Microwave smelting furnace

Abstract

The utility model relates to the technical field of microwave equipment, in particular to a microwave smelting furnace which comprises a furnace body, and one side of the furnace body is open and hinged to a furnace door capable of being opened and closed. A heat preservation box is arranged in the furnace body, a magnetron emitting microwaves into the furnace body is arranged on the furnace body, a corrugated pipe is connected to the top end of the furnace body in a sealed mode, and a stirring driving mechanism is arranged at the upper end of the corrugated pipe. The stirring driving mechanism is connected with a stirring shaft located in the corrugated pipe, and a stirring paddle is arranged at the lower end of the stirring shaft; the device further comprises a lifting driving mechanism which is connected with the corrugated pipe and used for driving the corrugated pipe to stretch out and draw back. The corrugated pipe is matched with the lifting driving mechanism, so that the vertical lifting control of the stirring paddle is realized, and the intervention opportunity of the stirring paddle can be flexibly adjusted according to the smelting stage; the sealing design of the corrugated pipe keeps the atmosphere stability in the furnace in the lifting process, and is suitable for smelting high-purity materials; the stirring position can be dynamically adjusted according to the depth of a molten pool, and upper and lower layer mixing uniformity of melt is improved.

Description

Technical Field

[0001] This utility model relates to the field of microwave equipment technology, specifically a microwave melting furnace. Background Technology

[0002] Traditional metal smelting methods, such as electric arc melting and induction melting, consume a large amount of energy during operation, resulting in material and energy waste and posing safety risks. To overcome the shortcomings of traditional smelting, advanced smelting technologies, such as electron beam melting, infrared melting, plasma melting, and microwave melting, have been continuously developed. Among these, microwave heating has attracted widespread attention due to its advantages such as fast heating speed, short processing time, low energy consumption, and minimal environmental impact.

[0003] Existing microwave melting furnaces, such as the high-temperature microwave silicon material melting furnace described in application number CN202320382293.9, include an outer furnace cover, an insulation layer fixedly installed inside the outer furnace cover, a feed pipe passing through the outer furnace cover and the insulation layer, a graphite crucible placed inside the insulation layer, a motor placed on the upper side of the insulation layer, a stirring rod connected to the motor via a coupling, the bottom of the stirring rod being inside the graphite crucible, and a magnetron placed on the insulation layer. In existing technologies, the stirring rod is fixed and cannot be moved, always immersed in the crucible, leading to the following problems: 1. When the lumpy material is not completely melted, the stirring resistance is high, the motor load is high, and unnecessary energy loss occurs; 2. Hard lumpy materials (such as silicon carbide and high borosilicate blocks) collide with the stirring rod, which may damage the graphite crucible or the stirring rod, reducing the equipment life; 3. It is impossible to achieve staged stirring optimization. Some materials (such as high-purity silicon and special alloys) need to be heated to a molten state before stirring to avoid component segregation or the introduction of impurities, but existing technologies cannot flexibly control the timing of stirring intervention, affecting the melting quality; 4. The stirring depth is fixed, and the stirring position cannot be adjusted according to the depth of the molten pool, which may lead to uneven mixing of the upper and lower layers of the melt (such as uneven doping or inconsistent alloy composition distribution during silicon melting). Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a microwave melting furnace that can realize the vertical lifting and lowering control of the stirring paddle, so as to flexibly adjust the timing of the stirring paddle intervention according to the melting stage.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A microwave melting furnace includes a furnace body with an open and hinged furnace door on one side; an insulation box inside the furnace body; a magnetron on the furnace body that emits microwaves into the furnace body; a corrugated pipe sealed to the top of the furnace body; a stirring drive mechanism at the upper end of the corrugated pipe; a stirring shaft connected to the stirring drive mechanism, the stirring shaft being located inside the corrugated pipe; a stirring paddle at the lower end of the stirring shaft; and a lifting drive mechanism connected to the corrugated pipe for driving the corrugated pipe to extend and retract.

[0007] Compared with the prior art, the outstanding features of this utility model, which adopts the above technical solution, are:

[0008] The vertical lifting and lowering control of the stirring paddle is achieved through the cooperation of the bellows and the lifting drive mechanism. The stirring paddle can be flexibly adjusted according to the melting stage (such as heating first and then stirring) to avoid damage to the stirring paddle or crucible by collisions with hard lumpy materials, thus extending the service life of the equipment. The sealing design of the bellows maintains the stability of the furnace atmosphere during the lifting process and avoids external contamination, which is especially suitable for the melting of high-purity materials. The stirring position can be dynamically adjusted according to the depth of the molten pool to improve the uniformity of mixing between the upper and lower layers of the melt (such as silicon doping or alloy composition distribution).

[0009] As a preferred embodiment, a further technical solution of this utility model is:

[0010] Preferably, the corrugated pipe includes an upper corrugated pipe and a lower corrugated pipe that are sealed together. A lifting drive mechanism is located at the top of the upper corrugated pipe, and the lower end of the lower corrugated pipe is sealed to the top of the furnace body. The lifting drive mechanism includes a primary adjustment mechanism and a secondary adjustment mechanism. The primary adjustment mechanism is connected to the lower corrugated pipe, and the secondary adjustment mechanism is connected to the upper corrugated pipe. A connecting frame is provided inside the lower corrugated pipe, and the bottom of the connecting frame is connected to the cover of the insulation box. The stirring shaft passes through the cover. The separate upper and lower corrugated pipes, together with the two-stage adjustment mechanism, realize the linkage lifting of the stirring shaft and the cover of the insulation box.

[0011] Preferably, both the primary and secondary adjustment mechanisms are electric sliding tables. The slider of the primary adjustment mechanism is provided with a first connecting seat, and the slider of the secondary adjustment mechanism is provided with a second connecting seat. The top of the furnace body is also provided with a first guide rod and a second guide rod. The first connecting seat is slidably sleeved on the first guide rod and connected and fixed to the lower corrugated pipe. The second connecting seat is slidably sleeved on the second guide rod and connected and fixed to the upper corrugated pipe. As an adjustment mechanism, the electric sliding table has high control precision and is easy to link with melting process parameters (such as temperature and time). The design of the first and second guide rods prevents the corrugated pipe from tilting when it expands and contracts, ensuring that the stirring shaft moves vertically and avoiding collision with the inner wall of the crucible.

[0012] Preferably, the stirring drive mechanism includes a stirring drive motor and a magnetic fluid seal. The magnetic fluid seal is sealed to the upper end of the bellows. The upper end of the rotating shaft of the magnetic fluid seal is connected to the output shaft of the stirring drive motor, and the lower end is connected to the stirring shaft. When the magnetic fluid seal is connected to the stirring drive motor, it plays a dynamic sealing role, which solves the microwave leakage problem caused by the easy wear of traditional mechanical seals. The external placement of the stirring drive motor reduces thermal interference in the furnace and improves the motor life.

[0013] Preferably, the furnace also includes a support frame on which an electric cylinder is mounted; a first through hole is provided on the side of the furnace body away from the furnace door, and a connecting sleeve is connected to the first through hole; the output shaft of the electric cylinder is slidably sealed to the connecting sleeve; a support seat is provided at the end of the output shaft of the electric cylinder, and the insulation box is mounted on the support seat. The electric cylinder drives the insulation box to move horizontally in and out, facilitating material loading and unloading; the sliding seal structure between the support seat and the connecting sleeve maintains the stability of the atmosphere inside the furnace, making it particularly suitable for smelting scenarios requiring vacuum or inert gas protection.

[0014] Preferably, the furnace body is provided with a second through hole, to which an atmosphere control pipe is connected. The atmosphere control pipe is provided with a vacuum connector and an air inlet connector. An air extraction valve is connected to the vacuum connector, and an air inlet valve is connected to the air inlet connector. The furnace body is provided with a third through hole, to which an exhaust pipe is connected. An exhaust valve is connected to the exhaust pipe. The vacuum connector, air inlet connector, and exhaust pipe are used in combination to achieve atmosphere control inside the furnace and meet the requirements of special alloy smelting.

[0015] Preferably, it also includes a quick-locking mechanism, which includes a connecting seat on the furnace body, a quick-locking shaft hinged to the connecting seat, a handwheel threaded onto the quick-locking shaft, and a pressing sleeve rotatably connected to the lower end of the handwheel via a bearing; a connecting handle is provided on the furnace cover corresponding to the quick-locking shaft, the connecting handle extends to the outside of the furnace cover, and a C-shaped clamp is provided at the end of the connecting handle located on the outside of the furnace cover, the C-shaped clamp being adapted to the quick-locking shaft; the quick-locking mechanism realizes the rapid opening and closing of the furnace door through the cooperation of the C-shaped clamp, the quick-locking shaft, and the pressing sleeve.

[0016] Preferably, the insulated box is assembled from a bottom plate and side panels; the modular design facilitates the replacement of damaged parts (such as partially ablated side panels), reducing maintenance costs; the modular design adapts to crucibles of different sizes, enhancing the equipment's versatility.

[0017] Preferably, a thermocouple is installed on the furnace body, and a temperature measuring hole is provided on the side panel of the insulation box. The thermocouple is inserted into the inside of the insulation box through the temperature measuring hole; the thermocouple directly monitors the internal temperature of the insulation box through the temperature measuring hole. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the microwave melting furnace in an embodiment of this utility model;

[0019] Figure 2 yes Figure 1 Enlarged structural diagram at point A;

[0020] Figure 3 This is a cross-sectional view of the microwave melting furnace on the other side in this embodiment of the present invention;

[0021] Figure 4 yes Figure 3 Enlarged structural diagram at point B;

[0022] Figure 5 This is a schematic diagram of the connection structure of the connecting handle in an embodiment of this utility model.

[0023] Explanation of reference numerals in the attached drawings: 1. Furnace body; 2. Furnace door; 3. Insulation box; 4. Bellows; 401. Lower bellows; 402. Upper bellows; 5. Magnetorheological fluid seal; 6. Stirring drive motor; 7. Stirring shaft; 8. Stirring paddle; 9. First guide rod; 10. Second guide rod; 11. Connecting frame; 12. Box cover; 13. Connecting seat; 14. Quick-lock shaft; 15. Handwheel; 16. C-type clamp; 17. Press-fit sleeve; 18. Thermocouple; 19. Electric cylinder; 20. Support seat; 21. Magnetron; 22. Vacuum connector; 23. Air inlet connector; 24. Third through hole; 25. First-level adjustment mechanism; 26. Second-level adjustment mechanism; 27. Mounting seat; 28. Camera; 29. ​​Transparent quartz plate; 30. Connecting handle; 31. Waveguide; 32. Quartz seal; 33. Excitation chamber. Detailed Implementation

[0024] The present invention will be further described below with reference to specific embodiments. The purpose of this description is only to better understand the content of the present invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0025] like Figures 1 to 5 As shown, this embodiment provides a microwave melting furnace, including a furnace body 1, with an open and hinged furnace door 2 on one side; an insulation box 3 is installed inside the furnace body 1; a magnetron 21 emitting microwaves into the furnace body 1 is installed on the side wall of the furnace body 1; specifically, a waveguide 31 is connected to the side wall of the furnace body 1, and an excitation cavity 33 is sealed to the outer end of the waveguide 31, with the magnetron 21 connected to the excitation cavity 33; the excitation cavity 33 is sealed to the outer end of the waveguide 31 through a connecting cover plate, and a quartz seal 32 is installed inside the connecting cover plate; a bellows is sealed to the top of the furnace body 1, and a stirring drive mechanism is installed at the upper end of the bellows; the stirring drive mechanism is connected to a stirring shaft 7, which is located in the bellows, and a stirring paddle 8 is installed at the lower end of the stirring shaft 7; a lifting drive mechanism is also included, which is connected to the bellows to drive the bellows to extend and retract.

[0026] In use, open furnace door 2, place the material to be melted in a container (such as a crucible) and put it into the heat preservation box 3, then close furnace door 2; the main controller controls magnetron 21 to heat the material to be melted. After the material is heated to a molten state, the lifting drive mechanism drives the bellows to descend, which in turn drives the stirring shaft 7 and stirring paddle 8 to descend and extend into the molten material. After descending to the preset height, the stirring drive mechanism drives the stirring shaft 7 and stirring paddle 8 to rotate, stirring the molten material; when it is necessary to make the upper and lower layers of the molten material evenly mixed, the stirring drive mechanism drives the stirring shaft 7 and stirring paddle 8 to rotate while the lifting drive mechanism drives the bellows to perform telescopic movement, so that the upper and lower layers of the molten material are evenly mixed.

[0027] like Figure 1 , Figure 3 As shown, the corrugated pipe includes an upper corrugated pipe 402 and a lower corrugated pipe 401 that are sealed together. A lifting drive mechanism is located at the top of the upper corrugated pipe 402, and the lower end of the lower corrugated pipe 401 is sealed to the top of the furnace body 1. The lifting drive mechanism includes a primary adjustment mechanism 25 and a secondary adjustment mechanism 26. The primary adjustment mechanism 25 is connected to the lower corrugated pipe 401, and the secondary adjustment mechanism 26 is connected to the upper corrugated pipe 402. A connecting frame 11 is provided inside the lower corrugated pipe 401, and the bottom of the connecting frame 11 is connected to the cover 12 of the insulation box 3. The stirring shaft 7 passes through the cover 12. Specifically, the upper corrugated pipe 402, the lower corrugated pipe 401, and the lower corrugated pipe 401 are bolted to the top of the furnace body 1 by a connecting plate. A sealing ring is provided at each connection point, and the connecting frame 11 is connected to the connecting plate at the upper end of the lower corrugated pipe 401.

[0028] like Figure 1 Both the primary adjustment mechanism 25 and the secondary adjustment mechanism 26 are electric sliding tables. The slider of the primary adjustment mechanism 25 is equipped with a first connecting seat, and the slider of the secondary adjustment mechanism 26 is equipped with a second connecting seat. A first guide rod 9 and a second guide rod 10 are also provided at the top of the furnace body 1, penetrating the connecting plate. The first connecting seat is slidably sleeved on the first guide rod 9 and fixedly connected to the connecting plate at the upper end of the lower corrugated pipe 401. The second connecting seat is slidably sleeved on the second guide rod 10 and fixedly connected to the connecting plate at the upper end of the upper corrugated pipe 402. To ensure smoother extension and retraction of the waveguide 31, each electric sliding table is used in conjunction with one first guide rod 9 or one second guide rod 10. The primary adjustment mechanism 25 has two such mechanisms. Figure 3 They are located on the left and right sides of the lower corrugated pipe 401, respectively; similarly, there are two secondary adjustment mechanisms 26, located on the left and right sides of the upper corrugated pipe 402, respectively.

[0029] In use, when the primary regulating mechanism 25 is driven, the secondary regulating mechanism 26 operates synchronously with the primary regulating mechanism 25. That is, when the box cover 12 moves up and down, the stirring paddle 8 moves up and down synchronously. After the box cover 12 is attached to the heat preservation box 3, the primary and secondary regulating mechanisms 26 stop operating, the magnetron 21 operates, and the material is heated. After heating for a certain period of time, the secondary regulating mechanism 26 drives the stirring paddle 8 to continue moving downwards, descending to the preset height. The stirring paddle 8 stirs the molten material. During the stirring operation, the stirring paddle 8 can move up and down to make the molten material mix evenly.

[0030] The stirring drive mechanism includes a stirring drive motor 6 and a magnetic fluid seal 5. The magnetic fluid seal 5 is sealed and connected to the upper end of the bellows. The upper end of the rotating shaft of the magnetic fluid seal 5 is connected to the output shaft of the stirring drive motor 6, and the lower end is connected to the stirring shaft 7. The magnetic fluid seal 5 plays a dynamic sealing role when connected to the stirring drive motor.

[0031] like Figure 3 To facilitate material placement, a support frame is installed on the outside of the furnace body 1, and an electric cylinder 19 is mounted on the support frame. A first through hole is provided on the side of the furnace body 1 away from the furnace door 2, and a connecting sleeve is connected to the first through hole. The output shaft of the electric cylinder 19 is slidably and sealed to the connecting sleeve. A support seat 20 is provided at the end of the output shaft of the electric cylinder 19, and the insulation box 3 is mounted on the support seat 20. When materials need to be placed or removed, the furnace door 2 is opened, and then the electric cylinder 19 drives the support seat 20 to move outward from the furnace body 1. The support seat 20 drives the insulation box 3, pushing the insulation box 3 out from the open side of the furnace body 1, allowing the construction personnel to place or remove materials. After the materials are placed or removed, the electric cylinder 19 drives the support seat 20 and the insulation box 3 to return to their original positions.

[0032] like Figure 1 , Figure 3 The furnace body 1 has a second through-hole, to which an atmosphere control pipe is connected. The atmosphere control pipe is equipped with a vacuum connector 22 and an air inlet connector 23. An air extraction valve is connected to the vacuum connector 22, and an air inlet valve is connected to the air inlet connector 23. The furnace body 1 also has a third through-hole 24, to which an exhaust pipe is connected, and an exhaust valve is connected to the exhaust pipe. The vacuum connector 22, air inlet connector 23, and exhaust pipe work together to control the atmosphere inside the furnace, meeting the requirements for special alloy smelting. A vacuum pump is connected to the vacuum connector 22, and a special gas source is connected to the air inlet connector 23. A pressure gauge is also installed on the furnace body 1 to monitor the internal pressure.

[0033] If a vacuum heating environment is required, close the inlet and outlet valves, open the extraction valve, and use a vacuum pump to evacuate the furnace body 1 using a pressure gauge. If an inert atmosphere heating environment is required, first use a vacuum pump to evacuate the sealed heating area to a basic vacuum (recommended ≤100Pa), then perform the first replacement by slowly opening the inlet valve and filling inert gas to atmospheric pressure (pressure gauge shows 101 kPa), then fully open the exhaust valve to expel the gas; repeat the above vacuuming, filling, and venting operations at least 3 times, and finally fill in inert gas to the target pressure (atmospheric pressure or slightly positive pressure). If a special reaction gas is required to participate in the heating reaction, first use a vacuum pump to evacuate to a basic vacuum, fill with high-purity nitrogen to slightly positive pressure (50 kPa), repeat the vacuuming-nitrogen filling cycle at least 3 times, and finally introduce the reaction gas; for processes that require continuous introduction of reaction gas and discharge of reaction products (such as CVD deposition, gas reduction, etc.), a dynamic gas flow system must be established, that is, when introducing special reaction gas, the exhaust valve must also be kept open. The vacuum pump can be the Pfeiffer HiCube-80-Eco.

[0034] like Figure 3 , Figure 5 It also includes a quick-lock mechanism, which includes a connecting seat 13 on the furnace body 1, a quick-lock shaft 14 hinged to the connecting seat 13, a handwheel 15 threadedly connected to the quick-lock shaft 14, and a pressing sleeve 17 rotatably connected to the lower end of the handwheel 15 via a bearing; a connecting handle 30 is provided on the furnace cover corresponding to the quick-lock shaft 14, the connecting handle 30 extends to the outside of the furnace cover, and a C-type clamp 16 is provided at one end of the connecting handle 30 located on the outside of the furnace cover, the C-type clamp 16 being adapted to the quick-lock shaft 14; when opening the furnace door 2, hold the handwheel 15 and rotate the handwheel 15 counterclockwise to disengage the pressing sleeve 17 from the C-type clamp 16, and pull the quick-lock shaft 14 outward to disengage the quick-lock shaft 14 from the C-type clamp 16, thus opening the quick-lock mechanism, and then rotating to open the furnace door 2. After closing the furnace door 2, the quick-lock mechanism needs to be used to lock it. When locking, pull the quick-lock shaft 14 inward, insert the quick-lock shaft 14 into the C-type clamp 16, and then hold the handwheel 15 and rotate the handwheel 15 clockwise so that the crimping sleeve 17 abuts against the end face of the C-type clamp 16, and the quick-lock mechanism is locked.

[0035] In this embodiment, the insulated box 3 is assembled from a bottom plate and side panels; the modular insulated box 3 facilitates the replacement of damaged parts (such as partially ablated side panels), reducing maintenance costs. The bottom plate, side panels, and lid 12 can be made of alumina-based ceramic fiber composite material. The inner walls of the bottom plate, side panels, and lid 12 can be coated with silicon carbide or ferrite microwave-absorbing coatings, efficiently converting microwave energy into heat energy. This indirectly heats the material to be melted through thermal radiation and convection, enabling materials that cannot normally absorb microwaves to heat up rapidly.

[0036] A thermocouple 18 is installed on the furnace body 1, and a temperature measuring hole is provided on the side panel of the insulation box 3. The thermocouple 18 is inserted into the interior of the insulation box 3 through the temperature measuring hole; the thermocouple 18 directly monitors the internal temperature of the insulation box 3 through the temperature measuring hole. The thermocouple 18, magnetron 21, stirring drive motor 6, primary adjustment structure, and secondary adjustment mechanism 26 are all connected to the main controller.

[0037] like Figure 4 The furnace body 1 is also connected to a mounting base 27, and a camera 28 is installed inside the mounting base 27. A transparent quartz plate 29 is also installed inside the mounting base 27 in front of the camera 28. Through the camera 28, it is possible to effectively monitor whether the box cover 12 is spliced ​​to the insulation box 3 and monitor abnormal conditions inside the furnace in real time (such as whether there is material overflow). The camera 28 can be a pinhole camera 28.

[0038] The above description is merely a preferred embodiment of the present utility model and does not limit the scope of the present utility model. All equivalent changes made based on the content of the present utility model specification and its drawings are included within the scope of the present utility model.

Claims

1. A microwave melting furnace, comprising a furnace body (1), an open and hinged furnace door (2) on one side of the furnace body (1); a heat preservation box (3) is provided inside the furnace body (1); and a magnetron (21) for emitting microwaves into the furnace body (1) is provided on the furnace body (1), characterized in that: The furnace body (1) is sealed with a bellows at the top, and a stirring drive mechanism is provided at the upper end of the bellows. The stirring drive mechanism is connected to a stirring shaft (7), which is located in the bellows. A stirring paddle (8) is provided at the lower end of the stirring shaft (7). The furnace body (1) also includes a lifting drive mechanism, which is connected to the bellows and is used to drive the bellows to extend and retract.

2. The microwave melting furnace of claim 1, wherein: The corrugated pipe includes an upper corrugated pipe (402) and a lower corrugated pipe (401) that are sealed together. The lifting drive mechanism is located at the top of the upper corrugated pipe (402), and the lower end of the lower corrugated pipe (401) is sealed to the top of the furnace body (1). The lifting drive mechanism includes a first-level adjustment mechanism (25) and a second-level adjustment mechanism (26). The first-level adjustment mechanism (25) is connected to the lower corrugated pipe (401), and the second-level adjustment mechanism (26) is connected to the upper corrugated pipe (402). A connecting frame (11) is provided inside the lower corrugated pipe (401), and the bottom of the connecting frame (11) is connected to the cover (12) of the heat preservation box (3). The stirring shaft (7) is set through the cover (12).

3. The microwave melting furnace of claim 2, wherein: Both the primary adjustment mechanism (25) and the secondary adjustment mechanism (26) are electric slides. The slider of the primary adjustment mechanism (25) is provided with a first connecting seat, and the slider of the secondary adjustment mechanism (26) is provided with a second connecting seat. The top of the furnace body (1) is also provided with a first guide rod (9) and a second guide rod (10). The first connecting seat is slidably sleeved on the first guide rod (9) and connected and fixed to the lower corrugated pipe (401). The second connecting seat is slidably sleeved on the second guide rod (10) and connected and fixed to the upper corrugated pipe (402).

4. The microwave melting furnace of claim 1, wherein: The stirring drive mechanism includes a stirring drive motor (6) and a magnetic fluid seal (5). The magnetic fluid seal (5) is sealed and connected to the upper end of the bellows. The upper end of the rotating shaft of the magnetic fluid seal (5) is connected to the output shaft of the stirring drive motor (6), and the lower end is connected to the stirring shaft (7).

5. The microwave melting furnace of claim 1, wherein: It also includes a support frame, on which an electric cylinder (19) is installed; a first through hole is provided on the side of the furnace body (1) away from the furnace door (2), and a connecting sleeve is connected to the first through hole. The output shaft of the electric cylinder (19) is slidably sealed to the connecting sleeve. A support seat (20) is provided at the end of the output shaft of the electric cylinder (19), and the heat preservation box (3) is installed on the support seat (20).

6. The microwave melting furnace of claim 1, wherein: The furnace body (1) is provided with a second through hole, and an atmosphere control pipe is connected to the second through hole. The atmosphere control pipe is provided with a vacuum connector (22) and an air inlet connector (23). An air extraction valve is connected to the vacuum connector (22), and an air inlet valve is connected to the air inlet connector (23). The furnace body (1) is provided with a third through hole (24), and an exhaust pipe is connected to the third through hole (24). An exhaust valve is connected to the exhaust pipe.

7. The microwave melting furnace of claim 1, wherein: It also includes a quick-lock mechanism, which includes a connecting seat (13) on the furnace body (1), a quick-lock shaft (14) hinged on the connecting seat (13), a handwheel (15) threaded on the quick-lock shaft (14), and a pressure sleeve (17) rotatably connected to the lower end of the handwheel (15) through a bearing; a connecting handle (30) is provided on the furnace cover corresponding to the quick-lock shaft (14), the connecting handle (30) extends to the outside of the furnace cover, and a C-type clamp (16) is provided at one end of the connecting handle (30) located on the outside of the furnace cover, and the C-type clamp (16) is adapted to the quick-lock shaft (14).

8. The microwave melting furnace of claim 1, wherein: The insulated box (3) is made of a bottom plate and side panels.

9. The microwave melting furnace according to claim 1, characterized in that: A thermocouple (18) is installed on the furnace body (1), and a temperature measuring hole is provided on the side panel of the insulation box (3). The thermocouple (18) is inserted into the insulation box (3) through the temperature measuring hole.

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