JP6583077B2 - Camera hood - Google Patents

Description

  The present invention relates to a camera hood used when performing camera observation in an environment in which water splash, dust, grease, or the like is scattered, for example, in a hot rolling process.

For example, when performing camera observation in an environment where deposits are generated on a camera lens or a transparent plate placed in front of the camera lens, the camera lens or the transparent plate becomes dirty and the camera is observed stably for a long time. Could not do.
Here, as a means for removing and preventing the attached matter on the camera lens and the transparent plate, for example, various techniques as shown in Patent Document 1-5 have been proposed.

  Patent Document 1 proposes a technique for reducing the adhesion of snow and ice on a front panel and a wiper by arranging a sheet member that deforms and vibrates when receiving wind pressure around a camera case that houses a surveillance camera.

  Patent Document 2 has a columnar first space and a second space arranged around the outside of the first space, supplies gas to the second space, and provides a space between the first space and the second space. There has been proposed a technique for keeping the inside of the first space clean by allowing gas to be uniformly circulated in the first space through the permeation portion provided in the partition wall.

  In Patent Document 3, air is supplied from the rear to the front of the camera inside a camera case configured to have an opening in front of the lens of the camera and cover the camera except for the opening. A technique has been proposed in which rolling oil fume or the like is prevented from being caught in the camera case by sucking air that is exposed to the outside of the camera case from the side of the opening around the portion.

  In Patent Literature 4, in an air purge hood fixed to a camera case provided with a transparent plate, a first air discharge port that discharges air along the outer surface of the transparent plate, and an outside of the first air discharge port. There has been proposed a technique for preventing dust from adhering to the transparent plate by providing a second air discharge port that is provided and discharges air in a direction away from the outer surface of the transparent plate.

  Patent Document 5 includes a first case having an observation window, and a second case that encloses the first case. By purging from between the first case and the second case, A technique for suppressing dirt on the observation window of the first case has been proposed.

JP 2008-113363 A JP 2003-248158 A JP2013-105169A JP 2001-108880 A Japanese Patent Laying-Open No. 2015-139094

  By the way, for example, in the hot rolling process, water droplets, dust, grease, and the like are scattered, and the adhesion of dirt to the camera lens and the transparent plate is remarkable. For this reason, as described in Patent Document 1, the arrangement of the vibrating sheet member cannot sufficiently suppress the adhesion of dirt to the camera lens or the transparent plate, and the camera observation is stabilized for a long time. Could not be done.

  Moreover, in patent documents 2-5, although adhesion of the stain | pollution | contamination to a camera lens or a transparent plate is suppressed by gas purges, such as air, gas flow rate and gas flow velocity are inadequate, for example, a hot rolling process etc. In an environment where a large amount of water splashes, dust, grease, etc. are scattered, there is a possibility that adhesion of dirt to the camera lens or the transparent plate cannot be sufficiently suppressed. Further, even if the purge gas flow rate is increased in order to ensure the gas flow rate and gas flow rate, the gas flow becomes non-uniform, and there is a risk that these water droplets, dust, grease, etc. will be involved.

  The present invention has been made in view of the above-described situation, and can sufficiently suppress the adhesion of dirt to a transparent plate disposed opposite to a camera lens and perform camera observation stably for a long time. It aims at providing the camera hood which can do.

  In order to solve the above-described problem, a camera hood according to the present invention includes a transparent plate disposed to face a lens of an imaging camera, and a hood main body extending on the opposite side of the transparent plate from the imaging camera. The purge plate is disposed at one end of the hood main body, an opening window is formed at the other end of the hood main body, and the hood main body is provided with a gas outlet for ejecting purge gas. Are disposed in the hood body, and a gas introduction header having a connection port that opens to face a side surface of the purge gas header is disposed, and an introduction pipe is connected to the gas introduction header. It is characterized by being.

  According to the camera hood of this configuration, when gas is ejected from the purge gas header, the inside of the hood main body becomes negative pressure, and external gas is sucked into the hood main body through the introduction pipe and the gas introduction header. The external gas is blown out together with the purge gas from the opening window portion of the hood main body, so that the gas flow in the opening window portion of the hood main body becomes relatively uniform and the gas flow rate and flow velocity are ensured. Thereby, it is possible to suppress water droplets, dust, grease, and the like from being caught in the hood main body, and to prevent dirt from adhering to the transparent plate. Therefore, camera observation can be performed stably for a long time even in an environment where water droplets, dust, grease, etc. are scattered, for example, in a hot rolling process.

Here, in the camera hood of the present invention, it is preferable that the purge gas header is arranged so that the perpendiculars extending from the gas ejection port respectively pass through the opening range of the opening window.
In this case, the purge gas ejected from the gas outlet of the purge gas header can be prevented from colliding with the side wall of the hood body, the gas flow is stabilized, and water splashes, dust, grease, etc. enter the hood body. Can be suppressed.

Further, in the camera hood of the present invention, the one end side end of the hood main body among the connection ports of the gas introduction header is located on one end side of the hood main body with respect to the gas outlet of the purge gas header. Preferably it is.
In this case, since the connection port of the gas introduction header is located in a region where a negative pressure is easily generated by blowing the purge gas from the purge gas header, sufficient external gas is sufficiently introduced into the hood main body through the introduction pipe and the gas introduction header. Can be aspirated.

Furthermore, in the camera hood of the present invention, it is preferable that the hood main body, the purge gas header, the gas introduction header, and the introduction pipe are made of stainless steel.
In this case, generation | occurrence | production of the rust in the said food | hood main body, the said purge gas header, the said gas introduction header, and the said introduction piping can be suppressed, and the stain | pollution | contamination of the transparent plate by this rust can be suppressed. Further, durability of the hood main body, the purge gas header, the gas introduction header, and the introduction pipe is improved, and the life of these can be extended.

  As described above, according to the present invention, it is possible to provide a camera hood that can sufficiently suppress the adhesion of dirt to a transparent plate disposed opposite to a camera lens and can perform camera observation stably for a long time. It becomes possible to do.

It is a section explanatory view of the camera hood which is one embodiment of the present invention. It is side surface explanatory drawing of the camera hood shown in FIG. It is explanatory drawing of the purge gas header with which the camera hood which is this embodiment was equipped. In an Example, it is a figure which shows the measurement position of the wind speed (gas flow velocity) in an opening window part. In an Example, it is a graph which shows the distribution state of the wind speed (gas flow velocity) in an opening window part.

Hereinafter, a camera hood according to an embodiment of the present invention will be described with reference to the accompanying drawings. In addition, this invention is not limited to the following embodiment.
The camera hood 1 according to the present embodiment is used when observing with the imaging camera 50 in an environment where water droplets, dust, and grease are scattered, for example, in a hot rolling process.

  The camera hood 1 includes a hood main body 10, a transparent plate 20 disposed on one end side (the lower side in FIGS. 1 and 2) of the hood main body 10, and a purge gas header 30 disposed inside the hood main body 10. A gas introduction header 40 connected to the side wall 11 of the hood main body 10 and an introduction pipe 45 connected to the gas introduction header 40 are provided. In the present embodiment, the hood body 10, the purge gas header 30, the gas introduction header 40, and the introduction pipe 45 are made of stainless steel. Further, a glass plate is used as the transparent plate 20.

The hood main body 10 has a substantially cylindrical shape, the transparent plate 20 is disposed on one end side (lower side in FIGS. 1 and 2), and the other end side (upper side in FIGS. 1 and 2) is the opening window 15. Has been.
In this embodiment, as shown in FIG.1 and FIG.2, the area of the opening window part 15 is made smaller than the area of the transparent plate 20, and the side wall 11 of the hood main body 10 is shown in FIG. The main body 10 is inclined so as to gradually go inward from one end side to the other end side (from below to above).

As shown in FIGS. 1 to 3, the purge gas header 30 has a substantially circular tube shape, and extends along the long side direction of the transparent plate 20 and the long side direction of the opening window 15 on one end side inside the hood body 10. It is arranged to extend. In the present embodiment, as shown in FIG. 1, two purge gas headers 30 are arranged in parallel to each other.
As shown in FIG. 3, the purge gas header 30 is provided with a plurality of gas ejection ports 31. The gas outlets 31 are arranged at equal intervals with the same diameter. For example, the gas outlet 31 preferably has a hole diameter in the range of 1 mm or more and 4 mm or less, and the number thereof is preferably 6 or more and 96 or less in one purge gas header 30.
The purge gas header 30 is provided with purge gas pressure adjusting means (not shown) for setting the static pressure value of the purge gas to 19 kPa or more.

The purge gas header 30 is arranged such that the vertical line V (that is, the gas ejection direction from the gas ejection port 31) extending from the gas ejection port 31 passes through the opening range of the opening window 15. Yes.
In the present embodiment, the vertical line V extending from the gas ejection ports 31 of the two purge gas headers 30 is configured not to collide in the hood body 10. Further, as shown in FIG. 1, the vertical line V extending from the gas outlet 31 of the purge gas header 30 is positioned in the region from the opening end of the hood main body 10 to ¼ width of the opening width. Has been.

As shown in FIG. 1, the gas introduction header 40 is disposed so as to be opposed to the side surfaces of the two purge gas headers 30.
In the present embodiment, as shown in FIG. 1, one end side end of the hood body 10 of the connection port 41 of the gas introduction header 40 is one end side (lower side in FIG. 1) of the hood body 10 relative to the purge gas header 30. Is located.
The inlet pipe 45 connected to the gas inlet header 40 is open to the clean air atmosphere at the end opposite to the gas inlet header 40.

As shown in FIG. 1, the camera hood 1 having such a configuration has the transparent plate 20 disposed opposite to the lens of the imaging camera 50, and the hood main body 10 on the opposite side of the imaging plate 50 of the transparent plate 20. Is positioned with respect to the imaging camera 50 so as to be positioned.
Here, the purge gas header 30 and the like disposed inside the hood main body 10 are disposed so as not to interfere with the field of view of the imaging camera 50.
Further, the viewing angle of the imaging camera 50 on the short side of the opening window 15 of the hood main body 10 is within 20 °, and the viewing angle of the imaging camera 50 on the short side of the opening window 15 is within 80 °. Further, the height of the hood main body 10, the long side length and the short side length of the opening window 15 are designed.

  When performing observation with the imaging camera 50 using the camera hood 1 described above, purge gas is ejected from the purge gas header 30 toward the opening window 15. At this time, the static pressure value of the purge gas is preferably 19 kPa or more. This is because if the static pressure value is less than 19 kPa, the amount of purge gas is small, the negative pressure inside the hood body 10 cannot be increased, and the uniformity of the purge gas wind speed in the long side direction is impaired. By setting the static pressure value to 19 kPa or more, clean air is sucked into the hood main body 10 through the introduction pipe 45 and the gas introduction header 40, and this clean air together with the purge gas has a high wind speed toward the opening window 15. The wind speed uniformity is improved and blown out.

  According to the camera hood 1 of the present embodiment configured as described above, the clean air sucked into the hood main body 10 through the introduction pipe 45 and the gas introduction header 40 together with the purge gas from the purge gas header 30 is Since it blows off from the opening window part 15 of the hood main body 10, the gas flow in the opening window part 15 of the hood main body 10 becomes comparatively uniform, and a gas flow rate and a flow velocity are ensured. Thereby, the mixture of splashes such as water droplets, dust, and grease into the hood main body 10 is suppressed, and it is possible to prevent the dirt from adhering to the transparent plate 20. Therefore, for example, even in an environment where water droplets, dust, grease, or the like, such as in a hot rolling process, is scattered, observation with the imaging camera 50 can be performed stably for a long time.

  Further, in the present embodiment, since the purge gas pressure adjusting means for setting the static pressure value of the purge gas to 19 kPa or more is provided, by setting the static pressure value of the purge gas in the purge gas header 30 to 19 kPa or more, the introduction pipe 45 and the gas introduction Clean air can be sufficiently sucked into the hood main body 10 via the header 40, and a sufficient gas flow rate can be secured from the opening window portion 15 of the hood main body 10.

In the present embodiment, the purge gas header 30 is disposed so that the perpendicular lines V extending from the gas outlet 31 pass through the opening range of the opening window 15, respectively. It is possible to suppress the purge gas ejected from 31 from colliding with the side wall 11 of the hood main body 10 and the like, and the purge gas can be stably blown out from the opening window 15.
Further, in the present embodiment, the perpendicular lines V extending from the gas outlets 31 of the two purge gas headers 30 are configured not to collide with each other in the hood main body 10, so that the purge gases ejected from the two purge gas headers 30 Can be prevented from colliding inside the hood body 10, and the flow of purge gas can be stabilized.
In the present embodiment, the vertical line V extending from the gas outlet 31 of the purge gas header 30 is located in the region from the opening end of the hood main body 10 to a quarter width of the opening width. Therefore, the flow rate and flow rate of the purge gas are ensured also at the edge of the opening window 15 where gas tends to stay.

  Furthermore, in this embodiment, the one end side end part of the hood main body 10 of the connection port 41 of the gas introduction header 40 is located on one end side (lower side in FIG. 1) of the hood main body 10 with respect to the purge gas header 30. Therefore, the connection part of the gas introduction header 40 is located in a region where a negative pressure is easily generated by blowing the purge gas from the purge gas header 30, and clean air is introduced into the hood main body 10 via the introduction pipe 45 and the gas introduction header 40. Sufficient suction is possible.

  Moreover, in this embodiment, since the food | hood main body 10, the purge gas header 30, the gas introduction header 40, and the introduction piping 45 are comprised with stainless steel, generation | occurrence | production of rust can be suppressed and the transparent plate 20 resulting from this rust can be suppressed. Dirt can be suppressed. Further, the durability of the hood body 10, the purge gas header 30, the gas introduction header 40, and the introduction pipe 45 is improved, and the life of these can be extended.

Further, in the present embodiment, the purge gas header 30 and the like disposed inside the camera hood 1 are arranged so as not to interfere with the field of view of the imaging camera 50, so that the imaging camera 50 is good via the camera hood 1. Can be observed.
In this embodiment, the viewing angle of the imaging camera 50 on the short side of the opening window 15 of the hood body 10 is within 20 °, and the viewing angle of the imaging camera 50 on the short side of the opening window 15 is 90. Since the hood main body 10 is configured so as to be within the range, the field of view of the imaging camera 50 can be sufficiently ensured.

The camera hood according to the embodiment of the present invention has been described above, but the present invention is not limited to this, and can be appropriately changed without departing from the technical idea of the present invention.
For example, the shape of the hood main body and the size of the transparent plate and the opening window are not limited to those exemplified in this embodiment.

  Below, the result of the confirmation experiment implemented in order to confirm the effect of this invention is demonstrated.

  As an example of the present invention, using the camera hood described in the present embodiment, purge air is ejected from the purge gas header, and clean air is sucked into the hood main body through the introduction pipe and the gas introduction header, and the purge air and clean air are supplied to the hood. It blows out from the opening window part of the main body. At this time, the static pressure value of the purge gas was set to 19 kPa or more.

  As a comparative example, using the camera hood described in the present embodiment that does not connect the introduction pipe and the gas introduction header, purge air was ejected from the purge gas header, and the purge air was blown out from the opening window of the hood main body. At this time, the static pressure value of the purge gas was set to 19 kPa or more.

  In this embodiment, two purge gas headers are provided in the hood body, and 24 gas outlets each having a diameter of 2 mm are provided in the purge gas header, and these gas outlets are arranged in a line.

  And in this invention example and the comparative example, the flow velocity (wind velocity) distribution of the gas in an opening window part was evaluated. As shown in FIG. 4, a position 5 mm inside from the edge of the opening window is used as a measurement region, and there are a total of 21 measurement points, 7 positions equally in the long side direction and 3 positions equally in the short side direction of the opening window. The wind speed was measured with and the wind speed distribution was evaluated. The evaluation results are shown in FIG.

  As shown in FIG. 5, in the example of the present invention, the average wind speed is about twice that of the comparative example, and it is confirmed that the wind speed (gas flow rate) in the opening window is increased. Moreover, in the example of this invention, the dispersion | variation in a wind speed is about 30% smaller than the comparative example, and it is confirmed that the wind speed (gas flow velocity) in an opening window part is equalized.

  From the above, according to the example of the present invention, the flow velocity of the gas blown out from the opening window portion can be increased, and the flow velocity distribution can be made uniform, so that water droplets, dust, grease, etc. are contained inside the hood body. It can suppress being caught. Therefore, even in an environment where water droplets, dust, grease, or the like scatters, observation with an imaging camera can be performed stably for a long time.

DESCRIPTION OF SYMBOLS 1 Camera hood 10 Hood main body 11 Side wall 15 Opening window part 20 Transparent plate 30 Purge gas header 40 Gas introduction header 41 Connection port 45 Introduction piping 50 Imaging camera

Claims (4)

A transparent plate disposed opposite to the lens of the imaging camera, and a hood body extending on the opposite side of the transparent plate from the imaging camera,
The transparent plate is disposed at one end of the hood body, and an opening window is formed at the other end of the hood body,
Inside the hood body, two or more purge gas headers provided with gas outlets for ejecting purge gas are disposed,
A camera hood characterized in that a gas introduction header having a connection port that opens opposite to a side surface of the purge gas header is disposed in the hood main body, and an introduction pipe is connected to the gas introduction header.   2. The camera hood according to claim 1, wherein the purge gas header is disposed so that a perpendicular extending from the gas ejection port passes through an opening range of the opening window.   The one end side end of the hood main body among the connection ports of the gas introduction header is located on one end side of the hood main body with respect to the gas jet port of the purge gas header. The camera hood according to claim 2.   The camera hood according to any one of claims 1 to 3, wherein the hood main body, the purge gas header, the gas introduction header, and the introduction pipe are made of stainless steel.

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