JP2012030181A - Mound-shaped drying furnace used for coating elevator design goods - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new drying furnace in which hot air staying in a horizontal part never leaks to the outside from a gateway of the drying furnace through a ramp even when the horizontal part of the drying furnace cannot be provided higher enough than the ramp.SOLUTION: The mound-shaped drying furnace 100 used for coating elevator design goods includes: the ramp 11 extending upward from the gateway 10; the horizontal part 12 connected with an upper end part of the ramp 11 and extending horizontally; a hot air supply means for supplying the hot air A in the horizontal part 12; and a hot air leakage preventing means 13 for preventing the hot air A staying in the horizontal part 12 from leaking to the outside from the gateway 10 through the ramp 11, provided for the connection between the ramp 11 and the horizontal part 12.

Description

  Embodiments of the present invention relate to a mountain drying furnace used for painting an elevator design product.

Conventionally, elevator car doors and side panels, landing hall doors, three-way frames, etc. (hereinafter referred to as “design products”) have been painted in various colors to meet customer needs.
At this time, in the coating line for coating these design products, as shown in FIG. 9, the design product 1 conveyed from the press processing line (not shown) in the previous process is extended endlessly. It is suspended from the first part 2a of the conveyor chain 2 circulating in the painting line.
Then, the suspended design article 1 is subjected to pretreatment such as shower washing, pickling and zinc phosphate coating treatment in the pretreatment booth 3 in accordance with the movement of the conveyor chain 2 in the arrow direction, and then dried. While making a U-turn in the first part 4A of the furnace 4 and being heated, it is dried and the rust prevention ability is improved, and the adhesion of the paint sprayed in the next coating process is improved.
Next, the design product 1 coming out of the drying furnace 4 is heated and dried while making a U-turn in the second part 4B of the drying furnace 4 after being undercoated and overcoated in the coating booths 5A and 5B. A hard coating is formed.
Then, the finished design product 1 is removed at the final portion 2b of the conveyor chain 2, packed, and shipped to the construction site where the elevator is installed.

The drying furnace 4 that heats and dries a design product in the above-described coating line includes an inclined portion 4a having an entrance and a horizontal portion 4b on which a drying process is performed, as schematically illustrated in FIG. Since the horizontal portion 4b is provided above the entrance / exit, it is generally called a mountain drying furnace.
Further, the hot air A generated in the combustion device 6 is supplied to the horizontal portion 4b through the pipe 7a, and the design product 1 moving inside the horizontal portion 4b is held in a high temperature atmosphere and heated and dried. .
And most of the hot air A used for heating and drying the design product 1 returns to the combustion device 6 through the pipe 7b, but a part of the hot air A is taken out through the pipe 7c to remove the components volatilized from the paint. It is sent to the process of removing.

At this time, the floor surface 4c of the horizontal portion 4b of the drying furnace 4 is provided above the entrance / exit upper end portion 4d provided in the inclined portion 4a by a sufficiently large vertical dimension H1.
Thereby, the hot air A staying inside the horizontal portion 4b does not leak out of the furnace from the entrance through the inclined portion 4a.

JP 2008-49281 A

By the way, as shown in FIG. 11, when the ceiling beam 9 is provided in the building where the painting line is provided, the value of the ceiling height H2 of the horizontal portion 4b of the drying furnace 4 cannot be increased.
Then, the floor surface 4c of the horizontal portion 4b of the drying furnace 4 is positioned below the upper end portion 4d of the entrance / exit of the inclined portion 4a by the vertical dimension H3.

  In particular, since there are many panels having a small size in the width direction but a large size in the vertical direction in the design of the elevator, the vertical position of the floor surface 4c of the horizontal portion 4b has to be lowered, and the vertical dimension H3. Tend to be larger.

As a result, as indicated by the arrows in FIG. 11, a part of the hot air A staying inside the horizontal portion 4b leaks out of the furnace from the entrance and exits from the furnace, so that the heat energy is lost. This increases the amount of fuel used and increases the running cost.
Therefore, an air curtain is provided at the entrance / exit of the drying furnace 4 so that the hot air A does not go out of the furnace, but it is difficult to completely prevent the hot air A from leaking out of the furnace.

  Therefore, even if the object of the embodiment of the present invention is that the horizontal part of the drying furnace cannot be provided sufficiently above the inclined part, the hot air staying in the horizontal part is inclined part. It is an object of the present invention to provide a novel drying furnace that does not leak from the entrance and exit of the drying furnace.

Embodiments of the present invention
A mountain-type drying furnace used for painting elevator design products,
An inclined portion extending obliquely upward from the doorway;
A horizontal portion connected to the upper end portion of the inclined portion and extending horizontally;
Hot air supply means for supplying hot air into the horizontal portion;
Hot air leakage prevention means provided at a connecting portion between the inclined portion and the horizontal portion, which prevents hot air staying in the horizontal portion from leaking out of the furnace through the inclined portion through the inclined portion. And.

The top view (a) and sectional elevation (b) which show the structure of a 1st embodiment of the present invention typically. Sectional elevation which shows typically the structure of 2nd Embodiment of this invention. Sectional elevation which shows typically the structure of 3rd Embodiment of this invention. Sectional elevation which shows typically the structure of 3rd Embodiment of this invention. Sectional elevation which shows typically the structure of 4th Embodiment of this invention. The top view which shows typically the action | operation of 4th Embodiment shown in FIG. The top view which shows typically the action | operation of 5th Embodiment of this invention. The top view (a) and sectional elevation (b) which show typically operation of the 6th embodiment of the present invention. The perspective view which shows the whole structure of the coating line of an elevator design product. Sectional elevation showing the structure of a complete chevron drying oven. Sectional elevation which shows the structure of an incomplete mountain-shaped drying furnace.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.
In the following description, the direction in which the elevator design product is suspended and moved by the conveyor chain is referred to as the front-rear direction, the vertical direction is referred to as the up-down direction, and the same parts are denoted by the same reference numerals. Is omitted.

First Embodiment First, a mountain-type drying furnace according to a first embodiment will be described with reference to FIG.

The mountain-shaped drying furnace 100 of the first embodiment shown in FIG. 1 cures the paint sprayed on the design articles 1 such as elevator car doors and side plates, landing hall doors, and three-way frames in a high-temperature atmosphere. An inclined portion 11 extending obliquely upward from the entrance 10, a horizontal portion 12 connected to the upper end of the inclined portion 11 and extending horizontally, and a combustion apparatus for supplying hot air to the inside of the horizontal portion 12 6 (see FIG. 10).
And between the inclination part 11 and the horizontal part 12, the hot air leakage prevention part 13 which prevents the hot air which remains in the inside of the horizontal part 2 from leaking out of the furnace through the inclination part 11 from the entrance / exit 10 is shown. Is provided.

The hot air leakage prevention portion 13 is provided above the mountain drying furnace 100 and protrudes upward through a gap between ladder-like ceiling beams 9 extending horizontally, and the ceiling 11 a of the inclined portion 11 and the ceiling of the horizontal portion 12. It has a protruding ceiling portion 13a connected to the portion 12a.
Specifically, the protruding ceiling portion 13a extends upward through a gap surrounded by a pair of left and right vertical beams 9a and 9a and a pair of front and rear horizontal beams 9b and 9b.

Further, the floor surface 11b of the inclined portion 11 and the floor surface 11b of the horizontal portion 12 are provided with a protruding floor surface portion 13b that protrudes upward toward the protruding ceiling portion.
The upper end portion 13c of the protruding floor surface portion 13b is located above the upper end portion 10a of the doorway 10 by the vertical dimension H4.

At this time, the conveyor chain 2 that moves in the front-rear direction while the design product 1 is suspended extends obliquely upward along the inclined portion 11 from the entrance 10 and extends horizontally inside the hot air leakage preventing portion 13. , Extending obliquely downward toward the horizontal portion 12 and then extending horizontally inside the horizontal portion 12.
A portion of the conveyor chain 2 that extends horizontally inside the hot air leakage prevention portion 13 is arranged so that the lower end of the suspended design product 1 does not contact the upper end portion 13c of the protruding floor surface portion 13b. The direction position is determined.

Thereby, the hot air A supplied from the combustion device 6 and staying in the horizontal portion 12 is transferred to the inclined portion 11 to the upper end portion 10a of the inlet / outlet port 10 below the upper end portion 13c of the protruding floor surface portion 13b. Since it does not descend along, it does not leak out of the furnace.
Therefore, it is possible to reliably prevent the heat energy possessed by the hot air A from being lost, increasing the fuel consumed by the combustion device 6 and increasing the running cost.

Second Embodiment Next, a mountain-shaped drying furnace according to a second embodiment will be described with reference to FIG.

  The mountain-shaped drying furnace 110 of the second embodiment shown in FIG. 2 is different in that the protruding floor surface portion 13 b in the mountain-shaped drying furnace 100 of the first embodiment described above is replaced with a fixed wall 14. ing.

More specifically, the floor 12b of the horizontal portion 12 is provided with a fixed wall 14 that extends upward toward the protruding ceiling portion 13a.
The fixed wall 14 is dimensioned in the vertical direction so that the upper end portion 14a does not come into contact with the lower end of the design article 1 that is suspended and moved by the conveyor chain 2.
The upper end portion 14a of the fixed wall 14 is positioned above the upper end portion 10a of the entrance 10 by the vertical dimension H5.

Thereby, the hot air A supplied from the combustion device 6 and staying in the horizontal portion 12 is moved along the inclined portion 11 to the upper end portion 10a of the entrance 10 below the upper end portion 14a of the fixed wall 14. Since it does not descend, it does not leak out of the furnace.
Therefore, it is possible to reliably prevent the heat energy possessed by the hot air A from being lost, increasing the fuel consumed by the combustion device 6 and increasing the running cost.
In addition, since the fixed wall 14 is erected on the floor 12b of the horizontal portion 12, the existing mountain drying furnace can be easily modified.

3rd Embodiment Next, with reference to FIG. 3 and FIG. 4, the mountain type drying furnace of 3rd Embodiment is demonstrated.

  The mountain-shaped drying furnace 120 according to the second embodiment shown in FIGS. 3 and 4 is different from the mountain-shaped drying furnace 110 according to the second embodiment described above in that the hot air leakage prevention portion 13 is not provided and is fixed. The difference is that the wall 14 is replaced by a movable wall 15 that can be raised and lowered.

That is, since the space | interval of the front-back direction of the horizontal beam 9b of the ceiling beam 9 is narrow, the hot air leakage prevention part 13 cannot be provided.
As a result, the conveyor chain 2 that moves in the front-rear direction while the design product 1 is suspended extends obliquely upward along the inclined portion 11 from the entrance 10, and then immediately extends horizontally inside the horizontal portion 12. It is not possible to obtain a large vertical gap between the lower end of the suspended design article 1 and the floor 12b of the horizontal portion 12.

Therefore, in the mountain-shaped drying furnace 120 of the third embodiment, the ascending position (FIG. 3) projecting upward from the floor surface 12b of the horizontal portion 12 and the descending position descending to a position that does not hinder the movement of the design product 1 A movable wall 15 that can move up and down between the position (FIG. 4) is provided.
An air cylinder 16 is provided below the horizontal portion 12 in order to raise and lower the movable wall 15.

The movable wall 15 closes at least the lower portion of the moving path of the design product 1 in the horizontal portion 12 in the ascending position (FIG. 3), and the upper end portion 15a is connected to the upper end portion 10a of the entrance / exit 10. On the other hand, it is positioned above the vertical dimension H6.
Thereby, the hot air A supplied from the combustion device 6 and staying in the horizontal portion 12 is moved along the inclined portion 11 to the upper end portion 10a of the inlet / outlet 10 below the upper end portion 15a of the movable wall 15. Since it does not descend, it does not leak out of the furnace.
Therefore, it is possible to reliably prevent the heat energy possessed by the hot air A from being lost, increasing the fuel consumed by the combustion device 6 and increasing the running cost.

Further, when the design product 1 suspended and moved by the conveyor chain 2 approaches the movable wall 15, the air cylinder 16 is shortened by a command from a control means (not shown), and the movable wall 15 is lowered. Will not be disturbed.
The stroke when the air cylinder 16 is shortened is preferably set to a minimum value so that the upper end 15a of the movable wall 15 does not contact the lower end of the design product 1.
Thereby, it is possible to minimize the movement of the hot air A staying in the horizontal portion 12 toward the inclined portion 11.

4th Embodiment Next, with reference to FIG. 5 and FIG. 6, the mountain type drying furnace of 3rd Embodiment is demonstrated.

  5 and 6, the mountain drying furnace 130 according to the fourth embodiment has a rotating shaft in which the movable wall 15 that moves up and down extends in the vertical direction with respect to the mountain drying furnace 120 according to the third embodiment described above. It is different in that it is replaced by a rotating wall 20 that rotates around the.

  More specifically, the rotating wall 20 includes a pair of left and right fixed walls 21a and 21b that project from the inner wall surfaces of the left and right side walls 12c and 12d of the horizontal portion 12 and extend in the left and right direction, and these fixed walls 21a. , 21b and a pair of left and right rotating shafts 22a, 22b respectively extending in the vertical direction, and a pair of left and right rotating portions 23a, 23b having base ends fixed to these rotating shafts 22a, 22b, Rotating means 24 that drives and rotates the pair of left and right rotating shafts 22a and 22b.

The pair of left and right rotating parts 23a and 23b are arranged in the horizontal part 12 as shown in FIGS. 5 and 6 (a) when the design article 1 suspended and moved by the conveyor chain 2 is not approaching. The closed position which closes at least a lower part among the movement paths of the design article 1 is taken.
At this time, the upper end of the rotating wall 20 is positioned above the upper end portion 10a of the entrance 10 by the vertical dimension H7.
Thereby, the hot air A supplied from the combustion device 6 and staying in the horizontal portion 12 descends along the inclined portion 11 to the upper end portion 10a of the entrance 10 below the upper end of the rotating wall 20. There is no leakage and no leakage outside the furnace.
Therefore, it is possible to reliably prevent the heat energy possessed by the hot air A from being lost, increasing the fuel consumed by the combustion device 6 and increasing the running cost.

On the other hand, when the design article 1 that is suspended and moved by the conveyor chain 2 approaches the turning wall 20, the turning means 24 is operated by a command from a control means (not shown), and the pair of left and right turning shafts 22a and 22b are moved. Drive and rotate without 90 degrees.
Then, since the pair of left and right rotating portions 23a and 23b are opened to the left and right as shown in FIG. 6B, the movement of the design product 1 in the front-rear direction is not hindered.

  The fourth embodiment has a structure in which a pair of left and right rotation shafts 22a and 22b extending in the up-down direction is rotated. However, by rotating one rotation shaft extending horizontally in the left-right direction, 1 It is also possible to adopt a structure in which the two rotating parts are undulated with respect to the floor surface 12 a of the horizontal part 12.

Fifth Embodiment Next, a mountain type drying furnace according to a fifth embodiment will be described with reference to FIG.

  The mountain-shaped drying furnace 140 of the fifth embodiment shown in FIG. 7 uses a plurality of closing bodies that circulate along a predetermined circulation path extending in the front-rear direction.

More specifically, a pair of front and rear rotating shafts 31a and 31b are arranged in the horizontal portion 12 so as to be spaced apart in the moving direction of the design product 1 and extend in the vertical direction.
Further, an endless belt-like support body 32 is wound around these rotary shafts 31a and 31b so as to circulate around the pair of front and rear rotary shafts 31a and 31b in the clockwise direction in the drawing.
Further, the base ends of the plurality of closing bodies 33A, 33B, and 33C are fixed to the support body 32, respectively, so as to close the lower portion of the moving path of the design product 1 in the horizontal portion 12.
In addition, below the horizontal portion 12, circulation driving means (not shown) is provided that rotationally drives the pair of front and rear rotating shafts 31 a and 31 b in conjunction with the movement of the design product 1.

Thereby, at a certain point in time, as shown in FIG. 7 (a), one closing body 33C is located between the pair of front and rear design products 1, 1, and two closing bodies 33A, 33B is located, and the lower part of the moving path of the design product 1 in the horizontal part 12 is closed.
On the other hand, at the next time point, as shown in FIG. 7 (b), one design article 1 is sandwiched between two closing bodies 33C and 33B in the front-rear direction, and one closing body is provided on the opposite side. 33A is located and the lower part of the moving path of the design article 1 in the horizontal part 12 is closed.

At this time, the upper end portions of these closing bodies 33A, 33B, 33C are located above the upper end portion 10a of the doorway 10 by the vertical dimension H7 as in the case of the rotating wall 20 shown in FIG. positioned.
Thereby, the hot air A supplied from the combustion device 6 and staying in the horizontal portion 12 is inclined to the upper end portion 10a of the inlet / outlet 10 below the upper end portions of the closing bodies 33A, 33B, 33C. So that it does not fall out of the furnace.
Therefore, it is possible to reliably prevent the heat energy possessed by the hot air A from being lost, increasing the fuel consumed by the combustion device 6 and increasing the running cost.

6th Embodiment Next, with reference to FIG. 8, the mountain type drying furnace of 6th Embodiment is demonstrated.

  The mountain-shaped drying furnace 150 of the sixth embodiment shown in FIG. 8 has a plurality of closures that circulate along a predetermined circulation path extending in the front-rear direction, like the mountain-shaped drying furnace 140 of the fifth embodiment described above. Although the body is used, it is different in that the rotation axis extends horizontally in the left-right direction.

More specifically, a pair of front and rear rotating shafts 41a and 41b extending in the left-right direction are arranged in the vicinity of the floor 12b of the horizontal portion 12 so as to be spaced apart in the moving direction of the design product 1. ing.
Further, an endless belt-like support body 42 is wound around these rotary shafts 41a and 41b so as to circulate around the pair of front and rear rotary shafts 41a and 41b in the counterclockwise direction in the drawing.
Further, the base ends of the plurality of closing bodies 43A, 43B, 43C, and 43D are fixed to the support body 42, respectively, so that the lower portion of the moving path of the design product 1 in the horizontal portion 12 can be closed. Yes.
In addition, the right side wall 12c of the horizontal portion 12 is provided with a circulation driving means 44 that rotationally drives the pair of front and rear rotating shafts 41a and 41b in conjunction with the movement of the design product 1.

  As a result, as shown in FIG. 7 (b), the plurality of closing bodies 43A, 43B, 43C, 43D stand up from one to the other in conjunction with the movement of the design product 1 in the front-rear direction. 12, the lower part of the movement path of the design product 1 is closed.

At this time, the upper end portions of these closing bodies 43A, 43B, 43C, and 43D are as much as the vertical dimension H7 with respect to the upper end portion 10a of the entrance 10 as in the case of the rotating wall 20 shown in FIG. Located above.
Thereby, the hot air A supplied from the combustion device 6 and staying in the horizontal portion 12 is inclined to the upper end portion 10a of the inlet / outlet 10 below the upper end portions of the closing bodies 33A, 33B, 33C. So that it does not fall out of the furnace.
Therefore, it is possible to reliably prevent the heat energy possessed by the hot air A from being lost, increasing the fuel consumed by the combustion device 6 and increasing the running cost.

DESCRIPTION OF SYMBOLS 1 Design goods 2 Conveyor chain 3 Pretreatment booth 4 Drying furnace 5 Coating booth 6 Combustion device 10 Entrance / exit 11 Inclined part 12 Horizontal part 13 Hot air leak prevention part 14 Fixed wall 15 Movable wall 16 Air cylinder (elevating means)
DESCRIPTION OF SYMBOLS 20 Rotating wall 21 Fixed wall 22 Rotating shaft 23 Rotating part 24 Rotating means 31 Rotating shaft 32 Support body 33 Closure body 41 Rotating shaft 42 Support body 43 Closing body 44 Circulation drive means 100 Mountain type drying of 1st Embodiment Furnace 110 Mountain-shaped drying furnace 120 of the second embodiment Mountain-shaped drying furnace 130 of the third embodiment Mountain-shaped drying furnace 140 of the fourth embodiment Mountain-shaped drying furnace 150 of the fifth embodiment Mountain-shaped drying of the sixth embodiment Furnace

Claims (10)

A mountain-type drying furnace used for painting elevator design products,
An inclined portion extending obliquely upward from the doorway;
A horizontal portion connected to the upper end of the inclined portion and extending horizontally;
Hot air supply means for supplying hot air into the horizontal portion;
Hot air leakage prevention means provided at a connecting portion between the inclined portion and the horizontal portion, which prevents hot air staying in the horizontal portion from leaking out of the furnace through the inclined portion through the inclined portion. When,
A mountain drying oven characterized by comprising: The hot air leakage prevention means is
A projecting ceiling portion that projects upward through a gap between ceiling beams provided above the mountain-shaped drying furnace, and that is connected to the ceiling of the horizontal portion and the inclined portion;
A protruding floor surface portion protruding upward from the floor surface of the horizontal portion and the inclined portion toward the protruding ceiling portion;
The mountain-type drying furnace according to claim 1, wherein The hot air leakage prevention means is
A projecting ceiling portion connected to the ceiling of the horizontal portion and the inclined portion, which protrudes upward through a gap between ceiling beams provided above the horizontal portion and the inclined portion;
A fixed wall that protrudes from the floor surface of the horizontal portion or the floor surface of the inclined portion and extends toward the protruding ceiling portion;
The mountain-type drying furnace according to claim 1, wherein The hot air leakage prevention means is
Projecting upward from the floor surface of the horizontal portion or the inclined portion, and a rising position for closing a lower portion of the moving path of the design product in the horizontal portion or the inclined portion, and movement of the design product A movable wall that can be raised and lowered between a lowered position that has been lowered to an unobstructed position;
Elevating means for driving the movable wall to move up and down;
The mountain-type drying furnace according to claim 1, wherein The hot air leakage prevention means is
A rotating wall that is rotatable between a closed position that closes a lower portion of the moving path of the design product in the horizontal portion or the inclined portion, and an open position that does not hinder the movement of the design product,
Rotation means for driving the rotation wall to reciprocate between the closed position and the open position;
The mountain-type drying furnace according to claim 1, wherein   The mountain-shaped drying furnace according to claim 5, wherein the rotating wall rotates around a support shaft extending in a vertical direction.   6. The mountain drying furnace according to claim 5, wherein the rotating wall rotates around a support shaft extending in a horizontal direction. The hot air leakage prevention means is
A pair of front and rear rotating shafts arranged at intervals in the moving direction of the design product inside the horizontal portion or the inclined portion;
A support means wound endlessly on the pair of front and rear rotating shafts and circulating around the pair of front and rear rotating shafts;
A plurality of closing bodies whose base ends are fixed to the support means, respectively, for closing a lower portion of the moving path of the design product in the horizontal portion or the inclined portion;
By rotating and driving the pair of front and rear rotating shafts, circulation driving means for circulating and moving the plurality of closing bodies in the front-rear direction in conjunction with the movement of the design product,
The mountain-type drying furnace according to claim 1, wherein   The mountain-shaped drying furnace according to claim 8, wherein the pair of front and rear rotating shafts extend in a vertical direction.   The mountain-shaped drying furnace according to claim 8, wherein the pair of front and rear rotating shafts extend in a horizontal direction.

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