CN1743122A - Pneumatic suspension spot-welding machine controller for car body welding - Google Patents
Pneumatic suspension spot-welding machine controller for car body welding Download PDFInfo
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- CN1743122A CN1743122A CN 200510029650 CN200510029650A CN1743122A CN 1743122 A CN1743122 A CN 1743122A CN 200510029650 CN200510029650 CN 200510029650 CN 200510029650 A CN200510029650 A CN 200510029650A CN 1743122 A CN1743122 A CN 1743122A
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Abstract
A pneumatic lifttype spot welder controller used for saloon body welding, which has two relatively independent control systems, the first system comprises displacement sensor module, data sampling module, control module, system interface module. The second system is normal control system, which comprises main control board, triggering board, I/O board. The displacement sensor module samples the thermal expansion displacement signal and sends it to the data sampling module which changes the analog signals sent by the displacement sensor module into digital signals and then sent to the control module. The control module can change the current of welding according to predefined control arithmetic and the real-time collected thermal expansion displacement data.
Description
Technical field
What the present invention relates to is a kind of equipment of welding technology field, particularly a kind of pneumatic suspension shot welder controller that is used for the coachbuilt body welding.
Background technology
The manufacturing of car body is welded by hundreds of shapes and thin-slab structure spare not of uniform size, that punching press is good, is resistance spot welding form in the welding procedure and welding is adopted.Because the particularity of structure and pursue body lightening in recent years and use thin sheet material more, when this just makes design, in order to guarantee the car body quality, with the solder joint of weldment arrange closeer.; on workpiece; because the close together between solder joint and the solder joint; usually caused the electric current shunting of mash welder; consequently nugget diminish, insufficient strength; exist the quality of welding spot of part defective, in addition, also usually can cause the electric current shunting to produce bad result in the production because of the variation of electrode tip wearing and tearing and material surface state.In the production, normally used is pneumatic suspension shot welder, and its controller mainly is made up of master control borad, trigger board, I/O plate, wherein, master control borad is a core, groundwork is all finished by it, comprises the adjusting welding current, weld interval, the parameter adjustment of display floater, the selection of welding valve, the selection of welding procedure etc., its control method is constant current control; Trigger board then is that master control borad and high-power thyristor circuit are kept apart, the triggering signal amplification conditioning of on the one hand master control borad being sent is the triggering signal of IGCT, realize the reliable triggering of IGCT, the current value that to gather in real time again simultaneously feeds back to master control borad, foundation as constant current control, it also has a job exactly the rhythm of line voltage and master control borad to be united, and synchronizing signal promptly is provided; The I/O plate is mainly used to and the outside weldings valve, the start-up control device, and part combinations such as fault alarm provide signal to master control borad.This class constant current control only is stable within the specific limits welding current virtual value in the welding transformer secondary loop, it is to the factor such as the mains fluctuations of the current parameters that influences the secondary loop, secondary loop middle impedances such as sheet metal thickness variation are relatively more responsive, can recompense, and in next solder joint realization, so, the constant-current controller of pneumatic suspension shot welder can not be controlled the current electric current of solder joint, as because the current value in solder joint overstocked electric current when shunting of causing reduces the irrelevant influence factor of welding current in the variation etc. that can not eliminate electrode tip wearing and tearing and material surface state and the transformer secondary output loop.
Find through literature search prior art, Chinese patent (application) number is: 98102915.9, name is called: the control system and the method thereof that are used for resistance spot welding, the control system that the memory that this of invention employing stores one group of standard dynamic resistance curve comes the controlling resistance point quality, it is fixed that the certain criteria dynamic resistance curve comes according to predetermined welding condition, this given welding condition is then decided by the welding parameter as by the thickness etc. of weldering metallic plate, that is to say, when this control system is welded the varied in thickness of metallic plate to quilt, control welding current by the standard of comparison dynamic resistance curve, to the electric current shunting that causes owing to solder joint is overstocked, the electrode tip wearing and tearing, it is uncontrollable that current value during the variation of material surface state changes.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, propose a kind of pneumatic suspension shot welder controller that is used for the coachbuilt body welding.Current value during electric current shunting that the electric current shunting that makes its current value that can control solder joint overstocked electric current when shunting of causing effectively and cause because of the electrode tip wearing and tearing and the variation of material surface state cause.
The present invention is achieved by the following technical solutions, controller of the present invention is made up of the relatively independent control system of two covers, the first cover control system is based on the theoretical design of thermal expansion displacement and based on the pid control algorithm spot welding control system, is made up of displacement sensor module, data acquisition module, control module, system interface module; The second cover control system is a classical control system, is made up of master control borad, trigger board, I/O plate.
The first cover control system is the core of controller of the present invention, and wherein, displacement sensor module is used for the collection of thermal expansion displacement signal.The analog signal (magnitude of voltage) that data acquisition module is used for displacement sensor module is transmitted is converted into the data signal that digital display circuit can be discerned.Control module is used for calculating the triggering angle size that needs according to predetermined control algolithm and the thermal expansion displacement data that collects in real time, regulates the triggered time of IGCT, thereby changes welding current, reaches the purpose that improves quality of welding spot.And system interface module is used to switch the work of two systems, from the original system intercept signal, simultaneously the synchronizing signal of two systems is united, and allows their co-ordination, promptly the same time have only a system control signal in action.
Two cover control systems adopt the parallel system working method: after system's startup work, the second cover classical control system enters normal operation, the function of the first cover control system performance monitoring.As when shunting took place, the second cover control system will be ineffective in that solder joint is overstocked, system automatically switches to the first cover control system, and at this moment, the first cover control system just begins to work.
Described data acquisition module, by single-chip microcomputer, A/D converter, sampling holder is formed, single-chip microcomputer is connected with outside expansion by latch with control module as the arithmetic element of system, outside expansion is main storage of collected data and the intermediate operations result of being responsible in system, also passed through latch between single-chip microcomputer and the A/D converter, the RAM that during collection A/D converter is regarded as several outsides, thereby directly carry out reading of AD conversion and data, external signal enters A/D converter conversion by sampling holder, the scope of the analog signal of native system is ± 5V that the connection of A/D converter is the connection of bipolarity 10 scopes.
Described control module, form by SCR trigger pulse screened circuit and trigger impulse amplifying circuit, wherein: as the SCR trigger pulse screened circuit in the interface circuit, switch when selecting for use two relay TQ2 Form C to realize whole four groups of signals, two relays use independently amplifying circuit separately, and their coil is controlled by the I/O mouth P1.0 and the P1.1 of single-chip microcomputer respectively; The two-way SCR trigger pulse signal that the trigger impulse amplifying circuit is sent by single-chip microcomputer P1.2 and P1.3 is a pin 2,4 through the input that draws the back to insert A, two drivers of B among the FET driver TC4426 on the 10K resistance, through power amplification after by the TC4426 output be pin 7,5 send to the back to screened circuit; If screened circuit switches to new system, then this signal finally is used to trigger controllable silicon by screened circuit arrival controllable silicon trigger board.
Described control module, be to be based upon on the basis of data acquisition, after data acquisition module is delivered to the thermal expansion displacement acquisition among the CPU, handle by its advanced line number, the result that will obtain imports control algolithm then, characterize the former second cover control system if the real-time displacement signal that records is positioned at the tolerance range scope working properly, the first cover control system just plays the effect of monitoring, in case and real-time displacement out-of-size band scope, then displacement is input in the control corresponding algorithm, obtain the control corresponding angle, cut off the trigger impulse of original system at next half-wave by screened circuit, and change by the first cover control system at definite trigger impulse that constantly sends, by pulse amplifying circuit the signal driving force is strengthened then, drive the MOSFET power tube on the trigger board, thereby drive IGCT, weld.
Described system interface module, comprise synchronous circuit and serial communication circuit, synchronous circuit also is referred to as the sync break signal generating circuit, it mainly is to close the external interrupt that key control coherent signal constantly carries out level conversion and gives single-chip microcomputer with characterizing, thereby realization single-chip microcomputer and silicon controlled work are synchronous and control sequential coupling; Serial communication circuit realizes with the single-chip microcomputer being the first cover control system of core and the mutual communication of serial ports of industrial computer.
Current value when the present invention can control the electric current shunting that causes when solder joint is overstocked effectively, current value in the time of controlling the electric current shunting that the electric current that causes because of the electrode tip wearing and tearing is shunted and the variation of material surface state causes effectively, thereby the performance of change pneumatic suspension shot welder.When making it be used for the coachbuilt body welding, solved the electric current shunting of the mash welder that causes because of the close together between vehicle body solder joint and the solder joint, nugget diminishes, the defective problem of the quality of welding spot of insufficient strength thereby cause; The nugget that has produced when having solved the electric current shunting that the electric current that causes because of the electrode tip wearing and tearing is shunted and the variation of material surface state causes diminishes, the defective problem of quality of welding spot of insufficient strength, use the present invention, existing pneumatic suspension shot welder scene is undergone technological transformation, do not influence production, cost-saved.
Description of drawings
Fig. 1 controller architecture block diagram of the present invention
Fig. 2 data acquisition module structured flowchart of the present invention
Screened circuit schematic diagram in Fig. 3 control module of the present invention
Trigger impulse amplification circuit diagram in Fig. 4 control module of the present invention
The logic diagram of 8 path analoging switch CD4051 in Fig. 5 system interface module of the present invention
Sync break signal generating circuit schematic diagram in Fig. 6 system interface module of the present invention
MAX232 circuit connection diagram in Fig. 7 system interface module of the present invention
Communicating circuit connection layout in Fig. 8 system interface module of the present invention
The specific embodiment
As shown in Figure 1, controller of the present invention is made up of the relatively independent control system of two covers, the first cover control system is based on the theoretical design of thermal expansion displacement and based on the pid control algorithm spot welding control system, is made up of displacement sensor module, data acquisition module, control module, system interface module; The second cover control system is a classical control system, is made up of master control borad, trigger board, I/O plate.
The first cover control system is a core of the present invention, wherein, displacement sensor module is gathered the thermal expansion displacement signal and is passed to data acquisition module, the analog signal that data acquisition module transmits displacement sensor module is converted into the data signal that digital display circuit can discern and passes to control module, control module is according to predetermined control algolithm and the thermal expansion displacement data that collects in real time, calculate the triggering angle size that needs, regulate the triggered time of IGCT, thereby change welding current, and the result that will handle passes to system interface module, system interface module passes the signal to the second cover classical control system, be used to switch the work of two systems, from the original system intercept signal, simultaneously the synchronizing signal of two systems is united, co-ordination, promptly the same time have only a system control signal in action, the sequential coupling between the two cover control systems is finished by system interface module.
Two cover control systems adopt the parallel system working method, and after system's startup work, the second cover classical control system enters normal operation, the function of the first cover control system performance monitoring.As overstocked at solder joint or and when shunting took place, the second cover control system will be ineffective, system automatically switches to the first cover control system, at this moment, the first cover control system just begins to work.
(1) displacement sensor module
Displacement sensor module is made up of displacement transducer, and displacement transducer is gathered the thermal expansion displacement signal.What the present invention selected for use is Japan OMRON ZX-LD30V sensor; Its response time:＜1ms (half cycle=10ms), certainty of measurement :≤1um (the total displacement amount is about 100 microns), easily mounting or dismounting, electromagnetic shielding.
(2) data acquisition module
As shown in Figure 2, data acquisition module is made up of single-chip microcomputer, A/D converter, sampling holder, single-chip microcomputer is connected with outside expansion by latch with control module as the arithmetic element of system, because inside 128 byte RAM capacity of single-chip microcomputer itself is not enough, and the data volume of gathering is bigger, and outside expansion is main storage of collected data and the intermediate operations result of being responsible in system.And also passed through latch between single-chip microcomputer and the A/D converter, A/D converter can be regarded as the RAM of several outsides during collection, thereby directly carry out reading of AD conversion and data.External signal enters A/D converter conversion by sampling holder, can further improve the speed and the precision of conversion like this.The scope of the analog signal of native system is ± 5V, so the connection of A/D converter also is the connection of bipolarity 10 scopes.
Single-chip microcomputer adopts the AT89c51 single-chip microcomputer of atmel corp, its speed: 1MPS, the crystal oscillator of cooperation 12MH; Have 4 interrupt priority levels, 6 interrupt sources, 48 I/O, have the serial communication ability: full duplex enhancement mode UART.
A/D converter adopts quick 12 the successive comparison A/D converters of AD574A type of ADI (Analog Devices Inc), the inner accurate encapsulation of forming by the ambipolar circuit of biplate of 28 footnotes, need not outward element and just can independently finish the A/D translation function, inside is provided with ternary data output latch, concrete technical parameter: nonlinearity erron less than ± 1/2LBS or ± 1LBS; Be 25 microseconds a conversion time; Power supply is supplied with and is ± 12V and+5; The input analog amount range ability of AD574A has 0-+10v, 0-+20v ,-5v-+5V and-four kinds of 10V-+10V.
Sampling holder adopts LF398 ic core chip sample/hold circuit, guarantee to gather the stability of displacement data in the transition period, can stablize the maintenance input signal in 6us, be the feedback-type sample/hold circuit, adopts ambipolar-technotron technology.
(3) control module
Control module is made up of SCR trigger pulse screened circuit and trigger impulse amplifying circuit, wherein:
As shown in Figure 3, as the SCR trigger pulse screened circuit in the interface circuit, owing to need four group pulse triggering signals on the controllable silicon trigger board, so switch when selecting for use in the screened circuit two relay TQ2 Form C to realize whole four groups of signals, for the purpose of reliable, two relays use independently amplifying circuit separately, and their coil is controlled by the I/O mouth P1.0 and the P1.1 of single-chip microcomputer respectively.
As shown in Figure 4, the trigger impulse amplifying circuit inserts the input (pin 2,4) of A, two drivers of B among FET driver (MOSFET DRIVER) TC4426 by the two-way SCR trigger pulse signal that single-chip microcomputer P1.2 and P1.3 send through drawing the back on the 10K resistance.Through power amplification after by TC4426 output (pin 7,5) send to the back to screened circuit.If screened circuit switches to new system, then this signal finally is used to trigger controllable silicon by screened circuit arrival controllable silicon trigger board.
Control module is to be based upon on the basis of data acquisition, after acquisition module is delivered to the thermal expansion displacement acquisition among the CPU, handle by its advanced line number, as software filtering or the like, the result that will obtain imports control algolithm then, characterize the second cover control system if the real-time displacement signal that records is positioned at the tolerance range scope working properly, do not need control, the first cover control system just plays the effect of monitoring, in case and real-time displacement out-of-size band scope, then displacement is input in the control corresponding algorithm, obtain the control corresponding angle, cut off the trigger impulse of original system by screened circuit at next half-wave, determining constantly to send trigger impulse and change, by pulse amplifying circuit the signal driving force is being strengthened then, can drive the MOSFET power tube on the trigger board like this by the first cover control system, thereby the driving IGCT welds.
(4) system interface module
Concrete control parameter is exactly directly to have determined the controllable silicon of welding current size to trigger the angle, and for the displacement information that will gather in real time be presented at intuitively need in face of the operator with information real-time pass to a device with Presentation Function, also to send the running parameter of current constant-current system to SCM system simultaneously by this device, so the whole welding system that the present invention controlled is equipped with the industrial computer with real time information Presentation Function.This wherein, because the thyristor gating circuit of SCM system and mash welder is not the circuit of same type, so must being arranged, an intermediate circuit is responsible for the co-ordination of these two circuit each side, can successfully be sent to silicon controlled circuits for triggering plate with the control signal that guarantees single-chip microcomputer and control controllable silicon, relevant feedback signal on the controllable silicon trigger board also can be discerned by single-chip microcomputer smoothly simultaneously, and SCM system also needs to carry out information interchange with industrial computer system, and this part work is finished by system interface module.In sum, system interface module must be realized following two functions, sequential coupling and communication function.According to above functional requirement, system interface module is divided into two littler modules.Be respectively synchronous circuit and serial communication circuit, wherein:
1. synchronous circuit
Also be referred to as the sync break signal generating circuit, it mainly is to close the external interrupt that key control coherent signal constantly carries out level conversion and gives single-chip microcomputer with characterizing, thereby realization single-chip microcomputer and silicon controlled work are synchronous and control sequential coupling.Specifically shown in 8 path analoging switch CD4051 logic diagrams of synchronous circuit in Fig. 5 system interface module of the present invention, solved the problem of the interior twice triggering interruption of one-period of the synchronous square-wave signal in the synchronous circuit, specifically: middle fracture is finished by 8 path analoging switch CD4051 the switching selection work of signal A, B, as seen from the figure, CD4051 can have 8 input channels, but have only an output channel, the selection of 8 input channels is to be determined through the decoding back by A, B, this coding of three of C.
As shown in Figure 6, the final principle of the sync break signal generating circuit in the interface microcontroller circuit, the second cover control system controllable silicon high frequency start pulse signal that is used for synchronous conduction time need not directly insert an external interrupt mouth (INTO) of single-chip microcomputer through format change, so do not mark in the drawings.At first hold (pin 5) with the square-wave signal (web tab among the figure " 3 ") that welding power frequency AC signal is synchronous through "+" that insert voltage comparator LM139 after the first order voltage stabilizing of 5V Zener diode.The 2.5V voltage that obtains through two 15K electric resistance partial pressures inserts "-" end (pin 6) of voltage comparator.The Transistor-Transistor Logic level of voltage comparator output is wherein told the phase shift of one road signal through phase inverter 74HC04 by pin 2 outputs.Two groups of complementary signals enter the input channel 0 and 1 (pin 13 and 14) of 8 path analoging switch CD4051 respectively, channel selecting bits of coded B, the C of CD4051 and INHIBIT end ( pin 10,9,6) ground connection, the P1.6 mouth of single-chip microcomputer inserts the switching that channel selecting bits of coded A (pin 11) comes control channel 0 and 1.The interrupt signal that disposes is finally sent into second external interrupt mouth (INT1) of single-chip microcomputer by the output (pin 3) of 8 tunnel simulation CD4051, be achieved the synchronous of welding half-wave.
2. serial communication circuit
The serial communication circuit major function is to realize with the single-chip microcomputer being the new system of core and the mutual communication of serial ports of industrial computer, because single-chip microcomputer itself has the serial communication function.The problem that mainly needs in the design to consider is a real time of data transmission.Because the time of spot welding is very short, the time of solder joint needs is approximately about 200ms, therefore will be in the so short time data in real time of gathering be sent to the industrial computer end, require the processing speed of single-chip microcomputer higher relatively, the crystal oscillator of having joined 12MH in the design to single-chip microcomputer, the instruction execution speed of single-chip microcomputer can reach 1MPS like this, can satisfy the real-time requirement of system.
During serial communication, what the serial port of industrial computer adopted is the RS-232C interface of standard, because the serial port level of single-chip microcomputer is a Transistor-Transistor Logic level, but the electrical characteristic of Transistor-Transistor Logic level characteristic and RS232 does not match, therefore for the serial ports that makes single-chip microcomputer can with the RS-232C interface communication, the I/O level of serial port must be changed.For this reason, selected the integrated circuit block MAX232 of MAXIM company, shown in the MAX232 circuit connection diagram in Fig. 7 system interface module of the present invention, the P3.0 mouth of single-chip microcomputer and P3.1 mouth are connected with the O4 mouth with 12 mouthfuls of MAX232 chip respectively, the RXD of the corresponding serial communication of O2 mouth and I4 mouth, the TXD line.Other elements connect as shown in the figure, constitute 232 mouthfuls of output interfaces of single-chip microcomputer.
With integrated chip MAX232 be the communicating circuit connection layout that constitutes of core as shown in Figure 8.Adopt the communication modes of 3 line systems.
Claims (10)
1, a kind of pneumatic suspension shot welder controller that is used for the coachbuilt body welding, comprise: the second cover control system, by master control borad, trigger board, the I/O plate is formed, it is characterized in that, also comprise: the first cover control system, the first cover control system is by displacement sensor module, data acquisition module, control module, interface module is formed, displacement sensor module is gathered the thermal expansion displacement signal and is passed to data acquisition module, the analog signal that data acquisition module transmits displacement sensor module is converted into the data signal that digital display circuit can discern and passes to control module, control module is according to predetermined control algolithm and the thermal expansion displacement data that collects in real time, calculate the triggering angle size that needs, regulate the triggered time of IGCT, thereby change welding current, and the result that will handle passes to system interface module, system interface module passes the signal to the second cover classical control system, be used to switch the work of two systems, from the original system intercept signal, simultaneously the synchronizing signal of two systems is united, co-ordination, be have only a system the same time control signal in action, the sequential coupling between the two cover control systems is finished by system interface module.
2, the pneumatic suspension shot welder controller that is used for the coachbuilt body welding according to claim 1, it is characterized in that, two cover control systems adopt the parallel system working method: after system's startup work, the second cover control system enters normal operation, and the first cover control system is monitored, and is overstocked and when shunting takes place at solder joint, the second cover control system will be ineffective, system automatically switches to the first cover control system, and at this moment, the first cover control system just begins to work.
3, the pneumatic suspension shot welder controller that is used for the coachbuilt body welding according to claim 1 is characterized in that described displacement sensor module is made up of displacement transducer, and displacement transducer is gathered the thermal expansion displacement signal and passed to data acquisition module.
4, the pneumatic suspension shot welder controller that is used for the coachbuilt body welding according to claim 1, it is characterized in that, described data acquisition module, by single-chip microcomputer, A/D converter, sampling holder is formed, single-chip microcomputer is connected with outside expansion by latch with control module as the arithmetic element of system, outside expansion is main storage of collected data and the intermediate operations result of being responsible in system, also passed through latch between single-chip microcomputer and the A/D converter, the RAM that during collection A/D converter is regarded as several outsides, thereby directly carry out reading of AD conversion and data, external signal enters A/D converter conversion by sampling holder.
5, the pneumatic suspension shot welder controller that is used for the coachbuilt body welding according to claim 1, it is characterized in that, described control module, form by SCR trigger pulse screened circuit and trigger impulse amplifying circuit, wherein: as the SCR trigger pulse screened circuit in the interface circuit, switch when selecting for use two relay TQ2Form C to realize whole four groups of signals, two relays use independently amplifying circuit separately, and their coil is controlled by the I/O mouth P1.0 and the P1.1 of single-chip microcomputer respectively; The two-way SCR trigger pulse signal that the trigger impulse amplifying circuit is sent by single-chip microcomputer P1.2 and P1.3 is a pin 2,4 through the input that draws the back to insert A, two drivers of B among the FET driver TC4426 on the 10K resistance, through power amplification after by the TC4426 output be pin 7,5 send to the back to screened circuit; If screened circuit switches to new system, then this signal finally is used to trigger controllable silicon by screened circuit arrival controllable silicon trigger board.
6, according to claim 1 or the 5 described pneumatic suspension shot welder controllers that are used for the coachbuilt body welding, it is characterized in that, described control module, be to be based upon on the basis of data acquisition, after data acquisition module is delivered to the thermal expansion displacement acquisition among the CPU, handle by its advanced line number, the result that will obtain imports control algolithm then, characterize the former second cover control system if the real-time displacement signal that records is positioned at the tolerance range scope working properly, the first cover control system just plays the effect of monitoring, in case and real-time displacement out-of-size band scope, then displacement is input in the control corresponding algorithm, obtain the control corresponding angle, cut off the trigger impulse of original system at next half-wave by screened circuit, and change by the first cover control system at definite trigger impulse that constantly sends, by pulse amplifying circuit the signal driving force is strengthened then, drive the MOSFET power tube on the trigger board, thereby drive IGCT, weld.
7, the pneumatic suspension shot welder controller that is used for the coachbuilt body welding according to claim 1, it is characterized in that, described system interface module, comprise synchronous circuit and serial communication circuit, synchronous circuit also is referred to as the sync break signal generating circuit, it mainly is to close the external interrupt that key control coherent signal constantly carries out level conversion and gives single-chip microcomputer with characterizing, thereby realization single-chip microcomputer and silicon controlled work are synchronous and control sequential coupling; Serial communication circuit realizes with the single-chip microcomputer being the first cover control system of core and the mutual communication of serial ports of industrial computer.
8, the pneumatic suspension shot welder controller that is used for the coachbuilt body welding according to claim 7, it is characterized in that, described sync break signal generating circuit, the problem that twice triggering interrupted in the one-period that adopts 8 path analoging switch CD4051 logic circuits to switch to solve the synchronous square-wave signal in the synchronous circuit, middle fracture is to signal A, the switching selection work of B is finished by 8 path analoging switch CD4051, CD4051 has 8 input channels, but have only an output channel, the selection of 8 input channels is by A, B, this coding of three of C determines through the decoding back.
9, according to claim 7 or the 8 described pneumatic suspension shot welder controllers that are used for the coachbuilt body welding, it is characterized in that, described sync break signal generating circuit, the second cover control system controllable silicon high frequency start pulse signal that is used for synchronous conduction time directly inserts an external interrupt mouth INT0 of single-chip microcomputer, the square-wave signal synchronous with welding power frequency AC signal is pin 5 through "+" end that inserts voltage comparator LM139 after the first order voltage stabilizing of 5V Zener diode at first, "-" end that the 2.5V voltage that obtains through two 15K electric resistance partial pressures inserts voltage comparator is a pin 6, the Transistor-Transistor Logic level of voltage comparator output is wherein told the phase shift of one road signal through phase inverter 74HC04 by pin 2 outputs; The input channel 0 and 1 that two groups of complementary signals enter 8 path analoging switch CD4051 respectively is pin 13 and 14, channel selecting bits of coded B, the C of CD4051 and INHIBIT end are pin 10,9,6 ground connection, it is the switching that pin 11 comes control channel 0 and 1 that the P1.6 mouth of single-chip microcomputer inserts channel selecting bits of coded A, the interrupt signal that disposes is second external interrupt mouth INT1 that pin 3 is sent into single-chip microcomputer by the output of CD4051 finally, is achieved the synchronous of welding half-wave.
10, the pneumatic suspension shot welder controller that is used for the coachbuilt body welding according to claim 7, it is characterized in that, described serial communication circuit, selected the integrated circuit block MAX232 of MAXIM company, and adopt the communication modes of 3 line systems, the I/O level of serial port is changed, thereby make single-chip microcomputer serial ports can with the RS-232C interface communication, the P3.0 mouth of single-chip microcomputer and P3.1 mouth are connected RXD, the TXD line of the corresponding serial communication of O2 mouth and I4 mouth with 12 mouthfuls of MAX232 chip with the O4 mouth respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 200510029650 CN1743122A (en) | 2005-09-15 | 2005-09-15 | Pneumatic suspension spot-welding machine controller for car body welding |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200510029650 CN1743122A (en) | 2005-09-15 | 2005-09-15 | Pneumatic suspension spot-welding machine controller for car body welding |
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| CN1743122A true CN1743122A (en) | 2006-03-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103747910A (en) * | 2011-05-26 | 2014-04-23 | 热动力公司 | System for and method of generating a weld with selection of weld control algorithms according to set voltage magnitude |
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2005
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103747910A (en) * | 2011-05-26 | 2014-04-23 | 热动力公司 | System for and method of generating a weld with selection of weld control algorithms according to set voltage magnitude |
| CN103747910B (en) * | 2011-05-26 | 2016-03-16 | 维克托设备公司 | Produce the system and method for the welding with the welding control algolithm selected according to setting voltage amplitude |
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