CN218825302U - Electrohydraulic digital hydraulic driving device of tower type solar thermal power generation heliostat - Google Patents
Electrohydraulic digital hydraulic driving device of tower type solar thermal power generation heliostat Download PDFInfo
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- CN218825302U CN218825302U CN202222807394.4U CN202222807394U CN218825302U CN 218825302 U CN218825302 U CN 218825302U CN 202222807394 U CN202222807394 U CN 202222807394U CN 218825302 U CN218825302 U CN 218825302U
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/47—Mountings or tracking
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Abstract
The utility model relates to an electro-hydraulic digital hydraulic driving device of a tower-type solar thermal power generation heliostat, which comprises a tower top supporting bottom plate, a turntable bearing, a rotating assembly, a heliostat integral torque tube, a torque tube rotating hinge support seat, a pitching digital oil cylinder and a pair of horizontal rotating digital oil cylinders, wherein a middle trunnion of the pitching digital oil cylinder is hinged with a middle trunnion support seat of the pitching digital oil cylinder, and a front trunnion of the pitching digital oil cylinder is hinged with a radial support seat at the end part of the heliostat integral torque tube; the rear ear rings of the pair of horizontal rotating digital oil cylinders are hinged to the lower part of the extension plate made on the top surface of the rotating assembly, the front ear rings of the pair of horizontal rotating digital oil cylinders are respectively hinged with a horizontal cylinder driving connecting rod, and the horizontal cylinder driving connecting rods are fixedly connected with connecting rod fixing piles in the rotating assembly. According to the electro-hydraulic digital hydraulic driving device for the tower-type solar thermal power generation heliostat, the pitching motion and the horizontal motion of the heliostat are realized through the electro-hydraulic digital oil cylinder, the low-speed heavy-load motion can be met, the output torque is large, and the transmission precision is high.
Description
Technical Field
The utility model belongs to the technical field of the tower solar thermal energy electricity generation of clean energy, in particular to electric liquid digital hydraulic drive device of tower solar thermal energy electricity generation heliostat.
Background
Based on domestic large-scale heliostat drive arrangement all adopt gear drive or worm gear drive, and these devices all are nonstandard special design and processing, do not form standardization, integration and universalization. The driving device is driven by a stepping motor or a servo motor, and a set of multi-stage speed reducing device is required for transmission, so that the structure is very complex, the manufacturing difficulty is high, the processing is difficult, and the cost is quite high. The service life of the stepping motor and the servo motor in the field is greatly influenced by natural weather. In addition, the gear meshing device is worn and bitten to different degrees along with the time, so that the positioning accuracy of the heliostat when tracking the sun is influenced finally, and the outermost heliostat may be 1 km away from the focusing center of the heat absorption tower in a tower-type electric field. The gear abrasion causes irreversible error, namely, millicentimeter difference, the tracking precision of the heliostat is reduced within thousands of miles (the light reflected to the light-gathering tower is far away from the light spot value required by deviation), the photo-thermal efficiency of an electric field is reduced, and the larger the area of the heliostat is, the larger the torque loaded by wind is. If a gear reduction box is adopted, the size of the gear reduction box is increased, the processing difficulty is high, the cost of the whole device is increased, and meaningless economic loss is caused.
If the retrieved Chinese patent with the publication number of CN 207503053U discloses a heliostat tracking driving device, which comprises a rotary table and an azimuth angle adjusting device, wherein the rotary table is used for rotatably assembling a mirror bracket around a horizontal axis, the azimuth angle adjusting device is used for driving the mirror bracket to rotate around a vertical axis, the rotary table is provided with a telescopic cylinder hinged seat which is used for hinging the front end of a cylinder body of a telescopic cylinder, the azimuth angle adjusting device comprises a gear ring or a worm wheel which is rotatably arranged on the rotary table, the gear ring or the worm wheel is provided with a connecting part which is fixedly connected with a base of the heliostat, and the rotary table is also provided with a driving gear which is used for being meshed with the gear ring or a worm which is meshed with the worm wheel. The heliostat tracking driving device with the structure adopts the telescopic cylinder for pitching adjustment and adopts the driving gear structure driven by the hydraulic motor for the azimuth angle adjusting device, so the problems of complicated structure, easy abrasion and gradual decline of the positioning precision of the heliostat still exist.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide an electricity liquid digital hydraulic drive device of tower solar thermal energy power generation heliostat, pitching motion, the horizontal motion of its heliostat are all realized through electricity liquid digital cylinder, can satisfy low-speed heavy load motion, and output torque is big, transmission precision is high, the motion stationarity is high.
The utility model provides a its technical problem realize through following technical scheme:
the utility model provides an electricity liquid digital hydraulic drive device of tower solar thermal energy power generation heliostat, includes top of the tower supporting baseplate, turntable bearing, rotary assembly, the whole torque tube of heliostat, torque tube rotation hinge supporting seat, top of the tower supporting baseplate upper portion installation turntable bearing, the rotary assembly of turntable bearing outer lane installation, the top surface of rotary assembly is adorned admittedly torque tube and is rotated hinge supporting seat, and torque tube rotation hinge supporting seat is connected its characterized in that with the whole torque tube hinge of heliostat: the heliostat also comprises a pitching digital oil cylinder and a pair of horizontal rotating digital oil cylinders, wherein a middle trunnion of the pitching digital oil cylinder is hinged with a middle trunnion supporting seat of the pitching digital oil cylinder, the middle trunnion supporting seat of the pitching digital oil cylinder is fixedly installed with the cylinder wall of the rotating combination body, and a front trunnion of the pitching digital oil cylinder is hinged with the end part of the integral torque tube of the heliostat; the rear ear rings of the pair of horizontal rotating digital oil cylinders are hinged to the lower part of the extension plate on the top surface of the rotating assembly, the front ear rings of the pair of horizontal rotating digital oil cylinders are respectively hinged with a horizontal cylinder driving connecting rod, the horizontal cylinder driving connecting rods are fixedly connected with connecting rod fixing piles, and the connecting rod fixing piles are coaxially sleeved in the rotating assembly and fixedly installed with the tower top supporting bottom plate; and a hydraulic power unit is fixedly arranged on the upper surface of the extension plate of the rotating combination body and provides hydraulic power for the pitching digital oil cylinder and the pair of horizontal rotating digital oil cylinders.
And the angle between the horizontal cylinder driving connecting rods of the pair of horizontal rotating digital oil cylinders is 10-60 degrees.
And the two torque tube rotating hinge shaft supporting seats are arranged side by side and are connected with the integral torque tube of the heliostat through hinge shafts.
And the connecting rod fixing pile is coaxially fixed with the inner ring of the turntable bearing, and the cylinder wall of the rotary combination body is fixed with the outer ring of the turntable bearing.
And the pitch cylinder middle lug supporting seat of the hinged pitch motion digital cylinder middle trunnion and the extension plate of the rotary combination body hinged with the horizontal rotation digital cylinder rear lug ring are separated by 90 degrees in the horizontal circumferential direction.
The utility model discloses an advantage and beneficial effect do:
1. the electro-hydraulic digital hydraulic driving device of the tower type solar thermal power generation heliostat adopts a pitching motion digital oil cylinder and a pair of horizontal rotation digital oil cylinders as driving devices, wherein a middle trunnion of the pitching motion digital oil cylinder is hinged with a middle trunnion supporting seat of the pitching cylinder, the middle trunnion supporting seat of the pitching cylinder is fixedly installed with the cylinder wall of a rotating combination body, a front trunnion of the pitching motion digital oil cylinder is hinged with the end part of an integral torque tube of the heliostat, and when a hydraulic power unit controls the action of the pitching motion digital oil cylinder, the integral torque tube of the heliostat can be driven to do 90-degree pitching swinging motion around the rotating hinge shaft supporting seat of the torque tube along the horizontal axis; the rear trunnions of a pair of horizontal rotation digital oil cylinders are hinged to the lower portion of an extension plate made on the top surface of a rotation assembly, front trunnions are respectively hinged with a horizontal cylinder driving connecting rod, the horizontal cylinder driving connecting rods are fixedly connected with connecting rod fixing piles, the connecting rod fixing piles are coaxially sleeved in the rotation assembly and fixedly installed with a tower top supporting bottom plate, when a hydraulic power unit controls the horizontal rotation digital oil cylinders to move, the cylinder barrel of the horizontal rotation digital oil cylinders moves to drive the rotation assembly and a turntable bearing outer ring to swing together along a vertical axis within 180 degrees, the whole heliostat also starts to rotate as a heliostat torque tube rotates along with the rotation of the rotation assembly, the connecting rod fixing piles are connected with the tower top supporting bottom plate and fixed with a turntable bearing inner ring, and when the turntable bearing outer ring rotates, the connecting rod fixing piles and the inner ring of the rotation bearing are fixed.
2. According to the electro-hydraulic digital hydraulic driving device for the tower type solar thermal power generation heliostat, the angle between the horizontal cylinder driving connecting rods of the pair of horizontal rotating digital oil cylinders is a fixed angle, the structure is compact, and the cylinder barrel of the horizontal rotating digital oil cylinder acts to drive the rotary combination body and the outer ring of the turntable bearing to rotate together along the vertical axis within 180 degrees.
3. According to the electro-hydraulic digital hydraulic driving device of the tower type solar thermal power generation heliostat, the hydraulic power unit is arranged on the extension plate of the rotary combination body, stability and safety are kept, the hydraulic power unit and the pitching motion digital oil cylinder do not have relative displacement due to the fact that the hydraulic power unit and the horizontal motion digital oil cylinder rotate along the vertical central shaft, so that the high-pressure hose from the power unit to the middle of the oil cylinder does not follow up, and the relative displacement does not exist, and the service life of the high-pressure hose is guaranteed.
4. According to the electro-hydraulic digital hydraulic driving device of the tower type solar thermal power generation heliostat, the pitching motion digital oil cylinder is designed in a middle hinge shaft installation mode, the distance between the pivot point of the hinge shaft and the center of the front ear is only 365mm, so that when the piston of the pitching motion digital oil cylinder moves to the maximum stroke, the maximum installation distance is only 1315mm, the appearance size of the pitching motion digital oil cylinder can be reduced, and conditions are provided for reducing the cost of the device.
5. According to the electro-hydraulic digital hydraulic driving device of the tower type solar thermal power generation heliostat, the pitch cylinder middle lug supporting seat hinged with the pitch motion digital cylinder middle trunnion and the extension plate hinged with the extension plate of the rotary combination body of the horizontal rotation digital cylinder rear trunnion are separated by 90 degrees in the horizontal circumferential direction, so that the interference from the motion of the horizontal rotation digital cylinder is avoided.
6. The electro-hydraulic digital hydraulic driving device of the tower-type solar thermal power generation heliostat drives the pitching tracking motion of the sun through the pitching motion digital oil cylinder, the pair of horizontal rotation digital oil cylinders and the hydraulic power unit, can meet the requirement of low-speed heavy-load motion, and has the advantages of large output torque, high and controllable transmission precision, high motion stability, high rigidity and strength; the volume is large, the weight is light, the self-locking capability is strong, and the dust and sand prevention sealing performance is strong; the design and manufacture are simple, the popularization is easy, the cost is much lower than that of gear transmission, and the standardization, serialization and universalization are easy to realize; and is self-repairing and self-compensating for the repair of wear.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a left side view of FIG. 1;
FIG. 3 is a top view of FIG. 1;
fig. 4 is a schematic structural view of the connecting rod fixing pile of the present invention;
FIG. 5 is a schematic structural view of the tower top support base plate and the horizontal cylinder rear earring support seat of the present invention;
FIG. 6a is a diagram of a track of a horizontally rotating digital cylinder (0 °);
FIG. 6b is a diagram of the horizontal rotation digital cylinder trajectory (30 °);
FIG. 6c is a diagram of the trajectory of the horizontal rotation digital cylinder (60 °);
FIG. 6d is a diagram of the trajectory of the horizontal rotation digital cylinder (90 °);
FIG. 6e is a diagram of the horizontal rotation digital cylinder trajectory (120 °);
FIG. 6f is a diagram of the horizontal rotation digital cylinder trajectory (150 °);
FIG. 6g is a diagram of a horizontal rotation digital cylinder trajectory (180 °);
reference numerals
1-tower top supporting bottom plate, 2-turntable bearing,
3-rotating assembly, 4-pitching digital oil cylinder,
5-horizontal rotation digital oil cylinder, 6-hydraulic power unit,
7-torque tube rotating hinge shaft supporting seat, 8-pitching cylinder middle lug supporting seat,
9-extension plate, 10-second cylindrical pin,
11-a horizontal cylinder rear ear ring connecting guard plate, 12-a third cylindrical pin,
13-horizontal cylinder driving connecting rod, 14-inner ring of turntable bearing,
15-outer ring of turntable bearing, 16-integral torque tube of heliostat,
17-horizontal cylinder rear earring supporting seat, 18-connecting rod fixing pile,
19-a first cylindrical pin, 20-a south oil cylinder,
The 21-north oil cylinder and the 22-heliostat are along the vertical axis.
Detailed Description
The present invention will be described in further detail with reference to specific examples, which are provided for illustrative purposes only, and are not intended to be limiting, and the scope of the present invention should not be limited thereby.
The utility model provides an electricity liquid digital hydraulic drive device of tower solar thermal energy power generation heliostat, includes top of the tower supporting baseplate 1, carousel bearing 2, rotatory assembly 3, the whole torque tube 16 of heliostat, torque tube rotation hinge supporting seat 7, top of the tower supporting baseplate upper portion installation carousel bearing, the rotatory assembly of carousel bearing periphery rotation installation, the torque tube rotation hinge supporting seat is adorned admittedly to the top surface of rotatory assembly, torque tube rotation hinge supporting seat is connected with the whole torque tube hinge of heliostat. The torque tube rotating hinge shaft supporting seats are two in parallel arrangement, and the two torque tube rotating hinge shaft supporting seats are connected with the heliostat integral torque tube through hinge shafts in a hinged mode.
The electro-hydraulic digital hydraulic driving device of the tower type solar thermal power generation heliostat is characterized in that: the heliostat also comprises a pitching digital oil cylinder 4 and a pair of horizontal rotating digital oil cylinders 5, wherein a middle trunnion of the pitching digital oil cylinder is hinged with a middle trunnion support seat 8 of the pitching digital oil cylinder, the middle trunnion support seat of the pitching digital oil cylinder is fixedly installed with the cylinder wall of the rotating combined body, and a front trunnion of the pitching digital oil cylinder is hinged with the end part of the integral torque tube of the heliostat through a first cylindrical pin 19.
Rear earrings of a pair of horizontal rotation digital oil cylinders are hinged to a horizontal cylinder rear earring supporting seat 17 at the lower part of an extension plate 9 made on the top surface of the rotary assembly through a second cylindrical pin 10, the horizontal cylinder rear earring supporting seat and the end part of the extension plate are fixedly provided with a horizontal cylinder rear earring connecting guard plate 11, front earrings of the pair of horizontal rotation digital oil cylinders extend into the rotary assembly and are hinged to two horizontal cylinder driving connecting rods 13 through third cylindrical pins 12 respectively, the horizontal cylinder driving connecting rods 13 are fixedly connected with connecting rod fixing piles 18, and the connecting rod fixing piles are coaxially sleeved in the rotary assembly and fixedly mounted with the tower top supporting bottom plate 1. The connecting rod fixing pile 18 is coaxially fixed with the inner ring 14 of the turntable bearing, and the cylinder wall of the rotating combination body is fixed with the outer ring 15 of the turntable bearing.
The angle between two horizontal cylinder driving connecting rods of the pair of horizontal rotating digital oil cylinders is a fixed angle. Because the front earrings of the horizontal rotation digital oil cylinders are connected with the horizontal cylinder driving connecting rods, and the two horizontal cylinder driving connecting rods of the two horizontal rotation digital oil cylinders form a fixed included angle, the piston rods of the horizontal rotation digital oil cylinders are also immobile, so that only cylinder barrel movement can be realized when the hydraulic power unit controls the horizontal rotation digital oil cylinders to act, because the cylinder barrels of the horizontal rotation digital oil cylinders and the rotating assembly are connected into a whole through the extension plates and the second cylindrical pin, when the cylinder barrels of the horizontal rotation digital oil cylinders do reciprocating movement, the rotating assembly and the outer rings of the turntable bearings rotate together, and the heliostat rotates 180 degrees along the vertical axis.
The pair of horizontal rotation digital cylinders in the embodiment includes a south cylinder 20 and a north cylinder 21, and the track diagrams of the horizontal rotation digital cylinders are shown in fig. 6a, 6b, 6c, 6d, 6e, 6f and 6 g. Under the cooperation of the south oil cylinder 20 and the north oil cylinder 21, the heliostat can rotate 0-180 degrees along the vertical axis 22.
The heliostat rotates 0 degree to 180 degrees along the vertical axis, the operation sequence of the south oil cylinder 20 and the north oil cylinder 21 is as shown in table 1:
TABLE 1 motion sequence table for south cylinder 20 and north cylinder 21 when heliostat rotates 0-180 degree along vertical axis
FIG. 6 is a table showing the sequence of operation of the 20 and 21 hydraulic rams during a 180-0 rotation of the mechanism
| Horizontal azimuth | South cylinder | 20 | North cylinder | 21 motion |
| 180°-150° | Piston rod retraction | |
||
| 150°-120° | Piston rod retraction | |
||
| 120°-90° | Piston rod retraction | Piston rod extension | ||
| 90°-60° | Piston rod retraction | |
||
| 60°-30° | Piston rod extension | Piston rod extension | ||
| 30°-0° | Piston rod extension | Piston rod extension |
The hydraulic power unit 6 is fixedly arranged on the upper surface of an extension plate of the rotary combination body, adopts TDDL-00-4000-AC6-0055-00001 of Zhengbo Tiandi Hydraulic company Limited, and comprises a motor 0.55KW, an AC380V, a 50HZ and 450rpm, an electromagnetic valve, an oil pump 1.1cc/r and an oil tank 20L, adopts 20MPa system pressure, is arranged in a horizontal mode, and adopts a G3/8 oil port and three oil paths. The hydraulic power unit is respectively connected with the pitching digital oil cylinder and the pitching digital oil cylinder through three oil ways. Hydraulic power is provided for the pitching digital oil cylinder and the pair of horizontal rotating digital oil cylinders.
Because the hydraulic power unit, the extension plate of the rotating assembly and the horizontal movement digital oil cylinder rotate along the vertical central shaft, and the hydraulic power unit and the pitching movement digital oil cylinder do not have relative displacement, a control high-pressure hose between the power unit and the oil cylinder does not follow up, and no relative displacement exists, so that stability and safety are kept, and the service life of the high-pressure rubber hose is ensured.
A pitch cylinder middle lug supporting seat hinged with a pitch motion digital cylinder middle trunnion and an extension plate hinged with a rotary assembly of a horizontal rotation digital cylinder rear trunnion are spaced by 90 degrees in the horizontal circumferential direction. Interference from the movement of the horizontally rotating digital cylinder is avoided.
The working process of the electrohydraulic digital hydraulic driving device of the tower type solar thermal power generation heliostat is as follows:
when the hydraulic power unit controls the pitching motion digital oil cylinder to act, the integral torque tube of the heliostat can be driven to rotate around the torque tube, the hinge shaft supporting seat and perform 90-degree pitching swinging motion along the horizontal axis. When the hydraulic power unit controls the horizontal rotation digital oil cylinder to act, the cylinder barrel of the horizontal rotation digital oil cylinder acts to drive the rotary combination body and the outer ring of the turntable bearing to rotate along the vertical axis within 180 degrees. The pitching tracking motion of the sun is driven by the pitching motion digital oil cylinder, the pair of horizontal rotation digital oil cylinders and the hydraulic power unit.
Although the embodiments of the present invention and the accompanying drawings have been disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, alterations, and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and thus the scope of the invention is not limited to the embodiments and drawings disclosed.
Claims (5)
1. The utility model provides an electricity liquid digital hydraulic drive device of tower solar thermal energy power generation heliostat, including top of the tower supporting baseplate (1), slewing bearing (2), rotatory assembly (3), the whole torque tube of heliostat (16), torque tube rotation hinge supporting seat (7), top of the tower supporting baseplate (1) upper portion installation slewing bearing (2), slewing bearing (2) outer lane rotates installation rotatory assembly (3), torque tube rotation hinge supporting seat (7) is adorned admittedly to the top surface of rotatory assembly (3), torque tube rotation hinge supporting seat (7) is connected with the whole torque tube of heliostat (16) hinge, its characterized in that: the heliostat also comprises a pitching digital oil cylinder (4) and a pair of horizontal rotating digital oil cylinders (5), wherein a middle trunnion of the pitching digital oil cylinder (4) is hinged with a pitching middle ear supporting seat (8), the pitching middle ear supporting seat (8) is fixedly installed with the cylinder wall of the rotating assembly (3), and a front trunnion of the pitching digital oil cylinder (4) is hinged with the end part of the heliostat integral torque tube (16); the rear earrings of the pair of horizontal rotating digital oil cylinders (5) are hinged to the lower part of an extension plate (9) made on the top surface of the rotating assembly (3), the front earrings of the pair of horizontal rotating digital oil cylinders (5) are respectively hinged with a horizontal cylinder driving connecting rod (13), the horizontal cylinder driving connecting rods (13) are fixedly connected with connecting rod fixing piles (18), and the connecting rod fixing piles (18) are coaxially sleeved in the rotating assembly (3) and fixedly installed with the tower top supporting bottom plate (1); and a hydraulic power unit (6) is fixedly arranged on the upper surface of an extension plate (9) of the rotating assembly (3), and the hydraulic power unit (6) provides hydraulic power for the pitching digital oil cylinder (4) and the pair of horizontal rotating digital oil cylinders (5).
2. The electro-hydraulic digital hydraulic driving device of a tower-type solar thermal power generation heliostat of claim 1, wherein: the angle between the horizontal cylinder driving connecting rods (13) of the pair of horizontal rotating digital oil cylinders (5) is 10-60 degrees.
3. The electro-hydraulic digital hydraulic driving device of a tower-type solar thermal power generation heliostat of claim 1, wherein: the two torque tube rotating hinge shaft supporting seats (7) are arranged side by side, and the two torque tube rotating hinge shaft supporting seats (7) are hinged with the heliostat integral torque tube (16) through a hinge shaft.
4. The electro-hydraulic digital hydraulic driving device of a tower-type solar thermal power generation heliostat of claim 1, wherein: the connecting rod fixing pile (18) is coaxially fixed with the turntable bearing inner ring (14), and the cylinder wall of the rotary assembly (3) is fixed with the turntable bearing outer ring (15).
5. The electro-hydraulic digital hydraulic driving device of a tower-type solar thermal power generation heliostat of claim 1, wherein: a pitch cylinder middle ear supporting seat (8) of a middle trunnion of the hinged pitch motion digital oil cylinder (4) and an extension plate (9) of a rotary assembly body (3) of a hinged horizontal rotation digital oil cylinder (5) rear ear ring are spaced by 90 degrees in the horizontal circumferential direction.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2021230672037 | 2021-12-08 | ||
| CN202123067203 | 2021-12-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218825302U true CN218825302U (en) | 2023-04-07 |
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ID=87252747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222807394.4U Active CN218825302U (en) | 2021-12-08 | 2022-10-25 | Electrohydraulic digital hydraulic driving device of tower type solar thermal power generation heliostat |
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| Country | Link |
|---|---|
| CN (1) | CN218825302U (en) |
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2022
- 2022-10-25 CN CN202222807394.4U patent/CN218825302U/en active Active
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