JPS596404Y2 - Light detection measuring device Measuring window automatic cleaning device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a measuring device for measuring, for example, the diameter of a wire or the width of a plate 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 from 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 points mentioned above, and its purpose was to blow compressed air above the glass surface and blow some of the compressed air in the opposite direction by blowing back. An object of the present invention is to provide an automatic cleaning device for a measurement window of a photodetection and measurement device, which prevents dust from being sucked in and adhering to a glass surface.

Another object of this invention is to provide an automatic cleaning device for a measurement window of a photodetection and measurement device, which uses a wiper device to periodically remove dust and the like adhering to the glass surface.

Another purpose of this invention is to automatically apply cleaning liquid to the wiper blade during its reciprocating motion to more completely remove dust from the glass surface. To provide cleaning equipment.

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)
A wiper device 3, a cleaning liquid application device 4, and a glass 5 are installed inside the dustproof cover.

The glass 5 is arranged on the optical axis of the light receiving element in the casing 1, placed on a window bored in the casing 1 via a packing 51 made of rubber or the like, and fixed by a 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.
7 is connected.

Therefore, as the air cylinder 37 operates, the wire 3
5 moves and the holding frame 32 moves back and forth, so the blade 3
4 reciprocates on 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 this frame 43 has a longitudinal dimension slightly longer than that of the case 41, when it is fitted into the case 41, the central portion also has a raised shape.

Therefore, the central portion of the impregnating material 42 rises above the case 41, so that when the blade 34 described above passes, its tip comes into contact with the impregnating material 42, so that the cleaning liquid adheres to the tip of the blade 34.

As the cleaning liquid, a less volatile one such as glycerin is preferable.

The above is a device for removing dust and the like adhering to the front surface of the glass 5.

The structure of the compressed air blowing device 6 for preventing dust and the like from adhering to the glass 5 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 61 a and 6
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 61b is
The compressed air is discharged to the window 23 of the case 2 via the blowback 22 of the case 2.

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, this device automatically or artificially closes the valve (
(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 etc. will not be sucked through the window, so the glass surface can be constantly cleaned, and even if dust adheres to the glass surface, the wiper blade can be moved back and forth. This removes dust, etc. adhering to the glass surface, so work can be done automatically or manually from a remote location, improving work efficiency and ensuring safety. Since the cleaning liquid is automatically applied to the glass surface, dust and the like adhering to the glass surface can be completely removed by this cleaning liquid, and accurate measurements without errors can be performed.

[Brief explanation of the drawing]

The figures show an embodiment of the automatic cleaning device for the measurement window of a photodetection and measurement device according to this invention, in which FIG. 1 is a side view of the entire measuring device, FIG. 4 is a sectional side view of the wiper device, FIG. 5 is an exploded perspective view of the cleaning liquid application device, and FIG. 6 is a sectional side view of the compressed air blowing device. 3... Wiper device, 34... Wiper blade, 4... Cleaning liquid application device,
42... Impregnation material, 5... Glass.

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. It is equipped with a folded tube that blows out compressed air into the window of the case, and further includes a wiper blade that reciprocates on the glass surface and removes dust attached to the glass surface (. An automatic cleaning device for a measurement window of a light detection measurement device, comprising a cleaning liquid application device for applying a cleaning liquid to the tip of the device.