JPS596405Y2 - Light detection measurement device Dust prevention device for measurement window - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a measuring device for measuring, for example, the diameter of a wire rod or the width of a plate material by detecting light emitted by the object to be measured or light from a projector.

Since this type of measuring device uses a silicon phototransistor or the like as a light receiving element, a glass is placed at the entrance of the optical path to prevent dust from adhering to the light receiving element.

Conventionally, an operator has to periodically clean dust and the like adhering to the glass, but this work is difficult and dangerous while the heating material is passing through the glass.

This idea was developed in view of the above points, and its purpose is to measure a light detection and measurement device that blows compressed air above the glass surface to prevent dust from adhering to the glass surface. The present invention provides a dustproof device for windows.

Another function of this device is that a part of the compressed air is blown in the opposite direction by blowback, which prevents dust from being sucked in due to entrainment, and prevents dust from entering the glass surface. It is an object of the present invention to provide a dustproof device for a measurement window of a photodetection and measurement device, which more effectively prevents dust and the like from adhering to the measurement window of a photodetection and measurement device.

Next, an embodiment of this invention will be described with reference to the drawings.

Reference numeral 1 denotes a casing in which a light receiving element and an electronic circuit are housed.

2 is the measurement surface side of the case 1 (right side in Fig. 1)
The measurement window glass 5 (see FIG. 6) is placed on the optical axis of the light-receiving element in the casing 1, and a packing 51 made of rubber or the like is attached to the window bored in the casing 1. It is placed through the frame plate 52 and fixed by the frame plate 52.

Next, to explain the details of the wiper device 3, the casing 1
Two guide plates 31 are fixed to the holding frame 32, and a holding frame 32 is slidably guided thereon by rollers 32a.

A blade holder 33 is fixed to the tip of the holding frame 32, and a wiper blade 34 made of rubber or the like is fixed to the holder 33 by a mounting plate 33a (see FIG. 3).

A flexible wire 35 is connected to the rear end of the blade holder 33 by a connector 35a, and the wire 35 is inserted into a tube 36 fixed by a fixture 36a.

The other end of the tube 36 is fixed to a fixture 36b on the side of the casing 1, and the other end of the wire 35 is attached to the air cylinder 3, which is also fixed to the side of the casing 1.
It is tied to 7.

Therefore, as the air cylinder 37 operates, the wire 3
5 moves and the holding frame 32 is assembled back and forth, so the blade 3
4 reciprocates the upper surface of the glass 5 to remove dust and the like.

Next, to explain the details of the cleaning liquid application device 4, a case 41 having flanges 41a on both sides is fixed to the casing 1 behind the glass 5.

Then, an impregnating material 42 such as a sponge is housed in the case 41, and an elastic frame 43 is fitted into the case 41.

Since the frame 43 is formed to have a longitudinal dimension slightly longer than that of the case 41, when it is fitted into the case 41, the frame 43 assumes an upwardly shaped central portion.

Therefore, since the central portion of the impregnating material 42 rises above the case 41, the tip thereof comes into contact with the impregnating material 42 when the blade 34 passes therethrough, thereby causing the Kunoninda liquid to adhere to the tip of the blade 34.

As for the cleaning liquid, a less volatile one such as glycerin is preferable.The above is a device for removing dust etc. adhering to the front surface of the glass 5, but in order to prevent dust etc. from adhering to the glass 5. The structure of the compressed air blowing device 6 will be explained.

Reference numeral 61 denotes a nozzle, which is fixed to the above-mentioned casing 1 at the portion where the glass 5 is attached.

The case 2 is open on the side opposite to where the nozzle 61 is attached, and a blow-back 22 is provided in a half portion from the opening 21.

Further, a window 23 is bored in a portion of the case 2 that corresponds to the glass 5.

On the other hand, the nozzle 61 described above has two discharge ports 61a and 61.
The compressed air from the discharge port 61a is discharged from the opening 21 of the case 2, and the compressed air from the discharge port 6lb is discharged to the window 23 of the case 2 through the blow-back 22 of the case 2. be done.

Note that the nozzle 61 is connected to a compressor (not shown) via a pipe 62.

Next, to explain the operation based on the above-mentioned precautions, first, compressed air is constantly supplied to the nozzle 61 via the pipe 62, so a part of the compressed air is blown out from the discharge port 61a and the dustproof cover 2 The dust that has entered the interior is blown away to prevent it from adhering to the glass 5.

Here, the air flow blown out from the discharge port 61a creates a negative pressure inside the case 2, and the dust floating around the window 23 of the case 2 is sucked out. The compressed air from 61b is turned back at the blowback 22 and blown out to the front of the window 23.

Therefore, dust floating around the window 23 is blown away by the compressed air and does not enter the case 2.

This makes it possible to prevent dust from adhering to the glass 5 as much as possible.

Even if this is done, when dust etc. adheres to the glass 5, the device automatically or artificially closes the valve at regular intervals.
(not shown) is opened to supply compressed air to the air cylinder 37.

As a result, the flexible wire 36 is pushed out and the blade 34 moves forward to clean the surface of the glass 5.

At this time, the tip of the blade 34 moves forward while contacting the impregnating material 42, so that the cleaning liquid adheres to the tip of the blade 34 and cleans the surface of the glass 5.

Therefore, dust etc. adhering to the glass 5 can be completely wiped off.

If you repeat this operation several times and close the valve,
Glass 5 is completely cleaned.

Note that in the above-described embodiment, the movement of the blade 34 is not limited to the air cylinder, but may be caused by other driving sources,
For example, it is of course possible to use a motor, a plunger, etc.

As mentioned above, this idea blows compressed air from a nozzle onto the glass surface to prevent dust from adhering to the glass surface, keeping the glass surface clean for a long time, and
A part of the compressed air from the nozzle is blown back to blow away dust floating around the case window.
Even if the inside of the case becomes negative pressure, dust and the like will not be sucked through the window, and therefore the glass surface can be constantly cleaned.

[Brief explanation of drawings]

The figures show an embodiment of the dust-proofing device for the measurement window of the light detection and measurement device according to this invention.
The figure is a side view of the main parts, Figure 3 is a bottom view of the same as above, Figure 4 is a cross-sectional side view of the wiper device, Figure 5 is an exploded perspective view of the cleaning liquid application device, and Figure 6 is the compressed air blowing device. FIG. 2...Case, 22...Blowback, 23
...Window, 5...Glass, 6...
- Compressed air blowing device, 61...nozzle.

Claims (1)

[Scope of utility model registration request] A measurement window glass that transmits light from the object to be measured and light from behind the measurement object, a nozzle arranged on the side of the glass, and a part of the compressed air from the nozzle is turned back to correspond to the glass. A dustproof device for a measurement window of a light detection and measurement device, comprising a folded tube that blows out compressed air into a window of a case.