JPH05248763A - Drying device - Google Patents

Abstract

PURPOSE:To shorten a drying time by a method wherein the surface temperature difference of a substance to be processed owing to unevenness in temperature in a tank is prevented from production, in the drying tank of a carrier jig conveyance system electrodepositing device. CONSTITUTION:Hot blast discharge ports 9a and 9b each having an opening pointing to the central part of the bottom of a drying tank 2 are formed in the front and the rear of the inner upper part of the drying tank 2 and suction ports 11a and 11b between which a W-shaped guide plate 10 is located are formed in a bottom symmetrically about the central line of the drying tank 2. This constitution causes circulation of hot blast through the tank without stagnation, uniformizes temperature in the tank, and dries a substance to be processed uniformly in a short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drying device, and more particularly to a drying tank in a carrier jig transfer system electrodeposition device for a printed wiring board (hereinafter referred to as PWB).

[0002]

2. Description of the Related Art As shown in a side sectional view of FIG. 3 and a front sectional view of FIG. 4, a drying tank in a conventional carrier jig transfer system electrodeposition apparatus is either one of the left and right inner side surfaces above the drying tank 2. Hot air outlet 9 on one side and suction port 11 on the bottom of the tank
have.

In the drying tank 2, the air sent from a blower (not shown) enters the heating chamber 6 from the duct 14 and is heated by the heater 3 in the heating chamber 6 to become hot air, which is blown into the tank from the hot air outlet 9. To be done. The hot air blown into the tank circulates in the tank, is sucked through the suction port 11 and returns to the blower through the duct 13.

[0004]

In the conventional drying tank 2, the hot air does not circulate uniformly in the tank, and the air flow stagnates especially on the opposite side of the hot air outlet 9 or under the hot air outlet 9 at the top of the tank. However, the temperature of that portion does not rise and a large temperature variation (10 ° C. in the range) occurs in the tank.

Therefore, the PWB put in the drying tank 2
A portion where the air having a high temperature hits the portion 12 and a portion where the air having a low temperature hits the portion 12 are generated, and a difference in the drying speed occurs on the surface of the PWB 12, and an undried portion is generated. In addition, a long drying time is required to prevent this.

[0006]

In the drying apparatus of the present invention, hot air outlets having openings facing the center of the bottom of the drying tank are arranged in front of and behind the upper part of the drying tank, and the hot air blowing port is provided at the bottom of the tank. A suction port having a W-shaped guide plate for circulating hot air with the center of symmetry as the axis of symmetry is provided.

[0007]

The present invention will be described below with reference to the drawings. 1 is a side sectional view of an embodiment of the present invention, and FIG. 2 is a front sectional view of the present invention.

First, the structure of this embodiment will be described.
Below the drying tank 2 in which the carrier jig 1 is conveyed in the direction of the arrow C, there is a heating chamber 6 in which a heater 3 and a damper 4a are provided and a duct 5a is provided on the lower surface, and the drying tank following the heating chamber 6 is provided. Hot air passages 8a and 8b, in which temperature sensors 7a and 7b are provided, are provided along the front and rear inner side surfaces of 2. The hot air passages 8a and 8b are provided with hot air outlets 9a and 9b facing each other in front of and behind the upper portion of the drying tank 2 toward the center of the bottom of the tank. Further, at the bottom of the drying tank 2, there is a suction port 11 having a W-shaped guide plate 10 having the center of the tank as an axis of symmetry.
a and 11b are provided. Further, ducts 5b and 5c connected to the suction ports 11a and 11b are provided at the lower portions of the left and right side surfaces of the drying tank 2. Duct 5b, 5c
The dampers 4b and 4c are internally provided in the.

Next, the flow of hot air in the drying tank 2 will be described. The air sent by the blower (not shown) enters the heating chamber 6 through the duct 5a and is heated by the heater 3 to become hot air. The temperature of the hot air is detected by the temperature sensor 7 and is controlled by turning on / off the heater 3. The hot air passes through the hot air passages 8a and 8b and is blown from the hot air passage outlets 9a and 9b onto the surface of the PWB 12 held by the carrier jig 1. The hot air reaching the bottom of the drying tank 2 is W
Ascends along the character-shaped guide plate 10, circulates in the tank as indicated by arrows A and B, is sucked through the suction ports 11a and 11b, and returns to the blower through the ducts 5b and 5c. The hot air blown out from the hot air outlets 9a and 9b is balanced by the damper 4a, and the hot air sucked in through the air inlets 11a and 11b is balanced by the dampers 4b and 4c. In this way, the hot air circulates uniformly throughout the drying tank 2, and the temperature inside the tank becomes uniform.

[0010]

As described above, according to the present invention, since hot air circulates uniformly in the entire drying tank, the temperature in the tank becomes uniform and the drying speed of the object to be processed varies within a range of 5 ° C or less. In addition, the drying time can be shortened by about 10% as compared with the conventional case.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of the present invention.

FIG. 2 is a front sectional view of an embodiment of the present invention.

FIG. 3 is a side sectional view of a conventional drying device.

FIG. 4 is a front sectional view of a conventional drying device.

[Explanation of symbols]

 1 Carrier jig 2 Drying tank 3 Heater 4a, 4b, 4c Damper 5a, 5b, 5c Duct 6 Heating chamber 7a, 7b Temperature sensor 8a, 8b Hot air passage 9a, 9b Hot air outlet 10 W-shaped guide plate 11a, 11b Suction Mouth 12 PWB 13 Duct 14 Duct

Claims (1)

[Claims] 1. A hot-air outlet having an opening toward the center of the bottom of the tank is disposed in front of and behind the upper part of the drying tank, and W for circulating hot air with the center of the tank as the axis of symmetry is arranged at the bottom of the tank. A drying device having a suction port having a character-shaped guide plate.