PLC controls a system to build an equipment to transform medium application in plastic extruding

Time:2023-06-20 10:21:21
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source:KOMANG CNC Machining

1 foreword is in polyethylene is plastic in manufacturing technology, extruding makes an equipment is the mechanical equipment with a kind of more sophisticated technology, its control a system is the hinge that safeguard equipment moves normally and produces character amount. The system of control of DCS of form a complete set that uses an entrance is mostly in the equipment of each product line before, it is more difficult to its are safeguarded and be improved, and cost is very high. We build homebred extruding to make an equipment in the near future in, used PLC to control a system, its performance is steady and cost is low. The production before transform moves in, what because take the instability of makings and product name,change is regular, the level that makes so that the hand moves an operation to make the product is achieved very hard not only idealer, and often appear because pressure is exorbitant,block film of makings, explosion proof up attaint and other mechanical failure, produce go into operation thereby rate is not high, short of equipment is nominal crop. After using PLC to control a system, improved the reliability that equipment runs and successive stability greatly, make product quality reachs higher level. Characteristic of 2 equipment technology and control ask 2.

Characteristic of 1 equipment technology pursues 1 for diagram of technological process of plastic product line, its basically include to mix pump of frit of refine machine, feeding machine, be in harmony and pelleter 4 much. Function of the machine that mix refine is composition of will different raw material undertakes mixture, and plasticate becomes fluid of a kind of stiff shape -- fuse-element is plastic; The fuse-element that feeding machine uses at inducting to be poured out of from the machine that mix refine is plastic, convey its equably to undertake rising extrusion quickly to entrance of pump of frit of be in harmony. Course plasticate is treated fuse-element is plastic, be squeezed to cross pattern plate to become a filiform below high pressure; In pelleter by even ground cut, fashion grain product of the standard finally, adopt working procedure of the system after cool and be being carried of grain water. The automata flow of extruder shows 2 times like the graph: In the graph: FT-2425 enters makings discharge to mix refine machine, span is 0 ～ 15T/h; PT-2426 is feeding machine outlet pressure, span is 0 ～ 10MPa; PT-2427 is melt pump outlet pressure, span is 0 ～ 50MPa; 2.

2 control ask 2.

Control of 1 main loop asks according to equipment technology, extruder basically needs 3 operating ring red-letter days: Loop of loop of feeding machine control, control of pump of frit of be in harmony and pelleter dominate return circuit. In addition still temperature of oil tank of melt pump lube controls loop and outlet temperature of melt pump lube to control loop to wait. ① feeding machine dominates return circuit -- one electron level is set in the entrance of the machine that mix refine, can detect makings trends discharge, its change uses at controlling feed machine have makings rate. Pump of frit of ② be in harmony dominates return circuit -- this loop uses the control that cluster form, namely the working rate of pump of frit of be in harmony is controlled by the outlet pressure of the rotate speed of feeding machine and feeding machine jointly. Among them the rotate speed of feeding machine regards auxiliary control as parameter, the PID output of feeding machine outlet pressure regards main control as parameter, pass the adjustment of revolution speed of pair of frit of be in harmony namely, stability of outlet pressure of control feeding machine is in 5mp. ③ pelleter dominates return circuit -- this loop also uses the control that cluster form, namely the working rate of pelleter is controlled by the outlet pressure of the rotate speed of pump of frit of be in harmony and pump of frit of be in harmony jointly. Among them the rotate speed of pump of frit of be in harmony regards auxiliary control as parameter, the PID output of outlet pressure regards pump of frit of be in harmony as main control parameter, the control that passes pair of pelleter rotate speed namely adjusts, in order to make sure product particle size is even, exterior qualification. 2.

2 interlocking control still need in device control character a few call the police interlocking control, basically call the police interlocking control has: Pressure of lube of ① feeding machine calls the police pressure of lube of pump of interlocking ② melt calls the police pump of interlocking ③ feeding machine, melt and temperature of bearing of pelleter electric machinery call the police before net of pump of interlocking ④ melt, after blow up interlocking ⑤ pelleter cuts velar position.

3 hands / when because equipment is being started,automatic switch is controlled, moving condition and working parameter are more complex, general need operates personnel to undertake the hand uses control, after equipment system runs stabler period of time, ability switch arrives automation system. The control that dominates return circuit of loop of loop, control of pump of frit of be in harmony and pelleter control in feeding machine so must come true without disturb smooth switch. If the graph is shown 2 times,3 systems make this automation system, its are used on, the architecture that leaves an opportunity. Controlling indoor accuse the computer to operate a station as man-machine interface by 2 labour, falling the SYSMACCS1 system that PLC uses OMRON firm; CS1 system is to have high speed, efficient, Gao Ke to lean, compact model the PLC system of CPU, its CPU chooses CS1-CPU65H model. Controllerlink network is used between the computer and PLC, this net is used twinning communication cable, its are the biggest communication rate is 2M, the largest space amounts to 1km. 3.

1 hardware is configured 3.

1 operation station is being controlled indoor set two labour to accuse the computer to operate a station as man-machine interface, among them one can stand as systematic program manager. Labour accuses engine is main configuration is: P Ⅲ 1.

Hard disk of memory of 3CPU, 256MB, 40G and 19 " pure smooth CRT, accuse in labour machine insert net of a Controllerlink gets stuck -- 3G8F5-CLK21, use at mixing PLC communication. What printer uses at forms for reporting statistics of main craft parameter is time print. 3.

2PLC module configures the I/O unit that provides in PLC to be as follows: Imitate quantity input is unit -- C200H-AD003 (20mA of 8 passageways, 4 ～ is inputted) thermal resistance inputs module -- C200H-TS102 (signal of 4 passageways, thermal resistance is inputted) thermocouple inputs module -- C200H-TS002 (signal of 4 passageways, thermocouple is inputted)  imitate quantity inputs unit -- C200H-DA004 (8 passageways, 4.

3 transducer  mix pump of frit of refine machine, feeding machine, be in harmony and pelleter to be controlled by 4 transducer respectively, among them transducer of pump of frit of be in harmony is high-pressured transducer. 3.

2 software form systematic software to if the graph is shown 3 times,be formed. Below WindowsNT operating system, assemble those who be like next introductions each software.  　 3.

On  of 1 operating system melt closely question of  of Tao of た teaching ü seeks Zhuang to provide dinner for 0 Chinese of  of IndowsNT4 of of  of small this world edition operating system. WindowsNT system has Windows already friendly and the interface that uses easily, provide the security of methodical dependability and data again. 3.

The RSView32 that software of monitoring of system of 2 monitoring software uses company of software of Er of American Luoke Wei to develop (Chinese edition) industrial configuration software, be a kind of compositive type, the man-machine interface software that package converts, it moves at the operating system such as Windows95/98/2000/NT to fall, can realize surveillance and control automation equipment and process. Its are OK very the formation that completes craft monitoring picture conveniently, data is collected in real time, watch of alarm of trend record analysis, newspaper is printed wait for the task. This configuration software still has very strong network browser the programming language of compositive function, built-in standard (VB) , online help, support the function such as form of image of real time video and built-in word processing, electron and ActiveX text. The main craft parameter that systematic monitoring software basically completes pair of installation and moving condition parts to undertake surveillance with the form of craft picture and form, be installed in the picture and the adjustment of loop of surveillant and main control is parameter and process, right main appearance data undertakes the trend is recorded, call the police record and interlocking. 3.

3OPC software OPC (use at process pilot OLE) it is an industry standard, the OLE that is based on Microsoft (present ActiveX) , COM (component object model) with DCOM (model of distributed component object) technology. OPC includes the standard part of interface of one a complete set of, attribute and method, use at process control and system of manufacturing industry automation. ActiveX/COM technology defines all sorts of different software how to is the component used interactively and share data. What software or device are used in the process no matter, OPC offerred public port to news report has between varied process control equipment. SYSMACOPCServer is special the OPC software that waits for equipment at OMRON series PLC, use at the data interface of configuration software RSView32 in this system, the data of implementation and PLC is exchanged. 3.

FinsGateWay of software of 4 communication tool is the software of communication interface tool of OMRON series PLC, basically use at the computer and PLC the management between all sorts of communication networks, offer the data port that builds communication. In this system, its basically are used at the between communication control of the computer and PLCControllerlink net and data management, can get stuck to Controllerlink net in its software -- 3G8F5-CLK21 undertakes set kimono Wu is opened stop control. 3.

CX-Programmer of software of 5 process designing is program of the software process designing of OMRON company PLC, debugging aids, its move in Windows98 ＼ NT below the operating system, the operation environment that has rich, right on the money and powerful process designing, debug a function. The SYSMACCS1 series PLC of OMRON has richer instruction system, its include relay timer and instruction, tally instruction, computation instruction (include operation of trigonometric function, index, power to wait) , data changeover, diagnose, displacement register, quite, data is deferent, the instruction such as programme controll and PID control. Use these instructions to the data of parameter of achievable extruder equipment is collected and be handled namely; Of order and electric machinery of equipment of logistic and interlocking control open stop; The PID of each main loop adjusts control. 4 last words this system moves at was being thrown in June 2002, of the observation that passes a few months and control parameter after fumbling ceaselessly, equipment moving stability is reliable, and in obtain facility when top yield, the quality that also can satisfy a variety of brand products asks, improved manufacturing efficiency greatly, got favorable result. CNC Milling CNC Machining