JP6742838B2 - Ultraviolet irradiation device and ultraviolet flaw detection device - Google Patents

Description

The present invention relates to an ultraviolet irradiation device for irradiating ultraviolet rays, and an ultraviolet flaw detection device for irradiating the surface of an object to be inspected with ultraviolet rays to analyze the surface state of the object to be inspected. The present invention relates to an ultraviolet irradiation device used for exciting a fluorescent substance such as penetrant flaw detection.

BACKGROUND ART As a flaw detection inspection of a surface of an object to be inspected such as a steel material, a magnetic particle flaw detection test and a penetration flaw detection test, which are types of nondestructive inspection methods, are known. In the magnetic particle flaw detection test, magnetic powder or a magnetic powder solution containing magnetic powder is applied to the surface of the inspection object, and the inspection object is magnetized by applying a magnetic field to the inspection object. Since magnetic flux concentrates on defects such as cracks on the surface of the object to be inspected, magnetic powder is attracted to this magnetic flux to form an instruction pattern by the magnetic powder. Then, the defect is inspected by observing the magnetic powder pointing pattern. In the magnetic particle flaw detection test, there is a fluorescent magnetic particle flaw detection test using fluorescent magnetic powder in which a fluorescent substance is applied to magnetic powder in order to improve the detection accuracy of defects.

On the other hand, in the penetrant flaw detection test, first, the penetrant is applied to the surface of the object to be inspected, and the penetrant is infiltrated into defects such as cracks on the surface. Next, the excess penetrant liquid adhering to the surface is removed, the developer powder is applied to the surface, and the penetrant liquid penetrating into the defect is sucked to the surface by the capillary phenomenon. Then, the defect is inspected by observing the permeation instruction pattern by the permeated liquid sucked up. The penetrant flaw detection test includes a fluorescent magnetic particle flaw test using a fluorescent penetrant containing a phosphor in order to improve the accuracy of defect detection.

When the fluorescent magnetic powder or the fluorescent penetrant is used in the magnetic particle flaw detection test or the penetrant flaw test, it is necessary to irradiate the inspection object with ultraviolet rays to excite the fluorescent magnetic powder or the fluorescent substance of the fluorescent penetrant. As an ultraviolet irradiation device that irradiates ultraviolet rays, a device using an ultraviolet LED (Light Emitting Diode) as a light source is known.

Patent Document 1 discloses an ultraviolet flaw detection lamp that illuminates an object to be inspected for a penetrant flaw detection test or a magnetic particle flaw detection test with ultraviolet light, and is an area narrower than a size of a minimum illumination area to illuminate the object to be inspected. A plurality of ultraviolet light emitting diodes arranged in a ring with the optical axis of the emitted light aligned in one direction, and on each optical axis of the ultraviolet light emitted from each of the ultraviolet light emitting diodes with a predetermined spread angle. A plurality of condenser lenses for separately collecting the ultraviolet rays emitted from the respective ultraviolet light emitting diodes and irradiating the body to be inspected, and a lens supporting body integrally supporting these condenser lenses, While the plurality of condenser lenses are positioned on the optical axis of the ultraviolet light emitted from the ultraviolet light emitting diodes respectively, the lens support is moved back and forth in the optical axis direction of the ultraviolet light, and There is disclosed an ultraviolet flaw detection lamp that includes a lens advancing/retreating mechanism that changes the size of an irradiation area, and that superimposes the ultraviolet light collected by the condensing lens on each other and irradiates the object to be inspected.

JP, 2011-215077, A

According to the configuration of Patent Document 1, the illuminance of ultraviolet light that illuminates the flaw detection target can be easily increased.

Here, the ultraviolet LED heats up when it emits light, but due to this heat generation, recombination of electrons and holes that do not contribute to light emission increases, the amount of light decreases, and the intensity of ultraviolet light irradiated decreases. If it exceeds, it will break down. Therefore, in order to maintain a high ultraviolet intensity, it is important to take measures to maintain the temperature rise of the ultraviolet LED below a predetermined temperature. However, in Patent Document 1, no consideration is given to cooling of the ultraviolet LED.

As a simple cooling method for the ultraviolet LED, there is air cooling in which air is forcibly sent to the ultraviolet LED by a fan or the like and heat of the ultraviolet LED is radiated by heat exchange with the air.

Here, when the object to be inspected is a steel material or the like, surface treatment such as shot blasting is often performed as a pre-process of the flaw detection inspection in order to remove the oxide film, scale and the like adhering to the surface of the object to be inspected. Therefore, when such a surface treatment is performed, a large amount of particles such as scales, which are the removed oxide film, are easily floated as dust in the air used for the flaw detection inspection. When air-cooling is performed using a fan in an environment in which a lot of dust is suspended in the air, a large amount of outside air is taken into the ultraviolet irradiation device, so a lot of dust is sucked into the ultraviolet irradiation device together with this outside air. Will be done. If a large amount of dust is sucked into the ultraviolet irradiation device, the ultraviolet irradiation device may malfunction or the cooling efficiency may be deteriorated. Therefore, it is necessary to prevent the dust from being sucked by a filter or the like. However, in such air cooling using a fan and a filter, it is necessary to periodically perform maintenance such as cleaning and replacement of the fan and the filter in order to maintain the cooling effect. Further, since the flaw detection inspection is interrupted during maintenance, running costs tend to increase, and there is room for improvement in these points.

Therefore, an object of the present invention is to provide an ultraviolet irradiation device and an ultraviolet flaw detection device that have good maintainability and can reduce running costs.

In order to solve the above problems, the ultraviolet irradiation device of the present invention,
A topped tubular housing having a tubular peripheral wall extending in the vertical direction and an upper wall closing the upper end of the peripheral wall;
An ultraviolet LED unit having an ultraviolet LED and a heat sink,
A cover for closing the lower end of the peripheral wall,
In the ultraviolet LED unit, the heat sink is housed in the housing so as to face the upper wall,
The housing has an intake port that penetrates the peripheral wall and communicates with the inside, and opens downward by a louver, and a cylindrical exhaust duct that extends upward from the upper wall and communicates with the inside. ,
The cover has an ultraviolet light transmitting portion that transmits the ultraviolet light emitted by the ultraviolet LED,
Further, an exhaust port cover for covering the upper end of the exhaust duct from above with a predetermined interval is provided.

Furthermore, the cover is provided with a hinge that swingably connects the cover to the peripheral wall between a closed state in which the lower end of the peripheral wall is closed and a released state in which the lower end of the peripheral wall is open.

Further, an adjusting mechanism for adjusting a distance between the upper end of the exhaust duct and the exhaust port cover is provided.

Further, a power supply unit capable of adjusting the intensity of the ultraviolet light emitted by the ultraviolet LED is housed in the housing.

Further, the ultraviolet flaw detector of the present invention is characterized by including the above-mentioned ultraviolet irradiation device.

According to the present invention, a UV-LED unit including a UV-LED and a heat sink, and a cylindrical housing having a cylindrical peripheral wall that extends in the vertical direction and an upper wall that closes the upper end of the peripheral wall, A cover closing a lower end of a peripheral wall, the ultraviolet LED unit is housed in the housing with the heat sink facing the upper wall, and the housing penetrates the peripheral wall to communicate with the inside. The louver has an intake port that opens downward, and a cylindrical exhaust duct that extends upward from the upper wall and communicates with the inside. The cover transmits the ultraviolet light emitted by the ultraviolet LED. Provided is an ultraviolet irradiation device which has an ultraviolet ray transmitting portion and which further has an exhaust port cover which covers the upper end of the exhaust duct from above with a predetermined interval, so that the maintainability is good and the running cost can be reduced. be able to.

Further, since the cover is provided with a hinge for swingably connecting to the peripheral wall between a closed state in which the lower end of the peripheral wall is closed and a released state in which the lower end of the peripheral wall is opened, the cover is housed inside the housing. Maintenance such as replacement of the UV LED unit is easy and convenient.

Further, since the adjusting mechanism for adjusting the distance between the upper end of the exhaust duct and the exhaust port cover is provided, the flow velocity of the air taken into the housing can be adjusted, and the ultraviolet LED can be cooled according to the use environment. It is possible and easy to use.

Further, since the power supply unit capable of adjusting the intensity of the ultraviolet light emitted by the ultraviolet LED is housed in the housing, it is possible to reduce the size of the power supply unit and not to be restricted by the use environment, and the intensity of the ultraviolet light can be adjusted. Easy to use.

Furthermore, since the ultraviolet flaw detection device of the present invention includes the above-described ultraviolet irradiation device, it is possible to provide an ultraviolet flaw detection device that has good maintainability and can reduce running costs.

It is the front view which showed an example of the ultraviolet irradiation device concerning this embodiment. It is a top view of the ultraviolet irradiation device of FIG. It is a bottom view of the ultraviolet irradiation device of FIG. It is a rear view of the ultraviolet irradiation device of FIG. It is a left side view of the ultraviolet irradiation device of FIG. FIG. 4 is a cross-sectional view taken along line VI-VI of FIG. 3 showing the internal structure of the ultraviolet irradiation device of FIG. 1. FIG. 4 is a sectional view taken along line VII-VII of FIG. 3 showing the internal structure of the ultraviolet irradiation device of FIG. 1. It is an enlarged view of the ultraviolet LED unit of FIG. FIG. 3 is a left side view showing an example of a state where the cover of the ultraviolet irradiation device of FIG. 1 is open. 1 is a schematic diagram showing the configuration of a fluorescent magnetic particle flaw detector as an example of an ultraviolet flaw detector according to the present embodiment. It is a block diagram of a control system of a fluorescent magnetic particle flaw detector.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a front view showing an example of the ultraviolet irradiation device 1 according to the present embodiment, FIG. 2 is a plan view of the ultraviolet irradiation device 1 of FIG. 1, and FIG. 3 is a plan view of the ultraviolet irradiation device 1 of FIG. 4 is a bottom view, FIG. 4 is a rear view of the ultraviolet irradiation device 1 of FIG. 1, FIG. 5 is a left side view of the ultraviolet irradiation device 1 of FIG. 1, and FIG. 6 is an inside of the ultraviolet irradiation device 1 of FIG. 5 is a sectional view taken along line VI-VI of FIG. 3 showing a structure, FIG. 7 is a sectional view taken along line VII-VII of FIG. 3 showing an internal structure of the ultraviolet irradiation device 1 of FIG. 1, and FIG. It is an enlarged view of the ultraviolet LED unit 12 of No. 6. In the following, for convenience of description, in FIG. 1, the side of the fixed arm 23 described below is the top, the side of the cover 11 described below is the bottom, the front side is the front with respect to the paper surface, and the back side is the rear, The right side is the right and the left side is the left. A VI-VI line in FIG. 3 is a straight line that extends in the left-right direction through the center of the ultraviolet LED unit 12 located in the center, and FIG. 6 is a vertical cross-sectional view of the ultraviolet irradiation device 1. A VII-VII line in FIG. 3 is a straight line that passes through the center of the ultraviolet LED unit 12 located in the center and extends in the front-rear direction, and FIG. 7 is a vertical cross-sectional view of the ultraviolet irradiation device 1. 6 and 7, parts other than the power supply unit 44 and the support frame 48 described later are shown in cross section. Further, in FIGS. 6 and 7, the direction of air flow is indicated by a two-dot chain line arrow.

As shown in FIGS. 1 to 8, the ultraviolet irradiation device 1 includes a housing 10, a cover 11, and five ultraviolet LED units 12 housed inside the housing 10. The ultraviolet irradiation device 1 is configured to irradiate the ultraviolet light emitted from the ultraviolet LED unit 12 downward through the cover 11.

The housing 10 has a rectangular cylindrical peripheral wall 14 formed in a top-end cylindrical shape and formed of four side walls 13 and extending in the vertical direction, and an upper wall 15 closing an upper end of the peripheral wall 14. The housing 10 has a plurality of intake ports 16 on the four side walls 13 of the peripheral wall 14. The intake port 16 penetrates the peripheral wall 14 and communicates with the inside of the housing 10, and is opened downward by a louver 17. The louver 17 is a blade that projects outward from the outer surface of the peripheral wall 14, and is inclined downward toward the outside. Therefore, the intake port 16 does not open upward and sideways.

Further, the housing 10 has two cylindrical exhaust ducts 18 extending upward from the upper wall 15 and communicating with the inside. Flat plate-shaped exhaust port covers 19 are arranged above the upper ends of the exhaust ducts 18, respectively. The exhaust port cover 19 has a substantially quadrangular shape in a plan view, and is supported by two support bars 20 extending upward from the upper wall 15. Further, the exhaust port cover 19 has a protruding portion 19a protruding downward at the outer peripheral edge portion. The exhaust port cover 19 covers the upper end of the exhaust duct 18 from above with a predetermined distance D. Therefore, the upper end of the exhaust duct 18 is not exposed upward. Further, as will be described later in detail, the gap between the upper end of the exhaust duct 18 and the lower surface of the exhaust port cover 19 serves as an exhaust port 21 through which the air inside the housing 10 is exhausted.

The support rod 20 includes a spacer 22 as an adjusting mechanism that adjusts the distance D between the upper end of the exhaust duct 18 and the lower surface of the exhaust port cover 19. The spacer 22 is detachably arranged between the upper end of the support rod 20 and the exhaust port cover 19. The distance D can be adjusted depending on the presence/absence of the spacer 22 and the size of the spacer 22, so that the size of the exhaust port 21 can be adjusted.

A fixed arm 23 formed by bending a plate-shaped member in a gate shape in a front view is attached to the housing 10. The fixed arm 23 has one end fixed to the right side wall 13 of the peripheral wall 14 with a bolt and the other end fixed to the left side wall 13 with a bolt. The fixed arm 23 is used to suspend and fix the ultraviolet irradiation device 1 at a desired position, and has two through holes 24 used for bolt fastening. The fixed arm 23 may have any structure as long as it can fix the ultraviolet irradiation device 1 at a desired position, and its structure is not particularly limited. However, by configuring the fixed arm 23 as described above, the fixed arm 23 can be gripped and the ultraviolet irradiation device 1 can be moved, which is convenient.

The housing 10, the exhaust port cover 19, the fixed arm 23, and the like are formed of a material having high thermal conductivity such as aluminum, but the material of each member is not particularly limited. It should be noted that the housing 10 may be a top-end cylindrical shape having a cylindrical peripheral wall 14 extending in the vertical direction and an upper wall 15 closing the upper end of the peripheral wall 14, and for example, the peripheral wall 14 is formed in a cylindrical shape. The top may be cylindrical. Further, in the housing 10, the peripheral wall 14, the upper wall 15, the exhaust duct 18, and the like may be configured by separate members. Further, the exhaust duct 18 may have any configuration as long as it extends upward from the upper wall 15, and the shape, number, etc. are not particularly limited. For example, the exhaust duct 18 may have a rectangular tubular shape. Further, the exhaust port cover 19 may have a configuration in which the upper end of the exhaust duct 18 is covered from above with a predetermined spacing D, and may be circular in plan view, for example, and does not include the protrusion 19a. It may be configured.

The adjusting mechanism is not particularly limited as long as it can adjust the distance D between the upper end of the exhaust duct 18 and the lower surface of the exhaust port cover 19. For example, the adjustment mechanism may have a configuration in which the support bar 20 is expandable and contractible, for example, a form having a telescopic pipe structure, or may be a form in which it is expanded and contracted by the force of a spring. The support rod 20 may be attached to the exhaust duct 18 or may not be provided with the spacer 22.

The cover 11 has an ultraviolet ray transmitting portion 25, a frame 26, a locking plate 27, etc., and closes the lower end of the peripheral wall 14. The ultraviolet ray transmitting portion 25 is a plate-shaped member having a substantially quadrangular shape when viewed from the bottom, and is formed of a material having excellent ultraviolet ray transmittance such as quartz glass. The frame body 26 is a plate-shaped member that extends along the entire circumference of the ultraviolet light transmitting portion 25 and has a substantially rectangular ring shape in a bottom view. The ultraviolet ray transmitting portion 25 is attached to the frame body 26 such that the outer peripheral edge portion is sandwiched between the inner peripheral edge portion of the frame body 26 and the locking plate 27. The upper surface of the frame 26 is in close contact with a flange 28 provided at the lower end of the peripheral wall 14. Further, the frame body 26 has a protrusion 26a protruding upward on the outer peripheral edge portion other than the rear side. The lower ends of the peripheral wall 14 other than the rear side, that is, the lower ends of the front, right, and left side walls 13 are covered from the outside by the protrusions 26a. As a material of the frame 26 and the locking plate 27, aluminum or the like having high heat conductivity can be exemplified, but it is not particularly limited. Then, the ultraviolet rays emitted from the ultraviolet LED unit 12 housed inside the housing 10 pass through the ultraviolet ray transmitting portion 25 of the cover 11 and are emitted downward.

The cover 11 is connected to the peripheral wall 14 via a hinge 29. More specifically, one end of the hinge 29 is attached to the frame 26 of the cover 11, and the other end of the hinge 29 is attached to the side wall 13 behind the peripheral wall 14. As shown in FIG. 9, the cover 11 is swingable between the closed state in which the lower end of the peripheral wall 14 is closed by the hinge 29 and the released state in which the lower end of the peripheral wall 14 is released. is there. Here, FIG. 9 is a left side view showing an example of a state where the cover 11 of the ultraviolet irradiation device 1 of FIG. 1 is opened. The cover 11 includes a lock pin 30 as a lock mechanism that locks the cover 11 to the peripheral wall 14 so as to maintain the closed state in which the lower end of the peripheral wall 14 is closed. The lock pin 30 is a rod-shaped member having a screw that engages with a nut (not shown) provided on the flange 28 at the lower end of the peripheral wall 14, and locks the cover 11 to the peripheral wall 14 by screw fastening. It should be noted that the lock mechanism only needs to have a configuration in which the cover 11 is locked to the peripheral wall 14 so as to maintain the closed state, and may be a clasp such as a patch lock.

The cover 11 may be configured to close the lower end of the peripheral wall 14 and transmit the ultraviolet light emitted from the ultraviolet LED unit 12. For example, the cover 11 may be composed of only the ultraviolet ray transmitting portion 25 formed of a material having excellent ultraviolet ray transmitting property such as quartz glass. In addition, the cover 11 may be configured to include the ultraviolet ray transmitting portions 25 for the five ultraviolet ray LED units 12, respectively. Further, the cover 11 may not have the protrusion 26a. Further, the cover 11 may be attached to the peripheral wall 14 by screw fastening, or may be fixed to the peripheral wall 14. However, from the viewpoint of maintainability, a configuration in which the lower end of the peripheral wall 14 can be released and is in a released state is preferable.

Five ultraviolet LED units 12 are housed inside the housing 10. The ultraviolet LED unit 12 includes an ultraviolet light emitting section 31, a heat sink 32, a mounting plate 33 and the like. The ultraviolet LED unit 12 is housed inside the housing 10 with the heat sink 32 facing the upper wall 15 and the ultraviolet light emitting unit 31 facing the cover 11. The ultraviolet LED unit 12 is arranged so as to be located at the center and four corners of the housing 10 in a bottom view, and is detachably attached to the partition plate 34 provided inside the housing 10.

The ultraviolet light emitting unit 31 includes a circuit board 35, an ultraviolet LED 36 attached to the lower surface of the circuit board 35, a lens 37 arranged to cover the ultraviolet LED 36, a protective cover 38 for holding the lens 37, and the like. The circuit board 35 is formed by forming a circuit made of metal wiring on an insulating plate made of a resin or the like exemplified in a printed wiring board. The circuit board 35 is formed in a circular shape in bottom view, and a power supply unit 44 described later is electrically connected to the circuit of the circuit board 35 via a wiring (not shown). The ultraviolet LED 36 is a light emitting element that converts an electric signal into an optical signal, and emits ultraviolet light. The ultraviolet LED 36 is electrically connected to the circuit of the circuit board 35 and is configured to emit light by the power supplied from the power supply unit 44. The lens 37 is formed of a material having a high UV transparency, such as a silicone resin, and covers the UV LED. The ultraviolet rays pass through the lens 37 and are irradiated downward in the direction perpendicular to the circuit board 35. The protective cover 38 is made of stainless steel or the like, holds the lens 37, and is attached to the circuit board 35. The ultraviolet light emitting unit 31 may have any structure as long as it can emit ultraviolet light by the ultraviolet LED 36, and the above structure is not particularly limited. For example, it may be configured to have a reflecting plate that reflects ultraviolet rays.

The heat sink 32 is a radiator, and is configured to radiate heat generated when the ultraviolet LED 36 emits ultraviolet light. The heat sink 32 is formed of a material having high thermal conductivity such as aluminum. The heat sink 32 is composed of a substantially rectangular flat plate base 40 and a plurality of flat plate projections 41 vertically extending from the upper surface of the base 40. The heat sink 32 is attached to the ultraviolet light emitting unit 31 by bonding the lower surface of the base 40 to the upper surface of the circuit board 35. The heat sink 32 may have any structure as long as it can dissipate heat generated when the ultraviolet LED 36 emits ultraviolet light, and is not limited to the above structure.

The mounting plate 33 is a plate member having a substantially quadrangular shape when viewed from the bottom, and has a circular through hole corresponding to the circuit board 35 in the center. The mounting plate 33 is attached to the heat sink 32 by inserting the ultraviolet light emitting portion 31 into the through hole from the upper side and joining the upper surface to the lower surface of the base portion 40 of the heat sink 32. The mounting plate 33 is larger than the base portion 40 of the heat sink 32, and the outer peripheral edge portion projects outward from the edge of the base portion 40.

Then, the outer peripheral edge portion of the mounting plate 33 is screwed to the partition plate 34, and the ultraviolet LED unit 12 is detachably mounted to the partition plate 34. More specifically, the partition plate 34 has a substantially rectangular through hole corresponding to the base 40 of the heat sink 32. The heat sink 32 is inserted from the lower side into the through hole, and the lower surface of the partition plate 34 and the upper surface of the outer peripheral edge portion of the mounting plate 33 are in close contact with each other. Then, the outer peripheral edge portion of the mounting plate 33 is screwed to the partition plate 34. At this time, since the mounting plate 33 is larger than the base portion 40 of the heat sink 32, the through hole of the partition plate 34 is closed by the ultraviolet LED unit 12.

The outer peripheral edge of the partition plate 34 is bent downward and joined to the flange 28 provided at the lower end of the peripheral wall 14. The partition plate 34 divides the inside of the housing 10 into two chambers, an upper accommodation chamber 42 and a lower accommodation chamber 43. Here, the ultraviolet LED unit 12 is attached to the partition plate 34 so as to traverse the partition plate 34. The heat sink 32 of the ultraviolet LED unit 12 is located in the upper housing chamber 42, and the ultraviolet light emitting section 31 is located in the lower housing chamber 43. That is, the partition plate 34 partitions the interior of the housing 10 into an upper housing chamber 42 in which the heat sink 32 is located and a lower housing chamber 43 in which the ultraviolet light emitting section 31 is located. Further, the intake port 16 is inside the housing 10 and communicates with the upper accommodation chamber 42.

The partition plate 34 partitions the inside of the housing 10 into an upper housing chamber 42 in which the heat sink 32 is located and a lower housing chamber 43 in which the ultraviolet light emitting section 31 is located, and the intake port 16 communicates with the upper housing chamber 42. The structure is not limited to the above-mentioned structure. For example, the partition plate 34 may be configured such that the outer peripheral edge portion is joined to the inner peripheral surface of the peripheral wall 14.

The ultraviolet LED unit 12 may be housed inside the housing 10 with the heat sink 32 facing the upper wall 15 and the ultraviolet light emitting portion 31 facing the cover 11. Etc. are not particularly limited. For example, instead of the partition plate 34, the ultraviolet LED unit 12 may be attached to a support plate that does not divide the interior of the housing 10 into two chambers, an upper housing chamber 42 and a lower housing chamber 43.

The ultraviolet irradiation device 1 includes a power supply unit 44 that supplies electric power supplied from an external power supply to the ultraviolet LED unit 12. The power supply unit 44 is connected to a casing 45 in which a CPU, a power supply circuit, etc. are built in, a main power switch 46, an output adjusting dial 47, a power cable (not shown) connected to an external power source, and the ultraviolet LED unit 12. Wiring and the like (not shown) are provided. Then, the power supply unit 44 is configured to control the current supplied to the ultraviolet LED unit 12 in accordance with the operation of the output adjustment dial 47 and adjust the intensity of the ultraviolet light emitted by the ultraviolet LED 36. The power supply unit 44 is not particularly limited as long as it has a configuration capable of supplying electric power to the ultraviolet LED unit 12 and causing the ultraviolet LED 36 to emit light. Further, the forms of the main power switch 46 and the output adjustment dial 47 are not particularly limited.

The power supply unit 44 is housed in the upper housing chamber 42 inside the housing 10. The power supply unit 44 is supported by the support frame 48 attached to the partition plate 34 so as to be located above the heat sink 32. The support frame 48 is formed by joining or bending a plurality of plate-shaped members, but the configuration, material, etc. are not particularly limited. The main power switch 46 and the output adjusting dial 47 are exposed to the outside through a through hole provided in the side wall 13 in front of the peripheral wall 14. The through hole provided in the side wall 13 in front of the peripheral wall 14 is closed by the casing 45 of the power supply unit 44.

The ultraviolet irradiation device 1 is not limited to the above configuration. For example, the ultraviolet irradiation device 1 may be configured to be remotely operable by an external device. Further, the ultraviolet irradiation device 1 may have a configuration in which the power supply unit 44 is not housed inside the housing 10. However, from the viewpoint of miniaturization, it is preferable that the power supply unit 44 be housed inside the housing 10.

In the ultraviolet irradiation device 1 configured as described above, convection is generated inside the housing 10 by heat generated when the ultraviolet LED 36 emits ultraviolet rays, and outside air is sucked into the housing 10 from the intake port 16 while The air inside the housing 10 is exhausted from the exhaust duct 18. Then, the ultraviolet irradiation device 1 cools the ultraviolet LED 36 by heat exchange with the air passing through the inside of the housing 10.

More specifically, the ultraviolet LED unit 12 is heated by the heat generated when the ultraviolet LED 36 emits ultraviolet light. The heat around the ultraviolet LED unit 12 warms the air around the ultraviolet LED unit 12. Since the warmed air has a low density, it rises, and an upward air flow is generated in the upper housing chamber 42 inside the housing 10. Then, the ascended air passes through the exhaust duct 18 and is discharged from the exhaust port 21 between the upper end of the exhaust duct 18 and the exhaust port cover 19. On the other hand, the outside air whose temperature is lower than the air in the upper accommodation chamber 42 is sucked into the upper accommodation chamber 42 through the intake port 16. As described above, in the ultraviolet irradiation device 1, when the ultraviolet LED unit 12 generates heat, the outside air is sucked into the upper storage chamber 42 through the intake port 16, and the heat exchange between the sucked air and the ultraviolet LED unit 12 is performed. The ultraviolet LED unit 12 is cooled by.

Here, since the ultraviolet LED unit 12 has the heat sink 32 as a radiator, the ultraviolet LED unit 12 can be effectively cooled.

Further, since the upper end of the exhaust duct 18 is covered from above by the exhaust port cover 19, it is possible to prevent dust and the like in the air from entering the upper storage chamber 42 from the exhaust duct 18 due to sedimentation. On the other hand, since the intake port 16 is opened downward by the louver 17, it is possible to prevent dust and the like in the air from entering the upper accommodation chamber 42 from the intake port 16 due to sedimentation. Further, the air taken in from the intake port 16 rises and is taken into the upper accommodation chamber 42, so that dust or the like in the air is unlikely to enter the upper accommodation chamber 42. That is, in the ultraviolet irradiation device 1, the exhaust port cover 19 and the louver 17 can prevent dust and the like in the air from invading the upper storage chamber 42, so that the cooling effect is reduced and the ultraviolet LED unit 12 is broken due to the dust and the like. Can be suppressed.

Further, the ultraviolet irradiation device 1 does not include a filter that prevents dust or the like from entering the upper storage chamber 42. Therefore, the ultraviolet irradiation device 1 does not need to regularly perform maintenance such as cleaning and replacement of the filter, and the flaw detection inspection is not interrupted by these maintenances. Further, the ultraviolet irradiation device 1 has better maintainability as compared with the configuration having the filter, and the running cost can be reduced.

Further, the ultraviolet irradiation device 1 does not include a fan for taking in outside air into the upper housing chamber 42 or discharging air from the exhaust port 21. Therefore, in the ultraviolet irradiation device 1, it is not necessary to regularly perform maintenance such as cleaning and replacement of the fan, and the flaw inspection is not interrupted by these maintenances. Further, the ultraviolet irradiation device 1 has better maintainability and a reduction in running cost as compared with a configuration having a fan.

Further, the exhaust duct 18 extends upward from the upper wall 15 of the housing 10, and the exhaust port 21 is located at the upper end thereof. The air warmed by the heat generated by the ultraviolet LED unit 12 smoothly flows into the exhaust duct 18 and linearly flows upward in the exhaust duct 18. Therefore, the turbulence of the air flow and the retention of the air are unlikely to occur, and the air smoothly flows upward. Therefore, the ultraviolet irradiation device 1 can satisfactorily exhaust the air that has exchanged heat with the ultraviolet LED unit 12, and can effectively cool the ultraviolet LED unit 12.

Further, the ultraviolet irradiation device 1 has a partition plate 34 that partitions the inside of the housing 10 into an upper housing chamber 42 in which the heat sink 32 is located and a lower housing chamber 43 in which the ultraviolet light emitting section 31 is located, and the intake port 16 is located above. It communicates with the storage chamber 42. That is, the outside air that cools the ultraviolet LED unit 12 passes only through the upper housing chamber 42, and the lower housing chamber 43 is kept in a sealed state. In the ultraviolet LED unit 12, the heat sink 32 is located in the upper housing chamber 42. Therefore, in the ultraviolet irradiation device 1, dust and the like are not accumulated on the ultraviolet light emitting portion 31 of the ultraviolet LED unit 12, the ultraviolet light emitting portion 31 can be protected from dust and the like with a simple configuration, and the failure of the ultraviolet LED unit 12 is suppressed. it can.

Further, since the ultraviolet irradiation device 1 includes the spacer 22 as an adjusting mechanism that adjusts the distance D between the upper end of the exhaust duct 18 and the exhaust port cover 19, the size of the exhaust port 21 can be adjusted. Here, the flow velocity of the air flowing in from the intake port 16 is greatly affected by the heat generation amount of the ultraviolet LED unit 12 and the size of the exhaust port 21. That is, by adjusting the size of the exhaust port 21, it is possible to adjust the flow velocity of the air flowing from the intake port 16 into the upper storage chamber 42, and it becomes possible to cool the ultraviolet LED according to the usage environment, which is convenient. good.

From the viewpoint of suppressing the inflow of dust and the like from the intake port 16 and cooling the ultraviolet LED unit 12, the flow velocity of the air flowing from the intake port 16 into the upper housing chamber 42 is preferably 10 to 20 mm/s. If the flow velocity is higher than 20 mm/s, a large amount of dust and the like will flow in from the intake port 16, and the risk of cooling effect due to the dust and the like and the risk of failure of the ultraviolet LED unit 12 will be improved. On the other hand, if the flow velocity is slower than 10 mm/s, the ultraviolet LED 36 cannot be cooled sufficiently.

The opening area of the intake port 16 is preferably larger than the opening area of the exhaust port 21, and the ratio of the opening area of the exhaust port 21 to the opening area of the intake port 16 is about 1 to 1/2. Is preferred. With such a configuration, the flow velocity of the air flowing from the intake port 16 into the upper storage chamber 42 can be easily adjusted. Further, the flow velocity on the side of the intake port 16 is slowed down, and it becomes difficult for dust to enter. On the side of the exhaust port 21, on the contrary, the flow velocity is fast and the dust that has entered is easily discharged. The opening area of the intake port 16 is the sum of the opening areas of all the intake ports 16. The opening area of the exhaust port 21 is the sum of the opening areas of the two exhaust ports 21. The opening area of the exhaust port 21 is the product of the circumferential length at the upper end of the exhaust duct 18 and the distance D between the upper end of the exhaust duct 18 and the lower surface of the exhaust port cover 19.

The distance D between the upper end of the exhaust duct 18 and the lower surface of the exhaust port cover 19 is preferably 5 mm or more and 15 mm or less, and more preferably 12 mm. If the distance D is larger than 15 mm, it becomes difficult to prevent dust and the like from entering the upper storage chamber 42 through the exhaust port 21. If the distance D is smaller than 5 mm, the flow velocity of the air flowing from the intake port 16 into the upper storage chamber 42 becomes slow, and the ultraviolet LED 36 cannot be cooled sufficiently.

Further, the cover 11 is connected to the peripheral wall 14 via a hinge 29, and is swingable between a closed state in which the lower end of the peripheral wall 14 is closed and a released state in which the cover 11 is released. Therefore, the ultraviolet irradiation device 1 can easily open and close the lower end of the peripheral wall 14, which facilitates maintenance such as replacement of the ultraviolet LED unit 12 housed inside the housing 10 and is easy to use.

Further, since the ultraviolet irradiation device 1 houses the power supply unit 44 in the upper housing chamber 42 inside the housing 10, the ultraviolet irradiation device 1 is downsized, is less likely to be restricted by the usage environment, and is easy to use. Further, the ultraviolet irradiation device 1 can adjust the intensity of ultraviolet light in accordance with the operation of the output adjustment dial 47, and thus is convenient.

Next, the ultraviolet flaw detector according to the present embodiment, which includes the ultraviolet irradiation device 1 described above, will be described in detail. FIG. 10 is a schematic diagram showing the configuration of a fluorescent magnetic particle flaw detector 50 as an example of the ultraviolet flaw detector according to the present embodiment. In addition, in FIG. 10, the conveyance direction of the inspection object 60 is indicated by a white arrow, and the inspection object 60 is conveyed from the right side to the left side in FIG. 10.

As shown in FIG. 10, the fluorescent magnetic particle flaw detector 50 is an ultraviolet flaw detector that detects defects such as cracks on the surface of the object 60 to be inspected, such as a long prismatic steel material, by using the fluorescent magnetic powder. The fluorescent magnetic particle flaw detector 50 includes a conveying device 61, a fluorescent magnetic powder spraying device 62, a magnetizing device 63, an air blow device 64, an ultraviolet irradiation device 1, an image pickup device 65, a marking device 66, and the like.
The fluorescent magnetic particle flaw detector 50 also includes a controller, a detector, and the like not shown here.

The transfer device 61 transfers the inspection object 60. The transport device 61 is a roller conveyor including a plurality of rollers and the like, and is configured to transport the inspection object 60 at a desired speed. Then, the inspection object 60 is conveyed from the right side where the fluorescent magnetic powder spraying device 62 is located to the left side where the marking device 66 is located in FIG. The transport device 61 includes a transport distance measuring device (not shown). The transport distance measuring device measures the transport distance of the inspection object 60. As the transport distance measuring device, a measuring device including a rotary encoder that measures the rotational displacement of the roller of the transport device 61 can be used. The configuration of the transport distance measuring device is not particularly limited, and a non-contact measuring device such as a laser surface velocity meter may be used, or a combination of these may be used. Further, the configuration of the transport device 61 is not particularly limited, and may be, for example, a belt conveyor including an endless belt.

The fluorescent magnetic powder spraying device 62 sprays the fluorescent magnetic powder test liquid on the surface of the inspection object 60, and is arranged on the upstream side in the transport direction. The fluorescent magnetic powder dispersal device 62 includes a tank, a pump, a nozzle, and the like, which are not shown. The fluorescent magnetic powder inspection liquid stored in the tank is pumped to the nozzle by the pump, and the fluorescent magnetic powder inspection liquid is ejected from the nozzle. The fluorescent magnetic powder test liquid is a solution containing magnetic powder (fluorescent magnetic powder) whose surface is coated with a phosphor. The fluorescent magnetic powder spraying device 62 is configured to continuously spray a desired amount of the fluorescent magnetic powder test liquid on the surface of the inspection object 60. The configuration of the fluorescent magnetic powder spraying device 62 is not particularly limited.

The magnetizing device 63 applies a magnetic field to the inspection object 60, and is arranged adjacent to the downstream side of the fluorescent magnetic powder scattering device 62. The magnetizing device 63 is arranged between the two penetrating coils 67, 68 and the two penetrating coils 67, 68 that are arranged to face each other on the upstream side and the downstream side in the conveying direction, and form a line in the conveying direction. It is composed of two inter-pole coils 69, 70, etc. which are arranged. The through coils 67 and 68 are formed in an annular shape, and the inspection object 60 is conveyed so as to penetrate the center thereof. On the other hand, the inter-electrode coils 69 and 70 are formed in a U shape, and the inspection object 60 is conveyed so as to pass through the gap. The magnetizing device 63 can generate a uniform rotating magnetic field between the two through coils 67 and 68 by including the two pole coils 69 and 70.

More specifically, a current flows through the through coils 67, 68 and the inter-electrode coils 69, 70, whereby a magnetic field is generated in the through coils 67, 68 in the transport direction of the inspection object 60, and in the inter-electrode coils 69, 70. A magnetic field is generated in the direction that is the direction of the air gap, which is orthogonal to the transport direction of the inspection object 60. When an alternating current having a phase difference of 90 degrees flows through the through coils 67, 68 and the inter-electrode coils 69, 70, the direction of the magnetic field generated by the through coils 67, 68 (the carrying direction) and the inter-electrode coils 69, 70. A rotating magnetic field that rotates with a constant magnetic field strength is generated in a plane formed by the direction of the magnetic field generated by (direction orthogonal to the transport direction).

The configuration of the magnetizing device 63 is not particularly limited, and the numbers of the through coils 67 and 68 and the inter-electrode coils 69 and 70 can be appropriately designed. For example, the magnetizing device 63 may be configured to further include a plurality of gap coils in addition to the gap coils 69 and 70. The magnetizing device 63 may be composed of one through coil 67 and one inter-pole coil 69.

The air blowing device 64 blows air toward the inspection object 60 in a direction against gravity. The air blow device 64 is between the two through coils 67 and 68, between the through coil 67 and the interelectrode coil 69, between the two interelectrode coils 69 and 70, and between the interelectrode coil 70 and the through coil 68. Are provided between each. By the air blow device 64, the flow velocity of the fluorescent magnetic powder inspection liquid flowing on the surface of the inspection object 60 can be adjusted. The configuration of the air blow device 64 is not particularly limited.

The ultraviolet irradiation device 1 is arranged between the two through coils 67 and 68 so as to irradiate the fluorescent magnetic powder inspection liquid on the surface of the inspection object 60 with ultraviolet light from above. The ultraviolet irradiation device 1 is disposed at a predetermined distance, for example, about 600 mm to 2000 mm from the inspection object 60 in order to avoid the influence of the strong rotating magnetic field generated by the magnetizing device 63. The ultraviolet irradiation device 1 may be provided with a magnetic shield.

The image pickup device 65 is for picking up an image of the surface of the inspection object 60 irradiated with ultraviolet rays by the ultraviolet ray irradiation device 1. The imaging device 65 is arranged so that the surface of the inspection object 60 can be imaged from above. Further, the imaging device 65 is arranged at a predetermined distance from the inspection object 60, for example, about 600 mm to 2000 mm, and is provided with a magnetic shield in order to avoid the influence of the strong rotating magnetic field generated by the magnetizing device 63. Has been done. An area camera or a line camera can be used as the imaging device 65, and is not particularly limited. For example, a CCD (Charge Coupled Device) camera can be used.

Here, the detection device (not shown) reads the image signal (original image) picked up by the image pickup device 65 and performs a predetermined process on the original image to detect a defect on the surface of the inspection object 60. Yes, its configuration will be described later.

The marking device 66 is for visually marking a defect on the surface of the inspection object 60 detected by the detection device. As the marking device 66, for example, a marking gun that performs marking by ejecting ink using air pressure can be used. The configuration of the marking device 66 is not particularly limited.

Next, a control system of the fluorescent magnetic particle flaw detector 50 according to the present embodiment will be described. FIG. 11 is a block diagram of a control system of the fluorescent magnetic particle flaw detector 50. The fluorescent magnetic particle flaw detector 50 includes a controller 71, and the controller 71 controls the transport device 61, the fluorescent magnetic powder spraying device 62, the magnetizing device 63, the air blow device 64, the imaging device 65, the marking device 66, the detecting device 72, and the like. In addition, it is configured so that a defect on the surface of the inspection object 60 can be detected by automatic control. The ultraviolet irradiation device 1 is manually operated by a worker.

The controller 71 is configured to read input signals such as various set values and detection values from various sensors and output control signals to control the operation of various devices included in the fluorescent magnetic particle flaw detector 50. There is. Examples of the controller 71 include a CPU (Central Processing Unit) that performs arithmetic processing and control processing, a main storage device that stores data, a timer, an input circuit, an output circuit, and a microcomputer including a power supply circuit. .. A main storage device exemplified by a ROM (Read Only Memory) and an EEPROM (Electrically Erasable Programmable Read Only Memory) stores a control program for executing the operation according to the present embodiment and various data. The various programs and data may be stored in an external storage device and read by the controller 71.

The controller 71 is electrically connected to a carrier device 61, a fluorescent magnetic powder spraying device 62, a magnetizing device 63, an air blow device 64, an imaging device 65, a marking device 66, a detecting device 72, and the like. .. The controller 71 is electrically connected to various sensors other than the configuration shown in FIG.

Like the controller 71, the detection device 72 includes a processing device that performs arithmetic processing and control processing, a main storage device that stores data, and the like. For example, a CPU, a main storage device, a timer, an input circuit, an output circuit, A microcomputer having a power supply circuit and the like. The main storage device stores a program for detecting defects in the original image, various data, and the like. The configuration of the detection device 72 is not particularly limited. For example, the programs and data stored in the main storage device may be stored in an external storage device and read by the detection device 72.

As described above, the detection device 72 reads the original image imaged by the imaging device 65 and performs predetermined image processing on the read original image. Examples of image processing include LUT (Look Up Table) conversion processing, enlargement/contraction processing, shading processing, and binarization processing. Then, the detection device 72 determines the presence or absence of a defect in the image subjected to the image processing, and detects the defect. The detection device 72 is not particularly limited as long as it has a configuration capable of detecting a defect from the original image captured by the image capturing device 65.

Next, the operation of the fluorescent magnetic particle flaw detector 50 will be described. The fluorescent magnetic particle flaw detector 50 is configured to sequentially convey the object 60 to be inspected to each apparatus by the conveyor 61 and detect a flaw on the surface of the object 60 to be inspected. The ultraviolet irradiator 1 always irradiates ultraviolet rays at the time of inspection, and an operator turns the power on and off.

The inspection object 60 is first conveyed to the magnetic powder spraying device 62, and the fluorescent magnetic powder test liquid is sprayed on the surface thereof. The inspection object 60 having the fluorescent magnetic powder inspection liquid sprinkled on its surface is conveyed into the rotating magnetic field region formed by the magnetizing device 63.

At this time, if there is a defect on the surface of the inspection object 60, a leakage magnetic field is generated due to the defect, and the fluorescent magnetic powder contained in the fluorescent magnetic powder inspection liquid is attracted to the leakage magnetic field. Here, since the magnetic field formed by the magnetizing device 63 is rotating, a leakage magnetic field is generated regardless of the extending direction (shape) of the defect, and the magnetic particles are attracted to the defect. Then, the fluorescent magnetic powder collects on the defect, so that the fluorescent magnetic powder indicating pattern due to the defect is formed on the surface of the inspection object 60.

The flow velocity of the fluorescent magnetic powder inspection liquid flowing on the surface of the inspection object 60 is appropriately adjusted by the air blow device 64. From the viewpoint of stably forming the fluorescent magnetic powder instruction pattern, the flow rate of the fluorescent magnetic powder test liquid is preferably 5 to 100 mm/s. When the flow rate of the fluorescent magnetic powder inspection liquid is higher than 100 mm/s, the fluorescent magnetic powder is less likely to be attracted to the leakage magnetic field due to the defect, and the fluorescent magnetic powder indicating pattern becomes unstable. On the other hand, if the flow rate of the fluorescent magnetic powder inspection liquid is slower than 5 mm/s, it takes a long time to form a stable fluorescent magnetic powder instruction pattern, which leads to a reduction in inspection efficiency.

The fluorescent magnetic powder instruction pattern thus formed is imaged by the imaging device 65 by exciting the phosphor that covers the surface of the fluorescent magnetic powder with the ultraviolet light emitted from the ultraviolet irradiation device 1. The original image imaged by the imaging device 65 is sent to the detection device 72. The detection device 72 performs a predetermined process on the original image, detects a defect in the original image, and sends the position data to the controller 71. Then, the controller 71 controls the operation of the marking device 66 based on the position data of the defect and the measurement data of the transport distance measuring device of the transport device 61 to mark the defect on the surface of the inspection object 60.

The fluorescent magnetic particle flaw detector 50 as the ultraviolet flaw detector is not limited to the above-described configuration. For example, the controller 71 and the detection device 72 may be integrally configured. With such a configuration, the fluorescent magnetic particle flaw detector 50 can be simplified and downsized. Alternatively, the controller 71 may control the ultraviolet irradiation device 1.

As described above, the ultraviolet irradiation device 1 according to the present embodiment has a top-shaped cylindrical housing having the cylindrical peripheral wall 14 extending in the vertical direction and the upper wall 15 closing the upper end of the peripheral wall 14. 10, an ultraviolet LED unit 12 having an ultraviolet LED 36 and a heat sink 32, and a cover 11 closing the lower end of the peripheral wall 14, the ultraviolet LED unit 12 has a heat sink 32 facing the upper wall 15 and the housing 10. The housing 10 has a cylindrical shape that penetrates through the peripheral wall 14 and communicates with the inside, and the housing 10 has an intake port 16 that opens downward by a louver 17 and an upper port 15 that extends upward and communicates with the inside. The cover 11 includes an exhaust duct 18, the cover 11 includes an ultraviolet ray transmitting portion 25 that transmits ultraviolet rays emitted by the ultraviolet LED 36, and exhaust air that covers the upper end of the exhaust duct 18 from above with a predetermined interval. This is a configuration including a mouth cover 19. Further, the fluorescent magnetic particle flaw detector 50 according to the present embodiment is configured to include the above-described ultraviolet irradiation device 1.

Then, according to the present embodiment, it is possible to provide an ultraviolet irradiation device and an ultraviolet flaw detection device that have good maintainability and can reduce running costs.

Hereinafter, the present disclosure will be described in more detail and specifically with reference to Examples. However, the present disclosure is not limited to the following examples.

<Material>
[Example 1]
The ultraviolet irradiation device 1 according to this embodiment shown in FIGS. 1 to 9 was used. That is, the ultraviolet irradiation device 1 has a cylindrical housing 10 having a cylindrical peripheral wall 14 extending in the vertical direction and an upper wall 15 closing the upper end of the peripheral wall 14, an ultraviolet LED 36, and a heat sink 32. The ultraviolet LED unit 12 and the cover 11 that closes the lower end of the peripheral wall 14 are provided. The ultraviolet LED unit 12 is housed in the housing 10 with the heat sink 32 facing the upper wall 15, and the housing 10 penetrates the peripheral wall 14. The cover 11 has an intake port 16 that communicates with the interior and that opens downward by the louver 17, and a cylindrical exhaust duct 18 that extends upward from the upper wall 15 and communicates with the interior. It has a feature that it has an ultraviolet ray transmitting portion 25 that transmits the ultraviolet rays emitted by the ultraviolet ray LED 36, and that it further has an exhaust port cover 19 that covers the upper end of the exhaust duct 18 from above from above with a predetermined interval. ..

The housing 10, the exhaust port cover 19, the frame 26 of the cover 11, the heat sink 32, and the partition plate 34 were made of aluminum. The width of the housing 10 in the left-right direction was 340 mm, the width in the front-rear direction was 340 mm, and the height in the up-down direction was 140 mm. The width of the heat sink 32 in the left-right direction was 70 mm, the width in the front-back direction was 70 mm, the height in the up-down direction was 40 mm, and the number of protrusions was 105 (7 rows×15 columns). The length of the exhaust duct 18 is 35 mm, the distance D between the upper end of the exhaust duct 18 and the exhaust port cover 19 is 15 mm, the number of the intake ports 16 is 34, the area of the intake ports 16 is 5440 mm ² , and the exhaust port 21 Area was 5652 mm ² , and the ratio of the opening area of the exhaust port 21 to the opening area of the intake port 16 was 1.04. The ultraviolet LED 36 had a forward voltage of 15.4 V, an optical output of 2 W, and a peak wavelength of 365 nm.

<Evaluation method>
(Cooling performance test)
The cooling performance of Example 1 was measured. Set the output adjustment dial 47 so that the ultraviolet intensity at the center of the ultraviolet irradiation area at an ultraviolet irradiation distance of 600 mm is about 6000 μW/cm ^2, and set the junction temperature of the ultraviolet LED 36 when continuously irradiating ultraviolet rays for 24 hours. , The ambient temperature was 20° C. and 40° C. When the ambient temperature was 20°C, the junction temperature was about 80°C, and when the ambient temperature was 40°C, the junction temperature was about 100°C. The junction temperature was calculated from the measured value of the temperature of the solder joint of the ultraviolet LED 36.

(Dust removal performance)
After the cooling performance test was completed, the presence or absence of dust in the upper storage chamber 42 was visually confirmed. In both cases where the ambient temperature was 20° C. and 40° C., no dust adhered to the heat sink 32 and no dust in the upper storage chamber 42.

The ultraviolet irradiation device 1 according to the present embodiment from the above-described embodiment can suppress the heat generation of the ultraviolet LED 36 to 100° C. or less, can suppress the inhalation of dust into the inside, and can use the ultraviolet LED 36 without using a fan or a filter. It was shown that sufficient cooling was possible. Therefore, in the present embodiment, it is shown that the ultraviolet irradiation device 1 having good maintainability and capable of reducing the running cost is provided.

INDUSTRIAL APPLICABILITY The present disclosure can be suitably used for an ultraviolet irradiation device that irradiates ultraviolet rays and an ultraviolet flaw detection device that includes the ultraviolet irradiation device. However, the present disclosure is not limited to the above-described embodiments and examples. INDUSTRIAL APPLICABILITY The ultraviolet irradiation device of the present disclosure is useful for all tests and inspections using ultraviolet rays, such as contamination check, leak inspection, and degreasing cleaning confirmation. Further, the ultraviolet flaw detection apparatus of the present disclosure is not limited to the fluorescent magnetic particle flaw detection apparatus, and may be a penetration flaw detection apparatus that detects defects on the surface of the object to be inspected using a fluorescent penetrant, and uses ultraviolet rays. The present invention can be applied to any ultraviolet flaw detector that detects flaws.

1 UV Irradiation Device 10 Housing 11 Cover 12 UV LED Unit 14 Peripheral Wall 15 Upper Wall 16 Intake Port 17 Louver 18 Exhaust Duct 19 Exhaust Port Cover 22 Spacer (Adjustment Mechanism)
25 Ultraviolet Transmitting Part 29 Hinge 32 Heat Sink 34 Partition Plate 36 Ultraviolet LED
42 Upper accommodation chamber 43 Lower accommodation chamber 44 Power supply unit 50 Fluorescent magnetic particle flaw detector (ultraviolet flaw detector)
D Distance between the upper end of the exhaust duct and the lower surface of the exhaust port cover

Claims (5)

A topped tubular housing having a tubular peripheral wall extending in the vertical direction and an upper wall closing the upper end of the peripheral wall;
An ultraviolet LED unit having an ultraviolet LED and a heat sink,
A cover for closing the lower end of the peripheral wall,
In the ultraviolet LED unit, the heat sink is housed in the housing so as to face the upper wall,
The housing has an intake port that penetrates the peripheral wall and communicates with the inside, and opens downward by a louver, and a cylindrical exhaust duct that extends upward from the upper wall and communicates with the inside. ,
The cover has an ultraviolet light transmitting portion that transmits the ultraviolet light emitted by the ultraviolet LED,
The ultraviolet irradiation device further comprises an exhaust port cover that covers the upper end of the exhaust duct from above with a predetermined gap. A hinge for swingably connecting the cover to the peripheral wall between a closed state in which the lower end of the peripheral wall is closed and a released state in which the lower end of the peripheral wall is released.
The ultraviolet irradiation device according to claim 1. An adjusting mechanism for adjusting a distance between the upper end of the exhaust duct and the exhaust port cover is provided.
The ultraviolet irradiation device according to claim 1 or 2. A power supply unit capable of adjusting the intensity of ultraviolet rays emitted by the ultraviolet LED is housed in the housing.
The ultraviolet irradiation device according to any one of claims 1 to 3. An ultraviolet flaw detection device comprising the ultraviolet irradiation device according to any one of claims 1 to 4.

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