KAF129R89減速機銘牌參數(shù)說明解讀含義：有關型號描述的詳細情況及其他信息可以參閱本業(yè)附件下載中的KAF129R89減速機選型樣本。

KAF129R89-Y4KW-4P-367-M5-270°

KAF/R：系列代號

129/89：減速機規(guī)格代號

Y：電機

4KW：電機功率

4P：電機級數(shù)

367：減速機傳動比

M5：減速機安裝位置

270°：接線盒位置直角減速機

KAF129R89減速機電機使用需知:

使用中電源電壓變動超過10%時，有可能燒毀電機，同時伴有出力扭力降低或異常；電機超負荷運行時有可能燒毀，請在運行初次測試電機電流是否在額定電流值內(nèi)。質(zhì)保：本公司同意在正常使用情況下，如有因零件瑕疵或制造不良發(fā)生損壞，可于出廠后一年半內(nèi)(18個月內(nèi))免費維修或以新品更換之；若因客戶使用不當，擅自加裝配件或自已變更機體等所造成之損壞維修，使用者應自行負擔零件維修費用；若超過質(zhì)保期產(chǎn)品需要維修的，我司將收取維修費用；自然天災或操作環(huán)境惡劣所造成之損壞，雖于保修期內(nèi)，恕難受理理賠;(5).若無法取得出貨日期證明時，以銘牌上制造日期為準；本公司對產(chǎn)品所負責任，不超過產(chǎn)品原初售價。齒輪減速電機

KAF129R89減速機電機剎車器不動作解決方法：

KAF129R89減速機電機維護和故障排除必須由專業(yè)人員用適當?shù)墓ぞ吆驮O備進行。前提：發(fā)生故障時，先對照如下目錄的故障排除表進行處理，不能自行處理的，請聯(lián)系當?shù)亟?jīng)銷商解決；本機故障，換用零部件或咨詢時，請將銘版上的參數(shù)確認后再進行聯(lián)系:完整型號、馬力、制造編號、生產(chǎn)序列號、規(guī)格與產(chǎn)品代碼等。二級減速機

KAF129R89減速電機型號：

YQKAF127R87-Y100M4，YQKAF127R87-Y112M4，YQKAF127R87-Y132M4，YQKAF127R87-Y160M4，YQKAF127RF87-Y100M4，YQKAF127RF87-Y112M4，YQKAF127RF87-Y11KWAF，YQKAF127RF87-Y132M4，YQKAF127RF87-Y15KWAF，YQKAF127RF87-Y160M4，YQKAF127RF87-Y2.2KWAF，YQKAF127RF87-Y3KWAF，YQKAF127RF87-Y4KWAF，YQKAF127RF87-Y5.5KWAF，YQKAF127RF87-Y7.5KWAF，YQKAF127RF87-YB100L4，YQKAF127RF87-YB112M4，YQKAF127RF87-YB132M4，YQKAF127RF87-YB160M4，YQKAF127RF87-YDP100L4，YQKAF127RF87-YDP112M4，YQKAF127RF87-YDP132M4，YQKAF127RF87-YDP160M4，YQKAF127RF87-YE100L4，YQKAF127RF87-YE112M4，YQKAF127RF87-YE132M4，YQKAF127RF87-YE160M4，YQKAF127RF87-YEJ100L4，YQKAF127RF87-YEJ112M4，YQKAF127RF87-YEJ132M4，YQKAF127RF87-YEJ160M4，YQKAF127RF87-YEJB100L4，YQKAF127RF87-YEJB112M4，YQKAF127RF87-YEJB132M4，YQKAF127RF87-YEJB160M4，YQKAF127RF87-YP100L4，YQKAF127RF87-YP112M4，YQKAF127RF87-YP132M4，YQKAF127RF87-YP160M4，YQKAF127RF87-YPB100L4，YQKAF127RF87-YPB112M4，YQKAF127RF87-YPB132M4，YQKAF127RF87-YPB160M4，YQKAF127RF87-YPE100L4，YQKAF127RF87-YPE112M4，YQKAF127RF87-YPE132M4，YQKAF127RF87-YPE160M4，YQKAF127RF87-YS100L4，YQKAF127RF87-YS112M4，YQKAF127RF87-YS132M4，YQKAF127RF87-YS160M4，YQKAF127RF87-YVB100L4，YQKAF127RF87-YVB112M4，YQKAF127RF87-YVB132M4，YQKAF127RF87-YVB160M4，YQKAF127RF87-YVP100L4，YQKAF127RF87-YVP112M4，YQKAF127RF87-YVP132M4，YQKAF127RF87-YVP160M4，YQKAF127RF87-YVPEJ100L4，YQKAF127RF87-YVPEJ112M4，YQKAF127RF87-YVPEJ132M4，YQKAF127RF87-YVPEJ160M4，AKAF127R87-Y100M4，AKAF127R87-Y112M4，AKAF127R87-Y132M4，AKAF127R87-Y160M4，AKAF127RF87-Y100M4，AKAF127RF87-Y112M4，AKAF127RF87-Y11KWAF，AKAF127RF87-Y132M4，AKAF127RF87-Y15KWAF，AKAF127RF87-Y160M4，AKAF127RF87-Y2.2KWAF，AKAF127RF87-Y3KWAF，AKAF127RF87-Y4KWAF，AKAF127RF87-Y5.5KWAF，AKAF127RF87-Y7.5KWAF，AKAF127RF87-YB100L4，AKAF127RF87-YB112M4，AKAF127RF87-YB132M4，AKAF127RF87-YB160M4，AKAF127RF87-YDP100L4，AKAF127RF87-YDP112M4，AKAF127RF87-YDP132M4，AKAF127RF87-YDP160M4，AKAF127RF87-YE100L4，AKAF127RF87-YE112M4，AKAF127RF87-YE132M4，AKAF127RF87-YE160M4，AKAF127RF87-YEJ100L4，AKAF127RF87-YEJ112M4，AKAF127RF87-YEJ132M4，AKAF127RF87-YEJ160M4，AKAF127RF87-YEJB100L4，AKAF127RF87-YEJB112M4，AKAF127RF87-YEJB132M4，AKAF127RF87-YEJB160M4，AKAF127RF87-YP100L4，AKAF127RF87-YP112M4，AKAF127RF87-YP132M4，AKAF127RF87-YP160M4，AKAF127RF87-YPB100L4，AKAF127RF87-YPB112M4，AKAF127RF87-YPB132M4，AKAF127RF87-YPB160M4，AKAF127RF87-YPE100L4，AKAF127RF87-YPE112M4，AKAF127RF87-YPE132M4，AKAF127RF87-YPE160M4，AKAF127RF87-YS100L4，AKAF127RF87-YS112M4，AKAF127RF87-YS132M4，AKAF127RF87-YS160M4，AKAF127RF87-YVB100L4，AKAF127RF87-YVB112M4，AKAF127RF87-YVB132M4，AKAF127RF87-YVB160M4，AKAF127RF87-YVP100L4，AKAF127RF87-YVP112M4，AKAF127RF87-YVP132M4，AKAF127RF87-YVP160M4，AKAF127RF87-YVPEJ100L4，AKAF127RF87-YVPEJ112M4，AKAF127RF87-YVPEJ132M4，AKAF127RF87-YVPEJ160M4，SKAF127R87-Y100M4，SKAF127R87-Y112M4，SKAF127R87-Y132M4，SKAF127R87-Y160M4，SKAF127RF87-Y100M4，SKAF127RF87-Y112M4，SKAF127RF87-Y11KWAF，SKAF127RF87-Y132M4，SKAF127RF87-Y15KWAF，SKAF127RF87-Y160M4，SKAF127RF87-Y2.2KWAF，SKAF127RF87-Y3KWAF，SKAF127RF87-Y4KWAF，SKAF127RF87-Y5.5KWAF，SKAF127RF87-Y7.5KWAF，SKAF127RF87-YB100L4，SKAF127RF87-YB112M4，SKAF127RF87-YB132M4，SKAF127RF87-YB160M4，SKAF127RF87-YDP100L4，SKAF127RF87-YDP112M4，SKAF127RF87-YDP132M4，SKAF127RF87-YDP160M4，SKAF127RF87-YE100L4，SKAF127RF87-YE112M4，SKAF127RF87-YE132M4，SKAF127RF87-YE160M4，SKAF127RF87-YEJ100L4，SKAF127RF87-YEJ112M4，SKAF127RF87-YEJ132M4，SKAF127RF87-YEJ160M4，SKAF127RF87-YEJB100L4，SKAF127RF87-YEJB112M4，SKAF127RF87-YEJB132M4，SKAF127RF87-YEJB160M4，SKAF127RF87-YP100L4，SKAF127RF87-YP112M4，SKAF127RF87-YP132M4，SKAF127RF87-YP160M4，SKAF127RF87-YPB100L4，SKAF127RF87-YPB112M4，SKAF127RF87-YPB132M4，SKAF127RF87-YPB160M4，SKAF127RF87-YPE100L4，SKAF127RF87-YPE112M4，SKAF127RF87-YPE132M4，SKAF127RF87-YPE160M4，SKAF127RF87-YS100L4，SKAF127RF87-YS112M4，SKAF127RF87-YS132M4，SKAF127RF87-YS160M4，SKAF127RF87-YVB100L4，SKAF127RF87-YVB112M4，SKAF127RF87-YVB132M4，SKAF127RF87-YVB160M4，SKAF127RF87-YVP100L4，SKAF127RF87-YVP112M4，SKAF127RF87-YVP132M4，SKAF127RF87-YVP160M4，SKAF127RF87-YVPEJ100L4，SKAF127RF87-YVPEJ112M4，SKAF127RF87-YVPEJ132M4，SKAF127RF87-YVPEJ160M4，XDKAF127R87-Y100M4，XDKAF127R87-Y112M4，XDKAF127R87-Y132M4，XDKAF127R87-Y160M4，XDKAF127RF87-Y100M4，XDKAF127RF87-Y112M4，XDKAF127RF87-Y11KWAF，XDKAF127RF87-Y132M4，XDKAF127RF87-Y15KWAF，XDKAF127RF87-Y160M4，XDKAF127RF87-Y2.2KWAF，XDKAF127RF87-Y3KWAF，XDKAF127RF87-Y4KWAF，XDKAF127RF87-Y5.5KWAF，XDKAF127RF87-Y7.5KWAF，XDKAF127RF87-YB100L4，XDKAF127RF87-YB112M4，XDKAF127RF87-YB132M4，XDKAF127RF87-YB160M4，XDKAF127RF87-YDP100L4，XDKAF127RF87-YDP112M4，XDKAF127RF87-YDP132M4，XDKAF127RF87-YDP160M4，XDKAF127RF87-YE100L4，XDKAF127RF87-YE112M4，XDKAF127RF87-YE132M4，XDKAF127RF87-YE160M4，XDKAF127RF87-YEJ100L4，XDKAF127RF87-YEJ112M4，XDKAF127RF87-YEJ132M4，XDKAF127RF87-YEJ160M4，XDKAF127RF87-YEJB100L4，XDKAF127RF87-YEJB112M4，XDKAF127RF87-YEJB132M4，XDKAF127RF87-YEJB160M4，XDKAF127RF87-YP100L4，XDKAF127RF87-YP112M4，XDKAF127RF87-YP132M4，XDKAF127RF87-YP160M4，XDKAF127RF87-YPB100L4，XDKAF127RF87-YPB112M4，XDKAF127RF87-YPB132M4，XDKAF127RF87-YPB160M4，XDKAF127RF87-YPE100L4，XDKAF127RF87-YPE112M4，XDKAF127RF87-YPE132M4，XDKAF127RF87-YPE160M4，XDKAF127RF87-YS100L4，XDKAF127RF87-YS112M4，XDKAF127RF87-YS132M4，XDKAF127RF87-YS160M4，XDKAF127RF87-YVB100L4，XDKAF127RF87-YVB112M4，XDKAF127RF87-YVB132M4，XDKAF127RF87-YVB160M4，XDKAF127RF87-YVP100L4，XDKAF127RF87-YVP112M4，XDKAF127RF87-YVP132M4，XDKAF127RF87-YVP160M4，XDKAF127RF87-YVPEJ100L4，XDKAF127RF87-YVPEJ112M4，XDKAF127RF87-YVPEJ132M4，XDKAF127RF87-YVPEJ160M4，WKAF127R87-Y100M4，WKAF127R87-Y112M4，WKAF127R87-Y132M4，WKAF127R87-Y160M4，WKAF127RF87-Y100M4，WKAF127RF87-Y112M4，WKAF127RF87-Y11KWAF，WKAF127RF87-Y132M4，WKAF127RF87-Y15KWAF，WKAF127RF87-Y160M4，WKAF127RF87-Y2.2KWAF，WKAF127RF87-Y3KWAF，WKAF127RF87-Y4KWAF，WKAF127RF87-Y5.5KWAF，WKAF127RF87-Y7.5KWAF，WKAF127RF87-YB100L4，WKAF127RF87-YB112M4，WKAF127RF87-YB132M4，WKAF127RF87-YB160M4，WKAF127RF87-YDP100L4，WKAF127RF87-YDP112M4，WKAF127RF87-YDP132M4，WKAF127RF87-YDP160M4，WKAF127RF87-YE100L4，WKAF127RF87-YE112M4，WKAF127RF87-YE132M4，WKAF127RF87-YE160M4，WKAF127RF87-YEJ100L4，WKAF127RF87-YEJ112M4，WKAF127RF87-YEJ132M4，WKAF127RF87-YEJ160M4，WKAF127RF87-YEJB100L4，WKAF127RF87-YEJB112M4，WKAF127RF87-YEJB132M4，WKAF127RF87-YEJB160M4，WKAF127RF87-YP100L4，WKAF127RF87-YP112M4，WKAF127RF87-YP132M4，WKAF127RF87-YP160M4，WKAF127RF87-YPB100L4，WKAF127RF87-YPB112M4，WKAF127RF87-YPB132M4，WKAF127RF87-YPB160M4，WKAF127RF87-YPE100L4，WKAF127RF87-YPE112M4，WKAF127RF87-YPE132M4，WKAF127RF87-YPE160M4，WKAF127RF87-YS100L4，WKAF127RF87-YS112M4，WKAF127RF87-YS132M4，WKAF127RF87-YS160M4，WKAF127RF87-YVB100L4，WKAF127RF87-YVB112M4，WKAF127RF87-YVB132M4，WKAF127RF87-YVB160M4，WKAF127RF87-YVP100L4，WKAF127RF87-YVP112M4，WKAF127RF87-YVP132M4，WKAF127RF87-YVP160M4，WKAF127RF87-YVPEJ100L4，WKAF127RF87-YVPEJ112M4，WKAF127RF87-YVPEJ132M4，WKAF127RF87-YVPEJ160M4，JCKAF127R87-Y100M4，JCKAF127R87-Y112M4，JCKAF127R87-Y132M4，JCKAF127R87-Y160M4，JCKAF127RF87-Y100M4，JCKAF127RF87-Y112M4，JCKAF127RF87-Y11KWAF，JCKAF127RF87-Y132M4，JCKAF127RF87-Y15KWAF，JCKAF127RF87-Y160M4，JCKAF127RF87-Y2.2KWAF，JCKAF127RF87-Y3KWAF，JCKAF127RF87-Y4KWAF，JCKAF127RF87-Y5.5KWAF，JCKAF127RF87-Y7.5KWAF，JCKAF127RF87-YB100L4，JCKAF127RF87-YB112M4，JCKAF127RF87-YB132M4，JCKAF127RF87-YB160M4，JCKAF127RF87-YDP100L4，JCKAF127RF87-YDP112M4，JCKAF127RF87-YDP132M4，JCKAF127RF87-YDP160M4，JCKAF127RF87-YE100L4，JCKAF127RF87-YE112M4，JCKAF127RF87-YE132M4，JCKAF127RF87-YE160M4，JCKAF127RF87-YEJ100L4，JCKAF127RF87-YEJ112M4，JCKAF127RF87-YEJ132M4，JCKAF127RF87-YEJ160M4，JCKAF127RF87-YEJB100L4，JCKAF127RF87-YEJB112M4，JCKAF127RF87-YEJB132M4，JCKAF127RF87-YEJB160M4，JCKAF127RF87-YP100L4，JCKAF127RF87-YP112M4，JCKAF127RF87-YP132M4，JCKAF127RF87-YP160M4，JCKAF127RF87-YPB100L4，JCKAF127RF87-YPB112M4，JCKAF127RF87-YPB132M4，JCKAF127RF87-YPB160M4，JCKAF127RF87-YPE100L4，JCKAF127RF87-YPE112M4，JCKAF127RF87-YPE132M4，JCKAF127RF87-YPE160M4，JCKAF127RF87-YS100L4，JCKAF127RF87-YS112M4，JCKAF127RF87-YS132M4，JCKAF127RF87-YS160M4，JCKAF127RF87-YVB100L4，JCKAF127RF87-YVB112M4，JCKAF127RF87-YVB132M4，JCKAF127RF87-YVB160M4，JCKAF127RF87-YVP100L4，JCKAF127RF87-YVP112M4，JCKAF127RF87-YVP132M4，JCKAF127RF87-YVP160M4，JCKAF127RF87-YVPEJ100L4，JCKAF127RF87-YVPEJ112M4，JCKAF127RF87-YVPEJ132M4，JCKAF127RF87-YVPEJ160M4，NKAF127R87-Y100M4，NKAF127R87-Y112M4，NKAF127R87-Y132M4，NKAF127R87-Y160M4，NKAF127RF87-Y100M4，NKAF127RF87-Y112M4，NKAF127RF87-Y11KWAF，NKAF127RF87-Y132M4，NKAF127RF87-Y15KWAF，NKAF127RF87-Y160M4，NKAF127RF87-Y2.2KWAF，NKAF127RF87-Y3KWAF，NKAF127RF87-Y4KWAF，NKAF127RF87-Y5.5KWAF，NKAF127RF87-Y7.5KWAF，NKAF127RF87-YB100L4，NKAF127RF87-YB112M4，NKAF127RF87-YB132M4，NKAF127RF87-YB160M4，NKAF127RF87-YDP100L4，NKAF127RF87-YDP112M4，NKAF127RF87-YDP132M4，NKAF127RF87-YDP160M4，NKAF127RF87-YE100L4，NKAF127RF87-YE112M4，NKAF127RF87-YE132M4，NKAF127RF87-YE160M4，NKAF127RF87-YEJ100L4，NKAF127RF87-YEJ112M4，NKAF127RF87-YEJ132M4，NKAF127RF87-YEJ160M4，NKAF127RF87-YEJB100L4，NKAF127RF87-YEJB112M4，NKAF127RF87-YEJB132M4，NKAF127RF87-YEJB160M4，NKAF127RF87-YP100L4，NKAF127RF87-YP112M4，NKAF127RF87-YP132M4，NKAF127RF87-YP160M4，NKAF127RF87-YPB100L4，NKAF127RF87-YPB112M4，NKAF127RF87-YPB132M4，NKAF127RF87-YPB160M4，NKAF127RF87-YPE100L4，NKAF127RF87-YPE112M4，NKAF127RF87-YPE132M4，NKAF127RF87-YPE160M4，NKAF127RF87-YS100L4，NKAF127RF87-YS112M4，NKAF127RF87-YS132M4，NKAF127RF87-YS160M4，NKAF127RF87-YVB100L4，NKAF127RF87-YVB112M4，NKAF127RF87-YVB132M4，NKAF127RF87-YVB160M4，NKAF127RF87-YVP100L4，NKAF127RF87-YVP112M4，NKAF127RF87-YVP132M4，NKAF127RF87-YVP160M4，NKAF127RF87-YVPEJ100L4，NKAF127RF87-YVPEJ112M4，NKAF127RF87-YVPEJ132M4，NKAF127RF87-YVPEJ160M4，KWAF127RW87-Y100M4，KWAF127RW87-Y112M4，KWAF127RW87-Y132M4，KWAF127RW87-Y160M4，KWAF127RWF87-Y100M4，KWAF127RWF87-Y112M4，KWAF127RWF87-Y11KWAF，KWAF127RWF87-Y132M4，KWAF127RWF87-Y15KWAF，KWAF127RWF87-Y160M4，KWAF127RWF87-Y2.2KWAF，KWAF127RWF87-Y3KWAF，KWAF127RWF87-Y4KWAF，KWAF127RWF87-Y5.5KWAF，KWAF127RWF87-Y7.5KWAF，KWAF127RWF87-YB100L4，KWAF127RWF87-YB112M4，KWAF127RWF87-YB132M4，KWAF127RWF87-YB160M4，KWAF127RWF87-YDP100L4，KWAF127RWF87-YDP112M4，KWAF127RWF87-YDP132M4，KWAF127RWF87-YDP160M4，KWAF127RWF87-YE100L4，KWAF127RWF87-YE112M4，KWAF127RWF87-YE132M4，KWAF127RWF87-YE160M4，KWAF127RWF87-YEJ100L4，KWAF127RWF87-YEJ112M4，KWAF127RWF87-YEJ132M4，KWAF127RWF87-YEJ160M4，KWAF127RWF87-YEJB100L4，KWAF127RWF87-YEJB112M4，KWAF127RWF87-YEJB132M4，KWAF127RWF87-YEJB160M4，KWAF127RWF87-YP100L4，KWAF127RWF87-YP112M4，KWAF127RWF87-YP132M4，KWAF127RWF87-YP160M4，KWAF127RWF87-YPB100L4，KWAF127RWF87-YPB112M4，KWAF127RWF87-YPB132M4，KWAF127RWF87-YPB160M4，KWAF127RWF87-YPE100L4，KWAF127RWF87-YPE112M4，KWAF127RWF87-YPE132M4，KWAF127RWF87-YPE160M4，KWAF127RWF87-YS100L4，KWAF127RWF87-YS112M4，KWAF127RWF87-YS132M4，KWAF127RWF87-YS160M4，KWAF127RWF87-YVB100L4，KWAF127RWF87-YVB112M4，KWAF127RWF87-YVB132M4，KWAF127RWF87-YVB160M4，KWAF127RWF87-YVP100L4，KWAF127RWF87-YVP112M4，KWAF127RWF87-YVP132M4，KWAF127RWF87-YVP160M4，KWAF127RWF87-YVPEJ100L4，KWAF127RWF87-YVPEJ112M4，KWAF127RWF87-YVPEJ132M4，KWAF127RWF87-YVPEJ160M4，KAF129R89-Y100M4，KAF129R89-Y112M4，KAF129R89-Y132M4，KAF129R89-Y160M4，KAF129RF89-Y100M4，KAF129RF89-Y112M4，KAF129RF89-Y11KWAF，KAF129RF89-Y132M4，KAF129RF89-Y15KWAF，KAF129RF89-Y160M4，KAF129RF89-Y2.2KWAF，KAF129RF89-Y3KWAF，KAF129RF89-Y4KWAF，KAF129RF89-Y5.5KWAF，KAF129RF89-Y7.5KWAF，KAF129RF89-YB100L4，KAF129RF89-YB112M4，KAF129RF89-YB132M4，KAF129RF89-YB160M4，KAF129RF89-YDP100L4，KAF129RF89-YDP112M4，KAF129RF89-YDP132M4，KAF129RF89-YDP160M4，KAF129RF89-YE100L4，KAF129RF89-YE112M4，KAF129RF89-YE132M4，KAF129RF89-YE160M4，KAF129RF89-YEJ100L4，KAF129RF89-YEJ112M4，KAF129RF89-YEJ132M4，KAF129RF89-YEJ160M4，KAF129RF89-YEJB100L4，KAF129RF89-YEJB112M4，KAF129RF89-YEJB132M4，KAF129RF89-YEJB160M4，KAF129RF89-YP100L4，KAF129RF89-YP112M4，KAF129RF89-YP132M4，KAF129RF89-YP160M4，KAF129RF89-YPB100L4，KAF129RF89-YPB112M4，KAF129RF89-YPB132M4，KAF129RF89-YPB160M4，KAF129RF89-YPE100L4，KAF129RF89-YPE112M4，KAF129RF89-YPE132M4，KAF129RF89-YPE160M4，KAF129RF89-YS100L4，KAF129RF89-YS112M4，KAF129RF89-YS132M4，KAF129RF89-YS160M4，KAF129RF89-YVB100L4，KAF129RF89-YVB112M4，KAF129RF89-YVB132M4，KAF129RF89-YVB160M4，KAF129RF89-YVP100L4，KAF129RF89-YVP112M4，KAF129RF89-YVP132M4，KAF129RF89-YVP160M4，KAF129RF89-YVPEJ100L4，KAF129RF89-YVPEJ112M4，KAF129RF89-YVPEJ132M4，KAF129RF89-YVPEJ160M4。

KAF129R89減速電機生產(chǎn)廠家展示：看廠請聯(lián)系微信13827261050，獲取位置，需提前一天預約http://www.hnwshg.com/product/list-kafxiliejiansuji-cn.html

推薦型號：K129減速機