Microwave moisture testing device and method

Abstract

The invention discloses a microwave moisture testing device which is used for testing moisture content of materials and comprises a water testing device and a material bearing device, the water testing device is provided with a microwave antenna used for transmitting and receiving microwaves, and a transmission window is arranged on one side close to the material bearing device. And microwaves emitted by the microwave antenna penetrate through the transmission window, then irradiate the material carried by the material carrying device, are reflected and then are received by the microwave antenna, so that the moisture content in the material is tested. The invention further discloses a microwave moisture testing method adopting the microwave moisture testing device. According to the microwave moisture testing device and method, the microwave antenna and the material are isolated through the transmission window, the antenna is prevented from being polluted by the material, the testing accuracy can be improved, and the testing result is more accurate.

Description

Technical Field

[0001] The present application relates to the field of testing technology, and in particular to a microwave moisture testing device and method. Background Art

[0002] Microwave moisture testing is a technology that uses microwave penetration to detect the moisture content in materials. It establishes a correlation between the power attenuation and phase shift changes of the transmitted microwaves and the moisture content in the material. This technology plays an important role in the automated control of industrial processes and is suitable for the detection of materials such as coal, alumina, wood, grain, and medicines.

[0003] The existing microwave water measurement technology is as follows: the transmitting antenna and the receiving antenna are arranged on both sides of the loading platform, the material is manually placed on the loading platform, the microwaves emitted by the transmitting antenna penetrate the material and the loading platform, and then are received by the receiving antenna. The tester establishes a correlation with the moisture content in the material based on the power attenuation and phase shift change of the transmitted microwave, and then calculates the moisture content of the material.

[0004] However, the existing microwave water measurement scheme has the following problems: 1. Manually place the test material on the loading platform and then analyze it. It is suitable for laboratory or offline moisture testing of static materials, but not suitable for online analysis of materials. 2. The microwave transmitting antenna and receiving antenna are arranged on both sides of the loading platform, which will cause troubles in antenna installation, alignment and maintenance, and are easily contaminated, affecting the test results; 3. The distance between the microwave transmitting antenna and the receiving antenna is relatively far, and the microwave needs to penetrate the carrier platform to be received, which causes the changes in the temperature and humidity of the air and the properties of the carrier platform to have a great impact on the sample test results; 4. The microwave transmitting antenna and receiving antenna are not isolated from the sample, which may cause the sample to contaminate the antenna and affect the test results. Summary of the invention

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide a microwave moisture testing device and method which can improve the test accuracy.

[0006] The technical solution provided by the present invention is as follows: A microwave moisture testing device is used to test the moisture content of a material, comprising a water measuring device and a material carrying device. The water measuring device is provided with a microwave antenna for emitting and receiving microwaves, and a transmission window is provided on a side close to the material carrying device, so that the microwaves emitted by the microwave antenna pass through the transmission window and irradiate the material carried by the material carrying device, and are received by the microwave antenna after reflection, so as to realize the test of the moisture content in the material.

[0007] Preferably, the water measuring device comprises a housing, and the microwave antenna is enclosed and placed inside the housing.

[0008] Preferably, a surface of the housing is provided with an opening, and the transmission window is installed on the opening.

[0009] Preferably, the microwave antenna is an integrated transmitting and receiving antenna.

[0010] Preferably, the microwave antenna is integrated on the transmission window.

[0011] Preferably, the material carrying device is located below the water measuring device, and includes a conveying mechanism to continuously convey the material to the bottom of the transmission window for testing.

[0012] Preferably, the material carrying device also includes a feed port and a discharge port respectively located at the front and rear ends of the conveying mechanism, which are used to allow the material to fall from the feed port onto the conveying mechanism, be transported by the conveying mechanism to the bottom of the transmission window for testing, and then be discharged through the discharge port after the test.

[0013] Preferably, the conveying mechanism includes a power mechanism and a transmission mechanism, the transmission mechanism is a belt transmission mechanism, the power mechanism is connected to a driving wheel, and the power mechanism drives the driving wheel to rotate, so that the belt drives the carried material to move.

[0014] A microwave moisture testing method adopts the microwave moisture testing device as described above, and the method comprises: the material falls from a feed port onto a conveying mechanism; the conveying mechanism conveys the material to below a transmission window; the microwaves emitted by a microwave antenna pass through the transmission window and irradiate the material carried by a material carrying device, and are then received by the microwave antenna after reflection, so as to test the moisture content in the material; and the material is discharged through a discharge port after the test.

[0015] Preferably, the test of the moisture content in the material includes: establishing a correlation between the power attenuation and phase shift change of the transmitted microwave and the moisture content in the material, and then calculating the moisture content in the material.

[0016] Compared with the prior art, the microwave moisture testing device and method of the present invention isolates the microwave antenna from the material through a transmission window, thereby avoiding material contamination of the antenna, improving the test accuracy, and making the test results more accurate. In addition, because of the isolation of the transmission window, the antenna is close to the material, and the microwave does not need to penetrate the loading platform for reception, thus reducing external environmental interference. In addition, the transmitting antenna and the receiving antenna are designed as one piece, which is easy to install and maintain. A conveying mechanism is provided to convey the material, which can realize online moisture testing of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic structural diagram of a microwave moisture testing device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0021] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0023] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0024] like Figure 1 As shown, an embodiment of the present invention provides a microwave moisture testing device for testing the moisture content of a material. Microwaves are high-frequency electromagnetic waves. The attenuation and phase change produced when transmitting through a medium are mainly determined by the dielectric constant and dielectric loss tangent of the medium. Water is a polar molecule, and its dielectric constant and loss tangent are much higher than those of general media. Therefore, by transmitting microwaves through materials, the moisture content in the material can be measured based on the attenuation of microwave power and the change in phase shift.

[0025] The microwave moisture testing device comprises a moisture testing device 1 and a material carrying device 2. In this embodiment, the material carrying device 2 is located below the moisture testing device 1. Of course, in other embodiments, the material carrying device 2 can also be located at other positions of the moisture testing device 1.

[0026] In this embodiment, the water measuring device 1 includes a housing 11, a microwave antenna 12, and a transmission window 13. The housing 11 is in a rectangular shape, and an opening is provided on the bottom surface. The microwave antenna 12 is used to transmit and receive microwaves, and is closed and placed in the housing 11. In this embodiment, the microwave antenna 12 is an integrated transmitting and receiving antenna, and is simple to install and maintain. The transmission window 13 is installed on the opening, so that the microwaves emitted by the microwave antenna 12 pass through the transmission window 13 and irradiate the material 3 carried by the material carrying device 2, and are received by the microwave antenna 12 after reflection, so as to realize the test of the moisture content in the material 3. In this embodiment, the microwave antenna 12 is integrated on the transmission window 13, so that it can be installed on the opening together with the transmission window 13, and the installation and maintenance are simpler and more convenient. Of course, the microwave antenna 12 and the transmission window 13 can also be designed and installed separately. The positions of the opening and the transmission window 13 correspond to the material carrying device 2, so that the transmission window 13 is set on a side close to the material carrying device 2. In other embodiments, if the material carrying device 2 is located at other positions of the water measuring device 1, the positions of the opening and the transmission window 13 will also be adjusted accordingly.

[0027] In this embodiment, the material carrying device 2 includes a conveying mechanism and a feed port 22 and a discharge port 23 respectively located at the front and rear ends of the conveying mechanism. The conveying mechanism is used to continuously convey the material 3 to the bottom of the transmission window 13 for testing. In this embodiment, the conveying mechanism includes a power mechanism (such as a motor, not shown) and a transmission mechanism, and the transmission mechanism is a belt transmission mechanism. The power mechanism is connected to the driving wheel 211, and the driving wheel 211 is driven to rotate by the power mechanism, so that the belt 212 drives the carried material 3 to move. Of course, in other embodiments, the conveying mechanism can adopt other structural forms.

[0028] The feed port 22 and the discharge port 23 are used to allow the material 3 to fall from the feed port 22 onto the conveying mechanism, be conveyed by the conveying mechanism to the bottom of the transmission window 13 for testing, and then be discharged through the discharge port 23 after the test.

[0029] This embodiment also provides a microwave moisture testing method, using the microwave moisture testing device as described above, the method comprising: the material 3 falls from the feed port 22 onto the conveying mechanism; the conveying mechanism conveys the material 3 to the bottom of the transmission window 13; the microwave emitted by the microwave antenna 12 passes through the transmission window 13 and irradiates the material 3 carried by the material carrying device 2, and is then received by the microwave antenna 12 after reflection, and the moisture content in the material 3 is tested; the material 3 is discharged through the discharge port 23 after the test. Specifically, in this embodiment, the test of the moisture content in the material 3 includes: establishing a correlation between the power attenuation and phase shift change of the transmitted microwave and the moisture content in the material 3, and then calculating the moisture content in the material 3.

[0030] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A microwave moisture testing device for testing the moisture content of a material, characterized in that: It includes a water measuring device and a material carrying device. The water measuring device is provided with a microwave antenna for emitting and receiving microwaves. A transmission window is provided on the side close to the material carrying device, so that the microwaves emitted by the microwave antenna pass through the transmission window and irradiate the material carried by the material carrying device, and are received by the microwave antenna after reflection, so as to realize the test of the moisture content in the material.

2. The microwave moisture testing device according to claim 1, characterized in that: The water measuring device comprises a shell, and the microwave antenna is enclosed and placed in the shell.

3. The microwave moisture testing device according to claim 1, characterized in that: An opening is arranged on a surface of the housing, and the transmission window is installed on the opening.

4. The microwave moisture testing device according to claim 1, characterized in that: The microwave antenna is an integrated transmitting and receiving antenna.

5. The microwave moisture testing device according to claim 1, characterized in that: The microwave antenna is integrated on the transmission window.

6. The microwave moisture testing device according to any one of claims 1 to 5, characterized in that: The material carrying device is located below the water measuring device and includes a conveying mechanism to continuously convey the material to the bottom of the transmission window for testing.

7. The microwave moisture testing device according to claim 6, characterized in that: The material carrying device also includes a feed port and a discharge port respectively located at the front and rear ends of the conveying mechanism, which are used to allow the material to fall from the feed port onto the conveying mechanism, be transported by the conveying mechanism to the bottom of the transmission window for testing, and then be discharged through the discharge port after the test.

8. The microwave moisture testing device according to claim 7, characterized in that: The conveying mechanism includes a power mechanism and a transmission mechanism. The transmission mechanism is a belt transmission mechanism. The power mechanism is connected to a driving wheel. The power mechanism drives the driving wheel to rotate, so that the belt drives the carried material to move.

9. A microwave moisture testing method, characterized in that: Using the microwave moisture testing device as described in claim 7 or 8, the method includes: the material falls from the feed port onto the conveying mechanism; the conveying mechanism conveys the material to the bottom of the transmission window; the microwaves emitted by the microwave antenna pass through the transmission window and irradiate the material carried by the material carrying device, and are then received by the microwave antenna after reflection, to test the moisture content in the material; the material is discharged through the discharge port after the test.

10. The microwave moisture testing method according to claim 9, characterized in that: The test of the moisture content in the material includes: establishing a correlation between the power attenuation and phase shift change of the transmitted microwave and the moisture content in the material, and then calculating the moisture content in the material.

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