Communication servo digitlizes the application in resistance welding machine in high speed

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Summary: The positional servo synchronism that is based on bus line form to be comprised by PLC and communication servo dogs the system can make a machine can fast synchronous, welder of resistor of implementation high speed digitlizes a process to control. Through controlling communication servo electromotor by PLC system of much axis linkage replaces traditional mechanical couplet to move an orgnaization, realize the harmony that the machine moves between each motion, assure each relevant movements can fast and accurate synchronism moves, make each motion concerns not only between " mechanical lock closes " change is " electronic lock closes " , the complex rigid structure such as machine of cam, infinitely variable speeds and versatile shaft coupling simplifies in the meantime, systematic dependability, improve overall character of service thereby. Keyword: Communicate servo; PLC; Synchronism dogs; Bus line Application Of AC Servo System In High Speed Digital Can Body Resistance Welding MachineZHENG Zhi-dan1, CHEN Shao-bo1, ZHANG Zi-qiang1, YAN Qiu-sheng2 (1. Key Laboratory Of Intelligent Manufacture Technology Of Ministry Of Education, shantou University, shantou 51 5063, china; 2. Electronic Engineering of ＆ of Faculty Of Mechanical, guangdong University Of Technology, guangzhou 51 0080, china) Abstract: The Application Of Position Servo Synchronously Tracking System Constituted With PLC Andgeneral AC Servo System Base On Bus Can Help Machines Quickly And Precisely Run Synchronouslyin High-speed Digital Can-body Resistance Welding Machine. By The Applicationof PLC In Co Ntrolling General AC Servo Motor Multi-axes Ganged System To Replac Co Nventionalmechanical Ganged Mechanism, the Coordination Of Movements Between Machineactions Can Be Ensured And Every Correlative Actions Can Quickly And Precisely Runsynchronously, and Mechanica L-locking Betw Een Quondam Movements Can Be Changed Tothe Lectronic-locking, and The Complex Mechanical Structures Such As Cams, stepless Speedchanging Machines And Universal Joints Can Be Omitted, so The Reliability, stability Andmanufacturing Eficiency Of The Machine Can Be Enhanced Actively. Key Words: AC Servo System; PLC; Synchronously Tracking; The machines and tools of resistance welding of transmission structure high speed of welder of resistor of Bus1 typical high speed has the high speed action with complex multichannel, at the same time the requirement has accurate mutual linkage to concern, use coupling device of mechanical drive tigidity to come true more. Graph 1 it is sketch map of drive of typical resistor welder: By advocate electric machinery (11) through gear gear-box (12) drive many relevant movement systems. [1] 　 among them, system sending coal tub is a machine advocate athletic system, say to solder metre moves, its motion rate is main by minutely the canister that can solder counts a decision. Through by gear gear-box (12) , worm decelerate machine (2) , versatile shaft coupling (1) , cam device (13) drive carries chain (14) motion, use the falcula that carries chain to go up hang down condole sends the position that make jar at the coal tub cylindrical shell inside groove. System of copper cash drive by gear gear-box (12) through machine of infinitely variable speeds (4) , worm decelerate machine (5) drive solder annulus (8) reach much trough annulus (6) drive copper cash is made all fast motion, the athletic speed of copper cash basically reachs decision of height of can without lid by metre speed. Suck the system that elect iron from gear gear-box (12) through machine of infinitely variable speeds and worm decelerate machine (10) drive orgnaization of brace slide block to make suck the motion that elect iron, absorb sheet on time according to metre sending coal tub and send round orgnaization to have a circle, the park of coal tub cylindrical shell after becoming a circle transfers be in inside the groove of guide block hang down condole condition. The system that make jar by gear gear-box (12) reach cam unit through versatile shaft coupling (9) drive the move about arm that make jar (7) complete the action that make jar, should send coal tub the orgnaization coal tub simplified send after appointing the position, the move about arm that make jar is inside formulary time namely coal tub simplified hit into solder the position. Suck in whole job process, elect iron, carry chain (send coal tub) , the move about arm that make jar (make jar) wait for a requirement to more accurate harmonious movement concerns, because this is mechanical the structure is relatively complex, among them machine of infinitely variable speeds, versatile shaft coupling and cam because the structure is complex, workpiece machines difficulty, and wear away easily in use process, become the main reason that precision drops and primary failure source. To simplify machine of cam device, infinitely variable speeds is mixed the complex rigid structure such as versatile shaft coupling, use the positional servo synchronism that comprises by PLC and communication servo to dog control system, with electric and flexible the rigid and synchronous drive that synchronous drive replaces machine, simplify transmission structure of the system, raise systematic dependability, improve overall character of service thereby. [The positional servo synchronism that the composition of 2]2 control system comprises through PLC and communication servo dogs if the principle picture that dominates a system to control resistance welding machine pursues 2 are shown, all servo electric machinery choose the servo electric machinery that takes decelerate chance. M1 is the servo electric machinery that drive sends coal tub system to carry chain, use the contented that carries chain to go up to make falcula will hang down a string of 1 at transferring the simplified and accurate ground of groove sends to the position that make jar, implementation sends coal tub the function. M1 serves as a system advocate motion, its motion rate is main by solder rate decision, offer the set value of traversal speed through 422 bus line by PLC, m1 moves in speed to control mode. M2 of Nextpage 　 　 is the servo electric machinery that drive sucks the system that elect iron, undertake suction by orgnaization of slide block of M2 drive brace, push iron to send makings motion, m2 every turn a week, the system is finished suck iron to reach those who elect iron to send makings motion, its action is to will press metre a piece a piece of accurate ground send a regulation locally, by the orgnaization that become a circle the will laminose curly can without lid that become a circle. M3 is the servo electric machinery that drive makes coal tub move about arm move, m3 drives plane 7 lever orgnaization makes the motion that make jar, implementation plays coal tub function, orgnaization every movement a week, complete the action that make jar namely. As a result of M2, M3 must accurate cooperate to coordinate M1 to move, also namely the moving condition that M2 needs fibrous root occupies M1, punctual send sheet to the orgnaization that become a circle, curly hind send exact position with type of round can bodily form; Same M3 needs fibrous root occupies the moving position of M1, punctual hit can without lid into solder the position. Because this M2, M3 moves in the position to control mode, the positional instruction that the pulse signal that outputs by the pulse coder of electric machinery of M 1 servo regards M2, M3 as inputs pulse signal, want to adjust the gain of annulus of position of good M2, M3 only so, m2, M3 can dog M1 moves, achieve the goal that synchronism dogs thereby. S1, S2, S3 is to suck respectively, elect iron, carry the chain, move about arm that make jar the position detected at 0 o'clock sensor, respectively couplet receives PLC interrupt input port, use at corrective of each orgnaization at 0 o'clock the position. Advanced travel falls in the control of PLC when the system is started every time the position is corrective at 0 o'clock, it is in systematic moving process undertake detecting to the position of Sl, S2, S3 ceaselessly, undertake to the gain of M2, M3 synchronism is adjusted, achieve the goal that controls systematic synchronism thereby. [31M4 is electric machinery of servo of copper cash drive, move in speed to control mode, its traversal speed is decided by height of the metre that make jar, can without lid, because use servo electric machinery to regard the drive of copper cash as electric machinery, accordingly copper cash moves relatively smooth, do not need basically to adjust. M5, M6 is to put line and electric machinery of frequency control receiving a line respectively, because copper cash passes squash, solder it is certain to after giving out heat, can have adjustable, because this needs to control the rotate speed of electric machinery, achieve the goal that controls copper cash Zhang Jin, PID of the buy inside belt of the choice in this system adjusts functional frequency control implement, the speed of transducer gives signal by PLC through bus line form, the Zhang Jin degree of copper cash gives transducer by sensor feedback, adjust by the PID of the buy inside transducer the function undertakes modulatory controlling, because this wants only,the concerned parameter of good in the set in the system transducer can achieve the goal that commands copper cash pulling force. Because was used inside buy PID adjusts functional transducer undertakes modulatory controlling, reduced module of the A ／ D of PLC and D ／ A thereby, also reduced PLC to undertake modulatory at the same time the burden of operation, rose to adjust speed. Main job flow controls 3 control system accordingly main job flow is like the system the graph shows 3 times: When the system is started every time undertake null automatically first corrective, all orgnaizations all begin the work from null. Next PLC basis the speed making jar of set, control sends M1 of electric machinery of coal tub servo movement. The input of signal of pulse of position of the M2 of servo electric machinery that the cent of output pulse signal of the pulse coder of M1 of servo electric machinery sends the job 2 times to control mode at the position respectively, M3 is carried, make M2, M3 dogs of M1 move. In the error information that the PLC in locomotive process feedbacks according to null, will adjust control M2, M3 dogs M1 runs. Control thereby suck, push the iron, movement that sends coal tub to reach dozen of canister to coordinate a relation. In the meantime, PLC reachs the traversal speed of the copper cash of altimeter cipher out of can without lid according to making coal tub career, control much slot of drive of M4 of servo electric machinery annulus drive copper cash to press give speed to make all fast move. Put the traversal speed of line and electric machinery of frequency control receiving a line by PLC plan cipher out according to the traversal speed of copper cash, PLC offers a speed to give signal to transducer through 422 bus line likewise, as a result of frequency control implement be the form that introduces RS485 bus line, install because of needing to add on this bus line in transducer 422 turn the bus line converter of 485. The gives speed and sensor of copper cash Zhang Jin feedback of PLC is worth transducer basis, use the PID that takes oneself to adjust the function has P1D adjustment operation, make sure copper cash can be automatic thereby fast Zhang Jin. Because use frequency control implement the PID that takes oneself adjusts function, moving stability is accordingly reliable, and adjust convenient, want set only good concerned parameter can. The torsion that uses servo electric machinery limits a function, according to M1, M2, M3 the working property of 3 electric machinery differs to undertake to servo electric machinery different torsion is restricted respectively, torsion restricts a value to have set directly through bus line form likewise, at the same time the torsion each electric machinery achieves signal to receive the input port of PLC to serve as safe alarm signal, supersede the safe clutch function when mechanical before rigid drive. Because 4 brief summary use bus line form, control construction of system is accordingly simpler, and to go up a machine monitoring and long-range monitoring offerred advantage. Because the system is dogging,undertake dogging compensating to the position directly in the process, because this is compared pure more rapid and the means that uses speed to dog is accurate, make the system can stabilize the job reliably. In the meantime, because use frequency control implement inside the PID of buy undertakes adjusting control is made, because this makes a system more simple, and the operation pressure that reduced PLC. CNC Milling CNC Machining