1、3PE钢质管道防腐层

1.13PE防腐层(ceng)(ceng)(ceng)(ceng)(ceng)(ceng)介绍。钢管三层(ceng)(ceng)(ceng)(ceng)(ceng)(ceng)PE防腐，其主(zhu)要结(jie)构为(wei)：底(di)层(ceng)(ceng)(ceng)(ceng)(ceng)(ceng)环氧粉末(mo)层(ceng)(ceng)(ceng)(ceng)(ceng)(ceng)、中(zhong)间胶粘剂(ji)层(ceng)(ceng)(ceng)(ceng)(ceng)(ceng)、外层(ceng)(ceng)(ceng)(ceng)(ceng)(ceng)聚乙烯(xi)(xi)防腐层(ceng)(ceng)(ceng)(ceng)(ceng)(ceng)。3PE涂层(ceng)(ceng)(ceng)(ceng)(ceng)(ceng)的(de)性能主(zhu)要是(shi)将底(di)层(ceng)(ceng)(ceng)(ceng)(ceng)(ceng)环氧粉末(mo)、中(zhong)间层(ceng)(ceng)(ceng)(ceng)(ceng)(ceng)粘接剂(ji)和外层(ceng)(ceng)(ceng)(ceng)(ceng)(ceng)聚乙烯(xi)(xi)有(you)(you)机地结(jie)合成了一(yi)个整体，从而使该涂层(ceng)(ceng)(ceng)(ceng)(ceng)(ceng)具有(you)(you)熔(rong)结(jie)环氧粉末(mo)涂层(ceng)(ceng)(ceng)(ceng)(ceng)(ceng)和聚乙烯(xi)(xi)涂层(ceng)(ceng)(ceng)(ceng)(ceng)(ceng)的(de)双(shuang)重优(you)点(dian)。

1.23PE防腐(fu)层的生产工艺介绍

2、3PE管端翘(qiao)边缺陷

3PE钢质(zhi)防腐(fu)(fu)管(guan)(guan)道翘(qiao)边现(xian)(xian)象(xiang)是(shi)指钢管(guan)(guan)进(jin)行3PE防腐(fu)(fu)后防腐(fu)(fu)层(ceng)(ceng)(ceng)(ceng)(ceng)与(yu)钢管(guan)(guan)表(biao)面分离的(de)(de)(de)现(xian)(xian)象(xiang)，往往发(fa)生(sheng)在钢管(guan)(guan)端(duan)部，是(shi)由于(yu)涂层(ceng)(ceng)(ceng)(ceng)(ceng)与(yu)钢材基体(ti)粘(zhan)结(jie)力降低(di)或缺失引起的(de)(de)(de)，具(ju)体(ti)表(biao)现(xian)(xian)形式如下(xia)：1)管(guan)(guan)端(duan)坡口(kou)处PE层(ceng)(ceng)(ceng)(ceng)(ceng)翘(qiao)起，而下(xia)部胶粘(zhan)剂层(ceng)(ceng)(ceng)(ceng)(ceng)及(ji)FBE层(ceng)(ceng)(ceng)(ceng)(ceng)完(wan)好力坡口(kou)PE层(ceng)(ceng)(ceng)(ceng)(ceng)翘(qiao)起且(qie)翘(qiao)起处无(wu)中(zhong)间胶粘(zhan)剂层(ceng)(ceng)(ceng)(ceng)(ceng)，PE层(ceng)(ceng)(ceng)(ceng)(ceng)与(yu)FBE层(ceng)(ceng)(ceng)(ceng)(ceng)呈现(xian)(xian)两层(ceng)(ceng)(ceng)(ceng)(ceng)皮现(xian)(xian)象(xiang)。3)坡口(kou)PE层(ceng)(ceng)(ceng)(ceng)(ceng)翘(qiao)起，下(xia)部无(wu)涂层(ceng)(ceng)(ceng)(ceng)(ceng)，在整个圆周方(fang)向形成一圈缝隙。中(zhong)管(guan)(guan)端(duan)防腐(fu)(fu)层(ceng)(ceng)(ceng)(ceng)(ceng)自底层(ceng)(ceng)(ceng)(ceng)(ceng)FBE处剥离，形成翘(qiao)边。3PE防腐(fu)(fu)管(guan)(guan)在露(lu)天存放过程(cheng)中(zhong)，因雨(yu)水、凝露(lu)等易(yi)在翘(qiao)边缝隙处进(jin)入并滞(zhi)留，从而形成局部腐(fu)(fu)蚀(shi)环境，导(dao)致(zhi)缝隙腐(fu)(fu)蚀(shi)，而腐(fu)(fu)蚀(shi)产物的(de)(de)(de)生(sheng)成又会加剧PE层(ceng)(ceng)(ceng)(ceng)(ceng)翘(qiao)起的(de)(de)(de)程(cheng)度。

3、管道涂(tu)覆工艺(yi)对管端翘(qiao)边的(de)影响因(yin)素及(ji)理论(lun)计算

防腐层(ceng)管端翘边实(shi)际(ji)上是(shi)防腐层(ceng)端部变(bian)形(xing)。材(cai)料变(bian)形(xing)均(jun)有应(ying)(ying)力作(zuo)用，防腐层(ceng)管端实(shi)际(ji)上是(shi)收(shou)缩(suo)残余(yu)应(ying)(ying)力作(zuo)用的应(ying)(ying)力集(ji)中(zhong)区域，周向(xiang)冷(leng)却(que)成型收(shou)缩(suo)残余(yu)应(ying)(ying)力是(shi)向(xiang)钢管侧收(shou)缩(suo)，有利于(yu)防腐层(ceng)粘(zhan)贴紧(jin)密。所以本(ben)文主要分析生产涂(tu)敷过程(cheng)中(zhong)工艺参数对其的影响。

3.1传(chuan)动(dong)(dong)轮偏(pian)转角度、钢管(guan)螺(luo)(luo)距(ju)的(de)理论计算(suan)。3PE防腐(fu)管(guan)作(zuo)业线通过(guo)(guo)调(diao)整(zheng)传(chuan)动(dong)(dong)轮两轮的(de)间距(ju)实现对不同管(guan)径(jing)钢管(guan)的(de)涂敷作(zuo)业。调(diao)整(zheng)传(chuan)动(dong)(dong)线过(guo)(guo)程(cheng)中，传(chuan)动(dong)(dong)轮偏(pian)转角度过(guo)(guo)大会导致钢管(guan)螺(luo)(luo)距(ju)变大，从而造成中间胶(jiao)豁(huo)剂层搭(da)接(jie)(jie)不上(shang)，使聚乙(yi)烯层与环氧粉末层直接(jie)(jie)搭(da)接(jie)(jie)，影响粘接(jie)(jie)强(qiang)度造成翘边。此(ci)类(lei)缺陷实际上(shang)是胶(jiao)豁(huo)剂层断胶(jiao)引发的(de)，断胶(jiao)的(de)原因是钢管(guan)螺(luo)(luo)距(ju)过(guo)(guo)大使胶(jiao)豁(huo)剂搭(da)接(jie)(jie)不上(shang)造成的(de)。对此(ci)，我们通过(guo)(guo)计算(suan)得出确保胶(jiao)茹剂搭(da)接(jie)(jie)的(de)钢管(guan)螺(luo)(luo)距(ju)及(ji)偏(pian)转角度。

传动轮偏转角(jiao)度是影(ying)响钢管螺距的主(zhu)要(yao)因素，为(wei)保证有适当(dang)的螺距保证有适当(dang)的偏转角(jiao)度。

3.2生产速(su)度(du)(du)的(de)理论计算。三层(ceng)PE成型(xing)对传(chuan)动(dong)速(su)度(du)(du)要求(qiu)非常严(yan)格，要求(qiu)在粉(fen)末(mo)胶(jiao)(jiao)化状态下完(wan)成中间粘结剂的(de)缠绕或包覆，粉(fen)末(mo)胶(jiao)(jiao)化的(de)时(shi)间比较短，钢管(guan)的(de)传(chuan)动(dong)速(su)度(du)(du)与粉(fen)末(mo)胶(jiao)(jiao)化时(shi)间匹配(pei)，钢管(guan)传(chuan)输速(su)度(du)(du)过快，会导致(zhi)粉(fen)末(mo)未(wei)充(chong)分胶(jiao)(jiao)化；过慢(man)则可能出现(xian)粉(fen)末(mo)己(ji)经固(gu)化，所以，生产线运行(xing)速(su)度(du)(du)也是影(ying)响管(guan)端翘(qiao)边缺陷的(de)主要原因之一。

通过上(shang)式可(ke)以(yi)知道，生(sheng)产(chan)线的速(su)(su)度(du)(du)(du)(du)取决于传(chuan)动(dong)轮偏转(zhuan)(zhuan)角度(du)(du)(du)(du)和(he)电机(ji)转(zhuan)(zhuan)速(su)(su)，生(sheng)产(chan)时(shi)传(chuan)动(dong)轮偏转(zhuan)(zhuan)角度(du)(du)(du)(du)与钢管(guan)外径有关，电机(ji)的转(zhuan)(zhuan)速(su)(su)由(you)变频(pin)器(qi)决定(ding)，所以(yi)生(sheng)产(chan)线速(su)(su)度(du)(du)(du)(du)就主要取决于变频(pin)器(qi)设(she)(she)置，生(sheng)产(chan)线的速(su)(su)度(du)(du)(du)(du)一方(fang)面(mian)不(bu)能(neng)超出(chu)现有设(she)(she)备的喷涂能(neng)力、挤出(chu)机(ji)挤出(chu)能(neng)力，另一方(fang)面(mian)还要保证在环氧粉末(mo)胶化过程(cheng)中进行(xing)胶豁剂涂敷(fu)。

通过分析生产环节中(zhong)各工艺(yi)参数的相(xiang)互(hu)联系，将涂敷工艺(yi)参数对管(guan)道翘边缺陷(xian)(xian)的影响由经验总(zong)结上升到理论计算(suan)，降低了3PE钢制管(guan)道管(guan)端(duan)翘边缺陷(xian)(xian)的形(xing)成，进(jin)一(yi)步(bu)提升生产管(guan)理和质(zhi)量控制的水(shui)平，避免了操作的盲(mang)目性(xing)和随意性(xing)。