A vacuum sampling device and method for rapidly quenched NdFeB magnetic powder

Abstract

This invention discloses a vacuum sampling device and method for neodymium iron boron (NdFeB) rapid quenching magnetic powder, comprising a base plate, a column, a guide rail, a lifting platform, a sampling tube, a gas pipeline, and a sample receiving chamber. The column and guide rail are welded and fixed above the base plate, and the lifting platform is slidably fixed on the guide rail via a sleeve. One end of the gas pipeline is connected to the sampling tube via a quick connector, and the other end is connected to the sample receiving chamber. Argon gas is introduced into the gas pipeline. Advantages: This invention employs a one-time, multi-point vacuum negative pressure mechanical sampling method, and the vacuuming, lifting, and gas filling processes are all automated. The sampling process is carried out under inert gas protection, preventing sample oxidation and deterioration. It also achieves layered sampling, solving problems such as damage to packaging and uneven sample uniformity caused by manual sampling of powdered materials. This invention plays a positive role in improving the level of mechanical equipment and stabilizing product performance in the NdFeB magnetic powder industry.

Description

Technical Field

[0001] This invention relates to the field of rare earth metallurgy, specifically to a vacuum sampling device and method for neodymium iron boron rapid quenching magnetic powder. Background Technology

[0002] Neodymium iron boron (NdFeB) is a type of magnet known as the "King of Magnets" due to its excellent magnetic properties. Containing a large amount of the rare earth element neodymium, as well as iron and boron, NdFeB is characterized by its hardness and brittleness. As a rare earth permanent magnet material, NdFeB possesses extremely high magnetic energy product and coercivity. Its high energy density has enabled its widespread application in modern industry and electronics, making the miniaturization, weight reduction, and thinning of instruments, electroacoustic motors, magnetic separation and magnetization equipment possible.

[0003] Currently, the collection and sampling of neodymium iron boron magnetic powder mostly uses cement samplers, which require multiple samplings at multiple points. After sampling, the sample is placed in a plastic bag and filled with argon gas. This operation has three drawbacks: 1. The sampling device is made of metal, which generates static electricity when rubbing against the magnetic powder, potentially causing a fire; 2. The sampling location and sampling point are random, resulting in unrepresentative and non-reproducible samples; 3. There is no inert gas protection during the sampling process, leading to high oxidation levels of the magnetic powder due to contact with air. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a vacuum sampling device and method for neodymium iron boron rapid quenching magnetic powder, which can realize the automated vacuum, lifting, gas filling and sampling process, so as to protect the sample and improve the safety and representativeness of the sampling.

[0005] The first objective of this invention is to provide a vacuum sampling device for rapidly quenched NdFeB magnetic powder.

[0006] The second objective of this invention is to provide a method for sampling using a vacuum sampling device for rapidly quenched neodymium iron boron magnetic powder.

[0007] The first objective of this invention is achieved by the following technical solution: a vacuum sampling device for neodymium iron boron rapid quenching magnetic powder, comprising a base plate, columns, guide rails, a lifting platform, a sampling tube, a gas pipeline, and a sample receiving chamber; at least two columns are vertically arranged on the top surface of the base plate, and a crossbeam is provided between the top ends of the columns; two or more guide rails are vertically arranged between the top surface of the base plate and the crossbeam between the columns; the lifting platform is slidably arranged on the guide rails; a lifting mechanism is provided between the top surface of the base plate and the bottom surface of the lifting platform; one or more vertically arranged sampling tubes are separately and movably arranged on the lifting platform; the top end of the sampling tube is positioned above the top surface of the lifting platform, and a quick connector is provided at the top end of the sampling tube; the sampling tube is connected to the gas pipeline through the quick connector, and the outlet of the gas pipeline is connected to the inlet of the sample receiving chamber; the bottom end of the sampling tube is positioned below the bottom surface of the lifting platform, and a sampling nozzle is movably arranged at the bottom end of the sampling tube.

[0008] Preferably, the lifting platform is placed between the guide rails, and a sleeve is slidably sleeved on the guide rails, with the outer wall of the sleeve fixedly connected to the side wall of the lifting platform.

[0009] Preferably, the lifting mechanism is any one of a hydraulic cylinder, an electric telescopic rod, or a pneumatic cylinder.

[0010] Preferably, an argon gas inlet valve and a sampling valve are sequentially installed on the gas pipeline from the sampling tube to the sample receiving chamber.

[0011] Preferably, a vacuum generator, an argon gas filling valve, a pressure gauge, and an observation hole are provided at the top of the sample receiving chamber, a discharge funnel is provided at the bottom of the sample receiving chamber, a manual valve is provided at the nozzle of the discharge funnel, and a vibrator is installed on the inclined outer wall of the discharge funnel.

[0012] Preferably, it further includes tracks, a moving trolley, a push rod, and a material bucket; two horizontally arranged tracks are provided parallel to each other on the top surface of the base plate between the columns, and the moving trolley that moves back and forth is provided on the tracks; the material bucket is separately placed on the moving trolley; the push rod is hinged to the base plate below the end of the track away from the lifting platform, and the telescopic end of the push rod is movably hinged to the bottom of the moving trolley.

[0013] Preferably, it further includes a PLC controller, a rising sensor, a falling sensor, a trolley sensor, and a stop sensor; the rising sensor and the falling sensor are arranged sequentially from top to bottom on any of the guide rails; the trolley sensor is arranged at one end of the rail located below the lifting platform, and the stop sensor is arranged at the other end of the rail away from the lifting platform; the rising sensor, the falling sensor, the trolley sensor, and the stop sensor are all electrically connected to the PLC controller and send electrical signals to the PLC controller; the argon gas inlet valve, the sampling valve, the vacuum generator, the argon gas filling valve, the lifting mechanism, and the push rod are all electrically connected to the PLC controller and are controlled by the PLC controller to start and stop.

[0014] The second objective of this invention is achieved by the following technical solution: sampling is performed using this neodymium iron boron rapid quenching magnetic powder vacuum sampling device, which includes the following steps:

[0015] Step 1, Sampling preparation: All valves are closed, the moving trolley is in contact with the termination sensor, the moving trolley is at the starting position away from the lifting platform, the lifting platform is in contact with the descent sensor, and the lifting platform is at the lower limit position; place the bucket containing the material to be sampled on the moving trolley.

[0016] Step 2: The PLC controller controls the lifting mechanism to drive the lifting platform to rise. At the same time as the lifting platform rises, the PLC controller controls the argon gas inlet valve to open, and argon gas with a pressure of 2-4MPa is introduced into the gas pipeline and sampling tube and sprayed out from the sampling gun head.

[0017] Step 3: The rising lifting platform touches the lifting sensor, which transmits the signal that the lifting platform has reached the upper limit to the PLC controller. The PLC controller controls the lifting mechanism to stop, and the lifting platform stops rising. The bottom of the sampling gun head under the lifting platform is placed above the opening of the material bucket.

[0018] Step 4: After the lifting platform stops rising, the PLC controller controls the push rod to extend, and the push rod pushes the moving trolley to move downwards from the lifting platform.

[0019] Step 5: The moving trolley touches the trolley sensor, and the trolley sensor transmits the signal of the moving trolley's arrival to the PLC controller. The PLC controller controls the push rod to stop extending, and the moving trolley stops moving, so that the material bucket is placed below the lifting platform.

[0020] Step 6: After the moving trolley stops moving, the PLC controller controls the lifting mechanism to drive the lifting platform to descend. During the descent of the lifting platform, the sampling gun head below the lifting platform is inserted into the material to be sampled in the material bucket below.

[0021] Step 7: The descending lifting platform touches the descent sensor. The descent sensor transmits the signal that the lifting platform has reached the lower limit to the PLC controller. The PLC controller controls the lifting mechanism to stop, and the lifting platform stops descending. At the same time as the lifting platform stops descending, the PLC controller controls the argon gas inlet valve to close.

[0022] Step 8: After the PLC controller closes the argon gas inlet valve, the vacuum generator is turned on; after the vacuum generator is turned on, the pressure gauge transmits the pressure signal in the sample receiving chamber to the PLC controller.

[0023] Step 9: When the pressure in the sample chamber is negative 4-6MPa, the PLC controller controls the sampling valve to open. At the same time, the PLC controller controls the lifting mechanism to drive the lifting platform to rise. During the rising process of the lifting platform, the sampling nozzles that rise with the lifting platform achieve layered sampling.

[0024] Step 10: The rising lifting platform touches the lifting sensor, which transmits a signal that the lifting platform has reached the upper limit to the PLC controller. The PLC controller then controls the lifting mechanism to stop, and the lifting platform stops rising.

[0025] Step 11: After the lifting platform stops rising, the PLC controller controls the sampling valve and vacuum generator to shut down.

[0026] Step 12: After the sampling valve and vacuum generator are closed, the PLC controller controls the argon gas filling valve on the sample receiving chamber to open, and argon gas is introduced into the sample receiving chamber which is under negative pressure.

[0027] Step 13: When the pressure inside the sample chamber is at atmospheric pressure, the PLC controller controls the argon gas filling valve to close.

[0028] Step 14: After the argon gas filling valve is closed, the PLC controller controls the push rod to retract, and the push rod drives the moving trolley to move towards the starting position.

[0029] Step 15: When the moving trolley touches the stop sensor at the starting position, the stop sensor transmits a reset signal to the PLC controller, and the PLC controller controls the moving trolley to stop moving.

[0030] Step 16: After the moving trolley stops moving, the PLC controller controls the lifting mechanism to drive the lifting platform to descend. When the lifting platform descends and touches the descent sensor, the descent sensor transmits the signal that the lifting platform has reached the lower limit to the PLC controller. The PLC controller then controls the lifting mechanism to stop, and the lifting platform stops descending.

[0031] Step 17: After the lifting platform stops descending, the PLC controller controls all valves to close and removes the material bucket from the mobile trolley, thus ending this sampling.

[0032] Preferably, after the current sampling in step 17 is completed, a packaging bag is placed over the nozzle of the discharge funnel, the manual valve is opened, the sample is discharged and packaged, and after packaging is completed, the manual valve is closed to prepare for the next sampling.

[0033] Advantages of this invention:

[0034] 1. This invention adopts a one-time multi-point vacuum negative pressure mechanical sampling method. The vacuum, lifting, and inflation processes are all automated. It simulates the falling and stacking process of the sample during packaging and arranges the sampling points accordingly. This results in multiple sampling points, and samples can be taken from different positions in the vertical direction. This achieves layered sampling, making the sampling results more representative. It solves the problems of damage to packaging and uneven sample uniformity caused by manual sampling of powdered materials.

[0035] 2. The device of the present invention is in an argon atmosphere throughout the entire process, and the sampling process is carried out under the protection of inert gas, which avoids the sample from coming into contact with air and prevents the sample from oxidizing and deteriorating.

[0036] 3. It has played a positive role in promoting the advancement of mechanical equipment in the NdFeB magnetic powder industry and stabilizing product performance. Attached Figure Description

[0037] 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, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0039] Figure 2 yes Figure 1 Side view.

[0040] Figure 3 This is a control system diagram of the present invention.

[0041] 1. Base plate, 2. Column, 3. Guide rail, 4. Lifting platform, 401. Sleeve, 402. Upward sensor, 403. Downward sensor, 5. Quick connector, 6. Sampling tube, 601. Sampling nozzle, 7. Gas pipeline, 701. Argon inlet valve, 702. Sampling valve, 8. Sample receiving chamber, 801. Discharge funnel, 802. Manual valve, 803. Vacuum generator, 804. Observation hole, 805. Pressure gauge, 806. Argon filling valve, 9. Vibrator, 10. Moving trolley, 1001. Trolley sensor, 1002. Termination sensor, 11. Material bucket, 12. Rail, 13. Push rod, 14. Hydraulic cylinder, 15. PLC controller, 16. Crossbeam. Detailed Implementation

[0042] like Figure 1 and Figure 2 As shown, a vacuum sampling device for neodymium iron boron rapid quenching magnetic powder includes a base plate 1, columns 2, guide rails 3, lifting platform 4, sampling tube 6, gas pipeline 7, and sample receiving chamber 8. In this embodiment, the device is provided with four columns 2 and four guide rails 3, and in this embodiment, the sampling gun head 601, sampling tube 6, quick connector 5, and gas pipeline 7 are all made of PPS material. Four vertical columns 2 are installed on both sides of the top surface of the base plate 1, and a crossbeam 16 is installed between the tops of the four columns 2. Two guide rails 3 are installed vertically between the top surface of the base plate 1 and the crossbeam 16 between two columns 2 on the same side. The columns 2 and guide rails 3 are of the same length, and the length of the guide rails 3 is greater than 2.5 times the length of the sampling tube 6. In this embodiment, the length of the guide rails 3 is 3 times the length of the sampling tube 6. The lifting platform 4 is horizontally located between the four guide rails 3. A sleeve 401 is slidably fitted on the guide rails 3. The outer wall of the sleeve 401 is fixedly connected to the side wall of the lifting platform 4, allowing the lifting platform 4 to slide up and down on the guide rails 3. A hydraulic cylinder 14 is installed between the top surface of the base plate 1 and the bottom surface of the lifting platform 4. The fixed end of the hydraulic cylinder 14 is fixed to the base plate 1, and the telescopic end of the hydraulic cylinder 14 is fixed to the bottom surface of the lifting platform 4. Five vertically arranged sampling tubes 6 are separately mounted on the lifting platform 4. The top of the sampling tube 6 is positioned above the top surface of the lifting platform 4, and a quick connector 5 is provided at the top opening of the sampling tube 6, which allows for easy disassembly and cleaning of the sampling tube 6. The other end of the quick connector 5 is connected to the gas pipeline 7. The bottom end of the sampling tube 6 is positioned below the bottom surface of the lifting platform 4, and a sampling nozzle 601 is movably mounted at the bottom opening of the sampling tube 6. An argon gas inlet valve 701 and a sampling valve 702 are sequentially installed on the gas pipeline 7 from the sampling tube 6 to the sample receiving chamber 8. Argon gas is introduced into the gas pipeline 7, so that the entire sampling environment is protected by argon gas. The sampling valve 702 is used to control the sampling.

[0043] Two horizontal tracks 12 are provided on the top surface of the base plate 1 between the two columns 2. A reciprocating trolley 10 is provided on the tracks 12. The top surface of the trolley 10 has a circular groove with a diameter slightly larger than that of the material bucket 11, which facilitates the stable placement of the material bucket 11 containing the material to be sampled on the trolley 10. One end of the track 12 is located below the lifting platform 4, and a trolley sensor 1001 is provided at one end of the track 12 below the lifting platform 4 to receive the signal that the trolley 10 has reached the sampling position. The end of the track 12 away from the lifting platform 4 is the starting position of the trolley 10, and a stop sensor 1002 is provided here to receive the signal that the trolley 10 has reached the starting position. A push rod 13 is hinged to the base plate 1 below the end of the track 12 away from the lifting platform 4. The telescopic end of the push rod 13 is hinged to the bottom of the trolley 10 to realize the push-pull displacement of the trolley 10.

[0044] The outlet of gas pipeline 7 is connected to the inlet of sample receiving chamber 8. A vacuum generator 803, an argon gas filling valve 806, a pressure gauge 805, and an observation hole 804 are installed at the top of sample receiving chamber 8. The argon gas filling valve 806 supplies argon gas to sample receiving chamber 8, the vacuum generator 803 creates a negative pressure inside sample receiving chamber 8, and the pressure gauge 805 and observation hole 804 are used to observe the pressure inside sample receiving chamber 8. A discharge funnel 801 is located at the bottom of sample receiving chamber 8, with a manual valve 802 at the nozzle. A vibrator 9 is installed on the inclined outer wall of discharge funnel 801; when the sample feeding speed is slow, the vibrator 9 can be activated to assist feeding. After sampling, the manual valve 802 is opened to package the sample in sample receiving chamber 8.

[0045] like Figure 3 As shown, the rising sensor 402, the falling sensor 403, the trolley sensor 1001, and the termination sensor 1002 are all electrically connected to the PLC controller 15 and send electrical signals to the PLC controller 15; the argon gas inlet valve 701, the sampling valve 702, the vacuum generator 803, the argon gas filling valve 806, the hydraulic cylinder 14, and the push rod 13 are all electrically connected to the PLC controller 15 and are controlled by the PLC controller 15 to start and stop.

[0046] Workflow:

[0047] Step 1, Sampling preparation: All valves are closed. The moving trolley 10 is in contact with the termination sensor 1002. The moving trolley 10 is located at the starting position away from the lifting platform 4. The lifting platform 4 is in contact with the descent sensor 403. The lifting platform 4 is located at the lower limit position. Place the material bucket 11 containing the material to be sampled on the moving trolley 10.

[0048] Step 2: PLC controller 15 controls hydraulic cylinder 14 to drive lifting platform 4 to rise. At the same time as lifting platform 4 rises, PLC controller 15 controls argon gas inlet valve 701 to open, and argon gas with a pressure of 2-4MPa is introduced into gas pipeline 7 and sampling tube 6 and sprayed out from sampling nozzle 601.

[0049] Step 3: The rising lifting platform 4 touches the lifting sensor 402. The lifting sensor 402 transmits the signal that the lifting platform 4 has reached the upper limit to the PLC controller 15. The PLC controller 15 controls the hydraulic cylinder 14 to stop, and the lifting platform 4 stops rising. The bottom of the sampling gun head 601 under the lifting platform 4 is placed above the opening of the material bucket 11.

[0050] Step 4: After the lifting platform 4 stops rising, the PLC controller 15 controls the push rod 13 to extend, and the push rod 13 pushes the moving trolley 10 to move downwards from the lifting platform 4.

[0051] Step 5: The moving trolley 10 touches the trolley sensor 1001. The trolley sensor 1001 transmits the signal of the moving trolley 10 to the PLC controller 15. The PLC controller 15 controls the push rod 13 to stop extending, and the moving trolley 10 stops moving, so that the material bucket 11 is placed below the lifting platform 4.

[0052] Step 6: After the moving trolley 10 stops moving, the PLC controller 15 controls the hydraulic cylinder 14 to drive the lifting platform 4 to descend. During the descent of the lifting platform 4, the sampling gun head 601 below the lifting platform 4 is inserted into the material to be sampled in the lower material bucket 11.

[0053] Step 7: The descending lifting platform 4 touches the descent sensor 403. The descent sensor 403 transmits the signal that the lifting platform 4 has reached the lower limit to the PLC controller 15. The PLC controller 15 controls the hydraulic cylinder 14 to stop, and the lifting platform 4 stops descending. At the same time as the lifting platform 4 stops descending, the PLC controller 15 controls the argon gas inlet valve 701 to close.

[0054] Step 8: After the PLC controller 15 closes the argon gas inlet valve 701, the vacuum generator 803 is turned on; after the vacuum generator 803 is turned on, the pressure gauge 805 transmits the pressure signal in the sample receiving chamber 8 to the PLC controller 15.

[0055] Step 9: When the pressure inside the sample collection chamber 8 is negative 4-6MPa, the PLC controller 15 controls the sampling valve 702 to open. At the same time, the PLC controller 15 controls the hydraulic cylinder 14 to drive the lifting platform 4 to rise. During the rising process of the lifting platform 4, the sampling tube 6 that rises with the lifting platform 4 achieves layered sampling.

[0056] Step 10: The rising lifting platform 4 touches the lifting sensor 402. The lifting sensor 402 transmits the signal that the lifting platform 4 has reached the upper limit to the PLC controller 15. The PLC controller 15 controls the hydraulic cylinder 14 to stop, and the lifting platform 4 stops rising.

[0057] Step 11: After the lifting platform 4 stops rising, the PLC controller 15 controls the sampling valve 702 and the vacuum generator 803 to close.

[0058] Step 12: After the sampling valve 702 and the vacuum generator 803 are closed, the PLC controller 15 controls the argon gas filling valve 806 on the sample receiving chamber 8 to open and introduce argon gas into the sample receiving chamber 8 which is under negative pressure.

[0059] Step 13: When the pressure inside the sample chamber 8 is at atmospheric pressure, the PLC controller 15 controls the argon gas filling valve 806 to close.

[0060] Step 14: After the argon gas filling valve 806 is closed, the PLC controller 15 controls the push rod 13 to retract, and the push rod 13 drives the moving trolley 10 to move towards the starting position.

[0061] Step 15: When the moving trolley 10 touches the stop sensor 1002 at the starting position, the stop sensor 1002 transmits a reset signal of the moving trolley 10 to the PLC controller 15, and the PLC controller 15 controls the moving trolley 10 to stop moving.

[0062] Step 16: After the moving trolley 10 stops moving, the PLC controller 15 controls the hydraulic cylinder 14 to drive the lifting platform 4 to descend. The lifting platform 4 descends and touches the descent sensor 403. The descent sensor 403 transmits the signal that the lifting platform 4 has reached the lower limit to the PLC controller 15. The PLC controller 15 controls the hydraulic cylinder 14 to stop, and the lifting platform 4 stops descending.

[0063] Step 17: After the lifting platform 4 stops descending, the PLC controller 15 controls all valves to close and removes the material bucket 11 from the moving trolley 10, thus ending this sampling.

[0064] After the sampling in step 17 is completed, a packaging bag is placed over the nozzle of the discharge funnel 801, the manual valve 802 is opened, and the sample is discharged and packaged. After packaging is completed, the manual valve 802 is closed to prepare for the next sampling.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A vacuum sampling device for rapidly quenched NdFeB magnetic powder, characterized in that, Includes base plate, columns, guide rails, lifting platform, sampling tube, gas pipeline and sample receiving chamber; At least two columns are vertically provided on the top surface of the base plate, and a crossbeam is provided between the tops of the columns; two or more guide rails are vertically provided between the top surface of the base plate and the crossbeam between the columns. The lifting platform is slidably mounted on the guide rail; a lifting mechanism is provided between the top surface of the base plate and the bottom surface of the lifting platform; one or more vertically arranged sampling tubes are separately and movably mounted on the lifting platform; the top end of the sampling tube is positioned above the top surface of the lifting platform, and a quick connector is provided at the top end of the sampling tube; the sampling tube is connected to the gas pipeline through the quick connector, and the outlet of the gas pipeline is connected to the inlet of the sample receiving chamber; the bottom end of the sampling tube is positioned below the bottom surface of the lifting platform, and a sampling nozzle is movably mounted at the bottom end of the sampling tube; the lifting mechanism is any one of a hydraulic cylinder, an electric telescopic rod, or a pneumatic cylinder. An argon gas inlet valve and a sampling valve are sequentially installed on the gas pipeline from the sampling tube to the sample receiving chamber; A vacuum generator, an argon gas filling valve, a pressure gauge, and an observation hole are installed at the top of the sample receiving chamber. A discharge funnel is installed at the bottom of the sample receiving chamber. A manual valve is installed at the nozzle of the discharge funnel. A vibrator is installed on the inclined outer wall of the discharge funnel.

2. The vacuum sampling device for rapidly quenched NdFeB magnetic powder according to claim 1, characterized in that, The lifting platform is placed between the guide rails, and a sleeve is slidably fitted on the guide rails. The outer wall of the sleeve is fixedly connected to the side wall of the lifting platform.

3. The vacuum sampling device for rapidly quenched NdFeB magnetic powder according to claim 1, characterized in that, It also includes tracks, a moving trolley, a push rod, and a material bucket; two horizontally arranged tracks are provided parallel to each other on the top surface of the base plate between the columns, and the moving trolley is provided on the tracks for reciprocating movement; the material bucket is separately placed on the moving trolley; the push rod is hinged to the base plate below the end of the track away from the lifting platform, and the telescopic end of the push rod is movably hinged to the bottom of the moving trolley.

4. The vacuum sampling device for rapidly quenched NdFeB magnetic powder according to claim 3, characterized in that, It also includes a PLC controller, a rise sensor, a fall sensor, a trolley sensor, and a stop sensor; the rise sensor and the fall sensor are arranged sequentially from top to bottom on any of the guide rails; the trolley sensor is arranged at one end of the rail located below the lifting platform, and the stop sensor is arranged at the other end of the rail away from the lifting platform; The rising sensor, the falling sensor, the trolley sensor, and the termination sensor are all electrically connected to the PLC controller and send electrical signals to the PLC controller; the argon gas inlet valve, the sampling valve, the vacuum generator, the argon gas filling valve, the lifting mechanism, and the push rod are all electrically connected to the PLC controller and are controlled by the PLC controller to start and stop.

5. A method for using a vacuum sampling device for rapidly quenched NdFeB magnetic powder as described in any one of claims 1-4, characterized in that, It includes the following steps: Step 1, Sampling preparation: All valves are closed, the moving trolley is in contact with the termination sensor, the moving trolley is at the starting position away from the lifting platform, the lifting platform is in contact with the descent sensor, and the lifting platform is at the lower limit position; place the bucket containing the material to be sampled on the moving trolley. Step 2: The PLC controller controls the lifting mechanism to drive the lifting platform to rise. At the same time as the lifting platform rises, the PLC controller controls the argon gas inlet valve to open, and argon gas with a pressure of 2-4MPa is introduced into the gas pipeline and sampling tube and sprayed out from the sampling gun head. Step 3: The rising lifting platform touches the lifting sensor, which transmits the signal that the lifting platform has reached the upper limit to the PLC controller. The PLC controller controls the lifting mechanism to stop, and the lifting platform stops rising. The bottom of the sampling gun head under the lifting platform is placed above the opening of the material bucket. Step 4: After the lifting platform stops rising, the PLC controller controls the push rod to extend, and the push rod pushes the moving trolley to move downwards from the lifting platform. Step 5: The moving trolley touches the trolley sensor, and the trolley sensor transmits the signal of the moving trolley's arrival to the PLC controller. The PLC controller controls the push rod to stop extending, and the moving trolley stops moving, so that the material bucket is placed below the lifting platform. Step 6: After the moving trolley stops moving, the PLC controller controls the lifting mechanism to drive the lifting platform to descend. During the descent of the lifting platform, the sampling gun head below the lifting platform is inserted into the material to be sampled in the material bucket below. Step 7: The descending lifting platform touches the descent sensor. The descent sensor transmits the signal that the lifting platform has reached the lower limit to the PLC controller. The PLC controller controls the lifting mechanism to stop, and the lifting platform stops descending. At the same time as the lifting platform stops descending, the PLC controller controls the argon gas inlet valve to close. Step 8: After the PLC controller closes the argon gas inlet valve, the vacuum generator is turned on; after the vacuum generator is turned on, the pressure gauge transmits the pressure signal in the sample receiving chamber to the PLC controller. Step 9: When the pressure in the sample chamber is negative 4-6MPa, the PLC controller controls the sampling valve to open. At the same time, the PLC controller controls the lifting mechanism to drive the lifting platform to rise. During the rising process of the lifting platform, the sampling nozzles that rise with the lifting platform achieve layered sampling. Step 10: The rising lifting platform touches the lifting sensor, which transmits a signal that the lifting platform has reached the upper limit to the PLC controller. The PLC controller then controls the lifting mechanism to stop, and the lifting platform stops rising. Step 11: After the lifting platform stops rising, the PLC controller controls the sampling valve and vacuum generator to shut down; Step 12: After the sampling valve and vacuum generator are closed, the PLC controller controls the argon gas filling valve on the sample receiving chamber to open, and argon gas is introduced into the sample receiving chamber which is under negative pressure. Step 13: When the pressure inside the sample chamber is at atmospheric pressure, the PLC controller controls the argon gas filling valve to close. Step 14: After the argon gas filling valve is closed, the PLC controller controls the push rod to retract, and the push rod drives the moving trolley to move towards the starting position. Step 15: When the moving trolley touches the stop sensor at the starting position, the stop sensor transmits a reset signal to the PLC controller, and the PLC controller controls the moving trolley to stop moving. Step 16: After the moving trolley stops moving, the PLC controller controls the lifting mechanism to drive the lifting platform to descend. When the lifting platform descends and touches the descent sensor, the descent sensor transmits the signal that the lifting platform has reached the lower limit to the PLC controller. The PLC controller then controls the lifting mechanism to stop, and the lifting platform stops descending. Step 17: After the lifting platform stops descending, the PLC controller controls all valves to close and removes the material bucket from the mobile trolley, thus ending this sampling.

6. The method for vacuum sampling of neodymium iron boron rapid quenching magnetic powder according to claim 5, characterized in that, After the sampling in step 17 is completed, a packaging bag is placed over the nozzle of the discharge funnel, the manual valve is opened, the sample is discharged and packaged, and after packaging is completed, the manual valve is closed to prepare for the next sampling.

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