A vacuum melting furnace for precious metal purification

Abstract

The present invention discloses a vacuum melting furnace for precious metal purification, comprising a heating tank, a vacuum exhaust assembly, and a melting crucible. A control stand is fixedly mounted on one side of the heating tank, a lifting drive rod assembly is provided on the inner side of the control stand, and a top cover is connected to realize the lifting operation of the top cover. A fixed paddle shaft is fixedly mounted on the bottom surface of the top cover for supporting and positioning the precious metal melt in the melting crucible. The melting crucible is detachably sleeved on the inner side of the heating tank for easy loading, unloading, and cleaning. In the present invention, a rotary plug disk and a melting crucible are synchronously rotated to achieve vacuum suction while stirring the precious metal melt, so that the precious metal melt is evenly heated during the melting process, ensuring melting efficiency and uniformity, and improving the precious metal purification effect.

Description

Technical Field

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

[0002] Vacuum melting furnaces used for precious metal purification primarily rely on a single heating device to provide heat. Common heating methods include resistance heating, arc heating, or induction heating. The primary function of these heating devices is to rapidly raise the furnace temperature to the melting temperature of the precious metal, converting the precious metal from a solid state to a liquid state for further purification in a vacuum or inert atmosphere. The vacuum system is a crucial component of vacuum melting furnaces for precious metal purification. It is used to extract air from the melting chamber during the early stages of melting to prevent oxidation of the precious metals by oxygen in the air at high temperatures. Traditional vacuum systems typically include a vacuum pump and sealing device to evacuate the interior of the melting furnace to a low pressure.

[0003] While precious metal purification requires high melting temperatures and vacuum levels, traditional melting furnaces struggle to incorporate effective stirring mechanisms. This is primarily due to mechanical seals struggling to maintain an effective seal at high temperatures, resulting in shaft-type stirring components unable to operate reliably in high-temperature vacuum environments. This inability to meet the extremely high vacuum requirements of vacuum melting furnaces used for precious metal purification has led to traditional vacuum melting furnaces being unable to incorporate various stirring mechanisms, making uneven heating of the precious metal melt a persistent problem.

[0004] Traditional vacuum melting furnaces typically pump down to a certain vacuum level during the initial melting and heating phase. However, during the melting and heating process, impurities in the precious metal purification process generate gases upon heating, often causing the vacuum level to drop, impacting the purification process. Traditional vacuum melting furnaces typically rely solely on heating devices for heat source supply, resulting in poor heating efficiency and temperature control, leading to uneven heating of the precious metal melt. Furthermore, the lack of effective stirring and scraping mechanisms within the furnaces results in impurities remaining on the bottom and inner walls of the molten liquid, reducing the purity of the refined product.

[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 achieve the purpose of solving the problems and improving 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 technologies.

[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, and 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 drive motor located at the bottom end of the vacuum exhaust assembly is fixedly installed on one side of the control stand. A high-frequency heating coil is sleeved on the outer periphery of the melting crucible. The structure allows the precious metal melt to be evenly 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 traditional melting furnaces.

[0008] The vacuum exhaust assembly comprises a fixed pump box, a rotating stopper disc, an eccentric guide seat, and several pistons. Oppositely arranged intake pipes and exhaust chambers are located on either side of the fixed pump box. A rotating collar that mates with the crucible is fixedly connected to the top of the intake pipe, and a dynamic seal is provided on the surface of the rotating collar that abuts the crucible surface. The crucible surface is provided with several suction holes located inside the rotating collar. The bottom of the crucible is provided with a conical protrusion. An exhaust gas processor is fixedly connected to the end of the exhaust chamber. The eccentric guide seat has a slide groove, and several sliding pins are slidably mounted inside the groove, corresponding to the pistons. The rotating stopper disc has several plunger holes, and the pistons slide inside each of the plunger holes. The axis of the eccentric guide seat is offset from the axis of the rotating stopper disc and away from one side of the intake pipe. This structure, through multi-channel gas flow and sealed connections, ensures the stability of the vacuum environment within the furnace, prevents gas leakage, and achieves efficient vacuum extraction, meeting the high vacuum requirements for precious metal purification.

[0009] In a preferred embodiment, the present invention can be further configured as follows: a sensor group is installed on the inner side of the control stand, communicating with the inner side of the air inlet pipe to detect the real-time vacuum state and ambient temperature within the crucible. A control panel is installed on the surface of the control stand to control the operating power of the drive motor and high-frequency heating coil. This structure uses the sensor group to monitor the vacuum state and temperature within the crucible in real time, and adjusts the operating power via the control panel, ensuring stable system operation and improving the accuracy of the precious metal purification process.

[0010] In a preferred embodiment, the present invention can be further configured as follows: the surface of the fixed-paddle shaft is equipped with a bottom-scraping paddle, a side-scraping paddle, a self-rotating paddle, and a conical-surface scraping paddle. The bottom ends of the bottom-scraping paddle and the conical-surface scraping paddle extend to the bottom surface of the melting crucible cavity and slide in contact with the bottom surface of the melting crucible cavity and the surface of the suction hole, respectively. The side of the side-scraping paddle slides in contact with the inside of the melting crucible. The top end of the self-rotating paddle is rotatably connected to the surface of the fixed-paddle shaft, and is configured 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 and conical-surface scraping paddles, ensuring uniform heating of the liquid, avoiding bottom residue, and improving the purification effect.

[0011] In a preferred embodiment, the present invention can be further configured as follows: the bottom heating plate is provided with a heating wire for heating the bottom surface of the 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, combining the bottom heating plate and the high-frequency heating coil, forms a highly efficient heating source, ensuring uniform heating of the bottom of the crucible. High-frequency current regulation enables precise temperature control, further improving the efficiency of precious metal smelting.

[0012] In a preferred embodiment, the present invention can be further configured such that the surface of the rotary plug disk slides and seals against the inner side of the fixed pump box and the bottom surface of the bottom heating disk. The piston and plunger hole are evenly distributed circumferentially on the inner side of the rotary plug disk, with the plunger hole radially extending through the rotary plug disk. A piston sealing ring is sleeved on the outer circumference of the piston and slides against the inner side of the plunger hole. This sealing structure, through the cooperation of the plunger hole and piston, ensures airtightness within the vacuum exhaust assembly system, prevents vacuum leakage, and ensures the long-term stability of the vacuum level.

[0013] In a preferred embodiment, the present invention can be further configured such that the chute is annular, the sliding pin slides in a circular motion along the inner side of the chute, and the eccentric guide seat is detachably connected to the bottom surface of the conical projection. This design of connecting and disconnecting the eccentric guide seat and the conical projection facilitates easy loading and unloading of the crucible, facilitating rapid replacement and cleaning of the molten precious metal after purification, and enhancing the ease of operation of the equipment.

[0014] In a preferred embodiment, the present invention can be further configured as follows: the suction hole is located on the axis of the crucible and the rotary plug disk, and the suction hole has an arc-shaped conical structure to disperse the molten precious metal onto the inner wall of the crucible to improve heating uniformity. The bottom surface of the conical projection is provided with a plurality of sockets that are compatible with the top of the eccentric guide seat, and each socket is arranged in a straight line along the radial direction of the conical projection. By designing the eccentric guide seat to connect with the different sockets of the suction hole, the eccentricity of the eccentric guide seat can be adjusted, thereby controlling the movement rhythm of the piston, adapting to the vacuum suction requirements under different working conditions, and ensuring system efficiency.

[0015] In a preferred embodiment, the present invention can be further configured as follows: the exhaust gas processor includes a multi-stage filtration assembly and a cooling assembly for filtering and cooling high-temperature gases; the multi-stage filtration assembly is disposed within the exhaust gas processor and sequentially comprises a coarse filtration layer, a microfiltration layer, and an activated carbon layer for removing particulate matter, fine impurities, and harmful gases; the cooling assembly is located at the upper end of the exhaust gas processor and is used to reduce the temperature of the filtered gas to effectively purify the high-temperature gases. This structure, through the combination of multi-stage filtration and cooling in the exhaust gas processor, ensures the safe discharge of high-temperature gases, 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:

[0018] 1. In this invention, vacuum extraction is achieved while stirring the precious metal melt through the synchronously rotating rotary plug disk and melting crucible. This structure ensures uniform heating of the precious metal melt during the smelting process, ensuring smelting efficiency and uniformity, and improving the precious metal purification effect. The multi-channel gas flow design in the vacuum exhaust assembly and its sealed connection structure with the melting crucible ensure the stability of the vacuum environment throughout the smelting process. The sealing design prevents gas leakage and improves the vacuum maintenance efficiency of the equipment.

[0019] 2. In this invention, the relative placement of the intake and exhaust ducts within the vacuum exhaust assembly creates a multi-channel gas flow design. Precisely controlling the position and layout of the intake and exhaust channels ensures rapid and efficient exhaust of furnace gases. The eccentric guide design within the vacuum exhaust assembly offers unique adjustability. The axis of the eccentric guide is offset from the axis of the rotary plug disc, and adjusting the eccentricity allows for control of the movement of each piston. This structural design enables the vacuum system to precisely adjust vacuum extraction efficiency based on varying operating conditions, thereby providing optimal vacuum support throughout the various melting stages.

[0020] 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 melting crucible, and the power is adjusted in real time by 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 scraping of the bottom and wall are achieved, thereby ensuring the uniform stirring of the precious metal molten liquid and no residue at the bottom. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the cross-sectional structure of a heating tank according to an embodiment of the present invention;

[0023] 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;

[0024] Figure 4 This is a schematic diagram of the surface structure of a fixed propeller shaft according to an embodiment of the present invention;

[0025] Figure 5 A schematic diagram of the internal structure of a melting crucible according to an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the exploded structure of a vacuum exhaust assembly according to one embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the rotary plug disc, eccentric guide seat and piston structure of an embodiment of the present invention.

[0028] Reference numerals:

[0029] 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;

[0030] 200, vacuum exhaust assembly; 210, fixed pump box; 220, rotary plug disc; 230, eccentric guide seat; 240, piston; 211, intake pipe; 212, exhaust chamber; 213, rotating collar; 214, dynamic seal; 221, plunger hole; 231, slide groove; 232, slide pin rod;

[0031] 300, melting crucible; 310, suction hole; 320, cone convex; 400, exhaust gas processor. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features therein can be combined with each other without conflict.

[0033] It is to be understood that these descriptions are illustrative only and are not intended to limit the scope of the invention.

[0034] The following is combined with Figure 1-Figure 7A vacuum melting furnace for purifying precious metals is described in some embodiments of the present invention.

[0035] Example 1

[0036] The present invention provides a vacuum melting furnace for precious metal purification, comprising a heating tank 100, a vacuum exhaust assembly 200, and a crucible 300. A control stand 110 is fixedly mounted on one side of the heating tank 100. A lifting drive rod assembly is provided inside the control stand 110 and is connected to a top cover 120 to enable lifting and lowering of the top cover 120. A fixed paddle shaft 130 is fixedly mounted on the bottom surface of the top cover 120 to support and position the molten precious metal within the crucible 300. The crucible 300 is removably sleeved onto the inside of the heating tank 100, facilitating loading, unloading, and cleaning. A bottom heating plate 150 is fixedly mounted on the bottom surface of the heating tank 100. The bottom surface of the bottom heating plate 150 mates with the top surface of the vacuum exhaust assembly 200, ensuring uniform heating of the bottom of the crucible 300. A drive motor 140, located at the bottom end of the vacuum exhaust assembly 200, is fixedly mounted on one side of the control stand 110 to provide power output and drive the system. A high-frequency heating coil 160 is provided on the inner side of the heating tank 100 and is sleeved on the outer periphery of the melting crucible 300 , thereby providing a high-frequency heating coil to improve the melting efficiency.

[0037] 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 is provided with an air inlet pipe 211 and an exhaust chamber 212 arranged opposite to each other on both sides of the surface. The top of the air inlet pipe 211 is fixedly connected to a rotating collar 213 adapted to the melting crucible 300, and is in contact with 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 conical protrusion 320, which is used in conjunction with the eccentric guide seat 230. The end of the exhaust chamber 212 is fixedly connected to an exhaust processor 400, which processes high-temperature gas through the exhaust processor 400 to achieve environmentally friendly emissions. A sliding groove 231 is provided on the surface of the eccentric guide seat 230 , and a plurality of sliding pin rods 232 corresponding to the pistons 240 are slidably mounted on the inner side of the sliding groove 231 , and are slidably sealed through a plurality of plunger holes 221 on the rotary plug disk 220 .

[0038] During operation, the multiple scraping paddles 131, side scraping paddles 132, self-rotating paddles 133, and conical scraping paddles 134 on the fixed paddle shaft 130 generate a stirring effect in different directions within the precious metal melt, achieving uniform heating and mixing of the melt. The system controls the operating power of the drive motor 140 and high-frequency heating coil 160 via the control panel 111 to ensure stable temperature control. This structure, through multi-channel gas flow and adjustable eccentricity, achieves optimal vacuum extraction at different smelting stages, ensuring the purity and efficiency of precious metal purification.

[0039] Example 2

[0040] In this embodiment, the present invention also provides an optimized configuration of a vacuum melting furnace for precious metal purification, which includes a heating tank body 100, a vacuum exhaust component 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.

[0041] 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 sealed and in good vacuum while stirring. The bottom scraping paddle 131, side scraping paddle 132, self-rotating paddle 133 and conical scraping paddle 134 equipped on the fixed paddle shaft 130 can perform corresponding stirring operations at different heating stages, among which 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.

[0042] The eccentricity between the eccentric guide seat 230 and the rotary plug disc 220 in the vacuum exhaust assembly 200 can be adjusted as needed to accommodate varying vacuum extraction requirements. Specifically, multiple sockets provided on the conical projection 320 allow for docking with the top of the eccentric guide seat 230 at various locations, thereby precisely controlling the reciprocating motion of the piston 240 and achieving the desired vacuum retention effect. The multi-channel gas flow design, coordinated through the inlet duct 211 and exhaust chamber 212, allows for the rapid exhaust of impurity gases generated during the smelting process, maintaining a stable vacuum within the system.

[0043] The exhaust gas processor 400 utilizes a multi-stage filtration and cooling assembly, including a coarse filter layer, a microfiltration layer, and an activated carbon layer, to effectively filter particulate matter and harmful gases from high-temperature exhaust gas. A coolant circulation line is provided within the gas flow control channel, allowing the high-temperature gas to be gradually cooled to a safe discharge temperature through the coolant circulation. Furthermore, the control system control panel 111 and sensor group 112 work together to monitor the exhaust gas temperature in real time, ensuring that the gas is discharged under conditions that meet safety standards.

[0044] 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 providing a highly adaptable and precisely controlled vacuum and heating environment in different smelting stages.

[0045] The working principle and use process of the present invention:

[0046] The vacuum melting furnace for precious metal purification 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.

[0047] Synchronous Rotation and Stirring with Vacuum Extraction: This invention achieves uniform heating of the precious metal liquid during the melting process through the synchronized rotation of the rotary plug disc 220 and the melting crucible 300. Furthermore, thanks to the coordination of the bottom scraping paddles 131, side scraping paddles 132, self-rotating paddles 133, and conical scraping paddles 134 on the surface of the melting crucible 300 and the fixed paddle shaft 130, the precious metal liquid is thoroughly stirred during the heating process, avoiding local temperature differences and ensuring uniform melting and purification of the precious metal liquid.

[0048] Multi-channel vacuum system with adjustable eccentricity: The eccentric guide 230 and piston 240 in the vacuum exhaust assembly 200 work together to form a multi-channel gas flow structure. During installation of the crucible 300, the eccentric guide 230 is connected to different sockets on the bottom of the suction hole 310 to adjust the eccentricity of the eccentric guide 230, thereby controlling the movement of each piston 240. The vacuum efficiency is adjusted according to actual operating conditions to meet the vacuum requirements of different melting stages. This system provides a stable vacuum level under different operating conditions and effectively removes impurity gases generated during the melting process, ensuring a stable vacuum environment within the system.

[0049] Efficient Heating and Temperature Control: A multi-stage heating system consisting of a bottom heating plate 150 and a high-frequency heating coil 160 achieves uniform heating of the bottom of the crucible 300. The heating power is adjusted via a control panel 111, ensuring stable temperature control of the precious metal during heating, further improving melting efficiency. A high-frequency current regulator adjusts the power of the high-frequency heating coil 160 in real time, adjusting the heating intensity based on the molten state of the precious metal to meet varying process requirements.

[0050] Exhaust gas treatment and purification: The exhaust gas processor 400 filters and cools high-temperature exhaust gases through a multi-stage filtration system consisting of a coarse filter layer, a microfiltration layer, an activated carbon layer, and a cooling element, ensuring that exhaust gases meet environmental standards. Coolant circulation within the gas flow control channel gradually reduces the gas temperature, ensuring safe discharge of high-temperature exhaust gases and ensuring the environmental performance of the equipment.

[0051] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, illustrative uses of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0052] 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 invention, and that the scope of the 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), wherein 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 blade 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. 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) is provided on the inner side of the heating tank body (100) and is sleeved on the outer periphery of the melting crucible (300); The vacuum exhaust assembly (200) comprises a fixed pump box (210), a rotary plug disc (220), an eccentric guide seat (230) and a plurality of pistons (240). An air intake pipe (211) and an exhaust chamber (212) arranged opposite to each other 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), and 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 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) 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). The pistons (240) are slidably sleeved on the inner sides of the respective 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 (211). The bottom surface of the melting crucible (300) is provided with a conical protrusion (320), the eccentric guide seat (230) is detachably connected to the bottom surface of the conical protrusion (320), and the bottom surface of the conical protrusion (320) is provided with a plurality of sockets adapted to the top end of the eccentric guide seat (230), and the sockets are arranged in a straight line along the radial direction of the conical protrusion (320).

2. 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). A control panel (111) for controlling the operating power of the drive motor (140) and the high-frequency heating coil (160) is provided on the surface of the control stand (110).

3. 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). 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.

4. 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.

5. The vacuum melting furnace for precious metal purification according to claim 1, characterized in that: The surface of the rotary plug disc (220) is in sliding contact with and sealed against the inner side of the fixed pump box (210) and the bottom surface of the bottom heating disc (150); the piston (240) and the plunger hole (221) are evenly distributed on the inner side of the rotary plug disc (220) in a circumferential direction, and the plunger hole (221) radially penetrates the rotary plug disc (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).

6. A vacuum melting furnace for precious metal purification according to claim 1, characterized in that: The slide groove (231) is annular, and the sliding pin rod (232) slides in a circular motion along the inner side of the slide groove (231).

7. 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 collar (213); 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) has an arc-shaped conical structure for dispersing the precious metal melt to the inner wall surface of the melting crucible (300) to improve the heating uniformity.

8. The vacuum melting furnace for precious metal purification according to claim 1, characterized in that: The exhaust gas processor (400) comprises a multi-stage filter assembly and a cooling assembly, and is used for filtering and cooling high-temperature gas; the multi-stage filter assembly 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, and is used for removing particulate matter, fine impurities and harmful gases respectively; the cooling assembly is located at the upper end of the exhaust gas processor (400), and is used for reducing the temperature of the filtered gas, so as to achieve effective purification of the high-temperature gas.

9. A vacuum melting furnace for precious metal purification according to claim 8, characterized in that: The tail gas processor (400) is provided with a gas flow control channel, and a coolant circulation pipe is provided inside the gas flow control channel, so that the high-temperature gas is gradually cooled when passing through the tail gas processor (400), thereby ensuring that the temperature of the gas when discharged meets the safety emission standard.

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