A furnace lining thickness measuring device and measuring and maintenance method

Abstract

The present application relates to a kind of furnace lining thickness measuring device and measurement and maintenance method, belong to steel metallurgy technical field, solve the problem of existing furnace lining thickness measurement process discontinuity, long time consumption, maintenance measure is not timely.A kind of furnace lining thickness measuring device, including slide rail, track car, laser thickness gauge, mechanical arm, control cabinet and controller;Slide rail is double rail track, double rail track is parallel to each other, set up before fire dam, including outer track and inner track;Track car travels on slide rail, including communication system, brake system, carrying system and track cleaning device;Laser thickness gauge includes thickness measuring probe and protective cover, protective cover includes slag baffle and cooling air curtain;Mechanical arm includes lifting arm, rotating arm and telescopic arm;Controller includes maintenance control module.The present application utilizes converter body time, completes furnace lining thickness measurement, furnace lining maintenance and measurement again, realizes the continuous thickness measurement of furnace lining in converter smelting process, measurement time is shorter, and furnace lining thickness tracking is timely.

Description

Technical Field

[0001] This invention relates to the field of iron and steel metallurgy technology, and in particular to a furnace lining thickness measuring device and a method for measuring and maintaining it. Background Technology

[0002] A converter is a crucial metallurgical device for smelting molten iron into steel, and its safe operation is vital to the stable production of the entire steelmaking process. The converter lining, consisting of high-temperature bricks laid inside the converter, serves as insulation and protection. During actual production, the working layer of the lining is in direct contact with the high-temperature molten metal, slag, and furnace gases within the furnace. Chemical reaction products at the working layer interface enter the slag. Operations such as charging, sampling, and tapping during the smelting process can all cause localized erosion of the lining bricks. When the lining thickness falls below the safe thickness, safety accidents are easily caused.

[0003] To improve the safety of each heat in the converter smelting process and prevent accidents such as burn-through and steel leakage, it is necessary to measure the effective thickness of the converter lining. Current measurements mostly use laser thickness gauges, requiring a specialist to move the instrument to the measurement position within a specific time frame. This method is relatively time-consuming and often involves intermittent measurements, typically taken every 7-10 heats or 1-2 days, leading to untimely tracking of the lining thickness. Furthermore, existing methods only measure the lining thickness and do not provide corresponding maintenance adjustments based on the thickness. Adjustments still rely on the operator's experience, resulting in inconsistent results and affecting the comprehensive and scientific control of the lining thickness. Summary of the Invention

[0004] Based on the above analysis, the present invention aims to provide a furnace lining thickness measuring device and a measuring and maintenance method to solve the problems of discontinuous furnace lining thickness measuring process, long process time, and untimely maintenance measures in the existing furnace lining thickness measuring process.

[0005] The objective of this invention is mainly achieved through the following technical solutions:

[0006] On the one hand, the present invention provides a furnace lining thickness measuring device, including a slide rail, a railcar, a laser thickness gauge, a robotic arm, and a controller;

[0007] The slide rail is a double rail track, with the two rail tracks parallel to each other, and is set in front of the firewall, including an outer rail and an inner rail;

[0008] The railcar travels on a slide rail and is equipped with a communication system, braking system, transport system and rail cleaning device.

[0009] The laser thickness gauge includes a thickness probe and a protective cover, the protective cover including a slag baffle and a cooling air curtain;

[0010] The robotic arm includes a lifting arm, a rotating arm, and a telescopic arm;

[0011] The controller is used to control the movements of the railcar, robotic arm, and laser thickness gauge, enabling remote control and automation of the furnace lining thickness measurement process.

[0012] Furthermore, the distance between the outer track and the inner track is 0.5 to 2m, and the distance between the inner track and the fire wall is 0.5 to 2m.

[0013] Furthermore, the lifting arm is fixed on the railcar, the two ends of the rotating arm are respectively connected to the lifting arm and the telescopic arm, one end of the telescopic arm is connected to the rotating arm, and the other end of the telescopic arm is connected to the laser thickness gauge.

[0014] The controller is communicatively connected to the railcar, the robotic arm, and the laser thickness gauge.

[0015] Furthermore, the slide rail is equipped with a positioning device to track the position of the track vehicle in real time during its movement.

[0016] The railcar is used to carry the robotic arm and the laser thickness gauge, transporting them from the waiting position to the measuring position.

[0017] The robotic arm is used to extend the laser thickness gauge from the sliding rail measuring position to the furnace mouth measuring point.

[0018] On the other hand, the present invention also provides a method for measuring and maintaining furnace lining thickness, which is accomplished by the aforementioned measuring device and includes the following steps:

[0019] Step 1: When the converter starts tapping and the converter tilt angle reaches -80°, the railcar starts, carrying the laser thickness gauge and robotic arm, and moves from the waiting position to the measuring position;

[0020] Step 2: When the converter tilt angle reaches -90°, the robotic arm starts and transports the laser thickness gauge to the measurement point. The cooling air curtain of the laser thickness gauge is opened, and the measurement begins.

[0021] Step 3: When the converter tilt angle reaches -100°, the measurement ends, the robotic arm retracts, the railcar moves from the measurement position to the waiting position, and the measurement result of the furnace lining thickness is transmitted to the controller through the communication system;

[0022] Step 4: The controller provides maintenance suggestions based on the measurement results of the furnace lining thickness;

[0023] Step 5: Perform converter lining maintenance according to the maintenance recommendations;

[0024] Step 6: After the converter lining maintenance is completed, the furnace is moved to the measuring position for a second thickness measurement;

[0025] Step 7: After the second thickness measurement is completed, the measurement result of the furnace lining thickness is transmitted to the controller to verify the effectiveness of the maintenance measures and optimize the maintenance process.

[0026] Furthermore, in step 2, the measurement point is the center of the small window of the fire baffle wall at the converter opening.

[0027] Furthermore, in step 4, the maintenance recommendations include:

[0028] When 0 < ΔH ≤ 100 mm, the normal maintenance process is adopted, which is slag splashing furnace protection. The slag splashing furnace protection process is to first pour out the slag and then splash the slag, with a slag retention amount of 50-80 kg / t steel.

[0029] Where ΔH is the furnace lining thickness, in mm.

[0030] Furthermore, in step 4, the maintenance recommendations also include:

[0031] When 100mm < ΔH < 200mm, a weak maintenance process is adopted, which is intermittent slag splashing furnace protection. The frequency of intermittent slag splashing furnace protection is 2 to 3 times, and the slag retention amount is 30 to 50 kg / t steel.

[0032] Furthermore, in step 4, the maintenance recommendations also include:

[0033] When ΔH≥200mm, a weak maintenance process is adopted, which is the furnace bottom lowering mode. The furnace bottom lowering mode means that there is no slag splashing during the smelting process, and the lance position is lowered by 100-200mm at the end of the oxygen blowing smelting.

[0034] Furthermore, in step 4, the maintenance recommendations also include:

[0035] When -100mm≤ΔH≤0, a strong maintenance process is adopted, which emphasizes slag splashing, first pouring slag, then adjusting slag, and then splashing slag, with a slag retention amount of 50~60kg / t and an slag adjustment amount of 5~10kg / t;

[0036] When -200mm≤ΔH<-100mm, a strong maintenance process is adopted. The strong maintenance process is a combination of splashing and furnace repair, the furnace repair intensity is 2 times / 10 furnaces, and the slag splashing is a strong slag splashing process.

[0037] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0038] 1. The measuring device and method of the present invention utilize the converter body time to complete the measurement of furnace lining thickness, furnace lining maintenance and re-measurement, realize continuous thickness measurement of furnace lining during converter smelting, with short measurement time and timely tracking of furnace lining thickness.

[0039] 2. This invention controls the laser thickness gauge to move from the waiting position to the measuring position when the furnace tilt angle reaches -80°, ensuring that the measurement starts when the converter tilt angle reaches -90°. It makes full use of the converter body time to complete the furnace lining thickness measurement. There is no need for a special person to push the thickness gauge to the measuring position to complete the measurement within a specific measurement time. The measurement time is relatively short, and the measurement can be carried out after any furnace cycle, which can track the furnace lining thickness in a timely manner.

[0040] 3. The present invention sets a reasonable distance between the outer and inner tracks, and between the inner track and the fire baffle, so that the thickness measuring probe of the laser thickness gauge can maintain a certain degree of freedom when the converter tilt angle reaches -80° to -100°, and can move freely with the robotic arm to complete the measurement of furnace lining thickness.

[0041] 4. The measuring device and method of the present invention can provide corresponding maintenance process adjustments based on the measurement results of the furnace lining thickness, and verify the maintenance results by re-measuring, thereby optimizing the maintenance process and realizing rapid and efficient maintenance of the furnace lining thickness.

[0042] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0043] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0044] Figure 1 This is a schematic diagram of the furnace bottom thickness side thickness device according to an embodiment of the present invention;

[0045] Figure 2 This is a schematic diagram of the longitudinal section of the laser thickness gauge of the present invention;

[0046] Figure 3 This is a thickness measurement result diagram of an embodiment of the present invention;

[0047] Figure 4 This is a diagram showing the secondary side thickness result of an embodiment of the present invention.

[0048] Figure label:

[0049] 1-Controller; 2-Control cabinet; 3-Slide rail; 4-Rail car; 5-Lifting arm; 6-Rotating arm; 7-Telescopic arm; 8-Firewall; 9-Converter; 10-Laser thickness gauge; 11-Laser thickness gauge probe; 12-Cooling air curtain; 13-Slag baffle; 14-Protective cover. Detailed Implementation

[0050] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0051] The present invention provides a furnace lining thickness measuring device, which is a mobile automatic thickness gauge, including a slide rail, a railcar, a laser thickness gauge, a robotic arm and a controller;

[0052] The slide rail is a double-rail track, set in front of the firewall, including an outer track and an inner track, with a distance of 0.5 to 2 meters between the outer and inner tracks. The double rails are parallel to each other, and the direction of the slide rail extension is parallel to the firewall. The distance between the inner track and the firewall is 0.5 to 2 meters. A positioning device is installed on the slide rail, which can realize real-time tracking of the position of the track vehicle during its movement.

[0053] The railcar travels on a slide rail, carrying a robotic arm and a laser thickness gauge, transporting them from the waiting position to the measuring position. It is equipped with a communication system, a braking system, a transport system, and a track cleaning device. The communication system enables remote communication between the railcar and the controller; the braking system controls the movement of the railcar; the transport system carries the robotic arm and laser thickness gauge; and the track cleaning device removes dirt and debris from the slide rail, increasing the contact area between the railcar wheel and the rail, reducing the coefficient of friction, thereby reducing the railcar's sliding resistance and improving its operating speed and efficiency.

[0054] The laser thickness gauge includes a thickness probe and a protective cover. The protective cover includes a slag baffle and a cooling air curtain. Under the protection of the protective cover, the thickness of the converter lining is measured.

[0055] The robotic arm includes a lifting arm, a rotating arm, and a telescopic arm. The lifting arm is fixed on the railcar and can be raised and lowered freely. The two ends of the rotating arm are connected to the lifting arm and the telescopic arm respectively, and can rotate 360° to drive the telescopic arm to rotate. One end of the telescopic arm is connected to the rotating arm, and the other end of the telescopic arm is connected to the laser thickness gauge. Through the overall coordinated operation of the robotic arm, the laser thickness gauge is extended from the sliding rail measurement position to the furnace mouth measurement point.

[0056] The controller is used to control the movement of the railcar, robotic arm and laser thickness gauge to realize remote control and automation of the furnace lining thickness measurement process. The controller is communicatively connected to the railcar, robotic arm and laser thickness gauge.

[0057] The measuring device may also include a control cabinet with a power supply that is wired to the railcar, robotic arm, and laser thickness gauge to provide energy for their operation.

[0058] The present invention also provides a method for measuring and maintaining furnace lining thickness, which is implemented by the aforementioned furnace lining thickness measuring device and includes the following steps:

[0059] Step 1: When the converter starts tapping and the converter tilt angle reaches -80°, the railcar starts, carrying the laser thickness gauge and robotic arm, and moves from the waiting position to the measuring position;

[0060] Step 2: When the converter tilt angle reaches -90°, the robotic arm starts and transports the laser thickness gauge to the measurement point. The cooling air curtain of the laser thickness gauge is opened, and the measurement begins.

[0061] Step 3: When the converter tilt angle reaches -100°, the measurement ends, the robotic arm retracts, the railcar moves from the measurement position to the waiting position, and the measurement result is transmitted to the controller;

[0062] Step 4: The controller provides maintenance suggestions based on the measurement results;

[0063] Step 5: Perform converter lining maintenance according to the maintenance recommendations;

[0064] Step 6: After the converter lining maintenance is completed, the furnace is moved to the measuring position for a second thickness measurement;

[0065] Step 7: After the second thickness measurement is completed, the thickness measurement results are transmitted to the controller to verify the effectiveness of the maintenance measures and optimize the maintenance process.

[0066] Specifically, in step 1, the railcar travels at a speed of 1-1.5 m / s to ensure that the railcar carrying the laser thickness gauge and the robotic arm reaches the measurement position before the converter tilt angle reaches -90°; the measurement position is the position of the railcar on the slide rail that enables the robotic arm to transport the laser thickness gauge to the measurement point.

[0067] Specifically, in step 2, the measurement point is the center of the small window of the fire baffle wall at the converter opening.

[0068] Specifically, in step 4, the controller provides maintenance suggestions based on the measurement results: the measurement result is the furnace lining thickness ΔH, which is the difference between the furnace bottom height and the historical lowest furnace lining thickness;

[0069] When 0 < ΔH ≤ 100 mm, the normal maintenance process is adopted, which is slag splashing furnace protection. The slag splashing furnace protection process is to first pour out the slag and then splash the slag, with a slag retention amount of 50-80 kg / t steel.

[0070] When 100mm < ΔH < 200mm, a weak maintenance process is adopted, which is intermittent slag splashing furnace protection. The frequency of intermittent slag splashing furnace protection is 2 to 3 times, and the slag amount left for slag splashing furnace protection is 30 to 50 kg / t steel.

[0071] When ΔH≥200mm, a weak maintenance process is adopted, which is the furnace bottom lowering mode. The furnace bottom lowering mode means that there is no slag splashing during the smelting process, and the lance position is lowered by 100-200mm at the end of the oxygen blowing smelting process.

[0072] When -100mm≤ΔH≤0, a strong maintenance process is adopted, which emphasizes slag splashing, first pouring slag, then adjusting slag, and then splashing slag, with a slag retention amount of 50~60kg / t and an slag adjustment amount of 5~10kg / t;

[0073] When -200mm≤ΔH<-100mm, a strong maintenance process is adopted. The strong maintenance process is a combination of splashing and furnace repair, the furnace repair intensity is 2 times / 10 furnaces, and the slag splashing is a strong slag splashing process.

[0074] The method of this invention utilizes the converter body time to achieve continuous thickness measurement and rapid, efficient maintenance of the furnace lining during the converter smelting process through furnace lining thickness measurement, furnace lining maintenance, and re-measurement.

[0075] Example 1

[0076] This embodiment provides a furnace lining thickness measuring device, such as... Figure 1 As shown, the device is a mobile automatic thickness gauge, including a slide rail, a railcar, a laser thickness gauge, a robotic arm, and a controller;

[0077] The slide rail is a double-rail track, installed in front of the firewall, including an outer track and an inner track, with a distance of 2m between the outer track and the inner track. The double rails are parallel to each other, and the direction of the slide rail is parallel to the firewall. The distance between the inner track and the firewall is 1m. A positioning device is installed on the slide rail.

[0078] The railcar travels on a slide rail and is equipped with a communication system, braking system, transport system and track cleaning device to carry the robotic arm and laser thickness gauge, and to transport the robotic arm and laser thickness gauge from the waiting position to the measuring position.

[0079] The laser thickness gauge includes a thickness probe and a protective cover, the protective cover including a slag baffle and a cooling air curtain;

[0080] The robotic arm includes a lifting arm, a rotating arm, and a telescopic arm. The telescopic arm is connected to a laser thickness gauge. Through the overall coordinated operation of the robotic arm, the laser thickness gauge is extended from the slide rail measuring position to the furnace mouth measuring point.

[0081] The control cabinet contains a power supply, which is connected to the railcar, robotic arm and laser thickness gauge by wires.

[0082] The controller is used to control the movements of the railcar, robotic arm, and laser thickness gauge, enabling remote control and automation of the furnace lining thickness measurement process.

[0083] Example 2

[0084] The furnace lining thickness is measured and maintained using the furnace lining thickness measuring device provided in Example 1, including the following steps:

[0085] Step 1: When the converter starts tapping and the converter tilt angle reaches -80°, the railcar starts, carrying the laser thickness gauge and robotic arm, and moves from the waiting position to the measuring position;

[0086] The distance to the fire wall where the measurement was taken was 1m;

[0087] Step 2: When the converter tilt angle reaches -90°, the robotic arm starts and transports the laser thickness gauge to the measurement point. The cooling air curtain of the laser thickness gauge is opened, and a thickness measurement begins.

[0088] The measurement point is the center of the small window in the firebreak wall at the converter opening; Figure 1 The image shows the converter tilt angle at -95°.

[0089] Step 3: When the converter tilt angle reaches -100°, the thickness measurement is completed, the robotic arm is retracted, the railcar moves from the measurement position to the waiting position, and the measurement result is transmitted to the controller through the communication system;

[0090] The measurement results are as follows: the furnace lining thickness ΔH (the difference between the furnace bottom height and the historical lowest furnace lining thickness) is 200 mm;

[0091] Step 4: The controller receives the value of the furnace lining thickness ΔH and, based on the value of the furnace lining thickness ΔH, gives the maintenance suggestion of adopting the furnace bottom lowering mode in the weak maintenance process. The furnace bottom lowering mode is that there is no slag splashing during the smelting process and the lance position is lowered by 150mm at the end of the oxygen blowing smelting process.

[0092] Step 5: Perform maintenance on the converter lining according to the maintenance recommendations;

[0093] Step 6: After the converter lining maintenance is completed, the furnace is moved to the measuring position for a second thickness measurement;

[0094] The second thickness measurement results are: furnace lining thickness ΔH = 250mm, which meets the requirements for converter smelting;

[0095] Step 7: After the second thickness measurement is completed, the thickness measurement results are transmitted to the controller to verify the effectiveness of the maintenance measures and optimize the maintenance process.

[0096] Comparing the results of primary and secondary side thickness, it can be seen that after maintenance measures such as no slag splashing during the smelting process and a 150mm reduction in the lance position at the end of oxygen blowing smelting, the thickness of the furnace lining increases, the furnace bottom thickness is maintained within a certain range, the safety of the furnace lining can be guaranteed, the converter operating rate will be greatly improved, and the consumption of refractory materials will be effectively reduced.

[0097] Unlike existing methods where a specialist pushes the thickness measuring instrument to the measuring position within a specific time frame to complete the thickness measurement, this embodiment utilizes the converter body to synchronously measure the furnace lining thickness. Through furnace lining thickness measurement, furnace lining maintenance, and re-measurement, continuous thickness measurement and rapid, efficient maintenance are achieved in every furnace during the converter smelting process.

[0098] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A furnace lining thickness measuring device, characterized in that, Includes slide rails, railcars, laser thickness gauges, robotic arms, and controllers; The slide rail is a double rail track, with the two rail tracks parallel to each other, and is set in front of the firewall, including an outer rail and an inner rail; The railcar travels on a slide rail and is equipped with a communication system, a braking system, a transport system and a rail cleaning device. The laser thickness gauge includes a thickness probe and a protective cover, the protective cover including a slag baffle and a cooling air curtain; The robotic arm includes a lifting arm, a rotating arm, and a telescopic arm; The controller is used to control the movements of the railcar, robotic arm and laser thickness gauge, so as to realize remote control and automation of the furnace lining thickness measurement process; The lifting arm is fixed on the railcar. The two ends of the rotating arm are connected to the lifting arm and the telescopic arm, respectively. One end of the telescopic arm is connected to the rotating arm, and the other end of the telescopic arm is connected to the laser thickness gauge. The controller is communicatively connected to the railcar, the robotic arm, and the laser thickness gauge. The slide rail is equipped with a positioning device to track the position of the railcar in real time during its movement. The railcar is used to carry the robotic arm and the laser thickness gauge, transporting them from the waiting position to the measuring position. The robotic arm is used to extend the laser thickness gauge from the sliding rail measuring position to the furnace mouth measuring point.

2. The measuring device according to claim 1, characterized in that, The distance between the outer and inner tracks is 0.5~2m, and the distance between the inner track and the fire wall is 0.5~2m.

3. A method for measuring and maintaining furnace lining thickness, characterized in that, The measurement is performed using the measuring device described in claim 1 or 2, and includes the following steps: Step 1: When the converter starts tapping and the converter tilt angle reaches -80°, the railcar starts, carrying the laser thickness gauge and robotic arm, and moves from the waiting position to the measuring position; Step 2: When the converter tilt angle reaches -90°, the robotic arm starts and transports the laser thickness gauge to the measurement point. The cooling air curtain of the laser thickness gauge is opened, and the measurement begins. Step 3: When the converter tilt angle reaches -100°, the measurement ends, the robotic arm retracts, the railcar moves from the measurement position to the waiting position, and the measurement result of the furnace lining thickness is transmitted to the controller through the communication system; Step 4: The controller provides maintenance suggestions based on the measurement results of the furnace lining thickness; Step 5: Perform converter lining maintenance according to the maintenance recommendations; Step 6: After the converter lining maintenance is completed, the furnace is moved to the measuring position for a second thickness measurement; Step 7: After the second thickness measurement is completed, the thickness measurement results of the furnace lining are transmitted to the controller to verify the effectiveness of the maintenance measures and optimize the maintenance process.

4. The measurement and maintenance method according to claim 3, characterized in that, In step 2, the measurement point is the center of the small window of the fire baffle wall at the converter opening.

5. The measurement and maintenance method according to claim 4, characterized in that, In step 4, the maintenance recommendations include: When 0 < ΔH ≤ 100 mm, the normal maintenance process is adopted, which is slag splashing furnace protection. The slag splashing furnace protection process is to first pour out the slag and then splash the slag, with a slag retention amount of 50~80 kg / t steel. Where ΔH is the furnace lining thickness, in mm.

6. The measurement and maintenance method according to claim 5, characterized in that, In step 4, the maintenance recommendations also include: When 100mm < ΔH < 200mm, weak maintenance process I is adopted. The weak maintenance process I is intermittent slag splashing furnace protection. The frequency of intermittent slag splashing furnace protection is 2 to 3 times, and the slag retention amount of slag splashing furnace protection is 30 to 50 kg / t steel.

7. The measurement and maintenance method according to claim 6, characterized in that, In step 4, the maintenance recommendations also include: When ΔH≥200mm, weak maintenance process II is adopted. The weak maintenance process II is the furnace bottom lowering mode. The furnace bottom lowering mode is to prevent slag splashing during the smelting process and to lower the lance position by 100~200mm at the end of the oxygen blowing smelting.

8. The measurement and maintenance method according to claim 7, characterized in that, In step 4, the maintenance recommendations also include: When -100mm≤ΔH≤0, strong maintenance process I is adopted. The strong maintenance process I emphasizes slag splashing, first pouring slag, then adjusting slag, and then splashing slag. The amount of slag left is 50~60kg / t, and the amount of slag adjusted is 5~10kg / t. When -200mm≤ΔH<-100mm, strong maintenance process II is adopted. The strong maintenance process II is a combination of splashing and furnace repair process, and the furnace repair intensity is 2 times / 10 furnace times.

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