JPH02173515A - Automatic leveling device for a pedestal part of surveying instrument - Google Patents

Abstract

PURPOSE:To automatically execute leveling in a short time by providing a light emitting means formed in a pendulum and a sensing device provided with a horizontal coordinate provided with a light receiving means on every block on a pedestal part side. CONSTITUTION:In a pedestal part 5 of a survey instrument supported through three pieces of height adjusting screws 3a - 3c on a supporting board 1 of the upper end of a tripod, a light emitting means formed in a pendulum 16 and a sensing device 11 in which a horizontal coordinate 17 provided with a light receiving means on every block is provided right under the light emitting means are provided on the pedestal part side, at least two pieces among three pieces height adjusting screws 3a - 3c can be turned by a motor, and driving of the motor is controlled by an output of the sensing device 11. At the time of using by extending the tripod and adjusting the length of the tripod, the supporting board 1 is set to desired height. In the sensing device 11, a laser light emitted from a semiconductor 18 is condensed by a collimating lens 19 and reaches the horizontal coordinate 17, and detected by a photodiode 22. In such a way, leveling can be executed automatically in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic leveling device for the pedestal of a surveying instrument used for marking out transits or levels in construction work or the like.

(Prior art) Such a surveying instrument is supported by a tripod, and a support plate is provided at the upper end of the tripod, and the pedestal on the surveying instrument side is mounted on this support plate with a height j [node screws]. It is supported at three points through the

In order to check the levelness of the pedestal, in the case of a level meter, the height adjustment screws are used to adjust the support heights at the three points to first obtain a rough horizontal level, and then when this level falls within a certain range, the pedestal is placed on the swing. The optical axis of the optical system is corrected by the mirror.

On the other hand, in transit vehicles, etc., the horizontal level of the pedestal is adjusted using the three-point support of the height adjustment screws, and the height adjustment screws are operated while looking at a bubble level provided on the pedestal.

[Problem to be solved by the invention]

However, in any of the above cases, a great level of skill is required to achieve the same level in a short period of time. Further, the accuracy depends on the manufacturing precision of the bubbles in the spirit level, and if the surroundings are too bright or too dark and the working environment is poor, it will be difficult to use.

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic level setting device for a surveying instrument pedestal, which eliminates the disadvantages of the conventional example and can automatically set the level in a short time.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a pendulum-shaped light emitting means and a light receiving means for each section in the pedestal of a surveying instrument supported on a support plate at the upper end of a tripod via three height adjustment screws. A sensing device with horizontal coordinates arranged directly below the light emitting means is provided on the pedestal side, at least two of the three height adjustment screws are rotatable by motors, and The gist of this is to control the drive using the output of the sensing device.

[Effect]

According to the present invention, the light from the light emitting means enters the light receiving means, and the sensing device can detect the inclination of the pedestal depending on which section of the horizontal coordinate the light enters the light receiving means. and,
By appropriately driving the motor using the output of the sensing device, two of the three height adjustment screws that support at least three points are rotated, and the horizontal level can be automatically set.

〔Example〕

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

FIG. 1 is a longitudinal sectional side view of the main parts of a surveying instrument equipped with the automatic leveling device of the present invention, in which 1 is a tripod 2 as shown in FIG.
It is a support plate installed at the upper end of the .

As shown in FIG. 2, height adjustment screws 3a to 3c are arranged at equal intervals from the center of the support 11, and these screws 3a to 3
C supports the pedestal portion 5 of the surveying instrument 4.

6 in the figure is a manual rotation ring provided on the screws 33 to 3c,
In addition to this ring 6, a pulley 7 is attached to the screws 3a and 3b, and a motor 8a is attached to the support plate 1.

8b and a speed reducer 9 connected thereto were provided. The output shaft 9a of the reducer 9 and the pulley 7 are connected by a belt 10.

Note that the belt 10 can be replaced with a chain, and the boot IJ-7 can be replaced with a sprocket.

A sensing device 11 and its control section (including a power source) 12 were attached to the pedestal section 5.

FIG. 3 shows the details of this sensing device 11, in which a piano is connected to the ceiling of a cylindrical case 13, which is filled with an insulating material for buffering and over-vibration damping, and a liquid or gas 24 as a dew and antifreeze material. A pendulum 16 containing a built-in light emitting means is suspended via a hanging thread 15 made of wire or polymer fiber, and a horizontal coordinate 17 provided with a light receiving means is pasted on the bottom of the case 13, directly below the pendulum 16.

Among these, the light emitting means was a combination of a semiconductor laser 18 and a collimating lens 19, and the surrounding area was surrounded by a buffer cover 20. In the figure, reference numeral 21 denotes a heavy sealing material disposed inside the cover 20. As shown in FIG.

The light receiving means is based on a photodiode 22, and as shown in FIG. 5, the horizontal coordinate 17 is divided into four sections (1) to (4) along the XY axes from the center 0 point, and the photodiode 22 is arranged in each section. be done.

These four photodiodes 22 output through differential amplifiers 23a and 23b of the control section 12, and drive and control the motor 8.

The surveying instrument 4 on the pedestal 5 is not particularly limited, but a racer level meter is suitable as an example. A level 27 made of another bubble is also installed on the portion 5.

Next, the usage and operation will be explained.

In use, the tripod 2 is unfolded and the length of the tripod 2 is adjusted to set the support plate 1 at a desired height. Also, 3
Rough horizontal settings may be given to the pedestal portion 5 by turning the height adjustment screws 3a to 3c using the manual turning ring 6.

In the sensing device 11, the laser light emitted from the semiconductor laser 18 is focused by the collimating lens 19 and reaches the horizontal coordinate 17, and the photodiode 22 detects this.

Fig. 6 shows the situation. For example, if the laser beam is applied only to sections (1) and (2) and is off center, as shown in (a), the section (1) in Fig. 5 is deviated from the center. The photodiodes 22 of 1) and (2) output, the differential amplifier 23a outputs a positive output, and the differential amplifier 23b outputs a negative output.

The motors 8a, 8b are connected to these differential amplifiers 23a, 23b.
When the output of the differential amplifier 23a is positive, the motor 8a always lowers the screw 3a, and when the output is negative, the motor 8a lowers the screw 3a. When the output of the differential amplifier 23b is positive, the motor 8b always lowers the screw 3b, and when the output is negative, the motor 8b always lowers the screw 3b. The screw 3C is fixed. Furthermore, the speed of the motors 8a and 8b is assumed to change depending on the degree of positive and negative outputs of the differential amplifiers 23a and 23b, and when there is a difference in the outputs of the photodiodes 22, the speed is increased (and when there is no difference, the speed is decreased, so that the laser beam prevent overruns.

In the case shown in FIG. 6(a), the screw 3a is lowered and the screw 3b is lowered to a wide extent.

As shown in Figure (b), if the laser beam is concentrated in sections (1) and (4), and a little on sections (2) and (3), then The photodiode 22 also outputs, and the differential amplifier 23a outputs
'', the screw 3a stops, but the differential amplifier 23b continues to output a positive output, and the screw 3b slows down.

In this way, when the laser beam is completely centered as shown in FIG.
Both outputs of 3a and 23b are "0".

Then, both screws 3a and 3b are stopped and horizontal setting is performed.

The above description has been given as an example, but even if the laser beam extends over many other sections, the same operation will be performed to automatically adjust the laser beam to the center position.

The motor 26 also adjusts the surveying instrument 4 in the vertical direction.

〔Effect of the invention〕

As mentioned above, the automatic leveling device for the survey instrument pedestal is
The pedestal of the surveying instrument, which is supported via three height adjustment screws on the support plate at the top end of the tripod, can be automatically set horizontally in a short time. Since there are no errors caused by visual inspection by the operator, accuracy can be ensured.

Furthermore, since the setting is automatic based on electrical judgment, it can be used regardless of whether the work environment is dark or bright.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional side view of a surveying instrument pedestal equipped with an automatic level setting device of the present invention, Fig. 2 is a plan view of a support plate body of the present invention, and Fig. 3 is a 1st view of a sensing device of the present invention. FIG. 4 is a perspective view of the entire surveying instrument, FIG. 5 is a circuit diagram used in the present invention, and FIG. 6 is an explanatory diagram showing the state of the sensing device. 1... Support plate 2... Tripod 3a, 3b,
3cm・-Height adjustment screw 4...N meter 5...Pedestal part 6...Manual rotation ring 7...Pulleys 8a, 8b...Motor 9...Reducer 9a...・Output shaft 1
0... Belt 11... Sensing device 12...
・Control unit 13... Cylindrical case 14... Lid 1
5... Hanging string 16... Pendulum 17...
Horizontal coordinate 19...Collimating lens 21...Sealing material 23a, 23b...Differential amplifier 25...Support body 27...Level 18...Semiconductor laser 20...Buffer cover 22... ...Photodiode 24...Liquid or gas 2G...Motor

Claims (1)

[Claims] In the pedestal of the surveying instrument supported on the support plate at the upper end of the tripod via three height adjustment screws, the horizontal coordinates of the light emitting means formed in the form of a pendulum and the light receiving means arranged in each section are determined by the light emitting means. A sensing device provided directly under the above 3 is provided on the pedestal side.
An automatic leveling device for a surveying instrument pedestal, characterized in that at least two of the height adjustment screws are rotatable by a motor, and the drive of these motors is controlled by the output of a sensing device.