瑞昌明盛進出口貿(mào)易有限公司
主營DCS控制系統(tǒng)備件,PLC系統(tǒng)備件及機器人系統(tǒng)備件,
優(yōu)勢品牌:Allen Bradley、BentlyNevada、ABB、Emerson Ovation、Honeywell DCS、Rockwell ICS Triplex、FOXBORO、Schneider PLC、GE Fanuc、Motorola、HIMA、TRICONEX、Prosoft等各種進口工業(yè)零部件我們使用電位器A(左邊的電位器)來調(diào)整參數(shù)。當旋轉(zhuǎn)左邊的電位器時,SMB28的值會從0—255變化,而要求調(diào)整的定時值是2—6秒,當采用分辨率為100毫秒的定時器時,即要求調(diào)整的值是20—60。 因此我們做一個計算,設(shè)x為SMB28的值,y為我們需要的定時值利用臺達可編程控制器(PLC)與交流伺服控制器針對FD1500型制袋封切機控制系統(tǒng)項目開發(fā)技術(shù)。項目人機界面選用臺達觸摸屏(HMI)提供友好的人機交流接口與合理的控制流程,以實現(xiàn)高效率、高精度的袋料剪切。本文分別就制袋機的工作原理,電氣設(shè)計,HMI、PLC選型及程序設(shè)計等幾方面進行闡述,該電氣系統(tǒng)的成功開發(fā)可以為使用臺達HMI、PLC與交流伺服電機相結(jié)合的機電一體化控制系統(tǒng)項目開發(fā)起到借鑒示教作用。 1 引言 項目原型基于小型制袋封切機開發(fā)外銷出口型新機。原制袋寬度為600-1000mm。由于該機型送料膠輥慣量較小,送料電機采用130步進電機經(jīng)過減速可實現(xiàn)傳動,使用單片機進行位置控制。新機型制袋寬度提高到1500mm,送料膠輥慣量大幅增加,考慮到既能滿足精度和速度的要求又有較大的瞬間轉(zhuǎn)矩,送料系統(tǒng)改用伺服電機。由于用PLC開發(fā)周期較短而且抗干擾性、靈活性好,所以采用PLC HMI作為控制系統(tǒng)。同時可實現(xiàn)中英文操作畫面,滿足設(shè)備出口的要求。 2 封切機機工藝 2.1 工藝結(jié)構(gòu) 封切機機由機身、上下切刀、變頻傳動機構(gòu)、上下送料膠輥、伺服傳動機構(gòu)、放料架、放料直流電機、可調(diào)色標檢測架、可移動操作箱、電控箱等單元構(gòu)成,參見圖1圖片。
2.2 封切機工藝過程 (1)空白定位運行方式:忽略色標信號,送料長度為設(shè)置袋長,送料完成后剪切并計袋數(shù),循環(huán)動作直至袋數(shù)達到設(shè)定值,停機并延時至設(shè)置時間,以等待收料設(shè)備或操作人員收集袋料后,再次啟動并循環(huán)工作。 (2)色標定位運行方式:送料長度為設(shè)置袋長,在此期間的色標信號忽略,繼續(xù)送出偏差長度的袋料,檢測色標信號,定位于色標信號,定位完成后剪切并計袋數(shù),循環(huán)動作直至袋數(shù)達到設(shè)定值,停機并延時至設(shè)置時間,等待收料設(shè)備或操作人員收集袋料后,再次啟動并循環(huán)工作。若誤檢次數(shù)達到默認值,則停機并報警。 工作流程如圖2所示。
3 FD1500型封切機機電系統(tǒng)設(shè)計 3.1 傳動系統(tǒng)設(shè)計 (1)切刀傳動系統(tǒng)。切刀傳動系統(tǒng)為交流變頻器拖動三相異步電機,由面板電位器調(diào)速,PLC控制切刀啟動與停止。傳動軸上安裝2只霍爾開關(guān),分別檢測切刀低位和送料/切刀高位。開關(guān)1:切刀低位信號,該信號為送料停止信號。若送料時檢測到切刀低位信號則表示系統(tǒng)超速,需報警并停機。開關(guān)2:收到切刀低位信號后的ON信號為送料信號,是送料電機的啟動信號;第二次ON信號為切刀高位信號,是高位停機時的停機信號。 (2)送料傳動系統(tǒng)。送料傳動部分為交流伺服系統(tǒng),采用同步帶1:2減速傳動。動力選用臺達中慣量2KW伺服電機。具體型號:驅(qū)動器ASD-A2023M,電機ASMT20M250。 (3)控制精度計算。通過以下計算得出單個脈沖對應的送料長度,即為控制精度。
系統(tǒng)要求0.2mm定位精度,現(xiàn)計算得出控制精度為0.0314mm,因機械定位誤差不大于0.1mm,所以:定位精度 機械誤差=0.1314mm<0.2mm,定位精度滿足制袋機系統(tǒng)要求。 (4)高脈沖輸出頻率計算。用戶要求高送料速度為180m/min,由此可計算得出系統(tǒng)所要求的脈沖輸出頻率,以此為PLC選型的重要依據(jù)
3.2 PLC與HMI選型 (1)輸入信號統(tǒng)計。在色標傳感器檢標時,由于袋料上所印刷的色標不同,故亮通(Light On)、暗通(Dark On)均有可能。無論亮通或是暗通,在檢測到色標信號時都需要PLC作出中斷響應,所以需要把色標傳感器的Light On與Dark On都接入PLC。色標信號:2點;低位信號:1點;高位/送料信號:1點,共4點DI信號。 (2)輸出信號統(tǒng)計。脈沖輸出(Pulse Sign):2點(Y0,Y1);切刀動作:1點;沖孔動作:1點;蜂鳴器:1點;共5點DO信號。 system is formed by many exchanges and on-site investigation with customers!
So far, although the fabric is not very ideal, I think it has been successful in terms of electrical configuration! So I will share the project case with you!
System composition
The electrical system is mainly divided into two parts: the main control part and the three-axis electric control part. The main control part is made by the machinery manufacturer. It mainly realizes the control of the main shaft, including inching, start-up, warp stop, weft stop and other functions! It is completed by MCU + LCD! The other part is the three warp axis control part, which is the most important part, because its quality directly affects whether the fabric is qualified and whether the modification project is successful!
The three warp axis part is mainly composed of Delta a 7.5 man-machine interface, eh 20 point programmable controller (transistor output), three 0.75KW A-type AC servo drivers and a 360 line incremental encoder! The programmable controller is used as the CPU; Set the interface with the man-machine interface as the parameter; Modbus protocol is used to control the communication of large coil; High speed pulse control is adopted for the two-day meridian! The specific system composition is as follows:
Hardware system:
A. Three axis electrical configuration:
B. Definition of programmable controller di / do port:
C. System architecture:
explain:
(1) Three servos control 1, 2-day warp and large winding equipment respectively
(2) 1. 2 servo adopts Pt mode pulse control; Delta MODBUS is adopted for large coil loading servo
RTU
Communication control(
PLC
Master and slaver for large roll loading servo!
(3) The encoder is installed on the spindle to test the angle!
(4) Dvp20eh00t programmable controller has two 200kHz pulse output terminals
Software system:
Software programming is compiled in combination with