Macrocrystalline fused magnesite preparation device and preparation method thereof

Abstract

The invention relates to the technical field of refractory materials, and particularly discloses a macrocrystalline fused magnesite preparation device and a preparation method thereof.The macrocrystalline fused magnesite preparation device comprises a shell assembly, the shell assembly comprises a heat preservation shell, a trapezoidal groove is formed in the top of the heat preservation shell, a graphite crucible is placed in the heat preservation shell, and a crushing assembly is installed at the top of the shell assembly; a replaceable end cover and a rotating assembly are installed in the trapezoidal groove, a plurality of electrode assemblies are installed at the bottom of the rotating assembly and are installed in a central symmetry mode, a cam assembly and an air inlet spring are installed on the outer side of the rotating assembly, and the bottom of the outer side of the rotating assembly is connected with a transmission assembly in a meshed mode; according to the magnesium powder melting device, the electrode assembly and the cam assembly are arranged, the electrode assembly can be gradually lowered in the production process, magnesium powder at different positions can be melted through the device by means of synchronous operation of rotation and descending of the electrode assembly, meanwhile, the magnesium powder melting device adapts to height changes generated by magnesium powder melting, and the stable melting effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of refractory materials, and more particularly to a large-crystal fused magnesia preparation device and a preparation method thereof. Background Art

[0002] Fused magnesia is produced by melting in an electric arc furnace. It has the characteristics of high purity, large crystal grains, dense structure, strong slag resistance and good thermal shock stability. It is an excellent high-temperature electrical insulation material and an important raw material for making high-end magnesia bricks, magnesia-carbon bricks and monolithic refractory materials. Therefore, the preparation of fused magnesia is very important. Liaoning Province is the main production area of ​​fused magnesia. Currently, there are more than 800 fused magnesia furnaces of different capacities. In 2015, 1.47 million tons of high-quality fused magnesia were produced.

[0003] Chinese invention patent publication number CN114772952A discloses a large-crystal fused magnesia, as well as a method and apparatus for its preparation. The method comprises the following steps: preparing magnesite and performing a preliminary selection, optionally followed by pretreatment; pressing the resulting material into pellets; calcining the pellets at high temperature, and cooling and crystallizing them to produce large-crystal fused magnesia. This invention requires only a single calcination step, and eliminates the need for fillers or raw material transfer during the calcination process. This shortens calcination time, reduces energy consumption, and improves the quality of the large-crystal fused magnesia.

[0004] It can be seen that the current melting device usually adopts a fixed structure, that is, the magnesium oxide sand needs to be pre-treated by a pre-treatment device in the process before being placed in the crucible. The production process is relatively complicated and the structure is too cumbersome to adapt to the rapid production needs. At the same time, as the magnesium oxide particles continue to melt, the powder height decreases, which causes the arc distance to continue to increase and the melting effect to continue to decrease. In the subsequent electric melting process, the production efficiency will be significantly reduced, and the production method cannot be automatically adjusted according to the melting process. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a large-crystal fused magnesia preparation device and a preparation method thereof to solve the problems existing in the above-mentioned background technology.

[0006] The present invention provides the following technical solutions: a large-crystal fused magnesia preparation device and a preparation method thereof, comprising a shell assembly, the shell assembly comprising a heat-insulating shell, a trapezoidal groove being provided on the top of the heat-insulating shell, a graphite crucible being placed inside the heat-insulating shell, a crushing assembly being installed on the top of the shell assembly, a replaceable end cover and a rotating assembly being installed inside the trapezoidal groove, a plurality of electrode assemblies being installed on the bottom of the rotating assembly, the plurality of electrode assemblies being installed symmetrically about the center, a cam assembly and an air intake spring being installed on the outside of the rotating assembly, the bottom of the outside of the rotating assembly being meshed and connected with a transmission assembly, the transmission assembly being installed inside a gear groove and a motor groove, the cam assembly comprising a spherical rod and a push plate, the push plate being installed inside a push air cavity, the spherical rod and the cam block being at the same position, and with each rotation, the cam block pushes the cam assembly inward to increase a certain air pressure inside the vertical air cavity, thereby causing the electrode assembly to drop to a certain height; Furthermore, the crushing assembly includes a crushing table, the top of which is provided with a sedimentation placement groove, a grinding cone is installed in the middle of the crushing table, the grinding cone is installed in the middle position of the crushing table through a fixed frame at the bottom, and the grinding motor is installed at the bottom of the grinding cone. The shell assembly and the crushing assembly are fixedly connected by snap-fitting.

[0007] Furthermore, the rotating assembly includes a rotating body, which is composed of a support plate and a body. The support plate is installed at the position of the trapezoidal groove, and the trapezoidal groove supports it. The body is inside the thermal insulation shell, and a sliding circular groove and a large circular tooth groove are provided on the outside of the body. The position of the sliding circular groove is the same as that of the cam block, and the large circular tooth groove is meshed with the transmission gear of the transmission assembly. A feed circular port is provided inside the rotating body, and the position of the feed circular port is consistent with the middle position of the replaceable end cover. An air thrust cavity is provided on the inner side of the sliding circular groove, and an inlet pipe is provided on the side of the air thrust cavity. The bottom of the inlet pipe is connected to the vertical air cavity, and a cam assembly and an air intake spring are installed inside the air thrust cavity.

[0008] Furthermore, the inlet pipe consists of an inlet straight pipe and an outlet bent pipe, and a one-way valve is installed inside the inlet straight pipe and the outlet bent pipe. Each rotation allows the gas to enter the vertical air cavity from the straight pipe. An exhaust pipe is opened at the top of the vertical air cavity for exhausting the vertical air cavity at the end stage.

[0009] Furthermore, the cam block is an inclined arc plate, which pushes the spherical rod of the cam assembly to move inward when it contacts the spherical rod to cause the electrode assembly to descend.

[0010] Furthermore, the electrode assembly includes an electrode fixing rod, the top and bottom of the electrode fixing rod are respectively fixedly connected to a gas disc and a graphite electrode, the graphite electrode is used to generate a high-temperature arc, and a gas pressure spring is sleeved on the outer side of the gas disc, the gas pressure spring applies upward pressure to the gas disc, and the gas pressure spring and the gas disc are installed inside the vertical air cavity.

[0011] Furthermore, the replaceable end cover is a replaceable component. The guide end cover is used in the crushing stage, and the closed end cover is used in the melting stage. The middle of the guide end cover is a conical groove, and the top of the closed end cover is a complete plane.

[0012] Furthermore, the transmission assembly includes a transmission gear and a transmission motor, the transmission motor is connected to the grinding motor via an electrical signal, and the transmission gear is meshed with the large round tooth groove.

[0013] A method for preparing large-crystal fused magnesia comprises the following steps: S1: Place the rotating assembly and the guide end cover of the replaceable end cover inside the trapezoidal groove, install the crushing assembly by snapping it onto the top of the housing assembly, place large magnesium oxide particles on the top of the crushing assembly, and allow the magnesium oxide particles to enter the surface of the grinding cone under the action of gravity. The grinding motor drives the grinding cone to rotate, and the large magnesium oxide particles, after being ground, enter the interior of the graphite crucible through the conical surface of the grinding cone, the replaceable end cover, and the feeding round port; S2: Remove the crushing assembly, replace the sealing end cap of the replaceable end cap, seal the interior of the housing assembly, start the internal circuit, and the graphite electrode generates a high-temperature arc to melt the magnesium oxide particles; S3: Start the transmission motor of the transmission assembly. The transmission motor drives the rotating assembly to rotate through the gears. The rotation of the rotating assembly causes the spherical rod of the cam assembly to contact the cam block once per week. The cam block compresses the gas in the push air cavity inward, causing the gas to enter the interior of the vertical air cavity. The pressure at the top of the vertical air cavity increases, pushing the electrode assembly down a certain height. This ensures that the distance between the solid particles and the graphite electrode is fixed during melting, ensuring a stable melting effect. S4: After melting is completed, the gas inside the vertical air cavity is released to lift the position of the electrode assembly, making it easier to safely remove the electrode assembly.

[0014] The technical effects and advantages of the present invention are as follows: The present invention is provided with a crushing assembly and a replaceable end cover, which is beneficial to utilizing the detachable modular structure of the replaceable end cover and the crushing assembly to make the device multifunctional, can meet the pretreatment of magnesium oxide particles before melting, and does not affect the melting process after disassembly, reduces equipment dependence, and realizes a complete production process with a small number of mechanisms.

[0015] The present invention is facilitated by the gradual descent of the electrode assembly during the production process by providing the electrode assembly and the cam assembly. The synchronous rotation and descent of the electrode assembly enable the device to melt magnesium powder at different positions, while adapting to the height changes caused by the melting of the magnesium powder, thereby achieving a stable melting effect.

[0016] The present invention is provided with a rotating component, which is beneficial to utilizing the rotating effect of the furnace to process the magnesium oxide particles accumulated in the middle of the furnace, thereby maintaining a stable and efficient melting effect at each position. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a cross-sectional view of the overall structure of the present invention.

[0019] Figure 3 It is a schematic structural diagram of the housing assembly of the present invention.

[0020] Figure 4 The appended Figure 2 Schematic diagram of the structure of A in the figure.

[0021] Figure 5 It is a schematic diagram of the structure of the crushing component of the present invention.

[0022] Figure 6 It is a schematic structural diagram of the rotating assembly of the present invention.

[0023] Figure 7 Schematic diagram of the electrode assembly structure of the present invention.

[0024] The figures are marked as follows: 1. Shell assembly; 101. Insulation shell; 102. Trapezoidal groove; 103. Gear groove; 104. Motor groove; 105. Cam block; 2. Crushing assembly; 201. Crushing cone; 202. Sedimentation placement trough; 203. Fixed frame; 204. Grinding cone; 205. Grinding motor; 3. Transmission assembly; 4. Electrode assembly; 401. Electrode fixing rod; 402. Graphite electrode; 403. Gas circular plate; 404. Air pressure spring; 5. Cam assembly; 6. Graphite crucible; 7. Inlet spring; 8. Replaceable end cover; 9. Rotating assembly; 901. Rotating body; 902. Feed circular port; 903. Inlet tube; 904. Push air cavity; 905. Vertical air cavity; 906. Large round tooth groove; 907. Sliding circular groove. DETAILED DESCRIPTION

[0025] The technical solutions of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The large-crystal fused magnesia preparation device and preparation method thereof involved in the present invention are not limited to the various structures described in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work fall within the scope of protection of the present invention.

[0026] Reference Figure 1-3The present invention provides a large-crystal fused magnesia preparation device and a preparation method thereof, comprising a housing assembly 1, the housing assembly 1 comprising a heat-insulating housing 101, a trapezoidal groove 102 being formed on the top of the heat-insulating housing 101, a graphite crucible 6 being placed inside the heat-insulating housing 101, a crushing assembly 2 being mounted on the top of the housing assembly 1, a replaceable end cap 8 and a rotating assembly 9 being mounted inside the trapezoidal groove 102, a plurality of electrode assemblies 4 being mounted on the bottom of the rotating assembly 9, the plurality of electrode assemblies 4 being mounted symmetrically about the center, a cam assembly 5 and an air intake spring 7 being mounted on the outside of the rotating assembly 9, the bottom of the outside of the rotating assembly 9 being meshed with a transmission assembly 3, and the transmission assembly 3 being mounted inside a gear groove 103 and a motor groove 104; In this embodiment, it should be specifically explained that the cam block 105 is an inclined arc plate, which pushes the spherical rod of the cam assembly 5 to move inward when in contact with the spherical rod to cause the electrode assembly 4 to descend.

[0027] The main difference between this embodiment and the prior art is that the present embodiment utilizes the synchronous operation of the rotation and descent of the electrode assembly 4 to enable the device to melt magnesium powder at different positions, while adapting to the height changes caused by the melting of magnesium powder, so as to achieve a stable melting effect, specifically in the electrode assembly 4; The above structure is the main structure of this embodiment, which solves the problem that the current melting process cannot adapt to different positions and the melting degree of magnesium powder at different positions is different. At the same time, it solves the problem that the melting effect is reduced due to the change in the distance between the fixed position of the electrode and the liquid surface during the melting process. The motor is an existing structure, and the specific structure and connection method of the motor are not described in detail in this embodiment.

[0028] Reference Figure 4 The cam assembly 5 includes a spherical rod and a push plate. The push plate is installed inside the push air cavity 904. The spherical rod and the cam block 105 are in the same position. Every time it rotates one circle, the cam block 105 pushes the cam assembly 5 to move inward to increase the air pressure inside the vertical air cavity 905 to a certain extent, so that the electrode assembly 4 drops to a certain height.

[0029] In this embodiment, it should be specifically explained that an exhaust pipe is provided at the top of the vertical air cavity 905 for exhausting the vertical air cavity 905 at the end stage.

[0030] Reference Figure 5 The crushing assembly 2 includes a crushing table 201, a sedimentation placement groove 202 is provided on the top of the crushing table 201, a grinding cone 204 is installed in the middle of the crushing table 201, and the grinding cone 204 is installed in the middle position of the crushing table 201 through the fixing frame 203 at the bottom. The grinding motor 205 is installed at the bottom of the grinding cone 204, and the shell assembly 1 and the crushing assembly 2 are fixedly connected by snapping.

[0031] In this embodiment, it should be specifically explained that the magnesium oxide particles ground by the crushing assembly 2 enter the interior of the graphite crucible 6 through the conical surface of the grinding cone 204, the replaceable end cover 8 and the feed circular port 902, and accumulate in the middle of the graphite crucible 6. At this time, if the electrode assembly 4 still adopts a fixed installation method to generate a high-temperature arc, the magnesium oxide particles will diffuse to the surroundings when melting. The reduction in the height of the particles in the middle will inevitably lead to an increase in the distance and a reduction in the melting effect.

[0032] Reference Figure 6 The rotating assembly 9 includes a rotating body 901, which is composed of a support plate and a body. The support plate is installed at the position of the trapezoidal groove 102, and the trapezoidal groove 102 supports it. The body is inside the heat-insulating shell 101, and a sliding circular groove 907 and a large circular tooth groove 906 are provided on the outside of the body. The position of the sliding circular groove 907 is the same as that of the cam block 105. The large circular tooth groove 906 is meshed with the transmission gear of the transmission assembly 3. A feed circular port 902 is provided inside the rotating body 901, and the position of the feed circular port 902 is consistent with the middle position of the replaceable end cover 8. An air push cavity 904 is provided on the inner side of the sliding circular groove 907, and an inlet pipe 903 is provided on the side of the air push cavity 904. The bottom of the inlet pipe 903 is connected to the vertical air cavity 905, and the cam assembly 5 and the air intake spring 7 are installed inside the air push cavity 904.

[0033] In this embodiment, it should be specifically explained that the inlet pipe 903 consists of an inlet straight pipe and an outlet elbow, and a one-way valve is installed inside the inlet straight pipe and the outlet elbow. Each rotation allows the gas to enter the vertical air cavity 905 from the straight pipe.

[0034] Reference Figure 2 The replaceable end cover 8 is a replaceable component. The guide end cover is used in the crushing stage and the closed end cover is used in the melting stage. The middle part of the guide end cover is a conical groove, and the top of the closed end cover is a complete plane. When the guide end cover of the replaceable end cover 8 is placed inside the trapezoidal groove 102, the crushing assembly 2 installed on the top can grind large magnesium oxide particles. When the sealing end cover of the replaceable end cover 8 is replaced, the interior of the shell assembly 1 can be sealed to reduce heat dissipation.

[0035] In this embodiment, it should be specifically explained that: the transmission assembly 3 includes a transmission gear and a transmission motor, the transmission motor is connected to the grinding motor 205 via an electrical signal, and the transmission gear is meshed with the large round tooth groove 906.

[0036] The detachable modular structure of the replaceable end cover 8 and the crushing assembly 2 makes the device multifunctional, which can meet the pretreatment of magnesium oxide particles before melting without affecting the melting process after disassembly, reducing equipment dependence and realizing a complete production process with a small number of mechanisms.

[0037] Reference Figure 7 The electrode assembly 4 includes an electrode fixing rod 401, and the top and bottom of the electrode fixing rod 401 are respectively fixedly connected to a gas circular plate 403 and a graphite electrode 402. The graphite electrode 402 is used to generate a high-temperature arc. A gas pressure spring 404 is sleeved on the outer side of the gas circular plate 403. The gas pressure spring 404 applies upward pressure to the gas circular plate 403. The gas pressure spring 404 and the gas circular plate 403 are installed inside the vertical air cavity 905.

[0038] In this embodiment, it is necessary to specifically explain that: after the transmission motor of the transmission assembly 3 is started, the transmission motor drives the rotating assembly 9 to rotate through the gears. The rotation of the rotating assembly 9 causes the spherical rod of the cam assembly 5 to contact the cam block 105 every week, and at the same time causes the electrode assembly 4 to uniformly release high-temperature arcs to perform melting treatment everywhere.

[0039] The main problem solved by this embodiment is: the synchronous rotation and descent of the electrode assembly 4 allows the device to melt magnesium powder at different positions, while adapting to the height changes caused by the melting of the magnesium powder, so as to have a stable melting effect, solving the problem that the current melting process cannot adapt to different positions and the melting degree of magnesium powder at different positions is different. At the same time, it solves the problem that the fixed position of the electrode and the distance between the liquid surface change during the melting process, resulting in a reduction in the melting effect.

[0040] A method for preparing large-crystal fused magnesia, comprising the following steps: S1: The rotating assembly 9 and the guide end cover of the replaceable end cover 8 are placed inside the trapezoidal groove 102, and the crushing assembly 2 is installed by snapping it onto the top of the housing assembly 1. Large magnesium oxide particles are placed on the top of the crushing assembly 2. Under the action of gravity, the magnesium oxide particles enter the surface of the grinding cone 204. The grinding motor 205 drives the grinding cone 204 to rotate. After being ground, the large magnesium oxide particles pass through the conical surface of the grinding cone 204, the replaceable end cover 8, and the feeding circular port 902 into the interior of the graphite crucible 6; S2: Remove the crushing assembly 2, replace the sealing end cover of the replaceable end cover 8, seal the interior of the housing assembly 1, start the internal circuit, and the graphite electrode 402 generates a high-temperature arc to melt the magnesium oxide particles; S3: Start the transmission motor of the transmission assembly 3, which drives the rotating assembly 9 to rotate through the gears. The rotation of the rotating assembly 9 causes the spherical rod of the cam assembly 5 to contact the cam block 105 once per week. The cam block 105 compresses the gas in the push air cavity 904 inward, causing the gas to enter the interior of the vertical air cavity 905. The pressure at the top of the vertical air cavity 905 increases, pushing the electrode assembly 4 down a certain height, so that the distance between the solid particles and the graphite electrode 402 is fixed during melting, ensuring a stable melting effect. S4: After the melting is completed, the gas inside the vertical air cavity 905 is released to lift the position of the electrode assembly 4, so as to facilitate the safe removal of the electrode assembly 4.

[0041] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A large crystal fused magnesia preparation device, comprising a housing assembly (1), characterized in that: The housing assembly (1) includes a heat-insulating housing (101), a trapezoidal groove (102) is provided on the top of the heat-insulating housing (101), a graphite crucible (6) is placed inside the heat-insulating housing (101), a crushing assembly (2) is installed on the top of the housing assembly (1), a replaceable end cover (8) and a rotating assembly (9) are installed inside the trapezoidal groove (102), a plurality of electrode assemblies (4) are installed on the bottom of the rotating assembly (9), and the plurality of electrode assemblies (4) are installed symmetrically around the center, a cam assembly (5) and an air intake spring (7) are installed on the outside of the rotating assembly (9), the bottom of the outside of the rotating assembly (9) is meshed with the transmission assembly (3), and the transmission assembly (3) is installed inside the gear groove (103) and the motor groove (104); The cam assembly (5) comprises a spherical rod and a push plate, the push plate being mounted inside the push air cavity (904), the spherical rod being positioned at the same position as the cam block (105), and each time the cam block (105) rotates one circle, the cam assembly (5) is pushed inward to increase the air pressure inside the vertical air cavity (905) to a certain extent, thereby causing the electrode assembly (4) to descend to a certain height.

2. A large crystal fused magnesia preparation device according to claim 1, characterized in that: The crushing assembly (2) comprises a crushing table (201), a sedimentation placement groove (202) is provided on the top of the crushing table (201), a grinding cone (204) is installed in the middle of the crushing table (201), the grinding cone (204) is sleeved and installed in the middle of the crushing table (201) through a fixing frame (203) at the bottom, and a grinding motor (205) is installed at the bottom of the grinding cone (204). The housing assembly (1) and the crushing assembly (2) are fixedly connected by snapping.

3. A large crystal fused magnesia preparation device according to claim 2, characterized in that: The rotating assembly (9) includes a rotating body (901), which is composed of a support plate and a body. The support plate is installed at the position of the trapezoidal groove (102), and the trapezoidal groove (102) plays a supporting role for the body. The body is inside the heat-insulating shell (101), and a sliding circular groove (907) and a large round tooth groove (906) are provided on the outside of the body. The position of the sliding circular groove (907) is the same as that of the cam block (105), and the large round tooth groove (906) is aligned with the position of the transmission assembly (3). The transmission gears are meshed and connected, and a feed circular opening (902) is provided inside the rotating body (901), and the position of the feed circular opening (902) is consistent with the middle position of the replaceable end cover (8). An air pushing cavity (904) is provided on the inner side of the sliding circular groove (907), and an inlet pipe (903) is provided on the side of the air pushing cavity (904). The bottom of the inlet pipe (903) is connected to the vertical air cavity (905), and a cam assembly (5) and an air intake spring (7) are installed inside the air pushing cavity (904).

4. A large crystal fused magnesia preparation device according to claim 3, characterized in that: The inlet pipe (903) consists of an inlet straight pipe and an outlet elbow, and a one-way valve is installed inside the inlet straight pipe and the outlet elbow. Each rotation allows gas to enter the vertical air cavity (905) from the straight pipe. An exhaust pipe is opened at the top of the vertical air cavity (905) for exhausting the vertical air cavity (905) at the end stage.

5. A large crystal fused magnesia preparation device according to claim 4, characterized in that: The cam block (105) is an inclined arc plate, which pushes the spherical rod of the cam assembly (5) to move inward when in contact, causing the electrode assembly (4) to descend.

6. A large crystal fused magnesia preparation device according to claim 5, characterized in that: The electrode assembly (4) comprises an electrode fixing rod (401), the top and bottom of the electrode fixing rod (401) are respectively fixedly connected to a gas circular plate (403) and a graphite electrode (402), the graphite electrode (402) is used to generate a high-temperature arc, and a gas pressure spring (404) is sleeved on the outer side of the gas circular plate (403), the gas pressure spring (404) applies upward pressure to the gas circular plate (403), and the gas pressure spring (404) and the gas circular plate (403) are installed inside the vertical air cavity (905).

7. A large crystal fused magnesia preparation device according to claim 6, characterized in that: The replaceable end cap (8) is a replaceable component. The guide end cap is used in the crushing stage, and the closed end cap is used in the melting stage. The middle of the guide end cap is a conical groove, and the top of the closed end cap is a complete plane.

8. The large crystal fused magnesia preparation device according to claim 7, characterized in that: The transmission assembly (3) comprises a transmission gear and a transmission motor, the transmission motor is connected to the grinding motor (205) via an electrical signal, and the transmission gear is meshedly connected to the large round tooth groove (906).

9. A method for preparing large crystal fused magnesia, characterized in that: The method of preparing large crystal fused magnesia according to claim 8 comprises the following steps: S1: placing the rotating assembly (9) and the guide end cover of the replaceable end cover (8) inside the trapezoidal groove (102), installing the crushing assembly (2) by snapping it onto the top of the housing assembly (1), placing large magnesium oxide particles on the top of the crushing assembly (2), and allowing the magnesium oxide particles to enter the surface of the grinding cone (204) under the action of gravity. The grinding motor (205) drives the grinding cone (204) to rotate, and the large magnesium oxide particles are ground and then enter the interior of the graphite crucible (6) through the conical surface of the grinding cone (204), the replaceable end cover (8) and the feeding circular port (902); S2: removing the crushing assembly (2), replacing the sealing end cap of the replaceable end cap (8), sealing the interior of the housing assembly (1), starting the internal circuit, and causing the graphite electrode (402) to generate a high-temperature arc to melt the magnesium oxide particles; S3: Start the transmission motor of the transmission assembly (3), and the transmission motor drives the rotating assembly (9) to rotate through the gears. The rotation of the rotating assembly (9) causes the spherical rod of the cam assembly (5) to contact the cam block (105) once per week. The cam block (105) compresses the gas in the push air cavity (904) inward, causing the gas to enter the interior of the vertical air cavity (905). The pressure at the top of the vertical air cavity (905) increases, pushing the electrode assembly (4) down a certain height, so that the distance between the solid particles and the graphite electrode (402) is fixed during melting, thereby ensuring a stable melting effect. S4: After the melting is completed, the gas inside the vertical air cavity (905) is released to lift the position of the electrode assembly (4), thereby facilitating the safe removal of the electrode assembly (4).

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