CN113860120A - Retractable elevator system for lattice type large-scale wind turbine generator supporting structure - Google Patents
Retractable elevator system for lattice type large-scale wind turbine generator supporting structure Download PDFInfo
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- CN113860120A CN113860120A CN202111124407.1A CN202111124407A CN113860120A CN 113860120 A CN113860120 A CN 113860120A CN 202111124407 A CN202111124407 A CN 202111124407A CN 113860120 A CN113860120 A CN 113860120A
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- wind turbine
- guide steel
- lattice
- steel cable
- car
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B9/00—Kinds or types of lifts in, or associated with, buildings or other structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B1/00—Control systems of elevators in general
- B66B1/02—Control systems without regulation, i.e. without retroactive action
- B66B1/06—Control systems without regulation, i.e. without retroactive action electric
- B66B1/14—Control systems without regulation, i.e. without retroactive action electric with devices, e.g. push-buttons, for indirect control of movements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
- B66B11/04—Driving gear ; Details thereof, e.g. seals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B7/00—Other common features of elevators
- B66B7/02—Guideways; Guides
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Types And Forms Of Lifts (AREA)
Abstract
The invention provides a retractable elevator system for a lattice type large-scale wind turbine supporting structure, which comprises an elevator body used in a lattice type truss at the lower part of the lattice type large-scale wind turbine supporting structure; the elevator body comprises an electric control unit, a driving unit, a guide steel cable and a lift car; the electric control unit is connected with a driving unit, and the driving unit is in driving connection with the guide steel cable and the lift car; the number of the guide steel cables is two, and when the two guide steel cables are tensioned, the free ends of the two guide steel cables are connected with the ground; the car is in sliding connection with the guide steel cable; the driving unit and the guide steel cable are arranged in an inner cavity of an upper supporting tower cylinder of the lattice type large-scale wind turbine supporting structure; the invention effectively improves the safety, reduces the material cost and the field installation time, effectively isolates the corrosion of the external severe natural environment, and improves the service life and the reliability of the equipment.
Description
Technical Field
The invention relates to the technical field of wind power, in particular to a retractable elevator system for a lattice type large-scale wind turbine supporting structure.
Background
Wind power is the second largest renewable energy power generation source next to hydropower, and under the support of national clean energy transformation strategy, the scale of wind power development in China is rapidly developed, the wind power technology is continuously advanced, and onshore wind power has comprehensively entered the era of flat-price development. In order to further promote the generating capacity of the wind turbine and reduce the power consumption cost of wind power, the single machine capacity of the onshore wind turbine is continuously increased, and the hub height of the wind turbine is continuously increased. The upsizing of the units has caused the change of the supporting structure. The hub height of traditional land wind turbine generator system generally does not exceed 120 meters, adopts tower tube type bearing structure usually, and this kind of stable in structure adopts mill's prefabricated processing, and on-the-spot hoist and mount installation rate is fast, and because inside is hollow space, the necessary electric structure of wind turbine generator system and mechanisms such as artifical cat ladder, elevator can all arrange inside a tower section of thick bamboo, and the enclosure space of a tower section of thick bamboo has played fine guard action to these structures. However, after the wind turbine generator is developed to be higher and larger, the hub installation height of the onshore wind turbine generator can reach more than 150 meters, in order to meet the strength requirement of the supporting structure, a thicker tower barrel must be adopted at the bottom, the diameter of the tower barrel at the bottom is increased, unprecedented difficulty is increased for large transportation, and both roads and carriers cannot meet the requirement. The lattice type wind turbine supporting structure is an important direction for solving the difficult problem, lattice type truss supporting is adopted at the bottom of the large wind turbine supporting structure, the middle of the large wind turbine supporting structure is connected through a transition section, the upper portion of the large wind turbine supporting structure is supported by a traditional tower barrel, and the large piece transportation difficult problem is solved because the bottom truss structure can be split into small parts. However, the installation of the elevator of the lattice type wind turbine supporting structure is still a difficult problem, the traditional solution is to manufacture a fixed elevator stand, the elevator is installed on the elevator stand, the material consumption and the field construction amount are increased in the way, and all mechanical structures of the elevator are exposed to the outdoor environment, so that great threats are caused to the service life and the safety of the elevator, and further improvement is urgently needed.
Disclosure of Invention
The invention aims to provide a retractable elevator system for a lattice type large-scale wind turbine supporting structure, which solves the defects in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a retractable elevator system for a lattice type large-scale wind turbine supporting structure, which comprises an elevator body used in a lattice type truss at the lower part of the lattice type large-scale wind turbine supporting structure;
the elevator body comprises an electric control unit, a driving unit, a guide steel cable and a lift car; the electric control unit is connected with a driving unit, and the driving unit is in driving connection with the guide steel cable and the lift car;
the number of the guide steel cables is two, and when the two guide steel cables are tensioned, the free ends of the two guide steel cables are connected with the ground;
the car is in sliding connection with the guide steel cable;
the driving unit and the guide steel cable are arranged in an inner cavity of an upper supporting tower cylinder of the lattice type large-scale wind turbine supporting structure; the car is disposed in an inner cavity of the lower lattice truss.
Preferably, the electric control unit comprises a controller and three operation panels for operating the elevator, wherein the three operation panels are connected with the controller;
the controller is used for judging the start and stop of the driving unit according to the instruction transmitted by the operation panel.
Preferably, three operation panels are respectively installed at the bottom of the lower lattice truss, the inner wall of the car and the bottom of the upper supporting tower.
Preferably, a tower bottom control box is arranged at the bottom of the lower lattice truss, and the operation panel arranged at the bottom of the lower lattice truss is arranged in the tower bottom control box.
Preferably, the drive unit comprises an electric traction box, wherein the electric traction box is mounted in the inner cavity of the upper support tower; the electric dragging box is in driving connection with the guide steel cable; the electric traction box is in driving connection with the car through a traction main cable.
Preferably, the free end of the guide steel cable is further provided with an anchor hook, and the anchor hook is connected with an anchor base arranged on the ground in a hanging mode.
Preferably, an automatic door connected with the electronic control unit is arranged at the joint between the inner cavity of the upper supporting tower and the inner cavity of the lower lattice truss.
Preferably, the electric control unit is further connected with a limit protection unit for protecting the car.
Preferably, the limit protection unit comprises a position sensor and a torque sensor, wherein the position sensor is used for acquiring the position information of the car and transmitting the acquired position information to the electric control unit; the electric control unit is used for judging the opening of the electric door according to the received position information;
the torque sensor is used for collecting torque information of the guide steel cable and transmitting the collected torque information to the electric control unit; and the electric control unit is used for judging the working state of the lift car according to the received torque information.
Compared with the prior art, the invention has the beneficial effects that:
according to the retractable elevator system for the lattice type large-scale wind turbine generator supporting structure, the sliding rail of the elevator car is established by tensioning and guiding the steel cable, so that an elevator stand frame required to be installed in a traditional truss supporting structure elevator is omitted, and the material cost and the field installation time are reduced; the sliding rail is established by tensioning the two parallel guide steel cables, so that the situation that the lift car is influenced by external wind blowing when going up and down to generate fluttering and rotation can be effectively avoided, and the safety is improved; simultaneously, just release the key parts such as the guide steel cable of elevator and car at the during operation, when unmanned aerial vehicle needs about, above structure shrink to the inside closed of upper support tower section of thick bamboo and await the orders, reduced outside natural environment's exposure time, effectively isolated outside abominable natural environment erosion, improved the life and the reliability of equipment.
Drawings
Fig. 1 is a schematic view of a retractable elevator system to which the present invention relates.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the retractable elevator system for the lattice large-scale wind turbine supporting structure provided by the invention mainly comprises an electric control unit and a hardware device, wherein the hardware device mainly comprises an electric dragging box 1, a guiding steel cable 2, a traction main cable 3, an automatic door 4, a car 5, a counterweight iron 6, an anchor hook 7, an anchor point ring 8, an anchor base 9 and a tower bottom control box 10, wherein the electric dragging box 1 is installed on a support inside a tower drum supporting the upper part of the wind turbine, is a comprehensive power system of the elevator, and is electrically driven to take charge of retraction, tensioning and locking of the guiding steel cable 2 and the traction main cable 3.
The upper end of the guide steel cable 2 is connected with the electric dragging box 1, and the lower end of the guide steel cable is connected with the anchor hook 7; the guide wire ropes 2 are provided with two side by side, and two guide wire ropes are arranged corresponding to the anchor hooks 7.
A counterweight iron 6 is arranged above the joint between the guiding steel cable 2 and the anchor hook 7; the distance between the two guide steel cables 2 is a fixed value, preferably more than 0.5 m, the upper part of the guide steel cables is limited by two wire outlets of the electric traction box 1, the bottom end of the guide steel cables is fixed by a weight iron 6, and the two guide steel cables 2 are synchronously retracted and released under the driving of the electric traction box 1.
The upper end of the traction main cable 3 is connected with the electric traction box 1, and the lower end of the traction main cable is connected with the car 5.
The car 5 has two sets of cable grippers, and two sets of cable grippers embrace respectively on two guide steel cables 2, when the tensioning of guide steel cable 2, car 5 can slide from top to bottom on guide steel cable 2.
An anchor base 9 is arranged on the ground at the bottom of the wind turbine generator, two anchor point rings 8 are arranged on the anchor base 9, when the guide steel cable 2 is put down, a worker manually hangs the anchor hook 7 on the anchor point rings 8, and then the guide steel cable 2 is tensioned and locked through an electric control system.
An electric door 4 is arranged at the bottom of a tower cylinder supported at the upper part of the wind turbine generator, and the electric door 4 is used as an upper channel and a lower channel for guiding the steel cable 2 and the electric car 5 when being opened.
The bottom of the wind turbine generator supporting structure is provided with a tower bottom control box 10, and the opening and closing of the electric door 4, the winding and unwinding of the guide steel cable 2, the tensioning and the locking and the like can be operated through a panel of the tower bottom control box 10.
The tower bottom control box 10 is respectively connected with the electric door 4 and the electric dragging box 1 in a control way.
The tower bottom control box 10 has outdoor long-term protection capability, a control panel is locked, and personnel with authority can operate the tower bottom control box after the tower bottom control box is opened by a key.
The electric control unit of the elevator system mainly comprises a control logic, a limiting protection unit and an operator panel, wherein the control logic mainly comprises: opening and closing of the electric door 4, retraction, tensioning and locking of the guide steel cable 2, and up-down start and stop of the car 5; the limiting protection unit mainly comprises the following components: when the car 5 and the guide steel cable 2 are not at the retraction positions, the electric door 4 is not allowed to be closed, the retraction positions of the car 5 and the guide steel cable 2 are at the bottom position of the inner cavity of the tower cylinder supported at the upper part, and whether the car 5 and the guide steel cable 2 are at the retraction positions is automatically judged through a position sensor; when the guide steel cable 2 is not in a tensioned and locked state, the car 5 is not allowed to act, the tensioning of the guide steel cable 2 is executed by an electric dragging box connected with the guide steel cable, whether the guide steel cable 2 is tensioned or not is automatically judged by a torque sensor arranged in the electric dragging box, and after the tensioning is judged, the electric dragging box automatically locks the guide steel cable 2; when the car 5 is not in the retracted position, the guide wire rope 2 is not allowed to release the tension.
The operator panel has three terminals, which are respectively located inside the tower bottom control box 10, inside the car and on the platform at the bottom of the tower, and the operator panel mainly includes but is not limited to the following buttons: automatic door 4 opening and closing, guide cable 2 releasing tension and locking, guide cable 2 unlocking and tension, guide cable 2 retracting, car 5 up, car 5 down, car 5 one-key retracting. The operator can operate the elevator at these three locations via the operator panel.
The technical principle of the invention is as follows:
two guide steel cables 2 are released from the interior of the tower barrel at the upper half part of the supporting structure of the wind turbine generator, an anchor hook 7 and a counterweight iron 6 are arranged at the lower end of each guide steel cable 2, the counterweight iron 6 fixes the lower ends of the guide steel cables 2 together and keeps a certain distance, and the counterweight iron 6 can also ensure that the interference of wind power is reduced when the guide steel cables 2 are placed down. The guide wire rope 2 is tensioned after the anchor hook 7 is hooked on the anchor ring 8 of the ground, thereby constructing a slide rail of the car 5. The lift car 5 is released from the interior of the tower drum at the upper half part of the wind turbine supporting structure, and workers at the tower bottom can take the lift car 5 to move from the tower bottom to the upper part and the lower part of the tower drum platform at the upper half part of the wind turbine supporting structure.
The beneficial effects are that: the sliding rail of the elevator car is established by tensioning the guide steel cable, so that an elevator stand frame required to be installed in the traditional truss support structure elevator is omitted, and the material cost and the field installation time are reduced; the sliding rail is established by tensioning the two guide cables which are parallel, so that the situation that the lift car is influenced by external wind blowing when going up and down to generate drifting and rotation can be effectively avoided, and the safety is improved; the key parts such as the guide steel cable of elevator, traction main push-towing rope and car just release at the during operation, when unmanned aerial vehicle needs about, the tower section of thick bamboo internal seal that goes up the structure shrink to upper portion awaits the orders, has reduced outside natural environment's exposure time, has effectively isolated outside abominable natural environment and has corroded, has improved the life and the reliability of equipment.
Examples
The retractable elevator system for the lattice type large-scale wind turbine generator supporting structure provided by the embodiment has the advantages that the hub height of the lattice type large-scale wind turbine generator is 170m, the upper half part of the supporting structure is of a cylindrical steel tower cylinder structure, the height of the cylindrical steel tower cylinder structure is 80 m, the lower half part of the supporting structure is of a lattice type truss structure, and the height of the lattice type truss structure is 90 m.
The personnel rise to the cabin of the wind turbine generator from the ground and need to take two elevator systems continuously, the elevator systems of the upper portion support tower barrel and the elevator system of the lower portion lattice type truss are respectively, the personnel take the elevator system of the lower portion lattice type truss firstly and rise to the bottom platform of the upper portion support tower barrel, and then take the elevator system in the tower barrel and rise to the cabin. The elevator system of this example refers to an elevator system for a lower lattice truss.
The system mainly comprises an electric control unit and a hardware device, wherein the hardware device mainly comprises an electric dragging box 1, a guide steel cable 2, a traction main cable 3, an automatic door 4, a car 5, a counterweight iron 6, an anchor hook 7, an anchor point ring 8, an anchor base 9, a tower bottom control box 10 and the like. The electric traction box 1 is arranged on an inner support of an upper supporting tower barrel of the wind turbine generator, is a comprehensive power system of the elevator, and is electrically driven to take up, release and lock the guide steel cable 2 and the traction main cable 3. The upper end of the guide steel cable 2 is connected with the electric dragging box, the lower end of the guide steel cable is connected with the anchor hook 7, the guide steel cable 2 is provided with two side-by-side guide steel cables, and the number of the guide steel cables corresponds to that of the anchor hook 7. A balance weight 6 is arranged above the joint of the adjacent guide steel cable 2 and the anchor hook, the distance between the two guide steel cables is a fixed value, the set distance is more than 0.5 m, the upper part of the distance is limited by two wire outlets of the electric traction box 1, the bottom end of the distance is fixed by the balance weight, and the two guide steel cables are synchronously folded and unfolded under the driving of the electric traction box. The upper end of the traction main cable 3 is connected with the electric traction box 1, the lower end of the traction main cable is connected with the lift car 5, the lift car 5 is provided with two groups of cable holding devices which are respectively held on the two guide steel cables 2, and when the guide steel cables 2 are tensioned, the lift car 5 can slide up and down on the guide steel cables 2. An anchor base 9 is arranged on the ground at the bottom of the wind turbine generator, two anchor point rings 8 are arranged on the anchor base 9, when the guide steel cable is laid down, a worker manually hangs the anchor hooks 7 on the anchor point rings 8, and then the guide steel cable 2 is tensioned through an electric control system. An electric door 4 is arranged at the bottom of a tower cylinder supported at the upper part of the wind turbine generator, and the electric door 4 is used as an upper channel and a lower channel for guiding the steel cable 2 and the electric car 5 when being opened. The bottom of the wind turbine generator supporting structure is provided with a tower bottom control box 10, and the opening and closing of the electric door 4, the winding and unwinding of the guide steel cable 2, the tensioning and the like can be operated through a panel of the control box 10. The control box 1 has long-term outdoor protection capability, the control panel is locked, and the person with authority can operate the control box after the person is unlocked by a key.
The electric control unit of the elevator system mainly comprises control logic, limit protection, an operator panel and the like. Wherein the control logic mainly comprises: opening and closing of the electric door 4, retraction and tensioning of the guide steel cable 2, up-and-down opening and closing of the car 5 and the like. The limit protection mainly comprises the following steps: when the car 5 and the guide wire rope 2 are not in the retracted position, the electric door 4 is not allowed to be closed; when the guide wire rope 2 is not in a tensioned state, the car 5 is not allowed to act; when the car 5 is not in the retracted position, the guide wire rope 2 is not allowed to release the tension. The operator panel has three terminals, which are respectively located inside the tower bottom control box, inside the car and on the platform at the bottom of the tower. The operator can operate the elevator at these three locations via the operator panel.
The actual operation process mainly comprises three links: deployment of the elevator, riding of the elevator and retraction of the elevator.
1) The deployment of the elevator. When the staff of the wind turbine generator system arrives at the generator system and needs to carry out the operation of climbing the tower, open the control box 10 at the bottom of the tower through the key, utilize the control operator panel in the case to operate. The power door 4 is first opened and the hoistway is opened. Then the guiding steel cable 2 is released, the electric dragging box 1 releases the guiding steel cable 2 at a constant speed, and the bottom end of the guiding steel cable 2 gradually descends to the ground under the action of gravity. The two anchor hooks 7 are manually hooked on the two anchor shackle 8, and then the cable drag box is controlled to automatically tension and lock the guide wire rope 2. The elevator completes the deployment process.
2) Taking an elevator. Car release is controlled by an operator panel in the tower bottom control box 10. When the car descends to the ground, the worker enters the elevator car and then controls the car to move up and down through an operator panel in the car.
In the state that the elevator is completely unfolded, workers can select to use operator panels at different positions to control the elevator car according to the positions (the ground, the interior of the elevator car and the platform at the bottom of the tower barrel) where the workers are located.
3) And (6) retracting the elevator. When the worker finishes the operation and returns to the ground, the worker operates the tower through a control operator panel in the tower bottom control box 10. Firstly, retracting the lift car to enable the lift car to ascend to the top to a platform at the bottom of the tower;
then the tension of the guide wire rope 2 is released; thirdly, manually releasing the anchor hooks 7 on the anchor shackle 8; fourthly, retracting the guide steel cable 2 to the platform at the bottom of the tower, and fifthly, closing the electric door 4; and sixthly, locking the tower bottom control box 10.
Through the operation, the working personnel can get on and off the elevator with the lattice type tower support structure. The sliding rail of the elevator car is established by tensioning the guide steel cable, so that an elevator stand frame required to be installed in the traditional truss support structure elevator is omitted, and the material cost and the field installation time are reduced; the sliding rail is established by tensioning the two guide cables which are parallel, so that the drifting and rotation of the lift car caused by the influence of external wind power when the lift car moves up and down are effectively avoided, and the safety is improved; the key parts such as the guide steel cable of elevator, traction main push-towing rope and car just release at the during operation, when unmanned aerial vehicle needs about, the tower section of thick bamboo internal seal that goes up the structure shrink to upper portion awaits the orders, has reduced outside natural environment's exposure, has effectively completely cut off outside abominable natural environment and has corroded, has improved the life and the reliability of equipment.
Claims (9)
1. A retractable elevator system for a lattice type large-scale wind turbine generator supporting structure is characterized by comprising an elevator body used in a lattice type truss at the lower part of the lattice type large-scale wind turbine generator supporting structure;
the elevator body comprises an electric control unit, a driving unit, a guide steel cable (2) and a lift car (5); wherein the electric control unit is connected with a driving unit which is connected with a guide steel cable (2) and a lift car (5) in a driving way;
the number of the guide steel cables (2) is two, and when the two guide steel cables (2) are tensioned, the free ends of the two guide steel cables are connected with the ground;
the car (5) is connected with the guide steel cable (2) in a sliding manner;
the driving unit and the guide steel cable (2) are arranged in an inner cavity of an upper supporting tower cylinder of the lattice type large-scale wind turbine supporting structure.
2. A retractable elevator system for a lattice large wind turbine support structure according to claim 1, characterized in that the electrical control unit comprises a controller and operation panels for operating the elevator, wherein there are three operation panels, all connected with the controller;
the controller is used for judging the start and stop of the driving unit according to the instruction transmitted by the operation panel.
3. Retractable elevator system for lattice large wind turbine support structure according to claim 2, characterized by that three operation panels are installed at the bottom of the lower lattice truss, the inner wall of the car (5), the bottom of the upper support tower respectively.
4. Retractable elevator system for lattice large wind turbine support structure according to claim 3, characterized in that the bottom of the lower lattice truss is provided with a tower bottom control box (10), and the operation panel placed at the bottom of the lower lattice truss is placed in the tower bottom control box (10).
5. Retractable elevator system for lattice large wind turbine support structure according to claim 1, characterized by the fact that the drive unit comprises an electric traction box (1), wherein the electric traction box (1) is mounted in the inner cavity of the upper supporting tower; the electric dragging box (1) is in driving connection with the guide steel cable (2); the electric traction box (1) is in driving connection with the car (5) through the traction main cable (3).
6. Retractable elevator system for lattice large wind turbine support structure according to claim 1 characterized by that the free end of the guiding steel cable (2) is further provided with an anchor hook (7), the anchor hook (7) is in hanging connection with an anchor base (9) arranged on the ground.
7. Retractable elevator system for lattice large wind turbine support structure according to claim 1, characterized in that the junction between the inner cavity of the upper support tower and the inner cavity of the lower lattice truss is provided with an automatic door (4) connected with an electronic control unit.
8. A retractable elevator system for a lattice large wind turbine support structure according to claim 1, characterized in that the electronic control unit is further connected with a limit protection unit for protecting the car (5).
9. A retractable elevator system for a lattice large wind turbine supporting structure according to claim 8, characterized in that the limit protection unit comprises a position sensor and a torque sensor, wherein the position sensor is used for collecting the position information of the car (5) and transmitting the collected position information to the electronic control unit; the electric control unit is used for judging the opening of the electric door (4) according to the received position information;
the torque sensor is used for acquiring torque information of the guide steel cable (2) and transmitting the acquired torque information to the electric control unit; the electric control unit is used for judging the working state of the lift car (5) according to the received torque information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111124407.1A CN113860120A (en) | 2021-09-24 | 2021-09-24 | Retractable elevator system for lattice type large-scale wind turbine generator supporting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111124407.1A CN113860120A (en) | 2021-09-24 | 2021-09-24 | Retractable elevator system for lattice type large-scale wind turbine generator supporting structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113860120A true CN113860120A (en) | 2021-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111124407.1A Pending CN113860120A (en) | 2021-09-24 | 2021-09-24 | Retractable elevator system for lattice type large-scale wind turbine generator supporting structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113860120A (en) |
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2021
- 2021-09-24 CN CN202111124407.1A patent/CN113860120A/en active Pending
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