Device for preventing strip steel from being scraped

Abstract

The utility model discloses a device for preventing strip steel from being scraped, which relates to the technical field of steel rolling production and comprises a scraping detection mechanism, a dust removal mechanism, a remote station, a controller and an alarm unit. The two sensors are respectively arranged on two sides of the inner side of a cold continuous rolling unit frame and are used for detecting edge positions of strip steel in real time; the dust removal mechanism is mounted in the inlet loop, is adjacent to the scraping detection mechanism and is used for removing dust from the scraping detection mechanism; the alarm unit is used for giving an alarm when the scraping detection mechanism detects the steel belt; the remote station is arranged on the site of the cold continuous rolling unit and used for signal transfer, and the scraping detection unit and the dust removal mechanism are connected with the controller through the remote station. And the controller is electrically connected with the alarm unit and a loop punching motor of the inlet loop respectively. The utility model solves the problem that when the strip steel offset of the existing cold continuous rolling unit is too large, serious scraping and even strip breakage are easily caused.

Description

Technical Field

[0001] The utility model relates to the technical field of steel rolling production, in particular to an edge scraping prevention device for strip steel deviation in a tandem cold rolling strip steel production unit. Background Art

[0002] The tandem cold rolling strip steel production unit is a key device in steel rolling production, and its stable operation is directly related to production efficiency and product quality. In the current tandem cold rolling unit, three loopers are designed to adjust the strip steel tension and speed matching. Among them, the No. 1 looper adopts a four-layer strip steel stacking design, which can store about 605 meters of strip steel, effectively buffering the speed fluctuations during the production process. Two deviation rectifying devices are installed inside this looper, which can quickly respond and perform precise deviation rectification when the strip steel rushes through the looper at a speed of up to 500 m / min, ensuring the stability and flatness of the strip steel during high-speed operation. The response time of the deviation rectifying system from the operator side to the drive side is 8 seconds, and this design can fully meet the strip steel deviation rectifying work in most cases.

[0003] However, in the face of complex and changeable raw material conditions, such as serious sickle bend, wedge deformation and other problems of the strip steel, or when the servo valve of the deviation rectifying system gets stuck and fails to act, the existing deviation rectifying devices may not be able to fully cope with the situation, resulting in the edge of the strip steel scraping the frame of the unit, and then causing damage to the edge of the strip steel. Even in the case of high-speed punching through the looper, the scraping length can reach up to hundreds of meters, and even break the strip steel, causing a strip break, and there is a risk of damaging the equipment. It takes 8 hours to shut down the machine for handling, seriously affecting production continuity and product quality, and reducing production efficiency. Therefore, it is urgent to add a set of strip steel edge scraping prevention devices to play a protective role. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an edge scraping prevention device for strip steel, which can solve the problem that when the deviation of the strip steel in the existing tandem cold rolling unit is too large, it is easy to cause serious edge scraping and even strip breakage.

[0005] To solve the above problems, the technical solution adopted by the utility model is: this edge scraping prevention device for strip steel includes an edge scraping detection mechanism, a dust removal mechanism, a remote station, a controller and an alarm unit.

[0006] The edge scraping detection mechanism includes two detection units located inside the inlet looper on the inlet side of the deviation rectifying roll. They are respectively installed on both sides inside the frame of the tandem cold rolling unit, and are used to detect the edge position of the strip steel in real time.

[0007] The dust removal mechanism is installed inside the inlet looper, adjacent to the edge scraping detection mechanism, and is used to remove dust from the edge scraping detection mechanism.

[0008] The alarm unit is used to give an alarm when the edge scraping detection mechanism detects the steel strip.

[0009] The remote station is set at the site of the tandem cold rolling mill unit for signal relay. The edge scraping detection unit and the dust removal mechanism are respectively connected to the controller through the remote station;

[0010] The controller is respectively electrically connected to the alarm unit and the loop punching motor of the entry loop.

[0011] In the technical solution of the above strip edge scraping prevention device, a more specific technical solution may further be: the detection unit includes a photoelectric switch and a photoelectric switch reflector. The photoelectric switch is installed inside the frame of the tandem cold rolling mill unit and is higher than the horizontal height of the strip at the entry side of the deviation rectifying roller. The photoelectric switch reflector is located directly below the photoelectric switch.

[0012] In some possible implementation schemes, the distance between the photoelectric switch and the frame of the tandem cold rolling mill unit ranges from 5 to 10 cm, and the photoelectric switch is at least 5 to 10 cm higher than the running horizontal height of the strip.

[0013] In some possible implementation schemes, the dust removal mechanism includes a nozzle, and the nozzle is communicated with a compressed air gas source.

[0014] In some possible implementation schemes, the nozzle orifice is inclined to the plate surface of the photoelectric switch reflector.

[0015] In some possible implementation schemes, the detection unit is set within 1 m on the entry side of the deviation rectifying roller.

[0016] In some possible implementation schemes, the alarm unit includes an HMI screen display alarm unit.

[0017] In some possible implementation schemes, the controller is a PLC controller.

[0018] Due to the adoption of the above technical solution, the present utility model has the following beneficial effects compared with the prior art: An edge scraping detection mechanism is set in the entry loop on the entry side of the deviation rectifying roller, which can timely and accurately detect the abnormal position of the strip edge before the strip deviates and may cause the risk of edge scraping or strip breakage. The detected abnormal signal is transmitted to the controller through the relay of the remote station at the site of the tandem cold rolling mill unit. The controller controls the alarm unit to give an alarm, and at the same time controls the loop punching motor of the entry loop to stop. The edge scraping length of the strip can be greatly reduced. After manual intervention and treatment, the production can be resumed, which greatly improves the production efficiency and effectively prevents serious edge scraping and strip breakage. The dust removal mechanism is set, which can effectively clean the accumulated dust and iron powder on the detection mechanism, avoid false alarms caused by accumulated dust and iron powder after the detection mechanism runs for a period of time, and thus improve the accuracy and reliability of the detection mechanism. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the device for preventing strip edge scraping.

[0020] Figure 2 It is the front view of the device for preventing strip edge scraping.

[0021] Figure 3 It is Figure 2 the top view of.

[0022] Figure 4 It is a schematic diagram of the relative positions of the detection unit and the nozzles of the dust removal mechanism.

[0023] Figure 5 It is the principle block diagram of the device for preventing strip edge scraping.

[0024] Explanation of the reference numerals in the figure: 1. Strip; 2. Reflector of the photoelectric switch; 3. Photoelectric switch; 4. Remote station; 5. Controller; 6. Alarm unit; 7. Deviation correction roller; 8. Detection unit; 9. Dust removal mechanism; 10. Nozzle. Specific implementation mode

[0025] The following further details the present utility model in conjunction with the embodiments with the attached drawings:

[0026] Figures 1 to 5The described device for preventing strip edge scraping mainly includes an edge scraping detection mechanism, a dust removal mechanism 9, a remote station 4, a controller 5, and an alarm unit 6. The edge scraping detection mechanism and the dust removal mechanism 9 are respectively connected to the controller 5 through the remote station 4. The controller 5 is also electrically connected to the alarm unit 6 and the loop flushing motor of the entry loop (not shown in the figure). Among them, the edge scraping detection mechanism is installed inside the frame of the cold tandem rolling mill to directly monitor the edge of the strip 1. Thus, when the abnormal deviation of the strip 1 is detected, it can be processed in time to prevent the edge of the strip 1 from scraping the mill frame and causing damage to the strip edge. It is worth mentioning that the edge scraping detection mechanism is arranged inside the entry loop on the entry side of the deviation rectifying roll 7, which can monitor the state of the strip 1 in real time before it enters the deviation rectifying roll 7, timely detect the minor scraping or deviation of the strip 1 edge, and can more accurately identify the deviation direction and degree of the strip 1, providing an accurate deviation rectifying signal for the deviation rectifying roll 7, and corrective measures can be taken before the edge scraping problem deteriorates into a strip break accident, thus effectively preventing the occurrence of strip break accidents and reducing the downtime. The working environment of the cold tandem rolling mill is often relatively harsh, with adverse factors such as high temperature, high humidity, dust, and vibration. These environmental factors may damage the hardware of the controller 5 and affect the stability and reliability of the controller. Therefore, in order to ensure the long-term stable operation of the controller, it is usually not directly set on-site, but the controller 5 is set in a control room far from the site. To ensure the real-time, accuracy of information and the reliability of the control system, a remote station 4 is set at the site of the cold tandem rolling mill of the strip 1. The remote station 4 is responsible for collecting on-site signals and then transmitting the signals to the controller 5 in the operating room by wired or wireless means. The controller 5 sends instructions to the alarm unit 6. As an important link for maintaining the accuracy of the system, the dust removal mechanism 9 has its dust removal actuator arranged adjacent to the edge scraping detection mechanism, and dusts the edge scraping detection mechanism regularly or as needed to remove impurities such as accumulated dust and iron powder.

[0027] As Figures 1 to 4As shown in the figure, the edge scraping detection mechanism of this embodiment includes two groups of detection units 8, located on both sides of the transmission path of the strip steel 1, for real-time detection of the edge position of the strip steel 1. These two groups of detection units 8 are symmetrically installed on both sides inside the frame of the tandem cold rolling mill. The detection unit 8 is arranged within 1 m from the entrance side of the deviation rectifying roller 7 in the entrance loop on the entrance side of the deviation rectifying roller to ensure that the edge position of the strip steel can be accurately captured when it enters the deviation rectifying area. Each group of detection units 8 includes a photoelectric switch 3 and a photoelectric switch reflector 2. The installation height of the photoelectric switch 3 is 5 - 10 cm higher than the horizontal height of the strip steel 1 when it is conveyed on the entrance side of the deviation rectifying roller 7, and at the same time, the distance from the frame is maintained between 5 - 10 cm to avoid physical interference and optimize the detection accuracy. Preferably, the installation height of the photoelectric switch 3 is 10 cm higher than the horizontal height of the strip steel 1 when it is conveyed on the entrance side of the deviation rectifying roller 7, and the distance from the frame is 5 cm. The photoelectric switch reflector 2 is located directly below the photoelectric switch 3 to ensure that the light can be accurately reflected back to the photoelectric switch 3. The photoelectric switch 3 emits a light beam, and the light beam is reflected by the photoelectric switch reflector 2 and then received by the photoelectric switch 3 to form a stable optical path. When the strip steel 1 passes through this area at a certain speed, if the edge of the strip steel 1 has a large deviation, it will block the light beam, resulting in a change in the optical signal received by the photoelectric switch 3. After detecting the change in the optical signal, the photoelectric switch 3 converts it into an electrical signal and transmits the signal to the remote station 4 through a cable or wirelessly.

[0028] As Figure 1 and Figure 4 shown in the figure, in some embodiments, the dust removal mechanism 9 includes a nozzle 10, and the nozzle 10 is communicated with a compressed air gas source to ensure continuous supply of high-pressure gas for dust removal. The nozzle 10 is installed in the entrance loop, adjacent to the edge scraping detection mechanism, to effectively remove dust or impurities that may be generated due to the movement of the strip steel 1. The nozzle 10 is designed such that the nozzle opening is inclined to the plate surface of the photoelectric switch reflector 2, so that it can not only effectively remove the dust on the photoelectric switch reflector 2, but also avoid directly blowing towards the photoelectric switch 3 to cause interference.

[0029] In some embodiments, the detection unit 8 and the dust removal mechanism 9 are connected to the remote station 4 by wired or wireless means to perform relay processing on the detection signals and control instructions. The remote station 4 also has a communication interface with a host computer (such as a computer monitor in the operation room, i.e., HMI), and can upload important data or alarm information to a higher-level management system.

[0030] In some embodiments, the controller 5 selects a PLC controller. The PLC controller receives signals from the remote station and determines whether the position of the strip 1 is abnormal according to the preset logic. Once an abnormality is detected, the controller 5 immediately controls the alarm unit 6 to issue an alarm and controls the loop punching motor to stop. The alarm unit 6 includes an HMI screen display alarm unit. After receiving the signal, the alarm unit 6 displays the alarm screen information on the computer display screen in the operation room. In other embodiments, the alarm unit 6 may further include a voice alarm module and an alarm record module. The voice alarm module outputs alarm information through an audio file, and the alarm record module displays the detailed information of various alarms through alarm and event summaries.

[0031] As Figure 1 and Figure 5 shown, when the strip edge protection device is working, the detection units 8 on both sides continuously monitor the edge position of the strip 1. By detecting the change of the signal of the detection unit 8, the position and device of the strip 1 are judged. When the offset of the strip 1 is too large and it is about to scrape the unit frame, when the edge of the strip 1 blocks the optical path between the photoelectric switch 3 and the photoelectric switch reflector 2, the optical signal received by the photoelectric switch 3 weakens or disappears, indicating that the strip 1 has deviated from the normal path, thus triggering the detection mechanism. It will convert this abnormal signal into an electrical signal and transmit it to the remote station 4 through a cable or wirelessly. After receiving the electrical signal transmitted by the photoelectric switch 3, the remote station 4, as a signal transfer station, will perform preliminary processing and send the processed signal to the controller 5. After receiving the abnormal signal transmitted by the remote station 4, the controller 5 will immediately trigger the shutdown mechanism and control the loop punching motor of the entry loop to stop, so as to prevent the strip 1 from further scraping the edge or breaking during the high-speed punching process. At the same time, the controller 5 will also send the alarm signal of the strip 1 running off track to the computer display in the operation room, and the HMI displays the alarm screen to remind the operator to pay attention. The operator can view the offset situation of the strip 1 in real time through the computer screen and perform manual intervention as needed. After receiving the alarm signal, the operator will immediately go to the site to check the offset situation of the strip 1 and perform corresponding processing. After the processing is completed, the operator can send a production resumption instruction to the controller 5 through the control interface. After receiving the production resumption instruction, the controller 5 will control the loop punching motor to restart and resume the normal production process of the strip 1.

[0032] In other embodiments, after receiving the abnormal signal transmitted by the remote station 4, the controller 5 can also immediately trigger the speed reduction mechanism and control the loop punching motor of the entry loop to reduce speed. The short-term start-stop and speed reduction of the loop punching motor do not affect the rolling of the rolling mill.

[0033] Since there is a lot of iron powder in the loop, the photoelectric switch reflector is very easy to accumulate dust and iron powder. After running for a period of time, the photoelectric switch 3 detects the iron powder on the photoelectric switch reflector 2 and mismeasures it as the strip steel 1 and sends out a strip steel deviation signal, resulting in false alarms. An air nozzle is added and connected to the air source. The compressed air can effectively clean the dust and iron powder on the photoelectric switch reflector 2, greatly improving the detection accuracy of the photoelectric switch 3.

[0034] This device for preventing strip steel edge scraping significantly reduces the risk of strip steel edge scraping and breakage. Especially when processing strip steel 1 with poor plate shape and severe camber, the effect is particularly obvious. The edge scraping length is controlled within 10 meters, and the processing time is shortened to about 1 hour, greatly improving the production efficiency. It also reduces the risk of equipment damage and production interruption time caused by shutting down the machine to handle the edge scraping problem.

[0035] As described above, the above are only specific embodiments of the present invention, aiming to illustrate the core idea and implementation mode of the present invention. After understanding the basic principles and ideas of the present invention, those skilled in the art are fully capable of making various reasonable changes, modifications, and further optimizations based on the disclosure of the present invention. These should not be regarded as exceeding the protection scope of the present invention. Therefore, the protection scope of the present invention is not limited to the above specific embodiments, but covers any form of changes, variations, combinations, or applications made based on the concept of the present invention without departing from the core spirit and substantial content of the present invention, and should be included within the protection scope of the present invention.

Claims

1. A device for preventing strip edge scraping, characterized in that: It includes an edge scraping detection mechanism, a dust removal mechanism, a remote station, a controller and an alarm unit. The edge scraping detection mechanism includes two sets of detection units located in the inlet loop on the inlet side of the deviation rectifying roller. They are respectively installed on both sides inside the frame of the cold tandem rolling mill unit and are used to detect the edge position of the strip steel in real time. The dust removal mechanism is installed in the inlet loop, adjacent to the edge scraping detection mechanism, and is used to remove dust from the edge scraping detection mechanism. The alarm unit is used to give an alarm when the edge scraping detection mechanism detects the steel strip. The remote station is set at the site of the cold tandem rolling mill unit and is used for signal transfer. The edge scraping detection unit and the dust removal mechanism are respectively connected to the controller through the remote station. The controller is electrically connected to the alarm unit and the loop punching motor of the inlet loop respectively.

2. The strip edge scraping prevention device according to claim 1, wherein: The detection unit includes a photoelectric switch and a photoelectric switch reflector. The photoelectric switch is installed on the inner side of the frame of the cold tandem rolling mill unit and is higher than the horizontal height of the strip steel conveyed on the inlet side of the deviation rectifying roller. The photoelectric switch reflector is located directly below the photoelectric switch.

3. The strip edge scraping prevention device according to claim 2, characterized in that: The distance between the photoelectric switch and the frame of the cold tandem rolling mill unit ranges from 5 to 10 cm, and the photoelectric switch is at least 5 to 10 cm higher than the running horizontal height of the strip steel.

4. The device for preventing strip edge scraping according to any one of claims 2 or 3, characterized in that: The dust removal mechanism includes a nozzle, and the nozzle is communicated with a compressed air gas source.

5. The device for preventing strip edge scraping according to claim 4, characterized in that: The nozzle orifice is inclined to the plate surface of the photoelectric switch reflector.

6. The device for preventing strip edge scraping according to claim 1, wherein: The detection unit is set within 1 m on the inlet side of the deviation rectifying roller.

7. The strip edge scraping prevention device according to claim 1, wherein: The alarm unit includes an HMI screen display alarm unit.

8. The strip edge scraping prevention device according to claim 1, wherein: The controller is a PLC controller.

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