A method and system for shortening the steel loading gap time in hot charging and direct rolling

Abstract

The present invention provides a method and a system for shortening the steel loading gap time in hot charging and direct charging. The method for shortening the steel loading gap time in hot charging and direct charging includes the following steps: S1: Collect information on the first stack position sequence of the steel billets conveyed onto the roller table within a time period t1 equal to the steel loading gap time before the start of steel loading in the same batch, and correspondingly establish a first virtual stack position sequence identical to the first stack position sequence in sequence; S2: Control the temporary offline of the steel billets on the conveying roller table, and stack them in sequence according to the first virtual stack position sequence; S3: Collect information on the second stack position sequence of the steel billets within a time period t2 after the start of steel loading, and correspondingly establish a second virtual stack position sequence identical to the second stack position sequence in sequence. The present invention can shorten the steel loading time gap in the hot charging and direct charging process and utilize this steel loading time gap for continuous steel loading.

Description

Technical Field

[0001] The present invention relates to the technical field of steel rolling production, and particularly to a method and system for shortening the steel loading gap time of hot charging and direct charging. Background Art

[0002] In the hot charging and direct charging process of the hot coil production line in a steel rolling mill, the steelmaking plant sends slab billets directly to the steel rolling mill through continuous casting according to the casting plan, and the steel rolling mill directly loads them into the heating furnace. Since the temperature of the hot charged and directly charged slab billets is above 600°C, directly loading them into the heating furnace can effectively save the heating time, improve the rolling production efficiency, and reduce the heating energy consumption. In theory, the steel grades and specifications of the slab billets in the same casting are the same.

[0003] The existing problems with hot charging and direct charging of slab billets are as follows:

[0004] 1. The hot charging and direct charging furnace loading plan is strictly executed according to the prepared plan, and the order cannot be changed. If the steel loading order of the slab billets is changed, it will directly lead to the failure of the hot charging and direct charging plan;

[0005] 2. The hot charging and direct charging plan cannot take the slab billets offline temporarily and can only stay on the steel billet conveying roller table, which is prone to steel billet collision accidents;

[0006] 3. The hot charging and direct charging is strictly executed according to the plan, but since the steel delivery speed of the steelmaking plant cannot keep up with the steel loading speed of the heating furnace in the steel rolling mill, it will cause the heating furnace to wait for the steel delivery from the steelmaking plant during the steel loading process, seriously affecting the rolling production rhythm;

[0007] 4. The continuous waiting affects the improvement of production capacity, and at the same time increases the energy consumption, greatly increasing the production cost. Summary of the Invention

[0008] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a method and system for shortening the steel loading gap time of hot charging and direct charging, which is used to solve the technical problem that the number of steel billets delivered by the steelmaking plant per hour is less than the number of steel billets loaded into the furnace per hour during hot charging and direct charging in the prior art, resulting in a long steel loading gap time.

[0009] To achieve the above purpose and other related purposes, the present invention provides a method for shortening the steel loading gap time of hot charging and direct charging, including the following steps:

[0010] S1: Collect the information of the first stack position sequence of the slab billets conveyed to the roller table within the time period t1 equal to the steel loading gap time before the start of steel loading in the same batch, and correspondingly establish a first virtual stack position sequence that is the same as the first stack position sequence in turn;

[0011] S2: Control the slab billets on the conveying roller table to be taken offline temporarily and stack them in turn according to the first virtual stack position sequence;

[0012] S3: collecting information on the second stacking sequence of the steel billets within a time period t2 after the start of the steel loading, and correspondingly establishing a second virtual stacking sequence that is the same as the second stacking sequence;

[0013] S4: Determine whether the supply of the steel billets delivered to the roller conveyor within the time period t2 meets the demand for hot delivery and direct loading. If not, replace the steel billet stack information corresponding to the steel billet stack information delivered to the roller conveyor within the time period t1 in the second virtual stack sequence with the steel billet stack information corresponding to the first virtual stack sequence, and put the steel billets that have been temporarily taken offline back online to the roller conveyor in sequence in the reverse order of the first virtual stack sequence, arrange the steel billets that have been put back online in the reverse order of the first virtual stack sequence, and load them in sequence.

[0014] In one embodiment of the present invention, the steel billets in the same batch in S1 are steel billets of the same steel grade and specification and are used to execute the same hot delivery direct loading plan.

[0015] In one embodiment of the present invention, rolling of other batches of steel billets in the hot delivery and direct loading plan is carried out during the time period t1 in S1.

[0016] In one embodiment of the present invention, in S1 and S3, the total time of the hot delivery direct installation plan is t=t1+t2.

[0017] In one embodiment of the present invention, the first virtual stack position sequence in S1 is recorded as (1, 2, ..., N), the second virtual stack position sequence in S2 is recorded as (N+1, N+2, ..., N+M), and S4 also includes:

[0018] When N≤M, the control selects N steel billets to be temporarily offline;

[0019] When N>M, the track stack position is controlled to exchange information with the steel billet stack position temporarily offline.

[0020] In one embodiment of the present invention, the sequentially performing the steel loading in S4 includes: directly loading steel according to the hot delivery direct loading plan before the start of the steel loading.

[0021] In one embodiment of the present invention, in S4, the reverse order of the first virtual stacking sequence is the order of cranes for the steel billets from top to bottom after they are temporarily taken offline to be stacked in the warehouse.

[0022] In one embodiment of the present invention, after S4, the process further includes: controlling the steel billet loading sequence of the temporarily offline steel billets to be adjusted accordingly with the sequence of the hot delivery direct loading plan.

[0023] In an embodiment of the present invention, the adjustment of the charging order of the temporarily offline billets corresponding to the order of the hot charging and direct charging plan includes:

[0024] Changing the first virtual stack position order of the temporarily offline billets to the second virtual stack position order corresponding to the gap time on the roller table.

[0025] The present invention also provides a system for shortening the charging gap time of hot charging and direct charging, including:

[0026] An offline stack position building module, which collects the information of the first stack position order of the billets transported to the roller table within a time period t1 equal to the charging gap time before the start of charging in the same batch, and correspondingly and sequentially establishes a first virtual stack position order identical to the first stack position order;

[0027] A temporary offline control module, which controls the temporary offline of the billets on the conveying roller table and stacks them sequentially according to the first virtual stack position order;

[0028] A stack position information exchange module, which collects the information of the second stack position order of the billets within a time period t2 after the start of charging, and correspondingly and sequentially establishes a second virtual stack position order identical to the second stack position order;

[0029] An online judgment module, which judges whether the billet supply of the billets transported to the roller table within the time period t2 meets the requirements of hot charging and direct charging. If not, it replaces the billet stack position information corresponding to the billets transported to the roller table within the time period t1 in the second virtual stack position order with the billet stack position information corresponding to the first virtual stack position order, reinserts the temporarily offline billets onto the roller table sequentially in the reverse order of the first virtual stack position order, arranges the reinserted billets in the reverse order of the first virtual stack position order, and sequentially performs the charging.

[0030] As described above, the method for shortening the charging gap time of hot charging and direct charging provided by the present invention has the following beneficial effects:

[0031] By temporarily diverting the billets of the same batch transported from the steel mill to the warehouse for storage during the time period t1 before the start of steel charging, and after the diversion, exchanging the virtual stack sequence of the continuously transported billets with the sequence of the temporarily diverted billets, the sequence of the hot direct charging plan for the billets is changed; when the steel charging and rolling speed is greater than the speed of the hot transported billets, i.e., there is a steel charging gap time, by reintroducing the billets from the temporarily diverted warehouse and changing the virtual stack sequence of the reintroduced billets according to the hot direct charging plan sequence, while adjusting the hot direct charging plan sequence of the reintroduced billets, continuous steel charging and rolling are achieved using the billets in the warehouse during the steel charging gap time, thereby making use of this steel charging gap time. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a flowchart of the method for shortening the steel charging gap time of the hot direct charging of the present invention.

[0033] Figure 2 It shows a schematic diagram of the billet transportation sequence when the steel mill starts charging a batch of billets according to the present invention;

[0034] Figure 3 It shows a schematic diagram of the stacking sequence state of the temporarily diverted billets in the warehouse during the time period t1 according to the present invention;

[0035] Figure 4 It shows a schematic diagram of the billet transportation sequence when steel charging is about to start after the time period t1 according to the present invention;

[0036] Figure 5 It shows a schematic diagram of the virtual stack layout of the billets when they are temporarily diverted and stacked in the warehouse;

[0037] Figure 6 It shows a schematic diagram of the exchange of virtual stack information between the temporarily diverted billets and the billets on the roller table;

[0038] Figure 7 It shows a schematic diagram of the process of adjusting the virtual stack sequence when the temporarily diverted billets are reintroduced;

[0039] Figure 8 It is an architecture diagram of the system for shortening the steel charging gap time of the hot direct charging of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0040] The following specific examples 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 other 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, without conflict, the following embodiments and the features in the embodiments can be combined with each other. It should also be understood that the terms used in the embodiments of the present invention are for describing specific implementation manners and are not intended to limit the protection scope of the present invention. The test methods without specific conditions noted in the following embodiments are generally carried out under conventional conditions or according to the conditions recommended by each manufacturer.

[0041] Please refer to Figures 1 to 8 . It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not intended to limit the implementation conditions of the present invention. Therefore, they do not have any technical substantial meaning. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration and are not intended to limit the implementation scope of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the implementation scope of the present invention.

[0042] Please refer to Figure 1 , the present invention provides a method for shortening the steel loading gap time in hot charging and direct rolling, including the following steps:

[0043] S1: Collect the information of the first stack position sequence of the steel billets conveyed onto the roller table within the time period t1 equal to the steel loading gap time before the start of steel loading in the same batch, and correspondingly establish a first virtual stack position sequence that is the same as the first stack position sequence in turn;

[0044] S2: Control the temporary offline of the steel billets on the conveying roller table and stack them in turn according to the first virtual stack position sequence;

[0045] S3: Collect the information of the second stack position sequence of the steel billets within the time period t2 after the start of steel loading, and correspondingly establish a second virtual stack position sequence that is the same as the second stack position sequence in turn;

[0046] S4: Determine whether the supply of steel billets delivered to the roller during the time period t2 meets the demand for hot delivery and direct loading. If not, replace the steel billet stack information corresponding to the steel billet stack information delivered to the roller during the time period t1 in the second virtual stack sequence with the steel billet stack information corresponding to the first virtual stack sequence, and put the steel billets that have been temporarily taken offline back online to the roller in the reverse order of the first virtual stack sequence. Arrange the steel billets that have been put back online in the reverse order of the first virtual stack sequence and load them with steel in sequence.

[0047] In one embodiment of the present invention, during the hot delivery and direct loading process under the same rolling plan, after the steel mill refines the molten steel into steel billets, it is delivered to the steel mill by hot delivery for steel rolling. During the roller hot delivery process, the same batch of steel billets will be delivered to the warehouse for storage in advance in the t1 time period when the hot delivery starts, and the steel billets stored in the warehouse will establish a first virtual stacking position order corresponding to the first stacking position order. At the end of the t1 time period, the steel mill continues to hot deliver the steel billets through the roller, and the steel mill starts to load steel in this t2 time period, and establishes a second virtual stacking position order corresponding to the second stacking position order according to the second stacking position order of the steel billets to be loaded, and when it is judged that the supply of steel billets after loading on the roller is less than the demand, the steel billets temporarily offline are supplemented to the roller, and at the same time, the steel billets after being put on the line are arranged according to the second stacking position order, that is, the steel billets that are put back on the line are arranged in the opposite order of the first virtual stacking position order, and are loaded in sequence.

[0048] like Figure 2 As shown, when the corresponding hot delivery direct loading plan is started for a batch of steel billets, the molten steel is smelted in the steel rolling mill according to the hot delivery direct loading plan to obtain the corresponding steel billets, which are then arranged in the stacking sequence A, B, C, D..., and then delivered to the steel rolling mill in the stacking sequence (A, B, C, D...) according to the hot delivery direct loading plan for on-line loading.

[0049] Among them, hot delivery and direct loading technology refers to the process of hot delivery of steel billets cast by continuous casting machines to rolling mills at the highest possible temperature and loading them into heating furnaces. This process technology is a comprehensive technology integrating a series of technologies such as production planning, molten steel smelting, continuous steel casting, billet transportation, hot rolling and scheduling management.

[0050] The main process of hot delivery direct charging is: hot delivery direct charging plan preparation → molten steel smelting → continuous ingot casting → ingot conveying → entering the steel rolling heating furnace.

[0051] Figure 3Among them, before the billet is hot-delivered to the steelmaking plant for charging, it is necessary to temporarily offline the billet hot-delivered on the roller table within the time period t1 equal to the charging interval time. And after offline, the billets hot-delivered in the stack order (A, B, C, D) are lifted into the warehouse for storage by a crane, and the stacking order during storage is from bottom to top as (A, B, C, D).

[0052] As Figure 4 shown, during the conveying process of the billets arranged in the stack order A, B, C, D, E, F, G, H by the roller table, after A, B, C, D are temporarily offline, the roller table continuously conveys E, F, G, H to the steel charging of the rolling mill.

[0053] The billets of the same batch in step S1 are billets of the same steel type, the same specification and used to execute the same hot direct charging plan. It is strictly implemented according to the compiled plan according to the hot direct charging furnace plan, and the order cannot be changed. If the charging order of the billets is changed, it will directly lead to the failure of the hot direct charging plan.

[0054] In the t1 time period in S1, the rolling of billets of other batches in the hot direct charging plan is carried out.

[0055] In an embodiment of the present invention, when the previous batch of billets is hot-delivered within the t1 time period, the hot-delivered billets will be directly temporarily offline to the warehouse for storage. During this process, within the charging interval time (t1), in order to ensure the continuity of the production of the rolling mill, the hot direct charging plan of other batches of billets can be carried out, and the corresponding work rolls used for other contract billets can also be replaced according to needs. In addition, the sum of the time for replacing the work rolls and the time for rolling other batches of billets should be less than the charging interval time t1 in the middle.

[0056] In steps S1 and S3, the total time t of the hot direct charging plan = t1 + t2.

[0057] In an embodiment of the present invention, the hot direct charging plan includes two parts: steelmaking and rolling. Among them, in the hot direct charging plan of the same batch of billets, the steelmaking time t3 is equal to the total time of the hot direct charging plan, that is, t3 = t1 + t2. The steelmaking time t3 is greater than the rolling time t2 required, and there is an interval time t1.

[0058] In step S1, the first virtual stack order is sequentially recorded as (1, 2,..., N), in S2, the second virtual stack order is sequentially recorded as (N + 1, N + 2,..., N + M), and S4 also includes:

[0059] When N ≤ M, control to select N billets to be temporarily offline;

[0060] When N > M, control to exchange the information of the track stack and the stack of temporarily offline billets.

[0061] In step S4, the steel charging is carried out in sequence, including: directly charging the steel according to the hot charging and direct charging plan before the start of steel charging.

[0062] In an embodiment of the present invention, the steel charging plan for hot charging and direct charging is the plan for transporting billets and rolling sequence that has been arranged in the steel mill before the start of steel charging.

[0063] In step S4, the reverse order of the first virtual stack position sequence is the crane lifting sequence of the billets from top to bottom after temporarily offline to the warehouse stack.

[0064] In an embodiment of the present invention, when the billets temporarily offline from the roller table are stacked in the warehouse, the billets will be arranged in the stacking order from bottom to top, and the virtual stack positions of the billets will also be arranged from bottom to top according to the stacking order. When it is necessary to go online, in order to ensure the convenience of going online and the billets are of the same batch, the billets will be taken out of the warehouse from top to bottom by crane and put online to the roller table, and this online order will also be adjusted to the reverse order of the temporary offline order.

[0065] After step S4, it further includes: controlling the steel charging order of the temporarily offline billets to make a corresponding adjustment to the order of the hot charging and direct charging plan.

[0066] Controlling the steel charging order of the temporarily offline billets to make a corresponding adjustment to the order of the hot charging and direct charging plan includes:

[0067] Replacing the first virtual stack position sequence of the temporarily offline billets with the corresponding second virtual stack position sequence on the roller table during the gap time.

[0068] In an embodiment of the present invention, when the temporarily offline billets are put online for steel charging, not only can the gap time during the hot charging and direct charging plan be supplemented for steel charging, but also since the rolling plan of the temporarily offline billets still exists, it is necessary to adjust to carry out rolling production according to the rolling contract order of hot charging and direct charging on the roller table after going online.

[0069] In step S4, replacing the billet stack position information corresponding to the billets transported to the roller table during the time period t1 in the second virtual stack position sequence with the billet stack position information corresponding to the first virtual stack position sequence includes: replacing the billet contract number and sequence number. Among them, the billet contract number is the numbered information corresponding to the rolling contract. That is to say, when there are different rolling contracts in the warehouse but the types and specifications (such as length dimensions) of the billets are the same, they can be put online and replaced with the contract numbers of other rolling contracts. The sequence number during rolling is the sequence number during hot charging after steelmaking.

[0070] Such as Figure 5As shown in the figure, during the hot delivery process of billets from the steelmaking plant, for example, billets (A, B, C, D, E, F, G, H) are transported in the order of the hot delivery direct charging preparation plan of the steelmaking plant, that is, the second virtual stack position order (1, 2, 3, 4, 5, 6, 7, 8). And before being sent to the rolling mill, it is necessary to temporarily take offline some billets (A, B, C, D) to the warehouse in advance by time t1. And they are stacked from bottom to top according to the transportation order of the billets on the roller table, that is, the order from bottom to top is (1, 2, 3, 4), to obtain the first virtual stack position order of the temporarily taken offline billets.

[0071] As Figure 6 , after the billets (A, B, C, D) are taken offline, in order to ensure that the rolling plan for transporting billets (E, F, G, H) on the roller table subsequently can be carried out in the order of the hot delivery direct charging plan (1, 2, 3, 4, 5, 6, 7, 8). And the charging plan order of the billets (E, F, G, H) to be charged soon is (5, 6, 7, 8). Furthermore, it is necessary to carry out the billets (E, F, G, H) to be charged first in the order of the hot delivery direct charging plan (1, 2, 3, 4, 5, 6, 7, 8). That is, the charging plan order of the billets (E, F, G, H) is adjusted to (1, 2, 3, 4) for charging and rolling. And at this time, the charging plan order of the temporarily taken offline billets (A, B, C, D) is also adjusted from the original (1, 2, 3, 4) to the charging plan order (5, 6, 7, 8) of the original billets (E, F, G, H) when being replaced.

[0072] As Figure 7 As shown in the figure, since the rolling speed of the billets during charging is greater than the hot delivery speed of the billets from the steelmaking plant, the billets on the roller table cannot meet the charging and rolling speed of the rolling mill. At this time, the billets (A, B, C, D) stacked from bottom to top [corresponding to the charging plan order (5, 6, 7, 8)] will be re - put onto the roller table to complete the supplementary charging for the gap time. And when re - charging at this time, since the stacking order from bottom to top in the warehouse is (A, B, C, D), when re - putting onto the line, it is carried out from top to bottom, that is, (D, C, B, A). And since the billets (E, F, G, H) have been charged in the previous charging plan and the billets (E, F, G, H) have already corresponded to the completion of the charging plan order (1, 2, 3, 4). Therefore, the charging plan order of the re - put - onto - the - line billets (D, C, B, A) is adjusted to (5, 6, 7, 8). The first virtual stack position order of the billets (D, C, B, A) stacked from top to bottom in the warehouse to be re - put onto the line is adjusted to (5, 6, 7, 8) in turn, and then lifted by crane onto the roller table for charging.

[0073] As Figure 8 As shown in the figure, the present invention also provides a system for shortening the charging gap time of hot delivery direct charging, including:

[0074] Offline stacking position building module. The offline stacking position building module collects information on the first stacking position sequence of the billets transported to the roller table within the time period t1 equal to the steel loading interval time before the start of the steel loading of the same batch, and correspondingly establishes a first virtual stacking position sequence that is the same as the first stacking position sequence in turn.

[0075] Temporary offline control module. The temporary offline control module controls the temporary offline of the billets on the conveying roller table and stacks them in turn according to the first virtual stacking position sequence.

[0076] Stacking position information exchange module. The stacking position information exchange module collects information on the second stacking position sequence of the billets within the time period t2 after the start of the steel loading, and correspondingly establishes a second virtual stacking position sequence that is the same as the second stacking position sequence in turn.

[0077] Online judgment module. The online judgment module judges whether the billet supply of the billets transported to the roller table within the time period t2 meets the requirements of hot charging and direct loading. If not, it replaces the billet stacking position information corresponding to the billets transported to the roller table within the time period t1 in the second virtual stacking position sequence with the billet stacking position information corresponding to the first virtual stacking position sequence, reinserts the temporarily offline billets onto the roller table in turn in the reverse order of the first virtual stacking position sequence, arranges the reinserted billets in the reverse order of the first virtual stacking position sequence, and loads the billets in turn.

[0078] In an embodiment of the present invention, in the process of controlling the offline and online of billets and the exchange of virtual stacking positions, the offline stacking position building module establishes a first virtual stacking position sequence for the temporarily offline billets before the steel loading of the same batch after steelmaking, and through the temporary offline control module, controls the billets transported to the roller table in the first virtual stacking position sequence to be offline to the warehouse for stacking within the time period t1. At the same time, the stacking position information exchange module will, at the end of the time period t1, that is, when entering the time period t2 of the steel loading plan, re - compile the stacking position sequence corresponding to the steel loading for the billets on the roller table, and then establish a second virtual stacking position sequence according to this stacking position sequence. Then, the online judgment module judges whether the billets for steel loading on the roller table within the time period t2 meet the steel loading requirements. If not, it will online the billets temporarily offline in the warehouse and adjust the corresponding virtual stacking position sequence of the reinserted billets to the sequence corresponding to the hot charging and direct loading plan on the roller table for steel loading.

[0079] In summary, before steelmaking in the steel mill, the billets for hot delivery after steelmaking are stored in the warehouse in advance for a time period of t1, and a first virtual stack position is established. Then, when the billets for hot delivery continue after the time period of t1, the billets for continued hot delivery are charged into the furnace in accordance with the hot delivery and direct charging plan sequence formulated originally, and the billets are charged into the rolling mill after adjustment of the corresponding second virtual stack position, thus realizing the change of the planned sequence of the billets during hot delivery and direct charging. Since the charging and rolling speed is greater than the steelmaking and hot delivery speed, therefore, by reintroducing the billets temporarily stored in the warehouse onto the roller table, supplementing the billets during the hot delivery gap time, and adjusting the hot delivery and direct charging plan sequence of the reintroduced billets to the second virtual stack position corresponding to the conveying sequence on the roller table, while ensuring the continuous progress of the charging plan, the change of the sequence plan of the billets in accordance with the hot delivery and direct charging plan is also realized. Therefore, the present invention effectively overcomes various disadvantages in the prior art and has high industrial utilization value.

[0080] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A method for shortening the steel loading gap time of hot charging and direct rolling, characterized in that, It includes the following steps: S1: Collect the information of the first stack position sequence of the billets conveyed onto the roller table within the time period t1 equal to the steel charging gap time before the start of steel charging in the same batch, and correspondingly establish a first virtual stack position sequence identical to the first stack position sequence in sequence; S2: Control to temporarily take the billets on the conveying roller table offline and stack them in sequence according to the first virtual stack position sequence; S3: Collect the information of the second stack position sequence of the billets within the time period t2 after the start of steel charging, and correspondingly establish a second virtual stack position sequence identical to the second stack position sequence in sequence; S4: Judge whether the billet supply of the billets conveyed onto the roller table within the time period t2 meets the requirements of the hot direct charging steel charging. If not, replace the billet stack position information corresponding to the billets conveyed onto the roller table within the time period t1 in the second virtual stack position sequence with the billet stack position information corresponding to the first virtual stack position sequence, re - online the temporarily offline billets onto the roller table in the reverse order of the first virtual stack position sequence in sequence, arrange the re - online billets in the reverse order of the first virtual stack position sequence, and perform the steel charging in sequence.

2. The method for shortening the steel loading gap time in hot charging and direct charging according to claim 1, wherein: The billets in the same batch in S1 are billets of the same steel grade, the same specification and for implementing the same hot direct charging plan.

3. The method for shortening the steel loading gap time of hot charging and direct charging according to claim 2, characterized in that: During the time period t1 in S1, the billets of other batches in the hot direct charging plan are rolled.

4. The method for shortening the steel loading gap time in hot charging and direct charging according to claim 2 or 3, characterized in that: In S1 and S3, the total time t of the hot direct charging plan = t1 + t2.

5. The method for shortening the steel loading gap time in hot charging and direct charging according to claim 1, characterized in that: In S1, the first virtual stack position sequence is sequentially recorded as (1, 2, ……, N), in S2, the second virtual stack position sequence is sequentially recorded as (N + 1, N + 2, ……, N + M), and S4 further includes: When N ≤ M, control to select N temporarily offline billets; When N > M, control to exchange the track stack position and the billet stack position information of the temporarily offline billets.

6. The method for shortening the steel loading gap time in hot charging and direct rolling according to claim 1, characterized in that: Performing the steel charging in sequence in S4 includes: directly charging the steel according to the hot direct charging plan before the start of steel charging.

7. The method for shortening the steel loading gap time in hot charging and direct charging according to claim 1, characterized in that: In S4, the reverse order of the first virtual stack position sequence is the crane lifting order of the billets from top to bottom after temporarily offline to the warehouse stack.

8. The method for shortening the steel loading gap time in hot charging and direct charging according to claim 1, characterized in that: After S4, it further includes: controlling to make a corresponding adjustment to the steel charging order of the temporarily offline billets and the order of the hot direct charging plan.

9. The method for shortening the steel loading gap time in hot charging and direct charging according to claim 8, characterized in that: Controlling to make a corresponding adjustment to the steel charging order of the temporarily offline billets and the order of the hot direct charging plan includes: Changing the first virtual stack position sequence of the temporarily offline billets to the corresponding second virtual stack position sequence on the roller table during the gap time.

10. A system for shortening the steel loading gap time in hot charging and direct rolling, characterized in that, It includes: An offline stack position building module, which collects the information of the first stack position sequence of the billets conveyed onto the roller table within the time period t1 equal to the steel charging gap time before the start of steel charging in the same batch, and correspondingly establishes a first virtual stack position sequence identical to the first stack position sequence in sequence; A temporary offline control module, which controls to temporarily take the billets on the conveying roller table offline and stack them in sequence according to the first virtual stack position sequence; Stack position information exchange module, the stack position information exchange module collects information on the second stack position sequence of the billets within the time period t2 after the start of steel loading, and correspondingly establishes a second virtual stack position sequence that is the same as the second stack position sequence in turn; Online judgment module, the online judgment module judges whether the billet supply of the billets transported to the roller table within the time period t2 meets the requirements of hot direct charging steel loading. If not, it replaces the billet stack position information corresponding to the billets transported to the roller table within the time period t1 in the second virtual stack position sequence with the billet stack position information corresponding to the first virtual stack position sequence, reinserts the temporarily offline billets onto the roller table in turn in the reverse order of the first virtual stack position sequence, arranges the reinserted billets in the reverse order of the first virtual stack position sequence, and performs the steel loading in turn.

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