JPH09136049A - Apparatus for detecting clogging of liquid spraying nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the clogging of a liquid spraying nozzle properly for a long duration. SOLUTION: A detecting plate 24 of a detecting member 22 is counterposed a spraying hole 9 of a liquid spraying nozzle 8 at a prescribed distance D. A guide cylinder 44 is installed between the detecting plate 24 and the spraying hole 9. A detection arm 34 is attached to the detecting member 22 in the way the arm can rotate freely. A sensor 40 is installed at a position out of the spraying path of a sprayed liquid. After passing the guide cylinder 44, the sprayed liquid comes collision against the detecting plate 24, so that the detecting plate 2 rotates and moves and consequently the detection arm 34 moves back and forth. the movement of the detection arm 34 is detected by the sensor 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting clogging of an injection hole of a liquid injection nozzle for ejecting an injection liquid such as water or oil.

[0002]

2. Description of the Related Art Generally, in a liquid jet nozzle used for cooling or washing, if the jet holes are clogged, problems such as insufficient cooling or washing occur. Therefore, for example, Japanese Patent Application Laid-Open No. 58-98156 discloses that the clogging is detected early by detecting the negative pressure in the vicinity of the injection port of the nozzle. In addition, JP-A-4-210812
In the publication, as shown in FIG. 4, a fixed base 4 on which a sensor 3 is arranged is moved in parallel with a group of nozzles 2 along a sensor moving rail 5 to measure the temperature or pressure of the ejected liquid, and from the measured value, It has been proposed to detect clogging at an early stage.

[0003]

However, in the one disclosed in Japanese Patent Laid-Open No. 58-98156, the pressure around the injection port varies among products due to, for example, manufacturing error of each nozzle. Unable to determine clogging. Further, such a configuration cannot be applied to, for example, a liquid ejection nozzle having a plurality of ejection holes formed in the circumferential direction. In the case of Japanese Patent Laid-Open No. 4-210812,
Since the ejected liquid is detected by directly contacting the sensor,
Failure of the sensor due to infiltration of the jetted liquid is likely to occur, resulting in an increase in maintenance man-hours, and there is still a problem in terms of durability and long life of the sensor.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a device for detecting clogging of a liquid ejecting nozzle, which can accurately detect clogging of the liquid ejecting nozzle for a long period of time.

[0005]

In order to solve the above problems, a device for detecting clogging of a liquid jet nozzle according to the present invention is provided.
A device for detecting clogging of a jetting hole of a liquid jetting nozzle, which is arranged to face the jetting hole with a predetermined gap, and which moves when a jetting liquid jetted from the jetting hole comes into contact with the detection plate. It is characterized in that it is provided at a position deviated from the ejection path and has a sensor for detecting the movement of the detection plate.

That is, since the ejection liquid ejected from the ejection holes is brought into contact with the detection plate and the clogging of the liquid ejection nozzle is detected based on the movement of the detection plate, the manufacturing error of the liquid ejection nozzle is concerned. It is possible to accurately detect clogging. Further, since the electric sensor is arranged at a position deviated from the jetting path of the jetted liquid, the jetted liquid does not scatter to the sensor and can be used stably for a long time.

Desirably, a guide cylinder is provided between the jet hole of the liquid jet nozzle and the detection plate, and by this guide cylinder, dispersion (diffusion) of the jet liquid jetted from the jet hole is restricted so that the jet liquid is discharged. It is regulated so that the direction of the detection plate is surely oriented. As a result, even if the jet liquid is once dispersed,
Since the dispersion is limited by the guide effect of the guide cylinder and the dispersion tends to converge and then contacts the detection plate, for example, in the case where the injection liquid tends to be dispersed and is not seriously clogged, the injection hole It is possible to prevent an erroneous determination that the is clogged. That is, by providing a predetermined guide tube, a desired determination result can be obtained.

Further, the clogging detection device of the present invention can be applied to, for example, a liquid jet nozzle having a plurality of jet holes formed along the circumferential direction and rotating around an axis.

More specifically, the clogging detection device of the present invention is fixed to the base end portion of the detection plate, and a link that rotates together with the detection plate when the ejected liquid comes into contact with the link is rotatable. And a detection arm that moves forward and backward according to the rotational movement of the detection plate. As the sensor, for example, it is arranged near the tip of the detection arm,
A photoelectric sensor that detects the advance / retreat of the detection arm is used.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a clogging detection device for a liquid jet nozzle according to this embodiment. The device 10 is configured so that the sensor 40 detects the state of the ejected liquid ejected from the ejection holes 9 of the liquid ejection nozzle 8 as an electrical signal. The liquid jet nozzle 8 used here is driven to rotate about an axis, and at the tip end thereof, jet holes 9 are arranged so as to face each other along the circumferential direction.
It has been drilled in place. By the rotation of the liquid ejecting nozzle 8, the ejecting ejecting liquid is ejected radially from the two ejection holes 9.

The detection device 10 of this embodiment includes an L-shaped detection member 22 rotatably fixed to a mounting frame 12, and a detection arm 3 rotatably connected to the detection member 22.
4 and a non-contact type sensor 40 provided near the tip of the detection arm 34.

The detection member 22 includes a detection plate 24 and a link 26.
And are integrally fixed in an L shape. Detection plate 2
4 is arranged so that the lower surface 24c at the tip 24a thereof faces the injection hole 9 substantially vertically with a predetermined gap D, and the two screws 2 are provided at the base end 24b.
It is fixed to the link 26 by 8. Link 26 is
It is attached so as to stand vertically with respect to the detection plate 24.

The detecting member 22 constructed as described above is mounted on the support member 30 fixed to the mounting frame 12 around the shaft 32 (see FIG. 1).
Is rotatably supported in the direction of arrow P). In the detection member 22, the pin 23 formed on the link 26 is attached to the mounting frame 1
By contacting the stopper bolt 13 attached to the position 2 of FIG. 2, the detection plate 24 becomes a horizontal position (see FIG. 1).
Is held at the position indicated by the solid line), and the liquid ejected from the ejection hole 9 comes into contact with the detection plate 24, whereby the liquid is rotated upward as indicated by the phantom line in FIG.
The steady position of the detection member 22 can be adjusted by adjusting the protrusion amount of the stopper bolt 13 with the adjustment nut 13a.

In the mounting frame 12, a case 14 for protecting the sensor 40 and the like from jetted liquid and the like, and a support frame 16 extending in the horizontal direction from the mounting frame 12 in the case 14, a detection member 22 and an injection hole 9. It is fixed on the opposite surface. A detection arm support member 18 that supports the detection arm 34 and a sensor support member 20 that supports the sensor 40 are fixed to the upper surface of the support frame 16.

The detection arm 34 has a tip 26 of the link 26.
It is rotatably attached to the arm shaft 36 at b. The detection arm 34 has a hole 1 formed in the mounting frame 12.
2a is loosely penetrated and protrudes into the case 14, and penetrates the hole 18a of the detection arm support member 18 so as to be able to move forward and backward. That is, the detection arm 34 extends parallel to the support frame 16 and is linearly supported in the longitudinal direction thereof so as to be movable back and forth, and is movable forward and backward in accordance with the rotational movement of the detection member 22.

The shaft 32 functioning as the center of rotation of the detection member 22 is set at a position extremely close to the base end 26a side of the link 26, and the base end 26a to which the detection plate 24 is attached is rotationally displaced. In contrast, the tip 26 of the link 26
The rotational displacement in b, that is, the movement displacement of the detection arm 34 is enlarged. This makes it easy to detect the minute rotational displacement of the detection member 22.

A spring 38 is provided between the end surface of the large-diameter portion 34b of the detection arm 34 and the detection arm support member 18, and the spring 38 constantly urges the detection arm 34 to the right in FIG. As a result, the detection member 22 is always urged toward the steady position.

A guide cylinder 44 is provided in the gap D between the detection plate 24 of the detection member 22 and the liquid jet nozzle 8.
The guide cylinder 44 includes the guide cylinder support frame 4 fixed to the mounting frame 12.
6, the lower end of the guide cylinder 44 is opened at a position separated from the injection hole 9 of the liquid injection nozzle 8 with a predetermined gap d. The ejected liquid is the inner wall surface 44 of the guide cylinder 44.
The diffusion is restricted by a, and the ejection path is regulated so that the ejection liquid efficiently contacts the predetermined position of the detection plate 24.

At the time of detecting clogging, the jetted liquid is jetted radially from the jet holes 9 as the liquid jet nozzle 8 rotates. When the ejection hole 9 is rotated to a position substantially opposite to the detection plate 24, the ejection liquid from the ejection hole 9 enters the guide cylinder 44, is discharged from the other end of the guide cylinder 44, and abuts on the detection plate 24. . At this time, when the ejected liquid is narrowed down and its convergence directivity is strong, it directly abuts on the detection plate 24 without touching the inner wall surface 44a of the guide cylinder 44, but tends to be dispersed (diffused) toward the outside. Liquid to be sprayed is also a guide tube 4
Due to the guiding effect of the inner wall surface 44a of No. 4, the path is regulated as described above, and is discharged from the other end.
Abut. The detection plate 24 is rotationally displaced around the shaft 32 in accordance with the pressure of the ejected liquid at this time, whereby the detection arm 34 moves back and forth. The moved detection arm 34 and the detection member 22 quickly return to the steady position by the spring force of the spring 38 and the like.

The sensor 40 is fixed to the support member 20,
It is provided at least at a position deviated from the direction in which the liquid ejected from the ejection holes 9 is directed. As shown in FIG. 2, the sensor 40 is substantially U-shaped in a side view, and has a space 42 that opens downward. The above-mentioned detection arm 34 is located on a horizontal extension line of the space 42, and the detection arm 34 is moved in accordance with the forward / backward movement of the detection arm 34.
Tip 34a enters or leaves the space 42.

In this embodiment, a transmissive photoelectric sensor is used as the sensor 40, and as is well known, the space 4
A light emitting element and a light receiving element are arranged facing each other along the optical axis X on both sides of the element 2. And the detection member 2
In the state where 2 is in the steady position shown by the solid line in FIG. 1, the tip 34a of the detection arm 34 has not reached the position blocking the optical axis between the light emitting element and the light receiving element, and the output signal of the sensor 40 is OFF. On the other hand, when the detection member 22 is rotationally displaced to the position shown by the phantom line in FIG.
Since it penetrates deeply inside and blocks the optical axis, the sensor 40
The output signal of turns ON. ON from these sensors 40
The -OFF signal is input to the control unit 50. That is, in this embodiment, the clogging of the ejection hole 9 of the liquid ejection nozzle 8 is determined and detected depending on whether or not the detection arm 34 has reached the optical axis X.

In the control unit 50, a normal ON-OFF signal generation pattern synchronized with the rotational movement when the liquid is actually jetted while the favorable jet nozzle 8 without clogging is rotated in advance is a data table. Is stored in advance as O and is transmitted from the table and the detection device 10.
By comparing with the N-OFF signal, the clogging of each ejection hole 9 of the liquid ejection nozzle 8 can be detected early. That is, the control unit 50 determines whether or not any or all of the injection holes 9 are in the clogging state by comparing and determining the intervals of ON-OFF signals of the table and the detection device 10.

As described above, in the clogging detection device 10 of the present embodiment, the detection plate 24 is arranged so as to face the injection hole 9 with a predetermined gap, and the detection liquid is detected by the contact of the liquid ejected from the injection hole 9. Since the sensor 24 is configured to detect the movement of the detection arm 34 in response to the rotational movement of the detection plate 24 by the sensor 40, the eye of the liquid ejection nozzle 8 can be accurately adjusted regardless of manufacturing error of the liquid ejection nozzle. Can detect clogging. Further, since the electrical sensor 40 is arranged at a position deviated from the jetting path of the jetted liquid, the sensor 40 can be surely protected from the jetted liquid or the like which causes a failure, and thus the apparatus main body is stable for a long term. Can be used.

FIG. 3 shows the results of a comparative experiment on the stroke amount of the detection arm 34 in the detection device 10.

In the figure, the nozzle A is a liquid jet nozzle having a good jet hole without clogging, and the nozzle B is not a serious clogging, but the jet liquid tends to be ejected relatively dispersedly. Is a liquid injection nozzle in. The code B
1, B2 and B3 represent stroke amounts of the detection arm when the nozzle B is used, and when no guide cylinder is provided, when a 3/4 steel pipe guide cylinder is provided,
The experimental result when the guide tube of 1/2 steel pipe is provided is shown.

In the clogging detection device 10, the tip of the detection arm 34 and the sensor 40 at the steady position are detected on the basis of the movement displacement (steady stroke) of the detection arm 34 when the nozzle A is detected without the guide cylinder. The distance between the optical axis and the optical axis is set. That is, the detection arm 34
The clogging of the injection hole 9 is determined based on whether or not the stroke has reached the steady stroke.

In the nozzle B, the stroke when the guide cylinder is not provided has not reached the steady stroke, and in this case, even if the liquid is actually jetted from the jet hole 9, the jet hole 9 is clogged. Is erroneously determined to be on the other hand,
In the case of using a 1/2 steel tube or 3/4 steel tube guide cylinder, the dispersed liquid sprayed is restricted to the outside due to the guiding effect of the inner wall surface of the guide cylinder, and is concentrated and directed. As a result, most of the ejected liquid comes into contact with the detection plate 24, so that a stroke amount of approximately a steady stroke or more can be obtained, and there is no erroneous determination as described above.

Further, here, by using the guide tube of 3/4 steel pipe that can obtain a value close to the steady stroke, even if the nozzle B has a tendency to be dispersed, a stroke close to the steady stroke can be obtained. Therefore, a more accurate detection result can be obtained.

[0029]

As described above, in the clogging detection device for a liquid jet nozzle according to the present invention, the detection member moves due to the contact of the jetted liquid jetted from the jet hole, and the detection according to the movement of the detection member. Since the sensor detects mechanical movement of the arm or the like, it is possible to accurately detect clogging regardless of manufacturing error of the liquid ejection nozzle.

Further, since the electric sensor is arranged at a position deviated from the jetting path of the jetted liquid, the jetted liquid is not jetted to the sensor and can be used stably for a long period of time.

[Brief description of the drawings]

FIG. 1 is a diagram showing a clogging detection device for a liquid ejection nozzle according to an embodiment of the present invention.

FIG. 2 is a front view of the clogging detection device of FIG. 1 viewed from the direction of arrow II.

FIG. 3 is a result of a comparative experiment of stroke amounts of detection arms.

FIG. 4 is a diagram showing a conventional clogging detection device.

[Explanation of symbols]

 8 ... Liquid injection nozzle 9 ... Injection hole 10 ... Detection device 22 ... Detection member 24 ... Detection plate 26 ... Link 34 ... Detection arm 40 ... Sensor 44 ... Guide tube

Claims (4)

[Claims] 1. A device for detecting clogging of an injection hole of a liquid injection nozzle, wherein the device is arranged so as to face the injection hole with a predetermined gap, and moves when an injection liquid ejected from the injection hole comes into contact therewith. A clogging detection device for a liquid ejection nozzle, comprising: a detection plate; and a sensor arranged at a position deviated from the ejection path of the ejection liquid, the sensor detecting movement of the detection plate. 2. The liquid ejecting nozzle is provided between an ejection hole and the detection plate, restricts dispersion of the ejection liquid ejected from the ejection hole, and contacts a path of the ejection liquid with the detection plate. The clogging detection device for a liquid ejection nozzle according to claim 1, further comprising a guide tube that regulates the above. 3. The liquid ejection nozzle according to claim 1, wherein a plurality of the ejection holes are formed along a circumferential direction of the liquid ejection nozzle, and the liquid ejection nozzle rotates about an axis. A device for detecting clogging of a liquid jet nozzle. 4. A link fixed to a base end portion of the detection plate and rotationally moved together with the detection plate when the ejected liquid comes into contact with the link, and the link is rotatably connected to the link and the rotational movement of the detection plate. And a detection arm that moves back and forth in accordance with the detection arm, and the sensor is a photoelectric sensor that is arranged near the tip of the detection arm and that detects the forward and backward movement of the detection arm. The clogging detection device for the liquid ejection nozzle according to item 1.