A time position map analysis method for plate rolling rhythm

Abstract

The application provides a kind of time-position map analysis method of plate rolling rhythm, belong to the field of automatic control of rolling steel.The method includes: obtaining the PDI data corresponding to the plate rolling rhythm to be analyzed, the set value and measured value of procedure parameter;After the slab leaves the rolling line, the slab head and tail position coordinates and time at key positions are calculated based on the obtained PDI data, the set and measured value of procedure parameter, and the time-position map of the slab on the rolling line is drawn based on the slab head and tail position coordinates and time at key positions;The value of rolling rhythm index is calculated according to the time-position map, and the calculated value of each rolling rhythm index is compared with the corresponding index value of historical same product specification, if the difference exceeds the preset range, an alarm prompt is given;Wherein, the rolling rhythm index includes: each subzone rhythm time, total rhythm time, rhythm bottleneck, mill occupancy rate and unit time output. By using the application, the speed of plate rolling rhythm can be accurately judged in real time, and the production rhythm bottleneck can be determined.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automatic control of steel rolling, in particular to a time-position map analysis method for rolling rhythm of medium plate. BACKGROUND

[0002] Rolling rhythm refers to the interval of the time of tapping between two adjacent billets. The goal of rolling rhythm control is to speed up the rolling rhythm as much as possible (i.e. shorten the interval of tapping) without causing collision between two adjacent billets on the rolling line, so as to improve the production capacity of the rolling line. Under the condition of ensuring production safety, the higher the rolling rhythm, the higher the unit time output of the rolling mill; otherwise, the lower the unit time output of the rolling mill. In actual production, process factors, etc. will directly affect the rolling rhythm, such as the specification of the billet to be rolled, the warm-up time, the rolling pass, the exit speed and other process factors, which directly determine the rhythm time of each region. Reasonably allocating the rolling pass can make the load of each unit uniform, improve the operation level, reduce the operation gap time, increase the deformation under the condition of equipment permission, comply with the rolling specification, reasonably group the billets, etc. to achieve the effect of shortening the rolling rhythm. The premise of determining the rhythm bottleneck and improving the rolling rhythm is to compare and analyze the real-time summary of the action time of each billet in rolling and the statistical data. The time-position map analysis of rolling rhythm can not only automatically analyze the current rolling rhythm profile, but also compare the indicators of rolling rhythm, find the optimization stage and optimization space, and give recommended indicator values under the warm-up mode for reference by the operation and technical personnel.

[0003] The research results of monitoring and analysis of medium plate rolling rhythm are as follows: the invention patent application with the application number CN101264484B discloses a medium plate high-speed rolling process, which can effectively shorten the temperature control and rolling time, reduce the rolling pass, speed up the rolling rhythm, improve the production efficiency of medium plate and increase the yield while keeping the organization and performance of medium plate qualified. The invention patent application with the application number CN110773570B discloses a method for improving the rolling rhythm of a 5-meter rolling mill, which improves the speed of the transfer roller and the speed of the air passing of the steel plate and shortens the distance of the pass, so that the rolling rhythm is significantly improved, and finally the rolling time of each steel plate is reduced by 18.4 seconds. The mathematical method for pre-calculation of medium plate cross-rolling rhythm control in the literature (mathematical method for pre-calculation of medium plate cross-rolling rhythm control) maps the ordering relationship and constraint conditions into a linear programming model through a priority constraint graph, and finally the optimal tapping time of each billet is obtained by solving the linear programming model. In the case, the rolling mill occupancy rate is increased to 72.2%, and the core content is the basic theory and application of the billet tapping rhythm control method.

[0004] The prior art introduces the process design of the plate rolling rhythm, the optimization of the control system, etc. in an all-round way, and proposes a small amount of evaluation indexes of the rolling rhythm to prove that the above-mentioned technology improves the plate rolling rhythm when rolling a few slabs, but cannot accurately judge the speed of the plate rolling rhythm. SUMMARY

[0005] The embodiment of the present application provides a time-position map analysis method of plate rolling rhythm, which can accurately judge the speed of the plate rolling rhythm in real time, determine the production rhythm bottleneck, and provide help for timely and accurate judgment of the rhythm bottleneck and improvement of the yield in the production site. The method comprises:

[0006] S101, acquiring PDI data corresponding to the plate rolling rhythm to be analyzed, and set values and measured values of process parameters;

[0007] S102, after the slab leaves the rolling line, respectively calculating the head and tail position coordinates and time of the slab at the key positions based on the acquired PDI data, set and measured values of the process parameters, and drawing a time-position map of the slab on the rolling line based on the head and tail position coordinates and time of the slab at the key positions;

[0008] S103, calculating the values of the rolling rhythm indexes according to the time-position map, and comparing the calculated values of the rolling rhythm indexes with the index values corresponding to the same product specification in history, and if the difference exceeds a preset range, an alarm is given; wherein the rolling rhythm indexes comprise: the time of each subzone rhythm, the total rhythm time, the rhythm bottleneck, the rolling mill occupancy rate, and the yield per unit time.

[0009] Further, the process parameters comprise: slab steel grade, slab specification, target specification, entry and exit time, rolling mode, exit length of each pass, exit speed of each pass, total rolling passes, steel biting and throwing time of each pass, intermediate slab water cooling start and end time, ultra-fast cooling start and end time, warm straightening start and end time, and hot straightening start and end time.

[0010] Further, the step of, after the slab leaves the rolling line, respectively calculating the head and tail position coordinates and time of the slab at the key positions based on the acquired PDI data, set and measured values of the process parameters, and drawing a time-position map of the slab on the rolling line based on the head and tail position coordinates and time of the slab at the key positions comprises:

[0011] Taking the slab leaving the rolling line as a trigger event, after the slab leaves the rolling line, based on the acquired PDI data, set and measured values of the process parameters, determining the head coordinate y 11,act (k) of the slab after the action k of the slab, the tail coordinate y′ 11,act (k) of the slab, and the time y″ 11,act (k) of the slab, respectively as:

[0012] y11,act (k) = y 11,act (k - 1) + Ay 11,act (k)

[0013] y' 11,act (k) = y' 11,act (k - 1) + Ay' 11,act (k)

[0014] y" 11,act (k) = y" 11,act (k - 1) + Ay" 11,act (k)

[0015] wherein Ay 11,act (k), Ay' 11,act (k), Ay" 11,act (k) are the slab head position moving distance, tail position moving distance, action k respectively;

[0016] According to the obtained slab head coordinate y 11,act (k), tail coordinate y' 11,act (k) and moment y" 11,act (k), the heating furnace entry and exit moments, the pass exit length, the pass exit speed, the rolling mill each pass bite and throw moments, the intermediate slab water cooling and finish cooling moments, the ultra-fast cooling cooling and finish cooling moments, the warm straightening start and end moments and the hot straightening start and end moments, the slab time-position diagram in the rolling line is drawn.

[0017] Further, the said partition rhythm time includes: the heating furnace rhythm time of the slab calculated by block, the average heating furnace rhythm time, the rolling mill rhythm time, the waiting warm rhythm time of the slab calculated by block, the average waiting warm rhythm time, the intermediate slab cooling rhythm time, the ultra-fast cooling rhythm time, the warm straightening rhythm time and the hot straightening rhythm time.

[0018] Further, the calculation process of the rolling mill rhythm time includes:

[0019] According to the first stage rolling first pass bite moment y' 3,act , the first stage rolling last pass throw moment y" 3,act , the second stage rolling first pass bite moment y'" 3,act and the second stage rolling last pass throw moment y" 3,ct , the rolling mill rhythm time y 3,act is determined:

[0020] y 3,act = (y" 3,act - y' 3,act ) + (y" 3,act - y' 3,act ).

[0021] Furthermore, the calculation process for the average waiting time for temperature regulation includes:

[0022] If the rolling mode is single-slab rolling, the average waiting time y 5,act Equal to the waiting time y of the slab calculated per block 4,act ,Right now:

[0023] y 5,act =y 4,act

[0024] If the rolling mode is double-slab rolling, the waiting time y′ of the second slab is determined according to the timing diagram. 5,act and the first stage rolling time y″ 5,act Determine the average waiting time y 5,act :

[0025] y″ 5,act =y″ 5,act,end -y″ 5,act,start

[0026] y 5,act =(y′) 5,act -y″ 5,act ) / 2

[0027] Among them, y″ 5,set,start y″ 5,set,end These represent the time of steel biting during the first pass of the second stage rolling process for the first billet in the double billet rolling process, and the time of steel ejection during the last pass of the second stage rolling process for the first billet;

[0028] If the rolling mode is three-slab rolling, the waiting time y′ of the second slab is determined according to the timing diagram. 5,act The first stage rolling time of the third piece y″ 5,act And the first piece of second stage rolling time y″′ 5,act Determine the average waiting time y 5,act :

[0029] y″ 5,act =y″ 5,act,end -y″ 5,act,start

[0030] y″′ 5,act =y″′ 5,set,end -y″′ 5,set,start

[0031] y 5,act =(y′) 5,act -y″ 5,act -y″′ 5,act ) / 3

[0032] Among them, y″5,act,start , y" and y'" respectively represent the first stage rolling first pass bite-in time of the third block, the first stage rolling last pass strip-off time of the third block, y" 5,act,end , y" and y'" respectively represent the first stage rolling first pass bite-in time of the third block, the first stage rolling last pass strip-off time of the third block, y" 5,act,start , y" and y'" respectively represent the first stage rolling first pass bite-in time of the third block, the first stage rolling last pass strip-off time of the third block, y" 5,act,end , y" and y'" respectively represent the first stage rolling first pass bite-in time of the third block, the first stage rolling last pass strip-off time of the third block, y"

[0033] Further, the calculation process of the ultrafast cooling rhythm time includes:

[0034] According to the water-penetration ultrafast cooling open cooling time y' 7,act (m) and the ultrafast cooling final cooling time y" 7,act (m), the ultrafast cooling cooling rhythm time y 7,act is determined:

[0035]

[0036] Wherein, N7 represents the total water-penetration times.

[0037] Further, the total rhythm time y 10,act is represented as:

[0038] y 10,act = max (y 2,act , (y 3,act +y 5,act +y 6,act ), y 7,act , y 8,act , y 9,act )+y safe

[0039] Wherein, y 2,act represents the average heating furnace rhythm time, y 3,act represents the rolling mill rhythm time, y 5,act represents the average waiting time rhythm, y 6,act represents the intermediate blank cooling rhythm time, y 7,act represents the ultrafast cooling cooling rhythm time, y 8,act represents the warm correction cooling rhythm time, y 9,act represents the hot correction cooling rhythm time, y safe is the safety time for avoiding collision between the slabs.

[0040] Further, the rolling mill occupancy rate y 12,act is represented as:

[0041] y 12,act = y 3,act / y 10,act *100

[0042] Wherein, y3,act represents the rolling mill rhythm time, y 10,act represents the total rhythm time.

[0043] Further, the unit time output y 13,act is represented as:

[0044] y 13,act = w 13,act / y 10,act

[0045] wherein y 10,act represents the total rhythm time, w 13,act is the slab single weight.

[0046] The technical scheme provided by the embodiment of the present application has at least the following beneficial effects:

[0047] In the embodiment of the present application, the analysis content of the plate rolling rhythm is decomposed into a plurality of specific indexes which are easy to quantify and easy to collect data, the values of each index are extracted through the time position diagram, and the calculation values of these indexes and the index values corresponding to the historical same product specifications are compared to generate an analysis result. In this way, through the time position diagram analysis method, comprehensive evaluation is performed from the aspects of the partition rhythm time, the total rhythm time, the rhythm bottleneck, the rolling mill occupancy rate, the unit time output, and the like, and the plate rolling rhythm speed can be accurately judged in real time, which provides help for the production site to accurately judge the rhythm bottleneck and improve the output in a timely manner. BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the technical scheme in the embodiment of the present application, the drawings needed to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0049] Figure 1 The flowchart of the time position diagram analysis method of the plate rolling rhythm provided by the embodiment of the present application is shown in the figure.

[0050] Figure 2 The single slab rolling time position diagram of the plate rolling rhythm provided by the embodiment of the present application is shown in the figure.

[0051] Figure 3 The double slab rolling time position diagram of the plate rolling rhythm provided by the embodiment of the present application is shown in the figure.

[0052] Figure 4 The three slab rolling time position diagram of the plate rolling rhythm provided by the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0053] In order to make the objects, technical solutions and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the drawings.

[0054] As shown in the drawings, Figure 1 the embodiment of the present application provides a time-position map analysis method for plate rolling rhythm, comprising:

[0055] S101, obtaining the Primary Data Input (PDI) data corresponding to the plate rolling rhythm to be analyzed, the set value and the measured value of the procedure parameters;

[0056] In the embodiment, the procedure parameters include: slab steel grade, slab specification, target specification, furnace entry and exit time, rolling mode, exit length of each pass, exit speed of each pass, total pass number, steel biting and throwing time of each pass, intermediate slab water cooling and final cooling time, ultra-fast cooling cooling and final cooling time, warm straightening start and end time, hot straightening start and end time, etc.

[0057] S102, taking the slab leaving the rolling line as a trigger event, after the slab leaving the rolling line, based on the obtained PDI data, the set and measured values of the procedure parameters, the slab head and tail position coordinates and time at the key positions (including: heating furnace, rolling mill, ultra-fast cooling, hot straightening, etc.) are calculated respectively, and the time-position map of the slab in the rolling line is drawn based on the slab head and tail position coordinates and time at the key positions.

[0058] In the embodiment, taking the slab leaving the rolling line as a trigger event, after the slab leaving the rolling line, based on the obtained PDI data, the set and measured values of the procedure parameters, the slab head coordinate y 11,act (k)、tail coordinate y′ 11,act (k) and time y″ 11,act (k) after the slab action k (i.e. moving from one key position to another key position) are determined, which are respectively represented as:

[0059] y 11,act (k) = y 11,act (k-1) + △y 11,act (k)

[0060] y′ 11,act (k) = y′ 11,act (k-1) + △y′ 11,act (k)

[0061] y″ 11,act (k) = y″ 11,act (k-1) + △y″ 11,act (k)

[0062] Wherein, △y 11,act (k)、△y′ 11,act(k), Δy" 11,act (k) are respectively the slab head position moving distance after action k, the tail position moving distance, and the action time.

[0063] In this embodiment, according to the obtained head coordinate y 11,act (k) of the slab 11,act (k) and the time y" 11,act (k), the entry and exit time of the heating furnace, the exit length of each pass, the exit speed of each pass, the entry and exit time of the mill for each pass, the entry and exit time of the water cooling and final cooling of the intermediate slab, the entry and exit time of the ultra-fast cooling and final cooling, the start and end time of the warm straightening, and the start and end time of the hot straightening, a time-position diagram of the slab in the rolling line is drawn.

[0064] In this embodiment, according to the time-position diagram, not only the value of the rolling rhythm index can be intuitively calculated, but also the production time length of the same slab in each process or the occupation time length of different slabs of the same product specification in the same process can be conveniently compared, and whether the selected rolling mode is suitable can also be conveniently judged.

[0065] S103, according to the time-position diagram, the value of the rolling rhythm index is calculated, and the calculated value of each rolling rhythm index is compared with the corresponding index value of the same product specification in the history, and if the difference exceeds the preset range, an alarm is given; wherein the rolling rhythm index includes: each partition rhythm time, total rhythm time, rhythm bottleneck, mill occupancy rate, and unit time output, etc.

[0066] In this embodiment, the partition rhythm time includes: the heating furnace rhythm time of the slab (by block), the average heating furnace rhythm time, the mill rhythm time, the waiting warm rhythm time of the slab (by block), the average waiting warm rhythm time, the intermediate slab cooling rhythm time, the ultra-fast cooling rhythm time, the warm straightening rhythm time, and the hot straightening rhythm time.

[0067] In this embodiment, the calculation and comparison process of each rolling rhythm index is as follows:

[0068] 1) The heating furnace rhythm time of the slab (by block)

[0069] In this embodiment, according to the entry time y' 1,act and the exit time y" 1,act of the slab on the time-position diagram, the heating furnace rhythm time y 1,act of the slab (by block) is determined:

[0070] y 1,act = y" 1,act - y' 1,act

[0071] The difference Ay1 between the obtained heating furnace rhythm time of the slab (per block) and the historical heating furnace rhythm time of the same product specification slab (per block) is compared with the preset range [thdl, thd'l] in real time, and when the calculation result Ay1 exceeds the preset range [thdl, thd'l], an alarm is given in time to remind the on-site personnel to check and adjust the heating furnace in-furnace time and tapping rhythm.

[0072] 2) Average heating furnace rhythm time

[0073] In this embodiment, the heating furnace rhythm time y 1,act of the slab (per block) is determined according to the in-furnace time of the slab (per block) and the number N1 of slabs in the furnace, and the average heating furnace rhythm time y 2,act is determined according to the number N1 of slabs in the furnace and the average in-furnace time y 1,act :

[0074] y 2,act = y 1,act / N1

[0075] The difference Ay2 between the obtained average heating furnace rhythm time and the historical average heating furnace rhythm time of the same product specification is compared with the preset range [thd2, thd'2] in real time, and when the calculation result Ay2 exceeds the preset range [thd2, thd'2], an alarm is given in time to remind the on-site personnel to check and adjust the heating furnace in-furnace time and tapping rhythm.

[0076] 3) Rolling mill rhythm time

[0077] In this embodiment, the rolling mill rhythm time is determined according to the coordinates of the start time / end time of the first stage rolling and the second stage rolling on the time-position diagram, and can specifically include the following steps:

[0078] The rolling mill rhythm time y 3,act is determined according to the first-pass biting time y' 3,act of the first stage rolling, the last-pass casting time y" 3,act of the first stage rolling, the first-pass biting time y''' 3,act of the second stage rolling, and the last-pass casting time y""" 3,act of the second stage rolling:

[0079] y 3,act = (y" 3,act -y' 3,act ) + (y""" 3,act -y''' 3,act )

[0080] The difference Ay3 between the obtained rolling mill rhythm time and the historical same-gauge rolling mill rhythm time is compared with the preset range [thd3, thd'3] in real time, and a determination is made. When the calculation result Ay3 exceeds the preset range [thd3, thd'3], an alarm is given in time to remind the on-site personnel to check and adjust the rolling pass interval and the like.

[0081] 4) Warm-up rhythm time of the slab (per block)

[0082] In this embodiment, the warm-up rhythm time of the slab (per block) is determined according to the coordinates of the slab bite and drop steel start and end times on the time-position map. Specifically:

[0083] According to the time-position map, the first stage rolling last pass drop steel time y" 3,act And the second stage rolling first pass bite steel time y" 3,act The warm-up rhythm time y of the slab (per block) is determined: 4,act

[0084] y 4,act =y" 3,act -y" 3,act

[0085] The difference Ay4 between the obtained warm-up rhythm time of the slab (per block) and the historical same-gauge warm-up rhythm time of the slab (per block) is compared with the preset range [thd4, thd'4] in real time, and a determination is made. When the calculation result y 4,act exceeds the preset range [thd4, thd'4], an alarm is given in time to remind the on-site personnel to check and adjust the roller action time and the like.

[0086] 5) Average warm-up rhythm time

[0087] In this embodiment, the average warm-up rhythm time is determined according to the coordinates of the start / end times of the gaps between the rolling stages of the rolling mill on the time-position map. Specifically, the following steps can be included:

[0088] If the rolling mode is single-slab rolling, the average warm-up rhythm time y 5,act is equal to the warm-up rhythm time y 4,act of the slab (per block), that is:

[0089] y 5,act =y 4,act

[0090] If the rolling mode is double-slab rolling, the average warm-up rhythm time y 5,act is determined according to the warm-up rhythm time y' of the second block of the slab and the second stage rolling time y" 5,act of the first block: 5,act

[0091] y"​​5,act =y″ 5,act,end -y″ 5,act,start

[0092] y 5,act =(y′) 5,act -y″ 5,act ) / 2

[0093] Among them, y″ 5,set,start y″ 5,set,end These represent the time of steel biting during the first pass of the second stage rolling process for the first billet in the double billet rolling process, and the time of steel ejection during the last pass of the second stage rolling process for the first billet;

[0094] If the rolling mode is three-slab rolling, the waiting time y′ of the second slab is determined according to the timing diagram. 5,act The first stage rolling time of the third piece y″ 5,act and the first piece of second stage rolling time y″′ 5,act Determine the average waiting time y 5,act :

[0095] y″ 5,act =y″ 5,act,end -y″ 5,act,start

[0096] y″′ 5,act =y″′ 5,set,end -y″′ 5,set,start

[0097] y 5,act =(y′) 5,act -y″ 5,act -y″ 5,act ) / 3

[0098] Among them, y″ 5,act,start y″ 5,act,end These represent the times when the steel bites during the first pass of the first stage of rolling the third billet and the times when the steel is ejected during the last pass of the first stage of rolling the third billet, respectively. y″′ 5,act,start y″′ 5,act,end These represent the time of the first pass of the second stage rolling process for the first billet of the three-slab rolling process, and the time of the last pass of the second stage rolling process for the first billet.

[0099] The average mill rhythm time y is obtained in real time. 5,act The difference △y5 between the calculated result and the historical average mill rhythm time of the same product specification is compared with the preset range [thd5, thd′5] and a judgment is made. When the calculated result △y5 exceeds the preset range [thd5, thd′5], an alarm is triggered in time to remind on-site personnel to check and adjust the roller table movement time, etc.

[0100] 6) Intermediate billet cooling rhythm and time

[0101] In this embodiment, the intermediate blank cooling rhythm time is determined according to the coordinate values of the intermediate blank cooling start and end time on the time bitmap, specifically including:

[0102] According to the mth water penetration start time y' 6,act (m) and the final cooling time y" 6,act (m), the intermediate blank cooling rhythm time y 6,act :

[0103]

[0104] Wherein, N6 represents the total number of water penetration.

[0105] The difference Ay6 between the obtained intermediate blank cooling rhythm time and the historical intermediate blank cooling rhythm time of the same product specification is compared with the preset range [thd6, thd'6] in real time, and a determination is made. When the calculation result Ay6 exceeds the preset range [thd6, thd'6], an alarm is given in time to remind the on-site personnel to check and adjust the intermediate blank cooling time and the roller action time, etc.

[0106] 7) Ultra-fast cooling rhythm time

[0107] In this embodiment, the ultra-fast cooling cooling rhythm time is determined according to the coordinate values of the ultra-fast cooling cooling start and end time on the time bitmap, specifically including:

[0108] According to the mth water penetration ultra-fast cooling start time y' 7,act (m) and the ultra-fast cooling final cooling time y" 7,act (m), the ultra-fast cooling cooling rhythm time y 7,act :

[0109]

[0110] Wherein, N7 represents the total number of water penetration.

[0111] The difference Ay6 between the obtained ultra-fast cooling cooling rhythm time and the historical ultra-fast cooling cooling rhythm time of the same product specification is compared with the preset range [thd7, thd'7] in real time, and a determination is made. When the calculation result Ay6 exceeds the preset range [thd7, thd'7], an alarm is given in time to remind the on-site personnel to check and adjust the ultra-fast cooling cooling time and the roller action time, etc.

[0112] 8) Warm straightening rhythm time

[0113] In this embodiment, the warm straightening rhythm time is determined according to the coordinate values of the warm straightening start and end time on the time bitmap, specifically including:

[0114] According to the mth warm straightening straightening start time y' 8,act (m) and the end time y"8,act (m), determine the warm straightening rhythm time y 8,act :

[0115]

[0116] Wherein, N8 represents the total number of straightening times.

[0117] The difference △y8 between the obtained warm straightening rhythm time and the historical warm straightening rhythm time of the same product specification is compared with the preset range [thd8, thd'8] in real time, and a determination is made. When the calculation result △y8 exceeds the preset range [thd8, thd'8], an alarm is given in time to remind the on-site personnel to check and adjust the warm straightening time of the roller bed action time, etc.

[0118] 9) Hot straightening rhythm time

[0119] In this embodiment, according to the coordinate values of the starting and ending time of hot straightening on the time position map, the hot straightening rhythm time is determined, including:

[0120] According to the starting time y' 9,act (m) of the mth hot straightening straightening 9,act (m), determine the hot straightening rhythm time y 9,act :

[0121]

[0122] In the above formula, N9 represents the total number of straightening times.

[0123] The difference △y9 between the obtained hot straightening rhythm time and the historical hot straightening rhythm time of the same product specification is compared with the preset range [thd9, thd'9] in real time, and a determination is made. When the calculation result △y9 exceeds the preset range [thd9, thd'9], an alarm is given in time to remind the on-site personnel to check and adjust the hot straightening time of the roller bed action time, etc.

[0124] 10) Total rhythm time

[0125] According to the average heating furnace rhythm time y 2,act , the mill rhythm time y 3,act , the average waiting for warm rhythm time y 5,act , the intermediate blank cooling rhythm time y 6,act , the ultra-fast cooling cooling rhythm time y 7,act , the warm straightening cooling rhythm time y 8,act , and the hot straightening cooling rhythm time y 9,act , the total rhythm time y 10,act is determined:

[0126] y 10,act = max(y 2,act , (y 3,act +y5,act + y 6,act ), y 7,act , y 8,act , y 9,act + y safe

[0127] wherein y safe is the safety time for avoiding collision between the slabs.

[0128] The difference Ay 10 between the total rhythm time obtained in real time and the historical total rhythm time of the same product specification is compared with the preset range [thd 10 , thd' 10 ] and determined, and when the calculation result Ay 10 exceeds the preset range [thd 10 , thd' 10 ], an alarm is given in time to remind the on-site personnel to check and adjust the roller action time, etc.

[0129] 11) Rhythm bottleneck

[0130] In this embodiment, the average heating furnace rhythm time y 2,act , the rolling mill rhythm time y 3,act , the average waiting time y 5,act , the intermediate slab cooling rhythm time y 6,act , the ultra-fast cooling cooling rhythm time y 7,act , the warm straightening cooling rhythm time y 8,act and the hot straightening cooling rhythm time y 9,act are compared, and the rhythm bottleneck can be obtained, and the area with the longest rhythm time is the bottleneck area of the rolling line.

[0131] 12) Rolling mill occupancy rate

[0132] In this embodiment, according to the rolling mill rhythm time y 3,act and the total rhythm time y 10,act , the rolling mill occupancy rate y 12,act is determined:

[0133] y 12,act = y 3,act / y 10,act *100

[0134] The difference Ay 12 between the rolling mill occupancy rate obtained in real time and the historical rolling mill occupancy rate of the same product specification is compared with the preset range [thd 12 , thd' 12 ] and determined, and when the calculation result Ay 12 exceeds the preset range [thd 12 , thd' 12The system should promptly issue an alarm to remind on-site personnel to check and adjust the roller conveyor's operating time.

[0135] 13) Output per unit time

[0136] In this embodiment, based on the total rhythm time y 10,act and slab weight w 13,act Determine the output per unit time y 13,act :

[0137] y 13,act =w 13,act / y 10,act

[0138] Among them, w 13,act This refers to the weight of a single slab.

[0139] The difference Δy between the obtained output per unit time and the historical output per unit time of the same product specification is calculated in real time. 13 With respect to the preset range [thd] 13 ,thd′ 13 Compare and determine, when the calculated result △y 13 Exceeding the preset range [thd] 13 ,thd′ 13 The system should promptly issue an alarm to remind on-site personnel to check and adjust the roller conveyor's operating time.

[0140] To better understand the present invention, the effects of the method in this embodiment will be explained below in conjunction with specific applications.

[0141] The time-position diagram analysis method for the rolling rhythm of medium and heavy plates provided in this embodiment was applied to a medium and heavy plate production line. The results of the rolling rhythm monitoring indicators in this embodiment are shown in Table 1. From Table 1, the calculation results of each rolling rhythm indicator and the rhythm bottleneck can be quickly queried.

[0142] Table 1 Calculation results of rolling rhythm index for medium and heavy plates

[0143] Rolling rhythm indicators Data Furnace rhythm time (per block) s 15540 Furnace rhythm time (average) s 353 Rolling mill rhythm time s 339 Tempering rhythm time (per block) s 446 Tempering rhythm time (average) s 68.5 Intermediate blank cooling rhythm time s 0 Ultra-fast cooling cooling rhythm time s 19 Warm straightening rhythm time s 153 Hot straightening rhythm time s 0 Total rhythm time s 407.5 Rhythm bottleneck Rolling mill Rolling mill occupancy rate % 83.1 Output per unit time ton / s 4.84

[0144] Figure 2 , Figure 3 , Figure 4 The diagrams represent the time and position of single-slab rolling, double-slab rolling, and three-slab group rolling, respectively. The horizontal axis represents the position coordinates, and the vertical axis represents time. They can clearly show the position changes of the head and tail of the steel plate over time, making it convenient for on-site personnel to compare the speed of steel plate rolling and to check the changes in the relative positions of each slab in the group during multi-slab rolling.

[0145] The method for analyzing the time position map of the plate rolling rhythm according to the embodiment of the present application decomposes the analysis content of the plate rolling rhythm into a plurality of specific indexes which are easy to quantify and easy to collect data, extracts the values of each index through the time position map, and compares the calculated values of the indexes with the index values corresponding to the same product specification in history to generate an analysis result. In this way, the time position map analysis method can comprehensively evaluate the rhythm time of each partition, the total rhythm time, the rhythm bottleneck, the rolling mill occupancy rate, the unit time output, and the like, and can accurately determine the speed of the plate rolling rhythm in real time, thereby providing help for the production site to accurately determine the rhythm bottleneck and improve the output in a timely manner.

[0146] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A time-position diagram analysis method for the rolling rhythm of medium-thick plates, characterized in that, include: S101, obtain the PDI data, the set values ​​and measured values ​​of the procedure parameters corresponding to the rolling rhythm of the medium and heavy plate to be analyzed; S102, after the slab leaves the rolling line, the coordinates and time of the slab head and tail positions at the key positions are calculated based on the acquired PDI data, the setting of the procedure parameters and the measured values. The time position diagram of the slab on the rolling line is drawn based on the coordinates and time of the slab head and tail positions at the key positions. S103, calculate the value of the rolling rhythm index according to the time position diagram, and compare the calculated value of each rolling rhythm index with the corresponding index value of the same product specification in history. If the difference exceeds the preset range, an alarm is issued. The rolling rhythm index includes: rhythm time of each zone, total rhythm time, rhythm bottleneck, mill occupancy rate and output per unit time.

2. The time-position diagram analysis method for the rolling rhythm of medium and heavy plates according to claim 1, characterized in that, The specified parameters include: slab steel grade, slab specifications, target specifications, furnace entry and exit times, rolling mode, exit length of each pass, exit speed of each pass, total number of rolling passes, bite and ejection times of each pass, water cooling and final cooling times of intermediate slabs, cooling and final cooling times of ultra-fast cooling, start and end times of temperature straightening, and start and end times of hot straightening.

3. The time-position diagram analysis method for the rolling rhythm of medium and heavy plates according to claim 1, characterized in that, After the slab leaves the rolling line, the coordinates and times of the slab's head and tail positions at key locations are calculated based on the acquired PDI data, the set parameters of the procedure, and the measured values. The time-position diagram of the slab on the rolling line is then drawn based on these coordinates and times. The slab leaving the rolling line is used as the trigger event. After the slab leaves the rolling line, based on the acquired PDI data, the set parameters of the procedure, and the measured values, the head coordinate y of the slab after the slab action k is determined. 11,act (k), Tail coordinates y1′ 1,act (k) and time y1″ 1,act (k), respectively, are represented as: and 11,act (k)=y 11,act (k-1)+△y 11,act (k) y1′ 1,act (k)=y1′ 1,act (k-1)+△y1′ 1,act (to) y1″ 1,act (k)=y1″ 1,act (k-1)+△y1″ 1,act (to) Among them, △y 11,act (k), △y1′ 1,act (k), △y1″ 1,act (k) represents the distance the slab head moves, the distance the tail moves, and the time taken after action k. Based on the obtained head coordinates y of the slab 11,act (k), Tail coordinates y1′ 1,act (k) and time y1″ 1,act (k), the time of entering and exiting the heating furnace, the exit length of each pass, the exit speed of each pass, the time of steel biting and steel throwing of each pass of the rolling mill, the time of water cooling and final cooling of intermediate billets, the time of water cooling and final cooling of ultra-fast cooling, the time of start and end of temperature straightening and the time of start and end of hot straightening, and draw the time position diagram of the slab on the rolling line.

4. The time-position diagram analysis method for the rolling rhythm of medium and heavy plates according to claim 1, characterized in that, The zoned rhythm time includes: the heating furnace rhythm time of slabs calculated per block, the average heating furnace rhythm time, the rolling mill rhythm time, the waiting time for slabs to reach the desired temperature calculated per block, the average waiting time for the desired temperature, the intermediate slab cooling rhythm time, the ultra-fast cooling rhythm time, the temperature straightening rhythm time, and the hot straightening rhythm time.

5. The time-position diagram analysis method for the rolling rhythm of medium-thick plates according to claim 4, characterized in that, The calculation process for the rolling mill rhythm time includes: According to the timing diagram, the first bite time y′ of the first stage of rolling is... 3,act The timing of the final pass of the first stage rolling process, y″ 3,act The first bite time of the second stage rolling process y″′ 3,act Second stage rolling final pass steel blasting time y″″ 3,act Determine the rolling mill rhythm time y 3,act : and 3,act =(y″ 3,act -and' 3,act )+(and″″ 3,act -and"' 3,act )。 6. The time-position diagram analysis method for the rolling rhythm of medium-thick plates according to claim 4, characterized in that, The calculation process for the average waiting time includes: If the rolling mode is single-slab rolling, the average waiting time y 5,act Equal to the waiting time y of the slab calculated per block 4,act ,Right now: and 5,act / and 4,act If the rolling mode is double-slab rolling, the waiting time y′ of the second slab is determined according to the timing diagram. 5,act and the first stage rolling time y″ 5,act Determine the average waiting time y 5,act : and" 5,act =y″ 5,act,end -and" 5,act,start and 5,act =(y′ 5,act -and" 5,act ) / 2 Among them, y″ 5,set,start y″ 5,set,end These represent the time of steel biting during the first pass of the second stage rolling process for the first billet in the double billet rolling process, and the time of steel ejection during the last pass of the second stage rolling process for the first billet; If the rolling mode is three-slab rolling, the waiting time y′ of the second slab is determined according to the timing diagram. 5,act The first stage rolling time of the third piece y″ 5,act And the first piece of second stage rolling time y″′ 5,act Determine the average waiting time y 5,act : and" 5,act =y″ 5,act,end -and" 5,act,start and"' 5,act =y″′ 5,set,end -and"' 5,set,start and 5,act =(y′ 5,act -and" 5,act -and"' 5,act ) / 3 Among them, y″ 5,act,start y″ 5,act,end These represent the times when the steel bites during the first pass of the first stage of rolling the third billet and the times when the steel is ejected during the last pass of the first stage of rolling the third billet, respectively. y″′ 5,act,start y″′ 5,act,end These represent the time of the first pass of the second stage rolling process for the first billet of the three-slab rolling process, and the time of the last pass of the second stage rolling process for the first billet.

7. The time-position diagram analysis method for the rolling rhythm of medium-thick plates according to claim 4, characterized in that, The calculation process for the ultra-fast cooling cycle time includes: Based on the m-th water-passing ultra-fast cooling start-up time y′ 7,act (m) and the final cooling time of ultrafast cooling y″ 7,act (m), determine the ultra-fast cooling rhythm time y 7,act : N7 represents the total number of times the water was traversed.

8. The time-position diagram analysis method for the rolling rhythm of medium-thick plates according to claim 4, characterized in that, Total tempo time y 10,act Represented as: and 10,act =max(y 2,act ,(and 3,act +and 5,act +and 6,act ),and 7,act ,and 8,act ,and 9,act )+and safe Among them, y 2,act Indicates the average furnace rhythm time, y 3,act Indicates the rolling mill rhythm time, y 5,act Indicates the average waiting time for temperature rise, y 6,act Indicates the cooling rhythm time of the intermediate billet, y 7,act Indicates the ultra-fast cooling cycle time, y 8,act Indicates the temperature correction cooling cycle time, y 9,act Indicates the thermal correction cooling cycle time, y safe This provides a safe time to prevent collisions between slabs.

9. The time-position diagram analysis method for the rolling rhythm of medium-thick plates according to claim 1, characterized in that, Rolling mill occupancy rate y 12,act Represented as: and 12,act / and 3,act / and 10,act *100 Among them, y 3,act Indicates the rolling mill rhythm time, y 10,act Indicates the total tempo time.

10. The time-position diagram analysis method for the rolling rhythm of medium-thick plates according to claim 1, characterized in that, Output per unit time y 13,act Represented as: y 13,act =w 13,act / y 10,act Among them, y 10,act w represents the total tempo time. 13,act This refers to the weight of a single slab.

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