Surface type detection device and method

Abstract

The invention provides a surface type detection device and method. The surface type detection device comprises a movement device (33) and a two-axis detection device (34), the two-axis detection device (34) is mounted on a main body rack (13) of the movement device (33), and the laser tracker target ball (26) is arranged at the end part of a rotating shaft (24) of the two-axis detection device (34) and is used for carrying out signal interaction with a laser tracker (1) placed in the large-diameter ring opening workpiece (3) so as to form spatial position information of the laser tracker target ball (26); and according to the spatial position information of the target ball (26) of the laser tracker, obtaining the surface type detection data of the end surface of the large-diameter ring-opening workpiece. The device depends on the laser tracker and is combined with the ring opening end face moving device, and finally light and high-precision detection of equipment is achieved. Compared with a traditional suspension wire electrical measurement method and other methods, the method is higher in precision and more convenient.

Description

Technical Field

[0001] This invention relates to the field of surface processing technology, and in particular to a surface inspection device and method. Background Technology

[0002] With the expansion of power generation capacity of domestic hydropower generating units, the design diameter of the seat ring has also increased. Before machining the seat ring flange face, the flatness error of the flange face must be checked. Due to the large size of the seat ring, the difficulty of the check also increases. In the actual testing process, the rotary testing equipment is also very large, complicated to install, and the debugging time is increased, resulting in extremely low work efficiency and seriously affecting the overall construction cycle.

[0003] The current method for machining turbine seat rings is the suspension wire electrical measurement method, which determines the machining allowance of the seat ring flange surface by measuring data at multiple points around the circumference. However, the measurement process relies on visual readings, which are prone to errors and have low accuracy. Furthermore, the amount of data and engineering work involved in multi-point circumferential measurements is substantial, and statistical calculations are susceptible to errors. Summary of the Invention

[0004] This invention provides a surface shape detection device and method, which can replace manual operation by moving the device, and the measurement method simplifies the detection method and improves work efficiency.

[0005] This invention proposes a surface shape detection device, which includes: a motion device and a two-axis detection device;

[0006] The motion device includes a horizontally arranged main frame and a vertically arranged anti-fall device. The main frame and the anti-fall device are perpendicularly connected to each other to form an L-shaped structure. A power device is arranged on the main frame to drive the motion device to move along the end face of a large-diameter annular workpiece. The anti-fall device contacts the side wall of the end face of the large-diameter annular workpiece to prevent the motion device from falling.

[0007] The two-axis detection device is mounted on the main frame of the motion device. The two-axis detection device includes a radial axis, a Z-axis, a rotary axis motor, a rotary axis, and a laser tracker target ball.

[0008] The radial axis is horizontally disposed at one end of the main frame and can move horizontally along the radial direction of the large-diameter annular workpiece. The Z-axis is disposed on the radial axis and can move vertically along the axial direction of the large-diameter annular workpiece. The rotating axis is disposed on the Z-axis and can move with the Z-axis. The rotating axis motor is used to drive the rotating axis to rotate. The laser tracker target ball is disposed at the end of the rotating axis and is used to interact with the laser tracker placed inside the large-diameter annular workpiece to form the spatial position information of the laser tracker target ball. Then, the surface shape detection data of the end face of the large-diameter annular workpiece is obtained based on the spatial position information of the laser tracker target ball.

[0009] The laser tracker target ball interacts with the laser tracker in the following manner: the laser tracker emits a laser beam that shines onto the laser tracker target ball, the target ball reflects the laser beam back to the laser tracker, and the laser tracker receives the reflected laser beam and calculates the spatial position information of the laser tracker target ball based on the reflected laser beam.

[0010] Furthermore, the two-axis detection device also includes a shock absorption device, which is disposed between the rotary axis motor and the laser tracker target ball.

[0011] Furthermore, the process of forming the spatial position information of the laser tracker target ball, and then obtaining the surface profile detection data of the large-diameter annular workpiece end face based on the spatial position information of the laser tracker target ball, specifically includes:

[0012] A spatial coordinate system is established with the laser tracker as the origin and the earth as the reference, and a horizontal reference surface is established as the reference surface. When the motion device moves circumferentially along the end face of the large-diameter ring-shaped workpiece, the two-axis detection device drives the laser tracker target ball to reciprocate radially along the end face of the large-diameter ring-shaped workpiece. The laser tracker target ball moves relative to the end face of the large-diameter ring-shaped workpiece, and point cloud data of the laser tracker target ball's motion trajectory is formed based on the spatial position information of the laser tracker target ball.

[0013] The motion trajectory point cloud data is fitted, and then the relative difference between the fitted data and the geodetic reference surface is compared and analyzed to obtain the surface shape detection data of the end face of the large-diameter ring-shaped workpiece.

[0014] Furthermore, the number of power devices is two, and the axial direction of the power devices is consistent with the radial direction of the end face of the large-diameter annular workpiece; the power devices include a high-precision servo motor and a wear-resistant drive wheel.

[0015] Furthermore, the number of the fall protection devices is two, and each fall protection device includes an inertial wheel. The axial direction of the inertial wheel is consistent with the axial direction of the end face of the large-diameter annular workpiece. During the movement of the motion device on the annular surface, the inertial wheel contacts the side wall of the end face of the large-diameter annular workpiece, providing an outward thrust along the radial direction of the end face of the large-diameter annular workpiece.

[0016] Furthermore, the shock absorption device is a shock absorption spring or a rubber block.

[0017] This invention also proposes a surface shape detection method, which includes: establishing a spatial coordinate system with the laser tracker as the origin and the earth as the reference, and simultaneously establishing a horizontal reference surface as a reference surface; when the motion device moves circumferentially along the end face of the large-diameter annular workpiece, the two-axis detection device drives the laser tracker target ball to reciprocate radially along the end face of the large-diameter annular workpiece; the laser tracker target ball contacts and moves with the end face of the large-diameter annular workpiece, and point cloud data of the laser tracker target ball's motion trajectory is formed based on the spatial position information of the laser tracker target ball;

[0018] By fitting the motion trajectory point cloud data, and then comparing the relative difference between the fitted data and the geodetic reference surface, a large-aperture image is obtained.

[0019] The advantages of this invention compared to existing technologies are as follows: This invention leverages the advanced capabilities of a laser tracker, combined with a ring-shaped end-face moving device, ultimately achieving lightweight and high-precision detection. It offers higher accuracy and greater convenience compared to traditional methods such as the suspension wire electrical measurement method. This invention eliminates the manpower and material resources required for setting up detection equipment, reduces the number of personnel needed, improves the efficiency and accuracy of large-diameter ring-shaped surface detection, and lowers costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the motion device of the present invention;

[0021] Figure 2 This is a schematic diagram of the two-axis detection device of the present invention;

[0022] Figure 3 This is a schematic diagram of the motion during detection using the detection device of the present invention.

[0023] 1. Laser tracker 2. Device for inspecting the end face shape of large-diameter annular workpieces 3. Large-diameter annular end face workpiece 11. Power unit 12. Fall protection device 13. Main frame 21. Radial axis 22. Z-axis 23. Rotary axis motor 24. Rotary axis 25. Vibration damping device 26. Laser tracker target ball Detailed Implementation

[0024] This invention provides an apparatus and method for surface shape detection, and the specific embodiments of this invention are described in detail below.

[0025] This invention relates to a device for inspecting the end face profile of large-diameter annular workpieces. Figure 1 As shown, it includes: a motion device 33 and a two-axis detection device 34.

[0026] The motion device 33 includes a horizontally arranged main frame 13 and a vertically arranged anti-fall device 12. The main frame 13 and the anti-fall device 12 are vertically connected to each other to form an L-shaped structure. A power device 11 is arranged on the main frame 13 to drive the motion device 33 to move along the end face of the large-diameter annular workpiece. The anti-fall device 12 contacts the side wall 32 of the end face of the large-diameter annular workpiece to prevent the motion device 33 from falling.

[0027] Figure 2 As shown, the two-axis detection device 34 is mounted on the main frame 13 of the motion device 33. The two-axis detection device 34 includes a radial axis 21, a Z-axis 22, a rotary axis motor 23, a rotary axis 24, a shock absorption device 25, and a laser tracker target ball 26.

[0028] A radial shaft 21 is horizontally positioned at one end of the main frame 13, and can move horizontally along the radial direction of a large-diameter annular workpiece. A Z-axis 22 is positioned on the radial shaft 21, and can move vertically along the axial direction of the large-diameter annular workpiece. A rotating shaft 24 is positioned on the Z-axis 22 and can move with the Z-axis 22. A rotating shaft motor 23 drives the rotating shaft 24 to rotate. A laser tracker target ball 26 is positioned at the end of the rotating shaft 24 and is used to receive target signals. A vibration damping device 25 can be positioned between the rotating shaft motor 23 and the laser tracker target ball 26. The vibration damping device is composed of spring damping, but is not limited to spring damping. Any device with vibration damping function is considered to be a similar device that can achieve the purpose of vibration damping, such as elastic components like rubber.

[0029] The power unit 11 is the driving part of the motion device 33, providing forward motion force for the toroidal motion. There can be multiple power units 11, preferably two. The axial direction of the power unit 11 is consistent with the radial direction of the end face of the large-diameter annular workpiece. The power unit 11 includes a high-precision servo motor and a wear-resistant drive wheel.

[0030] The number of anti-fall devices 12 is multiple, preferably two. Each anti-fall device 12 includes an inertial wheel. The axial direction of the inertial wheel is consistent with the axial direction of the end face of the large-diameter annular workpiece. During the movement of the motion device 33 on the annular surface, the inertial wheel contacts the side wall 32 of the end face of the large-diameter annular workpiece, providing an outward thrust along the radial direction of the end face of the large-diameter annular workpiece 3, thereby preventing the detection device from falling.

[0031] When the inspection device performs the test, Figure 3As shown, a tracker 1 is installed inside the large-diameter annular workpiece 3. The tracker 1 can be positioned at the center of the large-diameter annular workpiece 3 or at any position within it, with the laser tracker target ball 26 being able to receive the laser normally. The tracker 1 emits a target signal. The laser tracker target ball 26 interacts with the laser tracker 1 placed inside the large-diameter annular workpiece 3 to form the spatial position information of the laser tracker target ball 26. Then, the surface shape detection data of the end face of the large-diameter annular workpiece is obtained based on the spatial position information of the laser tracker target ball 26.

[0032] A spatial coordinate system is established with the tracker 1 as the origin and the earth as the reference, and a horizontal reference surface of the earth is established as the reference surface. When the motion device 33 moves circumferentially along the end face 3 of the large-diameter annular workpiece, the two-axis detection device 34 drives the laser tracker target ball 26 to reciprocate radially along the end face 3 of the large-diameter annular workpiece. The laser tracker target ball 26 receives the target signal to form the spatial position information of the laser tracker target ball 26, and then obtains the point cloud data of the motion trajectory of the laser tracker target ball 26 based on the spatial position information of the laser tracker target ball 26.

[0033] The motion trajectory point cloud data can be further fitted, and then the fitted data can be compared and analyzed with the geodetic reference surface to form the surface shape detection data of the end face of a large-diameter ring-shaped workpiece.

[0034] This invention relies on the advanced technology of laser trackers and combines them with a ring end face moving device to ultimately achieve lightweight and high-precision detection.

[0035] This invention also proposes a method for surface shape detection, comprising:

[0036] A tracker 1 is installed inside the large-diameter ring-shaped workpiece 3, and the tracker 1 emits a target signal.

[0037] A spatial coordinate system is established with the laser tracker 1 as the origin and the earth as the reference, and a horizontal reference surface of the earth is established as the reference surface. When the motion device 33 moves circumferentially along the end face 3 of the large-diameter annular workpiece, the two-axis detection device 34 drives the laser tracker target ball 26 to reciprocate radially along the end face 3 of the large-diameter annular workpiece. The laser tracker target ball 26 contacts and moves with the end face 3 of the large-diameter annular workpiece, and the laser tracker target ball 26 motion trajectory point cloud data is formed according to the spatial position information of the laser tracker target ball 26.

[0038] The motion trajectory point cloud data is fitted, and then the relative difference between the fitted data and the geodetic reference surface is compared and analyzed to obtain the surface shape detection data of the end face of the large-diameter ring-shaped workpiece.

[0039] The detection device and method of the present invention eliminate the manpower and material resources required for setting up detection equipment, reduce the number of staff required, improve the work efficiency and detection accuracy of large-diameter toroidal detection, and reduce costs.

Claims

1. A surface shape detection device, characterized in that, It includes: a motion device (33) and a two-axis detection device (34); The motion device (33) includes a horizontally arranged main frame (13) and a vertically arranged anti-fall device (12). The main frame (13) and the anti-fall device (12) are vertically connected to each other to form an L-shaped structure. A power device (11) is arranged on the main frame (13). The power device (11) is used to drive the motion device (33) to move along the end face of the large-diameter annular workpiece. The anti-fall device (12) contacts the side wall (32) of the end face of the large-diameter annular workpiece to prevent the motion device (33) from falling. The two-axis detection device (34) is installed on the main frame (13) of the motion device (33). The two-axis detection device (34) includes a radial axis (21), a Z-axis (22), a rotary axis motor (23), a rotary axis (24), and a laser tracker target ball (26). The radial axis (21) is horizontally disposed at one end of the main frame (13), and the radial axis (21) can move horizontally along the radial direction of the large-diameter annular workpiece; the Z-axis (22) is disposed on the radial axis (21), and the Z-axis (22) can move vertically along the axial direction of the large-diameter annular workpiece; the rotating axis (24) is disposed on the Z-axis (22), and can move with the Z-axis (22); the rotating axis motor (23) is used to drive the rotating axis (24) to rotate; the laser tracker target ball (26) is disposed at the end of the rotating axis (24), and is used to interact with the laser tracker (1) placed inside the large-diameter annular workpiece (3) to form the spatial position information of the laser tracker target ball (26), and then obtain the surface shape detection data of the end face of the large-diameter annular workpiece according to the spatial position information of the laser tracker target ball (26); The laser tracker target ball (26) and the laser tracker (1) interact with each other in the following way: The laser tracker (1) emits a laser beam that illuminates the laser tracker target ball (26). The target ball (26) reflects the laser beam back to the laser tracker (1). The laser tracker (1) receives the reflected laser beam and calculates the spatial position information of the laser tracker target ball (26) based on the reflected laser beam.

2. The apparatus according to claim 1, characterized in that, The two-axis detection device (34) also includes a shock absorption device (25), which is disposed between the rotary axis motor (23) and the laser tracker target ball (26).

3. The apparatus according to claim 2, characterized in that, The process of generating spatial position information for the laser tracker target ball (26) and then obtaining surface profile detection data for the end face of a large-diameter annular workpiece based on the spatial position information of the laser tracker target ball (26) specifically includes: A spatial coordinate system is established with the laser tracker (1) as the origin and the earth as the reference, and a horizontal reference surface of the earth is established as the reference reference surface. When the motion device (33) moves circumferentially along the end face (3) of the large-diameter ring workpiece, the two-axis detection device (34) drives the laser tracker target ball (26) to move radially back and forth along the end face (3) of the large-diameter ring workpiece. The laser tracker target ball (26) moves relative to the end face (3) of the large-diameter ring workpiece, and the laser tracker target ball (26) motion trajectory point cloud data is formed according to the spatial position information of the laser tracker target ball (26). The motion trajectory point cloud data is fitted, and then the relative difference between the fitted data and the geodetic reference surface is compared and analyzed to obtain the surface shape detection data of the end face of the large-diameter ring-shaped workpiece.

4. The apparatus according to claim 1, characterized in that, The number of power devices (11) is two, and the axial direction of the power device (11) is consistent with the radial direction of the end face of the large-diameter annular workpiece; the power device (11) includes a high-precision servo motor and a wear-resistant drive wheel.

5. The apparatus according to claim 1, characterized in that, The number of the fall protection device (12) is two. The fall protection device (12) includes an inertial wheel. The axial direction of the inertial wheel is consistent with the axial direction of the end face of the large-diameter ring workpiece. During the movement of the motion device (33) on the ring surface, the inertial wheel contacts the side wall (32) of the end face of the large-diameter ring, providing a thrust outward along the radial direction of the end face of the large-diameter ring workpiece (3).

6. The apparatus according to claim 2, characterized in that, The shock absorption device (25) is a shock absorption spring or a rubber block.

7. A method for surface shape detection based on the device of claim 1, characterized in that, include: With the laser tracker (1) as the origin, a spatial coordinate system is established with the earth as the reference, and a horizontal reference surface of the earth is established as a reference surface. When the motion device (33) moves circumferentially along the end face (3) of the large-diameter annular workpiece, the two-axis detection device (34) drives the laser tracker target ball (26) to reciprocate radially along the end face (3) of the large-diameter annular workpiece; the laser tracker target ball (26) contacts and moves with the end face (3) of the large-diameter annular workpiece, and forms the laser tracker target ball (26) motion trajectory point cloud data according to the spatial position information of the laser tracker target ball (26); The motion trajectory point cloud data is fitted, and then the relative difference between the fitted data and the geodetic reference surface is compared and analyzed to obtain the surface shape detection data of the end face of the large-diameter ring-shaped workpiece.

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