JPH02115069A - Coating dryer - Google Patents

Abstract

PURPOSE:To inhibit vibration of a metallic thin plate and to prevent carrier trouble by allowing the suction ports to approach to the blow-off port sides nearer than to the central part between the respective blow-off ports and arranging the suction ports adjacently to the blow-off ports. CONSTITUTION:The wavy deformation of a metallic thin plate A is caused by both hot air blowing force from the blow-off ports 2 and hot air sucking force from the suction ports 3 which are allowed to act at couple of forces. Further vibration of the metallic thin plate A results from this wavy deformation and is caused according to carrier thereof. These wavy deformation and vibration of the metallic thin plate are inhibited by the adjacent arrangement and structure of the blow-off ports 2 and the suction ports 3. Thereby the metallic thin plate A can be carried more stably and smoothly in a levitating state in a furnace. Hot air is sucked and exhausted into/from the upper air feed chamber 7 and the lower air feed chamber 8 respectively via the air feed ducts 12, 13 with the feed fans 10, 11 fitted thereto. The sucked and exhausted hot air is returned to an hot air generator. Thereby the levitating state of the metallic thin plate A can be more stabilized.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a coating drying device that transports thin plates used for various purposes in a floating state after coating and performs coating drying. Air outlets for keeping a thin plate to be painted and dried in a floating state by blowing gas against its lower surface are distributed in the transport path of the thin plate, and suction ports are provided for sucking and exhausting gas downward from below the thin plate in a floating state. The present invention relates to a paint drying device disposed between the air outlets.

[Conventional technology]

Conventionally, in the above-mentioned paint drying equipment, as shown in FIGS. 8 and 9, suction is drawn into a central location between the air outlets (2) distributed in the conveyance path (1) of the thin plate (A). The mouth (3) was placed (for example, Special Publication No. 60-42139
(see publication).

[Problem to be solved by the invention]

However, originally, the suction port (3) stabilizes the floating state of the thin plate (A) by quickly discharging the gas blown onto the lower surface of the thin plate (A) from below the floating thin plate (A). However, in the conventional paint drying equipment described above, gas is blown from the air outlet (2) and air is blown from the air inlet (3).
Due to the gas absorption, the thin plate (A) in a floating state is deformed into a wavy shape as shown by the broken line in FIG. 8, and undulates as the product is transported, which causes problems in transportation.

Additionally, in this type of paint drying equipment, as shown in Figure 8, an upper air outlet (4) is often provided to spray presser gas onto the upper surface of the thin plate (A) in a floating state. However, in this case, the wave-like deformation was increased due to the gas suction from the suction port (3) and the gas blowing from the upper blow-off port (4), and the above-mentioned wave motion was generated even more significantly.

An object of the present invention is to effectively suppress the above-mentioned waves by rationally improving the arrangement relationship between the air outlet and the air inlet.

[Means to solve the problem]

The characteristic configuration of the paint drying apparatus according to the present invention is that air outlets are distributed in the conveyance path of the thin plate to keep the thin plate to be coated and dried in a floating state by blowing gas against the lower surface of the thin plate during the conveyance process, and In a configuration in which an inlet for sucking and exhausting gas downward from below the thin plate is arranged between the outlets, the inlet is moved closer to the outlet than the center between the outlets. This is because the air outlet is arranged adjacent to the outlet, and the adjoining pairs of the blower outlet and the suction port are distributed in the transport path of the thin plate, and the functions and effects thereof are as follows.

[For production]

In other words, according to the above configuration, the bending moment generated in each part of the thin plate due to the gas blowing force from the air outlet and the gas suction force from the air inlet, which act as a couple, is due to the proximity of the air outlet and air inlet. This reduces the bending moment and increases the stiffness of the thin plate, effectively suppressing the wavy deformation of the thin plate and the wave motion caused by the conveyance caused by the wavy deformation. be done.

〔Effect of the invention〕

As a result, the conveyance of the thin plate has become smooth and stable, and the reliability, practicality, and processing efficiency of this type of coating drying apparatus have been greatly improved.

〔Example〕

Next, an example will be described.

In Figures 1 to 3, (1) is a tunnel-shaped in-furnace conveyance path that continuously conveys coated metal sheets (A) in the longitudinal direction of the furnace at predetermined intervals; At the bottom, there is an air outlet (2) that keeps the thin metal plate (A) in a floating state by blowing hot air against the lower surface of the thin metal plate (A) during the conveyance process, and a blower outlet (2) that directs the hot air inside the furnace downward from below the thin metal plate (A) in the floating state. Suction ports (3) for stabilizing the floating state of the thin metal plate (A) by suction and exhaust are arranged in parallel in the conveying direction.

Also, on the ceiling of the conveyance path (1), there is an upper air outlet (4) which blows hot air onto the upper surface of the thin metal plate (A) and presses down the thin metal plate (A) in a floating state. F
) are arranged in parallel.

Note that the thin metal plate (A) has upper and lower air outlets (2) and (4).
Painting is dried by blowing hot air from

(5) is a locking tool that is brought into contact with the rear edge of the thin metal plate (A), and (6) is a locking tool that moves the locking tool (5) at a predetermined speed toward the lower side in the conveying direction (F). This is a conveyor device, and the metal sheet (A) in a floating state is pushed and conveyed by this locking tool (5).

The upper and lower air outlets (2), (4), and the suction port (3) are formed in the shape of a slit that almost spans the contour feeding path (1), and the upper and lower air outlets (2), (4) They are arranged in the transport direction (F) at predetermined intervals (dl) and (d2), respectively.

Also, the slit-shaped suction port (3) is connected to the lower air outlet (2).
It is arranged adjacent to both sides of the air outlet (2) closer to the air outlet (2) than the center point between them, and as a whole, it consists of a slit-shaped air outlet (2) and a slit-shaped suction located on both sides of the air outlet (2). It has a structure in which adjacent pairs with the opening (3) are arranged in the conveying direction (F) with a predetermined distance @ (dl).

In other words, the wavy deformation of the thin metal plate (A) caused by the hot air blowing force from the outlet (2) and the hot air suction force from the suction port (3) acting in a couple (deformation as shown by the broken line in FIG. 8) )
, and the wave motion of the thin metal plate (A) that occurs along the cableway due to its wavy deformation is suppressed by the above-mentioned structure in which the air outlet (2) and the suction port (3) are arranged adjacent to each other. The thin plate (A) can be more stably and smoothly transported inside the furnace in a floating state.

(7) is an upper air supply chamber that supplies hot air to the upper outlet (4), (8) is a lower air supply chamber that supplies hot air to the lower outlet (2), and (9) is an inlet (3). The upper air supply chamber (7) and the lower air supply chamber (8) each have an air supply duct (10) and (11) interposed therein. 12) and (13), hot air is supplied under pressure from a hot air generator (not shown), and an exhaust duct (15) with an exhaust fan (14) is connected from the exhaust chamber (9). Hot air is sucked and exhausted through the hot air generator, and the hot air is returned to the hot air generator.

Regarding the formation structure of the lower slit-shaped outlet (2) and the slit-shaped suction ports (3) adjacent to both sides thereof, the slit-shaped hot air outlet nozzle (1) is connected from the lower air supply chamber (8) to the slit-shaped hot air outlet (1).
6) upright and its hot air blowing nozzle (16)
The upper end of the outlet is a slit-shaped outlet (2), and the conveyor path bottom plate (17) is provided between the slit-shaped outlets (2), and the vertical plate (1) forming the hot air outlet nozzle (16).
6a), as well as the top plate of the lower air supply chamber (8) (
The restricted space surrounded by the exhaust chamber (9)
A slit-shaped suction port (3) is formed in the gap formed between each end edge of the conveyance path bottom plate (17) and the hot air blowing nozzle forming vertical plate (16a).

In other words, the slit-like outlet (2) and the slit-like suction port (
3) is an adjacent structure partitioned by a vertical plate (16a) for forming a hot air blowing nozzle as a partition wall.

(18) is a punching plate for equalizing the amount of hot air supplied to each outlet (2).

In addition, in the suction port forming structure as described above, by appropriately adjusting the ratio of the amount of hot air blown out from the outlet (2) and the amount of hot air suctioned from the suction port (3), the thin metal plate (
A thin metal plate (
A) A moderate positive pressure area is created when a portion of the hot air blown onto the lower surface enters.
This further stabilizes the floating state of the thin metal plate (A).

[Another example]

Next, another example will be listed.

(B) Various improvements can be made to the distributed arrangement of the adjacent pairs of the air outlet (2) and the suction port (3), and even if they are arranged in a distributed manner as shown in FIGS. 4 to 6, respectively. good.

(b) The specific shapes and formation structures of the air outlet (2) and suction port (3) can be improved in various ways, for example,
It may also be formed into a curved or circular shape.

(c) The means for conveying the thin plate (A) in a floating state can be modified in various ways; for example, as shown in FIG. A catch (1) that moves at a predetermined speed toward the lower side of the conveyance path (1)
9), the thin plate (A) in a floating state may be conveyed and moved downward in the conveying direction by falling under its own weight while the leading edge of the thin plate (A) is received.

(d) Various gases can be used as the gas blown from the outlet (2) onto the lower surface of the thin plate (A), and the coating drying process of the thin plate (A) itself may be performed using radiant heating.

(e) The material of the thin plate (A) is not limited to metal, and may be, for example, a plastic sheet or a craft sheet.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 is a plan view, and FIG. 3 is an enlarged sectional view. 4 to 6 are plan views showing other embodiments of the present invention, and FIG. 7 is a longitudinal sectional view showing another embodiment of the present invention. FIGS. 8 and 9 are a longitudinal sectional view and a plan view showing a conventional structure. (1)... Conveyance route, (2)... Air outlet, (3)... Suction port, (16a)...
・Plate partition wall, (A)... Thin plate, (F)...
...Conveyance direction.

Claims (1)

[Claims] 1. An air outlet (2) that keeps the thin plate (A) to be coated and dried during the conveyance process in a floating state by blowing gas against its lower surface.
) are distributed in the conveyance path (1) of the thin plate (A), and a suction port (3) for sucking and exhausting gas downward from below the thin plate (A) in a floating state is connected to the blowout port (2). a paint drying device disposed between the suction port (3);
is arranged adjacent to the air outlet (2) so as to be closer to the air outlet (2) than the central location between the air outlet (2), and the air outlet (2) and the suction port (3) A paint drying apparatus in which adjacent pairs of . 2. Each of the air outlet (2) and the suction port (3) is formed in a slit shape, and the slit-shaped air outlet (2) is spaced at a predetermined interval (d_1) in the conveying direction (F) of the thin plate (A). The air outlet (2) and the suction port (3) are arranged side by side, and the slit-shaped air outlet (3) is arranged adjacently on both sides of the slit-shaped air outlet (2). Claim 1
Paint drying equipment as described. 3. In a pair of adjacently arranged air outlet (2) and said suction opening (3), said air outlet (2) and said suction opening (3) are partitioned by a plate-shaped partition (16a). or 2
Paint drying equipment as described. 4. The apparatus according to claim 1, 2, or 3, wherein a pair of adjacently arranged pairs of the blower outlet (2) and the suction port (3) are arranged symmetrically with respect to a center line of the conveyance path (1). Paint drying equipment.