JP3148970B2 - Automatic level gauge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic leveling apparatus mainly used for installing a surveying instrument such as a transit used for general surveying and a theodolite used for geodetic surveying in a completely horizontal state. is there.

[0002]

2. Description of the Related Art In general, many transits and theodolites are provided with a telescope for obtaining a level line and a magnetic needle for obtaining an azimuth angle with respect to magnetic north, but the horizontal accuracy is low. , it is necessary to correct the inclination of the horizontal biaxial direction by manual reciprocating adjustment of the support legs, there is a problem in that lower accuracy specifically to work efficiently even.

[0003] In addition, in a level device for keeping a line of sight of a telescope horizontal and reading a scale of a staff standing vertically at two points to obtain a specific height of the point, an inexpensive general bubble level tube is used. it is, but similar to the above, it is necessary to correct by manual reciprocating adjustment of the support leg at the installation stage, since such a visual check, less accurate, it takes time to horizontal setting, inferior in working efficiency .

Further, there has been developed a sensor in which a plurality of electrode plates are provided in a detection chamber in which bubbles and an electrolyte are sealed, and a sensor for electrically measuring the inclination is attached. Accuracy errors include slight inclination other than the direction, expansion and contraction of the electrolyte due to changes in the ambient temperature of the sensor, changes in the amount of electrolyte contacting the electrode plate due to contraction, and instability of the contact surface due to the surface tension of the electrolyte. There is a problem in that there is a risk of causing errors such as a reproducibility error, a large response time due to a large surface tension of the electrolytic solution, a phenomenon in which bubbles are divided by vibration or the like, and a large error.

[0005] For this reason, recently, the collimation line is automatically leveled accurately by placing an instrument for ensuring high accuracy without using a bubble tube at an almost standard position (about ± 10 '). Equipment has been put into practical use, but there is a problem in that the cost of equipment is increased by attaching such a level device to each equipment.

The present invention can be used commonly for surveying equipment that is required to be installed with high horizontal accuracy, and eliminates error factors while utilizing air bubbles and an electrolyte.
It is an object of the present invention to provide an automatic leveling apparatus capable of ensuring high resolution, high reproducibility, and stable detection, and securing a high level of inclination with zero inclination angle by automatic attitude control.

[0007]

Automatic level table apparatus SUMMARY OF THE INVENTION The present invention is intended to be used as a platform for surveying instrument to be horizontal accuracy requirements, for vertical point irradiated on and the central portion and the plane of the front and back surfaces base to form a hole (1a) (1) and the measurement equipment mounting support plate and (2), Te state odor secured a vertical irradiation space,
Base (1) with respect to the measuring instrument mounting support plate (2) attached at swingably supporting means, the back surface of the instrument mounting for the support plate (2), the levelness of the horizontal orthogonal biaxial directions, alternating A horizontality sensor that is substantially a two-axis horizontal sensor (S3) using a two-axis horizontal sensor (S3) or two single-axis horizontal sensors (S4) that are directly output as an electric signal by a pulse obtained from a power supply (3)
And a motor (M) controlled and rotated so that an analog signal obtained by converting the electric signal from the horizontality sensor (3) becomes zero.
And a horizontal control means (6) having a motion transmitting means (5) for controlling the measuring instrument mounting support board (2) horizontally by the control rotation of the motor (M). Device.

More specifically, purified water as a solvent, magnesium sulfate as a solute, and anhydrous methanol or ethanol as a solution are mixed at a ratio such that the impedance between the electrodes becomes about 40 to 50 KΩ, and the boiling point is obtained. (31) and a bubble (32) are enclosed, and at least the inner surface of the interior wall has a three-dimensional surface roughness of JI.
18K (Au) is applied to the inner bottom part (35) of the electrode installation chamber (34) made of insulating material formed on the high spherical concave part (33) or the enclosing wall (38) having an arc inner peripheral surface of S Rmax 0.2S or less. A common electrode (36) having a uniform surface area by polishing the surface of a metal material having a low ionization tendency such as the like is always pierced to a height that is immersed in the electrolyte (31), and the common electrode (36) is Like the common electrode (36), an even number of peripheral electrodes (37) having a uniform surface area by polishing the surface of a metal material having a low ionization tendency, such as 18K (Au), on the same radial line as the center. , A two-axis horizontal sensor that protrudes higher than the common electrode (36) and has an equal interval and a penetrating vertical length as close as possible to the surface of the spherical concave portion (33).
(S3) or a flatness sensor (3), which is essentially a two-axis horizontal sensor (S3) using two uniaxial horizontal sensors (S4), and a fixed shaft column, the tip of which is a spherical support (10) (11) and a linear motion shaft having a spherical support portion (10) at its tip in two guide hollow columns (13) in which a shaft guide portion elongated hole (12) is radially penetrated in the shaft portion. Two sets of columns (15) supporting the linearly movable 14) and a motor for control
(M) and two sets of mounting brackets (21) are mounted on the back of a measuring instrument mounting support panel (2) provided with a measuring instrument mounting hollow attachment (17) at the center of the plane. Department
(3) is fixed with the air bubble (32) on top, and the fixed column (1)
1) and the two sets of pillars (15) are located at positions where the center of the support panel (2) for measuring instrument mounting forms a triangle with the center of gravity as the center of gravity, and the respective spherical support parts (10) are at the lower ends. The lower end of the fixed shaft column (11) and the two sets of columns (15) are supported by an upright central cylindrical body (18) whose upper end faces below the hollow attachment (17). On the plate (19), fix the sphere support (10) in a state of protruding downward, and
(10) is held and coupled to the base (1) in which the lower base connecting attachment (20) is attached without protruding to the bottom at the center by means allowing only swinging, and the leveling sensor (3) is used. The drive of each of the motors (M) is controlled so that the change in impedance between the electrodes in the two axial directions due to the position of the bubble (32) is directly converted into an electric signal and the analog signal becomes zero, and each rotation is controlled. Is converted into a linear motion and transmitted to each linear motion shaft (14) of the column (15).

[0009]

DETAILED DESCRIPTION OF THE INVENTION AND

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an exploded front view showing a part of an automatic leveling apparatus according to the present invention, and FIG. FIG. 3 is a schematic plan view showing the positional relationship of each part by removing the support board.
Is a cross-sectional view of a two-axis horizontal sensor used as a horizontality sensor, FIG. 4 is a cross-sectional view of the two-axis horizontal sensor, FIG. 5 is an explanatory view of sensor up of the two-axis horizontal sensor, and FIG. FIG. 7 is a cross-sectional view and a plan view of a single-axis horizontal sensor to be used, FIG. 7 is a side view of the single-axis horizontal sensor, and FIG.

[0010] The automatic leveling device of the present invention is characterized in that the horizontality in two directions perpendicular to the horizontal direction is applied to the back surface of a measuring instrument mounting support plate (2) connected to the base (1) by swingable support means. A horizontality sensor (3) using a two-axis horizontal sensor (S3) that is directly output as an electric signal by a pulse obtained from a power supply, and is controlled and rotated by an electric signal from the horizontality sensor (3) The horizontal control means comprising two motors (M) and a motion transmitting means (5) for controlling the support panel (2) for mounting the measuring equipment horizontally by the control rotation of the motor (M) is measured by a measuring means. It is configured to be surrounded by a cover tube (W) fixed to the peripheral surface of the device mounting support board (2).

The base (1) has a vertical point irradiating hole (1a) formed in the center with the front and back surfaces as planes, and the vertical point irradiating hole (1a) is formed on the same radius line with the center of gravity as the center. A sphere support hole (1b) is drilled on the surface side at the apex position of the equilateral triangle to be fixed, a holding plate (1c) for suppressing the vertical movement of the sphere support portion (10) described below is fixed, and the vertical point irradiation is performed. In the hole (1a),
Attachment for lower stand connection with female screw (20a) for connection
(20) has a fixed configuration.

The measuring instrument mounting support plate (2) has a through hole (2a) with a seat in the center with the front and back surfaces being horizontal surfaces, and a mounting operation nut (17b) is attached to a surrounding male screw (17a). The provided hollow attachment (17) for mounting a measuring instrument is fixed.

[0013] Supporting plate for mounting measuring instruments to the base (1)
The swingable support means (2) is composed of a fixed shaft column (11) having a spherical support portion (10) at the tip and an axial guide elongated hole (12) penetrating the shaft portion in the radial direction. Two sets of pillars (15) that support a linear motion shaft (14) with a spherical support part (10) at the tip inside the guide hollow support (13) so as to be able to move linearly and move back and forth in the length direction. And a central cylindrical body whose upper end faces below the hollow attachment (17)
(18) is carried out by the support plate (19) which stands upright.

That is, between the support plate (19) and the back surface of the measuring instrument mounting support plate (2), the fixed shaft column (11) and the two sets of columns (15) are attached to the spherical support portion. (10) is interposed and fixed while projecting below the support plate (19), and the protruding sphere support portion (10) is supported by the respective sphere support holes (1b) of the base (1). Then, the neck of the sphere support portion (10) is fixed by the holding plate (1c) so as to allow only swing.

A measuring instrument for the rotation of two motors (M) supported and fixed by a mounting bracket (21) on the back surface of the supporting panel (2) for mounting the measuring equipment corresponding to the two sets of columns (15). The transmission to the mounting support plate (2) is rotatably held by support shafts (15a) fixed above and below the two sets of columns (15), and the moving nut (2
To the driven-side fixed bevel gear (24) fixed to the rotary screw shaft (23) equipped with 2), to the driven-side bevel gear (26) fixed to the motor shaft (25).
And the translation shaft (14) and the moving nut (22), which constitute the column (15), are integrated with the connecting rod (27), and the moving nut (22) is moved in accordance with the movement of the moving nut (22). The configuration is such that the column (15) moves forward and backward .

[0016] The support plate (2) for mounting the measuring instrument, which is coupled to the base (1), has a center formed on the same radius line with the center of the vertical point irradiation hole (1a) of the base (1) as a center of gravity. Two of the three spherical support holes (1b) at the vertex positions of the triangle are
The spherical support (10) at the tip of the linear motion shaft constituting the linear motion shaft (5), and the spherical support (1) of the fixed shaft column (11) in another spherical support hole (1b).
0) are supported, so that the other two sets of columns (15) are individually advanced and retracted by the control signal from the horizontality sensor (3) described below with the fixed shaft column (11) as the reference height. By controlling and adjusting, the horizontal level of the support panel (2) for mounting the measuring equipment can be secured. Although not shown, the vertical movement of the moving nut (22) is limited by a limit switch provided on the back surface of the support panel (2) for mounting the measuring equipment and the support plate (19).
It is performed by pressing with the operation piece protruding from 2).

Next, a two-axis horizontal sensor (S3) which constitutes a levelness sensor (3) for directly outputting the horizontality in the two directions of the horizontal and orthogonal directions by a pulse obtained from an AC power supply as an electric signal.
3 and FIG. 4, the electrolyte (31)
And the air bubbles (32) are enclosed therein, and at least the inner surface of the upper wall of the room is formed in a spherical concave portion (33) having a high three-dimensional surface roughness.
4) A common electrode (36) having a height constantly immersed in the electrolyte solution (31) is erected through the inner bottom portion (35) in the inner bottom portion (35), and on the same radius line around the common electrode (36). An even number of peripheral electrodes (37) protruding higher than the common electrode (36) are provided at equal intervals and penetrate the spherical recess (33).

More specifically, a concave portion (40) for a substrate is formed with the bottom surface (43) as a horizontal plane, and a concave portion (42) for a liquid chamber is formed at the center of the plane.
Insulating material formed with (for example, polycarbonate etc.)
A common electrode (36) is provided at the center of the inner bottom of the liquid chamber recess (42) of the electrode holder (30) formed from the above, and two horizontal orthogonal axes (X) and (Y) passing through the center of the inner bottom ( 4) and a predetermined radius circle at the intersection of the common electrode (36) and projecting above the common electrode (36) and approaching the surface of the spherical recess (33) of the window plate (41) described later as much as possible. Electrode (36) and uniform four surrounding electrodes
(37) is held in a plant (44) made of polyoxymethylene (for example, a registered trademark of Delrin Dupont), and stands upright and vertically in a liquid-tight manner and is restrained by a regulating body (45). As a result, each front end is projected into the liquid chamber concave portion (42), the rear end is projected from the substrate concave portion (40) toward the bottom surface, and the central portion or the entire surface is a spherical concave portion having a high surface roughness ( A window plate (41) made of an insulating material such as glass formed on the window plate (33), with the spherical concave portion (33) of the window plate (41) as an inner surface and the center coincident with the central axis of the common electrode (36); Hold down the presser screw frame (47) via the packing (46) so that the electrode holder (3
0) is closed in a liquid-tight state, and in the closed liquid chamber concave portion (42), a ratio at which the impedance between the bubbles (32) and the surface tension is small and the inter-electrode impedance is a predetermined value in a horizontal state. And the electrolyte solution (31) mixed with the common electrode (36) is sealed and closed from the sealing port (48) by an amount such that the common electrode (36) is always immersed in the electrolyte solution (31).

In the biaxial horizontal sensor (S3), the common electrode (36) and the peripheral electrode (37) are used by polishing the surface of a metal material having a low ionization tendency, such as 18K (Au), so that the surface area is uniform. Then, as the electrolytic solution (31), purified water as a solvent, magnesium sulfate as a solute, and anhydrous methanol or anhydrous ethanol as a solution were mixed at a ratio such that the impedance between the electrodes was about 40 to 50 KΩ, and the surface was mixed. A material having a low tension, a high boiling point and a low freezing point is used, and the inner surface roughness of the spherical concave portion (33) is JISRmax 0.
Setting to 2S or less is optimal for eliminating error factors and increasing high resolution, reproducibility, and stable detection, but is not limited thereto.

As shown in FIG. 5, the two-axis horizontal sensor (S3) forms a basic pulse of 4 KHz using an oscillator (OSC) and a 1% and 2 KHz duty of 50% by a frequency divider (F / F) as shown in FIG. And pulse amplifier for each pulse
(SP1 to SP4), the antiphase AC pulse (X +, X−, Y +,
Y-) is applied to the surrounding electrode (37), and from the common electrode (36), a signal amplifier circuit (AMP1)
And two amplifier circuits (AMP) with zero drift correction function from variable resistors (VR1) and (VR2).
2), while being pulled into the analog switch (MP) via (AMP3), each of the two different types of pulses from the frequency divider (F / F) is synchronized in the biaxial direction in the logic circuit (G). The analog signals in the two axes separated by the analog switch (MP) are sent to the amplifiers (AMP4) and (AMP5) via the sample and hold circuits (SH1) and (SH2), respectively. Send, output individually from the amplifier (AMP4), (AMP5) as analog signals according to each axis direction,
By controlling the analog signal to zero by the mechanical control unit as described above using the analog signal, it is possible to obtain a high degree of horizontality with a zero inclination angle.

In the above-described embodiment, the level sensor is used.
Although (3) is composed of a two-axis horizontal sensor (S3), it can be used substantially as a two-axis horizontal sensor (S3) using two uniaxial horizontal sensors (S4). The configuration of the single-axis horizontal sensor (S4) will be described with reference to FIGS.

The uniaxial horizontal sensor (S4) is configured such that the inner wall of the electrode disposition chamber (34) for enclosing the electrolyte (31) and the air bubbles (32) is positioned at a point (P) on a vertical line (V) passing through the center. Is obtained by rotating a circular arc line (A) bisected by the vertical line (V) with a predetermined radius centered on a horizontal center line (C) orthogonal to the vertical line (V). It is a rotating body shape, a horizontal center line (C) A cross section perpendicular to the horizontal line is formed in a circular shape, a three-dimensional surface roughness is high JIS Rmax 0.2S or less Enclosure wall (38) and a sealing end body (39) On the electrode holder (30) made of an insulating material (for example, made of polycarbonate or the like), the surface of a metal material having a low ionization tendency, such as 18K (Au), was polished to make the surface area uniform. V)
And a common electrode (36) projecting radially through the electrode arrangement chamber (34) at a position corresponding to the common electrode (36), and at a symmetrical position along the horizontal center line (C) about the common electrode (36). A peripheral electrode (37) projecting radially higher in the electrode installation chamber (34) than the common electrode (36) and having a uniform surface area is penetrated in a liquid-tight state, and the electrode installation chamber ( 34)
The common electrode (36) is always immersed in the electrolyte solution (31) with the electrolyte solution (31) mixed at a ratio where the impedance between the electrodes (32) and the surface tension is small and the inter-electrode impedance is a predetermined value in a horizontal state. Do not touch the air bubbles (32).
(37) are sealed from sealing holes (48) and sealed (49) so that they do not touch the air bubbles (32).

As the electrolyte (31), as in the case of the biaxial sensor, purified water is used as a solvent, magnesium sulfate is used as a solute, and anhydrous methanol or ethanol is used as a solution. ~ 50
Mix at a ratio of about KΩ and use one with a high boiling point and a low freezing point.

The single-axis horizontal sensor (S4), as shown in the sensor up diagram of FIG. 8, converts alternating current into a predetermined 4 KHz basic pulse by an oscillator (OSC), and generates a frequency divider (F / F). Is a 2KHz pulse with a 50% duty, and this pulse is used as a buffer amplifier (SP1) and a buffer amplifier (SP
2) to apply a signal to the peripheral electrode (37) of the uniaxial horizontal sensor (S4), extract a signal from the common electrode (36) to the signal amplifier circuit (AMP1) and extract the output from the variable resistor (VR1). ) To the analog switch (MP) via the amplifier circuit (AMP2) having a zero drift correction function, and the synchronization signal from the frequency divider (F / F) is pulled into the analog switch, and the analog switch is synchronized. The analog signal is sent to the amplifier (AMP3) via the sample and hold circuit (SH1), and the amplifier (AMP3) outputs a predetermined analog signal according to the inclination, and the analog signal controls the motor (M) for control. Means for driving in reverse rotation can be employed, but is not limited thereto.
It can be replaced by known conversion means.

In the embodiment described above, the base (1)
A fixed shaft column (11) with a spherical support (10) at the tip as a swingable support means for the support panel (2) for mounting measuring instruments to
And a linear motion shaft (1
4) linearly movable support was such that forward and backward in the longitudinal direction the two sets of pairs pillars (15), the spherical supporting portion of the tip (10) foundation
(1) Hold the other end of each column with a support plate for mounting measuring equipment
Although the configuration fixed to the back surface of (2) has been described, the spherical support (10) may be held on the back surface of the support plate (2) for mounting the measuring device, or the support plate (2) for mounting the measuring device. A known motion transmitting means such as a means for screwing a screw shaft directly connected to a motor shaft to a swing nut rotatable about a horizontal axis on the back surface of the measuring device can be adopted.
It is necessary to prevent members other than the measuring instrument mounting member from protruding from the mounting surface, which is the surface of (2) .

[0026]

The automatic leveling apparatus of the present invention described above is intended to be used as a stand for a surveying instrument requiring horizontal accuracy, and has a flat front and back surface and a vertical point at the center. Mounting the measuring equipment by swinging the base (1) with the irradiation hole (1a) formed thereon and the support panel for mounting the measuring equipment (2) to the base (1) while securing the vertical irradiation space A two-axis horizontal sensor (S3) or two single-axis horizontal sensors (S3) in which the horizontality in the horizontal orthogonal biaxial direction is directly output as an electric signal by a pulse obtained from an AC power supply on the back side of the support board (2). A levelness sensor (3), which is substantially a two-axis horizontal sensor (S3) using (S4), and an analog signal obtained by converting an electric signal from the levelness sensor (3) is controlled to be zero. The motor (M) to be rotated and the control rotation of the motor (M) make the measuring instrument mounting support plate (2) horizontal. Since the horizontal control means (6) having the motion transmitting means (5) for controlling is provided, the supporting plate for mounting the measuring device (2) which is swingably supported.
The change in impedance between the electrodes, which changes depending on the position of the bubble (32) of the two-axis horizontal sensor (S3) or two single-axis horizontal sensors (S4) supported and fixed on the back surface of the An analog signal is output as an information signal, and the mechanical control means uses the analog signal so that the analog signal is reduced to zero so that a support panel for mounting a measuring instrument is provided.
(2) Automatically, accurately and quickly control the level, and automatically control and adjust the surveying equipment such as transit and the theodolite, which are supported and fixed, to the perfect horizontal state. Accurate measurement can be performed efficiently.

In particular, the two-axis horizontal sensor (S3) or two single-axis horizontal sensors (S4) constituting the horizontality sensor (3) are connected to the common electrode (36) at the right and left or on the same radial line (X ),
A surrounding electrode (37) is provided in the (Y) direction, and the surface of a metal material having low ionization tendency, such as 18K (Au), is polished to make the surface area uniform, and purified water is used as a solvent as an electrolyte (31). ,
Magnesium sulfate as a solute and either anhydrous methanol or anhydrous ethanol as a solution are mixed at a ratio that gives an impedance between the electrodes of about 40 to 50 KΩ, and those with a low surface tension, a high boiling point and a low freezing point are used. ,
Furthermore, the surface roughness of the inner surface of the spherical concave portion (33) or the surrounding wall (38) is
By using a structure with Rmax 0.2S or less, errors such as slight inclination other than the axial direction to be measured and expansion and contraction of the electrolyte (31) due to changes in the ambient temperature of the sensor Changes in the amount of contact of the electrolyte (31) with the electrode plate, instability of the contact surface due to the surface tension of the electrolyte (31), etc. are eliminated, and air bubbles (3
Since the occurrence of the splitting phenomenon of 2) is prevented, the danger of generating large errors, accuracy errors and errors of reproducibility are also eliminated, and the inclination angle of surveying equipment such as transit and geodetic survey used for geodetic survey It is possible to quickly set a completely horizontal state of zero, thereby enabling accurate measurement under high working efficiency.

[Brief description of the drawings]

FIG. 1 is an exploded front view showing a part of an automatic level device according to the present invention in a cutaway manner.

FIG. 2 is a schematic plan view showing a positional relationship between respective parts of the automatic leveling apparatus according to the present invention, with a supporting plate for mounting measuring instruments removed.

FIG. 3 is a sectional view of a two-axis horizontal sensor used as a horizontality sensor.

FIG. 4 is a cross-sectional view of a two-axis horizontal sensor used as a horizontality sensor.

FIG. 5 is an explanatory diagram of sensor up of a two-axis horizontal sensor.

FIG. 6 is a cross-sectional view of a uniaxial horizontal sensor used as a horizontality sensor.

FIG. 7 is a side view of a one-axis horizontal sensor used as a horizontality sensor.

FIG. 8 is an explanatory diagram of a sensor up of the one-axis horizontal sensor.

[Explanation of symbols]

 (1) Base (2) Support plate for mounting measurement equipment (3) Horizontality sensor (S3) Two-axis horizontal sensor (S4) Single-axis horizontal sensor (M) Motor (5) Motion transmission means (10) Spherical support ( 11) Fixed shaft column (12) Slotted guide hole (13) Hollow column for guide (14) Linear shaft (15) Assembly column (17) Hollow attachment (18) Central cylinder (19) Support plate (20) Lower base connection (21) Mounting bracket (22) Moving nut (23) Rotating screw shaft (24) Drive-side fixed bevel gear (25) Motor shaft (26) Drive-side bevel gear (27) Connecting rod (30) Electrode holder ( 31) Electrolyte (32) Bubbles (33) Spherical recess (34) Electrode installation chamber (35) Inner bottom (36) Common electrode (37) Peripheral electrode (38) Surrounding wall (39) Sealing end plate (40) Substrate (41) Window plate (42) Recess for liquid chamber (43) Bottom surface (44) Planting body (45) Regulator (46) Packing (47) Holding screw frame (48) Sealing port (49) Sealing plug (V ) Vertical line (A) Arc line (C) Horizontal center line (P) Point

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01C 15/00 101-15/14 G01C 9/00-9/36

Claims (6)

(57) [Claims] An electrolytic solution (31) and air bubbles (32) are sealed, and at least the inner surface of the upper wall of the room has a spherical concave portion (3) having a high three-dimensional surface roughness.
In the inner bottom part (35) of the electrode holder (30) in which the electrode disposition chamber (34) made of an insulating material formed in (3) is formed, the common electrode (36) is always immersed in the electrolyte (31). ), And an even number of peripheral electrodes (37) protruding higher than the common electrode (36) are arranged at equal intervals on the same radius line around the common electrode (36), and the spherical surface is formed. A two-axis horizontal sensor (S3) substantially using a two-axis horizontal sensor (S3) or two single-axis horizontal sensors (S4) vertically penetrating as a length as close as possible to the surface of the recess (33) A horizontal level sensor (3), a fixed shaft column (11) with a spherical support (10) at the tip, and two axial guide holes (12) that extend through the shaft in the radial direction. Linear guide shaft (14) with a spherical support (10) at the tip inside the guide hollow support (13)
The two sets of columns (15) that support the motor directly and the two sets of mounting brackets (21) that support the control motor (M) are mounted at the center of the plane with a hollow attachment (17) for mounting measuring instruments. ) Is provided on the back of the measuring instrument mounting support board (2).
(3) is fixed with the air bubble (32) on top, and the fixed column (1)
1) and the two sets of pillars (15) are located at positions where the center of the support panel (2) for measuring instrument mounting forms a triangle with the center of gravity as the center of gravity, and the respective spherical support parts (10) are at the lower ends. The lower end of the fixed shaft column (11) and the two sets of columns (15) are supported by an upright central cylindrical body (18) whose upper end faces below the hollow attachment (17). On the plate (19), fix the sphere support portion (10) in a state of protruding downward, and connect the protruded sphere support portion (10) to the hole (1a) for vertical point irradiation at the center for connecting the lower stand. The attachment (20) is attached to the base (1) attached without protruding to the bottom surface by means that allows only swinging, and the biaxial direction is determined by the position of the air bubble (32) in the horizontality sensor (3). The drive of each of the motors (M) is controlled so that the change in impedance between the electrodes is directly converted into an electric signal and the analog signal becomes zero, The automatic level table device being characterized in that the transmission and retractable system <br/> Gosuru way the direct drive shaft (14) of the set column is converted into a linear motion (15). 2. The two-axis horizontal sensor (S3) is characterized in that the liquid chamber of the electrode holder (30) made of an insulating material having a bottom surface (41) as a horizontal surface and a liquid chamber recess (42) formed at the center of the plane. At the center of the inner bottom of the recess (42), the common electrode (36) is penetrated in a liquid-tight manner and vertically penetrated, and has a predetermined radius centered on the center of the inner bottom of the recess (42) for the liquid chamber. A horizontal orthogonal biaxial line (X) passing through the circle and the center,
Peripheral electrode with uniform surface area at the intersection with (Y) (37)
Projecting higher than the common electrode (36) and penetrating vertically in a liquid-tight state, respectively, and opening the upper opening of the electrode holder (30) at the center or the entire surface thereof with a spherical recess having a high surface roughness ( 33) A window plate (41) made of an insulating material such as glass formed in
(41) is closed inside in a liquid-tight state with the spherical concave portion (33) of the inner surface being aligned with the center axis of the common electrode (36), and bubbles are trapped in the closed liquid chamber concave portion (42). The common electrode (36) is always immersed in the electrolyte (31) with the electrolyte (31) mixed at a ratio where the surface tension is small and the impedance between the electrodes is a predetermined value in a horizontal state. and without touching the bubble (32) and, also claim 1 which is configured sealed respectively untouched the surrounding electrode (37) is also a bubble (32) in the horizontal state
Automatic leveling device as described. 3. The uniaxial horizontal sensor (S4) generates an arc line (A) having a predetermined radius centered on a point (P) on a vertical line (V) and bisected by the vertical line (V). A rotating body shape obtained by rotating around a horizontal center line (C) orthogonal to a radius on a vertical line (V) of the arc line (A), wherein the horizontal center line (C)
(38) with a high three-dimensional surface roughness with a right-angle cross section of a circular shape and a sealing end plate that closes the openings at both ends
(39), an electrode disposition chamber for enclosing the electrolyte (31) and bubbles (32)
The electrode holder (30) made of an insulating material on which the (34) is formed, a common electrode (36) which penetrates and protrudes radially in the electrode disposition chamber (34) at a position coinciding with the vertical line (V). And the common electrode (36)
And a surrounding electrode (37) projecting radially higher in the electrode disposition chamber (34) than the common electrode (36) at a symmetrical position along the horizontal center line (C) around the center and having a uniform surface area. Each of the electrodes is provided in a liquid-tight state, and in the electrode disposition chamber (34), there is an electrolytic solution in which a bubble (32) and a low surface tension are mixed in such a ratio that the impedance between the electrodes becomes a predetermined value in a horizontal state. With the liquid (31), the common electrode (36) is always immersed in the electrolytic solution (31) and does not touch the bubbles (32), and the surrounding electrode (37) does not touch the bubbles (32) in a horizontal state. in automatic level table apparatus according to claim 1, wherein the <br/> configuration encapsulated respectively. 4. The common electrode (36) and the surrounding electrode (37)
4. The automatic leveling apparatus according to claim 1, wherein the surface of the metal material having a low ionization tendency such as K (Au) is polished to make the surface area uniform. 5. An electrolytic solution (31) comprising purified water as a solvent, magnesium sulfate as a solute, anhydrous methanol as a solution,
4. An automatic leveling apparatus according to claim 1 , wherein one of anhydrous ethanol is mixed at a ratio such that the impedance between the electrodes is about 40 to 50 K.OMEGA. To increase the boiling point and lower the freezing point. 6. The surface roughness of the inner peripheral wall surface of the spherical recess (33) or the enclosure (38), claim to not more than JIS Rmax0.2S 1,2 or
3. The automatic leveling device according to 3 .