Slab centering control method and slab centering rolling device

Abstract

The embodiment of the present application provides a slab centering control method and slab centering rolling device, and relates to the technical field of slab rolling. The slab centering control method comprises the following steps: acquiring the inclination angle of the slab and the distance between the end point of the slab and the laser beam through a camera device; judging whether the inclination angle of the slab is greater than a preset offset angle; if the inclination angle of the slab is greater than the preset offset angle, judging that the slab is in a non-centering state, issuing an alarm signal and controlling the roller way to reduce the speed; if the inclination angle of the slab is less than or equal to the preset offset angle, judging whether the distance between the end point of the slab and the laser beam is greater than a preset offset distance; if the distance between the end point of the slab and the laser beam is greater than the preset offset distance, judging that the slab is in a non-centering state, issuing an alarm signal and controlling the roller way to reduce the speed; if the distance between the end point of the slab and the laser beam is less than or equal to the preset offset distance, judging that the slab is in a centering state, and continuing to control the rolling mill to roll.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of slab rolling technology, in particular to a slab centering control method and a slab centering rolling device. BACKGROUND

[0002] In the process of plate rolling in a special rolling mill, the billet needs to be rolled through multiple passes to be rolled into the required finished product. In the rolling process, the slab needs to be centered on the rolling mill to ensure that it does not have defects such as camber and inclined angle rolling.

[0003] The current slab rolling process can only be centered by pushing the bed, which takes too long. If it is used multiple times during the rolling process, it will affect the rolling rhythm. Therefore, the operator usually only centers the billet by pushing the bed when the incoming material and the naked eye clearly indicate that the billet is offset, which results in poor accuracy of slab centering. SUMMARY

[0004] The purpose of the present application includes, for example, providing a slab centering control method that can improve the accuracy of slab centering.

[0005] The purpose of the present application also includes providing a slab centering rolling device that can improve the accuracy of slab centering.

[0006] Embodiments of the present application can be implemented as follows:

[0007] The embodiment of the present application provides a slab centering control method applied to a slab centering rolling device, the slab centering rolling device comprising a rack, a rolling mill, a roller bed, a camera device and at least one pair of laser emitters, the roller bed and the rolling mill being arranged in sequence, the rack being arranged on the rolling mill; the camera device is arranged on the rack and used for taking pictures of the slab on the roller bed; the pair of laser emitters are symmetrically arranged on the rack and used for emitting two parallel laser beams along the conveying direction of the roller bed, the distance between the two parallel laser beams being a theoretical spread width.

[0008] The control method comprises:

[0009] The camera device is used to obtain the inclination angle of the slab and the distance between the end point of the slab and the laser beam;

[0010] It is judged whether the inclination angle of the slab is greater than a preset offset angle;

[0011] If the inclination angle of the slab is greater than the preset offset angle, it is judged that the slab is in a non-centered state, an alarm signal is sent and the roller bed is controlled to slow down;

[0012] if the inclination angle of the slab is less than or equal to a preset offset angle, then determining whether the distance between the end point of the slab and the laser beam is greater than a preset offset distance;

[0013] if the distance between the end point of the slab and the laser beam is greater than the preset offset distance, then determining that the slab is in a misalignment state, issuing an alarm signal and controlling the roller to slow down;

[0014] if the distance between the end point of the slab and the laser beam is less than or equal to the preset offset distance, then determining that the slab is in an alignment state, and continuing to control the rolling mill to roll.

[0015] Optionally, the inclination angle of the slab is an included angle between a wide side of the slab close to the laser beam and the laser beam.

[0016] The distance between the end point of the slab and the laser beam includes a first offset distance, a second offset distance, a third offset distance and a fourth offset distance; wherein the first offset distance, the second offset distance, the third offset distance and the fourth offset distance are the closest distances between the four end points of the slab and the laser beam, respectively.

[0017] Optionally, the step of determining that the slab is in an alignment state, and continuing to control the rolling mill to roll, if the distance between the end point of the slab and the laser beam is less than or equal to the preset offset distance, includes:

[0018] if the first offset distance, the second offset distance, the third offset distance and the fourth offset distance are all less than or equal to the preset offset distance and are all greater than or equal to 0, then determining that the slab is in an alignment state, and continuing to control the rolling mill to roll.

[0019] Optionally, the step of determining whether the distance between the end point of the slab and the laser beam is greater than a preset offset distance, if the inclination angle of the slab is less than or equal to a preset offset angle, includes:

[0020] if any one of the first offset distance, the second offset distance, the third offset distance and the fourth offset distance is less than 0, then determining that the slab is in a misalignment state, issuing an alarm signal and controlling the roller to slow down.

[0021] Optionally, the slab alignment rolling device further includes a pusher, and the control method further includes: if it is determined that the slab is in a misalignment state, then controlling the pusher to push the slab to align the slab.

[0022] Embodiments of the present application also provide a slab alignment rolling device for implementing the above-described slab alignment control method.

[0023] The slab centering rolling device comprises a rack, a rolling mill, a roller way, a push bed, a camera device and at least one pair of laser emitters, the roller way and the rolling mill are sequentially arranged, the rack is arranged on the rolling mill, the camera device is arranged on the rack and used for taking a photo of the slab on the roller way, the pair of laser emitters are symmetrically arranged on the rack and used for emitting two parallel laser beams along the conveying direction of the roller way, the distance between the two parallel laser beams is a theoretical spread, and the push bed is arranged on one side of the roller way.

[0024] Optionally, the roller way comprises a first roller way and a second roller way, the first roller way, the rolling mill and the second roller way are sequentially arranged, and the number of the camera devices is two, and the two camera devices are respectively directed to the first roller way and the second roller way.

[0025] Optionally, the two camera devices are respectively directed to the middle part of the first roller way and the second roller way.

[0026] Optionally, the laser emitters comprise two pairs, one pair of the laser emitters emits two parallel laser beams towards the first roller way, and the other pair of the laser emitters emits two parallel laser beams towards the second roller way, and the distance between the two parallel laser beams emitted by one pair of the laser emitters is smaller than the distance between the two parallel laser beams emitted by the other pair of the laser emitters.

[0027] Optionally, the rack is provided with a slide rail and a driving mechanism, the length direction of the slide rail is perpendicular to the conveying direction of the slab, the two pairs of laser emitters are in sliding cooperation with the slide rail, and the driving mechanism is used for driving the laser emitters to slide along the slide rail.

[0028] The slab centering control method and the slab centering rolling device have the following advantages: in the process of rolling the slab, the slab is conveyed on the roller way, the camera device obtains the inclination angle of the slab and the distance between the end point of the slab and the laser beam, first, it is judged whether the inclination angle of the slab is greater than a preset offset angle, if the inclination angle of the slab is greater than the preset offset angle, it is judged that the slab is in a non-centering state, an alarm signal is sent out and the roller way is controlled to slow down, if the inclination angle of the slab is less than or equal to the preset offset angle, it is further judged whether the distance between the end point of the slab and the laser beam is greater than a preset offset distance, if the distance between the end point of the slab and the laser beam is greater than the preset offset distance, it is judged that the slab is in a non-centering state, an alarm signal is sent out and the roller way is controlled to slow down, if the distance between the end point of the slab and the laser beam is less than or equal to the preset offset distance, it is judged that the slab is in a centering state, and the rolling mill is continuously controlled to roll. In this process, manual judgment is not needed, and the accuracy of slab centering is improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0030] Figure 1 It is a top view of the slab centering rolling device in the embodiment of the present application.

[0031] Figure 2 It is a front view of the slab centering rolling device in the embodiment of the present application.

[0032] Figure 3 It is a schematic diagram for showing the positional relationship between the slab and the laser beam in the embodiment of the present application.

[0033] Figure 4 It is a flow chart of steps S100-S600 in the slab centering control method in the embodiment of the present application.

[0034] Figure 5 It is a flow chart of step S700 in the slab centering control method in the embodiment of the present application.

[0035] Figure legend: 100 - rack; 200 - rolling mill; 300 - roller table; 310 - first roller table; 320 - second roller table; 400 - pusher; 500 - camera device; 600 - laser emitter; 700 - slab. DETAILED DESCRIPTION

[0036] In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art on the basis of the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0038] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0039] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0040] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0041] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0042] The present application found that the current slab rolling process can only be centered by the pusher, which takes too long, and if used multiple times during rolling, it will affect the rolling rhythm, so the operator usually only when the incoming material and the naked eye can obviously judge the offset of the blank, the pusher is used to roll the blank to the center, which leads to poor accuracy of the slab centering. The embodiments of the present application provide a slab centering rolling device and a slab centering control method, at least for solving the technical problem.

[0043] Please refer to Figures 1-3 The slab centering rolling device provided by the embodiments of the present application is used to realize the slab centering control method; the slab centering rolling device comprises a rack 100, a rolling mill 200, a roller bed 300, a pusher 400, a camera device 500 and at least one pair of laser emitters 600, the roller bed 300 and the rolling mill 200 are arranged in sequence, and the rack 100 is arranged on the rolling mill 200; the camera device 500 is arranged on the rack 100 and is used to take pictures of the slab 700 on the roller bed 300; a pair of laser emitters 600 are symmetrically arranged on the rack 100 and are used to emit two parallel laser beams along the conveying direction of the roller bed 300, the distance between the two parallel laser beams is the theoretical spread D; the pusher 400 is arranged on one side of the roller bed 300.

[0044] It should be noted that the camera device 500 is a camera for capturing the position of the slab 700 in real time; the slab centering rolling device further comprises a controller, the rolling mill 200, the roller bed 300, the pusher 400, the camera device 500 and the laser emitter 600 are electrically connected with the controller, the controller can control the rolling mill 200 to roll or stop rolling, control the roller bed 300 to speed up or slow down, control the pusher 400 to push the slab 700 to center the slab 700, and obtain the inclination angle a of the slab 700 and the distance between the end point of the slab 700 and the laser beam through the camera device 500.

[0045] In the embodiment, the roller table 300 comprises a first roller table 310 and a second roller table 320, the first roller table 310, the rolling mill 200 and the second roller table 320 are arranged in sequence; the number of the camera 500 is two, and the two cameras 500 are respectively directed to the first roller table 310 and the second roller table 320.

[0046] It should be noted that the transportation direction of the slab 700 is from the first roller table 310 to the second roller table 320 after rolling by the rolling mill 200, therefore, the theoretical spread width D of the slab 700 on the first roller table 310 is smaller than the theoretical spread width D of the slab 700 on the second roller table 320; the two cameras respectively capture the position of the slab 700 on the first roller table 310 and the second roller table 320 in real time.

[0047] In the embodiment, the two cameras 500 are respectively directed to the middle part of the first roller table 310 and the second roller table 320.

[0048] By setting the camera 500 to the middle part of the first roller table 310 and the second roller table 320, the image of the slab 700 captured by the camera 500 is more reliable, so as to avoid error caused by the deviation of the position of the camera 500.

[0049] In the embodiment, the laser emitter 600 comprises two pairs, one pair of the laser emitter 600 emits two parallel laser beams towards the first roller table 310, and the other pair of the laser emitter 600 emits two parallel laser beams towards the second roller table 320; the distance between the two parallel laser beams emitted by one pair of the laser emitter 600 is smaller than the distance between the two parallel laser beams emitted by the other pair of the laser emitter 600.

[0050] It should be noted that the distance between the two parallel laser beams emitted towards the first roller table 310 is the first theoretical spread width, and the area between the two parallel laser beams is the first theoretical spread width area; the distance between the two parallel laser beams emitted towards the second roller table 320 is the second theoretical spread width, and the area between the two parallel laser beams is the second theoretical spread width area; the first theoretical spread width is smaller than the second theoretical spread width, and the first theoretical spread width and the second theoretical spread width are both preset values artificially set in the program.

[0051] In the embodiment, the rack 100 is provided with a slide rail and a driving mechanism (not shown in the figure), the length direction of the slide rail is perpendicular to the transportation direction of the slab 700, and the two pairs of the laser emitter 600 are in sliding cooperation with the slide rail, and the driving mechanism is used to drive the laser emitter 600 to slide along the slide rail.

[0052] It should be noted that the driving mechanism can be an electric cylinder or the like capable of driving the laser emitter 600 to slide on the slide rail, each pair of laser emitters 600 can be close to or away from each other, and each pair of laser emitters 600 is symmetrically arranged relative to the camera.

[0053] Before transporting the slab 700 on the first roller 310, the controller first adjusts the positions of the two pairs of laser emitters 600 according to the input first theoretical spread width and second theoretical spread width, so that the distance between the two parallel laser beams emitted towards the first roller 310 is the first theoretical spread width, and the distance between the two parallel laser beams emitted towards the second roller 320 is the second theoretical spread width.

[0054] Please refer to Figure 4 , Figure 5 The slab centering control method provided by the embodiments of the present application is applied to the slab centering rolling device described above.

[0055] The control method comprises:

[0056] Step S100, acquiring the inclination angle a of the slab 700 and the distance between the end point of the slab 700 and the laser beam by the camera device 500.

[0057] In this step, the controller acquires the inclination angle of the slab 700 on the first roller 310 and the distance between the end point of the slab 700 and the laser beam towards the first roller 310 by one of the cameras, and acquires the inclination angle of the slab 700 on the second roller 320 and the distance between the end point of the slab 700 and the laser beam towards the second roller 320 by the other camera.

[0058] Step S200, judging whether the inclination angle a of the slab 700 is greater than a preset offset angle.

[0059] After acquiring the inclination angle a of the slab 700 and the distance between the end point of the slab 700 and the laser beam, it is first judged whether the inclination angle a of the slab 700 is greater than a preset offset angle.

[0060] Step S300, if the inclination angle a of the slab 700 is greater than the preset offset angle, it is judged that the slab 700 is in a misalignment state, an alarm signal is issued and the roller 300 is controlled to slow down.

[0061] It should be noted that the inclination angle a of the slab 700 is the included angle between the wide side of the slab 700 close to the laser beam and the laser beam; and the preset offset angle is a program setting value.

[0062] If the inclination angle a of the slab 700 is greater than the preset offset angle, the controller judges that the slab 700 is in a misalignment state, an alarm signal is issued and the roller 300 is controlled to slow down.

[0063] Step S400, if the inclination angle a of the slab 700 is less than or equal to the preset offset angle, it is determined whether the distance between the end point of the slab 700 and the laser beam is greater than the preset offset distance.

[0064] The controller further determines whether the distance between the end point of the slab 700 and the laser beam is greater than the preset offset distance, under the condition that the inclination angle a of the slab 700 is less than or equal to the preset offset angle.

[0065] Further, step S400 includes:

[0066] Sub-step S410, if any one of the first offset distance x1, the second offset distance x2, the third offset distance x3 and the fourth offset distance x4 is less than 0, it is determined that the slab 700 is in a misalignment state, an alarm signal is sent out and the roller table 300 is controlled to slow down.

[0067] It should be noted that if any end point of the slab 700 is out of the first theoretical width expansion area or the second theoretical width expansion area, the offset distance corresponding to the end point is set to be less than 0 at this time, for example, if the first end point of the slab 700 is out of the first theoretical width expansion area or the second theoretical width expansion area, the first offset distance is less than 0; wherein the first end point, the second end point, the third end point and the fourth end point of the slab 700 correspond to the first offset distance x1, the second offset distance x2, the third offset distance x3 and the fourth offset distance x4 respectively.

[0068] Step S500, if the distance between the end point of the slab 700 and the laser beam is greater than the preset offset distance, it is determined that the slab 700 is in a misalignment state, an alarm signal is sent out and the roller table 300 is controlled to slow down.

[0069] It should be noted that the distance between the end point of the slab 700 and the laser beam includes the first offset distance x1, the second offset distance x2, the third offset distance x3 and the fourth offset distance x4; wherein the first offset distance x1, the second offset distance x2, the third offset distance x3 and the fourth offset distance x4 are the closest distances between the four end points of the slab 700 and the laser beam respectively.

[0070] If any one of the first offset distance x1, the second offset distance x2, the third offset distance x3 and the fourth offset distance x4 is greater than the preset offset distance d, the controller determines that the slab 700 is in a misalignment state, an alarm signal is sent out and the roller table 300 is controlled to slow down.

[0071] Step S600, if the distance between the end point of the slab 700 and the laser beam is less than or equal to the preset offset distance d, it is determined that the slab 700 is in a centering state, and the rolling mill 200 continues to be controlled to roll.

[0072] If each of the first offset distance x1, the second offset distance x2, the third offset distance x3 and the fourth offset distance x4 is less than or equal to the preset offset distance d, the controller determines that the slab 700 is in the centered state, and continues to control the rolling mill 200 to roll.

[0073] Further, the step S600 comprises:

[0074] The sub-step S610 comprises: if each of the first offset distance x1, the second offset distance x2, the third offset distance x3 and the fourth offset distance x4 is less than or equal to the preset offset distance d and greater than or equal to 0, determining that the slab 700 is in the centered state, and continuing to control the rolling mill 200 to roll.

[0075] It should be noted that if the slab 700 is in the first theoretical spreading region or the second theoretical spreading region, at this time, the first offset distance x1, the second offset distance x2, the third offset distance x3 and the fourth offset distance x4 are all greater than or equal to 0.

[0076] The control method further comprises:

[0077] The step S700 comprises: if it is determined that the slab 700 is in the un-centered state, controlling the pusher 400 to push the slab 700 so that the slab 700 is centered.

[0078] It should be noted that there is a pusher 400 on each side of the slab 700, and when the slab 700 is in the un-centered state, the corresponding pusher 400 is controlled by the controller to push the slab 700 until the slab 700 is in the centered state.

[0079] In summary, the embodiment of the present application provides a slab centering control method and a slab centering rolling device. In the process of rolling the slab 700, the slab 700 is transported on the first roller 310 and the second roller 320, the camera obtains the inclination angle of the slab 700 and the distance between the end point of the slab 700 and the laser beam, first determines whether the inclination angle of the slab 700 is greater than a preset offset angle, if the inclination angle of the slab 700 is greater than the preset offset angle, it is determined that the slab 700 is in the un-centered state, an alarm signal is sent and the roller 300 is controlled to slow down, if the inclination angle of the slab 700 is less than or equal to the preset offset angle, it is further determined whether the distance between the end point of the slab 700 and the laser beam is greater than a preset offset distance, if the distance between the end point of the slab 700 and the laser beam is greater than the preset offset distance, it is determined that the slab 700 is in the un-centered state, an alarm signal is sent and the roller 300 is controlled to slow down, and if the distance between the end point of the slab 700 and the laser beam is less than or equal to the preset offset distance, it is determined that the slab 700 is in the centered state, and the rolling mill 200 is continued to be controlled to roll. In this process, manual judgment is not required, and the accuracy of the slab 700 centering is improved.

[0080] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A slab centering control method characterized by, The application is applied to a slab centering rolling device, which comprises a rack, a rolling mill, a roller table, a camera device and at least one pair of laser emitters, the roller table and the rolling mill are sequentially arranged, the rack is arranged on the rolling mill, the camera device is arranged on the rack and used for taking a photo of the slab on the roller table, and the pair of laser emitters are symmetrically arranged on the rack and used for emitting two parallel laser beams along the conveying direction of the roller table, the distance between the two parallel laser beams is a theoretical spread. The control method comprises: obtaining the inclination angle of the slab and the distance between the end point of the slab and the laser beam through the camera device; judging whether the inclination angle of the slab is greater than a preset offset angle; if the inclination angle of the slab is greater than the preset offset angle, judging that the slab is in a non-centering state, issuing an alarm signal and controlling the roller table to slow down; if the inclination angle of the slab is less than or equal to the preset offset angle, further judging whether the distance between the end point of the slab and the laser beam is greater than a preset offset distance; if the distance between the end point of the slab and the laser beam is greater than the preset offset distance, judging that the slab is in a non-centering state, issuing an alarm signal and controlling the roller table to slow down; if the distance between the end point of the slab and the laser beam is less than or equal to the preset offset distance, judging that the slab is in a centering state and continuing to control the rolling mill to roll; the slab centering rolling device further comprises a pusher, and the control method further comprises: if it is judged that the slab is in a non-centering state, controlling the pusher to push the slab to center the slab; the inclination angle of the slab is the included angle between the wide side of the slab close to the laser beam and the laser beam; the distance between the end point of the slab and the laser beam comprises a first offset distance, a second offset distance, a third offset distance and a fourth offset distance; wherein the first offset distance, the second offset distance, the third offset distance and the fourth offset distance are the distances between the four end points of the slab and the laser beam closest to each other.

2. The slab centering control method according to claim 1, characterized by, the step of judging that the slab is in a centering state and continuing to control the rolling mill to roll if the distance between the end point of the slab and the laser beam is less than or equal to the preset offset distance comprises: if the first offset distance, the second offset distance, the third offset distance and the fourth offset distance are all less than or equal to the preset offset distance and all greater than or equal to 0, judging that the slab is in a centering state and continuing to control the rolling mill to roll.

3. The slab centering control method according to claim 1, characterized by, the step of further judging whether the distance between the end point of the slab and the laser beam is greater than the preset offset distance if the inclination angle of the slab is less than or equal to the preset offset angle comprises: if any one of the first offset distance, the second offset distance, the third offset distance and the fourth offset distance is less than 0, judging that the slab is in a non-centering state, issuing an alarm signal and controlling the roller table to slow down.

4. The slab centering control method according to claim 1, characterized by, the roller table comprises a first roller table and a second roller table, the first roller table, the rolling mill and the second roller table are sequentially arranged; the number of the camera devices is two, and the two camera devices are respectively directed to the first roller table and the second roller table.

5. The slab centering control method according to claim 4, characterized by, Two said cameras are respectively directed to the middle part of the first roller and the second roller.

6. The slab centering control method according to claim 4, characterized by, The laser emitter comprises two pairs, one pair of which emits two parallel laser beams towards the first roller, and the other pair of which emits two parallel laser beams towards the second roller; wherein the distance between the two parallel laser beams emitted by one pair of the laser emitter is less than the distance between the two parallel laser beams emitted by the other pair of the laser emitter.

7. The slab centering control method according to claim 6, characterized by, The rack is provided with a slide rail and a driving mechanism, the length direction of the slide rail is perpendicular to the conveying direction of the slab, both pairs of the laser emitter are in sliding fit with the slide rail, and the driving mechanism is used to drive the laser emitter to slide along the slide rail.

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