A method for detecting the deviation of oxygen lance and an installation method for oxygen lance lifting track

Abstract

The invention discloses a method for detecting the deviation of an oxygen lance and a method for installing an oxygen lance lifting track, which belong to an installation detection method for oxygen converter steelmaking equipment. The method for detecting the deviation of an oxygen lance comprises detecting the verticality offset and the offset direction of the left and right tracks of an oxygen lance lifting trolley, and confirming the maximum gap between the lifting trolley and the two tracks according to the designed gap between the lifting trolley wheel and the track, and confirming the offset direction of the oxygen lance when the lifting trolley moves up and down when the track is offset. Finally, the offset size of the oxygen lance is calculated by the offset size of the lifting trolley using the proportionality principle of similar triangles. A method for installing an oxygen lance lifting track is also provided, which can determine the offset of the oxygen lance according to the verticality offset of the track, and determine the installation method of the oxygen lance lifting track according to the relationship between the gap between the lifting trolley wheel and the track and the oxygen lance offset, so as to avoid the oxygen lance offset affecting the performance and output of steelmaking.

Description

Technical Field

[0001] The invention belongs to an installation detection method for oxygen converter steelmaking equipment, and in particular relates to a method for detecting the deviation amount of an oxygen lance and an installation method for an oxygen lance lifting track. Background Art

[0002] The oxygen lance lifting and lateral movement is a key equipment in steelmaking production and one of the most unstable equipment in steelmaking production. The position of the oxygen lance must be well controlled to ensure a smooth steelmaking process. During the entire blowing process, the distance between the oxygen lance head and the liquid surface of the converter molten pool (called relative height) is constantly changing. Several different relative heights are set according to the initial, middle and final stages of blowing. The process requires that the oxygen lance can be freely raised and lowered during the blowing process, and is controlled according to the specified oxygen lance lifting speed curve, and can accurately stop at the specified position, requiring high positioning accuracy and reliable safety performance.

[0003] Due to the harsh working environment of oxygen lance equipment, it is often prone to failure. In addition, the oxygen lance track is a welded part with a large size. In the process of eliminating internal stress, the internal stress is often not completely eliminated. The fixation of the track and the factory building is often completed by welding, and there is a certain welding stress. In this way, the stress is released during the production process, causing the track to deform and change in size, affecting the accuracy and having a great impact on the operation and commissioning of the equipment.

[0004] In the prior art, every time the converter steelmaking production is resumed, the oxygen lance deviates during the operation of the oxygen lance lifting trolley, and the deviation is regular when rising and falling. When the lifting trolley rises and falls, the oxygen lance regularly deviates to the left or right, affecting the injection direction of the oxygen lance. For example, if the injection angle of the oxygen lance deviates and sprays toward the inner wall of the converter, it will not only affect the performance and output of the converter steelmaking, but may also affect the inside of the converter and affect the performance of the converter, posing a certain risk. Summary of the invention

[0005] In order to address the deficiencies in the above-mentioned background technology, the present invention provides a method for detecting the deviation of the oxygen lance, and can determine the offset of the oxygen lance according to the offset between the lifting trolley and the track. At the same time, it also provides a method for installing the oxygen lance lifting track to avoid the deviation of the oxygen lance affecting the performance and output of the converter joint defense, ensuring that the offset of the oxygen lance is within the specified deviation range, and ensuring the normal production of converter steelmaking.

[0006] In order to achieve the above purpose, the present invention provides a method for detecting the deviation of the oxygen lance, which is characterized by: detecting the verticality offset and the offset direction of the left and right tracks of the oxygen lance lifting trolley; at the same time, according to the preset design gap between the lifting trolley wheel and the track, under the condition of different offsets of the tracks on both sides, confirming the maximum gap between the lifting trolley and the two tracks in each case; under the condition of different offsets of the tracks on both sides, confirming the offset direction of the oxygen lance when the lifting trolley moves up and down in each case; using the proportional principle of similar triangles, the offset size of the oxygen lance is calculated through the maximum gap between the lifting trolley and the track; finally, according to the data between the gap between the lifting trolley and the tracks on both sides and the offset size of the oxygen lance, the relationship between the gap between the lifting trolley and the tracks on both sides and the offset size of the oxygen lance is obtained, including the following steps:

[0007] 1. The track of the lifting trolley is divided into left and right sides. The offset and offset direction of the left and right tracks are detected. There are four different offset situations, and the preset design gap between the wheels of the lifting trolley and the tracks on both sides is confirmed; there are two tracks of the lifting trolley, and its offset direction is divided into left offset and right offset. There are four different combinations of situations. Similarly, the offset directions of the oxygen lances corresponding to the four situations are also different, and the changes in the offset directions of the lifting trolley during lifting are also different, namely: the verticality of the left track deflects to the right, and the right track also deflects to the right. As the lifting trolley descends, the lifting trolley tilts clockwise and the oxygen lance tilts to the left; the verticality of the left track deflects to the left, and the right track deflects to the right. As the lifting trolley descends, the lifting trolley tilts clockwise and the oxygen lance tilts to the left; the verticality of the left track deflects to the right, and the right track also deflects to the left. As the lifting trolley descends, the lifting trolley tilts clockwise and the oxygen lance tilts to the left; the verticality of the left track deflects to the right, and the right track also deflects to the left. As the lifting trolley descends, the lifting trolley tilts counterclockwise and the oxygen lance tilts to the right. Preferably, the preset design gap between the lifting trolley wheel and the track is set to 8 mm, that is, in an ideal state, the distance between the wheels on both sides of the lifting trolley and the tracks on both sides is 8 mm;

[0008] 2. According to the different conditions of the tracks on both sides and the preset design gap, the maximum gap between the lifting trolley and the tracks on both sides in different situations is determined; the four different offset conditions are combined with the design gap between the lifting trolley wheels and the tracks on both sides, and the four different maximum gaps between the lifting trolley wheels and the tracks on both sides can be calculated, and the maximum gap will appear at the top or bottom of the track in different situations;

[0009] 3. After confirming the maximum gap between the lifting trolley and the tracks on both sides, confirm the offset direction of the oxygen gun on the lifting trolley according to the offset direction of the tracks on both sides, and confirm the change of the offset direction of the oxygen gun as the lifting trolley rises and falls;

[0010] 4. After confirming the offset direction of the tracks on both sides and the offset direction of the oxygen lance, the upper and lower wheels on one side of the lifting trolley and the track on one side form two sides of a right triangle, and the oxygen lance and the center line of the oxygen lance in an ideal state also form two sides of a right triangle. The two triangles are similar triangles. Using the proportional principle of similar triangles, the offset size of the oxygen lance can be calculated through the offset size and proportion of the lifting trolley; because the lifting trolley is small in size, its offset size can be easily measured, and then the maximum offset size of the oxygen lance can be calculated using the proportional principle of similar triangles;

[0011] 5. After confirming the maximum gap between the two rails and the lifting trolley and the offset size of the oxygen lance, finally calculate the relationship between the maximum gap between the two rails and the lifting trolley and the offset size of the oxygen lance. Based on the data of two dimensions in four cases, the relationship between the maximum gap between the two rails and the lifting trolley and the offset size of the oxygen lance can be obtained.

[0012] The present invention also provides an installation method for an oxygen gun lifting track, which is characterized by: first detecting the straightness tolerance of the two lifting tracks, and after the inspection is qualified, the two lifting tracks are virtually divided into a number of sections, each section length is less than the wheelbase length of the upper and lower wheels of the lifting trolley, and the number of sections should be greater than 10 sections, so as to ensure that the measured value of each section is representative and can reflect the verticality tolerance of the entire track, and then the maximum gap between the wheels of the lifting trolley and the tracks on both sides is detected within the range of each section according to the divided sections, and the offset of the oxygen gun is confirmed according to the relationship between the maximum gap between the tracks on both sides and the lifting trolley and the offset size of the oxygen gun. If the offset size of the oxygen gun is within the offset range within each divided section, the track and the plant structure are fixed and spot welded; if it is not within the offset range, the track is corrected and then fixed and spot welded.

[0013] Furthermore, the track should be welded symmetrically during fixed spot welding, and the track should be knocked after each welding rod to eliminate internal stress. Using symmetrical welding can effectively prevent deformation caused by welding, and knocking the track after welding can eliminate welding stress and further reduce deformation.

[0014] Furthermore, the correction operation that is not within the offset range uses triangular local heating correction, and the reverse deformation principle can be used for correction during welding to meet the offset range of the oxygen gun.

[0015] Based on the above method, the present invention provides a method for detecting the deviation of the oxygen lance and a method for installing the oxygen lance lifting track, which provides a method for determining the offset of the oxygen lance according to the vertical offset of the track to determine whether the offset of the oxygen lance meets the requirements, and at the same time, determines the installation method of the oxygen lance lifting track according to the relationship between the gap between the lifting trolley wheel and the track and the oxygen lance offset, so as to avoid the oxygen lance offset affecting the performance and output of steelmaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the device layout principle of a method for detecting oxygen lance deviation provided by the present invention.

[0017] Figure 2 A schematic diagram of the principle of an installation method for an oxygen lance lifting track provided by the present invention.

[0018] Figure 3 It is a cross-sectional view of the schematic assembly diagram of the oxygen lance and the nitrogen sealing seat in the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and beneficial effects of the present invention more clearly understood, the technical solution of the present invention is now described in more detail with reference to the accompanying drawings.

[0020] Embodiment: A method for detecting the deviation of an oxygen lance and a method for installing an oxygen lance lifting track provided by the present invention were used in a steelmaking plant in Shanxi.

[0021] Project Overview: When the site resumed work and production, the oxygen lance deviated during the lifting process of the oxygen lance lifting trolley, and the deviation was regular during the rise and fall. When the lifting trolley descended, the oxygen lance gradually shifted to the left, and hit the left side of the nitrogen seal port during the process of entering the nitrogen seal port; when the oxygen lance was lifted out of the nitrogen seal port, the oxygen lance gradually moved to the right, and when the oxygen lance head was lifted out of the nitrogen seal port, it hit the right side of the nitrogen seal port, and then gradually returned to the starting state.

[0022] After inspection, the left track of the lifting trolley has a straightness tolerance of 1.0mm and a verticality tolerance of 3.0mm. The left track meets the technical requirements; the right track has a straightness tolerance of 1.0mm and a verticality tolerance of 5.0mm, which exceeds the specification requirements. The reasons for the deviation of the oxygen lance in several cases and the reasons for the deviation of the oxygen lance are analyzed as follows:

[0023] like Figure 1 , because the oxygen gun water and air pipes are on the right side of the track, and the metal hose is added with the medium gravity, the oxygen gun lifting trolley wheels B and C are close to the inner side of the tracks on both sides. Because there is an 8mm gap in the design, the oxygen gun lifting trolley wheels A and D are 8mm apart from the tracks on both sides in an ideal state, that is, the ideal gap with the lifting trolley when the shape and position tolerances of the tracks on both sides are not considered, but there will be deviations on both sides of the track in reality. Because the straightness tolerance of the left and right tracks is 1mm, which is a shape tolerance and the value is small, it can be considered that the straightness tolerance is included in the verticality tolerance range, and the straightness tolerance can be considered negligible, that is, the tracks on both sides are "absolutely" straight, so the verticality tolerance is either above or below. The two tolerance distribution theory analysis principles are the same.

[0024] The verticality tolerance of the oxygen lance track of a steel plant in Shanxi Province is 3mm and 5mm on the left and right sides respectively within the entire length of the track. In order to fully understand the influence of the shape and position tolerance of the tracks on both sides on the deflection of the oxygen lance, the shape and position tolerance of the oxygen lance track of a steel plant in Shanxi Province is taken as the starting point to explain one by one the various forms of coordination of the tracks on both sides due to the uncertainty of the direction of the verticality tolerance of the tracks.

[0025] Form 1: When the verticality tolerance of the left track deviates to the right and the right track also deviates to the right, according to the actual detection, the verticality tolerance of the left side is 3mm and the verticality tolerance of the right side is 5mm, then the maximum clearance C between the two tracks and the lifting trolley is 0max =5-3+8=10mm, that is, the gap gradually increases from top to bottom. The lifting trolley acts to the right due to the existence of the metal hose and the medium gravity, so that the oxygen gun lifting trolley wheel B / C is close to the track. During the descent of the lifting trolley, due to the gradual increase in the gap, the lifting trolley tilts clockwise, that is, the lifting trolley tilts to the right, the oxygen gun tilts to the left, and the oxygen gun head scrapes against the lower edge on the left when entering the nitrogen sealing port. When the lifting trolley rises, due to the gradual decrease in the gap, the lifting trolley gradually rotates counterclockwise, the deflection of the oxygen gun gradually recovers to the right, and finally the lifting trolley and the oxygen gun gradually return to their original state.

[0026] Form 2: When the left track is tilted to the left and the right track is tilted to the right, the maximum clearance between the two tracks and the lifting trolley is C 0max =3+5+8=16mm, that is, the gap gradually increases as the lifting trolley descends, the gap between wheels A, D and the track gradually increases, the lifting trolley tilts clockwise, that is, the lifting trolley tilts to the right, the oxygen gun tilts to the left, and when it descends to the bottom, the lifting trolley has the largest gap, the largest degree of inclination, and the largest deflection of the oxygen gun.

[0027] Form 3: When the left track is tilted to the right and the right track is tilted to the left, the minimum clearance between the track and the lifting trolley is C 0min =8-3-5=0mm, that is, as the lifting trolley descends, there is gradually no gap between the tracks on both sides and the lifting trolley, so the lifting trolley cannot move. This situation does not conform to the actual situation on site, so it is omitted.

[0028] Form 4: When the left track is vertically deflected to the left and the right track is also deflected to the left, the minimum clearance between the two tracks and the lifting trolley is C 0min =3+8-5=6mm, that is, the gap gradually decreases as the lifting trolley descends, the gap between wheels A, D and the tracks on both sides gradually decreases, the lifting trolley tilts counterclockwise, that is, the lifting trolley rotates to the left, the oxygen gun tilts to the right, and the tilt is the largest when the lifting trolley is at the bottom.

[0029] Calculate the deflection of the oxygen lance according to the above four different forms, such as Figure 1 As shown:

[0030] Form 1, according to the similarity between Δefg and ΔEFG, then eg / fg=EG / FG, then the total deflection of the oxygen lance head FG=EG*fg / eg; then FG=19.177*0.010 / 1.9=0.1009m (the values ​​are all obtained from actual measurements), that is, the oxygen lance is in the maximum deflection state at the bottom, deflecting to the left, and the maximum deflection is 100.9mm;

[0031] Form 2, similarly FG = 19.177*0.016 / 1.9 = 161.49 mm, that is, the oxygen gun is at the maximum deflection state at the bottom, deflecting to the left, and the maximum deflection is 161.49 mm;

[0032] Form 3: Since there is no gap in Form 3, the lifting trolley cannot be lifted, and the oxygen gun will not rotate or deflect;

[0033] Form 4, similarly FG = 19.177*0.006 / 1.9 = 60.56 mm, that is, the oxygen gun is at the maximum deflection state at the bottom, deflecting to the right, and the maximum deflection is 60.56 mm.

[0034] As shown in Table 1, the relationship between the gap between the track and the wheel of the lifting trolley and the offset of the oxygen lance head is: offset of the oxygen lance head = gap between the track and the wheel of the lifting trolley * 10.09.

[0035] Table 1: Relationship between the gap between the rails on both sides and the lifting trolley and the deflection of the oxygen lance

[0036] Serial number Track error type Maximum clearance between rail and lifting trolley Maximum deflection of oxygen lance tip 1 Form 1 10mm 100.9 2 Form 2 16mm 161.49 3 Form 3 0mm - 4 Form 4 6mm 60.56

[0037] This relationship is related to the upper and lower wheelbases of the oxygen lance lifting trolley and the length of the oxygen lance. That is, when the verticality tolerance of the tracks on both sides affects the gap between the track and the lifting trolley, it will cause the oxygen lance to deflect. As the gap changes, the deflection of the oxygen lance changes accordingly.

[0038] As shown in Table 2, according to the deflection in different forms, the relationship between the lifting trolley and the deflection direction of the oxygen lance can be obtained:

[0039] Table 2: Relationship between the lifting trolley and the deflection direction of the oxygen lance

[0040] Serial number Track error type Descending deflection direction Rising deflection direction 1 Form 1 left Restore Right 2 Form 2 left Restore Right 3 Form 3 No movement No movement 4 Form 4 To the right Restore Left

[0041] After confirming the relationship between the gap between the rails on both sides and the wheels of the lifting trolley and the deviation of the oxygen gun head, we started to remake and install two new lifting trolley rails. The project was also implemented in a steel plant in Shanxi.

[0042] Two straight rails were selected for making the track, both with a length of 4m. The straightness tolerance was measured and tested to be 1mm, which would not affect the installation and commissioning of the oxygen gun. The upper and lower wheelbase length h0 of the lifting trolley installed on the track was 0.3m.

[0043] Then place the two fixed rails in parallel, simply fix the two rails according to the normal installation method, and place the lifting trolley on the two rails, and then divide the two fixed rails into 14 sections, namely M0-M0; N0-N0; O0-O0...Y0-Y0; Z0-Z0, and the length L of each section is 0.29m. Figure 2 , then measure the effective clearance between the lifting trolley wheel and the track within each length range, as shown in Table 3:

[0044] Table 3: Statistics of effective clearance between wheels and tracks of lifting trolleys in different ranges

[0045] Segmentation Effective gap / mm <![CDATA[M0-M0]]> 0.84 <![CDATA[N0-N0]]> 0.85 <![CDATA[O0-O0]]> 1.23 <![CDATA[P0-P0]]> 0.90 <![CDATA[Q0-Q0]]> 0.95 <![CDATA[R0-R0]]> 0.83 <![CDATA[S0-S0]]> 1.45 <![CDATA[T0-T0]]> 0.69 <![CDATA[U0-U0]]> 0.74 <![CDATA[V0-V0]]> 0.83 <![CDATA[W0-W0]]> 1.34 <![CDATA[X0-X0]]> 0.73 <![CDATA[Y0-Y0]]> 0.88 <![CDATA[Z0-Z0]]> 1.17

[0046] Since the oxygen lance needs to be connected to the nitrogen seal seat, if the oxygen lance deviates, it will collide with the nitrogen seal port, which will affect the use of the oxygen lance and the life of the nitrogen seal port. Therefore, the offset of the oxygen lance is limited according to the size of the nitrogen seal port, such as Figure 3 , where φ1 is the upper diameter of the nitrogen sealing port, φ2 is the diameter of the oxygen gun, and φ3 is the lower diameter of the nitrogen sealing port, φ1 = 426mm, φ2 = 245mm, and φ3 = 616mm. The oxygen gun must not bump into the nitrogen sealing port when entering the nitrogen sealing port, so the maximum deviation of the oxygen gun does not exceed (426-245) / 2 = 181 / 2 = 90.5mm, that is, the gap between the two sides of the track and the lifting trolley does not exceed 90.5 / 10.09 = 8.96mm, that is, when the oxygen gun head just enters the nitrogen sealing port, the gap between the track and the lifting trolley at the position where the lifting trolley is located is 8.96mm, minus the design gap of 8mm, so the effective gap between the lifting trolley wheel and the two sides of the track is 0.96mm, that is, the maximum verticality tolerance of the two sides of the track at the position of the lifting trolley is 0.96mm. As the oxygen gun continues to descend, the nitrogen sealing plug guide comes into play, and the allowable deviation due to the nitrogen sealing guide is (616-426) / 2=190 / 2=95mm. Similarly, when the nitrogen sealing plug falls on the nitrogen sealing seat, the gap between the two side tracks and the lifting trolley is 95 / 10.09=9.42mm. After removing the designed gap of 8mm, the maximum verticality tolerance of the two side tracks at the position of the lifting trolley can only be 1.42mm. Therefore, in order to ensure that the deviation of the oxygen gun does not affect the normal operation of the sintering process, and the oxygen gun does not cause the nitrogen sealing port of the nitrogen sealing seat to collide, when making and installing the new track, ensure that everything is in the minimum gap, which will neither affect the normal operation of the sintering process nor cause the lifting trolley to jam. Therefore, the maximum verticality tolerance of the entire track cannot exceed 0.96mm.

[0047] Therefore, in the above measurement results, there are four sections where the effective gap exceeds the range, so these four sections need to be corrected. The correction method uses triangular local heating correction. Triangular heating correction means that the heating area is triangular, and the heated part is the flange of the bent and deformed structural part. The base of the triangle is at the edge of the corrected part, and the vertex faces inward. The track within the above four sections is corrected, and the effective gap between the lifting trolley wheel and the track is measured within each length range after correction as shown in Table 4:

[0048] Table 4: Statistics of effective clearance between wheels and tracks of lifting trolleys in different sections after deviation correction

[0049] Segmentation Effective gap / mm <![CDATA[M0-M0]]> 0.84 <![CDATA[N0-N0]]> 0.85 <![CDATA[O0-O0]]> 0.87 <![CDATA[P0-P0]]> 0.90 <![CDATA[Q0-Q0]]> 0.95 <![CDATA[R0-R0]]> 0.83 <![CDATA[S0-S0]]> 0.76 <![CDATA[T0-T0]]> 0.69 <![CDATA[U0-U0]]> 0.74 <![CDATA[V0-V0]]> 0.83 <![CDATA[W0-W0]]> 0.92 <![CDATA[X0-X0]]> 0.73 <![CDATA[Y0-Y0]]> 0.88 <![CDATA[Z0-Z0]]> 0.96

[0050] As can be seen from the table above, the effective gap of each range after correction is within the range, which has met the normal production needs, and does not affect the normal operation of the sintering process, nor does it cause the lifting trolley to jam. Therefore, the two rails can be welded at this time. The welding is symmetrical, and each rail is welded by two people at the same time. When welding, welding deformation should be considered and avoided by using the reverse deformation principle. Spot welding is used for welding. After welding each electrode, the rail needs to be knocked to eliminate welding stress and prevent deformation.

[0051] Through the above method, the offset direction of the oxygen lance can be confirmed and its offset can be calculated according to different situations. It can be confirmed whether the offset of the oxygen lance affects the debugging and normal use of the oxygen lance. An installation method for the oxygen lance lifting track is provided to avoid the oxygen lance offset affecting the performance and output of steelmaking.

Claims

1. A method for detecting the deviation of an oxygen lance, characterized in that: Detect the verticality offset and direction of the left and right tracks of the oxygen gun lifting trolley; at the same time, according to the preset design gap between the lifting trolley wheel and the track, confirm the maximum gap between the lifting trolley and the two tracks in each case under different offset conditions of the tracks on both sides; confirm the direction of the offset of the oxygen gun when the lifting trolley moves up and down in each case under different offset conditions of the tracks on both sides; there are four different offset conditions on the left and right tracks: the verticality of the left track deviates to the right, and the right track also deviates to the right. As the lifting trolley descends, the lifting trolley tilts clockwise, and the oxygen gun tilts to the left; the verticality of the left track deviates to the left, and the right track deviates to the right. As the lifting trolley descends, the lifting trolley tilts clockwise, and the oxygen gun tilts to the left; the verticality of the left track deviates to the right, and the right track also deviates to the right. Left deflection, as the lifting trolley descends, the lifting trolley cannot move; the verticality of the left track deflects to the left, and the right track also deflects to the left. As the lifting trolley descends, the lifting trolley tilts counterclockwise, and the oxygen lance tilts to the right. After confirming the offset direction of the tracks on both sides and the offset direction of the oxygen lance, the upper and lower wheels on one side of the lifting trolley and the track on one side form the two sides of a right triangle, and the offset oxygen lance and the center line of the oxygen lance in the ideal state also form the two sides of a right triangle. The two triangles are similar triangles. Using the proportional principle of similar triangles, the offset size of the oxygen lance is calculated through the maximum gap between the lifting trolley and the track; finally, based on the data between the gap between the lifting trolley and the tracks on both sides and the offset size of the oxygen lance, the relationship between the gap between the lifting trolley and the tracks on both sides and the offset size of the oxygen lance is obtained.

2. A method for detecting the deviation of an oxygen lance according to claim 1, characterized in that: The steps include:

1. The track of the lifting trolley is divided into left and right sides. The offset and offset direction of the left and right tracks are detected. There will be four different offset situations, and the preset design gap between the wheels of the lifting trolley and the tracks on both sides is confirmed; 2. According to the different conditions of the tracks on both sides and the preset design gap, determine the maximum gap between the lifting trolley and the tracks on both sides under different conditions; 3. After confirming the maximum gap between the lifting trolley and the tracks on both sides, confirm the offset direction of the oxygen gun on the lifting trolley according to the offset direction of the tracks on both sides, and confirm the change of the offset direction of the oxygen gun as the lifting trolley rises and falls; 4. Using the proportional principle of similar triangles, calculate the offset size of the oxygen gun through the offset size and proportion of the lifting trolley; 5. After confirming the maximum gap between the rails on both sides and the lifting trolley and the offset size of the oxygen gun, the relationship between the maximum gap between the rails on both sides and the lifting trolley and the offset size of the oxygen gun is finally calculated through the relationship between the two values.

3. A method for detecting the deviation of an oxygen lance according to any one of claims 1 or 2, characterized in that: The preset design gap between the lifting trolley wheels and the rails on both sides is 8mm.

4. A method for installing an oxygen lance lifting track, characterized in that: First, the straightness tolerance of the two lifting rails is tested. After the test is qualified, the two lifting rails are divided into several sections, each of which is shorter than the wheelbase length of the upper and lower wheels of the lifting trolley. Then, the maximum gap between the wheels of the lifting trolley and the rails on both sides is tested within the range of each section according to the divided sections. The offset of the oxygen gun is confirmed by using a method for detecting the deviation of the oxygen gun as described in any one of claims 1 to 3. If it is within the offset range, the rail and the plant structure are fixed by spot welding. If it is not within the offset range, the rail is corrected and then fixed by spot welding.

5. The method for installing an oxygen lance lifting track according to claim 4, characterized in that: The lifting track is divided into a plurality of sections, and the number of sections is greater than 10.

6. The method for installing an oxygen lance lifting track according to claim 4, characterized in that: When spot welding the rails, the welding should be done symmetrically, and the rails should be knocked after each welding rod to eliminate internal stress.

7. The method for installing an oxygen lance lifting track according to claim 4, characterized in that: The correction operation uses triangular local heating correction, and the anti-deformation principle is used for correction during welding.

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