Photocatalysis-assisted spray polishing head

Abstract

The invention discloses a photocatalysis-assisted spray polishing head which comprises a center shaft used for conveying polishing spray and providing torque, a gas-liquid coaxial conveying assembly used for spray coaxial conversion, an electric slip ring used for being connected with an ultraviolet light source and a polishing disc assembly used for polishing a workpiece, and the gas-liquid coaxial conveying assembly is positioned and installed through a shaft shoulder on the center shaft. The polishing disc assembly is connected with the center shaft through a diaphragm coupling, and the polishing disc is connected with a flow channel of the center shaft in a sealed mode through a hose. The photocatalytic auxiliary polishing head with the bottom spraying function can achieve efficient photocatalytic oxidation on a workpiece in the polishing process, so that the polishing quality and efficiency are improved, and meanwhile, the pressure of the polishing disc is adjusted and controlled through bottom spraying, so that materials are evenly removed.

Description

Technical Field

[0001] The invention belongs to the technical field of ultra-precision polishing and relates to a photocatalytically assisted spray polishing head. Background Art

[0002] For large-scale optical components such as space telescopes, reaction-sintered silicon carbide is a high-quality material that meets the performance requirements of its service. However, due to its high hardness, strong chemical stability, and two-phase material characteristics, its polishing efficiency is low and polishing is difficult. Therefore, achieving high-quality and efficient processing and obtaining an optical surface that meets the optical performance requirements is crucial to expanding the application of reaction-sintered silicon carbide in optical components. Traditional chemical mechanical polishing using nanoparticles of materials such as cerium dioxide and silicon dioxide has weak chemical effects and low polishing efficiency. Photocatalysis uses ultraviolet light to irradiate titanium dioxide photocatalysts to form an efficient oxidation environment, but how to integrate it with a polishing head to achieve an efficient polishing effect is a difficult problem.

[0003] Small grinding head polishing is a widely used method in computer-controlled optical surface forming. Surface polishing is completed by controlling the motion parameters of the grinding head. Due to the difference in speed of each point on the polishing disk during the operation of the small grinding head, the material removal distribution is often uneven, which increases the difficulty of computer control. In order to reduce the difficulty of computer control and improve polishing efficiency, it is necessary to enable the polishing head to obtain uniformly distributed material removal. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the object of the present invention is to provide a photocatalytically assisted spray polishing head which realizes efficient polishing and bottom spraying to obtain uniform material removal through photocatalytic assistance.

[0005] The technical means adopted by the present invention are as follows:

[0006] A photocatalytically assisted spray polishing head comprises a central axis, a gas-liquid coaxial transport component, an electric slip ring and a polishing disc component.

[0007] The central shaft is a rotary stepped shaft structure, with two upper and lower step positioning surfaces in the middle part, a radial through hole in the middle of the step positioning surface, and an inner hole flow channel is left axially below the through hole; the step positioning surface is used to position and install the gas-liquid coaxial transport component, and the through hole position is aligned with the axial direction of the spray interface; a retaining spring groove is opened in the middle section of the central shaft, and a retaining spring is installed in the retaining spring groove, and the retaining spring plays a limiting role on the gas-liquid coaxial transport component; a hose installation groove is provided at the bottom of the central shaft, and a hose is installed in the hose installation groove, and the groove depth is the same as the hose wall thickness, and the hose can seal the flow channel in the groove.

[0008] The gas-liquid coaxial transport component is used to realize the coaxial transport of the polishing spray during the rotation of the polishing head, and includes a main shell, an upper bearing, a lower bearing, a rotary seal, a spray interface, a limit screw and an electric slip ring limiter. The main shell is cylindrical in shape, with a through hole in the center axially opening to match the central axis clearance, a threaded mounting hole connected to the through hole opening at the center of the side, and limit threaded mounting blind holes on both sides of the shell at a 90° angle to the threaded mounting hole. The threaded mounting hole is used to install the spray interface to realize the transport of the polishing spray from the outside to the inside of the gas-liquid coaxial transport component, and the threaded mounting blind hole is used to install the limit screw to ensure that the main shell does not rotate during the rotary operation of the polishing head. The limit screw is covered with an electric slip ring limiter, so that the electric slip ring remains relatively still with the main shell during the rotary operation of the polishing head. The main body shell is provided with a bearing mounting position and an annular mounting groove at upper and lower symmetrical positions. The bearing mounting position is used to install the upper bearing and the lower bearing. The annular mounting groove is installed with a rotary seal to ensure the stable operation of the gas-liquid coaxial transport component and the flow channel sealing when the polishing head rotates.

[0009] The polishing disc assembly includes a polishing disc body, a coupling, an ultraviolet lamp bead, and a consolidated abrasive polishing pad. The polishing disc body contains four L-shaped flow channels and is centrally symmetrically distributed. Each flow channel has three pressure outlets downwardly opened. The distribution position of the pressure outlets corresponds to the gap between the grinding units of the consolidated abrasive polishing pad attached to the bottom of the polishing disc. The polishing liquid can be sprayed evenly on the surface of the workpiece through the pressure outlets. The polishing disc body is provided with four centrally symmetrical mounting grooves in the L-shaped flow channel interval part. No less than one ultraviolet lamp bead is installed in each of the mounting grooves. The positive and negative wires of the ultraviolet lamp bead are connected to an external power supply through an electric slip ring. The upper end of the polishing disc body is a hollow cylindrical section, which is equipped with a coupling, and is connected to the end section of the central shaft and its inner flow channel through the coupling.

[0010] Preferably, the central shaft is made of stainless steel; a connecting section for docking with a machine tool is provided at the top of the central shaft; the central shaft has two or three through holes at the spray interface position corresponding to the gas-liquid coaxial transport component, and the through holes are evenly distributed along the circumference of the central shaft.

[0011] Preferably, the shell of the gas-liquid coaxial transport component is made of stainless steel; the spray interface is installed in the middle position of the shell through a threaded connection; the limit screw is symmetrically installed in the threaded hole on the shell at a position 90° circumferentially with the spray interface; bearings and rotary seals are symmetrically installed in the shell of the gas-liquid coaxial transport component; the upper bearing and the lower bearing are ceramic bearings; the rotary seal is a rotating combined sealing ring or a pressure-resistant skeleton oil seal.

[0012] Preferably, the electric slip ring is a 6-way 2A slip ring.

[0013] Preferably, the coupling is a diaphragm coupling.

[0014] Preferably, the polishing disc body is integrally formed by 3D printing or casting; the bottom of the polishing disc body is evenly distributed with spray outlets in a cross shape; the ultraviolet lamp beads are 3 or 4 evenly embedded and installed inside the polishing disc body; after the ultraviolet lamp beads are installed, they are sealed with insulating thermal conductive glue; the polishing pad is a consolidated abrasive polishing pad; the abrasive material of the consolidated abrasive polishing pad is diamond.

[0015] Preferably, the polishing liquid is a nano titanium dioxide dispersion with a concentration range of 0.5% to 2%; the polishing liquid spray is obtained by atomizing the polishing liquid with compressed air or oxygen; and the high-pressure polishing liquid spray pressure is 0.1 MPa to 1 MPa.

[0016] The beneficial effects of the present invention are:

[0017] 1. The present invention can form a local high-efficiency oxidation environment on the surface of the workpiece through photocatalysis, thereby improving the polishing efficiency and quality of the polishing head.

[0018] 2. The high-pressure polishing liquid spray at the bottom of the polishing head can adjust the pressure distribution at the bottom of the polishing plate, so that the polishing head can obtain uniformly distributed material removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of a photocatalytically assisted spray polishing head of the present invention.

[0020] Figure 2 It is a schematic diagram of the central axis assembly of the present invention.

[0021] FIG. 3( a ) is a schematic diagram of the central axis of the present invention.

[0022] FIG3( b ) is a schematic diagram of a central axis cross section of the present invention.

[0023] FIG. 4( a ) is a schematic diagram of a gas-liquid coaxial transport assembly of the present invention.

[0024] FIG4( b ) is a schematic cross-sectional view of the gas-liquid coaxial transport assembly of the present invention.

[0025] FIG. 5( a ) is a top view of the main housing of the present invention.

[0026] FIG5( b ) is a cross-sectional view of the main body shell of the present invention.

[0027] FIG. 5( c ) is a perspective view of the main body shell of the present invention.

[0028] FIG. 6( a ) is a schematic diagram of a polishing disc assembly of the present invention.

[0029] FIG6( b ) is a cross-sectional view of the polishing disk assembly of the present invention.

[0030] FIG. 7( a ) is a schematic diagram of the polishing disc body of the present invention.

[0031] FIG. 7( b ) is a cross-sectional view of the polishing disk body AA of the present invention.

[0032] FIG. 7( c ) is a cross-sectional view of the polishing disc body BB of the present invention.

[0033] In the figure: 1. Central axis; 2. Gas-liquid coaxial transport assembly; 21. Limit screw; 22. Limit piece; 23. Housing; 24. Upper bearing; 25. Rotary seal; 26. Spray interface; 27. Lower bearing; 3. Electric slip ring; 4. Coupling; 5. Polishing disc assembly; 51. Polishing disc body; 52. UV lamp beads; 53. Polishing pad; 6. Retaining spring; 7. Hose. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0037] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be clear that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0038] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0039] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0040] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0041] Embodiment 1:

[0042] like Figure 1 As shown, the present invention discloses a photocatalytically assisted spray polishing head, comprising a central axis 1, on which a gas-liquid coaxial transport component 2, an electric slide 3, and a polishing disc component 5 are installed from top to bottom.

[0043] like Figure 2 As shown, the central shaft 1 is provided with a shoulder for determining the installation position of the gas-liquid coaxial transport component 2, and the liquid coaxial transport component 2 is fixed by a retaining spring 7; a through hole is opened on the central shaft 1, corresponding to the gas mist interface position of the gas-liquid coaxial transport component 2, so as to realize the coaxial delivery of the high-pressure polishing liquid spray; a hose 7 is installed at the end of the central shaft 1, which forms a closed flow channel for conveying the high-pressure polishing liquid spray after docking with the polishing disc assembly 5.

[0044] Specifically, the central shaft 1 is made of stainless steel, which can not only provide high mechanical strength, but also prevent rust in the polishing liquid environment, thereby ensuring the stability of the component.

[0045] As shown in Figures 3 and 4, the gas-liquid coaxial transport component 2 includes an outer part and an inner part with the outer shell 23 as the boundary; in the outer part, the limit screw 21 is fastened by the threads on both sides of the outer shell 23, the upper part of the limit member 22 is a threaded hole, which is installed on the limit screw 21, and its lower part is inserted into the reserved position of the electric slip ring 3, so that the electric slip ring and the outer shell 23 remain stationary when the central shaft 1 rotates; in the inner part, the spray interface 26 is installed through the threaded hole on the outer shell 23 to receive the high-pressure polishing liquid spray; the rotary seal 25 can ensure the sealing of the flow channel and the outside world during the rotation of the central shaft 1; the upper bearing 24 and the lower bearing 27 are installed at two sections of the outer shell 23, and their inner holes cooperate with the central shaft 1 to realize the positioning and installation of the gas-liquid coaxial transport component 2.

[0046] Specifically, the housing 23, the limit screw 21 and the limit member 22 are made of stainless steel, which ensures mechanical strength while having rust resistance; the upper bearing 24 and the lower bearing 27 are deep groove ball bearings made of ceramic material, which can withstand a certain axial load and have rust resistance; the rotary seal 25 can adopt a rotary seal ring or oil seal with pressure resistance, which can achieve low-friction rotary sealing under the condition of bearing the spray pressure of the polishing liquid.

[0047] As shown in Figure 5, the polishing disc body 51 has an internal flow channel and a cross-shaped high-pressure polishing liquid spray outlet at the bottom, which is sprayed onto the workpiece surface to form a pressure air film, thereby improving the material removal characteristics during the polishing process; the ultraviolet lamp bead 52 is embedded in the installation groove of the polishing disc body 51; the fixed abrasive polishing pad 53 is adhered to the bottom surface of the polishing disc body 51, and a hole is opened at the high-pressure polishing liquid spray outlet.

[0048] The coupling 4 used for installing the polishing disc assembly 5 is a diaphragm coupling, which can compensate for errors during the installation process and deformation caused by the load; the polishing disc body 51 is made of aluminum alloy and is 3D printed or integrally cast to ensure its structural strength while having corrosion resistance and high thermal conductivity, thereby improving the stability of the polishing process.

[0049] Embodiment 2:

[0050] A photocatalytically assisted spray polishing head comprises a central axis 1, a gas-liquid coaxial transport component 2, an electric slip ring 3, and a polishing disc component 5.

[0051] The central shaft 1 is a rotary stepped shaft structure, with two upper and lower step positioning surfaces in the middle part, a radial through hole in the middle of the step positioning surface, and an inner hole flow channel is left axially below the through hole; the step positioning surface is used to position and install the gas-liquid coaxial transport component, and the position of the through hole is axially aligned with the spray interface 26; a retaining spring groove is opened in the middle section of the central shaft 1, and a retaining spring 6 is installed in the retaining spring groove, and the retaining spring 6 plays a limiting role for the gas-liquid coaxial transport component 2; a hose installation groove is provided at the bottom of the central shaft 1, and a hose 7 is installed in the hose installation groove, and the groove depth is the same as the wall thickness of the hose 7, and the hose 7 can seal the flow channel in the groove.

[0052] The gas-liquid coaxial transport component 2 is used to realize the coaxial transport of the polishing spray during the rotation of the polishing head, and includes a main housing 23, an upper bearing 24, a lower bearing 27, a rotary seal 25, a spray interface 26, a limit screw 21 and an electric slip ring limiter 22. The main housing 23 is cylindrical in shape, with a through hole in the center axially opening to match the central axis 1, a threaded mounting hole connected to the through hole opening at the center of the side, and limit threaded mounting blind holes on both sides of the outer shell at a 90° angle to the threaded mounting hole. The threaded mounting holes are used to install the spray interface 26 to realize the transport of the polishing spray from the outside to the inside of the gas-liquid coaxial transport component, and the threaded mounting blind holes are used to install the limit screw 21 to realize that the main housing 23 will not rotate during the rotation of the polishing head. The limit screw 21 is sleeved with an electric slip ring limiter 22, so that the electric slip ring remains relatively still with the main housing 23 during the rotation of the polishing head. The main shell 23 is provided with bearing mounting positions and annular mounting grooves at upper and lower symmetrical positions. The bearing mounting positions are used to mount the upper bearing 24 and the lower bearing 27. The annular mounting groove is provided with a rotary seal 25 to ensure stable operation of the gas-liquid coaxial transport assembly and flow channel sealing when the polishing head rotates.

[0053] The polishing disc assembly 5 includes a polishing disc body 51, a coupling 4, an ultraviolet lamp bead 52, and a fixed abrasive polishing pad 53. The polishing disc body 51 contains four L-shaped flow channels and is centrally symmetrically distributed. Each flow channel has three pressure outlets downwardly opened. The distribution position of the pressure outlets corresponds to the grinding unit gap of the fixed abrasive polishing pad 53 attached to the bottom of the polishing disc. The polishing liquid spray can be evenly sprayed on the surface of the workpiece through the pressure outlets. The polishing disc body 51 is provided with four centrally symmetrical installation grooves in the L-shaped flow channel interval part. No less than one ultraviolet lamp bead 52 is installed in each of the installation grooves. The positive and negative wires of the ultraviolet lamp bead 52 are connected to the external power supply through the electric slip ring 3. The upper end of the polishing disc body 51 is a hollow cylindrical section, which is equipped with a coupling 4, and is connected to the end section of the central shaft 1 and its inner flow channel through the coupling 4.

[0054] The central shaft 1 is made of stainless steel; a connection section for docking with a machine tool is provided at the top of the central shaft 1; the central shaft 1 has two or three through holes at the spray interface position corresponding to the gas-liquid coaxial transport component 2, and the through holes are evenly distributed along the circumference of the central shaft.

[0055] The shell of the gas-liquid coaxial transport component 2 is made of stainless steel; the spray interface 26 is installed in the middle position of the shell through a threaded connection; the limit screw 21 is symmetrically installed in the threaded hole on the shell at a position 90° circumferentially with the spray interface 26; bearings and rotary seals 25 are symmetrically installed in the shell of the gas-liquid coaxial transport component 2; the upper bearing 24 and the lower bearing 27 are ceramic bearings; the rotary seal 25 is a rotating combined sealing ring or a pressure-resistant skeleton oil seal.

[0056] The electric slip ring 3 is a 6-way 2A slip ring.

[0057] The coupling 4 is a diaphragm coupling.

[0058] The polishing disc body 51 is formed by 3D printing or casting; the bottom of the polishing disc body is evenly distributed with spray outlets in a cross shape; the ultraviolet lamp beads 52 are 3 or 4 evenly embedded and installed inside the polishing disc body 51; after the ultraviolet lamp beads 52 are installed, they are sealed with insulating thermal conductive glue; the polishing pad 53 is a consolidated abrasive polishing pad; the abrasive material of the consolidated abrasive polishing pad is diamond.

[0059] The polishing liquid is a nano titanium dioxide dispersion with a concentration range of 0.5% to 2%. The polishing liquid spray is obtained by atomizing the polishing liquid with compressed air or oxygen. The spray pressure of the high-pressure polishing liquid is 0.1MPa to 1MPa.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A photocatalytically assisted spray polishing head, characterized in that: It comprises a central shaft (1), a gas-liquid coaxial transport assembly (2), an electric slip ring (3) and a polishing disc assembly (5); The central shaft (1) is a rotary stepped shaft structure, with two upper and lower step positioning surfaces in the middle part, a radial through hole is opened in the middle of the step positioning surface, and an inner hole flow channel is left in the axial direction in the part below the through hole; the step positioning surface is used to position and install the gas-liquid coaxial transport component, and the position of the through hole is aligned with the axial direction of the spray interface (26); a retaining spring groove is opened in the middle section of the central shaft (1), and a retaining spring (6) is installed in the retaining spring groove; a hose installation groove is provided at the bottom of the central shaft (1), and a hose (7) is installed in the hose installation groove, and the groove depth is the same as the wall thickness of the hose (7); The gas-liquid coaxial transport component (2) is used to realize the coaxial transport of the polishing spray during the rotation of the polishing head, and comprises a main shell (23), an upper bearing (24), a lower bearing (27), a rotary seal (25), a spray interface (26), a limit screw (21) and an electric slip ring limiter (22); the main shell (23) is cylindrical in shape, a through hole is opened in the center along the axial direction to be clearance-matched with the central axis (1), a threaded mounting hole connected to the through hole is opened at the center position of the side, and limit threaded mounting blind holes are provided on both sides of the shell at an angle of 90° to the threaded mounting hole, the threaded mounting hole is used to install the spray interface (26), and the threaded mounting blind hole is used to install the limit screw (21); The polishing disc assembly (5) comprises a polishing disc body (51), a coupling (4), an ultraviolet lamp bead (52), and a fixed abrasive polishing pad (53); the polishing disc body (51) contains four L-shaped flow channels and is centrally symmetrically distributed, each flow channel is provided with three pressure outlets downwardly, the distribution position of the pressure outlets corresponds to the gap between the grinding units of the fixed abrasive polishing pad (53) attached to the bottom of the polishing disc, and the polishing liquid can be sprayed evenly on the surface of the workpiece through the pressure outlets; the polishing disc body (51) is provided with four centrally symmetrical installation grooves at the interval of the L-shaped flow channels, each of which is provided with at least one ultraviolet lamp bead (52), and the positive and negative wires of the ultraviolet lamp bead (52) are connected to an external power supply through an electric slip ring (3); the upper end of the polishing disc body (51) is a hollow cylindrical section, on which a coupling (4) is installed, and is connected to the end section of the central shaft (1) and its inner flow channel through the coupling (4).

2. A photocatalytically assisted spray polishing head according to claim 1, characterized in that: A bearing mounting position and an annular mounting groove are provided at upper and lower symmetrical positions inside the main housing (23); the bearing mounting position is used to mount an upper bearing (24) and a lower bearing (27); a rotary seal (25) is installed in the annular mounting groove to ensure stable operation of the gas-liquid coaxial transport component and flow channel sealing when the polishing head is rotating; the limit screw (21) is sleeved with an electric slip ring limiter (22) so that the electric slip ring remains relatively still with the main housing (23) during the rotary operation of the polishing head.

3. A photocatalytically assisted spray polishing head according to claim 1, characterized in that: The top end of the central shaft (1) is provided with a connection section for docking with a machine tool; the central shaft (1) is provided with two or three through holes at a spray interface position corresponding to the gas-liquid coaxial transport component (2), and the through holes are evenly distributed along the circumference of the central shaft.

4. A photocatalytically assisted spray polishing head according to claim 1, characterized in that: The spray interface (26) is installed in the middle position of the shell through a threaded connection; the limit screw (21) is symmetrically installed in the threaded hole on the shell at a position 90° along the circumferential direction with the spray interface (26); the bearing and the rotary seal (25) are symmetrically installed in the shell of the gas-liquid coaxial transport component (2); the upper bearing (24) and the lower bearing (27) are ceramic bearings; the rotary seal (25) is a rotary combined seal ring or a pressure-resistant skeleton oil seal.

5. A photocatalytically assisted spray polishing head according to claim 1, characterized in that: The electric slip ring (3) is a 6-way 2A slip ring.

6. A photocatalytically assisted spray polishing head according to claim 1, characterized in that: The coupling (4) is a diaphragm coupling.

7. A photocatalytically assisted spray polishing head according to claim 1, characterized in that: The polishing disc body (51) is integrally formed by 3D printing or casting; the bottom of the polishing disc body is evenly distributed with spray outlets in a cross shape.

8. A photocatalytically assisted spray polishing head according to claim 1, characterized in that: The ultraviolet lamp beads (52) are three or four pieces uniformly embedded in the polishing disc body (51); after the ultraviolet lamp beads (52) are installed, they are potted with insulating heat-conducting glue.

9. A photocatalytically assisted spray polishing head according to claim 1, characterized in that: The polishing pad (53) is a fixed abrasive polishing pad; the abrasive material of the fixed abrasive polishing pad is diamond.

10. A photocatalytically assisted spray polishing head according to claim 1, characterized in that: The polishing liquid is a nano titanium dioxide dispersion with a concentration range of 0.5% to 2%. The polishing liquid spray is obtained by atomizing the polishing liquid with compressed air or oxygen. The spray pressure of the high-pressure polishing liquid is 0.1MPa to 1MPa.

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