Novel induction melting furnace capable of preheating

Abstract

The utility model discloses a novel induction smelting furnace capable of preheating, which comprises a furnace cover, a furnace body and a furnace door assembly, the furnace cover is arranged at the top end of the furnace body, the furnace door assembly is used for sealing a side edge opening of the furnace body, and a furnace cover lifting driving assembly is arranged on the furnace cover so that the furnace cover can be lifted and rotationally adjusted relative to the furnace body. And a resistance heater is arranged in the furnace body and is used for preheating the mold. According to the utility model, the furnace cover is convenient to move away by arranging the furnace cover lifting driving assembly, safety and reliability are realized, meanwhile, the reflecting screen assembly is arranged on the furnace cover for protecting the vacuum gate valve, and the service life of the furnace cover is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of induction melting furnaces, and particularly relates to a new type of preheatable induction melting furnace. Background Technique

[0002] Vacuum induction melting method is one of the most widely used methods in the field of vacuum metallurgy. High-temperature alloys such as nickel-based, cobalt-based, and iron-based alloys are all melted by vacuum induction melting method, and their hot working performance and mechanical properties are significantly improved. Elastic alloys, expansion alloys, etc. are almost all melted by vacuum induction melting method, which can absolutely guarantee the material properties and quality.

[0003] In the patent document with the publication number: CN207635847U, a new type of vacuum induction melting furnace is disclosed. The device includes a cooling system, a high-frequency induction machine, an insulating partition, a high-frequency induction heating coil, a temperature detector, a crucible, a temperature display screen, an intake valve I, a vacuum gauge, an intake valve II, a vacuum heating furnace, an observation window, a vacuum pump, and a vacuum bellows. The cooling system is connected to the high-frequency induction machine through a cooling water pipe; the insulating partition is installed on the side of the vacuum heating furnace; the high-frequency induction heating coil passes through the insulating partition and enters the vacuum heating furnace; the temperature detector is arranged in the vacuum heating furnace; the crucible is placed in the high-frequency induction heating coil; the temperature display screen is arranged on the side of the vacuum heating furnace; the intake valve I is installed on the top of the vacuum heating furnace; the vacuum gauge is installed on the side of the intake valve I; the intake valve II is arranged on the upper part of the vacuum heating furnace; the observation window is arranged on the side of the vacuum heating furnace; the vacuum pump is connected to the vacuum heating furnace through a vacuum bellows; the high-frequency induction heating coil includes an inner coil, an outer coil, and a magnetic conductor; the outer coil is arranged outside the inner coil; the magnetic conductor is embedded outside the outer coil.

[0004] Although this melting furnace can heat the mold through the heating coil, there are still certain limitations in the use process:

[0005] 1. There is a lack of relevant structures and equipment for automatically opening the furnace cover. Therefore, during the operation process, the furnace cover has to be opened completely by the operator, which is time-consuming and laborious and has potential safety hazards;

[0006] 2. The valve body on the furnace cover does not have corresponding protection components. The splashing of molten materials and high-temperature baking after the materials are melted are likely to damage the valve body on the furnace cover and reduce its service life. Content of the Utility Model

[0007] The purpose of the utility model is to provide a new type of preheatable induction melting furnace in view of the deficiencies of the prior art. By setting a furnace cover lifting drive assembly, it is convenient to move the furnace cover away, which is safe and reliable. At the same time, a reflection screen assembly is installed on the furnace cover to protect the vacuum gate valve and extend its service life.

[0008] The technical solution adopted by the utility model is a new type of preheatable induction melting furnace, which includes a furnace cover, a furnace body and a furnace door assembly. The furnace cover is installed on the top of the furnace body, and the furnace door assembly is used to close the side opening of the furnace body. A furnace cover lifting drive assembly is installed on the furnace cover so that the furnace cover can be lifted and rotated relative to the furnace body. A resistance heater is installed in the furnace body to preheat the mold.

[0009] Further, the furnace cover lifting drive assembly includes a drive shaft, a guide seat and a power transmission unit. There are two guide seats, both of which are fixedly installed on the furnace body. The drive shaft is movably inserted through the guide seat. The top of the drive shaft is rotatably connected to the furnace cover. A thrust ball bearing is installed on the top of the drive shaft. The lower end face of the thrust ball bearing contacts the shoulder on the drive shaft, and the upper end face of the thrust ball bearing contacts the furnace cover. A round nut is installed at the top of the drive shaft through thread fit. The round nut can interfere with the furnace cover to limit the separation of the furnace cover and the drive shaft. The power transmission unit is used to drive the drive shaft to move up and down within a certain range.

[0010] Further, the power transmission unit includes an upper drive flange, a lower drive flange, a screw jack and a drive motor. The upper drive flange is fixedly installed at the bottom of the drive shaft. The screw jack and the drive motor are both fixedly installed on the furnace body and are connected by a flange between them. The lower drive flange is fixedly connected to the top end of the lead screw of the screw jack.

[0011] Further, an upper limit switch and a lower limit switch are fixedly installed on the furnace body. The upper limit switch and the lower limit switch can interfere with the upper drive flange and the lower drive flange respectively.

[0012] Further, the upper drive flange and the lower drive flange are concentric. Four through holes are evenly distributed circumferentially on the upper drive flange and the lower drive flange, and a coupling screw pair is inserted between the relative through holes. A spring is installed between the bottom end of the coupling screw pair and the lower surface of the lower drive flange.

[0013] Further, a vacuum gate valve, a melting position observation window, a reflection screen assembly, an infrared thermometer, a vacuum pressure gauge and a pouring position observation window are installed on the furnace cover. The vacuum gate valve is used to connect with an external temperature measurement, sampling and feeding device. The melting position observation window and the pouring position observation window are respectively used for operators to observe the melting situation in the crucible after melting and the pouring situation during pouring. The reflection screen assembly is used to block the baking of the molten metal solution on the valve plate of the vacuum gate valve. The infrared thermometer is used for non-contact temperature measurement of the surface of the material in the crucible. The vacuum pressure gauge is used to detect the pressure in the furnace body.

[0014] Further, the reflection screen assembly includes a central axis, a dynamic seal, a connecting plate, a first reflection screen, and a second reflection screen. The first reflection screen and the second reflection screen are installed on the connecting plate in layers. The central axis rotates through the furnace cover. A bottom plate is fixedly installed at the bottom end of the central axis. The connecting plate is fixedly connected to the bottom plate. The dynamic seal is installed on the central axis.

[0015] Further, a bracket is fixedly installed on the central axis. The bracket is fixedly connected to the dynamic seal. A rotating handle is installed at the top end of the bracket.

[0016] The beneficial effects of the present utility model are as follows:

[0017] 1. A resistance heater is arranged inside the furnace body to preheat the casting mold in advance, which can solve the problem of splashing caused by the overflow of gas in the ingot mold during the casting process, can largely solve the temperature drop generated during the mold loading process, reduce defects such as pores generated inside the finished ingot after solidification, and improve the yield of the metal ingot.

[0018] 2. A reflection screen assembly is arranged on the furnace cover. On the one hand, the reflection screen assembly can prevent the splashing of the melted material on the vacuum gate valve. On the other hand, it can block the high-temperature baking of the valve plate of the vacuum gate valve by the high-temperature solution in the crucible, reduce the failure rate of the vacuum gate valve, and improve the service life of the valve plate of the gate valve.

[0019] 3. The furnace cover lifting drive assembly adopts a form that combines the lifting of a screw jack with the gravity of the furnace cover, spring preloading, and vacuum adsorption. On the one hand, it optimizes the structure of the conventional hydraulic drive, which has reliable sealing but pollutes the equipment and is difficult to maintain, simplifies the complexity of the furnace cover lifting, and on the other hand, it utilizes the self-weight of the furnace cover. During the process of the motor driving the screw jack to descend, a spring preloading force is applied after the upper and lower flanges are separated. It solves the problem that the drive motor stop signal is advanced or delayed at the moment when the furnace cover is closed under the condition of direct drive of the screw jack. It largely reduces the failure rate of the motor and the screw jack and improves the reliable performance of the seal. At the same time, the form of spring preloading and vacuum adsorption can also absorb the shock wave generated during the explosion of the melting furnace piercing, improve the safety performance of the equipment, and reduce the risk coefficient of the operation of the operator. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0021] Figure 2 It is a top view schematic diagram of the installation structure of the resistance heater of the present utility model;

[0022] Figure 3 It is a schematic diagram of each component on the furnace cover of the present utility model;

[0023] Figure 4Schematic diagram of the reflecting screen assembly of the present utility model;

[0024] Figure 5 Schematic diagram of the lifting drive assembly of the furnace cover of the present utility model;

[0025] Markings in the figure: 5-2, furnace body; 5-3, inductor assembly; 5-4, furnace door assembly; 5-5, resistance heater; 5-1-1, furnace cover; 5-1-3, vacuum gate valve; 5-1-4, observation window at melting position; 5-1-5, reflecting screen assembly; 5-1-5-1, rotating handle; 5-1-5-2, bracket; 5-1-5-3, dynamic seal; 5-1-5-5, central axis; 5-1-5-6, bottom plate; 5-1-5-7, connecting plate; 5-1-5-8, first reflecting screen; 5-1-5-9, second reflecting screen; 5-1-6, infrared thermometer; 5-1-7, vacuum pressure gauge; 5-1-8, observation window assembly at pouring position; 5-1-9, lifting drive assembly of furnace cover; 5-1-9-1, round nut; 5-1-9-2, thrust ball bearing; 5-1-9-3, drive shaft; 5-1-9-4, guide seat; 5-1-9-5, upper limit switch; 5-1-9-6, lower limit switch; 5-1-9-7, upper drive flange; 5-1-9-8, lower drive flange; 5-1-9-9, spring; 5-1-9-10, coupling screw pair; 5-1-9-11, screw jack; 5-1-9-12, drive motor. Specific embodiments

[0026] In order to make the purpose, technical solutions and advantages of the present utility model clearer and more understandable, the technical solutions of the present utility model will be further described in detail below with reference to the accompanying drawings in the embodiments of the present utility model.

[0027] Refer to Figures 1 to 5 , a new type of preheatable induction melting furnace according to the present utility model includes a furnace cover 5-1-1, a furnace body 5-2 and a furnace door assembly 5-4. The furnace cover 5-1-1 is installed at the top of the furnace body 5-2, and the furnace door assembly 5-4 is used to close the side opening of the furnace body 5-2. A lifting drive assembly of the furnace cover is installed on the furnace cover 5-1-1 so that the furnace cover 5-1-1 can be lifted and rotationally adjusted relative to the furnace body 5-2. A resistance heater 5-5 is installed in the furnace body 5-2 to preheat the mold.

[0028] The furnace body 5-2 is of a vertical cylindrical structure with a double-layer water-cooled structure, and spiral unidirectional circulating cooling water channels are arranged between the interlayers. Legs are provided at the bottom of the furnace body 5-2 to rest on the ground. A flange with a rectangular cross-section is provided on the right side to dock with the furnace door assembly 5-4, and a vacuum seal is achieved through an O-ring between them. The furnace door assembly 5-4 consists of a furnace door and a moving trolley. The moving trolley is arranged on the track on the ground, and an installation interface for the furnace door is reserved on the moving trolley. During operation, the furnace door can move together with the trolley assembly to achieve the opening and closing of the furnace door.

[0029] The resistance heater assembly 5-5 is arranged on the mounting plate at the bottom of the furnace door. It is a double-door mechanism, and devices such as a reflection screen, resistance wires, and support magnetic rings are arranged inside. It is mainly used to preheat the casting mold in advance to reduce the temperature difference, remove moisture, and ultimately improve the quality of the ingot.

[0030] An inductor assembly 5-3 is also provided in the furnace body 5-2. It mainly consists of an induction coil assembly and a water-cooled rotating electrode assembly, etc. The two are connected through a copper flange interface, which can achieve the circulation of cooling water on the one hand and has the functions of conducting electricity and vacuum sealing on the other hand.

[0031] The furnace cover lifting drive assembly 5-1-9 includes a drive shaft 5-1-9-3, a guide seat 5-1-9-4, and a power transmission unit. There are two guide seats 5-1-9-1, both of which are fixedly installed on the furnace body 5-2. The drive shaft 5-1-9-3 is movably inserted through the guide seat 5-1-9-4. The top of the drive shaft 5-1-9-3 is rotatably connected to the furnace cover 5-1-1. A thrust ball bearing 5-1-9-2 is installed on the top of the drive shaft 5-1-9-3. The lower end face of the thrust ball bearing 5-1-9-2 contacts the shoulder on the drive shaft 5-1-9-3, and the upper end face of the thrust ball bearing 5-1-9-2 contacts the furnace cover 5-1-1. A round nut 5-1-9-1 is installed at the top end of the drive shaft 5-1-9-3 through threaded fit. The round nut 5-1-9-1 can interfere with the furnace cover 5-1-1 to prevent the furnace cover 5-1-1 from disengaging from the drive shaft 5-1-9-3. The power transmission unit is used to drive the drive shaft 5-1-9-3 to move up and down within a certain range. The power transmission unit includes an upper drive flange 5-1-9-7, a lower drive flange 5-1-9-8, a screw jack 5-1-9-11, and a drive motor 5-1-9-12. The upper drive flange 5-1-9-7 is fixedly installed at the bottom of the drive shaft. The screw jack 5-1-9-11 and the drive motor 5-1-9-12 are both fixedly installed on the furnace body 5-2 and are connected by a flange between them. The lower drive flange 5-1-9-8 is fixedly connected to the top of the lead screw of the screw jack 5-1-9-11. An upper limit switch 5-1-9-5 and a lower limit switch 5-1-9-6 are fixedly installed on the furnace body 5-2. The upper limit switch 5-1-9-5 and the lower limit switch 5-1-9-6 can interfere with the upper drive flange 5-1-9-7 and the lower drive flange 5-1-9-8 respectively. The upper drive flange 5-1-9-7 and the lower drive flange 5-1-9-8 are concentric. Four through holes are circumferentially distributed on the upper drive flange 5-1-9-7 and the lower drive flange 5-1-9-8, and a coupling screw pair is inserted between the opposite through holes. A spring 5-1-9-9 is installed between the bottom end of the coupling screw pair and the lower surface of the lower drive flange 5-1-9-8.

[0032] The round nut 5-1-9-1 is located at the uppermost end of the furnace cover lifting drive assembly 5-1-9, and is connected to the drive shaft 5-1-9-3 through a thread. The thrust ball bearing 5-1-9-2 runs through the drive shaft 5-1-9-3, and the lower end face of the thrust ball bearing 5-1-9-2 contacts the shoulder of the drive shaft 5-1-9-3, and the upper end face contacts the mounting plate of the inner hole of the furnace cover 5-1-1. After the installation is completed, the furnace cover 5-1-1 can rotate around the drive shaft 5-1-9-3. The installation plane of the guide seat 5-1-9-4 contacts the side installation surface of the furnace body 5-2, and is fixedly connected by bolts. The drive shaft 5-1-9-3 is inserted into the inner hole of the guide seat 5-1-9-4, and the guide seat 5-1-9-4 is used to guide the drive shaft 5-1-9-3 to ensure that it can move up and down along the guide seat 5-1-9-4. The lower end of the drive shaft 5-1-9-3 is connected to the upper drive flange 5-1-9-8 by a threaded connection. After the connection, the upper drive flange 5-1-9-8 can move up and down with the drive shaft 5-1-9-3. The spiral elevator 5-1-9-11 is connected to the drive motor 5-1-9-12 by a flange, the bottom mounting plane is in contact with the mounting plate welded on the furnace body 5-2 and is fixed by bolt connection, and the upper end of the spiral elevator screw is connected and fixed to the lower drive flange 5-1-9-8 by a threaded connection. After the installation is completed, under the action of the drive motor 5-1-9-12, the lower drive flange 5-1-9-8 can move up and down with the spiral elevator 5-1-9-11 screw. The upper drive flange 5-1-9-7 and the lower drive flange 5-1-9-8 are concentric, and there are 4 through holes evenly distributed in the circumference, and 4 sets of connecting screw pairs 5-1-9-10 are inserted inside. A spring 5-1-9-9 is installed between the lower end of the connecting screw pair 5-1-9-10 and the lower surface of the lower driving flange 5-1-9-8, respectively, to indirectly provide a certain pre-tightening force for the furnace cover seal. The upper limit switch 5-1-9-5 and the lower limit switch 5-1-9-6 are installed at appropriate positions of the furnace body 5-2 to provide corresponding signals for the switch limit of the furnace cover 5-1-14. After all the installations are completed, when the furnace cover 5-1-1 needs to be opened, the driving motor 5-1-9-12 is electrically rotated, and the lower driving flange 5-1-9-8 moves vertically upward together with the lead screw of the spiral elevator 5-1-9-11. When the upper driving flange 5-1-9-7 and the driving flange 5-1-9-8 are in contact, the driving shaft 5-1-9-3 is pushed upward together with the furnace cover 5-1-1, so that the furnace cover 5-1-1 and the sealing surface of the furnace body 5-2 are separated.When reaching a certain height, the upper limit switch signal is triggered, driving the motor 5-1-9-12 to stop rotating, that is, the furnace cover 5-1-1 is opened in place. Manually push the handle on the furnace cover 5-1-1 to make the furnace cover 5-1-1 rotate around the drive shaft 5-1-9-3, finally creating a space above the upper flange of the furnace body 5-2, and the operator can perform operations such as charging and discharging. When it is necessary to close the furnace, rotate the furnace cover 5-1-1 to directly above the furnace body 5-2. At the same time, the driving motor 5-1-9-12 is energized to rotate in the reverse direction. Under the action of the gravity of the furnace cover 5-1-1, the upper driving flange 5-1-9-7 and the lower driving flange 5-1-9-8 always remain in contact and move downward together. When the flange of the furnace cover 5-1-1 descends to contact the flange of the furnace body 5-2, the furnace cover 5-1-1, the drive shaft 5-1-9-3, and the upper driving flange 5-1-9-7 stop moving downward. However, the lower driving flange 5-1-9-8 continues to move downward under the drive of the driving motor 5-1-9-12, causing the separation between the contact surfaces of the upper and lower flanges. Furthermore, the spring 5-1-9-9 begins to compress, and under the action of the screw, the lower driving flange 5-1-9-8 and the drive shaft 5-1-9-3 are pulled to move downward together, finally applying a certain pre-tightening force on the sealing ring between the furnace cover 5-1-1 and the furnace body 5-2.

[0033] The furnace cover 5-1-1 is equipped with a vacuum gate valve 5-1-3, a melting position observation window 5-1-4, a reflection screen assembly 5-1-5, an infrared thermometer 5-1-6, a vacuum pressure gauge 5-1-7, and a pouring position observation window 5-1-8. The vacuum gate valve 5-1-3 is used to connect with the external temperature measurement, sampling, and feeding device. The melting position observation window 5-1-4 and the pouring position observation window 5-1-8 are respectively used for the operator to observe the melting situation in the crucible after melting and the pouring situation during pouring. The reflection screen assembly 5-1-5 is used to prevent the molten metal solution from baking the valve plate of the vacuum gate valve 5-1-3. The infrared thermometer 5-1-6 is used for non-contact temperature measurement of the surface of the material in the crucible. The vacuum pressure gauge 5-1-7 is used to detect the pressure inside the furnace body.

[0034] The furnace cover 5-1-1 adopts a double-layer butterfly head welding structure, and a one-way circulating water channel is arranged inside for online cooling of the furnace cover 5-1-1. The vacuum gate valve 5-1-3 is in a double-sided sealing form, with one side achieving sealing between the flange directly above the center of the furnace cover 5-1-1, and the other side being able to achieve sealed connection with the external temperature measurement, sampling, and feeding device. The melting position observation window assembly 5-1-4 and the pouring position observation window assembly 5-1-8 are mainly composed of vacuum high-temperature resistant glass and sealing rings, etc., and are respectively used for the operator to observe the melting situation in the crucible after melting and the pouring situation during pouring. The infrared thermometer 5-1-6 is axially aligned with the center of the crucible for non-contact temperature measurement of the surface of the material in the crucible.

[0035] The reflection screen assembly 5-1-5 includes a central axis 5-1-5-5, a dynamic seal 5-1-5-3, a connecting plate 5-1-5-7, a first reflection screen 5-1-5-8 and a second reflection screen 5-1-5-9. The first reflection screen 5-1-5-8 and the second reflection screen 5-1-5-9 are installed on the connecting plate 5-1-5-7 in layers. The central axis 5-1-5-5 rotates through the furnace cover. A bottom plate 5-1-5-6 is fixedly installed at the bottom end of the central axis 5-1-5-5. The connecting plate 5-1-5-7 is fixedly connected to the bottom plate 5-1-5-6. The dynamic seal 5-1-5-3 is installed on the central axis. A bracket 5-1-5-2 is fixedly installed on the central axis 5-1-5-5. The bracket 5-1-5-2 is fixedly connected to the dynamic seal. A rotating handle 5-1-5-1 is installed at the top end of the bracket 5-1-5-2.

[0036] The central axis 5-1-5-5 can rotate relative to the furnace cover. The bracket 5-1-5-2 is fixed to the central axis. Therefore, when the operator rotates the rotating handle 5-1-5-1, the central axis 5-1-5-5 can be driven to rotate. Since the connecting plate 5-1-5-7 is fixed to the bottom plate 5-1-5-6 and the bottom plate 5-1-5-6 is fixed to the central axis 5-1-5-5, the rotation of the central axis 5-1-5-5 can drive the connecting plate 5-1-5-7 to rotate, and further drive the first reflection screen 5-1-5-8 and the second reflection screen 5-1-5-9 to rotate. Under normal conditions, the first reflection screen 5-1-5-8 and the second reflection screen 5-1-5-9 are located between the vacuum gate valve 5-1-3 and the melting crucible, and are used to block the baking of the molten metal solution on the valve plate of the vacuum gate valve 5-1-3. When contact temperature measurement, sampling and secondary feeding are required, the operator can operate the rotating handle 5-1-5-1 to drive the first reflection screen 5-1-5-8 and the second reflection screen 5-1-5-9 to rotate to one side, so as to vacate the space directly above the crucible.

[0037] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art. It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

Claims

1. A novel preheatable induction melting furnace, characterized in that, It includes a furnace cover, a furnace body and a furnace door assembly. The furnace cover is installed on the top of the furnace body. The furnace door assembly is used to close the side opening of the furnace body. A furnace cover lifting drive assembly is installed on the furnace cover so that the furnace cover can be lifted and rotationally adjusted relative to the furnace body. A resistance heater is installed in the furnace body to preheat the mold.

2. The novel preheatable induction melting furnace according to claim 1, wherein The furnace cover lifting drive assembly includes a drive shaft, a guide seat and a power transmission unit. There are two guide seats, both of which are fixedly installed on the furnace body. The drive shaft is movably inserted through the guide seats. The top of the drive shaft is rotatably connected to the furnace cover. A thrust ball bearing is installed on the top of the drive shaft. The lower end face of the thrust ball bearing contacts the shoulder on the drive shaft. The upper end face of the thrust ball bearing contacts the furnace cover. A round nut is installed on the top of the drive shaft through thread fit. The round nut can interfere with the furnace cover to limit the separation of the furnace cover from the drive shaft. The power transmission unit is used to drive the drive shaft to move up and down within a certain range.

3. The novel preheatable induction melting furnace according to claim 2, wherein, The power transmission unit includes an upper drive flange, a lower drive flange, a screw jack and a drive motor. The upper drive flange is fixedly installed at the bottom of the drive shaft. The screw jack and the drive motor are both fixedly installed on the furnace body and are connected by a flange between them. The lower drive flange is fixedly connected to the top end of the lead screw of the screw jack.

4. The novel preheatable induction melting furnace according to claim 3, characterized in that, Upper limit switches and lower limit switches are fixedly installed on the furnace body. The upper limit switch and the lower limit switch can interfere with the upper drive flange and the lower drive flange respectively.

5. The novel preheatable induction melting furnace according to claim 4, characterized in that, The upper drive flange and the lower drive flange are concentric. Four through holes are evenly distributed circumferentially on the upper drive flange and the lower drive flange, and a connecting screw pair is inserted between the opposite through holes. A spring is installed between the bottom end of the connecting screw pair and the lower surface of the lower drive flange.

6. The novel preheatable induction melting furnace according to claim 1, characterized in that, A vacuum gate valve, a melting position observation window, a reflection screen assembly, an infrared thermometer, a vacuum pressure gauge and a pouring position observation window are installed on the furnace cover. The vacuum gate valve is used to connect with an external temperature measurement, sampling and feeding device. The melting position observation window and the pouring position observation window are respectively used for operators to observe the melting condition in the crucible after melting and the pouring condition during pouring. The reflection screen assembly is used to block the baking of the molten metal solution on the valve plate of the vacuum gate valve. The infrared thermometer is used to measure the temperature of the surface of the material in the crucible in a non-contact manner. The vacuum pressure gauge is used to detect the pressure in the furnace body.

7. The novel preheatable induction melting furnace according to claim 6, wherein The reflection screen assembly includes a central shaft, a dynamic seal, a connecting plate, a first reflection screen and a second reflection screen. The first reflection screen and the second reflection screen are installed on the connecting plate in layers. The central shaft rotates through the furnace cover. A bottom plate is fixedly installed at the bottom end of the central shaft. The connecting plate is fixedly connected to the bottom plate. The dynamic seal is installed on the central shaft.

8. The novel preheatable induction melting furnace according to claim 7, characterized in that, A bracket is fixedly installed on the central shaft. The bracket is fixedly connected to the dynamic seal. A rotating handle is installed at the top end of the bracket.

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