CN210280993U - Wave soldering stove nitrogen filling protection device that barrier propterty is good - Google Patents

Abstract

The utility model provides a crest soldering tin stove that barrier propterty is good fills nitrogen protection device, including removing the wheel, support the base, the hand push handle, the lag, supplementary pipe, the nitrogen gas honeycomb duct structure that can shunt can discharge fume the protection casing structure, and the welding slag of convenient clearance is collected and is fought the structure, and supplementary valve, manometer, observation window, liquid nitrogen storage box, control switch leads the nitrogen gas pipe, adjusting valve, bracing piece and soldering station. The arrangement of the gas guide pipe, the electromagnetic valve and the anti-overflow cover of the utility model is favorable for controlling the discharge amount of nitrogen according to the soldering requirement and ensuring the full protection effect; the protective cover body is a transparent PVC plastic cover with openings at the front part and the lower part, so that the protective cover is favorable for shielding and protecting, the leakage of nitrogen is prevented, the accuracy of soldering is ensured, and the protective performance is improved; the arrangement of the discharge through hole, the sealing plug and the hand-held belt is favorable for playing a sealing role and conveniently cleaning collected waste residues into a specified container.

Description

Wave soldering stove nitrogen filling protection device that barrier propterty is good

Technical Field

The utility model belongs to the technical field of the welding, especially, relate to a crest soldering tin stove that barrier propterty is good fills nitrogen protection device.

Background

At present, the majority of electronic processing enterprises face the double pressure of continuous improvement of product quality requirements and continuous rise of various production costs of products, customers only promote the product processing technology as much as possible, improve production equipment, aim at meeting the quality requirements of customers, promote the first pass rate of products as much as possible, reduce defective products and the related costs such as material waste and repair labor hour brought by the defective products, and further realize the improvement of product quality and the reduction of product production cost.

If a nitrogen-filled protection device is adopted in wave soldering, the welding quality of a product can be effectively improved, and the welding defects of insufficient solder, bridging (short circuit), dark welding spots, too dirty boards and the like are greatly reduced, so that the first pass rate of the product is improved, and the improvement target is not less than 50%; because nitrogen protection is adopted, the tin slag generation of the tin furnace can be greatly reduced, namely, the consumption of tin is reduced, and the target tin slag generation amount is 10% -15% of the original tin slag generation amount, so that the indirect production costs such as product quality improvement, product production cost repair labor, defective product wave, tin slag generation amount and the like are realized.

The invention discloses a nitrogen-filled protection device of a wave soldering tin furnace with a Chinese patent publication number of CN208214537U, which comprises: a protective cover; the nitrogen-filled nanotube is fixed on the protective cover; an external nitrogen gas pipe connected with the nitrogen-filled nanotube for providing nitrogen gas. However, the existing nitrogen-filling protection device for the wave soldering furnace has the problems of poor protection performance, no function of collecting waste residues generated by welding and inconvenience in ventilation and smoke exhaust after welding.

Therefore, the nitrogen-filled protection device with good protection performance for the wave soldering tin furnace is very necessary to be invented.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a wave soldering tin stove that barrier propterty is good fills nitrogen protection device to it is relatively poor to solve current wave soldering tin stove and fill nitrogen protection device barrier propterty, does not possess to weld and produces the waste residue and collect the function and weld the inconvenient problem of discharging fume of ventilating after finishing. A wave soldering furnace nitrogen filling protection device with good protection performance comprises moving wheels, a supporting base, a hand push handle, a protection cover, a supplement pipe, a nitrogen guide pipe structure capable of shunting, a smoke exhaust protection cover structure, a welding slag collecting hopper structure convenient to clean, a supplement valve, a pressure gauge, an observation window, a liquid nitrogen storage box, a control switch, a nitrogen guide pipe, an adjusting valve, a support rod and a soldering table, wherein the moving wheels are respectively bolted at four corners of the lower surface of the supporting base; the hand push handle is connected to the upper part of the left side of the liquid nitrogen storage box through a screw; the protective sleeve is sleeved in the middle of the outer surface of the hand push handle; the replenishing pipe is embedded at the left side position of the upper surface of the liquid nitrogen storage box; the supplementary valve is in threaded connection with the middle position of the upper surface of the supplementary pipe; the structure of the distributable nitrogen guide pipe is arranged at the lower part of the nitrogen guide pipe; the smoke-discharging protective cover structure is arranged at the rear part of the distributable nitrogen guide pipe structure; the welding slag collecting hopper structure convenient to clean is arranged at the lower part of the smoke exhaust protective cover structure; the observation window is embedded in the middle of the upper part of the front surface of the liquid nitrogen storage box; the pressure gauge is in threaded connection with the middle position of the upper surface of the liquid nitrogen storage box; the control switch is embedded in the right upper side of the front surface of the liquid nitrogen storage box; the liquid nitrogen storage box is connected to the upper surface of the supporting base through bolts; the nitrogen guide pipe is embedded at the right side of the upper surface of the liquid nitrogen storage tank; the adjusting valve is in threaded connection with the right side of the upper surface of the nitrogen guide pipe; one end of the supporting rod is inserted in a welding slag collecting hopper structure convenient to clean, and the other end of the supporting rod is respectively connected to the four corners of the lower surface of the soldering station through screws; the distributary nitrogen guide pipe structure comprises an air injection coil pipe, a connecting pipe, a gas guide pipe, an electromagnetic valve and an anti-overflow cover, wherein the connecting pipe is welded in the middle of the upper surface of the air injection coil pipe and is communicated with the inside of the air injection coil pipe; the gas guide pipe is in threaded connection with the lower surface of the gas spraying coil pipe and is communicated with the inside of the gas spraying coil pipe; the electromagnetic valve is embedded in the upper side position inside the gas guide pipe; the anti-overflow cover is sleeved on the lower part of the outer surface of the gas guide pipe.

Preferably, the smoke-exhaust protective cover structure comprises a protective cover body, exhaust through holes, an exhaust fan, a baffle plate and a fixed sleeve, wherein the exhaust through holes are respectively formed in the upper positions of the left side and the right side of the protective cover body; the exhaust fan is embedded in the exhaust through hole; the shielding plate is movably inserted in the fixed sleeve and is positioned outside the exhaust through hole; the fixed sleeves are respectively glued at the upper parts of the left side and the right side of the protective cover body.

Preferably, the welding slag collecting hopper structure convenient to clean comprises a welding slag collecting hopper, a hand grab handle, a fixing clamping groove, a discharge through hole and a sealing plug, wherein the hand grab handle is connected to the middle position of the left side of the welding slag collecting hopper through a screw; the fixed clamping grooves are respectively formed in the four corners of the inner lower surface of the waste residue collecting hopper; the discharge through hole is formed in the right side position of the lower surface inside the waste residue collecting hopper; the sealing plug is inserted in the discharge through hole.

Preferably, the upper left end of the sealing plug is glued with a hand strap; the sealing plug is a conical rubber plug; the hand strap is specifically made of a nylon cloth strap.

Preferably, the moving wheel is a rubber universal wheel with a brake pad; the number of the moving wheels is four.

Preferably, the protective sleeve is a cylindrical silica gel sleeve; the observation window adopts a toughened glass window with the thickness of five to eight millimeters.

Preferably, the soldering table is a circular stainless steel disc.

Preferably, the connecting pipe is a stainless steel pipe with internal threads; the inner surface of the connecting pipe is glued with a rubber layer; the connecting pipe is in threaded connection with the lower end of the nitrogen guide pipe.

Preferably, the air injection coil is glued on the lower surface of the protective cover body; the protective cover body is a transparent PVC plastic cover with openings at the front part and the lower part.

Preferably, the liquid nitrogen storage tank is communicated with the interior of the gas spraying coil pipe through a nitrogen guide pipe.

Preferably, the waste residue collecting hopper is connected to the lower part of the protective cover body through a screw.

Preferably, the exhaust fan and the electromagnetic valve are respectively and electrically connected with the control switch; the exhaust fan is a fan with the model number of H300-3; the electromagnetic valve is specifically an electromagnetic valve with the model number of M5; the pressure gauge is a Y100 pressure gauge; the liquid nitrogen storage box specifically adopts a storage tank with the model of YDD-1800.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses in, gaseous honeycomb duct, the setting of solenoid valve and anti-overflow cover, be favorable to controlling the discharge amount of nitrogen gas according to the needs of soldering, guarantee to play abundant protecting effect.

2. The utility model discloses in, the setting of jet-propelled coil and connecting pipe, be favorable to playing the carminative effect of reposition of redundant personnel.

3. The utility model discloses in, removal wheel specifically adopt the rubber universal wheel that has the brake block, be favorable to removing the use to this protector, increase the convenience of using.

4. The utility model discloses in, the protecting hood body specifically adopt anterior and lower part open-ended transparent PVC plastic casing, be favorable to playing the effect of sheltering from the protection, prevent revealing the accuracy of guaranteeing the soldering of nitrogen gas, improve barrier propterty.

5. The utility model discloses in, exhaust through-hole, the exhaust fan, shielding plate and fixed sleeving's setting are favorable to playing the carminative effect of ventilating after the welding finishes.

6. The utility model discloses in, the setting of waste residue collection fill and grab handle, be favorable to collecting the waste residue that produces among the welding process, maintain good welding environment.

7. The utility model discloses in, the setting of emission through-hole, sealing plug and portable area, be favorable to playing sealed effect and convenient waste residue clearance with the collection in the appointed container.

8. The utility model discloses in, the setting of hand push handle and lag, be favorable to carrying out the gripping, remove the device.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of the distributable nitrogen guide pipe structure of the present invention.

Fig. 3 is a schematic structural view of the smoke-discharging protective cover structure of the present invention.

Fig. 4 is a schematic structural view of the welding slag collecting bucket structure convenient for cleaning.

In the figure:

1. a moving wheel; 2. a support base; 3. a hand push handle; 4. a protective sleeve; 5. a replenishing pipe; 6. a distributable nitrogen guide pipe structure; 61. an air-jet coil pipe; 62. a connecting pipe; 63. a gas flow guide pipe; 64. an electromagnetic valve; 65. an anti-overflow cover; 7. a smoke-dischargeable shield structure; 71. a protective mask body; 72. an exhaust through hole; 73. an exhaust fan; 74. a shielding plate; 75. fixing the sleeve; 8. the welding slag collecting hopper structure is convenient to clean; 81. a waste residue collecting hopper; 82. a grab handle; 83. fixing the clamping groove; 84. a drain through hole; 85. a sealing plug; 851. a hand strap; 9. a replenishment valve; 10. a pressure gauge; 11. an observation window; 12. a liquid nitrogen storage tank; 13. a control switch; 14. a nitrogen guide pipe; 15. adjusting the valve; 16. a support bar; 17. and (4) a soldering station.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

example (b):

as shown in fig. 1 to 2, the utility model provides a nitrogen-filled protection device of a wave soldering furnace with good protection performance, which comprises a movable wheel 1, a support base 2, a hand push handle 3, a protective cover 4, a supplement pipe 5, a distributable nitrogen guide pipe structure 6, a smoke exhaust protective cover structure 7, a conveniently cleaned welding slag collecting hopper structure 8, a supplement valve 9, a pressure gauge 10, an observation window 11, a liquid nitrogen storage tank 12, a control switch 13, a nitrogen guide pipe 14, an adjusting valve 15, a support rod 16 and a soldering table 17, wherein the movable wheel 1 is respectively bolted at four corners of the lower surface of the support base 2; the hand push handle 3 is connected to the upper position of the left side of the liquid nitrogen storage box 12 through a screw; the protective sleeve 4 is sleeved in the middle of the outer surface of the hand push handle 3; the replenishing pipe 5 is embedded at the left side position of the upper surface of the liquid nitrogen storage box 12; the supplement valve 9 is in threaded connection with the middle position of the upper surface of the supplement pipe 5; the distributable nitrogen guide pipe structure 6 is arranged at the lower part of the nitrogen guide pipe 14; the smoke exhaust protective cover structure 7 is arranged at the rear part of the nitrogen flow guide pipe structure 6 capable of shunting; the welding slag collecting bucket structure 8 convenient to clean is arranged at the lower part of the smoke exhaust protective cover structure 7; the observation window 11 is embedded in the middle of the upper part of the front surface of the liquid nitrogen storage box 12; the pressure gauge 10 is in threaded connection with the middle position of the upper surface of the liquid nitrogen storage tank 12; the control switch 13 is embedded in the right upper side of the front surface of the liquid nitrogen storage box 12; the liquid nitrogen storage tank 12 is connected to the upper surface of the supporting base 2 through bolts; the nitrogen guide pipe 14 is embedded at the right side of the upper surface of the liquid nitrogen storage tank 12; the adjusting valve 15 is in threaded connection with the right side of the upper surface of the nitrogen guide pipe 14; one end of the support rod 16 is inserted in the welding slag collecting hopper structure 8 convenient to clean, and the other end of the support rod is respectively connected to the four corners of the lower surface of the soldering station 17 through screws; the distributable nitrogen guide pipe structure 6 comprises an air injection coil pipe 61, a connecting pipe 62, a gas guide pipe 63, an electromagnetic valve 64 and an anti-overflow cover 65, wherein the connecting pipe 62 is welded in the middle of the upper surface of the air injection coil pipe 61 and is communicated with the inside of the air injection coil pipe 61; the gas guide pipe 63 is in threaded connection with the lower surface of the gas spraying coil pipe 61 and is communicated with the inside of the gas spraying coil pipe 61; the electromagnetic valve 64 is embedded in the upper position inside the gas guide pipe 63; the anti-overflow cover 65 is sleeved at the lower part of the outer surface of the gas guide pipe 63; hand-hold the lag 4 and the hand push handle 3, promote liquid nitrogen storage box 12 under the effect of removing wheel 1, remove this protector to needs the soldering machine side that uses, place the material that needs the welding on the upper portion of soldering platform 17, welding operation is carried out in the inside of the protective housing body 71, adjust adjusting valve 15's size at this in-process, make the nitrogen gas in the liquid nitrogen storage box 12 enter into jet-propelled coil 61 and connecting pipe 62 through nitrogen gas guide pipe 14 in, and spout the welding material surface through gaseous honeycomb duct 63, play the effect of preventing oxidation, and control corresponding solenoid valve 64 through control switch 13 and carry out jet-propelled protection operation.

As shown in fig. 3, in the above embodiment, specifically, the smoke evacuation protection cover structure 7 includes a protection cover body 71, an exhaust through hole 72, an exhaust fan 73, a shielding plate 74 and a fixing sleeve 75, where the exhaust through hole 72 is respectively opened at upper positions of left and right sides of the protection cover body 71; the exhaust fan 73 is embedded in the exhaust through hole 72; the shielding plate 74 is movably inserted in the fixed sleeve 75 and is positioned outside the exhaust through hole 72; the fixed sleeves 75 are respectively glued at the upper parts of the left side and the right side of the protective cover body 71; in the process, the waste residues generated by welding fall into the waste residue collecting hopper 81, the sealing plug 85 is pulled out from the discharge through hole 84 by regularly holding the hand strap 851 by hands, and the waste residues are discharged into a specified container through the discharge through hole 84 by using a cleaning tool; the control switch 13 controls the operation of the exhaust fan 73 to play a role in ventilation and exhaust, and the shielding plate 74 plays a role in shielding and sealing when exhaust is not needed, so that overflow of nitrogen is prevented, and the utilization rate of nitrogen is improved.

As shown in fig. 4, in the above embodiment, specifically, the welding slag collecting bucket structure 8 convenient to clean includes a slag collecting bucket 81, a hand grip 82, a fixing slot 83, a discharge through hole 84 and a sealing plug 85, and the hand grip 82 is screwed to the middle position of the left side of the slag collecting bucket 81; the fixed clamping grooves 83 are respectively arranged at four corners of the inner lower surface of the waste residue collecting hopper 81; the discharge through hole 84 is arranged at the right side of the lower surface inside the waste residue collecting hopper 81; the sealing plug 85 is inserted into the discharge through hole 84.

In the above embodiment, specifically, the upper left end of the sealing plug 85 is glued with a hand strap 851; the sealing plug 85 is a conical rubber plug; the hand strap 851 is specifically made of a nylon cloth tape.

In the above embodiment, specifically, the moving wheel 1 specifically adopts a rubber universal wheel with a brake pad; the number of the moving wheels 1 is four.

In the above embodiment, specifically, the protective sleeve 4 specifically adopts a cylindrical silica gel sleeve; the observation window 11 is a tempered glass window with the thickness of five to eight millimeters.

In the above embodiment, specifically, the soldering station 17 specifically uses a circular stainless steel disc.

In the above embodiment, specifically, the connecting pipe 62 specifically adopts a stainless steel pipe with an internal thread; the inner surface of the connecting pipe 62 is glued with a rubber layer; the connecting pipe 62 is screwed at the lower end of the nitrogen gas guide pipe 14.

In the above embodiment, specifically, the air-jet coil 61 is glued to the lower surface of the protective cover 71; the protective cover 71 is a transparent PVC plastic cover with openings at the front and lower parts.

In the above embodiment, specifically, the liquid nitrogen storage tank 12 is communicated with the inside of the gas injection coil 61 through the nitrogen guiding pipe 14.

In the above embodiment, specifically, the waste residue collecting hopper 81 is screwed to the lower portion of the protective cover 71.

In the above embodiment, specifically, the exhaust fan 73 and the electromagnetic valve 64 are respectively electrically connected to the control switch 13; the exhaust fan 73 is a fan with the model number of H300-3; the electromagnetic valve 64 is a type M5 electromagnetic valve; the pressure gauge 10 is a pressure gauge with the model number of Y100; the liquid nitrogen storage tank 12 is a storage tank with model number of YDD-1800.

Principle of operation

In the utility model, hold lag 4 and hand push handle 3, promote liquid nitrogen storage box 12 under the effect of removing wheel 1, remove this protector to needs the soldering machine that uses by, place the material that needs the welding on the upper portion of soldering platform 17, carry out welding operation in the inside of protecting shield body 71, adjust the size of adjusting valve 15 in this process, make the nitrogen gas in the liquid nitrogen storage box 12 enter into jet-propelled coil 61 and connecting pipe 62 through nitrogen gas guide pipe 14, and spout the welding material surface through gas honeycomb duct 63, play the effect of preventing oxidation, and control corresponding solenoid valve 64 through control switch 13 and carry out jet-propelled protection operation; in the process, the waste residues generated by welding fall into the waste residue collecting hopper 81, the sealing plug 85 is pulled out from the discharge through hole 84 by regularly holding the hand strap 851 by hands, and the waste residues are discharged into a specified container through the discharge through hole 84 by using a cleaning tool; the control switch 13 controls the operation of the exhaust fan 73 to play a role in ventilation and exhaust, and the shielding plate 74 plays a role in shielding and sealing when exhaust is not needed, so that overflow of nitrogen is prevented, and the utilization rate of nitrogen is improved.

Utilize technical scheme, or technical personnel in the field are in the utility model discloses under technical scheme's the inspiration, design similar technical scheme, and reach above-mentioned technological effect, all fall into the utility model discloses a protection scope.

Claims (10)

1. The nitrogen filling protection device for the wave soldering furnace with good protection performance is characterized by comprising a moving wheel (1), a supporting base (2), a hand-push handle (3), a protection sleeve (4), a supplement pipe (5), a nitrogen guide pipe structure (6) capable of shunting, a smoke exhaust protection cover structure (7), a welding slag collecting hopper structure (8) convenient to clean, a supplement valve (9), a pressure gauge (10), an observation window (11), a liquid nitrogen storage box (12), a control switch (13), a nitrogen guide pipe (14), an adjusting valve (15), a support rod (16) and a soldering table (17), wherein the moving wheel (1) is respectively bolted at four corners of the lower surface of the supporting base (2); the hand push handle (3) is connected to the upper part of the left side of the liquid nitrogen storage box (12) through a screw; the protective sleeve (4) is sleeved in the middle of the outer surface of the hand push handle (3); the replenishing pipe (5) is embedded at the left side position of the upper surface of the liquid nitrogen storage box (12); the supplement valve (9) is in threaded connection with the middle position of the upper surface of the supplement pipe (5); the distributable nitrogen guide pipe structure (6) is arranged at the lower part of the nitrogen guide pipe (14); the smoke-discharging protective cover structure (7) is arranged at the rear part of the nitrogen guide pipe structure (6) capable of shunting; the welding slag collecting hopper structure (8) convenient to clean is arranged at the lower part of the smoke exhaust protective cover structure (7); the observation window (11) is embedded in the middle of the upper part of the front surface of the liquid nitrogen storage box (12); the pressure gauge (10) is in threaded connection with the middle position of the upper surface of the liquid nitrogen storage tank (12); the control switch (13) is embedded in the right upper side of the front surface of the liquid nitrogen storage box (12); the liquid nitrogen storage tank (12) is connected to the upper surface of the supporting base (2) through bolts; the nitrogen guide pipe (14) is embedded at the right side position of the upper surface of the liquid nitrogen storage tank (12); the adjusting valve (15) is in threaded connection with the right side position of the upper surface of the nitrogen guide pipe (14); one end of the supporting rod (16) is inserted in the welding slag collecting hopper structure (8) which is convenient to clean, and the other end of the supporting rod is respectively connected to the four corners of the lower surface of the soldering station (17) through screws; the distributable nitrogen guide pipe structure (6) comprises an air injection coil pipe (61), a connecting pipe (62), a gas guide pipe (63), an electromagnetic valve (64) and an anti-overflow cover (65), wherein the connecting pipe (62) is welded in the middle of the upper surface of the air injection coil pipe (61) and is communicated with the inside of the air injection coil pipe (61); the gas guide pipe (63) is in threaded connection with the lower surface of the gas spraying coil pipe (61) and is communicated with the inside of the gas spraying coil pipe (61); the electromagnetic valve (64) is embedded in the upper side position inside the gas guide pipe (63); the anti-overflow cover (65) is sleeved at the lower part of the outer surface of the gas guide pipe (63).

2. The nitrogen-filled protection device of the wave soldering furnace with good protection performance as claimed in claim 1, wherein the smoke exhaust protection cover structure (7) comprises a protection cover body (71), an exhaust through hole (72), an exhaust fan (73), a shielding plate (74) and a fixed sleeve (75), wherein the exhaust through hole (72) is respectively arranged at the upper positions of the left side and the right side of the protection cover body (71); the exhaust fan (73) is embedded in the exhaust through hole (72); the shielding plate (74) is movably inserted in the fixed sleeve (75) and is positioned outside the exhaust through hole (72); the fixed sleeves (75) are respectively glued at the upper parts of the left side and the right side of the protective cover body (71).

3. The nitrogen-filled protection device of the wave soldering tin furnace with good protection performance as claimed in claim 1, wherein the welding slag collecting hopper structure (8) convenient to clean comprises a slag collecting hopper (81), a hand-held handle (82), a fixing clamping groove (83), a discharge through hole (84) and a sealing plug (85), wherein the hand-held handle (82) is in screw connection with the middle position of the left side of the slag collecting hopper (81); the fixed clamping grooves (83) are respectively arranged at the four corners of the inner lower surface of the waste residue collecting hopper (81); the discharge through hole (84) is formed in the right side of the lower surface inside the waste residue collecting hopper (81); the sealing plug (85) is inserted in the discharge through hole (84).

4. A highly protective nitrogen-filled protection device for a wave soldering furnace as claimed in claim 3, wherein the upper left end of the sealing plug (85) is glued with a hand strap (851); the sealing plug (85) is a conical rubber plug; the hand strap (851) is specifically made of a nylon cloth tape.

5. The nitrogen-filled protection device of the wave soldering furnace with good protection performance as claimed in claim 1, characterized in that the moving wheel (1) is a rubber universal wheel with a brake pad; the number of the moving wheels (1) is four.

6. The nitrogen-filled protection device with good protection performance for the wave soldering furnace as claimed in claim 1, wherein the protection sleeve (4) is a cylindrical silica gel sleeve; the observation window (11) adopts a toughened glass window with the thickness of five to eight millimeters.

7. The nitrogen-filled protection device of the wave soldering furnace with good protection performance as claimed in claim 1, wherein the connecting pipe (62) is a stainless steel pipe with internal threads; the inner surface of the connecting pipe (62) is glued with a rubber layer; the connecting pipe (62) is in threaded connection with the lower end of the nitrogen guide pipe (14).

8. The nitrogen-filled protection device of the wave soldering tin furnace with good protection performance as claimed in claim 2, wherein the air-jet coil pipe (61) is glued on the lower surface of the protection cover body (71); the protective cover body (71) is a transparent PVC plastic cover with openings at the front part and the lower part.

9. The nitrogen-filled protection device of a wave soldering furnace with good protection performance as claimed in claim 1, wherein the soldering table (17) is a circular stainless steel plate.

10. The nitrogen-filled protection device of a wave soldering furnace with good protection performance as claimed in claim 1, wherein the liquid nitrogen storage tank (12) is communicated with the inside of the gas spraying coil pipe (61) through a nitrogen guiding pipe (14).

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