JPH0214857Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fluxer that is installed in an automatic soldering machine and applies flux to a printed circuit board.

[Conventional technology]

Flux used for soldering printed circuit boards is made by dissolving solid components such as pine resin and activator in an alcohol-based solvent to a concentration suitable for soldering.

Conventionally, when soldering printed circuit boards using an automatic soldering machine, a flux having the concentration most suitable for the soldering has been added to a fluxer. However, the solvent component of flux evaporates even if it is left in the atmosphere, but with a fluxer, air is pumped into the flux to cause foaming, so the solvent component evaporates even more rapidly, and the initial state is lost in a short period of time. This results in a dense flux with more solid components than concentration. If you solder a printed circuit board with a highly concentrated flux, the amount of flux applied will be large, and the flux will ooze out to the surface and adhere to unnecessary areas, deteriorating the functionality of electronic components mounted on the surface. . In addition, highly concentrated flux leaves a large amount of flux residue, which not only becomes sticky and inconvenient to handle, but also causes poor insulation and corrosion.
Furthermore, even if the flux residue is cleaned after soldering, there are many inconveniences such as the cleaning is time consuming and the cleaning solution is consumed.
In order to solve the above-mentioned problems, a mixed type fluxer has been adopted, in which a concentrated flux stock solution and a diluent are supplied to the fluxer, and these are mixed in the fluxer to create a flux suitable for soldering printed circuit boards. There is. As shown in Fig. 3, this mixed fluxer includes a fluxer 1, a stock solution tank 2, a diluent tank 3, a pump 4, a supply pipe 5,
It consists of 6 sensors. The fluxer 1 has a flux application section 7 and a flux material supply section 8, and a foaming tube 9 is installed in the flux application section 7, and the flux around the foaming tube is foamed by sending compressed air into the foaming tube. , and attach it to a printed circuit board that passes above the fluxer.
A supply pipe 5 for supplying the flux stock solution and diluent to the fluxer is inserted into the flux material supply section 8, and near the supply pipe 5, the flux specific gravity, temperature, etc.
A sensor 6 is installed to detect the liquid level height.

The flux stock solution and diluent are supplied by selecting the necessary materials according to the commands of the sensor, opening the valve V to be supplied, and activating the pump 4 to supply the material from the supply pipe 5 into the fluxer. There is.

However, with conventional mixed fluxers, the flux, which is supposed to have an appropriate concentration according to the sensor's command, is either too thick than the predetermined concentration, causing the above-mentioned problems, or too thin, causing soldering defects. It was hot. This is caused by the non-uniform flux concentration within the fluxer.

[Purpose of invention]

The object of the present invention is to provide a fluxer in which the flux within the fluxer is uniform and the flux is always in an optimal state for soldering printed circuit boards.

[Structure of the idea]

When the present inventor investigated the cause of concentration non-uniformity in mixed flux, it was discovered that there was a problem with the supply pipe inserted into the fluxer.

That is, the fluxer 1 is connected to the flux applying section 7.
and a flux material supply section 8, and since the supply pipe for supplying the flux stock solution and diluent to the fluxer was simply inserted into the flux material supply section 8 as shown in Fig. 3, the flux application section and flux This is because the flux in the material supply section did not have a uniform composition immediately. Moreover, the sensor 6 that detects the state of the flux is installed in the flux supply section 8 and is directly affected by the flux stock solution or diluent that flows in from the supply pipe 5, causing the flux in the supply section to follow the instructions. In the flux application area, the concentration of flux was either high or low.

In view of the above-mentioned causes, the present invention is designed to supply flux undiluted solution and diluent not only to the flux material supply section, but also to
The present invention was completed by focusing on the fact that if the flux is supplied throughout the fluxer, the flux inside the fluxer will always be uniform.

The feature of the present invention is that flux materials such as flux undiluted solution or diluent are supplied into the fluxer according to the command of the sensor inside the fluxer, and the flux material is mixed inside the fluxer and applied to the printed circuit board. The discharge section of the supply pipe for supplying the flux is a long pipe extending from the flux application section to the flux supply section, and is a fluxer in which a large number of holes are bored in the pipe.

〔Example〕

A supply pipe 5 is introduced into the fluxer 1 and connected to a stock solution tank and a diluent tank. Supply pipe 5
The discharge section is a long pipe 10 extending from the flux supply section 8 to the flux application section 7, and a large number of holes 11 are bored in the pipe.

Here, the supply of flux material in the fluxer of the present invention will be explained.

When the sensor 6 detects a change in flux concentration and instructs the supply of flux stock solution or diluent, a valve for sucking out the necessary material is opened, and the necessary material is sent by a pump. The necessary materials flow into the fluxer through a large number of holes 11 bored in a long pipe 10, which is the discharge part of the supply pipe. At this time, since the pipe 10 is long and curved from the flux application section 7 to the flux material supply section 8, the flux material flows into both simultaneously, and the flux in the fluxer instantly becomes uniform in composition.

[Effect of idea]

With this invention, the flux in the area where flux is actually applied is in the most suitable state for soldering, as instructed by the sensor, so that reliable soldering can be performed.

[Brief explanation of the drawing]

Figure 1 is a front sectional view of the fluxer of the present invention, Figure 2
The figure is a sectional view taken along the line A-A, and FIG. 3 is a front sectional view of the conventional fluxer. 1... Fluxer, 2... Flux stock solution tank, 3... Diluent, 5... Supply pipe, 6... Sensor, 7... Flux application section, 8... Flux supply section, 10... Pipe, 11 ...hole.

Claims (1)

[Scope of utility model registration request] The discharge part of the supply pipe that supplies the flux material into the fluxer in a fluxer that supplies flux materials such as flux undiluted solution or diluent into the fluxer according to a command from a sensor in the fluxer, mixes it in the fluxer, and applies it to a printed circuit board. A fluxer characterized in that it is a long pipe extending from a flux application section to a flux supply section, and that the pipe has a large number of holes.