JP2012121043A - Soldering iron - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a temperature sensor in an easily handleable shape to be simply and surely mountable to a soldering iron in a stable attitude, and to allow its contact to an iron tip to be surely performed.SOLUTION: This soldering iron includes: an iron tip 1; a heater case 2 arranged to surround the outer periphery of a body part 1b of the iron tip 1 and including an electric heater 5 in the inside; an iron case 3 arranged to surround the outer periphery of the heater case 2 for fixing the iron tip 1 to the heater case 2; and a temperature sensor 4 formed into a shape of a rod-like sensor having a temperature detection part 4 at the front end by storing a temperature detection element 16 and lead wires 17 in an elongated tubular sensor case 15; wherein the temperature sensor 4 is displaceably inserted in the heater case 2 and energized toward the front end side by a sensor spring 30, and the temperature detection part 4a is fitted in a sensor insertion hole 10 of the iron tip 1 and elastically contacts the iron tip 1.

Description

  The present invention relates to a soldering iron used for soldering various electronic components such as semiconductor chips.

  When soldering various electronic parts such as semiconductor chips automatically or manually, a soldering iron having an electric heating heater is generally used. This soldering iron usually includes a copper soldering tip composed of a heat transfer body and a soldering tip, and the heater for heating the soldering tip, and is heated by the heater. Further, it is configured such that the linear solder is melted and soldered at the tip portion of the tip.

  In order to efficiently perform high-quality soldering using the soldering iron, it is necessary to monitor the temperature of the tip portion and keep it constant. For this reason, conventionally, for example, as disclosed in Patent Document 1, the temperature of the tip portion is detected by a temperature sensor (temperature detection element), and the heater is turned on / off according to the difference between the detected temperature and the set temperature. By turning it off, the tip temperature is kept constant.

  However, in the conventional example, since the temperature detection element such as a thermistor is directly accommodated in the sensor mounting hole in the heel chip, the mounting state of the temperature detection element is unstable, and the heel chip is positioned for positioning. When rotated or when the soldering iron is displaced at high speed during automatic soldering, the contact with the soldering tip is likely to deteriorate or be displaced, and the lead wire from the temperature detecting element can be removed. Since the lead was pulled out from the sensor mounting hole through the internal space of the soldering iron, the lead wire was bent or twisted, so that there was a problem that the lead wire was poorly fit and easily affected by heat from the heater.

Japanese Patent Application Laid-Open No. 55-112165

  An object of the present invention is to form a temperature sensor in an easy-to-handle form so that it can be easily and reliably attached to a soldering iron in a stable posture, and is configured so that contact with the soldering chip is also performed reliably. is there.

In order to achieve the above object, a soldering iron of the present invention is composed of a body part for heat transfer and a tip part for soldering, and a soldering chip provided with a sensor insertion hole extending in the axial direction inside, A cylindrical shape having an electric heater for heating the saddle tip, a mounting portion having a male screw cut in a part of the outer periphery, and disposed so as to surround the outer periphery of the trunk portion of the saddle tip A heater case and a heater ring disposed so as to surround the outer periphery of the heater case and locked to the flange chip, and having a rotatable screw ring at a rear end portion, and screwing the screw ring to the mounting portion. A cylindrical scissors case for fixing the scissors chip to the heater case, and a temperature detection element and a lead wire are housed inside a sensor case having an elongated cylindrical shape, and the temperature detection element is disposed at the front end of the sensor case. By placing before Is formed in the shape of a rod-shaped sensor having a temperature detection portion, and is inserted into the heater case so as to be displaceable along the axis of the heater case, and is biased toward the front end side by a sensor spring, A temperature sensor in which the temperature detection unit is fitted into the sensor insertion hole of the heel chip and elastically contacts the heel chip; and
It is characterized by having.

  Preferably, in the present invention, a rear end portion of the sensor case in the temperature sensor is movably supported by a sensor guide formed in the heater case, and a spring seat is fixed to the sensor case. The sensor spring is interposed between the sensor guide and the sensor guide.

In the present invention, an annular contact portion with which the rear end portion of the saddle chip contacts is formed inside the heater case, and one and the other of the rear end portion of the saddle tip and the corresponding contact portion, Are formed with a recess and a protrusion for positioning the reed tip in the rotational direction, and the recess and the protrusion are fitted to each other at one angle when the reed chip is rotated 360 degrees around the axis. It is desirable that they are arranged so as to match.
More preferably, the two protrusions and the two recesses are disposed at positions asymmetric with respect to the axis of the heater case and the saddle chip.

  Further, in the present invention, the screw ring of the saddle case occupies a position away from the mounting portion of the heater cap when the projection is not fitted in the recess, and when the projection is fitted in the recess, It is desirable that it can be screwed.

  According to the present invention, the temperature sensor is formed in the shape of a rod-shaped sensor having a temperature detection portion at the front end, and is urged by the sensor spring and disposed inside the heater case. The temperature sensor is not only very easy to handle in shape but also attaches to the solder iron in a simple, reliable and stable posture because it is made to elastically contact with the iron tip in the sensor insertion hole. In addition, it is possible to obtain an excellent effect that the contact with the heel chip is also reliable.

It is a perspective view of a soldering iron concerning the present invention. It is a longitudinal cross-sectional view of FIG. FIG. 2 is an exploded view of FIG. 1 in which a bag case is omitted. It is a perspective view of a heater case. It is an expanded sectional view which omitted a part of temperature sensor.

  FIG. 1 shows an embodiment of a soldering iron according to the present invention. This soldering iron is of a type used by being attached to a work arm of an automatic soldering apparatus (soldering robot).

  As can be seen from FIG. 1 to FIG. 3, the soldering iron includes a soldering chip 1 that melts linear solder for soldering, and a cylindrical heater case 2 that heats the soldering chip 1 with a built-in electric heater 5. A cylindrical scissor case 3 for fixing the scissor tip 1 to the heater case 2, and a slender bar-shaped temperature sensor 4 for detecting the temperature of the scissors tip 1a of the scissor tip 1, and these scissors The chip 1, the heater case 2, the eaves case 3, and the temperature sensor 4 are arranged substantially concentrically around the axis L of the solder rod.

  The saddle tip 1 is formed by integrally forming a cylindrical body portion 1b for heat transfer and a tapered tip portion 1a for soldering with copper having excellent thermal conductivity. The outer surface is coated with an iron plating layer (not shown) serving as a protective film, and the front end portion of the heel portion 1a is a solder wetting surface 1c. A locking step portion 8 having a different diameter is formed on a part of the outer periphery of the heel tip 1, and a locking portion 9 at the front end of the heel case 3 is engaged with the locking step portion 8 from the heel end portion 1a side. It has stopped.

  In addition, a circular sensor insertion hole 10 extending in the axial direction of the collar chip 1 is formed inside the collar chip 1, and the temperature sensor 4 is inserted into the sensor insertion hole 10 so as to be freely inserted and removed. Yes. The sensor insertion hole 10 includes a large-diameter hole portion 10a extending from the rear end portion of the body portion 1b toward the tip portion 1a, and a flange portion extending from the front end of the large-diameter hole portion 10a. A small-diameter hole portion 10b extending inside the tip portion 1a toward the front end of the tip portion 1a, and the front end of the small-diameter hole portion 10b does not penetrate to the front end of the tip portion 1a. It ends near the center in the direction of the axis L inside the portion 1a. The inner diameter of the small diameter hole 10 b is slightly larger than the outer diameter of the temperature sensor 4.

  A cylindrical metal cap 11 is fitted and fixed to the rear end portion of the saddle tip 1 so as to protrude rearward from the saddle tip 1, and the heater case is attached to the rear end portion of the cap 11. Indentations 12 that form a positioning mechanism in cooperation with the protrusions 13 formed inside 2 are formed in the radial direction. By this positioning mechanism, positioning in the rotational direction when fixing the heel chip 1 to the heater case 2 is performed. Is to be done. The recesses 12 are formed at two locations in the circumferential direction of the cap 11, and their positions are asymmetrical positions with respect to the center of the heel tip 1. In the illustrated example, the two depressions 12 are arranged at a central angle of 90 degrees, but may be other than 90 degrees as long as the central angle is other than 180 degrees.

  As can be seen from FIG. 5, the temperature sensor 4 accommodates the temperature detection element 16 and the lead wire 17 in an electrically insulated state in a metal sensor case 15 having an elongated and straight tube shape. By disposing the detection element 16 at the front end of the sensor case 15, the detection element 16 is formed in the shape of a rod-shaped sensor having the temperature detection unit 4a at the front end. The lead wire 17 is led out from the rear end portion of the sensor case 15 and can be connected to a control device. As the temperature detection element 16, for example, a thermocouple can be used.

1 to 4, the heater case 2 is made of a metal material having excellent heat resistance and thermal conductivity such as stainless steel, and has a large-diameter outer cylinder 20 and a concentric inner part of the outer cylinder 20. The outer cylinder 20 and the small-diameter inner cylinder 21 integrated at the tip are formed to have a double cylindrical structure, and the inner circumference of the outer cylinder 20 and the outer circumference of the inner cylinder 21 are formed. The electric heater 5 is built in an annular heater chamber 22 formed between the lead wire 23 and the lead wire 23 from the electric heater 5 is led out of the heater case 2 and connected to a power supply device at the end of the wire. (Not shown) is attached.
The electric heater 5 can be configured, for example, by disposing a nichrome wire in the heater chamber 22 so as to surround the outer periphery of the inner cylinder 21 in an electrically insulated state.

  The heater case 2 concentrically surrounds the outer periphery of the body portion 1b of the saddle chip 1 and supplies heat from the electric heater 5 to the body portion 1b from the outer peripheral surface side. A heel portion 1a of the heel tip 1 extends from the front end. An annular contact portion 25 with which the rear end portion of the saddle chip 1, that is, the rear end portion of the cap 11 abuts, is formed at the inner intermediate position of the heater case 2. The protrusion 13 extending in the radial direction of the corresponding contact portion 25 is formed on the surface on the contact side. The protrusions 13 are formed at two locations, and the positions thereof are asymmetrical positions with respect to the center of the heater case 2 and are positions corresponding to the recesses 12 of the saddle chip 1. In the example shown in the figure, the two protrusions 13 are arranged via a central angle of 90 degrees. Then, the protrusion 13 is fitted in the recess 12 so that the reed tip 1 is positioned in the rotational direction.

  By forming the projection 13 and the depression 12 in such an arrangement, when the heel tip 1 is rotated 360 degrees around the axis L from a certain position, the projection 13 and the depression 12 are within the range. Since there is only one angle (position) for fitting each other, the heel tip 1 can always be fixed at one position (orientation) in the rotational direction. As a result, even when, for example, the solder wet surface 1c at the heel portion 1a is provided with directionality, there is no risk of fixing the heel tip 1 with the wrong orientation of the wet surface 1c, and the heel tip 1 is always correct. It becomes possible to fix the orientation.

  On the outer periphery of the heater case 2, a mounting portion 26 having a male screw 26 a on the outer periphery is formed at a position near the rear end of the heater case 2, and at the rear end of the heater case 2 A hook-shaped arm mounting portion 27 is formed so as to project in a direction perpendicular to the axis of the heater case 2, and the arm mounting portion 27 can attach the solder rod to the work arm of the soldering robot.

The temperature sensor 4 is inserted into the central portion of the heater case 2 so as to be displaceable along the axis of the heater case 2, that is, the axis L of the soldering iron. A rear end portion of the sensor case 15 in the temperature sensor 4 is movably supported by the sensor guide 28 by passing through a support hole 28a of the sensor guide 28 formed in the heater case 2, and the sensor guide A coil-shaped sensor spring 30 is interposed between the sensor guide 28 and a spring seat 29 that partially protrudes outward from the sensor case 15 and is fixed to the outer periphery of the sensor case 15. Is biased toward the front end side, that is, toward the heel tip 1 side. Further, a stopper 31 is fixed to a portion protruding from the sensor guide 28 at the rear end portion of the temperature sensor 4, and the stopper 31 abuts on the outer surface of the sensor guide 28, so that the temperature sensor 4 moves forward. Is prevented from coming out.
And the temperature detection part 4a of the front end of this temperature sensor 4 fits in the small diameter hole part 10b of the sensor insertion hole 10 of the said collar chip 1, and the said sensor spring is attached to the said collar chip 1 in the front end part of this small diameter hole part 10b. It is pressed elastically with 30 urging forces.

  The heel case 3 is made of a heat-resistant metal material such as stainless steel, and the engagement portion 9 that engages the engagement step portion 8 of the heel chip 1 at the front end by reducing the diameter of the front end. A screw ring 32 having a female screw 32a on the inner periphery is rotatably attached to the rear end portion of the bag case 3 formed. On the outer periphery of the screw ring 32, a number of anti-slip grooves 33 are provided in the axial direction.

  Then, with the eaves chip 1 inserted into the heater case 2 from the front end side, the front end portion of the temperature sensor 4 is inserted into the sensor insertion hole 10 of the eaves chip 1, and the heater case 2 is inserted into the heater case 2. The heel case 3 is attached from the front end side of the heel tip 1, and the recess 12 of the heel tip 1 and the protrusion 13 of the contact portion 25 are fitted to each other to position the heel tip 1 in the rotational direction. After the above, the screw ring 32 of the saddle case 3 is screwed to the mounting portion 26 of the heater case 2. As a result, the locking portion 9 at the front end of the heel case 3 is locked to the locking step portion 8 of the heel tip 1 and presses the heel tip 1 against the abutting portion 25. The temperature detecting unit 4 a at the front end of the temperature sensor 4 is sandwiched and fixed between the unit 9 and the contact unit 25, and the urging force of the sensor spring 30 is applied to the collar chip 1 in the sensor insertion hole 10. Elastically pressed to contact.

  Here, the height of the projection 13 in the direction of the axis L and the depth of the recess 12 in the direction of the axis L are determined when the projection 13 is not fitted in the recess 12, that is, the rear end of the heel tip 1. When a portion other than the recess 12 is in contact with the protrusion 13, the screw ring 32 occupies a position away from the attachment portion 26 of the heater case 2 and cannot be screwed to the attachment portion 26. When 13 is fitted into the recess 12, the screw ring 32 is formed in such a size that it can be screwed to the mounting portion 26. Thereby, the said heel chip | tip 1 can always be reliably fixed to a predetermined direction.

  In the embodiment, two recesses 12 and two protrusions 13 are formed, and they are disposed at positions asymmetric with respect to the axis of the solder chip 1 and the heater case 2 (the axis L of the solder iron). However, the number of the recesses 12 and the protrusions 13 may be one, or three or more. When three or more depressions 12 and protrusions 13 are provided, the depressions 12 and the protrusions 13 are irregularly arranged so that at least one central angle differs from the other without arranging the depressions 12 and the protrusions 13 at equal intervals, that is, at equal central angles. It is necessary to arrange at a central angle.

Alternatively, the recess 12 may be formed on the heater case 2 and the protrusion 13 may be formed on the saddle chip 1.
Furthermore, although the soldering iron of the said embodiment is a type of attaching and using to the working arm of an automatic soldering apparatus, this invention is applicable also to the soldering iron for manual use.

DESCRIPTION OF SYMBOLS 1 鏝 Tip 1a Tip 1b Body 2 Heater case 3 鏝 Case 4 Temperature sensor 4a Temperature detector 5 Electric heater 10 Sensor insertion hole 12 Depression 13 Protrusion 15 Sensor case 16 Temperature detection element 17 Lead wire 20 Outer cylinder 21 Inner cylinder 25 Contact part 26 Mounting part 26a Male screw part 28 Sensor guide 29 Spring seat 30 Sensor spring 32 Screw ring L Axis line

Claims (5)

A scissor tip comprising a body portion for heat transfer and a tip portion for soldering, and having a sensor insertion hole extending in the axial direction inside,
A cylindrical shape having an electric heater for heating the saddle tip, a mounting portion having a male screw cut in a part of the outer periphery, and disposed so as to surround the outer periphery of the trunk portion of the saddle tip A heater case,
The hook case is disposed so as to surround the outer periphery of the heater case, is engaged with the hook tip, has a rotatable screw ring at a rear end portion, and the screw ring is screwed to the mounting portion, thereby the hook tip. A cylindrical bowl case for fixing the heater case to the heater case;
A temperature detection element and a lead wire are accommodated in an elongated cylindrical sensor case, and the temperature detection element is disposed at the front end of the sensor case, thereby forming a rod-shaped sensor having a temperature detection portion at the front end. And is inserted into the heater case so as to be displaceable along the axis of the heater case, and is biased toward the front end side by a sensor spring, and the temperature detecting portion is a sensor insertion hole of the saddle chip. A temperature sensor that fits in and elastically contacts the heel tip;
A soldering iron characterized by comprising:   A rear end portion of the sensor case in the temperature sensor is supported by a sensor guide formed in the heater case so as to be displaceable, and a spring seat is fixed to the sensor case, and between the spring seat and the sensor guide. The soldering iron according to claim 1, wherein the sensor spring is interposed.   An annular abutting portion with which the rear end portion of the saddle chip abuts is formed in the heater case, and one of the rear end portion and the corresponding contact portion of the saddle chip is provided on the other side of the saddle tip. A recess and a projection for positioning in the rotation direction are formed, and the recess and the projection are arranged so as to be fitted to each other at one angle when the heel tip is rotated 360 degrees around the axis. The soldering iron according to claim 1 or 2, wherein   4. The soldering iron according to claim 3, wherein the two protrusions and the two dents are disposed at positions asymmetric with respect to the axis of the heater case and the iron tip. 5.   The screw ring of the saddle case occupies a position away from the mounting portion of the heater cap when the projection is not fitted in the recess, and can be screwed to the mounting portion when the projection is fitted into the recess. The soldering iron according to any one of claims 1 to 4, wherein:

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