JP2564149Y2 - Dust-proof hood purge device for detector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air purge device on a dust-proof hood for preventing minute dust from adhering to lenses, mirrors, and glass of optical devices such as various detectors.

[0002]

2. Description of the Related Art Various optical devices installed in a bad environment where dust, water vapor, etc. are generated, such as a transfer line for high-temperature steel, etc., for example, a photoelectric detector for detecting a position of a steel, and a temperature detector for a high-temperature object. For various imaging devices such as radiation thermometers and television cameras, it is necessary to attach a hood to protect the lens, mirror, glass, etc. on the front of the device so that it can withstand high temperatures and perform accurate detection and measurement. General. As this protective hood, for example, air, N
₍₂₎ A purge method for supplying gas, etc., a method in which air is blown from the tip of the hood to form an air curtain on the front of the hood, and an airless hood method for preventing dust by the shape of the hood (see Japanese Patent Publication No. 57-7367, etc.) ), A method of circulating water in a hood and the like are known.

However, in the purging method using air, N ₂ gas or the like, a turbulent flow is generated at the hood opening, and consequently, external dust is entrained, and minute dust, moisture, oil, etc. contained in the purge component itself. Adheres to lenses, mirrors, glass and the like. 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 a temperature difference between the object and the cooling side of the detector, and the circulation with the outside air occurs. As a result, there is a problem that air containing dust enters the hood and contaminates a lens, a mirror, and the like of the device, and furthermore, dust adheres to the air jet port due to long-term use, and the function may be impaired.

[0004] On the other hand, the airless hood system has an advantage in terms of cost because dust is prevented without using any power source, but since it has various shapes, its effects are not only uneven, but also the equipment is turned upward. When used by mounting on a small surface, the dustproof effect is small. Further, the effect of the hood is great in a place where the dust atmosphere is relatively undisturbed, but has no effect in a place where dust flows (for example, a dust distribution area). The method of circulating water in the hood is
There is a drawback that wastewater treatment is required, which increases equipment costs, and that water and dirt adhere to lenses and the like over a long period of use, thereby lowering detection and measurement accuracy.

Further, a plurality of purge gas supply chambers are provided by a partition plate in a hood body having a double structure, and fins which are inclined toward the hood opening are provided on the inner cylinder for each of the purge gas supply chambers. There has been proposed a multi-stage air purge type dustproof hood having a structure in which a purge gas supplied into the inside is ejected in a laminar flow. For this dustproof hood, it is possible to purge with air as turbulence does not occur in a hood, a N ₂ gas or the like in laminar flow, the outside air entrainment is prevented, it has the advantage that dustproof effect is large . Also,
Even if the direction of the hood is upward, there is an excellent effect that dust can be prevented by the laminar flow purge gas.

[0006]

Dustproof hood of the multi-stage air purge system A devised to solve the above-above-described conventional air, have excellent performance in that it is possible to overcome the disadvantages of the purge system hood according N ₂ gas or the like, the actual The following new problems have arisen when used in the field.

In other words, dust hoods have been manufactured for dust or water vapor floating in the air. However, in actual practice, dust, water droplets and scales containing water in addition to dust and water vapor are used. Etc. may fall from the material. In addition to the conventional purging method hood, the dust hood of the multi-stage air purge system does not consider these dust proofs, so even if this multi-stage air purge hood is installed and used upward, it will fall from the material. There is a drawback in that it is not possible to completely prevent intrusion of the heavy substances such as the dust containing water, water droplets, scales, etc. into the hood.

[0008] This invention is intended to prevent the intrusion into the hood of dust, water droplets and scales containing water from above the hood, which cannot completely prevent the intrusion into the hood even with the above-mentioned multi-stage air purge type dustproof hood. It is an object of the present invention to provide a dust-proof hood purging device capable of preventing the dust and the water vapor of the dust-proof hood itself from being stained, and preventing the detector from becoming dirty and an increase in measurement error.

[0009]

SUMMARY OF THE INVENTION The present invention is directed to a wide-angle flat purge nozzle which is installed near a dust-proof hood for protecting a non-contact type detector and is inclined at a substantially vertical angle toward an upper portion of the dust-proof hood opening. A narrow-angle flat purge nozzle which is installed at an appropriate distance from the wide-angle flat purge nozzle toward the upper part of the dust-proof hood opening and is inclined at a substantially horizontal angle; and the wide-angle flat purge nozzle is arranged so as not to obstruct the view of the dust-proof hood. The gist of the present invention is a dust-proof hood purge device for a detector, comprising a flat purge nozzle and a nozzle cover provided above the narrow-angle flat purge nozzle.

[0010]

The wide-angle flat nozzle is used for the purge nozzle which is installed near the dustproof hood which is installed upward and is inclined at an almost vertical angle toward the upper part of the dustproof hood opening. Because it is near. Also, the reason why the narrow-angle flat nozzle is used as the purge nozzle that is installed at a suitable distance from the wide-angle flat purge nozzle toward the upper part of the opening of the dustproof hood and that is inclined substantially at an angle is to perform uniform air purging. is there. The angle of inclination between 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. The nozzle cover is provided above the wide-angle flat purge nozzle and the narrow-angle flat purge nozzle so as not to obstruct the view of the dust-proof hood. This is for the purpose of protection and to enable air purging to be performed over the entire area of the dustproof hood opening.

When heavy objects such as water-containing dust, water droplets, and scales fall from the material above the dust-proof hood, they are inclined near the vertical at an angle substantially perpendicular to the dust-proof hood opening near the dust-proof hood. The air blown from the wide-angle flat purge nozzle installed is blown off in a substantially vertical direction, and is installed at an appropriate distance from the wide-angle flat purge nozzle toward the upper part of the dust-proof hood opening at an angle that is almost horizontal. The air is blown further from the narrow-angle flat purge nozzle. Accordingly, it is almost impossible for heavy substances such as dust, water droplets, scales, etc., containing water falling from the material to enter the dustproof hood.

[0012]

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

The H-shaped steel center deviation meter traveling cart 1 is installed so as to move in a direction perpendicular to the direction of transport of the H-shaped steel 7,
A multi-stage air-purging dust-proof hood 3 is installed directly above a laser distance meter 2 built in the H-shaped steel center deviation meter traveling cart 1. In this invention, a wide-angle flat purge nozzle 4 is installed near the above-mentioned multi-stage air purge dust-proof hood 3 at an almost vertical angle toward the upper part of the dust-proof hood opening, and furthermore, at an appropriate distance from the wide-angle flat purge nozzle 4. Then, the narrow-angle flat purge nozzle 5 is installed so as to be inclined at a substantially horizontal angle toward the upper portion 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 300 to 350.
mm. The number of nozzles of the wide-angle flat purge nozzle 4 and the narrow-angle flat purge nozzle 5 is as follows.
Although there is no particular limitation, usually about two are sufficient. In any case, it is needless to say that the dustproof hood 3 is provided with a spread capable of covering the entire opening.

The nozzle cover 6 covers the wide-angle flat purge nozzle 4 and the narrow-angle flat purge nozzle 5 with H
It is installed on the traveling trolley 1 for the center deviation meter of the section steel. In this case, it is more effective that the tip of the cover does not obstruct the field of view of the dustproof hood 3 and is as close to the dustproof hood 3 as possible.

In the dustproof hood purging apparatus having the above structure, if heavy matter such as water-containing dust, water droplets or scales falls from the H-shaped steel 7 above the dustproof hood 3, these are installed close to the dustproof hood. The air blown almost vertically from the wide-angle flat purge nozzle 4 blows out almost vertically, and the air blown almost horizontally from the narrow-angle flat purge nozzle 5 blows farther. Accordingly, heavy substances such as dust, water droplets, scales, etc. containing water falling from the H-shaped steel 7 hardly enter the dustproof hood 3. Also,
Even if the scale etc. blown off by the wide-angle flat purge nozzle 4 may fall again,
Since the air blown from the narrow-angle flat purge nozzle 5 blows out in a substantially horizontal direction, the air does not enter the dustproof hood 3. Also, a wide-angle flat purge nozzle 4
The narrow-angle flat purge nozzle 5 is not damaged by a heavy object such as a scale falling from above due to the function of the nozzle cover, and hardly causes nozzle clogging due to dust or water vapor.

FIGS. 2A and 2B are explanatory diagrams showing the overall situation of the light receiving lens when a test is performed by applying the hood purge device shown in FIG. 1 to an actual machine. FIG. This shows the scale (iron powder + water) accumulation status after one month has passed. 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 is conventionally deposited in one day,
The laser beam from the laser rangefinder did not reach the light-receiving part, making it impossible to measure. However, only a little scale accumulation in the light-receiving lens occurred after about one month (see Fig. 2B). It can be operated without maintenance.

[0018]

As described above, according to the present invention, a purge nozzle installed at an angle close to substantially vertical toward the upper part of the opening of the dustproof hood installed upward, and the purge nozzle installed at the upper part of the opening of the dustproof hood are installed. The upper opening of the dustproof hood can be purged by air injected from the purge nozzle installed at an angle close to the horizontal.
Even if heavy objects such as water-containing dust, water droplets, and scales fall from the material above the dust-proof hood, they hardly enter the dust-proof hood.For example, when the dust-proof hood is the multi-stage air purge method, , An excellent dustproof effect is obtained in combination with the effect of the dustproof hood. Further, since the purge nozzle is protected by the function of the nozzle cover, a stable purge can always be performed. Therefore, it is possible to perform various detections from the lower part of the line in hot and bad environments (dust, water, scale, etc.) such as hot rolling mills, which was difficult in the past, and the detection accuracy and measurement accuracy of various detectors Can be maintained over a long period of time.

[Brief description of the drawings]

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

FIG. 2A is an explanatory diagram showing a state before a test of a light receiving lens of the laser distance meter in the embodiment of the present invention is started.

FIG. 2B is an explanatory diagram showing a state of the light receiving lens in the embodiment after about one month has elapsed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 H-shaped steel center deviation meter traveling cart 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)

(57) [Scope of request for utility model registration] 1. A wide-angle flat purge nozzle which is provided near a dust-proof hood for protecting a non-contact type detector and is inclined at an angle substantially perpendicular to an upper portion of an opening of the dust-proof hood; A narrow-angle flat purge nozzle that is installed at an appropriate distance from the dust-proof hood opening at an angle close to substantially horizontal toward the upper part thereof, and the wide-angle flat purge nozzle and the narrow-angle flat purge that do not obstruct the view of the dust-proof hood. A dust-proof hood purging device for a detector, comprising: a nozzle cover provided above a nozzle.