A method of sieving a superalloy powder and a system therefor

Abstract

The present application belongs to the technical field of high-temperature alloy spherical powder preparation, and relates to a screening method and system for high-temperature alloy powder. In the screening method, the inert gas atmosphere is replaced after vacuumizing the screening cabin before screening, so that the powder is kept dry during the screening process; according to the particle size distribution characteristics of the powder directly prepared by the ultra-high speed plasma rotating electrode atomization method, a specific structure of rectangular screen is designed in the screening cabin, and the first ultrasonic transducer and the first temperature monitoring module arranged on the outer wall of the screening cabin body are matched, so that the lower powder voltage is automatically adjusted according to the temperature data fed back by the first temperature monitoring module during the screening process, thereby effectively avoiding the bridging effect in the screening process and greatly improving the screening efficiency of the powder. In the screening system, the round-hole screen screening device is arranged on the lower powder pipeline of the target section powder tank, so that the irregular particles and non-metallic impurities in the target section powder are effectively removed, and the screening quality of the target metal powder is improved.

Description

Technical Field

[0001] This invention belongs to the field of high-temperature alloy spherical powder preparation technology, and relates to high-temperature alloy spherical powder prepared by ultra-high speed plasma rotating electrode atomization method, and particularly to a sieving method and system for high-temperature alloy powder. Background Technology

[0002] It is well known in the industry that the preparation of high-temperature alloy metal powder based on ultra-high speed plasma rotating electrode atomization involves melting the end face of an alloy rod using high-temperature plasma. The rod is then rotated at high speed by a motor, and the molten liquid film is atomized into spherical metal powder under centrifugal force and surface tension. Furthermore, the high-temperature alloy spherical metal powder prepared using this method exhibits excellent sphericity and extremely low hollow powder ratio. Simultaneously, because an inert gas is used as a protective atmosphere during the melting process, the oxygen and nitrogen increments of the metal powder are low. In addition, since the atomization chamber is made of metal, ceramic inclusions are not introduced during the melting process. Therefore, the 15~45μm / 15~53μm high-temperature alloy powder prepared using ultra-high speed plasma rotating electrode atomization has significant advantages in aerospace, gas turbine, and other military and defense fields.

[0003] Powders directly prepared using ultra-high speed plasma rotating electrode atomization (UHSE) require sieving with different sieves to separate them into target-grade powder (15-45 μm or 15-53 μm) and non-target-grade powder. The target-grade powder has a particle size concentrated between 38-45 μm or 38-53 μm, classifying it as a fine powder. When using a traditional ternary vibrating sieve, the following problems arise: 1. The fine powder results in an increased specific surface area, making it prone to absorbing moisture and clumping; 2. Traditional square sieve openings easily induce a "bridging effect," causing rapid clogging and requiring frequent shutdowns for cleaning. These problems significantly reduce sieving efficiency and production continuity, severely hindering the large-scale industrial production of metal powders.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a sieving method and system for high-temperature alloy powder, so as to solve the technical problems of powder moisture absorption and screen clogging in the sieving process of powder obtained by ultra-high speed plasma rotating electrode atomization method.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] On the one hand, the present invention provides a method for sieving high-temperature alloy powder, which uses a sieving device for sieving, and the specific steps are as follows:

[0008] Step 1: Start the vacuum pumping device to evacuate the screening chamber of the screening device to a vacuum degree ≤10Pa; then start the gas filling device to fill the screening chamber with inert gas until the gas pressure ≥0.02MPa and then stop filling.

[0009] Step 2: Turn on the vibrating motor of the screening device;

[0010] Step 3: Set the voltage value of the electromagnetic feeder and turn it on. The powder will be fed evenly under the influence of gravity and the vibration of the electromagnetic feeder.

[0011] Step 4: Start the screening machine to begin screening, and use the first temperature monitoring module to monitor the working temperature of the first ultrasonic transducer.

[0012] Step 5: During the screening process, the operating temperature of the first ultrasonic transducer is monitored by the first temperature monitoring module, and the monitored temperature data is fed back to the electromagnetic feeder. The electromagnetic feeder automatically adjusts the powder feeding voltage according to the temperature data. The air pressure in the screening chamber is monitored by the air inflation device. When the air pressure is lower than 0.015MPa, the air inflation device is activated to add inert gas until the air pressure in the screening chamber is ≥0.02MPa. Step 5 is repeated until the screening is completed.

[0013] Specifically, in step 5, the electromagnetic feeder automatically adjusts the powder feeding voltage based on temperature data, including:

[0014] The electromagnetic feeder automatically adjusts the powder feeding voltage based on temperature data. The temperature data and the powder feeding voltage are inversely proportional. Specifically, the two can be adjusted according to the embedded program of the equipment, and the corresponding curve formula is as follows:

[0015] ;

[0016] In the formula, the unit for temperature data is °C, and the unit for voltage values ​​is V;

[0017] For example: when the temperature is 40℃, the voltage value is:

[0018] .

[0019] Furthermore, the screening chamber is provided with a first rectangular screen and a second rectangular screen in sequence from top to bottom, both of which are made of austenitic stainless steel wire.

[0020] Furthermore, the first rectangular screen is a 106μm screen, and the short side of each rectangular screen hole ranges from 102 to 106μm, and the long side ranges from 110 to 114μm; the second rectangular screen is a 45μm screen or a 53μm screen: in the 45μm screen, the short side of each rectangular screen hole ranges from 43 to 47μm, and the long side ranges from 50 to 55μm; in the 53μm screen, the short side of each rectangular screen hole ranges from 51 to 55μm, and the long side ranges from 63 to 67μm.

[0021] On the other hand, the present invention provides a screening system that applies some or all of the screening methods described above, comprising: a screening device, the screening device including a screening chamber and a screening machine body located in the screening chamber, the gas filling device and the vacuuming device being disposed on the same side of the screening chamber, the gas filling device being used to provide inert gas into the screening chamber, and the vacuuming device being used to evacuate the screening chamber.

[0022] The top of the screening machine chamber is equipped with a powder feeding device, which is connected to the interior of the screening chamber via an electromagnetic feeder.

[0023] The screening chamber also includes a screening machine track at its bottom, through which the screening machine body is pushed into or pulled out of the screening chamber. The screening machine body obtains target segment powder and non-target segment powder by screening the powder.

[0024] The first ultrasonic transducer is installed on the outer wall of the screening machine chamber, and the first ultrasonic transducer includes a first temperature monitoring module.

[0025] Specifically, the powder feeding device includes: a powder tank for holding powder, the powder tank being placed on a platform scale, the platform scale being used to monitor the amount of powder discharged from the powder tank in real time and output the powder discharge rate, and the powder tank being connected to the interior of the screening machine chamber via an electromagnetic feeder.

[0026] Furthermore, the screening machine chamber is connected to a non-target section powder tank and a target section powder tank via pipes; a round hole screen screening device is also installed on the powder discharge pipe connecting the target section powder tank and the screening machine chamber.

[0027] Furthermore, a second ultrasonic transducer is provided on the outer wall of the circular hole sieve screening device, and the second ultrasonic transducer includes a second temperature monitoring module.

[0028] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0029] 1) The sieving method provided by the present invention involves evacuating the sieving chamber and replacing it with an inert gas atmosphere before sieving, thereby keeping the powder dry during the sieving process.

[0030] 2) Based on the particle size distribution characteristics of powder directly prepared by ultra-high speed plasma rotating electrode atomization, this sieving method designs a rectangular screen with a specific structure in the sieving chamber. Combined with the first ultrasonic transducer and its first temperature monitoring module set on the outer wall of the sieving chamber, the powder feeding voltage is automatically adjusted according to the temperature data fed back by the first temperature monitoring module during the sieving process, thereby effectively avoiding the bridging effect during the sieving process and greatly improving the sieving efficiency of the powder.

[0031] 3) The screening system using the above screening method effectively removes irregularly shaped particles and non-metallic impurities from the powder in the target section by setting a round hole screen screening device on the powder discharge pipe of the powder tank in the target section, which is beneficial to improving the screening quality of the target metal powder. In addition, by setting a second ultrasonic transducer on the outer wall of the round hole screen screening device, the round hole screen is subjected to slight elastic deformation by high frequency ultrasonic vibration, which destroys the electrostatic force / adsorption force of the powder at the screen hole and prevents fine powder from forming "bridging" blockage in the screen hole, which is beneficial to solving screen blockage and improving fine powder screening efficiency. Attached Figure Description

[0032] The accompanying drawings are incorporated in and form part of this specification, and together with the description serve to explain the principles of the invention.

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A flowchart of the screening method provided by the present invention;

[0035] Figure 2 A structural diagram of the high-temperature alloy powder sieving system provided by the present invention;

[0036] Figure 3 An optical microscope image of the 53μm rectangular sieve provided in Embodiment 2 of the present invention;

[0037] Figure 4 This is an optical microscope image of the rectangular sieve after sieving according to Embodiment 2 of the present invention.

[0038] Figure 5 This is a photograph of the high-temperature alloy powder obtained after sieving, as provided in Example 2 of the present invention.

[0039] Figure 6 An optical microscope image of the product after sieving using a square sieve, provided for comparison.

[0040] Figure 7 Photograph of the actual powder obtained after sieving of the high-temperature alloy powder provided for comparison.

[0041] The components include: 1. Powder hopper; 2. Platform scale; 3. Electromagnetic feeder; 4. Air filling device; 5. Vacuum device; 6. Screening machine chamber; 7. Screening compartment; 71. First rectangular screen; 72. Second rectangular screen; 8. Hole screen screening device; 81. Hole screen; 9. Vibrating motor; 10. Screening machine track; 11. Non-target section powder hopper; 12. Target section powder hopper; 13. First ultrasonic transducer; 14. Second ultrasonic transducer. Detailed Implementation

[0042] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples consistent with some aspects of the invention as detailed in the appended claims.

[0043] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Example 1

[0044] See Figure 1 This embodiment provides a method for sieving high-temperature alloy powder, using a sieving device (three-dimensional vibrating screen) for sieving. The specific steps are as follows:

[0045] Step 1: Start the vacuum pumping device 5 to evacuate the screening chamber 7 of the screening device to a vacuum degree ≤10Pa; then start the gas filling device 4 to fill the screening chamber 7 with inert gas until the gas pressure ≥0.02MPa and then stop filling.

[0046] Step 2: Turn on the vibrating motor 9 of the screening device;

[0047] Step 3: Set the voltage value of the electromagnetic feeder 3 and turn it on. The powder will be fed evenly under the influence of gravity and the vibration of the electromagnetic feeder 3.

[0048] Step 4: Start the screening machine to begin screening, and use the first temperature monitoring module to monitor the working temperature of the first ultrasonic transducer 13.

[0049] Step 5: During the screening process, the operating temperature of the first ultrasonic transducer 13 is monitored by the first temperature monitoring module and the monitored temperature data is fed back to the electromagnetic feeder 3. The electromagnetic feeder 3 automatically adjusts the powder feeding voltage according to the temperature data. The air pressure in the screening chamber 7 is monitored by the air filling device 4. When the air pressure is lower than 0.015MPa, the air filling device 4 is started to add inert gas until the air pressure in the screening chamber 7 is ≥0.02MPa. Step 5 is repeated until the screening is completed.

[0050] In this embodiment, the screening system applying the above screening method is described in [reference needed]. Figure 2 The device includes a screening device, which includes a screening chamber 7 and a screening machine body 6 located in the screening chamber 7. The gas filling device 4 and the vacuuming device 5 are both located on the same side of the screening chamber 7. The gas filling device 4 is used to provide inert gas into the screening chamber 7, and the vacuuming device 5 is used to evacuate the screening chamber 7.

[0051] The top of the screening chamber 6 is equipped with a powder feeding device, which is connected to the interior of the screening chamber 7 via an electromagnetic feeder 3.

[0052] The screening chamber 7 also includes a screening machine track 10 located at its bottom. The screening machine body 6 is pushed into or pulled out of the screening chamber 7 through the screening machine track 10. The screening machine body 6 obtains target segment powder and non-target segment powder by screening the powder.

[0053] The first ultrasonic transducer 13 is disposed on the outer wall of the screening machine chamber 6, and the first ultrasonic transducer 13 includes a first temperature monitoring module.

[0054] The powder feeding device includes: a powder tank 1 for holding powder, the powder tank 1 is placed on a platform scale 2, the platform scale 2 is used to monitor the amount of powder discharged from the powder tank 1 in real time and output the powder discharge rate, and the powder tank 1 is connected to the interior of the screening machine chamber 6 through an electromagnetic feeder 3.

[0055] Furthermore, the screening machine chamber 6 is connected to a non-target section powder tank 11 and a target section powder tank 12 via pipes. Preferably, a perforated sieve 8 is also provided on the powder discharge pipe connecting the target section powder tank 12 and the screening machine chamber 6, wherein a second ultrasonic transducer 14 is provided on the outer wall of the perforated sieve 8, and the second ultrasonic transducer 14 includes a second temperature monitoring module.

[0056] Furthermore, the screening machine chamber 6 is provided with a first rectangular screen 71 and a second rectangular screen 72 arranged sequentially from top to bottom, both of which are made of austenitic stainless steel wire.

[0057] The specific installation process of the screening system provided in this embodiment is as follows:

[0058] 1) First, 1200 kg of GH4099 powder (prepared by ultra-high speed plasma rotating electrode atomization method) is loaded into powder container 1. Then, powder container 1 is placed on platform scale 2. Platform scale 2 is used to monitor the amount of powder fed into powder container 1 in real time and output the powder feeding rate.

[0059] 2) Pull the screening machine cabin 6 out of the screening chamber 7 via the screening machine track 10;

[0060] 3) Replace the first rectangular screen 71 (upper screen) and the second rectangular screen 72 (lower screen) inside the screening machine chamber 6, and replace the round hole screen 81 in the powder discharge pipe of the target section powder tank;

[0061] The first rectangular sieve 71 is a 106μm sieve, with the short side of each rectangular sieve hole ranging from 102 to 106μm and the long side ranging from 110 to 114μm; the second rectangular sieve 72 is a 45μm sieve, with the short side of each rectangular sieve hole ranging from 43 to 47μm and the long side ranging from 50 to 55μm; the diameter of the round hole in the circular hole sieve 81 is 63μm.

[0062] 4) Install a first ultrasonic transducer 13 on the outer wall of the screening machine chamber 6, turn on the corresponding first temperature monitoring module, and the monitoring temperature range monitored by the first temperature monitoring module is 23~60℃.

[0063] 5) Install a second ultrasonic transducer 14 on the outer wall of the round hole screen screening device 8 in the screening machine chamber 6, and turn on the corresponding second temperature monitoring module.

[0064] 6) After installation, push the screening machine chamber 6 into the screening chamber 7 through the screening machine track 10, close the door, and connect the powder tank 1 with the screening machine chamber 6 through the electromagnetic feeder 3.

[0065] After the above screening system is installed, it should be used for screening high-temperature alloy powders:

[0066] Screening begins at room temperature. The powder is fed evenly under gravity and vibration of the electromagnetic feeder 3, and then screening begins normally. At this time, the temperature data monitored by the first temperature monitoring module is 26℃ and the voltage value is 155.94V.

[0067] When the screening reaches 660kg, the temperature data monitored by the first temperature monitoring module is 36℃, and the voltage value of the electromagnetic feeder 3 automatically drops to 122.20V until the temperature data monitored by the first temperature monitoring module is 39℃. At this time, the air pressure is displayed as 0.017MPa.

[0068] When the screening reaches 900 kg, the temperature data monitored by the first temperature monitoring module is 42℃. The voltage range of the electromagnetic feeder 3 automatically drops to 117.69V, the air pressure in the screening chamber 7 drops to 0.015MPa, and the air filling device 4 automatically starts to add inert gas until the air pressure reaches 0.021MPa. Until the screening ends, the air pressure is displayed as 0.016MPa. Example 2

[0069] Based on the screening system structure provided in Example 1, the specific installation process of the screening system in this example is as follows:

[0070] 1) First, 1150 kg of GH4169 powder (prepared by ultra-high speed plasma rotating electrode atomization method) is loaded into powder container 1. Then, powder container 1 is placed on platform scale 2. Platform scale 2 is used to monitor the amount of powder fed into powder container 1 in real time and output the powder feeding rate.

[0071] 2) Pull the screening machine cabin 6 out of the screening chamber 7 via the screening machine track 10;

[0072] 3) Replace the first rectangular screen 71 (upper screen) and the second rectangular screen 72 (lower screen) inside the screening machine chamber 6. The rectangular screens are all made of austenitic stainless steel. Replace the round hole screen 81 in the powder discharge pipe of the powder tank 12 in the target section.

[0073] The first rectangular sieve 71 is a 106μm sieve, with the short side of each rectangular sieve opening ranging from 102 to 106μm and the long side ranging from 110 to 114μm; the second rectangular sieve 72 is a 53μm sieve (see...). Figure 3 Each rectangular sieve hole has a short side range of 51~55μm and a long side range of 63~67μm; the diameter of the round hole in the round hole sieve 81 is 63μm.

[0074] 4) Install a first ultrasonic transducer 13 on the outer wall of the screening machine chamber 6, turn on the corresponding first temperature monitoring module, and the monitoring temperature range monitored by the first temperature monitoring module is 23~60℃.

[0075] 5) Install a second ultrasonic transducer 14 on the outer wall of the round hole screen screening device 8 in the screening machine chamber 6, and turn on the corresponding second temperature monitoring module.

[0076] 6) After installation, push the screening machine chamber 6 into the screening chamber 7 through the screening machine track 10, close the door, and connect the powder tank 1 with the screening machine chamber 6 through the electromagnetic feeder 3.

[0077] After the above screening system is installed, it should be used for screening high-temperature alloy powders:

[0078] Screening begins at room temperature. The voltage of electromagnetic feeder 3 is set to H130-H150. The powder is fed evenly under gravity and vibration of electromagnetic feeder 3. Screening then begins normally. At this time, the temperature data monitored by the first temperature monitoring module is 30℃ and the voltage value is 147.77V.

[0079] When the screening reaches 450kg, the temperature data monitored by the first temperature monitoring module is 38℃, the voltage value of electromagnetic feeder 3 automatically drops to 117.14V, and the air pressure display is 0.016MPa.

[0080] When the screening reaches 900 kg, the temperature data monitored by the first temperature monitoring module is 41℃. The voltage range of the electromagnetic feeder 3 automatically drops to 110.29V. At this time, the air pressure value is displayed as 0.009MPa. The air filling device 4 automatically turns on to replenish inert gas until the air pressure reaches 0.021MPa. Until the screening ends, the air pressure value is displayed as 0.019MPa. Comparative Example

[0081] This comparative example provides a method for sieving GH4169 powder using a traditional ternary vibrating screen equipped with a square screen. The powder has a particle size of 15~53μm and a weight of 1150kg. The specific sieving process is as follows:

[0082] Step 1: Turn on the electromagnetic feeder. The powder begins to be sieved under the action of gravity and the vibration of the electromagnetic feeder.

[0083] Step 2: When the screen reaches 300kg, the screen becomes severely clogged and screening cannot continue. Open the screening machine to clean the screen and then resume screening.

[0084] Step 3: When the screening reaches 700kg, the screen becomes severely clogged and screening cannot continue. Open the screening machine to clean the screen and then resume screening.

[0085] Step 4: End screening.

[0086] Analysis of the above embodiments and comparative examples reveals that, in the comparative example, the optical microscope image after sieving using the square sieve is shown below. Figure 6 For the optical microscope image of the rectangular sieve after sieving in Example 2, please refer to [reference needed]. Figure 4 Analysis shows that the clogging rate of the rectangular screen in Example 2 was 20.83%, while the clogging rate of the square screen in the comparative example was 48.95%. The comparison shows that the clogging rate of the rectangular screen designed in this invention was reduced by 57.44%. Furthermore, a photograph of the powder obtained after sieving the high-temperature alloy powder provided in the comparative example can be found here. Figure 7 See the photograph of the actual powder obtained after sieving the high-temperature alloy powder provided in Example 2 of this invention. Figure 5The comparison showed that the powder obtained in Example 2 was dry and without grooves, while the powder obtained after sieving in the comparative example was moist and had grooved streaks. Furthermore, the inventors calculated that the total sieving time used in the comparative example was 16 hours and 40 minutes, while the total sieving time used in Example 2 was 10 hours and 15 minutes, representing a 38.5% improvement in sieving efficiency.

[0087] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention.

[0088] It should be understood that the present invention is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A method for sieving high-temperature alloy powder, comprising using a sieving device for sieving, characterized in that, The specific steps are as follows: Step 1: Start the vacuum pumping device (5) to evacuate the screening chamber (7) of the screening device to a vacuum degree ≤10Pa; then start the gas filling device (4) to fill the screening chamber (7) with inert gas until the gas pressure ≥0.02MPa and then stop filling. Step 2: Turn on the vibrating motor (9) of the screening device; Step 3: Set the voltage value of the electromagnetic feeder (3) and turn it on. The powder will be fed evenly under the influence of gravity and the vibration of the electromagnetic feeder (3). Step 4: Start the screening machine to begin screening, and use the first temperature monitoring module to monitor the working temperature of the first ultrasonic transducer (13); Step 5: During the screening process, the working temperature of the first ultrasonic transducer (13) is monitored by the first temperature monitoring module and the monitored temperature data is fed back to the electromagnetic feeder (3). The electromagnetic feeder (3) automatically adjusts the powder feeding voltage according to the temperature data. The air pressure in the screening chamber (7) is monitored by the air filling device (4). When the air pressure is lower than 0.015MPa, the air filling device (4) is started to add inert gas until the air pressure in the screening chamber (7) is ≥0.02MPa. Step 5 is repeated until the screening is completed. The screening chamber (7) is provided with a first rectangular screen (71) and a second rectangular screen (72) arranged from top to bottom, and both are made of austenitic stainless steel wire. The first rectangular screen (71) is a 106μm screen, and the short side of each rectangular screen hole ranges from 102 to 106μm, and the long side ranges from 110 to 114μm; The second rectangular screen (72) is a 45μm screen or a 53μm screen: in the 45μm screen, the short side of each rectangular screen hole ranges from 43 to 47μm and the long side ranges from 50 to 55μm; in the 53μm screen, the short side of each rectangular screen hole ranges from 51 to 55μm and the long side ranges from 63 to 67μm.

2. The sieving method for high-temperature alloy powder according to claim 1, characterized in that, In step 5, the electromagnetic feeder (3) automatically adjusts the powder feeding voltage according to the temperature data. The temperature data and the powder feeding voltage are inversely proportional, and the corresponding curve formula is as follows (1): Equation (1) In equation (1), the temperature data is in °C and the voltage value is in V.

3. A screening system employing the screening method as described in any one of claims 1 to 2, characterized in that, include: The screening device includes a screening chamber (7) and a screening machine body (6) located in the screening chamber (7); the gas filling device (4) and the vacuuming device (5) are both located on the same side of the screening chamber (7). The gas filling device (4) is used to provide inert gas into the screening chamber (7), and the vacuuming device (5) is used to evacuate the screening chamber (7). The top of the screening machine chamber (6) is provided with a powder feeding device, which is connected to the interior of the screening chamber (7) through an electromagnetic feeder (3); The screening chamber (7) also includes a screening machine track (10) at its bottom, through which the screening machine body (6) is pushed into or pulled out of the screening chamber (7), and the screening machine body (6) obtains target segment powder and non-target segment powder by screening the powder. The first ultrasonic transducer (13) is installed on the outer wall of the screening machine chamber (6), and the first ultrasonic transducer (13) includes a first temperature monitoring module.

4. The screening system according to claim 3, characterized in that, The powder feeding device includes: a powder tank (1) for holding powder, the powder tank (1) is placed on a platform scale (2), the platform scale (2) is used to monitor the amount of powder fed from the powder tank (1) in real time and output the powder feeding rate, and the powder tank (1) is connected to the interior of the screening machine chamber (6) through an electromagnetic feeder (3).

5. The screening system according to claim 3, characterized in that, The screening machine chamber (6) is connected to a non-target section powder tank (11) and a target section powder tank (12) via pipes.

6. The screening system according to claim 5, characterized in that, The powder discharge pipe connecting the target section powder tank (12) to the screening machine chamber (6) is also equipped with a round hole screen screening device (8).

7. The screening system according to claim 6, characterized in that, The outer wall of the circular hole sieve screening device (8) is provided with a second ultrasonic transducer (14), and the second ultrasonic transducer (14) includes a second temperature monitoring module.

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