Aluminum leakage monitoring system for crystallizer of aluminum alloy casting machine and setting method

Abstract

According to the aluminum alloy casting machine crystallizer aluminum leakage monitoring system and the setting method, a temperature measuring ring is fixedly arranged on the lower portion of each crystallizer, a sensing optical fiber is sequentially wound on the outer circle face of each temperature measuring ring, and one end of the sensing optical fiber is connected with a temperature detection system; in the aluminum alloy deep well casting production process, the surface of a cast aluminum ingot radiates infrared rays to enable the temperature of the temperature measuring ring to rise, the sensing optical fiber detects the temperature of the temperature measuring ring, and accurate detection of the temperature of the outer surface of each aluminum ingot is indirectly achieved; before an aluminum leakage accident of the aluminum ingot occurs, the distance between the semi-solid high-temperature molten aluminum in the aluminum ingot and the surface of the aluminum ingot is reduced, and the surface temperature of the aluminum ingot rises, so that the temperature of the temperature measuring ring rises; when the sensing optical fiber detects that the temperature of the temperature measuring ring is abnormally increased, it is judged that an aluminum leakage accident possibly happens to the aluminum ingot, at the moment, measures are taken to enable the semi-solid area in the aluminum ingot to recover to the normal state again, and therefore the aluminum leakage accident is avoided; the system has the advantages of simple structure, few sensors, low cost, high reliability and simplicity in maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum alloy melting and casting, and particularly relates to an aluminum alloy casting machine mold leakage monitoring system and a setting method thereof. Background Art

[0002] In the deep-well casting and melting production of aluminum alloys, the molten high-temperature aluminum liquid enters the mold through the distribution flow plate and solidifies into a mold. The solidified aluminum ingot is pulled downward at a set speed by a dummy bar, and finally the required aluminum ingot is produced. During the above production process, if the solidification area of the molten high-temperature aluminum liquid in the mold is relatively thin, the high-temperature aluminum liquid may leak at the lower part of the mold. The leakage of the high-temperature aluminum liquid not only affects the forming quality of the aluminum ingot casting, but also, once a large amount of high-temperature aluminum liquid leaks into the coolant in the deep well, an explosion will occur due to the instantaneous generation of a large amount of steam, so it also seriously threatens the life safety of the operators.

[0003] To solve the above problems, the national invention patent with the application number 202411199056.4 discloses a mold leakage detection device for a mold, which includes a heat insulation ring installed at the bottom of a cooling water pipe, a mounting frame installed at the bottom of the heat insulation ring, an annular hose embedded in the mounting frame, and a pressure monitoring system for monitoring the air pressure of the annular hose. During the production of aluminum ingots, if high-temperature aluminum liquid leaks, the leaked high-temperature aluminum liquid will melt the annular hose, causing the annular hose to leak air. When the annular hose leaks air, its pressure will change. By detecting the change in the air pressure inside the annular hose with a sensor, the leakage situation of the high-temperature aluminum liquid can be detected, and then an alarm signal can be sent to take measures for treatment, reducing the production safety risk. However, the mold leakage detection device of this invention has a too complex structure, resulting in a high cost, and after each high-temperature aluminum liquid leakage accident, the mold leakage detection device needs to be replaced and repaired, thus increasing the use and maintenance costs.

[0004] The national invention patent with the application number 202410550303.4 discloses a molten aluminum leakage monitoring device during the casting process. The device includes several monitoring components arranged at the lower part of the mold. The monitoring component includes a connecting piece, a sensing piece, and a sensing element. The sensor is connected to the sensing piece. When the sensing piece comes into contact with the leaked high-temperature aluminum liquid, the sensor can trigger an alarm to monitor the phenomenon of molten aluminum leakage. The problem with the molten aluminum leakage monitoring device in this invention is that in order to improve the monitoring accuracy, multiple sensors need to be arranged on the sensing piece at the lower part of each mold. However, dozens of molds are often provided in the deep-well aluminum alloy casting equipment, resulting in a large number of sensors to be arranged (up to hundreds), making the cost of the molten aluminum leakage monitoring device during the casting process too high. Moreover, the connection of a large number of sensors to the monitoring terminal (PLC cabinet) also leads to low working reliability, and it is easy to have poor connection between the sensor and the monitoring terminal (the working environment of the sensor is relatively harsh), thus increasing the use and maintenance costs as well.

[0005] In addition, the above two invention patents can only trigger an alarm when a molten aluminum leakage accident occurs and cannot give an alarm before the molten aluminum leakage accident occurs. Therefore, the occurrence of the molten aluminum leakage accident cannot be completely prevented, so further improvement is needed. Summary of the Invention

[0006] In order to overcome the deficiencies in the background technology, the present invention discloses a molten aluminum leakage monitoring system and a setting method for a mold of an aluminum alloy casting machine to solve the problems of the existing molten aluminum leakage monitoring device in the background technology, such as complex structure, high cost, low reliability, high use and maintenance costs, and inability to give early warnings.

[0007] In order to achieve the above-mentioned invention purpose, the present invention adopts the following technical solutions: A molten aluminum leakage monitoring system for a mold of an aluminum alloy casting machine includes a distribution flow plate arranged at the upper part of the casting well. A number of shunt grooves are evenly arranged on the upper part of the distribution flow plate, and a number of pouring gates are symmetrically arranged on both sides of the shunt grooves. A mold is fixedly arranged corresponding to the lower part of each pouring gate. A temperature measuring ring is fixedly arranged at the lower part of each mold, and a sensing optical fiber is sequentially wound around the outer circumferential surface of each temperature measuring ring. One end of the sensing optical fiber is connected to a temperature detection system.

[0008] Furthermore, the number of turns of the sensing optical fiber wound around the mold is more than one turn.

[0009] Furthermore, the other end of the sensing optical fiber is arranged in a constant temperature box, or a section of the sensing optical fiber between the distribution flow plate and the temperature detection system is arranged in a constant temperature box.

[0010] Furthermore, the length of the sensing optical fiber arranged in the constant temperature box is more than 20 meters.

[0011] Further, an optical fiber groove is provided on the outer circumferential surface of the temperature measuring ring. An R angle is provided at the root of the optical fiber groove, and the radius of the R angle is 5.0 - 10.0 mm; the sensing optical fiber is wound in the optical fiber groove.

[0012] Further, the material of the temperature measuring ring is Invar steel.

[0013] Further, a heat insulation ring is provided between the mold and the temperature measuring ring.

[0014] Preferably, a cooling water ring and a heat insulation ring are sequentially provided between the mold and the temperature measuring ring.

[0015] Preferably, a cooling water ring is fixedly provided at the lower part of the temperature measuring ring; a heat insulation ring is provided between the temperature measuring ring, the mold and the cooling water ring.

[0016] A setting method for a molten aluminum leakage monitoring system of an aluminum alloy casting machine mold. A sensing optical fiber is wound in the optical fiber grooves of each temperature measuring ring in sequence; before winding the sensing optical fiber on the outer circumferential surface of the temperature measuring ring, a layer of paraffin wax with a thickness of 0.1 - 0.3 mm is coated on the surface of the optical fiber groove of the temperature measuring ring; after the winding of the sensing optical fiber is completed, paraffin wax is coated again to fix the sensing optical fiber; the sensing optical fiber between adjacent temperature measuring rings is in a relaxed state; one end of the sensing optical fiber is connected to a temperature detection system, and the other end of the sensing optical fiber with a length of not less than 20 meters is arranged in a constant temperature box; or the sensing optical fiber with a length of 20 meters between the distribution manifold and the temperature detection system is arranged in a constant temperature box.

[0017] Due to the adoption of the above - mentioned technical solution, the present invention has the following beneficial effects: The molten aluminum leakage monitoring system and the setting method of an aluminum alloy casting machine mold disclosed by the present invention fixedly set a temperature measuring ring at the lower part of each mold, and a sensing optical fiber is wound on the outer circumferential surface of each temperature measuring ring in sequence, and one end of the sensing optical fiber is connected to a temperature detection system; during the production process of deep - well casting of aluminum alloy, the infrared rays radiated from the surface of the aluminum ingot increase the temperature of the temperature measuring ring. By detecting the temperature of the temperature measuring ring through the sensing optical fiber, the accurate detection of the temperature of the outer surface of each aluminum ingot is indirectly realized; before a possible molten aluminum leakage accident occurs to a certain aluminum ingot, the distance between the semi - solid high - temperature aluminum liquid inside the aluminum ingot and the surface of the aluminum ingot will decrease, thereby increasing the surface temperature of the aluminum ingot. The increase in the surface temperature of the aluminum ingot will also increase the temperature of the temperature measuring ring. When the sensing optical fiber detects an abnormal increase in the temperature of the temperature measuring ring, it can be judged that a possible molten aluminum leakage accident may occur to the aluminum ingot. At this time, by controlling to reduce the traction speed of the dummy bar pulling machine or increasing the cooling water flow rate, the cooling time of the aluminum ingot can be extended or the cooling speed can be increased, so that the semi - solid high - temperature aluminum liquid area inside the aluminum ingot returns to the normal state again, thereby avoiding the occurrence of a molten aluminum leakage accident; the molten aluminum leakage monitoring system of the aluminum alloy casting machine mold of the present invention has the advantages of simple structure, small number of sensors, low cost, high reliability, simple maintenance, and can give an early warning of molten aluminum leakage accidents, laying a solid technical foundation for the popularization and application of the molten aluminum leakage monitoring system of the aluminum alloy casting machine mold. Description of the Drawings

[0018] Figure 1 It is the upper appearance view of the distribution runner plate; Figure 2 It is the lower appearance view of the distribution runner plate; Figure 3 It is the schematic diagram of the principle of the molten aluminum leakage monitoring system for the crystallizer of an aluminum alloy casting machine Figure 1 ; Figure 4 It is the schematic diagram of the principle of the molten aluminum leakage monitoring system for the crystallizer of an aluminum alloy casting machine Figure 2 ; Figure 5 It is the schematic diagram of the appearance of the temperature measuring ring; Figure 6 It is the side view of the distribution runner plate; Figure 7 It is Figure 6 The enlarged schematic diagram of the partial section A in Figure 8 It is the enlarged schematic diagram of the partial section of the second embodiment; Figure 9 It is the enlarged schematic diagram of the partial section of the third embodiment; Figure 10 It is the schematic diagram of the internal tissue distribution state before the molten aluminum leakage accident of the aluminum ingot; In the figure: 1. Distribution runner plate; 1.1. Shunt groove; 1.2. Gate; 2. Crystallizer; 3. Heat insulation ring; 4. Temperature measuring ring; 4.1. Temperature measuring ring body; 4.1.1. Optical fiber groove; 4.2. Temperature measuring ring flange; 5. Sensing optical fiber; 6. Temperature detection system; 6.1. Laser light source; 6.2. Wavelength division multiplexer; 6.3. APD photoelectric converter; 6.4. Data acquisition card; 6.5. Data processing device; 6.6. Alarm device; 7. Constant temperature box; 8. Cooling water ring; 9. High-temperature aluminum liquid; 10. Semi-solid high-temperature aluminum liquid; 11. Aluminum ingot Specific implementation manners

[0019] The present invention can be explained in detail through the following embodiments, and the purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0020] Embodiment 1. Refer to the attached drawings of the specification Figure 1 , 2 : An aluminum alloy casting machine crystallizer molten aluminum leakage monitoring system includes a distribution runner plate 1 arranged at the upper part of the casting well; a plurality of shunt grooves 1.1 are uniformly arranged on the upper part of the distribution runner plate 1, and a plurality of through gates 1.2 are symmetrically arranged on both sides of the shunt grooves 1.1. A crystallizer 2 is fixedly arranged below each gate 1.2; a temperature measuring ring 4 is fixedly arranged below each crystallizer 2; Refer to the attached drawings of the specification Figure 3 , 4: A sensing optical fiber 5 is successively wound around the outer circumferential surface of each temperature measurement ring 4. One end of the sensing optical fiber 5 is connected to a temperature detection system 6, and the other end of the sensing optical fiber 5 with a length of not less than 20 meters is arranged in a constant temperature box 7. In the aluminum alloy casting machine mold leakage aluminum monitoring system, the purpose of arranging the other end of the sensing optical fiber 5 in the constant temperature box 7 is to conduct an experimental calibration of the measured temperature reference before the aluminum alloy casting machine mold leakage aluminum monitoring system is set up and formally used. Additionally, the constant temperature box 7 can also be arranged 200 meters away from the temperature detection system 6 (the length of the sensing optical fiber 5), and the length of the sensing optical fiber 5 in the constant temperature box 7 is 20 meters. In the above arrangement of the sensing optical fiber 5, the length of the sensing optical fiber 5 wound around each temperature measurement ring 4 and the distance between each temperature measurement ring 4 are known. Therefore, the distance between the sensing optical fiber 5 wound around each temperature measurement ring 4 and the temperature detection system 6 is also known. See the appended description Figure 5 : The temperature measurement ring 4 includes a ring-shaped temperature measurement ring body 4.1. Temperature measurement ring flanges 4.2 are provided at both ends of the temperature measurement ring body 4.1. An optical fiber groove 4.1.1 is provided on the outer circumferential surface of the temperature measurement ring body 4.1. An R corner is provided at the root of the optical fiber groove 4.1.1, and the radius of the R corner is 8 mm. The sensing optical fiber 5 is wound around the optical fiber groove 4.1.1 of the temperature measurement ring 4, and the number of winding turns is more than one turn, which is specifically determined by the spatial resolution of the temperature detection system 6 and the outer diameter of the optical fiber groove 4.1.1. The specific calculation formula is Q = R / (πD), where Q is the number of winding turns of the sensing optical fiber 5 on the temperature measurement ring 4 (the result needs to be rounded up to an integer according to the calculation result, and those less than one turn should be made up to one turn), R is the spatial resolution of the temperature detection system 6, and D is the outer diameter of the optical fiber groove 4.1.1. For example, when the spatial resolution of the temperature detection system 6 is 1.0 meter and the outer diameter of the optical fiber groove 4.1.1 is 0.6 mm, the length of the sensing optical fiber 5 wound around the optical fiber groove 4.1.1 for each turn is 1.884 meters. Therefore, the number of winding turns of the sensing optical fiber 5 on the temperature measurement ring 4 is 2 turns. The material of the temperature measurement ring 4 is made of invar steel, and the thermal expansion coefficient of invar steel is extremely small, which can prevent the temperature measurement ring 4 from expanding and deforming due to heat during operation, so that the sensing optical fiber 5 wound around its outer circumference generates tensile stress and affects the accuracy of temperature measurement. See the appended description Figure 6 、 7 : The temperature measurement ring 4 is fixedly arranged at the lower part of the mold 2. An insulating ring 3 is arranged between the temperature measurement ring 4 and the mold 2. The insulating ring 3 prevents the heat of the mold 2 from being transferred to the temperature measurement ring 4, which affects the accuracy of the temperature measurement of the sensing optical fiber 5. See the appended description Figure 3 、 4: The temperature detection system 6 includes a laser light source 6.1, a wavelength division multiplexer 6.2, an APD photoelectric converter 6.3, a data acquisition card 6.4, a data processing device 6.5, and an alarm device 6.6; the laser light source 6.1, the wavelength division multiplexer 6.2, and the APD photoelectric converter 6.3 are connected by optical fibers, the APD photoelectric converter 6.3 and the data acquisition card 6.4 are connected by wires, and the laser light source 6.1, the data acquisition card 6.4, the data processing device 6.5, and the alarm device 6.6 are connected by wires; one end of the sensing optical fiber 5 is connected to the wavelength division multiplexer 6.2; the working principle of the temperature detection system 6 is: the laser light source 6.1 emits laser pulses and sends them into the wavelength division multiplexer 6.2, and the wavelength division multiplexer 6.2 couples the pulsed laser into the sensing optical fiber 5; when the sensing optical fiber 5 is placed in a temperature field, the laser pulses will be scattered at each point of the sensing optical fiber 5, and the scattered light will be transmitted back along the sensing optical fiber 5 to the wavelength division multiplexer 6.2, and the wavelength division multiplexer 6.2 will filter out most of the Rayleigh scattered light and Brillouin scattered light that are scattered back, and the remaining Raman scattered light will be separated into Stokes light and anti-Stokes light; the two separated beams of Stokes light and anti-Stokes light are respectively input into two channels of the APD photoelectric converter 6.3 for photoelectric conversion, and the converted electrical signals are transmitted to the data acquisition card 6.4 for analog-to-digital conversion to become digital signals, and the digital signals are input into the data processing device 6.5, and after demodulation algorithms and noise reduction processing, the temperature information distributed along the length direction of the sensing optical fiber 5 is measured; and the distance between the sensing optical fiber 5 wound on each temperature measurement ring 4 and the temperature detection system 6 (i.e., the distance along the length direction of the sensing optical fiber 5) is known, so the temperature of the sensing optical fiber 5 wound on each temperature measurement ring 4 can be obtained according to the measured temperature information along the length direction of the sensing optical fiber 5; the data processing device 6.5 determines whether a leakage accident of a certain aluminum ingot 11 may occur by detecting an abnormal increase in the temperature of the sensing optical fiber 5 wound on each temperature measurement ring 4 and exceeding a set threshold; when the data processing device 6.5 detects that a leakage accident of a certain aluminum ingot 11 may occur, it will control the alarm device 6.6 to emit an audible and visual alarm signal to notify the operator to process it in time; The leakage aluminum monitoring system for the crystallizer of the aluminum alloy casting machine of the present invention can be realized by arranging the temperature measurement rings 4 and the sensing optical fibers 5 at the lower part of the existing aluminum alloy casting machine crystallizer. Therefore, it has many advantages such as simple structure, small number of sensors, low cost, high reliability, and simple maintenance, and is convenient for popularization and use in aluminum alloy casting machines.

[0021] The working process of the molten aluminum leakage monitoring system for the crystallizer of an aluminum alloy casting machine is as follows: When the aluminum alloy casting machine is working, the molten high-temperature aluminum liquid flows into the crystallizer 2 through the shunt groove 1.1 and the gate 1.2 of the distribution flow plate 1, and is cooled and solidified into a mold in the crystallizer 2. The solidified aluminum ingot is pulled downward at a set speed by the dummy bar puller to produce the required aluminum ingot 11. The surface of the aluminum ingot 11 just pulled out from the crystallizer 2 still has a relatively high temperature, which radiates infrared rays outward, causing the temperature of the temperature measuring ring 4 to rise. The temperature of each temperature measuring ring 4 measured by the sensing optical fiber 5 indirectly realizes the accurate detection of the temperature of the outer surface of each aluminum ingot 11. See the attached instruction manual Figure 10 : Before a possible molten aluminum leakage accident occurs to a certain aluminum ingot 11, the area of the semi-solid high-temperature aluminum liquid 10 inside the aluminum ingot will expand and extend downward. Therefore, the distance between the semi-solid high-temperature aluminum liquid 10 and the surface of the aluminum ingot 11 will decrease, resulting in an increase in the surface temperature of the aluminum ingot 11. The increase in the surface temperature of the aluminum ingot 11 will also cause the temperature of the temperature measuring ring 4 to rise. When the sensing optical fiber 5 detects that the temperature of the temperature measuring ring 4 rises abnormally and exceeds the set threshold, it can be judged that a possible molten aluminum leakage accident may occur to the aluminum ingot 11. At this time, by controlling to reduce the pulling speed of the dummy bar puller or increasing the cooling water flow rate in the crystallizer 2, by extending the cooling time or accelerating the cooling speed of the aluminum ingot 11, the area of the semi-solid high-temperature aluminum liquid 10 inside the aluminum ingot 11 is reduced and restored to the normal state, thus avoiding the occurrence of a molten aluminum leakage accident.

[0022] Example 2, see the attached instruction manual Figure 8 : In this embodiment, a cooling water ring 8 is additionally provided between the crystallizer 2 and the temperature measuring ring 4 to further cool the aluminum ingot 11 pulled out from the crystallizer 2 to prevent a molten aluminum leakage accident.

[0023] Example 3, see the attached instruction manual Figure 9 : In this embodiment, the temperature measuring ring 4 is arranged between the crystallizer 2 and the cooling water ring 8, and heat insulation rings 3 are arranged between the temperature measuring ring 4 and the crystallizer 2 and the cooling water ring 8 respectively. This setting position of the temperature measuring ring 4 can prevent the cooling water sprayed out by the cooling water ring 8 from affecting the temperature measuring ring 4, thereby further improving the accuracy of the surface temperature measurement of the aluminum ingot 11.

[0024] A setting method for the molten aluminum leakage monitoring system of the crystallizer of an aluminum alloy casting machine: The temperature measuring ring 4 is fixedly arranged at the lower part of the crystallizer 2 in the manners of Embodiment 1, Embodiment 2 and Embodiment 3; A sensing optical fiber 5 is wound in the optical fiber grooves 4.1.1 of each temperature measuring ring 4 in sequence; Before winding the sensing optical fiber 5 on the outer circumferential surface of the temperature measuring ring 4, a layer of paraffin wax with a thickness of 0.2 mm is coated on the surface of the optical fiber groove 4.1.1 of the temperature measuring ring 4. This layer of paraffin wax creates a gap between the sensing optical fiber 5 and the surface of the optical fiber groove 4.1.1. This gap prevents the temperature measuring ring 4 from expanding and deforming due to heat during operation, and avoids generating tensile stress on the sensing optical fiber 5 wound on the outer circumference of the optical fiber groove 4.1.1, which affects the accuracy of temperature measurement; In addition, this gap can also compensate for the change in the distance between adjacent crystallizers 2 during the operation of the aluminum alloy casting machine crystallizer, and avoid generating tensile stress on the sensing optical fiber 5 between adjacent crystallizers 2, which affects the accuracy of temperature measurement; Moreover, when the temperature measuring ring 4 is in operation, the paraffin wax layer will melt and flow downward due to heat. When the paraffin wax layer flows downward, the sensing optical fiber 5 will move downward together with the paraffin wax layer, so that the sensing optical fiber 5 wound in the optical fiber groove 4.1.1 falls on the R corner at the lower side root of the optical fiber groove 4.1.1, ensuring good contact between the sensing optical fiber 5 and the temperature measuring ring 4, thereby ensuring the accuracy of the temperature detected by the sensing optical fiber 5; After the sensing optical fiber 5 finishes winding in the optical fiber groove 4.1.1 of a temperature measuring ring 4, paraffin wax is coated again to fix the sensing optical fiber 5, preventing the tightness of the sensing optical fiber 5 wound on the previous temperature measuring ring 4 from being affected when winding the sensing optical fiber 5 on the next temperature measuring ring 4; When winding the sensing optical fiber 5 on the temperature measuring ring 4, the sensing optical fiber 5 between adjacent temperature measuring rings 4 is in a relaxed state, avoiding the change in the distance between adjacent crystallizers 2 during the operation of the aluminum alloy casting machine crystallizer, and avoiding generating tensile stress on the sensing optical fiber 5 between adjacent crystallizers 2, which affects the accuracy of temperature measurement; One end of the sensing optical fiber 5 is arranged in the constant temperature box 7 with a length of not less than 20 meters, and the other end is connected to the temperature detection system 6; The constant temperature box 7 and the detection system 6 are both arranged in the control room.

[0025] Preferably, another setting method for the molten aluminum leakage monitoring system of the aluminum alloy casting machine crystallizer is to arrange the 20-meter-long sensing optical fiber 5 between the distribution flow plate 1 and the temperature detection system 6 in the constant temperature box 7.

[0026] The parts not described in detail in the present invention are the prior art.

Claims

1. An aluminum alloy casting machine mold leakage monitoring system, including a distribution flow plate (1) arranged at the upper part of the casting well; a number of shunt grooves (1.1) are evenly arranged on the upper part of the distribution flow plate (1), and a number of gate openings (1.2) are symmetrically arranged on both sides of the shunt grooves (1.1), and a mold (2) is fixedly arranged corresponding to the lower part of each gate opening (1.2); characterized in that: A temperature measuring ring (4) is fixedly arranged at the lower part of each crystallizer (2), and a sensing optical fiber (5) is successively wound around the outer circumferential surface of each temperature measuring ring (4); one end of the sensing optical fiber (5) is connected to a temperature detection system (6).

2. The aluminum alloy casting machine mold leakage monitoring system according to claim 1, characterized in that: The number of turns of the sensing optical fiber (5) wound around the crystallizer (2) is more than one turn.

3. The aluminum alloy casting machine mold leakage monitoring system according to claim 1, characterized in that: The other end of the sensing optical fiber (5) is arranged in a constant temperature box (7), or a section of the sensing optical fiber (5) between the distribution flow plate (1) and the temperature detection system (6) is arranged in the constant temperature box (7).

4. The aluminum alloy casting machine mold leakage monitoring system according to claim 2, characterized in that: The length of the sensing optical fiber (5) arranged in the constant temperature box (7) is more than 20 meters.

5. The aluminum alloy casting machine mold leakage monitoring system according to claim 1, characterized in that: An optical fiber groove (4.1.1) is arranged on the outer circumferential surface of the temperature measuring ring (4), and an R corner is arranged at the root of the optical fiber groove (4.1.1), and the radius of the R corner is 5-10 mm; the sensing optical fiber (5) is wound in the optical fiber groove (4.1.1).

6. The aluminum alloy casting machine mold leakage monitoring system according to claim 1, characterized in that: The material of the temperature measuring ring (4) is Invar steel.

7. The aluminum alloy casting machine crystallizer aluminum leakage monitoring system according to claim 1, characterized in that: A heat insulation ring (3) is arranged between the crystallizer (2) and the temperature measuring ring (4).

8. The aluminum alloy casting machine mold leakage monitoring system according to claim 1, characterized in that: A cooling water ring (8) and a heat insulation ring (3) are successively arranged between the crystallizer (2) and the temperature measuring ring (4).

9. The aluminum alloy casting machine mold leakage monitoring system according to claim 1, characterized in that: A cooling water ring (8) is fixedly arranged at the lower part of the temperature measuring ring (4); a heat insulation ring (3) is arranged between the temperature measuring ring (4), the crystallizer (2) and the cooling water ring (8).

10. A setting method for the aluminum leakage monitoring system of the crystallizer of the aluminum alloy casting machine according to claim 5, characterized in that: One sensing optical fiber (5) is successively wound in the optical fiber groove (4.1.1) of each temperature measuring ring (4); before the sensing optical fiber (5) is wound around the outer circumferential surface of the temperature measuring ring (4), a layer of paraffin with a thickness of 0.1-0.3 mm is coated on the surface of the optical fiber groove (4.1.1) of the temperature measuring ring (4); after the winding of the sensing optical fiber (5) is completed, paraffin is coated again to fix the sensing optical fiber (5); the sensing optical fiber (5) between adjacent temperature measuring rings (4) is in a relaxed state; one end of the sensing optical fiber (5) is connected to the temperature detection system (6), and the other end is arranged in the constant temperature box (7) with a length of not less than 20 meters; or a 20-meter-long sensing optical fiber (5) between the distribution flow plate (1) and the temperature detection system (6) is arranged in the constant temperature box (7).

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