Grain temperature, humidity and water sensor and grain temperature, humidity and water online monitoring system

Abstract

The present invention discloses a grain temperature, humidity, and moisture sensor and an online grain temperature, humidity, and moisture monitoring system. The grain temperature, humidity, and moisture sensor comprises: a first capacitor plate, the first capacitor plate having an annular cross-section and a first notch formed circumferentially; a second capacitor plate, the second capacitor plate having an annular cross-section and a second notch formed circumferentially; a base column, the first and second capacitor plates being coaxially sleeved on the outer circumference of the base column; and a capacitance detection module, the capacitance detection module being disposed within the base column and electrically connected to the first and second capacitor plates. The present invention solves the problems of humidity sensors in the prior art, such as the difficulty in applying them and the difficulty in ensuring measurement accuracy.

Description

Technical Field

[0001] The present invention relates to the field of granary storage, and in particular to a grain temperature, humidity and moisture sensor and a grain temperature, humidity and moisture online monitoring system. Background Art

[0002] Grain stored in a closed space for extended periods of time inevitably heats up during storage due to the grain's internal respiration and poor heat dissipation. Furthermore, grain piles are porous and highly hygroscopic, so rising humidity levels inevitably lead to grain mold. Therefore, monitoring the temperature and humidity of stored grain is an essential component of grain storage management.

[0003] Application No. 201710991449.2 provides a humidity sensor, including a lining plate, a humidity sensitive unit, and a temperature sensitive unit. The lining plate is provided with a temperature sensitive unit, and the humidity sensitive unit is located above the temperature sensitive unit; a heat-conducting medium is provided between the temperature sensitive unit and the humidity sensitive unit; the temperature sensitive unit and the humidity sensitive unit are respectively fixed to the lining plate by welding pads, and the humidity sensitive unit includes an upper electrode, a lower electrode, and a humidity-sensing medium between the upper and lower electrodes. In the above technical solution, the capacitor plates in the humidity measurement sensitive unit are symmetrical plate-shaped structures. When detecting capacitance, the electrostatic field is distributed inside the sensor. The object to be measured needs to be placed between the capacitor plates in order to detect the humidity of the object to be measured, which is relatively inconvenient to use. Since the object to be measured needs to be placed between the capacitor plates, it is easy to contact the capacitor plates during the detection process, which seriously affects the size of the capacitance value, causing inaccurate humidity measurement, and difficult to ensure measurement accuracy.

[0004] Application No. 201810109884.2 provides a soil moisture detection device. The capacitor plates in the humidity detection device are also symmetrical plate structures. During the detection process, there are also problems such as high application difficulty and difficulty in ensuring measurement accuracy. Summary of the Invention

[0005] In response to the problems existing in the prior art, the purpose of the present invention is to provide a grain temperature, humidity and water sensor and a grain temperature, humidity and water online monitoring system to solve the problems in the prior art that grain temperature, humidity and water sensors are difficult to apply and difficult to ensure measurement accuracy.

[0006] To achieve the above-mentioned objectives, the present invention provides a grain temperature, humidity and water sensor, comprising: a first capacitor plate, the cross-section of the first capacitor plate is annular, and the first capacitor plate is provided with a first notch along the circumferential direction; a second capacitor plate, the cross-section of the second capacitor plate is annular, and the second capacitor plate is provided with a second notch along the circumferential direction; a base column, the first capacitor plate and the second capacitor plate are coaxially sleeved on the outer circumferential surface of the base column; and a capacitance detection module, the capacitance detection module is arranged in the base column, and the capacitance detection module is electrically connected to the first capacitor plate and the second capacitor plate.

[0007] Furthermore, the grain temperature, humidity and water sensor also includes a temperature sensor, which is arranged in the base column.

[0008] Furthermore, the length of the first capacitor plate along the axial direction is H1, 5mm≤H1≤200mm, and / or the length of the second capacitor plate along the axial direction is H2, 5mm≤H2≤200mm.

[0009] Furthermore, the distance between the first capacitor plate and the second capacitor plate is X, 1 mm ≤ X ≤ 20 mm.

[0010] Furthermore, the radius of the first capacitor plate is Y1, 2.5 mm ≤ Y1 ≤ 10 mm, and / or the radius of the second capacitor plate is Y2, 2.5 mm ≤ Y2 ≤ 10 mm.

[0011] Furthermore, it is characterized in that the angle between the first notch and the second notch along the circumferential direction of the first capacitor plate is 120 0 .

[0012] Furthermore, the central angle of the first notch is a1,30 0 ≤a1≤180 0 , and or the central angle of the second notch is a2,30 0 ≤a2≤180 0 .

[0013] Furthermore, the thickness of the first capacitor plate is b1, b1=1 mm, and / or the thickness of the second capacitor plate is b2, b2=1 mm.

[0014] The present invention provides an online monitoring system for grain temperature, humidity and water, including the above-mentioned grain temperature, humidity and water sensor. The online monitoring system for grain temperature, humidity and water sensor also includes: at least one injection molding cylinder, multiple grain temperature, humidity and water sensors are arranged in the injection molding cylinder at intervals along the axial direction of the injection molding cylinder, and the injection molding cylinders are inserted into the granary at intervals; an industrial control host, multiple grain temperature, humidity and water sensors in each injection molding cylinder are electrically connected to the industrial control host; a data processing device, the data processing device is electrically connected to the industrial control host; and a user terminal, the user terminal is electrically connected to the data processing device.

[0015] The grain temperature, humidity and water sensor provided by the present invention has a first capacitor plate with an annular cross-section and a first notch provided in the circumferential direction, and a second capacitor plate with an annular cross-section and a second notch provided in the circumferential direction. The first capacitor plate and the second capacitor plate are coaxially sleeved on the outer peripheral surface of the base column. Under the action of the capacitor detection module, the grain temperature, humidity and water sensor generates an annular electrostatic field radiating to the periphery. The electrostatic field is not highly sensitive to grains and air, but highly sensitive to moisture. The humidity of the grains can be determined by detecting the change in capacitance. When the object to be measured is in the annular electrostatic field of the grain temperature, humidity and water sensor, its humidity can be detected without placing the object to be measured between the capacitor plates, thereby improving the convenience of humidity detection. During the detection process, the object to be measured is not likely to contact the capacitor plates, and the accuracy of the measurement is also easy to ensure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a three-dimensional schematic diagram of a grain temperature, humidity and water sensor according to the first embodiment of the present invention;

[0017] Figure 2 for Figure 1 A top view schematic diagram of the grain temperature, humidity and water sensor;

[0018] Figure 3 for Figure 1 A bottom-up schematic diagram of the grain temperature, humidity and water sensor;

[0019] Figure 4 for Figure 1 The structural principle diagram of the capacitance detection module in FIG;

[0020] Figure 5 Schematic diagram of the structure of the grain temperature, humidity and water online monitoring system in Example 1 of the present invention;

[0021] Figure 6 for Figure 1 Experimental test diagram of the grain temperature, humidity and water sensor of Example 1;

[0022] Figure 7 This is an experimental test diagram of the grain temperature, humidity and water sensor according to Example 2 of the present invention;

[0023] Figure 8 This is an experimental test diagram of the grain temperature, humidity and water sensor according to Example 3 of the present invention;

[0024] Figure 9 This is an experimental test diagram of the grain temperature, humidity and water sensor according to the fourth embodiment of the present invention;

[0025] Figure 10 This is an experimental test diagram of the grain temperature, humidity and water sensor according to Example 5 of the present invention;

[0026] Figure 11This is an experimental test diagram of the grain temperature, humidity and water sensor according to Example 6 of the present invention;

[0027] In the figure: 10, grain temperature, humidity and water sensor; 11, first capacitor plate; 111, first notch; 112, center line of first notch; 12, second capacitor plate; 121, second notch; 122, center line of second notch; 13, base column; 14, capacitance detection module; 15, temperature sensor; 16, electric field lines; 20, injection molding cylinder; 30, granary; 40, bus. DETAILED DESCRIPTION

[0028] In order to clearly illustrate the design concept of the present invention, the present invention is described below with reference to examples.

[0029] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the drawings in the examples of the present invention. Obviously, the examples described are only part of the examples of the present invention, not all of the examples. Based on the examples of the present invention, all other implementation methods obtained by those skilled in the art without making any creative work should fall within the scope of protection of the present invention.

[0030] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely to distinguish similar objects and are not to be construed as implying a specific order or precedence. It should be understood that such terms are interchangeable where appropriate.

[0031] The present invention provides a grain temperature, humidity and moisture sensor and a grain temperature, humidity and moisture sensor online monitoring system, which solves the problems in the prior art that humidity sensors are difficult to apply and difficult to ensure measurement accuracy.

[0032] Example 1

[0033] like Figures 1 to 3As shown, the grain temperature, humidity and water sensor 10 includes a first capacitor plate 11, a second capacitor plate 12, a base column 13, and a capacitor detection module 14. The cross-section of the first capacitor plate 11 is annular, and the first capacitor plate 11 is provided with a first notch 111 along the circumferential direction; the cross-section of the second capacitor plate 12 is annular, and the second capacitor plate 12 is provided with a second notch 121 along the circumferential direction; the first capacitor plate 11 and the second capacitor plate 12 are coaxially sleeved on the outer circumferential surface of the base column 13; the capacitor detection module 14 is arranged in the base column 13, and the capacitor detection module 14 is electrically connected to the first capacitor plate 11 and the second capacitor plate 12.

[0034] The cross section of the first capacitor plate 11 is annular, with a first notch 111 provided along the circumference; the cross section of the second capacitor plate 12 is annular, with a second notch 121 provided along the circumference; the first capacitor plate 11 and the second capacitor plate 12 are coaxially sleeved on the outer peripheral surface of the base column 13. Under the action of the capacitor detection module 14, the grain temperature, humidity and water sensor 10 generates an annular electrostatic field radiating to the periphery. The electrostatic field is not very sensitive to grains and air, but is very sensitive to moisture. The humidity of the grains can be determined by detecting the change in capacitance. When the object to be measured is in the annular electrostatic field of the grain temperature, humidity and water sensor 10, its humidity can be detected without placing the object to be measured between the capacitor plates, thereby improving the convenience of humidity detection. During the detection process, the object to be measured is not easy to contact the capacitor plates, and the accuracy of the measurement is also easy to ensure.

[0035] In this embodiment, the base column 13 is cylindrical in shape, and the capacitance detection module 14 is disposed inside the base column 13. The measurement leads at both ends of the capacitance detection module 14 extend from the base column 13 and are fixed to the first capacitor plate 11 and the second capacitor plate 12 respectively by soldering. Figure 4 As shown, the capacitor C1 to be measured corresponds to the first capacitor plate 11 and the second capacitor plate 12 in this embodiment, the resistance values ​​of the resistors R1 and R2 are fixed, and the capacity value of the capacitor C2 is fixed. The value of C1 can be obtained according to the frequency and duty cycle of the 555 timer.

[0036] like Figure 1 As shown, in this embodiment, the electric field lines 16 of the annular electrostatic field generated by the grain temperature, humidity and moisture sensor 10 are in a ring shape radiating to the periphery. When the object to be measured is in the annular electrostatic field of the grain temperature, humidity and moisture sensor 10, its humidity can be detected.

[0037] like Figure 1 As shown, the grain temperature, humidity and moisture sensor 10 also includes a temperature sensor 15, which is disposed within the base column 13. Placing the temperature sensor 15 within the base column 13 enables unified collection of grain temperature and humidity, thereby improving detection efficiency. In this embodiment, the temperature sensor 15 is a non-contact sensor, specifically a digital temperature sensor DS18B20.

[0038] like Figure 1 As shown, the axial length of the first capacitor plate 11 is H1, 5mm≤H1≤200mm, and the axial length of the second capacitor plate 12 is H2, 5mm≤H2≤200mm. In this embodiment, H1 corresponds to the height of the first capacitor plate 11, and H2 corresponds to the height of the second capacitor plate 12, where the heights of H1 and H2 are 100mm.

[0039] like Figure 1 As shown, the distance between the first capacitor plate 11 and the second capacitor plate 12 is X, 1mm≤X≤20mm. In this embodiment, X is 8mm.

[0040] like Figure 2 and Figure 3 As shown, the radius of the first capacitor plate 11 is Y1, 2.5 mm ≤ Y1 ≤ 10 mm, and the radius of the second capacitor plate 12 is Y2, 2.5 mm ≤ Y2 ≤ 10 mm. In this embodiment, the values ​​of Y1 and Y2 are both 4.25 mm.

[0041] like Figure 2 and Figure 3 As shown, the central angle of the first notch 111 is a1,30 0 ≤a1≤180 0 , and or the central angle of the second notch 121 is a2,30 0 ≤a2≤180 0 In this embodiment, the values ​​of a1 and a2 are both 45 0 .

[0042] like Figure 2 and Figure 3 As shown, the angle between the first notch 111 and the second notch 121 along the circumferential direction of the first capacitor plate 11 is 120 0 Specifically, the line connecting the center of the first notch 111 along the circumference of the first capacitor plate 11 and the center of the first capacitor plate 11 is the first notch centerline 112, and the line connecting the center of the second notch 121 along the circumference of the second capacitor plate 12 and the center of the second capacitor plate 12 is the second notch centerline 122. Figure 2 As shown, the angle between the first notch centerline 112 and the second notch centerline 122 is 120 0 .

[0043] like Figure 2 and Figure 3 As shown, the thickness of the first capacitor plate 11 is b1, b1=1 mm, and the thickness of the second capacitor plate 12 is b2, b2=1 mm.

[0044] As shown in Table 1, in order to detect the performance parameters of the grain temperature, humidity and water sensor 10 in this embodiment, the grain temperature, humidity and water sensor 10 is buried in wheat grains, and tap water is added to the wheat grains using an atomizer. The parameter values, water addition amount, and sensor capacitance value of the grain temperature, humidity and water sensor 10 are shown in Table 1.

[0045]

[0046] Table 1

[0047] like Figure 6 As shown in the table above, the amount of water added and the capacitance value of the detected sensor are plotted as a line graph. Figure 5 From the line graph, we can see that there is an approximate linear relationship between the amount of water added and the sensor capacitance value. The sensor under this parameter has good sensitivity and stability.

[0048] like Figure 5 As shown, the grain temperature, humidity and water online monitoring system includes the above-mentioned grain temperature, humidity and water sensor 10, at least one injection molding cylinder 20, an industrial control host, a data processing device, and a user terminal. Multiple grain temperature, humidity and water sensors 10 are arranged in the injection molding cylinder 20 at intervals along the axial direction of the injection molding cylinder 20, and the injection molding cylinder 20 is inserted into the granary 30 at intervals; the multiple grain temperature, humidity and water sensors 10 in each injection molding cylinder 20 are electrically connected to the industrial control host; the data processing device is electrically connected to the industrial control host; and the user terminal is electrically connected to the data processing device.

[0049] In this embodiment, multiple grain temperature, humidity and water sensors 10 are arranged in the injection molding cylinder 20 through a closed injection molding process, which improves the service life of the grain temperature, humidity and water sensors 10. During the detection process, it can also prevent grains from contacting the capacitor plates in the grain temperature, humidity and water sensors 10, thereby ensuring the measurement accuracy.

[0050] The specific number of grain temperature, humidity and water sensors 10 can be selected according to the depth of the granary 30, and the number of injection cylinders 20 can be selected and set according to the length and width of the granary 30. During the detection process, the injection cylinder 20 is completely immersed in the granary 30, and the industrial control host is electrically connected to the grain temperature, humidity and water sensors 10 in the injection cylinder 20 through the bus 40. The arrangement of the grain temperature, humidity and water sensors 10 and the injection cylinder 20 can perform multi-point measurements of the temperature and humidity at various positions in the granary 30. In engineering applications, compensation can be established for different grain pile depths and grain varieties, and modeling can be performed according to actual needs to calculate the moisture value of a single point or multiple points inside the granary, such as the grain moisture value inside the granary based on temperature and humidity monitoring provided by Patent No. 201410265035.8.

[0051] Example 2

[0052] The difference between this embodiment and the first embodiment is that the structural parameters of the grain temperature, humidity and water sensor 10 are different, wherein the angle between the first notch center line 112 and the second notch center line 122 is 120 0 , as shown in Table 2, corresponding to Figure 7 The line chart in Figure 7 It can be seen that there is an approximate linear relationship between the amount of water added and the sensor capacitance value. The sensor under this parameter has good sensitivity and stability.

[0053]

[0054] Table 2

[0055] Example 3

[0056] The difference between this embodiment and the first embodiment is that the structural parameters of the grain temperature, humidity and water sensor 10 are different, wherein the angle between the first notch center line 112 and the second notch center line 122 is 120 0 , as shown in Table 3, corresponding to Figure 8 The line chart in Figure 8 It can be seen that there is an approximate linear relationship between the amount of water added and the sensor capacitance value. The sensor under this parameter has good sensitivity and stability.

[0057]

[0058] Table 3

[0059] Example 4

[0060] The difference between this embodiment and the first embodiment is that the structural parameters of the grain temperature, humidity and water sensor 10 are different, wherein the angle between the first notch center line 112 and the second notch center line 122 is 120 0 , as shown in Table 4, corresponding to Figure 9 The line chart in Figure 9 It can be seen that there is an approximate linear relationship between the amount of water added and the sensor capacitance value. The sensor under this parameter has good sensitivity and stability.

[0061]

[0062] Table 4

[0063] Example 5

[0064] The difference between this embodiment and the first embodiment is that the structural parameters of the grain temperature, humidity and water sensor 10 are different, wherein the angle between the first notch center line 112 and the second notch center line 122 is 120 0 , as shown in Table 5, corresponding to Figure 10 The line chart in Figure 10It can be seen that there is an approximate linear relationship between the amount of water added and the sensor capacitance value. The sensor under this parameter has good sensitivity and stability.

[0065]

[0066] Table 5

[0067] Example 6

[0068] The difference between this embodiment and the first embodiment is that the structural parameters of the grain temperature, humidity and water sensor 10 are different, wherein the angle between the first notch center line 112 and the second notch center line 122 is 120 0 , as shown in Table 6, corresponding to Figure 11 The line chart in Figure 11 It can be seen that there is an approximate linear relationship between the amount of water added and the sensor capacitance value. The sensor under this parameter has good sensitivity and stability.

[0069]

[0070] Table 6

[0071] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0072] Finally, it should be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will be able to make various modifications and improvements without departing from the principles and essence of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A grain temperature, humidity and water sensor, characterized in that: include: A first capacitor plate (11), wherein the cross section of the first capacitor plate (11) is annular, and the first capacitor plate (11) is provided with a first notch (111) along the circumferential direction; A second capacitor plate (12), wherein the cross section of the second capacitor plate (12) is annular, and the second capacitor plate (12) is provided with a second notch (121) along the circumferential direction; There is only one pair of capacitor plates consisting of the first capacitor plate (11) and the second capacitor plate (12); A base column (13), wherein the first capacitor plate (11) and the second capacitor plate (12) are coaxially sleeved on the outer peripheral surface of the base column (13); a capacitance detection module (14), the capacitance detection module (14) being electrically connected to the first capacitor plate (11) and the second capacitor plate (12), and the capacitance detection module (14) being disposed within the base column (13); The angle between the first notch (111) and the second notch (121) along the circumferential direction of the first capacitor plate (11) is 120°; The central angle of the circle subtended by the first notch (111) is a1, 30°≤ a1≤ 180°, and or the central angle of the circle subtended by the second notch (121) is a2, 30°≤ a2≤ 180°.

2. The grain temperature, humidity and water sensor according to claim 1, characterized in that: The grain temperature, humidity and water sensor further comprises a temperature sensor (15), and the temperature sensor (15) is arranged in the base column (13).

3. The grain temperature, humidity and water sensor according to claim 1, characterized in that: The length of the first capacitor plate (11) along the axial direction is H1,5 mm ≤ H1≤ 200 mm , and or the length of the second capacitor plate (12) along the axial direction is H 2， 5 mm ≤ H2≤ 200 mm .

4. The grain temperature, humidity and water sensor according to claim 1, characterized in that: The distance between the first capacitor plate (11) and the second capacitor plate (12) is X, 1 mm ≤ X ≤ 20 mm .

5. The grain temperature, humidity and water sensor according to claim 1, characterized in that: The radius of the first capacitor plate (11) is Y1, 2.5 mm ≤Y1≤10 mm , and or the radius of the second capacitor plate (12) is Y2, 2.5 mm ≤ Y2≤ 10 mm .

6. The grain temperature, humidity and water sensor according to claim 1, characterized in that: The thickness of the first capacitor plate (11) is b1, b1= 1 mm, and or the thickness of the second capacitor plate (12) is b2, b2= 1 mm .

7. A grain temperature, humidity and water online monitoring system, characterized in that: The grain temperature, humidity and water sensor (10) according to any one of claims 1 to 6 is included, and the grain temperature, humidity and water online monitoring system further comprises: At least one injection molding cylinder (20), a plurality of grain temperature, humidity and water sensors (10) are arranged in the injection molding cylinder (20) at intervals along the axial direction of the injection molding cylinder (20), and the injection molding cylinder (20) is inserted into the granary (30) at intervals; An industrial control host, wherein the plurality of grain temperature, humidity and water sensors (10) in each of the injection molding cylinders (20) are electrically connected to the industrial control host; A data processing device, the data processing device being electrically connected to the industrial control host; A user terminal is electrically connected to the data processing device.

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