Device and method for preventing hot-rolled strip from being scratched on the delivery table

Abstract

The present application belongs to the field of hot rolling, and particularly relates to a device and method for preventing hot-rolled strip from being scratched on an output roller way. The present application provides a device for preventing hot-rolled strip from being scratched on an output roller way. The device for preventing hot-rolled strip from being scratched on an output roller way is arranged on a strip hot rolling mill, and comprises a plurality of Hall current transformers, a first temperature sensor, a second temperature sensor and a control center. Wherein, one Hall current transformer is arranged on a power transmission line of a motor corresponding to each roller way of the strip hot rolling mill. One first temperature sensor is installed on a bearing end of each motor. One second temperature sensor is installed on a bearing end of each roller way. The control center is electrically connected with the plurality of Hall current transformers, the plurality of first temperature sensors and the second temperature sensors.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of hot rolling, and particularly relates to a device and method for preventing hot-rolled strip from being scratched on an output roller. BACKGROUND

[0002] In the current technology, the driving motors of multiple rollers of a hot continuous rolling mill are controlled by one frequency converter. The frequency converter can detect the total current value of all the motors, and the control system cannot identify the running condition and process "health" state of each roller.

[0003] When instant blocking, abnormal disconnection of a handover, roller running process degradation, roller surface data tracking, roller diameter change, etc. of a certain roller occur, it cannot be discovered in time, causing the roller to instantaneously stop, the speed to decrease, the transmission roller line speed to be inconsistent, and the roller to reverse, etc., resulting in quality accidents such as steel plate scratching. SUMMARY

[0004] To overcome the defects in the above related technology, on the one hand, the present application provides a device for preventing hot-rolled strip from being scratched on an output roller. The device for preventing hot-rolled strip from being scratched on an output roller is arranged on a strip hot rolling mill, and comprises multiple Hall current transformers, a first temperature sensor, a second temperature sensor, and a control center. Wherein, one Hall current transformer is arranged on the power transmission line of the motor corresponding to each roller of the strip hot rolling mill. One first temperature sensor is installed on the bearing end of each motor. One second temperature sensor is installed on the bearing end of each roller. The control center is electrically connected with the multiple Hall current transformers, the multiple first temperature sensors, and the second temperature sensor.

[0005] The first temperature sensor and the second temperature sensor are both wireless temperature sensors, the control center is provided with a wireless receiving unit adapted to the wireless temperature sensor, and the control center is wirelessly connected with the first temperature sensor and the second temperature sensor.

[0006] On the other hand, a method for preventing hot-rolled strip from being scratched on an output roller is provided, which is applicable to the device for preventing hot-rolled strip from being scratched on an output roller according to any one of the above embodiments. The method for preventing hot-rolled strip from being scratched on an output roller comprises:

[0007] Checking whether the surface of each roller of the strip hot rolling mill is scratched.

[0008] If yes, repairing the roller surface.

[0009] If no, obtaining the current size when the roller is normally running.

[0010] Collecting the current size of each roller way of the strip hot rolling mill when running, and comparing with the current of corresponding roller way when running normally, when the current of any roller way is greater than twice the average current of all roller ways, the roller way has an abnormality.

[0011] The difference of the current of the adjacent two roller ways is greater than 15%, and exceeds 10s, at least one of the adjacent two roller ways has an abnormality.

[0012] Collecting the first temperature of the bearing end of the motor and the second temperature of the bearing end of the roller way, comparing the first temperature and the second temperature with the reference temperature, when the first temperature and the second temperature differ from the reference temperature by more than N degrees, the corresponding roller way has an abnormality.

[0013] The reference temperature includes the regional standard temperature, the reference temperature in winter is 6 DEG C lower than the regional standard temperature, the reference temperature in summer is less than the regional standard temperature increased by 7 DEG C, and the reference temperature increases with the working time, and the temperature rise is 10 DEG C / h.

[0014] The beneficial effects of the present application are that:

[0015] The present application can detect the current size and surface temperature of each roller way, and through data collection and analysis, the running state of the corresponding roller way can be judged in time, so that the case that the roller way cannot be found in time due to abnormal operation can be avoided, and the surface of the strip can be prevented from being scratched. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the following will briefly introduce the drawings needed to be used in the embodiments or the related art descriptions. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor.

[0017] Figure 1 The structural diagram of the present application. EMBODIMENT

[0018] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0019] In the description of the present application, it needs to be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0020] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0021] The following is specifically illustrated by examples:

[0022] In one aspect, as Figure 1 shown, the present application provides a hot-rolled strip output roller 3 scratch detection device. The hot-rolled strip output roller 3 scratch detection device is arranged on a strip hot-rolling mill, and the hot-rolled strip output roller 3 scratch detection device comprises a plurality of Hall current transformers 1, a first temperature sensor 4, a second temperature sensor 6 and a control center 5. Among them, a Hall current transformer 1 is arranged on the power transmission line of the motor 2 corresponding to each roller 3 of the strip hot-rolling mill. A first temperature sensor 4 is installed on the bearing end of each motor 2. A second temperature sensor 6 is installed on the bearing end of each roller 3. The control center 5 is electrically connected with the plurality of Hall current transformers 1, the plurality of first temperature sensors 4 and the second temperature sensor 6.

[0023] The first temperature sensor 4 and the second temperature sensor 6 are both wireless temperature sensors, the control center 5 is provided with a wireless receiving unit adapted to the wireless temperature sensor, and the control center 5 is wirelessly connected with the first temperature sensor 4 and the second temperature sensor 6.

[0024] On the other hand, a method for preventing hot-rolled strip from being scratched on the output roller, the method for preventing hot-rolled strip from being scratched on the output roller is applicable to the device for preventing hot-rolled strip from being scratched on the output roller described in any of the above embodiments. The method for preventing hot-rolled strip from being scratched on the output roller comprises:

[0025] Check whether there is scratch on the surface of each roller of the strip hot-rolling mill.

[0026] If so, repair the roller surface.

[0027] If not, the current size of the roller table normal operation is obtained.

[0028] The current size of each roller table of the hot strip mill is collected and compared with the current of the corresponding roller table in normal operation. When the current of any roller table is greater than twice the average current of all roller tables, the roller table has an abnormality.

[0029] The difference between the currents of the two adjacent roller tables is greater than 15% and exceeds 10s, and at least one of the two adjacent roller tables has an abnormality.

[0030] The first temperature at the bearing end of the motor and the second temperature at the bearing end of the roller are collected, and the first temperature and the second temperature are compared with the reference temperature. When the first temperature and the second temperature differ from the reference temperature by more than N degrees, the corresponding roller has an abnormality.

[0031] The reference temperature includes the regional standard temperature, the reference temperature in winter is 6℃ lower than the regional standard temperature, the reference temperature in summer is less than 7℃ higher than the regional standard temperature, and the reference temperature increases with the working time, and the temperature rise is 10℃ / h.

[0032] The regional standard temperature can be the average temperature at the location of the hot rolling mill.

[0033] It should be noted that the maximum surface temperature of the roller varies according to the rolling specification, so the reference temperature cannot exceed the maximum surface temperature of the corresponding roller. For example, the maximum surface temperature of the hot rolling roller can be 500-700℃.

[0034] In addition, when the current of the roller appears the following situations, an alarm can be given. For example:

[0035] Instantaneous current is too high, no delay, no hysteresis (more than 2.5 times the rated current), and an ultra-high alarm can be given.

[0036] The current is higher than the normal upper limit (2 times the rated current of the motor), the delay is 2S, and the motor rated current is 5% hysteresis, and a high-high alarm can be given.

[0037] The current is greater than twice the current of the adjacent motor, the delay is 2S, and the motor rated current is 5% hysteresis, and a high alarm can be given.

[0038] The current is less than 0.5 times the current of the adjacent motor, the delay is 2S, and the motor rated current is 5% hysteresis, and a low alarm can be given.

[0039] The current is less than 30% of the rated current of the motor, the delay is 2S, and the motor rated current is 5% hysteresis, and a low-low alarm can be given.

[0040] According to the alarm situation, the worker can stop checking and handling the problem.

[0041] In the description of the present specification, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in an appropriate manner.

[0042] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An apparatus for preventing hot-rolled strip from being scratched on an output table, characterized in that, The device for preventing hot-rolled strip from being scratched on the output roller table is arranged on a hot strip rolling mill, and comprises: a plurality of Hall current transformers, one Hall current transformer being arranged on the power transmission line of the motor corresponding to each roller of the hot strip rolling mill; a first temperature sensor, one first temperature sensor being installed on the bearing end of each motor; a second temperature sensor, one second temperature sensor being installed on the bearing end of each roller; a control center, which is electrically connected with the plurality of Hall current transformers, the plurality of first temperature sensors and the second temperature sensors; the use method of the device comprises: checking whether the surface of each roller of the hot strip rolling mill is scratched; if yes, repairing the surface of the roller; if no, obtaining the current size of the roller in normal operation, collecting the current size of each roller of the hot strip rolling mill in operation, and comparing it with the current of the corresponding roller in normal operation, when the current of any roller is greater than twice the average current of all rollers, the roller is abnormal; the difference between the currents of two adjacent rollers is greater than 15%, and lasts for more than 10s, at least one of the two adjacent rollers is abnormal; collecting the first temperature of the motor bearing end and the second temperature of the roller bearing end, and comparing the first temperature and the second temperature with the reference temperature, when the first temperature and the second temperature differ from the reference temperature by more than N degrees, the corresponding roller is abnormal.

2. The device for preventing hot-rolled strip from being scratched on an output roller table according to claim 1, characterized in that, The first temperature sensor and the second temperature sensor are both wireless temperature sensors, the control center is provided with a wireless receiving unit adapted to the wireless temperature sensor, and the control center is wirelessly connected with the first temperature sensor and the second temperature sensor.

3. The device for preventing hot-rolled strip from being scratched on an output roller table according to claim 2, characterized in that, The reference temperature includes the regional standard temperature, the reference temperature in winter is 6℃ lower than the regional standard temperature, the reference temperature in summer is 7℃ higher than the regional standard temperature, and the reference temperature increases with the working time, with a temperature rise of 10℃ / h.

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