阅读说明：本技术 一种印刷线路板引脚焊接辅助装置 (Printed circuit board pin welding auxiliary device ) 是由 于浩 于 2021-07-22 设计创作，主要内容包括：本发明公开一种印刷线路板引脚焊接辅助装置,属于线路板引脚焊接技术领域,包括外套筒和内挡筒；外套筒呈倒置漏斗状,其小口端与引脚套箍匹配；内挡筒下部支撑于线路板的引脚孔上沿。锡液在波峰焊过程中通过引脚与引脚孔间隙向上流动,通过内挡筒与引脚孔上沿贴合,可阻挡向上溢流的锡液,保证焊接质量；并配合外套筒下端与线路板上表面贴合,有效防止污染物向线路板上表面四周蔓延、散落；并通过外套筒小口端与引脚箍紧,以阻挡污染物沿引脚上移,避免污染物进入到零部件内部,保证焊接质量和焊接的安全性；整体结构简单,造价低廉,实现容易,实用性好。(The invention discloses a printed circuit board pin welding auxiliary device, which belongs to the technical field of circuit board pin welding and comprises an outer sleeve and an inner blocking sleeve; the outer sleeve is in an inverted funnel shape, and the small-opening end of the outer sleeve is matched with the pin hoop; the lower part of the inner blocking cylinder is supported on the upper edge of the pin hole of the circuit board. The tin liquid flows upwards through the gap between the pin and the pin hole in the wave soldering process, and can block the tin liquid overflowing upwards through the fit of the inner blocking cylinder and the upper edge of the pin hole, so that the soldering quality is ensured; the lower end of the outer sleeve is matched with the upper surface of the circuit board, so that pollutants are effectively prevented from spreading and scattering around the upper surface of the circuit board; the small opening end of the outer sleeve is hooped with the pin to prevent pollutants from moving upwards along the pin, so that the pollutants are prevented from entering parts, and the welding quality and the welding safety are ensured; the whole structure is simple, the manufacturing cost is low, the realization is easy, and the practicability is good.)

1. The auxiliary device for welding the pins of the printed circuit board is characterized by comprising an outer sleeve (1) and an inner blocking cylinder (2), wherein the inner blocking cylinder (2) is vertically and slidably arranged inside the outer sleeve (1); the outer sleeve (1) is in an inverted funnel shape, and the small opening end of the outer sleeve is matched with the ferrule of the pin (4); the lower part of the inner retaining cylinder (2) is of a funnel-shaped structure, and the outer conical surface of the funnel-shaped structure is supported on the upper edge of a pin hole (31) of the circuit board (3).

2. The auxiliary device for welding pins of printed circuit board according to claim 1, wherein the lower end of the inner barrel (2) extends into the pin hole (31) and is located between one third bisector and one half bisector of the upper end of the pin hole (31).

3. The auxiliary device for welding the pins of the printed circuit board according to claim 1, wherein a gap is left between the lower end of the inner cylinder (2) and the pins (4).

4. The auxiliary device for welding the pins of the printed circuit board according to claim 1, wherein the outer sleeve (1) is provided with a vertical guide groove (11) and a horizontal locking groove (12), and the lower end of the guide groove (11) is communicated with one end of the locking groove (12); an operating rod (21) is arranged on the upper side of the inner retaining cylinder (2), and the operating rod (21) is guided by the guide groove (11) and is locked and limited by the locking groove (12).

5. Printed wiring board pin soldering aid according to claim 4, characterized in that the guide slots (11) and the locking slots (12) are arranged in two groups and symmetrically on the outer sleeve (1).

6. Printed wiring board pin soldering aid according to claim 4, characterized in that the operating lever (21) is detachably plug-mounted with the inner barrel (2).

7. The auxiliary device for welding the pins of the printed circuit board according to claim 1, wherein the outer sleeve (1) comprises a skeleton made of polyimide and a protective layer made of silicon rubber and wrapping the outer side of the skeleton.

8. Printed wiring board pin soldering aid according to claim 3, characterized in that the outer sleeve (1) is coated inside with an adsorption layer (5).

9. The auxiliary device for welding the pins of the printed circuit board according to claim 8, wherein the upper part of the inner barrel (2) is in an inverted funnel shape; the inner blocking cylinder (2) is provided with a plurality of through holes (22).

10. Printed wiring board pin soldering aid according to claim 1, characterized in that the lower end of the outer sleeve (1) is bent inwards with a collar (13).

Technical Field

The invention belongs to the technical field of circuit board pin welding, and particularly relates to an auxiliary device for welding pins of a printed circuit board.

Background

With the development of high technology, the functions and performances of electronic products need to be improved, the printed circuit board is developed more and more in a tiny and fine direction due to the highly integrated process requirement, and the surface process technology of the device has increasingly harsh requirements.

The plug-in components need to adopt a wave soldering process, and wave soldering achieves the purpose of soldering due to the particularity of the process, namely the wave soldering is realized by directly contacting the soldering surface of the printed circuit board with high-temperature liquid tin, the high-temperature liquid tin keeps an inclined surface, and the liquid tin forms a wave-like shape by a special device, so that a certain impact force is exerted on the printed circuit board.

In wave soldering, some contaminants often enter the front surface of the printed circuit board through the pin holes of the printed circuit board or enter the inside of the component body along the pins of the component, so that the printed circuit board is polluted and corroded, the printed circuit board fails, or the soldered component fails.

In the field of servers, the printed circuit board is thicker due to more complex design and more board card layers, so that pins of plug-in components of the servers are longer than those of components in the fields of personal computers, industrial computers and the like, and the welding effect is poor; therefore, the plug-in components in the server field are soldered by using a large amount of soldering flux for auxiliary soldering, wherein the soldering flux can be directly put into the tin liquid in the wave soldering process or uniformly coated on the back surface of the printed circuit board, namely the surface contacted with the tin liquid.

Some volatile matters in the soldering flux for wave soldering are volatile in high-temperature wave soldering liquid to form a gas state or a liquid state, so that the soldering pollutants can enter the front surface of the printed circuit board along pin holes of the printed circuit board or enter the part body along pins of the part, and the part is caused to lose efficacy. The pollutants on the front surface of the printed circuit board can be scattered to any position on the front surface of the printed circuit board, so that the risks of circuit short circuit and corrosion exist, the use function of the printed circuit board is abnormal, and the welding pollutants are attached to the pins of the parts for a long time, so that the pins of the parts are polluted and corroded, and the use function of the parts is abnormal.

Disclosure of Invention

The problem that some volatile matters in the existing wave soldering flux are easy to volatilize in high-temperature wave soldering liquid to form a gas state or a liquid state so as to form the soldering pollutants, and the soldering pollutants enter the front surface of the printed circuit board along pin holes of the printed circuit board or enter the body of parts along pins of the parts to cause the parts to lose efficacy is solved; the invention provides a printed circuit board pin welding auxiliary device, which solves the problems that pollutants on the front surface of a printed circuit board can be scattered to any position on the front surface of the printed circuit board, the risks of circuit short circuit and corrosion exist, the use function of the printed circuit board is abnormal, welding pollutants are attached to pins of parts for a long time, the pins of the parts are polluted and corroded, and the use function of the parts is abnormal.

The invention is realized by the following technical scheme.

A printed circuit board pin welding auxiliary device comprises an outer sleeve and an inner blocking cylinder, wherein the inner blocking cylinder is vertically and slidably arranged inside the outer sleeve; the outer sleeve is in an inverted funnel shape, and a small-opening end of the outer sleeve is matched with the pin hoop; the lower part of the inner blocking cylinder is of a funnel-shaped structure, and the outer conical surface of the funnel-shaped structure is supported on the upper edge of the pin hole of the circuit board. When wave soldering is carried out on pins of parts, the pins sequentially penetrate through the device and pin holes in the circuit board from top to bottom, so that the inner blocking cylinder and the outer sleeve are sleeved outside the pins, the small opening end at the upper part of the outer sleeve is tightly hooped with the outside of the pins without a gap, and the end face of the large opening end at the lower part of the outer sleeve is attached to the upper surface of the circuit board; the length of the pins extending out of the lower ends of the pin holes downwards is adjusted, the inner blocking cylinder slides downwards relative to the outer sleeve, and the middle part of the outer conical surface of the funnel-shaped structure at the lower part of the inner blocking cylinder is tightly pressed and attached to the upper edges of the pin holes; performing wave soldering on the pins protruding from the lower surface of the circuit board by using a wave soldering machine, wherein high-temperature tin liquid flows and diffuses upwards through gaps between the pins and pin holes in the wave soldering process; because the outer conical surface of the funnel-shaped structure at the lower part of the inner blocking cylinder is attached to the upper edge of the pin hole, the upward overflow of molten tin can be effectively blocked, and the quality of wave soldering is ensured; the lower end of the outer sleeve is matched with the upper surface of the circuit board, so that welding pollutants are effectively prevented from spreading and scattering to the periphery of the upper surface of the circuit board, and the circuit short circuit and corrosion risks of the circuit board are avoided; the small opening end of the upper part of the outer sleeve is tightly hooped and sealed with the outer ring of the pin, so that welding pollutants can be effectively prevented from moving upwards along the pin, and the problem that the welding pollutants move upwards and enter the inside of parts to cause damage and failure of the parts is avoided; wave soldering quality and soldering safety of the pins of the circuit board are effectively guaranteed; the auxiliary device for welding the pins of the printed circuit board has the advantages of simple overall structure, low manufacturing cost, easy realization, simple use and good practicability.

The invention is further improved in that the lower end of the inner retaining cylinder extends into the pin hole and is positioned between one third equal division point and one half equal division point at the upper end of the pin hole. Through the control of the lower end position of the inner blocking cylinder, the lower end of the inner blocking cylinder stops the overflowing tin liquid, so that the overflowing height of the tin liquid is effectively controlled, namely the overflowing height of the tin liquid is controlled between one third equal division point and one half equal division point at the upper end of the pin hole, the firm welding effect on the pin of the part can be guaranteed, the phenomenon that the tin liquid excessively moves upwards to overflow can be effectively avoided, the welding quality is guaranteed, the quantitative using amount of the tin liquid is controlled, and the problem of resource waste of the tin liquid caused by excessive overflowing of the tin liquid is avoided.

In addition, a gap is reserved between the lower end of the inner retaining cylinder and the pin. The clearance between interior fender section of thick bamboo lower extreme and the pin can be regarded as tin liquid and pass through the exhaust passage of pin hole overflow from the circuit board lower surface, and reserves the ascending passageway for the welding pollutant, when wave soldering, avoids tin liquid overflow to form high-pressure space in the pin hole, guarantees good solid effect of welding.

The invention is further improved in that the outer sleeve is provided with a vertical guide groove and a horizontal locking groove, and the lower end of the guide groove is communicated with one end of the locking groove; an operating rod is arranged on the upper side of the inner blocking cylinder, and the operating rod is guided by the guide groove and is limited by the locking of the locking groove. The operating rod is vertically slidably guided through the guide groove, so that the inner blocking cylinder can be vertically slidably adjusted in the outer sleeve; when the operating rod is locked and clamped through the horizontal locking groove, the outer conical surface of the funnel-shaped structure at the lower part of the inner blocking cylinder is tightly attached to the upper edge of the pin hole, so that the locking of the inner blocking cylinder and the pin hole along the attachment can be realized, and pollutants are effectively prevented from being scattered.

In a further development of the invention, the guide grooves and the locking grooves are arranged in two groups and symmetrically arranged on the outer sleeve. Through the guide way and the locking groove that centrosymmetry set up, can guarantee the stationarity of guide way to the vertical direction of action bars and the atress equilibrium of locking groove to the horizontal locking of action bars.

The invention further improves that the operating rod and the inner retaining cylinder are detachably inserted and installed. The inner blocking cylinder, the outer sleeve and the operating rod are more convenient to assemble and disassemble, easy to realize and good in practicability.

The invention is further improved in that the outer sleeve comprises a polyimide framework and a silicon rubber protective layer wrapping the outer side of the framework. The polyimide material is used as the framework of the outer sleeve, has good insulating and antistatic properties and higher thermal stability, and can effectively prevent static electricity, resist heat and support a good structure when used as the framework; the silicon rubber material can keep better elastic performance in a high-temperature environment and has good electrical insulation performance, the silicon rubber material can effectively ensure the tightness between the small opening end at the upper part of the outer sleeve and the pin hoop and the tightness between the lower end face of the outer sleeve and the upper surface of the circuit board as a protective layer wrapping the outer side of the outer sleeve framework, welding pollutants generated by wave soldering can not be scattered out through the upper end and the lower end of the outer sleeve, a good welding pollutant isolation function is ensured, and pollution and corrosion damage to the circuit board and parts are prevented.

According to a further improvement of the invention, the inner side of the outer sleeve is covered with an adsorption layer. The adsorption layer can be active carbon with a large specific surface area or a functionalized graphene material; the functionalized graphene material has a large specific surface area and excellent magnetic properties, and can effectively adsorb electrons in polar bonds in welding pollutants.

The invention is further improved in that the upper part of the inner retaining cylinder is in an inverted funnel shape; a plurality of through holes are formed in the inner blocking cylinder. The outer side structure of the upper part of the inner retaining cylinder is matched with the inner side structure of the outer sleeve, so that the stroke of up-and-down sliding adjustment of the inner retaining cylinder can be increased, the structure of the printed circuit board pin welding auxiliary device is more compact, the space between the inner retaining cylinder and the pins is effectively reduced, the space between the outer sleeve and the inner retaining cylinder is increased, the content of welding pollutants distributed on the outer rings of the pins is reduced, the welding pollutants are gathered in the space between the outer sleeve and the inner retaining cylinder, and the pollution and corrosion of the pollutants on the pins are effectively reduced; structural design is reasonable, and the practicality is good. The through hole communicates the space outside the pin and the space inside the outer sleeve, and welding pollutants rising from the gap between the lower end of the inner blocking cylinder and the pin are dispersed into the space between the outer sleeve and the inner blocking cylinder through the through hole, so that the concentration of the welding pollutants on the outer ring of the pin can be quickly reduced, and the pollution and corrosion of the welding pollutants on the pin are reduced.

In a further improvement of the invention, the lower end of the outer sleeve is bent inwards to form a ring platform. The bottom surface of the ring platform is attached to the upper surface of the circuit board, so that the attaching and sealing area of the upper surface of the circuit board is increased, the sealing and isolating effect of welding pollutants is improved, the upper surface of the circuit board is completely isolated from the floating welding pollutants, and the pollution and corrosion of the welding pollutants scattered from the space between the inner blocking cylinder and the pins to the upper surface of the circuit board are avoided; the setting of ring platform also can effectively increase the overall structure intensity of outer sleeve, improves its structural stability.

According to the technical scheme, the invention has the beneficial effects that: when wave soldering is carried out on pins of parts, the pins sequentially penetrate through the device and pin holes in the circuit board from top to bottom, so that the inner blocking cylinder and the outer sleeve are sleeved outside the pins, the small opening end at the upper part of the outer sleeve is tightly hooped with the outside of the pins without a gap, and the end face of the large opening end at the lower part of the outer sleeve is attached to the upper surface of the circuit board; the length of the pins extending out of the lower ends of the pin holes downwards is adjusted, the inner blocking cylinder slides downwards relative to the outer sleeve, and the middle part of the outer conical surface of the funnel-shaped structure at the lower part of the inner blocking cylinder is tightly pressed and attached to the upper edges of the pin holes; performing wave soldering on the pins protruding from the lower surface of the circuit board by using a wave soldering machine, wherein high-temperature tin liquid flows and diffuses upwards through gaps between the pins and pin holes in the wave soldering process; because the outer conical surface of the funnel-shaped structure at the lower part of the inner blocking cylinder is attached to the upper edge of the pin hole, the upward overflow of molten tin can be effectively blocked, and the quality of wave soldering is ensured; the lower end of the outer sleeve is matched with the upper surface of the circuit board, so that welding pollutants are effectively prevented from spreading and scattering to the periphery of the upper surface of the circuit board, and the circuit short circuit and corrosion risks of the circuit board are avoided; the small opening end of the upper part of the outer sleeve is tightly hooped and sealed with the outer ring of the pin, so that welding pollutants can be effectively prevented from moving upwards along the pin, and the problem that the welding pollutants move upwards and enter the inside of parts to cause damage and failure of the parts is avoided; wave soldering quality and soldering safety of the pins of the circuit board are effectively guaranteed; the whole structure is simple, the cost is low, the realization is easy, the use is simple, and the practicability is good.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

Fig. 1 is a schematic structural view of an inner barrier in a vertically adjusted state according to an embodiment of the present invention.

Fig. 2 is a structural schematic diagram of a locked state of the inner drum according to the embodiment of the present invention.

Fig. 3 is a schematic structural diagram of an inner barrier according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a use state of the embodiment of the present invention.

In the drawings: 1. the outer sleeve 11, the guide groove 12, the locking groove 13, the ring table 2, the inner blocking cylinder 21, the operating rod 22, the through hole 3, the circuit board 31, the pin hole 4, the pin 5 and the adsorption layer.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the present embodiment, and it is apparent that the embodiments described below are only a part of embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection of this patent.

As shown in fig. 1-4, the invention discloses an auxiliary device for welding pins of a printed circuit board, which comprises an outer sleeve 1 and an inner blocking cylinder 2, wherein the outer sleeve 1 is made of high-temperature-resistant insulating materials, and the inner blocking cylinder 2 is vertically and slidably arranged inside the outer sleeve 1; the outer sleeve 1 is in an inverted funnel shape with a small upper part and a large lower part, a small opening end at the upper part of the outer sleeve 1 wraps a pin 4 of a wave-soldering part and hoops the pin 4 tightly, and no gap is left between the pin 4 and the pin; the lower part of the inner baffle cylinder 2 is of a funnel-shaped structure with a large upper part and a small lower part, and the outer conical surface of the funnel-shaped structure of the inner baffle cylinder 2 supports and is attached to the upper edge of the pin hole 31 of the circuit board 3.

When wave soldering is carried out on the pins 4 of the parts, the pins 4 sequentially penetrate through the device and the pin holes 31 on the circuit board 3 from top to bottom, so that the inner blocking barrel 2 and the outer sleeve 1 are sleeved outside the pins 4, the small opening end at the upper part of the outer sleeve 1 is tightly hooped with the outer side of the pins 4 without a gap, and the end surface of the large opening end at the lower part of the outer sleeve 1 is attached to the upper surface of the circuit board 3; the length of the pins 4 extending out of the lower ends of the pin holes 31 (namely the lower surface of the circuit board 3) is adjusted, and the inner blocking cylinder 2 slides downwards relative to the outer sleeve 1, so that the middle part of the outer conical surface of the funnel-shaped structure at the lower part of the inner blocking cylinder 2 is tightly pressed and attached to the upper edges of the pin holes 31; performing wave soldering on the pins 4 protruding from the lower surface of the circuit board 3 by using a wave soldering machine, wherein high-temperature tin liquid flows and diffuses upwards through gaps between the pins 4 and the pin holes 31 in the wave soldering process; because the outer conical surface of the funnel-shaped structure at the lower part of the inner baffle cylinder 2 is attached to the upper edge of the pin hole 31, the upward overflow of tin liquid can be effectively prevented, and the quality of wave soldering is ensured; the lower end of the outer sleeve 1 is matched with the upper surface of the circuit board 3 to be attached, so that welding pollutants are effectively prevented from spreading and scattering to the periphery of the upper surface of the circuit board 3, and the circuit short circuit and corrosion risk of the circuit board 3 are avoided; the small opening end on the upper part of the outer sleeve 1 is tightly hooped and sealed with the outer ring of the pin 4, so that welding pollutants can be effectively prevented from moving upwards along the pin 4, and the problem that the welding pollutants move upwards and enter the inside of parts to cause damage and failure of the parts is avoided; wave soldering quality and soldering safety of the pins of the circuit board are effectively guaranteed; the auxiliary device for welding the pins of the printed circuit board has the advantages of simple overall structure, low manufacturing cost, easy realization, simple use and good practicability.

The outer sleeve 1 comprises a polyimide framework and a protective layer, wherein the protective layer is wrapped on the outer side of the framework and is made of silicon rubber. During wave soldering of the pin 4 of the component, the temperature of the tin liquid is about 280 ℃. Polyimide (abbreviated as PI) refers to a polymer having an imide ring (-CO-N-CO-) in the main chain, and is one of organic polymer materials with the best overall performance; the polyimide material has high temperature resistance of more than 400 ℃, long-term use temperature range of-200-300 ℃, no obvious melting point on part, high insulating property, insulation from F level to H level, small elasticity and high strength; polyimide is used as a special engineering material and has been widely applied to the fields of aviation, aerospace, microelectronics, nano-scale, liquid crystal, separation membranes, laser and the like; the polyimide material used as the framework of the outer sleeve 1 has good insulating and antistatic properties and high thermal stability, and can be used as the framework for effectively preventing static electricity, resisting heat and supporting a good structure. By silicone rubber material is meant a rubber having a backbone composed of alternating silicon and oxygen atoms, with the silicon atoms typically having two organic groups attached thereto. Ordinary silicone rubber is mainly composed of silicone segments containing methyl groups and a small amount of vinyl groups; the silicon rubber has high-temperature resistance and low-temperature resistance, can keep good elastic performance in a high-temperature environment, and has good electrical insulation performance, can effectively ensure the tightness of a small opening end at the upper part of the outer sleeve 1 and a ferrule of the pin 4 and the tightness of the fit between the lower end face of the outer sleeve 1 and the upper surface of the circuit board 3 as a protective layer wrapping the outer side of a framework of the outer sleeve 1, ensures that welding pollutants generated by wave soldering cannot be scattered out through the upper end and the lower end of the outer sleeve 1, ensures a good welding pollutant isolation function, and prevents pollution and corrosion damage to the circuit board 3 and parts.

As shown in fig. 4, the lower end of the inner barrier 2 extends into the pin hole 31, and when the outer conical surface of the funnel-shaped structure at the lower part of the inner barrier 2 is attached to the upper edge of the pin hole 31, the lower end of the inner barrier 2 is located between the one-third bisector and the one-half bisector of the upper end of the pin hole 31; generally, when wave soldering is performed on a circuit board pin, the stability and the firmness of the wave soldering can be realized only by ensuring that the overflow height of high-temperature tin liquid in the pin hole 31 is more than half of the height of the pin hole 31, and then the soldering quality can be ensured; and the overflow height of the high-temperature tin liquid in the pin hole 31 is required to be ensured not to be too high so as to prevent the tin liquid from overflowing the upper surface of the circuit board 3 and avoid short circuit and pollution corrosion of circuits on the circuit board 3. Through controlling the lower end position of the inner retaining cylinder 2, the lower end of the inner retaining cylinder 2 stops the overflowing molten tin, so that the overflowing height of the molten tin is effectively controlled, namely the overflowing height of the molten tin is controlled between one third equal division point and one half equal division point at the upper end of the pin hole 31, the firm welding effect on the pin 4 of the part can be guaranteed, the molten tin can be effectively prevented from overflowing upwards, the welding quality and the quantitative consumption of the molten tin are guaranteed, and the problem of resource waste of the molten tin caused by excessive overflowing of the molten tin is avoided.

As shown in fig. 4, a small gap is left between the lower end of the inner sleeve 2 and the pin 4, that is, the inner ring of the lower end of the inner sleeve 2 does not contact with the outer ring of the pin 4. The clearance between 2 lower extremes of interior fender section of thick bamboo and pin 4 can regard as tin liquid to pass through the exhaust passage of pin hole 31 overflow from 3 lower surfaces of circuit boards, and reserves the ascending passageway for the welding pollutant, and when wave soldering, avoid tin liquid overflow to form the high pressure space in pin hole 31, guarantee good solid effect of welding.

As shown in fig. 1-3, the upper part of the outer sleeve 1 is provided with a vertical guide groove 11 and a horizontal locking groove 12, the lower end of the vertical guide groove 11 is communicated with one end of the locking groove 12, i.e. the vertical guide groove 11 and the horizontal locking groove 12 form an L-shaped groove hole; an operating rod 21 is arranged on the outer side of the upper portion of the inner blocking barrel 2, and the operating rod 21 is vertically guided through the guide groove 11 and horizontally locked and limited through the locking groove 12. The operating rod 21 is vertically slidably guided through the guide groove 11, so that the inner blocking cylinder 2 can be vertically slidably adjusted in the outer sleeve 1; when the operating rod 21 is locked and clamped through the horizontal locking groove 12, the outer conical surface of the funnel-shaped structure at the lower part of the inner baffle cylinder 2 is tightly attached to the upper edge of the pin hole 31, so that the locking of the attachment of the upper edges of the inner baffle cylinder 2 and the pin hole 31 can be realized, and pollutants are effectively prevented from being scattered. The two ends of an L-shaped slotted hole formed by the vertical guide groove 11 and the horizontal locking groove 12 are sealed, the limit position of the operating rod 21 can be limited, the operating rod 21 is prevented from sliding out, and the use reliability is high.

In one embodiment, as shown in fig. 1-2, the guide slots 11 and the locking slots 12 are arranged in two sets, and the two sets of guide slots 11 and the locking slots 12 are arranged in a central symmetry on the outer sleeve 1. Through the guide groove 11 and the locking groove 12 which are arranged in the centrosymmetric manner, the stability of the vertical guide of the operation rod 21 by the guide groove 11 and the stress balance of the horizontal locking of the operation rod 21 by the locking groove 12 can be ensured.

In another embodiment, the guide slots 11 and the locking slots 12 are arranged in three or four groups and distributed on the outer sleeve 1 in an annular array; keep off the stationarity of the vertical sliding guide of a section of thick bamboo 2 and horizontal locking in effectively guaranteeing, keep off a section of thick bamboo 2 in the slide adjusting in-process and the slope of horizontal locking state effectively preventing, keep off in guaranteeing that the outer conical surface of 2 lower parts funnel shaped structures of a section of thick bamboo is followed closely laminating completely on pin hole 31, guarantee to effectively keep apart the welding pollutant, prevent that the pollutant from scattering to circuit board 3 upper surface outward.

The operating rod 21 and the inner retaining cylinder 2 are detachably installed in an inserted manner, the cross section of the operating rod 21 is square, and a square slot clamped with the inner end of the operating rod 21 is formed in the outer side surface of the inner retaining cylinder 2; the square slot is not communicated with the inner side of the inner blocking barrel 2, so that the inward insertion limit position of the operating rod 21 can be effectively limited, the operating rod 21 is prevented from rotating, and the accuracy of vertical guiding and horizontal locking of the operating rod 21 is ensured; the inner retaining cylinder 2, the outer sleeve 1 and the operating rod 21 are more convenient to assemble and disassemble, and the practicability is good.

As shown in fig. 4, a ring platform 13 is bent inwards at the lower end of the outer sleeve 1, and the ring platform 13 and the outer sleeve 1 are integrally injection-molded; the interior circle of ring platform 13 along having down with the chamfer face of the outer conical surface laminating of 2 lower parts of interior fender section of thick bamboo, when following the laminating on the outer conical surface of the funnel-shaped structure of 2 lower parts of interior fender section of thick bamboo and pin hole 31, the outer conical surface of the funnel-shaped structure of 2 lower parts of interior fender section of thick bamboo also with the ring platform 13 interior circle along the chamfer face laminate completely and compress tightly, strengthen the sealing performance to the welding pollutants, can effectively improve the stability of 2 locking of interior fender section of thick bamboo, guarantee the reliability of using. The bottom surface of the annular table 13 is attached to the upper surface of the circuit board 3, so that the attaching and sealing area of the upper surface of the circuit board 3 is increased, the sealing and isolating effects of welding pollutants are improved, and meanwhile, the outer conical surface of the funnel-shaped structure at the lower part of the inner baffle cylinder 2 is attached to the chamfered surface at the upper edge of the inner ring of the annular table 13, so that the upper surface of the circuit board 3 is completely isolated from the floating welding pollutants, and the pollution and corrosion of the welding pollutants scattered from the space between the inner baffle cylinder 2 and the pins 4 to the upper surface of the circuit board 3 are avoided; the arrangement of the ring platform 13 can effectively increase the overall structural strength of the outer sleeve 1 and improve the structural stability of the outer sleeve.

As shown in fig. 4, the upper portion of the inner barrel 2 is in an inverted funnel shape, and the structure of the outer side of the upper portion of the inner barrel 2 is matched with the structure of the inner side of the outer sleeve 1, so that the stroke of the inner barrel 2 in up-and-down sliding adjustment can be increased, the structure of the printed circuit board pin welding auxiliary device is more compact, the space between the inner barrel 2 and the pin 4 is effectively reduced, the space between the outer sleeve 1 and the inner barrel 2 is increased, the content of welding pollutants distributed on the outer ring of the pin 4 is reduced, the welding pollutants are gathered in the space between the outer sleeve 1 and the inner barrel 2, and the pollution corrosion of the pollutants on the pin 4 is effectively reduced; structural design is reasonable, and the practicality is good.

Furthermore, the uppermost end of the inner blocking cylinder 2 is provided with an outward and upward guiding flange, when the pins 4 are inserted into the printed circuit board pin welding auxiliary device from top to bottom, the inner blocking cylinder 2 is positioned inside the outer sleeve 1, so that the observation of an operator is inconvenient, and the pins cannot be smoothly inserted into the inner blocking cylinder 2; and can insert interior fender section of thick bamboo 2 in-process through the direction turn-ups and lead, guarantee pin 4 male smooth and easy nature and convenience, improve the operating efficiency.

Further, a plurality of through holes 22 are formed in the inner blocking cylinder 2. The through hole 22 is communicated with the space outside the pin 4 and the space inside the outer sleeve 1, and welding pollutants rising from the gap between the lower end of the inner blocking cylinder 2 and the pin 4 are drifted into the space between the outer sleeve 1 and the inner blocking cylinder 2 through the through hole 22, so that the concentration of the welding pollutants on the outer ring of the pin 4 can be quickly reduced, and the pollution corrosion of the welding pollutants on the pin 4 is reduced.

Wherein, through-hole 22 keeps off a section of thick bamboo 2 annular array setting in, guarantees that the welding pollutant passes through the interior stability and the homogeneity that the interior side space of through-hole 22 outside sleeve scatters, avoids welding pollutant maldistribution phenomenon.

As shown in fig. 4, wherein the inner side of the outer sleeve 1 is covered with an adsorption layer 5. Carry out effective absorption to the welding pollutant of come-up through adsorbed layer 5, the welding pollutant concentration of greatly reduced pin 4 outer lane avoids the pollution and corrosion of welding pollutant to pin 4.

In one embodiment, the material of the adsorption layer 5 is activated carbon. Activated carbon is a specially treated carbon produced by heating an organic raw material (husk, coal, wood, etc.) in the absence of air to reduce non-carbon components (this process is called carbonization), and then reacting with a gas to erode the surface and produce a structure with developed micropores (this process is called activation). Since the activation process is a microscopic process, i.e., the surface erosion of a large amount of molecular carbides is a point-like erosion, the surface of the activated carbon is caused to have countless fine pores. The diameter of micropores on the surface of the activated carbon is mostly between 2 nm and 50nm, even a small amount of activated carbon has huge surface area, the surface area of each gram of activated carbon is 500 to 1500 square meters, and the activated carbon has strong adsorption capacity. The activated carbon can be used as the material of the adsorption layer 5 to effectively adsorb welding pollutants.

In another embodiment, the material of the adsorption layer 5 is a functionalized graphene material. After the surface of the graphene is modified or welded by a surfactant, a nano material, a carbon nano tube, biochar and the like, a functional graphene material with better adsorption capacity can be generated, and the functional graphene material has a larger specific surface area and superior magnetic properties and can effectively adsorb electrons in polar bonds in welding pollutants.

The specific use method of the printed circuit board pin welding auxiliary device comprises the following steps:

the method comprises the following steps: assembling the auxiliary device for welding the pins of the printed circuit board; the inner blocking cylinder 2 is placed into the outer sleeve 1 from the large opening end of the outer sleeve 1, and the square slots on the inner blocking cylinder 2 are aligned with the guide grooves 11 on the outer sleeve 1 one by one; the operating rod 21 penetrates through the guide groove 11 from the outside to the inside, is inserted into the square insertion groove on the inner blocking barrel 2 and is tightly inserted; the operating lever 21 is lifted up, and the operating lever 21 is guided along the guide groove 11 so that the upper surface of the operating lever 21 is brought into contact with the upper edge of the guide groove 11.

Step two: the auxiliary device for welding the pins of the printed circuit board is arranged with the pins 4 of the parts; the operating rod 21 and the parts to be welded are held by hands, so that the pins 4 of the parts are inserted from the small-opening end of the outer sleeve 1, penetrate through the inner blocking cylinder 2 and extend out of the end face of the large-opening end of the outer sleeve 1; adjusting the distance of the pin 4 extending out of the end face of the large opening end of the outer sleeve 1 to meet the requirement of welding length;

step three: the auxiliary device for welding the pins of the printed circuit board is placed on the upper surface of the circuit board 3, so that the lower surface of the ring platform 13 at the lower end of the outer sleeve 1 is attached to the upper surface of the circuit board 3, and the pins 4 penetrate through pin holes 31 on the circuit board 3 and extend out of the lower ends of the pin holes 31 for a welding length; pressing the operating rod 21 downwards, guiding the operating rod 21 downwards along the guide groove 11, and then rotating the operating rod 21 to enable the horizontal locking groove 12 to horizontally lock the operating rod 21; at this time, the outer conical surface of the funnel-shaped structure at the lower part of the inner barrier 2 is closely attached to the upper edge of the pin hole 31, and the outer conical surface of the funnel-shaped structure at the lower part of the inner barrier 2 is completely attached to the chamfered surface at the upper edge of the inner ring of the annular table 13.

Step four: wave soldering; performing wave soldering on the pins 4 extending out of the lower surface of the circuit board 3 by using a wave soldering machine; in the welding process, high-temperature tin liquid overflows along the pin holes 31, and the overflow height of the tin liquid is controlled through the lower end of the inner blocking cylinder 2, so that the firm welding effect on the pins 4 can be ensured, the excessive upward movement and overflow of the tin liquid can be effectively avoided, and the welding quality is ensured; and the pollutant that the welding produced floats through the clearance between interior fender section of thick bamboo 2 lower extreme and pin 4 to in the space between outer sleeve 1 and interior fender section of thick bamboo 2 is wafted to through-hole 22, the welding pollutant is through the high-efficient absorption of adsorbed layer 5 of outer sleeve 1 inboard, the pollutant concentration of greatly reduced pin 4 outer lane, and stop the welding pollutant to cause the unusual problem of function to circuit board 3 and spare part, guarantee wave-soldering's quality and wave-soldering's security.

The auxiliary device for welding the pins of the printed circuit board has the advantages of simple integral structure, low manufacturing cost, easy realization, simple use and good practicability; when wave soldering is carried out on pins of parts, the pins sequentially penetrate through the device and pin holes in the circuit board from top to bottom, so that the inner blocking cylinder and the outer sleeve are sleeved outside the pins, the small opening end at the upper part of the outer sleeve is tightly hooped with the outside of the pins without a gap, and the end face of the large opening end at the lower part of the outer sleeve is attached to the upper surface of the circuit board; the length of the pins extending out of the lower ends of the pin holes downwards is adjusted, the inner blocking cylinder slides downwards relative to the outer sleeve, and the middle part of the outer conical surface of the funnel-shaped structure at the lower part of the inner blocking cylinder is tightly pressed and attached to the upper edges of the pin holes; performing wave soldering on the pins protruding from the lower surface of the circuit board by using a wave soldering machine, wherein high-temperature tin liquid flows and diffuses upwards through gaps between the pins and pin holes in the wave soldering process; because the outer conical surface of the funnel-shaped structure at the lower part of the inner blocking cylinder is attached to the upper edge of the pin hole, the upward overflow of molten tin can be effectively blocked, and the quality of wave soldering is ensured; the lower end of the outer sleeve is matched with the upper surface of the circuit board, so that welding pollutants are effectively prevented from spreading and scattering to the periphery of the upper surface of the circuit board, and the circuit short circuit and corrosion risks of the circuit board are avoided; the small opening end of the upper part of the outer sleeve is tightly hooped and sealed with the outer ring of the pin, so that welding pollutants can be effectively prevented from moving upwards along the pin, and the problem that the welding pollutants move upwards and enter the inside of parts to cause damage and failure of the parts is avoided; effectively guarantee the wave soldering quality and the welding security of circuit board pin.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The terms "upper", "lower", "outside", "inside" and the like in the description and claims of the present invention and the above drawings are used for distinguishing relative positions if any, and are not necessarily given qualitatively. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.