Device and method for detecting misalignment of a billet at the door of a heating furnace

Abstract

The application discloses a device for detecting blank deviation at a heating furnace door, comprising a first distance measuring mechanism for obtaining a first distance value of the blank and a second distance measuring mechanism for obtaining a second distance value of the blank, the first distance measuring mechanism and the second distance measuring mechanism being connected with a control system, the control system comprising a judging unit configured to judge whether the blank deviates according to the difference between the first distance value and the second distance value. The device for detecting blank deviation at a heating furnace door does not need to be directly installed on the furnace body, has a better temperature environment, is stable in work, can timely find the deviated blank, notify the operator to intervene, avoid misoperation under automatic operation, and improve work efficiency. The application discloses a method for detecting blank deviation at a heating furnace door.

Description

Technical Field

[0001] This invention belongs to the technical field of continuous heating furnaces in the metallurgical industry. Specifically, this invention relates to a device and method for detecting billet deviation at the entrance of a heating furnace. Background Technology

[0002] Currently, continuous heating furnaces with end-in and end-out operation in steel rolling mills are gradually transitioning to automatic billet loading and unloading. While personnel in this position may be part-time workers from other roles, due to equipment and raw material constraints, billet deviation during loading or unloading still occurs. Operators may not be able to detect and intervene in time, leading to accidents such as... Figure 7 The situation shown can lead to prolonged production stoppages in severe cases.

[0003] For example, patent document CN202734585U discloses a pulse combustion furnace pressure control device, belonging to the technical field of pulse combustion control equipment. It is used to control the furnace pressure of an industrial furnace employing pulse combustion technology. A burner controller is installed next to the burner, a temperature control thermocouple is installed on the furnace body, a furnace pressure tapping device is installed on the furnace body, the input terminal of a differential pressure transmitter is connected to the furnace pressure tapping device, and a flue gas thermocouple is installed inside the flue. The output terminals of the burner controller, temperature control thermocouple, and flue gas thermocouple are connected to a programmable logic controller (PLC). The output terminal of the PLC is connected to a flue valve controller, and the flue valve controller is connected to the flue valve. The flue opening is calculated based on the parameters output in real time by the combustion control system, and the flue valve action is quickly controlled to promptly control furnace pressure fluctuations. The furnace pressure stability of the pulse combustion cycle is greatly improved. Throughout the entire heating or heat treatment cycle, the furnace pressure remains basically stable between 0-20 Pa with very small fluctuations, improving overall process performance and furnace temperature uniformity, reducing energy consumption, and extending the service life of the furnace lining.

[0004] From the moment the billet enters the furnace, its width positioning within the furnace is recorded until it exits. Under normal circumstances, the billet's width direction is perpendicular to the running direction. If an accident occurs and deflection occurs, the angle between the billet's width axis and the running direction will no longer be perpendicular. When this angle exceeds a certain degree, a dangerous situation arises, making automatic unloading difficult and requiring timely manual intervention. However, current technology lacks a means to monitor billet deviation at the furnace head during the automatic unloading process of a continuous heating furnace with end-to-end inlet and outlet, thus failing to promptly alert operators for intervention. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention provides a device for detecting billet deviation at the furnace door, with the purpose of ensuring timely detection of misaligned billets, notifying operators to intervene, and avoiding malfunctions during automatic operation.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a device for detecting billet deviation at the entrance of a heating furnace, comprising a first measuring mechanism for acquiring a first distance value of the billet and a second measuring mechanism for acquiring a second distance value of the billet, wherein the first measuring mechanism and the second measuring mechanism are connected to a control system, and the control system includes a judgment unit, wherein the judgment unit is configured to determine whether the billet has deviated based on the difference between the first distance value and the second distance value.

[0007] The first ranging mechanism and / or the second ranging mechanism are movable.

[0008] The first ranging mechanism and / or the second ranging mechanism are connected to the driving mechanism, which includes a driving motor and a power transmission mechanism connected to the driving motor.

[0009] The power transmission mechanism includes a traction steel cable, a first fixed pulley group and a second fixed pulley group. The first fixed pulley group is connected to the drive motor. The traction steel cable passes around the first fixed pulley group and the second fixed pulley group. The traction steel cable is connected to the first ranging mechanism and / or the second ranging mechanism.

[0010] Both the first and second fixed pulley groups consist of three fixed pulleys, with the heights of the three fixed pulleys being set differently.

[0011] The first ranging mechanism includes a ranging trolley and a laser rangefinder mounted on the ranging trolley.

[0012] The second ranging mechanism includes a ranging trolley and a laser rangefinder mounted on the ranging trolley.

[0013] The first ranging mechanism and the second ranging mechanism are on the same straight line and at the same height.

[0014] The present invention also provides a method for detecting billet deviation at the entrance of a heating furnace, using the aforementioned device for detecting billet deviation at the entrance of a heating furnace, and including the following steps:

[0015] S1. The billet has reached the exit position;

[0016] S2, The first ranging mechanism and the second ranging mechanism move to the designated position;

[0017] S3. The furnace door opens, the first distance measuring mechanism acquires the first distance value of the billet, the second distance measuring mechanism acquires the second distance value of the billet, and the control system calculates the difference between the first distance value and the second distance value; the judgment unit determines whether the billet has deviated based on the difference between the first distance value and the second distance value; if the judgment unit determines that the billet has deviated, the next step is executed:

[0018] S4. Automatic steel tapping is terminated, the control system alarms, and operators are reminded to intervene.

[0019] The present invention provides a device for detecting billet deviation at the furnace door. It does not require direct installation in the furnace body, has a better temperature environment, and operates stably. It can detect misaligned billets in a timely manner, notify operators to intervene, avoid malfunctions under automatic operation, and improve work efficiency. Attached Figure Description

[0020] This manual includes the following figures, which illustrate the following:

[0021] Figure 1 This is a schematic diagram of the arrangement of the device for detecting billet deviation at the entrance of the heating furnace according to the present invention;

[0022] Figure 2 This is a schematic diagram of the device for detecting billet deviation at the entrance of the heating furnace according to the present invention;

[0023] Figure 3 This is a partial structural schematic diagram of the device for detecting billet deviation at the entrance of the heating furnace according to the present invention;

[0024] Figure 4 This is a schematic diagram of the billet distance measurement status;

[0025] Figure 5 This is a schematic diagram of another distance measurement state of the billet;

[0026] Figure 6 This is a flowchart of the method for detecting billet deviation at the entrance of a heating furnace according to the present invention;

[0027] Figure 7 This is a schematic diagram of a billet in a misaligned state in existing technology;

[0028] The diagram is marked as follows:

[0029] 1. Track frame; 2. Blank; 3. Laser beam; 4. Laser ranging trolley system; 5. Laser rangefinder; 6. Range measuring trolley; 7. Traction cable; 8. Lower track; 9. Drive motor; 10. Encoder; 11. Upper support; 12. First upper pulley; 13. First middle pulley; 14. First lower pulley; 15. Second upper pulley; 16. Second middle pulley; 17. Second lower pulley; 18. First range measuring mechanism; 19. Second range measuring mechanism. Detailed Implementation

[0030] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation.

[0031] It should be noted that in the following embodiments, the terms "first," "second," and "third" do not represent an absolute distinction in structure and / or function, nor do they represent the order of execution; they are merely for the convenience of description.

[0032] like Figures 1 to 5 As shown, the present invention provides a device for detecting billet deviation at the entrance of a heating furnace, including a first measuring mechanism for obtaining a first distance value D1 of the billet and a second measuring mechanism for obtaining a second distance value D2 of the billet. The first measuring mechanism and the second measuring mechanism are electrically connected to a control system. The control system includes a judgment unit, which is configured to determine whether the billet has deviated based on the difference between the first distance value and the second distance value.

[0033] Specifically, such as Figures 1 to 3 As shown, the first and second distance measuring mechanisms are on the same straight line and at the same height. Both mechanisms are movable and can be moved to their respective positions before each steel tapping, according to the corresponding positioning settings. The first distance measuring mechanism includes a distance measuring trolley and a laser rangefinder mounted on it. Rollers are installed on the trolley. During distance measurement, the laser rangefinder faces the billet and is at the same height as the billet. The second distance measuring mechanism also includes a distance measuring trolley and a laser rangefinder mounted on it, with rollers on the trolley. The structures of the first and second distance measuring mechanisms are basically the same. They are connected to two drive mechanisms, which are also basically the same. The moving directions of the first and second distance measuring mechanisms are parallel to a first direction, which is horizontal and parallel to the moving direction of the billet in the end-to-end continuous heating furnace.

[0034] like Figures 1 to 3 As shown, the drive mechanism includes a drive motor and a power transmission mechanism connected to the drive motor. In this embodiment, the power transmission mechanism includes a traction cable, a first fixed pulley group, and a second fixed pulley group. The first fixed pulley group is fixedly connected to the motor shaft of the drive motor, and the traction cable is wound around the first and second fixed pulley groups. The traction cables of the two drive mechanisms are respectively fixedly connected to the ranging carriages of the first and second ranging mechanisms. After the drive motor operates, it drives the first fixed pulley group to rotate, which in turn drives the traction cable to move. The traction cable then drives the connected first or second ranging mechanism to move linearly along a first direction, thereby achieving position adjustment.

[0035] like Figures 1 to 3As shown, the first fixed pulley group and the second fixed pulley are set on the track frame. The track frame includes a lower track and an upper support. The distance measuring trolley is located between the lower track and the upper support. Both the lower track and the upper support are set horizontally and parallel to the first direction. The lower track is located below the upper support. The drive motor is fixedly set on the upper support. The lower track serves as a guide for the first distance measuring mechanism and the second distance measuring mechanism. Multiple rollers set on the distance measuring trolley are located on the lower track and can roll along the lower track.

[0036] like Figure 3 As shown, both the first and second fixed pulley groups consist of three fixed pulleys, with different heights. The first fixed pulley group has three fixed pulleys: an upper pulley, a middle pulley, and a lower pulley. These three pulleys are rotatably mounted on the upper support. The axes of these pulleys are parallel to a second direction, which is horizontal and perpendicular to the first direction. The height of the upper pulley's axis is greater than that of the middle and lower pulleys, and the height of the middle pulley's axis is also greater than that of the lower pulley. Similarly, the second fixed pulley group has three fixed pulleys: a second upper pulley, a second middle pulley, and a lower pulley. These three pulleys are rotatably mounted on the upper support, and their axes are parallel to a second direction. The height of the axis of the second upper pulley is greater than the height of the axis of the second middle pulley and the second lower pulley. The height of the axis of the second middle pulley is greater than the height of the axis of the second lower pulley.

[0037] like Figure 3 As shown, the traction cable is wound around a first upper pulley, a first middle pulley, a first lower pulley, a second upper pulley, a second middle pulley, and a second lower pulley. The first and second upper pulleys are at the same height, as are the first and second middle pulleys, and the first and second lower pulleys. The distance between the first and second upper pulleys is the same as the distance between the first and second lower pulleys, and the distance between the first and second upper pulleys is less than the distance between the first and second middle pulleys. This structure ensures that the traction cable can run along a constrained trajectory, improving operational stability and reliability.

[0038] like Figure 4 and Figure 5As shown, after the first and second ranging mechanisms move to their designated positions, the furnace door of the end-in / end-out continuous heating furnace opens. The laser beam emitted by the laser rangefinder of the first ranging mechanism is directed towards the billet, obtaining the distance between the rangefinder and one end of the billet, which is the first distance value D1. The laser beam emitted by the laser rangefinder of the second ranging mechanism is directed towards the billet, obtaining the distance between the rangefinder and the other end of the billet, which is the second distance value D2. The first and second ranging mechanisms send the measurement results to the control system. The control system calculates the difference ΔD between the first distance value D1 and the second distance value D2. When ΔD is within the allowable range, it indicates that the billet has not deviated, and the control system arranges for the billet to exit the furnace. Figure 5 As shown; when △D is greater than the set value, it indicates that the billet has deviated, the heating furnace will stop automatic steel tapping, and the control system will issue an alarm to remind the operator to intervene.

[0039] like Figure 6 As shown, the invention also provides a method for detecting billet deviation at the furnace door, using the above-described device for detecting billet deviation at the furnace door, and includes the following steps:

[0040] S1. The billet in the heating furnace reaches the exit position;

[0041] S2, The first and second ranging mechanisms move to the designated positions;

[0042] S3. The furnace door opens. The first distance measuring mechanism acquires the first distance value of the billet, and the second distance measuring mechanism acquires the second distance value of the billet. The control system calculates the difference between the first distance value and the second distance value. The judgment unit determines whether the billet has deviated based on the difference between the first distance value and the second distance value. If the judgment unit determines that the billet has deviated, the next step is executed:

[0043] S4. Automatic steel tapping is terminated, the control system alarms, and operators are reminded to intervene.

[0044] After the billet enters the heating furnace, its width positioning inside the furnace is recorded until it exits the furnace. Under normal circumstances, the billet is positioned perpendicular to the running direction in the width direction. If an unexpected event occurs and the billet deflects, the angle between the axis of the billet in the width direction and the running direction will no longer be 90 degrees. When the angle between the axis of the billet in the width direction and the running direction exceeds a certain degree, a danger will occur, making it difficult for the billet to exit the furnace automatically, requiring timely manual intervention.

[0045] In step S2 above, the control system sends a command to the drive mechanism based on the positioning data in the initial width direction of the billet. The drive mechanism then operates, causing the first and second distance measuring mechanisms to move to their respective designated positions.

[0046] In step S3 above, after the first and second ranging mechanisms move to their designated positions, the furnace door of the end-to-end continuous heating furnace opens. The laser beam emitted by the laser rangefinder of the first ranging mechanism is directed towards the billet, obtaining the distance between one end of the billet and the source, which is the first distance value D1. The laser beam emitted by the laser rangefinder of the second ranging mechanism is directed towards the billet, obtaining the distance between the other end of the billet and the source, which is the second distance value D2. The first and second ranging mechanisms send the measurement results to the control system, which calculates the difference ΔD between the first distance value D1 and the second distance value D2. If ΔD is within the allowable range, it indicates that the billet has not deviated, and the control system arranges for the billet to exit the furnace. If ΔD is greater than the set value, it indicates that the billet has deviated, and the next step is executed.

[0047] In step S4 above, after the control system determines that the billet is seriously deviated, the heating furnace stops automatically tapping steel, and the control system issues an alarm to remind the operator to intervene.

[0048] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A device for detecting billet deviation at the entrance of a heating furnace, characterized in that, The system includes a first distance measuring mechanism for acquiring a first distance value of the billet and a second distance measuring mechanism for acquiring a second distance value of the billet. The first and second distance measuring mechanisms are connected to a control system. The control system includes a judgment unit, which is configured to determine whether the billet has deviated based on the difference between the first distance value and the second distance value. The first and second ranging mechanisms are on the same straight line and at the same height, and the first and second ranging mechanisms are movable. The first ranging mechanism includes a ranging carriage and a laser rangefinder mounted on the ranging carriage. The ranging carriage is equipped with rollers. During ranging, the laser rangefinder faces the billet and is at the same height as the billet. The second ranging mechanism includes a ranging carriage and a laser rangefinder mounted on the ranging carriage. The ranging carriage is equipped with rollers. The first and second ranging mechanisms have the same structure. The first and second ranging mechanisms are respectively connected to two driving mechanisms. The two driving mechanisms have the same structure. The moving direction of the first and second ranging mechanisms is parallel to the first direction, which is horizontal and parallel to the moving direction of the billet in the continuous heating furnace. The drive mechanism includes a drive motor and a power transmission mechanism connected to the drive motor; the power transmission mechanism includes a traction cable, a first fixed pulley group and a second fixed pulley group, the first fixed pulley group is fixedly connected to the motor shaft of the drive motor, and the traction cable is wrapped around the first fixed pulley group and the second fixed pulley group; the traction cables of the two drive mechanisms are respectively fixedly connected to the ranging carriages of the first ranging mechanism and the second ranging mechanism; after the drive motor runs, it drives the first fixed pulley group to rotate, the first fixed pulley group drives the traction cable to run, and the traction cable drives the connected first ranging mechanism or second ranging mechanism to move linearly along the first direction to achieve position adjustment; The first and second fixed pulleys are mounted on the track frame, which includes a lower track and an upper support. The ranging trolley is located between the lower track and the upper support. Both the lower track and the upper support are horizontally arranged and parallel to the first direction. The lower track is located below the upper support. The drive motor is fixedly mounted on the upper support. The lower track serves as a guide for the first and second ranging mechanisms. Multiple rollers mounted on the ranging trolley are located on the lower track and can roll along the lower track. Both the first and second fixed pulley groups consist of three fixed pulleys, with different heights for each. The three fixed pulleys in the first fixed pulley group are a first upper pulley, a first middle pulley, and a first lower pulley. The first upper pulley, the first middle pulley, and the first lower pulley are rotatably mounted on the upper support. The axes of the first upper pulley, the first middle pulley, and the first lower pulley are parallel to a second direction, which is horizontal and perpendicular to the first direction. The height of the axis of the first upper pulley is greater than the height of the axes of the first middle pulley and the first lower pulley, and the height of the axis of the first middle pulley is greater than the height of the axis of the first lower pulley; the three fixed pulleys of the second fixed pulley group are the second upper pulley, the second middle pulley, and the second lower pulley, which are rotatably mounted on the upper support. The axes of the second upper pulley, the second middle pulley, and the second lower pulley are parallel to the second direction; the height of the axis of the second upper pulley is greater than the height of the axes of the second middle pulley and the second lower pulley, and the height of the axis of the second middle pulley is greater than the height of the axis of the second lower pulley. The traction cable is wrapped around the first upper pulley, the first middle pulley, the first lower pulley, the second upper pulley, the second middle pulley, and the second lower pulley. The first upper pulley and the second upper pulley are at the same height, the first middle pulley and the second middle pulley are at the same height, the first lower pulley and the second lower pulley are at the same height, the distance between the first upper pulley and the second upper pulley is the same as the distance between the first lower pulley and the second lower pulley, and the distance between the first upper pulley and the second upper pulley is less than the distance between the first middle pulley and the second middle pulley. After the first and second ranging mechanisms move to their designated positions, the furnace door of the continuous heating furnace opens. The laser beam emitted by the laser rangefinder of the first ranging mechanism is directed towards the billet, and the distance between the rangefinder and one end of the billet is obtained, which is the first distance value D1. The laser beam emitted by the laser rangefinder of the second ranging mechanism is directed towards the billet, and the distance between the rangefinder and the other end of the billet is obtained, which is the second distance value D2. The first and second ranging mechanisms send the measurement results to the control system, and the control system calculates the difference ΔD between the first distance value D1 and the second distance value D2. When △D is within the allowable range, it indicates that the billet has not deviated, and the control system arranges for the billet to be discharged from the furnace; when △D is greater than the set value, it indicates that the billet has deviated, the heating furnace stops automatic steel discharge, and the control system issues an alarm to remind the operator to intervene.

2. A method for detecting billet deviation at the entrance of a heating furnace, characterized in that, The apparatus for detecting billet deviation at the furnace inlet as described in claim 1 includes the following steps: S1. The billet has reached the exit position; S2, The first ranging mechanism and the second ranging mechanism move to the designated position; S3. The furnace door is opened. The first distance measuring mechanism obtains the first distance value of the billet, and the second distance measuring mechanism obtains the second distance value of the billet. The control system calculates the difference between the first distance value and the second distance value. The judgment unit judges whether the billet has deviated based on the difference between the first distance value and the second distance value. If the judgment unit determines that the billet is misaligned, proceed to the next step: S4. Automatic steel tapping is terminated, the control system alarms, and operators are reminded to intervene.

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