A high-toughness magnesium alloy powder making device and preparation method thereof

Abstract

A high-toughness magnesium alloy powder making device and a preparation method thereof, which relates to a powder making device and a preparation method thereof. The present invention is to solve the problems of easy plastic deformation, low powder yield and decreased hydrogen storage performance of magnesium alloy powder in the existing preparation of magnesium alloy powder. The present invention drives the gear set to rotate through a motor, driving the grinding disc and the driven gear to rotate coaxially, so as to achieve the effect of adjustable grinding disc speed during grinding. The grinding disc feed is controlled by a hydraulic lifting device, and the feed amount and feed speed are set according to the required amount of powder or the height of the sample exposed in the slot. The device sets the grinding disc to the lowest position and still reserves a safe distance from the slot. Put the magnesium alloy sample into the concave position of the base and determine the height of the sample exposed in the slot, evacuate; introduce protective gas; start the circulating water pump of the cooling system; adjust the grinding disc height to grind and collect the powder. The present invention is used for high-toughness magnesium alloy powder making.

Description

Technical Field

[0001] The invention relates to a powder making device and a preparation method thereof, in particular to a high-toughness magnesium alloy powder making device and a preparation method thereof, and belongs to the field of hydrogen storage magnesium alloy powder making. Background Art

[0002] Driven by the goals of "carbon neutrality" and "carbon peak", our society urgently needs a systematic transformation towards low carbonization. Hydrogen energy, due to its zero carbon content, is an ideal energy carrier for achieving the "dual carbon" goal. Hydrogen energy applications are mainly divided into hydrogen preparation, storage and transportation, and terminal utilization. At present, the safe storage and transportation of hydrogen is still the "bottleneck" link in the application of hydrogen energy. Therefore, it is urgent to develop safe, efficient, economical and practical hydrogen storage methods. Solid-state hydrogen storage is favored because of its high safety and convenient transportation. Among them, hydrogen storage alloys are one of the application materials for solid-state hydrogen storage. Increasing the specific surface area of ​​the alloy can effectively improve the hydrogen absorption and desorption efficiency of the alloy, that is, preparing the alloy into small-sized particles or powders. Magnesium alloys have become a research hotspot in the field of hydrogen storage material applications due to their high hydrogen storage density (7.6wt.%), low cost, good cycle performance and high safety.

[0003] At present, the most commonly used powder making method for hydrogen storage magnesium alloy is high-energy ball milling, which is more suitable for alloy materials with a brittle texture. Its working principle is: by controlling the rotation speed of the powder making tank and the ball milling time, multiple steel balls in the tank collide with the inner wall of the tank and the alloy in the tank, and the alloy is broken into powder through fierce collision. This kind of high-energy ball milling method will generate a lot of heat in the process of collision between the steel balls and the alloy and the tank, and the alloy is more prone to plastic deformation under the action of force, resulting in the magnesium alloy with better plasticity cannot be broken, but plastic deformation into thin sheets wrapped on the steel balls, which leads to a low powder yield of the magnesium alloy.

[0004] In summary, when the existing technology prepares magnesium alloy powder with high plasticity, plastic deformation is prone to occur, and the powder yield is low due to the adhesion of magnesium alloy particles to the grinding balls; in addition, due to the high temperature generated during the powder making process, the magnesium alloy has active chemical properties and is easily oxidized, resulting in a problem of reduced hydrogen storage performance. Summary of the invention

[0005] The purpose of the present invention is to solve the problems of easy plastic deformation, low powder yield and decreased hydrogen storage performance of magnesium alloy powder when preparing magnesium alloy powder with high plasticity in the prior art, and further provide a high-toughness magnesium alloy powder making device and preparation method thereof.

[0006] The technical solution of the present invention is: a high-toughness magnesium alloy powder making device, including a mechanical grinding system, a powder particle collection system, a cooling system and an atmosphere control system, the powder particle collection system includes a powder collection box, a first powder collection cylinder, a second powder collection cylinder and a box base, the powder collection box is a cylindrical box, the interior of the powder collection box is provided with a downwardly inclined annular baffle, the annular baffle divides the interior of the cylindrical box into two cavities, the upper cavity is a conical inner cavity, and the lower cavity is an annular collection cavity, the box base is installed in the powder collection box, and the box base protrudes upward and extends to the cone shaped inner cavity, a first powder collecting cylinder and a second powder collecting cylinder are installed on the outer side of the lower part of the box base, an inner concave clamping position is provided on the upper part of the box base, the magnesium alloy sample can be detachably clamped in the inner concave clamping position, and an inclination is set on the top of the inner concave clamping position, which is conducive to the powder falling smoothly into the powder collecting cylinder, and a cooling column is provided at the lower part of the box base; the cooling system is installed on the cooling column, the atmosphere control system is connected to the powder collecting box, the mechanical grinding system is installed on the upper part of the powder collecting box, and the grinding disc of the mechanical grinding system is extended into the powder collecting box to grind the magnesium alloy sample, and the grinding disc does not contact the inner concave clamping position when it descends to the lowest position.

[0007] Furthermore, the mechanical grinding system includes a grinding system case, a driven gear, a driving gear, a driving motor, a motor control cabinet, a grinding disc, a hydraulic device and a hydraulic device control cabinet. The grinding system case is installed directly above the powder collecting case, the driving motor is installed in the grinding system case, the motor control cabinet is electrically connected to the driving motor, the output shaft of the driving motor is connected to the driving gear, the driven gear is installed in the grinding system case and meshes with the driving gear, the axle of the driven gear rotates downward in sequence through the bottom wall of the grinding system case and the top wall of the powder collecting case and then extends into the powder collecting case, the grinding disc is installed on the lower end face of the axle of the driven gear, the hydraulic device is installed between the grinding system case and the powder collecting case, and the hydraulic device drives the grinding system case to rise and fall under the control of the hydraulic device control cabinet.

[0008] Furthermore, the mechanical grinding system also includes an observation window, and the observation window is provided on the grinding system box.

[0009] Furthermore, the mechanical grinding system also includes a bearing, and the grinding system housing and the axle of the driven gear are rotatably connected through the bearing.

[0010] Furthermore, the mechanical grinding system also includes a high temperature resistant sealing ring, and the axle of the driven gear and the top wall of the powder collecting box are sealed and connected via the high temperature resistant sealing ring.

[0011] Furthermore, grinding edges with different particle sizes are provided on the lower end surface of the grinding disc.

[0012] Furthermore, the atmosphere control system includes a pressure gauge, an air inlet valve, a protective gas tank, a vacuum pump and a vacuum valve. The protective gas tank is connected to the conical inner cavity of the powder collecting box through a pipeline, and the air inlet valve and the pressure gauge are installed on the pipeline; the vacuum pump is connected to the annular collecting cavity of the powder collecting box through a pipeline, and the vacuum valve is installed on the pipeline.

[0013] Furthermore, the cooling system includes a circulating water pump and a circulating pipeline, and the circulating pipeline is wound around the cooling column and then connected in series with the circulating water pump.

[0014] The present invention also provides a preparation method using the above-mentioned high-toughness magnesium alloy powder making device, which comprises the following steps:

[0015] Step 1: Cut the magnesium alloy block to be powdered according to the size of the concave position of the base, and clean and remove the oil on the surface of the sample;

[0016] Step 2: Use the hydraulic device control cabinet to raise the grinding plate to the highest position for easy setting out;

[0017] Step 3: Place the magnesium alloy sample into the recessed position of the base and determine the height of the sample that exposes the slot. Close the hatch, turn on the vacuum pump, and then open the vacuum valve. After the pressure gauge indicates 0.001 MPa, continue to evacuate for 5-10 minutes, close the vacuum valve, and then turn off the vacuum pump.

[0018] Step 4: Open the valve of the protective gas tank, open the air inlet valve, observe the pressure gauge until the indication indicates 0.1MPa, then close the air inlet valve, and then close the valve of the protective gas tank;

[0019] Step 5: Turn on the cooling system circulating water pump;

[0020] Step 6: According to the height of the magnesium alloy sample exposed from the inner recess of the base and the required powder amount, set the initial position and the descending height of the grinding disc through the control cabinet;

[0021] Step 7: Turn on the switch of the motor control cabinet and set the output of the drive motor to control the speed of the grinding disc;

[0022] Step 8: When the feeding amount of the grinding disc reaches the height set by the hydraulic device control cabinet, the hydraulic device control cabinet prompts, the motor control cabinet turns off the motor, the grinding disc stops rotating, and the hydraulic device control cabinet controls the grinding disc to rise and reset;

[0023] Step 9: Open the hatch, take out the powder collecting tube, and take out the obtained powder particles;

[0024] Step 10: Take out the remaining samples after they have cooled down, and turn off the circulating water pump.

[0025] Furthermore, the motor control cabinet controls the rotation speed of the grinding disc to operate at a rotation speed of 60 rpm to 120 rpm to prevent the temperature of the sample 15 from rising and causing phase change.

[0026] Compared with the prior art, the present invention has the following effects:

[0027] 1. The present invention drives the gear set to rotate through a motor, driving the grinding disc and the driven gear to rotate coaxially, thereby achieving the effect of adjustable grinding disc speed during grinding. It can effectively avoid excessively high temperatures at the contact surface between the grinding disc and the sample due to excessive rotation speed, thereby avoiding phase changes of the alloy due to high temperature, and efficiently producing high-toughness magnesium alloy powder within an adjustable range. The grinding disc feed is controlled by a hydraulic lifting device, and the feed amount and feed speed are set according to the amount of powder required or the height of the sample exposed in the slot. The device sets the grinding disc to a safe distance from the slot when it is lowered to the lowest point, which can effectively avoid safety accidents or affect the quality of powder making during the powder making process.

[0028] 2. The powder produced by this equipment has a finer particle size and the particle surface is serrated. Figure 2 and Figure 3 As shown, such a particle morphology increases the specific surface area of ​​the particles, which is conducive to the alloy particles fully contacting with hydrogen during the hydrogen storage process, thereby obtaining a faster hydrogen storage rate. The oxide on the surface of the magnesium alloy particles for hydrogen storage will greatly hinder the hydrogen absorption process. During the mechanical grinding process, the present invention sets the interior of the closed box to a high-purity protective gas atmosphere to ensure that the magnesium alloy does not contact with oxygen during the grinding process, thereby avoiding oxidation of the powder and preparing high-quality magnesium alloy powder for hydrogen storage.

[0029] 3. The present invention is designed to use a cylindrical conical cavity and a conical slot to facilitate the acceptance, powder dropping and collection of powder particles, avoid dead corners, and facilitate cleaning. The use of a circulating water cooling system in the base of the box can further ensure that the magnesium alloy sample undergoes phase change when the temperature rises during the grinding process, thereby ensuring the stability of the composition and structure of the magnesium alloy particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0031] Figure 2 The present invention discloses a high-toughness magnesium alloy powder morphology prepared by using the device of the present invention.

[0032] Figure 3 yes Figure 2 A magnified view of the part in the rectangular frame. DETAILED DESCRIPTION

[0033] Specific implementation method 1: Combination Figure 1The present embodiment is described. The present embodiment includes a mechanical grinding system, a powder particle collection system, a cooling system and an atmosphere control system. The powder particle collection system includes a powder collection box 9, a first powder collection barrel 10-1, a second powder collection barrel 10-2 and a box base 11. The powder collection box 9 is a cylindrical box. The interior of the powder collection box 9 is provided with a downwardly inclined annular baffle 9-1. The annular baffle 9-1 divides the interior of the cylindrical box into two cavities. The upper cavity is a conical inner cavity 9-2, and the lower cavity is an annular collection cavity 9-3. The box base 11 is installed in the powder collection box 9, and the box base 11 protrudes upward and extends into the conical inner cavity 9-2. The lower part of the box base 11 A first powder collecting cylinder 10-1 and a second powder collecting cylinder 10-2 are installed on the outside, a concave clamping position 11-1 is provided on the upper part of the box base 11, and a slope is set on the top of the concave clamping position 11-1, which is conducive to the powder falling smoothly into the powder collecting cylinder 10, and the magnesium alloy sample 15 can be detachably clamped in the concave clamping position 11-1, and a cooling column 11-2 is provided at the lower part of the box base 11; the cooling system is installed on the cooling column 11-2, the atmosphere control system is connected to the powder collecting box 9, the mechanical grinding system is installed on the upper part of the powder collecting box 9, and the grinding disc 16 of the mechanical grinding system is extended into the powder collecting box 9 to grind the magnesium alloy sample 15, and the grinding disc 16 does not contact the concave clamping position 11-1 when it drops to the lowest position.

[0034] In this embodiment, the internal structure of the powder collecting box 9 is provided with a downwardly inclined annular baffle 9-1, so that the alloy powder ground off by the grinding disc can slide smoothly and quickly into the first powder collecting tube 10-1 and the second powder collecting tube 10-2 under the guidance of the annular baffle 9-1. The alloy powder and alloy particles are smoothly collected. It is convenient to receive the powder centrifugally moved due to the high-speed rotation of the grinding disc 16, and there is no dead angle in the cavity, which is convenient for powder falling and collection.

[0035] In this embodiment, the grinding disc 16 is used to grind the alloy sample. At this time, the grinding end surface of the grinding disc is always facing downward, and the ground powder and particles fall down due to gravity, thereby minimizing the adhesion of the powder and ensuring the powder extraction rate.

[0036] The magnesium alloy sample 15 of this embodiment is fixed in the box base 11. The upper end of the box base 11 is concave and has a square shape to prevent the magnesium alloy sample 15 from rotating during the grinding process.

[0037] The small opening end of the conical inner cavity 9-2 in the powder collecting box 9 of this embodiment faces downward and abuts against the first powder collecting tube 10-1 and the second powder collecting tube 10-2, and the small opening diameter of the conical inner cavity 9-2 is smaller than the diameter of the first powder collecting tube 10-1 and the second powder collecting tube 10-2, the first powder collecting tube 10-1 and the second powder collecting tube 10-2 abut against the box base 11, and the cooling system abuts against the box base 11. The internal space of the powder collecting box 9 is large enough to facilitate the placement of the first powder collecting tube 10-1 and the second powder collecting tube 10-2 side by side.

[0038] The box base 11 of this embodiment is used in conjunction with the cooling system 12 to prevent the magnesium alloy sample 15 from generating excessively high friction heat and causing phase change during the grinding process.

[0039] Specific implementation method 2: Combination Figure 1 The present embodiment is described. The mechanical grinding system of the present embodiment includes a grinding system case 21, a driven gear 2, a driving gear 3, a drive motor 4, a motor control cabinet 5, a grinding disc 16, a hydraulic device 19 and a hydraulic device control cabinet 18. The grinding system case 21 is installed just above the powder collecting case 9, the drive motor 4 is installed in the grinding system case 21, the motor control cabinet 5 is electrically connected to the drive motor 4, the output shaft of the drive motor 4 is connected to the driving gear 3, the driven gear 2 is installed in the grinding system case 21 and meshes with the driving gear 3, the axle of the driven gear 2 rotates downward in sequence, passes through the bottom wall of the grinding system case 21 and the top wall of the powder collecting case 9, and then extends into the powder collecting case 9, the grinding disc 16 is installed on the lower end surface of the axle of the driven gear 2, the hydraulic device 19 is installed between the grinding system case 21 and the powder collecting case 9, and the hydraulic device 19 drives the grinding system case 21 to rise and fall under the control of the hydraulic device control cabinet 18.

[0040] In this configuration, the grinding disc 16 rotates coaxially with the driven gear 2, so the rotation speed of the grinding disc 16 can be controlled by controlling the rotation speed of the driving wheel 3 through the motor control cabinet 5, and the grinding disc 16 is raised and lowered under the control of the hydraulic device 19, and the feed amount and feed speed of the grinding disc 16 are controlled by the hydraulic control cabinet 18, so that the grinding state of the grinding disc 16 on the magnesium alloy sample 15 can be controlled according to the amount of magnesium alloy powder. Other components and connection relationships are the same as those in the first embodiment.

[0041] The main shaft of the grinding disc 16 of this embodiment passes through a small hole above the powder collecting box 9 and rotates inside the powder collecting box 9 . A high temperature resistant sealing ring 17 is provided at the small hole above the powder collecting box 9 .

[0042] Specific implementation method three: Combination Figure 1To explain this embodiment, the mechanical grinding system of this embodiment further includes an observation window 1, and an observation window 1 is provided on the grinding system housing 21. This arrangement facilitates the observation of the working condition of the driving mechanism inside the grinding system housing 21 at any time. The other components and connection relationships are the same as those of the first or second embodiment.

[0043] Specific implementation method four: Combination Figure 1 To explain this embodiment, the mechanical grinding system of this embodiment further includes a bearing 20, and the grinding system housing 21 and the axle of the driven gear 2 are rotatably connected through the bearing 20. This arrangement facilitates the transmission of the power of the driven gear 2 to the grinding disc without loss. Other components and connection relationships are the same as those of the first, second or third embodiments.

[0044] Specific implementation method five: Combination Figure 1 To explain this embodiment, the mechanical grinding system of this embodiment further includes a high temperature resistant sealing ring 17, and the axle of the driven gear 2 and the top wall of the powder collecting box 9 are sealed and connected via the high temperature resistant sealing ring 17. With such a configuration, in actual use, in order to ensure that the rotating shaft of the driven gear 2 can rotate smoothly, an oil seal is provided between the rotating shaft and the high temperature resistant sealing ring 17, which can not only ensure the lubrication of the rotating shaft, but also reduce the friction between the rotating shaft and the high temperature resistant sealing ring 17. The other components and connection relationships are the same as those of the specific embodiments one, two, three or four.

[0045] Specific implementation method six: Combination Figure 1 To explain this embodiment, the lower end surface of the grinding disc 16 of this embodiment is provided with grinding blades of different particle sizes. This arrangement facilitates the selection of a suitable grinding particle size according to actual use needs to achieve the preparation of powders and particles. The other components and connection relationships are the same as those of the specific embodiments one, two, three, four or five.

[0046] Specific implementation method seven: Combination Figure 1 This embodiment is described. The atmosphere control system of this embodiment includes a pressure gauge 6, an air inlet valve 7, a protective gas tank 8, a vacuum pump 14 and a vacuum valve 13. The protective gas tank 8 is connected to the conical inner cavity 9-2 of the powder collecting box 9 through a pipeline, and the air inlet valve 7 and the pressure gauge 6 are installed on the pipeline; the vacuum pump 14 is connected to the annular collecting cavity 9-3 of the powder collecting box 9 through a pipeline, and the vacuum valve 13 is installed on the pipeline. In this way, in order to prevent oxidation during the grinding process, the atmosphere control system is set. The protective gas tank 8 in the protective gas tank 8 is controlled by the air inlet valve 7 to control the air intake, and the air inlet valve 7 is controlled by the pressure gauge 6 in the chamber. Other components and connection relationships are the same as those of the specific embodiments one, two, three, four, five or six.

[0047] Specific implementation method eight: Combination Figure 1To explain this embodiment, the cooling system of this embodiment includes a circulating water pump 12 and a circulating pipeline, and the circulating pipeline is wound around the cooling column 11-2 and connected in series with the circulating water pump 12. This arrangement facilitates cooling the box base 11 and the entire powder collecting box 9. Other components and connection relationships are the same as any one of the specific embodiments 1 to 7.

[0048] Specific implementation method nine: Combination Figure 1 The present embodiment is described. A method for preparing a high-toughness magnesium alloy powder making device in the present embodiment comprises the following steps:

[0049] Step 1: Cut the magnesium alloy block to be powdered according to the size of the inner concave position 11-1 of the base, and clean and remove the oil stains on the surface of the sample;

[0050] Step 2: Use the hydraulic device control cabinet 18 to raise the grinding disc 16 to the highest position for easy setting out;

[0051] Step 3: Place the magnesium alloy sample 15 into the recessed position 11-1 of the base and determine the height of the sample that is exposed from the slot, close the hatch, turn on the vacuum pump 14, and then open the vacuum valve 13. After the pressure gauge 6 indicates 0.001 MPa, continue to evacuate for 5-10 minutes, close the vacuum valve 13, and then turn off the vacuum pump 14;

[0052] Step 4: Open the valve of the protective gas tank 8, open the air inlet valve 7, observe the pressure gauge 6 until the reading indicates 0.1 MPa, then close the air inlet valve 7, and then close the valve of the protective gas tank 8;

[0053] Step 5: Turn on the cooling system circulating water pump 12;

[0054] Step 6: according to the height of the magnesium alloy sample 15 exposed from the inner recessed position 11 - 1 of the base and the required powder quantity, the initial position and the descending height of the grinding disc 16 are set through the control cabinet 18 ;

[0055] Step 7: Turn on the switch of the motor control cabinet 5 and set the output of the drive motor 4 to control the rotation speed of the grinding disc 16;

[0056] Step 8: When the feeding amount of the grinding disc 16 reaches the height set by the hydraulic device control cabinet 18, the hydraulic device control cabinet 18 prompts, the motor control cabinet 5 turns off the motor 4, the grinding disc stops rotating, and the hydraulic device control cabinet 18 controls the grinding disc 16 to rise and reset;

[0057] Step 9: Open the hatch, take out the powder collecting tube, and take out the obtained powder particles;

[0058] Step 10: After the remaining sample 15 is cooled, take it out and turn off the circulating water pump 12.

[0059] Specific implementation method ten: Combination Figure 1To explain this embodiment, the motor control cabinet 5 of this embodiment controls the grinding disc speed to run at a speed of 60 rpm to 120 rpm. This arrangement can effectively prevent the temperature of the sample 15 from rising and causing phase change. The other components and connection relationships are the same as any one of the specific embodiments 1 to 9.

[0060] Combination Figure 1 The working principle of the present invention is described:

[0061] A high-toughness magnesium alloy powder making device includes a mechanical grinding system, a powder particle collection system, a cooling system, and an atmosphere control system. The mechanical grinding system includes a box 21 with an observation window 1, a driving gear 3, a driven gear 2 meshing with the driving gear, a motor 4 and a control cabinet 5 for controlling the driving gear, a bearing 20, a hydraulic device 19 and a control cabinet 18 for controlling the lifting of the mechanical grinding system, and a grinding disc 16 coaxially rotating with the driven gear. The grinding disc 16 rotates coaxially with the driven gear 2, so the speed of the grinding disc 16 can be controlled by controlling the speed of the driving wheel 3 through the motor control cabinet 5, and the grinding disc 16 is lifted and lowered under the control of the hydraulic device 19, and the feeding amount and feeding speed of the grinding disc are controlled by the hydraulic control cabinet 18, so that the grinding state of the grinding disc 16 on the magnesium alloy sample 15 can be controlled according to the amount of magnesium alloy powder. The present invention drives the gear set to rotate through the motor, drives the grinding disc and the driven gear to rotate coaxially, and achieves the effect of adjustable grinding disc speed during grinding. It can effectively avoid the excessive temperature of the contact surface between the grinding disc and the sample caused by too fast rotation speed, and efficiently produce high-toughness magnesium alloy powder within the adjustable range. The grinding disc feed is controlled by the hydraulic lifting device, and the feed amount and feed speed are set according to the required amount of powder or the height of the sample exposed in the slot.

[0062] In the present invention, the magnesium alloy sample 15 is fixed in the box base 11, and the upper end of the base is concave and has a square shape to prevent the magnesium alloy sample from rotating during the grinding process.

[0063] The magnesium alloy sample 15 is cut and processed according to the size of the base slot, and the surface oil and impurities should be polished and cleaned before being put into use to ensure the quality of the prepared magnesium alloy powder.

[0064] In the present invention, the powder particle collection system includes a circular conical inner cavity box 9, the small opening end of the conical cavity is downwardly facing the first powder collecting tube 10-1 and the second powder collecting tube 10-2 placed side by side, and the diameter of the small opening of the conical cavity is smaller than the diameter of the powder collecting tube, the powder collecting tube 10 is abutted against the box base 11, and the cooling system 12 is abutted against the box base 11. The use of a circulating water cooling system in conjunction with the box base can further ensure that the magnesium alloy sample undergoes a phase change when the temperature rises during the grinding process, thereby ensuring the stability of the composition and organization of the magnesium alloy particles.

[0065] In the present invention, the box is designed as a circular conical inner cavity, which is convenient for receiving the powder centrifugally moved due to the high-speed rotation of the grinding disc, and there is no dead angle in the cavity, which is convenient for powder falling and collection. In addition, the internal space below the powder making box is large enough to facilitate the placement of the powder collecting cylinder.

[0066] In the present invention, in order to prevent oxidation of magnesium alloy during grinding, an atmosphere control system is provided, including a vacuum pump 14, a vacuum valve 13 is provided between the vacuum pump 14 and the box body, the air intake of the protective gas tank body 8 is controlled by the air intake valve 7, and the air intake valve 7 is controlled by the pressure gauge 6 in the chamber. Usually, when vacuuming, the vacuum pump 14 is operated first and then the vacuum valve 13 is opened to pump the pressure in the chamber to -0.001MPa, and then the vacuum valve 13 is closed, and then the vacuum pump 14 is closed. When the protective gas is introduced, the protective gas tank body 8 is opened first, and the control valve 7 is opened after the airflow is stable, and the high-purity protective gas is introduced into the chamber until the pressure gauge reaches 0.1MPa. This step ensures that the powder collecting box is in a high-purity protective gas atmosphere.

[0067] The protective gas tank 8 in the present invention is preferably high-purity argon gas, but the protective gas is not limited to high-purity argon gas.

[0068] In the present invention, the main shaft connected to the grinding disc 16 passes through the small hole above the powder collecting box 9 and rotates inside the conical box. A high temperature resistant sealing ring 17 is provided at the small hole above the powder collecting box 9 to ensure the airtightness of the box 9. It is ensured that the magnesium alloy does not come into contact with oxygen during the grinding process, thereby avoiding oxidation of the powder and preparing high-quality magnesium alloy powder for hydrogen storage.

[0069] In the present invention, the driving motor 4 and its control cabinet 5, the hydraulic lifting device 19 and its hydraulic device control cabinet 18, the vacuum pump 14, and the circulating water cooling system 12 are all prior art.

[0070] Although the present invention has been disclosed as above in terms of preferred embodiments, this is not intended to limit the present invention. Those skilled in the art may also make other changes within the spirit of the present invention, and apply the present invention to fields not mentioned herein. Of course, these changes made in accordance with the spirit of the present invention should be included in the scope of protection claimed by the present invention.

Claims

1. A high-toughness magnesium alloy powder making device, characterized in that: It includes mechanical grinding system, powder particle collection system, cooling system and atmosphere control system. The powder particle collection system comprises a powder collection box (9), a first powder collection cylinder (10-1), a second powder collection cylinder (10-2) and a box base (11). The powder collection box (9) is a cylindrical box. A downwardly inclined annular baffle (9-1) is provided inside the powder collection box (9). The annular baffle (9-1) divides the interior of the cylindrical box into two cavities. The upper cavity is a conical inner cavity (9-2), and the lower cavity is an annular collection cavity (9-3). The box base (11) is installed on the collection box. The powder box (9) is provided with a box base (11) which protrudes upward and extends into the conical inner cavity (9-2). A first powder collecting cylinder (10-1) and a second powder collecting cylinder (10-2) are installed on the outer side of the lower part of the box base (11). A concave clamping position (11-1) is provided on the upper part of the box base (11). The magnesium alloy sample (15) is detachably clamped in the concave clamping position (11-1). The top of the concave clamping position (11-1) is provided with an inclination. A cooling column (11-2) is provided on the lower part of the box base (11); The cooling system is installed on the cooling column (11-2), the atmosphere control system is connected to the powder collecting box (9), the mechanical grinding system is installed on the upper part of the powder collecting box (9), and the grinding disc (16) of the mechanical grinding system extends into the powder collecting box (9) to grind the magnesium alloy sample (15), and the grinding disc (16) still does not contact the concave clamping position (11-1) when it descends to the lowest position.

2. A high-toughness magnesium alloy powder making device according to claim 1, characterized in that: The mechanical grinding system comprises a grinding system housing (21), a driven gear (2), a driving gear (3), a driving motor (4), a motor control cabinet (5), a grinding disc (16), a hydraulic device (19) and a hydraulic device control cabinet (18), wherein the grinding system housing (21) is installed directly above a powder collecting housing (9), the driving motor (4) is installed in the grinding system housing (21), the motor control cabinet (5) is electrically connected to the driving motor (4), the output shaft of the driving motor (4) is connected to the driving gear (3), the driven gear (2) is installed The driven gear (2) is installed in a grinding system housing (21) and meshes with a driving gear (3). The axle of the driven gear (2) rotates downward in sequence, passes through the bottom wall of the grinding system housing (21) and the top wall of the powder collecting housing (9), and then extends into the powder collecting housing (9). The grinding disc (16) is installed on the lower end surface of the axle of the driven gear (2). The hydraulic device (19) is installed between the grinding system housing (21) and the powder collecting housing (9), and the hydraulic device (19) drives the grinding system housing (21) to rise and fall under the control of a hydraulic device control cabinet (18).

3. A high-toughness magnesium alloy powder making device according to claim 2, characterized in that: The mechanical grinding system also includes an observation window (1), and the observation window (1) is provided on the grinding system box (21).

4. A high-toughness magnesium alloy powder making device according to claim 3, characterized in that: The mechanical grinding system also includes a bearing (20), and the grinding system housing (21) and the axle of the driven gear (2) are rotatably connected via the bearing (20).

5. A high-toughness magnesium alloy powder making device according to claim 4, characterized in that: The mechanical grinding system also includes a high temperature resistant sealing ring (17), and the axle of the driven gear (2) and the top wall of the powder collecting box (9) are sealed and connected via the high temperature resistant sealing ring (17).

6. A high-toughness magnesium alloy powder making device according to claim 2, 3, 4 or 5, characterized in that: The lower end surface of the grinding disc (16) is provided with grinding edges with different particle sizes.

7. A high-toughness magnesium alloy powder making device according to claim 6, characterized in that: The atmosphere control system comprises a pressure gauge (6), an air inlet valve (7), a protective gas tank body (8), a vacuum pump (14) and a vacuum valve (13); the protective gas tank body (8) is connected to a conical inner cavity (9-2) of a powder collecting box body (9) through a pipeline, and the air inlet valve (7) and the pressure gauge (6) are installed on the pipeline; the vacuum pump (14) is connected to an annular collecting cavity (9-3) of the powder collecting box body (9) through a pipeline, and the vacuum valve (13) is installed on the pipeline.

8. A high-toughness magnesium alloy powder making device according to claim 1 or 7, characterized in that: The cooling system comprises a circulating water pump (12) and a circulating pipeline, wherein the circulating pipeline is wound around a cooling column (11-2) and then connected in series with the circulating water pump (12).

9. A method for preparing a high-toughness magnesium alloy powder making device according to any one of claims 1 to 8, characterized in that: It includes the following steps: Step 1: Cut the magnesium alloy block to be powdered according to the size of the inner concave position (11-1) of the base, and clean and remove the oil stains on the surface of the sample; Step 2: Use the hydraulic device control cabinet (18) to raise the grinding disc (16) to the highest position to facilitate setting out; Step 3: Place the magnesium alloy sample (15) into the recessed position (11-1) of the base and determine the height of the sample that exposes the slot, close the hatch, turn on the vacuum pump (14), and then open the vacuum valve (13), and continue to evacuate for 5-10 minutes after the pressure gauge (6) indicates 0.001 MPa, close the vacuum valve (13), and then turn off the vacuum pump (14); Step 4: Open the valve of the protective gas tank (8), open the air inlet valve (7), observe the pressure gauge (6) until the reading indicates 0.1 MPa, then close the air inlet valve (7), and then close the valve of the protective gas tank body (8); Step 5: Turn on the cooling system circulating water pump (12); Step 6: according to the height of the magnesium alloy sample (15) exposed from the inner recessed position (11-1) of the base and the required powder quantity, the initial position and the descending height of the grinding disc (16) are set through the control cabinet (18); Step 7: Turn on the switch of the motor control cabinet (5) and set the output of the drive motor (4) to control the rotation speed of the grinding disc (16); Step 8: When the feeding amount of the grinding disc (16) reaches the height set by the hydraulic device control cabinet (18), the hydraulic device control cabinet (18) prompts that the motor control cabinet (5) turns off the motor (4) to stop the grinding disc from rotating, and the hydraulic device control cabinet (18) controls the grinding disc (16) to rise and reset; Step 9: Open the hatch, take out the powder collecting tube, and take out the obtained powder particles; Step 10: After the remaining sample (15) is cooled, take it out and turn off the circulating water pump (12).

10. The method for preparing a high-toughness magnesium alloy powder making device according to claim 9, characterized in that: The motor control cabinet (5) controls the rotation speed of the grinding disc to operate at a rotation speed of 60 rpm to 120 rpm.

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