JPH10277734A - Thermocouple disposition structure for soldering iron - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure a precise real time temperature at the tip end of a soldering iron and at the same time to decreased the cost. SOLUTION: From the inside to the interior of a tip end of the end part 2 of a soldering iron, an insertion hole 9 with a diameter nearly equal to a thermocouple f4 is provided, and the thermocouple 4 inserted in an insertion hole 9 is located in the interior of the tip end. Precise and real time temperature measurement is available because the interior temperature of the tip end for soldering is measurable. At the time of exchange of the end part 2, there is no need of exchanging the thermocouple 4, and it is profitable in respect of cost as well.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soldering iron, and more particularly to a structure of a soldering iron used in an automatic soldering apparatus.

[0002]

2. Description of the Related Art When soldering is continuously performed by an automatic soldering apparatus, it is important how to accurately control the temperature of the tip of the soldering iron. In particular, recently, the method of accurately controlling the temperature at the time of soldering, assuming that soldering is performed accurately as long as the temperature at the tip is within a certain range, and replacing this with product quality control In some cases, the need for accurate control of the tip temperature of the soldering iron is increasing. In order to accurately control the temperature of the tip of the soldering iron, it is necessary to grasp the accurate temperature of the tip of the soldering iron in real time. FIGS. 3 and 4 show a conventional soldering iron thermocouple arrangement for grasping the temperature of the tip.

[0003] The soldering iron of FIG. 3 has the following structure. First, a tip 2 is provided at one end of the case 1 of the soldering iron, and the tip 2 is provided inside the case 1.
Is inserted. The heater 3 includes a core member 3c made of alumina and provided with a pair of conducting holes 3b that are electrically connected to a small hole 3a provided at the tip thereof, and a heating member 3d surrounding the core member 3c. A thermocouple 4 is arranged inside the small hole 3a via a conductive hole 3b. The tip 2 includes a body 5 that increases the heat capacity of the tip 2 and suppresses a temperature change in the tip 2, and a tip 6 that is a part to be soldered. The heater 3 has a body 5
The tip 2 is inserted into a recess 7 provided in the tip 2 so that the tip 2 can be heated.

[0004] In this soldering iron, the tip 6 to be subjected to temperature measurement is separated from the thermocouple 4. That is, the thermocouple 4 located on the front end surface of the core 3c inside the heater 3 is located inside the body 5 as the heater 3 is located in the concave portion 7 inside the body 5. In this case, even if the temperature of the body 5 is regarded as the temperature of the tip 6 for the sake of convenience, the tip 6 is a part where the temperature tends to decrease when soldering is performed, while the temperature of the body 5 is small. Considering the location, it is extremely difficult to accurately measure the temperature of the tip in real time. Furthermore, since the shape of the tip of the concave portion 7 into which the heater 3 is inserted is not an accurate columnar shape but a conical shape, the thermocouple is floating from the wall surface of the concave portion 7. Therefore, according to this soldering iron structure, it is difficult to accurately measure the temperature of the body 5, and in consideration of the difference between the specific heat of copper, which is the material of the body 5, and the specific heat of air, the tip 6 can be measured in real time. Can also be said to be difficult. In this case, the thermocouple 4, which is originally insulated from the small hole 3a, is formed at the hollow portion inside the body 5, especially at the end, and the small hole 3a is formed.
There is also a disadvantage that insulation cannot be obtained due to the copper oxide entering into a.

Next, the soldering iron shown in FIG. 4 will be described. The soldering iron structure of FIG. 4 is similar to the soldering iron structure shown in FIG. 3 in that a heater 3 is provided inside the case 1.
In this soldering iron structure, the case 1 is provided integrally with the tip. However, in the soldering iron structure of FIG. 4, the inside of the heater 3 is hollow, and the thermocouple is guided so as to penetrate the inside. And heater 3
Is taken out from a small hole provided on the side surface of the tip, and is fixed to the side surface of the distal end portion 6.

According to this soldering iron structure, since the thermocouple 4 directly touches the tip, the accurate temperature of the tip 6 can always be measured. However, according to this structure, the case 1 in which the thermocouple 6 is integrally formed with the tip portion.
It is necessary to replace the thermocouple 4 each time the case 1 is replaced due to the wear of the distal end portion 6. Therefore, according to the soldering iron structure, a problem in terms of cost cannot be avoided.

[0007]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a thermoelectric device capable of measuring an accurate temperature at the tip of a soldering iron in real time, but having no cost problem. It is to provide a pair arrangement structure.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided a thermocouple arrangement structure for a soldering iron, wherein an insertion hole having substantially the same diameter as the thermocouple is formed from the inside of the soldering iron to the inside of the tip of the iron tip. The thermocouple provided and inserted into the insertion hole is located inside the distal end portion. Therefore, according to the present invention, the thermocouple is located inside the tip of the soldering iron, and the accurate temperature of the thermocouple itself can be measured. Further, according to this thermocouple arrangement structure, it is not necessary to form the thermocouple integrally with the tip, so when the tip is worn, only the tip can be replaced. Also, the problem of cost is solved.

Further, if the thermocouple in the insertion hole is brought close to the bottom surface of the insertion hole, the object for which the thermocouple measures the temperature is the wall surface inside the tip portion, so that the temperature of the tip portion can be measured more accurately and in real time. Possible and preferred. Note that the proximity here includes the state where the end face of the insertion hole is in contact with the thermocouple.

[0010]

1 and 2, an embodiment of a thermocouple arrangement structure of a soldering iron of the present invention will be described.

In the soldering iron structure of this embodiment, a tip 2 is provided at one end of a case 1 of the soldering iron, and a heater 3 is inserted inside the case 1. The inside of the heater 3 is hollow, and a thermocouple 4 is disposed so as to penetrate the hollow portion. The thermocouple 4 has a sheath structure. Therefore, since the thermocouple 4 is not grounded, the thermocouple 4 is also excellent in insulation. In addition, the tip 2
Consists of a body part 5 having a certain volume and a tip part 6 protruding from the body part 5 and is made of copper. The heater 3 is inserted into a concave portion 7 provided in the body 5 so that the tip 2 can be heated.

The heater 3 used here is a ceramic heater. The outer periphery of the ceramic heater 3 is covered with a thin plate 8 made of Inconel. This thin plate 8
Has a function to quickly transmit the heat generated by the heater to the copper tip. Accordingly, disposing the thin plate 8 on the outer periphery of the ceramic heater 3 has an effect that overheating of the ceramic heater can be prevented and burning of the ceramic heater can be prevented. Further, by disposing the thin plate 8 on the outer periphery of the ceramic heater 3, it becomes possible to prevent temperature migration (migration) peculiar to ceramic.
The entire outer peripheral surface of the ceramic heater 3 can be uniformly heated. Further, since the thin plate 8 is made of Inconel, and Inconel can be processed with much higher precision than ceramics, it is possible to enhance the adhesion between the heater 3 and the concave portion 7 provided in the body 5, There is also an effect that thermal efficiency is improved.

An insertion hole 9 is provided from the center of the bottom surface of the concave portion 7 to the inside of the distal end portion 6. The insertion hole 9 is a hole having substantially the same diameter as the outer diameter of the thermocouple 4.
Is located inside the distal end portion 6 by being inserted into the insertion hole 9. And in the case of this embodiment,
The thermocouple 4 is pressed against the end 10 of the insertion hole 9. Since the thermocouple 4 is located inside the tip 6 and the thermocouple 4 is in close contact with the inside of the tip 6, the accurate temperature of the tip can be measured in real time.
Since a mortar-shaped taper is provided on the bottom surface 11 of the concave portion 7, when assembling this soldering iron, the thermocouple 4
Is naturally guided to the insertion hole 9, thereby facilitating assembly.

[0014]

Since the present invention is configured as described above, it is possible to measure an accurate temperature at the tip of the soldering iron in real time, and it is possible to solve the problem of cost. . Furthermore, if a thin plate made of Inconel is wound around the outer peripheral surface of the heater, it has the advantage that the thermal efficiency of the heater can be increased and the failure of the heater can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a thermocouple arrangement structure of a soldering iron according to the present invention.

FIG. 2 is a sectional view showing one embodiment of a thermocouple arrangement structure of a soldering iron according to the present invention.

FIG. 3 is a perspective view showing an example of a conventional thermocouple arrangement structure of a soldering iron.

FIG. 4 is a perspective view showing an example of a conventional thermocouple arrangement structure of a soldering iron.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Tip 3 Heater 4 Thermocouple 6 Tip 8 Thin plate 9 Insertion hole

Claims (2)

[Claims] 1. An insertion hole having substantially the same diameter as a thermocouple is provided from the inside of a soldering iron to the inside of a tip of a tip, and a thermocouple inserted into the insertion hole is positioned inside the tip. Is a soldering iron thermocouple arrangement structure. 2. The thermocouple arrangement according to claim 1, wherein the thermocouple is close to a bottom surface of the insertion hole.