A steel strip on-line s-bend detection device and detection method

Abstract

The application provides a steel strip on-line S-bend detection device and detection method. The steel strip on-line S-bend detection device comprises a base assembly, a detection frame and a micrometer. The lower end of the detection frame is hinged to the base assembly, and the upper end of the detection frame is a detection end. An included angle is formed between the detection end and the vertical direction of the base assembly, and the angle value of the included angle can be adjusted. One end of the detection end is an entrance, and the other end is an exit. The connecting line between the entrance and the exit forms the running direction of the steel strip. At least two positioning wheels are arranged on one side of the detection end, and clamping wheels corresponding to the positioning wheels are arranged on the other side of the detection end. A micrometer is further arranged on the detection end. The micrometer is arranged on one side of the clamping wheel, and the detection head on the micrometer can move towards the positioning wheels. The application realizes on-line detection, improves production efficiency and reduces labor intensity.

Description

Technical Field

[0001] This invention relates to the field of steel strip testing technology, and in particular to an online S-bend testing device and method for steel strips. Background Technology

[0002] Currently, steel strip manufacturing industries, such as saw blade production, require cold rolling of steel strips due to process requirements, followed by a leveling and straightening process. While leveling and straightening can improve the straightness and flatness of long-distance bends, the straightness of short-distance S-bends is determined by the preceding cold rolling process. Therefore, to ensure the accuracy of S-bend measurements, S-bend testing is generally performed after leveling and straightening to check whether the straightness of the cold-rolled steel strip in the previous process meets the requirements for short distances.

[0003] like Figure 1 As shown, the existing S-bend detection method is as follows: A manual inspection table is set up, and two positioning wheels 53 are set on the manual inspection table, with the two positioning wheels 53 separated by L1 = 500mm. A dial indicator 9 is set between the two positioning wheels 53. First, during the leveling and straightening production process, a section is cut from the middle of the leveled and straightened steel strip coil, such as L2 = 6m. This section is taken to the manual inspection table, and the steel strip 8 is placed on the manual inspection table, with one end face abutting against the positioning wheel 53. The left end of the steel strip 8 extends slightly beyond the positioning wheel 53. The operator presses the steel strip 8 with both hands and makes it fit against the positioning wheel 53. At the first point, the dial indicator is manually zeroed and "0 mm" is recorded. Then, the steel strip 8 is pressed against the positioning wheel 53 with both hands and slid to the left. Every few centimeters of sliding, a dial indicator reading is recorded. The reading is positive when the steel strip 8 between L1 bends downwards and negative when bends upwards. When the right end of the steel strip with a length of L2 slides to the right positioning wheel, the last data is recorded. After all the data is recorded, the range of this data column is calculated, which yields an important parameter for the short-distance straightness of the steel strip: the "S-bend value". For example, in a certain data record: maximum +15, minimum -15, then the S-bend value = +15 - (-15) = 30 mils.

[0004] The above-mentioned detection method is manual inspection, which has the following disadvantages:

[0005] First, human error is significant. The pressure applied by hand cannot be consistent at all times; a looser pressure results in a lower reading, while a tighter pressure results in a higher reading.

[0006] Second, the testing efficiency is low and the labor intensity is high. The cutting, transfer, clamping, sliding and data recording of the steel strip all need to be done manually. Especially when dealing with wide and thick strips, cutting alone is very laborious and time-consuming.

[0007] Third, steel strip is wasted. The product yield is reduced, and the steel strip cut for inspection needs to be scrapped after inspection.

[0008] Fourth, additional weld joints are required. A roll of steel strip needs to be cut in the middle for inspection, and subsequent processes need to re-weld it, which reduces the production efficiency of subsequent processes and also affects the quality of the product.

[0009] 5. Do not arbitrarily test multiple S-bends. The S-bends of different sections of a roll of steel strip are different, but once a section of a roll of steel strip has been cut off, it should generally not be cut again, otherwise it will further seriously affect product quality and yield.

[0010] VI. Limited data acquisition. For a single section of steel strip being inspected, only a limited number of data points, typically a dozen or so, can be obtained visually. Summary of the Invention

[0011] The purpose of this invention is to provide an online S-bend detection device and method for steel strip, which can realize the complete and continuous detection of the entire steel strip coil, without causing waste of steel strip and reducing detection errors.

[0012] The technical solution of the present invention is as follows: A steel strip online S-bend detection device includes a base assembly, a detection frame, and a dial indicator. The lower end of the detection frame is hinged to the base assembly, and the upper end of the detection frame is a detection end for the steel strip to pass through. An angle is formed between the detection end and the vertical direction of the base assembly, and the angle value is adjustable. One end of the detection end is an inlet for the steel strip to enter, and the other end is an outlet. The line connecting the inlet and outlet forms the traveling direction of the steel strip. The detection end has at least two positioning wheels on one side perpendicular to the traveling direction, and a clamping wheel that can move towards the positioning wheels on the other side. The clamping wheel and the positioning wheel are arranged in a one-to-one correspondence. The detection end is also equipped with a dial indicator, which is located on one side of the clamping wheel, and the detection head on it can move towards the positioning wheel.

[0013] In the above scheme, in addition to the two positioning wheels, two clamping wheels replace the left and right hands in the manual inspection method to tighten the steel belt. The clamping force is stabilized at a constant level by the air pressure, ensuring that each test data is obtained under the same conditions, which greatly improves the accuracy of the test.

[0014] Preferably, the detection end is further provided with an upper pressure roller; the upper pressure roller is located on one side of the clamping roller and can move synchronously with the clamping roller toward the positioning roller, and the upper pressure roller can prevent the steel belt from jumping during the movement.

[0015] Preferably, the testing frame further includes a slide block and a slide rod, the slide rod being mounted on the testing end perpendicular to the direction of the steel strip's travel, and the slide block being slidably mounted on the slide rod; at least two of the clamping wheels and the upper pressure wheel are disposed on the slide block.

[0016] Preferably, the testing frame further includes a pressure roller seat and an adjusting rod. The lower end of the pressure roller seat is connected to the slide, and the upper end is threaded to the adjusting rod. The upper pressure roller is located on the front end of the adjusting rod. According to the different requirements of the width specifications of the steel strip to be tested, the front and rear positions of the upper pressure roller can be adjusted to a suitable position in advance.

[0017] Preferably, the dial indicator is located in the middle of the detection end, the upper pressure roller is separately set at both ends of the dial indicator, and the positioning roller is set on the outside of the upper pressure roller.

[0018] Preferably, the testing frame further includes a plurality of lower support rollers mounted on the testing end, the lower support rollers being able to generate a supporting force opposite to the tension of the steel strip.

[0019] This invention also provides a method for online S-bend detection of steel strip, comprising:

[0020] The method sets the unit measurement length L of the steel strip and the speed at which the steel strip travels; it provides a detection end and a dial indicator for detecting the steel strip; it sets two positioning references on the detection end, the distance between the two positioning references being equal to the set length L; the steel strip has a positioning surface and a detection surface arranged opposite to each other, the positioning surface of the steel strip resting against the positioning references, and the detection surface of the steel strip bearing a clamping force moving towards the positioning references; the steel strip travels from the detection end at a set speed in an upward inclined direction; the dial indicator captures data on the straightness of the detection surface during the movement of the steel strip; it records the captured straightness in real time; and it calculates the S-bend value from the recorded straightness data.

[0021] Preferably, the time interval for the dial indicator to capture the data is set, and the S-bend value is calculated based on this time interval, the traveling speed of the steel strip, and the straightness data captured in real time.

[0022] Preferably, the positioning reference has adjustable degrees of freedom in the X, Y, and Z directions in a three-dimensional rectangular coordinate system, so that the positioning reference is adapted to the position of the steel strip.

[0023] Preferably, during the movement of the steel strip, a clamping force is applied to the steel strip to press against the detection end; under the tension of the steel strip during operation, the tilt angle of the detection end automatically swings up and down, ensuring that the tilt angle of the detection end always remains consistent with the angle of the steel strip's movement. The change in the coil diameter of the steel strip causes the detection end to swing up and down, gradually tilting the exit of the detection end upwards. The change in coil diameter refers to the increasing diameter of the coiled steel strip, resulting in a more upward tilt of the detection end.

[0024] Compared with related technologies, the beneficial effects of the present invention are as follows:

[0025] 1. The aforementioned online S-bend detection device for steel strip enables online detection, improving production efficiency while reducing labor intensity;

[0026] 2. The online S-bend detection method for steel strip does not require cutting the steel strip, avoids waste and does not require additional welds, and can detect and automatically obtain the S-bend value of any segment or the entire segment at any time and save it to the computer.

[0027] Third, the amount of data acquired far exceeds that of manual inspection. For the same inspection length, such as 6 meters, the online inspection method can acquire over 300 data points by setting a time interval for data capture. Furthermore, compared to manual inspection's accuracy to 1 micrometer, online inspection's data is accurate to 0.1 micrometers. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the existing manual inspection method for S-bends of steel strips.

[0029] Figure 2 A three-dimensional structural schematic diagram of the online S-bend detection device for steel strip provided by the present invention;

[0030] Figure 3 A top view schematic diagram of the online S-bend detection device for steel strip provided by the present invention;

[0031] Figure 4 This is a schematic diagram showing an S-bend in the steel strip.

[0032] In the attached diagram: 1. Y-axis base; 2. X-axis base; 3. Z-axis vertical base; 4. Lifting base; 5. Testing frame; 6. Dial indicator; 7. Base assembly; 8. Steel strip; 9. Dial indicator;

[0033] 21. First locking cylinder; 31. Second locking cylinder; 41. Lifting cylinder; 51. Lower support roller; 52. Upper pressure roller; 53. Positioning roller; 54. Clamping roller; 55. Clamping cylinder; 56. Angle adjustment rod; 57. Slide seat; 58. Slide rod; 59. Detection end; 510. Pressure roller seat; 511. Adjusting rod; 591. Outlet; 592. Inlet. Detailed Implementation

[0034] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" used below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0035] like Figure 2 , Figure 3 As shown, the online S-bend detection device for steel strip provided in this embodiment includes a base assembly 7, a detection frame 5, and a dial indicator 6.

[0036] The base assembly 7 includes a Y-axis base 1, an X-axis base 2, a Z-axis vertical seat 3, and a lifting seat 4. The X-axis base 2 is slidably mounted on the Y-axis base 1, providing the X-axis base 2 with a sliding degree of freedom in the Y direction via the Y-axis base 1. The Z-axis vertical seat 3 is slidably mounted on the X-axis base 2, providing the Z-axis vertical seat 3 with a sliding degree of freedom in the X direction via the X-axis base 2. The X-axis base 2 is equipped with a first locking cylinder 21 for engaging with the Y-axis base 1 to lock the relative position of the X-axis base 2. The Z-axis vertical seat 3 is equipped with a second locking cylinder 31 for engaging with the X-axis base 2 to lock the relative position of the Z-axis vertical seat 3. The Z-axis vertical seat is equipped with a lifting cylinder 41, and the lifting seat 4 is slidably mounted on the upper end of the Z-axis vertical seat, with its bottom contacting and connected to the telescopic rod of the lifting cylinder 41. The top of the lifting seat 4 is hinged to the testing frame 5. The base assembly 7 allows the detection end 59 to be displaced in the X, Y, and Z directions in a three-dimensional Cartesian coordinate system, to adapt to the online detection requirements of S-bends of different specifications and steel strips 8 under different working conditions. The X-axis base 2 and Y-axis base 1 are movable to achieve movement in the X and Y directions, so that the detection device is always located directly below the steel strip with the positioning wheel 53 as the reference.

[0037] The testing frame 5 includes a lower support roller 51, an upper pressure roller 52, a positioning roller 53, a clamping roller 54, a clamping cylinder 55, an angle adjustment rod 56, a slide block 57, a slide rod 58, a testing end 59, a pressure roller seat 510, and an adjustment rod 511.

[0038] The upper end of the inspection frame 5 is an inspection end 59 for the steel strip 8 to pass through, and the inspection end 59 provides a platform for online inspection of the steel strip 8. One end of the inspection end 59 is an inlet 592 for the steel strip to enter, and the other end is an outlet 591. The line connecting the inlet 592 and the outlet 591 forms the travel direction of the steel strip. The inspection end 59 has at least two positioning wheels 53 on one side perpendicular to the travel direction, and a clamping wheel 54 that can move towards the positioning wheels 53 on the other side. The clamping wheel 54 is arranged in a one-to-one correspondence with the positioning wheel 53. The inspection end 59 is also equipped with a dial indicator 6, which is located on one side of the clamping wheel 54, and its inspection head can move towards the positioning wheel 53.

[0039] The slide rod 58 is mounted on the detection end 59 perpendicular to the direction of the steel strip's travel, and the line connecting the slide rod 58, the positioning wheel 53, and the clamping wheel 54 is parallel to each other. The slide block 57 is slidably mounted on the slide rod 58. The clamping cylinder 55 is connected to the slide block 57 and drives the slide block 57 to slide, thereby driving the clamping wheel 54 and the upper pressure wheel 52 on the slide block 57 to move together towards the positioning wheel 53. The dial indicator 6 is located in the middle of the detection end 59, and the upper pressure wheel 52 is separately arranged at both ends of the dial indicator 6. The pressure wheel seat 510 has a Z-shaped structure, with its lower end connected to the slide block 57 and its upper end threadedly connected to the adjusting rod 511. The upper pressure wheel 52 is rotatably mounted on the adjusting rod 511. The adjusting rod 511 can adjust the front and rear position of the upper pressure wheel 52 to suit different specifications of strip material and prevent possible jumping of the strip material during operation. The clamping wheels 54 are located at both ends of the slide block 57.

[0040] The positioning wheel 53 is disposed on the outside of the upper pressure wheel 52. Multiple lower support wheels 51 are spaced apart on the detection end 59. The lower support wheels 51 are used to apply a supporting force to the steel belt 8, interacting with and reacting with the tension generated by the steel belt 8 during operation. The lower support wheels 51 and the upper pressure wheel 52 cooperate to tighten the steel belt 8 and keep it constantly positioned between the lower support wheels 51 and the upper pressure wheel 52, ensuring that the steel belt 8 does not detach from the dial indicator 6 probe due to jumping or other reasons.

[0041] The angle adjustment rod 56 hinges the lifting seat 4 and the detection frame 5, creating an angle between the detection end 59 and the vertical direction of the lifting seat 4. This angle is adjustable. The angle adjustment rod 56 is a threaded rod with a nut at the other end. When the angle adjustment rod 56 and the nut are tightened, the detection frame 5 and the lifting seat 4 are locked together. During operation, the steel strip 8 needs to be rewound using a rewinding machine. During rewinding, the diameter of the steel strip gradually increases, causing the angle of the steel strip 8 at the outlet 591 to become increasingly larger, i.e., the outlet 591 gradually tilts upwards. At this time, because the upper pressure roller 52 and the lower support roller 51 clamp the steel strip 8, when the angle of the steel strip 8 changes, it can overcome the locking force of the angle adjustment rod 56, causing the detection end 59 to tilt and swing, thus achieving automatic adjustment of the angle of the detection frame 5. The connection between the detection frame 5 and the lifting seat 4 is hinged, allowing the angle to change constantly according to the angle of the steel strip 8 during operation, ensuring good contact between the steel strip 8 and the detection frame 5.

[0042] This invention also provides a method for online S-bend detection of steel strip, comprising:

[0043] The system sets the unit measurement length L of the steel strip, the travel speed of the steel strip 8, and the time interval for the dial indicator 6 to grip the strip. It provides a detection end 59 and a dial indicator 6 for detecting the steel strip. Two positioning references are set on the detection end 59, with the distance between them equal to the set length L (the distance between A and B formed by the two positioning wheels 53). The steel strip 8 has a positioning surface and a detection surface arranged opposite to each other. The positioning surface of the steel strip 8 rests against the positioning references, and the detection surface of the steel strip 8 is subjected to a clamping force moving towards the positioning references. The steel strip 8 travels from the detection end 59 at a set speed in an upward inclined direction. The dial indicator 6 captures data on the straightness of the detection surface during the travel of the steel strip 8. The captured straightness is recorded in real time. The recorded straightness data is combined with the time interval and the travel speed of the steel strip 8 to calculate the S-bend value.

[0044] like Figure 4 As shown, +& represents the positive extreme value of the steel strip, -& represents the negative extreme value of the steel strip, and the S-bend value of the steel strip = positive extreme value - negative extreme value.

[0045] After passing through the leveling and straightening machine, the steel strip 8 becomes flat, making it a reliable place to measure its short-distance straightness, i.e., the S-bend value. The purpose is to determine whether the semi-finished product from the preceding cold-rolling process meets quality requirements, thus guiding the adjustment of cold-rolling parameters. The online S-bend detection equipment of this invention is set up between the buffer counterweight device of the leveling and straightening machine and the rewinding machine. The steel strip 8 passes through the machine under the clamping of the positioning wheel 53, clamping cylinder 55, and clamping wheel 54. The dial indicator 6 is positioned between the two clamping wheels 54 and slides together with them. When the clamping wheels 54 clamp the steel strip 8, the probe of the dial indicator 6 is also pressed against one side of the steel strip 8 by elastic force. Before the test begins, the dial indicator 6 can be automatically zeroed on the computer. During the test, the dial indicator 6 periodically captures the straightness fluctuation data of the steel strip 8 at set time intervals and records it completely on the computer. The computer automatically converts the data fluctuation range (difference between extreme values) within the specified length of meters based on the steel strip's running speed, the data acquisition time interval, and the amount of data acquired. This difference between extreme values ​​is the measured S-bend value (e.g., ...). Figure 4 (As shown). Real-time monitoring of the S-bends of the entire steel strip roll can be achieved as needed, or random sampling inspection of several sections of the S-bends can be performed. The dial indicator 6 needs to be calibrated before testing and can only be used after passing the inspection.

[0046] like Figure 4As shown, the online S-bend detection device for steel strip is used to continuously measure the range of straightness deviation of steel strip 8 every 500mm length (between A and B). During detection, the detection frame 5 is first adjusted and locked in the X and Y directions. The computer is turned on, and the clamping wheel 54 and dial indicator 6 are moved together to clamp the steel strip 8. The dial indicator 6 is zeroed and begins to capture straightness data. The time interval for each data capture can be set in the software according to process requirements. Based on the minimum length of the S-bend to be measured and the running speed of the steel strip specified in the process, the computer automatically calculates the S-bend value (difference between extreme values) of the steel strip within the specified measurement length range and records it in real time for display on the computer.

[0047] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A steel strip online S-bend detection device, characterized in that, The system includes a base assembly (7), a testing frame (5), and a dial indicator (6). The lower end of the testing frame (5) is hinged to the base assembly (7), and the upper end of the testing frame (5) is a testing end (59) for the steel strip to pass through. The testing end (59) forms an angle with the vertical direction of the base assembly (7), and the angle value is adjustable. One end of the testing end (59) is an inlet (592) for the steel strip to enter, and the other end is an outlet (591). The line connecting the inlet (592) and the outlet (591) is... The direction of travel of the steel strip; the detection end (59) is provided with at least two positioning wheels (53) on one side perpendicular to the direction of travel, and a clamping wheel (54) on the other side. The clamping wheel (54) is moved closer to or away from the positioning wheel (53) by a clamping cylinder (55). The clamping wheel (54) and the positioning wheel (53) are arranged in a one-to-one correspondence; the detection end (59) is also provided with a dial indicator (6). The dial indicator (6) is arranged on one side of the clamping wheel (54), and the probe on it can move towards the positioning wheel (53); The detection end (59) is also provided with an upper pressure roller (52); the upper pressure roller (52) is located on one side of the clamping roller (54) and can move synchronously with the clamping roller toward the positioning roller (53), and the clamping roller (54) can generate a downward clamping force; the detection frame (5) also includes a slide (57) and a slide rod (58), the slide rod (58) is installed on the detection end (59) perpendicular to the direction of the steel strip travel, and the slide (57) is slidably installed on the slide rod (58); at least two clamping rollers (54) and upper pressure rollers (52) are all located on the slide (57); the detection frame (5) also includes a pressure roller seat (510) and an adjusting rod (511), the lower end of the pressure roller seat (510) is connected to the slide (57), and the upper end is threadedly connected to the adjusting rod (511), and the upper pressure roller (52) is rotatably mounted on the adjusting rod (511); Two positioning references are set on the detection end (59), and the positioning references have three degrees of freedom for adjustment in the X, Y and Z directions in a three-dimensional rectangular coordinate system.

2. The online S-bend detection device for steel strip according to claim 1, characterized in that, The dial indicator (6) is located in the middle of the detection end (59), the upper pressure roller (52) is set separately at both ends of the dial indicator (6), and the positioning roller (53) is set on the outside of the upper pressure roller (52).

3. The online S-bend detection device for steel strip according to claim 1, characterized in that, The testing frame (5) also includes a plurality of lower support rollers (51) installed on the testing end (59), the lower support rollers (51) having a support force opposite to the tension force of the steel strip.

4. A method for online S-bend detection of steel strip, comprising using the online S-bend detection device for steel strip as described in any one of claims 1-3, characterized in that, include: Set the unit measurement length L of the steel strip and the speed of the steel strip (8); A detection end (59) and a dial indicator (6) are provided for detecting the steel strip; the distance between the two positioning references on the detection end (59) is equal to a set length L; the steel strip (8) has a positioning surface and a detection surface arranged opposite to each other, the positioning surface of the steel strip (8) rests against the positioning reference, and the detection surface of the steel strip (8) is subjected to a clamping force that moves toward the positioning reference; the steel strip (8) moves from the detection end (59) at a set speed in an upward inclined direction; the dial indicator (6) captures data on the straightness of the detection surface during the movement of the steel strip (8); the captured straightness is recorded in real time; and the S-bend value is calculated from the recorded straightness data.

5. The online S-bend detection method for steel strip according to claim 4, characterized in that, Set the time interval for the dial indicator (6) to capture the value, and calculate the S-bend value based on the time interval, the travel speed of the steel strip (8), and the straightness data captured in real time.

6. The online S-bend detection method for steel strip according to claim 4, characterized in that, The positioning reference is adapted to the position of the steel strip (8).

7. The online S-bend detection method for steel strip according to claim 4, characterized in that, When the steel belt (8) is moving, a pressing force is applied to the steel belt (8) to fit against the detection end (59); under the tension of the steel belt (8) during operation, the tilt angle of the detection end (59) is automatically tilted and swung, so that the tilt angle of the detection end (59) is always consistent with the angle of the steel belt.

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