CN1039696A

CN1039696A - Welder

Info

Publication number: CN1039696A
Application number: CN 88106012
Authority: CN
Inventors: 近藤权士
Original assignee: Nihon Den Netsu Keiki Co Ltd
Current assignee: Nihon Den Netsu Keiki Co Ltd
Priority date: 1988-07-21
Filing date: 1988-07-21
Publication date: 1990-02-14
Anticipated expiration: 2003-07-21
Also published as: CN1021877C

Abstract

A kind of welder, the heating chamber by in it heats printed circuit board (PCB), and temporary fixed the chip component that has soldering paste makes the soldering paste soft heat by above-mentioned heating process on this printed circuit board (PCB).Heating chamber is separated into one or several preheating chambers and a soft heat chamber.Simultaneously, each preheating chamber is divided into gas channel and central space district, and printed circuit board (PCB) is transferred through the central space district.In the central space district, be provided with heater, air-flow control rake and a soft heat chamber.Simultaneously, each preheating chamber is divided into gas channel and central space district, and printed circuit board (PCB) is transferred through the central space district.In the central space district, be provided with heater, air flow control panel and fan, cause the indoor heater heats of each preheating hot-air in each indoor forced circulation that obtains, thereby make printed circuit board (PCB) be able to even heating.

Description

Welder

The present invention relates to a kind of device that is used to weld printed circuit board (PCB).More particularly, be a kind of like this welder, portion heats printed circuit board (PCB) with hot-air within it, and the electronic component of temporary fixed band tin biscuit or soldering paste on the printed circuit board (PCB) makes biscuit fusing or soft heat through heating.

Fig. 4 shows a kind of above-mentioned known welder briefly.Among the figure, label 1 expression printed circuit board (PCB) has on plate 1 with the temporary fixed chip component 2 of soldering paste 3.Make it pass through the inside of shell 4 along the conveying of the direction shown in the arrow A plate 1 with conveyer belt.The inboard of shell 4 is separated into heating chamber 6 and cooling chamber 7 by dividing plate 4a.The heater 8 of configuration sealing is used for the air in the heating chamber in heating chamber 6.The fan 10 that is provided with is delivered to warmed-up air on the printed circuit board (PCB) 1 of just advancing by heating chamber 6.There is infrared radiation lamp 9 in place near import in chamber 6, is used for heating printed circuit board (PCB) 1.In heating chamber 6, plate 1 is heated to the temperature that is enough to make soldering paste 3 fusings or soft heat.Then, the plate 1 that has fusion scolding tin is sent to cooling chamber 7, in cooling chamber 7, utilize cooling fan to make its cooling, cause the scolding tin of fusion to solidify, chip component 2 is welded on the plate 1 securely.

Use above-mentioned welder,, therefore, when the size of printed circuit board (PCB) 1 is very big, the welding accident will occur owing to the inhomogeneous printed circuit board (PCB) 1 that makes of hot air flow in the heating chamber can not get even heating.If take certain measure, for example carry plate 1 to increase the residence time of plate 1 in heating chamber 6 lentamente by heating chamber 6, can eliminate above-mentioned welding accident like this.Yet the increase of residence time certainly will cause the pyrolytic damage of the chip component 2 on the plate 1.

The present invention is exactly the problem that will solve the above-mentioned traditional required solution of welder, and provide a kind of device that is used to weld printed circuit board (PCB), on soldered printed circuit board (PCB), be equipped with the tin biscuit temporary fixed electronic component, this welder comprises:

The case member of a longitudinal extension,

Conveying device, this conveying device provide a path, along this path and according to the vertical conveying printed circuit board (PCB) that is parallel to said case member, make it pass through said case member,

The baffle plate device of one or more extending transverselies, this baffle plate device is arranged in the said case member, so that inner space is separated into a soft heat chamber and one or more preheating chamber of vertical arrangement, putting in order of they is such, direct of travel with respect to the printed circuit board (PCB) that passes through said case member, said soft heat chamber is set at the downstream of said one or more preheating chambers

On each of one or more baffle plate devices opening is set, printed circuit board (PCB) can pass through from these openings,

The vertical partition plate of a pair of longitudinal extension that is separated from each other, this is arranged on dividing plate in each of said one or more preheating chambers, and preheating chamber is separated into two parts: as outside and central space part of gas channel;

On each said vertical partition plate, upper and lower opening is set, thereby makes the gas channel of each chamber and corresponding central space keep unimpeded,

First heater that in each central space of said one or more preheating chambers, is disposed, be used for heating the air of said central space, the air preheat that causes printed circuit board (PCB) in by said one or more preheating chambers, to be heated

At indoor second heater that disposes of said soft heat, when printed circuit board (PCB) during by the soft heat chamber, second heater makes the soldering paste soft heat on the printed circuit board (PCB),

The fan assembly that in each central space of said one or more preheating chambers, is provided with, so that said indoor air is circulated in said central space and said gas channel, and

Air flow control panel, these air flow control panels are arranged in each central space of said one or more preheating chambers, and between fan and printed circuit board (PCB) carrying path, control flowing of circulating air by said central space with this, so that heat printed circuit board (PCB) equably.

Below, with reference to accompanying drawing the present invention is described in detail.

Fig. 1 is a longitudinal sectional view, has schematically illustrated an embodiment of welder of the present invention.

Fig. 2 is the cutaway view of having done according to the cutting plane II-II in Fig. 1.

Fig. 3 is the cutaway view of having done according to the cutting plane III-III in Fig. 1.And

Fig. 4 is same as in figure 1, also is cutaway view, represents a kind of traditional welder.

Referring now to accompanying drawing 1 to 3,, label 20 represents that all the cross section is the case member of rectangular longitudinal extension.Printed circuit board (PCB) 1 passes through case member 20 along predetermined carrying path by the direction shown in the arrow A.Have on the plate 1 with tin biscuit or soldering paste 3 temporary fixed electronic component or chip component 2.Used conveying device is for example conveyer belt or chain conveyor 5.By one or more dividing plates (shown in the special case is two dividing plates) 21a and 21b case member 20 is divided into a soft heat chamber 22 and one or more (being two in the special case) preheating chamber 23a and 23b.With regard to the throughput direction of printed circuit board (PCB), soft heat chamber 22 is positioned at the downstream of preheating chamber 23a and 23b.In listed examples, cooling chamber 24 is also limited by the dividing plates 25 in the case member 20 and in the downstream of soft heat chamber 22.Case member 20, dividing plate 21a and 21b and dividing plate 25 are provided with

suitable openings

31a, 31b, 32a, 32b and 33, and these openings can make printed circuit board (PCB) 1 pass through, thereby make printed circuit board (PCB) 1 can pass through case member 20.

See the most clearly by Fig. 2, a pair of that separate each other, vertical, axially extended dividing plate 26a is arranged in preheating chamber 23, dividing plate 26a is chamber 23a separated into two parts: the outside and the central space 28a that are used as gas channel 27a.Each dividing plate 26a is provided with upper shed 29a and under shed 30a, thereby, make gas channel 27a and central space 28a keep unimpeded by upper shed 29a and under shed 30a.In central space 28a, have fan 34a.Fan 34a running makes the air in the preheating chamber 23a circulate along the direction shown in the arrow B among Fig. 2, and air enters gas channel 27a from central space 28a by under shed 30a, enters central space 28a by upper shed 29a then.Air flow control panel 35a is set in the central space 28a of preheating chamber 23a, and makes air flow control panel 35a between fan 34a and conveyer belt 5.Best, these air flow control panels 35a vertically separate, horizontal expansion and bending downwards, and these air flow control panels 35a is fixed by dividing plate 26a.Can suitably select quantity, structure, the orientation of control board, so that obtain optimum efficiency.

Among the preheating chamber 23b, preferably also have in the soft heat chamber 22 to be respectively equipped with dividing

plate

26b, 26c,

fan

34b, 34c, and air flow control panel 35b, 35c.Upper shed 29b and 30b, under shed 29c and 30c are arranged respectively on dividing plate 26b and the 26c.These parts are similar to those corresponding parts among the preheating chamber 23a, give unnecessary details no longer one by one at this.

First heater, electric heater for example, preferably closed

heater

36a and 36b, they are separately positioned among central space 28a and the 28b, are used for heating air wherein.Thereby, the air preheat that printed circuit board (PCB) 1 just has been heated by preheating chamber 23a and 23b the time.In order to reduce warm-up time, the most handy assisted heating device.Preferably in preheating chamber 23a, hot UV radiation lamp 37 far away is set near opening 31a place.Label 38 is the reflecting plates that increase lamp 37 efficient.

Second heater is set among the central space 28c of soft heat chamber 22, and second heater preferably has the far-infrared radiation lamp 39 of reflecting plate 40, and when printed circuit board (PCB) during by soft heat chamber 22, second heater makes soldering paste 3 fusing or soft heats.If desired, can the auxiliary air heater be set in soft heat chamber 22, for example be similar to the such closed heater of

heater

36a and 36b, to quicken softening-melting process.

The operation of above-mentioned welder is as described below.At first, the temperature among the preheating chamber 23a of front and the follow-up preheating chamber 23b remains on about 160 ℃ and 140 ℃ respectively.The printed circuit board (PCB) 1 that has chip component 2 at first is introduced into preheating chamber 23a by import 31a, and the air heat that has been heated at this indoor plate 1 is to about 140 ℃, and warmed-up air is driven by fan 34a, and it is circulated by central space 28a.Because warmed-up air approximately is 160 ℃ in the 23a of chamber, thereby in the relatively shorter time, plate 1 can be heated to about 140 ℃.

Then, plate 1 is transported to follow-up preheating chamber 23b by hole 32a, and in preheating chamber 23b, plate 1 contacts with about 140 ℃ hot-air.This operation is enough to realize the fine adjusting of plate 1 temperature, and makes the temperature change of plate 1 reach minimum value.Usually need finish the preheating in chamber 23a and 23b about 60～80 seconds.Then, preheating plate 1 through port 32b be sent in the soft heat chamber 22, in soft heat chamber 22, plate 1 heat (usually 215 ℃ down 15～20 seconds of heating) rapidly with lamp 39, cause soldering paste or tin biscuit to melt.Thereafter, plate 1 is sent soft heat chamber 22, and through port 33 is sent into cooling chamber 24, in cooling chamber 24, utilizes cooling fan 41 to make plate 1 cooling, the scolding tin of fusing is solidified, thereby element 2 and plate 1 are welded together securely.At last, plate 1 takes out from case member 20 by outlet 31b.

Thereby according to welder of the present invention, owing to be provided with one or morely in the upstream of soft heat chamber 22, preferably two preheating chamber 23a and 23b therefore can be with fully heating and can not make the chip component that is installed on the plate 1 be subjected to pyrolytic damage of plate 1.In addition, because preheating chamber 23a and 23b, if required, also have the air of soft heat chamber 22 to be forced to circulation, simultaneously also because on the transfer passage of plate 1, be provided with air

flow control panel

35a, 35b and 35c, so each indoor hot air flow evenly distributes, so that whole printed circuit board (PCB) 1 can evenly be heated.

Claims

1, a kind of device that is used to weld printed circuit board (PCB), have on the soldered printed circuit board (PCB) with the tin biscuit temporary fixed electronic component, this device comprises:

The case member of a longitudinal extension,

The baffle plate device of one or more extending transverselies, this baffle plate device is arranged in the said case member, so that inner space is separated into a soft heat chamber and one or more preheating chamber of vertical arrangement, putting in order of they is such: with respect to the direct of travel of the printed circuit board (PCB) that passes through said case member, said soft heat chamber is set at the downstream of said one or more preheating chambers

The vertical partition plate of a pair of longitudinal extension that is separated from each other, this is arranged on dividing plate in each of said one or more preheating chambers, and preheating chamber is separated into two parts: as outside and central space part of gas channel,

Air flow control panel, these air flow control panels are arranged in each the central space of said one or more preheating chambers, and between fan and printed circuit board (PCB) carrying path, control flowing of circulating air by said central space with this, so that heat printed circuit board (PCB) equably.

2, according to the said device of claim 1, comprise that further one is positioned at downstream, said soft heat chamber and the cooling chamber that is adjacent and a cooling fan that is arranged on said cooling chamber, the path of printed circuit board (PCB) is through said cooling chamber, when printed circuit board (PCB) during by said cooling chamber just by said fan cooled.

3, according to the said device of claim 1, wherein, said first heater comprises one or more electric heaters.

4,, further be included in an auxiliary heater of settling in the upstream extremity preheating chamber, to quicken heating to printed circuit board (PCB) according to the said device of claim 1.

5, according to the said device of claim 4, wherein, said auxiliary heater comprises one or more far-infrared radiation lamps.

6, according to the said device of claim 1, wherein, said second heater comprises one or more far-infrared radiation lamps.

7, according to the said device of claim 1, further comprise:

Another vertical partition plate that branch is arranged at the indoor longitudinal extension of said soft heat, this dividing plate is separated into two parts to the soft heat chamber: as Outboard Sections and central space part of gas channel, said second heater is arranged in the central space of said soft heat chamber

Said another to vertical partition plate on set upper and lower opening, thereby make the central space of the gas channel of said soft heat chamber and said soft heat chamber keep unimpeded,

Second fan assembly that is provided with in the central space of said soft heat chamber circulates the indoor air of said soft heat in the central in the gas channel of space and said soft heat chamber, and,

Set air flow control panel in the central space of said soft heat chamber and between second fan assembly and printed circuit board (PCB) carrying path is used for controlling flowing of said soft heat chamber central space air, so that heat printed circuit board (PCB) equably.

8, according to the said device of claim 7, further be included in the auxiliary heater of the indoor setting of said soft heat, be used to heat the indoor air of soft heat.

9, according to the said device of claim 1, wherein, air flow control panel vertically separate, in horizontal expansion, and fix by said a pair of vertical partition plate.