A casting iron furnace head smelting temperature control device

Abstract

This utility model relates to the field of cast iron smelting technology, specifically to a temperature control device for cast iron furnace head smelting. It includes a crucible made of refractory material, a lid covering the top of the crucible, a heat insulation plate below the crucible, an induction coil wound around the periphery of the crucible along its height, and a microprocessor. Multiple inwardly recessed heating grooves are evenly spaced on the lower surface of the crucible. Multiple perforations are formed on the surface of the heat insulation plate facing the crucible, with the positions of the perforations corresponding to the positions of the heating grooves. An installation chamber communicating with all the perforations is provided inside the heat insulation plate. An installation plate is installed within the installation chamber, and multiple heating blocks with heating functions are arranged on the surface of the installation plate facing the crucible. The positions of the heating blocks correspond to the positions of the perforations, and the heating blocks are located within the perforations and extend towards the corresponding heating grooves. A temperature sensor is provided on the top of the lid. The temperature sensor and the heating blocks are electrically connected to the microprocessor.

Description

Technical Field

[0001] This utility model relates to the field of cast iron smelting technology, specifically to a cast iron furnace head smelting temperature control device. Background Technology

[0002] Cast iron furnace heads are key components in industrial heating equipment, and they utilize various heating methods, such as gas heating, resistance heating, induction heating, and fuel oil heating. Different methods are suitable for different scenarios and needs. Among them, induction heating works by using an alternating current to generate an alternating magnetic field through an induction coil. Eddy currents are generated in the conductive material within the magnetic field, and the Joule heating of these eddy currents causes the conductive material to heat up on its own. This method offers high heating efficiency, fast speed, and precise temperature control.

[0003] The existing electromagnetic cast iron furnace head has the following structure: the innermost layer is a crucible made of refractory material, the bottom of the crucible is equipped with a heat insulation layer, an induction coil is wound around the perimeter of the crucible, and an iron core is placed outside the induction coil. With this structure, when an alternating current is passed through the induction coil, an alternating magnetic field is generated, and the iron core enhances the magnetic field strength. When the metal to be melted (such as iron or other conductive metals) is put into the crucible, the metal cuts the magnetic field lines and generates eddy currents, thereby heating the metal itself and achieving the melting process.

[0004] However, because the magnetic field strength at the bottom of the crucible is much lower than that on the periphery, a cold zone is generated at the bottom of the crucible cavity. This results in insufficient heating of the metal material at the bottom of the crucible cavity. The specific reasons are as follows: the induction coil only surrounds the periphery of the crucible, and the iron core placed outside the induction coil further confines the magnetic field to the periphery. Due to the lack of a magnetic field guiding or reinforcing structure at the bottom of the crucible, the magnetic field strength at the bottom is weaker than that on the periphery. This difference in magnetic field distribution results in weaker eddy currents generated in the metal material at the bottom of the crucible cavity, leading to less heat generation in the metal material at the bottom than in the metal material on the periphery, thus causing insufficient heating of the metal material at the bottom of the crucible cavity.

[0005] Therefore, there is an urgent need to design a casting iron furnace head melting temperature control device to solve the technical problem of insufficient heating of metal materials located at the bottom of the crucible cavity in the existing technology. Utility Model Content

[0006] The present invention aims to provide a temperature control device for smelting cast iron furnace head, so as to solve the technical problem of insufficient heating of metal materials located at the bottom of the crucible cavity in the prior art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] 1) A casting iron furnace head smelting temperature control device, comprising a crucible made of refractory material, a cover covering the top of the crucible, a heat insulation plate disposed below the crucible, an induction coil wound around the periphery of the crucible along its height direction, and a microprocessor. Multiple inwardly recessed heating grooves are evenly spaced on the lower surface of the crucible. Multiple perforations are formed on the surface of the heat insulation plate facing the crucible, the positions of the perforations corresponding one-to-one with the positions of the heating grooves. An installation chamber communicating with all the perforations is disposed within the heat insulation plate. An installation plate is disposed within the installation chamber, and multiple heating blocks with heating functions are disposed on the surface of the installation plate facing the crucible. The positions of the heating blocks correspond one-to-one with the positions of the perforations, and the heating blocks are located within the perforations and extend towards the corresponding heating grooves. A temperature sensor is disposed on the top of the cover. The temperature sensor and the heating blocks are electrically connected to the microprocessor.

[0009] First, the metal material to be melted is placed into the crucible, and the lid is closed after the material is added. Then, an alternating current is passed through the induction coil, which generates a circumferential alternating magnetic field. The metal material placed in the crucible cuts the magnetic field lines, generating eddy currents, which in turn heat up and begin melting. A temperature sensor located on the top of the lid monitors the temperature in real time and transmits the data to a microprocessor. The microprocessor sets the temperature monitored by the temperature sensor as the detection value and sets a first preset value and a second preset value, where the first preset value is less than the second preset value. When the detection value is less than the first preset value, the microprocessor sends a first command to the heating block, which then heats up. The heating block transfers the heat to a heating groove located on the lower surface of the crucible, which in turn transfers the heat to other locations at the bottom of the crucible, thus conducting the heat to the metal material at the bottom of the crucible cavity, heating it and assisting in the melting process. When the detection value is higher than the second preset value, the microprocessor sends a second command to the heating block, which stops heating, preventing the temperature at the bottom of the crucible from becoming too high and affecting the melting quality of the metal material.

[0010] The heating block is embedded in the heating groove at the bottom of the crucible. It can transfer heat to the heating groove located on the lower surface of the crucible through its own heating. The heating groove then transfers the heat to other locations at the bottom of the crucible, and then conducts the heat to the metal material located at the bottom of the crucible cavity, thus heating it. This solves the technical problem of insufficient heating of the metal material at the bottom of the crucible cavity in the prior art. The heating block's compensatory heating of the bottom of the crucible is only activated when the temperature at the bottom of the crucible is insufficient. It automatically cuts off the power when the temperature is too high, thus avoiding continuous high energy consumption.

[0011] 2) A cast iron furnace head smelting temperature control device according to 1), wherein: it further includes a power supply battery, the heating block has a hollow structure, the heating block is provided with heating wires, and the heating wires in each heating block are connected in series and electrically connected to the power supply battery.

[0012] A power battery provides current to the series-connected heating wires, and a microprocessor controls the heating and stopping of all heating wires by switching the control circuit on and off. The series circuit ensures that all heating wires operate synchronously and at the same power, reduces the complexity of the power supply line, and ensures that the bottom area of ​​the crucible is heated as evenly as possible.

[0013] 3) A cast iron furnace head smelting temperature control device according to 2), wherein: the heating block is cylindrical, the inner wall of the heating block is provided with a spiral mounting groove, the heating wire is wound in the mounting groove, and the diameter of the heating wire is adapted to the width of the mounting groove.

[0014] When the heating wire heats up, it transfers heat to the side wall of the heating block, which then transfers the heat to the heating tank. The heating tank then transfers the heat to other parts of the crucible bottom, thus heating the bottom of the crucible. Because the heating wire is wound in a spiral mounting groove, it is also spiral in shape. The spiral structure of the heating wire increases the heating area and improves heat transfer efficiency.

[0015] 4) A cast iron furnace head smelting temperature control device according to 1), wherein: a heat insulation sheet is provided between the crucible and the induction coil.

[0016] During installation, an insulating sheet is wrapped around the outer wall of the crucible before the induction coil is wound. Because the insulating sheet has extremely low thermal conductivity, it forms a thermal barrier between the crucible and the induction coil, preventing heat loss from the crucible and thus improving heating efficiency. Additionally, it prevents heat from the crucible from being conducted to the coil, avoiding the failure of the induction coil's insulating varnish due to high temperatures.

[0017] 5) A cast iron furnace head smelting temperature control device according to 1), wherein: refractory bricks are provided under the edge of the crucible, the refractory bricks are arranged around the periphery of the crucible, an iron core is provided under the refractory bricks, the iron core is cylindrical, the top of the iron core is fixedly connected to the refractory bricks, the bottom of the iron core is fixedly connected to the heat insulation plate, and the iron core is located outside the induction coil.

[0018] The top of the iron core can be fixed to the refractory bricks with bolts and nuts, and the bottom of the iron core can be fixed to the heat insulation plate with bolts and nuts. The iron core can confine the magnetic field to the periphery of the crucible, thereby increasing the magnetic field strength and improving the melting efficiency.

[0019] The beneficial effects of this utility model are as follows:

[0020] First, the metal material to be melted is placed into the crucible, and the lid is closed after the material is added. Then, an alternating current is passed through the induction coil, which generates a circumferential alternating magnetic field. The metal material placed in the crucible cuts the magnetic field lines, generating eddy currents, which in turn heat up and begin melting. A temperature sensor located on the top of the lid monitors the temperature in real time and transmits the data to a microprocessor. The microprocessor sets the temperature monitored by the temperature sensor as the detection value and sets a first preset value and a second preset value, where the first preset value is less than the second preset value. When the detection value is less than the first preset value, the microprocessor sends a first command to the heating block, which then heats up. The heating block transfers the heat to a heating groove located on the lower surface of the crucible, which in turn transfers the heat to other locations at the bottom of the crucible, thus conducting the heat to the metal material at the bottom of the crucible cavity, heating it and assisting in the melting process. When the detection value is higher than the second preset value, the microprocessor sends a second command to the heating block, which stops heating, preventing the temperature at the bottom of the crucible from becoming too high and affecting the melting quality of the metal material.

[0021] The heating block is embedded in the heating groove at the bottom of the crucible. It can transfer heat to the heating groove located on the lower surface of the crucible through its own heating. The heating groove then transfers the heat to other locations at the bottom of the crucible, and then conducts the heat to the metal material located at the bottom of the crucible cavity, thus heating it. This solves the technical problem of insufficient heating of the metal material at the bottom of the crucible cavity in the prior art. The heating block's compensatory heating of the bottom of the crucible is only activated when the temperature at the bottom of the crucible is insufficient. It automatically cuts off the power when the temperature is too high, thus avoiding continuous high energy consumption. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of a cast iron furnace head smelting temperature control device according to the present invention;

[0023] Figure 2 This is a cross-sectional view of the crucible and heat insulation plate when the temperature control device for smelting cast iron furnace head according to this utility model is separated.

[0024] In the diagram: 1. Crucible; 2. Cover; 3. Insulation plate; 4. Induction coil; 5. Heating tank; 6. Mounting chamber; 7. Mounting plate; 8. Heating block; 9. Insulation sheet; 10. Refractory brick; 11. Iron core. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0030] Please see Figures 1-2 This utility model discloses a temperature control device for smelting cast iron furnace head, comprising a crucible 1 made of refractory material, a cover 2 covering the top of the crucible 1, a heat insulation plate 3 disposed below the crucible 1, an induction coil 4 wound around the periphery of the crucible 1 along its height direction, and a microprocessor. Multiple inwardly recessed heating grooves 5 are evenly spaced on the lower surface of the crucible 1. Multiple perforations are formed on the surface of the heat insulation plate 3 facing the crucible 1, with the positions of the perforations corresponding to the positions of the heating grooves 5. An installation chamber 6 communicating with all the perforations is disposed within the heat insulation plate 3. An installation plate 7 is disposed within the installation chamber 6, and multiple heating blocks 8 with heating functions are disposed on the surface of the installation plate 7 facing the crucible 1. The positions of the heating blocks 8 correspond to the positions of the perforations, and the heating blocks 8 are located within the perforations and extend towards the corresponding heating grooves 5. A temperature sensor is disposed on the top of the cover 2. The temperature sensor and the heating blocks 8 are electrically connected to the microprocessor.

[0031] The crucible 1 in this invention can be made of silicon nitride combined with silicon carbide, which is a non-magnetic ceramic that will not block the magnetic field generated by the induction coil 4. It also has high thermal conductivity, which can accelerate the transfer of heat from the bottom of the crucible 1 to the metal material inside. The heat insulation plate 3 in this invention can be made of alumina hollow spherical brick, which has high temperature resistance and can adapt to the high-temperature environment during iron smelting. It has extremely low thermal conductivity, good heat insulation effect, is lightweight, and has high compressive strength, making it suitable for load-bearing heat insulation layers in high-temperature areas. In this invention, multiple heating grooves 5 are arranged in a multi-ring array centered on the center point of the lower surface of the crucible 1. The heating grooves 5 in the same ring array are evenly spaced along the circumference, and the heating grooves 5 in adjacent ring arrays are spaced apart in the radial direction, which is beneficial for uniform heating of the bottom of the crucible 1.

[0032] The metal material to be melted is placed into crucible 1, and the lid 2 is then placed on top. An alternating current is then passed through induction coil 4, generating a circumferential alternating magnetic field. The metal material placed in crucible 1 cuts the magnetic field lines, generating eddy currents, which in turn heat up and begin melting. A temperature sensor located at the top of lid 2 monitors the temperature in real time and transmits the data to a microprocessor. The microprocessor sets the temperature monitored by the sensor as the detection value and sets a first preset value and a second preset value, where the first preset value is less than the second preset value. When the detection value is less than the first preset value, the microprocessor sends a first command to heating block 8, which then heats up. Heating block 8 transfers heat to heating groove 5 located on the lower surface of crucible 1, which in turn transfers heat to other locations at the bottom of crucible 1, thus conducting heat to the metal material at the bottom of the crucible 1's inner cavity, heating it and aiding in melting. When the detection value is higher than the second preset value, the microprocessor sends a second command to heating block 8, which stops heating, preventing the temperature at the bottom of crucible 1 from becoming too high and affecting the melting quality of the metal material.

[0033] The heating block 8 is embedded in the heating groove 5 at the bottom of the crucible 1. It can transfer heat to the heating groove 5 located on the lower surface of the crucible 1 through its own heating. The heating groove 5 then transfers the heat to other positions at the bottom of the crucible 1, and then conducts the heat to the metal material located at the bottom of the inner cavity of the crucible 1, thereby heating it. This can solve the technical problem of insufficient heating of the metal material located at the bottom of the inner cavity of the crucible 1 in the prior art. The compensatory heating of the bottom of the crucible 1 by the heating block 8 is only activated when the temperature at the bottom of the crucible 1 is insufficient. When the temperature is too high, it automatically cuts off the power, which can avoid continuous high energy consumption.

[0034] In this embodiment, a power supply battery is also included. The heating block 8 has a hollow structure, and heating wires are installed inside the heating block 8. The heating wires in each heating block 8 are connected in series and electrically connected to the power supply battery. The power supply battery provides current to the series-connected heating wires. The microprocessor controls the heating and stopping of all heating wires by controlling the on / off state of the control circuit. The series circuit ensures that all heating wires operate synchronously and at the same power, reduces the complexity of the power supply line, and the series synchronous heating can make the bottom area of ​​the crucible 1 as uniformly heated as possible.

[0035] In this embodiment: the heating block 8 is cylindrical, and its inner wall is provided with a spiral mounting groove. The heating wire is wound around the mounting groove, and the diameter of the heating wire is adapted to the width of the mounting groove. When the heating wire heats up, it transfers heat to the side wall of the heating block 8, which then transfers the heat to the heating groove 5. The heating groove 5 then transfers the heat to other positions at the bottom of the crucible 1, thereby heating the bottom of the crucible 1. Because the heating wire is wound around the spiral mounting groove, it is also spiral in shape. The spiral structure of the heating wire increases the heating area and improves the heat transfer efficiency.

[0036] In this embodiment, a heat insulation sheet 9 is provided between the crucible 1 and the induction coil 4. The heat insulation sheet 9 in this invention can be made of zirconium-containing ceramic fiber, with a long-term temperature resistance of 1260℃ and a short-term peak temperature resistance of 1400℃. It can completely cover the outer surface temperature of the crucible 1 during iron smelting, has a low thermal conductivity, and excellent heat insulation effect, significantly reducing heat conduction to the induction coil 4. It is also non-magnetic and insulating, does not affect magnetic field penetration, and can prevent short circuits in the induction coil 4. During installation, the heat insulation sheet 9 is wrapped around the outer wall of the crucible 1 before the induction coil 4 is wound around it. Because the heat insulation sheet 9 has an extremely low thermal conductivity, it forms a heat insulation barrier between the crucible 1 and the induction coil 4, preventing heat loss from the crucible 1 and thus improving the heating effect. In addition, it can prevent heat from the crucible 1 from being conducted to the coil, preventing the insulating varnish of the induction coil 4 from failing due to high temperatures.

[0037] In this embodiment: Refractory bricks 10 are provided along the edge of the crucible 1, and the refractory bricks 10 are arranged around the periphery of the crucible 1. In this embodiment, the refractory bricks 10 are fixed to the periphery of the crucible 1 by masonry. The refractory bricks 10 are sequentially spliced ​​along the circumference of the crucible 1, and high-temperature refractory mortar is provided between the refractory bricks 10 and the crucible 1 to fill the gap. An iron core 11 is provided under the refractory bricks 10. The iron core 11 is cylindrical. The top of the iron core 11 is fixedly connected to the refractory bricks 10, and the bottom of the iron core 11 is fixedly connected to the heat insulation plate 3. The iron core 11 is located outside the induction coil 4. In this embodiment, the top of the iron core 11 is fixed to the bottom of the refractory bricks 10 by bolts and nuts, and the bottom of the iron core 11 is fixed to the heat insulation plate 3 by bolts and nuts. The iron core 11 can confine the magnetic field to the periphery of the crucible 1, thereby increasing the magnetic field strength and improving the melting efficiency.

[0038] The above are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A cast-iron hearth melting temperature control device, comprising a crucible made of refractory material, a cover body being provided on the top of the crucible, a heat insulation plate being provided below the crucible, and an induction coil being provided around the circumference of the crucible along the height direction thereof, characterized in that: It also includes a microprocessor. The lower surface of the crucible is evenly spaced with multiple inwardly recessed heating grooves. The heat insulation plate has multiple perforations on its surface facing the crucible. The positions of the perforations correspond one-to-one with the positions of the heating grooves. The heat insulation plate has an installation chamber that communicates with all the perforations. An installation plate is installed in the installation chamber. The surface of the installation plate facing the crucible has multiple heating blocks with heating functions. The positions of the heating blocks correspond one-to-one with the positions of the perforations. The heating blocks are located in the perforations and extend toward the corresponding heating grooves. A temperature sensor is installed on the top of the cover. The temperature sensor and the heating blocks are electrically connected to the microprocessor.

2. A cast iron forge hearth melting temperature control device according to claim 1, characterised in that: It also includes a power supply battery. The heating block has a hollow structure and is equipped with heating wires. The heating wires in each heating block are connected in series and electrically connected to the power supply battery.

3. A cast iron forge hearth melting temperature control device according to claim 2, characterised in that: The heating block is cylindrical, and a spiral mounting groove is provided on the inner wall of the heating block. The heating wire is wound in the mounting groove, and the diameter of the heating wire is adapted to the width of the mounting groove.

4. The cast iron furnace head smelting temperature control device according to claim 1, characterized in that: A heat insulation sheet is provided between the crucible and the induction coil.

5. The cast iron furnace head smelting temperature control device according to claim 1, characterized in that: The crucible has refractory bricks arranged along its edge and surrounding the crucible. An iron core is arranged below the refractory bricks. The iron core is cylindrical, with its top fixedly connected to the refractory bricks and its bottom fixedly connected to the heat insulation plate. The iron core is located outside the induction coil.

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