC data acquisition terminal 230 is 33℃, it is judged whether the oxygen concentration obtained by the PLC data acquisition terminal 230 is greater than 5%, if yes, the terminal control module 500 controls the nitrogen generator 310 and the nitrogen delivery pipeline 330 to deliver nitrogen into the sealed bag 100 until the oxygen concentration in the sealed bag 100 is less than 5%; if no, the next tobacco bale is disposed.

[0067] Compared with the prior art, the present application has at least the following beneficial technical effects:

[0068] The application improves the automation level of tobacco raw material storage and maintenance, reduces the increase and extension of the maintenance period caused by abnormal oxygen concentration in the stack, reduces the influence degree of various external factors on the aging and maintenance process, improves the work efficiency and effectiveness of the aging and maintenance, and has obvious management benefits.

[0069] The application realizes automatic monitoring of the whole process of tobacco raw material aging and maintenance, improves the automatic maintenance management level of tobacco raw material, reduces the risk factors in the tobacco maintenance process, lays a technical foundation for intelligent storage and maintenance, fills the technical gap of automatic operation control of tobacco gas regulation, and has strong management benefits.

[0070] The application reduces the personnel intervention in the maintenance process, improves the work efficiency of tobacco maintenance, can effectively reduce the investment and workload of detection personnel in the maintenance of the same amount of tobacco, or can reasonably and moderately expand the application scale of low-oxygen aging and maintenance on the basis of the existing number of maintenance personnel, and has great indirect economic benefits.

[0071] The above is only the preferred embodiment of the application, and it should be pointed out that for ordinary skilled persons in the art, several improvements and replacements can be made without departing from the technical principles of the application, and these improvements and replacements should also be considered as the protection scope of the application.

Claims

1. A method for automatically adjusting the oxygen concentration in a sealed tobacco bale, characterized by, The method uses a tobacco leaf sealed cargo pile oxygen concentration automatic adjusting system comprising: A sealed bag (100) capable of being covered on the outside of a tobacco leaf cargo pile; A data acquisition module (200) comprising a temperature and humidity collector (210), an oxygen concentration inspection pipeline (220), and a PLC data acquisition terminal (230), wherein the temperature and humidity collector (210) is arranged in the sealed bag (100) and is in wireless signal connection with the PLC data acquisition terminal (230), and is used to acquire temperature and humidity information of the tobacco leaf cargo pile and upload the information to the PLC data acquisition terminal (230); the PLC data acquisition terminal (230) is in one-by-one communication with the inner cavities of multiple sealed bags (100) through the oxygen concentration inspection pipeline (220), and is used to extract pile gas and acquire oxygen concentration information; A nitrogen supply module (300) comprising a nitrogen generator (310), an electric control flow valve (320), and a nitrogen delivery pipeline (330), wherein the electric control flow valve (320) is arranged on the nitrogen delivery pipeline (330), one end of the nitrogen delivery pipeline (330) is in communication with the nitrogen generator (310), the other end is in one-by-one communication with the inner cavities of multiple sealed bags (100), and the nitrogen supply module (300) is used to deliver nitrogen into the sealed bags (100); A one-way exhaust valve (400) arranged on the sealed bag (100) and capable of exhausting pile gas to reduce pressure when nitrogen is delivered into the sealed bag (100); A terminal control module (500) in electrical signal connection with the data acquisition module (200) and the electric control flow valve (320), and used to receive the temperature and humidity information and the oxygen concentration information and control the opening degree of the electric control flow valve (320) to adjust the nitrogen delivery amount of the nitrogen supply module (300) into the sealed bag (100); The nitrogen supply module (300) further comprises a gas storage tank (340) arranged on the nitrogen delivery pipeline (330) between the nitrogen generator (310) and the electric control flow valve (320), wherein the gas storage tank (340) is provided with a pressure sensor associated with a trigger switch on the control circuit of the nitrogen generator (310), and is used to control the nitrogen generator (310) to supplement nitrogen into the gas storage tank (340). The one-way exhaust valve (400) comprises a base (410), a valve body (420), a central shaft (430), a reset spring (440) and a diaphragm (450), the base (410) can be fixedly installed on the sealing sleeve bag (100), and the valve body (420) is fixedly connected with the base (410); the central shaft (430) is arranged in the inner cavity of the valve body (420) vertically to the base (410), the reset spring (440) is sleeved on the central shaft (430), one end of the reset spring (440) abuts against the valve body (420), the other end abuts against the diaphragm (450), a plurality of diaphragms (450) are circumferentially distributed around the central shaft (430) and are arranged in the guide hole of the valve body (420) in an axially movable manner, and the diaphragm (450) is provided with an exhaust passage for communicating the inner cavity of the valve body (420) and the inner cavity of the sealing sleeve bag (100); The method comprises the following steps: S10: The terminal control module (500) periodically sends an information acquisition control instruction to the PLC data acquisition terminal (230), controls the PLC data acquisition terminal (230) to extract the in-pile gas from the plurality of sealing sleeve bags (100) one by one through the oxygen concentration inspection pipeline (220), and detects the oxygen concentration information of the in-pile gas; at the same time, the PLC data acquisition terminal (230) receives the temperature and humidity information wirelessly sent by the temperature and humidity collector (210) in the sealing sleeve bag (100); S20: The terminal control module (500) receives the oxygen concentration information and the temperature and humidity information transmitted by the PLC data acquisition terminal (230), and judges whether the oxygen concentration information exceeds the preset oxygen concentration threshold corresponding to the temperature and humidity information; S30: If the oxygen concentration information exceeds the preset oxygen concentration threshold corresponding to the temperature and humidity information, the terminal control module (500) sends a nitrogen gas transmission instruction to the electric control flow valve (320), controls the nitrogen gas generator (310) and the nitrogen gas transmission pipeline (330) to transmit nitrogen gas into the sealing sleeve bag (100), and stops until the oxygen concentration information is less than or equal to the preset oxygen concentration threshold corresponding to the temperature and humidity information.

2. The method of claim 1, wherein the oxygen concentration in the tobacco bale is automatically adjusted by, When the temperature of the in-pile gas is 35℃, the corresponding preset oxygen concentration threshold is 2%; when the temperature of the in-pile gas is 33℃, the corresponding preset oxygen concentration threshold is 5%.

3. The method of claim 1, wherein the oxygen concentration in the tobacco bale is automatically adjusted by, The data acquisition module (200) further comprises an external oxygen concentration detector (240) for acquiring inter-bin oxygen concentration information, and the external oxygen concentration detector (240) is electrically connected with the PLC data acquisition terminal (230).

4. The method of claim 1, wherein the oxygen concentration in the tobacco bale is automatically adjusted by, The opening pressure of the one-way exhaust valve (400) is 0.2kpa.

5. The method of claim 1, wherein the method is characterized by: The temperature and humidity collector (210) and the PLC data acquisition terminal (230) are electrically connected in a lora wireless communication mode.

6. The method of claim 1, wherein the method is characterized by, The terminal control module (500) and the electric control flow valve (320) are electrically connected in a lora wireless communication mode.

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