JPH0559262U - Dustproof hood purge device for detector - Google Patents

Abstract

(57) [Summary] [Purpose] To provide means for preventing intrusion of falling objects such as dust containing water, water droplets and scale into the dust-proof hood of various detectors. [Structure] A wide-angle flat purge nozzle 4 is installed substantially vertically toward the upper part of the dustproof hood opening close to the dustproof hood 3 installed upward. Further, the narrow-angle flat purge nozzle 5 is installed at an appropriate distance from the wide-angle flat purge nozzle so that the narrow-angle flat purge nozzle 5 is substantially horizontal toward the upper part of the dustproof hood opening. A nozzle cover is attached above the wide-angle flat purge nozzle and the narrow-angle flat purge nozzle. [Effect] Since the upper part of the opening of the dustproof hood can be purged with air, it is possible to prevent the falling of dust, including water drops, water droplets, scales, etc., falling from the material into the dustproof hood. The nozzle cover can protect the air purge nozzle.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an air purging device on a dustproof hood that prevents fine dust from adhering to lenses, mirrors, and glass of optical devices such as various detectors.

[0002]

[Prior Art]

Various optical equipment installed in a bad environment where dust, water vapor, etc. are generated, such as a transport line for high-temperature steel materials, such as a photoelectric detector for detecting the position of steel materials, a radiation thermometer used for temperature detection of high-temperature objects, Generally, a hood for protecting lenses, mirrors, glass, etc. is attached to the front surface of various devices such as a television camera to withstand high temperatures and enable accurate detection and measurement. Examples of this protective hood include a purge method of supplying air, N ₂ gas, etc. to the inside of the hood, a method of ejecting air from the tip of the hood to form an air curtain on the front surface of the hood, and an air dust-proofing method depending on the shape of the hood. Known are a hood method (see Japanese Patent Publication No. 57-7367, etc.) and a method of circulating water in the hood.

However, in the purging method using air, N ₂ gas, etc., turbulent flow is generated at the hood opening, rather external dust is entrained, and minute dust, water, oil, etc. contained in the purging component itself. Adheres to lenses, mirrors, glass, etc. In the method of forming an air curtain at the tip of the hood, when the object is a high-temperature object, convection occurs in the hood due to the temperature difference between the object and the detector side that is cooling, and the air is exposed to the outside air. There is a problem that air will flow and dust-containing air will enter the hood and stain the lens, mirrors, etc. of the equipment, and dust will adhere to the air jet port for a long time and impair its function. .

On the other hand, the airless hood system is cost-effective because it uses no power source at all to prevent dust, but it has various shapes, so that the effect is not uniform, and the device is directed upward. The dustproof effect is small when used by mounting on. Furthermore, the effect of the hood is great in places where the dust atmosphere is relatively undisturbed, but has no effect in places where dust flow is occurring (for example, dust distribution areas). In addition, the method of circulating water in the hood has the disadvantages that wastewater treatment is required and the equipment cost is high, and that water stains adhere to the lens etc. over a long period of time, which lowers detection and measurement accuracy. ..

Further, a plurality of purge gas supply chambers are provided by a partition plate in the hood main body having a double structure, and fins inclined toward the hood opening are provided on the inner cylinder so as to project from each of the purge gas supply chambers. A multi-stage air purge type dustproof hood has been proposed which has a structure in which the purge gas supplied inside is ejected in a laminar flow. In the case of this dustproof hood, air and N ₂ gas, etc. can be purged in a laminar flow so that turbulent flow does not occur in the hood, so that the entrainment of outside air is prevented and the dustproof effect is great. Have. Further, even if the hood is facing upward, the laminar flow of purge gas can prevent dust from being produced.

[0006]

[Problems to be solved by the device]

The multi-stage air purge type dustproof hood has the excellent performance of being able to eliminate the drawbacks of the conventional purge type hood due to air, N ₂ gas, etc., but it is newly added when actually used in the field. The following problems occurred.

In other words, the dustproof hood has been manufactured so far for dust or water vapor floating in the air. However, in an actual site, in addition to dust and water vapor, dust containing water, water droplets, and so on. Heavy objects such as scales may fall from the material. In addition to the conventional purging hood, the dust prevention hood of the multi-stage air purging method does not consider these dust proofs. There is a drawback in that it is not possible to completely prevent intrusion of the falling dust containing water, heavy drops such as water droplets and scale into the hood.

The present invention cannot completely prevent the intrusion into the hood even with the above-mentioned multi-stage air purge type dust-proof hood, but intrusion of dust containing water, drops such as water drops and scales into the hood from above the hood. The present invention aims to provide a dustproof hood purge device that can prevent the dustproof hood itself from dust and water vapor, and can prevent the detector from becoming dirty and the measurement error from increasing.

[0009]

[Means for Solving the Problems]

 This invention is directed to a wide-angle flat purge nozzle installed close to a dust-proof hood that protects a non-contact type detector and inclined toward the upper part of the dust-proof hood opening at an angle close to a vertical angle, and the wide-angle flat purge nozzle. And a narrow-angle flat purge nozzle that is installed at an appropriate distance from the dust-proof hood to an upper portion of the dust-proof hood and is installed at an angle close to horizontal, and the wide-angle flat purge nozzle and the narrow-angle flat purge nozzle so as not to block the view of the dust-proof hood A gist of a dustproof hood purge device for a detector, which is characterized by comprising a nozzle cover attached above the purge nozzle.

[0010]

[Action]

 The wide-angle flat nozzle was used for the purge nozzle that is installed close to the dustproof hood installed upward and is tilted to an angle near the vertical direction toward the upper part of the dustproof hood because it is close to the dustproof hood. is there. A narrow-angle flat nozzle is used as the purge nozzle that is installed at an appropriate distance from the wide-angle flat purge nozzle and is tilted to a substantially horizontal angle toward the upper part of the dustproof hood opening in order to perform uniform air purge. Is. The angle of inclination of the wide-angle flat purge nozzle and the narrow-angle flat purge nozzle is appropriately determined according to the height and size of the dustproof nozzle. In addition, the nozzle cover is attached above the wide-angle flat purge nozzle and narrow-angle flat purge nozzle so as not to obstruct the view of the dustproof hood. This is to protect the purge nozzle and to allow air purge to be performed on the entire area of the dustproof hood opening.

When dust containing water, water droplets, and heavy objects such as scales fall from the material above the dustproof hood, these are close to the dustproof hood, and are angled almost vertically to the upper part of the dustproof hood opening. The air blown from the wide-angle flat purge nozzle installed at a slant angle is blown almost vertically, and it is tilted at a nearly horizontal angle toward the upper part of the dust hood opening with a proper distance from the wide-angle flat purge nozzle. The air is ejected from the narrow-angle flat purge nozzle that is installed in the air, and is blown further away. Therefore, dust containing water that falls from the material, heavy objects such as water droplets and scales hardly enter the dustproof hood.

[0012]

【Example】

 FIG. 1 is a schematic view showing an example of a dustproof hood purging device according to the present invention, 1 is an H-shaped steel center deviation meter traveling carriage, 2 is a laser distance meter, 3 is a multi-stage air purge dustproof hood, and 4 is a wide-angle flat purge nozzle. 5 is a narrow angle flat purge nozzle, 6 is a nozzle cover, and 7 is an H-section steel.

The H-section steel center deviation meter traveling carriage 1 is installed so as to move in a direction perpendicular to the conveying direction of the H-section steel 7, and the laser rangefinder built in the H-section steel center deviation meter traveling carriage 1 is installed. A multi-stage air purge dustproof hood 3 is installed directly above 2. In this invention, the wide-angle flat purge nozzle 4 is installed near the multi-stage air purge dustproof hood 3 toward the upper part of the dustproof hood opening at a substantially vertical angle, and is further separated from the wide-angle flat purge nozzle 4 by an appropriate distance. The narrow-angle flat purge nozzle 5 is installed so as to be tilted at an angle almost horizontal to the upper part of the opening of the dustproof hood 3. The distance between the dustproof nozzle 3 and the wide-angle flat purge nozzle 4 is usually about 50 to 100 mm, and the distance from the dustproof nozzle 3 to the narrow-angle flat purge nozzle 5 is usually about 300 to 350 mm. The number of wide-angle flat purge nozzles 4 and the number of narrow-angle flat purge nozzles 5 are not particularly limited, but usually about two is sufficient. It goes without saying that the dustproof hood 3 should be wide enough to cover the entire opening.

The nozzle cover 6 is installed on the H-shaped steel center deviation meter traveling carriage 1 so as to cover the wide-angle flat purge nozzle 4 and the narrow-angle flat purge nozzle 5. In this case, it is more effective if the tip of the cover is as close as possible to the dustproof hood 3 within a range that does not obstruct the view of the dustproof hood 3.

In the dustproof hood purging apparatus having the above structure, when heavy particles such as dust containing water, water droplets, scales, etc. fall from the H-shaped steel 7 above the dustproof hood 3, these may come close to the dustproof hood. The wide-angle flat purge nozzle 4 installed blows the air substantially vertically and blows it off in a substantially vertical direction, while the narrow-angle flat purge nozzle 5 blows the air almost horizontally and blows it further away. Therefore, dust containing water, heavy objects such as water droplets and scales falling from the H-section steel 7 hardly enter the dustproof hood 3. Even if the scale blown off by the wide-angle flat purge nozzle 4 falls again, the air jetted from the narrow-angle flat purge nozzle 5 blows it off in a substantially horizontal direction. Will not break into. In addition, the wide-angle flat purge nozzle 4 and the narrow-angle flat purge nozzle 5 are not damaged by heavy objects such as scales falling from above due to the action of the nozzle cover, and the nozzles are clogged with dust or water vapor. Etc. hardly occur.

2A and 2B are explanatory views showing the overall condition of the light receiving lens when the hood purge device shown in FIG. 1 is applied to an actual machine and tested. FIG. 2A is before the test is started, and FIG. The figure shows the scale (iron powder + water) accumulation status after approximately one month. In this embodiment, the inclination angles of the wide-angle flat purge nozzle 4 and the narrow-angle flat purge nozzle 5 are set to 70 degrees and 30 degrees, respectively.

As a result, the scale was conventionally deposited in one day, and the laser light of the laser range finder did not reach the light receiving part, which made measurement impossible. With only some accumulation (see Fig. 2B), it was able to operate without maintenance for more than a month.

[0018]

[Effect of the device]

 As described above, according to the present invention, the purge nozzle installed so as to be inclined at a nearly vertical angle toward the upper part of the opening of the dustproof hood installed upward and the substantially horizontal position toward the upper part of the dustproof hood opening. The upper part of the dustproof hood can be purged by the air blown from the purge nozzle installed at an angle close to, so that dust containing water, heavy drops such as water droplets and scale fall from the material above the dustproof hood. Even if it happens, these rarely enter the dustproof hood. For example, when the dustproof hood is the multi-stage air purge system, an excellent dustproof effect is obtained in combination with the effect of the dustproof hood. Further, since the purge nozzle is protected by the action of the nozzle cover, stable purge is always possible. Therefore, it is possible to perform various detections from the bottom of the line in hot and bad environments (dust, water, scale, etc.) in hot rolling mills, which was difficult in the past, and to detect and measure the accuracy of various detectors. It has a great effect that the accuracy can be maintained for a long time.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of a dustproof hood purge device according to the present invention.

FIG. 2A is an explanatory diagram showing a situation before the test of the light receiving lens of the laser rangefinder according to the embodiment of the present invention is started.

FIG. 2B is an explanatory diagram showing a situation of the light receiving lens in the above-described embodiment after a lapse of about one month.

[Explanation of symbols]

 1 H-shaped steel center deviation meter traveling trolley 2 Laser distance meter 3 Multi-stage air purge dustproof hood 4 Wide-angle flat purge nozzle 5 Narrow-angle flat purge nozzle 6 Nozzle cover 7 H-shaped steel

Claims (1)

[Scope of utility model registration request] 1. A wide-angle flat purge nozzle installed close to a dust-proof hood for protecting a non-contact type detector and inclined toward the upper part of the dust-proof hood opening at an angle close to a vertical angle, and the wide-angle flat purge nozzle. A narrow-angle flat purge nozzle installed at an appropriate distance to the upper part of the dust-proof hood and tilted at a nearly horizontal angle, and the wide-angle flat purge nozzle and narrow-angle flat purge so as not to obstruct the view of the dust-proof hood. A dustproof hood purge device for a detector, comprising a nozzle cover attached above the nozzle.