CN211903542U - Drying device for printed circuit board - Google Patents

Abstract

The utility model discloses a drying device of a printed circuit board, which belongs to the field of printed circuit board manufacturing and comprises a baking oven, a circulating hot air system and a carrying structure; the two ends of the baking box are provided with support legs for supporting the baking box, a carrying structure for carrying the printed circuit board to enter and exit the baking box is arranged in the baking box in a penetrating way, a circulating hot air system is arranged below the baking box, and the circulating hot air system is connected with an air outlet pipe arranged at the top of the baking box; the utility model provides a printed circuit board's drying device toasts printed circuit board through adopting even hot-blast, prevents the inhomogeneous condition of heat to be connected with circulating hot air system's air inlet through the outlet duct that will toast the case, avoid with the outer heat loss that leads to of hot-blast discharge drying device, reduced the energy consumption of resistance wire heating box, thereby toast the preparation manufacturing cost who has reduced printed circuit board again under the even prerequisite of guaranteeing to toast the quality of heat.

Description

Drying device for printed circuit board

Technical Field

The utility model relates to a printed circuit board makes the field, especially relates to a printed circuit board's drying device.

Background

In the manufacturing process of the printed circuit board, the liquid material on the circuit board needs to be dried, and in the drying process, due to the complex structure of the printed circuit board, the liquid material needs to be baked for a long time, and the temperature needs to be relatively uniform, so that the printed circuit board is prevented from being damaged due to overhigh local temperature. To date, the scheme that adopts the mode of fan blast air to make the temperature homogenization of baking in the case has been proposed in patent document CN204165351U to set up the air outlet at the top, but because a large amount of heats of baking in the case can be taken away to the effect of fan blast air, thereby in order to maintain the baking in the case temperature be in certain level, guarantee the efficiency of toasting, the heating structure of baking in the case needs continuous heating, thereby has improved drying device's power consumption by a wide margin, so lead to printed circuit board's cost of manufacture to promote by a wide margin.

SUMMERY OF THE UTILITY MODEL

In order to overcome prior art, printed circuit board's drying device power consumption is higher, leads to the higher defect of printed circuit board's cost of manufacture, the utility model aims to solve the problem that a printed circuit board's drying device still need have lower energy consumption under having the even prerequisite of stoving heat to reduce printed circuit board's preparation manufacturing cost.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a drying device of a printed circuit board, which comprises a baking box, a circulating hot air system and a carrying structure;

the two ends of the baking box are provided with support legs for supporting the baking box, the conveying structure for conveying the printed circuit board to enter and exit the baking box is arranged in the baking box in a penetrating mode, the circulating hot air system is arranged below the baking box, and the circulating hot air system is connected with an air outlet pipe arranged at the top of the baking box;

the circulating hot air system comprises an air inlet pipe, a booster fan, a resistance wire heating box, a hot air pipe and a hot air box;

the air inlet pipe is connected with the air outlet pipe, the booster fan is connected above the air inlet pipe, the resistance wire heating box is connected above the booster fan, the resistance wire heating box is communicated with the hot air box through the hot air pipe, and the hot air box is communicated with the baking box.

Preferably, a mesh screen for preventing sundries from falling into the hot air box is arranged at the connecting position of the hot air box and the baking box.

Preferably, the surfaces of the baking box, the circulating hot air system and the air outlet pipe are provided with heat insulation materials.

Preferably, the oven adopts a sealing structure, and the two ends of the oven are provided with doors which are opened and closed at regular time and are convenient for the carrying structure to carry the printed circuit board.

Preferably, the carrying structure comprises a conveying chain and a fixing structure arranged on the conveying chain;

the fixed knot constructs including being parallel to each other and perpendicular to the left branch and the right branch of conveying chain, and connect the left branch with the connecting rod of right branch, the left branch with be provided with on the right branch and be used for the anchor clamps of fixed printed circuit board.

Preferably, a temperature sensor is also included;

the internal surface bottom of toasting the case is provided with and is used for the control toast the temperature sensor of temperature in the case.

Preferably, the temperature sensor is electrically connected with the circulating hot air system.

The utility model has the advantages that:

the utility model provides a drying device of printed circuit board, through adopting the combination use of resistance wire heating box and booster fan, thereby use even hot-blast to toast printed circuit board, prevent to toast the uneven circumstances that damages printed circuit board that the heat appears, and through connecting the outlet duct of toasting the case with the air inlet of circulating hot air system, thereby make the hot-blast that is sent by resistance wire heating box and booster fan combination can enter toasting the incasement constantly, improve toasting efficiency, and hot-blast is discharged the bellows via the outlet duct and is entered resistance wire heating box by the air inlet of circulating hot air system, thereby make the heat in the hot-blast of discharging toasting the case can recycle, avoid directly discharging hot-blast outside drying device and the heat that leads to run off, through using the discharged hot-blast as the air source of circulating hot air system, the temperature of the initial air in the resistance wire heating box is improved, and the energy consumption of the resistance wire heating box is reduced, so that the manufacturing and production cost of the printed circuit board is reduced on the premise that the baking heat quantity is uniform and the baking quality is guaranteed.

Drawings

Fig. 1 is a schematic structural view of a drying device for a printed circuit board according to the present invention;

fig. 2 is a schematic structural view of a hot air box in the drying device of the printed circuit board and a mesh screen at the joint of the baking box.

In the figure:

1. a baking oven; 2. a circulating hot air system; 3. a carrying structure; 4. an air outlet pipe; 5. a temperature sensor; 11. a support leg; 20. an air inlet pipe; 21. a booster fan; 22. a resistance wire heating box; 23. a hot air pipe; 24. a hot air box; 31. a fixed structure; 32. a conveyor chain; 311. a left strut; 312. a connecting rod; 313. and a right support rod.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

As shown in fig. 1 to 2, the drying apparatus for printed circuit boards provided in this embodiment includes a baking oven 1, a circulating hot air system 2, and a carrying structure 3; the two ends of the baking oven 1 are provided with support legs 11 for supporting the baking oven 1, a carrying structure 3 for carrying the printed circuit board to enter and exit the baking oven 1 is arranged in the baking oven 1 in a penetrating way, a circulating hot air system 2 is arranged below the baking oven 1, and the circulating hot air system 2 is connected with an air outlet pipe 4 arranged at the top of the baking oven 1; through being connected circulating hot air system 2 with outlet duct 4 for in can entering into baking oven 1 via circulating hot air system 2 again from outlet duct 4 exhaust hot-blast, prevent hot-blast direct discharge drying device and the heat that causes runs off, improve thermal utilization ratio, reduce the energy consumption.

The circulating hot air system 2 comprises an air inlet pipe 20, a booster fan 21, a resistance wire heating box 22, a hot air pipe 23 and a hot air box 24; the air inlet pipe 20 is connected with the air outlet pipe 4, the booster fan 21 is connected above the air inlet pipe 20, the resistance wire heating box 22 is connected above the booster fan 21, the resistance wire heating box 22 is communicated with the hot air box 24 through the hot air pipe 23, and the hot air box 24 is communicated with the baking box 1. Intake pipe 20 will be sent into booster fan 21 by the hot-blast of outlet duct 4 exhaust in, and carry to resistance wire heating box 22 in by booster fan 21's effect, the function through the resistance wire heating in the resistance wire heating box 22 improves hot-blast temperature, and then toast 1 baking box and toast printed circuit board via hot-blast main 23 and hot-blast case 24 entering, wherein hot-blast case 24 is the funnel type, the hot-blast case 24 that adopts this kind of shape is for the convenience of getting into baking box 1 hot-blast can scatter fast, prevent the too high phenomenon of local temperature, improve the homogeneity of toasting. In order to prevent the humidity of the hot air from being too high, a drying device for drying is further provided between the air outlet pipe 4 and the air inlet pipe 20.

In order to prevent that the debris in the baking oven 1 from falling into inside the hot-blast case 24, further, the hookup location of hot-blast case 24 and baking oven 1 is provided with the mesh screen that is used for preventing the debris from falling into the hot-blast case 24, through the separation effect of mesh screen, can avoid debris to block up the hot-blast case 24, improves the stability of device operation.

In order to reduce the heat loss caused by the heat dissipation from the wall of the device, further, the surfaces of the baking box 1, the circulating hot air system 2 and the air outlet pipe 4 are all provided with heat insulation materials, and specifically, heat insulation cotton or foam can be adopted to wrap the surface of the device, so that the heat dissipation is reduced, the heat insulation effect of the device is improved, the energy consumption is further reduced, and the manufacturing cost of the printed circuit board is saved.

In order to avoid the outflow of the access & exit department of hot-blast follow roast case 1 both ends handling device, furtherly, roast case 1 adopts seal structure, the both ends of toasting case 1 are provided with regularly opening and shutting and are convenient for transport structure 3 and carry printed circuit board's chamber door, through the chamber door that adopts automatic control, when the fixed knot who is fixed with printed circuit board constructs 31 and needs to come in and go out toast case 1, the chamber door is automatic to be opened so that fixed knot constructs 31 and come in and go out, treat that fixed knot constructs 31 accomplishes and come in and go out toast case 1 back, the chamber door is closed immediately and is made toast case 1 and be in relative inclosed state, prevent heat loss, the heat preservation effect of.

Further, the handling structure 3 comprises a conveying chain 32 and a fixing structure 31 arranged on the conveying chain 32; the fixing structure 31 includes a left support bar 311 and a right support bar 313 parallel to each other and perpendicular to the conveying chain 32, and a connecting rod 312 connecting the left support bar 311 and the right support bar 313, and clamps for fixing the printed circuit board are disposed on the left support bar 311 and the right support bar 313. The connecting rod 312 is used for fixing the left support rod 311 and the right support rod 313, and the printed circuit board is suspended and fixed by the clamp arranged on the left support rod 311 and the right support rod 313, so that most surfaces of the printed circuit board can be in contact with hot air, and the baking effect is improved.

In order to control the temperature in the baking oven 1 and prevent the printed circuit board from being damaged due to overhigh temperature in the baking oven 1, the baking oven further comprises a temperature sensor 5; the internal surface bottom of toasting case 1 is provided with the temperature sensor 5 that is used for the control to toast the interior temperature of case 1, toast case 1 temperature through temperature sensor 5 alright with accurate detection.

For the convenience of control toasts the temperature in the case 1 at suitable level, furtherly, temperature sensor 5 and 2 electric connection of circulating hot air system, the temperature that measures through temperature sensor 5 contrasts with the settlement temperature, when toasting in the case 1 actual temperature and being higher than the setting value temperature, control system automatic disconnection resistance wire heating box 22's power, resistance wire heating box 22 is not producing heat, make toast the interior temperature of case 1 and reduce, when toasting in the case 1 actual temperature and being lower than the setting value temperature, control system automatic closed resistance wire heating box 22's power, resistance wire heating box 22 produces heat, make toast the interior temperature of case 1 and rise. Thereby making the whole negative feedback adjustment structure and realizing the automatic control of the temperature in the baking oven 1 at a proper level.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. The present invention is not to be limited by the specific embodiments disclosed herein, and other embodiments that fall within the scope of the claims of the present application are intended to be within the scope of the present invention.

Claims (7)

1. The utility model provides a drying device of printed circuit board which characterized in that:

comprises a baking box (1), a circulating hot air system (2) and a carrying structure (3);

supporting legs (11) used for supporting the baking box (1) are arranged at two ends of the baking box (1), the carrying structure (3) used for carrying a printed circuit board to enter and exit the baking box (1) is arranged in the baking box (1) in a penetrating mode, the circulating hot air system (2) is arranged below the baking box (1), and the circulating hot air system (2) is connected with an air outlet pipe (4) arranged at the top of the baking box (1);

the circulating hot air system (2) comprises an air inlet pipe (20), a booster fan (21), a resistance wire heating box (22), a hot air pipe (23) and a hot air box (24);

the air inlet pipe (20) is connected with the air outlet pipe (4), the booster fan (21) is connected above the air inlet pipe (20), the resistance wire heating box (22) is connected above the booster fan (21), the resistance wire heating box (22) is communicated with the hot air box (24) through the hot air pipe (23), and the hot air box (24) is communicated with the baking box (1).

2. The drying apparatus of a printed circuit board according to claim 1, wherein:

the connecting position of the hot air box (24) and the baking box (1) is provided with a mesh screen for preventing sundries from falling into the hot air box (24).

3. The drying apparatus of a printed circuit board according to claim 1, wherein:

the surface of the baking oven (1) and the surface of the circulating hot air system (2) and the surface of the air outlet pipe (4) are both provided with heat insulation materials.

4. The drying apparatus of a printed circuit board according to claim 1, wherein:

toast case (1) and adopt seal structure, the both ends of toasting case (1) are provided with regularly to open and shut and are convenient for carry structure (3) and carry printed circuit board's chamber door.

5. The drying apparatus of a printed circuit board according to claim 1, wherein:

the carrying structure (3) comprises a conveying chain (32) and a fixing structure (31) arranged on the conveying chain (32);

fixed knot constructs (31) including being parallel to each other and perpendicular to left branch pole (311) and right branch pole (313) of conveying chain (32) and connect left branch pole (311) with connecting rod (312) of right branch pole (313), left branch pole (311) with be provided with the anchor clamps that are used for fixed printed circuit board on right branch pole (313).

6. The drying apparatus of a printed circuit board according to claim 1, wherein:

also comprises a temperature sensor (5);

the internal surface bottom of toasting case (1) is provided with and is used for the control toast incasement (1) internal temperature sensor (5).

7. The drying apparatus of the printed circuit board according to claim 6, wherein:

the temperature sensor (5) is electrically connected with the circulating hot air system (2).

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