Plate shape measuring method for flat outlet strip steel

Abstract

The invention discloses a strip shape measuring method for flattening outlet strip steel, which belongs to the technical field of steel rolling and comprises a flattening line consisting of an uncoiling area, a flattening machine, a strip shape measuring area and a coiling area which are sequentially arranged along the conveying direction of the strip steel. The measuring method comprises the following steps: stopping a leveling line, and cutting off uncoiling tension and coiling tension; the coiling tension is reduced to a set value; releasing the residual stress of the strip steel in the strip shape measuring area; and measuring plate shape data of the plate shape measuring area. According to the method, real measurement of the natural plate shape of the flat outlet strip steel can be realized on the premise of not dividing coils, not hoisting and not damaging the integrity of the steel coils. According to the method, the problem that the strip shape defect is covered by production tension is effectively avoided, meanwhile, serious interference of strip steel self-weight sagging in the zero-tension state on a measurement result is also avoided, a reliable data basis is provided for leveling parameter adjustment, and the accuracy and stability of leveling strip shape control are remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of steel rolling technology, specifically a method for measuring the shape of flattened export strip steel. Background Technology

[0002] Due to their high yield strength, low plasticity reserve, and sensitivity to residual stress, hot-rolled thin-gauge high-strength steel sheets are highly susceptible to waviness defects during hot rolling, coiling, and cooling. To correct these defects, steel mills typically implement a leveling process after hot rolling to restore the strip shape. Current leveling processes primarily utilize single-stand leveling machines. Operators adjust leveling parameters such as rolling force, bending roll force, and work roll tilt based on the strip shape at the leveling inlet, using their experience to improve uneven strip elongation. Some leveling production lines also include an exit straightener at the leveling machine exit to release residual internal stress in the leveled strip, further improving shape stability.

[0003] However, in actual production, the methods for measuring the shape of the flattened outlet plate are severely inadequate, mainly in the following aspects:

[0004] First, existing leveling production lines generally lack online strip shape measurement devices. Under normal production conditions, the strip at the leveling exit is under significant coiling tension, forcibly straightening the strip and masking shape defects. This fails to accurately reflect the natural shape after leveling, making it difficult for operators to promptly assess the effectiveness of leveling parameter adjustments. Strip shape control relies heavily on experience, resulting in considerable uncertainty.

[0005] Secondly, if the coiling tension is reduced to near zero by stopping the machine to observe the strip shape, the strip will sag significantly in the exit area due to its own weight, especially for thin strips. The sag deformation will seriously interfere with the shape judgment, distort the measurement results, and in severe cases, may also cause quality defects such as coiling misalignment and scratches, affecting the overall quality of the steel coil and the production rhythm.

[0006] Furthermore, the current method used in some production lines, which involves cutting a certain length of strip steel and hoisting it to a platform for shape measurement, requires the steel coil to be split into smaller coils. This not only increases the complexity of the process and the labor intensity, but also means that this method can only perform offline inspection of the head or tail of the steel coil. It cannot achieve continuous measurement of the shape of the steel coil at any position during the flattening process, making it difficult to reflect the consistency of the shape of the entire strip steel coil. Summary of the Invention

[0007] The purpose of this invention is to provide a method for measuring the shape of flattened export strip steel, so as to solve the problems mentioned in the prior art.

[0008] A method for measuring the shape of flattened export strip steel is provided, including: A leveling line consisting of an uncoiling zone, a leveling machine, a strip shape measurement zone, and a coiling zone arranged sequentially along the strip conveying direction; The measurement method includes the following steps: S1. The leveling line is stopped, and the unwinding tension and winding tension are cut off. S2. Reduce the winding tension to the set value; S3. Release the residual stress in the strip steel in the plate shape measurement area; S4. Measure the plate shape data of the plate shape measurement area.

[0009] As a further embodiment of the present invention: a leveling exit straightening machine is provided between the leveling machine and the plate shape measurement area; In step S1, after cutting off the uncoiling tension and the coiling tension, the flattening exit straightener releases the tension of the strip.

[0010] During normal production, the leveling and straightening machine applies continuous bending and reverse bending to the strip. The roller system not only alters the distribution of residual stress within the strip but also imposes additional constraints on the coiling tension. When entering the shape measurement mode, the upper roller system of the straightening machine is raised, causing the straightening machine to switch from an operating state to a non-operating state. This eliminates the mechanical contact and additional load of the straightening machine on the strip, allowing the tension between the coiling area and the leveling machine to be fully released.

[0011] This setting can prevent the straightener from having a secondary impact on the strip shape under low tension measurement conditions, so that the coiling tension setting can truly reflect the stress state of the strip in the measurement area, thereby improving the accuracy and consistency of the strip shape measurement results.

[0012] As a further aspect of the present invention: In step S1, after the leveling line stops, the leveling machine maintains the rolling force on the strip steel, thereby cutting off the uncoiling tension and the coiling tension.

[0013] When the machine is stopped, if the rolling force of the leveler is released simultaneously, the strip will be in a free state, which can easily lead to uncontrollable sagging or positional displacement. By keeping the gap between the leveler's work rolls constant, the strip remains stably clamped between the work rolls. The leveler acts as a tension isolation node, making the tension adjustments on the uncoiling and coiling sides independent of each other. Adjustments to the coiling tension will not be transmitted to the uncoiling side. This measure ensures the controllability of the strip's stress state within the shape measurement area, preventing measurement instability caused by overall relaxation. It also avoids interference from tension fluctuations on the uncoiling side on the shape of the strip in the measurement area, creating stable boundary conditions for subsequent low-tension measurements.

[0014] As a further aspect of the present invention: in step S2, the tension is set to 10kN-30kN.

[0015] The explicit shaping of strip depends on the balance between tension and the strip's bending stiffness. When the coiling tension is too high, waviness defects in the strip will be flattened by the tension. When the coiling tension is too low, the deflection of the strip due to its own weight will dominate in the measurement zone. By limiting the coiling tension to the range of 10kN–30kN, the strip in the measurement zone is placed in a state between excessive relaxation and tightness.

[0016] As a further aspect of the present invention: when the thickness of the strip steel plate is ≤3mm, the winding tension is 10kN-17kN; when the thickness of the strip steel plate is >3mm and ≤4mm, the winding tension is 17kN-23kN; when the thickness of the strip steel plate is >4mm, the winding tension is 23kN-30kN.

[0017] Under the same tension, strip steel of different thicknesses exhibits significant differences in sag and waviness response. Thinner strip steel has lower bending stiffness and can maintain a stable posture under relatively low tension; while thicker strip steel has higher self-weight and bending stiffness, requiring greater tension to avoid significant sag. By setting the coiling tension in segments, strip steel of different thicknesses is kept in a similar mechanical state during measurement. This scheme significantly improves the adaptability of the strip shape measurement method to strip steel of different specifications, avoids systematic measurement deviations caused by specification variations, and ensures that the measurement results are comparable laterally and consistent longitudinally.

[0018] As a further aspect of the present invention: the two ends of the plate shape measuring area are provided with rotating rollers that contact the steel strip.

[0019] The rotating rollers create a stress state similar to a simply supported beam along the length of the strip in the measurement zone, limiting the free sag length of the strip within the measurement zone and preventing the sag deformation from expanding infinitely into the measurement zone. This structure effectively reduces the impact of overall sag on the strip shape measurement, ensuring that the waviness within the measurement zone is primarily determined by the strip shape defects themselves, thus improving the stability and reliability of the measurement data.

[0020] As a further aspect of the present invention: in step S3, the residual stress of the strip in the strip shape measurement area is released by applying a load to the top surface of the strip at least once.

[0021] After leveling, the residual stress inside the strip may form a temporarily stable waviness mode that does not change immediately even when the tension is reduced. By applying an external load, the strip undergoes a local elastoplastic response, and the internal stress is redistributed after unloading, thus making the waviness of the strip more apparent. This measure ensures that the measured strip shape is closer to the true natural strip shape, avoiding misjudgments where the measured state is correct but the waviness has not been released.

[0022] As a further aspect of the present invention: a vertically movable pressure hammer is provided at the top of the plate-shaped measuring area, and a pressure detection module is provided on the pressure hammer.

[0023] The pressure hammer applies a load within a preset range to the strip steel vertically, and the pressure detection module provides real-time feedback on the load magnitude, thereby ensuring consistency in each stress release process. This approach improves the standardization and safety of the method.

[0024] As a further aspect of the present invention: step S4 specifically includes: S4.1. Set multiple measuring strips along the width direction of the strip steel located in the strip shape measurement area; S4.2 In the same wave-shaped area, obtain the vertical distance from the valley bottom of each measurement zone to the line connecting the valley peaks at both ends of the corresponding measurement zone. This vertical distance is the relative wave height of each measurement zone. S4.3 The actual wave height is obtained by subtracting the minimum relative wave height from the relative wave height of each measurement zone.

[0025] By setting multiple measuring strips along the width of the strip and calculating the relative wave height of each strip within the same wave shape region, and then performing differential processing based on the minimum relative wave height, the overall sag is mathematically offset. This method achieves high-precision strip shape calculation without the need for a complex mechanical model, significantly improving the practicality of on-site measurements.

[0026] Another aspect of the present invention provides a measuring tool for implementing the above-described measuring method, comprising a reference rod, a measuring ruler, and a sliding sleeve, wherein the sliding sleeve is slidably connected to the reference rod and the measuring ruler, and the measuring ruler is perpendicular to the reference rod.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows: The leveling line consists of an uncoiling zone, a leveling machine, a strip shape measurement zone, and a coiling zone, forming a complete tension transmission path. In step S1, the leveling line is stopped and the uncoiling and coiling tensions are cut off, disrupting the continuous tension system during production. In step S2, a controlled low coiling tension is reintroduced to prevent complete strip de-tension. In step S3, residual stress in the strip within the strip shape measurement zone is further released, allowing the strip waviness to redistribute. Finally, strip shape data is collected in step S4.

[0028] By combining the above steps, this method enables accurate measurement of the natural shape of the finished strip at the export site without splitting, hoisting, or damaging the integrity of the steel coil. This method effectively avoids the problem of production tension masking shape defects, and also avoids the serious interference of strip sagging under zero tension on the measurement results. It provides a reliable data basis for adjusting leveling parameters and significantly improves the accuracy and stability of leveling shape control. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this drawing or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this drawing. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the overall structure of the leveling line of the present invention; Figure 2 This is a diagram showing the working state of the measuring tool of the present invention.

[0031] In the diagram: 1. Uncoiling area; 2. Leveling machine; 3. Plate shape measurement area; 31. Rotary roller; 32. Pressure hammer; 33. Pressure detection module; 4. Winding area; 5. Leveling exit straightener; 61. Reference rod; 62. Measuring ruler; 63. Sliding sleeve. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0033] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0034] However, there may be instances where unnecessary detailed descriptions are omitted. For example, detailed descriptions of well-known matters or repetitive descriptions of essentially the same structures may be omitted. This is to avoid unnecessarily lengthy descriptions and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand this application and are not intended to limit the subject matter of the claims.

[0035] Please see Figure 1As shown in the figure, in an embodiment of the present invention, a method for measuring the shape of a flattened exit strip includes a flattening line consisting of an uncoiling area 1, a flattening machine 2, a shape measuring area 3, and a coiling area 4 arranged sequentially along the strip conveying direction. The measurement method includes the following steps: Step 1: Stop the leveling line and cut off the uncoiling and coiling tensions. Before measuring the strip shape, first stop the leveling line and reduce the rolling speed of leveling mill 2 to zero, thereby interrupting the high-speed tension transmission continuously formed by the uncoiler, leveling mill 2, and coiler during production. Then, cut off the uncoiling and coiling tensions so that the strip is no longer in a production condition where it is forcibly straightened.

[0036] Step 2: Reduce the winding tension to the set value. Subsequently, by reducing the winding tension to the preset low tension range, the strip in the strip shape measurement area 3 is kept under necessary tension to avoid severe sagging caused by complete loss of tension, while also preventing excessive tension from masking the waviness defect.

[0037] Step 3: Release the residual stress in the strip steel in the shape measurement area 3. Again, by releasing the residual stress in the strip steel within the shape measurement area 3, the wave-like modes that have not yet fully manifested after flattening are redistributed, thereby gradually restoring the strip steel to its true shape, which is close to its natural state.

[0038] Step 4: Measure the strip shape data in strip shape measurement area 3. Finally, under the stable working conditions of low tension and fully released residual stress, strip shape data is collected in strip shape measurement area 3 to obtain accurate and controllable flattened exit strip shape information that is not affected by production tension and sag, providing a reliable basis for adjusting flattening parameters and evaluating strip shape quality.

[0039] Furthermore, a leveling exit straightener 5 is installed between the leveling machine 2 and the strip shape measurement area 3. During normal production, the leveling exit straightener 5 straightens the strip through the alternating bending action of multiple rollers. The roller system of the leveling exit straightener 5 not only applies continuous bending and reverse bending loads to the strip, but also forms additional tension constraints between the coiling area 4 and the leveling machine 2, so that the strip is always in a state of combined stress in the exit area.

[0040] After entering the strip shape measurement mode and performing the shutdown operation, the tension on the strip is released by lifting the leveling exit straightener 5, that is, the leveling exit straightener 5 is adjusted from the working state to the non-working state, so that the roller system no longer contacts the strip, thereby cutting off the mechanical clamping and additional damping effect of the straightener on the strip.

[0041] At this time, the strip tension between the coiling zone 4 and the leveler 2 is no longer affected by the straightener roller system. The coiling tension can act directly on the strip shape measurement zone 3 according to the preset value, making the stress state of the strip in the strip shape measurement zone 3 more singular and controllable, which is conducive to the full release of residual stress and the natural manifestation of the wave pattern.

[0042] In one embodiment, in step 1, after the leveling line stops, the rolling force of the leveling machine 2 on the strip remains unchanged. The high-rigidity clamping structure formed by the leveling machine 2 in a static state is used to effectively control the strip tension state under the condition of measuring the strip shape at the leveling exit.

[0043] Specifically, during normal production, the uncoiling tension of the strip, the rolling force of the leveler 2, and the coiling tension together constitute a continuous tension transmission system. Once the rolling force is released simultaneously after the machine stops, the strip will be in a state of overall freedom or semi-freeness, which is prone to relaxation and displacement at the front and back of the leveler 2, resulting in unstable sagging of the strip in the shape measurement area 3 and uncontrollable stress state.

[0044] Therefore, this invention maintains the roll gap of the leveler 2 unchanged when the machine is stopped, ensuring that the strip remains stably clamped between the work rolls. This structurally creates a tension isolation node in the leveler 2, effectively decoupling the tension states of the uncoiling and coiling sides. In this state, even if the tension on the coiling side is reduced to the low tension range required for strip shape measurement, the tension change will not be transmitted to the uncoiling side, avoiding overall sagging or shifting caused by the simultaneous relaxation of the entire strip.

[0045] In one embodiment, a pinch roller, a brake roller, or a hydraulic clamping mechanism is additionally provided at the outlet or inlet of the leveler 2 to introduce an additional mechanical means to fix the position of the strip, thereby cutting off the tension transmission.

[0046] In some embodiments, in step 2, the tension is set to 10kN-30kN. By limiting the range of the winding tension during the strip shape measurement process, a low-tension stress condition suitable for flattened exit strip shape measurement is constructed. Its core function is to establish a stable balance between the two unfavorable states of the strip being straightened by tension and sagging due to its own weight.

[0047] Specifically, under normal production conditions, the coiling tension is usually at a high level. Under this tension, the strip is forcibly stretched, and any waviness defects that still exist after flattening are masked by the tension, failing to accurately reflect the flattening effect. However, during shutdown measurements, if the coiling tension is excessively reduced or even completely released, the strip will sag significantly within the strip shape measurement area 3 due to its own weight. This is especially true for thin strips, where the sagging deformation will be significantly superimposed on the waviness, leading to distorted measurement results.

[0048] Therefore, the present invention limits the coiling tension during strip shape measurement to the range of 10kN-30kN, so that the strip steel in the strip shape measurement area 3 maintains the necessary axial tension to suppress overall sagging, and does not suppress the natural manifestation of waviness due to excessive tension, so that waviness defects can be fully exposed under controllable stress conditions.

[0049] In a further embodiment, when the thickness of the strip steel plate is ≤3mm, the winding tension is 10kN-17kN; when the thickness of the strip steel plate is >3mm and ≤4mm, the winding tension is 17kN-23kN; and when the thickness of the strip steel plate is >4mm, the winding tension is 23kN-30kN.

[0050] Thin-gauge strip (thickness ≤ 3mm) has low bending stiffness and light weight. If the tension is too high, the strip will be straightened, and waviness defects will not be visible. Therefore, a lower coiling tension is set, i.e., 10kN-17kN. Medium-gauge strip (thickness > 3mm and ≤ 4mm) has increased weight and stiffness, requiring a moderately increased coiling tension, i.e., 17kN–23kN, to prevent excessive sagging of the strip in the shape measurement area 3 while ensuring that waviness is visible. Thick-gauge strip (thickness > 4mm) has high weight and high stiffness. If the tension is too low, it will cause insufficient or uneven sagging in the shape measurement area 3. Therefore, the coiling tension is set to 23kN–30kN to maintain a stable stress state for the strip.

[0051] During the measurement process, by controlling the tension in segments, strips of different thicknesses can maintain a moderate mechanical balance in the plate shape measurement area 3, so that the wavy defects after the release of residual stress can be fully displayed and the data can be repeated.

[0052] In some embodiments, the two ends of the strip shape measurement area 3 are provided with rotating rollers 31 that contact the steel strip. Under low tension measurement conditions, the strip will sag due to its own weight. Without boundary constraints, the strip may exhibit local curling, twisting, or uneven deflection along the width direction in the strip shape measurement area 3, thereby affecting the true manifestation of the waviness.

[0053] By setting rotating rollers 31 at both ends of the strip shape measurement area 3, the two ends of the strip in the length direction are supported and guided, so that the strip in the strip shape measurement area 3 forms a stress state similar to a simply supported beam, and the overall sag is limited to a controllable range. At the same time, the strip does not generate excessive friction or displacement when it comes into contact with the measuring tool.

[0054] In one embodiment, in step 3, heat is applied to the strip in the shape measurement area 3 to achieve active release of residual stress in the strip and explicit expression of the shape mode.

[0055] In one embodiment, in step 3, by applying at least one external load to the top surface of the strip in the strip shape measurement area 3, the residual stress of the strip is actively released and the strip shape mode is made explicit. Specifically, even if the coiling tension has been reduced to the range required for measurement, the strip in the strip shape measurement area 3 may still maintain a temporarily stable wavy mode, which cannot truly reflect the strip shape characteristics under natural conditions. However, by applying an external load to the strip, the strip undergoes a local elastic or elastoplastic response, causing the internal residual stress to redistribute, thereby breaking the original local equilibrium of the wavy shape and allowing the strip shape to appear in its natural state.

[0056] It should be noted that the magnitude and method of this load application are intended to effectively trigger the release of internal stress in the strip without introducing new non-uniform stress or damaging the strip surface.

[0057] In one specific embodiment, an external load is applied by manually stepping on the top surface of the strip in the tread shape measurement area 3, thereby releasing the residual stress of the strip and making the waviness mode explicit. Furthermore, by manually stepping on the strip, the operator can feel the force feedback. If the strip remains noticeably taut when stepped on, it indicates that the tension is still too high and the strip shape is not yet in its natural state; if the strip sinks slightly or exhibits a moderately soft rebound, it indicates that the strip is in the ideal measurement state of being loose but not sagging.

[0058] In one specific embodiment, a vertically movable pressure hammer 32 is provided at the top of the strip shape measurement area 3, and a pressure detection module 33 is provided on the pressure hammer 32. The pressure hammer 32 applies a preset load to the strip steel vertically, causing local elastic or elastoplastic deformation of the strip steel in the strip shape measurement area 3, promoting the redistribution of internal residual stress, thereby making the strip steel waviness explicit. The pressure detection module 33 provides real-time feedback on the applied load magnitude, ensuring that each load application is within the target range, avoiding damage to the strip steel surface or the introduction of non-uniform stress due to excessive external force, while ensuring the consistency of the strip shape release process.

[0059] In some embodiments, step four specifically includes: Step 4.1: At the start of the strip shape measurement, the strip steel located in the strip shape measurement area 3 is first divided into multiple independent measurement zones along the width direction, so that the strip shape status at different width positions within the same corrugated area can be acquired separately.

[0060] Step 4.2: Subsequently, within the same wave-shaped area, for each measurement zone, measure the vertical distance between the valley bottom of the measurement zone and the line connecting the valley peaks at both ends of the measurement zone, thereby obtaining relative wave height data that includes the wave height and the overall sag height.

[0061] Step 4.3: Under low tension measurement conditions, the strip inevitably sags as a whole within the measurement area. However, the amount of sag is basically consistent across the same width section. The amplitude of the waviness defect caused by residual stress varies across different measurement zones. Therefore, after obtaining the relative waviness height of each measurement zone, the minimum relative waviness height is used as the sag reference value. This reference value is then subtracted from the relative waviness heights of the remaining measurement zones one by one. This process cancels out the overall sag component during the calculation, retaining only the true height difference caused by the plate-shaped waviness defect. Finally, the actual waviness height value corresponding to each measurement zone is obtained.

[0062] Please see Figure 2 As shown, another aspect of the present invention provides a measuring tool for implementing the above-described measuring method, including a reference rod 61, a measuring ruler 62, and a sliding sleeve 63. The sliding sleeve 63 is slidably connected to the reference rod 61 and the measuring ruler 62, respectively, and the measuring ruler 62 is perpendicular to the reference rod 61.

[0063] During actual measurement, the reference rod 61 serves as a stable reference benchmark, resting against the two peaks of the corrugated steel strip to establish a unified measurement starting point and direction. The sliding sleeve 63 is slidably connected to both the reference rod 61 and the measuring scale 62. During measurement, it can move along the direction of the reference rod 61, synchronously causing the measuring scale 62 to change position, thus achieving a stable linkage between the reference direction and the measurement direction. The measuring scale 62 is arranged perpendicularly to the reference rod 61, enabling the measuring scale 62 to accurately read the height difference of the measured object in a direction perpendicular to the reference, avoiding numerical deviations caused by tilted measurements.

[0064] With the above-mentioned structural cooperation, the measuring personnel only need to adjust the sliding sleeve 63 to make the measuring ruler 62 contact the measured position (valley) to directly obtain the corresponding measurement value and complete the judgment process accordingly. This realizes the transformation from subjective experience judgment to objective and repeatable quantitative measurement, and improves the consistency and reliability of measurement results.

[0065] In one specific embodiment, the strip steel located in the strip shape measurement area 3 is divided into three independent measurement zones along its width. A measuring rod 61 is placed on each of the three measurement zones, and a measuring ruler 62 is used to measure the vertical distances between the strip steel and the measuring rod, i.e., wave height a, wave height b, and wave height c. When the manually measured wave height a is 4mm, wave height b is 5mm, and wave height c is 6mm, wave height a should be considered as the measurement strip shape reference, i.e., wave height a can be considered as 0mm. Then wave height b and wave height c are 1mm and 2mm respectively, and there are two wave shapes of 1mm and 2mm respectively. If the manually measured wave height a is 4mm, wave height b is 8mm, and wave height c is 4mm, then wave height a (which is 0mm) can be considered as the measurement strip shape reference, wave height b is 4mm, and wave height c is 0mm, i.e., there is one wave shape of 4mm.

[0066] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A method for measuring the shape of flattened export strip steel, characterized in that, include: A leveling line consisting of an uncoiling area (1), a leveling machine (2), a strip shape measurement area (3), and a coiling area (4) arranged sequentially along the strip conveying direction; The measurement method includes the following steps: S1. The leveling line is stopped, and the unwinding tension and winding tension are cut off. S2. Reduce the winding tension to the set value; S3. Release the residual stress in the strip steel in the plate shape measurement area; S4. Measure the plate shape data of the plate shape measurement area.

2. The method for measuring the shape of flattened export strip steel according to claim 1, characterized in that, A leveling outlet straightening machine (5) is installed between the leveling machine (2) and the plate shape measurement area (3); In step S1, after cutting off the uncoiling tension and the winding tension, the flat exit straightener (5) releases the tension of the strip.

3. The method for measuring the shape of flattened export strip steel according to claim 1, characterized in that, In step S1, after the leveling line stops, the leveling machine (2) maintains the rolling force on the strip steel, thereby cutting off the uncoiling tension and the coiling tension.

4. The method for measuring the shape of flattened export strip steel according to claim 1, characterized in that, In step S2, the tension is set to 10kN-30kN.

5. The method for measuring the shape of flattened export strip steel according to claim 4, characterized in that, When the thickness of the strip steel plate is ≤3mm, the winding tension is 10kN-17kN; when the thickness of the strip steel plate is >3mm and ≤4mm, the winding tension is 17kN-23kN; when the thickness of the strip steel plate is >4mm, the winding tension is 23kN-30kN.

6. The method for measuring the shape of flattened export strip steel according to claim 1, characterized in that, Rollers (31) that contact the steel strip are provided at both ends of the plate shape measuring area (3).

7. The method for measuring the shape of flattened export strip steel according to claim 6, characterized in that, In step S3, the residual stress in the strip in the shape measurement area is released by applying a load to the top surface of the strip at least once.

8. The method for measuring the shape of flattened export strip steel according to claim 7, characterized in that, The top of the plate-shaped measuring area (3) is equipped with a vertically movable pressure hammer (32), and the pressure hammer (31) is equipped with a pressure detection module (33).

9. The method for measuring the shape of flattened export strip steel according to claim 1, characterized in that, Step S4 specifically includes: S4.

1. Set multiple measuring strips along the width direction of the strip steel located in the strip shape measurement area; S4.2 In the same wave-shaped area, obtain the vertical distance from the valley bottom of each measurement zone to the line connecting the valley peaks at both ends of the corresponding measurement zone. This vertical distance is the relative wave height of each measurement zone. S4.3 The actual wave height is obtained by subtracting the minimum relative wave height from the relative wave height of each measurement zone.

10. A measuring tool for implementing the measuring method as described in claim 9, characterized in that, It includes a reference rod (61), a measuring ruler (62) and a sliding sleeve (63). The sliding sleeve (63) is slidably connected to the reference rod (61) and the measuring ruler (62) respectively. The measuring ruler (62) is perpendicular to the reference rod (61).

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