JP2512959Y2 - Mobile crane load status display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an overload prevention device for a mobile crane,
The present invention relates to a load status display device that enables a driver of the mobile crane to predict in advance the risk of a vehicle falling over during lifting work and the risk of damage to a crane jib.

(Prior Art) FIG. 5 shows a specific example of a conventional load status display device for a mobile crane.

In the figure, a is a safety factor display bar graph showing the load ratio until the vehicle falls, b is a front display screen, and when the lamp of b ₁ is turned on, it means that the boom of the crane is located in front of the vehicle, b _When the lamp of ₂ lights up, the lamp of b ₃ shows the back, and the lamp of b ₄ shows the right.

c is an auxiliary jib undulation angle display screen, d is a boom extension length display screen, e is a suspended actual load display screen, f is a rated load display screen, g is a boom undulation angle display screen, and h is a swing center of the swivel base. Working radius display screen showing the horizontal distance from the wire rope to the wire rope. J is j ₁ , which corresponds to the outrigger extension width.
The lamp points of j ₂ , ..., j ₆ are designed to light up.

When the safe work range within the rated load is exceeded due to the action of the overload prevention device (not shown) provided in the mobile crane, the warning lamps are lit or blinked.
A buzzer sounds continuously or intermittently to give a warning or warning to the driver.

(Problems to be Solved by the Invention) The conventional load status display device described above is excellent in that it clearly informs the driver of the load status of the mobile crane, but it still has the following problems.

(1) Since there are many numerical status displays, it is difficult to grasp the status at a glance when working in various settings of the mobile crane.

(2) The stability or load factor over the entire circumference of the turn changes depending on the overhang amount of the outrigger, but the driver cannot predict the degree of change.

(Means and Actions for Solving the Problems) The present invention has been made to solve the above problems, and in a load status display device for a mobile crane, a graphic showing an outrigger extension amount on a display screen, Depending on the amount of outrigger overhang, the rated load curve is displayed with a large radius when the stable area is wide and with a small radius when the stable area is narrow, and the smaller rated load curve is displayed over the entire circumference of the turn, and the current load is displayed. Display points simultaneously,
Enabled to predict the safe range of turning direction.

Therefore, the rated load curve over the entire circumference changes depending on the overhang amount of the outrigger, but a small rated load curve is displayed inside the large rated load curve over the entire circumference, so that the range of the current load point in the turning direction is safe. You can predict at a glance if you can work.

(Example) Next, the Example of this invention is described based on drawing.

FIG. 1 is an explanatory drawing showing a main part of a load status display screen of an embodiment according to the present invention, in which a vertical axis of a rectangular coordinate axis 11
Indicates the load (TON), and the horizontal axis 12 indicates the working radius (corresponding to h described in FIG. 5) (m).

Then, the rated load curves 7 and 8 determined by the setting conditions of the crane work are displayed in a graph as shown in the figure.

Curve 7 shows the larger outrigger overhang,
Curve 8 indicates the smaller one Dash-dotted lines 9 and 10 are the 90% rated load lines according to curves 7 and 8, respectively, and point 1 indicates the current load condition at the time of work (abbreviated as the current load point below) Do)
When the curve reaches curve 9 or 10, an alarm is issued to inform the driver of the danger.

The current load point 1 is the current load 2 at the position on the vertical axis 11,
The position on the horizontal axis 12 is the current radius 3, and 4 indicates the maximum radius under the current load.

The current load point 1 is displayed in a different color by blinking or a color display.

 5 is a boom length and 6 is a boom angle.

The current load point 1 moves on the screen by performing a crane work, and the driver can grasp at a glance the degree of proximity to the rated load curves 7 and 8 or the 90% load curves 9 and 10, so that the rated load and The degree of margin up to the warning line can be easily recognized, and the maximum radius 4 when the boom is tilted can be predicted from the working state.

Fig. 2 is a diagram 21 showing the outrigger extension and curves 27 and 28 showing the rated load according to the outrigger extension.
It is a screen that displays the relationship with
A small load rating curve 28 is displayed inside 27 over the entire circumference.

And curves 27 and 28 correspond to curves 7 and 8 shown in FIG. 1 above, respectively.

 22 indicates the turning angle of the current load point 1 with respect to the front of the vehicle body.

The rated load curve over the entire circumference changes depending on the overhang of the outrigger. However, since the small rated load curve 28 is displayed inside the large rated load curve 27 over the entire circumference, the current load point 1 is in this range of the turning direction. The driver can predict at a glance whether the work can be done safely.

The screen shown in FIG. 2 can be displayed on the screen simultaneously or separately from the screen shown in FIG.

FIG. 3 is an example of a screen in which the screens shown in FIGS. 1 and 2 are displayed at the same time. When the current load point 1 is at the position shown in FIG. It is impossible to turn to, and it is easy to see that you have to raise the boom and turn.

FIG. 4 is a block diagram for outputting to the load status display screen shown in FIG. 1, and includes an outrigger setting switch 41, a jib length setting switch 42, a wire rope multiplication setting switch 43 and a jib length. Overload prevention controller for input signals from detection sensor 44, jib angle detection detection sensor 45, load detection sensor 46, and turning angle detection sensor 47
The data is exchanged with the rated load curve storage memory 49, output to the drawing control device 50, and displayed on the load status display screen.

(Effect of the device) Since the device of the present invention has been described in detail above, the rated load curve over the entire circumference of the turn changes depending on the overhang amount of the outrigger, but a small rated load curve over the entire circumference is inside the large rated load curve. Is displayed, it is possible to predict at a glance to what range in the turning direction the current load point can be safely worked.

Therefore, the operator of the mobile crane can operate the crane while monitoring the load status display screen according to the present invention, so that the operator can grasp the load status at the time of crane work at a glance and continue the crane work. Since it is possible to predict the danger by recognizing the margin degree when doing, it is possible to achieve a great effect that the work efficiency is improved while ensuring the safety of the work.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a load status display screen of an embodiment according to the present invention, and FIG. 2 is an explanatory view showing a screen showing a relationship between a figure showing an outrigger extension amount and a curve showing a rated load, FIG. 3 is an explanatory diagram showing a screen in which the screens shown in FIGS. 1 and 2 are simultaneously displayed, FIG. 4 is a block diagram for outputting to a load status display screen, and FIG. 5 is a conventional load. 1 shows a specific example of a status display device. 1 ... Current load point, 2 ... Current load, 3 ... Current radius, 7,8 ... Rated load curve, 11 ... Vertical axis, 12 ... Horizontal axis, 21 ... Figure showing outrigger overhang, 27 ... Rated load curve, 28 … Rated load curve,

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yukio Kinoshita 1-9 Minamidai, Kawagoe City, Saitama Prefecture Komatsu MEC Co., Ltd. Headquarters factory (72) Kazuaki Ogusa 1-9 Minamidai, Kawagoe City, Saitama Prefecture Komatsu MEC Co., Ltd. Headquarters factory (56) Bibliography Sho 61-119585 (JP, U) Japanese Patent Publication 3-17759 (JP, B2) International publication 90/7465 (WO, A)

Claims (1)

(57) [Scope of utility model registration request] 1. A load condition display device for a mobile crane, comprising: a graphic showing an outrigger extension amount on a display screen;
Depending on the amount of outrigger overhang, the rated load curve is displayed with a large radius when the stable area is wide and with a small radius when the stable area is narrow, and the smaller rated load curve is displayed over the entire circumference of the turn, and the current load is displayed. A load status display device characterized in that points can be displayed simultaneously to predict the safe range in the turning direction.