A device and method for detecting surface flatness of high-finish cold-drawn steel pipe

Abstract

The present invention relates to the field of surface measurement technology, specifically to a device and method for detecting the surface flatness of a high-finish cold-drawn steel pipe, comprising a workbench, a rotatable rotating plate is provided on the workbench, a movable detection mechanism is provided on the rotating plate, the detection mechanism comprises a first laser rangefinder and a second laser rangefinder movable relative to the rotating plate, the first laser rangefinder is arranged parallel to the axis of the rotating plate, the output end of the second laser rangefinder is arranged toward the axis of the rotating plate, the second laser rangefinder and the first laser rangefinder are located in the same plane, and the second laser rangefinder is perpendicular to the first laser rangefinder, a signal receiving plate on the workbench is fixedly provided on one side of the workbench away from the rotating plate, a clamping mechanism is also provided on the workbench, and the rotating plate is coaxial with the clamping mechanism. The coordinates of various locations on the surface of the steel pipe can be obtained, a three-dimensional model of the steel pipe can be obtained according to the coordinate data, and the locations where depressions or protrusions appear are marked and the unevenness of the locations can be obtained.

Description

Technical Field

[0001] The invention relates to the technical field of surface measurement, and in particular to a device and method for detecting the surface flatness of a high-finish cold-drawn steel pipe. Background Art

[0002] Cold drawn steel pipe is a kind of steel pipe. Different from hot rolled (expanded) pipe, it is made by multiple cold drawing processes during the process of expanding the diameter of rough pipe or raw material pipe. As an important metal material, cold drawn steel pipe is widely used in many fields such as construction, machinery, automobile, petrochemical industry, etc. With the advancement of science and technology and the changes in market demand, the production process of cold drawn steel pipe will continue to innovate and improve. With the intensification of market competition and the diversification of customer needs, cold drawn pipe will develop in the direction of high precision and high finish. In order to ensure the quality stability of the product, the surface flatness of the steel pipe needs to be tested during the production and processing of the steel pipe to ensure the surface finish and precision of the cold drawn steel pipe.

[0003] For example, the Chinese patent with publication number CN117722983A discloses a steel pipe out-of-roundness measuring device and method, which relates to the field of steel pipe measurement technology. A travel wheel is provided. When the first spline sleeve and the first spline shaft are in a mating state, the first spline shaft can drive the second spline shaft to rotate through the first spline sleeve, and the second spline shaft can drive the travel wheel to rotate. At the same time, when the cylindrical cam rotates, it can drive the first spline sleeve to move horizontally. When the first spline sleeve and the first spline shaft are out of mating, the rotation of the first spline shaft will no longer drive the travel wheel to rotate, and the device will not move. At this time, it can be carried out. For the measurement of the out-of-roundness of the steel pipe, the application also provides a detection rod. The movement of the first spline sleeve can drive the movement of the lead screw, the lead screw can drive the turntable to rotate, and the turntable can drive the detection rod to move radially along the turntable. When the first spline sleeve and the first spline shaft are out of engagement, the detection rod drives the sensing metal sheet and the proximity switch to cooperate. The proximity switch can control the operation of the laser rangefinder to measure the inner diameter of the steel pipe. When it is detected that the out-of-roundness exceeds the threshold, the second electric push rod can be operated, and the second electric push rod can push the pencil to mark on the paper strip, so as to mark the position where the out-of-roundness exists, so as to facilitate the subsequent processing of the steel pipe.

[0004] However, this patent cannot accurately locate the position where the steel pipe has non-roundness, cannot accurately display the size of the protrusions or depressions on the surface of the steel pipe, and cannot enable the staff to quickly locate the position of the corresponding concave and convex defects in the pipeline, affecting the efficiency of subsequent calculation and judgment. Summary of the invention

[0005] The technical problem to be solved by the present invention is: to overcome the defects of the existing technical problems and provide a device and method for detecting the surface flatness of a high-finish cold-drawn steel pipe, which can obtain the coordinates of various locations on the surface of the steel pipe, obtain a three-dimensional model of the steel pipe based on the coordinate data, mark the locations where depressions or protrusions appear, and obtain the unevenness of the locations.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: a surface flatness detection device for high-finish cold-drawn steel pipes, comprising a workbench, a rotatable rotating plate is provided on the workbench, a movable detection mechanism is provided on the rotating plate, the detection mechanism comprises a first laser rangefinder and a second laser rangefinder which can move relative to the rotating plate, the first laser rangefinder is arranged parallel to the axis of the rotating plate, and the output end of the first laser rangefinder is facing the side away from the rotating plate, the output end of the second laser rangefinder is arranged toward the axis of the rotating plate, the second laser rangefinder is located in the same plane as the first laser rangefinder, and the second laser rangefinder is perpendicular to the first laser rangefinder, a signal receiving plate on the workbench is fixedly provided on the side of the workbench away from the rotating plate, the signal receiving plate is used to receive the signal sent by the first laser rangefinder, a clamping mechanism is also provided on the workbench, the steel pipe to be detected is fixed on the clamping mechanism, and the rotating plate is coaxial with the clamping mechanism.

[0007] Furthermore, an electric push rod is fixedly mounted on the rotating plate, and the electric push rod is arranged parallel to the axial direction of the rotating plate. A detection base is fixedly mounted on the output end of the electric push rod, and the first laser rangefinder and the second laser rangefinder are fixedly mounted on the detection base.

[0008] Furthermore, the first laser rangefinder is vertically mounted on a side of the detection base away from the rotating plate, and the second laser rangefinder is vertically mounted on a side of the detection base facing the axis of the rotating plate.

[0009] Furthermore, the clamping mechanism includes a clamping seat, which is coaxial with the rotating plate, a first chuck is installed on the clamping seat on a side close to the rotating plate, a limit seat is fixedly provided on the signal receiving plate, and the clamping seat is fixedly installed on the limit seat.

[0010] Furthermore, the clamping mechanism also includes a driving cylinder fixedly mounted on the rotating plate near the side of the signal receiving plate, the driving cylinder is arranged perpendicular to the rotating plate, and the output end of the driving cylinder is rotatably mounted with a support seat, the support seat is coaxial with the rotating plate, and a second chuck is mounted on the support seat.

[0011] Furthermore, a processor is also provided on the workbench, and the processor is electrically connected to the signal receiving board, the first laser rangefinder and the second laser rangefinder.

[0012] Furthermore, a method for detecting the surface flatness of a high-finish cold-drawn steel tube is provided. The detection method is applicable to any one of the above-mentioned devices for detecting the surface flatness of a high-finish cold-drawn steel tube. The specific steps of the detection method are as follows:

[0013] S1: Establish a spatial coordinate system;

[0014] S2: Fix the steel pipe to be tested on the workbench;

[0015] S3: Adjust the position of the detection mechanism so that the second laser rangefinder can measure the distance between it and the outer wall of the steel pipe;

[0016] S4: The detection mechanism rotates around the steel pipe and moves along the axis of the steel pipe. The processor receives and processes the signals from the signal receiving board, the first laser rangefinder and the second laser rangefinder, obtains the coordinates G (x, y, z) of each position on the surface of the steel pipe, and obtains the three-dimensional model of the steel pipe based on the coordinates, and marks the unevenness of the steel pipe surface and obtains the corresponding unevenness γ.

[0017] Furthermore, the intersection of the axis of the rotating plate on the signal receiving plate and the signal receiving plate is set as the origin O, the horizontal direction is the x-axis, the horizontal right direction is the positive direction of the x-axis, the vertical direction is the y-axis, the vertical upward direction is the positive direction of the y-axis, the axis along the rotating plate is the z-axis, and the direction close to the rotating plate is the positive direction of the z-axis.

[0018] Furthermore, any point on the surface of the steel pipe is G, the value measured by the second laser rangefinder is recorded as h, the distance from the output end of the second laser rangefinder to the straight line where the first laser rangefinder is located is a constant value recorded as h1, the distance between the straight line where the first laser rangefinder is located and the axis of the rotating plate is a constant value recorded as h0, and the theoretical radius value of the steel pipe is recorded as r. The roughness of the steel pipe surface at point G can be calculated as follows: γ = h0-h1-rh, and:

[0019] When γ=0, it means that the surface flatness of the steel pipe at that location is qualified;

[0020] When γ>0, it means that there is a bulge on the surface of the steel pipe and the area is marked;

[0021] When γ<0, it means that there is a depression on the surface of the steel pipe and the area is marked.

[0022] Furthermore, the value measured by the first laser rangefinder is recorded as l1, and the distance from the output end of the first laser rangefinder to the straight line where the second laser rangefinder is located is a constant value recorded as l0. The coordinates of any point G on the surface of the steel pipe can be calculated as:

[0023] G(x=x1*(h0-h1-h) / h0, y= y1*(h0-h1-h) / h0, z=l1+l0).

[0024] By adopting the above technical solution, the present invention has the following beneficial effects:

[0025] 1. The distance from the second laser rangefinder to the first laser rangefinder and the axis of the rotating plate is a fixed value, and the radius of the steel pipe to be detected is a fixed value, then the theoretical value of the steel pipe surface measured by the second laser rangefinder can be obtained. The difference between the value measured by the second laser rangefinder and the theoretical value is the unevenness of the steel pipe surface at that location. When the difference is not 0, it means that the surface of the steel pipe is concave or convex;

[0026] 2. The data from the first laser rangefinder, the second laser rangefinder and the signal receiving board are combined and calculated by the processor to obtain the coordinates of each location on the surface of the steel pipe. The three-dimensional model of the steel pipe is obtained based on the coordinate data, and the locations where depressions or protrusions appear are marked. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The structure of the device for detecting the surface flatness of a high-finish cold-drawn steel pipe of the present invention is shown in FIG. Figure 1 ;

[0028] Figure 2 The structure of the device for detecting the surface flatness of a high-finish cold-drawn steel pipe of the present invention is shown in FIG. Figure 2 ;

[0029] Figure 3 The structure of the device for detecting the surface flatness of a high-finish cold-drawn steel pipe of the present invention is shown in FIG. Figure 3 ;

[0030] Figure 4 for Figure 2 A magnified view of part a in FIG.

[0031] Figure 5 It is a schematic diagram of the connection structure between the surface flatness detection device of the high-finish cold-drawn steel pipe of the present invention and the steel pipe;

[0032] Figure 6 It is a projection schematic diagram of each part of the present invention based on the xy plane;

[0033] Figure 7 It is a schematic diagram of projection of various parts of the present invention based on the xz plane.

[0034] Reference numerals: 1. workbench; 2. rotating plate; 3. detection mechanism; 4. clamping mechanism; 5. signal receiving board;

[0035] 6. Processor; 11. Drive motor; 12. Mounting plate; 13. Connecting plate; 14. Bearing seat;

[0036] 21. Electric push rod; 22. Connecting shaft; 31. Detection base; 32. First laser rangefinder;

[0037] 33. Second laser rangefinder; 41. Clamping seat; 42. First chuck; 43. Driving cylinder;

[0038] 44. Support seat; 45. Second chuck; 51. Limit seat; 100. Steel pipe. DETAILED DESCRIPTION

[0039] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0040] like Figure 1-5 As shown, in this embodiment, a device for detecting the surface flatness of a high-finish cold-drawn steel pipe is provided, comprising a workbench 1, a rotatable rotating plate 2 is provided on the workbench 1, a movable detecting mechanism 3 is provided on the rotating plate 2, and a clamping mechanism 4 is also provided on the workbench 1. The steel pipe 100 to be detected is fixed on the clamping mechanism 4, and the rotating plate 2 is coaxial with the clamping mechanism 4, so that the detecting mechanism 3 can rotate around the axis of the steel pipe 100.

[0041] like Figure 1-5 As shown, in this embodiment, an electric push rod 21 is fixedly mounted on the rotating plate 2, and the electric push rod 21 is arranged parallel to the axial direction of the rotating plate 2. The detection mechanism 3 is fixedly mounted on the output end of the electric push rod 21. The detection mechanism 3 includes a detection base 31 fixedly mounted on the output end of the electric push rod 21, and a first laser rangefinder 32 and a second laser rangefinder 33 are fixedly arranged on the detection base 31. The first laser rangefinder 32 is vertically mounted on the detection base 31 on a side away from the rotating plate 2, so that the first laser rangefinder 32 is arranged parallel to the axial direction of the rotating plate 2, and the output end of the first laser rangefinder 32 faces the side away from the rotating plate 2, and the second laser rangefinder 33 is vertically mounted on the detection base 31 on a side facing the axis of the rotating plate 2, so that the second laser rangefinder 33 and the first laser rangefinder 32 are located in the same plane, and the second laser rangefinder 33 is perpendicular to the first laser rangefinder 32, and the output end of the second laser rangefinder 33 is arranged toward the axis of the rotating plate 2.

[0042] like Figure 1-5As shown, in this embodiment, a signal receiving plate 5 is fixedly provided on the side of the workbench 1 away from the rotating plate 2. The signal receiving plate 5 is used to receive the signal emitted by the first laser rangefinder 32. The signal receiving plate 5 is arranged perpendicular to the workbench 1, and the first laser rangefinder 32 is perpendicular to the signal receiving plate 5.

[0043] like Figure 1-5 As shown, in this embodiment, the clamping mechanism 4 includes a clamping seat 41 fixedly mounted on the signal receiving plate 5, the clamping seat 41 is coaxial with the rotating plate 2, and a first chuck 42 is installed on the side of the clamping seat 41 close to the rotating plate 2. When in use, the steel pipe 100 is sleeved on the outside of the clamping seat 41, and the claws of the first chuck 42 abut against the inner wall of the steel pipe 100, thereby fixing the steel pipe 100.

[0044] like Figure 1-5 As shown, in the present embodiment, in order to improve the stability of clamping, the clamping mechanism 4 also includes a driving cylinder 43 fixedly mounted on the rotating plate 2 near the side of the signal receiving plate 5, the driving cylinder 43 is arranged perpendicular to the rotating plate 2, and the output end of the driving cylinder 43 is rotatably mounted with a support seat 44, the support seat 44 is coaxial with the rotating plate 2, and a second chuck 45 is mounted on the support seat 44. When one end of the steel pipe 100 is fixed, the driving cylinder 43 drives the second chuck 45 to move toward the steel pipe 100, so that the second chuck 45 extends into the steel pipe 100, and the claws of the second chuck 45 abut against the inner wall of the steel pipe 100, thereby further fixing the steel pipe 100.

[0045] like Figure 1-5 As shown, in this embodiment, the first chuck 42 and the second chuck 45 are both installed on the clamping seat 41 and the supporting seat 44 in the form of internal six-jaw chucks.

[0046] like Figure 1-5 As shown, in this embodiment, a limit seat 51 is fixedly provided on the signal receiving plate 5, and the clamping seat 41 is fixedly installed on the limit seat 51. The limit seat 51 is used to limit the clamping position of the steel pipe 100, so as to prevent the steel pipe 100 from being too close to the signal receiving plate 5, resulting in the first laser rangefinder 32 being unable to fully detect the surface of the steel pipe 100, and to prevent the first laser rangefinder 32 from colliding with the signal receiving plate 5 when moving and causing damage.

[0047] like Figure 1-5As shown, in the present embodiment, a driving motor 11 for driving the rotating plate 2 to rotate is fixedly provided on the workbench 1. Specifically, a mounting plate 12 is fixedly provided on the side of the workbench 1 away from the signal receiving plate 5. A connecting plate 13 is fixedly provided on the mounting plate 12. The driving motor 11 is fixedly installed on the connecting plate 13. A connecting shaft 22 is fixedly provided at the center of the rotating plate 2. The output end of the driving motor 11 is fixedly connected to the connecting shaft 22 through a bearing. In order to improve the connection strength between the driving motor 11 and the connecting shaft 22 to ensure the stability of the rotating plate 2 during rotation, a bearing seat 14 for supporting the connection between the output end of the driving motor 11 and the connecting shaft 22 is also fixedly provided on the connecting plate 13.

[0048] like Figure 1-5 As shown, in the present embodiment, when the rotating plate 2 rotates, the electric push rod 21 will be driven to rotate accordingly. When the electric push rod 21 rotates to the lowest point, that is, the height of the electric push rod 21 from the workbench 1 is the lowest, the connecting plate 13 is located above the electric push rod 21 to ensure that the connecting plate 13 will not hinder the rotation of the electric push rod 21 when the rotating plate 2 drives the electric push rod 21 to rotate.

[0049] like Figure 1-5 As shown, in this embodiment, a processor 6 is also provided on the workbench 1, and the processor 6 is electrically connected to the signal receiving board 5, the first laser rangefinder 32 and the second laser rangefinder 33. The processor 6 is used to receive and process the signals from the signal receiving board 5, the first laser rangefinder 32 and the second laser rangefinder 33, and organize and mark the processed signals.

[0050] like Figure 1-5 As shown, in this embodiment, the second laser rangefinder 33 faces the axis of the rotating plate 2, the distance from the second laser rangefinder 33 to the first laser rangefinder 32 and the axis of the rotating plate 2 is a constant, and the radius of the steel pipe 100 to be detected is a constant, then the theoretical value of the surface of the steel pipe 100 measured by the second laser rangefinder 33 can be known, and the difference between the value measured by the second laser rangefinder 33 and the theoretical value is the unevenness of the surface of the steel pipe 100 at that location. When the difference is not 0, it indicates that the surface of the steel pipe 100 has depressions or protrusions, and the data from the first laser rangefinder 32 and the signal receiving board 5 are combined through the processor 6 to calculate and obtain the coordinates of various locations on the surface of the steel pipe 100, and the three-dimensional model of the steel pipe 100 is obtained according to the coordinate data, and the positions where the depressions or protrusions appear are marked.

[0051] In this embodiment, a method for detecting the surface flatness of a high-finish cold-drawn steel pipe is also provided. The detection method is applicable to the surface flatness detection device of the steel pipe 100 described above. The specific steps of the detection method are as follows:

[0052] S1: Establish a spatial coordinate system. Specifically, the intersection of the axis of the clamping seat 41 on the signal receiving plate 5 and the rotating plate 2 and the signal receiving plate 5 is set as the origin O, the horizontal direction is the x-axis, the horizontal right direction is the positive direction of the x-axis, the vertical direction is the y-axis, the vertical upward direction is the positive direction of the y-axis, and the axis along the clamping seat 41 and the rotating plate 2 is the z-axis, wherein the direction close to the rotating plate 2 is the positive direction of the z-axis.

[0053] S2: Fix the steel pipe 100 to be inspected on the workbench 1. Specifically, sleeve the steel pipe 100 on the outside of the clamping seat 41, and the claws of the first chuck 42 abut against the inner wall of the steel pipe 100, so as to fix one end of the steel pipe 100. The driving cylinder 43 drives the second chuck 45 to move toward the steel pipe 100, so that the second chuck 45 extends into the steel pipe 100, and the claws of the second chuck 45 abut against the inner wall of the steel pipe 100, so as to further fix the steel pipe 100.

[0054] S3: Adjust the position of the detection mechanism 3 so that the second laser rangefinder 33 can measure the distance between it and the outer wall of the steel pipe 100. Specifically, the electric push rod 21 drives the detection device to move so that the second laser rangefinder 33 reaches the edge of the steel pipe 100 close to the rotating plate 2.

[0055] S4: The detection mechanism 3 rotates around the steel pipe 100 and moves along the axis of the steel pipe 100. The processor 6 receives and processes the signals from the signal receiving board 5, the first laser rangefinder 32 and the second laser rangefinder 33, obtains the coordinates G (x, y, z) of each position on the surface of the steel pipe 100, and obtains the three-dimensional model of the steel pipe 100 based on the coordinates, and marks the uneven parts on the surface of the steel pipe 100 and obtains the corresponding unevenness γ.

[0056] Specifically, in the spatial coordinate system, the coordinates of any point G on the surface of the steel pipe 100 are marked as G (x, y, z), such as Figure 6 As shown, based on the xy plane, the point projected on the xy plane by the first laser rangefinder 32 is recorded as A, the point projected on the xy plane by the second laser rangefinder 33 is recorded as B, and any point on the surface of the steel pipe 100 is G. The value measured by the second laser rangefinder 33, that is, the distance between B and G is recorded as h (in mm). The distance from the output end of the second laser rangefinder 33 to the straight line where the first laser rangefinder 32 is located is a constant, that is, the distance between A and B is recorded as h1 (in mm). The distance between the straight line where the first laser rangefinder 32 is located and the axis of the rotating plate 2 is the distance from point A to the origin O. This distance is a constant, recorded as h0 (in mm). The theoretical radius value of the steel pipe 100 is recorded as r (in mm). The coordinates of point A projected on the xy plane by the first laser rangefinder 32 on the xy plane are x1, y1, and then it can be obtained:

[0057] Theoretical distance between B and G: h ， =h0-h1-r ①

[0058] The difference between the theoretical distance and the actual distance between B and G can reflect the unevenness of the surface of the steel pipe 100:

[0059] γ = h ， -h ②

[0060] Combining formulas ①-②, we can get: γ= h0-h1-rh ③

[0061] According to the calculated roughness value, the following conclusions can be drawn:

[0062] When γ=0, it means that the surface flatness of the steel pipe 100 at that location is qualified;

[0063] When γ>0, it means that there is a bulge on the surface of the steel pipe 100 at that location and the location is marked;

[0064] When γ<0, it means that there is a depression on the surface of the steel pipe 100 at that location and the location is marked;

[0065] The distance between point G and the origin O, that is, the actual radius value at point G on the steel pipe 100, is:

[0066] r ， = h0-h1-h ④

[0067] The angle between the line AO ​​and the x-axis is α, the angle between the line AO ​​and the y-axis is β, the coordinates of point G on the xy plane are (x, y), then:

[0068] sinα=x1 / h0=x / r ， ⑤

[0069] sinβ = y1 / h0 = y / r ， ⑥

[0070] Combining formulas ④-⑥, we can get:

[0071] x= x1* r ， / h0=x1*(h0-h1-h) / h0,y=y1*r ， / h0=y1*(h0-h1-h) / h0 ⑦

[0072] like Figure 7As shown, based on the xz plane, the intersection of the straight line where the first laser rangefinder 32 and the second laser rangefinder 33 are located is recorded as M, the point projected on the xz plane by the first laser rangefinder 32 is recorded as D, the point projected on the xz plane by the second laser rangefinder 33 is recorded as C, any point on the surface of the steel pipe 100 is G, the value measured by the first laser rangefinder 32 is recorded as l1 (in mm), the distance from the output end of the first laser rangefinder 32 to the straight line where the second laser rangefinder 33 is located, that is, the distance from point D to point M is a constant value, recorded as l0 (in mm), then the distance between the straight line where the second laser rangefinder 33 is located and the signal receiving board 5 can be obtained:

[0073] l=l1+l0 ⑧

[0074] Since the three points M, C, and G are in the same plane, the distance between point G and the signal receiving plate 5 is equal to the distance between the straight line where the second laser rangefinder 33 is located and the signal receiving plate 5, and the coordinate of point G on the z-axis can be obtained:

[0075] z=l ⑨

[0076] Combining formula ⑧-⑨, we can get z=l=l1+l0,

[0077] In summary, the coordinates of any point G on the surface of the steel pipe 100 can be obtained as:

[0078] G (x=x1*(h0-h1-h) / h0, y=y1*(h0-h1-h) / h0, z=l1+l0), the detection mechanism 3 rotates around the steel pipe 100 and moves along the axis of the steel pipe 100 to obtain the coordinates of various locations on the surface of the steel pipe 100. The processor 6 collects the data and draws a three-dimensional structural model of the steel pipe 100, and compares the actual value h measured by the second laser rangefinder 33 with the theoretical value h ， By comparison, it is determined whether the flatness of the surface of the steel pipe 100 meets the requirements. Specifically,

[0079] When h ， =h, it means that the surface flatness of the steel pipe 100 at that location is qualified;

[0080] When h ， >h, it indicates that there is a bulge on the surface of the steel pipe 100;

[0081] When h ， When <h, it means that there is a depression on the surface of the steel pipe 100 at that location;

[0082] The unevenness of the surface of the steel pipe 100 can be obtained, that is, the difference between the value h actually measured by the second laser rangefinder 33 and the theoretical value h ， The difference: γ = h0-h1-rh,

[0083] When γ=0, it means that the surface flatness of the steel pipe 100 at that location is qualified;

[0084] When γ>0, it means that there is a bulge on the surface of the steel pipe 100 at that location and the location is marked;

[0085] When γ<0, it indicates that there is a depression on the surface of the steel pipe 100 at that location and the location is marked.

[0086] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for detecting the surface flatness of a high-finish cold-drawn steel tube, comprising a workbench (1), characterized in that: The workbench (1) is provided with a rotatable rotating plate (2), and the rotating plate (2) is provided with a movable detection mechanism (3), the detection mechanism (3) comprising a first laser rangefinder (32) and a second laser rangefinder (33) which are movable relative to the rotating plate (2), the first laser rangefinder (32) being arranged parallel to the axis of the rotating plate (2), and the output end of the first laser rangefinder (32) facing the side away from the rotating plate (2), the output end of the second laser rangefinder (33) facing the axis of the rotating plate (2), and the second laser rangefinder (33) being arranged at a position close to the first laser rangefinder (32). The workbench (1) is provided with a signal receiving plate (5) on the workbench (1) at a side away from the rotating plate (2), and the signal receiving plate (5) is used to receive the signal sent by the first laser rangefinder (32). The workbench (1) is also provided with a clamping mechanism (4), and the steel pipe (100) to be inspected is fixed on the clamping mechanism (4). The rotating plate (2) is coaxial with the clamping mechanism (4), and the clamping mechanism (4) comprises a clamping seat (41), and the clamping seat (41) is coaxial with the rotating plate (2). The clamping seat (41) is provided with a first chuck (42) on one side close to the rotating plate (2); a limit seat (51) is fixedly provided on the signal receiving plate (5); the clamping seat (41) is fixedly mounted on the limit seat (51); the clamping mechanism (4) further comprises a driving cylinder (43) fixedly mounted on one side of the rotating plate (2) close to the signal receiving plate (5); the driving cylinder (43) is arranged perpendicular to the rotating plate (2); and a supporting seat (44) is rotatably mounted on the output end of the driving cylinder (43); the supporting seat (44) is coaxial with the rotating plate (2); and the supporting seat (44) is A second chuck (45) is installed, and a processor (6) is also provided on the workbench (1), and the processor (6) is electrically connected to the signal receiving board (5), the first laser rangefinder (32) and the second laser rangefinder (33). The processor (6) calculates the coordinates G (x, y, z) of each position on the surface of the steel pipe (100) based on the data fed back by the signal receiving board (5), the first laser rangefinder (32) and the second laser rangefinder (33), and obtains a three-dimensional model of the steel pipe (100) based on the coordinates, and marks the unevenness of the surface of the steel pipe (100) and obtains the corresponding unevenness γ.

2. The device for detecting surface flatness of a high-finish cold-drawn steel pipe according to claim 1, characterized in that: An electric push rod (21) is fixedly mounted on the rotating plate (2), the electric push rod (21) being arranged parallel to the axial direction of the rotating plate (2), a detection base (31) is fixedly mounted on the output end of the electric push rod (21), and the first laser rangefinder (32) and the second laser rangefinder (33) are fixedly mounted on the detection base (31).

3. The device for detecting surface flatness of a high-finish cold-drawn steel pipe according to claim 2, characterized in that: The first laser rangefinder (32) is vertically mounted on a side of the detection base (31) away from the rotating plate (2), and the second laser rangefinder (33) is vertically mounted on a side of the detection base (31) facing the axis of the rotating plate (2).

4. A method for detecting the surface flatness of a high-finish cold-drawn steel tube, the method being applicable to the device for detecting the surface flatness of a high-finish cold-drawn steel tube as claimed in any one of claims 1 to 3, and the specific steps of the method are as follows: S1: Establish a spatial coordinate system; S2: fixing the steel pipe (100) to be tested on the workbench (1); S3: adjusting the position of the detection mechanism (3) so that the second laser rangefinder (33) can measure the distance between it and the outer wall of the steel pipe (100); S4: The detection mechanism (3) rotates around the steel pipe (100) and moves along the axis of the steel pipe (100), and the processor (6) receives and processes the signals from the signal receiving board (5), the first laser rangefinder (32) and the second laser rangefinder (33), obtains the coordinates G (x, y, z) of each position on the surface of the steel pipe (100), and obtains a three-dimensional model of the steel pipe (100) based on the coordinates, and marks the unevenness of the surface of the steel pipe (100) and obtains the corresponding unevenness γ.

5. A method for detecting surface flatness of a high-finish cold-drawn steel pipe according to claim 4, characterized in that: The intersection of the axis of the rotating plate (2) on the signal receiving plate (5) and the signal receiving plate (5) is set as the origin O, the horizontal direction is the x-axis, the horizontal rightward direction is the positive direction of the x-axis, the vertical direction is the y-axis, the vertical upward direction is the positive direction of the y-axis, the axis along the rotating plate (2) is the z-axis, and the direction close to the rotating plate (2) is the positive direction of the z-axis.

6. A method for detecting surface flatness of a high-finish cold-drawn steel tube according to claim 5, characterized in that: An arbitrary point on the surface of the steel pipe (100) is G, the value measured by the second laser rangefinder (33) is recorded as h, the distance from the output end of the second laser rangefinder (33) to the straight line where the first laser rangefinder (32) is located is a constant value recorded as h1, the distance from the straight line where the first laser rangefinder (32) is located to the axis of the rotating plate (2) is a constant value recorded as h0, and the theoretical radius value of the steel pipe (100) is recorded as r. The roughness of the surface of the steel pipe (100) at point G can be calculated as follows: γ=h0-h1-rh, and When γ=0, it means that the surface flatness of the steel pipe (100) at that location is qualified; When γ>0, it means that there is a bulge on the surface of the steel pipe (100) at that location and the location is marked; When γ<0, it indicates that there is a depression on the surface of the steel pipe (100) at that location and the location is marked.

7. The method for detecting the surface flatness of a high-finish cold-drawn steel tube according to claim 5, characterized in that: The value measured by the first laser rangefinder (32) is recorded as l1, and the distance from the output end of the first laser rangefinder (32) to the straight line where the second laser rangefinder (33) is located is a constant value recorded as l0. The coordinates of any point G on the surface of the steel pipe (100) can be calculated as: G (x=x1*(h0-h1-h) / h0, y=y1*(h0-h1-h) / h0, z=l1+l0).

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