JPH028629Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a preheater for an automatic soldering machine that can protect a printed circuit board from the heat of the preheater when a conveyance device for conveying the printed circuit board suddenly stops.

[Conventional technology]

Automatic soldering equipment is equipped with processing equipment such as a fluxer, a preheater, a soldering bath, a cooling machine, etc., and printed circuit boards are sequentially transported to these processing equipment by a conveying device and soldered.

By the way, the transport device of an automatic soldering device naturally stops running in the event of a power outage, but it is also designed to be able to stop running in the event of an emergency such as a fire or a man-made disaster. When the transport device stops running, even if the power to the automatic soldering device is cut off, the printed circuit board on the preheater will be heated by residual heat, and the printed circuit board immersed in the solder bath will be heated by molten solder, so it will not heat up. You will receive damage.
The printed circuit board that is immersed in the solder bath can be pulled up from the solder bath when the transport device suddenly stops running, but the printed circuit board that is on the preheater cannot be moved.
The heat from the preheater can cause thermal damage to the printed circuit board and electronic components mounted on the printed circuit board, resulting in damage. In particular, printed circuit boards used in computers are made up of multiple layers of expensive printed circuit boards, and the electronic components mounted on them are also highly functional, making them extremely expensive. Therefore, when soldering printed circuit boards for computers, if the conveyance device of an automatic soldering machine suddenly stops, it will cause a great deal of damage.

[Problem that the invention attempts to solve]

If the printed circuit board cannot be moved from the preheater when the transport device suddenly stops, it is sufficient to cut off the heat from the preheater. One idea to cut off the heat is to cover the preheater, which is the heat source, but the mechanism would be very complicated and the equipment would be expensive.

The object of the present invention is to provide a preheater for automatic soldering equipment equipped with a heat cutoff device that is simple in structure and inexpensive in equipment.

[Means for solving problems]

Generally, a nichrome wire is used in the preheater of an automatic soldering machine, and heating is performed using convection heat and radiant heat generated from the wire.

The inventor of this invention knows that in order to block the heat from the preheater, it is sufficient to place a shield between the heat source and the heated object, but it is also possible to have a shielding effect by passing cold air instead of the shield. This discovery led to the completion of this invention. In the present invention, a nozzle capable of blowing cold air from the side of the upper surface of the preheater is installed near the preheater, and cold air is blown from the nozzle when the conveyance device suddenly stops running.

[Effect]

The cold air blown from the side of the pre-heater blows away the heat from the pre-heater to block the heat, and it also stops on the pre-heater and hits the printed circuit board that is heating up, cooling the printed circuit board. .

〔Example〕

The present invention will be explained below based on the drawings.

A large number of nichrome wire heaters 2... are attached to the preheater 1, and a cold air blowing nozzle 3 is installed near the preheater. The cold air blowing nozzle is installed on one side of the preheater, slightly above the top surface of the preheater. A slit 4 for blowing out cold air is formed in the cold air blowing nozzle 3, and the slit is oriented laterally to the upper surface of the preheater.
The cold air blowing nozzle is connected to a cold air generation source such as an air compressor (not shown) or an inert gas cylinder such as carbon dioxide gas or nitrogen gas, and when the soldering equipment of an automatic soldering machine suddenly stops, the cold air generation source will be removed. Cold air is now being blown from here.

Next, the usage situation of the preheater of the present invention having the above structure will be explained.

The automatic soldering device is equipped with processing devices such as a fluxer (not shown), a preheater 1, a solder bath, and a cooler (not shown), and the printed circuit board 5 is engaged with an endless chain 6 of a conveying device. Soldering is carried out by passing through these processing devices while being held by a carrier 7 that moves.

As shown in FIG. 1, when the endless chain 6 stops running while the printed circuit board 5 is on the preheater 1, cold air is sent from a cold air source (not shown) to the cold air blowing nozzle 3, and cold air is emitted from the slit 4. It blows out the heat from the preheater laterally across the top surface of the preheater to cut it off, and also hits the bottom surface of the printed circuit board to cool the printed circuit board.

[Effect of idea]

The preheater of this invention has a nozzle installed near the preheater that can blow out cold air when the transport device suddenly stops, so even if the transport device suddenly stops, the printed circuit board on the preheater can be heated by the preheater. It has the excellent effect of protecting against heat and preventing heat damage.

[Brief explanation of drawings]

FIG. 1 is a front cross-sectional view of an embodiment of the present invention when the printed circuit board is placed on a preheater, and FIG. 2 is a plan view of the embodiment of the present invention. 1...Preheater, 3...Cold air blowing nozzle, 4...Slit.

Claims (1)

[Scope of utility model registration request] An automatic device characterized by having a cold air blowing nozzle installed near the preheater that can blow off the heat of the preheater by blowing cold air from the side onto the top surface of the preheater when the conveyance device that conveys the printed circuit board suddenly stops. Preheater for soldering equipment.