Automatic steel plate centering device and centering method

Abstract

The invention provides an automatic centering device and centering method for a steel plate, and relates to the technical field of metal processing, the device comprises a laser scribing device, a magnetic centering mechanism, a lifting carrier roller mechanism and hobbing shear equipment which are arranged in an inlet area of the hobbing shear equipment; the rolling shear equipment comprises two rolling shears which are oppositely arranged, and the central axis between the two rolling shears is the central line of the conveying roller way; the movable side and the fixed side are oppositely provided with a cross beam, the cross beam is parallel to the center line of the conveying roller way, a plurality of magnetic centering mechanisms, lifting carrier roller mechanisms and the conveying roller way are arranged on the cross beam, and the near end and the far end of the cross beam are each provided with a laser scribing device. And the magnetic centering mechanism, the lifting carrier roller mechanism and the conveying roller way are arranged below the steel plate. Automatic centering and efficient shearing of the edge of the steel plate are achieved, and the production efficiency of a wide and thick plate production line and the shearing quality of the steel plate are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal processing, and in particular to an automatic centering device and a centering method for a steel plate. Background Art

[0002] As an important process in the iron and steel metallurgical production line, steel plate centering is widely used in steel plate rolling, straightening and shearing equipment. As the core mechanism of the rolling shear equipment, steel plate centering is mainly used to center the steel plates arranged obliquely on the transport roller before shearing. According to the process requirements, the fixed side shear line of the rolling shear is used as the reference to complete the centering operation of the edges of the steel plates along the width direction (vertically arranged with the center line of the transport roller) and the alignment of the edges along the length direction (aligned with the shear blades on both sides of the rolling shear and arranged in parallel), which comprehensively improves the shearing quality and yield rate of the steel plates.

[0003] In the prior art, the steel plate centering methods of rolling shear equipment mainly adopt electric centering method, hydraulic centering method and magnetic centering method. The existing magnetic centering method is as follows: 1) The steel plate centering method using visual observation and manual adjustment: For the centering operation before steel plate shearing, a laser generator is set on the shear blades on both sides of the rolling shearing equipment. The laser generator emits a laser line, and the two laser lines are aligned with the shear blades on both sides respectively. The operator visually observes the alignment status of the laser line and the edge of the steel plate, and manually controls the electromagnetic head to adjust the steel plate centering operation. This manual operation method of adjusting the steel plate centering cannot quantify the offset, and largely relies on manual visual observation of the alignment status between the edge of the steel plate and the two laser lines. Due to the deviation of manual alignment operation and the high labor intensity under the continuous production rhythm, there are common problems such as low efficiency and poor accuracy of steel plate centering.

[0004] 2) Automatic steel plate centering method based on remote camera contour method: The magnetic centering of the steel plate is achieved through the remote camera video image captured in the central control room, and the steel plate contour is extracted from the video stream collected by the camera to automatically realize the steel plate centering operation. Under normal conditions, the efficiency and accuracy of steel plate centering are substantially improved compared with manual alignment operations. However, in the actual production and shearing process, the laser line is affected by technical failures such as video image network delay and its own brightness attenuation. There will also be current problems such as remote image blur and steel plate centering deviation, which will ultimately affect the continuous production stability and steel plate shearing quality. Summary of the invention

[0005] Based on the above technical problem that the existing magnetic centering method has centering deviation, a steel plate automatic centering device and centering method are provided to solve the technical problems existing in the prior art such as large manual control deviation, remote camera image failure, and poor steel plate centering effect.

[0006] The technical means adopted by the present invention are as follows: An automatic steel plate centering device, comprising a laser marking device, a magnetic centering mechanism, a lifting roller mechanism and a rolling shearing device, which are arranged in the inlet area of ​​the rolling shearing device; The rolling shearing device comprises two rolling shears arranged opposite to each other, the central axis between the two rolling shears is the center line of the conveying roller; one side of the center line of the conveying roller is the moving side, and the other side of the center line of the conveying roller is the fixed side; the entrance area of ​​the rolling shearing device is the side close to the rolling shears as the proximal end, and the entrance area of ​​the rolling shearing device is the side away from the rolling shears as the distal end; A crossbeam is arranged opposite to the movable side and the fixed side. The crossbeam is arranged parallel to the center line of the transport roller. Several magnetic centering mechanisms, lifting roller mechanisms and transport rollers are arranged on the crossbeam. A laser marking device is arranged at the near end and the far end of the crossbeam respectively. The magnetic centering mechanism, lifting roller mechanism and transport roller are arranged under the steel plate.

[0007] Furthermore, the laser marking device includes a motor, a reducer, a screw, a laser marking instrument on the mobile side and a laser marking instrument on the fixed side, which are connected in sequence from the mobile side to the fixed side. The laser marking instrument on the mobile side moves in a direction perpendicular to the center line of the transport roller. The screw is arranged perpendicular to the center line of the transport roller. The laser marking instrument on the fixed side and the laser marking instrument on the mobile side emit laser lines parallel to the center line of the transport roller. The laser line emitted by the fixed side laser marking instrument coincides with the shear line of the fixed side rolling shear, and the laser line emitted by the mobile side laser marking instrument coincides with the shear line of the mobile side rolling shear.

[0008] Furthermore, the distance between each transport roller and the adjacent transport roller is fixed, and a magnetic centering mechanism is arranged between every two transport rollers.

[0009] Furthermore, each magnetic centering mechanism includes a transverse hydraulic cylinder, a frame and a magnetic head. The transverse hydraulic cylinder is connected to the frame, the magnetic head is arranged on the frame, and the frame is arranged perpendicular to the center line of the transport roller.

[0010] The present invention also provides a steel plate automatic centering method, which is implemented based on any one of the above steel plate automatic centering devices and comprises the following steps: S1. The incoming steel plate runs on several transport rollers toward the rolling shearing equipment. After the incoming steel plate reaches the entrance area of ​​the rolling shearing equipment, the transport roller stops running. At this time, the lifting roller mechanism and the magnetic centering mechanism are separated from the steel plate; S2. Based on the determined finished steel plate width, use a laser marking device to calibrate the shear line positions on both sides of the rolling shearing equipment; S3, calculate the length of the incoming steel plate and determine the combination of magnetic centering mechanisms to be used, i.e., the proximal magnetic head and the distal magnetic head; S4, using the laser rangefinder on the magnetic centering mechanism to determine the centering distance between the near-end magnetic head and the far-end magnetic head; S5. Based on the width of the finished steel plate and the centering distances of the proximal magnetic head and the distal magnetic head, the centering distances of the proximal magnetic head and the distal magnetic head are obtained; S6, based on the centering distance between the near-end head and the far-end head, combined with the target value |△S i | Determine whether the near-end magnetic head and the far-end magnetic head need to be put into operation; when they need to be put into operation, the lifting roller mechanism rises to separate the incoming steel plate from the transport roller, the magnetic centering mechanism works, and the magnetic head drives the steel plate to move toward the target direction and the centering distance through the magnetic tape; S7. After the steel plate centering operation is completed, the magnetic head of the magnetic centering mechanism is demagnetized and returns to the initial position. The lifting roller mechanism descends to place the steel plate on the transport roller and transfers it to the rolling shear equipment. According to the fixed side shear line GD of the rolling shear, 0 The finished steel plate width B is determined by the shear line YD on the moving side of the rolling shear C The fixed side shearing blade of the rolling shear and the movable side shearing blade of the rolling shear jointly complete the edge shearing on both sides of the steel plate.

[0011] Furthermore, S2 specifically includes the following steps: The position of the fixed side shear line of the rolling shear where the shear blade of the fixed side rolling shear is located remains unchanged, so that the laser line emitted by the laser marking instrument on the fixed side coincides with the fixed side shear line of the rolling shear; Based on the determined finished steel plate width and the shear line on the fixed side of the rolling shear, the position of the shear line on the moving side of the rolling shear is obtained, so that the laser line emitted by the laser marking instrument on the moving side coincides with the shear line on the moving side of the rolling shear.

[0012] Furthermore, S3 specifically includes the following steps: S31, calculating the length of the incoming steel plate and the head positioning dimension value of the incoming steel plate; After the incoming steel plate arrives at the entrance area of ​​the rolling shearing device, the first online metal detector at the far end of the rolling shearing device tracks and determines the length of the incoming steel plate; the second online metal detector at the near end of the rolling shearing device calculates and determines the head positioning dimension value of the incoming steel plate based on the length of the incoming steel plate; Length of incoming steel plate L i Calculated from the incoming steel plate line speed and running time, the length range of the incoming steel plate is as follows: L i =(5i,5(i+1)], (i=1,2,3,4,…,n); The calculation formula for the head positioning dimension value of the incoming steel plate is as follows: ; S32. Determine the selection of the remote magnetic head according to the length of the incoming steel plate; A first magnetic head, a second magnetic head, ..., an nth magnetic head are arranged on a plurality of magnetic centering mechanisms arranged from the proximal end to the distal end; the proximal magnetic head is fixedly selected as the first magnetic head, and the selection formula of the distal magnetic head is as follows: n×5<L n ≤(n+1)×5.

[0013] Furthermore, S4 specifically includes the following steps: S41. Use the laser rangefinder set on the moving side of the magnetic centering mechanism where the distal magnetic head and the proximal magnetic head are located to detect the distance between the laser rangefinder and the edge contour of the steel plate to obtain the edge distance; the distance between the laser rangefinder and the shear line on the fixed side of the rolling shear is the positioning distance, and the fixed side distance is obtained based on the positioning distance and the edge distance. The formula is as follows: S i =SU i Among them, S i is the fixed side distance, S is the positioning distance, U is the fixed side distance, i is the edge distance; S42. Based on the initial positions of the proximal magnetic head and the distal magnetic head, the fixed side distance and the initial width of the incoming steel plate, the intersection of the center line of the incoming steel plate and the light beam emitted by the corresponding laser rangefinder is taken as the centering position, and the centering distance is calculated. The formula is as follows: d i = S i -(S 0 +B 0 / 2), (i=1,2,3,4,…,n) Among them, d i To find the middle distance, S 0 is the initial position of the magnetic head, B 0 It is the initial width of the incoming steel plate.

[0014] Further, in S5, the formula of the centering distance is as follows: △S i = S i -(B 0 / 2+B C / 2), (i=1,2,3,4,…,n) Among them, △S i is the centering distance, B C The width of the finished steel plate.

[0015] Furthermore, the specific determination method of S6 is as follows: If the near-end head or far-end head needs to move the centering distance |△S i | If it is less than or equal to the specified value, there is no need to align the steel plate; If the near-end head or far-end head needs to move the centering distance |△Si | is greater than the specified value, the magnetic head will first complete the steel plate centering operation after magnetization; Then, the laser rangefinder detects the distance U of the moving side of the incoming steel plate. i , converted into the respective fixed side distance S i , judge |S i |with|B 0 / 2+B C / 2| is greater than the specified value; if it is greater than the specified value, the steel plate centering operation is performed; if it is less than the specified value, the steel plate centering operation is terminated.

[0016] Compared with the prior art, the present invention has the following advantages: The present invention realizes accurate centering detection and positioning of the width of finished steel plates through high-precision detection instruments such as laser scribers and laser rangefinders, gets rid of the traditional technology's reliance on manual visual observation, realizes the drawbacks of steel plate edge alignment and manual adjustment of steel plate centering operations, and improves steel plate centering efficiency and accuracy.

[0017] The present invention adopts a preset model for steel plate shearing and a self-learning method to accurately match and select a magnetic head combination according to the length of the incoming steel plate and the head positioning size, thereby avoiding the use of redundant magnetic heads, reducing energy consumption, and realizing the green, low-carbon and energy-saving and consumption-reducing automatic alignment of steel plates.

[0018] The present invention quantifies the centering distance value in the width direction of the finished steel plate through steel plate edge contour recognition and offset calculation, overcomes technical difficulties such as video image network delay and self-brightness attenuation, and breaks the traditional technology's reliance on remote camera to extract steel plate contours. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 It is a schematic diagram of the planar layout of the device of the present invention; Figure 2 yes Figure 1 AA section view; Figure 3 It is a schematic diagram of the arrangement of the magnetic head and the online metal detector of the magnetic centering mechanism of the present invention; Figure 4 It is a schematic diagram of the excitation operation of the first magnetic head and the second magnetic head of the present invention; Figure 5It is a schematic diagram of the excitation operation of the first magnetic head and the third magnetic head of the present invention; Figure 6 It is a schematic diagram of the excitation operation of the first magnetic head and the fourth magnetic head of the present invention; Figure 7 It is a schematic diagram of the excitation operation of the first magnetic head and the fifth magnetic head of the present invention; Figure 8 It is a schematic diagram of the excitation operation of the first magnetic head and the nth magnetic head of the present invention; Fig. 9 This is a schematic diagram of the inclined arrangement of incoming steel plates of the present invention; Fig.10 It is a schematic diagram of determining the centering distance of a steel plate according to the present invention; Fig.11 It is a schematic diagram for determining the centering distance of the steel plate of the present invention; Fig.12 The present invention is a flow chart of the automatic centering operation of steel plates.

[0021] In the figure: 1. Laser marking device; 101. Motor; 102. Speed ​​reducer; 103. Lead screw; 104. Fixed side laser marking instrument; 105. Mobile side laser marking instrument; 2. Magnetic centering mechanism; 201. Transverse hydraulic cylinder; 202. Frame; 203. Magnetic head; 2031. First magnetic head; 2032. Second magnetic head; 2033. Third magnetic head; 2034. Fourth magnetic head; 2035. Fifth magnetic head; 2036. Sixth magnetic head; 203n. Nth magnetic head; 204. Laser rangefinder; 3. Lifting roller mechanism; 4. Crossbeam; 5. Transport roller; 6. Mobile side rolling shear; 7. Fixed side rolling shear; 8. Shear blade; 9. First online metal detector; 10. Second online metal detector; Q. Steel plate running direction; YD 0 , initial position; YD 1 , maximum stroke position; YD, shear line of mobile side rolling shear; GD 0 , shear line of fixed side rolling shear; M, center line of transport roller; N, center line of incoming steel plate; λ, installation distance; Z 0 , original distance; Z 1 , lateral displacement; Z max , maximum travel distance; B max , Maximum finished board width; B min , minimum finished board width; B c , finished steel plate width; Z gx , working travel distance; L r0 , head positioning size, r=1,2,3,4,…,n; L i , length of incoming steel plate, i=1,2,3,4,…,n; B 0 , initial width of incoming steel plate; B 1, the right side of the minimum finished board width; B 2 , the right side position of the maximum finished board width; S, positioning distance; S 0 , initial distance; S 1 , distance from the near end magnetic head fixed side; U 1 , the distance from the near end magnetic head edge; S 2 , the distance from the far end magnetic head fixed side; U 2 , the distance from the far end magnetic head edge; d 1 , find the middle distance from the near end; d 2 , find the middle distance at the far end; △S 1 , near end center distance; △S 2 , remote center distance; O 1 , initial position of the proximal head; O 2 , initial position of the far-end magnetic head; P 1 , near-end magnetic head centering position; P 2 , remote head centering position; R 1 , near-end magnetic head centering position; R 2 , the remote magnetic head centering position; θ, the angle between the center line N of the incoming steel plate and the center line M of the transport roller; L 12 , the distance between the first head and the second head; L 23 , the distance between the second head and the third head; L 34 , the distance between the third head and the fourth head; L 45 , the distance between the fourth head and the fifth head; L 56 , the distance between the fifth head and the sixth head. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0025] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be clear that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0026] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0027] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0028] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0029] The present invention can solve the technical problems and quality problems that steel plant users are highly concerned about and urgently need to eliminate during the steel plate centering process, and ultimately realize automatic centering of steel plates, thereby comprehensively improving centering accuracy and production efficiency.

[0030] like Figure 1As shown, the present invention provides an automatic centering device for steel plates, comprising a laser marking device 1, a magnetic centering mechanism 2, a lifting roller mechanism 3 and a rolling shear device arranged in the inlet area of ​​the rolling shear device; the rolling shear device comprises a relatively movable side rolling shear 6 and a fixed side rolling shear 7, the center axis between the two rolling shears is the center line M of the transport roller; one side of the center line M of the transport roller is the movable side, and the other side of the center line M of the transport roller is the fixed side; the inlet area of ​​the rolling shear device is close to the rolling shear as the proximal end, and the inlet area of ​​the rolling shear device is far away from the rolling shear as the far end; a crossbeam 4 is arranged oppositely on the movable side and the fixed side, the crossbeam 4 is arranged parallel to the center line M of the transport roller, and a plurality of magnetic centering mechanisms 2, lifting roller mechanisms 3 and a transport roller 5 are arranged on the crossbeam 4. A laser marking device 1 is arranged at the proximal end and the far end of the crossbeam 4, respectively, the proximal end is about 20m away from the shear center line of the rolling shear, and the far end is about 20m away from the proximal end, which is slightly adjusted according to the production process. The magnetic centering mechanism 2 is arranged below the steel plate, and the lifting roller mechanism 3 and the transport roller 5 are arranged below the steel plate. The steel plate runs on the transport roller 5 according to the running direction Q of the steel plate. Under the joint action of the laser scribing device 1, the magnetic centering mechanism 2, the lifting roller mechanism 3, the rolling shearing device, and the transport roller 5, the present invention completes the automatic centering of the steel plate and the alignment of the edges on both sides, so that the rolling shear blade 8 can roll and shear the edge of the steel plate.

[0031] Laser marking device 1 is used to calibrate the finished steel plate width B C The core equipment mainly includes the following parts: motor 101, reducer 102, lead screw 103, fixed side laser scriber 104, and movable side laser scriber 105. The position of the fixed side laser scriber 104 is relatively fixed, and the laser line emitted by it is aligned with the shear line GD of the fixed side of the rolling shear. 0 Under the driving action of the motor 101, the reducer 102 drives the lead screw 103 to move the moving side laser scriber 105 left and right, according to the finished steel plate width B C The lateral movement stroke of the moving-side laser marking instrument 105 is determined.

[0032] The magnetic centering mechanism 2 is the core equipment for steel plate centering and side alignment, and mainly includes a lateral hydraulic cylinder 201, a frame 202 and a magnetic head 203. i Determine the combination of the magnetic centering mechanism 2 that is put into use, and the transverse hydraulic cylinder 201 drives the magnetic head 203 to transversely move along the frame 202 (perpendicular to the center line M of the transport roller), thereby pushing the inclined steel plate to achieve automatic centering, ensuring that the two sides of the finished steel plate are respectively aligned with the shear line GD of the fixed side of the rolling shear along the width direction. 0 , the shear line YD on the moving side of the rolling shear coincides.

[0033] The lifting roller mechanism 3 drives the support beam to lift and lower through the lifting hydraulic cylinder. When the support beam is lifted, the bottom surface of the steel plate can be separated from the top surface of the transport roller 5, which is convenient for the magnetic centering mechanism 2 to complete the centering of the steel plate.

[0034] The transport roller 5 drives the steel plate into the entrance area of ​​the rolling shearing device through the motor-driven roller. When the steel plate completes the centering operation, the transport roller 5 is started again to drive the steel plate into the rolling shearing device to complete the edge shearing of the steel plate.

[0035] The rolling shearing equipment is the core equipment for longitudinal shearing of steel plates. The fixed side shearing blades 8 and the movable side shearing blades 8 arranged on both sides of the center line M of the transport roller perform longitudinal trimming operations on the edges of the steel plates.

[0036] The technical principle of automatic steel plate centering is as follows: The steel plate is transported to the entrance area of ​​the rolling shearing device via the transport roller 5. After the trimming amount on both sides of the original steel plate is known according to the determined width of the finished steel plate, a laser line is emitted from the fixed side and the moving side of the single laser scribing device 1 respectively, and the four laser lines of the two laser scribing devices 1 overlap with each other. In the initial state, the laser line emitted from the fixed side of the laser scribing device 1 overlaps with the shear line GD of the fixed side of the rolling shearing device. 0 Overlap, and use this as the positioning reference, according to the finished steel plate width B C Determine the position of the laser line emitted from the moving side of the laser scribing device 1 to ensure that the shear line YD on the moving side of the rolling shear coincides with the laser line emitted from the moving side of the laser scribing device 1. At this time, the range framed by the laser lines emitted by the two sets of laser scribing devices 1 is the width of the finished steel plate, and also coincides with the two sides of the incoming steel plate after being centered and cut by the rolling shear.

[0037] After that, the lifting roller mechanism 3 lifts the steel plate off the transport roller 5 (to prevent the bottom of the steel plate from being scratched by friction with the top surface of the transport roller 5 during the lateral movement of the steel plate). i Determine the combination of the magnetic centering mechanism 2 to be put into use, and the laser rangefinder 204 of the magnetic centering mechanism 2 is based on the initial width B of the incoming steel plate. 0 Determine the middle distance d i , and combined with the laser line emitted by the laser scribing device 1, the shear line GD on the fixed side of the rolling shear 0 , shear line YD on the moving side of the rolling shear, initial width B of the incoming steel plate 0 and finished steel plate width B C , comprehensively determine the centering distance △S of the steel plate i Finally, the magnetic head 203 of the magnetic centering mechanism 2 is energized to push the steel plate to complete the automatic centering and edge alignment operations.

[0038] After the automatic centering of the steel plate is completed, the magnetic head 203 of the magnetic centering mechanism 2 is demagnetized and returns to the initial position, the lifting roller mechanism 3 descends to place the steel plate on the transport roller 5, and is transmitted to the rolling shearing equipment to complete the edge shearing on both sides of the steel plate.

[0039] The present invention also provides a method for automatic centering of a steel plate, the specific steps of which are as follows: 1. Calibration of the two laser lines of the laser marking device (determine the width B of the finished steel plate C ): like Figure 2 As shown, the present invention provides a laser marking device, which calibrates the width of the finished steel plate by two laser lines emitted by it. The screw 103 of the laser marking device 1 is located above the conveyor roller 5 as a whole. Two groups of laser marking instruments are set on the screw 103. The fixed side laser marking instrument 104 is located on the left side of the screw 103. The laser line emitted by it is aligned with the fixed side shear line GD of the rolling shear. 0 The initial position of the moving side laser marking instrument 105 is set at the initial position YD 0 and the distance from the fixed side laser scriber 104 is the original distance Z 0 The laser marking instrument 105 on the movable side can move left and right along the lead screw 103, and the moving range of the laser line emitted by it is between the initial position YD 0 With maximum stroke position YD 1 Between, maximum travel position YD 1 It is the maximum travel distance Z that the moving side laser marking instrument 105 can move to the right max .

[0040] Finished steel plate width B C Between the minimum finished board width B min The maximum finished board width B max In combination with the material type and size specifications of the incoming steel plate, the target width of the finished steel plate is formulated, with the finished steel plate width B C The left side is the reference and the shear line GD on the fixed side of the rolling shear 0 Overlap, finished steel plate width B C The right side coincides with the shear line YD on the moving side of the rolling shear. The travel range of the shear line YD on the moving side of the rolling shear is between the initial position YD 0 With maximum stroke position YD 1 Between 0 , YD 1 ], which is consistent with the universal applicability of the working principle of the laser scribing device.

[0041] To ensure the finished steel plate width B C The centering accuracy and detection effectiveness of the laser marking instrument, the initial position YD of the moving side laser marking instrument 105 0 Located at position B on the right side of the minimum finished board width1 The left end of the minimum finished board width B min Value(GD 0 , B 1 ]; Maximum stroke position YD 1 Located at position B on the right side of the maximum finished board width 2 The right end of the maximum finished board width B max Value(GD 0 , B 2 ].

[0042] The following two particularities also conform to the principle of universal applicability: 1) When the finished steel plate width B C = Minimum finished board width B min :Combined with the material type and size specifications of the incoming steel plate, the target width of the finished steel plate is set to be the minimum finished plate width B min When the minimum finished board width B min The left side is the reference and the shear line GD on the fixed side of the rolling shear 0 Overlap, minimum finished board width B min The right side coincides with the shear line YD on the moving side of the rolling shear; the right side position of the minimum finished plate width is B 1 Located at the initial position YD of the laser marking instrument 105 on the mobile side 0 At the right end, when the laser line emitted by the moving side laser marking instrument 105 changes from the initial position YD 0 Rightward running lateral distance Z 1 After that, the shear line YD on the moving side of the rolling shear and the laser line emitted by the moving side laser marking instrument 105 are at the right position B of the minimum finished plate width. 1 Overlap at the same place and meet the minimum finished board width B min = Original distance Z 0 +Transverse distance Z 1 Relational.

[0043] 2) When the finished steel plate width B C = Maximum finished board width B max :Combined with the material type and size specifications of the incoming steel plate, the target width of the finished steel plate is set to be the maximum finished plate width B max When the maximum finished board width B max The left side is the reference and the shear line GD on the fixed side of the rolling shear 0 Overlap, maximum finished board width B max The right side coincides with the shear line YD on the moving side of the rolling shear; the right side position of the maximum finished plate width is B 2 Located at the maximum travel position YD of the laser marking instrument on the moving side 1 Left end, when the laser line emitted by the moving side laser marking instrument 105 changes from the initial position YD 0 Rightward running lateral distance Z 1+Working distance Z gx After that, the shear line YD on the moving side of the rolling shear and the laser line emitted by the moving side laser marking instrument 105 are at the right position B of the maximum finished plate width. 2 overlapped at the same place and met the maximum finished plate width B max = Original distance Z 0 +Transverse distance Z 1 +Working distance Z gx (or maximum finished board width B max = Minimum finished board width B min +Working distance Z gx ) relational expression.

[0044] More specifically, the effective travel range of the rolling shear moving side shear line YD / moving side laser marking instrument 105 is between the initial position YD 0 Position B on the right side of the maximum finished board width 2 Between 0 , B 2 ].

[0045] 2. Centering distance d of magnetic centering mechanism i and centering distance △S i Confirm (to achieve automatic centering of steel plate): Multiple groups of magnetic centering mechanisms 2 are arranged between multiple groups of transport rollers 5 and lifting roller mechanisms 3. Each group of magnetic centering mechanisms 2 is provided with a group of laser rangefinders 204 near the moving side to detect the edge contour of the incoming steel plate near the moving side. First, according to the length L of the incoming steel plate i , determine the combination of magnetic centering mechanism 2 to be put into use; secondly, according to the initial width B of the incoming steel plate 0 , determine the middle distance d i ; Third, combine the rolling shear to fix the side shear line GD 0 , shear line YD on the moving side of the rolling shear, initial width B of the incoming steel plate 0 and finished steel plate width B C , comprehensively determine the centering distance △S of the steel plate i ; Finally, according to |△S i |The numerical value is used to determine whether the steel plate centering and side alignment work is completed.

[0046] 1) Determine the combination of magnetic centering mechanisms to be used like Figure 3-Figure 8 As shown, the present invention provides a schematic diagram of the excitation working principle of various magnetic head combinations, by calculating the length L of the incoming steel plate i and head positioning size L r0, determine the final magnetic head combination (excitation state) and mark the black dot display. Along the entrance area of ​​the rolling shearing equipment from the near end to the far end, the second online metal detector 10, the first magnetic head 2031, the first magnetic head 2031, the second magnetic head 2032, the third magnetic head 2033, the fourth magnetic head 2034, the fifth magnetic head 2035, the sixth magnetic head 2036, ..., the nth magnetic head 203n, the first online metal detector 9 are arranged in sequence, and the steel plate running direction Q reaches the entrance area of ​​the rolling shearing equipment from the far end to the near end through multiple groups of transport rollers 5.

[0047] When the incoming steel plate arrives at the entrance area of ​​the rolling shearing device, the first online metal detector 9 can track and determine the length L of the incoming steel plate according to known conditions such as the linear speed and running time of the incoming steel plate. i ;The head positioning dimension L of the incoming steel plate r0 This is achieved through the second online metal detector 10. When the head of the incoming steel plate passes through the second online metal detector 10, the head positioning size L of the incoming steel plate can be calculated and determined based on the known conditions such as the installation distance λ between the second online metal detector 10 and the first magnetic head 2031 and the linear speed of the steel plate. r0 value.

[0048] Determine the length L of the incoming steel plate i After that, two sets of magnetic head combinations are selected to match the incoming steel plate length L through the steel plate shearing preset model and the steel plate size database under the adaptive learning procedure. i , the head matching combination is shown in Appendix 1: Appendix 1 Head combination method

[0049] The length L of the incoming steel plate can be determined from Appendix 1 i and head positioning size L r0 , the values ​​of both are as follows: L i =(5i,5(i+1)]m,(i=1,2,3,4,…,n)(1) (2) 2) Determine the middle distance d i Each set of magnetic centering mechanism 2 is provided with a set of laser distance meter 204 near the moving side, and each set of laser distance meter 204 is close to the shear line GD of the fixed side of the rolling shear. 0 The positioning distance is a constant value S; each set of magnetic centering mechanism 2 has a set of magnetic heads 203, and the initial position of the proximal magnetic head is O 1 , initial position of the remote head O 2 Fixed side shear line GD with rolling shear 0 The initial distance is S0 Remain unchanged.

[0050] like Figure 9-11 As shown, the present invention provides a principle diagram of automatic centering of steel plates, which illustrates the whole process of inclined incoming steel plates successively going through centering distance determination, centering distance determination, and finally completing automatic centering of the steel plates, laying a theoretical foundation for the subsequent smooth completion of longitudinal shearing of the edges of the steel plates.

[0051] When the incoming steel plate (initial width B 0 ) After arriving at the entrance area of ​​the rolling shearing equipment, they are basically arranged in an inclined state, that is, there is a certain angle θ between the center line N of the incoming steel plate and the center line M of the transport roller; in this state, the laser rangefinder 204 usually first detects the edge contour of the incoming steel plate close to the moving side, and obtains the edge distance U i ; According to the edge distance U i , positioning distance S, converted to the shear line GD between the moving side of the unloaded steel plate and the fixed side of the rolling shear 0 Fixed side distance S i , and there is S i =SU i , (i=1,2,3,4,…,n) (3) Each group of heads is based on the initial position and the fixed side distance S i The initial width B of the incoming steel plate 0 , the intersection of the incoming steel plate center line N and the corresponding laser rangefinder 204 is the centering position, and the centering distance d to be moved is calculated. i , and there are d i = S i -(S 0 +B 0 / 2), (i=1,2,3,4,…,n) (4) 3) Determine the centering distance △S i From the above content, we can know that finding the middle distance d i The initial width B of the incoming steel plate is obtained by the laser distance meter 204. 0 The edge shearing position on both sides of the steel plate is determined by the fixed side shearing line GD of the rolling shear. 0 , the shear line YD on the moving side of the rolling shear is determined, so the center distance △S i The finished steel plate width B C Determine specific values ​​for your benchmark.

[0052] Each group of magnetic heads can be adjusted according to the finished steel plate width B C , Fixed side distance S i The initial width B of the incoming steel plate0 , find the middle position d in each group i As a reference, the centering distance △S to be moved can be calculated i , and there are △S i = S i -(B 0 / 2+B C / 2), (i=1,2,3,4,…,n) (5) If the distance between the two sets of magnetic heads used for magnetic excitation is large, several sets of magnetic heads need to be raised in the middle. They are not excited but only assist in supporting the steel plate to prevent the middle of the thin plate from collapsing, which would affect the centering accuracy of the steel plate and the shearing quality of the finished product.

[0053] 4) Based on |△S i |The value is used to determine whether the steel plate alignment is completed Determine whether the centering distance that each group of magnetic heads needs to move satisfies |△S i |≤4mm: ① If the centering distance |△Si| that a group of magnetic heads needs to move is ≤4mm, then this group of magnetic heads does not need to perform centering operation on the steel plate; ② If a group of magnetic heads needs to move the centering distance |△S i |>4mm, then after the magnetization, the magnetic head group first completes the steel plate centering operation; then, the laser rangefinder 204 detects the distance U of the moving side of the incoming steel plate. i , converted into the respective fixed side distance S i , judge |S i |with|B 0 / 2+B C / 2| is greater than 4mm; if "yes", perform the steel plate centering operation; if "no", end the steel plate centering operation.

[0054] The present invention is suitable for rolling shearing equipment of medium and thick plate production lines, covering rolling shearing equipment of various specifications such as 3000mm, 3500mm, 3800mm, 4200mm, 4300mm, 5000mm, 5600mm, etc. It is mainly used for automatic centering and alignment of both sides of the steel plate before shearing, so as to improve the shearing quality and yield rate of the finished steel plate.

[0055] Example In order to further illustrate the technical solution of the present invention, the steel plate automatic centering process method of the present invention is further described as follows in combination with the embodiments: In order to simplify the automatic centering process of steel plates, this magnetic head combination is explained by taking the first magnetic head 2031 + the second magnetic head 2032 as an example. The automatic centering of steel plates is achieved under the joint action of the laser scribing device 1, the magnetic centering mechanism 2, the lifting roller mechanism 3, the rolling shear equipment, and the transport roller 5. The magnetic centering mechanism 2 is the core equipment for centering and aligning the side edges of steel plates. The magnetic centering mechanism 2 drives the magnetic head 203 to move horizontally along the frame 202 (perpendicular to the center line of the transport roller) through the transverse hydraulic cylinder 201, pushing the inclined steel plates to achieve automatic centering, ensuring that the two sides of the finished steel plates are aligned with the fixed side shearing line GD of the rolling shear in the width direction. 0 , the shearing line YD of the moving side of the rolling shear coincides, making it convenient for the shearing blade 8 of the rolling shear to roll and shear the edge of the steel plate.

[0056] like Fig.12 As shown, the present invention provides an operation flow chart of automatic centering of steel plates, which vividly reproduces the entire process of automatic centering of steel plates through a nine-step method, and can effectively improve the production efficiency of wide and thick plate production lines and the shearing quality of steel plates.

[0057] The specific operation process and working method of automatic steel plate centering include the following steps: In the first step, the automatic centering process of the steel plate starts.

[0058] In the second step, the steel plate reaches the entrance area of ​​the rolling shear equipment.

[0059] The incoming steel plate is transported to the entrance area of ​​the rolling shearing device via the transport roller 5, and the lifting roller mechanism 3 is located as a whole below the transport roller 5 and is separated from the incoming steel plate.

[0060] When the transport roller 5 is working, the magnetic centering mechanism 2 and the lifting roller mechanism 3 stop running, and both are not allowed to work at the same time as the transport roller 5.

[0061] Step 3: The laser marking device calibrates the shear line position GD on both sides of the rolling shear 0 and YD Two sets of laser scribing instruments are arranged on the lead screw 103 of the laser scribing device 1. The fixed side laser scribing instrument 104 is located on the left side of the lead screw 103. The laser line emitted by the laser scribing instrument is aligned with the fixed side shear line GD of the rolling shear. 0 The moving side laser marking instrument 105 can be moved horizontally along the lead screw, and the laser line emitted by it coincides with the shear line YD on the moving side of the rolling shear; YD is between the initial position YD 0 With maximum stroke position YD 1 Between. Rolling shear fixed side cutting line GD 0 The distance from the shear line YD on the moving side of the rolling shear is the width B of the finished steel plate. C value.

[0062] The fourth step is to determine the length of the incoming steel plate according to its length L. i , determine the combination of magnetic centering mechanisms to be used.

[0063] After the incoming steel plate reaches the entrance area of ​​the rolling shearing device, the first online metal detector 9 at the far end of the rolling shearing device tracks and determines the length L of the incoming steel plate. i The second online metal detector 10 at the proximal end of the rolling shearing device calculates and determines the head positioning size L of the incoming steel plate r0 value.

[0064] Determine the length L of the incoming steel plate i After that, two sets of magnetic head combinations are selected to match the incoming steel plate length L through the steel plate shearing preset model and the steel plate size database under the adaptive learning procedure. i , in order to better improve the utilization rate of the magnetic head and achieve green, low-carbon and energy-saving and consumption-reducing equipment.

[0065] Incoming steel plate length L i and head positioning size L r0 , the values ​​of both are as follows: L i =(5i,5(i+1)]m,(i=1,2,3,4,…,n)

[0066] Because the present embodiment selects a magnetic head combination of the first magnetic head 2031 + the second magnetic head 2032, that is, the first magnetic head 2031 is a proximal magnetic head, and the second magnetic head 2032 is a distal magnetic head, therefore: Incoming steel plate length L 1 =(5, 10]m, that is, 5m<L 1 ≤10m Head positioning size L 10 =L 1 / 2-2m, L 10 Value range (0.5, 3]m Step 5: Determine the middle distance d i The center line N of the incoming steel plate and the center line M of the transport roller are generally arranged in an inclined state (angle θ). A laser rangefinder 204 is set on the moving side of each set of magnetic centering mechanism 2. According to the edge profile of the steel plate detected by the laser rangefinder 204, the edge distance U can be determined by light speed × time (half of the round-trip time of the laser rangefinder emitting the light beam). i , that is, the following U 1 and U 2 ; According to the edge distance U i , positioning distance S, converted to fixed side distance S i , and there is Si =SU i , (i=1,2,3,4,…,n) Because the present embodiment selects the magnetic head combination of the first magnetic head 2031 + the second magnetic head 2032, the distance between the two fixed sides is: S 1 =SU 1 ; S 2 =SU 2 ; Each set of magnetic centering mechanism 2 is provided with a set of magnetic heads 203. Each set of magnetic heads is arranged according to the initial position, the fixed side distance S i The initial width B of the incoming steel plate 0 , and the initial position of the proximal head is O 1 , initial position of the remote head O 2 Fixed side shear line GD with rolling shear 0 The initial distance is S 0 The intersection of the center line N of the incoming steel plate and the light beam emitted by the corresponding laser rangefinder 204 is taken as the centering position, and the centering distance d is calculated. i , and there are: d i = S i -(S 0 +B 0 / 2), (i=1,2,3,4,…,n) Because the present embodiment selects the magnetic head combination of the first magnetic head 2031 + the second magnetic head 2032, the two sets of centering distances are: d 1 = S 1 -(S 0 +B 0 / 2); d 2 = S 2 -(S 0 +B 0 / 2); Among them, U 1 is the distance to the edge of the near-end magnetic head; U 2 is the distance to the far end magnetic head edge; S 1 S is the distance to the near-end magnetic head fixed side; 2 is the distance to the fixed side of the far end magnetic head; d 1 Find the middle distance for the near end; d 2 Find the middle distance for the far end; Step 6: Determine the centering distance △S i Because the edge shearing position on both sides of the steel plate is fixed by the rolling shear side shear line GD 0, the shear line YD on the moving side of the rolling shear is determined, so the center distance △S i The finished steel plate width B C Determine specific values ​​for your benchmark.

[0067] Each group of magnetic heads is based on the finished steel plate width B C , Fixed side distance S i The initial width B of the incoming steel plate 0 , use the near end magnetic head to find the center position R 1 , Remote head centering position R 2 As a reference, combined with the near-end magnetic head alignment position P 1 , remote head centering position P 2 After that, the centering distance △S can be calculated. i , and there are △S i = S i -(B 0 / 2+B C / 2), (i=1,2,3,4,…,n) Because the present embodiment selects the magnetic head combination of the first magnetic head 2031 + the second magnetic head 2032, therefore: The center distance between the two groups: △S 1 = S 1 -(B 0 / 2+B C / 2) △S 2 = S 2 -(B 0 / 2+B C / 2) Among them, △S 1 is the near end centering distance; △S 2 is the far end centering distance; Afterwards, the displacement is moved in the target direction by the centering distance, with the displacement of the magnetic head from the fixed side to the movable side being positive and the displacement from the movable side to the fixed side being negative.

[0068] Because the distance between the first magnetic head 2031 and the second magnetic head 2032 engaged in the magnetizing operation is not too large, there is no need to lift the non-magnetizing magnetic head to assist in supporting the steel plate.

[0069] Step 7: Target value determination, satisfying |△S i |≤4mm According to the centering distance that each group of magnetic heads needs to move |△S i |≤4mm, in order to determine whether the group of magnetic heads is energized and put into operation, and complete the automatic centering operation of the steel plate.

[0070] Because the present embodiment selects the magnetic head combination of the first magnetic head 2031 + the second magnetic head 2032, therefore: 1. If the centering distance of the first magnetic head 2031 |△S 1 |, centering distance of the second magnetic head 2032 | △S 2 |, if both sets of magnetic heads meet the judgment value ≤4mm, then the magnetic head combination does not need to perform centering operation on the steel plate, and directly enters the eighth step; 2. If the centering distance of the first magnetic head 2031 |△S 1 |, centering distance of the second magnetic head 2032 | △S 2 |, if any group satisfies the judgment value>4mm, then the magnetic head of this group completes the steel plate centering operation after excitation. Then, return to step 5, and detect the moving side distance U of the incoming steel plate according to the laser rangefinder 204. i , converted into the respective fixed side distance S i , judge again |S i |with|B 0 / 2+B C / 2| is the difference ≤4mm. If "yes", go to step 8, if "no", return to step 5.

[0071] 3. Repeat the target value determination until the centering distances of the two sets of magnetic heads meet |△S i |≤4mm, the steel plate alignment process is completed.

[0072] In the eighth step, the rolling shearing equipment completes the shearing of the steel plate edges.

[0073] The magnetic head 203 of the magnetic centering mechanism 2 returns to the initial position after demagnetization, and the lifting roller mechanism 3 descends to place the steel plate on the transport roller 5 and transfers it to the rolling shear equipment. 0 The finished steel plate width B is determined by the shear line YD on the moving side of the rolling shear C The fixed side shearing blade 8 of the rolling shear and the movable side shearing blade 8 of the rolling shear jointly complete the edge shearing on both sides of the steel plate.

[0074] Step 9: The workflow ends.

[0075] At this point, the entire steel plate automatic centering workflow is completed and enters the next work cycle.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steel plate automatic centering device, characterized in that: It includes a laser marking device, a magnetic centering mechanism, a lifting roller mechanism and a rolling shearing device arranged at the entrance area of ​​the rolling shearing device; The rolling shearing device comprises two rolling shears arranged opposite to each other, the central axis between the two rolling shears is the center line of the conveying roller; one side of the center line of the conveying roller is the moving side, and the other side of the center line of the conveying roller is the fixed side; the entrance area of ​​the rolling shearing device is the side close to the rolling shears as the proximal end, and the entrance area of ​​the rolling shearing device is the side away from the rolling shears as the distal end; A crossbeam is arranged opposite to the movable side and the fixed side. The crossbeam is arranged parallel to the center line of the transport roller. Several magnetic centering mechanisms, lifting roller mechanisms and transport rollers are arranged on the crossbeam. A laser marking device is arranged at the near end and the far end of the crossbeam respectively. The magnetic centering mechanism, lifting roller mechanism and transport roller are arranged under the steel plate.

2. The automatic steel plate centering device according to claim 1, characterized in that: The laser marking device includes a motor, a reducer, a lead screw, a laser marking instrument on the mobile side and a laser marking instrument on the fixed side which are connected in sequence from the mobile side to the fixed side. The laser marking instrument on the mobile side moves in a direction perpendicular to the center line of the transport roller, the lead screw is arranged perpendicular to the center line of the transport roller, the laser marking instrument on the fixed side and the laser marking instrument on the mobile side emit laser lines parallel to the center line of the transport roller, the laser line emitted by the fixed side laser marking instrument coincides with the shear line of the fixed side rolling shear, and the laser line emitted by the mobile side laser marking instrument coincides with the shear line of the mobile side rolling shear.

3. The automatic steel plate centering device according to claim 1, characterized in that: The distance between each transport roller and the adjacent transport roller is fixed, and a magnetic centering mechanism is arranged between every two transport rollers.

4. The automatic steel plate centering device according to claim 1, characterized in that: Each magnetic centering mechanism includes a transverse hydraulic cylinder, a frame and a magnetic head. The transverse hydraulic cylinder is connected to the frame. The magnetic head is arranged on the frame. The frame is arranged vertically on the center line of the transport roller.

5. A method for automatic centering of steel plates, implemented based on the automatic centering device for steel plates according to any one of claims 1 to 4, characterized in that: The steps include: S1. The incoming steel plate runs on several transport rollers toward the rolling shearing equipment. After the incoming steel plate reaches the entrance area of ​​the rolling shearing equipment, the transport roller stops running. At this time, the lifting roller mechanism and the magnetic centering mechanism are separated from the steel plate; S2. Based on the determined finished steel plate width, use a laser marking device to calibrate the shear line positions on both sides of the rolling shearing equipment; S3, calculate the length of the incoming steel plate and determine the combination of magnetic centering mechanisms to be used, i.e., the proximal magnetic head and the distal magnetic head; S4, using the laser rangefinder on the magnetic centering mechanism to determine the centering distance between the near-end magnetic head and the far-end magnetic head; S5. Based on the width of the finished steel plate and the centering distances of the proximal magnetic head and the distal magnetic head, the centering distances of the proximal magnetic head and the distal magnetic head are obtained; S6, based on the centering distance between the near-end head and the far-end head, combined with the target value |△S i | Determine whether the near-end magnetic head and the far-end magnetic head need to be put into operation; when they need to be put into operation, the lifting roller mechanism rises to separate the incoming steel plate from the transport roller, the magnetic centering mechanism works, and the magnetic head drives the steel plate to move toward the target direction and the centering distance through the magnetic tape; S7. After the steel plate centering operation is completed, the magnetic head of the magnetic centering mechanism is demagnetized and returns to the initial position. The lifting roller mechanism descends to place the steel plate on the transport roller and transfers it to the rolling shearing equipment. The finished steel plate width B is determined according to the shearing line GD0 on the fixed side of the rolling shear and the shearing line YD on the moving side of the rolling shear. C The fixed side shearing blade of the rolling shear and the movable side shearing blade of the rolling shear jointly complete the edge shearing on both sides of the steel plate.

6. The method for automatic centering of steel plates according to claim 5, characterized in that: S2 specifically includes the following steps: The position of the fixed side shear line of the rolling shear where the shear blade of the fixed side rolling shear is located remains unchanged, so that the laser line emitted by the laser marking instrument on the fixed side coincides with the fixed side shear line of the rolling shear; Based on the determined finished steel plate width and the shear line on the fixed side of the rolling shear, the position of the shear line on the moving side of the rolling shear is obtained, so that the laser line emitted by the laser marking instrument on the moving side coincides with the shear line on the moving side of the rolling shear.

7. The method for automatic centering of steel plates according to claim 5, characterized in that: S3 specifically includes the following steps: S31, calculating the length of the incoming steel plate and the head positioning dimension value of the incoming steel plate; After the incoming steel plate arrives at the entrance area of ​​the rolling shearing device, the first online metal detector at the far end of the rolling shearing device tracks and determines the length of the incoming steel plate; The second online metal detector at the proximal end of the rolling shearing device calculates and determines the head positioning dimension value of the incoming steel plate based on the length of the incoming steel plate; Length of incoming steel plate L i Calculated from the incoming steel plate line speed and running time, the length range of the incoming steel plate is as follows: L i =(5i,5(i+1)],(i=1,2,3,4,…,n); The calculation formula for the head positioning dimension value of the incoming steel plate is as follows: ； S32. Determine the selection of the remote magnetic head according to the length of the incoming steel plate; A first magnetic head, a second magnetic head, ..., an nth magnetic head are arranged on a plurality of magnetic centering mechanisms arranged from the proximal end to the distal end; the proximal magnetic head is fixedly selected as the first magnetic head, and the selection formula of the distal magnetic head is as follows: n×5<L n ≤(n+1)×5.

8. The method for automatic centering of steel plates according to claim 5, characterized in that: S4 specifically includes the following steps: S41. Use the laser rangefinder set on the moving side of the magnetic centering mechanism where the distal magnetic head and the proximal magnetic head are located to detect the distance between the laser rangefinder and the edge contour of the steel plate to obtain the edge distance; the distance between the laser rangefinder and the shear line on the fixed side of the rolling shear is the positioning distance, and the fixed side distance is obtained based on the positioning distance and the edge distance. The formula is as follows: S i =S-U i Among them, S i is the fixed side distance, S is the positioning distance, U i is the edge distance; S42. Based on the initial positions of the proximal magnetic head and the distal magnetic head, the fixed side distance and the initial width of the incoming steel plate, the intersection of the center line of the incoming steel plate and the light beam emitted by the corresponding laser rangefinder is taken as the centering position, and the centering distance is calculated. The formula is as follows: d i = S i -(S0+B0 / 2),(i=1,2,3,4,…,n) Among them, d i To find the center distance, S0 is the initial position of the magnetic head and B0 is the initial width of the incoming steel plate.

9. The method for automatic centering of steel plates according to claim 8, characterized in that: In S5, the formula for the centering distance is as follows: △S i = S i -(B0 / 2+B C / 2),(i=1,2,3,4,…,n) Among them, △S i is the centering distance, B C The width of the finished steel plate.

10. The method for automatic centering of steel plates according to claim 5, characterized in that: The specific determination method of S6 is as follows: If the near-end head or far-end head needs to move the centering distance |△S i | If it is less than or equal to the specified value, there is no need to align the steel plate; If the near-end head or far-end head needs to move the centering distance |△S i | is greater than the specified value, the magnetic head will first complete the steel plate centering operation after magnetization; Then, the laser rangefinder detects the distance U of the moving side of the incoming steel plate. i , converted into the respective fixed side distance S i , judge |S i | and |B0 / 2+B C / 2| is greater than the specified value; if it is greater than the specified value, the steel plate centering operation is performed; if it is less than the specified value, the steel plate centering operation is terminated.

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