帶式輸送機是(shi)煤(mei)礦(kuang)采(cai)選(xuan)行(xing)業(ye)最(zui)主(zhu)要(yao)的(de)運(yun)輸(shu)設(she)備(bei)之(zhi)一(yi)，它(ta)擔(dan)負(fu)著(zhe)礦(kuang)井(jing)煤(mei)炭(tan)和(he)矸(gan)石(shi)的(de)運(yun)輸(shu)任(ren)務(wu)，是(shi)生(sheng)產(chan)係(xi)統(tong)的(de)大(da)動(dong)脈(mai)。隨(sui)著(zhe)煤(mei)炭(tan)工(gong)業(ye)的(de)迅(xun)速(su)發(fa)展(zhan)，煤(mei)礦(kuang)井(jing)下(xia)運(yun)輸(shu)係(xi)統(tong)發(fa)生(sheng)了(le)很(hen)大(da)變(bian)化(hua)，特(te)別(bie)是(shi)最(zui)近(jin)幾(ji)年(nian)，礦(kuang)井(jing)井(jing)型(xing)向(xiang)大(da)型(xing)化(hua)發(fa)展(zhan)，在(zai)我(wo)國(guo)大(da)功(gong)率(lv)、智(zhi)能(neng)化(hua)的(de)皮(pi)帶(dai)機(ji)卻(que)以(yi)進(jin)口(kou)為(wei)主(zhu)，而(er)進(jin)口(kou)皮(pi)帶(dai)機(ji)的(de)價(jia)格(ge)較(jiao)高(gao)，同(tong)時(shi)運(yun)行(xing)代(dai)價(jia)較(jiao)大(da)。隻(zhi)要(yao)對(dui)有(you)的(de)皮(pi)帶(dai)機(ji)稍(shao)加(jia)技(ji)術(shu)改(gai)造(zao)，增(zeng)加(jia)變(bian)頻(pin)軟(ruan)起(qi)軟(ruan)停(ting)和(he)綜(zong)合(he)保(bao)護(hu)控(kong)製(zhi)功(gong)能(neng)，就(jiu)能(neng)使(shi)帶(dai)式(shi)輸(shu)送(song)機(ji)啟(qi)動(dong)特(te)性(xing)平(ping)穩(wen)，而(er)且(qie)也(ye)極(ji)大(da)降(jiang)低(di)了(le)皮(pi)帶(dai)機(ji)的(de)維(wei)護(hu)檢(jian)修(xiu)量(liang)，同(tong)時(shi)節(jie)能(neng)效(xiao)果(guo)明(ming)顯(xian)。因(yin)此(ci)說(shuo)采(cai)用(yong)變(bian)頻(pin)技(ji)術(shu)對(dui)帶(dai)式(shi)輸(shu)送(song)機(ji)進(jin)行(xing)改(gai)造(zao)，不(bu)但(dan)有(you)利(li)於(yu)降(jiang)低(di)企(qi)業(ye)生(sheng)產(chan)成(cheng)本(ben)，提(ti)高(gao)企(qi)業(ye)經(jing)濟(ji)效(xiao)益(yi)，還(hai)符(fu)合(he)國(guo)家(jia)建(jian)設(she)節(jie)約(yue)型(xing)社(she)會(hui)的(de)主(zhu)題(ti)。
1、變頻調速的性能特點
(l)實現可控啟停、減少機械衝擊。
變頻調速能在零速啟動，並能按照用戶的需要進行光滑地加速，其加速曲線也可以選擇（直線加速、S形加速或者自動加速）。因此啟動衝擊小，設備的使用壽命長。
(2)調節範圍寬、滿足多種速度運行要求。
由電機轉速公式n=60 f（l-s）/p可知，轉速n與頻率f成正比，改變頻率f即可改變電動機的轉速，當頻率f在0 - 50Hzdefanweineibianhuashi，diandongjizhuansutiaojiefanweifeichangkuan。youyubianpinqideshuchupinlvfanweigengda，suoyibianpintiaosuzhuangzhitiaojiededianji，zhuansufanweigengkuan，nenggoujiaohaodemanzushebeiyunxingdeduozhongsuduyaoqiu。
(3)可逆運行簡單，負力製動可靠。
zaibianpinqikongzhizhongshixiankeniyunxingkongzhizhixutongguobianpinqigaibianshuchudianyadexiangxujike，keniyunxingfeichangjiandan，tongshimuqiansixiangxianyunxingdainengliangzidonghuikuijishudebianpinqiyijingxiangdangchengshu，fuliyunxingshi，xitongzidongjinruhuikuizhidongzhuangtai，shiyunxinggengjiakekao。
(4)控製精度高、功率平衡性好。
目前煤礦井下用變頻器大多使用無速度傳感器矢量控製方式．該控製方式可以分別對異步電動機的磁通和轉矩電流進行檢測、控製，並自動改變電壓和頻率，使指令值和檢測實際值達到一致，該矢量控製方式大大提升了靜態精度和動態品質，使控製精度、功率平衡性都大大提高。總之，交流變頻調速在理論上能夠較好的滿足帶式輸送機的特殊運行性能要求。
2、變頻技術在皮帶機中發揮的作用
目前在煤礦使用的是BPJ型礦用隔爆兼本質安全型交流變頻器，該隔爆變頻器采用r無速度傳感器的矢量控製，可根據現場實際工況進行調整，對皮帶機實現軟起動、ruantingzhiheyunxingguochengkongzhi，queshibaozhenglexitongdekekaoxing。zaipidaijiqidongguochengzhong，ruguobujiasheruanqidongzhuangzhi，guodadezhanglibojiyiyinqipidaibeisiduan。erqie，gongpinqidongshi，qidongdianliuweidianjiedingdianliude4～7倍(bei)。大(da)的(de)起(qi)動(dong)電(dian)流(liu)會(hui)在(zai)起(qi)動(dong)過(guo)程(cheng)中(zhong)產(chan)生(sheng)衝(chong)擊(ji)，引(yin)起(qi)電(dian)機(ji)內(nei)部(bu)機(ji)械(xie)應(ying)力(li)和(he)熱(re)應(ying)力(li)發(fa)生(sheng)變(bian)化(hua)，對(dui)機(ji)械(xie)部(bu)分(fen)造(zao)成(cheng)嚴(yan)重(zhong)磨(mo)損(sun)甚(shen)至(zhi)損(sun)壞(huai)。同(tong)時(shi)，大(da)的(de)起(qi)動(dong)電(dian)流(liu)還(hai)將(jiang)引(yin)起(qi)電(dian)網(wang)電(dian)壓(ya)下(xia)降(jiang)，影(ying)響(xiang)其(qi)它(ta)設(she)備(bei)的(de)正(zheng)常(chang)運(yun)行(xing)。如(ru)今(jin)煤(mei)礦(kuang)采(cai)用(yong)的(de)欽(qin)起(qi)動(dong)裝(zhuang)置(zhi)絕(jue)大(da)部(bu)分(fen)是(shi)液(ye)力(li)耦(ou)合(he)器(qi)。與(yu)變(bian)頻(pin)器(qi)驅(qu)動(dong)相(xiang)比(bi)，它(ta)具(ju)有(you)明(ming)顯(xian)的(de)劣(lie)勢(shi)：(l)采用液力耦合器時，電機必須先空載起動；(2)采用皮帶機的加載時間較短溶易引起皮帶張力變化，因此對皮帶的強度要求較高；(3)yibandepidaijidoushichangjulidayunliang，tongchangdoushiduodianjiqudong，caiyongyeliouheqiqudong，hennanjiejueduodianjiqudongshidegonglvpingheng。zaidianjiqidongshi，bianpintiaosuruanqidongzhuangzhitongguogaibianjiaoliudianpinlvlaigaibiandianjizhuansu'anxitongtiaodingshijianyunsushengzhiyunxingsudu，qidongpingwenkekao，duizhengjichongjixiao，keyanchangjiaodaideshiyongshouming，jiangdipidaideqiangdudengji，yedadajianshaolepidaijixitongjixiebufendejianxiuliang。
3、變頻技術在煤礦帶式輸送機上的應用
(1)實shi現xian了le皮pi帶dai機ji平ping穩wen的de重zhong載zai起qi動dong。由you幹gan煤mei礦kuang生sheng產chan的de特te殊shu性xing，皮pi帶dai機ji在zai原yuan煤mei運yun輸shu過guo程cheng中zhong時shi刻ke都dou有you可ke能neng重zhong載zai停ting機ji，然ran後hou再zai重zhong新xin啟qi動dong。皮pi帶dai機ji傳chuan統tong的de控kong製zhi方fang式shi有you時shi不bu具ju有you重zhong載zai起qi動dong的de能neng力li，這zhe就jiu需xu要yao人ren工gong減jian少shao皮pi帶dai機ji上shang的de負fu載zai再zai重zhong新xin啟qi動dong，延yan誤wu了le原yuan煤mei運yun輸shu的de時shi間jian，同tong時shi也ye給gei皮pi帶dai機ji巷xiang的de管guan理li帶dai來lai額e外wai的de工gong作zuo量liang，增zeng加jia了le維wei護hu人ren員yuan的de勞lao動dong量liang。采cai用yong隔ge爆bao變bian頻pin器qi的de無wu速su度du傳chuan感gan器qi矢shi量liang控kong製zhi方fang式shi，自zi動dong轉zhuan矩ju補bu償chang功gong能neng，使shi皮pi帶dai機ji重zhong載zai起qi動dong實shi現xian了le低di速su大da轉zhuan矩ju。最zui大da轉zhuan矩ju可ke達da到dao倍bei的de額e定ding轉zhuan矩ju，從cong而er適shi用yong於yu皮pi帶dai機ji重zhong載zai起qi動dong。因yin此ci說shuo皮pi帶dai機ji增zeng加jia速su度du調tiao整zheng功gong能neng，可ke根gen據ju它ta煤mei量liang的de大da小xiao來lai調tiao節jie整zheng機ji運yun行xing速su度du，不bu僅jin能neng使shi重zhong載zai平ping穩wen起qi動dong效xiao果guo明ming顯xian，並bing可ke輕qing鬆song實shi現xian驗yan帶dai功gong能neng，從cong而er使shi整zheng個ge皮pi帶dai機ji係xi統tong及ji驅qu動dong電dian機ji的de故gu障zhang明ming顯xian減jian少shao，托tuo輥gun及ji滾gun筒tong的de壽shou命ming延yan長chang，實shi現xian了le皮pi帶dai機ji多duo電dian機ji驅qu動dong時shi的de功gong率lv平ping衡heng。
(2)實現了帶式輸送機的軟啟動和軟停止。煤礦帶式輸送機傳統的起動、tingzhishunjianhuichanshenghendadechongjili，duipidaijidegezhuandongbuweijipidaidejietoudouyoujiaodasunhao，tongshiqidongshichanshengdedadianliuduidianwangyeyoujiaodadechongji。ercaiyonggebaojianbenanbianpintiaosuzhuangzhikeyigenjupidaijichangduhefuzaidaxiao，renweishezhixitongqidongshijianhetingzhishijian，congershiqidongshidejiasuduhetingzhishidejiansudubianweiketiaode，buguanfuhedaxiaojunkeshixianpingwenqidong。yincishuoyunyongbianpinqideruanqidonggongneng，jiangdianjideruanqidonghepidaijideruanqidongheerweiyi，tongguodianjidemansuqidong，daidongpidaijihuanmanqidong，jiangpidaineibuzhucundenenglianghuanmanshifang，shipidaijizaiqidongguochengzhongxingchengdezhanglibojixiao，jihuduipidaibuzaochengsunhai．也延長了設備的使用壽命，降低了後期的人力和物力的投入。
(3)jieyuenengyuan。chuantongdepidaijiqudongzhuangzhiyibandoushiyongyeliouheqiduidianjijinxingtiaosu，dangduodianjituodongshi，yeyongtalaipinghengdiandongjidegonglvfenpei。shiyongbianpinqihouyeliouheqikeyongmeihuaxingdanxinglianzhouqihuodanxingbangshaolianzhouqilaitidai，jianhualequdongzhuangzhidejiegou，jianshaoleshiguyinhuan，erqieyetidechuandongxiaolvbizhijieyinglianjiedechuandongxiaolvyaodixuduo，yincishuocaiyongbianpinqiqudonghou，xitongzongdechuandixiaolvketigao5%～10%。在變頻運行中，在運煤量不大的下或空載的情況下，可將皮帶機的運行速度降低，也可節約一部分電量。
4、結語
總(zong)之(zhi)，實(shi)踐(jian)證(zheng)明(ming)采(cai)用(yong)變(bian)頻(pin)器(qi)來(lai)改(gai)造(zao)傳(chuan)統(tong)的(de)帶(dai)式(shi)輸(shu)送(song)機(ji)驅(qu)動(dong)係(xi)統(tong)，不(bu)僅(jin)技(ji)術(shu)先(xian)進(jin)，而(er)且(qie)能(neng)夠(gou)創(chuang)造(zao)巨(ju)大(da)的(de)經(jing)濟(ji)效(xiao)益(yi)和(he)良(liang)好(hao)的(de)社(she)會(hui)效(xiao)益(yi)。隔(ge)爆(bao)變(bian)頻(pin)器(qi)以(yi)其(qi)特(te)有(you)的(de)軟(ruan)啟(qi)動(dong)特(te)性(xing)，較(jiao)高(gao)的(de)性(xing)價(jia)比(bi)，大(da)大(da)提(ti)高(gao)了(le)皮(pi)帶(dai)機(ji)的(de)可(ke)靠(kao)性(xing)，降(jiang)低(di)了(le)機(ji)械(xie)係(xi)統(tong)損(sun)耗(hao)，減(jian)少(shao)了(le)運(yun)輸(shu)係(xi)統(tong)的(de)維(wei)護(hu)量(liang)，且(qie)節(jie)能(neng)明(ming)顯(xian)。因(yin)此(ci)說(shuo)應(ying)用(yong)變(bian)頻(pin)技(ji)術(shu)的(de)電(dian)機(ji)驅(qu)動(dong)係(xi)統(tong)將(jiang)成(cheng)為(wei)井(jing)下(xia)皮(pi)帶(dai)機(ji)拖(tuo)動(dong)的(de)發(fa)展(zhan)方(fang)向(xiang)。
1、變頻調速的性能特點
(l)實現可控啟停、減少機械衝擊。
變頻調速能在零速啟動，並能按照用戶的需要進行光滑地加速，其加速曲線也可以選擇（直線加速、S形加速或者自動加速）。因此啟動衝擊小，設備的使用壽命長。
(2)調節範圍寬、滿足多種速度運行要求。
由電機轉速公式n=60 f（l-s）/p可知，轉速n與頻率f成正比，改變頻率f即可改變電動機的轉速，當頻率f在0 - 50Hzdefanweineibianhuashi，diandongjizhuansutiaojiefanweifeichangkuan。youyubianpinqideshuchupinlvfanweigengda，suoyibianpintiaosuzhuangzhitiaojiededianji，zhuansufanweigengkuan，nenggoujiaohaodemanzushebeiyunxingdeduozhongsuduyaoqiu。
(3)可逆運行簡單，負力製動可靠。
zaibianpinqikongzhizhongshixiankeniyunxingkongzhizhixutongguobianpinqigaibianshuchudianyadexiangxujike，keniyunxingfeichangjiandan，tongshimuqiansixiangxianyunxingdainengliangzidonghuikuijishudebianpinqiyijingxiangdangchengshu，fuliyunxingshi，xitongzidongjinruhuikuizhidongzhuangtai，shiyunxinggengjiakekao。
(4)控製精度高、功率平衡性好。
目前煤礦井下用變頻器大多使用無速度傳感器矢量控製方式．該控製方式可以分別對異步電動機的磁通和轉矩電流進行檢測、控製，並自動改變電壓和頻率，使指令值和檢測實際值達到一致，該矢量控製方式大大提升了靜態精度和動態品質，使控製精度、功率平衡性都大大提高。總之，交流變頻調速在理論上能夠較好的滿足帶式輸送機的特殊運行性能要求。
2、變頻技術在皮帶機中發揮的作用
目前在煤礦使用的是BPJ型礦用隔爆兼本質安全型交流變頻器，該隔爆變頻器采用r無速度傳感器的矢量控製，可根據現場實際工況進行調整，對皮帶機實現軟起動、ruantingzhiheyunxingguochengkongzhi，queshibaozhenglexitongdekekaoxing。zaipidaijiqidongguochengzhong，ruguobujiasheruanqidongzhuangzhi，guodadezhanglibojiyiyinqipidaibeisiduan。erqie，gongpinqidongshi，qidongdianliuweidianjiedingdianliude4～7倍(bei)。大(da)的(de)起(qi)動(dong)電(dian)流(liu)會(hui)在(zai)起(qi)動(dong)過(guo)程(cheng)中(zhong)產(chan)生(sheng)衝(chong)擊(ji)，引(yin)起(qi)電(dian)機(ji)內(nei)部(bu)機(ji)械(xie)應(ying)力(li)和(he)熱(re)應(ying)力(li)發(fa)生(sheng)變(bian)化(hua)，對(dui)機(ji)械(xie)部(bu)分(fen)造(zao)成(cheng)嚴(yan)重(zhong)磨(mo)損(sun)甚(shen)至(zhi)損(sun)壞(huai)。同(tong)時(shi)，大(da)的(de)起(qi)動(dong)電(dian)流(liu)還(hai)將(jiang)引(yin)起(qi)電(dian)網(wang)電(dian)壓(ya)下(xia)降(jiang)，影(ying)響(xiang)其(qi)它(ta)設(she)備(bei)的(de)正(zheng)常(chang)運(yun)行(xing)。如(ru)今(jin)煤(mei)礦(kuang)采(cai)用(yong)的(de)欽(qin)起(qi)動(dong)裝(zhuang)置(zhi)絕(jue)大(da)部(bu)分(fen)是(shi)液(ye)力(li)耦(ou)合(he)器(qi)。與(yu)變(bian)頻(pin)器(qi)驅(qu)動(dong)相(xiang)比(bi)，它(ta)具(ju)有(you)明(ming)顯(xian)的(de)劣(lie)勢(shi)：(l)采用液力耦合器時，電機必須先空載起動；(2)采用皮帶機的加載時間較短溶易引起皮帶張力變化，因此對皮帶的強度要求較高；(3)yibandepidaijidoushichangjulidayunliang，tongchangdoushiduodianjiqudong，caiyongyeliouheqiqudong，hennanjiejueduodianjiqudongshidegonglvpingheng。zaidianjiqidongshi，bianpintiaosuruanqidongzhuangzhitongguogaibianjiaoliudianpinlvlaigaibiandianjizhuansu'anxitongtiaodingshijianyunsushengzhiyunxingsudu，qidongpingwenkekao，duizhengjichongjixiao，keyanchangjiaodaideshiyongshouming，jiangdipidaideqiangdudengji，yedadajianshaolepidaijixitongjixiebufendejianxiuliang。
3、變頻技術在煤礦帶式輸送機上的應用
(1)實shi現xian了le皮pi帶dai機ji平ping穩wen的de重zhong載zai起qi動dong。由you幹gan煤mei礦kuang生sheng產chan的de特te殊shu性xing，皮pi帶dai機ji在zai原yuan煤mei運yun輸shu過guo程cheng中zhong時shi刻ke都dou有you可ke能neng重zhong載zai停ting機ji，然ran後hou再zai重zhong新xin啟qi動dong。皮pi帶dai機ji傳chuan統tong的de控kong製zhi方fang式shi有you時shi不bu具ju有you重zhong載zai起qi動dong的de能neng力li，這zhe就jiu需xu要yao人ren工gong減jian少shao皮pi帶dai機ji上shang的de負fu載zai再zai重zhong新xin啟qi動dong，延yan誤wu了le原yuan煤mei運yun輸shu的de時shi間jian，同tong時shi也ye給gei皮pi帶dai機ji巷xiang的de管guan理li帶dai來lai額e外wai的de工gong作zuo量liang，增zeng加jia了le維wei護hu人ren員yuan的de勞lao動dong量liang。采cai用yong隔ge爆bao變bian頻pin器qi的de無wu速su度du傳chuan感gan器qi矢shi量liang控kong製zhi方fang式shi，自zi動dong轉zhuan矩ju補bu償chang功gong能neng，使shi皮pi帶dai機ji重zhong載zai起qi動dong實shi現xian了le低di速su大da轉zhuan矩ju。最zui大da轉zhuan矩ju可ke達da到dao倍bei的de額e定ding轉zhuan矩ju，從cong而er適shi用yong於yu皮pi帶dai機ji重zhong載zai起qi動dong。因yin此ci說shuo皮pi帶dai機ji增zeng加jia速su度du調tiao整zheng功gong能neng，可ke根gen據ju它ta煤mei量liang的de大da小xiao來lai調tiao節jie整zheng機ji運yun行xing速su度du，不bu僅jin能neng使shi重zhong載zai平ping穩wen起qi動dong效xiao果guo明ming顯xian，並bing可ke輕qing鬆song實shi現xian驗yan帶dai功gong能neng，從cong而er使shi整zheng個ge皮pi帶dai機ji係xi統tong及ji驅qu動dong電dian機ji的de故gu障zhang明ming顯xian減jian少shao，托tuo輥gun及ji滾gun筒tong的de壽shou命ming延yan長chang，實shi現xian了le皮pi帶dai機ji多duo電dian機ji驅qu動dong時shi的de功gong率lv平ping衡heng。
(2)實現了帶式輸送機的軟啟動和軟停止。煤礦帶式輸送機傳統的起動、tingzhishunjianhuichanshenghendadechongjili，duipidaijidegezhuandongbuweijipidaidejietoudouyoujiaodasunhao，tongshiqidongshichanshengdedadianliuduidianwangyeyoujiaodadechongji。ercaiyonggebaojianbenanbianpintiaosuzhuangzhikeyigenjupidaijichangduhefuzaidaxiao，renweishezhixitongqidongshijianhetingzhishijian，congershiqidongshidejiasuduhetingzhishidejiansudubianweiketiaode，buguanfuhedaxiaojunkeshixianpingwenqidong。yincishuoyunyongbianpinqideruanqidonggongneng，jiangdianjideruanqidonghepidaijideruanqidongheerweiyi，tongguodianjidemansuqidong，daidongpidaijihuanmanqidong，jiangpidaineibuzhucundenenglianghuanmanshifang，shipidaijizaiqidongguochengzhongxingchengdezhanglibojixiao，jihuduipidaibuzaochengsunhai．也延長了設備的使用壽命，降低了後期的人力和物力的投入。
(3)jieyuenengyuan。chuantongdepidaijiqudongzhuangzhiyibandoushiyongyeliouheqiduidianjijinxingtiaosu，dangduodianjituodongshi，yeyongtalaipinghengdiandongjidegonglvfenpei。shiyongbianpinqihouyeliouheqikeyongmeihuaxingdanxinglianzhouqihuodanxingbangshaolianzhouqilaitidai，jianhualequdongzhuangzhidejiegou，jianshaoleshiguyinhuan，erqieyetidechuandongxiaolvbizhijieyinglianjiedechuandongxiaolvyaodixuduo，yincishuocaiyongbianpinqiqudonghou，xitongzongdechuandixiaolvketigao5%～10%。在變頻運行中，在運煤量不大的下或空載的情況下，可將皮帶機的運行速度降低，也可節約一部分電量。
4、結語
總(zong)之(zhi)，實(shi)踐(jian)證(zheng)明(ming)采(cai)用(yong)變(bian)頻(pin)器(qi)來(lai)改(gai)造(zao)傳(chuan)統(tong)的(de)帶(dai)式(shi)輸(shu)送(song)機(ji)驅(qu)動(dong)係(xi)統(tong)，不(bu)僅(jin)技(ji)術(shu)先(xian)進(jin)，而(er)且(qie)能(neng)夠(gou)創(chuang)造(zao)巨(ju)大(da)的(de)經(jing)濟(ji)效(xiao)益(yi)和(he)良(liang)好(hao)的(de)社(she)會(hui)效(xiao)益(yi)。隔(ge)爆(bao)變(bian)頻(pin)器(qi)以(yi)其(qi)特(te)有(you)的(de)軟(ruan)啟(qi)動(dong)特(te)性(xing)，較(jiao)高(gao)的(de)性(xing)價(jia)比(bi)，大(da)大(da)提(ti)高(gao)了(le)皮(pi)帶(dai)機(ji)的(de)可(ke)靠(kao)性(xing)，降(jiang)低(di)了(le)機(ji)械(xie)係(xi)統(tong)損(sun)耗(hao)，減(jian)少(shao)了(le)運(yun)輸(shu)係(xi)統(tong)的(de)維(wei)護(hu)量(liang)，且(qie)節(jie)能(neng)明(ming)顯(xian)。因(yin)此(ci)說(shuo)應(ying)用(yong)變(bian)頻(pin)技(ji)術(shu)的(de)電(dian)機(ji)驅(qu)動(dong)係(xi)統(tong)將(jiang)成(cheng)為(wei)井(jing)下(xia)皮(pi)帶(dai)機(ji)拖(tuo)動(dong)的(de)發(fa)展(zhan)方(fang)向(xiang)。
