JP5060234B2 - Paint drying apparatus and paint drying method using the same - Google Patents

Description

  The present invention relates to a paint drying apparatus used in a drying process in coating a workpiece and a paint drying method using the same, and more specifically, a paint drying apparatus capable of greatly reducing the drying time and a paint drying using the same. Regarding the method.

  As is well known, when coating an object to be coated (hereinafter referred to as “work”), it is necessary to apply a paint to the work with a spray gun or the like and then dry the applied paint to fix it on the work. Conventionally, this drying is performed by blowing hot air onto the workpiece after putting the workpiece coated with the paint into the drying oven using a drying oven.

  However, in general, it takes about 40 minutes to make the inside of the drying furnace about 160 degrees, so in hot air drying, the drying time takes a long time, and this increases the entire coating time. The problem can be pointed out.

  Further, in the drying in the drying furnace, toxic gas is generated, so that the toxic gas needs to be exhausted, and the drying furnace is ventilated, which causes heat loss. The time until the inside of the drying furnace reaches a predetermined temperature is prolonged.

Therefore, a drying method using high-frequency induction heating has been proposed as a method for solving the problem of drying with hot air.
JP 2006-130384 A JP 2004-2965 A JP 2003-10737 A JP 2002-126584 A JP-A-8-90055 JP-A-7-132268 Japanese Patent Laid-Open No. 7-80401 Japanese Patent Laid-Open No. 7-24401 JP-A-6-121963 JP-A-6-432 JP-A-5-104059

  By the way, when a work is dried by induction heating, the work can be heated and dried uniformly in a short time. At this time, fats and oils etc. on the surface of the work are vaporized by heating the work itself, Further, toxic gases such as solvent and formaldehyde are generated in the process of being dried and the paint is dried. Therefore, it is necessary to treat these gases by some method. However, conventionally, no means has been proposed for effectively solving the problem of contamination due to gas or the like.

  Therefore, an object of the present invention is to provide a drying apparatus that can significantly reduce the time required for a drying process and can ensure the safety of an operator in painting a workpiece.

  The paint drying apparatus of the present invention is a drying apparatus for drying a paint applied to a work in a drying process in the painting of a work, and includes a support column and a heating coil connected in an insulated state to the support column. An exhaust duct having an opening disposed above the heating coil, and a power supply means for supplying current to the heating coil, and drying the work placed near the heating coil to a high temperature by induction heating The paint drying method of the present invention using this drying apparatus is characterized in that a work is disposed in the vicinity of the heating coil, an electric current is applied to the heating coil, the work is rotated, and induction heating is performed. The workpiece is dried at a high temperature, and the gas generated by the drying is absorbed from the exhaust duct.

  In the drying apparatus of the present invention, since the heating coil is connected to the support column, a conductive work is disposed in the vicinity of the heating coil and the heating coil is energized so that the lines of magnetic force generated around the heating coil are generated. By passing through, Joule heat is generated in the work, and the work can be heated and dried.

  According to the experiments by the present inventors, when a work that took about 30 minutes to reach 160 degrees when heated air was applied was heated by the above method, the time required for the work to reach 200 degrees was little. It was 3 minutes.

  Therefore, the time required for drying can be greatly shortened by using the coating material drying apparatus of the present invention in the drying process in the coating of the workpiece.

  Further, in the present invention, the exhaust duct having an opening disposed above the coil is provided, and the gas generated by induction heating can be recovered from the exhaust duct. Therefore, the gas generated by heating the workpiece is diffused. It is possible to prevent the occurrence of the failure and ensure the safety of the worker.

  The paint drying apparatus of the present invention has two struts arranged at intervals and in communication with each other, and a heating coil is attached to the struts via a support arm in an upper portion of the struts. It is supported in an insulated state.

  Further, the paint drying apparatus of the present invention is provided with an exhaust duct, and the end of the exhaust duct is opened near the central portion of the coil.

  Further, the paint drying apparatus of the present invention includes power supply means, and this power supply means has a power supply to be supplied to the heating coil and a control base for adjusting the amount of current applied to the heating coil. .

  Here, at least a cover may be disposed above the coil, or a cover may be disposed below the heating coil.

  Moreover, while using a hollow pipe material as said heating coil, it is good to make it possible to put cooling water in the heating coil of this pipe material, and it can prevent that the whole apparatus becomes high temperature.

  Next, in the paint drying method using the paint drying apparatus configured as described above, a work is disposed in the vicinity of the coil, and in this state, an electric current is applied to the coil and the work is heated to a high temperature by induction heating. dry. At the same time, the workpiece is rotated so that the magnetic field lines are applied to the entire workpiece. Further, the toxic gas is prevented from diffusing around by sucking the gas generated by drying from the exhaust duct.

  An embodiment of the paint drying apparatus of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view of the paint drying apparatus of the present embodiment, and FIG. 2 is an enlarged view of the paint drying apparatus of the present embodiment. It is a disassembled perspective view shown disassembled.

  In the figure, reference numeral 1 denotes the paint drying apparatus of the present embodiment, and the paint drying apparatus 1 of the present embodiment is composed of a drying apparatus main body and a power supply device as power supply means.

  That is, in the figure, reference numeral 2 denotes a power supply device. In the present embodiment, the power supply device 2 is provided with a power supply for supplying to the drying apparatus main body and a control means for controlling the power supply to be supplied. An operation switch (not shown) is provided.

  Next, 3 is a drying apparatus main body in the figure, and in the present embodiment, the drying apparatus main body 2 has two pole-shaped support posts 4 arranged at intervals. The upper portion is connected by a connecting arm 5, and a support arm 6 is connected to each upper portion in the same direction.

  The support arm 5 supports the heating coil 7, and by energizing the heating coil 7, it is possible to generate lines of magnetic force around the heating coil.

  Here, the heating coil will be described. In FIG. 2, 7 is a heating coil, and FIG. 4 is a plan view of the heating coil 6. In this embodiment, the heating coil 6 is a trunk pipe having a diameter of 20 mm. It is possible to put cooling water inside. Both ends are connected to the power supply device 2 and a substantially rectangular spiral is formed below the support arm 5. That is, while the heating coil 7 extending from one end 7a is formed in a substantially rectangular spiral shape, the other end portion 7b is extended upward from the vicinity of the spiral central portion and then connected to the power supply device 2. Is configured.

  The heating coil 7 has a plurality of connecting bolts 701 projecting from the upper surface of the heating coil 7 at a location facing the support arm 6, and by connecting the bolts 701 to the support arm 6, The heating coil 7 is supported by the support arm 6.

  Furthermore, the heating coil 7 forms a substantially rectangular space 702 at the center thereof, and the gas generated by heating the workpiece is absorbed through the space 702.

  A mountain-shaped hood 8 is disposed above the space 702, and an exhaust duct 9 is provided behind the hood 8 via a connection hole (not shown) formed on the back surface of the hood 8. The exhaust duct 9 is provided with a suction fan or the like (not shown), so that the air below the space 9 can be sucked and exhausted through the hood 8 and the duct 9.

  Next, 10 in FIG. 1 is an upper cover. That is, the paint drying apparatus 1 of the present embodiment has an upper cover 10 disposed above the heating coil 7, and the coil 7 is protected by the upper cover 10.

  Here, FIG. 3 is a perspective view showing the upper cover 10 from the back side. In this embodiment, the upper cover 10 has a hollow box lid shape, and the support arm 6 penetrates the back side thereof. A supporting arm through groove 1001, a duct through hole 1002 through which the duct 9 penetrates, and a heating coil through groove 1003 through which the proximal end portion of the heating coil 7 penetrates are formed.

  On the other hand, the heating coil 7 is connected to a plurality of first support frames 16 on the upper surface thereof, and a second support frame 15 is connected to the first support frame 16. The second support frame 15 is connected to the support arm 6. The upper cover 10 is connected to the second support frame 12 by bolts or the like, and thus the upper cover 10 is disposed above the heating coil 7. In FIG. 2, reference numeral 11 denotes a frame material arranged in the upper cover 10.

  Next, in the figure, reference numeral 12 denotes a lower cover. That is, the coating material drying apparatus 1 of the present embodiment has a lower cover 12 disposed on the lower side of the heating coil 7. The lower cover 12 is flat and has a plurality of bolt holes 1201. The lower cover 12 is supported by the heating coil 7 by connecting a bolt 703 protruding from the lower surface of the heating coil 7 to the bolt hole 1201.

  The lower cover 12 has a substantially rectangular suction window 1202 at a location facing the space 702 of the heating coil 7. As a result, the air below the lower cover 12 can be sucked through the suction window 1202, the space 702, the hood 8, and the exhaust duct 9.

  In the present embodiment, the upper cover 10 and the lower cover 12 are both made of FRP, but this material is not particularly limited, and the upper cover 10 and the lower cover 12 may not be provided.

  Next, a paint drying method using the paint drying apparatus 1 of the present embodiment configured as described above will be described with reference to FIG. 5. In the paint drying method of the present embodiment, it occurs around the heating coil 7. At a distance through which the magnetic lines of force can pass, a work is disposed below the lower cover 12, the heating coil 7 in which cooling water is circulated is energized, and the work is rotated. The workpiece is dried at a high temperature.

  That is, in FIG. 5, reference numeral 13 denotes a work supply device. The work supply device 13 is connected to an arm 1301, a main shaft 1302 that is pivotably connected to the arm upward, and an upper portion of the main shaft 1302. The rotary table 1303 is provided. In addition, a belt (not shown) for rotating the main shaft 1302 is built in the arm 1301, and the main shaft 1302 and a rotary table 1303 connected to the main shaft are rotated by rotating the belt with a motor or the like. It can be rotated.

  Then, after the work 14 is arranged on the rotary table 1303, the work 14 can be rotated by rotating the main shaft 1302 and rotating the rotary table 1303 via a motor or the like (not shown).

  Next, a specific example of the paint drying method of the present embodiment will be described. In this embodiment, a case where the paint applied to the casing 14 of the magnesium mobile phone is dried will be described. That is, first, the mobile phone casing 14 is arranged on the peripheral edge of the turntable 1303.

  Next, the rotary table 1303 is rotated using a motor and a belt (not shown), the switch of the power supply device 2 is operated to energize the heating coil 7, and the cooling water is further circulated in the heating coil 7. . Then, magnetic lines of force are generated around the heating coil 7, and eddy currents are generated by passing these lines of magnetic force through the work 14, thereby generating Joule heat in the work 14 and heating the work 14 itself. The workpiece 14 can be dried in a short time, and the time required for the drying process in painting the workpiece can be greatly reduced.

  At this time, in the paint drying apparatus 1 of the present embodiment, the air of the lower cover 12 can be sucked through the exhaust duct 9, so that the oil and grease on the surface of the workpiece 14 are heated by heating the workpiece itself. Even when vaporized, or when toxic gases such as solvent and formaldehyde are generated in the process of drying the paint, these vaporized oils, spears and toxic gases can be sucked and exhausted. It is possible to effectively prevent dust and toxic gas from being diffused into the drying chamber and threatening the safety of workers.

  Furthermore, since induction heating is performed while rotating the workpiece, it is possible to uniformly heat a large number of workpieces simultaneously.

  Further, in this embodiment, since the inside of the heating coil 7 is made hollow so that the cooling water can be circulated, it is possible to prevent the entire apparatus from becoming high temperature, and it is possible to ensure safety.

  Thus, according to the paint drying apparatus 1 and the paint drying method of the present embodiment, it is possible to greatly reduce the time required for the drying process in the coating of the workpiece and to ensure the safety of the operator. .

  In the above-described embodiment, the case where the workpiece is arranged below the lower cover 12, that is, below the heating coil 7, has been described. Any location may be used as long as it is within a distance range in which the magnetic lines of force generated around can pass. Accordingly, a work may be arranged on the side of the heating coil 7 or on the upper side.

  In the above-described embodiment, the case where the fixed work supply device 13 is used has been described. However, the work may be rotated while being moved by a conveyor.

  The present invention dries the paint by induction heating to shorten the drying time and exhausts oil, fat, etc. generated by the heating to ensure the safety of the worker. It can be applied to the entire drying process of paint.

It is a perspective view of the Example of the coating material drying apparatus of this invention. It is a disassembled perspective view of the Example of the coating material drying apparatus of this invention. It is a figure for demonstrating the upper cover in the Example of the coating material drying apparatus of this invention, and has shown the back side perspective view. It is a figure for demonstrating the heating coil in the Example of the coating material drying apparatus of this invention, and has shown the plane. It is a figure for demonstrating the Example of the coating-material drying method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paint drying apparatus 2 Power supply apparatus 3 Drying apparatus main body 4 Support | pillar 5 Connection arm 6 Support arm 7 Heating coil 701 Bolt 702 Space 703 Bolt 8 Hood 9 Exhaust duct 10 Upper cover 1001 Support arm penetration groove 1002 Exhaust duct through-hole 1003 Heating coil penetration Groove 11 Frame 12 Lower cover 13 Work supply device 14 Work 15 and 16 Support frame

Claims (5)

A drying device for drying a paint applied to a workpiece in a drying process in coating the workpiece,
A support column (4), a heating coil (7) supported in an insulated state with respect to the support column (4), an exhaust duct (9) having an opening disposed above the heating coil (7), and the heating And a power supply means (2) for supplying power to the coil (7), wherein the work placed in the vicinity of the coil (7) is heated to high temperature by induction heating and can be dried. Drying equipment.   The paint drying apparatus according to claim 1, wherein an upper cover (10) is disposed above the heating coil (7).   The paint drying apparatus according to claim 1 or 2, wherein a lower cover (12) is disposed below the heating coil (7).   The hollow coil material is used as the heating coil (7), and cooling water can be put into the heating coil (7). Paint drying equipment.   It is a paint drying method using the drying apparatus in any one of Claims 1 thru | or 4, Comprising: A workpiece | work (14) is arrange | positioned in the vicinity of the said heating coil (7), and it supplies with electricity to the said heating coil (7). And the work (14) is rotated, the work is heated to a high temperature by high-frequency induction heating, and the gas generated by the drying is absorbed from the exhaust duct (9).

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