振(zhen)(zhen)(zhen)(zhen)動(dong)時(shi)效技術及(ji)在木(mu)(mu)工(gong)(gong)(gong)機(ji)(ji)床(chuang)中(zhong)(zhong)(zhong)的(de)(de)(de)(de)應(ying)(ying)用(yong)：隨(sui)著我國工(gong)(gong)(gong)業生產的(de)(de)(de)(de)持續發展，工(gong)(gong)(gong)件(jian)(jian)(jian)(jian)加(jia)工(gong)(gong)(gong)逐漸引(yin)起了工(gong)(gong)(gong)業領域的(de)(de)(de)(de)關注(zhu)。由于工(gong)(gong)(gong)件(jian)(jian)(jian)(jian)加(jia)工(gong)(gong)(gong)過(guo)程易受外界因(yin)素影響(xiang)，因(yin)此(ci)(ci)工(gong)(gong)(gong)件(jian)(jian)(jian)(jian)表面(mian)和內(nei)(nei)部出(chu)現不(bu)(bu)均(jun)(jun)勻(yun)的(de)(de)(de)(de)殘(can)余(yu)應(ying)(ying)力(li)(li)(li)(li)，從而導致零件(jian)(jian)(jian)(jian)狀態(tai)不(bu)(bu)穩(wen)定，工(gong)(gong)(gong)件(jian)(jian)(jian)(jian)整體(ti)機(ji)(ji)械性(xing)(xing)(xing)能(neng)低(di)，工(gong)(gong)(gong)件(jian)(jian)(jian)(jian)尺寸不(bu)(bu)符合標準。因(yin)此(ci)(ci)，為解決工(gong)(gong)(gong)件(jian)(jian)(jian)(jian)表面(mian)和內(nei)(nei)部不(bu)(bu)均(jun)(jun)勻(yun)的(de)(de)(de)(de)殘(can)余(yu)應(ying)(ying)力(li)(li)(li)(li)問題，增強(qiang)工(gong)(gong)(gong)件(jian)(jian)(jian)(jian)整體(ti)機(ji)(ji)械性(xing)(xing)(xing)能(neng)，通常(chang)(chang)在木(mu)(mu)工(gong)(gong)(gong)機(ji)(ji)床(chuang)中(zhong)(zhong)(zhong)采用(yong)振(zhen)(zhen)(zhen)(zhen)動(dong)時(shi)效工(gong)(gong)(gong)藝(yi)，使得工(gong)(gong)(gong)件(jian)(jian)(jian)(jian)尺寸滿足精(jing)度(du)要求(qiu)。振(zhen)(zhen)(zhen)(zhen)動(dong)時(shi)效技術及(ji)其機(ji)(ji)理(li)：振(zhen)(zhen)(zhen)(zhen)動(dong)時(shi)效技術指(zhi)的(de)(de)(de)(de)是(shi)利用(yong)振(zhen)(zhen)(zhen)(zhen)動(dong)能(neng)量對工(gong)(gong)(gong)件(jian)(jian)(jian)(jian)進行處理(li)及(ji)優化，以(yi)此(ci)(ci)達(da)到消(xiao)除(chu)工(gong)(gong)(gong)件(jian)(jian)(jian)(jian)殘(can)余(yu)應(ying)(ying)力(li)(li)(li)(li)的(de)(de)(de)(de)目(mu)的(de)(de)(de)(de)。現階段，國內(nei)(nei)外多從宏(hong)觀(guan)(guan)角度(du)及(ji)微觀(guan)(guan)角度(du)對振(zhen)(zhen)(zhen)(zhen)動(dong)時(shi)效技術及(ji)其機(ji)(ji)理(li)進行探究。從宏(hong)觀(guan)(guan)角度(du)分(fen)析，零件(jian)(jian)(jian)(jian)易因(yin)振(zhen)(zhen)(zhen)(zhen)動(dong)而產生變(bian)(bian)形，減弱殘(can)余(yu)應(ying)(ying)力(li)(li)(li)(li)可增強(qiang)零件(jian)(jian)(jian)(jian)穩(wen)定性(xing)(xing)(xing)，從而保證零件(jian)(jian)(jian)(jian)尺寸精(jing)度(du)。因(yin)此(ci)(ci)在工(gong)(gong)(gong)件(jian)(jian)(jian)(jian)生產過(guo)程中(zhong)(zhong)(zhong)，采用(yong)熱時(shi)效方法減小殘(can)余(yu)應(ying)(ying)力(li)(li)(li)(li)。從微觀(guan)(guan)方面(mian)分(fen)析，振(zhen)(zhen)(zhen)(zhen)動(dong)時(shi)效是(shi)對零件(jian)(jian)(jian)(jian)施加(jia)一種循環載荷(he)附(fu)加(jia)應(ying)(ying)力(li)(li)(li)(li)。工(gong)(gong)(gong)業生產中(zhong)(zhong)(zhong)通常(chang)(chang)缺(que)乏(fa)彈性(xing)(xing)(xing)體(ti)材(cai)料(liao)，因(yin)此(ci)(ci)材(cai)料(liao)內(nei)(nei)部通常(chang)(chang)存(cun)在微觀(guan)(guan)缺(que)陷，這些微觀(guan)(guan)缺(que)陷都存(cun)在程度(du)各異的(de)(de)(de)(de)應(ying)(ying)力(li)(li)(li)(li)集中(zhong)(zhong)(zhong)。木(mu)(mu)工(gong)(gong)(gong)機(ji)(ji)床(chuang)工(gong)(gong)(gong)作中(zhong)(zhong)(zhong)，工(gong)(gong)(gong)件(jian)(jian)(jian)(jian)變(bian)(bian)應(ying)(ying)力(li)(li)(li)(li)與(yu)殘(can)余(yu)應(ying)(ying)力(li)(li)(li)(li)疊加(jia)，導致材(cai)料(liao)出(chu)現塑性(xing)(xing)(xing)變(bian)(bian)形現象(xiang)。振(zhen)(zhen)(zhen)(zhen)動(dong)時(shi)效的(de)(de)(de)(de)研(yan)究可以(yi)為振(zhen)(zhen)(zhen)(zhen)動(dong)控制和減振(zhen)(zhen)(zhen)(zhen)裝置的(de)(de)(de)(de)設(she)計和優化提(ti)供支持。蘇州不(bu)(bu)銹(xiu)鋼振(zhen)(zhen)(zhen)(zhen)動(dong)時(shi)效設(she)備(bei)哪家專業

振動時(shi)(shi)效(xiao)(xiao)(xiao)的(de)(de)局限性有哪些呢？1）不(bu)能(neng)替代去應(ying)力(li)目的(de)(de)以(yi)外的(de)(de)熱處理；2）不(bu)能(neng)明顯改變金相組織及機(ji)械性能(neng)（如強度(du)，硬(ying)度(du)）；3）不(bu)能(neng)用于校形(xing)(xing)；4）對于箱，板(ban)形(xing)(xing)工件(jian)時(shi)(shi)效(xiao)(xiao)(xiao)噪音較(jiao)大(da)；5）工藝(yi)效(xiao)(xiao)(xiao)果(guo)(guo)在很(hen)大(da)程度(du)上取決(jue)于工藝(yi)員的(de)(de)振動時(shi)(shi)效(xiao)(xiao)(xiao)工藝(yi)理論水平和(he)經驗；6）不(bu)適宜(yi)于高壓容器，殘余應(ying)力(li)較(jiao)小(xiao)(xiao)的(de)(de)工件(jian)，大(da)尺(chi)寸的(de)(de)薄(bo)板(ban)焊(han)接件(jian)，薄(bo)壁鑄(zhu)件(jian)，大(da)部分(fen)冷加(jia)工件(jian)，彈性結構應(ying)力(li)為(wei)主的(de)(de)工件(jian)，剛(gang)性過大(da)或尺(chi)寸過小(xiao)(xiao)件(jian)（其中(zhong)部分(fen)可(ke)用振動平臺來時(shi)(shi)效(xiao)(xiao)(xiao)）；7）并(bing)非工件(jian)所有部位(wei)的(de)(de)時(shi)(shi)效(xiao)(xiao)(xiao)效(xiao)(xiao)(xiao)果(guo)(guo)都一致。上海高級振動時(shi)(shi)效(xiao)(xiao)(xiao)效(xiao)(xiao)(xiao)果(guo)(guo)好不(bu)好振動時(shi)(shi)效(xiao)(xiao)(xiao)設(she)備可(ke)以(yi)對不(bu)同類型的(de)(de)產品進行快速和(he)準確的(de)(de)振動測試。

盡管振(zhen)(zhen)動(dong)(dong)時(shi)(shi)效(xiao)(xiao)(xiao)有一(yi)些局限性但(dan)在部分行業和(he)部分材(cai)質(zhi)的(de)零件(jian)上(shang)的(de)時(shi)(shi)效(xiao)(xiao)(xiao)效(xiao)(xiao)(xiao)果還是(shi)非(fei)常明(ming)顯(xian)(xian)的(de)。隨著人們對振(zhen)(zhen)動(dong)(dong)時(shi)(shi)效(xiao)(xiao)(xiao)技術的(de)進一(yi)步(bu)了(le)解，可以(yi)逐步(bu)減小它的(de)局限現(xian)性。如(ru)通(tong)過對工(gong)件(jian)采取(qu)隔離，或錯開工(gong)作時(shi)(shi)間等(deng)辦法可降低時(shi)(shi)效(xiao)(xiao)(xiao)的(de)噪(zao)聲；對于部分不(bu)適用(yong)(yong)激振(zhen)(zhen)器進行時(shi)(shi)效(xiao)(xiao)(xiao)處(chu)理(li)的(de)可通(tong)過振(zhen)(zhen)動(dong)(dong)平臺來進時(shi)(shi)效(xiao)(xiao)(xiao)處(chu)理(li)；以(yi)及(ji)對相關工(gong)藝人員(yuan)進行培訓的(de)方法等(deng)等(deng)，到(dao)目(mu)前為止我國已(yi)有數(shu)千家機(ji)械(xie)廠在使用(yong)(yong)振(zhen)(zhen)動(dong)(dong)時(shi)(shi)效(xiao)(xiao)(xiao)。正是(shi)由于振(zhen)(zhen)動(dong)(dong)時(shi)(shi)效(xiao)(xiao)(xiao)技術的(de)不(bu)斷發展、經(jing)濟效(xiao)(xiao)(xiao)果日益明(ming)顯(xian)(xian)，才(cai)使其應用(yong)(yong)范(fan)圍不(bu)斷擴(kuo)大。在機(ji)械(xie)制造、航空、化工(gong)器械(xie)、動(dong)(dong)力機(ji)械(xie)、造船等(deng)行業中，鑄(zhu)件(jian)、鍛件(jian)、焊(han)接件(jian)及(ji)有色合(he)金等(deng)材(cai)料制造的(de)各(ge)類零件(jian)均(jun)成功地采用(yong)(yong)了(le)振(zhen)(zhen)動(dong)(dong)時(shi)(shi)效(xiao)(xiao)(xiao)。振(zhen)(zhen)動(dong)(dong)時(shi)(shi)效(xiao)(xiao)(xiao)去應力已(yi)越來越受到(dao)各(ge)方面的(de)重視，其應用(yong)(yong)領(ling)域也(ye)越來越廣(guang)闊。

概括起來(lai)(lai)講，振(zhen)動(dong)(dong)(dong)(dong)時(shi)(shi)(shi)效的(de)(de)(de)工(gong)(gong)(gong)(gong)藝(yi)過程(cheng)分幾步(bu)(bu)進(jin)行(xing)：一(yi)步(bu)(bu)：首先用彈性橡膠墊將(jiang)要(yao)時(shi)(shi)(shi)效處(chu)理的(de)(de)(de)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)在其節線附近支撐起來(lai)(lai)，并(bing)(bing)將(jiang)激(ji)振(zhen)器用弓形卡(ka)(ka)具卡(ka)(ka)緊在工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)振(zhen)動(dong)(dong)(dong)(dong)時(shi)(shi)(shi)的(de)(de)(de)波峰處(chu)，將(jiang)測(ce)(ce)試(shi)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)振(zhen)動(dong)(dong)(dong)(dong)情況的(de)(de)(de)傳感器用磁坐吸(xi)緊在工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)上，并(bing)(bing)用電纜線將(jiang)激(ji)振(zhen)器、傳感器和(he)控制器連(lian)接起來(lai)(lai)，這(zhe)(zhe)一(yi)步(bu)(bu)又(you)(you)稱為準備過程(cheng)。第二(er)步(bu)(bu)：振(zhen)動(dong)(dong)(dong)(dong)時(shi)(shi)(shi)效設備以(yi)掃(sao)(sao)描(miao)的(de)(de)(de)方式自動(dong)(dong)(dong)(dong)檢測(ce)(ce)出被時(shi)(shi)(shi)效處(chu)理工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)的(de)(de)(de)固(gu)有共振(zhen)頻(pin)率和(he)應(ying)(ying)該給工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)振(zhen)動(dong)(dong)(dong)(dong)能量(liang)的(de)(de)(de)大小，這(zhe)(zhe)一(yi)步(bu)(bu)又(you)(you)稱為振(zhen)前掃(sao)(sao)描(miao)。第三步(bu)(bu)：振(zhen)動(dong)(dong)(dong)(dong)時(shi)(shi)(shi)效設備以(yi)第二(er)步(bu)(bu)測(ce)(ce)得參數為依據(ju)，自動(dong)(dong)(dong)(dong)確定出對(dui)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)進(jin)行(xing)振(zhen)動(dong)(dong)(dong)(dong)處(chu)理的(de)(de)(de)振(zhen)動(dong)(dong)(dong)(dong)頻(pin)率，并(bing)(bing)對(dui)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)進(jin)行(xing)振(zhen)動(dong)(dong)(dong)(dong)時(shi)(shi)(shi)效處(chu)理，在處(chu)理過程(cheng)中隨時(shi)(shi)(shi)檢測(ce)(ce)振(zhen)動(dong)(dong)(dong)(dong)參數和(he)工(gong)(gong)(gong)(gong)件(jian)(jian)(jian)(jian)(jian)(jian)殘余(yu)應(ying)(ying)力(li)的(de)(de)(de)變化，而(er)殘余(yu)應(ying)(ying)力(li)不(bu)再消除時(shi)(shi)(shi)即適(shi)時(shi)(shi)(shi)停止處(chu)理過程(cheng)，這(zhe)(zhe)一(yi)步(bu)(bu)又(you)(you)稱為振(zhen)動(dong)(dong)(dong)(dong)處(chu)理過程(cheng)。振(zhen)動(dong)(dong)(dong)(dong)時(shi)(shi)(shi)效設備可(ke)以(yi)對(dui)產(chan)品進(jin)行(xing)隨機振(zhen)動(dong)(dong)(dong)(dong)、正弦振(zhen)動(dong)(dong)(dong)(dong)等(deng)不(bu)同類型的(de)(de)(de)振(zhen)動(dong)(dong)(dong)(dong)測(ce)(ce)試(shi)。

根據(ju)振(zhen)動時(shi)(shi)(shi)(shi)效(xiao)(xiao)(xiao)(xiao)(xiao)過程(cheng)中繪出(chu)的(de)(de)加速度(du)-時(shi)(shi)(shi)(shi)間時(shi)(shi)(shi)(shi)效(xiao)(xiao)(xiao)(xiao)(xiao)曲(qu)線(xian)(xian)(xian)，評(ping)(ping)定(ding)振(zhen)動時(shi)(shi)(shi)(shi)效(xiao)(xiao)(xiao)(xiao)(xiao)獲(huo)得(de)實際(ji)效(xiao)(xiao)(xiao)(xiao)(xiao)果。目前(qian)各大標準(zhun)對參數(shu)曲(qu)線(xian)(xian)(xian)觀測(ce)法的(de)(de)參數(shu)設置及(ji)評(ping)(ping)測(ce)指標基本一致，以(yi)GB/T 25712-2010 《振(zhen)動時(shi)(shi)(shi)(shi)效(xiao)(xiao)(xiao)(xiao)(xiao)工(gong)藝參數(shu)選擇(ze)及(ji)效(xiao)(xiao)(xiao)(xiao)(xiao)果評(ping)(ping)定(ding)方法》為例(li)，參數(shu)曲(qu)線(xian)(xian)(xian)觀測(ce)法評(ping)(ping)價方法具(ju)體為：當與時(shi)(shi)(shi)(shi)效(xiao)(xiao)(xiao)(xiao)(xiao)頻(pin)率(lv)相(xiang)關的(de)(de)曲(qu)線(xian)(xian)(xian)出(chu)現(xian)下(xia)列情況之(zhi)一時(shi)(shi)(shi)(shi)，即可(ke)判(pan)定(ding)該時(shi)(shi)(shi)(shi)效(xiao)(xiao)(xiao)(xiao)(xiao)頻(pin)率(lv)的(de)(de)振(zhen)型有效(xiao)(xiao)(xiao)(xiao)(xiao)區覆蓋的(de)(de)工(gong)件區域已達到了(le)時(shi)(shi)(shi)(shi)效(xiao)(xiao)(xiao)(xiao)(xiao)效(xiao)(xiao)(xiao)(xiao)(xiao)果;a) a—t 曲(qu)線(xian)(xian)(xian)上升后(hou)變(bian)平(ping);b) a—t 曲(qu)線(xian)(xian)(xian)上升后(hou)下(xia)降(jiang)然(ran)后(hou)變(bian)平(ping);c)振(zhen)后(hou)a—n曲(qu)線(xian)(xian)(xian)加速度(du)峰值比振(zhen)前(qian)升高(gao);d)振(zhen)后(hou)a—n曲(qu)線(xian)(xian)(xian)的(de)(de)共(gong)振(zhen)頻(pin)率(lv)比振(zhen)前(qian)降(jiang)低;e)振(zhen)后(hou)a—n曲(qu)線(xian)(xian)(xian)的(de)(de)帶寬比振(zhen)前(qian)變(bian)窄(zhai);f)振(zhen)后(hou)a—n曲(qu)線(xian)(xian)(xian)的(de)(de)共(gong)振(zhen)峰有裂(lie)變(bian)現(xian)象發生(sheng);g)n—t 曲(qu)線(xian)(xian)(xian)下(xia)降(jiang)后(hou)變(bian)平(ping)。振(zhen)動時(shi)(shi)(shi)(shi)效(xiao)(xiao)(xiao)(xiao)(xiao)的(de)(de)研究(jiu)可(ke)以(yi)為材料和結構的(de)(de)安(an)全性評(ping)(ping)估和風(feng)險(xian)管理(li)提(ti)供(gong)重要依據(ju)。蘇州不銹鋼(gang)振(zhen)動時(shi)(shi)(shi)(shi)效(xiao)(xiao)(xiao)(xiao)(xiao)設備哪(na)家專(zhuan)業(ye)

振動(dong)時效是利用(yong)共振的原(yuan)理，在激(ji)振器的周期性外力作用(yong)下，施加給構件的一個動(dong)應力。蘇州(zhou)不銹鋼振動(dong)時效設備哪家專業(ye)

振(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)(dong)(dong)(dong)時效可(ke)(ke)以解釋為一個閉環控(kong)(kong)(kong)制(zhi)(zhi)的(de)(de)(de)“激(ji)(ji)(ji)勵-響應(ying)”振(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)(dong)(dong)(dong)體系，如圖所示。常用的(de)(de)(de)“激(ji)(ji)(ji)勵源”（激(ji)(ji)(ji)振(zhen)(zhen)(zhen)(zhen)(zhen)器）是一個有偏(pian)(pian)心質量的(de)(de)(de)電機，偏(pian)(pian)心塊(kuai)的(de)(de)(de)旋(xuan)轉(zhuan)產(chan)生激(ji)(ji)(ji)振(zhen)(zhen)(zhen)(zhen)(zhen)力(li)，可(ke)(ke)通(tong)(tong)過(guo)調節偏(pian)(pian)心距改(gai)變激(ji)(ji)(ji)振(zhen)(zhen)(zhen)(zhen)(zhen)力(li)大小。激(ji)(ji)(ji)振(zhen)(zhen)(zhen)(zhen)(zhen)器與工(gong)件(jian)通(tong)(tong)過(guo)C型(xing)夾剛性固定(ding)。用橡膠墊(dian)支(zhi)撐工(gong)件(jian)，保證工(gong)件(jian)在振(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)(dong)(dong)(dong)時效過(guo)程(cheng)中(zhong)呈“彈性懸浮”狀況。振(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)(dong)(dong)(dong)過(guo)程(cheng)中(zhong)工(gong)件(jian)的(de)(de)(de)“響應(ying)”（振(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)(dong)(dong)(dong)加(jia)速(su)度(du)(du)(du)(du)）通(tong)(tong)過(guo)加(jia)速(su)度(du)(du)(du)(du)傳(chuan)感(gan)器傳(chuan)遞回控(kong)(kong)(kong)制(zhi)(zhi)系統。控(kong)(kong)(kong)制(zhi)(zhi)系統是振(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)(dong)(dong)(dong)時效設(she)(she)備的(de)(de)(de)關鍵，通(tong)(tong)過(guo)檢測振(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)(dong)(dong)(dong)加(jia)速(su)度(du)(du)(du)(du)的(de)(de)(de)變化來控(kong)(kong)(kong)制(zhi)(zhi)偏(pian)(pian)心電機的(de)(de)(de)旋(xuan)轉(zhuan)速(su)度(du)(du)(du)(du)和振(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)(dong)(dong)(dong)持續時間。通(tong)(tong)過(guo)檢測系統的(de)(de)(de)振(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)(dong)(dong)(dong)加(jia)速(su)度(du)(du)(du)(du)幅(fu)度(du)(du)(du)(du)，找到系統的(de)(de)(de)共(gong)振(zhen)(zhen)(zhen)(zhen)(zhen)頻率，保證系統在共(gong)振(zhen)(zhen)(zhen)(zhen)(zhen)或亞共(gong)振(zhen)(zhen)(zhen)(zhen)(zhen)狀態下振(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)(dong)(dong)(dong)，并獲得(de)足(zu)夠大的(de)(de)(de)振(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)(dong)(dong)(dong)動(dong)(dong)(dong)(dong)(dong)(dong)應(ying)力(li)。振(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)(dong)(dong)(dong)時效處(chu)理(li)結束后，可(ke)(ke)打印出振(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)(dong)(dong)(dong)過(guo)程(cheng)的(de)(de)(de)振(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)(dong)(dong)(dong)加(jia)速(su)度(du)(du)(du)(du)、轉(zhuan)速(su)和振(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)(dong)(dong)(dong)處(chu)理(li)時間的(de)(de)(de)關系圖，用來評(ping)定(ding)振(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)(dong)(dong)(dong)時效的(de)(de)(de)工(gong)藝效果。蘇(su)州不銹鋼振(zhen)(zhen)(zhen)(zhen)(zhen)動(dong)(dong)(dong)(dong)(dong)(dong)時效設(she)(she)備哪(na)家專業

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