A method for detecting the center of gravity deviation of a slab before charging

Abstract

The application discloses a method for detecting the gravity center deflection of a slab before charging, and belongs to the technical field of automatic control of a steel rolling heating furnace. The method comprises the following steps: obtaining the torque of a roller motor when the roller motor is in a 0-speed torque state and the slab is kept still on the roller; calculating the unit slab weight torque based on the torque of the roller motor and the weight of the slab; comparing the calculated unit slab weight torque with a preset unit slab weight torque threshold value, determining the gravity center deflection degree of the slab, and grading the gravity center deflection degree of the slab; and when the gravity center of the slab is deflected, calculating the temperature of the roller motor in real time, and realizing the overheat protection of the roller motor. The application can prevent the sliding of the slab during the steel charging process and the mechanical damage of the furnace wall, has the characteristics of strong applicability and low cost, and can greatly improve the safety of the production process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automatic control of steel rolling heating furnace, in particular to a method for detecting the gravity center deviation of slab before charging. BACKGROUND

[0002] The heating furnace is an important part of the hot rolling production line of the steel plant, and its safe operation is the basis for ensuring the normal operation of the hot continuous rolling. If the gravity center of the slab to be heated by the heating furnace deviates, the slab may slide between the charging machine when entering the furnace, and may also slide when advancing in the heating furnace. In severe cases, it may cause mechanical damage to the furnace wall and result in engineering accidents. In addition, the gravity center deviation of the slab may cause the torque of the roller motor to abnormally increase, and the large amount of heat generated may cause the temperature of the motor to rise, which may cause damage to the motor. Therefore, the detection of the gravity center deviation of the slab is an important part of ensuring safe production. However, there is currently a lack of methods for detecting the gravity center deviation of the slab on the roller. SUMMARY

[0003] The present application provides a method for detecting the gravity center deviation of slab before charging, to solve the technical problem that there is currently a lack of a method for detecting the gravity center deviation of slab on the roller.

[0004] To solve the above technical problems, the present application provides the following technical solutions:

[0005] On the one hand, the present application provides a method for detecting the gravity center deviation of slab before charging, comprising:

[0006] When the roller motor is in a 0-speed torque state to keep the slab stationary on the roller, the torque of the roller motor is obtained;

[0007] Based on the torque of the roller motor and the weight of the slab, the unit slab weight torque is calculated;

[0008] The calculated unit slab weight torque is compared with a preset unit slab weight torque threshold value to determine the degree of gravity center deviation of the slab and classify the degree of gravity center deviation of the slab;

[0009] When the gravity center of the slab deviates, the temperature of the roller motor is calculated in real time to realize the overheat protection of the roller motor.

[0010] Further, the method for obtaining the torque of the roller motor comprises:

[0011] The current value and voltage value of the roller motor are obtained through a frequency converter, and the torque of the roller motor is calculated based on the current value and voltage value of the roller motor obtained by the frequency converter;

[0012] Or

[0013] The current value and voltage value of the roller motor are obtained by a current-voltage meter matched with the roller motor, and the torque of the roller motor is calculated according to the current value and voltage value of the roller motor obtained by the current-voltage meter.

[0014] Or

[0015] The torque of the roller motor is directly obtained by a torque sensor.

[0016] Further, the unit slab weight torque is calculated based on the torque of the roller motor and the slab weight, and the calculation comprises:

[0017] The average value of the torque of each roller motor in a certain time is calculated as the torque of the roller motor;

[0018] The sum of the torques of all roller motors is calculated;

[0019] The unit slab weight torque is calculated based on the sum of the torques of all roller motors and the slab weight.

[0020] Further, the calculation formula of the unit slab weight torque is:

[0021]

[0022] Wherein, M T is the unit slab weight torque; M i is the torque of the i-th roller motor, i=1, 2, …, x, x is the number of roller motors; sum{M1, M2, …, M x} represents the sum of the torques of all roller motors; and m is the slab weight.

[0023] Further, the calculated unit slab weight torque is compared with a preset unit slab weight torque threshold value to determine the slab center of gravity deviation degree and grade the slab center of gravity deviation degree, and the comparison comprises:

[0024] Four unit slab weight torque threshold values that increase in order are set: M a , M b , M c , and M d .

[0025] According to the following determination rules, the slab center of gravity deviation degree is determined and graded:

[0026]

[0027] Wherein, α represents the slab center of gravity deviation degree grade; and M T is the unit slab weight torque.

[0028] Further, when the value of alpha is 1, it indicates that the slab center of gravity skewness level is blue level; when the value of alpha is 2, it indicates that the slab center of gravity skewness level is yellow level; when the value of alpha is 3, it indicates that the slab center of gravity skewness level is orange level; when the value of alpha is 4, it indicates that the slab center of gravity skewness level is red level; wherein, for the slab with red level of center of gravity skewness, it is directly stopped into the furnace and the technical personnel is automatically notified for subsequent manual processing.

[0029] Further, the calculation formula of the roller motor temperature is:

[0030]

[0031] Wherein, T is the roller motor temperature; T0 is the initial value of the roller motor temperature; K is the roller motor power coefficient; t0 is the initial time when the slab is static on the roller; t1 is the real-time time when the slab is on the roller in the calculation of the roller motor temperature; U is the roller motor voltage value; I is the roller motor current value; t represents the time variable; C is the heat capacity of the roller motor; A is the heat dissipation coefficient of the roller motor; S is the surface heat dissipation area of the roller motor.

[0032] Further, the roller motor overheating protection is realized, comprising:

[0033] When the roller motor temperature is not less than the preset motor temperature threshold value, it is judged that the current roller motor is overheated, at this time, the "motor overheating" fault is reported and tripped;

[0034] When the roller motor temperature is less than the preset motor temperature threshold value, it is judged that the current roller motor is not overheated.

[0035] In still another aspect, the present application also provides an electronic device, comprising a processor and a memory; wherein the memory has at least one instruction stored therein, which is loaded and executed by the processor to realize the above-mentioned method.

[0036] In still another aspect, the present application also provides a computer readable storage medium, wherein the storage medium has at least one instruction stored therein, which is loaded and executed by the processor to realize the above-mentioned method.

[0037] The technical scheme provided by the present application solves the problem of slab center of gravity skewness detection without the need of adding detection devices, and can provide motor overheating protection function, greatly improving the safety in the production process. The beneficial effects brought by it at least include:

[0038] 1、The present application detects whether the slab center of gravity is skewed through the roller motor torque detection plate, realizes the control of the slab center of gravity skew, can prevent the slab from sliding during the steel loading process and the mechanical damage of the furnace wall, has strong application in the metallurgical engineering heating furnace, low cost, obvious effect, and greatly improves the safety in the production process.

[0039] 2、The roller motor in the application scene of the present application maintains the slab stationary while generating heat, and the present application calculates the motor temperature through heat integration, so that the motor overheating protection function can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0041] Figure 1 is a schematic diagram of the application scene of the present application;

[0042] Figure 2 is a method flowchart provided by the embodiment of the present application for detecting the slab center of gravity skew before charging;

[0043] Figure 3 is a system block diagram of the electronic device provided by the embodiment of the present application. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0045] First of all, it should be noted that in the embodiments of the present application, the words such as "exemplarily", "for example" are used to represent as an example, illustration or explanation. Any embodiment or design scheme described as "exemplary" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the word "exemplarily" is intended to present the concept in a specific way. In addition, in the embodiments of the present application, the meaning expressed by "and / or" can be both, or can be either one of the two.

[0046] First embodiment

[0047] The present embodiment provides a method for detecting the slab center of gravity skew before charging, and the application scene is as shown in Figure 1As shown, the center of gravity of the slab on the furnace entry roller table is detected to prevent mechanical damage to the furnace wall; the basic principle is that when the slab reaches the specified position, the furnace entry roller table is stationary, the roller motor remains powered, the frequency converter gives the motor a certain compensation output voltage, adjusts the motor flux to make it in 0-speed high torque state, if the center of gravity of the slab is skewed, a tendency to slide along the roller direction will be generated, at this time the frequency converter detects the speed and realizes dynamic balance through vector control, the voltage and current required by the roller motor will increase in this process, the degree of skew of the center of gravity of the slab can be judged by the abnormal increase of the motor torque per unit slab weight, therefore, the voltage and current of the roller motor are collected to calculate the motor torque, or the motor torque is directly obtained through the torque sensor, the skew degree is determined by comparing the torque per unit slab weight with the manually set torque per unit slab weight threshold, and the roller motor consumes electric energy mainly in the form of heat at 0-speed torque, which causes the motor temperature to rise, and the motor may be burned out in severe cases, therefore, the motor heat generation can be calculated to predict the motor temperature, and the motor overheat protection function can be provided for the motor to protect the motor.

[0048] The method can be implemented by an electronic device, and the execution flow of the method is as shown in Figure 2 The method comprises the following steps:

[0049] S1, when the roller motor is in a 0-speed torque state to keep the slab stationary on the roller, the roller motor torque is obtained;

[0050] It should be noted that when the slab reaches the specified position of the furnace entry roller table, the roller motor remains powered, the frequency converter provides a compensation voltage to the motor to maintain the motor stationary (i.e. 0-speed high torque state), increases the motor flux and excitation current, and keeps the slab stationary on the roller, at this time, the roller motor torque is obtained, i.e. the motor torque at 0-speed, and the slab center of gravity skew detection is based on this; the roller motor torque can be obtained in the following three ways:

[0051] a) obtain the current value and voltage value through the frequency converter to calculate the motor torque; b) obtain the current value and voltage value through the matching current and voltage meter to calculate the motor torque; c) directly obtain the motor torque through the torque sensor;

[0052] Of course, other ways of obtaining the roller motor torque can also be used, which are not limited in this embodiment.

[0053] S2, based on the roller motor torque and the slab weight, the torque per unit slab weight is calculated;

[0054] Specifically, in this embodiment, the calculation process of the torque per unit slab weight is as follows:

[0055] S21, in the high torque state of the roller motor 0 speed, the average torque of the motor in a certain time is obtained in real time, and the real-time torque of the load roller motor of the slab in the stopping time on the roller is obtained;

[0056] S22, the sum of all real-time torques of the load roller motor of the slab in the stopping time on the roller is calculated;

[0057] S23, the ratio of the sum of all real-time torques of the load roller motor of the slab in the stopping time on the roller to the slab mass is calculated as the unit slab weight torque M T , which is expressed by the formula:

[0058]

[0059] Where, M i is the torque of the i-th roller motor, i=1, 2, …, x, x is the number of roller motors; sum{} represents the summation formula; m represents the current slab weight for which the gravity center deviation is determined.

[0060] S3, compare the calculated unit slab weight torque with the preset unit slab weight torque threshold value, determine the gravity center deviation degree of the slab, and grade the gravity center deviation degree of the slab;

[0061] Specifically, in this embodiment, according to the actual measurement results on site, four unit slab weight torque threshold values M a , M b , M c , M d are set by manual, and the deviation degree is divided into red, orange, yellow and blue levels. Among them, the threshold value of the determination can be adjusted according to the customer feedback and the system determination result; the specific determination rule is as follows:

[0062]

[0063] Where, α represents the gravity center deviation degree level of the slab; M T is the unit slab weight torque. When the value of α is 1, it means that the gravity center deviation degree level of the slab is blue; when the value of α is 2, it means that the gravity center deviation degree level of the slab is yellow; when the value of α is 3, it means that the gravity center deviation degree level of the slab is orange; when the value of α is 4, it means that the gravity center deviation degree level of the slab is red; wherein, the gravity center determination result is directly output to the automatic system, and the slab with red level of gravity center deviation degree is directly stopped into the furnace, and the technical personnel are automatically notified for subsequent manual processing.

[0064] S4, when the gravity center of the slab deviates, the temperature of the roller motor is calculated in real time to realize the overheat protection of the roller motor;

[0065] It is to be noted that when the roller motor is in 0 speed state, the electric energy consumed by the roller motor is mainly converted into heat energy, at this time, the motor is easy to burn out, for this, the real-time roller motor temperature can be calculated by using the form of heat integral, when the motor temperature exceeds the overheating threshold, the corresponding overheating protection processing is executed. Specifically, when the slab center of gravity deviation occurs, that is, the calculated unit slab weight torque is greater than M a , the motor with the maximum current is taken to perform overheating protection calculation and judgment, and the specific implementation process is as follows:

[0066] According to the artificial experience, an initial value T0 of the load roller motor temperature, a power coefficient K of the load roller motor and a heat dissipation coefficient A of the load roller motor are given, and then the calculation formula of the roller motor temperature T is:

[0067]

[0068] Wherein, t0 is the initial time when the slab is stationary on the roller; t1 is the real-time time when the slab is located on the roller in the calculation of the roller motor temperature; U is the roller motor voltage value; I is the roller motor current value; t represents the time variable; C is the heat capacity of the roller motor, that is, the heat required for the motor to rise by 1 degree; S is the surface heat dissipation area of the roller motor; wherein, the values of T0, K and A can be adjusted according to customer feedback and system determination results.

[0069] Further, the motor overheating protection determination rule is:

[0070]

[0071] If β = 1, it is judged that the motor is overheating, at this time, the "motor overheating" fault trip is reported. Wherein, T represents the real-time calculated roller motor temperature; T β represents the threshold value for determining motor overheating, which can be specified by artificial.

[0072] In summary, the embodiment provides a method for detecting the center of gravity deviation of the slab before charging, which detects whether the center of gravity of the slab is deviated by the roller motor torque, realizes the control of the center of gravity deviation of the slab, prevents the sliding of the slab during the charging process and the mechanical damage of the furnace wall, at the same time, the motor temperature is calculated by the heat integral method, and the motor overheating protection function can be realized; applied in the metallurgical engineering heating furnace, which can greatly improve the safety in the production process.

[0073] Second embodiment

[0074] The embodiment takes an actual application example to illustrate the implementation process of the application, and the implementation steps are as follows:

[0075] Step one) when the slab reaches the designated position of the entry roller of the heating furnace, the roller motor remains powered, the frequency converter provides a compensation voltage to the motor to maintain the motor stationary (i.e. 0 speed high torque state), increase the motor flux and excitation current, at this time the real-time torque value M of the motor is directly obtained through the torque sensor i .

[0076] The following data application scenario is that 12 load roller motors of the entry roller of the heating furnace are controlled by the same frequency converter, the starting time is when the slab has a speed of 0 on the entry roller of the heating furnace, and three slab data are taken as examples for illustration, Table 1 lists the real-time torque data of the roller motors controlled by the same frequency converter when the slabs A, B and C are stationary on the entry roller.

[0077] Table 1 Real-time torque data of roller motors

[0078]

[0079] Step two) calculate the unit slab weight torque. The ratio of the sum of the torques of all load roller motors to the weight of the slab is taken as the unit slab weight torque, and the calculation formula is:

[0080]

[0081] Wherein, the masses m of the three slabs A, B and C are 19260 kg, 19220 kg and 19260 kg respectively, and the calculation results of the unit slab weight torque are shown in Table 2.

[0082] Table 2 Unit slab weight torque data

[0083]

[0084] Step three) determine the degree of center of gravity deviation of the slab. According to the actual measurement results on site, four unit slab weight torque thresholds 10x10 -3 N·m / kg, 20x10 -3 N·m / kg, 30x10 -3 N·m / kg, and α = 1, 2, 3, 4 correspond to the deviation levels of blue, yellow, orange and red respectively. The determination rule is:

[0085]

[0086] According to this determination rule, the slabs A, B and C belong to the blue, blue and yellow levels respectively, and the center of gravity of the slab has no obvious deviation, so the slab can be normally entered into the furnace. The center of gravity determination result is directly output to the automation system, and the torque related parameters of each slab are saved for subsequent threshold adjustment. If a slab with a red level of center of gravity deviation is found, the slab is directly stopped from entering the furnace and the technical personnel are automatically notified for subsequent manual processing.

[0087] Step four) take the motor with the largest current to carry out overheat protection calculation, the slab is stopped for 50s on the roller bed, and the measured motor current is shown in Table III.

[0088] Table III Real-time current value of roller motor

[0089]

[0090] According to the actual situation and artificial experience, an initial value of motor temperature is given as 40 DEG C, a power coefficient K = 1.38, a roller motor compensation voltage is 5%, and a motor heat capacity C is 0.161*10 6 J / K, a heat dissipation coefficient A = 19.4 W / (m 2 ·K), and a motor surface heat dissipation area S = 1.59 m 2 Therefore, the temperature calculation formula of the motor is as follows:

[0091]

[0092] The calculated real-time temperature of the motor is always 40 DEG C, the temperature rise is not more than 0.1 DEG C, the motor temperature is not more than the motor pre-warning temperature 70 DEG C, and the motor runs normally.

[0093] As can be seen from the above examples, the scheme can greatly improve the safety in the production process.

[0094] Third embodiment

[0095] The embodiment provides an electronic device, such as Figure 3 As shown in the figure, the electronic device comprises a processor and a memory; wherein the processor and the memory can be connected through a communication bus; the memory stores at least one instruction, the instruction is loaded and executed by the processor, so as to realize the method of the above-mentioned first embodiment. In addition, the electronic device can further comprise a transceiver, the processor and the transceiver can be connected through a communication bus, and the transceiver is used for communicating with other devices.

[0096] Next, combined with Figure 3 The various constituent components of the electronic device will be specifically introduced:

[0097] The processor is the control center of the electronic device. The electronic device can include multiple processors. Each of the processors can be a single-CPU or a multi-CPU. The processor can be one processor or a collective term of multiple processing elements. For example, the processor can be one or more central processing units (CPUs), other general purpose processors, application specific integrated circuits (ASICs), or one or more integrated circuits configured to implement one or more embodiments of the present application, such as one or more digital signal processors (DSPs), or one or more field programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The general purpose processor can be a microprocessor or any conventional processor, or the like. The processor can perform various functions of the electronic device by running or executing software programs stored in the memory and calling data stored in the memory.

[0098] In a specific implementation, as an embodiment, the processor can include one or more CPUs, such as CPU0 and CPU1 shown in FIG. 1, of course, this is only an exemplary description. Figure 3

[0099] The memory is used to store software programs for implementing the solution of the present application, and is controlled by the processor to perform the implementation. The specific implementation can refer to the method embodiments described above, and will not be described here.

[0100] ​Optionally, the memory may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited thereto. The memory may be integrated with the processor or may exist independently, and may be accessed through the interface circuit of the electronic device (…). Figure 3 (Not shown in the image) is coupled to the processor; however, this embodiment of the invention does not impose specific limitations on this.

[0101] The transceiver may include a receiver and a transmitter. Figure 3 (Not shown separately). The receiver is used to implement the receiving function, and the transmitter is used to implement the transmitting function. The transceiver can be integrated with the processor or exist independently, and is connected through the interface circuit of the electronic device (…). Figure 3 (Not shown in the image) is coupled to the processor, and this embodiment of the invention does not specifically limit this.

[0102] In addition, it should be noted that, Figure 3 The structure of the electronic device shown is not intended to limit the device. Actual devices may include more or fewer components than shown, or combine certain components, or have different component arrangements. Furthermore, the technical effects achieved by this electronic device when performing the method of the first embodiment described above can be referenced to the technical effects described in the first embodiment; therefore, they will not be repeated here.

[0103] Fourth embodiment

[0104] This embodiment provides a computer-readable storage medium storing at least one instruction, which is loaded and executed by a processor to implement the method of the first embodiment described above. The computer-readable storage medium may be a ROM, random access memory, CD-ROM, magnetic tape, floppy disk, or optical data storage device, etc. The instruction stored therein can be loaded and executed by a processor in a terminal.

[0105] Moreover, it should be noted that the present application can be provided as a method, an apparatus, or a computer program product. Therefore, the embodiments of the present application can take the form of an entirely or partially hardware embodiment, an entirely or partially software embodiment, or an embodiment combining software and hardware aspects. Furthermore, when implemented in software, the embodiments of the present application can take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, a computer diskette, an optical storage medium, a magnetic storage medium, and a semiconductor memory device). The computer program product includes one or more computer instructions that when loaded and executed by a computer, cause the computer to carry out the processes or functions described in the embodiments of the present application. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable apparatus. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, such as from a website, a computer, a server, or a data center to another website, computer, server, or data center through a wired (for example, infrared, wireless, microwave, or the like) manner. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, data center, or the like, including one or more collections of available media. The available media can be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium. The semiconductor medium can be a solid-state disk.

[0106] The embodiments of the present application are described with reference to flowcharts and / or block diagrams of the method, terminal device (system), and computer program product according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, an embedded processor, or other programmable data processing terminal device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate a device that implements the flowcharts and / or block diagrams. Figure 1 The flowcharts and / or block diagrams Figure 1 The device that implements the functions specified in one or more flows and / or blocks.

[0107] These computer program instructions can also be stored in a computer-readable storage medium that can direct the computer or other programmable data processing terminal device to work in a specific manner, so that the instructions stored in the computer-readable storage medium produce a manufactured product that includes instruction devices that implement the flowcharts and / or block diagrams. Figure 1 The flowcharts and / or block diagrams Figure 1the functions specified in the individual block or blocks. Such computer program instructions can also be loaded into a computer or other programmable data processing devices, so that a series of operational steps are performed on the computer or other programmable devices to generate a computer-implemented process, thus the instructions executed on the computer or other programmable devices provide a process for implementing the functions specified in the flowchart block(s). Figure 1 the functions specified in the individual block or blocks. Such computer program instructions can also be loaded into a computer or other programmable data processing devices, so that a series of operational steps are performed on the computer or other programmable devices to generate a computer-implemented process, thus the instructions executed on the computer or other programmable devices provide a process for implementing the functions specified in the flowchart block(s). Figure 1 the functions specified in the individual block or blocks. Such computer program instructions can also be loaded into a computer or other programmable data processing devices, so that a series of operational steps are performed on the computer or other programmable devices to generate a computer-implemented process, thus the instructions executed on the computer or other programmable devices provide a process for implementing the functions specified in the flowchart block(s).

[0108] It should also be noted that, in the present document, the terms such as first and second, etc. are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or terminal device. Without more limitations, the element defined by the statement "including a…", does not exclude the presence of other identical elements in the process, method, article or terminal device including the element. In addition, the term "and / or" is merely a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone, where A and B can be singular or plural. In addition, the character " / " in the present document generally represents an "or" relationship between the front and rear associated objects, but it can also represent an "and / or" relationship, which can be understood in the context before and after. "One or more" means one or more, and "multiple" means two or more. "At least one of the following" or similar expressions means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b or c can mean a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, and c can be single or multiple.

[0109] In addition, it can be understood that in various embodiments of the present application, the size of the sequence number of the above processes does not mean the order of execution, and the execution order of the processes should be determined by their functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0110] Those skilled in the art can appreciate that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be realized in electronic hardware or in a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solutions. Those skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0111] In several embodiments provided by the present application, it should be understood that the disclosed devices, apparatuses and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely schematic, for example, the division of functional modules / units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another device, or some features can be omitted or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed units can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms. The units described as separate components can be or can not be physically separated, and the components displayed as units can be or can not be physical units, that is, can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment. In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present, or two or more units can be integrated in one unit.

[0112] If the method is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or part of the technical solutions can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a plurality of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in the embodiments of the present application. The foregoing storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0113] Finally, it should be noted that the above description is only the preferred embodiment of the application, it should be pointed out that although the preferred embodiment of the application has been described, for those skilled in the art, once the basic creative concept of the application is known, several improvements and refinements can be made without departing from the principles of the application, and these improvements and refinements should also be considered as the protection scope of the application. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the application.

Claims

1. A method for detecting a center of gravity deviation of a slab before charging into a furnace, characterized by, The method comprises the following steps: When the roller motor is in a 0-speed torque state to keep the slab stationary on the roller, the torque of the roller motor is obtained; Based on the torque of the roller motor and the weight of the slab, the torque per unit slab weight is calculated; The calculated torque per unit slab weight is compared with a preset torque per unit slab weight threshold value to determine the degree of slab center of gravity deviation and grade the degree of slab center of gravity deviation; When the slab center of gravity deviates, the temperature of the roller motor is calculated in real time to realize overheat protection of the roller motor.

2. A method for detecting the off-centering of the gravity center of a slab before charging into a furnace as claimed in claim 1, characterized in that, The torque of the roller motor is obtained in the following ways: The current value and voltage value of the roller motor are obtained through a frequency converter, and the torque of the roller motor is calculated based on the current value and voltage value obtained by the frequency converter; Or The current value and voltage value of the roller motor are obtained through a current-voltage meter matched with the roller motor, and the torque of the roller motor is calculated based on the current value and voltage value obtained by the current-voltage meter; Or The torque of the roller motor is directly obtained through a torque sensor.

3. The method for detecting the center of gravity deviation of a slab before charging into a furnace according to Claim 1, wherein The calculation of the torque per unit slab weight based on the torque of the roller motor and the weight of the slab comprises the following steps: For each roller motor, the average torque of the roller motor within a certain time is calculated as the torque of the roller motor; The sum of the torques of all roller motors is calculated; Based on the sum of the torques of all roller motors, the torque per unit slab weight is calculated in combination with the weight of the slab.

4. The method for detecting the center of gravity deviation of a slab before charging into a furnace according to claim 3, wherein The calculation formula of the torque per unit slab weight is as follows: Wherein, M T is the unit plate weight torque; M i is the i-th roller motor torque, i = 1, 2, …, x, x is the number of roller motors; sum{M1, M2, …, M x} represents the sum of all roller motor torques; m is the slab weight.

5. The method for detecting the center of gravity deviation of a slab before charging into a furnace according to Claim 1, wherein The comparison of the calculated torque per unit slab weight with the preset torque per unit slab weight threshold value to determine the degree of slab center of gravity deviation and grade the degree of slab center of gravity deviation comprises the following steps: Four unit plate weight torque thresholds are set: M a , M b , M c , M d ; The degree of slab center of gravity deviation is determined and the degree of slab center of gravity deviation is graded according to the following determination rules: wherein a represents the slab center of gravity skew degree level; M T is the unit plate weight moment.

6. The method for detecting the center of gravity deviation of a slab before charging according to claim 5, wherein When the value of α is 1, it indicates that the degree of slab center of gravity deviation is in the blue level; When the value of α is 2, it indicates that the degree of slab center of gravity deviation is in the yellow level; When the value of α is 3, it indicates that the degree of slab center of gravity deviation is in the orange level; When the value of α is 4, it indicates that the degree of slab center of gravity deviation is in the red level; For the slab with the degree of center of gravity deviation in the red level, it is directly stopped from being charged and the technical personnel are automatically notified for subsequent manual processing.

7. The method for detecting the center of gravity deviation of a slab before charging into a furnace according to Claim 1, wherein The calculation formula of the temperature of the roller motor is as follows: Wherein, T is the temperature of the roller motor; T0 is the initial value of the temperature of the roller motor; K is the power coefficient of the roller motor; t0 is the initial time when the slab is stationary on the roller; t1 is the real-time time when the slab is on the roller during the calculation of the temperature of the roller motor; U is the voltage value of the roller motor; I is the current value of the roller motor; t represents the time variable; C is the heat capacity of the roller motor; A is the heat dissipation coefficient of the roller motor; S is the surface heat dissipation area of the roller motor.

8. The method for detecting the center of gravity deviation of a slab before charging into a furnace according to Claim 1, wherein The realization of the overheat protection of the roller motor comprises the following steps: When the temperature of the roller motor is not less than a preset motor temperature threshold value, it is determined that the current roller motor is overheated, at which time a "motor overheat" fault is reported and the roller motor is tripped; When the temperature of the roller motor is less than the preset motor temperature threshold value, it is determined that the current roller motor is not overheated.

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