JPH04132940U - UV irradiation device - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of the present invention is to provide an ultraviolet irradiation device in which the amount of cold air inside the device is automatically adjusted during irradiation and non-irradiation. [Structure] In the ultraviolet irradiation device 1, the rotary shutter 3 rotates so that the opening faces downward during irradiation and upward during non-irradiation. Sometimes the ventilation hole 6a is opened,
A valve 7 is provided that closes the vent hole 6a during non-irradiation.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to an ultraviolet irradiation device for curing ultraviolet curing paint and the like.

0002

[Conventional technology]

For example, UV irradiation is used in the printing field, wood and plastic molding, etc. Inks and paints that harden when exposed to sunlight (UV inks, UV paints) are used. There is. There are various types of ultraviolet irradiation equipment for curing these inks and paints. For example, there is a type with a rotating shutter mechanism as shown in Figure 5. be. This ultraviolet irradiation device 20 has a rotary shutter mechanism 22 inside a box-shaped main body 21. is arranged, and this rotary shutter mechanism 22 is moved upward by a motor 22a during non-irradiation. It also rotates so that it faces downward during irradiation. 21a is exhaust air It is a cylinder. As shown in FIG. 6, the rotary shutter mechanism 22 illuminates ultraviolet rays arranged in its longitudinal direction. A straight tube-shaped lamp 23 that emits light, and a lamp that opens downward and is arranged to surround this lamp. A reflecting plate 25 having a portion 24 and a reflecting plate support 26 supporting this reflecting plate 25. Therefore, the rotary shutter mechanism 22 is configured so that the opening 24 is lowered as shown in FIG. 6 during irradiation. Ultraviolet rays are irradiated onto the object 31 to be irradiated, which is oriented and transported by the belt conveyor 30. When not irradiated, it rotates so that it faces upward as shown in Figure 7, and the ultraviolet rays illuminate downward. I'm trying not to get shot.

0003 The inside of the ultraviolet irradiation device becomes quite hot due to the heat of the lamp, so a rotating shutter mechanism is used. A side heat shield plate 27 for heat shielding is arranged around the 22, but Cooling air flows into the ultraviolet irradiation device from a blower (not shown) provided through the air intake port 28. Wind is supplied, and the cold air flows through the holes 25a of the reflector 25 and the holes 26a of the reflector support 26. The main body 21, side heat shield plate 27, reflector support 26, reflector 25, lamp 23 After circulating through each space, the air is sucked and discharged from the exhaust pipe 21a. The amount of cool air supplied is constant, and the amount varies depending on the UV irradiation during irradiation and non-irradiation. It is determined based on the temperature inside the irradiation device, but it is quite difficult to determine. For example, If the amount of cold air supplied is determined based on the time of irradiation, the lamp 23 will be Since the output is reduced to approximately 60%, the lamp may become too cold when not emitting light. The UV rays may become unstable and disappear, or the required amount of ultraviolet rays may not be irradiated even at the time of irradiation. Something happens that cannot happen. Also, if you decide the amount of cold air supplied based on the non-irradiation time, , the lamp did not cool down sufficiently during irradiation, and the temperature inside the device rose, causing thermal deformation in various parts of the device. occurs. Therefore, in the past, a fixed baffle plate, such as baffle plate 29, was placed inside the device to prevent interference. By adjusting the size and location of the magic plate, the temperature inside the device is at its maximum both during irradiation and non-irradiation. The amount of cold air to be supplied is determined so that it is within an acceptable but not ideal range. Ru.

0004

[Problem that the idea aims to solve]

However, the amount of cold air determined in this way is different due to the presence of baffles. Therefore, a large blower is required to supply cold air. This increases the cost and noise.

[0005] This invention automatically adjusts the amount of cold air inside the device during irradiation and non-irradiation. The purpose is to provide an external radiation irradiation device.

[0006]

[Means to solve the problem]

In order to achieve this purpose, the present invention includes a lamp that irradiates ultraviolet rays inside the main body. , a reflector plate arranged to cover the lamp and having an opening at the bottom and a ventilation hole at the top. , are placed on the outside of the reflector at a distance from the reflector to surround this reflector. It consists of a reflector support that is open at the bottom and has ventilation holes at the top like the reflector. A rotating shutter is installed, and the opening of this rotating shutter faces downward during irradiation. The ultraviolet rays rotate so that the aperture faces upward when not irradiated. In the irradiation device, the ventilation holes in the reflector support are opened during irradiation, and when not irradiated. Sometimes a valve was provided to close the vent. Further, a valve is provided on the reflector side of the reflector support, and this valve is provided near the ventilation hole. A plurality of upright stands extend toward the eclipsed reflector and engage with the stands. It is constructed to open and close using its own weight in accordance with the rotation of the rotating shutter. accomplished.

[0007]

[Effect]

In the invention of claim 1, the valve provided in the ventilation hole of the reflector support is closed during irradiation. The pores are opened and the ventilation holes are closed when not irradiated, so cold air flows during irradiation and when not irradiated. This will prevent the lamp from cooling down too much when it is not irradiating. In the invention of claim 2, the valve moves under its own weight according to the rotation of the rotary shutter, and the reflection plate Open and close the vents in the support.

[0008]

【Example】

In Figure 1, the main body 2 of the ultraviolet irradiation device 1 has a length of 20 cm, a width of 90 cm, and a height of It is a 25cm metal box shape, divided into an upper stage 2a and a lower stage 2b, and the lower stage 2b has a rotating system. Shutter 3 is placed. The rotary shutter 3 includes a straight tube type ultraviolet lamp 4, A metal tube open at the bottom placed along its length to cover the ultraviolet lamp. The projection plate 5 is open at the bottom like the reflector, and the light is reflected to the outside of the reflector so as to surround the reflector. It consists of a metal reflective plate support 6 placed a little distance from the plate. rotation The shutter 3 is rotatably supported by the main body 2 at both longitudinal ends thereof. The ultraviolet lamp 4 has an output of 6Kw, is a straight tube type with a length of about 60cm, and has a reflective The plate 5 has approximately the same length as the ultraviolet lamp, and has five ventilation holes in the upper center as shown in Figure 3. It has 5a. The reflector support 6 is slightly longer than the reflector 5 and has ventilation holes 5 at the top. There are two ventilation holes 6a at positions that do not overlap with the holes 6a.

[0009] Each vent hole 6 of the reflector support 6 is provided with a valve 7 (FIGS. 1 and 2). valve 7 are two metal studs extending from both ends of the ventilation hole 6 toward the reflector 5 as shown in Figure 4. It consists of a valve plate 7b made of metal and having a size that blocks the vent hole 6. The stand 7a passes through holes 7d bored at both ends of the valve plate 7b, and the tip of the stand 7a A stopper 7c is provided to prevent the valve plate 7b from coming off. Note that metal side heat shield plates 9 are arranged near both sides of the rotary shutter 3. There is. A ventilation opening 10 is provided on the side surface of the upper stage 2a of the main body 2 of the ultraviolet irradiation device 1. Ventilation holes 12 and 13 are provided in the top plate 11 at the boundary between 2a and the lower tier 2b. Up The upper part of the stage 2a is connected to an exhaust pipe 14.

0010 During irradiation, the opening of the rotary shutter 3 is at the bottom as shown in Figure 1, and the lamp The ultraviolet rays from 4 illuminate the object 17 to be irradiated, which is carried downward by a belt conveyor 16, etc. shot. The cold air flows into the ultraviolet irradiation device 1 from the intake port 10 and partly from the entrance/exit port 18 of the object to be irradiated. After cooling the inside of the ultraviolet irradiation device 1 by circulating as shown by the arrow, the exhaust pipe 14 The air is sucked and exhausted by an external blower (not shown). At this time, the valve plate 7 of the valve 7 b is lowered by its own weight and the ventilation hole 6a is open, so the inside of the reflector 5 and the reflector 5 are The cold air that has passed between the reflector support 6 passes through the ventilation holes 6a and is directed toward the upper stage 2a of the main body 2. go to. On the other hand, during non-irradiation, a motor (not shown) rotates the shutter as shown in Figure 2. -3 is rotated so that its opening is at the top. Therefore, the valve plate 7b of the valve 7 falls down due to its own weight and blocks the ventilation hole 6a, and cold air cannot pass through this ventilation hole 6a. Unable to do so, move in the direction of the arrow. Therefore, do not overcool a lamp whose output has decreased. There is no fault.

[0011] Most of the valves disposed in the vent hole 6a are those that open and close by their own weight like in the embodiment. Other types such as rotary solenoids may also be used. The size and shape of the main body, lamp, reflector and reflector support, as well as the number and position of ventilation holes. The location, size, etc. are not limited to those in the examples.

0012

[Effect of the idea] In the invention of claim 1, the valve provided in the ventilation hole of the reflector support is closed during irradiation. The pores are opened and the vents are closed when not irradiated, so cold air is generated during irradiation and when not irradiated. The flow changes and the lamp does not cool down too much when not irradiating. In the invention of claim 2, the valve moves to the reflector support by its own weight in accordance with the rotation of the rotary shutter. Since the ventilation hole is opened and closed, the structure is extremely simple and the operation is reliable.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the ultraviolet irradiation device of the present invention.

FIG. 2 is a cross-sectional view of a non-irradiation state with the rotating shutter facing upward.

FIG. 3 is a plan view of the rotating shutter.

FIG. 4 is a lateral view of the valve shown in FIG. 1;

FIG. 5 is a diagram showing an ultraviolet irradiation device with a rotating shutter mechanism.

FIG. 6 is a vertical cross-sectional view taken along line A-A in FIG. 5;

FIG. 7 is a cross-sectional view of the rotating shutter mechanism in a non-irradiation state with the mechanism facing upward.

[Explanation of symbols]

1 Ultraviolet irradiation device 2 Main body 2a Upper part of main unit 2b Lower part of main body 3 Rotating shutter 4 lamp 5 Reflector 5a Vent hole 6 Reflector support 6a Vent hole 7 Valve 7a stand 7b Valve plate

Claims (2)

[Scope of utility model registration request] Claim 1: A lamp 4 that irradiates ultraviolet light into the main body 2.
A reflector 5 is arranged to surround the lamp 4 and has an opening at the bottom and a ventilation hole 5a at the top, and a reflector 5 is placed on the outside of the reflector 5 at a distance from the reflector 5 so as to cover the reflector 5. A rotary shutter 3 is disposed, and includes a reflector support 6 that is open at the bottom and has a ventilation hole 6a at the top in the same way as the reflector 5, and the rotary shutter 3 has its opening facing downward during irradiation. In an ultraviolet irradiation device that rotates so that the opening faces upward during non-irradiation, a valve 7 is installed in the vent hole 6a of the reflector support 6 to open the vent hole 6a during irradiation and close the vent hole 6a during non-irradiation. An ultraviolet irradiation device characterized by being provided with. 2. A valve 7 is provided on the reflector 5 side of the reflector support 6, and the valve 7 is connected to a plurality of upright stands 7a extending toward the reflector 5 provided in the vicinity of the ventilation hole 6a. The ultraviolet irradiation device according to claim 1, comprising a valve plate 7b engaged with the stand 7a, and opened and closed by its own weight in accordance with the rotation of the rotary shutter 3.