Automatic leveling and positioning device and positioning method for displacement meter

Abstract

The invention discloses an automatic leveling and positioning device and method for a displacement meter, and belongs to the technical field of displacement sensors, the device comprises a support, a working rod, a first execution motor, a bogie, a second execution motor and a laser displacement sensor, and the laser displacement sensor is electrically connected with the first execution motor and the second execution motor. An output shaft of the first execution motor rotates around the X axis, and an output shaft of the second execution motor rotates around the Y axis. Through automatic installation, after the whole device is placed nearby, the device automatically completes searching of attitude angles and accurate vertical positioning, so that the laser displacement sensor is automatically fixed at the optimal measurement position; the precision is high, and by means of high-precision scanning measurement of the laser displacement meter and high-precision driving of the execution motor, the test stability and precision can be guaranteed to the maximum extent; and compared with manual self-adjustment, the execution motor and the laser displacement sensor are high in working efficiency, and the positioning speed is high.

Description

Technical Field

[0001] The invention belongs to the technical field of positioning devices, and particularly relates to a displacement gauge automatic level positioning device and a displacement method. Background Art

[0002] Laser displacement gauges have the advantages of high test accuracy, fast frequency response, no pressure on the test surface, and non-contact measurement. However, similar to other displacement gauges, laser displacement gauges also have the problems of complex calibration of the fixed table base and difficult installation operation. This is mainly because the support of the displacement gauge is fixed rather rigidly, and the angle adjustment of the displacement gauge is very test the patience of the operator. Generally speaking, the installation of the displacement gauge is divided into three steps: the first step is to set up an iron stable support close to the surface of the test piece; the second step is to fix the magnetic base and adsorb its base on the iron stable support; the third step is to carefully adjust the multi-link joints on the magnetic base so that the telescopic rod of the ordinary displacement gauge or the laser beam of the laser displacement gauge clamped on the magnetic base "vertically" touches the test surface, and the measured distance falls within the range. The first two steps are relatively easy and can be completed by simple operation using the principle of proximity. The third step requires the tester to flexibly adjust multiple joints to ensure that the telescopic rod or the beam of the laser displacement gauge points correctly to the test surface, and the displacement change trend of the test surface can completely fall within the test range of the displacement gauge. This may require stretching the length of the connecting rod and fine-tuning the joint angle. After ensuring that the postures of all components are appropriate, quickly tighten the joint knobs and lock all components. At the moment of tightening forcefully, the posture may change slightly again. At this time, loosen the joint, adjust the components, and lock again. Repeat this process. Since the displacement gauge may test different surfaces of the test piece and thus present different attitude angles, the tester has to operate the joint knobs in a very awkward way during installation, which is very uncomfortable and further increases the installation difficulty. In addition, in order to ensure the stability of the test, generally the magnetic base is relatively heavy, the magnetic attraction is relatively large, and the connecting rod is also a solid metal rod to ensure high stiffness and not easy to deform. Therefore, the installation and test personnel need to be careful, patient, strong and other qualities to do a good job in the test installation link. Summary of the Invention

[0003] Aiming at the above problems existing in the prior art, the technical problem to be solved by the present invention is to provide a displacement gauge automatic level positioning device and a positioning method that can quickly position the displacement gauge to the best measurement position before displacement measurement.

[0004] Technical Solution: To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0005] A displacement meter automatic leveling and positioning device, comprising a bracket, a working rod connected to the bracket, a first actuator motor connected to the working rod, a bogie connected to the first actuator motor, a second actuator motor connected to the bogie, and a laser displacement sensor connected to the second actuator motor. The laser displacement sensor is electrically connected to both the first actuator motor and the second actuator motor. The output shaft of the first actuator motor rotates around the X-axis, and the output shaft of the second actuator motor rotates around the Y-axis.

[0006] Preferably, it further comprises a control driver electrically connected to the laser displacement sensor, and the control driver is electrically connected to the first actuator motor and the second actuator motor.

[0007] Preferably, the bracket comprises a base and a column connected to the base. The working rod is rotatably connected to the column, and a locking assembly is provided at the rotation connection position.

[0008] Preferably, the locking assembly comprises a rotating shaft and a wing nut connected to the rotating shaft.

[0009] Preferably, the base comprises a magnetic base.

[0010] Preferably, the column comprises a plurality of telescopic joints.

[0011] The present invention also provides a displacement meter automatic leveling and positioning method, using the above displacement meter automatic leveling and positioning device, comprising the following steps:

[0012] Step 1: Fix the device at the corresponding position of the object to be measured through the bracket, and direct the laser emitting surface of the laser displacement sensor towards the plane to be measured of the object to be measured. The distance between the plane to be measured and the laser displacement sensor is within the effective range of the laser displacement sensor.

[0013] Step 2: The laser displacement sensor is in the initial position.

[0014] Step 3: The first actuator motor works to drive the bogie, the second actuator motor and the laser displacement sensor to rotate around the X-axis by an angle of α, where α ≤ 360°. The laser beam of the laser displacement sensor sweeps across the plane to be measured, generating a plurality of first distance measurement values. Record the plurality of first distance measurement values and their corresponding first actuator motor output shaft rotation positions.

[0015] Step 4: After the rotation in Step 3 ends, find the minimum value among the plurality of first distance measurement values and its corresponding first actuator motor output shaft rotation position, and rotate the first actuator motor output shaft to this position and lock it.

[0016] Step 5: The second execution motor operates to drive the laser displacement sensor to rotate around the Y-axis. As the laser displacement sensor rotates around the Y-axis by an angle β where β ≤ 360°, the laser beam of the laser displacement sensor sweeps across the plane to be measured, generating multiple second distance measurement values. Record the multiple second distance measurement values and the corresponding rotational positions of the output shaft of the second execution motor.

[0017] Step 6: After the rotation in Step 5 ends, find the minimum value among the multiple second distance measurement values and the corresponding rotational position of the output shaft of the second execution motor. Rotate the output shaft of the second execution motor to this position and lock it.

[0018] Step 7: At this time, the laser displacement sensor is in a posture perpendicular to the plane to be measured.

[0019] Preferably, in Step 3, when the first execution motor operates to drive the bogie, the second execution motor, and the laser displacement sensor to rotate around the X-axis, it first rotates to one side by an angle α1, and after returning to the position before rotation, it then rotates to the other side by an angle α2, where α1 + α2 = α.

[0020] Preferably, in Step 5, when the second execution motor operates to drive the laser displacement sensor to rotate around the Y-axis, it first rotates to one side by an angle β1, and after returning to the position before rotation, it then rotates to the other side by an angle β2, where β1 + β2 = β.

[0021] Preferably, after Step 2, Steps 5 and 6 are executed first. After fixing the position of the output shaft of the second execution motor, Steps 3 and 4 are then executed to fix the position of the output shaft of the first execution motor.

[0022] Preferably, in Step 1, the device is magnetically adsorbed on the object to be measured through the bracket.

[0023] Advantageous Effects: Compared with the prior art, the present invention has the following advantages:

[0024] 1. Automated installation. After the entire device is placed nearby and the device is started, the device automatically completes the search for the attitude angle and precise vertical positioning, enabling the laser displacement sensor to be automatically fixed at the optimal measurement position.

[0025] 2. High precision. In the traditional manual judgment of the attitude angle, the human eye's subjective feeling is used to estimate whether the test direction of the displacement gauge is perpendicular to the measured surface, which will obviously have a large error and is not conducive to achieving high-precision measurement. In the present invention, with the help of the high-precision scanning measurement of the laser displacement sensor and the high-precision drive of the execution motor, the stability and precision of the test can be maximally ensured.

[0026] 3. Faster installation speed. Compared with manual self-adjustment, the execution motor and the laser displacement sensor in this application have high working efficiency and fast positioning speed. Brief Description of the Drawings

[0027] Figure 1 is a schematic structural diagram of the device according to Embodiment 1 of the present invention;

[0028] Figure 2 is a schematic structural diagram at the laser displacement sensor in Embodiment 1;

[0029] Figure 3 is a schematic structural diagram of the usage state in Embodiment 1 of the present invention;

[0030] Figure 4 is a schematic diagram of the state process in Step 3 of Embodiment 1;

[0031] Figure 5 is a schematic diagram of the state process in Step 5 of Embodiment 1;

[0032] Figure 6 is a schematic structural diagram of the device bracket in Embodiment 2 of the present invention. Detailed Description of the Invention

[0033] The present invention will be further illustrated below in conjunction with specific embodiments. The embodiments are implemented on the premise of the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention.

[0034] Embodiment 1

[0035] As shown in Figure 1 and Figure 2 , a displacement gauge automatic leveling and positioning device includes a bracket 1, a working rod 2, a first actuator motor 3, a bogie 4, a second actuator motor 5, a laser displacement sensor 6, and a control driver 7. The bracket 1 includes a base 11 and a column 12. The base 11 is a rectangular plate, and the column 12 is connected to the center position of the upper end surface of the base 11, and the column 12 is perpendicular to the base 11. One end of the working rod 2 is rotatably connected to the upper end of the column 12, and a locking assembly is provided at the rotation connection position. The locking assembly includes a rotating shaft 81 and a wing nut 82. One end of the rotating shaft 81 is fixedly connected to one end of the working rod 2, the other end of the rotating shaft 81 penetrates through the column 12, the rotating shaft 81 is perpendicular to the column 12, an external thread is provided on the rotating shaft 81, and an internal thread corresponding to the external thread of the rotating shaft 81 is provided on the wing nut 82. The working rod 2 is rotatably connected to the column 12 through the rotating shaft 81. When the wing nut 82 is tightened after rotating to a predetermined position, the working rod 2 can be fixed at the predetermined position. When the working rod 2 needs to be adjusted, the wing nut 82 is loosened, so that the position of the working rod 2 can be adjusted.

[0036] As shown in Figure 1 and Figure 2As shown in the figure, the first actuating motor 3 is connected to the outermost end of the working rod 2. The first actuating motor 3 uses an existing servo motor or stepper motor, so that the output shaft of the first actuating motor 3 can rotate by a specified angle or reach a specified position. The central axis of the output shaft of the first actuating motor 3 is on the same straight line as the central axis of the working rod 2. The output shaft of the first actuating motor 3 rotates around the X-axis. The bogie 4 is connected to the output shaft of the first actuating motor 3. The bogie 4 is L-shaped. One end of the L-shaped bogie 4 is connected to the output shaft of the first actuating motor 3, and the other end of the L-shaped bogie 4 is fixedly connected to the bottom of the second actuating motor 5. The second actuating motor 5 also uses an existing servo motor or stepper motor. The output shaft of the second actuating motor 5 rotates around the Y-axis. The side of the laser displacement sensor 6 is connected to the output shaft of the second actuating motor 5. The laser displacement sensor 6 uses an existing laser displacement meter. A laser beam is generated inside the laser displacement meter. After passing through the emission lens, the laser hits the component to be measured. Then, the measured point reflects the light. After the reflected light passes through the receiving lens, it hits the detection element inside the sensor. The distance of the measured point can be calculated based on the different light-sensitive positions on the detection element. When the output shaft of the first actuating motor 3 rotates, it drives the bogie 4, the second actuating motor 5, and the laser displacement sensor 6 to rotate around the X-axis as a whole. When the output shaft of the second actuating motor 5 rotates, it drives the laser displacement sensor 6 to rotate around the Y-axis. When the second actuating motor 5 is driven to rotate around the X-axis, the straight line where the Y-axis is located rotates to form a plane, and the X-axis is perpendicular to this plane. The straight lines where the X-axis and the Y-axis are located respectively pass through the center of the laser beam emission source of the laser displacement sensor 6. Therefore, when the laser displacement sensor 6 rotates around the X-axis or around the Y-axis, the position of its laser beam emission source center remains unchanged. The control driver 7 uses an existing Arduino board. The Arduino board is the core component of an electronic development platform based on open-source hardware and software, mainly used for quickly realizing the prototype development of projects such as the Internet of Things and automation control. Core components: The main control chip is usually a microcontroller (such as ATmega328P), which is responsible for executing program instructions. Interface configuration: It includes digital I / O, analog input, power interfaces, and communication modules such as SPI, I2C, and UART, which are convenient for connecting sensors, actuating motors, or other peripherals. The control driver 7 can also use other existing boards with microprocessors. The control driver 7 is set on the base 11 or the column 12 or around the base 11. The control driver 7 is electrically connected to the laser displacement sensor 6, the first actuating motor 3, and the second actuating motor 5. The distance data measured by the laser displacement sensor 6 is sent to the control driver 7, and the control driver 7 controls the operation of the first actuating motor 3 and the second actuating motor 5.

[0037] As Figure 2 , Figure 3 , Figure 4 and Figure 5As shown in the figure, this embodiment also provides a method for automatically leveling and positioning a displacement gauge, which is used to fix a displacement gauge (laser displacement sensor 6) before measuring the mid-span deformation in a simple-supported beam bending test. The simple-supported beam includes a support 92 and a beam specimen 91 under bending. This method uses the above-mentioned displacement gauge automatic leveling and positioning device, and includes the following steps:

[0038] Step 1: Place the whole device on the side of the beam specimen 91 through the support 1. Move the laser displacement sensor 6 to the lower part of the beam specimen 91 by adjusting the position of the working rod 2, and the laser emitting surface of the laser displacement sensor 6 faces the lower end surface of the beam specimen 91. The distance between the lower end surface of the beam specimen 91 and the laser displacement sensor 6 is within the effective range of the laser displacement sensor 6. In this embodiment, the effective range of the laser displacement sensor 6 is 25 mm - 300 mm.

[0039] Step 2: The laser displacement sensor 6 is in the initial position.

[0040] Step 3: Control the driver 7 to control the first execution motor 3 to work according to the preset program. The first execution motor 3 drives the bogie 4, the second execution motor 5, and the laser displacement sensor 6 to rotate around the X-axis. At this time, the second execution motor 5 does not work, and the laser displacement sensor 6 rotates around the X-axis. The rotation angle is α. In this embodiment, α = 180°. When the laser displacement sensor 6 rotates around the X-axis, a laser beam is generated, and the laser beam sweeps across the lower end surface of the beam specimen 91 (as Figure 4 shown, the thick black line in the figure is the schematic diagram of the laser emission and reflection route), generating multiple first distance measurement values. The driver 7 records multiple first distance measurement values and multiple first execution motor 3 output shaft rotation positions corresponding to these first distance measurement values one by one.

[0041] Step 4: After the rotation around the X-axis is completed, the driver 7 compares the magnitudes of multiple first distance measurement values, finds the minimum value among multiple first distance measurement values and the corresponding first execution motor 3 output shaft rotation position, and the driver 7 controls the first execution motor 3 output shaft to rotate to this position and lock it.

[0042] Step 5: Control the driver 7 to control the second execution motor 5 to work according to the preset program. The second execution motor 5 drives the laser displacement sensor 6 to rotate around the Y-axis. The rotation angle is β. In this embodiment, β = 180°. When the laser displacement sensor 6 rotates around the Y-axis, a laser beam is generated, and the laser beam sweeps across the lower end surface of the beam specimen 91, generating multiple second distance measurement values. The driver 7 records multiple second distance measurement values and multiple second execution motor 5 output shaft rotation positions corresponding to these second distance measurement values one by one.

[0043] Step 6: After the rotation around the Y-axis ends, control the driver 7 to compare the magnitudes of multiple second distance measurement values, find the minimum value among the multiple second distance measurement values and the corresponding rotational position of the output shaft of the second actuator motor 5, and control the driver 7 to control the output shaft of the second actuator motor 5 to rotate to this position and lock it.

[0044] Step 7: At this time, the laser displacement sensor 6 is in a posture perpendicular to the lower end face of the beam specimen 91.

[0045] After the above steps, the position where the laser displacement sensor 6 is located is the optimal measurement position perpendicular to the lower end face of the beam specimen 91. Principle: In a space, the shortest distance from a plane to a point outside the plane is the perpendicular line segment. That is to say, assuming that countless line segments are projected from this point to this plane, by comparing the lengths of these line segments and taking the shortest line segment, the perpendicular line between the point and the plane can be determined. The center of the wire harness emission source of the laser displacement sensor 6 is this point. Making the direction of its laser beam consistent with the direction of the shortest line segment can complete the perpendicular fixation. The laser displacement sensor 6 completes rapid positioning, which is convenient for measuring the deformed beam of the beam specimen 91 in the subsequent bending test.

[0046] Embodiment 2

[0047] As Figure 6 shown, the difference from Embodiment 1 is that the base 11 includes a magnetic base 111. Four magnetic bases 111 are provided at the four corners of the base 11. The working surface of the magnetic base 111 faces downward. By rotating the handle, it is possible to select whether the working surface of the magnetic base 111 generates magnetic force. When the working surface of the magnetic base 111 has magnetic force, the entire device can be adsorbed in a suitable position through the magnetic base 111, which is convenient for fixing the entire device and adapting to different usage scenarios. Another difference from Embodiment 1 is that the column 12 includes multiple telescopic joints 121. The length of the column 12 can be adjusted through the multiple telescopic joints 121, which is convenient for pulling the column 12 to a suitable length according to the usage requirements and adapting to different usage scenarios.

[0048] This embodiment also provides a method for automatically leveling and positioning a displacement gauge, which is used to fix the displacement gauge before measuring the mid-span deformation in a simply supported beam bending test. The simply supported beam includes a support 92 and a beam specimen 91 under bending. This method uses the above-mentioned displacement gauge automatic leveling and positioning device, and includes the following steps:

[0049] Step S1: Place the entire device beside the beam specimen 91 through the support 1. Move the laser displacement sensor 6 below the beam specimen 91 by adjusting the position of the working rod 2, and the laser emitting surface of the laser displacement sensor 6 faces the lower end surface of the beam specimen 91. The distance between the lower end surface of the beam specimen 91 and the laser displacement sensor 6 is within the effective range of the laser displacement sensor 6. In this embodiment, the effective range of the laser displacement sensor 6 is 25 mm - 300 mm.

[0050] Step S2: The laser displacement sensor 6 is at the initial position.

[0051] Step S3: Control the driver 7 to control the second execution motor 5 to work according to the preset program. When the second execution motor 5 works, it drives the laser displacement sensor 6 to rotate around the Y-axis, and the rotation angle is β. When the second execution motor 5 drives the laser displacement sensor 6 to rotate around the Y-axis, it first rotates to one side with a rotation angle of β1. In this embodiment, β1 = 60°. After returning to the position before rotation, it then rotates to the other side with a rotation angle of β2. In this embodiment, β2 = 60°. β1 + β2 = β, and β = 120°. When the laser displacement sensor 6 rotates around the Y-axis, a laser beam is generated, and the laser beam sweeps across the lower end surface of the beam specimen 91, generating multiple second distance measurement values. The driver 7 records multiple second distance measurement values and the rotational positions of the output shafts of the multiple second execution motors 5 corresponding to these second distance measurement values one by one;

[0052] Step S4: After the rotation around the Y-axis is completed, the driver 7 compares the magnitudes of the multiple second distance measurement values, finds the minimum value among the multiple second distance measurement values and the corresponding rotational position of the output shaft of the second execution motor 5. The driver 7 controls the output shaft of the second execution motor 5 to rotate to this position and locks it;

[0053] Step S5: Control the driver 7 to control the first execution motor 3 to work according to the preset program. When the first execution motor 3 works, it drives the bogie 4, the second execution motor 5, and the laser displacement sensor 6 to rotate around the X-axis. At this time, the second execution motor 5 does not work, and the laser displacement sensor 6 rotates around the X-axis with a rotation angle of α. When the laser displacement sensor 6 rotates around the X-axis, it first rotates to one side with a rotation angle of α1. In this embodiment, α1 = 60°. After returning to the position before rotation, it then rotates to the other side with a rotation angle of α2. In this embodiment, α2 = 60°. α1 + α2 = α, and α = 120°. When the laser displacement sensor 6 rotates around the X-axis, a laser beam is generated, and the laser beam sweeps across the lower end surface of the beam specimen 91, generating multiple first distance measurement values. The driver 7 records multiple first distance measurement values and the rotational positions of the output shafts of the multiple first execution motors 3 corresponding to these first distance measurement values one by one;

[0054] Step S6: After the rotation around the X-axis ends, control the driver 7 to compare the magnitudes of multiple first distance measurement values, find the minimum value among the multiple first distance measurement values and the rotational position of the output shaft of the first actuator motor 3 corresponding thereto, and control the driver 7 to control the output shaft of the first actuator motor 3 to rotate to this position and lock it;

[0055] Step 7: At this time, the laser displacement sensor 6 is in a posture perpendicular to the lower end surface of the beam specimen 91.

[0056] After the above steps, the position where the laser displacement sensor 6 is located is the optimal measurement position perpendicular to the lower end surface of the beam specimen 91. In this embodiment, when the laser displacement sensor 6 rotates around the Y-axis and the X-axis, it rotates to both sides, reducing the rotation range on one side, and facilitating the rapid finding of the optimal measurement position of the laser displacement sensor 6.

[0057] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An automatic level positioning device for a displacement gauge, characterized in that It includes a bracket (1), a working rod (2) connected to the bracket (1), a first execution motor (3) connected to the working rod (2), a bogie (4) connected to the first execution motor (3), a second execution motor (5) connected to the bogie (4), and a laser displacement sensor (6) connected to the second execution motor (5). The laser displacement sensor (6) is electrically connected to both the first execution motor (3) and the second execution motor (5). The output shaft of the first execution motor (3) rotates around the X-axis, and the output shaft of the second execution motor (5) rotates around the Y-axis.

2. The automatic level positioning device for displacement meters according to claim 1, wherein It further includes a control driver (7) electrically connected to the laser displacement sensor (6), and the control driver (7) is electrically connected to the first execution motor (3) and the second execution motor (5).

3. The automatic level positioning device for a displacement meter according to claim 1, characterized in that, The bracket (1) includes a base (11) and a column (12) connected to the base (11). The working rod (2) is rotatably connected to the column (12), and a locking assembly is provided at the rotation connection position.

4. The automatic leveling and positioning device for a displacement meter according to claim 3, characterized in that The locking assembly includes a rotating shaft (81) and a wing nut (82) connected to the rotating shaft.

5. The automatic leveling and positioning device for a displacement meter according to claim 3, characterized in that, The base (11) includes a magnetic base (111).

6. The automatic leveling and positioning device for a displacement meter according to claim 3, characterized in that The column (12) includes a plurality of telescopic joints (121).

7. A method for automatically leveling and positioning a displacement gauge, using the displacement gauge automatic leveling and positioning device according to any one of claims 1-6, characterized in that, It includes the following steps: Step 1: Fix the device at the corresponding position of the object to be measured through the bracket (1), and orient the laser emission surface of the laser displacement sensor (6) towards the plane to be measured of the object to be measured. The distance between the plane to be measured and the laser displacement sensor (6) is within the effective range of the laser displacement sensor (6). Step 2: The laser displacement sensor (6) is in the initial position. Step 3: The first execution motor (3) works to drive the bogie (4), the second execution motor (5), and the laser displacement sensor (6) to rotate around the X-axis by an angle of α, where α ≤ 360°. The laser beam of the laser displacement sensor (6) sweeps across the plane to be measured, generating a plurality of first distance measurement values. Record the plurality of first distance measurement values and the rotation positions of the output shaft of the first execution motor (3) corresponding to them. Step 4: After the rotation in Step 3 ends, find the minimum value among the plurality of first distance measurement values and the rotation position of the output shaft of the first execution motor (3) corresponding to it. Rotate the output shaft of the first execution motor (3) to this position and lock it. Step 5: The second execution motor (5) works to drive the laser displacement sensor (6) to rotate around the Y-axis. The laser displacement sensor (6) rotates around the Y-axis by an angle of β, where β ≤ 360°. The laser beam of the laser displacement sensor (6) sweeps across the plane to be measured, generating a plurality of second distance measurement values. Record the plurality of second distance measurement values and the rotation positions of the output shaft of the second execution motor (5) corresponding to them. Step 6: After the rotation in Step 5 ends, find the minimum value among the plurality of second distance measurement values and the rotation position of the output shaft of the second execution motor (5) corresponding to it. Rotate the output shaft of the second execution motor (5) to this position and lock it. Step 7: At this time, the laser displacement sensor (6) is in a posture perpendicular to the plane to be measured.

8. The automatic leveling and positioning method of the displacement gauge according to claim 7, characterized in that, In the said step 3, when the first actuating motor (3) operates to drive the bogie (4), the second actuating motor (5) and the laser displacement sensor (6) to rotate about the X-axis, it first rotates to one side by an angle of α1, and then rotates to the other side by an angle of α2 after returning to the position before rotation, where α1 + α2 = α.

9. The automatic leveling and positioning method of a displacement gauge according to claim 7, characterized in that In the said step 5, when the second actuating motor (5) operates to drive the laser displacement sensor (6) to rotate about the Y-axis, it first rotates to one side by an angle of β1, and then rotates to the other side by an angle of β2 after returning to the position before rotation, where β1 + β2 = β.

10. The automatic leveling and positioning method of the displacement gauge according to claim 7, characterized in that, After the said step 2, steps 5 and 6 are first executed, and after fixing the position of the output shaft of the second actuating motor (5), steps 3 and 4 are then executed to fix the position of the output shaft of the first actuating motor (3).

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