Line difference detection method, device and equipment for bar and medium

Abstract

The invention provides a line difference detection method, device and equipment for a bar and a medium. The method comprises the steps that whether steel signals exist on all roller ways or not is detected, and all the roller ways are parallel roller ways between a cutting device and a crop shear device; if it is detected that a steel signal exists in a first roller way for the first time, it is determined that the first roller way is a reference roller way, a head differential speed integrator is started for roller way transportation speed integration, and the first roller way is any one of all the roller ways; if it is detected that a steel signal exists in a non-reference roller way except the reference roller way, the head line difference between the bar in the non-reference roller way and the bar in the reference roller way is determined on the basis of the value of the head difference speed integrator; and if each roller way detects a steel signal, closing the head differential velocity integrator. The head line difference can be monitored in real time, so that adjustment in advance is facilitated, and production quality accidents can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bar production in the steel industry, and in particular to a method and device for detecting the length difference of a bar, equipment and a medium. BACKGROUND

[0002] When using a slitting rolling process, the length difference of the two bars cut by the slitting wheel often exists due to factors such as slitting wheel deviation and rolling groove wear. This length difference makes it difficult to accurately cut off the head of the bar in the subsequent head cutting flying shear process. The uncut head is prone to cause a steel pile-up accident in the subsequent rolling. Therefore, accurately measuring the length difference of the bar is a problem to be solved. SUMMARY

[0003] The present application provides a method and device for detecting the length difference of a bar, equipment and a medium to accurately measure the length difference of the bar.

[0004] The present application provides a method for detecting the length difference of a bar, which comprises:

[0005] Respectively detecting whether there is a steel signal on each roller way, wherein the roller ways are parallel roller ways between a slitting device and a head cutting shear device;

[0006] If a steel signal is detected on a first roller way for the first time, the first roller way is determined as a reference roller way, and a head difference speed integrator is started to integrate the roller conveying speed, wherein the first roller way is any roller way in the roller ways;

[0007] If a steel signal is detected on a non-reference roller way except the reference roller way, a head length difference between the bar in the non-reference roller way and the bar in the reference roller way is determined based on the value of the head difference speed integrator;

[0008] If a steel signal is detected on each roller way, the head difference speed integrator is closed.

[0009] In an embodiment of the present application, after the steel signal on each roller way is detected, the method further comprises:

[0010] If the steel signal on a second roller way in the roller ways disappears, the reference roller way is updated to the second roller way, and a tail difference speed integrator is started to integrate the roller conveying speed, wherein the second roller way is any roller way in the roller ways;

[0011] If the steel signal on the non-reference roller way except the reference roller way disappears, a tail length difference between the bar in the non-reference roller way and the bar in the reference roller way is determined based on the value of the tail difference speed integrator;

[0012] If the steel signal disappears on each roller bed, the tail difference speed integrator is closed.

[0013] In an embodiment of the present application, after the head difference speed integrator is closed, the method further comprises:

[0014] If the head line difference is greater than a first threshold value, a first preset rule is used for alarm;

[0015] If the head line difference is greater than a second threshold value, a second preset rule is used for alarm, the second threshold value is greater than the first threshold value, and the alarm level corresponding to the second preset rule is greater than the alarm level corresponding to the first preset rule.

[0016] In an embodiment of the present application, after the tail difference speed integrator is closed, the method further comprises:

[0017] If the tail line difference is greater than a first threshold value, a first preset rule is used for alarm;

[0018] If the tail line difference is greater than a second threshold value, a second preset rule is used for alarm, the second threshold value is greater than the first threshold value, and the alarm level corresponding to the second preset rule is greater than the alarm level corresponding to the first preset rule.

[0019] In an embodiment of the present application, the alarm according to the first preset rule comprises triggering a yellow signal lamp to start;

[0020] The alarm according to the second preset rule comprises triggering a red signal lamp to start.

[0021] In an embodiment of the present application, the upper part of each roller bed is provided with a cold metal detector and a hot metal detector, and the cold metal detector and the hot metal detector are used to detect whether there is a steel signal on each roller bed, comprising:

[0022] The cold metal detector or the hot metal detector above each roller bed is used to detect whether there is a steel signal on each roller bed.

[0023] In an embodiment of the present application, each roller bed is provided with a shielded steel pipe in communication with the hot metal detector, and a compressed air blowing device is arranged in the shielded steel pipe.

[0024] The line difference detection device for a bar provided by the present application comprises:

[0025] A detection module is used to detect whether there is a steel signal on each roller bed, and the roller bed is a roller bed parallel between a cutting device and a head cutting device;

[0026] The first determining module is used for determining the first roller table as a reference roller table and starting a head difference speed integrator to perform roller table transportation speed integration if the first roller table is detected to have a steel signal for the first time, the first roller table being any one of the roller tables;

[0027] The second determining module is used for determining a head line difference between the bars in the non-reference roller table and the bars in the reference roller table based on the value of the head difference speed integrator if the non-reference roller table other than the reference roller table is detected to have a steel signal.

[0028] The first closing module is used for closing the head difference speed integrator if the steel signal is detected on each of the roller tables.

[0029] The electronic device provided by the application comprises:

[0030] One or more processors;

[0031] A storage device is used for storing one or more programs, when the one or more programs are executed by the one or more processors, the electronic device realizes the line difference detection method for the bars.

[0032] The computer readable storage medium provided by the application has a computer program stored thereon, when the computer program is executed by the processor of the computer, the computer executes the line difference detection method for the bars.

[0033] The application has the beneficial effects that the application respectively detects whether the steel signal exists on each roller table, determines the first roller table as a reference roller table and starts a head difference speed integrator to perform roller table transportation speed integration if the first roller table is detected to have a steel signal for the first time, and determines a head line difference between the bars in the non-reference roller table and the bars in the reference roller table based on the value of the head difference speed integrator if the non-reference roller table other than the reference roller table is detected to have a steel signal. It can be seen that the application can monitor the head line difference in real time, so as to adjust in advance, thereby being beneficial to reducing production quality accidents. BRIEF DESCRIPTION OF DRAWINGS

[0034] The drawings incorporated into the specification and constituting a part of the specification show embodiments consistent with the application and, together with the specification, serve to explain the principles of the application. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained according to the drawings without creative labor for those skilled in the art.

[0035] In the drawings:

[0036] Figure 1A flow chart of a line difference detection method for a bar is provided in an embodiment of the present application.

[0037] Figure 2 A block diagram of a line difference detection device for a bar is shown in an exemplary embodiment of the present application.

[0038] Figure 3 A structural diagram of a computer system of an electronic device suitable for implementing embodiments of the present application is shown. DETAILED DESCRIPTION

[0039] The present application can be further understood by the following detailed description of particular embodiments, taken in conjunction with the above-described drawings, in which like elements are numbered the same. Other advantages and novel features of the present application will become apparent from the following detailed description, from the drawings, and from the claims.

[0040] It is to be understood that the drawings are to be used only for illustrating the general structure of the present application and not for explaining the specific construction, shape, and size thereof, and that the actual construction, shape, and size of the components can be arbitrarily changed, and the layout of the components can be more complicated.

[0041] In the following description, numerous specific details are discussed in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to one of ordinary skill in the art that the embodiments of the present application can be practiced without these specific details. In other instances, well-known structures and devices are not described in detail in order to avoid obscuring the embodiments of the present application.

[0042] Reference will now be made to Figure 1 , Figure 1 A flow chart of a line difference detection method for a bar is provided in an embodiment of the present application. Figure 1 As shown in FIG. 1, in an exemplary embodiment, the line difference detection method for a bar includes steps S110 to S140, which are described in detail as follows.

[0043] In step S110, it is detected whether there is a steel signal on each roller table, which is a roller table parallel to the cutting device and the head cutting device.

[0044] In some embodiments, a cold metal detector and a hot metal detector can be arranged above (directly above or laterally above) each roller table. When the bar is transported to the detection area of the cold metal detector or the hot metal detector by the roller table, the cold metal detector or the hot metal detector can identify the steel signal. The boundaries of the detection areas of the cold metal detector or the hot metal detector arranged on each roller table are aligned. The cold metal detector is added to prevent the detection from being inaccurate due to the "black head" of the bar, thereby causing a large error in the calculation of the line difference.

[0045] In some embodiments, a shielded steel pipe in communication with the corresponding hot metal detector can also be arranged on each roller table to reduce the detection interference of the steel signal caused by the red light of the bar on the adjacent roller table. A compressed air purging device can also be arranged in the shielded pipe to reduce the detection interference of the steel signal caused by the red light of the high-temperature oxide scale.

[0046] In step S120, if the first roller table is detected to have a steel signal for the first time, the first roller table is determined as the reference roller table, and the head difference speed integrator is started to integrate the roller table transportation speed. The first roller table is any roller table of the roller tables.

[0047] The above steel signal can be read into the preset interrupt module, and then the head difference speed integrator is started to integrate the roller table transportation speed.

[0048] In step S130, if a non-reference roller table other than the reference roller table is detected to have a steel signal, the head line difference between the bar in the non-reference roller table and the bar in the reference roller table is determined based on the value of the head difference speed integrator.

[0049] This step can be repeatedly performed. Each time a non-reference roller table is detected to have a steel signal, the head line difference between the non-reference roller table and the reference roller table is determined based on the value of the current head difference speed integrator until the head line differences between all non-reference roller tables and the reference roller table are determined.

[0050] In step S140, if the steel signal is detected on each roller table, the head difference speed integrator is turned off.

[0051] After the steel signal is detected on each roller table, the head line differences between all non-reference roller tables and the reference roller table are determined, and then the head difference speed integrator can be turned off to stop the integration of the roller table transportation speed.

[0052] For ease of understanding, the technical solutions of the present application are described taking the roller tables including the A line and the B line as examples.

[0053] a. First, if the A line or the B line detects a steel signal, the interrupt module is read in.

[0054] b. The head difference speed integrator in the interrupt module (for example, the accumulation data block) starts to start the roll conveying speed integration until the A line and the B line have steel signals at the same time.

[0055] c. Based on the value of the head difference speed integrator, the head line difference between the A line and the B line can be determined.

[0056] Among them, if the A line triggers the head difference speed integrator to start, the head of the A line is longer, and vice versa, the head of the B line is longer.

[0057] In the embodiment of the application, the head line difference can be monitored in real time through the above steps, so as to adjust in advance, thereby facilitating the reduction of production quality accidents.

[0058] Optionally, after the head difference speed integrator is closed if the steel signal is detected on each roll, the method further comprises:

[0059] If the disappearance of the steel signal of the second roll in the rolls is detected, the reference roll is updated to the second roll, and the tail difference speed integrator is started to integrate the roll conveying speed, and the second roll is any roll in the rolls;

[0060] If the disappearance of the steel signal of the non-reference roll except the reference roll is detected, the tail line difference between the bar in the non-reference roll and the bar in the reference roll is determined based on the value of the tail difference speed integrator;

[0061] If the disappearance of the steel signal of each roll is detected, the tail difference speed integrator is closed.

[0062] After the disappearance of the steel signal on each roll is detected, the tail line difference between all non-reference rolls and the reference roll is determined, and then the tail difference speed integrator can be closed to stop the roll conveying speed integration.

[0063] In order to facilitate understanding, the technical solutions of the application are described taking the rolls including the A line and the B line as examples.

[0064] a. First, if the disappearance of the steel signal of the A line or the B line is detected, the tail difference speed integrator (for example, a new accumulation data block) is started to integrate the roll conveying speed until the steel signals of the A line and the B line disappear.

[0065] b. Based on the value of the tail difference speed integrator, the tail line difference between the A line and the B line can be determined.

[0066] Among them, if the A line triggers the tail difference speed integrator to start, the tail of the A line is shorter, and vice versa, the tail of the B line is shorter.

[0067] Through the above steps, the tail line difference can be monitored in real time, so as to adjust in advance and reduce production quality accidents.

[0068] Optionally, after the head difference speed integrator is closed, the method further comprises:

[0069] In the case that the head line difference is greater than a first threshold value, a first preset rule is followed to perform an alarm.

[0070] In the case that the head line difference is greater than a second threshold value, a second preset rule is followed to perform an alarm, the second threshold value is greater than the first threshold value, and an alarm level corresponding to the second preset rule is greater than an alarm level corresponding to the first preset rule.

[0071] The first threshold value is, for example, 100 mm, and the second threshold value is, for example, 300 mm. If the number of the roll tables is equal to 2, there is one value of the head line difference, and whether the alarm process is performed can be determined directly based on the head line difference. If the number of the roll tables is greater than 2, there are multiple values of the head line difference, and whether the alarm process is performed can be determined based on a maximum value of the multiple head line differences, that is, in the case that the maximum value of the multiple head line differences is greater than the first threshold value, the first preset rule is followed to perform an alarm, and so on.

[0072] In the embodiment of the application, the double threshold values, the first preset rule and the second preset rule can realize risk grading response.

[0073] Optionally, after the tail difference speed integrator is closed, the method further comprises:

[0074] In the case that the tail line difference is greater than a first threshold value, a first preset rule is followed to perform an alarm.

[0075] In the case that the tail line difference is greater than a second threshold value, a second preset rule is followed to perform an alarm, the second threshold value is greater than the first threshold value, and an alarm level corresponding to the second preset rule is greater than an alarm level corresponding to the first preset rule.

[0076] If the number of the roll tables is equal to 2, there is one value of the tail line difference, and whether the alarm process is performed can be determined directly based on the tail line difference. If the number of the roll tables is greater than 2, there are multiple values of the tail line difference, and whether the alarm process is performed can be determined based on a maximum value of the multiple tail line differences, that is, in the case that the maximum value of the multiple tail line differences is greater than the first threshold value, the first preset rule is followed to perform an alarm, and so on.

[0077] In the embodiment of the application, the double threshold values, the first preset rule and the second preset rule can realize risk grading response.

[0078] Optionally, the alarming according to the first preset rule comprises triggering a yellow signal lamp to start;

[0079] The alarming according to the second preset rule comprises triggering a red signal lamp to start.

[0080] The yellow signal lamp and the red signal lamp can be signal lamps of a human-machine interface (HMI) interface. The triggering of the yellow signal lamp to start can be triggering the yellow signal lamp to flash, and the triggering of the red signal lamp to start can be triggering the red signal lamp to flash.

[0081] The embodiment is configured as above, so that the staff can conveniently obtain the severity of the current line difference.

[0082] It should be understood that the size of the serial number of each step in the above embodiment does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiment of the present application.

[0083] Figure 2 is a block diagram of a line difference detection device for a bar according to an exemplary embodiment of the present application. As shown in Figure 2 The exemplary line difference detection device for a bar comprises:

[0084] a detection module configured to detect whether there is a steel signal on each roller way, wherein the roller ways are parallel roller ways between a slitting device and a head shear device;

[0085] a first determination module configured to determine a first roller way as a reference roller way and start a head difference speed integrator to integrate roller conveying speed if the first roller way is detected to have a steel signal for the first time, wherein the first roller way is any one of the roller ways;

[0086] a second determination module configured to determine a head line difference between a bar in a non-reference roller way and a bar in the reference roller way based on a value of the head difference speed integrator if the non-reference roller way is detected to have a steel signal in addition to the reference roller way;

[0087] a first closing module configured to close the head difference speed integrator if all the roller ways are detected to have a steel signal.

[0088] In an embodiment of the present application, the device further comprises:

[0089] a third determination module configured to update the reference roller way to a second roller way and start a tail difference speed integrator to integrate roller conveying speed if the steel signal of the second roller way among the roller ways is detected to disappear, wherein the second roller way is any one of the roller ways.

[0090] a fourth determining module, configured to determine a tail line difference between the bar in the non-reference roller table and the bar in the reference roller table based on a value of the tail difference speed integrator if the disappearance of the steel signal of the non-reference roller table except the reference roller table is checked;

[0091] a second closing module, configured to close the tail difference speed integrator if the disappearance of the steel signal is detected by each of the roller tables.

[0092] In an embodiment of the present application, the device further comprises an alarm module, which is configured to:

[0093] alarm according to a first preset rule when the head line difference is greater than a first threshold value;

[0094] alarm according to a second preset rule when the head line difference is greater than a second threshold value, the second threshold value being greater than the first threshold value, and the alarm level corresponding to the second preset rule being greater than the alarm level corresponding to the first preset rule.

[0095] In an embodiment of the present application, the alarm module is further configured to:

[0096] alarm according to a first preset rule when the tail line difference is greater than a first threshold value;

[0097] alarm according to a second preset rule when the tail line difference is greater than a second threshold value, the second threshold value being greater than the first threshold value, and the alarm level corresponding to the second preset rule being greater than the alarm level corresponding to the first preset rule.

[0098] In an embodiment of the present application, the alarm according to the first preset rule comprises triggering a yellow signal lamp to start;

[0099] the alarm according to the second preset rule comprises triggering a red signal lamp to start.

[0100] In an embodiment of the present application, the upper part of each of the roller tables is provided with a cold metal detector and a hot metal detector, and the detection module is specifically configured to:

[0101] detect whether there is a steel signal on each of the roller tables through the cold metal detector or the hot metal detector above each of the roller tables.

[0102] In an embodiment of the present application, each of the roller tables is provided with a shielded steel tube in communication with the hot metal detector, and the shielded steel tube is provided with a compressed air blowing device.

[0103] It should be noted that the device for detecting line difference of the rod provided in the above embodiment and the method for detecting line difference of the rod provided in the above embodiment belong to the same concept, wherein the specific manner in which each module and unit performs operations has been described in detail in the method embodiment, which will not be repeated here. The device for detecting line difference of the rod provided in the above embodiment can be divided into different functional modules according to the needs in actual application, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above, and this is not limited herein.

[0104] Embodiments of the present application also provide an electronic device, comprising: one or more processors; and a storage device storing one or more programs, which when executed by the one or more processors, cause the electronic device to implement the method for detecting line difference of the rod provided in each of the above embodiments.

[0105] Figure 3 The structural schematic diagram of a computer system of an electronic device suitable for implementing embodiments of the present application is shown. It should be noted that, Figure 3 The computer system 300 of the electronic device shown is only an example, and should not bring any limitation to the functions and use range of the embodiments of the present application.

[0106] As Figure 3 shown, the computer system 300 includes a central processing unit (CPU) 301, which can perform various appropriate actions and processes according to programs stored in a read-only memory (ROM) 302 or programs loaded from a storage portion 308 into a random access memory (RAM) 303, such as performing the method described in the above embodiments. In the RAM 303, various programs and data required for system operation are also stored. The CPU 301, the ROM 302, and the RAM 303 are connected to each other through a bus 304. An input / output (I / O) interface 305 is also connected to the bus 304.

[0107] The following components are connected to the I / O interface 305: an input part 306 including a keyboard, a mouse, etc.; an output part 307 including a display such as a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), etc., and a speaker, etc.; a storage part 308 including a hard disk, etc.; and a communication part 309 including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication part 309 performs communication processing via a network such as the Internet. A drive 310 is also connected to the I / O interface 305 as necessary. A removable medium 311 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc. is attached to the drive 310 as necessary, so that a computer program read out therefrom is installed in the storage part 308 as necessary.

[0108] In particular, the processes described above with reference to the flowcharts can be implemented as a computer software program according to embodiments of the present application. For example, embodiments of the present application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing a computer program for executing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via the communication part 309, and / or installed from the removable medium 311. When the computer program is executed by the central processing unit (CPU) 301, various functions defined in the system of the present application are executed.

[0109] It should be noted that the computer-readable medium in the embodiments of the present application can be a computer-readable signal medium or a computer-readable storage medium or any combination of the two. The computer-readable storage medium may, for example, be an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or apparatus, or any combination of the above. More specific examples of the computer-readable storage medium can include, but are not limited to, an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disk read-only memory (Compact Disc Read-Only Memory, CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, the computer-readable signal medium can include a data signal carried in a baseband or as a part of a carrier wave, which carries computer-readable computer programs. Such a propagated data signal can take on various forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. The computer-readable signal medium can also be any computer-readable medium other than the computer-readable storage medium, which can send, propagate, or transmit programs for use by or in connection with an instruction execution system, apparatus, or device. The computer programs contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, or the like, or any suitable combination of the above.

[0110] The flowcharts and block diagrams in the drawings illustrate the possible implementation architectures, functions, and operations of the systems, methods, and computer program products according to various embodiments of the present application. In the flowcharts or block diagrams, each block can represent a module, a program segment, or a part of code, which contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions noted in the blocks can occur in different orders than those noted in the drawings. For example, two blocks represented in succession can actually be executed substantially in parallel, and sometimes in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams or flowcharts, and the combination of blocks in the block diagrams or flowcharts, can be implemented by a dedicated hardware-based system that performs the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions.

[0111] The units described in the embodiments of the present application can be implemented in the form of software, or can be implemented in the form of hardware, or can be implemented in the form of a combination of software and hardware. The units described can also be arranged in a processor. In some cases, the names of the units do not constitute a limitation on the units themselves.

[0112] Another aspect of the present application also provides a computer readable storage medium having stored thereon a computer program, which, when executed by a processor of a computer, causes the computer to perform the method for detecting a line difference of a bar as described above. The computer readable storage medium can be included in the electronic device described in the above embodiments, or can exist separately and not be assembled into the electronic device.

[0113] Another aspect of the present application also provides a computer program product or a computer program, which includes computer instructions stored in a computer readable storage medium. A processor of a computer device reads the computer instructions from the computer readable storage medium, and the processor executes the computer instructions, so that the computer device performs the method for detecting a line difference of a bar provided in the above embodiments.

[0114] The above embodiments only illustrate the principles and effects of the present application, but are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas of the present application should be covered by the claims of the present application.

Claims

1. A method for detecting linear difference in bar stock, characterized in that, The method includes: The presence of steel signals is detected on each roller conveyor, which is a parallel roller conveyor between the slitting device and the head shearing device. If a steel signal is detected for the first time on the first roller conveyor, the first roller conveyor is determined to be the reference roller conveyor, and the head differential speed integrator is activated to integrate the conveyor transport speed. The first roller conveyor is any one of the roller conveyors. If a steel signal is detected on a non-reference roller table other than the reference roller table, the head line difference between the bar in the non-reference roller table and the bar in the reference roller table is determined based on the value of the head differential speed integrator. If a steel signal is detected on each of the roller conveyors, the head differential speed integrator is turned off.

2. The method for detecting linear difference in bars according to claim 1, characterized in that, If steel signals are detected on all the roller conveyors, and the head differential speed integrator is turned off, the method further includes: If the steel signal of the second roller in each of the roller tracks disappears, the reference roller track is updated to the second roller track, and the tail differential speed integrator is started to integrate the roller track transport speed. The second roller track is any one of the roller tracks. If the steel signal disappears from the non-reference rollers other than the reference rollers, the tail line difference between the bars in the non-reference rollers and the bars in the reference rollers is determined based on the value of the tail differential speed integrator. If the steel signal disappears in all of the roller conveyors, the tail differential speed integrator is turned off.

3. The method for detecting linear difference in bars according to claim 1, characterized in that, After shutting down the head differential velocity integrator, the method further includes: If the head line difference is greater than the first threshold, an alarm is triggered according to the first preset rule; If the head line difference is greater than the second threshold, an alarm is triggered according to the second preset rule. The second threshold is greater than the first threshold, and the alarm level corresponding to the second preset rule is greater than the alarm level corresponding to the first preset rule.

4. The method for detecting linear difference in bars according to claim 2, characterized in that, After shutting down the tail differential velocity integrator, the method further includes: If the tail line difference is greater than the first threshold, an alarm is triggered according to the first preset rule; If the tail line difference is greater than the second threshold, an alarm is triggered according to the second preset rule. The second threshold is greater than the first threshold, and the alarm level corresponding to the second preset rule is greater than the alarm level corresponding to the first preset rule.

5. The method for detecting linear difference in bars according to claim 3 or 4, characterized in that, The alarm is triggered according to the first preset rule, including activating the yellow signal light. The alarm is triggered according to the second preset rule, including activating the red signal light.

6. The method for detecting linear difference in bars according to claim 1, characterized in that, Each roller conveyor is equipped with a cold metal detector and a hot metal detector. The detection of whether there is a steel signal on each roller conveyor includes: The presence of steel signals on each roller conveyor is detected by the cold metal detector or the hot metal detector located above each roller conveyor.

7. The method for detecting linear difference in bars according to claim 6, characterized in that, Each roller conveyor is equipped with a shielded steel pipe connected to the hot metal detector, and the shielded steel pipe is equipped with a compressed air purging device.

8. A linear difference detection device for bars, characterized in that, include: The detection module is used to detect whether there is a steel signal on each roller conveyor, wherein each roller conveyor is a parallel roller conveyor between the slitting device and the head cutting shear device; The first determining module is used to determine the first roller as a reference roller if a steel signal is detected for the first time, and to start the head differential speed integrator to integrate the roller conveying speed. The first roller is any one of the rollers. The second determining module is used to determine the head line difference between the bar in the non-reference roller and the bar in the reference roller based on the value of the head differential speed integrator if a steel signal is detected in a non-reference roller other than the reference roller. The first shutdown module is used to shut down the head differential speed integrator if a steel signal is detected in each of the roller conveyors.

9. A device, characterized in that, include: One or more processors and memory, The memory stores a computer program that, when executed by the one or more processors, causes the device to perform the linear difference detection method for bars as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, It stores a computer program that, when executed by one or more processors, causes the device to perform the linear difference detection method for bars as described in any one of claims 1-7.

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