Method for three-dimensionally detecting state of descaling nozzle

Abstract

The invention discloses a method for three-dimensionally detecting the state of a descaling nozzle. The method specifically comprises the following steps: S1, arranging two polyfluortetraethylene plates on each of the upper and lower surfaces of a test plate at intervals; s2, the roll gap of the rolling mill is swung to the maximum position, and the descaling test plate is conveyed to the rolling mill through a roller path; s3, an inlet side polyfluortetraethylene plate corresponds to an inlet nozzle in position, a rolling mill roll gap is swung to a descaling test position, and a fine descaling inlet is opened for descaling; s4, the roll gap of the rolling mill is swung to the maximum position, the test plate is opened towards the outlet of the rolling mill, the outlet side polyfluortetraethylene plate corresponds to the position of an outlet nozzle, the roll gap of the rolling mill is swung to the descaling test position, and a fine descaling outlet is opened for descaling; s5, the descaling test plate is driven to be close to a roller way, and a crown block is used for hoisting and lowering the descaling test plate onto a rack; s6, performing three-dimensional detection on the descaling nicks in the polyfluortetraethylene plate to realize detection of the state of the nozzle; the method is simple and easy to implement, the striking depth is detected on the basis of detecting the striking length and width, and the state of the descaling nozzle is judged more accurately.

Description

Technical Field

[0001] The invention relates to a method for detecting the state of a descaling nozzle, in particular to a method for three-dimensionally detecting the state of a descaling nozzle, and belongs to the technical field of metallurgical equipment. Background Art

[0002] With the further development of the steel market, customers have higher and higher requirements for the surface of steel plates. Steel is oxidized at high temperatures, forming a dense layer of iron oxide scale (scale) on its surface. If this layer of iron oxide scale cannot be removed before rolling, it will be pressed into the surface of the strip by the roller during the rolling process, affecting its surface quality. The residual iron oxide scale will also accelerate the wear of the roller and reduce the service life of the roller. If the strip needs to be pickled, the residual iron oxide scale will increase the difficulty of pickling and increase acid consumption. Therefore, before rolling the billet, the surface iron oxide scale must be removed. The mechanical impact force of high-pressure water is used to remove the iron oxide scale (high-pressure water descaling). The most common and effective method is to use a high-pressure water pump to generate high-pressure water to enter the descaling nozzle. Under the action of the nozzle, the high-pressure water forms a fan-shaped water jet with great impact force, which is sprayed onto the surface of the billet (or intermediate billet). Under the action of this high-pressure fan-shaped water jet, the oxidized iron scale undergoes a process of being cut, rapidly cooled and shrunk, peeled off from the base material, and washed away from the surface of the billet (or intermediate billet), thereby removing the oxidized iron scale. When the state of the nozzle does not meet the requirements, such as incorrect angle, blockage, wear, and damage, it will affect the descaling impact effect of high-pressure water, resulting in the inability to completely remove the oxidized iron scale on the surface of the steel plate, which will ultimately affect the surface quality of the product. Therefore, it is necessary to ensure the state of the nozzle to avoid affecting the descaling impact effect and product quality.

[0003] At present, the main method for detecting the state of the descaling nozzle is to brush water-based paint on the test board. For example, patent CN117066291A is a method for quickly and accurately checking the state of the descaling nozzle. By coating a special test sample with water-based paint, a blow test is carried out, and the blow mark on the surface of the test sample is measured. It can quickly and accurately determine whether the angle and use status of the descaling nozzle are qualified. However, it can only confirm the length and width of the mark by striking, and cannot detect the depth of the mark, and cannot accurately determine the actual striking effect of the nozzle; patent CN110238209B is a method for detecting the descaling effect of high-pressure water descaling equipment. Its background technology mentions that a lead plate is set on the test board for descaling test. The mark made by the lead plate is relatively shallow and cannot accurately reflect the nozzle state, resulting in the accuracy of the detection part.

[0004] Therefore, it is urgent to develop a method for three-dimensionally detecting the state of a descaling nozzle that can overcome the above defects, which has become a technical problem that needs to be solved urgently by technical personnel in this field. Summary of the invention

[0005] In view of the above-mentioned technical problems, the present invention overcomes the shortcomings of the prior art and provides a method for three-dimensionally detecting the state of a descaling nozzle. The method is simple and easy to implement. The striking depth is detected on the basis of detecting the descaling striking length and width, and the state of the descaling nozzle is judged more accurately, which is convenient for timely detection of descaling nozzle abnormalities, timely replacement and optimization, and improvement of the physical surface quality of the steel plate.

[0006] In order to solve the above technical problems, the present invention provides a method for three-dimensionally detecting the state of a descaling nozzle, which specifically comprises the following steps: S1: prepare a test plate, set two polytetrafluoroethylene plates on the upper surface of the test plate, and set two polytetrafluoroethylene plates on the lower surface of the test plate at positions corresponding to the polytetrafluoroethylene plates on the upper surface, and the edges of the polytetrafluoroethylene plates do not exceed the edges of the test plate; S2: The roll gap of the rolling mill is swung to the maximum position, and the descaling test plate with the polytetrafluoroethylene plate attached is manually transported to the rolling mill through the roller conveyor; S3: The polytetrafluoroethylene plate at the inlet side of the test plate is aligned with the inlet nozzle position of the rolling mill, the roll gap of the rolling mill is swung to the descaling test position, and the fine descaling inlet is opened for descaling; S4: The roll gap of the rolling mill is swung to the maximum position, the test plate is opened toward the rolling mill outlet, the polytetrafluoroethylene plate on the outlet side is aligned with the outlet nozzle position, the roll gap of the rolling mill is swung to the descaling test position, and the fine descaling outlet is opened for descaling; S5: Move the mill roll gap to the maximum position, move the descaling test plate close to the roller table, and lower it onto the stand using a crane; S6: Perform three-dimensional detection of the descaling marks in the polytetrafluoroethylene plate on the test plate on the bench, including detection of length, width and depth. The situation of the marks at the corresponding positions can explain the nozzle status, thereby realizing the detection of the nozzle status.

[0007] The technical solution further defined in the present invention is: Furthermore, in the aforementioned method for three-dimensionally detecting the state of a descaling nozzle, in step S1, the polytetrafluoroethylene plate is fixed to the upper and lower surfaces of the test plate by bolts.

[0008] Technical effect: the present invention uses bolts to fix the polytetrafluoroethylene plate on the test plate, which is convenient for installation and disassembly and easy to use.

[0009] In the above method for three-dimensionally detecting the state of a descaling nozzle, the width of the polytetrafluoroethylene plate is the same as the width of the test plate so that two side edges of the polytetrafluoroethylene plate are flush with the edges of the test plate.

[0010] In the above-mentioned method for three-dimensionally detecting the state of the descaling nozzle, the length of the polytetrafluoroethylene plate is 3300 mm, the width is 500 mm, and the thickness is 10 mm.

[0011] In the above-mentioned method for three-dimensionally detecting the state of the descaling nozzle, in step S2 and step S4, the rolling mill roll gap is swung to the maximum position of 220 mm.

[0012] In the aforementioned method for three-dimensionally detecting the state of the descaling nozzle, during fine descaling, the high-pressure water descaling pressure is 22 MPa, the descaling nozzle has a deflection angle of 15° and a torsion angle of 15°.

[0013] The beneficial effects of the present invention are: At present, water-based paint is used to detect the striking mark to detect the state of the nozzle. However, the thickness of the water-based paint film is low, so it can only detect the length and width of the striking mark, but cannot detect the depth of the mark, and cannot accurately judge the actual striking effect of the nozzle. The present invention arranges polytetrafluoroethylene plates on the upper and lower surfaces of the test plate. The thickness of the plate structure is sufficient to effectively detect the length, width and depth, and the plate structure adopts polytetrafluoroethylene plates instead of lead plates. The marks made by the lead plates are relatively shallow and cannot accurately reflect the state of the nozzle. The present invention can not only detect the depth, but also the depth is obvious. The precise detection and grasp of the state of the nozzle is convenient for timely discovery of descaling nozzle abnormalities, timely replacement and optimization, and improving the physical surface quality of the steel plate.

[0014] The present invention distributes a total of four test plates on the upper and lower surfaces of the test plate, two on the upper and lower surfaces, which is convenient for accurate measurement. If one plate is used, the nozzle has an error angle when working and is not adjusted well, and two plates can be more accurate.

[0015] The detection method of the present invention is easy to use, low in cost, and reusable, and can effectively detect the operating status of the descaling nozzle in three dimensions, so as to facilitate timely discovery of nozzle failures and reduce steel plate quality problems caused by nozzle problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the detection in the method for three-dimensionally detecting the state of a descaling nozzle in an embodiment of the present invention; Figure 2 It is a schematic structural diagram of the combination of a test plate and a polytetrafluoroethylene plate in an embodiment of the present invention; Figure 3 for Figure 2 Descaling marks on the surface of the test plate; In the figure: 1 - test plate, 2 - polytetrafluoroethylene plate. DETAILED DESCRIPTION

[0017] To make the present invention more clear, a three-dimensional method for detecting the state of a descaling nozzle of the present invention is further described below in conjunction with the accompanying drawings. The specific embodiments described here are only used to explain the present invention and are not used to limit the present invention. Example 1

[0018] This embodiment provides a method for three-dimensionally detecting the state of a descaling nozzle, which is used for descaling test of a rolling mill in a medium and thick plate coil plant; the test method is as follows: the descaling test plate is driven into the rolling mill for descaling test, which specifically includes the following steps: S1: Prepare a test plate 1 with a width of 500 mm and a polytetrafluoroethylene plate 2. Cut the polytetrafluoroethylene plate 2 into four pieces with a length of 3300 mm, a width of 500 mm, and a thickness of 10 mm. Fix them on the upper and lower surfaces of the descaling test steel plate with bolts. Figure 1 and 2 As shown, specifically: Two polytetrafluoroethylene plates 2 are arranged at intervals on the upper surface of the test steel plate, and two polytetrafluoroethylene plates 2 are arranged on the lower surface of the test steel plate at positions corresponding to the polytetrafluoroethylene plates 2 on the upper surface; S2: The descaling test steel plate is hoisted onto the roller table by an overhead crane, the roll gap of the rolling mill is swung to 220 mm, and the descaling test plate 1 attached with the polytetrafluoroethylene plate 2 is manually transported to the rolling mill through the roller table; S3: The polytetrafluoroethylene plate 2 at the inlet side of the test plate 1 is aligned with the inlet nozzle position on the rolling mill (the nozzle is installed on the descaling manifold, and the descaling manifold is welded before and after the rolling mill), the mill roll gap is swung to the 60mm descaling test position, and the fine descaling inlet is opened for descaling. During fine descaling, the high-pressure water descaling pressure is 22MPa, the descaling nozzle has a deflection angle of 15°, a torsion angle of 15°, and the descaling is completed after 3s; S4: The mill roll gap is swung to 220mm, the test plate is opened toward the mill outlet, the outlet side polytetrafluoroethylene plate 2 is aligned with the outlet nozzle position, the mill roll gap is swung to 60mm, the fine descaling outlet is opened for descaling, during fine descaling, the high-pressure water descaling pressure is 22MPa, the descaling nozzle deflection angle is 15°, the torsion angle is 15°, and the descaling is completed after 3S; S5: Swing the mill roll gap to 220mm, move the descaling test plate close to the roller table, and lower it onto the stand with a crane; S6: Perform three-dimensional inspection on the descaling marks in the polytetrafluoroethylene plate 2 on the test plate on the bench, and use a ruler to measure the length, width, and depth of the marks, which are 112 mm, 7 mm, and 3 mm respectively. Figure 3 As shown in Figures A, B, and C, the striking length meets the process requirements, the striking depth has no obvious difference from the new nozzle, and the overall nozzle condition is good.

[0019] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. A method for three-dimensionally detecting the state of a descaling nozzle, characterized in that: The specific steps include: S1: preparing a test plate (1), arranging two polytetrafluoroethylene plates (2) on the upper surface of the test plate (1) at intervals, and arranging two polytetrafluoroethylene plates (2) on the lower surface of the test plate (1) at positions corresponding to the polytetrafluoroethylene plates (2) on the upper surface, wherein the edges of the polytetrafluoroethylene plates (2) do not exceed the edges of the test plate (1); S2: The roll gap of the rolling mill is adjusted to the maximum position, and the descaling test plate attached with the polytetrafluoroethylene plate (2) is manually conveyed to the rolling mill through the roller conveyor; S3: The polytetrafluoroethylene plate (2) at the inlet side of the test plate (1) is aligned with the inlet nozzle position of the rolling mill, the roll gap of the rolling mill is moved to the descaling test position, and the fine descaling inlet is opened to perform descaling; S4: the roll gap of the rolling mill is swung to the maximum position, the test plate is opened toward the rolling mill outlet, the polytetrafluoroethylene plate (2) on the outlet side is aligned with the outlet nozzle position, the roll gap of the rolling mill is swung to the descaling test position, and the fine descaling outlet is opened for descaling; S5: Move the mill roll gap to the maximum position, move the descaling test plate close to the roller table, and lower it onto the stand using a crane; S6: Performing a three-dimensional inspection on the descaling marks in the polytetrafluoroethylene plate (2) on the test plate (1) on the bench, including inspection of the length, width and depth. The situation of the marks at the corresponding positions can indicate the nozzle status, thereby realizing the inspection of the nozzle status.

2. The method for three-dimensionally detecting the state of a descaling nozzle according to claim 1, characterized in that: In step S1, the polytetrafluoroethylene plate (2) is fixed to the upper and lower surfaces of the test plate (1) by means of bolts.

3. The method for three-dimensionally detecting the state of a descaling nozzle according to claim 1, characterized in that: The width of the polytetrafluoroethylene plate (2) is the same as the width of the test plate (1), so that two side edges of the polytetrafluoroethylene plate (2) are flush with the edges of the test plate (1).

4. The method for three-dimensionally detecting the state of a descaling nozzle according to claim 1, characterized in that: The polytetrafluoroethylene plate (2) has a length of 3300 mm, a width of 500 mm and a thickness of 10 mm.

5. The method for three-dimensionally detecting the state of a descaling nozzle according to claim 1, characterized in that: In step S2 and step S4, the roll gap of the rolling mill is swung to a maximum position of 220 mm.

6. The method for three-dimensionally detecting the state of a descaling nozzle according to claim 1, characterized in that: During the fine descaling, the high-pressure water descaling pressure is 22 MPa, the descaling nozzle has a deflection angle of 15° and a torsion angle of 15°.

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