JP2000061631A - Thermo-mechanical machine such as soldering iron and iron - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a thermo-mechanical machine immediately after turning on a switch and to prevent overheating and a heat shortage with a simple control circuit by supplying a prescribed large power to a heater for a prescribed short time whenever the switch is operated once and switching to a small power thereafter or when the switch is not operated. SOLUTION: Although the power whose voltage is dropped with a transformer 4 is supplied to a heater 2 which is wound around the iron tip 1 as a working part of a soldering iron from a commercial power source of 100 V by continuing to push an operational switch 3, the power of high voltage H is supplied during an initial time set with a timer T, the power of low voltage L is supplied by continuing to push the switch thereafter and the power is cut when the operational switch 3 is not operated. By continuing to push the operational switch 3, the power of 15 V is supplied to the heater 2 for initial two seconds set with the timer T, the temperature of the iron tip is raised up to nearly 100 deg.C, the power is switched to 8 V after two seconds, and the iron tip is nearly kept at that temperature. When the switch 3 is repeatedly operated after three seconds and after six seconds, the temperature of the iron tip becomes nearly 300 deg.C.

Description

Detailed Description of the Invention

[0001]

[Industrial application] Soldering irons, irons, hair irons, hot melters, and other thermal processing machines in which the shape and heat capacity of the work partner change variously, especially those that can be used within a few seconds by turning on the power switch To do.

[0002]

2. Description of the Related Art A thermal processing machine such as a soldering iron is a simple one that only needs to supply a certain amount of electricity to a certain heater and that is used at the temperature of its thermal equilibrium state. So it took about 5 minutes to reach a usable temperature. In addition, some models came out faster in about 30 seconds, but they were likely to overheat, so a fairly precise control device was required.

In addition to an ordinary heater, there is a soldering iron that heats the auxiliary heater only when the switch is pressed. It is convenient to use when the other party has a large amount of heat.
If you press it for 5 seconds, you will not know how long you pressed it, so you have to weaken the heating performance to prevent overheating due to excessive pressing, and even if you use it at the start, it will be 15-20
It took almost a second.

There are some devices that can be processed quite quickly, such as a large module in which a large number of terminals of an integrated circuit, in which the shape and heat capacity of a work partner are determined, and a current of about 500 A is applied to solder them all at once, It was huge, and it couldn't be used when the shape and heat capacity of the other party were always changing.

[0005]

Therefore, the conventional soldering iron does not easily become hot even when the switch is turned on, and therefore cannot be restarted immediately after it is cooled down. There were many dangers of leaving it on, such as when it started to catch fire and burned with the hot iron tip. There was no inconvenience in working continuously for a long time, but it was not suitable for doing a small amount of work quickly or for intermittent work. Therefore, I wanted something that could be used immediately after turning on the switch, without overheating or lack of heat, and with a simple control circuit.

[0006]

[Problem to be solved by the invention] Each time the power switch is operated once, a predetermined large amount of electric power is supplied to the heater for a predetermined short time, thereby significantly increasing the temperature of the processing part, and thereafter, When the switch was not operated, a circuit was used in which the power was switched to low power and the temperature was generally maintained.

Further, as the processed portion, or when the processed portion is a metal, an electrically insulating material such as aluminum nitride having a higher thermal conductivity than the material of the heater is used as an electrical insulator, and a metal such as a nichrome alloy is used as the heater. The plate was made as thin as possible, and evenly narrowed and adhered.

[0008]

As a result, since one heat block can be generated for each switch operation, the temperature and heat quantity of the processing part can be increased stepwise depending on the number of times the switch is operated.
I decided to seek it in a short time. And by observing the number of operations and the state of the processing part, even if there is no measuring instrument or control equipment,
It could be used without overheating or running out of heat.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of the present invention as a soldering iron in a simple circuit diagram. Heater 2 wrapped around iron 1 as processing part
Then, by pressing the push button switch 3,
The transformer 4 drops the voltage from a commercial power source of 00V and energizes it. However, it keeps flowing at the voltage of H during the first set time of the timer T and at the voltage of L after that, and the electricity is cut off when the push button switch 3 is released. .

As seen from the perspective view of the iron tip 1 with the cover removed as shown in FIG. 2, the tip of the iron tip 1 is sharpened with copper.
A mm square rod is wrapped with an aluminum nitride thin plate 5 having a thickness of 0.6 mm, and further, a thickness of 0.1 mm and a width of 2 mm.
The thin band-shaped nichrome or iron-chromium ribbon wound up and down while reciprocating in the length direction is used as the heater 2. In practice, this is further wrapped with an insulator and a heat insulating material so as to be adhered and fixed. The heat conductivity of the aluminum nitride 5 is many times higher than that of iron chromium, so that the heat generated by the heater 2 can be quickly transmitted to the copper tip 1.

Assuming that this soldering iron is used, a graph in which the vertical axis of FIG. 3 shows temperature and the horizontal axis shows time while inputting the approximate values, the switch T3 is kept pressed and the timer T 1.5 Ω for 2 seconds set
15V is supplied to the heater 2 of the transformer from the winding H of the transformer, the iron tip rises by about 100 degrees, and after 2 seconds, the low voltage L
It is switched to 8V, and the temperature is maintained almost. In this example, the electric power is 150 W at the beginning and about 40 W after.

This switch operation is repeated after 3 seconds and 6 seconds. The pressing time is considered to be 1 second, but it takes 30 seconds or more to lower the temperature by 100 degrees even if the heater of this degree does nothing, so the temperature reduction within that time can be ignored. It starts at room temperature of 20 degrees and reaches around 300 degrees 8 seconds after the third switch operation. When I started working there, the temperature dropped, and after 6 seconds, it reached nearly 200 degrees. Then, if you release the switch, it slowly goes to room temperature as shown by the dotted line, but since it resumes work, it will rise to 300 degrees again as shown by the solid line when the switch is turned on the fourth time.

These values and graphs vary depending on the heat capacity of the heater and the iron tip and the work partner, the set electric power and time, and the higher the temperature of the iron tip, the more nearly vertical temperature rise of rapid heating becomes. The graph of the second unit generally shows such a figure, although it shows an upward or downward slope until it reaches the equilibrium temperature of air cooling. Also, in this example, it can be considered that three heat blocks were obtained by operating the heat block of 100 degrees for one switch operation three times, but if the heat block is made smaller, four blocks of 70 degrees, 50
It can be set to 6 per degree, and the heat supply will be smooth,
It takes a long time and the number of times the switch is pressed until the desired temperature is reached.

On the contrary, the heat block can be set to 200 degrees in 2 seconds, and the operation can be started after 2 seconds by one operation. However, even if the heat becomes insufficient, pushing it once more to raise it up to 200 degrees may have a bad effect depending on the electronic components of the other party. In this case
Capacitor 6 that determines the time, like the timer circuit in
If it takes a long time to restore, the next rapid heating time becomes from 2 seconds to 0.5 seconds, for example, and the heat block becomes 50 degrees, and becomes small and smooth unless the interval from the previous energization is long.

In this circuit, the electric charge stored in the capacitor 6 via the resistor 7 is switched to the resistor 8 when the switch is turned off.
Is discharged for 5 to 15 seconds, for example. Therefore, the shorter the time after being turned off, the more the residual charge is. For example, when the switch is turned off and on again for only 1 second, the time until the time is up is about 0.5 seconds, and if it is turned off for 2 seconds, it is about 1 second. As described above, the time at the time of the next energization is shortened, and the heating time for rapid heating is shortened, so that the temperature rise is reduced.

This overheat prevention means can be done only by setting the circuit, but it can also be done by a thermostat or a sensor, and it could not be used because it exceeded the sensing speed of the sensor etc. in rapid heating, but it crawled gently. Since it is easy to detect the temperature during heating or cooling, the rapid heating will drop to 50 degrees if it exceeds 300 degrees, or the rapid heating will not be possible if it exceeds 400 degrees. May be incorporated. In any case, if the temperature of the processing part is at or near the temperature suitable for processing, it is sufficient to compensate for the lack of heat, so if the certain conditions are satisfied, the temperature rise of rapid heating should be zero. The circuit should be narrow. Of course, it may be combined with normal temperature control.

Further, in the circuit of FIG. 1, the switch 3 also serves as a power switch, and when the switch 3 is released, all the power is turned off, which is convenient and safe. However, as shown in FIG. 5, the power switch 9 is provided separately so that the auxiliary heater 10 can be used to perform rapid heating for a short time set by the timer T only when the operation switch 3 is pressed separately from normal heating. You can also make a circuit. Also, the heating may be changed in three steps in combination with FIG. These are also variations of the present invention, and the point is that a heat block of a predetermined size should be generated each time the switch is operated, that is, a command is sent to the circuit.

Therefore, until now, rapid heating and horizontal heating were switched by a simple timer, so the temperature rise was completely stepwise, but the temperature graph shows that even rapid heating draws an arc. It is good. Since it keeps giving heat to the work partner even when it is flattened, it is often convenient for the temperature rise to increase a little, and such variations are also within the scope of the present invention.

Further, the rising temperature and time of the rapid heating and the strength of the horizontal heating may be adjustable depending on the heat capacity and properties of the work partner. In that case, the power control can be performed not only by the transformer but also by electronic control, particularly phase control by a thyristor and on / off control by a zero-cross switch, which is smaller and easier to incorporate in the machine body. Also, a combination thereof may be used, and the power source may be not only a commercial power source but also a battery or the like.

In the present invention, since speed is an object,
The thermal response of the heater and the work area should be fast. For that purpose, a good thermal conductor such as aluminum nitride, which has an extremely good thermal conductivity, can be used as it is in a plastic processing machine or the like, or it can be poorly wetted as in the case of the iron tip in Fig. 2 and can be made of copper or the like. If so, it is preferable to use it as the electrical insulator. If economically suitable, silicon carbide or the like may be used.

The heater may be a method of baking a metal compound on the surface thereof, but when a metal heater such as an iron-chromium ribbon is used, a current can be made to flow normally as compared with an oxide heater or the like, but if it is adhered, the The generated heat is absorbed by the aluminum nitride, and a large current of more than twice can be passed, so that the followability during rapid heating is good, and the economy and life are good.

In order for the heat generated by the iron-chromium ribbon to be efficiently absorbed by the aluminum nitride, the thinner the thickness, the better. The shape of the rolled thin plate will collapse even if it is about 0.2 mm, but if you temper it properly by hardening it,
A thickness of 0.1 mm and a width of 0.3 mm could be used. Other methods may be used, but it is possible to make the shape as a heater by etching or wire cutting as thin as possible so long as the shape can be maintained.

Since the heat generated by the iron-chromium ribbon immediately reaches the entire processed portion through the closely adhered aluminum nitride, the iron-chrome ribbon does not become red hot like the nichrome wire in the mica of the conventional soldering iron, and the quenching applied is returned. Nothing. Therefore, it is easy to insulate it, and the heater itself lasts a long time.

The beam, corners, etc. of the free-working portion, which are hard to make close contact with each other, do not absorb heat and are insulated by air, and the temperature becomes extremely high or burns out if it gets worse. It is necessary to widen the width by making it 2 to 3 times as large as that of the heater portion so as to reduce the heat generation itself so as not to overheat, as in the corner 11 of FIG.

From these, as shown in FIG. 6, the heater of the iron tip of FIG. 2 is formed by inserting a large number of thin slits perpendicular to the length direction on the ribbon of the iron-chromium alloy or the like alternately in the left and right to form a thinner line zigzag. It could be made into a new shape. Thus, if the resistance of the heater was set to 17Ω, it could be directly connected by half-wave rectifying 100V, and the current was reduced to 3A, and the transformer could be omitted. The zigzag is as shown in the figure.
It is easier to absorb the expansion and contraction due to the heat generation of the heater wire when it is folded back at a short distance, and it becomes stronger against deformation such as bending.

Although the solder iron trowel has been described above by way of example, other clothing irons, hair irons, hot melters, plastic heat processing machines and the like have different shapes and operating temperatures, but they are practical. The same can be said of. In addition, since the text considers temperature as a sensory index of the amount of heat, it may not be accurate as a description of temperature, but it should agree as a general tendency.

[0027]

EFFECTS OF THE INVENTION Since the rise of heat can be done quickly within a few seconds when the sensor cannot catch up, the equipment can be used immediately and the time is not wasted.

Since no electricity is left on, there is no need to worry about burns or fires at the working portion such as the iron tip. Moreover, since there is no overheating, there is no waste of energy, and the life of the heater and the processing parts such as the iron tip is extended.

Since it is not heated at all times, it is small in size for its heat capacity, and it is short and easy to use in the example of the soldering iron. It also has a suction device for solder, a supply device, a fixture, etc. A service device can be easily added, making it more convenient.

Since it is not necessary to use a precise sensor or an expensive control device, and a relatively simple circuit is sufficient, it can be manufactured inexpensively for its performance.

In particular, if the heater is zigzag and is made thin and long, the transformer is not necessary when the power supply voltage is around 100 V, so that the apparatus can be further simplified.

[Brief description of drawings]

FIG. 1 is a wiring diagram of an example of the present invention.

FIG. 2 is a perspective view showing a soldering iron tip cover.

[Fig. 3] Heating graph of the processing part

FIG. 4 is a circuit diagram of timer T

FIG. 5 is another circuit diagram of an example of the present invention.

6 is a plan view of a heater having a zigzag shape of the iron tip of FIG. 2;

[Explanation of symbols]

1 iron tip 2 heater 3 operation switch 4 transformer 5
Aluminum nitride 6 condenser 7, 8 resistance 9 power switch 10 auxiliary heater 11 heater corner T timer

Claims (4)

[Claims] 1. A processing unit including at least one or a plurality of heaters, a power supply circuit connected to the heater to supply and control electric power, and a switch for operating the circuit. The power supply circuit operates the switch once. Each time, a large amount of heat and temperature of the processing part is substantially increased within a predetermined range by supplying a large amount of electric power to the heater for a short time of about 1 second to several seconds, and then or after that switch. When not operating, switch to low power or zero to slowly move to the equilibrium temperature, and by operating the switch an appropriate number of times,
A thermal processing machine for soldering irons, irons, etc. characterized by increasing the temperature in a stepwise manner to obtain the required temperature and the required amount of heat. 2. When the temperature of the machining portion of the power supply circuit reaches a certain temperature or when the switch operation before that satisfies a certain condition, the stepwise temperature rise due to the subsequent switch operation is zero. The thermal processing machine according to claim 1, further comprising an overheat prevention circuit having a narrow width. 3. A heat-conductive conductor having a higher thermal conductivity than the material of the heater, such as aluminum nitride, is used as the processed portion or as an electrical insulator when the processed portion is a metal, and a metal such as an iron-chromium alloy is used. A heat processing machine characterized in that the plate is made as thin as possible so that the shape can be maintained by applying appropriate quenching to strengthen the waist, and then the shape of the heater is brought into close contact. 4. The heater of the processing part has a zigzag shape in which a large number of thin slits are alternately inserted from the left and right in a thin plate of iron-chromium alloy or the like, and the thin line is folded back at a desirably shorter distance. The thermal processing machine according to claim 3, wherein: