Method for three-dimensional detection of a state of a descaling nozzle

Abstract

This invention discloses a method for three-dimensional detection of the descaling nozzle status, specifically: S1: Two polytetrafluoroethylene (PTFE) plates are placed at intervals on the upper and lower surfaces of a test plate; S2: The mill roll gap is moved to its maximum position, and the descaling test plate is transported to the mill via a roller conveyor; S3: The inlet-side PTFE plate is aligned with the inlet nozzle position, the mill roll gap is moved to the descaling test position, and the fine descaling inlet is opened for descaling; S4: The mill roll gap is moved to its maximum position, the test plate is moved towards the mill exit direction, the outlet-side PTFE plate is aligned with the outlet nozzle position, the mill roll gap is moved to the descaling test position, and the fine descaling outlet is opened for descaling; S5: The descaling test plate is moved close to the roller conveyor and lowered onto a platform using an overhead crane; S6: Three-dimensional detection is performed on the descaling marks in the PTFE plates to detect the nozzle status. This method is simple and easy to implement, and, in addition to detecting the impact length and width, it detects the impact depth for more accurate judgment of the descaling nozzle status.

Description

Technical Field

[0001] This invention relates to a method for detecting the condition of a descaling nozzle, specifically a three-dimensional method for detecting the condition of a descaling nozzle, belonging to the field of metallurgical equipment technology. Background Technology

[0002] As the steel market deepens, customers have increasingly higher requirements for the surface finish of steel plates. Steel oxidizes at high temperatures, forming a dense layer of iron oxide scale (scaling) on ​​its surface. If this scale is not removed before rolling, it will be pressed into the strip surface by the rolls during the rolling process, affecting its surface quality. Residual iron oxide scale also accelerates roll wear and reduces roll life. If the strip requires pickling, residual iron oxide scale increases the difficulty of pickling and increases acid consumption. Therefore, before rolling the billet, the surface iron oxide scale must be removed using the mechanical impact of high-pressure water (high-pressure water descaling). The most common and effective method is high-pressure water pumping. High-pressure water enters the descaling nozzle, forming a powerful fan-shaped jet that strikes the surface of the steel billet (or intermediate billet). Under the action of this high-pressure jet, the iron oxide scale is cut, rapidly cooled and contracted, peeled from the base material, and washed away from the billet (or intermediate billet) surface, thus removing the scale completely. If the nozzle is not properly positioned (e.g., incorrect angle, blockage, wear, or damage), the descaling effect will be compromised, resulting in incomplete removal of iron oxide scale and ultimately affecting product surface quality. Therefore, it is crucial to ensure the nozzle is in good working order to avoid affecting the descaling effect and product quality.

[0003] Currently, the main method for detecting the condition of descaling nozzles is to apply water-based paint to a test plate, such as the method described in patent CN117066291A, which involves applying water-based paint to a specially made test plate and conducting an impact test to measure the impact marks on the surface of the test plate. This method can quickly and accurately determine whether the angle and usage condition of the descaling nozzle are up to standard. However, it can only confirm the length and width of the scratches through impact, but cannot detect the scratch depth, and cannot accurately determine the actual impact effect of the nozzle. Patent CN110238209B, a method for detecting the descaling effect of high-pressure water descaling equipment, mentions in its background technology that a lead plate is set on the test plate for descaling testing. The scratches produced by the lead plate are relatively shallow and cannot accurately reflect the nozzle condition, resulting in inaccurate detection.

[0004] Therefore, the urgent need to develop a three-dimensional detection method for the condition of descaling nozzles that can overcome the above defects has become a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] To address the aforementioned technical problems and overcome the shortcomings of existing technologies, this invention provides a method for three-dimensional detection of the descaling nozzle status. This method is simple and easy to implement. In addition to detecting the descaling impact length and width, it also detects the impact depth, enabling a more accurate assessment of the descaling nozzle status. This facilitates timely detection of descaling nozzle abnormalities, timely replacement and optimization, and improved surface quality of the steel plate.

[0006] To address the above technical problems, this invention provides a method for three-dimensional detection of the state of a descaling nozzle, specifically comprising the following steps:

[0007] S1: Prepare a test board, and place two polytetrafluoroethylene (PTFE) plates at intervals on the upper surface of the test board. Place two PTFE plates on the lower surface of the test board at positions corresponding to the PTFE plates on the upper surface. The edges of the PTFE plates shall not exceed the edges of the test board.

[0008] S2: Move the mill roll gap to the maximum position and manually convey the descaling test plate with PTFE plate attached to the mill through the roller conveyor.

[0009] S3: Align the PTFE plate on the inlet side of the test plate with the inlet nozzle position on the rolling mill, move the rolling mill roll gap to the descaling test position, and open the fine descaling inlet to perform descaling.

[0010] S4: Move the mill roll gap to the maximum position, open the test plate towards the mill exit, align the PTFE plate on the exit side with the exit nozzle position, move the mill roll gap to the descaling test position, and open the fine descaling outlet to perform descaling.

[0011] S5: Move the mill roll gap to its maximum position, open the descaling test plate close to the roll table, and lower it onto the platform using an overhead crane;

[0012] S6: Perform three-dimensional inspection of the descaling marks on the PTFE plate on the test board on the test bench, including the inspection of length, width and depth. The condition of the marks at the corresponding positions can indicate the nozzle condition, thus realizing the detection of nozzle condition.

[0013] The technical solution further defined in this invention is:

[0014] Furthermore, in the aforementioned method for three-dimensional detection of the descaling nozzle status, in step S1, the polytetrafluoroethylene plate is fixed to the upper and lower surfaces of the test plate by bolts.

[0015] In terms of technical benefits, this invention uses bolts to fix the polytetrafluoroethylene plate to the test plate, which facilitates installation and disassembly and is easy to use.

[0016] In the aforementioned method for three-dimensional detection of the descaling nozzle status, the width of the polytetrafluoroethylene plate is the same as the width of the test plate, such that one or both edges of the polytetrafluoroethylene plate are flush with the edge of the test plate.

[0017] In the aforementioned method for three-dimensional detection of the descaling nozzle status, the polytetrafluoroethylene plate has a length of 3300mm, a width of 500mm, and a thickness of 10mm.

[0018] In the aforementioned method for three-dimensional detection of the descaling nozzle status, the maximum position of the mill roll gap in steps S2 and S4 is 220mm.

[0019] In the aforementioned three-dimensional detection method for the descaling nozzle status, during fine descaling, the high-pressure water descaling pressure is 22 MPa, the descaling nozzle deflection angle is 15°, and the torsion angle is 15°.

[0020] The beneficial effects of this invention are:

[0021] Currently, water-based paint is used to detect impact marks to assess nozzle condition. However, the thinness of water-based paint film only allows for the detection of impact marks, confirming the length and width of the marks, but not the depth. This makes it impossible to accurately determine the actual impact effect of the nozzle. This invention uses PTFE plates on the upper and lower surfaces of the test plate. The plate structure is thick enough to effectively detect length, width, and depth. Furthermore, the plate structure uses PTFE plates instead of lead plates, as lead plates produce shallow marks that cannot accurately reflect the nozzle condition. This invention can detect depth, and the depth is clear. The precise detection allows for accurate assessment of the nozzle condition, facilitating timely detection of descaling nozzle abnormalities, timely replacement and optimization, and improved surface quality of the steel plate.

[0022] This invention features four test plates distributed on the upper and lower surfaces of the test plate, two on the top and two on the bottom, facilitating accurate measurement. One plate is sufficient if the nozzle angle is not properly adjusted during operation, while two plates provide greater precision.

[0023] The detection method of the present invention is convenient to use, low in cost, and reusable. It can effectively detect the operating status of the descaling nozzle in three dimensions, making it easy to detect nozzle failures in a timely manner and reduce steel plate quality problems caused by nozzle issues. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure detected in the three-dimensional detection method for the state of the descaling nozzle in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the test plate and the polytetrafluoroethylene plate combination in an embodiment of the present invention;

[0026] Figure 3 for Figure 2 Descaling marks on the surface of the test plate;

[0027] In the diagram: 1-Test plate, 2-PTFE plate. Detailed Implementation

[0028] To make the present invention clearer, the following description, in conjunction with the accompanying drawings, further illustrates a method for three-dimensional detection of the state of a descaling nozzle according to the present invention. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the present invention. Example 1

[0029] This embodiment provides a method for three-dimensional detection of descaling nozzle status, used in a medium-thickness plate and coil mill descaling test. The test method involves a descaling test plate being driven into the mill for the test, specifically including the following steps:

[0030] S1: Prepare a test plate 1 with a width of 500mm and a polytetrafluoroethylene (PTFE) plate 2. Cut four PTFE plates 2 into pieces with a length of 3300mm, a width of 500mm, and a thickness of 10mm. Fix them to the upper and lower surfaces of the descaling test steel plate with bolts. Figure 1 and 2 As shown, specifically:

[0031] Two polytetrafluoroethylene (PTFE) plates 2 are placed at intervals on the upper surface of the test steel plate, and two PTFE plates 2 are placed on the lower surface of the test steel plate at positions corresponding to the PTFE plates 2 on the upper surface.

[0032] S2: Use an overhead crane to lift the descaling test steel plate onto the roller table, set the mill roll gap to 220mm, and manually transport the descaling test plate 1 with the PTFE plate 2 attached to the mill through the roller table.

[0033] S3: Align the PTFE plate 2 on the inlet side of test plate 1 with the inlet nozzle position on the rolling mill (the nozzle is installed on the descaling manifold, which is welded to the front and back of the rolling mill). Move the rolling mill roll gap to the 60mm descaling test position, open the fine descaling inlet to perform descaling. During fine descaling, the high-pressure water descaling pressure is 22MPa, the descaling nozzle deflection angle is 15°, and the torsion angle is 15°. Descaling ends after 3 seconds.

[0034] S4: Move the mill roll gap to 220mm, open the test plate towards the mill exit, align the PTFE plate 2 on the exit side with the exit nozzle position, move the mill roll gap to 60mm, open the fine descaling outlet 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 descaling ends after 3 seconds.

[0035] S5: Set the mill roll gap to 220mm, open the descaling test plate close to the roll table, and lower it onto the platform using an overhead crane;

[0036] S6: Perform three-dimensional inspection of the descaling marks on the PTFE plate 2 of the test panel on the test bench. Use a ruler to measure the mark length, width, and depth, which are 112mm, 7mm, and 3mm respectively. Figure 3As shown in Figures A, B, and C, the impact length meets the process requirements, the impact depth is not significantly different from that of the newly installed nozzles, and the overall nozzle condition is good.

[0037] In addition to the embodiments described above, the present invention may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A method of detecting the condition of a three-dimensional descaling nozzle, characterized in that, Specifically, the following steps are included: S1: Prepare a test plate (1), and set two polytetrafluoroethylene plates (2) at intervals on the upper surface of the test plate (1). Set two polytetrafluoroethylene plates (2) on the lower surface of the test plate (1) at the position corresponding to the polytetrafluoroethylene plates (2) on the upper surface. The edge of the polytetrafluoroethylene plate (2) does not exceed the edge of the test plate (1). The polytetrafluoroethylene plate (2) is fixed to the upper and lower surfaces of the test plate (1) by bolts. The polytetrafluoroethylene plate (2) has a length of 3300mm, a width of 500mm, and a thickness of 10mm. S2: Move the mill roll gap to the maximum position of 220mm, and manually transport the descaling test plate with polytetrafluoroethylene plate (2) attached to it to the mill through the roller conveyor. S3: Align the PTFE plate (2) on the inlet side of the test plate (1) with the inlet nozzle position on the mill, move the mill roll gap to the 60mm descaling test position, and open the fine descaling inlet to perform 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 ends after 3 seconds. S4: Move the mill roll gap to the maximum position of 220mm, open the test plate towards the mill outlet, align the PTFE plate (2) on the outlet side with the outlet nozzle position, move the mill roll gap to the 60mm descaling test position, open the fine descaling outlet to perform 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 ends after 3 seconds; S5: Move the mill roll gap to the maximum position of 220mm, open the descaling test plate close to the roll table, and use an overhead crane to lower it onto the platform; S6: Perform three-dimensional inspection on the descaling marks in the polytetrafluoroethylene plate (2) on the test plate (1) on the test stand. Use a ruler to measure the length, width and depth of the marks. The condition of the marks at the corresponding positions can indicate the nozzle condition and realize the detection of the nozzle condition.

2. The method for three-dimensional detection of 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), such that one of the two side edges of the polytetrafluoroethylene plate (2) is flush with the edge of the test plate (1).

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