Coating drying oven with improved drying thermal efficiency

Abstract

The present invention relates to a coating drying oven with improved drying thermal efficiency, and exhibits the effect of improving the drying efficiency of a workpiece and reducing energy consumption through an insulating structure that minimizes internal heat loss. The drying furnace of the present invention for realizing this is characterized by comprising: a drying furnace body (10) forming an internal space of a certain length for drying a coated object (P); a moving conveyor (20) that moves horizontally along the interior of the drying furnace body (10) while the object (P) is mounted thereon; a hot air supply duct (30) provided inside the drying furnace body (10) for supplying high-temperature hot air to the object (P); a hot air recovery duct (40) for recovering the hot air supplied through the hot air supply duct (30) and passing through the moving conveyor; and a conveyor insulation cover (50) provided on the moving conveyor (20) to perform a function of blocking the hot air.

Description

Technology Field

[0001] The present invention relates to a drying oven for painting, and more specifically, to a structure for a drying oven for painting that improves drying efficiency by minimizing heat loss during the process of drying painted industrial parts. Background Technology

[0003] Generally, in the production process of automobiles (bodywork and parts made of various materials) and industrial machinery, the surface paint application and drying processes are performed sequentially as a final step.

[0004] Meanwhile, in the drying process, the material to be dried is dried using high-temperature hot air generated inside the drying oven, and it is important to minimize heat loss through the walls and conveying structure of the drying oven.

[0005] However, in conventional drying ovens, heat is conducted along the steel structures or reinforcements supporting the panels, resulting in external loss and increased energy costs; consequently, a technical structure is required to minimize heat loss in the drying oven. Prior art literature

[0007] Republic of Korea Patent Registration No. 1497731 (Registered on Feb. 24, 2015) Republic of Korea Patent Registration No. 0259456 (Registered on Dec. 20, 2001) The problem to be solved

[0008] The present invention is proposed to improve upon the problems of the aforementioned conventional technology, and aims to improve thermal efficiency and reduce energy costs by minimizing the loss of high-temperature hot air generated in the drying oven and concentrating the hot air on the object to be dried. means of solving the problem

[0010] The drying furnace for painting according to the present invention for achieving the above purpose is characterized by comprising: a drying furnace body forming an internal space of a certain length for drying a painted object; a moving conveyor that moves along the interior of the drying furnace body while the object is mounted thereon; a hot air supply duct provided inside the drying furnace body to supply high-temperature hot air to the object to be dried; a hot air recovery duct that recovers the hot air supplied through the hot air supply duct and passed through the moving conveyor; and a conveyor insulation cover provided on the moving conveyor to perform a hot air blocking function. Effects of the invention

[0012] The coating drying furnace of the present invention exhibits the effect of improving the drying efficiency of the workpiece and reducing energy consumption through an insulating structure that minimizes internal heat loss.

[0013] In addition, the double insulation structure of the drying oven allows for the replacement of only the outer panel in the event of external damage to the drying oven, thereby offering the advantage of reducing maintenance costs. Brief explanation of the drawing

[0015] FIG. 1 is a cross-sectional structural diagram of a drying oven according to one embodiment of the present invention. FIG. 2 is an enlarged view of the conveyor moving part in the present invention. Figure 3 is an enlarged view of section A of Figure 1. Figure 4 is a comparison photo of the conveyor insulation cover before and after installation in the present invention. Figure 5 is a photograph of the drying oven panel manufacturing process in the present invention. FIG. 6 is an enlarged cross-sectional view of a drying oven wall according to another embodiment of the present invention. FIG. 7 is a detailed structural diagram of an elastic block according to another embodiment of the present invention. FIG. 8 is an enlarged cross-sectional view of a conveyor insulation cover according to another embodiment of the present invention. FIG. 9 is a detailed cross-sectional view of a conveyor insulation cover installation part according to another embodiment of the present invention. Specific details for implementing the invention

[0016] Hereinafter, specific embodiments of the present invention will be examined in detail with reference to the attached drawings.

[0017] Embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be interpreted as being limited to the embodiments described in detail below. These embodiments are provided to more fully explain the present invention to those with average knowledge in the art.

[0018] Accordingly, the shapes of components depicted in the drawings may be exaggerated to emphasize clearer explanations. It should be noted that identical components in each drawing may be illustrated with the same reference numeral. Furthermore, detailed descriptions of functions and configurations of known technology that are deemed to unnecessarily obscure the essence of the invention may be omitted.

[0019] First, the structure of a coating drying oven with improved drying thermal efficiency according to one embodiment of the present invention is as follows through FIGS. 1 to 4.

[0020] The drying oven in the present embodiment comprises a drying oven body (10) forming an internal space of a certain length for drying a coated object (P), a moving conveyor (20) that moves horizontally along the inside of the drying oven body (10) while the object (P) is mounted thereon, a hot air supply duct (30) provided inside the drying oven body (10) to supply high-temperature hot air to the object (P), a hot air recovery duct (40) that recovers the hot air supplied through the hot air supply duct (30) and passed through the moving conveyor, and a conveyor insulation cover (50) provided on the moving conveyor (20) to perform the function of blocking hot air loss.

[0021] At this time, it can be seen that the main body (10) of the above-mentioned drying oven has a double insulation structure in which a thermal insulation layer (13) is formed between two inner and outer insulation panels (11, 12), and a corner finishing frame (10') for preventing gaps is provided at the outer corner portion.

[0022] In the drawing, unexplained reference numeral 15 is an internal frame, and 21 represents an object mounting rod on which a drying object (P) is mounted.

[0023] Let us examine the effects of operation according to the coating drying oven of the present invention having such a configuration.

[0024] In the drying furnace of the present invention, hot air drying is performed while the drying object (P), which has undergone a prior painting process, is mounted on the object mounting rod (21) and moves along a certain length of internal path of the drying furnace by the operation of the moving conveyor (20).

[0025] That is, when high-temperature hot air is supplied through the hot air supply duct (30) provided on both upper sides of the drying oven body (10), the object to be dried (P) mounted on the object mounting rod (21) provided on the moving conveyor (20) moves along the drying oven and is dried by the action of the hot air, and subsequently, the hot air is recovered through the hot air recovery duct (40) and internal circulation is achieved.

[0026] At this time, in the present invention, a conveyor insulation cover (40) is provided in a horizontal position at the installation site of the moving conveyor (20) at the bottom of the drying oven, thereby preventing loss caused by hot air flowing into the lower space and improving drying efficiency through the hot air reflection action.

[0027] In addition, the main body of the drying oven in the present invention has a double insulation structure in which a thermal insulation layer (13) is formed between two inner and outer insulation panels (11, 12), thereby improving insulation efficiency and preventing heat loss. Furthermore, it can be seen that maintenance costs can be reduced by replacing only the inner and outer insulation panels (11, 12) in the event of damage to the outer surface or a part of the outer surface of the drying oven.

[0028] Therefore, the coating drying furnace of the present invention exhibits the effect of improving the drying efficiency of the workpiece to be dried and reducing energy consumption through an insulating structure that minimizes internal heat loss.

[0029] In addition, the double insulation structure of the drying oven allows for the replacement of only the outer panel in the event of external damage to the drying oven, thereby offering the advantage of reducing maintenance costs.

[0031] Meanwhile, FIGS. 6 to 9 show the configuration of a drying furnace according to another embodiment of the present invention, wherein the inner insulation panel (11) is filled with mineral wool, which is a fibrous insulation material, and the outer insulation panel (12) is filled with ceramic fiber, which is a fire-resistant insulation material. In the insulation layer (13), elastic blocks (14) of a multilayer structure are provided at regular intervals, wherein fluororubber, which has excellent heat resistance and insulation properties, and EDPM rubber, which has excellent water resistance and elastic recovery properties, are bonded together to elastically support the insulation panels (11, 12) on both sides.

[0032] In addition, the upper surface of the conveyor insulation cover (50) is provided with a continuous sawtooth-shaped uneven surface (51) to allow for diffuse reflection of hot air, and a heat-reflecting layer (51a) is formed on the surface of the uneven surface (51) to improve drying efficiency.

[0033] At this time, the heat reflective layer (51a) preferably has a mixed composition in the ratio of 20-40% by weight of melamine resin with excellent heat resistance, 5-20% by weight of nano silver powder with excellent heat reflectivity, 1-10% by weight of glass wool, 10-20% by weight of cetyltrimethylammonium bromide, 5-15% by weight of tricresyl phosphate, 1-10% by weight of DGME (diethylene glycol monoethyl ether), 1-10% by weight of chloramphenicol, and 1-5% by weight of polycaprolactone.

[0034] Additionally, a guide passage (60) for the movement of the moving conveyor (20) is formed in the conveyor insulation cover (50), and curved plate springs (70) are provided on both sides of the guide passage (60). It can be seen that the plate springs (70) are configured with a friction support brush (71) that prevents movement and removes foreign substances due to friction with an object mounting rod (21) that moves by the moving conveyor (20).

[0035] With this configuration, mineral wool is filled in the inner insulation panel (11), and ceramic fiber, which is a fire-resistant insulating material, is individually filled in the outer insulation panel (12), thereby improving thermal shock resistance and noise blocking effects.

[0036] In addition, the insulation layer (13) is equipped with a multilayer elastic block (14) having a structure in which fluororubber and EDPM rubber are integrally provided, so that the inner insulation panel (11) and the outer insulation panel (12) can be elastically supported, thereby improving structural stability and preventing deformation and shrinkage of the elastic block (14).

[0037] In addition, since a heat-reflecting layer (51a) is formed on the sawtooth-shaped uneven surface (51) formed on the upper surface of the conveyor insulation cover (50), it exhibits the advantage of reducing drying time due to improved heat reflection efficiency.

[0038] In particular, since glass wool is mixed into the heat-reflective layer (51a), the coating stability of the melamine resin can be improved and the coating durability can be enhanced. Cetyltrimethylammonium bromide performs the function of preventing static electricity generation, and tricresyl phosphate performs the function of improving surface flatness and preventing oxidation during the formation of the heat-reflective layer (51a). Additionally, the added DGME improves the coating density through the catalytic function of the melamine resin, and chloramphenicol and polycaprolactone each exhibit advanced effects of suppressing bubble generation during the composition application process and suppressing surface cracks through improved adhesion efficiency.

[0039] In addition, since the guide passage (60) through which the object mounting rod (21) moves along with the moving conveyor (20) is equipped with a plate spring (70) and a friction support brush (71) for elastic support, the phenomenon of the object mounting rod (21) tilting during movement is prevented and stable support is achieved, and the advantage of preventing foreign substances such as dust or oil stains from adhering to the object mounting rod (21) is also provided.

[0041] Furthermore, although specific embodiments of the present invention have been described and illustrated above, it is obvious that the structure of the coating drying furnace of the present invention can be implemented with various modifications by those skilled in the art.

[0042] However, such modified embodiments should not be understood separately from the technical spirit or scope of the present invention, and such modified embodiments should be considered to be included within the appended claims of the present invention. Explanation of the symbols

[0044] 10: Drying oven main body 20: Moving conveyor 30 : Hot air supply duct 40 : Hot air return duct 50 : Conveyor insulation cover 60 : Guide passage P : Dry object

Claims

Claim 1 A drying oven for painting with improved drying thermal efficiency, characterized by comprising: a drying oven body (10) forming an internal space of a certain length for drying a painting object (P); a moving conveyor (20) that moves horizontally along the interior of the drying oven body (10) while the painting object (P) is mounted thereon; a hot air supply duct (30) provided inside the drying oven body (10) to supply high-temperature hot air to the painting object (P); a hot air recovery duct (40) that recovers the hot air supplied through the hot air supply duct (30) and passed through the moving conveyor; and a conveyor insulation cover (50) provided on the moving conveyor (20) to perform a hot air blocking function, wherein the upper surface is provided with a continuous sawtooth-shaped uneven surface (51) to allow diffuse reflection of the hot air, and a heat-reflecting layer (51a) is formed on the surface of the uneven surface (51) to improve drying efficiency. Claim 2 A drying oven for painting with improved drying thermal efficiency according to claim 1, wherein the drying oven body (10) forms a double insulation structure in which an insulating layer (13) is formed between two inner and outer insulation panels (11, 12), and a corner finishing frame (10') for preventing gaps is provided at the outer corner portion. Claim 3 A drying oven for painting with improved drying thermal efficiency according to claim 2, wherein the inner insulation panel (11) is filled with mineral wool and the outer insulation panel (12) is filled with ceramic fiber, and the insulation layer (13) is provided at regular intervals with elastic blocks (14) of a multilayer structure integrally formed by bonding together fluororubber with excellent heat resistance and insulation properties and EDPM rubber with excellent water resistance and elastic recovery properties to elastically support both insulation panels (11, 12). Claim 4 delete Claim 5 A drying oven for painting with improved drying thermal efficiency, characterized in that, in claim 1, a guide passage (60) for the movement of a moving conveyor (20) is formed in the conveyor insulation cover (50), and curved plate springs (70) are provided on both sides of the guide passage (60), and the plate springs (70) are configured with a friction support brush (71) that prevents movement and removes foreign substances due to friction and a rod (21) for holding objects that are moved by the moving conveyor (20).

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