An aluminum-based hydride compression molding apparatus and method

Abstract

The application discloses an aluminum-based hydride compression molding device and method. The device comprises a lower mold unit, an upper mold unit, a gas replacement unit and an electrostatic discharge unit. The lower mold unit comprises a shell and a lower mold base. The shell has a lower mold cavity with a top opening. The lower mold cavity forms a molding space above and a demolding space below. The diameter of the molding space is smaller than that of the demolding space. The lower mold base is arranged in the lower mold cavity and can move up and down so that the upper part of the lower mold base slides into the molding space or moves into the demolding space. The upper mold unit comprises an upper mold base. The application has the beneficial effects that: the inert gas is used to replace the air, effectively isolating the air. The electrostatic discharge unit discharges the electrostatic in the whole process, fundamentally avoiding the risk of combustion and explosion. The high-density compression molding of aluminum hydride powder can be realized, the volume hydrogen storage efficiency is greatly improved, and the integrity of the blank during the demolding process can be ensured.

Description

Technical Field

[0001] This invention relates to the field of solid hydrogen storage material molding technology, and in particular to an aluminum-based hydride pressing molding apparatus and method. Background Technology

[0002] Aluminum hydride (AlH3), as a high-performance solid hydrogen storage material, has the characteristics of high volumetric hydrogen storage density (149 g / L), high hydrogen release mass fraction (theoretical 10.1 wt%), and low hydrogen release temperature (100-200℃), which gives it significant advantages in the field of solid hydrogen storage, especially suitable for high energy density applications where hydrogen storage volume is strictly limited.

[0003] However, aluminum hydride is chemically reactive, and its structure contains Al³⁺. + and H - It is extremely unstable and readily undergoes violent redox reactions with moisture and oxygen in the air, posing a risk of combustion or explosion. Furthermore, aluminum hydride has high electrostatic sensitivity (10–100 mJ), making it prone to igniting and exploding hydrogen gas due to static electricity buildup.

[0004] Currently, aluminum hydride is mostly used in practical applications as a powder, with a packing density typically less than 40% of its theoretical density (1.486 g / cm³), severely limiting its high volumetric energy density advantage. To improve packing density, aluminum hydride powder needs to be pressed into shape. Existing technologies employ surface coating treatment during the pressing process to improve its air stability; however, the resulting protective film is prone to rupture during pressing due to compression and friction, exposing the highly reactive surface and posing a safety hazard. Furthermore, due to the high electrostatic insensitivity of aluminum hydride, static electricity accumulation during conventional pressing can easily lead to accidents.

[0005] Therefore, there is an urgent need to design an aluminum-based hydride pressing molding device and method to achieve high safety and high molding density pressing molding of aluminum hydride powder. Summary of the Invention

[0006] The purpose of this invention is to overcome the above-mentioned technical deficiencies and to propose an aluminum-based hydride pressing and molding apparatus and method, which solves the technical problems in the prior art where aluminum hydride powder is not only prone to reacting with oxygen or moisture to cause combustion and explosion, but also prone to accidents due to static electricity accumulation during the pressing and molding process.

[0007] To achieve the above-mentioned technical objectives, the present invention provides an aluminum-based hydride compression molding apparatus, comprising: The lower mold unit includes a housing and a lower mold base. The housing has a lower mold cavity with a top opening. The lower mold cavity forms a molding space located above and a demolding space located below. The diameter of the molding space is smaller than the diameter of the demolding space. The lower mold base is disposed in the lower mold cavity and can move up and down so that its upper part slides into the molding space or moves its upper part into the demolding space. The upper mold unit includes an upper mold base, which is used to seal and slide in the molding space; A gas replacement unit, connected to the lower mold cavity, is used to replace the air in the lower mold cavity with an inert gas or to inject inert gas into the lower mold cavity to push the upper mold base out of the lower mold cavity; and An electrostatic discharge unit is electrically connected to the housing to discharge static electricity.

[0008] Furthermore, the lower mold unit also includes a base, with the bottom opening of the lower mold cavity resting on the upper surface of the base and being detachably and fixedly connected to the base to seal the bottom opening via the base.

[0009] Furthermore, the lower mold unit also includes a pad block. The lower part of the lower mold base slides through the base and extends out of the housing. The pad block is disposed below the lower mold base to support the lower mold base, so that the upper part of the lower mold base can slide into the molding space. When the pad block is removed by hand, the upper part of the lower mold base can be moved into the demolding space.

[0010] Furthermore, the lower mold unit also includes multiple lower mandrels, each of which is vertically arranged and connected to the lower mold base. One of the lower mandrels is coaxial with the lower mold base, while the other lower mandrels are distributed in a ring array structure, and the circle formed by them is coaxial with the lower mold base, so that the pressed blank has a honeycomb-like structure. The upper mold base is sealed and slidably sleeved on each of the lower mandrels.

[0011] Furthermore, the lower mold base has multiple mounting holes extending vertically, and each lower mandrel slides through each mounting hole in a sealed manner. The pad is also used to support each lower mandrel. The upper mold base has multiple clearance holes extending vertically, and is fitted onto each lower mandrel in a sealed manner through each clearance hole.

[0012] Furthermore, the upper mold unit also includes multiple upper mandrels, each of which corresponds to and slides through each of the relief holes. Each of the upper mandrels can move downwards under pressure to press down each of the lower mandrels.

[0013] Furthermore, the lower part of the housing is provided with an air inlet and an exhaust outlet communicating with the demolding space. Both the air inlet and the exhaust outlet can be closed. The gas replacement unit includes a gas supply mechanism and a gas storage mechanism. The outlet end of the gas supply mechanism is connected to the air inlet to fill the lower mold cavity with inert gas. The inlet end of the gas storage mechanism is connected to the exhaust outlet to receive the gas replaced in the lower mold cavity.

[0014] Furthermore, the aluminum-based hydride pressing and molding apparatus further includes a first limiting unit, which is disposed on the side of the lower mold unit. The first limiting unit includes a limiting post and a limiting block. The limiting post is vertically arranged, and the limiting block rests on the top of the limiting post or moves away from the top of the limiting post. When the limiting block rests on the top of the limiting post, the top surface of the limiting block abuts against the lower pressure plate to limit the first pressing stroke of the lower pressure plate. When the limiting block moves away from the top of the limiting post, the top surface of the limiting post abuts against the lower pressure plate to limit the second pressing stroke of the lower pressure plate.

[0015] Furthermore, the aluminum-based hydride pressing and molding apparatus further includes a second limiting unit, which includes a limiting rod and a limiting plate. The bottom of the limiting rod is detachably and fixedly connected to the housing, and the limiting plate is fixedly connected to the top of the limiting rod. The bottom surface of the limiting plate is used to abut against the upper mold base to limit the upward travel of the upper mold base.

[0016] On the other hand, the present invention also provides an aluminum-based hydride compression molding method, applicable to the above-mentioned aluminum-based hydride compression molding apparatus, comprising the following steps: Step 1: Filling with powder: The upper part of the lower mold base slides into the molding space, and a preset weight of aluminum hydride powder is filled into the molding space above the lower mold base. The upper mold base is then sealed and slid into the molding space from the opening at the top of the lower mold cavity. Step 2, Air Replacement: The gas replacement unit replaces the air in the lower mold cavity with an inert gas; Step 3: Pressing the blank: Apply pressure to the upper mold base, and the upper mold base moves downward in the forming space to press the aluminum hydride powder into a blank; Step 4: Blank demolding: The upper part of the lower mold base moves into the demolding space, and pressure continues to be applied to the upper mold base. The upper mold base moves downward in the forming space to press the blank into the demolding space. Fifth step, ejecting the upper mold: The gas replacement unit injects inert gas into the lower mold cavity, the pressure in the upper mold cavity increases, pushing the upper mold base upward and ejecting the upper mold base from the lower mold cavity; Step 6: Remove the blank: Remove the blank from the demolding space on the lower mold base.

[0017] Compared with the prior art, the beneficial effects of the present invention include: In use, the upper part of the lower mold base is slidably moved into the molding space, then a preset weight of aluminum hydride powder is filled into the molding space above the lower mold base. The upper mold base is then sealed and slid into the molding space from the opening at the top of the lower mold cavity. The air in the lower mold cavity is then replaced with an inert gas by a gas replacement unit. Pressure is then applied to the upper mold base, causing it to move downwards within the molding space, pressing the aluminum hydride powder into a blank. The upper part of the lower mold base is then moved into the demolding space, and pressure continues to be applied to the upper mold base, causing it to press into a blank during molding. The blank moves downward within the space, pressing it into the demolding space. Then, inert gas is injected into the lower mold cavity through the gas replacement unit, increasing the pressure in the upper mold cavity and pushing the upper mold base upward, ejecting it from the lower mold cavity. Finally, the blank on the lower mold base is removed from the demolding space. The air is replaced by inert gas, effectively isolating it from the air. The entire process is completed by an electrostatic discharge unit, which discharges static electricity, fundamentally avoiding the risk of combustion and explosion. This process enables high-density molding of aluminum hydride powder, significantly improving the volumetric hydrogen storage efficiency, and ensuring the integrity of the blank during demolding. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of a pressed aluminum hydride billet; Figure 2 This is a schematic diagram of the structure of an aluminum-based hydride compression molding apparatus provided by the present invention; Figure 3 This is a three-dimensional structural diagram of an aluminum-based hydride pressing and molding apparatus provided by the present invention, omitting the gas replacement unit and the electrostatic discharge unit. Figure 4 This is a schematic diagram of the structure of the lower mold unit provided by the present invention; Figure 5 This is a cross-sectional view of the housing provided by the present invention; Figure 6 This is a three-dimensional structural diagram of the lower mold base provided by the present invention; Figure 7 This is a schematic diagram of the upper mold unit provided by the present invention; Figure 8 This is a schematic diagram of the connection relationship between the lower mold unit and the upper mold unit provided by the present invention; Figure 9 This is a schematic diagram of the structure of an aluminum-based hydride pressing and molding device provided by the present invention when pressing aluminum hydride powder; Figure 10 This is a schematic diagram of the structure of an aluminum-based hydride pressing and molding device provided by the present invention when the hydride aluminum billet is removed from the molding space; Figure 11 This is a schematic diagram of the structure of an aluminum-based hydride pressing and molding device provided by the present invention when the hydride aluminum billet is separated from the lower mandrel; Figure 12 This is a schematic diagram of the structure of an aluminum-based hydride pressing and molding apparatus provided by the present invention when the upper mold base is separated from the lower mold cavity; In the diagram: 1 - billet, 2 - lower pressure plate, 100 - lower mold unit, 110 - shell, 111 - lower mold cavity, 112 - air inlet, 113 - exhaust port, 114 - pressure relief port, 120 - lower mold base, 121 - exhaust guide groove, 122 - mounting hole, 130 - base, 131 - channel, 132 - slide groove, 140 - pad, 150 - lower mandrel, 200 - upper mold unit, 210 - upper mold base, 211 - clearance hole, 212 - receiving groove, 220 - upper mandrel, 230 - pressure block, 231 - extension hole, 300 - gas replacement unit, 310 - gas supply mechanism, 311 - gas cylinder, 3 12 - Inlet pipe, 313 - Pressure sensor, 320 - Gas storage mechanism, 321 - Gas storage cylinder, 322 - Outlet pipe, 323 - Sampling bag, 400 - Static electricity discharge unit, 410 - Grounding wire, 420 - Static electricity discharge component, 500 - Clamping unit, 510 - Guide rod, 520 - Mounting rod, 530 - Clamping component, 540 - Fastener, 600 - Positioning unit, 610 - Positioning rod, 620 - Blocking component, 700 - First limit unit, 710 - Limiting post, 720 - Limiting block, 800 - Second limit unit, 810 - Limiting rod, 820 - Limiting plate, 900 - Frame. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] This invention provides an aluminum-based hydride compression molding apparatus, the structure of which is as follows: Figure 2 - Figure 9As shown, the device includes a lower mold unit 100, an upper mold unit 200, a gas replacement unit 300, and an electrostatic discharge unit 400. The lower mold unit 100 includes a housing 110 and a lower mold base 120. The housing 110 has a lower mold cavity 111 with a top opening. The lower mold cavity 111 forms a molding space located above and a demolding space located below. The diameter of the molding space is smaller than the diameter of the demolding space. The lower mold base 120 is disposed in the lower mold cavity 111 and can move up and down so that its upper part slides. The upper mold unit 200 is moved into the molding space, or its upper part is moved into the demolding space; the upper mold unit 200 includes an upper mold base 210, which is used to seal and slide in the molding space; the gas replacement unit 300 is connected to the lower mold cavity 111 to replace the air in the lower mold cavity 111 with an inert gas or to inject an inert gas into the lower mold cavity 111 to push the upper mold base 210 out of the lower mold cavity 111; the static electricity discharge unit 400 is electrically connected to the housing 110 to discharge static electricity.

[0021] In use, the upper part of the lower mold base 120 is slid into the molding space, and then a preset weight of aluminum hydride powder is filled into the molding space above the lower mold base 120. The upper mold base 210 is then slid into the molding space from the opening at the top of the lower mold cavity 111. The air in the lower mold cavity 111 is then replaced with an inert gas by the gas replacement unit 300. Pressure is then applied to the upper mold base 210, causing it to move downwards within the molding space, pressing the aluminum hydride powder into a blank 1. The upper part of the lower mold base 120 is then moved into the demolding space, and pressure is continued to be applied to the upper mold base 210, causing it to move downwards within the molding space. The blank 1 is pressed into the demolding space by the moving part of the mold. Then, inert gas is injected into the lower mold cavity 111 through the gas replacement unit 300. The pressure in the upper mold cavity increases, pushing the upper mold base 210 upward and ejecting it from the lower mold cavity 111. Finally, the blank 1 on the lower mold base 120 is removed from the demolding space. The air is replaced by inert gas, effectively isolating the air. The static electricity is discharged through the static electricity discharge unit 400 throughout the process, fundamentally avoiding the risk of combustion and explosion. This method can achieve high forming density pressing of aluminum hydride powder, greatly improve the volume hydrogen storage efficiency, and ensure the integrity of the blank 1 during demolding.

[0022] As a preferred embodiment, please refer to Figure 6 and Figure 8 At least one exhaust guide groove 121 is provided on the side wall of the lower mold base 120. When the upper part of the lower mold base 120 slides into the molding space, the molding space and the demolding space can exchange gases through each exhaust guide groove 121. This ensures that the filling of aluminum hydride powder in the molding space above the lower mold base 120 is not affected, nor is the air replacement unit 300's air replacement in the molding space and demolding space affected.

[0023] As a preferred embodiment, please refer to Figure 3 and Figure 4 The lower mold cavity 111 has a bottom opening. The lower mold unit 100 also includes a base 130. The bottom opening of the lower mold cavity 111 rests on the upper surface of the base 130 and is detachably fixedly connected to the base 130 so as to seal the bottom opening through the base 130. During the process of removing the blank 1, the shell 110 is first removed from the base 130, and the blank 1 is exposed to the external environment. Then the blank 1 on the lower mold base 120 is removed from the lower mold base 120, making it easier to remove the blank 1.

[0024] As a preferred embodiment, please refer to Figure 3 and Figure 4 The lower mold unit 100 also includes a pad 140. The lower part of the lower mold base 120 is sealed and slides through the base 130 and extends out of the housing 110. The pad 140 is disposed below the lower mold base 120 to support the lower mold base 120, so that the upper part of the lower mold base 120 can slide into the molding space. The upper part of the lower mold base 120 can be moved into the demolding space by manually removing the pad 140. During the powder filling process, the pad 140 is placed below the lower mold base 120 to support the lower mold base. 120 allows the upper part of the lower mold base 120 to slide into the molding space, and then fills the molding space above the lower mold base 120 with a preset weight of aluminum hydride powder. Then, the upper mold base 210 is sealed and slid into the molding space from the opening at the top of the lower mold cavity 111. During the demolding process of the blank 1, the pad block 140 is removed by hand, the upper part of the lower mold base 120 moves into the demolding space, and pressure is continued to be applied to the upper mold base 210. The upper mold base 210 moves downward in the molding space, pressing the blank 1 into the demolding space.

[0025] As a preferred embodiment, please refer to Figure 3 and Figure 4 The base 130 has a channel 131 that communicates with the bottom of the lower mold cavity 111 and extends vertically. The lower part of the lower mold base 120 slides through the channel 131 and can move up and down along the channel 131. The channel 131 can guide the lower mold base 120 and allow the lower mold base 120 to pass through the channel 131 and extend out of the housing 110.

[0026] As a preferred embodiment, please refer to Figure 4 The lower mold base 120 is slidably connected to the channel 131. A first annular groove is provided on the arc-shaped wall. A first sealing ring is provided in the first annular groove to ensure that the lower part of the lower mold base 120 slides through the channel 131 in a sealed manner.

[0027] As a preferred embodiment, please refer to Figure 3 and Figure 4The base 130 has a groove 132 that communicates with the bottom of the channel 131 and extends horizontally. The pad 140 is slidably disposed in the groove 132 and can move horizontally back and forth along the length of the groove 132 to support the lower mold base 120 or separate from the lower mold base 120. The groove 132 can guide the movement of the pad 140, so that the pad 140 can reach the bottom of the lower mold base 120 or the side of the lower mold base 120, so as to realize the support of the pad 140 on the lower mold base 120 or the separation of the pad 140 from the lower mold base 120.

[0028] As a preferred embodiment, please refer to Figure 4 The upper mold base 210 is provided with a second annular groove on the arc-shaped wall that is slidably connected to the molding space. A second sealing ring is provided in the second annular groove to ensure that the upper mold base 210 is sealed and slidably inserted into the molding space from the opening at the top of the lower mold cavity 111.

[0029] As a preferred embodiment, please refer to Figure 4 A third annular groove is provided on the upper surface of the base 130 that abuts against the housing 110, and a third sealing ring is provided in the third annular groove to ensure the sealing of the connection between the base 130 and the housing 110.

[0030] As a preferred embodiment, please refer to Figure 4 The lower mold unit 100 also includes multiple lower mandrels 150, each of which is vertically arranged and connected to the lower mold base 120. One lower mandrel 150 is coaxial with the lower mold base 120, while the other lower mandrels 150 are distributed in a ring array structure, and the circle formed by their arrangement is coaxial with the lower mold base 120, so that the pressed blank 1 has a honeycomb-like structure. The upper mold base 210 is sealed and slidably sleeved on each lower mandrel 150. Since the pressed blank 1 in this application needs to be... The honeycomb-like structure is designed to meet practical application requirements. During the heating and decomposition process of the aluminum hydride billet 1, a filter is installed in the central hole of the billet 1 to handle exhaust. Heating tubes are installed in the evenly distributed holes of the billet 1 to heat the aluminum hydride billet 1 and decompose it. Multiple lower mandrels 150 are set, and the placement of each lower mandrel 150 is defined to ensure that the pressed billet 1 has a honeycomb-like structure, which meets the practical application requirements of the aluminum hydride billet 1.

[0031] As a preferred embodiment, please refer to Figure 4The lower mold base 120 has multiple vertically extending mounting holes 122, and each lower mandrel 150 slides through each mounting hole 122 in a sealed manner. The pad 140 is also used to support each lower mandrel 150. The upper mold base 210 has multiple vertically extending clearance holes 211, and is fitted onto each lower mandrel 150 in a sealed manner through each clearance hole 211. During the demolding process of the blank 1, the pad 140 is removed by hand, and the upper part of the lower mold base 120 moves into the demolding space, and each lower mandrel 150 slides through the clearance holes 211 in a sealed manner. The mandrel 150 moves downward and applies pressure to the upper mold base 210. The upper mold base 210 moves downward in the forming space and presses the blank 1 into the demolding space, thereby demolding the blank 1 from the cavity wall of the lower mold cavity 111. Then, pressure is applied to each lower mandrel 150, and each lower mandrel 150 continues to move downward. Since each lower mandrel 150 has a preset demolding angle on its contact surface with the blank 1, when each lower mandrel 150 undergoes a preset relative displacement relative to the blank 1, the blank 1 can be demolded from each lower mandrel 150.

[0032] As a preferred embodiment, please refer to Figure 4 The lower mandrel 150 is slidably connected to the mounting hole 122. A fourth annular groove is provided on the arc-shaped wall. A fourth sealing ring is provided in the fourth annular groove to ensure that the lower mandrel 150 slides through the mounting hole 122 in a sealed manner.

[0033] In a preferred embodiment, when each lower mandrel 150 undergoes a preset relative displacement relative to the blank 1, the blank 1 can be demolded from each lower mandrel 150. At this time, the uppermost fourth sealing ring of the lower mandrel 150 and the mounting hole 122 are still in a sealed state, ensuring that the lower mold cavity 111 is still in a sealed state.

[0034] As a preferred embodiment, please refer to Figure 7 and Figure 8 The upper mold unit 200 also includes multiple upper mandrels 220, each upper mandrel 220 corresponding to and slidingly passing through each clearance hole 211. Each upper mandrel 220 can move downward under pressure to press down on each lower mandrel 150. During the demolding process of the blank 1, the pad block 140 is removed by hand, the upper part of the lower mold base 120 moves into the demolding space, and each lower mandrel 150 moves downward, applying pressure to the upper mold base 210. The upper mold base 210 is in the forming space. The blank 1 is pressed downward into the demolding space, thereby demolding the blank 1 from the cavity wall of the lower mold cavity 111. Then, pressure is applied to each upper mandrel 220, and each upper mandrel 220 moves downward, pushing the corresponding lower mandrel 150 downward. Since each lower mandrel 150 has a preset demolding angle on its contact surface with the blank 1, when each lower mandrel 150 has a preset relative displacement relative to the blank 1, the blank 1 can be demolded from each lower mandrel 150.

[0035] As a preferred embodiment, please refer to Figure 7 The upper mandrel 220 and the relief hole 211 are connected by an arc-shaped wall with a fifth annular groove. A fifth sealing ring is provided in the fifth annular groove to ensure that the upper mandrel 220 slides through the relief hole 211 in a sealed manner.

[0036] As a preferred embodiment, please refer to Figure 7 - Figure 12 The upper mold unit 200 also includes a pressure block 230. The top of the upper mold base 210 has a receiving groove 212 with a top opening. The receiving groove 212 is connected to each clearance hole 211. The pressure block 230 is placed in the receiving groove 212. The pressure block 230 has multiple extension holes 231 with one end closed. When the opening of the other end of each extension hole 231 faces downward, the top surface of the pressure block 230 is flush with the top surface of the upper mold base 210. Each extension hole 231 is used for the upper end of each upper mandrel 220 to slide into it one by one. When the openings at the other ends of each extension hole 231 face upwards, since the upper ends of each upper mandrel 220 abut against the receiving groove 212, the top surface of the pressure block 230 is higher than the top surface of the upper mold base 210. The pressure block 230 is subjected to pressure to press down on each upper mandrel 220, so that each lower mandrel 150 moves downwards relative to the blank 1. Initially, the pressure block 230 is placed in the receiving groove 212, and the openings at the other ends of each extension hole 231 are kept facing downwards. The top surface of the pressure block 230 is flush with the top surface of the upper mold base 210. The blank 1 is demolded. During the process, the pad 140 is manually removed, the upper part of the lower mold base 120 is moved into the demolding space, each lower mandrel 150 moves downward, and the lower pressure plate 2 moves downward under the action of the hydraulic press, applying pressure to the upper mold base 210 and the pressure block 230. The upper mold base 210 moves downward in the forming space, pressing the blank 1 into the demolding space, realizing the demolding of the blank 1 from the cavity wall of the lower mold cavity 111. Then, the pressure block 230 is placed in reverse in the receiving groove 212, and the openings at the other ends of each extension hole 231 are kept facing upward. The upper end of the upper mandrel 220 abuts into the receiving groove 212. The top surface of the pressure block 230 is higher than the top surface of the upper mold base 210. The lower pressure plate 2 moves downward under the action of the hydraulic press, applying pressure to the pressure block 230. Each lower mandrel 150 moves downward and pushes each lower mandrel 150 to continue moving downward. Since each lower mandrel 150 has a preset demolding angle on the contact surface with the blank 1, when each lower mandrel 150 has a preset relative displacement relative to the blank 1, the blank 1 can be demolded from each lower mandrel 150.

[0037] As a preferred embodiment, please refer to Figure 2 and Figure 5The lower part of the housing 110 is provided with an air inlet 112 and an exhaust outlet 113 that communicate with the demolding space. Both the air inlet 112 and the exhaust outlet 113 can be closed. The gas replacement unit 300 includes a gas supply mechanism 310 and a gas storage mechanism 320. The outlet end of the gas supply mechanism 310 is connected to the air inlet 112 to fill the lower mold cavity 111 with inert gas. The inlet end of the gas storage mechanism 320 is connected to the exhaust outlet 113 to receive the gas replaced in the lower mold cavity 111. During the air replacement process, the air inlet 112 is opened and the exhaust outlet 113 is opened. The gas supply mechanism 310 fills the lower mold cavity 111 with inert gas. The gas in the lower mold cavity 111 enters the gas storage mechanism 320 through the exhaust outlet 113. Measuring the oxygen concentration in the gas storage mechanism 320 can determine whether the replacement meets the standard.

[0038] As a preferred embodiment, please refer to Figure 2 The gas supply mechanism 310 includes a gas cylinder 311, an air inlet pipe 312, a one-way air inlet valve, and a pressure sensor 313. One end of the air inlet pipe 312 is connected to the outlet end of the gas cylinder 311, and the inlet end of the one-way air inlet valve is connected to the other end of the air inlet pipe 312. The outlet end of the one-way air inlet valve is connected to the air inlet 112. The detection end of the pressure sensor 313 extends into the demolding space to detect the air pressure in the lower mold cavity 111. During the air replacement process, the one-way air inlet valve is opened, the exhaust port 113 is opened, and the pressure reducing valve of the gas cylinder 311 is opened to fill the lower mold cavity 111 with high-purity nitrogen to the set pressure (e.g., 0.4 MPa). After the pressure is maintained for 3-5 minutes, the oxygen concentration of the gas in the gas storage mechanism 320 is detected. The operation is repeated until the oxygen concentration of the gas in the gas storage mechanism 320 is lower than 0.5% (compliant with GB 4962-2008 standard) for three consecutive times. At this point, the gas replacement process is complete.

[0039] As a preferred embodiment, please refer to Figure 5 The lower part of the housing 110 is provided with a pressure relief port 114 that communicates with the demolding space. The air supply mechanism 310 also includes a rupture disc, which is sealed at the pressure relief port 114. When the pressure in the lower mold cavity 111 exceeds the preset value, the rupture disc can rupture to release the pressure in the lower mold cavity 111 and improve the safety of the device.

[0040] As a preferred embodiment, please refer to Figure 2The gas storage mechanism 320 includes a gas storage cylinder 321, a gas outlet pipe 322, a one-way gas outlet valve, and a sampling bag 323. One end of the gas outlet pipe 322 is connected to the exhaust port 113, and the other end of the gas outlet pipe 322 is connected to the inlet end of the gas storage cylinder 321. The inlet end of the one-way gas outlet valve is connected to the outlet end of the gas storage cylinder 321. The sampling bag 323 is used to connect to the outlet end of the one-way gas outlet valve. During the air replacement process, the one-way inlet valve is opened, the one-way outlet valve is closed, and the pressure reducing valve of the gas supply cylinder 311 is opened to fill the lower mold cavity 111 with high-purity nitrogen gas to a set pressure (e.g., 0.4). After the pressure reaches (MPa), close the one-way inlet valve and maintain the pressure for 3-5 minutes. Then, open the one-way outlet valve to release the gas from the gas storage cylinder 321 into the sampling bag 323. When the gas pressure in the gas storage cylinder 321 drops to zero, close the one-way outlet valve, remove the sampling bag 323, and use an oxygen concentration detector to test the oxygen concentration of the gas in the sampling bag 323. Repeat the operation until the oxygen concentration of the gas in the sampling bag 323 is below 0.5% for three consecutive times (complies with GB 4962-2008 standard). The gas replacement process is then complete.

[0041] As a preferred embodiment, please refer to Figure 2 The static electricity discharge unit 400 includes a grounding wire 410 and a static electricity discharge component 420. One end of the grounding wire 410 is electrically connected to the housing 110, and the other end of the grounding wire 410 is grounded. The static electricity discharge component 420 is electrically connected to the grounding wire 410 to conduct static electricity to the ground.

[0042] As a preferred embodiment, please refer to Figure 3 The aluminum-based hydride pressing and molding apparatus further includes multiple pressing units 500, each of which is located on the side of the lower mold unit 100 and is used to press or loosen the skirt at the bottom of the housing 110 so that the housing 110 is detachably and fixedly connected to the base 130. Thus, during the process of removing the blank 1, each pressing unit 500 can be operated to loosen the skirt at the bottom of the housing 110 and remove the housing 110 from the base 130, making it easier to remove the blank 1 from the lower mold base 120.

[0043] As a preferred embodiment, please refer to Figure 3The clamping unit 500 includes a guide rod 510, a mounting rod 520, a clamping member 530, and a fastener 540. The bottoms of the guide rod 510 and the mounting rod 520 are fixedly connected to a fixed object. One end of the clamping member 530 is slidably sleeved on the guide rod 510 and the mounting rod 520, and the other end of the clamping member 530 is used to clamp or loosen the skirt at the bottom of the housing 110. The fastener 540 is detachably and fixedly connected to the mounting rod 520 and the clamping member 530. One end of the clamping member 530 is slidably sleeved on the guide rod 510 and the mounting rod 520 until the other end of the clamping member 530 clamps the skirt at the bottom of the housing 110. Then, the mounting rod 520 and the clamping member 530 are detachably and fixedly connected through the fastener 540, so that the clamping member 530 clamps the housing 110.

[0044] As a preferred embodiment, please refer to Figure 3 The mounting rod 520 is a first screw. The clamping member 530 is slidably sleeved on the mounting rod 520 through the screw hole opened on it. The fastener 540 includes two first nuts, both of which are sleeved on the mounting rod 520 and screwed to the mounting rod 520. The two first nuts are located below and above the clamping member 530 respectively, so as to clamp the clamping member 530 together. The clamping member 530 can be loosened by rotating the upper first nut in the forward direction. After removing the upper first nut from the mounting rod 520, the clamping member 530 can be removed from the guide rod 510 and the mounting rod 520, which is convenient for disassembly and assembly.

[0045] In another embodiment, the guide rod 510 is a limiting screw. The T-shaped boss at the lower part of the mounting rod 520 is inserted into the dovetail groove of the fixing object. The upper part of the limiting screw is screwed to the clamping member 530, and the lower part abuts against the top surface of the fixing object. The T-shaped boss at the lower part of the mounting rod 520 is inserted into the dovetail groove of the fixing object, which serves to limit the vertical sliding of the mounting rod 520. The upper part of the limiting screw is screwed to the clamping member 530, and the lower part abuts against the top surface of the fixing object, which serves to adjust and limit the vertical height of the clamping member 530.

[0046] As a preferred embodiment, please refer to Figure 3The aluminum-based hydride pressing and molding apparatus further includes a positioning unit 600. The positioning unit 600 is detachably and fixedly connected to the housing 110 and the upper mold base 210 so that each upper mandrel 220 corresponds one-to-one with each lower mandrel 150. This ensures that each upper mandrel 220 can push each lower mandrel 150 downward during the downward movement. The positioning unit 600 has a guiding function and is used for alignment during the mold closing process of the upper mold base 210 and the lower mold base 120 to ensure that the upper mandrel 220 corresponds one-to-one with the lower mandrel 150. The positioning unit 600 can also limit the upper mold base 210 during the inert gas replacement process to prevent the upper mold base 210 from moving upward and getting out of the molding space under the pressure inside the lower mold cavity 111. After the inert gas replacement is completed, the gas in the lower mold cavity 111 needs to be released before the formal pressing, and then the positioning unit 600 can be removed.

[0047] As a preferred embodiment, please refer to Figure 3 The positioning unit 600 includes a positioning rod 610 and a blocking member 620. The lower end of the positioning rod 610 passes through the upper mold base 210 and is detachably and fixedly connected to the housing 110. The blocking member 620 is disposed above the upper mold base 210 and is detachably and fixedly connected to the upper end of the positioning rod 610.

[0048] As a preferred embodiment, please refer to Figure 3 The positioning rod 610 is the second screw, and the blocking part 620 is the second nut. The lower end of the positioning rod 610 passes through the through hole of the upper mold base 210 and is screwed into the screw hole of the housing 110. The second nut is sleeved on the positioning rod 610 and screwed to the positioning rod 610, which is convenient for disassembly and assembly.

[0049] As a preferred embodiment, please refer to Figure 9 - Figure 12The aluminum-based hydride pressing and molding apparatus further includes a first limiting unit 700, which is disposed on the side of the lower die unit 100. The first limiting unit 700 includes a limiting post 710 and a limiting block 720. The limiting post 710 is vertically arranged, and the limiting block 720 rests on or moves away from the top of the limiting post 710. When the limiting block 720 rests on the top of the limiting post 710, its top surface abuts against the lower pressure plate 2 to limit the first pressing stroke of the lower pressure plate 2. When the limiting block 720 moves away from the top of the limiting post 710, its top surface abuts against the lower pressure plate 2 to limit the second pressing stroke of the lower pressure plate 2. During the pressing of the blank 1, the limiting block 720 is placed on the top of the limiting post 710, and the lower pressure plate 2 is pressed under hydraulic pressure. The upper mold base 210 moves downward under the action of the machine, applying pressure to the upper mold base 210. The upper mold base 210 moves downward in the forming space until the lower pressure plate 2 abuts against the top surface of the limiting block 720. The lower pressure plate 2 stops moving downward, and the upper mold base 210 reaches the first pressing stroke, pressing the aluminum hydride powder into a blank 1. During the demolding process of the blank 1, the pad block 140 is removed by hand, and the upper part of the lower mold base 120 moves into the demolding space. The limiting block 720 is removed from the top of the limiting post 710. The lower pressure plate 2 moves downward under the action of the hydraulic press, continuing to apply pressure to the upper mold base 210. The upper mold base 210 moves downward in the forming space until the lower pressure plate 2 abuts against the top surface of the limiting post 710. The lower pressure plate 2 stops moving downward, and the upper mold base 210 reaches the second pressing stroke, pressing the blank 1 into the demolding space.

[0050] As a preferred embodiment, please refer to Figure 12 The aluminum-based hydride pressing and molding apparatus further includes a second limiting unit 800, which includes a limiting rod 810 and a limiting plate 820. The bottom of the limiting rod 810 is detachably and fixedly connected to the housing 110, and the limiting plate 820 is fixedly connected to the top of the limiting rod 810. The bottom surface of the limiting plate 820 is used to abut against the upper mold base 210 to limit the upward travel of the upper mold base 210. During the ejection of the upper mold, the limiting rod 810 is first... The bottom is detachably and fixedly connected to the housing 110, and the limiting plate 820 and the limiting rod 810 are detachably and fixedly connected. The gas replacement unit 300 injects inert gas into the lower mold cavity 111, the pressure in the upper mold cavity increases, and pushes the upper mold base 210 to move upward until the upper mold base 210 abuts against the bottom surface of the limiting plate 820. The gas replacement unit 300 stops injecting inert gas into the lower mold cavity 111 and pushes the upper mold base 210 out of the lower mold cavity 111.

[0051] In a preferred embodiment, the limiting rod 810 is a third screw. The bottom of the limiting rod 810 is screwed into the screw hole on the housing 110, so that the limiting rod 810 and the housing 110 can be detachably fixedly connected. Rotating the limiting rod 810 can adjust the height of the limiting plate 820, thereby adjusting the limiting stroke.

[0052] As a preferred embodiment, please refer to Figure 12 When the upper mold base 210 abuts against the bottom surface of the limiting plate 820, only the bottom edge of the upper mold base 210 is located inside the lower mold cavity 111, and the upper mold base 210 can be manually removed from the lower mold cavity 111.

[0053] As a preferred embodiment, please refer to Figure 3 The aluminum-based hydride pressing and molding apparatus further includes a frame 900, a base 130 fixedly connected to the frame 900, the bottoms of each guide rod 510 and each mounting rod 520 fixedly connected to the frame 900, and the bottom of the limiting post 710 fixedly connected to the frame 900. The frame 900 can provide support for the base 130, each guide rod 510, each mounting rod 520 and the limiting post 710.

[0054] In a preferred embodiment, when the guide rod 510 is a limiting screw, the T-shaped boss at the lower part of the mounting rod 520 is engaged in the dovetail groove of the frame 900, and the upper part of the limiting screw is screwed to the clamping member 530, while the lower part abuts against the top surface of the frame 900.

[0055] The present invention also provides a method for pressing aluminum-based hydrides, applicable to the above-mentioned aluminum-based hydride pressing apparatus, comprising the following steps: Powder filling: The pad 140 is placed below the lower mold base 120 to support the lower mold base 120 and each of the lower mold cores, so that the upper part of the lower mold base 120 slides into the molding space, and a preset weight of aluminum hydride powder is filled into the molding space above the lower mold base 120. The upper mold base 210 is sealed and slid into the molding space from the opening at the top of the lower mold cavity 111, and each of the upper mold cores corresponds to each of the lower mold cores. Air replacement: The housing 110 and the upper mold base 210 are detachably and fixedly connected via the positioning unit 600. Open the one-way inlet valve, close the one-way outlet valve, open the pressure reducing valve of the gas supply cylinder 311 to fill the lower mold cavity 111 with high-purity nitrogen to the set pressure, close the one-way inlet valve, maintain the pressure for a preset time, open the one-way outlet valve, and the gas in the gas storage cylinder 321 is discharged into the sampling bag 323. When the gas pressure in the gas storage cylinder 321 is reduced to zero, close the one-way outlet valve, remove the sampling bag 323, and use an oxygen concentration detector to test the oxygen concentration of the gas in the sampling bag 323. Repeat the operation until the oxygen concentration of the gas in the sampling bag 323 is lower than the set value three times in a row, and the gas replacement is completed. After all the gas in the lower mold cavity 111 is discharged, remove the positioning unit 600 so that the upper mold base 210 can move up and down relative to the housing 110. Pressing the blank: Place the limiting block 720 on top of the limiting post 710, place the pressing block 230 in the receiving groove 212, and keep the openings of the other ends of each extension hole 231 facing downwards. At this time, the top surface of the pressing block 230 is flush with the top surface of the upper mold base 210. The lower pressing plate 2 moves downward under the action of the hydraulic press, applying pressure to the upper mold base 210 and the pressing block 230. The upper mold base 210 moves downward in the forming space until the lower pressing plate 2 abuts against the top surface of the limiting block 720. The lower pressing plate 2 stops moving downward, and the upper mold base 210 reaches the first pressing stroke, pressing the aluminum hydride powder into the blank 1. Blank demolding: The pad block 140 is manually removed, the upper part of the lower mold base 120 is moved into the demolding space, each lower mandrel 150 moves downward, and the limiting block 720 is removed from the top of the limiting post 710. The lower pressure plate 2 moves downward under the action of the hydraulic press, continuing to apply pressure to the upper mold base 210. The upper mold base 210 moves downward in the forming space until the lower pressure plate 2 abuts against the top surface of the limiting post 710. The lower pressure plate 2 stops moving downward, and the upper mold base 210 reaches the second pressing stroke, pressing the blank 1 into the demolding space. Then, the pressure block 230 is placed in reverse in the receiving groove 212, and... Keep the openings at the other end of each extension hole 231 facing upwards. Since the upper ends of each upper mandrel 220 abut into the receiving groove 212, the top surface of the pressure block 230 is higher than the top surface of the upper mold base 210. The lower pressure plate 2 moves downwards under the action of the hydraulic press, applying pressure to the pressure block 230. Each lower mandrel 150 moves downwards and pushes each lower mandrel 150 downwards. Since each lower mandrel 150 has a preset demolding angle on the contact surface with the blank 1, when each lower mandrel 150 has a preset relative displacement relative to the blank 1, the blank 1 is demolded from each lower mandrel 150. Ejecting the upper mold: Open the one-way air inlet valve, close the one-way air outlet valve, open the pressure reducing valve of the air supply cylinder 311 to fill the lower mold cavity 111 with high-purity nitrogen gas, the pressure in the upper mold cavity increases, pushing the upper mold base 210 to move upward, and ejecting the upper mold base 210 from the lower mold cavity 111; Remove the blank: Operate each clamping unit 500, each clamping unit 500 loosens the skirt at the bottom of the housing 110, remove the housing 110 from the base 130, and then remove the blank 1 from the lower mold base 120.

[0056] To better understand this invention, the following is combined with... Figure 1 - Figure 12 The working principle of the technical solution of the present invention will be described in detail below: In use, the pad 140 is placed below the lower mold base 120 to support the lower mold base 120 and each of the lower mold cores, allowing the upper part of the lower mold base 120 to slide into the molding space. Then, a preset weight of aluminum hydride powder is filled into the molding space above the lower mold base 120. Next, the upper mold base 210 is sealed and slid into the molding space from the opening at the top of the lower mold cavity 111, ensuring that each of the upper mold cores corresponds one-to-one with each of the lower mold cores. The housing 110 and the upper mold base 210 are detachably and fixedly connected by the positioning unit 600. Then, the one-way inlet valve is opened, the one-way outlet valve is closed, and the pressure reducing valve of the gas supply cylinder 311 is opened to fill the lower mold cavity 111 with high-purity nitrogen to the set pressure. The one-way inlet valve is closed, and after maintaining the pressure for a preset time, the pressure reducing valve is opened. The gas in the gas storage cylinder 321 is discharged into the sampling bag 323 via a one-way vent valve. When the gas pressure in the gas storage cylinder 321 drops to zero, the one-way vent valve is closed, the sampling bag 323 is removed, and the oxygen concentration in the sampling bag 323 is tested with an oxygen concentration detector. This operation is repeated until the oxygen concentration in the sampling bag 323 is lower than the set value three times in a row, at which point the gas replacement is complete. After all the gas in the lower mold cavity 111 is discharged, the positioning unit 600 is removed, allowing the upper mold base 210 to move up and down relative to the housing 110. The limiting block 720 is placed on top of the limiting post 710, and the pressure block 230 is placed in the receiving groove 212, with the openings at the other ends of each extension hole 231 facing downwards. At this time, the top surface of the pressure block 230 is flush with the top surface of the upper mold base 210. The lower pressure plate 2 moves downward under the action of the hydraulic press, applying pressure to the upper mold base 210 and the pressure block 230. The upper mold base 210 moves downward in the forming space until the lower pressure plate 2 abuts against the top surface of the limiting block 720. The lower pressure plate 2 stops moving downward, and the upper mold base 210 reaches the first pressing stroke, pressing the aluminum hydride powder into a blank 1. The pad block 140 is removed manually, and the upper part of the lower mold base 120 moves into the demolding space. Each lower mandrel 150 moves downward, removing the limiting block 720 from the top of the limiting post 710. The lower pressure plate 2 moves downward under the action of the hydraulic press, continuing to apply pressure to the upper mold base 210. The upper mold base 210 moves downward in the forming space until the lower pressure plate 2 abuts against the top surface of the limiting post 710. The lower pressure plate 2 stops moving downward. When the mold base 210 reaches the second downward stroke, it presses the blank 1 into the demolding space. Then, the pressure block 230 is placed in reverse in the receiving groove 212, with the openings at the other ends of each extension hole 231 facing upwards. Since the upper ends of each upper mandrel 220 abut against the receiving groove 212, the top surface of the pressure block 230 is higher than the top surface of the upper mold base 210. The lower pressure plate 2 moves downward under the action of the hydraulic press, applying pressure to the pressure block 230. Each lower mandrel 150 moves downward, pushing each lower mandrel 150 downward. Since each lower mandrel 150 has a preset demolding angle on its contact surface with the blank 1, when each lower mandrel 150 has a preset relative displacement relative to the blank 1, the blank 1 is demolded from each lower mandrel 150. Then, the one-way air inlet valve is opened.Close the one-way gas outlet valve, open the pressure reducing valve of the gas supply cylinder 311 to fill the lower mold cavity 111 with high-purity nitrogen, the pressure in the upper mold cavity increases, pushing the upper mold base 210 upward, and ejecting the upper mold base 210 from the lower mold cavity 111. Finally, operate each clamping unit 500, each clamping unit 500 loosens the skirt at the bottom of the housing 110, removes the housing 110 from the base 130, and then removes the blank 1 from the lower mold base 120. This aluminum-based hydride pressing and molding device replaces air with inert gas, effectively isolating air. The entire process uses the electrostatic discharge unit 400 to discharge static electricity, fundamentally avoiding the risk of combustion and explosion. It can achieve high forming density pressing of aluminum hydride powder, greatly improve the volumetric hydrogen storage efficiency, and ensure the integrity of the blank 1 during demolding.

[0057] The aluminum-based hydride compression molding apparatus and method provided by this invention have the following beneficial effects: (1) The pressure sensor 313 and the rupture disc are integrated to realize real-time monitoring and abnormal pressure relief of the gas environment during the molding process, ensuring operational safety. The multi-layer O-ring seal and exhaust guide groove 121 design can maintain the airtightness of the cavity and facilitate gas replacement and exhaust. Through the step-by-step demolding and pneumatic assisted demolding design, the collision or friction that may be caused by traditional mechanical demolding is avoided, protecting the integrity of the blank 1 structure. (2) This device and method are not only applicable to aluminum hydride, but also to the high-safety compression molding of other powder materials that are sensitive to oxygen and easily ignited by static electricity; (3) This aluminum-based hydride pressing and molding device replaces air with inert gas, effectively isolating air. The static electricity is discharged through the static discharge unit 400 throughout the process, fundamentally avoiding the risk of combustion and explosion. It can achieve high forming density pressing of aluminum hydride powder, greatly improve the volume hydrogen storage efficiency, and ensure the integrity of the blank 1 during the demolding process.

[0058] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An aluminum-based hydride pressing and molding apparatus, characterized in that, include: The lower mold unit includes a housing and a lower mold base. The housing has a lower mold cavity with a top opening. The lower mold cavity forms a molding space located above and a demolding space located below. The diameter of the molding space is smaller than the diameter of the demolding space. The lower mold base is disposed in the lower mold cavity and can move up and down so that its upper part slides into the molding space or moves its upper part into the demolding space. The upper mold unit includes an upper mold base, which is used to seal and slide in the molding space; A gas replacement unit, connected to the lower mold cavity, is used to replace the air in the lower mold cavity with an inert gas or to inject an inert gas into the lower mold cavity to push the upper mold base out of the lower mold cavity; and An electrostatic discharge unit is electrically connected to the housing to discharge static electricity.

2. The aluminum-based hydride pressing and molding apparatus according to claim 1, characterized in that, The lower mold cavity has a bottom opening, and the lower mold unit also includes a base. The bottom opening of the lower mold cavity rests on the upper surface of the base and is detachably and fixedly connected to the base to seal the bottom opening via the base.

3. The aluminum-based hydride pressing and molding apparatus according to claim 2, characterized in that, The lower mold unit also includes a pad block. The lower part of the lower mold base slides through the base and extends out of the housing. The pad block is disposed below the lower mold base to support the lower mold base, so that the upper part of the lower mold base slides into the molding space. When the pad block is removed by hand, the upper part of the lower mold base can be moved into the demolding space.

4. The aluminum-based hydride pressing and molding apparatus according to claim 3, characterized in that, The lower mold unit also includes multiple lower mandrels, each of which is vertically arranged and connected to the lower mold base. One of the lower mandrels is coaxial with the lower mold base, while the other lower mandrels are distributed in a ring array structure, and the circle formed by them is coaxial with the lower mold base, so that the pressed blank has a honeycomb-like structure. The upper mold base is sealed and slidably sleeved on each of the lower mandrels.

5. The aluminum-based hydride pressing and molding apparatus according to claim 4, characterized in that, The lower mold base has multiple mounting holes extending vertically, and each lower mandrel slides through each mounting hole in a sealed manner. The pad is also used to support each lower mandrel. The upper mold base has multiple clearance holes extending vertically, and is fitted onto each lower mandrel in a sealed manner through each clearance hole.

6. The aluminum-based hydride pressing and molding apparatus according to claim 5, characterized in that, The upper mold unit also includes multiple upper mandrels, each of which corresponds to and slides through each of the relief holes. Each of the upper mandrels can move downwards under pressure to press down on each of the lower mandrels.

7. The aluminum-based hydride pressing and molding apparatus according to claim 1, characterized in that, The lower part of the housing is provided with an air inlet and an exhaust outlet that communicate with the demolding space. Both the air inlet and the exhaust outlet can be closed. The gas replacement unit includes a gas supply mechanism and a gas storage mechanism. The outlet end of the gas supply mechanism is connected to the air inlet to fill the lower mold cavity with inert gas. The inlet end of the gas storage mechanism is connected to the exhaust outlet to receive the gas replaced in the lower mold cavity.

8. The aluminum-based hydride pressing and molding apparatus according to claim 3, characterized in that, It also includes a first limiting unit, which is disposed on the side of the lower mold unit. The first limiting unit includes a limiting post and a limiting block. The limiting post is vertically arranged. The limiting block rests on the top of the limiting post or moves away from the top of the limiting post. When the limiting block rests on the top of the limiting post, the top surface of the limiting block abuts against the lower pressure plate to limit the first downward stroke of the lower pressure plate. When the limiting block moves away from the top of the limiting post, the top surface of the limiting post abuts against the lower pressure plate to limit the second downward stroke of the lower pressure plate.

9. The aluminum-based hydride pressing and molding apparatus according to claim 1, characterized in that, It also includes a second limiting unit, which includes a limiting rod and a limiting plate. The bottom of the limiting rod is detachably and fixedly connected to the housing, and the limiting plate is fixedly connected to the top of the limiting rod. The bottom surface of the limiting plate is used to abut against the upper mold base to limit the upward travel of the upper mold base.

10. A method for pressing aluminum-based hydrides, applicable to the aluminum-based hydride pressing apparatus as described in any one of claims 1-9, characterized in that, Includes the following steps: The upper part of the lower mold base slides into the molding space, and a preset weight of aluminum hydride powder is filled into the molding space above the lower mold base. The upper mold base is then sealed and slid into the molding space from the opening at the top of the lower mold cavity. The gas replacement unit replaces the air in the lower mold cavity with an inert gas; Pressure is applied to the upper mold base, which moves downward within the forming space to press aluminum hydride powder into a blank; The upper part of the lower mold base moves into the demolding space, and pressure continues to be applied to the upper mold base. The upper mold base moves downward in the forming space to press the blank into the demolding space. The gas replacement unit injects inert gas into the lower mold cavity, increasing the pressure in the upper mold cavity and pushing the upper mold base upward, thus ejecting the upper mold base from the lower mold cavity; The blank on the lower mold base is removed from the demolding space.

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