A slab continuous lifting system and method

Abstract

The present invention belongs to the technical field of metallurgical continuous casting and rolling steel, and relates to a slab continuous lifting system and method. Through the online transportation subsystem, the lifting transportation subsystem and the hot delivery transportation subsystem connected in sequence, the continuous lifting of the slab is realized, and in each link of the lifting, input and output of the slab, the continuously running conveyor chain rotating in a cycle is adopted, avoiding the time waste caused by the reciprocation of the lifting system itself, greatly saving the time for lifting the slab, thereby increasing the hot delivery ratio of the slab. Moreover, in this system, the slab transportation trays arranged on each conveyor chain at equal intervals are connected and operated without gaps, avoiding scratches on the slab caused by actions such as hydraulic steel pushing or the sliding of the slab on the guide rail, so as to meet the production requirements of high-quality slabs. At the same time, the continuous casting and hot delivery products adopting this method can be extended to the production of high-quality carbon structural steel, alloy steel, stainless steel and other special quality steels.

Description

Technical Field

[0001] The present invention belongs to the technical field of metallurgical continuous casting and rolling, and relates to a slab continuous lifting system and method. Background Art

[0002] In the continuous casting production process of the metallurgical industry, the hot charging method of slabs is an important energy-saving method in the iron and steel metallurgical industry. The national energy-saving code also requires that when designing or renovating a continuous casting workshop, a compact method process and layout with connected equipment should be adopted, and the cast slabs produced in the continuous casting workshop should be directly hot-charged to the heating furnace of the rolling mill through roller tables. Due to the fast production rhythm of rolling, multiple-strand continuous casting machines are usually required to meet the billet supply demand of rolling. When the roller surface elevations of continuous casting and rolling are the same, a traversing trolley can be used to achieve the hot charging of slabs. However, when building or renovating a slab continuous casting machine in an existing workshop, in order to improve the quality of slabs, the radius of the continuous casting machine is usually increased, resulting in the roller surface of the continuous casting machine being lower than that of the rolling mill. Therefore, it is necessary to continuously transport the slabs from the roller surface of the continuous casting machine at a low position to the roller surface of the rolling mill at a high position.

[0003] In the prior art, it is usually adopted to add pawls on the chain of the chain-type steel transporting machine to transport the square billets at a low position to a high position. This is because the aspect ratio of the square billets is small, so even if they are flipped during transportation, it will not cause adverse effects on the equipment and the square billets themselves. However, because the aspect ratio of the slabs is large, the impact force during flipping will damage the equipment and cause safety accidents, and the slabs have high requirements for surface quality. Therefore, the chain-type steel transporting machine system for square billets is not applicable to slabs, and the existing slab lifting systems in the prior art cannot meet the requirement of continuous lifting. For example, Chinese Patent No. 200910168483.5 discloses a chain-type steel transporting machine and a steel transporting system, which solves the problem of square billet lifting by setting pawls on the chain. However, this method will have problems such as slab flipping, the slab being unable to be loaded and unloaded during the slab lifting process, and at the same time, the friction between the slab and the track will cause surface quality defects of the slab; Chinese Patent No. 202220988638.0 discloses a steelmaking continuous casting billet transfer chain bed, which also sets pawls on the chain to limit the sliding of the square billets on the guide rail, meeting the production of square billets with low quality requirements, but it is not suitable for the production of high-quality slabs. For example, Chinese Patent No. 201510257388.8 discloses a slab conveying device with variable tracks, which uses the telescopic method of hydraulic cylinders to realize the loading and hot charging of slabs. During the lifting process, the slabs are transported on the inclined roller table, but this method cannot realize the continuous transportation of slabs, and the telescopic process of the oil cylinders needs to be considered. At the same time, the safety is to be verified when the middle slope is too large.

[0004] Since the processes of slab input / output, lifting, and lowering in the existing slab lifting system are relatively slow, the hot charging ratio of the slab is low, and continuous lifting operations cannot be achieved. In the case of a large height difference and an accelerated rolling production rhythm, the production requirements cannot be met either. Therefore, in actual renovation and new construction projects, a continuous lifting system and method for slabs are needed. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a continuous slab lifting system and method to solve the problems raised in the background technology, while improving the hot charging ratio of the slab, avoiding surface scratches on the slab, and improving the surface quality of the slab.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A continuous slab lifting system includes a feeding transportation subsystem, a lifting transportation subsystem, and a hot charging transportation subsystem that are connected in sequence.

[0008] The feeding transportation subsystem includes a first conveying chain that rotates in a cycle, and a first guiding sprocket and a second guiding sprocket that are arranged at both ends of the first conveying chain and mesh with the first conveying chain. At least one first slab transportation tray is embedded in the first conveying chain at evenly spaced intervals.

[0009] The lifting transportation subsystem includes a second conveying chain that rotates in a cycle, and a third guiding sprocket and a fourth guiding sprocket that are arranged at both ends of the second conveying chain and mesh with the second conveying chain. At least one second slab transportation tray is embedded in the second conveying chain at evenly spaced intervals.

[0010] The hot charging transportation subsystem includes a third conveying chain that rotates in a cycle, and a fifth guiding sprocket and a sixth guiding sprocket that are arranged at both ends of the third conveying chain and mesh with the third conveying chain. At least one third slab transportation tray is embedded in the third conveying chain at evenly spaced intervals.

[0011] The first conveying chain is located between the low-position roller tables, the third conveying chain is located between the high-position roller tables, the second conveying chain is placed obliquely, and the second guiding sprocket and the third guiding sprocket are coaxially connected by a first coupling, and the fourth guiding sprocket and the fifth guiding sprocket are coaxially connected by a second coupling. Moreover, the number ratio of the first slab transportation tray, the second slab transportation tray, and the third slab transportation tray is equal to the length ratio of the first conveying chain, the second conveying chain, and the third conveying chain to achieve the connection of the feeding transportation subsystem, the lifting transportation subsystem, and the hot charging transportation subsystem.

[0012] On the inner sides of the first conveying chain, the second conveying chain, and the third conveying chain, there are respectively provided guiding rails for support and guidance, namely the first guiding rail, the second guiding rail, and the third guiding rail. The first guiding rail and the third guiding rail are both arranged with a slope of not less than 5‰. The height of the first guiding rail at the end close to the second guiding rail is greater than the height at the end far from the second guiding rail, and the height of the third guiding rail at the end close to the second guiding rail is less than the height at the end far from the second guiding rail.

[0013] Furthermore, the first conveying chain, the second conveying chain, and the third conveying chain are each composed of chain guiding wheels with sliding wheels and rims that cooperate with the guiding rails and connecting steel plates. Two adjacent chain guiding wheels form an independent section. At the bottoms of the first slab transportation tray, the second slab transportation tray, and the third slab transportation tray, there are respectively two tray guiding wheels that cooperate with the guiding rails. The two tray guiding wheels are coaxially connected to the two chain guiding wheels within one independent section respectively.

[0014] Furthermore, the lengths of the first slab transportation tray, the second slab transportation tray, and the third slab transportation tray are equal to the length of one independent section of the first conveying chain, the second conveying chain, and the third conveying chain respectively.

[0015] Furthermore, there is a height difference between the two tray guiding wheels in the second slab transportation tray, and the inclination angle formed by the height difference matches the inclination angle of the second conveying chain placed obliquely so that the upper surface of the second slab transportation tray is a horizontal plane.

[0016] Furthermore, the second coupling is connected with a transmission device.

[0017] Furthermore, at the ends of the upper surfaces of the first slab transportation tray and the second slab transportation tray far from the hot delivery transportation subsystem, there are respectively provided side blocks, namely the first side block (110) and the second side block (210).

[0018] A method for continuous lifting of slabs, including the above-mentioned slab continuous lifting system, and the specific steps are as follows:

[0019] S1: Drive the first slab transportation tray through the circulating and rotating first conveying chain. When the first slab transportation tray runs to the position coinciding with the low-position roller table, the first slab transportation tray lifts the slab on the low-position roller table and continues to run forward;

[0020] S2: When the first slab transportation pallet carrying the slab runs to the position where the first coupling is located, one of the second slab transportation pallets embedded in the circulating second conveyor chain synchronously runs to the first coupling, thereby transferring the slab on the first slab transportation pallet to the second slab transportation pallet and continuing to run towards the high-level roller table.

[0021] S3: When the second slab transportation pallet carrying the slab runs to the position where the second coupling is located, one of the third slab transportation pallets embedded in the circulating third conveyor chain synchronously runs to the second coupling, thereby transferring the slab on the second slab transportation pallet to the third slab transportation pallet and continuing to run towards the high-level roller table.

[0022] S4: When the third conveyor chain that rotates in a cycle drives the third slab transportation pallet carrying the slab to run to the position where it coincides with the high-level roller table, the high-level roller table lifts the slab on the third slab transportation pallet, thereby transferring the slab to the high-level roller table.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1. A slab continuous lifting system disclosed by the present invention realizes the continuous lifting of slabs through the sequentially connected online transportation subsystem, lifting transportation subsystem, and hot delivery transportation subsystem. Moreover, in each link of slab lifting, input, and output, continuously running conveyor chains that rotate in a cycle are adopted, avoiding the time waste caused by the reciprocation of the lifting system itself, greatly saving the time for lifting slabs, thereby increasing the hot delivery ratio of slabs, meeting the production requirements of steel rolling, fully utilizing the heat energy of slabs, saving energy consumption, and realizing hot charging and hot delivery of slabs.

[0025] 2. The present invention avoids scratching the slab caused by actions such as hydraulic pusher steel or the sliding of the slab on the guide rail through the seamless connection and operation of the slab transportation pallets, so as to meet the production requirements of high-quality slabs. At the same time, the continuous casting and hot delivery products using this method can be extended to the production of high-quality carbon structural steel, alloy steel, stainless steel, and other special quality steels.

[0026] Other advantages, objectives, and features of the present invention will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in detail preferably with reference to the accompanying drawings, where:

[0028] Figure 1Schematic elevation view of a slab continuous lifting system in an embodiment;

[0029] Figure 2 Schematic elevation view of a slab continuous lifting system in an embodiment;

[0030] Figure 3 Schematic diagram of the second conveyor chain in the lifting and transporting subsystem in an embodiment;

[0031] Figure 4 Schematic view of the first slab transport pallet on the low-level roller table in an embodiment;

[0032] Figure 5 Schematic view of the first slab transport pallet on the high-level roller table in an embodiment;

[0033] Figure 6 Schematic view of the working state of a slab continuous lifting system in an embodiment.

[0034] Reference numerals: upper-line transport subsystem 1, lifting and transporting subsystem 2, hot delivery transport subsystem 3, slab 4, first guiding sprocket 11, first slab transport pallet 12, first conveyor chain 13, first guiding rail 14, first support steel structure 15, second guiding sprocket 16, first coupling 17, first sprocket support base 18, waiting roller table 19, first side stop 110, first slab transport pallet guiding wheel 111, third guiding sprocket 21, second slab transport pallet 22, second conveyor chain 23, second guiding rail 24, second support steel structure 25, fourth guiding sprocket 26, second coupling 27, second sprocket support base 28, transmission device 29, second side stop 210, second slab transport pallet guiding wheel 211, fifth guiding sprocket 31, third slab transport pallet 32, third conveyor chain 33, third guiding rail 34, third support steel structure 35, sixth guiding sprocket 36, coupling 37, third sprocket support base 38, hot delivery roller table 39, third slab transport pallet guiding wheel 311. Detailed implementation manners

[0035] The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0036] Among them, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams rather than actual diagrams, and should not be construed as limiting the present invention; in order to better illustrate the embodiments of the present invention, some components in the accompanying drawings will be omitted, enlarged or reduced, which does not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0037] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0038] Please refer to Figures 1 to 6 , which is a continuous slab lifting system, including an online transportation subsystem 1, a lifting transportation subsystem 2, and a hot delivery transportation subsystem 3 that are connected in sequence; the online transportation subsystem 1 includes a first conveyor chain 13 that rotates in a cycle and first guide sprockets 11 and second guide sprockets 16 that are arranged at both ends of the first conveyor chain 13 and mesh with the first conveyor chain 13. At least one first slab transportation tray 12 is embedded on the first conveyor chain 13 at uniformly spaced intervals; the lifting transportation subsystem 2 includes a second conveyor chain 23 that rotates in a cycle and third guide sprockets 21 and fourth guide sprockets 26 that are arranged at both ends of the second conveyor chain 23 and mesh with the second conveyor chain 23. At least one second slab transportation tray 22 is embedded on the second conveyor chain 23 at uniformly spaced intervals; the hot delivery transportation subsystem 3 includes a third conveyor chain 33 that rotates in a cycle and fifth guide sprockets 31 and sixth guide sprockets 36 that are arranged at both ends of the third conveyor chain 33 and mesh with the third conveyor chain 33. At least one third slab transportation tray 32 is embedded on the third conveyor chain 33 at uniformly spaced intervals;

[0039] The first conveying chain 13 is located between the low-position roller paths, the third conveying chain 33 is located between the high-position roller paths, the second conveying chain 23 is placed obliquely, and the second guide sprocket 16 and the third guide sprocket 21 are coaxially connected by a first coupling 17. The fourth guide sprocket 26 and the fifth guide sprocket 31 are coaxially connected by a second coupling 27. Moreover, the number ratio of the first slab transport trays 12, the second slab transport trays 22, and the third slab transport trays 32 is equal to the length ratio of the first conveying chain 13, the second conveying chain 23, and the third conveying chain 33, that is, the spacing between the slab transport trays on each conveying chain is the same. Thus, when each conveying chain has the same running speed, the slab transport trays on each conveying chain can reach the apex in the first coupling or the second coupling simultaneously, so as to realize the connection between the slab transport trays in the online transport subsystem 1, the lifting transport subsystem 2, and the hot delivery transport subsystem 3. Guide rails for support and guidance are provided inside the first conveying chain 13, the second conveying chain 23, and the third conveying chain 33, which are the first guide rail 14, the second guide rail 24, and the third guide rail 34 respectively. Moreover, both the first guide rail 14 and the third guide rail 34 are arranged with a slope of not less than 5‰. The height of the first guide rail 14 at the end close to the second guide rail 24 is greater than the height at the end far from the second guide rail 24, and the height of the third guide rail 34 at the end close to the second guide rail 24 is less than the height at the end far from the second guide rail 24.

[0040] Correspondingly, a first support steel structure 15, a second support steel structure 25, and a third support steel structure 35 are provided below the first guide rail 14, the second guide rail 24, and the third guide rail 34 respectively. And a first sprocket support base 18 is provided correspondingly below the first guide sprocket 11 and the second guide sprocket 16. A second sprocket support base 28 is provided below the third guide sprocket 21 and the fourth guide sprocket 26. A third sprocket support base 38 is provided below the fifth guide sprocket 31 and the sixth guide sprocket 36, thereby ensuring the support stability of the system.

[0041] Specifically, the second coupling 27 is connected to a transmission device 29. When the transmission device 29 drives the second coupling 27 to rotate, it drives the fourth guide sprocket 26 and the fifth guide sprocket 31 to rotate. The fourth guide sprocket 26 and the fifth guide sprocket 31 then drive the third guide sprocket 21 and the sixth guide sprocket 36 to rotate through the second conveyor chain 23 and the third conveyor chain 33 respectively. The third guide sprocket 21 drives the second guide sprocket 16 to rotate through the first coupling 17, and the second guide sprocket 16 then drives the first guide sprocket 11 to rotate through the first conveyor chain 13. Thus, the three subsystems form a coordinated whole with good synchronism; the low-level roller path is the waiting roller path 19 or the collecting bench, and the high-level roller path is the hot delivery roller path 39. The transmission device 29 can specifically be set as a drive motor with a speed reducer.

[0042] In this embodiment, the first conveyor chain 13, the second conveyor chain 23, and the third conveyor chain 33 are all composed of chain guide wheels with sliding wheels and rims and cooperating with the guide rails, and connecting steel plates. Two adjacent chain guide wheels form an independent link. The bottoms of the first slab transport tray 12, the second slab transport tray 22, and the third slab transport tray 32 all have two tray guide wheels cooperating with the guide rails. The two tray guide wheels are coaxially connected to the two chain guide wheels in one independent link respectively; the lengths of the first slab transport tray 12, the second slab transport tray 22, and the third slab transport tray 32 are equal to the length of one independent link in the first conveyor chain 13, the second conveyor chain 23, and the third conveyor chain 33. That is, the length L1 of the independent link in the conveyor chain is exactly the same as the length L1 of the slab transport tray, so that the conveyor chain with the slab transport tray embedded forms a closed loop with the slab transport tray. Thus, when the transmission device 29 operates continuously, each conveyor chain can also rotate continuously, and the operation rhythms of each subsystem are consistent, and the purpose of continuously lifting the slab can be achieved.

[0043] Preferably, the two tray guide wheels in the second slab transport tray 22 have a height difference, and the inclination angle formed by the height difference matches the inclination angle of the second conveyor chain 23 placed obliquely so that the upper surface of the second slab transport tray 22 is horizontal.

[0044] Preferably, side blocks are provided at one ends of the upper surfaces of the first slab transport tray 12 and the second slab transport tray 22 away from the hot delivery transport subsystem 3, namely the first side block 110 and the second side block 210 respectively, to ensure the lifting effect of the slab, prevent slippage during transportation, and ensure that the slab 4 is properly connected during the connection of each slab transport tray. And the heights of the first side block 110 and the second side block 210 are ≤50 mm.

[0045] Specifically, in this embodiment, four first conveyor chains 13, four second conveyor chains 23, and four third conveyor chains 33 are respectively provided in the online transportation subsystem 1, the lifting transportation subsystem 2, and the hot delivery transportation subsystem 3. Each of the above conveyor chains is spaced between the low-level roller paths or high-level roller paths to meet the length requirements of the slab 4. According to the different lengths of the slab 4, more or fewer conveyor chains can be correspondingly set. The length of the slab transportation tray corresponds to the width of the slab 4, and the length of the slab transportation tray is greater than the width of the slab 4; the slab refers to a continuous casting billet with an aspect ratio greater than 2.5.

[0046] A method for continuous lifting of slabs, including the above-mentioned slab continuous lifting system, and its specific steps are as follows:

[0047] S1: The first slab transportation tray 12 is driven by the continuously rotating first conveyor chain 13. When the first slab transportation tray 12 runs to a position coinciding with the low-level roller path (waiting roller path 19), the center line of the tray of the first slab transportation tray 12 overlaps with the center line of the waiting station, and the horizontal lines overlap. The first slab transportation tray 12 continues to run on the first guiding rail 14 with a slope of not less than 5‰ and upward. The first slab transportation tray 12 lifts the slab 4 naturally placed on the waiting roller path 19 and continues to run forward;

[0048] S2: When the first slab transportation tray 12 carrying the slab 4 runs to the position of the first coupling 17, one of the second slab transportation trays 22 embedded in the continuously rotating second conveyor chain 23 synchronously runs to the first coupling 17. Since the second guiding sprocket 16 and the second guiding sprocket 21 are coaxially installed through the first coupling 17, at this time, the slab 4 is exactly supported by the second slab transportation tray 22, while the first slab transportation tray 12 bypasses the second guiding sprocket 16 and continues to rotate continuously, thereby transferring the slab on the first slab transportation tray 12 to the second slab transportation tray 22 and continuing to run towards the high-level roller path (hot delivery roller path 39);

[0049] S3: When the second slab transportation tray 22 carrying the slab runs to the position of the second coupling 27, one of the third slab transportation trays 32 embedded in the continuously rotating third conveyor chain 33 synchronously runs to the second coupling 27, thereby transferring the slab on the second slab transportation tray 22 to the third slab transportation tray 32. The principle is the same as that of S2, and it continues to run towards the high-level roller path;

[0050] S4: When the third conveying chain 33 that rotates cyclically drives the third slab transport pallet 32 carrying the slab to run to the position where it coincides with the high-level roller path, the center line of the third slab transport pallet 32 overlaps with the center line of the hot delivery roller path 39. The horizontal third slab transport pallet 32 naturally places the slab 4 on the hot delivery roller path 39, thereby transferring the slab from the low-level roller path (waiting roller path 19) to the high-level roller path (hot delivery roller path 39).

[0051] Specifically, the width of the slab 4 is 600 mm. The structures of the guiding sprockets are the same. The guiding sprockets are designed to be equally divided into 8 parts, with each equal division angle being 45°. The chord length of each equal division is equal to the length of an independent link in the conveying chain and also equal to the length of the slab transport pallet. The upper width of the slab transport pallet can be set to 650 mm, so as to ensure the meshing of the conveying chain and the guiding sprocket. According to the transport rhythm of the slab 4, the distance L between the slab transport pallets can be correspondingly adjusted. The smaller the distance, the faster the transport rhythm, and the total length of the conveying chains of each subsystem should be an integer multiple of L. In this embodiment, the distance L between the slab transport pallets is 6 m, the total length of the second conveying chain 23 is 8L, the total length of the first conveying chain 13 is 2L, and the total length of the third conveying chain 33 is 2L. The operating linear speed of each conveying chain is 12 m / min. Then, this system only needs 30 s to transfer the slab 4 from the low-level roller path to the high-level roller path.

[0052] Preferably, the roller speed of the hot delivery roller path 39 is not less than 30 m / min, which is convenient for promptly hot delivering the slab to the steel rolling process to improve the hot delivery ratio of the slab.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A slab continuous lifting system, characterized in that: It includes an upper-line transportation subsystem (1), a lifting transportation subsystem (2), and a hot delivery transportation subsystem (3) that are connected in sequence. The upper-line transportation subsystem (1) includes a first conveyor chain (13) that rotates in a cycle, and a first guiding sprocket (11) and a second guiding sprocket (16) that are arranged at both ends of the first conveyor chain (13) and mesh with the first conveyor chain (13). At least one first slab transportation tray (12) is embedded in the first conveyor chain (13) and is evenly spaced. The lifting transportation subsystem (2) includes a second conveyor chain (23) that rotates in a cycle, and a third guiding sprocket (21) and a fourth guiding sprocket (26) that are arranged at both ends of the second conveyor chain (23) and mesh with the second conveyor chain (23). At least one second slab transportation tray (22) is embedded in the second conveyor chain (23) and is evenly spaced. The hot delivery transportation subsystem (3) includes a third conveyor chain (33) that rotates in a cycle, and a fifth guiding sprocket (31) and a sixth guiding sprocket (36) that are arranged at both ends of the third conveyor chain (33) and mesh with the third conveyor chain (33). At least one third slab transportation tray (32) is embedded in the third conveyor chain (33) and is evenly spaced. The first conveyor chain (13) is located between the low-position roller tables, the third conveyor chain (33) is located between the high-position roller tables, the second conveyor chain (23) is placed obliquely, and the second guiding sprocket (16) and the third guiding sprocket (21) are coaxially connected by a first coupling (17), and the fourth guiding sprocket (26) and the fifth guiding sprocket (31) are coaxially connected by a second coupling (27). Moreover, the number ratio of the first slab transportation tray (12), the second slab transportation tray (22), and the third slab transportation tray (32) is equal to the length ratio of the first conveyor chain (13), the second conveyor chain (23), and the third conveyor chain (33), so as to realize the connection of the upper-line transportation subsystem (1), the lifting transportation subsystem (2), and the hot delivery transportation subsystem (3). Guiding rails for support and guidance are provided on the inner sides of the first conveyor chain (13), the second conveyor chain (23), and the third conveyor chain (33), which are the first guiding rail (14), the second guiding rail (24), and the third guiding rail (34) respectively. The first guiding rail (14) and the third guiding rail (34) are both arranged with a slope of not less than 5‰. The height of the first guiding rail (14) at the end close to the second guiding rail (24) is greater than the height at the end far from the second guiding rail (24), and the height of the third guiding rail (34) at the end close to the second guiding rail (24) is less than the height at the end far from the second guiding rail (24).

2. The continuous slab lifting system according to claim 1, characterized in that: The first conveying chain (13), the second conveying chain (23), and the third conveying chain (33) are all composed of chain guide wheels with sliding wheels and rims that cooperate with the guiding rails and connecting steel plates. Two adjacent chain guide wheels form an independent section. The bottoms of the first slab transport tray (12), the second slab transport tray (22), and the third slab transport tray (32) all have two tray guide wheels that cooperate with the guiding rails, and the two tray guide wheels are coaxially connected to the two chain guide wheels within the one independent section respectively.

3. A slab continuous lifting system according to claim 2, characterized in that: The lengths of the first slab transport tray (12), the second slab transport tray (22), and the third slab transport tray (32) are equal to the length of one independent section of the first conveying chain (13), the second conveying chain (23), and the third conveying chain (33).

4. A continuous slab lifting system according to claim 3, characterized in that: The two tray guide wheels in the second slab transport tray (22) have a height difference, and the inclination angle formed by the height difference matches the inclination angle of the inclined placement of the second conveying chain (23) so that the upper surface of the second slab transport tray (22) is a horizontal plane.

5. A continuous slab lifting system according to claim 1, wherein: The second coupling (27) is connected with a transmission device (29).

6. A continuous slab lifting system according to claim 1, characterized in that: At one end of the upper surfaces of the first slab transport tray (12) and the second slab transport tray (22) away from the hot delivery transport subsystem (3), side blocks are provided, namely the first side block (110) and the second side block (210) respectively.

7. A continuous slab lifting method, characterized in that, It includes the slab continuous lifting system described in any one of claims 1 to 6, and the specific steps are as follows: S1: The first conveying chain (13) that rotates in a cycle drives the first slab transport tray (12). When the first slab transport tray (12) runs to a position coinciding with the low-level roller table, the first slab transport tray (12) lifts the slab on the low-level roller table and continues to run forward; S2: When the first slab transport tray (12) carrying the slab runs to the position where the first coupling (17) is located, one of the second slab transport trays (22) embedded in the second conveying chain (23) that rotates in a cycle synchronously runs to the first coupling (17), thereby transferring the slab on the first slab transport tray (12) to the second slab transport tray (22) and continuing to run towards the high-level roller table; S3: When the second slab transport tray (22) carrying the slab runs to the position where the second coupling (27) is located, one of the third slab transport trays (32) embedded in the third conveying chain (33) that rotates in a cycle synchronously runs to the second coupling (27), thereby transferring the slab on the second slab transport tray (22) to the third slab transport tray (32) and continuing to run towards the high-level roller table; S4: When the third conveying chain (33) that rotates in a cycle drives the third slab transport tray (32) carrying the slab to run to a position coinciding with the high-level roller table, the high-level roller table lifts the slab on the third slab transport tray (32), thereby transferring the slab to the high-level roller table.

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