JP3201692B2 - drying furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drying oven for drying and baking a work such as an automobile body which has been coated.

[0002]

2. Description of the Related Art Drying furnaces for heating and drying and baking a work placed on a truck at a loading point before entering a furnace body while transporting the work inside the furnace body are widely used.

A typical conventional configuration of such a drying oven (here, a U-turn type drying oven) is shown in FIGS. FIG.
In the figure, reference numeral 10 denotes a tunnel type furnace body, in which a heating device is provided. As the heating device, a convection heating type hot air circulation device, a radiation heating device using a radiation heating plate, or the like is employed. Reference numeral 21 denotes a floor conveyor, which is configured to move and drive a cart 29 with wheels so as to be able to convey the inside of the furnace body 10. The carriage 29 has a structural strength capable of stably mounting the work W.
In FIG. 3, reference numeral 25 denotes a carry-in overhead conveyor, which is configured to be able to convey a coated work W placed on a hanger 26 to a drying oven.

The transfer of the workpiece W from the loading overhead conveyor 25 to the carriage 29 is performed at the entrance 10 i of the furnace body 10.
This is performed using the lifting lifter 31 at the immediately preceding arrival location P1. That is, by causing the lifting / lowering lifter 31 to appropriately perform the lifting / lowering operation as shown in FIG. 3 and causing the work transfer arm 32 to perform the projecting / retracting operation,
The work W placed on the hanger 26 of the loading overhead conveyor 25 can be placed on the carriage 29.

The work W placed on the carriage 29 and heated and dried while being conveyed in the furnace body 10 is lifted by the lifting lifter 3 at the unloading place P2 immediately after the outlet 10e of the furnace body 10.
1 to be transferred to the carry-out overhead conveyor 27.

[0006]

In the above-mentioned conventional drying furnace, it is often difficult to heat and dry the workpiece W with good thermal efficiency and to uniformly heat each part. That is, when the workpiece W enters the heating region in the furnace body 10, the temperature of the side portion quickly rises and reaches a predetermined baking temperature, but the temperature of the bottom portion having a large heat capacity rises slowly and is lower than the baking temperature. Temperature.

Therefore, since the length of the heating area and the moving speed of the workpiece W are constant, the side portion satisfies a predetermined baking time, but the bottom portion has an insufficient baking time.

Thus, conventionally, from the viewpoint of intensively and efficiently heating the bottom having a large heat capacity with respect to the side, various arrangements of the heating means are devised. However, these measures do not always provide a sufficient effect in spite of the large equipment cost and layout burden.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to quickly and uniformly raise the entire work to a predetermined temperature in a furnace.
An object of the present invention is to provide a drying furnace that can be maintained and dried efficiently with heat.

[0010]

SUMMARY OF THE INVENTION The present invention focuses on the fact that a work is carried on a trolley and the heat capacity of the trolley is enormous compared to that of the work (bottom) in order to ensure its mechanical rigidity. The above object is achieved by heating an empty trolley before entering the furnace body.

That is, in the drying furnace according to the present invention, in a drying furnace in which a work placed on a truck is transported through a furnace at a loading place before entering the furnace body and heated and dried, an empty space is provided near the loading place. An empty bogie preheating means for heating the bogie is provided.

[0012]

According to the present invention having the above-described structure, the bogie is heated by the empty bogie preheating means before the workpiece is placed just before the entrance of the furnace body. Therefore, in the furnace, heat transfer from the bottom of the work to the bogie is suppressed, and by appropriately controlling the temperature of the bogie, the work is actively heated from the time the work is placed, so that the predetermined temperature can be quickly reached. Start-up
Can be maintained.

[0013]

FIG. 1 is a plan view for explaining the overall configuration of the present drying furnace. Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, this drying oven has the same basic configuration (furnace body 10, floor conveyor 21, trolley 29, lifting lifter 31, etc.) as the conventional example (FIGS. 2 and 3), Is provided with an empty bogie preheating means 41 to heat the empty bogie 29 just before entering the furnace body 10, thereby suppressing the heat transfer from the bottom of the work W to the bogie 29 at the time of heating, and quickly and uniformly the entire work W. It is configured to be able to start up and maintain at a predetermined temperature. Note that the same components as those in the conventional example (FIGS. 2 and 3) are denoted by the same reference numerals, and description thereof will be omitted or simplified.

First, a hot air circulation device 11 as a heating means is provided in a heating area of the furnace body 10. The hot air circulation device 11 includes a burner 12 and a circulation fan 13, and is configured to be able to circulate and supply hot air into the furnace body 10. The furnace body 10 is provided with a heating type deodorizing device 14.

The deodorizing device 14 is of a catalytic combustion type, and is connected to the furnace body 10 via an exhaust duct 15. The deodorizing device 14 includes a catalyst 19 for burning and decomposing harmful odorous substances in exhaust gas and a catalyst 19 at a predetermined processing temperature (for example, 3 ° C.).
Catalyst heating burner 18 to be heated to a temperature in the range of 100 to 350 ° C.)
, A blower 16, and an exhaust fan 17,
The exhaust gas from 0 is configured to be deodorized and released to the atmosphere.

The empty bogie preheating means 41, which is a technical feature of the present invention, heats the empty bogie 29 before the workpiece W is loaded in the vicinity of the loading place P1 before entering the entrance 10i of the furnace body 10. It is a means to do. As described above, the empty bogie preheating means 41 is provided in the vicinity of the loading location P1.
This is because the temperature of the empty cart 29 preheated in step 1 when it reaches the arrival location P1 is reduced as much as possible and falls within the allowable temperature drop range. In the case of the present embodiment, the empty bogie preheating means 41 is provided in an upstream portion in the work transport direction immediately near the arrival location P1. And the empty truck preheating means 41
Is configured to heat the carriage 29 by using a part of the exhaust gas of the deodorizing device 14, and the heating chamber 42, the collection duct 4
3. It is composed of an exhaust duct 44 and an exhaust fan 45.

The heating chamber 42 is provided in the vicinity of the upstream of the loading location P1 on the transport path of the carriage 29. Further, the heating chamber 42 is formed in the shape of a rectangular tube as a whole,
9 is formed so as to be able to enter and exit. Further, the heating chamber 42
Is formed so as to cover the entire carriage 29.
A collection duct 43 for collecting high-temperature exhaust gas from the deodorizing device 14 is attached to the heating chamber 42, and high-temperature exhaust gas is supplied through the duct 43. Further, an exhaust duct 44 and an exhaust fan 45 are connected to the heating chamber 42.

Next, the operation of this embodiment will be described. The carriage 29 enters the heating chamber 42 before the work W is placed before the entrance 10 i of the furnace body 10, and is heated by using a part of the exhaust gas of the deodorizer 14. Therefore, when the empty carriage 29 heated in the heating chamber 42 is conveyed by the floor conveyor 21 and positioned at the loading location P1, and then the workpiece W coated by the lifting lifter 31 is placed on the carriage 29. , The bottom of the work W is the furnace 1
It is heated positively by the carriage 29 before entering the inside.

Therefore, when the work W placed on the preheated trolley 29 is conveyed in the furnace body 10, heat transfer from the bottom of the work W to the trolley 29 is suppressed. It is possible to quickly start up and maintain a predetermined temperature.

Thus, according to this embodiment, the empty truck preheating means 41 for heating the empty truck 29 before the work W is loaded is provided in the vicinity of the loading location P1, so that the configuration is provided.
Since the bottom of the work W having a relatively large heat capacity can also be raised and maintained at a predetermined temperature at the same time as the side, the entire work W can be dried quickly and uniformly with good thermal efficiency.

The empty bogie preheating means 41 is provided with the deodorizing device 1.
Since the carriage 29 is heated by using the high-temperature exhaust gas from No. 4, the heat efficiency is high and it is economical.

The empty truck preheating means 41 is connected to the loading location P1.
, The work W can be placed and put into the furnace body 10 without lowering the temperature of the carriage 29, and the work W (bottom portion) can be heated more efficiently.

In the above embodiment, the empty truck preheating means 4
1 is configured to heat the carriage 29 using high-temperature exhaust gas from the deodorizing device 14 near the loading location P1, but it may be configured to provide a dedicated heating device to heat the carriage 29. Further, the carriage 29 may be heated using heat from another high-temperature source.

[0024]

According to the present invention, an empty bogie preheating means for heating an empty bogie is provided in the vicinity of the loading place, so that heat transfer from the bottom of the work to the bogie in the furnace body can be suppressed. The bottom of the work can be positively heated by the heat of the carriage by adjusting the temperature of the carriage appropriately. Therefore, the entire work can be quickly and uniformly raised and maintained at a predetermined temperature in the furnace body and dried with high thermal efficiency.

[Brief description of the drawings]

FIG. 1 is a plan view for explaining an embodiment of the present invention.

FIG. 2 is a diagram for explaining a conventional configuration of a drying furnace.

FIG. 3 is a view for explaining a work loading operation of a lifting lifter.

[Explanation of symbols]

 Reference Signs List 10 furnace body 14 deodorizing device 29 truck 41 empty truck preheating means 42 heating room 43 collection duct 44 exhaust duct 45 exhaust fan P1 arrival place

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 3-83673 (JP, U) JP-A 3-83671 (JP, U) JP 5-3264 (JP, Y2) (58) Survey Field (Int.Cl. ⁷ , DB name) B05C 9/10-9/14 B05D 3/02 F26B 1/00 F26B 15/16

Claims (1)

(57) [Claims] 1. A drying furnace for heating and drying a work placed on a trolley at a loading place before entering a furnace body by heating the work inside the furnace and heating an empty trolley near the loading place. A drying oven, characterized by comprising: