Tobacco leaf temperature detection device

Abstract

The utility model relates to the technical field of tobacco leaf detection, in particular to a tobacco leaf temperature detection device, which comprises a thermal imager, a thermal protection shell and a control system, the thermal protection shell is arranged in a drying area and is provided with a hollow cavity, the thermal imager is arranged in the cavity, and the control system is arranged in the cavity. A lens is arranged at the bottom of the thermal protection shell, and the thermal imager is in communication connection with the control system. According to the utility model, the temperature of tobacco leaves is detected through the thermal imager, the thermal imager is protected by the thermal protection shell, and the thermal imager in the thermal protection shell is sealed through the lens, so that the thermal imager is prevented from being damaged due to too high ambient temperature and humidity; meanwhile, the thermal imager is aligned with the tobacco leaves through the lens, invisible infrared light emitted by the tobacco leaves is reflected to the thermal imager through the lens, a thermal image is generated through the thermal imager to detect the temperature of the tobacco leaves and transmit the temperature to the control system, and the device is suitable for tobacco leaf temperature detection in a drying area.

Description

Technical Field

[0001] The utility model relates to the technical field of tobacco leaf detection, and more specifically, to a tobacco leaf temperature detection device. Background Art

[0002] During tobacco production, dryers are used to dry and humidify tobacco leaves. The drying zone of a dryer is a high-temperature, high-humidity environment. Currently, the temperature of the hot air in the dryer's drying zone is monitored and controlled, but there is no device to measure the temperature of the tobacco leaves. To further study the effectiveness of tobacco leaf humidification, it is necessary to measure the leaf temperature.

[0003] The prior art discloses a non-contact tobacco leaf temperature measurement device within a tobacco box, comprising: a column, one disposed on each side of the tobacco box track at the exit of a vacuum rehumidifier; a telescopic cylinder fixed to the inner side of the lower ends of the two columns; a movable track fixed to the inner side of the upper ends of the two columns; a movable crossbar, each end of which is attached to the movable track and connected to the movable end of the telescopic cylinder; an infrared detector probe mounted on the movable crossbar via a mounting bracket to detect the temperature of tobacco leaves passing through the tobacco box; and an infrared detector transmitter connected to the infrared detector probe communication line to transmit the detected signal to a programmable logic controller (PLC). In this solution, the infrared detector detects the temperature of tobacco leaves passing through the tobacco box. However, when this measuring device is used to measure tobacco leaf temperature in a dryer, the high temperature and humidity environment in the drying area can easily damage the infrared detector, making the measuring device unsuitable for tobacco leaf temperature detection in the drying area. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the existing measuring devices that are easily damaged by the environment and cannot be applied to tobacco leaf temperature detection in the drying area, and to provide a tobacco leaf temperature detection device that can meet the tobacco leaf temperature detection requirements in the drying area.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A tobacco leaf temperature detection device is provided, comprising a thermal imager, a heat protection housing and a control system. The heat protection housing is installed in a drying area and is provided with a hollow cavity. The thermal imager is installed in the cavity. A lens is provided at the bottom of the heat protection housing. The thermal imager is communicatively connected to the control system.

[0007] When in use, the tobacco leaf temperature detection device of this invention is installed in the drying area. The thermal protective housing provides insulation from heat and moisture, and a lens seals the thermal imager within the housing to prevent damage to the thermal imager due to excessively high ambient temperature and humidity. Simultaneously, the thermal imager is aimed at the tobacco leaves through the lens, and the invisible infrared light emitted by the tobacco leaves is reflected by the lens to the thermal imager. The thermal imager generates a thermal image to detect the tobacco leaf temperature and transmit it to the control system. This device detects tobacco leaf temperature using a thermal imager and protects the thermal imager with a thermal protective housing, making it suitable for tobacco leaf temperature detection in drying areas.

[0008] Furthermore, the heat protection housing is connected to a mounting bracket, which is fixed to the drying area. The mounting bracket is L-shaped and can be used for hoisting or fixed installation through connectors and components.

[0009] Furthermore, the thermal protection shell is a polytetrafluoroethylene structure, which has the characteristics of heat resistance, low thermal conductivity, machinable cavity, high thermal resistance and low flammability, and can provide good protection for the thermal imager.

[0010] Furthermore, the thickness of the heat protection shell is 18 mm to 22 mm, which reduces the cost of the heat protection shell while achieving a good heat protection effect.

[0011] Furthermore, the lens is a zinc selenide lens, which has the advantages of good transmittance to long-wave infrared light and heat resistance.

[0012] Furthermore, the device further includes a temperature measurement module and a heat exchange module. The temperature measurement module is installed in the cavity and is used to measure the temperature in the cavity and the temperature of the thermal imager. The heat exchange module includes a heat exchange jacket, a circulating chiller, and a first pressure regulating valve. The heat exchange jacket is installed in the cavity and is arranged around the periphery of the thermal imager. One end of the heat exchange jacket is provided with a water inlet, which passes through the thermal protection shell and communicates with one end of the circulating chiller through the first pressure regulating valve. The other end of the heat exchange jacket is provided with a water outlet, which passes through the thermal protection shell and communicates with the other end of the circulating chiller. The temperature measurement module and the first pressure regulating valve are respectively connected to the control system. The circulating chiller supplies cooling liquid to the heat exchange jacket for heat exchange. The temperature in the cavity and the temperature of the thermal imager are detected by the temperature measurement module and fed back to the control system to form temperature feedback. The control system controls the first pressure regulating valve to adjust the pressure of the liquid in the heat exchange jacket so that the steady-state temperature in the cavity meets the required level.

[0013] Furthermore, the heat exchange jacket is a spiral tubular structure, and the heat exchange jacket is a copper structure, which has the characteristics of good thermal conductivity and can quickly exchange heat.

[0014] Furthermore, the heat exchange module further includes an air supply module and a second pressure regulating valve. The heat protection housing is provided with an air inlet and an air outlet, the air inlet and the air outlet being connected through the cavity. The air inlet is connected to the air supply module via the second pressure regulating valve, and the second pressure regulating valve is in communication with the control system. The air supply module supplies gas at a certain pressure to the air inlet to cool the cavity and the thermal imager therein. The heat exchanged gas is discharged from the air outlet. Simultaneously, the temperature within the cavity and the temperature of the thermal imager are detected by the temperature measurement module and are fed back to the control system to form temperature feedback. The control system controls the second pressure regulating valve to adjust the gas pressure so that the steady-state temperature within the cavity meets the required level, while also utilizing the gas to reduce temperature non-uniformity within the cavity.

[0015] Furthermore, the heat exchange module also includes a gas muffler, and the gas outlet is connected to the gas muffler to reduce the noise of the high-pressure gas.

[0016] Furthermore, the control system includes an industrial control system and a display, and the temperature measurement module, the first pressure regulating valve, the second pressure regulating valve, the thermal imager, and the display are respectively connected to the industrial control system. Based on the heat exchange of the heat protection shell with the liquid in the heat exchange sleeve, the air supply module supplies gas at a certain pressure to the air inlet to cool the cavity and the thermal imager therein. The heat exchanged gas is discharged from the air outlet. At the same time, the temperature measurement module detects the temperature in the cavity and the temperature of the thermal imager, and the temperature feedback is generated to the control system. The control system controls the first pressure regulating valve and the second pressure regulating valve to adjust the pressure of the liquid and the pressure of the gas, respectively, so that the steady-state temperature in the cavity meets the required level. At the same time, the thermal imager detects the temperature of the tobacco leaves and displays it on the display.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The temperature of tobacco leaves is detected by a thermal imager. At the same time, the thermal imager is sealed with a thermal protective shell to prevent damage due to excessive ambient temperature and humidity.

[0019] 2. The circulating chiller supplies water to exchange heat with the thermal protection shell, and the air supply module supplies gas to exchange heat with the cavity and reduce the temperature unevenness in the cavity;

[0020] 3. Regulate the temperature through the control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a tobacco leaf temperature detection device in an embodiment of the present utility model;

[0022] Figure 2 This is a schematic structural diagram of the heat protection housing in an embodiment of the present utility model;

[0023] Figure 3 This is a schematic structural diagram of a heat exchange jacket in an embodiment of the present utility model;

[0024] Figure 4 This is a schematic diagram of the installation of the heat exchange module in the embodiment of the present utility model;

[0025] Figure 5 This is a block diagram of the heat exchange principle of the heat exchange module in the embodiment of the present utility model.

[0026] In the attached figure: 1-thermal protection shell; 11-light window; 12-lens; 13-air inlet; 14-air outlet; 2-heat exchange jacket; 21-water inlet; 22-water outlet; 3-circulating chiller; 4-first pressure regulating valve; 5-air supply module; 6-second pressure regulating valve; 7-gas silencer. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic, not actual, representations. They should not be construed as limiting this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted from the drawings.

[0028] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and so on indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0029] Example 1

[0030] This embodiment is the first embodiment of the tobacco leaf temperature detection device, which includes a thermal imager, a heat protection shell 1 and a control system. The heat protection shell 1 is installed in the drying area. The heat protection shell 1 has a hollow cavity. The thermal imager is installed in the cavity. A lens 12 is provided at the bottom of the heat protection shell 1. The thermal imager is connected to the control system for communication. Figure 1 、 Figure 5 shown.

[0031] When using the above-mentioned tobacco leaf temperature detection device, the heat-protective housing 1 is installed in the drying area. The heat-protective housing 1 provides insulation and moisture isolation, and the thermal imager inside the heat-protective housing 1 is sealed via the lens 12 to prevent damage to the thermal imager due to excessively high ambient temperature and humidity. At the same time, the thermal imager is aimed at the tobacco leaves through the lens 12. The invisible infrared light emitted by the tobacco leaves is reflected by the lens 12 to the thermal imager. The thermal imager generates a thermal image to detect the tobacco leaf temperature and transmit it to the control system. The tobacco leaf temperature detection device of this embodiment can detect the tobacco leaf temperature using a thermal imager and protect the thermal imager, and is suitable for tobacco leaf temperature detection in drying areas.

[0032] Specifically, if Figure 2 As shown, a light window 11 is provided at the bottom of the heat protection housing 1 , and a lens 12 is installed in the light window 11 . The lens 12 is used to seal the heat protection housing 1 and reflect infrared light emitted by an object.

[0033] The heat protection housing 1 is connected to a mounting bracket, which is arranged in the drying area. Specifically, the mounting bracket is L-shaped and can be used for hanging or fixed installation through connectors and components.

[0034] The heat protection shell 1 is a polytetrafluoroethylene structure, which has the characteristics of heat resistance, low thermal conductivity, machinable cavity, high thermal resistance and low flammability, and can provide good protection for the thermal imager.

[0035] The thickness of the heat protection shell 1 is 18 mm to 22 mm. Specifically, the thickness of the heat protection shell 1 is 20 mm, which reduces the cost of the heat protection shell 1 while achieving a good heat protection effect.

[0036] The lens 12 is a zinc selenide lens, which has the advantages of good transmittance to long-wave infrared light and heat resistance.

[0037] Example 2

[0038] This embodiment is the second embodiment of the tobacco leaf temperature detection device. This embodiment is similar to the first embodiment, except that it also includes a temperature measurement module and a heat exchange module. The temperature measurement module is installed in the cavity. The temperature measurement module is used to measure the temperature in the cavity and the temperature of the thermal imager. The heat exchange module includes a heat exchange jacket 2, a circulating chiller 3 and a first pressure regulating valve 4. The heat exchange jacket 2 is arranged in the cavity and the heat exchange jacket 2 is arranged on the periphery of the thermal imager. One end of the heat exchange jacket 2 is provided with a water inlet 21, the water inlet 21 passes through the heat protection shell 1 and is connected to one end of the circulating chiller 3 through the first pressure regulating valve 4. The other end of the heat exchange jacket 2 is provided with a water outlet 22, the water outlet 22 passes through the heat protection shell 1 and is connected to the other end of the circulating chiller 3. The temperature measurement module and the first pressure regulating valve 4 are respectively communicated with the control system, such as Figure 4 、 Figure 5 shown.

[0039] The above-mentioned tobacco leaf temperature detection device, on the basis of thermal protection of the thermal imager through the thermal protection shell 1, supplies cooling liquid from the water inlet 21 to the heat exchange jacket 2 through the circulating chiller 3, and uses the cooling liquid to absorb heat through the heat exchange jacket 2 to cool the cavity. The cooling liquid returns to the circulating chiller 3 from the water outlet 22 to be cooled for recycling. At the same time, the temperature in the cavity and the temperature of the thermal imager are detected by the temperature measurement module to form temperature feedback to the control system. The control system controls the first pressure regulating valve 4 to adjust the pressure of the liquid in the heat exchange jacket 2 so that the steady-state temperature in the cavity meets the requirements.

[0040] The liquid supplied by the circulating chiller 3 is water. The convection heat transfer coefficient of air is an order of magnitude smaller than that of water, and the temperature of air is easily affected by the weather in different seasons, and the heat exchange effect is unstable. By supplying water for heat exchange through the circulating chiller 3, the heat exchange efficiency and heat exchange effect can be improved.

[0041] like Figure 1 、 Figure 3 As shown, the heat exchange jacket 2 is a spiral tubular structure, which is formed by bending a straight tube. Due to the existence of secondary flow in the viscous fluid performing curved motion, the spiral tube can improve the heat transfer effect relative to the straight tube. The heat exchange jacket 2 is a copper structure, which has good thermal conductivity and can quickly exchange heat.

[0042] Specifically, if Figure 1 As shown, the heat exchange sleeve 2 is embedded in the inner wall of the heat protection shell 1. The liquid in the heat exchange sleeve 2 controls the heat of the inner wall of the heat protection shell 1 to prevent the heat protection shell 1 from conducting heat into the cavity, thereby avoiding high temperature damage to the thermal imager.

[0043] like Figure 5 As shown, the control system includes an industrial control system and a display. The temperature measurement module, first pressure regulating valve 4, thermal imager, and display are each communicatively connected to the industrial control system. During operation, the thermal imager detects thermal images of the tobacco leaves and transmits them to the industrial control system for display on the display. Simultaneously, during the measurement process, the temperature measurement module detects the thermal imager temperature and the temperature inside the chamber and transmits them to the industrial control system. The industrial control system compares the acquired temperature with a preset temperature and outputs a signal to the first pressure regulating valve 4, which adjusts the liquid pressure to maintain the chamber temperature and the thermal imager temperature within an acceptable range.

[0044] Example 3

[0045] This embodiment is the third embodiment of the tobacco leaf temperature detection device. This embodiment is similar to the second embodiment, except that the heat exchange module further includes an air supply module 5 and a second pressure regulating valve 6, the heat protection shell 1 is provided with an air inlet 13 and an air outlet 14, the air inlet 13 and the air outlet 14 are connected through a cavity, the air inlet 13 is connected to the air supply module 5 through the second pressure regulating valve 6, the control system includes an industrial control system and a display, the temperature measurement module, the first pressure regulating valve 4, the second pressure regulating valve 6, the thermal imager and the display are respectively connected to the industrial control system for communication. Figure 4 、 Figure 5 shown.

[0046] The above-mentioned tobacco leaf temperature detection device, based on the thermal protection of the thermal imager through the heat protection shell 1 and the heat exchange of the heat protection shell 1 through the liquid in the heat exchange jacket 2, uses the air supply module 5 to supply gas at a certain pressure to the air inlet 13 to cool the cavity and the thermal imager therein. The gas after heat exchange is discharged from the air outlet 14. At the same time, the temperature in the cavity and the temperature of the thermal imager are detected by the temperature measurement module and the temperature is fed back to the control system to form temperature feedback. The control system controls the first pressure regulating valve 4 and the second pressure regulating valve 6 to adjust the pressure of the liquid and the pressure of the gas respectively so that the steady-state temperature in the cavity reaches the required level. At the same time, the thermal imager detects the tobacco leaf temperature and displays it on the display. In this embodiment, while regulating the temperature through gas, the heat exchange efficiency of the liquid in the heat exchange jacket 2 is further increased and the temperature unevenness in the cavity is reduced.

[0047] like Figure 4 As shown, the heat exchange module further includes a gas muffler 7, and the gas outlet 14 is communicated with the gas muffler 7 to reduce the noise of the high-pressure gas.

[0048] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A tobacco leaf temperature detection device, characterized in that: The invention comprises a thermal imager, a heat protection shell (1) and a control system, wherein the heat protection shell (1) is installed in a drying area, the heat protection shell (1) is provided with a hollow cavity, the thermal imager is installed in the cavity, a lens (12) is provided at the bottom of the heat protection shell (1), and the thermal imager is communicatively connected with the control system.

2. The tobacco leaf temperature detection device according to claim 1, characterized in that: The heat protection housing (1) is connected to a mounting bracket, and the mounting bracket is fixedly arranged in the drying area.

3. The tobacco leaf temperature detection device according to claim 1, characterized in that: The heat protection shell (1) is a polytetrafluoroethylene structure.

4. The tobacco leaf temperature detection device according to claim 1, characterized in that: The thickness of the heat protection shell (1) is 18 mm to 22 mm.

5. The tobacco leaf temperature detection device according to claim 1, characterized in that: The lens (12) is a zinc selenide lens.

6. The tobacco leaf temperature detection device according to any one of claims 1 to 5, characterized in that: The invention also includes a temperature measurement module and a heat exchange module. The temperature measurement module is installed in the cavity and is used to measure the temperature in the cavity and the temperature of the thermal imager. The heat exchange module includes a heat exchange jacket (2), a circulating chiller (3) and a first pressure regulating valve (4). The heat exchange jacket (2) is arranged in the cavity and the heat exchange jacket (2) is arranged on the periphery of the thermal imager. One end of the heat exchange jacket (2) is provided with a water inlet (21), the water inlet (21) passes through the heat protection shell (1) and is connected to one end of the circulating chiller (3) through the first pressure regulating valve (4). The other end of the heat exchange jacket (2) is provided with a water outlet (22), the water outlet (22) passes through the heat protection shell (1) and is connected to the other end of the circulating chiller (3). The temperature measurement module and the first pressure regulating valve (4) are respectively connected to the control system for communication.

7. The tobacco leaf temperature detection device according to claim 6, characterized in that: The heat exchange jacket (2) is a spiral tubular structure.

8. The tobacco leaf temperature detection device according to claim 6, characterized in that: The heat exchange module further comprises an air supply module (5) and a second pressure regulating valve (6); the heat protection housing (1) is provided with an air inlet (13) and an air outlet (14); the air inlet (13) and the air outlet (14) are communicated through the cavity; the air inlet (13) is communicated with the air supply module (5) through the second pressure regulating valve (6); and the second pressure regulating valve (6) is communicatively connected with the control system.

9. The tobacco leaf temperature detection device according to claim 8, characterized in that: The heat exchange module further comprises a gas silencer (7), and the gas outlet (14) is in communication with the gas silencer (7).

10. The tobacco leaf temperature detection device according to claim 8, characterized in that: The control system comprises an industrial control system and a display, and the temperature measurement module, the first pressure regulating valve (4), the second pressure regulating valve (6), the thermal imager and the display are respectively connected to the industrial control system for communication.

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