Longitudinal crack breakout detection and forecasting device for continuous casting sheet billet

Abstract

The invention relates to the technical field of continuous casting slab longitudinal crack breakout detection and forecasting, and provides a continuous casting slab longitudinal crack breakout detection and forecasting device which comprises a base and a transmission belt, and the top of the base is fixedly connected with a machine body. The driving shaft rotates to drive the twelve sets of driven shafts to rotate through the transmission belt, and the driving shaft and the twelve sets of driven shafts rotate to drive the conveying rollers to rotate to convey the continuous casting slabs on the conveying rollers. Meanwhile, a detection probe is driven by a connecting shaft, a rotating gear, a toothed bar, a hydraulic bin, a movable base and other assemblies to repeatedly move front and back ends to detect the continuous casting sheet billet in the conveying process, an alarm gives an alarm when the longitudinal crack steel leakage situation is detected, and the situation of detection dead angles can be prevented through simultaneous detection of the three sets of detection forecasting mechanisms; therefore, the detection precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of detection and prediction of longitudinal cracks and steel leakage in continuous casting slabs, and in particular to a device for detection and prediction of longitudinal cracks and steel leakage in continuous casting slabs. Background Art

[0002] Slab continuous casting is a continuous steelmaking technology with slab as the main product. Slabs with a width-to-thickness ratio greater than 3 are called slabs. Continuous casting and rolling slabs are mainly used to roll flat plates (thick plates, medium plates, thin plates, and strip coils). Usually, the slabs cast by continuous casting machines have a thickness of 150-250mm and a width of 1000-1800mm. Small slabs can be 600mm wide and 120mm thick. Slabs with a thickness of less than 100mm are called thin slabs.

[0003] The patent document with publication number CN105195689B discloses a continuous casting slab longitudinal crack leakage detection and prediction device and its detection method, including a high temperature resistant metal ceramic probe, a metal guide rod, a guide groove, a hydraulic cylinder, a hydraulic lock, a one-way throttle valve, a reversing valve, a hydraulic pump, a fuel tank and a PLC control system. The high temperature resistant metal ceramic probe is installed on the metal guide rod, the metal guide rod is connected to the hydraulic cylinder, the hydraulic cylinder, the hydraulic lock, the ball valve, the one-way throttle valve, the reversing valve, the hydraulic pump, and the fuel tank are connected in sequence with a metal hydraulic hose. The hydraulic cylinder drives the metal guide rod under the action of the hydraulic pump, and the metal guide rod moves back and forth to install Installed at both ends of the guide groove, the high-temperature resistant metal ceramic probe is connected to the PLC control system through a signal line. In the above application document, the high-temperature resistant metal ceramic probe is moved back and forth above the continuous casting slab to detect the actual temperature of the continuous casting slab, and then the temperature is transmitted to the PLC control system. When the high-temperature resistant metal ceramic probe detects a sudden change in temperature above 50°C, the PLC control system automatically issues an alarm. At this time, the PLC control system automatically switches to the accident control mode or the manual operation mode to reduce the pulling speed of the continuous casting slab to reduce the spread of longitudinal cracks. The detection of longitudinal cracks in the continuous casting slab in the above application document is not comprehensive enough, and blind spots in detection are prone to occur. Summary of the invention

[0004] The present invention provides a device for detecting and predicting longitudinal cracks and steel leakage in continuous casting slabs, which solves the problems raised in the above documents.

[0005] The technical solution of the present invention is as follows: a device for detecting and predicting longitudinal cracks and steel leakage in continuous casting slabs, comprising a base and a transmission belt, the top of the base is fixedly connected to a body, the inner side of the body is rotatably connected with a driving shaft and twelve groups of driven shafts, the middle ends of the driving shaft and the twelve groups of driven shafts are fixedly connected with conveying rollers, the driving shaft and the twelve groups of driven shafts are connected by transmission belts, a motor is arranged at the front end of the body, the output shaft of the motor is fixedly connected to the front end of the driving shaft, three groups of detection and prediction mechanisms and two groups of limit mechanisms are arranged on the top of the base; the detection and prediction mechanism comprises a connecting shaft and a bracket, one end of the connecting shaft is fixedly connected to one of the groups of driven shafts, and the other end of the connecting shaft is fixedly connected There is a rotating gear, and a sliding rod is fixedly connected to the inner side of the bracket, and a moving seat is slidably connected to the surface of the sliding rod, and a return spring is sleeved on the surface of the sliding rod. An electric push rod is arranged at the bottom of the moving seat, and a detection body is fixedly connected to the output end of the electric push rod, an alarm is arranged on the top of the detection body, and a detection probe is arranged at the bottom of the detection body. A hydraulic warehouse is penetrated and fixedly connected to the side of the bracket, and a piston rod A is slidably connected to the internal piston at one end of the hydraulic warehouse, and a gear rod is fixedly connected to the end of the piston rod A away from the hydraulic warehouse, and a piston rod B is slidably connected to the internal piston at the other end of the hydraulic warehouse, and the end of the piston rod B away from the hydraulic warehouse is fixedly connected to the moving seat, and a deceleration mechanism is arranged on the top of the moving seat.

[0006] The diameters of the driving shaft and the twelve groups of driven shafts are equal, and the diameters of the driving shaft and the twelve groups of driven shafts are equal, so that when the driving shaft rotates through the transmission belt to drive the twelve groups of driven shafts to rotate, the speeds of the driving shaft and the twelve groups of driven shafts are equal.

[0007] The rotating gear is an incomplete gear, and the teeth on the rotating gear are matched with the teeth on the gear rod. When the rotating gear rotates and its upper teeth are engaged with the teeth on the gear rod, the gear rod will be driven to move downward, and when the rotating gear rotates to the toothless part, it will be out of engagement with the gear rod.

[0008] Both ends of the return spring are in contact with the side surface of the moving seat and the inner side of the bracket in an initial state, and the return spring is compressed when the moving seat moves toward the rear end.

[0009] The deceleration mechanism includes a deceleration block, a connecting frame and a limiting rod. The deceleration block is fixedly connected to the top of the inner side of the bracket. The bottoms of the connecting frame and the limiting rod are fixedly connected to the top of the moving seat. A rotating rod passes through the inner side of the connecting frame and is rotatably connected. Torsion springs are provided at both ends of the rotating rod. A contact block is fixedly connected to the middle end of the rotating rod.

[0010] The deceleration block is semi-cylindrical as a whole, is made of rubber, and the number of the deceleration blocks is set to eight groups. When the rubber deceleration block is squeezed with the contact block, a large resistance will be generated.

[0011] The end of the contact block away from the rotating rod is arc-shaped, and the end of the limiting rod away from the moving seat is close to the side of the contact block. When the contact block moves with the moving seat, its arc-shaped end will contact the deceleration block, and the limiting rod prevents the contact block from deflecting to the rear end.

[0012] The limiting mechanism includes two groups of connecting plates, the bottoms of the two groups of connecting plates are fixedly connected to the top of the machine body, the adjacent sides of the two groups of connecting plates are penetrated by and fixedly connected with a slide cylinder, a compression spring is arranged inside the slide cylinder, a slider is slidably connected inside the slide cylinder through the compression spring, one end of the slider away from the compression spring is fixedly connected to the limiting rod, one end of the limiting rod away from the slider is fixedly connected to the limiting block, and the surface of the limiting rod is rotatably connected to the limiting roller.

[0013] The limiting rod is L-shaped as a whole, the bottom of the limiting roller is higher than the top of the conveying roller, and the limiting roller will not affect the rotation of the conveying roller.

[0014] The limiting roller is cylindrical as a whole, and is made of alloy strip steel. When the conveying roller rotates to convey the continuous casting slab, the continuous casting slab will contact the limiting roller. The limiting roller made of alloy strip steel is resistant to high temperature and not easily damaged.

[0015] The working principle and beneficial effects of the present invention are: 1. The present invention is provided with a detection and prediction mechanism, so that when the motor is turned on to drive the driving shaft to rotate, the rotation of the driving shaft will drive the twelve groups of driven shafts to rotate through the transmission belt. The rotation of the driving shaft and the twelve groups of driven shafts will drive the conveying rollers to rotate to convey the continuous casting slabs thereon. At the same time, the detection probe will be driven by the connecting shaft, rotating gear, gear rod, hydraulic bin, moving seat and other components to repeatedly move the front and rear ends to detect the continuous casting slabs during the conveying process. When longitudinal cracks and steel leakage are detected, the alarm will sound an alarm. The simultaneous detection of three groups of detection and prediction mechanisms can prevent the occurrence of detection blind spots, thereby improving the detection accuracy.

[0016] 2. The present invention is provided with a deceleration mechanism, so that after the moving seat drives the detection probe to move to the rear end, the reset spring is compressed and rebounds to drive the moving seat and the detection probe to move to the front end and restore. The speed of the reset spring rebounding to drive the moving seat and the detection probe to move to the front end and restore will be slowed down through the cooperation of components such as the connecting frame, torsion spring, rotating rod, contact block, deceleration block, etc., to prevent the reset spring rebounding from driving the moving seat and the detection probe to move to the front end and restore at a speed too fast to affect the detection, and also to prevent the detection body and the detection probe from being damaged by vibration caused by excessive speed.

[0017] 3. In the present invention, two groups of limiting mechanisms are provided, so that the rotation of the active shaft and the twelve groups of driven shafts will drive the conveying rollers to rotate to convey the continuous casting slabs thereon. During the conveying process, the continuous casting slabs will contact the limiting rollers to drive the limiting rollers to rotate. At the same time, with the cooperation of the slide cylinder, compression spring, slider, limiting rod and other components, the continuous casting slabs during the conveying process will be limited to keep them in the middle position of the conveying rollers, thereby preventing the position deviation of the continuous casting slabs from affecting the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] Figure 1 It is a three-dimensional front view of the overall structure of the present invention; Figure 2 It is a three-dimensional back view of the overall structure of the present invention; Figure 3 It is a three-dimensional cross-sectional view of the overall structure of the present invention; Figure 4 It is a three-dimensional front view of the detection and prediction mechanism structure of the present invention; Figure 5 A three-dimensional bottom view of the detection and prediction mechanism structure of the present invention; Figure 6 It is a three-dimensional schematic diagram of the overall structure of the speed reduction mechanism of the present invention; Figure 7 It is a three-dimensional schematic diagram of the partial structure of the speed reduction mechanism of the present invention; Figure 8 It is a three-dimensional cross-sectional view of the limiting mechanism structure of the present invention.

[0020] In the figure: 1. base; 2. body; 3. driving shaft; 4. driven shaft; 5. conveyor roller; 6. transmission belt; 7. motor; 8. detection and prediction mechanism; 81. connecting shaft; 82. rotating gear; 83. bracket; 84. slide bar; 85. moving seat; 86. reset spring; 87. electric push rod; 88. detection body; 89. alarm; 810. detection probe; 811. hydraulic warehouse; 812. piston rod A; 813. gear rod; 814. piston rod B; 9. speed reduction mechanism; 91. speed reduction block; 92. connecting frame; 93. rotating rod; 94. torsion spring; 95. contact block; 96. limiting rod; 10. limiting mechanism; 101. connecting plate; 102. slide cylinder; 103. compression spring; 104. slide block; 105. limiting rod; 106. limiting block; 107. limiting roller. DETAILED DESCRIPTION

[0021] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1 like Figure 1 to Figure 7As shown, this embodiment proposes a continuous casting slab longitudinal crack leakage detection and prediction device, including a base 1 and a transmission belt 6, the top of the base 1 is fixedly connected to an organic body 2, the inner side of the organic body 2 is rotatably connected to a driving shaft 3 and twelve groups of driven shafts 4, the middle ends of the driving shaft 3 and the twelve groups of driven shafts 4 are fixedly connected to conveying rollers 5, the driving shaft 3 and the twelve groups of driven shafts 4 are transmission-connected through a transmission belt 6, the driving shaft 3 and the twelve groups of driven shafts 4 have the same diameter, and the driving shaft 3 and the twelve groups of driven shafts 4 have the same diameter, so that when the driving shaft 3 rotates and drives the twelve groups of driven shafts 4 to rotate through the transmission belt 6, the speed of the driving shaft 3 and the twelve groups of driven shafts 4 are equal, a motor 7 is arranged at the front end of the organic body 2, and the output shaft of the motor 7 is fixedly connected to the front end of the driving shaft 3, and three groups of detection and prediction mechanisms 8 and two groups of limit mechanisms 10 are arranged on the top of the base 1;The detection and prediction mechanism 8 includes a connecting shaft 81 and a bracket 83. One end of the connecting shaft 81 is fixedly connected to one group of driven shafts 4. The other end of the connecting shaft 81 is fixedly connected to a rotating gear 82. A sliding rod 84 is fixedly connected to the inner side of the bracket 83. A moving seat 85 is slidably connected to the surface of the sliding rod 84. A reset spring 86 is sleeved on the surface of the sliding rod 84. Both ends of the reset spring 86 are in contact with the side of the moving seat 85 and the inner side of the bracket 83 in the initial state. When the moving seat 85 moves to the rear end, the reset spring 86 is compressed. An electric push rod 87 is provided at the bottom of the moving seat 85. The output end is fixedly connected with a detection body 88, an alarm 89 is arranged on the top of the detection body 88, a detection probe 810 is arranged on the bottom of the detection body 88, a hydraulic chamber 811 is penetrated and fixedly connected to the side of the bracket 83, a piston rod A812 is slidably connected to the internal piston at one end of the hydraulic chamber 811, a gear rod 813 is fixedly connected to the end of the piston rod A812 away from the hydraulic chamber 811, the rotating gear 82 is an incomplete gear, and the teeth on the rotating gear 82 are matched with the teeth on the gear rod 813, and when the rotating gear 82 rotates and its upper teeth are meshed with the teeth on the gear rod 813, the gear rod 813 is driven downward. The gear 82 is disengaged from the gear rod 813 when it rotates to the toothless part. The other end of the hydraulic chamber 811 is internally piston-connected with a piston rod B814 in a sliding manner. The end of the piston rod B814 away from the hydraulic chamber 811 is fixedly connected to the moving seat 85. The top of the moving seat 85 is provided with a speed reduction mechanism 9, which includes a speed reduction block 91, a connecting frame 92 and a limiting rod 96. The speed reduction block 91 is fixedly connected to the top of the inner side of the bracket 83. The bottoms of the connecting frame 92 and the limiting rod 96 are fixedly connected to the top of the moving seat 85. The inner side of the connecting frame 92 is penetrated and rotatably connected with a rotating rod 93. Torsion springs 94 are provided at both ends of the rod 93, and a contact block 95 is fixedly connected to the middle end of the rotating rod 93. The deceleration block 91 is semi-cylindrical as a whole, and the material of the deceleration block 91 is rubber material, and the number of the deceleration blocks 91 is set to eight groups. When the rubber deceleration block 91 is squeezed with the contact block 95, a large resistance will be generated. The end of the contact block 95 away from the rotating rod 93 is arc-shaped, and the end of the limiting rod 96 away from the moving seat 85 is close to the side of the contact block 95. When the contact block 95 moves with the moving seat 85, its arc-shaped end will contact the deceleration block 91, and the limiting rod 96 prevents the contact block 95 from deflecting to the rear end. ;

[0023] In this embodiment, the base 1 is placed at the discharge of the continuous casting machine, and the motor 7 is turned on. The motor 7 drives the driving shaft 3 to rotate through its output shaft. The driving shaft 3 rotates through the transmission belt 6 to drive the twelve groups of driven shafts 4 to rotate synchronously, and the speed is equal. The rotation of the driving shaft 3 and the twelve groups of driven shafts 4 will drive the conveying rollers 5 thereon to rotate. The rotation of the array of conveying rollers 5 will convey the continuous casting slabs falling thereon, and the rotation of the driven shaft 4 will also drive the connecting shaft 81 to rotate. The rotation of the connecting shaft 81 will drive the rotating gear 82 to rotate. At the beginning, the rotating gear 82 rotates and the upper teeth thereof mesh with the upper teeth of the gear rod 813, which will drive the gear rod 813 to move downward. The gear rod 813 moves downward to drive the piston rod A 812 moves downward, and the downward movement of piston rod A812 will drive piston rod B814 to move to the rear end through the hydraulic pressure in hydraulic chamber 811, and the movement of piston rod B814 to the rear end will drive the moving seat 85 to move to the rear end along the slide rod 84, and the return spring 86 is compressed. When the rotating gear 82 rotates to the state where the toothless part is out of mesh with the gear rod 813, the return spring 86 rebounds and drives the moving seat 85 and piston rod B814 to move to the front end to restore. At this time, the hydraulic pressure in hydraulic chamber 811 drives piston rod A812 and gear rod 813 to move upward to restore, thus forming a cycle, and the moving seat 85 repeatedly moves back and forth to drive the detection body 88 to move back and forth repeatedly, and the detection body 88 repeatedly moves back and forth. The forward and backward movement drives the detection probe 810 to detect the continuous casting slab passing through the bottom. When longitudinal cracks and steel leakage are detected, the alarm 89 will sound an alarm. The electric push rod 87 can be turned on to adjust the distance between the detection probe 810 and the continuous casting slab. The simultaneous operation of the three sets of detection and prediction mechanisms 8 for maintenance can prevent the occurrence of detection blind spots, thereby improving the detection accuracy. When the moving seat 85 moves to the rear end, the contact block 95 follows the moving seat 85 to the rear end. One end of the arc will contact the deceleration block 91. At this time, the contact block 95 will deflect to the front end and will not be squeezed too much with the deceleration block 91 to generate a large resistance. Then the torsion spring 94 drives the restoration, which will not affect the movement. The movable seat 85 moves to the rear end, and in the process of the return spring 86 rebounding and driving the movable seat 85 to move back to the front end, the contact block 95 contacts the deceleration block 91 again. At this time, due to the existence of the limiting rod 96, the contact block 95 cannot deflect to the rear end and will be squeezed with the deceleration block 91 to produce a large resistance, thereby slowing down the speed at which the return spring 86 rebounds and drives the movable seat 85 and the detection probe 810 to move back to the front end and restore, preventing the return spring 86 rebounding and driving the movable seat 85 and the detection probe 810 to move back to the front end and restore at a speed that is too fast and affects the detection, and also preventing the detection body 88 and the detection probe 810 from being damaged by vibrations caused by excessive speed.

[0024] Example 2 like Figures 1 to 8As shown, based on the same concept as the above-mentioned embodiment 1, a second embodiment is also proposed, the limiting mechanism 10 includes two groups of connecting plates 101, the bottoms of the two groups of connecting plates 101 are fixedly connected to the top of the machine body 2, and the two groups of connecting plates 101 are both penetrated and fixedly connected with a slide cylinder 102 on one side close to each other, and a compression spring 103 is arranged inside the slide cylinder 102, and a slider 104 is slidably connected to the inside of the slide cylinder 102 through the compression spring 103, and the slider 104 is fixedly connected to the limiting rod 105 at one end away from the compression spring 103, and the limiting rod 105 is fixedly connected to the limiting rod 105. 05 One end away from the slider 104 is fixedly connected to the limiting block 106, and the surface of the limiting rod 105 is rotatably connected to the limiting roller 107. The limiting rod 105 is L-shaped as a whole, and the bottom of the limiting roller 107 is higher than the top of the conveying roller 5. The limiting roller 107 will not affect the rotation of the conveying roller 5. The limiting roller 107 is cylindrical as a whole, and the material of the limiting roller 107 is alloy strip steel. When the conveying roller 5 rotates to convey the continuous casting slab, the continuous casting slab will contact the limiting roller 107. The limiting roller 107 made of alloy strip steel is resistant to high temperature and not easy to be damaged.

[0025] In this embodiment, the rotation of the active shaft 3 and the twelve groups of driven shafts 4 will drive the conveying rollers 5 to rotate to convey the continuous casting slabs thereon. During the conveying process, the continuous casting slabs will contact the limiting rollers 107 to drive the limiting rollers 107 to rotate. The cooperation of the two groups of limiting rollers 107 and the two groups of compression springs 103 will limit the continuous casting slabs during the conveying process so that they remain in the middle position of the conveying rollers 5, thereby preventing the position of the continuous casting slabs from shifting and affecting the detection accuracy.

[0026] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for detecting and predicting longitudinal cracks and steel leakage in continuous casting slabs, characterized in that: The invention comprises a base (1) and a transmission belt (6), wherein the top of the base (1) is fixedly connected to a main body (2), the inner side of the main body (2) is rotatably connected to a driving shaft (3) and twelve groups of driven shafts (4), the middle ends of the driving shaft (3) and the twelve groups of driven shafts (4) are fixedly connected to conveying rollers (5), the driving shaft (3) and the twelve groups of driven shafts (4) are connected in transmission via a transmission belt (6), a motor (7) is arranged at the front end of the main body (2), the output shaft of the motor (7) is fixedly connected to the front end of the driving shaft (3), and three groups of detection and prediction mechanisms (8) and two groups of limit mechanisms (10) are arranged at the top of the base (1); The detection and prediction mechanism (8) comprises a connecting shaft (81) and a bracket (83), one end of the connecting shaft (81) is fixedly connected to one of the groups of driven shafts (4), the other end of the connecting shaft (81) is fixedly connected to a rotating gear (82), the inner side of the bracket (83) is fixedly connected to a sliding rod (84), the surface of the sliding rod (84) is slidably connected to a moving seat (85), the surface of the sliding rod (84) is sleeved with a return spring (86), the bottom of the moving seat (85) is provided with an electric push rod (87), the output end of the electric push rod (87) is fixedly connected to a detection body (88), and the top of the detection body (88) is provided with a An alarm (89), wherein a detection probe (810) is provided at the bottom of the detection body (88), a hydraulic chamber (811) is penetrated through and fixedly connected to the side of the bracket (83), a piston at one end of the hydraulic chamber (811) is slidably connected to a piston rod A (812), an end of the piston rod A (812) away from the hydraulic chamber (811) is fixedly connected to a gear rod (813), and an internal piston at the other end of the hydraulic chamber (811) is slidably connected to a piston rod B (814), an end of the piston rod B (814) away from the hydraulic chamber (811) is fixedly connected to a movable seat (85), and a speed reduction mechanism (9) is provided on the top of the movable seat (85).

2. A device for detecting and predicting longitudinal cracks and steel leakage in continuous casting slabs according to claim 1, characterized in that: The diameters of the driving shaft (3) and the twelve sets of driven shafts (4) are equal.

3. The device for detecting and predicting longitudinal cracks and steel leakage of continuous casting slabs according to claim 2, characterized in that: The rotating gear (82) is an incomplete gear, and the teeth on the rotating gear (82) are matched with the teeth on the gear rod (813).

4. A device for detecting and predicting longitudinal cracks and steel leakage in continuous casting slabs according to claim 3, characterized in that: In the initial state, both ends of the return spring (86) are in contact with the side surface of the movable seat (85) and the inner side of the bracket (83).

5. The device for detecting and predicting longitudinal cracks and steel leakage of continuous casting slabs according to claim 4, characterized in that: The deceleration mechanism (9) comprises a deceleration block (91), a connecting frame (92) and a limiting rod (96); the deceleration block (91) is fixedly connected to the top of the inner side of the bracket (83); the bottoms of the connecting frame (92) and the limiting rod (96) are fixedly connected to the top of the movable seat (85); a rotating rod (93) penetrates the inner side of the connecting frame (92) and is rotatably connected thereto; torsion springs (94) are provided at both ends of the rotating rod (93); and a contact block (95) is fixedly connected to the middle end of the rotating rod (93).

6. The device for detecting and predicting longitudinal cracks and steel leakage in continuous casting slabs according to claim 5, characterized in that: The deceleration blocks (91) are semi-cylindrical in shape as a whole, are made of rubber material, and the number of the deceleration blocks (91) is set to eight groups.

7. A device for detecting and predicting longitudinal cracks and steel leakage in continuous casting slabs according to claim 6, characterized in that: One end of the contact block (95) away from the rotating rod (93) is arc-shaped, and one end of the limiting rod (96) away from the movable seat (85) is close to the side surface of the contact block (95).

8. The device for detecting and predicting longitudinal cracks and steel leakage of continuous casting slabs according to claim 7, characterized in that: The limiting mechanism (10) comprises two groups of connecting plates (101), the bottoms of the two groups of connecting plates (101) are fixedly connected to the top of the machine body (2), the sides of the two groups of connecting plates (101) that are close to each other are penetrated by and fixedly connected with a slide cylinder (102), a compression spring (103) is arranged inside the slide cylinder (102), a slider (104) is slidably connected inside the slide cylinder (102) via the compression spring (103), one end of the slider (104) away from the compression spring (103) is fixedly connected to a limiting rod (105), one end of the limiting rod (105) away from the slider (104) is fixedly connected to a limiting block (106), and the surface of the limiting rod (105) is rotatably connected to a limiting roller (107).

9. A device for detecting and predicting longitudinal cracks and steel leakage in continuous casting slabs according to claim 8, characterized in that: The limiting rod (105) is L-shaped as a whole, and the bottom of the limiting roller (107) is higher than the top of the conveying roller (5).

10. A device for detecting and predicting longitudinal cracks and steel leakage in continuous casting slabs according to claim 9, characterized in that: The limiting roller (107) is cylindrical in shape as a whole, and is made of alloy strip steel.

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