Vacuum melting furnace for precious metal purification

Abstract

The vacuum melting furnace comprises a heating tank body, a vacuum exhaust assembly and a melting crucible, a control vertical frame is fixedly installed on one side of the heating tank body, a lifting driving rod set is arranged on the inner side of the control vertical frame, and the control vertical frame is connected with a top cover so that lifting operation of the top cover can be achieved; a fixed paddle shaft is fixedly installed on the bottom face of the top cover and used for supporting and positioning precious metal melting liquid in a melting crucible, and the melting crucible is detachably connected to the inner side of the heating tank body in a sleeving mode and is convenient to assemble, disassemble and clean. By means of the rotary plug disc and the melting crucible which rotate synchronously, vacuum suction is achieved while precious metal melts are stirred, so that the precious metal melts are evenly heated in the melting process, the melting efficiency and uniformity are ensured, and the precious metal purification effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum melting furnaces, in particular to a vacuum melting furnace for purifying precious metals. Background Art

[0002] The vacuum melting furnace for precious metal purification mainly relies on a single heating device to provide heat source. Common heating methods include resistance heating, arc heating or induction heating. The main function of these heating devices is to quickly raise the temperature in the furnace to the melting temperature of precious metals, so that the precious metals can be transformed from solid to liquid for further purification in a vacuum or inert atmosphere. The vacuum system is an important part of the vacuum melting furnace for precious metal purification. It is used to extract the air inside the melting chamber in the early stage of melting to prevent the precious metals from oxidizing with oxygen in the air at high temperatures. Traditional vacuum systems usually include a vacuum pump and a sealing device to pump the inside of the melting furnace to a low pressure state.

[0003] The purification of precious metals requires high melting temperature and vacuum degree, but it is difficult to install effective stirring structures in traditional melting furnaces. The main reason is that mechanical seals are difficult to maintain effective sealing at high temperatures, resulting in the inability of shaft stirring components to work stably in high-temperature vacuum environments, and unable to meet the extremely high vacuum requirements of vacuum melting furnaces for precious metal purification. Therefore, traditional vacuum melting furnaces for precious metal purification are usually unable to be equipped with various stirring structures, and the problem of uneven heating of precious metal molten liquid is always difficult to solve.

[0004] Traditional vacuum melting furnaces usually pump the interior to a certain vacuum degree in the early stage of melting and heating. However, during the melting and heating process, the impurities in the precious metal purification are heated to produce gas, which often causes the vacuum degree to drop, affecting the purification effect. Traditional vacuum melting furnaces usually only provide heat sources through heating devices, and the heating efficiency and temperature control are poor, and the precious metal melt is prone to uneven heating. In addition, there is no effective stirring and scraping structure inside the melting furnace, which makes it easy for impurities to remain at the bottom and inner wall of the molten liquid, reducing the purification purity.

[0005] In view of this, research and improvement are carried out on the existing problems, and a vacuum melting furnace for precious metal purification is provided to solve the current problems. The purpose is to solve the problems and improve the practical value through this technology. Summary of the invention

[0006] The present invention aims to solve one of the technical problems existing in the prior art or related technology.

[0007] To this end, the technical solution adopted by the present invention is: a vacuum melting furnace for precious metal purification, comprising: a heating tank body, a vacuum exhaust assembly and a melting crucible. A control stand is fixedly installed on one side of the heating tank body, a lifting drive rod group is provided on the inner side of the control stand and is connected to a top cover, a fixed paddle shaft is fixedly installed on the bottom surface of the top cover, the melting crucible is detachably sleeved on the inner side of the heating tank body, a bottom heating plate is fixedly installed on the bottom surface of the heating tank body, and the bottom surface of the bottom heating plate is in contact with the top surface of the vacuum exhaust assembly, a driving motor located at the bottom end of the vacuum exhaust assembly is fixedly installed on one side of the control stand, and a high-frequency heating coil sleeved on the outer periphery of the melting crucible is provided on the inner side of the heating tank body. The structure makes the precious metal melt uniformly heated in a vacuum environment through the relative rotation of the fixed paddle shaft and the melting crucible, thereby improving the melting efficiency and purification effect, and avoiding the problem of uneven heating caused by the lack of stirring in the traditional melting furnace.

[0008] The vacuum exhaust assembly includes a fixed pump box, a rotary plug disc, an eccentric guide seat and a plurality of pistons. The two sides of the surface of the fixed pump box are respectively provided with an intake pipe and an exhaust chamber arranged oppositely. The top of the intake pipe is fixedly connected with a rotating collar matched with the melting crucible, and the surface of the rotating collar is provided with a dynamic seal abutting against the surface of the melting crucible. The surface of the melting crucible is provided with a plurality of suction holes located on the inner side of the rotating collar. The bottom surface of the melting crucible is provided with a cone convex. The end of the exhaust chamber is fixedly connected with an exhaust processor. The surface of the eccentric guide seat is provided with a slide groove, and the inner side of the slide groove is slidably installed with a plurality of sliding pin rods connected one by one with the pistons. The surface of the rotary plug disc is provided with a plurality of plunger holes, and the piston is slidably sleeved on the inner side of each plunger hole. The axis of the eccentric guide seat deviates from the axis of the rotary plug disc and is away from one side of the intake pipe. The structure ensures the stability of the vacuum environment in the furnace and prevents gas leakage through multi-channel gas flow and sealing connection, realizes efficient vacuuming, and meets the high requirements of precious metal purification for vacuum degree.

[0009] In a preferred example, the present invention can be further configured as follows: a sensor group for communicating with the inner side of the air inlet pipe is provided on the inner side of the control stand to detect the real-time vacuum state and internal environment temperature inside the melting crucible, and a control panel for controlling the working power of the drive motor and the high-frequency heating coil is provided on the surface of the control stand. This structure realizes real-time monitoring of the vacuum state and temperature inside the melting crucible through the sensor group, and adjusts the working power through the control panel, thereby ensuring stable operation of the system and improving the accuracy of the precious metal purification process.

[0010] In a preferred example, the present invention can be further configured as follows: the surface of the fixed paddle shaft is provided with a bottom scraping paddle, a side scraping paddle, a self-rotating paddle and a conical scraping paddle, the bottom ends of the bottom scraping paddle and the conical scraping paddle extend to the bottom surface of the inner cavity of the melting crucible and slide in contact with the bottom surface of the inner cavity of the melting crucible and the surface of the suction hole respectively, the side surface of the side scraping paddle slides in contact with the inner side of the melting crucible, and the top end of the self-rotating paddle is rotatably connected to the surface of the fixed paddle shaft for passive self-rotation in the precious metal solution. This structure achieves multi-directional stirring of the precious metal molten liquid through the coordination of multiple bottom scraping paddles to conical scraping paddles, ensures that the liquid is heated evenly, avoids bottom residue, and improves the purification effect.

[0011] In a preferred example, the present invention can be further configured as follows: the surface of the bottom heating plate is provided with a heating wire for heating the bottom surface of the melting crucible, the high-frequency heating coil is spirally wound, and the end of the high-frequency heating coil is electrically connected to a high-frequency current generator. This structure forms an efficient heating source by combining the bottom heating plate and the high-frequency heating coil, ensures uniform heating of the bottom of the melting crucible, and realizes precise temperature control by adjusting the high-frequency current, further improving the smelting efficiency of precious metals.

[0012] In a preferred example, the present invention can be further configured as follows: the surface of the rotary plug disc is in sliding contact with the inner side of the fixed pump box and the bottom surface of the bottom heating disc and is sealed; the piston and the plunger hole are evenly distributed on the inner side of the rotary plug disc in the circumferential direction, and the plunger hole radially penetrates the rotary plug disc; the outer circumference of the piston is sleeved with a piston sealing ring that is in sliding contact with the inner side of the plunger hole. The sealing structure ensures the airtightness of the vacuum exhaust component system through the cooperation of the plunger hole and the piston, prevents vacuum leakage, and ensures the long-term stability of the vacuum degree.

[0013] In a preferred example, the present invention can be further configured as follows: the chute is annular, the slide pin rod slides in a circle along the inner side of the chute, and the eccentric guide seat is detachably connected to the bottom surface of the cone convex. Through the connection and separation design of the eccentric guide seat and the cone convex, convenient loading and unloading of the melting crucible is achieved, which helps to quickly replace and clean the molten liquid after the precious metal is purified, and improves the convenience of equipment operation.

[0014] In a preferred example, the present invention can be further configured as follows: the suction hole is located on the axis of the melting crucible and the rotary plug disk, and the surface of the suction hole is an arc-shaped conical structure for dispersing the precious metal melt to the inner wall surface of the melting crucible to improve the uniformity of heating, and the bottom surface of the cone convex is provided with a plurality of plug holes adapted to the top of the eccentric guide seat, and each plug hole is arranged in a straight line along the radial direction of the cone convex. Through the docking design of the eccentric guide seat and the different plug holes of the suction hole, the eccentricity of the eccentric guide seat is adjusted, thereby controlling the movement rhythm of the piston, adapting to the vacuum suction requirements under different working conditions, and ensuring the efficiency of the system.

[0015] In a preferred example, the present invention can be further configured as follows: the exhaust gas processor includes a multi-stage filter component and a cooling component, which are used to filter and cool the high-temperature gas; the multi-stage filter component is arranged inside the exhaust gas processor, and includes a coarse filter layer, a micro filter layer and an activated carbon layer in sequence, which are used to remove particulate matter, fine impurities and harmful gases respectively; the cooling component is located at the upper end of the exhaust gas processor, which is used to reduce the temperature of the filtered gas to achieve effective purification of the high-temperature gas. This structure ensures the safe discharge of high-temperature gas through the combination of multi-stage filtration and cooling of the exhaust gas processor, meets environmental protection requirements, and improves the safety of the equipment.

[0016] In a preferred example, the present invention can be further configured as follows: the exhaust gas processor is provided with a gas flow control channel, and the gas flow control channel has a coolant circulation pipe inside, so that the high-temperature gas is gradually cooled when passing through the exhaust gas processor to ensure that the temperature of the gas when it is discharged meets the safety emission standards.

[0017] The beneficial effects achieved by the present invention are: 1. In the present invention, vacuum suction is achieved while stirring the precious metal melt by means of the synchronously rotating rotary plug disk and the melting crucible. This structure allows the precious metal melt to be heated uniformly during the smelting process, ensures the smelting efficiency and uniformity, and improves the precious metal purification effect. The multi-channel gas flow design in the vacuum exhaust component and its sealed connection structure with the melting crucible ensure the stability of the vacuum environment during the entire smelting process, and prevents gas leakage through the sealing design, thereby improving the vacuum maintenance efficiency of the equipment.

[0018] 2. In the present invention, the air inlet pipe and the exhaust chamber in the vacuum exhaust assembly are arranged relative to each other to form a multi-channel gas flow design. By precisely controlling the position and layout of the air inlet and exhaust channels, it is ensured that the gas in the furnace can be discharged quickly and effectively. The eccentric guide seat design in the vacuum exhaust assembly has unique adjustability. The axis of the eccentric guide seat deviates from the axis of the rotary plug disc, and the movement process of each piston can be controlled by adjusting the eccentricity. This structural design enables the vacuum system to accurately adjust the efficiency of vacuum suction according to different working conditions, thereby providing optimal vacuum support at different smelting stages.

[0019] 3. In the present invention, the combination of the bottom heating plate and the high-frequency heating coil provides a stable and efficient heating source, which can ensure uniform heating of the bottom of the molten crucible, and adjust the power in real time through the high-frequency current regulator, thereby improving the heating efficiency and the smelting effect of the precious metals. Furthermore, by arranging a variety of scrapers on the fixed paddle shaft, multi-directional stirring and bottom and wall scraping effects are achieved, thereby ensuring the uniformity of stirring of the precious metal molten liquid and no residue on the bottom. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of a heating tank according to an embodiment of the present invention; Figure 3 A schematic diagram of the structure of a vacuum exhaust assembly and a melting crucible according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the surface structure of a fixed propeller shaft according to an embodiment of the present invention; Figure 5 A schematic diagram of the internal structure of a melting crucible according to an embodiment of the present invention; Figure 6 A schematic diagram of the exploded structure of a vacuum exhaust assembly according to an embodiment of the present invention; Figure 7 The figure is a schematic diagram of the rotary plug disc, eccentric guide seat and piston structure of one embodiment of the present invention.

[0021] Reference numerals: 100, heating tank; 110, control stand; 120, top cover; 130, fixed propeller shaft; 140, drive motor; 150, bottom heating plate; 160, high-frequency heating coil; 111, control panel; 112, sensor group; 131, bottom scraping propeller; 132, side scraping propeller; 133, self-rotating propeller; 134, conical scraping propeller; 200, vacuum exhaust assembly; 210, fixed pump box; 220, rotary plug plate; 230, eccentric guide seat; 240, piston; 211, air inlet pipe; 212, exhaust chamber; 213, rotating sleeve ring; 214, dynamic seal; 221, plunger hole; 231, slide groove; 232, slide pin rod; 300, melting crucible; 310, suction hole; 320, cone convex; 400, exhaust gas processor. DETAILED DESCRIPTION

[0022] To make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in combination with specific implementations and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0023] It is to be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention.

[0024] The following is combined with Figure 1-Figure 7 A vacuum melting furnace for purifying precious metals is described in some embodiments of the present invention.

[0025] Example 1 The present invention provides a vacuum melting furnace for precious metal purification, comprising a heating tank body 100, a vacuum exhaust assembly 200 and a melting crucible 300. A control stand 110 is fixedly installed on one side of the heating tank body 100, and a lifting drive rod group is provided on the inner side of the control stand 110 and connected to a top cover 120 to realize the lifting operation of the top cover 120. A fixed paddle shaft 130 is fixedly installed on the bottom surface of the top cover 120 for supporting and positioning the precious metal melt in the melting crucible 300. The melting crucible 300 is detachably sleeved on the inner side of the heating tank body 100 for easy loading, unloading and cleaning. A bottom heating plate 150 is fixedly installed on the bottom surface of the heating tank body 100, and the bottom surface of the bottom heating plate 150 is in contact with the top surface of the vacuum exhaust assembly 200 to ensure uniform heating of the bottom of the melting crucible 300. A driving motor 140 located at the bottom end of the vacuum exhaust assembly 200 is fixedly installed on one side of the control stand 110 to provide power output and realize the driving of the system. A high-frequency heating coil 160 is provided inside the heating tank 100 and is sleeved on the outer periphery of the melting crucible 300 , so as to provide a high-frequency heating coil and improve the smelting efficiency.

[0026] The vacuum exhaust assembly 200 includes a fixed pump box 210, a rotary plug disc 220, an eccentric guide seat 230 and a plurality of pistons 240, wherein the fixed pump box 210 has an air intake pipe 211 and an exhaust chamber 212 arranged oppositely on both sides of the surface, and the top of the air intake pipe 211 is fixedly connected with a rotating collar 213 adapted to the melting crucible 300, and abuts against the surface of the melting crucible 300 through a dynamic seal 214 to achieve sealing. The surface of the melting crucible 300 is provided with a plurality of suction holes 310 located on the inner side of the rotating collar 213 to ensure that the gas is smoothly discharged from the inside of the melting crucible 300 and maintain the vacuum degree. The bottom surface of the melting crucible 300 is provided with a cone convex 320, which is used in conjunction with the eccentric guide seat 230. The end of the exhaust chamber 212 is fixedly connected with an exhaust processor 400, and the high-temperature gas is processed by the exhaust processor 400 to achieve environmentally friendly emissions. A slide groove 231 is provided on the surface of the eccentric guide seat 230 , and a plurality of slide pin rods 232 corresponding to the pistons 240 are slidably mounted inside the slide groove 231 , and are slidably sealed through a plurality of plunger holes 221 on the rotary plug disk 220 .

[0027] During operation, multiple bottom scraping paddles 131, side scraping paddles 132, self-rotating paddles 133 and conical scraping paddles 134 on the fixed paddle shaft 130 produce stirring effects in different directions in the precious metal molten liquid, achieving uniform heating and mixing of the molten liquid. The system controls the working power of the drive motor 140 and the high-frequency heating coil 160 through the control panel 111 to ensure the stability of temperature control. The structure achieves the best vacuum suction effect in different smelting stages through multi-channel gas flow and eccentric adjustable design, ensuring the purity and efficiency of precious metal purification.

[0028] Example 2 In this embodiment, the present invention also provides an optimized configuration of a vacuum melting furnace for precious metal purification, including a heating tank body 100, a vacuum exhaust assembly 200, a melting crucible 300 and an exhaust gas processor 400. This configuration further expands the vacuum maintenance and exhaust gas treatment functions on the basis of Example 1.

[0029] The inner side of the control stand 110 is provided with a sensor group 112 for monitoring, which is connected to the inner side of the air inlet pipe 211 to detect the vacuum state and temperature in the melting crucible 300 in real time. The top cover 120 is connected to the fixed paddle shaft 130 to keep the molten liquid inside the melting crucible 300 in good sealing and vacuum while stirring. The bottom scraping paddle 131, side scraping paddle 132, self-rotating paddle 133 and conical scraping paddle 134 equipped with the fixed paddle shaft 130 can perform corresponding stirring operations at different heating stages, wherein the self-rotating paddle 133 can passively rotate in the molten liquid, effectively enhancing the mixing effect. The combined heating of the bottom heating plate 150 and the high-frequency heating coil 160 makes the heating of the bottom of the melting crucible 300 more uniform, and the heating temperature can be further optimized by adjusting the high-frequency current.

[0030] The eccentricity between the eccentric guide seat 230 and the rotary plug disc 220 in the vacuum exhaust assembly 200 can be adjusted according to the needs to meet different vacuum suction requirements. Specifically, by setting multiple sockets on the cone convex 320, it can be docked with the top of the eccentric guide seat 230 at different positions, so as to accurately control the reciprocating motion process of the piston 240 and achieve an ideal vacuum holding effect. The multi-channel gas flow design cooperates with the inlet pipe 211 and the exhaust chamber 212 to quickly discharge the impurity gas generated during the smelting process and maintain a stable vacuum degree inside the system.

[0031] The exhaust gas processor 400 uses a multi-stage filtering component and a cooling component, including a coarse filter layer, a micro filter layer and an activated carbon layer arranged in sequence, for effectively filtering particulate matter and harmful gases in the high-temperature exhaust gas. A coolant circulation pipeline is arranged in the gas flow control channel, so that the high-temperature gas is gradually cooled to a safe discharge temperature through the coolant circulation. In addition, the control system control panel 111 cooperates with the sensor group 112 to monitor the exhaust gas temperature in real time to ensure that the gas is discharged under conditions that meet safety standards.

[0032] Through the above embodiments, the present invention has achieved a technological breakthrough in maintaining vacuum and uniform heating of precious metal melts, greatly improving the efficiency and effect of precious metal purification, especially in providing a highly adaptable and precisely controlled vacuum and heating environment in different smelting stages.

[0033] The working principle and use process of the present invention: The vacuum melting furnace for purifying precious metals of the present invention realizes efficient purification of precious metals through the synchronous rotation and stirring of the rotary plug plate 220 and the melting crucible 300, the precise vacuum system vacuum exhaust component 200 and the combination of the multi-stage heating structure bottom heating plate 150 and the high-frequency heating coil 160.

[0034] Synchronous rotation stirring and vacuum suction: The present invention realizes uniform heating of the precious metal liquid during the melting process by synchronously rotating the rotary plug disk 220 and the melting crucible 300. At the same time, due to the cooperation of the bottom scraping paddle 131, the side scraping paddle 132, the self-rotating paddle 133 and the conical scraping paddle 134 on the surface of the melting crucible 300 and the fixed paddle shaft 130, the precious metal molten liquid is fully stirred during the heating process, avoiding local temperature differences and ensuring uniform melting and purification of the precious metal liquid.

[0035] Multi-channel vacuum system and adjustable eccentricity design: The eccentric guide seat 230 and the piston 240 in the vacuum exhaust assembly 200 cooperate with each other to form a multi-channel gas flow structure. During the installation of the melting crucible 300, the eccentricity of the eccentric guide seat 230 can be adjusted by docking the eccentric guide seat 230 with different sockets on the bottom of the suction hole 310, thereby controlling the movement process of each piston 240. According to the actual working conditions, the appropriate vacuuming efficiency is adjusted to meet the vacuum requirements of different smelting stages. The system provides a stable vacuum degree under different working conditions, and effectively removes the impurity gas generated during the smelting process to ensure the stability of the vacuum environment inside the system.

[0036] Efficient heating and temperature control: The multi-stage heating system composed of the bottom heating plate 150 and the high-frequency heating coil 160 can adjust the heating power through the control panel 111 to achieve uniform heating of the bottom of the melting crucible 300. This structure ensures the temperature stability of the precious metal during the heating process, further improving the melting efficiency. The power of the high-frequency heating coil 160 can be adjusted in real time through the high-frequency current regulator, and the heating intensity can be adjusted in time according to the molten state of the precious metal to meet different process requirements.

[0037] Exhaust treatment and purification: The exhaust processor 400 filters and cools the high-temperature exhaust through a multi-stage filter assembly including a coarse filter layer, a micro-filter layer, an activated carbon layer and a cooling assembly to ensure that the exhaust gas meets environmental standards. The coolant circulation pipeline in the gas flow control channel can gradually reduce the gas temperature, allowing the high-temperature exhaust gas to be safely discharged, ensuring the environmental performance of the equipment.

[0038] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0039] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A vacuum melting furnace for precious metal purification, characterized in that: include: A heating tank body (100), a vacuum exhaust assembly (200) and a melting crucible (300); a control stand (110) is fixedly mounted on one side of the heating tank body (100); a lifting drive rod group is provided on the inner side of the control stand (110) and is connected to a top cover (120); a fixed paddle shaft (130) is fixedly mounted on the bottom surface of the top cover (120); and the bottom surface of the top cover (120) is in sliding contact with the top of the melting crucible (300); and the melting crucible (300) is detachably sleeved. The control stand (110) is connected to the inner side of the heating tank body (100), a bottom heating plate (150) is fixedly mounted on the bottom surface of the heating tank body (100), and the bottom surface of the bottom heating plate (150) is in contact with the top surface of the vacuum exhaust component (200), a driving motor (140) located at the bottom end of the vacuum exhaust component (200) is fixedly mounted on one side of the control stand (110), and a high-frequency heating coil (160) sleeved on the outer periphery of the melting crucible (300) is provided on the inner side of the heating tank body (100).

2. A vacuum melting furnace for precious metal purification according to claim 1, characterized in that: The vacuum exhaust assembly (200) comprises a fixed pump box (210), a rotating plug disc (220), an eccentric guide seat (230) and a plurality of pistons (240); oppositely arranged air intake pipes (211) and exhaust chambers (212) are respectively provided on both sides of the surface of the fixed pump box (210); a rotating collar (213) adapted to the melting crucible (300) is fixedly connected to the top of the air intake pipe (211); a dynamic seal (214) abutting against the surface of the melting crucible (300) is provided on the surface of the rotating collar (213); an exhaust gas processor (400) is fixedly connected to the end of the exhaust chamber (212); The surface of the eccentric guide seat (230) is provided with a slide groove (231), and a plurality of slide pin rods (232) connected to the pistons (240) in a one-to-one correspondence are slidably mounted on the inner side of the slide groove (231). The surface of the rotary plug disc (220) is provided with a plurality of plunger holes (221), and the pistons (240) are slidably sleeved on the inner sides of the plunger holes (221). The axis of the eccentric guide seat (230) deviates from the axis of the rotary plug disc (220) and is away from one side of the intake duct pipe (211).

3. A vacuum melting furnace for precious metal purification according to claim 1, characterized in that: A sensor group (112) for communicating with the inside of the air inlet pipe (211) is provided on the inner side of the control stand (110) for detecting the real-time vacuum state and internal ambient temperature inside the melting crucible (300), and a control panel (111) for controlling the working power of the drive motor (140) and the high-frequency heating coil (160) is provided on the surface of the control stand (110).

4. A vacuum melting furnace for precious metal purification according to claim 1, characterized in that: The surface of the fixed paddle shaft (130) is provided with a bottom scraping paddle (131), a side scraping paddle (132), a self-rotating paddle (133) and a conical scraping paddle (134); the bottom ends of the bottom scraping paddle (131) and the conical scraping paddle (134) extend to the bottom surface of the inner cavity of the melting crucible (300) and are respectively slidably fitted with the bottom surface of the inner cavity of the melting crucible (300) and the surface of the suction hole (310); the side surface of the side scraping paddle (132) is slidably fitted with the inner side of the melting crucible (300); and the top end of the self-rotating paddle (133) is rotatably connected to the surface of the fixed paddle shaft (130) for passive self-rotation in the precious metal solution.

5. A vacuum melting furnace for precious metal purification according to claim 1, characterized in that: The surface of the bottom heating plate (150) is provided with a heating wire for heating the bottom surface of the melting crucible (300); the high-frequency heating coil (160) is wound in a spiral shape, and the end of the high-frequency heating coil (160) is electrically connected to a high-frequency current generator.

6. A vacuum melting furnace for precious metal purification according to claim 2, characterized in that: The surface of the rotary plug disk (220) is in sliding contact and sealed with the inner side of the fixed pump box (210) and the bottom surface of the bottom heating disk (150); the piston (240) and the plunger hole (221) are evenly distributed on the inner side of the rotary plug disk (220) in a circumferential direction, and the plunger hole (221) radially penetrates the rotary plug disk (220); the outer periphery of the piston (240) is sleeved with a piston sealing ring that is in sliding contact with the inner side of the plunger hole (221).

7. A vacuum melting furnace for precious metal purification according to claim 2, characterized in that: The slide groove (231) is in the shape of a circular ring, the slide pin rod (232) slides in a circular motion along the inner side of the slide groove (231), and the eccentric guide seat (230) is detachably connected to the bottom surface of the conical protrusion (320).

8. A vacuum melting furnace for precious metal purification according to claim 1, characterized in that: The surface of the melting crucible (300) is provided with a plurality of suction holes (310) located inside the rotating sleeve ring (213), and the bottom surface of the melting crucible (300) is provided with a conical protrusion (320); the suction holes (310) are located on the axis of the melting crucible (300) and the rotating plug disk (220), and the surface of the suction holes (310) is in an arc-shaped conical structure for dispersing molten precious metal liquid to the inner wall surface of the melting crucible (300) to improve heating uniformity, and the bottom surface of the conical protrusion (320) is provided with a plurality of plug holes adapted to the top end of the eccentric guide seat (230), and each plug hole is arranged in a straight line along the radial direction of the conical protrusion (320).

9. A vacuum melting furnace for precious metal purification according to claim 2, characterized in that: The exhaust gas processor (400) comprises a multi-stage filter component and a cooling component, which are used to filter and cool the high-temperature gas; the multi-stage filter component is arranged inside the exhaust gas processor (400), and comprises a coarse filter layer, a micro filter layer and an activated carbon layer in sequence, which are used to remove particulate matter, fine impurities and harmful gases respectively; the cooling component is located at the upper end of the exhaust gas processor (400), and is used to reduce the temperature of the filtered gas, so as to achieve effective purification of the high-temperature gas.

10. A vacuum melting furnace for precious metal purification according to claim 9, characterized in that: The exhaust gas processor (400) is provided with a gas flow control channel, and a coolant circulation pipeline is provided inside the gas flow control channel, so that the high-temperature gas is gradually cooled when passing through the exhaust gas processor (400), so as to ensure that the temperature of the gas when discharged meets the safety emission standards.

Images