JPH08226372A - Rotary drive unit - Google Patents

Abstract

PURPOSE: To increase the number of revolutions at high speed of a rotary drive unit employed in a soil improving machine or the like to rotate an auger screw or the like by providing two two-speed motors each having a high-to-low speed switch, and also providing a series-parallel switch, etc., by which both of the two-speed motors are connected in series or in parallel. CONSTITUTION: When high-to-low speed switches 5 used in a pair of two-speed motors 2, 2 are switched to the low-speed side (right position) and a series- parallel switch 3 opens a parallel side solenoid valve 8 and closes solenoid valves 9, 10, both of the two-speed motors 2 are rotated at low speed, and a main spindle 11 is rotated at low speed via a transmission mechanism 4. Then when each high-to-low speed switch 5 is switched to the low-speed side and the series-parallel switch 3 opens a series-side solenoid valve 8 and closes the solenoid valves 9, 10, both of the two-speed motors 2 are rotated at medium speed. Also when both of the high-to-low speed switches 5 are switched to the high speed side and the series-parallel switch 3 is switched to the series side, both of the two-speed motors 2 are rotated at high speed and the main spindle 11 is rotated at high speed via the transmission mechanism 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a rotary drive device applied to a ground improvement machine or the like and used when rotating an auger screw or the like.

[0002]

2. Description of the Related Art Conventionally, as a rotary drive device of this type,
For example, the one shown in FIG. 2 is known. The rotation drive device 50 includes a high speed / low speed switching device 51 and a second speed motor 52 which is rotated at high speed or low speed by the high speed / low speed switching device 51, and a transmission mechanism (speed reducer) 54 for transmitting power from this to a main shaft 53. ing. Thus, in such a system, when the high / low speed switching device is switched and controlled, the second speed motor is rotated at a high speed or a low speed, and the main shaft is driven at a high speed (for example, the rotational speed ... 5) via the transmission mechanism.
0 rpm, rotational torque ... 460 kgf.m) or low speed (for example, rotational speed ... 25 rpm, rotational torque ... 920 kg)
It is rotated at f ・ m). By the way, in the formation of underground piles and the improvement of soil quality, the higher the speed of rotation of the August Cru and the like, the better the mixing of the soil and the chemicals and the better the formation of the bentonite layer. However, the conventional one has a drawback that the rotation speed at the time of high speed is small because it simply rotates at high speed or low speed by using the two-speed motor.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and was devised to solve the problem. The object of the present invention is to increase the rotational speed at high speed. The present invention provides a rotary drive device.

[0004]

A rotary drive device of the present invention basically comprises two high speed motors, which are provided with a high / low switching device and are rotated at high speed or low speed according to the high / low switching device, and a double speed motor. Alternatively, it is characterized in that it is composed of a serial / parallel switching device connected in parallel and a transmission mechanism for transmitting the power from both two-speed motors to the main shaft.

[0005]

When both the high speed / low speed switching device is set to the low speed side and the serial / parallel switching device is set to the parallel side, the two second speed motors are rotated at low speed and the main shaft is rotated at low speed via the transmission mechanism. If both the high / low speed switching devices are set to the low speed side and the serial / parallel switching devices are set to the series side, or both high / low speed switching devices are set to the high speed side and the serial / parallel switching devices are set to the parallel side,
Both of the two-speed motors are rotated at medium speed, and the main shaft is rotated at medium speed via the transmission mechanism. When both the high / low speed switching devices are set to the high speed side and the serial / parallel switching devices are set to the serial side, the two second speed motors are rotated at high speed, and the main shaft is rotated at high speed via the transmission mechanism. The low-speed rotation corresponds to the conventional low-speed rotation, the medium-speed rotation corresponds to the conventional high-speed rotation, and the high-speed rotation has a rotation speed doubled from the conventional high-speed rotation.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a hydraulic circuit diagram showing a rotary drive device according to an embodiment of the present invention. The rotary drive device 1 is mainly composed of a second speed motor 2, a serial / parallel switching device 3, and a transmission mechanism 4. The two-speed motor 2 is provided with a high / low speed switching device 5 and is rotated at high speed or low speed according to the high / low speed switching device 5. In this example, the second speed motor 2 is a hydraulic motor and is switched to high / low speed by self pressure. The high / low speed switching device 5 has 4 ports 2
It comprises a position type solenoid valve 6 and a shuttle valve 7. The serial / parallel switching device 3 connects the two second speed motors 2 in series or in parallel. In this example, the serial / parallel switching device 3 is constituted by three 4-port 2-position solenoid valves 8, 9 and 10. It is used as a position type solenoid valve, that is, an on-off valve. Although not shown, the oil pressure generation source is connected to the input ports A and B of the serial / parallel switching device 3 via a forward / reverse switching valve. The transmission mechanism 4 transmits the power from the two second speed motors 2 to the main shaft 11, and in this example, the small gear 12 wedged to the output shaft of the two second speed motors 2 and the main gear by meshing with these. The gear mechanism comprises a large gear 13 wedged to the gear 11. This gear mechanism serves as a speed reducer having a speed reduction function.

Next, the operation will be described based on such a configuration. The high / low speed switching device 5 is set to the low speed side (solenoid valve 6 is set to the right position in FIG. 1) and the serial / parallel switching device 3 is set to the parallel side (solenoid valves 8, 9 and 10 are set to the upper position in FIG. 1). 8 closed, solenoid valves 9 and 10
The second speed motor 2 is rotated at a low speed, and the main shaft 11 is rotated at a low speed via the small gear 12 and the large gear 13 of the transmission mechanism 4 (for example, rotation speed ... 25 rpm, rotation torque ... 920 kgf.m). ) Will be done. Both high / low speed switching device 5 is on the low speed side (solenoid valve 6 is at the right position in FIG. 1)
The serial / parallel switching device 3 on the series side (solenoid valves 8, 9,
1 is set to the lower position of FIG. 1 and the solenoid valve 8 is opened and the solenoid valves 9 and 10 are closed), or both high / low speed switching devices 5 are set to the high speed side (solenoid valve 6 is set to the left side position of FIG. 1). To set the serial / parallel switching device 3 to the parallel side (solenoid valves 8, 9 and 10 to the upper position in FIG. 1).
When the solenoid valve 8 is closed and the solenoid valves 9 and 10 are opened), the two second speed motors 2 are rotated at a middle speed, and the main shaft 11 is rotated at a middle speed via the small gear 12 and the large gear 13 of the transmission mechanism 4. Rotation (for example, rotation speed ... 50 rpm, rotation torque ... 460
kgf · m). The high / low speed switching device 5 is set to the high speed side (the solenoid valve 6 is set to the left position in FIG. 1) and the serial / parallel switching device 3 is set to the serial side (the solenoid valves 8, 9, 10 are shown in FIG.
Lower position, the solenoid valve 8 is opened, and the solenoid valves 9 and 10 are closed).
Is rotated at high speed, and the small gear 12 and the large gear 13 of the transmission mechanism 4 are rotated.
The spindle 11 rotates at high speed via the
pm, rotational torque ... 230 kgf · m). The low-speed rotation corresponds to the conventional low-speed rotation, the medium-speed rotation corresponds to the conventional high-speed rotation, and the high-speed rotation has a rotation speed doubled from the conventional high-speed rotation. By switching the forward / reverse switching valve, both second speed motors 2 can be rotated normally or reversely.
Can be reversed.

Although the second speed motor 2, the serial / parallel switching device 3, and the high / low speed switching device 5 are hydraulic in the above embodiment, they are not limited to these and may be, for example, electrical ones. . That is, the second speed motor 2 may be an electric motor, and the serial / parallel switching device 3 and the high / low speed switching device 5 may be electric switching devices. The second speed motor 2 was a self-pressure switching type in the above embodiment,
Not limited to this, for example, an external pressure switching type may be used. The serial / parallel switching device 3 has three solenoid valves 8 to 10 in the previous embodiment.
However, the present invention is not limited to this and may be configured with solenoid valves other than three, for example. Although the transmission mechanism 4 is a gear mechanism in the above embodiment, the transmission mechanism 4 is not limited to this and may be, for example, a chain / sprocket mechanism.

[0009]

As described above, according to the present invention,
The following excellent effects can be achieved. (1) A two-speed motor composed of a two-speed motor, a serial / parallel switching device, and a transmission mechanism, and in particular, two two-speed motors equipped with a high / low speed switching device, and a serial / parallel switching device for connecting these in series or in parallel are provided. Since it is set, the number of rotations at high speed can be increased. As a result, in the formation of underground piles and the improvement of soil quality, the soil and the chemicals are mixed well, and the bentonite layer is also formed well. (2) Since two two-speed motors are provided and they are connected in series or in parallel by the series-parallel switching device, the structure is relatively simple and can be implemented immediately.

[Brief description of drawings]

FIG. 1 is a hydraulic circuit diagram showing a rotary drive device according to an embodiment of the present invention.

FIG. 2 is a hydraulic circuit diagram showing a conventional rotary drive device.

[Explanation of symbols]

1,50 ... Rotation drive device, 2,52 ... Second speed motor, 3 ...
Serial / parallel switch, 4, 54 ... Transmission mechanism, 5, 51 ... High / low speed switch, 6, 8, 9, 10 ... Solenoid valve, 7 ... Shuttle valve, 11, 53 ... Main shaft, 12 ... Small gear, 13 ... Gears, A, B ... Ports.

Claims (1)

[Claims] 1. A two-speed motor provided with a high-low speed switch and rotated at a high speed or a low speed by the high-low speed switch, a series-parallel switch for connecting both the two-speed motors in series or in parallel, and a two-speed motor from the two-speed motor. A rotary drive device comprising a transmission mechanism for transmitting power to a main shaft.