Blending method for steel rod grading of industrial rod mill

Abstract

The invention discloses an industrial rod mill steel rod grading blending method, and belongs to the technical field of coal water slurry grinding, and the method comprises the following steps: S1, determining the number of steel rods; s2, determining a stable stacking mode of the steel bars; s3, calculating a gap area of stacking grading of the steel bars; s4, the probability of grading stacking of the steel bars is calculated; and S5, calculating the accumulated stacking gap area of the steel bar stacking gradation. According to the blending method for the grading of the steel rods of the industrial rod mill, a quantitative blending model is established by constructing a steel rod stacking mode and calculating related parameters, and a traditional experience rod blending mode is replaced, so that the grading is more basis; meanwhile, the influence of steel rod grading on the slurry forming characteristic of the coal water slurry is determined, the grading state can be monitored in real time, supplementing parameters can be calculated, the steel rod grading can be effectively optimized, the grinding efficiency of a rod mill is improved, and the particle size distribution and the slurry forming quality of the coal water slurry are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of coal water slurry grinding, and particularly relates to a method for adjusting the size distribution of steel rods of an industrial rod mill. BACKGROUND

[0002] The industrial rod mill is a key grinding equipment widely used in the fields of metallurgy, mining engineering, coal chemical industry, ceramic industry and the like, and its core working component is a steel rod (grinding medium) which is used to break and refine materials through impact and grinding during the operation of the mill; the size distribution (diameter, type, quantity ratio, etc.) of the steel rod directly affects the grinding efficiency, particle distribution and quality of the finished material.

[0003] The coal water slurry is a new coal-based clean fuel with oil-like fluidity and good stability, and the grinding is a key link in the preparation of the coal water slurry; the overflow rod mill is widely used in the preparation of the coal water slurry for coal gasification due to its unique selection and breaking advantages. The coal water slurry grinding not only requires fineness, but also requires good particle size distribution. However, the existing technology has the following disadvantages: there is no solution to the problem of reasonable rod distribution of the rod mill, and the selection of the proportion of different rod diameters is mostly dependent on experience tables or the principle of "the same number of steel rods of various diameters", which is insufficient; although the rod mill is a traditional general-purpose equipment in many industries, the experience such as power consumption and capacity calculation cannot be directly applied to the coal water slurry grinding, and there is little targeted data; the coal water slurry grinding not only requires the product to reach a certain fineness, but also is sensitive to particle size distribution, but the existing technology cannot accurately match this special requirement, which affects the quality of the coal water slurry slurry; during the grinding process, the diameter of the steel rod decreases due to wear, the original size distribution relationship changes, and the existing technology lacks effective monitoring and dynamic adjustment means.

[0004] Therefore, a new method is urgently needed. SUMMARY

[0005] The purpose of the present application is to provide a method for adjusting the size distribution of steel rods of an industrial rod mill, which establishes a quantitative adjustment model by constructing a steel rod stacking mode and calculating relevant parameters, replaces the traditional experience-based rod distribution method, and makes the size distribution more reliable; at the same time, the influence of the size distribution of the steel rods on the slurry forming characteristics of the coal water slurry is determined, the size distribution state can be monitored in real time, the addition parameters can be calculated, the size distribution of the steel rods can be effectively optimized, the grinding efficiency of the rod mill is improved, and the particle size distribution and slurry forming quality of the coal water slurry are improved.

[0006] To achieve the above purpose, the present application provides a method for adjusting the size distribution of steel rods of an industrial rod mill, which comprises the following steps:

[0007] S1. calculating the number of various steel rods according to the type, ratio, total weight, weight of a single steel rod, steel rod ratio and diameter of the steel rods in the rod mill;

[0008] S2. determining the mode of the steel rods forming a stable stack according to the type and number of the steel rods filled in the rod mill;

[0009] S3, according to the mode of stacking in S2, calculate the stacking stress area S T , the calculation formula is as follows:

[0010]

[0011] a = R C + R B , b = R C + R A , c = R A + R B ;

[0012] Wherein, s represents the intermediate calculation amount; a represents the sum of the radius of steel bar C and steel bar B; b represents the sum of the radius of steel bar C and steel bar A; c represents the sum of the radius of steel bar A and steel bar B; R A represents the radius of steel bar A; R B represents the radius of steel bar B; R C represents the radius of steel bar C;

[0013] S4, according to the total number of steel bars and the number of each type of steel bar, calculate the probability of stacking mode of three, four and five steel bars respectively.

[0014] S5, according to the stacking stress area in S3 and the probability of stacking mode in S4, calculate the cumulative stacking gap area of steel bar stacking gradation.

[0015] Preferably, in S3, the stacking stress area is a triangular area formed by connecting the centers of the cross sections of the three steel bars.

[0016] Preferably, in S4, the probability calculation formula of three steel bar stacking gradation is:

[0017]

[0018] Wherein,

[0019]

[0020] The probability calculation expansion formula of other seven stacking modes is similar, and will not be listed one by one.

[0021] Wherein,

[0022] N = N1 + N2 + N3;

[0023] P = P 111 + P 112 + P 113 + P 123 + P 221 + P 222 + P223 +P 331 +P 332 +P 333 = 1;

[0024] wherein, N represents the total number of steel rods in the rod mill, N1, N2, N3 respectively represent the number of steel rods corresponding to the three kinds of steel rods; P 111 represents the probability of the occurrence of 111 steel rod stacking in the steel rod stacking grading; other P values correspond to the probability of steel rod stacking one by one.

[0025] Preferably, the probability calculation formula of the accumulation grading of the four kinds of steel rods in S4 is:

[0026]

[0027] wherein,

[0028]

[0029] The probability calculation expansion formula of other 17 stacking modes is expanded in this way, and is not listed one by one.

[0030] wherein,

[0031] N = N1 + N2 + N3 + N4;

[0032]

[0033] wherein, N1, N2, N3, N4 respectively represent the number of steel rods corresponding to the four kinds of steel rods; P 444 represents the probability of the occurrence of 444 steel rod stacking in the steel rod stacking grading.

[0034] Preferably, the probability calculation formula of the accumulation grading of the five kinds of steel rods in S4 is:

[0035]

[0036] wherein,

[0037]

[0038] The probability calculation expansion formula of other 32 stacking modes is expanded in this way, and is not listed one by one.

[0039] wherein,

[0040] N = N1 + N2 + N3 + N4 + N5;

[0041]

[0042] wherein, N1, N2, N3, N4, N5 respectively represent the number of steel rods corresponding to the five kinds of steel rods; P 555Probability of occurrence of 555 steel rod stacking grading in steel rod stacking grading.

[0043] Preferably, the cumulative stacking gap area calculation formula of three steel rod accumulations in S5 is:

[0044]

[0045] Wherein, ΣPS T3 Indicates the cumulative stacking gap area of four steel rods; S 333 Indicates the triangular area surrounded by 444 stacking mode.

[0046] Preferably, the cumulative stacking gap area calculation formula of four steel rod accumulations in S5 is:

[0047]

[0048] Wherein, ΣPS T4 Indicates the cumulative stacking gap area of four steel rods; S 444 Indicates the triangular area surrounded by 444 stacking mode.

[0049] Preferably, the cumulative stacking gap area calculation formula of five steel rod accumulations in S5 is:

[0050]

[0051] Wherein, ΣPS T5 Indicates the cumulative stacking gap area of five steel rods; S 555 Indicates the triangular area surrounded by 555 stacking mode.

[0052] Therefore, the present application adopts the above-mentioned industrial rod mill steel rod grading adjustment method, compared with the prior art, the technical scheme of the present application has the following beneficial effects:

[0053] (1) The present application establishes a quantitative deployment model by constructing steel rod accumulation mode, calculating probability and gap parameters, replacing the traditional rod deployment relying on experience table or "equal number" principle, so that the steel rod grading has basis;

[0054] (2) The present application solves the problem of few reference materials of rod mill grading in coal water slurry grinding field by establishing the influence mechanism of steel rod grading on coal water slurry slurry forming characteristics, and provides targeted support for the special needs of coal water slurry grinding;

[0055] (3) The present application reduces the problem of imbalance of steel rod grading caused by steel rod wear by real-time monitoring of steel rod grading state through the model and calculating the parameters of steel rod supplement, and provides accurate basis for steel rod supplement;

[0056] (4) The present application optimizes the steel rod gradation through a quantitative model, solves the problem that the traditional gradation is difficult to balance the grinding efficiency and the coal water slurry particle size distribution quality, improves the grinding efficiency of the rod mill, improves the coal water slurry particle size distribution, and improves the slurry quality.

[0057] The technical solutions of the present application will be further described in detail below with the help of the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0058] Figure 1 The steady-state stacking pattern diagram of the steel rod cross section of the embodiment of the present application, a method for adjusting the steel rod gradation of an industrial rod mill; Figure 1 (a) in the figure represents the case of three kinds of steel rods; Figure 1 (b) in the figure represents the case of four kinds of steel rods; Figure 1 (c) in the figure represents the case of five kinds of steel rods;

[0059] Figure 2 The schematic diagram of the calculation of the steel rod stacking gap of the embodiment of the present application, a method for adjusting the steel rod gradation of an industrial rod mill;

[0060] Figure 3 The schematic diagram of the steel rod gradation in the rod mill in different states of the embodiment of the present application, a method for adjusting the steel rod gradation of an industrial rod mill; Figure 3 (a) in the figure represents the initial state of the steel rod gradation of the rod mill; Figure 3 (b) in the figure represents the mixed state of the steel rods; Figure 3 (c) in the figure represents the steel rod gradation in the light wear state; Figure 3 (d) in the figure represents the state after the first addition of the steel rods; Figure 3 (e) in the figure represents the steel rod gradation in the serious wear state; Figure 3 (f) in the figure represents the state after the second addition of the steel rods; DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with the help of the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application. Unless otherwise defined, the technical terms or scientific terms used in the present application should be understood as the usual meanings understood by those of ordinary skill in the art to which the present application belongs.

[0062] Embodiment one

[0063] As shown in Figures 1-3 , a method for adjusting the steel rod gradation of an industrial rod mill of the present application comprises the following steps:

[0064] S1, according to the type, proportion, total weight, single steel rod weight, steel rod proportion and steel rod diameter of the steel rod in the rod mill, the number N1, N2, N3...N of various steel rods is calculated X Wherein x represents the number of steel rods; in order to reduce the calculation difficulty, the steel rods can be classified into three diameters according to the actual diameter for approximate calculation;

[0065] S2, according to the type and number n of the steel rods filled in the rod mill, the mode of the steel rods forming stable stacking is determined, and the calculation formula is as follows:

[0066]

[0067] The steel rod cross section stable stacking mode diagram of steel rod type number 3, 4 and 5, respectively corresponding to 10, 20 and 35 arrangement modes;

[0068] S3, in the three steel rod stable stacking state, the effective stacking stress area S of the triangle area formed by connecting the centers of the three steel rod sections T The calculation formula is as follows:

[0069]

[0070] a = R C + R B , b = R C + R A , c = R A + R B ;

[0071] Wherein, s represents the intermediate calculation quantity; a represents the sum of the radius of steel rod C and steel rod B; b represents the sum of the radius of steel rod C and steel rod A; c represents the sum of the radius of steel rod A and steel rod B; R A Represents the radius of steel rod A; R B Represents the radius of steel rod B; R C Represents the radius of steel rod C;

[0072] S4, according to the total number of steel rods and the number of various types of steel rods, the occurrence probability of each stacking mode is calculated according to the corresponding probability calculation formula for three, four and five steel rod stacking gradation modes, and the probability sum of all stacking modes under a single type number is 1;

[0073] In this step, the stacking gradation of three steel rods has 10 stable stacking gradation modes, and the probability calculation formula is:

[0074]

[0075] Wherein,

[0076]

[0077] Other 7 stack probability calculation formula, and so on, not one by one to expand listed;

[0078] Wherein,

[0079] N=N1+N2+N3;

[0080] P=P 111 +P 112 +P 113 +P 123 +P 221 +P 222 +P 223 +P 331 +P 332 +P 333 =1;

[0081] Wherein, N represents the total number of steel bar in the rod mill, N1, N2, N3 respectively represent the number of steel bar corresponding to three kinds of steel bar; P 111 The probability of the occurrence of 111 steel bar stack grading in the steel bar stack grading; other P values correspond to the probability of steel bar stack grading one by one;

[0082] Four kinds of steel bar stack grading, there are 20 kinds of stable state stack grading mode, the probability of the formula is:

[0083]

[0084] Wherein,

[0085]

[0086] Other 17 stack probability calculation formula, and so on, not one by one to expand listed;

[0087] Wherein,

[0088] N=N1+N2+N3+N4;

[0089]

[0090] Wherein, N1, N2, N3, N4 respectively represent the number of steel bar corresponding to four kinds of steel bar; P 444 The probability of the occurrence of 444 steel bar stack grading in the steel bar stack grading; other P values correspond to the probability of steel bar stack grading one by one;

[0091] Five kinds of steel bar stack grading, there are 35 kinds of stable state stack grading mode, the probability of the formula is:

[0092]

[0093] wherein,

[0094]

[0095] The probability calculation expansion formula of other 32 stacking modes is expanded in the same way, which is not listed one by one.

[0096] wherein,

[0097] N=N1+N2+N3+N4+N5;

[0098]

[0099] wherein, N1, N2, N3, N4, N5 represent the number of steel bars corresponding to the five kinds of steel bars respectively; P 555 represents the probability of the occurrence of 555 steel bar stacking gradation in the steel bar stacking gradation; other P values correspond to the probability of the steel bar stacking gradation one by one;

[0100] S5, calculate the cumulative stacking gap area of the steel bar stacking gradation;

[0101] In this step, for the stacking gradation of three kinds of steel bars, the cumulative stacking gap area calculation formula is as follows:

[0102]

[0103] wherein, ΣPS T3 represents the cumulative stacking gap area of three kinds of steel bars, S 333 represents the area of the triangle surrounded by 333 stacking mode;

[0104] For the stacking gradation of four kinds of steel bars, the cumulative stacking gap area calculation formula is as follows:

[0105]

[0106] wherein, ΣPS T4 represents the cumulative stacking gap area of four kinds of steel bars; S 444 represents the area of the triangle surrounded by 444 stacking mode;

[0107] For the stacking gradation of five kinds of steel bars, the cumulative stacking gap area calculation formula is as follows:

[0108]

[0109] wherein, ΣPS T5 represents the cumulative stacking gap area of five kinds of steel bars; S 555 represents the area of the triangle surrounded by 555 stacking mode. As shown in Tables 1-7:

[0110] Table 1 Φ75 Φ65 Φ50 three bar gradation

[0111] Gradation a, mm b, mm c, mm s = (a + b + c) / 2, mm

[00006] S T3 , mm 2 ]]> P PS T3 , mm 2 ]]> 111 75 75 75 112.5 2435.70 0.77％ 18.75 112 70 70 75 107.5 2216.55 4.17％ 92.43 113 62.5 62.5 75 100 1875.00 5.29％ 99.19 221 70 70 65 102.5 2014.93 7.43％ 149.71 222 65 65 65 97.5 1829.48 4.36％ 79.77 223 57.5 57.5 65 90 1541.61 16.77％ 258.53 331 62.5 62.5 50 87.5 1432.05 11.99％ 171.70 332 57.5 57.5 50 82.5 1294.52 21.31％ 275.86 333 50 50 50 75 1082.53 8.95％ 96.89 123 57.5 62.5 70 95 1701.33 18.96％ 322.57 ΣS T P]]> 1565.40

[0112] Table 2 Φ73 Φ63 Φ48 three-rod gradation

[0113] Gradation a, mm b, mm c, mm s = (a + b + c) / 2, mm <![CDATA[S T3 ,mm 2 ]]> P PS T3 , mm 2 ]]> 111 75 75 75 112.5 2435.70 0.77％ 18.75 112 70 70 75 107.5 2216.55 4.17％ 92.43 113 62.5 62.5 75 100 1875.00 5.29％ 99.19 221 70 70 65 102.5 2014.93 7.43％ 149.71 222 65 65 65 97.5 1829.48 4.36％ 79.77 223 57.5 57.5 65 90 1541.61 16.77％ 258.53 331 62.5 62.5 50 87.5 1432.05 11.99％ 171.70 332 57.5 57.5 50 82.5 1294.52 21.31％ 275.86 333 50 50 50 75 1082.53 8.95％ 96.89 123 57.5 62.5 70 95 1701.33 18.96％ 322.57 ΣS T P]]> 1565.40

[0114] Table 3 Φ75 Φ73 Φ63 Φ48 four-rod gradation

[0115]

[0116]

[0117] Table 4 Φ73 Φ65 Φ56 Φ43 four-rod gradation

[0118] Gradation a, mm b, mm c, mm s = (a + b + c) / 2, mm [SA T4 mm 2 ]]> P PS T4 , mm 2 ]]> 111 73 73 73 109.5 2307.52 0.003％ 0.07 112 69 69 73 105.5 2137.28 0.06％ 1.28 113 64.5 64.5 73 101 1941.03 0.10％ 1.94 114 58 58 73 94.5 1645.24 0.13％ 2.14 221 69 69 65 101.5 1978.17 0.35％ 6.92 222 65 65 65 97.5 1829.48 0.70％ 12.81 223 60.5 60.5 65 93 1658.46 3.78％ 62.69 224 54 54 65 86.5 1401.56 4.80％ 67.27 331 64.5 64.5 56 92.5 1626.95 1.11％ 18.06 332 60.5 60.5 56 88.5 1501.66 6.74％ 101.21 333 56 56 56 84 1357.93 3.96％ 53.77 334 49.5 49.5 56 77.5 1142.95 15.21％ 173.84 441 58 58 43 79.5 1158.16 1.80％ 20.85 442 54 54 43 75.5 1065.01 10.88％ 115.87 443 49.5 49.5 43 71 958.62 19.34％ 185.40 444 43 43 43 64.5 800.64 8.12％ 65.01 123 60.5 64.5 69 97 1794.95 1.26％ 22.62 124 54 58 69 90.5 1519.26 1.60％ 24.31 134 49.5 58 64.5 86 1374.66 2.84％ 39.04 234 49.5 54 60.5 82 1266.62 17.21％ 217.99 ΣS T P]]> 1019

[0119] Table 5 Φ75 Φ73 Φ65 Φ56 Φ43 five-rod gradation

[0120] Gradation a, mm b, mm c, mm s = (a + b + c) / 2, mm [SA T5 , mm 2 ]] P PS T5 , mm 2 ]] 111 75 75 75 112.5 2435.70 0.139％ 3.38 112 74 74 75 111.5 2392.30 0.107％ 2.56 113 70 70 75 107.5 2216.55 0.646％ 14.33 114 65.5 65.5 75 103 2013.86 1.149％ 23.13 115 59 59 75 96.5 1708.10 1.458％ 24.91 221 74 74 73 110.5 2349.58 0.026％ 0.60 222 73 73 73 109.5 2307.52 0.002％ 0.04 223 69 69 73 105.5 2137.28 0.039％ 0.83 224 64.5 64.5 73 101 1941.03 0.069％ 1.34 225 58 58 73 94.5 1645.24 0.088％ 1.44 331 70 70 65 102.5 2014.93 0.982％ 19.79 332 69 69 65 101.5 1978.17 0.245％ 4.86 333 65 65 65 97.5 1829.48 0.487％ 8.91 334 60.5 60.5 65 93 1658.46 2.639％ 43.77 335 54 54 65 86.5 1401.56 3.351％ 46.96 441 65.5 65.5 56 93.5 1657.98 3.111％ 51.59 442 64.5 64.5 56 92.5 1626.95 0.778％ 12.66 443 60.5 60.5 56 88.5 1501.66 4.706％ 70.67 444 56 56 56 84 1357.93 2.761％ 37.50 445 49.5 49.5 56 77.5 1142.95 10.618％ 121.36 551 59 59 43 80.5 1181.28 5.022％ 59.32 552 58 58 43 79.5 1158.16 1.255％ 14.54 553 54 54 43 75.5 1065.01 7.595％ 80.89 554 49.5 49.5 43 71 958.62 13.496％ 129.37 555 43 43 43 64.5 800.64 5.670％ 45.40 123 69 70 74 106.5 2176.60 0.327％ 7.12 124 64.5 65.5 74 102 1977.16 0.582％ 11.50 125 58 59 74 95.5 1676.42 0.738％ 12.38 134 60.5 65.5 70 98 1828.73 3.519％ 64.35 135 54 59 70 91.5 1548.41 4.468％ 69.18 145 49.5 59 65.5 87 1401.44 7.939％ 111.25 234 60.5 64.5 69 97 1794.95 0.880％ 15.79 235 54 58 69 90.5 1519.26 1.117％ 16.97 245 49.5 58 64.5 86 1374.66 1.985％ 27.32 345 49.5 54 60.5 82 1266.62 12.007％ 152.08 ΣS T P]]> 1069

[0121] Table 6 Technical parameter table of MBS3858 rod mill

[0122]

[0123] Table 7 Parameter table of various steel rod gradation

[0124] Φ75 Φ73 Φ65 Φ63 Φ56 Φ50 Φ48 Φ43 Total number of steel bars Three bar gradation: initial state 121 215 273 0 609 Three bar gradation: light wear state 121 215 273 609 Four bar gradation: first replenishment state 20 121 215 273 629 Four bar gradation: severe wear state 20 121 215 273 629 Five bar gradation: second replenishment state 80 20 121 215 273 709

[0125] Therefore, the application adopts the above-mentioned method for adjusting the steel rod gradation of an industrial rod mill, which establishes a quantitative adjustment model by constructing a steel rod accumulation mode and calculating relevant parameters, replaces the traditional experience-based rod adjustment method, and makes the gradation more reliable. Meanwhile, the influence of the steel rod gradation on the coal water slurry forming characteristics is clear, the gradation state can be monitored in real time, the supplement parameters can be calculated, the steel rod gradation can be effectively optimized, the grinding efficiency of the rod mill is improved, and the coal water slurry particle size distribution and the slurry forming quality are improved.

[0126] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application rather than limiting them, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can still be modified or replaced by equivalents, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A method of sizing the steel rod gradation of an industrial rod mill, characterized in that, The method comprises the following steps: S1, according to the type, proportion, total weight, single steel rod weight, steel rod proportion and steel rod diameter of the steel rods in the rod mill, the number of various steel rods is calculated; S2, according to the type and number of the steel rods filled in the rod mill, the mode of the steel rods forming a stable stack is determined; S3, according to the mode of the stack in S2, calculate the stacking force area S T The calculation formula is as follows: a = R C + R B , b = R C + R A , c = R A + R B ; wherein s represents an intermediate calculation amount; a represents the sum of the radii of the steel bar C and the steel bar B; b represents the sum of the radii of the steel bar C and the steel bar A; c represents the sum of the radii of the steel bar A and the steel bar B; R A represents the radius of the steel bar A; R B represents the radius of the steel bar B; R C represents the radius of the steel bar C; S4, according to the total number of the steel rods and the number of various steel rods, the probability of the stacking mode of the three, four and five steel rods is calculated respectively; S5, according to the stacking stress area in S3 and the probability of the stacking mode in S4, the cumulative stacking gap area of the steel rod stacking gradation is calculated.

2. A method of sizing the steel rods of an industrial rod mill according to claim 1, characterized in that, In S3, the stacking stress area is a triangular area formed by connecting the centers of the cross sections of the three steel rods.

3. A method of sizing the steel rods of an industrial rod mill according to claim 2, characterized in that, In S4, the probability calculation formula of the three steel rod stacking gradation is: Wherein, The probability calculation expansion formula of the other 7 stacking modes is expanded in the same way, and is not listed one by one; Wherein, N=N1+N2+N3; P = P 111 + P 112 + P 113 + P 123 + P 221 + P 222 + P 223 + P 331 + P 332 + P 333 = 1; Wherein, N represents the total number of steel rods in the rod mill, N1, N2, N3 respectively represent the number of steel rods corresponding to the three kinds of steel rods; P 111 represents the probability of the occurrence of the 111 steel rod stack grading in the steel rod stack grading; other P values correspond one by one to the probabilities of the steel rod stack grading.

4. A method of sizing the steel rods of an industrial rod mill according to claim 3, characterized in that, In S4, the probability calculation formula of the four steel rod stacking gradation is: Wherein, The probability calculation expansion formula of the other 17 stacking modes is expanded in the same way, and is not listed one by one; Wherein, N=N1+N2+N3+N4; Wherein, N1, N2, N3, N4 respectively represent the number of steel bars corresponding to the four kinds of steel bars; P 444 represents the probability of the occurrence of the 444 steel bar stack grading in the steel bar stack grading.

5. A method of sizing the steel rods of an industrial rod mill according to claim 4, characterized in that, In S4, the probability calculation formula of the five steel rod stacking gradation is: Wherein, The probability calculation expansion formula of the other 32 stacking modes is expanded in the same way, and is not listed one by one; Wherein, N=N1+N2+N3+N4+N5; Wherein, N1, N2, N3, N4, N5 respectively represent the number of steel bars corresponding to five kinds of steel bars; P 555 represents the probability of the occurrence of 555 steel bar stacking grading in the steel bar stacking grading.

6. A method of sizing the steel rods of an industrial rod mill according to claim 5, characterized in that, In S5, the cumulative stacking gap area calculation formula of the three steel rod stacking gradation is: wherein ∑PS T3 represents the cumulative stacking gap area of the three steel bars, S 333 represents the triangular area formed by the 333 stacking method.

7. A method of sizing the steel rods of an industrial rod mill according to claim 6, characterized in that, In S5, the cumulative stacking gap area calculation formula of the four steel rod stacking gradation is: wherein∑PS T4 represents the cumulative stacking gap area of the four steel bars; S 444 represents the area of the triangle formed by the 444 stacking mode.

8. A method of sizing the steel rods of an industrial rod mill according to claim 7, characterized in that, In S5, the cumulative stacking gap area calculation formula of the five steel rod stacking gradation is: wherein∑PS T5 represents the cumulative stacking gap area of the five steel bars; S 555 represents the area of the triangle formed by the 555 stacking method.

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