CN114964304A

CN114964304A - Building industry ground laser leveling instrument correcting mechanism

Info

Publication number: CN114964304A
Application number: CN202110215304.XA
Authority: CN
Inventors: 孙宗正
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-02-19
Filing date: 2021-02-19
Publication date: 2022-08-30

Abstract

The invention discloses a correcting mechanism of a laser leveling instrument for the ground of the building industry, and relates to the field of detection of the ground flatness and levelness of the building industry. The building industry ground laser leveling instrument correcting mechanism comprises an acceleration sensor, an inclination angle sensor and an automatic leveling mechanism. The acceleration sensor, the inclination angle sensor and the laser range finder are physically fixed and arranged on the pendulum type automatic leveling mechanism. The acceleration sensor is used for correcting the displacement of the laser planometer in the vertical direction; the inclination angle sensor is used for measuring and correcting the horizontal inclination angle of the laser beam emitted by the laser range finder and correcting the included angle between the acceleration sensor and the vertical line of the horizontal plane; the pendulum type automatic leveling mechanism is used for correcting errors caused by sensor drift of the tilt angle sensor.

Description

Building industry ground laser leveling instrument correcting mechanism

Technical Field

The invention relates to the field of detection of ground flatness and levelness in the building industry.

Background

In the building industry, the flatness and levelness of the original ground of a building must be evaluated when the building is decorated, and the flatness and levelness of the building can reach certain standards and be evaluated by professional means. The invention discloses a non-contact detector for detecting the flatness and levelness of the ground and the wall based on a laser ranging device. The non-contact detection of the flatness and the levelness of the plane to be detected can be completed at one fixed point. However, the laser planometer cannot move in the measuring process and the motor rotates to cause the vibration of the laser planometer body, so that the measuring error is caused. In addition, the accuracy of the mechanical transmission mechanism is not enough, so that the laser beam distributed by the laser beam distribution device can not reach the theoretically required accuracy of the inclination angle with the horizontal plane, and the detection accuracy is influenced.

Disclosure of Invention

In view of the above problems, the present invention provides a calibration mechanism for a laser leveling instrument, which can calibrate the error between the laser beam emitted from the laser ranging instrument and the horizontal plane inclination angle caused by the displacement and mechanical precision of the leveling instrument due to vibration and movement. The technical scheme of the invention is realized as follows: a correcting mechanism of a ground laser leveling instrument comprises an acceleration sensor, an inclination angle sensor and an automatic leveling mechanism. The laser distance measuring instruments of the acceleration sensor, the inclination angle sensor and the laser planometer are physically fixed with each other, and are hung on the rotating support which can freely swing left and right, front and back within a certain range without changing angles and positions.

The laser planometer correcting mechanism adopts an acceleration sensor to correct a measuring error caused by the vibration of a machine body generated by the movement process of the laser planometer or the rotation of a motor. An acceleration sensor is a sensor capable of measuring acceleration. The damper is generally composed of a mass block, a damper, an elastic element, a sensitive element, an adjusting circuit and the like. In the acceleration process of the sensor, the acceleration value is obtained by measuring the inertial force borne by the mass block and utilizing Newton's second law. Common acceleration sensors include capacitive, inductive, strain, piezoresistive, piezoelectric, etc. depending on the sensor sensing element. The automobile lens has been widely applied to the fields of active shock prevention, hand shake prevention, lens shake prevention and the like of automobiles at present. The acceleration sensor is a 3-axis acceleration sensor, and can measure acceleration values on X, Y, Z sensitive axes which are perpendicular to each other. The acceleration sensor measures the acceleration of the laser range finder in the vertical direction, and the vertical displacement of the laser range finder is obtained after 2 times of integration and is used for correcting the displacement of the planometer in the vertical direction. The correction process is as follows:

the method comprises the following steps: a plurality of acceleration sensors are arranged in the laser beam axial direction of the laser range finder, and one sensitive axis of each acceleration sensor is the same as the laser beam axial direction of the laser range finder. The sensitive axes of the plurality of acceleration sensors are parallel or vertical to each other.

Step two: the acceleration sensor sensitive axis can be deviated and deflected due to the movement or mechanical vibration of the planometer body in the running process of the laser planometer, the inclination angle sensor can monitor the inclination angle of the acceleration sensor sensitive axis relative to the vertical line of the horizontal plane in real time, the acceleration is a vector, the acceleration vector in the vertical direction can be calculated by utilizing a triangle rule, and the correction of the acceleration is realized.

Step three: performing twice integration on the acquired acceleration signal to obtain displacement information;

step four: and obtaining the displacement in the vertical direction of the laser range finder and the deflection angle of the laser beam according to the displacement information of each acceleration sensor.

The laser planometer correcting mechanism adopts the inclination angle sensor to measure the included angle between a laser beam emitted by the laser range finder and the horizontal plane and the included angle between the sensitive shaft of the acceleration sensor and the vertical line of the horizontal plane, and is used for correcting the error between the emergent laser beam of the laser range finder and the inclination angle of the horizontal plane caused by the machining precision and correcting the error caused by the offset of the sensitive shaft of the acceleration sensor. Tilt sensors, also known as inclinometers, gradiometers, inclinometers, are often used for horizontal angular change measurement of systems. As a detection tool, the device becomes an indispensable important measuring tool in the fields of bridge erection, railway laying, civil engineering, oil drilling, aviation and navigation, industrial automation, intelligent platforms, machining and the like. The inclination angle between the laser beam emitted by the laser range finder and the horizontal plane is difficult to reach the theoretically required precision due to the machining precision and the like, and the existing high-precision inclination angle sensor can basically reach the precision of 0.001 degrees, so that the correction of the inclination angle of the laser beam is realized. In the running process of the laser planometer, the sensitive axis of the acceleration sensor can deviate and deflect due to the movement of a planometer body or mechanical vibration, the inclinometer can monitor the inclination angle of the sensitive axis of the acceleration sensor relative to the vertical line of a horizontal plane in real time, and the acceleration is a vector, and can be calculated by utilizing a triangle rule to correct the acceleration.

The tilt sensor may also drift with time and temperature, so-called sensor drift, which may seriously affect the measurement result. The sensor drift is a phenomenon that the output quantity of the sensor changes with time under the condition that the input quantity is not changed. The cause of drift is two-fold: firstly, the self-structure parameters of the sensor; the second is the ambient environment (e.g., temperature, humidity, etc.). The most common drift is temperature drift, i.e. the ambient temperature changes and causes the output to change, and the temperature drift is mainly represented by temperature zero drift and temperature sensitivity drift. The laser planometer correcting mechanism adopts a pendulum body to automatically compensate errors generated by the drift of the sensor. The acceleration sensor, the inclination angle sensor and the laser range finder are physically fixed with each other, and a pendulum bob is formed without changing the angle and the distance. The pendulum bob is hung on a rotating mechanism which can freely swing left and right, front and back in a certain range, and under the action of the gravity of the earth, the hung pendulum bob is always vertical to the ground, namely, the included angles between three XYZ sensitive axes of an acceleration sensor and the horizontal plane, the included angles between an emergent laser beam of a laser range finder and the horizontal plane, and the included angles between an inclination angle sensor and the horizontal plane are not changed in a freely hanging state. The correction process is as follows:

the method comprises the following steps: measuring included angle delta between initial time tilt angle sensor and laser range finder emergent laser beam

Step two: measuring the inclination angle value gamma measured by the inclinometer when the pendulum bob consisting of the acceleration sensor, the inclination angle sensor and the laser range finder is freely suspended at the initial time

Step three: measuring the inclination value M measured by the inclinometer when the pendulum bob consisting of the acceleration sensor, the inclination sensor and the laser range finder is freely suspended after the sensor is drifted

Step four: and calculating to obtain the value of an included angle beta between the inclination angle sensor after the sensor is drifted and the emergent laser beam of the laser range finder by taking gamma and delta as constants. Beta-gamma + delta

Drawings

The drawings in the following description are only some embodiments of the invention, and other drawings can be derived by those skilled in the art without inventive exercise.

FIG. 1 is a block diagram of the structure of the ground laser leveling instrument correcting mechanism

The corresponding part names indicated by the numbers in the figures:

1-rotating the bracket; 2-laser range finder; 3-acceleration sensor a; 4-acceleration sensor B; 5-a tilt sensor; 6-Bluetooth module

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiment of the invention provides a correcting mechanism of a ground laser leveling instrument in the building industry.

The uppermost end of a correcting mechanism of the laser planometer is a rotary support 1 which can freely swing left and right, front and back in a certain range, a laser range finder 2 is suspended below the support, an acceleration sensor A and an acceleration sensor B are fixed below the laser range finder, and a sensitive shaft of the acceleration sensor A and the acceleration sensor B is the same as the laser beam axial direction of the range finder. The remaining 2 axes of the two acceleration sensors are parallel or perpendicular to each other. An inclination angle sensor 5 is fixed below the acceleration sensors a and B. A Bluetooth module 6 is fixed below the tilt sensor. Above-mentioned laser range finder, acceleration sensor, tilt sensor, bluetooth module all physical fixation each other, angle, position are unchangeable each other, form a pendulum and hang on runing rest.

The laser planometer correcting mechanism adopts an acceleration sensor to correct a measuring error caused by vibration of a machine body generated by movement of the laser planometer or rotation of a motor. The correction process is as follows:

the method comprises the following steps: a laser range finder laser beam axial direction is provided with an acceleration sensor A and an acceleration sensor B, and one sensitive axis of the acceleration sensor is the same as the laser beam axial direction of the range finder. The axial directions of the two acceleration sensors are parallel or vertical to each other.

Step two: in the running process of the laser planometer, the sensitive axis of the acceleration sensor can deviate and deflect due to the movement of a planometer body or mechanical vibration, the inclinometer can monitor the inclination angle of the sensitive axis of the acceleration sensor relative to the vertical line of a horizontal plane in real time, and the acceleration is a vector, and can be calculated by utilizing a triangle rule to correct the acceleration.

Step three: the collected acceleration signals are transmitted to upper computer software on the mobile phone by the Bluetooth module to be subjected to twice integration to obtain displacement information;

step four: and the upper computer software on the mobile phone obtains the displacement in the vertical direction of the laser range finder and the deflection angle of the laser beam according to the displacement information of each acceleration sensor. And compensates for the displacement and angular deflection as the data is processed to obtain the ground elevation difference.

The laser planometer correcting mechanism adopts an inclination angle sensor to measure an included angle between a laser beam emitted by the laser range finder and a horizontal plane, and an inclination angle value measured by the inclination angle sensor is transmitted to mobile phone end host computer software through a Bluetooth module and is used for correcting errors of an emergent laser beam of the laser range finder and a horizontal plane inclination angle caused by machining precision and correcting errors caused by the offset of a sensitive shaft of an acceleration sensor.

The tilt sensor may also drift with time and temperature, so-called sensor drift, which may seriously affect the measurement result. The laser planometer correcting mechanism adopts a pendulum body to automatically compensate errors generated by the drift of the sensor. The acceleration sensor, the inclination angle sensor and the laser range finder are physically fixed with each other, and a pendulum bob is formed without changing the angle and the distance. The pendulum bob is hung on a rotating mechanism which can freely swing left and right, front and back in a certain range, and under the action of the gravity of the earth, the hung pendulum bob is always vertical to the ground, namely, the included angle between the three XYZ sensitive axes of the acceleration sensor and the horizontal plane, the included angle between the emergent laser beam of the laser range finder and the horizontal plane, and the included angle between the tilt sensor and the horizontal plane are not changed in the freely-hung state. The correction process is as follows:

the pendulum bob is opened to swing freely in a certain range.

Step four: and calculating to obtain the value of an included angle beta between the inclination angle sensor after the sensor is shifted and the laser beam emitted by the laser range finder by taking gamma and delta as constants. beta-M-gamma + delta

Claims

1. A correcting mechanism of a ground laser leveling instrument is characterized by comprising an acceleration sensor, an inclination angle sensor and an automatic leveling mechanism.

2. The ground laser leveling instrument correcting mechanism according to claim 1, wherein the acceleration sensor is a 3-axis acceleration sensor physically fixed with the laser ranging instrument, the acceleration sensor measures acceleration of the laser ranging instrument in the vertical direction, and vertical displacement of the laser ranging instrument is obtained after 2 times of integration, and the acceleration sensor is used for correcting the displacement of the laser leveling instrument in the vertical direction.

3. The ground laser leveling instrument correcting mechanism according to claim 1, wherein the tilt sensor is physically fixed to the acceleration sensor and the laser distance measuring instrument, and is used for measuring and correcting the horizontal tilt angle of the laser beam emitted by the laser distance measuring instrument and the vertical line of the horizontal plane and the included angle between the sensitive axis of the acceleration sensor and the vertical line of the horizontal plane.

4. The ground laser leveling instrument correcting mechanism according to claim 1, wherein the automatic leveling mechanism is a pendulum type, and the acceleration sensor, the tilt sensor and the laser distance measuring instrument are physically fixed with each other to form a pendulum for correcting errors caused by sensor drift of the tilt sensor.