JP2750744B2 - Lift limit load display device for self-propelled cranes in any operating position - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention is a lifting limit load display device for a self-propelled crane in an arbitrary operating posture.

(Prior Art) Conventionally, a self-propelled crane is provided with a safety device called a moment limiter, which monitors the relationship between the actual load and the limit load under the actual boom operating posture of the self-propelled crane. I have to.

However, this kind of moment limiter can display the limit load, the actual load and the relation of the actual load to the limit load, etc. in the actual boom operation posture state and notify the crane operator of the arbitrary boom operation posture. It was not possible to display the lifting limit load of the self-propelled crane in the above without changing the operating posture of the boom.

An object of the present invention is to provide a lifting limit load display device capable of displaying a lifting limit load of a self-propelled crane in an arbitrary boom operating position without changing the operating position of the boom.

(Means for Solving the Problems) In order to achieve the above object, a lifting limit load display device for a self-propelled crane in an arbitrary operating posture according to the present invention relates to an operating posture of an arbitrary boom of a self-propelled crane. Operating posture manual input means for inputting operating posture information, calculating means for receiving operating posture information from the operating posture manual input means, calculating and calculating a lifting allowable load in the operating posture, and outputting the calculation result; and the calculating means And a CRT or liquid crystal display that receives the calculation result and displays it numerically.The arithmetic means includes a self-propelled crane corresponding to the boom operating attitude based on operating attitude information from the operating attitude manual input means. Boom limit moment output means for calculating the boom limit moment, and the boom limit moment based on the operating posture information from the operating posture manual input means. A boom self-weight crane output means for calculating a boom self-weight moment of the self-propelled crane corresponding to the operating posture, and a boom of the self-propelled crane corresponding to the boom operating posture based on the operating posture information from the operating posture manual input means. A working radius calculating means for calculating a working radius, wherein the boom own weight moment output by the boom own weight moment output means is subtracted from the boom limit moment output by the boom limit moment output means, and the result is calculated by the working radius calculating means. Is divided by the work radius output by the calculation means and output as the calculation result of the calculation means.

(Operation) According to the above configuration, the operating posture manual input means is operated,
By inputting an arbitrary boom operating posture by the means, the arithmetic unit calculates a boom limit moment, a boom own weight moment, and a boom working radius in the boom operating posture according to the input of the operating posture manual input means, and calculates the boom working moment. Subtract the boom's own weight moment from the resulting boom limit moment (this gives the moment due to the lifting limit load), divide this by the working radius (this gives the lifting limit load), and put this result on the display It is displayed.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. First
The figure shows a self-propelled crane, in which a telescopic boom 3 is mounted on a swivel 2 mounted on a vehicle 1 so as to be rotatable. Reference numeral 4 denotes a cab provided on the swivel 2. 5
Are outriggers mounted on the front and rear sides of the vehicle 1 so as to project and ground.

FIG. 2 is a display device of a lifting limit load in an arbitrary operating posture of the self-propelled crane of the present invention used for the self-propelled crane shown in FIG. Operating posture manual input means 7 for inputting information (in the case of the present embodiment, information relating to the elevation angle θ of the boom 2 and the boom length 1) to a calculating means 6 described later;
A calculating means 6 for receiving information from the operating posture manual input means 7 and calculating a lifting allowable load in the operating posture;
And a CRT or liquid crystal display 8 which receives the load result of the arithmetic means 6 and displays it numerically.

The calculating means 6 includes a boom limit moment output means 9 for generating a boom limit moment in a boom operation posture of the self-propelled crane corresponding to the input based on the operation posture information from the operation posture manual input means 7, A boom own weight moment output means 10 for generating a boom and a work radius calculating means 11 for generating a boom work radius are provided. The limit moment output means 9 stores, for each boom operating posture (boom elevation angle θ and boom length 1), a limit value of the tilting moment around the fulcrum of the boom 3. Operating posture manual input means 7
The corresponding stored value is read out as the readout signal using the operating posture information from the CPU. The boom own weight moment output means 10 stores the boom own weight moment generated around the undulating fulcrum of the boom 3 based on the weight of the boom 3 for each boom operating posture (boom elevation angle θ and boom length 1). The corresponding stored value is read from the stored value group as the read signal of the operating posture information from the operating posture manual input means 7. The working radius calculating means 11 calculates the working radius of the boom 3 based on the working posture information from the working posture manual input means 7 (calculates by multiplying the cosine of the boom elevation angle θ by the boom length 1). It is.

Further, the calculating means 6 subtracts the boom self-weight moment output from the boom self-weight moment output means 10 from the boom limit moment output from the boom limit moment output means 9 in the subtracting section 6 ′ (thus, during the boom limit moment). The moment of the included lifting load component is calculated), and the result is divided by the work radius output by the work radius output means in the divider 6 ". The result of the division is sent to the boom operating posture manual input means 7. This corresponds to the lifting limit load of the self-propelled crane in the manually set boom operating posture, and this is numerically displayed on the display 8 as a calculation result of the calculating means 6.

The operator of the self-propelled crane inputs to the boom operating posture manual input means 7 boom operating posture information corresponding to the work content (relation between the operating posture of the boom 3 and the suspended load) to perform crane work with the self-propelled crane. By inputting, the lifting limit load at that time can be determined, so whether the lifting capacity of the self-propelled crane is insufficient before bringing the self-propelled crane to the site or without setting the boom to the posture corresponding to the work content. Can be grasped in advance.

In addition, as an example of the development of the lifting limit load display device in an arbitrary operating posture in the self-propelled crane of the present invention, a part of the configuration of the device is used to realize a conventional moment limiter, that is, an actual self-propelled crane. Can function as a moment limiter that indicates the ratio of the actual moment to the boom limit moment in the boom operating posture. In this case, an actual boom operating posture detecting means for detecting the actual operating posture of the boom 3 (the elevation angle θ of the boom 3 and the length 1 of the boom 3) as shown by a dashed line in FIG.
12 and an actual moment detecting means 13 for detecting an actual value of a boom tilting moment acting around the fulcrum of the boom 3 (in general, a detector for detecting a load acting on the undulating cylinder of the boom 3 is added) At the same time, the detection values of the actual boom operating posture detecting means 12 and the actual moment detecting means 13 are inputted to the calculating means 6. In the calculating means 6, the actual operating posture detecting means
12 and the signal from the operation attitude operation input means 7 are alternatively inputted through a first switching means 14 and the output value of the boom limit moment output means 9 in the arithmetic means 6 is changed to the first value. When the first switching means 14 is connected to the actual operating posture detecting means 12, the data is inputted to a comparing means 16 to be described later via opening / closing means 15 which is closed. The boom limit moment input to the comparison means 16 via the opening / closing means 15 is that in the actual boom operating posture. The comparing means
The signal from the actual moment detecting means 13 is input to 16, and the ratio of the actual moment to the boom limit moment input via the opening / closing means 16 is calculated.
This calculation result is output to the display 8 and displayed on a numerical display 20.
Is done. This displayed value corresponds to the actual load factor of the self-propelled crane. The output of the division unit 6 ″ of the arithmetic unit 6 is passed through a second switching unit 17 that is switched in conjunction with the first switching unit 14, and a lifting limit load display unit 18 in an arbitrary boom operating posture of the display 8 is displayed. To the lifting limit load display section 19 in the actual operating posture.
Reference numerals 1 and 22 denote RAMs provided after the second switching means 17 to temporarily hold and output signals from the second switching means 17. When configured in this manner, a so-called moment limiter can be provided by utilizing a part of the lifting limit load display device of the present invention in an arbitrary operating posture of the self-propelled crane. The first and second switching means 14 and 17 and the opening / closing means in this development may be operated by an operator if necessary, or may be automatically switched at short time intervals. It may be.

In the description of the arithmetic means 6 in the above embodiment, it has been described that each means is separately provided. However, when the arithmetic means 6 is constituted by a digital computer, these means are not separately provided but are mixed. This does not change the embodiment of the present invention.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a self-propelled crane, and FIG. 2 is an explanatory diagram of a display device of a lifting limit load in an arbitrary operating posture of the self-propelled crane of the present invention. Operating posture manual input means; 7, arithmetic means; 6, display;
8, boom limit moment output means; 9, boom own weight moment output means; 10, work radius calculation means; 11

Continuation of front page (72) Inventor Hiroshi Kitayama 1310-19 Tsuruha, Tsuda-machi, Okawa-gun, Kagawa Prefecture Examiner Hisao Suzuki (56) References Japanese Utility Model Sho 61-49784 (JP, U) Japanese Patent Publication Sho 51-11377 (JP, B1) ) Patent 2644352 (JP, B1)

Claims (1)

(57) [Claims] 1. An operating posture manual input means for inputting operating posture information relating to an operating posture of an arbitrary boom of a self-propelled crane, receiving operating posture information from the operating posture manual input means, and calculating a lifting allowable load in the operating posture. Calculation means for calculating and outputting the calculation result; and a CRT or liquid crystal display for receiving the calculation result of the calculation means and numerically displaying the calculation result, wherein the calculation means operates from the operation posture manual input means. Boom limit moment output means for calculating the boom limit moment of the self-propelled crane corresponding to the boom operation posture based on the posture information, and self-propelling corresponding to the boom operation posture based on the operation posture information from the operation posture manual input means Boom self-weight moment output means for calculating a boom self-weight moment of a boom of a type crane; A work radius calculating means for calculating a work radius of a boom of the self-propelled crane corresponding to the boom working posture based on the working posture information from the posture manual input means; and a boom limit output by the boom limit moment output means. Subtracting the boom self-weight moment output by the boom self-weight moment output means from the moment, dividing the result by the work radius output by the work radius calculation means, and outputting the result as the calculation result of the calculation means. Characteristic display device for lifting limit load in any operating posture of self-propelled crane.