A noble metal smelting furnace and a control device thereof

Abstract

The present application relates to the technical field of intermediate frequency furnace, in particular to a noble metal smelting furnace and a control device thereof. The noble metal smelting furnace comprises a heating mechanism, and the heating mechanism comprises an induction coil. A wave plate is arranged in the induction coil, the wave plate divides the induction coil into a liquid inlet channel and a liquid outlet channel, and a communication port is formed in the wave plate. The area of the induction coil in contact with the material is a heating area, and the area not in contact is an adjusting area. Part of the cooling liquid in the liquid inlet channel in the heating area flows into the adjusting area of the liquid inlet channel, and part of the cooling liquid directly flows into the liquid outlet channel through the communication port to realize rapid reflux, which accelerates the circulation speed of the cooling liquid in the heating area, thereby improving the cooling effect of the area. The present application provides a noble metal smelting furnace and a control device thereof to solve the problems of damage to the insulating column and the insulating layer, and uneven cooling and low efficiency of the induction coil when the induction coil is heated and longitudinally deformed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intermediate frequency furnaces, in particular to a noble metal smelting furnace and a control device thereof. BACKGROUND

[0002] An intermediate frequency furnace is a power supply device that converts power frequency 50Hz alternating current into intermediate frequency (usually 300Hz to 10000Hz). Its working principle is to first convert three-phase power frequency alternating current into direct current, and then convert the direct current into adjustable intermediate frequency alternating current to supply a resonant circuit composed of a capacitor and an induction coil. The intermediate frequency alternating current flowing through the induction coil produces a high-density alternating magnetic field, which cuts the metal material contained in the coil, thereby generating strong eddy current in the material for heating. Compared with other casting equipment, the intermediate frequency induction furnace has the advantages of high thermal efficiency, short smelting time, less loss of alloy elements, wide smelting material, less environmental pollution, and accurate control of metal liquid temperature and composition.

[0003] The induction coil is a spiral component made of large hollow copper pipes, usually fixed on a solid support, and lined with refractory material (furnace lining). When intermediate frequency alternating current passes through the coil, a high-speed alternating magnetic field is generated. The induction coil does not directly heat up, and the process of melting metal is based on electromagnetic induction effect and Joule heat effect generated inside the metal. The existing induction coil is usually fixed by an insulating column and an insulating layer is provided on the outside during use. However, when the induction coil is heated and deformed longitudinally, it is easy to produce a bulging phenomenon, causing inter-turn deformation, thereby causing damage to the insulating column and the insulating layer.

[0004] A adjusting structure of intermediate frequency furnace induction coil is provided in the utility model patent with publication number CN222418505U. The structure adjusts the spacing between multiple groups of induction coils to change the density of their distribution, thereby facilitating the control of the heating position and temperature distribution of the heated material, and improving the heating effect for different material temperature requirements. However, the device has the problem of uneven cooling: when using a spiral cooling pipe for cooling, the cooling water continuously absorbs heat during flow, causing the water temperature at the outlet to be significantly higher than that at the inlet. This results in a decrease in the temperature difference between the outlet cooling medium and the coil, reducing the heat exchange efficiency and making the cooling effect in this area relatively weak. In addition, since the metal liquid surface is usually below the upper edge of the induction coil during smelting, the coil area below the liquid surface directly contacts the high-temperature melt, and its working temperature is much higher than that above the liquid surface, so stronger cooling is required. The uniform cooling method of the spiral cooling pipe cannot effectively strengthen the cooling of this high-temperature area, and the overall cooling efficiency needs to be improved. SUMMARY

[0005] This invention provides a precious metal smelting furnace and its control device to solve the problems of damage to the insulating pillars and insulating layers caused by longitudinal deformation of the existing induction coil when heated, as well as uneven cooling and low efficiency of the induction coil.

[0006] The present invention discloses a precious metal smelting furnace and its control device, which adopts the following technical solution: A precious metal smelting furnace includes an intermediate frequency furnace and a heating mechanism. The heating mechanism includes a chassis, an induction coil, and an adjustment assembly. The chassis is disposed inside the intermediate frequency furnace, and the axis of the chassis is vertically arranged.

[0007] An induction coil is mounted on a chassis and wound continuously in a spiral shape along the chassis's axial direction. A cavity containing coolant is formed within the induction coil, and a corrugated plate is fixedly installed inside the coil, positioned along the spiral extension direction of the coil. The corrugated plate divides the cavity into an inlet channel and an outlet channel. The two ends of the induction coil are designated as the first end and the second end. The first end of the induction coil serves as the inlet of the inlet channel and the outlet of the outlet channel. At the second end of the induction coil, the inlet and outlet channels are interconnected.

[0008] A connecting port is provided on the corrugated plate, located at the highest point of the material inside the medium-frequency furnace, connecting the liquid inlet and outlet channels. The area where the induction coil contacts the material is the heating zone, and the area where the induction coil does not contact the material is the adjustment zone.

[0009] In the inlet channel, some of the coolant in the heating zone flows into the regulating zone, and some flows into the outlet channel. The regulating component adjusts the flow rate of the coolant flowing into the regulating zone based on the temperature difference between the heating zone and the regulating zone; the temperature difference and the flow rate are inversely proportional.

[0010] Furthermore, a precious metal smelting furnace also includes multiple fixed plates, which are vertically arranged and sequentially distributed along the circumference of the induction coil. Each fixed plate is fixedly connected to the side of the induction coil away from the axis. Each fixed plate includes a first plate and a second plate, with the second plate positioned above the first plate. The first plate is slidably connected to the chassis, and the second plate abuts against the first plate and is movable relative to the first plate.

[0011] The connection port corresponds to the junction of the first plate and the second plate on one of the fixed plates. The temperature difference between the heating area and the adjustment area causes the induction coil in the adjustment area to expand, and the second plate moves relative to the first plate to prevent the local expansion of the induction coil from damaging the first plate.

[0012] Furthermore, in each fixed plate, the first plate and the second plate are connected by a first elastic element.

[0013] Further, the first plate is capable of sliding along the radial direction of the base, and the first plate moves away from the axis of the base when the induction coil expands.

[0014] Further, the induction coil comprises a coil body, a first section and a second section, the coil body is cylindrical, and the first section and the second section are connected to the two ends of the coil body respectively. The wave crests of the wave plate in the coil body point upwards, and the wave troughs point downwards. The wave plate in the coil body is used for supporting the two sides of the coil body in the radial direction.

[0015] Further, the adjusting assembly is corresponding to the communication port, and the adjusting assembly comprises a sliding plate and a shunt plate. The sliding plate is slidingly arranged on the induction coil. The sliding plate is capable of sliding along the circumferential direction of the induction coil. The shunt plate is fixedly arranged on the sliding plate, and the shunt plate is located in the adjusting area and in the liquid inlet channel. When the shunt plate moves from the position corresponding to the wave crest of the wave plate to the position corresponding to the wave trough, the flow area between the shunt plate and the wave plate gradually increases.

[0016] Further, the adjusting assembly further comprises a protrusion and a return spring. The protrusion is fixedly connected with the sliding plate. The return spring is connected with the protrusion and the induction coil. The protrusion moves to drive the sliding plate to move synchronously.

[0017] Further, the adjusting assembly further comprises a driving unit, and the driving unit comprises an adjusting rod and a limiting column. The limiting column is fixedly arranged on the first plate corresponding to the communication port. One end of the adjusting rod is rotatably arranged on the second plate corresponding to the communication port, and the other end of the adjusting rod is fixedly provided with an abutting column. The side of the adjusting rod away from the axis of the induction coil abuts against the limiting column.

[0018] The protrusion is provided with an inclined surface and a vertical surface, and the inclined surface and the vertical surface are sequentially arranged along the direction from top to bottom. In the initial state, the abutting column abuts against the vertical surface. The adjusting rod is positively rotated, so that the abutting column changes from being in contact with the vertical surface of the protrusion to being in contact with the inclined surface. Under the action of the return spring, the protrusion moves.

[0019] Further, the connecting position of the adjusting rod and the second plate is provided with a torsional spring. When the first plate moves away from the axis of the induction coil relative to the second plate, the adjusting rod is positively rotated under the action of the torsional spring.

[0020] A control device of a noble metal smelting furnace utilizes a noble metal smelting furnace, which comprises a first power connection plate and a second power connection plate. The first power connection plate is connected with a first end of an induction coil, and the second power connection plate is connected with a second end of the induction coil, and is used for electrifying the induction coil.

[0021] The control device of the noble metal smelting furnace has the beneficial effects that: the noble metal smelting furnace of the present application is provided with a heating mechanism, the induction coil is electrified, and the material is heated after the induction coil is electrified.

[0022] The cooling liquid flows from the first end to the second end of the induction coil in the liquid inlet channel, and then turns into the liquid outlet channel, and flows back from the second end to the first end of the induction coil through the liquid outlet port to cool the induction coil. In this process, the temperature of the cooling liquid in the liquid inlet channel gradually increases when flowing from the first end to the second end, and the temperature of the cooling liquid in the liquid outlet channel gradually decreases when flowing from the second end to the first end. The two channels are adjacent to each other, so that heat exchange occurs between the hot and cold cooling liquids. This helps to make the temperature distribution of the induction coil more uniform, so that the cooling of the material is also more uniform.

[0023] When the highest position of the material is aligned with the communication port, the temperature of the induction coil in the corresponding heating area is higher than that of the induction coil in the adjusting area. Part of the cooling liquid in the liquid inlet channel of the heating area flows into the liquid inlet channel of the adjusting area, and part of the cooling liquid directly flows into the liquid outlet channel through the communication port to achieve rapid reflux, which increases the circulation speed of the cooling liquid in the heating area and improves the cooling effect of the area. The flow rate of the cooling liquid flowing into the liquid outlet channel is greater than that flowing into the adjusting area, and this design improves the overall cooling efficiency.

[0024] If the adjusting area is not cooled in time, the temperature difference between the heating area and the adjusting area will decrease. The adjusting assembly adjusts the flow rate of the liquid flowing into the heating area according to the temperature difference between the heating area and the adjusting area, and the temperature difference and the flow rate of the liquid are inversely proportional. The adjusting assembly increases the flow rate of the liquid flowing into the heating area, thereby enhancing the cooling effect of the adjusting area and effectively preventing the induction coil in the adjusting area from being deformed excessively. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0026] Figure 1 A structure schematic diagram of a precious metal smelting furnace and a control device thereof provided by an embodiment of the present application;

[0027] Figure 2 A structure schematic diagram of a precious metal smelting furnace provided by an embodiment of the present application;

[0028] Figure 3 A structure schematic diagram of a precious metal smelting furnace provided by an embodiment of the present application; Figure 2 An enlarged view of position A in FIG. 6;

[0029] Figure 4 An enlarged view of position B in FIG. 6; Figure 2 An enlarged view of position B in FIG. 6;

[0030] Figure 5 Part structure schematic view of a heating mechanism of a noble metal smelting furnace provided by an embodiment of the present application is provided;

[0031] Figure 6 Part structure sectional view of a heating mechanism of a noble metal smelting furnace provided by an embodiment of the present application is provided.

[0032] In the figure: 100, intermediate frequency furnace; 201, base plate; 202, induction coil; 2021, liquid inlet channel; 2022, liquid outlet channel; 203, first plate; 2032, compression spring; 204, second plate; 2041, limiting column; 205, adjusting rod; 2051, abutting column; 2052, torsion spring; 206, first power connection plate; 207, second power connection plate; 208, liquid inlet; 209, liquid outlet; 210, wave plate; 211, communication port; 302, sliding plate; 3021, protruding block; 303, reset spring; 304, shunt plate. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0034] Reference Figures 1 to 6 As shown in the figure, the noble metal smelting furnace provided by the embodiment of the present application comprises an intermediate frequency furnace 100 and a heating mechanism. The heating mechanism comprises a base plate 201, an induction coil 202 and an adjusting assembly. The base plate 201 is arranged in the intermediate frequency furnace 100, and the axis of the base plate 201 is arranged vertically.

[0035] The induction coil 202 is wound in the intermediate frequency furnace 100, and the induction coil 202 is arranged on the base plate 201 and continuously wound into a spiral shape along the axial direction of the base plate 201. A cavity is formed in the induction coil 202, and the cavity contains cooling liquid. A wave plate 210 is fixedly arranged in the induction coil 202, and the wave plate 210 is arranged along the spiral extension direction of the induction coil 202. The wave plate 210 divides the cavity into a liquid inlet channel 2021 and a liquid outlet channel 2022. The two ends of the induction coil 202 are a first end and a second end, respectively. The first end of the induction coil 202 is a liquid inlet 208 of the liquid inlet channel 2021 and a liquid outlet 209 of the liquid outlet channel 2022. At the second end of the induction coil 202, the liquid inlet channel 2021 and the liquid outlet channel 2022 are in communication with each other.

[0036] The wave plate 210 is provided with a communication port 211, which is located at the highest position of the material in the intermediate frequency furnace 100, and the communication port 211 connects the liquid inlet channel 2021 and the liquid outlet channel 2022. The area of the induction coil 202 in contact with the material is the heating area, and the area of the induction coil 202 not in contact with the material is the adjusting area, which is above the heating area.

[0037] The cooling liquid in the liquid inlet channel 2021 in the heating area flows into the adjusting area of the liquid inlet channel 2021 and part of it flows into the liquid outlet channel 2022. The adjusting assembly adjusts the flow of liquid into the adjusting area according to the temperature difference between the heating area and the adjusting area, and the temperature difference and the flow of liquid are inversely proportional.

[0038] The material is placed in the induction coil 202, and the highest position of the material is at the communication port 211. The induction coil 202 is energized, and the material is heated after the induction coil 202 is energized.

[0039] At the same time of heating the material, the cooling liquid is introduced into the liquid inlet channel 2021 from the liquid inlet 208 to cool the induction coil 202. The cooling liquid flows from the first end to the second end of the induction coil 202 in the liquid inlet channel 2021, and then flows into the liquid outlet channel 2022, and then flows from the second end to the first end of the induction coil 202 from the liquid outlet 209. In this process, the temperature of the cooling liquid in the liquid inlet channel 2021 gradually increases from the first end to the second end, while the temperature of the cooling liquid in the liquid outlet channel 2022 gradually decreases from the second end to the first end. The two channels are adjacent, so that heat exchange occurs between the hot and cold cooling liquids. This helps to make the temperature distribution of the induction coil 202 more uniform, so that the cooling of the material is also more uniform.

[0040] To prevent the material from overflowing due to explosive boiling when heated, the highest position of the material should be lower than the uppermost end of the induction coil 202. When the highest position of the material is aligned with the communication port 211, the temperature of the induction coil 202 in the corresponding heating area will be higher than that of the induction coil 202 in the adjusting area.

[0041] Part of the cooling liquid in the liquid inlet channel 2021 of the heating area flows into the liquid inlet channel 2021 of the adjusting area to cool the adjusting area. Part of the cooling liquid directly flows into the liquid outlet channel 2022 through the communication port 211 to achieve rapid reflux, which speeds up the circulation speed of the cooling liquid in the heating area, thereby improving the cooling effect of the area. The flow of cooling liquid into the liquid outlet channel 2022 is greater than the flow to the adjusting area, which improves the overall cooling efficiency.

[0042] If the cooling of the adjusting area is not timely, the temperature difference between the adjusting area and the heating area will decrease. The adjusting assembly adjusts the flow of the liquid into the heating area according to the temperature difference between the heating area and the adjusting area, and the temperature difference and the flow of the liquid are inversely proportional. The adjusting assembly increases the flow of the liquid into the heating area, thereby enhancing the cooling effect of the adjusting area and effectively preventing the inductor 202 of the adjusting area from being deformed excessively.

[0043] In the embodiment, the noble metal smelting furnace further comprises a plurality of fixing plates, the fixing plates are vertically arranged, the fixing plates are sequentially distributed along the circumference of the inductor 202, and each fixing plate is fixedly connected to the side away from the axis of the inductor 202. Each fixing plate comprises a first plate 203 and a second plate 204, and the second plate 204 is located on the upper side of the first plate 203. The first plate 203 is slidingly connected to the bottom disc 201, the second plate 204 abuts against the first plate 203, and the second plate 204 can move relative to the first plate 203.

[0044] The communication port 211 corresponds to the joint of the first plate 203 and the second plate 204 on one of the fixing plates. When the temperature difference between the heating area and the adjusting area causes the inductor 202 in the adjusting area to expand, the second plate 204 moves relative to the first plate 203, thereby preventing the local expansion of the inductor 202 from damaging the first plate 203.

[0045] In the embodiment, the first plate 203 of each fixing plate is fixedly provided with a compression spring 2032 along the radial direction of the inductor 202. The compression spring 2032 is fixedly connected to the second plate 204.

[0046] In the embodiment, the first plate 203 can slide along the radial direction of the bottom disc 201, and the inductor 202 moves the first plate 203 away from the axis of the bottom disc 201 when the inductor 202 expands as a whole.

[0047] When the inductor 202 expands due to the increase in temperature, the diameter of the inductor 202 increases. Since the first plate 203 can slide along the radial direction of the bottom disc 201, the first plate 203 moves away from the axis as the inductor 202 expands, thereby adapting to the change, maintaining the pitch, and preventing the expansion from damaging the fixing plate.

[0048] In the embodiment, the induction coil 202 comprises a coil body, a first section and a second section, the coil body is cylindrical, and the first section and the second section are connected with two ends of the coil body respectively. The wave crests of the wave plates 210 in the coil body are upward, and the wave troughs are downward. The wave plates 210 in the coil body are used for supporting two sides of the coil body in the radial direction, so as to prevent the two sides of the coil body in the radial direction from being recessed to the inside of the cavity when the induction coil 202 is expanded by heat. The setting of the wave plates 210 increases the contact area when the liquid inlet channel 2021 and the liquid outlet channel 2022 exchange heat, so as to accelerate the heat exchange speed of the cooling liquid in the liquid inlet channel 2021 and the liquid outlet channel 2022, and improve the cooling efficiency.

[0049] In the embodiment, a sliding groove is arranged on the induction coil 202, and the sliding groove is arranged along the circumference of the induction coil 202. The sliding groove corresponds to the communication port 211 and communicates with the communication port 211. The adjusting assembly corresponds to the communication port 211, and the adjusting assembly comprises a sliding plate 302 and a shunt plate 304. The sliding plate 302 is slidingly arranged in the sliding groove. The sliding plate 302 can slide along the circumference of the induction coil 202.

[0050] The shunt plate 304 is fixedly arranged on the sliding plate 302, the shunt plate 304 is in the adjusting area and in the liquid inlet channel 2021. In the initial state, the shunt plate 304 corresponds to the wave crest of the wave plate 210. When the shunt plate 304 moves from the position corresponding to the wave crest of the wave plate 210 to the position corresponding to the wave trough, the flow area between the shunt plate 304 and the wave plate 210 gradually increases. When the shunt plate 304 moves from the position corresponding to the wave trough of the wave plate 210 to the position corresponding to the wave crest, the flow area between the shunt plate 304 and the wave plate 210 gradually decreases.

[0051] In the embodiment, the adjusting assembly further comprises a protrusion 3021 and a reset spring 303. The protrusion 3021 is fixedly connected with the sliding plate 302. The reset spring 303 is connected with the protrusion 3021 and the induction coil 202. The protrusion 3021 moves to drive the sliding plate 302 to move synchronously.

[0052] In the embodiment, the adjusting assembly further comprises a driving unit, and the driving unit comprises an adjusting rod 205 and a limiting column 2041. The limiting column 2041 is fixedly arranged on the first plate 203 corresponding to the communication port 211. One end of the adjusting rod 205 is rotatably arranged on the second plate 204 corresponding to the communication port 211, and the other end of the adjusting rod 205 is fixedly arranged with an abutting column 2051. The side of the adjusting rod 205 away from the axis of the induction coil 202 abuts against the limiting column 2041.

[0053] The protruding block 3021 is provided with an inclined surface and a vertical surface along one side of the circumference of the induction coil 202, and the inclined surface and the vertical surface are located on the side of the protruding block 3021 away from the return spring 303. The inclined surface and the vertical surface are sequentially arranged along the direction from top to bottom. Along the direction from top to bottom, the inclined surface gradually moves away from the return spring 303.

[0054] In the initial state, the abutting column 2051 abuts against the vertical surface. When the adjusting rod 205 is positively rotated, the abutting column 2051 changes from being in contact with the vertical surface of the protruding block 3021 to being in contact with the inclined surface, and the protruding block 3021 moves under the action of the return spring 303. The positive rotation of the adjusting rod 205 causes the abutting column 2051 to move upward and away from the induction coil 202.

[0055] In the present embodiment, a torsion spring 2052 is arranged at the connection between the adjusting rod 205 and the second plate 204. When the first plate 203 moves away from the axis of the induction coil 202 relative to the second plate 204, the adjusting rod 205 is positively rotated under the action of the torsion spring 2052.

[0056] A control device of a noble metal smelting furnace utilizes a noble metal smelting furnace, which comprises a first power connection plate 206 and a second power connection plate 207. The first power connection plate 206 is connected to the first end of the induction coil 202, and the second power connection plate 207 is connected to the second end of the induction coil 202, for electrifying the induction coil 202, and the induction coil 202 heats the material after being electrified.

[0057] Working process: In the initial state, the first plate 203 and the second plate 204 are on the same vertical surface, and the abutting column 2051 abuts against the vertical surface. The material is placed into the induction coil 202, and the highest part of the material is located at the communication port 211. Then the induction coil 202 is electrified through the first power connection plate 206 and the second power connection plate 207, and the induction coil 202 heats the material after being electrified.

[0058] While the material is being heated, the cooling liquid is introduced into the liquid inlet passage 2021 from the liquid inlet 208 to cool the induction coil 202. The cooling liquid flows from the first end to the second end of the induction coil 202 in the liquid inlet passage 2021, and then flows into the liquid outlet passage 2022, and then flows back to the liquid outlet 209 from the second end to the first end of the induction coil 202. In this process, the temperature of the cooling liquid in the liquid inlet passage 2021 gradually increases when flowing from the first end to the second end, and the temperature of the cooling liquid in the liquid outlet passage 2022 gradually decreases when flowing from the second end to the first end. The two passages are adjacent to each other, so that heat exchange occurs between the hot and cold cooling liquids. This helps to make the temperature distribution of the induction coil 202 more uniform, so that the cooling of the material is also more uniform.

[0059] To prevent the material from overflowing due to the explosion boiling when the material is heated, the highest position of the material should be lower than the uppermost end of the induction coil 202. When the highest position of the material is aligned with the communication port 211, the temperature of the corresponding heating area induction coil 202 is higher than the temperature of the induction coil 202 in the adjusting area.

[0060] In the initial state, the shunt plate 304 corresponds to the wave crest of the wave plate 210, and at this time, the flow area between the two is the smallest. The part of the cooling liquid in the liquid inlet channel 2021 of the heating area flows into the liquid inlet channel 2021 of the adjusting area to cool the adjusting area. Part of the cooling liquid directly flows into the liquid outlet channel 2022 through the communication port 211 to achieve rapid reflux, which accelerates the circulation speed of the cooling liquid in the heating area, thereby improving the cooling effect of the area. The flow of the cooling liquid flowing into the liquid outlet channel 2022 is greater than the flow to the adjusting area, and this design improves the overall cooling efficiency.

[0061] If the adjusting area is not cooled in time, the temperature difference between the adjusting area and the heating area will decrease. This will cause the induction coil 202 in the adjusting area to expand due to overheating, and the diameter will become larger, thereby pushing the second plate 204 to move away from the shaft center.

[0062] Due to the resistance of the limiting column 2041 on the side of the adjusting rod 205 away from the shaft center of the induction coil 202, the movement of the second plate 204 will force the adjusting rod 205 to rotate in the positive direction under the action of the torsional spring 2052. The rotation of the adjusting rod 205 drives the abutting column 2051 at the end of the adjusting rod 205 to move upward, and the abutting column 2051 changes from being in contact with the vertical surface of the protrusion 3021 to being in contact with the inclined surface. This change releases the locking of the protrusion 3021, and the return spring 303 can drive the protrusion 3021 and the connected sliding plate 302 to move. Finally, the sliding plate 302 drives the shunt plate 304 on it to displace.

[0063] The shunt plate 304 moves from the wave crest position to the wave trough position, so that the flow area between the shunt plate 304 and the wave plate 210 increases, thereby enhancing the cooling effect of the adjusting area and effectively preventing the induction coil 202 in the adjusting area from being excessively deformed.

[0064] When the overall temperature of the induction coil 202 rises and is heated to expand, its diameter will become larger. Since the first plate 203 can slide along the radial direction of the chassis 201, the first plate 203 will move away from the shaft center as the induction coil 202 expands, thereby adapting to the changes, maintaining the pitch, and preventing damage to the fixed plate caused by the expansion.

[0065] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A noble metal smelting furnace, characterized in that: comprising a medium frequency furnace and a heating mechanism; the heating mechanism comprises a base plate, an induction coil and an adjusting assembly; the base plate is arranged in the medium frequency furnace, and an axis of the base plate is arranged vertically; the induction coil is arranged on the base plate, and the induction coil is continuously wound into a spiral shape along an axial direction of the base plate; a cavity is formed in the induction coil, and the cavity contains cooling liquid; a wave plate is fixedly arranged in the induction coil, and the wave plate is arranged along a direction in which the induction coil extends spirally; the wave plate divides the cavity into a liquid inlet channel and a liquid outlet channel; two ends of the induction coil are a first end and a second end respectively, the first end of the induction coil is a liquid inlet of the liquid inlet channel and a liquid outlet of the liquid outlet channel; at the second end of the induction coil, the liquid inlet channel and the liquid outlet channel are communicated with each other; a communication port is formed in the wave plate, the communication port is located at a highest position of materials in the medium frequency furnace, and the communication port enables the liquid inlet channel and the liquid outlet channel to communicate with each other; a region where the induction coil contacts the materials is a heating region, and a region where the induction coil does not contact the materials is an adjusting region; part of the cooling liquid in the liquid inlet channel in the heating region flows into the adjusting region of the liquid inlet channel, and part of the cooling liquid flows into the liquid outlet channel; the adjusting assembly adjusts a flow of the liquid flowing into the adjusting region according to a temperature difference between the heating region and the adjusting region, and the temperature difference and the flow of the liquid are inversely proportional; the induction coil comprises a coil body, a first section and a second section, the coil body is in a cylindrical shape, and the first section and the second section are connected to two ends of the coil body respectively; a wave crest of the wave plate in the coil body faces upward, and a wave trough of the wave plate faces downward, and the wave plate in the coil body is used for supporting two sides in a radial direction of the coil body; the adjusting assembly corresponds to the communication port, and the adjusting assembly comprises a sliding plate and a flow distribution plate; the sliding plate is slidingly arranged on the induction coil; the sliding plate can slide along a circumferential direction of the induction coil; the flow distribution plate is fixedly arranged on the sliding plate, the flow distribution plate is located in the adjusting region and in the liquid inlet channel, and when the flow distribution plate moves from a position corresponding to the wave crest of the wave plate to a position corresponding to the wave trough, a flow area between the flow distribution plate and the wave plate gradually increases.

2. The noble metal smelting furnace according to claim 1, characterized in that: further comprising a plurality of fixing plates, the fixing plates are arranged vertically, the fixing plates are sequentially distributed along a circumferential direction of the induction coil, and each fixing plate is fixedly connected to a side of the induction coil away from an axis; each fixing plate comprises a first plate and a second plate, the second plate is located on an upper side of the first plate; the first plate is slidingly connected to the base plate, the second plate abuts against the first plate, and the second plate can move relative to the first plate; the communication port corresponds to an intersection of the first plate and the second plate on one of the fixing plates, and when a temperature difference between the heating region and the adjusting region causes the induction coil in the adjusting region to expand, the second plate moves relative to the first plate, so as to prevent the induction coil from locally expanding to damage the first plate.

3. The noble metal smelting furnace according to claim 2, characterized in that: in each fixing plate, the first plate and the second plate are connected by a first elastic member.

4. The noble metal smelting furnace according to claim 2, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The first plate is capable of sliding along the radial direction of the chassis, and the first plate moves away from the axis of the chassis when the inductor coil expands.

5. The noble metal smelting furnace according to claim 1, characterized in that: The adjusting assembly further comprises a protrusion and a return spring; the protrusion and the sliding plate are fixedly connected; the return spring is connected to the protrusion and the inductor coil; the movement of the protrusion drives the synchronous movement of the sliding plate.

6. The noble metal smelting furnace according to claim 5, characterized in that: The adjusting assembly further comprises a driving unit, which comprises an adjusting rod and a limiting column; the limiting column is fixedly arranged on the first plate corresponding to the communication port; one end of the adjusting rod is rotatably arranged on the second plate corresponding to the communication port, and the other end of the adjusting rod is fixedly provided with an abutting column; the side of the adjusting rod away from the axis of the inductor coil abuts against the limiting column; The protrusion is provided with an inclined surface and a vertical surface, which are sequentially arranged along the direction from top to bottom; in the initial state, the abutting column abuts against the vertical surface; the forward rotation of the adjusting rod changes the contact between the abutting column and the vertical surface to the contact between the abutting column and the inclined surface, and the protrusion moves under the action of the return spring.

7. The noble metal smelting furnace according to claim 6, characterized in that: The connecting part of the adjusting rod and the second plate is provided with a torsion spring; when the first plate moves away from the axis of the inductor coil relative to the second plate, the adjusting rod is positively rotated under the action of the torsion spring.

8. A control device of a noble metal smelting furnace, which utilizes the noble metal smelting furnace according to any one of claims 1-7, characterized in that: The control device comprises a first power connection plate and a second power connection plate; the first power connection plate is connected to the first end of the inductor coil, and the second power connection plate is connected to the second end of the inductor coil, for energizing the inductor coil.

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