Online marking device for hot-rolled steel billets

Abstract

The utility model belongs to the technical field of hot-rolled steel billets, particularly relates to an on-line marking device for hot-rolled steel billets, and aims to overcome the defects that in the prior art, oxide skin is left on the surfaces of the steel billets before marking, and laser marking is fuzzy, broken and the like. In order to solve the problem that equipment is damaged or positioning precision is reduced due to the fact that splashing high-temperature chippings and dust are prone to being impacted and attached to the surfaces of components in the cleaning process, the following scheme is provided that the device comprises a frame, supporting legs are fixedly installed at the four corners of the bottom of the frame, and an installation block is fixedly installed on the front side of the frame; the top of the frame is rotationally connected with a plurality of transmission wheels, the support is fixedly installed on the top of the frame, efficient scraping and thorough blowing of impurities are achieved, it is guaranteed that a mark base face is clean, a laser head and a camera can automatically ascend into a protection groove in the cleaning stage, erosion of high-temperature chippings and dust is avoided, and the service life of the laser head and the camera is prolonged. And the equipment failure rate and the maintenance cost are reduced.

Description

Technical Field

[0001] This application relates to the field of hot-rolled steel billet technology, and in particular to an online marking device for hot-rolled steel billets. Background Technology

[0002] Hot-rolled steel billets, as a key semi-finished product in the steel production process, rely on precise and efficient online marking operations for batch traceability, quality grading, and production tracking. The clarity and durability of the markings directly affect the efficiency of subsequent warehousing management, rolling processing, and quality accountability. Therefore, online marking devices must be adapted to the high-temperature characteristics of hot-rolled steel billets and the easy adhesion of oxide scale and slag on their surfaces to meet the requirements of continuous and high-precision operations.

[0003] Publication (Announcement) No.: CN216730076U discloses an online laser marking method and apparatus for hot-rolled steel billets, including a laser, a focusing system, a light guiding system, and a computer control system. The focusing system focuses the laser beam emitted by the laser into a light spot, and the light guiding system guides the focused light spot to the marking area on the hot-rolled steel billet. The computer control system controls the movement of the light guiding system according to the marking area information. The online marking apparatus for hot-rolled steel billets provided by this utility model can mark the billet information required for the production quality monitoring system on the surface of steel billets at temperatures above 700°C. Laser marking has both additive and subtractive functions, providing the best choice for different needs of steel enterprises. The marked information is permanent, clear, and aesthetically pleasing, with selectable fonts. The marking device can be easily integrated into the steel production line without affecting its operation.

[0004] Publication (Announcement) No.: CN215787491U discloses an online laser marking device for hot-rolled steel billets, relating to the fields of steel production and laser marking. The device includes a laser, a light guide mechanism, a focusing mechanism, a two-dimensional linear motion mechanism, and a control unit. The light guide mechanism guides the incident direction of the laser beam, the focusing mechanism focuses the laser beam into a spot and guides it to the surface of the steel billet for marking, and the control unit controls the movement of the two-dimensional linear motion mechanism based on the marking information. When installed on a production line, the device can mark the steel billet surface with marking information composed of multiple parallel lines or rotating spots using the focused spot. During the marking process, the device can be air-blown and water-cooled to meet the requirements of operation in high-temperature and harsh environments, ensuring the device's stability and reliability.

[0005] In existing technologies, oxide scale remains on the surface of the steel billet before marking, which directly leads to defects such as blurring and breakpoints in laser marking; and the high-temperature debris and dust that splash during the cleaning process are easy to impact and adhere to the surface of the parts, causing equipment damage or a decrease in positioning accuracy. Utility Model Content

[0006] The purpose of this invention is to solve the problems in the prior art where residual oxide scale on the surface of the steel billet before marking directly leads to defects such as blurring and breakpoints in laser marking; and the high-temperature debris and dust splashed during the cleaning process are prone to impact and adhere to the surface of the parts, causing equipment damage or reduced positioning accuracy. Therefore, an online marking device for hot-rolled steel billets is proposed.

[0007] The online marking device for hot-rolled steel billets provided in this application adopts the following technical solution:

[0008] An online marking device for hot-rolled steel billets includes:

[0009] The frame includes support legs fixedly installed at its four bottom corners, a mounting block fixedly installed on the front side of the frame, and multiple transmission wheels rotatably connected to the top of the frame. It also includes:

[0010] A bracket is fixedly installed on the top of the frame. A connecting block is fixedly installed on the bottom side of the bracket. A protective groove is opened inside the connecting block. A movable plate is slidably connected inside the protective groove. A laser head and a camera are fixedly installed at the bottom of the movable plate.

[0011] Two fixed blocks are symmetrically arranged on the left and right sides of the connecting block, respectively;

[0012] The cleaning mechanism, located inside two fixed blocks, is used to clean the top of the steel billet;

[0013] Both mounting slots are located at the bottom of the fixing block;

[0014] The protective mechanism, located inside the connecting block, is used to protect the laser head and camera during the operation of the cleaning mechanism, avoiding impact from high-temperature debris splashes, high-temperature radiation corrosion, and dust adhesion generated during the cleaning process.

[0015] The power mechanism is located inside the mounting slot on the left side and works in conjunction with the cleaning mechanism to automatically drive the protective mechanism to perform protective actions when the cleaning mechanism starts operation.

[0016] Furthermore, the cleaning mechanism includes two screw rods rotatably disposed inside two fixed blocks, the two screw rods being rotatably connected to the fixed blocks respectively, and each of the two screw rods being threadedly connected to a movable plate, the two movable plates being slidably connected to the fixed blocks, and a protective block being fixedly installed at the bottom end of each of the two movable plates.

[0017] Furthermore, hydraulic cylinders are fixedly installed inside the two protective blocks, and scrapers are installed at the output ends of the two hydraulic cylinders. A connecting plate is fixedly installed at the front end of the scraper, and an air nozzle is fixedly installed on the front side of the connecting plate.

[0018] Furthermore, a dual-axis motor is fixedly installed inside the front side of the connecting block. A rotating rod is fixedly installed on each of the two output shafts of the dual-axis motor. A bevel gear is fixedly installed on the two ends of the two rotating rods that are far apart from each other. A bevel gear is meshed with each of the two bevel gears and the two bevel gears are fixedly connected to the front ends of the two screws respectively.

[0019] Furthermore, the protective mechanism includes a fixing groove opened on the left side inside the connecting block, a screw rod two is rotatably connected inside the fixing groove, a Z-shaped moving plate is threadedly connected to the screw rod two, the right side of the Z-shaped moving plate is fixedly connected to the moving plate one, and the Z-shaped moving plate is slidably connected to the fixing groove.

[0020] Furthermore, the power mechanism includes a spring plate disposed inside the rear side of the mounting groove on the left side. The front end of the spring plate is slidably connected to the mounting groove, and the rear end is fixedly connected to the mounting groove. A rack is fixedly installed on the front left side of the spring plate. A gear is meshed with the rack. A rotating rod three is fixedly installed on the gear. The rotating rod three is rotatably connected to the mounting groove. A bevel gear five is fixedly installed on the outer surface of the rotating rod three.

[0021] Furthermore, the bevel gear five is meshed with a bevel gear six, and a rotating rod four is fixedly installed at the rear end of the bevel gear six. The rotating rod four is rotatably connected to the mounting groove, and a sprocket two is fixedly installed at the rear end of the rotating rod four.

[0022] Furthermore, a bevel gear three is fixedly installed on the outer surface of the screw two, and a bevel gear four is meshed with the bevel gear three. A rotating rod two is fixedly installed at the rear end of the bevel gear four. The rotating rod two is rotatably connected to the fixed groove. A sprocket one is fixedly installed at the rear end of the rotating rod two. The same chain one is meshed with the sprocket one and the sprocket two.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. This solution achieves mechanical linkage between cleaning and protection actions through a single power source, greatly simplifying the equipment structure and improving operational coordination; it synchronously drives the forward movement of the cleaning mechanism and the lifting and lowering of the protection mechanism, eliminating the need for additional independent power sources and complex control modules. This reduces the space occupied by the equipment and avoids the problem of misaligned action sequences caused by multiple power sources, significantly improving overall operational efficiency while reducing the equipment's manufacturing cost, failure rate, and subsequent maintenance difficulty.

[0025] 2. This solution uses an arc-shaped, passivated scraper blade made of high-temperature and wear-resistant alloy material, which is suitable for the curved surface of the billet top and can efficiently remove oxide scale and high-temperature waste residue without scratching the billet surface. Combined with an array of inclined air nozzles, a continuous high-pressure airflow curtain can be formed to blow away impurities and dust in time, ensuring that the marking base surface is clean and dry. This solves the defects of blurred marking and breakpoints caused by incomplete cleaning in existing technologies from the source, and improves the clarity and durability of laser marking.

[0026] 3. In this solution, the protective mechanism and the cleaning action are linked in real time. When the cleaning operation starts, the laser head and camera automatically rise with the moving plate into the closed protective groove inside the connecting block, which can completely avoid the impact of high-temperature debris splashes, dust adhesion and high-temperature radiation corrosion. After the cleaning is completed, it automatically descends to the working position. The automatic switching between "operation and protection" can be achieved without manual intervention, which not only protects the service life of precision components such as laser head and camera, but also ensures the accuracy and stability of visual positioning and marking, and reduces the probability of equipment failure and downtime.

[0027] This invention enables efficient scraping and thorough blowing of impurities, ensuring the cleanliness of the marking surface. It also allows the laser head and camera to automatically rise into the protective tank during the cleaning phase to avoid corrosion from high-temperature debris and dust. After cleaning, they automatically descend to the working position to ensure positioning and marking accuracy, reduce equipment failure rate and maintenance costs, and meet the needs of high-quality production in steel enterprises. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of an online marking device for hot-rolled steel billets proposed in this utility model;

[0029] Figure 2 This is a cross-sectional structural schematic diagram of an online marking device for hot-rolled steel billets proposed in this utility model;

[0030] Figure 3 This is a schematic diagram of the chain structure of an online marking device for hot-rolled steel billets proposed in this utility model;

[0031] Figure 4 This is a schematic diagram of the screw structure of an online marking device for hot-rolled steel billets proposed in this utility model;

[0032] Figure 5 This utility model proposes an online marking device for hot-rolled steel billets. Figure 1 Enlarged structural diagram of section A;

[0033] Figure 6 This utility model proposes an online marking device for hot-rolled steel billets. Figure 2 Enlarged structural diagram of section B;

[0034] Figure 7 This utility model proposes an online marking device for hot-rolled steel billets. Figure 6 Enlarged structural diagram of section C;

[0035] Figure 8 This utility model proposes an online marking device for hot-rolled steel billets. Figure 6 Enlarged structural diagram of section D in the middle;

[0036] Figure 9 This is a schematic diagram of the chain structure of an online marking device for hot-rolled steel billets proposed in this utility model.

[0037] Reference numerals: 1. Frame; 2. Transmission wheel; 3. Mounting block; 4. Support leg; 5. Bracket; 6. Connecting block; 7. Moving plate one; 8. Laser head; 9. Camera; 10. Dual-axis motor; 11. Rotating rod one; 12. Bevel gear one; 13. Bevel gear two; 14. Screw one; 15. Moving plate two; 16. Protective block; 17. Hydraulic cylinder; 18. Scraper; 19. Connecting plate; 20. Air nozzle; 21. Z-shaped moving plate; 22. Bevel gear three; 23. Bevel gear four; 24. Rotating rod two; 25. Sprocket one; 26. Spring plate; 27. Rack; 28. Gear; 29. ​​Rotating rod three; 30. Bevel gear five; 31. Bevel gear six; 32. Rotating rod four; 33. Sprocket two; 34. Chain one; 35. Fixing block; 36. Mounting slot; 37. Screw two; 38. Sprocket three; 39. Chain two. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0039] Example 1:

[0040] Reference Figures 1-9 A hot-rolled steel billet online marking device includes: a frame 1, with support legs 4 fixedly installed at the four bottom corners of the frame 1; a mounting block 3 fixedly installed on the front side of the frame 1; multiple transmission wheels 2 rotatably connected to the top of the frame 1; rotating columns fixedly installed at the front ends of the multiple transmission wheels 2; the multiple rotating columns extending through the front side of the frame 1 into the interior of the mounting block 3 and rotatably connected to the mounting block 3; sprockets 38 fixedly installed on the outer surface of the multiple rotating columns; a single chain 39 meshing with the multiple sprockets 38; a motor fixedly installed on the front interior of the mounting block 3; the output shaft of the motor fixedly connected to one of the rotating columns; and further includes:

[0041] The bracket 5 is fixedly installed on the top of the frame 1. A connecting block 6 is fixedly installed on the bottom side of the bracket 5. A protective groove is opened inside the connecting block 6. A movable plate 7 is slidably connected inside the protective groove. A laser head 8 and a camera 9 are fixedly installed at the bottom of the movable plate 7.

[0042] Two fixing blocks 35 are symmetrically arranged on the left and right sides of the connecting block 6, respectively;

[0043] The cleaning mechanism, located inside the two fixed blocks 35, is used to clean the top of the steel billet;

[0044] Both mounting slots 36 are located at the bottom of the fixing block 35;

[0045] The protective mechanism, located inside the connecting block 6, is used to protect the laser head 8 and camera 9 during the operation of the cleaning mechanism. It can avoid the impact of high-temperature debris splashing, high-temperature radiation erosion, and dust adhesion generated during the cleaning process. At the same time, it forms a closed protection for the laser head 8 and camera 9 when not in operation, avoiding interference from external debris.

[0046] The power mechanism is located inside the mounting slot 36 on the left side and works in conjunction with the cleaning mechanism. It automatically drives the protective mechanism to perform protective actions when the cleaning mechanism starts working, and automatically drives the protective mechanism to release the protection and reset after the cleaning mechanism completes its work. This achieves coordinated action between the protective action and the cleaning action without the need for an additional independent power source.

[0047] Reference Figure 2 , Figure 4 and Figure 5The cleaning mechanism includes two screws 14 rotatably mounted inside two fixed blocks 35. Each screw 14 is rotatably connected to a fixed block 35. A movable plate 15 is threaded onto each screw 14. Both movable plates 15 are slidably connected to the fixed blocks 35. A protective block 16 is fixedly installed at the bottom of each movable plate 15. A hydraulic cylinder 17 is fixedly installed inside each protective block 16. A scraper 18 is mounted on the output end of both hydraulic cylinders 17. A connecting rod is fixedly installed at the front end of the scraper 18. Connecting plate 19 has an air nozzle 20 fixedly installed on its front side. The scraper 18 is made of high-temperature and wear-resistant alloy material, with its bottom designed as an arc-shaped scraper blade adapted to the top surface of the steel billet. The scraper blade edge is blunted, allowing for efficient removal of oxide scale, high-temperature slag, and other impurities while avoiding scratching the steel billet surface. The air nozzle 20 adopts an array-type multi-nozzle structure, evenly distributed along the length of connecting plate 19. The nozzle outlet is inclined towards the scraping direction of scraper 18, forming a continuous high-pressure airflow curtain. The connecting block 6 has an air nozzle 20 fixedly installed on its front side. The device is equipped with a dual-axis motor 10. Two output shafts of the dual-axis motor 10 are fixedly mounted with rotating rods 11. Bevel gears 12 are fixedly mounted at the ends of the two rotating rods 11 that are far apart from each other. Each bevel gear 12 is meshed with a bevel gear 13. The two bevel gears 13 are respectively fixedly connected to the front ends of two screws 14. By starting the dual-axis motor 10, the two rotating rods 11, the two bevel gears 12, and the two bevel gears 13 can drive the two screws 14 to rotate synchronously and at the same speed, causing the two moving parts to rotate. Plate 15 moves smoothly forward along the guide structure of fixed block 35, and drives hydraulic cylinder 17, scraper 18, connecting plate 19 and air nozzle 20 to move forward synchronously. During operation, hydraulic cylinder 17 drives scraper 18 to descend to fit with the marking area of ​​billet. While scraper 18 moves forward to scrape away impurities, air nozzle 20 sprays high-pressure airflow to blow away the scraped impurities and debris from the marking area in time, and at the same time blow away the dust generated during the operation to ensure that the surface of the marking area is clean and dry, providing a precise working base for subsequent laser marking.

[0048] Reference Figure 6 and Figure 8The protective mechanism includes a fixed groove on the left side inside the connecting block 6. A screw 37 is rotatably connected inside the fixed groove. A Z-shaped moving plate 21 is threaded onto the screw 37. The right side of the Z-shaped moving plate 21 is fixedly connected to the moving plate 7. The Z-shaped moving plate 21 is slidably connected to the fixed groove. When the screw 37 rotates, it can drive the Z-shaped moving plate 21 to rise and fall vertically along the fixed groove through threaded transmission, thereby driving the moving plate 7 and the laser head 8 and camera 9 at its bottom to rise and fall synchronously. When the cleaning mechanism starts operation, the laser head 8 and camera 9 rise with the moving plate 7 into the protective groove inside the connecting block 6. The inner wall of the protective groove adheres to the moving plate 7 to form a closed protective space, which can effectively block the high-temperature debris, dust and high-temperature radiation splashed during the cleaning process from corroding and damaging the laser head 8 and camera 9. After cleaning is completed, the laser head 8 and camera 9 fall with the moving plate 7 to the working position to ensure marking accuracy and visual positioning accuracy.

[0049] Reference Figures 6-8 The power mechanism includes a spring plate 26 located inside the rear side of the mounting groove 36 on the left side. The front end of the spring plate 26 is slidably connected to the mounting groove 36, and the rear end is fixedly connected to the mounting groove 36. A rack 27 is fixedly installed on the front left side of the spring plate 26. The rack 27 is meshed with a gear 28. A rotating rod 29 is fixedly installed on the gear 28. The rotating rod 29 is rotatably connected to the mounting groove 36. A bevel gear 30 is fixedly installed on the outer surface of the rotating rod 29. The bevel gear 30 is meshed with a bevel gear 31. A rotating rod 32 is fixedly installed at the rear end of the bevel gear 31. The rotating rod 32 is rotatably connected to the mounting groove 36. A sprocket 33 is fixedly installed at the rear end of the rotating rod 32. A bevel gear 22 is fixedly installed on the outer surface of the screw 2 37. A bevel gear 22 is meshed with a bevel gear 23. A rotating rod 24 is fixedly installed at the rear end of the bevel gear 23. The rotating rod 24 is rotatably connected to the fixed groove. A sprocket 25 is fixedly installed at the rear end of the rotating rod 24. The sprocket 25 and the sprocket 23 are meshed with the same chain 34. When the dual-shaft motor 10 is started, the two screws 14 are driven to rotate synchronously through the bevel gear transmission. This drives the moving plate 15 to move the scraper 18 and the air nozzle 20 forward. The hydraulic cylinder 17 drives the scraper 18 to fit against the marked area of ​​the billet. At the same time, the protective block 16 moves away from the spring plate 26 and moves forward. Through the rack-gear, bevel gear, and sprocket-chain transmission, the screw 27 rotates, causing the laser head 8 and the camera 9 to rise into the protective groove to form a closed protection.

[0050] The implementation principle of the online marking device for hot-rolled steel billets in this application is as follows: Steel billet conveying: Start the motor, and drive all transmission wheels 2 to rotate synchronously through the transmission of sprocket 38 and chain 2 39, and then stop the machine to position the steel billet to be marked after conveying it to the working area.

[0051] Then, the dual-axis motor 10 is started. The dual-axis motor 10 drives the two screws 14 to rotate. When the two screws 14 drive the two moving plates 15 and the two protective blocks 16 to move forward, the two protective blocks 16 gradually move away from the spring plate 26, so that the front end of the spring plate 26 moves forward along the mounting groove 36. At the same time, the spring plate 26 drives the rack 27 to move forward synchronously. The rack 27 meshes with the gear 28, driving the gear 28 and the rotating rod 29 to rotate. The rotating rod 29 drives the rotating rod 32 to rotate through the meshing of the bevel gear 5 30 and the bevel gear 6 31. The rotating rod 32 drives the sprocket 2 33 to rotate. The sprocket 2 33 drives the sprocket 25 and the rotating rod 24 to rotate through the chain 1 34. The rotating rod 24 drives the screw 2 37 to rotate through the meshing of the bevel gear 4 23 and the bevel gear 3 22. Finally, the Z-shaped moving plate 21 drives the moving plate 7, the laser head 8, and the camera 9 to move upward and enter the protective state.

[0052] At the same time, by continuously moving forward, the scraper 18 can scrape away impurities such as oxide scale, and the array nozzle 20 sprays high-pressure airflow to blow away impurities and dust, ensuring that the marked area is clean and dry.

[0053] When the cleaning is completed and the protective block 16 is reset, the spring plate 26 is squeezed and drives the rack 27 to move backward. Through the above-mentioned reverse transmission link, the screw 37 is reversed, so that the laser head 8 and the camera 9 are lowered to the working position.

[0054] Cyclic operation: After marking is completed, scraper 18 rises and resets, the motor starts to transport the marked steel billet, and at the same time, the next steel billet to be marked is fed in, and the next cycle begins.

[0055] Example 2:

[0056] The difference between this embodiment and Embodiment 1 is that an anti-slip pad is provided at the bottom of the support leg 4 to further improve the stability of the equipment operation. The anti-slip pad is made of a highly wear-resistant and high-friction coefficient elastic material, which can increase the contact friction between the support leg and the ground and effectively suppress the vibration and displacement generated by the equipment during operation such as the rotation of the transmission wheel and the running of the motor. At the same time, the elastic material has a certain buffering effect, which can reduce the vibration transmission during the operation of the equipment. This not only avoids the impact of vibration on the accuracy of laser marking and camera positioning, but also reduces the wear of components caused by vibration, extends the overall service life of the equipment, and ensures the stability of continuous operation.

[0057] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An online marking device for hot-rolled steel billets, comprising a frame (1), characterized in that: Support legs (4) are fixedly installed at the four bottom corners of the frame (1), mounting blocks (3) are fixedly installed on the front side of the frame (1), and multiple transmission wheels (2) are rotatably connected to the top of the frame (1). The frame also includes: A bracket (5) is fixedly installed on the top of the frame (1). A connecting block (6) is fixedly installed on the bottom side of the bracket (5). A protective groove is opened inside the connecting block (6). A movable plate (7) is slidably connected inside the protective groove. A laser head (8) and a camera (9) are fixedly installed at the bottom of the movable plate (7). Two fixing blocks (35) are symmetrically arranged on the left and right sides of the connecting block (6); The cleaning mechanism, located inside two fixed blocks (35), is used to clean the top of the billet; Both mounting slots (36) are located at the bottom of the fixing block (35); The protective mechanism is located inside the connecting block (6) and is used to protect the laser head (8) and camera (9) during the operation of the cleaning mechanism. It can avoid the impact of high-temperature debris splashing, high-temperature radiation erosion and dust adhesion generated during the cleaning process. The power mechanism is located inside the mounting slot (36) on the left side and works in conjunction with the cleaning mechanism to automatically drive the protective mechanism to perform protective actions when the cleaning mechanism starts operation.

2. The online marking device for hot-rolled steel billets according to claim 1, characterized in that: The cleaning mechanism includes two screws (14) that are rotatably disposed inside two fixed blocks (35). The two screws (14) are rotatably connected to the fixed blocks (35). Each screw (14) is threadedly connected to a movable plate (15). The two movable plates (15) are slidably connected to the fixed blocks (35). The bottom ends of the two movable plates (15) are fixedly installed with protective blocks (16).

3. The online marking device for hot-rolled steel billets according to claim 2, characterized in that: Hydraulic cylinders (17) are fixedly installed inside the two protective blocks (16). Scrapers (18) are installed at the output ends of the two hydraulic cylinders (17). A connecting plate (19) is fixedly installed at the front end of the scraper (18). An air nozzle (20) is fixedly installed on the front side of the connecting plate (19).

4. The online marking device for hot-rolled steel billets according to claim 3, characterized in that: A dual-axis motor (10) is fixedly installed on the front side inside the connecting block (6). A rotating rod (11) is fixedly installed on each of the two output shafts of the dual-axis motor (10). A bevel gear (12) is fixedly installed on the two ends of the rotating rods (11) that are far apart from each other. A bevel gear (13) is meshed with each of the two bevel gears (12). The two bevel gears (13) are fixedly connected to the front ends of the two screws (14) respectively.

5. The online marking device for hot-rolled steel billets according to claim 4, characterized in that: The protective mechanism includes a fixing groove on the left side inside the connecting block (6), a screw rod (37) is rotatably connected inside the fixing groove, a Z-shaped moving plate (21) is threaded on the screw rod (37), the right side of the Z-shaped moving plate (21) is fixedly connected to the moving plate (7), and the Z-shaped moving plate (21) is slidably connected to the fixing groove.

6. The online marking device for hot-rolled steel billets according to claim 5, characterized in that: The power mechanism includes a spring plate (26) located inside the rear side of the mounting groove (36) on the left side. The front end of the spring plate (26) is slidably connected to the mounting groove (36), and the rear end is fixedly connected to the mounting groove (36). A rack (27) is fixedly installed on the left front end of the spring plate (26). A gear (28) is meshed with the rack (27). A rotating rod three (29) is fixedly installed on the gear (28). The rotating rod three (29) is rotatably connected to the mounting groove (36). A bevel gear five (30) is fixedly installed on the outer surface of the rotating rod three (29).

7. The online marking device for hot-rolled steel billets according to claim 6, characterized in that: The bevel gear five (30) is meshed with bevel gear six (31), and a rotating rod four (32) is fixedly installed at the rear end of the bevel gear six (31). The rotating rod four (32) is rotatably connected to the mounting groove (36), and a sprocket two (33) is fixedly installed at the rear end of the rotating rod four (32).

8. The online marking device for hot-rolled steel billets according to claim 7, characterized in that: A bevel gear three (22) is fixedly installed on the outer surface of the screw two (37). The bevel gear three (22) is meshed with a bevel gear four (23). A rotating rod two (24) is fixedly installed at the rear end of the bevel gear four (23). The rotating rod two (24) is rotatably connected to the fixed groove. A sprocket one (25) is fixedly installed at the rear end of the rotating rod two (24). The same chain one (34) is meshed with the sprocket one (25) and the sprocket two (33).

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