A detection device and detection method for hot-rolled wheel steel coil

Abstract

The present invention relates to the field of hot-rolled coil detection technology, and in particular to a detection device and method for hot-rolled coil of wheel steel, comprising a support frame, a guide wheel is installed on the side of the support frame, a pressing assembly fixedly connected to the support frame is provided on the side of the guide wheel, a transmitter fixedly connected to the support frame is provided above the pressing assembly, and a receiver fixedly connected to the support frame is provided on one side of the blocking plate; the present invention irradiates the surface of the coil by the arranged transmitter, and when the surface of the coil is smooth, its light is reflected normally, and once a defect occurs on the surface of the coil, the light is irradiated on the defective area, and the light is reflected to the inside of the receiver under the action of the defective area, and an alarm lights up at this time to remind the staff that there is a defect in this area. This detection method does not require manual hand-held irradiation on the hot-rolled coil and then careful identification, which greatly reduces the staff's eye fatigue intensity and can perform continuous detection.

Description

Technical Field

[0001] The invention relates to the technical field of hot-rolled coil detection, and in particular to a detection device and a detection method for a hot-rolled coil of wheel steel. Background Art

[0002] Hot coil is hot-rolled coil, which is made of slab as raw material, and is made into strip steel by roughing mill and finishing mill after heating. The hot steel strip coming out of the last rolling mill of finishing rolling is cooled to the set temperature by laminar flow, and is rolled into steel strip coil by coiler. The cooled steel strip coil, according to the different needs of users, goes through different finishing lines, flattening, straightening, cross-cutting or longitudinal cutting, inspection, weighing, packaging and marking, etc., and is processed into steel plates, flat coils and longitudinally cut steel strip products.

[0003] At present, after the hot-rolled coil is processed, its surface needs to be inspected. The general inspection method is that the staff holds a strong flashlight to illuminate the surface of the hot-rolled coil, and then checks the surface quality of the hot-rolled coil with the naked eye to find out the defective products in time. However, it is very easy to cause eye fatigue when manually observing the hot-rolled coil with a strong flashlight for a long time, and the inspection quality cannot be guaranteed. Therefore, in view of the above problems, a detection device and a detection method for wheel steel hot-rolled coil are proposed. Summary of the invention

[0004] The object of the present invention is to provide a detection device and a detection method for hot-rolled coil of wheel steel to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] As an optional solution of the detection device and detection method of the hot-rolled coil of wheel steel described in the present invention, wherein: a detection device and detection method of the hot-rolled coil of wheel steel, comprising a base and a support frame, the upper part of the base is fixedly connected with a support assembly and a support frame distributed on the left and right, a guide wheel is installed on the side of the support frame, a downward pressing assembly fixedly connected to the support frame is provided on the side of the guide wheel, and a transmitter fixedly connected to the support frame is provided above the downward pressing assembly;

[0007] An alarm is fixedly connected to the top of the support frame, a blocking plate is fixedly connected to one side of the top of the support frame, and a receiver fixedly connected to the support frame is provided on one side of the blocking plate;

[0008] A rolling plate is provided inside the support assembly, and a cleaning assembly is provided on one side of the support assembly;

[0009] A rolling plate is arranged on the outer side of the guide wheel.

[0010] The detection method steps are as follows:

[0011] Step 1: First, place the rolled plate between the supporting components, and the other end of the rolled plate is attached to the outside of the guide wheel, and the outside of the rolled plate is attached to the pressing component;

[0012] Step 2: When the plate is rolled, the surface of the cleaning component is in contact with the surface of the plate, which is used to remove dust and impurities on the surface of the plate to ensure the quality of subsequent inspection of the plate;

[0013] Step 3: During the rolling process, the transmitter is started to emit light to illuminate the surface of the rolled plate. When the surface of the rolled plate is smooth, the reflected light source of the transmitter will not illuminate the surface of the receiver, and the quality of the rolled plate is qualified. When there is a dent on the surface of the rolled plate, part of the light source can be received by the receiver, and the alarm is activated at the same time, indicating that the quality of the rolled plate is lacking;

[0014] Step 4: Classify the rolled plates with qualified quality and the rolled plates with insufficient quality for the convenience of subsequent use.

[0015] At present, after the hot-rolled coil is processed, its surface needs to be inspected. The general inspection method is that the staff holds a strong flashlight to illuminate the surface of the hot-rolled coil, and then checks the surface quality of the hot-rolled coil with the naked eye to find out the defective products in time. However, it is very easy to cause eye fatigue when manually observing the hot-rolled coil with a strong flashlight for a long time, and the inspection quality cannot be guaranteed. When the device is used, the coil is placed between the supporting components, and one side of the coil is tightly fitted with the cleaning component, and the outer side of the cleaning component is connected to the base with a reinforcement plate, which is not shown in the figure, and one end of the coil is in close contact with the outer side of the guide wheel. One end of the coil cooperates with the pressing component, which is used to squeeze the coil to fix it. When the coil moves slowly on the outside of the guide wheel, the light emitter is started to irradiate the surface of the coil. When the surface of the coil is smooth, the light is reflected by the coil to the surface of the blocking plate to avoid light source pollution. When the light is irradiated on the recessed area of ​​the coil, part of the light is reflected to the receiver. At this time, the alarm is controlled to start under the action of the external controller to remind the staff. This detection method does not require manual hand-held irradiation on the hot-rolled coil and then carefully identify it, which greatly reduces the eye fatigue intensity of the staff, and can continue to detect and improve detection efficiency.

[0016] As an optional scheme of the detection device and detection method of a hot-rolled coil of wheel steel described in the present invention, the support assembly includes a support body, a first rotating shaft and a lower pressure wheel, the bottom of the support body is fixedly connected to the base, the top of the support body is fixedly connected to the first rotating shaft, and the outer side of the first rotating shaft is rotatably connected to the lower pressure wheel.

[0017] As an optional solution of the detection device and detection method of the hot-rolled coil of wheel steel described in the present invention, the side of the support body is fixedly connected with a support plate, the top of the support plate is fixedly connected with a second rotating shaft, and the outer side of the second rotating shaft is rotatably connected with an upper top wheel.

[0018] When the rolling plate is inserted under the lower pressure wheel and located above the upper top wheel, the rolling plate can be limited by the cooperation of the lower pressure wheel and the upper top wheel to ensure the normal movement of the rolling plate, and the first rotating shaft and the second rotating shaft can ensure the stable rotation of the lower pressure wheel and the upper top wheel.

[0019] As an optional scheme of the detection device and detection method of the hot-rolled coil of wheel steel described in the present invention, the cleaning assembly includes a first motor, a mounting plate and a rotating shaft, one side of the first motor is fixedly connected to the mounting plate, the free end of the first motor is fixedly connected to the rotating shaft, the outer side of the rotating shaft is fixedly connected to a rotating cylinder, and the outer side of the rotating cylinder is fixedly connected to a cleaning brush.

[0020] During the movement of the plate roll, in order to prevent impurities on the surface of the plate roll from affecting the subsequent inspection quality, the first motor is started to drive the rotating shaft to rotate, thereby rotating the cleaning brush on the outside of the rotating shaft. At this time, the surface of the plate roll can be cleaned to ensure the subsequent quality.

[0021] As an optional scheme of the detection device and detection method of the hot-rolled coil of wheel steel described in the present invention, wherein: a vacuum cleaner is fixedly connected to the outer side of the mounting plate, the input end of the vacuum cleaner is fixedly connected to a hollow tube, the outer side of the hollow tube is connected to evenly distributed inclined tubes, and the outer side of the hollow tube is fixedly connected to the mounting plate.

[0022] After the roll plate is cleaned, there will be impurities on the outside of the roll plate. At this time, by starting the vacuum cleaner, the impurities can be sucked into the vacuum cleaner for collection under the action of the hollow tube and the inclined tube, so as to avoid affecting the subsequent detection of the roll plate.

[0023] As an optional solution of the detection device and detection method of the wheel steel hot-rolled coil described in the present invention, wherein: the pressing assembly includes a fixed frame, a second motor and a threaded shaft, the outer side of the fixed frame is fixedly connected to the support frame, the interior of the fixed frame is fixedly connected to the second motor, the free end of the second motor is fixedly connected to the threaded shaft, the outer side of the threaded shaft is spirally connected to a threaded sleeve, the other end of the threaded sleeve is fixedly connected to a moving plate, and the outer side of the moving plate is slidably connected to the fixed frame;

[0024] The other end of the movable plate is fixedly connected to a connecting plate arranged front and back, the other end of the connecting plate is fixedly connected to a third rotating shaft, and the outer side of the third rotating shaft is fixedly connected to a limiting wheel.

[0025] When the rolling plate is located outside the guide wheel, the limiting wheel provided can squeeze the rolling plate so that it can stably contact with the guide wheel, and in actual use, the threaded shaft can be driven to rotate by starting the second motor, and the threaded shaft drives the outer threaded sleeve to move, and then drives the connecting plate to move under the action of the moving plate, so that the third rotating shaft on one side of the connecting plate drives the outer limiting wheel to move, thereby ensuring that one side of the rolling plates of different thicknesses is in close contact with the guide wheel, thereby ensuring its detection quality.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention irradiates the surface of the coil by the transmitter. When the surface of the coil is smooth, the light is reflected normally, and the reflected light is irradiated on the surface of the blocking plate to avoid light pollution. Once there is a defect on the surface of the coil, the light is irradiated on the defective area, and the light is reflected into the receiver under the action of the defective area. At this time, the alarm lights up to remind the staff that there is a defect in this area. This detection method does not require manual hand-held irradiation on the hot-rolled coil and then carefully distinguish, which greatly reduces the eye fatigue intensity of the staff, and can continuously perform detection;

[0028] When testing the rolled plate, the lower pressure wheel and upper top wheel can normally limit the rolled plate to ensure the normal movement of the rolled plate and the quality of subsequent testing;

[0029] When the rolled plate is attached to the surface of the guide wheel, in order to stably limit the rolled plate, the second motor drives the threaded shaft to rotate, and the threaded shaft drives the threaded sleeve to move, so that the movable plate slides inside the fixed frame. At this time, the connecting plate on one side can drive the third rotating shaft and the limiting wheel to move, so that the rolled plate can be tightly squeezed, ensuring that the rolled plate is stably in contact with the light emitted by the transmitter during stable movement, and ensuring that the rolled plate can be stably detected;

[0030] When the plate roll moves, the first motor is started in advance to drive the rotating shaft to rotate, and the rotating shaft drives the rotating cylinder and the cleaning brush to rotate. At this time, the surface of the plate roll can be cleaned to ensure accurate and stable detection of the plate roll;

[0031] When cleaning the surface of the rolled plate, the impurities falling from the surface of the rolled plate can be collected in time through the provided vacuum cleaner, hollow tube and inclined tube to avoid repeated contamination of the rolled plate and ensure the quality of subsequent rolled plate inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The overall structural diagram of a detection device and a detection method for hot-rolled coil of wheel steel is shown;

[0033] Figure 2 It is a schematic diagram of the supporting component structure of a detection device and detection method for hot-rolled coil of wheel steel;

[0034] Figure 3 It is a schematic diagram of the cleaning component structure of a detection device and a detection method for hot-rolled coil of wheel steel;

[0035] Figure 4 The present invention is a schematic diagram of the structure of a pressing component of a detection device and a detection method for hot-rolled coil of wheel steel.

[0036] In the figure: 1. base; 2. support frame; 3. guide wheel; 4. support assembly; 401. support body; 402. first rotating shaft; 403. lower pressure wheel; 404. support plate; 405. second rotating shaft; 406. upper top wheel; 5. cleaning assembly; 501. first motor; 502. mounting plate; 503. rotating shaft; 504. rotating cylinder; 505. cleaning brush; 506. vacuum cleaner; 507. hollow tube; 508. tilting tube; 6. pressing assembly; 601. fixing frame; 602. second motor; 603. threaded shaft; 604. threaded sleeve; 605. moving plate; 606. connecting plate; 607. third rotating shaft; 608. limiting wheel; 7. transmitter; 8. receiver; 9. blocking plate; 10. alarm; 11. rolling plate. DETAILED DESCRIPTION

[0037] Embodiment 1:

[0038] See also Figure 1 , the present invention provides a technical solution:

[0039] A detection device and detection method for hot-rolled coil of wheel steel, comprising a base 1 and a support frame 2, wherein the upper part of the base 1 is fixedly connected with a support assembly 4 and the support frame 2 which are distributed on the left and right, a guide wheel 3 is installed on the side of the support frame 2, a pressing assembly 6 which is fixedly connected to the support frame 2 is arranged on the side of the guide wheel 3, and a transmitter 7 which is fixedly connected to the support frame 2 is arranged above the pressing assembly 6;

[0040] An alarm 10 is fixedly connected to the top of the support frame 2, a blocking plate 9 is fixedly connected to one side of the top of the support frame 2, and a receiver 8 fixedly connected to the support frame 2 is provided on one side of the blocking plate 9;

[0041] A rolling plate 11 is provided inside the support assembly 4, and a cleaning assembly 5 is provided on one side of the support assembly 4;

[0042] A rolling plate 11 is provided on the outer side of the guide wheel 3 .

[0043] The detection method steps are as follows:

[0044] Step 1: First, place the roll plate 11 between the support components 4, and the other end of the roll plate 11 is attached to the outside of the guide wheel 3, and the outside of the roll plate 11 is attached to the pressing component 6;

[0045] Step 2: When the roll plate 11 moves, the surface of the cleaning component 5 is in contact with the surface of the roll plate 11 to remove dust and impurities on the surface of the roll plate 11 to ensure the quality of subsequent inspection of the roll plate 11;

[0046] Step 3: During the movement of the roll plate 11, the transmitter 7 is activated to emit a light source to illuminate the surface of the roll plate 11. When the surface of the roll plate 11 is smooth, the reflected light source of the transmitter 7 will not illuminate the surface of the receiver 8, and the quality of the roll plate 11 is qualified. When the surface of the roll plate 11 is concave, a part of the light source can be received by the receiver 8, and the alarm 10 is activated at the same time, and the quality of the roll plate 11 is defective.

[0047] Step 4: Classify the rolled plates 11 with qualified quality and the rolled plates 11 with insufficient quality respectively for the convenience of subsequent use.

[0048] At present, after the hot-rolled coil is processed, its surface needs to be inspected. The general inspection method is that the staff holds a strong flashlight to illuminate the surface of the hot-rolled coil, and then checks the surface quality of the hot-rolled coil with the naked eye to find out the defective products in time. However, it is very easy to cause eye fatigue when manually observing the hot-rolled coil with a strong flashlight for a long time, and the inspection quality cannot be guaranteed. When the device is used, the coil 11 is placed between the support components 4, and one side of the coil 11 is tightly fitted with the cleaning component 5, and the outer side of the cleaning component 5 is connected to the base 1 by a reinforcement plate, which is not shown in the figure, and one end of the coil 11 is in close contact with the outer side of the guide wheel 3, and at the same time, one end of the coil 11 Cooperating with the pressing component 6, the pressing component 6 is used to squeeze the coil 11 to fix the coil 11. When the coil 11 moves slowly outside the guide wheel 3, the light emitter 7 is started to irradiate the surface of the coil 11. When the surface of the coil 11 is smooth, the light is reflected by the coil 11 to the surface of the blocking plate 9 to avoid light source pollution. When the light is irradiated on the recessed area of ​​the coil 11, a part of the light is reflected to the receiver 8. At this time, the alarm 10 is controlled to start under the action of the external controller to remind the staff. This detection method does not require manual hand-held irradiation on the hot-rolled coil and then carefully identify it, which greatly reduces the eye fatigue intensity of the staff, and can continue to detect and improve the detection efficiency.

[0049] Example 2

[0050] This embodiment is an improvement made to the first embodiment. Figure 2Specifically, the support assembly 4 includes a support body 401, a first rotating shaft 402 and a lower pressure wheel 403. The bottom of the support body 401 is fixedly connected to the base 1, the top of the support body 401 is fixedly connected to the first rotating shaft 402, and the outer side of the first rotating shaft 402 is rotatably connected to the lower pressure wheel 403.

[0051] A support plate 404 is fixedly connected to the side of the support body 401 , a second rotating shaft 405 is fixedly connected to the top of the support plate 404 , and an upper top wheel 406 is rotatably connected to the outer side of the second rotating shaft 405 .

[0052] The rolling plate 11 is inserted under the lower pressure wheel 403, and the rolling plate 11 is located above the upper top wheel 406. At this time, the rolling plate 11 can be limited by the cooperation of the lower pressure wheel 403 and the upper top wheel 406 to ensure that the rolling plate 11 can move normally, and the first rotating shaft 402 and the second rotating shaft 405 can ensure the stable rotation of the lower pressure wheel 403 and the upper top wheel 406.

[0053] Example 3

[0054] This embodiment is an improvement made to Example 2. Figure 3 Specifically, the cleaning assembly 5 includes a first motor 501, a mounting plate 502 and a rotating shaft 503. One side of the first motor 501 is fixedly connected to the mounting plate 502, the free end of the first motor 501 is fixedly connected to the rotating shaft 503, the outer side of the rotating shaft 503 is fixedly connected to a rotating cylinder 504, and the outer side of the rotating cylinder 504 is fixedly connected to a cleaning brush 505.

[0055] During the movement of the roll 11, in order to prevent impurities on the surface of the roll 11 from affecting the subsequent inspection quality, the first motor 501 is started to drive the rotating shaft 503 to rotate, and then the cleaning brush 505 on the outside of the rotating shaft 503 rotates. At this time, the surface of the roll 11 can be cleaned to ensure the subsequent quality.

[0056] Example 4

[0057] This embodiment is an improvement made to the implementation example 3, please refer to Figure 3 Specifically, a vacuum cleaner 506 is fixedly connected to the outer side of the mounting plate 502, a hollow tube 507 is fixedly connected to the input end of the vacuum cleaner 506, the outer side of the hollow tube 507 is connected to evenly distributed inclined tubes 508, and the outer side of the hollow tube 507 is fixedly connected to the mounting plate 502.

[0058] After the rolling plate 11 is cleaned, there will be impurities on the outside of the rolling plate 11. At this time, by starting the vacuum cleaner 506, the impurities can be sucked into the vacuum cleaner 506 for collection under the action of the hollow tube 507 and the inclined tube 508, so as to avoid affecting the subsequent detection of the rolling plate 11.

[0059] Example 5

[0060] This embodiment is an improvement made to the implementation example 4, please refer to Figure 4 Specifically, the pressing assembly 6 includes a fixed frame 601, a second motor 602 and a threaded shaft 603. The outer side of the fixed frame 601 is fixedly connected to the support frame 2. The second motor 602 is fixedly connected to the interior of the fixed frame 601. The free end of the second motor 602 is fixedly connected to the threaded shaft 603. The outer side of the threaded shaft 603 is spirally connected to a threaded sleeve 604. The other end of the threaded sleeve 604 is fixedly connected to a moving plate 605. The outer side of the moving plate 605 is slidably connected to the fixed frame 601.

[0061] The other end of the movable plate 605 is fixedly connected to a connecting plate 606 arranged front to back, the other end of the connecting plate 606 is fixedly connected to a third rotating shaft 607 , and the outer side of the third rotating shaft 607 is fixedly connected to a limiting wheel 608 .

[0062] When the rolling plate 11 is located outside the guide wheel 3, the limiting wheel 608 can squeeze the rolling plate 11 so that the rolling plate 11 can be stably contacted with the guide wheel 3, and in actual use, the second motor 602 can be started to drive the threaded shaft 603 to rotate, and the threaded shaft 603 drives the outer threaded sleeve 604 to move, and then drives the connecting plate 606 to move under the action of the movable plate 605, so that the third rotating shaft 607 on one side of the connecting plate 606 drives the outer limiting wheel 608 to move, thereby ensuring that one side of the rolling plates 11 of different thicknesses is in close contact with the guide wheel 3, thereby ensuring its detection quality.

[0063] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above is only a preferred implementation of the present invention. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A detection device for hot-rolled coil of wheel steel, characterized in that: The invention comprises a base (1) and a support frame (2), wherein a support assembly (4) and a support frame (2) distributed on the left and right are fixedly connected above the base (1), a guide wheel (3) is installed on the side of the support frame (2), a downward pressing assembly (6) fixedly connected to the support frame (2) is provided on the side of the guide wheel (3), and a launcher (7) fixedly connected to the support frame (2) is provided above the downward pressing assembly (6); An alarm (10) is fixedly connected to the top of the support frame (2), a blocking plate (9) is fixedly connected to one side of the top of the support frame (2), and a receiver (8) fixedly connected to the support frame (2) is provided on one side of the blocking plate (9); A rolling plate (11) is provided inside the support assembly (4), and a cleaning assembly (5) is provided on one side of the support assembly (4); A rolling plate (11) is provided on the outer side of the guide wheel (3); The support assembly (4) comprises a support body (401), a first rotating shaft (402) and a lower pressing wheel (403); the bottom of the support body (401) is fixedly connected to the base (1); the top of the support body (401) is fixedly connected to the first rotating shaft (402), and the outer side of the first rotating shaft (402) is rotatably connected to the lower pressing wheel (403); the side of the support body (401) is fixedly connected to a support plate (404), the top of the support plate (404) is fixedly connected to the second rotating shaft (405), and the outer side of the second rotating shaft (405) is rotatably connected to the upper top wheel (406); the cleaning assembly (5) comprises a first motor (501), a mounting plate (502) and a rotating shaft (503); one side of the first motor (501) is fixedly connected to the mounting plate (502), the free end of the first motor (501) is fixedly connected to the rotating shaft (503), and the rotating shaft (503) is fixedly connected to the lower pressing wheel (403). ) is fixedly connected to the outside of the guide wheel (3), and a cleaning brush (505) is fixedly connected to the outside of the rotating cylinder (504); a vacuum cleaner (506) is fixedly connected to the outside of the mounting plate (502), and a hollow tube (507) is fixedly connected to the input end of the vacuum cleaner (506); the outside of the hollow tube (507) is connected to evenly distributed inclined tubes (508), and the outside of the hollow tube (507) is fixedly connected to the mounting plate (502); when the rolling plate (11) moves slowly on the outside of the guide wheel (3), the light emitter (7) is activated, and light is irradiated on the surface of the rolling plate (11). When the surface of the rolling plate (11) is smooth, the light is reflected by the rolling plate (11) to the surface of the blocking plate (9) to avoid light source pollution. When the light is irradiated on the recessed area of ​​the rolling plate (11), a part of the light is reflected to the receiver (8), and the alarm (10) is controlled to be activated under the action of the external controller.

2. The detection device for hot-rolled wheel steel coil according to claim 1, characterized in that: The pressing assembly (6) comprises a fixed frame (601), a second motor (602) and a threaded shaft (603); the outer side of the fixed frame (601) is fixedly connected to the support frame (2); the interior of the fixed frame (601) is fixedly connected to the second motor (602); the free end of the second motor (602) is fixedly connected to the threaded shaft (603); the outer side of the threaded shaft (603) is spirally connected to a threaded sleeve (604); the other end of the threaded sleeve (604) is fixedly connected to a moving plate (605); the outer side of the moving plate (605) is slidably connected to the fixed frame (601); The other end of the movable plate (605) is fixedly connected to a connecting plate (606) arranged in a front-to-rear manner, the other end of the connecting plate (606) is fixedly connected to a third rotating shaft (607), and the outer side of the third rotating shaft (607) is fixedly connected to a limiting wheel (608).

3. The detection method of the detection device for hot-rolled coil of wheel steel according to claim 1 or 2, characterized in that: The detection method steps are as follows: Step 1: firstly, the rolling plate (11) is placed between the supporting components (4), and the other end of the rolling plate (11) is attached to the outside of the guide wheel (3), and the outside of the rolling plate (11) is attached to the pressing component (6); Step 2: When the roll plate (11) moves, the surface of the cleaning component (5) is in contact with the surface of the roll plate (11) to remove dust and impurities on the surface of the roll plate (11) to ensure the quality of subsequent inspection of the roll plate (11); Step 3: During the movement of the roll plate (11), the transmitter (7) is activated to emit a light source to illuminate the surface of the roll plate (11). When the surface of the roll plate (11) is smooth, the reflected light source of the transmitter (7) will not illuminate the surface of the receiver (8), and the quality of the roll plate (11) is qualified. When a concave problem occurs on the surface of the roll plate (11), a part of the light source is received by the receiver (8), and the alarm (10) is activated at the same time, and the quality of the roll plate (11) is defective. Step 4: Classify the rolled plates (11) with qualified quality and the rolled plates (11) with insufficient quality respectively to facilitate subsequent use.

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