CN115815085A

CN115815085A - PCB baking device

Info

Publication number: CN115815085A
Application number: CN202211459499.3A
Authority: CN
Inventors: 李荣根; 佘敏辉
Original assignee: Shenzhen Ruirong Automation Co ltd
Current assignee: Shenzhen Ruirong Automation Co ltd
Priority date: 2022-11-16
Filing date: 2022-11-16
Publication date: 2023-03-21
Anticipated expiration: 2042-11-16
Also published as: CN115815085B

Abstract

The application relates to a PCB baking device, which comprises an oven, wherein the oven comprises an oven body, a hot air pipeline, a blower, a heater, an exhaust gas pipeline and a first filter; a tunnel type baking channel is arranged in the box body, an air inlet is arranged at the bottom of the box body, and an air valve is arranged on the air inlet; the hot air pipeline is positioned on the side of the baking channel, the lower end of the hot air pipeline extends to the lower part of the baking channel, and the upper end of the hot air pipeline extends to the upper part of the baking channel; the wind wheel of the blower is positioned in the box body, so that airflow flowing from the lower end to the upper end is formed in the hot air pipeline; the air inlet end of the waste gas pipeline extends to the lower part of the baking channel, and the air outlet end of the waste gas pipeline is provided with a vent valve; the first filter is arranged on the box body and positioned above the baking channel, and the upper end of the hot air pipeline is communicated with the first filter; the heater is arranged at the air inlet at the lower end of the hot air pipeline. In this application, fresh air directly gets into hot-blast main internal heating circulation after the heating of heater, improves and toasts efficiency, reduces thermal scattering and disappearing to reduce and toast the energy consumption.

Description

PCB baking device

Technical Field

The application relates to the technical field of PCB board processing equipment, in particular to a PCB board baking device.

Background

Generally, when parts on a circuit board are embedded, solder mask treatment is firstly carried out on the circuit board, namely solder mask ink is coated on the parts, which do not need to be attached with soldering tin, on the circuit board in advance, and the circuit board coated with the solder mask ink needs to be baked, so that the surface of the ink is dried, and the ink is rapidly formed. The circuit board is baked by using an oven, generally, harmful gases of soldering tin and printing ink are generated, the generated harmful gases are difficult to discharge, and the staff can cause bad influence on the body if breathing the harmful gases for a long time. Although harmful gas suction and treatment equipment is arranged outside the existing baking device for the solder mask ink of the circuit board, a large amount of heat is sucked away along with the harmful gas suction and treatment equipment, so that the power consumption is obviously increased.

Disclosure of Invention

In order to reduce the loss of heat and reduce the baking energy consumption, the application provides a PCB board baking device.

The application provides a PCB board baking equipment adopts following technical scheme:

a PCB baking apparatus, comprising:

the baking oven comprises an oven body, wherein a tunnel type baking channel is arranged in the oven body, an air inlet is arranged at the bottom of the oven body, and an air valve is arranged on the air inlet;

the hot air pipeline is positioned on the side of the baking channel, the lower end of the hot air pipeline extends to the lower part of the baking channel, and the upper end of the hot air pipeline extends to the upper part of the baking channel;

the wind wheel of the blower is positioned in the box body, so that airflow flowing from the lower end to the upper end is formed in the hot air pipeline;

the air inlet end of the waste gas pipeline extends to the lower part of the baking channel, and the air outlet end of the waste gas pipeline is provided with a vent valve;

the first filter is arranged on the box body and positioned above the baking channel, and the upper end of the hot air pipeline is communicated with the first filter; and the number of the first and second groups,

and the heater is arranged at an air inlet at the lower end of the hot air pipeline and is used for heating the air flow at the lower end of the hot air pipeline.

By adopting the technical scheme, the PCB is continuously conveyed to the baking channel, the heater and the air blower are started, the air flow in the box body is heated by the heater, then flows to the upper end from the lower end of the hot air pipeline, and then flows back into the hot air pipeline from top to bottom in the box body, harmful gas can be generated in the heating process, and the content of the harmful gas in the box body can be reduced by filtering the air flow through the first filter in the circulating process, so that the box body is kept in a hot air clean state, and the hot air is recycled. Through opening the vent valve that exhaust pipe said to give vent to anger and hold, can the exhaust part harmful gas, through the blast gate of opening the box air inlet, can mend fresh air, prevent that there is the potential safety hazard in the too high existence of harmful gas concentration in the box. Through being provided with the air-blower, fresh air directly gets into hot-blast main internal heating circulation after the heating of heater, improves and toasts efficiency, avoids causing the interference to the temperature in the box simultaneously to reduce and toast the energy consumption.

Optionally, install the ventilating board in the box, the ventilating board top does toast the passageway.

Through adopting above-mentioned technical scheme, when the PCB board the centre gripping unstability and when the condition that drops, the PCB board can drop to the ventilating board on, prevent that the PCB board from dropping to the heater on, can play the guard action to the PCB board.

Optionally, still include the funnel, the funnel install in the bottom half, toast the passageway with the inside intercommunication of funnel, the funnel bottom with exhaust gas piping's inlet end intercommunication, the funnel lateral wall runs through and is equipped with the through-hole, the air intake department that hot-blast main was equipped with the through-hole department that the funnel was equipped with is connected, the funnel lateral wall upper end runs through and is equipped with the vent, the air intake department that the bottom half was equipped with the vent department that is equipped with on the funnel communicates through the pipeline.

By adopting the technical scheme and the arrangement of the funnel, a part of hot air enters the waste gas pipeline through the bottom of the funnel, the other part of hot air enters the air inlet of the hot air pipeline through the through hole to be further heated, and then the hot air circulates in the box body, so that the hot air is concentrated in the funnel and then distributed, and the hot air in the box body is favorably shunted.

Optionally, a filter cover is installed at the through hole of the funnel, and the heater is located below the filter cover.

Through adopting above-mentioned technical scheme, through being equipped with the filter mantle, can play the dust removal effect to the air, avoid the debris of large granule directly to enter into the heater in, can play the guard action to the heater.

Optionally, still include the drainage plate, the drainage plate is along upper and lower to extending, and follows the extending direction who toasts the passageway extends, the drainage plate upper end is fixed in the box, the drainage plate lower extreme with toast the bottom interval of passageway, the drainage plate side has a plurality of vertical spaced bosss, just the section of boss is the sugarcoated haw form.

Through adopting above-mentioned technical scheme, steam from the top down flow in-process in the box, some steam is from the direct downflow in the clearance between PCB board and the drainage board, another part steam flows along the boss of drainage board, can collide with PCB board side, first aspect, can avoid the direct downflow of steam between two adjacent PCB boards to flow away, the contact dynamics of steam with PCB board upper end has been increased, the steam that flows downwards simultaneously and the steam that collides with PCB board collect, can produce the turbulent flow, the contact time of steam with PCB upper end has been increased, thereby can improve the heating temperature of PCB board upper end, improve the homogeneity of PCB board heating. In the second aspect, the heating time of the upper end of the PCB panel can be shortened, so that the heating efficiency of the entire PCB panel can be improved. The third aspect, before the printing ink stoving on the PCB board, because the PCB board is vertical placing, the printing ink on the PCB board has the condition of downwards slowly dripping, can make the PCB board have the inhomogeneous condition of printing ink thickness, through setting up the drainage plate for partial steam can collide with the PCB board, can reduce the degree that the printing ink drips, improves the degree of consistency of printing ink on the PCB board, thereby can improve the quality of PCB board.

Optionally, the projection degree of the plurality of bosses from top to bottom is gradually reduced.

Through adopting above-mentioned technical scheme, the part temperature that the distance is big more with the heater on the PCB board can be more less, and the temperature of PCB board is from the top down crescent, and consequently, the protruding degree of boss of top is great for hot-blast intensity of striking to the PCB board of PCB board upper end is big more, contact time is longer, can further improve PCB heating temperature's homogeneity.

Optionally, the drainage plate is equipped with a plurality ofly, and is a plurality of the drainage plate interval sets up, and is adjacent form the passageway that the PCB board that supplies to wait to toast passes through between the drainage plate.

By adopting the technical scheme, the baking quality of a plurality of PCB boards can be improved simultaneously.

Optionally, the baking device further comprises a plurality of fixing rods, the fixing rods are perpendicular to the drainage plates, the fixing rods are arranged in the extending direction of the baking channel at intervals, and the upper ends of the drainage plates are fixedly connected with the fixing rods.

Through adopting above-mentioned technical scheme, the installation of the drainage plate of being convenient for reduces the influence that causes the circulation of steam in the box simultaneously.

Optionally, the oven is provided with a plurality of ovens, the ovens are sequentially and continuously arranged in the extending direction of the baking channel, and a temperature sensor is arranged in each oven.

By adopting the technical scheme, the energy consumption of the baking device can be reduced, and the influence on the quality of the PCB due to the excessive baking of the PCB can be avoided.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the heater and the blower are started, and the air flow is filtered by the first filter in the circulating process, so that the content of harmful gas in the box body can be reduced, the box body is kept in a hot air clean state, and the hot air is recycled. The vent valve on the exhaust end of the exhaust pipeline is opened, partial harmful gas can be discharged, fresh air can be supplemented through the air valve for opening the air inlet of the box body, and potential safety hazards caused by the fact that the concentration of the harmful gas in the box body is too high are prevented. Through being provided with the air-blower, fresh air directly gets into hot-blast main internal heating circulation after the heating of heater, improves and toasts efficiency, avoids causing the interference to the temperature in the box simultaneously to reduce and toast the energy consumption.

2. The funnel is arranged, so that a part of hot air enters the waste gas pipeline through the bottom of the funnel, the other part of hot air enters the air inlet of the hot air pipeline through the through hole to be further heated, and then the hot air circulates in the box body, so that the hot air is concentrated in the funnel and then distributed, and the hot air in the box body is favorably divided.

3. The arrangement of the drainage plate can improve the heating temperature of the upper end of the PCB and improve the heating uniformity of the PCB; the heating time of the upper end of the PCB can be shortened, so that the heating efficiency of the whole PCB can be improved; the uniformity of the printing ink on the PCB can be improved, and the quality of the PCB can be improved.

Drawings

FIG. 1 is a schematic structural diagram of a baking apparatus for PCB boards in embodiment 1 of the present application;

FIG. 2 is a schematic cross-sectional view of the baking apparatus for PCB board in FIG. 1;

FIG. 3 is a schematic view of the PCB baking apparatus (without the ventilation board) of FIG. 1;

FIG. 4 is a schematic view showing the construction of a hot air duct, a heater and a first filter of FIG. 1;

FIG. 5 is a schematic view of the exhaust duct and funnel of FIG. 1;

FIG. 6 is a schematic cross-sectional view of a PCB baking apparatus and a PCB in embodiment 2 of the present application;

fig. 7 is a partially enlarged schematic view of the flow-guide plate and the PCB of fig. 6.

Description of reference numerals: 100. an oven; 1. a box body; 1a, baking a channel; 2. a hot air duct; 3. a blower; 4. a heater; 5. an exhaust gas conduit; 6. a first filter; 7. a ventilation board; 8. a funnel; 8a, a through hole; 9. a filter housing; 10. a drainage plate; 101. a boss; 101a, an upper side wall of the boss; 11. fixing the rod; 200. and (7) a PCB board.

Detailed Description

The present application is described in further detail below with reference to figures 1-7.

Example 1

The embodiment of the application discloses PCB board baking equipment. The PCB board baking apparatus includes an oven 100, and the oven 100 includes a case 1, a hot air duct 2, a blower 3, a heater 4, an exhaust gas duct 5, and a first filter 6.

Referring to fig. 1, a tunnel type baking channel 1a is provided in a box 1, a conveying mechanism is used to continuously convey a PCB 200 into the baking channel 1a, the PCB 200 is dried in the box 1 and then continuously conveyed out of the box 1, and thus the PCB 200 can be continuously dried.

The box body 1 is internally provided with the ventilating plate 7, the baking channel 1a is arranged above the ventilating plate 7, the PCB 200 is transmitted above the ventilating plate 7, when the conveying mechanism clamps the PCB 200 unstably and the PCB 200 falls, the PCB 200 can fall onto the ventilating plate 7, and the PCB 200 can be protected.

Referring to fig. 2 and 3, the hot air duct 2 is located on the side of the baking channel 1a, the hot air duct 2 can be located outside the box body 1, and the hot air duct 2 is arranged in the box body 1 in this embodiment, so that the integration level of the baking device is improved, and the heat loss of the baking device is reduced. The lower end of the hot air duct 2 extends to the lower part of the baking channel 1a, and the upper end extends to the upper part of the baking channel 1 a.

The wind wheel of the blower 3 is positioned in the box body 1, so that the air flow flowing from the lower end to the upper end is formed in the hot air pipeline 2. The heater 4 is arranged at the air inlet at the lower end of the hot air pipeline 2 and used for heating the air flow at the lower end of the hot air pipeline 2. And the blower 3 is started, so that the heater 4 heats the air flow before the air flow enters the hot air pipeline 2, the heated air flow flows to the upper end through the lower end of the hot air pipeline 2, then flows downwards to the lower part from the upper part of the box body 1, and is heated by the heater 4 for circulation.

The inlet end of waste gas pipeline 5 extends to toast passageway 1a below, and waste gas pipeline 5 gives vent to anger to serve and is equipped with the breather valve, and PCB board 200 can produce harmful gas in the heating process, if the too high potential safety hazard that can cause of harmful gas's concentration in box 1. The ventilation valve is opened, partial hot air can be discharged outwards, meanwhile, fresh air is supplemented, and the content of harmful gas in the box body 1 can be controlled in a safe range.

The exhaust fan can be arranged at the air outlet end of the waste gas pipeline 5, the hot gas containing the harmful gas in the box body 1 can be actively and stably pumped out of the box body 1, the exhaust fan and the vent valve are arranged, the discharge amount of the hot gas can be adjusted according to the content of the harmful gas in the box body 1, the leakage of the harmful gas is reduced, and the pollution to the surrounding environment is reduced. The end of giving vent to anger of exhaust gas pipeline 5 can be connected with exhaust treatment device, realizes the collection and the processing to harmful gas, avoids harmful gas directly to arrange to the air in.

The first filter 6 is arranged in the box body 1 and flows to the first filter 6 from the hot air pipeline 2 after being heated, and the content of harmful gas in hot air can be reduced through the filtering effect of the first filter 6.

The bottom of the box body 1 is provided with an air inlet, an air valve and a second filter are installed on the air inlet, the air valve is opened, external fresh air can enter the box body 1, and the second filter can play a role in dedusting and filtering the external air. By arranging the air valve, the amount of the fresh air to be supplied can be adjusted according to the discharge amount of hot air in the box body 1.

In an alternative embodiment, referring to fig. 4 and 5, a funnel 8 is installed at the bottom of the box 1, the baking channel 1a is communicated with the inside of the funnel 8, the bottom of the funnel 8 is communicated with the air inlet end of the waste gas pipe 5, a through hole 8a is formed through the side wall of the funnel 8, and an air inlet formed in the hot air pipe 2 is connected with the through hole 8a formed in the funnel 8. 8 lateral wall upper ends of funnel can run through and be equipped with the vent, and the air inlet department that is equipped with bottom box 1 and the vent department that is equipped with on the funnel 8 are through the pipeline intercommunication, can conduct outside fresh air to funnel 8 in, and are located heater 4 top, and fresh air reentries to hot-blast main 2 after the heating.

The funnel 8 is arranged, so that a part of hot air enters the waste gas pipeline 5 through the bottom of the funnel 8, the other part of hot air enters the air inlet of the hot air pipeline 2 through the through hole 8a to be further heated, and then the hot air circulates in the box body 1, so that the hot air is concentrated in the funnel 8 to be distributed, and the hot air in the box body 1 is shunted. Of course, in other embodiments, the funnel 8 may not be provided.

A filter cover 9 (see fig. 2) is attached to the through hole 8a of the funnel 8, and the heater 4 is located below the filter cover 9. Through being equipped with filter mantle 9, can play further dust removal effect to the air, avoid the debris of large granule to directly enter into in the heater 4, can play the guard action to heater 4.

Further, in an alternative embodiment, a plurality of toasters 100 may be provided, the plurality of toasters 100 being arranged in series in the extending direction of the toasting path 1a, and a temperature sensor being provided in each case 1 for monitoring the temperature in the case 1. The PCB board 200 is transmitted in the baking channel 1a of each oven 100 in sequence, the heater 4 is used for heating the inside of the oven 100, the temperature in the oven 100 can be controlled through monitoring of the temperature sensor, the temperature of the oven 100 is reduced in sequence in the extending direction of the baking channel 1a, the PCB board 200 is firstly conveyed into the oven 100 with the highest temperature, the energy consumption of the baking device can be reduced, and meanwhile, the quality of the PCB board 200 is prevented from being influenced by excessive baking of the PCB board 200.

The implementation principle of the PCB baking device in the embodiment of the application is as follows:

the PCB board 200 is continuously conveyed to the baking channel 1a by utilizing the conveying mechanism, the heater 4 and the blower 3 are started, the air flow in the box body 1 is heated by the heater 4, then flows from the lower end to the upper end of the hot air pipeline 2, and then flows back into the hot air pipeline 2 from top to bottom in the box body 1, harmful gas can be generated in the heating process, and the air flow is filtered by the first filter 6 in the circulating process, so that the content of the harmful gas in the air in the box body 1 can be reduced, the hot air in the box body 1 is kept in a clean state, and the recycling of the hot air is realized (the circulating direction can refer to the direction indicated by the arrow in figure 2). Through opening exhaust gas duct 5 and giving vent to anger the breather valve and the air exhauster of serving, can the exhaust part harmful gas, through the blast gate of opening the air inlet of box 1, can mend fresh air, prevent that the too high potential safety hazard of existence of harmful gas concentration in the box 1. Through being provided with air-blower 3, fresh air directly gets into hot-blast main 2 internal heating cycle after the heating of heater 4, improves and toasts efficiency, avoids causing the interference to the temperature in the box 1 simultaneously to reduce and toast the energy consumption.

Example 2

Referring to fig. 6 and 7, embodiment 2 is different from embodiment 1 in that a flow guide plate 10 is disposed in the box body 1, the flow guide plate 10 extends in the vertical direction and extends in the extending direction of the baking channel 1a, the upper end of the flow guide plate 10 is fixed in the box body 1, and in an alternative embodiment, the upper end of the flow guide plate 10 can be fixed at the bottom of the filter. The bottom interval of drainage plate 10 lower extreme and stoving passageway 1a, and be located between two PCB board 200 upper ends, drainage plate 10 has a plurality of vertical spaced bosss 101 towards the side of PCB board 200, and the section of boss 101 is the sugarcoated haw shape, and the quantity and the size of boss 101 can be according to the size setting of PCB board. When the PCB boards 200 are transported in the baking channel 1a, the upper ends of the two PCB boards 200 are always located at both sides of the lower end of the flow guide plate 10. The quantity of drainage plate 10 can be one, also can be a plurality of, and a plurality of drainage plate 10 intervals set up, and the interval direction is perpendicular with drainage plate 10, and each drainage plate 10's both sides all have a PCB board 200.

In an optional embodiment, be equipped with a plurality of dead levers 11 in the box 1, dead lever 11 is perpendicular with the drainage plate 10, and a plurality of dead levers 11 set up at the extending direction interval of toasting passageway 1a, and the upper end of a plurality of drainage plates 10 all with dead lever 11 fixed connection, the installation of the drainage plate 10 of being convenient for reduces the influence that causes the circulation of steam in the box 1 simultaneously.

Because the distance between the lower end of the PCB 200 and the heater 4 is smaller, and the distance between the upper end of the PCB 200 and the heater 4 is larger, when the PCB 200 is transmitted in the baking channel 1a, the heat radiation of the heater 4 to the lower end of the PCB 200 is larger, and the temperature of the upper end of the PCB 200 is lower than that of the lower end, so that the heating temperature of the PCB 200 is uneven, the corner of the PCB 200 is seriously warped, and the quality of the PCB 200 is influenced.

Through setting up the drainage plate 10, steam from the top down in-process that flows in box 1, some steam is from the direct downward flow in the clearance between PCB board 200 and drainage plate 10, another part steam flows along the boss 101 of drainage plate 10 (the direction of flow can refer to arrow point in figure 7), can collide with PCB board 200 side, on the one hand, can avoid the direct downward flow of steam between two adjacent PCB boards 200 to walk, the contact dynamics of steam and PCB board 200 upper end has been increased, simultaneously the steam that flows downwards collects with the steam that PCB board 200 collided, can produce the turbulent flow, the contact time of steam and PCB upper end has been increased, thereby can improve the heating temperature of PCB board 200 upper end, improve the homogeneity of PCB board 200 heating. In the second aspect, the heating temperature of the upper end of the PCB 200 is increased, and the heating time of the upper end of the PCB 200 can be shortened, so that the heating efficiency of the entire PCB 200 can be improved. The third aspect, before the stoving of the printing ink on PCB board 200, because PCB board 200 is vertical placing, there is the trend of downwards slowly dripping printing ink on the PCB board 200, can make PCB board 200 have the inhomogeneous condition of printing ink thickness, through setting up drainage plate 10 for partial steam can collide with PCB board 200, can reduce the degree that the printing ink drips, improves the degree of consistency of printing ink on the PCB board 200, thereby can improve PCB board 200's quality.

In an alternative embodiment, the upper sidewall of the boss 101 is concave, so that the hot air can flow along the sidewall of the boss 101, and the hot air can be promoted to impact the side surface of the PCB 200.

Further, optionally, the protruding degree of the plurality of bosses 101 from top to bottom is gradually decreased, the temperature of the portion of the PCB 200 that is farther from the heater 4 is decreased, and the temperature of the PCB 200 is gradually increased from top to bottom, so that the protruding degree of the upper boss 101 is larger, the impact strength of hot air at the upper end of the PCB 200 on the PCB 200 is higher, the contact time is longer, and the uniformity of the heating temperature of the PCB can be further improved. In an alternative embodiment, the flow guide plate 10 is hollow, and the boss 101 is used for guiding the air flow to the surface of the PCB board 200 to be baked, so that the mass of the flow guide plate 10 can be reduced, and the load on the box body 1 can be reduced.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A PCB board toasting apparatus comprising a toaster (100), the toaster (100) comprising:

the baking oven comprises a box body (1), wherein a tunnel type baking channel (1 a) is arranged in the box body (1), an air inlet is formed in the bottom of the box body (1), and an air valve is installed at the air inlet formed in the box body (1);

the hot air pipeline (2) is positioned on the side of the baking channel (1 a), the lower end of the hot air pipeline (2) extends to the lower part of the baking channel (1 a), and the upper end of the hot air pipeline extends to the upper part of the baking channel (1 a);

the wind wheel of the blower (3) is positioned in the box body (1) so as to form airflow flowing from the lower end to the upper end in the hot air pipeline (2);

the air inlet end of the waste gas pipeline (5) extends to the lower part of the baking channel (1 a), and the air outlet end of the waste gas pipeline (5) is provided with a vent valve;

the first filter (6) is arranged on the box body (1) and positioned above the baking channel (1 a), and the upper end of the hot air pipeline (2) is communicated with the first filter (6); and (c) a second step of,

and the heater (4) is arranged at an air inlet at the lower end of the hot air pipeline (2) and is used for heating the air flow at the lower end of the hot air pipeline (2).

2. The PCB board baking apparatus according to claim 1, wherein a ventilation board (7) is installed in the box body (1), and the baking channel (1 a) is above the ventilation board (7).

3. The PCB baking device of claim 1, further comprising a funnel (8), wherein the funnel (8) is installed at the bottom of the box body (1), the baking channel (1 a) is communicated with the inside of the funnel (8), the bottom of the funnel (8) is communicated with the air inlet end of the waste gas pipeline (5), a through hole (8 a) is formed in the side wall of the funnel (8) in a penetrating manner, the air inlet formed in the hot air pipeline (2) is connected with the through hole (8 a) formed in the funnel (8), a ventilation opening is formed in the upper end of the side wall of the funnel (8) in a penetrating manner, and the air inlet formed in the bottom of the box body (1) is communicated with the ventilation opening formed in the funnel (8) through a pipeline.

4. The PCB baking apparatus according to claim 3, wherein a filter cover (9) is installed at the through hole (8 a) of the funnel (8), and the heater (4) is located below the filter cover (9).

5. The PCB board baking device according to claim 1, further comprising a flow guide plate (10), wherein the flow guide plate (10) extends vertically and extends along the extending direction of the baking channel (1 a), the upper end of the flow guide plate (10) is fixed in the box body (1), the lower end of the flow guide plate (10) is spaced from the bottom of the baking channel (1 a), the side surface of the flow guide plate (10) is provided with a plurality of vertically spaced bosses (101), and the cross section of each boss (101) is in a shape of a sugarcoated haw.

6. The PCB baking apparatus of claim 5, wherein the plurality of bosses (101) are gradually decreased in the protrusion degree from the top to the bottom.

7. The PCB baking device according to claim 5, wherein a plurality of the flow guide plates (10) are arranged, the flow guide plates (10) are arranged at intervals, and a passage for the PCB (200) to be baked to pass is formed between the adjacent flow guide plates (10).

8. The PCB baking apparatus as claimed in claim 7, further comprising a plurality of fixing bars (11), wherein the fixing bars (11) are perpendicular to the flow guide plates (10), the plurality of fixing bars (11) are arranged at intervals in the extending direction of the baking channel (1 a), and the upper ends of the plurality of flow guide plates (10) are all fixedly connected with the fixing bars (11).

9. The PCB board baking apparatus according to any one of claims 1 to 8, wherein a plurality of said baking oven (100) is provided, a plurality of said baking ovens (100) are arranged in series in sequence in the extending direction of said baking path (1 a), and a temperature sensor is provided in each of said baking ovens (100).