An online detection device for the width of aluminum coils

Abstract

This invention proposes an online aluminum coil width detection device, including a width detection frame located at the strip transport path. The width detection frame includes a horizontally arranged slide rail; two laser sensors supported by sliding blocks are arranged in pairs at the slide rail; the sliding blocks are connected to a drive mechanism. When the strip head of the aluminum coil reaches the width detection frame, the drive mechanism drives the sliding blocks to move, moving the two laser sensors to the two sides of the strip respectively, and scanning the strip edges. This invention can accurately measure the width of the strip after deformation at the cleaning, stretching, and straightening machine through real-time online detection data.

Description

Technical Field

[0001] This utility model relates to the field of aluminum alloy strip processing, manufacturing and packaging technology, and in particular to an online detection device for the width of aluminum coils. Background Technology

[0002] In the original design, if the disc shear on the final cleaning, stretching and straightening machine of the aluminum coil is used to cut directly according to the customer's requirements, the actual width of the finished product may differ from the required width.

[0003] The reason is that if the strip is thin, it may undergo large deformation after being stretched and straightened, which will also cause the width of the strip to extend. Moreover, the deformation range has a certain degree of randomness. How to solve the problem of accurately measuring the strip after deformation is a research direction. Utility Model Content

[0004] This invention proposes an online detection device for aluminum coil width, which can accurately measure the width of the strip after deformation at the cleaning, stretching and straightening machine through real-time online detection data.

[0005] The present invention adopts the following technical solution.

[0006] An online aluminum coil width detection device includes a width detection frame located at the strip transport path. The width detection frame includes a horizontally arranged slide rail. Two laser sensors supported by a sliding block are arranged in pairs at the slide rail. The sliding block is connected to a drive mechanism. When the strip head of the aluminum coil reaches the width detection frame, the drive mechanism drives the sliding block to move, moving the two laser sensors to the two sides of the strip respectively to scan the edges of the strip.

[0007] A pair of tension rollers are provided in the input direction of the strip width detection frame. When the strip passes through the tension rollers, the strip and the rollers form a wrap angle of more than 180 degrees so that the strip forms the extension required for detection to ensure detection accuracy.

[0008] The drive mechanism includes a servo motor, which is connected to the slide block via a lead screw to drive the slide block to slide along the slide rail.

[0009] The detection device is connected to the encoder inside the servo motor.

[0010] The laser sensor includes a vertically arranged transmitter and receiver. When the two laser sensors move to the two sides of the strip, a detection position is formed between the transmitter and receiver to allow the edge of the strip to pass through. When the strip passes through the detection position, the strip is located in the middle area between the transmitter and receiver.

[0011] The transmitting end is equipped with a laser strip composed of laser point sources. The laser strip emits a highly collimated parallel beam towards the receiving end to ensure the stability of the laser optical path through the coherence of the laser and reduce ambient light interference.

[0012] The receiver head includes a linear CCD. When the laser emitted by the transmitter is blocked by the strip and forms a clearly defined shadow area at the linear CCD, the width of the shadow area corresponds to the number of pixels of the linear CCD.

[0013] The maximum measurement range of both the left and right laser sensors is 14mm.

[0014] The drive mechanism is equipped with a maximum limit position, a minimum limit position, a reference limit position, and an original limit position. When the width measuring mechanism at the drive slide moves, the maximum limit position and the minimum limit position prevent the width measuring mechanism from going out of the screw limit.

[0015] When the width measuring mechanism stops, the drive mechanism provides a stopping position to the width measuring mechanism using the original limit component.

[0016] When the width measuring mechanism needs to be recalibrated to correct the error, the drive mechanism provides a calibration reference to the width measuring mechanism with a reference limit component.

[0017] To ensure that the strip width detection data is not affected by poor strip shape fluctuations at the strip edge, this utility model has made a special selection in the installation position of the online strip width detection scheme. It is selected at the positive exit position of a pair of tension rollers, so that the strip and the rollers form a wrap angle of more than 180 degrees, and the strip has sufficient extension, thus ensuring the detection accuracy.

[0018] This invention uses real-time online detection data to accurately measure the width of the strip after deformation at the cleaning, stretching, and straightening machine. Attached Figure Description

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0020] Appendix Figure 1 This is a schematic diagram of the width measuring mechanism of this utility model;

[0021] Appendix Figure 2 This is a schematic diagram illustrating the measurement principle of laser width measurement according to this utility model;

[0022] Appendix Figure 3 This is a schematic diagram of the plate width detection frame of this utility model;

[0023] Appendix Figure 4 This is a top view schematic diagram of the online aluminum coil width detection device and the tensioning roller group;

[0024] Appendix Figure 5This is a schematic diagram illustrating the principle of how this utility model collaborates with an external compensation mechanism;

[0025] Appendix Figure 6 This is a side view schematic diagram of the plate width measuring mechanism and tension roller assembly;

[0026] In the diagram: 1-Strip; 2-Laser sensor; 3-Slide; 4-Slide rail; 5-Panel width detection frame. Detailed Implementation

[0027] As shown in the figure, an online aluminum coil width detection device includes a width detection frame 5 located at the strip transport path. The width detection frame includes a horizontally arranged slide rail 4. Two laser sensors 2 supported by sliding blocks are arranged in pairs at the slide rail. The sliding blocks 3 are connected to a driving mechanism. When the strip head of the aluminum coil reaches the width detection frame, the driving mechanism drives the sliding blocks to move, moving the two laser sensors to the two sides of the strip respectively to scan the edges of the strip.

[0028] A pair of tension rollers are provided in the input direction of the strip width detection frame. When the strip passes through the tension rollers, the strip 1 and the rollers form a wrap angle of more than 180 degrees so that the strip forms the extension required for detection to ensure detection accuracy.

[0029] The drive mechanism includes a servo motor, which is connected to the slide block via a lead screw to drive the slide block to slide along the slide rail.

[0030] The detection device is connected to the encoder inside the servo motor.

[0031] The laser sensor includes a vertically arranged transmitter and receiver. When the two laser sensors move to the two sides of the strip, a detection position is formed between the transmitter and receiver to allow the edge of the strip to pass through. When the strip passes through the detection position, the strip is located in the middle area between the transmitter and receiver.

[0032] The transmitting end is equipped with a laser strip composed of laser point sources. The laser strip emits a highly collimated parallel beam towards the receiving end to ensure the stability of the laser optical path through the coherence of the laser and reduce ambient light interference.

[0033] The receiver head includes a linear CCD. When the laser emitted by the transmitter is blocked by the strip and forms a clearly defined shadow area at the linear CCD, the width of the shadow area corresponds to the number of pixels of the linear CCD.

[0034] The maximum measurement range of both the left and right laser sensors is 14mm.

[0035] The drive mechanism is equipped with a maximum limit position, a minimum limit position, a reference limit position, and an original limit position. When the width measuring mechanism at the drive slide moves, the maximum limit position and the minimum limit position prevent the width measuring mechanism from going out of the screw limit.

[0036] When the width measuring mechanism stops, the drive mechanism provides a stopping position to the width measuring mechanism using the original limit component.

[0037] When the width measuring mechanism needs to be recalibrated to correct the error, the drive mechanism provides a calibration reference to the width measuring mechanism with a reference limit component.

[0038] Example 1:

[0039] An online aluminum coil width detection device uses a combined measurement method that measures the reference width and deviation of the aluminum coil. The device is hardware-based and specifically involves: first, moving a laser sensor to an available detection position on both sides of the strip at the production line according to the material width data signal given by the aluminum coil production line; using the total travel of the laser sensor as the theoretical width Lset of the coil; then, using the laser sensor to vertically scan the edge of the strip passing the detection position to measure the width deviation ΔL / 2; and finally, adding the deviation ΔL / 2 to the theoretical width Lset to obtain the final strip width Lact.

[0040] The plate width Lact is expressed by the formula Lact=Lset+2(ΔL / 2).

[0041] The linear CCD converts the received light signal into a charge signal through its photosensitive unit, and then transfers the charge signal line by line to the output terminal of the linear CCD through its CCD driving circuit. Then, the analog-to-digital conversion circuit generates a voltage signal for the detection device to calculate in real time the boundary coordinates of the shadow area.

[0042] The number of pixels (S) formed by the laser parallel beam blocked by the strip material is counted by an external digital circuit. Combined with the physical size of a single pixel (Δl) and the optical magnification (M), the formula for calculating the width deviation value ΔL / 2 of the actual strip material blocking the laser is as follows:

[0043] ΔL / 2=(Δl*S) / M;

[0044] When measuring the width deviation value ΔL / 2, the left and right sides are divided by the central axis of the strip edge profile. The laser sensor on the left measures ΔL / 2 with negative values ​​to the right from 0 and positive values ​​to the left. The laser sensor on the right measures ΔL / 2 with negative values ​​to the left from 0 and positive values ​​to the right.

[0045] The maximum measurement range of both the left and right laser sensors is 14mm.

[0046] The drive mechanism is equipped with a maximum limit position, a minimum limit position, a reference limit position, and an original limit position. When the width measuring mechanism at the drive slide moves, the maximum limit position and the minimum limit position prevent the width measuring mechanism from going out of the screw limit.

[0047] When the width measuring mechanism stops, the drive mechanism provides a stopping position to the width measuring mechanism using the original limit component;

[0048] When the width measuring mechanism needs to be recalibrated to correct the error, the drive mechanism provides a calibration reference to the width measuring mechanism with a reference limit component.

[0049] An online compensation method for aluminum coil width is disclosed. During the aluminum coil production process, the method uses an online aluminum coil width detection method to inspect the strip material used in the production process. After the production of an aluminum coil is completed, a data list is generated based on that aluminum coil. The data list includes the coil number, alloy number, processing parameters, set width, actual width, and width deviation value ΔL, as well as the average value Aver(ΔL) and standard deviation Stedev(ΔL) of the width deviation value, expressed by the formula:

[0050]

[0051] Symbol explanation:

[0052] Ste dev(ΔL): Standard deviation;

[0053] N: The total number of data;

[0054] ΔL i : The i-th data point;

[0055] Aver(ΔL): Average value.

[0056] Example 2:

[0057] In this example, the strip width detection mechanism uses a centrally symmetrical movement of horizontal slide rails. After the strip head passes under the strip width detection frame, the slide rails automatically move to both sides of the strip's edge according to the incoming material width, establishing basic positioning. (The production line first transmits the strip width data signal to the strip width detection system. The strip width detection system uses a servo motor to drive a lead screw, moving two pairs of laser sensors for strip width detection to both sides of the strip. The encoder inside the servo motor calculates the lead screw's stroke, i.e., the theoretical width Lset of the strip.) Then, a set of high-precision laser detection sensors is installed on each side of the strip's edge. These laser-type CCD length sensors achieve micron-level accuracy over long distances and are non-contact. The laser sensors measure using a linear CCD scan, and the measurement is synchronized with the object's movement speed.

[0058] Each side of the strip has a pair of laser sensors. By detecting the change in bandwidth at the edges, the deviation in strip width is detected in real time online. The final strip width, Lact, is obtained by adding the deviation ΔL / 2 to the theoretical bandwidth Lset. Lact = Lset + 2(ΔL / 2). The maximum and minimum limit positions are used to protect the width measuring mechanism from exceeding the lead screw limit. The initial limit position is used to stop the width measuring mechanism and open it to the docking position. The reference limit position is used for calibration of the width measuring mechanism.

[0059] This measures the width deviation of the strip. Looking at the cross-section of the strip's edge, it's divided into left and right sides. The left laser sensor measures ΔL / 2, with negative values ​​to the right from 0 and positive values ​​to the left, with a maximum measurement range of 14mm. The right laser sensor measures ΔL / 2, with negative values ​​to the left from 0 and positive values ​​to the right, also with a maximum measurement range of 14mm. (See below.) Figure 2 As shown.

[0060] To ensure that the strip width detection data is not affected by poor strip shape fluctuations at the strip edge, the online strip width detection system has been specially selected for its installation position. It is located at the positive exit position of a pair of tension rollers, where the strip and rollers form a wrap angle greater than 180 degrees, ensuring sufficient strip extension and guaranteeing detection accuracy.

[0061] In the measuring device described in this example, the mechanism consists of a Siemens servo motor that drives a laser sensor to detect an object via a lead screw. The servo motor moves left and right to move the laser sensor to a pre-set position. There are two pairs of laser sensors. The actual width of the tested material is sent to an external industrial host computer for monitoring through internal calculations, and the data is stored in the host computer.

[0062] The strip width measurement mechanism utilizes a high-speed laser CCD width sensor with a high-precision sampling cycle of 2000 times per second. When ready for use, a servo motor and encoder actuator move the laser width sensor to the set bandwidth position, with the edge line of the strip positioned in the middle of the laser width sensor. The mechanism locks the initial value. During production, the laser width sensor measures edge changes and displays the data on a trend chart and stores it in a data table.

[0063] The data statistics in this example are real-time plate width statistics, specifically: the data statistics include the alloy number of the aluminum coil, the coil width and thickness, the process parameters of stretching and straightening during the production process, the real-time plate width values ​​measured during the production process are uniformly classified, and the standard deviation is used to find the deformation of coils of various alloys and different process specifications.

[0064] After a roll is produced, the sheet width measurement system will generate a data list containing the roll number, alloy number, processing parameters, set sheet width, actual sheet width, and sheet width deviation value ΔL, as well as the average value Aver(ΔL) and standard deviation Ste dev(ΔL) of the sheet width deviation value.

Claims

1. An apparatus for on-line measurement of the width of an aluminum web, characterized by: The device includes a strip width detection frame located at the strip transport path. The strip width detection frame includes a horizontally arranged slide rail. Two laser sensors supported by a slide block are arranged in pairs at the slide rail. The slide block is connected to a drive mechanism. When the strip head of the aluminum coil reaches the strip width detection frame, the drive mechanism drives the slide block to move, moving the two laser sensors to the two sides of the strip respectively, and scanning the edges of the strip.

2. The aluminum coil sheet width on-line detection device according to claim 1, characterized in that: A pair of tension rollers are provided in the input direction of the strip width detection frame. When the strip passes through the tension rollers, the strip and the rollers form a wrap angle of more than 180 degrees so that the strip forms the extension required for detection to ensure detection accuracy.

3. The aluminum coil sheet width on-line detection device according to claim 1, characterized in that: The drive mechanism includes a servo motor, which is connected to the slide block via a lead screw to drive the slide block to slide along the slide rail. The detection device is connected to the encoder inside the servo motor.

4. The aluminum coil sheet width on-line detection device according to claim 3, characterized in that: The laser sensor includes a vertically arranged transmitter and receiver. When the two laser sensors move to the two sides of the strip, a detection position is formed between the transmitter and receiver to allow the edge of the strip to pass through. When the strip passes through the detection position, the strip is located in the middle area between the transmitter and receiver.

5. The aluminum coil sheet width on-line detection device according to claim 4, characterized in that: The transmitting end is equipped with a laser strip composed of laser point sources. The laser strip emits a highly collimated parallel beam towards the receiving end to ensure the stability of the laser optical path through the coherence of the laser and reduce ambient light interference.

6. The aluminum coil sheet width on-line detection device according to claim 4, characterized in that: The receiver head includes a linear CCD. When the laser emitted by the transmitter is blocked by the strip and forms a clearly defined shadow area at the linear CCD, the width of the shadow area corresponds to the number of pixels of the linear CCD.

7. The online aluminum coil width detection device according to claim 4, characterized in that: The maximum measurement range of both the left and right laser sensors is 14mm.

8. The online aluminum coil width detection device according to claim 4, characterized in that: The drive mechanism is equipped with a maximum limit position, a minimum limit position, a reference limit position, and an original limit position. When the width measuring mechanism at the drive slide moves, the maximum limit position and the minimum limit position prevent the width measuring mechanism from going out of the lead screw limit.

9. The aluminum coil sheet width on-line detection device according to claim 8, characterized in that: When the width measuring mechanism stops, the drive mechanism provides a stopping position to the width measuring mechanism using the original limit component.

10. The aluminum coil sheet width on-line detection device according to claim 8, characterized in that: When the width measuring mechanism needs to be recalibrated to correct the error, the drive mechanism provides a calibration reference to the width measuring mechanism with a reference limit component.

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