Punching-free installation structure of fiber grating temperature sensor of electrolytic aluminum tank and temperature measurement system thereof

Abstract

The utility model provides a fiber bragg grating temperature sensor punching-free installation structure of an electrolytic aluminum tank and a temperature measuring system thereof, the punching-free installation structure comprises an installation clamp and an insulating rod, the installation clamp is a U-shaped clamp, the installation clamp comprises an installation plate and clamping arms arranged on two sides of the installation plate, and the insulating rod is arranged on the installation plate. Wherein one end, close to the mounting plate, of one clamping arm protrudes outwards to form a space for the fiber bragg grating temperature sensor to penetrate through, and a first mounting hole and a second mounting hole are formed in the mounting plate and used for fixing the fiber bragg grating temperature sensor. According to the utility model, the structure is simple, punching-free installation can be realized, the fiber grating temperature sensor is rapidly fixed on the cathode bar of the electrolytic aluminum tank in a clamping and fixing manner, the temperature of the front surface or the side surface of the cathode bar can be measured according to needs, the operation is convenient, the temperature measurement is accurate, and the practical value is high.

Description

Technical Field

[0001] This utility model relates to the field of fiber optic temperature measurement, specifically a non-drilling mounting structure for a fiber optic grating temperature sensor in an electrolytic aluminum tank and its temperature measurement system. Background Technology

[0002] The electrolytic aluminum industry occupies a vital position in the modern industrial system and is a key source of raw materials for the defense and aerospace industries. As the core facility in the entire electrolytic aluminum production process, the stable operation of the electrolytic aluminum cell is crucial for ensuring product quality and reducing production costs. Temperature during the electrolysis reaction is a key factor influencing the efficient production of the entire unit, affecting the reaction process, product quality, and energy consumption to varying degrees. Traditional methods for temperature detection in electrolytic cells mainly rely on temperature guns, infrared monitoring devices, and thermocouples. However, electromagnetic interference in the electrolytic aluminum cell affects the accuracy of temperature measurements, and thermocouples require holes in the cell body for fixation and can only achieve single-point measurements. Therefore, adopting new technologies suitable for the production equipment and on-site environment is essential and necessary to improve and optimize accurate temperature monitoring during electrolytic cell production, ensuring production safety and product quality.

[0003] Fiber Bragg grating temperature sensors have become an ideal choice for temperature monitoring in aluminum electrolytic cells due to their significant advantages, including high precision, resistance to electromagnetic interference, corrosion resistance, small size, and continuous temperature detection. However, large aluminum electrolytic cells operate in harsh environments with strong cathode currents, and existing temperature measurement methods for these cells suffer from challenges such as difficult sensor installation, susceptibility to sensor damage, and difficulty in retrofitting older cells. Therefore, how to securely and effectively install sensors in aluminum electrolytic cells, while also ensuring easy disassembly and replacement, is a critical technical challenge that urgently needs to be addressed. Utility Model Content

[0004] To address the shortcomings of the existing technology, this utility model provides a fiber optic grating temperature sensor installation structure and temperature measurement system for an electrolytic aluminum tank that requires no drilling. This structure is easy to install, requires no drilling, provides accurate temperature measurement of the electrolytic aluminum tank, and is convenient to use.

[0005] The technical solution provided by this utility model is as follows: a non-drilling mounting structure for a fiber optic grating temperature sensor in an electrolytic aluminum tank, including a mounting clamp and an insulating rod. The mounting clamp is a U-shaped clamp, which includes a mounting plate and clamping arms disposed on both sides of the mounting plate. One of the clamping arms protrudes outward from the end near the mounting plate to form a space for the fiber optic grating temperature sensor to pass through. The mounting plate has a first mounting hole and a second mounting hole for fixing the fiber optic grating temperature sensor.

[0006] Furthermore, the mounting fixture is integrally formed, and the clamping arms on both sides of the mounting plate are wavy, with the middle of the clamping arms on both sides used to fix the object to be measured.

[0007] Furthermore, a linear fiber Bragg grating temperature sensor is passed through the first mounting hole. The linear fiber Bragg grating temperature sensor is fixed between the outwardly protruding clamping arm and the object to be measured, and is used to measure the temperature of the side of the object to be measured.

[0008] Furthermore, the second mounting hole is used to pass through an L-shaped fiber optic temperature sensor, which is fixed between the mounting plate and the object to be measured, and is used to measure the temperature of the end face of the object.

[0009] Furthermore, a connecting nut is provided in the middle of the mounting plate, and one end of the insulating rod is threadedly connected to the connecting nut, so that the insulating rod is fixed on the side of the mounting plate away from the clamp arm, which is used to push the mounting fixture onto the object to be measured.

[0010] Furthermore, the mounting fixture is made of aluminum alloy, which has a certain degree of toughness.

[0011] Another technical solution provided by this utility model: a fiber optic temperature sensor temperature measurement system for an electrolytic aluminum tank, including the aforementioned non-drilling mounting structure, and further including a fiber optic temperature sensor, a coupler, a fiber optic collection box, and an optical fiber demodulation system. The non-drilling mounting structure attaches the fiber optic temperature sensor to the surface of the cathode rod of the electrolytic aluminum tank. Each fiber optic temperature sensor is connected to the coupler via a transmission optical cable, and multiple fiber optic temperature sensors are coupled into a single sensor. The output end of the coupler is connected to a multi-core optical cable, which is then connected to the fiber optic collection box and subsequently to the optical fiber demodulation system.

[0012] Furthermore, the fiber Bragg grating temperature sensor includes two types: linear fiber Bragg grating temperature sensor and L-shaped fiber Bragg grating temperature sensor. Each fiber Bragg grating temperature sensor includes a temperature probe, a temperature measuring section metal tube, an adapter, a pigtail, and an FC / APC jumper. The temperature measuring section metal tube is sleeved outside the temperature probe. The adapter connects the temperature probe and the pigtail. The other end of the pigtail is connected to the FC / APC jumper 505. The FC / APC jumper is connected to the transmission optical cable. A dust cap is provided on the outside of the FC / APC jumper.

[0013] Furthermore, the temperature measuring section metal tube is a 316 stainless steel metal tube, and the top of the temperature measuring section metal tube is a cylindrical stainless steel welded plug with an outer diameter of 2-3mm. The temperature measuring probe is a temperature measuring optical fiber, which can be any one of quartz optical fiber, sapphire optical fiber, YAG crystal optical fiber, photonic crystal optical fiber, or high-temperature resistant optical fiber.

[0014] Furthermore, the fiber optic demodulation system includes a computer, a demodulator, and optical switches. The optical cables coming out of the fiber optic collection box are connected to different optical switches and output to the demodulator. The demodulator is connected to the computer signal and displays the reading of the fiber optic grating temperature sensor.

[0015] The beneficial effects of this utility model are:

[0016] (1) The punch-free installation structure of this utility model is easy to use and can quickly attach the fiber optic temperature sensor to the surface of the object to be measured. The installation position of the fiber optic temperature sensor can be installed on the front or side as required, and temperature can be measured at different positions to achieve efficient temperature measurement function.

[0017] (2) The mounting fixture of this utility model has a certain toughness for direct clamping and installation, and has anti-corrosion properties, ensuring that the fiber optic temperature sensor can be closely attached to the fixture and the object to be measured. It is durable and easy to install, and the sensor can be disassembled and replaced without affecting the production progress.

[0018] (3) The temperature measurement system of this utility model adopts an optical fiber temperature sensor with a measurement range of -50-800℃. The measurement is accurate and efficient. The sensor is protected by an external metal sleeve, which improves its service life. Multiple measuring points can be arranged on one sensor to achieve simultaneous detection at multiple points without interference. It can also monitor the temperature data of different electrolytic aluminum tanks at the same time. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the drilling-free installation structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the temperature measurement system of this utility model;

[0021] Figure 3 This is a schematic diagram of the linear fiber optic temperature sensor of this utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the L-shaped fiber optic temperature sensor of this utility model;

[0023] Figure 5 This is a schematic diagram of the fiber optic demodulation system of this utility model;

[0024] Figure 6 This is a plan view of the electrolytic aluminum cell of this utility model;

[0025] In the diagram: 1—Mounting clamp, 101—Mounting plate, 102—Clamping arm, 103—First mounting hole, 104—Second mounting hole, 105—Connecting nut, 2—Insulating rod, 3—Coupler, 4—Fiber optic collection box, 5—Fiber optic grating temperature sensor, 501—Temperature probe, 502—Temperature measuring section metal tube, 503—Adapter, 504—Pigtail, 505—FC / APC jumper head, 506—Dust cap, 6—Fiber optic demodulation system, 601—Computer, 602—Demodulator, 603—Optical switch, 7—Transmission optical cable, 8—Cathode rod. Detailed Implementation

[0026] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. In order to better illustrate the specific embodiments of the present invention, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the actual product size. It is understandable for those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this utility model, it should be noted that the terms "front," "rear," "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Example 1

[0030] like Figure 1The diagram shows a non-drilling mounting structure for a fiber Bragg grating temperature sensor in an electrolytic aluminum tank, including a mounting clamp 1 and an insulating rod 2. The mounting clamp 1 is a U-shaped clamp, which includes a mounting plate 101 and clamping arms 102 disposed on both sides of the mounting plate 101. One end of one clamping arm 102 protrudes outward near the mounting plate 101, forming a space for the fiber Bragg grating temperature sensor 5 to pass through. The mounting plate 101 has a first mounting hole 103 and a second mounting hole 104 for fixing the fiber Bragg grating temperature sensor 5.

[0031] The mounting fixture 1 is integrally formed. The clamping arms 102 on both sides of the mounting plate 101 are wavy, and the middle of the clamping arms 102 is used to fix the object to be measured. A linear fiber Bragg grating temperature sensor passes through the first mounting hole 103. The linear fiber Bragg grating temperature sensor is fixed between the outwardly protruding clamping arm and the object to be measured, and is used to measure the temperature of the side of the object. An L-shaped fiber Bragg grating temperature sensor passes through the second mounting hole 104. The L-shaped fiber Bragg grating temperature sensor is fixed between the mounting plate and the object to be measured, and is used to measure the temperature of the end face of the object. The fixture of this utility model adopts a clamping installation mechanism. In the operation process, the fiber optic temperature sensor is first inserted into the preset mounting hole of the fixture. The mounting hole and the sensor achieve a transition fit tolerance requirement to ensure the stability and accuracy of the connection between the two. Meanwhile, the wavy snap-fit ​​structure of the fixture, based on its elastic deformation characteristics, tightly adheres the linear sensor to the surface of the cathode rod under test. The snap-fit's clamping force firmly presses the sensor onto the cathode rod, effectively ensuring a close fit between the fiber optic temperature sensor, the fixture, and the cathode rod. For L-shaped sensors, the mechanical pressing action of the fixture directly ensures a tight fit to the end face of the cathode rod, achieving efficient temperature measurement. Both installation methods optimize the contact between the sensor and the object being measured, effectively increasing the contact area. These two different sensors address temperature measurement needs at different locations: the linear sensor measures the temperature of the side of the cathode rod, while the L-shaped sensor measures the temperature of the end face.

[0032] A connecting nut 105 is provided in the middle of the mounting plate 101. One end of the insulating rod 2 is threadedly connected to the connecting nut 105, fixing the insulating rod 2 to the side of the mounting plate 101 away from the clamping arm 102, for pushing the mounting clamp 1 onto the object to be measured. The mounting clamp 1 is made of aluminum alloy, which has a certain degree of toughness. The width of the arc-shaped inner tangent of the clamp is slightly smaller than the width of the object to be measured, which can achieve a stable clamping of objects of different sizes within the (±2.5mm) adaptation range. At the same time, the width of the arc of the front opening of the wavy clamp is significantly larger than the width of the object to be measured, and this arc-shaped opening design makes the clamp installation extremely convenient, allowing the clamp to be smoothly pushed onto the object to be measured with the help of the insulating rod. The clamp is easy to install, and even in a live environment, the sensor can still be disassembled and replaced without affecting the production schedule.

[0033] Example 2

[0034] A fiber Bragg grating temperature sensor temperature measurement system for an electrolytic aluminum tank includes the aforementioned drill-free mounting structure, as well as a fiber Bragg grating temperature sensor 5, a coupler 3, a fiber optic collection box 4, and an optical fiber demodulation system 6. The drill-free mounting structure attaches the fiber Bragg grating temperature sensor 5 to the surface of the cathode rod 8 of the electrolytic aluminum tank. Each fiber Bragg grating temperature sensor 5 is connected to the coupler 3 via a transmission optical cable 7, and multiple fiber Bragg grating temperature sensors 5 are coupled into a single sensor. The output end of the coupler 3 is connected to a single-core optical cable, which is then connected to the fiber optic collection box 4 and then output to the optical fiber demodulation system 6.

[0035] The fiber Bragg grating temperature sensor 5 includes two types: linear fiber Bragg grating temperature sensor and L-shaped fiber Bragg grating temperature sensor. Each fiber Bragg grating temperature sensor 5 includes a temperature probe 501, a temperature measuring section metal tube 502, an adapter 503, a pigtail 504, and an FC / APC jumper head 505. The temperature measuring section metal tube 502 is sleeved outside the temperature probe 501. The adapter 503 connects the temperature probe 501 and the pigtail 504. The other end of the pigtail 504 is connected to the FC / APC jumper head 505. The FC / APC jumper head 505 is connected to the transmission optical cable 7. A dust cap 506 is provided on the outside of the FC / APC jumper head 505. The temperature measuring section metal tube 502 is a 316 stainless steel metal tube. The top of the temperature measuring section metal tube 502 is a cylindrical stainless steel welded plug with an outer diameter of 2-3mm. The temperature measuring probe 501 is a temperature measuring optical fiber, which can be any one of quartz optical fiber, sapphire optical fiber, YAG crystal optical fiber, photonic crystal optical fiber, or high-temperature resistant optical fiber. The temperature-sensitive measuring points arranged on the optical fiber are fiber grating micro-nano fabricated structures. The fiber grating is 3-5mm long, and multiple measuring points can be arranged on a single sensor to achieve simultaneous multi-point detection without interference.

[0036] In this embodiment, the outer diameter of the metal tube in the temperature measuring section of the fiber optic temperature sensor is selected as 2-3 mm. The measurement range of the fiber optic temperature sensor is -50-800℃. During the fixing process along the electrolytic cell wall, it is necessary to ensure that the sensor is in close contact with the cathode rod. The mounting carrier of the fiber optic temperature sensor is a fiber collector box, which has high mechanical strength, is convenient for measurement and installation, and is stable and reliable. The number of fiber optic temperature sensors can be increased according to actual needs.

[0037] The fiber optic demodulation system 6 includes a computer 601, a demodulator 602, and an optical switch 603. The optical cables coming out of the fiber optic collection box 4 are connected to different optical switches 603 and output to the demodulator 602. The demodulator 602 is connected to the computer 601. The computer 601 has fiber optic temperature processing software. The demodulator 602 demodulates the temperature changes sensed by the fiber optic temperature sensor, receives the data through the computer, and displays the changes in the fiber optic temperature sensor readings through the software.

[0038] An electrolytic cell contains n cathode rods. Each cathode rod is clamped with a single-point sensor for temperature measurement using a separate clamp. The sensor can be installed on the front or side as required. The sensors on each cathode rod in the aluminum electrolysis cell are coupled together via couplers to form a single sensor output. The number of sensors is n, and the number of couplers is 1 m, where m > n and m is 2. a .

[0039] To facilitate the installation of the fiber optic temperature sensor, firstly, the metal tube of the sensor's temperature measuring section is passed through the holes in the clamp and pressed tightly against the inner wall of the clamp. Then, the FC / APC jumper on the sensor's pigtail is connected to a 1 / m coupler. A single-core optical cable is connected to the output of the 1 / m coupler on each electrolytic cell. The single-core optical cable is then connected to a fiber optic junction box, from which it extends to the fiber optic demodulation system. The optical cable extending from the junction box is connected to different optical switches. Depending on the requirements, different optical switch modes can be selected in the computer software to obtain temperature data for different electrolytic cells.

[0040] The fiber optic demodulator has a spectral range of 1515nm-1595nm. Each electrolytic cell has n cathode rods, and each cathode rod has one measurement point. Based on wavelength division multiplexing (WDM) technology, a 1dM coupler is used for output according to the number of cathode rods in the electrolytic cell. The output of each coupler is connected to a fiber optic collection box. This technology distributes different light wavelengths within a single channel. By switching between different channel sensors using optical switches on the demodulator and employing time division multiplexing (TDM) technology, the working status of the electrolytic cells on different optical switches can be observed on the computer demodulator software.

[0041] The specific installation method of the fiber optic temperature measurement system for the electrolytic aluminum tank in this embodiment is as follows:

[0042] (1) First, pass the sensor through the hole in the fixture and fix it against the inner tangent of the fixture;

[0043] (2) The sensor's fiber optic cable is connected to the input terminal of a 1-minute coupler via a jumper wire;

[0044] (3) The clamp is pushed into the cathode rod and clamped by the insulating rod that is threaded to the clamp;

[0045] (4) Connect the output optical cable of the coupler to the optical fiber hub box;

[0046] (5) Output the junction box signal to the demodulator via optical fiber;

[0047] (6) Connect the demodulator to the computer, select different optical switch modes from the computer, and observe the temperature readings of different electrolytic cells.

[0048] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hole-free mounting structure for a fiber optic grating temperature sensor in an electrolytic aluminum tank, characterized in that, The device includes a mounting clamp (1) and an insulating rod (2). The mounting clamp (1) is a U-shaped clamp. The mounting clamp (1) includes a mounting plate (101) and clamping arms (102) disposed on both sides of the mounting plate (101). One of the clamping arms (102) protrudes outward from the end near the mounting plate (101) to form a space for the fiber Bragg grating temperature sensor (5) to pass through. The mounting plate (101) has a first mounting hole (103) and a second mounting hole (104) for fixing the fiber Bragg grating temperature sensor (5).

2. The fiber optic grating temperature sensor mounting structure for an electrolytic aluminum tank without drilling, as described in claim 1, is characterized in that... The mounting fixture (1) is integrally formed, and the clamping arms (102) on both sides of the mounting plate (101) are wavy, with the middle of the clamping arms (102) on both sides used to fix the object to be measured.

3. The fiber optic grating temperature sensor mounting structure for an electrolytic aluminum tank without drilling, as described in claim 1, is characterized in that... The first mounting hole (103) is used to pass through a linear fiber optic temperature sensor, which is fixed between the outwardly protruding clamping arm and the object to be measured, and is used to measure the temperature on the side of the object to be measured.

4. The fiber optic grating temperature sensor mounting structure for an electrolytic aluminum tank without drilling, as described in claim 1, is characterized in that... The second mounting hole (104) is used to pass through the L-shaped fiber optic temperature sensor, which is fixed between the mounting plate and the object to be measured, and is used to measure the temperature of the end face of the object to be measured.

5. The fiber optic grating temperature sensor mounting structure for an electrolytic aluminum tank without drilling, as described in claim 1, is characterized in that... A connecting nut (105) is provided in the middle of the mounting plate (101), and one end of the insulating rod (2) is threadedly connected to the connecting nut (105) so that the insulating rod (2) is fixed on the side of the mounting plate (101) away from the clamp arm (102) and is used to push the mounting clamp (1) onto the object to be measured.

6. The fiber optic grating temperature sensor mounting structure for an electrolytic aluminum tank without drilling, as described in claim 1, is characterized in that... The mounting fixture (1) is made of aluminum alloy and has a certain degree of toughness.

7. A fiber optic grating temperature sensor temperature measurement system for an electrolytic aluminum tank, characterized in that, The device includes the non-drilling mounting structure as described in any one of claims 1-6, and further includes a fiber optic temperature sensor (5), a coupler (3), a fiber optic collection box (4), and a fiber optic demodulation system (6). The non-drilling mounting structure attaches the fiber optic temperature sensor (5) to the surface of the cathode rod (8) of the electrolytic aluminum tank. Each fiber optic temperature sensor (5) is connected to the coupler (3) via a transmission optical cable (7), and multiple fiber optic temperature sensors (5) are coupled into one sensor. The output end of the coupler (3) is connected to a single-core optical cable, which is connected to the fiber optic collection box (4) and then output to the fiber optic demodulation system (6).

8. The fiber optic grating temperature sensor temperature measurement system for an electrolytic aluminum tank according to claim 7, characterized in that, The fiber Bragg grating temperature sensor (5) includes two types: linear fiber Bragg grating temperature sensor and L-shaped fiber Bragg grating temperature sensor. Each type of fiber Bragg grating temperature sensor (5) includes a temperature probe (501), a temperature measuring section metal tube (502), an adapter (503), a pigtail (504), and an FC / APC jumper head (505). The temperature measuring section metal tube (502) is sleeved outside the temperature probe (501). The adapter (503) connects the temperature probe (501) and the pigtail (504). The other end of the pigtail (504) is connected to the FC / APC jumper head (505). The FC / APC jumper head (505) is connected to the transmission optical cable (7). A dust cap (506) is provided on the outside of the FC / APC jumper head (505).

9. The fiber optic grating temperature sensor temperature measurement system for an electrolytic aluminum tank according to claim 8, characterized in that, The temperature measuring section metal tube (502) is a stainless steel 316 metal tube. The top of the temperature measuring section metal tube (502) is a cylindrical stainless steel welded plug with an outer diameter of 2-3mm. The temperature measuring probe (501) is a temperature measuring optical fiber. The temperature measuring optical fiber can be any one of quartz optical fiber, sapphire optical fiber, YAG crystal optical fiber, photonic crystal optical fiber, or high temperature resistant optical fiber.

10. The fiber optic grating temperature sensor temperature measurement system for an electrolytic aluminum tank according to claim 7, characterized in that, The fiber optic demodulation system (6) includes a computer (601), a demodulator (602), and an optical switch (603). The optical cable from the fiber optic cable collection box (4) is connected to different optical switches (603) and output to the demodulator (602). The demodulator (602) is connected to the computer (601) and displays the reading of the fiber optic grating temperature sensor (5).

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