JPH036609B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a reflective photoelectric switch for checking the presence or absence of articles and their quantity when storing articles in a warehouse or the like. This invention relates to a monitoring device for checking and adjusting.

In recent years, factories and warehouses have been made unmanned by introducing computer systems, and work has been automated by computer control. For example, as shown in Figure 1,
A traveling rail 3 is laid between the factory 1 and the warehouse 2,
A crane 4 for loading and transporting goods manufactured in the factory 1 is connected to the factory 1 and the warehouse 2 via a traveling rail 3.
Run between. As shown in FIGS. 2 and 3, racks 6 for storing articles such as seamless pipes 5 are installed in multiple stages on both sides along the traveling rail 3. Forks 7 are attached to both sides of the main body of the crane 4, and the seamless pipe 5 is conveyed via the forks 7. Further, the crane 4 moves up and down via the support column 4a. Here, the crane 4 is controlled by a computer system, which stores the position where the crane 4 stops in front of each rack 6 in the storage device of the computer system, and also stores the storage state of the seamless pipe 5 in each rack 6. By memorizing it, it becomes possible to select the rack 6 that can accommodate the seamless pipe 5 newly transported by the crane 4 from the factory 1. However, if the computer system that controls the above operation encounters a problem and another seamless pipe 5 is stored in the rack 6 that has already stored a predetermined number of seamless pipes 5,
The seamless pipe 5 may collapse under load, leading to a serious accident. Therefore, before storing the seamless pipe 5 in the rack 6, a photoelectric switch is required to check the presence or absence of the seamless pipe 5 on the rack 6 and its amount, and the operating state and setting position of the photoelectric switch is checked. In addition, a monitor device for adjustment must be installed on the photoelectric switch.

The configuration of a conventional reflective photoelectric switch is as follows.

In Fig. 4, 8 is a reflective photoelectric switch mounted on a part of a crane (not shown), 9 is a light emitting/receiving part installed inside the reflective photoelectric switch 8, and this is a light emitting diode or the like. Consists of a light emitter 10 that emits invisible light such as infrared light using a light emitter, and a light receiver 11 that receives reflected light of the invisible light emitted from the light emitter 10 using a light receiving element such as a phototransistor. Has a structure. Reference numeral 12 denotes a recovery reflector which is a reflector placed behind the seamless pipe 5, and reflects the incident light in the same direction as the incident direction. Reference numeral 13 denotes a fixed reflecting mirror disposed opposite to the optical axis of the light projecting/receiving section 9, which reflects the invisible light projected by the light projecting/receiving section 9 vertically downward. Reference numeral 14 denotes a movable reflector disposed vertically below the fixed reflector 13, which is connected to a pulley 15.
It is connected via a connecting member 17 to a part of a V-belt 16, etc., which is wrapped around the V-belt 16, etc. Reference numeral 18 denotes a pulse motor, and when this is driven, the V-belt 16 rotates through the pulley 15, and the movable reflecting mirror 14 moves up and down continuously by a predetermined interval.

Therefore, with the above configuration, the invisible light projected from the light projector 10 inside the light projecting/receiving section 9 is transmitted to the fixed reflecting mirror 1.
3, the light is reflected vertically downward, and is reflected again in the horizontal direction by the movable reflecting mirror 14, and is projected and scanned by a predetermined vertical interval. Here, if the seamless pipe 5, which is an object to be detected, exists on the optical path of the invisible light reflected by the moving reflecting mirror 14, the invisible light that has reached the circumferential surface of the pipe 5 will not be reflected. However, if the seamless pipe 5 does not exist on the optical path, the invisible light reflected by the movable reflector 14 will pass through the recovery reflector 12.
, is reflected again by the movable reflecting mirror 14 and the fixed reflecting mirror 13, and is reflected by the light receiving device 1 inside the light emitting/receiving section 9.
1 is detected. The light emitting/receiving section 9 is of a biaxial type as shown in FIG. 5, and since the object to be detected is housed long in the horizontal direction,
The invisible light emitted from the lens is sufficiently focused in the vertical direction and diffused in the horizontal direction.
Further, the light receiving range of the light receiver 11 inside the light emitting/receiving section 9 is set to be a diffused range as shown in the figure, and the light receiving range of the invisible light emitted from the light projector 10 and the light receiving range of the light receiver 11 are set to be a diffused range as shown in the figure. In the polymerization range, invisible light reflected by the retroreflector 12 is detected.
That is, if the seamless pipe 5 exists within the polymerization range, the invisible light projected from the light projector 10 will not be reflected on the circumferential surface of the seamless pipe 5, but if the seamless pipe 5 does not exist within the polymerization range,
The invisible light projected from the light projector 10 is reflected by the retroreflector 12, and the reflected invisible light within the overlapping range is detected by the light receiver 11. Therefore, the presence or absence of an article and its amount are detected based on the presence or absence of the reflected light.

However, in the past, since the light emitted from the light emitter 10 inside the light emitting/receiving section 9 installed in the reflective photoelectric switch 8 is invisible light, it is necessary to check the operating state and setting position of the reflective photoelectric switch 8. , and it is impossible to adjust, and if the optical axis of the invisible light is out of alignment, or if the upper and lower limits of the movement interval of the movable reflector are not at the appropriate positions, check this and make adjustments. Therefore, the detection accuracy of the reflective photoelectric switch is significantly reduced.

The present invention has been made in view of and solved the above-mentioned problems of the conventional art. To provide a monitor device for a reflective photoelectric switch, characterized in that a fixed reflecting mirror is provided with a window that is attached to a fixed reflecting mirror and through which visible light reflected from a moving reflecting mirror passes. Embodiments of the present invention will be described below based on the drawings.

In Fig. 6, reference numeral 9' denotes a light emitting/receiving section installed inside the reflective photoelectric switch 8'. The projector 10 and the projector 10
In addition to the conventional light receiver 11 that receives reflected light of invisible light projected from a light source using a light receiving element such as a phototransistor, a new light receiver 11 that receives light parallel to the optical axis of the light projector 10 and the light receiver 11 in the horizontal direction is added. A monitor projector 19 is installed that projects visible light such as red light having an axis. Reference numeral 13' denotes a fixed reflecting mirror, and as shown in FIG. 7, a metal reflective film 20 is deposited on the reflecting surface thereof, and a window 21 having a predetermined area on which no vapor deposition is made is formed in a part of the reflecting mirror. There is. 22
is an optical axis adjustment window which is a through hole formed in the main body of the reflective photoelectric switch 8', and this is the optical axis adjustment window which is a through hole formed in the body of the reflective photoelectric switch 8'.
Window 2, which is a non-evaporated portion formed on the reflective surface 3'
1 and is set at a position where the reflected light from the movable reflector 14 that passes through the fixed reflector 13' can be recognized with the naked eye. The configuration other than the above and the names and symbols of the members are the same as those of the conventional reflective photoelectric switch shown in FIG.

Therefore, with the above configuration, the presence or absence of the seamless pipe 5 on the rack 6 and its amount can be detected by the same operation as the conventional one. When visible light is emitted from the monitor projector 19 installed inside the light emitting/receiving section 9', the visible light is reflected vertically downward by the fixed reflector 13' and then horizontally by the movable reflector 14. reflected again. The reflected light reflected by the retroreflector 12 is again reflected vertically upward by the movable reflector 14, and the reflected light passes through the window 21 formed on the reflective surface of the fixed reflector 13'. Mirror 13'
Transmit. Therefore, the reflected light can be recognized with the naked eye through the optical axis adjustment window 22 formed at a predetermined position on the main body of the reflective photoelectric switch 8', and the operating state and setting position of the reflective photoelectric switch 8' can be confirmed. adjust.

In the fixed reflecting mirror 13', the window 21 through which the reflected light from the movable reflecting mirror 14 passes is not limited to the above embodiment, and the window 21 may be formed by providing a through hole in the portion. Good too.

As explained above, according to the present invention, by providing a monitor projector that emits visible light having an optical axis horizontally parallel to the optical axis of invisible light emitted from the projector inside the light projecting/receiving section. , it becomes possible to recognize the optical axis with the naked eye, and it is also possible to confirm whether the upper and lower limits of the moving interval of the movable reflector are at appropriate positions. Therefore, by being able to confirm and adjust the operating state and setting position of the reflective photoelectric switch, it is possible to dramatically improve the detection accuracy of the reflective photoelectric switch.

[Brief explanation of the drawing]

Figure 1 is a plan view showing the factory and warehouse, Figure 2 is an explanatory diagram showing the crane and rack in the warehouse, Figure 3 is a perspective view showing seamless pipes stored in the rack, and Figure 4 is an explanatory diagram showing the crane and rack in the warehouse. FIG. 5 is an explanatory diagram showing a conventional reflective photoelectric switch. FIG.
The figure is an explanatory view showing an embodiment of the monitor device in a reflective photoelectric switch according to the present invention, and FIG. 7 is a perspective view showing a fixed reflecting mirror of the embodiment according to the present invention. 5...Article, 8,8'...Reflection type photoelectric switch, 9,
9'... Light projecting/receiving section, 12... Reflecting plate, 13, 13'... Fixed reflecting mirror, 14... Moving reflecting mirror, 19... Monitor floodlight, 21... Window.

Claims (1)

[Claims] 1. Equipped with a light emitting/receiving section that projects light onto a reflecting plate through the storage position of the article and detects the presence or absence of the article based on the presence or absence of the reflected light,
a fixed reflecting mirror disposed opposite to the light projecting/receiving section and reflecting the light projected from the light projecting/receiving section at a predetermined angle; In a reflective photoelectric switch equipped with a movable reflector that reflects the light again at a predetermined angle and projects the light onto a reflector plate through the storage position of the article, an optical axis that is the same as or parallel to the optical axis of the light projecting/receiving section. A monitor projector is attached to the light projecting/receiving section, and the fixed reflecting mirror is provided with a window through which the visible light reflected from the movable reflecting mirror passes through. Monitor device for reflective photoelectric switches.