JP2004018196A - Suspension part swing detecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect swing of a suspension part regardless of feeding length of a suspension material with a simple device constitution. <P>SOLUTION: On the suspension part 2 of a hoist X, a mirror 21 for reflecting radiation light from a base 1 is provided opposing the base 1, and on the base 1, a reflection type photoelectric sensor 11 opposing the mirror 21 and a controller 12 for stopping operation of the hoist X when an OFF signal is put in from the reflection type photoelectric sensor 11 are provided. The reflection type photoelectric sensor 11 is provided with a light emitting part 11a for emitting light toward the suspension part 2, a light receiving part 11b for receiving reflected light from the mirror 21, and an output circuit 11c for putting out an ON signal or an OFF signal depending on whether the light receiving level at the light receiving part 11b is at a predetermined level set in advance or above or not. The reflection type photoelectric sensor 11 is adjusted so that the ON signal is put out when the mirror 21 exists in a range of a predetermined detection angle θ, while the OFF signal is put out when it is out of the range of the detection angle θ. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a suspension swing detection device that detects the swing of a suspension suspended from a base of a hoist, a crane, or the like by a suspension member.
[0002]
[Prior art]
In a factory or the like, as a luggage transfer device, a hand-operated suspension (elevating platform, etc.) using a suspension material such as a wire belt from a movable carriage (equivalent to the base) running along a rail arranged near the ceiling ) Is suspended so as to be able to move up and down, and a suspended lifting device (a so-called hoist, crane, or the like) that uses the hand to hold and transport the luggage is used. In such a hoist or the like, when the moving carriage moves or when the hanging portion is raised and lowered by adjusting the amount of unwinding (winding amount) of the suspension material by a predetermined winding device, Although the hanging part swings, if the hanging part swings more than a predetermined amount, it is necessary to stop the operation of the suspension type lifting device to ensure safety.
Conventionally, as a method of detecting the swing of the hanging portion, for example, Japanese Patent Application Laid-Open Nos. 8-175786 (No. 1), 9-257475 (No. 2), and 11-3350071 (No. 3) ) And the like, there is disclosed a technique for detecting a relative position, a swing angle, and the like of the hanging portion with respect to the movable cart. In these conventional techniques, light from a light source or light retroreflecting means (corner cube or the like) provided in the hanging portion is transmitted to a camera or a semiconductor position detecting element (PSD: position sensing device) provided in the movable carriage. By receiving the light, the two-dimensional position of the suspension and the deflection angle of the suspension are detected.
[0003]
[Problems to be solved by the invention]
However, the techniques disclosed in the above publications require a camera, an image processing unit, a PSD, and the like for detecting the two-dimensional position of the suspension, and have a problem that the apparatus is complicated and expensive. . In particular, in the above publications 2 and 3, since a light receiver such as a camera is required on the side of the movable carriage and a light source such as an LED is provided on the side of the suspension, power and control signals are applied between the suspension and the carriage. Must be transmitted, and the device becomes more complicated. Further, in order to perform such two-dimensional position detection, it is necessary to adjust the focus of light from the light source and the reflection means of the suspension using a camera, a PSD, or the like, but the extension length of the suspension material is short. In such a case, there is also a problem that the focus cannot be adjusted and the position (sway) of the suspension cannot be detected.
Accordingly, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a suspension swing detection device capable of detecting the suspension swing regardless of the extension length of the suspension material with a simple device configuration. To provide.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a suspension swing detection device for detecting the swing of a suspension suspended from a base by a suspension member, comprising: a light emitting unit installed on the base or the suspension. A reflecting means installed on the hanging part or the base to reflect light from the light emitting means; a light receiving means installed on the base or the hanging part to receive light from the reflecting means; And a swing detecting means for detecting the swing of the hanging part based on the light receiving level.
Thus, the suspension unit is provided with a simple device configuration in which a reflection type optical sensor such as a photocoupler having the light emitting unit and the light receiving unit is provided without providing a camera, an image processing unit, a PSD, or the like on the base. Can be detected. In addition, when the light receiving means detects the light receiving level of the reflected light from the reflecting means, there is no need for fine focus adjustment as in the case of performing position detection by image processing or PSD, etc. The swing of the hanging part can be detected regardless of the extension length.
[0005]
Further, the suspension swing detection device may be configured such that the base is a movable carriage that travels along a predetermined rail, or that the suspension is adjusted by adjusting the length of the suspension material that is extended from the base. One that is configured to be able to move up and down, for example, one that is applied to a crane, a hoist, or the like can be considered.
Further, if the swing detecting means detects a swing of the suspension lower than a predetermined value, the running operation of the base and / or the adjusting operation of the extension length of the suspension material is stopped. This is a safety device when abnormal swinging occurs in the hanging part.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments and examples of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. The following embodiments and examples are mere examples embodying the present invention, and do not limit the technical scope of the present invention.
Here, FIG. 1 is a diagram showing a schematic configuration of a hoist X according to an embodiment of the present invention, FIG. 2 is a diagram showing a state in which a gripper of the hoist X according to the embodiment of the present invention is largely shaken, and FIG. It is a figure showing the state where the gripper of hoist X concerning an embodiment of the invention was inclined.
As shown in FIG. 1, a hoist X according to an embodiment of the present invention is roughly divided into a mobile trolley 1 (an example of the base) that runs along a rail 3 arranged near a ceiling, It comprises a suspension member 4 such as two wire belts suspended from a movable trolley 1 and a gripper 2 (an example of the suspension portion) attached to a lower end of the suspension member 4 and capable of gripping a load. . The gripper 2 is moved up and down by a winding / unwinding operation of the suspension member 4 by a winding drum (not shown) provided on the movable carriage 1. The gripper 2 is provided with a mirror 21 (an example of the reflection unit) that faces the movable vehicle body 1 and reflects light emitted from the movable carriage 1 side. The mirror 21 has a passive function of merely reflecting light and does not require power or a control signal. Therefore, there is no need to provide a transmission means for transmitting electric power or a control signal to the gripper 2 side, between the movable trolley 1 and the gripper 2, and the configuration of the apparatus is simplified.
Further, the movable trolley 1 has a reflection type optical sensor 11 such as a reflection type photocoupler provided opposite the mirror 21, and the hoist X based on a signal from the reflection type optical sensor 11. A controller 12 is provided for permitting or prohibiting (stopping) the running operation of the movable cart 1 and the winding / unwinding operation of the suspension member 4. Further, the reflection type optical sensor 11 receives a light emitting unit 11 a (an example of the light emitting unit) that emits light toward the gripper 2, and receives light reflected by the mirror 21 by the light emitting unit 11 a. The light receiving unit 11b outputs an OFF signal when the light receiving level of the light receiving unit 11b is equal to or lower than a predetermined level, and an output circuit 11c that outputs an ON signal when the light receiving level exceeds the predetermined level. (An example of means). Here, the reflection type optical sensor 11 outputs the ON signal when the mirror 21 is within the range of the predetermined detection angle θ, and outputs the OFF signal when the mirror 21 is out of the range of the detection angle θ. It is adjusted so that. Such a reflection type optical sensor 11 has a simple structure and is inexpensive as compared with a conventionally used camera and image processing device or PSD. Here, the predetermined level set in the reflection type optical sensor 11 is, for example, the controller 12 or the like in accordance with the feeding length of the suspension member 4 detected by providing a rotary encoder on the winding drum. May be set.
[0007]
Next, the swing detection by the hoist X will be described.
As shown in FIG. 1, when the swing of the gripper 2 is small (or no swing), the mirror 21 exists within the range of the detection angle θ of the reflective sensor 11, Is turned ON. In this case, the controller 12 operates the hoist X or permits the operation.
On the other hand, as shown in FIG. 2, when the swing of the gripper 2 is larger than a predetermined value, that is, when the swing of the gripper 2 is out of the range of the detection angle θ, the reflection type The signal output of the optical sensor 11 is turned off. At this time, the controller 12 inhibits the operation of the hoist X (stops the operation). Further, even when the gripper 2 exists within the range of the detection angle θ, when the gripper 2 is inclined as shown in FIG. 3, the signal output of the reflection sensor 11 is turned off, The controller 12 prohibits the operation of the hoist X. As a result, the operation of the hoist X can be stopped by detecting a dangerous state in which the gripper 2 is inclined, as in the case where the gripper 2 swings greatly.
Further, in the reflection type sensor 11, since the focus of the reflected light from the mirror 21 does not cause any problem, it is possible to detect the swing and the inclination of the gripper 2 which are equal to or more than a predetermined value regardless of the extension length of the suspension member 4. . Further, in general, the smaller the payout length of the suspension member 4 becomes, the smaller the swing of the gripper 2 becomes a problem (danger). On the other hand, in the hoist X, the suspension member 4 is moved in accordance with the detection angle θ. The shorter the extension length (the shorter the distance between the reflection-type sensor 11 and the mirror 21), the smaller the swing of the grip 2 can be detected, which is suitable as a safety device such as a hoist.
[0008]
【The invention's effect】
As described above, according to the present invention, it is possible to detect the swing and inclination of the suspension lower than a predetermined value with a very simple configuration, and it is possible to realize a safety device such as a hoist very easily and inexpensively. Become. In addition, the swing and inclination of the suspension can be detected regardless of the extension length of the suspension.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a hoist X according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a state in which a gripper of the hoist X according to the embodiment of the present invention has largely shaken.
FIG. 3 is a diagram illustrating a state in which a gripper of the hoist X according to the embodiment of the present invention is inclined.
[Explanation of symbols]
1. Moving trolley (base)
2 ... gripper (hanging part)
3 ... Rail 4 ... Suspension material (wire belt etc.)
11 ... Reflection type optical sensor 11a ... Light emitting unit 11b ... Light receiving unit 11c ... Output circuit 12 ... Controller 21 ... Mirror

Claims (4)

In the suspension swing detection device that detects the swing of the suspension suspended from the base by the suspension material,
Light-emitting means installed on the base or the suspension,
Reflection means for reflecting light from the light emitting means, the reflection means being provided on the hanging portion or the base;
Light receiving means installed on the base or the hanging portion to receive light from the reflecting means;
Shaking detecting means for detecting shaking of the hanging part based on a light receiving level of the light receiving means;
1. A suspension swing detection device, comprising: The suspension swing detection device according to claim 1, wherein the base is a movable carriage that travels along a predetermined rail. The hanging part swing detecting device according to claim 1, wherein the hanging part is configured to be able to move up and down by adjusting a feeding length of the hanging material from the base. When the swing detecting means detects the swing of the suspension lower than a predetermined value, the running operation of the base and / or the adjusting operation of the extension length of the suspension material is stopped. 4. The suspension swing detection device according to any one of 2 and 3.

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