CN113828644A - Dispatching method for hot-conveying steel billets - Google Patents
Dispatching method for hot-conveying steel billets Download PDFInfo
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- CN113828644A CN113828644A CN202111112791.3A CN202111112791A CN113828644A CN 113828644 A CN113828644 A CN 113828644A CN 202111112791 A CN202111112791 A CN 202111112791A CN 113828644 A CN113828644 A CN 113828644A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 225
- 239000010959 steel Substances 0.000 title claims abstract description 225
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000005096 rolling process Methods 0.000 claims abstract description 84
- 238000004321 preservation Methods 0.000 claims abstract description 75
- 238000009628 steelmaking Methods 0.000 claims abstract description 69
- 238000012545 processing Methods 0.000 claims abstract description 13
- 238000003860 storage Methods 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims description 76
- 238000009413 insulation Methods 0.000 claims description 35
- 239000002184 metal Substances 0.000 claims description 19
- 239000011150 reinforced concrete Substances 0.000 claims description 7
- 238000010079 rubber tapping Methods 0.000 claims description 7
- 238000009423 ventilation Methods 0.000 claims description 7
- 230000002265 prevention Effects 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000012774 insulation material Substances 0.000 claims description 2
- 230000033764 rhythmic process Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005098 hot rolling Methods 0.000 abstract 2
- 230000005540 biological transmission Effects 0.000 description 17
- 230000008569 process Effects 0.000 description 17
- 239000010410 layer Substances 0.000 description 14
- 238000001816 cooling Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G35/00—Mechanical conveyors not otherwise provided for
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Abstract
A dispatching method of hot-line steel billets comprises the following steps: carrying out hot-rolling conveying on the steel-making direct-conveying equipment by a steel-making direct-conveying roller way when the hot-rolling conveying speed reaches a set threshold value; when indirect faults exist in the steelmaking direct-conveying roller way and the red conveying speed is smaller than a set threshold value, acquiring the time for predicting the indirect faults, and calculating the overstocked red conveying steel billet quantity; the transportation capacity of the flat car in the period of processing indirect fault and the storage capacity of the heat preservation pit are evaluated, and the flat car or the flat car is selected to be conveyed or transferred together with the heat preservation pit; when the steel making workshop normally produces steel billets, the steel rolling workshop has local faults or is not produced, the steel billets are transferred through the heat preservation pit, and the steel billets which are output are sent to other steel rolling workshops. The purpose of conveying the steel blanks in red is met to the greatest extent in various emergency situations by controlling the transportation rhythm of the steelmaking direct-conveying roller way and the flat car, optimizing the heat preservation effect of the flat car and combining the heat preservation effect of the heat preservation pit.
Description
Technical Field
The application relates to the field of workshop conveying, in particular to a method for dispatching a hot-rolled steel billet from a steel-making production workshop to a rolling production workshop.
Background
In a steel production plant, after a steel-making production workshop finishes casting a red billet, the billet needs to be conveyed from the steel-making production workshop to a steel-rolling production workshop for rolling, and in the process, the temperature of the red billet to be conveyed is ensured as far as possible, the rolling temperature of the red billet to be conveyed is increased, and the coal gas consumption in the rolling process is saved.
At present, the method for directly conveying the steel billets from a steel-making production workshop to a steel-rolling production workshop through a direct conveying roller way is the most common conveying method, but if the direct conveying roller way breaks down, the production progress is seriously influenced, and the high-temperature steel billets do not carry out the rolling process for a long time, so that the materials can have the defects of bending and the like, and need to be re-melted, and the great waste of resources is caused. Accordingly, steel mills typically make spare transports of steel billets in the following manner.
The steel billet can be transported in a short distance through the flat trolley, but the temperature of the steel billet is higher, the common hoisting tool can not hoist the steel billet like a common electromagnet hoisting tool, and the high-temperature steel billet can bring greater technical challenge to the operation of the flat trolley, so that the high-temperature steel billet needs to be cooled to below 500 ℃ on steel-making cooling bed equipment to hoist and load the steel billet, and the heat of the steel billet is seriously lost. And the flat car is not provided with a heat insulation cover, so that the condition of heat waste can also exist in the transportation process.
Carry out the long-range transportation through the warmth retention truck, though can effectually keep the heat of steel billet, the pressure of fund has been brought to the enterprise to the warmth retention truck no matter cost of transportation or purchasing cost, and generally in the steel plant, the use number of cars of warmth retention truck is also very limited moreover, so a lot of steel billets all are by the car flatbed, and the car that also does not be equipped with the heat preservation cover is hauled, and at this in-process, a large amount of losses also can appear in the temperature of steel billet.
Although the steel billets can be conveyed to a steel rolling production workshop in the above mode, the defects of over-low steel billet conveying temperature, heat waste, capital pressure and the like exist, the red feeding degree of the steel billets cannot be ensured, and the red feeding speed of steel making pouring cannot be matched with the steel rolling speed due to the fact that a group of red steel and a group of low-temperature steel are generated; and the steel billet can be heated in the heating furnace or forcibly rolled, the production rhythm is seriously influenced by the temperature, the forced rolling brings overload operation to equipment on a production line, and the service life of the equipment is greatly influenced.
Disclosure of Invention
In order to solve the problems in the prior art, the application aims to provide a dispatching method for red steel billets, which aims to meet the aim of red steel billet conveying to the maximum extent under various emergency conditions by controlling the transportation rhythm of a direct-conveying roller way and a flat trolley and optimizing the heat preservation effect of the flat trolley in a way that the direct-conveying roller way, the flat trolley and a heat preservation pit are mutually matched and combining the heat preservation effect of the heat preservation pit.
In order to achieve the above object, the present application provides a method for scheduling red steel billets, which specifically includes:
(1) normally producing steel billets in a steel-making production workshop and a steel-rolling production workshop, enabling the red sending speed of steel-making direct-sending equipment to reach a set threshold value, matching the steel-making speed with the steel-rolling speed, and sending the steel billets to the steel-rolling production workshop in a red way by adopting a steel-making direct-sending roller way;
(2) when indirect faults exist in the steelmaking direct-conveying roller way and the red conveying speed is smaller than a set threshold value, acquiring the time for predicting the indirect faults, and calculating the overstocked red conveying steel billet quantity according to the time for processing the indirect faults and the steel billet feeding speed; evaluating the transportation capacity of the flat car and the storage capacity of the heat preservation pit in a time period for processing indirect faults;
if the accumulated amount of the hot-conveying steel billets is less than the conveying capacity of the flat trolley, the flat trolley sends the steel billets in a hot-conveying manner;
if the accumulated amount of the hot-conveying steel billets is larger than the conveying capacity of the flat trolley but smaller than the conveying capacity of the flat trolley and the storage capacity of the heat preservation pit, the hot-conveying steel billets are transferred by the flat trolley in combination with the heat preservation pit;
if the overstocked amount of the red steel billets to be sent is larger than the transportation capacity of the flat car and the storage capacity of the heat preservation pit, the excessive steel billets can be sent to other steel rolling production workshops;
(3) when the steel making workshop normally produces steel billets, the steel rolling workshop has local faults or is not produced, the steel billets are transferred through the heat preservation pit, and the steel billets which are excessive are sent to other steel rolling workshops.
Further, the threshold value is the lowest speed value of the steel-making direct-conveying equipment for conveying the steel billet in the red mode under the condition that normal steel tapping of a steel rolling production workshop is guaranteed.
Further, the transportation capacity of the flat car is determined by the steel billet amount and the hoisting time of the full load of the flat car and the turn-back time from the steel-making production workshop to the steel-rolling production workshop.
Further, if the steel billet amount fully loaded by the flat car is not enough to support the steel billet amount required by the steel rolling production in the time period that the next batch of steel billets are sent to the steel rolling production workshop after the flat car is turned back, the second group of flat cars can be added.
Further, the interval time between the second group of flat plate trolleys and the first group of flat plate trolleys is the rolling time of the first group of flat plate trolleys for the steel billet amount sent in a red mode.
Furthermore, the flat car is provided with a first heat insulation layer, a second heat insulation layer, a heat insulation cover, a transverse rack guide rail, a ventilation channel, an axial flow fan and a temperature detector, wherein the heat insulation cover can move on the transverse rack guide rail; when the temperature detected by the temperature detector exceeds 100 ℃, the axial flow fan is controlled to be started by the PLC; the flat trolley is also provided with a fixing support, so that the steel billet can be fixed, and the flat trolley is convenient to hoist.
Furthermore, the heat-insulating cover is split, two ends of the split heat-insulating cover are closed, and the other end of the split heat-insulating cover is non-closed; the heat-preservation cover body is internally provided with a high-temperature deformation prevention structure
Furthermore, the first heat insulation layer is formed by coating a high-temperature-resistant heat insulation material on the bearing surface of the flat car and is provided with more than two stress columns, so that the steel billet is located on the stress columns, and the service life of the flat car is ensured; the second heat insulation layer is arranged on the inner side of the heat insulation cover and is spaced from the heat insulation cover by more than 3 mm.
Further, the flat car moves on a rail, and the rail is paved from the steel-making production workshop to the steel-rolling production workshop; the tail end of a rail of a steel-making production workshop and the tail end of the rail of a steel rolling production workshop are both provided with metal detectors, after a flat trolley is detected by the metal detector 1 of the steel-making production workshop, the metal detectors are fed back to a PLC system, the heat-insulating cover is automatically opened, when the flat trolley is far away, the metal detector 1 does not detect the flat trolley, and the heat-insulating cover is closed; after the metal detector 2 of the steel rolling production workshop detects the flat trolley, the heat-insulating cover is automatically opened, and when the flat trolley returns, the metal detector 2 does not detect the flat trolley, and the heat-insulating cover is closed.
Furthermore, the heat preservation pit is formed by a three-sided structure, the material of the walls on two sides is a reinforced concrete-heat preservation layer-reinforced concrete structure, and the bottom surface is a reinforced concrete-heat preservation layer-reinforced concrete-heat preservation block.
Furthermore, the steel-making production workshop and the steel rolling production workshop are hoisted by adopting a clamp type hoisting tool.
The beneficial effect of this application includes:
according to the method, the hot-conveying scheduling of the high-temperature steel billet is optimized by matching the steelmaking direct-conveying roller way, the flat trolley and the heat preservation pit, so that the rolling temperature of the high-temperature steel billet is guaranteed, the heat loss is reduced, and the purpose of conveying the steel billet in a hot-conveying manner is met to the maximum extent.
Furthermore, by optimizing the structure of the flat trolley, the temperature of the flat trolley for conveying the steel billets is increased, the temperature drop speed of the high-temperature steel billets in the transportation process or the waiting process is reduced, the difference of the cold heat values of the red steel billets is reduced, the burning loss of the steel billets in a heating furnace is reduced, the heating gas consumption and the temperature of the heating furnace in a steel rolling production workshop are more uniform, and the overload use of equipment caused by unstable steel temperature is reduced; in addition, the service life of the flat trolley is prolonged, and the stability of the red steel billet conveying is improved.
Furthermore, the heat-insulating cover of the flat car is intelligently controlled to be opened, the transportation rhythm of the flat car is controlled, the labor intensity of workers is reduced, the safety of the workers is guaranteed, and the control performance is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a front view of a flatcar loaded with a high temperature steel billet;
FIG. 2 is a top view of a flat car loaded with high temperature billets;
FIG. 3 is a side view of a flat car loaded with hot billets;
FIG. 4 is a view showing the structure of a heat-insulating pit;
FIG. 5 is a view showing the internal structure of the heat-retaining cover.
Reference numerals: 1-a steel billet; 2-a heat preservation cover; 3-a guide wheel; 4-a slide rail; 5-heat insulating material; 6-bearing surface; 7-a temperature detector; 8-a ventilation channel; 9-fixing a bracket; 10-traversing rack guide rails; 11-a transmission gear; 12-a drive motor; 13-a stand; 14-a force-bearing column; 15-a wheel; 16-rail; 17-cobblestones; 18-a wall body; 19-deformation prevention structure; 20-refractory material.
Detailed Description
Embodiments of the present application will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present application and should not be construed as limiting the scope of the present application. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially. The detection method is not particularly described, and the detection is carried out according to national standards or conventional detection methods.
The application exemplarily provides a dispatching method for red steel billet delivery, which comprises the following steps:
(1) normally producing steel billets in a steel-making production workshop and a steel-rolling production workshop, enabling the red sending speed of steel-making direct-sending equipment to reach a set threshold value, matching the steel-making speed with the steel-rolling speed, and sending the steel billets to the steel-rolling production workshop in a red way by adopting a steel-making direct-sending roller way;
the hot-conveying steel billet is a steel billet with the temperature of more than 600-950 ℃, the steel-making direct-conveying roller way directly conveys the high-temperature steel billet from a steel-making production workshop to a steel-rolling production workshop in a hot-conveying mode, and the threshold value is the lowest speed value of the hot-conveying steel billet of the steel-making direct-conveying roller way under the condition that normal steel tapping of the steel-rolling production workshop is guaranteed. If the average steel tapping speed of the bar is every 45 s/billet, the red delivery speed is kept to be more than 45 s/billet to be input into the heating furnace, so that the smooth steel tapping rhythm can be formed, and the threshold value is 45 s/billet. Therefore, when the steelmaking direct-delivery equipment reaches the set threshold value, the steel billets are red-delivered to the steel rolling production workshop by only adopting the steelmaking direct-delivery roller way, and a stable steel tapping rhythm can be formed.
If the steel-making direct-feeding roller way has indirect faults, the indirect faults have the biggest characteristic that the red blanks can be conveyed discontinuously, but the requirements of steel rolling production cannot be met, so that the red-feeding speed is smaller than a set threshold value, and the production efficiency is seriously influenced. The indirect fault is caused by that firstly, the red billets in the steelmaking production workshop are not conveyed timely, so that a large amount of high-temperature red billets are retained in the steelmaking production workshop, the heat loss is serious, and the requirement on the gas consumption is higher when the subsequent rolling work is carried out; if the high-temperature steel billet is not conveyed to a steel rolling production workshop for rolling for a long time, the high-temperature steel billet is naturally cooled, the cooling speed of the surface and the cooling speed of the interior of the red billet are different, the defects of bending and the like are caused, the steel can be re-smelted after the high-temperature steel billet is returned, and resources are greatly wasted; secondly, the number of the hot steel billets in a steel rolling production workshop is insufficient, the rolling mill has the possibility of idling, and the production progress is influenced if the rolling mill is stopped. Therefore, after the indirect fault occurs, it is important to ensure the number of the red steel billets to be sent in time.
(2) When indirect faults exist in the steelmaking direct-conveying roller way and the red conveying speed is smaller than a set threshold value, acquiring the time for predicting the indirect faults, and calculating the overstocked red conveying steel billet quantity according to the time for processing the indirect faults and the steel billet feeding speed; the transportation capacity of the flat car in the period of processing indirect fault and the storage capacity of the heat preservation pit are evaluated, and the flat car or the flat car and the heat preservation pit are selected to be conveyed or transferred in a cooperation mode;
according to the method, the flat plate trolley is arranged between the steel-making production workshop and the steel rolling production workshop, and is used for carrying out red steel billet conveying when indirect faults occur on a steel-making direct-conveying roller way as shown in figures 1-3, so that the defect of the amount of the red steel billets is overcome. And in the indirect fault handling time period, the transportation capacity of the flat car has a certain limit. Whether the steel billet is conveyed by only adopting a flat car or needs to be transferred by using a heat preservation pit can be evaluated by estimating the accumulated red steel billet conveying amount in the time for processing the indirect fault. If the time for processing the indirect fault is estimated to be 20min, the feeding speed reaching the minimum threshold value of 45 s/billet is calculated, 27 high-temperature billets are accumulated, and the flat plate trolley loads 28 billets at most at one time; and the transportation capacity of the flat car is determined by the steel billet amount and the hoisting time of the full load of the flat car and the turn-back time from the steel-making production workshop to the steel-rolling production workshop. If the flat trolley can hoist 27 high-temperature steel billets within 20min (taking a group of steel billets 7 as one hoisting amount, 1.5min is needed, 27 steel billets need 6min for hoisting, and 8min for conveying), and the steel billets can be conveyed to a steel rolling production workshop only once; for the fault which can be solved in a short time, the number of the overstocked hot-rolled steel billets in the steel-making production workshop is small, the overstocked steel billets can be conveyed to the steel-rolling production workshop only through the flat trolley, the heat loss of the high-temperature steel billets is small in a short time, and the subsequent steel-rolling production operation can be guaranteed.
If the estimated time for processing the indirect fault is 60min, 80 high-temperature billets are accumulated at the moment, 28 billets are loaded at most once by using a flat trolley, three times of conveying of the billets are needed, the flat trolley cannot turn back 3 times within 60min (the conveying time needs 12min for two times of hoisting, the conveying time and the turning-back time need 16min, and the turning-back time needs 28min for one time of conveying of the flat trolley), the 80 high-temperature billets are conveyed to a steel rolling production workshop, at the moment, the accumulated red conveying billet quantity is larger than the conveying capacity of the flat trolley but smaller than the conveying capacity of the flat trolley and the storage capacity of the heat preservation pit, at the moment, the heat preservation pit can be adopted for transferring, the rest billets are placed in the heat preservation pit, and are red conveyed by using the flat trolley and combined with the heat preservation pit for transferring the billets.
The heat preservation pit is for realizing the transfer of high temperature steel billet, and the heat preservation effect in heat preservation pit has important relation with the temperature of management red base, through setting up the heat preservation pit turnover for high temperature steel billet is at first gathered in the heat preservation pit, slows down the heat loss of steel billet through the heat accumulation and the heat preservation performance in heat preservation pit. Finally, the steel billets in the heat preservation pit can be hoisted to enter a feeding table for steel rolling in the gap time when the steel making direct-conveying equipment conveys the steel billets to a steel rolling production workshop, so that the steel billets in the heat preservation pit are digested. The storage capacity of the heat preservation pit is determined by the length, the height and other dimensions of the heat preservation pit, and the size of the heat preservation pit can be designed according to actual production requirements so as to control the storage capacity of the transfer heat preservation pit. The heat preservation pit in the application is composed of a three-side structure, the main material is reinforced concrete, the wall bodies 18 on two sides are made of reinforced concrete, a heat preservation layer and a reinforced concrete structure, the bottom surface is made of reinforced concrete, a heat preservation layer, reinforced concrete and a heat preservation block, a layer of heat preservation block which can be cobblestones 17 is further paved at the bottom of the heat preservation pit, and the structure diagram of the heat preservation pit is shown in figure 4; the thickness of the cobblestone 17 layer is preferably more than 30mm, heat insulation can be better achieved, self-adaptive adjustment can be achieved according to the weight of the steel billet on the upper portion of the cobblestone 17, and the levelness of the steel billet stacking is achieved. The heat preservation pit can be arranged in a steel-making production workshop.
The height of the heat preservation pit is preferably 10 groups of billets which can be stacked, the length of the heat preservation pit is preferably 2 groups of billets which can be stacked, and the width of the heat preservation pit is 1 group of billets which can be stacked, for example, 10 groups of billets which can be stacked, and 2 groups of billets which can be stacked; the steel-making workshop and the steel rolling workshop are hoisted by adopting the clamp-type hoisting tool, one group of steel billets are the sum of the number of the steel billets hoisted by the clamp-type hoisting tool at one time, and if the clamp-type hoisting tool can hoist 7 steel billets at one time, the 7 steel billets form one group. Therefore, the storage capacity of the heat preservation pit can reach 140 billets at the maximum. In addition, the unified clamp type hoisting tool is adopted by adjusting the size of the heat preservation pit, so that the two production workshops can be hoisted and scheduled in a unified mode, and the hoisting tool can be used for hoisting to the feeding table quickly; in addition, the clamp type hoisting tool can clamp the steel billet with the highest temperature after steel making and casting are finished, and is not influenced by high temperature.
For a complete fault or an unpredictable fault, the processing time is possibly longer, if more than 8h is needed, 640 high-temperature steel billets are overstocked in the time period (the maximum 28 steel billets are loaded by the flat car at one time, the flat car is turned back for 28min, the flat car is not interrupted within 8h, the flat car can be turned back for 17 times, the steel billets 476 are conveyed totally, 164 steel billets are remained, and the maximum 140 steel billets can be stored in the heat preservation pit), and at the moment, the overstocked red conveying steel billet amount is larger than the conveying capacity of the flat car and the storage capacity of the heat preservation pit. In a long time period, because the number of overstocked red steel billets is large, if not timely conveyed to a steel rolling production workshop for rolling, a large amount of high-temperature steel billets are exposed in the air for a long time and can be naturally cooled, and in the cooling process, not only can the heat of the steel billet 1 run off, but also defects and the like can occur, so that the excessive steel billet 1 can be conveyed to other steel rolling production workshops in a mode of adopting a heat preservation vehicle and the like.
It should be noted that, if the amount of the steel billets fully loaded at one time conveyed by the flat car is not enough to support the steel billets required by the steel rolling production in the time period of red conveying the next batch of steel billets to the steel rolling production workshop after the flat car turns back, the second group of flat cars can be added to improve the conveying capacity of the flat cars and ensure the continuous red conveying of the high-temperature steel billets without interruption. If the number of the steel billets fully loaded on the flat car is 28, one steel billet meter needs to be consumed in 45 seconds, the steel billets can be supported for 21min at most, and if the steel-making production workshop and the steel-rolling production workshop are too far away or the speed, the hoisting speed and the like of the flat car are too slow, the next batch of high-temperature steel billets cannot be timely conveyed to reach within 21min, the rolling machine has the phenomena of rolling interruption and the like, continuous steel tapping cannot be carried out, and at the moment, a second group of flat cars can be correspondingly added; and the interval time between the second group of flat plate trolleys and the first group of flat plate trolleys can be controlled to be the rolling time of the billet amount of the first group of flat plate trolleys in the hot transferring process, so that the high-temperature billets conveyed by the second group of flat plate trolleys arrive when the last hot-transferred billet of the first group of flat plate trolleys just enters the rolling mill, and the heat loss caused by the waiting time process of the high-temperature billets at the feeding platform of the rolling mill is avoided.
Furthermore, the steel billet has higher temperature, so the requirements on the heat resistance, the service life and the like of the flat car are provided.
In order to prolong the service life of the flat car and ensure the temperature of the hot-rolled steel billet, the structure of the flat car is optimized, and the following description is provided with reference to the specific structure of the flat car.
The bearing surface 6 of the flat car is coated with a high-temperature-resistant heat-insulating material 5 serving as a first heat-insulating layer to effectively isolate the high-temperature steel billet 1, and the bearing surface is provided with more than two stress columns so that the steel billet is located on the stress columns 14, thereby preventing the steel billet from contacting with the high-temperature-resistant heat-insulating material 5 due to hoisting misoperation and other reasons in the hoisting process, and the stress columns 14 bear impact and collision in the hoisting process, further prolonging the service life of the bearing surface 6 on the surface layer of the flat car, and effectively ensuring the service life of transmission equipment at the bottom of the flat car. In order to further control the heat radiation of the red billet to be transmitted to the transmission equipment at the bottom of the flat car, the two sides of the wheel 15 of the flat car are provided with the ventilation channels 8, one side of each ventilation channel 8 is provided with an axial flow fan (not shown in the figure), the bottom of each ventilation channel 8 is provided with the temperature detector 7, when the temperature of each ventilation channel 8 is detected to exceed 100 degrees through the temperature detector 7, the axial flow fans are automatically started through a PLC (programmable logic controller), the temperature control at the bottom of the flat car is completed, the damage of the heat radiation to the transmission equipment at the bottom is effectively reduced, the billet with the highest temperature after steel making and casting are finished can be conveyed in real time through measures such as the first heat insulation layer, the bottom temperature control and the like, the conveying can be realized only after the temperature of the high-temperature billet is reduced to a certain degree due to the damage of the flat car caused by the high-temperature billet 1, and the non-cause loss of heat is avoided.
In order to slow down the temperature drop speed of the red blank in the transportation process or the waiting process of the flat car, a split type heat preservation cover 2 is arranged on the flat car, two ends of the split type heat preservation cover 2 are closed, the corresponding other ends are non-closed, or the closing plates at two ends of the split type heat preservation cover 2 can be directly fixed on the flat car; meanwhile, the bottom of the heat-insulating cover is provided with a guide wheel 3, a transmission gear 11, a transmission motor 12 and a base 13, and the flat trolley is provided with a slide rail 4, a transverse rack guide rail 10 and the like; the guide wheel 3 provides power through a transmission motor 12 and can move on the slide rail 4; the transmission motor 12 is arranged on the base 13 and connected with the transmission gear 11, and the transmission gear 11 is matched with the transverse rack guide rail 10 and does not bear the finishing weight contact of the heat-insulating cover; the transmission gear 11 is arranged corresponding to the split type heat-insulation cover 2, a group of transmission gears 11 driven by a transmission motor 12 are respectively arranged at opposite angles of the split type heat-insulation cover 2 corresponding to the transverse rack guide rail 10, the main purpose is that the transmission gears 11 are stable in the transmission process and stop, the inertia is small, the heat-insulation cover can be accurately stopped in the opening and closing process only through the transmission speed or the output speed ratio of a single-roller motor, and meanwhile, the synchronism is high, and the deviation cannot occur in the opening and closing moving process of the heat-insulation cover; when the heat preservation cover moves, the transmission motor 12 and the heat preservation cover 2 move synchronously, and the heat preservation cover 2 is opened and closed. Meanwhile, a plurality of groups of high-temperature deformation-preventing structures 19 are arranged in the cover body of the heat-insulating cover 2, and the middle of the heat-insulating cover is filled with refractory materials 20, as shown in FIG. 5; the second heat insulation layer is arranged between the heat insulation cover 2 and the high-temperature billet steel, the interval between the second heat insulation layer and the heat insulation cover is more than 3mm, the heat of the high-temperature billet steel can be effectively prevented from leaking, the second heat insulation layer is arranged corresponding to the inner side of the heat insulation cover and is not in contact with the heat insulation cover, and the heat insulation cover and the second heat insulation layer are prevented from being in contact interference after thermal expansion.
Considering the operation efficiency of hoisting the flat car, in order to reduce the difficulty in the hoisting operation process, a group of fixing supports 9 are arranged on the flat car, the fixing supports 9 are installed on the flat car, the fixing supports 9 are arranged corresponding to the lengths of the steel billets, and the steel billets are fixed by the fixing supports 9 in the natural cooling process, so that the hoisting is facilitated.
Furthermore, the inner side of the top of the fixed support 9 is provided with a chamfer, so that when the steel billet is hoisted, the chamfer guides the steel billet, and the steel billet is hoisted quickly; the middle of the fixed support 9 is hollow, so that heat dissipation is facilitated, all connecting parts are fully welded, and in order to prevent the fixed support 9 from deforming due to high-temperature baking, the service life of the fixed support 9 is prolonged; in addition, a rib plate is additionally welded in the middle of the fixed support 9, so that the overall strength of the fixed support 9 is improved; the material of the fixed bracket 9 can be steel plate with the thickness of more than 20mm, I-shaped steel, channel steel and the like, and can also be directly made of waste steel billets.
In order to reduce the labor intensity of operators and improve the control performance, and respond to the opening and closing operation of the heat-insulating cover more quickly, the tail ends of two ends of a rail 16 for guiding a flat car are provided with metal detectors, specifically, a metal detector 1 is arranged at the tail end of the rail 16 of a steel-making workshop, and a metal detector 2 is arranged at the tail end of the rail 16 of a steel-rolling workshop; the empty flat trolley is driven into a steel-making production workshop, the metal detector 1 detects the trolley, signals are fed back to a PLC system through the detector, a driving device on the heat-insulating cover 2 is automatically controlled to operate, the heat-insulating cover 2 is automatically opened, the flat trolley is driven to the steel-making production workshop after the flat trolley is filled with high-temperature steel billets, the flat trolley is not detected by the metal detector 1, the driving device of the heat-insulating cover 2 operates, and the heat-insulating cover 2 is closed; after the flat car drives into the tail end of a rail 16 of a steel rolling production workshop, the metal detector 2 detects the car, signals are fed back to the PLC system through the detector, a driving device on the heat-insulating cover 2 is automatically controlled to operate, the heat-insulating cover 2 is automatically opened, a crane can hoist steel billets on the flat car, when the flat car returns, the metal detector 2 does not detect the flat car, and the heat-insulating cover 2 is closed.
Through the improvement on the structure of the flat trolley, the temperature drop speed of the steel billet is greatly reduced. Through the design of the heat-insulating cover, when the temperature of the steel billet is within the range of 700-800 ℃, the steel billet loses 5 degrees per minute in the hoisting process and the transportation process on average; after the heat preservation pit is reserved, the temperature is lost by 5 degrees every 10 minutes averagely, and the technical purpose of red billet conveying is guaranteed to the maximum extent.
(3) When the steel making workshop normally produces steel billets, the steel rolling workshop has local faults or is not produced, the steel billets are transferred through the heat preservation pit, and the steel billets which are excessive are sent to other steel rolling workshops.
When the steel-making workshop normally produces, if the steel-making workshop stops producing because of other reasons, the steel billet can not be digested, the high-temperature steel billet can be transported to the heat-preserving pit through the flat plate small handle, after the heat-preserving pit is filled with the steel billet, the rest steel billet produced in the steel-making workshop is transported to other steel-making workshops, and after the steel-making workshop produces again, the steel billet in the heat-preserving pit is digested; if the steel rolling workshop has local fault problem and is not matched with the red billet produced by steel making, the steel can be transferred through the heat preservation pit; after the information of the problem processing time of the steel rolling workshop can be judged by field management personnel, other redundant high-temperature steel billets are sent to other steel rolling workshops according to the processing time and the number of the steel billets in the heat preservation pit.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application are clearly and completely described above with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the above detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when in use, and are used only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In the present application, all the embodiments, implementations, and features of the present application may be combined with each other without contradiction or conflict. In the present application, conventional equipment, devices, components, etc. are either commercially available or self-made in accordance with the present disclosure. In this application, some conventional operations and devices, apparatuses, components are omitted or only briefly described in order to highlight the importance of the present application.
The foregoing is merely exemplary of the present application and is not intended to limit the present application, which may be modified or varied by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A dispatching method of hot-dip steel billets is characterized by comprising the following steps:
(1) normally producing steel billets in a steel-making production workshop and a steel-rolling production workshop, enabling the red sending speed of steel-making direct-sending equipment to reach a set threshold value, matching the steel-making speed with the steel-rolling speed, and sending the steel billets to the steel-rolling production workshop in a red way by adopting a steel-making direct-sending roller way;
(2) when indirect faults exist in the steelmaking direct-conveying roller way and the red conveying speed is smaller than a set threshold value, acquiring the time for predicting the indirect faults, and calculating the overstocked red conveying steel billet quantity according to the time for processing the indirect faults and the steel billet feeding speed; evaluating the transportation capacity of the flat car and the storage capacity of the heat preservation pit in a time period for processing indirect faults;
if the accumulated amount of the hot-conveying steel billets is less than the conveying capacity of the flat trolley, the flat trolley sends the steel billets in a hot-conveying manner;
if the accumulated amount of the hot-conveying steel billets is larger than the conveying capacity of the flat trolley but smaller than the conveying capacity of the flat trolley and the storage capacity of the heat preservation pit, the hot-conveying steel billets are transferred by the flat trolley in combination with the heat preservation pit;
if the overstocked amount of the red steel billets to be sent is larger than the transportation capacity of the flat car and the storage capacity of the heat preservation pit, the excessive steel billets can be sent to other steel rolling production workshops;
(3) when the steel making workshop normally produces steel billets, the steel rolling workshop has local faults or is not produced, the steel billets are transferred through the heat preservation pit, and the steel billets which are excessive are sent to other steel rolling workshops.
2. The dispatching method of claim 1, wherein the threshold is a lowest speed value of the steelmaking direct-feed equipment for red-feeding billets under the condition that normal tapping of a steel rolling production workshop is guaranteed.
3. The dispatching method of claim 1, wherein the transportation capacity of the flat car is determined by the amount of steel billets loaded and the hoisting time of the flat car and the turnaround time from the steelmaking plant to the rolling plant.
4. The dispatching method of claim 3, wherein the second group of plate trolleys is increased if the plate trolley is fully loaded with a steel billet quantity which is not enough to support the steel billet quantity required by the steel rolling production in the time period of red sending the next batch of steel billets to the steel rolling production workshop after the plate trolley is turned back;
the interval time between the second group of flat plate trolleys and the first group of flat plate trolleys is the rolling time of the first group of flat plate trolleys for the steel billet amount sent in a red mode.
5. The scheduling method of claim 1,
the flat trolley is provided with a first heat insulation layer, a second heat insulation layer, a heat insulation cover, a transverse rack guide rail, a guide wheel, a slide rail, a ventilation channel, an axial flow fan and a temperature detector; the flat trolley is also provided with a fixing support, so that the steel billet can be fixed, and the flat trolley is convenient to hoist.
6. The scheduling method of claim 5, wherein the heat-preserving cover is split, two ends of the split heat-preserving cover are closed, and the corresponding other end is non-closed; the heat-preservation cover body is internally provided with a high-temperature deformation prevention structure.
7. The dispatching method according to claim 5, wherein the first heat insulation layer is formed by coating a high-temperature-resistant heat insulation material on the bearing surface of the flat car and is provided with more than two stress columns and fixing supports;
the second heat insulation layer is arranged on the inner side of the heat insulation cover and is spaced from the heat insulation cover by more than 3 mm.
8. The dispatching method of claim 5, wherein the flat car moves on rails, the rails being laid from the steelmaking plant to the rolling plant; the tail end of a rail in a steel-making production workshop and the tail end of the rail in a steel rolling production workshop are both provided with a metal detector; after the metal detector 1 of the steelmaking workshop detects the flat trolley, the metal detector feeds back the flat trolley to the PLC system, the heat-insulating cover is automatically opened, and when the flat trolley is far away, the metal detector 1 does not detect the flat trolley, and the heat-insulating cover is closed; after the metal detector 2 of the steel rolling production workshop detects the flat trolley, the heat-insulating cover is automatically opened, and when the flat trolley returns, the metal detector 2 does not detect the flat trolley, and the heat-insulating cover is closed.
9. The scheduling method of claim 1 wherein the insulation pit is constructed in a three-sided structure, the two side walls are reinforced concrete-insulation layer-reinforced concrete structure, and the bottom surface is reinforced concrete-insulation layer-reinforced concrete-insulation block.
10. The dispatching method of claim 1, wherein the steelmaking workshop and the rolling workshop are hoisted by using a unified clamp-type hoisting tool.
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| CN117920985A (en) * | 2024-03-20 | 2024-04-26 | 成都新航工业科技股份有限公司 | Molten liquid transferring method and device for casting gypsum mold investment pattern |
| CN117920985B (en) * | 2024-03-20 | 2024-06-11 | 成都新航工业科技股份有限公司 | Molten liquid transferring method and device for casting gypsum mold investment pattern |
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| CN113828644B (en) | 2023-12-05 |
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