CN218837243U - Big camber cylinder metal tower section of thick bamboo surface rust cleaning device that polishes - Google Patents
Big camber cylinder metal tower section of thick bamboo surface rust cleaning device that polishes Download PDFInfo
- Publication number
- CN218837243U CN218837243U CN202223586477.1U CN202223586477U CN218837243U CN 218837243 U CN218837243 U CN 218837243U CN 202223586477 U CN202223586477 U CN 202223586477U CN 218837243 U CN218837243 U CN 218837243U
- Authority
- CN
- China
- Prior art keywords
- grinding
- metal tower
- dust collection
- grinding wheel
- cylindrical metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
Abstract
The utility model provides a big camber cylinder metal tower section of thick bamboo surface rust cleaning device that polishes mainly solves current metal tower section of thick bamboo surface rust cleaning operation and mainly still is leading with manual work, and the mode that passes through lifting rope and safety rope from the top cabin is with artifical migration to operation department, and the rust cleaning of polishing is carried out to the mode of the handheld polisher of rethread, and the rust cleaning efficiency that not only polishes is low, hardly carries out stable, the high quality technical problem who polishes to the rust mark part moreover. Comprises a fixed frame, a polishing component, an adjusting component and a dust suction device for collecting scraps generated during polishing of the polishing component; the grinding assembly comprises a grinding wheel, two driving motors oppositely arranged at two ends of the grinding wheel and a connecting frame; the two driving motors are arranged on the connecting frame, and output shafts of the driving motors are connected with wheel shafts of the polishing wheels through connecting pieces; the adjusting component comprises an adjusting motor, a plurality of guide posts and a pressure feedback unit, wherein the adjusting motor, the guide posts and the pressure feedback unit are installed on the fixing frame.
Description
Technical Field
The utility model relates to a rust cleaning device polishes, concretely relates to big curvature cylinder metal tower section of thick bamboo surface rust cleaning device that polishes.
Background
The cylindrical metal tower barrel is a common structural form (such as a wind power tower barrel of a fan) of the existing building, and due to the fact that paint exposed on the surface of the metal tower barrel under severe conditions for a long time can fall off, the metal tower body is corroded, a large amount of rusts can be generated in a corrosion part, the rusted part needs to be polished and derusted firstly in the regular maintenance of the metal tower barrel, and therefore the follow-up paint spraying operation is facilitated.
The existing metal tower barrel surface polishing and rust removing operation mainly comprises manual operation, manual operation is carried to an operation position from a top cabin in a lifting rope and safety rope mode, polishing and rust removing are carried out in a handheld polishing machine mode, polishing and rust removing efficiency is low, and rust parts are difficult to polish stably and with high quality.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving present metal tower section of thick bamboo surface rust cleaning operation of polishing and mainly still be with manual work as leading, from the mode of top cabin through lifting rope and safety rope with artifical migration to operation department, the rust cleaning of polishing is carried out to the mode of the handheld polisher of rethread, not only the rust cleaning of polishing is inefficient, hardly stabilizes, the technical problem that the high quality was polished to the rust mark part moreover, and provides a big curvature cylinder metal tower section of thick bamboo surface rust cleaning device of polishing.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
the utility model provides a big curvature cylinder metal tower cylinder surface rust cleaning device that polishes which the special character lies in: the device comprises a fixed frame, a grinding assembly, an adjusting assembly and a dust suction device for collecting scraps generated during grinding of the grinding assembly;
the fixed frame is used for being connected with an external mobile device;
the grinding assembly comprises a grinding wheel, two driving motors and a connecting frame, wherein the two driving motors are oppositely arranged at two ends of the grinding wheel; the peripheral surface of the grinding wheel is used for contacting the surface of the cylindrical metal tower cylinder during grinding operation; the two driving motors are arranged on the connecting frame, and output shafts of the driving motors are connected with wheel shafts of the polishing wheels through connecting pieces;
the adjusting assembly comprises an adjusting motor, a plurality of guide posts and a pressure feedback unit, wherein the adjusting motor is installed on the fixing frame;
the output end of the adjusting motor penetrates through the fixing frame to be connected with the connecting frame and is used for driving the connecting frame to be far away from or close to the surface of the cylindrical metal tower cylinder; the pressure feedback unit is arranged on one side, far away from the connecting frame, of the fixing frame, the axial direction of the guide columns is parallel to the output direction of the adjusting motor, one ends of the guide columns are connected with the pressure feedback unit, and the other ends of the guide columns penetrate through the fixing frame to be connected with the connecting frame.
Further, the pressure feedback unit comprises a pressure trigger plate and a pressure sensor arranged on the fixed frame;
the pressure trigger plate is provided with a through hole matched with the appearance of the adjusting motor, and the adjusting motor penetrates through the through hole to be matched with the pressure trigger plate;
and one ends of the guide columns are connected with the pressure trigger plate.
Further, the connecting piece comprises a connecting bolt and a sleeve arranged on an output shaft of the driving motor;
the inner diameter of the sleeve is matched with the outer diameter of the grinding wheel axle, the sleeve is provided with a connecting hole, the grinding wheel axle is provided with a corresponding threaded hole, and the connecting bolt penetrates through the connecting hole to be connected with the threaded hole.
Further, the connecting bolt is a quick-release bolt.
Further, the dust suction device comprises a dust suction assembly, a dust suction pipe and a dust suction sealed cabin;
the dust collection assembly is arranged on the fixed frame and is positioned on the same side with the grinding wheel, the dust collection sealed cabin is arranged on the connecting frame, a mounting groove matched with the grinding wheel is formed in the dust collection sealed cabin, and the outer peripheral surface of the dust collection sealed cabin penetrates out of the mounting groove and is used for being in contact with the surface of the cylindrical metal tower cylinder during grinding operation;
one end of the dust suction pipe is connected with the dust suction component, and the other end of the dust suction pipe is arranged in the dust suction sealed cabin.
Furthermore, the dust collection assembly comprises a box body arranged on the fixed frame, and a dust collection motor, a guide pipe, a dust collection box and a protection box which are arranged in the box body;
the dust collection motor is arranged in the protective box, the input end of the dust collection motor is connected with one end of the dust collection pipe, the output end of the dust collection motor is connected with one end of the guide pipe, and the other end of the guide pipe penetrates through the protective box and is arranged in the dust collection box.
Furthermore, the fixing frame is provided with a plurality of mounting screw holes for connecting with an external mobile device.
Further, the grinding wheel is made of fiber materials.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model drives the grinding wheel to rotate by the double-drive motor, thereby not only enhancing the stability of the grinding wheel during rotation, but also increasing the torque of the grinding wheel and improving the grinding effect; the contact stress of the polishing wheel and the surface of the cylindrical metal tower can be monitored in real time through the adjusting motor and the pressure trigger plate, self-adaptive adjustment is carried out, the problem of polishing failure or poor effect caused by the fact that the polishing wheel is not in contact with the cylindrical metal tower is solved, and stable and high-quality polishing and rust removing operation is achieved.
2. The utility model discloses a dust absorption sealed cabin that sets up can enclose into a comparatively confined environment around the wheel of polishing for the residue gathering that produces of polishing is at the internal in cabin, and absorbs the residue through dust absorption subassembly and dust absorption pipe and keep in, and the residue that prevents to polish and produce causes environmental pollution.
Drawings
FIG. 1 is a schematic structural view of an embodiment of a large-curvature cylindrical metal tower surface polishing and rust removing device of the present invention; (the direction indicated by the arrow in the figure is the main view direction)
FIG. 2 is a front view of an embodiment of the polishing and rust removing device for the surface of a large-curvature cylindrical metal tower; (dust-collecting devices not shown in the figure)
FIG. 3 is a side view of an embodiment of the polishing and rust removing device for the surface of the large-curvature cylindrical metal tower; (the dust-collecting component is shown in the figure)
FIG. 4 is a schematic structural diagram of a dust removal assembly in an embodiment of the large-curvature cylindrical metal tower surface polishing and rust removing device of the utility model.
In the figure: 1-a fixed frame, 2-a grinding component, 21-a grinding wheel, 22-a driving motor, 23-a connecting frame and 24-a connecting piece; 3-adjusting component, 31-adjusting motor, 32-guiding column, 33-pressure trigger plate; 4-dust suction device, 41-dust suction assembly, 411-box body, 412-dust suction motor, 413-conduit, 414-dust box, 415-protective box, 42-dust suction pipe and 43-dust suction sealed cabin.
Detailed Description
In order to make the objects, advantages and features of the present invention clearer, the following detailed description of the polishing and rust removing device for a large-curvature cylindrical metal tower surface provided by the present invention is made with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following detailed description.
As shown in fig. 1-4, the surface polishing and rust removing device for a large-curvature cylindrical metal tower cylinder of the present invention comprises a fixing frame 1, a polishing assembly 2, an adjusting assembly 3, and a dust collecting assembly 41 for collecting the scraps generated during polishing by the polishing assembly 2;
the fixing frame 1 is of an I-shaped structure and can provide a mounting position for subsequent components, and the fixing frame 1 is used for being connected with an external mobile device.
The grinding assembly 2 comprises a grinding wheel 21, two driving motors 22 oppositely arranged at two ends of the grinding wheel 21 and a connecting frame 23; the peripheral surface of the polishing wheel 21 is used for contacting the surface of the cylindrical metal tower barrel during polishing operation, and the axial direction of the wheel shaft of the polishing wheel 21, the axial direction of the output shaft of the driving motor 22 and the connecting frame 23 are all arranged in parallel to the end surface of the mounting frame with the largest area; the connecting frame 23 is a rectangular frame body and can provide mounting positions for subsequent components, the two driving motors 22 are mounted at two ends of the connecting frame 23, and output shafts of the driving motors 22 are connected with wheel shafts of the grinding wheels 21 through connecting pieces 24; in this embodiment, the connecting member 24 includes a connecting bolt and a sleeve installed on the output shaft of the driving motor 22, the inner diameter of the sleeve is matched with the outer diameter of the axle of the grinding wheel 21, a connecting hole is opened on the sleeve, a corresponding threaded hole is opened on the axle of the grinding wheel 21, the connecting bolt passes through the connecting hole and is connected with the threaded hole, and the axle of the grinding wheel 21 and the output shaft of the driving motor 22 are connected into a whole; further, in order to facilitate quick disassembly for replacing the grinding wheel 21, the connecting bolt can be a quick-release bolt; in other embodiments of the present invention, the connection between the driving motor 22 and the grinding wheel 21 can be realized by using the quick-release connecting member 24 with other structures; because the polishing device of the utility model is mostly applied to metal surfaces, metals generally have larger hardness, in order to realize better polishing effect and reduce the times of disassembly, assembly and replacement of the polishing wheel 21, in the embodiment, the polishing wheel 21 is made of fiber materials;
the adjusting component 3 comprises an adjusting motor 31 arranged on the fixed frame 1, a plurality of guide columns 32 and a pressure feedback unit; the adjusting motor 31 is a linear motor, the output direction of the adjusting motor is perpendicular to the outer peripheral surface of the cylindrical metal tower tube, so that the polishing wheel 21 is driven to a position tightly attached to the outer peripheral surface of the cylindrical metal tower tube, and the output end of the adjusting motor 31 penetrates through the fixed frame 1 to be connected with the connecting frame 23 and is used for driving the connecting frame 23 to be far away from or close to the surface of the cylindrical metal tower tube, so that the driving motor 22 connected to the connecting frame 23 is driven to move along with the connecting frame 23, and the polishing wheel 21 is driven to move; in order to facilitate real-time monitoring of the contact stress between the polishing wheel 21 and the surface of the cylindrical metal tower, and prevent the phenomenon of polishing failure or poor polishing effect caused by the small contact stress between the polishing wheel 21 and the cylindrical metal tower from occurring, the utility model discloses a pressure feedback unit is arranged for real-time monitoring, and is arranged on one side of the fixed frame 1, which is far away from the connecting frame 23, and comprises a pressure sensor and a pressure trigger plate 33 which are arranged on the mounting frame; the pressure trigger plate 33 is arranged in parallel to the connecting frame 23, a through hole matched with the shape of the adjusting motor 31 is formed in the pressure trigger plate 33, and the adjusting motor 31 penetrates through the through hole to be matched with the pressure trigger plate 33; the axial direction of the guide columns 32 is parallel to the output direction of the adjusting motor 31, in this embodiment, the number of the guide columns 32 is four, the four guide columns 32 are uniformly arranged at four corners of the pressure trigger plate 33, one end of each guide column 32 is connected with the pressure trigger plate 33, the other end of each guide column 32 penetrates through the fixing frame 1 to be connected with the connecting frame 23, when the adjusting motor 31 drives the connecting frame 23 to move, the pressure trigger plate 33 can be synchronously moved by the guide columns 32, when the polishing wheel 21 is attached to the surface of the cylindrical metal tower, the pressure trigger plate 33 can be attached to a pressure sensor on the mounting frame, the signal output end of the pressure sensor is connected with an external controller, the contact stress between the polishing wheel 21 and the surface of the cylindrical metal tower can be fed back in real time by the pressure between the pressure trigger plate 33 and the pressure sensor, and the adjusting motor 31 is controlled to adjust the contact stress between the polishing wheel 21 and the surface of the cylindrical metal tower;
the dust suction device 4 comprises a dust suction assembly 41, a dust suction pipe 42 and a dust suction sealed cabin 43; the dust collection assembly 41 is mounted on the fixed frame 1, the dust collection sealed cabin 43 is mounted on the connecting frame 23 and is located on the same side as the grinding wheel 21, a mounting groove matched with the grinding wheel 21 is formed in the dust collection sealed cabin 43, the grinding wheel 21 is located in the dust collection sealed cabin 43, the outer peripheral surface of the grinding wheel penetrates out of the mounting groove and is in contact with the surface of the cylindrical metal tower barrel during grinding operation, the grinding wheel 21 can be arranged in the dust collection sealed cabin 43 except for a part of the surface in contact with the cylindrical metal tower barrel through the dust collection sealed cabin 43, therefore, the working area of the grinding wheel 21 is arranged in a sealed environment, diffusion of rust removal residues is reduced, and an implementation basis is provided for subsequently sucking away the rust removal residues through the dust collection assembly 41; the structure of the dust collection assembly 41 is similar to that of a dust collector, and as shown in fig. 4, the dust collection assembly 41 comprises a box 411 mounted on the fixed frame 1, and a dust collection motor 412, a conduit 413, a dust collection box 414 and a protection box 415 which are arranged in the box; the dust suction motor 411 is arranged in the protective box 415, the input end of the dust suction motor 412 is connected with one end of the dust suction pipe 42, the output end is connected with one end of the guide pipe 412, and the other end of the guide pipe 412 penetrates through the protective box 415 and is arranged in the dust collection box 414; when the dust collection box is in work, particles sucked by dust fall into the dust collection box 414 under the dual actions of gravity and the dust collection motor 412, the other end of the dust collection pipe 42 is arranged in the dust collection sealed cabin 43, the dust collection pipe 42 is made of soft materials, and the dust collection sealed cabin 43 moves along with the connecting frame 23, so that the dust collection pipe 42 is required to have a certain margin, and the movement requirement of the dust collection sealed cabin 43 can be met; cables in the polishing device are all quick-insertion type joints, so that quick disassembly and assembly of a circuit can be realized; when the device is used, the grinding wheel 21 is adjusted to the position in contact with the surface of the cylindrical metal tower drum through the adjusting motor 31, then the driving motor 22 drives the grinding wheel 21 to rotate at a high speed for grinding, and during grinding, the contact stress is fed back in real time through the pressure feedback unit and pressure compensation is performed, so that the contact stress between the grinding wheel 21 and the surface of the cylindrical metal tower drum is always in the most appropriate range; meanwhile, particles generated during polishing are sucked into the dust box through the dust suction pipe 42, so that the environment is prevented from being polluted.
Claims (8)
1. The utility model provides a big curvature cylinder metal tower section of thick bamboo surface rust cleaning device of polishing which characterized in that: comprises a fixed frame (1), a grinding component (2), an adjusting component (3) and a dust suction device (4) for collecting scraps generated during grinding of the grinding component (2);
the fixing frame (1) is used for being connected with an external mobile device;
the grinding assembly (2) comprises a grinding wheel (21), two driving motors (22) which are oppositely arranged at two ends of the grinding wheel (21) and a connecting frame (23); the peripheral surface of the grinding wheel (21) is used for contacting the surface of the cylindrical metal tower cylinder during grinding operation; the two driving motors (22) are both arranged on a connecting frame (23), and output shafts of the driving motors (22) are connected with wheel shafts of the grinding wheels (21) through connecting pieces (24);
the adjusting assembly (3) comprises an adjusting motor (31) arranged on the fixing frame (1), a plurality of guide columns (32) and a pressure feedback unit;
the output end of the adjusting motor (31) penetrates through the fixed frame (1) to be connected with the connecting frame (23) and is used for driving the connecting frame (23) to be far away from or close to the surface of the cylindrical metal tower; the pressure feedback unit sets up in mount (1) and keeps away from link (23) one side, and is a plurality of the axial of guide post (32) all sets up with the output direction parallel arrangement of adjusting motor (31), guide post (32) one end is connected with the pressure feedback unit, and the other end passes mount (1) and is connected with link (23).
2. The large-curvature cylindrical metal tower surface grinding and rust removing device as claimed in claim 1, wherein: the pressure feedback unit comprises a pressure trigger plate (33) and a pressure sensor arranged on the fixed frame (1);
a through hole matched with the appearance of the adjusting motor (31) is formed in the pressure trigger plate (33), and the adjusting motor (31) penetrates through the through hole to be matched with the pressure trigger plate (33);
one end of each guide column (32) is connected with a pressure trigger plate (33).
3. The device for grinding and derusting the surface of the large-curvature cylindrical metal tower barrel according to claim 2, characterized in that: the connecting piece (24) comprises a connecting bolt and a sleeve arranged on an output shaft of the driving motor (22);
the inner diameter of the sleeve is matched with the outer diameter of a wheel shaft of the grinding wheel (21), a connecting hole is formed in the sleeve, a corresponding threaded hole is formed in the wheel shaft of the grinding wheel (21), and the connecting bolt penetrates through the connecting hole to be connected with the threaded hole.
4. The device for grinding and derusting the surface of the large-curvature cylindrical metal tower barrel according to claim 3, wherein the device comprises: the connecting bolt is a quick-release bolt.
5. The device for grinding and derusting the surface of the large-curvature cylindrical metal tower barrel according to any one of claims 1 to 4, wherein: the dust suction device (4) comprises a dust suction assembly (41), a dust suction pipe (42) and a dust suction sealed cabin (43);
the dust collection assembly (41) is installed on the fixing frame (1), the dust collection sealed cabin (43) is installed on the connecting frame (23) and located on the same side with the grinding wheel (21), an installation groove matched with the grinding wheel (21) is formed in the dust collection sealed cabin (43), the grinding wheel (21) is located in the dust collection sealed cabin (43), the outer peripheral surface of the grinding wheel penetrates out of the installation groove, and the installation groove is used for being in contact with the surface of the cylindrical metal tower cylinder during grinding operation;
one end of the dust suction pipe (42) is connected with the dust suction component (41), and the other end is arranged in the dust suction sealed cabin (43).
6. The device for grinding and derusting the surface of the large-curvature cylindrical metal tower barrel according to claim 5, wherein: the dust collection assembly (41) comprises a box body (411) arranged on the fixed frame (1), and a dust collection motor (412), a conduit (413), a dust collection box (414) and a protection box (415) which are arranged in the box body (411);
the dust collection motor (412) is arranged in the protection box, the input end of the dust collection motor (412) is connected with one end of the dust collection pipe (42), the output end of the dust collection motor is connected with one end of the guide pipe (413), and the other end of the guide pipe (413) penetrates through the protection box (415) and is arranged in the dust collection box (414).
7. The device for grinding and derusting the surface of the large-curvature cylindrical metal tower barrel according to claim 6, wherein: the fixing frame (1) is provided with a plurality of mounting screw holes for being connected with an external mobile device.
8. The large-curvature cylindrical metal tower surface grinding and rust removing device as claimed in claim 7, wherein: the grinding wheel (21) is made of fiber materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223586477.1U CN218837243U (en) | 2022-12-30 | 2022-12-30 | Big camber cylinder metal tower section of thick bamboo surface rust cleaning device that polishes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223586477.1U CN218837243U (en) | 2022-12-30 | 2022-12-30 | Big camber cylinder metal tower section of thick bamboo surface rust cleaning device that polishes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218837243U true CN218837243U (en) | 2023-04-11 |
Family
ID=87294818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223586477.1U Active CN218837243U (en) | 2022-12-30 | 2022-12-30 | Big camber cylinder metal tower section of thick bamboo surface rust cleaning device that polishes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218837243U (en) |
-
2022
- 2022-12-30 CN CN202223586477.1U patent/CN218837243U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN212287136U (en) | Building construction scaffold pipe fitting outer wall rust cleaning device | |
| CN109371225B (en) | Be used for automatic ultrasonic impact to dispel welding residual stress machine | |
| CN202088073U (en) | Rust cleaning part for steel strand | |
| CN218837243U (en) | Big camber cylinder metal tower section of thick bamboo surface rust cleaning device that polishes | |
| CN116967785A (en) | Angle control device for machining steel structure groove | |
| CN115783164A (en) | Efficient hull laser cleaning equipment and method | |
| CN212977971U (en) | Steel construction environmental protection sand blasting unit | |
| CN110871387B (en) | I-shaped steel column section rust cleaning device for construction | |
| CN212945519U (en) | Steel sheet processing drilling equipment | |
| CN111021167B (en) | Rail fastener elastic strip rust removal and corrosion prevention device | |
| CN214600551U (en) | Pretreatment device for repairing roller surface of high-pressure roller mill | |
| CN219401874U (en) | Cleaning mechanism for punch production | |
| CN213527904U (en) | Environment-friendly dust removal equipment for construction engineering construction site | |
| CN112796184B (en) | Steel rail rust removing robot | |
| CN219852285U (en) | New energy automobile motor conductive column mills grinding device | |
| CN216098222U (en) | Thick wall Z type steel member drying and polishing equipment of bending | |
| CN219730485U (en) | Bottom fixing device of jack | |
| CN215238347U (en) | Improved mantle fiber device for steel component machining | |
| CN218013589U (en) | Self-positioning clamping electrostatic spraying device | |
| CN220128469U (en) | Polishing equipment for wind power tower production | |
| CN220613294U (en) | Rust removal device for shipbuilding pipeline | |
| CN217648065U (en) | Linear steel pipe pole production and processing device | |
| CN210877298U (en) | Wire cutting device is used in processing of wind-powered electricity generation bearing steel ball | |
| CN220680253U (en) | Galvanized square pipe processing and polishing equipment | |
| CN217977243U (en) | Ball nut transmission structure with dustproof function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |