JP2721113B2 - Rotation stop position control device for earth auger motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation position control device for an earth auger motor.

[0002]

2. Description of the Related Art In the construction of an earth auger machine, when connecting or disconnecting an auger screw, first, the auger screw is securely held by a crane or the like, and then the connecting pin is detached and attached by work at a high place.

[0003]

When the rotation of the earth auger motor is stopped, simply turning off the power requires a considerable amount of time to continue the rotation due to inertia and to stop. In order to save this time loss, braking is performed by forcibly performing reverse inching activation.

The stop position of the connection pin, that is, the direction of the hexagonal cross-section joint varies depending on the stop timing, and the connection pin is detached and attached manually from each direction.

SUMMARY OF THE INVENTION An object of the present invention is to provide an earth auger motor rotation stop control device capable of shortening the time required for stopping and controlling the position at the time of stopping, and enabling automatic attachment and detachment of an auger screw. .

According to the present invention, a rotation angle detected portion is provided in a screw joint that is connected to the earth auger motor via the speed reducer block and rotates the auger screw, and detects the position of the rotation angle detected portion. A rotation angle detection unit is provided, and a programmable controller is provided which receives a rotation angle position signal from the rotation angle detection unit, decelerates the rotation of the earth auger motor by a program, and then stops.

It is preferable to connect a ground auger motor to the programmable controller via an inverter control panel, and to connect a disk brake to the motor.

In addition, a magnetic scale is used for the rotation angle detection unit, and a scale detection head is used for the rotation angle detection unit.
It is preferable to detect the circumference of the magnetic scale by dividing it into, for example, about 3000 pulses. Alternatively, a rotary encoder may be connected to the screw joint, and the generated pulse may be used. An optical sensor may be used.

[0009]

In the earth auger motor rotation stop position control device configured as described above, when the programmable controller inputs a position signal of the rotation angle reference point from the rotation angle detection unit, the program rotates the earth auger motor according to a program. Is stopped in a state where the speed is gradually reduced to, for example, about 1/10 every several seconds.

[0010]

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

In FIG. 1, a female screw joint 4 is connected to an earth auger motor 1 via a speed reducer block 2.
The male screw joint 7 of the auger screw 6 is connected by a pair of connecting pins 8 and a commercial power control panel 9 for controlling the rotation stop of the motor 1 is provided as in the conventional apparatus.

In the present invention, a disk brake 10 is connected to the top of the motor 1, and a disk 11 is attached to the screw joint 4. On the outer periphery of the disk 11, a magnetic scale 1 which is a rotation angle detection target is provided.
2 and a reference point detection sensor 13 are provided. A rotation angle detection unit 14 is provided to face the rotation angle detection unit. The rotation angle detection unit 14 includes a scale detection head 15 facing the magnetic scale 12 and a reference point detection sensor 1.
3 and a reference point detection head 16 facing the reference point 3. The scale detection head 15 includes a magnetic scale 12
Is divided into, for example, 3000 pulses and detected. Further, a rotary encoder mechanically connected to the disk 11 may be provided, and a generated pulse may be used, or a proximity switch or an optical sensor may be used. The scale detection head 15 is connected to a reference point detection head 16 via a detector 17 together with a programmable controller 18 having a pulse counter (not shown).

On the other hand, an inverter control panel 19 is provided,
The switches are selectively connected to the earth auger motor 1 or the programmable controller 18 by interlocking changeover switches 20a and 20b.

Next, the control mode will be described.

Normal work is performed by the interlock switches 20a and 20b.
Is located at the position indicated by the dashed line, and the commercial power control panel 9 controls the rotation of the earth auger motor 1. At this time, the position of the reference point detection sensor 13 is constantly detected based on a signal from the reference point detection head 16.

When a stop command is received from the operation panel by a push button or a timer when the auger screw is ready to be automatically attached / detached (FIG. 2), the interlock switch 20a,
20b is switched to the position shown in the figure, and the commercial power control panel 9 is switched to the inverter control panel 19. Then, the programmable controller 18 inputs the position signal of the reference point detection sensor 13 and simultaneously starts pulse counting as shown in FIG. 2, controls the inverter control panel 19 by a program to reduce the rotation of the motor 1 by 1/10. Slow down to a degree. When the number of pulses reaches a preset number, a stop command is output, the inverter control panel 19 shuts off the power, and simultaneously activates the disc brake 10 to prevent overrun of the stop position due to inertia.

FIG. 3 shows another embodiment of the present invention, in which the brake 1 is used for the motor 1 and the disc brake 10 is omitted by using a deceleration means by the motor, the programmable controller 18 is directly connected to the motor 1, and the others are the same as in FIG. This is an example configured as follows.

[0018]

According to the present invention, as described above, the rotation of the motor is gradually reduced, and
The vehicle is stopped in a state where the vehicle is decelerated to a certain degree, the inertial rotation is eliminated, and time loss can be reduced.

Further, since the motor is decelerated and then stopped, there is no unreasonable operation such as reversal inching start, and it is possible to prevent a failure by exerting neither a control circuit nor a mechanical device.

In addition, by controlling the rotational position and always stopping at the same position with high precision, the work of attaching and detaching the connecting pin can be facilitated, and further, mechanization and automation can be performed.

Also, in the present invention, the earth auger motor and the auger screw are in one-to-one correspondence.
Not only a single-axis auger machine but also a multi-axis auger machine driven by one reduction gear block can be implemented by detecting one rotation angle.

The present invention can be applied not only to a single-axis auger machine and a multi-axis auger machine, but also to an excavator in which a rod is added and excavated by a joint method having a polygonal cross section.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing one embodiment of the present invention.

FIG. 2 is a pulse timing chart illustrating control of a programmable controller.

FIG. 3 is an overall configuration diagram showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Earth auger motor 2 ... Reduction gear block 4, 7 ... Screw joint 6 ... Auger screw 8 ... Connecting pin 9 ... Commercial power control panel 10 ... Disc brake 11 ··· Disk 12 ··· Magnetic scale 13 ··· Reference point detection sensor 14 ··· Rotation angle detection unit 15 ··· Scale detection head 16 ··· Reference point detection head 17 ··· Detector 18 ··· Programmable controller 19 ・ ・ ・ Inverter control panel 20a, 20b ・ ・ ・ Interlock switch

Claims (1)

(57) [Claims] 1. A rotation angle detector for detecting the position of a rotation angle detector by providing a rotation angle detector on a screw joint connected to an earth auger motor via a speed reducer block for rotating an auger screw. And a programmable controller for inputting a rotation angle position signal from the rotation angle detection unit, decelerating the rotation of the earth auger motor by a program, and then stopping the rotation of the earth auger motor. Position control device.