Preparation method of hydrogen storage material

Abstract

The invention discloses a preparation method of a hydrogen storage material, and relates to the technical field of hydrogen storage materials, the preparation method of the hydrogen storage material comprises the following steps: 1, preparing raw materials; secondly, an alloy casting is prepared; 3, hydrogen storage particles are prepared; 4, preparing a mixed solution; and 5, hydrogen storage material mixing treatment. According to the method, a smelting method and a mechanical alloying method are combined, the raw materials can be preliminarily fused in a melting mode before ball-milling machining is conducted on the raw materials, so that the fusion effect of the hydrogen storage alloy can be better during ball-milling, meanwhile, during ball-milling, the interior of a ball-milling tank is repeatedly inflated and deflated, and the fusion effect of the hydrogen storage alloy is improved. According to the method, the ball-milling effect can be guaranteed, the ball-milling time can be shortened, the ball-milling cost is reduced, and the activation condition is effectively reduced and the activation period is shortened through the effect of improving the activation performance of the alloy by the excessive titanium metal.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen storage materials, and in particular to a method for preparing a hydrogen storage material. Background Art

[0002] Hydrogen storage materials are a type of material that can reversibly absorb and release hydrogen. They include alloy hydrogen storage materials, inorganic and organic hydrogen storage materials, nano hydrogen storage materials, carbonaceous hydrogen storage materials, coordinated hydride hydrogen storage and hydrate hydrogen storage, etc., with a wide variety.

[0003] The existing technology has the following problems:

[0004] When preparing existing hydrogen storage alloy materials, mechanical alloying method is mostly used to process the hydrogen storage alloy materials. However, the hydrogen storage alloy materials processed by the existing mechanical alloying method have the problems of high activation conditions, long activation cycle, and poor hydrogen absorption and desorption performance. At the same time, as the use time of the hydrogen storage material increases, powdering phenomenon will appear on the surface of the material, and the service life is short and the hydrogen storage capacity is seriously affected. In addition, when the raw materials are ball-milled in the existing mechanical alloying method, it is only achieved by the rotation of the ball mill itself, which makes the ball milling effect poor and is not conducive to the preparation of hydrogen storage alloy materials. Summary of the invention

[0005] The present invention provides a method for preparing a hydrogen storage material to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A method for preparing a hydrogen storage material, the method comprising the following steps:

[0008] Step 1: Preparation of raw materials;

[0009] Step 2: Preparation of alloy castings;

[0010] Step 3: Preparation of hydrogen storage particles;

[0011] Step 4: preparation of mixed solution;

[0012] Step 5: Mixing of hydrogen storage materials.

[0013] A further improvement of the technical solution of the present invention is that: the preparation of the raw materials requires the preparation of hydrogen storage metal raw materials, mixed solution raw materials, ammonia borane NH3BH3 and α-lithium nitride α-Li3N, the hydrogen storage metal raw materials include titanium powder, iron powder, manganese powder, cobalt powder, zirconium powder, nickel powder, copper powder, activated carbon, with a total mass of 200g and a particle size of 200 mesh; the mixed solution raw materials include tetrapropoxysilane, propanol and water.

[0014] A further improvement of the technical solution of the present invention is that the step 2 further includes the following steps:

[0015] A1: Prepare the hydrogen storage metal raw materials;

[0016] A2: Put the prepared raw material graphite crucible into the solid phase reaction furnace, heat it to 1600℃ under vacuum conditions, take it out after reacting for 5 hours, pour the liquid alloy into the copper casting mold to obtain the master alloy ingot;

[0017] A3: The master alloy ingot is crushed and screened.

[0018] A further improvement of the technical solution of the present invention is that the step three further includes the following steps:

[0019] B1: Put the sieved alloy powder into a ball mill, add the ball milling medium, the ball-to-material ratio is 1:15-25, and the ball milling medium uses stainless steel grinding balls with a particle size of 5mm;

[0020] B2: Use a vacuum pump to remove the air in the tank, fill it with 0.6-0.8MPa argon gas for gas protection, and repeat the filling and discharging of gas, each time for 3 minutes;

[0021] B3: Fix the ball mill jar on the ball mill, adjust the parameters such as the speed and time of the ball mill, take 1 hour as one operation cycle, run for 55 minutes in each cycle and stop for 5 minutes to prevent the temperature in the container from being too high;

[0022] B4: After ball milling, sieve out the alloy powder in the ball mill.

[0023] A further improvement of the technical solution of the present invention is that the step 4 further includes the following steps:

[0024] C1: tetrapropoxysilane and propanol are mixed in a ratio of 1:2 at a speed of 90-100 r / min to prepare a mixed solution 1;

[0025] C2: Propanol and water are stirred and mixed at a mixing ratio of 1:0.4 at a speed of 130-150 r / min to obtain a mixed solution 2;

[0026] C3: Finally, the mixed solution 1 and the mixed solution 2 are stirred at a mixing ratio of 1:2 at a speed of 70-90 r / min to obtain a mixed solution; wherein the temperature during the mixing and stirring is controlled within the range of 50-85°C.

[0027] A further improvement of the technical solution of the present invention is that the step five further includes the following steps:

[0028] D1: Add the hydrogen storage particles prepared in step 3 to the mixed solution prepared in step 4 and mix and stir them thoroughly. In this step, add appropriate amounts of ammonia borane NH3BH3 and α-lithium nitride α-Li 3N to the mixed solution to ensure that ammonia borane and α-lithium nitride are evenly distributed in the mixed solution and the hydrogen storage particles. During stirring, the temperature is controlled at 80-110°C, the mixing and stirring speed is 60-70r / min, and the stirring time is controlled at 40-60min;

[0029] D2: The mixed material is then poured into a molding mold for aging treatment at 25-40°C for 14-16 days to stabilize the material structure and further improve the hydrogen storage capacity.

[0030] A further improvement of the technical solution of the present invention is that the ball mill comprises a supporting base plate, a ball milling jar is arranged on the top of the supporting base plate, a ventilation device is arranged on the outer surface front side of the ball milling jar, supporting columns are fixedly connected to the left and right sides of the supporting base plate, a first motor is fixedly connected to the top of the supporting column, a transmission screw is fixedly connected to the output shaft of the first motor, a sliding groove 1 is provided on the opposite surfaces of the two supporting columns, the bottom end of the transmission screw penetrates into the interior of the sliding groove 1, a sliding cover plate is slidably connected to the inner surface of the two sliding grooves 1, threaded holes penetrating from top to bottom are provided on the left and right sides of the sliding cover plate, the inner surface of the threaded hole is threadedly connected to the outer surface of the transmission screw, fixing mechanisms are arranged on the left and right sides of the bottom of the sliding cover plate, and a ball milling stirring mechanism is fixedly connected to the top of the sliding cover plate.

[0031] A further improvement of the technical solution of the present invention is that the ball mill stirring mechanism includes a third motor, the third motor is fixedly connected to the top of the sliding cover plate, the output shaft of the third motor passes through the bottom of the sliding cover plate and is fixedly connected to a rotating shaft, the bottom end of the rotating shaft is fixedly connected to a rotating box, the left and right sides of the interior of the rotating box are movably connected with bevel gears, a bevel gear ring is meshed and connected above the outer surfaces of the two bevel gears, a connecting sleeve is fixedly connected to the top of the bevel gear ring, the connecting sleeve is arranged on the outer surface of the rotating shaft and the top end is fixedly connected to the bottom of the sliding cover plate, a rotating column is fixedly connected to the side of the bevel gear away from the bevel gear ring, the end of the rotating column away from the bevel gear passes through the outside of the rotating box and has four stirring blades in a circular array on the outer surface.

[0032] A further improvement of the technical solution of the present invention is that: the fixing mechanism includes a second motor, sliding grooves 2 are provided on the left and right sides of the bottom of the sliding cover plate, the second motor is fixedly connected to the inner surface of the sliding groove 2 close to the side of the ball mill, the output shaft of the second motor is fixedly connected to a threaded column, the outer surface of the threaded column is threadedly connected to a sliding splint, the front and rear sides of the sliding splint are slidably connected to guide columns that penetrate left and right, the guide columns are fixedly connected to the inside of the sliding groove 2, and the bottom of the sliding splint is fixedly connected to a rubber pad on the side close to the ball mill.

[0033] Due to the adoption of the above technical solution, the present invention has the following technical advances compared with the prior art:

[0034] 1. The present invention provides a method for preparing a hydrogen storage material. By combining a smelting method with a mechanical alloying method, the raw materials can be initially fused by melting before ball milling, so that the fusion effect of the hydrogen storage alloy can be better during ball milling. At the same time, during ball milling, the gas is repeatedly filled and discharged inside the ball milling tank, which can not only ensure the ball milling effect, but also shorten the ball milling time and reduce the ball milling cost. The activation performance of the alloy can be improved by the effect of excessive titanium metal, which effectively reduces the activation conditions and shortens the activation cycle.

[0035] 2. The present invention provides a method for preparing a hydrogen storage material. A mixed solution is prepared by tetrapropoxysilane, propanol and water, and mixed with hydrogen storage particles to form a mixed solution. The prepared hydrogen storage material can have better bonding strength, effectively reduce the probability of pulverization of the hydrogen storage material, and increase the service life of the hydrogen storage material.

[0036] 3. The present invention provides a method for preparing hydrogen storage materials. Through the cooperation among a third motor, a rotating shaft, a rotating box, a bevel gear, a bevel gear ring, a connecting sleeve, a rotating column, and a stirring blade, the third motor can drive the rotating shaft to rotate, so that the rotating box can drive the rotating column and the stirring blade to rotate around the rotating shaft, so that the grinding balls and the materials can be stirred. At the same time, through the meshing between the bevel gear and the bevel gear ring, the rotating column and the stirring blade can rotate on themselves, and the grinding balls and the materials can be turned over, so that the ball milling effect of the grinding balls on the materials is better, which facilitates the ball milling of the hydrogen storage materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a flow chart of the preparation process of the present invention;

[0038] Figure 2 It is a structural schematic diagram of the ball mill of the present invention;

[0039] Figure 3 It is a schematic diagram of the cross-sectional structure of the ball mill stirring mechanism of the present invention;

[0040] Figure 4 It is a schematic cross-sectional structure diagram of the fixing mechanism of the present invention.

[0041] In the figure: 1. supporting bottom plate; 2. ball mill; 3. ventilation device; 4. supporting column; 5. first motor; 6. transmission screw; 7. sliding cover plate; 71. threaded hole; 72. fixing mechanism; 721. second motor; 722. threaded column; 723. sliding clamp; 724. guide column; 725. rubber pad; 8. ball mill stirring mechanism; 81. third motor; 82. rotating shaft; 83. rotating box; 84. bevel gear; 85. bevel gear ring; 86. connecting sleeve; 87. rotating column; 88. stirring blade. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below in conjunction with embodiments:

[0043] Example 1

[0044] like Figure 1 As shown, the present invention provides a method for preparing a hydrogen storage material, and the method for preparing a hydrogen storage material comprises the following steps:

[0045] Step 1: Preparation of raw materials;

[0046] Step 2: Preparation of alloy castings;

[0047] Step 3: Preparation of hydrogen storage particles;

[0048] Step 4: preparation of mixed solution;

[0049] Step 5: Mixing of hydrogen storage materials.

[0050] In the preparation of raw materials, it is necessary to prepare hydrogen storage metal raw materials, mixed solution raw materials, ammonia borane NH3BH3 and α-lithium nitride α-L i3N. The hydrogen storage metal raw materials include titanium powder, iron powder, manganese powder, cobalt powder, zirconium powder, nickel powder, copper powder, activated carbon, with a total mass of 200g and a particle size of 200 mesh. The mixed solution raw materials include tetrapropoxysilane, propanol and water.

[0051] Step 2 also includes the following steps:

[0052] A1: Prepare the hydrogen storage metal raw materials;

[0053] A2: Put the prepared raw material graphite crucible into the solid phase reaction furnace, heat it to 1600℃ under vacuum conditions, take it out after reacting for 5 hours, pour the liquid alloy into the copper casting mold to obtain the master alloy ingot;

[0054] A3: The master alloy ingot is crushed and screened.

[0055] Step three also includes the following steps:

[0056] B1: Put the sieved alloy powder into a ball mill, add the ball milling medium, the ball-to-material ratio is 1:15-25, and the ball milling medium uses stainless steel grinding balls with a particle size of 5mm;

[0057] B2: Use a vacuum pump to remove the air in the tank, fill it with 0.6-0.8MPa argon gas for gas protection, and repeat the filling and discharging of gas, each time for 3 minutes;

[0058] B3: Fix the ball mill jar on the ball mill, adjust the parameters such as the speed and time of the ball mill, take 1 hour as one operation cycle, run for 55 minutes in each cycle and stop for 5 minutes to prevent the temperature in the container from being too high;

[0059] B4: After ball milling, sieve out the alloy powder in the ball mill.

[0060] Step 4 also includes the following steps:

[0061] C1: tetrapropoxysilane and propanol are mixed in a ratio of 1:2 at a speed of 90-100 r / min to prepare a mixed solution 1;

[0062] C2: Propanol and water are stirred and mixed at a mixing ratio of 1:0.4 at a speed of 130-150 r / min to obtain a mixed solution 2;

[0063] C3: Finally, the mixed solution 1 and the mixed solution 2 are stirred at a mixing ratio of 1:2 at a speed of 70-90 r / min to obtain a mixed solution; wherein the temperature during the mixing and stirring is controlled within the range of 50-85°C.

[0064] Step five also includes the following steps:

[0065] D1: Add the hydrogen storage particles prepared in step 3 to the mixed solution prepared in step 4 and mix and stir them thoroughly. In this step, add appropriate amounts of ammonia borane NH3BH3 and α-lithium nitride α-Li 3N to the mixed solution to ensure that ammonia borane and α-lithium nitride are evenly distributed in the mixed solution and the hydrogen storage particles. During stirring, the temperature is controlled at 80-110°C, the mixing and stirring speed is 60-70r / min, and the stirring time is controlled at 40-60min;

[0066] D2: The mixed material is then poured into a molding mold for aging treatment at 25-40°C for 14-16 days to stabilize the material structure and further improve the hydrogen storage capacity.

[0067] In this embodiment, by combining the smelting method with the mechanical alloying method, the raw materials can be initially fused by melting before ball milling, so that the fusion effect of the hydrogen storage alloy can be better during ball milling. At the same time, during ball milling, the ball mill tank is repeatedly filled and discharged with gas, which can not only ensure the ball milling effect, but also shorten the ball milling time and reduce the ball milling cost. The activation performance of the alloy can be improved by the excess titanium metal, which effectively reduces the activation conditions and shortens the activation cycle. At the same time, a mixed solution prepared by tetrapropoxysilane, propanol and water and mixed with hydrogen storage particles can make the prepared hydrogen storage material have better bonding strength, effectively reduce the probability of pulverization of the hydrogen storage material, and increase the service life of the hydrogen storage material. At the same time, ammonia borane and α-lithium nitride, as hydrogen storage compounds, can form a composite hydrogen storage material with hydrogen storage metal particles, thereby improving the overall hydrogen storage capacity and hydrogen storage efficiency.

[0068] Example 2

[0069] like Figure 2 As shown, on the basis of Example 1, the present invention provides a technical solution: preferably, the ball mill includes a supporting base plate 1, a ball milling jar 2 is arranged on the top of the supporting base plate 1, a ventilation device 3 is arranged on the outer surface front side of the ball milling jar 2, support columns 4 are fixedly connected to the left and right sides of the supporting base plate 1, a first motor 5 is fixedly connected to the top of the support column 4, a transmission screw 6 is fixedly connected to the output shaft of the first motor 5, a sliding groove 1 is provided on the opposite surfaces of the two supporting columns 4, the bottom end of the transmission screw 6 penetrates into the interior of the sliding groove 1, a sliding cover plate 7 is slidably connected to the inner surface of the two sliding grooves 1, threaded holes 71 penetrating from top to bottom are provided on the left and right sides of the sliding cover plate 7, the inner surface of the threaded hole 71 is threadedly connected to the outer surface of the transmission screw 6, fixing mechanisms 72 are arranged on the left and right sides of the bottom of the sliding cover plate 7, and a ball mill stirring mechanism 8 is fixedly connected to the top of the sliding cover plate 7.

[0070] In this embodiment, when the hydrogen storage raw material is ball-milled, the alloy powder and grinding balls are placed in the ball mill 2, and the ball mill 2 is placed on the supporting base plate 1. By starting the first motor 5, the transmission screw 6 can be driven to rotate, so that the sliding cover plate 7 can slide downward through the threaded cooperation with the threaded hole 71, and the ball mill 2 can be closed and sealed. Afterwards, the gas can be filled and discharged into the interior of the ball mill 2 through the ventilation device 3, and the alloy powder and grinding balls inside can be stirred through the ball mill stirring mechanism 8, which can improve the ball milling effect of the alloy powder.

[0071] Example 3

[0072] like Figure 3As shown, on the basis of Example 2, the present invention provides a technical solution: preferably, the ball mill stirring mechanism 8 includes a third motor 81, the third motor 81 is fixedly connected to the top of the sliding cover plate 7, the output shaft of the third motor 81 passes through the bottom of the sliding cover plate 7 and is fixedly connected to a rotating shaft 82, the bottom end of the rotating shaft 82 is fixedly connected to a rotating box 83, the left and right sides of the interior of the rotating box 83 are movably connected with bevel gears 84, a bevel gear ring 85 is meshed and connected above the outer surfaces of the two bevel gears 84, the top of the bevel gear ring 85 is fixedly connected with a connecting sleeve 86, the connecting sleeve 86 is arranged on the outer surface of the rotating shaft 82 and the top end is fixedly connected to the bottom of the sliding cover plate 7, the side of the bevel gear 84 away from the bevel gear ring 85 is fixedly connected with a rotating column 87, the end of the rotating column 87 away from the bevel gear 84 passes through the outside of the rotating box 83 and the outer surface has four stirring blades 88 in a circular array.

[0073] In this embodiment, when the alloy powder and the grinding balls are stirred, the third motor 81 is started to drive the rotating shaft 82 to rotate, thereby enabling the rotating box 83 to rotate, and driving the rotating column 87 and the stirring blade 88 to rotate around the rotating shaft 82, so that the grinding balls and the alloy powder are stirred. At the same time, through the engagement between the bevel gear 84 and the bevel gear ring 85, the bevel gear 84 can drive the rotating column 87 to rotate, and the stirring blade 88 to rotate, so that the grinding balls and the materials can be flipped, so that the ball milling effect of the grinding balls on the materials is better, which facilitates the ball milling of the hydrogen storage materials.

[0074] Example 4

[0075] like Figure 4 As shown, on the basis of Example 2, the present invention provides a technical solution: preferably, the fixing mechanism 72 includes a second motor 721, and sliding grooves 2 are provided on both left and right sides of the bottom of the sliding cover plate 7. The second motor 721 is fixedly connected to the inner surface of the sliding groove 2 close to the side of the ball mill 2, and the output shaft of the second motor 721 is fixedly connected to a threaded column 722, and the outer surface of the threaded column 722 is threadedly connected to a sliding splint 723, and the front and rear sides of the sliding splint 723 are slidably connected to guide columns 724 that penetrate left and right, and the guide columns 724 are fixedly connected to the inside of the sliding groove 2, and the bottom of the sliding splint 723 is fixedly connected to a rubber pad 725 on the side close to the ball mill 2.

[0076] In this embodiment, when the ball mill 2 is closed by the sliding cover 7, the second motor 721 is started to drive the threaded column 722 to rotate, so that the sliding clamp 723 can slide along the guide column 724, and the ball mill 2 can be clamped and fixed by the rubber pad 725, so that the ball mill is more stable when in use.

[0077] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A method for preparing a hydrogen storage material, characterized in that: The preparation method of the hydrogen storage material comprises the following steps: Step 1: Preparation of raw materials; Step 2: Preparation of alloy castings; Step 3: Preparation of hydrogen storage particles; Step 4: preparation of mixed solution; Step 5: Mixing of hydrogen storage materials.

2. The method for preparing a hydrogen storage material according to claim 1, characterized in that: The preparation of the raw materials requires hydrogen storage metal raw materials, mixed solution raw materials, ammonia borane NH3BH3 and α-lithium nitride α-Li 3N. The hydrogen storage metal raw materials include titanium powder, iron powder, manganese powder, cobalt powder, zirconium powder, nickel powder, copper powder, activated carbon, with a total mass of 200g and a particle size of 200 mesh. The mixed solution raw materials include tetrapropoxysilane, propanol and water.

3. The method for preparing a hydrogen storage material according to claim 1, characterized in that: The step 2 also includes the following steps: A1: Prepare the hydrogen storage metal raw materials; A2: Put the prepared raw material graphite crucible into the solid phase reaction furnace, heat it to 1600℃ under vacuum conditions, take it out after reacting for 5 hours, pour the liquid alloy into the copper casting mold to obtain the master alloy ingot; A3: The master alloy ingot is crushed and screened.

4. The method for preparing a hydrogen storage material according to claim 1, characterized in that: The step three also includes the following steps: B1: Put the sieved alloy powder into a ball mill, add the ball milling medium, the ball-to-material ratio is 1:15-25, and the ball milling medium uses stainless steel grinding balls with a particle size of 5mm; B2: Use a vacuum pump to remove the air in the tank, fill it with 0.6-0.8MPa argon gas for gas protection, and repeat the filling and discharging of gas, each time for 3 minutes; B3: Fix the ball mill jar on the ball mill, adjust the parameters such as the speed and time of the ball mill, take 1 hour as one operation cycle, run for 55 minutes in each cycle and stop for 5 minutes to prevent the temperature in the container from being too high; B4: After ball milling, sieve out the alloy powder in the ball mill.

5. The method for preparing a hydrogen storage material according to claim 1, characterized in that: The step 4 also includes the following steps: C1: tetrapropoxysilane and propanol are mixed in a ratio of 1:2 at a speed of 90-100 r / min to prepare a mixed solution 1; C2: Propanol and water are stirred and mixed at a mixing ratio of 1:0.4 at a speed of 130-150 r / min to obtain a mixed solution 2; C3: Finally, the mixed solution 1 and the mixed solution 2 are stirred at a mixing ratio of 1:2 at a speed of 70-90 r / min to obtain a mixed solution; wherein the temperature during the mixing and stirring is controlled within the range of 50-85°C.

6. The method for preparing a hydrogen storage material according to claim 1, characterized in that: The step five also includes the following steps: D1: Add the hydrogen storage particles prepared in step 3 to the mixed solution prepared in step 4 and mix and stir them thoroughly. In this step, add appropriate amounts of ammonia borane NH3BH3 and α-lithium nitride α-Li 3N to the mixed solution to ensure that ammonia borane and α-lithium nitride are evenly distributed in the mixed solution and the hydrogen storage particles. During stirring, the temperature is controlled at 80-110°C, the mixing and stirring speed is 60-70r / min, and the stirring time is controlled at 40-60min; D2: The mixed material is then poured into a molding mold for aging treatment at 25-40°C for 14-16 days to stabilize the material structure and further improve the hydrogen storage capacity.

7. A method for preparing a hydrogen storage material according to claim 4, characterized in that: The ball mill comprises a support base plate (1), a ball milling jar (2) is arranged on the top of the support base plate (1), a ventilation device (3) is arranged on the outer front side of the ball milling jar (2), support columns (4) are fixedly connected to the left and right sides of the support base plate (1), a first motor (5) is fixedly connected to the top of the support column (4), a transmission screw (6) is fixedly connected to the output shaft of the first motor (5), a sliding groove (1) is provided on the opposite surfaces of the two support columns (4), the bottom end of the transmission screw (6) penetrates into the inside of the sliding groove (1), a sliding cover plate (7) is slidably connected to the inner surface of the two sliding grooves (1), threaded holes (71) that penetrate up and down are provided on the left and right sides of the sliding cover plate (7), the inner surface of the threaded hole (71) is threadedly connected to the outer surface of the transmission screw (6), fixing mechanisms (72) are arranged on the left and right sides of the bottom of the sliding cover plate (7), and a ball mill stirring mechanism (8) is fixedly connected to the top of the sliding cover plate (7).

8. A method for preparing a hydrogen storage material according to claim 7, characterized in that: The ball mill stirring mechanism (8) comprises a third motor (81), the third motor (81) is fixedly connected to the top of the sliding cover plate (7), the output shaft of the third motor (81) passes through the bottom of the sliding cover plate (7) and is fixedly connected to a rotating shaft (82), the bottom end of the rotating shaft (82) is fixedly connected to a rotating box (83), the left and right sides of the rotating box (83) are movably connected to bevel gears (84), and the outer surfaces of the two bevel gears (84) are meshed and connected to a A bevel gear ring (85) is provided, the top of the bevel gear ring (85) is fixedly connected to a connecting sleeve (86), the connecting sleeve (86) is arranged on the outer surface of the rotating shaft (82) and the top end is fixedly connected to the bottom of the sliding cover plate (7), the side of the bevel gear (84) away from the bevel gear ring (85) is fixedly connected to a rotating column (87), the end of the rotating column (87) away from the bevel gear (84) passes through the outside of the rotating box (83) and the outer surface thereof is provided with four stirring blades (88) in a circular array.

9. The method for preparing a hydrogen storage material according to claim 7, characterized in that: The fixing mechanism (72) comprises a second motor (721), and a second sliding groove is provided on both left and right sides of the bottom of the sliding cover plate (7). The second motor (721) is fixedly connected to the inner surface of the second sliding groove close to the side of the ball mill (2). The output shaft of the second motor (721) is fixedly connected to a threaded column (722), and the outer surface of the threaded column (722) is threadedly connected to a sliding clamp (723). The front and rear sides of the sliding clamp (723) are both slidably connected to guide columns (724) that penetrate left and right. The guide columns (724) are fixedly connected to the inside of the second sliding groove. The bottom of the sliding clamp (723) close to the side of the ball mill (2) is fixedly connected to a rubber pad (725).

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