JP3205142B2 - Crane movable range display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable range display device for the tip of a telescopic boom of a mobile crane.

[0002]

2. Description of the Related Art As disclosed in Japanese Patent Application Laid-Open No. Sho 56-75393, a crane is simulated to store the movable range of an upper revolving unit (including a working machine). There is a method for displaying the movable range of the crane as an image as shown in FIG. In FIG. 5, a is an X coordinate indicating a working radius,
b indicates the Y coordinate indicating the lift, and c indicates the boom tip position.

[0003]

Conventionally, when setting a movable range by simulating a crane, the operation is usually performed in a state in which a load is not suspended. However, in a load operation, a rated working radius changes according to a lifting load. However, even within the movable range due to the range limitation, an overload may occur depending on the lifting load. However, for example, from the display image of the movable range display of the crane according to the conventional technique shown in FIG. 5, it is not possible to grasp the overloaded area, so that appropriate measures cannot be taken in advance to prevent danger. It was an issue.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an invention according to claim 1 is provided so that a revolving body mounted on a vehicle so as to be revolvable can be raised and lowered. In a mobile crane to which a telescopic boom is attached, a boom length detecting means for detecting a length of the telescopic boom, a boom angle detecting means for detecting an elevation angle of the telescopic boom, and a load acting on the telescopic boom are detected. Load detection means, work state input means for inputting the work state of the upper revolving superstructure and the lower traveling body, and / or work state detection means for detecting the above state, at least the lift of the mobile crane,
The working radius and the boom angle include a movable range input means capable of setting a movable range, a display unit capable of displaying an image, and the display unit performing calculations based on signals from the detection units or the input units. And a control unit for outputting a signal for displaying the calculation result. The display unit displays rectangular coordinates so that the X coordinate indicates the working radius and the Y coordinate indicates the head. Calculate and calculate the actual load at the current telescopic boom posture based on the position telescopic boom tip position image, movable range image, and each signal at the position, and then calculate and calculate the rated working radius for the actual load. It is configured to superimpose and display the rated working radius. According to a second aspect of the present invention, in the first aspect of the present invention, a hook position is displayed on a screen by providing a rope length detecting means and a hook lift calculating means.

With the above configuration, the movable range in which the boom can move without interfering with the building, electric wires, etc., the rated working radius by the current suspended load and the position of the boom tip are superimposed irrespective of the load (suspended load). Since the image is displayed, the operator can intuitively understand the movable range of the crane when hoisting and retracting the crane, even if the crane is overloaded within the movable range due to the range limitation, by looking at this display image. Since it can be grasped accurately, it is possible to cope with a dangerous state in advance, which is useful for confirming the safety of crane operation.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system block diagram showing a configuration of a display device according to the present invention.
Based on the boom angle detecting means 2, load detecting means 3, work state inputting means or detecting means 4, movable range inputting means 5, and, if necessary, detecting units and inputting units such as rope length detecting means 8, etc. , Boom tip position 24, control unit 7 for storing and calculating rated working radius 23, movable range 35, hook lift and the like from actual load and rated total load curve, and display unit 6 for displaying the result. I have.

FIG. 2 shows work state input means or detection means 4,
An embodiment is shown in which a movable range input means 5 is provided, and a display provided at a corresponding position of a crane illustration and a display unit 6 having a multi-display are integrated.

FIG. 3 shows an example of a display image on the multi-display of the display unit 6. In the rectangular coordinates consisting of the X coordinate 21 and the Y coordinate 22, a boom angle upper limit 32 and a boom angle lower limit 3 are set.
3. Lift limit 34, Work radius limit 35, Boom length limit 3
6, the boom tip position 24 and the rated working radius 23 based on the current lifting load are displayed. It can be seen that overload occurs when the boom tip position 24 exceeds the rated working radius 23 due to the current lifting load due to the boom lowering operation. That is, since the overturn limit area (rated working radius 23) due to the load (hanging load) is located before the working radius limit 35, which is the movable range that can move regardless of the load (hanging load), the movable range of the boom is limited. It can be intuitively grasped that the falling limit area (rated working radius 23) is regulated by the amount of the suspended load. FIG. 4 shows an example of a display image in which the boom tip position 24 and the hook position 25 are added when the rope length detecting means 8 is provided in FIG.

[Brief description of the drawings]

FIG. 1 is a system block diagram showing a configuration of a display device according to the present invention.

FIG. 2 shows an embodiment of a display unit according to the present invention.

FIG. 3 is an example of a display image according to the embodiment of FIG. 1;

FIG. 4 is an example of a display image according to the embodiment of FIG. 1;

FIG. 5 shows an example of a conventional display image.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Boom length detection means 2 Boom angle detection means 3 Load detection means 4 Work state input means or detection means 5 Movable range input means 6 Display unit 7 Control unit 8 Rope length detection means control unit 21 X coordinate 22 Y coordinate 23 Rated working radius 24 Boom tip position

Claims (2)

(57) [Claims] 1. A mobile crane having a revolving and retractable boom mounted on a revolving body rotatably mounted on a vehicle, a boom length detecting means for detecting a length of the telescopic boom, Boom angle detection means for detecting an elevation angle of the boom, load detection means for detecting a load acting on the telescopic boom, work state input means for inputting work states of the upper revolving unit and the lower traveling unit, and / or the state described above. Operating state detecting means for detecting the height of the mobile crane, working radius, boom undulation angle, movable range input means capable of setting a movable range, and a display unit capable of displaying an image, A control unit for performing an operation based on a signal from the detection unit or each input unit and outputting a signal for displaying the operation result on the display unit, and displaying an X coordinate on the display unit. , The rectangular coordinate is displayed so that the Y coordinate indicates the lift, the tip position image of the telescopic boom, the movable range image, and the actual load in the current telescopic boom posture based on each signal at the corresponding position on the rectangular coordinate. Calculated and calculated, and then calculated and calculated the rated working radius for the actual load, and superimposed and displayed the rated working radius, thereby displaying the movable range of the crane. 2. The movable range display device for a crane according to claim 1, further comprising a rope length detecting means and a hook head calculating means for displaying a hook position on a screen.