JPH07189577A - Rotation stop position control device for earth auger motor - Google Patents

Abstract

PURPOSE:To decelerate the rotation of a motor step by step to lead to its stopping finally by feeding a rotational angle position signal from a screw joint part to a programmable controller. CONSTITUTION:A disc brake 10 is coupled with the top of a motor 1, and a disc 11 is furnished on a screw joint 4. A magnetic scale 12 and a reference point sensor 13 are furnished at the periphery of the disc 11. A scale sensing head 15 confronting the scale 12 and a reference point sensing head 16 facing the reference point sensor 13 are installed in a rotational angle sensing part 14. In conformity to a stop command from the operation panel, interlocking switches 20a, 20b are turned into an inverter control board 19 from a commercial mains control board 9. A programmable controller 18 is fed with a position signal given by the reference point sensor 13, and at the same time, starts counting the pulses, and decelerates the rotation of the motor 1 to approx. 1/10 according to the program. When the set number of pulses is attained, the inverter control board 19 breaks the power, and overrun over the stop position is prevented by the disc brake 10.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In constructing an earth auger machine, when connecting and disconnecting an auger screw, first, the auger screw is securely gripped by a crane, and then the connecting pin is detached by working at a high place.

[0003]

When the rotation of the earth auger motor is stopped, if the power is simply turned off, the rotation of the earth auger motor will continue due to inertia and it will take a considerable time to stop. In order to save this time loss, the inversion inching is forcibly performed for braking.

The stop position of the connecting pin, that is, the direction of the hexagonal section joint varies depending on the stop timing, and the connecting pin is attached and detached by human power from each direction.

An object of the present invention is to provide a rotation stop control device for a motor for an earth auger which can control the position at the time of stop while shortening the time required for stop, and enable automatic attachment / detachment of an auger screw. .

[0006]

According to the present invention, a rotation angle detected portion is provided in a screw joint which is connected to an earth auger motor through a reduction gear block to rotate an auger screw. A rotation detection unit for detecting the detection unit is provided, and a programmable controller for inputting a rotation angle position signal from the rotation angle detection unit to reduce the rotation of the earth auger motor by a program and then stop the rotation is provided.

It is preferable to connect an earth auger motor to the programmable controller via an inverter control board, and connect a disc brake to the motor.

Further, a magnetic scale is used for the rotation angle detection part, and a scale detection head is used for the rotation angle detection part.
It is preferable to detect the circumference of the magnetic scale by dividing it into, for example, about 3000 pulses, but 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 the position signal of the rotation angle reference point from the rotation angle detection portion, the rotation of the earth auger motor is controlled by a program. Is gradually decelerated every few seconds, for example, and is stopped in a state of being decelerated to about 1/10.

[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, and the screw joint 4 is connected to the screw joint 4.
The male screw joint 7 of the auger screw 6 is connected by a pair of connecting pins 8, and a commercial power supply control panel 9 for controlling the rotation stop of the motor 1 is provided as in the conventional device.

In the present invention, a disc brake 10 is connected to the top of the motor 1, and a disc 11 is attached to the screw joint 4. On the outer periphery of the disk 11, the magnetic scale 1 which is a rotation angle detection target
2 and a reference point detection sensor 13 are provided. The rotation angle detection unit 14 is provided so as 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 each other. The scale detection head 15 includes a magnetic scale 12
Is detected by being divided into, for example, 3000 pulses. Further, a rotary encoder mechanically connected to the disk 11 may be provided and the 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 and a programmable controller 18 including a pulse counter (not shown).

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

Next, the control mode will be described.

In the normal operation, the interlock switches 20a and 20b are used.
Is at the position shown by the chain line, and the commercial power supply 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 the signal from the reference point detection head 16.

When the auger screw is automatically detachable, upon receiving a stop command from a push button or a timer from the operation panel (FIG. 2), the interlock switch 20a,
20b is switched to the position shown, and the commercial power supply 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, simultaneously starts pulse counting as shown in FIG. 2, and controls the inverter control panel 19 by a program to rotate the motor 1 1/10. Slow down to a degree. When the number of pulses set in advance is reached, a stop command is output, the inverter control board 19 shuts off the power, and at the same time operates the disc brake 10 to prevent the overrun of the stop position by inertia.

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

[0018]

Since the present invention is configured as described above, the rotation of the motor is decelerated stepwise to reduce the rotation speed to 1/10.
It can be stopped in a state of being decelerated to a certain degree to eliminate inertial rotation and reduce time loss.

Further, since the motor is decelerated and then stopped, there is no unreasonable operation such as reverse inching start, and it is possible to prevent the failure by not overlying the control circuit or the mechanical device.

Further, 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 realized.

Further, in the present invention, the earth auger motor and the auger screw are made to correspond one to one,
Not only a single-axis auger machine, but also a multi-axis auger machine driven by a single speed reducer block can be implemented by detecting one rotation angle.

Further, 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 excavating by adding rods by a joint method of a polygonal section.

[Brief description of drawings]

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

FIG. 2 is a pulse timing chart diagram for explaining control of a programmable controller.

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

[Explanation 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 ... Interlocking switch

Claims (1)

[Claims] 1. A rotation angle detection part is provided in a screw joint for rotating an auger screw which is connected to an earth auger motor via a speed reducer block, and a rotation detection part for detecting the rotation angle detection part is provided. An earth auger motor rotation stop position control device comprising a programmable controller for inputting a rotation angle position signal from the rotation angle detector and decelerating the rotation of the earth auger motor by a program and then stopping the rotation. .