Plane type grain moisture content sensor

Abstract

The utility model discloses a plane type grain moisture content sensor, which belongs to the technical field of grain moisture content detection and comprises a mounting plate, a through hole is arranged on the mounting plate, an insulator is arranged in the through hole, an excitation electrode and a response electrode are embedded at one end of the insulator, and the excitation electrode and the response electrode are separated by the insulator; a shielding electrode is arranged at one end, far away from the excitation electrode and the response electrode, of the insulator and mounted on the mounting plate to cover the through hole; a first joint and a second joint are arranged on the shielding electrode; the first connector penetrates through the shielding electrode to be connected with the exciting electrode, and the second connector penetrates through the shielding electrode to be connected with the response electrode. The grain moisture content sensor provided by the utility model is conveniently mounted on one side of a grain flow channel so as to conveniently measure flowing grains, a circular electric field formed by the excitation electrode and the response electrode is more concentrated and uniform, and external signal interference can be reduced by matching with the integrated shielding electrode; therefore, the measurement of the water content of the flowing type grain is more accurate and efficient.

Description

Technical Field

[0001] The utility model belongs to the technical field of grain moisture content measurement, and in particular relates to a plane grain moisture content sensor. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] The moisture content of grain is an important parameter for evaluating its quality. If the moisture content is too high, it is easy to cause problems such as mold, sprouting and insect pests, which will affect the quality and storage period of the grain. Therefore, the moisture content of the grain needs to be monitored during the processing and storage process to ensure the quality and safety of the grain.

[0004] A common method for measuring grain moisture content is oven drying. This involves heating and drying a sample and measuring the weight difference before and after heating to calculate the moisture content. This method is complex, time-consuming, and labor-intensive. While infrared methods offer non-contact measurement, they cannot measure the moisture content within the grain because the reflected wave only reflects the surface moisture content. Furthermore, many substances in the environment can emit infrared radiation, making this method susceptible to interference during measurement. Neither method can accurately measure the moisture content of grain while it is flowing.

[0005] At present, a moisture meter is also used to measure the moisture content of grains, which includes inserting the meter probe into the grain flow channel to measure the moisture content of the grain. However, this method requires that the length of the probe be consistent with the cross-sectional area length of the flow channel, and the installation position has relatively strict correspondence requirements with the grain flow direction, which makes installation inconvenient. In addition, some meters install the transmitter and the receiver of the measurement signal on both sides of the flow channel, which is also more complicated to install. At the same time, if the positions of the transmitter and the receiver of the measurement signal are not accurately matched, it will also affect the measurement results of the grain moisture content. Utility Model Content

[0006] The purpose of this utility model is to provide a planar grain moisture content sensor. A new type of grain moisture content sensor is designed based on the AC excitation impedance method. Compared with methods of measuring grain moisture content such as dielectric parameters, the calculation complexity of the measurement results can be reduced. At the same time, the planar structure makes it convenient to be installed on one side of the grain flow channel to facilitate the measurement of flowing grains. The circular electric field formed by the excitation electrode and the response electrode is more concentrated and uniform. The integrated shielding electrode can reduce external signal interference, making the measurement of the moisture content of flowing grains more accurate and efficient.

[0007] In order to achieve the above purpose, the present invention is implemented through the following technical solutions:

[0008] In a first aspect, an embodiment of the present utility model provides a planar grain moisture content sensor, comprising a mounting plate, a through hole being provided on the mounting plate, an insulator being provided in the through hole, an excitation electrode and a response electrode being embedded at one end of the insulator, and the excitation electrode and the response electrode being separated by the insulator;

[0009] The insulator is provided with a shielding electrode at one end away from the excitation electrode and the response electrode, which is mounted on the mounting plate and covers the insulator. The shielding electrode is provided with a first connector and a second connector; the first connector passes through the shielding electrode to connect to the excitation electrode, and the second connector passes through the shielding electrode to connect to the response electrode.

[0010] As a further technical solution, a temperature sensor mounting hole is provided on the mounting plate.

[0011] As a further technical solution, sensor mounting holes are provided at the four corners of the mounting plate.

[0012] As a further technical solution, the plane of the insulator where the excitation electrode and the response electrode are located is parallel to the grain flow direction and is not higher than the surface of the mounting plate.

[0013] As a further technical solution, the insulator is configured as a cylindrical structure, the shielding electrode is configured as an integrated cylindrical shell structure, and the shielding electrode is covered on the outside of the insulator and installed on one side of the mounting plate.

[0014] As a further technical solution, the first joint and the second joint are arranged on the circular end surface of the shielding electrode of the cylindrical shell away from the mounting plate.

[0015] As a further technical solution, the shielding electrode is detachably mounted on the mounting plate by means of mounting bolts, and the shielding electrode and the insulator are mounted together by means of fixing bolts.

[0016] As a further technical solution, the diameter of the circular end surface of the insulator is consistent with the diameter of the through hole.

[0017] As a further technical solution, the response electrode is configured as a circular ring structure embedded in the circular end face of the insulator, the outer diameter of the circular ring structure is smaller than the diameter of the insulator, and the response electrode is concentrically arranged with the center of the insulator.

[0018] As a further technical solution, the excitation electrode is configured as a circular plate structure with a diameter smaller than the inner diameter of the response electrode ring structure and is embedded in the circular end face of the insulator. The excitation electrode is concentrically arranged with the center of the insulator.

[0019] The beneficial effects of the above embodiments of the present invention are as follows:

[0020] The utility model provides a planar grain moisture content sensor, which is a new type of grain moisture content sensor designed based on the AC excitation impedance method. The measurement module connected to the sensor obtains grain AC impedance data by measuring the amplitude attenuation and phase shift of the impedance response signal, and measures the grain moisture content by coupling the grain temperature. Compared with methods of measuring grain moisture content such as dielectric parameters, the calculation complexity of the measurement results can be reduced. At the same time, the planar structure setting makes it convenient to be installed on one side of the grain flow channel to facilitate the measurement of flowing grains, and the circular electric field formed by the set excitation electrode and response electrode is more concentrated and uniform. The integrated shielding electrode set in conjunction can reduce external signal interference, making the measurement of the flowing grain moisture content more accurate and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0022] Figure 1 This is a schematic diagram of the overall structure of a planar grain moisture sensor provided by Example 1 of the present utility model. Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the overall structure of a planar grain moisture sensor provided by Example 1 of the present utility model. Figure 2 ;

[0024] Figure 3 This is a schematic diagram of the front structure of a planar grain moisture sensor provided by Example 1 of the present utility model;

[0025] Figure 4 This is a side structural diagram of a planar grain moisture sensor provided by Example 1 of the present utility model;

[0026] Figure 5 This is a schematic diagram of the rear structure of a planar grain moisture sensor provided in Example 1 of the present utility model;

[0027] Figure 6 This is a schematic diagram of the insulator structure provided by Example 1 of the present utility model;

[0028] Figure 7 This is a schematic diagram of the shielding electrode structure provided in Example 1 of the present utility model;

[0029] Figure 8 This is a schematic diagram of the mounting plate structure provided in Example 1 of the present utility model;

[0030] Figure 9This is a schematic diagram of the excitation electrode structure provided in Example 1 of the present utility model;

[0031] Figure 10 This is a schematic diagram of the response electrode structure provided in Example 1 of the present utility model.

[0032] The diagram is for illustrative purposes only;

[0033] Among them, 1. Mounting plate; 2. Mounting bolts; 3. Fixing bolts; 4. Shielding electrode; 5. First connector; 6. Second connector; 7. Temperature sensor mounting hole; 8. Sensor mounting hole; 9. Insulator; 10. Excitation electrode; 11. Response electrode. DETAILED DESCRIPTION

[0034] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0035] Example 1

[0036] In the prior art, when measuring the moisture content of grains, a moisture meter with a probe needs to insert the probe into the grain flow channel to measure the moisture content of the grains. However, this method requires that the length of the probe be consistent with the cross-sectional area of ​​the flow channel, and the installation position has strict requirements on the correspondence between the installation position and the grain flow direction, which makes installation inconvenient.

[0037] In addition, some measuring instruments install the transmitter and receiver of the measurement signal on both sides of the flow channel, which makes the installation more complicated. At the same time, if the positions of the transmitter and receiver of the measurement signal do not correspond accurately, it will also affect the measurement results of the grain moisture content.

[0038] To this end, the utility model provides a planar grain moisture content sensor based on the AC excitation impedance method. The advantage of the AC excitation impedance method is that the measurement module obtains the grain AC impedance data by measuring the amplitude attenuation and phase shift of the impedance response signal, and measures the grain moisture content by coupling the grain temperature. Compared with methods such as dielectric parameters for measuring grain moisture content, this method can reduce the complexity of calculation, thereby improving the measurement efficiency while ensuring the accuracy of the grain moisture content measurement results.

[0039] The planar grain moisture content sensor designed and provided by the utility model is installed on one side of the grain flow channel with the installation surface parallel to the plane of the grain flow direction. This not only avoids the inconvenience of installation caused by the need to insert the probe of a probe-type measuring instrument into the grain flow channel, but also does not require the corresponding arrangement of a measurement signal transmitter and a measurement signal receiver on both sides of the grain flow channel. While ensuring the accuracy of the measurement results, it is also more convenient to install and use.

[0040] In a typical embodiment of the present invention, Figure 1-5 As shown, a planar grain moisture sensor is provided, comprising a mounting plate 1, a through hole being provided on the mounting plate 1, an insulator 9 being provided in the through hole, an excitation electrode 10 and a response electrode 11 being embedded at one end of the insulator 9, and the excitation electrode 10 and the response electrode 11 being separated by the insulator 9;

[0041] A shielding electrode 4 is provided at one end of the insulator 9 away from the excitation electrode 10 and the response electrode 11 and is mounted on the mounting plate 1 to cover the insulator. A first connector 5 and a second connector 6 are provided on the shielding electrode 4; the first connector 5 passes through the shielding electrode 4 to connect to the excitation electrode 10, and the second connector 6 passes through the shielding electrode 4 to connect to the response electrode 11.

[0042] In this embodiment, the size of the mounting plate 1 can be set according to actual needs. The mounting plate 1 can be set on one side of the grain flow channel, and the mounting surface of the excitation electrode 10 and the response electrode 11 is close to the grain flow channel and parallel to the plane of the grain flow direction. A shielding electrode 4 is provided on the side of the insulator 9 away from the excitation electrode 10 and the response electrode 11. It is installed on the mounting plate 1 and covers the insulator 9, which can reduce the influence of external interference. The circular electric field area formed by the excitation electrode 10 and the response electrode 11 has a wide coverage and is relatively concentrated and uniform. Compared with the rectangular electric field or other shaped electric fields, it has no sharp corners, which can further reduce the interference of external signals.

[0043] Furthermore, a temperature sensor mounting hole 7 is provided on the mounting plate 1. In this embodiment, the mounting plate 1 below the shielding electrode 4 is provided with a temperature sensor mounting hole 7 for mounting a temperature sensor, which is used to measure the grain temperature. With this arrangement, the measurement module connected to the sensor obtains grain AC impedance data by measuring the amplitude attenuation and phase shift of the impedance response signal, and couples the grain temperature to measure the grain moisture content.

[0044] Furthermore, sensor mounting holes 8 are provided at the four corners of the mounting plate 1 for mounting the sensor on one side of the grain flow channel.

[0045] Furthermore, the plane of the insulator 9 where the excitation electrode 10 and the response electrode 11 are located is parallel to the grain flow direction and is not higher than the surface of the mounting plate 1. This arrangement allows for better contact with the flowing grain, better ensuring the accuracy of the grain moisture content measurement results. It is also more convenient to install and measure compared to meters that require measurement signal transmitters and receivers to be installed on both sides of the grain flow path.

[0046] Furthermore, the insulator 9 is configured as a cylindrical structure, and the shielding electrode 4 is configured as an integrated cylindrical shell structure. The shielding electrode 4 covers the exterior of the insulator 9 and is mounted on one side of the mounting plate 1. In this embodiment, the shielding electrode 4 is configured as an integrated cylindrical shell structure made of 316L stainless steel. The cylindrical shell structure covers the insulator 9 and is mounted on one side of the mounting plate 1 to better ensure good electromagnetic shielding and reduce interference from other factors on the measurement results. Furthermore, a ring-shaped strip structure is provided at the point where the shielding electrode 4 contacts the mounting plate 1, which facilitates installation of the shielding electrode 4 and the mounting plate 1 and ensures a certain degree of sealing.

[0047] In this embodiment, four fixing bolts 3 are provided on the cylindrical side of the shielding electrode 4 of the integrated cylindrical shell structure, and the shielding electrode 4 of the integrated cylindrical shell structure is connected to the insulator 9 inside it by the fixing bolts 3 to ensure the stability of the assembly of the two.

[0048] Furthermore, the first connector 5 and the second connector 6 are provided on the circular end surface of the cylindrical structure away from the mounting plate 1. In this embodiment, the first connector 5 and the second connector 6 are both SMA connectors, wherein the first connector 5 is provided near the center of the shielding electrode 4, passes through the shielding electrode 4, and its inner core is connected to the excitation electrode 10, and the second connector 6 is provided at a position of the shielding electrode 4 corresponding to the response electrode 11, passes through the shielding electrode 4, and its inner core is connected to the response electrode 11.

[0049] Furthermore, the shielding electrode 4 is detachably mounted on the mounting plate 1 via mounting bolts 2. In this embodiment, an annular strip structure is provided on the outer side of the circular end surface where the shielding electrode 4 connects to the mounting plate 1, abutting the mounting plate 1 to further ensure that the shielding electrode 4 can achieve good electromagnetic shielding. At the same time, two arc-shaped protrusions are provided at the upper and lower opposite ends of the annular strip structure, each of which is provided with a mounting bolt 2 to detachably mount the shielding electrode 4 on the mounting plate 1.

[0050] Furthermore, insulator 9 is configured as a cylindrical structure, with a diameter consistent with the diameter of the through-hole. In this embodiment, insulator 9 is made of ultra-high molecular weight polyethylene (UHMWPE), which offers excellent wear resistance and extends the sensor's service life. Furthermore, the consistent diameter of insulator 9 ensures a tight connection between insulator 9 and mounting plate 1.

[0051] Furthermore, the response electrode 11 is configured as a ring structure embedded in the circular end face of the insulator 9. The outer diameter of the ring structure is smaller than the diameter of the insulator 9. The response electrode 11 is concentric with the center of the insulator 9. In this embodiment, the response electrode 11 is made of 316L stainless steel.

[0052] Furthermore, the excitation electrode 10 is configured as a circular plate having a diameter smaller than the inner diameter of the ring structure of the response electrode 11 and is embedded in the circular end face of the insulator 9. The excitation electrode 10 is concentric with the center of the insulator 9. In this embodiment, the excitation electrode 10 is made of 316L stainless steel.

[0053] Through the above-mentioned structural setting, the circular electric field area formed by the excitation electrode 10 and the response electrode 11 has a wide coverage and is relatively concentrated and uniform. Compared with the rectangular electric field, it has no sharp corners, which can further reduce the interference of external signals.

[0054] The working principle of the planar grain moisture sensor provided by the utility model is as follows:

[0055] The planar grain moisture content sensor uses the AC excitation impedance method to measure the AC impedance of grains. That is, the grain is taken as the measurement object and an AC signal excitation is applied to it. The excitation signal is transmitted to the circular plate-shaped 316L stainless steel excitation electrode 10 via the first connector 5. The grain AC impedance response signal measured by the circular ring-shaped 316L stainless steel response electrode 11 is transmitted to the externally connected measurement module via the second connector 6. The measurement module obtains the grain AC impedance data by measuring the amplitude attenuation and phase shift of the impedance response signal, and measures the grain moisture content by coupling it with the grain temperature.

[0056] The utility model provides a planar grain moisture content sensor, which is a new type of grain moisture content sensor designed based on the AC excitation impedance method. The measurement module connected to the sensor obtains grain AC impedance data by measuring the amplitude attenuation and phase shift of the impedance response signal, and measures the grain moisture content by coupling the grain temperature. Compared with the method of measuring grain moisture content by dielectric parameters, the calculation complexity of the measurement results can be reduced. At the same time, the planar structure setting makes it convenient to be installed on one side of the grain flow channel to facilitate the measurement of flowing grains, and the circular electric field formed by the set excitation electrode 10 and the response electrode 11 is more concentrated and uniform, and the shielding electrode 4 set in conjunction can reduce external signal interference, making the measurement of the flowing grain moisture content more accurate and efficient.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A planar grain moisture sensor, characterized in that: The device comprises a mounting plate, wherein a through hole is provided on the mounting plate, an insulator is provided in the through hole, an excitation electrode and a response electrode are embedded in one end of the insulator, and the excitation electrode and the response electrode are separated by the insulator; One end of the insulator away from the excitation electrode and the response electrode is provided with a shielding electrode mounted on a mounting plate to cover the insulator, and the shielding electrode is provided with a first connector and a second connector; the first connector passes through the shielding electrode to connect to the excitation electrode, and the second connector passes through the shielding electrode to connect to the response electrode.

2. A planar grain moisture sensor according to claim 1, characterized in that: The mounting plate is provided with a temperature sensor mounting hole.

3. A planar grain moisture sensor according to claim 1, characterized in that: Sensor mounting holes are provided at the four corners of the mounting plate.

4. A planar grain moisture sensor according to claim 1, characterized in that: The plane of the insulator where the excitation electrode and the response electrode are located is parallel to the grain flow direction and is not higher than the surface of the mounting plate.

5. The planar grain moisture sensor according to claim 1, characterized in that: The insulator is configured as a cylindrical structure, the shielding electrode is configured as an integrated cylindrical shell structure, and the shielding electrode is covered on the outside of the insulator and installed on one side of the mounting plate.

6. A planar grain moisture sensor according to claim 5, characterized in that: The first connector and the second connector are arranged on a circular end surface of the shielding electrode of the cylindrical housing away from the mounting plate.

7. The planar grain moisture sensor according to claim 5, characterized in that: The shielding electrode is detachably mounted on the mounting plate via mounting bolts, and the shielding electrode and the insulator are mounted together via fixing bolts.

8. The planar grain moisture sensor according to claim 1, characterized in that: The diameter of the circular end surface of the insulator is consistent with the diameter of the through hole.

9. The planar grain moisture sensor according to claim 8, characterized in that: The response electrode is configured as a circular ring structure embedded in the circular end face of the insulator. The outer diameter of the circular ring structure is smaller than the diameter of the insulator. The response electrode is concentrically arranged with the center of the insulator.

10. The planar grain moisture sensor according to claim 9, characterized in that: The excitation electrode is configured as a circular plate structure with a diameter smaller than the inner diameter of the response electrode ring structure and is embedded on the circular end surface of the insulator. The excitation electrode is concentrically arranged with the center of the insulator.

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