Calibration method for descaling machine inlet pinch roll and slab rolling method

Abstract

The invention discloses a calibration method for an inlet pinch roll of a descaling machine and a slab rolling method.The calibration method for the inlet pinch roll comprises the steps that firstly, the inlet pinch roll of the descaling machine is switched to a calibration mode, the descaling machine is switched to a manual roll gap mode, and after roll gap calibration and pressure testing are conducted, the manual roll gap mode is switched to a manual roll gap mode; and determining the state of the calibration block and the pressure value at the calibration block, determining the state of the calibration block and the pressure value at the calibration block, and when the calibration block is pressed by the inlet pinch roll and the pressure values at different calibration blocks are the same, controlling the roll gap of the inlet pinch roll to reach the second set value, and determining the pressure value at the calibration block. And the pressure output by the inlet pinch roll is removed, calibration of the inlet pinch roll is completed, through calibration operation of the inlet pinch roll, the shearing stability and the shearing precision of the flying shear are improved, the stability of plate blank rolling during fast-paced production is improved, and the waste pushing accident of the plate blank is effectively avoided.

Description

Technical Field

[0001] The present application relates to the technical field of steel rolling, and in particular to a calibration method for a pinch roller at an inlet of a descaling machine and a slab rolling method. Background Art

[0002] In the hot strip production line, the intermediate billet needs to enter the descaling box to clean the surface iron oxide before entering the finishing mill to prevent the iron oxide scale from pressing into the strip surface. As part of the descaling box, the descaling pinch rollers are used to press down the upper pinch rollers on the entrance to contact the strip surface after the head of the intermediate billet passes through, providing the strip with forward power, and at the same time seal the descaling water to prevent the descaling water from spraying on the strip surface and affecting the temperature detection of the intermediate billet; on the other hand, the pressure signal of the pinch rollers at the entrance of the descaling is also the automatic control condition for the switching of the head and tail modes of the flying shear and the interlocking control condition for the next intermediate billet to enter the finishing mill.

[0003] In the actual production process, uneven wear of the pinch rollers, reduced functional accuracy of the connecting parts of the pinch roller mechanism, failure of the hydraulic control valve, etc. will cause fluctuations in the pressure signal of the pinch rollers at the entrance of the fine dephosphorization and distortion of the thermal inspection before the flying shear, thereby causing shear failure of the flying shear. In addition, with the release of hot rolling capacity and the substantial improvement of the rolling rhythm, the existing calibration and control technology of the pinch rollers for fine descaling can easily cause accidents of slab scrapping, cannot adapt to the production rhythm, and reduce the stability of slab rolling during production. Summary of the invention

[0004] In view of the defects existing in the prior art, the present application provides a calibration method for the inlet pinch rollers of a descaling machine and a slab rolling method to solve the problem in the prior art that the calibration operation of the pinch rollers for fine descaling is complicated and causes the slab to be scrapped.

[0005] The above-mentioned purpose of the present application is mainly achieved through the following technical solutions:

[0006] On the one hand, the present application provides a calibration method for a pinch roller at an inlet of a descaling machine, the calibration method comprising:

[0007] The inlet pinch roller of the descaling machine is switched to the calibration mode, and the descaling machine is switched to the manual roller gap mode;

[0008] Controlling the size of the roller gap of the inlet pinch roller to a first set value, arranging at least two calibration blocks on the roller surface of the lower pinch roller, operating the upper pinch roller to move toward the lower pinch roller until the pressure applied to the upper pinch roller reaches a first pressure value, and completing the roller gap calibration;

[0009] After controlling the size of the roll gap of the inlet pinch roller to a second set value greater than the first set value, operating the upper pinch roller to move toward the lower pinch roller until the roll gap of the inlet pinch roller reaches the first set value, thereby completing the pressure test;

[0010] Confirming the state of the calibration block and the pressure value at the calibration block, and repeating the roll gap calibration and pressure test when the calibration block can be moved between the inlet pinch rollers and / or the pressure values ​​at different calibration blocks are different;

[0011] Confirm the status of the calibration block and the pressure value at the calibration block. When the entrance pinch roller presses the calibration block and the pressure values ​​at different calibration blocks are the same, control the roller gap of the entrance pinch roller to the second set value, cancel the pressure output to the entrance pinch roller, and complete the calibration of the entrance pinch roller.

[0012] In an optional embodiment, when the calibration blocks are arranged on the roller surface of the lower pinch roller, the calibration blocks are arranged at intervals at both ends of the roller surface of the lower pinch roller.

[0013] In an optional embodiment, the thickness of the calibration block is the same as the first set value.

[0014] In an optional embodiment, the first pressure value is not less than 40 KN, and the second set value is at least 15 mm greater than the first set value.

[0015] In an optional embodiment, the entrance pinch roller includes a frame, on which is provided a movably connected upper pinch roller and a fixedly connected lower pinch roller, and a hydraulic cylinder is provided between the frame and the upper pinch roller, and the hydraulic cylinder is used to drive the upper pinch roller to move closer to or away from the lower pinch roller.

[0016] In an optional embodiment, the upper pinch roller is provided with a base which can be detachably connected to the output end of the hydraulic cylinder, and when the hydraulic cylinder drives the upper pinch roller to move toward the lower pinch roller to the extreme position, the distance between the upper pinch roller and the lower pinch roller is not less than 4 mm.

[0017] On the other hand, based on the same inventive concept, the present application also provides a slab rolling method, which includes the calibration method as described above, and performs slab rolling after completing the calibration of the entrance pinch rollers.

[0018] In an optional embodiment, after completing the calibration of the entrance pinch roller, the steel biting signal and the pressure signal of the entrance pinch roller are obtained, and when the steel biting signal and the pressure signal meet the requirements, the flying shear tail preparation start sequence is started.

[0019] In an optional embodiment, when the entrance pinch roller pressure reaches or exceeds 45 KN, while the roller gap fluctuation deviation of the entrance pinch roller is kept less than 10 mm, the steel bite signal meets the requirement.

[0020] In an optional embodiment, when the rolling force of the rolling mill is greater than 15000 KN, the pressure signal meets the requirement.

[0021] Compared with the prior art, the advantages of this application are:

[0022] The calibration method of the inlet pinch roller of the descaling machine in the present application is as follows: first, the inlet pinch roller of the descaling machine is switched to the calibration mode, the descaling machine is switched to the manual roller gap mode, the size of the roller gap of the inlet pinch roller is controlled to a first set value, and at least two calibration blocks are arranged on the roller surface of the lower pinch roller, the upper pinch roller is operated to move toward the lower pinch roller until the pressure applied to the upper pinch roller reaches a first pressure value, and the roller gap calibration is completed, and then the size of the roller gap of the inlet pinch roller is controlled to a second set value larger than the first set value, and the upper pinch roller is operated to move toward the lower pinch roller until the roller gap of the inlet pinch roller reaches the first set value, and the pressure test is completed, and then the state of the calibration block and the calibration are confirmed. When the calibration block can be moved between the entrance pinch rollers, and / or the pressure values ​​at different calibration blocks are different, the roller gap calibration and pressure test are repeated, and the state of the calibration block and the pressure value at the calibration block are confirmed. When the entrance pinch roller presses the calibration block, and the pressure values ​​at different calibration blocks are the same, the roller gap of the entrance pinch roller is controlled to the second set value, and the pressure output to the entrance pinch roller is canceled to complete the calibration of the entrance pinch roller. By calibrating the entrance pinch roller, the stability and shearing accuracy of the flying shear are improved, the stability of the slab rolling during fast-paced production is improved, and the accident of slab scrapping is effectively avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A flow chart of a calibration method is provided for an embodiment of the present application;

[0025] Figure 2 A schematic diagram of the structure of the inlet pinch roller is provided for the embodiment of the present application;

[0026] In the figure: 101, frame; 102, upper pinch roller; 103, lower pinch roller; 201, hydraulic cylinder; 202, base. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. The specific structures and functional details disclosed herein are only used to describe the exemplary embodiments of the present invention. However, the present invention can be embodied in many alternative forms, and it should not be understood that the present invention is limited to the embodiments set forth herein.

[0028] Descaling machine, especially in the metallurgical industry, mainly refers to the equipment used to remove the oxide scale (also called scale or iron scale) on the surface of steel strip or steel plate. This process is crucial to improve the surface quality and subsequent processing performance of steel, ensuring better corrosion resistance, paintability and appearance.

[0029] like Figure 1 As shown, Figure 1 A flow chart of a calibration method is provided for an embodiment of the present application. On the one hand, the present application provides a calibration method for an inlet pinch roller of a descaling machine, and the calibration method comprises:

[0030] The inlet pinch roller of the descaling machine is switched to the calibration mode, and the descaling machine is switched to the manual roller gap mode;

[0031] Control the size of the roller gap of the inlet pinch roller to a first set value, arrange at least two calibration blocks on the roller surface of the lower pinch roller 103, operate the upper pinch roller 102 to move toward the lower pinch roller 103, until the pressure applied to the upper pinch roller 102 reaches a first pressure value, and complete the roller gap calibration;

[0032] After controlling the size of the roll gap of the inlet pinch roller to a second set value greater than the first set value, operating the upper pinch roller 102 to move toward the lower pinch roller 103 until the roll gap of the inlet pinch roller reaches the first set value, thereby completing the pressure test;

[0033] Confirming the state of the calibration block and the pressure value at the calibration block, and repeating the roll gap calibration and pressure test when the calibration block can be moved between the inlet pinch rollers and / or the pressure values ​​at different calibration blocks are different;

[0034] Confirm the status of the calibration block and the pressure value at the calibration block. When the entrance pinch roller presses the calibration block and the pressure values ​​at different calibration blocks are the same, control the roller gap of the entrance pinch roller to the second set value, cancel the pressure output to the entrance pinch roller, and complete the calibration of the entrance pinch roller.

[0035] After completing the roller gap calibration and pressure test, when confirming the state of the calibration block and the pressure value at the calibration block, the calibration block can be moved between the entrance pinch rollers, and the pressure values ​​at different calibration blocks are different. In any of the above situations, it is necessary to perform roller gap calibration and pressure test again until the calibration block cannot move between the entrance pinch rollers and the pressure values ​​at different calibration blocks remain consistent.

[0036] In an optional embodiment, the calibration method of the inlet pinch roller of the descaling machine in the present application first switches the inlet pinch roller of the descaling machine to the calibration mode, switches the descaling machine to the manual roller gap mode, controls the size of the roller gap of the inlet pinch roller to a first set value, and arranges at least two calibration blocks on the roller surface of the lower pinch roller 103, operates the upper pinch roller 102 to move toward the lower pinch roller 103 until the pressure applied to the upper pinch roller 102 reaches a first pressure value, and the roller gap calibration is completed, and then the size of the roller gap of the inlet pinch roller is controlled to a second set value larger than the first set value, and then the upper pinch roller 102 is operated to move toward the lower pinch roller 103 until the roller gap of the inlet pinch roller reaches the first set value, and the pressure test is completed, and then confirmed. The state of the calibration block and the pressure value at the calibration block. When the calibration block can be moved between the entrance pinch rollers, and / or the pressure values ​​at different calibration blocks are different, repeat the roller gap calibration and pressure test, and confirm the state of the calibration block and the pressure value at the calibration block. When the entrance pinch roller presses the calibration block, and the pressure values ​​at different calibration blocks are the same, control the roller gap of the entrance pinch roller to the second set value, cancel the pressure output to the entrance pinch roller, and complete the calibration of the entrance pinch roller. Through the calibration operation of the entrance pinch roller, the stability and shearing accuracy of the flying shear are improved, the stability of slab rolling during fast-paced production is improved, and the accident of slab scrapping is effectively avoided.

[0037] In an optional embodiment, when the calibration blocks are arranged on the roller surface of the lower pinch roller 103, the calibration blocks are arranged at intervals at both ends of the roller surface of the lower pinch roller 103 to keep the calibration blocks between the upper pinch roller 102 and the lower pinch roller 103 at as relatively far a distance as possible, so as to calibrate the roller gap between the upper pinch roller 102 and the lower pinch roller 103.

[0038] In an optional embodiment, the thickness of the calibration block is the same as the first set value, and the calibration block is disposed between the upper pinch roller 102 and the lower pinch roller 103. It should be noted that the calibration block is arranged between the roller surfaces of the upper pinch roller 102 and the lower pinch roller 103. When the thickness of the calibration block is set to be the same as the first set value, after the calibration block is clamped by the upper pinch roller 102 and the lower pinch roller 103, the roller gap between the upper pinch roller 102 and the lower pinch roller 103 is the thickness of the calibration block. The known thickness of the calibration block can be used to perform numerical calibration of the roller gap size, which is more efficient and more reliable.

[0039] In an optional embodiment, the first pressure value is not less than 40 KN, and the second set value is at least 15 mm larger than the first set value, so as to maintain a reliable operating space during the pressure test operation.

[0040] like Figure 2 As shown, Figure 2 A structural schematic diagram of the entrance pinch roller is provided for an embodiment of the present application. In an optional embodiment, the entrance pinch roller includes a frame 101, on which is provided an upper pinch roller 102 that is movably connected and a lower pinch roller 103 that is fixedly connected. A hydraulic cylinder 201 is provided between the frame 101 and the upper pinch roller 102, and the hydraulic cylinder 201 is used to drive the upper pinch roller 102 to move closer to or away from the lower pinch roller 103.

[0041] In an optional embodiment, the upper pinch roller 102 is provided with a base 202 which can be detachably connected to the output end of the hydraulic cylinder 201, and when the hydraulic cylinder 201 drives the upper pinch roller 102 to move toward the lower pinch roller 103 to the extreme position, the distance between the upper pinch roller 102 and the lower pinch roller 103 is not less than 4 mm, so that there is a safe distance between the upper pinch roller 102 and the lower pinch roller 103 to maintain stability in the calibration method.

[0042] On the other hand, based on the same inventive concept, the present application also provides a slab rolling method, which includes the calibration method as mentioned above, and after completing the calibration of the entrance pinch rollers, the slab rolling is carried out, with the calibration of the entrance pinch rollers as an operating prerequisite to maintain stable rolling operations.

[0043] In an optional embodiment, after completing the calibration of the entrance pinch rollers, the steel biting signal and the pressure signal of the entrance pinch rollers are obtained, and when the steel biting signal and the pressure signal meet the requirements, the flying shear tail cutting preparation start sequence is started. When the flying shear tail cutting preparation start sequence is started, it is effectively prevented from starting the tail cutting preparation sequence before the slab bites the steel, thereby effectively avoiding the flying shear from accidentally cutting the large tail and causing the steel to get stuck.

[0044] In an optional embodiment, when the entrance pinch roller pressure reaches or exceeds 45 KN, while the roller gap fluctuation deviation of the entrance pinch roller is kept less than 10 mm, the steel bite signal meets the requirement.

[0045] In an optional embodiment, when the rolling force of the rolling mill is greater than 15000 KN, the pressure signal meets the requirement.

[0046] It should be understood that the terms first, second, etc. are only used to distinguish descriptions and should not be understood as indicating or suggesting relative importance. Although the terms first, second, etc. may be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another unit. For example, the first unit may be referred to as the second unit, and similarly, the second unit may be referred to as the first unit without departing from the scope of the exemplary embodiments of the present invention.

[0047] It should be understood that the term "and / or" in this article is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" in this article describes another relationship between associated objects, indicating that two relationships may exist. For example, A / and B can represent two situations: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0048] It should be understood that in the description of the present invention, the terms "upper", "vertical", "inside", "outside" and the like indicate orientations or positional relationships that are customarily placed when the disclosed product is used, or are orientations or positional relationships that are customarily understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0049] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] The terms used herein are only used to describe specific embodiments and are not intended to limit the exemplary embodiments of the present invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates the opposite meaning. It should also be understood that the terms "include", "comprising", "including", and / or "comprising" when used herein specify the existence of the claimed features, integers, steps, operations, units, and / or components, and do not exclude the existence or increase of one or more other features, quantities, steps, operations, units, components, and / or their combinations.

[0051] Specific details are provided in the following description to facilitate a complete understanding of the exemplary embodiments. However, it should be understood by those of ordinary skill in the art that the exemplary embodiments may be implemented without these specific details. In other embodiments, well-known processes, structures, and techniques may not be shown in unnecessary detail to avoid making the exemplary embodiments unclear.

[0052] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

[0053] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field.

Claims

1. A method for calibrating the pinch roller at the inlet of a descaling machine, characterized in that: The calibration method comprises: The inlet pinch roller of the descaling machine is switched to the calibration mode, and the descaling machine is switched to the manual roller gap mode; Controlling the size of the roller gap of the inlet pinch roller to a first set value, arranging at least two calibration blocks on the roller surface of the lower pinch roller, operating the upper pinch roller to move toward the lower pinch roller until the pressure applied to the upper pinch roller reaches a first pressure value, and completing the roller gap calibration; After controlling the size of the roll gap of the inlet pinch roller to a second set value greater than the first set value, operating the upper pinch roller to move toward the lower pinch roller until the roll gap of the inlet pinch roller reaches the first set value, thereby completing the pressure test; Confirming the state of the calibration block and the pressure value at the calibration block, and repeating the roll gap calibration and pressure test when the calibration block can be moved between the inlet pinch rollers and / or the pressure values ​​at different calibration blocks are different; Confirm the status of the calibration block and the pressure value at the calibration block. When the entrance pinch roller presses the calibration block and the pressure values ​​at different calibration blocks are the same, control the roller gap of the entrance pinch roller to the second set value, cancel the pressure output to the entrance pinch roller, and complete the calibration of the entrance pinch roller.

2. The method for calibrating the pinch roller at the inlet of the descaling machine according to claim 1, characterized in that: When the calibration blocks are arranged on the roller surface of the lower pinch roller, the calibration blocks are arranged at intervals at both ends of the roller surface of the lower pinch roller.

3. The calibration method for the pinch roller of the descaling machine entrance as claimed in claim 1, characterized in that: The thickness of the calibration block is the same as the first set value.

4. The method for calibrating the pinch roller at the inlet of the descaling machine as claimed in claim 3, characterized in that: The first pressure value is not less than 40KN, and the second set value is at least 15mm greater than the first set value.

5. The calibration method for the pinch roller at the inlet of the descaling machine as claimed in claim 1, characterized in that: The inlet pinch roller comprises a frame, on which a movably connected upper pinch roller and a fixedly connected lower pinch roller are arranged, and a hydraulic cylinder is arranged between the frame and the upper pinch roller, and the hydraulic cylinder is used to drive the upper pinch roller to move closer to or away from the lower pinch roller.

6. The method for calibrating the pinch roller at the inlet of the descaling machine as claimed in claim 5, characterized in that: The upper pinch roller is provided with a base which can be detachably connected to the output end of the hydraulic cylinder, and when the hydraulic cylinder drives the upper pinch roller to move toward the lower pinch roller to the extreme position, the distance between the upper pinch roller and the lower pinch roller is not less than 4 mm.

7. A slab rolling method, characterized in that: The slab rolling method comprises the calibration method as claimed in any one of claims 1 to 6, and after completing the calibration of the entrance pinch rolls, the slab rolling is performed.

8. The slab rolling method according to claim 7, characterized in that: After completing the calibration of the entrance pinch roller, the steel biting signal and the pressure signal of the entrance pinch roller are obtained, and when the steel biting signal and the pressure signal meet the requirements, the flying shear tail preparation start sequence is started.

9. The slab rolling method according to claim 8, characterized in that: When the entrance pinch roller pressure reaches or exceeds 45KN and the roller gap fluctuation deviation of the entrance pinch roller is kept less than 10mm, the steel bite signal meets the requirement.

10. The slab rolling method according to claim 8, characterized in that: When the rolling force of the rolling mill is greater than 15000 KN, the pressure signal meets the requirement.

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