CN102384641B - Drying system for flexible circuit board - Google Patents

Abstract

The invention provides a drying system for flexible circuit boards, comprising: two conveying devices, made of polytetrafluoroethylene material, including: an upper conveyor belt and a lower conveyor belt close to and parallel to each other; four rotating shafts, respectively It is arranged at both ends of the conveying device and is used to drive the transmission of the conveying belt; the deviation mechanism is arranged on the rotating shaft and used to adjust the tension of the upper conveying belt and the lower conveying belt; the hot air device is used for Blow hot air; the hot air device includes: a hot air blower and a hot air knife, connected with a hot air hose between the hot air blower and the hot air knife; Heater; cold wind device, is used for blowing out cold wind; Said cold wind device comprises: cold air blower and cold air knife, is connected with cold blower hose between said cold air blower and cold air knife; Between said cold wind device and said hot wind device A heat shield is provided to separate the cold air from the hot air.

Description

A drying system for flexible circuit boards

technical field

The present invention and a drying system for flexible circuit boards, in particular, relate to a drying system for flexible circuit boards that can dry without deviation, discount, or indentation.

Background technique

At present, the structural design of attached circuit components is developing towards miniaturization and thinning, and the application of thinner or small imposition flexible circuit boards is becoming more and more popular. The production process of thinner or small imposition flexible circuit boards uses traditional Under the pressure of the cold and hot air knives blowing out of the special roller-type horizontal conveying dryer, it is easy to cause its gold surface to be scratched, and the surface will be indented or discounted, which will reduce the yield rate.

Contents of the invention

In order to solve the above technical problems, the present invention provides a drying system for flexible circuit boards, including:

The two conveying devices are made of polytetrafluoroethylene materials, including: an upper conveyor belt and a lower conveyor belt that are close to each other and parallel, and the upper conveyor belt and the lower conveyor belt are ring-shaped fulfillment belts that rotate synchronously; two parallel upper conveyor belts There is a gap between the conveyor belt and the lower conveyor belt;

Four rotating shafts are respectively arranged at both ends of the conveyor belt, and are used to drive the transmission of the conveyor device;

The deviation mechanism is arranged on the rotating shaft, and adjusts the left end or the right end of the rotating shaft to adjust the tension of the upper conveyor belt and the lower conveyor belt;

The cold air device is used to blow out cold air; the cold air device includes: a cold air blower and a cold air knife, and the cold air blower and the cold air knife are connected by a cold air blower hose;

The hot air device is used to blow out hot air; the hot air device includes: a hot air blower and a hot air knife, and the hot air blower and the hot air knife are connected with a hot air hose; between the hot air hose and the hot air blower There are electric heaters for heating;

A heat shield for separating the cold air from the hot air is arranged between the cold air device and the hot air device;

The side of the hot air knife is provided with a wet air outlet for discharging air with moisture;

After the flexible circuit board enters the conveying device, it is blown dry in the cold air device, and then dried in the hot air device before being output.

Preferably, the rotating shaft is provided with a motor and a gear, the motor drives the gear, and the gear is used to drive the rotating shaft.

Compared with the prior art, the advantage is that in the present invention, a motor is used to drive a pair of gears, the gears drive the rotating shaft, and the rotating shaft drives the conveyor belt, which is beneficial to improve the connectivity of the transmission. The front end is used as the entrance to the flexible circuit board, the front part in the middle is the cold air knife drying section, the rear part in the middle is the hot air knife drying section, and the rear end is used as the outlet of the flexible circuit board, which is beneficial to accelerate the drying of the flexible circuit board. Because there is an appropriate gap between the two crawler conveyor belts, the flexible circuit boards with relatively thin thickness or small imposition can be dried without deviation, discount or indentation.

The upper and lower conveyor belts move forward or backward by adjusting the conveyor belt tension mechanism, adjusting the left end or the right end of the rotating shaft, so that the upper and lower conveyor belts maintain a certain tension and eliminate the deviation phenomenon. The lattice conveyor belt is made of polytetrafluoroethylene material, and the polytetrafluoroethylene conveyor belt is connected with the rotating shaft, because the product is conveyed horizontally through the board, and the polytetrafluoroethylene conveyor belt is driven by the upper and lower two ring-shaped fulfillment belts, which rotate synchronously. There is an appropriate gap between the upper and lower conveyor belts. In the prior art, there is a gap at the edge of the air knife in the drying system of the general transmission wheel, which is easy to jam the board, especially the thinner the board, the more difficult it is at the edge of the air knife. In the past, when the board is jammed, it will cause the polished gold surface, surface scratches, and discounts; while the transmission with the PTFE mesh conveyor belt has the air knife edge outside the conveyor belt, there is no gap, and the product will not be jammed. Furthermore, during the transportation process, the surface of the flexible circuit board with a relatively thin thickness or a small imposition can be protected, and quality problems such as grinding of the gold surface, surface scratches, discounts, and indentations are avoided, and the drying efficiency of the flexible circuit board is improved. efficiency and quality.

Moreover, the present invention adopts a cold air blower, is connected with a cold air knife through a hose, and blows cold air to drive away moisture on the front and back of the flexible circuit board, and then uses a hot air blower, connects an electric heater, connects a hose and a hot air knife, and blows out The hot air thoroughly dries the moisture on the surface and back of the flexible circuit board, preventing the oxidation of the flexible circuit board surface.

Preferably, a heat collecting air pan for collecting hot air back to the hot air blower is arranged above the hot air blower hose.

The present invention further adopts the above features, and its advantage is that the setting of the heat-collecting air tray connects the hose to the air inlet of the hot air blower, so that the hot air can be circulated and heated to achieve the purpose of energy saving.

Preferably, the side of the hot air knife is provided with a humid air outlet for discharging air with moisture. the

The present invention further adopts the above features, and its advantage is that the setting of the wet air outlet, the air with moisture is discharged from the wet air outlet so that the moisture air in the system can be discharged, and the drying inside the drying system is further ensured.

Preferably, the conveying device is selected to use at least one of square and rhombus grids with through holes.

Preferably, the edges of the cold air knives and the hot air knives in the upper conveyor belt are set downward; the edges of the cold air knives and hot air knives in the conveyor belt are set upward. Preferably, the cold air knife or the hot air knife is arranged between the upper and lower conveying surfaces of the upper conveying belt, and between the upper and lower conveying surfaces of the lower conveying belt.

The two upper and lower polytetrafluoroethylene grid conveyor belts adopted in the present invention are woven into square or rhombus grids with through holes. On the upper conveyor belt, the edge of the installed cold air knife is downward, and the edge of the installed hot air knife is downward, blowing cold and hot air to the front of the flexible circuit board through the through-hole grid on the conveyor belt; install on the next conveyor belt The air knife edge of the cold air knife is upward, and the air knife edge of the installed hot air knife is upward, blowing cold and hot air to the back of the flexible circuit board through the through-hole grid on the conveyor belt. However, because the connection is not the position of the air knife edge, the gap will not cause transmission problems such as jamming. In this way, the hot air and the cold air will not be blown together, which is more conducive to improving the efficiency of drying the circuit board.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the present invention.

Detailed ways

Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in further detail:

As shown in Figure 1, a drying system for flexible circuit boards, including:

Two conveying devices are made of polytetrafluoroethylene material, including: an upper conveyor belt 10 and a lower conveyor belt 11 that are close to each other and parallel;

Four rotating shafts 20 are respectively arranged at both ends of the conveyor belt for driving the transmission of the conveyor;

The deviation mechanism 30 is arranged on the rotating shaft 20 and is used to adjust the tension of the upper conveyor belt 10 and the lower conveyor belt 11;

The cold air device 40 is used to blow out cold air, including: a cold air blower 43 and a cold air knife 41, which are connected with a cold air blower hose 42 between the cold air blower 43 and the cold air knife 41;

Hot air device 50, is used for blowing hot blast, comprises: hot air blower 53 and hot air knife 51, links to each other with hot air hose 52 between described hot air blower 53 and hot air knife 51; Described hot air hose 52 and described hot air An electric heater 54 for heating is arranged between 53;

Between the cold wind device 40 and the hot wind device 50, a heat insulation board 60 for separating the cold wind from the hot wind is arranged;

After the flexible circuit board enters the conveying device, it is blown dry in the cold air device 40 , and then dried in the hot air device 50 before being output.

A heat collecting air pan 70 for collecting hot air is arranged above the hot air blower hose 52 .

The humid air outlet 80 provided on the side of the hot air knife 51 is used to discharge the air with moisture.

The rotating shaft 20 is provided with a motor 21 and a gear 22 , the motor 21 drives the gear 22 , and the gear 22 is used to drive the rotating shaft 20 .

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deduction or replacement can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims (6)

1. A drying system for flexible circuit boards, comprising: The two conveying devices are made of polytetrafluoroethylene materials, including: an upper conveyor belt and a lower conveyor belt that are close to each other and parallel, and the upper conveyor belt and the lower conveyor belt are ring-shaped fulfillment belts that rotate synchronously; two parallel upper conveyor belts There is a gap between the conveyor belt and the lower conveyor belt; Four rotating shafts are respectively arranged at both ends of the conveyor belt, and are used to drive the transmission of the conveyor device; The deviation mechanism is arranged on the rotating shaft, and adjusts the left end or the right end of the rotating shaft to adjust the tension of the upper conveyor belt and the lower conveyor belt; The cold air device is used to blow out cold air; the cold air device includes: a cold air blower and a cold air knife, and the cold air blower and the cold air knife are connected by a cold air blower hose; The hot air device is used to blow out hot air; the hot air device includes: a hot air blower and a hot air knife, and the hot air blower and the hot air knife are connected with a hot air hose; between the hot air hose and the hot air blower There are electric heaters for heating; A heat shield for separating the cold air from the hot air is arranged between the cold air device and the hot air device; The side of the hot air knife is provided with a wet air outlet for discharging air with moisture; After the flexible circuit board enters the conveying device, it is blown dry in the cold air device, and then dried in the hot air device before being output. 2 . A drying system for flexible printed circuit boards according to claim 1 , wherein a heat collecting air pan for collecting hot air is arranged above the hot air blower hose. 3 . 3. A drying system for flexible circuit boards according to claim 1 or 2, wherein the cold air knife or the hot air knife is arranged between the upper and lower conveying surfaces of the upper conveyor belt, And between the upper and lower conveying surfaces of the lower conveyor belt. 4. A drying system for flexible circuit boards as claimed in claim 1 or 2, characterized in that, the upper conveyor belt and the lower conveyor belt are selected from square and rhombus grids with through holes at least one. 5. A drying system for flexible circuit boards as claimed in claim 1, wherein the edges of the cold air knives and the hot air knives in the upper conveyor belt are set downward; The knife edges of the cold air knife and the hot air knife in the conveyor belt are set upward. 6. A drying system for flexible circuit boards as claimed in claim 1, wherein a motor and a gear are arranged on the shaft, the motor drives the gear, and the gear is used to drive the described shaft.

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