CN2406764Y - Constant temp. fast electric iron - Google Patents

Abstract

The utility model relates to a constant temperature fast electric soldering iron, which is a hand welding tool. The utility model utilizes the mechanism that working voltage can be changed following the resistance variation of a working head caused by temperature variation when welding. The voltage variable is used as the temperature control signal which is treated by a circuit and then controls the length of the conduction time of a controllable silicon to achieve the purpose of temperature control of the soldering iron. Because of the adoption of the method, the soldering iron becomes a novel energy saving welding tool which has the advantages of no preheating, strong versatility, self-adjusting of the power strength following the size of a welding spot, constant temperature, instant strong heating function, light weight, small size, long service life and convenient operation. The novel energy saving welding tool can weld various electronic components when charged.

Description

The constant temperature speedy heating iron

The utility model relates to welding field, is a kind of soldering speedy heating iron, also particularly a kind of operating temperature is constant, at any time adjustable, need not preheating and have moment force hot merit can the constant temperature speedy heating iron.

Along with the develop rapidly of electronics, power industry, soldering appliance has become one of human necessary tool, although created flatiron miscellaneous since the human use electric energy, result of use is desirable not to the utmost, and its basic problem is as follows:

The tradition speedy heating iron is because during its work, the too fast serviceability temperature of temperature rise is extremely non-constant, therefore is difficult to operation, so be the instrument of not only liking but also be afraid of usefulness in numerous user's hands since speedy heating iron comes out always.

The traditional electrical flatiron all needs long-time preheating, even preheating time, the shortest speedy heating iron also needed more than 4 seconds, therefore general operation person is for limited use several times, and have to allow flatiron energising work for a long time be waited for, therefore electric iron become that famous energy consumption is big, utilization rate is low, rapid wear, accident-proneness, make us one of instrument of having no way out again.

Electric iron requires the heating temp constant, for realizing the constant temperature purpose, people have created a lot of temperature automatically controlled methods, but owing to placing restrictions on of electric iron condition of work, as temperature automatically controlled essential temperature sensor, also can't be directly installed at present on the sensitive part operating point, this just makes the working head variations in temperature of those temperature automatically controlled flatirons and sensor senses variations in temperature that arranged one period long lag time, so all there was the not good enough defect of practical effect in those temperature control flatirons of development in the past.

Temperature is high during welding, and welding quality is good, speed is fast, still fragile element, wiring board, flatiron, and operating difficulties, temperature is low during welding, welding difficulty, easily dry joint, speed is also slow, but element, wiring board are not fragile, and the flatiron life-span is long, and be easier during operation yet, both are difficult to take into account, and this is one of insurmountable difficult problem of traditional electrical flatiron.

Along with the extensive application of surface mount elements, because the surface mount elements thermal shock resistance is poor, general flatiron is difficult to handle.

Because reasons in structure is even general electric iron has its reliability of earthing or grounding means also open to suspicion, so safe soldering CMOS class circuit has become the difficult point of general electric iron work.

The utility model aim to provide a kind of operating temperature constant, at any time adjustable and have moment force the hot merit energy, need not preheating, highly versatile, in light weight, volume is little, the life-span is long, easy to use, constant temperature speedy heating iron that can all kinds of electronic devices and components of long-term safety soldering.

The utility model is achieved in that in the pistol type insulation crust has installed working head; main transformer; power line and element are installed wiring board; element is installed on the wiring board and is equipped with: power switch; decompression capacitor; voltage-stabiliser tube; the halfwave rectifier diode; the power filter electrochemical capacitor; luminous tube; controllable silicon; time base circuit " 555 "; force thermal switch; temperature-adjusting potentiometer; transformer; signal voltage bridge rectifier and signal voltage filtering and time-delay electrochemical capacitor; working head is secondary with main transformer and transformer low pressure winding is in parallel in these elements; the secondary mid point protective grounding that links; main transformer elementary be parallel to the wiring board power end after controllable silicon is connected; power supply one end ground connection one termination power switch; the SCR control utmost point connects " 555 " output 3 pin by luminous tube; secondary output place of transformer low pressure side joint main transformer; temperature-adjusting potentiometer one termination " 555 " 4 and 8 pin other end ground connection; swing arm connects " 555 " 5 pin in the middle of it, and all the other are installed on the wiring board at element and electrically connect as required.When close in the power switch end, the no electricity of time base circuit " 555 " is not worked, and controllable silicon ends, and main transformer does not have electricity, and working head does not have.When the operator uses, press power switch, power supply is by the decompression capacitor step-down, the voltage-stabiliser tube voltage stabilizing, the halfwave rectifier diode rectification, provide suitable operating voltage for time base circuit " 555 " after the filtering of power filter electrochemical capacitor, time base circuit " 555 " work, work when just having begun since signal voltage filtering and time-delay do not have with electrochemical capacitor, 2 and the 6 pin place electronegative potentials that time base circuit " 555 " is in parallel, 3 pin output high level, this level is sent into the SCR control end by luminous tube, the controllable silicon conducting, main transformer gets electric, and working head heats up, transformer so output AC signal voltage, this voltage is through the rectification of signal voltage bridge rectifier, the electrolysis capacitor filtering is used in signal voltage filtering and time-delay, delivers to time base circuit " 555 " 2 and 6 pin in parallel.Increase along with heat time heating time, the working head temperature rises, it is big that its resistance becomes, the working head electric current is along with minimizing, therefore corresponding rising of main transformer output voltage with dropping characteristic, the transformer output signal rises, when 555 " when 2 and 6 in parallel pin voltages rise to the resetting voltage of being set by the temperature control potentiometer; time base circuit " 555 " resets; 3 pin output LOW voltages, and controllable silicon ends, the main transformer dead electricity; working head stops heating; the output of transformer no signal, after time base circuit " 555 " is kept the electronegative potential output of time base circuit " 555 " a period of time by signal voltage filtering and time-delay with the remaining voltage of electrochemical capacitor, when signal voltage filtering and time-delay are reduced to 2 pin triggering levels gradually with the voltage on the electrochemical capacitor; circuit repeats said process, and the constant temperature speedy heating iron begins a new round and heats.Temperature control and temperature adjustment purpose have been realized thus, above-mentioned signal acquiring method, no hysteresis.

In the course of the work, need force heat as the operator, press and force thermal switch, short circuit the transformer output signal, force 2 and 6 in parallel pin of time base circuit " 555 " to be in electronegative potential, make time base circuit " 555 " export high potential for a long time, the full conducting of controllable silicon, circuit is controlled by temperature signal no longer, and the working head full power operation has reached and forced hot purpose.

" constant temperature speedy heating iron " has the constant temperature function, so can design preheating time very shortly, about about 0.5 second, because of operating personnel from press switch to begin the welding, generally need 1～2 second time (such as seeking solder joint, preparing material etc.), and 0.5 second within time, so claim the without preheating time, thereby " constant temperature speedy heating iron " solved long-term puzzlement Welder author's a flatiron preheating difficult problem.

" constant temperature speedy heating iron " can moment force heat, when making the soldering in long-term puzzlement soldering field temperature high with hang down between contradiction solved.The operator begins welding with low temperature, click fast afterwards and force thermal switch (about about 0.5 second), solder joint moment rising temperature, take advantage of heat also to import components and parts in the end, before wiring board glue-line end goes to pot, force the thermojunction bundle, operation can greatly improve welding quality and speed like this, harmless again components and parts and wiring board.

" constant temperature speedy heating iron " has forcing heat and can regulating the function of temperature fast, arbitrarily of can operating at any time, thereby it can be easily with the low-temperature prewarming surface mount elements, after the preheating fully, heat up (forcing heat) to molten tin temperature again, thereby reaches the purpose of convenient, harmless dismounting surface mount elements.

" constant temperature speedy heating iron " has reliable grounding construction, except the operating voltage of peak value below 1V, can not produce other on the working head more unusually in earthy any interference pulse voltage on the working head.Therefore this flatiron has ability safe, continuous electric soldering all kinds component.

Its working head material of the utility model is big by temperature-coefficient of electrical resistance, is difficult for material oxidized and that the scolding tin wellability is good and makes.Be general purpose and the operation of suitable surface mount elements, the working head diameter is selected Φ 0.8-Φ 1.5mm plurality of specifications for use.

The utility model main transformer, its secondary being cut by two abnormal shape side's copper pipes is sawn into coiled type and is in series, and this structure has greatly dwindled volume, the weight of complete machine and has improved performance, for succeeding in developing of constant temperature speedy heating iron provides essential basis.

After adopting such scheme, the utility model realized operating temperature constant, at any time adjustable and have moment force the hot merit energy, need not preheating, highly versatile, in light weight, volume is little, the life-span is long, the constant temperature speedy heating iron of easy to use, all kinds of electronic devices and components of energy long-term safety soldering.

Below in conjunction with drawings and Examples the utility model is further specified:

Figure one is the utility model electrical schematic diagram.

Figure two is the utility model electricity theory diagrams.

Figure three is vertical profile apparent structure figure of constant temperature speedy heating iron embodiment.

Among the figure: shell (1), working head protective cover (2), main transformer (3), working head (4), power switch (5), time base circuit " 555 " (6), force thermal switch (7), transformer (8), temperature-adjusting potentiometer (9), power line (10), luminous tube (11), element is installed wiring board (12), power supply decompression capacitor (13), halfwave rectifier diode (14), voltage-stabiliser tube (15), power filtering capacitor (16), signal bridge rectifier (17), signal filtering and delay capacitor (18), controllable silicon (19).

In the drawings: working head (4) has been installed in pistol type insulation crust (1), main transformer (3), power line (10) and element are installed wiring board (12), element is installed on the wiring board and is equipped with: power switch (5), decompression capacitor (13), voltage-stabiliser tube (15), halfwave rectifier diode (14), power filter electrochemical capacitor (16), luminous tube (11), controllable silicon (19), time base circuit " 555 " (6), force thermal switch (7), temperature-adjusting potentiometer (9), transformer (8), signal voltage bridge rectifier (17) and signal voltage filtering and time-delay electrochemical capacitor (18), working head is secondary with main transformer and transformer low pressure winding is in parallel in these elements, main transformer elementary be parallel to the wiring board power end after controllable silicon is connected, power supply one end ground connection one termination power switch, the SCR control utmost point connects " 555 " output 3 pin by luminous tube, secondary output place of transformer low pressure side joint main transformer, temperature-adjusting potentiometer one termination " 555 " 4 and 8 pin other end ground connection, swing arm connects " 555 " 5 pin in the middle of it, and all the other are installed on the wiring board at element and electrically connect as required.

In figure three embodiment:

(1) preparation work head at first is with the working head welding forming, through becoming working head after shaping, the surface treatment.

(2) main transformer assembling: after milling becomes tubular coil on request with square specially shaped copper tube, add insulation, and coiling primary coil in the above, get two identical coils that wound again, insert C shape silicon steel sheet in the middle of adding the insulation back, connect the primary and secondary tail end, handle through dipping lacquer and oven dry, main transformer is made.

(3) coiling signal voltage transformer routinely, and dipping lacquer is handled.

(4) with diode, voltage-stabiliser tube, electric capacity, resistance, microswitch, touch-switch, integrated circuit, triode, electric wire, luminous tube, the potentiometer of buying, wiring board is assembled on streamline becomes control circuit integral body.

(5) the control circuit integral body that working head, main transformer, the assembling that completes finished is installed among the shell together, electrically connects, and refills button and working head protective cover, and is qualified after tested, and the quick flatiron of constant temperature is made and finished.

Claims (4)

1; a kind of constant temperature speedy heating iron; in the pistol type insulation crust, working head has been installed; main transformer; power line and element are installed wiring board; it is characterized in that: element is installed on the wiring board power switch is installed; decompression capacitor; voltage-stabiliser tube; the halfwave rectifier diode; the power filter electrochemical capacitor; luminous tube; controllable silicon; time base circuit " 555 "; force thermal switch; temperature-adjusting potentiometer; transformer; signal voltage bridge rectifier and signal voltage filtering and time-delay electrochemical capacitor; working head is secondary with main transformer and transformer low pressure winding is in parallel in these elements; the secondary mid point protective grounding that links; main transformer elementary be parallel to element after controllable silicon is connected the wiring board power end be installed; power supply one end ground connection one termination power switch; the SCR control utmost point connects " 555 " output 3 pin by luminous tube; secondary output place of transformer low pressure side joint main transformer; temperature-adjusting potentiometer one termination " 555 " 4 and 8 pin; other end ground connection; swing arm connects " 555 " 5 pin in the middle of it, and all the other electrically connect on printed panel as required.

2, constant temperature speedy heating iron as claimed in claim 1; it is characterized in that secondary being cut by two abnormity side's copper pipes of main transformer is sawn into coiled type; then tail and tail link and link the place as the protective grounding leading point, all the other two statures are in parallel with working head and signal voltage transformer.

3, constant temperature speedy heating iron as claimed in claim 1 is characterized in that also being provided with and forces thermal control circuit, is used for flatiron moment to force heat.

4, constant temperature speedy heating iron as claimed in claim 1 is characterized in that flatiron working head and material that be difficult for oxidation big by temperature-coefficient of electrical resistance make.

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