JP3215766B2 - Deflection angle sensor of hanging tool in crane - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection angle sensor for easily and accurately detecting the deflection angle of a hanging tool in a crane by providing a vibration damper (damping device) having a vibration damping effect. About.

[0002]

2. Description of the Related Art When a suspended load is carried by a crane,
The hoisting of the suspended load, the traverse of the crane, and the running of the suspended load during traveling. In particular, in order to transport a suspended load with an automatic crane and land the suspended load at a predetermined position, it is necessary to detect the swing of the suspended load and perform control to suppress the swing. Conventionally, as a method of detecting the swing of a suspended load, the swing angle of a wire rope that suspends the suspended load is detected. Examples of this type of detection device include those disclosed in Japanese Utility Model Laid-Open Nos. Sho 57-7781 and 58-123880. However, in this method, the hoisting rope of the crane also moves due to the swing of the hanging tool due to the swing of the suspended load, the rigidity of the rope, the unevenness of the surface, the deformation, the wear of the guide roller, the rope at the time of rope winding up and down, There is a disadvantage that an accurate deflection angle cannot be detected due to a change in the feeding position or the like.

[0003]

The swing angle detection method of the wire rope for hanging the suspended load cannot accurately detect the swing angle of the suspended load. Another detecting device using a wire for detecting a deflection angle is disclosed in JP-A-63-225118. However, there has been a problem that the vibration generated in the gimbal itself to which the sensor is attached hinders the high accuracy of the deflection angle sensor.

SUMMARY OF THE INVENTION It is an object of the present invention to attenuate the vibration of the gimbal of a deflection angle sensor with a vibration attenuator (damping device) to improve the accuracy of the deflection angle detection.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-described object, and a detection base is provided on a sensor base in the vicinity of a gimbal capable of freely rotating in two directions in which a sensor body constituting a deflection angle sensor is installed. The gist of the present invention is to provide a vibration attenuator that locks one end of the rope and attenuates the vibration of the gimbal.

[0006]

The detection rope 10 provided separately from the wire rope for hanging the suspended load is connected to the sensor base 17 to which the inclinometer 19 for detecting the deflection angle is attached. It is pulled by a take-up reel 15 via a fixed tension. Then, the swing amount of the hanging tool 4 becomes the movement of the detection rope 10, and the sensor base 17 attached to the gimbal 18 that can rotate in two directions is tilted. However, since the detection rope 10 is a thin wire,
The wire itself vibrates due to the vibration during the movement of the crane,
Since the gimbal 18 is rotatable by this vibration, the vibration is transmitted to the inclinometer 19 as it is. For this reason, the detection signal of the original minute deflection angle of the hook block 4 overlaps with the vibration of the detection rope itself, and accurate deflection angle detection is not possible. According to the structure of the present invention, a damper plate 23 is attached to the sensor base 17, and a vibration damper (a damping device) 2 below the damper plate 23 is immersed in damping oil 22 in a hollow cylindrical oil pan 21.
0 is attached. Therefore, extra vibration having a vibration frequency higher than the vibration of the deflection angle of the detection rope 10 is sufficiently attenuated by the damping device, and only the original deflection angle of the detection rope 10 is detected by the inclinometer 19. Thus, extra vibration of the detection rope can be eliminated, and the detection accuracy of the deflection angle sensor can be improved.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a crane according to the present invention. 1 in the figure
Is a trolley. The trolley 1 lifts a suspended load by driving a hoisting drum 2 to raise and lower a suspending tool 4 such as a hook block provided at a lower end of a wire rope 3. When driven, they traverse along the girder 6. The girder 6 has a traveling motor 7.
Is driven and travels along the traveling rail 8 together with the trolley 1.

When the trolley 1 hanged by the hanging tool 4 by the wire rope 3 traverses the girder 6, the hanging tool 4
Will be transported while swinging from side to side. This hanging tool 4
In the present invention, as shown in FIG.
A rope for detecting the deflection angle is installed in the vehicle.

The detection rope 10 is wound around a detection rope take-up reel 15 provided on the girder 6 at a base end thereof, and is connected to a hanger-side sheave 12 projecting from the hanger 4 via a guide sheave 14 provided on the garter. It is stretched and its tip is connected to a sensor base 17 to which an inclinometer 19 for detecting a deflection angle is attached. The other end is the hanging sheave 12 and the guide sheave 1.
4 through a take-up reel 15 at a constant tension.

[0010] The sensor base 17 is provided on a mounting bracket 16 provided on the trolley 1. The swing amount of the hanging tool (hook block) 4 becomes the movement of the detection rope 10, and the sensor base 17 attached to the gimbal 18 that can rotate in two directions is tilted. It is configured to be detected as.

Further, since the detection rope 10 is a thin wire, the wire itself vibrates due to the vibration during the movement of the crane, and the gimbal 18 is rotatable by the vibration. Transmitted to. For this reason, the detection signal of the original minute deflection angle of the hanging tool (hook block) 4 overlaps with the vibration of the detection rope itself, and accurate detection of the deflection angle cannot be performed.

As a countermeasure, as shown in FIG. 2 in which the gimbal 18 in FIG.
Attach the damper plate 23, and install the damper plate 2
Below 3, a vibration damper (damping device) 20 immersed in damping oil 22 in a hollow cylindrical oil pan 21 is provided.

For this reason, extra vibration having a vibration frequency higher than the vibration of the deflection angle of the detection rope 10 is sufficiently attenuated by the vibration attenuator 20 (damping device), and only the original deflection angle of the detection rope 10 is reduced. Is detected by the inclinometer 19, and highly accurate detection becomes possible.

[0014]

As described above, extra vibration of the detection rope can be eliminated, and the detection accuracy of the deflection angle sensor can be improved.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a swing angle sensor of a hanging tool in a crane according to the present invention.

FIG. 2 is an enlarged view of a main part.

FIG. 3 is a schematic explanatory view of a crane.

[Explanation of symbols]

 Reference Signs List 1 trolley 2 hoisting drum 3 wire rope 4 hanging tool 5 traversing motor 6 girder 7 running motor 8 running rail 10 detection rope 12 hanging tool side sheave 14 guide sheave 16 mounting bracket 17 sensor base 18 gimbal 19 inclinometer 20 vibration damper 21 Hollow cylindrical oil pan 22 Damping oil 23 Damper plate

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B66C 13/22

Claims (1)

(57) [Claims] 1. A vibration attenuator that locks one end of a detection rope and attenuates vibration of a gimbal is provided on a sensor base near a gimbal that can freely rotate in two directions in which a sensor main body constituting a deflection angle sensor is installed. A swing angle sensor of a lifting tool in a crane.