JPH0729661Y2 - Heating and drying equipment for printed circuit boards dipped in flux - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating and drying apparatus for a printed circuit board dipped in a flux, which is used when soldering electric parts and the like incorporated in the printed circuit board.

[0002]

2. Description of the Related Art A lead of an electric component is positioned by inserting a lead of the electric component into a hole provided at a required place of the printed circuit board on which an electric circuit is formed, and then the lead of the electric component and the required place of the printed board. It is practiced to connect the so that it can be energized by soldering.

This soldering is carried out as follows. That is, the stove is placed below the stationary frame, and the printed circuit board immediately after being immersed in the flux is located above the stove. Place it horizontally, heat it to the specified temperature with the heat of the stove to dry the flux, and then immerse the bottom surface of this printed circuit board in the molten solder for a short time and then pull it up. ing.

[0004]

In the above-mentioned conventional heating and drying of the printed circuit board, care must be taken not to overheat the printed circuit board. For this reason, the operator touches the circuit board with a finger and The temperature is checked in a sensational manner, which is cumbersome and does not allow accurate heating and drying. An object of the present invention is to provide a heating and drying apparatus for a printed circuit board dipped in a flux, which can solve the above problems.

[0005]

To achieve the above object, the present invention provides a stationary frame with a guide track and guides a heater equipped with an electric heating rod on the track so that the heater can be moved horizontally. In the upper part of the frame, a pair of support parts for mounting the bridge-shaped support frame of the printed circuit board on the side above the heater is formed, and on the other side, on the side part of the frame. A fan is provided for sending air to the lower side of the printed circuit board, and a temperature detection for detecting that the air temperature at this position is above a certain value at a position near the lower surface of the printed circuit board and above the heater. And a fan is activated in relation to a detection signal of the detector.

[0006]

In general, a plurality of printed circuit boards dipped in flux are placed on the support frame in a line along the guide track.
When these heaters are moved horizontally, these printed circuit boards are sequentially and effectively heated and dried by the heat rays emitted from the heating rods of the heaters. At this time
The temperature of the air just below the printed circuit board is detected by the temperature detector, the fan is activated in connection with this detection signal, and the ambient air is supplied below the printed circuit board. In addition to being internally heated, the flux generated by the fan effectively evaporates the flux and the flux is quickly dried.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the device of the present invention, in which a stationary frame 1 is a rectangular frame in which the horizontal bar member 1a, the horizontal bar member 1b and the vertical bar member 1c are connected by a connecting plate 1d. .

Reference numerals 2a and 2b denote a pair of guide tracks which are horizontally installed in the stationary frame 1 in the longitudinal direction, and each of which has a groove-shaped cross section.

Reference numerals 3a and 3b denote heaters having electric heating rods 4, which are connected to each other to form an integral body, and an operating handle 5 is provided on one side in a protruding shape, and each lower surface is provided with a handle. The engaging pieces 6 ...
It can be freely moved in the horizontal direction by fitting it in the groove. Here, 7 is a reflector and 8 is a protective grating.

A and B are supporting portions on which a supporting frame, which will be described later, is placed, and serve the upper edge of the connecting plate 1d connecting the upper portions of the vertical members 1c ... Here, the coupling plate 1d has both ends bent at 90 degrees, and rollers 9a and 9b are axially mounted between the bent parts.

Reference numerals 10a and 10b denote electric fans mounted on the respective side surfaces of the stationary frame 1 facing each other in the longitudinal direction. The wind generated by the rotation of the blades 11 is slightly above the longitudinal direction of the stationary frame 1. It is supposed to go to.

Reference numeral 12 denotes a temperature detector which is erected from the protective grid 8 of the heater 3b, and detects that the temperature of the air at an appropriate height above the heater 3b has risen above a predetermined constant temperature and is a detection signal. And the fans 10a and 10b are automatically operated in association with this detection signal.

Reference numeral 13 is a support frame for mounting the printed circuit boards w ... In a bridge shape, and includes a pair of rod members 13a and 13b mounted on the support portions a and b and both ends thereof. The connecting plates 13c and 13d for connection form a rectangular frame.

The soldering of the printed circuit board using the product of the present invention having such a structure is performed as follows.

First, the printed circuit board w on which the required circuit c as shown in FIG. 2 is formed is held horizontally, and the leads r ... Of the electric component e are inserted into the through holes p provided therein from above. After the electric component e is inserted and positioned, the printed circuit board w is supported by the sandwiching tool t as shown in FIG. 3, and the lower surface thereof is immersed in the flux liquid in the flux tank.
Next, the printed circuit board w is placed in a bridge shape on the support frame 13 moved to the vicinity of the flux tank.

After the number of the printed circuit boards w thus processed reaches an appropriate number, the supporting frame 13 is mounted on the supporting portions a and b of the stationary frame 1 as shown in FIG. 3a and 3b are kept in the operating state. As a result, the printed circuit boards w above the heaters 3a and 3b are effectively heated by the heat rays emitted from the electric heating rods 4 and 4, and the flux is dried.

When the air above the heater 3b and directly below the printed circuit board w reaches about 100 ° C., the temperature detector 12 detects it and outputs a detection signal.
In connection with this, the fans 10a, 10b are operated, the temperature of the same place is lowered because the air of the atmospheric temperature is supplied to the same place, and when the temperature of the same place reaches about 80 ° C. The temperature detector 12 detects the fans 10a, 10
b is stopped, and this operation is repeated thereafter.

For this reason, the printed circuit boards w are always heated to about 80 to 100 ° C., and when the fans 10a and 10b are operated, the flux generated by the fans 10a and 10b is effective. It will be evaporated to dry quickly.

The printed circuit board w thus dried is held by the sandwiching tool t in the same manner as shown in FIG. 3, and the lower surface thereof is immersed in the solder liquid in the solder bath heated to about 240 ° C. , By this, the hole p of the printed circuit board w
In addition to the solder penetrating into a gap between the lead r and the lead r inserted therein, the solder adheres to a required portion of the lower surface of the printed circuit board w.

After that, the printed circuit board w is pulled up from the solder bath, whereby the solder is solidified and the electric parts e and the like are soldered to complete the required circuit. The unnecessary length portion of the lead r is cut and removed.

When the printed circuit board w is continuously processed, when the printed circuit board w having the flux dried is picked up from the support frame 13 mounted on the stationary frame 1, the heaters 3a and 3b are held by holding the handle 5. Guide track 2a,
It is moved below the other undried printed circuit board w along 2b.

By doing so, the next printed circuit board w is dried while soldering the dried printed circuit board w, and the work can be performed without wasting time.

[0023]

As described above, according to the present invention, the flux of the printed circuit board can be quickly dried at the optimum temperature, and the soldering of the printed circuit board can be efficiently performed.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which electric components are incorporated in a printed board.

FIG. 3 is a diagram showing an example of handling a printed circuit board.

[Explanation of symbols]

 1 Stationary frame 2a and 2b Guide track 3a and 3b Heater 4 Electric heating rod 10a and 10b Fan 12 Temperature detector 13 Support frame w Printed circuit board a and b Support part

Claims (1)

[Scope of utility model registration request] 1. A stationary frame is provided with a guide track, and a heater equipped with an electric heating rod is guided on the track so that the heater can be moved horizontally. On the other hand, a print is made on the upper part of the frame above the heater. A pair of supporting portions for mounting the support frame on which the board is bridged is formed in a bridge shape, and on the other side, a fan for sending air to the lower side of the printed circuit board is provided on the side portion of the frame. In addition, a temperature detector for detecting that the temperature of the air at this location has risen above a certain value is provided at a location above the heater in the vicinity of the lower surface of the printed circuit board, and related to the detection signal of the detector. An apparatus for heating and drying a printed circuit board immersed in a flux, wherein a fan is operated.