A method for controlling the tilting angle of a converter

Abstract

The present invention provides a method for controlling the tilting angle of a converter, which relates to the technical field of converter smelting and comprises the following steps: step one: setting an interlock, setting an interlocking program in a converter controller, and performing manual operation based on a display of the controller; step two: iron adding control, during the iron adding process of the converter, the fan is in a high-speed state, and during the synchronous iron adding stage, the interlocking tilting angle is controlled to be ≯﹢80°; step three: interlock release, when the tilting angle returns to zero, oxygen blowing starts, and the interlock is automatically released; step four: blowing control, when the oxygen blowing time is displayed to be greater than 0 seconds, the interlocking tilting angle is controlled to be greater than ﹢65°; the present invention is beneficial for preventing the converter from shaking the furnace too much during the iron adding process, causing an accident where molten iron pours into the furnace, preventing the converter from shaking the furnace too much during the slag pouring and temperature measurement process, causing molten steel pouring into the furnace and personal injury, and preventing the converter from tapping steel from the furnace mouth due to untimely tilting downshift during the shaking process.

Description

Technical Field

[0001] The present invention relates to the technical field of converter smelting, and in particular to a method for controlling the tilting angle of a converter. Background Art

[0002] Converter tilting and shaking operation is a very important operation link in the smelting process. According to the smelting situation, the tilting needs to be shaken to different angles and runs through the entire smelting process. If the operator is not careful, it may cause the molten steel to tip over and threaten personal safety.

[0003] The tilting action of the converter is mainly achieved by the operator turning the handle to achieve a 180° rotation of the furnace body forward and backward (as required by the smelting situation). In one converter smelting cycle, the converter undergoes at least two forward tilts and one backward tilt to complete the smelting process. The tilting operation is controlled by PLC, and manual operation is started and reset to achieve the movement and braking of the converter body. During countless slag pouring, iron adding and steel tapping operations, it is difficult to avoid accidents of molten steel pouring into the furnace by relying solely on humans to achieve precise tilting operations. Therefore, the present invention proposes a method for controlling the tilting angle of the converter to solve the problems existing in the prior art. Summary of the Invention

[0004] In response to the above problems, the present invention proposes a method for controlling the tilting angle of the converter. The method for controlling the tilting angle of the converter optimizes the tilting angle interlock of the shaking furnace operation without affecting normal smelting, thereby eliminating accidents of molten steel tipping caused by human operation and ensuring normal production.

[0005] To achieve the purpose of the present invention, the present invention is implemented through the following technical solutions: A method for controlling the tilting angle of a converter comprises the following steps:

[0006] Step 1: Set up interlock

[0007] Set up interlocking procedures in the converter controller and perform manual operations based on the controller display;

[0008] Step 2: Iron control

[0009] During the iron adding process of the converter, the fan is in high speed state, which is the iron adding stage at this time, and the control interlock tilting angle is ≯﹢80°;

[0010] Step 3: Interlock release

[0011] When the tilting angle returns to zero, oxygen blowing begins and the interlock is automatically released at this stage;

[0012] Step 4: Blowing Control

[0013] At the start of blowing, when the oxygen blowing time is greater than 0 seconds on the display, the control interlock tilting angle is greater than 65°, and the furnace is automatically limited to N gear and not greater than the set angle;

[0014] Step 5: Steel tapping control

[0015] For steel tapping from the back of the furnace, the standard is to tilt the machine to -80° for formal steel tapping. When the tilting angle is tilted to -60° from the back of the furnace, the operation is automatically limited to N gear.

[0016] A further improvement is that in step 2, the high-speed state of the fan is used to control dust.

[0017] A further improvement is that in step 2, the interlock tilting angle is controlled to be ≯﹢80°, so as to prevent the accident of molten steel pouring into the furnace due to the accident of the furnace shaking angle being too large by mistake.

[0018] A further improvement is that in step three, when oxygen blowing starts, specifically when the oxygen blowing time is counted and displayed, the interlock is automatically released at this stage.

[0019] A further improvement is that in step 4, the furnace shaking is automatically limited to N gears and not greater than a predetermined angle. This gear and angle are manually set on the display screen of the controller, and the values are set before and after the furnace service.

[0020] Further improvements are: after setting the values before and after the furnace is put into service, the identity of the person who set them is verified to provide authority protection.

[0021] A further improvement is that in step five, the operation is automatically limited to N gear to prevent accidents caused by human factors such as untimely downshifting, excessively fast gear tilting and inertia slipping, which may cause molten steel to pour out of the furnace mouth.

[0022] The beneficial effects of the present invention are:

[0023] 1. The present invention increases the tilting angle in different time periods: during iron addition and slag pouring and blowing in front of the furnace, the fan speed and oxygen blowing time are interlocked to prevent accidents such as molten steel pouring into the furnace due to misoperation, and the tilting gear control is used to interlock the tilting angle in the steel tapping stage to prevent accidents such as large inertia molten steel pouring out of the furnace mouth due to excessive gear control. In summary, it is beneficial to prevent accidents such as molten iron pouring into the furnace due to excessive shaking of the converter during the iron addition process, preventing accidents such as molten steel pouring into the furnace due to excessive shaking of the converter during slag pouring and temperature measurement, and preventing accidents such as equipment damage and personal injury due to steel tapping from the furnace mouth due to untimely tilting downshift during the converter tapping process.

[0024] 2. The gear positions and predetermined angles limited by the present invention are manually set on the display screen of the controller. The values are set before and after the furnace operation, and the identity of the person setting them is verified to provide authority protection, which is conducive to improving the security of the settings, avoiding arbitrary modifications, and ensuring normal smelting and inclination control. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1It is a schematic diagram of the process of the present invention;

[0026] Figure 2 It is a schematic diagram of the converter of the present invention. DETAILED DESCRIPTION

[0027] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the examples. The examples are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0028] Example 1

[0029] according to Figure 1 、 2 As shown, this embodiment provides a method for controlling the tilting angle of a converter, comprising the following steps:

[0030] Step 1: Set up interlock

[0031] Set up interlocking procedures in the converter controller and perform manual operations based on the controller display;

[0032] Step 2: Iron control

[0033] During the iron-adding process, the blower is in high-speed state. At this time, it is synchronized with the iron-adding stage, and the control interlock tilting angle is ≯﹢80°. This prevents the converter from tilting too much during the iron-adding process, causing the molten iron to fall under the furnace.

[0034] Step 3: Interlock release

[0035] When the tilting angle returns to zero, oxygen blowing begins and the interlock is automatically released at this stage;

[0036] Step 4: Blowing Control

[0037] At the start of blowing, when the oxygen blowing time is greater than 0 seconds on the display, the control interlock tilting angle is greater than 65°, and the furnace is automatically limited to N gear and not greater than the preset angle; this prevents the converter from tilting too much during the slag pouring and temperature measurement process, causing molten steel to pour into the furnace and personal injury accidents;

[0038] Step 5: Steel tapping control

[0039] When tapping from the furnace, the standard is to tilt to -80° for tapping. When the tilt angle reaches -60°, the operation is automatically limited to N gear. This prevents equipment damage and personal injury accidents caused by untimely tilting downshift during the converter tapping process.

[0040] The present invention increases the tilting angle in different time periods: during iron addition and slag pouring and blowing in front of the furnace, interlocks the fan speed and oxygen blowing time to prevent accidents such as molten steel pouring into the furnace due to misoperation, and uses the tilting gear control to interlock the tilting angle in the steel tapping stage to prevent accidents such as large inertia molten steel pouring out of the furnace mouth due to excessive gear control. In summary, it is beneficial to prevent accidents such as molten iron pouring into the furnace due to excessive shaking of the converter during the iron addition process, preventing accidents such as molten steel pouring into the furnace due to excessive shaking of the converter during slag pouring and temperature measurement processes, and preventing accidents such as equipment damage and personal injury due to steel tapping from the furnace mouth caused by untimely tilting downshift during the converter steel tapping and shaking process. It has been verified that the average number of tilting operation accidents in previous years has been reduced to 0 after the use of this method.

[0041] Example 2

[0042] This embodiment provides a method for controlling the tilting angle of a converter, comprising the following steps:

[0043] At the start of blowing, when the display shows that the oxygen blowing time is greater than 0 seconds, the control interlock tilting angle is greater than +65°, and the furnace is automatically limited to N gear shaking and not greater than the set angle. This gear and angle are manually set on the display screen of the controller, and the values are set before and after the furnace service. After the values are set before and after the furnace service, the identity of the person who sets the value is verified, specifically by password input, face recognition, and fingerprint recognition, to provide authority protection.

[0044] The gear position and the established angle limited by the present invention are manually set on the display screen of the controller. The values are set before and after the furnace service, and the identity of the setter is verified to provide authority protection, which is beneficial to improve the security of the setting, avoid arbitrary modification, and ensure normal smelting and inclination control.

[0045] Example 3

[0046] according to Figure 1 、 2 As shown, this embodiment provides a method for controlling the tilting angle of a converter, comprising the following steps:

[0047] During the iron-adding process, the converter's fan is already at high speed (to control dust generation). This is the iron-adding phase, and the interlock is set to a tilt angle of ≤80° to prevent accidents caused by excessive tilting, which could result in molten steel pouring into the furnace. When the tilt angle returns to zero and oxygen blowing begins (with oxygen blowing time), the interlock is automatically released. This prevents accidents caused by excessive tilting, which could result in molten iron pouring into the furnace.

[0048] At the start of blowing, if the oxygen blowing time is displayed as >0 seconds, the interlock tilt angle is automatically limited to level 1 and cannot exceed the preset angle (an additional screen can be manually set, based on the value set before and after the furnace is put into service, with permission protection) to prevent molten steel from pouring into the furnace. This prevents excessive tilting of the converter during slag pouring and temperature measurement, which may cause molten steel to pour into the furnace and cause personal injury.

[0049] When tapping steel from the furnace, the tilting angle must be tilted to -80° before tapping officially begins. When the tilting angle reaches -60°, the program automatically limits the operation to gear 1. This prevents accidents caused by human error such as untimely gear reduction, excessively fast gear tilting and inertia slipping, which can cause molten steel to pour out of the furnace mouth. This also prevents equipment damage and personal injury accidents caused by untimely gear reduction during the converter tapping process.

[0050] Verification example:

[0051] The addition of program interlock protection to the single human control essentially prevents accidents. After the interlock program was put into use, the average number of tilting operation accidents was reduced from 2 in previous years to 0.

[0052] The method for controlling the tilting angle of the converter increases the tilting angle in different time periods: during iron addition and slag pouring and blowing in front of the furnace, interlocks the fan speed and oxygen blowing time to prevent accidents caused by misoperation leading to molten steel pouring into the furnace, and uses the tilting gear control to interlock the tilting angle during the steel tapping stage to prevent accidents caused by excessive gear control leading to large inertia molten steel pouring out of the furnace mouth. In summary, it is beneficial to prevent accidents caused by excessively large rocking angles of the converter during the iron addition process, causing molten iron to pour into the furnace, preventing accidents caused by excessive rocking angles of the converter during slag pouring and temperature measurement, causing molten steel to pour into the furnace and personal injury, and preventing accidents caused by untimely tilting gear reduction during the converter tapping process, causing equipment damage and personal injury. After verification, the method has reduced the average number of tilting operation accidents from 2 in previous years to 0. At the same time, the gears and predetermined angles limited by the present invention are manually set on the display screen of the controller, and the values are set before and after the furnace service, and the identity of the setter is verified to provide authority protection, which is beneficial to improving the security of the setting, avoiding arbitrary modification, and ensuring normal smelting and tilt angle control.

[0053] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for controlling the tilting angle of a converter, characterized in that: The following steps are involved: Step 1: Set up interlock Set up interlocking procedures in the converter controller and perform manual operations based on the controller display; Step 2: Iron control During the converter iron charging process, the fan is in high-speed state, which is synchronized with the iron charging stage. The control interlock tilting angle is ≯﹢80° to prevent the accident of molten steel pouring into the furnace due to excessive tilting angle caused by mistake; Step 3: Interlock release When the tilting angle returns to zero, oxygen blowing begins and the interlock is automatically released at this stage; Step 4: Blowing Control At the start of blowing, when the display shows that the oxygen blowing time is greater than 0 seconds, the control interlock tilting angle is greater than 65°, and the furnace is automatically limited to N gear and not greater than the preset angle. This gear and angle are manually set on the controller display screen, and the values are set before and after the furnace service; Step 5: Steel tapping control For steel tapping from the back of the furnace, the standard is to tilt the car to -80° normally for formal steel tapping. When the tilting angle is tilted to -60° at the back of the furnace, it is automatically limited to N gear operation to prevent accidents caused by human factors such as untimely downshifting, excessively fast tilting and inertia slipping, which may cause molten steel to pour out of the furnace mouth.

2. The method for controlling the tilting angle of a converter according to claim 1, wherein: In the step 2, the high-speed state of the fan is used to control dust.

3. The method for controlling the tilting angle of a converter according to claim 1, wherein: In the step 3, when the oxygen blowing starts, specifically when the oxygen blowing time is counted and displayed, the interlock is automatically released at this stage.

4. The method for controlling the tilting angle of a converter according to claim 3, wherein: After setting the values before and after the furnace is put into service, the identity of the person who set it is verified to provide authority protection.

Images