Fault diagnosis method and system for withdrawal and straightening machine of bloom continuous casting machine

Abstract

The invention provides a bloom continuous casting machine withdrawal and straightening machine fault diagnosis method and system, and belongs to the technical field of bloom continuous casting machine withdrawal and straightening machine fault diagnosis. The fault diagnosis method comprises a single test and a single flow test, and three working modes of a soft reduction mode, a dummy ingot pressing mode and a hot blank pressing mode are set according to different working pressures of a withdrawal and straightening machine; judging whether the withdrawal and straightening machine is abnormal or not according to the displacement change and change speed of the withdrawal and straightening machine; according to the single-flow test, the withdrawal and straightening machines of the flow can be tested one by one in sequence, and the single-flow test is adopted to assist troubleshooting after abnormity is found, so that the test time is greatly saved, the problem that the hydraulic valve cannot be tested in a soft pressing mode is solved, the equipment abnormity is eliminated in the bud, the equipment failure rate is reduced, the equipment reliability is improved, and the test efficiency is improved. And the stable production sequence is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of fault diagnosis of a straightening machine of a large square billet continuous casting machine, and more specifically, relates to a fault diagnosis method and system for a straightening machine of a large square billet continuous casting machine. Background Art

[0002] With the fierce competition in the steel market economy, the requirements for product quality are increasing, and higher requirements are put forward for equipment accuracy and automation. For the online fault diagnosis of large square billet continuous casting machine, the existing technology usually tests the switch manually on the on-site operating table. Due to the large number of hydraulic valves and sensors, the test takes a long time. One person needs to observe on-site and direct another person to operate by phone. Test the "lifting" and "pressing down" actions of each straightening machine in the ingot pressing mode and the "lifting" and "pressing down" actions in the hot billet pressing mode. For example, 5 streams and a total of 50 straightening machines need to be checked and judged one by one, which is very cumbersome and takes at least 1 hour to complete. In addition, only the pressure selection reversing valve and lifting reversing valve can be tested. For the "light pressure down" enabling reversing valve and lifting reversing valve, there is generally no operating table to test. Therefore, due to inadequate testing, forgetting or incomplete testing, it often leads to valve jamming, displacement signal loss, line damage, pressure abnormality, etc. after production. Faults such as abnormal pressure, which affect the use of the "light pressure down" function, or even fail to produce, seriously affecting production stability. Summary of the invention

[0003] The purpose of the present invention is to provide a method and system for diagnosing faults of a straightening machine of a large square billet continuous casting machine, so as to solve the technical problem of difficulty in manual testing of the straightening machine of a large square billet continuous casting machine in the prior art.

[0004] In order to achieve the above-mentioned object, in a first aspect, the present invention provides a method for diagnosing a fault of a billet continuous casting machine straightening machine, the method comprising a single machine test and a single stream test;

[0005] The single-stream test includes: performing the single-unit test on all the tension and leveling machines in one stream one by one;

[0006] The single unit test comprises the following steps:

[0007] S1: Determine whether the selected working mode includes the light pressing mode, if yes, proceed to S1.1, otherwise proceed to S2;

[0008] S1.1: Control the straightening machine to perform forward movement in the light pressure mode, stop after the first set time t1 seconds, and judge whether the displacement change of the straightening roller reaches the set displacement requirement. If yes, proceed to S1.2, otherwise it is judged as a light pressure fault and the diagnosis ends;

[0009] S1.2: Control the tensioning and straightening machine to perform reverse action in the light pressure mode, stop after the first set time t1 seconds, and judge whether the displacement change of the tensioning and straightening roller reaches the set displacement requirement. If yes, proceed to S2, otherwise it is judged as a light pressure fault and the diagnosis ends;

[0010] S2: Determine whether the currently selected working mode includes the ingot pressure mode, if yes, proceed to S2.1, otherwise proceed to S3;

[0011] S2.1: Control the straightening machine to perform forward action in the ingot pressure mode, stop after the second set time t2 seconds, and judge whether the displacement change of the straightening roller reaches the set displacement requirement. If yes, proceed to S2.2, otherwise it is determined that the ingot pressure is faulty and the diagnosis ends;

[0012] S2.2: Control the straightening machine to reverse the ingot pressure mode, stop after the second set time t2 seconds, and judge whether the displacement change of the straightening roller reaches the set displacement requirement. If yes, proceed to S3, otherwise it is judged that the ingot pressure is faulty and the diagnosis ends;

[0013] S3: Determine whether the currently selected working mode includes the hot billet pressing mode. If yes, proceed to S3.1. Otherwise, determine that the straightening machine is normal and the diagnosis ends.

[0014] S3.1: Control the straightening machine to enter the hot billet pressing mode and move forward. Stop after the third set time t3 seconds. Determine whether the displacement change of the straightening roller reaches the set displacement requirement. If yes, proceed to S3.2. Otherwise, determine that the hot billet pressing mode is faulty and the diagnosis ends.

[0015] S3.2: Control the straightening machine to enter the hot billet pressing mode and move in reverse, stop after the third set time t3 seconds, and judge whether the displacement change of the straightening roller reaches the set displacement requirement. If so, the straightening machine is judged to be normal, otherwise, the hot billet pressing is judged to be faulty and the diagnosis ends.

[0016] Furthermore, the fault diagnosis method also includes a one-button test.

[0017] The one-button test includes the following steps:

[0018] The single test is performed on all the straightening machines in each flow, one by one, and multiple flows are performed simultaneously.

[0019] In a second aspect, the present invention provides a fault diagnosis system for a billet continuous casting machine straightening machine, the fault diagnosis system comprising:

[0020] Displacement sensor, used to measure the displacement information of the straightening machine;

[0021] A controller, used to control the working mode of the straightening machine and receive the displacement information of the straightening machine measured by the displacement sensor, wherein the controller stores a fault diagnosis program, and the fault diagnosis program is used to execute the first aspect of the method for diagnosing the straightening machine fault of the billet continuous casting machine to perform fault diagnosis;

[0022] The human-computer interaction system includes at least one human-computer interaction interface connected to the controller and used for inputting control instructions to the controller and displaying fault diagnosis information.

[0023] The controller is a PLC;

[0024] The fault diagnosis program includes a main program, a first subprogram and a second subprogram;

[0025] The main program is used for parameter setting, data collection, and calling the first subprogram and the second subprogram;

[0026] The first subroutine is used for overall motion control of each tension and straightening machine, output of diagnostic results and calling of the second subroutine;

[0027] The second subroutine is used for the lifting and lowering motion control and fault diagnosis of each tension and straightening machine.

[0028] Furthermore, the human-computer interaction system includes a plurality of human-computer interaction interfaces, and the plurality of human-computer interaction interfaces are respectively arranged at different locations.

[0029] Furthermore, the human-computer interaction interface includes a plurality of flow sub-interfaces, each of which includes: a mode selection box, a start button, a stop button, and a plurality of identical tension and straightening machine monitoring diagrams;

[0030] The mode selection box is used to single-select or double-select the working mode of the current flow, including a light pressing selection box, a starter pressing selection box and a hot billet pressing selection box;

[0031] The start button is used to send a single-stream test instruction to the controller;

[0032] The stop button is used to send a stop test instruction to the controller;

[0033] The plurality of tensioning and straightening machine monitoring diagrams correspond one to one with the plurality of tensioning and straightening machines, and are used to display the normal or fault status of each tensioning and straightening machine.

[0034] Furthermore, the monitoring diagram of the tension and straightening machine also includes an ascending button, a descending button, a hot billet pressing button, a starter pressing button and a light pressing button;

[0035] The hot billet pressing button, the starter ingot pressing button and the light press button are used to select the working mode of the single test;

[0036] The up button and the down button are used to send a forward action instruction or a reverse action instruction to the controller.

[0037] Furthermore, the human-computer interaction interface also includes a one-key start-stop button, which is used to send a one-key test instruction and a stop test instruction to the controller. The one-key test instruction is used to execute a single test on all the tensioning and straightening machines in each flow, and multiple flows are carried out simultaneously.

[0038] Furthermore, the controller communicates with the human-computer interaction system via Ethernet.

[0039] The beneficial effects of the present invention are as follows: the present invention provides a method and system for diagnosing faults of a straightening machine of a large square billet continuous casting machine, the fault diagnosis method comprising a single-unit test and a single-stream test, three working modes of a light pressure-down mode, an ingot-leading pressure mode and a hot billet-pressing mode are provided according to different working pressures of the straightening machine, and whether the straightening machine is abnormal is judged according to the displacement change and the speed of change of the straightening machine; the single-stream test can test the straightening machines of this stream one by one in sequence, and after an abnormality is found, a single-unit test is used to assist in troubleshooting, which not only greatly saves the testing time, but also solves the problem that the hydraulic valve in the light pressure-down mode cannot be tested, eliminates equipment abnormalities in the bud, reduces the equipment failure rate, improves the equipment reliability, and ensures a stable production sequence.

[0040] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0042] Figure 1 A flow chart of a method for diagnosing faults of a billet continuous casting machine straightening machine according to an embodiment of the present invention is shown.

[0043] Figure 2 A schematic diagram of a fault diagnosis system for a billet continuous casting machine straightening machine according to an embodiment of the present invention is shown.

[0044] Figure 3 A schematic diagram of a human-computer interaction interface according to an embodiment of the present invention is shown.

[0045] Figure 4 A schematic diagram of a mode selection box, a start button, and a stop button according to an embodiment of the present invention is shown.

[0046] Figure 5A schematic diagram of displaying fault diagnosis information according to an embodiment of the present invention is shown.

[0047] Figure 6 A schematic diagram of a monitoring diagram of a tension and straightening machine according to an embodiment of the present invention is shown.

[0048] Figure 7 A schematic diagram of each flow stop button and a one-key start / stop button according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0049] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0050] Embodiment 1:

[0051] See also Figure 1 , the embodiment of the present disclosure provides a method for diagnosing a fault of a billet continuous casting machine straightening machine, the method comprising a single machine test and a single stream test;

[0052] The single-stream test includes: performing the single-unit test on all the tension and leveling machines in one stream one by one;

[0053] The single unit test comprises the following steps:

[0054] S1: Determine whether the selected working mode includes the light pressing mode, if yes, proceed to S1.1, otherwise proceed to S2;

[0055] S1.1: Control the straightening machine to perform forward movement in the light pressure mode, stop after the first set time t1 seconds, and judge whether the displacement change of the straightening roller reaches the set displacement requirement. If yes, proceed to S1.2, otherwise it is judged as a light pressure fault and the diagnosis ends;

[0056] S1.2: Control the tensioning and straightening machine to perform reverse action in the light pressure mode, stop after the first set time t1 seconds, and judge whether the displacement change of the tensioning and straightening roller reaches the set displacement requirement. If yes, proceed to S2, otherwise it is judged as a light pressure fault and the diagnosis ends;

[0057] S2: Determine whether the currently selected working mode includes the ingot pressure mode, if yes, proceed to S2.1, otherwise proceed to S3;

[0058] S2.1: Control the straightening machine to perform forward action in the ingot pressure mode, stop after the second set time t2 seconds, and judge whether the displacement change of the straightening roller reaches the set displacement requirement. If yes, proceed to S2.2, otherwise it is determined that the ingot pressure is faulty and the diagnosis ends;

[0059] S2.2: Control the straightening machine to reverse the ingot pressure mode, stop after the second set time t2 seconds, and judge whether the displacement change of the straightening roller reaches the set displacement requirement. If yes, proceed to S3, otherwise it is judged that the ingot pressure is faulty and the diagnosis ends;

[0060] S3: Determine whether the currently selected working mode includes the hot billet pressing mode. If yes, proceed to S3.1. Otherwise, determine that the straightening machine is normal and the diagnosis ends.

[0061] S3.1: Control the straightening machine to enter the hot billet pressing mode and move forward, stop after the third set time t3 seconds, and judge whether the displacement change of the straightening roller reaches the set displacement requirement. If yes, proceed to S3.2, otherwise it is judged that the hot billet pressing mode is faulty and the diagnosis ends;

[0062] S3.2: Control the straightening machine to enter the hot billet pressing mode and move in reverse, stop after the third set time t3 seconds, and judge whether the displacement change of the straightening roller reaches the set displacement requirement. If so, the straightening machine is judged to be normal, otherwise, the hot billet pressing is judged to be faulty and the diagnosis ends.

[0063] Specifically, three working modes are set according to the different working pressures of the straightening machine, namely, light pressure mode, ingot pressure mode and hot billet pressure mode. Whether the straightening machine is abnormal is judged according to the displacement change and change speed of the straightening machine. When the test conditions are met, after starting the single-stream test, the straightening machines of this stream are tested one by one in sequence. If any abnormality is found, a targeted manual test is performed on a single machine. The lifting or switching mode of a single straightening machine can be flexibly controlled for testing to assist in troubleshooting. This not only greatly saves testing time, but also solves the problem that the hydraulic valve in the light pressure mode cannot be tested, eliminates equipment abnormalities in the bud, reduces equipment failure rate, improves equipment reliability, and ensures a stable production sequence.

[0064] Optionally, the fault diagnosis method further includes a one-button test.

[0065] The one-button test includes the following steps:

[0066] The single test is performed on all the straightening machines in each flow, one by one, and multiple flows are performed simultaneously.

[0067] Specifically, when the test conditions are met and the one-key test is started, all flows are automatically tested one by one starting from the first straightening machine, further saving test time.

[0068] Embodiment 2:

[0069] The present disclosure provides a fault diagnosis system for a billet continuous casting machine straightening machine, the fault diagnosis system comprising:

[0070] Displacement sensor, used to measure the displacement information of the straightening machine;

[0071] A controller, used to control the working mode of the straightening machine and receive the displacement information of the straightening machine measured by the displacement sensor, wherein the controller stores a fault diagnosis program, and the fault diagnosis program is used to execute the method for diagnosing the straightening machine fault of the billet continuous casting machine of the first embodiment to perform fault diagnosis;

[0072] The human-computer interaction system includes at least one human-computer interaction interface connected to the controller and used for inputting control instructions to the controller and displaying fault diagnosis information.

[0073] Specifically, this embodiment adopts a controller and a human-computer interaction system to realize one-button testing and intelligent diagnosis functions. The controller controls the lifting and lowering action of the cylinder of the straightening machine in three different working modes, and then diagnoses whether the corresponding hydraulic valve or its circuit, displacement sensor or its circuit is normal according to the changing direction and speed of the displacement (roller gap) of the straightening machine. Only one person is required to operate it, and only very little operation is needed to automatically complete all tests in a short time, and the diagnosis results are displayed on the interface, which is clear at a glance, greatly saving production time and manpower, making testing extremely simple, and ultimately reducing equipment failure rate, improving equipment stability, and ensuring stable and smooth production.

[0074] Preferably, the controller is a PLC;

[0075] The fault diagnosis program includes a main program, a first subprogram and a second subprogram;

[0076] The main program is used for parameter setting, data collection, and calling the first subprogram and the second subprogram;

[0077] The first subroutine is used for overall motion control of each tension and straightening machine, output of diagnostic results and calling of the second subroutine;

[0078] The second subroutine is used for the lifting and lowering motion control and fault diagnosis of each tension and straightening machine.

[0079] Preferably, the human-computer interaction system comprises a plurality of human-computer interaction interfaces, and the plurality of human-computer interaction interfaces are respectively arranged at different locations.

[0080] Specifically, according to different test locations, multiple human-computer interaction interfaces are set up to facilitate personnel operation.

[0081] Preferably, the human-computer interaction interface includes a plurality of flow sub-interfaces, each of which includes: a mode selection box, a start button, a stop button, and a plurality of identical tension and straightening machine monitoring diagrams;

[0082] The mode selection box is used to single-select or double-select the working mode of the current flow, including a light pressing selection box, a starter pressing selection box and a hot billet pressing selection box;

[0083] The start button is used to send a single-stream test instruction to the controller;

[0084] The stop button is used to send a stop test instruction to the controller;

[0085] The plurality of tensioning and straightening machine monitoring diagrams correspond one to one with the plurality of tensioning and straightening machines, and are used to display the normal or fault status of each tensioning and straightening machine.

[0086] Specifically, the human-machine interaction interface has the advantage of simple operation. After on-site confirmation, it can be started with one key on the human-machine interaction interface for automatic diagnosis, without the need for cooperation of multiple people, and only one person is required to operate. It also has the advantage of clear test results, which are all displayed on one interface, making them clear at a glance.

[0087] Furthermore, the monitoring diagram of the tension and straightening machine also includes an ascending button, a descending button, a hot billet pressing button, a starter pressing button and a light pressing button;

[0088] The hot billet pressing button, the starter ingot pressing button and the light press button are used to select the working mode of the single test;

[0089] The up button and the down button are used to send a forward action instruction or a reverse action instruction to the controller.

[0090] Specifically, the monitoring diagram of the straightening machine is mainly used for further confirmation of faults and single-unit testing after fault handling. The mode button of each straightening machine also has 3 modes that can be switched through the three buttons below. Displaying "hot" means it is in hot billet pressing mode, displaying "leading" means it is in ingot pressing mode, and displaying "light" means it is in "light pressing" mode. In different modes, you can click the "up" or "down" button to test the action, and judge whether the action is normal by whether the roll gap value changes and the speed of change.

[0091] Optionally, the human-computer interaction interface also includes a one-key start-stop button, which is used to send a one-key test instruction and a stop test instruction to the controller. The one-key test instruction is used to execute a single test on all the tensioning and straightening machines in each flow, and multiple flows are carried out simultaneously.

[0092] Specifically, after the test conditions are confirmed on site, they can be started with one button on the human-computer interaction system for automatic diagnosis, without the need for cooperation from multiple people, and only one person can operate it.

[0093] Optionally, the controller communicates with the human-computer interaction system via Ethernet.

[0094] Embodiment three:

[0095] The disclosed embodiment provides a fault diagnosis system for a straightening machine of a large square billet continuous casting machine. The large square billet continuous casting machine has 5 streams, each stream has 10 straightening machines, and the fault diagnosis system uses PLC to collect and control the relevant process data of the casting machine, adopts a modular design concept, designs different functions into different program blocks, and performs parameter setting and data exchange through the block external interface, which is convenient for program transplantation and reading; uses Wincc configuration software to compile a corresponding human-computer interaction interface, and loads it into the human-computer interaction system to display and operate data.

[0096] The PLC controls the lifting and lowering of the cylinder of the straightening machine in different working modes (light pressure mode, ingot pressure mode, hot billet pressure mode), and then diagnoses whether the corresponding hydraulic valve or its circuit, displacement sensor or its circuit are normal according to the change direction and speed of the displacement (roller gap) of the straightening machine, and displays the results through the human-computer interaction interface. It is designed in two modes: automatic and manual. The automatic mode is divided into one-button test and single-flow test. The test mode can be flexibly selected according to production needs. Each test process is lifted and lowered according to the selected test mode, and the hydraulic valve or displacement sensor and other equipment are diagnosed according to the feedback of the displacement.

[0097] like Figure 1 As shown, the diagnostic process includes the following steps:

[0098] Light pressure mode: after starting, first determine whether to use the "light pressure mode". If not, proceed to the next step of "ingot pressure mode". If yes, start the light pressure enabling valve, and determine whether to start the rising or falling light pressure reversing valve according to the roll gap state. Stop after a certain time t seconds. After heating, determine whether the displacement change ΔS of the straightening roller reaches the set displacement d. If not, it means an abnormality occurs and the diagnosis ends. If the set displacement requirement can be reached, the opposite direction action will be started and the above judgment process will be continued. If it is also normal, proceed to the next step of "ingot pressure mode" test;

[0099] Ingot pressure mode: First determine whether to use the "ingot pressure mode". If not, proceed to the next step of "hot billet pressure mode" diagnosis. If yes, enable the ingot pressure related hydraulic valves and perform action test. The test process is similar to the "light pressure mode". If an abnormality occurs, the diagnosis is terminated. If the lifting and lowering are normal, proceed to the next step of "hot billet pressure mode" test.

[0100] Hot billet pressing mode: First determine whether the "hot billet pressing mode" is selected. If not, end the diagnosis. If yes, start the hydraulic valve related to the "hot billet pressing mode" to perform lifting and lowering action test. The test process is similar to the "light pressing mode";

[0101] Diagnostic results: After the test, if there is no abnormality in all selected modes, the diagnostic result is normal. If any abnormality occurs, the diagnostic result is abnormal, and records are made and the diagnostic results are displayed. Then, the diagnostic process of the next tension and straightening machine is entered, and the diagnostic process is repeated until the last tension and straightening machine is diagnosed or it is manually stopped in the middle.

[0102] like Figure 2 As shown in the figure, the controller hardware uses Siemens 400PLC of each flow of the original casting machine. The fault diagnosis program mainly includes three parts of the control program, namely a main program and two nested subprograms with different functions. The main program FC371 is used for parameter setting, data acquisition, calling each subprogram and other functions, and uses the shared data block DB371 to store data; the subprogram FB371 is used for the action output and fault diagnosis of the straightening machine, which is nested in FB372 and called by FB372; the subprogram FB372 is used for the overall action control and result output of each straightening machine, and uses the background data blocks DB372~DB381 to store data respectively. The PLC communicates with the human-computer interaction system through Ethernet, and three human-computer interaction interfaces are set according to different test locations.

[0103] like Figure 3 As shown, the human-computer interaction interface includes 5 streams of the large square billet continuous casting machine. The functions of each stream interface are the same, mainly including a test permission button, a start / stop button, a mode selection box, and monitoring diagrams of 10 straightening machines (including cylinder pressure, actual roll gap, lifting button, mode button, roll position status, etc.).

[0104] When the shutdown maintenance mode, starting the hydraulic pump, and the machine-side confirmation permission buttons are all met, the "Allow Operation" button on the left side of the interface turns green, otherwise the button displays red "Operation Prohibited".

[0105] like Figure 4 As shown, three test modes are set for each flow according to the on-site hydraulic pressure category, namely light pressure mode, ingot pressure mode, and hot billet pressure mode. The check box design is convenient for flexible use. When using, at least one mode must be checked, and multiple modes can also be selected. After checking, the font turns green. If the test is started, the system will perform sequential diagnosis according to the selected mode.

[0106] like Figure 4 As shown, there is a "one-button start and stop" button in the upper right corner of the interface, through which all flows can be tested simultaneously; on the right side of the interface, each flow is designed with a start and stop button to facilitate the test of a single flow. The start button turns green to indicate that it has been started, and the stop button turns orange to indicate that it has been stopped.

[0107] After the test is started, the first straightening machine in this flow will be tested one by one. Each straightening machine will perform lifting and lowering actions according to the selected working mode. Each working mode will perform a rising action and a falling action. Each action will be performed for 5 seconds. If a certain displacement variable (collected by the displacement sensor) is not reached within 5 seconds, the process is judged to be abnormal, otherwise it is normal. If it is abnormal, it will be automatically marked (that is, what action corresponds to what fault). When the diagnosis of the previous machine is completed, the next test diagnosis will be started, and the above judgment process will be repeated until the last machine is completed or the stop button is pressed. If all three modes are selected, the test of 10 straightening machines can be completed in a maximum of 5 minutes.

[0108] like Figure 5 As shown, after the test of each straightening machine is completed, the fault diagnosis system will automatically determine whether the operation of the straightening machine is normal, and display it on the right side of the corresponding screen, with the words normal or abnormal. The specific fault information is displayed using cursor prompt information, that is, when the cursor is moved below the word abnormal, specific fault information will appear.

[0109] like Figure 6 As shown in the figure, each straightening machine is equipped with an independent straightening machine monitoring diagram. Each flow has 10 identical straightening machine monitoring diagrams, which are used for the inching test and status display of a single straightening machine. Each straightening machine monitoring diagram includes 5 buttons: "up", "down", "hot billet pressure", "ingot pressure", and "light pressure down", which are mainly used for further confirmation of faults and single-unit testing after fault processing. The mode button of each straightening machine also has 3 modes that can be switched through the three buttons below. Displaying "hot" means it is in the hot billet pressure mode, displaying "ingot pressure" means it is in the ingot pressure mode, and displaying "light" means it is in the "light pressure down" mode. In different modes, you can click the "up" or "down" button to perform an action test, and judge whether the action is normal by whether the roll gap value changes and the speed of change.

[0110] like Figure 7 As shown, after the test is completed, click the stop button of each flow or the one-key start and stop button to change it to the stop state, and then click the "Operation Allowed" button to change it to the "Operation Prohibited" state. The test is over and you can exit the interface.

[0111] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A method for diagnosing faults of a straightening machine of a large square billet continuous casting machine, wherein the large square billet continuous casting machine has multiple streams, each stream has multiple straightening machines, and is characterized in that: The fault diagnosis method includes: single unit test and single flow test; The single-stream test includes: performing the single-unit test on all the tension and leveling machines in one stream one by one; The single unit test comprises the following steps: S1: Determine whether the selected working mode includes the light pressing mode, if yes, proceed to S1.1, otherwise proceed to S2; S1.1: Control the straightening machine to perform forward movement in the light pressure mode, stop after the first set time t1 seconds, and judge whether the displacement change of the straightening roller reaches the set displacement requirement. If yes, proceed to S1.2, otherwise it is judged as a light pressure fault and the diagnosis ends; S1.2: Control the tensioning and straightening machine to perform reverse action in the light pressure mode, stop after the first set time t1 seconds, and judge whether the displacement change of the tensioning and straightening roller reaches the set displacement requirement. If yes, proceed to S2, otherwise it is judged as a light pressure fault and the diagnosis ends; S2: Determine whether the currently selected working mode includes the ingot pressure mode, if yes, proceed to S2.1, otherwise proceed to S3; S2.1: Control the straightening machine to perform forward action in the ingot pressure mode, stop after the second set time t2 seconds, and judge whether the displacement change of the straightening roller reaches the set displacement requirement. If yes, proceed to S2.2, otherwise it is determined that the ingot pressure is faulty and the diagnosis ends; S2.2: Control the straightening machine to reverse the ingot pressure mode, stop after the second set time t2 seconds, and judge whether the displacement change of the straightening roller reaches the set displacement requirement. If yes, proceed to S3, otherwise it is judged that the ingot pressure is faulty and the diagnosis ends; S3: Determine whether the currently selected working mode includes the hot billet pressing mode. If yes, proceed to S3.

1. Otherwise, determine that the straightening machine is normal and the diagnosis ends. S3.1: Control the straightening machine to enter the hot billet pressing mode and move forward. Stop after the third set time t3 seconds. Determine whether the displacement change of the straightening roller reaches the set displacement requirement. If yes, proceed to S3.

2. Otherwise, determine that the hot billet pressing mode is faulty and the diagnosis ends. S3.2: Control the straightening machine to enter the hot billet pressing mode and move in reverse, stop after the third set time t3 seconds, and judge whether the displacement change of the straightening roller reaches the set displacement requirement. If so, the straightening machine is judged to be normal, otherwise, the hot billet pressing is judged to be faulty and the diagnosis ends.

2. A method for diagnosing a fault of a billet continuous casting machine straightening machine according to claim 1, characterized in that: The fault diagnosis method also includes a one-button test, The one-button test includes the following steps: The single test is performed on all the straightening machines in each flow, one by one, and multiple flows are performed simultaneously.

3. A large square billet continuous casting machine straightening machine fault diagnosis system, characterized in that: The fault diagnosis system comprises: Displacement sensor, used to measure the displacement information of the straightening machine; A controller, used to control the working mode of the straightening machine and receive the displacement information of the straightening machine measured by the displacement sensor, wherein the controller stores a fault diagnosis program, and the fault diagnosis program is used to execute the method for diagnosing the straightening machine of the billet continuous casting machine according to any one of claims 1 to 2 to perform fault diagnosis; The human-computer interaction system includes at least one human-computer interaction interface connected to the controller and used for inputting control instructions to the controller and displaying fault diagnosis information.

4. A large square billet continuous casting machine straightening machine fault diagnosis system according to claim 3, characterized in that: The controller is a PLC; The fault diagnosis program includes a main program, a first subprogram and a second subprogram; The main program is used for parameter setting, data collection, and calling the first subprogram and the second subprogram; The first subroutine is used for overall motion control of each tension and straightening machine, output of diagnostic results and calling of the second subroutine; The second subroutine is used for the lifting and lowering motion control and fault diagnosis of each tension and straightening machine.

5. A bloom continuous casting machine straightening machine fault diagnosis system according to claim 3, characterized in that: The human-computer interaction system includes a plurality of human-computer interaction interfaces, and the plurality of human-computer interaction interfaces are respectively arranged at different locations.

6. A bloom continuous casting machine straightening machine fault diagnosis system according to claim 4, characterized in that: The human-computer interaction interface includes a plurality of flow interfaces, each of which includes: a mode selection box, a start button, a stop button and a plurality of identical tension and straightening machine monitoring diagrams; The mode selection box is used to single-select or double-select the working mode of the current flow, including a light pressing selection box, a starter pressing selection box and a hot billet pressing selection box; The start button is used to send a single-stream test instruction to the controller; The stop button is used to send a stop test instruction to the controller; The plurality of tensioning and straightening machine monitoring diagrams correspond one to one with the plurality of tensioning and straightening machines, and are used to display the normal or fault status of each tensioning and straightening machine.

7. A bloom continuous casting machine straightening machine fault diagnosis system according to claim 6, characterized in that: The monitoring diagram of the tension and straightening machine also includes an ascending button, a descending button, a hot billet pressing button, a starter pressing button and a light pressing button; The hot billet pressing button, the starter ingot pressing button and the light press button are used to select the working mode of the single test; The rising button and the falling button are used to send a forward action instruction or a reverse action instruction to the controller.

8. A bloom continuous casting machine straightening machine fault diagnosis system according to claim 6, characterized in that: The human-computer interaction interface also includes a one-key start-stop button, which is used to send a one-key test instruction and a stop test instruction to the controller. The one-key test instruction is used to execute a single-unit test on all the tensioning and straightening machines in each flow, and multiple flows are carried out simultaneously.

9. A bloom continuous casting machine straightening machine fault diagnosis system according to claim 3, characterized in that: The controller communicates with the human-computer interaction system via Ethernet.

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