JPS646948Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a coating drying furnace, and in particular, a furnace body that is open at both ends and formed in a tunnel shape, such as a flat furnace or a mountain furnace. The present invention relates to an improvement in a coating drying oven for baking and drying a coating film by continuously passing a coated object through the coating.

[Prior art and its problems]

Tunnel-shaped coating drying ovens with open ends of the oven body are suitable for continuous mass production using conveyors, and are therefore used as baking drying ovens for, for example, automobile painting.

In this baking drying oven, coatings formed with thermosetting amino alkyd resin paints, acrylic resin paints, thermosetting epoxy resin paints, phthalic acid resin paints, polyurethane resin paints, etc.
For example, a strong coating film is formed by heating and drying at a high temperature of about 120 to 200°C to polymerize and harden the resin that is the coating film component.

By the way, when the coating film is heated at high temperatures in this manner, organic solvents such as thinner and toluene, and amine compounds such as hardeners for epoxy resins contained in the coating material evaporate and harmful gases are generated. Especially,
Cationic and anionic paints used as electrodeposition paints emit smoky noxious gas containing foul-smelling fat.

Therefore, in the past, the entrance and exit of the furnace body was designed to prevent such harmful gases from flowing out of the furnace together with the heated air inside the furnace, and to prevent hot air from dissipating from the furnace and dust from entering the furnace. Air curtains, etc. are installed.

However, when the object to be coated has a hollow part, such as an automobile body, the harmful gases generated in the furnace are contained in the inner space of the object and are placed in an air curtain along with the object. The disadvantage was that it passed through the furnace and was taken out of the furnace.

[Purpose of invention]

Therefore, an object of the present invention is to prevent harmful gases generated in the furnace from being carried out of the furnace together with the object while being contained in the internal space of the object to be coated.

[Structure of the invention] In order to achieve this object, the present invention provides a coating drying furnace for heating and drying a workpiece by continuously passing it through a tunnel-shaped furnace body with openings at both ends open. an air jetting section that emits air to wipe away harmful gases that have entered the internal space of the object to be coated immediately before being carried out from the furnace body, is at a height facing the internal space from the side; It is characterized by being installed inside a heat seal part provided at the outlet of the furnace body.

[Effect of invention]

According to the present invention, the harmful gases in the furnace that are contained and stagnant in the internal space of the object to be coated passing through the furnace are released from the air jet section immediately before the object to be coated is taken out of the furnace. The emitted air sweeps and eliminates the harmful gases, and therefore the amount of harmful gases generated within the furnace body that are carried out of the furnace together with the work to be coated that is carried out from the furnace body is greatly reduced.

〔Example〕

Hereinafter, the present invention will be explained based on specific embodiments shown in the drawings.

FIG. 1 is a front view showing an example of a coating drying furnace according to the present invention, and FIG. 2 is a side view as seen from the outlet side.

In the figure, 1 is a furnace body formed of a heat insulating wall, and 2 is a conveyor that continuously transports objects 3 to be coated, such as automobile bodies, suspended from hangers 4 in the direction of arrow F.

The furnace body 1 is formed in the shape of a tunnel with both ends open, and air curtains (not shown) are provided at both ends to prevent air from flowing out of the furnace and are heat-sealed.

Then, on the outlet 5 side in the furnace body 1, the outlet 5 is
An air jetting section 7 is installed inside the air curtain provided in the coating material 3 to emit air toward the internal space 6 of the object 3 to be coated.

This air blowing section 7 supplies air from an air supply fan 9 to a box-shaped air supply chamber 8 fixedly installed on one side wall of the furnace body 1, and is arranged in a vertically extending manner at predetermined intervals in front of the air supply chamber 8. A plurality of air ejection holes 10, 10 formed in
Air is ejected at a required speed and volume from ..., and each air ejection hole 10 is selected to have a required length depending on the height of the space 6 of the object 3 to be coated.

As shown in FIG. 2, an air suction port 12 connected to the exhaust duct 11 is provided on the side wall of the furnace body 1 facing the air jet section 7, and the air discharged from the furnace body 1 is passed through a filter ( (not shown), etc., and is circulated and supplied to the air supply fan 9.

The above is an example of the construction of a coating drying oven according to the present invention, and its operation will be explained next.

When the coating film formed on the surface of the workpiece 3, which is suspended from the hanger 4 of the conveyor 2 and passed continuously through the furnace body 1, is baked, harmful gases such as solvent gas are generated and Fills the body 1.

In the drying oven, the air contaminated by the generation of harmful gases is exhausted outside the oven body 1 and sent to the deodorizing and purifying equipment. In the formed object 3, harmful gases enter the space 6 and remain there.

Then, this workpiece 3 completes baking and the furnace body 1
When the air is transferred to the outlet 5 side of the air outlet 5 and passes in front of the air outlet 7, each air outlet 10 of the air outlet 7,
The harmful gases staying in the space 6 are wiped out by the air released from the air 10 and removed outside the space 6, and the object 3 to be coated is carried out of the furnace body 1 without taking out the harmful gases.

As described above, according to the embodiment, the harmful gases staying in the space 6 of the object to be coated 3 are released from each air jet hole 10 of the air jet section 7 disposed on the outlet 5 side of the furnace body 1. The object 3 to be coated is carried out from the outlet 5 in the excluded state.

Therefore, the disadvantage that the harmful gases generated in the furnace body 1 are carried out of the furnace together with the article 3 to be coated which is carried out of the furnace body 1, as in the conventional case, is prevented.

Although the air jetting section 7 in the embodiment has been described with respect to the case where the air jetting hole 10 is vertically formed in the front of the box-shaped air supply chamber 8, the air jetting section according to the present invention is not limited to this, for example. When the object 3 to be coated is a high-roof type wagon or the like, a plurality of air discharge pipes may be arranged at a desired angle toward the interior space of the object.

Further, the air suction port 12 may be formed in the upper wall of the furnace body 1.

[Effect of idea]

As described above, according to the present invention, harmful gases generated in the furnace body due to baking drying of the coating film and staying in the internal space of the object to be coated that are continuously passed through the furnace body are removed from the furnace body. Since the air is removed by the air released from the air outlet provided on the outlet side, it has the excellent effect that harmful gases inside the furnace are not carried out of the furnace together with the object to be coated, unlike in conventional methods. .

[Brief explanation of drawings]

FIG. 1 is a front view showing an example of a coating drying furnace according to the present invention, and FIG. 2 is a side view as seen from the outlet side. Explanation of symbols: 1...furnace body, 2...conveyor, 3...object to be coated, 5...outlet of furnace body, 6...internal space, 7...air jet section, 9...air supply fan, 10...air jet hole.

Claims (1)

[Scope of utility model registration request] Tunnel-shaped furnace body 1 with open entrances and exits at both ends
In a coating drying oven that heats and dries the object 3 by continuously passing it through the furnace body 1, harmful gases that have entered the inner space 6 of the object 3 just before being carried out from the furnace body 1 are wiped away. The air jet section 7 that releases the air that causes the furnace body 1 to emit air is installed inside a heat seal section provided at the outlet 5 of the furnace body 1 at a height facing the internal space 6 from the side thereof. A paint drying oven featuring: