JP2803701B2 - Stand for absolute horizontal maintenance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame for maintaining an absolute level.

[0002]

2. Description of the Related Art For example, in calibration of a sensor, it is required that the calibration be performed in an absolutely horizontal place. But the structure,
Nothing easy to control is provided.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a frame for maintaining an absolute level which always keeps a table horizontal with a simple structure and control.

[0004]

According to the present invention, there is provided a horizontal support base for supporting a horizontal table by a plurality of electromagnetic actuators and maintaining the absolute level of the horizontal table. Provided in
These electromagnetic actuators are constituted by a rotor provided on a horizontal table and an electromagnet for attracting and floating the rotor, and the electromagnetic actuators are connected in parallel by a signal from levelness detecting means provided on the horizontal table. An adder for controlling a plurality of electromagnetic actuators and a control circuit are provided. Further, according to the present invention, a horizontal table is supported by a plurality of electromagnetic actuators, and in a horizontal maintenance stand that maintains the absolute horizontal of the horizontal table, the plurality of electromagnetic actuators are provided on floors having different heights, respectively. These electromagnetic actuators are constituted by a rotor provided on a horizontal table and an electromagnet for attracting and floating the rotor, and the electromagnetic actuators are connected in parallel by a signal from levelness detecting means provided on the horizontal table. An adder for controlling a plurality of electromagnetic actuators and a control circuit are provided.

[0005] It is preferable to use a gyro or an inclination angle sensor as the horizontality detecting means.

[0006]

In the absolute horizontal maintenance stand constructed as described above, the adder adds the minus signal from the gyro based on the deflection signal from the gyro, determines the inclination of the horizontal table, and controls the actuator by the control circuit. In order to control the current flowing through the
The horizontal table is always easily maintained absolutely horizontal.

[0007]

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

1 and 2, a horizontal table 1
Indicates a plurality (three in the illustrated example) of electromagnetic actuators 2
a, 2b, and 2c (hereinafter collectively referred to by reference numeral 2) are supported on the floor F.

The rotor 3 to which the horizontal table 1 of the electromagnetic actuator 2 is fixed is supported by the main body 5 in a non-contact manner by a floating electromagnet 4.

On the other hand, the horizontal table 1 is provided with a gyro 6 as horizontality detecting means, and an adder 7 to which a reference value signal, that is, a table angle 0 ° signal is inputted by a circuit L1.
It is connected to the. The adder 7 is connected to a control circuit 8, to which the levitation electromagnet 4 of the electromagnetic actuator 2 is connected in parallel via a current amplifier 9 by a circuit L2.

Next, the operation will be described.

The electromagnetic table 2 is turned on to lift the horizontal table 1 (step S1), the gyro 6 is started (step S2), and the pitch angle and roll angle of the horizontal table 1 are detected (step S3). Then, the adder 7
The reference value signal of the table angle 0 ° and the minus signal of the pitch angle or the roll angle from the gyro 6 are added to determine whether the pitch angle or the roll angle is not zero (step S).
4). If the pitch angle and the roll angle are zero, step S
3 and if not zero, the control circuit 8 determines the amount of current to the electromagnet 4 of each of the electromagnetic actuators 2a, 2b and 2c (step S5).
The positions of the horizontal table 1 are corrected by controlling the flying heights of the rotors 3a, 2b and 2c, and the horizontal table 1 is returned to the horizontal position (step S6), and the process returns to step S3. Thus, at all times,
Since the horizontal table is maintained horizontal, it is possible to cope with the inclination of the horizontal table 1 due to, for example, mounting a sensor to be calibrated on the horizontal table 1.

FIG. 4 shows another embodiment of the present invention, in which a horizontal table 1 is provided on an electromagnetic actuator 2B having a rotor 3B provided on a floor F, and on a floor F1 higher by a step S. The gyro 6 is supported by an electromagnetic actuator 2A having a low rotor 3A,
This is an example in which the electromagnetic actuators 2A and 2B are connected to the electromagnets for attracting and floating through a control circuit 8 and a current amplifier 9. In this embodiment, the operation and effect are the same as those of the above embodiment.

[0014]

The present invention is configured as described above,
The following excellent effects can be obtained. (A) Since the electromagnetic actuator that is attracted and floated is controlled by a signal from the detection means provided on the horizontal table, the control is easy and reliable. (B) The structure is simple and the cost is low. (C) Therefore, sensor calibration and the like can be easily and reliably performed regardless of the location.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a side sectional view of an electromagnetic actuator.

FIG. 3 is a control flowchart.

FIG. 4 is a front view showing another embodiment of the present invention.

[Explanation of symbols]

 F, F1 floor S step 1 horizontal table 2, 2A, 2B electromagnetic actuator 3, 3A, 3B rotor 4 floating electromagnet 5 body 6 ... Gyro 7 ... Adder 8 ... Control circuit 9 ... Current amplifier

Continuing on the front page (72) Inventor Yuichi Izaki Kashima Construction Co., Ltd. 1-2-7 Moto-Akasaka, Minato-ku, Tokyo (72) Inventor Hiroshi Koshida 2-9-1-1, Tobita-Ken, Chofu-shi, Tokyo Kashima Construction Co., Ltd. In-house Research Institute (72) Inventor Yasuo Ogawa 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Katsuhisa 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. In-company (72) Inventor Atsuo Minemura 2-9-1-1, Tobita-Sen, Chofu-shi, Tokyo Kashima Construction Co., Ltd.Technical Research Institute (56) References JP-A-58-25637 (JP, A) JP-A-58-12527 (JP, B2) (58) Field surveyed (Int. Cl. ⁶ , DB name) G12B 5/00

Claims (2)

(57) [Claims] A horizontal table supported by a plurality of electromagnetic actuators for maintaining an absolute level of the horizontal table, wherein the plurality of electromagnetic actuators are provided on the same floor, and the electromagnetic actuators are arranged on a horizontal table. And an electromagnet that attracts and floats the rotor, and controls the plurality of electromagnetic actuators connected in parallel by a signal from levelness detection means provided on each of the horizontal tables. An absolute horizontal maintenance stand characterized by being provided with an adder and a control circuit. 2. A horizontal support base for supporting a horizontal table with a plurality of electromagnetic actuators and maintaining the absolute level of the horizontal table, wherein the plurality of electromagnetic actuators are provided on floors having different heights, respectively. The actuator includes a rotor provided on the horizontal table and an electromagnet for attracting and floating the rotor. The plurality of electromagnetic actuators are connected in parallel by a signal from a level detection unit provided on the horizontal table. An absolute level maintaining base, comprising an adder for controlling an actuator and a control circuit.