Intermediate frequency smelting furnace and furnace campaign recording method thereof

Abstract

The application discloses a medium-frequency smelting furnace and a furnace cycle recording method thereof. The medium-frequency smelting furnace comprises a control system and a smelting furnace body. The smelting furnace body is provided with a medium-frequency smelting furnace power supply cabinet on one side. The medium-frequency smelting furnace power supply cabinet is electrically connected with the smelting furnace body through a power line. The medium-frequency smelting furnace power supply cabinet is provided with an ammeter and a voltmeter. The smelting furnace body is provided with a furnace body posture sensor for detecting the inclination angle on the outer surface. The smelting furnace body is also provided with a tilting mechanism. The medium-frequency smelting furnace and the furnace cycle recording method thereof can judge whether the iron liquid pouring process of the current furnace cycle is completed by detecting the posture of the smelting furnace body relative to the horizontal plane and comprehensively considering the electrical parameters of the medium-frequency smelting furnace power supply system. The control system records the time period experienced by the initial time and the end time, and records the power consumption and the change of the furnace body weighing sensor reading in the time period. The furnace cycle of the medium-frequency smelting furnace is recorded more accurately, and manual re-statistics of the furnace cycle is not needed.

Description

Technical Field

[0001] This invention relates to smelting furnace technology, specifically to a medium-frequency smelting furnace and a method for recording furnace cycles. Background Technology

[0002] A furnace run refers to the process from an empty furnace to the completion of melting a batch of molten iron, after which the molten iron is completely poured out of the furnace, making it ready for the addition of raw materials for melting again. Accurate furnace run information is crucial for the factory production management and cost statistics of furnace users. For example, it is used to calculate key production data for factory management, such as output, power consumption for each furnace run, and power consumption per ton of output.

[0003] However, the current furnace count records for medium-frequency induction furnaces are usually based on the analysis and recording of the electrical parameters of the medium-frequency power supply system. This method results in highly inaccurate furnace count records, sometimes requiring manual recounting. For example, after smelting, when the molten iron in the furnace needs to be poured out in multiple batches, the power supply of the medium-frequency induction furnace needs to be readjusted from the pouring mode to the smelting mode after each pour to reheat the remaining molten iron in the furnace to ensure that the temperature of the molten iron meets the process requirements for the next pour. In this scenario, if only the electrical parameters of the medium-frequency furnace power supply system are used for recording, each pour will be recorded as a furnace count, leading to errors in furnace count calculation. Summary of the Invention

[0004] In view of the above-mentioned shortcomings in the prior art, the present invention provides a medium-frequency melting furnace and a furnace recording method thereof, which solves the problem of inaccurate furnace recording in existing melting furnaces.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0006] In a first aspect, a medium-frequency melting furnace is provided, which includes a control system and a furnace body. A medium-frequency melting furnace power supply cabinet is provided on one side of the furnace body. The medium-frequency melting furnace power supply cabinet is electrically connected to the furnace body via a power line. An ammeter and a voltmeter are provided inside the medium-frequency melting furnace power supply cabinet. A furnace body attitude sensor for detecting its tilt angle is provided on the outer surface of the furnace body. A furnace body weighing sensor for detecting weight is provided below the furnace body. A furnace body support base is provided below the furnace body weighing sensor. A tilting mechanism is also provided on the furnace body.

[0007] The power supply cabinet, furnace body attitude sensor, furnace body weighing sensor, and tilting mechanism of the medium-frequency melting furnace are all electrically connected to the control system.

[0008] Furthermore, the bottom of the furnace body support base is fixedly connected to the ground, and when the furnace body weighing sensor is in contact with the top of the furnace body support base, the top of the smelting furnace body is in a horizontal position. The furnace body weighing sensor can also detect the weight of the smelting furnace body and the molten iron inside when in contact with the top of the furnace body support base.

[0009] Further, as a specific implementation of the tilting mechanism, the tilting mechanism includes a mounting ring plate, two hydraulic cylinders, and two tilting support shafts; the mounting ring plate is located at the top opening of the smelting furnace body; the two hydraulic cylinders are symmetrically arranged on both sides of the smelting furnace body with the axis of the smelting furnace body as the center, the tail end of each hydraulic cylinder is connected to the ground through a bearing seat, and the piston end of each hydraulic cylinder is hinged to the lower end face of the mounting ring plate; the two tilting support shafts are symmetrically arranged on both sides of the smelting furnace body with the axis of the smelting furnace body as the center, the bottom of each tilting support shaft is fixedly connected to the ground, and the top of each tilting support shaft is hinged to the lower end face of the mounting ring plate; the two hydraulic cylinders drive the smelting furnace body to rotate around the top of the tilting support shafts; the hydraulic system in the two hydraulic cylinders is electrically connected to the control system.

[0010] When the two hydraulic cylinders extend, they drive the furnace body to rotate clockwise around the top of the tilting support shaft, allowing the furnace body to complete the pouring of molten iron. When the two hydraulic cylinders retract, they drive the furnace body to rotate counterclockwise around the top of the tilting support shaft until the bottom of the furnace body contacts the top of the furnace body support base, and the mounting ring plate at the top of the furnace body is in a horizontal position, returning the furnace body to its initial position.

[0011] Furthermore, as a specific arrangement for hinged connection between the piston end of the hydraulic cylinder and the lower end face of the mounting ring plate, each piston end of the hydraulic cylinder is hinged to a first connecting plate via a pin, and the top of the first connecting plate is fixedly connected to the lower end face of the mounting ring plate.

[0012] Furthermore, as a specific arrangement for hinged connection between the top of the tilting support shaft and the lower end face of the mounting ring plate, the top of each tilting support shaft is hinged to a second connecting plate via a pin, and the top of the second connecting plate is fixedly connected to the lower end face of the mounting ring plate.

[0013] Secondly, a method for recording the furnace number of a medium-frequency melting furnace is also provided, the method comprising the following steps:

[0014] Step 1: Initialize the medium-frequency melting furnace: The furnace body attitude sensor detects that the melting furnace body is in a horizontal position, and the furnace body weighing sensor detects that the melting furnace body is placed on top of the furnace body support base; the control system records the initial time.

[0015] Step 2: Connect the power supply to the medium-frequency melting furnace and enter the melting state: The control system starts the power supply cabinet of the medium-frequency melting furnace. The medium-frequency voltage, current and incoming power of the medium-frequency melting furnace power supply system are all greater than the medium-frequency voltage threshold, medium-frequency current threshold and incoming power threshold of the medium-frequency melting furnace power supply system to start the melting state. The power supply time is greater than the preset time.

[0016] Step 3, Tilting the smelting furnace body: The control system starts the extension of the two hydraulic cylinders in the tilting mechanism, driving the smelting furnace body to rotate around the top of the tilting support shaft. The furnace body attitude sensor detects the angle θ between the top of the smelting furnace body and the horizontal plane in real time.

[0017] Step 4: Reset the smelting furnace body: When the included angle θ reaches the preset tilt angle range of the smelting furnace body, the control system starts the retraction of the two hydraulic cylinders in the tilting mechanism, driving the smelting furnace body to rotate around the top of the tilting support shaft until the furnace body attitude sensor detects that the smelting furnace body is in a horizontal attitude and the furnace body weighing sensor detects that the smelting furnace body is placed on the top of the furnace body support base; the control system records the end time.

[0018] Step 5: Record the furnace cycle of the medium frequency melting furnace: The control system records the time period between the initial time and the end time, and records the power consumption during this time period as the power consumption of the furnace cycle. It also records the change in the furnace weighing sensor reading during this time period as the output of the furnace cycle.

[0019] Step 6: Repeat steps 1 to 5 to complete the furnace number recording for the medium-frequency melting furnace.

[0020] Furthermore, in step 2, the preset time ranges from 5 min to 10 min.

[0021] Furthermore, in step 3, the preset tilt angle of the smelting furnace body is in the range of 80° to 90°. Only when the included angle θ is close to 90 degrees can all the molten iron in the furnace be completely poured out.

[0022] The beneficial effects of this invention are as follows: The medium-frequency melting furnace and its furnace cycle recording method in this solution determine whether the molten iron pouring process for this furnace cycle has been completed by detecting the attitude of the melting furnace body relative to the horizontal plane and simultaneously considering the electrical parameters of the medium-frequency melting furnace power supply system. The control system records the time period between the initial and final times, and records the power consumption during this time period as the furnace cycle power consumption. It also records the change in the furnace body weighing sensor reading during this time period as the furnace cycle output. Compared to methods that only use the electrical parameters of the medium-frequency melting furnace power supply system to record furnace cycles, this medium-frequency melting furnace and its furnace cycle recording method more accurately records the furnace cycles and eliminates the need for manual recounting of furnace cycles. Attached Figure Description

[0023] Figure 1This is a side view of a medium-frequency melting furnace.

[0024] Figure 2 This is a front view schematic diagram of a medium-frequency melting furnace.

[0025] Figure 3 This is a schematic diagram of the tilting structure of a medium-frequency melting furnace.

[0026] The components include: 1. Smelting furnace body; 2. Medium frequency smelting furnace power supply cabinet; 3. Power cord; 4. Furnace body attitude sensor; 5. Furnace body weighing sensor; 6. Furnace body support base; 7. Mounting ring plate; 8. Hydraulic cylinder; 9. Tilting support shaft; 10. First connecting plate; 11. Second connecting plate. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the 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 invention without inventive effort are within the scope of protection of the invention.

[0029] 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.

[0030] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0031] First Embodiment

[0032] Please refer to Figures 1-3 As shown, the medium-frequency melting furnace provided in this solution includes a control system and a melting furnace body 1. A medium-frequency melting furnace power supply cabinet 2 is installed on the left side of the melting furnace body 1. The medium-frequency melting furnace power supply cabinet 2 is electrically connected to the melting furnace body 1 through a power line 3. An ammeter and a voltmeter are installed inside the medium-frequency melting furnace power supply cabinet 2. The ammeter and voltmeter are used to detect the medium-frequency voltage and medium-frequency current of the medium-frequency melting furnace, respectively. The control system can calculate the incoming power of the medium-frequency melting furnace power supply cabinet 2 in real time based on the medium-frequency voltage and medium-frequency current of the medium-frequency melting furnace.

[0033] A furnace body attitude sensor 4 for detecting its tilt angle is installed on the outer surface of the smelting furnace body 1. A furnace body weighing sensor 5 for detecting weight is installed below the smelting furnace body 1. A furnace body support base 6 is installed below the furnace body weighing sensor 5. A tilting mechanism is also installed on the smelting furnace body 1. The medium frequency smelting furnace power cabinet 2, the furnace body attitude sensor 4, the furnace body weighing sensor 5 and the tilting mechanism are all electrically connected to the control system.

[0034] As a specific implementation of the tilting mechanism, the tilting mechanism includes a mounting ring plate 7, two hydraulic cylinders 8, and two tilting support shafts 9; the mounting ring plate 7 is located at the top opening of the smelting furnace body 1; the two hydraulic cylinders 8 are symmetrically arranged on both sides of the smelting furnace body 1 with the axis of the smelting furnace body 1 as the center, the tail end of each hydraulic cylinder 8 is connected to the ground through a bearing seat, and the piston end of each hydraulic cylinder 8 is hinged to the lower end face of the mounting ring plate 7; the two tilting support shafts 9 are symmetrically arranged on both sides of the smelting furnace body 1 with the axis of the smelting furnace body 1 as the center, the bottom of each tilting support shaft 9 is fixedly connected to the ground, and the top of each tilting support shaft 9 is hinged to the lower end face of the mounting ring plate 7; the two hydraulic cylinders 8 drive the smelting furnace body 1 to rotate around the top of the tilting support shafts 9; the hydraulic system in the two hydraulic cylinders 8 is electrically connected to the control system.

[0035] In this embodiment, the selection and internal structure of the medium frequency melting furnace power cabinet 2, furnace body attitude sensor 4, furnace body weighing sensor 5 and control system are all existing technologies. The working principle of each component and the specific connection relationship between the components are not specified here.

[0036] Preferably, as a specific arrangement of the furnace body support base 6, the bottom of the furnace body support base 6 is fixedly connected to the ground, and when the furnace body weighing sensor 5 is in contact with the top of the furnace body support base 6, the top of the smelting furnace body 1 is in a horizontal position. When the furnace body weighing sensor 5 is in contact with the top of the furnace body support base 6, it can also detect the weight of the smelting furnace body 1 and the molten iron inside the furnace.

[0037] When the two hydraulic cylinders 8 extend, they drive the smelting furnace body 1 to rotate clockwise around the top of the tilting support shaft 9, so that the smelting furnace body 1 completes the work of tilting molten iron. When the two hydraulic cylinders 8 retract, they drive the smelting furnace body 1 to rotate counterclockwise around the top of the tilting support shaft 9 until the bottom of the smelting furnace body 1 contacts the top of the furnace body support base 6, and the mounting ring plate 7 on the top of the smelting furnace body 1 is in a horizontal position, returning to the initial position of the smelting furnace body 1.

[0038] As a specific arrangement for hinged connection between the piston end of the hydraulic cylinder 8 and the lower end face of the mounting ring plate 7, each hydraulic cylinder 8 has a first connecting plate 10 hinged to its piston end via a pin, and the top of the first connecting plate 10 is fixedly connected to the lower end face of the mounting plate. As a specific arrangement for hinged connection between the top of the tilting support shaft 9 and the lower end face of the mounting ring plate 7, each tilting support shaft 9 has a second connecting plate 11 hinged to its top via a pin, and the top of the second connecting plate 11 is fixedly connected to the lower end face of the mounting plate.

[0039] Second Embodiment

[0040] This invention also provides a method for recording furnace cycles in a medium-frequency induction furnace, wherein the structure of the medium-frequency induction furnace is as shown in the first embodiment. The furnace cycle recording method includes the following steps:

[0041] Step 1: Initialize the medium-frequency melting furnace: Furnace body attitude sensor 4 detects that the melting furnace body 1 is in a horizontal position, and furnace body weighing sensor 5 detects that the melting furnace body 1 is placed on top of the furnace body support base 6; the control system records the initial time.

[0042] Step 2: Connect the power supply to the medium-frequency melting furnace and enter the melting state: The control system starts the power supply cabinet 2 of the medium-frequency melting furnace. The medium-frequency voltage, current and incoming power of the medium-frequency melting furnace power supply system are all greater than the medium-frequency voltage threshold, medium-frequency current threshold and incoming power threshold of the medium-frequency melting furnace power supply system to start the melting state. The power supply time is greater than the preset time.

[0043] Step 3, Tilting the smelting furnace body 1: The control system starts the extension of the two hydraulic cylinders 8 in the tilting mechanism, driving the smelting furnace body 1 to rotate around the top of the tilting support shaft 9. The furnace body attitude sensor 4 detects the angle θ between the top of the smelting furnace body 1 and the horizontal plane in real time.

[0044] Step 4, Reset the smelting furnace body 1: When the included angle θ reaches the preset tilt angle range of the smelting furnace body 1, the control system starts the retraction of the two hydraulic cylinders 8 in the tilting mechanism, driving the smelting furnace body 1 to rotate around the top of the tilting support shaft 9 until the furnace body attitude sensor 4 detects that the smelting furnace body 1 is in a horizontal attitude and the furnace body weighing sensor 5 detects that the smelting furnace body 1 is placed on the top of the furnace body support base 6; the control system records the end time;

[0045] Step 5: Record the furnace cycle of the medium frequency melting furnace: The control system records the time period between the initial time and the end time, and records the power consumption during this time period as the power consumption of the furnace cycle. It also records the change in the reading of the furnace weighing sensor 5 during this time period as the output of the furnace cycle.

[0046] Step 6: Repeat steps 1 to 5 to complete the furnace number recording for the medium-frequency melting furnace.

[0047] Furthermore, in step 2, the preset time range is 5 min to 10 min.

[0048] Furthermore, in step 3, the preset tilt angle of the smelting furnace body 1 is in the range of 80° to 90°. Only when the included angle θ is close to 90 degrees can all the molten iron in the furnace be completely poured out.

[0049] In summary, the furnace cycle recording method of the medium-frequency melting furnace in this scheme determines whether the molten iron pouring process for this furnace cycle has been completed by detecting the attitude of the melting furnace body 1 relative to the horizontal plane and simultaneously considering the electrical parameters of the medium-frequency melting furnace power supply system. The control system records the time interval between the initial and final times, and records the power consumption during this time interval as the furnace cycle power consumption. It also records the change in the reading of the furnace body weighing sensor 5 during this time interval as the furnace cycle output. Compared to methods that only use the electrical parameters of the medium-frequency melting furnace power supply system to record furnace cycles, this scheme's medium-frequency melting furnace and its furnace cycle recording method more accurately record the furnace cycles, eliminating the need for manual recounting of furnace cycles.

[0050] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for recording the number of furnace cycles in a medium-frequency induction melting furnace, characterized in that, The medium-frequency melting furnace includes a control system, a furnace body, a power supply cabinet, a furnace body attitude sensor, a furnace body weighing sensor, a furnace body support base, and a tilting mechanism. The tilting mechanism includes a mounting ring plate, two hydraulic cylinders, and two tilting support shafts. The mounting ring plate is located at the top opening of the furnace body. The two hydraulic cylinders and the two tilting support shafts are symmetrically arranged on both sides of the furnace body with the furnace body axis as the center. The tail end of each hydraulic cylinder is connected to the ground, and the piston end is hinged to the mounting ring plate. The bottom of each tilting support shaft is fixedly connected to the ground, and the top is hinged to the mounting ring plate. The furnace cycle recording method includes the following steps: Step 1: Initialize the medium-frequency melting furnace: The furnace body attitude sensor detects that the melting furnace body is in a horizontal position, and the furnace body weighing sensor detects that the melting furnace body is placed on top of the furnace body support base; the control system records the initial time. Step 2: Connect the power supply to the medium-frequency melting furnace and enter the melting state: The control system starts the power supply cabinet of the medium-frequency melting furnace. The medium-frequency voltage, current and incoming power of the medium-frequency melting furnace power supply system are all greater than the medium-frequency voltage threshold, medium-frequency current threshold and incoming power threshold of the medium-frequency melting furnace power supply system to start the melting state. The power supply time is greater than the preset time. Step 3, Tilting the smelting furnace body: The control system starts the extension of the two hydraulic cylinders in the tilting mechanism, driving the smelting furnace body to rotate around the top of the tilting support shaft. The furnace body attitude sensor detects the angle θ between the top of the smelting furnace body and the horizontal plane in real time. Step 4: Reset the smelting furnace body: When the included angle θ reaches the preset tilt angle range of the smelting furnace body, the control system starts the retraction of the two hydraulic cylinders in the tilting mechanism, driving the smelting furnace body to rotate around the top of the tilting support shaft until the furnace body attitude sensor detects that the smelting furnace body is in a horizontal attitude and the furnace body weighing sensor detects that the smelting furnace body is placed on the top of the furnace body support base; the control system records the end time. Step 5: Record the furnace cycle of the medium frequency melting furnace: The control system records the time period between the initial time and the end time, and records the power consumption during this time period as the power consumption of the furnace cycle. It also records the change in the furnace weighing sensor reading during this time period as the output of the furnace cycle. Step 6: Repeat steps 1-5 to complete the furnace number recording for the medium-frequency melting furnace.

2. The furnace cycle recording method for a medium-frequency induction melting furnace according to claim 1, characterized in that, In step 2, the preset time ranges from 5 min to 10 min.

3. The method for recording furnace cycles in a medium-frequency induction melting furnace according to claim 1, characterized in that, In step 3, the preset tilt angle of the smelting furnace body is in the range of 80°~90°.

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