CN219708158U - Coaxial cascade shaftless screw conveyor - Google Patents
Coaxial cascade shaftless screw conveyor Download PDFInfo
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- CN219708158U CN219708158U CN202320944845.0U CN202320944845U CN219708158U CN 219708158 U CN219708158 U CN 219708158U CN 202320944845 U CN202320944845 U CN 202320944845U CN 219708158 U CN219708158 U CN 219708158U
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- shaftless screw
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- screw conveyor
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- 239000000463 material Substances 0.000 claims abstract description 31
- 230000007246 mechanism Effects 0.000 claims abstract description 20
- 230000005540 biological transmission Effects 0.000 claims description 23
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 abstract description 9
- 238000012423 maintenance Methods 0.000 abstract description 7
- 239000010802 sludge Substances 0.000 abstract description 7
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 238000007599 discharging Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- -1 grid residue Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- Screw Conveyors (AREA)
Abstract
The utility model provides a coaxial cascade shaftless screw conveyor, which comprises a plurality of single-stage shaftless screw conveyors which are coaxially connected, wherein the single-stage shaftless screw conveyor comprises: a shaftless propeller blade rotatably disposed within the housing; the circumference bearing supporting mechanism is fixed at two ends of the shell and comprises bearings which are arranged at two ends of the shell and are coaxially arranged with the shell, and connecting pieces which are fixedly connected with the inner rings of the bearings, and the outer diameter parts of two ends of the shaftless screw propeller blade are fixed on the connecting pieces; the driving mechanism is arranged at the bottom of the shell and is used for driving the connecting piece to rotate around the axis of the shell and driving the shaftless propeller blades to rotate, and the shaftless propeller blades push materials to axially move through blade inclined planes of the shaftless propeller blades to convey the materials. The utility model can realize that the two ends of the shaftless propeller blade are supported, and an abrasion-resistant lining is not required to be additionally arranged between the outer circumference of the blade and the inner wall of the shell, thereby being applicable to conveying thick oil sludge containing heavy metals and the like, reducing maintenance period, lowering operation cost and increasing conveying capacity.
Description
Technical Field
The utility model relates to the technical field of material conveying equipment, in particular to a coaxial cascade shaftless screw conveyor which is suitable for long-distance low-cost high-efficiency conveying of viscous oil sludge materials easy to wind.
Background
At present, screw conveyors are commonly called screw conveyors, and are widely applied to mineral products, feeds, grain and oil, construction industry and emerging environmental pollution treatment industry, and screw conveyor structures for conveying material displacement are divided into two main types, namely shaft screw conveyors and shaftless screw conveyors. The shaft type screw conveyor is mainly used for conveying various loose materials such as powder, granules, small blocks and the like; shaftless screw conveyors are commonly used for conveying materials that are prone to entanglement in viscous, agglomerated materials, such as sludge, grid residue, concrete, household garbage, and oilfield oily sludge.
The shaft screw conveyor is supported by bearings at two ends by the central shaft of the blade and drives the rotation conveying material.
Because the common shaftless screw conveyor does not have a middle shaft, the screw blade can only be supported by a central bearing at one end of a rotation center, the whole screw blade is in a cantilever beam structure, the extended whole blade sags due to large deflection, a multi-point support is formed by leaning on the inner wall of the shell, so that a plurality of permanent mechanical wear parts are caused in the rotation operation process, and a wear-resistant lining plate is required to be arranged between the screw blade and the inner wall of the shell to resist the mechanical wear.
Disclosure of Invention
Aiming at the technical problems, the utility model aims to provide a coaxial cascade shaftless screw conveyor, which can realize that two ends of a shaftless screw blade are supported, and an abrasion-resistant lining is not required to be additionally arranged between the outer circumference of the blade and the inner wall of a shell, so that the coaxial cascade shaftless screw conveyor is suitable for conveying viscous oil sludge containing heavy metals and the like, reduces maintenance period, lowers operation cost and increases conveying quantity.
To achieve the above object, the present utility model provides a coaxial cascade shaftless screw conveyor comprising a plurality of single-stage shaftless screw conveyors coaxially connected, wherein the single-stage shaftless screw conveyor comprises: a shaftless propeller blade rotatably disposed within the housing; the circumference bearing supporting mechanism is fixed at two ends of the shell and comprises bearings which are arranged at two ends of the shell and are coaxially arranged with the shell, and connecting pieces which are fixedly connected with the inner rings of the bearings, and the outer diameter parts of the two ends of the shaftless screw propeller blade are fixed on the connecting pieces; the driving mechanism is arranged at the bottom of the shell and is used for driving the connecting piece to rotate around the axis of the shell and driving the shaftless propeller blades to rotate, and the shaftless propeller blades push materials to axially move through blade inclined planes of the shaftless propeller blades to convey the materials.
The shaftless propeller blade is fixed on the circumferential bearing supporting mechanisms at the two ends, the whole double-end supporting stress deflection is small, a wear-resistant material lining is not required to be filled between the blade and the inner wall of the shell, or the wear-resistant material is not required to be additionally arranged on the outer circumference of the blade and the inner wall of the shell, so that the shaftless propeller blade is simple in structure and low in maintenance cost; the shaftless propeller blade is used as an integral rotating shaft, the outer circumference of the shaftless propeller blade is fixed on circumferential bearing supporting mechanisms at two ends, the rotating center is hollow, barrier-free and axially feeding and discharging can be realized, coaxial multistage cascade connection can be realized, a front stage output port is directly connected with a rear stage input port, and the length of the conveyor can be prolonged by multistage cascade connection; the coaxial direct-connection shell of the front-stage output port and the rear-stage input port has high utilization rate and large material conveying capacity.
In addition, the shaftless propeller blade supported by the double-end outer circumferential bearing is equivalent to a loaded simply supported beam or an approximately two-end fixed beam, the deflection is small, the blade does not need to rotate on the inner wall of the shell by being supported by the circumferential outer diameter of the blade, and a lining wear-resistant layer is not needed. The two ends of the integral propeller blade are supported by bearings to rotate, the integral propeller blade is not contacted with the inner wall of the shell, no mechanical abrasion exists, the maintenance workload is reduced, the running cost is reduced, and the service life is prolonged.
Preferably, the connecting piece comprises a gear which is coaxially arranged with the bearing and is fixed with the inner ring of the bearing, and a screw connecting strip which is fixedly connected with the gear, and the other end of the screw connecting strip is fixed with the outer diameter part of the shaftless screw blade.
The shaftless propeller blade is connected with the gear through the propeller connecting strip, the bearing is adopted to support and the shaftless propeller blade is driven to rotate through the gear, the deflection of the whole propeller blade is small, the rotating blade is not required to be supported by the inner wall of the shell, the abrasion-resistant lining is not required to be additionally arranged, multistage concentric series connection can be realized, and the spiral propeller blade is used for long-distance conveying of viscous and easily-wound materials and has a wide application range. The two ends of the integral propeller blade are supported by bearings to rotate through the screw connecting strips, the wear-resistant lining of the inner wall is eliminated, the utilization rate of the passage is increased, and the conveying capacity is increased.
Optionally, the number of the screw connecting strips is multiple, and the screw connecting strips are uniformly distributed along the circumferential direction of the shaftless screw blade.
The outer peripheral part of the shaftless propeller blade is connected with the gear through a plurality of propeller connecting strips, so that the connection stability between the shaftless propeller blade and the gear is improved.
Optionally, the actuating mechanism includes gear motor, installs drive pinion on gear motor's the output shaft, with the driven pinion of drive pinion meshing connection, driven pinion installs on the transmission shaft, install on the transmission shaft with the coaxial drive intermediate wheel that sets up of driven pinion, the gear with drive intermediate wheel meshing connection.
The rotation of the shaftless screw propeller blade is more stable and reliable through the meshing transmission among the gears; the gears at two ends are driven to rotate simultaneously through the transmission of the transmission shaft, and the transmission shaft synchronously drives the gears to rotate, so that the transmission efficiency is improved. The outer circle Zhou Shuangduan supports the concentric coaxial connection between the stages, and the synchronous driving of the transmission shafts increases the torsional rigidity of the integral blade, thereby being beneficial to the long-distance efficient material conveying.
Preferably, axial end caps are mounted at both ends of the housing.
Preferably, the transmission shafts of two adjacent single-stage shaftless screw conveyors are connected through a coupling and used for driving the plurality of single-stage shaftless screw conveyors to synchronously rotate; the shells of two adjacent single-stage shaftless screw conveyors are connected through cascade flanges.
The shaftless propeller blades supported by the double-end outer circumference bearings can be used for lengthening the length of the conveyor in a multistage coaxial series connection manner, transmission shafts are arranged between the stages to synchronously drive the rotation, the shaftless propeller blades are small in distortion, high in rigidity and large in conveying capacity, and long-distance efficient conveying of materials is facilitated. The centers of all stages of shells coaxially connected with the propeller blades are free from shaft and barrier, and the translational smooth conveying amount of materials is large and high in efficiency.
Further, the coaxial cascade shaftless screw conveyor is arranged horizontally or vertically.
From the above, vertical installation uses the axial feeding to adapt to more viscous bulk material with larger overall tension. The single-stage vertical installation can axially feed and discharge, has large open channel and is widely applicable to materials. The shaftless propeller blade supported by the bearing with the outer circumference of the two ends is small in vertical installation volume, large in material throughput and high in efficiency. The feed inlet and the feed outlet supported by the two ends of the shaftless propeller blade can be axially or radially arranged, can also be vertically used in a single stage, and is flexible to apply.
Drawings
In order to more clearly illustrate the technical solutions of the present utility model, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the construction of a single-stage shaftless screw conveyor of the present utility model;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a partial cross-sectional view of FIG. 1;
FIG. 4 is a schematic diagram of a cascade connection of two shaftless screw conveyors, wherein (a) is a schematic diagram of axial feeding and discharging long distance conveying of an interstage coaxial connection of the shaftless screw conveyor of the present utility model; (b) Schematic diagram of long-distance conveying of radial feeding and discharging of interstage staggered connection of a shaftless screw conveyor supported by a traditional center bearing;
fig. 5 is a schematic structural view of the vertical shaftless screw conveyor of the present utility model.
Wherein, 1-a gear motor; 2-a circumferential bearing support mechanism; 3-radial feed inlet; 4-a housing; 5-shaftless propeller blades; 6-an axial end cap; 7-radial discharge holes; 8-a transmission shaft; 9-driving the intermediate wheel; 10-a drive pinion; 11-cascading flanges; 12-a helix connecting strip; 13-left end big bearing; 14-driving a large gear; 15-a big bearing at the right end; 16-helical connector strips; 17-a follower gear; 18-driving the intermediate wheel; 19-a feed inlet deflector rod, 20-an axial feed inlet, 21-a driving motor and 22-an axial discharge outlet.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Aiming at the problem that heavy metals are contained in viscous oil sludge which is easy to wind and the heavy metals are contained in the oil sludge to cause serious abrasion of a conventional shaftless screw conveyor, the utility model provides a coaxial cascade shaftless screw conveyor, which is shown in fig. 1 to 5, and comprises a plurality of single-stage shaftless screw conveyors which are coaxially connected, wherein the single-stage shaftless screw conveyor mainly comprises shaftless screw paddles 5, a circular tube-shaped shell 4, a circumferential bearing supporting mechanism 2, a driving mechanism and a feed inlet and a feed outlet. Axial end caps 6 are mounted at both ends of the housing 4. The upper part and the lower part of the shell 4 are respectively provided with a radial feeding hole 3 and a radial discharging hole 7.
The shaftless propeller blade 5 is rotatably arranged in the circular tube-shaped shell 4, the circumferential bearing supporting mechanism 2 is fixed at two ends of the circular tube-shaped shell 4, the circumferential bearing supporting mechanism 2 comprises a left end big bearing 13 and a right end big bearing 15 which are arranged at two ends of the shell 4 and are coaxial with the shell 4, and connecting pieces fixedly connected with inner rings of the left end big bearing 13 and the right end big bearing 15, and outer diameter parts of two ends of the shaftless propeller blade 5 are fixed on the connecting pieces. The driving mechanism is arranged at the bottom of the shell 4 and is used for driving the connecting piece to rotate around the axis of the shell 4 and driving the shaftless propeller blades 5 to coaxially rotate, and the shaftless propeller blades 5 push materials to axially move through the blade inclined planes of the shaftless propeller blades to convey the materials.
The connecting piece comprises a driving large gear 14 and a driven large gear 17 which are coaxially arranged with a left end large bearing 13 and a right end large bearing 15 and are fixed with inner rings of the left end large bearing 13 and the right end large bearing 15, and spiral connecting strips 12 and 16 fixedly connected with the driving large gear 14 and the driven large gear 17, wherein the other ends of the spiral connecting strips 12 and 16 are fixed with outer diameter parts of two ends of the shaftless spiral blade 5. Preferably, a plurality of screw connecting strips 12 and 16 are arranged between the outer diameter parts of the two ends of the shaftless screw blade 5 and the driving large gear 14 and the following large gear 17, and are uniformly distributed along the circumferential direction of the shaftless screw blade 5, so that the connection stability between the shaftless screw blade 5 and the driving large gear 14 and the following large gear 17 is improved. The two ends of the whole shaftless propeller blade 5 are supported by gears and bearings, the shaftless propeller blade 5 is not contacted with the inner wall of the shell, no mechanical abrasion exists, the maintenance workload is reduced, the operation cost is reduced, the service life is prolonged, the abrasion-resistant lining of the inner wall of the shell is eliminated, the through utilization rate is increased, and the conveying capacity is increased.
The driving mechanism comprises a gear motor 1 and a pinion pair arranged on an output shaft of the gear motor 1, a driving large gear 14 is in transmission connection with the pinion pair, the pinion pair is driven to rotate through the gear motor 1, and then the driving large gear 14 and a driven large gear 17 are driven to rotate, so that the shaftless propeller blades 5 are driven to rotate around the axis of the shell 4 through the propeller connecting strips 12 and 16. The pinion pair comprises a driving pinion 10 arranged on an output shaft of the gear motor 1, a driven pinion meshed with the driving pinion 10, the driven pinion is arranged on a transmission shaft 8, driving idle gears 9 and 18 coaxially arranged with the driven pinion are arranged on the transmission shaft 8, a driving large gear 14 and a driven large gear 17 are meshed with the driving idle gears 9 and 18, the transmission shaft 8 is driven to rotate through the driving pinion 10 and the driven pinion which are meshed with each other, the driving idle gears 9 and 18 are synchronously driven to rotate through the rotation of the transmission shaft 8, the driving idle gears 14 and the driven large gears 17 are driven to rotate through the meshed connection between the driving idle gears 9 and 18 and the gears, and then the screw connecting strips 12 and 16 and the shaftless screw paddles 5 are driven to rotate.
In the utility model, the transmission shafts 8 of two adjacent single-stage shaftless screw conveyors are connected through a coupling and used for dragging a plurality of single-stage shaftless screw conveyors to synchronously rotate. The shells 4 of two adjacent single-stage shaftless screw conveyors are connected through a cascade flange 11, multiple stages can be coaxially connected in series to increase the conveying length, the stages are concentrically and coaxially connected with the stages, and the torsional rigidity of the integral paddles is increased by synchronous driving of a transmission shaft 8, so that the long-distance efficient conveying of materials is facilitated.
The coaxial cascade shaftless screw conveyor is horizontally arranged or vertically arranged. As shown in fig. 5, the upper end of the single-stage vertical type shaftless screw conveyor is an axial feeding hole 20, the inner circumferential surface of the axial feeding hole 20 is provided with a feeding hole stirring rod 19 connected with the screw connecting strip 12, the lower end of the vertical type shaftless screw conveyor is an axial discharging hole 22, the vertical type installation can axially feed and discharge, the diameter is large, and the material is widely applicable.
The two ends of the rotating circumference of the shaftless propeller blade are supported by the circumference bearing supporting mechanism to rotate, the whole propeller blade is in a simple supporting beam structure or is similar to a fixed beam at two ends, the two ends of the outer circumference of the blade are supported, the deflection of the extended whole propeller blade is greatly reduced, a wear-resistant lining plate is not required to be arranged between the propeller blade and the inner wall of the shell, no mechanical abrasion is caused, and the maintenance and operation cost is low.
The working principle of the coaxial cascade shaftless screw conveyor of the present utility model will be briefly described with reference to fig. 1 to 5 in combination with the description of the above structural features:
the materials to be conveyed enter the shell 4 from the radial feed port 3, the shaftless propeller blades 5 arranged between the two circumferential bearing supporting mechanisms 2 at the left end and the right end rotate under the drive of the speed reducing motor 1, and the oblique blade surface spiral angle of the shaftless propeller blades 5 pushes the materials to axially displace and fall from the radial discharge port 7 to realize the material conveying.
The transmission shaft 8 transmits the power of the gear motor 1 to the circumferential bearing supporting mechanism 2 at the right end to drive the right end and the left end of the shaftless propeller blade 5 to synchronously rotate.
The small driving gear pair 10 on the output shaft of the motor drives the driving intermediate wheel 9, the driving intermediate wheel 9 drives the driving large gear 14 at the left end to rotate, the left end of the shaftless propeller blade 5 is fixed on the driving large gear 14 at the left end through the propeller connecting strip 12, and the driving large gear 14 is fixed on the inner ring of the large bearing 13 at the left end.
The transmission shaft 8 and the driving intermediate wheel 9 synchronously rotate to drive the driving intermediate wheel 18 on the right side, the driving intermediate wheel 18 drives the follow-up large gear 17 to rotate, the right end of the shaftless propeller blade 5 is fixed on the follow-up large gear 17 on the right side through a propeller connecting strip 16 on the right end, and the follow-up large gear 17 is fixed on the inner ring of a large bearing 15 on the right end. The bearing support, the fixation and the synchronous driving rotation of the double ends of the shaftless propeller blade 5 are realized. The double-end support of the shaftless propeller blade 5 eliminates the abrasion-resistant lining plate, so that the daily maintenance amount is small and the operation cost is low.
As shown in fig. 4, there are two types of shaftless screw conveyors in a multistage cascade manner. Fig. 4 (B) is a schematic diagram of a 3-stage cascade of a shaftless screw conveyor supported by a conventional intermediate bearing, wherein a single stage and a single stage are respectively a driving stage, a driving stage and a driving stage are respectively connected in series in a staggered manner, and radial feeding and discharging ports are integrally arranged in a stepped manner. Fig. 4 (a) is a schematic diagram of a 3-stage cascade of the shaftless screw conveyor supported by the outer circumferential bearing of the screw body of the present utility model, wherein each stage is divided into a driving stage and a following stage a and a following stage B, that is, only one driving stage is required to drag several following stages, the stages are concentrically and serially connected with the coaxial shell of the interstage rotating body, and the end face discharge port of the driving stage is concentrically and coaxially connected with the shell flange of the end face feed port connected with the following stages a and B. The excircle Zhou Shuangduan of the shaftless propeller blade 5 supports to realize multistage connection of the shell flanges, so that the coaxial material conveying efficiency is high, and the application range is wide.
As shown in figure 5, the single-stage vertical shaftless screw conveyor is used, and the shaftless screw paddles 5 and the feed inlet stirring rod 19 are both fixed on a driving gearwheel through screw connecting strips 12 in the same way as described above, and the driving gearwheel is driven to rotate by a driving motor 21. The material enters through the axial feed opening 20 and is entrained by the helical surface of the shaftless propeller blade 5 and pushed out of the axial discharge opening 22.
The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.
Claims (7)
1. A coaxial cascade shaftless screw conveyor comprising a plurality of single stage shaftless screw conveyors coaxially connected, wherein the single stage shaftless screw conveyor comprises:
a shaftless propeller blade rotatably disposed within the housing;
the circumference bearing supporting mechanism is fixed at two ends of the shell and comprises bearings which are arranged at two ends of the shell and are coaxially arranged with the shell, and connecting pieces which are fixedly connected with the inner rings of the bearings, and the outer diameter parts of the two ends of the shaftless screw propeller blade are fixed on the connecting pieces;
the driving mechanism is arranged at the bottom of the shell and is used for driving the connecting piece to rotate around the axis of the shell and driving the shaftless propeller blades to rotate, and the shaftless propeller blades push materials to axially move through blade inclined planes of the shaftless propeller blades to convey the materials.
2. The coaxial cascade shaftless screw conveyor of claim 1, wherein the connecting member comprises a gear coaxially provided with the bearing and fixed with an inner ring of the bearing, a screw connecting bar fixedly connected with the gear, and the other end of the screw connecting bar is fixed with an outer diameter portion of the shaftless screw blade.
3. The coaxial cascade shaftless screw conveyor of claim 2, wherein the number of screw connection bars is plural and uniformly distributed along the circumference of the shaftless screw paddles.
4. The coaxial cascade shaftless screw conveyor according to claim 2, wherein the driving mechanism comprises a gear motor, a driving pinion mounted on an output shaft of the gear motor, and a driven pinion engaged with the driving pinion, the driven pinion is mounted on a transmission shaft, a driving intermediate wheel coaxially arranged with the driven pinion is mounted on the transmission shaft, and the gear is engaged with the driving intermediate wheel.
5. The coaxial cascade shaftless screw conveyor of claim 1, wherein axial end caps are mounted at both ends of the housing.
6. The coaxial cascade shaftless screw conveyor according to claim 4, wherein the transmission shafts of two adjacent single-stage shaftless screw conveyors are connected by a coupling for driving the plurality of single-stage shaftless screw conveyors to synchronously rotate;
the shells of two adjacent single-stage shaftless screw conveyors are connected through cascade flanges.
7. The coaxial tandem shaftless screw conveyor of any of claims 1-6, wherein the coaxial tandem shaftless screw conveyor is arranged horizontally or vertically.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320944845.0U CN219708158U (en) | 2023-04-24 | 2023-04-24 | Coaxial cascade shaftless screw conveyor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320944845.0U CN219708158U (en) | 2023-04-24 | 2023-04-24 | Coaxial cascade shaftless screw conveyor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219708158U true CN219708158U (en) | 2023-09-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320944845.0U Active CN219708158U (en) | 2023-04-24 | 2023-04-24 | Coaxial cascade shaftless screw conveyor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219708158U (en) |
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2023
- 2023-04-24 CN CN202320944845.0U patent/CN219708158U/en active Active
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