Online near-infrared moisture detector

Abstract

The utility model belongs to the field of moisture detectors, and particularly relates to an online near-infrared moisture detector which comprises a lower shell and an upper shell, the lower shell and the upper shell are connected through bolts, a dust cover is fixedly connected to the bottom of the lower shell, a sintering ring and an air pipe connector are arranged on the dust cover, and the sintering ring and the air pipe connector are connected through bolts. An infrared temperature sensor body is arranged at the bottom of the lower shell and located on the right side of the dustproof cover, and an aviation connector interface and an antenna are arranged on the right side of the upper shell. The online real-time moisture measuring structure is creatively improved, so that the efficiency of an optical system is enhanced, and the sensitivity, the accuracy and the stability of moisture detection are improved; an infrared temperature detection function is added, synchronization with moisture measurement can be achieved, the material temperature can be tested online in real time, and automatic temperature compensation is conducted on a moisture measurement result according to the material temperature; and a wireless data communication function based on the LoRa technology is added, so that a wireless ad hoc network can be realized, and the actual demand of on-site remote real-time data transmission is met.

Description

Technical Field

[0001] This utility model relates to the field of moisture detectors, specifically an online near-infrared moisture detector. Background Technology

[0002] The main methods for moisture determination include: direct drying, vacuum drying, distillation, Karl Fischer method, coulometric method, dew point method, microwave method, and infrared absorption spectroscopy. Most of these methods have drawbacks, such as long measurement cycles, the need for sample preparation, and laboratory testing, making them unsuitable for online real-time measurement in production environments. Others may have limitations, such as a narrow measurement range for specific material types.

[0003] The principle of near-infrared moisture detection: The molecular structure of a substance, such as oxygen-hydrogen bonds in water and carbon-hydrogen bonds in organic matter, absorbs near-infrared light of specific wavelengths. The energy of the reflected near-infrared light of a specific wavelength is inversely proportional to the number of molecules that absorb near-infrared light. Near-infrared spectroscopy is electromagnetic radiation between the visible and mid-infrared spectra, possessing a specific wavelength range. The absorption characteristics of a substance in the near-infrared spectral region are closely related to its molecular structure. Therefore, by analyzing the absorption and reflection characteristics of a substance in the near-infrared spectrum, information about its composition and properties can be obtained.

[0004] Online near-infrared moisture analyzers utilize this principle to determine the moisture content of a sample by measuring its absorption characteristics in the near-infrared spectral region. The analyzer employs a high-performance near-infrared light source and detector, capable of emitting and receiving near-infrared light of specific wavelengths. When near-infrared light illuminates the sample, water molecules in the sample absorb a portion of the light, while the unabsorbed light is received by the detector. The analyzer processes and analyzes the received light signal to determine the corresponding moisture content.

[0005] Currently available online near-infrared moisture detectors suffer from limited functionality, only capable of measuring moisture content and unable to effectively sense real-time ambient temperature for material temperature measurement and autonomous temperature compensation. Furthermore, their communication interfaces primarily utilize traditional RS-485 and 4-20mA interfaces, which fail to meet the demands of current IoT networking. Therefore, improvements are necessary. Utility Model Content

[0006] The purpose of this invention is to provide an online near-infrared moisture detector, which solves the problems of limited functionality and inability to meet the current Internet of Things (IoT) networking requirements of existing online near-infrared moisture detectors on the market.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an online near-infrared moisture detector, comprising a lower outer shell and an upper outer shell, wherein the lower outer shell and the upper outer shell are connected by bolts, a dust cover is fixedly connected to the bottom of the lower outer shell, and a sintering ring and an air pipe interface are provided on the dust cover, an infrared temperature sensor body is provided at the bottom of the lower outer shell and on the right side of the dust cover, an aviation connector interface and an antenna are provided on the right side of the upper outer shell, and two round tube fasteners are fixedly connected to the top of the upper outer shell.

[0008] Preferably, a base plate is bolted to the inner bottom of the lower housing. An optical system base is fixedly connected to the upper left side of the base plate, and the position of the optical system base corresponds to that of the dust cover. A reflector mount is bolted to the top of the optical system base. A concave reflector is provided inside the upper opening of the reflector mount. A motor mount is installed in the middle of the upper end of the base plate. A motor is fixedly installed on the right side of the motor mount. The output shaft of the motor passes through the motor mount and is connected to the motor mount through a bearing. A turntable is bolted to the end of the output shaft. A light source lens, a light source lamp holder, a light source lamp chamber, and a light source concave reflector are sequentially installed on the upper right side of the base plate. The motor drives the turntable to rotate at a preset constant speed, so that the filters on the turntable are sequentially coaxial with the light-transmitting holes of the motor mount.

[0009] Preferably, the turntable has filter fixing holes and filter positioning holes. A filter can be embedded in the filter fixing holes.

[0010] Preferably, a detector circuit board is mounted on the inner side of the upper housing, above the light source lens, light source holder, light source chamber, and concave reflector. The detector circuit board includes a regulated power supply circuit, an RS communication interface, a light source power supply circuit, a motor drive circuit, a detector circuit board power supply circuit and communication interface, an infrared temperature sensor interface, an internal temperature sensor circuit, a LoRa wireless communication module circuit, and a status indicator circuit, etc., to realize functions such as moisture detection, motor control, light source control, internal temperature detection, material infrared temperature detection, automatic temperature compensation of moisture detection values, and wired or LoRa wireless self-organizing network communication with a host computer.

[0011] Preferably, a bracket is bolted to the upper end of the base plate, and a photoelectric switch is mounted on the bracket. The photoelectric switch detects the position of the filter positioning hole on the turntable in real time, thereby performing initial and sequential positioning of the filter, and forming a closed loop with the motor drive circuit. Through a PID algorithm, closed-loop control of the motor is achieved to ensure stable motor speed.

[0012] Preferably, a detector circuit board is mounted on the inner side of the upper housing and above the reflector mount, and a detector body is disposed on the detector circuit board. The detector circuit board acquires the photoelectric signal and photoelectric switch signal of the filter output by the detector body in real time and uploads them to the processor of the detector circuit board in real time.

[0013] Preferably, the motor base has a light-transmitting hole that extends through the motor base. The position of the light-transmitting hole corresponds to the position of the light source lens. A beam-splitting lens is provided on the side of the reflector base, and the position of the beam-splitting lens corresponds to the position of the light-transmitting hole. An elliptical mirror base is fixedly connected inside the reflector base, and an elliptical reflector is provided on the elliptical mirror base. The elliptical reflector reflects the light source signal, which is then transmitted through the glass window of the lower housing to illuminate the surface of the material.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention creatively improves the online real-time moisture measurement structure, enhancing the efficiency of the optical system and improving the sensitivity, accuracy, and stability of moisture detection. It adds an infrared temperature detection function, allowing for real-time online testing of material temperature synchronized with moisture measurement, and autonomously compensating for moisture measurement results based on the material temperature. Furthermore, it adds a LoRa-based wireless data communication function, enabling wireless self-organizing networks and meeting the practical needs of remote real-time data transmission in the field. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 For the present utility model Figure 1 Internal structure diagram Figure 1 ;

[0018] Figure 3 For the present utility model Figure 1 Internal structure diagram Figure 2 ;

[0019] Figure 4 For the present utility model Figure 2 A schematic diagram of the internal structure of the reflector mount;

[0020] Figure 5 For the present utility model Figure 2 A schematic diagram of the turntable structure.

[0021] In the diagram: 1. Lower outer shell; 2. Upper outer shell; 3. Dust cover; 4. Sintered ring; 5. Air pipe interface; 6. Infrared temperature sensor body; 7. Aviation connector interface; 8. Antenna; 9. Round tube fixing component; 101. Base plate; 10. Optical system base; 11. Reflector mount; 12. Concave reflector; 13. Bracket; 14. Photoelectric switch; 15. Motor mount; 151. Light transmission hole; 16. Motor; 17. Turntable; 171. Filter fixing hole; 172. Filter positioning hole; 18. Light source lens; 19. Light source lamp holder; 20. Light source lamp chamber; 21. Light source concave reflector; 22. Detector circuit board; 23. Detector body; 24. Beam splitter lens; 25. Elliptical mirror mount; 26. Elliptical reflector; 27. Detector circuit board. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-5 An online near-infrared moisture detector includes a lower outer shell 1 and an upper outer shell 2, which are connected by bolts. A dust cover 3 is fixedly connected to the bottom of the lower outer shell 1. A sintered ring 4 and an air pipe interface 5 are provided on the dust cover 3. An infrared temperature sensor body 6 is provided at the bottom of the lower outer shell 1 and on the right side of the dust cover 3. An aviation connector interface 7 and an antenna 8 are provided on the right side of the upper outer shell 2. Two round tube fasteners 9 are fixedly connected to the top of the upper outer shell 2.

[0024] Please see Figure 1-5A base plate 101 is bolted to the bottom inner side of the lower outer casing 1. An optical system base 10 is fixedly connected to the upper left side of the base plate 101, and the position of the optical system base 10 corresponds to that of the dust cover 3. A reflector mount 11 is bolted to the top of the optical system base 10. A concave reflector 12 is provided inside the upper opening of the reflector mount 11. A motor mount 15 is installed in the middle of the upper part of the base plate 101. A motor 16 is fixedly installed on the right side of the motor mount 15. The output shaft of the motor 16 passes through the motor mount 15 and is connected to the motor mount 15 through a bearing. A turntable 17 is bolted to the end of the output shaft. The turntable 17 has a filter fixing hole 171 and a filter positioning hole 172. A filter can be embedded in the filter fixing hole 171. A light source lens 18, a light source lamp holder 19, a light source lamp chamber 20, and a light source concave reflector 21 are installed sequentially on the upper right side of the base plate 101. The motor 16 drives the turntable 17 to rotate at a preset constant speed, so that the filters on the turntable 17 are coaxial with the light-transmitting holes 151 of the motor base 15.

[0025] Please see Figure 2-3 A detector circuit board 27 is mounted on the inner side of the upper casing 2, above the light source lens 18, light source lamp holder 19, light source lamp chamber 20, and light source concave reflector 21. The detector circuit board 27 includes a regulated power supply circuit, an RS485 communication interface, a light source power supply circuit, a motor drive circuit, a detector circuit board power supply circuit and communication interface, an infrared temperature sensor interface, an internal temperature sensor circuit, a LoRa wireless communication module circuit, and a status indicator circuit. It enables functions such as moisture detection, motor control, light source control, internal temperature detection, material infrared temperature detection, automatic temperature compensation for moisture detection values, and wired or LoRa wireless self-organizing network communication with a host computer.

[0026] Please see Figure 1-5 A bracket 13 is bolted to the upper end of the base plate 101, and a photoelectric switch 14 is installed on the bracket 13. The photoelectric switch 14 detects the position of the filter positioning hole 172 on the turntable 17 in real time, thereby performing initial and sequential positioning of the filter, and forming a closed loop with the drive circuit of the motor 16. Through the PID algorithm, the closed loop control of the motor 16 is realized to ensure the stable speed of the motor 16.

[0027] A detector circuit board 22 is mounted on the inner side of the upper outer casing 2, above the reflector mount 11. A detector body 23 is mounted on the detector circuit board 22. The detector circuit board 22 collects the photoelectric signal from the filter and the photoelectric switch 14 signal output by the detector body 23 in real time and uploads them to the processor of the detector circuit board 27 in real time. A light-transmitting hole 151 is provided on the motor mount 15, and the light-transmitting hole 151 extends through the motor mount 15. The position of the light-transmitting hole 151 corresponds to the light source lens 18. A beam-splitting lens 24 is provided on the side of the reflector mount 11, and the position of the beam-splitting lens 24 corresponds to the light-transmitting hole 151. An elliptical mirror mount 25 is fixedly connected inside the reflector mount 11, and an elliptical reflector 26 is mounted on the elliptical mirror mount 25. The elliptical reflector 26 reflects the light source signal, which shines through the glass window of the lower outer casing 1 onto the surface of the material.

[0028] The specific implementation process of this utility model is as follows:

[0029] S1: After the detector is powered on, the motor 16 and the light source in the light source holder 19 are started;

[0030] S2: The light source is enhanced by diffuse reflection through the inner wall of the light source chamber 20, and is focused by the concave reflector 21 of the light source to obtain a light source signal with further enhanced brightness;

[0031] S3: The light source signal passes through the light-transmitting hole 151 on the front side of the light source chamber 20 and is focused by the light source lens 18;

[0032] S4: The motor 16 drives the turntable 17 to rotate at a preset constant speed, so that the filters on the turntable 17 are coaxial with the light-transmitting hole 151 of the motor base 15 in sequence, so that the light source signal focused by the light source lens 18 passes through the light-transmitting hole 151 of the motor base 15 and is focused on the center of the filter coaxial with the light-transmitting hole 151 of the motor base 15.

[0033] S5: The light source signal passing through the filter is directed to the beam splitter 24, which performs secondary focusing and transmits the light source signal to the elliptical reflector 26 inside the optical system base 10.

[0034] S6: The elliptical reflector 26 reflects the light source signal and illuminates the material surface through the glass window of the lower housing 1.

[0035] S7: The near-infrared light absorbed and reflected back by the material passes through the glass window of the lower housing 1 and illuminates the concave reflector 12. The concave reflector 12 focuses the reflected near-infrared light onto the detector window.

[0036] S8: The photoelectric switch 14 detects the position of the filter positioning hole 172 of the turntable 17 in real time, thereby performing initial and sequential positioning of the filter, and forming a closed loop with the drive circuit of the motor 16. Through the PID algorithm, the closed loop control of the motor 16 is realized to ensure the stable speed of the motor 16.

[0037] S9: The detector circuit board 22 collects the photoelectric signal of the filter output by the detector and the photoelectric switch 14 signal in real time, and uploads them to the processor of the detector circuit board 27 in real time.

[0038] S10: The processor of the detector circuit board 27 receives and processes in real time the photoelectric signal corresponding to the filter uploaded by the detector circuit board 22 and the position signal of the turntable 17 detected by the photoelectric switch 14, performs data analysis and processing, and calculates the moisture content. Through the infrared temperature sensor body 6 and the temperature sensor on the detector circuit board 27, the surface temperature of the material and the internal temperature of the detector are collected in real time, and automatic temperature compensation is performed on the calculated moisture content.

[0039] S11: The detector circuit board 27 transmits the calculated moisture and temperature values ​​to the field controller and host computer in real time via the LoRa wireless module and RS485 communication circuit for further data monitoring, analysis, processing, recording and storage.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An on-line near infrared moisture meter comprising a lower housing (1) and an upper housing (2), characterized in that: The lower shell (1) and the upper shell (2) are connected by bolts, the bottom of the lower shell (1) is fixedly connected with a dust cover (3), the dust cover (3) is provided with a sintering ring (4) and an air pipe interface (5), the bottom of the lower shell (1) and located at the right side of the dust cover (3) is provided with an infrared temperature sensor body (6), the right side of the upper shell (2) is provided with an aviation connector interface (7) and an antenna (8), and the top of the upper shell (2) is fixedly connected with two circular tube fixing members (9).

2. The on-line near infrared moisture meter according to claim 1, characterized in that: The inner bottom of the lower shell (1) is provided with a bottom plate (101) through bolt mounting, the upper end of the left side of the bottom plate (101) is fixedly connected with an optical system base (10), and the optical system base (10) corresponds to the position of the dust cover (3), the top of the optical system base (10) is provided with a mirror seat (11) through bolt mounting, the inner side of the upper end opening of the mirror seat (11) is provided with a concave mirror (12), the upper end of the middle of the bottom plate (101) is provided with a motor seat (15), the right side of the motor seat (15) is fixedly provided with an electric motor (16), the output shaft of the electric motor (16) penetrates the motor seat (15) and is connected with the motor seat (15) through a bearing, the end of the output shaft is provided with a rotating disc (17) through bolt mounting, and the right side of the upper end of the bottom plate (101) is sequentially provided with a light source lens (18), a light source lamp holder (19), a light source lamp chamber (20) and a light source concave reflector (21).

3. The on-line near infrared moisture meter according to claim 2, characterized in that: The rotating disc (17) is provided with a filter fixing hole (171) and a filter positioning hole (172).

4. The on-line near infrared moisture meter according to claim 2, characterized in that: The inner side of the upper shell (2) and located above the light source lens (18), the light source lamp holder (19), the light source lamp chamber (20) and the light source concave reflector (21) is provided with a detector circuit board (27).

5. The on-line near infrared moisture meter according to claim 2, wherein: The upper end of the bottom plate (101) is provided with a bracket (13) through bolt mounting, and the bracket (13) is provided with a photoelectric switch (14).

6. The on-line near infrared moisture meter according to claim 2, characterized in that: The inner side of the upper shell (2) and located above the mirror seat (11) is provided with a detector circuit board (22), and the detector circuit board (22) is provided with a detector body (23).

7. The on-line near infrared moisture meter according to claim 2, wherein: The motor seat (15) is provided with a light passing hole (151), and the light passing hole (151) penetrates the motor seat (15), the position of the light passing hole (151) corresponds to the light source lens (18), the side of the mirror seat (11) is provided with a light splitting lens (24), the position of the light splitting lens (24) corresponds to the light passing hole (151), the inside of the mirror seat (11) is fixedly connected with an elliptical mirror seat (25), and the elliptical mirror seat (25) is provided with an elliptical mirror (26).

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