A Medium-Thick Slab Size Measurement and Verification System and Method

Abstract

The present invention discloses a medium-thick slab size measurement and verification system and method, which includes a roller table, a slab, a first laser length measurement sensor, a second laser length measurement sensor, a third laser length measurement sensor, a fourth laser length measurement sensor, a fifth laser length measurement sensor, a first grating sensor, a second grating sensor, a third grating sensor and a data processor. The thickness of the slab is obtained by judging the presence or absence of the signal of the grating sensor; the width and length of the slab are calculated through the measured values of the laser length sensors. The system of the present invention has high precision, low investment, convenient installation and low requirements for sensor protection, and can reduce the size quality problems of the finished steel plate caused by the size errors of the billets.

Description

Technical Field

[0001] The present invention belongs to the technical field of medium and heavy plate product quality control, and particularly relates to a system and method for measuring and verifying the dimensions of medium and heavy plate slabs. Background Art

[0002] Medium and heavy plates refer to steel plates with a thickness of 4.5 - 25.0 mm, which are mainly used in construction engineering, mechanical manufacturing, container manufacturing, shipbuilding, bridge construction, etc. They can also be used to manufacture various containers, furnace shells, furnace plates, bridges, and automotive static steel plates, low alloy steel plates, shipbuilding steel plates, boiler steel plates, pressure vessel steel plates, diamond plates, automotive girder steel plates, certain parts of tractors, and welded components, etc.

[0003] At present, after the billets in a medium and heavy plate plant are continuously cast into slab billets by the upstream continuous casting process, they are cut into fixed-length billets for rolling in a medium and heavy plate rolling mill by a flame cutter. The cutting accuracy of the fixed-length billet dimensions directly affects the dimensional control of the rolled finished steel plates. At present, before the fixed-length billets are rolled in the rolling mill, their dimensions are not measured and verified. It is difficult to analyze the quality problems of the finished steel plate dimensions caused by the fixed-length billet dimensions. Summary of the Invention

[0004] Technical problems to be solved: In view of the above technical problems, the present invention provides a system and method for measuring and verifying the dimensions of medium and heavy plate slabs, which can reduce the dimensional quality problems of the finished steel plates caused by billet dimension errors.

[0005] Technical solution: In a first aspect, the present invention provides a medium-thick slab size measurement and verification system, including a roller table, a slab, a first laser length measurement sensor, a second laser length measurement sensor, a third laser length measurement sensor, a fourth laser length measurement sensor, a fifth laser length measurement sensor, a first grating sensor, a second grating sensor, a third grating sensor, and a data processor. The first laser length measurement sensor and the third laser length measurement sensor are respectively arranged on both sides of the roller table. The lasers emitted by the first laser length measurement sensor and the third laser length measurement sensor are on the same straight line, both facing the roller table and perpendicular to the transportation direction of the roller table. The second laser length measurement sensor and the first laser length measurement sensor are on the same side of the roller table, and the laser emitted by the second laser length measurement sensor is parallel to the laser emitted by the first laser length measurement sensor. The fourth laser length measurement sensor and the fifth laser length measurement sensor are on the same side of the roller table as the third laser length measurement sensor, and the fourth laser length measurement sensor and the fifth laser length measurement sensor are respectively arranged on both sides of the third laser length measurement sensor. The included angle between the laser emitted by the fourth laser length measurement sensor and the transportation direction of the roller table is β1, and the included angle between the fifth laser length measurement sensor and the transportation direction of the roller table is β2. The first grating sensor, the second grating sensor, and the third grating sensor are arranged in sequence from bottom to top on one side of the roller table along a straight line perpendicular to the transportation direction of the roller table. The first laser length measurement sensor, the second laser length measurement sensor, the third laser length measurement sensor, the fourth laser length measurement sensor, the fifth laser length measurement sensor, the first grating sensor, the second grating sensor, and the third grating sensor are all connected to the data processor. The slab is arranged on the roller table, and laser holes are opened on the baffle of the roller table.

[0006] Preferably, the β 1 and β 2 are both greater than 0° and less than 90°.

[0007] Preferably, the distances from the first laser length measurement sensor, the second laser length measurement sensor, the third laser length measurement sensor, the fourth laser length measurement sensor, and the fifth laser length measurement sensor to the ground are all equal.

[0008] Preferably, the thickness of the slab measured by the first grating sensor is h 1 , the thickness of the slab measured by the second grating sensor is h 2 , the thickness of the slab measured by the third grating sensor is h 3 , and h 1 <h 2 <h 3 .

[0009] Second aspect, the present invention provides a method for measuring and verifying the size of medium-thick slab using the system described in the first aspect, including the following steps:

[0010] S1. Start the measurement and verification system, and determine whether there is a slab on the roller path in the measurement area, that is, determine whether the first grating sensor transmits a signal to the data processor. If the data processor does not receive the signal from the first grating sensor, it means there is no slab in the measurement area, and make a judgment again after an interval of time n 1 ; otherwise, it means there is a slab in the measurement area, and after an interval of time n 2 , record whether the first grating sensor, the second grating sensor, and the third grating sensor transmit signals to the data processor;

[0011] S2. When the data processor receives the signal from the first grating sensor in step S1, the first laser length measurement sensor, the second laser length measurement sensor, the third laser length measurement sensor, the fourth laser length measurement sensor, and the fifth laser length measurement sensor transmit the measurement values to the data processor, and calculate the width L 6 and length L 13 of the slab according to the formula

[0012] L 6 = (L 14 -L 1 -L 3 )×COSα 2 ,

[0013] L 13 = (L 9 -L 7 COSβ 1 -L 8 COSβ 2 ) ×COSα 3 ,

[0014] wherein, L 1 、L 2 、L 3 、L 7 、L 8 are the measurement values of the first laser length measurement sensor, the second laser length measurement sensor, the third laser length measurement sensor, the fourth laser length measurement sensor, and the fifth laser length measurement sensor at the same moment respectively, L 4 is the distance between the first laser length measurement sensor and the second laser length measurement sensor, L 14 is the distance between the first laser length measurement sensor and the third laser length measurement sensor, L 5 is the distance from the intersection point of the fourth laser length measurement sensor and the slab to the intersection point of the third laser length measurement sensor and the slab, that is, L5 = L 14 - L 1 - L 3 , L 9 is the distance between the fourth laser length measurement sensor and the fifth laser length measurement sensor, L 10 is the horizontal distance from the fourth laser length measurement sensor to the edge of the slab, L 11 is the distance from the intersection point of the fourth laser length measurement sensor and the slab to the intersection point of the fifth laser length measurement sensor and the slab, that is, L 11 = L 9 - L 10 - L 12 , L 12 is the horizontal distance from the fifth laser length measurement sensor to the edge of the slab, α 1 and α 3 are both the angles between the length direction of the slab and the conveying direction of the roller table, α 2 is the angle between the width direction of the slab and the direction perpendicular to the conveying direction of the roller table, and α 1 = α 2 = α 3 ;

[0015] S3. During a set time period, measure the same slab M times, and calculate the average value of the width L 6 of the slab and the average value of the length L 13 of the slab as the final width and length of the slab;

[0016] S4. Compare the final width and length of the slab 11 obtained in step S3 with the planned dimensions of the blank. When the deviation exceeds the threshold, the dimensions of the slab 11 are unqualified. Otherwise, the dimensions of the slab 11 are qualified and it enters the next process.

[0017] Preferably, in step S1, if the data processor receives the signal of the first grating sensor but does not receive the signals of the second grating sensor and the third grating sensor, the thickness of the slab is h 1 ; if the data processor receives the signals of the first grating sensor and the second grating sensor, the thickness of the slab is h 2 ; if the data processor receives the signals of the first grating sensor, the second grating sensor and the third grating sensor, the thickness of the slab is h 3 .

[0018] Beneficial effects: The system of the present invention determines the thickness of the slab by judging the presence or absence of the signals of the grating sensors, and calculates the width and length of the slab through the measured values of the laser length sensors. The system of the present invention has high precision, low investment, convenient installation, and low requirements for sensor protection, and can reduce the dimensional quality problems of the finished steel plate caused by the errors in the blank dimensions. Description of the Drawings

[0019] Figure 1 is a schematic diagram of the system structure of the present invention;

[0020] Figure 2 is a schematic diagram of the principle for the system of the present invention to measure and verify the thickness of a slab;

[0021] Figure 3 is a schematic diagram of the principle for the system of the present invention to measure and verify the length and width of a slab;

[0022] Figure 4 is a control flow chart of the system of the present invention;

[0023] Reference numerals in the figure: 1. First laser length measurement sensor, 2. Second laser length measurement sensor, 3. Third laser length measurement sensor, 4. Fourth laser length measurement sensor, 5. Fifth laser length measurement sensor, 6. First grating sensor, 7. Second grating sensor, 8. Third grating sensor, 9. Data processor, 10. Roller table, 11. Slab. Specific embodiments

[0024] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments:

[0025] Embodiment 1

[0026] As Figure 1 - Figure 2, A medium-thick slab size measurement and verification system, comprising a roller table 10, a slab 11, a first laser length measurement sensor 1, a second laser length measurement sensor 2, a third laser length measurement sensor 3, a fourth laser length measurement sensor 4, a fifth laser length measurement sensor 5, a first grating sensor 6, a second grating sensor 7, a third grating sensor 8, and a data processor 9. The first laser length measurement sensor 1 and the third laser length measurement sensor 3 are respectively arranged on both sides of the roller table 10. The lasers emitted by the first laser length measurement sensor 1 and the third laser length measurement sensor 3 are on the same straight line, both facing the roller table 10 and perpendicular to the roller table transportation direction. The second laser length measurement sensor 2 and the first laser length measurement sensor 1 are on the same side of the roller table 10, and the laser emitted by the second laser length measurement sensor 2 is parallel to the laser emitted by the first laser length measurement sensor 1. The fourth laser length measurement sensor 4 and the fifth laser length measurement sensor 5 and the third laser length measurement sensor 3 are on the same side of the roller table 10, and the fourth laser length measurement sensor 4 and the fifth laser length measurement sensor 5 are respectively arranged on both sides of the third laser length measurement sensor 3. The included angle between the laser emitted by the fourth laser length measurement sensor 4 and the roller table transportation direction is β1, and the included angle between the fifth laser length measurement sensor 5 and the roller table transportation direction is β2. The first grating sensor 6, the second grating sensor 7, and the third grating sensor 8 are sequentially arranged from bottom to top along a straight line perpendicular to the roller table transportation direction on one side of the roller table 10. The first laser length measurement sensor 1, the second laser length measurement sensor 2, the third laser length measurement sensor 3, the fourth laser length measurement sensor 4, the fifth laser length measurement sensor 5, the first grating sensor 6, the second grating sensor 7, and the third grating sensor 8 are all connected to the data processor 9. The slab 11 is arranged on the roller table 10, and laser holes are provided on the baffle of the roller table 10.

[0027] The above-mentioned β 1 and β 2 are both greater than 0° and less than 90°.

[0028] The distances from the above-mentioned first laser length measurement sensor 1, second laser length measurement sensor 2, third laser length measurement sensor 3, fourth laser length measurement sensor 4, and fifth laser length measurement sensor 5 to the ground are all equal.

[0029] The thickness of the slab 11 measured by the above-mentioned first grating sensor 6 is h 1 , the thickness of the slab 11 measured by the second grating sensor 7 is h 2 , the thickness of the slab 11 measured by the third grating sensor 8 is h 3 , and h 1 <h 2 <h 3 .

[0030] Example 2

[0031] As Figure 4 shown, a method for measuring and verifying the size of medium-thick slab billets includes the following steps:

[0032] S1. Start the measurement and verification system, and determine whether there is a slab billet 11 on the roller path 10 in the measurement area, that is, determine whether the first grating sensor 6 transmits a signal to the data processor 9. If the data processor 9 does not receive the signal from the first grating sensor 6, it means that there is no slab billet 11 in the measurement area, and it will be judged again after an interval time n1; otherwise, it means that there is a slab billet 11 in the measurement area. After an interval time n2, record whether the first grating sensor 6, the second grating sensor 7, and the third grating sensor 8 transmit signals to the data processor 9; if the data processor 9 receives the signal from the first grating sensor 6 but does not receive the signals from the second grating sensor 7 and the third grating sensor 8, the thickness of the slab billet 11 is h 1 ; if the data processor 9 receives the signals from the first grating sensor 6 and the second grating sensor 7, the thickness of the slab billet 11 is h 2 ; if the data processor 9 receives the signals from the first grating sensor 6, the second grating sensor 7, and the third grating sensor 8, the thickness of the slab billet 11 is h 3 ;

[0033] S2. When the data processor 9 in step S1 receives the signal from the first grating sensor 6, the first laser length measurement sensor 1, the second laser length measurement sensor 2, the third laser length measurement sensor 3, the fourth laser length measurement sensor 4, and the fifth laser length measurement sensor 5 transmit the measurement values to the data processor 9, and calculate the width L of the slab billet 11 according to the formula 6 and the length L 13 , as Figure 3 shown:

[0034] L 6 =L 5 ×COSα 2 = (L 14 -L 1 -L 3 )×COSα 2 ,

[0035] L 13 =L 11 ×COSα 3 =(L 9 -L 10 -L 12 )×COSα 3 = (L 9 -L 7 COSβ1 -L 8 COSβ 2 ) ×COSα 3 ,

[0036] Among them, L 1 、L 2 、L 3 、L 7 、L 8 are the measured values of the first laser length measurement sensor 1, the second laser length measurement sensor 2, the third laser length measurement sensor 3, the fourth laser length measurement sensor 4, and the fifth laser length measurement sensor 5 at the same moment respectively. L 4 is the distance between the first laser length measurement sensor 1 and the second laser length measurement sensor 2. L 14 is the distance between the first laser length measurement sensor 1 and the third laser length measurement sensor 3. L 5 is the distance from the intersection of the fourth laser length measurement sensor 1 and the slab 11 to the intersection of the third laser length measurement sensor 3 and the slab, that is, L 5 =L 14 -L 1 -L 3 ,L 9 is the distance between the fourth laser length measurement sensor 4 and the fifth laser length measurement sensor 5. L 10 is the horizontal distance from the fourth laser length measurement sensor 4 to the edge of the slab 11. L 11 is the distance from the intersection of the fourth laser length measurement sensor 4 and the slab 11 to the intersection of the fifth laser length measurement sensor 5 and the slab 11, that is, L 11 =L 9 -L 10 -L 12 ,L 12 is the horizontal distance from the fifth laser length measurement sensor 5 to the edge of the slab 11. α 1 and α 3 are both the angles between the length direction of the slab 11 and the roller table transportation direction. α 2 is the angle between the width direction of the slab 11 and the direction perpendicular to the roller table transportation direction, and α 1 =α 2 =α 3 =arctan(|L 1 -L 2 | / L 4 );

[0037] In the set time period, measure the same slab 11 M times, and calculate the average value of the width L 6 of the slab 11 and the length L 13Use the average value as the final width and length of the slab 11;

[0038] S4. Compare the final width and length of the slab 11 obtained in step S3 with the planned blank size. When the deviation exceeds the threshold, the size of the slab 11 is unqualified; otherwise, the size of the slab 11 is qualified and enters the next process.

[0039] Example 3

[0040] A 5m wide and thick plate production line, whose billets are provided by the steelmaking continuous casting process of the superior process. After the billets are flame cut, their specifications are: three thickness specifications of 220, 250, and 320mm; width range of 1300 - 2700mm; length range of 2600 - 4800mm. The system of the present invention is installed on the second group of the steel discharging roller table of its No. 1 heating furnace. The installation schematic diagram is shown in Figure 1 , since the measured temperature of the steel billet is greater than 1000°C, laser length measurement sensors are installed on both sides of the roller table, and openings are made on the baffle plates on both sides of the roller table to leave a measurement light channel for the sensors. At the same time, the roller table baffle plates can block the heat radiated by the steel billets. The running speed of the roller table is 1m / s, and the control program is designed as follows:

[0041] As Figure 4 shown, start the measurement verification system. The program determines whether the first grating sensor 6 has a signal. If there is no signal, it keeps judging. If there is, it is considered that the slab 11 is detected. Delay for n 2 = 0.5 seconds to remove the interference at the head of the slab (the delay time can be flexibly set according to the roller table speed). Set the counter M to zero, judge the states of the first grating sensor 6, the second grating sensor 7, and the third grating sensor 8, and calculate the current thickness value of the slab 11 according to its logical judgment principle; at the same time, record the measurement values of the 5 laser length measurement sensors, and calculate the length and width values of the slab 11 according to the measurement values; send the data of the length, width, and thickness measured this time to the database, then increment the counter M by 1, and judge whether the counter value is greater than the set number of times M (this value can be flexibly set according to needs). If it is less than M, perform the next measurement. If it is equal to or greater than M, judge whether the first grating sensor has a signal. If there is, continue to judge the state of the first grating sensor. If not, jump to before the start of the program.

[0042] The data processor 9 sends the size data of the current billet to the rolling mill MES system to compare and verify with the planned billet size data. When the set deviation is exceeded, automatically prohibit the rolling of the rolling mill according to the situation, and remind this information on the operator's computer screen. It is up to the operator to judge whether to perform rolling or send it back to the furnace for treatment.

[0043] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A medium-thick slab size measurement and verification system, characterized in that: it includes a roller table (10), a slab (11), a first laser length measurement sensor (1), a second laser length measurement sensor (2), a third laser length measurement sensor (3), a fourth laser length measurement sensor (4), a fifth laser length measurement sensor (5), a first grating sensor (6), a second grating sensor (7), a third grating sensor (8) and a data processor (9), the first laser length measurement sensor (1) and the third laser length measurement sensor (3) are respectively arranged on both sides of the roller table (10), the lasers emitted by the first laser length measurement sensor (1) and the third laser length measurement sensor (3) are on the same straight line, both facing the roller table (10) and perpendicular to the roller table transportation direction, the second laser length measurement sensor (2) and the first laser length measurement sensor (1) are on the same side of the roller table (10), and the laser emitted by the second laser length measurement sensor (2) is parallel to the laser emitted by the first laser length measurement sensor (1), the fourth laser length measurement sensor (4) and the fifth laser length measurement sensor (5) and the third laser length measurement sensor (3) are on the same side of the roller table (10), and the fourth laser length measurement sensor (4) and the fifth laser length measurement sensor (5) are respectively arranged on both sides of the third laser length measurement sensor (3), the included angle between the laser emitted by the fourth laser length measurement sensor (4) and the roller table transportation direction is β1, and the included angle between the fifth laser length measurement sensor (5) and the roller table transportation direction is β2, the first grating sensor (6), the second grating sensor (7) and the third grating sensor (8) are sequentially arranged from bottom to top on one side of the roller table (10) along a straight line perpendicular to the roller table transportation direction, the first laser length measurement sensor (1), the second laser length measurement sensor (2), the third laser length measurement sensor (3), the fourth laser length measurement sensor (4), the fifth laser length measurement sensor (5), the first grating sensor (6), the second grating sensor (7) and the third grating sensor (8) are all connected to the data processor (9), the slab (11) is arranged on the roller table (10), and laser holes are opened on the baffle of the roller table (10).

2. The medium-thick slab size measurement and verification system according to claim 1, characterized in that: The said β 1 and β 2 are both greater than 0° and less than 90°.

3. The medium-thick slab size measurement and verification system according to claim 1, characterized in that: the distances from the first laser length measurement sensor (1), the second laser length measurement sensor (2), the third laser length measurement sensor (3), the fourth laser length measurement sensor (4) and the fifth laser length measurement sensor (5) to the ground are all equal.

4. The medium-thick slab size measurement and verification system according to claim 1, characterized in that: The thickness of the slab (11) measured by the first grating sensor (6) is h 1 , the thickness of the slab (11) measured by the second grating sensor (7) is h 2 , the thickness of the slab (11) measured by the third grating sensor (8) is h 3 , and h 1 < h 2 < h 3 .

5. A method for medium-thick slab size measurement and verification using the system according to any one of claims 1 to 4, characterized in that, it includes the following steps: S1. Start the measurement and verification system, and determine whether there is a slab (11) on the roller table (10) in the measurement area, that is, determine whether the first grating sensor (6) transmits a signal to the data processor (9). If the data processor (9) does not receive the signal from the first grating sensor (6), it means that there is no slab (11) in the measurement area, and then make a judgment again after an interval of time n 1 Otherwise, it means that there is a slab (11) in the measurement area, and record whether the first grating sensor (6), the second grating sensor (7) and the third grating sensor (8) transmit signals to the data processor (9) after an interval of time n 2 ​ S2. When the data processor (9) receives the signal from the first grating sensor (6) in step S1, the first laser length measurement sensor (1), the second laser length measurement sensor (2), the third laser length measurement sensor (3), the fourth laser length measurement sensor (4), and the fifth laser length measurement sensor (5) transmit the measured values to the data processor (9), and calculate the width L and the length L of the slab (11) according to the formula 6 and length L 13 , L 6 = (L 14 -L 1 -L 3 )×COSα 2 , L 13 = (L 9 -L 7 COSβ 1 -L 8 COSβ 2 ) ×COSα 3 , Among them, L 1 、L 2 、L 3 、L 7 、L 8 are the measured values of the first laser length measurement sensor (1), the second laser length measurement sensor (2), the third laser length measurement sensor (3), the fourth laser length measurement sensor (4) and the fifth laser length measurement sensor (5) at the same moment, L 4 is the distance between the first laser length measurement sensor (1) and the second laser length measurement sensor (2), L 14 is the distance between the first laser length measurement sensor (1) and the third laser length measurement sensor (3), L 5 is the distance from the intersection of the first laser length measurement sensor (1) and the slab (11) to the intersection of the third laser length measurement sensor (3) and the slab (11), that is, L 5 =L 14 -L 1 -L 3 , L 9 is the distance between the fourth laser length measurement sensor (4) and the fifth laser length measurement sensor (5), L 10 is the horizontal distance from the fourth laser length measurement sensor (4) to the edge of the slab (11), L 11 is the distance from the intersection of the fourth laser length measurement sensor (4) and the slab (11) to the intersection of the fifth laser length measurement sensor (5) and the slab (11), that is, L 11 =L 9 -L 10 -L 12 , L 12 is the horizontal distance from the fifth laser length measurement sensor (5) to the edge of the slab (11), α 1 and α 3 are both the angles between the length direction of the slab (11) and the roller table transportation direction, α 2 is the angle between the width direction of the slab (11) and the direction perpendicular to the roller table transportation direction, and α 1 =α 2 =α 3 ; S3. During a set time period, perform M measurements on the same slab (11), and calculate the average value of the width L 6 of the slab (11) and the average value of the length L 13 as the final width and length of the slab (11); S4. Compare the final width and length of the slab (11) obtained in step S3 with the planned blank size. When the deviation exceeds the threshold, the size of the slab (11) is unqualified; otherwise, the size of the slab (11) is qualified and it enters the next process.

6. According to the method described in claim 5, it is characterized in that: In step S1, if the data processor (9) receives the signal from the first grating sensor (6) but does not receive the signals from the second grating sensor (7) and the third grating sensor (8), the thickness of the slab (11) is h 1 ; if the data processor (9) receives the signals from the first grating sensor (6) and the second grating sensor (7), the thickness of the slab (11) is h 2 ; if the data processor (9) receives the signals from the first grating sensor (6), the second grating sensor (7) and the third grating sensor (8), the thickness of the slab (11) is h 3 .

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