德州三墾變頻器經銷商哪家好
三(san)(san)墾(ken)變(bian)頻(pin)器擁有(you)完善(shan)的(de)售后服務體(ti)系,為(wei)用(yong)(yong)(yong)戶(hu)提供技(ji)術(shu)支(zhi)持(chi)和服務保(bao)障。具體(ti)包(bao)括:擁有(you)專業(ye)的(de)技(ji)術(shu)團隊,能(neng)夠(gou)為(wei)用(yong)(yong)(yong)戶(hu)提供技(ji)術(shu)支(zhi)持(chi)和咨詢服務,包(bao)括產(chan)品(pin)選型、設(she)備(bei)(bei)(bei)(bei)調試(shi)、故障排除等方面的(de)問題(ti)。擁有(you)多個售后服務中心和維修站點,能(neng)夠(gou)為(wei)用(yong)(yong)(yong)戶(hu)提供快速(su)的(de)設(she)備(bei)(bei)(bei)(bei)維修和故障排除服務,確保(bao)設(she)備(bei)(bei)(bei)(bei)的(de)正常(chang)運(yun)行(xing)。定期組織產(chan)品(pin)培訓和技(ji)術(shu)交流會,為(wei)用(yong)(yong)(yong)戶(hu)提供專業(ye)的(de)產(chan)品(pin)知識和技(ji)術(shu)指(zhi)導,幫助用(yong)(yong)(yong)戶(hu)更(geng)好地使用(yong)(yong)(yong)和維護設(she)備(bei)(bei)(bei)(bei)。擁有(you)完善(shan)的(de)備(bei)(bei)(bei)(bei)件供應(ying)體(ti)系,能(neng)夠(gou)為(wei)用(yong)(yong)(yong)戶(hu)提供快速(su)的(de)備(bei)(bei)(bei)(bei)件供應(ying)和配(pei)送服務,保(bao)證設(she)備(bei)(bei)(bei)(bei)的(de)正常(chang)運(yun)行(xing)。淄博科(ke)恩(en)電氣(qi)自動化技(ji)術(shu)有(you)限(xian)公司努力學習、開拓進取、奮(fen)力拼搏。德州三(san)(san)墾(ken)變(bian)頻(pin)器經(jing)銷商哪(na)家好
目前,較常見的用(yong)變(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)(qi)(qi)(qi)(qi)主要有風機(ji)用(yong)變(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)(qi)(qi)(qi)(qi)、電(dian)(dian)梯(ti)用(yong)變(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)(qi)(qi)(qi)(qi)、恒壓供水(水泵)用(yong)變(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)(qi)(qi)(qi)(qi)、卷繞用(yong)變(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)(qi)(qi)(qi)(qi)、線切割用(yong)變(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)(qi)(qi)(qi)(qi)等。變(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)(qi)(qi)(qi)(qi)的主回(hui)路(lu)端子E須接(jie)(jie)地(di)(di),該(gai)(gai)接(jie)(jie)地(di)(di)可(ke)以和該(gai)(gai)變(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)(qi)(qi)(qi)(qi)所(suo)帶的電(dian)(dian)機(ji)共地(di)(di),但不(bu)(bu)能(neng)與其它的設(she)(she)備共地(di)(di),須單(dan)獨打接(jie)(jie)地(di)(di)極(ji),且該(gai)(gai)接(jie)(jie)地(di)(di)點(dian)應(ying)該(gai)(gai)盡(jin)量遠離(li)弱電(dian)(dian)設(she)(she)備的接(jie)(jie)地(di)(di)點(dian)。同時,變(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)(qi)(qi)(qi)(qi)接(jie)(jie)地(di)(di)導線的截面積應(ying)不(bu)(bu)小(xiao)于4MM2,長度應(ying)控制在20M以內(nei)。依據相應(ying)變(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)(qi)(qi)(qi)(qi)產品(pin)(pin)要求,所(suo)有電(dian)(dian)動機(ji)電(dian)(dian)纜總長度加和,不(bu)(bu)能(neng)超過(guo)變(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)(qi)(qi)(qi)(qi)產品(pin)(pin)要求的允(yun)許范圍。海南三墾變(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)(qi)(qi)(qi)(qi)價(jia)格(ge)淄(zi)博科(ke)恩電(dian)(dian)氣自(zi)動化(hua)技術有限公司希望在大(da)家一起(qi)互利(li)共贏情況下(xia),共同發(fa)展。
同時(shi)也(ye)為電(dian)(dian)氣(qi)工作者設(she)計(ji)電(dian)(dian)氣(qi)線路、節能(neng)改造(zao)、開發新產品等(deng)提供(gong)了較(jiao)(jiao)大(da)(da)的(de)方便。當變頻(pin)器(qi)(qi)升(sheng)速(su)時(shi)過電(dian)(dian)流(liu)的(de)負載慣性(xing)(xing)較(jiao)(jiao)大(da)(da),而升(sheng)速(su)時(shi)間又設(she)定得太(tai)短時(shi),意味著在(zai)升(sheng)速(su)過程中,變頻(pin)器(qi)(qi)的(de)工作效率(lv)上升(sheng)太(tai)快,電(dian)(dian)動機(ji)(ji)的(de)同步轉(zhuan)速(su)迅(xun)速(su)上升(sheng),而電(dian)(dian)動機(ji)(ji)轉(zhuan)子的(de)轉(zhuan)速(su)因負載慣性(xing)(xing)較(jiao)(jiao)大(da)(da)而跟不(bu)上去,結(jie)果是(shi)升(sheng)速(su)電(dian)(dian)流(liu)太(tai)大(da)(da)。開環(huan)矢量(liang)型變頻(pin)器(qi)(qi),可用來控制異步交流(liu)感應(ying)(ying)電(dian)(dian)機(ji)(ji)。產品采用國(guo)際的(de)無速(su)度傳感器(qi)(qi)矢量(liang)控制技術,運用DSP控制系統(tong),并且強(qiang)化產品的(de)可靠性(xing)(xing)和環(huan)境的(de)適應(ying)(ying)性(xing)(xing)以及客戶(hu)化的(de)設(she)計(ji),功能(neng)更優化,應(ying)(ying)用更靈活,性(xing)(xing)能(neng)更穩定。
在變頻(pin)器(qi)降速(su)中過(guo)電(dian)(dian)(dian)(dian)流的(de)(de)(de)負(fu)載(zai)慣性較(jiao)大(da),而(er)降速(su)時(shi)(shi)間設定(ding)得太(tai)短(duan)時(shi)(shi),也會引起過(guo)電(dian)(dian)(dian)(dian)流。因(yin)(yin)為(wei),降速(su)時(shi)(shi)間太(tai)短(duan),同時(shi)(shi)轉(zhuan)速(su)會迅速(su)下降,而(er)電(dian)(dian)(dian)(dian)動機轉(zhuan)子因(yin)(yin)負(fu)載(zai)的(de)(de)(de)慣性大(da),仍維持較(jiao)高的(de)(de)(de)轉(zhuan)速(su),這時(shi)(shi)同樣可以(yi)是轉(zhuan)子繞組切割(ge)磁(ci)力線的(de)(de)(de)速(su)度太(tai)大(da)而(er)產生過(guo)電(dian)(dian)(dian)(dian)流。經過(guo)對變頻(pin)器(qi)主(zhu)接(jie)觸器(qi)進行拆開后發現造成這一故障的(de)(de)(de)主(zhu)要原因(yin)(yin)是由于變頻(pin)器(qi)中的(de)(de)(de)開關(guan)電(dian)(dian)(dian)(dian)源與主(zhu)接(jie)觸器(qi)線包一路的(de)(de)(de)濾波電(dian)(dian)(dian)(dian)容(rong)漏電(dian)(dian)(dian)(dian),從而(er)導致電(dian)(dian)(dian)(dian)壓(ya)偏(pian)低(di),導致無法正(zheng)常吸合(he),如(ru)供電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)壓(ya)較(jiao)高這一問(wen)題(ti)還(huan)可以(yi)掩蓋過(guo)去而(er)當電(dian)(dian)(dian)(dian)壓(ya)較(jiao)低(di)時(shi)(shi)問(wen)題(ti)則會較(jiao)為(wei)明(ming)顯的(de)(de)(de)暴(bao)露出(chu)來。科恩電(dian)(dian)(dian)(dian)氣歡(huan)迎廣大(da)新老顧客來電(dian)(dian)(dian)(dian)咨詢和洽談,我(wo)們(men)將竭誠為(wei)您(nin)服務!
作為工業(ye)生(sheng)產(chan)中重要的(de)(de)(de)(de)電(dian)(dian)氣設備,變(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)承載著許多(duo)設備的(de)(de)(de)(de)穩(wen)定(ding)運(yun)行(xing),但是(shi)(shi)變(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)也(ye)是(shi)(shi)一個易損件(jian),一旦出現(xian)故(gu)障,將會直(zhi)接影響生(sheng)產(chan)效(xiao)率(lv)。為了避免設備故(gu)障對生(sheng)產(chan)造成(cheng)的(de)(de)(de)(de)損失,及時進行(xing)變(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)維修是(shi)(shi)非常必要的(de)(de)(de)(de)。AC風機調(diao)速(su)的(de)(de)(de)(de)電(dian)(dian)子(zi)控(kong)(kong)(kong)制(zhi)方法(fa)有(you)很(hen)多(duo),但常見(jian)的(de)(de)(de)(de)是(shi)(shi)變(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)控(kong)(kong)(kong)制(zhi)。變(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)是(shi)(shi)一種能將交流(liu)電(dian)(dian)轉換成(cheng)可調(diao)的(de)(de)(de)(de)直(zhi)流(liu)電(dian)(dian),并能隨時控(kong)(kong)(kong)制(zhi)直(zhi)流(liu)電(dian)(dian)的(de)(de)(de)(de)形式和參數(shu)的(de)(de)(de)(de)電(dian)(dian)子(zi)器(qi)件(jian)。通過變(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)控(kong)(kong)(kong)制(zhi)電(dian)(dian)機的(de)(de)(de)(de)電(dian)(dian)源頻(pin)(pin)(pin)率(lv)和電(dian)(dian)壓來改變(bian)(bian)(bian)(bian)電(dian)(dian)機的(de)(de)(de)(de)轉速(su),進而實現(xian)風機調(diao)速(su)。變(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)是(shi)(shi)一個相當復(fu)雜的(de)(de)(de)(de)控(kong)(kong)(kong)制(zhi)系(xi)統,大(da)多(duo)數(shu)變(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)具有(you)單(dan)(dan)獨的(de)(de)(de)(de)電(dian)(dian)力電(dian)(dian)子(zi)電(dian)(dian)路、信號處理單(dan)(dan)元、邏輯控(kong)(kong)(kong)制(zhi)單(dan)(dan)元、運(yun)動(dong)控(kong)(kong)(kong)制(zhi)單(dan)(dan)元等各類功(gong)能單(dan)(dan)元。淄博科恩電(dian)(dian)氣自動(dong)化技術有(you)限公司擁有(you)嚴謹嚴格的(de)(de)(de)(de)質(zhi)量控(kong)(kong)(kong)制(zhi)監(jian)控(kong)(kong)(kong)團隊。福建三墾變(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)經銷商哪家好
科恩電氣高(gao)起點高(gao)質量(liang)高(gao)速(su)度高(gao)效益大規模的經(jing)營發展。德州三(san)墾變頻(pin)器(qi)經(jing)銷商哪家好
不論哪種形式(shi)的(de)(de)變(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi),在運(yun)行(xing)中均產生不同程度的(de)(de)諧(xie)波電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)和電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu),使(shi)發電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)在非正弦電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)下運(yun)轉。拒資料(liao)推(tui)薦,以(yi)目前普遍使(shi)用的(de)(de)正弦波PWM型變(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)為例,其低次諧(xie)波基(ji)礎為零,剩下的(de)(de)比載波頻(pin)(pin)(pin)率大一倍左右的(de)(de)高次諧(xie)波分量為:2u+1(u為調制(zhi)比)。變(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)的(de)(de)輸出(chu)(chu)有電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)檢測功(gong)能(neng),變(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)能(neng)自動調整輸出(chu)(chu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya),使(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)不承受過電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)。即(ji)使(shi)在輸出(chu)(chu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)調整失效和輸出(chu)(chu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)超過正常電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)的(de)(de)110%時,變(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)也會通過停機(ji)對電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)起到保(bao)(bao)護作(zuo)用。同樣的(de)(de)當(dang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)低于正常電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)的(de)(de)90%時,變(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)保(bao)(bao)護停機(ji)。德州(zhou)三墾變(bian)(bian)(bian)(bian)頻(pin)(pin)(pin)器(qi)經銷商哪家好
淄(zi)博科(ke)恩(en)電氣自動(dong)化(hua)技術有(you)限(xian)公司在同(tong)(tong)行業領域中,一(yi)(yi)直處在一(yi)(yi)個不(bu)斷(duan)銳意進(jin)(jin)取(qu),不(bu)斷(duan)制(zhi)造創新的市(shi)(shi)場高度,多年以(yi)來(lai)致力(li)于(yu)發(fa)展富有(you)創新價值理念的產品標準(zhun),在山東省等地區的電工電氣中始終保持良好(hao)的商(shang)業口(kou)碑,成(cheng)績讓我(wo)們(men)(men)喜悅(yue),但(dan)不(bu)會讓我(wo)們(men)(men)止步,殘酷的市(shi)(shi)場磨煉了我(wo)們(men)(men)堅強不(bu)屈的意志(zhi),和諧溫馨(xin)的工作(zuo)環境,富有(you)營(ying)養(yang)(yang)的公司土壤滋養(yang)(yang)著我(wo)們(men)(men)不(bu)斷(duan)開拓創新,勇于(yu)進(jin)(jin)取(qu)的無限(xian)潛力(li),科(ke)恩(en)電氣供應攜手大家一(yi)(yi)起走向共同(tong)(tong)輝煌的未來(lai),回首(shou)過(guo)去,我(wo)們(men)(men)不(bu)會因(yin)為取(qu)得了一(yi)(yi)點(dian)點(dian)成(cheng)績而沾(zhan)沾(zhan)自喜,相(xiang)反的是面對(dui)競爭越(yue)(yue)來(lai)越(yue)(yue)激烈的市(shi)(shi)場氛圍,我(wo)們(men)(men)更要明確自己的不(bu)足(zu),做好(hao)迎接新挑(tiao)戰的準(zhun)備(bei),要不(bu)畏困難,激流勇進(jin)(jin),以(yi)一(yi)(yi)個更嶄新的精(jing)神面貌迎接大家,共同(tong)(tong)走向輝煌回來(lai)!
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自動(dong)錫焊(han)(han)(han)機是一種將焊(han)(han)(han)錫自動(dong)化的設(she)備,主(zhu)要應用于(yu)電子(zi)(zi)、通(tong)信、計算機、家電等行業中的電子(zi)(zi)元器件的生產和(he)維修中。它能夠(gou)將焊(han)(han)(han)錫材料溶(rong)化,并(bing)將其涂(tu)敷在(zai)需要焊(han)(han)(han)接的部件上,從而實(shi)現(xian)焊(han)(han)(han)接的效果。自動(dong)錫焊(han)(han)(han)機通(tong)常由以下幾 。
導視(shi)牌的(de)擺放位置應(ying)合理布(bu)置,以便人(ren)們在行(xing)走過程中輕松發現和讀取相關導向信息。從人(ren)因(yin)工程學的(de)角(jiao)度來(lai)看(kan),導視(shi)牌的(de)位置應(ying)考慮人(ren)們的(de)視(shi)覺注意力和行(xing)為習慣(guan)。首先,導視(shi)牌應(ying)該放置在人(ren)們自然而(er)然會朝向的(de)方(fang)向上(shang),比(bi)如 。
選擇砂輪(lun)和(he)導(dao)(dao)(dao)輪(lun),砂輪(lun)和(he)導(dao)(dao)(dao)輪(lun)需要根(gen)據尺寸和(he)特性來(lai)進行選擇的(de)(de)(de),使(shi)用通磨來(lai)進行磨削加工時,需要由磨床(chuang)的(de)(de)(de)型號來(lai)決定的(de)(de)(de),如M1080無心(xin)磨床(chuang),其砂輪(lun)的(de)(de)(de)寬(kuan)度(du)為(wei)150mm,導(dao)(dao)(dao)輪(lun)的(de)(de)(de)寬(kuan)度(du)為(wei)150mm。根(gen)據無心(xin)磨床(chuang)的(de)(de)(de)型號 。
調試(shi)方(fang)法(fa)編輯投入(ru)式液位變送(song)器在出廠時已按(an)銘牌標注量(liang)程精確校正,只要介質的密度等參數符(fu)合銘牌要求,一般無需調整。卻(que)需要調整量(liang)程或零位,請按(an)以下方(fang)法(fa)調校:  1、擰(ning)下保護(hu)蓋,外(wai)接標準2 。
速(su)差式防墜器(qi)使(shi)用方法:每次使(shi)用時(shi),必(bi)須作一次外觀檢查(cha),在使(shi)用過(guo)程中,也(ye)注(zhu)意(yi)查(cha)看(kan),在半至1年內要(yao)試驗(yan)一次。以主(zhu)部件不損壞為要(yao)求,如(ru)發現有破損變質情況(kuang)及時(shi)反(fan)映(ying),并停止使(shi)用,以保操作安全(quan)。速(su)差式防墜器(qi)固定懸 。
食堂(tang)承包商通常提(ti)供經(jing)濟實(shi)(shi)惠的(de)(de)餐飲選(xuan)項。他們(men)會設計菜(cai)單,以滿足消費者對(dui)價(jia)格敏感的(de)(de)需(xu)求(qiu)。通常會提(ti)供一(yi)(yi)些價(jia)格相(xiang)對(dui)較低的(de)(de)菜(cai)品或(huo)套餐,以便員(yuan)工或(huo)學生能(neng)夠選(xuan)擇經(jing)濟實(shi)(shi)惠的(de)(de)選(xuan)項。、、此外,一(yi)(yi)些食堂(tang)承包商還提(ti)供特定(ding)的(de)(de)促 。
運(yun)(yun)動的(de)時(shi)候大(da)(da)家(jia)都(dou)知(zhi)道是(shi)會出汗的(de),所(suo)以如果所(suo)使用(yong)(yong)的(de)毛巾不(bu)吸汗那這條(tiao)毛巾的(de)作用(yong)(yong)就真的(de)不(bu)大(da)(da)了,所(suo)以大(da)(da)家(jia)咋夠買(mai)的(de)時(shi)候非常簡單的(de)要(yao)(yao)考慮(lv)的(de)因素便是(shi)要(yao)(yao)吸汗。另外與傳(chuan)統的(de)運(yun)(yun)動毛巾相比,想要(yao)(yao)更有儀式感(gan),數碼印花定制運(yun)(yun)動 。
脫硫系(xi)統空(kong)氣預(yu)熱器:它(ta)是一(yi)個(ge)旋轉(zhuan)(zhuan)(zhuan)式熱交(jiao)換器和一(yi)個(ge)逆流操作的再生(sheng)式熱交(jiao)換器。具有特殊波(bo)紋的蓄熱元件緊密地放置(zhi)在扇形轉(zhuan)(zhuan)(zhuan)子(zi)(zi)室中,其中轉(zhuan)(zhuan)(zhuan)子(zi)(zi)以。空(kong)氣通道分為一(yi)級和二級空(kong)氣通道。當流過轉(zhuan)(zhuan)(zhuan)子(zi)(zi)時,廢氣將熱量(liang)釋放到儲(chu)熱 。
音(yin)樂(le)可(ke)以什么(me)?孔祥東認為(wei),音(yin)樂(le)可(ke)以幫助人們(men)心病。音(yin)樂(le)無法用語言形(xing)容,但卻是真實的(de)存在。當人們(men)出現焦慮、抑郁(yu)的(de)情緒(xu)而又無處可(ke)說時,音(yin)樂(le)是比較好的(de)“朋友”。有研究(jiu)表明(ming),音(yin)樂(le)對人的(de)肢體、大腦都能通過共振來互 。
FBA轉(zhuan)運補(bu)(bu)倉的(de)優(you)缺(que)點(dian),優(you)點(dian):1. 擴大了(le)市場:對(dui)于亞(ya)馬遜賣家(jia)來說,FBA轉(zhuan)運補(bu)(bu)倉可(ke)以幫助他們將(jiang)產品(pin)存儲在靠近消費者的(de)地區(qu),縮短了(le)配送(song)時(shi)間,提高了(le)客戶滿意度,從(cong)而擴大了(le)銷(xiao)售(shou)市場。2. 節省成本:FBA 。
保(bao)(bao)護膠(jiao)(jiao)液(ye)對成(cheng)粒(li)的影(ying)響彩(cai)粒(li)之所(suo)以(yi)能夠形(xing)成(cheng)和穩定,主要是(shi)依靠(kao)靜電(dian)排斥作(zuo)(zuo)用(yong)(yong)及保(bao)(bao)護膠(jiao)(jiao)液(ye)的分割。保(bao)(bao)護膠(jiao)(jiao)液(ye)中的離(li)子由(you)于被彩(cai)粒(li)吸附而導致彩(cai)粒(li)帶電(dian),形(xing)成(cheng)保(bao)(bao)護膜(mo),從而具有保(bao)(bao)護作(zuo)(zuo)用(yong)(yong)。防止其二次聚沉。造粒(li)時保(bao)(bao)護膠(jiao)(jiao)液(ye)中的硅(gui)酸 。