CN108176907A - Wave soldering furnace - Google Patents

Abstract

The invention relates to a wave soldering furnace, wherein a horizontally arranged furnace body is provided with a feeding end and a discharging end, two transmission chain claws are respectively assembled on a guide rail of the furnace body correspondingly, and the transmission chain claws circularly move between the feeding end and the discharging end of the furnace body; a soldering flux spraying device, a preheating device, a wave soldering device and a cooling device are sequentially distributed in the furnace body along the feeding direction of the transmission chain claw; an air draft device is arranged above the scaling powder spraying device, a smoke alarm is arranged in the furnace body and above the preheating device, and the preheating device is provided with heating modules which are respectively arranged on the upper side and the lower side of the transmission chain claw; wave-soldering device is assembled in the furnace body through the activity concatenation, reserves the passageway of wave-soldering device business turn over furnace body on the furnace body, and convenient maintenance and replacement help the production continuity, and the side heating from top to bottom preheats soon and evenly, and smoke alarm effectively monitors operational environment in the furnace body, reaches in time control production, avoids the production unfavorable condition that smog caused, accords with the industrial utilization.

Description

A wave soldering furnace

technical field

The invention relates to the technical field of component welding processing of circuit boards, in particular to a wave soldering furnace.

Background technique

In the field of soldering and processing of circuit board components, two methods are usually used: reflow soldering and wave soldering. When the assembly assembly of the device passes through the solder wave at a certain angle, the process technology of forming a solder joint in the lead pad area. The components are preheated in the preheating zone of the welding machine during the process of being conveyed by the chain conveyor belt (the component preheating and the temperature to be reached are still controlled by the predetermined temperature curve). In actual welding, it is usually necessary to control the preheating temperature of the component surface, so many devices have added corresponding temperature detection devices. After preheating, the components are soldered by a wave of solder. Specifically: the tin tank is filled with molten liquid solder, and the nozzle at the bottom of the steel tank will form a wave of a fixed shape when the molten solder is touched. In this way, when the soldering surface of the component passes through the wave, it will be heated by the solder wave, and the solder wave will also wet the solder. The area is expanded and filled, and the welding process is finally realized. Therefore, the structural layout, working quality, stability and operability of the wave soldering furnace greatly affect the development of wave soldering technology. For this reason, the applicant upholds the spirit of research, innovation and excellence, and utilizes professional vision and professional knowledge to develop a wave soldering furnace suitable for industrial use, that is, to file this application.

Contents of the invention

The object of the present invention is to provide a wave soldering furnace, which has a simple and compact structure, is suitable for industrial use, and improves the quality, stability and operability of wave soldering.

To achieve the above object, the present invention adopts the following technical solutions:

A wave soldering furnace, which includes a horizontal furnace body, the furnace body has a feed end and a discharge end, the furnace body is provided with a guide rail that bridges between the feed end and the discharge end of the furnace body, The two transmission chain claws are respectively assembled on the guide rails of the furnace body, and the transmission chain claws move circularly between the feeding end and the discharging end of the furnace body; the furnace body distributes flux sequentially along the feeding direction of the transmission chain claws Spraying device, preheating device, wave soldering device and cooling device; an exhaust device is arranged above the flux spraying device, a smoke alarm is installed in the furnace body and above the preheating device, and the preheating device has a separate transmission chain The heating modules on the upper and lower sides of the claws; the wave soldering device is assembled into the furnace body through movable splicing, and the channel for the wave soldering device to enter and exit the furnace body is reserved on the furnace body.

The above solution is further as follows: the width between the two transmission chain claws is adjusted through a helical gear mechanism, the helical gear mechanism drives a width adjustment screw, and the width adjustment screw is threadedly connected with a screw nut, and the width adjustment screw straddles the Between the guide rails where the two transmission chain claws are assembled, one of the two guide rails follows the screw nut and moves along the width-adjusting screw to realize the adjustment of the width between the two transmission chain claws.

The above scheme is further as follows: the air exhaust device includes a wind collecting hood and an exhaust fan connected to the air collecting hood, the air exhaust device is provided with an air draft sensor, and the air exhaust sensor includes a wind measuring interface ring assembled on the air exhaust pipeline. The wind measuring interface ring is equipped with a radially arranged wind measuring shaft and wind measuring blades assembled on the wind measuring shaft. The end of the wind measuring shaft protruding out of the wind measuring interface ring is provided with a photosensitive sheet, and the photosensitive sheet is matched with The photoelectric switch works, and the photoelectric switch is connected to the control system of the wave soldering furnace.

The above scheme is further: the flux spraying device is a rosin spray mechanism, has a liquid storage tank and a mobile nozzle connected to the liquid storage tank, the liquid storage tank is connected to the rosin supply source through a self-replenishing pump, and the self-replenishing pump is controlled by the Liquid level control.

The above scheme is further as follows: the wave soldering device has a support and a tin bath arranged on the support, the liquid solder surface of the tin bath forms a solder wave of a specific shape; the tin bath is driven by a motor screw mechanism to lift relative to the support; There is a floating ball, the floating ball is suspended at one end of the lever, the other end of the lever is connected to the upper end of the upper and lower lead rods, and the induction sheet is set at the lower end of the upper and lower lead rods. The induction sheet works with a light sensor, and the light sensor is connected to the wave soldering furnace Control System.

The above solution further includes: the transmission chain claw includes a chain and a claw arranged on the lower side of the chain, the chain is assembled to connect the sprocket arranged on the guide rail; the claw has a root and a load-bearing claw head, and the root of the claw and the load-bearing claw head have a conjoined structure , the base of the claw connects to the lower end of the pivot shaft of the chain.

The above scheme is further as follows: a tubular guide rod is sleeved on the width-adjusting screw rod, and there is a bearing support connection between the width-adjusting screw rod and the tubular guide rod; a long guide groove is provided on the tubular guide rod, and the tubular guide rod One end is connected to the first supporting seat after passing through the first pressing claw support, and one end of the width-adjusting screw passing through the first supporting seat is connected to one helical gear of the helical gear mechanism; the other end of the tubular guide rod passes through the second The pressure jaw support is connected to the second support seat, and a width-adjusting copper sleeve is provided between the tubular guide rod and the second pressure jaw support, and the screw nut is arranged on the width-adjusting screw rod inside the width-adjusting copper sleeve. The two ends of the sleeve are provided with a width-adjusting pressure plate, which is fixed on the second pressure jaw support, and the width-adjusting pressure plate has a lower presser foot, which extends into the long guide groove of the tubular guide rod to clamp and limit the pressure. screw nut; the second pressure claw support is installed on the movable guide rail.

The above scheme is further as follows: the tin bath is fixed on the middle seat, the middle seat is assembled with lifting screw rods in four directions, the lifting screw rods are threadedly connected to the lifting nuts arranged on the bracket, and the four lifting nuts are connected to the same power runner through lifting chains.

The above scheme is further as follows: the discharge end of the furnace body is provided with a claw washing device, and the claws of the transmission chain pass through the claw washing device to clean the claws when the discharge end of the furnace body rotates.

The above scheme is further as follows: both the feed end and the discharge end of the furnace body are provided with online signal ports.

Through effective structural design, the present invention achieves that the wave soldering device is assembled into the furnace body through movable splicing, which is convenient for maintenance and replacement, contributes to the continuity of production, and avoids downtime; The component surface of the circuit board is preheated quickly and evenly, which helps to improve the quality and stability of wave soldering. There is a smoke alarm in the furnace body, which can effectively monitor the working environment in the furnace body, achieve timely alarm prompts and control production, and avoid production caused by smoke. Unfavorable conditions, stable wave soldering is carried out in an ideal environment, which also helps to improve the quality and stability of wave soldering. The invention has relatively simple structure, reasonable layout, convenient and stable work, greatly improves the operation rate and operability of the wave soldering furnace, and is suitable for industrial application.

Description of drawings:

Accompanying drawing 1 is the preferred embodiment structural representation of the present invention;

Accompanying drawing 2 is the top view structural layout schematic diagram of the embodiment of Fig. 1;

Accompanying drawing 3 is the partial structure side view schematic diagram of Fig. 1 embodiment;

Accompanying drawing 4 is the schematic structural diagram of the draft sensor attached to the draft device in the embodiment of Fig. 1;

Accompanying drawing 5 is the schematic diagram of the tin level control structure of the tin bath of the embodiment of Fig. 1;

Accompanying drawing 6 is the schematic diagram of the assembly structure of the width-adjusting screw rod of the embodiment of Fig. 1;

Accompanying drawing 7 is a schematic diagram of the partial structure of the transmission chain claw of the embodiment in Fig. 1 .

Detailed ways:

The idea, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of the present invention.

Referring to Figures 1 to 7, the present invention relates to a wave soldering furnace, which includes a horizontal furnace body 1 and a corresponding control system. The furnace body 1 has a feed end and a discharge end. Bridge the guide rail 11 between the feed end and the discharge end of the furnace body 1, and the two transmission chain claws 2 are respectively assembled on the guide rail 11 of the furnace body 1, and the transmission chain claws 2 are between the feed end and the discharge end of the furnace body 1 Circular movement between discharge ends. A flux spraying device 3 , a preheating device 4 , a wave soldering device 5 and a cooling device 6 are sequentially distributed in the furnace body 1 along the feeding direction of the transmission chain claws 2 . The structure is relatively simple, the layout is reasonable, and the integrity is good. An exhaust device 7 is arranged above the flux spraying device 3, and the exhaust device 7 collects the fumes of the flux and discharges them out of the furnace body, and can realize effective recovery of the flux. A smoke alarm 12 is installed in the furnace body 1 above the preheating device 4 to effectively monitor the working environment in the furnace body, achieve timely alarm prompts and control production, avoid production failure caused by smoke, and stabilize wave soldering in an ideal environment. It also helps to improve the quality and stability of wave soldering. The preheating device 4 has heating modules arranged on the upper and lower sides of the transmission chain claw 2 to realize the upper and lower heating mode, which helps the component surface of the circuit board to preheat faster and evenly, thereby improving the quality and stability of wave soldering. The wave soldering device 5 is assembled into the furnace body 1 through movable splicing, and the passage for the wave soldering device 5 to enter and exit the furnace body is reserved on the furnace body 1. This structure is convenient for maintenance and replacement, contributes to the continuity of production, and avoids shutdown, thereby The improvement greatly improves the operation rate and operability of the wave soldering furnace, which is in line with industrial application. The cooling device 6 is cooled by cold air, so that solder joints are formed after the welding is rapidly cooled, and the problem of bridging or short circuit is effectively solved at the same time.

As shown in Figures 1, 2, 3 and 6, in this embodiment, the width of the two transmission chain claws 2 is adjusted through a helical gear mechanism, and the width adjustment is accurate and convenient. The helical gear mechanism drives a width-adjusting screw 81, which is threadedly connected to a threaded screw nut 82. The width-adjusting screw 81 spans between the guide rails 11 on which two transmission chain claws 2 are assembled, and the two guide rails 11 A guide rail 11 moves along the width-adjusting screw rod 81 following the screw nut 82 to realize the width adjustment between the two transmission chain claws 2 . In this embodiment, a tubular guide rod 83 is sleeved on the width-adjusting screw rod 81, and there is a bearing support connection between the width-adjusting screw rod 81 and the tubular guide rod 83; the tubular guide rod 83 is provided with a long guide groove 831 One end of the tubular guide rod 83 passes through the first claw support 84 and connects to the first support seat 85, and one end of the width-adjusting screw rod 81 passing through the first support seat 85 is connected to one helical gear of the helical gear mechanism; The other end of the tubular guide rod 83 passes through the second claw support 86 and is connected to the second support seat 87. A copper sleeve 88 for adjusting the width is provided between the tubular guide rod 83 and the second claw support 86, and a screw nut 82 is arranged on the width-adjusting screw rod 81 inside the width-adjusting copper sleeve 88, and the two ends of the width-adjusting copper sleeve 88 are provided with a width-adjusting pressing plate 89, and the width-adjusting pressing plate 89 is fixed on the second claw support 86, and the adjustment The wide presser plate 89 has a lower presser foot 891, and the lower presser foot 891 stretches into the strip guide groove 831 of the tubular guide rod 83 to clamp and restrict the screw nut 82; the second presser claw support 86 is installed on the movable guide rail 11 superior. When working, the width-adjusting screw 81 rotates under the drive of the helical gear mechanism, and the screw nut 82 moves relative to the width-adjusting screw 81. At the same time, under the linkage of the width-adjusting pressure plate 89, the second pressure claw support 86 moves accordingly, thereby achieving adjustment. The distance between the two guide rails 11 is to adjust the width between the two transmission chain claws 2 to meet the welding needs of circuit boards of different sizes. In this embodiment, the tubular guide rod 83 plays the role of strengthening the structure and giving guidance. The bellows (not shown in the figure) is sleeved to protect the tubular guide rod 83 to prevent oil dirt from adhering and affecting the width adjustment operation.

In this embodiment, the air exhaust device 7 includes an air collection hood 76 and an exhaust fan 77 connected to the air collection hood 76. The air exhaust device 7 is provided with an air draft sensor. The wind interface ring 71 is provided with a radially arranged wind measuring shaft 72 and a wind measuring blade 73 assembled on the wind measuring shaft 72 in the wind measuring interface ring 71, and the wind measuring shaft 72 extends out of one end of the wind measuring interface ring 71 There is an induction photosensitive sheet 74, and the induction photosensitive sheet 74 works with a photoelectric switch 75, and the photoelectric switch 75 is connected to the control system of the wave soldering furnace. The sensing photosensitive sheet 74 rotates following the wind measuring shaft 72 and the wind measuring vane 73 , and the photoelectric switch 75 senses the sensing photosensitive sheet 74 and transmits the signal to the control system of the wave soldering furnace. When this structure worked, the exhaust fan 77 normally draws air, the wind measuring vane 73 is opened by the wind force, the wind measuring shaft 72 rotates, the sensing photosensitive sheet 74 follows the rotation, and the sensing photosensitive sheet 74 deflects an angle to block the light path of the photoelectric switch 75, the photoelectric The circuit of the switch 75 is disconnected; and when the exhaust fan 77 has a reduced air volume or even breaks down and does not work, the wind measuring blade 73 is closed, the wind measuring shaft 72 rotates, the sensing photosensitive sheet 74 follows the rotation, and the photoelectric switch 75 passes through the sensing photosensitive sheet. The gap on the 74 is connected to the circuit, and the signal is transmitted to the control system of the wave soldering furnace to achieve alarm prompts and control production, to prevent the backlog of rosin smoke from damage to the exhaust fan, and to prevent the diffusion of rosin smoke into the machine to ensure production safety.

In this embodiment, the flux spraying device 3 is a rosin spraying mechanism, which has a liquid storage tank and a mobile nozzle connected to the liquid storage tank. Advanced liquid level control, thereby achieving low-level rosin alarm and self-replenishment effects, and improving the automation of wave soldering furnaces.

Shown in Fig. 1,3,5, in the present embodiment, described wave soldering device 5 has support 51 and is arranged on the tin tank 52 on support 51, and the liquid solder surface of tin tank 52 forms the solder wave of specific shape; 52 is driven by the motor screw mechanism to lift relative to the support 51; a float 53 is provided in the tin bath 52, and the float 53 is suspended on one end of the lever 54, and the other end of the lever 54 is connected to the upper end of the upper and lower guide rods 55, and the upper and lower guide rods The lower end of the 55 is provided with an induction sheet 56, and the induction sheet 56 works with a light sensor 57, and the light sensor 57 is connected to the control system of the wave soldering furnace. The upper and lower guide rods 55 reflect the position of the floating ball 53 through the lever 54. When the tin level is low, the floating ball 53 sinks, and the upper and lower guide rods 55 move upward. Sensing the induction sheet 56 and transmitting the signal to the control system of the wave soldering furnace, thereby achieving the low tin level alarm monitoring of the wave soldering device 5 . In this embodiment, the tin bath 52 is fixed on the middle seat 58, and the middle seat 58 is assembled with lifting screw rods 581 in four directions. The lifting chain 59 is connected to the same power runner 591 . The structure is simple, and it is convenient to adjust the height of the liquid solder surface on the tin bath 52 to meet the working conditions of sufficient contact, heating, and wetting when the soldering surface of the circuit board component passes through the wave, which helps to improve the soldering quality and stability. In this embodiment, the wave soldering device 5 can be in the form of a single wave or a double wave. In order to facilitate movement, the bottom of the bracket 51 is properly equipped with rollers, so that the assembly is light and fast, and the operability of the wave soldering furnace is improved.

As shown in Figures 1, 2, 3, and 7, in the present embodiment, the transmission chain claw 2 includes a chain 21 and a claw 22 arranged on the lower side of the chain 21, and the chain 21 is assembled to connect the sprocket arranged on the guide rail 11; the claw 22 has a root and a load-bearing claw head, and the root of the claw 22 and the load-bearing claw head have a conjoined structure, and the root of the claw 22 is connected to the lower end of the pivot shaft of the chain 21 . The pawl 22 of this structural design has a better structure, and is connected to the lower end of the pivot shaft of the chain 21, the moment arm is short, the load capacity is better, and the material transmission is more stable. In the figure, this embodiment can further add a limit structure on the inner edge of the root of the claw 22 to prevent the root of the claw 22 from lifting, ensure the smooth and normal transmission of the chain 21, and also achieve lifting load to meet the production needs of different products. In this embodiment, the discharge end of the furnace body 1 is provided with a claw washing device 9, and the transmission chain claw 2 passes through the claw cleaning device 9 to clean the claws 22 when the discharge end of the furnace body 1 rotates. The brush and the cleaning solution clean the claws 22, and automatically remove the sundries of the claws 22 for loading and welding again.

As shown in Fig. 1, in the present embodiment, on-line signal port 13 is all provided with on the feed end and discharge end of described furnace body 1, and on-line signal port 13 is quick plug-in port, can realize by on-line signal port 13 like this Multi-machine connection works to meet the requirements of production and workshop layout.

Through effective structural design, the present invention has relatively simple structure, reasonable layout, convenient and stable work, greatly improves the operation rate and operability of the wave soldering furnace, and is suitable for industrial utilization.

Although the preferred specific embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention should not be limited to the same structure and operation as those described above and accompanying drawings. For those skilled in the art, many improvements and changes can also be made to the above-mentioned embodiments through logical analysis, reasoning or limited experiments without exceeding the concept and scope of the present invention, and these improvements and changes should all belong to the present invention Scope of protection claimed.

Claims (10)

1. a kind of wave-soldering furnace, it is characterised in that：Include the furnace body of horizontal setting（1）, furnace body（1）With feeding end and discharging End, in furnace body（1）It is equipped with bridging furnace body（1）Feeding end and discharge end between guide rail（11）, two transmission chain claws（2）Point Furnace body Dui Ying be assembled in（1）Guide rail（11）On, transmit chain claw（2）In furnace body（1）Feeding end and discharge end between recycle It is mobile；The furnace body（1）Inside carry over transmission chain claw（2）Feed direction be sequentially distributed Welding compound spraying coater（3）, preheating device （4）, Wave-soldering device（5）And cooling device（6）；The Welding compound spraying coater（3）Top be disposed with extractor fan（7）, Furnace body（1）It is interior, positioned at preheating device（4）Top is equipped with smoke alarm（12）, preheating device（4）Chain claw is being transmitted with splitting （2）The heating module of upper and lower sides；The Wave-soldering device（5）Furnace body is assembled by moving jointing（1）It is interior, furnace body（1）It is upper pre- Stay Wave-soldering device（5）Pass in and out the channel of furnace body.

2. a kind of wave-soldering furnace according to claim 1, it is characterised in that：Two transmission chain claw（2）Between pass through Oblique gear mechanism adjusts width, and wide screw is adjusted in oblique gear mechanism driving one（81）, adjust wide screw（81）It is threadedly coupled a screw spiral shell It is female（82）, it is described to adjust wide screw（81）Across in two transmission chain claws of assembling（2）Guide rail（11）Between, two guide rails（11）In have One guide rail（11）Follow feed screw nut（82）Along the wide screw of tune（81）It is mobile, realize two transmission chain claws（2）Between adjust width.

3. a kind of wave-soldering furnace according to claim 1, it is characterised in that：The extractor fan（7）Including wind-collecting cover （76）And connection wind-collecting cover（76）Exhaust fan（77）, extractor fan（7）Exhausting inductor is equipped with, which includes There are the survey wind interface rings being assembled on air draft pipeline（71）, surveying wind interface rings（71）The interior survey wind axis equipped with radial arrangement（72） And it is assembled in survey wind axis（72）On survey fan blade（73）, survey wind axis（72）It stretches out and surveys wind interface rings（71）Outer one end is equipped with sensing Light sensation piece（74）, sense light sensation piece（74）Collocation optoelectronic switch（75）Work, optoelectronic switch（75）Connect the control of wave-soldering furnace System.

4. a kind of wave-soldering furnace according to claim 1, it is characterised in that：The Welding compound spraying coater（3）It is rosin Humidifier has reservoir and connects the moving nozzle of reservoir, and reservoir connects rosin source of supply by self-complementary pump, self-complementary Pump is controlled by the liquid level meter in reservoir.

5. a kind of wave-soldering furnace according to claim 1, it is characterised in that：The Wave-soldering device（5）With stent （51）And it is arranged on stent（51）On molten tin bath（52）, molten tin bath（52）Liquid solder surface formed specific shape solder wave； Molten tin bath（52）By motor lead screw, mechanism is driven and opposite brackets（51）Lifting；Molten tin bath（52）In be equipped with floating ball（53）, floating ball （53）It is suspended on lever（54）One end, lever（54）The other end connection up and down draw bar（55）Upper end, drawing bar up and down （55）Lower end setting sensing chip（56）, sensing chip（56）Collocation optical flame detector（57）Work, optical flame detector（57）Connect wave-soldering furnace Control system.

6. a kind of wave-soldering furnace according to claim 1 or 2, it is characterised in that：The transmission chain claw（2）Include chain （21）And it is arranged on chain（21）The claw of downside（22）, chain（21）Assembly and connection guide rail（11）The sprocket wheel of upper arrangement；Claw （22）With root and carrying pawl head, claw（22）Root and carrying pawl head connecting body structure, claw（22）Root connection chain Item（21）Pivotal axis lower end.

7. a kind of wave-soldering furnace according to claim 2, it is characterised in that：It is described to adjust wide screw（81）One tubulose of upper socket Guide rod（83）, adjust wide screw（81）With tubulose guide rod（83）Between have bearings connection；Tubulose guide rod（83）It is equipped with strip Guide groove（831）, the tubulose guide rod（83）One end passes through the first claw bearing（84）After connect the first support base（85）, adjust wide silk Bar（81）It is pierced by the first support base（85）One end connection oblique gear mechanism one helical gear；The tubulose guide rod（83）It is another One end passes through the second claw bearing（86）After connect the second support base（87）, tubulose guide rod（83）With the second claw bearing（86）It Between be equipped with and adjust wide copper sheathing（88）, feed screw nut（82）It is arranged on the wide copper sheathing of tune（88）Internal tune width screw（81）On, adjust wide copper Set（88）Two ends be equipped with and adjust wide pressing plate（89）, adjust wide pressing plate（89）It is fixed on the second claw bearing（86）On, and adjust wide pressure Plate（89）With lower foot clamp（891）, lower foot clamp（891）Stretch into tubulose guide rod（83）Strip guide groove（831）It is interior to clamp limitation silk Stem nut（82）；The second claw bearing（86）Mounted on movable guide rail（11）On.

8. a kind of wave-soldering furnace according to claim 5, it is characterised in that：The molten tin bath（52）It is fixed on middle level seat（58） On, middle level seat（58）Cubic hyte is equipped with elevating screw（581）, elevating screw（581）It is threadedly coupled stent（51）Upper setting Lifting nut（511）, four lifting nuts（511）Pass through elevating chain（59）Connect same power runner（591）.

9. a kind of wave-soldering furnace according to claim 1, it is characterised in that：The furnace body（1）Discharge end be equipped with wash pawl Device（9）, transmit chain claw（2）In furnace body（1）Discharge end revolution when by washing jaw arrangement（9）Clean claw（22）.

10. a kind of wave-soldering furnace according to claim 1, it is characterised in that：The furnace body（1）Feeding end and discharge end On be equipped with online signal port（13）.