JPH0132765Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention Industrial Application Field The present invention relates to an endothermic clip that protects electronic components from thermal damage during soldering.

Conventional Technology Conventionally, in order to protect electronic components from thermal damage during soldering, the lead wires, which are the heat transfer path from the heating point to the electronic components, are clipped with metal tweezers, needle-nose pliers, or other clips. , soldering work is performed while dissipating heat to the clip side.

Problems that the invention aims to solve In the conventional method described above, when soldering a large number of parts in succession for a long period of time, the temperature of the clip gradually rises and its function as a heat sink deteriorates. There was a risk of deterioration or destruction.

Means for Solving the Problems in the Structure of the Invention The present invention, which solves the problems in the prior art described above, consists of a clip body in which a flow path for reversing the cooling medium and a mechanism for fixing the temperature measuring element are formed inside the clip body; The cooling medium supply section is configured to include a cooling medium supply section that supplies a cooling medium to the cooling medium supply section, and a control section that controls the cooling medium supply section so as to keep the temperature detected by the temperature measuring element below a predetermined value.

The operation of the present invention will be explained in detail below using examples.

Embodiment FIG. 1 is a functional block diagram showing the configuration of an embodiment of the present invention. This endothermic clip device includes a clip body 10, a cooling water supply unit 20 that includes a cooling water tank 23, a water pump 24, and a motor 25 for supplying cooling water to the clip body 10, and a cooling water supply section 20 that controls the detected temperature of the clip body 10. It is comprised of a control section 30 that controls the operation of the cooling water supply section 20 based on the above.

FIG. 2 is a sectional view showing an example of the structure of the clip main body 10 of FIG. 1. This clip body 10
consists of a first jaw 11, a second jaw 12, a pin 13 that engages these jaws to open and close them, and a leaf spring 14 that drives both jaws in the closing direction. .

Inside the first jaw 11, a cooling water flow path 15 is provided.
is provided. This flow path 15 guides the cooling water supplied from the flexible hose 21 at the rear end of the first jaw 11 to the tip of the first jaw 11 and diverts it from the tip. Similarly, the jaw 11 is configured to be returned to the flexible hose 22 at its rear end.

On the other hand, inside the second jaw 12, a thermocouple 31 is provided.
A hole 18 for fixing is formed. Hole 1
8 is configured such that the tip of the thermocouple 31 is pulled in from the rear end of the second jaw 12, guided to the tip of the jaw 12, and fixed there.

The thermoelectromotive force (voltage) of the thermocouple 31 is controlled by the control unit 30
is supplied to one input terminal of the differential amplifier circuit 32. Note that the other terminal of the thermocouple 31 is grounded via a cold junction (not shown). A reference voltage Vref is supplied from a voltage divider 33 to the other input terminal of the differential amplifier circuit 32 . Differential amplifier circuit 32
outputs a voltage proportional to the difference voltage between the reference voltage Vref and the output voltage of the thermocouple 31.

Therefore, when the temperature of the clip body 10 rises above the temperature corresponding to the reference voltage Vref due to long-term soldering work, the output of the differential amplifier circuit 32 is reversed from a positive voltage to a negative voltage, and the transistor 34 becomes conductive. do. Accordingly, the voltage applied to the DC motor 25 increases, the rotational speed increases, and the amount of water sent from the cooling water tank 23 to the clip body 10 by the water pump 24 increases. As the water pump 24, a gear pump or the like is used, which has a small amount of water to be fed and a high discharge pressure.

As a result, as the temperature of the clip body 10 rises, the amount of cooling water supplied to it increases, the cooling capacity increases, and the temperature of the clip body 10 changes from rising to falling. When the temperature of the clip body 10 falls below a predetermined reference value, the transistor 34 becomes non-conductive, and the motor 25 is driven at low speed at a low voltage obtained by subtracting the voltage drop across the resistor 35 from the power supply voltage.

The clip body 10 as described above can be made by any suitable method. For example, two flat plates having the outline of the first jaw part may be created, the flow path 15 is excavated, and then the two plates may be bonded together by soldering or brazing. The same applies to the second jaw. Further, the material of the clip body 10 may be any suitable material such as steel, brass, or aluminum alloy.

Although a configuration using water as the cooling medium has been illustrated, it is also possible to use a cooling medium with a boiling point slightly lower than room temperature, such as alcohol with a lower boiling point than water or the product names Freon 11 and Freon 114, and vaporize it within the clip body 10. If the configuration is such that the cooling capacity can be further increased.

Moreover, although a thermocouple is illustrated as an example of a temperature measuring element, other suitable temperature measuring elements such as a thermistor may be used.

Furthermore, although the cooling medium flow path and the fixing mechanism for the thermometry element are installed in different jaws, they may be formed in the same jaw.

Effects of the invention As explained in detail above, according to the invention,
The structure automatically detects the rise in temperature of the clip body and cools it down to below a predetermined value, so the temperature of the clip body can be kept constant even when soldering many parts in succession for a long time. This has the effect of effectively preventing deterioration and destruction of electronic components due to heat.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram showing the configuration of an embodiment of the present invention, and FIG. 2 shows the clip main body 10 of FIG.
FIG. 2 is a cross-sectional view showing an example of the configuration. 10...Clip body, 11...First jaw part,
12... Second jaw, 13... Pin that engages the first and second jaws, 14... Leaf spring, 15... Channel for commutating the cooling medium, 20... Cooling medium supply Part, 21, 22... hose, 23... cooling water tank,
24...Water pump, 25...Motor, 30...
...Control unit, 31...Temperature detection element, 32...Differential amplifier circuit.

Claims (1)

[Scope of Claim for Utility Model Registration] A clip part having a flow path for commutating a cooling medium and a mechanism for fixing a temperature measuring element formed therein; a cooling medium supply part supplying a cooling medium to the clip body; and the temperature measuring element. A control section for controlling the cooling medium supply section so as to maintain a temperature detected by the cooling medium below a predetermined value.