JPS6411778B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a trench excavator used on hard roadbeds, and in particular, a boom that rotatably supports a rotary cutter having a cutting blade on its circumference is equipped with a wheel or shoe at the tip. The arm is pivoted to excavate continuous trenches in concrete and rock.

Conventionally, cutting with a concrete cutter, crushing with a pneumatic or hydraulic breaker, or crushing with a ripper has been used for trench work on concrete or asphalt roadbeds, trench excavation work on hard roadbeds such as bedrock, and repair work on airport runways. Excavation work was partially carried out using methods such as crushing using a scissor-type crusher.

However, when using a scissor type crusher, breaker, or ripper, it is difficult to accurately crush a predetermined area due to propagation of cracks, and when using a concrete cutter, the cutting depth is shallow and requires stepped cutting. However, the cutting speed is slow and the life of the cutter is short.

This invention solves the above-mentioned problems of trench excavation in hard roadbeds. SUMMARY OF THE INVENTION An object of the present invention is to provide a trench excavator that is powerful and has a high excavation speed when excavating hard roadbeds. A further object of the invention is to provide a machine for
To provide a trench excavator with constant excavation resistance and a stable machine body.

That is, in this application, as in the illustrated embodiment, one end 3a of a boom 3 is pivotally connected to a support 2 of a traveling trolley 1 so as to be able to rise and fall, and a digging blade is provided on the other end 3b of the boom 3 on the circumference. A body stabilizing arm 6 rotatably supporting the rotary cutter 4 and having a wheel 5 or a shoe at its tip is attached to the boom 3,
Angle detectors 11 and 12 are provided which are pivotably mounted to allow elevation and elevation and detect elevation angles α and β of the boom 3 and arm 6, respectively, and an excavation depth Hd is set on the driver's cab of the traveling truck. a comparison calculator 14 to which the angle detectors 11, 12 and the setting device 13 are connected and which inputs the detection signals and setting signals to perform calculation comparison;
is connected to the control device 15, which operates the elevating cylinders 7, 8 of the boom 3 and the arm 6 based on the output signal to keep the excavation depth Hd constant;
The specified invention is a trench excavator characterized in that it is provided with a boom 3, in which one end 3a of a boom 3 is pivotally connected to a support base 2 of a traveling truck 1 so as to be able to move up and down, and the other end 3a of the boom 3 is
b, a rotary cutter 4 provided with a digging blade on the circumference is rotatably supported, and an arm 6 for stabilizing the aircraft body having a wheel 5 or a shoe at the tip is pivoted to the boom 3 so as to be able to move up and down. a rotation speed detector 21 for detecting the rotation speed of the rotary cutter 4;
In addition, a rotation speed setting device 22, the rotation speed detector 21, and the rotation speed setting device 22 are connected to the driver's cab of the traveling bogie 1, and the detection signal and the setting signal are inputted and compared. Comparison calculator 2 to calculate
3, and a control device 24 to which the comparator 23 is connected and which controls a traveling drive device (not shown) of the traveling truck based on the output signal thereof. do.

The present invention will be explained below with reference to the attached drawings.
FIG. 1 is a side view of a trench excavator according to an embodiment of the present invention, in which one end 3a of a boom 3 is pivotally attached to a support 2 provided on a traveling truck 1. As shown in FIG. A rotary cutter 4 is attached to the other end 3b of the boom 3.
is pivotally supported, and the arm 6 is pivotally attached. Elevation cylinders 7 and 8 are installed between the support base 2 and the boom 3 and between the boom 3 and the arm 6, respectively, and the boom 3 and the arm 6 can be elevated by expanding and contracting the cylinders. . A wheel 5 is rotatably supported at the tip of the arm 6. This wheel 5 is in contact with the ground surface during excavation,
This is to keep the height Hs of the tip of the arm 6 constant, and other types such as a shoe may also be used. The rotary cutter 4 is a disc-shaped cutter having a constant width, and a cutting blade made of carbide chips is provided on the circumference thereof. This rotary cutter 4 is rotated by a hydraulic drive device M. The hydraulic drive device M may be directly connected to the rotating shaft of the rotary cutter 4, or may be placed separately and applied rotation via a chain or the like as shown in the figure.

To perform the excavation work, the boom 3 is lowered to a predetermined excavation depth Hd while rotating the rotary cutter 4 in the direction A in the figure, and the traveling cart 1 is caused to travel.
The excavated layers are deposited on both sides of the trench. At this time, in order to carry out efficient continuous excavation, it is necessary to control the traveling speed of the traveling carriage so that the rotational speed of the rotary cutter 4 does not decrease due to excavation resistance. In addition, in order to prevent the traveling cart 1 from tilting due to the excavation reaction force of the rotary cutter 4 and to prevent fluctuations in the excavation depth Hd, the arm 6 is lifted up and the wheel 5 provided at the tip is placed on the ground to a predetermined position. It is necessary to maintain the height.

Here, in order to keep the excavation depth Hd constant, Hs: Height of the wheel 5 Ho: Height of the pivot point 3a of the boom 3 L1: Length of the boom 3 L2: Length of the arm 6 R: Rotation radius α of rotary cutter 4: Elevation angle β of boom: Elevation angle of arm, Hd=L1sinα+R−Ho…(1) Hd=R−L2sin(α−β)−Hs…(2) satisfies the conditions. In order to do this, the boom 3 and arm 6 may be controlled. FIG. 2 shows this control system. Angle detectors 11 and 12 are attached to the boom 3 and the arm 6 to detect respective elevation angles α and β, and these angle detectors 11 and 12 are connected to a comparator 14. Further, a setting device 13 for setting a predetermined excavation depth Hd is provided, and is connected to a comparator 14. When the setting device 13 sets the excavation depth Hd, the angle detectors 11 and 12 detect the elevation angles α and β, and each signal is input to the comparator 14, equations (1) and (2) are obtained. ) according to the formula,
L1sinα+R−Ho and R−L2sin(α−β)−Hs
is calculated and compared with Hd to output a control signal.
Cylinder 7, 8 for elevating boom 3 and arm 6
The output side of the comparator 14 is connected to the control devices 15 and 16 that control the control devices 15 and 16.
16 controls the elevation of the boom 3 and the arm 6 in response to a control signal from the comparator 14.

The setting device 13, the comparator 14, and the control devices 15 and 16 are connected to the driver's cab of the traveling bogie 1 (not shown).
It is set in.

FIG. 3 shows the overall control system for the traveling speed of the traveling trolley 1. As shown in FIG. A rotation speed detector 21 for detecting the rotation speed of the rotary cutter 4 and a rotation speed setting device 22 are provided and connected to a comparison calculator 23 . When the optimum rotational speed is set in the rotational speed setting device 22 according to the excavation target, the setting signal and the detection signal of the rotational speed detector 21 are inputted to the comparator 23 and compared, and a control signal is output. The control device 24 that controls the traveling drive device of the traveling bogie 1 includes a comparison calculator 23.
is connected to the output side of the comparator 23, and receives a control signal from the comparator 23 to control the traveling speed of the traveling bogie 1.

The rotation speed setting device 22, the comparison calculator 23, and the control device 24 are connected to the driver's cab (not shown) of the traveling bogie 1.
It is set in.

The trench excavator of the present invention can apply a strong excavating force to the rotary cutter 4 by the hydraulic drive device M, and controls the boom 3 and arm 6 to reach the excavation depth Hd.
can be maintained constant and stabilize the aircraft.
When the excavation resistance increases and the rotational speed of the rotary cutter 4 decreases, the traveling speed can be controlled to prevent the excavation ability from decreasing. Therefore, it is possible to facilitate the work of trench excavation of reinforced concrete roads, hard roadbeds such as bedrock, concrete joint construction, cable burying, and road repair work. Furthermore, it is possible to contribute to the promotion of prefabricated road repair work, which is difficult to speed up the work.

[Brief explanation of the drawing]

Fig. 1 is an explanatory front view of a trench excavator according to an embodiment of the present invention, Fig. 2 is a block diagram showing a control system for the boom and arm, and Fig. 3 is a control system for the running speed of the traveling truck. FIG. In the figure, 1 is a traveling trolley, 2 is a support base, 3 is a boom, and 4
is a rotary cutter, 5 is a wheel, 6 is an arm,
7 and 8 are cylinders for elevation, 11 and 12 are angle detectors, 13 is a setting device, 14 and 23 are comparison calculators, 1
5, 16, and 24 are control devices, 21 is a rotation speed detector, and 22 is a rotation speed setter.

Claims (1)

[Scope of Claims] 1. One end of a boom is pivotably mounted on a support of a traveling truck so that it can be lifted up and down, and a rotary cutter having a digging blade provided on the circumference is rotatably supported on the other end of the boom, and A body stabilizing arm having a wheel or a shoe at its tip is pivotally attached to the boom so that it can be lifted up and down,
An angle detector is provided to detect the elevation angle of each of the boom and the arm, and a setting device for setting the excavation depth is connected to the cab of the traveling truck, and the angle detector and the setting device are connected to detect the angle. A comparator is connected to a comparator that inputs a signal and a setting signal and performs a calculation comparison, and the output signal operates the cylinder for elevating the boom and arm to maintain a constant excavation depth. A trench excavator characterized by being equipped with a control device. 2. One end of a boom is pivotably mounted on a support of a traveling truck so that it can be lifted up and down, and a rotary cutter with a digging blade provided on the circumference is rotatably supported on the other end of the boom, and a wheel or The arm for stabilizing the aircraft is equipped with a shoe at the tip, and is pivoted so that it can be lifted up and down.
A rotation speed detector for detecting the rotation speed of the rotary cutter is provided, and a rotation speed setting device for setting the rotation speed of the rotary cutter is provided in the driver's cab of the traveling trolley, and the rotation speed detector and the rotation speed setting device are provided. A comparator is connected to input the detection signal and the setting signal and performs a comparison calculation, and a control device is connected to the comparator and controls the travel drive device of the traveling bogie based on the output signal of the comparator. A trench excavator characterized by: