CN201312432Y

CN201312432Y - Fixed kettle opening of kettle spout

Info

Publication number: CN201312432Y
Application number: CN 200820216471
Authority: CN
Inventors: 庄春明
Original assignee: Suzhou Mingfu Automation Equipment Co Ltd
Current assignee: Suzhou Mingfu Automation Equipment Co Ltd
Priority date: 2008-11-25
Filing date: 2008-11-25
Publication date: 2009-09-16
Anticipated expiration: 2018-11-25

Abstract

The utility model relates to a tin stove part for soldering PCBA board, in particular to a fixed kettle opening of kettle spout. The opening portion of the kettle spout is provided with a cylindrical socket, at least one tin-spilling opening is provided on the edge of the cylindrical socket, and each tin-spilling opening is a rectangular cut with a depth of 3 to 6mm, a tin-spilling inclined surface is provided at each tin-spilling opening, a base is provided on the bottom of the cylindrical socket, and a kettle spout fixing hole is provided on the base. The utility model with a simple structure is capable of effectively improving soldering efficiency and adaptable to large-scale automatic production. The utility model can effectively prevent oxide layer on the surface layer of tin liquids from remaining on the surface of PCBA board, thereby guaranteeing the quality of soldering joints.

Description

Fixed kettle mouth

Technical field

The utility model relates to a kind of tin stove parts of the PCBA of being used for boards solder, especially a kind of fixed kettle mouth.

Background technology

Common wave-soldering adopts manual operations usually, and production efficiency is lower, for the comparatively intensive PCBA plate of need pad, this welding manner is more inadequate, in addition, because stannum export too small (generally long 2 millimeters), can bring the obstruction of scruff, thereby cause the large tracts of land of rosin joint to produce Hu Kou; At the comparatively intensive PCBA plate of pad, the kettle of employing mouth structure is also arranged, but common tin furnace kettle mouth is flat mouthful design, in order to realize scolding tin operation to the PCBA plate, generally need maintenance distance once between PCBA plate and kettle mouth, guarantee to make tin liquor can the electric elements on the PCBA plate of top be welded on the one hand from the Hu Kou ejection, guarantee simultaneously can in time discharge Hu Kou from the tin liquor of Hu Kou ejection subsequently, prevent that the kettle mouth pressure is excessive, influence welding quality, but also there is fault of construction in this structure: when tin liquor when Hu Kou sprays, because the tin liquor of upper space is owing to directly contact the formation oxide layer with air, this part oxide layer at first contacts with the PCBA plate of top along with tin liquor is gushed out from Hu Kou, in the wings under the frontal impact of tin liquor, make this part oxide layer oppressed on PCBA plate face, be difficult for it being taken away, make oxide layer remain between solder joint and the PCBA plate, have a strong impact on welding quality by the kettle mouth tin liquor of gushing out subsequently.In addition, when usually some being had the welding of PBCA plate electronic devices and components of connector, often be not easy to the position of Hu Kou is fixed, thereby influence welding effect.

Summary of the invention

In order to overcome the deficiency that above-mentioned various scolding tin exists, when especially adopting the intensive PCBA plate of the point-to-point wave-soldering butt welding point of automatic selectivity to weld, inefficiency, be unsuitable for extensive batch machining, and contact easily forms the deficiency of rosin joint, it is a kind of simple in structure that the utility model provides, and can effectively improve welding efficiency, guarantees the tin furnace kettle mouth of the quality of welded contact.

The technical scheme that its technical problem that solves the utility model adopts is: a kind of fixed kettle mouth, the oral area of described Hu Kou is provided with the cylindricality socket, be provided with at least one excessive Xi Kou at the edge of cylindricality socket, bottom at the cylindricality socket is provided with base, and base is provided with kettle mouth fixing hole.

For the ease of the processing of the Xi Kou that overflows, guarantee the tin liquor Xi Kou outflow of can overflowing equably simultaneously, further: described excessive Xi Kou is a rectangle gap.

For the degree of depth of the Xi Kou that overflows rationally is set, cross shallow may rising and come the Xi Kou that overflows excessive tin effect should be arranged, cross may cause deeply tin liquor before the kettle mouth of emerging just from the Xi Kou outflow of overflowing, make the emerge height of Hu Kou of tin ripple on the low side, influence welding quality, more further: the degree of depth of described excessive Xi Kou is 3～6mm.

For the ease of overflowing of tin liquor, one go on foot ground again: described excessive Xi Kou is provided with and helps the excessive tin inclined-plane that tin liquor is overflowed.

The existence of excessive Xi Kou can effectively change the flow direction of tin liquor behind ejection Hu Kou.After tin liquor sprays from Hu Kou, tin liquor can preferentially flow out from the Xi Kou that overflows, so just form certain tin stream that flows to, making the oxide layer of the superiors can directly do not impacted is adsorbed onto on the PCBA plate, even there is the partial oxidation layer to be adsorbed onto on the PCBA plate, can be washed away by the tin liquor that sprays from Hu Kou subsequently, having guaranteed can residual oxide layer not influence the soldering quality between scolding tin and PCBA plate yet; On the other hand, because surface tension, tin liquor upper surface in the kettle mouth is spherical shape, make under the not high situation of furnace pressure, may appear at kettle mouth edge and form rosin joint, influence welding quality, the existence of excessive Xi Kou, change the flow direction of kettle mouth tin liquor, made tin liquor can maximum possible cover the PCBA plate of kettle mouth top, guaranteed the adequacy and the fastness of welding.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the utility model kettle mouth structure schematic diagram.

Fig. 2 is the placement location schematic diagram of the utility model on the PCBA plate.

1. cylindricality sockets, 2. excessive tin mouth 3. bases 4. kettle mouth fixing holes, 5. excessive tin inclined-planes, 6. electronic devices and components 7.PCBA plates among the figure

Embodiment

A kind of fixed kettle mouth as shown in Figure 1, the oral area of described Hu Kou is provided with cylindricality socket 1, is provided with at least one excessive tin mouth 2 at the edge of cylindricality socket 1, and described excessive tin mouth 2 is a rectangle gap, its degree of depth is 3～6mm, and is provided with the tin inclined-plane 5 that overflows at excessive tin mouth 2.Be provided with base 3 in the bottom of cylindricality socket 1, base 3 is provided with kettle mouth fixing hole 4.

As shown in Figure 2, before welding, base 5 is fixedlyed connected by kettle mouth fixing hole 4 with the stannum export of tin stove, what overflow tin mouth 2 offers the distribution situation decision of position according to the electronic devices and components 6 in the kettle mouth outside, usually on the PCBA plate 7 in the outside of the tin mouth 2 that overflows no electronic devices and components 6 or from far away relatively, the tin liquor that flows out from the tin mouth 2 that overflows can not be spread and excessive Xi Kou other electronic devices and components 6 on every side on.

During use, the PCBA plate is placed on the precalculated position of kettle mouth top, and board plane and kettle mouth stannum export are maintained a certain distance, generally be controlled at 2～4mm.The shape of Hu Kou can determine that Hu Kou is designed to rectangular shape usually according to the distribution situation of PCBA plate welding position, and its length is 6～11mm.For the welding position is irregular concentrated distribution, can adopt a plurality of rectangle Hu Kou to piece together required welding shape.Tin liquor keeps earlier certain liquid level to store in the kettle mouth 1～3 minute, the PCBA plate to be welded of top is carried out preheating, so that preceding operation is removed the oxide layer on the PCBA plate at the scaling powder generation chemical reaction of PCBA plate position to be welded spraying.Afterwards, the electronic startup of tin stove, push to Hu Kou by the tin liquor of exerting pressure the tin furnace interior, the continuous lifting of tin liquor face in the kettle mouth, and tin liquor ejects kettle mouth stannum export the most at last, contacts with the PCBA plate of top and welds, and is guaranteeing that tin liquor and PCBA plate fully weld, unnecessary tin liquor can be discharged from the Xi Kou that overflows, and takes away the oxide layer and the impurity of tin liquor top layer.At last, take off the PCBA plate, finish the welding of ground PCBA plate from kettle mouth top.

Because adopted kettle mouth method for designing flexibly, enlarged effective solder side, thereby made speed of welding fast on year-on-year basis more than three times with international " automatic selectivity welding tin stove ".

Because Hu Kou has adopted excessive tin mouth design, this scheme has just been removed the main scruff of welding quality and the oxide skin on tin liquor surface of influencing before welding, the qualification rate of welding is reached more than 99.9%.

Claims

1. fixed kettle mouth, it is characterized in that: the oral area of described Hu Kou is provided with cylindricality socket (1), be provided with at least one excessive Xi Kou (2) at the edge of cylindricality socket (1), be provided with base (3) in the bottom of cylindricality socket (1), base (3) is provided with kettle mouth fixing hole (4).

2. fixed kettle mouth according to claim 1 is characterized in that: described excessive Xi Kou (2) is a rectangle gap.

3. fixed kettle mouth according to claim 2 is characterized in that: the degree of depth of described excessive Xi Kou (2) is 3～6mm.

4. fixed kettle mouth according to claim 2 is characterized in that: described excessive Xi Kou (2) is provided with and helps the excessive tin inclined-plane (5) that tin liquor is overflowed.