A system and method for preventing material mixing during automatic belt feeding in steelmaking

Abstract

The present invention relates to a system and method for preventing material mixing during automatic belt feeding of steelmaking, belonging to the technical field of steelmaking. The technical solution is as follows: when materials enter a high-level silo (16) from an underground silo (2) through a belt scale A (3), a No. 1 belt (4), a No. 2 belt (6), a No. 3 belt (7), a No. 4 belt (8), a belt scale B (9) and a discharge trolley (14), the belt scale A (3) and the belt scale B (9) weigh the mass of the materials passing through, and a feeding PLC (1) compares and calculates the two. When the mass data of the materials weighed by the belt scales A and B differ by more than 10%, an alarm is issued and the machine is automatically shut down, thereby preventing material mixing during automatic feeding. The beneficial effects of the present invention are: low investment cost, strong anti-interference ability, and the function of detecting material mixing phenomena in each process during the automatic feeding process and taking corresponding measures to avoid material mixing in the high-level silo.

Description

Technical Field

[0001] The invention relates to a system and method for preventing material mixing by automatic belt feeding in steelmaking, belonging to the technical field of steelmaking. Background Art

[0002] In steelmaking production, mixing often occurs due to operator error or equipment failure. The mixing of materials with different compositions may cause the molten steel to have unqualified composition or splashing during the blowing process. In addition, dealing with mixing problems usually requires downtime or additional time and labor, resulting in reduced production efficiency. Whether mixing can be effectively avoided is related to whether the entire automatic feeding system can operate normally. At present, there are existing automatic silo feeding methods, such as Chinese patents CN202121673921.6 "A steelmaking feeding belt screening device" and CN201410140458.7 "A steelmaking auxiliary raw material feeding system automatic control method". The problem is that each process lacks countermeasures for mixing. If effective measures cannot be taken in the first time when mixing occurs, the smooth operation of the converter production will be seriously affected, the molten steel composition will be unqualified in the converter smelting, and splashing safety accidents will occur in the smelting process. Summary of the Invention

[0003] The purpose of the present invention is to provide a system and method for preventing material mixing in automatic belt feeding of steelmaking, which has low investment cost and strong anti-interference ability. It can meet the function of detecting material mixing phenomena in various processes during automatic feeding and taking corresponding measures to avoid material mixing in high-level silos.

[0004] The technical solution of the present invention is:

[0005] A steelmaking automatic belt feeding and mixing prevention system includes a feeding PLC, an underground silo, a belt scale A, a No. 1 belt, a camera A, a No. 2 belt, a No. 3 belt, a No. 4 belt, a belt scale B, a camera B, materials, a laser rangefinder A, an encoder for measurement and positioning, a discharge trolley, a material flow switch, and a high-level silo. The underground silo is provided with a belt scale A, and a camera A is provided above the belt scale A. The belt scale A, the No. 1 belt, the No. 2 belt, the No. 3 belt, and the No. 4 belt are connected in sequence, and the No. 4 belt is located above the high-level silo. The No. 4 belt is equipped with a belt scale B and matched with a discharge trolley and an encoder for measurement and positioning. The discharge trolley discharges materials to the high-level silo through the material flow switch, and the encoder measurement and positioning is used for material positioning; a camera B is provided above the belt scale B, and a laser rangefinder A is provided on the side; the belt scale A, No. 1 belt, camera A, No. 2 belt, No. 3 belt, No. 4 belt, belt scale B, camera B, laser rangefinder A, encoder measurement and positioning, discharge trolley and material flow switch are all connected to the feeding PLC and are controlled by the feeding PLC.

[0006] Furthermore, the No. 1 belt lifts the material in the underground silo to the ground, the No. 2 belt transports the material on the ground, the No. 3 belt lifts the material above the high-level silo, and the No. 4 belt cooperates with the unloading trolley to unload the material into the high-level silo.

[0007] A method for preventing material mixing during automatic belt feeding in steelmaking is disclosed. The method utilizes the aforementioned system for preventing material mixing during automatic belt feeding in steelmaking. When material enters a high-level silo from an underground silo through a belt scale A, a No. 1 belt, a No. 2 belt, a No. 3 belt, a No. 4 belt, a belt scale B, and a discharge trolley, the belt scales A and B weigh the mass of the material passing through, and a loading programmable logic controller (PLC) performs a comparison and calculation. When the mass data of the material passed by the belt scales A and B differ by more than 10%, an alarm is triggered and the machine automatically shuts down, thereby preventing material mixing during automatic feeding.

[0008] The specific steps are as follows: When transporting materials in the underground silo, measure the load capacity per meter of the belt using belt scale A. And record it in the system's DB block, and count the total weight of this loading When the material moves to the belt scale B in front of the unloading trolley, the load capacity per meter of the belt is measured by the belt scale B. And record it in the system's DB block, and count the total weight of this loading Based on the belt's running speed and running time, when the system determines that the belt segment weighed by belt scale A reaches belt scale B, the system calculates the mass ratio k of the material on this belt segment after it passes through belt scale A and belt scale B. After loading is completed, the system calculates the total mass ratio K of this batch of materials after it passes through belt scale A and belt scale B.

[0009] The formula for calculating the mass ratio of two belt scales is:

[0010] ;

[0011] The formula for calculating the total mass ratio of the two belt scales is:

[0012] ;

[0013] When the mass ratio k of the materials weighed by belt scale A and belt scale B is greater than 110% or less than 90%, an alarm will be issued and the machine will automatically shut down; when the loading is completed, the system will check the total loading amount. When the mass ratio K of the materials weighed by belt scale A and belt scale B is greater than 110% or less than 90%, an alarm will be issued and the machine will automatically shut down.

[0014] Furthermore, the steelmaking automatic belt loading system to prevent mixing has a material tracking function. When the underground hopper feeds materials to belt No. 1, belt No. 2, belt No. 3 and belt No. 4, the loading PLC calculates the theoretical position of the material based on the movement speed and unloading time of belt No. 1, belt No. 2, belt No. 3 and belt No. 4.

[0015] Furthermore, the steelmaking automatic belt feeding and mixing prevention system has a visual detection function, and makes judgments based on the recognition results of camera A and camera B; camera A is installed on the No. 1 belt behind the belt scale A, and recognizes in real time whether there is material passing through the current position, and compares it with the calculation result of the loading PLC. When the two judgment results are inconsistent, the system automatically alarms; camera B is installed on the No. 4 belt behind the belt scale B, and recognizes in real time whether there is material passing through the current position. When the loading PLC and camera B both determine that there is material at this position, the unloading trolley starts to feed material into the high-level silo; when it is determined that there is no material, the feeding is stopped; when the judgment results are inconsistent, the system alarms and continues the feeding action. Specific steps: After the underground silo finishes feeding the material to the No. 1 belt, the theoretical position of the material here obtained by the loading PLC is compared with the material position identified by camera A. When the two judgment results are inconsistent, the system automatically alarms; when the material reaches the position of camera B above the No. 4 belt, the loading PLC determines that there is material at the theoretical position of the material here, and at the same time, when camera B recognizes that there is material at this position, the unloading trolley starts to feed the material into the high-level silo; if the loading PLC and camera B both determine that there is no material, the feeding is stopped; when the judgment results of the loading PLC and camera B are inconsistent, the system alarms and continues the feeding action.

[0016] Furthermore, the steelmaking automatic belt loading and mixing prevention system detects the material name, set silo number, and actual silo number of the unloading trolley in real time based on the material tracking function, and displays them on the operation screen. When the set silo number is inconsistent with the actual silo number, the system alarms and issues a command to make the belt stop urgently.

[0017] Furthermore, the unloading trolley is provided with a positioning device, which is measured and positioned by a laser rangefinder and an encoder. The laser rangefinder is installed on the rear side of the unloading trolley's moving track, and measures the distance between the unloading trolley and the laser rangefinder in real time, and sends it to the loading PLC; the encoder measurement and positioning is connected to the unloading trolley, and measures the motion state of the unloading trolley in real time, converts it into current position information, and sends it to the loading PLC; the loading PLC receives the signals measured and positioned by the laser rangefinder and the encoder and calculates the current position of the unloading trolley. When the difference between the encoder measurement positioning and the unloading trolley position calibrated by the laser rangefinder is greater than 0.1 meter, an alarm is triggered. When the unloading trolley is not in the high-level silo corresponding to the unloaded material, an alarm is triggered.

[0018] Furthermore, the unloading trolley is equipped with a material flow switch. When the material flow switch detects that material is passing through, an animation of the material entering the high-level silo is displayed on the human-computer interaction interface. When the material flow switch is triggered and the material tracking calculates that the theoretical position of the material has not reached the position of the unloading trolley, the system alarms.

[0019] The beneficial effects of the present invention are: low investment cost, strong anti-interference ability, and the function of detecting mixing phenomena in various processes during automatic feeding and taking corresponding measures to avoid mixing in high-level silos. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a system diagram of an embodiment of the present invention;

[0021] Figure 2 This is a flow chart of an embodiment of the present invention;

[0022] In the figure: loading PLC1, underground silo 2, belt scale A3, No. 1 belt 4, camera A5, No. 2 belt 6, No. 3 belt 7, No. 4 belt 8, belt scale B9, camera B10, material 11, laser rangefinder A12, encoder measurement and positioning 13, unloading trolley 14, material flow switch 15, high-level silo 16. Implementation Method

[0023] The present invention will be further described below with reference to the accompanying drawings and through examples.

[0024] A steelmaking automatic belt feeding and mixing prevention system includes a feeding PLC1, an underground silo 2, a belt scale A3, a No. 1 belt 4, a camera A5, a No. 2 belt 6, a No. 3 belt 7, a No. 4 belt 8, a belt scale B9, a camera B10, a material 11, a laser rangefinder A12, an encoder measurement and positioning 13, a discharge trolley 14, a material flow switch 15 and a high-level silo 16. The underground silo 2 is provided with a belt scale A3, a camera A5 is provided above the belt scale A3, the belt scale A3, the No. 1 belt 4, the No. 2 belt 6, the No. 3 belt 7 and the No. 4 belt 8 are connected in sequence, the No. 4 belt 8 is located above the high-level silo 16, and the No. 4 belt 8 is located above the high-level silo 16. Belt No. 8 is provided with a belt scale B9 and matched with a discharge trolley 14 and an encoder measurement and positioning 13. The discharge trolley 14 discharges materials to the high-level silo 16 through the material flow switch 15, and the encoder measurement and positioning 13 is used for material positioning; a camera B10 is provided above the belt scale B9, and a laser rangefinder A12 is provided on the side; the belt scale A3, belt No. 1 4, camera A5, belt No. 2 6, belt No. 3 7, belt No. 4 8, belt scale B9, camera B10, laser rangefinder A12, encoder measurement and positioning 13, discharge trolley 14 and material flow switch 15 are all connected to the loading PLC1 and are controlled by the loading PLC1.

[0025] The No. 1 belt 4 lifts the material 11 in the underground silo 2 to the ground, the No. 2 belt 6 transports the material on the ground, the No. 3 belt 7 lifts the material above the high-level silo 16, and the No. 4 belt 8 cooperates with the unloading trolley 14 to unload the material into the high-level silo 16.

[0026] A method for preventing material mixing during automatic belt feeding for steelmaking is disclosed. The method utilizes the aforementioned system for preventing material mixing during automatic belt feeding for steelmaking. When material enters a high-level silo 16 from an underground silo 2 through a belt scale A3, a No. 1 belt 4, a No. 2 belt 6, a No. 3 belt 7, a No. 4 belt 8, a belt scale B9, and a discharge trolley 14, belt scales A3 and B9 weigh the mass of the material passing through, and a loading program logic circuit (PLC) 1 compares and calculates the two. When the mass data of the material passed by the belt scales A and B differ by more than 10%, an alarm is issued and the machine automatically shuts down, thereby preventing material mixing during automatic feeding.

[0027] In implementation, the present invention first solves the problem of mixing materials during belt transportation: when the mass ratio k of the materials weighed by the belt scale A and the belt scale B is greater than 110% or less than 90%, an alarm is issued and the machine automatically stops; when the loading is completed, the system checks the total loading amount. When the mass ratio K of the materials weighed by the belt scale A and the belt scale B is greater than 110% or less than 90%, an alarm is issued and the machine automatically stops.

[0028] Then, the present invention solves the problem of material mixing during the unloading process of the unloading vehicle: the distance between the unloading vehicle and the two laser rangefinders is measured in real time, and an alarm is issued when the unloading vehicle is not in the silo corresponding to the unloaded material.

[0029] Take the example of feeding materials from 1# underground dry grinding steel silo and 2# underground sinter ore silo to 1-1# high-level dry grinding steel silo and 1-2# high-level sinter ore silo:

[0030] First, the 1# underground dry-grinding steel silo delivers dry-grinding steel to the conveyor belt. After the 1# underground dry-grinding steel silo stops delivering steel, the 2# underground sinter silo begins delivering sinter ore. Assume that the interval between the 1# underground dry-grinding steel silo stopping and the 2# underground sinter silo starting delivering sinter ore is too short, causing the tail of the dry-grinding steel stream to mix with the head of the sinter ore stream during the conveyor belt transportation.

[0031] When the 1# underground dry-grinded steel silo is conveying dry-grinded steel to the belt, the load capacity per meter of the belt is measured by belt scale A. And record it in the DB block, and count the total weight of this loading When the dry-ground steel moves to the belt scale B at the front of the transport vehicle, the belt scale B measures the load per meter of the belt. And record it in the DB block, and count the total weight of this loading Based on the belt's running speed and running time, when the system determines that the belt segment weighed by belt scale A reaches belt scale B, the system calculates the mass ratio k of the dry-ground steel on this belt segment after it passes through belt scales A and B. After loading is completed, the system calculates the total mass ratio K of this batch of dry-ground steel after it passes through belt scales A and B.

[0032] The formula for calculating the mass ratio of two belt scales is:

[0033] ;

[0034] The formula for calculating the total mass ratio of the two belt scales is:

[0035] ;

[0036] Since the tail of the dry-grinded steel material flow is mixed with the sintered ore material flow during the belt transportation process, the dry-grinded steel material flow is measured when it passes through the belt scale A. and This is normal data, but when the material flows through the belt weighing B, the tail of the material flow Will increase abnormally, the total mass of dry grinding steel As a result, k and K increase. To prevent this mixed material from entering the high-level silo and affecting production quality, an alarm is set and the machine automatically shuts down when the mass ratio k of the materials weighed by belt scales A and B is greater than 110% or less than 90%. After loading is completed, the system checks the total loading amount. If the mass ratio K of the materials weighed by belt scales A and B is greater than 110% or less than 90%, an alarm is set and the machine automatically shuts down.

[0037] Assume that when the 1# underground dry-grinding steel silo and the 2# underground sintered ore silo are conveying materials to the belt, the tail of the dry-grinding steel flow and the head of the sintered ore flow are mixed before passing through camera A. When the loading PLC determines that the tail of the dry-grinding steel flow conveyed by the 1# underground dry-grinding steel silo has passed the position of camera A, due to the mixing of materials, the image received by camera A shows that there is still material flow passing. At this time, the recognition result of camera A is inconsistent with the judgment result of PLC, and the system automatically alarms.

[0038] Assume that when the 1# underground dry-grinding steel silo and the 2# underground sintered ore silo are conveying materials to the belt, the tail of the dry-grinding steel flow and the head of the sintered ore flow are mixed during the belt transportation. When the loading PLC determines that the tail of the dry-grinding steel flow conveyed by the 1# underground dry-grinding steel silo has passed the position of camera B, due to the mixing of materials, the image received by camera B shows that there is still material flow passing. At this time, the recognition result of camera B is inconsistent with the judgment result of PLC, and the system automatically alarms.

[0039] like Figure 2 As shown, the process of the steelmaking automatic belt feeding and preventing mixing method provided by this application is as follows:

[0040] After the underground silo starts unloading materials onto the belt, the materials move to the position of belt scale A. Belt scale A starts to weigh the passing materials. At the same time, camera A identifies whether there is material passing through the belt at the rear end of belt scale A. The camera identification result is compared with the theoretical position of the material calculated by the PLC through material tracking. When the camera and PLC have inconsistent judgment results on whether there is material passing through this position, the system alarms.

[0041] After a while, the material moves to belt scale B. The PLC calculates whether the weights of the materials on scales A and B deviate significantly. If the deviation is greater than 10%, an alarm is triggered and the belt is brought to an emergency stop. If it is less than 10%, the system is deemed normal. Camera B then detects whether material has passed the belt behind scale B. The camera's recognition result is compared with the theoretical material position calculated by the PLC through material tracking. If the camera and PLC disagree on whether material has passed at this position, the unloading trolley continues feeding and the system alarms. If both determine that material is present, the unloading trolley continues feeding; if both determine that no material is present, the unloading trolley stops feeding.

[0042] When the unloading trolley is delivering materials, it checks in real time whether the material currently loaded matches the material in the silo it is arriving at. If the types are inconsistent, the system will alarm and cause the conveyor to stop suddenly. If the types are consistent, the feeding operation will continue, and the position of the unloading trolley will be determined in real time by measuring and positioning with a laser rangefinder and an encoder. An alarm will be triggered if the difference between the encoder's position and the calibrated position of the unloading trolley by the laser rangefinder is greater than 0.1 meters. An alarm will also be triggered if any device determines that the unloading trolley is not in the silo corresponding to the material being unloaded.

[0043] When the material moves to the unloading trolley position, the material flow switch will be triggered. When the material flow switch detects that material has passed, the animation of the material entering the high-level silo will be displayed on the human-computer interaction interface. When the material flow switch is triggered and the material tracking calculates that the theoretical position of the material has not reached the unloading trolley position, the system will alarm.

Claims

1. A method for preventing material mixing during automatic belt feeding of steelmaking, which is carried out by using a system for preventing material mixing during automatic belt feeding of steelmaking. The system comprises a feeding PLC (1), an underground silo (2), a belt scale A (3), a No. 1 belt (4), a camera A (5), a No. 2 belt (6), a No. 3 belt (7), a No. 4 belt (8), a belt scale B (9), a camera B (10), material (11), a laser rangefinder A (12), an encoder measurement and positioning (13), a discharge trolley (14), a material flow switch (15) and a high-level silo (16). The underground silo (2) is provided with a belt scale A (3), a camera A (5) is provided above the belt scale A (3), and the belt scale A (3), the No. 1 belt (4), the No. 2 belt (6), the No. 3 belt (7) and the No. 4 belt (8) are connected in sequence. The fourth belt (8) is located above the high-level silo (16). The fourth belt (8) is provided with a belt scale B (9) and matched with a discharge trolley (14) and an encoder measurement and positioning (13). The discharge trolley (14) discharges the material to the high-level silo (16) through the material flow switch (15). The encoder measurement and positioning (13) is used to position the material (11); a camera B (10) is provided above the belt scale B (9), and a laser rangefinder A (12) is provided on the side; the belt scale A (3), the first belt (4), the camera A (5), the second belt (6), the third belt (7), the fourth belt (8), the belt scale B (9), the camera B (10), the laser rangefinder A (12), the encoder measurement and positioning (13), the discharge trolley (14) and the material flow switch (15) are all connected to the feeding PLC (1) and are controlled by the feeding PLC (1); Its characteristics are: When the material (11) enters the high-level silo (16) from the underground silo (2) through the belt scale A (3), the No. 1 belt (4), the No. 2 belt (6), the No. 3 belt (7), the No. 4 belt (8), the belt scale B (9) and the unloading trolley (14), the belt scale A (3) and the belt scale B (9) weigh the mass of the material (11) passing through, and the loading PLC (1) compares and calculates the two. When the mass data of the material (11) weighed by the belt scale A (3) and the belt scale B (9) differ by more than 10%, an alarm is issued and the machine is automatically shut down to prevent mixing of materials during automatic loading; When the underground silo (2) transports the material (11), the belt load per meter is measured by the belt scale A. And record it in the system's DB block, and count the total weight of this loading When the material (11) moves to the belt scale B (9) at the front of the unloading trolley, the load per meter of the belt is measured by the belt scale B. And record it in the system's DB block, and count the total weight of this loading ; Based on the belt running speed and running time, when the system determines that the belt section weighed by the belt scale A (3) reaches the belt scale B (9), the system calculates the mass ratio k of the material (11) on this belt section passing through the belt scale A (3) and the belt scale B (9); after the loading is completed, the system calculates the total mass ratio K of this batch of materials (11) passing through the belt scale A (3) and the belt scale B (9); The formula for calculating the mass ratio of two belt scales is: ; The formula for calculating the total mass ratio of the two belt scales is: ; When the mass ratio k of the material (11) passed by the belt scale A (3) and the belt scale B (9) is greater than 110% or less than 90%, an alarm is triggered and the machine automatically stops; when the loading is completed, the system checks the total loading amount. When the mass ratio K of the material (11) passed by the belt scale A (3) and the belt scale B (9) is greater than 110% or less than 90%, an alarm is triggered and the machine automatically stops.

2. The method for preventing material mixing during automatic belt feeding of steelmaking according to claim 1, wherein: The No. 1 belt (4) lifts the material (11) in the underground silo (2) to the ground, the No. 2 belt (6) transports the material (11) on the ground, the No. 3 belt (7) lifts the material (11) to the top of the high-level silo (16), and the No. 4 belt (8) cooperates with the unloading trolley (14) to unload the material into the high-level silo (16).

3. The method for preventing material mixing during automatic belt feeding of steelmaking according to claim 1, characterized in that: The steelmaking automatic belt feeding system for preventing material mixing has a material tracking function. When the underground material bin (2) feeds materials to the No. 1 belt (4), the No. 2 belt (6), the No. 3 belt (7) and the No. 4 belt (8), the feeding PLC (1) calculates the theoretical position of the materials according to the movement speed and unloading time of the No. 1 belt (4), the No. 2 belt (6), the No. 3 belt (7) and the No. 4 belt (8).

4. The method for preventing material mixing during automatic belt feeding of steelmaking according to claim 3, wherein: The steelmaking automatic belt feeding and mixing prevention system has a visual detection function, and makes judgments based on the recognition results of camera A (5) and camera B (10); camera A (5) is installed on the No. 1 belt behind the belt scale A (3), and recognizes in real time whether material (11) passes through the current position, and compares it with the calculation result of the feeding PLC (1). When the judgment results of the two are inconsistent, the system automatically alarms; camera B (10) is installed on the No. 4 belt behind the belt scale B (9), and recognizes in real time whether material (11) passes through the current position. When the feeding PLC (1) and camera B (10) both determine that there is material at this position, the unloading trolley starts to feed the material into the high-level silo (16); when it is determined that there is no material, the feeding is stopped; when the judgment results are inconsistent, the system alarms and continues the feeding action.

5. The method for preventing material mixing during automatic belt feeding of steelmaking according to claim 3, characterized in that: The steelmaking automatic belt loading and mixing prevention system detects the material name, set silo number and actual silo number of the unloading trolley in real time based on the material tracking function, and displays them on the operation screen. When the set silo number is inconsistent with the actual silo number, the system alarms and issues a command to make the belt stop urgently.

6. The method for preventing material mixing during automatic belt feeding of steelmaking according to claim 1, characterized in that: The unloading trolley (14) is provided with a positioning device, which is measured and positioned by a laser rangefinder A (12) and an encoder (13). The laser rangefinder A (12) is installed on the rear side of the unloading trolley (14) motion track, and measures the distance between the unloading trolley (14) and the laser rangefinder A (12) in real time, and sends it to the loading PLC (1); the encoder (13) is connected to the unloading trolley (14), and measures the motion state of the unloading trolley (14) in real time, converts it into current position information, and sends it to the loading PLC (1); the loading PLC (1) receives the signals of the laser rangefinder A (12) and the encoder (13) and calculates the current position of the unloading trolley (14). When the difference between the encoder (13) and the position of the unloading trolley calibrated by the laser rangefinder A (12) is greater than 0.1 meters, an alarm is triggered. When the unloading trolley (14) is not in the high-level silo (16) corresponding to the unloaded material, an alarm is triggered.

7. The method for preventing material mixing during automatic belt feeding of steelmaking according to claim 1, characterized in that: The unloading trolley (14) is provided with a material flow switch (15). When the material flow switch (15) detects that material has passed through, an animation of the material (11) entering the high-level silo (16) is displayed on the human-machine interface. When the material flow switch (15) is triggered and the material tracking calculates that the theoretical position of the material has not reached the position of the unloading trolley, the system alarms.

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