CN104096949B - Electric shock protection device for electric welding machine - Google Patents
Electric shock protection device for electric welding machine Download PDFInfo
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- CN104096949B CN104096949B CN201410376621.XA CN201410376621A CN104096949B CN 104096949 B CN104096949 B CN 104096949B CN 201410376621 A CN201410376621 A CN 201410376621A CN 104096949 B CN104096949 B CN 104096949B
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- control unit
- electric shock
- welding machine
- electric
- resistance
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
- B23K9/321—Protecting means
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding Control (AREA)
- Relay Circuits (AREA)
Abstract
The invention discloses a kind of electric shock protection device for electric welding machine.Comprise monolithic processor control device, clock pulse control unit, light emitting diode control unit, earth leakage protective control unit, failure reset control unit, electric shock detection control unit.Described clock pulse control unit, light emitting diode control unit, earth leakage protective control unit, failure reset control unit, electric shock detection control unit are all connected with described monolithic processor control device; Described electric shock detection control unit comprises primary power source and control loop and secondary side circuit.Its structure is simple, with low cost, easy to manufacture and handling safety is reliable.Detection weld job personnel that can be reliably real-time, and resistance value between electric welding machine secondary loop, flow through the current value of human body or the safe voltage etc. to human body; When reaching trip condition, welder power can be cut off reliably rapidly, thus ensure that weld job personnel are when getting an electric shock, and can hightail danger, ensure the object of personal life security.
Description
Technical field
The present invention relates to a kind of welder power technology, particularly relate to a kind of for direct current or A.C. welder shock preventing protector of electric.
Background technology
At present, electric welding machine is one of construction equipment be most widely used during modern industry is produced, electric welding machine is the source of welding current equipment converting electrical energy into heat energy, the high-temperature electric arc that it utilizes output two electrode to produce when instantaneous short circuit or electric discharge comes solder on consumable electrode and materials to be welded, to realize the object making them combine.Electric welding machine is widely used in each large industries such as building, shipbuilding, device fabrication, due to the safe voltage of the far super 36V of the higher 60 ~ 90V of electric welder no-load voltage, during weld job, operating voltage needed for pilot arc is at about 16 ~ 35V, exceed the 12V safe voltage in canister or under wet environment, there is larger electric shock accidents hidden danger, particularly under bad welding surroundings as in metal structure, in canister, pipeline or under water, moist place is welded, if welder's health is poor, human body resistance is very low, is easy to cause electric shock accidents.The annual whole nation of data display causes the personnel that cause to injure by electric welding machine according to incompletely statistics, and electric shock accidents is up to more than 600.Especially in summer, workpeople is at high temperature, humidity, sultry cabin (building site) weld job, and volume of perspiration is large, and the life security of welders in serious threat.At present; electric welding machine only has electricity-saving protector; when detecting Light Condition; time delay reduces secondary voltage to 15 ~ 20V; still higher than the 12V safe voltage in the canister of national regulation or under wet environment; therefore, the defencive function of existing electricity-saving protector is very limited, effectively can not avoid the generation of personnel's electric shock accidents.
Summary of the invention
For above-mentioned prior art, the technical problem to be solved in the present invention is to provide a kind of electric shock protection device for electric welding machine.Its structure is simple, with low cost, easy to manufacture and handling safety is reliable.Detection weld job personnel that can be reliably real-time, and resistance value between electric welding machine secondary loop, flow through the current value of human body or the safe voltage etc. to human body; When reaching trip condition, welder power can be cut off reliably rapidly, thus ensure that weld job personnel are when getting an electric shock, and can hightail danger, ensure the object of personal life security.
For solving the problems of the technologies described above; the invention provides a kind of electric shock protection device for electric welding machine, comprise monolithic processor control device, clock pulse control unit, light emitting diode control unit, earth leakage protective control unit, failure reset control unit, electric shock detection control unit.Two pins in described monolithic processor control device are power input, two pin ground connection; Described clock pulse control unit, light emitting diode control unit, earth leakage protective control unit, failure reset control unit, electric shock detection control unit are all connected with described monolithic processor control device; Described clock pulse control unit comprises crystal oscillator and electric capacity, and the external described crystal oscillator of described monolithic processor control device two pins and two described Capacitance parallel connection circuit connect; Described light emitting diode control unit comprises two resistance, two light emitting diodes and power supply, and described two resistance are connected with respective light emitting diode and power circuit respectively; Described earth leakage protective control unit comprises auxiliary reclay, photoelectrical coupler, resistance, power supply and earth leakage protective output relay, and described auxiliary reclay, photoelectrical coupler, resistance, power supply are connected with earth leakage protective output relay circuit; Described failure reset control unit comprises resistance, press button and power supply, and described resistance, press button are connected with VDD-to-VSS circuit; Described electric shock detection control unit comprises primary power source and control loop and secondary side circuit, for detecting insulaion resistance in real time, lower than when presetting standard value, cuts off welder power immediately, ensures to protect personal safety.
As a modification of the present invention, described secondary side circuit comprises additional dc power supply, commutation diode, current-limiting resistance, sampling resistor and soldering turret; Described secondary side circuit is by additional dc power supply, and be connected with respective current-limiting resistance circuit respectively by commutation diode, then be connected with electrode holder line and earth connection circuit respectively, the other end is received on the sheet metal of soldering turret by sampling resistor.
As a further improvement on the present invention; described primary power source and control loop comprise power supply, air switch, shutting-brake control loop and contactor; described power supply by after the air switch of band electric leakage, overcurrent and short-circuit protection to shutting-brake control loop and contactor, then by arriving the primary side loop of direct current or A.C. welder after contactor.Described shutting-brake control loop comprises fuse, protective relay output node, switch knob, opening button, contactor coil.Described shutting-brake control loop is via fuse, and protective relay output node, switch knob, opening button arrive contactor coil, wherein switch knob are parallel with the self-insurance node of contactor.
Compared with prior art, the beneficial effect that the present invention obtains is: at two output (welding grounds of electric welding machine secondary side, electrode holder line) and handle (the direct contact site of operating personnel) between increase an electric shock detection control unit, this electric shock detection control unit can detect the resistance value between electric welding machine secondary side and operating personnel in real time in welding or idle operation, when resistance value presets standard value lower than certain, very short time internal cutting off electric welding machine primary side power supply (time can set), electric shock personnel are made to hightail danger, only at manual reset, and detect earth resistance when conforming with the regulations, again could open electric welding machine.This electric shock protection device for electric welding machine structure is simple, with low cost, easy to manufacture and handling safety is reliable; the safe voltage etc. can detect the resistance value between welding personnel and electric welding machine secondary side loop, the current value flowing through human body sensitive, accurately, causing to human body; when reaching trip condition; welder power can be cut off rapidly, reliably, guarantee the object of electric shock personal security.
Accompanying drawing explanation
Fig. 1 is electric shock detection control figure of the present invention;
Fig. 2 is monolithic processor control device control system figure of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 and Fig. 2 shows a kind of electric shock protection device for electric welding machine of the present invention, this device comprise monolithic processor control device 9, clock pulse control unit 13, light emitting diode control unit 10,11, earth leakage protective control unit 14, failure reset control unit 12, electric shock detection control unit.Described monolithic processor control device 9 can be ATmega16 type single-chip microcomputer (pin number is preferably 40), can also be other model single-chip microcomputer, PLC or other control systems.Wherein, 10 in described monolithic processor control device 9
#, 30
#pin is power input, and described supply voltage is all preferably 5V; 11
#, 31
#pin ground connection; Described clock pulse control unit 13, light emitting diode control unit 10,11, earth leakage protective control unit 14, failure reset control unit 12, electric shock detection control unit be all connected with described monolithic processor control device 9 circuit.Described clock pulse control unit 13 comprises crystal oscillator Y1 and electric capacity C2, C3, in described monolithic processor control device 9 12
#, 13
#the external crystal oscillator Y1 and two of pin electric capacity C2, C3 parallel connection as shown in Figure 2 circuit connects, and for providing clock pulses to monolithic processor control device 9, guarantees that monolithic processor control device 9 can normally run.Described light emitting diode control unit 10,11 comprises resistance, light emitting diode and power supply, in described monolithic processor control device 9 27
#, 28
#pin respectively by resistance R3, R4 and respective light emitting diode D3, D4 and preferably 5V power supply as shown in Figure 2 circuit be connected, realize the control to light emitting diode D3, D4, be used to refer to duty (glimmering during work) and action instruction (being lit during leakage tripping).Described earth leakage protective control unit 14 comprises auxiliary reclay J, photoelectrical coupler U2, resistance R2, preferably 5V power supply and earth leakage protective output relay; described auxiliary reclay J, photoelectrical coupler U2, resistance R2 and power supply as shown in Figure 2 circuit are connected, in described monolithic processor control device 94
#pin by photoelectrical coupler U2, resistance R2, auxiliary reclay J coil and power supply as shown in Figure 2 circuit be connected, realize the control to earth leakage protective output relay.Described failure reset control unit 12 comprises resistance R5, button switch K 1 and preferred 5V power supply, in described monolithic processor control device 9 22
#pin by R5, button K1 and VDD-to-VSS as shown in Figure 2 circuit be connected, realize failure reset input function.Described electric shock detection control unit is 40
#pin for detecting the voltage on sampling resistor, and has corresponding program to be responsible for carrying out the functions such as analog-to-digital conversion, contrast, analysis, judgement, thus realizes the real-time detection of human body resistance.Described electric shock detection control unit comprises primary power source and control loop 7 and secondary side 8 loop 4; for detecting insulaion resistance in real time; lower than when presetting standard value; it is 1-3 kilo-ohm that described insulaion resistance presets standard value; be preferably 2 kilo-ohms; cut off electric welding machine 5 power supply immediately, ensure to protect personal safety.
As shown in Figure 1, described primary power source and control loop comprise power supply, air switch DL, shutting-brake control loop and contactor M.In described primary power source and control loop, power supply preferably adopts the power voltage supplies such as 220V or 380V; by after the air switch DL of band electric leakage, overcurrent and short-circuit protection to shutting-brake control loop and contactor M, then by arriving primary side 6 loop of direct current or A.C. welder after contactor M.Wherein, described shutting-brake control loop comprises fuse FU, protective relay output node J (often opening), switch knob H (often opening), opening button F (normally closed), contactor coil M.Described shutting-brake control loop is via fuse FU; protective relay output node J (often opening), switch knob H (often opening), opening button F (normally closed) arrive contactor coil M, wherein switch knob H are parallel with contactor M self-insurance node (often opening).
After the control core formed when monolithic processor control device 9 detects and possesses combined floodgate condition, protection node J will be closed, after pressing switch knob H in the case, contactor M is by charged adhesive, contactor M self-insurance node closes, still the adhesive of contactor M can be maintained, electric welding machine 5 live line work after guaranteeing to unclamp switch knob H; When electric shock fault being detected or after reaching trip condition, controller is by disconnection protection node J, and contactor M dead electricity node disconnects, the disjunction power supply of electric welding machine 5, thus realizes trip protection function; After pressing opening button F, contactor M dead electricity node disconnects, the disjunction power supply of electric welding machine 5, thus realizes separating brake function.
As shown in Figure 1, described secondary side 8 loop 4 comprises additional dc power supply E1, commutation diode D5, D6, current-limiting resistance R6, R7, sampling resistor R8 and soldering turret 2, it is by additional dc power supply E1, by commutation diode D5, D6 respectively with respective current-limiting resistance R6, R7 as shown in Figure 1 circuit be connected, be connected with electrode holder line and earth connection circuit respectively again, the sheet metal that one end is connected to soldering turret 2 by sampling resistor R8 in addition realize and being connected of human body.
When weld job personnel human body and soldering turret line, the resistance variations between earth connection that refluxes; the ADR voltage that sampling resistor R8 detects will change thereupon; deliver to controller carry out analog-to-digital conversion and carry out the process such as contrast; reach certain when presetting standard value; the action of Control protection relay J is tripped, thus realizes creepage protection function.
This electric shock protection device for electric welding machine operation principle is:
Before welding personnel welds to welded part 3 by welding rod 1, after inspection possesses condition of work, close air switch DL, single-chip computer control system obtain electric after start working, additional dc power supply E1 obtains electric and through two diode D5, D6 and current-limiting resistance R6, R7 and sampling resistor R8, DC voltage is attached on welding personnel and soldering turret 2 (electrode holder line) or welded piece 3 (ground connection return wire), after between human body and welded part 3 or soldering turret 2, resistance value (this value of run duration Real-Time Monitoring) conforms with the regulations, auxiliary reclay J will be closed, possesses combined floodgate condition, this is after welding personnel presses switch knob H, contactor M is by charged adhesive, the auxiliary node M of contactor closes self-insurance switch knob H thereupon, at this moment welding personnel welder just can start after unclamping switch knob H to carry out weld job.In welding process due to temperature is high or operate the reason personnel such as lack of standardization touch soldering turret 2, welded 3 or resistance lower below safety value time; when protector will disconnect rapidly auxiliary reclay J; contactor M power failure tripping, thus the power supply disconnecting electric welding machine, guarantee personal safety.When welding personnel is wanted to continue welding; failure reset button K1 (or disjunction DL air switch more again power transmission) need be pressed; repetition said process is carried out insulaion resistance detection by this electric shock protection device for electric welding machine; auxiliary reclay J will be closed after satisfying the requirements, after at this moment welding personnel presses switch knob H again, can welding job be continued.
By reference to the accompanying drawings embodiments of the present invention are explained in detail above, but the present invention is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, many variations can also be made to it.
Claims (8)
1. an electric shock protection device for electric welding machine, comprises monolithic processor control device, clock pulse control unit, light emitting diode control unit, earth leakage protective control unit, failure reset control unit; Two pins in described monolithic processor control device are power input, two pin ground connection; Described clock pulse control unit, light emitting diode control unit, earth leakage protective control unit, failure reset control unit are all connected with described monolithic processor control device; Described clock pulse control unit comprises crystal oscillator and electric capacity, and the external described crystal oscillator of described monolithic processor control device two pins and two Capacitance parallel connection circuit connect; Described light emitting diode control unit comprises two resistance, two light emitting diodes and power supply, and described two resistance are connected with respective light emitting diode and power circuit respectively; Described earth leakage protective control unit comprises photoelectrical coupler, resistance, power supply and earth leakage protective output relay, and described photoelectrical coupler, resistance, power supply are connected with earth leakage protective output relay circuit; Described failure reset control unit comprises resistance, press button and power supply; described resistance, press button are connected with VDD-to-VSS circuit; it is characterized in that: also comprise electric shock detection control unit; described electric shock detection control unit comprises primary power source and control loop and secondary side circuit; and be connected with described monolithic processor control device, for detecting insulaion resistance in real time, when presetting standard value lower than insulaion resistance; cut off welder power immediately, ensure to protect personal safety.
2. electric shock protection device for electric welding machine as claimed in claim 1; it is characterized in that: described secondary side circuit comprises additional dc power supply, commutation diode, current-limiting resistance, sampling resistor and soldering turret; described secondary side circuit is by additional dc power supply; be connected with respective current-limiting resistance circuit respectively by commutation diode; be connected with electrode holder line and earth connection respectively, the other end is received on the sheet metal of soldering turret by sampling resistor again.
3. electric shock protection device for electric welding machine as claimed in claim 1 or 2; it is characterized in that: described primary power source and control loop comprise power supply, air switch, shutting-brake control loop and contactor; described power supply to shutting-brake control loop and contactor, then arrives the primary side loop of direct current or A.C. welder by air switch by contactor.
4. electric shock protection device for electric welding machine as claimed in claim 3; it is characterized in that: described shutting-brake control loop comprises fuse, protective relay output node, switch knob, opening button, contactor coil; described shutting-brake control loop is via fuse; protective relay output node, switch knob, opening button arrive contactor coil, wherein switch knob are parallel with the self-insurance node of contactor.
5. electric shock protection device for electric welding machine as claimed in claim 1 or 2, is characterized in that: it is 2 kilo-ohms that described insulaion resistance presets standard value.
6. electric shock protection device for electric welding machine as claimed in claim 3, is characterized in that: it is 2 kilo-ohms that described insulaion resistance presets standard value.
7. electric shock protection device for electric welding machine as claimed in claim 1 or 2, is characterized in that: described monolithic processor control device is single-chip microcomputer, PLC or control device.
8. electric shock protection device for electric welding machine as claimed in claim 7, is characterized in that: described single-chip microcomputer is ATmega16 type single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410376621.XA CN104096949B (en) | 2014-07-25 | 2014-07-25 | Electric shock protection device for electric welding machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410376621.XA CN104096949B (en) | 2014-07-25 | 2014-07-25 | Electric shock protection device for electric welding machine |
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| CN104096949A CN104096949A (en) | 2014-10-15 |
| CN104096949B true CN104096949B (en) | 2015-12-30 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106001854A (en) * | 2016-06-30 | 2016-10-12 | 张超 | Electric shock prevention protection device of electric welding machine |
| CN112247317B (en) * | 2020-09-16 | 2022-08-23 | 中车西安车辆有限公司 | Secondary side electric shock protection device, multi-station direct current welding machine and control method thereof |
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| KR100280193B1 (en) * | 1998-07-09 | 2001-02-01 | 이강태 | Electric shock welding device |
| JP2004105979A (en) * | 2002-09-13 | 2004-04-08 | Technocoat Co Ltd | Electric discharge type overlaying device |
| JP2013154397A (en) * | 2012-01-05 | 2013-08-15 | Daihen Corp | Welding equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2436260Y (en) * | 2000-07-24 | 2001-06-27 | 北京市京中麒电器有限责任公司 | Electric shock protector for arc welding machine with self-protection control |
| CN201399644Y (en) * | 2009-04-01 | 2010-02-10 | 刘定建 | Novel arc welding machine anti-electric shock protection device |
| TW201114537A (en) * | 2009-10-19 | 2011-05-01 | Dayok Electrical Co Ltd | Electric shock prevention circuit of an electric welder |
| CN102416519A (en) * | 2011-12-26 | 2012-04-18 | 上海广为拓浦电源有限公司 | Electric shock protection device for electric welding machine |
| CN102554411A (en) * | 2012-01-20 | 2012-07-11 | 左敬民 | Electric shock prevention device for electric welding machine |
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