Electromagnetic induction heating device and use method thereof

Abstract

The invention discloses an electromagnetic induction heating device and a using method thereof, and relates to the technical field of smelting equipment, the electromagnetic induction heating device comprises a crucible containing mechanism, a temperature control mechanism, a gas supply mechanism and a vacuumizing mechanism; the crucible containing mechanism is provided with a base used for containing a crucible. The temperature control mechanism comprises a controller, a first thermocouple and an electromagnetic induction coil; the electromagnetic induction coil can perform electromagnetic induction heating on the crucible; a high-temperature-resistant ceramic protection tube sleeves the outer side of the first thermocouple, and the first thermocouple is inserted into a molten pool in the crucible; the controller can adjust the power of the electromagnetic induction coil; the gas supply mechanism comprises a first gas supply pipe, a second gas supply pipe and a gas mixing bottle; the tail ends of the first gas supply pipe and the second gas supply pipe can be communicated with the interior of the gas mixing bottle; an output port of the gas mixing bottle is communicated with the quartz furnace tube; the first air supply pipe and the second air supply pipe are each provided with a flow monitoring and regulating device. And stable and accurate real-time temperature measurement and temperature control can be realized, and accurate monitoring of the flow and partial pressure of the introduced gas is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of smelting equipment, and in particular to an electromagnetic induction heating device and a suitable use method thereof. Background Art

[0002] At present, high-temperature experiments such as steelmaking and slag melting in laboratories usually use tubular resistance furnaces and electromagnetic induction furnaces as smelting equipment. The electromagnetic induction heating furnace uses Faraday's law of electromagnetic induction. When a conductor is placed in an alternating electromagnetic field, eddy currents will be generated inside the conductor. The eddy currents will generate damping inside the conductive material, causing the material to heat up and achieve a heating effect. It also avoids the loss of heat energy through heat conduction in traditional heating methods, and has the advantages of fast heating speed, high efficiency, and environmental protection. However, most of the current induction heating devices have many technical problems:

[0003] For example, the intelligent temperature control of existing electromagnetic induction furnaces is mostly to use a continuous switching power supply to achieve fine-tuning of the temperature when the temperature is close to the preset value. However, this method causes large temperature fluctuations, and it takes a long time to reach a stable temperature and it is difficult to maintain the temperature in a relatively stable range. The temperature measurement methods of existing electromagnetic induction furnaces are usually the following: 1. Infrared temperature measuring gun measurement; 2. Thermocouple contact furnace tube measurement; 3. Thermocouple insertion into the molten pool measurement (the thermocouple needs to be pulled out immediately after the temperature measurement is completed). However, none of the above three methods can accurately detect and stably control the temperature of the melt in real time;

[0004] Moreover, existing electromagnetic induction melting equipment can often only pass a single gas into the furnace at the same time, and the gas flow is controlled by a rotor flowmeter. The gas flow is read by the naked eye with large errors, and there is no function of simultaneously passing two or more controllable flow gases. Summary of the invention

[0005] The object of the present invention is to provide an electromagnetic induction heating device and a method of using the same, so as to solve the problems existing in the above-mentioned prior art, to achieve stable and accurate temperature measurement and temperature control, and to achieve accurate monitoring of the flow rate and partial pressure of the incoming gas.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides an electromagnetic induction heating device, comprising a crucible holding mechanism, a temperature control mechanism, a gas supply mechanism and a vacuum pumping mechanism; the crucible holding mechanism comprises a fixing frame, a quartz furnace tube, an upper cover and a base; the quartz furnace tube is fixedly arranged on the fixing frame; the quartz furnace tube has a through channel, the upper end opening of the through channel can be closed by the upper cover, and the lower end opening of the through channel can be closed by the base; the base is used to place the crucible; the temperature control mechanism comprises a controller, a first thermocouple and an electromagnetic induction coil; the electromagnetic induction coil is used to be sleeved on the quartz furnace tube, and the electromagnetic induction coil can perform electromagnetic induction heating on the crucible located in the quartz furnace tube after being energized; a high-temperature resistant ceramic protection tube is sleeved on the outer side of the first thermocouple, and the first thermocouple is used to be inserted into the crucible located in the quartz furnace tube in the molten pool; the controller is communicatively connected with the first thermocouple and the electromagnetic induction coil, and the controller can adjust the power of the electromagnetic induction coil; the gas supply mechanism includes a first gas supply pipe, a second gas supply pipe and a mixing gas bottle; the ends of the first gas supply pipe and the second gas supply pipe can be connected to the inside of the mixing gas bottle; the output port of the mixing gas bottle is connected to the third gas supply pipe, and the output port of the third gas supply pipe is used to communicate with the through channel of the quartz furnace tube; the first gas supply pipe and the second gas supply pipe are both provided with a flow monitoring and control device; the flow monitoring and control device can adjust the flow and monitor the flow data; the vacuum pumping mechanism includes a vacuum pump and a connecting pipe; the suction port of the vacuum pump is connected and connected to one end of the connecting pipe, and the other end of the connecting pipe is connected to the through channel of the quartz furnace tube.

[0008] Preferably, a quenching barrel is provided under the base, and a quenching medium is contained in the quenching barrel; a drop hole is provided on the base, and an opening and closing door is provided on the drop hole, and the opening and closing door can block or open the drop hole; the crucible in the quartz furnace tube can fall into the quenching barrel through the drop hole.

[0009] Preferably, the base is fixedly arranged at the output end of the first lifting mechanism, and the output end of the first lifting mechanism can drive the base to rise and fall along the axial direction of the quartz furnace tube.

[0010] Preferably, the electromagnetic induction coil is fixedly arranged at the output end of the second lifting mechanism, and the output end of the second lifting mechanism can drive the electromagnetic induction coil to rise and fall along the axial direction of the quartz furnace tube.

[0011] Preferably, a gas deoxygenation device is connected to the conveying front end of the first gas supply pipe and the second gas supply pipe.

[0012] Preferably, the gas supply mechanism further comprises a top blowing air pipe, the top blowing air pipe is penetrated on the upper cover, and the end of the top blowing air pipe can extend from the top of the crucible in the quartz furnace tube to the molten pool in the crucible.

[0013] Preferably, the gas supply mechanism further comprises a bottom blowing gas pipe, and the end of the bottom blowing gas pipe can extend from the bottom of the crucible in the quartz furnace tube to the molten pool in the crucible.

[0014] Preferably, the quartz furnace tube is made of transparent material.

[0015] Preferably, the temperature control mechanism further includes a second thermocouple, the sensing end of the second thermocouple is fixedly arranged at the bottom of the crucible in the quartz furnace tube, and the controller is communicatively connected with the second thermocouple and the electromagnetic induction coil.

[0016] The present invention also provides a method for using the electromagnetic induction heating device according to any one of the above, comprising the following steps:

[0017] S1, loading raw materials into the crucible of the crucible containing mechanism;

[0018] S2, evacuating the interior of the quartz furnace tube to a vacuum state by the vacuum pumping mechanism;

[0019] S3, creating a gas atmosphere in the quartz furnace tube through the gas supply mechanism;

[0020] S4, setting the target temperature through the temperature control mechanism, and performing subsequent related processing after the molten pool temperature reaches stability.

[0021] Compared with the prior art, the present invention has achieved the following technical effects:

[0022] The electromagnetic induction heating device provided by the present invention maintains the first thermocouple with a high-temperature resistant ceramic protection tube in the temperature control mechanism in the molten pool of the crucible throughout the whole process, monitors the temperature of the molten pool in real time, and the controller automatically adjusts the power of the electromagnetic induction coil according to the sensing data of the first thermocouple and the set temperature data, so that the temperature control and temperature measurement are more accurate and stable; and the first gas supply pipe and the second gas supply pipe are connected with a mixing bottle, and the first gas supply pipe and the second gas supply pipe are provided with a flow monitoring and control device to realize flow monitoring, so that multiple gases can be mixed and introduced, and the amount of each gas introduced can be adjusted and controlled to ensure accurate monitoring of the introduced gas; the vacuum mechanism can realize the air inside the quartz furnace tube, ensure the purity of the internal gas, and realize the low-pressure environment requirement.

[0023] Furthermore, the quenching barrel arranged below the base can realize rapid quenching treatment of the sample in the crucible.

[0024] Furthermore, the first lifting mechanism can drive the base to rise and fall relative to the quartz furnace tube. When it drops to a certain height, the experimenter can directly replace the crucible and other equipment and furnace charges used for steelmaking. This is different from traditional resistance furnaces and induction furnaces that need to wait for complete cooling before replacing the charge. This greatly shortens the waiting time between different furnaces and greatly improves the experimental efficiency.

[0025] Furthermore, the electromagnetic induction coil can be moved in a high or low position relative to the quartz furnace tube by the second lifting mechanism, thereby being suitable for adjusting the relative position between the electromagnetic induction coil and the crucible inside the quartz furnace tube, thereby improving the applicability of different crucibles.

[0026] Furthermore, the provision of a gas deoxygenation device can deoxygenate non-oxygen gases, thereby ensuring the purity of the incoming gas and improving the experimental accuracy.

[0027] Furthermore, the provision of a top-blowing gas pipe enables direct gas blowing onto the surface or interior of the molten pool in the crucible, thereby increasing the feasible conditions for top-blowing gas for the experiment and being suitable for different experimental needs; for example, a large flow of inert gas can be blown into the surface of the molten metal pool or the molten metal pool covered with slag through the top-blowing gas pipe to achieve rapid cooling and solidification.

[0028] Furthermore, the bottom blowing gas pipe can realize the experimental condition of blowing gas from the bottom of the crucible, which provides feasible conditions for the bottom blowing in the crucible and is suitable for experimental needs.

[0029] Furthermore, the quartz furnace tube is made of transparent material, which allows the situation inside the furnace to be observed without opening the furnace, thereby achieving visibility of the experimental process.

[0030] Furthermore, for high-temperature experiments involving slag, the first thermocouple in the crucible is inconvenient to use. At this time, the temperature of the crucible can be monitored in real time by a second thermocouple arranged at the bottom of the crucible, thereby providing a basis for setting the temperature in the crucible, wherein the temperature difference between the molten pool and the bottom of the crucible can be determined by repeated calibration.

[0031] The method for using the electromagnetic induction heating device provided by the present invention can complete experiments such as alloy melt nitriding or slag steel desulfurization by setting relevant experimental conditions according to different experimental needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1This is a schematic diagram of the overall structure of the electromagnetic induction heating device provided by the present invention.

[0034] In the figure:

[0035] 100-Electromagnetic induction heating device;

[0036] 1-fixed frame; 2-quartz furnace tube; 3-upper cover; 4-base; 5-first thermocouple; 6-electromagnetic induction coil; 7-first gas supply pipe; 8-second gas supply pipe; 9-mixing bottle; 10-third gas supply pipe; 11-vacuum pump; 12-connecting pipe; 13-quenching barrel; 14-gas deoxidation device; 15-gas drying device; 16-top blowing pipe; 17-bottom blowing pipe; 18-electronic pressure gauge; 19-second thermocouple; 20-mounting plate; 21-feeding port; 22-observation port; 23-feeding port; 24-hand crank; 25-linking mechanism; 26-intelligent control cabinet; 27-electronic mass flowmeter; 28-tempered glass protective plate. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The object of the present invention is to provide an electromagnetic induction heating device and a method of using the same, so as to solve the problems existing in the prior art, to stably and accurately realize temperature control and temperature measurement, and to realize accurate monitoring of the introduced gas.

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Embodiment 1

[0041] This embodiment provides an electromagnetic induction heating device 100, which is mainly used, but not limited to, for high temperature experiments such as steelmaking and slag in laboratories. Figure 1As shown, it includes a crucible holding mechanism, a temperature control mechanism, a gas supply mechanism and a vacuum mechanism; the crucible holding mechanism includes a fixing frame 1, a quartz furnace tube 2, an upper cover 3 and a base 4; the quartz furnace tube 2 is fixedly arranged on the fixing frame 1; the quartz furnace tube 2 has a through channel, the upper end opening of the through channel can be closed by the upper cover 3, and the lower end opening of the through channel can be closed by the base 4; the base 4 is used to place the crucible; the temperature control mechanism includes a controller, a first thermocouple 5 and an electromagnetic induction coil 6; the electromagnetic induction coil 6 is used to be sleeved on the quartz furnace tube 2, and the electromagnetic induction coil 6 can perform electromagnetic induction heating on the crucible located in the quartz furnace tube 2 after being energized; a high-temperature resistant ceramic protection tube is sleeved on the outer side of the first thermocouple 5, and the first thermocouple 5 is used to be inserted into the molten pool in the crucible located in the quartz furnace tube 2 ... the first thermocouple 5 is sleeved The controller is communicatively connected with the first thermocouple 5 and the electromagnetic induction coil 6, and the controller can adjust the power of the electromagnetic induction coil 6; the gas supply mechanism includes a first gas supply pipe 7, a second gas supply pipe 8 and a mixing bottle 9; the ends of the first gas supply pipe 7 and the second gas supply pipe 8 can be connected to the inside of the mixing bottle 9; the output port of the mixing bottle 9 is connected to the third gas supply pipe 10, and the output port of the third gas supply pipe 10 is used to communicate with the through channel of the quartz furnace tube 2; the first gas supply pipe 7 and the second gas supply pipe 8 are both provided with a flow monitoring and control device; the flow monitoring and control device can adjust the flow and monitor the flow data; the vacuum pump mechanism includes a vacuum pump 11 and a connecting pipe 12; the suction port of the vacuum pump 11 is connected and connected to one end of the connecting pipe 12, and the other end of the connecting pipe 12 is connected to the through channel of the quartz furnace tube 2.

[0042] Through the first thermocouple 5 with a high-temperature resistant ceramic protection tube in the temperature control mechanism, it is kept in the molten pool of the crucible throughout the whole process, and the molten pool temperature is monitored in real time. The controller automatically adjusts the power of the electromagnetic induction coil 6 according to the sensing data of the first thermocouple 5 and the set temperature data, so that its temperature control and temperature measurement are more accurate and stable; and the first gas supply pipe 7 and the second gas supply pipe 8 are connected to the mixing bottle 9, and the first gas supply pipe 7 and the second gas supply pipe 8 are provided with a flow monitoring and control device to realize flow monitoring and control, so that multiple gases can be mixed and introduced, and the amount of each gas introduced can be adjusted and controlled to ensure accurate monitoring of the introduced gas; the vacuum mechanism can realize the air inside the quartz furnace tube 2, ensure the internal gas purity, and meet the low-pressure environment requirements.

[0043] Specifically, when the temperature approaches the preset value, the controller of the temperature control mechanism can automatically identify the difference between the target temperature and the actual temperature, and automatically adjust the output power of the electromagnetic induction coil 6 according to the size of the difference to stably control the temperature at the set value.

[0044] Among them, for the crucible holding mechanism:

[0045] Specifically, a mounting plate 20 is provided on the fixing frame 1 , and the upper cover 3 and the upper end of the quartz furnace tube 2 are fixed on the mounting plate 20 ; the upper end of the quartz furnace tube 2 is detachably fixed on the mounting plate 20 .

[0046] Specifically, the upper cover 3 may be provided with, as required, including but not limited to, a feed port 21, an observation port 22, and a material removal port 23, etc. Specifically, the above-provided openings may be closed to ensure the closed environment conditions required for the experiment.

[0047] Specifically, during the experiment, ingredients can be added through the feeding port 21 on the top by using molybdenum wire suspension or glass tube introduction to adjust the composition of the experimental charge, thereby significantly improving the flexibility and efficiency of the experiment.

[0048] Specifically, when sampling, a 4 mm / 6 mm glass tube can be inserted into the molten steel through the material taking port 23 to extract the sample.

[0049] Specifically, a mounting hole is provided on the upper cover 3, and the first thermocouple 5 is sealed and plugged and fixed in the mounting hole.

[0050] In the optional scheme of this embodiment, it is more preferred that the quartz furnace tube 2 is made of transparent material, so that the situation inside the furnace can be observed without opening the furnace, thus realizing the visibility of the experimental process.

[0051] Specifically, the crucible is made of a material that can receive electromagnetic induction and generate heat, and the number of crucibles is not limited, but at least one crucible can receive electromagnetic induction and generate heat. For example, three crucibles can be placed in the quartz furnace tube 2, namely a protective crucible, a graphite crucible and an experimental crucible; the experimental crucible is placed in the graphite crucible, and the graphite crucible is placed in the protective crucible; the protective crucible and the experimental crucible will not be heated by electromagnetic induction, but the graphite crucible can generate heat by receiving electromagnetic induction; the protective crucible can protect the internal molten pool liquid from being retained and the graphite crucible from being heat-insulated. The graphite crucible is used to receive electromagnetic induction heat and heat and keep the experimental crucible warm, and the experimental crucible is used to hold samples.

[0052] Specifically, refractory bricks are placed under the crucible (or the outermost crucible) to separate the crucible from the base 4 , and the refractory bricks have a heat-insulating effect on the base 4 .

[0053] Specifically, the fixing frame 1 includes an upper frame and a lower frame, the upper frame is located above the lower frame, the mounting plate 20 is fixed on the upper frame, and the quenching barrel 13 is placed in the lower frame.

[0054] Specifically, the upper frame and the lower frame may be made of alloy material.

[0055] Among the optional solutions of this embodiment, it is more preferred that Figure 1As shown, the base 4 is fixedly arranged at the output end of the first lifting mechanism, and the output end of the first lifting mechanism can drive the base 4 to rise and fall along the axial direction of the quartz furnace tube 2. The first lifting mechanism can drive the base 4 to rise and fall relative to the quartz furnace tube 2. When it drops to a certain height, the experimenter can conveniently and directly replace the crucible and other equipment and furnace materials used for steelmaking, which is different from the traditional resistance furnace and induction furnace, which need to wait for complete cooling before replacing the furnace materials. The waiting time between different furnaces is greatly shortened, and the experimental efficiency is greatly improved.

[0056] Specifically, the first lifting mechanism is an existing device that can drive the base 4 to rise and fall, including but not limited to the following structural settings. For example, a nut is welded on the side wall of the base 4, and a threaded rod is inserted into the nut. The threaded rod can rotate on its own, and the cooperation between the rotating threaded rod and the nut realizes the lifting and lowering action of the base 4; a hand-cranked wheel 24 can also be provided, and the hand-cranked wheel 24 drives the threaded rod to rotate on its own through a linkage mechanism 25, and the experimenter rotates the threaded rod by turning the hand-cranked wheel 24.

[0057] Among them, for the temperature control mechanism:

[0058] Among the optional solutions of this embodiment, it is more preferred that Figure 1 As shown, the electromagnetic induction coil 6 is fixedly arranged at the output end of the second lifting mechanism, and the output end of the second lifting mechanism can drive the electromagnetic induction coil 6 to rise and fall along the axial direction of the quartz furnace tube 2. The electromagnetic induction coil 6 can be moved in a high and low position relative to the quartz furnace tube 2 by the second lifting mechanism, so as to adjust the relative position between the electromagnetic induction coil 6 and the crucible inside the quartz furnace tube 2, thereby improving the applicability of different crucibles.

[0059] Among the optional solutions of this embodiment, it is more preferred that Figure 1 As shown, the temperature control mechanism also includes a second thermocouple 19, the sensing end of the second thermocouple 19 is fixedly arranged at the bottom of the crucible in the quartz furnace tube 2, and the controller is in communication connection with the second thermocouple 19 and the electromagnetic induction coil 6. For high-temperature experiments involving slag, the first thermocouple 5 in the crucible is inconvenient to use. At this time, the temperature of the crucible can be monitored in real time by the second thermocouple 19 arranged at the bottom of the crucible, thereby providing a basis for the temperature set in the crucible, wherein the temperature difference between the molten pool and the bottom of the crucible can be determined by repeated calibration.

[0060] Specifically, the temperature control mechanism also includes an intelligent control cabinet 26. Each electronic control component can be installed in the intelligent control cabinet 26. A touch screen can be set in the intelligent control cabinet 26. The experiment operator can set necessary experimental conditions through the touch screen, including but not limited to the heating temperature in the crucible.

[0061] Specifically, the controller is also connected to communicate with electronic components including but not limited to the electronic mass flow meter 27 on the bottom blowing air pipe 17, so as to improve the level of intelligent control.

[0062] Specifically, the opening and closing door of the base 4 can be set to a structure that can be opened and closed automatically, which is connected to the controller to facilitate the opening and closing action of the opening and closing door to be controlled by the controller.

[0063] Specifically, the temperature control mechanism may adopt a PID temperature control system.

[0064] Among them, for the gas supply mechanism:

[0065] Specifically, the flow monitoring and control device is an existing device, that is, it can realize data monitoring and control of gas flow in the first gas supply pipe 7, the second gas supply pipe 8 and the bottom blowing gas pipe 17; for data monitoring of gas flow, for example, an electronic mass flow meter.

[0066] Among the optional solutions of this embodiment, it is more preferred that Figure 1 As shown, the front ends of the first gas supply pipe 7 and the second gas supply pipe 8 are connected with a gas deoxidation device 14. The gas deoxidation device 14 can deoxidize non-oxygen gases, ensure the purity of the introduced gas, and improve the experimental accuracy.

[0067] Among the optional solutions of this embodiment, it is more preferred that Figure 1 As shown, along the gas delivery direction, the front end and / or rear end of the gas deoxidation device 14 is connected to a gas drying device 15. The gas drying device 15 can dry the incoming gas, thereby reducing the influence of moisture mixed in the incoming gas on the experiment and improving the experimental accuracy.

[0068] Specifically, the number of gas drying devices 15 can be set according to actual needs, and the gas deoxygenation device 14 and the gas drying device 15 are existing equipment. For example, the gas deoxygenation device 14 is a device with a heated copper mesh inside, and oxygen is removed from the gas after passing through the heated copper mesh.

[0069] Among the optional solutions of this embodiment, it is more preferred that Figure 1 As shown, the gas supply mechanism also includes a top blowing gas pipe 16, which is provided on the upper cover 3, and the end of the top blowing gas pipe 16 can extend from the top of the crucible in the quartz furnace tube 2 to the molten pool in the crucible. The provision of the top blowing gas pipe 16 can realize direct gas injection on the surface or inside of the molten pool in the crucible, increase the feasible conditions of top blowing gas for the experiment, and meet different experimental needs; for example, a large flow of inert gas can be blown into the metal molten pool or the surface of the metal molten pool covered with slag through the top blowing gas pipe 16 to achieve rapid cooling and solidification.

[0070] Specifically, in order to reasonably arrange the pipelines for the circulation of each gas, the input end of the top blowing air pipe 16 can be connected to the branch of the first air supply pipe 7. At this time, the gas sprayed by the top blowing air pipe 16 and the mixed gas supplied by the first air supply pipe 7 and the second air supply pipe 8 are staggered, that is, they are not used at the same time, and the top blowing air pipe 16 and the pipeline connecting the first air supply pipe 7 to the mixing bottle 9 can be provided with opening and closing valves.

[0071] Among the optional solutions of this embodiment, it is more preferred that Figure 1 As shown, the gas supply mechanism also includes a bottom blowing gas pipe 17, and the end of the bottom blowing gas pipe 17 can extend from the bottom of the crucible in the quartz furnace tube 2 to the molten pool in the crucible. The bottom blowing gas pipe 17 can realize the experimental condition of blowing gas from the bottom of the crucible, which provides feasible conditions for blowing at the bottom of the crucible, suitable for experimental needs.

[0072] Specifically, an electronic mass flow meter 27 is provided on the bottom blowing air pipe 17 .

[0073] Specifically, the conveying front end of the bottom blowing gas pipe 17 and the conveying front ends of the first gas supply pipe 7 and the second gas supply pipe 8 can all be connected to the same gas deoxygenation device 14 .

[0074] Specifically, the quartz furnace tube 2 is connected with four gas paths: the first gas supply pipe 7 and the second gas supply pipe 8 are merged into the same pipe before entering the gas mixing bottle 9, and then the gases are passed into the gas mixing bottle 9 through the pipes. Gases of determined flow rates are respectively passed into the first gas supply pipe 7 and the second gas supply pipe 8, and are blown into the top of the quartz furnace tube 2 through the third gas supply pipe 10, so as to realize accurate control of the atmosphere and partial pressure in the quartz furnace tube 2; the bottom blowing pipe 17 passes through the base 4 and the refractory bricks at the bottom of the quartz furnace tube 2 and is connected to the crucible with a gas permeable plug at the bottom, and gas is blown into the molten pool in the crucible; the gas path branched off from the first gas supply pipe 7 blows gas into the surface or the inside of the molten pool through the top blowing pipe 16; each gas path is equipped with an electronic mass flowmeter 27 and an independent switch (such as an openable and closable valve), and is matched with a vacuum pumping mechanism to remove the air inside the quartz furnace tube 2 and reduce the pressure to 0.2 Pa to meet the requirements of a low-pressure environment.

[0075] Specifically, the above introduced gases can be selected according to experimental needs.

[0076] Specifically, each gas path is provided with an independent electronic mass flow meter 27 to adjust the gas ratio to meet the requirements of the atmosphere control experiment.

[0077] Among them, for the vacuum pumping mechanism:

[0078] Specifically, in order to reduce the length of the connecting pipe, the connecting pipe 12 can be connected to the third gas supply pipe 10. At this time, a valve that can be opened and closed can be set on the connecting pipe 12, that is, the pipeline between the third gas supply pipe 10 and the gas mixing bottle 9.

[0079] Among the optional solutions of this embodiment, it is more preferred that Figure 1 As shown, an electronic pressure gauge 18 is provided on the connecting pipe 12. The electronic pressure gauge 18 can display the internal air pressure of the quartz crucible, thereby ensuring whether the vacuum conditions achieved by the vacuum pumping mechanism meet the experimental requirements.

[0080] Specifically, the electronic pressure gauge 18 can detect the pressure inside the quartz furnace tube 2 in real time.

[0081] Among them, for the quenching treatment of the sample in the crucible:

[0082] Among the optional solutions of this embodiment, it is more preferred that Figure 1 As shown, a quenching barrel 13 is provided below the base 4, and a quenching medium is contained in the quenching barrel 13; a drop hole is provided on the base 4, and an opening and closing door is provided on the drop hole, and the opening and closing door can block or open the drop hole; the crucible in the quartz furnace tube 2 can fall into the quenching barrel 13 through the drop hole. The quenching barrel 13 provided below the base 4 can realize rapid quenching treatment of the sample in the crucible.

[0083] Specifically, the sample can be water quenched or oil quenched; specifically, when it is water quenched or oil quenched, the upper opening of the quenching barrel 13 can be connected to the drop hole of the base 4 through a connecting pipe, and when the crucible or sample falls into the quenching barrel 13, the opening and closing door at the drop hole is closed.

[0084] Specifically, under the premise of cutting off the power supply of the electromagnetic induction coil 6, a large flow of gas can be blown into the surface of the slag metal through the top blowing air pipe 16 to achieve rapid cooling and solidification.

[0085] Among them, regarding other related instructions:

[0086] Specifically, the quartz furnace tube 2 is sealed simply and reliably, ensuring the stability of the internal atmosphere during use.

[0087] Specifically, the base 4 is provided with an air outlet pipe, and the air outlet pipe is provided with a necessary air outlet switch.

[0088] Specifically, multiple gas circuits are provided, wherein the first gas supply pipe 7 and the second gas supply pipe 8 are matched with a gas mixing bottle 9, so that the pressure of the gas can be distributed (two different gases are introduced into the gas mixing bottle 9 in a specific ratio and then into the quartz furnace tube 2).

[0089] Specifically, the third gas supply pipe 10 is provided with an opening and closing valve, so as to ensure that the electronic pressure gauge 18 can monitor the pressure in the quartz furnace tube 2 in real time.

[0090] Specifically, by using a transparent quartz furnace tube 2 to replace a traditional corundum furnace tube, the condition of the internal steel can be directly observed.

[0091] Specifically, it can realize multiple functions such as water quenching / oil quenching / gas quenching, vacuum, top blowing, bottom blowing, rapid melting, etc., which can meet most experimental needs; the temperature and atmosphere can be accurately monitored and multi-functionally realized, which is different from the single function of traditional resistance furnaces and induction furnaces. The electromagnetic induction heating device 100 of this embodiment can significantly improve the experimental accuracy and efficiency and meet more complex high-temperature experimental needs.

[0092] Specifically, a tempered glass protection plate 28 may be provided around the outer side of the quartz furnace tube 2 to increase the protection effect.

[0093] Embodiment 2

[0094] This embodiment provides a method for using the electromagnetic induction heating device based on the first embodiment, comprising the following steps:

[0095] S1, loading raw materials into a crucible of a crucible holding mechanism;

[0096] S2, evacuating the interior of the quartz furnace tube 2 to a vacuum state through a vacuum pumping mechanism;

[0097] S3, creating a gas atmosphere in the quartz furnace tube 2 through a gas supply mechanism;

[0098] S4, setting the target temperature through the temperature control mechanism, and carrying out subsequent related processing after the molten pool temperature reaches stability.

[0099] By setting the relevant experimental conditions according to different experimental needs, related experiments such as alloy melt nitriding or slag steel desulfurization can be completed.

[0100] The following is a detailed description of the Fe-Cr alloy melt nitriding experiment and slag steel desulfurization experiment at 1600℃:

[0101] 1. Nitriding experiment of Fe-Cr alloy melt at 1600℃:

[0102] The implementation steps include the following:

[0103] ① Loading the furnace: Put 400g of pure Fe rod and 100g of metal Cr into the corundum crucible, and then place the crucible in the middle of the refractory brick on the base 4; pass the quartz furnace tube 2 through the crucible and carefully place it back into the base, use the hand-cranked wheel 24 to slowly raise the quartz furnace tube 2 and the crucible together and push them into the sealing ring in the upper cover 3, and use the lifting button on the intelligent control cabinet 26 to raise the electromagnetic induction coil 6 to the position just covering the crucible to complete the furnace loading operation.

[0104] ② Thermocouple connection and installation: insert the first thermocouple 5 through the installation hole on the upper cover 3 into the upper part of the alloy material in the quartz furnace tube 2, fix the thermocouple 5 by tightening the metal hole cover with holes, and then connect the plug and socket of the thermocouple above the furnace.

[0105] ③ Vacuuming and ventilation: connect the vacuum pump 11 to the furnace body through the connecting pipe 12, close all the gas supply pipes (7, 8, 10, 16) and the gas outlet pipe switches, start the vacuum pump 11 to extract the gas in the furnace tube 2 until the reading of the electronic pressure gauge 18 no longer decreases; successively open the heating switch of the deoxidation device 14 (the set temperature is 400°C) and the air inlet valve of the second gas supply pipe 8 (Ar), adjust the flow knob of the second gas supply pipe 8 to set the flow rate to 2L / min (displayed on the electronic flow meter 27), until the reading of the electronic pressure gauge 18 rises to 0 (that is, the pressure in the furnace is 1atm), open the gas outlet switch on the furnace base 4, and allow high-purity Ar to flow continuously through the furnace tube.

[0106] ④ Set heating parameters and turn on the cooling water switch: adjust the induction coil power knob on the intelligent control cabinet 26 to the minimum, and switch it to the "manual" heating mode, set the target temperature to 1600℃, and then turn on the cooling water switch flowing through the induction coil, power cabinet, and furnace top base.

[0107] ⑤ Heating: Turn on the start switch of the electromagnetic induction coil 6, and increase the induction power intermittently in a small range during the heating period. When the charge begins to melt, the charge gradually moves downward and the position of the first thermocouple 5 is manually lowered to ensure that the lower end of the thermocouple is close to the charge, so that the temperature displayed by the thermocouple is as close as possible to the actual temperature of the charge.

[0108] ⑥ Automatic temperature control: When the charge is melted, insert the first thermocouple 5 into the crucible molten pool. When the molten pool temperature is within 50°C of the target temperature, change the "manual" heating mode to the "automatic" temperature control mode until the molten pool temperature is stably maintained at (1600±0.5)°C.

[0109] ⑦ Gas phase nitriding and sampling analysis: Open the air inlet valve of the first gas supply pipe 7 (N2), adjust N2 and Ar to the flow rates listed in Table 1, and after nitriding at constant temperature for 60 minutes at each group of gas flow rates, quickly sample from the observation hole 22 through a Φ6 quartz tube connected to a syringe and quickly quench with water. After the sample surface is polished and cleaned, it is sent to nitrogen and oxygen analysis, and then the N2 and Ar gas flow rates are adjusted to start the next group of nitriding experiments until all groups of experiments are completed. The analysis results of N and O content of each sample are listed in Table 1.

[0110] Table 1 Experimental conditions and results of nitriding of Fe-20%Cr liquid alloy

[0111]

[0112]

[0113] ⑧End the experiment: turn off all power and gas valves of the furnace, and then turn off the furnace cooling water after 30 minutes to end the experiment.

[0114] 2. Slag steel desulfurization experiment:

[0115] The implementation steps include the following:

[0116] ① Metal material charging: 500g of prefabricated sulfur-containing steel (the composition is listed in Table 2) is loaded into the corundum crucible, and then the crucible is placed in the middle of the refractory brick with holes on the base 4; the quartz furnace tube 2 is passed through the crucible filled with raw materials and carefully placed back into the sealing coil of the base 4, and the quartz furnace tube 2 and the crucible are slowly raised together by the hand-cranked wheel 24 and pushed into the sealing ring in the upper cover 3, and the electromagnetic induction coil 6 is raised to the position just covering the crucible through the lifting button on the intelligent control cabinet 26 to complete the furnace loading operation.

[0117] ② Thermocouple connection and installation: insert the bottom of the second thermocouple 19 through the small hole below the base 4, and pass through the refractory brick with holes until the thermocouple just touches the bottom of the crucible, fix the first thermocouple with the fixing device below the base, and insert the thermocouple plug into the socket. Insert the first thermocouple 5 through the mounting hole of the upper cover 3 above the metal material in the crucible, fix the first thermocouple 5 by tightening the metal hole cover with holes, and connect it to the thermocouple socket.

[0118] ③ Vacuuming and ventilation: connect the vacuum pump 11 to the furnace body through the connecting pipe 12, close all the gas supply pipes (7, 8, 10, 16) and the gas outlet pipe switches, start the vacuum pump 11 to extract the gas in the furnace tube 2 until the reading of the electronic pressure gauge 18 no longer decreases; successively open the heating switch of the deoxidation device 14 (the set temperature is 400°C) and the air inlet valve of the second gas supply pipe 8 (Ar), adjust the flow knob of the second gas supply pipe 8 to set the flow rate to 2L / min (displayed on the electronic flow meter 27), until the reading of the electronic pressure gauge 18 rises to 0 (that is, the pressure in the furnace is 1atm), open the gas outlet switch on the furnace base 4, and allow high-purity Ar to flow continuously through the furnace tube.

[0119] ④ Set heating parameters and turn on the cooling water switch: adjust the induction coil power knob on the intelligent control cabinet 26 to the minimum, and turn it to the "manual" heating mode, and then turn on the cooling water switch flowing through the induction coil, power cabinet, and furnace top base.

[0120] ⑤ Heating and heating: Turn on the start switch of the electromagnetic induction coil 6, increase the induction power intermittently in a small range during the heating period, and while the charge is melting and gradually moving downward, manually lower the position of the first thermocouple 5 to ensure that the lower end of the thermocouple is always close to the charge, so that the temperature displayed by the thermocouple is as close as possible to the actual temperature of the charge.

[0121] ⑥ Automatic temperature control: When the charge is melted, insert the first thermocouple 5 into the crucible molten pool to measure the temperature, record it as T1, and record the temperature T2 corresponding to the second thermocouple 19, and then set the target temperature of the second thermocouple 19 under the base to (1620-T1+T2)℃. When the temperature T2 of the second thermocouple is within 50℃ of the target temperature, change the "manual" heating mode to the "automatic" temperature control mode until the temperature displayed by the second thermocouple 19 is stably maintained at (1620-T1+T2±0.5)℃.

[0122] ⑦ Deoxidation and prefabricated slag desulfurization: 0.325g pure Al particles were added to the molten steel through a Φ12×50 quartz tube, and samples were taken after 10 minutes. Then 25g of prefabricated slag wrapped in iron foil (composition: 65% CaO-35% CaF2) was also added to the molten steel for slag steel desulfurization experiment. After adding, the sealing cover was quickly covered, and samples were taken after 120 minutes. The chemical analysis results of the deoxidized and desulfurized samples and the prefabricated sulfur-containing steel are listed in Table 2.

[0123] Table 2 Analysis results of sulfur-containing steel deoxidation and desulfurization experimental samples

[0124] Steel Sample\Element C Mn P S Si O Al Ca Fe Sulphur steel 0.04 0.0200 0.0040 0.010 0.0020 0.060 0.0005 -- margin Deoxidized steel 0.04 0.0197 0.0042 0.010 0.0023 0.0038 0.0018 -- margin Desulfurized steel 0.04 0.0198 0.0043 0.0006 0.0018 0.0035 0.0031 0.0006 margin

[0125] ⑧End the experiment: turn off all power and gas valves of the furnace, and then turn off the furnace cooling water after 30 minutes to end the experiment.

[0126] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An electromagnetic induction heating device, characterized in that: It includes a crucible containing mechanism, a temperature control mechanism, a gas supply mechanism and a vacuum pumping mechanism; The crucible holding mechanism comprises a fixing frame, a quartz furnace tube, an upper cover and a base; the quartz furnace tube is fixedly arranged on the fixing frame; the quartz furnace tube has a through passage, the upper end opening of the through passage can be closed by the upper cover, and the lower end opening of the through passage can be closed by the base; the base is used to place the crucible; The temperature control mechanism includes a controller, a first thermocouple and an electromagnetic induction coil; the electromagnetic induction coil is used to be sleeved on the quartz furnace tube, and the electromagnetic induction coil can perform electromagnetic induction heating on the crucible in the quartz furnace tube after being energized; a high-temperature resistant ceramic protection tube is sleeved on the outer side of the first thermocouple, and the first thermocouple is used to be inserted into the molten pool in the crucible in the quartz furnace tube; the controller is communicatively connected with the first thermocouple and the electromagnetic induction coil, and the controller can adjust the power of the electromagnetic induction coil; The gas supply mechanism includes a first gas supply pipe, a second gas supply pipe and a gas mixing bottle; the ends of the first gas supply pipe and the second gas supply pipe can be connected to the inside of the gas mixing bottle; the output port of the gas mixing bottle is connected to a third gas supply pipe, and the output port of the third gas supply pipe is used to communicate with the through channel of the quartz furnace tube; the first gas supply pipe and the second gas supply pipe are both provided with a flow monitoring and control device; the flow monitoring and control device can adjust the flow and monitor the flow data; The vacuum pumping mechanism includes a vacuum pump and a connecting pipe; the suction port of the vacuum pump is connected and communicated with one end of the connecting pipe, and the other end of the connecting pipe is communicated with the through channel of the quartz furnace tube.

2. The electromagnetic induction heating device according to claim 1, characterized in that: A quenching barrel is provided below the base, and a quenching medium is contained in the quenching barrel; A drop hole is provided on the base, and an opening and closing door is provided on the drop hole, and the opening and closing door can block or open the drop hole; The crucible in the quartz furnace tube can fall into the quenching barrel through the drop hole.

3. The electromagnetic induction heating device according to claim 1, characterized in that: The base is fixedly arranged at the output end of the first lifting mechanism, and the output end of the first lifting mechanism can drive the base to rise and fall along the axial direction of the quartz furnace tube.

4. The electromagnetic induction heating device according to claim 1, characterized in that: The electromagnetic induction coil is fixedly arranged at the output end of the second lifting mechanism, and the output end of the second lifting mechanism can drive the electromagnetic induction coil to rise and fall along the axial direction of the quartz furnace tube.

5. The electromagnetic induction heating device according to claim 1, characterized in that: The conveying front ends of the first gas supply pipe and the second gas supply pipe are connected with a gas deoxygenation device.

6. The electromagnetic induction heating device according to claim 1, characterized in that: The gas supply mechanism further comprises a top blowing gas pipe, which is penetrated on the upper cover, and the end of which can extend from the top of the crucible in the quartz furnace tube to the molten pool in the crucible.

7. The electromagnetic induction heating device according to claim 1, characterized in that: The gas supply mechanism further comprises a bottom blowing gas pipe, the end of which can extend from the bottom of the crucible in the quartz furnace tube to the molten pool in the crucible.

8. The electromagnetic induction heating device according to claim 1, characterized in that: The quartz furnace tube is made of transparent material.

9. The electromagnetic induction heating device according to claim 1, characterized in that: The temperature control mechanism further includes a second thermocouple, the sensing end of the second thermocouple is fixedly arranged at the bottom of the crucible in the quartz furnace tube, and the controller is communicatively connected with the second thermocouple and the electromagnetic induction coil.

10. A method for using the electromagnetic induction heating device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, loading raw materials into the crucible of the crucible containing mechanism; S2, evacuating the interior of the quartz furnace tube to a vacuum state by the vacuum pumping mechanism; S3, creating a gas atmosphere in the quartz furnace tube through the gas supply mechanism; S4, setting the target temperature through the temperature control mechanism, and performing subsequent related processing after the molten pool temperature reaches stability.

Images