JPH0224993B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an excavation control method in an earth auger machine.

As shown in FIG. 1 as an example, the earth auger machine includes an outer auger 1 consisting of a casing having a cutting edge 1a at its tip, and an inner auger 2 consisting of an auger screw inserted into the outer auger 1. The inner auger drive part 5 is movable up and down with respect to the outer auger drive part 3 by means of cylinders 4 and 4' having one end fixed on the outer auger drive part 3 connected to the root end of the outer auger 1. is supported by. Incidentally, although not shown in the drawings, a driving motor is provided in the driving sections 3 and 5.

These augers 1, 2 and drive parts 3, 5 are connected to a wire 8 whose one end is fixed to a support 6 such as a leader mast, and whose other end can be wound up by an elevating winch 7.
It is suspended via a sheep 9 so that it can be raised and lowered freely.

During excavation, both augers 1 and 2 are inserted into the ground by their own weight, but if they hit a boulder layer or bedrock layer and the digging force is insufficient with their own weight alone, a third winch is used to forcibly apply retraction force. Guide wire 11 from 10 to guide sheave 1
2 to the lower surface of the outer auger drive section 3.

In the figure, 13 and 13' are the guide sheaves of the wire 8, 2a is the cutting edge of the auger 2, and 14 is a wire for detecting the excavation depth and excavation speed.
It consists of an endless body that is hung around upper and lower fixed pulleys 15, 15', and a part of it is fixed, for example, to the back of the outer auger drive unit 3, and moves together with the augers 1, 2.

The double auger excavator configured in this way excavates by rotating both the outer auger 1 and the inner auger 2 at the same time, and the excavated soil is transported upward by the screw part of the inner auger 2 and discharged outside the machine. be done.

Moreover, when all the set augers 1 and 2 are inserted into the ground, the connection between them and the drive parts 3 and 5 is released, and only the drive parts 3 and 5 are raised by winding up the wire 8 with the lifting winch 7. Then, new augers 1' and 2' are added and further excavation is carried out.

After excavating to a desired depth, the auger 1 can be used as a steel pipe pile.

Conventionally, when using such an earth auger machine, each part was controlled manually using a simple instrument, which was extremely complicated.

Furthermore, the operation of the suspension wire and lead-in wire is required to match the excavation conditions of the press-in machine.

The purpose of the present invention is to automate all of these controls to improve work efficiency, and in particular, to maintain optimal excavation efficiency by automatically controlling the operation of the lead-in wire according to the excavation state of the excavator. An object of the present invention is to provide an excavation control method for an earth auger machine.

Embodiments of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, 16 is the drive motor of the lifting winch 7, 17 is the drive motor of the third winch 10, 1
Reference numerals 8 and 19 are motor control circuits for the drive motors 16 and 17, respectively, and 20 is a motor control circuit for the cylinders 4 and 4'.
This is a control mechanism for operating the telescopic system.

Moreover, 21 is a load meter provided on the wire 8, and measures the load applied to the cutting edge openings 1a and 2a of both the augers 1 and 2. 22 is provided in the cylinder 4 or 4', and the distance between the outer auger 1 and the inner auger 2, more precisely the distance in the auger axial direction between the cutting edges 1a and 2a, depends on the length of the cylinders 4 and 4'. It is a distance meter that measures the distance. Reference numeral 23 is arranged in a power supply circuit to the drive motor of the outer auger drive unit 3, and is an ammeter for measuring the current consumption of the motor, and 24 is arranged in a power supply circuit to the drive motor of the inner auger drive unit 5. , an ammeter that measures the current consumption of the motor. 25
is a retracting force meter, 26, which is provided in the retracting wire 11 and measures the retracting force of the third winch 10;
27 is the wire 14 or the fixed pulley 15 or 1
5' is an excavation depth gauge and speedometer.
These speedometer 27 and depth gauge 26 are provided with a cam switch interlocked with the fixed pulley 15', for example.
The excavation speed may be determined by measuring the interval of output signals from the cam switch, and the excavation depth may be determined by counting the output signals.

In the figure, 28 is a control device consisting of a programmable sequencer or a microcomputer. This control device 28 is connected to the motor control circuits 18, 19 and the control mechanism 20, and the output signal A from the control device 28 is sent to the motor control circuit 18. The output signal B is transmitted to the motor control circuit 19, and the output signal C is similarly transmitted to the control mechanism 20.

On the other hand, the load meter 21, distance meter 22, ammeter 2
Input signals D, E, F, G, H,
Input as I, J.

Figure 2 shows a flowchart. First, when the automatic digging button is pressed, the drive motors of the outer auger drive section 3 and the inner auger drive section 5 are energized, and the outer auger 1 and the inner auger 2 are simultaneously moved in opposite directions. The machine rotates and excavation begins.

During excavation, the excavator sinks due to its own weight, and as a result, the wire 8 is let out from the lifting winch 7, and the wire 11 is wound around the third winch 10. Note that when the stop button is pressed, the lifting winch 7 and the third winch 10 are stopped.

On the other hand, as the excavator advances, the wire 14 and the fixed pulleys 15, 15' move, and along with this movement, the excavation depth is measured by the depth gauge 26, and a depth signal is input to the control device 28.

The control device 28 compares the set depth and the measured excavation depth, and if they match, sends signals A and B containing OFF commands to the motor control circuits 18 and 1.
As a result, the motors 16 and 17 are stopped, and the lifting winch 7 and third winch 10 are also stopped. If the excavation depth does not reach the set depth, signals A and B containing ON commands from the control device 28 are sent.
is output to the motor control circuits 18 and 19, and the lifting winch 7 and the third winch 10 are operated via the motors 16 and 17.

The wire 8 is fed out from the lifting winch 7 in this way when the augers 1 and 2 are inserted into the ground.
1, the load signal D is introduced into the control device 28, and the set value and the measured value of the load meter are compared and calculated.

If the measured value of the load cell is larger than the set value, it means that the entire weight of the excavator is being applied to the wire 8 more than necessary, and conversely, the tips 1a and 2a of both augers 1 and 2 are on the surface of the ground. Indicates that excavation is being carried out with insufficient pressure.

If the measured value of the load meter is larger than the set value, then the signal H that measures the retracting force of the wire 11 from the retracting force meter 25 is input to the control device 28, and the control device 28 measures the actual retracting force meter. Compare the value with the lower limit set value of the set retraction force range. The setting retraction force range is from 4t to 20t.

If the actual retraction force is smaller than the lower limit set value of 4t, the motor control circuit 1
A drive signal B containing an ON command is issued to the wire 11, and the motor 17 and the third winch 10 rotate to apply a tensile force to the wire 11.

As a result, the earth auger machine is pulled downward, and surface pressure from the ground is applied to the cutting edge openings 1a and 2a. If the actual retraction force exceeds the lower limit set value of the set retraction force range, the control device 28 sends a drive signal B to the motor control circuit 19 containing an OFF command.
is issued, and the motor 17 and third winch 10 stop.

On the other hand, if the measured value of the load cell does not reach the set value, the current consumption signal F from the ammeters 23 and 24,
G is input to the control device 28, and the actual total current consumption value of both motors added by the control device 28 is compared with the set current consumption value.

If the actual total current consumption value is larger than the set current consumption value, the control device 28 outputs a drive signal A containing an OFF command to the motor control circuit 18, the motor 16 stops, and the lifting winch 7 also stops. .

When the lifting winch 7 stops, the wire 8 also stops being fed out, and the earth auger machine remains in that state and continues digging.

If the above actual total current consumption value is smaller than the set current consumption value, outer auger 1 and inner auger 2
This means that the excavation load is sufficient or never before. In this case, if the third winch 10 is driven to apply a tensile force to the wire 11 and the earth auger machine itself is retracted, a sufficient digging load will be applied to both augers 1 and 2.

While applying a tensile force to the wire 11 in this way, the measurement signal H from the retracting force meter 25 provided on the wire 11 is introduced into the control device 28, and the actual retracting force of the signal H and the upper limit of the set retracting force range are input. Compare with the set value.

The actual retraction force is the set upper limit of the retraction force (20t)
If it exceeds the limit, the control device 28 issues a drive signal B containing an off command to the motor control circuit 19, and the motor 17 and the third winch 10 are stopped.
As a result, it is possible to prevent excessive tension from being applied to the wire 11.

As described above, the excavation control method of the present invention
The operation of the lead-in wire is automatically controlled according to the excavation status of the earth auger machine to maintain the best excavation efficiency.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the control method of the present invention, and FIG. 2 is a flowchart. 1... Outer auger, 1a... Blade mouth, 2... Inner auger, 2a... Blade mouth, 3... Outer auger drive section, 4, 4'... Cylinder, 5... Inner auger drive section, 6... Support body, 7... Lifting winch, 8
...Wire, 9...Moving pulley, 10...Third winch, 11...Leading wire, 12,13,
13'...Guide roller, 14...Wire,
15, 15'... Fixed pulley, 16, 17... Drive motor, 18, 19... Motor control circuit, 20...
...Control mechanism, 21...Load cell, 22...Distance meter,
23, 24...Ammeter, 25...Retraction force meter, 26
...depth gauge, 27...speed meter, 28...control device.

Claims (1)

[Scope of Claims] 1. Excavation control method in an earth auger machine in which an auger screw is connected to a drive unit that is suspended from a support such as a leader mast so that it can be raised and lowered by a suspension wire and a lead-in wire. A load meter is installed on the hanging wire, and a retraction force meter is installed on the pull-in wire, and the output signals of these load cells and retraction force meter are introduced into the control device, and the measured values of the load cell and retraction force meter are combined with each other. Each set value is compared, and according to the comparison result, a signal from the control device is introduced into the drive motor control circuit of the suspension wire winch and the drive motor control circuit of the drop wire winch, and the operation of these winches is automatically performed. An excavation control method for an earth auger machine, characterized by controlling the earth auger in a controlled and interlocking manner.