JP2013148369A - Temperature sensor for soldering bit temperature measuring device, and soldering bit temperature measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease a measuring error of temperature, by substantially suppressing the release of heat through a supporting body stably supporting a sensor chip.SOLUTION: A temperature sensor 100 has a metallic sensor chip 102 with which a soldering bit is brought into contact; a thermo couple 103 in which a temperature measuring contact 106 is joined with the sensor chip; and a strip-shaped wire-netted supporting body 101 to be mounted with the sensor chip. The sensor chip 102 is arranged on a center surface in a longitudinal direction of the wire-netted supporting body 101, and the temperature measuring contact 106 of the thermo couple 103 is arranged on a back surface. The sensor chip 102 and the temperature measuring contact 106 are electrically welded in such a state, thereby integrally joining the sensor chip, the wire-netted supporting body, and the temperature measuring contact of the thermo couple. A soldering bit temperature measuring device body 10 has a pair of supporting pins 21 and 22 which can hold the wire-netted supporting body in a stretched state by fitting perforated installing portions 108 and 10 at both ends of the temperature sensor. One of the supporting pins 22 is provided so as to freely move in a direction adjusting a distance between the supporting pins.

Description

  The present invention relates to a temperature sensor for measuring the temperature of a soldering iron tip, and a soldering iron tip temperature measuring device to which the temperature sensor is attached for use.

  When soldering between electronic circuit board terminals with jumper wires, etc., it is important to control the temperature of the soldering iron tip. For this purpose, the temperature of the iron tip is measured by a temperature measuring device. . As a conventional soldering iron tip temperature measuring device, the one described in Patent Document 1 is known.

  In the tip temperature measuring device described in Patent Document 1, two dissimilar metal materials forming a thermocouple are arranged apart from each other, the dissimilar metal materials are brought into electrical contact with the tip, and the iron is used. The tip temperature is detected.

  However, this measuring apparatus has a problem that it is difficult to perform measurement because the tip needs to be in contact with both of the dissimilar metal materials separated from each other. Therefore, a sensor chip made of a metal material having high wettability with respect to solder is used as a member to contact the tip, and this sensor chip is mounted on a support made of a metal strip, and a thermocouple is mounted on the sensor chip. A tip temperature measuring device has been devised that uses a temperature sensor to which the temperature measuring contacts are joined.

Japanese Patent Laid-Open No. 10-144442

  However, it was found that when the sensor chip was mounted on a support made of a metal strip, the tip temperature could not be measured accurately because the heat of the sensor chip escaped through the support supporting the sensor chip. . Thus, there is an idea of making a slit in the support in order to reduce the substantial cross-sectional area of the support that becomes a path for heat to escape, but there is still a problem that the heat escape cannot be made sufficiently small.

  In consideration of the above circumstances, the present invention is a temperature sensor for a tip temperature measuring device in which the temperature measurement error is reduced by greatly suppressing the escape of heat through the support that stably supports the sensor chip. An object of the present invention is to provide a tip temperature measuring device to which the temperature sensor is attached and used.

The present invention employs the following means in order to solve the above problems.
That is, the temperature sensor for the tip temperature measuring device according to the first aspect of the present invention includes a metal sensor chip that contacts the tip, a thermocouple having a temperature measuring contact joined to the sensor chip, and a sensor chip. And a belt-like wire netting support body that is mounted and supported in a tensioned state by being supported by the tip temperature measuring device main body at both ends in the longitudinal direction.
Thereby, the escape of heat through the member that supports the sensor chip can be suppressed as much as possible. In other words, the wire mesh can reduce the substantial cross-sectional area of the path through which heat escapes, compared to a metal plate with the same outer dimensions and a metal plate with slits to reduce the substantial cross-sectional area. The amount of heat released from the sensor chip through the body can be reduced.

According to the second aspect of the present invention, the sensor chip is disposed on the front surface in the longitudinal direction of the support made of wire mesh, and the temperature measuring contact of the thermocouple is disposed on the back surface, and is electrically welded in that state. The sensor chip, a wire mesh support, and a thermocouple temperature measuring contact are integrally joined.
Thereby, the intensity | strength and integrity of a sensor principal part can be improved, and the temperature of a sensor chip can be measured accurately.

The invention according to claim 3 is characterized in that perforated mounting portions that are respectively fitted to the pair of support pins of the tip temperature measuring device main body are provided at both ends of the wire mesh support.
Thus, the temperature sensor can be easily set on the tip temperature measuring device main body and the temperature sensor can be easily replaced simply by fitting the attachment portion to the support pin of the tip temperature measuring device main body.

According to the invention of claim 4, each perforated mounting portion is made of a resin perforated fixed plate joined to both ends of a wire mesh support, and ends of each metal conductor wire of the thermocouple superimposed on the perforated fixed plate. A metal washer bonded to each other, and a cylindrical metal eyelet that caulks the washer and the perforated fixed plate through the through hole of the washer and the perforated fixed plate and the perforated fixed plate. The through hole is fitted to the tip temperature measuring device by fitting the through hole with the support pin of the tip temperature measuring device main body.
Thereby, the heat quantity which escapes to the support pin side of a tip temperature measuring device main body through the both ends of a metal-mesh support body can be made small.

A tip temperature measuring device according to a fifth aspect of the invention can hold the wire mesh support in a stretched state by fitting the perforated mounting portion of the temperature sensor according to any one of the third or fourth aspects. It has a pair of support pins arranged at a distance from each other, and at least one of the pair of support pins is provided so as to be movable in a direction to adjust the distance between the pair of support pins. Features.
As a result, the perforated mounting portion of the temperature sensor is fitted to each support pin in a state where the distance between the support pins is shortened, and in this state, the distance between the support pins is adjusted in the opening direction. The wire mesh support can be easily maintained in a tensioned state (with tension), and the sensor chip can be stably supported.

The invention of claim 6 is provided with a biasing means for biasing a support pin provided movably among the pair of support pins in a direction to open a distance between the pair of support pins. A pin moving operation mechanism is provided that moves a support pin provided movably against a force in a direction to reduce the distance between the pair of support pins.
As a result, the pin moving operation mechanism is operated to shorten the distance between the support pins, and the perforated mounting portion of the temperature sensor is fitted to each support pin, and in this state, the operation of the pin movement operation mechanism is stopped. By the action of the biasing means, the distance between the support pins can be adjusted in the opening direction, and thereby the wire mesh support of the temperature sensor can be easily kept in a tensioned state (with tension) And the sensor chip can be stably supported.

  According to the first aspect of the present invention, since the sensor chip (metal chip having high wettability with respect to solder) mounted on the thermocouple temperature measuring contact is mounted on the wire mesh support body, The escape of heat through the supporting member can be suppressed as much as possible. In other words, the wire mesh can reduce the substantial cross-sectional area of the path through which heat escapes, compared to a metal plate with the same outer dimensions and a metal plate with slits to reduce the substantial cross-sectional area. The amount of heat released from the sensor chip through the body can be reduced. Therefore, the temperature of the tip can be accurately measured by the thermocouple through the sensor chip. In addition, since the belt-shaped wire mesh is used as the sensor chip support, the sensor chip can be held in a stable posture, and the tip can be easily brought into contact with a small sensor chip. Therefore, it becomes easy to measure.

  According to the invention of claim 2, since the sensor chip, the temperature measuring contact of the thermocouple, and the metal mesh support are integrally joined by electric welding, the strength and the integrity of the sensor main part can be increased, and the sensor The chip temperature can be measured with high accuracy.

  According to invention of Claim 3, since the perforated attachment part which each fits with respect to a pair of support pin of a tip temperature measuring device main body is provided in the both ends of the metal-mesh support body, those attachments are provided. The temperature sensor can be easily set on the tip temperature measuring device main body and the temperature sensor can be easily replaced by simply fitting the part to the support pin of the tip temperature measuring device main body.

  According to the invention of claim 4, since both ends of the metal mesh support are not made of metal but are joined to the perforated fixed plate made of resin having low thermal conductivity, the both ends of the metal mesh support are passed through. The amount of heat escaping to the support pin side of the tip temperature measuring device main body can be reduced. In addition, the conduction path from the thermocouple to the tip temperature measuring device main body is secured through a washer overlaid on the fixed plate and a grommet that crimps the washer and fixed plate, ensuring stable measurement. can do.

  According to the invention of claim 5, at least one of the pair of support pins is provided so as to be movable in a direction for adjusting the distance between the pair of support pins, so that the distance between the support pins is reduced. In each of the support pins, the perforated mounting portion of the temperature sensor is fitted, and in that state, the distance between the support pins is adjusted in the opening direction, so that the wire mesh support body of the temperature sensor can be easily stretched (tension The sensor chip can be stably supported.

  According to the sixth aspect of the present invention, the pin moving operation mechanism is operated so that the distance between the support pins is shortened, and the perforated mounting portion of the temperature sensor is fitted to each support pin. By stopping the operation of the mechanism, it is possible to adjust the distance between the support pins in the direction of opening by the action of the urging means, so that the wire mesh support of the temperature sensor can be easily stretched (with tension) The sensor chip can be stably supported.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the tip temperature measuring apparatus with which the temperature sensor of embodiment of this invention was mounted | worn, (a) is a top view, (b) is a left view, (a) It is Ic-Ic arrow sectional drawing. . (A) is a plan view of the temperature sensor, (b) is an enlarged side sectional view of a fixing portion of the temperature sensor in the tip temperature measuring device, and (c) is a measurement of a sensor chip and a thermocouple constituting the temperature sensor. It is a principal part enlarged view which shows the relationship between a warm junction and a metal-mesh support body. It is explanatory drawing of how to make the said temperature sensor.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram of a tip temperature measuring device equipped with the temperature sensor of the embodiment. The tip temperature measuring device 1 includes a tip temperature measuring device main body 10 and a temperature sensor 100. The tip temperature measuring device main body 10 has a control device (not shown) built in a case 11 made of a resin molded product, and has a measuring unit 12 on one side of the surface of the case 11 and is operated on the other side. Part 13 is provided.

  The operation unit 13 includes a display unit 4 for displaying the detected temperature, a power switch 5 for turning on / off the power of the apparatus, and a hold / instruction for holding and displaying the measured peak value and switching various modes. A mode switch 6 and a sensor reset switch 7 for resetting the integrated value of the evaluation values to zero when the life of the temperature sensor 100 is evaluated are provided.

  The measurement unit 12 is surrounded by an annular scattering prevention wall 15. When the tip temperature of the soldering iron H is measured by bringing the tip of the soldering iron H into contact with the temperature sensor 100 set on the measuring unit 12, the scattering prevention wall 15 scatters solder and flux to the outside of the measuring unit 12. This is a bank-like raised wall for preventing the temperature sensor 100 and is also provided to protect the temperature sensor 100.

  On the inner bottom surface of the measurement unit 12 surrounded by the scattering prevention wall 15, two support pins 21 and 22 are erected in parallel upward at a distance from each other. Of the two support pins 21, the one far from the operation unit 13 is a fixed support pin 21, and the one near the operation unit 13 is a movable support pin 22. The movable support pin 22 is provided so as to be movable in a direction in which the distance between the pair of support pins 21 and 22 is adjusted (that is, a direction along a straight line connecting the two support pins 21 and 22).

  As shown in FIG. 2B, the inner bottom surface of the measurement unit 12 is configured with a flat bottom wall 17, and the base end portion 21 b of the support pin 21 on the fixed side is inserted into the bottom wall 17 and fixed. Has been. Further, a pin support portion 37 of the tension lever 30 assembled to the case 11 is disposed at a portion that supports the base end portion 22 b of the movable support pin 22. The tension lever 30 is a component made of a resin molded product separate from the case 11.

  On the bottom wall 17 of the measuring part 12 of the case 11, the pin support part 37 of the tension lever 30 can be moved along the moving direction of the support pin 22 on the movable side, and the upper movable gap 18 and the upper side. A movable space 19 is provided. The lower movable gap 18 is covered with a slide wall 38 that prevents the pin support portion 37 from falling off the movable gap 18, so that solder and flux do not enter the inside of the case 11 through the movable gap 18. Yes. In addition, the entrance of the movable space 19 is covered with a rubber washer 40 fitted with the support pin 22 so that solder and flux do not enter the inside of the case 11 through the movable space 19.

  The base end portion 22 b of the movable support pin 22 is inserted and fixed to the pin support portion 37 of the tension lever 30. The two support pins 21 and 22 on the fixed side and the movable side have the same shape, the heads 21a and 22a at the tip are formed in a conical shape, and the constricted portions 21c and 22c below the two are connected to both ends of the temperature sensor 100. The mounting portions 108 and 109 are fitted and held. Further, the base end sides of the support pins 21 and 22 are electrically connected to a control device (not shown) via electrical connection portions 26 and 27. In addition, the inner bottom surface of the measuring unit 12 is covered with a heat shield plate 50 made of aluminum or the like in order to protect the bottom wall 17 of the resin case 11.

  As shown in FIG. 1A, the tension lever 30 that supports the movable support pin 22 has a lever operation portion 31 exposed on the side surface of the case 11, and the lever operation portion 31 and the pin support portion 37. The movable support pin 22 is attached to the case 11 so that it can be rotated within a plane in which the movable support pin 22 moves. Further, between the tension lever 30 and the case 11, a pin 33 and a long hole 34 that are slidably engaged with each other are provided for smooth rotation of the tension lever 30.

  Further, the tension lever 30 is biased in one rotational direction by a spring (biasing means) 35, whereby the movable support pin 22 opens a distance between the support pins 21 and 22 (arrow). A direction). Thus, when the lever operating portion 31 is pressed in the direction of arrow B, the tension lever 30 rotates in the direction of arrow C against the urging force of the spring 35, so that the support pin 22 on the movable side is It moves in the direction of arrow D against the urging force.

  Here, the tension lever 30 having the pin support portion 37 and the lever operation portion 31 and the rotation shaft 32 that rotatably supports the tension lever 30 are supported against the urging force of the spring 35 on the movable side. A pin moving operation mechanism is configured to move 22 in a direction to reduce the distance between the support pins 21 and 22.

Next, the temperature sensor 100 will be described in detail with reference to FIG.
The temperature sensor 100 detects the tip temperature of the soldering iron H and outputs an electric signal. The belt-plate-shaped wire mesh support 101 (for example, the wire diameter is 0.02 to 0.2 mm, 50 Sensor chip 102 made of a metal (for example, a metal with high solder wettability such as white or iron) that contacts the soldering iron H tip, A thermocouple 103 composed of a pair of different metal conductors 104 and 105 in which a temperature measuring contact 105 is joined to the sensor chip 102, and a pair of support pins 21 of the tip temperature measuring device main body 10 at both ends of the wire mesh support 101, 22 are provided with perforated mounting portions 108 and 109 provided so as to be fitted to each of them.

  The dissimilar metal conductors 104 and 105 constituting the thermocouple 103 are covered with a sleeve 107 at portions other than both ends. As shown in FIG. 2C, a sensor chip 102 is disposed on the front surface in the longitudinal direction of the wire mesh support 101, and a temperature measuring contact 106 of a thermocouple 103 is disposed on the rear surface. By welding (spot welding), the sensor chip 102, the wire mesh support 101, and the temperature measuring contact 106 of the thermocouple 103 are integrally joined. The wire mesh support 101 is held in a stretched state by being supported by the support pins 21 and 22 of the tip temperature measuring device main body 10 by mounting portions 108 and 109 provided at both ends in the longitudinal direction.

Next, how to make the temperature sensor 100 and the detailed configuration of the attachment portions 108 and 109 at both ends will be described.
The perforated attachment portions 108 and 109 at both ends of the temperature sensor 100 are made of resin (for example, acrylic) disk-like plates in which projecting pieces 110a are joined to both ends of the wire mesh support 101 by thermal welding. A perforated fixed plate 110, a metal (for example, SUS) washer 111 that is overlapped with the perforated fixed plate 110, and ends of the metal conductors 104 and 105 of the thermocouple 103 are joined by electric welding, and a washer. A cylindrical Ni-plated metal eyelet 112 that crimps the washer 111 and the perforated fixed plate 110 through the through hole 111 and the perforated fixed plate 110 and the fixed plate 110 is heat-welded. And heat shrinkable tubes 113 and 114 mounted so as to cover the portion. The heat shrinkable tubes 113 and 114 on both sides are color-coded to prevent reverse mounting of the temperature sensor 100 on the support pins 21 and 22 of the tip temperature measuring device main body 10.

  When making this temperature sensor 100, as shown in FIG. 3, the wire-mesh support body 101 and the fixed plate 110 are prepared and joined by thermal welding. Further, the wire mesh support 101, the sensor chip 102, and the temperature measuring contact 106 of the thermocouple 103 are joined by electric welding. Further, the end portions of the metal conductive wires 104 and 105 of the thermocouple 103 are electrically welded to the washer 111, and the washer 111 and the fixed plate 110 are crimped by the eyelet 112. Finally, the heat welding portion of the fixed plate 110 is covered with the heat shrinkable tubes 113 and 114 and heated to shrink the heat shrinkable tubes 113 and 114. Thus, the temperature sensor 100 is completed.

  When the temperature sensor 100 is attached to the tip temperature measuring device main body 10, the lever operating portion 31 of the tension lever 30 is pressed as indicated by an arrow B, and the movable support pin 22 is moved inward (in the direction of the arrow D). ) And the through holes of the eyelets 112 of the mounting portions 108 and 109 at both ends of the temperature sensor 100 are fitted into the support pins 21 and 22. Next, when the lever operating part 31 is released in this state, the support pin 22 on the movable side is moved in the direction (in the direction of the arrow A) to open the distance between the support pins 21 and 22 by the force of the spring 35, thereby supporting the wire mesh. The temperature sensor 100 is held in a state where tension is applied to the body 101.

  In this state, the power switch 5 is turned on, and the tip of the soldering iron H is brought into contact with the sensor chip 102 of the temperature sensor 100. Then, the detected temperature is displayed on the display unit 4. By visually recognizing it, the operator can check the tip temperature.

  In the temperature sensor 100 of the tip temperature measuring device 1, a sensor chip (a metal chip having high wettability with respect to solder) 102 bonded to a temperature measuring contact 106 of a thermocouple 103 on a wire mesh support 101 is provided. Since it is mounted, the escape of heat through the member that supports the sensor chip 102 can be suppressed as much as possible. In other words, the wire mesh can reduce the substantial cross-sectional area of the path through which heat escapes, compared to a metal plate having the same outer dimensions and a metal plate with slits to reduce the substantial cross-sectional area. The amount of heat released from the sensor chip 102 through the support 101 can be reduced. Therefore, the temperature of the tip can be accurately measured by the thermocouple 103 via the sensor chip 102.

  In addition, since the belt-shaped wire mesh is used as the support for the sensor chip 102, the sensor chip 102 can be held in a stable posture, and the tip can be easily brought into contact with the small sensor chip 102. Therefore, it becomes easy to measure.

  Further, since the temperature measuring contact 106 of the sensor chip 102 and the thermocouple 103 and the wire mesh support 101 are integrally joined by electric welding, the strength and integrity of the sensor main part can be increased. The temperature can be measured with high accuracy.

  In addition, since both ends of the wire mesh support 101 are provided with perforated mounting portions 108 and 109 that respectively fit to the pair of support pins 21 and 22 of the tip temperature measuring device main body 10, The temperature sensor 100 can be easily set on the tip temperature measuring device main body 10 simply by fitting the mounting portions 108 and 109 to the support pins 21 and 22 of the tip temperature measuring device main body 10. Exchange is also easy.

  Further, both ends of the metal mesh support 101 are not made of metal but are joined to the perforated fixed plate 110 made of resin having low thermal conductivity, so that the tip is passed through both ends of the metal mesh support 101. The amount of heat that escapes to the support pins 21 and 22 side of the temperature measuring device main body 10 can be reduced. In addition, a conduction path from the thermocouple 103 to the tip temperature measuring device main body 10 is ensured through a washer 111 overlaid on the fixed plate 110 and a grommet 112 that crimps the washer 111 and the fixed plate 110. So stable measurement can be guaranteed.

  Moreover, according to the tip temperature measuring apparatus 1 having the above-described configuration, at least one of the pair of support pins 21 and 22 is provided movably in a direction in which the distance between the pair of support pins 21 and 22 is adjusted. Therefore, the perforated mounting portions 108 and 109 of the temperature sensor 100 are fitted to the support pins 21 and 22 in a state where the distance between the support pins 21 and 22 is shortened, and in this state, between the support pins 21 and 22 By adjusting the distance in the opening direction, the wire mesh support 101 of the temperature sensor 100 can be easily maintained in a tensioned state (with tension), and the sensor chip 102 can be stably supported. it can.

  Further, in the state where the distance between the support pins 21 and 22 is shortened by operating the lever operation portion 31 of the tension lever 30 constituting the pin moving operation mechanism, the hole mounting portion 108 of the temperature sensor 100 is attached to each support pin 21 and 22. 109, and in this state, the operation of the lever operating portion 31 is stopped, and the distance between the support pins 21 and 22 can be adjusted in the opening direction by the action of the spring 35. The wire mesh support 101 of the sensor 100 can be easily maintained in a tensioned state (with tension), and the sensor chip 102 can be stably supported.

DESCRIPTION OF SYMBOLS 1 Tip temperature measuring device 10 Tip temperature measuring device main body 21 Fixed side support pin 22 Movable side support pin 30 Tension lever 31 Lever operation part 35 Spring (biasing means)
DESCRIPTION OF SYMBOLS 100 Temperature sensor 101 Metal-made support body 102 Sensor chip 103 Thermocouple 106 Temperature measuring contact 108 Attaching part 109 Attaching part 110 Fixed plate 111 Washer 112 Eyelet H Soldering iron

Claims (6)

A metal sensor chip that contacts the tip;
A thermocouple in which a temperature measuring contact is joined to the sensor chip;
While mounting the sensor chip, a belt-shaped wire mesh support that is maintained in a stretched state by being supported by the tip temperature measuring device main body at both ends in the longitudinal direction;
A temperature sensor for a tip temperature measuring device.   The sensor chip is disposed on the front surface of the metal mesh support in the longitudinal direction and the temperature measuring contact of the thermocouple is disposed on the back surface, and the sensor chip and the metal mesh are electrically welded in that state. The temperature sensor for a tip temperature measuring device according to claim 1, wherein the support and the temperature measuring contact of the thermocouple are integrally joined.   The perforated attachment part which fits with respect to a pair of support pin of a tip temperature measuring device main body, respectively is provided in the both ends of the said metal mesh support body, The Claim 1 or 2 characterized by the above-mentioned. Temperature sensor for tip temperature measuring device.   The perforated mounting portions are made of resin perforated fixed plates joined to both ends of the wire mesh support, and the end portions of the metal wires of the thermocouple are joined to the perforated fixed plates. A metal washer that passes through the through hole of the washer and the through hole of the perforated fixed plate and caulks the washer and the perforated fixed plate. The tip temperature measuring device according to claim 3, wherein the tip temperature measuring device is attached to the tip temperature measuring device by fitting a through hole with a support pin of the tip temperature measuring device main body. Temperature sensor.   A pair of supports arranged at intervals to hold the wire mesh support in a stretched state by fitting the perforated mounting portion of the temperature sensor according to any one of claims 3 and 4. A tip temperature measuring device having a pin, wherein at least one of the pair of support pins is movably provided in a direction of adjusting a distance between the pair of support pins.   A biasing means for biasing a support pin provided in a movable manner among the pair of support pins in a direction to increase a distance between the pair of support pins is provided, and against a biasing force of the biasing means. 6. A tip temperature measurement device according to claim 5, further comprising a pin moving operation mechanism that moves the movable support pin in a direction to reduce a distance between the pair of support pins. apparatus.

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