1734-RTBS 1734-RTBS 1734-RTBS 1734-RTBS 1734-RTBS 1734-RTBS 1734-RTBS 1734-RTBS
1734-RTBS 1734-RTBS 1734-RTBS 1734-RTBS 1734-RTBS 1734-RTBS 1734-RTBS 1734-RTBS
1734-RTBS 1734-RTBS 1734-RTBS 1734-RTBS 1734-RTBS 1734-RTBS 1734-RTBS 1734-RTBS
1734-RTBS 1734-RTBS 1734-RTBS 1734-RTBS 1734-RTBS 1734-RTBS 1734-RTBS 1734-RTBS
通常機(jī)床主軸電動(dòng)機(jī)制動(dòng)時(shí),采用的是能耗制動(dòng)方式,使電動(dòng)機(jī)AB相輸入直流電源。
采用能耗制動(dòng)方式使主軸電動(dòng)機(jī)停止,主軸在低檔位低速旋轉(zhuǎn)時(shí),大約需要0.5s,在高檔位高速旋轉(zhuǎn)時(shí),大約需要2.5s。目前,采用的主軸電動(dòng)機(jī)制動(dòng)方法如圖1所示,先斷開KM1,再閉合開關(guān)KM2,從而斷開三相交流電源,接通直流電源,延時(shí)2.5s,認(rèn)定主軸電動(dòng)機(jī)停止旋轉(zhuǎn),然后進(jìn)行換刀或其它動(dòng)作。
主軸以不同的速度旋轉(zhuǎn)時(shí),采用能耗制動(dòng)方式使主軸停止所需要的時(shí)間不同,采用同樣的能耗制動(dòng)時(shí)間,延長(zhǎng)無意義的加工輔助時(shí)間,降低了機(jī)床工作效率。另外,一旦開關(guān)KM2不能可靠閉合,或者直流電源保險(xiǎn)斷開不能正常提供直流電,則主軸電動(dòng)機(jī)只能在摩擦力的作用下減速,制動(dòng)時(shí)間需要很長(zhǎng),但延時(shí)2.5s后,機(jī)床數(shù)控系統(tǒng)仍然認(rèn)定主軸電動(dòng)機(jī)已經(jīng)停止旋轉(zhuǎn),此時(shí)機(jī)床進(jìn)行換刀或其它動(dòng)作容易造成事故。
因此,我們對(duì)機(jī)床主軸制動(dòng)控制方式進(jìn)行了改進(jìn)設(shè)計(jì),判斷主軸旋轉(zhuǎn)狀態(tài),不采用延時(shí)2.5s,即認(rèn)定主軸電動(dòng)機(jī)停止旋轉(zhuǎn)的控制方式,而是實(shí)時(shí)監(jiān)控主軸旋轉(zhuǎn)狀態(tài),當(dāng)主軸旋轉(zhuǎn)低于一定轉(zhuǎn)速時(shí),立即發(fā)出主軸停止完了信號(hào)。
2 主軸轉(zhuǎn)速監(jiān)測(cè)方案
在電動(dòng)機(jī)的同步傳動(dòng)軸上安裝一塊條形鐵片,和電動(dòng)機(jī)同步旋轉(zhuǎn),由接近開關(guān)對(duì)其檢測(cè),每轉(zhuǎn)檢測(cè)到兩個(gè)脈沖信號(hào),通過對(duì)脈沖信號(hào)的檢測(cè)而得知其轉(zhuǎn)速。檢測(cè)脈沖信號(hào)有兩種方案。
第一方案:在一定周期Tp內(nèi)讀取脈沖信號(hào)的個(gè)數(shù)N,PLC是一種順序控制器,它的程序是由前到后一步一步執(zhí)行,每執(zhí)行完一遍為一個(gè)掃描周期,然后從頭開始循環(huán)執(zhí)行。假如程序有2000步,每步執(zhí)行時(shí)間周期為30μs,則程序的掃描周期約60ms,掃描頻率約16Hz,能夠準(zhǔn)確檢測(cè)出的脈沖頻率應(yīng)低于8Hz,當(dāng)轉(zhuǎn)速的脈沖頻率大于16Hz,即轉(zhuǎn)速n≥480r/min時(shí),PLC受其掃描頻率的影響,不能準(zhǔn)確檢測(cè)出脈沖的個(gè)數(shù),情況不好時(shí),會(huì)出現(xiàn)高速時(shí)檢測(cè)的脈沖個(gè)數(shù)很少,誤判為電動(dòng)機(jī)基本停止而進(jìn)行下面動(dòng)作,造成事故。此種方案只適用于主軸低速旋轉(zhuǎn)狀態(tài)的監(jiān)測(cè)。
第二種方案:檢測(cè)脈沖信號(hào)持續(xù)為“0”或“1”的時(shí)間T,當(dāng)n<60r/min時(shí),發(fā)出主軸停止完了信號(hào)。由于PLC程序執(zhí)行過程的延時(shí),數(shù)控系統(tǒng)收到主軸停止信號(hào),并執(zhí)行下面動(dòng)作時(shí),主軸已完全停止旋轉(zhuǎn),n=60r/min所對(duì)應(yīng)脈沖信號(hào)持續(xù)為“0”或“1”的時(shí)間T為0.25s,因此我們把檢測(cè)脈沖信號(hào)的計(jì)時(shí)器設(shè)定為0.25s。同樣高速時(shí)也會(huì)出現(xiàn)脈沖測(cè)不準(zhǔn)的情況,但不管情況多壞,在0.25s的時(shí)間內(nèi)“0”或“1”至少變化一次,因此可以準(zhǔn)確地判斷主軸是否停止旋轉(zhuǎn)。此方案可以適用于主軸高速或低速旋轉(zhuǎn)時(shí)主軸制動(dòng)狀態(tài)的檢測(cè)。在實(shí)際應(yīng)用中,我們采用了此方案。
3 PLC實(shí)現(xiàn)主軸能耗制動(dòng)的控制方法
PLC設(shè)計(jì)程序中,X20.0為轉(zhuǎn)速脈沖信號(hào)的輸入,M05為主軸停止信號(hào),Y50.0為主軸停止完了信號(hào)。
兩個(gè)計(jì)時(shí)器TM1、TM2分別判斷X20.0脈沖信號(hào)持續(xù)為“0”或“1”的時(shí)間是否達(dá)到設(shè)定的時(shí)間,只要有一個(gè)時(shí)間到達(dá),即R100.1或R100.2變“1”,導(dǎo)致R100.3變“1”,此時(shí)M05為“1”,導(dǎo)致Y50.0輸出“1”,則發(fā)出主軸制動(dòng)完了信號(hào),實(shí)現(xiàn)了主軸停止的準(zhǔn)確判斷。
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CONTROL TECHNIQUES 960020-01 USPP 96002001
CONTROL TECHNIQUES 960146-01 USPP 96014601
CONTROL TECHNIQUES 960186-01 USPP 96018601
CONTROL TECHNIQUES 960503-01 NSFP 96050301
CONTROL TECHNIQUES SE33400550 NSPP SE33400550
CONTROL TECHNIQUES EI-203-00-000 NSPP EI20300000
CONTROL TECHNIQUES EI-DN-203-00-000 NSPP EIDN20300000
CONTROL TECHNIQUES EB-202-00-C01 USPP EB20200C01
CONTROL TECHNIQUES 075U2B401BACAA075140 NSPP 075U2B401BACAA01
CONTROL TECHNIQUES 960154-01 USPP 96015401
CONTROL TECHNIQUES UD52 NSPP UD52
CONTROL TECHNIQUES 2450-2008 USPP 24502008
CONTROL TECHNIQUES 2450-4013 USPP 24504013
CONTROL TECHNIQUES 2450-4109 USPP 24504109
CONTROL TECHNIQUES 820033-01 USPP 82003301
CONTROL TECHNIQUES 960117-01 USPP 96011701
CONTROL TECHNIQUES 02-766390-01 USPP 0276639001
CONTROL TECHNIQUES 2450-4005 USPP 24504005
CONTROL TECHNIQUES 960162-01 USPP 96016201
CONTROL TECHNIQUES 960187-01 USPP 96018701
CONTROL TECHNIQUES DXM6300W *NNB*
Control Techniques 2400-8001 Drive Board 10A 90/180VDC ! WOW !
Control Techniques servo motor 115MSB070201AG, With brake, From Arrow 750
CONTROL TECHNIQUES SERVO 190UMB300CACAA MOTOR
Control Techniques 6M15 Relcon DC Drive 440V ! RFB !
Control Techniques MHM-6300
CONTROL TECHNIQUES NTE-354-CONS-0000 + 2RBM160DMK-SL !
Control Techniques ALP-130 Power Supply 240V ! WOW !
Control Techniques I/O module C80030 removed from a Cincinnati Arrow 750
CONTROL TECHNIQUES 115U2D400VBCAA1152 UNIMOTOR
Control Techniques UNIDRIVE RFI Line Filter 50Amp
Emerson / Control Techniques XCMDBEF-010 Cable
CONTROL TECHNIQUES DRIVE F3N5E
Body Control (Using Techniques Developed by Joseph H. Pilates)
Control Techniques SP1201 Unidrive SP
CONTROL TECHNIQUES EMERSON DIGITAL ST DST1045 3098-0018
Control Techniques SIBAH003 Cable
Control Techniques DutymAx MS ServoMotor 115MSA040290AG
Control Techniques servo motor 115MSB070201AG, With brake, From Arrow 750
Control Techniques Flux Vector Drive VB 110 NP
Control Techniques Dynamic Braking Unit
Control Techniques Dynamic Braking Unit
CONTROL TECHNIQUES COMMANDER SE 23400220 SE 3.5T 2.2KW
CONTROL TECHNIQUES CT UNI-2402 UNI2402 Free Ship
Control Techniques I/O module C80030 removed from a Cincinnati Arrow 750
CONTROL TECHNIQUES FOR PARTICULATE AIR POLLUTANTS
CONTROL TECHNIQUES DRIVE MD-434-00-000
Comptrol Linear Positioner Assembly Control Techniques
CONTROL TECHNIQUES DXM-340C SERVO MOTOR
SE33200750 10.0hp Commander SE Drive Control Techniques SE 11 TL
UniDrive VTC UNI-2403-VTC CONTROL TECHNIQUES UNI2043VTC 11KW Software 03.01.05
NEW! Emerson Control Techniques UNIDRIVE SP SP2402
UniDrive VTC UNI4401VTC Control Techniques 45Kw Uni-4401-VTC
Control Techniques NTE-207-TONS-0000 Servo Motor
Avon Advance Techniques frizz control lotus shield
Control Techniques Cheetah SM Driver
Control Techniques Dinverter listed 768R (2)
New Control Techniques SE23200400 Commander SE 5.5TL S/W 02.00.1 * NIB *
AVON ADVANCE TECHNIQUES Frizz Control Lotus Shield Anti-Frizz Treatment
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Avon Advance Techniques Hair Care Range -Choice- SAVE! Buy Lots! see listing
AVON ADVANCE TECHNIQUES FRIZZ CONTROL SHAMPOO
AVON ADVANCE TECHNIQUES FRIZZ CONTROL,60ML NEW, LEAVE I
Avon - Advance Techniques - 1st Class Postage
Avon Advanced Techniques Frizz Control Anti Frizz Serum 30ml NEW
Advance Techniques lotus shield frizz control serum
Control Techniques Commander SKB3400037 Drive
NEW Avon Advance Techniques Frizz Control Extra Strength Anti-Frizz Serum RARE
1A1 Ultimate Techniques for Time Management: You Can Take Control Of Your Time!
Location: Canada