Crucible liquid level height measuring method and crucible liquid level height measuring device

Abstract

The invention relates to the technical field of nano metal production, and particularly discloses a crucible liquid level height measuring method and a crucible liquid level height measuring device.The crucible liquid level height measuring method comprises the following steps that a cooling jacket is arranged outside a crucible, cooling water is introduced, after the water amount is stable, the crucible and the cooling jacket are weighed through a sensor, and the crucible liquid level height is measured; obtaining a weight value a; equipment works, evaporation of the metal raw materials is reduced, and a real-time weight value c is obtained; and according to the formula, the liquid level remaining height = ((c-a) / liquid metal density) / crucible bottom area, the liquid level remaining height in the crucible is calculated, and the feeding time is judged according to the liquid level remaining height. The crucible liquid level height measuring device comprises a vacuum container, a crucible and a weighing sensor are arranged in the vacuum container, and the crucible is placed above the weighing sensor. The metal powder manufacturing device has the effect of accurately judging the feeding time when metal powder is manufactured.

Description

Technical Field

[0001] The present application relates to the technical field of nano-metal production, and in particular to a method and device for measuring the liquid level of a crucible. Background Art

[0002] The arc method is a common method for producing nanometal powders. Its core principle is to utilize the high temperature generated by an electric arc to melt and evaporate the metal raw material in a crucible. The resulting metal vapor condenses to form the desired powder. During continuous production in this high-temperature vacuum environment, the molten metal is continuously evaporated and consumed, and the liquid level gradually decreases, necessitating timely replenishment of raw materials to ensure process continuity and powder quality.

[0003] Because the crucible is at extremely high temperatures and the vacuum chamber is filled with evaporating metal powder, it's difficult to visually determine when to feed the material. Currently, common technologies use ultrasonic or laser distance sensors to measure the liquid level. However, the structural limitations of the vacuum vessel, the potential inclination of the liquid surface, and the radiation and reflection interference generated by the high-temperature metal surface all affect the transmission, reception, and interpretation accuracy of the ultrasonic or laser signals, resulting in unreliable measurement results.

[0004] Therefore, there is an urgent need to develop a new method and device that can overcome the interference of high temperature, vacuum and metal vapor, and achieve relatively highly reliable and relatively accurate measurement of the molten metal level in the crucible, so as to relatively accurately judge the feeding timing and ensure the continuous and efficient operation of nano-metal powder production. Summary of the Invention

[0005] In order to accurately determine the feeding timing when making metal powder, the present application provides a crucible liquid level height measurement method and a crucible liquid level height measurement device.

[0006] In a first aspect, the present application provides a method for measuring the liquid level of a crucible, which adopts the following technical solution: A method for measuring a crucible liquid level comprises the following steps: Q1. Set a cooling jacket outside the crucible and pass cooling water into it. After the water volume stabilizes, weigh the crucible and cooling jacket through a sensor to obtain the weight value a; Q2. Add the metal raw material into the crucible and obtain the weight value b; Q3: The equipment is working, the evaporation of the metal raw material decreases, and the real-time weight value c is obtained; Q4. According to the formula, the remaining height of the liquid level = ((ca) ÷ liquid metal density) ÷ crucible bottom area, calculate the remaining height of the liquid level in the crucible; Q5. Determine the feeding time based on the remaining height of the liquid level.

[0007] By adopting the above technical solution, the weight change of the metal raw material is obtained through the weight change difference of the equipment, thereby indirectly measuring the change in the liquid level and judging the timing of feeding. This avoids the distance, angle, reflection and other problems that ultrasonic and laser measurement methods rely on, and realizes the accurate judgment of feeding timing when making metal powder.

[0008] Optionally, in step Q1, the flow rate of cooling water is 10-20 L / min.

[0009] Optionally, in step Q2, the total height of the liquid level in the crucible after feeding = ((ba) ÷ density of liquid metal) ÷ ​​area of ​​the bottom of the crucible.

[0010] Optionally, there are multiple sensors, and the weight value a, weight value b and real-time weight value c are all the sum of the readings of multiple sensors.

[0011] By adopting the above technical solution and using multiple sensors for weighing, the accuracy of the data can be improved.

[0012] In a second aspect, the present application provides a crucible liquid level measuring device, which adopts the following technical solution: A crucible liquid level measuring device comprises a vacuum container. A crucible and a weighing sensor are arranged in the vacuum container. The crucible is placed above the weighing sensor. A second cooling jacket is provided on the crucible.

[0013] Optionally, a first cooling jacket is provided on the weighing sensor, a first water inlet pipe is provided on one side of the first cooling jacket, and a first water outlet pipe is provided on the other side of the first cooling jacket.

[0014] By adopting the above technical solution, the weighing sensor is protected by water cooling, thereby increasing the service life of the sensor.

[0015] Optionally, a second water inlet pipe is provided on one side of the second cooling jacket, and a second water outlet pipe is provided on the other side of the second cooling jacket.

[0016] Optionally, a plurality of guide plates are provided in the second cooling jacket, and the guide plates are arranged at intervals.

[0017] Optionally, the guide plates are provided with guide ports, and the guide ports on two adjacent guide plates are located on different sides of the crucible.

[0018] By adopting the above technical solution, the arrangement of the guide plate enables the cooling water to flow fully in the second cooling jacket, thereby improving the cooling effect on the crucible.

[0019] Optionally, the surface roughness of the contact surface between the weighing sensor and the first cooling jacket is not greater than 0.025 μm, and the surface roughness of the contact surface between the first cooling jacket and the weighing sensor is not greater than 0.025 μm.

[0020] By adopting the above technical solution, the contact surface between the weighing sensor and the first cooling jacket should be as smooth as possible, thereby reducing the friction between the weighing sensor and the first cooling jacket and reducing the influence of the friction on the weighing sensor reading.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. The weight change of the metal raw material is obtained through the weight change difference of the equipment, thereby indirectly measuring the change in the height of the liquid level and judging the timing of feeding. This avoids the distance, angle, reflection and other problems that ultrasonic and laser measurement methods rely on, and realizes the accurate judgment of feeding timing when making metal powder; 2. Protect the weighing sensor through water cooling, which increases the service life of the sensor; 3. The setting of the guide plate allows the cooling water to flow fully in the second cooling jacket, thereby improving the cooling effect on the crucible. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a crucible liquid level measuring device in an embodiment of the present application.

[0023] Explanation of the accompanying drawings: 1. Vacuum container; 2. Crucible; 3. Weighing sensor; 4. Support shaft; 5. First cooling jacket; 6. Support rod; 7. First water inlet pipe; 8. First water outlet pipe; 9. Second cooling jacket; 10. Second water inlet pipe; 11. Second water outlet pipe; 12. Conductive tube; 13. Guide plate; 14. Guide port. DETAILED DESCRIPTION

[0024] The following is combined with Figure 1 This application is described in further detail.

[0025] Example 1

[0026] The embodiment of the present application discloses a crucible liquid level measuring device.

[0027] Reference Figure 1A crucible liquid level measuring device includes a vacuum container 1 and a crucible 2. The interior of the vacuum container 1 is sealed and in a vacuum state, and the crucible 2 is located in the vacuum container 1. A weighing sensor 3 is provided in the vacuum container 1, and the weighing sensor 3 is located at the bottom of the vacuum container 1. The weighing sensor 3 includes a support shaft 4, which is vertically arranged on the top of the weighing sensor 3. The surface roughness of the side wall of the support shaft 4 is not greater than 0.025μm. In this embodiment, the number of weighing sensors 3 is four, and the support shafts 4 are located at the four corners of the bottom of the crucible 2.

[0028] Reference Figure 1 A first cooling jacket 5 is provided within the vacuum container 1. The first cooling jacket 5 is mounted on four support shafts 4 and is used to cool the load cell 3. Four support rods 6 are provided at the bottom of the first cooling jacket 5. The support rods 6 are located at the four corners of the first cooling jacket 5 and are fixedly connected to the first cooling jacket 5. One end of the support rods 6 is placed at the bottom of the vacuum container 1.

[0029] Reference Figure 1 A first water inlet pipe 7 is provided on one side of the first cooling jacket 5, and a first water outlet pipe 8 is provided on the other side of the first cooling jacket 5. One end of the first water inlet pipe 7 passes through the side wall of the first cooling jacket 5, the first water inlet pipe 7 is sealedly connected to the first cooling jacket 5, and the interior of the first water inlet pipe 7 is communicated with the interior of the first cooling jacket 5. The end of the first water inlet pipe 7 away from the first cooling jacket 5 passes through the bottom of the vacuum container 1, and the first water inlet pipe 7 is sealedly connected to the vacuum container 1. One end of the first water outlet pipe 8 passes through the side wall of the first cooling jacket 5, the first water outlet pipe 8 is sealedly connected to the first cooling jacket 5, and the interior of the first water outlet pipe 8 is communicated with the interior of the first cooling jacket 5. The end of the first water outlet pipe 8 away from the first cooling jacket 5 passes through the bottom of the vacuum container 1, and the first water outlet pipe 8 is sealedly connected to the vacuum container 1.

[0030] Reference Figure 1A second cooling jacket 9 is provided on the crucible 2, which wraps around the sidewalls and bottom of the crucible 2. One end of the support shaft 4 contacts the bottom of the second cooling jacket 9. A second water inlet pipe 10 is provided on one side of the second cooling jacket 9, and a second water outlet pipe 11 is provided on the other side of the second cooling jacket 9. One end of the second water inlet pipe 10 passes through the sidewall of the second cooling jacket 9, and the second water inlet pipe 10 is sealedly connected to the second cooling jacket 9. The interior of the second water inlet pipe 10 communicates with the interior of the second cooling jacket 9. The end of the second water inlet pipe 10 away from the second cooling jacket 9 passes through the bottom of the vacuum container 1, and the second water inlet pipe 10 is sealedly connected to the vacuum container 1. One end of the second water outlet pipe 11 passes through the sidewall of the second cooling jacket 9, and the second water outlet pipe 11 is sealedly connected to the second cooling jacket 9. The interior of the second water outlet pipe 11 communicates with the interior of the second cooling jacket 9. The end of the second water outlet pipe 11 away from the second cooling jacket 9 passes through the bottom of the vacuum container 1, and the second water outlet pipe 11 is sealedly connected to the vacuum container 1. The second water inlet pipe 10 and the second water outlet pipe 11 are both flexible metal hoses.

[0031] Reference Figure 1 A conductive tube 12 is provided on one side of the second cooling jacket 9. In this embodiment, the conductive tube 12 is located below the second water outlet pipe 11. One end of the conductive tube 12 is fixedly connected to the conductive connection port of the second cooling jacket 9. The other end of the conductive tube 12 extends through the bottom of the vacuum vessel 1, where it is sealed to the vacuum vessel 1. In this embodiment, the conductive tube 12 is a braided soft copper busbar.

[0032] Reference Figure 1 The second cooling jacket 9 is provided with a plurality of guide plates 13. The guide plates 13 surround the crucible 2, with both sides of the guide plates 13 fixedly connected to the sidewalls of the second cooling jacket 9. The guide plates 13 are arranged horizontally and spaced vertically, with the spacing between adjacent guide plates 13 being equal. The guide plates 13 are provided with guide openings 14, which are vertical openings. The guide openings 14 on adjacent guide plates 13 are located on opposite sides of the crucible 2.

[0033] The application example of this application discloses a method for measuring the liquid level of a crucible.

[0034] Application Example 1 Application Example 1 is performed in a crucible liquid level measurement device disclosed in the embodiment, comprising the following steps: S1. Cooling water is introduced into the first cooling jacket 5 through the first water inlet pipe 7. At the same time, cooling water is introduced into the second cooling jacket 9 through the second water inlet pipe 10. The flow rate is maintained at 10 L / min. After the water levels in the first cooling jacket 5 and the second cooling jacket 9 stabilize, the readings of the load cells 3 are read. The sum of the readings of the four load cells 3 is calculated and recorded as weight A. In this application example, weight A = 20 kg. S2. Add a metal raw material into the crucible 2. In this application example, the metal raw material is a lump of iron. Read the readings of the load cells 3. Calculate the sum of the readings of the four load cells 3 and record it as weight B. In this application example, weight B = 45 kg. S3. Metal powder is produced by an arc method. The metal raw material is melted into a liquid state. Subsequently, evaporation decreases and the liquid level drops. The readings of the weighing sensors 3 are continuously read. The sum of the readings of the four weighing sensors 3 is calculated and recorded as the real-time weight C. S4. Calculate the remaining height of the liquid in crucible 2 according to the formula: Remaining height of liquid level = total height - height of liquid level drop = ((CA) ÷ density of liquid metal) ÷ ​​area of ​​crucible bottom. When the remaining height of the liquid level approaches 3 cm, start adding metal raw material. In this application example, the liquid density of the metal raw material is 7.138 g / cm³, the radius of the crucible 2 is 15 cm, and when the real-time weight C is close to 3×π×15 2 ×7.138+20000=35129g≈35.2kg, start replenishing metal raw materials.

[0035] Application Example 2 Application Example 2 is performed in a crucible liquid level measurement device disclosed in the embodiment, comprising the following steps: S1. Cooling water is introduced into the first cooling jacket 5 through the first water inlet pipe 7. At the same time, cooling water is introduced into the second cooling jacket 9 through the second water inlet pipe 10. The flow rate is maintained at 20 L / min. After the water levels in the first cooling jacket 5 and the second cooling jacket 9 stabilize, the readings of the load cells 3 are read. The sum of the readings of the four load cells 3 is calculated and recorded as weight A. In this application example, weight A = 25 kg. S2. Add a metal raw material into the crucible 2. In this application example, the metal raw material is granular iron. Read the readings of the load cells 3. Calculate the sum of the readings of the four load cells 3 and record it as weight B. In this application example, weight B = 45 kg. S3. Metal powder is produced by an arc method. The metal raw material is melted into a liquid state. Subsequently, evaporation decreases and the liquid level drops. The readings of the weighing sensors 3 are continuously read. The sum of the readings of the four weighing sensors 3 is calculated and recorded as the real-time weight C. S4. Calculate the remaining height of the liquid in crucible 2 according to the formula: Remaining height of liquid level = total height - height of liquid level drop = ((CA) ÷ density of liquid metal) ÷ ​​area of ​​crucible bottom. When the remaining height of the liquid level approaches 3 cm, start adding metal raw material. In this application example, the liquid density of the metal raw material is 7.138 g / cm³, the radius of the crucible 2 is 12 cm, and when the real-time weight C is close to 3×π×12 2 ×7.138+25000=34683g≈34.6kg, start replenishing metal raw materials.

[0036] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A method for measuring the liquid level of a crucible, characterized in that: The following steps are involved: Q1. Set a cooling jacket outside the crucible and pass cooling water into it. After the water volume stabilizes, weigh the crucible and cooling jacket through a sensor to obtain the weight value a; Q2. Add the metal raw material into the crucible and obtain the weight value b; Q3: The equipment is working, the evaporation of the metal raw material decreases, and the real-time weight value c is obtained; Q4. According to the formula, the remaining height of the liquid level = ((ca) ÷ liquid metal density) ÷ crucible bottom area, calculate the remaining height of the liquid level in the crucible; Q5. Determine the feeding time based on the remaining height of the liquid level.

2. The method for measuring the liquid level of a crucible according to claim 1, wherein: In the Q1 step, the flow rate of cooling water is 10-20 L / min.

3. The method for measuring the liquid level of a crucible according to claim 1, wherein: In the step Q2, the total height of the liquid level in the crucible after the feeding = ((ba) ÷ density of liquid metal) ÷ ​​area of ​​the bottom of the crucible.

4. The method for measuring the liquid level of a crucible according to claim 1, wherein: There are multiple sensors, and the weight value a, weight value b and real-time weight value c are all the sum of the readings of multiple sensors.

5. A crucible liquid level measuring device, used in the crucible liquid level measuring method according to any one of claims 1 to 4, characterized in that: The invention comprises a vacuum container (1), wherein a crucible (2) and a weighing sensor (3) are provided in the vacuum container (1), the crucible (2) is placed above the weighing sensor (3), and a second cooling jacket (9) is provided on the crucible (2).

6. The crucible liquid level measuring device according to claim 5, characterized in that: The weighing sensor (3) is provided with a first cooling jacket (5), one side of the first cooling jacket (5) is provided with a first water inlet pipe (7), and the other side of the first cooling jacket (5) is provided with a first water outlet pipe (8).

7. The crucible liquid level measuring device according to claim 5, characterized in that: A second water inlet pipe (10) is provided on one side of the second cooling jacket (9), and a second water outlet pipe (11) is provided on the other side of the second cooling jacket (9).

8. The crucible liquid level measuring device according to claim 5, characterized in that: A plurality of guide plates (13) are provided in the second cooling jacket (9), and the guide plates (13) are arranged at intervals.

9. The crucible liquid level measuring device according to claim 8, characterized in that: The guide plate (13) is provided with a guide port (14), and the guide ports (14) on two adjacent guide plates (13) are located on different sides of the crucible (2).

10. The crucible liquid level measuring device according to claim 5, characterized in that: The surface roughness of the contact surface between the weighing sensor (3) and the first cooling jacket (5) is not greater than 0.025 μm, and the surface roughness of the contact surface between the first cooling jacket (5) and the weighing sensor (3) is not greater than 0.025 μm.

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