An automated anti-fouling device for the convex surface of an optical probe lens.

Abstract

This invention discloses an automated anti-fouling device for the convex surface of an optical probe lens. The device includes an optical probe mounted on a robotic arm. The lower end of the optical probe is the exposed convex surface of the lens. A horizontally rotating servo motor is mounted on one side of the lower end of the optical probe via a servo motor support. A swing arm is vertically connected to the servo motor's shaft, and an anti-fouling cap is fixedly connected to the end of the swing arm. When the optical probe is in operation, the anti-fouling cap separates from the convex surface of the lens and is outside the detection range of the optical probe. After the rotating shaft rotates a predetermined angle, the anti-fouling cap swings with the swing arm to the coaxial center, covering the convex surface of the lens and actively preventing contamination. This device can safely clean and simultaneously dry the convex surface of the optical probe lens, ensuring measurement accuracy and long-term stable operation of the equipment.

Description

Technical Field

[0001] This invention belongs to the field of optical probes. Background Technology

[0002] Optical probes are key components in precision measurement and testing equipment, such as spectrometer probes, vision probes, and CCD camera lenses. Their convex surfaces are directly exposed to the working environment and are easily contaminated with dust, oil, water stains, and other pollutants. These pollutants can seriously affect the accuracy and stability of optical measurements and even lead to distortion of measurement data.

[0003] Traditional cleaning methods primarily rely on manual, timed wiping. This approach is not only inefficient and ill-suited to the high-speed, continuous operation demands of automated production lines, but also prone to uneven wiping pressure and inconsistent techniques, easily leaving scratches or causing localized damage to the convex surfaces of lenses. Furthermore, residual cleaning fluid or fibers can easily re-contaminate the lens. Existing automated cleaning devices often employ simple brushing or blowing methods, which are ineffective at removing stubborn stains. They also lack adaptability to the curvature of convex lenses, making it difficult to achieve uniform coverage and thorough cleaning. Moreover, they lack rapid drying capabilities after cleaning, and residual liquid may form water stains that affect subsequent measurements.

[0004] Therefore, a device is needed that can safely clean and simultaneously dry the convex surface of the optical probe lens to ensure measurement accuracy and long-term stable operation of the equipment. Summary of the Invention

[0005] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides an automated anti-fouling device for the convex surface of an optical probe lens, which can safely clean and simultaneously dry the convex surface of the optical probe lens to ensure measurement accuracy and long-term stable operation of the equipment.

[0006] Technical solution: To achieve the above objectives, the present invention provides an automated anti-fouling device for the convex surface of an optical probe lens, comprising an optical probe mounted on a robotic arm; the lower end of the optical probe is an exposed convex arc surface of the lens; a servo motor with a horizontal rotating shaft is mounted on one side of the lower end of the optical probe via a servo motor support, a swing arm is vertically connected to the rotating shaft of the servo motor, and an anti-fouling cap is fixedly connected to the end of the swing arm.

[0007] When the optical probe is in operation, the anti-fouling cap separates from the convex surface of the lens and is outside the detection range of the optical probe. After the rotating shaft rotates by a predetermined angle, the anti-fouling cap swings with the swing arm to cover the convex surface of the lens on the coaxial center and can actively resist the fouling of the covered convex surface of the lens.

[0008] Furthermore, the anti-fouling cap includes a coaxial annular wall and a concave rotating cover, with the end of the swing arm fixedly connected to the outer wall of the annular wall; the concave surface of the concave rotating cover is adapted to the convex arc surface of the lens.

[0009] The concave rotating cover can rotate actively relative to the ring wall coaxially; the concave surface of the concave rotating cover is fixedly provided with several cleaning sponge strips distributed radially.

[0010] Furthermore, when the anti-fouling cap swings with the swing arm to cover the convex surface of the lens coaxially, each cleaning sponge strip on each concave rotating cover makes uniform contact with the convex surface of the lens along the radial arc path.

[0011] Furthermore, the inner ring of the ring wall is coaxially fixed with a bearing sleeve by several radially extending structural arms, and the inner ring of the bearing sleeve is provided with a central rotating column through the rotation of the bearing.

[0012] With the concave surface of the rotating concave shield facing upwards:

[0013] A turntable is coaxially fixed to the upper end of the central rotating column, and a hexagonal column is coaxially fixed to the upper end of the turntable. An inner hexagonal synchronous sleeve is fitted around the outer side of the hexagonal column, and the inner hexagonal synchronous sleeve contains an inner hexagonal chamber whose inner wall slides against the outer wall of the hexagonal column. The upper end of the inner hexagonal synchronous sleeve is coaxially and integrally connected to the lower end of the concave rotating cover. A cleaning fluid overflow hole is hollowed out at the axis of the concave rotating cover. The lower end of the cleaning fluid overflow hole is connected to the inner hexagonal chamber, and the upper end is connected to the common connection point of several cleaning sponge strips. An annular platform is coaxially set around the outer side of the inner hexagonal synchronous sleeve, and the annular platform is synchronously and fixedly connected to the turntable through a synchronous arm.

[0014] A number of centrifugal ball constraint grooves extending radially are arranged in a circular array on the upper side of the annular platform. The ends of the centrifugal ball constraint grooves, near and far from the axis of the annular platform, are respectively a proximal plate and a distal plate. Centrifugal balls and thrust springs are constrained in the centrifugal ball constraint grooves. The centrifugal balls are limited to be in contact with the proximal plate by the thrust of the thrust spring. A centrifugal ball stroke control rod extending along the axis of the thrust spring is arranged on the side of the distal plate near the centrifugal balls. In the initial state, the end of the centrifugal ball stroke control rod maintains a distance from the centrifugal balls. A tension spring is coaxially sleeved on the outside of the hexagonal synchronous sleeve. The upper and lower ends of the tension spring are respectively fixedly connected to the lower end of the concave rotating cover and the turntable. The tension spring applies a downward pulling force to the concave rotating cover. Under the pulling force of the tension spring, the convex arc surface of the lower end of the concave rotating cover is tangent to the number of centrifugal balls distributed in a circular array.

[0015] Furthermore, the concave rotating cover has several centrifugal air inlets arranged in a circular array near the geometric center, with each centrifugal air inlet located between the roots of two adjacent cleaning sponge strips.

[0016] When the anti-fouling cap swings with the swing arm to cover the convex surface of the lens on the coaxial center, a centrifugal air channel in the shape of a fan is formed between any two adjacent cleaning sponge strips from a top view. Each centrifugal air channel is connected to the centrifugal air inlet near the geometric center of the concave rotating cover.

[0017] Furthermore, the integrated structure formed by the central rotating column and the internal hexagonal synchronous sleeve has a coaxially continuous liquid guiding channel; it also includes a cleaning fluid supply pipe fixed on the ring wall, and the cleaning fluid outlet end of the cleaning fluid supply pipe is connected to the lower end of the liquid guiding channel through a rotary joint.

[0018] Furthermore, a gear is coaxially fixed at the lower end of the central rotating column, and a motor is mounted on the structural arm via a motor bracket. The output end of the motor is connected to a drive gear, which meshes with the gear.

[0019] Furthermore, a working method of an automated anti-fouling device for the convex surface of an optical probe lens: when the optical probe is in working condition, the anti-fouling cap is separated from the convex surface of the lens, and the anti-fouling cap is outside the detection range of the optical probe, while the concave surface of the concave rotating cover is in a downward state.

[0020] The automated process of removing contaminants from the exposed convex surface of the lens at the lower end of the optical probe is as follows:

[0021] Step 1: With the concave surface of the concave rotating cover facing downwards, the cleaning fluid supply pipe introduces the cleaning fluid into the internal hexagonal chamber through the liquid guide channel. At the same time, the motor drives the central rotating column to rotate at high speed through the drive gear. Then, the motor is stopped, the cleaning fluid supply pipe stops supplying and returns to the initial state.

[0022] Step 2: The servo motor controls the rotating shaft to rotate 180° counterclockwise, and the anti-fouling cap swings with the swing arm to cover the convex surface of the lens at the coaxial center.

[0023] Step 3: The motor drives the central rotating column to rotate at a low speed through the drive gear;

[0024] Step four: Increase the motor speed to switch the concave rotating cover and the annular platform to synchronous high-speed rotation; after a predetermined time, the servo motor controls the rotating shaft to rotate 180° clockwise, so that the anti-fouling cap is completely separated from the convex surface of the lens, the anti-fouling cap moves outside the optical scanning range of the optical probe, and returns to its initial position; then the motor is paused; thus, the optical probe quickly returns to the working state.

[0025] Beneficial effects: This invention uses a servo-driven swing arm to precisely swing the anti-fouling cap, achieving automatic docking and separation between the cap and the convex surface of the lens.

[0026] The anti-fouling cap has an active rotating concave cover with radially distributed cleaning sponge strips fixed on its concave surface. When the cap covers the lens, the sponge strips make even contact with the convex surface radially.

[0027] The internal transmission mechanism uses a motor to drive a central rotating column via gears, and transmits torque to the concave rotating cover through the sliding engagement of a hexagonal column and an internal hexagonal synchronous sleeve. Simultaneously, a tension spring keeps the concave rotating cover in a downward trend. A circular array of centrifugal ball constraint grooves is arranged on the annular platform, housing centrifugal balls and thrust springs. During low-speed rotation, the centrifugal balls are restrained by the springs, supporting the concave rotating cover and ensuring the sponge strip remains in close contact with the lens for wiping. During high-speed rotation, centrifugal force overcomes the springs, causing the centrifugal balls to move outwards, and the concave rotating cover falls, creating a tiny gap to prevent high-speed friction damage.

[0028] A centrifugal air inlet is provided on the concave rotating cover, naturally forming a centrifugal airflow channel between adjacent sponge strips. During high-speed rotation, a forced airflow is generated, quickly ejecting cleaning fluid and contaminants from the lens surface and sponge strips, allowing them to evaporate and dry. The cleaning fluid supply pipe connects to a liquid guide channel via a rotary joint, precisely delivering the cleaning fluid to the base of the sponge strip, where it rapidly soaks the entire strip under centrifugal force. The entire workflow automatically completes soaking, wiping, gap separation, centrifugal drying, and resetting, ensuring not only uniform and safe cleaning but also rapid drying after cleaning, preventing residual liquid from affecting subsequent measurements and significantly improving the environmental adaptability and measurement reliability of the optical probe. Attached Figure Description

[0029] Figure 1 This is a schematic diagram showing the working state and the active anti-fouling state;

[0030] Figure 2 for Figure 1 A three-dimensional diagram showing the two states;

[0031] Figure 3 A partial cross-sectional view of the anti-fouling cap in a clean state;

[0032] Figure 4 for Figure 3 A sectional view;

[0033] Figure 5 Disassembly diagram of the anti-fouling cap. Detailed Implementation

[0034] The invention will now be further described with reference to the accompanying drawings.

[0035] like Figures 1 to 5 The diagram illustrates an automated anti-fouling device for the convex surface of an optical probe lens. The optical probe 8 is mounted on a robotic arm. The lower end of the optical probe 8 is an exposed convex surface 9 of the lens. This convex surface 9 is a critical part of the optical inspection process and is easily contaminated with dust, oil, etc., the cleanliness of which directly affects measurement accuracy. A horizontally rotating servo motor 4 with a servo motor support 2 is mounted on one side of the lower end of the optical probe 8. A swing arm 5 is vertically connected to the rotating shaft 3 of the servo motor 4, and an anti-fouling cap 1 is fixedly connected to the end of the swing arm 5.

[0036] When the optical probe 8 is in operation, the anti-fouling cap 1 is separated from the lens convex surface 9, and the anti-fouling cap 1 is outside the detection range of the optical probe 8. After the rotating shaft 3 rotates at a predetermined angle, the anti-fouling cap 1 swings with the swing arm 5 to the coaxial center to cover the lens convex surface 9, and can actively resist the fouling of the covered lens convex surface 9.

[0037] The anti-fouling cap 1 includes a coaxial annular wall 7 and a concave rotating cover 6, with the end of the swing arm 5 fixedly connected to the outer wall of the annular wall 7; the concave surface of the concave rotating cover 6 is adapted to the convex arc surface 9 of the lens. The concave shape of the concave rotating cover 6 matches the convex arc surface 9 of the lens, ensuring that the cleaning element can make uniform contact with the lens surface.

[0038] The concave rotating cover 6 can rotate actively relative to the annular wall 7 on the same axis; the concave surface of the concave rotating cover 6 is fixedly provided with a number of cleaning sponge strips 11 arranged radially. The cleaning sponge strips 11 are made of flexible material, which can absorb cleaning liquid and gently scrape off stains, and the radial distribution ensures that the lens surface is fully covered when rotating.

[0039] When the anti-fouling cap 1 swings with the swing arm 5 to cover the convex surface 9 of the lens coaxially, each cleaning sponge strip 11 on each concave rotating cover 6 makes uniform contact with the convex surface 9 of the lens along the radial arc path. This uniform contact design avoids damage to the lens due to excessive local pressure, while ensuring thorough cleaning without any blind spots.

[0040] The inner ring of the ring wall 7 is coaxially fixed with a bearing sleeve 28 through several radially extending structural arms 13. The inner ring of the bearing sleeve 28 is rotatably provided with a central rotating column 26 through a bearing 27. The lower end of the central rotating column 26 is coaxially fixed with a gear 25. A motor 29 is installed on the structural arm 13 through a motor bracket 30. The output end of the motor 29 is driven by a drive gear 31, which meshes with the gear 25.

[0041] With the concave surface of the concave rotating cover 6 facing upwards:

[0042] A turntable 24 is coaxially fixed to the upper end of the central rotating column 26, and a hexagonal column 23 is coaxially fixed to the upper end of the turntable 24. An inner hexagonal synchronous sleeve 22 is slidably sleeved on the outside of the hexagonal column 23. Inside the inner hexagonal synchronous sleeve 22 is an inner hexagonal chamber 21 whose inner wall slides with the outer wall of the hexagonal column 23. The cooperation between the hexagonal column 23 and the inner hexagonal chamber 21 not only transmits torque, but also allows the inner hexagonal synchronous sleeve 22 to slide axially, thereby realizing the axial displacement of the concave rotating cover 6.

[0043] The upper end of the internal hexagonal synchronous sleeve 22 is coaxially and integrally connected to the lower end of the concave rotating cover 6; the concave rotating cover 6 has a cleaning fluid overflow hole 19 hollowed out at the axis, the lower end of the cleaning fluid overflow hole 19 is connected to the internal hexagonal compartment 21, and the upper end is connected to the common connection point of several cleaning sponge strips 11; the cleaning fluid overflow hole 19 serves as a cleaning fluid delivery channel to ensure that the cleaning fluid can accurately reach the root of the sponge strip.

[0044] An annular platform 16 is coaxially arranged on the outer side of the internal hexagonal synchronous sleeve 22. The annular platform 16 is synchronously and fixedly connected to the turntable 24 through the synchronous arm 14. The synchronous arm 14 enables the annular platform 16 and the turntable 24 to rotate synchronously, ensuring the rotation consistency between the centrifugal mechanism and the rotating cover.

[0045] The upper side of the annular platform 16 is provided with a plurality of centrifugal ball constraint grooves 17 extending radially in a circular array. The centrifugal ball constraint grooves 17 are located at the proximal plate 15 and the distal plate 18, respectively, near and away from the axis of the annular platform 16. Centrifugal balls 33 and thrust springs 34 are constrained in the centrifugal ball constraint grooves 17. The centrifugal balls 33 are positioned close to the proximal plate 15 under the thrust of the thrust springs 34. The thrust springs 34 provide an initial preload force to keep the centrifugal balls 33 close to the axis at low speeds.

[0046] A centrifugal ball stroke control rod 35 extending along the axis of the thrust spring 34 is provided on the side of the distal plate 18 near the centrifugal ball 33. In the initial state, the end of the centrifugal ball stroke control rod 35 maintains a distance from the centrifugal ball 33. The stroke control rod 35 limits the maximum displacement of the centrifugal ball to prevent it from dislodging from the constraint groove.

[0047] A tension spring 32 is coaxially fitted around the hexagonal synchronous sleeve 22. The upper and lower ends of the tension spring 32 are fixedly connected to the lower end of the concave rotating cover 6 and the turntable 24, respectively. The tension spring 32 applies a downward pulling force to the concave rotating cover 6. Under the pulling force of the tension spring 32, the convex arc surface of the lower end of the concave rotating cover 6 is tangent to several centrifugal balls 33 arranged in a circular array. The tension spring 32 ensures that the concave rotating cover 6 always has a downward tendency and maintains contact with the centrifugal balls 33. Thus, at low speeds, the centrifugal balls support and position the cover, and at high speeds, the outward movement of the centrifugal balls causes the cover to fall, thereby achieving gap adjustment.

[0048] The concave rotating cover 6 has a circular array of centrifugal air inlets 12 near its geometric center. Each centrifugal air inlet 12 is located between the roots of two adjacent cleaning sponge strips 11, providing an entrance for air into the air duct. When the anti-fouling cap 1 swings with the swing arm 5 to cover the convex surface 9 of the lens coaxially, a fan-shaped centrifugal air duct is formed between any two adjacent cleaning sponge strips 11 from a top-down perspective. Each centrifugal air duct connects to the centrifugal air inlets 12 near the geometric center of the concave rotating cover 6. When the concave rotating cover 6 rotates at high speed, the air in the air duct is thrown out by centrifugal force, forming a forced airflow that accelerates drying and decontamination.

[0049] The integrated structure formed by the central rotating column 26 and the internal hexagonal synchronous sleeve 22 has a coaxially continuous liquid guiding channel 20; it also includes a cleaning fluid supply pipe 10 fixed on the annular wall 7, and the cleaning fluid outlet end of the cleaning fluid supply pipe 10 is connected to the lower end of the liquid guiding channel 20 through a rotary joint 38. The rotary joint 38 ensures that the cleaning fluid can be continuously supplied even when rotating, avoiding pipe entanglement.

[0050] Working principle:

[0051] When the optical probe 8 is in operation, the anti-fouling cap 1 is separated from the convex surface 9 of the lens, and the anti-fouling cap 1 is outside the detection range of the optical probe 8. The concave surface of the concave rotating cover 6 is facing downwards. Figure 1 As shown in the figure above, the anti-fouling cap 1 is outside the optical scanning range of the optical probe 8. This standby position avoids interference with optical detection, while the concave surface facing down prevents dust from accumulating inside the concave surface.

[0052] After the optical probe 8 has been running automatically for a predetermined period of time, this structure will automatically perform an automatic anti-fouling process on the exposed lens convex surface 9 at the lower end of the optical probe 8. The process of performing an automatic anti-fouling process is as follows:

[0053] Step 1: With the concave surface of the concave rotating cover 6 facing downwards, the cleaning fluid supply pipe 10 introduces the cleaning fluid into the inner hexagonal chamber 21 through the liquid guiding channel 20. Then, the cleaning fluid in the inner hexagonal chamber 21 overflows continuously through the cleaning fluid overflow hole 19 under the action of gravity and hydraulic pressure to the common connection point of several cleaning sponge strips 11, and is absorbed by the end of each cleaning sponge strip 11 near the axis of the concave rotating cover 6.

[0054] Simultaneously, motor 29 drives the central rotating column 26 to rotate at high speed via drive gear 31, thereby causing the concave rotating cover 6 and the annular platform 16 to rotate synchronously. The cleaning liquid continuously absorbed by the end of each cleaning sponge strip 11 near the axis of the concave rotating cover 6 is accelerated and diffused away from the annular platform 16 along the length of each cleaning sponge strip 11 under the action of centrifugal force, so that each cleaning sponge strip 11 is quickly and completely soaked in cleaning liquid under the drive of centrifugal force; the centrifugal force generated by high-speed rotation forces the cleaning liquid to quickly penetrate to the end of the sponge strip, ensuring that the entire sponge is evenly wetted, preparing for subsequent cleaning. Then, motor 29 is stopped, the concave rotating cover 6 and the annular platform 16 stop rotating, the cleaning liquid supply pipe 10 stops supplying and returns to the initial state.

[0055] Step two, the servo motor 4 controls the rotating shaft 3 to rotate 180° counterclockwise. The anti-fouling cap 1 swings with the swing arm 5 to cover the convex arc surface 9 of the lens coaxially. The concave surface of the concave rotating cover 6 changes from facing upward to facing downward. The cleaning sponge strips 11 on each concave rotating cover 6, which are soaked in cleaning fluid, evenly contact the convex arc surface 9 of the lens along the radial arc path. At this time, if... Figure 1 As shown in the image below; a 180° rotation moves the wet sponge strip from the standby position to the working position, bringing it into contact with the lens surface.

[0056] Step 3: Motor 29 drives the central rotating column 26 to rotate at low speed through drive gear 31, thereby causing the concave rotating cover 6 and the annular platform 16 to rotate synchronously at low speed. At this time, the centrifugal force on each centrifugal ball 33 is insufficient to overcome each thrust spring 34. Each cleaning sponge strip 11, which is soaked in cleaning fluid, slowly rotates to scrape away the dirt and attachments on the convex arc surface 9 of the lens. Since each cleaning sponge strip 11 is soaked in cleaning fluid, the problem of scratching the convex arc surface 9 of the lens is prevented during the cleaning process. When rotating at low speed, the centrifugal balls remain retracted, the position of the concave rotating cover 6 remains unchanged, and the sponge strips are in close contact with the lens. The dirt is removed by rotational friction, and the cleaning fluid plays a lubricating and dissolving role.

[0057] Step four: Increase the speed of motor 29 to switch the concave rotating cover 6 and the annular platform 16 to synchronous high-speed rotation. At this time, the centrifugal force on each centrifugal ball 33 is sufficient to overcome each thrust spring 34, thus causing each centrifugal ball 33 to move centrifugally under the action of centrifugal force, until each centrifugal ball 33 moves to the limit contact with each centrifugal ball stroke control rod 35, thereby causing each centrifugal ball 33 to detach from the convex arc surface of the concave rotating cover 6. After the concave rotating cover 6 loses the support of each centrifugal ball 33, it will move downward relative to the annular platform 16 under the tension of the tension spring 32. A certain distance is maintained until the convex arc surface of the concave rotating cover 6 re-contacts each centrifugal ball 33. At this time, because the concave rotating cover 6 has moved downward by a certain distance, the original contact between each cleaning sponge strip 11 and the convex arc surface 9 of the lens changes to a gap of about 1mm. This avoids friction between the high-speed rotating cleaning sponge strip 11 and the convex arc surface 9 of the lens, thus avoiding the problems of rotational resistance and high-speed scratches. During high-speed rotation, the centrifugal force causes the centrifugal balls to move outward, resulting in the concave rotating cover moving downward and the sponge strips separating from the lens, preventing high-speed friction damage to the lens. At the same time, the gap generated is conducive to airflow.

[0058] Simultaneously, the high-speed rotating cleaning sponge strips 11 generate centrifugal force in the fan-shaped centrifugal airflow channels formed between any two adjacent cleaning sponge strips 11. Driven by this centrifugal force, the air in these channels is continuously flung outwards. At the same time, each centrifugal air inlet 12 continuously replenishes the fan-shaped centrifugal airflow channels between any two adjacent cleaning sponge strips 11 with external air, thus creating a continuous centrifugal airflow within these channels. The cleaning liquid and particulate impurities adhering to the lens convex surface 9 and each cleaning sponge strip 11 are rapidly evaporated and centrifugally flung outwards by the centrifugal airflow within these channels, thereby quickly cleaning and drying the lens convex surface 9. This centrifugal airflow design utilizes the forced airflow generated by high-speed rotation, which not only accelerates the evaporation of the cleaning liquid but also blows loosened dirt particles away from the lens surface, achieving drying and secondary cleaning.

[0059] After the above process continues for a predetermined time, the servo motor 4 controls the rotating shaft 3 to rotate 180° clockwise, completely separating the anti-fouling cap 1 from the convex surface 9 of the lens. The anti-fouling cap 1 moves outside the optical scanning range of the optical probe 8 and returns to its initial position; then the motor 29 is paused; thus, the optical probe 8 quickly returns to its working state. The entire process is completed automatically without manual intervention, ensuring the continuous working capability and measurement accuracy of the optical probe.

[0060] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An automated anti-contamination device for a lens convex surface of an optical probe, characterized by: The application relates to an anti-pollution cap for an optical measuring head. In the working state of the optical measuring head (8), the anti-pollution cap (1) is separated from the lens convex arc surface (9) and is located outside the detection range of the optical measuring head (8); after the rotating shaft (3) is rotated by a predetermined angle, the anti-pollution cap (1) is swung to the coaxial center to cover the lens convex arc surface (9) along with the swing arm (5) and can actively prevent pollution of the covered lens convex arc surface (9).

2. An optical probe lens convex surface anti-fouling device according to claim 1, characterized in that: The anti-pollution cap (1) comprises a coaxial ring wall (7) and a concave rotary cover (6), and the swing arm (5) is fixedly connected with the outer wall of the ring wall (7); the concave surface of the concave rotary cover (6) is adapted to the lens convex arc surface (9). The concave rotary cover (6) can be actively rotated relative to the coaxial ring wall (7); and the concave surface of the concave rotary cover (6) is fixedly provided with a plurality of cleaning sponge strips (11) which are distributed in a radial manner.

3. An optical probe lens convex surface anti-fouling device according to claim 2, wherein: When the anti-pollution cap (1) is swung to the coaxial center to cover the lens convex arc surface (9) along with the swing arm (5), the cleaning sponge strips (11) on the concave rotary cover (6) are uniformly contacted with the lens convex arc surface (9) along the arc path in the radial direction.

4. An optical probe lens convex surface anti-fouling device according to claim 3, characterized in that: The inner ring of the ring wall (7) is coaxially fixed with a bearing sleeve (28) through a plurality of radially-extending structural arms (13), and the bearing sleeve (28) is rotatably provided with a central rotating column (26) through a bearing (27). In the posture that the concave surface of the concave rotary cover (6) faces upwards: The upper end of the central rotating column (26) is coaxially fixed with a rotating disc (24), and the upper end of the rotating disc (24) is coaxially fixed with a hexagonal column (23); the hexagonal column (23) is slidably sleeved with an internal hexagonal synchronous sleeve (22), the internal hexagonal synchronous sleeve (22) is internally provided with an internal hexagonal cavity (21) which is in sliding fit with the outer wall of the hexagonal column (23); the upper end of the internal hexagonal synchronous sleeve (22) is integrally connected with the lower end of the concave rotary cover (6) in a coaxial manner; the central axis of the concave rotary cover (6) is hollowed to form a cleaning liquid overflow hole (19), the lower end of the cleaning liquid overflow hole (19) is communicated with the internal hexagonal cavity (21), and the upper end of the cleaning liquid overflow hole (19) is communicated with the common connection position of the cleaning sponge strips (11); the external coaxial ring of the internal hexagonal synchronous sleeve (22) is provided with a ring-shaped platform (16), and the ring-shaped platform (16) is synchronously fixedly connected with the rotating disc (24) through a synchronous arm (14). A number of centrifugal ball constraint grooves (17) extending radially are arranged in a circular array on the upper side of the annular platform (16). The centrifugal ball constraint grooves (17) are near the axis of the annular platform (16) and far from the axis of the annular platform (16) respectively, with a proximal plate (15) and a distal plate (18). Centrifugal balls (33) and thrust springs (34) are constrained in the centrifugal ball constraint grooves (17). The centrifugal balls (33) are limited to the proximal plate (15) by the thrust of the thrust springs (34). A centrifugal ball stroke control rod (35) extending along the axis of the thrust springs (34) is arranged on the side of the distal plate (18) near the centrifugal balls (33). In the initial state, the end of the centrifugal ball stroke control rod (35) is kept at a distance from the centrifugal balls (33). The inner hexagonal synchronous sleeve (22) is coaxially fitted with a tension spring (32). The upper and lower ends of the tension spring (32) are fixedly connected to the lower end of the concave rotating cover (6) and the turntable (24), respectively. The tension spring (32) applies a downward pulling force to the concave rotating cover (6). Under the pulling force of the tension spring (32), the convex arc surface of the lower end of the concave rotating cover (6) is tangent to several centrifugal balls (33) arranged in a circular array.

5. An optical probe lens convex surface anti-fouling device according to claim 4, wherein: The concave rotating cover (6) has a circular array of hollowed-out centrifugal air inlets (12) near the geometric center. Each centrifugal air inlet (12) is located between the roots of two adjacent cleaning sponge strips (11). When the anti-fouling cap (1) swings with the swing arm (5) to cover the convex arc surface (9) of the lens on the same axis, a centrifugal air channel in the shape of a fan is formed between any two adjacent cleaning sponge strips (11) from a top view. Each centrifugal air channel is connected to the centrifugal air inlet (12) near the geometric center of the concave rotating cover (6).

6. An optical probe lens convex surface anti-fouling device according to claim 5, wherein: The integrated structure formed by the central rotating column (26) and the internal hexagonal synchronous sleeve (22) has a liquid guiding channel (20) coaxially connected; it also includes a cleaning liquid supply pipe (10) fixed on the ring wall (7), and the cleaning liquid outlet end of the cleaning liquid supply pipe (10) is connected to the lower end of the liquid guiding channel (20) through a rotary joint (38).

7. An optical probe lens convex surface anti-fouling device according to claim 6, wherein: The lower end of the central rotating column (26) is coaxially fixed with a gear (25), and a motor (29) is mounted on the structural arm (13) via a motor bracket (30). The output end of the motor (29) is connected to a drive gear (31), and the drive gear (31) meshes with the gear (25).

8. The working method of the automatic anti-fouling device for the convex surface of the lens of the optical measuring head according to claim 7, characterized in that: When the optical probe (8) is in working condition, the anti-fouling cap (1) is separated from the lens convex arc surface (9), and the anti-fouling cap (1) is outside the detection range of the optical probe (8), and the concave surface of the concave rotating cover (6) is in a downward state. The automatic anti-fouling process for the lens convex surface (9) exposed at the lower end of the optical probe (8) is as follows: Step 1: With the concave surface of the concave rotating cover (6) facing downwards, the cleaning fluid supply pipe (10) introduces the cleaning fluid into the inner hexagonal chamber (21) through the liquid guide channel (20). At the same time, the motor (29) drives the central rotating column (26) to rotate at high speed through the drive gear (31). Then, the motor (29) is stopped, the cleaning fluid supply pipe (10) stops supplying and returns to the initial state. Step 2: The servo motor (4) controls the rotating shaft (3) to rotate 180° counterclockwise, and the anti-fouling cap (1) swings with the swing arm (5) to cover the convex arc surface (9) of the lens. Step 3: The motor (29) drives the central rotating column (26) to rotate at low speed through the drive gear (31); Step 4: Increase the speed of the motor (29) to switch the concave rotating cover (6) and the annular platform (16) to a synchronous high-speed rotation state; After a predetermined time, the servo motor (4) controls the rotating shaft (3) to rotate 180° clockwise, so that the anti-fouling cap (1) is completely separated from the lens convex surface (9), the anti-fouling cap (1) moves to outside the optical scanning range of the optical probe (8), and returns to the initial position; The motor (29) is then paused, thus allowing the optical probe (8) to quickly return to its working state.

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