Device and method for automatically judging length and short length of fixed-length steel plate

Abstract

The invention relates to a device and a method for automatically judging the length and the short length of a fixed-length steel plate, the device comprises a controller and a detection mechanism, the detection mechanism comprises a supporting beam parallel to the conveying direction of a conveying roller way, a track is arranged on the supporting beam along the length direction, and a walking mechanism is arranged on the track and comprises a bracket; the support is provided with a rolling wheel moving along the track, the support is provided with a driving mechanism used for driving the rolling wheel to walk, the support is provided with a distance measuring sensor and a displacement sensor, the driving mechanism, the distance measuring sensor and the displacement sensor are all in signal connection with the controller, and the distance measuring sensor is used for detecting a steel plate on a conveying roller way. The displacement sensor is used for detecting the distance between the distance measuring sensor and a shearing position of the shearing machine, the displacement sensor is in signal connection with the driving mechanism, the controller is in signal connection with a control system of the shearing machine, and the controller is further connected with an alarm. The steel plate shearing length can be timely prevented from being short, and the rejection rate is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of steel billet production, and in particular to a device and method for automatically determining the short length of a cut-to-length steel plate. Background Art

[0002] In the steel plate production process, the steel plate rolled out of the rolling mill often needs to be sheared in sections during the shearing process, that is, a steel plate is cut into several sections according to the contract or pre-planned length. During the shearing process, the steel plate to be sheared needs to be transported to a certain position according to the predetermined length, that is, length positioning, and then the shearing operation is started.

[0003] Length positioning is a critical link in the steel plate shearing process. There are several ways to measure length positioning, including measuring rollers with encoders, sizing machines with encoders, and high-precision laser speed meters.

[0004] Regardless of the method adopted, inaccurate positioning will occur if the steel plate slips against the surface of the transport roller under abnormal circumstances or if instruments such as encoders and tachometers are disturbed or fail.

[0005] Generally, in actual operations, manual confirmation is required after positioning is completed.

[0006] This process is currently generally carried out in a remote operation room, and the positioning confirmation is checked by the camera to see if it is at the target position. However, there are the following problems in actual work: 1. Since the target length of each steel plate is uncertain, the position of the camera cannot be moved, but the cutting length of the steel plate is not fixed, which will cause the viewing angle of some lengths of steel plates in the camera to not always be perpendicular to the on-site verification scale.

[0007] 1. Although the remote confirmation device for steel plate positioning has been added in the early stage, the accuracy and convenience of manual confirmation have been greatly improved by adding mobile cameras and laser marking instruments. However, it is still impossible to automatically determine and alarm when the size positioning is abnormal. If the operator fails to discover and handle it in time, it may still cause the shear length to be wrong due to inaccurate positioning.

[0008] In the actual production process, if the positioning length is greater than the target length, secondary shearing can be performed to save it. If the shearing length is less than the target length, the steel plate will be short, resulting in the failure of the steel plate to fulfill the contract and causing a quality accident. The entire steel plate becomes waste. Therefore, in the actual steel plate shearing process, how to avoid the short shearing length is an important control point for length shearing. It is very important to improve the length positioning accuracy, enhance the convenience of steel plate positioning and timely alarm of abnormal conditions. Summary of the invention

[0009] The object of the present invention is to solve the above-mentioned technical problems existing in the prior art, and to provide a device and method for automatically determining the short length of a fixed-length steel plate.

[0010] The present invention provides the following technical solutions: A device for automatically determining the short length of a fixed-length steel plate, including a controller and a detection mechanism. The detection mechanism includes a support beam arranged parallel to the conveying direction of the conveying roller path. Along the length direction of the support beam, there is a track, and a walking mechanism is installed on the track. The walking mechanism includes a bracket, on which rollers moving along the track are installed. A driving mechanism for driving the rollers to walk is installed on the bracket. A distance measuring sensor and a displacement sensor are installed on the bracket. The driving mechanism, the distance measuring sensor and the displacement sensor are all connected to the controller by signals. The distance measuring sensor is used to detect the steel plate on the conveying roller path, and the displacement sensor is used to detect the distance from the distance measuring sensor to the shearing position of the shearing machine. The displacement sensor is connected to the driving mechanism by signals. The controller is connected to the control system of the shearing machine by signals, and the controller is also connected to an alarm.

[0011] Further, a laser marking device is installed on the bracket. The laser marking device is used to draw an indication marking on the conveying roller path, and the indication marking is used to assist workers in judging the positioning deviation of the steel plate.

[0012] Further, a high-definition camera aiming at the conveying roller path is installed on the bracket, and the high-definition camera is connected to a remote control system.

[0013] Further, the driving mechanism includes a servo motor, a gear and a rack. The gear is installed at the output end of the servo motor, the gear meshes with the rack, the rack is installed on the support beam and arranged parallel to the track, and the servo motor is connected to the controller by signals.

[0014] Further, the support beam is arranged above, below or on both sides of the conveying roller path.

[0015] Further, a scale with graduations is arranged on one side of the conveying roller path. The scale extends along the conveying direction, and the zero position of the scale is aligned with the shearing position.

[0016] Further, the present invention also provides a method for determining the short length of a fixed-length steel plate. Using the above device, it specifically includes the following steps: S1. The controller obtains the required shearing length of the next steel plate, and controls the driving mechanism according to this shearing length to move the bracket along the track to a specified position; S2. Before the conveying roller path starts to convey the next steel plate until the steel plate stops and the shearing machine is ready to shear, the distance measuring sensor detects the steel plate on the roller path. If the steel plate is detected, shearing is performed. If the steel plate is not detected, a signal is sent to the controller. The controller prohibits the shearing machine from performing the shearing action, and at the same time triggers the alarm to prompt the operator to check and readjust the positioning length.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: On the one hand, the short-length shearing positioning of the steel plate length, which was originally determined manually, has been realized through automatic determination by the instrument and control system, and an alarm is given to the operator before shearing to remind the operator to conduct a review and repositioning, so as to timely avoid the short-length of the sheared steel plate. On the other hand, the determination accuracy by the instrument is significantly better than that by manual visual inspection. While improving the determination accuracy, it effectively avoids the unplanned short-length of the steel plate length caused by untimely manual confirmation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the device of the present invention; Figure 2 is a schematic diagram for determining the length of the steel plate by the device of the present invention; In the figure: 1, support beam; 2, track; 3, bracket; 4, distance measuring sensor; 5, laser marking device; 6, conveying roller table; 7, steel plate; 8, scale; 9, shearing position; 10, center line of the roller table. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Please refer to Figure 1-2 , this embodiment is a device for automatically determining the short length of the fixed-length steel plate, including a controller and a detection mechanism. The detection mechanism includes a support beam 1 arranged parallel to the conveying direction of the conveying roller table 6. Along the length direction of the support beam 1, there is a track 2. A walking mechanism is installed on the track 2. The walking mechanism includes a bracket 3. A roller moving along the track 2 is installed on the bracket 3. A driving mechanism for driving the roller to walk is installed on the bracket 3. A distance measuring sensor 4 and a displacement sensor are installed on the bracket 3. The driving mechanism, the distance measuring sensor 4 and the displacement sensor are all connected to the controller by signals. The distance measuring sensor 4 is used to detect the steel plate 7 on the conveying roller table 6. The displacement sensor is used to detect the distance from the distance measuring sensor 4 to the shearing position 9 of the shearing machine. The displacement sensor is connected to the driving mechanism by signals. The controller is connected to the control system of the shearing machine by signals. The controller is also connected to an alarm.

[0020] Furthermore, a laser marking device 5 is installed on the bracket 3. The laser marking device 5 is used to draw an indication marking on the conveying roller table 6. The indication marking is used to assist the worker in judging the positioning deviation of the steel plate 7.

[0021] Furthermore, a high-definition camera aiming at the conveying roller table 6 is installed on the bracket 3. The high-definition camera is connected to a remote control system, and the captured image is displayed in real time on the screen of the remote control system.

[0022] Furthermore, the driving mechanism includes a servo motor, a gear and a rack. The gear is installed at the output end of the servo motor. The gear meshes with the rack. The rack is installed on the support beam 1 and arranged parallel to the track 2. The servo motor is connected to the controller by signals.

[0023] Further, a scale 8 with graduations is provided on one side of the transport roller table 6. The scale 8 extends along the transport direction, and the zero position of the scale 8 is aligned with the shearing position 9.

[0024] Further, the support beam 1 is arranged above or below or on both sides of the transport roller table 6. Hereinafter, taking the installation on the side as an example for detailed description, the support beam 1 is installed on the side of the transport roller table 6 through two columns, and the scale 8 is installed on the other side of the roller table. When the steel plate 7 moves to the specified position, the distance L1 measured by the distance measuring sensor 4 is the distance from the distance measuring sensor 4 to the side of the steel plate 7. The distance measuring sensor 4 is installed at a position where the laser marking is appropriately offset towards the shearing position 9, and the offset distance is L0. L0 is the target length of the steel plate 7 minus the minimum allowable length of the steel plate 7 (about 40 mm in this embodiment).

[0025] The height of the distance measuring sensor 4 above and below is generally installed at a position 8 mm above the surface of the roller table. In this way, when the head of the steel plate 7 with a thickness of more than 10 mm has not reached the area of the distance measuring sensor 4, the distance L1 measured by the distance measuring sensor 4 is the distance from the installation position of the distance measuring sensor 4 to the edge baffle on the opposite side of the roller table. When the head of the steel plate 7 exceeds the distance measuring sensor 4, the distance L1 measured by the distance measuring sensor 4 is the distance from the installation position of the grating to the edge of the steel plate 7. The distance from the distance measuring sensor 4 to the center line 10 of the roller table is L2.

[0026] The method for automatically determining the shearing of the steel plate 7 by using the above device is as follows: When the controller obtains the shearing length of the next steel plate 7, the controller compares the distance L detected by the displacement sensor with the shearing length, automatically calculates the distance that the bracket 3 needs to move, and then sends a signal to the servo motor. The servo motor drives the bracket 3 to move to the specified position so that the distance between the distance measuring sensor 4 and the shearing position 9 is equal to the shearing length and the bracket 3 stops at this position. At the same time, the laser marking device draws a visible marking line on the transport roller table 6, and this marking line is used as an auxiliary line for the operator to observe and judge through the camera.

[0027] The transport roller table 6 conveys the steel plate 7 forward. When the steel plate 7 stops, if the distance L1 detected by the distance measuring sensor 4 is less than L2, it means that the positioning length of the steel plate 7 is greater than the minimum allowable length for shearing, and the controller determines that shearing can be performed, and the shearing machine normally executes the shearing action; if L1≥L2, it means that the positioning length of the steel plate 7 is less than the minimum allowable length for shearing, and direct shearing will cause the steel plate 7 to be under-sized.

[0028] At this time, the controller will automatically send a signal to the control system of the shearing machine to prohibit the execution of the shearing action, and trigger the alarm to sound an alarm to remind the operator. After receiving the alarm, the operator can first see the scale displayed by the head of the current steel plate 7 on the scale 8 through the picture taken by the camera to improve the accuracy of the detection system. After confirming that the shearing action cannot be performed, the operator then operates the conveying roller table 6 to reposition the steel plate 7 to ensure that the shearing length of the steel plate 7 meets the requirements.

Claims

1. A device for automatically determining the short length of a cut-to-length steel plate, characterized by: It includes a controller and a detection mechanism, the detection mechanism includes a support beam arranged parallel to the conveying direction of the transport roller, a track is provided on the support beam along the length direction, a walking mechanism is installed on the track, the walking mechanism includes a bracket, a roller moving along the track is installed on the bracket, a driving mechanism for driving the roller to walk is installed on the bracket, a distance sensor and a displacement sensor are installed on the bracket, the driving mechanism, the distance sensor and the displacement sensor are all connected with the controller signal, the distance sensor is used to detect the steel plate on the transport roller, the displacement sensor is used to detect the distance from the distance sensor to the shearing position of the shearing machine, the displacement sensor is connected with the drive mechanism signal, the controller is connected with the shearing machine control system signal, and the controller is also connected with an alarm.

2. The device for automatically determining the short length of a cut-length steel plate according to claim 1 is characterized in that: The bracket is provided with a laser marking device, which is used to draw an indication line on the transport roller, and the indication line is used to assist workers in judging the positioning deviation of the steel plate.

3. The device for automatically determining the short length of a cut-length steel plate according to claim 1 is characterized in that: The bracket is provided with a high-definition camera aimed at the transport roller, and the high-definition camera is connected to the remote control system.

4. The device for automatically determining the short length of a cut-length steel plate according to claim 1 is characterized in that: The driving mechanism includes a servo motor, a gear and a rack. The gear is installed at the output end of the servo motor, the gear is meshed with the rack, the rack is installed on the support beam and arranged parallel to the track, and the servo motor is connected to the controller signal.

5. The device for automatically determining the short length of a cut-length steel plate according to claim 1 is characterized in that: The support beam is arranged above, below or on both sides of the transport roller.

6. The device for automatically determining the short length of a cut-length steel plate according to claim 1 is characterized in that: A scale with scale is arranged on one side of the transport roller, the scale extends along the transport direction, and the zero position of the scale is aligned with the shearing position.

7. The method for determining whether the length of a cut-to-length steel plate is short is characterized by: The device according to any one of claims 1 to 6 specifically comprises the following steps: S1, a controller obtains the required shearing length of the next steel plate, and controls the driving mechanism according to the shearing length to move the bracket to a specified position along the track; S2. When the transport roller starts to transport the next steel plate and the steel plate stops, before the shearing machine is ready to cut, the distance sensor detects the steel plate on the roller. If a steel plate is detected, it is sheared. If no steel plate is detected, a signal is sent to the controller. The controller prohibits the shearing machine from performing the shearing action and triggers the alarm to prompt the operator to check and readjust the positioning length.

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