CN113828644B - Scheduling method for red-fed billets - Google Patents
Scheduling method for red-fed billets Download PDFInfo
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- CN113828644B CN113828644B CN202111112791.3A CN202111112791A CN113828644B CN 113828644 B CN113828644 B CN 113828644B CN 202111112791 A CN202111112791 A CN 202111112791A CN 113828644 B CN113828644 B CN 113828644B
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 163
- 239000010959 steel Substances 0.000 claims abstract description 163
- 238000004321 preservation Methods 0.000 claims abstract description 111
- 238000005096 rolling process Methods 0.000 claims abstract description 92
- 238000004519 manufacturing process Methods 0.000 claims abstract description 70
- 238000009628 steelmaking Methods 0.000 claims abstract description 60
- 238000003860 storage Methods 0.000 claims abstract description 13
- 238000009413 insulation Methods 0.000 claims description 25
- 239000002184 metal Substances 0.000 claims description 17
- 238000010079 rubber tapping Methods 0.000 claims description 7
- 238000012546 transfer Methods 0.000 claims description 7
- 238000009423 ventilation Methods 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 5
- 239000012774 insulation material Substances 0.000 claims description 4
- 239000011150 reinforced concrete Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 230000033764 rhythmic process Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 description 18
- 230000008569 process Effects 0.000 description 15
- 239000010410 layer Substances 0.000 description 12
- 238000010438 heat treatment Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 5
- 230000007547 defect Effects 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
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
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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)
- Metal Rolling (AREA)
Abstract
A dispatching method for red-fed billets comprises the following steps: the red conveying speed of the steelmaking direct conveying equipment reaches a set threshold value, and the steelmaking direct conveying roller way red conveying billets; when the indirect fault exists 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 fault, and calculating the backlog of the red-conveying steel billets; the transportation capacity of the flat trolley in the period of indirect fault treatment and the storage capacity of the heat preservation pit are evaluated, and the flat trolley or the flat trolley and the heat preservation pit are selected to be transported or transferred together; when the steel-making production workshop normally produces billets, the steel rolling production workshop has local faults or is not produced, and the billets are transferred to other steel rolling production workshops through the heat preservation pits. The steel-making direct-feeding roller way, the transportation rhythm of the flat trolley and the heat preservation effect of the flat trolley are controlled, and the heat preservation effect of the heat preservation pit is combined, so that the purpose of red-feeding billets in various emergency situations is met to the greatest extent.
Description
Technical Field
The application relates to the field of workshop conveying, in particular to a red-feed billet scheduling method from a steelmaking workshop to a rolling workshop.
Background
After the steel production plant finishes red billet casting, the steel billets are conveyed from the steel production plant to the steel rolling production plant for rolling, and in the process, the temperature of the red-fed steel billets must be ensured as much as possible, the rolling temperature of the red-fed steel billets is increased, and the gas consumption in the rolling process is reduced.
At present, the direct conveying of billets from a steelmaking workshop to a steel rolling workshop through a direct conveying roller way is the most commonly used conveying mode, but if the direct conveying roller way fails, the production progress is seriously affected, the high-temperature billets are not rolled for a long time, the defects of bending and the like of materials can occur, and the materials need to be returned to the furnace again, so that the great waste of resources is caused. Therefore, the steelworks generally carry out spare transportation of billets in the following manner.
Through the transportation of flat-bed trolley closely, but steel billet temperature is higher, and ordinary lifting means like the electro-magnet lifting means of using commonly used can't hoist and mount, and high temperature steel billet still can bring great technical challenge to the operation of flat-bed trolley, consequently need cool off the high temperature steel billet to below 500 ℃ on steelmaking cooling bed equipment just can hoist and mount, the loading, has seriously lost the heat of steel billet. And the flat car is not provided with a heat preservation cover, so that the condition of heat waste can be also existed in the transportation process.
The heat preservation vehicle is used for carrying out remote transportation, although the heat of the steel billets can be effectively maintained, the heat preservation vehicle brings fund pressure to enterprises no matter the transportation cost or the purchasing cost, and the number of the heat preservation vehicles is very limited in a steel plant generally, so that a plurality of steel billets are pulled by the automobile flat car, namely the automobile without the heat preservation cover, and a large amount of loss can occur to the temperature of the steel billets in the process.
In the mode, although steel billets can be conveyed to a steel rolling production workshop, the defects of excessively low steel billet conveying temperature, heat waste, fund pressure and the like exist, the red conveying progress of the steel billets cannot be ensured, the condition that a group of red steels and a group of low-temperature steels occur, and the red conveying speed of steel making pouring cannot be matched with the steel rolling speed; and the gas consumption for heating the heating furnace in the steel rolling workshop can cause great difficulty, or the billet is heated in the heating furnace, or forced rolling is carried out, the temperature is seriously influenced on the production rhythm, 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-feeding billets, which is characterized in that the transportation rhythm of a direct-feeding roller way, a flat-plate trolley and a heat preservation pit are controlled and the heat preservation effect of the flat-plate trolley is optimized by mutually matching the direct-feeding roller way, the flat-plate trolley and the heat preservation pit, so that the purpose of meeting the red-feeding billets to the greatest extent under various emergency conditions is achieved.
The application provides a dispatching method for red-feeding billets, which specifically comprises the following steps:
(1) The steel making production workshop and the steel rolling production workshop normally produce billets, the red conveying speed of steel making direct conveying equipment reaches a set threshold value, the steel making speed is matched with the steel rolling speed, and a steel making direct conveying roller way is adopted to red convey billets to the steel rolling production workshop;
(2) When the indirect fault exists in the steelmaking direct-conveying roller way, and the red conveying speed is smaller than a set threshold value, obtaining the time for predicting the indirect fault, and calculating the backlog red conveying billet quantity according to the time for processing the indirect fault and the billet feeding speed; evaluating the transportation capacity of the flat trolley and the storage capacity of the heat preservation pit in the period of handling the indirect fault;
if the quantity of the backlogged red-fed billets is smaller than the transport capacity of the flat trolley, red-fed billets are fed by the flat trolley;
if the accumulated red steel billet quantity is larger than the transportation capacity of the flat trolley but smaller than the transportation capacity of the flat trolley and the storage capacity of the heat preservation pit, red-feeding by the flat trolley and carrying out billet transfer by combining the heat preservation pit;
if the quantity of the backlogged red steel billets is larger than the transportation capacity of the flat trolley 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 production workshop normally produces billets, the steel rolling production workshop has local faults or does not produce billets, the billets are transferred through the heat preservation pit, and the excessive billets are sent to other steel rolling production workshops.
Further, the threshold value is the lowest speed value of the steel making direct-feeding equipment for red-feeding the steel billet under the condition of ensuring normal tapping of a steel rolling production workshop.
Further, the transport capacity of the pallet truck is determined by the amount of steel billets and the hoisting time of the pallet truck, and the turn-back time from the steelmaking plant to the steel rolling plant.
Further, if the number of billets fully loaded by the pallet truck is insufficient to support the number of billets required for steel rolling production in a period of time when the pallet truck returns to send the next batch of billets to the steel rolling production plant, the pallet truck of the second group can be increased.
Further, the interval time between the second group of flat trolleys and the first group of flat trolleys is the rolling time of the first group of flat trolleys for red billet feeding.
Further, 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 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 PLC controls the axial flow fan to be started; and the flat trolley is also provided with a fixed bracket which can fix the billet and is convenient for hoisting.
Further, the heat preservation cover is split, two ends of the split heat preservation cover are closed, and the corresponding other ends of the split heat preservation cover are non-closed; the heat preservation cover body is internally provided with a high-temperature deformation preventing structure
Further, the first heat insulation layer is formed by coating a high-temperature-resistant heat insulation material on the bearing surface of the flat trolley and is provided with more than two stress columns, so that a steel billet is located on the stress columns, and the service life of the flat trolley is ensured; the second heat insulation layer is arranged on the inner side of the heat insulation cover and is spaced more than 3mm from the heat insulation cover.
Further, the slab trolley moves on a rail, and the rail is paved from the steelmaking workshop to the steel rolling workshop; the method comprises the steps that metal detectors are arranged at the extreme ends of rails in a steelmaking workshop and the extreme ends of rails in a steel rolling workshop, after a flat trolley is detected by a metal detector 1 in the steelmaking workshop, the flat trolley is fed back to a PLC system, a heat preservation cover is automatically opened, when the flat trolley is far away, the flat trolley is not detected by the metal detector 1, and the heat preservation cover is closed; after the metal detector 2 of the steel rolling production workshop detects the flat trolley, the heat preservation cover is automatically opened, and when the flat trolley returns, the metal detector 2 does not detect the flat trolley, and the heat preservation cover is closed.
Further, the heat preservation pit is composed of a three-face structure, two side walls are made of reinforced concrete-heat preservation layer-reinforced concrete structure, and the bottom surface is made of reinforced concrete-heat preservation layer-reinforced concrete-heat preservation block.
Further, both the steelmaking workshop and the steel rolling workshop are hoisted by clamp type hoisting tools.
The beneficial effects of the application include:
according to the application, the red-feeding scheduling of the high-temperature steel billets is optimized through the cooperation of the steel-making direct-feeding roller table, the flat trolley and the heat preservation pit, so that the rolling temperature of the high-temperature steel billets is ensured, the heat loss is reduced, and the purpose of red-feeding the steel billets is met to the greatest extent.
Further, through optimizing the structure of the flat trolley, the temperature of the flat trolley for conveying the steel billets is improved, the temperature drop speed of the high-temperature steel billets in the transportation process or the waiting process is slowed down, the difference between cold values and hot values of the red-conveyed steel billets is reduced, the burning loss of the steel billets in a heating furnace can be 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-fed steel billet is improved.
Further, the heat preservation cover of the flat trolley is intelligently controlled to be opened, the transportation rhythm of the flat trolley is controlled, the labor intensity of workers is reduced, the safety of the workers is ensured, 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 needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a main view of a slab ingot loaded with a high temperature billet;
FIG. 2 is a top view of the pallet truck loaded with a high temperature billet;
FIG. 3 is a side view of a pallet truck loaded with a high temperature billet;
FIG. 4 is a diagram of a pit structure;
fig. 5 is a view showing the internal structure of the heat-insulating cover.
Reference numerals: 1-billet steel; 2-a heat preservation cover; 3-guide wheels; 4-sliding rails; 5-insulating material; 6-bearing surface; 7-a temperature detector; 8-ventilation channels; 9-fixing a bracket; 10-traversing rack guide rails; 11-a transmission gear; 12-a transmission motor; 13-a stand; 14-a stress column; 15-wheels; 16-track; 17-cobble; 18-a wall body; 19-a deformation preventing structure; 20-refractory material.
Detailed Description
Embodiments of the present application will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only for illustrating the present application and should not be construed as limiting the scope of the present application. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention. The detection method used is not particularly specified, and is carried out according to national standards or conventional detection methods.
The application provides a scheduling method for red-fed billets, which comprises the following steps:
(1) The steel making production workshop and the steel rolling production workshop normally produce billets, the red conveying speed of steel making direct conveying equipment reaches a set threshold value, the steel making speed is matched with the steel rolling speed, and a steel making direct conveying roller way is adopted to red convey billets to the steel rolling production workshop;
the steel billet is directly red to a steel rolling production workshop from the steel rolling production workshop by the steel-making direct-feeding roller way, and the threshold value is the lowest speed value of the steel billet red to be fed by the steel-making direct-feeding roller way under the condition of ensuring normal steel tapping of the steel rolling production workshop. If the steel bar tapping speed is equal to 45 s/piece, the red-feeding speed is also kept to be higher than 45 s/piece, and the steel billet is input into the heating furnace, so that a smooth tapping rhythm can be formed, and the threshold value is 45 s/piece. Therefore, when the steelmaking direct-feeding equipment reaches a set threshold value, the steel billet is red-fed to the steel rolling production workshop only by adopting the steelmaking direct-feeding roller way, and a stable tapping rhythm can be formed.
If the steelmaking direct-feeding roller way has an indirect fault, the indirect fault is characterized in that red blanks can be intermittently fed, but the production requirement of steel rolling cannot be met, so that the red feeding speed is smaller than a set threshold value, and the production efficiency can be seriously influenced. The indirect fault firstly causes that red billets in a steelmaking workshop are not transported timely, a large amount of high Wen Gongpi is retained in the steelmaking workshop, the heat loss is serious, the rolling work is carried out subsequently, and the requirement on the gas consumption is higher; if the high-temperature steel billet is not conveyed to a steel rolling production workshop for rolling for a long time, the defects of bending and the like are caused by different cooling speeds of the surface and the interior of the red billet due to natural cooling of the high-temperature steel billet, and the steel is possibly returned to the furnace for steel making again, so that resources are greatly wasted; secondly, the number of red-fed billets in a steel rolling production workshop is possibly insufficient, the rolling mill is idle, and if the rolling mill is stopped, the production progress is affected. Therefore, after an indirect fault occurs, it is important to ensure the number of the red-fed billets in time.
(2) When the indirect fault exists in the steelmaking direct-conveying roller way, and the red conveying speed is smaller than a set threshold value, obtaining the time for predicting the indirect fault, and calculating the backlog red conveying billet quantity according to the time for processing the indirect fault and the billet feeding speed; the transportation capacity of the flat trolley in the period of indirect fault treatment and the storage capacity of the heat preservation pit are evaluated, and the flat trolley or the flat trolley and the heat preservation pit are selected to cooperate for transportation or transfer;
the application sets the flat trolley between the steelmaking workshop and the steel rolling workshop, as shown in figures 1-3, and is used for carrying out red billet feeding when the indirect fault occurs in the steelmaking direct-feeding roller way, so as to make up the defect of the quantity of the red billet feeding. And in the indirect fault treatment time period, the transportation capacity of the flat trolley is limited to a certain extent. Whether the transfer is carried out by adopting the flat trolley or the transfer is carried out by using the heat preservation pit can be estimated by the amount of the red-fed steel billet backlogged in the time of processing the indirect fault. If the time for predicting the indirect fault is 20min, calculating according to the feeding speed reaching the lowest threshold value of 45 s/piece, backlog 27 high-temperature billets, and loading 28 billets at most at one time by a flat trolley; the transportation capacity of the flat trolley is determined by the full-load billet quantity and the hoisting time of the flat trolley and the turn-back time from the steelmaking workshop to the steel rolling workshop. If the flat trolley is used for hoisting 27 high-temperature billets within 20min (a group of billets only needs to be hoisted once for 1.5min, hoisting of 27 billets needs to be performed for 6min and conveying needs to be performed for 8 min), and the high-temperature billets can be hoisted and conveyed to a steel rolling production workshop only once, the flat trolley can be used for red conveying of billets; for faults which can be solved in a short time, the number of the backlogged red-fed billets in the steelmaking workshop is small, the backlogged billets can be conveyed to the steel rolling workshop only through the flat trolley, the heat loss of the high-temperature billets in the short time is small, and the subsequent steel rolling production operation can be ensured.
However, if the time for predicting the indirect fault is 60min, 80 high-temperature billets are backlogged at the moment, 28 billets are loaded at most by a flat trolley at one time, three billets need to be conveyed, the flat trolley cannot be folded back for 3 times within 60min (12 min is required for conveying one time and 16min is required for conveying and folding back, 28min is required for folding back the flat trolley), 80 high-temperature billets are conveyed to a steel rolling production workshop, at the moment, the backlogged red billet conveying amount 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 used for transferring, the rest billets are placed in the heat preservation pit, and the flat trolley is red-conveyed by combining with the heat preservation pit for transferring.
The heat preservation pit is in order to realize the transfer of high temperature steel billet, and the heat preservation effect of heat preservation pit has important relation with the temperature of management red base, through setting up heat preservation pit turnover for high temperature steel billet gathers at first in the heat preservation pit, slows down the heat loss of steel billet through heat gathering and heat preservation performance of heat preservation pit. And finally, hoisting the steel billet in the heat preservation pit in the gap time from steel making direct-feeding equipment to steel rolling production workshop to enter a steel rolling feeding table, so as to digest the steel billet in the heat preservation pit. 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 design of the size of the heat preservation pit can be carried out according to the actual production requirement so as to control the storage capacity of the transfer heat preservation pit. The heat preservation pit is composed of a three-face structure, the main material is reinforced concrete, the two side walls 18 are of reinforced concrete-heat preservation layer-reinforced concrete structure, the bottom surface is reinforced concrete-heat preservation layer-reinforced concrete-heat preservation block, a layer of heat preservation block which can be cobble 17 is 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, so that the cobblestone 17 layer can be well insulated, and the levelness of stacking of the cobblestones can be realized according to the self-adaptive adjustment of the weight of the steel billets on the upper part of the cobblestone 17. The heat preservation pit can be arranged in a steelmaking workshop.
The height of the heat preservation pit is preferably 10 groups of steel billets and more, the length is preferably 2 groups of steel billets and more can be placed, the width is 1 group of steel billets and more, for example, 10 groups of steel billets can be stacked, and the length of 2 groups of steel billets can be selected; the steel-making production workshop and the steel-rolling production workshop are both hoisted by adopting clamp type hoisting tools, one group of steel billets is the sum of the number of the steel billets hoisted by the clamp type hoisting tools at one time, for example, 7 steel billets can be hoisted by the clamp type hoisting tools at one time, and the 7 steel billets are one group. Therefore, the storage capacity of the heat preservation pit can reach 140 billets at maximum. In addition, a unified clamp type lifting tool is adopted by adjusting the size of the heat preservation pit, so that two production workshops can be lifted and scheduled uniformly, and a lifting appliance can be lifted to a feeding table rapidly; in addition, the clamp type hoisting tool can clamp the steel billet with the highest temperature after the steel making casting is finished, and is not influenced by the high temperature.
For complete faults or unpredictable faults, the processing time can be longer, if more than 8 hours are needed, 640 high-temperature billets are backlogged in the period of time, (28 billets are loaded at most once by the flat trolley, the flat trolley is turned back for 28min, the flat trolley is uninterrupted in 8 hours, 17 times at most can be turned back, 476 billets are conveyed totally, 164 billets remain, and 140 billets can be stored in a heat preservation pit at most), and at the moment, the backlogged red billet conveying quantity is larger than the transportation capacity of the flat trolley and the storage capacity of the heat preservation pit. In a long period of time, because the number of the accumulated red-fed billets is large, if the accumulated red-fed billets are not timely conveyed to a steel rolling production workshop for rolling, a large number of high-temperature billets are exposed to the air for a long time and can be naturally cooled, and in the cooling process, heat of the billets 1 can be lost, defects and the like can occur, so that the excessive billets 1 can be conveyed to other steel rolling production workshops in a heat preservation vehicle and other modes.
It should be noted that if the quantity of the fully loaded billets delivered by the flat trolley at one time is insufficient to support the quantity of billets required for steel rolling production in the period that the next batch of billets arrive at the steel rolling production workshop after the flat trolley is turned back, the second group of flat trolleys can be added to improve the transportation capability of the flat trolleys, and the continuous red delivery of high-temperature billets can be ensured without interruption. If the number of the fully loaded billets of the plate trolley is 28, one billet gauge needs to be consumed in 45 seconds, and at most, only 21 minutes can be supported, and if the high-temperature billets of the next batch cannot be timely conveyed in 21 minutes due to the fact that the distance between a steelmaking production workshop and a steel rolling production workshop is too long or the speed, the hoisting speed and the like of the plate trolley are too slow, the phenomenon that rolling is interrupted and continuous tapping cannot be carried out exists in a rolling machine, and at the moment, a second group of plate trolley can be correspondingly increased; and the interval time between the second group of flat plate trolleys and the first group of flat plate trolleys is controlled to be the rolling time of the first group of flat plate trolleys for red-feeding the steel billets, so that when the last red-feeding steel billet of the first group of flat plate trolleys just enters the rolling mill, the high-temperature steel billets conveyed by the second group of flat plate trolleys reach, and the waiting time process of the high-temperature steel billets at the feeding table of the rolling mill is avoided, so that heat loss is caused.
Further, since the billet temperature is high, requirements for heat resistance, service life, and the like of the flatbed trolley are raised.
In order to improve the service life of the flat trolley and ensure the temperature of the red-fed billets, the structure of the flat trolley is optimized, and the specific structure of the flat trolley is described below.
The bearing surface 6 of the flat trolley is coated with the high-temperature-resistant heat insulation material 5 as a first heat insulation layer, so that the high-temperature steel billet 1 is effectively isolated, and more than two stress columns are arranged on the bearing surface, so that the steel billet is located on the stress column 14, the steel billet can be prevented from being contacted with the high-temperature-resistant heat insulation material 5 due to the reasons of lifting misoperation and the like in the lifting process, the stress column 14 bears the impact and collision in the lifting process, the service life of the bearing surface 6 of the surface layer of the flat trolley is further prolonged, and meanwhile, the service life of transmission equipment at the bottom of the flat trolley is also effectively ensured. In order to further control heat radiation of red blanks to be conducted to bottom transmission equipment of the flat trolley, ventilation channels 8 are arranged on two sides of wheels 15 of the flat trolley, axial fans (not shown in the drawing) are arranged on one sides of the ventilation channels 8, temperature detectors 7 are arranged at the bottoms of the ventilation channels 8, when the temperature of the ventilation channels 8 exceeds 100 degrees through the temperature detectors 7, the axial fans are automatically started through a PLC, temperature control of the bottom of the flat trolley is completed, damage of the heat radiation to the bottom transmission equipment is effectively reduced, and through measures such as a first heat insulation layer and bottom temperature control, steel blanks with the highest temperature after steel making casting are carried in real time, conveying can be achieved without needing to be reduced to a certain degree after the temperature of the steel blanks with the high temperature is reduced to a certain degree due to damage of the flat trolley caused by the steel blanks with the high temperature 1, and the heat non-failure loss 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 trolley, the flat trolley is provided with a split type heat preservation cover 2, two ends of the split type heat preservation cover 2 are closed, the other corresponding ends are non-closed, or the sealing plates at the two ends of the split type heat preservation cover 2 can be directly fixed on the flat trolley; meanwhile, a guide wheel 3, a transmission gear 11, a transmission motor 12 and a machine base 13 are arranged at the bottom of the heat preservation cover, and a sliding rail 4, a transverse rack guide rail 10 and the like are arranged on the flat trolley; the guide wheel 3 is powered by a transmission motor 12 and can move on the sliding rail 4; the transmission motor 12 is arranged on the base 13 and is connected with the transmission gear 11, and the transmission gear 11 is matched with the transverse moving rack guide rail 10 and does not bear the contact of the finishing weight of the heat preservation cover; the transmission gear 11 is arranged corresponding to the split type heat preservation cover 2, a group of transmission gears 11 driven by the transmission motor 12 are respectively arranged at opposite angles of the split type heat preservation cover 2 corresponding to the transverse moving rack guide rail 10, the main purpose is that the transmission gears 11 are relatively stable in transmission and stop, the inertia is relatively small, the accurate stop position of the heat preservation cover in the opening and closing process can be realized only through the transmission speed or the output speed ratio of the single-roller motor, meanwhile, the synchronism is high, and the deviation in the process of opening and closing the heat preservation cover can not occur; when the heat preservation cover moves, the transmission motor 12 and the heat preservation cover 2 synchronously move, so that the heat preservation cover 2 is opened and closed. Meanwhile, a plurality of groups of high Wen Fangbian-shaped structures 19 are arranged in the cover body of the heat preservation cover 2, and the middle of the heat preservation 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 steel billet, is spaced more than 3mm from the heat insulation cover, can more effectively prevent heat of the high-temperature steel billet from leaking, is arranged on the inner side of the heat insulation cover corresponding to the second heat insulation layer, is not in contact with the heat insulation cover, and prevents the heat insulation cover from being in contact interference with the second heat insulation layer after heat expansion.
Considering the operating efficiency of flat-plate trolley hoisting, in order to reduce the difficulty of hoisting operation in-process be equipped with a set of fixed bolster 9 on the flat-plate trolley, fixed bolster 9 installs on the flat-plate trolley, fixed bolster 9 corresponds billet length setting, is fixed by fixed bolster 9 at billet natural cooling's in-process, is convenient for hoist and mount.
Furthermore, the inner side of the top of the fixed bracket 9 is provided with a chamfer, so that the chamfer is convenient for guiding the billet when the billet is hoisted, and the billet is convenient to hoist rapidly; the middle of the fixed bracket 9 is hollow, so that heat dissipation is facilitated, all connecting parts are fully welded, and the service life of the fixed bracket 9 is prolonged in order to prevent the fixed bracket 9 from being deformed due to high-temperature baking; in addition, a rib plate is welded in the middle of the fixed support 9, so that the overall strength of the fixed support 9 is improved; the fixing bracket 9 can be made of steel plates with the thickness of more than 20mm, I-steel, channel steel and other materials, or can be made of waste steel billets directly.
In order to reduce the labor intensity of operators and improve the control performance, the opening and closing operation of the heat preservation cover is responded more quickly, and metal detectors are arranged at the tail ends of the two ends of the rail 16 for guiding the flat trolley, specifically, a metal detector 1 is arranged at the tail end of the rail 16 of the steel-making workshop, and a metal detector 2 is arranged at the tail end of the rail 16 of the steel rolling workshop; the empty flat trolley enters a steelmaking workshop, a metal detector 1 detects the trolley, a signal is fed back to a PLC system through the detector, a driving device on a heat preservation cover 2 is automatically controlled to operate, the heat preservation cover 2 is automatically opened, after the flat trolley is filled with high-temperature billets, the flat trolley enters a steel rolling workshop, the metal detector 1 does not detect the flat trolley, a driving device of the heat preservation cover 2 operates, and the heat preservation cover 2 is closed; after the flat plate trolley enters the tail end of the rail 16 of the steel rolling production workshop, the metal detector 2 detects the trolley, signals are fed back to the PLC system through the detector, the driving device on the heat preservation cover 2 is automatically controlled to operate, the heat preservation cover 2 is automatically opened, the traveling crane can hoist steel billets on the flat plate trolley, when the flat plate trolley returns, the metal detector 2 does not detect the flat plate trolley, and the heat preservation cover 2 is closed.
Through the improvement of the structure of the flat trolley, the temperature drop speed of the steel billet is greatly reduced. Through the design of the heat preservation cover, when the temperature of the steel billet is between 700 and 800 ℃, the steel billet is lost by 5 degrees in each minute in the hoisting process and the transportation process; after the heat preservation pit, the average loss temperature is 5 degrees every 10 minutes, so that the technical purpose of red billet feeding is ensured to the greatest extent.
(3) When the steel-making production workshop normally produces billets, the steel rolling production workshop has local faults or does not produce billets, the billets are transferred through the heat preservation pit, and the excessive billets are sent to other steel rolling production workshops.
When the steel rolling workshop is in normal production, if the steel rolling workshop stops production for other reasons, the steel billets cannot be digested, the steel billets can be transported to the heat preservation pit through the flat small handle bars, after the heat preservation pit is full, the rest steel billets produced in steel making are transported to other steel rolling workshops, and after the steel rolling workshops are in production again, the steel billets in the heat preservation pit are digested; if the steel rolling workshop has a local fault problem and is not matched with the red billet produced by steelmaking, the steel rolling workshop can also pass through a heat preservation pit for transferring; after the on-site manager can judge the problem handling time of the steel rolling workshop, other redundant high-temperature billets are sent to other steel rolling workshops according to the handling time and the number of billets in the heat preservation pit.
In order to make the purposes, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application are clearly and completely described above in conjunction with the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are some, but not all, embodiments of the application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Accordingly, the above detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or those that are conventionally put in use of the product of the application, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In the present application, all the embodiments, implementations and features of the 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 homemade in accordance with the present disclosure. In the present application, some conventional operations and apparatuses, devices, components are omitted or only briefly described in order to highlight the gist of the present application.
The above is only a specific embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (9)
1. The method for dispatching the red-fed steel billets is characterized by comprising the following steps of:
(1) The steel making production workshop and the steel rolling production workshop normally produce billets, the red conveying speed of steel making direct conveying equipment reaches a set threshold value, the steel making speed is matched with the steel rolling speed, and a steel making direct conveying roller way is adopted to red convey billets to the steel rolling production workshop;
(2) When the indirect fault exists in the steelmaking direct-conveying roller way, and the red conveying speed is smaller than a set threshold value, obtaining the time for predicting the indirect fault, and calculating the backlog red conveying billet quantity according to the time for processing the indirect fault and the billet feeding speed; evaluating the transportation capacity of the flat trolley and the storage capacity of the heat preservation pit in the period of handling the indirect fault;
if the quantity of the backlogged red-fed billets is smaller than the transport capacity of the flat trolley, red-fed billets are fed by the flat trolley;
if the accumulated red steel billet quantity is larger than the transportation capacity of the flat trolley but smaller than the transportation capacity of the flat trolley and the storage capacity of the heat preservation pit, red-feeding by the flat trolley and carrying out billet transfer by combining the heat preservation pit;
if the quantity of the backlogged red steel billets is larger than the transportation capacity of the flat trolley 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 production workshop normally produces billets, the steel rolling production workshop has local faults or does not produce billets, the billets are transferred through the heat preservation pit, and the excessive billets are sent to other steel rolling production workshops.
2. The scheduling method according to claim 1, wherein the threshold value is a minimum speed value of the steel making direct-feeding device for red-feeding a billet under the condition of ensuring normal tapping in a steel rolling production plant.
3. The scheduling method according to claim 1, wherein the transportation capacity of the pallet truck is determined by the amount of billet and the hoisting time of the pallet truck full load and the turn-up time from the steel production plant to the steel rolling production plant.
4. A dispatching method according to claim 3, wherein if the full billet amount of the pallet truck is insufficient to support the number of billets required for steel rolling production in a period of time when the pallet truck returns to send the next batch of billets to the steel rolling production plant, the pallet truck of the second group is increased;
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 red billet feeding.
5. The scheduling method of claim 1, wherein,
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; and the flat trolley is also provided with a fixed bracket which can fix the billet and is convenient for hoisting.
6. The scheduling 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 trolley and is provided with more than two stress columns and fixing brackets;
the second heat insulation layer is arranged on the inner side of the heat insulation cover and is spaced more than 3mm from the heat insulation cover.
7. The scheduling method according to claim 5, wherein the flatbed trolley moves on rails laid from the steel production plant to the steel rolling production plant; metal detectors are arranged at the extreme ends of the rail in the steelmaking workshop and the extreme ends of the rail in the steel rolling workshop; after the metal detector 1 of the steelmaking workshop detects the flat trolley, feeding back to the PLC system, automatically opening the heat preservation cover, and closing the heat preservation cover when the flat trolley is far away and the metal detector 1 does not detect the flat trolley; after the metal detector 2 of the steel rolling production workshop detects the flat trolley, the heat preservation cover is automatically opened, and when the flat trolley returns, the metal detector 2 does not detect the flat trolley, and the heat preservation cover is closed.
8. The scheduling method according to claim 1, wherein the heat preservation pit is composed of a three-sided structure, the two side walls are reinforced concrete-heat preservation layer-reinforced concrete structure, and the bottom surface is reinforced concrete-heat preservation layer-reinforced concrete-heat preservation block.
9. The scheduling method of claim 1, wherein the steel making plant and the steel rolling plant are each hoisted using a unified clamp hoisting tool.
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| 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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