JPS6221343Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an ultraviolet curing paint drying device.

In general, three-dimensional objects such as camera bodies need to be painted for aesthetic purposes or for corrosion protection.

Conventionally, in order to carry out such a painting process, a thermosetting paint is used, which is applied to the surface of the object to be treated, and then heated to a temperature sufficient for the paint to harden and dry. Ta.

Conventionally, a typical device for drying paint is a hot air dryer, which is equipped with a hot air oven that blows hot air onto the object to be treated, and a conveyance mechanism that conveys the object through the hot air oven. A device of the type is known.

However, in such hot air drying equipment, if the temperature of the hot air is too high, the thermal efficiency will decrease and a large amount of heat will be wasted, and the hot air oven will need an insulating structure with high insulation efficiency. In practice, the contact time between the paint applied to the surface of the object to be treated and the hot air is sufficiently long because of the benefits. In order to do this, a problem arises in that the area required for drying, that is, the length of the hot air oven must be increased.

In view of the above-mentioned circumstances, the present inventor focused on ultraviolet curable paint and completed the present invention.
In other words, the purpose of the present invention is to reduce the length of the area required for drying, allow paint to be dried at a high transport speed, and further reduce the risk of explosion and reduce power consumption. The purpose is to provide an ultraviolet curable paint drying device that can provide a good paint finish. a conveyance mechanism for conveying along the
a hot air outlet member disposed to face the conveyance path; a lamp disposed downstream of the hot air outlet member in the conveyance path to face the conveyance path; and an ultraviolet lamp provided thereon; The present invention includes a cooling air supply mechanism that sends air, and an air guiding path member that sends the hot air, which is turned into hot air by the cooling air passing through the lamp, to the hot air outlet member.

Embodiments of the present invention will be described below with reference to the drawings.

In the embodiment shown in FIG. 1, rollers 11A, 11B, 11C, and 11D transport the workpiece, the surface of which is coated with ultraviolet curable paint, along the transport path P.
A conveyance mechanism 1 consisting of an endless belt 12 made of, for example, a net-like body is provided between these, and a plurality of hot air blowing mechanisms are provided on the surface facing the conveyance path P, for example, so as to face the conveyance path P. A hot air outlet member 2 made of a box body having holes 21 is provided, and the hot air outlet member 2 is provided through the conveyance path P.
A hot air suction member 3 made of a box body having a plurality of hot air suction holes 30 on the surface facing the conveyance path P is provided so as to face the conveyance path P.
An air exhaust path member 32 is connected to which an air exhaust fan 31 is provided on the way to exhaust the hot air from here. And hot air outlet member 2 in the conveyance path P
On the more downstream side, a first group 4 of lamps and a second group 5 of lamps are sequentially provided along the transport path P on the upper side of the transport path P, while the first lamp group 5 is provided on the lower side of the transport path P. A third group of lamps 6 and a lamp 7 are provided to face the group of lamps 4 and the second group of lamps 5, respectively. Reference numeral 33 denotes a partition plate that partitions the air exhaust path member 32 and the third group 6 of lamps. The first group 4 of lamps includes two lamps 4 arranged at an angle so as to illuminate the center of the first belt portion P1, which is divided into two in the width direction of the belt 12, as shown in FIG.
Inside these lamps 41 and 42, there is an ultraviolet lamp UL extending along the length direction of the belt 12, and a trough-shaped mirror M having a slit S at the top to cover the ultraviolet lamp UL.
will be provided. The second group of lamps 5 includes two lamps 51 and 52 arranged at an angle so as to illuminate the center of a second belt portion P2, which is divided into two in the width direction of the belt 12, as shown in FIG. It consists of
Inside these lamps 51 and 52, there is a first group 4 of lamps.
An ultraviolet lamp UL and a trough-like mirror M are provided in the same manner as in . The third group of lamps 6 is composed of two lamps 61 and 62 arranged at an angle on both sides of the belt 12 so as to illuminate the center of the belt 12 in the width direction, as shown in FIG.
Inside these lamps 61 and 62, there is a first group 4 of lamps.
An ultraviolet lamp UL and a trough-like mirror M are provided in the same manner as in . Reference numeral 100 in FIGS. 2 and 3 indicates an object to be processed. The lamp 7 is arranged directly below the belt 12 so as to extend in the width direction of the belt 12, and inside the lamp 7 is an ultraviolet lamp UL extending in the width direction of the belt 12, and a slit S is provided at the top of the lamp 7 to cover the ultraviolet lamp UL. A trough-like mirror M is provided. A cooling air supply mechanism 8 for supplying cooling air for cooling the lamp UL, the gutter-shaped mirror M, etc. is provided in each of the above-mentioned lamps. This cooling air supply mechanism 8 consists of an air passage member 8 having an air blowing fan 82 disposed in the middle thereof.
1 and an air exhaust path member 83 with an air exhaust fan 84 provided in the middle thereof. The air passage member 81 has an outlet connected to the sides of the lamps 41 and 42 of the first lamp group 4 and a side of the lamps 51 and 52 of the second lamp group 5, and an inlet that is open to the outside. The exhaust passage member 83 has an entrance connected to the lamp 61 of the third lamp group 6,
62 and the top of the lamp 7, and the outlet is open to the outside. The tops of the lamps 41 and 42 of the first group 4 of lamps and the lamp 5 of the second group 5 of lamps
Connect the inlet of the air guide path member 9 to the top of 1, 52,
The outlet of this air guide path member 9 is connected to the hot air outlet member 2, and in the middle of the air guide path member 9, the cooling air becomes hot air by passing through the lamps 41, 42, 51, 52. An air guide fan 91 for sending the hot air to the hot air outlet member 2 and a heat dissipation box 92 made of a material with high thermal conductivity to lower the temperature of the hot air are provided, and the ultraviolet curing paint drying device is installed. Configure.

In devices with this configuration, the ultraviolet lamp UL
By turning on the lamps and operating the blower fan 82, cooling air is supplied from the outside through the air passage member 81 to the lamps 41, 4 of the first lamp group 4.
2 and into the lamps 51 and 52 of the second group 5 of lamps, and by activating the exhaust fan 84, the cooling is applied to the lamps 61 and 62 of the third group 6 of lamps from outside. Wind is sucked in and discharged to the outside via the exhaust passage member 83, and cooling air is sucked into the lamp 7 from outside and discharged to the outside via the exhaust passage member 83. On the other hand, by operating the wind guide fan 91, the lamps 41 and 42 of the first lamp group 4 and the lamps 51 and 5 of the second lamp group 5 are activated.
The cooling air sent to the cooling box 2 is heated by the heat from the ultraviolet lamp UL and becomes hot air.
The temperature is lowered to a predetermined temperature within the hot air outlet member 2, and the hot air is blown out from the hot air blowing hole 21 of the hot air outlet member 2. Then, by operating the exhaust fan 31, the hot air from the hot air outlet member 2 is sucked into the hot air suction member 3, and is discharged to the outside via the air exhaust path member 32. Therefore, the objects to be treated, the surfaces of which are coated with ultraviolet curable paint, are placed on the first belt portion P1 and the second belt portion P2 of the belt 12, thereby arranging them in two rows on the belt 12. By driving the belt 12, hot air from the hot air outlet member 2 is blown onto the paint on the surface of the object to be treated, thereby increasing the temperature of the paint, reducing its viscosity, and causing it to be contained in the paint. The volatile solvent is allowed to escape and then a UV lamp
The paint is cured by ultraviolet light from UL. Here, the lower surface of the object to be processed receives the ultraviolet rays from the ultraviolet lamps UL in the third group of lamps 6 and 7 located below the belt 12. Regarding the workpiece located on the belt portion P1, the upper and side surfaces thereof receive the ultraviolet rays from the ultraviolet lamps UL in the first group 4 of lamps, and the object is placed on the second belt portion P2 of the belt 12. The upper and side surfaces of the object to be processed will receive the ultraviolet rays from the ultraviolet lamps UL in the second group 5 of lamps. In this way, the paint on the surface of the object to be treated is dried.

The above-described device has the following effects.
In other words, the paint used is one that hardens when exposed to a predetermined amount of ultraviolet light, and the ultraviolet lamp UL used to irradiate the paint with ultraviolet light emits ultraviolet light with a light intensity that corresponds to the output. By irradiating the paint with ultraviolet rays for a short time using an ultraviolet lamp UL with an output of The length of the area required for drying is small, and the conveyance speed of the processed material can be increased.For example, it is faster to dry than conventional hot air drying equipment that uses hot air at 250℃. The required area length is 3/1
The material to be processed can be transported at a transport speed of 5x. The cooling air from the UV lamp UL is then turned into hot air by arousing the heat from the UV lamp UL.Using this hot air, the hot air is applied to the paint applied to the surface of the object to be treated.
Since the paint is sprayed before being irradiated with UL, the viscosity of the paint becomes smaller and the surface of the paint becomes smoother, resulting in a better finish on the object being treated, as well as eliminating volatile solvents contained in the paint. Since the heat is dissipated, there is no risk of the solvent vapor being ignited by a spark from the ultraviolet lamp UL, resulting in an explosion, and energy consumption can be reduced compared to using a separate dedicated hot air source. In this example, a first group 4 of lamps is provided to irradiate ultraviolet rays onto the workpiece on the first belt portion P1 divided on the belt 12, and Since the second group of lamps 5 is provided on the downstream side of the first group of lamps 4 in the conveyance path P in order to irradiate the workpiece on the belt portion P2 with ultraviolet rays, the ultraviolet lamps UL are It is possible to use an ultraviolet lamp UL which can be placed close to the object to be treated and therefore has a low output.
Regarding the third group of lamps 6 arranged below the belt 12, the lamps 61 and 62 are arranged below the belt 12.
Since the light fixtures 61 and 62 are disposed on both sides of the light fixtures 61 and 62, there is no risk that the insides of the lamps 61 and 62 will become dirty due to paint falling from the object to be treated. As for the lamp 7, since the paint on the surface of the object to be treated that has reached the upper part of the lamp has already dried, there is no risk of staining the inside of the lamp 7 due to falling paint.

In the present invention, (a) Cooling air may be guided to the hot air outlet member 2 by operating only the ventilation fan 82 and the ventilation fan 31 without providing the ventilation fan 91.

(b) Cooling box 92 provided in the air guide path member 9
An outside air intake is provided in the hot air outlet member 2, and the temperature of the hot air guided to the hot air outlet member 2 is set to a predetermined temperature, for example, 6 to ℃.
If the temperature is higher than that, the temperature range of the hot air may be lowered by taking in outside air.

C. A heater may be attached to the hot air outlet member 2, and when the temperature of the hot air is lower than the expected temperature, the temperature of the hot air may be raised by the heater.

(d) Instead of arranging the objects to be processed in two rows on the belt 12, they may be arranged in one row, and in this case, the second group of lamps 5 becomes unnecessary.

As described above, the present invention includes a transport mechanism that transports a workpiece whose surface is coated with an ultraviolet curable paint along a transport path, a hot air outlet member arranged to face the transport path, and a hot air outlet member arranged to face the transport path. A lamp disposed facing the conveyance path downstream of a hot air outlet member in the passage, an ultraviolet lamp provided thereon, a cooling air supply mechanism for sending cooling air into the lamp, and a cooling air supply mechanism through which the cooling air passes through the lamp. The method is characterized by comprising an air guiding path member that sends the hot air that has become hot air by doing so to the hot air outlet member, so that the length of the area required for drying is small; It is an object of the present invention to provide an ultraviolet curing paint drying device that can dry paint at a high conveyance speed, has no risk of explosion, can reduce power consumption, and provides a good finish. can.

[Brief explanation of the drawing]

FIG. 1 is an explanatory side view showing one embodiment of the present invention, and FIGS. 2 and 3 are explanatory longitudinal sectional front views each showing a part of one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Conveyance mechanism, 12... Belt, 2... Hot air outlet member, 3... Hot air suction member, 31... Exhaust fan, 4... Group of first lamps, 5... Second lamp Group of 6... Third group of lamps, 41, 42, 5
1, 52, 61, 62, 7... Lamp, UL... Ultraviolet lamp, M... Gutter mirror, 8... Cooling air supply mechanism, 81... Air duct member, 82... Ventilation fan, 83... ...Air exhaust path member, 84...Air exhaust fan, 9...Air guide path member, 91...Air guide fan,
92...Cooling box.

Claims (1)

[Scope of utility model registration request] a conveyance mechanism that conveys a workpiece whose surface is coated with an ultraviolet curable paint along a conveyance path; a hot air outlet member disposed to face the conveyance path;
A lamp disposed downstream of the hot air outlet member in the conveyance path and facing the conveyance path, an ultraviolet lamp provided thereon, a cooling air supply mechanism that sends cooling air into the lamp, and a cooling air supply mechanism that sends cooling air into the lamp; An ultraviolet curable paint drying device comprising: an air guiding path member that sends the hot air, which becomes hot air by passing through the hot air outlet member, to the hot air outlet member.