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真空熔煉爐使用應注意的細節有哪些呢
發布時間:2020-12-24   瀏覽:7149次

  真空(kong)熔煉(lian)爐(lu)使用應注意的細(xi)節有哪些呢

  真空熔煉爐使用(yong)應注意的細節(jie)有哪些呢(ni)?今天小(xiao)編就(jiu)和大家介紹一下。

  1、真空熔煉爐的(de)升溫(wen),必須緩慢地用逐漸提(ti)高電壓的(de)辦法進行。注意不要超過安全溫(wen)度,以免燒毀電熱(re)絲。

  2、真空熔煉爐(lu)爐(lu)膛內(nei)不(bu)(bu)宜放(fang)(fang)入(ru)(ru)含有(you)酸、堿性之(zhi)化學品(pin)(pin)或(huo)強烈的氧化劑(ji),更不(bu)(bu)許在爐(lu)內(nei)灼燒有(you)爆(bao)炸危險的物品(pin)(pin)。將物料(liao)放(fang)(fang)入(ru)(ru)爐(lu)膛時,切勿碰及熱(re)電偶,因伸入(ru)(ru)爐(lu)膛內(nei)的熱(re)電偶熱(re)端(duan)在高溫(wen)下易于折(zhe)斷。

真空熔煉爐使用應注意的細節有哪些呢

  3、將金屬以(yi)及其它礦物放入真(zhen)空熔煉爐內加熱時(shi),必須(xu)置于(yu)耐(nai)高(gao)溫的瓷坍渦(wo)或瓷皿中(zhong),或墊以(yi)耐(nai)火泥板(ban)或石棉板(ban),防止(zhi)與爐膛粘連在一(yi)起。

  4、真空(kong)熔煉爐(lu)使(shi)用時(shi),勿使(shi)其受劇烈(lie)振動,因(yin)紅熱的爐(lu)絲極易脆斷。

  真空(kong)燒結爐廠(chang)家是國內較好的實(shi)驗(yan)電爐廠(chang)家之一,主要生(sheng)產和制造各種類型(xing)和型(xing)號的真空(kong)甩帶爐、真空(kong)熔煉爐等,如您有采購需要歡迎(ying)電話(hua)咨詢我們。

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真空熔煉爐日常使用注意事項

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  真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)熔(rong)(rong)煉(lian)(lian)爐(lu)(lu)(lu)(lu)日常(chang)(chang)使(shi)(shi)(shi)(shi)(shi)用(yong)(yong)(yong)注(zhu)(zhu)(zhu)(zhu)(zhu)(zhu)意(yi)事(shi)(shi)(shi)項(xiang)(xiang)(xiang)  真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)熔(rong)(rong)煉(lian)(lian)爐(lu)(lu)(lu)(lu)是一種重要的(de)(de)(de)(de)(de)金(jin)(jin)屬(shu)材(cai)料(liao)(liao)制備(bei)設(she)(she)備(bei),廣(guang)泛應用(yong)(yong)(yong)于(yu)(yu)(yu)冶金(jin)(jin)、材(cai)料(liao)(liao)科學等(deng)(deng)(deng)領域。為(wei)了(le)(le)確保(bao)(bao)(bao)(bao)(bao)真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)熔(rong)(rong)煉(lian)(lian)爐(lu)(lu)(lu)(lu)的(de)(de)(de)(de)(de)正(zheng)常(chang)(chang)運(yun)行(xing)(xing)(xing)和(he)(he)(he)延長使(shi)(shi)(shi)(shi)(shi)用(yong)(yong)(yong)壽(shou)(shou)命(ming),日常(chang)(chang)使(shi)(shi)(shi)(shi)(shi)用(yong)(yong)(yong)過(guo)程(cheng)中(zhong)需要注(zhu)(zhu)(zhu)(zhu)(zhu)(zhu)意(yi)一些(xie)事(shi)(shi)(shi)項(xiang)(xiang)(xiang)。真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)熔(rong)(rong)煉(lian)(lian)爐(lu)(lu)(lu)(lu)廠家(jia)八佳電氣將詳(xiang)細介紹真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)熔(rong)(rong)煉(lian)(lian)爐(lu)(lu)(lu)(lu)的(de)(de)(de)(de)(de)日常(chang)(chang)使(shi)(shi)(shi)(shi)(shi)用(yong)(yong)(yong)注(zhu)(zhu)(zhu)(zhu)(zhu)(zhu)意(yi)事(shi)(shi)(shi)項(xiang)(xiang)(xiang),以幫助用(yong)(yong)(yong)戶更(geng)好地操(cao)(cao)(cao)作(zuo)(zuo)和(he)(he)(he)維護設(she)(she)備(bei)。  真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)熔(rong)(rong)煉(lian)(lian)爐(lu)(lu)(lu)(lu)作(zuo)(zuo)為(wei)一種高(gao)(gao)溫、高(gao)(gao)壓、真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)環境下工(gong)作(zuo)(zuo)的(de)(de)(de)(de)(de)設(she)(she)備(bei),其結(jie)構(gou)(gou)和(he)(he)(he)性能較為(wei)復(fu)雜。在(zai)日常(chang)(chang)使(shi)(shi)(shi)(shi)(shi)用(yong)(yong)(yong)過(guo)程(cheng)中(zhong),如果不(bu)注(zhu)(zhu)(zhu)(zhu)(zhu)(zhu)意(yi)操(cao)(cao)(cao)作(zuo)(zuo)和(he)(he)(he)維護,可能會導致設(she)(she)備(bei)故(gu)(gu)障(zhang)或降低使(shi)(shi)(shi)(shi)(shi)用(yong)(yong)(yong)壽(shou)(shou)命(ming)。因(yin)此(ci),了(le)(le)解并遵(zun)守(shou)真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)熔(rong)(rong)煉(lian)(lian)爐(lu)(lu)(lu)(lu)的(de)(de)(de)(de)(de)日常(chang)(chang)使(shi)(shi)(shi)(shi)(shi)用(yong)(yong)(yong)注(zhu)(zhu)(zhu)(zhu)(zhu)(zhu)意(yi)事(shi)(shi)(shi)項(xiang)(xiang)(xiang)對(dui)(dui)于(yu)(yu)(yu)保(bao)(bao)(bao)(bao)(bao)證設(she)(she)備(bei)正(zheng)常(chang)(chang)運(yun)行(xing)(xing)(xing)和(he)(he)(he)延長使(shi)(shi)(shi)(shi)(shi)用(yong)(yong)(yong)壽(shou)(shou)命(ming)具有(you)重要意(yi)義(yi)。  一、真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)熔(rong)(rong)煉(lian)(lian)爐(lu)(lu)(lu)(lu)的(de)(de)(de)(de)(de)結(jie)構(gou)(gou)與原理  真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)熔(rong)(rong)煉(lian)(lian)爐(lu)(lu)(lu)(lu)主要由爐(lu)(lu)(lu)(lu)體(ti)、加(jia)(jia)熱(re)系(xi)統、真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)系(xi)統、控制系(xi)統等(deng)(deng)(deng)部分(fen)組成。其工(gong)作(zuo)(zuo)原理是在(zai)真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)環境下,通過(guo)加(jia)(jia)熱(re)系(xi)統將金(jin)(jin)屬(shu)材(cai)料(liao)(liao)加(jia)(jia)熱(re)至熔(rong)(rong)化狀態,然后進行(xing)(xing)(xing)冷卻結(jie)晶,以獲(huo)得(de)純凈的(de)(de)(de)(de)(de)金(jin)(jin)屬(shu)材(cai)料(liao)(liao)。  二(er)、真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)熔(rong)(rong)煉(lian)(lian)爐(lu)(lu)(lu)(lu)日常(chang)(chang)使(shi)(shi)(shi)(shi)(shi)用(yong)(yong)(yong)注(zhu)(zhu)(zhu)(zhu)(zhu)(zhu)意(yi)事(shi)(shi)(shi)項(xiang)(xiang)(xiang)  1.操(cao)(cao)(cao)作(zuo)(zuo)前(qian)(qian)檢(jian)(jian)查  在(zai)操(cao)(cao)(cao)作(zuo)(zuo)真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)熔(rong)(rong)煉(lian)(lian)爐(lu)(lu)(lu)(lu)之前(qian)(qian),應檢(jian)(jian)查設(she)(she)備(bei)各(ge)部件是否正(zheng)常(chang)(chang),如爐(lu)(lu)(lu)(lu)體(ti)、加(jia)(jia)熱(re)元(yuan)件、真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)系(xi)統等(deng)(deng)(deng)。同時,檢(jian)(jian)查電源、控制系(xi)統等(deng)(deng)(deng)是否正(zheng)常(chang)(chang)工(gong)作(zuo)(zuo)。確保(bao)(bao)(bao)(bao)(bao)設(she)(she)備(bei)處于(yu)(yu)(yu)良好的(de)(de)(de)(de)(de)工(gong)作(zuo)(zuo)狀態,以避(bi)免(mian)因(yin)設(she)(she)備(bei)故(gu)(gu)障(zhang)而(er)影響生(sheng)(sheng)產。  2.嚴格遵(zun)守(shou)操(cao)(cao)(cao)作(zuo)(zuo)規(gui)程(cheng)  操(cao)(cao)(cao)作(zuo)(zuo)真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)熔(rong)(rong)煉(lian)(lian)爐(lu)(lu)(lu)(lu)時,應嚴格遵(zun)守(shou)操(cao)(cao)(cao)作(zuo)(zuo)規(gui)程(cheng)。按照規(gui)定的(de)(de)(de)(de)(de)步驟(zou)進行(xing)(xing)(xing)操(cao)(cao)(cao)作(zuo)(zuo),避(bi)免(mian)因(yin)操(cao)(cao)(cao)作(zuo)(zuo)不(bu)當(dang)而(er)引發故(gu)(gu)障(zhang)。同時,注(zhu)(zhu)(zhu)(zhu)(zhu)(zhu)意(yi)觀察設(she)(she)備(bei)運(yun)行(xing)(xing)(xing)過(guo)程(cheng)中(zhong)的(de)(de)(de)(de)(de)各(ge)項(xiang)(xiang)(xiang)參數,如溫度、壓力、真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)度等(deng)(deng)(deng),確保(bao)(bao)(bao)(bao)(bao)設(she)(she)備(bei)在(zai)正(zheng)常(chang)(chang)范圍內運(yun)行(xing)(xing)(xing)。  3.定期(qi)(qi)維護與保(bao)(bao)(bao)(bao)(bao)養(yang)  為(wei)了(le)(le)確保(bao)(bao)(bao)(bao)(bao)真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)熔(rong)(rong)煉(lian)(lian)爐(lu)(lu)(lu)(lu)的(de)(de)(de)(de)(de)正(zheng)常(chang)(chang)運(yun)行(xing)(xing)(xing)和(he)(he)(he)延長使(shi)(shi)(shi)(shi)(shi)用(yong)(yong)(yong)壽(shou)(shou)命(ming),應定期(qi)(qi)對(dui)(dui)設(she)(she)備(bei)進行(xing)(xing)(xing)維護與保(bao)(bao)(bao)(bao)(bao)養(yang)。包(bao)括清(qing)潔(jie)爐(lu)(lu)(lu)(lu)體(ti)、檢(jian)(jian)查加(jia)(jia)熱(re)元(yuan)件、更(geng)換真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)泵油等(deng)(deng)(deng)。同時,定期(qi)(qi)對(dui)(dui)設(she)(she)備(bei)進行(xing)(xing)(xing)全方面檢(jian)(jian)查,發現(xian)潛(qian)在(zai)問題及時處理,避(bi)免(mian)因(yin)小問題積累而(er)引發大(da)故(gu)(gu)障(zhang)。  4.注(zhu)(zhu)(zhu)(zhu)(zhu)(zhu)意(yi)安(an)(an)全  在(zai)使(shi)(shi)(shi)(shi)(shi)用(yong)(yong)(yong)真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)熔(rong)(rong)煉(lian)(lian)爐(lu)(lu)(lu)(lu)時,應注(zhu)(zhu)(zhu)(zhu)(zhu)(zhu)意(yi)安(an)(an)全。操(cao)(cao)(cao)作(zuo)(zuo)過(guo)程(cheng)中(zhong)應佩戴防(fang)護眼鏡、手套(tao)等(deng)(deng)(deng)個人防(fang)護用(yong)(yong)(yong)品。同時,避(bi)免(mian)在(zai)設(she)(she)備(bei)運(yun)行(xing)(xing)(xing)過(guo)程(cheng)中(zhong)進行(xing)(xing)(xing)清(qing)潔(jie)和(he)(he)(he)維護工(gong)作(zuo)(zuo),以免(mian)發生(sheng)(sheng)意(yi)外(wai)事(shi)(shi)(shi)故(gu)(gu)。  5.保(bao)(bao)(bao)(bao)(bao)持環境清(qing)潔(jie)  真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)熔(rong)(rong)煉(lian)(lian)爐(lu)(lu)(lu)(lu)的(de)(de)(de)(de)(de)工(gong)作(zuo)(zuo)環境應保(bao)(bao)(bao)(bao)(bao)持清(qing)潔(jie)干燥。避(bi)免(mian)在(zai)潮濕或污染的(de)(de)(de)(de)(de)環境中(zhong)使(shi)(shi)(shi)(shi)(shi)用(yong)(yong)(yong)設(she)(she)備(bei),以免(mian)影響設(she)(she)備(bei)的(de)(de)(de)(de)(de)正(zheng)常(chang)(chang)運(yun)行(xing)(xing)(xing)和(he)(he)(he)使(shi)(shi)(shi)(shi)(shi)用(yong)(yong)(yong)壽(shou)(shou)命(ming)。  本文介紹了(le)(le)真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)熔(rong)(rong)煉(lian)(lian)爐(lu)(lu)(lu)(lu)的(de)(de)(de)(de)(de)日常(chang)(chang)使(shi)(shi)(shi)(shi)(shi)用(yong)(yong)(yong)注(zhu)(zhu)(zhu)(zhu)(zhu)(zhu)意(yi)事(shi)(shi)(shi)項(xiang)(xiang)(xiang),包(bao)括操(cao)(cao)(cao)作(zuo)(zuo)前(qian)(qian)檢(jian)(jian)查、遵(zun)守(shou)操(cao)(cao)(cao)作(zuo)(zuo)規(gui)程(cheng)、定期(qi)(qi)維護與保(bao)(bao)(bao)(bao)(bao)養(yang)、注(zhu)(zhu)(zhu)(zhu)(zhu)(zhu)意(yi)安(an)(an)全以及保(bao)(bao)(bao)(bao)(bao)持環境清(qing)潔(jie)等(deng)(deng)(deng)方面。了(le)(le)解并遵(zun)守(shou)這(zhe)些(xie)注(zhu)(zhu)(zhu)(zhu)(zhu)(zhu)意(yi)事(shi)(shi)(shi)項(xiang)(xiang)(xiang)對(dui)(dui)于(yu)(yu)(yu)保(bao)(bao)(bao)(bao)(bao)證真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)熔(rong)(rong)煉(lian)(lian)爐(lu)(lu)(lu)(lu)的(de)(de)(de)(de)(de)正(zheng)常(chang)(chang)運(yun)行(xing)(xing)(xing)和(he)(he)(he)延長使(shi)(shi)(shi)(shi)(shi)用(yong)(yong)(yong)壽(shou)(shou)命(ming)具有(you)重要意(yi)義(yi)。希望本文能夠幫助用(yong)(yong)(yong)戶更(geng)好地操(cao)(cao)(cao)作(zuo)(zuo)和(he)(he)(he)維護真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)熔(rong)(rong)煉(lian)(lian)爐(lu)(lu)(lu)(lu),提高(gao)(gao)生(sheng)(sheng)產效率和(he)(he)(he)質量。

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真空甩帶爐進行熱處理時有哪些技巧

真空甩帶爐進行熱處理時有哪些技巧

  真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)甩(shuai)(shuai)(shuai)帶(dai)(dai)爐(lu)進(jin)行熱(re)處(chu)理(li)時(shi)有(you)哪些技(ji)巧(qiao)   真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)甩(shuai)(shuai)(shuai)帶(dai)(dai)爐(lu)和中頻電爐(lu)在(zai)(zai)熱(re)加(jia)工領域(yu)有(you)著很好(hao)的發展前景(jing),用(yong)(yong)(yong)(yong)于(yu):透熱(re)、軋制、鍛造、彎(wan)管、熱(re)處(chu)理(li)(淬火)、焊接等工藝(yi)的感(gan)應(ying)(ying)加(jia)熱(re)。那么(me)它(ta)的熱(re)處(chu)理(li)技(ji)巧(qiao)是什么(me)呢?   1.真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)甩(shuai)(shuai)(shuai)帶(dai)(dai)爐(lu)處(chu)理(li)鈦(tai)合(he)金(jin)時(shi),不(bu)宜用(yong)(yong)(yong)(yong)氮(dan)(dan)(dan)(dan)氣(qi)(qi)(qi)(qi)(qi)作(zuo)為(wei)(wei)冷(leng)(leng)卻氣(qi)(qi)(qi)(qi)(qi)體(ti),因為(wei)(wei)鈦(tai)和氮(dan)(dan)(dan)(dan)在(zai)(zai)高溫(wen)(wen)(wen)下反(fan)應(ying)(ying),形(xing)成金(jin)黃色的氮(dan)(dan)(dan)(dan)化鈦(tai)。   2.活(huo)動連接部分(fen)(fen)全部采用(yong)(yong)(yong)(yong)O型橡膠圈(quan)密封連接,此部分(fen)(fen)均通水(shui)冷(leng)(leng)卻。   3.工件(jian)在(zai)(zai)真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)狀態下淬火,應(ying)(ying)使用(yong)(yong)(yong)(yong)真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)淬火油(you)(you),此油(you)(you)具有(you)較低的飽和蒸氣(qi)(qi)(qi)(qi)(qi)壓。   4.真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)甩(shuai)(shuai)(shuai)帶(dai)(dai)爐(lu)保養應(ying)(ying)在(zai)(zai)真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)或充純氮(dan)(dan)(dan)(dan)狀態下,避免平時(shi)不(bu)用(yong)(yong)(yong)(yong)時(shi)吸氣(qi)(qi)(qi)(qi)(qi),吸潮(chao)。   5.國(guo)(guo)內(nei)的壓升率應(ying)(ying)不(bu)大(da)于(yu)1.33Pa/h,國(guo)(guo)外某些企業的標(biao)準為(wei)(wei)0.67Pa/h   6.真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)加(jia)熱(re)以輻射為(wei)(wei)主,工件(jian)在(zai)(zai)爐(lu)內(nei)應(ying)(ying)該保持間距。   7.升溫(wen)(wen)(wen)過程中,工件(jian)及(ji)(ji)爐(lu)內(nei)材料會放氣(qi)(qi)(qi)(qi)(qi),使真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)度(du)下降。   8.真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)回火、真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)退火、真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)固溶處(chu)理(li)及(ji)(ji)真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)時(shi)效的加(jia)熱(re)溫(wen)(wen)(wen)度(du)一(yi)(yi)般與常規處(chu)理(li)時(shi)加(jia)熱(re)溫(wen)(wen)(wen)度(du)相同。   9.真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)甩(shuai)(shuai)(shuai)帶(dai)(dai)爐(lu)應(ying)(ying)該具有(you)快冷(leng)(leng)裝置。冷(leng)(leng)卻水(shui)的壓力應(ying)(ying)該大(da)于(yu)0.2Mpa,流量應(ying)(ying)可調。   10.冷(leng)(leng)卻氣(qi)(qi)(qi)(qi)(qi)體(ti):鋼一(yi)(yi)般采用(yong)(yong)(yong)(yong)百(bai)分(fen)(fen)之(zhi)99.995純度(du)的氮(dan)(dan)(dan)(dan)氣(qi)(qi)(qi)(qi)(qi),高溫(wen)(wen)(wen)合(he)金(jin)采用(yong)(yong)(yong)(yong)百(bai)分(fen)(fen)之(zhi)99.999的氮(dan)(dan)(dan)(dan)氣(qi)(qi)(qi)(qi)(qi)或氬(ya)氣(qi)(qi)(qi)(qi)(qi),鈦(tai)合(he)金(jin)采用(yong)(yong)(yong)(yong)百(bai)分(fen)(fen)之(zhi)99.995的氬(ya)氣(qi)(qi)(qi)(qi)(qi)。   11.升溫(wen)(wen)(wen):放入工件(jian)后(hou),一(yi)(yi)般先預(yu)抽至6.67Pa時(shi)方可升溫(wen)(wen)(wen)加(jia)熱(re)。   看(kan)完本文(wen),相信(xin)您對真(zhen)(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)甩(shuai)(shuai)(shuai)帶(dai)(dai)爐(lu)熱(re)處(chu)理(li)技(ji)巧(qiao)有(you)一(yi)(yi)定的認識了,如有(you)產品(pin)方面的需求,請立(li)即聯(lian)系(xi)我們(men)哦!