JP6769027B2 - Ultraviolet irradiation device - Google Patents

Description

The present invention relates to an ultraviolet irradiation device provided with a shutter that blocks ultraviolet irradiation of the irradiated surface.

Conventionally, there is known an ultraviolet curing technique in which an ultraviolet curing agent or an ultraviolet curing paint adhered to an irradiated surface such as paper, a plastic film, or a metal plate is irradiated with ultraviolet rays by an ultraviolet irradiation device to cure the ultraviolet rays.
In the ultraviolet irradiation device, a shutter that can be opened and closed so that the ultraviolet irradiation to the irradiated surface can be blocked without turning off the ultraviolet lamp when adjusting the irradiation conditions or replenishing the object to be irradiated. (See, for example, Patent Document 1). In the ultraviolet irradiation device of Patent Document 1, the shutter can be opened and closed by moving two light-shielding plates extending along the extending direction of the ultraviolet lamp to the left and right in opposite directions to block the ultraviolet irradiation on the irradiation surface. I have to.

JP-A-6-198846

By the way, when the shutter is closed to block the irradiation of the irradiated surface with ultraviolet rays without turning off the ultraviolet lamp, the shutter is irradiated with ultraviolet rays. The shutter may be deformed due to the heat effect of irradiation with ultraviolet rays.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an ultraviolet irradiation device capable of avoiding a shutter malfunction due to deformation of a shutter member.

In order to achieve the above-mentioned object, the present invention is an ultraviolet irradiation device including an ultraviolet lamp and a shutter device that blocks the irradiation of the surface to be irradiated with ultraviolet rays from the ultraviolet lamp, and the shutter device. Provides a pair of shutter units that move and open and close in directions opposite to each other by driving a drive mechanism, and each of the pair of shutter units has a support bracket moved by the drive mechanism and the ultraviolet rays of the support bracket. comprising lamp and a plurality of light shielding plates which are arranged to overlap at a distance from each other in the irradiation direction of the light to the side of, and in a state in which the closed pair of the shutter unit, as opposed the support bracket abut against each other It is characterized in that the light-shielding plate of one shutter unit and the light-shielding plate of the other shutter unit are arranged so as to be alternately overlapped with each other with a gap in the light irradiation direction.

In the above configuration, the light-shielding plate may be formed of a thin plate member having excellent thermal conductivity.

In the above configuration, when the pair of shutter units are closed, the light-shielding plates of one shutter unit and the light-shielding plates of the other shutter unit are alternately overlapped with each other at intervals in the light irradiation direction. It may be a configuration arranged in.

In the above-described configuration, the light-shielding plate may be divided into a plurality of plate portions along the longitudinal direction of the ultraviolet lamp.

In the above-described configuration, the shutter unit may have a configuration in which a plurality of the plate portions are fastened to each other with play in the opening / closing direction.

In the above-described configuration, the shutter unit may be connected to a drive mechanism that moves the shutter unit in the opening / closing direction at both ends in the longitudinal direction of the light-shielding plate.

According to the present invention, an ultraviolet irradiation device including an ultraviolet lamp and a shutter device that blocks the irradiation of the irradiated surface with ultraviolet rays from the ultraviolet lamp, the shutter devices are oriented in directions facing each other. A pair of shutter units that move to open and close are provided, and each of the shutter units is provided with a plurality of light-shielding plates arranged so as to be spaced apart from each other in the light irradiation direction, so that some of the light-shielding plates are members. Even if the shutter is deformed, the light-shielding effect can be maintained by another light-shielding plate, and the shutter malfunction due to the deformation of the shutter member can be avoided.

It is sectional drawing which shows the ultraviolet irradiation apparatus which concerns on embodiment of this invention. It is sectional drawing which shows the ultraviolet irradiation apparatus in the state which the shutter apparatus is open. It is a top view which shows the shutter device, (A) is the figure which shows the state which the shutter device is closed, (B) is the figure which shows the state which the shutter device is open.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing an ultraviolet irradiation device 1 according to the present embodiment. FIG. 2 is a cross-sectional view showing an ultraviolet irradiation device 1 in a state where the shutter device 30 is open. 3A and 3B are top views showing a shutter device 30, FIG. 3A is a view showing a state in which the shutter device 30 is closed, and FIG. 3B is a view showing a state in which the shutter device 30 is open.

The ultraviolet irradiation device 1 includes an irradiation unit 10 having an ultraviolet lamp 11 and a shutter device 30 having a pair of shutter units 31A and 31B that open and close. The irradiation unit 10 and the shutter device 30 are housed in a box-shaped housing 5. The ultraviolet lamp 11 is a straight tube type lamp extending long in the housing 5. An irradiation opening 7 is provided on the lower surface 6 of the housing 5 along the longitudinal direction of the ultraviolet lamp 11. The ultraviolet irradiation device 1 is a device that irradiates ultraviolet rays from the irradiation opening 7 toward an irradiation object arranged below the housing 5. The irradiation opening 7 is formed in a substantially rectangular shape, and a front cover unit 8 that closes the irradiation opening 7 is attached to the lower surface 6 of the housing 5.
The direction substantially perpendicular to the longitudinal direction of the ultraviolet lamp 11 housed in the housing 5 is defined as the left-right direction or the lateral direction of the ultraviolet irradiation device 1 and will be described below.

The irradiation unit 10 includes an ultraviolet lamp 11 and a reflector 12 that surrounds the ultraviolet lamp 11. The reflector 12 has, for example, an elliptical cross section of the reflecting surface, and is configured to reflect the light of the ultraviolet lamp 11 arranged at the first focal point on the irradiated surface located at the second focal point. The ultraviolet lamp 11 and the reflector 12 are housed in the unit case 13. Although not shown, the ultraviolet lamp 11 has terminals electrically connected to both ends in the longitudinal direction. Both ends of the ultraviolet lamp 11 in the longitudinal direction are electrically connected to the power supply, and are supported by the housing 5 and the unit case 13 via support members. The reflector 12 extends in the longitudinal direction of the ultraviolet lamp 11. The reflector 12 may be divided into two parts on the left and right sides.

The front cover unit 8 can be inserted and removed between a pair of rails 8A provided on the lower surface 6 of the housing 5 along the longitudinal direction of the irradiation opening 7 on the left and right sides of the irradiation opening 7 and the pair of rails 8A and 8A. It is provided with a front cover 8B. Although not shown, the front cover 8B is composed of a cover glass formed of a transparent material such as quartz glass, and a frame surrounding the cover glass. In the front cover 8B, with the cover glass fitted in the frame body, the frame body is inserted between the pair of rails 8A and 8A from the end face in the longitudinal direction so as to close the irradiation opening 7 from the outside of the housing 5. , Attached to the housing 5. Although not shown, the ultraviolet irradiation device 1 may be configured to air-cool the ultraviolet lamp 11 and its surroundings by air sucked into the housing 5 using an appropriate device such as a suction fan. Good. The ultraviolet irradiation device 1 may be configured to suck air for air cooling from the irradiation opening 7, and in this case, dust and pride contained in the ambient air are sucked into the housing 5 together with the air. The filter for prevention may be provided in the front cover unit 8.

A shutter device 30 is provided between the irradiation unit 10 and the irradiation opening 7. The shutter device 30 includes a pair of shutter units 31A and 31B configured to block the irradiation of the irradiated surface of the ultraviolet lamp 11 with ultraviolet rays without turning off the ultraviolet lamp 11. The shutter units 31A and 31B are provided along the longitudinal direction of the ultraviolet lamp 11, and are configured to move in the direction opposite to each other in the left-right direction with respect to the center line L in the left-right direction of the ultraviolet irradiation device 1. When the shutter device 30 is closed (when the shutter device 30 is closed), the shutter units 31A and 31B are adjacent to each other at substantially the center in the lateral direction of the ultraviolet irradiation device 1 as shown in FIG. Arranged like this. The shutter device 30 blocks the irradiation of the irradiated surface of the ultraviolet lamp 11 with ultraviolet rays when the shutter device 30 is closed. When the shutter devices 30 are open (when the shutter device 30 is open), the shutter units 31A and 31B are located near the wall surfaces 6A and 6B at both ends of the housing 5 in the lateral direction, as shown in FIG. Each is placed. When the shutter device 30 is opened, the irradiated surface of the ultraviolet lamp 11 is irradiated with ultraviolet rays.

As shown in FIGS. 1 and 2, each of the shutter units 31A and 31B includes a plurality of (two in the present embodiment) light-shielding plates 32 arranged so as to be overlapped with each other in the light irradiation direction of the ultraviolet lamp 11. .. The light-shielding plate 32 is formed of a thin plate member that is lightweight and has excellent thermal conductivity, such as a nickel-plated iron alloy. According to this configuration, the weight of the shutter device 30 can be reduced, and the heat generated when the light shielding plate 32 is irradiated with the light of the ultraviolet lamp 11 can be efficiently dissipated. The light-shielding plate 32 is arranged on the support bracket 34 by using the spacer 33 so as to be overlapped with each other at intervals in the light irradiation direction of the ultraviolet lamp 11.

The support bracket 34 is formed of a member having a higher rigidity than the light-shielding plate 32, and is formed to have a length dimension extending in the length direction of the light-shielding plate 32. Further, in the support bracket 34, when the shutter device 30 is closed, the support bracket 34 of one shutter unit 31A and the support bracket 34 of the other shutter unit 31B are on the center line L in the left-right direction of the ultraviolet irradiation device 1. It is configured to hit each other. On the other hand, in the light-shielding plate 32, when one shutter unit 31A and the other end 32X facing each other of the shutter unit 31B are closed, the center line L in the left-right direction of the ultraviolet irradiation device 1 It is configured to extend farther than. Further, as shown in FIG. 1, the light-shielding plate 32 (32A) of one shutter unit 31A and the light-shielding plate 32 (32B) of the other shutter unit 31B are in the light irradiation direction when the shutter device 30 is closed. They are arranged so as to be alternately overlapped with each other at intervals.

When the shutter device 30 is closed, the amount of overlap between the light-shielding plate 32A and the light-shielding plate 32B (the length of the portion overlapping in the light irradiation direction in the left-right direction) is such that when the shutter device 30 is opened, the light-shielding plate 32A, The amount of 32B can be set appropriately as long as it does not interfere with the irradiation of the irradiated surface of the ultraviolet lamp 11 with ultraviolet rays. In the present embodiment, the amount of overlap between the light-shielding plate 32A and the light-shielding plate 32B when the shutter device 30 is closed is set to about 5 mm. Further, the distance between the light shielding plates 32 of the shutter units 31A and 31B in the light irradiation direction may be an appropriate distance according to the height dimension in which the shutter device 30 can be arranged in the ultraviolet irradiation device 1. it can. In the present embodiment, the height dimension of the shutter device 30 is 40 mm to 50 mm, whereas the distance between the light shielding plates 32 of the shutter units 31A and 31B in the light irradiation direction is set to about 8 to 10 mm. There is. That is, when the shutter device 30 is closed, the light-shielding plate 32A of one shutter unit 31A and the light-shielding plate 32B of the other shutter unit 31B are arranged so as to alternately overlap each other with a distance of 4 to 5 mm. ..

The distance between the light-shielding plates 32 in the light irradiation direction is adjusted by the height of the spacer 33 interposed between the light-shielding plates 32 or between the light-shielding plates 32 and the support bracket 34. A plurality of spacers 33 are provided along the longitudinal direction of the light-shielding plate 32, and at least two or more spacers 33 are provided side by side in the lateral direction at appropriate positions in the longitudinal direction. The spacer 33 is fastened to the support bracket 34 together with the light-shielding plate 32 by a screw 37 described later. According to this configuration, at least two or more spacers 33 are provided side by side in the lateral direction at appropriate positions in the longitudinal direction, so that it is possible to prevent the light-shielding plate 32 from being displaced in the height direction. Then, even when the light-shielding plate 32 interferes with another light-shielding plate 32, the light-shielding plate 32 does not tilt diagonally, and the light-shielding plate 32 can be stably held substantially parallel to the support bracket 34.

When the shutter device 30 is closed, the light-shielding plate 32 is irradiated with the ultraviolet rays of the ultraviolet lamp 11, and the ultraviolet rays applied to the light-shielding plate 32 may cause a thermal effect. Since the light-shielding plate 32 of the present embodiment is formed of a thin plate member having excellent thermal conductivity, the heat generated by the ultraviolet irradiation of the ultraviolet lamp 11 can be efficiently dissipated. Further, since the shutter device 30 of the present embodiment has a configuration in which a plurality of light-shielding plates 32 are arranged so as to be stacked in the light irradiation direction, some of the light-shielding plates 32 are deformed by the heat effect of the ultraviolet irradiation of the ultraviolet lamp 11. Even if it occurs, the light-shielding effect of the other light-shielding plate 32 can be maintained. Further, in the present embodiment, the light-shielding plate 32A of one shutter unit 31A and the light-shielding plate 32B of the other shutter unit 31B alternate with each other at intervals in the light irradiation direction when the shutter device 30 is closed. They are arranged so that they overlap. With this configuration, even if the ultraviolet rays of the ultraviolet lamp 11 leak from between the shutter units 31A and 31B, reflection and refraction are repeated between the light-shielding plates 32, and the ultraviolet illuminance drops. Therefore, it is possible to efficiently block the ultraviolet rays of the ultraviolet lamp 11 from being irradiated to the irradiated surface.

As shown in FIG. 3, the shutter units 31A and 31B are connected to a drive mechanism 50 that moves the shutter units 31A and 31B in the left-right direction at both ends in the longitudinal direction. Since the shutter device 30 is configured symmetrically in the front-rear direction in the longitudinal direction, only the front half or the rear half in the longitudinal direction of the shutter device 30 is shown in FIG.
The drive mechanism 50 includes power cylinders 51A and 51B in which the support brackets 34 of the shutter units 31A and 31B are connected to each other via connecting members 35 connected to both ends of the support brackets 34 in the longitudinal direction. The shutter units 31A and 31B are configured to slide and move in parallel directions facing each other to the left and right by the expansion and contraction movement of the power cylinders 51A and 51B.

The light-shielding plate 32 is divided into plate portions 36 having substantially equal lengths, and a plurality of the plate portions 36 are arranged along the longitudinal direction of the ultraviolet lamp 11. Although not shown, the amount of deformation is determined between the adjacent plate portions 36 when the light-shielding plate 32 is deformed, such as distortion in the length direction, due to the heat effect of the ultraviolet irradiation of the ultraviolet lamp 11. There is an acceptable gap. According to this configuration, even when the light-shielding plate 32 is distorted in the length direction due to the influence of heat, the distortion in the length direction of the light-shielding plate 32 can be tolerated. It should be noted that the light-shielding plates 32 may be arranged so as to be overlapped with each other in the light irradiation direction so that the gaps are arranged so as not to overlap with the irradiation direction.

The plate portion 36 is provided with screw holes 38 through which the screws 37 are inserted at the front and rear end portions along the longitudinal direction and the substantially central portion, and is fastened to the support bracket 34 using the screws 37. The screw hole 38 is formed in an elliptical shape extending in the opening / closing direction of the shutter device 30, and the substantially center of the ellipse is formed at an appropriate fastening position. If the plate portion 36 is distorted and interferes with other plate portions 36 when the shutter device 30 is closed, the screw 37 escapes within the so-called "play" of the elliptical screw hole 38. Therefore, the plate portion 36 is configured so as not to interfere with other plate portions 36 and cause malfunctions such as the shutter device 30 not closing.

By the way, as shown in FIG. 2, in the configuration in which the shutter units 31A and 31B are slid and moved in the directions facing each other to the left and right, as compared with the case where the shutter unit is rotated and retracted to both sides or above the ultraviolet lamp 11, for example. Therefore, there is an advantage that the shutter storage space can be reduced particularly in the height direction. As a result, the ultraviolet irradiation device 1 can be miniaturized. Further, since the structure for opening and closing the shutter units 31A and 31B can be realized with a simple configuration without complicating the structure, malfunction is unlikely to occur and maintenance seems to be performed. However, in the configuration in which the shutter units 31A and 31B are slid to the left and right in the directions facing each other, a sufficient evacuation space for the light shielding plate 32 cannot be secured, and even when the shutter device 30 is opened, it may be affected by heat due to ultraviolet irradiation. There is sex. According to the present embodiment, since a plurality of light-shielding plates 32 are arranged so as to be stacked at intervals from each other, the light-shielding effect can be maintained even if some of the light-shielding plates 32 are deformed due to the influence of heat. it can. Further, since each light-shielding plate 32 is formed into a thin plate shape from a member having excellent thermal conductivity, it is possible to reduce the influence of heat, and even if the shutter device 30 is irradiated with ultraviolet rays when it is closed and when it is opened, the shutter device It is possible to avoid the malfunction of 30.

As described above, according to the present embodiment, the ultraviolet irradiation device 1 includes an ultraviolet lamp 11 and a shutter device 30 that blocks the irradiation of the irradiated surface with ultraviolet rays from the ultraviolet lamp 11. The shutter device 30 includes a pair of shutter units 31A and 31B that move to open and close in directions facing each other, and the shutter units 31A and 31B are arranged so as to be overlapped with each other at intervals in the light irradiation direction. A plurality of light-shielding plates 32 were provided.
With this configuration, even if some of the light-shielding plates 32 are deformed due to the heat effect of the ultraviolet irradiation of the ultraviolet lamp 11, the other light-shielding plates 32 can maintain the light-shielding effect, and the members of the shutter units 31A and 31B. It is possible to avoid shutter malfunction due to deformation.

Further, according to the present embodiment, since the light-shielding plate 32 is formed of a thin plate member having excellent thermal conductivity, the heat generated by the ultraviolet irradiation of the ultraviolet lamp 11 can be efficiently dissipated, and the heat effect of the ultraviolet irradiation can be affected. It can be reduced.

Further, according to the present embodiment, when the pair of shutter units 31A and 31B are closed, the light-shielding plate 32 is a light-shielding plate 32 of one shutter unit 31A (31B) and the other shutter unit 31B (31A). The light-shielding plates 32 and the light-shielding plates 32 were arranged so as to be alternately overlapped with each other at intervals in the light irradiation direction. According to this configuration, even if some of the light-shielding plates 32 are deformed due to the heat effect of the ultraviolet irradiation of the ultraviolet lamp 11, the other light-shielding plates 32 can maintain the light-shielding effect, and the shutter units 31A and 31B It is possible to avoid a shutter malfunction due to deformation of the member. Further, even if the ultraviolet rays of the ultraviolet lamp 11 leak from between the shutter units 31A and 31B, the ultraviolet illuminance is reduced by repeating reflection and refraction between the light shielding plates 32 which are alternately overlapped. Therefore, when the shutter device 30 is closed, it is possible to efficiently block the ultraviolet rays of the ultraviolet lamp 11 from being irradiated to the irradiated surface.

Further, according to the present embodiment, since the light-shielding plate 32 is divided into a plurality of plate portions 36 along the longitudinal direction of the ultraviolet lamp 11, it is possible to reduce the deformation of the light-shielding plate 32 in the length direction due to the influence of heat. it can.

Further, according to the present embodiment, in the shutter units 31A and 31B, a plurality of plate portions 36 arranged so as to be overlapped in the irradiation direction are fastened to each other with play in the opening / closing direction. According to this configuration, even if the plate portion 36 is distorted due to the influence of heat and interferes with the plate portion 36 facing the plate portion 36 when the shutter device 30 is closed, it can escape within the range of play in the opening / closing direction. As a result, it is possible to prevent the plate portion 36 from interfering with another plate portion 36 facing the plate portion 36 and causing a malfunction such as the shutter device 30 not closing.

Further, according to the present embodiment, the shutter units 31A and 31B are configured to be connected to a drive mechanism 50 that moves the shutter units 31A and 31B in the opening / closing direction at both ends in the longitudinal direction of the light shielding plate 32. According to this configuration, since the drive mechanism 50 for opening and closing the shutter units 31A and 31B can be provided at the end of the ultraviolet irradiation device 1 in the longitudinal direction, the width and height of the ultraviolet irradiation device 1 can be reduced. Can be transformed into.

It should be noted that the above-described embodiment is an aspect of the present invention, and of course, it can be appropriately changed without departing from the spirit of the present invention.
Further, the present invention is not limited to the ultraviolet irradiation device, and includes a shutter that can be opened and closed so that the irradiation of light to the irradiated surface can be blocked without turning off the light of the light source. It is applicable to the irradiation device.

1 Ultraviolet irradiation device 7 Irradiation aperture 10 Irradiation unit 11 Ultraviolet lamp 30 Shutter device 31A, 31B Shutter unit 32, 32A, 32B Shading plate 36 Plate part 50 Drive mechanism

Claims (5)

An ultraviolet irradiation device including an ultraviolet lamp and a shutter device that blocks the irradiation of the irradiated surface with ultraviolet rays from the ultraviolet lamp.
The shutter device includes a pair of shutter units that move in opposite directions to open and close by driving a drive mechanism .
Each of the pair of shutter units has a support bracket moved by the drive mechanism and a plurality of light-shielding plates arranged on the side of the support bracket on the side of the ultraviolet lamp at intervals in the light irradiation direction. And with
With the pair of shutter units closed,
The support brackets facing each other are configured to abut each other.
The light-shielding plate of one shutter unit and the light-shielding plate of the other shutter unit are arranged so as to be alternately overlapped with each other with a gap in the light irradiation direction.
An ultraviolet irradiation device characterized by this. The ultraviolet irradiation device according to claim 1, wherein the light-shielding plate is formed of a thin plate member having excellent thermal conductivity. The ultraviolet irradiation device according to claim 1 or 2, wherein the light-shielding plate is divided into a plurality of plate portions along the longitudinal direction of the ultraviolet lamp. The ultraviolet irradiation device according to claim 3, wherein the shutter unit has a plurality of plate portions that are fastened to each other with play in the opening / closing direction. The ultraviolet irradiation device according to any one of claims 1 to 4, wherein the shutter unit is connected to a drive mechanism for moving the shutter unit in the opening / closing direction at both ends in the longitudinal direction of the light-shielding plate.

Images