A high-precision non-contact profilometer

Abstract

The application belongs to the technical field of profile detection equipment, and particularly relates to a high-precision non-contact profilometer, which comprises a bottom plate, the top surface of the bottom plate is provided with an electric guide rail and a measuring instrument, the electric guide rail is slidably connected with a sliding block, the sliding block is provided with a moving mechanism, the measuring instrument is provided with a measuring area, the measuring area is provided with a group of high-precision cameras, the bottom surface of the bottom plate is provided with an industrial computer, the moving mechanism comprises a connecting block fixed on the sliding block, a workpiece to be measured is placed into a connecting sleeve, at this time, an elastic ring exerts pressure on the workpiece to fix the workpiece, the elastic ring can adapt to workpieces of different shapes to improve the convenience and precision of measurement, then the electric guide rail drives the sliding block to move, so that the connecting block drives the workpiece into the measuring area, at this time, the high-precision cameras can take pictures of the workpiece for measurement.

Description

Technical Field

[0001] The invention belongs to the technical field of contour detection equipment, in particular to a high-precision non-contact contour meter. Background Art

[0002] The high-precision non-contact profilometer has an integrated length gauge inside, which can calculate and measure the length of the material to be tested. The measurement area integrates four high-precision cameras, which combine multi-eye stereo vision and structured light technology to achieve fast and high-resolution 3D surface measurement. The cameras are symmetrically distributed and synchronously capture the surface morphology of the object. The micro-profile is reconstructed through triangulation and image matching algorithms. The vertical resolution can reach sub-micron level. The ring structure can support 360° full-circle scanning, which is suitable for non-destructive testing of complex surfaces or precision components.

[0003] However, the above technologies often have the following defects: during the workpiece contour measurement process, the workpiece needs to pass through the measurement area. However, due to the diversity of workpiece shapes (such as cylinders, special-shaped parts, thin-walled parts, etc.), traditional fixing and transportation methods face many challenges: First, workpieces with different geometric features require customized fixtures, resulting in poor equipment compatibility and low changeover efficiency. Thin-walled or flexible workpieces may be deformed due to improper clamping force. These problems not only increase the complexity of the measurement system, but may also cause data distortion or poor repeatability. For this reason, the present invention provides a high-precision non-contact profilometer. Summary of the Invention

[0004] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0005] The technical solution adopted by the present invention to solve its technical problems is: the high-precision non-contact profilometer described in the present invention includes a base plate, the top surface of the base plate is provided with an electric guide rail and a measuring instrument, the electric guide rail is slidably connected to a slider, and the slider is provided with a moving mechanism; the measuring instrument is provided with a measuring area, the measuring area is provided with a group of high-precision cameras, and the bottom surface of the base plate is provided with an industrial computer; the moving mechanism includes a connecting block fixed on the slider, the connecting block is provided with a connecting sleeve on the side close to the measuring instrument, and a hollow elastic ring is provided inside the connecting sleeve.

[0006] The inner wall of the connecting sleeve is sealingly and slidingly connected to a connecting disk, and the connecting sleeve is fixedly connected to an electromagnet on one side of the inner wall close to the connecting block. The electromagnet and the connecting disk are magnetically attracted to each other, and the elastic ring is fixedly connected to the connecting disk. A group of connecting holes are provided on the connecting disk and the elastic ring, and a first spring is fixedly connected between the side of the connecting disk close to the electromagnet and the inner wall of the connecting sleeve.

[0007] A movable groove is provided on the side of the connecting disk away from the connecting block, a disc is sealingly and slidingly connected in the movable groove, a group of air outlet holes connected to the movable groove are provided on the side of the disc close to the elastic ring, and a driving component for driving the disc to move is provided in the connecting sleeve.

[0008] The driving assembly includes a magnetic rod, which is fixedly connected to the side of the disc close to the electromagnet, and is sealed and slidably connected to the side wall of the disc. The magnetic rod and the electromagnet are magnetically attracted to each other, and a reset spring is fixedly connected between the side of the disc close to the magnetic rod and the inner wall of the movable groove.

[0009] A hollow groove is provided in the connecting sleeve, a group of through holes connected to the hollow groove are provided on the outer wall of the connecting sleeve, a connecting groove connected to the hollow groove is provided on the inner wall of the connecting sleeve, and a sealing component for sealing the connecting hole is provided in the connecting sleeve.

[0010] The sealing assembly includes a sealing ring that is slidably connected to the inner wall of the connecting sleeve, and the sealing ring is used to seal the air inlet end of the connecting groove. A group of sealing columns that seal the connecting hole are fixedly connected to the side of the sealing ring close to the connecting disk, and a second spring is fixedly connected between the side of the sealing ring close to the electromagnet and the inner wall of the connecting sleeve.

[0011] The outer wall of the connecting sleeve is fixedly connected with a connecting rod, a sliding groove is provided at the top of the connecting rod, a sliding rod is slidably connected to the inner wall of the sliding groove, a third spring is fixedly connected between the bottom surface of the sliding rod and the inner wall of the sliding groove, and a positioning plate is fixedly connected to the top surface of the sliding rod.

[0012] A group of card slots are provided on the side wall of the sliding rod, and a card block is slidably connected to the side wall of the connecting rod, and the card block is card-engaged with the card slots.

[0013] Both sides of the positioning plate are slidably connected with moving rods, the sides of the moving rods close to each other are fixedly connected with a clamping plate, and a fourth spring is fixedly connected between the side of the clamping plate close to the moving rod and the positioning plate.

[0014] The bottom surface of the positioning plate is rotatably connected to a group of rotating shafts, and a connecting line is fixedly connected between the side wall of the rotating shaft and the moving rod, the side wall of the rotating shaft is fixedly connected to the first connecting plate, and the surface of the rotating shaft is fixedly connected to the limiting ring, the center part of the positioning plate is slidably connected to a round rod, and the side wall of the round rod is fixedly connected to a pair of second connecting plates, the first connecting plate is fitted with the second connecting plate, and the bottom surface of the round rod is fixedly connected to a sixth spring, and the bottom end of the sixth spring is fixedly connected to a fixed block in contact with the limiting ring.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The present invention places the workpiece to be measured into the connecting sleeve. At this time, the elastic ring will apply pressure to the workpiece to fix the workpiece. The elastic ring can adapt to workpieces of different shapes, thereby improving the convenience and accuracy of measurement. Then, the electric guide rail drives the slider to move, so that the connecting block drives the workpiece into the measurement area. At this time, the high-precision camera will shoot and measure the workpiece.

[0017] 2. The present invention activates the electromagnet to attract the connecting disk, which then pushes the gas in the connecting sleeve, causing the gas to enter the elastic ring from the connecting hole. The elastic ring then expands, thereby applying greater pressure to the workpiece to improve the effect of fixing the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 It is a structural schematic diagram of the profilometer in the present invention;

[0020] Figure 2 It is a structural schematic diagram of the mobile mechanism of the present invention;

[0021] Figure 3 yes Figure 2 Partial structural cross-sectional view

[0022] Figure 4 yes Figure 3 A magnified view of point A;

[0023] Figure 5 yes Figure 3 Enlarged view of point B;

[0024] Figure 6 It is a structural schematic diagram of the positioning plate in the present invention;

[0025] Figure 7 In the present invention Figure 6 Enlarged view of point C.

[0026] In the figure: 1. Base plate; 2. Measuring instrument; 3. Measuring area; 4. Electric guide rail; 5. Slider; 6. Connecting block; 7. Industrial computer; 8. Connecting wire; 9. Connecting sleeve; 10. Elastic ring; 11. Electromagnet; 12. Connecting hole; 13. Moving groove; 14. Air outlet; 15. Disc; 16. Magnetic rod; 17. Hollow groove; 18. Through hole; 19. Connecting groove; 20. Sealing ring; 21. Sealing column; 22. Connecting disc; 23. Connecting rod; 24. Sliding rod; 25. Positioning plate; 26. Clamp; 27. Moving rod; 28. Slot; 29. ​​Block; 30. Slide; 31. First connecting plate; 32. Rotating shaft; 33. Limiting ring; 34. Round rod; 35. Fixed block; 36. Second connecting plate. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0028] Example 1: Figures 1 to 5 As shown, a high-precision non-contact profilometer according to an embodiment of the present invention includes a base plate 1, the top surface of which is provided with an electric guide rail 4 and a measuring instrument 2, a slider 5 slidably connected to the electric guide rail 4, and the slider 5 is provided with a moving mechanism; a measuring area 3 is provided on the measuring instrument 2, and a group of high-precision cameras are provided in the measuring area 3, and an industrial computer 7 is provided on the bottom surface of the base plate 1; the moving mechanism includes a connecting block 6 fixed to the slider 5, and a connecting sleeve 9 is provided on the side of the connecting block 6 close to the measuring instrument 2, and a hollow elastic ring 10 is provided inside the connecting sleeve 9; by placing the workpiece to be measured in the connecting sleeve 9, the elastic ring 10 applies pressure to the workpiece to fix the workpiece, and the elastic ring 10 can adapt to workpieces of different shapes, thereby improving the convenience and accuracy of measurement, and then the electric guide rail 4 drives the slider 5 to move, so that the connecting block 6 drives the workpiece into the measuring area 3, and the high-precision camera takes a picture of the workpiece and feeds the captured data back to the industrial computer 7, which is responsible for calculating the product's external dimensions and profile.

[0029] The inner wall of the connecting sleeve 9 is sealed and slidably connected with a connecting disk 22, and the connecting sleeve 9 is fixedly connected to an electromagnet 11 on one side of the inner wall close to the connecting block 6. The electromagnet 11 and the connecting disk 22 are magnetically attracted, and the elastic ring 10 is fixedly connected to the connecting disk 22. A group of connecting holes 12 are provided on the connecting disk 22 and the elastic ring 10. A first spring is fixedly connected between the side of the connecting disk 22 close to the electromagnet 11 and the inner wall of the connecting sleeve 9; after the workpiece in the present application is placed in the connecting sleeve 9, the electromagnet 11 can be started so that the electromagnet 11 attracts the connecting disk 22. At this time, the connecting disk 22 will push the gas in the connecting sleeve 9, so that the gas enters the elastic ring 10 from the connecting hole 12. At this time, the elastic ring 10 will expand, thereby applying greater pressure on the workpiece to improve the effect of fixing the workpiece.

[0030] A movable groove 13 is provided on the side of the connecting disk 22 away from the connecting block 6, and a disc 15 is sealed and slidably connected in the movable groove 13. A group of air outlet holes 14 connected to the movable groove 13 are provided on the side of the disc 15 close to the elastic ring 10, and a driving component for driving the disc 15 to move is provided in the connecting sleeve 9; after the workpiece in the present application is placed in the connecting sleeve 9, the driving component can be used to drive the disc 15 to move, and at this time the disc 15 will push the gas in the movable groove 13, so that the gas is blown onto the workpiece from the air outlet 14, thereby blowing away dust and impurities on the workpiece, so as to improve the clarity of the workpiece when subsequently photographed by a high-precision camera.

[0031] The driving assembly includes a magnetic rod 16, which is fixedly connected to the side of the disk 15 close to the electromagnet 11, and the magnetic rod 16 is sealed and slidably connected to the side wall of the disk 15. The magnetic rod 16 and the electromagnet 11 are magnetically attracted to each other, and a return spring (not shown in the figure) is fixedly connected between the side of the disk 15 close to the magnetic rod 16 and the inner wall of the movable groove 13; when the electromagnet 11 in the present application is started, it will attract the magnetic rod 16, so that the magnetic rod 16 drives the disk 15 to move, thereby pushing the gas in the movable groove 13 to be ejected from the air outlet 14.

[0032] A hollow groove 17 is provided in the connecting sleeve 9, and a group of through holes 18 connected to the hollow groove 17 are provided on the outer wall of the connecting sleeve 9. A connecting groove 19 connected to the hollow groove 17 is provided on the inner wall of the connecting sleeve 9. A sealing component for sealing the connecting hole 12 is provided in the connecting sleeve 9; after long-term use, the high-precision camera in the present application will inevitably have dust attached to the lens. In order not to affect the measurement accuracy, the connecting sleeve 9 can be controlled to move to the measurement area 3, and then the connecting hole 12 is sealed with the help of the sealing component. At this time, the connecting disk 22 can be driven to move with the help of the electromagnet 11, so that the connecting disk 22 pushes the gas in the connecting sleeve 9 from the connecting groove 19 into the hollow groove 17, and finally the gas is blown onto the high-precision camera from the through hole 18, thereby blowing away the dust on the lens to improve the subsequent measurement accuracy.

[0033] The sealing assembly includes a sealing ring 20 that is slidably connected to the inner wall of the connecting sleeve 9, and the sealing ring 20 is used to seal the air inlet end of the connecting groove 19. The sealing ring 20 is fixedly connected to a side close to the connecting disk 22 with a group of sealing columns 21 that seal the connecting hole 12, and the sealing ring 20 is fixedly connected to the side close to the electromagnet 11 with a second spring between the inner wall of the connecting sleeve 9; when it is necessary to inject gas into the hollow groove 17, the present application can increase the magnetic force of the electromagnet 11 so that the connecting disk 22 is sucked into contact with the sealing column 21, and then the sealing column 21 will seal the connecting hole 12, and then the connecting disk 22 continues to be sucked, so that the sealing ring 20 is pushed, thereby no longer sealing the connecting groove 19, and at this time the connecting disk 22 can push the gas in the connecting sleeve 9 from the connecting groove 19 into the hollow groove 17.

[0034] The outer wall of the connecting sleeve 9 is fixedly connected with a connecting rod 23, the top of the connecting rod 23 is provided with a slide groove 30, the inner wall of the slide groove 30 is slidably connected with a slide rod 24, a third spring is fixedly connected between the bottom surface of the slide rod 24 and the inner wall of the slide groove 30, and the top surface of the slide rod 24 is fixedly connected with a positioning plate 25; by placing the workpiece on the positioning plate 25, the workpiece can be centered, and then the workpiece is pushed into the connecting sleeve 9, and then the workpiece is fixed with the help of the elastic ring 10 to prevent the workpiece from tilting during the process of the elastic ring 10.

[0035] A group of slots 28 are formed on the side wall of the slide rod 24, and a block 29 is slidably connected to the side wall of the connecting rod 23, and the block 29 is engaged with the slot 28; due to the different sizes of workpieces, in order to allow workpieces of different sizes to be placed as centered as possible, the block 29 can be pulled out of the slot 28 first, and then the slide rod 24 can be moved to adjust the position of the positioning plate 25 to adapt to different workpieces.

[0036] Both sides of the positioning plate 25 are slidably connected with moving rods 27, and the side of the moving rods 27 close to each other is fixedly connected with a clamping plate 26, and the side of the clamping plate 26 close to the moving rod 27 is fixedly connected with a fourth spring between the positioning plate 25; by pulling the moving rod 27 to move the clamping plates 26 away from each other, and then placing the workpiece on the positioning plate 25, the moving rod 27 is released, so that the fourth spring pushes the clamping plate 26, so that the clamping plate 26 clamps the workpiece to improve the stability of the workpiece on the positioning plate 25.

[0037] Example 2: Figures 6 and 7As shown, in contrast to Example 1, another embodiment of the present invention is as follows: the bottom surface of the positioning plate 25 is rotatably connected to a set of rotating shafts 32, a connecting line 8 is fixedly connected between the side wall of the rotating shaft 32 and the moving rod 27, the side wall of the rotating shaft 32 is fixedly connected to the first connecting plate 31, and the surface of the rotating shaft 32 is fixedly connected to the limiting ring 33, the center part of the positioning plate 25 is slidably connected to a round rod 34, the side wall of the round rod 34 is fixedly connected to a pair of second connecting plates 36, the first connecting plate 31 is fitted with the second connecting plate 36, and the round rod The bottom surface of 34 is fixedly connected with a sixth spring, and the bottom end of the sixth spring is fixedly connected with a fixed block 35 in contact with the limit ring 33; the rotating shaft 32 can be limited by the fit between the first connecting plate 31 and the second connecting plate 36. At this time, the connecting line 8 will pull the moving rod 27. After the workpiece is placed on the positioning plate 25, the workpiece will press the round rod 34 downward so that the first connecting plate 31 and the second connecting plate 36 are no longer in contact. At this time, the rotating shaft 32 can be rotated, so that the connecting line 8 can be loosened, and the fourth spring will push the clamping plate 26 to clamp the workpiece.

[0038] Working principle: by placing the workpiece to be measured into the connecting sleeve 9, the elastic ring 10 will apply pressure to the workpiece to fix the workpiece. The elastic ring 10 can adapt to workpieces of different shapes, thereby improving the convenience and accuracy of measurement. Then, the electric guide rail 4 drives the slider 5 to move, so that the connecting block 6 drives the workpiece into the measuring area 3. At this time, the high-precision camera will take a picture of the workpiece and feed the photographed data back to the industrial computer 7. The industrial computer 7 is used to calculate the external dimensions and contour of the product; after the workpiece in this application is placed in the connecting sleeve 9, the electromagnet 11 can be started so that the electromagnet 11 attracts the connecting disk 22. At this time, the connecting disk 22 will push the gas in the connecting sleeve 9, so that the gas enters the elastic ring 10 from the connecting hole 12. At this time, the elastic ring 10 will expand, thereby applying greater pressure on the workpiece to improve the effect of fixing the workpiece;

[0039] After the workpiece in the present application is placed in the connecting sleeve 9, the disc 15 can be driven to move by the driving assembly. At this time, the disc 15 will push the gas in the movable groove 13, so that the gas is blown onto the workpiece from the air outlet 14, thereby blowing away dust and impurities on the workpiece to improve the clarity of the workpiece when subsequently photographed by a high-precision camera; when the electromagnet 11 in the present application is started, it will attract the magnetic rod 16, so that the magnetic rod 16 drives the disc 15 to move and push the gas in the movable groove 13 to be ejected from the air outlet 14;

[0040] After long-term use, the high-precision camera in the present application will inevitably have dust attached to the lens. In order not to affect the measurement accuracy, the connecting sleeve 9 can be controlled to move to the measuring area 3, and then the connecting hole 12 can be sealed with the help of the sealing assembly. At this time, the connecting disk 22 can be driven to move by the electromagnet 11, so that the connecting disk 22 pushes the gas in the connecting sleeve 9 from the connecting groove 19 into the hollow groove 17, and finally the gas is blown onto the high-precision camera from the through hole 18, thereby blowing away the dust on the lens to improve the subsequent measurement accuracy; when it is necessary to inject gas into the hollow groove 17, the present application can increase the magnetic force of the electromagnet 11 so that the connecting disk 22 is sucked into contact with the sealing column 21. At this time, the sealing column 21 will seal the connecting hole 12, and then the connecting disk 22 continues to be sucked, so that the sealing ring 20 is pushed, thereby no longer sealing the connecting groove 19. At this time, the connecting disk 22 can push the gas in the connecting sleeve 9 from the connecting groove 19 into the hollow groove 17;

[0041] By placing the workpiece on the positioning plate 25, the workpiece can be centered, and then the workpiece is pushed into the connecting sleeve 9, and then the workpiece is fixed with the help of the elastic ring 10 to prevent the workpiece from tilting during the process of the elastic ring 10 passing through the workpiece; due to the different sizes of the workpieces, in order to allow workpieces of different sizes to be placed as centered as possible, the block 29 can be pulled out of the slot 28 first, and then the slide bar 24 can be moved to adjust the position of the positioning plate 25 to adapt to different workpieces; by pulling the moving rod 27, the clamps 26 are moved away from each other, and then the workpiece is placed on the positioning plate 25, and then the moving rod 27 is released, so that the fourth spring pushes the clamp 26, so that the clamp 26 clamps the workpiece to improve the stability of the workpiece on the positioning plate 25.

[0042] The above-mentioned front, back, left, right, up and down are all based on the Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0044] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision non-contact profilometer, comprising a base plate (1), the top surface of the base plate (1) being provided with an electric guide rail (4) and a measuring instrument (2), a slider (5) being slidably connected to the electric guide rail (4), and the slider (5) being provided with a moving mechanism; Its characteristics are: The measuring instrument (2) is provided with a measuring area (3), the measuring area (3) is provided with a group of high-precision cameras, and the bottom surface of the bottom plate (1) is provided with an industrial computer (7); The moving mechanism comprises a connecting block (6) fixed on a slider (5), a connecting sleeve (9) being provided on a side of the connecting block (6) close to the measuring instrument (2), and a hollow elastic ring (10) being provided inside the connecting sleeve (9); The inner wall of the connecting sleeve (9) is sealed and slidably connected to a connecting disk (22); the inner wall side of the connecting sleeve (9) close to the connecting block (6) is fixedly connected to an electromagnet (11); the electromagnet (11) and the connecting disk (22) are magnetically attracted; the elastic ring (10) is fixedly connected to the connecting disk (22); a group of communicating connecting holes (12) are provided on the connecting disk (22) and the elastic ring (10); a first spring is fixedly connected between the side of the connecting disk (22) close to the electromagnet (11) and the inner wall of the connecting sleeve (9); A movable groove (13) is provided on a side of the connecting disk (22) away from the connecting block (6), a disc (15) is sealed and slidably connected in the movable groove (13), a group of air outlet holes (14) in communication with the movable groove (13) are provided on a side of the disc (15) close to the elastic ring (10), and a driving component for driving the disc (15) to move is provided in the connecting sleeve (9); The driving assembly includes a magnetic rod (16), the magnetic rod (16) is fixedly connected to a side of the disk (15) close to the electromagnet (11), the magnetic rod (16) is sealingly slidably connected to the side wall of the disk (15), the magnetic rod (16) and the electromagnet (11) are magnetically attracted, and a return spring is fixedly connected between a side of the disk (15) close to the magnetic rod (16) and the inner wall of the movable groove (13); A hollow groove (17) is provided in the connecting sleeve (9), a group of through holes (18) communicating with the hollow groove (17) are provided on the outer wall of the connecting sleeve (9), a connecting groove (19) communicating with the hollow groove (17) is provided on the inner wall of the connecting sleeve (9), and a sealing component for sealing the connecting hole (12) is provided in the connecting sleeve (9); The sealing assembly includes a sealing ring (20) slidably connected to the inner wall of the connecting sleeve (9), the sealing ring (20) is used to seal the air inlet end of the connecting groove (19), a group of sealing columns (21) for sealing the connecting hole (12) are fixedly connected to the side of the sealing ring (20) close to the connecting disk (22), and a second spring is fixedly connected between the side of the sealing ring (20) close to the electromagnet (11) and the inner wall of the connecting sleeve (9); The outer wall of the connecting sleeve (9) is fixedly connected to a connecting rod (23), a sliding groove (30) is provided at the top of the connecting rod (23), the inner wall of the sliding groove (30) is slidably connected to a sliding rod (24), a third spring is fixedly connected between the bottom surface of the sliding rod (24) and the inner wall of the sliding groove (30), and a positioning plate (25) is fixedly connected to the top surface of the sliding rod (24).

2. A high-precision non-contact profilometer according to claim 1, characterized in that: A group of slots (28) are provided on the side wall of the slide rod (24), and a block (29) is slidably connected to the side wall of the connecting rod (23), and the block (29) is engaged with the slots (28).

3. A high-precision non-contact profilometer according to claim 2, characterized in that: Both sides of the positioning plate (25) are slidably connected to moving rods (27), the sides of the moving rods (27) close to each other are fixedly connected to a clamping plate (26), and a fourth spring is fixedly connected between the side of the clamping plate (26) close to the moving rod (27) and the positioning plate (25).

4. A high-precision non-contact profilometer according to claim 3, characterized in that: The bottom surface of the positioning plate (25) is rotatably connected to a group of rotating shafts (32), a connecting line (8) is fixedly connected between the side wall of the rotating shaft (32) and the moving rod (27), the side wall of the rotating shaft (32) is fixedly connected to the first connecting plate (31), and the surface of the rotating shaft (32) is fixedly connected to the limit ring (33), the central part of the positioning plate (25) is slidably connected to a round rod (34), the side wall of the round rod (34) is fixedly connected to a pair of second connecting plates (36), the first connecting plate (31) is fitted with the second connecting plate (36), the bottom surface of the round rod (34) is fixedly connected to a sixth spring, and the bottom end of the sixth spring is fixedly connected to a fixed block (35) in contact with the limit ring (33).

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