DTII(A)带式输送机计算书Ver1.57蓝天(95版,20140109)

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,,设备位号,,DTII(A)例题1,,,设备名称,,,输煤带式输送机,,,,,,,

,,,已知设计参数,,,,,,,,显示提示：,输入或选取,,计算结果,,重要结果,

,,,,带宽(mm)B=,1000,,,机长(水平)(m)Lh=,127.293,,,,,,托辊直径(mm)dG=,133,

,,,,带速(m/s)v=,2,,,头部水平机长(m)L1=,0,,,,,,尾部水平机长(m)L2=,0,

,,,,设计输送量(t/h)Q=,600,,,提升高度(m)H=,7.3,,,,,,初选胶带规格=,NN-100,

,,,,物料最大粒度(mm)a=,300,,,倾斜角度(°)δ=,3.2822,,,,,,初选胶带层数Z=,4,

,,,,物料堆积密度(kg/m3)ρ=,900,,,托辊槽角(°)λ=,35,,,,,,胶带上下覆盖胶厚度（mm）qB2+qB3=,6,

,,,,,,,,,,,,,,,,,,

,,,带宽(m)Bm=,1,WIDTH,DIA,Mn,Rf,带宽mm,辊长mm,承载能力N,轴承,,,,,

,,,胶带类型Bt=,NN,1000,630,>=5.7,>=40.2,500,200,2110,6204/C4,,,,,

,,,倾斜角度(RAD)δ=,0.057285263,设备代号,,10063.2,,650,250,2470,6204/C4,,,,,

,,,重力加速度g=,9.81,传动滚筒计算,,,,800,315,2460,6305/C4,,,,,

,,改向滚筒计算,,,,,,,1000,380,4380,6305/C4,,,,,

,,No,RF,合力,惯量,质量,头增,,1200,465,3420,6305/C4,,,,,

,,1000315,>=5.7,11,1.8,221,,,1400,530,2920,6305/C4,,,,,

,,No,RF,合力,惯量,质量,尾增,,500,600,2070,6204/C4,,,,,

,,1000315,>=4.5,11,1.8,221,,,1200,700,,,,,,,

,,No,RF,合力,惯量,质量,垂改,,650,750,2000,6204/C4,,,,,

,,1000500,>=21.5,35,9.8,500,,,2200,800,,,,,,,

,,No,RF,合力,惯量,质量,垂拉,,800,950,1480,6305/C4,,,,,

,,1000630,>=23.5,43,26.5,567,,,1000,1150,1120,6305/C4,,,,,

,,No,RF,合力,惯量,质量,尾轮,,1200,1400,850,6305/C4,,,,,

,,1000630,>=27.3,43,26.5,567,,,1400,1600,690,6305/C4,,,,,

,,,,,,,,,,,,,,,,,,

,,一、核算输送能力,,,,,,,,,,,,,,,

,,,,,,,,物料的运行堆积角(°)θ=,20,,查表2-1,,,,,,

,,,,,,,,输送带装载物料的可用宽度（m）b=,0.85,,查表3-11,,,,,,

,,,,,,,,承载托辊组中间辊的长度（m）l3=,0.38,,查表3-11,,,,,,

,,,,,,,,物料的上部横截面面积（m2）S1=[l3+(b-l3)cosλ]2tgθ/6=,0.0355,,,,,,,,

,,,,,,,,下部横截面面积（m2）S2=[l3+0.5(b-l3)cosλ][0.5(b-l3)sinλ]=,0.0772,,,,,,,,

,,,,,,,,输送带上物料的最大截面积(m2)S=S1+S2=,0.1127,,查表3-2,,,,,,

,,,,,,,,S1的减少系数k1=√[(cos2δ-cos2θ)/(1-cos2θ)]=,0.9859,,,,,,,,

,,,,,,,,倾斜输送机面积折算系数k=1-S1(1-k1)/S=,0.9956,,,,,,,,

,,,,,,,,倾斜输送机面积折算系数k=,0.9950,,取k=,0.995,,FALSE,,,查表3-3

,,,,,,,,理论质量输送量(t/h)Q=3.6Svkρ=,726.44,,">600t/h,满足要求！",,,,,,

,,,,,,,,,,,,,,,,,,

,,二、根据物料粒度核算输送机带宽,,,,,,,,,,,,,,,

,,,,,,,,带宽B=2a+200=,800,,"<1000mm,满足要求！",,,,,,

,,三、计算圆周驱动力,,,,,,,,,,,,,,,

,,1、主要阻力FH(N),,,,,,模拟摩擦系数f=,0.03,,查表3-6,,,,回程分支托辊形式：,平形托辊,

,,,,,,,,承载分支每组托辊旋转部分质量(kg)G1=,18.90,,查表3-7,,,,,,

,,,,,,,,回程分支每组托辊旋转部分质量(kg)G2=,16.09,,,,,,,,

,,,,,,,,承载分支每米长度旋转部分重量(kg/m)qRO=G1/a0=,15.75,,,,,,,承载分支托辊间距(m)a0=,1.2

,,,,,,,,回程分支每米长度旋转部分重量(kg/m)qRU=G2/aU=,5.36,,,,,,,回程分支托辊间距(m)aU=,3

,,,,,,,,每米长度输送物料重量(kg/m)qG=Q/(3.6v)=,83.33,,,,,,,,

,,,,,,,,每米长度输送带质量(kg/m)qB=,10.92,,查表4-2计算或查表4-5,,,,钢丝绳芯带:qB=qB2•B,,

,,,,,,,,输送机长度近似值（m）L≈,127.502,,,,织物芯带:qB=[ZqB1+1.14(dB2+dB3)]B,,,,

,,FH=fg(L1+L2)(qRO+qRU+2qB+qG)+fg(L-L1-L2)[qRO+qRU+(2qB+qG)cosδ],,,,,,,,,,,,,,,

,,,,,,,,FH=,4732,,,,,,,,

,,2.附加阻力FN(N),,,,,,,,,,,,,,,

,,1）在加料点和加速段被输送物料与输送带间的惯性和摩擦阻力FbA(N),,,,,,,,,,,,,,,

,,,,,,,,设计体积输送量（m3/s)Iv=Q/(3.6ρ)=,0.1852,,,,,,,,

,,,,,,,,FbA=Ivρ(v-vo)=,333.33,,,,,,,物料在输送方向上的分量（m/s）V0=,0

,,2)在加速段被输送物料和导料栏板的摩擦阻力Ff(N),,,,,,,,,,,,,,,

,,,,,,,,物料与输送带间的摩擦系数μ1=,0.6,,,,,,,一般取μ1=0.5~0.7,

,,,,,,,,物料与导料栏板间的摩擦系数μ2=,0.7,,,,,,,一般取μ2=0.5~0.7,

,,,,,,,,导料槽两栏板间宽度(m)bl=,0.61,,查表3-11,,,,,,

,,,,,,,,"加速段长度（m)lb>lb,min=(v2-vo2)/(2gμ1)=",0.34,,,,,,,,

,,,,,,,,Ff=μ2•Iv2•ρ•g•lb/{[(v+v0)/2]2•bl2}=,193.54,,,,,,,,

,,3)胶带绕过滚筒缠绕阻力F1(N),,,,,,∑Fl=,351.7,,见表0：各特性点张力和滚筒参数中F1的合计值。,,,,,,

,,4)非传动滚筒的轴承阻力Ft(N),,,,,,∑Ft=,143.6,,见表0：各特性点张力和滚筒参数中Ft的合计值。,,,,,,

,,,,,,,,FN=FbA+Ff+F1+Ft=,1022.14,,,,,,,,

,,,,,,,,附加阻力系数C=,1.670,,查表3-5,,,,,,

,,,,,,,,FN=(C-1)FH=,3170.60,,,,,,,,

,,,,,,,,取FN=,3170.60,,,,,,FALSE,,

,,3、主要特种阻力FS1(N),,,,,,,,,,,,,,,

,,1）托辊前倾的摩擦阻力Fε(N),,,,,,槽形系数Cε=,0.43,,,,,,,,"槽角λ=(30o,35o,45o),Cε=(0.4,0.43,0.5)"

,,,,,,,,托辊和输送带间的摩擦系数μ0=,0.3,,,,,,,,一般取μ0=0.3~0.4

,,,,,,,,装有前倾承载托辊的输送机长度(m)Lε=,127.502,,全部前倾,,,,,,

,,,,,,,,托辊前倾角度(°)ε=,1.38,,查表3-7，带宽B>1400mm时，用户自行填写表1-1右侧表,,,,,,

,,,,,,,,承载托辊：Fε=Cε•μ0•Lε•(qB+qG)•g•cosδ•sinε=,367,,,,,,,,

,,,,,,,,装有前倾回程托辊的输送机长度(m)Lε=,0.000,,无前倾,,,,,,

,,,,,,,,回程托辊：Fε=μ0•Lε•qB•g•cosλ•cosδ•sinε=,0,,,,,式中：ε=,1.5,λ=,10

,,2）导料栏板间的摩擦阻力Fgl(N),,,,,,,,,,,,,,,

,,,,,,,,导料槽栏板长度(m)l=,4,,,,,,,"导料槽最小长度(m）lmin=MAX(1.2v,1.5)=",2.4

,,,,,,,,Fgl=μ2•Iv2•ρ•g•l/(v2•b12)=,570,,,,,,,,

,,,,,,,,Fs1=Fε+Fgl=,936,,,,,,,,

,,4、附加特种阻力FS2(N),,,,,,,,,,,,,,,

,,1）清扫器摩擦阻力Fr(N),,,,,,,,,,,,,,,

,,,,,,,,头部清扫器和输送带接触面积(m2)AO=,0.01,,查表3-11,,,,,头部清扫器个数n3O=,2

,,,,,,,,空段清扫器和输送带接触面积(m2)AU=,0.015,,查表3-11,,,,,空段清扫器个数n3U=,2

,,,,,,,,清扫器和输送带间的压力((N/m2)p=,100000,,,,一般取p=(3~10)x104,,,,

,,,,,,,,清扫器和输送带间的摩擦系数μ3=,0.6,,,,一般取μ3=0.5~0.7,,,,

,,,,,,,,头部清扫器摩擦阻力FrO=AO•p•μ3=,600,,,,,,,,

,,,,,,,,空段清扫器摩擦阻力FrU=AU•p•μ3=,900,,,,,,,,

,,,,,,,,Fr=n3O•FrO+n3U•FrU=,3000,,,,,,,,

,,2）犁式卸料器摩擦阻力Fp(N),,,,,,刮板系数(N/m)kp=,1500,,,,,,,,宜取kp=1500N/m

,,,,,,,,同时工作的犁式卸料器个数n4=,0,,,,,,,,建议犁式卸料器个数最大按3个同时工作考虑！

,,,,,,,,Fp=n4•B•kp=,0,,,,,,,,

,,3）卸料车阻力FAW(N),,,,,,单台卸料车阻力Fb=,0,,,,,,,卸料车个数nAW=,0

,,,,,,,,FAW=nAW*Fb=,0,,,,,,卸料车类型：,移动式,

,,,,,,,,附加特种阻力(N)Fs2=Fr+Fp+FAW=,3000,,,,,,,,

,,5、倾斜阻力FSt(N),,,,,,FSt=qG•g•H=,5968,,,,,,,,

,,6、圆周驱动力Fu(N),,,,,,Fu=FH+FN+FS1+FS2+FSt=,17807,,,,,,,,

,,,,,,,,,,,,,,,,,,

,,四、传动滚筒轴功率和电机功率计算,,,,,,,,,,,,,,,

,,,,,,,,稳定运行时传动滚筒轴功率(kW)PA=Fu•v/1000=,35.61,,,,,,,,

,,,,,,,,传动效率η=,0.88,,,,,,,,一般取η=0.85~0.95

,,,,,,,,电压降系η′=,1,,,,,,,,一般取1，只在特殊情况下η'=0.9~0.95

,,,,,,,,"多电机驱动不平衡系数η""=",1,,,,,,,,"一般取η""=0.9~0.95(单电机为1)"

,,,,,,,,"电动机功率(kW)PM=PA/(ηη′η"")=",40.47,,,,,,,,

,,,,,,,,计算功率(kW)得P=k•PM=,40.47,,,,,,,功率备用系数k=,1

,,,,,,,,选取电动机功率(kW)PM1=,45.00,,,,,,,电机个数nD=,1

,,,电机型号：,Y225M-4,,,,电动机质量(kg)：,333,,电机转速(rpm)：,,1480,电机电压(V)：,,380,

,,,,,,,,所需减速机速比i=,24.410,,,,,,减速机公称速比i=,25.0,

,,五、张力计算,,,,,,,,,,,,,,,

,,1、输送带不打滑条件校核,,,,,,,,,,,,,,,

,,1)启动工况,,,,,,启动系数ka=,1.5,,中小型输送机可取启动系数ka=1.3~1.7,,,,,,

,,,,,,,,启动工况传动滚筒圆周力(N)Fua=ka•Fu=,26710,,,,,,,,

,,,,,,,,输送带在传动滚筒绕出点的保证最小张力F2min(N),,,,,,,输送带在传动滚筒上的围包角φ=,200,

,,,,,,,,F2min≥Fua/(eμφ-1)=,11162,,,,,,传动滚筒与输送带间的摩擦系数μ=,0.35,

,,2)稳定运行工况,,,,,,,,,,,,,欧拉系数eμφ=,3.39,

,,,,,,,,输送带在传动滚筒绕出点的保证最小张力F2min(N),,,,,,,,,

,,,,,,,,F2min≥Fu/(eμφ-1)=,7441,,,,,,,,

,,2、输送带下垂度校核,,,,,,,,,,,,,,,

,,1)承载分支最小张力(N),,,,,,FROmin≥a0(qB+qG)g/(8hmax)=,13869,,,,,,允许最大下垂度hmax=,0.01,

,,2)回程分支最小张力(N),,,,,,FＲＵmin≥aU•qB•g/(8hmax)=,4017,,"一般hmax应限制在0.01～0.02,稳定运行工况，宜取0.01。",,,,,,

,,3、传动滚筒的选择,,,,,,,,,,,,,,,

,,1)传动滚筒的直径（mm),,,,,织物芯层厚度（mm）,dB=,2.80,,查表4-2~4-5,,,,,,

,,,,,,,,传动滚筒最小直径（mm)D=C0dB=,252,,"CC带：Co=80,NN带:Co=90,EP带:Co=108,ST带:Co=145",,,,,,

,,2)传动滚筒合力Fn(kN)（传动滚筒的选择原则按下表1的注3；或参见按GB50431的9.1.3条）,,,,,,,,,,,,,,FALSE,

,,,,,,,,启动工况:Fna=（Fua+2F2a）/1000=,49.0,,,,,,取F2min和FRUmin较大者，令启动工况：F2a=,11162,

,,,,,,,,稳定运行工况:Fn=（Fu+2F2a）/1000=,40.1,,,自动拉紧:Fn=,35.6,,令稳定工况：F2=,8914,

,,,,,,,,初选直径(mm)D=,630,,,,,,传动滚筒转速（rpm）nT=60v/(πD)=,60.63,

,,,,,,,,输送机代号:,10063.2,,"查表6-1,见本计算书表1-2",,,,,,

,,,,,,,,许用合力(kN)=,73,,">40.13,合格！",,,,,,

,,3)传动滚筒扭矩（kN•m）,,,,,,,,,,,,,,,

,,,,,,,,启动工况：Mamax＝Fua•D/（2000*1000）=,8.4,,,,,,,,

,,,,,,,,稳定运行工况:Mmax＝Fu•D/（2000*1000）=,5.6,,,,,,,,

,,,,,,,,许用扭矩(kN•m)=,12,,">5.61,合格！",,,,,,

,,4)传动滚筒的直径(mm)的面压验算：,,,,,,,,,,,,,,,

,,,按输送带许用比压验算：,,,,,D≥(F1+F2)/([P]•B)=,122.58,,"<630,合格！",,,,,,

,,,,,,,,,,,,,,,,,

,,4、拉紧装置计算,,,,,,,,,,,,,,,

,,,,,,,,垂直拉紧装置与头轮水平距离(m)L′=,30.45,,若不是中部垂直拉紧装置输入L'=0！,,,,,,

,,,,,,,,拉紧滚筒和拉紧装置质量之和(kg)Gk=,1119.7,,"查表6-30,6-31,6-2",,,,,,

,,1)拉紧力FSP(N),,,,启动工况：,,Fsp=F7a+F8a=,28298,,(供重锤和车式拉紧用或自动拉紧装置启动工况用。),,,,,,

,,,,,,稳定工况：,,Fsp=F7+F8=,23482,,(供自动拉紧装置运行工况用。),,,,,,

,,,,,,,,静止状态下预拉紧力：FTm=1/L∑(Fi+Fi+1)Li~i+1/2=,40777,,(供固定式拉紧装置用。),,,,,,

,,2)重锤质量G(kg),,,,,,G=FSP/g-Gk=,1765,,,,,,,,

,,3)拉紧装置的拉紧行程(m),,,,,,lSP≥(ε0+ε1)L+lN=,3.86,,数据按GB50431-2008推荐值中间值计算！,,,,,,

,,5、凹凸弧段及槽形过渡段尺寸计算,,,,,,,,,,,,,,,

,,1)凸弧段半径R1(m),,,,,,织物带:R1≥(38~42)Bsinλ=,0.00,,,,,,,取R1=,0

,,2)凹弧段半径计算R2(m),,,,,,带式输送机动载系数kd=,1.20,,一般取kd=1.2~1.5,,,,,,

,,,,,,,,R2≥（kdFx/(qBgcosδ)=,0.00,,,式中：Fx(F15)=,14993,,,取R2=,0

,,3)槽形过渡段最小长度A(mm),,,,,,,,,,,,,,,

,,,,,,,,"头部:(45度槽角,织物带)A=k'B=",1600,,左侧计算数据是为了保证输送带在特定槽角下输送带中心不被压缩和边缘不过张力所需的槽形过渡段最小长度。供设计过渡托辊槽角和位置时参考。(见GB50431表11.4。1-2),,,,,式中：k'=,1.6

,,,,,,,,"(35度槽角,织物带)A=k'B=",1300,,,,,,,式中：k'=,1.3

,,,,,,,,"(20度槽角,织物带)A=k'B=",800,,,,,,,式中：k'=,0.8

,,,,,,,,"尾部:(45度槽角,织物带)A=k'B=",1300,,,,,,,式中：k'=,1.3

,,,,,,,,"(35度槽角,织物带)A=k'B=",1000,,,,,,,式中：k'=,1.0

,,,,,,,,"(20度槽角,织物带)A=k'B=",600,,,,,,,式中：k'=,0.6

,,6、各特性点张力和滚筒参数,,,,,,,,,,,,,,FALSE,

,,表0：各特性点张力和滚筒参数,,,,,,,,,,,,,,,

,i,"K'

改向阻力系数","n3

清扫器个数","稳定运行工况F(i)

N","启动工况F(i)a

N",张力点说明,,,滚筒d0(mm),滚筒直径D(mm),稳定工况滚筒合力FT（kN）,启动工况滚筒合力FT（kN）,滚筒许用合力（kN）,滚筒质量（kg）,滚筒转动惯量J(i)kg.m2,滚筒轴承阻力Ft（N）,胶带绕过滚筒缠绕阻力Fl(N)

,2,,,8914,11162,头轮绕出点,,,120,630,40.1,49.0,73,823,38.3,不计入,42.8

,3,,2,10114,12362,头部增面轮,,绕入点,80,315,5.7,6.5,11,221,1.8,8.2,66.6

,4,1.02,,10317,12609,,,绕出点,,,,,,,,,

,5,,1,11176,13468,垂直拉紧装置,奔入滚筒,绕入点,120,500,19.3,22.5,35,500,10,27.0,43.8

,6,1.03,,11511,13872,,,绕出点,,,,,,,,,

,7,,,11511,13872,,张拉紧滚筒,绕入点,160,630,23.5,28.3,43,567,27,35.9,35.4

,8,1.04,,11971,14427,,,绕出点,,,,,,,,,

,9,,,11971,14427,,奔离滚筒,绕入点,120,500,21.5,25.0,35,500,10,30.1,45.4

,10,1.03,,12330,14859,,,绕出点,,,,,,,,,

,11,,1,13100,15629,尾部改向滚筒,,绕入点,80,315,4.5,4.9,11,221,1.8,6.3,74.9

,12,1.02,,13362,15941,,,绕出点,,,,,,,,,

,13,,,13362,15941,尾轮,,绕入点,140,630,27.3,32.5,43,567,27,36.1,42.8

,14,1.04,,13896,16579,,,绕出点,,,,,,,,,

,15,,,14993,17675,承载段凹弧段奔入点,,,合计,,,,,,114.5,143.6,351.7

,注：1、表中非传动滚筒的轴承阻力按公式Ft=0.005do/D•FT（N）计算。,,,,,,,,,,,,,,,,

,2、表中胶带绕过滚筒缠绕阻力按公式:各种帆布带F1=9B(140+0.01F/B)d/D和钢丝芯带F1=12B(200+0.01F/B)d/D,,,,,,,,,,,,,,,,

,3、表中的改向滚筒质量和转动惯量取的是光面和胶面滚筒两者的最大值。表中所确定的滚筒规格仅供计算用。用户应根据表中计算的滚筒合力值和注4的原则，查手册的表6.2改向滚筒及相关表格最终确定。当带宽B>1400mm时，需用户填写表6.2滚筒数据。,,,,,,,,,,,,,,,,

,4、按GB50431的9.1.3的要求，传动滚筒可按稳定工况的扭矩和合力选取;改向滚筒可按稳定工况的合力选取。对于大运量（≥3000t/h）、提升高度大和重要的大张力带式输送机应按最不利工况选择传动滚筒和改向滚筒。,,,,,,,,,,,,,,,,

,,"启动工况：F14a=16580>FROmin=13870N,满足垂度要求！",,,,,,,,,,,,,启动工况：F2a调整系数kF2a=,1.000,

,,"稳定工况：F14=13897>FROmin=13870N,满足垂度要求！",,,,,,,,,,,,,稳定运行工况：F2调整系数kF2=,1.198,

,,,,,,,,,,,,,,,,,,

,,六、逆止力的计算（按GB50431计算）,,,,,,,,,,,,,,,

,,,,,,,,逆止力（N）FL=FSt-FH=,3759,,,,,,模拟摩擦系数f(取值：0.012~0.016)=,0.014,

,,,,,,,,逆止力矩（kN.m）ML=FL•D/2000=,1.18,,,,,,逆止器工况系数k2(取值：1.5~2)=,2.0,

,,,,,,,,逆止器需要的逆止力矩（kN.m）M=k2ML=,2.37,,需设置逆止器！,,,,,,

,发生逆转的向上输送的带式输送机应装设制动器或逆止器，发生逆转的向上输送的大型带式输送机应同时装设制动器和逆止器。,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,

,,七、输送带选择计算,,,,,,,,,,,,,,,

,,1、织物输送带层数Z,,,,,,,,,,,,,,,

,,,,,,,,稳定工况下输送带最大张力（N)Fmax=Fu+F2=,28968,,,,,,,输送带额定拉断强度（N/mm）σN=,100

,,,,,,,,输送带静安全系数SA=,12,,"CC带：SA=8~9,NN、EP带:SA=10~12,ST带：SA=7~9",,,,,,

,,织物带层数（N/mm)Z≥Fmax•SA/（B•σN）=,,,,,,,3.48,,带层数Z=4合格！,,,,,,

,,,,,,,,输送带厚度（mm)d=,8.8,,查表（4-2~4-5),,,,,,

,,,,,,,,,选定胶带规格：1000NN44004.5+1.5L,,,,,,,,

,,2、输送带几何长度Lz(m),,,,,,,,,,,,,,,

,,,凸弧段长(m)Lconv=δ•R1•π/180=,,,,,,0.000,,,,,,,式中：凸弧段半径R1=,0.0

,,,,,,,,凹弧段长(m)Lconc=δ•R2•π/180=,0.000,,,,,,,凹弧段半径R2=,0.0

,,,,,,,,输送机长度（m）L=,127.502,,,,,,,头轮直径D1=,0.63

,,,,,,,,"垂直拉紧装置安装附加长度（m）L""=",4.50,,,,,,,尾轮直径D2=,0.63

,,,,,,,,卸料车或斗轮机所需附加长度（m）Ltrp=,0.00,,,,,,,,

,,"输送带几何长度(m)Lz＝π•（D1＋D2)/2+2•L+L""+Ltrp=",,,,,,,261.48,,,,,,,,

,,3、输送带接头长度Lu(m),,,,接头数N=Lz/ls=,,,1,,,,,,,单根输送带长度Ls=,300

,,1)按手册公式计算：,,,,,,最小阶梯宽度b'=,400,,查表3-22,,,,,,

,,织物芯带(m)：Lu＝（（Z-1）•b′+B•tg30°）/1000=,,,,,,,1.78,,,,,,,,

,,,,钢丝绳破断强度（N/根）Ps=,,,,,15000,,,,,,,,一般取Ps=15000

,,,,,,接头系数K=,,,1.50,,,,,,,,一般取K=1.3~1.5

,,,,抽出力（N/mm）Fc=,,,,,,,查表3-21,,,,,,

,,,,搭接长度（mm）l′=Ps•K/Fc=,,,,,,,,,,,,,

,,钢绳芯带(m)：Lu=（3•l'+250）/1000=,,,,,,,,,,,,,,,

,,2)