Safety control method and control device for continuous casting dummy bar

Abstract

The invention discloses a safety control method and device for a continuous casting dummy bar of a continuous casting machine, and the method comprises the following control steps: (1) sequentially dividing an arc-shaped section of the continuous casting machine, which is passed by a casting blank from an inlet of a crystallizer to a horizontal outlet, into a plurality of fan-shaped sections, and arranging an upper clamping roller and a lower clamping roller which correspond to each other on each fan-shaped section; (2) at least one fan-shaped section in the plurality of fan-shaped sections adopts a position adjusting mechanism with an adjustable roller distance between an upper clamping roller and a lower clamping roller; wherein the minimum adjusting value of the roller spacing is smaller than the thickness of the dummy bar, and the maximum adjusting value of the roller spacing is larger than the thickness of the dummy bar.

Description

Technical Field

[0001] The present invention belongs to the technical field of continuous steel casting, is applicable to a continuous casting machine using a dummy bar, and specifically relates to a continuous casting dummy bar safety control method and a control device. Background Art

[0002] Before pouring begins, a dummy bar must be inserted into the continuous casting machine to guide the strand into the machine. Once the dummy bar is in place, the first few segments near the mold press down to prevent it from sliding downward. After pouring begins, the first few segments gradually open. As pouring progresses, the segment clamping rollers open and close sequentially, ultimately pulling the dummy bar, carrying the strand, out of the casting machine.

[0003] The clamping rollers of most continuous casting machines are hydraulically pressed down to hold the dummy bar or billet. When the dummy bar is fed into the casting machine until the pouring begins, the dummy bar is at a high position in the casting machine. The height of arc-shaped and straight-arc casting machines is generally more than ten meters, and the weight of the dummy bar is generally about ten tons. Once an error in operation, hydraulic system, control system, or equipment failure occurs, the clamping rollers holding the dummy bar will be abnormally lifted or there will be insufficient pressure to press the dummy bar, causing the dummy bar to slide from the upper end of the casting machine until it passes through the casting machine and directly rushes into the winch aisle, causing damage to the equipment and personnel in the aisle, posing a huge safety hazard.

[0004] There are currently two related solutions for AVI.

[0005] Patent document CN102470428B, entitled "Method for securing a dummy bar in a continuous casting device and continuous casting device having a dummy bar," discloses a method for preventing the dummy bar from being secured. However, this method requires modifying the original equipment and adding a stopper to prevent the dummy bar from slipping. This process is complex and requires high investment, making it difficult to promote on all casting machines, especially on already built casting machines.

[0006] The patent document with publication number CN101579727B and invention name “Method for holding a dummy rod in a continuous casting device and continuous casting device having a dummy rod” discloses a method for preventing the dummy rod from slipping, which blocks the conveying path of the dummy rod by making a conical adjustment to the sector close to the dummy rod. This method places extremely high demands on the stability of the equipment control. Once the sector cannot be lifted or the lifting signal is abnormal during the control, a serious billet delay accident will occur. At the same time, this technology can only be used for hydraulic sector, and mechanical sector cannot achieve a conical opening. Moreover, the minimum opening of the sector must be smaller than the thickness of the dummy rod, otherwise the technology cannot be applied. At the same time, casting machines that cannot achieve dynamic roll gaps cannot be applied. The applicability of this technology is very narrow. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the above-mentioned deficiencies of the prior art and provide a continuous casting dummy bar safety control method that does not require large-scale equipment hardware modification and investment and is applicable to all continuous casting machines.

[0008] The technical problem to be solved can be implemented through the following technical solutions.

[0009] A method for safely controlling a continuous casting dummy bar of a continuous casting machine is characterized by comprising the following control steps:

[0010] (1) The arc section of the continuous casting machine from the crystallizer inlet to the horizontal outlet through which the cast billet passes is divided into a plurality of fan-shaped segments in sequence, and each fan-shaped segment is provided with a corresponding upper clamping roller and a lower clamping roller;

[0011] (2) At least one of the plurality of sector segments adopts a position adjustment mechanism in which the roller spacing between the upper and lower clamping rollers is adjustable; wherein the minimum adjustment value of the roller spacing is less than the thickness of the dummy rod, and the maximum adjustment value of the roller spacing is greater than the thickness of the dummy rod.

[0012] Furthermore, the position adjustment mechanism has at least two position identification devices for identifying or judging that the clamping roller is shifted to positions corresponding to the minimum adjustment value and the maximum adjustment value of the roller spacing.

[0013] Preferably, the position identification device is two position detectors, and the two position detectors are arranged on a positioning plate, and the upper clamping roller or the lower clamping roller corresponding to the sector is positioned on the positioning plate.

[0014] Furthermore, the position identification device controls the hydraulic cylinder by lifting the upper clamping roller, and the hydraulic cylinder can output the pressure of the rod chamber and / or the rodless chamber, and judge the lifting or pressing position of the upper clamping roller of the fan segment according to the pressure value.

[0015] Furthermore, each of the sector segments is provided with the position adjustment mechanism.

[0016] Furthermore, the method further includes transmitting position change information of the clamping rollers of the sector corresponding to the dummy bar head to the clamping roller position control system of the adjacent sector and controlling the roller spacing between the upper and lower clamping rollers of the front adjacent sector based on the transmitted information.

[0017] Preferably, the roller spacing between the upper and lower clamping rollers is adjustable in the sector segment, the roller shaft of the lower clamping roller is a fixed shaft, and the roller shaft of the upper clamping roller is a position-adjustable roller shaft.

[0018] Furthermore, a position adjustment mechanism is provided at the sector segment at the very end close to the horizontal outlet, with the roller spacing between the upper and lower clamping rollers being adjustable.

[0019] Preferably, a light transmission detector is installed at the outlet of the last sector of the continuous casting machine.

[0020] Another technical problem to be solved by the present invention is to provide a control device for implementing the aforementioned control method.

[0021] Wherein, when the roller spacing of the clamping rollers of the corresponding sector is at the minimum adjustment value, the pressing pressure of the clamping rollers is ≥12 MPa.

[0022] The control method and control device of the above technical solution provide a device and method for preventing the dummy bar from slipping and causing injury accidents by utilizing the lifting and lowering of the clamping rollers of the continuous casting machine. The beneficial effects are as follows:

[0023] 1. Used in continuous casting machines, it solves the safety problem caused by the dummy bar slipping;

[0024] 2. It can be applied to various continuous casting machines, and can be used with up-feed and down-feed dummy rods and mechanical hydraulic sectors. It does not require the casting machine to have dynamic soft reduction capability, and has good adaptability to working conditions.

[0025] 3. The improved device has a simple and reliable structure and requires a small one-time investment;

[0026] 4. The dummy bar can be operated from the time it is inserted into the casting machine to the start of pouring, and the casting machine outlet can be operated, which improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the rising position of the clamping roller and the mounting plate;

[0028] Figure 2 This is a schematic diagram of the lowered position of the clamping roller and the mounting plate;

[0029] Figure 3 This is a schematic diagram of the pressing position of the clamping roller 5-2 on the last sector;

[0030] Figure 4 This is a schematic diagram of the pressing position of the clamping roller 1-2 on the first sector;

[0031] Figure 5 Schematic diagram of the depressed position of the clamping roller 4-2 on the sector closest to the tail of the dummy bar during the dummy bar conveying process;

[0032] In the figure: 0, crystallizer and bending section;

[0033] 1. Sector segment; 1-1. Lower clamping roller; 1-2. Upper clamping roller;

[0034] 2. Sector segment; 2-1. Lower clamping roller; 2-2. Upper clamping roller;

[0035] 3. Sector segment; 3-1. Lower clamping roller; 3-2. Upper clamping roller;

[0036] 4. Sector segment; 4-1. Lower clamping roller; 4-2. Upper clamping roller;

[0037] 5. Sector segment; 5-1. Lower clamping roller; 5-2. Upper clamping roller;

[0038] 6. Dummy bar; 6-1. Dummy bar head;

[0039] 7. Light detector; 8. Segment lower frame; 9. Segment upper frame; 10. Mounting plate;

[0040] 11-1. Position detector; 11-2. Position detector;

[0041] 12-1, Clamping roller lifting cylinder; 12-2, Clamping roller lifting cylinder; DETAILED DESCRIPTION

[0042] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0043] The present invention provides a continuous casting dummy bar safety control method and control device, which is based on the principle that after the upper clamping roller of the fan-shaped segment is pressed down, the distance between the upper clamping roller and the lower clamping roller must be less than the thickness of the dummy bar, and is an improvement on the existing technology.

[0044] Reference Figures 1 to 5 , along the direction of the billet forward, there are several sectors in front of the crystallizer and the curved section 0. The figure shows sector 1, sector 2, sector 3, sector 4 at the arc end and sector 5 at the horizontal outlet end; wherein, the sector 1 is provided with a corresponding upper clamping roller 1-2 and a lower clamping roller 1-1, the sector 2 is provided with a corresponding upper clamping roller 2-2 and a lower clamping roller 2-1, the sector 3 is provided with a corresponding upper clamping roller 3-2 and a lower clamping roller 3-1, the sector 4 is provided with a corresponding upper clamping roller 4-2 and a lower clamping roller 4-1, and the sector 5 is provided with a corresponding upper clamping roller 5-2 and a lower clamping roller 5-1. Each clamping roller is used to clamp and convey the billet passing through forward by rolling the rollers; see Figure 1 and Figure 2The lower clamping roller of each sector is positioned on the corresponding sector lower frame 8, and the upper clamping roller is installed on the mounting plate 10. The mounting plate 10 can be moved up and down relative to the corresponding sector upper frame 9 under the drive of the clamping roller lifting cylinders 12-1 and 12-2. Among them, position detectors 11-1 and 11-2 are provided on the sector upper frame 9. The two position detectors are respectively used to detect the position changes on both sides of the mounting plate 10; accordingly, the mounting plate 10 is provided with at least two position identification components for the position detector 11-1 to identify the position change of the mounting plate, and at least two position identification components for the position detector 11-2 to identify the position change of the mounting plate. Figure 1 and Figure 2 The different positions of the mounting plate after it is raised and lowered are shown in the figure. The specific technical solution is as follows:

[0045] Option 1: Install two pairs of position sensors on the clamping roller mounting plates (the devices on which the rollers are mounted and which synchronously raise and lower them) in the last few segments (usually one or two) at the continuous casting machine's billet exit to detect and output the rising and falling positions of the clamping rollers. Alternatively, displacement sensors can be installed on the clamping roller control cylinders in the last one or two segments, but this approach requires a larger investment. The principle and effectiveness are the same as those of the previous method.

[0046] Option 2: Install two pairs of position sensors on the clamping roller mounting plates of the top several segments (usually 3-4) at the continuous casting machine's billet inlet to monitor the roller's ascending and descending positions. Alternatively, displacement sensors can be installed on the clamping roller control cylinders of these segments, but this approach requires a larger investment. The principle and effectiveness are the same as with the previous method of installing position sensors.

[0047] The number of position detectors required depends on the number of clamping roller cylinders. For a clamping roller with a single cylinder, only one pair of position detectors is required. Similarly, for both Option 1 and Option 2, the optimal solution is that if the hydraulic cylinder control circuit of the segmented clamping rollers needed to prevent the dummy bar from sliding out has a continuous casting machine with pressure detection and output for raising and lowering the clamping rollers, then no additional detectors are required. Instead, the corresponding pressure detection value is used as the output signal for the clamping roller to rise and lower into position.

[0048] As the clamping roller rises and falls, the position of the clamping roller mounting plate relative to the upper segment frame changes. Position sensors installed on the mounting plate and the segment frame detect and transmit signals indicating whether the clamping roller is in the rising or falling position.

[0049] The corresponding position recognition device can be controlled by a hydraulic cylinder that raises and lowers the upper clamping roller. The hydraulic cylinder can output pressure from the rod chamber and / or rodless chamber, and based on this pressure value, determine whether the upper clamping roller in the corresponding segment is raised or lowered. Specifically, the position of the upper clamping roller can be determined using a detector or a hydraulic cylinder with pressure output. When the upper clamping roller is lowered or raised, the pressure changes in the rod chamber and / or rodless chamber of the hydraulic cylinder determine whether the clamping roller is in the lowered or raised state, and the hydraulic cylinder drives the clamping roller up and down.

[0050] Solution 1: For the upward feeding of the dummy bar, before the dummy bar is fed into the casting machine, if there is still a slab in the casting machine, when the dummy bar is fed in from point A above the crystallizer, even if the dummy bar slips, it will be blocked by the slab in the casting machine and will not continue to slide out of the casting machine to cause personal injury; while when the dummy bar is being transported, if there is no slab in the casting machine, or there is a slab when the dummy bar is being transported and the slab is pulled out, the light detector 7 is turned on and a signal is given to the upper clamping roller 5-2 of the sector 5 to descend. When the upper clamping roller 5-2 descends to the lower limit position, the position detectors 11-1 and 11-2 give a signal, the blocking is completed, and the system allows the dummy bar to be inserted.

[0051] For the downward delivery of the dummy bar, the dummy bar enters the casting machine from point B and gradually moves upward. When the dummy bar completely passes through the sector segment 5, the upper clamping roller 5-2 of the sector segment 5 descends. When the upper clamping roller 5-2 descends to the lower limit position, the position detectors 11-1 and 11-2 give a signal, the blocking is completed, and the system allows the dummy bar to continue to be transported upward.

[0052] In the first scenario, the dummy bar 6 initially enters the casting machine. As described above, the upper clamping rollers 5-2 of the segments 5 are in the lowered position to block any possible sliding of the dummy bar 6. When pouring begins, the upper clamping rollers 5-2 of the segments 5 rise. When they reach their upper limit, position sensors 11-1 and 11-2 generate upper limit position signals, releasing the blockage and allowing pouring to continue. If position sensors 11-1 and 11-2 fail to generate upper limit position signals after pouring begins, the operator is alerted and has sufficient time to adjust the upper clamping roller position before the dummy bar 6 reaches the segments 5, preventing accidents caused by blocking the dummy bar.

[0053] Option 2: For the upward feeding of the dummy bar, when the dummy bar 6 is ready to be fed in from point A above the crystallizer, a descending signal is given to the upper clamping roller 1-2 of the sector 1. When the upper clamping roller 1-2 descends to the lower limit position, the position detectors 11-1 and 11-2 of the upper clamping roller 1-2 give a lower limit position signal, the blocking is completed, and the system allows the dummy bar 6 to be inserted. When the dummy bar head 6-1 approaches the upper clamping roller 1-2, the upper clamping roller 2-2 of the sector 2 descends to the lower limit position, and the position detectors 11-1 and 11-2 of the upper clamping roller 2-2 give a lower limit position signal, and the upper clamping roller 2-2 completes the blocking. At the same time, the upper clamping roller 1-2 of the sector 1 rises to the upper limit position, and the position detectors 11-1 and 11-2 of the upper clamping roller 1-2 give an upper limit position signal. The blocking of the upper clamping roller 1-2 is released, and the system allows the dummy bar 6 to continue to descend. When the dummy bar head 6-1 approaches the upper clamping roller 2-2 of the sector 2, The upper clamping roller 3-2 of the sector 3 descends to the lower limit position, and the position detectors 11-1 and 11-2 of the upper clamping roller 3-2 give a lower limit position signal, and the upper clamping roller 3-2 is blocked. At the same time, the upper clamping roller 2-2 of the sector 2 rises to the upper limit position, and the position detectors 11-1 and 11-2 of the upper clamping roller 2-2 give an upper limit position signal, and the blocking of the upper clamping roller 2-2 is released. The system allows the dummy bar 6 to continue to descend. This sequence is repeated until the dummy bar 6 is transported. At this time, the sector clamping roller closest to the bottom of the dummy bar head 6-1 is in a blocked state. Figure 5 In the illustration, the upper clamping roller 4-2 of the sector 4 is pressed down as a barrier after the delivery of the dummy bar is completed.

[0054] For the downward delivery of the dummy bar, the dummy bar 6 enters the casting machine from point B and gradually moves upward. When the dummy bar 6 completely passes through the sector segment 4, the upper clamping roller 4-2 of the sector segment 4 descends. When the upper clamping roller 4-2 descends to the lower limit position, the corresponding position detectors 11-1 and 11-2 give a signal, and the blocking is completed.

[0055] When pouring begins, the upper clamping roller 4-2 of the segment 4 rises. When the upper clamping roller 4-2 reaches its upper limit, the corresponding position detectors 11-1 and 11-2 generate upper limit position signals, clearing the obstruction and allowing pouring to continue. If the corresponding position detectors 11-1 and 11-2 do not generate upper limit position signals during pouring, the operator is prompted to temporarily halt pouring and promptly raise the upper clamping roller to prevent accidents caused by blocking the dummy bar.

[0056] The difference between Option 1 and Option 2 is that Option 1, because the blockage is located at the rear of the casting machine, once the blockage begins, it cannot be removed, giving ample time for repair. Option 2, because the blockage is located closest to the dummy bar, if the dummy bar slips, the kinetic energy of the downward movement is minimized, minimizing damage to the equipment.

[0057] The following are more specific examples.

[0058] Example 1:

[0059] In a continuous casting machine, the two lifting hydraulic cylinders of the clamping roller of the last sector have rising and falling hydraulic pressure outputs respectively. A light detector is installed at the outlet of the last sector of the casting machine.

[0060] After a pouring operation is completed, but the slab has not yet been completely pulled out of the casting machine, the dummy rod for the next pouring operation needs to be inserted. When the dummy rod is inserted into the waiting position, the slab is completely pulled out of the casting machine. When the tail of the slab is completely pulled out of the casting machine, the light detector changes from the light-blocking state to the light-transmitting state, giving a signal that there is no slab in the casting machine. The upper clamping roller of the last sector is pressed down until the pressure of the two pressing cylinders of the clamping roller is ≥12MPa, confirming that the clamping roller has been pressed down to the lower limit and the dummy rod anti-slipping block is completed. When pouring begins, (since a slab has already been formed in the crystallizer, the dummy rod will not slip), the upper clamping roller of the last sector is lifted up until the pressure of the two pressing cylinders of the clamping roller is ≥12MPa, confirming that the clamping roller has been raised to the upper limit and the dummy rod anti-slipping block is released.

[0061] Example 2:

[0062] In a certain continuous casting machine, a pair of position detectors for the rising and falling limits of the clamping rollers are set on the clamping roller mounting plates of the 1-4# sectors.

[0063] Before the dummy bar is inserted into the casting machine from point A above the crystallizer, the upper clamping roller 1-2 of the sector 1 is pressed down. When the upper clamping roller 1-2 drops to the lower limit position, the position detectors 11-1 and 11-2 of the upper clamping roller 1-2 give a lower limit position signal, the blocking is completed, and the system allows the dummy bar to be inserted. When the dummy bar head 6-1 approaches the upper clamping roller 1-2, the upper clamping roller 2-2 of segment 2 drops to the lower limit position, and the position detectors 11-1 and 11-2 of the upper clamping roller 2-2 give a lower limit position signal. The upper clamping roller 2-2 is blocked. At the same time, the upper clamping roller 1-2 of segment 1 rises to the upper limit position. The position detectors 11-1 and 11-2 of the upper clamping roller 1-2 give an upper limit position signal. The blocking of the upper clamping roller 1-2 is released, and the system allows the dummy bar to continue to descend. When the dummy bar head 6-1 approaches the upper clamping roller 2-2 of segment 2, the upper clamping roller 3-2 of segment 3 drops to the lower limit position. The position detectors 11-1 and 11-2 of the upper clamping roller 3-2 give a lower limit position signal. The upper clamping roller 3-2 is blocked. The blocking of the upper clamping roller 2-2 of segment 2 is completed, and the upper clamping roller 2-2 of segment 2 rises to the upper limit position. The position sensors 11-1 and 11-2 of the upper clamping roller 2-2 provide upper limit position signals, and the blocking of the upper clamping roller 2-2 is released, allowing the dummy bar to continue descending. When the dummy bar head 6-1 approaches the upper clamping roller 3-2 of segment 3, the upper clamping roller 4-2 of segment 4 descends to the lower limit position. The position sensors 11-1 and 11-2 of the upper clamping roller 4-2 provide lower limit position signals, and the blocking of the upper clamping roller 4-2 is completed. At the same time, the upper clamping roller 3-2 rises to the upper limit position. The position sensors 11-1 and 11-2 of the upper clamping roller 3-2 provide upper limit position signals, and the blocking of the upper clamping roller 3-2 is released, and the dummy bar conveying ends and stops. At this time, the upper clamping roller 4-2 of segment 4 is in a blocked state.

[0064] When casting starts and casting is initiated, the upper clamping roller 4-2 of the sector segment 4 rises to the upper limit position, and the position detectors 11-1 and 11-2 of the upper clamping roller 4-2 give an upper limit position arrival signal, and the blocking of the upper clamping roller 4-2 is released.

[0065] Example 3:

[0066] During the insertion, retention, and initial start-up of a 4CC dummy bar at a certain steel company, the dummy bar's drive rollers were sometimes pressed down due to hydraulic issues. The dummy bar would then slide freely, reaching a height of over 13 meters. This could cause injury or damage to personnel and property. Historically, there have been several instances of dummy bar slippage, fortunately without nearby personnel causing any casualties. However, this posed a significant safety hazard.

[0067] By designing the 4CC program and utilizing the last No. 18 sector at the exit, its driving roller is pressed down and lifted up at a reasonable time to prevent the dummy rod from sliding down and injuring people or objects.

[0068] If the dummy bar slides down, the No. 18 sector can effectively block the dummy bar. Although it will damage it, since the No. 18 sector is the easiest to replace, the damage can be reduced to a minimum. In an emergency, the roll gap and drive roller of this section can be raised to the maximum position. As long as the broken roller is higher than the casting roll gap, production can continue.

[0069] Before the dummy bar is inserted, the driving roller of the No. 18 segment is automatically pressed down. After starting and reaching a certain casting length, the driving roller of the No. 18 segment is automatically raised. The process includes pouring, circulation, RCDB circulation and empty simulation circulation (which can be used to verify the debugging function). The details are as follows:

[0070] 1. Pressing conditions of driving roller of No. 18 sector

[0071] When the dummy bar is inserted or saved, and the photoelectric tubes (i.e., light detectors) are all through, when the above conditions are met, the driving roller of the No. 18 sector is triggered to press down. If it fails to press down, the central control will set an alarm to ensure that it is actually pressed down.

[0072] 2. Conditions for lifting the driving roller of the No. 18 sector

[0073] The pouring length is greater than the set length (for example, 4 meters), or the set part of the dummy bar reaches the set sector. When the above conditions are met, the driving roller of sector 18 is triggered to lift.

[0074] The present invention has a simple and efficient structure and can be applied to various types of casting machines. It has high applicability and safety and has a very broad application prospect. When the technology was tested on relevant continuous casting machines, it was recognized by relevant safety experts.

Claims

1. A method for safely controlling a continuous casting dummy bar of a continuous casting machine, characterized in that: The control steps include the following: (1) The arc section of the continuous casting machine from the crystallizer inlet to the horizontal outlet through which the cast billet passes is divided into a plurality of fan-shaped segments in sequence, and each fan-shaped segment is provided with a corresponding upper clamping roller and a lower clamping roller; (2) At least one of the plurality of sector segments adopts a position adjustment mechanism in which the roller spacing between the upper and lower clamping rollers is adjustable; wherein the minimum adjustment value of the roller spacing is less than the thickness of the dummy rod, and the maximum adjustment value of the roller spacing is greater than the thickness of the dummy rod.

2. The method for controlling the continuous casting dummy bar safety of a continuous casting machine according to claim 1, characterized in that: The position adjustment mechanism has at least two position identification devices for identifying or judging that the clamping roller is shifted to positions corresponding to the minimum adjustment value and the maximum adjustment value of the roller spacing.

3. The method for controlling the continuous casting dummy bar safety of a continuous casting machine according to claim 2, characterized in that: The position identification device is two position detectors, which are arranged on a positioning plate, and the upper clamping roller or the lower clamping roller corresponding to the sector is positioned on the positioning plate.

4. The method for controlling the continuous casting dummy bar safety of a continuous casting machine according to claim 2, wherein: The position identification device controls the hydraulic cylinder by lifting the upper clamping roller, and the hydraulic cylinder can output the pressure of the rod chamber and / or the rodless chamber, and judge the lifting or pressing position of the upper clamping roller of the fan segment according to the pressure value.

5. The method for controlling the continuous casting dummy bar safety of a continuous casting machine according to claim 1, wherein: Each of the sector segments is provided with the position adjustment mechanism.

6. The method for controlling the safety of a dummy bar of a continuous casting machine according to claim 4, wherein: The method also includes transmitting position change information of the clamping roller of the sector corresponding to the dummy bar head to the clamping roller position control system of the adjacent sector and controlling the roller spacing between the upper and lower clamping rollers of the front adjacent sector according to the transmitted information.

7. The method for controlling the continuous casting dummy bar safety of a continuous casting machine according to claim 1, 5 or 6, characterized in that: The roller spacing between the upper and lower clamping rollers is adjustable in the sector segment, the roller shaft of the lower clamping roller is a fixed shaft, and the roller shaft of the upper clamping roller is a position-adjustable roller shaft.

8. The method for controlling the continuous casting dummy bar safety of a continuous casting machine according to claim 1, wherein: A light detector is installed at the exit of the last sector of the continuous casting machine.

9. A control device for implementing the control method according to any one of claims 1 to 8.

10. The control device according to claim 9, characterized in that: When the roller spacing of the clamping rollers of the corresponding sector is at the minimum adjustment value, the pressing pressure of the clamping rollers is ≥12MPa.

Images