A hot billet turning and rejection device for a hot rolling line

Abstract

This utility model belongs to the technical field of hot rolling mill equipment, and relates to a hot billet turning and rejection device for hot rolling mill lines, integrating turning and rejection functions into one unit. The device includes a material feeding device, a steel pushing device, and a steel storage platform, with the storage platform serving as a supporting structure to support the other components. The material feeding device has an active feeding arm and at least one driven feeding arm, connected and fixed to the steel storage platform via a synchronous shaft. The tail end of the active feeding arm is hinged to a feeding hydraulic cylinder, and the front end is equipped with a turning hook to achieve rapid billet turning. The steel pushing device consists of multiple pushing cylinders with guide sleeves and cylinder pushers, integrally installed on the steel storage platform and away from the high-temperature zone. It uses four cylinders for pushing, resulting in fast dynamic response. This utility model overcomes the shortcomings of existing billet turning machine technology, combining turning and rejection in a single mechanism, reducing equipment and maintenance costs, shortening the turning process, significantly improving efficiency, and lowering overall costs, making it suitable for the high-efficiency production needs of hot rolling mill lines.

Description

Technical Field

[0001] This utility model belongs to the technical field of hot rolling mill equipment, and relates to a hot billet turning and rejection device for hot rolling mill lines. Background Technology

[0002] In hot rolling production lines, the handling of steel billets plays a crucial role in ensuring product quality and improving production efficiency. After exiting the self-heating furnace, steel billets must undergo a process of turning over and removing any scrap billets to meet the requirements of subsequent rolling processes.

[0003] Currently, uneven heating of steel billets is a common problem, mainly due to the constraints of the internal structure of the heating furnace. In particular, the walking beam heating method causes significant differences in heating between the upper and lower surfaces of the billet, creating a "yin-yang surface"—the upper part is hotter and brighter, while the lower part is colder and darker. This temperature unevenness leads to inconsistent elongation coefficients during rolling, resulting in uneven rolling force distribution. This, in turn, affects the operational stability of the rolling mill and product quality, causing issues such as bent heads and uneven edges. In severe cases, it can even lead to rolling interruption or equipment damage. To address the yin-yang surface problem, flipping the billet before rolling is essential. By flipping the billet, the original lower surface becomes the upper surface, thus equalizing the temperature distribution.

[0004] However, traditional billet turning machines have many limitations. They typically employ independent mechanical structures and drive systems, using hydraulic cylinders to control the claws to lift and turn the billets. However, this results in complex structures, large footprints, and increased production line length and layout complexity. Furthermore, they have long turning cycles, high maintenance costs, and low positioning accuracy, making it difficult to meet the precise turning requirements for billets of various sizes. In addition, hydraulic seals are prone to failure under high temperatures, further increasing maintenance frequency and costs.

[0005] In terms of scrap billet removal, traditional systems are often designed separately from the billet turning system, resulting in ineffective reuse of equipment resources. When scrap billets need to be removed, additional equipment and steps are required, increasing the complexity and cost of the production line. Furthermore, when these separate systems work together, information transmission delays and operational asynchrony issues may occur, affecting removal efficiency and accuracy. The current state of the billet pushing device, a key piece of equipment for pushing billets from the heating furnace outlet to the turning station, is also concerning. Traditional pushing devices mostly use hydraulic cylinders and are directly installed near the roller conveyor. However, in high-temperature environments, hydraulic seals are prone to failure, leading to inaccurate or non-existent pushing. Simultaneously, its positioning accuracy is limited by the mechanical structure and hydraulic system performance, making it difficult to meet the precise pushing requirements of billets of various specifications. This may lead to positional deviations of the billets at the turning station, affecting the turning effect and the stability of subsequent rolling processes. In addition, the maintenance costs of traditional pushing devices are high, and the harsh working conditions in high-temperature environments increase maintenance difficulty and costs.

[0006] In summary, the existing steel turning and scrap removal systems are separate, and the removal device can only handle abnormal billets, making it impossible to reuse equipment resources. There is an urgent need for equipment that can simultaneously turn over and remove hot billets in hot rolling lines. Utility Model Content

[0007] In view of this, the purpose of this utility model is to provide a hot billet turning and rejection device for hot rolling lines, to solve the existing problems, simplify the original complex turning device, and integrate the turning device into the original rejection device.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a hot billet turning and rejection device for a hot rolling line, comprising a material feeding device, a steel pushing device, and a steel storage platform. The steel storage platform is a supporting structure used to support the material feeding device and the steel pushing device. The material feeding device includes an active material feeding arm and at least one driven material feeding arm, which is connected to the active material feeding arm via a synchronous shaft. The synchronous shaft is fixed on the steel storage platform. The tail end of the active material feeding arm is hinged with a material feeding hydraulic cylinder, and the front end of each material feeding arm is provided with a steel turning hook. The steel pushing device includes multiple pushing cylinders and cylinder pushers. The cylinder pushers are provided with guide sleeves, and the steel pushing device is integrally mounted on the steel storage platform.

[0009] Optionally, the material feeding device includes one active feeding arm and three passive feeding arms. The active feeding arm and the three passive feeding arms are rigidly connected by a synchronous shaft to form a linkage structure. The steel flipping hook at the front end of the feeding arm is designed with a pointed shape. The contact point between the steel flipping hook and the steel billet is located on the side of the steel billet's center of gravity offset, realizing the lever-type rapid flipping of the steel billet.

[0010] Optionally, the height of the steel-turning hook is higher than the hinge point between the active material-feeding arm and the material-feeding hydraulic cylinder; the initial position of the steel-turning hook is lower than the working roller conveyor and is set between the working roller conveyors.

[0011] Optionally, the cylinder pusher is constrained by a guide sleeve to ensure linear steel pushing, and the guide sleeve is fixed on the steel storage platform.

[0012] Optionally, a roller cover plate is also included as a mechanical limiting structure, fixed to the side of the working roller conveyor; the roller cover plate cooperates with the cylinder pusher of the steel pushing device to precisely constrain the billet's stopping position.

[0013] Optionally, the steel storage platform is provided in 4 sets. Each set of steel storage platforms is provided with a synchronous shaft bearing seat installation position on the side. A steel plate is erected between the left and right sets of steel storage platforms for the installation of the pusher cylinder.

[0014] Optionally, two sets of pusher cylinders are installed on the steel plates erected between the left and right sets of steel storage platforms. They are connected to the pneumatic system through a set of pneumatic piping. The pneumatic system includes dual electrically controlled pneumatic slide valves and a pneumatic triplet, which separately control the two sets of pusher cylinders.

[0015] Optionally, the material feeding hydraulic cylinder is equipped with a displacement sensor for real-time monitoring of the cylinder's stroke; the hydraulic piping connects to an external hydraulic valve platform, which is equipped with a proportional directional valve, a hydraulically controlled check valve, a solenoid directional valve, and a hydraulic status connector.

[0016] The proportional directional valve is located at the inlet of the main hydraulic circuit and outputs oil pressure signals in real time through the hydraulic status connector; the pilot-operated check valve is located downstream of the proportional directional valve and achieves oil circuit cutoff and pressure maintenance through the solenoid directional valve; the solenoid directional valve has an independent control oil circuit, which is used to open or lock the pilot-operated check valve; the hydraulic status connector is located at the outlet monitoring point of the proportional directional valve.

[0017] Optionally, a thermal detector is installed at the outlet of the billet turning and walking position to provide a billet position signal.

[0018] Optionally, a laser profilometer is installed in the middle of the steel turning roller conveyor to detect surface defects.

[0019] The beneficial effects of this utility model are as follows: This utility model provides a hot billet turning and rejection device for a hot rolling mill line. By integrating a material feeding, pushing, and storage platform with an electromechanical-hydraulic collaborative control system, it achieves the dual functions of turning and rejecting billets, significantly reducing the equipment footprint and production line layout length, while also lowering the overall costs of procurement, installation, and maintenance. Its design, featuring a single hydraulic cylinder driving a synchronous shaft to link four sets of feeding arms, combined with a four-cylinder linked pusher and mechanical limiting by the roller cover plate, shortens the turning cycle to 7.5±0.8 seconds, achieving a position repeatability accuracy of ±1.5mm. It is also compatible with the rapid turning requirements of multiple billet specifications, eliminating the need for frequent parameter adjustments and greatly improving production line efficiency and flexibility. The feeding arms utilize high-strength structural steel and a pointed hook design. Combined with the proportional directional valve and hydraulically controlled check valve of the hydraulic system, it ensures structural strength and stable movement under high-temperature conditions, while dynamically adjusting the hydraulic flow to achieve adaptive switching between turning and rejection functions, reducing wear and tear on vulnerable parts and the failure rate. In addition, the electrical control system is equipped with a dual control mode of main control panel and machine-side control box, with real-time monitoring by thermal detector and laser profilometer, combined with interlocking logic control and emergency stop function to ensure operational safety and response speed. The design of the steel pushing device away from the high temperature zone and the application of high temperature resistant components further enhance the stability and reliability of the device under harsh working conditions, comprehensively improving the overall operating efficiency of the hot rolling production line.

[0020] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0022] Figure 1 This is a side view of the steel-turning and rejecting device of this utility model;

[0023] Figures 2-4 This is a schematic diagram of the steel-flipping function of this utility model;

[0024] Figures 5-8 This is a schematic diagram of the waste rejection function of this utility model;

[0025] Figure 9 This is a top view of the steel-turning and rejecting device of this utility model;

[0026] Figure 10 This is a pneumatic piping diagram for the steel-removing and turning process of this utility model;

[0027] Figure 11 This is a schematic diagram of the hydraulic principle for removing and turning steel according to this utility model.

[0028] Reference numerals: 1. Working roller conveyor; 2. Active feeding arm; 3. Steel storage platform; 4. Feeding hydraulic cylinder; 5. Displacement sensor; 6. Pushing cylinder; 7. Cylinder pusher; 8. Driven feeding arm; 9. Steel billet; 10. Thermal detector; 11. Laser profiler; 12. Dual-electric pneumatic slide valve; 13. Proportional directional valve; 14. Hydraulic check valve; 15. Electromagnetic directional valve; 16. Hydraulic status connector; 17. Roller conveyor cover plate; 18. Guide sleeve. Detailed Implementation

[0029] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0030] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0031] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0032] Please see Figures 1-6 This is a hot billet turning and rejection device for a hot rolling line. By integrating a material feeding, pushing, and storage platform with an electromechanical-hydraulic coordinated control system, it achieves the dual functions of turning and rejecting billets. The specific implementation method is described in detail below with reference to the accompanying drawings:

[0033] like Figure 1 , Figure 4 As shown, the device mainly consists of a working roller conveyor 1, a feeding device, a steel pushing device, a steel storage platform 3, and a roller conveyor cover plate 17. There are four sets of steel storage platforms 3, which serve as supporting structures and are evenly distributed on both sides of the working roller conveyor 1. Each set of steel storage platforms 3 has a synchronous shaft bearing seat installation position on its side. A steel plate is laid between the left and right sets of steel storage platforms 3 to install the feeding cylinder 6 (its position is lower than the height of the steel storage platform 3 where scrap steel is placed). The working roller conveyor 1 is horizontally arranged and used to transport steel billets 9. The roller conveyor cover plate 17 is fixed to the side of the working roller conveyor 1 and serves as a mechanical limiting structure, cooperating with the cylinder pusher head 7 of the steel pushing device to precisely constrain the position of the steel billet 9.

[0034] Design and working principle of the material feeding device: The material feeding device includes one active feeding arm 2 and three driven feeding arms 8. All feeding arms are rigidly connected by a synchronous shaft to form a linkage structure. The synchronous shaft is fixed on the steel storage platform 3. The tail end of the active feeding arm 2 is hinged to a feeding hydraulic cylinder 4. A displacement sensor 5 is installed inside the feeding hydraulic cylinder 4 to monitor the stroke of the hydraulic cylinder in real time. The hydraulic piping is connected to an external hydraulic valve platform. The hydraulic valve platform is equipped with a proportional directional valve 13, a hydraulic control check valve 14, a solenoid directional valve 15, and a hydraulic status connector 16. By dynamically adjusting the hydraulic flow, the smooth movement and precise positioning of the feeding arm are achieved.

[0035] Each feeding arm has a tipped hook at its front end. The tipped hook is designed with a pointed shape and its height is higher than the hinge point between the active feeding arm 2 and the feeding hydraulic cylinder 4. Its initial position is lower than the working roller conveyor 1 (located below the roller conveyor cover plate 17) and is positioned between the working roller conveyors 1 (without interfering with the working roller conveyor 1). Figure 2As shown, during the steel turning process, the material feeding hydraulic cylinder 4 pushes the active material feeding arm 2 to rotate around the synchronous shaft, which in turn drives the three driven material feeding arms 8 to move synchronously. The contact point between the steel turning hook and the steel billet 9 is located on the side of the center of gravity offset. The lever principle is used to realize the rapid turning of the steel billet 9, so that the original lower surface becomes the upper surface, in order to balance the temperature distribution.

[0036] Design and working principle of the steel pushing device: The steel pushing device includes multiple pushing cylinders 6 and cylinder pushers 7. Two sets of pushing cylinders 6 are installed on each of the steel plates erected between the left and right sets of steel storage platforms 3. They are connected to the pneumatic system through a set of pneumatic piping. The pneumatic system includes dual-electrically controlled pneumatic slide valves 12 and pneumatic triplet units, which separately control the two sets of pushing cylinders 6 to achieve synchronous action of the cylinders. The cylinder pusher 7 is equipped with a guide sleeve 18, which is fixed on the steel storage platform 3. The guide sleeve 18 constrains the movement trajectory of the cylinder pusher 7 to ensure straight pushing of steel and prevent the billet 9 from deviating during the pushing process.

[0037] like Figure 2 , Figure 3 As shown, when pushing the steel, the pushing cylinder 6 drives the cylinder pusher 7 to extend and push the steel billet 9 from the outlet of the heating furnace along the working roller table 1 to the steel turning station (the roller table cover plate 17 is constrained). The roller table cover plate 17 cooperates with the cylinder pusher 7 to precisely constrain the steel billet 9 to stop, ensuring that the side of the steel billet 9 contacts the roller table cover plate 17, providing accurate positional guarantee for subsequent steel turning operations.

[0038] The scrap removal function is implemented as follows: A thermal detector 10 is installed at the exit of the steel turning and walking position to provide the position signal of the steel billet 9; a laser profilometer 11 is installed in the middle of the steel turning roller conveyor to detect surface defects of the steel billet 9. When the laser profilometer 11 detects surface defects or dimensional deviations in the steel billet 9, the electrical control system controls the material handling device to operate based on the position signal of the steel billet 9 fed back by the thermal detector 10. Figure 3 As shown, during rejection, the material-dispensing hydraulic cylinder 4 pushes the material-dispensing arm to rotate, and the flipping hook head lifts the abnormal steel billet 9 from the working roller table 1 and flips it to the rejection position, realizing the rapid rejection of the waste billet. No additional equipment or steps are required, which simplifies the production line structure and reduces costs.

[0039] Electrical Control System and Safety Protection: The electrical control system features dual control modes: a main control console and a local control box. Operators can flexibly choose the control method according to production needs. The main control system is equipped with an interlocking logic for pushing steel → flipping / removing steel. During operation, the roller conveyor automatically stops to prevent equipment damage or personnel injury caused by billet movement. Simultaneously, the hydraulic system uses a proportional directional valve 13 to precisely control flow, and a hydraulically controlled check valve 14 to maintain pressure and lock, ensuring smooth and reliable operation. In case of abnormal system pressure, the electromagnetic directional valve 15 automatically switches, cutting off the oil circuit for emergency shutdown, further enhancing the safety and stability of the device.

[0040] The electrical control system controls the hydraulic and pneumatic systems through a PLC control system. The electrical components of the laser profilometer 11, thermal detector 10, hydraulic system, and pneumatic system are all connected to the electrical control system. This is a mature existing technology, so it will not be described in detail here.

[0041] Implementation Results: Through integrated design, this device significantly reduces the equipment footprint and production line length, lowering overall procurement, installation, and maintenance costs. Its single-cylinder-driven synchronous shaft linkage design for four sets of lever arms, combined with a four-cylinder-linked pusher and mechanical limiting via the roller cover 17, shortens the steel-turning cycle to 7.5±0.8 seconds, achieving a position repeatability accuracy of ±1.5mm. It also accommodates the rapid turning requirements of various billet specifications 9 without frequent parameter adjustments, greatly improving production line efficiency and flexibility. The lever arms utilize high-strength structural steel and a pointed hook design. Combined with the proportional directional valve 13 and hydraulically controlled check valve 14 in the hydraulic system, this ensures structural strength and stable movement under high-temperature conditions. Furthermore, dynamic adjustment of hydraulic flow enables adaptive switching between steel-turning and rejection functions, reducing wear and failure rates of vulnerable parts. In addition, the design of the steel-pushing device away from high-temperature zones and the application of high-temperature resistant components enhance the stability and reliability of the device under harsh operating conditions, comprehensively improving the overall operational efficiency of the hot rolling production line.

[0042] Example 1,

[0043] Before using the equipment, promptly remove any debris from the working roller conveyor; check for any interference in the movement trajectory of the hydraulic cylinders. Ensure that the dry lubrication is normal, and add dry lubrication at single points regularly; ensure that all bolt connections are secure; check the wear condition of easily worn parts such as the lever arm and bearing housing to ensure they meet the usage requirements; check that all valves in the pneumatic piping and hydraulic system are open normally, and confirm that all moving parts are functioning normally.

[0044] 1. Rejection function

[0045] After the billet 9 exits the heating furnace, it travels through the working roller conveyor 1 to the detection position of the hot billet detector 10. Once the hot billet detector 10 detects the billet 9, the working roller conveyor 1 stops rotating, ensuring that the billet 9 is accurately positioned within the hot billet turning and rejection frame's steel conveyor line. After the laser profilometer 11 detects that the billet 9's temperature, curvature, surface cracks, and dimensional deviations do not meet the rolling requirements, the proportional directional valve 13 on the hydraulic valve platform is energized. An input electrical signal (4–20mA) is used to steplessly adjust the valve core opening. The hydraulic status connector 16 provides feedback to change the input current value, thereby changing the hydraulic oil flow rate to ensure that the material-dispensing hydraulic cylinder 4 pushes the active material-dispensing arm 2 to extend its full stroke, lifting the billet 9 on the working roller conveyor 1. The billet 9 then slides from the dispensing arm surface onto the steel storage frame 3. After the entire rejection process is completed, the hydraulic cylinder retracts.

[0046] 2. Steel flipping function

[0047] After the billet 9 is accurately positioned within the hot billet turning and removal platform, the laser profilometer 11 detects that the billet 9's temperature, curvature, surface cracks, and dimensional deviations meet the rolling requirements. Then, the dual-electro-pneumatic slide valve 12 is energized, and four pusher cylinders 6 simultaneously extend the cylinder pusher head 7. The stroke is constrained by the guide sleeve 18, pushing the billet 9 to the edge of the roller cover plate 17, placing it in the turning position. The proportional directional valve 13 on the hydraulic valve platform is energized. Receiving a signal from the displacement sensor 5, the proportional directional valve 13 adjusts the flow rate according to the preset turning curve (stroke S1). The hydraulic cylinder 4 drives the lever hook to lift the billet to the critical tilt angle (α≥35°) and then it autonomously turns, rapidly rising and turning so that the center of gravity is facing downwards. After the billet turning is complete, it is retracted, and the working roller conveyor 1 restarts hot billet conveying. During the operation of the hydraulic system, the electromagnetic directional valve 15 controls the hydraulic check valve 14 for pressure holding and locking. The displacement sensor 5 built into the material feeding hydraulic cylinder provides real-time feedback on the cylinder's waiting position, rejection position, and steel-turning position. A proximity switch on the pneumatic device provides feedback on whether the pusher head 7 of the material feeding cylinder is in the steel-turning position.

[0048] After modification, the equipment features convenient operation, simple structure, and stable and reliable steel turning and rejection. It saves labor, reduces equipment costs, increases steel turning speed, and improves production efficiency. The position of the push cylinder device is determined by a proximity switch, and the steel turning and rejection are automated through a displacement sensor.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A hot billet turning and rejection device for a hot rolling line, characterized in that: It includes a material feeding device, a steel pushing device, and a steel storage platform. The steel storage platform is a supporting structure used to support the material feeding device and the steel pushing device. The material feeding device includes an active feeding arm and at least one driven feeding arm. The active feeding arm and the driven feeding arm are connected by a synchronous shaft, which is fixed on the steel storage platform. The tail end of the active feeding arm is hinged with a feeding hydraulic cylinder, and the front end of each feeding arm is provided with a steel flipping hook. The steel pushing device includes multiple pushing cylinders and cylinder pushers. The cylinder pushers are equipped with guide sleeves, and the entire steel pushing device is installed on the steel storage platform.

2. The hot billet turning and rejection device for a hot rolling line according to claim 1, characterized in that: The material feeding device includes one active feeding arm and three driven feeding arms. The active feeding arm and the three driven feeding arms are rigidly connected by a synchronous shaft to form a linkage structure. The steel flipping hook at the front end of the feeding arm is designed with a pointed shape. The contact point between the steel flipping hook and the steel billet is located on the side of the steel billet's center of gravity offset, realizing the lever-type rapid flipping of the steel billet.

3. The hot billet turning and rejection device for a hot rolling line according to claim 2, characterized in that: The height of the steel-turning hook is higher than the hinge point between the active material-feeding arm and the material-feeding hydraulic cylinder; the initial position of the steel-turning hook is lower than the working roller table and is set between the working roller tables.

4. The hot billet turning and rejection device for a hot rolling line according to claim 1, characterized in that: The cylinder pusher is constrained by a guide sleeve to ensure that the steel is pushed in a straight line. The guide sleeve is fixed on the steel storage platform.

5. The hot billet turning and rejection device for a hot rolling mill line according to claim 1, characterized in that: It also includes a roller cover plate, which serves as a mechanical limiting structure and is fixed to the side of the working roller conveyor. The roller cover plate works in conjunction with the cylinder pusher of the steel pushing device to precisely constrain the billet's position.

6. The hot billet turning and rejection device for a hot rolling mill according to claim 1, characterized in that: The steel storage platform is provided in four sets. Each set of steel storage platform has a synchronous shaft bearing seat installation position on the side. A steel plate is erected between the left and right sets of steel storage platforms for the installation of the push cylinder.

7. A hot billet turning and rejection device for a hot rolling line according to claim 6, characterized in that: Two sets of pusher cylinders are installed on the steel plates erected between the left and right sets of steel storage platforms. They are connected to the pneumatic system through a set of pneumatic piping. The pneumatic system includes dual electrically controlled pneumatic slide valves and a pneumatic triplet, which separately control the two sets of pusher cylinders.

8. A hot billet turning and rejection device for a hot rolling line according to claim 7, characterized in that: The material feeding hydraulic cylinder is equipped with a displacement sensor for real-time monitoring of the cylinder's stroke; the hydraulic piping connects to an external hydraulic valve platform, which is equipped with a proportional directional valve, a hydraulic check valve, a solenoid directional valve, and a hydraulic status connector. The proportional directional valve is located at the inlet of the main hydraulic circuit and outputs oil pressure signals in real time through the hydraulic status connector; the pilot-operated check valve is located downstream of the proportional directional valve and achieves oil circuit cutoff and pressure maintenance through the solenoid directional valve; the solenoid directional valve has an independent control oil circuit, which is used to open or lock the pilot-operated check valve; the hydraulic status connector is located at the outlet monitoring point of the proportional directional valve.

9. A hot billet turning and rejection device for a hot rolling mill line according to claim 1, characterized in that: A thermal detector is installed at the outlet of the billet turning and walking position to provide the billet position signal.

10. A hot billet turning and rejection device for a hot rolling mill line according to claim 1, characterized in that: A laser profilometer is installed in the middle of the steel turning roller conveyor to detect surface defects.

Images