JP2871105B2 - Safety equipment for dismantling work machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a dismantling work machine equipped with a work attachment having a large overall length.

[0002]

2. Description of the Related Art FIG. 4 is a side view of a conventional dismantling work machine 1. As shown in FIG. In the drawing, reference numeral 2 denotes a vehicle body of the dismantling work machine 1, reference numeral 3 denotes a lower traveling body of the vehicle body 2, reference numeral 4 denotes an upper revolving body of the vehicle body 2, reference numeral 5 denotes a work attachment mounted on a front portion of the upper revolving body 4, and reference numeral 6 denotes a work attachment 5. Boom, 7 is an arm,
8 is a crusher, 9, 10, and 11 are hydraulic cylinders, respectively.
G1 is the position of the center of gravity of the vehicle body 2, G2 is the work attachment 5
G3 is the position of the center of gravity of the dismantling work machine 1 as a whole;
Reference numeral 2 denotes a front stability fulcrum of the dismantling work machine 1, 13 denotes a rear stability fulcrum, R1 denotes a support force at the front stability fulcrum 12, and R2 denotes a support force at the rear stability fulcrum 13. In a dismantling work machine 1 for dismantling a building such as a building, a work attachment 5 in which a boom 6, an arm 7 and a crushing machine 8 are connected in a movable manner so as to be able to perform a bending work is mounted on a front portion of an upper rotating body 4.

[0003] The dismantling work machine 1 is provided with a work attachment 5 having a large overall length for performing dismantling work of a high place such as a building. Therefore, when the boom 6 and the arm 7 are rotated forward as indicated by the imaginary line A in FIG. 4, the position of the center of gravity of the work attachment 1 moves from the original position G2 to G2 '. In this case, the center of gravity G1 of the vehicle body 2 does not change, but the center of gravity of the entire dismantling work machine 1 moves from the original position G3 to G3 '. Accordingly, the supporting force R2 of the rear stable fulcrum 13 on the ground contact surface of the lower traveling body 3 decreases. When the value of the supporting force R2 becomes equal to or less than the limit value for ensuring safe work,
There is a risk that the dismantling work 1 may fall forward. In the prior art safety device, a safety angle is set with respect to the boom angle (the angle θ1 shown in FIG. 4) and the arm rotation angle (the angle θ2 shown in FIG. 4), and the set angle is set. There is also a structure (not shown) that issues an alarm when the distance exceeds the limit. In this case, since the safety angle cannot be set for each of the innumerable combinations of the boom angle and the arm rotation angle, a rough safety position must be set, and The working range had to be smaller. Also, during the operation, I did not know how much stability the dismantling machine had, and I was worried.

[0004]

The problems to be solved are that when operating the work attachment of the dismantling work machine, the driver does not know the stability of the dismantling work machine at that time, and the dismantling work machine has a problem. There is a risk of falling.

[0005]

According to the present invention, an angle detector is provided on each of a boom and an arm, and a controller is provided on a vehicle body, and a detection signal from the angle detector is input to the controller, whereby the detection signal is obtained. Based on the controller, the center of gravity position of the entire dismantling work machine and the supporting force of the stable fulcrum on the ground contact surface of the lower traveling body of the vehicle are calculated, and the supporting force value at the stable fulcrum based on the calculation result is displayed on a display. I did it. In addition, an alarm is issued when the supporting force at the rear stable fulcrum of the ground contact surface of the lower traveling vehicle becomes less than a limit value for ensuring safe work.

[0006]

FIG. 1 is a side view of a dismantling work machine 14 provided with a safety device according to the present invention. In the figure, the same reference numerals are given to components using the same components as the conventional technology. 2 '
Is the body of the dismantling work machine 14, 4 'is the upper swing body, 5' is the work attachment, 6 'is the boom, 7' is the arm, 15
Is an angle detector provided on the boom 6 ', 16 is an angle detector provided on the arm 7', 17 is a controller provided on the upper swing body 4 'of the vehicle body 2', 18 is a display, 19 is an alarm, G
A is the position of the center of gravity of the vehicle body 2 ', GB is the position of the center of gravity of the work attachment 5', GC is the position of the center of gravity of the entire dismantling work machine 14, R1 'is the supporting force of the front stable fulcrum 12, and R2' is the support of the rear stable fulcrum 13. Power. FIG. 2 is a block diagram showing functions of the controller 17 in FIG. In the figure, reference numeral 20 denotes a memory of the controller 17. The memory 20 includes a movement pattern of the center of gravity position GB of the work attachment 5 ′ due to the turning operation of the boom 6 ′ and the arm 7 ′, a movement pattern of the center of gravity GC of the entire dismantling work machine 14, and a movement pattern thereof. The corresponding supporting force pattern is stored. Since the stability of the lower traveling body 3 of the vehicle body 2 'in the left-right lateral direction is worse than that in the vertical direction, it is safe to set the lateral-lateral supporting force pattern as the above-mentioned supporting force pattern. FIG. 3 is a diagram showing the relationship between the weight W of the dismantling work machine 14 in FIG. 1 and the supporting forces R1 ′, R2 ′. In the figure, L is a forward stable fulcrum 12
, The distance from the front stable fulcrum 13 to l,
The distance m on the horizontal projection plane between the entire center of gravity GC and the front stable fulcrum 12 is the distance on the horizontal projection plane between the center of gravity GC of the entire dismantling work machine 14 and the rear stable fulcrum 13. Therefore, the supporting forces R1 'and R2' in FIG.
Are given by the following equations: R1 ′ = W × m / L and R2 ′ = W × l /
L.

Next, the configuration of the safety device according to the present invention will be described with reference to FIGS. Boom 6 'and arm 7'
Are provided with the angle detectors 15 and 16, respectively, and the upper revolving unit 4 'is provided with the controller 17. By inputting the detection signals from the angle detectors 15 and 16 to the controller 17, the controller 17 is provided based on the detection signals. And the center of gravity GC of the entire dismantling work machine 14 and the lower traveling body 3
Front fulcrum 12 and rear stability fulcrum 1 on the ground contact surface
3, the support forces R1 'and R2' are calculated, and the support force values at the fulcrums 12, 13 based on the calculation results are displayed on the display 18. Also,
When the supporting force R2 'at the rear stability fulcrum 13 falls below the limit value for ensuring safe operation, an alarm is issued from the alarm device 19. The display 18 may display only the supporting force value at the rear stability fulcrum 13. The alarm device 19 is a buzzer that emits an alarm sound, or an alarm lamp that emits light.

Next, the operation of the safety device of the present invention will be described. When the work attachment 5 'of the dismantling work machine 14 is operated, the angle detectors 15 and 16 are respectively turned to the boom 6'
And the angle of the arm 7 'with respect to the ground, for example. Then, the detection signal is input to the controller 17. The controller 17 calculates the center of gravity position GB of the work attachment 5 'and the center of gravity position GC of the entire dismantling work machine 14 based on the detection signal. Then, the support forces R1 ′ and R2 ′ of the front stability fulcrum 12 and the rear stability fulcrum 13 on the ground contact surface of the lower traveling body 3 are calculated. A display command signal is output from the controller 17 to the display 18 based on the calculation result. In response to the display command signal, the display 18 displays the supporting force values at the stable fulcrums 12 and 13 (actual supporting force values may be displayed.
(It may be displayed as a percentage value set to 0).
Thereby, the driver recognizes the displayed value, avoids the risk of the dismantling work machine 14 falling over, and can perform safe work. Further, as a result of the calculation by the controller 17, when the supporting force R2 'of the rear stable fulcrum 13 becomes equal to or less than the limit value for ensuring the safe operation, the controller 17 outputs an alarm command signal to the alarm device 19. The alarm 19 issues an alarm according to the alarm command signal. Thus, even if the driver does not check the display value on the display 18, the driver can prevent the dismantling work machine 14 from falling over.

[0009]

As described above, according to the present invention, an angle detector is provided on each of a boom and an arm, and a controller is provided on a vehicle body, and a detection signal from the angle detector is input to the controller. The controller calculates the center of gravity of the entire dismantling work machine and the supporting force of the stable fulcrum on the ground contact surface of the lower vehicle body based on the controller, and displays the supporting force value at the stable fulcrum based on the calculation result on the display As a result, the driver recognizes the displayed value, avoids the risk of the dismantling work machine falling over, and can perform safe work. In addition, a warning is issued when the support force at the rear stability fulcrum falls below the limit value for ensuring safe work, so even if the driver does not check the display value on the display, the driver can perform dismantling work. It is possible to prevent the machine from overturning.

[Brief description of the drawings]

FIG. 1 is a side view of a dismantling work machine equipped with a safety device of the present invention.

FIG. 2 is a block diagram illustrating functions of a controller in FIG. 1;

FIG. 3 is a diagram showing a relationship between a weight and a supporting force of the dismantling work machine in FIG. 1;

FIG. 4 is a side view of a conventional dismantling work machine.

[Explanation of symbols]

 1,14 Demolition work machine 2,2 'Body 3 Lower running body 4,4' Upper revolving body 5,5 'Work attachment 6,6' Boom 7,7 'Arm 12,13 Support point 15,16 Angle detector 17 Controller 18 Display 19 Alarm

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-72333 (JP, A) JP-A-59-82294 (JP, A) JP-A-62-248724 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) E02F 9/24

Claims (2)

(57) [Claims] 1. A dismantling work machine in which a boom, an arm, and a crushing machine are connected to each other so as to be capable of bending work to form a work attachment, and the work attachment is mounted on a front portion of a vehicle body. An angle detector and a controller are provided on the vehicle body, and a detection signal from the angle detector is input to the controller. Based on the detection signal, the controller determines the center of gravity of the entire dismantling work machine and the lower traveling body of the vehicle body. A supporting force of the stable fulcrum on the ground contact surface of the vehicle, and a supporting force value at the stable fulcrum based on the calculation result is displayed on a display. 2. A safety device for a dismantling work machine according to claim 1, wherein an alarm is issued when a supporting force at a rear stable fulcrum becomes equal to or less than a limit value for ensuring safe work. Characteristic safety equipment for dismantling work machines.