Molded slab stop position length measuring system and control method thereof

Abstract

The application provides a kind of casting blank stop position length measuring system, it is characterized by: including the roller way system for conveying casting blank and the distance measuring equipment for controlling casting blank stop position and measuring the length of casting blank;The distance measuring equipment is 4, four distance measuring equipment is respectively arranged at the four top corners of roller stand, 4 distance measuring equipment is defined as LS1, LS2, LS3 and LS4 respectively;The intersection point of the connecting line between distance measuring equipment LS1 and distance measuring equipment LS3 and the connecting line between distance measuring equipment and distance measuring equipment LS2 and distance measuring equipment LS4 vertical projection coincides with the midpoint of the flow center line of roller way system;The length of the connecting line between distance measuring equipment LS1 and distance measuring equipment LS3 and the connecting line between distance measuring equipment and distance measuring equipment LS2 and distance measuring equipment LS4 is equal, wherein, distance measuring equipment LS1 and distance measuring equipment LS2 are located in the upstream of casting blank conveying direction.

Description

Technical Field

[0001] This invention relates to the field of continuous casting technology, and in particular to a billet stop-position length measurement system and its control method. Background Technology

[0002] Accurate control of the billet position on the roller conveyor is an important guarantee for the automation of continuous casting production. Especially in the billet weighing and pushing processes, an improper stopping position of the billet will cause uneven loading, increase the weighing error of the billet, reduce the service life of the pusher (stacking platform), and affect the improvement of the continuous casting production rate.

[0003] In actual production, there are two main methods for controlling the stopping position of the billet on the roller conveyor: The first method uses a through-beam laser detector. If the laser detector is positioned at a certain location on the roller conveyor, when the billet passes by, the laser detector changes from an illuminated state to an opaque state, indicating that the head of the billet has reached the detector position. Then, the roller conveyor motor is controlled to stop after a delay, and the head of the billet will generally stop within a relatively fixed position range. This billet stopping method can control the head of the billet to stop within a relatively fixed position range, while the tail of the billet stops at different positions on the roller conveyor due to its varying length. This billet stopping method is also called billet head positioning stopping. Due to the different lengths of the billet, there is uneven loading during processes such as weighing and pushing the billet off the line.

[0004] The second billet positioning control method employs a through-beam laser detector + roller conveyor motor rotary encoder (frequency converter) + billet cutting length setting. The laser detector is positioned at a specific location on the roller conveyor, and the corresponding roller conveyor motor is equipped with an encoder. The distance between the laser detector and the centerline of the weighing roller conveyor and the centerline of the pusher (stacking platform) is S1. When the billet is conveyed past, the laser detector changes from an illuminated state to an opaque state, indicating that the billet head has reached the detector position. Based on the received billet cutting length S2, the distance S3 between the billet centerline and the centerlines of the weighing roller conveyor and the pusher (stacking platform) is determined, where S3 = S1 + S2 / 2. The roller conveyor motor rotary encoder (frequency converter) starts counting, controlling the billet's conveying distance on the roller conveyor to S3 based on the number of roller rotations, thus aligning the billet centerline with the centerlines of the weighing roller conveyor and the pusher (stacking platform). This billet stopping method is also called billet center stopping. However, its actual application effect is not ideal for the following reasons: the stopping control requires prior knowledge of the billet cutting length. If the billet is removed from the line in advance, the received billet length will not match the actual billet length. In addition, there is slippage between the roller conveyor and the billet, and the actual conveying distance of the billet is inconsistent with the controlled travel distance, which will affect processes such as pushing the steel off the line.

[0005] Therefore, in order to solve the above-mentioned technical problems, it is urgent to propose a new technical approach. Summary of the Invention

[0006] In view of this, the purpose of this invention is to provide a billet stopping and length measuring system and its control method, which can effectively avoid the influence of external conditions on the billet stopping accuracy, and does not require the billet cutting length data to be determined in advance. It can also effectively avoid the influence of slippage between the conveying roller and the billet on the billet stopping accuracy, and can detect and warn whether the billet tilts during the conveying process, thereby avoiding eccentric loading in processes such as symmetrical casting and pushing steel off the line, and effectively ensuring continuous casting efficiency.

[0007] The present invention provides a billet stopping and length measuring system, characterized in that: it includes a roller conveyor system for transporting the billet and a distance measuring device for controlling the stopping position of the billet and measuring the length of the billet;

[0008] There are four ranging devices, which are respectively set at the four top corners of the roller conveyor frame. The four ranging devices are defined as LS1, LS2, LS3 and LS4.

[0009] The vertical projection of the intersection of the line connecting the distance measuring devices LS1 and LS3 with the line connecting the distance measuring devices LS2 and LS4 coincides with the midpoint of the casting flow centerline of the roller conveyor system.

[0010] The length of the line connecting the ranging devices LS1 and LS3 is equal to the length of the line connecting the ranging devices LS2 and LS4. Among them, the ranging devices LS1 and LS2 are located upstream of the billet conveying direction.

[0011] It also includes a controller, which is used to receive the distance measurement information output by the four distance measuring devices, and output the billet length dimension and control the drive mechanism of the roller conveyor according to the distance measurement information.

[0012] Furthermore, the ranging devices LS1 and LS2 are positioned within the α angle range, and the ranging devices LS3 and LS4 are positioned within the α angle range;

[0013] in: ; Indicates the minimum width of the cast billet. This indicates the maximum length of the cast billet.

[0014] Furthermore, the plurality of conveying rollers are arranged in parallel with equal spacing between adjacent conveying rollers, and the conveying roller corresponding to the set position of the roller conveyor frame is set as a weighing roller.

[0015] Furthermore, the ranging device is a laser rangefinder.

[0016] Accordingly, the present invention also provides a method for controlling the stop and length measurement of a cast billet based on the above system, comprising the following steps:

[0017] S1. The angle between the line connecting ranging devices LS1 and LS3 and the line connecting ranging devices LS2 and LS4, marked as β;

[0018] S2. Obtain the distance between the two relative vertices of the billet and the corresponding measuring device during the conveying process of the billet in the roller conveyor system. When the distance between the two relative vertices and the corresponding measuring device is equal, the current billet is accurately positioned.

[0019] S3. Determine the distances from the ranging devices LS1, LS2, LS3 and LS4 to the corresponding vertices of the billet as t1, t2, t3 and t4 respectively, and determine the length of the billet based on the distances t1, t2, t3 and t4 and the included angle β.

[0020] Furthermore, in step S3, the length L of the cast billet is determined by the following method:

[0021] ;

[0022] Where D1 and D2 are the vertical distances from the center line of the casting flow centerline to the distance measuring devices LS1 and LS2, respectively.

[0023] Furthermore, when the distances between two relative vertices and their corresponding ranging devices are unequal, a billet tilt warning is generated;

[0024] when or When this occurs, a warning of severe billet tilting will be generated.

[0025] The beneficial effects of this invention are as follows: This invention can effectively avoid the influence of external conditions on the positioning accuracy of the billet, and it eliminates the need to determine the length data of the billet cutting in advance. It can also effectively avoid the influence of slippage between the conveying roller and the billet on the positioning accuracy of the billet. It can detect and warn whether the billet tilts during the conveying process, thereby avoiding uneven loading in processes such as symmetrical casting and pushing steel off the line, and effectively ensuring the efficiency of continuous casting. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0027] Figure 1 This is a schematic diagram of the system structure of the present invention.

[0028] Figure 2 This is a flowchart illustrating the method of the present invention.

[0029] In the attached diagram, 1 represents the ranging device, 2 represents the conveying roller, and 3 represents the casting billet. Detailed Implementation

[0030] The present invention will be further described in detail below:

[0031] The present invention provides a billet stopping and length measuring system, characterized in that: it includes a roller conveyor system for transporting the billet and a distance measuring device for controlling the stopping position of the billet and measuring the length of the billet;

[0032] There are four ranging devices, which are respectively set at the four top corners of the roller conveyor frame. The four ranging devices are defined as LS1, LS2, LS3 and LS4.

[0033] The vertical projection of the intersection point of the line connecting distance measuring devices LS1 and LS3 with the line connecting distance measuring devices LS2 and LS4 coincides with the midpoint of the casting flow centerline of the roller conveyor system; for example... Figure 1 As shown, the roller conveyor system includes several conveyor rollers arranged in parallel with equal spacing between adjacent rollers. The conveyor roller corresponding to a predetermined position on the roller conveyor frame is designated as a weighing roller (generally, a weighing roller consists of multiple adjacent rollers forming a weighing roller conveyor, which is equipped with sensors for weighing). Each conveyor roller rotates around its own axis and has an identical structure, driven by a drive device, such as a motor. Alternatively, each conveyor roller may have an independent drive motor. The conveyor rollers are arranged in parallel with their axes in the same plane. The ranging device uses an existing laser rangefinder.

[0034] The line connecting distance measuring devices LS1 and LS3 is the same length as the line connecting distance measuring devices LS2 and LS4, wherein distance measuring devices LS1 and LS2 are located upstream in the billet conveying direction; for example Figure 1 As shown, the conveying direction is indicated by arrows. In this embodiment, the conveying direction is from left to right as shown in the figure.

[0035] It also includes a controller, which is used to receive the ranging information output by the four ranging devices, and output the billet length dimension and control the drive mechanism of the roller frame according to the ranging information. The controller is used to control the drive device of each conveying roller, such as start and stop, and also to generate corresponding early warning information, such as alarms for billet lateral deviation and excessive offset.

[0036] In this embodiment, the ranging devices LS1 and LS2 are located within the α angle range, and the ranging devices LS3 and LS4 are located within the α angle range;

[0037] in: ; Indicates the minimum width of the cast billet. This indicates the maximum length of the cast billet. This arrangement allows the measuring device to accurately obtain the length information of the cast billet and determine its stopping position. The minimum width and maximum length of the cast billet refer to the parameters in the billet's fixed length specification.

[0038] This invention is particularly applicable to rectangular castings. Moreover, the length of each casting cannot always remain consistent during the cutting process. This invention can achieve accurate length measurement and compare the set cutting length of the cutting equipment, thereby feeding back the measured length to the cutting equipment, which is beneficial for the cutting equipment to calibrate the cutting length.

[0039] Accordingly, the present invention also provides a method for controlling the stop and length measurement of a cast billet based on the above system, comprising the following steps:

[0040] S1. The angle between the line connecting ranging devices LS1 and LS3 and the line connecting ranging devices LS2 and LS4, marked as β;

[0041] S2. Obtain the distance between the two relative vertices of the billet and the corresponding measuring device during the conveying process of the billet in the roller conveyor system. When the distance between the two relative vertices and the corresponding measuring device is equal, the current billet is accurately positioned. For example, when t1 equals t3 or t2 equals t4, it indicates that the billet is accurately positioned.

[0042] S3. Determine the distances from the ranging devices LS1, LS2, LS3 and LS4 to the corresponding vertices of the billet as t1, t2, t3 and t4 respectively, and determine the length of the billet based on the distances t1, t2, t3 and t4 and the included angle β.

[0043] Specifically: In step S3, the length L of the cast billet is determined by the following method:

[0044] ;

[0045] Where D1 and D2 are the vertical distances from the center line of the casting flow centerline to the distance measuring devices LS1 and LS2, respectively.

[0046] In this embodiment, when the distances between two relative vertices and the corresponding ranging devices are not equal, a billet tilt warning is generated.

[0047] when or When this occurs, a severe billet tilt warning is generated. The value of λ can be set according to the actual working conditions, generally set to 20mm. This invention effectively avoids the influence of external conditions on the billet's positioning accuracy, eliminates the need to pre-determine the billet cutting length, and effectively prevents slippage between the conveyor rollers and the billet from affecting its positioning accuracy. It can detect and warn of whether the billet tilts during conveying, thereby avoiding uneven loading in processes such as symmetrical casting and pushing steel off the line, effectively ensuring continuous casting efficiency.

[0048] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A billet positioning and length measuring system, characterized in that: This includes a roller conveyor system for transporting billets and a distance measuring device for controlling the position of the billets and measuring their length. There are four ranging devices, which are respectively set at the four top corners of the roller conveyor frame. The four ranging devices are defined as LS1, LS2, LS3 and LS4. The vertical projection of the intersection of the line connecting the distance measuring devices LS1 and LS3 with the line connecting the distance measuring devices LS2 and LS4 coincides with the midpoint of the casting flow centerline of the roller conveyor system. The length of the line connecting the ranging devices LS1 and LS3 is equal to the length of the line connecting the ranging devices LS2 and LS4. Among them, the ranging devices LS1 and LS2 are located upstream of the billet conveying direction. It also includes a controller, which is used to receive the distance measurement information output by the four distance measuring devices, and output the billet length dimension and control the drive mechanism of the roller conveyor according to the distance measurement information.

2. The billet positioning and length measuring system according to claim 1, characterized in that: The ranging devices LS1 and LS2 are located within the α angle range, and the ranging devices LS3 and LS4 are located within the α angle range; in: ; Indicates the minimum width of the cast billet. This indicates the maximum length of the cast billet.

3. The billet positioning and length measuring system according to claim 1, characterized in that: The roller conveyor system includes several conveyor rollers, which are arranged in parallel with equal spacing between adjacent conveyor rollers. Among the several conveyor rollers, the conveyor roller corresponding to the set position of the roller conveyor frame is set as a weighing roller.

4. The billet positioning and length measuring system according to claim 1, characterized in that: The ranging device is a laser rangefinder.

5. A method for controlling the stopping and length measurement of a cast billet based on the system described in any one of claims 1-4, characterized in that: Includes the following steps: S1. The angle between the line connecting ranging devices LS1 and LS3 and the line connecting ranging devices LS2 and LS4, marked as β; S2. Obtain the distance between the two relative vertices of the billet and the corresponding measuring device during the conveying process of the billet in the roller conveyor system. When the distance between the two relative vertices and the corresponding measuring device is equal, the current billet is accurately positioned. S3. Determine the distances from the ranging devices LS1, LS2, LS3 and LS4 to the corresponding vertices of the billet as t1, t2, t3 and t4 respectively, and determine the length of the billet based on the distances t1, t2, t3 and t4 and the included angle β.

6. The billet stopping and length measurement control method according to claim 5, characterized in that: In step S3, the length L of the cast billet is determined using the following method: ； Where D1 and D2 are the vertical distances from the center line of the casting flow centerline to the distance measuring devices LS1 and LS2, respectively.

7. The billet stopping and length measurement control method according to claim 5, characterized in that: When the distances between two relative vertices and their corresponding ranging devices are not equal, a billet tilt warning is generated. when or When this occurs, a warning of severe billet tilting will be generated.

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